gujarat state electricity corporation ltd. office/kutch lignite power... · of 190 m high rcc...
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Phone: 91-2839-262452 / 264423. Fax: 91-2839-262431 / 264434.
Email: [email protected]. Website: www.gsecl.in
CIN: U40100GJ1993SGC019988
GUJA RA T STA TE ELECTRI CI TY CORP ORA TI ON LI M I TED
KACHCHH LIGNITE THERMAL POWER STATION
PANANDHRO, PO: S.K. VARMANAGAR, TALUKA LAKHPAT, KACHCHH, GUJARAT (INDIA)PANANDHRO, PO: S.K. VARMANAGAR, TALUKA LAKHPAT, KACHCHH, GUJARAT (INDIA)PANANDHRO, PO: S.K. VARMANAGAR, TALUKA LAKHPAT, KACHCHH, GUJARAT (INDIA)PANANDHRO, PO: S.K. VARMANAGAR, TALUKA LAKHPAT, KACHCHH, GUJARAT (INDIA)
GUJARAT STATE ELECTRICITY CORPORATION LTD.
KUTCH LIGNITE THERMAL POWER STATION, SKVNAGAR, TAL.: LAKHPAT, KUTCH-
370601
E-TENDER FOR THE WORK OF
Design, Engineering and Turnkey Execution for Construction of 190 M High RCC
Chimney, Flue Duct and related work to suit 190 M Chimney at KLTPS, Panandhro,
Gujarat
GUJARAT STATE ELECTRICITY CORPORATION LTD.
KUTCH LIGNITE THERMAL POWER STATION, SKVNAGAR, TAL.: LAKHPAT, KUTCH-370601 Design, Engineering and Turnkey Execution for Construction of 190 M High RCC Chimney, Flue Duct and
related work to suit 190 M Chimney at KLTPS, Panandhro, Gujarat
Table of Contents Page 2 of 169
TABLE OF CONTENTS
TENDER NOTICE ........................................................................................................................................... 3
INSTRUCTIONS TO BIDDERS ......................................................................................................................... 6
QUALIFICATION CRITERIA .......................................................................................................................... 12
FORMS AND AGREEMENT .......................................................................................................................... 13
SCOPE OF WORK ...................................................................................................................................... 342
GENERAL RULES AND DIRECTIONS FOR THE GUIDENCE OF CONTRACTOR ............................................... 48
TENDER AND CONTRACT FOR WORKS ....................................................................................................... 50
CONDITIONS OF CONTRACT ....................................................................................................................... 53
SPECIAL CONDITIONS OF CONTRACT ......................................................................................................... 66
GENERAL CONDITIONS OF CONTRACT....................................................................................................... 67
TECHINICAL SPECIFICATIONS ................................................................................................................... 786
TABLE OF CONTENTS (EXECUTION AND QUALITY CONTROL).................................................................. 101
GUJARAT STATE ELECTRICITY CORPORATION LTD.
KUTCH LIGNITE THEMAL POWER STATION, SKVNAGAR, TAL.: LAKHPAT, KUTCH-370601 Web site: www.gseb.com E-mail: [email protected]
Phone no:
02839–262452
Fax No:
02839–262431
169169169Signature of
Contractor
Tender Notice Page 3 of 169
TENDER NOTICE
TENDER NOTICE NO: KLTPS/-78 / CEG / 2014-15 / WE-536(RFQ-29147)
Chief Engineer (G) KLTPS invites “On-line Tenders” (e-tendering) for the work of “Design, Engineering
and Turnkey Execution for Construction of 190 M High RCC Chimney, Flue Duct and related work to
suit 190 M Chimney at KLTPS, Panandhro, Gujarat” from experienced Contractors/Engineering firms
who have executed works of similar nature and magnitude successfully. The tender details are listed
below:
Tender Papers & Specifications may be downloaded from Web site http://gsecl.nprocure.com (For view,
down load and on line submission) and GUVNL/GSECL web sites www.gseb.com & www.gsecl.in(For
view & down load only).Tender fee may be paid along with submission of tender in EMD cover, for
respective tender. All the relevant document of tenders to be submitted physically will be received only
by Registered Post A.D. or Speed Post addressed to “CHIEF ENGINEER (G), GUJARAT STATE ELECTRICITY
CORPORATION LTD, Kutch Lignite Thermal Power Station, SKVnagar, Ta. Lakhpat, Dist. Kutch.”
All the bidders should have valid e-tender vender registration. Further bidder should be registered in
class “AA” or above with Government/ semi-government as per tender conditions. Otherwise their bids
will not be considered eligible for technical scrutiny and as such, their technical bids will not be
opened& price bid will not be considered.
1.0 Pre-bid meeting at Gujarat State Electricity Corporation Limited, C.O.
Office, Vadodara.
27/06/2014
2.0 Last date of submission of tender on-line (e-tendering) Technical as
well as Price bid along with soft copy of all other documents as stated
hereunder, up to 16.30 hrs.(This is mandatory)
09/07/2014
3.0 Last date of physical submission of all relevant documents as stated
hereunder along with DD of EMD and Tender Fee by RPAD/ Speed
Post up to 16.30 hrs.
11/07/2014
Name of Work : Design, Engineering and Turnkey Execution for Construction of 190 M High
RCC Chimney, Flue duct and related work to suit 190 M Chimney at KLTPS,
Panandhro, Gujarat.
Estimated Cost : Rs. 10,30,00,000 (Rs. Ten Crores and Thirty Lakhs only)
Date of Pre-bid
discussions
: 27.06.2014
Time Limit : 24 (Twenty Four) Calendar Months from date of placement of order.
Tender Fee : Rs. 15,000.00 (Rs. Fifteen Thousand Only) (Non-Refundable)
E.M.D. : Rs. 10,30,000.00 (Rs. Ten Lakhs and Thirty Thousand Only)
Security Deposit : 5 % of Contract Value
GUJARAT STATE ELECTRICITY CORPORATION LTD.
KUTCH LIGNITE THEMAL POWER STATION, SKVNAGAR, TAL.: LAKHPAT, KUTCH-370601 Web site: www.gseb.com E-mail: [email protected]
Phone no:
02839–262452
Fax No:
02839–262431
169169169Signature of
Contractor
Tender Notice Page 4 of 169
4.0 Date of opening of Technical bid at 16.30 hrs. 11/07/2014
5.0 Tentative date of on line opening of price bid at 16.30 hrs. (if
possible)
14/07/2014
6.0 Validity of Tender 180 Days from opening of
technical bid
IMPORTANT:
A. Only following listed documents must be submitted on line as well as physically (Excluding price bid)
along with the D.D. of Tender Fee, EMD in sealed cover on OR before due date and time.
1) Demand Draft for EMD
2) Demand Draft for Tender fee
3) Attested copy of Registration Certificates under appropriate class as stated in tender notice
4) Attested copy of document showing “Provident Fund” Number in Company’s name obtained by the
bidder
5) Attested copy of Proprietorship or Partnership Deed
6) Attested copy of Power of Attorney, if any for signing the bid documents
7) Attested copy of Balance Sheet with Profit & Loss account of last 3 financial years duly audited by
Chartered Accountant.
8) Attested copy of latest Solvency Certificate.
9) Attested copy of work experience certificate for the similar nature & magnitude of works executed
as per qualification criteria.
10) List of works in progress
11) Details of equipment, tools & plants immediately available with the bidder for use of this work
12) Details of technical personnel
13) PAN Number and copy of PAN for TDS
14) Undertaking duly Notarized as per attached Declaration Form
15) Any other documents required to verify technical, financial capability of the bidders & other
credentials
16) All such documents should be strictly submitted by RPAD / speed post only. Otherwise the offer will
not be considered and no any further communication in the matter will be entertained.
B. Bidder has to submit their queries / clarifications to be discussed during pre-bid meeting 10 days
before the Pre-bid meeting to C.E[G] KLTPS and ACE[CIVIL] by Email. [ [email protected] ;
C. After Pre-Bid meeting all the bidders will be put at par. No technical / commercial deviation will
be allowed thereafter.
D. Any deviation found in Data/Details/Documents between on line offer (e-tendering) and physically
submitted documents (Tender document fee, bidder) offer of the same bidder will not be
considered and no any further communication in the matter will be entertained.
E. Further bidders are requested to submit price – bid i.e. Schedule-B on line only and not to submit
the price bid in physical form. This is mandatory. If price bid is submitted in physical form, same will
GUJARAT STATE ELECTRICITY CORPORATION LTD.
KUTCH LIGNITE THEMAL POWER STATION, SKVNAGAR, TAL.: LAKHPAT, KUTCH-370601 Web site: www.gseb.com E-mail: [email protected]
Phone no:
02839–262452
Fax No:
02839–262431
169169169Signature of
Contractor
Tender Notice Page 5 of 169
not be opened and only on-line submitted price will be considered for evaluation. The bidder is
requested not to submit the hard copy of downloaded tender document, condition of the contract,
specification & other relevant documents, except documents as stated here above. Instead of the
same, the bidder shall submit the duly Notarized Undertaking as stated below declaration form on
the stamp paper of Rs.100/-.
F. It is mandatory for all the bidders to submit their tender documents by online (e-tendering ) within
the scheduled time. Tender documents submitted in only physical form will not be accepted and
considered. Also, all bidders shall submit required Physical documents as stated in Tender notice.
G. GSECL reserves right to reject any OR all tenders without assigning any reasons thereof.
Chief Engineer (G)
GSECL, KLTPS
DECLARATION FORM (To be submitted duly notarized on Rs 100/- Stamp paper) (1) I/We hereby declare that I/We have carefully studied the entire tender placed on the WEB site and condition of the contract, specification & other relevant documents of this work mentioned in the tender and abide by the same. Also I/We hereby and agree to execute the same accordingly. (2) I/We hereby abide to execute the contract agreement by downloading the copies of the condition of the contract, specification & other relevant documents of this work or otherwise I/We will get copy of the same form the office of the tender inviting authority and the same will be acceptable to me /us. I/We hereby accept and confirm that any dispute on this regards shall not be entertained by the tender inviting authority. (3) I/We hereby declare that I/we have visited the work site and fully acquainted myself/ourselves with the local situation regarding materials, labor and other factors pertaining to the work before submitting this tender. (4) I/We hereby confirm that our offer is Un-conditional and without any technical & commercial deviations. Signature of Contractor, Names, Seal, detail address With Phone/Fax. & company’s round seal
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Instructions to Bidders Page 6 of 169
INSTRUCTIONS TO BIDDERS
E-tenders are hereby invited for work of “Design, Engineering and Turnkey Execution for Construction
of 190 M High RCC Chimney, Flue Duct and related work to suit 190 M Chimney at KLTPS, Panandhro,
Gujarat” for Gujarat State Electricity Corporation Ltd. (herein after referred to as GSECL). The project is
located in Kutch District in the state of Gujarat.
1.0 The work shall be carried out according to the enclosed General Conditions, other conditions,
Technical Specifications etc. & such of the working drawings approved by the GSECL.
2.0 Tenders must be submitted in the enclosed schedule of work & quantities. Those received in any
other form will not be accepted. They should be accompanied by a covering letter in which the
bidder should give all information as called for in the specifications & any other point which he
would like to be considered along with the tender.
3.0 Earnest Money Deposit (EMD)
3.1 Bidders are requested to pay an earnest money deposit by demand draft or by Bank
Guarantee.
Guarantees issued by following banks will be accepted as SD/EMD on permanent basis.
1. All Nationalized Banks including the Public Sector Bank IDBI Ltd.
2. Private Sector Banks authorized by RBI to undertake State Government Business
(at present - Axis bank, ICICI bank and HDFC bank)
Guarantees issued by following banks will be accepted as SD/EMD for period up to March 31, 2015.The
validity cut-off date in GR is with respect to date of issue of Bank Guarantee irrespective of date of
termination of Bank Guarantee.
1. Commercial Banks
1. Kotak Mahindra Bank
2. Yes Bank
3. IndusInd Bank
4. Ratnakar Bank.
5. Karur Vyasa Bank
6. DCB Bank
7. ING Vyasa Bank
2. Co-operative Banks of Gujarat
1. The Kalupur Commercial Co-operative Bank Ltd.
2. Rajkot Nagarik Sahakari Bank Ltd.
3. The Ahmedabad Mercantile Co-operative Bank Ltd.
4. The Mehsana Urban Co-Operative Bank Ltd.
5. Nutan Nagrik Sahakari Bank Ltd.
Payment of EMD in form of Cheque shall not be accepted.
3.2 The EMD shall be submitted along with submission of Technical bid only . Tenders not
accompanied by EMD shall be rejected as non-responsive.
3.3 If during the tender validity period, i.e. 180 days, the bidder withdraws his tender, the
EMD shall be forfeited and the bidder may be disqualified from tendering for further
works.
3.4 The EMD will be returned promptly to the unsuccessful bidder. The EMD will be returned
to the successful bidder after he furnishes the Security Deposit for performance and duly
enters in to the contract. If he fails to furnish the SD or to execute the contract for the
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Instructions to Bidders Page 7 of 169
work offered to him, his EMD shall be forfeited and the bidder may be disqualified from
tendering for further work.
4.0 Bids are invited under a Single Stage – Two bid procedure. This will also include the process of
qualification of the bidders. Bidders are to submit simultaneously, technical bid both online &
physical as per the given schedule. However, price bid will be submitted only by online & if price
bid will be submitted physically the same will not be opened & will not be considered. Proposal
including bidder’s data on his technical and financial strengths along with experience profile to
meet with post qualification criteria and Bidder’s Technical proposals containing work methods,
approach, construction programme etc. will be submitted by the bidder both online & physical.
The Technical Proposal along with the data and information for qualification will be opened first.
The technical proposal along with qualification information will be subjected to an evaluation
process contained as a part of the tender document and bidders those who found fit to qualify
will be invited for opening of the price bid. GSECL as an employer reserves its absolute and
unchallengeable right to qualify or disqualify one or all bidders by following an objective and
transparent system. The envelope containing the post qualification data and the technical bid will
be opened first for post qualification of the bidders and evaluation of their technical proposals
and to determine the responsiveness of the bids. Price bids of only those contractors who are
declared as substantial responsive to the requirements of the bid documents will be opened only
online for further evaluation.
Qualification requirement specifying financial capacity, technical, minimum acceptable levels with
regards to bidders experience in relevant projects and other relevant factors, such as work in
hand, future commitments and litigation history etc. will be evaluated first, and those qualifying
the criteria will be considered for further price evaluation. Technical proposal, which are not
substantially responsive will be rejected.
5.0 The price proposals will be opened online only as per the schedule, after conclusion of the
Technical Evaluation and Post Qualification process.
6.0 Schedules for tools & tackles, equipment, personnel details etc., and all other necessary details
shall also be submitted, in Envelope – I, i.e. Technical Bid. Tenders will be opened on the day &
time indicated in the tender notice in the presence of such bidders who wish to remain present.
7.0 The bidders shall note that no deviations from the technical specifications or commercial
conditions with this bid are acceptable & it will be presumed that the bidder agrees entirely with
the specifications & General terms & conditions of the contract.
8.0 The tenders received after time and date specified in the tender notice, will not be accepted.
Once the offer submitted by the contractor before due date of submission, the contractor will not
be allowed to submit revised / additional / modified / other offer even before due date. However,
if the issue and receipt of tender is extended by the GSECL due to any reason, the contractor may
submit the revised offer before due date of submission, if he wish to submit.
9.0 The work shall be completed within the period stipulated in the contract. However it may be
noted that drawings shall be released progressively & site clearance arranged accordingly to the
progress of work at site. Therefore the contractor has to organize & coordinate the works to suit
these. In the event of any delay due to the above or due to any other reason not attributable to
the contractor, reasonable extension in the completing the work may be given at the discretion &
as decided by the GSECL but no compensation or idle charges will be paid to the contractor under
any circumstances.
10.0 The GSECL reserves the right to accept any tender irrespective of whether it is lowest or not or to
reject all the tenders without assigning any reasons thereof. Tenders departing from the technical
Specification or the method of bidding in a radical manner may also be rejected.
11.0 The bidders shall be presumed to have carefully examined the drawings, conditions &
specifications of the work & to have acquainted themselves with all the details of the existing site
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Instructions to Bidders Page 8 of 169
conditions, locations, materials, geological & weather conditions/characteristics, labour
conditions & in general necessary information & data etc. pertaining to & need of the work.
12.0 On acceptance of the tender the name(s) of the accredited representative(s) of the bidder who
would be responsible for taking instructions from the Engineers of the GSECL shall be
communicated to the Chief Engineer (Gen), Gujarat State Electricity Corporation Ltd, KLTPS,
Panandhro.
13.0 All royalties, sales tax, toll tax, local tax, development charges, VAT tax, & any other taxes
including Works Contract taxes etc. in respect of this contract shall be payable by the contractor
& Gujarat State Electricity Corporation Ltd will not entertain any claims whatsoever in this aspect.
Any statutory variation in future towards the above mentioned taxes that shall also be payable by
the contractor & Gujarat State Electricity Corporation Ltd shall not entertain any claim of
whatsoever nature, during or after the completion of this tendered work. Proof of such payments
made by the Contractor to the appropriate departments shall be produced to Gujarat State
Electricity Corporation Ltd failing which appropriate amount shall be withheld on getting
information / instruction from the concerned departments.
The rates are “Excluding the service tax”. Service tax will be paid separately to the contractor as
per prevailing rules from time to time.
14.0 This specification is intended as a general description of quality envisaged for materials &
workmanship & of the finished work. It is not intended to cover minute details. The work shall be
executed in accordance with the best modern practice & to the complete satisfaction of the
GSECL. Special techniques approved by the GSECL shall be used if & where found necessary
without any extra claim. This specification shall have precedence if anything contrary to this is
stated elsewhere in the contract documents, the GSECL’s decision shall be final & binding to the
contractor on any issue arising out of such discrepancies.
15.0 The price bid submitted online by bidders should be without any deviation in commercial as well
as in the technical specification of the work.
16.0 The successful contractor will have to sign an agreement as per the GSECL’s rules on stamped
paper & the necessary stamp duty charges shall be borne by the contractor.
17.0 The bidder shall carefully study the work to be carried at different elevations & shall take into
account & consider all factors, method of demolition as well as construction, sequence of all
activities, site situation location all conditions etc. & shall consider for all such
information/data/Conditions in the rates quoted. The GSECL will not pay any extra rate for any
reason in case the contractor claims, after acceptance of contract, to have misjudged the site
condition.
18.0 The price quoted shall include cost towards all materials, & machinery including equipment,
fixtures, labour, constructional equipment, scaffolding, staging, ramps, walkways, approach and
haul road, temporary works, etc. bearing permanent or temporary nature necessary for the
completion of the work in all respects, except for those items specifically mentioned to be issued
by the GSECL. The contractor must also arrange for the transport of materials & include all such
costs in the rates quoted by him for finished work.
19.0 The Quoted % above or below shall be written both in words, & figures & the units in words. If
any discrepancy occurs between words & figures, then words shall prevail. The tender documents
shall be written legibly & free from erasure, overwriting or conversions of figures, crossing out,
initializing, dating & rewriting.
20.0 During the execution of the work if it is found that the work is not progressing as per the
Scheduled Progress Programmed, approved by the GSECL & planned by the Contractor, due to
the reasons attributable to the Contractor suitable action shall be taken as per ClauseNo.3, 4 and
other relevant clauses appearing in the section of ``Tender & Contract for Works’’ of tender
document. And GSECL may also take such action as it may deem fit to ensure that the work is
completed in time at risk and cost of the contractor.
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Instructions to Bidders Page 9 of 169
21.0 The contract or any part thereof shall not be subject to change without the written permission of
the Chief Engineer (G), Gujarat State Electricity Corporation Ltd, Kachchh Lignite Thermal Power
Station, Panandhro, Kutch or his authorized representatives.
22.0 The bidders should note that the completion of above mentioned works in all respect in
accordance with the time limit given is very important and should be strictly adhered to. The
work is to be completed in time limit from the date of issue of written order to commence the
work by the Chief Engineer (G) , KLTPS
a. The bids should be valid for a minimum period of 180 days from the date of opening of technical
bid. During this period tenderer shall not be allowed to withdraw their tender and if withdrawn,
the Earnest Money Deposit submitted with the tender will be forfeited.
b. L1 bidder has to pay Security deposit within 10 days from the date of issue of L.O.I.
c. After lapse of 10 days, if successful bidder not paying SD then, RPAD notice will be issued to the
successful bidder mentioning that on failing to pay security deposit within next 07 days from the
date of issue of RPAD Notice the EMD will be forfeited.
However, Tender inviting authority at his discretion may decide and prolong the time period for
paying of the Security Deposit as per the urgency of the work.
d. in case when successful bidder not at all responding within notice period or withdraws his offer
then his EMD shall be forfeited and he will not be allowed to participate in the tenders invited
from this office for the period of One year.
23.0 Further information required, if any, can be had from the office of the Chief Engineer (G), Gujarat
State Electricity Corporation Ltd, KLTPS, during working hours. But it must be clearly understood
that the tenders must be received complete in every respects by the due date & time.
24.0 GSECL cannot provide quarter facility for residence to contractor. If however there are any
surplus quarters available after meeting the requirements of GSECL’s staff, then GSECL will
consider allotting of quarters on rent as per the GSECL’s rules.
25.0 The contractor will have to make their own arrangement of water for construction work as well as
for their labourers at his own cost.
26.0 Work carried under this contract shall be completed in all respects within 24 (Twenty Four)
calendar months from the date of issue of letter of order to commence the work. However,
interim mile stones of the work will have to be completed as per the priority, sequence, schedule
given by GSECL time to time.
27.0 Bidders must quote firm price only, till completion of work under contract, & this is to be
confirmed by bidder while submitting his offer.
28.0 No escalation towards labour and material / fuel shall be paid in this execution of contract. Price
quoted shall be firm. Contractor shall pay minimum wages to his labourers as per the Minimum
Wages Act, 448 & rules there under as applicable from time to time in pursuant to the State
Government notification. The concerned contractor shall submit the details of the payment with
due certificate of LWO/IRO of the GSECL.
29.0 Each bidder shall also submit a Declaration to the effect that bidder is an engineering
construction firm or an association of firm which has successfully carried out large works of this
nature & has adequate organization & experienced personnel to handle this type &magnitude of
work. Information should be also given regarding the constitution of the firm; it’s authorized,
subscribed & paid up capital, the date & place of registration, the place of business, the names of
the directors & other relevant information.
30.0 In the case of non-Indian firms the declaration should also include an undertaking to the firm
registered, within three months of the date of notice of the acceptance of the tender.
31.0 Failure to so, as required in above clauses, in registering the firm after due notice, the tender
acceptance is liable to result in the annulment of the tender with forfeiture of the earnest money
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Instructions to Bidders Page 10 of 169
deposit & other penalties that may be applicable under the conditions specified intender &
contract documents.
32.0 Each tender shall contain the name, residence & place of business of person or persons making
the tender & shall be signed by the bidder with his usual signature with seal of the company.
33.0 An attested copy of the constitution of the firm with the name of partners shall be furnished.
Whenever, whether in submission of the tender or later in other matters, the signatures are
made by one person on behalf of Directors or a firm or a corporation, an attested copy of the
resolution of the partners or of law shall be supplied by the bidder authorizing Witnesses &
sureties shall be persons of status & probity, &their names, occupation & address shall be stated
below their signatures. All signatures shall be dated.
34.0 Tenders by corporation shall be signed with the legal name of the corporation followed by the
name of the state of incorporation & by the signature & designation of the president, secretary or
other person authorized to bind it in the matter with rubber seal of the company.
35.0 GSECL reserves the right to delete any item of Schedule-B for which contractor shall not have any
right to claim on this account.
36.0 The contractor shall carry out whole work without affecting the plant activities and power
generation. The contractor shall carry out the whole work in such a way that plant operation,
maintenance, vehicular movements and other construction activities/ works are affected.
37.0 The Contractor shall prepare all required roads, including haul roads ramps, turning points
diversion of drains, trenches, nallas, conduits, pipes, cables etc. to execute various items of this
Contract & arrange all transport of materials & all such costs shall be taken care of while quoting
the rates. No extra payments shall be admissible towards such costs. On completion, this shall be
cleared if asked by GSECL at no extra cost.
38.0 No idle charges shall be entertained by Gujarat State Electricity Corporation Ltd for any site
conditions or any circumstances.
39.0 The Contractor shall take all requisite & necessary care to observe that no damage is caused to
the Existing structures, assets etc. For any damage to the Existing Structures, assets of Gujarat
State Electricity Corporation Ltd, the Contractor shall be held responsible, and he will have to
rectify/restore/replace the damage immediately up to the satisfaction of Engineer-In-Charge, at
his own cost.
40.0 The Bidders shall note:
40.1 Lump sum price quoted shall cater for the cost of all materials & labour including all leads
& lifts, tools, plants, consumables such as but not limited to fuels, lubricants, etc. cost due
to mobilizing /demobilizing, temporary / permanent constructions.
40.2 Lump sum price quoted shall include for the details of constructions, which are obviously
& fairly intended & which may not have been specifically referred to in these documents
but are essential for the satisfactory completion of the work.
40.3 No price escalation on any account, will be payable.
40.4 GSECL will not pay any type of Advanced including Mobilisation Advance
41.0 Tenders who do not fulfil all the above conditions & those specified in the documents attached
with this contract document or incomplete in any respect are liable to rejection.
42.0 The contractor shall have a separate Provident Fund Code of RPFC in the name of company. The
contractor who does not possess such separate P.F. code shall not be considered for acceptance
of tender. The contractor has to submit such certificate showing P.F. code along with tender.
43.0 Effect and validity of Bid: The submission of any bid connected with these documents and
specification shall constitute an agreement that bidder shall have no cause of action or claim
against the owner for rejection of his bid. The GSECL shall always be at liberty to reject or accept,
split any bid or bids at his sole discretion and any action will not be called into question and the
bidder shall have no claim in that regards against the owner.
44.0 SITE VISIT:
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Instructions to Bidders Page 11 of 169
The bidder is advised to visit the site and examine the site conditions and the areas where-in the
work is proposed to be carried out and to get his acquainted himself on his own responsibility for
all information that may be necessary for quoting the tender bid and entering in to contract. All
cash and liabilities arising out of the site visit shall be at bidder account.
45.0 RECOVERIES
45.1 In case of any damage to equipment/machinery or structure/building of GSECL or any public
property due to negligence’s of contractor or any other reasons attributed to contractor the
decision of Engineer-In-Charge regarding the amount of recovery shall be final.
45.2 If the contractor fails to execute the work as per direction of Engineer-In-Charge within the time
frame given by GSECL, the Engineer-In-Charge shall get the work done through any other
contractor at the risk and cost of the contractor and the cost of execution of such work along
with 15 % overhead charges shall be deducted from contractor monthly bill over and above
recovery as per rules.
46.0 The notice inviting tender, general instruction to bidders and all other documents of this tender
shall form part of the contract.
47.0 ACCEPTANCE OR REJECTION OF BID
47.1 The GSECL reserves the right to accept any tender irrespective of whether it is lowest or
not or to reject all the tenders without assigning any reasons thereof. Tenders departing
from the stipulated technical specifications, commercial conditions or the method of
bidding in a radical manner are liable to be rejected.
47.2 The bid is liable for rejection prima facie, if it is:
1) Without payment of EMD and/or Tender Fee.
2) Not in prescribed form.
3) Not bearing signature of the bidder & seal of the company on all the documents
accompanying the tender as mentioned in tender notice.
4) Not confirming to specifications or conditional tender.
5) Received after expiry of the due date & time.
6) Received by telex or telegram or fax.
7) Submitted by bidders who are listed under declaration of ineligibility for corrupt or
fraudulent practices issued by GSECL, Government of Gujarat or its Public Sector under
taking.
Tenders not fulfilling all the above conditions and those specified in the documents
attached or incomplete in any respect are liable to rejection.
48.0 R. A. BILL: One measured R.A. Bill shall be made every month on submission of bill by the
contractor in GSECL's prescribed format. No Ad-hoc payment will be made.
Chief Engineer (G)
GSECL, KLTPS
I/We accept the above conditions…
Contractor’s Representative legible
signature:_______________________________________________________
Name of the
person:______________________________________________________________________________
______
Seal of the Company________________________________ Date & place:
____________________________________
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Forms And Agreement Page 12 of 169
QUALIFICATION CRITERIA
The tender documents are of two separate bids i.e. technical and price bids. Bidders are requested to
submit the technical bid with the following credentials for post-qualification, both online as well as
physical as per schedule.
1) Experience Certificate:
Contractor should produce evidence of having experience on his own firm of successfully similar
completed works (A) One similar completed work costing not less than the amount equal to 80 % of
the estimated cost or (B) Two similar completed works each costing not less than the amount equal
to 50 % of the estimated cost or (C) Three similar completed works each costing not less than the
amount equal to 40 % of the estimated cost, during the last seven years in Govt. /Semi Govt./ GSECL
/GETCO / DISCOMS / GEB/Large Corporate Companies (like TATA/ADANI/RELIANCE) along with
certified copies of documentary evidence, preferably photo copy of orders secured from GSECL
/GETCO / DISCOMS / GEB / Government/Semi- Government, Large Corporate Companies (like
TATA/ADANI/RELIANCE) and satisfactory completion certificate from respective department
thereof. The GSECL may verify the above certificates / documents from respective department, if
necessary. Joint Ventures will not be allowed.
Similar works means Design and Construction of RCC Brick lined Chimney and associated
structures, foundations, etc. having height not less than 110.0 Meter above Ground Level.
The experience certificate from Private Individuals for whom the work is executed/ being executed
shall not be acceptable.
Without the experience certificate of sufficient magnitude and of similar in nature the offer is liable
to be rejected.
In absence of the work completion certificates from the Concerned Authority, the details of
experience submitted shall not be considered.
2 ) Latest bank solvency certificate of from any Nationalized Bank, Public Sector Banks, or IDBI
Bank / AXIS Bank / HDFC Bank / ICICI Bank / The Kalupur Commercial Co-operative Bank Ltd.
for a sum of Minimum 20 % of estimated cost, of this wok, not more than 12 months old.
3) Separate provident fund code number towards registration of your firm with Regional P.F.
Commissioner.
4) Contractor should submit evidence as a register contractor in appropriate class with Government/
Semi. Government i.e. Class “AA” and above or any such registration allowed to work for amount more
than Rs. 7.00 Crores working with, erstwhile GEB / GSECL/GETCO / DISCOM / Central / State
Government / Semi Government. Further bidder should also have valid E-tender Registration.
1) EMD & Tender fee as described in the tender document.
2) The price bid of only qualified bidders will be opened on line only. GSECL may verify the documents,
experience certificates from authority who have issued such certificates / details.
Chief Engineer (G)
GSECL, KLTPS
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Forms And Agreement Page 13 of 169
FORMS AND AGREEMENT
FORM-A: DETAILS OF STRUCTURE & ORGANIZATION. .......................................................................... 14
FORM-B: DETAILS OF PERSONNEL. ........................................................................................................ 15
FORM-C: DETAILS OF MACHINERIES & EQUIPMENT ............................................................................. 16
FORM - D1: DETAILS OF EXPERIENCE OF COMPLETED WORKS ............................................................. 17
FORM-D2: DETAILS OF EXPERIENCE OF ONGOING SIMILAR WORK. ..................................................... 18
FORM - E: DETAILS OF FINANCIAL CAPABILITY ...................................................................................... 19
FORM - F: ADDITIONAL INFORMATION ................................................................................................. 21
STATEMENT-S2: STATEMENT SHOWING THE DETAILS OF EXPERIENCE IN EXECUTION OF PWD OR
LARGE CIVIL ENGINEERING WORKS (LAKHS RS.) ................................................................................... 22
FORM-H: DETAILS PERTAINING TO THE GSECL WORKS FOR WHICH BIDDER HAS BEEN QUALIFIED
DURING LAST TWO YEARS (I.E. DURING PERIOD 01.04.2011 TO 31.03.2013) ...................................... 23
FORM-I: ADDITIONAL INFORMATION & LITIGATION HISTORY .............................................................. 24
SCHEDULE I: BIDDER’S EXPERIENCE LIST................................................................................................ 25
SCHEDULE II: BIDDER’S DETAILS OF PERSONNEL ................................................................................... 96
SCHEDULE B ........................................................................................................................................... 97
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Forms And Agreement Page 14 of 169
FORM-A: DETAILS OF STRUCTURE & ORGANIZATION.
1) Name of Bidder
2) Nationality of Bidder
3) Office address (with
Telephone Number
Telex / Fax Number
4) Year of Establishment
5) Location of Establishment
6) Application is submitted as
A. an individual
B. a proprietary firm
C. a firm in partnership
D. a limited company or corporation
E. a group of companies
7) Attach the Organization chart showing the structures of
the Organization including the names of the Directors &
position of Officers
8) Number of years of Experience as a prime contractor
(shouldering major responsibility)
i) in own country
ii) other countries (specify country)
9) For how many years has your organization been in
business of similar work under it’s present Name?
What were your fields when your organization was
established?
Whether any new fields were added in your organization?
And if so, when?
10) Whether you were required to suspend construction for
period more than six months continuously after the work
is started? if so, give the name of project and reasons
therefore.
11) Have you ever left the work awarded to you incomplete?
If so, give name of projects and reasons for not
completing work.
12) In how many your projects were penalties imposed for
delay? (Please give details)
13) In which fields of civil engineering construction do you
claim specialization and interest?
14) Give details of experience in Dismantling & construction
works with modern Technology & quality control.
15) Give details of experience for various related works of
similar magnitude
16) Give details of experience in using latest demolishing &
construction equipment and related to quality control.
17) Give details of soil and material testing laboratory, if
any?
18) In how many of your works cases Litigation has arisen.
Signature of Contractor
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Forms And Agreement Page 15 of 169
FORM-B: DETAILS OF PERSONNEL.
Give details of key Technical & Administrative Personnel who could be assigned the work.
(A) Details of the Directors:
1) Name of Director:
2) Address:
3) Organization:
(B) Key Technical & Administrative Personnel & Consultants
1) Name
2) Professional Qualification
3) Present position in the firm
4) Professional experience and details of work carried out.
5) No. of years worked with the Applicant.
6) Languages known
(C) Additional information
Skilled and other labour (indicate number category wise)
1) Skilled labour
2) Other labour
Signature of Contractor
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Forms And Agreement Page 16 of 169
FORM-C: DETAILS OF MACHINERIES & EQUIPMENT
Give details of Machinery & Equipment owned and proposed to be used for the work
1) Name of Equipment
i) Excavation Equipment
a) Excavators
b) Tippers
c) Dozers/Tractors with blade
d) Compressors and Breakers equipment for rock excavation
e) Equipment required for drilling & blasting.
ii) Concreting Equipment
a) Batching Plant
b) Mobile/Transit concrete mixers
c) Concrete Pumps
d) Vibrators[ needle, shutter, high frequency type]
e) Concrete placer boom
f) Bar cutting and Bending machines
g) Grout pumps
h) Water tankers
i) Weigh batcher
j) Cube Test machine
k) Lift
iii) Dismantling /Rock cutting & Other machineries
a) Pump sets for dewatering
b) Generators
c) Cranes
d) Concrete Breakers with compressor machine
e) JCB/ Hitachi with Hydraulic Hard rock Breakers
f) If any other latest machineries
iv) Slip-form shuttering
v) Any other machinery or equipment required for completion of project.
vi) Tower crane, Crawler crane, Derrick cranes, mobile cranes
vii) Winches, hoist
viii) Cable way with head mast, winch track rope etc.
ix) Trucks/dumpers
x) Surveying Instruments, lessor plumb testing equipment
xi) Piling equipment
2) No. of units of each category
(Give details whether new and/or old owned and / or leased)
3) Year & make of equipment for each category & date of purchase/lease (with period of lease &
date of completion of the lease)
4) Capacity of each category of equipment
5) Normal life specified by the Manufacturer for each equipment in working hours (age &
condition of the equipment)
6) No. of actual working hours put in by the machine/equipment.
7) Present location of each equipment.
8) Present condition of each equipment.
9) Depreciated cost of each equipment
10) Remarks.
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Forms And Agreement Page 17 of 169
FORM - D1: DETAILS OF EXPERIENCE OF COMPLETED WORKS
Give details of the similar type of work completed during last 7 years in the following Proforma
(separately for each work)
1) Name of work.
2) Agreement No. & Date
3) Country and location
4) Client’s name and address
5) Total tendered cost of work
6) Brief description of work Including principal features and quantities of main items of the work such
as earth work, Concrete, Masonry, brick lining work.
7) Annual achievement (duly supported by certificate from Engineer-In-Charge)
a) Of key quantities, total Physical output of last seven Years(Separately for each item) (For
excavation, embankment, Brick lining and structures)
b) Financial output in Rs. (Including cost of materials supplied by department)
8) Period of completion
a) Originally stipulated time limit Date of start.
b) Extended time limit if any
c) Actual time taken to complete the work.
d) Reasons for non-completion of work in stipulated time limit/ extended time limit if so.
9) Name of bidder’s Engineer-In-Charge of the work and his educational Qualification.
10) Where there any penalties/fines/ stop notice/compensation / liquidated Damage imposed?(Yes or
NO) (If yes, give amount and explanation)
11) Give details of annual production Record, in respect of earth work in excavation and banking from
Borrow area and concrete work. In statement No.S1 (a) and Statement No. S1(b) and Financial
performance in Form G respectively attached.
12) Details of litigation/arbitration Cases, if any pertaining to works completed.
NOTE: Attached clients’ certificate for the details furnished in this Form. (Not below rank of Executive
Engineer or equivalent).
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Forms And Agreement Page 18 of 169
FORM-D2: DETAILS OF EXPERIENCE OF ONGOING SIMILAR WORK.
Give details of on-going work and performance during last 7 years in the following Performa (separately
in form for each work)
1) Name of work:
2) Agreement No. & Date:
3) Location:
4) Client’s name and Address:
5) Tendered cost of work:
6) Name of bidder’s Engineer-In-Charge with his educational qualification:
7) Brief description of work including principal features and quantities of main items of the work such
as earth work, excavation in soil, concrete, (masonry in hydraulic structure, lining):
8) Details of works on hand
i) Percentage of Physical completion
ii) Amount billed for the work completed
iii) Date of start
iv) Cost of work remaining to be executed
v) Stipulated date of completion:
vi) Anticipated date of completion
9) Explain for non-completion of work within stipulated time limit, if so.:
10) Where there any penalties/fine/Claims/stop notice/compensation liquidated damages imposed?
(Yes/No) (If yes, give amount and explanation):
11) Details of litigation/arbitration Cases, if any.:
12) Attach client’s certificate for the Details furnished in this form (Not Below the rank of Exe. Engineer
or Equivalent):
Signature of the Contractor
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Forms And Agreement Page 19 of 169
FORM - E: DETAILS OF FINANCIAL CAPABILITY
1) Name of firm
2) Name of Partner/Director
3) Capital
a) Authorized
b) Issued and paid-up
4) Furnish Balance sheet and profit and loss statement with Auditor’s report and Income Tax
assessment orders for last seven years. It should interalia include the following information.
i) Working capital
ii) Foreign Investment
iii) Turnover for the last seven years(Furnish reference page number to balance sheet attached)
Sr.
No.
Year Turnover Rs. in Lac
Reference pg. No. of balance sheet
1 2006-2007
2 2007-2008
3 2008-2009
4 2009-2010
5 2010-2011
6 2011-2012
7 2012-2013
iv) Gross income during last seven years
Sr.
No.
Year Gross Income Rs. in Lac
Reference pg. No. of balance sheet
1 2006-2007
2 2007-2008
3 2008-2009
4 2009-2010
5 2010-2011
6 2011-2012
7 2012-2013
v) Total liabilities
a) Ratio or acid- test (Ratio of Assets divided by current liabilities)
b) Total liabilities to net worth
vi) Maximum gross income from Contract works during the seven years.
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Forms And Agreement Page 20 of 169
vii) Details of cash flow for three months at the peak construction period.
5) What is the maximum annual turn-over of the project that you can handle? (please give details)
6) Have you ever been denied tendering facilities by any Government, Department / Public sector
under taking? (If yes, please give details)
7) List your source of finance.
8) Amount of financial soundness Certified by Nationalize Bank (Attach copy of certificate)
9) Name and address of Bank from whom Reference can be obtained.
10) Have you ever been declared bankrupt? (if yes, please give details )
GUJARAT STATE ELECTRICITY
CORPORATION LTD. SPECTRUM TECHNO
CONSULTANTS PVT. LTD.
Signature of Contractor Forms And Agreement Page 21 of 169
FORM - F: ADDITIONAL INFORMATION
(A) Please add any further information, which the bidder considers relevant in regard to his capabilities.
(B) Please give a brief note indicating why the bidder considers himself eligible for pre-qualification for the work.
(C) List of works for which bidders have already been submitted to the client but not awarded.
Sr.
No.
Name of work Estimated
amount Rs. (in
Crores)
Date of
submission
of offer
Name of client Likely date
of award
Position with
reference to
lowest bid
Signature of the Contractor
GUJARAT STATE ELECTRICITY
CORPORATION LTD. SPECTRUM TECHNO
CONSULTANTS PVT. LTD.
Signature of Contractor Forms And Agreement Page 22 of 169
FORM G: STATEMENT SHOWING THE DETAILS OF EXPERIENCE IN EXECUTION OF GOVERNMENT UNDERTAKING AGENCIES AND
REPUTED CORPORATEFOR LARGE CIVIL ENGINEERING WORKS (LAKHS RS.)
Sr.
No.
Name of Work Locality/
Region
Cost of
Work
Whether
completed
or in
progress
Cost of
work
executed
Year
2006-
2007
2007-
2008
2008-
2009
2009-
2010
2010-
2011
2011-
2012
2012-
2013
GUJARAT STATE ELECTRICITY
CORPORATION LTD. SPECTRUM TECHNO
CONSULTANTS PVT. LTD.
Signature of Contractor Forms And Agreement Page 23 of 169
FORM-H: DETAILS PERTAINING TO THE GSECL WORKS FOR WHICH BIDDER HAS BEEN QUALIFIED DURING LAST TWO YEARS (I.E.
DURING PERIOD 01.04.2011 TO 31.03.2013)
Sr. No. Name of Work Locality/
Region
Estimated
cost put to
tender
Qty. of
Excavation
items
Qty. of
concrete/
masonry/
structures
Prescribed
time limit
for
completion
If work
awarded
give
present
status of
progress
of work
Details of concerned Executive
Engineer of GSECL
Refere
nce No.
* Name Full
Addr
ess
Tel
Nos.
Fax.
No.
* Reference no. Under which the result of prequalification informed by the EE/SE to the bidder
Signature of Contractor Execution and Quality Control Page 24 of 169
FORM-I: ADDITIONAL INFORMATION & LITIGATION HISTORY
Name of Applicant or partner of a joint venture
1. Please describe: Company’s history of litigation or arbitration from contracts executed in the last
ten years or currently under execution. Please indicate for each case the year, name of employer,
cause of litigation, matter in dispute, disputed amount, and whether the award was for or against
company.
2. Please add any further information that you consider to be relevant to the evaluation of your
application for qualification. If you wish to attach other documents, please list below.
Signature of Contractor Execution and Quality Control Page 25 of 169
SCHEDULE I: EXPERIENCE LIST
A list of similar jobs executed by the Bidder & Name with address of a person whom reference can be
made, by the GSECL, if required. (Bidders shall submit the information in the Format detailed here as
under.)
Sr.
No.
Name &
Description of
work
Value of
work
executed
Time
period
as per
WO
Actual time
period for
completion
Date of
completi
on
Client Persons to
whom
reference
may be
made
Principal
features
Contractor’s Representative’s legible signature:
___________________________________________________
Name of person:
___________________________________________________________________________________
Seal of Company, Date & Place:
____________________________________________________________________
Signature of Contractor Execution and Quality Control Page 26 of 169
GUJARAT STATE ELECTRICITY CORPORATION LIMITED KLTPS.
I N T E G R I T Y P A C T
OUR ENDEAVOUR
To create an environment where business confidence is built through best business practices and
is fostered in an atmosphere of trust and respect between providers of goods and services and
their users for the ultimate benefit of society and the nation.
GSECL’S COMMITMENT PARTY’S COMMITMENT
To maintain the highest ethical standards in
business and professions.
Not to bring pressure recommendations from
outside GSECL to influence its decision.
Ensure maximum transparency to the
satisfaction of stakeholders.
Not to use intimation, threat, inducement or
pressure of any kind on GSECL or any of its
employees under any circumstances.
To ensure to fulfill the terms of agreement /
contract and to consider objectively the view
point of parties.
To be prompt and reasonable in fulfilling the
contract, agreement, legal obligations.
To ensure regular and timely release of
payments on due dates for work done.
To provide goods and / or services timely as per
agreed quality and specifications at minimum cost
to GSECL.
To ensure that no improper demand is made by
employees or by anyone on our behalf.
To abide by the general discipline to be
maintained in our dealings.
To give maximum possible assistance to all the
Vendors / Suppliers / Service Provider and
others to enable them to complete the contract
in time.
To be true and honest in furnishing information.
To provide all information to suppliers /
contractors relating to contract / job which
facilitates him to complete the contract / job
successfully in time.
Not to divulge any information, business details
available during the course of business
relationship to others without the written consent
of GSECL.
To ensure minimum hurdles to vendors /
suppliers / contractors in completion of
agreement / contract / work order.
Not to enter into cartel / syndicate /
understanding whether formal / non-formal so as
to influence the price.
Seal & Signature
(GSECL’s Authorized Signature)
Seal & Signature
Party’s Authorized Person)
J.E. (Civil) D.E. (Civil)
Name :
E.E. (Civil) S.E. (Civil)
CHIEF ENGINEER (G)
Sign.of Contractor KLTPS
Signature of Contractor Execution and Quality Control Page 27 of 169
TENDER FOR THE WORK ___________________________________On Firm’s Letter
Head.
CERTIFICATE-“A”
I / We
____________________________________________________________________
M/s. ___________________ hereby Certify that M/s. ___________________ is not
related with other firms who have submitted tenders for the same items under this
inquiry / Tender.
Seal of the Firm Place Date
SIGNATURE OF THE BIDDER WITH DESIGNATION
Signature of Contractor Execution and Quality Control Page 28 of 169
ANNEXURE- I
Financial Department ,GR.No. EMD/10/2013/107/DMO Dtd.06/04/2013
(A) Guarantees issued by following banks will be accepted as SD/EMD on permanent basis.
1. All Nationalized Banks including the Public Sector Bank IDBI Ltd.
2. Private Sector Banks authorized by RBI to undertake State Government Business
(at present - Axis bank, ICICI bank and HDFC bank)
(B) Guarantees issued by following banks will be accepted as SD/EMD for period up to March 31, 2015.The validity cut-off date in GR is with respect to date of issue of Bank Guarantee irrespective of date of termination of Bank Guarantee.
1. Commercial Banks
1. Kotak Mahindra Bank
2. Yes Bank
3. IndusInd Bank
4. Ratnakar Bank.
5. Karur Vyasa Bank
6. DCB Bank
7. ING Vyasa Bank
2. Co-operative Banks of Gujarat
1. The Kalupur Commercial Co-operative Bank Ltd.
2. Rajkot Nagarik Sahakari Bank Ltd.
3. The Ahmedabad Mercantile Co-operative Bank Ltd.
4. The Mehsana Urban Co-Operative Bank Ltd.
5. Nutan Nagrik Sahakari Bank Ltd.
Signature of Contractor Execution and Quality Control Page 29 of 169
ON STAMP PAPER OF Rs.100/-
FORM OF BANKER’S UNERTAKING
(For Security Deposit for work period as per Terms and Conditions of Tender)
We, Bank of ______________________________________________ hereby agree
unequivocally and unconditionally to pay immediately on demand in writing from the Gujarat
State Electricity Corporation Limited, or any Officer authorized by it in this behalf any amount up
to and not exceeding Rs.__________ (in words) Rupees
____________________________________________________________________
to the said Gujarat State Electricity Corporation Limited on behalf of
M/s.___________________________________________________ who have entered into a
contract for the supply / works specified below :
L.O.I. No. _____________________________________________________ dated
______________.
This agreement shall be valid and binding on this Bank upto and inclusive of
___________________ and shall not be terminable by notice or by change in the constitution of
the Bank or the firm of Contractors / Suppliers or by any other reason whatsoever and our
liability hereunder shall not be impaired or discharged by any extension of time or variations or
alterations made, given conceded or agreed, with or without our knowledge or consent, by or
between parties to the said within written contract.
“NOT WITHSTANDING” anything contained herein before, our liability under this guarantee is
restricted to Rs._______________ (Rupees
_______________________________________________________ only). Our guarantee shall
remain in force until _______________ (date of validity of the Guarantee). [Unless demands or
claims under this Bank Guarantee are made to us in writing on or before _____________ (date
should be 1 month after the above validity period of BG), all rights of Beneficiary under this
Bank Guarantee shall be forfeited and we shall be released and discharged from all liabilities
there under]:
Place :
Date :
Please Mention here Complete Postal Signature of
Address of the Bank with Branch Code, Bank’s Authorized Signatory
Telephone and Fax Nos. with Official Round Seal
Signature of Contractor Execution and Quality Control Page 30 of 169
EMD BANK GUARANTEE FORMAT
FOR TENDER /ENQ. NO. ___________________________________
APPENDIX – I
(BANK GUARANTEE ON NON-JUDICIAL STAMP PAPER OF Rs.100)
WHEREAS M/s.
_______________________________________________________________
(Name and Address of the Firm) having their registered Office
at______________________
_________________________________________________(Address of the Firm’s registered
Office) (hereinafter called the Tenderer) wish to participate in the Tender
No.__________________________ for
______________________________________ of (supply / Erection / Supply & Erection /
Work) of __________________________________ (Name of the material / equipment / work)
for _________________________ Gujarat State Electricity Corporation Limited and WHEREAS
a Bank Guarantee for (hereinafter called the “Beneficiary”) Rs. _____________ (Amount of
EMD) valid till ____________ (mention here date of validity of this Guarantee which will be 4
(FOUR) months beyond initial validity of Tender’s offer) which is required to be submitted by
the Tenderer along with the Tender.
We,
___________________________________________________________________
_______
(Name of the Bank and address of the Branch giving the Bank Guarantee) having our
registered Office at _____________________ (Address of Bank’s registered Office) hereby
give this Bank Guarantee No. _________________dated ____________ and hereby agree
unequivocally and unconditionally to pay immediately on demand in writing from the Gujarat
State Electricity Corporation Limited or any Officer authorized by it in this behalf any amount not
exceeding Rs.____________ (amount of EMD) (Rupees
______________________________________________________) (in words) to the said
Gujarat State Electricity Corporation Limited on behalf of the Tenderer.
We, ____________________________________________ (Name of the Bank) also agree that
withdrawal of the tender or part thereof by the Tenderer within its validity or non-submission of
Security Deposit by the Tenderer within one month from the date of tender or a part thereof has
Signature of Contractor Execution and Quality Control Page 31 of 169
been accepted by the Gujarat State Electricity Corporation Limited would constitute a default on
the part of the Tenderer and that this Bank Guarantee is liable to be invoked and encashed
within its validity by the Beneficiary in case of any occurrence of a default on the part of the
Tenderer and that the encashed amount is liable to be forfeited by the Beneficiary.
This agreement shall be valid and binding on this Bank upto and inclusive of
____________________ (mention here the date of validity of Bank Guarantee) and shall not be
terminated by notice or by Guarantor change in the constitution of the Bank or the Firm of
Tenderer or by any reason whatsoever and our liability hereunder shall not be impaired or
discharged by any extension of time or variations or alterations made, given, conceded with or
without our knowledge or consent by or between the Tenderer and the Gujarat State Electricity
Corporation Limited.
NOT WITHSTANDING anything contained hereinbefore our liability under this Guarantee is
restricted to Rs. _________________ (amount of EMD) (Rupees
________________________________________________ (in words). Our Guarantee shall
remain inforce till _____________ (date of validity of the Guarantee). Unless demands or
claims under this Bank Guarantee are made to us in writing on or before ___________ (date
should be 1 month after the above validity period of BG), all rights of Beneficiary under this
Bank Guarantee shall be forfeited and we shall be released and discharged from all liabilities
there under.
Place :
Date :
Please mention here complete Postal Signature of the
Address of the Bank with Branch Code, Bank’s authorized
Telephone and Fax Nos. Signatory with Official Seal.
________________________________________________________________
NAME OF DESIGNATED BANKS :
1. All Nationalized Banks including Public Sector Banks IDBI Bank Ltd.
2. Private Sector Banks authorized by RBI to undertake the State Government business, which are (i) Axis Bank (ii) ICICI Bank (iii) HDFC Bank.
Note: The Banks shall be the Banks recognized / notified by the Finance Department,
Government of Gujarat (GoG) from time to time.
Signature of Contractor Execution and Quality Control Page 32 of 169
GUJARAT STATE ELECTRICITY CORPORATION LTD. KUTCH LIGNITE THERMAL POWER STATION,PANANDHRO, Ta. Lakhpat, Dist.: Kutch
SCOPE OF WORK
Design, Engineering and Turnkey Execution for Construction of 190 M High RCC
Chimney, Flue Duct Foundation and related work to suit 190 M Chimney at KLTPS,
Panandhro, Gujarat
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Scope of Work Page 33 of 169
TABLE OF CONTENTS (SCOPE OF WORK)
1.0 GENERAL .................................................................................................................................... 34
2.0 SCOPE OF WORK OF THE CONTRACTOR .................................................................................... 34
3.0 TERMINAL POINT ....................................................................................................................... 36
4.0 TIME OF COMPLETION AND WORK SCHEDULE ......................................................................... 36
5.0 PROJECT SYNOPSIS AND DATA ................................................................................................... 37
6.0 HANDING OVER OF SITE ............................................................................................................. 38
8.0 APPROACH ROADS ..................................................................................................................... 39
9.0 PREVENTION OF POLLUTION ..................................................................................................... 39
10.0 SAFETY MEASURES (Separate sheet attached Annexure-I) ....................................................... 39
11.0 EQUIPMENTS AND MACHINERY ................................................................................................ 39
12.0 CONSTRUCTION AND WORKMANSHIP ...................................................................................... 39
13.0 ROYALTIES, TAXES, DUTIES, ETC. ............................................................................................... 39
14.0 COMPLETION OF JOB ................................................................................................................. 40
15.0 STOPPAGE OF WORK ................................................................................................................. 40
16.0 QUALIFIED PERSONNEL .............................................................................................................. 40
17.0 APPROVALS, PERMISSIONS, ETC. ............................................................................................... 40
18.0 DEFECT LIABLITY PERIOD ........................................................................................................... 40
SPECIAL CONDITIONS OF THE WORK .................................................................................................... 41
ANNEXURE-I ........................................................................................................................................... 42
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Scope of Work Page 34 of 169
SCOPE OF WORK
1.0 GENERAL
The scope of work shall comprise all civil, structural, architectural, mechanical, electrical and
instrumentation works including collection of all site related data, conducting site investigations, Detail soil
exploration ,design, preparation of all construction drawings, supply of all labour, materials, construction,
fabrication, erection and testing etc whatever necessary for RCC brick lined Chimney. The works shall also
include those required for Installation, Commissioning, testing, operation and maintenance of RCC
Chimney though not mentioned herein.
2.0 SCOPE OF WORK OF THE CONTRACTOR
2.1 CONSTRUCTION ENABLING WORKS
1) Construction water to be arranged by the Bidder.
2) Distribution of construction power within site boundary
3) Testing lab and fabrication yard
4) Storage yard
5) Grading of the site with jungle cleaning.
2.2 RCC brick lined CHIMNEY AND FLUE DUCT
Design and construction of Civil, Structural, Architectural, Mechanical, Electrical and Instrumentation
supply and works including Wind tunnel study. work to be provided by the contractor, unless specified
otherwise, shall include but shall not be limited to the following:
1) Providing of all labour, Supervision, services, securities,insurance, material, power, fuel, complete slip
forms system, templates, supports, scaffolding, tools, plants, construction equipment approaches,
transportation etc. required for the entire work
2) Prepare and submit for approval of the detailed schemes for operations like material handling,
placement of concrete, fabrication,etc. and for items like approaches, services etc.
3) Carrying out RCC Design mix through Govt approved laboratory and submit for approval the mix
proportion for concrete to be adopted on job.
4) Carrying out of testing of the samples through Govt approved laboratory and submit for approval of
the results of tests for various properties of the following materials confirming to relevant I.S
Specifications.
a) Ingredients of concrete i.e. Cement, Coarse aggregate, Fine aggregate, reinforcement bars etc.
b) Concrete
c) Metal work components
d) Fire bricks
e) Castable refractories
f) Insulation material
g) Paints
5) Soil investigation performed by them at Site
6) Preparation of design basis report, design calculation, drawings including detail construction
drawings, fabrication drawings and obtaining approvals from various statutory government and non-
governmental bodies including approval from Owner’s engineer/consultant.
7) Demolition of existing structures like Toilet Block, Silo, drains, pavement, foundations etc. in area of
the proposed chimney location, including removal, disposal of the same, clearing the site and
rerouting the existing demolished drains and other systems.
8) All excavation works in all types of soils/ rocks including de-watering as required.
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Signature of Contractor Scope of Work Page 35 of 169
9) Providing and laying of grounding mat.
10) Excavation and back filling around the raft foundation up to a distance of 10.0 m from the periphery
of foundation including RCC plinth concreting.
11) Construction of following components:
a) Chimney raft foundation, shell & other allied works as per drawings.
b) Windshields of GI/SS, electrically operated rolling shutter, access door and floor/ roof slabs.
c) External RCC platforms with railing at various levels and pipe hand railings.
d) Brick flue lining including insulation with required supporting structures.
e) Ash collecting RCC hopper.
f) Access, maintenance and clean out doors.
g) Miscellaneous metal works for ladders with safty cage , doors, windows and frames at various
openings, providing chimney top cap and miscellaneous fixtures.
h) Flue duct from terminal point to chimney
i) Flue duct supporting structures and foundations including all necessary structures.
12) Platforms, inserts & miscellaneous bolts and anchors required for instrumentation of chimney
13) /GI/SS Strakes including all fixtures and embeds as required.
14) Lightning protection and grounding systems.
15) All painting work including day warning painting as per aviation requirements.
16) Provision of drainage system for discharging rainwater, from platforms to ground up to terminal point
of discharge.
17) Aviation night warning lights, lighting system inclusive of all accessories and cabling work.
18) Provision of necessary air ventilation system inside the stack.
19) Installation of lights at all platforms.
20) Installation of receptacles.
21) Providing and installation of rack & pinion elevator of 400 kg capacity with necessary guides,
supporting steel, facility for landing at each platform and other accessories etc. as required for safe
and trouble free operation.
22) A.C. Distribution Board & Lighting Boards etc.
23) Cables and accessories.
24) Mandatory spare parts.
25) One (1) set of special tools and tackles.
26) All relevant drawings, data and instruction manuals.
27) Necessary site clearing and grading all-round the RCC chimney.
28) Provision of necessary test and instrument ports through flues of required size, number and at
required level as per standard norms for measuring concentration of particulate matters like Nox, Sox,
CO etc. in the flue gas for monitoring and taking necessary measure for environmental pollution
control with Opacity meter and all accessories etc complete system.
29) Wind tunnel model study for determining the aerodynamic interference. The study shall be done by a
specialist expert agency in this field acceptable to Owner.
30) Furnishing of all materials labour, tools, plant and equipment, transportation, transit insurance,
fabrication, supervision construction as per drawings including embedment of bolts, inserts, leaving
holes, pockets, grooves, chamfers as shown therein and all incidental items not shown or specified but
reasonably implied or necessary for satisfactory completion of the project as a whole.
It is not the intent to specify completely herein all details of design and construction of the works
covered under this specification. All works shall be done as per relevant standard specifications and in
a manner acceptable to “Engineer-In-Charge”, who shall have the power to reject any work or
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CORPORATION LTD.
Signature of Contractor Scope of Work Page 36 of 169
material. In case of any conflict regarding the interpretation of meaning of specifications or drawings,
Engineer shall interpret such meaning, which will be final and binding on the Contractor.
31) Supply all brand new equipment and accessories as specified with such modification and alteration as
agreed upon in writing after mutual discussion.
32) Unloading & intra-site transportation of materials.
33) Making all necessary roads and approaches to carry out the work without disturbing existing plant
system
34) Any additional works/supply whether mentioned herein or not in this specification but necessary to
complete RCC Chimney in all respects, as well as require for operation and maintenance purpose shall
be deemed to be in the scope of this tender and the agency has to provide the same at no extra cost.
35) The drawing and data given in tender documents are only for guideline purpose and bidder has to
verify the details at site and with documents.
36) The successful bidder has to carry out the design and whole construction work of Chimney in all
respect as per the relevant standards specifications, codes, rules and standard practices. The agency
has to provide the all materials as per relevant standard specifications of standard manufacturers of
best quality with latest technology and of best workmanship. The materials to be used shall be get
approved from EIC/ Consultant before using in the work.
37) All the above works shall conform to high standards of design with considering high factor of safety
considering the appropriate seismic zone, wind velocity, soil bearing capacity, environmental and soil
property, rain fall data and other engineering aspects. Design and construction shall conform in every
respect to all local and state regulations governing such works and to stipulations of Indian Standards
unless stipulated otherwise in detail specification.
Quantities, sizes and capacities of various systems mentioned in this specification and enclosed
drawings are tentative and for BIDDER’s guidance only.
3.0 TERMINAL POINT
The terminal point for gas flue duct shall be from the outlet of the relevant ID fans of Unit #4.
TIME OF COMPLETION AND WORK SCHEDULE
The Bidder shall carefully read the instructions as outlined below
3.1 The total Work covered under this specification including full-fledged commissioning of the chimney
shall be completed in all respects within 24 (Twenty Four) months from the date of commencement by
the EIC.
3.2 Time is the essence of the Contract. Contractor’s particular attention is drawn to the fact that the time
schedule for completion of this Contract is firm and has to be strictly complied with. It is essential that
the Contractor strictly adhere to work schedule mutually agreed upon between him and the Owner /
Engineer.
3.3 The Contractor within three weeks of the date of award of contract, shall commence work and submit
to the GSECL for approval a detailed work schedule along with a detailed PERT and BAR charts showing
how he proposes to carry out the work at the required rate specifically mentioning time period as well
as date of completion and such approved schedules must be strictly adhered to by the Contractor. The
Schedules shall be reviewed periodically with the Owner / Consultant to ensure that the completion
date will be met and to institute all corrective steps such as mobilizing additional resources in terms of
labour, materials, equipment, tools and plant, night work etc. at no extra cost to the Owner to achieve
any accelerated progress at any time to the extent required to adhere to the completion dates. The
Owner reserves the right to revise the work schedule at his discretion in order to keep up to the
completion date and to suit the project requirements and such alterations shall not entitle the
Contractor to any extra payment.
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Scope of Work Page 37 of 169
3.4 The Contractor shall furnish the Engineer / Consultant with fortnightly progress reports with coloured
photographs in triplicate on the Saturday of every fortnight in the following format: -
3.5 The fortnight Progress shortfall, to make-up if any the shortfall In the event of the Contractor failing to
furnish the Owner / Consultant with fortnightly reports on time, the running payments shall be
withheld till submission of such reports.
4.0 PROJECT SYNOPSIS AND DATA
KLTPS is pit head lignite based Thermal Power Station in Kutch District of Gujarat, India. Two
units, Unit No. 1 & 2 of 70 MW each and Unit No. 3 & 4 of 75 MW are in operation at KLTPS. The
proposed chimney is intended for Unit No. 4, which will replace the existing 110m tall chimney
currently under operation. Additional information regarding the project is as listed below:
Owner : GUJARAT STATE ELECTRICITY CORPORATION LTD.
KACHCHH LIGNITE THERMAL POWER STATION
Pandharo, P.O. S.K. Varmanagar, Taluka: Lakhpat, District:
Kachchh, Gujarat – 370601
Station : KLTPS, Panandhro
Location : Panandhro, Taluka Lakhpat, Dist. Kutch, Gujarat
Nearest Airport : Bhuj (140 km)
Nearest Railway Station : 1) Bhuj (140 km)
2) Gandhidham (180 km)
Road Approach : Bhuj is connected by National Highway No. 8 to Gandhidham.
State Highway No. 45 connects Bhuj to Lakhpat. Approach to
site is available from Dayapar Village and Gadauli Village.
All equipment and construction materials have to be
transported by road to site.
Nearest Port : Kandla (200 km)
Altitude : Approx. 56 m to 59 m above MSL
Rainfall : 1) 350 mm (Annual Average)
2) For one hour: 40 mm
3) For 24 hours: 470 mm
4) Period of water scarcity – June to August. Area is prone to
draughts for sustained period of 4 to 5 years.
Ambient Air
Temperature
: 1) Max. dry bulb temp.: 44 ºC
2) Min. dry bulb temp.: 5.4 ºC
3) Highest Monthly mean daily max. temp: 36 ºC
Relative Humidity : 1) Max. Humidity: 95%
2) Min. Humidity: 20%
3) Annual Mean Humidity: 60%
Ground Water Table
during monsoon
: 51.8 m below ground level. Brackish water.
Existing Drainage : Towards river Kali, Westwards.
Construction Power &
Construction Water
: Electricity will be made available by the Owner at rates
stipulated by the company from time to time. No water will be
made available by the Owner.
Wind Velocity : 50 m/s (Additional data in technical specifications)
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Scope of Work Page 38 of 169
Seismic Zone : Zone V as IS:1893 (Additional data in technical specifications)
Existing Chimneys : 3 Nos. RCC Chimneys are in the vicinity of the proposed
chimney:
1) 220 m tall Chimney
2) 190 m tall Chimney
3) 110 m tall Chimney
Type of Atmosphere : Saline corrosive oxides of Sulphur and Chlorides present in
surrounding air
5.0 HANDING OVER OF SITE
Efforts will be made by the GSECL to hand over the site to the Contractor free of encumbrance,
excluding the structures to be demolished/re-routed as mentioned elsewhere. However, in case of any
delay in handing over the site to the Contractor, the GSECL shall only consider suitable extension of time
for the execution of the work. It should be clearly understood that the GSECL shall not consider any
other compensation whatsoever viz. towards idleness of contractor’s labour, equipment etc.
DISMANTLING OF EXISTING STRUCTURES
This work shall consist of removing, as hereinafter set forth, existing structures as mentioned in the list
of structures to be demolished, which are in place but interfere with the new construction or are not
suitable to remain in place, and of salvaging and disposing of the resulting materials and back filling the
resulting trenches and pits.
Existing structures and the foundations, shall be removed up to the limits and extent specified in the
drawings or as indicated by the Engineer.
Dismantling and removal operations shall be carried out with such equipment and in such a manner as
to leave undisturbed, adjacent pavement, structures and any other work to be left in place.
All operations necessary for the removal of any existing structures which might endanger new
construction shall be completed prior to the start of new work.
Dismantling Toilet Block & Silo
The structures shall be dismantled carefully and the resulting materials so removed as not to cause any
damage to the serviceable materials to be salvaged, the part of the structure to be retained and any
other properties or structures nearby. Removal of overlying or adjacent material, if required in
connection with the dismantling of the structures, shall be incidental to this item.
Steel structures shall, unless otherwise provided, be carefully dismantled in such a manner as to avoid
damage to members thereof. If specified in the drawings or directed by the Engineer that the structure
is to be removed in a condition suitable for re-erection, all members shall be match-marked by the
Contractor with white lead paint before dismantling; end pins, nuts, loose plates, etc., shall be similarly
marked to indicate their proper location; all pins, pin holes and machined surfaces shall be painted with
a mixture of white lead and tallow and all loose parts shall be securely wired to adjacent members or
packed in boxes.
Dismantling Pavements and Other Structures
In removing pavements, drains and other structures like guard-rails, fences, manholes, inlets, etc.,
where portions of the existing construction are to be left in the finished work, the same shall be
removed to an existing joint or cut and chipped to a true line with a face perpendicular to the surface of
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Scope of Work Page 39 of 169
the existing structure. Sufficient removal shall be made to provide for proper grades and connections
with the new work as directed by the Engineer.
6.0 QUALITY ASSURANCE CHECK LIST
Quality assurance check list is enclosed to this specification giving details of Tests to be carried out on
various materials however also to be followed as per the relevant I S Specifications for material testing
and the agency shall be responsible for carrying out such tests at his own cost. The samples of all
materials to be tested by the Contractor shall be tested by him in presence of authorized representative
of the Engineer-In-Charge at the specified frequencies.
However such check list shall in no way limit the liabilities and responsibilities of the contractor in
regard to quality of work as detailed out in technical specification and documents.
7.0 APPROACH ROADS The Contractor shall make his own arrangement for approach to the work site and within the work area
for movement of men, material, machinery, other equipment etc. required for carrying out the work
included under this contract as per specifications and the rates quoted for various items under schedule
of items & shall be inclusive of the cost for preparation and maintenance of approach roads/haulage
roads/access roads, etc throughout contractual period.
Providing and laying required diameter RCC pipe in rain water / Nala’s / plant water drain/trenches
pipes passing of water, their diversions etc. for preparing the approach to carry out the work without
affecting to the resident of colony wherever necessary at no extra cost.
8.0 PREVENTION OF POLLUTION The contractor shall be solely responsible and liable for all the damages/activities caused by any
pollution that may take place during the execution of works and he shall make arrangements, as
approved by the Engineer for preventing pollution but, not withstanding, such approval, the entire
responsibility for any pollution shall rest with the contractor. No separate payment shall be made for
the pollution control measures and the quoted rates shall include the cost for all pollution control
measures.
9.0 SAFETY MEASURES (Separate sheet attached Annexure-I) The contractor shall ensure the safety of workers, material and structure including existing structures
during execution of the contract. Safety measures shall be followed during operations of
equipment/machinery being used. No separate payment shall be made for the safety measures and the
quoted rates shall include the cost for all safety measures.
10.0 EQUIPMENTS AND MACHINERY The contractor shall have to use his own latest safe technology equipment, machineries tools, tackles
etc as required, of good condition, duly tested and certified from C.A and any other machinery required
for the entire scope of work for all construction works activities.
11.0 CONSTRUCTION AND WORKMANSHIP The all construction materials and workmanship shall be in accordance with the items of Schedule-B as
well as per the relevant I.S. Specifications, P. W. D manuals and as per the booklet of GSECL “General
Specifications for Civil Works”. All the materials to be used shall be the best and from manufacturers,
make and brand as approved by Engineer-In-Charge. After getting the sample tested and approved the
same materials only shall be procured and used in the work by the contractor. The cost of all materials
are to be included in quoted rates.
12.0 ROYALTIES, TAXES, DUTIES, ETC. All the royalties, taxes, Government duties or any unforeseen expenses, if required to be made, shall be
borne by the agency. The rates quoted shall be deemed to account all such factors after careful
consideration of work and site condition. No extra claim shall be entertained in any circumstances on
any account.
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Scope of Work Page 40 of 169
13.0 COMPLETION OF JOB Any activity not specifically mentioned in the tender but necessary in the opinion of the Engineer-In-
Charge of the work, must be carried out for successful completion of job.
14.0 STOPPAGE OF WORK If due to any stoppages, or litigation / stay order etc. work is suspended then no idle charges will be
paid. Only suitable time limit extension will be granted based on genuine reason but no extra claim will
be entertained.
15.0 QUALIFIED PERSONNEL The contractor shall engage sufficient nos., of qualified engineers and trained supervisors (especially for
slip forming) at site, to look after the work on behalf of the agency. In no case, the work shall be allowed
to be continued without sufficient engineers/supervisors at site. Due care shall be taken by the
contractor in this regard.
16.0 APPROVALS, PERMISSIONS, ETC. During the working, all required government approvals/ permissions/N.O.C. from revenue department;
Gujarat Pollution Control Board (G.P.C.B.)/Airport Authority etc. shall be obtained by the contractor at
his own cost and shall have to be furnished to GSECL from time to time.
17.0 DEFECT LIABLITY PERIOD Contractor shall be responsible for carrying out Operation and Maintenance for 5 years including that of
structural steel, Electrical equipment and fittings and Mechanical parts and fixtures.
The contractor has to carry out painting in the 5th
year again before the defect liability period expires.
Any failure in Aviation lighting, opacity meters, Ducting insulation, Elevators etc. shall be replaced
without any extra cost as and when the failure occurs.
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Special Conditions Of The Work Page 41 of 169
SPECIAL CONDITIONS OF THE WORK
1.0 The contractor shall take all the required safety measures and observe all safety rules while
carrying the above excavation works etc. to avoid any type of accident and damage. The
contractor shall be held fully liable and responsible for any type of accident, injury, damage and
loss etc. if occur at site till the completion of work.
2.0 The quoted rates in Schedule –B shall remain firm and no any escalation towards price, labour,
POL or any other materials etc. shall be applicable till overall completion of the work under the
contract, during contract period or during extended period for this work
3.0 All royalties, sales tax, toll tax, local tax, development charges, VAT tax, & any other taxes
including Works Contract taxes etc. in respect of this contract shall be payable by the contractor
& Gujarat State Electricity Corporation Ltd will not entertain any claims whatsoever in this aspect.
Any statutory variation in future towards the above mentioned taxes that shall also be payable by
the contractor & Gujarat State Electricity Corporation Ltd shall not entertain any claim of
whatsoever nature, during or after the completion of this tendered work. Proof of such payments
made by the Contractor to the appropriate departments shall be produced to Gujarat State
Electricity Corporation Ltd failing which appropriate amount shall be withheld on getting
information / instruction from the concerned departments.
The rates are "Excluding the service tax". The reimbursement against service tax will be paid to
the contractor as per rules. The proof of payment made by the contractor to appropriate
department shall be submitted to GSECL, failing which the appropriate amount will be withheld
on getting information/ instruction from concerned department.
4.0 The contractor shall be deemed to have carefully examined the site for grading levelling for laying
as is where are basis and aware with the site, locations, elevations, structures, quantities, types of
the various soil strata whatever will be available while excavating grading the area. The
contractor shall be deemed to be fully aware with the local site conditions & sounding structures
and also all the terms & conditions, scope, drawings etc., attached herewith. The bidders are
ADVISED to visit the site, inspect the existing location of executing the work before quoting the
rates. Any extra claims for extra items, rates etc. for any reason will not be entertained after
acceptance of contract bid.
5.0 The contractor shall prepare & submit the detailed “as built” drawings, showing all the
dimensions in plans, elevations, section of the area to be excavated/ graded showing the original
as well as final levels taken jointly duly signed by Agency and GSECL Engineer and submit the
detailed schedules of quantities of various soil strata and take the signature of the Engineer-In-
Charge before start of excavation work from time to time and keep the records regularly.
6.0 The rates are inclusive of all type of labourers, tools, tackles, equipment, machineries, shoring,
staging, scaffolding cranes Excavators, Compressors breakers etc. staking, stockpiling the
removed materials category wise, their protection, preservation, storing, loading, unloading,
transporting for all leads lifts & elevations height/depths and inclusive of all risks & all liabilities,
providing all safety precautions, Insurance, securities, site cleaning levelling dressing the sites etc.
required for completion of the work in all respects.
7.0 Blasting will not be permitted under any circumstances.
8.0 The contractor shall dismantle and grade the area from top to foundation bottom including
removing and re-establishing the existing electric installation, pipelines, drainage lines, trenches
cables conduits, nallas, etc., without damage and to clear the site completely at no extra cost. The
contractor has to carry out the jungle clearance by removing all thick vegetation, plants, shrubs,
trees at their own cost.
9.0 The responsibility and liability of manpower to be engaged for this work will be totally of
contractor who has been awarded this contract and he will take away all these manpower in his
own establishments on completion of this contract. The GSECL will not be held responsible and
liable in any way in the matter.
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Special Conditions Of The Work Page 42 of 169
ANNEXURE-I
“GENERAL SAFETY RULES / NORMS TO BE OBSERVED BY THE CONTRACTORS” All the contractors working at Kutch Lignite Thermal Power Station shall have to strictly observe the
following Safety Rules. The Contractors shall be responsible for informing & observing these rules by
their supervisors / employees / labours as well as the supervisors / employees/ labours of their sub-
agencies / sub-Contractors engaged, if any. Prior to commencement of the work, Contractor shall have
to submit a written assurance on their letterhead to the concerned Sectional Head / Engineer-In-Charge
that they have thoroughly gone through these Rules, have educated their employees / employees of
their sub-contractor and will strictly observe the said Rules while execution of work under work contract
awarded to them. They will have to indemnify the Corporation for any loss or damage / accident / injury
to the Corporation’s property / employee or employee of their own in default of non - observing these
rules.
1) Persons to be employed for carrying out the work shall possess required qualification, be fully
trained and conversant for works to be done. All persons should have gate pass. Register
consisting the full details (i.e. photo, address, phone no, details of nearest relative, etc.) of all
persons is to be maintained. During the work execution, one trained & competent supervisor
should always remain present at site.
2) The contractor shall take all the required safety measures prior to commencement of work on
dangerous substances, machineries or area at which cautionary notice is displayed and obtain
“Line Clear” or “Work Permit” through the concerned Department / Section.
3) Prior to carrying out welding, gas cutting, furnace heating or any other hot work job, the
contractor shall remove all the inflammable material lying at or nearby worksite or cover it
properly by suitable protective covering. Also, special care shall be taken before carrying out such
job & see that all possible contributing factors to set fire shall be removed / vanished prior to
commencement of the work. Advance intimation shall be given to concerned section / fire section
to commence the work in fire prone areas. They should also keep ready all the First Aid / Fire
Extinguishers / equipment & fire extinguishing media / material like sand / water buckets or other
appropriate equipment at such place.
4) While carrying out work in confined space or inside vessel, the contractor shall obtain necessary
“Confined Space / Vessel Entry Permit” from concerned department prior to commencement of
the work.
For lighting in such areas, only 24-volt (ISI certified & with proper guard) hand lamp shall be used.
For taking care of the persons working inside the confined space / vessel, a supervisor / person
capable to keep continuous watch on person(s) working inside, assist them in case of emergency
or arrange to get immediate outside help, shall remain present at entry point and shall use full
body safety belt without fail.
While working inside sewage, trench or in-depth, a person to warn outsiders / entrants / passers
etc shall remain available near entry point or the entry point shall be cordoned by a barricaded
tape with a cautionary notice. After completion of the works, all the lids / covers / grills / grits
opened, shall be refixed / re-placed in the original position as it were prior to commencement of
the work and leave the work place in safe condition in all respect, so as to prevent accident to
fellow workers.
5) The contractor shall see that he / his persons do not block (by stacking material, spare parts,
tools, tackles, equipment, etc.), any passages / walkways / gangways / aisles / staircases / ladders
/ lifts or any other approaches / roads leading to plants or its auxiliaries, on which there is a traffic
movement or possible traffic movements in case of emergency. Such passages are meant for safe
escape in the event of emergency. If it is utmost necessary to carry out work in such area with
blocking of passage, prior permission of Competent Authority or the Engineer-In-Charge shall be
obtained. To demarcate / declare the area as UNSAFE, cordon it using barricading tape & display
suitable caution notice or keep a person to restrict / divert the traffic on this route through other
safe passage.
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Special Conditions Of The Work Page 43 of 169
6) Prior to use power / electrically operated hand tools / equipment / machines / gadgets like
welding machine, hand grinder, hand drill etc., ensure for its safe operation & use it only if it is
found safe to use. Do not use defective, unsafe or improperly maintained equipment.
The electrical power supply required to run such equipment shall not be taken directly at their
own but shall be obtained through concerned Electrical Maintenance Departments or their
authorized persons or under their observations / guidance only. The Electrical Section shall
provide temporary electrical connection up to contractor’s Mains Board on which it is compulsory
to install mains switch, ELCB & fuses of adequate capacity. All such equipment shall invariably be
earthed adequately to prevent electrical shock, sparking, short circuit etc. Power cord to be used
shall be of adequate capacity, without any joint & shall consist of earth wire also. Hence, it is
necessary to use adequate capacity 3- wire power cord for single & 5-wire power cord for three
phase power connections. The plugs, receptacles, pins, holders etc shall be of adequate capacity
& safe to use.
All electrical & mechanical equipment / tools-tackles viz. welding machine, cutting machine,
Grinder, Drill, Chain Pulley Blocks, Hook chooks etc required to be used during work execution
shall be of standard make & bear ISI certification mark on it. The consumables like welding
electrodes, grinding wheels / discs etc. which has specific prescribed life span shall not be used in
any case if its expiry date is over.
7) It is compulsory to use standard make Personal Protective Equipment (P.P.Es.) as per the job
requirement. Do not work without use of required P.P.Es. Contractor is responsible to provide
standard make (ISI approved) Personal Protective Equipment / Safety Gadgets suitable to give
sufficient protection against hazards involved in their work / job to their staff, as per the job
requirement and insist / enforce their staff to put on the same while at works.
The on-going work is liable to be stopped at any time if the contractors’ staff is found working
without P.P.Es. Following is the list of various P.P.Es. to be used for various works / worksites.
LIST OF SAFETY EQUIPMENTS
01 Industrial Safety Helmet For protection of head against falling objects or during
fall of person from height
02 Safety Goggles (Grinding,
Welding, etc.)
For protection of eyes against flying particles / dust,
chemical splash, spark, arc, flashover etc.
03 Face shield (Half or full) For protection of face against flying particles / dust,
chemical splash, spark, arc, flashover etc.
04 Earplug / Ear muffs For ear / hearing system protection while working in
high noise level area
05 Apron (Rubber/ PVC/
Asbestos/ Leather/ Cotton)
For body protection against chemicals, oils, sharp edged
objects, heat, hot objects etc.
06 Gloves (Rubber/PVC,
Asbestos, Leather, Electrical
shock proof)
For protection of hands against chemicals, oils, sharp
edged objects, heat, hot metals/objects, electricity etc.
07 Safety/ Leather/ Asbestos
shoes, Gum-boots etc.
For protection of leg/feet against falling objects, sharp
edged objects, heat, hot metals/objects, electricity etc.
08 Safety Belt(full body)/ Rope/
Life line/ Fall prevention
system etc.
For fall prevention while working at heights or in depth,
working in vessel or in confined space
09 Dust Respirator/ Scarf Protection of respiratory system against dust
10 Chemical Cartridge Respirator Protection against chemical fume/ vapor etc.
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11 Canister Gas Mask Protection against toxic/ poisonous fumes/ gases
12 Air supply respirators Working in oxygen deficient zone
8) Before using lifting machines / tackles (like C.P.Bs., Hook chooks, winch, forklift, mobile crane,
EOT crane etc.) & its attachments (like D-shackles, slings, U-clamps, Eye bolts or any fixtures), it
shall be checked and used only if found safe to use. Also, ensure that these are tested, examined
& certified in form no 9 / 10 by Competent Person as per the Factory act-1948 and its validity is
not expired. Further, it shall be fixed properly and firmly prior to lifting the weight.
9) Scaffoldings to be used for working at height shall be of adequate size & capacity. Obtain the
work permit when working at height. While climbing on such scaffolding or working on any
structure at height, use of full body safety belt & Helmet is compulsory. It is also necessary to
fasten chinstraps of the helmet.
10) Contractor or their employees shall not interfere in day-today routine plant activities / works
except the work assigned to them, and shall not loiter in the areas other than their work
jurisdiction, as well as shall not tamper / operate / touch the machineries / equipment /
auxiliaries with which they are not concerned. Also, the contractor shall strictly instruct their staff
not to sit or take rest at / near / below running plants, auxiliaries, systems or any place which is
risky, hazardous & prone to accident.
11) The cylinders containing poisonous / toxic or inflammable / explosive gas like Oxygen, Acetylene,
LPG, Hydrogen, Ammonia, Chlorine, CO2 or any type of material of explosive nature etc. shall be
handled safely taking due care. To handle / shift such cylinders a special trolley / cage meant for it
must be used but in no case it should be rolled. Domestic LPG cylinder shall not be used /
permitted.
12) On completion of the work, cotton waste, spilled oil / grease, pieces of welding rod & other waste
material shall be removed from work site and the area shall be left safe, neat & clean.
13) In case of any injury / accident while working, it shall immediately be reported to Safety
Department through concerned Sectional Head / Engineer. The prescribed Form No. 21 may be
obtained from concerned section or Safety Officer.
For any incident occurred but have no injury to any persons should also be informed to Safety
Officer as “Near Miss Incident.”
14) In all risky jobs, before starting the work, contractor should obtain General Safety Work Permit
from concerned section well in advance.
15) In case of noticing smoke or fire during their work execution, they shall make immediate efforts
to extinguish / control it and simultaneously inform the Fire Brigade on phone Nos. as Int. No.
[222] & M: 9099069658 shall shift the casualty to nearby hospital after rendering first aid in case
of accident.
16) Over & above these, contractor shall have to follow all the safety requirements / rules &
regulations / norms and legal provisions laid down in various statutes, particularly the provisions
of The Factories Act-1948 &The Gujarat State Factories Rules-1963 (Amended up to date) shall be
followed strictly. The contractor shall also obey the rules / regulations / instructions of the local
Competent Authority for safety requirements.
17) No women or young person shall be allowed to clean, lubricate or adjust any part of a prime
mover or of any transmission machinery while the prime mover or transmission machinery is in
motion. Examination or operation of motion machinery shall be made or carried out only by a
specially trained adult male worker wearing tight fitting clothing as per section 22 of factories act
1948.
18) No women or young person shall be employed or permitted to work in Lead-compound area like
battery room etc. as per schedule VI of GFR 1963.
19) All the relevant labour and industrial laws shall also be followed compulsorily.
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20) It is felt necessary to deploy safety officers / Safety supervisors by contractors / Agencies involved
in carrying out hazardous activities / operations inside TPS to have better and constant
supervision in terms of Health Safety and Environment activities.
21) In case, it comes to the notice of GSECL/KLTPS management that the safety guidelines / safety
rules / safety norms are not being followed then a minimum sum, which is to be decided by site,
shall be penalized on the contractor / Agency and for subsequent such violation, a severe penalty
/ action as deemed fit shall be imposed, which may please be noted.
22) The above rules shall be scrupulously followed and where required, they may contact the Safety
Officer for any ambiguity / further guidance in this regard.
23) For performance evaluation of contractor, safety factors of work accident, fire incident & near
miss accident will be considered. Steps can be taken to review the job assignment up to
cancellation for negligence.
Chief Engineer (G)
GSECL, KLTPS
GUJARAT STATE ELECTRICITY CORPORATION LTD.
KUTCH LIGNITE THERMAL POWER STATION, PANANDHRO, PO.: SKVNAGAR, Ta.
LAKHPAT, DIST. KUTCH
BOOKLET FOR TENDER AND CONTRACT FOR WORKS
Design, Engineering and Turnkey Execution for Construction of 190 M High RCC
Chimney, Flue Duct Foundation and related work to suit 190 M Chimney at KLTPS,
Panandhro, Gujarat
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TABLE OF CONTENTS (TENDER & CONTRACT)
GENERAL RULES AND DIRECTIONS FOR THE GUIDENCE OF CONTRACTOR ............................................... 48
TENDER AND CONTRACT FOR WORKS ....................................................................................................... 50
CONDITIONS OF CONTRACT ....................................................................................................................... 53
SPECIAL CONDITIONS OF CONTRACT ......................................................................................................... 66
GENERAL CONDITIONS OF CONTRACT....................................................................................................... 67
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GENERAL RULES AND DIRECTIONS FOR THE GUIDENCE OF CONTRACTOR
Notwithstanding anything contained to the contrary in the specification or tenders in subsequent
exchange of correspondence, the conditions of contract shall be binding on the contractor and any
change or variations expressed or implied, however made in the said conditions shall not be valid or
operative unless expressly sanctioned by the GSECL. The contractor shall be deemed to have fully
informed himself and to have special knowledge of the provisions of the conditions of contract herein
contained
1.0 All works proposed to be executed by the contract shall be noticed in one of the English and one
of the vernacular local daily newspapers, stating the work to be carried out as well as the date of
submitting and opening tenders and time allotted in carrying out the work. Also the amount of
earnest money to be deposited with the tender and the security deposit to be deposited by the
successful bidder and the percentage, if any.
2.0 Copies of specifications, design, drawings, estimated rates, scheduled rates and any other
documents required in connection with the work which will be signed by the Engineer-in- Charge
for the purpose of identifications shall be open for inspections by the contractors at the office of
the Executive Engineer during office hours.
3.0 Whether the works are proposed to be executed according to the specifications recommended by
the contractor and approved by a competent authority on behalf of the Gujarat State Electricity
Corporation Ltd, such specifications with designs and drawings shall form part of the accepted
tender.
4.0 The bidders and receipts for payments made on account of any work, when executed by a firm
should be signed by all the partners except where the contractors are described in their tender as
a firm, in which case the receipt shall be signed in the name of firm including the partners or
some other person having authority to do so.
5.0 The bidder at shall fill up the usual form stating at what percentage above or below rates
specified, he is willing to undertake the work. Only one rate or such percentage on all the
estimated rates or schedule rates shall be mentioned.
6.0 Bidder which proposes any alternation in the work specified in the form in invitation to tender or
in the time allowed for carrying out the works or which contain any other conditions of any sort,
will be liable to rejection.
7.0 No single tender shall include more than one work, but contractors who wish to tender, for two
or more works, shall submit a separate tender for each work. Tender shall have the name and the
number of the works, of which they pertain, be super scribed on the envelope.
8.0 The Engineer-In-Charge or his duly authorized assistant will open tenders in the presence of any
intending contractors who may be present at the time and will enter the amount of the several
tenders in a comparative statement in a suitable form. In the event of a tender being accepted,
the contractor shall there upon, for the purpose of identification, sign copies of the specifications
and other documents. In the event of tender being rejected, the officer (Engineer-In-Charge) shall
authorize the paying officer concerned to refund the amount of the earnest money deposited to
the contractor making the tender on his giving a receipt for the return of the money.
9.0 The officer, competent to dispose off the tenders, shall have the right of rejecting all or any of the
tenders, without assigning any reasons thereof.
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10.0 No receipt for any payment alleged to have been made by contractor in regard to any matter
relating to tender of the contract shall be valid of binding on the GSECL unless it is signed by the
Engineer-In-Charge.
11.0 The memorandum of work to be tendered for and the schedule of materials to be supplied by the
Gujarat State Electricity Corporation Ltd and their rates shall be filled in and completed by the
office of the Engineer-In-Charge before the tender form is issued if a form issued, to an intending
bidder has not been so filled in and uncompleted he shall request the said office to have this
done, before the completes and delivery his tender.
12.0 All works shall be measured, meet by standard measure and according to rules are custom and
usual in the use in the Gujarat State Electricity Corporation Ltd, and no proposal to adopt
alternative method will be accepted, the Engineer-In-Charge decision as to what is “the usual
method in use in the Gujarat State Electricity Corporation Ltd” shall be final.
13.0 Every contractor shall, except the registered contractor on the approved list of the GSECL,
produced, along with the tender a solvency certificate from the collector of the District within
which he resides, of a banker’s certificate of his financial stability, if he fails to produce such a
certificate his tender will not be considered.
14.0 All corrections and addition or pasted slips should be initialled
15.0 Bidder shall be deemed to have full knowledge of relevant documents, site conditions etc.
whether inspected or not by him.
16.0 Submissions of tender by a contractor implies that he has read the instructions and condition of
contract herein contained and has made himself aware of the scopes and specifications of the
work to be done and conditions and rates at which stores materials etc. will be issued to him and
local conditions and other factors bearing on the execution of the work.
17.0 Under no circumstances shall any contractor be entitled to claim enhanced rates for any item of
contract without prior sanction of the competent authority.
18.0 These rules and directions shall form part of the contract.
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TENDER AND CONTRACT FOR WORKS
I/We hereby tender for the Gujarat State Electricity Corporation Ltd (herein referred as “GSECL”) of the
work specified in the underwritten memorandum within the time specified Schedule B (Memorandum
showing items of work to be carried out) and in accordance, in all respect, with the specifications,
design, drawings and instructions in writing and as per annexed conditions of contract and agree that
when the materials for works are provided by the GSECL such materials and rates to be paid for them
shall be as provided in Schedule A hereto.
MEMORANDUM
1) General Description of Work:
2) Estimated Cost:
3) Earnest Money:
4) Security Deposit:
a) In addition to the security deposit at specified rate mentioned elsewhere, the contractor shall
pay in the form of bank guarantee an amount equal to 10% of the contract value towards
performance guarantee of the structure for 5 years from the date of completion of the work.
Such performance guarantee shall be valid till expiry of 6(SIX) months after the completion of
Performance Gguarantee Period.
b) Alternatively if desired by contractor, whole S.D. can be paid by bank guarantee of the following
banks.
A. Guarantees issued by following banks will be accepted as SD/EMD on permanent basis.
1. All Nationalized Banks including the Public Sector Bank IDBI Ltd.
2. Private Sector Banks authorized by RBI to undertake State Government Business
(at present - Axis bank, ICICI bank and HDFC bank)
B. Guarantees issued by following banks will be accepted as SD/EMD for period up to March 31,
2015.The validity cut-off date in GR is with respect to date of issue of Bank Guarantee
irrespective of date of termination of Bank Guarantee.
1. Commercial Banks
1. Kotak Mahindra Bank
2. Yes Bank
3. IndusInd Bank
4. Ratnakar Bank.
5. Karur Vyasa Bank
6. DCB Bank
7. ING Vyasa Bank
2. Co-operative Banks of Gujarat
1. The Kalupur Commercial Co-operative Bank Ltd.
2. Rajkot Nagarik Sahakari Bank Ltd.
3. The Ahmedabad Mercantile Co-operative Bank Ltd.
4. The Mehsana Urban Co-Operative Bank Ltd.
5. Nutan Nagrik Sahakari Bank Ltd.
C. The bank guarantee of Co-Operative banks and other scheduled banks etc. will not be accepted.
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Time allowed for the completion of work from date of issue of Work Commencement Letter.
Should this tender be accepted I/We hereby agree to abide by and fulfil all the terms and provisions of
the conditions of contract annexed hereto as applicable and in default thereof forfeit and pay to the
GSECL the sums of money mentioned in the said conditions.
Receipt No.___________ Date _____________ from the Gujarat State Electricity Corporation Ltd in
respect of the sum of Rs.__________________________ (Rupees
__________________________________________________________ (the amount to be specified in
figures and words) is herewith forwarded representing the earnest money (the full value of which is to
be absolutely forfeited to the GSECL should I/We not deposit the full amount of security deposit
specified in above memorandum in accordance with clause-(d). Security Deposit of the said conditions /
otherwise the said sum of Rs______________ shall be refunded on surrendering the original receipt, in
case of non-award of contact.
Signature of the
contractor____________________________________________________________________________
Address of the
contractor____________________________________________________________________________
_
Dated _________________ day of ________________year
Signature of
Witness______________________________________________________________________________
____
Address of
Witness______________________________________________________________________________
______
Occupation___________________________________________________________________________
________________
Dated ______________ day of ___________ year.
The above tender is hereby accepted by me on behalf of the Gujarat State Electricity Corporation Ltd.
Chief Engineer (G) KLTPS or his duly authorized assistant.
PROFORMA OF BANK GUARANTEE FOR SECURITY DEPOSIT/ PERFORMANCE
[On stamp Paper of Rs. 100/-]
The bank of _____________________________________________________ hereby agree
unequivocally and unconditionally to pay within 48 hours on demand in writing from Gujarat Electricity
Corporation Ltd. or any officer authorized by it in this behalf any amount up to and not exceeding
Rs.____________ [in words]
_______________________________________________________________ to the said Gujarat
Electricity Corporation Ltd. on behalf of M/s. ______________________________who have entered in
to contract for the supply / works specified below.
A/T NO ______________________________________ DATED _______________________________
This agreement shall be valid and binding on this Bank up to inclusive of _____________ and shall not
be terminable by notice or by change in the condition of the Bank or the firm of contractors or by any
other reasons whatsoever and our liability hereunder shall not be impaired or discharged by any
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extension of time or variation or alterations made, given conceded or agree, with or without our
knowledge or consent by our between parties to the said within written contract.
[NOTWITHSTANDING anything contained herein before our liability under this guarantee is restricted to
Rs. ____________________________ ,
[Rupees
_____________________________________________________________________________________
____]
Our guarantee shall remain in force until ______________________________
PLACE _________________________________
DATE __________________________________ SIGNED
_________________________________
Signature of contractor
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CONDITIONS OF CONTRACT
1.0 DEFINITIONS:
1.1 The Contract means the documents forming the tender and acceptance thereof, together with
the documents referred to therein or individual work order in the case of term contract, including
these conditions, schedules and / or additional conditions attached to the form of tender or
individual work, order, rate schedule, the specifications and the drawings and all these
documents as applicable taken together shall be deemed to form the contract.
1.2 The “Tender Document” means the form of tender, the applicable schedules and/or additional
conditions and the specifications and/or drawings as issued to the contractors for the purpose
preparing tender.
1.3 The expression “works” or “work” when used in the conditions of contract shall, unless there be
something in the subject or context repugnant to such construction means, the works or the work
contracted to be executed under or in virtue of the contract whether original or altered.
1.4 The “Contractor” means the individual or firm or company, whether incorporated or not,
undertaking the works and shall include his or its legal personal representative, successors and
permitted assignees.
1.5 “GSECL” means the Gujarat State Electricity Corporation Ltd. and the “Accepting Officer” means
the officer who is authorized to sign and signs the contract on behalf of the “GSECL.”
1.6 The letter “EE” means Executive Engineer who in the case of measurement and lump sum
contract, direct the contractor and the letters “SE” means Superintending Engineer” and “CE”
means Chief Engineer who administers and in the case of the term contracts directs the contract.
1.7 The “Engineer-in-charge” means all officers of the GSECL appointed by the Chief Engineer to
supervise the works or part of the works.
1.8 “Approved” and “Directed” means the approval or direction of the Chief Engineer to
Superintending Engineer or the person deputed by him for the particular purpose.
1.9 “B.S.” means the “British Standard” as issued by the British Standards institution. “A.S.” means
the American Standards as issued by the American Standard Institutions and “I.S.” means the
“Indian Standards” as issued by the Indian Standards Institutions. Wherever the above mentioned
abbreviations are preferred to, in the specifications and / or work orders, they mean the addition
with all amendments current at the date of issue of tender documents of work orders. In the case
of measurement and terms of contracts “Specifications” means those contained in Gujarat State
Electricity Corporation Ltd schedule together with any amendments etc. embodied in the tender
documents, “Drawings” refer to those accompanying the tender documents and/or any work
orders referred therein.
1.10 The “Contract Sum” means the sum accepted or the sum calculated in accordance with the prices
accepted in the tender and/or the contract rate as payable to the contractor for the full and
entire executing and completion of works.
1.11 “The date of completion” is the date or dates of completion of the work or any part of the works
set out or ascertained in accordance with the individual work orders and the tender documents
or any subsequent agreed amendments thereto.
2.0 SECURITY DEPOSIT
The contractor shall pay, within 10 days of the issue of Letter Of Intent, 5% of contract value as
Security Deposit. The Bank Guarantee from banks mentioned elsewhere in this tender, in lieu of
cash or government securities towards Security Deposit will be accepted. All damages, costs,
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charges, expenses and other sums which may be or may become due or payable by the
contractor to the GSECL under the terms of the contract may be deducted from the cash in the
proceeds of sale of the Securities/Bank Guarantee to deposited (which the officer or person to
whom the same may be endorsed as aforesaid is hereby authorized to sell / to en cash for that
purpose) or from the interest of any such securities of from any sums due or which may become
due to the contractor by the GSECL or from the whole or the balance unpaid as aforesaid of the
encash securities so deposited being repaid or transferred and returned as may be to contractor
after the expiry of the date up to which the contractor has to maintain the work in good order.
In addition to the security deposit at specified rate mentioned elsewhere, the contractor shall pay
in the form of bank guarantee an amount equal to 10% of the contract value towards
performance guarantee of the structure for five years from date of completion of the work.
3.0 COMPENSATION FOR THE DELAY
The time limit allowed for carrying out the work as entered in the tender shall strictly observed by
the contractor and shall be reckoned from the date on which the order to commerce the work is
given to the contractor. The work shall throughout the stipulated period of contract the proceeds
with due diligence (time being deemed to be essence of contract) and for delay, the contractor
shall pay compensation, an amount equal to half percent per one week for the contract amount
of work. However, the total amount of compensation to be paid by the contractor, under the
provision of the clauses shall not exceed 10 [Ten] percent of the amount of contract value as
decided by the competent authority of the GSECL. The penalty will be invariably deducted from
the bills of the contractor and no refund will be given unless the competent authorities approves
the reduction the reasons for delay attributable to GSECL as well as to party will be brought out
clearly while putting the proposal for waiver reduction in penalty.
4.0 ACTION WHEN WHOLE OF SECURITY DEPOSIT IS FORFEITED
In any case in which under any clause or clauses of this contract the contractor shall have
tendered himself to pay compensation amounting to the whole of his security deposit or in the
case of abandonment for the work owing to serious illness or death of the contractor or any other
cause, the Executive Engineer on behalf of the GSECL, shall have powers to adopt, (a) below and
any of the following courses under (b) and (c) as he may deem best suited to the interest of the
GSECL.
4.1 To rescind the contract (for which rescission notice of 10 days) in writing to the contractor under
the hand of the Executive Engineer shall be conclusive evidence and in that case the security
deposit of the contractor shall stand forfeited and absolutely at the disposal of the GSECL.
4.2 To employ labour paid by the GSECL, to supply materials to carry out of the works or any part of
the works debiting the contractor with the cost of the labour and the price of the materials (as to
the correctness of which cost and price the certificate of the Executive Engineer shall be final and
conclusive against the contractor) and crediting him with value of the work done, in all respects in
the same manner and at the same rates as if it had been carried out by the contractor under the
terms of this contract and in that case the certificate of the Executive Engineer as to the value of
the work done shall be final and conclusive against the contractor.
4.3 To order that the work of the contractor be measured up and to take such part thereof, as shall
be unexecuted, out of his heads and to give it to another contractor to complete, in which case,
any expenses, which may be incurred in excess of the sum, which would have been paid to the
original contractor, if the whole work had been executed by him as to the amount of which
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excess expenses the certificate in writing of the Engineer-In-Charge shall be final, conclusive and
shall be borne and shall be paid by the original contractors and shall be deducted from any
money due to him by the GSECL under the contract or otherwise from his security deposit of the
proceeds sale thereof or a sufficient part thereof.
4.4 In the event of the above courses being adopted by the Executive Engineer the contractor shall
have no claim to compensation for any loss sustained by him by reason of his having purchased or
procured any materials or entered into any engagements or made any advances on account of or
with a view to the execution of the work or the performance of the contract. And in case the
contract shall be rescind under the provision aforesaid, the contractor shall not be entitled to
recover or be paid any sum for any works thereof actually performed by him under this contract
unless and until the Executive Engineer shall have certified in writing the performance of such
works and the amount payable to him in respect thereof and he only be entitled to be paid the
amount so certified.
5.0 NOTICE FOR UNSATISFACTORY PROGRESS
If the progress or a particular portion of the work is unsatisfactory the Executive Engineer whose
decision shall be final, shall notwithstanding that the general progress of work is satisfactory; be
entitled to take action under Clause 4(c) after giving the contractor 10 days notice in writing and
the contractor will have no claim for compensation for any loss sustained by him owing to such
actions.
6.0 ACTION IN THE CASE OF DEFAULT BY CONTRACTOR
If any case in which any of the powers conferred upon the Executive Engineer by Clauses 4 and 5
hereof, shall have exercised and the same shall not have been exercised, the non exercised
thereof shall not constitute a waiver of any of the conditions hereof and such powers shall not
withstanding be exercisable in any further case of default by the contractor for which, by any
clauses hereof, he is declared liable to pay compensation amounting to the whole of his security
deposit and liability of the contractor for past and future compensation shall remain unaffected in
the event of the Executive Engineer taking action under sub clause (a) or (c) of Clause 4 he may, if
he so desires, take possessions of all or any tools, plants, materials, and stores in such upon the
work or the site thereof belonging to the contractor, or procured by him and intended to be used
for the execution of the work of any part thereof paying for allowing for the same in account at
the contract rates, or in the case of a contract rates not being applicable to current market rates
to be certified by the Executive Engineer whose certificate thereof shall be final. In the
alternative, the Executive Engineer may by notice in writing to the contractor or his clerk of
works, foremen or other authorised agent, require him to remove such tools, plants, materials or
stores from the premises within a time to be specified in such requisition to decisions to the
contractor failing to comply with any such requisition, the decision of the Executive Engineer as to
the expenses of any such removal and the amount of the proceed and expense of any such sale,
be final and conclusive against the contractor.
7.0 EXTENSION OF TIME LIMIT
If the contractor shall desire an extension of the time limit for completion of the work on the
ground of his having been unavoidably hinder in its execution or on any other ground, he shall
apply in writing to the Chief Engineer (G) and the Chief Engineer (G) may, if in his opinion there
are reasonable grounds for granting extension, recommend such extension as he may think
necessary or proper. The decision of the competent authority in this regard shall be final and
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binding to the contractor. Any delay attributed to GSECL shall be compensated only by way of
extending the limit.
8.0 COMPLETION CERTIFICATE
On completion of the work the Contractor shall be furnished with Completion Certificate by the
Executive Engineer of such completion but no such certificate shall be given nor shall be the work
considered to be complete until works are taken over and/or duly tested and put to operative as
the case may be, nor until the work shall have been measured by the Engineer-In-Charge or
where the measurement have been taken by his subordinated until they have received the
approval of the Executive Engineer the said measurement being binding and conclusive against
the contractor.
9.0 EFFECT OF THE CERTIFICATE
No payment shall be made for any work estimated to cost less than Rs.1,000/- till after the whole
of said work shall have been completed and certificate of completion given. But in the case of
works estimated to cost more than Rs.1,000/- Contractor shall on submitting a monthly bill
thereof, be entitled to receive payments. Proportionate to the part of the work then approved
and passed by the Engineer-In-Charge, whose certificate of such approval and a passing of the
sum so payable shall be final and conclusive against the contract. All such intermediate payments
shall be regarded as payment by way of advance against the final payment only and not as
payments for work actually done or completed and shall not preclude the Engineer-In-Charge
from requiring bad, unsound, imperfect or unskilful work to be removed and taken away and
reconstructed or re-erected nor shall any such payment be considered as admission of the due
performance of the contract or any part thereof in any respect of the accruing of the claim nor
shall conclude, determine or effect in any way the powers of the Engineer-In-Charge as to the
final settlement and adjustment of the accounts otherwise or in any other way, vary or affect the
contract. The final bill shall be submitted by the contractor within one month of the date fixed for
completion of work, otherwise the certificate of Engineer-In-Charge of the measurement and of
total amount payable for the work shall be final and binding on all parties.
10.0 PAYMENT TO CONTRACTORS
The rates for several items of works estimated to cost more than Rs.1,000/- agreed to within shall
be valid only when the item concerned is accepted, having been completed full, in accordance
with the sanctioned specification. In case, where the items of the work, are not accepted, as so
completed the Engineer-In-Charge, may make payment on account of such items at such reduced
rates, as he may consider reasonable in the preparation of final or running accounts bills.
11.0 BILLS
Shall be submitted by the contractor each month on or before the date fixed by the Engineer-In-
Charge, for all works, executed in the previous month and the Engineer-In-Charge shall take or
cause to be taken the requisite measurement for the purpose or having the same verified and the
claim so far as it is admissible, shall be adjusted, if possible, within ten days from the presentation
of the bills. If the contractor does not submit the bill, within the time fixed, as aforesaid, the
Engineer-In-Charge may depute a subordinate to measure up the said work in the presence of the
contractor or his duly authorised agent, whose counter signature in the measurement shall be
sufficient warrant and the Engineer-In-Charge may prepare a bill from such list which shall be
binding on the contractor in all respects.
12.0 SUPPLY OF MATERIALS TO CONTRACTOR
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13.0 WORKS TO BE EXECUTED IN ACCORDANCE WITH SPECIFICATIONS, DRAWINGS, ORDERS ETC.
The contractor shall execute in whole and every part of work in the most substantial and
workmanlike manner and both as regarding materials and in every other respect in strict
accordance with the specification. The Contractor also shall confirm exactly, fully and faithfully to
the designs, drawings and instructions in writing relating to the work signed by the Engineer-In-
Charge and lodged in his office and to which the contractor shall be entitled to have access for
the purpose of Inspection at such office, or in the site of the work, during office hours and the
contractor shall, also if he so requires, be entitled at his own expenses to make or cause to be
made copies of the specification, and of all such designs, drawings and instructions as aforesaid.
14.0 ALTERATION IN SPECIFICATIONS AND DESIGNS NOT TO INVALIDATE CONTRACTS.
The Executive Engineer shall have powers to make any alteration, or addition to the original
specification designs, and instructions that may appear to him to be necessary or advisable during
the progress of the work and the contractor shall be bound to carry out the work in accordance
with any instructions in this connection which may be given to him in writing, signed by the
Engineer-In-Charge and such alterations shall not invalidate the contract. Any additional work
which the contractor may be directed to do in the manner above specified as part of the work
shall be carried out by the contractor on the same conditions in all respect on which he agreed to
do the main works, and at the same rates as are specified in the tender for the main work.
Where, however, the works is to be executed according to the designs, drawing and specifications
recommended by the contractor and accepted by the competent authority, the alteration above
referred to shall be within the scope of such designs, drawings, and specifications appended to
the tender.
15.0 RATES FOR WORKS NOT ENTERED IN ESTIMATE OR SCHEDULE OF RATE OF THE DISTRICT
If the additional and altered work includes any class of work for which no rate is specified in this
contract, then such class of work shall be carried out at the rates entered in the Schedule of Rates
of the Division or at the rate mutually agreed upon between the Executive Engineer and the
contractor, whichever are lower. If the additional or altered work for which no rate is entered in
the Schedule of Rates of the Division is ordered to be carried out before the rates agreed upon
then the contractor within seven days of date of receipt by him of the order to carry out the work
inform the Executive Engineer for the rate which in his intension to charge for such class of work
and if the Executive Engineer does not agree to this rate he shall be noticed in writing be at liberty
to cancel his order to carry out such class of work and arrange to carry it out in such manner as he
may consider advisable provided always that if the rates shall have been determined as lastly
here in before mentioned then in such case he shall only be entitled to be paid in respect of the
work carried out or expenditure incurred by him prior to the date of the determination of the rate
as aforesaid according to such rate or rates as shall be fixed by the Executive Engineer. In the
event of dispute, the decision of the Superintending Engineer of the Circle will be final.
16.0 EXTENSION OF TIME LIMIT IN CONSEQUENCE OF ADDITION OR ALTERATION
The time limit for the work shall be extended in the proportion that the increase in its cost
occasioned by alterations or additions bears to the cost of the original contract work and the
certificate of the Engineer-In-Charge as to such proportions shall be conclusive.
17.0 NO COMPENSATION FOR ALTERNATION IN OR RESTRICTION OF WORK TO BE CARRIED OUT
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If at any time, after the execution of the contract documents the Engineer-In-Charge shall, for any
reason whatsoever, require the whole or any part of the work, as specified in the tender, to be
stopped for any period or shall not require he whole or part of the work to be carried out at all or
to be carried out by the contractor, he shall give notice in writing of the fact to the contractor
who shall thereupon suspend or stop the work totally or partially as the case may be in any such
case, except as provided here under the contractor shall have no claim to any payment or
compensation what so ever on account of any profit or advantage which he might have derived
from the execution, of the work in full but which he did not so derive in consequence of the full
amount of work not having been carried out or on account of any loss that he may be put to on
account of materials purchased or agree to be purchased or for unemployment of labour
recruited by him. He shall not also have any; claim for compensation by reason of any alterations
having been made in the original specification, drawings, designs and instructions which may
involve any curtailment of the work as originally contemplated. Where however, materials have
already been purchased or agreed to be purchased by the contractor before receipt by him of
said notice, the Executive Engineer provided they are not in excess or requirement and are of
approved quality and /or shall be compensated for the loss, if any, that he may put to in respect
of materials agreed to be purchased by him. The amount of such compensation shall be
determined by the Executive Engineer whose decision shall be final. If the contractor suffers any
loss on account of his having to pay, his labour charges during the period, during which the
stoppage of work has been ordered under this clause the contractor shall on application be
entitled to such compensation on account of labour charges as the Executive Engineer whose
decision shall be final, may consider reasonable provided that the contractor shall not be entitled
to any compensation on account of labour charges if, in the opinion of the Executive Engineer,
the labour could have been employed by the contractor elsewhere for the whole or part of the
period during which the stoppage of the work has been ordered as aforesaid.
18.0 NO CLAIM TO COMPENSATION ON ACCOUNT OF LOSS DUE TO DELAY IN SUPPLY OF MATERIALS
BY GSECL
The contractor shall not be entitled to claim any compensation from GSECL for the loss suffered
by him on account of delay by GSECL in the supply of materials entered in Schedule A where such
delay is caused by:
18.1 Difficulties relating to supply of railway wagons
18.2 Force Majeure
18.3 Act of God
18.4 Any other reasonable cause beyond the control of GSECL including Shortage of materials to
be supplied by the GSECLs & difficulties in time by reaching at the site of any materials
equipment.
In the case of such delay in the supply of materials, GSECL shall grant such extension of time for
the completion of the works as shall appear to the Executive Engineer to be reasonable in
accordance with circumstances of the case. The decision in the Executive Engineer as to the
extension of time shall be accepted as final by the contractor.
19.0 TIME LIMIT FOR COMPENSATION CLAIMS
Under no circumstances, whatsoever, shall the contractor be entitled to any compensation from
GSECL on any account unless the contractor has claimed in writing to the Executive Engineer
within one month of the cause thereof.
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20.0 ACTION AND COMPENSATION PAYABLE IN CASE OF BAD WORK
If at any time, before the security deposit is refunded to the contractor, it shall appear to the
Executive Engineer or his subordinate in charge of the work that any work has been executed
with unsound, imperfect or unskilful workmanship or with materials of inferior quality or that any
materials or articles provided by him for the execution of the work are unsound or of a inferior
quality to that contracted for or are otherwise not in accordance with the contract, it shall be
lawful for Engineer-In-Charge to intimate this fact in writing to the contractor and then
notwithstanding the fact that the work, materials or articles complained of, may have been
inadvertently passed, certified and paid for, the contractor shall be bound forthwith to rectify or
remove and reconstruct the work so specified in whole or any part, as the case may require or if
so required shall remove the materials or articles so specified and provided other suitable
materials or articles at his own charge and cost, and in the event of his failing to do so within a
period to be specified by the Engineer-In-Charge in the written intimation aforesaid the
contractor shall be liable to pay compensation at the rate of one percent on the amount of the
estimate for every day, not exceeding ten days during which the failure so continue and in the
event of any such failure as aforesaid the Engineer-In-Charge may rectify or remove and re-
execute the work or remove and replace the materials or articles complained of, as the case may
be, at the risk and expense in all respects of contractor should the Engineer-In-Charge consider
that any such inferior work or materials as described above may be accepted, or made use of, it
shall be within his discretion to accept the same as such reduced rates as he may fix thereof.
Provided that in the case of any work of which visible check is not possible, if the Engineer-In-
Charge or his subordinate in charge of the work feels that such work has been executed with
unsound, imperfect or unskilful workmanship or with materials of inferior quality, he shall take
sample tests at random, cost of which shall have to be borne by the contractor and if after taking
such test, part of such work is found to be defective in any respect or to have been executed with
materials of inferior quality, then the contractor shall be paid for the whole work such amount as
may be fixed by the office of the Engineer-In-Charge on the basis of the lowest quality of work
found by him in such samples tests.
Explanation: I
Sample Test shall mean:
(i) In relation to poles fixed as line supports, the token of one pole out of every 100 poles after
taking it out from its foundation for inspection.
(ii) In relation to any other work, such test as may be considered necessary, by the Engineer-
In-Charge or his subordinate in charge of the work.
Explanation: II
Cost of the sample test shall mean cost incurred for the purpose of taking Samples & test and for
restoring tested work to its original condition.
21.0 WORK TO BE OPENED TO INSPECTION, CONTRACTOR OR RESPONSIBLE AGENT TO BE PRESENT
All works under execution or in course of execution in pursuance of the contract shall at all times
be open to the inspection and supervision of the Executive Engineer and his subordinate and
contractor shall at all times, during the usual working hours and at all other times at which
reasonable notice of the intension of the Executive Engineer or his subordinates to visit the works
shall have been given to the contractor, during which period either he should be present to
receive order and instruction, or have a responsible agent duly accredited in writing, present for
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that purpose. Orders given to the contractor’s duly authorised Agent shall be considered to have
the same force and effect as if they had been given to the contractor himself.
22.0 NOTICE TO BE GIVEN BEFORE WORK IS COVERED UP
The contractor shall give not less than 5 days notice in writing to the Executive Engineer or his
subordinates in charge of the work, before covering up or otherwise placing beyond the reach of
measurement of any work, in order that the same may be measured and correct dimensions
thereof, taken before the same is so covered up or placed beyond the reach of measurement and
shall not covered up or placed beyond the reach of measurement and work without the consent
in writing of Executive Engineer or his subordinate in charge of work, If any work shall be covered
up or placed beyond the reach without such notice having been given or consent obtained, the
same shall be uncovered at the contractor’s expense, and in default thereof, no payment or
allowance shall be made for such work, or for the materials, with which the same, was executed.
23.0 CONTRACTOR’S LIABILITIES
The Contractor shall supply, at his own cost, all materials (except such special materials, if any as
may be supplied form the GSECL stored in accordance with the contract) plant, tools, appliances,
implements, ladders, cordage, tackles, scaffolding and any temporary works which may be
required for the proper execution of the work., in the original, altered or substituted form and
whether included in the specification or other document forming part of the contract or referred
to in these conditions or not and which may be necessary for the purpose of satisfying or
complying with the requirements of the Engineer-In-Charge as to any matter on which under
these conditions, he is entitled to be satisfied or which he is entitled to require together with
carriage thereof to and from the work, the contractor shall also supply without charge, the
requisite number of persons for setting out works, and counting, weighting and assisting in the
measurement of, examinations at the time and from time to time of the work or materials, failing
this, the same may be provided by the Engineer-In-Charge at the expenses of the contractor and
the expenses may be deducted from any money due to the contractor under the contract or from
his security deposit or the proceeds of sale thereof or of a sufficient portion thereof the
contractor shall provide all necessary fencing and light required to protect the public from
accident and shall also be bound to bear expenses of defence of every suit, action or other legal
proceedings of law that may be brought by any person for injury sustained. Owing to neglect of
the above precautions and to pay any damage and costs which may be awarded in any such suit,
action or proceedings to any such persons, or which may with the consent of the contractor be
paid in compromising any claim by any such person.
24.0 CONTRACTOR LIABLE FOR ALL DAMAGES
Compensation for all damage done intentionally or unintentionally by contractor’s labourer,
whether in or beyond the limit of GSECL’s property, shall be estimated by the Executive Engineer,
or such other office, as he may appoint and the estimate of the Executive Engineer, subject to the
decision of the Superintending Engineer, on appeal, shall be final and the contractor shall be
bound to pay the amount of the assessed compensation demand, failing which, the same will be
recovered from the contractor as damages or deducted by the Engineer-In-Charge from any sums
that may be due to or become due from GSECL to the contractor under this contract or
otherwise. The contractor shall bear the expenses of defending any action or other legal
proceedings that may be brought by any person for injury sustained by him owing to neglect of
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precautions to prevent the spread of fire and he shall also pay any damage and costs that may be
awarded by the court if in consequence.
25.0 RESCISSION OF CONTRACT AND FORFEITURE OF DEPOSIT
The contractor shall not assign or sublet, without the written approval of the Engineer-in charge
and if the contractor assign or sublet his contract, or attempt to do so or become insolvent or
commence any proceedings to be adjudicated as insolvent or make any composition with
creditors, attempt to do so, the Engineer-In-Charge may, by notice in writing rescind the contract.
Also, if any bribe, gratuity, gift, loan, perquisite, reward or advantage pecuniary or otherwise shall
either directly or indirectly be given, promised or offered by the contractor or any of his servants,
or agents, or any person to the employee of GSECL in any way relating to his office or
employment or if any such officers or persons shall become in any way directly or indirectly
interested in the contract, the Executive Engineer may, by 10 days notice in writing, rescind the
contract. In the event of a contract being rescinded the Security Deposit of the contractor shall
there upon stand forfeited and be absolutely at the disposal of GSECL and the same
consequences shall ensure as it the contract has been rescinded under clause 4 thereof and in
addition the contractor shall not be entitled to recover or be paid for any work thereof actually
performed under the contract.
26.0 COMPENSATION
All sums payable by a contractor by way of compensation under any of these conditions shall be
considered as a reasonable compensation to be applied to the use of GSECL, without reference to
the actual loss or damage sustained and whether any damage has not been sustained.
27.0 CHANGE IN THE CONSTITUTION OF FIRM TO BE NOTIFIED
In the case of tender by partners of a firm, any change in the constitution of firm shall be
forthwith notified by the contractor to the Executive Engineer for his information.
28.0 WORKS UNDER DIRECTION OF SUPERINTENDING ENGINEER
All works to be executed under the contract shall be executed under the direction and subject to
the approval of the Superintending Engineer of the Circle, Engineer-In-Charge for the time being
who shall be entitled to direct at what point or points and in what manner they are to be
commenced and from time to time carried on.
29.0 DECISION OF SUPERINTENDING ENGINEER TO BE FINAL.
Except where otherwise specified in contract and subject to the power delegated to him by GSECL
under the GSECL’s rule, then in force the decision of the Superintending Engineer of the Circle /
Engineer-In-Charge. for the time being shall be final, conclusive and binding on all of the
specification, designs, drawings and instructions herein before mentioned and as to the quality of
workmanship or material used on the or as to any other question, claim, right matter or thing
whatsoever in any way arising out of or relating to the contract, designs, drawings, specifications,
estimates, instructions, orders or these conditions or otherwise concerning, the works or the
execution or failure to execute the same, whether arising during the progress of the work or after
the completion or abandonment thereof.
30.0 ARBITRATION
‘ALL QUESTIONS, DISPUTES OR DIFFERENCES, WHATSOEVER WHICH MAY AT AN TIME ARISE
BETWEEN THE PARTIES TO THIS CONTRACT IN CONNECTION WITH THE CONTRACT OR ANY
MATTER ARISING OUT OF OR IN RELATION THERE TO, SHALL BE REFERRED TO THE “GUJARAT
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PUBLIC WORKS CONTRACTS DISPUTES ARBITRATION TRIBUNAL” AS PER THE PROVISIONS OF THE
GUJARAT PUBLIC WORKS CONTRACTS DISPUTES ARBITRATION TRIBUNAL ACT, 1992.
31.0 STORES TO BE OBTAINED FROM GSECL
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32.0 LUMP SUM IN ESTIMATE
When the estimate on which tender is made, includes lump sums in respect of parts of the works
the contractor shall be entitled to payment in respect of the items of works involved or the part
of the work in question at the same rates as are payable under this contract or such items or if
the part of work in question is not in the opinion of the Engineer-In-Charge capable to
measurement the Engineer-In-Charge may at his discretion pay the lump sum amount entered in
the estimate and the certificate in writing of the Engineer-In-Charge shall be final and conclusive
against the contractor with regard to any sum or sums payable to him under the provisions of the
clause.
33.0 LUMP SUM TENDERS
Whenever lump sum tenders have been invited for building or other structures of the same type,
design, the contractor shall submit his bill stated in Clause No.11 and the Engineer-In-Charge not
below the rank of Executive Engineer shall certify by general measurement or by other method
considered suitable to him, the value of work done and the contractor shall be paid monthly a
sum equal to 90% of the total value the work so certified, since the last payment, after deducting
a part or whole of the secured advance if not already paid for the materials utilised on the works.
An additional secured advance for any fresh materials brought on site will also be paid if certified
by the officer not below the rank of Executive Engineer. After the work is completed final bill
would be paid on the certification of officer not below the rank of Executive Engineer, that the
work is done according to drawing and specifications attached to the tender. If any additions and
alteration have been carried out, detailed measurements in respect thereof shall be recorded and
extra payment or deductions are regulated as per item rates quoted by the contractor while
submitting the tender and if there are any items in the additions and alterations for which the
contractor has not quoted a rate, the payment shall be as per Clause 15 above.
34.0 ACTION WHERE NO SPECIFICATIONS.
In the case of any class of work for which there is no such specifications as is mentioned in clause
1. such work shall be carried out in accordance with the divisional specifications and in there
event of there being no divisional specifications, the work shall be carried out in all respects in
accordance with the instructions and requirements of the Engineer-In-Charge / consultant of the
GSECL etc.
35.0 INDUSTRIAL LABOUR LAWS
35.1 Wages to be paid and time of payment etc. by the Contractor
1) The contractor shall pay Rs.210.90/- per day as per prevailing norms or as may be specified
hereafter or fixed under minimum wages Act whichever is higher. The wages of every contract
labour employed by him under this contract shall be paid by him before the expiry of 7th day of
the last day of the month in respect of which the wages are payable (i.e. wages of a month have
to be paid by him in the first week of the next month). The payment shall be disbursed in
presence of Management Representative during the working hours in factory premises and the
contractor shall get the entries certified in the register of wages by the Representative of the
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GSECL. Any default will result in cancellation of contract forthwith or else the contractor shall be
punishable to the extent of Rs.100/- fine per each day.
2) The contractor shall give his telephone number and address to the GSECL so that in case of labour
trouble etc., the contractor can be contacted. The contractor shall arrange to have his office
outside the factory premises and the contractor keep himself present throughout the working
hours.
35.2 Labour Laws
1) Person below the age of 18 years shall not be employed for the work.
2) No female worker shall be employed in the night shift between 7.00 p.m. to 6.00 a.m.
3) Contractor shall maintain a valid labour license under the Contract Labour
(Regulation and Abolition Act) for employing necessary manpower to be required by him. In the
absence of such license the contractor shall be liable to be terminated without assigning any
reason thereof.
4) The contractor shall at his own expense comply with all labour laws and keep the GSECL
indemnified in respect thereof. Some of the major liabilities under various labour and industrial
laws which the contractor shall comply with are as under:
a) Payment of contribution of wages of employers contributions towards Provident Fund, Family
Pension Scheme, Deposit Linked Insurance Scheme, Administrative Charges etc. at the rates made
applicable from time to time by Government of Gujarat / Government of India or other Statutory
Authorities.
b) Payment of deposit in respect of each contract labour of the rate of RS.30/- with the office of the
Commissioner of Labour as per the Contract Labour Act (Regulation & Abolition).
c) Licence Fee as prescribed under the contract Labour Act (Regulation and Abolition) and Rules
framed there under depending upon the number of workmen employed by the contractor.
d) Paid leave facility and wages as per the provision of the Factories Act at the rate of one day for
every 5 days of working.
e) Identity cards as prescribed under the factories Act with photo affixed thereto, the same for
identification.
f) Payment of retrenchment compensation, notice pay and other liabilities as per Industrial Disputes
Act. Any payment to the contractor’s employees arising out of any claim of disputes under the
Industrial Disputes Act – 447 or any other laws.
g) Provision of compensation in the case of accidental injury.
h) Payment of crèche if the female labour employed is more than 30 numbers
i) Maternity leave as per the provision of the Maternity Benefit Act.
j) The above are some of the major liabilities of the contractor in addition to other liabilities
prescribed under the various Labour Las in force from time to time from Statutory Authorities like
State Government / Government of India which the contractor shall have to comply with.
35.3 Provident Fund And Family Pension Scheme
The contractor shall submit along with his bill (month wise) a statement regarding deductions
against employees provident fund and family pension scheme in respect of each concerned
employees. Provident fund and family pension scheme at the rate of 12 % (or at the rates made
applicable by the Government from time to time) of the wages. The contractor’s contribution
and his workers contribution towards provident fund and family pension scheme shall be
deposited by the contractor with regional Provident Fund Commissioner, Ahmedabad.
35.4 Deposit Linked Insurance Scheme:-
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The contractor shall have to deposit ½ % of the wages in-respect of employees who is a member
of the Provident Fund as the contribution to the Deposit Linked Insurance Scheme with Regional
Fund Commissioner, Ahmedabad.
35.5 Administrative Charges:- Administrative charges for maintaining Provident Fund Account shall
be deposited by the contractor with Regional Provident Fund Commissioner, Ahmedabad at the
rates applicable.
35.6 Paid Leave Facility : Paid leave facility at the rate of one day for every 5 days worked by the
contract labourer shall be provided by the contractor to his workers. He shall maintain Leave
records/ Leave Cards for individual labourer which shall be duly verified and approved/ certified
by the authorized officer of the GSECL.
35.7 Workmen’s Compensation Fund And Employers Liability Insurance:-
The contractor shall cover all his employees under Workmen’s Compensation Fund and under
the Liability Insurance.
35.8 The contractor shall employ adequate number of experienced staff at site for daily supervision
and for maintenance of various registers and records required under the law and contract. No
payment for supervision shall be admissible.
35.9 Contractor To Indemnify The GSECL The contractor shall indemnify and keep indemnified the
GSECL and every officer and employees of the GSECL and also Engineer-In-Charge and his staff
against all actions, proceedings, claims, demands, costs and expenses whatsoever arising out of
or in connection with the matters referred in above clauses and elsewhere and against all
actions, proceedings, claims, demands, costs and expenses which may be made against the
GSECL by any workman/ employee of the contractor or any sub-contractor and / or from any
liability may arise to any workman / employees of the contractor or any sub-contractor under
any laws, rules or regulation having the force of law including but not limited to claims against
the owner under workman’s compensation Act, 423. The employee’s Provident Act 452, and /
or the contract Labour (Abolition and Regulation) Act 479. The GSECL shall not be liable for or in
respect of or in consequence of any accident or injury to any workmen or other person in the
employment of the contractor or his sub-contractors, and the contractor shall indemnify and
keep indemnified the GSECL against all such damage and compensation and against all claims,
demands, proceedings costs, charges and expenses whatsoever in respect thereof or in relation
thereto.
35.10 Workmen’s Compensation And Employer’s Liability Insurance:-
Insurance shall be effected for all the contractor’s for all the contractor’s employees engaged in
the performance of this contract. If any of the work is sublet to the sub-contractor, the
contractor shall require that he or his sub-contractor to provide workmen’s compensation and
employer’s liability insurance for the latter’s employees unless such employees recovered under
the contractor’s insurance.
35.11 The GSECL reserves the right to terminate this rate contract at any time during its pendency
without giving notice of termination or any reasons thereof.
35.12 The GSECL will be entitled to deduct directly from the bills, to be paid to the Sub-contractor and
Labourers any sum or sums payable by contractor and which sum/sums the GSECL is required to
pay as a principal employer on account of contractor’s default in respect of all liabilities referred
to in above clauses.
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35.13 Nothing in the contract document stated shall any wise constitute any workmen/ employees of
the contractor or any sub-contractor as or to be workmen/employee of the power, or place
obligation or liability in respect of any such workmen/ employee upon the GSECL.
NOTE: The prevailing Act at the time of execution of work over and above act specified herein
shall be binding to the contractor.
36.0 NO CLAIM FOR VARIATION IN QUANTITIES OF WORK
Quantities shown in the tender are approximate and no claim shall be entertained for quantities
of work actually executed, being either more or less up to any extent than those entered in the
tender or less than those entered in the tender or estimate.
37.0 NO CLAIM FOR COMPENSATION FOR DELAY IN STARING WORK
No compensation shall be allowed for any delay caused into starting of work on account of
acquisition of land and in the case of clearance for works or any delay in according sanction to
estimates.
38.0 NO CLAIM FOR COMPENSATION FOR DELAY IN EXECUTION OF WORK
No compensation shall be allowed for any delay in execution of the work on account of water
standing in borrow pits or compartment. The rates are inclusive for hard or cracked soil,
excavation in mud, sub-soil water or water standing in borrow pits and no claim for an extra rate
shall be entertained unless otherwise expressly specified & mentioned in the tender.
39.0 ENTERING UPON OR COMMENCING ANY PORTION OF WORK
The contractor shall not enter upon or commence any portion of work except with the written
authority or instructions of the Executive Engineer or his subordinate in charge of the work,
failing such the contractor shall have no claim to ask for measurement or payment for work.
40.0 METHOD OF PAYMENT
Payment to contractors shall be made by A/c payee cheques provided the amount exceeds
Rs.50/-. Amount not exceeding Rs. 50/- will be paid in cash. Payment shall be made after 30 days
from recording of the bills.
41.0 ACCEPTANCE OF CONDITIONS ON TENDERING FOR WORK.
Submission to tender or acceptance of work order shall imply acceptance of these conditions of
tender by contractor.
42.0 EMPLOYMENT OF SCARCITY LABOUR
If government declares a state of scarcity or famine to exist in any village situated within 5kms of
the work, the piece worker / contractor shall employ upon such part of the work as are suitable
for unskilled labour; any person certified to him by the Executive Engineer or by any person to
whom Executive Engineer may have delegated this duty in writing to be in need of relief and shall
be bound to pay such person wage not below the minimum, which Government may have fixed in
this behalf from time to time. Any implementation of this clause shall be decided by the
Superintending engineer / Engineer-In-Charge whose decision shall be final and binding on the
piece worker/contractor.
43.0 EMPLOYMENT OF TECHNICAL PERSONS
The contractor who are registered under class ‘A’, ‘B’ and ‘C’ or such contractors who executes
the works of Rs. 5 lakhs and above shall employ the technically qualified personnel possessing
minimum a Diploma of reconciled Technical institution, for executing the work of the GSECL.
Date: (Signature of Contractor) Chief Engineer (G)
GSECL, KLTPS
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SPECIAL CONDITIONS OF CONTRACT
1.0 The successful bidder, on receipt of Letter of Intent will submit within a week’s time his
planning/program of work for the scrutiny of the GSECL in a PART/BAR CHART format, clearly
indicating the GSECL’s inputs also.
2.0 Contractor will plan his work such that the works on all the fronts released by the GSECL,
simultaneous works should progress in such a way that the entire job is completed in the
schedule time limit.
3.0 The work commencement date will start from the date of issue of letter of commencement.
4.0 The successful bidder will have to depute his authorized representative to attend progress review
meeting to be held at site or the GSECL’s C.O., at Vadodara.
5.0 The contractor will be responsible for complying with all rules & regulation & the labour laws
applicable to him & the GSECL will not be responsible for any lapses committed by them. If there
is any claim from the Government Authority pertaining to the contractor the same amount will be
deducted from the contractor’s bill.
6.0 The contractor shall depute sufficient numbers of qualified engineers / supervisors to look after
the work. The engineers/supervisors shall remain present at site at all the times. In no
circumstances, contractor shall be allowed to continue work without engineering supervision.
Chief Engineer (G)
GSECL, KLTPS
I/We accept the above conditions…
Contractor’s Representative legible signature:
_______________________________________________________
Name of the person:
__________________________________________________________________________________
Seal of the Company: _______________________________Date & place:
___________________________________________
Signature of contractor
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GENERAL CONDITIONS OF CONTRACT
1.0 CONTACTOR TO INFORM HIMSELF FULLY
The contractor shall be deemed to have carefully examined the work & site conditions, the general
conditions, the special conditions, specifications, schedules & drawings & shall be deemed to have visited
the site of the works & to have fully informed himself regarding the local conditions. Copy of Appendix V
attached with tender shall have to be filled up before quoting the rate, for confirmation of site visit. If
there shall have any doubts as to the meaning of any portion of these general conditions or special
conditions of the scope of work of the specifications or any other matter concerning the contract, he shall
in good time before submitting his tender, send for the particulars thereof & submit them to the
Engineer-In-Charge in writing in order that such doubt may be removed.
2.0 ERRORS, OMISSIONS & DISCREPANCIES
In all cases of errors, omissions, doubts or discrepancies in the dimensions, or discrepancies in the
drawings & items of work on specifications, reference shall be made to the Executive Engineer whose
elucidation & elaboration shall be considered as authoritative. The contractor shall be held responsible
for any error that may occur in the work thorough lack of such reference.
3.0 USE OF LAND
3.1 The area if available will be allocated for construction of site office& store godown only.
3.2 The contractor shall preserve all existing vegetation such as trees on or adjacent, to the works
sites which do not interfere with the construction as determined by the GSECL.
3.3 The contractor shall take all possible precautions in felling trees authorized for removal to avoid
any unnecessary damage to vegetation & trees not to be felled & to structures or to workmen, & shall be
responsible for any damage if it occurs in such operations.
3.4 All produce from cutting of trees, grass etc. shall be the property of GSECL & shall be stacked at
the directed places. No claim shall be made for such tree felling / cutting &stacking of trees/produce or
grass etc. by the contractor.
3.5 The contractor shall not unnecessarily or for use as fuel, cut any trees, bushes, grass or other
vegetation nor shall set fire.
3.6 The land shall as herein before mentioned be handed over to GSECL / Owner of Land
immediately after the completion of the work under this contract. Also no land shall be held by the
contractor longer than the GSECL shall deem fit & necessary & the contractor shall, on due notice by the
GSECL, vacate & return the land which the Engineer-In-Charge may certify as no longer required by the
contractor for purposes of the work.
4.0 START OF WORK
The contractor shall not enter upon or commence any portion of the work except with the written
permission of the authority of the GSECL, failing which the contractor shall have no claim to ask for
measurement of or payment for work & shall be responsible for any claims or damages that may arise
due to such unauthorized commencement or entry. No compensation shall be allowed for any delay
caused in starting the work on account of any delay in clearance of the work site.
5.0 WORK TO EXECUTE TO THE SATISFACTION OF THE GSECL’S ENGINEERS
The contractor shall proceed with the work with diligence & expedition & the whole of the work herein
specified as well as the mode of execution shall be under the supervision & the direction & shall be
carried on to the entire satisfaction of the GSECL’s site Engineers, who shall have full powers to order the
contractor to alter, enlarge or diminish the form, dimensions, positions, or quantities of any of the work
or to make use of materials & workmanship of different descriptions & qualities from this herein
specified. In the case of any class of work for which there are no Technical Specifications, these shall be
carried out in accordance with the latest IS Codes & in the event of being no Relevant IS Code, the works
shall be carried out in accordance with the directions & instructions of the GSECL’s Engineers at site.
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6.0 WORKMANSHIP ETC.
The work shall be executed in thoroughly substantial manner with workmanship of best quality & strictly
in accordance with the specifications & with the drawings, or with such other drawings or written
instructions as may from time to time be furnished to the contractor, in accordance with terms of this
contract & shall be completed in every respect with workmanship implied & necessary according to the
fair interpretation & meaning of the same & should there be any discrepancy between the drawings &
specifications or any difference or dispute as to the dimensions to be worked out or the mode of doing
periodical quantity of the work to be executed or with respect to any subject arising out of this contract,
the decision of the GSECL’s authorized Engineers shall be final & binding on all parties.
7.0 SAMPLES OF DESCRIPTIVE DATA
Samples of descriptive data requiring approval shall be submitted by the Contractor to the GSECL’s
Engineers in good time before the use of such material to permit its inspection & testing & there-by the
approval. The samples shall be properly marked to show the name of material, manufacture place or
origin & the place where it is intended to be used etc. Failure of any samples to pass specified tests
requirements; it shall be sufficient cause for the refusal to consider any further samples from that source.
8.0 BASELINES & GRADES
The GSECL near to the site of work shall furnish one permanent Bench Mark. Semi-permanent baselines &
cross lines shall be established at sufficiently spaced intervals with benchmarks by the Contractor at his
own cost & risk. The contractor shall provide at his expense, all the required pillars, equipment, materials,
& labour for the establishment of the grade lines & bench marks, for that the Contractor shall be
responsible for their further maintenance during the execution of the actual work till the complete period
of construction. The contractor shall be responsible for the proper execution of work to such lines &
levels & grades as may be specified in the drawings, established, or indicated by the GSECL’s Engineers.
All the survey work, if required, shall be checked by the GSECL’s engineers. However this shall not absolve
the contractor for the correctness of survey/ temporary or permanent Benchmarks.
9.0 CONTACTOR NOT TO DISPOSE OFF SOIL ETC.
The contractor shall not sell or otherwise dispose off or remove except for the purpose of this contract
the sand, ballast, earth, rock or other substances or materials that may be obtained from any execution
made for the purpose of this contract or produce upon the site at the time of delivery of the possession
of the land but also such substances materials & produce shall be the property of the GSECL & shall be
disposed off in the manner & place as directed by the GSECL’s Engineers.
10.0 GOLD, SILVER, MINERALS, OIL RELICS, ETC. FOUND ON THE SITE
All gold silver, oil relics, or other minerals, of any description & all precious stones, coins, treasures relic,
antiquities, & other similar things that shall be found in or upon the site shall be the property of the
GSECL. The contractor shall return the gathered things as above to the authorized representative of the
GSECL.
11.0 FENCING, LIGHTING & VENTILATION
The contractor shall be responsible for the proper lighting, fencing, guarding & taking of all the necessary
safety measures for all works comprised in the contract & or the proper provision of temporary
roadways, footways, guards fences, caution notices etc. as far as the same may be rendered necessary by
reasons for the work for the accommodation & protection of workmen foot passenger or other traffic &
of the GSECL & occupiers of adjacent villages, property of the public & shall remain responsible for any
accidents that may occur on account of his failure & timely precautions.
All the works & approaches shall be adequately illuminated with electric lights to the satisfaction of the
GSECL’s Engineers. The power & lighting connections, wiring equipment shall be subject to the inspection
& passing by Electrical Inspector to GOG authorized under the Indian Electricity Act. Any additions
alterations or omissions shall be got approved from the GSECL’s Engineers got certified from the Electrical
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Inspector. Work spots such as faces of excavation of borrow pits; filling area etc. shall be adequately
illuminated with floodlights to the satisfaction of the GSECL’s Engineers.
12.0 EXPLOSIVE PROCUREMENT & STORAGE
Explosives, petrol, oils, fuels, &other inflammable materials shall be stored strictly in accordance with the
rules of the Explosive Department. The contractor shall at his own expense construct & maintain proper
magazines which are required for the storage of explosive & arrange for storage facilities for oils, petrol,
fuels etc. for use in connection with the work.
The contractor shall at his own cost obtain the necessary license for the storage & use of explosives, oils,
petrol, diesel etc. The GSECL shall not take any responsibility whatsoever in connection with the storage
or use of explosives on the site, any accident occurs in the connection at site or nearby village or vicinity.
All operations of the contractor in which or for which explosives are employed shall be at the risk of the
contractor & upon his own responsibility.
13.0 LIABILITY FOR ACCIDENTS TO PERSONS:
13.1 The contractor or subcontractor shall indemnity the GSECL against any claims which may be
made under the workman’s compensation Act, 423, or any statutory modification or otherwise for or in
respect of any damages or compensation payable in consequence of any accident or injury caused, by
fault of contractor or subcontractor & sustained by any workmen or other person on the employment of
the contractor or subcontractor. In every case in which by virtue of the provisions of subsection (1) of
section 12 of the workman’s Compensation Act, 423, the GSECL is obliged to pay compensation to a
workman employed by the contactor or subcontractor in execution of the work, the GSECL will recover
from the contractor the amount of compensation so paid, and without prejudice to the rights of the
GSECL under subsection 12 of the said Act, such amount will be paid back to the GSECL in 30 days, failing
which the GSECL will be at liberty to recover such amount of any part thereof by deducting it from the
dues by the GSECL to the contractor under this contract or otherwise. The GSECL shall not be bound to
contract any claim made against either of them under section 12, subsection (1) of the said Act, except on
written request from the contractor & upon his giving to the GSECL full security for all costs for which the
GSECL might become liable in consequence for entertaining such claims.
13.2 The contractor and/or subcontractor named in the contract shall indemnity the GSECL against
all claims based upon injury or death to any person in the employment of the contractor or sub contactor,
or to the third parties under paragraph (a) 2 or condition no.47 to the extent of any sums recovered
under the insurance policy.
13.3 On occurrence of the accident which result on the death of workman employed by the
contractor or subcontractor, which is so serious as to be likely to result in the death of any workman, the
contractor shall within 24 hours of happening of such event intimate in writing to the Engineers of the
GSECL the fact of such accidents. The contractor or subcontractor shall indemnity the GSECL against all
loss or damage sustained, by the GSECL resulting directly or indirectly from his failure to give intimation in
the manner aforesaid including penalties or fine if any, payable by GSECL as a consequence of GSECL’s
failure, to give notice under workman’s compensation Act or otherwise to confirm to the provisions of
the said Act in regard to such accident.
14.0 LIABILITY FOR DAMAGE TO WOKS & MATERIALS
14.1 The contractor shall during, the progress of the work, properly protect the works & the existing
Ash Disposal pipelines & materials placed at his disposal or acquired for him by the GSECL, & shall remain
answerable & liable for all accidents, damages. Loss etc. & shall be made good in the most complete &
substantial manner by & at the sole cost of the contractor & to the reasonable satisfaction of the GSECL’s
Engineers. If the contractor fails to make good such losses, damages within the specified time given by
the GSECL, the GSECL shall be at liberty to recover the amount towards such expenses fixed by the
GSECL’s Engineers & shall be recovered from the amount due under this contract to the contractor.
14.2 Further the contractor shall, at all times, protect & preserve all materials, machinery,
equipment, Ash Disposal pipelines, allied structures such as spillway chambers, ADP, haul road and ramps
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etc., materials & so acquired by himself or GSECL for the execution of the work. All reasonable requests of
the GSECL’s Engineers to enclose or especially protect any of the above shall be expeditiously complied
with at no extra cost.
14.3 If the Engineer considers that the work, asked for in the aforesaid Para, is not sufficiently &
satisfactorily protected by the contractor, on requests made for, the GSECL shall be entitled to arrange
for such protection at his unfettered discretion & recover the cost thereof from the contractor.
14.4 Until the work shall be or deemed to be taken, over as aforesaid, the contractor shall also be
liable for & shall be deemed to have indemnified the GSECL in respect of all damage or injury to any
person or any property of the GSECL or of others in villages nearby, occasioned by the negligence of the
contractor or his workmen, or his subcontractor, or by defective /ill methods of working.
15.0 MATERIALS, TOOLS, MACHINERY BROUGHT ON THE SITE OF WORK
All materials, tools & tackles, machinery etc. of the contractor brought to & delivered upon the site for
the work shall be the time of their being so brought shall be deemed to be the property of the GSECL in
its possession to be used for the purpose of the work & for that purpose only & shall not on any account
be removed or taken away by the contractor or any other person without the permission of the GSECL’s
Engineers in charge, but the contractor shall be fully responsible for & loss, destruction thereof or
damage thereto. The GSECL may have a lien on such materials, tools, tackles, machinery for any sum or
sums which may at any time prior to the completion of the works be or owing to the GSECL by the
contractor, under in respect of & dispose of any such materials, tools. Tackles, machinery in such a
manner as the GSECL may think fit & to apply the proceeds in or towards the satisfaction of such sum or
sums due or owing as aforesaid but subject to such lien & power of sale & disposal such surplus materials,
tools, tackles, machinery shall belong to the contractor & may be removed & disposed off by him as he
may think fit.
16.0 ACCESS TO SITE & WORK ON SITE
The Engineer or his authorized representative may if he considers fit from time to time enter upon any
lands which may be in the possession of the contractor under this contract, for the purpose of executing
any work not included in this contract & may execute by other contractors at his opinion & the contractor
shall in accordance with the requirements of the Engineer, afford all reasonable facilities for execution of
the works including occupation of lands by structure or otherwise for any other contractor employed by
the GSECL & his workmen or for the execution on or near site of the works not included in the contract.
The contractor shall not be entitled for any extra claims on such executions.
17.0 INSPECTION OF WORKS
The GSECL’s Engineers or their authorized representatives shall have at all times power to inspect the
works, wherever in progress, either on site, on the contractor’s premises in connection with this contract.
Further, the contractor shall not allow any person other than GSECL’s Engineers or their authorized
representatives to the work sites. The contractor shall, during working hours, maintain supervisors of
sufficient training & experience to supervise the work as a whole. All orders & directions given to such
supervisors or other staff shall be deemed to have been given to the contractor. Further the GSECL may
by due notice, desire a high ranking member of the supervisor staff of the contractor to be present on any
specified inspection & the contractor shall comply with such directions.
18.0 CLEANING UP
18.1 The contractor shall at all times keep the construction areas & his labour colony & storage areas
free from accumulation of waste, or rejected materials.
18.2 Prior to the completion of the work the contractor shall remove all rubbish from & about the
premises, & tools, tackles, machinery, left out materials consumable, rejected materials, scaffolding etc.
which are not the part of the permanent work/structure. The premises will be left fully satisfactorily to
the GSECL’s Engineers/representatives; thereafter only the completion certificate will be issued.
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19.0 CONTRACTOR’S INVENTORY OF EQUIPMENTS & MACHINERY
The contractor shall prepare & maintain an inventory of all machinery, equipment, temporary rolling
stock, and plant purchased or hired for the use of this contract’s execution.
20.0 PROGRESS SCHEDULE
20.1 Contractor shall furnish a Construction Schedule on receipt of LOI or Work Order whichever is
earlier, in quadruplicate, indicating the date of start, the monthly progress expected to be achieved &
anticipated completion of each major items of the work under this contract & procurement of
equipment, machinery & other materials. The schedule should be such as is practicable of achievement
the whole work in the time limit & of the particular items on due date specified in the contract & shall
have the approval of the GSECL’s Engineers. Detailed schedules for each working season showing the
progress month by month to be achieved is to be submitted to the GSECL. The GSECL is empowered to
ask for more detailed progress schedule week by week for any item or for all items & the contractor shall
comply when asked for.
20.2 The GSECL shall have, at all times the right without in any way violating this contract, or forming
grounds for claim to alter the order of the works or any part thereof & the contractor shall after receiving
such direction proceed in the order directed. The contractor shall revise the progress schedule
accordingly & submit to the GSECL in four copies.
20.3 The contractor shall furnish sufficient machinery, equipment, labourers & materials shall work
for such hours & shifts as may be necessary to maintain/achieve the progress of the scheduled, after
getting written permission of Engineer-In-Charge.
20.4 The progress schedules shall be in the form of bar charts, statements &/or reports as may be
necessary & directed by the GSECL’s representatives.
21.0 RECOVERIES
Recoveries due from the contractor, up to the end of the month previous to the one in which the bill is
prepared shall be made from bills approved for payment every month or at other periods when the bills
are prepared, for the enlisted, but not limited to, in the order of priorities & extents.
21.1 Penalty, if leviable,
21.2 Expenditure, in full, incurred by the GSECL on contractor’s behalf in labour, machinery,
equipment etc.,
21.3 Charges for services such as water & power supply, etc. in full,
21.4 Hire charges for GSECL’s or Government machinery if any,
21.5 Other recoveries not specifically mentioned but recoverable.
22.0 DATE OF COMPLETION
The contractor shall complete the whole work & hand over to the GSECL on or before the date specified
in the work order.
Provided always that if in the opinion of the GSECL the completion of the works shall be delayed by any
change of original design or by the order of the GSECL, of any altered, modified substituted or additional
works or materials omitted or by strikes, lock outs or stoppages of labour, or revolution, riots, civil or
political disturbance or by the contractor not being given possession of the site or by the GSECL taking
possession of & using the site or part thereof or the works or part thereof or any part of the work or
delayed supply of material by the GSECL or by the not receiving any orders, drawings, instructions or
directions in time or by the suspensions if the works or by fire, flood exceptionally bad weather tempest,
storm or by from unforeseen circumstances(& whether the same shall be due to any act or omission of
the GSECL or it’s representatives) the GSECL may in the unfettered discretion thinks fit either forthwith or
at a later time & from time to time not withstanding that the prescribed or extended time for completion
has expired or work have been completed, extend the date for the completion of the works to such a
date as deemed fit as practical & acceptable.
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23.0 SUBLETTING OF CONTRACT
There will be generally no objection on the component parts if the work, being given over to responsible
subcontractors but GSECL shall under no circumstances recognize these subcontractors & the
responsibility of executing the work in the accordance with the conditions of contract will entirely rest on
the main contractor. However written consent of C.E (G) shall be obtained before subletting. The main
contractor will therefore always have the very responsible member, preferably a technical hand present
on the works with power to sign all work orders issued on the site of work & to take requisite actions in
the interest of efficient execution of work.
24.0 OTHER CONTRACTS FOR THE SUSPENSION STOPPAGE OR CURTAILMENTS OF WORK
If during the pendency of the contract the Engineer shall for any reason (which shall be unquestioned)
whatsoever require the whole or any part of the work as specified in the contract to be suspended for
any period or shall not require the whole or any part of the work as specified in the contract to be carried
out at all by the contractor, he shall give notice in writing of the fact to the contractor who shall
thereupon suspend or stop the work totally or partially as the case may be. In any case except as
provided hereunder, the contractor shall have no claim to any payment or compensation whatsoever on
account of any profit or advantage which he might have derived from the execution of the work in full but
he did not so derive in consequence of the full amount of the work not having being carried out, or on
account of any loss that he may be put on account of materials purchased or agreed to be purchased or
for unemployment of labour recruited by him. He shall not also have any claim for compensation but
reason of any alterations having been made in the original specifications, drawings, designs & instructions
that may involve any curtailment of the work as originally contemplated. Where however, materials have
already been purchased or agreed to be purchased by the contractor, before receipt of the aforesaid
notice, the contractor shall be paid for such materials at the rate determined by the GSECL, provided they
would have been useful for the work curtailed or stopped are not in excess of requirements are of
approved quality & cannot be used on other contract works or otherwise by the contractor &/or shall be
compensated for the loss if any, that he may put to, on respect of materials agreed to be purchased by
him, the amount of such compensation to be determined by the GSECL, whose decision shall be final.
The GSECL may order the contractor to suspend any work on account of bad weather; rain or storm &
such other adverse climate conditions & the contractor shall comply with the same. The contractor shall
not be entitled to any compensation for such suspensions of work.
25.0 OTHER CONTRACTORS
Apart from this work, the other works connected with this work will be simultaneously going on either
departmentally or through any other contractors. The contractors shall co-operate with others to their
fullest extent & shall allow each other every facility & coordination for the execution of their works
simultaneously & satisfactorily, during their action of machinery or execution of any other coordination
works, the contractor will have to co-operate as directed by the GSECL’s Engineers in the charge of the
works. In such cases the contractor shall not be entitled for any compensation on account of reduction or
stoppage of labour force/machinery/equipment etc.
In the matter of dumps, haul, roads, drainage, diversion & the like, each contractor shall take into
considerations the needs & the requirements of the other contractors if any working in the vicinity.
Further no contractor shall take or cause to be taken any stops or action that may cause disruption,
discontent or disturbance to the work, labour arrangements etc. to other contractors. Any action, by any
contractor, which the GSECL in the unquestioned discretion may consider as infringement of the above
code, would be considered as a breach of the contract conditions & the GSECL may take such action as
may deem fit against the contractor & the action taken shall be considered as final & binding.
26.0 SPEED OF WORK
The contractor shall at all times maintain the speed of work to confirm to the latest operative progress
schedule but the GSECL may at any time with sufficient notice in writing direct the contractor to slow
down or to accelerate any part or the whole work for any reason (which shall not be questioned
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whatsoever) & the contractor shall comply with such orders of the GSECL. The compliance of such orders
shall not entitle the contractor to any claim or compensation.
27.0 CONTRACT DOCUMENT & MATTERS TO BE TREATED AS CONFIDENTIAL
All documents, correspondence, decision & other matters concerning the contract shall be considered as
of confident & restricted nature by the contractor & he shall not divulge or allow access there to any
unauthorized persons of any kind.
28.0 ACCESS TO THE CONTRACTOR’S BOOK
Whenever it is considered necessary by the GSECL to ascertain the actual cost for execution of any
particular item of work, the GSECL may do so by directing the contractor to produce the original invoices.
29.0 INTEREST ON MONEY DUE TO THE CONTRACTOR
The contractor shall not be entitled to receive the interest on the payment due to him upon
measurements or otherwise or on any balance payable to the contractor. Also, contractor shall not be
allowed to relate it with the progress of work at site in any case.
30.0 MEASUREMENTS TO BE PROVISIONAL & SUBJECT TO CORRECTION
Every measurement for running payment on account of work done be subject to adjustment or final
measurements. In case there is disagreement between such intermediate & final measurements, the
latter shall prevail.
31.0 R/A BILLS
One measured R.A. Bill shall be made every month on submission of bill by the contractor in GSECL's
prescribed format. No Ad-hoc payment will be made.
32.0 BREACH ON PART OF GSECL NOT TO ANNUL CONTRACT
No breach or non-observance on the part of the GSECL of any the agreements contained herein, shall
annul this contract of discharge the contractor from the observance & performance thereof, or of any
part thereof, but on application by the contractor & in the unfettered discretion of the GSECL an
extension of time may be given to the contractor in respect of such breach or non-observance by the
GSECL.
33.0 LABOUR CONDITIONS
33.1 The contactor shall comply with the labour laws laid as may be current & shall furnish the
returns & information as may be specified from time to time.
33.2 The contractor shall as far as possible obtain his requirements of labour, skilled & unskilled from
the local areas.
33.3 The contractor shall pay wages as per the latest circulars applicable at the times for the
minimum wages to be paid to unskilled, semiskilled & skilled labour prescribed by the Government of
Gujarat.
33.4 The GSECL shall have the authority to remove from the work site any person, who may be
considered unfit or undesirable & no responsibility shall be accepted by the GSECL for any delay or extra
expense caused towards the completion of the work by such removal.
33.5 If Government declares a state of scarcity or famine to exist in any village situated within 10 Km.
of the work site then the piece worker or contractor shall employ upon such parts of work, as are suitable
for unskilled labour any person certified by the GSECL or by any person to whom the GSECL has
authorized, & shall pay the minimum wages as fixed by the Government of Gujarat in this behalf. Any
dispute that may arise in the implementation of the clause the decision of the EIC shall be final & binding.
33.6 The contractor shall provide reasonable facilities to the labour employed by him. The usual
facilities are weather proof shelter for rest & meal, supply of whole some drinking water, facilities for
obtaining food, reasonable washing & sanitary facilities, special facilities for women workers, suitable
residential accommodation, general sanitation & health measures etc.
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33.7 The implementation of any & all provisions of this clause in no way entitles the contractor to
claim in this contract.
34.0 LOCAL LAWS
34.1 All local laws in force at the time entering into the contract & those enacted there after shall be
binding on the contractor & he shall abide by the same.
34.2 All import duties, sales tax & other local taxes shall be borne by the contractor & they shall be
deemed to have covered by this quoted rate.
35.0 PERFORMA RETURNS
The contractor shall maintain Performa, charts & details regarding machinery, equipment, materials
labour, personnel & other matters as may be specified by the GSECL time to time.
36.0 WORK IN SHIFT DUTY
36.1 Works shall be planned in shifts, if possible in three shifts, depending upon the emergency of
the work with prior approval of the GSECL. On Sundays or any other holiday work shall be continued in
order to maintain progress of work with prior approval of the GSECL. Such works shall not form any
ground for complaint, compensation or extension of time limit. If on the other hand, the GSECL directs
that the work shall be proceeded with, on days & during hours otherwise non-permissible under this
contract, the contractor shall proceed with the work as directed without in any way vitiating this contract
or forming any grounds for compensation of claim.
36.2 The contractor shall in his dealing with labour, at all times, during the period of this contract,
have due regard to local festivals & religious & other customs.
36.3 A working day shall consist of three shifts of 8 hours each. A working day shall constitute any
day on which in the opinion of the GSECL, work can be carried out on one or more shifts.
36.4 The time of completion as defined in this Contract shall be deemed to exclude working during
night hours. If, however it is required to complete the work in time, the GSECL may permit to execute the
work in night hours. Night work shall not entitle the Contractor to any or such claims/extra payments due
to night works. Where night work is in progress, the Contractor at no extra cost, to safeguard the
workmen & public shall provide sufficient lights. The excavated areas in all the cases shall have to
sufficiently & satisfactorily cordoned & barricaded with red signal lights to prevent accidents of any
nature etc.
37.0 MAINTENANCE
Contractor shall be responsible for carrying out Operation and Maintenance for 5 years including that of
structural steel, Electrical equipment and fittings and Mechanical parts and fixtures.
The contractor has to carry out painting in the 5th
year again before the defect liability period expires.
Any failure in Aviation lighting, opacity meters, Ducting insulation, Elevators etc. shall be replaced without
any extra cost as and when the failure occurs.
38.0 LEINS
Final payment to the contractor shall not be made until the contractor shall deliver to the GSECL receipt
in full in lieu thereof, & in either case, an affidavit that so far he has knowledge or information the
releases & materials for which in line could be filed. If any line remains unsatisfied after all the payments
are made, the contractor shall refund to the GSECL all money that the latter may be compelled to pay in
discharging such a line, including all costs & reasonable attorney.
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39.0 PAYMENT SHALL BE RELEASED ON THE AVAILABILITY OF FUND WITH GSECL. Payment to
contractors shall be made by RTGS/NEFT Mode of payment. The contractor shall furnish the detail
like, Bank Account No., Name of Bank, Branch Name, IFSC Code No., E-Mail Address and copy of
Cancelled Cheque to enable GSECL for payment of the Bills. Generally payment may take 30 to 60
days after passing of bills depending on availability of fund..
40.0 CONTRACT
After the tender has been accepted by the GSECL, all orders or instructions to the contractor shall, except
as herein otherwise provided to be given by the GSECL’s engineers at site on behalf of the GSECL for the
speedy execution of the work.
41.0 INSURANCE
41.1 The contractor shall procure, or arrange for the Subcontractor to procure insurance coverage in
amounts approved by the GSECL & sufficient to protect against the following risks arising out of the
work.
1) Accidents & professional & non-professional sickness of all labourers & personnel engaged in
the work as required by Law pursuant to Workmen’s Compensation Act, 423 or Revised version
thereof.
2) Injury or death to third parties including without limitation injury or death caused by any of the
construction aids or vehicles or rented machinery, equipment used by the contractor or
subcontractor whether at the site or elsewhere.
3) Damage to contractors tools machinery, construction equipment form works, scaffolding
materials etc. due to floods, earthquake or any such cause.
4) Damage to the existing permanent structures of the GSECL & nearby villages, equipment of the
GSECL or of the co-contractors working in the area for other works.
41.2 All the above conditions referred for the insurance cover, shall be in effect from the date of
commencement of the work until the GSECL has accepted the work.
41.3 In the policies covering the insurances referred to above, the GSECL, contractor & the
subcontractor shall be as co-ensured where possible.
41.4 The cost of insurance shall be borne by the contractor.
42.0 LABOUR COLONY/STAFF QUARTERS
The contractor shall arrange the quarters for his staff and labour colony at their own cost as per
the labour laws. GSECL will not allocate area for the same.
43.0 EMPLOYEES PROVIDENT FUND
Bidders shall note that they possess P.F. Code No. in the name of the company [under
Employees Provident Fund Organization, Regional Office, Ahmedabad directive] obtained from
the concerned Authorities of their respective jurisdictions.
In the event of non–possession of the separate P.F. Code No. as detailed in the foregoing para,
the offer shall summarily not be considered for the acceptance despite the offer is the lowest
quoted offer in the price bid opening.
Signature of Contractor General Conditions of Contract Page 76 of 169
GUJARAT STATE ELECTRICITY CORPORATION LTD.
KACHCHH LIGNITE THERMAL POWER STATION,PANANDHRO, PO: SKVNAGAR, TA.
LAKHPAT, DIST. KACHCHH
TECHNICAL SPECIFICATIONS
Design, Engineering and Turnkey Execution for Construction of 190 M High RCC
Chimney, Flue Duct Foundation and related work to suit 190 M Chimney at KLTPS,
Panandhro, Gujarat
Signature of Contractor General Conditions of Contract Page 77 of 169
TABLE OF CONTENTS (TECHNICAL SPECIFICATIONS)
TECHINICAL SPECIFICATIONS ..................................................................................................................... 78
1.0 INTRODUCTION .......................................................................................................................... 78
2.0 GENERAL DETAILS OF WORK ...................................................................................................... 78
3.0 SCOPE ......................................................................................................................................... 78
4.0 COPIES DESIGN AND DRAWINGS ............................................................................................... 80
5.0 GENERAL PARAMETERS ............................................................................................................. 80
6.0 DESIGN CRITERIA ........................................................................................................................ 82
7.0 CODES, STANDARDS AND PUBLICATIONS .................................................................................. 82
8.0 LOADING .................................................................................................................................... 83
9.0 LOAD COMBINATIONS ............................................................................................................... 84
10.0 ANALYSIS .................................................................................................................................... 84
11.0 PERMISSIBLE STRESS .................................................................................................................. 85
12.0 COMPONENT DESIGN CRITERIA ................................................................................................. 85
13.0 ACCESSORIES .............................................................................................................................. 89
14.0 PAINTING.................................................................................................................................... 92
15.0 FLUE OPENING ........................................................................................................................... 93
16.0 LIGHTNING PROTECTION SYSTEM ............................................................................................. 93
17.0 AVIATION OBSTRUCTION/WARNING LIGHTING SYSTEM .......................................................... 95
18.0 EARTHING SYSTEM ..................................................................................................................... 96
Signature of Contractor General Conditions of Contract Page 78 of 169
TECHINICAL SPECIFICATIONS
1.0 INTRODUCTION
KLTPS (Kutch Lignite Thermal Power Station) is pit head lignite based Thermal Power Station in
Kutch District of Gujarat, India. Two units, Unit No. 1 & 2 of 70 MW each and Unit No. 3 & 4 of 75
MW are in operation at KLTPS.
2.0 GENERAL DETAILS OF WORK
2.1 Design, Engineering & Turnkey execution for Construction of 190 M High RCC Chimney at KLTPS,
Panandhro, Kutch.
2.2 Design, Engineering & Construction of New Flue Duct & flue duct foundations from terminal
point to flue duct entry of the proposed 190 M Chimney to be erected at KLTPS, Panandhro,
Kutch.
2.3 Demolition and reconstruction of allied Structures like existing flue duct from Unit No. 4 to
existing chimney (demolition shall be carried out after joining the flue duct with new
constructed chimney) & other structures if any surrounding the proposed location of 190 M
Chimney to be erected at KLTPS, Panandhro, Kutch.
3.0 SCOPE
It is not the intent to specify completely herein all details of design and construction of the works
covered under this specification. All works shall be done as per specification and approved for
construction drawings and in a manner acceptable to Engineer-In-Charge.
The works covered in this specification shall include furnishing of all materials, labour, tools,
plants and equipment, transportation, fabrication, supervision, construction as per drawings
including embedment of bolts, inserts, leaving holes, pockets, grooves, chamfers as shown
therein and all incidental items not shown or specified but reasonably implied as necessary for
satisfactorily completion of the project as a whole.
The scope of work covered in this specification in general, comprises the design construction &
commissioning of 190m high RCC Chimney required for 75 MW power plant of KLTPS, Panandhro,
Kutch, Gujarat. The scope of work shall consist of but not be limited to the following:
3.1 Geo-Technical investigation and preparation of soil investigation report.
3.2 Preparation of design basis report, design and construction drawings
3.3 Vetting of drawings by the Consultant & Obtaining approval for above at all stages.
3.4 All excavation works in all types of soils/rocks including dewatering as necessary.
3.5 Providing and laying of grounding mat for foundation
3.6 Construction of pile/raft foundation.
3.7 CPCI & ERBP Protective painting to sub-structures in direct contact with soil
3.8 Backfilling around the foundation
3.9 RCC grade slab
3.10 RCC shell
3.11 Hopper
3.12 RCC corbels at intervals
3.13 Chimney cap
3.14 Companion flange and brackets including inserts on the shell for the flue duct connection.
Signature of Contractor General Conditions of Contract Page 79 of 169
3.15 Access, maintenance and clean out doors
3.16 External Cage Ladder (full height of the chimney) and hand railings
3.17 Insulation material
3.18 Platforms, inserts & miscellaneous bolts and anchors required for instrumentation of chimney
3.19 Lightning protection and grounding systems
3.20 All painting work including for aviation, day warning painting as per aviation requirements
3.21 Aviation night warning lights, lighting system inclusive of all accessories and cabling work from
power supply point
3.22 Mandatory spare parts
3.23 One (1) set of special tools and tackles
3.24 All relevant drawings, data and instruction manuals.
3.25 Installation of lights at all external platforms.
3.26 Providing and installation of rack and pinion elevator of 400 kg capacity including necessary
grooves, holes etc. in the structure required for erection of the elevator
3.27 Wind Tunnel Study: Some other tall structures are located in close vicinity of the Chimney. The
aerodynamic interference effect due to these shall be studied and incorporated in the design of
the Chimney. Wind tunnel model study for determining the aerodynamic interference is
included in the bidder’s scope. The study shall be done by a specialist agency in this field and
acceptable to owner.
3.28 Attending meetings at Owner/Consultants office at Vadodara, Panandhro or Mumbai or any
other place as fixed by Engineer-In-Charge as and when required for review, discussions, co-
ordination etc.
3.29 All other works not specifically mentioned above but indicated in the drawings, which are
necessary for the satisfactory completion of the work as a whole.
3.30 Approvals from client
The contractor, unless specified otherwise, shall take the approvals from owner which include
but shall not be limited to the following:
1) Design, prepare and getting approval of working drawings for slip formwork, scaffoldings,
supports, staging, Hoist for concrete from the Engineer-In-Charge.
2) Prepare and submit for, approval, as per approved schedule, detailed drawings for R.C. work in
shell, hopper, footing, platforms and bar bending schedules for reinforcement bars showing the
positions and details for reinforcement bars, showing the positions and details of spacers, chairs,
supports, hangers, openings etc.
3) Prepare detailed fabrication and erection marking drawings for steel and metal works and
submit them for approval.
4) Prepare detailed shop drawings for various inserts, anchors, sleeves, frames, templates, anchor
bolts etc. showing relative locations of their installations and submit them for approval.
5) Prepare and submit for approval the detailed schemes for operations like material handling,
placement of concrete etc. and for items like approaches, services etc.
6) Design and submit for approval the mix proportion for concrete to be adopted on job.
7) Furnish samples and submit for approval the results of tests for various properties of the
following materials
a) Ingredients of concrete i.e. Cement, Coarse aggregate, Fine aggregate, reinforcement bars etc.
b) Concrete
c) Metal work components
Signature of Contractor General Conditions of Contract Page 80 of 169
d) Fire bricks
e) Castable refractories
f) Insulation material
g) Paints
8) Provide all incidental items not specified or shown on drawings in particular but reasonably implied or
necessary for Successful completions of the work in accordance with drawings and specifications.
9) Produce, if directed by the Engineer-In-Charge, a guarantee, in approved proforma, for satisfactory
performance, for a specified period, of material manufactured by specialist forms.
Before starting construction, the Contractor shall have to take approval for relevant drawings and data
from Owner in writing. Any construction done prior to the approval of drawings/data shall be rectified
in accordance with the approved drawings/data by the Contractor at his own cost and the construction
to be made shall be executed within the stipulated period.
In case of any conflict regarding the interpretation of meaning of specifications or drawings, Owner
shall interpret such meaning, which will be final and binding on the Contractor and the same shall be
brought to the notice of the Engineer-In-Charge.
The Contractor shall supply all brand new equipment and accessories as specified with such
modification. Contractor shall rectify and make good all defective work during the defects liability
period.
4.0 COPIES DESIGN AND DRAWINGS
4.1 DESIGN DOCUMENTS: 4(FOUR) copies + SOFT COPY for approval
4.2 DESIGN DRAWINGS: 6(SIX) copies + SOFT COPY for approval
4.3 AFTER APPROVAL: 11(ELEVEN) copies + SOFT COPY of each drawing to be submitted for
distribution after duly marking it approved/released for construction as directed by GSECL.
4.4 Preparation and submission of as built drawings: 4(FOUR) copies + SOFT COPY + 2(TWO)
reproducible tracing prints (RTF).
It is not the intent to specify completely herein all details of design and construction of the works
covered under this specification. All works shall be done as per specification and approved for
construction drawings and in a manner acceptable to Engineer-In-Charge.
The works covered in this specification shall include furnishing of all materials, labour, tools,
plants and equipment, transportation, fabrication, supervision, construction as per drawings
including embedment of bolts, inserts, leaving holes, pockets, grooves, chamfers as shown
therein and all incidental items not shown or specified but reasonably implied as necessary for
satisfactorily completion of the project as a whole.
5.0 GENERAL PARAMETERS
5.1 DESIGN PARAMETERS
Name of Work
Design, Engineering and Turnkey Execution for Construction of 190 M High RCC Chimney, Flue duct and
related work to suit 190 M Chimney at KLTPS, Panandhro, Gujarat.
Total height of stack above ground level : 190 m
Number of Stacks (Wind Shield) : 1 no.
Number of Flues : 1 no.
Signature of Contractor General Conditions of Contract Page 81 of 169
Design Exit Velocity (Flue gas) : 18 m/s
Minimum Shell Diameter at top : 3.25 m
Flue Diameter at top : 2.6 m or as per design.
Minimum Shell Thickness at top : 300 mm
Shell Diameter at bottom : As per design
Minimum shell thickness at bottom : 500 mm
Minimum shell thickness (general) : 300 mm
Volume of gas at exit of ID Fan : 104.22 cum/s
Flue gas temperature : 140 – 190 deg C
Inlet duct centreline elevation : EL +13.00 (approx..)
Inlet duct dimensions : 4m x 2m (approx..)
Graded level of ground : EL 0.0
Chimney grade slab level : EL +0.15
Minimum founding level for chimney foundation : EL-3.00
Elevation of opacity meter, SOx & NOx monitors : At first external platform
Increase in permissible stresses of concrete & steel for
wind/seismic loading
: Not allowed
Reinforcement steel : All The Reinforcement bars shall be
Corrosion resistant steel bars of
Grade Fe500 of TATA/SAIL/ZINDAL
/ESSAR make only with properties
conforming to IS: 1786, having
Corrosion resistant elements not less
than 0.5% shall be used for all the
works
Cement : Fresh OPC 43 grade/53 grade
cement confirming to IS: 8112-
1991/IS: 12269 of approved Brand
by GSECL, as per the detail
specifications/requirements.
Remarks:
1) Suitable margins may be added over and above the given Operating conditions for stack design.
2) The temperature of flue gas may vary within the range of 140degC to 190degC Stack capability shall
be checked for this temperature variation & consequent volume variation.
3) Access door (electrically operated) at grade level shall be provided for access into the windshield.
All doors like inspection/ maintenance doors shall be as per IS code / environment regulation.
4) Natural Ventilation within the windshield shall be provided as required.
5.2 GRADES OF CONCRETE AND STEEL
Signature of Contractor General Conditions of Contract Page 82 of 169
1) Minimum Grade of concrete and Minimum Cement Content of various grades for different RCC
structures of the chimney to be adopted is as under, even the design permits lower grade of
concrete or lower minimum cement content.
Elements/structures Minimum Grade of Concrete Minimum Cement contents Kg/CMT
PCC M15 240 Kg/CMT
Drains/trenches M25 340 Kg/CMT
Foundation/ Chimney Raft M35 450 Kg/CMT
Chimney shell M35 450 Kg/CMT
2) All The Reinforcement bars shall be Corrosion resistant steel bars of Grade Fe500of
TATA/SAIL/ZINDAL/ESSAR make only with properties conforming to IS: 1786, having Corrosion
resistant elements maximum 0.5% shall be used for all the works.
6.0 DESIGN CRITERIA
The design and construction of the chimney and its foundation with duct supporting structure
and pedestals shall conform to the requirements of all statutory rules and regulations of local and
national authorities. Where such requirements are less conservative than the corresponding
requirements of this specification, the latter shall govern.
The FOS against overturning under worst combination of loads shall not be less than 1.5 in any
direction during construction and 2.0 after construction is complete. For the purpose of
computing FOS against overturning during construction the weight of liner, platforms, insulation
and accessories shall not be considered. Increase in net safe bearing capacity under wind and
seismic loading shall not be allowed. No tension is allowed in gross pressure under chimney
footing in working load condition.
7.0 CODES, STANDARDS AND PUBLICATIONS
7.1 CODES AND STANDARDS (All codes mentioned throughout this specification shall be the latest
revisions unless mentioned otherwise)
1) IS: 456-2000 - Code of Practice for plain and reinforced concrete.
2) IS: 800-1984 - Code of Practice for general construction in steel.
3) IS: 808 -1989 - Dimensions for Hot rolled steel beam, column, channel and angle sections.
4) IS: 875 (Part 3) -1987 - Code of practice for design loads (other than earthquake) for buildings and
structures – Part 3 – Wind Load.
5) IS: 1893 (Part 1) -1984–Criteria for earthquake resistant design for structures.
6) IS: 2062 -1999 - Specification for weldable structural steel.
7) IS: 2629 -1985 - Recommend practice for hot-dip galvanizing of iron and steel.
8) IS: 3144 -1992 - Methods of test for mineral wool thermal insulation materials.
9) IS: 3346 -1980 - Method for the determination of thermal conductivity of thermal insulation
materials (two slab, guarded hot – plate method).
10) IS: 3677 -1985 - Unbonded rock and slag wool for thermal insulation.
11) IS: 4998 -1975 - Criteria for design of reinforced concrete. Chimneys, (Part-1) – Design criteria.
12) IS: 4998 – 1992 - Criteria for design of reinforced concrete. Chimneys, (Part-1) – Assessment of
loads.
13) IS: 8183 -1993 - Specification for bonded Mineral wool.
14) ASCE-1975 - Design and construction of steel chimney liners. Task committee on steel chimney
liners, Fossil Power Committee, Power Division, ASCE.
Signature of Contractor General Conditions of Contract Page 83 of 169
15) ACI: 307-1979 - Design and Construction of Reinforced Concrete Chimneys. (If some items are not
covered in Indian Codes).
7.2 PUBLICATIONS
1) Manohar S.N., “Tall Chimneys – Design and Construction”. Tata McGraw Hill Publishing Co. Ltd.,
New Delhi, 1985.
2) Pinfold G.M., “Reinforced Concrete Chimneys and Towers”. View Point Publication, Cement and
Concrete Association. U.K.1975.
3) Vickery B. J., “Wind Induced Loads on Reinforced Concrete Chimneys”, Paper presented at National
Seminar on Tall Reinforced Concrete Chimneys, 25-27 April, 1985.
8.0 LOADING
8.1 DEAD LOAD
All permanent loads due to the weight of chimney shell, internal platforms and linings supported on
them, ladders, flue ducts, staircases, other accessories etc.
8.2 IMPOSED LOADS
1) Imposed load on service platform around Chimney shell, shall be taken as 5 kN/m2. Design live load
during construction / erection shall be considered as 10kN/m2.
2) Imposed loads from duct joining the Chimney shall be considered.
8.3 WIND LOAD
The wind loading shall conform to IS: 875 (Part-3). Following parameters shall be considered for
assessing wind loads:
1) Basic wind speed = 50 m/s at 10m above mean retarding surface
2) The mean probable design life of the structure may be taken as follows for arriving at the
probability factor k 1
a) 25 years for shell alone condition;
b) 100 years for completed chimney condition.
3) k3 = 1.0
4) k2 = As per Table 2 of IS: 875 corresponding to terrain category 2
5) k2 (bar) = As per Table 33 of IS: 875 corresponding to terrain category 2
Aerodynamic Interference Effect (proximity effect) due to presence of other tall structures and stacks in
the vicinity shall be assessed based on the result of wind tunnel test to be done by the Bidder and shall
be incorporated in design. Proximity effect shall also be evaluated as per method given in ACI 307.
Worst of the effects shall be incorporated in the design.
8.4 SEISMIC / EARTHQUAKE LOAD
Earthquake forces acting on the Chimney and analysis for the same shall be carried out as per IS: 1893
(Part 4) using the Response Spectrum Method. Material damping factor and number of modes to be
considered for the analysis shall be as per recommendation in the codes. An importance factor of 1.75
should be considered in seismic design.
8.5 THERMAL EFFECT
Thermal effect due to established thermal gradient shall be duly considered as per provisions in relevant
IS code. The temperature gradient T across the shell thickness of wind shield shall be calculated as per
IS: 4998 but subject to a minimum of 30O C. The temperature stresses shall be calculated according to
the procedures given in ACI – 307 and IS: 4998.
Analysis shall be carried out for ambient temperature variation. The temperature variation shall be
considered as 2/3 of average maximum annual variation in temperature. The average maximum annual
Signature of Contractor General Conditions of Contract Page 84 of 169
variation in temperature for this purpose shall be taken as the difference between the mean of the daily
minimum temperature during the coldest month of the year and mean of daily maximum temperature
during the hottest month of the year.
8.6 LOCAL LOADS
The effect of following local loads shall be considered.
1) Local moment produced by corbels.
2) Local moment due to platforms.
3) Local moment due to occurrence of ovalling oscillation.
4) Local moment produced by thermal gradient.
8.7 SECONDARY LOADS
1) Secondary loads due to chimney deflection.
2) Secondary loads due to foundation rotation.
9.0 LOAD COMBINATIONS
Various load combination for calculation of stresses shall be as under.
9.1 Dead load
9.2 Dead load + Wind load.
9.3 Dead load + Earthquake effect.
9.4 Dead load + Temperature effect.
9.5 Dead load + Wind load + Temperature effect.
9.6 Dead load + Earthquake force + Temperature effect.
In Load combinations (8.1) to (8.6) above, dead load considered shall be with or without the weight of
flue and whichever condition is more critical shall adopted for design. Across wind loads shall be
combined with co-exiting along wind loads. The combined design moment at any section shall be taken
as SRSS of the moments due to a cross-wind loads and co-exiting along winds loads.
10.0 ANALYSIS
10.1 FREE VIBRATION CHARACTERISTICS OF WIND SHIELD
Assessment of Natural Frequencies and mode shapes shall be carried out. For this purpose the Chimney
shell shall be idealized as a vertical cantilever with Lumped masses at different nodes. The nodes shall
also be provided at each platform level.
The number of modes to be considered in the analysis shall such that at least 90% of the modal mass is
excited.
10.2 WIND LOADS
1) ALONG WIND LOAD
Along wind load shall be assessed based on methods specified in IS: 4998 (Part-I) – 1992. For design,
higher of the wind loads obtained from simplified method in A-4.1 and random response method in A-
5.1 shall be used.
The “gust factor” shall be calculated according to the method given in IS-4998 (Part –1) – 1992. Dynamic
modulus of Elasticity of concrete as recommended in IS: 4998 (Part-1) 1992 shall be used for calculating
the natural frequencies of the chimney.
Drag coefficient CD or Force coefficient Cf shall be taken as 0.8 (minimum) based on Fig 5 of IS: 875 for
the concrete shell in general. It shall be increased as required as per IS: 4998 over the portion covered
with strakes, if required.
Signature of Contractor General Conditions of Contract Page 85 of 169
2) ACROSS WIND LOADS
The across wind response of the Chimney shall be evaluated as per the method given in Section A-4 as
well as A-5 of IS: 4998 (Part-I) – 1992. Higher of the two moments shall be considered for design of the
Chimney.
Across wind response of the stack shall also be evaluated as per method given in ACI 307. Higher of the
moments shall be considered for design of the chimney.
This shall be checked as under:
a) The critical wind velocity Vcc for across wind response shall be evaluated based on IS: 4998
(Part-1) 1992.
b) Knowing the height (Zc) at which Vcc acts, corresponding value of K2 is read from table 33 of IS:
875 (Part-3) for the particular terrain category.
c) Response shall be evaluated for the above wind speed for along wind condition.
d) Response evaluated for across wind condition shall be vectorially combined with the response
obtained as above.
Galvanized mild steel strakes shall be provided, irrespective of wind tunnel test results. Please note
that even though strakes are provided, across wind analysis (and its combination with other loads)
shall still be performed assuming no wind strakes and the chimney designed accordingly.
3) RING MOMENTS DUE TO WIND
The circumferential ring moment due to wind shall be calculated in accordance with clause 5.4 of
IS: 4998 (Part-1) –1992. The wind induced stresses in concrete and steel shall be calculated in
accordance with cl no D-2.2.7, D-2.2.8 and D-2.2.9 of IS 4998 (part 1) –1975.
4) WIND TUNNEL TEST
Effect of adjoining tall structures such as boilers, cooling towers, future chimney etc. on magnifying
wind loading on the Chimney shall be studied in a wind tunnel before the designs are finalized. If
needed, modifications shall be made in the design of wind shield and foundation. Wind tunnel
studies are included in the scope of the bidder and shall be carried out by any reputed institute.
A provision of 10% increase in the wind forces (due to dynamic interference effect) as calculated
based on relevant codes shall be considered in the initial design. However, for final design, the
increase can be as per the recommendations of the agency carrying out wind tunnel studies.
10.3 SEISMIC ANALYSIS
The Seismic Analysis shall be carried out using the Response Spectrum Method according to IS: 1893
taking the first 5 modes (minimum) of vibration in to account. 5% damping shall be considered for the
analysis. Zone and importance factors shall be takes as following,
1) Zone: V
2) Importance: 1.75 (IS 1893 part 5)
3) Response reduction R: 3
11.0 PERMISSIBLE STRESS
The Stress in Steel reinforcement and Concrete shall not exceed the limits as prescribed in clause 7.0 of
IS: 4998 (Part-1) – 1975 for various combination of loads. Except for case of dead load + wind load, the
maximum permissible stress in concrete in this case shall not exceed 0.32 Fck, where Fck =
Characteristic compressive strength of concrete.
12.0 COMPONENT DESIGN CRITERIA
12.1 WIND SHIELD
Signature of Contractor General Conditions of Contract Page 86 of 169
The design conditions for the concrete shell shall be as follows:
1) The concrete shell shall be designed for loads and load combinations as specified. Working stress
method shall be used for design of shell. The modular ratio shall be calculated as per Annexure – B
of IS – 456.
2) The permissible stress in concrete and reinforcement shall be limited to as specified in clause 8 of
IS 4998 (Part 2).
3) The maximum deflection at the top of the chimney for both static and dynamic cases shall not be
more than H/500 where H is the total height of the windshield above top of the foundation.
4) The static modulus of elasticity of concrete for various concrete grades shall be taken as specified
in IS: 456.
5) The dynamic modulus of elasticity of concrete for various concrete grades shall be taken as lower
values in the range of values specified in IS: 4998 (Part-I) – 1992.
6) Minimum thickness of shell shall be as defined in clause 5.1 General Parameters.
7) The permissible stress in concrete and reinforcement shall be limited to as specified in clause 5.0 of
IS 4998 (Part 2). The stress in concrete at the junction of shell and foundation shall be limited to
0.32Fc where Fc is the characteristic compressive strength of the weaker concrete between shell
and foundation.
8) The thickness of RCC shell shall be provided as required by stress calculations. However, the
thickness of the shell has also to be determined on the basis of wind tunnel model studies and any
increase, in the thickness of shell or quantities required to be made as per report shall be followed
without any extra cost.
9) Reinforcement in the shell shall be provided as per IS: 4998 (Part-11) – 1975, except as noted in this
specification.
10) A minimum reinforcement of 0.35 % vertical and 0.30 % of circumferential shall be provided.
Minimum diameter of reinforcement shall not be less than 12mm for vertical reinforcement and
10mm for circumferential reinforcement. Maximum spacing of reinforcement in shell shall be
restricted to 250mm.
11) While providing vertical reinforcement steel in the shell, the total number of vertical bars shall be
continued till such height when alternative bars can be discontinued. However, reduction of bar
diameter along the height is permissible. At any section of the shell vertical bars shall be uniformly
spaced. Non-uniform spacing of vertical bars is not acceptable.
12) Max. One third of the vertical bars can only be lapped at one section and lapping of bars shall be
staggered. From a height from the top equal to half the shell outer diameter or 3 meters whichever
is more, the quantity of circumferential reinforcement shall be twice that arrived at from design
consideration.
13) Openings in the shell shall be provided for ductworks, access doors, ash channel and ventilation
system etc. The maximum width of opening shall be limited to an angle of not more than 30
degrees subtended at the centre of the concrete shell.
14) The total plan area of the openings at a particular section shall not be more than 15% of the plan
area of concrete shell at that location. The opening size for the purpose of stress calculations shall
be taken as 1.1 times the actual width of the opening. The extra reinforcement around opening
shall satisfy the requirements given in the following documents and the highest shall be provided.
a) IS: 4998
b) ACI 307
c) Reinforced concrete chimney and tower by G.M. Pinfold.
Signature of Contractor General Conditions of Contract Page 87 of 169
In general, the nominal concrete cover over reinforcement including links in the shell shall not be less
than 50 mm.
Expansion anchors shall be used to attach conduit, lightning and protection equipment’s, lighting
fixtures and other lightweight appurtenances.
12.2 FOUNDATION
For the purpose of preliminary design of Foundation, allowable net bearing capacity of 66 t/sq. m at a
depth of 4 m below Existing Ground Level may be considered.
The bearing capacity and soil strata furnished with the Tender are preliminary, based on the findings of
geotechnical investigation conducted at the Site and is only for reference. Actual design shall be based
on SBC obtained from final report of detailed geotechnical investigation prior to designing of the
foundation. However, Bidder shall conduct Geotechnical investigation at actual Location of the Chimney
before the start of design of the Chimney and the founding level shall be governed by more
conservative and stringent values of the two (arrived by Bidder and the Owner) bearing capacity, which
should be taken for design without any additional final cost implication to the Owner.
The following effects shall be considered for foundation design:
1) For the foundation and portion of the shell below grade level, appropriate earth pressures,
hydro- static forces, surcharge etc., as applicable.
2) Local moments due to ovaling.
3) Forces from the lift and operating equipment.
4) Construction loads such as those due to plant and equipment, stacked materials, live loads due
to movement of plant, materials and personnel, etc.
5) Dead load, live load and wind load as applicable.
A circular/annular raft foundation shall be provided. The raft shall be designed as rigid member with
uniform thickness and no tapering of thickness shall be allowed. Minimum thickness of raft shall neither
be less 0.09 times the diameter of raft or 0.3 times the overhang of the foundation beyond shell
whichever is greater. Minimum reinforcement shall not be less than 0.12 % in either face and in each
direction. Maximum spacing of reinforcement shall not exceed 300 mm. Wind and earthquake shall be
treated as normal load and no enhancement of stress is permitted on this account in soil, concrete and
steel. No tension shall be allowed under the raft during earthquake and wind. Working stress method
shall be adopted for design of foundation. Foundation shall be designed for SRSS of moments of along
wind response and across wind response.
One intermediate layer of reinforcement in raft shall be provided where the thickness exceeds 2000
mm. Two such intermediate layers of reinforcement shall be provided where the thickness exceeds
4000 mm. Such reinforcement in each direction shall not be less than 0.06% of cross-sectional area of
raft.
In foundations, the clear concrete cover shall be 75 mm.
Dowels, wherever provided, shall extend on either side of the construction joint by a length equal to the
full development length of the bars in tension.
12.3 DESIGN OF TRANSITION DUCTING
The duct work and its supporting structures shall be designed for the most onerous of the possible
combinations of gravity loading (accounting for ash accumulation), seismic loading, flue gas pressure
loading and thermal loading.
The number, size and location of flue opening in the shell shall be as shown on the bid drawings. The
CONTRACTOR shall make arrangement for the proper support of ducting on the shell, provision of
restraint / support arrangement as indicated in the bid drawings.
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The duct work profile and the guide vanes shall be so configured and sized to achieve the desired flue
gas flow characteristic and to minimize flue gas pressure losses.
The plate thickness of the ducts shall be arrived at from minimum (i.e.,codal) requirements, structural
considerations and corrosion allowances. The minimum installed thickness of the mild steel ducts shall
not be less than 10 mm in any case. Material of construction shall be mild steel conforming to IS: 2062.
The duct work shall be insulated as per the requirements and protected with aluminium foil of
minimum 1 mm thickness. Access doors shall be provided for the ducting where required for inspection
and cleaning.
12.4 HOPPER AND SUPPORTING STRUCTURE
Ash hopper shall be provided with necessary disposal arrangement at grade level of the chimney. Ash
hopper to be designed as per IS: 4995. Weight of ash to be considered shall be 1.6 T/Cu. m. for strength
design.
This shall be of reinforced concrete and lined with acid resistant brickwork laid in acid resistant mortar.
Only shaped acid resistant bricks shall be used in the hopper portion. The bricks, mortar and details of
laying and joining shall conform to the requirements laid down for acid resistant brick lining.
Between the reinforced concrete hopper and acid resistant brick lining, 75 mm thick insulation bricks of
Grade C conforming to IS:2042 or equivalent cellular concrete shall be provided. At the bottom of the
hopper, CI flanged pipe with puddle flange of required diameter and length shall be provided. Inside
surface of this pipe sleeve shall be coated with sodium silicate.
The CONTRACTOR shall be responsible for furnishing, fabricating, shop painting and delivery of ducting
which shall run from the chimney liner to the flange of the boiler vendor’s duct including all necessary
auxiliary ducting as well as soot collecting hoppers located outside the chimney shell. Soot hoppers shall
be lined with SS grade 316L. Suitable flange connection shall be provided at the exit of the hopper to
provide SS / CI pipe connection to drain ash / condensed acid mixed water.
12.5 LINING
1) GENERAL
The chimney shall be lined with standard size acid-resistant bricks for the full height of the chimney as
shown in the drawing. The lining shall be supported on reinforced concrete corbels, spaced not more
than 10m along the chimney height.
The maximum design stress on the brick line shall not exceed 21 kg per sq. cm
The value of coefficient of thermal conductivity for fireclay bricks and acid resistant bricks shall not
exceed K = 1.0 Kcal/m/hr/deg C for the hot surface temperature of the bricks at 240 deg. C.
The contractor shall furnish test certificates conforming to the specified coefficient of thermal
conductivity of both fire clay and acid resistant bricks from an approved laboratory for Engineer-In-
Charge's approval, before bringing to the site. Similarly, test certificates for fireclay and acid resistant
bricks conforming to the codal requirements shall also be furnished by the contractor.
The lining shall be strapped with circumferential and vertical galvanized steel bands having minimum
dimensions of 75 x 6 mm and 50 x 6 mm respectively, both spaced at 1 m centres, on the exterior of the
brickwork throughout the full height of the lining. The circumferential bands shall be in segments to suit
and the vertical strips shall be welded to the circumferential bands. The steel bands shall be painted
with two coats of acid and heat resistant paint after Galvanizing. Where the brick lining overlaps at
corbel levels, special care shall be taken to ensure proper sealing of joints against gas leakage, by
packing the joints with 25 mm thick loose glass wool insulation and sealed with 2 nos 25 mm dia.
asbestos rope conforming to grade 3 of IS:4687. At corbel levels, brick lining shall be laid over l2 mm
thick asbestos mill board, which is placed on the corbel.
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2) CASTABLE REFRACTORY LINING
a) Castable refractory lining material at flue entry and around clean out doors etc., shall have the
following properties:
b) Grain Size: 5 mm down graded
c) Porosity: 20 % when hand applied, 16 % when gunited.
d) Thermal Conductivity: 0.8 Kcal/m/h/deg. C
e) Setting: At ambient temperature
Certificate from the manufacturer shall be submitted to the Engineer-In-Charge for approval prior to use
in the works by the contractor.
3) BRICK LINING
The contractor shall use firebricks for lining of the chimney shell and hopper . The size and shape of
firebricks shall conform to IS: 1526 and shall be of class Group - A conforming to IS: 6. The fireclay bricks
shall be laid in fire clay mortar conforming to IS: 195. Trapezoidal bricks shall be used where found
necessary by the Engineer-In-Charge.
The bricks shall be of necessary curvature and of taper so that the lining conforms to the inner radius of
the shell. No attempt shall be made to use straight bricks and then to try to match with the inner radius
of shell of chimney by providing extra mortar.
Fire bricks shall be well burnt, compact and of homogeneous texture generally white to yellowish white
in color and free from cracks and other flaws, no broken bricks shall be allowed to be used except for
closing the course. The crushing strength of the bricks shall be not less than 200Kg. /cm2 and shall be of
Group-A conforming to IS: 6-1967, Specification for Moderate Heat Duty Fireclay Refractories, Group-A.
The water absorption of the bricks shall be within ± 5 to 10 % and the density of bricks shall be 1800 to
2300 Kg/m3.
Sample of bricks shall be submitted by the contractor for approval of the Engineer-In-Charge. For testing
of bricks, sample shall be taken according to the scheme given in IS: 1528-1962 for Sampling and
Physical Testing of Refractory Material. Cost for testing and incidental expenditure shall be borne by
the contractor and rates quoted shall include the cost.
The windshield shall be insulated by Fire bricks of minimum thickness up to 50 M from bottom and AR
bricks of thickness 115 mm for the rest of the height. Acid Resistant bricks shall conform to class II of IS:
4860. Brick work shall be laid with acid resistant mortar of potassium silicate type conforming to IS:
4832 (Part-I). The bricks shall be supported from corbels projected from windshield. Opening in corbels
is to be kept for air ventilation.
13.0 ACCESSORIES
13.1 OUTER PLATFORMS
Number of outer platforms to be provided are governed as per the requirements of aviation obstruction
lights which are required to be provided at various levels and also to meet the requirements of IS: 4998
(latest edition) I.C.A.O regulations and instructions issued by the Director General of Civil Aviation.
Platforms shall be equally spaced at a spacing of 40 m (approx.). The minimum clear width of the
platforms shall be 1000 mm and the platforms shall be designed for a minimum live load of 500 kg per
sq. meter.
50 mm dia G.I. drainage spouts shall be provided in platforms for drainage of rainwater. 150 mm dia CI /
MS (galvanized) RWDC pipe shall be provided to carry rainwater from roof to discharge point at ground
level. The number of down take pipe shall be decided as per design.
13.2 RAILING
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Hand railing shall be provided all around external platforms 32 NB (Heavy) as per IS: 1239-G.I. pipes. The
spacing of railing posts shall not be more than 2000 mm centre to centre. The height of hand railing
shall not be less than 1250 mm. There shall be three handrails at about 450 mm, 850 mm & 1250 mm
above platform level.
13.3 ROLL – UP DOOR
A electrically operated door of size 4.0 m X 5.0 m shall be installed at the base of chimney shell so that a
truck could go inside the chimney for the removal of ash from ash hoppers in case of emergency. The
door shall be installed complete with guides, hood, hardware, weather baffles, combination end locks
and wind locks, mechanism and accessories as required for proper operation and weather protection.
The complete details of rolling shutter shall conform to IS: 6248 - “Metal Rolling Shutters & Rolling
Girds” and to these specifications. The door shall be installed in accordance with the details and the
manufacturer’s directions. When installed, the door shall be free from warp twist, or distortion and shall
be lubricated and adjusted to operate freely and smoothly.
13.4 PERSONNEL / ACCESS DOORS
A steel personnel door of size 1000 W x 2100 H shall be provided for access to the windshield at grade
level. The door shall be hinged and provided with positive locking device. The hinges required for
connecting the door with door frame shall be heavy duty butt hinges conforming to IS: 1341. The size
and number of hinges required for each door shall be decided as per the overall weight of the door for
smooth and trouble free operation under service conditions. The minimum size of the hinges shall be
not less than 150 mm. The bottom of the door opening shall be 150 mm above the grade level.
13.5 CLEANOUT DOOR
A pair of doors comprising 750 mm x 900 mm door in the concrete shell and 650 x 825 mm door in the
lining shall be provided near ground/hopper level with suitable access for cleaning out soot and for
access to inside of the flue. The doors shall be hinged and provided with a locking device. Suitable
castable refractory lining 230 mm thick, covering the shell, air gap and lining shall be provided around
the doors. The doors shall be painted with three coats of acid and heat resisting paint conforming to IS:
158 type 1.
13.6 LOUVERS FOR AIR OUTLET/INLET OPENINGS
Air inlet and outlet openings shall be provided in the shell at the bottom and top respectively for
ventilation of annular space between lining and concrete shell. These openings shall be closed on the
outside with a stainless steel mesh (bird screen).
13.7 ELEVATOR
A rack and pinion elevator, with a load carrying capacity of 400 kg, cabin floor size of approx. 1100 mm x
1100 mm and an operating speed of 40 m/min., shall be provided for travel from the grade level to the
top of the chimney. The lift shall be installed using anchor fasteners. The electrical requirement of the
system shall confirm the main electrical specification. The elevator shall be supplied, installed, painted,
tested, commissioned etc. complete with all mandatory spares and operation maintenance manual.
13.8 WIND STRAKES
Strakes shall be provided (irrespective of wind tunnel test results), shall be made up of galvanized mild
steel plates and rolled sections of thickness not less than 12 mm. A corrosion allowance of 2 mm in the
structural members shall be provided for, beyond the design values.
Fixing arrangement of strakes to the chimney shell shall ensure full fixity for the design load. All strakes,
embedded parts, bolts, nuts, washers, etc., shall be hot dip galvanized. The minimum coating shall be
750gm/sq.m. and conforming to requirements of IS: 2629, IS: 2633.
13.9 GRADE SLAB
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150 thick (min) RCC grade slab over 75 mm thick PCC which may be over 300mm thick compacted sand
shall be provided on finished grade level inside the chimney shell.
13.10 LINERS ACID DRAINS AND MANHOLES
Flue acid drainage system is to be provided. This shall consist of collection sumps, conveying pipes, a
dilution manhole and a connecting pipe to the main drainage. Pipes and fittings in the connection pipe
to the main drainage system shall be vitrified clayware conforming to relevant IS code. Stainless steel
pipes bends, collection sumps, fixing straps, bolts etc. conforming to the relevant IS standard supplied
and installed.
13.11 TEST PORTS
Gas sampling ports fabricated from Stainless steel conforming to IS: 2062 shall be provided. Two nozzles
in diametrically opposite positions made of 200 NB pipe and projected about 200 mm outside the steel
flue (each flue) wall shall be provided for gas sample probe connection / mounting of in-situ analyzers
(SOx / NOx, CO). These ports shall be installed near the first external platform (from ground level).
For particulate Matters emission monitoring on stack, the location of the port holes shall be at an
elevation of minimum 8D from the point of disturbance in the flue line (where D is the inside diameter
of the chimney). The point of disturbance shall be the top of the inlet duct. Further, the selected point
shall be at least 2D before stack exit. Analyzers shall be accessible from the platform of the chimney. If
the chimney inside diameter is varying (tapered), average diameter is to be considered.
The location of the sampling ports, on the stack shall be at least at a distance of 8D (D-stack diameter)
downstream along the direction of flue gas flow from ID Fan duct connection to stack. Suitable Pressure
tapping of ½” NPT (F) for Draught measurements shall be provided on duct as per standard tapping
details
Suitable Temperature Test pockets with stub of size M33 x 2 for connecting thermo-well shall also be
provided for Flue gas temperature measurements as per the standard tapping details enclosed with this
specification.
NOTE: Test ports location shall be in line with norms with GPCB and may change as per the requirement
of user department.
13.12 EXTERNAL CAGE LADDER
Hot dip galvanized steel cage ladder shall be provided from the last platform. Stringers shall be of flat 75
x 10 with a clear distance of 400 mm in-between; rungs shall be of 20 mm diameter mild steel rods
spaced at 300 mm centre. Ladder stringers shall be provided with suitable stays connected to the
platform supporting framework. The ladder and its connection shall be designed for a load of 175 kg at
any location. Similar cage ladder shall also be provided for access to the clean out door and the platform
at soot Hopper level.
13.13 CHIMNEY ROOF CAP
In case brick flue is constructed above the roof, to prevent gas entrained matter from falling into the
space between the liner and the shell and also to prevent the chimney top from chemical attack of flue
gases, a sectional grey cast-iron cap of minimum 12 mm thickness over 25 mm thick asbestos board
shall be provided. The cap shall cover the concrete shell, brick lining and air space between them. The
cap shall slope towards the inside of the chimney at approximately 30° to the horizontal. All sections of
the cap shall be anchored in place with bronze bolts and bronze rag bolts respectively.
13.14 INSULATION AND PACKING
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All packing and insulation material shall be of thickness diameter and type as per specifications. The
packing and insulating material shall be made of asbestos rope vermiculite concrete, slag or mineral
wool and asbestos millboards.
1) ASBESTOS ROPE
The diameter of the rope shall be as per drawing. The material shall be of best quality available in the
market and shall be purchased after a sample is approved by the Engineer-In-Charge. The rope shall be
plain Grade-1 conforming to IS: 4687-1968. The strand shall be long, well twisted and no torn thread
shall stick out. The rope shall be firmly packed so as to prevent gas leakage
2) SLAG OR MINERAL WOOL
The thickness of packed slag wool shall be as shown in the drawing. The packed density of the wool shall
be within the range of 175 to 200 Kg/cum., and the co-efficient thermal conductivity shall be within the
range of 0.025 to 0.035 Kilo calories/ hour meter deg C at a mean temperature of 150degC. The material
shall be well packed in position where possible. IS: 3677 for Rock and Slag wool mats for thermal
insulation may be referred for guidance. The co-efficient of thermal conductivity and packed density
shall be tested according to IS: 3677 and IS: 3346.
Between windshield and brick 100 mm (min.) thick resin bonded rock wool or mineral wool insulation
shall be provided. The insulation shall be semi-rigid, resin bonded type, in the form of slabs and shall
conform to IS: 8183. Blanket type insulation shall not be used. The density of insulation shall not be less
than 64 kg/cum for resin bonded glass wool insulation and 100 kg/cum for resin bonded rock wool.
The insulation thickness shall be determined based on the maximum ambient temperature, surface air
velocity worked out based on the draught of ventilation air in the annular space 100 mm (min.) between
the flue liner and chimney shell, insulation surface emissivity of 0.3 and the insulation cold face
maximum temperature not exceeding 60degC. The draught of air in the annular space shall be the
natural draught created by the heating of air by the flue liner and the air being vented out through the
openings in the chimney shell. The increase in the annulus air temperature due to the rising heated air
shall be taken into account while calculating the insulation thickness.
The insulation thickness shall not be less than 100 mm, in any case, and shall be provided in two layers
with the second layer of insulation covering the joints of the first layer. The insulation shall be wrapped
on the outer-most surface with galvanized wire mesh.
3) ASBESTOS MILL BOARD
Asbestos millboard shall be of thickness as indicated in drawing. It shall be of best quality of standard
make available in the market and samples shall be submitted to the Engineer-In-Charge for approval. It
shall be plain, dense arid homogeneous texture, without crack, flaw and any other manufacturing
defect. It shall be laid directly onto the concrete bed after removing, any loose material or any
aggregate.
14.0 PAINTING
14.1 INTERNAL CONCRETE SURFACE
Painting the entire inner surface for full height including corbels, platforms, hopper, ring beams, all air
tight enclosures with acid and heat resisting black impregnated bitumastic paint (not less than four
coats) to give a paint DFT not less than 150 micron. The paint shall conform to the requirement of IS:
158 and the work shall be done as per MANUFACTURER’S recommendations.
14.2 EXTERNAL CONCRETE SURFACE
Three coats of single pack acrylic polyurethane paint of DFT not less than 150 micron and conforming to
IS: 158 shall be applied over external surface of chimney above the ground level. Top 65 meters of the
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chimney surface shall be applied with two coats of paint in alternate bands of Orange or Red and White
shade, each band with a band width of 5 meters and bands at extremities being of Orange or Red shade.
This shall be done after removing all loose and foreign matter to give a smooth and uniform finish.
14.3 STRUCTURAL STEEL SURFACE
All structural steel shall be painted with 2 coats of zinc phosphate 2 pack epoxy primer, DFT 60microns
per coat, applied on dry surface cleaned by sand blasting & two coats of two pack Epoxy finish with
micaceous iron oxide pigments having DFT 75 microns for each coat.
Special steel surfaces (such as Corten Steel, Stainless Steel, Hot insulated surfaces etc.) shall not be
painted.
15.0 FLUE OPENING
The size and location of flue opening shall be as shown in the drawing. The flue inserts and anchors shall
be hot dip galvanized. Castable refractory lining shall be provided to protect the concrete shell and seal
the air gap between shell and the lining at the flue entry level.
16.0 LIGHTNING PROTECTION SYSTEM
16.1 GENERAL
The lightning protection system to be installed on the chimney by the Contractor shall be strictly as per
specification and shall satisfy the requirement of IS: 2309 and shall be to the approval of the
GEB/Engineer-in-charge in accordance with the following:
The stack shall be provided with required (min 4 nos.) number of Copper air termination rods of 20 mm
diameter and coated with 2 mm thick lead coating, 2500 mm long. Minimum projection of 1 m shall be
provided above the highest point of the chimney and flue. The air termination rods should not be
spaced more than 2.5 m from each other. The lightning conductors shall be securely anchored with at
least three (3) suitably spaced SS anchors spaced not more than 750 mm on centres at or near the top
of the stack. The air terminators shall be sufficient distance away from the flue wall so that the rods do
not come in the path of the flue gas. Lightning conductors shall be mechanically and electrically
connected by the use of pressure type fittings to the cap ring and to a continuous circumferential
earthing band.
All connections, clamps, anchors etc., of the lightning protection system shall be made of suitable
copper or alloy fittings except if noted otherwise. All electrical connections, unless otherwise specified,
shall be clamped or bolted by high-pressure contact or by phos-copper brazing of the metal to form a
connection of adequate current carrying capacity and mechanical strength. Soldered connections shall
not be permitted.
Air terminals, connections, conductors, clamps, fixtures, anchors etc., exposed within 8000mm of the
top of the chimney shall have a continuous lead covering of a sheath commercially pure lead not less
than 1.6 mm in thickness extruded and fused upon bare copper, the ends being covered by soldering or
puddling. Where lead covering is specified, connection shall be made from copper to copper and after
the joints have been made; they shall be again covered with solder or lead either by wiping or casting so
that a bare copper shall not be exposed.
16.2 AIR TERMINALS
The chimney shall be provided with pointed vertical air terminals uniformly distributed along the top
rim of the chimney. The projected length of the air terminals above the top of the chimney shall not be
less than 1000 mm. The air terminals shall be made of lead coated solid copper rods having a minimum
diameter of 20 mm. The air terminals shall be secured to the top of chimney by at least two fasteners of
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substantial construction to withstand high wind pressure acting in the area commensurate with the
height involved. All the air terminals shall be electrically connected together by means of a band of 75 x
6 mm galvanized steel flat which shall form a close loop 600 mm below tile top of the chimney. Each
segment for the cast iron cap of the chimney shall be connected to this galvanized steel flat band by
means of tightly bolted connections.
16.3 DOWN CONDUCTORS
There shall be two separate system of vertical down conductors of 50 x 6 mm flats. One system
envisaged for lightning protection shall have two numbers of down conductors starting from the top
encircling band leading to the ground. The other system, envisaged for earthling of platforms/ladders
etc. on the stack, shall also have ground conductors originating below the platform and leading to
ground. Galvanized steel 50 x 6 mm flat bands shall be provided below each platform. These bands shall
be connected to each ground conductor. No part of the down conductor system for lightning protection
shall have electrical contact with hand rails of platform, cage ladder and encircling band ring forming
the earthing system.
The connections of the galvanized steel down conductors to be the copper air terminals shall be brazed
and connection to the nearest grounding grid at the bottom shall be arc welded. Connection between
any two galvanized steel flats/bands shall be made by arc welding. The galvanized steel flat encircling
bands shall be supported at an interval of maximum 600 mm and the vertical down conductors shall be
supported at an interval of approximately 2500 mm. The fasteners shall be of same grade of material as
the conductors and have to be galvanized. The conductor shall be laid straight and sharp bends shall be
avoided as far as practicable. A suitable bolted test piece shall be provided at each down conductor at a
convenient height near the bottom of the chimney.
At all supports, the portion embedded inside the chimney shell, conductor shall not touch the
reinforcement bars and shall be duly insulated from them. Down conductor shall be provided with a
testing point around 1000mm above ground level, but inaccessible to avoid interference. Test link shall
be enclosed in 200 x 200 x 100 mm, 16G GI box as per the drawing.
The installation work of the lightning protection system shall conform to IS: 2309.
The flue, if extends beyond last platform, shall be bonded at minimum 2 points to the lightning
conductor. All lightning conductors at this level shall be 70sqmm lead coated copper conductor.
The lightning protection down conductors shall be of size 50 X 6 mm GI flat. 4 nos. of down conductors
shall be embedded in the concrete outer shell of the chimney on diagonally opposite sides. Down
conductors shall be connected to the circumferential conductor at the top of the chimney and to the
testing point at the chimney base. There shall be no intermediate splices in the down conductors. The
down conductors shall be brought outside the shell at the bottom to facilitate connection with the test
link.
Each down conductor shall be provided with a testing point at around 1000 mm above ground level.
All connections, clamps anchors, etc. of the lightning protection system shall be made of copper or
suitable alloy fittings. All electrical connection, unless otherwise specified, shall be clamped or bolted by
high pressure contact or by copper brazing of the metal to form a connection of adequate current
carrying capacity and mechanical strength.
All vertical reinforcing bars at the top and at the bottom of the chimney shell shall be electrically
connected to the nearest horizontal reinforcing rods and these rods shall in turn be connected to the
down conductors. Where vertical reinforcing bars are spliced, each spliced bar shall be electrically
connected to at least one horizontal reinforcing bar which in turn shall be electrically connected to each
of the down conductors.
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Air terminals, connections, conductors, clamps, fixtures, anchors, etc. exposed within 8000 mm of the
top of the chimney shall have a continuous covering of a sheath of commercially pure lead not less than
1.6 mm in thickness extruded and fused upon bare copper, the ends being covered by soldering or
puddling. Where lead covering is specified, connection shall be made from copper to copper and after
the joints have been made, they shall be again covered with solder or lead either by wiping or casting so
that copper shall not be exposed.
Lightning protection system grounding shall be distinct from the plant grounding system. Lightning
down conductors shall be separately ground through earth electrode rods. The conductor from earth
electrode shall be of r 50 x 6 GI flat.
During construction, temporary lightning protection should be maintained by connecting the concrete
reinforcement to two permanent electrical grounding conductors. After the top lift of the chimney shell
has been completed, temporary air terminals which may consist of reinforcing bars should be installed
at the top to serve as temporary protection until the permanent air terminals are installed.
17.0 AVIATION OBSTRUCTION/WARNING LIGHTING SYSTEM
Aviation warning lights shall conform to ICAO, FAA and/or other international standards. LED based
medium intensity Type-B and low intensity Type-B obstacle lights shall be used on alternate platforms.
Aviation warning lights shall be provided (4 nos. per platform). The mounting arrangement of the fixture
shall be such that the inspection/maintenance of the same could be easily carried out from the
platform.
CONTRACTOR shall supply and install aviation warning lights and shall be complete with all associated
accessories such as system controllers, sockets, special cables and necessary mounting
brackets/supports. The aviation warning lights shall generally meet the following requirements:
1) Type of fitting: Medium intensity type-B flashing type and Low intensity type-B fixed type
2) Control of flash: Automatic for twilight and night intensity operation (Not applicable for Low
intensity lights)
3) Flashing frequency: 20 to 60 per minute (Not applicable for Low intensity lights)
4) Rated power supply: 240V, 1 phase and 50 Hz voltage & frequency
5) Type of Enclosure: Weather-proof conforming to IP 65 classification as per IS: 2147
Each platform shall be provided with one no. single phase, 15A receptacle. Each platform shall be
provided with sufficient platform lighting. Minimum cable size for these lighting fixture and receptacle
shall be of 2C x 2.5 mm² Cu. & 2C x 4 mm² Cu respectively. Separate JB shall be provided for each fixture
for loop-in loop-out of lighting cables. 3-phase 63A power receptacles with protection IP-55 shall be
installed in platforms. CONTRACTOR shall supply, install and wire all the lighting panels, lighting fixtures,
receptacles, junction boxes and other accessories.
For aviation warning during day time the external surface of chimneys shall be painted for whole height
as per ICAO & relevant IS standards.
During construction, the temporary aviation warning lighting shall be provided to meet the requirement
of Civil Aviation Department. The temporary warning lights installed during construction shall be lifted
up as the construction progresses. These lights need to be installed only after the height of obstruction
is more than 45 meters above grade level. Lightning protection and earthing required during the
construction stage of the chimney shall also be provided by the CONTRACTOR.
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18.0 EARTHING SYSTEM
Earthing system shall consist of main earthing conductor buried in the soil around the chimney.
CONTRACTOR shall provide 2 nos. of 50x 6 GI flats that shall run from bottom to top of the chimney.
Connection of these conductors to the main earthing system shall be by CONTRACTOR. These
conductors shall be embedded in the chimney shell on the opposite sides. The conductors shall be
brought outside the shell at the bottom to facilitate connection with the buried conductors. Risers shall
be provided at every platform. All the earthing leads from the equipments shall be electrically
connected to the nearest riser. All the exposed earthing conductors shall be of galvanized type.
Chimney cage ladder shall be electrically connected to the down conductors both at top and bottom.
Earthing of lighting panels, lighting fixtures, receptacles, junction boxes, cable trays and other steel
structures shall be in the scope of CONTRACTOR.
SCHEDULE A: DETAILS OF PERSONNEL
The list of Technical Personnel intended to be placed at the work by the Bidder (Bidders shall submit the
information in the Format detailed here as under.)
Sr.
No.
Description of
details of
position
Name Qualification Professional experience
& details of work
carried out
Remarks
Signature of Contractor General Conditions of Contract Page 97 of 169
SCHEDULE B
Sr.
No.
Item Description Quanti
ty
Unit Rate (in Fig. &
Words)
Amount (in Fig.
& Words)
01 Lump sum price for analysis, designing,
supplying, constructing, erecting, testing and
commissioning of 1 no.190 mtr. High single flue
RCC chimney including, but not limited to soil
investigation, excavation for foundation in all
types of soils and rocks with dewatering,
demolishing existing obstructing structures/
system (at location of propose chimney) and
their diverting suitably, back filling and
disposal of surplus soil to stack or fill within a
lead of not exceeding 5.o km, concreting of
foundation including removal of muck, laying of
PCC approved quality of sand filling, RCC
flooring at EL 0.00 inside the chimney, RCC
chimney shell(Shaft), raft foundation ,including
air inlet and outlet openings with Aluminium
louvers and SST bird screens, internal platforms,
staircase, intermediate external platforms,
elevator, hand railing pipes, pipe sleeves with
flanges in hoppers, providing and installing of
latest hoist slip form shuttering structures with
jacking system for construction purposes with
all accessories, safe lift system for men and
material , fire / acid resistant brick lining with
metal ties including curing, steel bands around
brick lining, portholes with their fitting,
insulation around brick lining and complete flue
ducts system from terminal point and jointing
with chimney, access maintenance and clean
out doors, MS Ladders ,G.I. Strakes, MS doors
for handling and fixing of aviation warning
lights, wind shields, at platform levels,
lightening protection system, grounding
earthling system, Complete Flue gas online
monitoring Opacity mater system, aviation
warning beacons, flood lights, lighting system
with conduits with cable boxes control panel,
main distribution board / lighting distribution
board, photocells. C.I. Chimney caps, fabrication
and fixing of flue ducts with frame, providing
Highly corrosive resistant steel reinforcement
One One
Job
work
10,30,00,000=00
Ten Crores thirty
lakhs
10,30,00,000=00
Ten Crores thirty
lakhs
Signature of Contractor General Conditions of Contract Page 98 of 169
bars , embedment /insert plates, anchors bolts,
pipe sleeve for hoist, instruments, fixtures etc.,
painting both internal and external surfaces,
CPCI & ERBP painting to sub-structures directly
in contact with soil, pulley brackets
arrangement at top of shell necessary staging,
shuttering (Formwork including slip
form).Scaffolding, bracing, cantering, including
supervision, material testing, wind tunnel test,
supply and cost of all materials, labour, all tools
and plants, equipment’s, winches for all leads
and lifts, vibrating, curing, all securities, safety,
all risks, insurances etc, obtaining of
clearances/approvals from Govt/ semi Govt
Departments/consultants as per statutory acts
for chimney, complying as per Pollution control
authorities, to restore it to original finish and
all remaining finishing works etc. complete full
flange commissioning , operation and
maintenance for Five Years period of the
chimney system performing the parameters as
per the tender design requirements, for
complete chimney arrangement as detailed in
the scope of work, as per specifications, etc.
complete as per the drawings duly approved by
the Consultant and as directed by engineer in
charge.
Total Estimate Rs. 10,30,00,000=00
TOTAL AMOUNT IN WORDS: Rs.Ten Crores thirty lakhs
Note: Lump sum quoted price shall be firm and valid without any escalation till completion of the
project.
All the bidders are requested to see and verify the documents of
(a) General safety rules / norms” to be observed by the contractors
(b) Industrial law and other related matters (Labour Laws).
(c) General terms and conditions (001-2e), General Instruction to the bidder (01-2e) under heading of
“Rules for Works”
And confirm that all the above documents you have verified & certify as below “I/we hereby has read the above
documents and agree for the Safety Rules, Industrial Laws and Contract Booklet (a, b & c as above) and accordingly
submitted my/our offer.”
NOTE: THE SCHEDULE-B IS ONLY FOR VIEWING NOT TO QUOTE THE PRICES.
CONTRACTOR MUST HAVE TO QUOTE ONLY IN ON LINE E-TENDER
Chief Engineer (G)
GSECL, KLTPS
Signature of Contractor[With stamp]
Signature of Contractor General Conditions of Contract Page 99 of 169
SCHEDULE OF PAYMENT
Description
Percentage of Lump sum
price
1) On completion of demolition, rerouting excavation,
PCC and Chimney raft foundation including CPCI &
ERBP painting
15%
2) On casting RCC Chimney Shell:
a) Up to 20 metre height
b) Up to 60 metre height
c) Up to 100 metre height
d) Up to 140 metre height
e) Up to 190 metre height
7%
7%
7%
7%
7%
3) On completion of all internal platforms and external
platforms
05%
4) On completion of Brick flues:
a) Up to 20 metre height
b) Up to 60 metre height
c) Up to 100 metre height
d) Up to 140 metre height
e) Up to 190 metre height
05%
05%
05%
05%
05%
5) On completion of Insulation of flues 02%
6) On completion of M.S. Ladder, Staircase, Doors etc 03%
7) On completion of Electrical lightning work, lightning
arresters and Aviation warning light, instrumentation
etc., complete
05%
8) On completion of Painting 02%
9) On completion of Elevator 03%
10) On completion of finishing items 05%
TOTAL 100%
Signature of Contractor General Conditions of Contract Page 100 of 169
GUJARAT STATE ELECTRICITY CORPORATION LTD.
KACHCHH LIGNITE THERMAL POWER STATION, PANANDHRO, PO: SKVNAGAR, TA.
LAKHPAT, DIST. KACHCHH
EXECUTION AND QUALITY CONTROL
Design, Engineering and Turnkey Execution for Construction of 190 M High RCC
Chimney, Flue Duct Foundation and related work to suit 190 M Chimney at KLTPS,
Panandhro, Gujarat
GUJARAT STATE ELECTRICITY
CORPORATION LTD.
Signature of Contractor Execution and Quality Control Page 101 of 169
TABLE OF CONTENTS (EXECUTION AND QUALITY CONTROL)
1.0 CONSTRUCTION ENABLING WORK .......................................................................................... 102
2.0 EXECUTION ............................................................................................................................... 104
3.0 QUALITY CONTROL ................................................................................................................... 142
4.0 TESTING .................................................................................................................................... 156
5.0 INFORMATION TO BE SUBMITTED ........................................................................................... 161
6.0 STAFF WELFARE FACILITY ............................................................... Error! Bookmark not defined.
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EXECUTION AND QUALITY CONTROL
1.0 CONSTRUCTION ENABLING WORK
1.1 GENERAL
The BIDDER shall be deemed to have visited and carefully examined the site and surroundings and to
have satisfied himself about the general site conditions, the site for disposal of surplus materials, debris
etc. and all other items affecting the work. Claims due to ignorance of site conditions will not be
considered after submission of Bid
1.2 CONSTRUCTION WATER
Construction water shall be arranged by BIDDER at his own cost. OWNER shall not provide with the
BIDDER with construction water.
1.3 CONSTRUCTION POWER
Construction power will be made available at a single point , free of cost (connection only) by Gujarat
State Electricity Corporation Ltd., metered and supplied on chargeable basis. Further distribution will
have to be carried out by the contractor as per requirements at their own cost. The necessary
consumption charges will be recovered as per the tariff rate of GSECL/PGVCL from time to time as per
GSECL’s/PVGCL’s rules.
BIDDER has to make provision of D.G sets as standby power source. The bidder along with his bid shall
indicate his average and peak power demand.
1.4 TEMPORARY SITE BUILDING
The BIDDER shall provide at his cost, the following building facilities for proper execution and quality
control of the job, while meeting the provision stipulated by Factory Rules regarding staff welfare
facilities. All these building shall have brick cladding, Steel roofing over steel roof truss with cement
concrete flooring and false ceiling with A/C as required.
1.5 SITE OFFICE
Any temporary building shall be dismantled and site shall be cleared before leaving the site after
contract is over.
1.6 STORES
A covered store shall be provided with brick cladding and G.I/colour coated sheeting to store at least
one month’s requirement of cement. Cement in bags shall be stored on a raised floor well away from
outer walls and insulated from the floor to avoid moisture. Not more than 10 bags shall be stacked in
any tier. Each consignment of cement shall be stored separately and consumed in its order of receipt.
Covered storage area may also be provided to store other construction material which will be affected
on exposure to wind, sun and rain.
Reinforcement shall be stacked on top of timber sleepers to avoid contact with ground / water.
Storage yard paved or unpaved shall be provided with in the stores complex for storage of other
material.
Proper fencing and security arrangement shall be provided for the stores complex at bidder’s risk and
cost.
1.7 TEMPORARY WORKSHOP AND GARAGE
The BIDDER shall provide for a temporary workshop and garage to attend to routine maintenance and
repair of the construction equipment’s as well as his fleet of vehicles used for construction activities.
1.8 FABRICATION YARD
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Depending on the extent of fabrication envisaged at site, the BIDDER shall establish a full-fledged
structural fabrication yard with adequate handling facility during and after the fabrication. A fully
equipped testing laboratory providing radiography, ultrasonic, dye penetration, magnetic particle test
facilities shall be ensured adjacent to the fabrication yard to enforce strict quality control. Portion of the
yard shall have covered shed with H.O.T / E.O.T cranes so that fabrication work can proceed even during
inclement weather.
1.9 SETTING OUT
The Contractor will prepare and submit to the Engineer-In-Charge, detailed drawings of the excavation
work as proposed to be executed by him showing the dimensions as per drawings and specification
adding his Proposals of slopes, shorings, approaches, dewatering sumps, berms, etc. On receiving the
approval from the Engineer-In-Charge with modifications and corrections, if necessary, the Contractor
will set out the work from the control points furnished by the Engineer-In-Charge and fix permanent
points and markers for ease of future checking. These permanent points and markers will be fixed at
intervals prescribed by the Engineer-In-Charge and checked by the Engineer-In-Charge and certified by
him, after which the Contractor will proceed with the work. Engineer-In-Charge shall be provided with
necessary men, material and instructions for such checking. It should be noted that this checking by the
Engineer-In-Charge prior to start of the work will in no way absolve the Contractor of his responsibility
of carrying out the work to true lines and levels and grades as per drawing and subsequent corrections,
if necessary, in case any errors are noticed in the Contractor's work at any stage.
1.10 INITIAL LEVELS
Initial levels of the ground either in a definite grid pattern or as directed by the Engineer-In-Charge will
be taken by the Contractor jointly with the Engineer-In-Charge over the original ground prior to starting
actual excavation work and after setting out. These initial levels will be used for preparing cross-sections
for volume measurement or for cross-checking the depths obtained from tape measurements.
All records of levels, measurements etc. and also any drawing, cross section etc. made there from, shall
be jointly signed by the authorised representative of the contractor and the Engineer-In-Charge before
the commencement of work and they shall form the basis of all payments in future.
1.11 CLEARING AND GRUBBING, ETC.
The area to be excavated or filled shall be cleared out of fences, trees, logs, stumps, bush, vegetation,
rubbish, slush, etc. and levelled up. Trees up to 300mm girth shall be uprooted. Trees above 300 mm
girth to be cut, shall be approved by the Engineer-In-Charge and then marked. Felling of trees shall
include taking out roots up to 600 mm below ground level or 150 mm below formation level whichever
is lower. After the tree is cut and roots taken out the pot-holes formed shall be filled with good earth in
250 mm layers and consolidated unless directed by the Engineer-In-Charge otherwise. The trees shall be
cut in suitable pieces as instructed by the Engineer-In-Charge.
Before earthwork is started, all the spoils and unserviceable materials and rubbish shall be burnt or
removed from the site to approved disposal areas as may be specified. Ash shall be spread or removed.
Useful materials, saleable timber, firewood, etc. shall be the property of the Owner and shall be stacked
properly at the worksite in a manner as directed by the Engineer-In-Charge.
Back-filling
Holes and depressions caused by dismantling operations shall be backfilled with excavated or other
approved materials and compacted to required density as directed by the Engineer.
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Disposal of Materials
All materials obtained by dismantling shall be the property of GSECL. Unless otherwise specified,
materials having any salvage value shall be placed in neat stacks, as directed by the Engineer with all
lifts and up to a lead of 1000 m.
Structural steel removed from old structures shall, unless otherwise specified or directed, be stored in a
neat and presentable manner on blocks in locations suitable for loading. Structures or portions thereof
which are specified in the Contract for re-erection shall be stored in separate piles.
All materials obtained from dismantling operations which, in the opinion of the Engineer, cannot be
used shall be disposed of as directed by the Engineer with all lifts and upto a lead of 1000m.
2.0 EXECUTION
2.1 GENERAL
Bidder shall ensure that the excavation and sub-structures are free from water during construction and
shall take all necessary precautions and measures to prevent ground water, storm water, etc., from
entering the excavation so as to carry out the work in reasonably dry conditions in accordance with the
construction schedule.
The Bidder shall dewater and maintain reasonably dry, the excavation for structures and all other areas
of the site, where build up of water (in the opinion of Engineer-In-Charge) is likely to obstruct the
progress of work, or lead to insanitary conditions by stagnation, or retard the speed of construction, or
is detrimental to the safety of men, materials and equipment or is undesirable due to any other reasons.
2.2 EXCAVATION
1) GENERAL
All excavations shall be done to the minimum dimensions as required for safety and working facility.
Prior approval of the Engineer-In-Charge shall be obtained by the Contractor, in each individual case, for
the method he proposes to adopt for the excavations including dimension, side slopes, shoring,
dewatering, disposal, etc. This approval, however, shall not in any way make the Engineer-In-Charge
responsible for any consequent loss or damage. The excavation must be carried out in the most
expeditious and efficient manner.
All excavation in open cuts shall be made true to line, slopes and grades shown on the drawing or
directed by the Engineer-In-Charge. No material shall project within the dimension of minimum
excavation lines marked. Boulders projecting out of the excavated surfaces shall be removed, if in the
opinion of the Engineer-In-Charge they are likely to be a hindrance to the workers.
Method of excavation shall be, in every case, subject to the approval of the Engineer-In-Charge and the
Contractor shall ensure the stability and safety of the excavation, adjacent structures, services and
works. The Contractor shall have full responsibility of the stability of the excavation and safety of the
workmen. If any slip occurs, the Contractor shall remove all slipped material from the excavated pit. All
loose boulders, semi-detached rocks, not directly in excavation but so close to the area to be excavated
as to be liable, in the opinion of the Engineer-In-Charge, to fall or otherwise endanger the workmen,
equipment of the work, etc., shall be stripped off and removed away from the areas of excavation. The
method used shall be such as not to shatter or render unstable or unsafe the portion which was
originally sound and safe. Any materials not requiring removal as contemplated in the work, but which,
in the opinion of the Engineer-In-Charge, is later to become loose or unstable shall also be promptly and
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satisfactorily removed as directed by the Engineer-In-Charge. Prior to starting the excavation, the
ground level at the location shall be checked jointly with the Engineer-In-Charge.
The rough excavation may be carried up to a maximum depth of 150 mm above the final level. The
balance shall be excavated with special care. If directed by the Engineer-In-Charge, soft and undesirable
spots shall be removed even below the final level. The extra excavation shall be filled up as instructed
by the Engineer-In-Charge. If the excavation is done to a depth greater than that shown on the drawing,
or directed by the Engineer-In-Charge, due to the Contractor's fault, the excess depth shall be filled up
to the required level (with cement concrete not leaner than M15 ordinary concrete or richer) as
directed by the Engineer-In-Charge in each individual case. In formation of rock requiring blasting, those
over cuts which are unavoidable will be made up by ordinary cement concrete M-15.
The contractor shall furnish labour, material, plant and equipment to complete excavation, filling,
backfilling, levelling, grading and compacting as indicated or specified herein or both.
The materials and workmanship shall conform to the provisions of IS: 1200 and IS: 3764. The excavated
materials shall be classified for payment according to IS: 1200.
Excavation shall be carried out in any material met on the site to the lines, levels and contours shown on
the detailed drawings, and contractor shall remove all excavated materials to soil heaps on site or
transported for use as filling on the site as directed.
Suitable types of shoring and strutting, wherever necessary, shall be adopted to support the face of
earth otherwise cutting in slope may be adopted as per site requirements and as directed by Engineer-
In-Charge.
The contractor shall provide suitable drainage arrangements to prevent surface water entering
foundation pits. The contractor shall engage pumps or other approved means to keep excavation free of
water.
If the bottom of any excavation has been left exposed by the contractor and that, in the opinion of the
Engineer-In-Charge, has become deleteriously affected by the atmosphere or by water, then the
contractor shall remove such portions of the deteriorated foundation material as the Engineer-In-
Charge may direct and shall make good with lean concrete mix decide by Engineer-In-Charge.
The contractor shall not undertake any concreting in foundation until the excavation pit is approved by
the Engineer-In-Charge,
Payment shall be made on cubic meter basis on the measurement of volume of pit of excavation as per
drawing permissible dimensions and slopes as specified by the Engineer-In-Charge and no separate
payment shall be made for shoring, strutting, dewatering and removal and disposal of surplus excavated
soil within a lead of 100 M from construction area. The rate shall include cost of setting out and Line out
work required for the excavation and cost of all shoring and dewatering work.
2) EXCAVATION IN ORDINARY SOIL, HARD SOIL AND SOFT AND DECOMPOSED ROCK
The excavation in ordinary soil, hard soil, soft and decomposed rock will be carried out as per the
approved proposal, modified and corrected where necessary by the Engineer-In-Charge. The work will
be carried out in a workmanlike manner without endangering the safety of nearby structures/services
or works and without causing hindrance to other activities in the area. As the excavation reaches the
required dimensions, lines, levels and grades, the work will be checked by the Engineer-In-Charge
thoroughly and on completion, the work will be finally checked and approved by the Engineer-In-
Charge. In certain cases, where deterioration of the ground, upheaval, slips, etc. are expected, the
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Engineer-In-Charge may order to suspend the work at any stage and instruct the Contractor to carry out
the balance work just before the foundation work of the structure can be started.
3) EXCAVATION IN HARD ROCK
In case where excavation, both in ordinary soil and hard rock, are involved, the ordinary soil comprising
of soft, hard and dense soils (including laterite formations) and rock including weathered rocks, lateritic
rocks, etc. which can be excavated without blasting, shall be completely stripped off. Further work in
hard rock shall be resumed after clearance from the Engineer-In-Charge.
Personnel deployed for rock excavations shall be protected from all hazards such as loose rock/boulder
rolling down and from general slips of excavated surfaces. Where the excavated surface is such that it is
not stable against sliding, necessary supports, props, bracings or bulkheads shall be provided and
maintained during the period of construction. Where danger exists of loose rock/boulder falling from
the excavated surfaces deeper than 2metres, steel mesh anchored to the lower edge of excavation and
extending over and above the rock face, adequate to retain the dislodged material shall be provided and
maintained. In case where blasting, though otherwise required, is prohibited for any reasons, the
excavation shall be carried out by chiseling, wedging or any other approved method.
4) CLASSIFICATION
All earthworks shall be classified under the following categories: No distinction will be made whether
the material is dry or wet.
a) Ordinary Soil
This shall comprise vegetable or organic soil, turf, sand, silt, loam, clay, mud, peat, black cotton soil, soft
shale or loose murrum, a mixture of these and similar material which yields to the ordinary application
of pick and shovel, rake or other ordinary digging implement. Removal of gravel or any other nodular
material having diameter in any one direction not exceeding 75 mm occurring in such strata shall be
deemed to be covered under this category.
b) Hard Soil
This shall include:
a) Stiff heavy clay, hard shale, or compact murrum requiring grafting tool or pick or both and
shovel, closely applied;
b) Gravel and cobble stone having maximum diameter in any one direction between 75 and 300
mm;
c) Soling of roads, paths, etc., and hard core;
d) Macadam surfaces such as water bound, and bitumen/tar bound;
e) Lime concrete, stone masonry in lime mortar and brick work in lime/cement mortar, below
ground level;
f) Soft conglomerate, where the stones may be detached from the matrix with picks; and
g) Generally any material which requires the close application of picks, or scarifies to loosen and
not affording resistance to digging greater than the hardest of any soil mentioned in (i) and (vi) above.
c) Soft and Decomposed Rock
It shall mean rocks such as lime stone, sand stone, weathered rocks, hard conglomerates soft
conglomerate where the stone may be detached from the matrix etc. which can be removed without
blasting and which can be quarried or split with crow bars, wedges, pavement breakers, pneumatic
tools etc.
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a) Limestone, sandstone, laterite, hard conglomerate or other soft or disintegrated rock which
may be quarried or split with crowbars ;
b) Unreinforced cement concrete which may be broken up with crowbars or picks and stone
masonry in cement mortar below ground level ;
c) Boulders which do not require blasting having maximum diameter in any direction of more than
300 mm, found lying loose on the surface or embedded in river bed, soil, talus, slope wash and terrace
material of dissimilar origin ; and
d) Any rock which in dry state may be hard, requiring blasting, but which when wet becomes soft
and manageable by means other than blasting.
d) Hard Rock (requiring blasting)
No blasting of rocks is permitted.
e) Hard Rock (blasting prohibited)
Hard rock where blasting is prohibited for any reason and excavation has to be carried out by chiseling,
wedging or any other agreed method. In case of any dispute regarding classification, the decision of the
Engineer-In-Charge shall be final.
5) PROTECTION
The Engineer-In-Charge shall be notified by the Contractor as soon as the excavation is expected to be
completed within a day so that it may be inspected by him at the earliest. Immediately after approval of
the Engineer-In-Charge, the excavation must be covered up in the shortest possible time. But, in no case
the excavation shall be covered up or worked on before approval and measurement by the Engineer-In-
Charge. Excavated material shall be placed beyond 1.5m from the edge of the pit or trench or half the
depth of the pit or trench whichever is more or further away if directed by the Engineer-In-Charge.
Excavation shall not be carried out below the foundation level of structure close by until required
precautions have been taken. Adequate fencing is to be made enclosing the excavation. The Contractor
shall protect all under-ground services exposed by excavation. The Contractor shall also divert all
surface drains, underground drains etc. affected by the excavation to maintain the working area neat
and clean.
6) DEALING WITH SURFACE WATER
All working areas shall be kept free of surface water as far as reasonably practicable. Works in the
vicinity of cut areas shall be controlled to prevent the ingress of surface water. No works shall
commence until surface water streams have been properly intercepted, redirected or otherwise dealt
with.
Where works are undertaken in the monsoon period, the Contractor may need to construct temporary
drainage systems to drain surface water from working areas.
7) TREATMENT OF SLIPS
The Contractor will take all precautions to avoid high surcharges and provide proper surface drainage to
prevent flow of water over the sides. These precautions along with proper slopes, berms, shoring and
control of ground water should cause no slips to occur. If however slips do occur due to causes beyond
the control of the Contractor, the same shall be removed by him and payment shall be made to him on
appropriate item rate of earthwork. Slips caused due to negligence of the Contractor will be cleared and
back-filled later by him.
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2.3 SHORING
Shoring made out of approved quality shall be 'close' or 'open' type, depending on the nature of soil and
the depth of pit or trench and the type shall be determined by the Engineer-In-Charge. It shall be the
responsibility of the Contractor to take all necessary steps to prevent the sides of trenches and pits from
collapsing.
2.4 BACK FILLING AROUND FOUNDATIONS AND PLINTH
1) GENERAL
The material used for backfilling shall consist of material, approved by the Engineer-In-Charge and
obtained directly from nearby areas where excavation work by the same agency is in progress, from
temporary stacks of excavated spoils or from borrow pits from selected areas designated by the
Engineer-In-Charge. The material shall be free from lumps and clods, roots and vegetation’s, harmful
salts and chemicals, organic materials, etc. In certain locations, the Engineer-In-Charge may direct sand
fillings. The sand should be clean, well graded and be of quality normally acceptable for use in concrete.
2) FILLING AND COMPACTION IN PITS AND TRENCHES AROUND STRUCTURES
As soon as the work in foundations has been accepted and measured, the spaces around the foundation
structures in pits and trenches shall be cleared of all debris, brick bats, mortar droppings, etc., and filled
with earth in layers not exceeding 250 mm in loose thickness each layer being watered, rammed and
properly compacted to achieve a dry density of not less than 90% of proctor's dry density at optimum
moisture content as per IS-2720 ( Part-VII) where backfilling with cohesive soil and sandy silt containing
high percentage of silt. For back filling with sand having little or no silt, each layer shall be compacted to
a relative density of 75% as per IS-2720 part XIV. Earth shall be rammed with approved mechanised
compaction machine. Usually, no manual compaction shall be allowed unless specifically permitted by
the Engineer-In-Charge. The final surface shall be trimmed and levelled to proper profile as shown in the
drawing and as desired by the Engineer-In-Charge. Since the degree of compaction depends on the
moisture content of the soil, a close watch should be kept on it and corrections done to optimise the
moisture content.
Back filling around completed foundations shall be done to the lines and levels shown on the drawings,
including any trimming of the surface as may be necessary. This will be done with selected and
approved Earth from excavation or otherwise with materials approved and directed by the Engineer-In-
Charge. Where sufficient suitable material is not available from the excavation, the Engineer-In-Charge
may direct to import suitable earth from different sources. The refilling shall be done in horizontal
layers of thickness not exceeding 25 cm free from pocket with careful watering and ramming to obtain
at least 90% maximum laboratory dry density.
The contractor shall not fill in around any work until it has been approved by the Engineer-In-Charge,
Payment for backfilling shall be based on volume of consolidated fill, this volume shall be derived from
the difference between the volume of excavation and the structure of trenches as the case may be. The
rate shall include cost of extracting suitable approved earth from excavated soil, carriage up to 100 M
lead, placing, watering, compacting in layers, trimming and dressing finished surface and disposal of
surplus material up to a lead of 100 M.
3) BORROW MATERIAL
Borrow material required for back-filling shall be excavated from approved locations and levels, and
shall consist of material, approved by the Engineer-In-Charge, free from roots, vegetation, decayed
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organic matter, harmful salts and chemicals, free from lumps and clods. If specified, clean graded sand
free from harmful and deleterious material from approved quarries shall be used as fill material.
4) FILLING IN PLINTH
Sand supplied by the contractor for filling shall be medium hard, strong, free from any organic and
foreign matter and should be suitable for attaining compaction of 90% of maximum laboratory dry
density; any sand proposed shall be used only after it is approved by the Engineer-In-Charge. Locally
available sand conforming to above specifications may be used for this purpose.
Filling shall be carried out in layers not exceeding 25cm in loose depth. If required, flooding shall be
done to achieve required compaction. Sand shall be compacted by tamping as directed by the Engineer-
In-Charge.
The plinth shall be filled with earth in layers not exceeding 250 mm in loose thickness, watered and
compacted with approved compaction machine or manually, if specifically permitted by the Engineer-In-
Charge. When the filling reaches the finished level, the surface shall be flooded with water for at least
24 hours, allowed to dry and then rammed and compacted, in order to avoid any settlement at a later
stage. The finished level of the filling shall be trimmed to the slope intended to be given to the floor.
5) FILLING IN TRENCHES
Earth used for filling shall be free from salts, organic or other foreign matter. All clods of earth shall be
broken or removed. Where excavated material is mostly rock, the boulders shall be broken into pieces
not bigger than 150 mm size in any direction, mixed with fine material consisting of disintegrated rock,
murrum or earth as available, so as to fill up the voids as far as possible and then the mixture used for
filling. Filling in trenches for pipes and drains shall be commenced as soon as the joints of pipes and
drains have been tested and passed. Where the trenches are excavated in soil, the filling shall be done
with earth on the sides and top of pipes in layers not exceeding 250 mm, watered, rammed and
compacted taking care that no damage is caused to the pipe below. Filling of trenches shall be carried
out simultaneously on both sides of the pipe in such a manner that unequal pressures do not occur.
In case of excavation of trenches in rock, the filling up to a depth of 300 mm or the diameter of the pipe
whichever is more, above the crown of pipe or barrel shall be done with fine material such as earth,
murrum, disintegrated rock or ash according to the availability at site. The remaining filling shall be
done with rock filling of boulders of size not exceeding 150 mm mixed with fine material as available to
fill up the voids, watered, rammed and compacted.
2.5 REMOVAL OF SURPLUS EARTH
Surplus earth and soil from excavation shall be removed from construction area to the area demarcated
by the Engineer-In-Charge.
1) DISPOSAL
The excavated spoils will be disposed off in any or all the following manners:
a) By using it for backfilling straightway.
b) By stacking it temporarily for use in backfilling at a later date during execution of the Contract.
c) By either spreading, or spreading and compacting at designated filling areas and / or disposal
areas.
d) By selecting the useful material and stacking it neatly in areas designated by the Engineer-In-
Charge for use in backfilling by some other agency.
All surplus material from excavation shall be carried away from the excavation site to designated
disposal area selected by the Engineer-In-Charge. All excavated materials such as hard rock, boulders,
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bricks, dismantled concrete blocks, etc. shall be stacked separately as directed by the Engineer-In-
Charge and shall be the property of the Owner.
2) FILLING IN DISPOSAL AREA
Surplus material from excavation which is not required for backfilling will be disposed of in designated
disposal areas. The spoils shall not be dumped haphazardly but should be spread in layers
approximately 250 mm thick when loose and compacted with the help of compacting equipment. In
wide areas rollers will be employed and compaction done to the satisfaction of the Engineer-In-Charge
at the optimum moisture content which shall be checked and controlled by the Contractor, which can
be done by tipping the spoils from a high bench neatly maintaining always a proper level and grade of
the bench.
2.6 DEWATERING
All excavations shall be kept free of water and slush. Grading in the vicinity of excavations shall be
controlled to prevent surface water running into excavated areas. The Contractor shall remove by
pumping or other means approved by the Engineer-In-Charge any water inclusive of rain water and
subsoil water accumulated in excavation and keeps the trench dewatered until the construction of
foundation structure and backfilling are complete in all respects. (Except where such dewatering would
need installation of well points or deep wells for which separate payment will be made) Sumps made for
dewatering must be kept clear of the foundations. Method of pumping shall be approved by the
Engineer-In-Charge but in any case, the pumping arrangement shall be such that there shall be no
movement of subsoil or blowing in due to differential head of water during pumping.
2.7 CONCRETE
1) GENERAL
All concrete work shall be carried out with automatic batching plant and transported through Transit
mixtures strictly in accordance with the IS: 456 except as otherwise specified hereunder.
2) GRADE OF CONCRETE
The different grades of concrete and the minimum cement content to be adopted are as per the
minimum requirement mentioned earlier in Clause 5.2 of General Parameter of Design. Accordingly
Design Mix of concrete shall be carried out and shall be used while construction. Cement used shall be
OPC 43 Grade/53 Grade conforming to IS: 8112/IS 12269 as per design and requirements. for shell
concreting, using slip form, and cement from the same source shall be procured till concreting is
completed for the shell.
The source and type of the basic ingredients of concrete viz. cement , aggregates, water and approved
admixtures, if any, shall be unchanged throughout the construction of the chimney shell, particularly in
case, slip forming technique is adopted for shell construction.
For slip forming, the slump shall be between 150 mm and 200 mm at the point of placement. However,
precise requirements in this regard shall be established from field tests and shall be subject to
Owner/consultant’s approval.
If necessary, approved admixtures such as retarders/ plasticizers to maintain the workability shall be
used with the prior consent of the Engineer-In-Charge. Such admixtures shall be identified after
preliminary tests to prove their satisfactory performance and compatibility with the particular type of
cement envisaged to be used in the shell construction. After identification and determination of dosage
for varying weather conditions, the total quantity of admixture required for complete work shall be
estimated and shall be procured in batches to ensure that the same is utilised before expiry of its shelf
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life. In no case shall the admixtures be used if its shelf life has expired due to delay in construction
activities. No additional payment shall be payable to Bidder for providing retarders/plasticizers.
Inter mixing of different grade of concrete in the same structure shall not be allowed normally.
While concreting shell at corbel/bracket levels for supporting beams care shall be taken to ensure that
the dowels are initially bent within the wall thickness and concrete of grade specified at that level is
placed and well compacted. The dowels may be later exposed by chipping only after the concrete is well
set. On no account will the method by packing the area with sand or any other material be permitted
for the purpose of exposing dowels at a later date.
3) CONCRETE MIX DESIGN
Any grades of concrete designated in IS: 456 shall be used. As far as possible design mix concrete shall
be used on all concrete work. That is, the concrete mix shall be designed with preliminary tests. The mix
shall be designed as per "Handbook on concrete mixers", SP: 23, BSI while designing the mix, the
strength, durability, minimum cement content, maximum water ratio allowed and workability necessary
for the job by most economical use of the various ingredients shall be considered by the Contractor.
The determination of the water-cement ratio and proportion of aggregates to obtain the required
strength shall be made from Preliminary Tests by designing the concrete mix. Controlled concrete shall
be used on all concrete works complying with all the requirements of IS: 456. Cube tests shall be carried
out by the contractor on the trial mixes before the actual concreting operations starts. The Engineer-In-
Charge shall verify the strength of the concrete mix before giving his sanction for its use. However, this
does not absolve the contractor of his responsibility as regards the prescribed strength of the mix. If
during the execution of the works it is found necessary to revise the mix because of the cube tests
showing lower strengths than the required one, the Engineer-In-Charge shall ask for fresh trial mixes to
be made by the contractor. No claim to alter the rates of concrete work shall be entertained due to such
changes in mix variations as it is the contractor’s responsibility to produce the concrete of the required
grade.
Design of Concrete mix shall be so done, that, it will be self-lubricated at the contact faces of the
shuttering plate to ensure smooth sliding. Cement used shall be 43/53 grade conforming to IS from
approved manufacturer. It is advisable to use cement from the same source during the entire slipping
operation, since, once the slipping system starts, there may not be any time left, for conducting trial
mixes, if the source is changed. Cement used shall have an initial setting time of not less than 50
minutes and should have specific surface area of not less than 3600 sq. cm per gram. From the point of
view of controlling creep, shrinkage as well as initial setting time of the concrete, quantity of cement
used shall be restricted to a maximum of 450 kg / m3 of concrete.
Necessary laboratory trials shall be conducted at site to arrive at a mix proportion for different grades of
concrete used in the construction of windshield. An optimum ratio of coarse and fine aggregate shall be
arrived at, to suit the purpose of strength, workability and durability.
Water cement ratio shall not exceed 0.45. Slump of concrete shall vary from about 150 to 200 mm
depending on the means of transportation of concrete to the site of placement. The initial setting time
of concrete shall be between 3 to 4 hours and final setting time, between 5 to 6 hours. To achieve the
above concrete parameters, retarding and plasticizing of admixtures of approved brand, may be added
during concrete manufacture to proportions recommended by the manufactures, to ensure that
necessary fluidity and workability is achieved without compromising on strength. The admixtures shall
be properly identified by preliminary test both for desired performance as well as compatibility with the
brand of cement to be used.
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In case, concrete is transported by transit mixers, the waiting period of concrete inside the mixer shall
be reduced to the possible minimum to limit the heat of hydration.
A small laboratory shall be maintained at site for testing different materials like cement, coarse and fine
aggregates. A cube testing machine also be installed at site for getting quick feedback on concrete
quality. Steam curing facility for cubes shall also be provided.
4) BATCHING OF CONCRETE
For controlled concrete, only weigh batching shall be allowed. All concrete ingredients, except water,
shall be batched by weight, using an approved make of weigh batcher. Batching shall be accurate to 1/2
Kg. The batcher shall be tested for accuracy of calibration, first before commencement of work and at
least once a fortnight or as directed by the Engineer-In-Charge thereafter. Water shall be batched by
weight or by volume measures, as approved by the Engineer-In-Charge.
5) MIXING
Mixing should be carried out in mechanical mixers or batching plant. Hand mixing shall not be
permitted. Water cement ratio shall be rigidly controlled during mixing. Mixers shall be fitted with
automatic devices to discharge measured quantity of water to the mixing pan. The water shall not be
admitted to the drum until all the cement and aggregate constituting the batch are thoroughly mixed.
Regular checks on mixer efficiency shall be carried out as directed by the Engineer-In-Charge.
The mixing equipment shall be capable of combining the aggregates, cement and water within the
specified time into a thoroughly mixed and uniform mass, and of discharging the mixture without
segregation. The entire batch shall be discharged before recharging. Mixing periods shall be measured
from the time when all of the solid materials are in the mixer drum, provided that all of the mixing
water shall be introduced before one fourth of the mixing time has elapsed. Mixing shall be continued
until there is a uniform distribution of the materials and the mass in uniform in color and consistency.
The mixing time in no case shall be less than two minutes.
Only those mixers whose efficiencies are within the tolerances specified in IS: 1791 will be allowed to be
employed. Batching plant shall conform to IS: 4925. The entire content of the drum shall be discharged
before the ingredients for next batch are fed into the drum. No partly set or remixed or excessively wet
concrete shall be used. Such concrete shall be immediately removed from site. Each time the work stops
the mixer shall be thoroughly cleaned and when the next mixing commences, the first batch shall have
10% additional cement at no extra cost to the Owner to allow for loss in the drum.
Great care shall be exercised when mixing the actual works concrete using the proportions of the
selected trial mix. The final concrete mix shall have the same weight proportions of cement, fine
aggregates, coarse aggregates and water as the approved selected mix.
Proper control of water quantity is deemed of paramount importance, Mixers with automatic water
measuring drums shall be used, or else water should be either measured by volume in calibrated
buckets, tins, or weighed. All measuring equipment shall be maintained in a clean serviceable condition,
and their accuracy periodically checked and certified and Engineer-In-Charge's approval obtained.
The Engineer-In-Charge may require the contractor to carry out moisture content tests in both fine and
coarse aggregates. The amount of the added water shall then be adjusted to compensate for any
observed variations in the moisture contents. For the determination of moisture content IS: 2386 shall
be referred to.
No substitutions in materials used on the work or alterations in the established proportions shall be
made without additional tests to show that the quality and strength of concrete are satisfactory. No
alterations shall be permitted without the prior sanction of the Engineer-In-Charge.
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6) PLACING
Before concreting, the contractor shall provide, fabricate and lay in proper position all Metal inserts,
Anchor Bolts, pipes, etc. (which are required to be embedded in concrete members) as per relevant
drawings and direction of Engineer-In-Charge
Concrete shall be transported from the mixing plant to the forms as rapidly as possible by means which
will prevent segregation, consolidation or drying out in hot weather. Concrete shall be placed within
thirty (30) minutes after commencement of mixing. At the time of placing concrete in very hot weather,
care shall be taken to see that the temperature of wet concrete does not exceed 380C. Before placing
concrete, all formwork, embedment and reinforcement shall be checked for completeness, location,
dimension. It should also be in square and plumb. All chips and saw dust or other foul matter shall be
removed from within the forms. The base surface shall be well moistened and puddles wiped up. Earth
foundation on which direct placement of concrete is allowed will be rammed and consolidated as
directed by the Engineer-In-Charge such that it does not crumble and get mixed up with the concrete
during or after placement, before it has sufficiently set and hardened. Concrete will always be placed
against moist surface but never on pools of water. In case the foundation cannot be dewatered
completely, special procedure and pre-caution, as directed by the Engineer-In-Charge will have to be
adopted. A layer of mortar of thickness between 12 mm to 25 mm as directed, of the same or less W/C
ratio and the same proportion as that of concrete being placed and /or cement slurry will be spread
thoroughly on the foundation or construction joint just prior to placement of concrete. The cost of
application of such cement slurry and/or mortar will be deemed to be included in the unit rate of
concrete. Placing equipment and accessories shall be kept clean and free of partially set grout and
concrete, and maintained in proper working order. Walking on reinforcement layers is not permissible.
Walkways of wooden planks or similar devices can be placed with removal supports and should be
independent of reinforcement. In general, placing shall be direct, by transporting buckets. Where it is
necessary to deposit the concrete at level differences of more than 1.5 m, short chutes shall be used.
Short chutes and hoppers shall be so designed and installed that segregation will not take place. In cases
where chutes are impracticable due to excessive drop to placing level, hoppers and sectional tubes
(elephant trunks) shall be used. After the concrete has been placed, it shall be spread, if necessary and
thoroughly worked around reinforcement or other embedded fixtures into concrete form and shape.
The concrete shall in no case be dropped from a height of over 1.5M and it shall be carefully laid in
position. Before depositing the concrete, all debris and dirt shall be removed from the space to be
occupied by concrete. Concreting shall not be done unless the formwork conforms to the shapes, lines
and dimensions as shown in the drawings. The formwork shall be sufficiently rigid. During the placing
and compaction of concrete, care shall be taken to ensure that there is no loss of liquid from concrete
and no segregation of aggregates takes place. The method of placing and compaction employed in any
particular section of the work shall be as desired by the Engineer-In-Charge.
Vibrators shall not be used for pushing the concrete into the adjoining areas. Care must be taken to
ensure that the inserts, fixtures, reinforcement and formwork are not displaced during or immediately
after the placement and bring the concrete surface out of the alignment beyond tolerance limits. In case
of such displacements the Engineer-In-Charge may direct to remove the portion and reconstruct or
repair the same at the Contractor's expense. The rate of placement of concrete shall be such that no
cold joint is formed and fresh concrete is placed always against green concrete which is still plastic and
workable. No concrete shall be placed in open, while it rains. During rainy season, no placement in open
is to be attempted unless sufficient tarpaulins or other similar protective arrangement for complete
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covering the still green concrete from rain is kept at the site of placement. If there has been any sign of
washing of cement and sand, the entire affected concrete shall be removed immediately.
The concrete shall not be placed directly against a vertical form face but shall be placed to flow to this
surface during the compaction process. Care shall be taken to avoid the form face being splashed with
mortar during the placing operation.
Concrete shall be placed in horizontal layers of proper depth for effective compaction and depth of a
layer shall not in any case exceed 400 mm. Each layer of concrete shall be plastic when covered with the
following layer. Plastic concrete is defined as concrete which can be vibrated at least to the extent that
immersion type vibrators spud will penetrate the concrete at least 25 mm by vibration action and under
its own weight. Minimum compressive strength, after 5 to 6 hours of batching, of concrete, immediately
below the shutter as the slip form proceeds shall not be less than 0.2 MPa. For shell concreting, forms
shall be filled at a rate of vertical rise of not less than 150 mm per hour and not more than 300 mm per
hour. Construction joints shall be provided as specified and approved by the Engineer-In-Charge.
Concrete which is no longer plastic but which needs to be covered by an additional lift shall be
immediately chipped back to well consolidated concrete and slushed with mortar puddle. This mortar
puddle shall cover the hardened concrete to a depth of 1.5 mm at every point and shall have cement
and sand in the same ratio as in the concrete mix itself.
At all times when reinforced concrete is being placed a competent steel fitter shall be in continuous
attendance. Fitter shall adjust and correct the position of any reinforcement, which may be displaced.
Any concrete surplus to immediate requirements shall be thrown away. In no circumstances may the
surplus concrete be used later.
7) COMPACTION
Concrete in general shall be consolidated by vibration using high frequency mechanically driven
vibrators. Concrete shall be placed in layers at least 300 mm deep in walls and approximately 450 mm in
mass pouring. Vibrators shall not penetrate more than 50 mm into the surface of previously placed
layers but shall completely vibrate the working layer. Care shall be taken not to over vibrate any
concrete and especially those with higher slumps. Under no circumstances vibrators shall be attached to
or allowed to touch reinforcement. Spare vibrators in good operating condition shall be on hand during
placing operations.
The concrete after being laid shall be compacted by means of vibrators of approved type under proper
supervision as directed by the Engineer-In-Charge. Vibration shall not be confined only to the top
surface, but the whole mass of concrete shall be well vibrated until the dense mass assumes jelly like
appearance and consistency water just appearing on the surface. Over vibration of very wet mixes shall
be avoided. Care should be taken to avoid segregation and formation of air bubbles.
The whole process starting from the mixing of concrete to the placing and compaction shall not take
more than 20 minutes and the process shall be completed before the initial setting takes place,
Concrete shall be thoroughly compacted by suitable mechanical vibrators during placing and shall be
carefully worked around all reinforcement and embedded fixtures and in to the side and corners of the
formwork.
Compaction shall start as soon as there is sufficient concrete within the formwork to immerse the
vibrator and vibration shall continue during the placing operation so that at no time shall there be a
large volume of un compacted concrete in the form work.
Whenever, concrete is being vibrated at least one spare vibrator of each type in use shall be available in
case of breakdown.
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8) FINISHING
No touching-up will be permitted to the concrete after removal of formwork. Where damages, honey-
combing or other unsatisfactory finishes have occurred to the concrete surfaces, they shall be rectified
in a manner as directed by the Engineer-In-Charge, at no extra cost. If in the opinion of the Engineer-In-
Charge the concreting is unsatisfactory, demolition of the entire concrete work and reconstruction of
the same shall be carried out by the Contractor, as directed by the Engineer-In-Charge at his own cost.
On striking the formwork, all blow holes and honey combing observed shall be brought to the notice of
Engineer-In-Charge. The Engineer-In-Charge may, at his discretion allow such honeycombing or blow
holes to be rectified by necessary chipping and, packing or grouting with concrete or cement mortar. If
mortar is used, it shall be 1:2 mix or as specified by the Engineer-In-Charge. However, if honey-combing
or blowholes are of such extent as being undesirable, the Engineer-In-Charge may reject the work
totally and his decision shall be binding. No extra payment shall be made for rectifying these defects or
to recast the same. All burrs and uneven faces shall be rubbed smooth with the help of carborundum
stone.
The surface of non-shuttered faces shall be smoothened with a wooden float to give a finish equal to
that of the rubbed down shuttered faces. Concealed concrete faces shall be left as form finished
detailed above. The top faces of slabs which are not intended to be surfaced shall be levelled and
floated to a smooth finish at the levels or falls shown on the drawings or elsewhere. The floating shall
not be executed to the extent of bringing excess fine materials to the surfaces. The top faces of slabs
intended to be covered with screed, granolithic or similar faces shall be left with a rough finish.
For top surfaces of slab and other surfaces for which formwork is not provided a smooth finish shall be
provided with a wooden float after compaction.
9) CONSTRUCTION JOINTS
In general, construction joints shall be limited to those indicated on the drawings. In mass concrete,
construction joints may not be indicated in the drawings but shall be made at breaks, offsets or other
convenient levels as controlled by volume, plant capacity and time factors. Such construction joints shall
be so located that they do not impair the strength of the structure. In walls and columns, height of each
lift shall not generally exceed 1.5 m unless otherwise specified in the drawings or directed by the
Engineer-In-Charge. Method of forming all construction joints shall conform to the provisions of IS: 456.
All construction joints shall be cleaned with wire brush and water to remove all laitance and loose
material to expose the aggregates. Immediately before placing fresh concrete, the surface of previously
placed concrete shall be coated with a thin coat of cement mortar slurry of the same proportion as that
of concrete.
In general, construction joints shall be located preferably in a low shear stress zone and at right angles
to the direction of the principal stress. Any deviation from the above shall be approved by the Engineer-
In-Charge.
As soon as the concrete has hardened sufficiently, it shall be covered either with sand, Hessian, canvas
or similar materials and kept continuously wet for at least seven (7) days after final setting. Curing by
continuous sprinkling of water will be allowed if the Engineer-In-Charge is satisfied with the adequacy of
arrangements made by the Contractor.
Construction Joints shall in general confirm to the relevant causes of IS: 456. Such joints shall be truly
vertical or horizontal as the case may be, except that in an inclined or curved member the joint shall be
strictly at right angles to the axis of the members.
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Construction joints shall be rebated to an approved profile and an approved water stop shall be inserted
in the joints when specified.
Construction joints shall be made horizontally at the top of the foundations and 75 min below the
lowest beam soffit at the head of columns. Concrete in the ribs and slabs of small tee and all other
beams shall be placed in one operation, but for large beams concrete in the rib up to a level 25mm
below the slab, soffit shall be placed first. Concrete in haunches or splays on beams or braces and
concrete in the head of adjoining portion of the column shall be placed at the same time as that of the
beams or braces. Concrete in splays at the junction of walls and slabs shall be placed at the same time
as that of the slab.
Construction joints shall be arranged to minimize the effect of shrinkage. Generally, the distance
between joints shall not exceed 10 meters. Unless otherwise directed by the Engineer-In-Charge, the
construction joints in girders, beams and slabs shall be positioned at approximately one third of the
span from a support.
10) CURING
Curing shall be accomplished in accordance with IS : 456 by keeping the concrete covered with a layer of
sacking canvas, Hessian or similar absorbent materials and kept constantly wet for at least seven days
from the date of placing of unless otherwise specified. The approval of the Engineer-In-Charge shall be
obtained for the method of curing the contractor proposes to use on the work. In very hot Weather
precaution shall be taken to see that temperature of wet concrete does not exceed 38oC while placing.
Heavy loads shall not be placed on or moved across floor slabs until curing is complete. Care shall be
taken to prevent floor surfaces from being marked during curing period. For freshly laid concrete
formwork shall not be jarred.
Exposed surfaces, immediately after final set, shall be protected from the sun. All concrete shall be well
watered after it has been set and shall be kept continuously damp until thoroughly cured. Provision
shall be made for adequate water distribution to all parts of the work so that if required this treatment
can be continued sufficiently throughout the whole period of construction. In order to keep the
concrete continuously damp, all exposed surface shall be covered with continuously damped gunny
bags or shall have water pounded on them, for full period of curing.
On exposed concrete surfaces in high sun temperatures and /or strong drying wind conditions BIDDER
shall use curing method, which also shields the concrete, and this shall be placed in position not later
than half an hour after final tamping.
11) CHIMNEY FOUNDATION
Concreting of foundation (raft) shall be started only after the steel reinforcement for the entire
foundation has been placed and tied in position. The reinforcement bars shall be adequately supported
to ensure that they do not sag under their own weight. The supporting reinforcement system shall be
properly engineered to prevent sagging of all main reinforcement. Measures shall also be taken at
sufficient number of points over the placed reinforcement to ensure this requirement.
Concreting of the foundation shall be carried out in segments as approved by the Engineer-In-Charge.
Only vertical construction joints with joggles shall be permitted between any two segments. Dowel bars
shall also be provided between two adjoining segments. Horizontal construction joints shall not be
permitted for the foundation under any circumstances.
Each foundation segment shall be cast in a single continuous pouring operation. The vertical sides and
joggles of the already cast segment shall be roughened and fully prepared (for receiving fresh concrete)
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as per specification and to the satisfaction of the Engineer-In-Charge, before concreting works for the
adjacent segment are undertaken.
The Contractor's procedures, for casting massive concrete sections (like raft foundation segments) shall
take into account early thermal drying and shrinkage behaviour of such works to prevent cracking or
loss of strength of concrete due to these effects.
At least 4 weeks before commencing the construction of any massive concrete section the Contractor
shall submit, for Engineer-In-Charge's approval, detailed proposals for placing the concrete, together
with supporting calculations to ensure that there shall be no damage to the concrete resulting from the
proposed method. The proposal shall include the location of construction joints, the .sequence and
programme of concrete pouring, formwork details and striking time and method of controlling
maximum temperatures and temperature gradients and evaporation rates during the early age of the
concrete.
Foundation concrete shall be moist/ damp cured, for at least ten days by water spraying or ponding as
approved by the Engineer-In-Charge. All exposed surfaces, edges and corners of the foundation shall be
sufficiently and continuously kept damp with ample supply of water
12) CHIMNEY SHELL
The chimney shell shall be constructed using slip form shuttering and the norms, precautionary and
remedial measures with respect to the rates of sliding, delay in sliding, discontinuous (or stop start)
sliding, curing, protection, finishing, providing for opening and embedment’s and maintaining true
vertically shall be strictly adhered to. All measures shall be subject to the approval of the Engineer-In-
Charge.
Vertical reinforcement bars projecting above the forms for the chimney shell shall be so supported as to
prevent the breaking of the bond between the freshly placed concrete.
Vertical joints shall not be permitted in the chimney shell and horizontal construction joints may be
provided at locations as approved by the Engineer-In-Charge.
Special attention shall be given to proper curing of the chimney shell so that the shell wall does not
remain dry for long periods. Circumferential perforated pipes shall be hung from the slip form
shuttering. Water shall not be turned into the pipes until the concrete has set sufficiently to prevent
water channeling. Alternatively, both faces of the concrete shell shall be coated with a membrane
curing compound in accordance with ACI-307. The curing compound shall comply with ASTM C 309 and
shall be applied in strict accordance with the Manufacturer's recommendations. Care should be taken to
ensure that the curing compound is applied uniformly and consistently and shell is not damaged or
punctured.
2.8 FORMWORK & CENTERING
Form work in general shall conform to IS: 456. For complicated work the contractor shall submit his
proposal of formwork before starting the work for approval of the Engineer-In-Charge. The number of
props, their sizes and dispositions shall be such as to be able to safely carry the full dead load and
constructional loads. However, approval of the Engineer-In-Charge to this effect shall not relieve the
contractor of his responsibility for proper work and safety. All forms of beams, slabs and members shall
be so designed and erected that the sides can be removed without disturbing the soffit shutter and
supports there to. Before removal of the shuttering the concrete shall be examined and its removal
order taken from the Engineer-In-Charge. In no circumstance shall forms be struck until the concrete
reaches strength of at least twice the stress to which the concrete may be subjected at the time of
striking. Shuttering shall not be removed until the number of clear days specified in IS: 456 have elapsed
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since the last day of placing concrete in the member concerned. All formwork shall be removed without
such shock or vibration as would damage the reinforced concrete. Before the soffits and struts are
removed, the concrete surface shall be exposed, where necessary, in order to ascertain that the
concrete has sufficiently hardened. The specified period may be extended if desired by the Engineer-In-
Charge on account of delayed hardening caused by low atmospheric temperature.
Formwork shall conform to the shape, lines and dimensions of concrete and RCC Structures as shown on
the drawings and shall be well within the permissible tolerances. They shall be of sufficient strength and
rigidity to maintain their position and shape under loads incidental to placing concrete. The
arrangement and alignment of formwork shall be approved by the Engineer-In-Charge prior to
concreting. However, this shall not relieve the contractor from his responsibility of doing accurate work
and rectifying the defects.
Formwork for concrete shall be of plywood, steel, good seasoned timber or other approved materials as
directed by the Engineer-In-Charge properly designed, easy for removal and cleaning. It shall be
sufficiently tight to prevent loss of cement slurry from the concrete. All joints and holes in the formwork
shall be caulked with putty, jute cloth or other approved materials. The inner face of the shuttering shall
be cleaned and thoroughly wetted or greased with approved material. Care shall be taken that such
coating is kept free from contact with the reinforcements. All form work shall be leveled and aligned
and all rubbish, particularly, chipping, wood shavings, saw dust and adhering grout shall be removed
from the interior of the form before the concrete is placed.
Form work ties, or tying methods, which can cause spalling of concrete during stripping or any rust or
discoloration on concrete exposed to view, shall not be used. Spreaders and tie wires shall be cut back
at least 1/2" from surface and damage to concrete neatly patched.
Formwork panels shall be stiff enough to prevent damage to the concrete surface caused by excessive
movements of the panel during vibration of the concrete.
Damaged and used formwork shall not be re used without repairing.
The part of the ties shall be capable of being removed, so that no part remaining embedded in the
concrete shall be nearer the surface of the concrete than the specified thickness of cover to the
reinforcement. Holes left after the removal of ties shall be filled with concrete or mortar of approved
composition.
The formwork or the false work shall not be removed from a structural component until BIDDER ensures
that the concrete has attained sufficient strength.
The concrete is to be regarded as sufficiently hardened when the component has attained such strength
that it can resist all loads acting at the time of removal of the formwork.
Particular care shall be taken with components which have to carry virtually the full design load directly
upon removal of the false work (e.g. in the case of roofs, or floor slabs which have to support loading
from floors above them which have not yet hardened).
Props shall remain in position for as long a period as possible, particularly for structural components,
which are subjected to a major proportion of their design loading as soon as the formwork has been
removed.
No superimposed load shall be allowed on any part of the concrete work prior to the removal of the
forms and props.
2.9 SHELL CONSTRUCTION USING SLIP FORM TECHNIQUE
1) GENERAL
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Chimney shell shall be constructed using slip form technique based on “Method Statement” prepared
by the Bidder and duly approved by Owner/consultant generally following the guidelines given in
tender.
2) SLIP FORM
The RCC shell of the chimney shall be constructed by using slip form technique. The slip form shall
consist of a central ring and tower system. Normally the slip form shall be of radial beam system having
two levels of beams, upper and lower level beams, radiating out from the central ring beams to the slip
form yokes equally spaced around the circumference of the structural wall.
The lower beams shall be made up of handlable standard unit trusses bolted together to make up the
required start diameter. To accommodate the wall taper the beams are shortened by removing units as
the slide proceeds.
The bottom beams shall be further supported by under trussing. A Radial Control gear by which the
radius of the concrete shell is controlled shall be attached to the outer ends of the upper and lower
beams. This shall be activated automatically or manually linked to the upward movement. The slip form
shall preferably have at least two working platforms at lower radial beam level as a main working deck
and for access to the hoist cage and at the upper radial beam level as a control point for the radial and
batter adjustments at the yoke positions.
Access to the shutters and to the concrete surface shall be provided by a circular platform under the
lower radial beam for the inner surface and by a three level circular platform supported from the outer
yoke posts for the outer surface.
A special safety net consisting of man-carrying-mesh with a smaller mesh for materials shall be provided
to envelope both the outer platforms and the inner hung platform.
Shuttering shall be of standard lap sheets hung from high tensile steel rod walers, threaded through
holes drilled in the yoke posts.
Steel embedment, chases and openings as per approved drawings shall be fixed or formed in the shell
where steel frames are used for openings, they shall be rigid, reassembled and fixed in position. For
small openings wooden frames may be used.
The spacing of jack rods shall not be more than 1 m or as approved by Engineer-In-Charge. The jack rods
shall be left (no retrieval of jack rods is allowed) in concrete and they shall not be figures as
reinforcement.
Jacks used in Hydraulic Jacking system for slip form shall conform to relevant Indian Standards.
An accurate height measure shall be installed.
The Contractor shall furnish with his bid complete details and literature of the slip form he proposes to
use for the concreting of the shell.
The Contractor shall be responsible for the safe operation of the slip form and the safety of the labour,
supervisory staff, others during the concreting of the shell by providing hand railing around the
platforms, Intercom arrangement, lighting (500 to 1000 lamps with reflectors shall be provided, fixed on
scaffold tubes attached to the yokes, 3m to 4.5 m above the working deck and 4.5m to 6 m apart), etc.
In case of power failure, battery operated emergency lights on working deck shall be provided.
The Contractor shall also provide all arrangements like hoists, winches, chutes etc. required for the
transport of the materials to the working platforms.
Ambient temperature and the resultant impact on the concrete temperature at the time of placement
shall be taken into account while deciding the speed of the slip form. If slip forming is to be carried out
in summer, (April to September) slip-forming speeds up to 250 mm per hour may be used. In case lesser
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values are contemplated, retarders conforming to relevant Indian Standard Codes and approved by the
Engineer-In-Charge shall be used.
The Contractor shall ensure that no dragging of concrete with the upward movement of the slip form
shall occur. Twisting in the horizontal plane of the slip form assembly and tilting in the vertical plane of
the slip form assembly shall not be allowed. The Contractor shall be responsible for any such
occurrences and he shall have to make good for these as per the directions of the Engineer-In-Charge at
no extra cost.
Following guide lines, apart from the other mentioned elsewhere in this document, are being presented
which should be kept in view by intending Bidders, while quoting for Slip-form method of construction,
a) Care to be taken to prevent dragging of Concrete along with upward movement of the
shuttering for this purpose the following steps are advisable
i) Shutter plates have to be smooth and should be thoroughly clean. Before fixing them in position
all the Surfaces which will be coming in contact with concrete to have a coat of epoxy paint.
ii) In areas where concrete thickness is 750mm or more rate of pouring should be such that
minimum slipping of shuttering is 100mm per hour.
b) Mix design also should be so done that it has a slump of 50mm at the point where concrete is
placed under an ambient temperature of around 380C. This will also keep vibration by needle vibrators
to required minimum. Slump should not drop down to zero in less than 45 minutes.
c) Care must be taken to prevent twist, which predominantly occurs in the initial stages because of
low slipping rate in the horizontal plane of Slip-form assembly. A thorough check on this aspect must be
kept at every 15 minutes interval. One person should exclusively be assigned this work together with
rectifying any defect.
d) Every endeavour has to be made so as not to occur at any tilt in the shutter assembly. To
achieve this following step need be taken.
i) Performance of jacks has to be closely observed and any defective one needs immediate
replacement. Difference in levels of opposite jacks at any instant of time should not exceed 5mm.
ii) Loading on Slip-form truss/yokes has to be fairly equal.
iii) Sleeve through which jacking rod passes to be of sufficient length so that later gets an uniform
clearance and does not get any chance to tilt. Sleeve should have a minimum wall thickness of 3.25mm
and should be such that jacking rod gets a maximum clearance of 1mm to 1.5mm around.
e) For taper walled chimneys overlapping of shutters, which are kept, to effect the tapering, needs
careful attention otherwise these may be filled with concrete slurry.
f) In designing the mix following aspects should be borne in mind:
i) Cement used should have an initial setting time of not less than 50minutes and preferable
should have a specific surface around 3600 Sq.m. per gram.
ii) From the point of view of creep, shrinkage as well as initial setting property of concrete, cement
content should not preferably be more than 400Kg per cum. of concrete.
g) Elaborate arrangements shall be made for curing of the shell. It is always advisable to have a
standby pump for effective utilization of the system.
h) Exact number and capacity of jacks as well as spacing of yoke frames are to be determined
taking into account various loading including self-weight of the system, dead and live loads on working
and other platforms, horizontal load on form work, wind load etc. It is desirable that jacking system,
based on which the entire slip-form system works should consist of jacks 3/6 Ton capacity and a
hydraulic pump with necessary pipe connections.
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i) At least 30% spare jacks and jacking rods should be kept ready during the entire operation. It is
obligatory to maintain spare hydraulic pump along with a set of loose pipes in perfect working condition
on top of working deck.
j) In sectors where thickness is 500mm or more it is prudent to go in for two nos. of jacks for each
slip-form yoke.
k) For effective utility of this technique following areas need careful attentions at the very
conceptual stage:
i) Detailed quality assurance program.
ii) Advance Planning and preparations.
iii) Arrangement for onsite supervision and adequate access facilities.
l) Construction methods including description and types of different equipment proposed to be
used, structural arrangement and analysis of the system, description and type of difference materials,
planned interruptions, description and frequency of various checks and tests for slip-form technique as
well as for material, method of preparing, transporting and pouring of concrete, solution for probable
defects during slipping, sequence of operations during planned interruptions etc. should be prepared
beforehand by Contractor and to be approved by Engineer-In-Charge before starting the actual work.
m) Placing and binding of reinforcement is also a very critical item and needs special attention.
From practical considerations not more than two or three layers of horizontal steel can be tied at a time
and this causes a definite limitation in placement of reinforcement. Vertical reinforcements should be
kept vertical by providing suitable holders within the slip-form system.
n) It is desirable to have a break of at least one day for every two weeks of continuous operation.
Such break should be utilized for various maintenance activities, removal of jack rods etc.
o) Number and locations of hoists for lifting concrete, reinforcement and other materials have to
be planned well in advance. Capacity of hoists should be such as to match with hourly requirement of
concrete and reinforcement. If feel necessary, one hoist may be exclusively earmarked for transporting
concrete. For movement of personnel supervising the work a separate hoist must be arranged for, so
that two hoists should be available throughout the construction period. Access between various
working levels shall be provided by an approved system of ladders.
p) The system being operative round the clock it is obligatory to have adequate lighting
arrangement both on various platform levels as well as on ground below. Arrangement has to be made
for facilitating continuous upward movement of the entire system along with slip-form.
q) Winches for lifting men and material and mixers, if located within unsafe area around chimney,
should be protected by adequate shelter from possible damage.
r) Proper Tele-communication system has to be established between the personnel working on
top of chimney and control room below.
s) Apart from using plumb bobs, level and theodolite instruments/ Total station, for survey
purpose arrangement should also be kept for lasers.
t) In case of interruption in the course of slipping of form work following measures should be
taken,
i) Provision of a key and additional reinforcement at the junction of new and old concrete.
ii) Slip-form system should be brought up freely to have a minimum overlap of 100mm or so over
previously cast concrete.
iii) Washing of old concrete surface with compressed air and water jet and thereafter pouring a
layer of neat cement grout.
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iv) Clearing of shuttering panels of loose materials concrete etc., by compressed air and applying a
coat of epoxy paint, if felt necessary by Engineer-In-Charge.
v) Neatly finishing the interface of old or new concrete as soon as it comes out of shutter panel.
Should jacking rod be located at any of the opening, temporary R.C.C column shall be designed and
provided to prevent bucking of the rod. The temporary column should be to full thickness of the wall
and at least 500 mm long or to ensure a height / length ratio not less than 12.
The contractor shall have at site qualified engineers and supervisors/foreman's with at least 10 years of
experience in execution of minimum 2 of similar works, and operators of machinery and equipment for
satisfactory progress and timely completion of the works. All temporary electrical installation shall be
supervised by a qualified electrical engineer of the contractor.
The contractor shall be fully responsible for the correctness and accuracy of the works, which shall be
executed in a professional manner.
Climbing or slip-forms shall be controlled by linked hydraulically operated jacks that are reversible,
driven by an electrically operated pump and with provision for manual operation in the event of a break
down.
When correcting dimensional deviations in any vertical plane through the setting out point, within the
tolerances as specified herein, the shell profile shall not change direction, other than in accordance with
the required batter and rise, by more than 10mm per 5 meter rise. Stepping of succeeding concrete lifts
shall not be permitted.
The rate of spiralling of the shutter shall not exceed 10 mm circumferential rotation per 1 M of vertical
travel. The maximum continuous deviation in either direction shall not exceed 50 mm.
All pockets, chases, rebates, openings, corbels and similar built-in features shall have their vertical and
horizontal surfaces positioned within ±10 mm of the specified location or level. Notwithstanding these
stipulated tolerances no resultant pocket, chase, etc. shall be of such a reduced or increased size that it
is unsuitable for the purpose for which it is designed.
3) RATE OF SLIDING
Sliding shall proceed continuously at a rate of between 150 mm and 300 mm per hour as approved by
the Engineer-In-Charge. No stoppage during sliding longer than 15 minutes will be-permitted. The
shutter shall be kept as full of concrete as possible with the surface of the concrete maintained level.
The rate of movement of the sliding formwork shall not be such as to allow the concrete to adhere to
the surface of the shutter. If Slip-forming is carried out in summer, rate of slipping should be around
250mm per hour. If lesser value is contemplated appropriate retarders should be specified.
4) DELAYS IN SLIDING
If interruptions in the slide occur as a result of circumstances completely beyond the control of the
Contractor, e.g. power failures or weather conditions, or on the instructions of the Engineer-In-Charge,
special arrangements must be made to avoid adhesion of the setting concrete to the sliding formwork,
and if such adhesion takes place, to break it in such a fashion that the uppermost layers of concrete are
not cracked or lifted. Jacks shall enable the formwork to be lowered 12 mm to 25 mm but any method
of breaking such adhesion will depend on the type of sliding equipment used by the Contractor.
Should interruptions occur, a construction joint shall be formed in a manner which will least impair the
durability, appearance and proper functioning of the concrete. The sliding shutter must be lowered
before new concrete is poured so as to avoid a stepping effect in the face of the wall. In recommencing
the pouring operation particular care should be taken that no adhesions have occurred which will "lift"
new concrete. Should adhesions cause cracks, they must, immediately be brought to the attention of
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the Engineer-In-Charge and suitable remedial works must be undertaken. Such remedial works must be
approved by the Engineer-In-Charge before proceeding.
Should the slide be continued within a period of 24 hours of stoppage, all laitance must be removed
from the surface of the construction joint before any fresh concrete is added.
Should the slide be continued after a period of 24 hours has elapsed the procedure outlined below shall
be followed.
Hack away any projecting stones or fines of concrete and cut back to solid concrete to the satisfaction of
the Engineer-In-Charge. Remove any mortar leakage which may have occurred. Clean away all loose
materials and thoroughly damp the old surface. The first concrete mixture to be deposited in the
shutters shall contain between 7 % to 10 % additional fine aggregate with a corresponding reduction in
coarse aggregate related to the mix.
5) DISCONTINUOUS OR STOP START SLIDING
Where a sliding system on a stop-start basis is used, the construction joints formed when stopping shall
be at positions agreed with the Engineer-In-Charge. Such joints shall be formed and prepared in
accordance with this Specification. Where trailing shutters are used in conjunction with the stop-start
slide these shall be securely fixed to or suspended from the remainder of the formwork.
6) OPENINGS, CHASES AND FIXING OF BLOCKS
No holes or chases other than those shown on the working drawings or approval by Engineer-In-Charge
shall be cut or otherwise formed in the concrete. The method the Contractor proposes for the forming
of any holes shall be subject to approval of the Engineer-In-Charge.
No block for the attachment of fixtures shall be embedded in the concrete unless approved by the
Engineer-In-Charge.
Where steel frames are used for openings they shall be rigid, preassembled and may with the Engineer-
In-Charges approval be welded to the reinforcement. Should climbing rods occur at any opening, a
temporary column" is to be provided to prevent buckling of the rod. The recessed construction joints for
any suspended floors shall be formed within the slide. The formwork shall be slightly less than the wall
thickness. For small openings wooden frame may be used.
7) CURING AND PROTECTION
Concrete is to be protected from cold or frost. Concrete shall not remain uncured for a period longer
than 12 hours. For temporary curing a skirting of wet hessian sheeting attached to the bottom of the
slide will be acceptable. This hessian shall be wetted at the bottom and shall be kept damp at all times.
The internal surface of the windshield should be left unfinished to allow proper inspection by the
Engineer-In-Charge. Thereafter the internal surface of the windshield shall be cured. The Contractor
shall submit details of his proposed method for curing the concrete surfaces of the windshield for
approval of the Engineer-In-Charge.
Monitoring of Slide Position
The Contractor shall measure at six hourly intervals the following dimensions and positions and shall
record these immediately in tabular form and on graphs:
a) Progress height.
b) Centre line in relation to the centres at the base.
c) Internal wall faces in relation to the concrete at the base.
d) Wall thickness.
e) Twist.
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The verticality of the structure shall be checked at first light every morning to minimize any differential
thermal effects and reported to the Engineer-In-Charge and additionally as required to ensure that all
the specified tolerance requirements are maintained. If strong winds are blowing, this measurement
may be postponed under the directions of the Engineer-In-Charge.
The Contractor shall submit to the Engineer-In-Charge for approval, details of the procedure which he
intends to follow for checking of verticality.
The levels and positions of pockets, rebates, openings, sleeves, etc. as cast is to be measured as the
slide proceeds and is to be recorded on a set of drawings.
Copies of these records shall be given to the Engineer-In-Charge.
COATING FOR SUBSURFACE CONCRETE WORK:
Protection of sub-structure concrete work in direct contact with soil shall be ensured by adopting the
following painting system:-
1. Concrete Penetrating Bipolar Corrosion Inhibitor.(CPCI)
2. Epoxide Rasin Based Paint(ERBP)
The CPCI shall be applied first on concrete surface by brush or spray as per manufacture’s
instruction. Subsequently, as per direction of Engineer in charge, the migration of inhibitor in to the
concrete shall be wiped with a cloth prior to 1st
coat of ERBP application. The properties of the
coated system shall conform to the various requirements of application ASTM standers viz. ASTM-D-
217-68, B-117, D-4541, D-2794, G95 etc.
The specification for the application of these systems are are as under:
Sub-structure coating –Concrete Penetrating Bipolar Corrosion in Inhibitor.
One coat of water based Concrete Penetrating Bipolar Corrosion in Inhibitor (CPCI) shall be applied
over the surface, inspective of grade of Concrete as per manufacture’s specification to inhibit the
corrosion process of embedded reinforcement bars. The CPCI shall be non-toxic with pH of minimum
9.5 and specific gravity 1.00 to 1.08. It shall be free from nitrite, chromates and phosphates and shall
be dosed as per manufacture instructions. It shall have minimum 1 to 2 years successful usage
history conforming to field validation and evaluation technique (ASTM G5-94, C-102-89, C-109-92, C-
876-91).
Epoxide Resin Based Paint to sub-structure Elements:
Two (2) coats of epoxide resin based anti-corrosive and Chemical resistance paint over a coat of CPCI
shall be applied as per manufacture instruction for protection of Concrete against carbonation and
chloride penetration in saline/marine environment. The primer coat shall be of gray colour and Top
coat shall be of black colour with DFT of 150-162.5 microns each, thus giving the total DFT of 300-325
microns. Before application of paint, the following shall be particularly checked for conformance to this
specification and recommendation of the paint manufacture.
a) Surface profile
b) Catalysis ratio for two component paints
c) Minimum and maximum top coating times.
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The painting to all architectural & civil works shall be applied to withstand the severe marine exposure
condition,
8) STAGING FOR SHELL CONSTRUCTION
Design and erection of staging shall conform to the requirements of all relevant IS Codes and National
safety standards/regulations.
Bidder, at his own cost, shall prepare a detailed construction scheme and submit the same for approval
of Owner/consultant. If called upon, he shall submit to the Owner/consultant detailed drawings with
supporting calculations showing all details of formwork, staging, scaffolding, member sizes, connection
details and other arrangements for staging and for the concreting work and submit the same for review.
Any suggestions/ comments on the scheme/details conveyed to the Bidder shall be carried out by the
Bidder at no extra cost. Scheme submitted for approval shall incorporate separate provision of material
hoists and a passenger hoist.
As the staging serves a dual purpose, viz., as an access tower and as a bearing structure to support
construction loads, it shall be designed for all possible loads that could be imposed on it such as self-
weight, weight of ladder and timber platforms at all levels, weight of men, weight of construction
materials and equipment, wind loads, seismic loads, etc.
Minimum live load on staging due to labour and personnel movement shall be considered at 300 kg/m2.
It may be taken as 150 kg/m2 when earthquake loads are also taken into account. No increase in
stresses shall be considered for wind and seismic conditions. Staging shall also be designed to support
load due the structural steel girders of roof and floor framing during their erection.
Staging materials shall conform to the requirement of IS 2062 and IS 1161.Design of the staging shall be
carried out as per IS 800 and IS 4014.Fabrication of the staging shall commence only after the design
drawings prepared by the Bidder is approved by Owner/consultant.
Special inspection hoist of approved make shall be provided by the Bidder for regular inspection,
checking of scaffolding members, joints, etc. Fortnightly detailed inspection record shall be maintained
by the Bidder and shall be produced to the Engineer-In-Charge whenever required for his verification.
Notwithstanding the approval from the Engineer-In-Charge, the Bidder will be solely responsible for the
safety, security and proper functioning of the staging and formwork.
9) SHELL CONSTRUCTION
Chimney shell shall be constructed normally by slip form technique. However, presence of large
openings, such as breech openings has posed problems in controlling verticality and twisting of the shell
in some projects, possibly due to the jack rods in the opening location not adequately supported during
slipping operation. Hence Owner/consultant at his discretion may permit construction of the bottom
portion of the shell by conventional curved shuttering only.
Conventional / Jump form shuttering may be permitted only up to a height of “W/2” above breach
opening where “W” is the width of breach opening. Above this level only slipforming will be permitted.
Where conventional/jumpform shuttering is adopted, minimum stripping time of formwork shall not be
less than 12 hours for sides of RCC shell. However, the stripping time to be adopted on the works shall
be subject to the Engineer-In-Charge's approval. The Bidder shall not be permitted any increase in
construction period if the stripping time for shell exceeds 12 hours. Bidder shall mobilise adequate
number of tower cranes to handle concrete and reinforcement during construction
In case the Bidder intends to use slip form construction from the bottom of the shell itself, a starter wall
of minimum 600mm high shall be constructed at the bottom using conventional curved shuttering with
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proper taper. The height of the starter wall shall be sufficient to ensure adequate overlapping for the
slip form shutters to ensure proper lateral support for the concrete being placed at the bottom most
portion of the slip form. Length of dowel bars from the foundation raft shall be suitably modified taking
into account height of the starter wall. Also to prevent buckling of jack rods at the opening locations,
sacrificial concrete columns shall be provided with temporary radial shutters around the jack rods to
offer sufficient lateral support. Width of such columns shall be the same as the shell thickness and
length shall be a minimum of 600 mm. These temporary concrete columns will be dismantled after the
concrete above opening to a height of half the width of opening is at least 14 days old.
10) SHUTTERING FORMS, YOKES, JACKS AND JACK RODS
Shuttering plates shall be smooth and thoroughly cleaned. They shall be formed of steel plates 4 to 6
mm thick. EN 8 grade of steel is recommended as it is more malleable. Surface of the plate on the
concreting sides shall be coated with epoxy or polymers to minimize adhesion
Height of each panel is normally between 1100 to 1250mm and length about 2000mm.
Plates shall be bent to suit curvature of chimney.
As the diameter of chimney reduces with height, the plates over lap one another at ends. Care shall be
taken to ensure that the over lapping of form panel is vertical and not inclined. For tapered chimney,
over lapping of shutters, needs careful attention, to prevent them being filled up with concrete slurry.
Generally shuttering panels are fixed in a slightly inclined position to make it, self cleaning. Also the
shutter shall have a slight rake in the top to prevent ‘step’ forming, in the case of sliding being stopped.
Walers stiffen the form panel and transfer the load to the yokes. They are of structural steel, strong
enough to bear the lateral pressure of wet concrete laid within the form panels. The walers will be
braced suitably
Form are supported on the yokes and shall be provided with a double screw system, which allows
control of wall thickness, through rotation and translation of the panels relative to the yokes
Yokes are structural steel members placed radially at regular intervals not exceeding 2000mm, and
connected to radial supporting beams of the slip form structure. Yokes are also used to fix both external
and internal hanging scaffolding frame.
Exact number and capacity of jacks as well as spacing of yoke frames are to be determined taking into
account various loadings including self weight of the system.
Jacking system based on which the entire slip form system works, consist of jacks, jack rods and a
hydraulic pump with necessary pipe connection. It is desirable that the capacity of the jacks be
restricted to 3T, 6T and 12T with jacking rods of 25 mm, 32 mm and 40 mm diameter respectively.
Where thickness of wind shield is more than 500mm it is recommended to provide two Jacks per slip
form yoke
At least 50% spare jacks and jacking rods shall be kept ready during the entire operations. It is also
obligatory to maintain spare hydraulic pump along with set of loose pipes, in perfect working condition
on top of the working platform.
11) REINFORCEMENT PLACEMENT
Horizontal reinforcement bars shall be provided on the external side of vertical reinforcement bars. The
horizontal bars shall be pre bent to the curvature of the wind shield. All precautions shall be taken while
placing and securing the circumferential reinforcement bars to prevent them from bulging and getting
displaced during concreting and to ensure that there is no reduction in concrete cover. Each bar need to
be introduced below the available space between each yoke and this will affect the speed for providing
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reinforcement. Horizontal reinforcement will be tied to vertical reinforcement by means of binding
wires.
Vertical reinforcement shall be kept vertical by providing suitable holders within the slip forming
system. Due to problem in handling at heights, the maximum length of vertical bars may be restricted to
6 meters. The bars at yoke locations shall be re arranged to clear the yoke. Vertical reinforcement
projecting above forms shall be suitably supported to prevent breaking of bond between the bars and
freshly placed concrete. It shall be ensured that not more than one third of the bars are spliced along
any plane of the shell. For bar diameter more than 20 mm, bar couplers shall be used at splicing
location. Lapping shall be done only for bars less than 20 mm in diameter.
12) PLACEMENT OF CONCRETE
Before slip form is erected above the chimney raft, shell to a height of about 600 mm shall be cast, as a
starter, using conventional curved shuttering. The height of the starter shall be sufficient to ensure,
adequate over lapping for the slip form shutters, to give proper support for the newly placed concrete.
Particular attention shall be given to concrete placement because of thin wall section and presence of
reinforcement in addition to local obstruction due to yokes. Under no circumstance shall the point of
discharge of concrete into the form be more than 1500 mm above the concrete surface on which the
new concrete is to be placed. If concrete is placed using elephant trunk, the diameter shall be 200 mm
minimum.
To achieve good bond between foundation and the first lift of shell concrete, or horizontal joint caused
by interruption, neat cement slurry shall be poured over the initial concrete.
The slump of concrete at placing location shall be at least 150 mm.
Concrete shall be placed in about 200 mm thick layers uniformly in one continuous pour for the full
circumference of the shell, so that, there will be no vertical or inclined construction joint.
Pour sequence shall be such, that the next layer of concrete is placed, over the layer already placed,
well within initial setting time of the earlier pour. Concrete shall normally be placed within 90 minutes
of batching. Special care shall be taken to avoid displacement of reinforcement, openings, cut outs,
insert plates etc.
Vibrator used shall have a minimum frequency of 8000 RPM. Diameter of the needle shall normally be
about 60 mm, and in areas where reinforcement is congested, the needle could be of 40 mm diameter.
Vibrator shall be inserted in a vertical position at approximately 450 mm centres. Vibrator needle shall
be lowered unto concrete, only to depth corresponding to the thickness of poured concrete layer just
poured. Special care shall be taken while vibrating near openings, pockets etc. Where there is
congestion of reinforcement. During the first pour, when the forms are empty vibration should be
avoided or carried out into almost caution in order to avoid bending of yoke. Vibrator should not touch
shutters or embedment. At least two standby vibrators shall always be maintained on the top deck, all
the time during the entire period of slip forming.
It is recommended that membrane curing compound of approved make shall be sprayed on to the fresh
concrete surfaces emerging out of slip form shutters, to ensure proper curing at greater heights in line
with provisions of ACI – 307. The Curing Compound shall comply with ASTM C 309 and shall be applied
in strict conformity with the manufacturer’s recommendation. If the OWNER/CONSULTANTS approves
water spray may be used at lower heights. In that case elaborate spraying arrangement shall be made
both on inside and outside surfaces with necessary pipes and pumps of adequate head, along with
standby. The spraying shall be continued for 14 days. The sprayers shall be hung below the bottom of
the slip form and raised along with it.
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13) USE OF SLIPFORM SHUTTERING
The Bidder shall provide all necessary temporary lighting, stand by equipments for mixing, hoisting,
placing and vibrating of concrete, and also ensure that all materials for the slide are stockpiled on site in
sufficient quantities to facilitate uninterrupted sliding. While sliding, the Bidder shall take all necessary
steps to ensure the slide proceeds in continuous operation, stopping only for planned interruption as
approved by Owner/consultant. The Bidder shall give the Owner/consultant notice of 48 hours before
slipping commences to enable him to examine and satisfy himself, regarding the arrangement at site, to
proceed with uninterrupted slipping operation generally satisfying the procedure as per the method
statement prepared by the Bidder and approved by Owner/consultant.
It is desirable to have a break at least for one day for every two weeks of continuous slipping. Such
breaks shall be used for various maintenance activities. It is preferable to suspend sliding operation
during cyclonic weather.
No block for attachment of fixtures shall be embedded to the concrete unless approved by
Owner/consultant. Small openings and pockets less than 600x300mm can be formed by inserting
wooden blocks / frame.
Larger openings shall be formed using frames which shall be formed well in advance of slipping. All the
frames, etc shall be 15 mm narrower than the nominal wall thickness to allow for wall taper. The
recessed construction joints with forms, if any, for any suspended floor is provided within the slip form;
such forms shall have a clearance of minimum 15 mm from the sliding shutter on each face.
14) DESIGN OF SHUTTERING
The CONTRACTOR shall give the criteria to be adopted for design of various temporary works and the
slipform. The following requirements shall be met.
a) Staging materials shall conform to IS: 2062.
b) Minimum design live load from personnel shall be 350 kg/sq. m. To this shall be added the self-
weight and weight of construction materials and equipment, etc.
c) The staging shall be designed as per the requirements of IS:800 (for conventional type) and
IS:4014 (for tubular scaffolding type).
d) The CONTRACTOR's design calculations shall be based on normally accepted calculation
techniques for the structural forms which the CONTRACTOR adopts for staging.
It shall be ensured by the Contractor that during all stages of execution of work, the cement slurry
mortar, concrete etc. deposited on the platform and scaffold are effectively removed periodically
A water level system, together with plumb-bobs shall be established for ensuring true vertically of the
shell. The slipform shutter shall have independent controls to counteract any tendency of the structure
to travel out of plumb or to slew, twist, rock or float.
The shutter structure shall have a minimum grip length of 1000mm. A sliding shutter shall have a slight
rake in the top to prevent "steps" forming in the event of the slide being stopped.
In the slip form shutter the details of the position and arrangement of jack rods shall be submitted to
the Engineer-In-Charge for approval. Double jack rods will be permitted and jack rod steel, may be
removed from the slide. Jack rods will be 25mm or greater in diameter. Voids left by the removal of jack
rods in the shell must be grouted up.
The Contractor shall make suitable arrangement for continuous reading, on position of shell to be
determined. This shall relate directly to the centre of the structures at their bases and shall enable the
degree of twist and inner and outer wall positions to be determined. An accurate height measure shall
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be installed. Prior to commencing construction, the Contractor's proposed arrangement of this must be
approved by the Engineer-In-Charge.
2.10 REINFORCEMENT
The Reinforcement bars of Grade Fe. 500 conforming to IS: 1786, having Highly Corrosion resistant
elements not less than 0.5% shall be used for all the works. As per clause 1.6 of 1786- 2008, deformed
bars produced by rerolling finished products such as plates and rails, (virgin or used or scrap) or by
rolling materials for which the metallurgical history is not fully documented or not known are not
acceptable.
All reinforcement shall be clean and free from pitting, loose mill scales, dust, loose rust and coats of
paints, oil or other coatings which may destroy or reduce bond. All such mill scales, rust, paint and other
coatings shall be removed by the contractor before use.
1) WELDING OF JOINTS
Welding of joints in reinforcement for bars of 28mm dia. and below shall not be allowed. However, in
case of using welded joints for bars 32mm and above, the approval of the Engineer-In-Charge shall be
obtained. The Engineer-In-Charge may require the contractor, prior to the use of welded joints, to have
tests carried out at the contractor's expense to prove that the joints are of the full strength of the bars
connected. The welding of reinforcement shall be done in accordance with the recommendations of IS:
2751 Code of Practice for welding of Mild Steel Bars used for Reinforced concrete construction. Special
precautions are required in the welding of cold worked reinforcing bars.
Tack welding may be permitted by the Engineer-In-Charge under certain conditions for fixing
reinforcement.
Welding shall be done by skilled welders only. Suitable safeguards shall be taken by the contractor for
welding.
2) WORKMANSHIP
General construction details and workmanship related to reinforcement including bar bends, lap splices
and installation shall be in accordance with IS: 2502-Code of Practice for bending and fixing, of bars for
concrete 'reinforcement-as well as the detailing of reinforcement given in IS: 456.
All bars shall be bent as per the bar bending Schedules indicated in the drawing or supplied separately
relevant to the particular drawing. The contractor shall in all cases verify for himself the correctness of
the schedules giving the numbers, length and the bending details of the bars,
Hot bending of bars shall not be allowed.
The number, sizes, shape and position of all the reinforcement shall, unless, otherwise directed or
authorized by the Engineer-In-Charge, be strictly in accordance with the drawings. The reinforcement
shall be adequately secured and held in position by chairs and spacers. Ties at intersections shall be
made with 16 SWG soft black annealed binding wire. Wherever conduit, piping inserts, sleeves, etc.,
interfere with placing of reinforcement proper adjustment in the spacing of bars shall be made as
approved by the Engineer-In-Charge.
Splices in reinforcement shall be made and located only as called for on the drawings or as otherwise
approved by the Engineer-In-Charge.
The contractor must obtain the approval of the Engineer-In-Charge for the reinforcement placed before
any concrete is placed in the forms.
Concrete spacer blocks of same strength as parent concrete shall be used to ensure correct cover to the
reinforcement. The clear cover shall be as shown on the drawings or as per instructions of the Engineer-
In-Charge.
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All the reinforcement bars shall be so tied as to form a rigid cage to prevent displacement before or
during concreting. Necessary wooden planks supported independently of the reinforcement shall be
provided for the labour to move.
The vertical distances required between successive layers of bars in beams or similar members shall be
maintained by the provision of mild steel spacer bars inserted at such interval that the main bars do not
perceptibly sag between adjacent spacer bars.
The reinforcement bending shall be carried out as per the approved bar bending schedule prepared
based on design drawing and availability of reinforcing bar in market. Workmanship shall conform to IS:
2502. All reinforcement shall be free from loose mill scale, rust, oil, grease and paint. Reinforcement
shall not be bent or straightened in a manner that will injure the materials and all bars shall preferably
be bent cold.
All reinforcement shall be accurately fixed by approved means and maintained in correct position as
shown in the drawings by use of blocks, spacers and chairs as per IS 2502 to prevent displacement
during placing and compaction of concrete.
No metal part of any device shall be used for connecting bars or for maintaining reinforcement in the
correct position within the specified minimum concrete cover to the reinforcement.
Projecting reinforcement or dowel bars for future connection of the structural works shall be protected
by cement paint, if they are to be left exposed for a long time
Reinforcement detailing shall be as per IS 13920, SP 34.
Two layers of reinforcement (on both inner and outer faces) shall be provided for RCC wall sections
having thickness 150 mm or more.
2.11 STRUCTURAL STEEL AND METAL WORK
1) GENERAL
All workmanship shall be of best practice in modern structural shops, and shall conform to the
provisions of the IS: 800 and other relevant IS Specifications, unless otherwise specified. Erection of
structural steel work shall be done as per requirement of IS: 800.
2) FLUE DUCT
The bidder has to design, and install flue gas duct from the Terminal Point (TP) of the boiler vendor
outside the chimney to the flue inside the chimney. The duct will be of rectangular or square section
matching the duct supplied by the boiler vendor
The duct will be provided with structural steel supporting arrangement from the chimney raft. All these
supports shall be through bearings which will prevent transfer of heat to the support structure and at
the same time permit thermal movement of the duct. The flange provided at the terminal point shall
have bolt holes matching with the requirement of BTG vendor. The joint shall be made leak proof with
appropriate gaskets.
The duct work and its supporting structures shall be designed for the most adverse of possible load
combinations of gravity loading, ash accumulation, wind loading, seismic loading, flue gas pressure
loading and thermal loading along with loading due to insulation and live load of 500kg per square
meter at top. Suitable structure/bracing arrangement shall be provided inside the duct to maintain the
correct cross section at all junction points.
The duct shall be fabricated out of structural steel of grade E250 (410W) quality B (killed). Minimum
thickness of plates shall be 8mm.
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3) FABRICATION YARD
The CONTRACTOR shall establish a full-fledged fabrication shop at site including proper cutting,
bending, welding, testing and proper handling facilities. Complete fabrication shall be carried out at site.
4) CAST IRON CAP/SS/GI
The Cast Iron cap, fitted at the top of the chimney, shall be of thickness not less than 12 mm. This shall
preferably be a single cap covering both the concrete shell and the lining, with the segments bolted
together securely and properly anchored inside the concrete in such a manner as to form a complete
annular unit, allowing for unequal circumferential and vertical expansion and contraction of concrete
shell and lining and for deflection of shaft due to wind.
All bolts, nuts, washers, rag bolts and other fasteners as required for fixing cast iron cap shall be of
bronze material. Gaps between segments are to be filled with asbestos mill-board or fibre-glass packing.
Casting is to be assembled to match with the dimensions specified in drawings, before despatch to site.
C.I caps to be painted with two coats of Acid Resisting Paints over primer coats as recommended by
paint manufacturer.
5) STEEL EMBEDMENTS
All embedments shall be accurately set, rigidly fastened and suitably anchored by welding lugs. Anchor
bolts shall be set to template and firmly secured in vertical and horizontal line and required positions.
Exposed surfaces of embedded materials are to be painted with one coat of red oxide zinc chrome and/
or bituminous paint. Correct location and alignment as per drawings/instruction of all anchor bolts,
anchor sleeves, inserts, hangers, conduit pipes and other embedded fixtures shall be entirely the
responsibility of the Contractor.
6) PIPE JOINTS
All joints between pipes, pipes and fittings and manholes shall be gas-tight when above ground and
water tight when underground. Method of pipe cutting and jointing shall be as per instruction of the
pipe and fittings manufacturer or as approved by the Engineer-In-Charge.
7) TOLERANCES
The erection shall be carried out to the requirements stated in Section 7 (h) of AISC Code Standard
practice, except that Structural Steel members be erected plumb with a tolerance not exceeding 1 in
1000. Column splices and other compression joints which depend upon contact bearing, upon
completion, shall bear with respect to the centroid of the contact area.
At least 65% of the entire contact area shall be in full bearing and the separation of any remaining
portion shall not exceed 0.5 mm except locally at toes of flanges where a 50% greater separation is
permissible. Otherwise corrective measures as specified by the GEB/engineer-in-charge shall be taken.
8) CONNECTIONS
a) H.S.F.G. Bolts:
The Contractor shall obtain the prior written approval of the engineer for the method proposed to be
adopted for tightening the High Strength Friction Grip bolts. For preliminary assembly and before use of
these bolts he shall use his own erection bolts.
b) Bolting/Riveting
In general bolts and rivets will conform to the relevant Indian Standards. The methods of establishing
connections, use of equipment, etc., shall be as approved by the GEB/Engineer-in-charge.
c) Welding
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Welding where specified shall be performed by the shielded electric arc, gas or other approved
methods, using coated electrodes and/or low hydrogen electrode conforming to 1S:814. The welding
process and the qualification of the welding operators shall conform to IS:817 and IS:823(1964) and
shall be got approved before commencement of any work of welding.
All field assembly and welding shall be executed in accordance with the requirements for shop
fabrications excepting which manifestly apply to shop conditions only. Where the steel has been
delivered, painted, the paint shall be removed before field welding for a distance of at least 50 mm on
either side of the joints. All welds should be free from defects like blow holes, lack of penetration, slag
intrusion etc. All welds shall be cleaned of slab or flux and shall show uniform smoothness of weld
metal, feather edges without overlap and free from porosity. Where a thick weld is required the weld
metal shall be deposited in successive layers. Each layer except the last, shall be preened moderately
before the next layer is applied. The contractor shall be responsible for the quality of the work
performed by his welding group.
If required, the engineer may test the welds by non-destructive tests. Any defective welds shall be made
good by the Contractor at no extra cost and the cost of non-destructive testing for such defective welds
shall be borne by the Contractor.
d) Specification for Pin and Pinned connections
Pin Material:
Rolled steel pins and rollers, including those made from slabs shall comply with the requirements of IS:
2062 - Specification for steel for general structural purposes (fusion welding quality) or IS: 8500.
Forged steel pins shall have a tensile strength of 44 to 50 kg/Sq. mm. or 57 to 63 kg/sq. mm. to conform
to IS:1875 - Specification for carbon steel billets, blooms and slabs for forgings. Steel casting for cast
steel pins shall conform to grade 1 or 3 of IS: 1030.
Pin Holes:
Pin holes shall be bored true to gauge, smooth, straight, at right angle with the axis of the member and
parallel with each other unless otherwise required. In built up members the boring shall be done after
the members have been welded. The specified diameter of pin shall be its minimum diameter. Hole
diameter can be maximum 0.5 mm more than the pin diameter.
Pins:
The pins shall be parallel throughout and shall have a smooth surface free from flaws. At ends of pins
there shall be taper to facilitate in driving the pin. Pins more than 175 mm in length of diameter shall be
forged and annealed. Cotter pins shall be provided on both sides of the pin.
2.12 CONSTRUCTION TOOLS AND MATERIALS
Bidder shall provide and maintain at the site necessary number and type of machinery and equipment
including survey instruments in good working condition for proper setting out and timely completion of
the works covered under this specification. All arrangements for transporting the equipment to and
from the site shall be done by the Bidder at his own expense.
It shall be ensured by the Bidder that work shall proceed uninterrupted even in the event of power
failures. As such, adequate number of diesel generator sets and diesel operated equipment (such as
concrete mixers, vibrators, etc.) shall be provided by the Bidder, as an alternative arrangement.
Bidder shall provide all fuels and lubricants required for the operation and maintenance of construction
machinery and equipment as well as for his transport vehicles.
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Bidder shall, at his cost, arrange for all his requirements of materials such as, but not limited to, oxygen,
acetylene, welding electrodes, ropes, form ties, turn-buckles, clamps, wiping rags, sand paper, etc.,
which are required to satisfactorily perform his work.
2.13 PAINTING
All paints shall be of make and shade as instructed and approved by the Engineer-In-Charge. Necessary
test certificates, manufacturer's literature and samples shall be submitted to the Engineer-In-Charge, for
his approval, before bulk purchase is made.
1) CONCRETE SURFACE
Painting shall be as per Technical Specifications. Care shall be taken that the surface is free from stain
honeycomb and any rough and uneven surface. The joints between two shuttering and two lifts of
shuttering shall so be prepared that any unevenness, if by chance exists shall be removed. If one coat of
paint is not sufficient to give the required finish the contractor, at his own cost, shall repaint the surface
until the Engineer-In-Charge is satisfied with the workmanship.
External painting shall commence immediately after the shell construction is completed and the
concrete is well cured. The painting shall preferably be started from the top. This is to ensure visibility of
stack to low flying aircraft at day time even during the period of construction of the internals of the
chimney.
2) METAL SURFACE
All welded joints with galvanized steel shall be provided with cold galvanizing paint. Other accessories
necessary for lightning protection as well as brackets, supports and other items of obstruction lighting
installations, shall be painted with two coats of Red Oxide priming paint and one coat of Aluminium
finishing paint. The Red Oxide paint shall be applied on the down conductors and bands before
installation and the Aluminium paint coating shall be applied after the installation is over. The copper air
terminals, conductors, fasteners and other accessories upto the top encircling band shall have a
continuous lead covering of about 2 mm. thickness, for protection against corrosion due to gases and
weather.
3) BITUMINOUS OR TAR COATING
The surface to be waterproofed shall be rendered absolutely dry, clean and dust free. The surface shall
be sand papered, cleaned and completely coated with hot coal tar paint of approved manufacture and
quality as per IS: 216 (not heated above 375oF) using not less than 2 kg. per Sq m. or with hot asphalt
i.e. bitumen according to IS: 73 (not heated above 400oF) using not less than 1.5 kg per Sq m. When the
first coat has completely dried up and approved by the Engineer-In-Charge, the second coat shall be
applied in the same manner using not less than 1.25 Kg. per Sq m. in case of coal tar and 1 kg per Sq m.
in case of asphalt.
Immediately after application of the second coat and before it is dried up, sand shall be spread on the
surface to cover it completely. Sufficient time shall be allowed after spreading of sand before backfilling
is done in order to allow the final coat to dry up completely.
4) ACID AND HEAT RESISTANT PAINT
The quality and type of the paint shall have the prior approval of the Engineer-In-Charge. For this, a
small area shall be painted and a sample of paint shall be shown to the Engineer-In-Charge. The surface
to be painted shall be prepared and primary coat, if required as per the paint manufacturer's
specification and direction of the Engineer-In-Charge, shall be applied. The paint shall conform, unless
otherwise stated, to the requirement of IS: 158. Necessary samples, test certificates and manufacturer's
literature shall be submitted to the Engineer-In-Charge for his approval. The surface to be painted shall
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be completely dry before the paint is applied and the drying time between consecutive coats shall not
be less than 5 hours. The overall combined thickness of paint shall be a minimum of 230 microns.
2.14 GALVANIZING
All steel including threaded bolts, nuts and washers, unless specified otherwise in contract, shall be hot
dip galvanized in accordance with IS Specification or American Society for Testing and Material
Specification ASTM 123.
All members to be galvanized shall be cleaned thoroughly, to the satisfaction of the Engineer-In-Charge,
by the process of pickling. Pickling shall be carried out in an acid bath containing sulphuric or
hydrochloric acid of suitable and adjusted concentration and temperature. Pickling process shall be
completed by rinsing the members thoroughly in warm water.
Galvanizing shall be carried out by hot dip process in a proper and uniformly heated bath and it shall
meet all the requirements when tested in accordance with IS: 2633. The zinc coating shall be of uniform
thickness with an acceptable minimum value of 610 gms/m2 for structural steel. If the galvanizing of
any member is damaged, the Engineer-In-Charge shall be shown of the extent of damage and if so
directed, the galvanizing may have to be redone in the similar manner stated above.
2.15 EXPANSION & ISOLATION JOINTS
1) GENERAL
Expansion and isolation joints in concrete structures shall be provided at specified places, as per details
indicated on the drawings. The materials and types of joints shall be as specified hereinafter. In case of
liquid retaining structures, additional precautions shall be taken to prevent leakage of liquids as may be
specified on the drawings or as directed by the Engineer-In-Charge. All materials are to be procured
from reliable manufacturers and must have the approval of the Engineer-In-Charge. Where it is the
responsibility of the Contractor to supply the material, the Engineer-In-Charge may demand test
certificates for the materials and/or instruct the Contractor to get them tested in an approved
laboratory free of cost to the Owner. Approved samples of the material to be incorporated in the works
shall be with the Engineer-In-Charge. Joints shall be formed true to line, level, shape, dimension and
quality as per drawings and specifications. Prior approval of the method of forming the joints should be
obtained from the Engineer-In-Charge before starting the work.
2) BITUMEN BOARD/EXPANDED POLYSTYRENE BOARD BITUMEN BOARD
Bitumen impregnated fibre board of approved manufacturer as per IS: 1838 may be used as fillers for
expansion joints. It must be durable and water proof. It shall be compressible and possess a high degree
of rebound. The dimensions of the board should be equal to that of the joint being formed. It should,
preferably be manufactured in one piece, matching the dimension of the joint and not prepared by
cutting to size smaller pieces from larger boards at site. At the exposed end, the joint shall be sealed
with approved sealing compound to a depth of at least 25 mm after application of an approved primer.
The sealing compound and the primer shall be applied as specified by the manufacturer.
3) FIXING OF JOINT FILLER
The concrete surface shall be made clean, smooth and free from dirt or loose particles. When the
surface is completely dry, a coat of hot blow bitumen conforming to IS: 702 of grade 85/25 shall be
given with brush or spray. When the bitumen is still hot the pre-moulded joint filler fibre board shall be
pressed against the surface and held in position till the time it takes to adhere. When more than one
layer of filler is specified each layer shall be made to adhere to the preceding layer with a few patches of
bitumen between the two layers. After placing the filler in position, the surface of the filler against
which further concreting is to be done is given a coat of bitumen.
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a) Filling of joint sealing compound
Sealing compound shall be of Grade A conforming to IS: 1834. Bitumen shall conform to IS: 3384. Before
application of the sealing compound the sides of the joint are sprayed or brushed with bitumen primer.
The primer is then allowed to dry out thoroughly for at least 24 hours and then filled with a mix of 30 %
fine sand and 70 % sealing compound by weight.
b) Expanded Polystyrene Boards
If required, commercial quality of expanded polystyrene products commonly used for thermal
insulations may also be used as filler material in expansion joints. The thickness may vary from 12 mm
to 50 mm. The material will have to be procured from reliable manufacturers as approved by the
Engineer-In-Charge. The method of installations will be similar to that recommended by the
manufacturers for fixing on cold storage walls. A coat of bitumen paint may have to be applied on the
board against which concrete will be placed.
4) JOINT SEALING STRIPS
Joint sealing strips may be provided at the construction, expansion and isolation joints as a continuous
diaphragm to contain the filler material and/or to exclude passage of water or any other material into or
out of the structure. The sealing strips will be either metallic like G.I., Aluminium or copper, of non-
metallic like rubber or P.V.C.
Sealing strips will not have any longitudinal joint and will be procured and installed in largest practicable
lengths having a minimum number of transverse joints. The material is to be procured from reputed
manufacturers having proven records of satisfactory supply of joint strips of similar make and shape for
the jobs. The jointing procedure shall be as per the manufacturer's recommendations, revised if
necessary, by the Engineer-In-Charge. The Contractor is to supply all labour and material for installation
including the material and tools required for jointing, testing, protection, etc. If desired by the Engineer-
In-Charge, joints in rubber seals may have to be vulcanized. Metal Sealing Strips shall be either G.I.,
Aluminium or Copper and formed straight, U shaped, z shaped or any other shape and of thickness as
indicated in the drawing and Schedule of Items and/ or as instructed by the Engineer-In-Charge.
The transverse joints will be gas welded using brass rods and approved flux and will be tested by an
approved method to establish that it is leak proof. In case it is found that the joints cannot be made leak
proof, longer lap length and different method of brazing which will render it leak proof, will be adopted
by the Contractor without any additional cost to the Owner. The edges shall be neatly crimped and bent
to ensure proper bond with the concrete.
a) G.I. Strips:
G.I Strips shall be minimum 1.5 mm thick and 150 mm in width unless specified otherwise. The standard
of Galvanizing shall be as per relevant Indian Standards for heavy duty work. The strips shall be strong,
durable, without any rust or crease. At the joints, the overlapping should be for a minimum length of 50
mm.
b) Aluminium Strips:
Aluminium strips shall be minimum 18 swg. thick and 300 mm wide unless specified other wise and shall
conform to IS: 737 of 19000 grade or 31000 grade (Designation as per IS:6051). A minimum lap of 50
mm length is required at the joints.
c) Copper Strips:
The Copper strips shall be minimum 18 swg. In thickness and 300 mm width unless specified otherwise
and shall conform to the relevant Indian Standards. It should be cleaned thoroughly before use to
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expose fresh surface, without any reduction in gauge. A minimum lap of 50 mm length is required at the
joints.
d) Non-metallic Sealing Strips
These will be normally in Rubber or P.V.C. joint seals can be of shape having any combination of the
following features:
a) Plain
b) Central bulb
c) Dumb-bell or flattened ends
d) Ribbed and Corrugated Wings
e) V-shaped
As these types of seals can be easily handled in very large lengths unlike metal strips, transverse joints
will be allowed only under unavoidable circumstances and without the specific approval of the
Engineer-In-Charge. The method of forming these joints, laps etc. shall be specified by the Manufacturer
and/or as approved by the Engineer-In-Charge taking particular care to match the central bulbs and the
edges accurately.
e) Rubber Sealing Strips:
The minimum thickness of rubber sealing strips shall be 3 mm and the minimum width 100 mm. The
actual size and shape will be as shown in drawings/Schedule of Items and/or as directed by the
Engineer-In-Charge. The material will be natural rubber and thus resistant to corrosion, abrasion and
tear and also to attacks from the acids, alkalis and chemicals normally encountered in service.
f) P.V.C. Sealing Strips
The minimum thickness of P.V.C sealing strips will be 3 mm and the minimum width 100 mm. The actual
size and shape will be as shown in drawings/Schedule of Items and/or as directed by the Engineer-In-
Charge. The material should be of good quality Polyvinyl Chloride highly resistant to tearing, abrasion
and corrosion as well as to chemicals likely to come in contact with during use.
5) BITUMEN COMPOUND
When directed, the gap in expansion joints shall be thoroughly cleaned and bitumen compound laid as
per manufacturer's specifications. The compound to be used shall be of approved manufacturer and
shall conform to the requirements of IS: 1834.
6) ISOLATION JOINTS
Strong and tough alkathene sheet or equivalent, about 1 mm in thickness and as approved by the
Engineer-In-Charge shall be used in Isolation Joints. It shall be fixed by an approved adhesive compound
on the cleaned surface on the already set concrete, to cover it fully. Fresh concrete shall be laid against
the sheet, care being taken not to damage the sheet in any way.
7) RUBBER PAD
Hard foundation quality rubber pads of required thickness and shapes be put below machine or other
foundation as shown on the drawing or as directed by the Engineer-In-Charge. The rubber shall have a
unit weight of 930 Kg/m3, shore hardness – 65A to 70A and be of best quality of approved manufacture,
durable, capable of absorbing vibration and must be chemically inert when contact with moist or dry
earth or any other deleterious material expected under normal conditions.
2.16 PRECAST CONCRETE
All precast work shall be carried out in a yard for the purpose. This yard shall be dry, properly leveled
and having a hard and even surface. If the ground is to be used as a layer of cement plaster with smooth
neat cement finish or a layer of M.S. sheeting. Where directed by the Engineer-In-Charge, casting will
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have to be done on suitable vibrating table. The yard, lifting equipment, curing tank, finished material
storage space etc. shall be designed such that the units are not lifted from the mould before seven (7)
days of curing and can be removed for erection after twenty eight (28) days of curing. The moulds shall
preferably be of steel or of timber lined with G.I. sheet metal. The yard shall preferably be fenced.
Lifting hooks, where necessary or as directed by the Engineer-In-Charge, shall be embedded in correct
position of the units to facilitate erection, even though they may not be shown on the drawings, and
shall be removed and the hooks finished after erection if directed by the Engineer-In-Charge.
Precast concrete units, when ready, shall be transported to site by suitable means approved by the
Engineer-In-Charge. Care shall be taken to ensure that no damage occurs during transportation. All
adjustments, levelling and plumbing shall be done as per instructions of the Engineer-In-Charge. The
Contractor shall render all help with instruments, materials and men to the Engineer-In-Charge for
checking the proper erection of the precast units. Chipped or cracked or otherwise damaged pre-cast
elements will be rejected.
After erection and alignment, the joints shall be filled with grout or concrete as directed by the
Engineer-In-Charge. If centerings have to be used for supporting the precast units, they shall not be
removed until the joints have attained sufficient strength and in no case before fourteen (14) days. The
joint between precast roof planks shall be pointed with 1:2 cement: sand mortar where called for in the
drawings.
2.17 GROUTING
Non-shrink flowable grout shall be used for under pinning work below base plate of columns. Non-
shrink cum plasticiser admixture shall be added in the grout.
Type and grade of grouting shall be indicated. Crushing strength of the grout shall generally be one
grade higher than the base concrete. Minimum grade of grout shall be M30.
2.18 INSULATION AND PACKING
All packing and insulation material shall be of thickness, diameter and type, shown in the drawing. The
packing and insulating material shall be made of asbestos rope, vermiculite concrete, slag or mineral
wool and asbestos mill-boards.
1) ASBESTOS ROPE
The diameter of the rope shall be as per drawing. The material shall be of best quality available in the
market and shall be purchased after a sample is approved by the Engineer-In-Charge. The rope shall be
plain, Grade-I, conforming to IS: 4687-1968. The strand shall be long, well twisted and no torn thread
shall stick out. The rope shall be firmly packed so as to prevent gas leakage.
2) SLAG OR MINERAL WOOL
The thickness of packed slag wool shall be as shown in the drawing. IS: 3677 for Rock and Slag wool
mats for thermal insulation may be referred for guidance. The co-efficient of thermal conductivity and
packed density shall be tested according to IS: 3677 and IS: 3346.
3) VERMICULITE CONCRETE
Vermiculite concrete shall be made by mixing exfoliated vermiculite, portland cement and water. It shall
be of Grade-B, having a density of 210 Kg./m3. The vermiculite aggregate size shall be maximum 6 mm.
The mix shall be 1 cement and 8 vermiculite by volume.
4) ASBESTOS MILL BOARD
Asbestos mill board shall be of thickness as indicated in drawing. It shall be of best quality of standard
make available in the market and samples shall be submitted to the Engineer-In-Charge for approval. It
shall be plain, dense and homogeneous texture, without cracks, flaw and any other manufacturing
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defect. It shall be laid directly onto the concrete bed after removing any loose material or any
aggregate. The concrete shall be prepared without mortar so that the board can have a good seating.
2.19 LIGHTNING PROTECTION SYSTEM
1) GENERAL
The lightning protection system to be installed on the chimney shall satisfy the following requirements.
2) AIR TERMINALS
The Chimney shall be provided with pointed air terminals uniformly distributed along the top rim of the
chimney. The projected length of the air terminals above the top of the chimney shall not be less than
1000 mm. The air terminals shall be made of lead coated solid copper rods having a minimum diameter
of 20 mm. The air terminals shall be secured to the top of chimney by at least two fasteners of
substantial construction to withstand high wind pressure acting in the area commensurate with the
height involved. All the air terminals shall be electrically connected together by means of a band of 75 x
6 mm galvanized steel flat, which shall form a close loop 600 mm. below the top of the chimney. Each
segment for the cast iron cap of the chimney shall be connected to this galvanized steel flat band by
means of tightly bolted connections.
3) DOWN CONDUCTORS
Two numbers of vertical down conductors of 50 x 6 mm. galvanized steel flats shall be provided, spaced
as shown in drawings. The down conductors shall start from the top encircling band, leading to the
ground. Galvanized steel 50 x 6 mm. flat bands shall be provided below each balcony. Encircling band,
below each balcony, shall be electrically connected to each down conductor. The connections of the
galvanized steel down conductors to the copper air terminals shall be brazed and connection to the
nearest grounding grid at the bottom shall be arc welded. Connection between any two galvanized steel
flats/bands shall be made by arc welding.
The galvanized steel flat encircling bands shall be supported at an interval of maximum 600 mm. and
the vertical down conductors shall be supported at an interval of approx. 2500 mm. The fasteners shall
be of same grade of material as the conductors and have to be galvanized. The conductor shall be laid
straight and sharp bends shall be avoided as far as practicable. A suitable bolted test piece shall be
provided at each down conductor at a convenient height near the bottom of the chimney.
At All supports, the portion embedded inside the chimney shell concrete shall not touch the
reinforcement bars and shall be duly insulated from them.
4) BONDING
All exposed metallic parts of the chimney shall be bonded to the down conductors. Such parts shall
include ladders, balconies, conduits, etc. If the metal has considerable length, it shall be bonded at each
end. If the metallic components are composed of electrically discontinuous parts, each part shall be
bonded to the down conductors. The bond shall have a minimum cross sectional area equal to that of
the down conductor.
5) JOINTS
The joints in the lightning conductors shall be kept to a minimum and there shall be no joint in the
underground portions of conductors. All joints, except those for the air terminals, shall be done by arc
welding process. Overlapping of the conductors at straight joints shall not be less than 150 mm. The
bolted joint of the test piece shall be covered with thick coating of bituminous paint after successful
testing. The connections between the M.S. down conductors/short piece (of 50 x 6 mm. galvanized steel
flat) and the copper air terminals shall be brass brazed as shown in the drawing (with the help of brass
rods, manufactured by Indian Oxygen Limited (Silos or Ruptum 14) or equivalent.
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2.20 AVIATION OBSTRUCTION LIGHTING SYSTEM
1) LIGHTING SYSTEM
The Contractor shall supply and install the aviation obstruction Lighting system as given below on the
chimney:
a) 4 sets of single obstruction lights with fixtures at platform levels.
b) Complete C.I. conduits, PVC insulated wires, G.I. grounding conductor, weatherproof outdoor
junction box and all accessories viz. supports, clamps, junction boxes, etc. to make the installation
complete in all respects. Conduit wiring shall be from the lighting fixtures to the junction box located at
the bottom of the chimney.
2) LIGHTING FIXTURES
The lighting fixtures shall be suitable for 240 V + 10%, 50 Hz + 5%, single phase, A.C. supply. All fixtures
and accessories shall be weatherproof, outdoor type, capable of withstanding highly humid and flue-
laden atmosphere. The obstruction lighting fixtures shall be LED based of medium intensity and
complete with all necessary accessories. A set of four nos. single lights shall be installed on each
platforms at 90o apart with suitable supporting arrangement to withstand high wind pressure. The
number of fixtures and the levels on which the fixtures shall be placed shall be decided based on ICAO
regulation.
3) CONDUIT WIRING
All the obstruction lights shall be uniformly distributed over three single-phase circuits. Conduit wiring
for lighting installation shall be done with PVC cables drawn through the G.I. conduit of proper size. The
GI conduits shall be terminated to a fuse box mounted on the chimney shell, at an accessible height
from the ground. The cables shall be 1100/650 V Grade, 1/c, 10mm2, PVC insulated and sheathed
Stranded Aluminium conductor. The conduits shall be clamped at interval not greater than 600 mm. by
means of approved type of saddles, clamps, etc. securely fixed on the shell/ladder. PVC bush shall be
used at either end of the conduit. The minimum size of conduit to be used for the installations shall be
65 mm. Pull boxes, at intervals of not more than 10 meters, inspection bends, etc. are to be provided at
suitable locations to facilitate laying of wires. 8 SWG G.I. wire shall be run along the conduit for
grounding purpose. All conduit accessories and junction boxes shall be hot-dip galvanized and of
approved type. Wiring shall be done as per the relevant IS. Specification.
4) JUNCTION BOX
The junction box at the chimney bottom shall be weatherproof and suitable for flue laden atmosphere
and provided with suitable terminal blocks and conduit knockouts for incoming and outgoing conduits.
4-core PVC insulated cable with Aluminium Conductor will be used to feed power supply to the bottom
most junction box which shall have suitable double compression type cable gland for erection and
installation of cables.
5) CONTROL PANEL
There will be two incomers – one main incomer and one stand-by. Automatic changeover facility with
manual option shall be provided in case of failure of main incomer. Stand by incomer will be
disconnected again once the main incomer is restored. A 0-30 second delay timer will be provided to
prevent change over taking place for very short time failure. One 32 ampere circuit will be provided for
flood lights and one 16 ampere circuit for Aviation Obstruction Lighting. The aviation warning light shall
be controlled by photo electric cell facing north sky through contractor. Auto manual operation selector
switch shall be provided.
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2.21 TEMPORARY OBSTRUCTION LIGHTS
The Contractor shall provide at least two (2) lights located at diametrically opposite points at the top of
the chimney during the period of construction till the permanent obstruction lights are installed and
energised, to serve as temporary obstruction lighting.
1) APPROACHES AND FENCING
The Contractor should provide and maintain proper approaches for workmen and for inspection. The
roads and approaches around the excavated pits should be kept clear at all times so that there is no
hindrance to the movement of men, material and equipment of various agencies connected with the
Project. Sturdy and elegant fencing is to be provided around the top edge of the excavation as well as
the bottom of the fill at the surplus disposal area where dumping from a high bench is in progress.
2) LIGHTING
Full scale area lighting is to be provided if night work is permitted or directed by the Engineer-In-Charge.
If no night work is in progress, red warning lights should be provided at the corners of the excavated pit
and the edges of the fill.
2.22 SPECIAL CONDITION FOR THE USE OF CEMENT AND REINFORCEMENT IN WORK
1) CEMENT
1. The rates in Schedule-B are inclusive of cement cost. Contractor has to purchase fresh OPC 43
grade/53 grade cement confirming to IS: 8112-1991/IS: 12269 of approved Brand by GSECL, as per the
detail specifications/requirements.
2. Contractor has to construct pucca godown at site of work so that cement bags can be properly
preserved to avoid damage due to any kind of water/seepage/humidity etc.
3. Contractor has to bring sufficient quantities of cement bags as justified by Engineer in Charge to
maintain progress of work. The work should not suffer for want of cement.
4. Cement should give the required strength of cement concrete.
5. To bring sufficient & timely cement at site is full responsibility of contractor. Nothing extra will
be paid on account of any reason to maintain progress of works and to complete the works in schedule
time.
6. Contractor has to submit material account for consumption of cement used with every bills. In
case of not submitting the same, bill will not be passed. Party has to submit the copy of
cement/purchase bill along with each RA Bill/Final Bill.
7. Contractor is fully responsible for safety of cement at site; nothing will be paid extra on account
of safety.
8. If Corporation's authorized representative wants to check stock at site, Contractor has to allow
for the same at any time.
9. The contractor has to keep own day to day record of cement received & used. The contractor
or his authorized representative has to sign jointly in the Corporation's register to be maintained by the
GSECL engineers who will check & sign for receipt& consumption by J.E. ( C), D.E(C), E.E.(C) as per the
CSECL norms. The contractor has to enter all materials in to Security gate on bases of the original
Chalans/Bills. The contractor will give the original chalan/Bills duly stamped & signed of Security gate
office certifying the cement entered, to concern engineer for verification of the chalans/bills. The
contractor has to keep the copy of all these chalans/bills duly signed on it by the concern J.E.(C)/D.E.(C)
certifying on it that the quantities as mentioned, is physically checked and actually received at site. In
no case the cement entry at security gate will be allowed on the basis of contractor's letter.
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10. As far as possible, contractor has to maintain supply of cement of only one brand & grade
throughout the work and on account of closure/shortage of approved brand, cement of other brand in
accordance of conditions no. (1) will be allowed by Engineer-in-Charge.
11. Minimum cement consumption to be considered for cement concrete of various grade of
concrete will be as per the detail specifications. Contractor has to use minimum cement accordingly.
Contractor should not use less than the prescribed quantities of cement even in the case of mix design
recommends lower quantity.
12. Contractor will be allowed to carry out work only after physical verification of cement brought
at site.
13. The contractor has to carry out required testing of various materials and maintain the records
duly jointly sign with concern engineers in test register of works viz. cement, steel, mix design, concrete
cube testing, soil testing , and for other materials fittings, fixtures, tools tackles, equipment as per
tender conditions.
14. Empty cement bags are not to be returned to the corporation and contractor will be allowed to
take away with the written permission from Engineer-in-charge
2) REINFORCEMENT STEEL BARS & STRUCTURAL STEEL
a) The rates in Schedule-'B' are inclusive of Steel cost. Contractor has to purchase fresh Highly
Corrosive Rresistant Steel Rreinforcement bars confirming to relevant latest IS Specifications of
approved brand by GSECL, as per the item specification and of required sizes, diameters and sections.
� All structural steel such as M.S. angle, channel, plates, beams, flats, chequered plates, tubes
should be of required strength and should confirm the relevant I.S. specification. Rolling and Cutting
Tolerances for Steel Products should be within the permissible limits as per relevant items.
b) The steel shall be protected from mechanical damage and from deterioration rusting by
exposure.
c) The conditions as mentioned above in Cement at sr. no. (3), (4) (5) (6), (7), (8), (9), (10), (12),
(13), will also be applicable for the Steel reinforcement bars, structural steel and other costly materials
(if in bulk) such as water supply and sanitary fittings, paints, doors & pipes, construction chemicals etc.
d) The contractor will carry out the concrete pouring, only after complete checking by concern
GSECL engineer of the steel reinforcement placed and getting clearance for concrete pouring.
NOTES
1) Contractor has to observe all the procedures while entering of the all materials in to the security
gates as per the rules and their amendments enforced from time to time. The cement, steel etc. will be
allowed to enter in to the gate in the working days and during office hours only.
2) Contractor has to keep all the materials in their safe custody and preserve it properly.
Contractor is fully responsible for safe custody of their materials at site; GSECL will not be held
responsible for any theft/loss/damage/ deterioration etc. of their material.
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Approved name of Manufacturers: Allowing using steel / cementing being supplied by contractors in
civil works
The list of adopting cement and steel of companies / suppliers / manufacturers are shown below:
3.0 QUALITY CONTROL
3.1 GENERAL REQUIREMENT
All materials, components and equipment’s covered under this specification shall be procured,
manufactured, erected, commissioned, and tested at all stages, as per a comprehensive Quality
Assurance Programme. It is the Contractor's responsibility to draw up and implement such programme
duly approved by the Employer. The detailed Quality Plans for manufacturing (MQP) and Field Quality
Plans for field activities(FQP) shall be drawn up by the Bidder and will be finalized for all mutually
agreed equipments on enclosed format no. CQA/III/F Rev 0 and CQA/IV/F Rev 0 respectively.
Manufacturing Quality Plan (MQP) will detail out for all the components and equipment’s, various
test/inspection, to be carried out as per the requirements of this specification and standard mentioned
therein and quality practices and procedures followed by Contractor's/sub-Contractor's Quality Control
Organization, the relevant reference documents and standards, acceptance norms etc. during all stages
of manufacturing including raw material procurement, in-process manufacturing, assembly, and final
testing/performance testing. The Quality Plans shall be submitted to Employer in soft form for review
and Comment. Hard copies of Final Quality Plans shall be submitted for stamping and approval in
addition to soft copies. Field Quality Plans (FQP) will detail out for all the equipment’s, the quality
practices and procedures etc. to be followed by the Contractor's "Site Quality Control Organization",
during various stages of site activities starting from receipt of materials/equipment at site.
The Bidder shall also furnish copies of the reference documents/plant Standards/acceptance norm/test
and inspection procedures etc. as referred in Quality Plans along with Manufacturing and Field Quality
Plans. These Quality Plans will be subjected to Employer's approval without which manufacturer and
erector shall not proceed with the manufacturing and erection activities. These approved documents
shall form a part of the Contract. In these approved Manufacturing and Field Quality Plans, Employer
shall identify ‘Customer Hold Points’ (CHP), e.g. test/checks which shall be carried out in presence of the
Employer's representative or it's nominated outside inspection agency and beyond which the work will
Sr.
No.
Name of approved Cement Company & their
Brand Name in Market
Name of approved reinforcement
Steel/ structural steel Manufacturers
1 A.C.C. Cement A.C.C. Tata Iron & steel Co. Ltd
2 Ambuja Cement Ambuja Jindal
3 Binani Cement Binani Steel authority of India.
4 Birla Cement Birla A-1 Essar Steel Ltd
5 Gujarat Sidhee Cement Sidhee
6 J.K. Cement J.K.
7 J.K. Laxmi Cement J.K. Laxmi
8 Sanghi Cement Sanghi
9 Saurastra Cement Hathi
10 Ultratech Cement (L&T) Ultra-tech
12 Jaypee Cement Jaypee
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not proceed without consent of Employer's representative or it's nominated outside inspection agency
in writing. All deviations to this specification, approved quality plans and applicable standards must be
documented and referred to Employer along with technical justification for approval and disposition.
The Contractor shall submit to the Employer Field Welding Schedule for field welding activities for
Critical Structures etc. in the format no. APL/QA/F05 Rev 0.The field welding schedule shall be
submitted to the Employer along with all supporting documents like welding procedures, heat
treatment procedure, NDT procedures, etc. at least 90 (Ninety) days before start of erection work at
Site.
The Contractor shall have suitable Field Quality Organization with adequate manpower at Employer's
site, to implement the Field Quality Plans (FQP) and Field Quality Management System for site activities
.The Contractor shall submit the details of the proposed FQA set up (organizational structure and
manpower) for Employer's approval. The FQA set up shall be in place at least one month before the
start of site activities.
No material shall be dispatched from the manufacturer's works before the same is accepted,
subsequent to pre-dispatch and final inspection including verification of records of all previous
tests/inspection by Employer's representative or their authorized outside inspection agency and
authorized for dispatch by issuance of Material Dispatch Clearance Certificate (MDCC). All materials
used for manufacture shall be of tested quality as per relevant codes/standards. Details of results of the
test conducted to determine the mechanical properties, Chemical properties, etc. results of NDT tests, if
any conducted shall be recorded on the test certificate. All tests shall be carried out as per applicable
material specification, code requirement and as specified in Owner's Technical specification.
All welding shall be carried out as per procedure drawn and qualified in accordance with requirement of
ASME Section IX. All welding and brazing procedures shall be submitted to the Employer or it's
authorized outside inspection agency for approval prior to carrying out the welding/brazing. All welders
and welding operators employed on any part of the contract either at the Contractor's/ sub-
Contractor's works or at site or elsewhere shall be qualified as per ASME Section IX Welding procedure
qualification, welders qualification and test results shall be furnished to the employer or its authorized
inspection agency for approval. However, where required by the Employer, tests shall be conducted in
presence of employer's representative or its authorized Inspection agency. Unless otherwise proven and
specifically agreed with the Employer, Welding of dissimilar materials and high alloy materials shall be
carried out at shop only. No welding shall be carried out on cast iron components for repair and up
gradation of casting.
All the heat treatment results shall be recorded on time temperature Chart and verified with
recommended regimes. All non-destructive examination shall be performed in accordance with written
procedures as per ASTM Sec V. The NDT operators shall be qualified as per American Society of Non-
Destructive Testing or Indian Society of Non- Destructive. The result of NDT shall be recorded in a
report, which includes details of methods and equipment used, job identification no. job detail,
identification of personnel performing the test, result of evaluation and correlation of the test report
with the job. In general all plates of thickness 40 mm and above used for non-pressure application and
plates of thickness 20 mm and above used for pressure application shall be ultrasonically tested unless
otherwise specified in respective specification. The Contractor shall list out all major
items/equipment’s/components to be manufactured in house as well as to be procured from their
suppliers and sub-suppliers. All suppliers and their sub-suppliers proposed by the Contractor for
procurement of major items including casting, forging, semi-finished and finished items /equipment’s
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etc. list of which shall be drawn up by the Contractor in format no. APL/QA/F 12 Rev 0 shall be subject
to Employer's approval.
All steel materials shall be procured by the Bidder from reputed steel manufacturers. If Bidder wants to
procure steel material from SAIL authorized re-rollers, they shall obtain prior approval from owner
before placing the order. If the Contractor wants to off-load a part of the contract, they shall do so with
the consent of the owner and they shall submit their proposal for approval of suppliers and their sub-
suppliers prior to placement of orders in format no. CQA/V/F Rev 0 which will include details of
manufacturing facilities established at the respective works, their Quality Management System
followed, and experience list in manufacturing and supply of items for which proposal has been
submitted for approval along with their own technical evaluation of proposed manufacturer. The
Contractor should have their own QA and Inspection organization for carrying out inspection at
manufacturer's works and at site as per approved Quality Plan and Field Quality Plans. In case, the
Contractor proposes to engage third party Inspection Agency for carrying out inspection on his behalf,
the same shall be done only after obtaining due approval from Owner/Employer well in advance.
Employer reserves the right to carry out quality audit and quality surveillance of the system and
procedures of the Contractor and their sub-Contractors Quality Management and control activities. The
Contractor shall provide all necessary assistance to enable the Employer to carry out such audit and
surveillance.
3.2 INSPECTION AND TESTING
The word "Inspector" shall mean Employer's or Purchaser's authorized representative or nominated
Outside Inspection Agency representative acting on behalf of the Employer/ Purchaser to inspect and
examine the materials and workmanship of the equipment during it's manufacture or erection. The
Employer or his authorized representative and /or nominated outside inspection agency acting on
behalf of the Employer/Purchaser shall have access at all reasonable times to inspect and examine the
materials and workmanship of the equipment’s during its manufacturing and erection and if part of the
work is being manufactured or assembled on other premises or works, the Contractor shall obtain for
Employer/Purchaser and for his duly authorized representative or nominated outside inspection agency
necessary permission to inspect as if the materials/parts/equipment’s were manufactured or assembled
on the Contractor's own premises or works.
The Contractor shall carry out an inspection and testing of all components and equipment during
manufacture at his work and at his sub-supplier's work and at site to ensure the compliance with the
drawing, quality, conformance to functional and performance requirements of the parts and
equipment’s. Contractor shall carry out all tests/inspection required to establish that the
items/equipment’s conform to the requirements of the specification and relevant codes/standards
specified in the specification, in addition to carrying out tests as per the approved Quality Plans. Quality
audit/ surveillance/approval of the test results, inspection and acceptance of material will not, however,
prejudice the right of the Employer to reject the equipment if it does not comply with the Specification
when erected or does not give complete satisfaction in service and the above shall in no way limit the
liabilities and responsibilities of the Contractor in ensuring complete conformance of the
materials/equipment’s supplied to relevant specification, standard, data sheet, drawing etc.
Repair/rectification procedures to be adopted to make the job accept shall be subject to the approval of
the Employer/ authorized Inspection Agency.
3.3 CONFORMITY WITH DRAWINGS AND SPECIFICATIONS
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The Contractor shall carry out all the work in strict accordance with the drawings stamped "Released for
Construction" and specification issued to him and as per Contractor's detailed drawings approved by the
Consulting Engineer. Prior to concreting, the Contractor shall prepare a check list on a set format of all
items of work involved, and inform the Engineer-In-Charge well in advance so that the Engineer-In-
Charge shall have the opportunity of satisfying himself if the works mentioned in the format are done
according to drawings and specification, and he can allow the Contractor in writing to start pouring of
concrete. The entire operation of concreting shall be carried on as per specification, to the complete
satisfaction of the Engineer-In-Charge. No deviation from the drawings will be allowed unless otherwise
directed by the Engineer-In-Charge in writing.
For steelwork and metal work, the Contractor shall design all connections, inserts for scaffolding, supply
and fabricate all steelwork and metal work and furnish all connection materials in accordance with
approved shop drawings prepared by him and/or as instructed by the Engineer-In-Charge, keeping in
view the maximum utilization of the available sizes and shapes for metal components.
3.4 QUALITY ASSURANCE PROCEDURES
Before construction activities shall commence, the Bidder shall prepare a comprehensive field Quality
Assurance Procedure (QAP), covering manufacture and supply of concrete, surveying instruments to
check verticality, twist etc. of shell as constructed, physical checks as well as frequency of such checks
on shell constructed , acceptable construction tolerance, qualification and experience of personnel to
be deputed to ensure quality. OWNER/consultant will review the QAP and construction of shell shall
commence only on the basis of approved QAP.
For measurement of verticality of the shell during construction, high precision survey instruments
including laser instruments and water level system with plumb bobs shall be mobilised along with skilled
technicians and experienced supervisors. Two laser beam instruments shall be installed at diametrically
opposite points. Target plates will be fixed at the bottom of slip form assembly with square marker at
centre. Laser beam emitted from the instrument should strike the target plates exactly at centre, in case
of true verticality. Duly considering the need for constant monitoring of verticality adequate standby
shall be provided for the laser instrument. For the plumb bob method, plumb bobs shall be attached to
the underside of slip form frame and will be lowered into four barrels filled with liquid. Barrels shall
have wire cross hairs, setting target for the plumb bobs.
BIDDER shall make suitable arrangement for continuous monitoring of position of the shell. This shall be
relayed directly to the centre of the structures at their base and shall enable the degree of twist as well
as internal and external dimensions of the shell to be determined. An accurate height measuring device
shall also be installed.
Care shall be taken to prevent twist, which predominantly occurs in the initial stages because of low
slipping rate, in the horizontal plane of the slip form assembly. A thorough check on this aspect at every
15 minutes interval is essential. One experienced person shall be exclusively assigned to check the twist
and rectifying the defect.
Every endeavour has to be made to ensure that no tilt occurs in the shutter assembly. To achieve this
purpose the following steps needs to be taken.
a) i) Performance of jacks has to be closely monitored and any defective jack shall be immediately
replaced. Difference in level of opposite jacks at any point of time shall not be more than 5 mm.
b) ii) Loading on slip form truss / yoke has to be fairly equal.
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c) iii) Sleeve through which jacking rod passes has to be of sufficient length so that the latter gets
uniform clearance and does not get any chance to tilt. Sleeve should have a minimum wall thickness of
3 mm and annular clearance for jack rod shall be 1.5 mm all round.
1) PHYSICAL CHECKS
Some of the mandatory physical checks to ensure that the construction tolerances are met shall be
carried out by Bidder are listed below:
a) Twist or rotation of the slip form every 15 minutes.
b) Level of top of jacks every 30 minutes.
c) Verticality with the help of lasers every 2 hours.
d) Inside and outside diameters, dimensions and wall thickness, once in each shift of 8 hours
e) Level of top of form panels once initially and subsequently after each interruption.
f) Level of working platforms, once initially, and subsequently after each interruption
g) Batter of the form panels and yoke legs, once on erection and subsequently after each
interruption,
h) Condition of jack rods for ovality, indentation, buckling and alignment etc. before fixing each
rod.
i) Bracing/RCC jacketing of jack rods passing through openings,
j) Live loads on the working deck to avoid accidental overloads every 24 hours.
k) Workability of the concrete, at batching plant and at point of placement every hour.
l) Temperature of concrete every 4 hours
2) TOLERANCE
The construction tolerance shall be as per relevant IS or ACI codes, whichever is stringent.
a) Vertical alignment of centre point
The centre point of the shell shall not vary from its vertical axis by more than 0.001 times the height of
the shell at the time of measurement, or 1 in. (25 mm), whichever is greater. Locally, the centre point of
the shell shall not be changed by more than 1 in. per 10 ft (25 mm per 3.05 m).
b) Diameter
The measured outside shell diameter at any section shall not vary from the specified diameter by more
than 1 in. (25 mm) plus 0.01 times the specified or theoretical diameter.
c) Wall thickness
The measured wall thickness shall not vary from the specified wall thickness by more than (–6 mm),
+1/2 in. (+13 mm) for walls 10 in (250 mm) thick or less, or by more than –1/2 in. (–13 mm), +1 in. (+25
mm) for walls greater than 10 in. (250 mm) thick. A single wall thickness measurement is defined as the
average of at least four measurements taken over a 60 deg arc.
d) Openings and embedment’s
Tolerances on the size and location of openings and embedment’s in the shell cannot be uniformly
established due to the varying degrees of accuracy required depending on the nature of their use.
Appropriate tolerances for opening and embedment sizes and locations shall be established for each
chimney.
When correcting dimensional deviations on the horizontal planes, stepping of adjacent sections of
concrete shall not be permitted and deviations shall be corrected over such a length of perimeter of
shell that a smooth profile is produced. Similarly when correcting dimensional deviation in any vertical
plane, shell profile shall not change direction, other than in accordance with the required batter, and
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rise by more than 10 mm per 5 meter rise of the shell. Stepping of succeeding concrete lift shall not be
permitted.
Precision instruments using laser beams (minimum 2 nos.) shall be used for maintaining the formwork
in required axis and for carrying out various checks. Precision instruments like optical plummet to
monitor the tilt and twist in the vertical plane and horizontal plane respectively shall also be provided.
3.5 METHOD STATEMENT ALONG WITH BID
The Bidder shall furnish a brief but comprehensive statement indicating the planning, scheduling and
method of work to be followed, for the approval of Owner/consultant, at the time of submission of the
Bid. The statement shall cover at least the following items:
1) Description of the slip form equipment and its accessories.
2) Design of the scaffolding and staging
3) Description of materials including admixtures to be used for construction
4) Rate of slipping. planned interruptions and time of completion
5) Proposed workability requirement of concrete and type of cement and admixtures to be used
6) Method of manufacture and transportation of concrete
7) Method of curing
8) Rectification of defects.
9) Manpower planning, construction machinery required, stand by arrangements, space
requirements etc.
10) Quality assurance programme
11) Contingency plan for unplanned interruptions
12) Housekeeping around the site
While selecting the Bidder, due consideration will be given to the merit of the above mentioned
statement furnished by the Bidder, and minimum time of completion, apart from his past experience in
such type of works as well as technical and financial soundness of the Bidder.
3.6 ACCEPTANCE CRITERIA
All work shall conform to the requirements of the specification and the constructions shall be of the
highest standards and to the specified construction tolerances. The cast surfaces shall be free from
mortar/slurry droppings and prominent/unpleasing form marks. The exposed work shall have a
uniform/ consistent shade and appearance and should be aesthetically pleasing.
Should the limitations exceed, the contractor shall, if directed by the Engineer-In-Charge, demolish that
portion of work and recast at his own cost, to the complete satisfaction of the Engineer-In-Charge.
3.7 DETAILED CONSTRUCTION METHODOLOGY
This shall include at least the following:
1) Analysis proving adequacy of jacks, jack rods, yokes, slip forms including the support frame
work
2) Planned interruptions and operations planned during such interruptions
3) Properties of concrete such as design mix, water cement ratio, strength, workability, proportion
of retarding as well as plasticizing admixtures etc
4) Method of preparing, transporting, pouring, vibrating, finishing and curing of concrete.
5) Method of handling reinforcements
6) Rate of slipping under different weather conditions and at different levels
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7) Quantity of various materials required during each stage of construction such as but not limited
to, cement, aggregates, admixtures, reinforcements, inserts embedment, formwork for cut outs curing
compound etc., for procurement and timely supply
8) Treatment of construction joints both for planned and unplanned interruptions.
3.8 DETAILS OF CONSTRUCTION EQUIPMENT TO BE DEPLOYED
The Bidder shall furnish the following details:
1) The type and number of equipment and facilities to be used for slip forming such as, jacks,
piping, pumps, and working platforms at various levels, yokes walers, shuttering plates etc. There shall
be at least 50 % standby for jacks, jack rods, pumps, pipes etc.
2) Provision, including stand by, concrete manufacturing units, transit mixers, pumps, etc., to cater
to the planned progress of slipping.
3) Material hoists and buckets for transport of concrete, reinforcements formwork components
etc.
4) Hoist for supervising personnel.
5) Precision survey instruments including lacer instruments, for verticality checks and other
construction tolerances
6) Curing arrangements consisting of pumps, pipelines, etc. There shall be atleast 50% standby
pumps.
7) Estimation of power requirements for continuous operation of the slip form. The Bidder shall
provide for 100 % standby with DG sets.
8) Details of lighting arrangements during nights as well as details of obstruction lighting
9) Communication arrangement between ground and working deck.
3.9 SAFETY PRECAUTIONS
While all the activities in effective execution of the work, needs utmost care, keeping safety of men and
materials in mind, it is obligatory that all activities shall be carried out under the guidance of a qualified
and trained safety engineer.
Safety measures listed below shall essentially be adhered to, but should not be limited to the items
listed.
1) Safety helmets and belts to be provided to all workers and supervisory staff.
2) Safety nets to be provided below both inside and outside platforms.
3) Hand railing and toe guard to be provided around openings and platform.
4) Regular maintenance of equipment, checking of hoists, scaffolding etc.
5) Passenger hoists must have multiple ropes.
6) Emergency lights to be operative during sudden power failure.
7) Emergency standby generator to be available during the entire period of operation of slip form
equipment.
8) Ambulance and first aid facilities must be kept ready during entire period of work.
9) Barricading construction area with safety bands.
10) Display of safety related precaution boards at prominent places.
11) Sufficient illumination at night and warning alarm.
12) Placing of fire extinguishers at work platform.
Brakes, wire ropes and condition of all moving equipment thoroughly checked before and while slip
forming is in process, periodically.
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Mock drills to be conducted at monthly intervals for safety. Also it shall be ensured all safety related
requirements as per local factory regulations are in place
3.10 STRUCTURAL FABRICATION
WPS and welders qualified as per ASME Sec IX shall be used for fabrication. Bidder shall established
suitable facilities for storage, preservation, baking and holding of electrodes as per electrodes
manufacturer's guide lines. All welders employed for welding work shall be provided with suitable
electro holders with thermostat controlled heating arrangement so that temp electrodes can be
maintained above ambient condition to avoid moist pick up. All electrodes and welding wires of
approved make shall be used for fabrication. All NDT tests shall be performed by operators qualified as
per ASNT OR ISNT. Edge preparation for welding: Suitable edge as per weld joint details shall be
prepared either by machines or by automatic gas cutting process. All edges cut by flame shall be ground
to sound metal before they are welded. Cleaning prior to welding: - All surfaces to be welded shall be
free from oxide, paint, grease, and moisture. Oiled surface shall be degreased either chemically or with
suitable solvent. Degreasing shall be followed by with wire brushing. In multi-run welds brushing shall
be carried out after each layer of weld run. MS wire brush for mild steel welds and Stainless steel wire
brushes for SS Welds shall be used. Pre-heating and post heating of plates thicker than 20 mm shall be
carried out as per requirements indicated in the specification. However, requirement of pre-heating and
post heating of welded structure as required by approved WPS shall be followed.
ASSEMBLY AND FIT-UP
ALL assembly work shall be carried out using jig and fixture. Where jigging is not possible, Edges shall be
kept in alignment by tack welds spaced at regular intervals. All tack welds shall be removed before final
welding. When welding is carried out at site, additional precautions shall be taken by the Bidder to
ensure that the welding environment is protected from wind and rain. NDT test on welds shall be
carried out as per scope identified in the manufacturing drawing subject to a minimum check as
specified below ;- Fillet Weld- Check for size of welds. Visual inspection of all welds shall be performed
in accordance with AWS D.1.1. Also fillet welds for built up plate girders shall be inspected 100% by
magnetic particle examination.
Micro etch examination on production test coupons for main fillet welds with minimum one joint per
built up beams, columns and crane girder etc. per welder shall be carried out. . 25% weld length of fillet
weld of critical load bearing members shall be subjected to Dye Penetration Test. On all other fillet
welds, Dye Penetration Test (DPT) on 5% of weld length with minimum 300mm at each location shall be
carried out. Butt Welds: Visual inspection of all welds shall be performed in accordance with AWS D.1.1.
Also butt welds for built up plate girders shall be inspected 100% by magnetic particle examination. DPT
on all butt welds after back gouging.
Mechanical testing of production test coupons with minimum one joint per built up beam, column and
crane girder etc. per welder shall be carried out. Radiographic examination shall be performed on butt
welds as per FQP. Edge preparations for field welding shall be examined by MT and Ultrasonic
examination for 100mm depth.
All structure components/members shall be checked for dimensional tolerances during fabrication and
erection as per IS-7215 and IS-12843 respectively.
3.11 GALVANIZED COMPONENTS
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Structures shall be fabricated, tested and inspected as per clause no. 3.10 above to ensure that the
material and workmanship are according to relevant standards.
Galvanizing of structures shall be carried out by 7 (seven) tanks process. Bidder shall ensure that the
length of galvanizing bath is long enough to carry out galvanizing of the longest member in a single dip.
Galvanizing of any component by double dipping process or any other process which require more than
one dip is not permitted. Zinc of 99.5 % purity shall be used for galvanization. During galvanization
process, specific gravity of alkali bath, acid bath and flux bath shall be within limit and suitable record
shall be maintained. Concentration and iron content of acid bath shall also be maintained to obtain
good result. Temperature of galvanized bath shall be checked at both ends at an interval of every half
hour. The galvanized components shall be free from following defects:-
A1) Bare spot, A2) Black spot, A3) Bend, A4) Steel defects, A5) Low coating thickness. B1) White rust, B2)
Ash, B3) Dross, B4) Blisters, B5) Lumps Use of Zinc rich paint on galvanized member shall be cause of
rejection. Bidder shall not use zinc rich paint without written permission from Employer/Owner.
All tests for galvanizing including weight of Zn coating, adhesion test, zinc coating thickness and
uniformity of Zn coating (preece test) shall be carried out as per sampling plan indicated below:-
Guidelines for quantum of check on galvanized components :
1) If nos. of mark offered are 20 or less and total tonnage offered is also less than 20MT then
check all members for visual inspection for galvanizing defects,
2) If nos. of mark nos. and total tonnage offered for inspection is more than specified at sl. No. (I)
above, then 5% of the offered population of mark nos. or minimum 5 mark numbers, whichever is more
shall be selected as "FIRST SAMPLING LOT".
3) Carry out visual examination for galvanizing defects on 100% quantity of each mark number
selected as "FIRST SAMPLING LOT".
4) If there is any single rejection in visual examination, "SECOND SAMPLING LOT" of 10% of offered
population of mark nos. or 10 mark nos., whichever is more, shall be selected for visual examination.
5) Repeat (3) above.
6) If there is any single rejection due to defects mentioned at A1 to A5, the entire offered
population of mark nos. stands rejected and entire offered lot shall be defaced by sprinkling acid on
galvanized surface,
7) If the rejection is only on account of defects mentioned at B1 to B5, the lot should be
segregated and defective pieces should be regularized and reoffered for inspection. In such cases, it
should be clearly reported by the inspection engineer in his Inspection Report.
8) If the lot is considered acceptable in visual examination, carry out the following test as per
sampling plan indicated against each:-
a) Adhesion test: - Minimum 2 test samples/Lot/Section
b) Wt. of Zinc coating: - Minimum 2 test samples/Lot/Section
c) Uniformity of coating: - Minimum 2test samples/Lot/Section Lot offered is considered
acceptable, if results of all samples selected are within acceptable limit.
The bought out item list shall be finalized with the Owner for which the requirement of vendor
approval, purchase specification and quality plan will also be finalized with the Owner. All bought out
items shall be only from approved sources.
3.12 QUALITY CONTROL LABORATORY
A fully equipped quality control laboratory shall be established at site with qualified personnel to
conduct acceptance test on all construction material, weldments, concrete cubes etc. This laboratory
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shall be housed in a covered building with A/C facility as required by the testing facility. All testing
equipment shall be periodically calibrated to the satisfaction of the OWNER/CONSULTANT. All testing
shall be carried out in presence of OWNER/CONSULTANT.
3.13 WORK EXECUTION AND SUPERVISION
Bidder shall have at the site accredited and qualified engineers and foremen/supervisors with adequate
number of years of experience in execution of similar works and operators of machinery and
equipment, for satisfactory progress and timely completion of the works. The number, qualification and
experience of such staff shall be subject to Owner/consultant’s approval.
All temporary electrical installation shall be supervised by a qualified electrical supervisor of the Bidder.
The Contractor shall provide necessary engineering supervision through qualified and technical
personnel and safety requirements and furnish all skilled and unskilled labour, equipment, scaffolding,
materials, detailed execution drawings, etc. required for complete execution of the work in accordance
with the drawings, specifications, schedule of items and/or as directed by the Engineer-In-Charge. The
items and services, though not specifically mentioned but reasonably implied and necessary to
complete the job in all respects shall be provided by the Contractor at his own cost.
Wherever necessary, applicable and as required by the Engineer-In-Charge, detailed execution,
construction and development drawings for the work shall be prepared by the Contractor on the basis
of the specifications and scope/design drawings and the work shall be executed only after approval by
the Engineer-In-Charge.
Any approval, instructions, permissions, checking, review, etc., whatsoever by the Engineer-In-Charge,
shall not absolve the Contractor of his responsibility and obligation towards the adequacy, correctness,
completeness, safety, strength, workmanship, quality, target dates, etc. of the work.
Bidder shall be fully responsible for the correctness and accuracy of the works, which shall be executed
in a professional manner.
The Owner/consultant reserves the right to order from time to time, during progress of the work,
removal and re-execution of any work which is not, in the opinion of the Owner/consultant, in
accordance with the specification.
During inclement weather, rains, etc., Bidder shall suspend concreting for such time as the
Owner/consultant may direct and shall protect from damage all work already in progress or completed
just then. All such temporary protective measures shall be at Bidder's cost and any damage to works
shall be made good by the Bidder at his own expense.
Should the work be suspended by reason of strikes/riots by Bidder's own employees or any other cause
whatsoever, save and except the force majeure condition, Bidder shall take all precautions necessary for
the protection of works and make good, at his own expense, any damage arising from any of these
causes.
In the event of occurrence of any accidents at/or near the site of the work or in connection with
execution of the work, a report shall be made within 24 hours to the Owner/consultant giving full
details of the accident. He shall also report promptly such accidents to all the competent authorities
wherever such reports are required by them.
One hoist for passengers/supervisory staff and one for transport of goods shall be provided by the
Bidder. These hoists shall be operational not later than the time when construction first reaches 15 m
and should be available throughout the construction period. Access between various working levels
shall be provided by an approved system of ladders. Under no circumstances shall staging or scaffolding
be relied upon to provide such access. The Bidder shall give enough notice to Owner/consultant of his
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intention to remove access to the various areas of work as construction proceeds which would
therefore be rendered inaccessible, to allow final inspection by Owner/consultant.
The Engineer-In-Charge may require the contractor to carry out slump tests apart from taking test cubes
at regular intervals to be decided by him. All such methods of sampling and analysis of concrete shall be
in accordance with IS: 1199.
The contractor is required to employ a competent and qualified Engineer to supervise all stages in the
preparation and placing of the concrete. No concreting shall be allowed to be carried out by the
Engineer-In-Charge without such a competent person or representative being present from the
Contractor's side & without getting approval on standard inspection report & pour card. [Format
attached herewith].
The Contractor shall submit to the Engineer-In-Charge a programme of erection for his approval. All
plant, equipment, tools, tackle and any other accessories required for the erection shall be provided by
the Contractor. Storing and handling of fabricated materials for erection, setting out of members,
providing temporary supports, bracing, fasteners, bolts, nuts etc. shall be the responsibility of the
Contractor and shall be taken into account in quoting.
The Contractor shall have supervisors in attendance at all times whilst sliding is in progress. Such
supervisors shall be experienced in the control of slides, and shall be approved by the Engineer-In-
Charge.
3.14 MATERIALS TO BE USED
1) GENERAL REQUIREMENT
All materials, whether to be incorporated in the work or to be used temporarily for the construction,
shall conform to the relevant IS specifications unless stated otherwise and shall be of the quality
approved by the Engineer-In-Charge.
All materials supplied by the Bidder shall be of the best quality and shall conform to this specification.
Approval in writing shall be obtained from OWNER/CONSULTANT before any alternative or equivalent
material is proposed to be used by the Bidder.
Bidder shall furnish Manufacturer's test certificate for the materials supplied by him. In addition the
specimen of the material shall be got tested at a recognised NABL accredited testing laboratory at
Bidder's cost.
2) WATER
Water used for cement concrete mortar, plaster, grout, curing or washing of sand shall be confirming to
clause 4.3 of IS-456 clear and free from injurious amounts of Oil, Acid, Organic matters or other harmful
substances in such amounts that may impair the strength or durability of the structure. Potable water
shall generally be considered satisfactory for mixing and curing concrete.
Contractor shall test the water as and when required by the Engineer-In-Charge.
3) AGGREGATES FOR CONCRETE
GENERAL
Coarse and Fine Aggregates for concrete shall conform in all respects to IS: 383. Specifications for
Coarse and Fine Aggregates from Natural Sources for Concrete and to IS: 515. Specification for Natural
and manufactured Aggregates for use in Mass Concrete, as the case may be.
Aggregates shall be obtained from a source known to produce satisfactory concrete. Aggregates shall
consist of naturally occurring sand and gravel or stone, crushed or uncrushed, or a combination thereof.
They shall be chemically inert, hard, strong, dense, durable, clean and free from veins and adherent
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coatings and of limited porosity. Flaky and elongated pieces shall not be used. Whenever required by
the Engineer-In-Charge the Aggregates shall be washed by the contractor before use in the work.
The source of aggregates shall be approved by the Engineer-In-Charge and shall not be changed during
the course of the job without his approval. Rejected aggregates shall be promptly removed from the
worksite by the contractor at his own expense.
DELETERIOUS MATERIALS
Aggregates shall not contain any harmful material, such as iron pyrites, coat, mica, shale or similar
laminated material, clay, alkali, soft fragments, sea shells, organic impurities, etc. in such quantities as
to affect the strength or durability of the concrete and in addition to the above, for reinforced concrete,
any material which might cause corrosion of the reinforcement. Aggregates which are chemically
reactive with the alkalis of cement shall not be used.
The maximum quantities of deleterious materials in the aggregate, as determined in accordance with IS:
2386 (Part-II) Methods of Test for Aggregates for Concrete, shall not exceed the limits given in Table-I of
IS: 383. The sum of the percentage of all deleterious materials shall not exceed five. Deleterious
materials also include materials passing 75 microns IS Sieve.
COARSE AGGREGATE
Coarse aggregate is aggregate most of which is retained on 4.75 mm IS: sieve.
Coarse aggregate shall be graded crushed or broken stone from approved sources, free from impurities
and shall be screened free of dust and other deleterious matter. It shall conform to IS: 383 or IS: 515
and shall be washed clean, if necessary. The maximum size of coarse aggregate for stack superstructure
shall be 25 mm downgraded, unless otherwise stated Grading for a particular size shall conform to
relevant IS Codes and shall be such as to produce a dense concrete of specified proportion and strength
and shall be of consistency that will work readily into position without segregation.
Sound and durable crushed stone aggregates shall be used. All aggregates shall be tested for alkali
aggregate reaction. Materials, which contain high percentage of reactive silica, shall not be used. In
exceptional cases of high percentage of reactive silica content, aggregate may be allowed where low
alkali cement shall be used. Lime stone aggregate shall not generally be used for foundations which are
subjected to high temperature and repeated temperature cycles (like in the case of all machine
foundations).
FINE AGGREGATES
Fine aggregate is aggregate most of which passes 4.75 mm IS: Sieve but not more than 10% passes
through 150 micron IS: Sieve. These shall comply with the requirements of grading zones I, II and III as
given in Table-III of IS: 383. Fine aggregate conforming to grading zone IV shall not be normally used in
reinforced concrete unless tests have been made by the contractor to ascertain the suitability of the
proposed mix proportions and approved by the Engineer-In-Charge. Fine aggregates shall consist of
natural sand resulting from natural disintegration of rock and which has been deposited by streams or
glacial agencies, or crushed stone sand or crushed gravel sand.
Fine aggregate shall be river or pit sand, free from any clay, earth, vegetable matters, salt or other
impurities and shall be clean and fit for use, to the satisfaction of the Engineer-In-Charge. Sand
acceptable for the work shall normally have a grading falling within the limits of one of the three grades,
mentioned in the relevant IS Specifications.
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4) QUALITY CONTROL BACKFILL
The Contractor shall establish and maintain quality control for the various aspects of the work, method,
materials and equipment used. The quality control operation shall include but not be limited to the
following items of work:
a) Lines, Levels and Grades
a) Periodic surveys
b) Establishment of markers, boards etc.
b) Back-filling
a) Checking the quality of fill material
b) Checking moisture content of the backfill
c) Checking the degree of compaction
5) CEMENT
Refer clause 5.0 of Technical Specification
6) REINFORCEMENT
Refer clause 5.0 of Technical Specification.
7) STRUCTURAL STEEL
Refer clause 5.0 of Technical Specification.
8) CURING WATER
Curing of concrete with water shall comply with IS: 456. Contractor shall make provisions for curing with
approved Curing compound in case of non-availability of sufficient water for curing. Finished floors shall
be protected carefully until completely set. Protection of concrete against extreme weather conditions
shall comply with the code.
9) ADMIXTURES
Admixtures may be used in concrete only with the approval of the Engineer-In-Charge. Only approved
compounds of proven quality shall be permitted. The contractor shall produce test certificate from
recognized laboratories before use of admixtures, if so desired by the Engineer-In-Charge. Calcium
Chloride shall not be used as an admixture,
In case of doubt the Engineer-In-Charge may require the contractor to carry out tests, at his own
expense, for the compressive strength of concrete using admixtures, and based upon evidence that with
the passage of time to be determined by the Engineer-In-Charge the compressive strength of concrete is
not reduced by more than 10% may give his approval for their use.
10) BRICK LINERS
The size and shape of firebricks shall conform to IS: 1526 and shall be of class Group - A conforming to
IS: 6. the fireclay bricks shall be laid in fire clay mortar conforming to IS: 195. Trapezoidal bricks shall be
used where found necessary, by the Engineer-In-Charge.
Sample of bricks shall be submitted by the contractor for approval of the Engineer-In-Charge. For testing
of bricks, sample shall be taken according to the scheme given in IS: 1528-1962 for Sampling and
Physical Testing of Refractory Material. Cost for testing and incidental expenditure shall be borne by
the contractor and rates quoted shall include the cost.
3.15 STORAGE OF MATERIALS
1) GENERAL
All materials shall be so stored as to prevent deterioration and intrusion of foreign matter and to ensure
the preservation of their quality and characteristics for the work. Any material, which is deteriorated or
is damaged or is otherwise, considered defective by the Engineer-In-Charge, shall not be used for
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construction and shall be removed from site immediately, failing which the Engineer-In-Charge shall be
at liberty to get the materials removed. The Contractor shall maintain an up to date accounts of receipt,
issue and balance of all materials issued by the Owner.
2) CEMENT
Cement shall be stored in easily countable stacks with consignment identification mark above ground
level in perfectly dry and watertight sheds. Bulk cement shall be stored in air tight containers. Cement
shall be stored in a manner so as to facilitate removal of first-in first-out basis. Any cement considered
defective by the Engineer-In-Charge shall not be used by the Contractor and shall be removed from the
site immediately. Cement that has been in store for six (6) months or more shall be tested for quality.
Should at any time the Engineer-In-Charge have reasons to consider that any cement is defective, then
irrespective of its origin, date of manufacture and manufacturer's test certificate, such cement shall be
tested immediately at the Contractor's cost at an approved laboratory and until the test results are
found satisfactory the cement shall not be used on any work. The Contractor is not entitled to any claim
of any nature of this account.
The cement issued to the contractor/procured by contractor shall be stored in a suitable weather tight
building and in such a manner as to permit easy access for proper inspection. The cement shall be
stored in such a manner as to prevent deterioration due to moisture and to minimize warehouse
deterioration. Cement of different types and brands shall be kept in separate storages.
All cement stored on the site by contractor shall be arranged in batches, and used in the same order as
received from the manufacturer/owner. The contractor shall maintain cement register in which all
entries shall be completed day to day showing the quantities received, date of receipt, source of
dispatch, type of cement, etc. and also the daily cement consumption on site. This register shall be
accessible to the Engineer-In-Charge for his verification as and when required.
3) AGGREGATES
Aggregates shall be stored in easily measurable stacks on brick soling or an equivalent platform so that
they do not come in contact with dirt, clay, grass or any other injurious substances at any stage.
Aggregate of different size shall be kept in different stacks. If so desired by the Engineer-In-Charge,
aggregate from different sources shall be stacked separately with proper care to prevent intermixing.
Any aggregate delivered at site in a wet condition or becoming wet at site due to rain or any other
means shall be kept in storage for at least twenty four (24) hours to obtain adequate drainage before it
is used for concreting or the water content of the mix must be suitably adjusted as directed by the
Engineer-In-Charge
The contractor shall at all times maintain at the site of work such quantities of aggregate as are
considered by the Engineer-In-Charge to be sufficient to ensure continuity of work. Each type and grade
of aggregate shall be stored (As described in IS: 4082) separately on hard firm ground having sufficient
slope to provide adequate drainage to rain water.
Any aggregate delivered to site in a wet condition or becoming wet at site due to rain shall be kept in
storage for at least 24 hours, to obtain adequate drainage, before it is used for concreting, or the water
content of mix must be suitably adjusted as directed by the Engineer-In-Charge.
4) BRICK
Brick shall be store such that so that they do not come in contact with dirt, clay, grass or any other
injurious substances at any stage.
5) REINFORCEMENT
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Reinforcement bars shall be stored off the ground and under cover if so desired by the Engineer-In-
Charge. If necessary, a coat of cement wash shall be given to bars to guard against rusting. Reinforcing
steel shall be stored consignment wise and diameter wise.
The steel reinforcement shall be stored in such a way as to avoid distortion and to prevent corrosion
and deterioration.
6) STRUCTURAL STEEL METAL AND FITTINGS
All steel, metal and fittings to be used for fabrication and erection shall be stored section wise and
lengthwise in separate stacks, off ground, so that they can be handled, inspected, measured and
accounted for easily at any time. If required by the Engineer-In-Charge, the materials may have to be
stored in a covered shed.
The steel reinforcement and structural steel shall be stored in such a way as to avoid and to prevent
deterioration and corrosion.
Mild steel or Medium or High Tensile steel deformed bars specified for reinforcement shall conform to
the latest relevant IS Specifications and shall be of tested quality under ISI Certification Scheme. The
reinforcement shall be free from any oil, foreign material or mill or rust scales.
7) PAINTS
Paints shall be stored under cover, in air-tight containers. Paints supplied in sealed containers shall be
used as soon as possible once the container is opened. Left over paints shall be kept in air-tight
containers
8) INSULATION MATERIAL
All insulation materials like bearing insulation blocks, restraint insulation blocks, glass wool, asbestos
ropes etc. shall be stored in packing boxes, under covered shed, avoiding their coming in contact with
objectionable matter.
9) FUEL STORAGE AREA
BIDDER shall obtain necessary permission from competent authorities and establish and operate a POL
outlet with proper storage, dispensing and adequate fire fighting facility.
4.0 TESTING
4.1 GENERAL
The Contractor shall carry out all sampling and testing in accordance with the relevant IS Specifications
and as supplemented herein, for the following items or any other item as may be required by the
Engineer-In-Charge unless otherwise specified in this specification. The Contractor shall get the
specimens tested in laboratory, approved by the Engineer-In-Charge and shall submit to him, the
original test results in triplicate, within seven days after the completion of the test.
Engineer-In-Charge may present himself while such tests are being carried out.
4.2 EXCAVATION
On completion of excavation, the dimensions of the pits will be checked as per the drawings after the
pits are completely dewatered the work will be accepted after all undercuts have been set right and all
over excavations filled back to required lines, levels and grades by placing ordinary concrete of 1:4:8
proportion and/or richer and/or by compacted earth, as directed by the Engineer-In-Charge. The choice
of grade of concrete will be a matter of unfettered discretion of the Engineer-In-Charge. Over
excavation of the sides will be made good by the Contractor while carrying out the back-filling. The
excavation work will be accepted after the above requirements are fulfilled and all temporary
approaches encroaching inside the required dimension of the excavation have been removed.
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4.3 BACK-FILLING
The degree of compaction shall be sufficient to achieve a dry density of not less than 90% of proctor's
dry density at optimum moisture content as per IS-2720 (Part - VII) or a relative density of 75% as per IS-
2720 (Part-XIV) as applicable depending on the nature of back filling material as stated in clause no.
3.7.2 of this specification. The work of back-filling will be accepted after the Engineer-In-Charge is
satisfied with the degree of compaction achieved.
4.4 QUALITY CONTROL TEST
Contractor shall establish and maintain quality control for different items or work and materials as may
be directed by the Engineer-In-Charge to assure compliance with contract requirement and submit to
the Engineer-In-Charge records of the same. The contractor shall submit all records and test results in
original to the Engineer-In-Charge for his approval, if so desired by him.
The quality control operation shall include but shall not be limited to the following items of work:
1) Cement: Test to satisfy relevant IS Specifications.
2) Aggregate: Physical, Chemical and mineralogical qualities, grading, moisture contents and
impurities
3) Water: Impurities Test
4) Reinforcement: Material tests of certificates to satisfy relevant IS Specification.
5) Structural Steel: Material tests or certificate to satisfy relevant IS Specification if supplied by the
Contractor.
6) Bricks: Compressive strength, water absorption. efflorescence, warpage.
4.5 CEMENT
Representative samples shall be taken as per the relevant IS Specification from each consignment of
Cement received from the Purchaser/Manufacturer/Supplier for carrying out the tests for fineness (by
hand sieving), setting time, compressive strength and soundness tests, and the Contractor shall carry
out the above tests as per relevant Indian Standard. If the cement is supplied by the Contractor the test
shall be carried out by him. The Contractor shall carry out any or all the tests on aggregates as may be
required by the Engineer-In-Charge, in accordance with IS: 2386 Parts-I to VIII. The acceptance criteria
of the samples tested shall be in accordance with the requirements of the relevant IS specifications.
The Engineer-In-Charge may reject cement which has deteriorated owing to inadequate protection from
moisture or due to intrusion of foreign matter or other causes. Any cement which is considered
defective by the Engineer-In-Charge shall not be used, and shall be promptly removed from the site of
the work by the contractor at his own expense.
Portland cement shall be as per the requirements laid down in IS: 269.
The Contractor shall submit to the Engineer-In-Charge the manufacturer's certificate for each
consignment of cement procured if cement is supplied by him. If required by the Engineer-In-Charge,
representative samples shall be taken from each consignment and tests for fineness (by hand sieving),
setting time and compressive strengths as per IS:269 shall be carried out, free of charge by the
Contractor.
If the cement is procured by the Owner and issued to the Contractor, the Contractor shall satisfy himself
at the time of taking delivery that the quality, quantity and freshness of cement and up to the specified
standards. No complaint later on regarding the cement supplied by the Owner shall be entertained and
all rectification work on this account shall be done by the Contractor at his own cost.
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4.6 WATER
Sampling and testing of water being used for concrete works shall be carried out as per IS: 3550, by the
Contractor, at regular intervals and whenever directed by the Engineer-In-Charge. The final acceptance
criterion in case of doubt shall be as per IS: 3025.
4.7 AGGREGATES
Coarse and fine aggregate and the grading shall be as per IS: 383. It shall be free from organic or clay
coatings and other impurities, flaky particles, and any other material liable to affect the strength,
durability or appearance of concrete. Washing of aggregates by approved means shall be carried out, if
desired by the Engineer-In-Charge. The Contractor shall carry out any or all the tests on aggregates as
may be required by the Engineer-In-Charge in accordance with IS: 2386. The acceptance criteria of
samples tested shall be in accordance with the requirements of relevant Indian Standards.
In case of doubt the Engineer-In-Charge may require the contractor to carry out tests, at the
contractor's expense, in accordance with: IS: 516 - Method of Tests for strengths of concrete; and IS:
2386- Methods of Test for Aggregates for concrete, which shall be carried by contractor without any
protest.
4.8 ADMIXTURE
AIR ENTRAINING AGENTS
Initially, before starting to use Air Entraining Agents, relationship between percentage of air entrained
and the cylinder tube crushing strength vis-a-vis quantity of Air Entraining Agents used for all types of
concrete will be established by the Contractor free of charge by carrying out sufficiently large number of
tests. After that, at regular intervals and whenever directed by the Engineer-In-Charge, the Contractor
will check up free of charge, the actual percentage of air entrained and corresponding curing strengths
to correlate with the earlier test results.
OTHER ADMIXTURE
Tests for establishing the various properties of any other admixtures which may be required to be
added shall be carried out by the Contractor free of charge to the Owner.
4.9 TESTING OF CONCRETE
The Contractor shall take cubes for works test as per requirement laid down in IS: 516 regularly from
the day's pour. The number of test cubes to be taken shall be as per IS: 456. The Engineer-In-Charge
may also use his discretion in deciding the rate of cubes to be taken. The acceptance criteria are to meet
the requirement of IS: 456. If the cube test results indicate that some portions of the work is below the
required strength, the Engineer-In-Charge may order demolition of that portion of work which is below
strength and ask the Contractor to rebuild, provided a satisfactory method of load testing is not
possible. Such testing or demolishing and rebuilding shall be carried out by the Contractor.
Normally, only compression tests shall be performed but the Engineer-In-Charge may require other
tests to be performed in accordance with IS: 516.
Sampling, making up, curing and testing of specimen will comply with IS: 456, IS: 516 and IS: 1199.
Unless otherwise instructed by the Engineer-In-Charge, frequency of works tests shall be as indicated
below. The criterion for acceptance shall be in accordance with IS: 456. Sampling procedure shall
generally conform to IS: 456. Sampling frequency for each 3 grade of concrete M15 and above shall be
six (6) cubes for each 50 Cmt or part thereof, or per day concreting volume, whichever is less. Out of
each set of six (6) cubes, three (3) cubes shall be tested at seven (7) days and the remaining three (3)
cubes at twenty eight (28) days. If there is a change in batch of cement, a separate set of samples
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consisting of six (6) cubes shall be taken for each batch. In case, the stripping time for shuttering needs
to be reduced or early age strength is required to be known in specific cases, the Contractor shall carry
out at short notice testing of cubes at one (1) day and three (3) days after accelerated curing as per
IS:9013. The required number of additional samples for the same shall also be taken.
To control the consistency of concrete from every mixing plant/machine, slump tests and/or
compacting factor tests as per IS:1199 shall be carried out by the Contractor every two hours or as
directed by the Engineer-In-Charge in addition to the slump measured when making test cubes.
4.10 LOAD TEST OF STRUCTURES
The Engineer-In-Charge may instruct for a load test to be carried out on any structure if in his opinion
such a test is deemed necessary for any of the following reasons:
1) The work site made concrete test-cube failing to attain the specified strength.
2) Suspected overloading during construction of the structure under review,
3) Shuttering being prematurely removed and not as per the specification.
4) The concrete is being improperly cured.
If the results of the load test be unsatisfactory, the Engineer-In-Charge may instruct the contractor to
demolish and reconstruct the structure or part thereof at the contractor's cost. The load test of
structures shall be carried out as per the relevant causes of IS: 456.
4.11 NON DESTRUCTIVE TESTING OF CONCRETE
Quality of concrete at the bottom level of the shell is of paramount importance for of the life of the
chimney. This is the most critical section of the chimney as per design requirement. Concreting in this
section is difficult due to the presence of large number of openings and consequent congestion of
reinforcement. Hence it is necessary to test concrete at the bottom portion of chimney, irrespective of
the method adopted for concreting, by non-destructive methods and institute necessary rectification
measures if required before concreting is allowed at higher levels.
The test shall be conducted at the portion of the shell extending from top of chimney raft to a height
above the soffit of breech equal to width of the breech. The test shall be conducted using Ultrasonic
Pulse Velocity method, generally conforming to IS 13311 (Part1) and as per instruction/interpretation
given in subsequent paragraphs. The Lump Sum price of the contract is deemed to provide for
conducting the above test through a reputed and experienced agency, approved by Owner/consultant,
institute any rectification measures as required, to improve the quality of the concrete in case quality
was found lacking, and re-conduct the test by the same agency, to the satisfaction of Owner/consultant.
Considering the criticality of this portion of shell, further concreting will be allowed only after
acceptance of this reach by Owner/consultant. No increase in period of construction will be entertained
on account of this test.
The UPV test shall be carried out by direct transmission ( Cross Probing) method specified in the IS
13311.The agency undertaking the work shall depute experienced operatives for the work along with a
full time supervising engineer who has minimum five years’ experience in carrying out UPV tests on
chimney using direct transmission system. All the equipment used shall be calibrated to the satisfaction
of Owner/consultant. Necessary platforms shall be erected both inside and outside the shell with
proper access ladders to permit periodic inspection by Owner/consultant. The surface of the shell inside
shall be divided into 500x500mm grids and the grids shall be marked on the concrete surfaces. The grids
shall then be radially transferred to the outside surfaces of the shell and grid point marked. This
procedure is to ensure that the point of transmission of pulse inside and the point of receiving pulse are
located radially in the correct orientation.
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Before commencing tests on the shell, the test cubes collected from concrete poured at various levels in
the test portion shall be collected and there location marked. These cubes shall then be subjected to
UPV tests and the velocity marked on the cube and tabulated. These values will indicate accuracy of
calibration of the equipment used. This will also later furnish comparison of velocity of concrete in the
laboratory and as concreted condition. These cubes shall now be subjected to cube tests. And the
results tabulated alongside with their pulse velocity.
Field test shall commence only when the concrete is at least 28 days old. The pulse velocity values shall
be mapped accurately on the developed inside view of the chimney shell with proper locating
orientation and levels. Contours shall be drawn for velocities 4500, 4000, 3500 and 3000 meters per
second for easy identification of the relative quality of concrete.
Measured velocities above 4000 m/sec are indicative of good quality concrete and hence acceptable.
Measured velocity between 3000m/sec and 4000 m/sec indicates presence of slight porosity in the form
of voids, cracks and in some places loss of integrity. These areas shall be pressure grouted using epoxy
or polymer grouts to ensure structural integrity and revised UPV test conducted for acceptance.
Measured velocities less than 3000 m/sec is indicative of poor concrete, may require remedial measures
such as chipping, micro concreting etc with grouting after the concrete has set. The acceptance criteria
specified in this clause is final and binding on the Bidder
A detailed report on the investigation shall be prepared by the specialist agency and the Bidder shall
submit the report for review and approval by Owner/consultant. The report shall indicate remedial
measure if any to be undertaken based on the concrete quality. Details of agency and material to be
used for repairs, along with the recommendation of the product manufacturers after the report is
accepted by Owner/consultant the Bidder shall carry out the repairs using the approved material,
through approved agency. UPV tests shall be repeated in zones of repaired concrete after a lapse of 28
days after the repair work. Repair work followed by UPV tests shall be repeated in the repaired zones,
till acceptable test results are obtained. These results shall be appropriately incorporated in the detailed
final report on testing and submitted to OWNER/CONSULTANT for his final acceptance and records.
If during slip form operation at higher levels if ‘dragging’ of concrete takes place the concreting
operation shall be immediately suspended. Proper inspection by UPV tests and rectification if any
required shall be carried out before proceeding further. In such cases the OWNER/CONSULTANT at his
discretion may permit indirect method (Surface Probe)
4.12 INSULATIONS
The insulating materials shall be tested for its stipulated characteristics and properties in accordance
with the latest editions of IS: 3144 and IS: 3346 and/or as directed by the Engineer-In-Charge.
4.13 TEST REPORTS
Following Test Reports shall be furnished by the Contractor:
1) Mill Test Report for cement and reinforcing steel if the materials are supplied by the Contractor.
2) Inspection Report of bought out items.
3) Inspection Report of formwork and reinforcement, insulations etc.
4) Reports of tests of various material and concrete.
5) Radiographic tests on welded joints in steel flues.
6) Any other data or report or test result required by the relevant IS Specifications and if required
by the Engineer-In-Charge for satisfactory quality control of the workmanship.
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5.0 INFORMATION TO BE SUBMITTED
5.1 WITH TENDER
Details of Equipment proposed to be used for excavation, back-filling and compaction have to be
submitted along with the tender.
1) Tender drawing
General arrangement drawing for RCC brick Flue Stack, incorporating all relevant dimensions, material
of construction of different parts, limits of scope of supply of electrical & mechanical works, limits of
civil works included, arrangement of ladders, platforms, lightning protection system, Aviation
obstruction lighting system.
2) Design basis report
3) Technical data sheet
4) Commercial bid
A write up on the sizing and constructional details of RCC chimney with sketch showing detail of
foundation, wind shield and brick liners, insulations, along with list of appurtenances.
List of software proposed to be used in various areas for analysis, design, drafting as well as project
monitoring along with their sources and validation report for software.
List of all SUB-CONTRACTORs including Engineering Consultant that the BIDDER proposed to employ, in
case the contract is awarded to him, indicating their addresses with telephone number, experience on
similar jobs, name, qualification and experience of persons who shall be employed in the job on behalf
of the sub-CONTRACTOR etc. shall be submitted to the OWNER/CONSULTANT. Only the Sub
CONTRACTOR, approved by the OWNER/CONSULTANT shall be engaged by the BIDDER on the job.
Details of quality control laboratory which will be set up at site with a list of testing equipment.
The following technical information is required with the tender:
1) Source and arrangement of processing of aggregates proposed to be adopted.
2) Type of plant and equipment proposed to be used.
3) Names of firms with which association is sought for to execute the special items of work
4) Types of formwork proposed to be used.
5) For insulating material, tests to be offered for inspection & tests for which test certificates will
be submitted.
6) Proposal for lifting of men and material in constructing the chimney.
The Bidder shall submit the following with his formal proposal besides the different
documents/information required under this specification.
5.2 AFTER AWARD
The following information and data including samples where necessary, shall be submitted by the
Contractor, progressively during the execution of the Contract.
Programme of Execution and requirement of Materials Within 30 days of the award of the Contract, the
Contractor will submit a Master Programme for completion of the work giving month wise requirement
of materials, particularly mentioning in details the materials which are to be supplied by the Owner and
for the procurement of which the help of the Owner is required as per the terms & conditions of the
Contract. In case the Contractor proposes to take on hire any machinery or tools and plants from the
Owner, the detailed phased out programme of such hire is also to be submitted.
The master programme may have to be reviewed and updated by the Contractor quarterly or at more
frequent intervals as may be directed by the Engineer-In-Charge depending on the exigencies of the
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work. Detailed day to day programme of every month is to be submitted by the Contractor before the
commencement of the month.
After award of the Contract the successful bidder shall submit the following for approval and adoption:
a) The Contractor shall submit a detailed programme of the work as proposed to be executed
giving completion dates of excavation of the various foundations and the time required for back-filling
and compaction after completing the foundation for structures. The programme should show how the
excavation and back-filling quantities will be balanced, minimising temporary stacking of spoils. It is to
be noted that the Engineer-In-Charge even after initial approval of the programme, may instruct to
enhance or retard the progress of work during the actual execution, in order to match with the progress
of foundations without attracting any claims from the Contractor. The initial programme being
submitted by the Contractor should have sufficient flexibility to take care of such reasonable variations.
b) The Contractor shall submit drawings showing details of slopes, shoring’s, approaches, sump
pits, dewatering lines, fencing etc. for approval of the Engineer-In-Charge for adoption.
1) QUALITY ASSURANCE PROGRAMME
The Contractor shall adopt suitable quality assurance Programme to ensure that equipment and
services under the scope of Contract, whether manufactured or performed within the Contractor's
works or at his sub- Contractor's premises or at the Owner's Site or at any other place of work are in
accordance with the specifications. Such Programme shall be outlined by the Contractor and shall be
finally accepted by the Owner/ authorized representative after discussion. The QA Programme shall be
generally in line with ISO-9001.
The following information and data including samples where necessary, shall be submitted by the
Contractor, progressively during the execution of the Contract.
2) PLANNING AND SCHEDULING
Bidder should furnish a brief statement indicating the planning & program and method of work to be
followed, for the approval of Owner / Consultant at the time of submitting Tender. This statement shall
include the following items:
a) Type and description of Slip-form equipment and its accessories.
b) Standby arrangements for equipment.
c) Design of scaffolding and staging.
d) Requirement and description of materials including admixtures to be used for construction.
e) Manpower planning, construction spaces required, standby arrangement.
f) Rate of Slip-forming.
g) Proposed workability requirement of concrete and type of cement & admixture to be used.
h) Description and frequency of dimensional and vertical checks, using precision survey
instruments including lasers.
i) Description and frequency of tests for concrete and raw material.
j) Quality assurance program and Safety Methods.
k) Methods preparing, transporting, pouring, vibrating and finishing concrete.
l) Method of curing and rectification of defects.
m) Planned interruption, if proposed and activities during planned interruption, Treatment of
construction joint.
n) Contingency solution for unplanned interruptions.
o) Time of completion.
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All modifications suggested by the CONSULTANT/ENGINEER to meet specification requirements and
sound engineering practice shall be incorporated by the CONTRACTOR at no extra cost to the OWNER.
In this respect, the decision of the OWNER shall be binding on the CONTRACTOR. The CONSULTANT will
accord his approval only after the CONTRACTOR has incorporated in his fabrication drawings all
modifications required by the CONSULTANT.
Timely submission of fabrication drawings for structural steel works to the ENGINEER/CONSULTANT for
review is the sole responsibility of the CONTRACTOR and postal or other delays as reason for late/no-
submission of fabrication drawings will not be entertained.
The owner reserves the right to order from time to time, during progress of the work, removal and re
execution of any work which is not in the opinion of the Engineer-In-Charge in accordance with the
specifications and drawings.
3) SAMPLES OF MATERIALS
Samples of all materials proposed to be used shall be submitted as directed by the Engineer-In-Charge,
in sufficient quantities, for approval. All samples shall be submitted well in advance of starting work at
site. Approved samples will be preserved by the Engineer-In-Charge for future reference. The approval
of the Engineer-In-Charge shall not, in any way, relieve the Contractor of his responsibility of supplying
material of specified quality.
4) DESIGN MIX
Design mix as per details of this specification giving proportions of ingredients, sources of aggregates
and cement along with accompanying test results of trial mixes as per relevant IS Specifications shall be
submitted to the Engineer-In-Charge, for his approval, before it can be used on the work.
5) DESIGN DOCUMENTS AND DRAWINGS
Following items shall be provided by the Contractor which are to be approved by the Owner and
Consultant.
a) Design Basis Report for chimney and flue ducts
b) Detail drawings and designs of form work including scaffolding to be used. If slip form method
of construction is adopted, then detail design and drawings showing all the arrangements for slip form
technique including methods for reducing internal diameter and providing required slopes on outer
diameter.
c) Detail drawings and bar bending schedules for concrete components.
d) Shop drawings for structural steel and metal work, including inserts etc. The Contractor shall
submit his proposal for testing site and shop joints provided in steel members.
e) Detail drawings for templates and temporary supports for embedments.
f) Category wise requirements of MS, tor and structural steel including GI flats of various sizes for
procurement.
g) Detailed drawing of hoisting arrangement for men and material satisfying statutory regulations
laid down for safety purpose.
The following drawings shall be submitted within a reasonable time after placement of order:
a) General arrangement of the RCC Stack, indicating all principal dimensions with all component.
b) General arrangement & details of stack elevator.
c) Electrical Drawings and Data as specified elsewhere in the specification.
d) Detail technical particulars of equipment and materials under the scope of this specification.
e) Drawings, Data and Calculation on Civil/structural works
a) Design Basis report.
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b) Design calculation of various parts.
c) Civil/Structural drawings for construction.
d) Fabrication drawings of all steel works.
e) Bar bending details for all reinforced concrete structures.
f) Insert details, anchor bolt details.
g) Detail erection & construction arrangement.
f) Report / Results of wind tunnel studies should also be submitted along with doc. / drawings
after winning the contract and commencing work.
g) Final painting schedule.
h) Other drawings & data as necessary
The Bidder shall submit design criteria, outlining his method of analysis, design parameters not
deviating from what is specified in this specification, allowable stresses not deviating from what is
specified in this specification, method and sequence of construction including staging, details of
proposed site testing facilities, etc., strictly as per specifications for the Owner/consultant 's review and
approval within 15 days from the date of work Order.
The Bidder shall submit his design/drawing submission schedule and a construction schedule within
21days of award of contract.
The Bidder shall submit, based on the approved design criteria, detailed working drawings/ design for
the foundation (with dowels for the shell), complete and detailed general arrangement drawing for the
Owner/consultant’s approval within 30 days from the date of purchase order letter of intent, whichever
is earlier. The remaining drawings shall be submitted in a progressive manner within six months from
the date of award of contract. These designs/drawings will be returned after the Consultant’s review
within one month from date of receipt by Consultant. No claims shall be entertained due to delay in
review of the Bidder’s drawing.
In case the Bidder adopts computerised designs, only validated computer programs shall be used for the
analysis and design. The computer output listing should include all input data covering the loads and
load combinations. The Bidder shall submit typical manual calculations in order to validate the
computer program / Spread sheets used for analysis / design.
Timely submission of design/drawings to the Consultant for review is the sole responsibility of the
Bidder and postal or other delays will not be entertained as reasons for late/non-submission of
design/drawings.
All modifications suggested by the Consultant to meet specification requirements and sound
engineering practice, shall be incorporated by the Bidder at no extra cost to the Owner. In this respect,
the decision of the Owner shall be binding on the Bidder. The Consultant will accord his approval only
after the Bidder has incorporated in his design/drawings all modifications required by the Consultant.
Any modifications/change in subsequent revisions of design/drawings shall be clearly marked and
identified with a revision for the Owner/consultant’s review/approval.
Construction of work shall commence only after the written approval of drawings by the Consultant.
However, the Consultant’s approval of the design/drawings shall not absolve the Bidder of his
responsibility for correctness of design, accuracy of dimensions, loadings, details, etc., or safety and
stability of the structure including foundations, accessories, appurtenances, etc.
The bidder has to support flue duct supporting columns by boiler vendor, from the chimney foundation.
The bidder shall distribute copies of design/drawings etc prepared by him as specified in the technical
specifications.
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The Bidder shall send one copy of all correspondence to Owner’s head office and site office. The cost of
these and that due to design/drawings submission as per distribution schedule specified above is
deemed to have included in quoted rate.
6) WIND TUNNEL STUDY
The wind pressure distribution on the shell assessed theoretically shall be confirmed with the help of
model tests in a wind tunnel. Conducting the wind tunnel studies shall be entrusted to a reputed and
experienced agency approved by Owner/Consultant. The agency selected should have successfully
carried out model study in a wind tunnel at least for five projects of similar size chimneys during last 5
years. Prior to conducting the model study, Bidders shall study the whole terrain and existing structures
in and around the proposed chimney and plant boundary which will have due effect on the response of
the chimney. Interferences of all adjacent topographical features, buildings, and other structures both
present proposed & future proposed which are likely to influence the wind load pattern on the shell
shall be considered in the wind tunnel study. The model tests shall be duly witnessed and approved by
the Owner/Consultant. The model test results shall be made available before submission of design and
drawing for approval. Expenses towards such wind tunnel study shall be borne by the successful bidder.
The scope of work under wind tunnel study covers the following
a) Submission of a detailed write-up describing procedures and details of various similitude
parameters to be followed for modeling, testing and prediction of behavior of the chimney from test
results.
b) Selection of the model scale for aero elastic and rigid components of the chimney and other
adjoining structures as applicable. Recommended model scale is 1: 250.
c) Simulation of boundary layer velocity profile in the wind tunnel.
d) Prediction of oscillation amplitude, Bending Moment and Shear Force distribution along the
chimney shell for various wind excitations.
e) Recommendation for aerodynamic treatment to control high amplitude. • Study interference
effect including wake-buffeting effects due to presence of Power house Building, cooling towers, Mill
bay, Boiler etc. as indicated in the plot plan
f) Intensification factor for wind due to interference effect.
g) Modeling criteria, Mass simulation, etc.
The tests shall be carried out on the model of the proposed chimneys considering without flues and
with flues conditions. In case, provision of strakes is recommended, tests shall also be carried out with
and without strakes along with above conditions separately.
MODELING CRITERIA
Based on principle of similitude, the important non-dimensional parameters relating the prototype and
the model shall be satisfied for the model study from the point of similitude requirements. A detail
write-up shall be furnished prior to the study describing the entire process of testing and method of
satisfying the various similitude conditions such that the responses of the prototype are determined
meaningfully from those of the model. The write-up shall include following minimum.
a) Wind tunnel size.
b) Modeling of atmospheric boundary layer.
c) Determination of mean velocity profile.
d) Details of scaled model of the chimney.
e) Details of scaled models of all other structures in close vicinity of chimney.
f) Evaluation of thickness of chimney model.
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g) Effect of Reynolds number.
h) Details of instrumentation used along with sketches indicating the locations where the
instrumentation is provided.
i) Details of strakes such as size, shape, number of helices etc.
j) Similarity study for the mass distribution and damping properties of the model and prototype.
TEST PROGRAMME
a) Model design
The recommended model scale is 1:250. Fibre Reinforced Plastic (FRP) or Aluminium may be adopted as
material for fabrication of the aero elastic model considering its elastic properties besides being fairly
isotropic and homogeneous. The model shall be finalized based on General Arrangement drawing of the
chimney.
The mass distribution and damping properties should be matched with the prototype.
b) Wind and Terrain Simulation
The boundary layer wind velocity profile shall be generated following IS: 875 (Part. 3) - 1987 considering
power law exponent and terrain category. The surrounding structures shall be modeled to the same
scale as that of the model chimney using block models (rigid). An identical chimney within a distance of
200m shall also be considered in the terrain. The model of the surrounding structures shall be rotated
around the chimney so as to simulate the wind coming from different directions towards the chimney.
The wind incidence angle shall not be greater than 10o for each rotation from 0o to 360o.
c) Test Cases for Wind Tunnel Study
The wind tunnel study shall be conducted for the following cases. The test results shall be tabulated for
all the test cases mentioned below.
a) Isolated chimney without strakes and without flue liners.
b) Isolated chimney without strakes and with flue liners.
c) Isolated chimney with strakes and without flue liners.
d) Isolated chimney with strakes and with flue liners.
e) Chimney with interference, without strakes and without flue liners.
f) Chimney with interference, without strakes and with flue liners.
g) Chimney with interference, with strakes and without flue liners.
h) Chimney with interference, with strakes and with flue liners.
REPORT
Test results for all test cases as mentioned above shall be provided. The test report shall furnish the
most critical bending moments, shear forces, stresses, deflection, and peak tip deflection etc. on the
chimney at various levels along height of the chimney for the test cases indicated above.
The wind tunnel study report shall include the following as minimum:
a) The bending moments and shear forces at various levels for wind incidence angle of every 10o
(0o to 360o) and at every 10 m intervals for the entire chimney height
b) Correction factors, if any, to be applied on the computed along-wind and across-wind
responses.
c) Amplitude of displacement, both mean (static) and oscillatory components. d) Interference
factor/ proposed wind intensification to be considered in the design shall be recommended based on
Study of interference effect considering various wind directions.
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d) Recommendation of percentage of suppression due to strakes to be considered in the shell
design for the cases of shell alone condition with strakes, shell completed condition with strakes and
flue liners if strakes are proposed for the prototype.
e) Suggested arrangement of the strakes for the prototype based on the test results
f) Seven (7) copies of the report shall be submitted along with soft copies in CD.
NOTES: The response under wind load at any level to be used for design shall be the highest of the
following values:
a) As obtained for 3-sec gust wind, as per Eqn. (4)
b) As obtained for mean hourly wind, as per clause 15.3, Method 2
c) As obtained vide description in Cl.15.5(c), above.
d) Values obtained from Wind Tunnel studies
Signature of Contractor Execution and Quality Control Page 168 of 169
GUJARAT STATE ELECTRICITY CORPORATION LTD.
KACHCHH LIGNITE THERMAL POWER STATION, PANANDHRO, TA. LAKHPAT, DIST.
KACHCHH
DRAWINGS
Design, Engineering and Turnkey Execution for Construction of 190 M High RCC
Chimney, Flue Duct Foundation and related work to suit 190 M Chimney at KLTPS,
Panandhro, Gujarat
GUJARAT STATE ELECTRICITY
CORPORATION LTD. SPECTRUM TECHNO
CONSULTANTS PVT. LTD.
Signature of Contractor Tender Drawings Page 169 of 169
TENDER DRAWINGS
7) 410/T/DD-01 : PLOT PLAN
8) 410/T/DD-02 : CHIMNEY LOCATION PLAN
(Drawings provided in a separate packet)