volii specification

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TECHNICAL SPECIFICATIONS

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INDEX OF TECHNICAL SPECIFICATION

A. Technical Specification of civil works Page 1. Technical Specification for earthwork 03-83

2. Technical Specification for brick work

3. Technical Specification for stone woks

4. Technical Specification for cement concrete

(Plain & Reinforcement Concrete)

5. Technical Specification for wooden doors & windows

6. Technical Specification for glass & glazing

7. Technical Specification for finish to masonry

& concrete works

8. Technical Specification for floor finishes & allied works

9. Technical Specification for painting, white washing, etc.

10. Technical Specification for drainage and sanitary fixtures

B. Technical Specification for sanitary works

1. Technical Specification for general sanitary works 84

C. Technical Specification for Electrical works

1. Technical Specification for general electrical works 98

D. Technical Specification for Environmental works

1. Technical Specification for Environmental works 116

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TECHNICAL SPECIFICATION

FOR

EARTHWORK IN EXCAVATION/BACKFILL

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FOR

EARTHWORK IN EXCAVATION/BACKFILL

1.00 General

1.01 All work shall be executed accurately to the dimensions indicated on the drawings or as directed by the Engineer.

1.02 The contractor is responsible for inspecting, testing and making his own decision as to the actual nature of the ground to the excavated and any available trail hole data must not be Taken as a guarantee that similar conditions prevail on the site.

1.03 The contractor shall advice the Engineer when trail pits or trial hole data are available for examination so as to determine the bearing ability of the ground for foundation.

1.04 The contractor shall report to the Engineer when excavations are ready to receive foundation concrete and shall obtain consent before depositing concrete.

1.05 In the event of excavations being made larger than the sizes indicated on the drawings or as directed by the Engineer. The contractor shall fill in the excavated void to the correct profile with mass concrete a5t his own expenses and as directed by the Engineer.

2.00 Site Clearance

2.01 The sites of structures shall be cleared of all trees, bushes, scrubs, crops and all other vegetable growth including grubbing up all roots rubbish and grubbing matter shall be burned or disposes of, off site at tips to the provided by the contractor and approved by the Engineer. All combustible materials and excavated surface soil shall be spread and followed for the disposal.

2.02 All attempts must be made to maintain those trees and shrubs which are identified and instructed by the Engineer as the ones to be retained and to disturb plant life as little as possible. Where large shrubs and trees are positioned at our very near the location of a building, fence or any alternative structures or positions for structures considered.

2.03 New and Existing levels

2.03.01 Before work commences on the site, the contractor shall carry out a survey of the levels of the site and obtain the verification of the Engineer of these levels. Levels shall be taken on a grid to be agreed by the Engineer and the contractor shall produce a drawing of these levels foe record purpose.

3.00 Site Excavation

The contractor shall excavate the site throughout the area shown on the site layouts.

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3.01 Foundations Levels

The contractor shall determine the levels of the foundations in relation to the structural drawing and the excavated site level. Where undulations occur the contractor must place the top of the foundation at a level where surface water will not undermine the foundation.

3.02 Poor Ground

Top soil, loose soil, bad ground or cavities met within any part of the excavations for foundations and floor slabs of structures shall be excavated to a solid formation and filled to foundation level with hardcore or other approved materials properly compacted to the Engineer’s approval. Beneath all strip footings, the excess excavated materials shall be replaced with concrete.

3.03 Excavation in Rock

3.03.01 Any excavation where chiseling or blasting is necessary will be classified as excavation in rock, Removal of boulders of sizes up to approx. 0.5m3 shall not be classified as rock excavation.

3.03.02 The contractor shall notify the Engineer on each occasion he considers he is entitled or payment for excavation in rock and shall not fill any excavation concerned until it has been inspected by the Engineer. No payment or excavation in rock shall be made unless the Engineer has inspected the excavation and certified in writing the quantity involved. Engineer’s decision shall be final and binding.

3.03.03 In the event of use of explosives being permitted the contractor shall obtain prior approval of all relevant authorities and shall conform to safety standards and shall be fully responsible for storage and usage.

4. Shoring Excavations

4.o1 The contractor shall, to the satisfaction of the Engineer shore the sides of excavations foe structures. Trenches and pits to prevent them from slipping or failing. Should any slips, falls or settlement nevertheless occur they shall be made good by the contractor at his own expense with selected ill or with mass concrete as may be directed by the Engineer. Excavation shall be kept intact without backfilling for required period in case of basement retaining walls etc.

4.02 In removing shoring from the sides of excavations, care shall be taken to avoid bringing loads on to any concrete until it has hardened sufficiently to carry loads.

4.03 Timber or other materials used for shoring the sides of excavations shall be removed as the work proceeds except when ordered to be left in by the Engineer.

5.00 Backfilling

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5.01 Backfilling for retaining walls, basement, etc. shall be done only after the supported slab is cast, cured and deshuttered and given lateral stability to walls, Backfilling shall start only after the approval of Engineer.

5.02 Retaining walls, foundations, trenches, column, bases and the like are to be backfield with selected excavation materials or imported filling, well rammed and consolidated to the satisfaction of the Engineer, in lavers as directed but not exceeding 150mm thick and sufficiently watered during consolidating to achieve maximum consolidation. The maximum size of the material shall not be grater than 50mm, not more than 15% shall pass the 200 Sieve and it shall be free of all debris, vegetable matter and like. The density after compaction shall not be less than maximum dry density obtained in Test II of B.S. 1377

6.00 Disposal of surplus excavated materials

Surplus excavated material shall be removed from the site and disposed off to a site to be approved by the Engineer. All necessary permits and approvals of local authorities shall be the responsibility of the contractor.

7.00 Trimming of slopes

The slopes of cutting and embankments shall be trimmed by hands or by approved mechanical means to uniform batters of maximum 33 degrees as directed by the Engineer. A tolerance of plus or minus 100mm measured at right angles to the batter will be permitted. A channel 600mm wide x 300 mm deep shall be formed at the base of slopes to divert rainwater.

7.01 Any rock or boulder appearing in the face of a cutting shall trimmed back to ithin the tolerance specified above and in addition any rock or boulder which in the opinion of the Engineer is unstable shall be completely removed and the resulting void filled with compacted materials to the approval of the Engineer.

8.00 Keeping Excavations free from water

8.01 The contractor shall be responsible foe keeping all excavations free from water from whatever cause arising and shall provide such pumping capacity and other temporary works as may be necessary for this purpose.

8.02 the contractor shall make good as his own expense any damage that may result from his failure to keep the excavations free from water.

9.00 Compacted fill, Granular fill Beneath Slabs, footings etc.

9.01 The fill is to be non-plastic granular material, well graded strong, with maximum particle with size of 50mm with no more than 15% passing a 200 sieve, free of all debris, vegetable mater and the like.

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9.02 The fill is to be compacted using a vibrating compactor of not less than 1.5 tones. The fill is to be thoroughly compacted in layers as directed but not more than 150mm thick. Adequate water is to used for compaction and the density after compaction shall not be less than maximum dry density obtained in Test II of B.S.1377.

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FOR

BRICK WORK


FOR

BRICK WORK

1.00.0 SCOPE

1.01.0 This specification covers the construction of brick masonry in foundations, arches, walls, etc. at all elevations. Only masonry with first class burnt clay brick is dealt with in this Section.

1.02.0 The provision of the latest revision of IS :2212 shall be complied with unless permitted otherwise and any other I.S Codes (latest revision) shall form a part of this specification to the extent it has been referred to or applicable with this specification.

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2.00.0 MATERIALS

2.01.0 Bricks shall conform to the requirements of I.S. 1077. Specification for common burnt clay building bricks, and shall be of the first class quality.

Bricks shall be of uniform deep red, cherry or copper colour, thoroughly burnt. Without being vitrified, regular in shape and size and shall have sharp and square sides, edges and parallel faces to ensure uniformity in the thickness of the courses of brickwork.

Bricks shall be sound, hard, homogenous in texture and omit a clear ringing sound on being struck.

Brick shall be of the local standard size. Any other similar size may be accepted, but no dimension shall vary more than 3 mm from the accepted size.

All bricks which absorb water more than 20% of their own dry weight after being immersed in water for 24 hours shall be rejected.

All bricks shall have to be approved by the Engineer. Any lot of bricks found not up to the specification, must be removed from the site immediately at Contractor’s own cost. Representative samples of bricks to be used shall be submitted to the Engineer and his approval taken before bulk purchase.

The samples shall be kept sealed with the Engineer for future reference and comparisons. All bricks supplied shall conform to these approved to these approved samples in all respects.

Bricks shall be carefully and systematically stacked at locations an directed in an approved manner. East stack shall contain equal numbers of bricks preferably not more than 3000.

2.02.00 WATER

Water shall be clean and free from deleterious matter such as oil, acid, alkali, salt and vegetable growth.

2.03.00 Cement

Portland cement conforming to Indian standard specification IS: 269 shall be used. Cement shall be stored in weatherproof sheds on dry platforms and protected from rain and moisture. Cement which has partially set shall not be used. 2.04.00 Sand Sand shall conform to IS: 383, 100% of the sand shall pass through IS. Sieve No. 240 and not more than 15% to 35% through I.S. sieve No. 30. Sand shall have a fineness modulus between 2.1 and 2.5. Sand shall be clean and free from dirt, clay or other impurities. Percentage of clay or total impurities shall not be more than 5% by weight.

3.00.00 Mortar

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Mortar for brickwork except for half brick or lower thickness walls shall be 1 part cement and 6 parts sand by volume. Mortar for half brick and lower thickness brick walls shall be 1 part cement and 4 parts sand by volume.

The unit of measurement for cement shall be a bag of cement weighing 50 Kg. and this shall be taken as 0.035 cu. Meter. Other ingredients in specified proportions shall be measured in boxes of suitable size. Sand shall be measured on the basis of its dry volume. In case of damp sand, its quality shall be increased suitably to allow for bulkage.

Cement and sand shall be mixed dry thoroughly on clean approved platform and water shall then be added to obtain a mortar of the consistency of a stiff paste, care being taken to add just sufficient water for the purpose.

Mortar shall be used as soon as possible after mixing and within 2 hours after the cement is mixed wet. Mortar unused for more than 2 hours shall be rejected and removed from the site of work. Mixture of lime putty and sand can be kept for a period of 72 hours, provided it is kept damp and not allowed to dry.

4.00.00 WORKMANSHIP

All workmanship shall be of best standard as approved by the Engineer.

4.01.00 Laying

Bricks shall be soaked in water before use for at least six (6) hours. The contractor shall provide tanks of sufficient capacity to allow the specified immersion. Bricks shall be laid in water by hand and not thrown. The bricks shall not be too wet at the time of use, as they are likely to slip on the mortar bed and there will be difficulty in plumbness of the wall.

Bricks shall be laid with a shore joint in full mortar beds and thoroughly slushed up with mortar at every course. Face bricks shall be laid on full mortar beds and have all vertical joints completely filled with mortar. All brick work shall be plumb, square and true to dimensions shown on drawings and in approved bond.

All brick work shall be built tightly against columns, floor slabs or other structural parts, around window and door frames with proper distance to permit caulked joint. Where drawings indicated that structural Steel column and spandrel beams are to be partly or wholly covered with brick work, the bricks shall be built closely against all flange and webs with all spaces between the steel and the brickwork filled solid with setting mortar with not less than 10 mm in the thickness.

Bricks shall be laid in joints not more than 12 mm thick, where stucco finish is specified, the joints of brickwork shall be raked to a minimum depth of 10 mm to ensure good bond of stucco with brick work.

4.02.00 Racking out joints

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Joint of brick work shall be raked out to a depth of 12 mm at time of laying and face of brick work shall be kept clear of all mortar.

5.00.00 BRICK-ON-EDGE COPING, PLINTH PROJECTION AND CUT BRICK CORNERS

The top course of all plinths, parapets, steps and tops of walls below RCC slabs, beams, etc. shall be laid with brick –on-edge, unless specified otherwise, Care shall be taken that bricks forming the top corners and ends of walls shall be properly radiated and keyed into position in IS: 2212.

Plinths of all buildings shall be protected by brick on edge paring of minimum width of 750 mm, inter spaces filled with cement mortar (1 : 6).

5.01.00 Cavity walls

Damp proof course as one of 500 gauge polythene sheet on foundation connecting & over laping floor polythene. One extra layer of 40 cm stripped polythene sheet is to be placed on foundation under the first brick course in outer wall and going to third course of inner wall. A cement bank slopes from inner wall to outer wall. See detail. All brick walls are executed in exposed quality to both sides with half brick bonds and even joints according to standards set on drawings.

Bricks shall be laid on foundation in 2 parallel layers at stretchers with approximately 6-8 cm gap between the bricks. The outer wall measure shall be 30 cm. Following layers shall be placed with half brick bond all over.

In the horizontal joints for 4th course shall be placed a Z-wire tie for every 60 cm interval continuously. Vertically the layers of wires shall be staggered alternately in 30 cm swifts. Z-wire ties are to be produced of 8 gauge G.I. wire and in placement a slight slope towards the outer wall should be observed.

Cleaning of cavity for surplus mortar has to be observed either during laying of bricks or from missed bricks in first courses (later to be inserted ) from where scraping can be done.

Bricks on edge is placed on all windows sills.

Core reinforcement in cavity walls are done according to drawings.

One brick 9 “ partitions are constructed similar to cavity walls by stretchers in half brick bond. Z-wire transverse bonds are done in every 4 th layer per 60 cm staggered vertically . Partition walls shall be executed with fair-face to both sides.

6.00.00 CURING AND PROTECTION

Masonry during and after construction shall be kept moist and cured properly as per IS: codes of as directed by the Engineer. The brick work shall be kept moist for a period of at least 10 days.

7.00.00 SCAFFOLDING

Double scaffolding having two sets of vertical supports shall be provided except in case of building upto two storeys where single scaffolding may be used if permitted by the Engineer. The

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supports shall be sound and strong and of steal tubular construction unless otherwise permitted by the Engineer. The vertical posts shall be tied together with horizontal pieces over which the scaffolding planks shall be fixed. In cases where single scaffolding has been allowed by the Engineer, t5he inner ends of horizontal. Scaffolding poles shall rest in a hole provided in the header course only. One header for each hole shall be left out. Such holes, however, shall not be allowed in pillars under one matter in width, or immediately near the skew backs or arches. The holes left in masonry work for supporting the scaffoldings shall be immediately filed and made good before plastering.

8.00.00 METHODS OF MEASUREMENT

a) Wall thickness shall be measured in terms of nominal brick size which shall be deemed to be inclusive of mortar joints.

b) Actual volume of work done shall be measured in Cu.m. and deductions for openings, lintels, sills, conduits, ducts, pipes, etc. shall be made, but no deduction shall be made for openings upto 0.1 .SQ.M. in area each. No deduction shall be made for inserts and embedded fixtures nor any extra be made for the mortar used for fixing or for necessary cutting of bricks.

c) For encasing of steel beams, columns, etc. the sizes as shown on drawings shall be measured, and no deduction shall be made for the volume of steel beams, columns, etc.

d) No extra payment shall be made for any cutting of bricks for encasing of beams, columns etc. and/or bricks cut for any other purposes.

e) Half brick thick walls shall be measured in Sq.M. and deductions made for all openings, lintels, sills, conduits, ducts, pipes, etc. but no deduction shall be made for openings upto 0.1 Sq.M. in area each. No additions or deductions shall be made for embedded fixtures.

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FOR

STONE MASONRY

TECHNICAL SPECIFICATION FOR

STONE MASONRY 1.00.00 Scope

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1.01.00 This section covers the layout and construction of stone masonry in foundations superstructures, wall, arches, etc. at all elevations. Only masonry with good quality of quarry stones is dealt with in this section.

2.00.00 Materials 2.01.00 Stone

All stone used for this work should be hard, uniform in texture, locally the best available from the nearest quarry or elsewhere approved by the site engineer/supervisor. Samples, which are not similar to the samples supplied shall be rejected . No round stone shall be used unless broken.

Stones shall be fairly regular in size and every stone shall be fitted to the adjacent stones. No stone shall be less than 15 cm in size.

Face stones shall be comparatively larger and uniform in size and colour to given a good appearance, and breadth of face stones shall be grater than the height. Face stones should tail into wall to a sufficient depth to bound well. Stones shall be broken and faces of wall shall be truely in plumb. Corner stones or quoins should be a good stone and dressed correct to angle and laid as headers and stretches.

2.02.00 Mud

Mud to be used shall be of approved quality, obtained from foundation cuttings or borrow pits at least 1 M. below ground level. It shall be free from gravel or other foreign bodies. Soil so brought up from cuttings shall be collected first and allowed to dry completely, after which it shall be beaten down into smaller particles before being passed through a standard 20 gauge wire mesh to remove course material. The fine sieved portion shall then be collected in a pit of appropriate size before addition of water as required to produce a homogeneous mass. The mud shall be thoroughly kneaded according to local practice being taken to area of work.

2.03.00 Water

Water shall be clean and free from deleterious matter such as oil, acid, alkali, salt and vegetable growth

2.04.00 Cement

Portland cement conforming to Indian standard specification IS: 269 shall be used. Cement shall be stored in weatherproof sheds on dry platforms and protected from rain and moisture. Cement which has partially set shall not be used.

2.05.00 Sand Sand shall conform to IS: 383, 100% of the sand shall pass through IS. Sieve No. 240 and not more than 15% to 35% through I.S. sieve No. 30. Sand shall have a fineness modulus between 2.1 and 2.5. Sand shall be clean and free from dirt, clay or other impurities. Percentage of clay or total impurities shall not be more than 5% by weight.

3.00.00 Mortar

3.01.00 Mud Mortar

The mud mortar shall be made by thoroughly mixing clay with water . The quality of clay is to be used as mentioned above and must be approved by the site engineer. The

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ingredient clay shall be checked thoroughly for aggregate etc. and evenly mixed, care being taken not to add more water than is required.

3.02.00 Cement Mortar

Cement mortar shall be of proportions of 1:6 ( 1 cement; 6 course sand). The ingredient shall be accurately gauged by measure and shall be well and evenly mixed together in a mechanical pan mixer, care being taken not to add more water than is required. No mortar that has begun to set shall be used. Not more than one bag of cement shall be mixed one time, which shall be consumed within half an hour of its mixing. The work shall be well watered for a fortnight.

4.00.00 CONSTRUCTION

4.01.00 Random Rubble Masonry ( Uncoursed )

The stones shall be dressed rough to approximate shape and size before use. The maximum bushing for unplastered faces for stones shall be limited to 25 mm. On the surface to be plastered this shall not exceed 10 mm so as to incorporate lime plastering thickness within a margin of 5 mm. stones used on facing shall be to the possible extend equal in tenture. The gaps between the stones should be properly filled up by spalls. The gaps should not exceed 50 mm either way and they should never be left hollow. The joints should be well packed with mortar with a porker. In no case water should be allowed to be poured into joints. Only mortar to the required consistency shall be permitted. Bond stones shall be provided to the full width of the wall or to the tailed length of such stones. Quoins and corner stones are to be provided properly dressed to angles. The length of quoins shall be to full wall width and size suitably selected to match the courses. Care should be taken to see that joints of adjacent coursed are not in one vertical line. The mortar joints shall not exceed 25 mm in any case. Mortar used for the masonry shall be generally mud mortar unless otherwise specified. The stones to be used in jambs, reveals, sills and other places of such nature should be properly selected and dressed. All the joints should be raked out to depth 15 mm to enable pointing or lime plastering or cement plastering.

4.02.00 Coursed Rubble Masonry

The stones for such works shall be properly selected and each course shall be of same height. Stones should be semi-dressed at quarry and the final dressing shall be done at site of work by chisel and hammer. The bushings shall not exceed 20 mm. Corner stones should be properly dressed to angles. The bond stones shall be spaced 1.5 meters apart. The height of quoins should not exceed the height of the course. Vertical joints should be avoided. The joints should be raked out to a depth of 15 mm to enable pointing or lime plaster washing or cement plastering.

4.03.00 Ashlar Masonry

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The stones shall be hard, tough and durable from a approved quarry. Stones shall be chisel-dressed on all edges to have perfectly square or rectangular faces so that they may be laid in perfect horizontal and vertical joints. Minimum height of stones shall be 20 cm and breadth not less than 1.5 times height. Stones shall be laid alternate headers and streachers with breadth joints in two consecutive layers. Each course shall be truly horizontal and each stone shall be laid on its natural bed. The wall shall be truly in plumb. No joint shall he thicker than 3.5 mm. Not more than 60 mm height of masonry shall be constructed at a time. Mortar shall be mud mixed thoroughly to get a uniform workable consistency. If mortar specified as cement mortar is used it shall first have water added slowly and gradually and mixed thoroughly to get a uniform mortar of workable consistency. Fresh mortar shall be used. At the end of day’s work the masonry shall be flooded with 25 mm water at the upper surface in case of cement mortar. All stones shall be the roughed before use. Usually, exposed faces of stones are rough chiseled.

5.00.00 WORKMANSHIP

5.01.00 General construction techniques shall be in accordance with the best local traditions. The contractor shall ensure that only the most experienced of local masons are employed on random rubble works in foundation.

The selection of stone or blocks for foundation shall be convenient, placing them in position to obtain a good bond while restriction in cutting of the stones to removal of inconvenient corners only. The stones shall be laid on their natural beds as nearly as possible at right angles to the direction of the load or thrust.

5.02.00 Wetting of stones shall be necessary only in the case of very dry porous stones. Impervious stones, however, do not have to be wetted before being laid. Water absorbing natures of the various stones shall first be ascertained on samples and as far as is practicable only stones of approximately the same porosity shall be used throughout any length of walling.

5.03.00 Quoins shall be built up in advance of the main body of the wall to a height of 50 cm and adjacent wall on both sides stepped down. Quoins stones shall be more regular in shap than the main wall and shall be selected and set out on the ground before hand. They shall be carefully dressed to produce regular corners. The masonry shall be brought to courses at every 50 cm intervals. Method of wall construction shall be as per the best local traditions, using as far as possible stones that are broad on the bed and which tail-in well with adjacent stones. Void spaces shall be filled with hearting stones selected to bond in with the rest. Stones chips shall be used only to fill voids between hearting stones and to avoid use of excessive mortar. All stones shall however, be solidly and well bedded in mortar, all voids being packed with mortar.

The random rubble wall shall be brought to courses at convenient heights but not exceeding 50 cm. The course height shall correspond with the quoin stones or their multiples, as necessary. All projecting stones at levels where width of footings change

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shall be headers, with the long side tailing under the footing. Stones for face walling inside and outside has to be minimum dressed in order to receive evenly joints on all four sides.

5.04.00 Bonds shall be both transverse (across the thickness of the wall) and longitudinal. Transverse bonds shall be achieved by use of bond stones of lengths extending the full width of the wall. These shall be placed at approximately 60 cm. Vertical and horizontal intervals, staggering the stones between the two faces.

5.05.00 Joints in the wall shall be not less than 6 mm thick in to any part of the bed and shall be thick enough throughout to take up any irregularities of the stones without making a stone-too stone contact. Interior wall of 30 mm thickness shall have stones extending to the full thickness of the wall. It should be break joints with stones at least half the thickness of the wall.

5.06.00 At ground level, the wall shall be brought to course and the top finished off level with a thick layer of cement mortar (1:4) not less than 20mm thick. In the case of sloping grounds, random rubble work shall be coursed and finished level as above at the lower. Levels at the corners of the top most course shall be checked for uniformity before proceeding with further works.

5.07.00 Protective measures consisting of covering by sacking, tarpaulins or other material shall be taken during rains to prevent mortar being washed out of the joints before it has set.

6.00.00 MEASUREMENTS

The measurement shall be in cubic meter of product of length, breadth or thickness and depth ot height. All thickness of stone walls shall be measured and will be as per drawings. Deductions for floors, windows, and other openings including lintels shall be made to arrive at the net quantity of work. Nothing shall be paid extra for forming such openings. Stone work covering to R.C.C. structures and in continuation of the main wall shall be measured in thickness nearest to the figures shown in the drawing. Unless otherwise specified nothing extra shall be admissible for cutting in stone works to suit R.C.C. structure, wall in any shape other than straight, any cutting necessary for shaping the walls to structural design.

Rate shall be inclusive of all necessary scaffolding, materials, labour, curing, etc.

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FOR

CEMENT CONCRETE (PLANT AND REINFORCED)

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CEMENT CONCRETE (PLANT AND REINFORCED)

1.00.00 scope

1.01.00 This specification deals with cement, concrete, plain or reinforced for general used and covers the requirements for concrete materials, their storage, grading, mix, design strength and quality requirements, pouring at all levels, reinforcements, protection, curing, formwork, finishing, painting, admixtures, inserts and other miscellaneous works.

1.02.00 The provision of the latest revision of IS: 456 shall be complied with unless permitted otherwise and any other Indian standard Code ( latest revision ) shall form a part of this specification to the extent it has been referred to or applicable within this specification.

2.00.00 DRAWINGS PREPARED BY CONTRACTOR

Based on approved design drawing on concrete structures, contractor should prepare complete bar marking drawing/bar bending schedules and get approved from the owner/engineer before starting laying of reinforcement and concreting work. The approval of the bar bending schedules will be accorded only towards the general conformity with the design requirements and will ensure the correctness of the following :-

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a) General arrangement for centerline dimensions and levels

b) Diameter, spacing of reinforcement, shape / arrangement of reinforcement and top lengths.

The correctness of all other details like number, cutting length of each bar etc. will be entirely contractors responsibility.

The approval of the detail drawings, however, shall not relieve the contractor of his sole responsibility in carrying out the work correctly and fulfilling the complete requirements of contract document.

2.01.00 Engineer reserves the right to make changes. Revisions to drawings are very likely to be made to reflect more updated requirements. Revisions to drawings and any new drawings made to include additional work by contractor shall be considered a part of this specification and the owner shall entertain no extra claim on this account.

2.02.00 Unless otherwise specified, the drawings and specifications are intended to include everything obviously requisite and necessary for the proper and entire completion of the work and the job shall be carried out accordingly for the completeness as required.

2.03.00 In the case of variations in drawings and specifications, the decision of the Engineer shall be final . Should contractor in the execution of his work, finds discrepancies in the information furnished by Engineer, he shall refer such discrepancies to the Engineer before proceeding with such work.

3.00.00 MATERIALS

3.01.00 Cement

Cement used shall be ordinary Portland cement conforming to IS: 269 latest revision. Rapid hardening Portland cement can be used under special circumstances, if permitted by the Engineer.

3.02.00 Aggregates

All aggregates shall conform to all provisions and test methods of IS : 383 latest revision and/or IS : 515 latest revision.

Samples or aggregates, proposed to be used shall be submitted free of charge in sufficient quantities to the Engineer with sieve analysis data for his approval. Approved samples will be preserved by him for future reference. This approval will not in any way relieve the contractor of his responsibility of producing concrete of specified qualities.

3.03.00 Coarse Aggregates

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Coarse Aggregates shall consist of uncoated, hard, strong, dense and durable pieces of crushed stone, and shall be free from undesirable matters, viz disintegrated stones, soft, flaky or elongated particles, salt, alkali, vegetable matter or other deleterious substances. The amount of different undesirable substances in coarse aggregates shall not exceed the percentage limits by weight as specified in relevant IS Codes, but in no case, the total amount of all the undesirable substances shall exceed 5%

Aggregates other than crushed stone conforming to the provisions of this specification may be used under special conditions, if permitted by the Engineer.

Washing of Aggregates by approved means shall be carried out, if desired by the Engineer at no extra cost to the Owner.

The maximum size of the coarse aggregates shall be as following :-

For

Reinforced concrete including foundations – 20 mm

Ordinary Plain concrete -- 20 mm

Heavy mass concrete -- 40 mm

Grading of coarse aggregates for a particular size shall generally conform to relevant I.S. Codes and shall also be such as to produce a dense concrete of the specified proportions and/or strength and consistency that will work readily into position without segregation.

3.02.02 Fine Aggregates – sand

Sand shall consist of siliceous material, having hard , strong, durable, uncoated particles, free from undesirable amounts of dust, lumps, soft or particles or other deleterious substances. The amount of different undesirable substances shall not exceed the percentage limits by weight as specified in relevant I.S. Codes, but in no case, the total amount of all undesirable substances shall exceed 5% by weight.

Manufactured sand, other than natural sand, conforming to the provision of this specification may be used under special conditions, if permitted by the Engineer.

Washing of aggregates by approved means shall be carried out, if desired by the Engineer at no extra cost to the Owner.

Coarse and fine sand shall be well graded within the limits by weights as specified in relevant I.S. Codes. Fineness modulus shall not vary by more than plus or minus 20 percent from that of the approved sample.

3.03.00 WATER

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Water shall be clean, fresh and free from organic or other deleterious matters in solution or in suspension in such amounts that may impair the strength of durability of the concrete. Potable water is generally satisfactory.

3.04.00 Admixtures

The use of admixture in concrete for promoting workability, improving strength, entraining, air or for any other purpose may be used only with the approval of the Engineer.

3.05.00 Reinforcement

Reinforcing steel shall be clean and free from loose mill scales, dust,

loose rust and coats of paints, oil grease or other coatings, which may impair or reduce bond, It shall conform to the following I.S. specifications :

i) Mild steel and medium tensile steel bars and hard-drawn steel wire conforming to IS : 432;

ii) Deformed bars conforming to IS : 1139;

3.06.00 Formwork

Formwork shall be composed of steel and/or best quality shuttering wood of non- absorbent type. Timber shall be free from knots and shall be of medium grain as far as possible. Hard woods shall be used as caps and wedges under or over posts. Ply-wood or equivalent shall be used where specified to obtain smooth surfaces for exposed concrete work. Struts shall generally be mild steel tubes, and strong salwood.

4.00.00 STORAGE OF MATERIALS

All materials shall be so stored as to prevent deterioration or intrusion of foreign matter and to ensure the preservation of their quality and fitness for the work. Any material, which has deteriorated or has been damaged or is otherwise considered defective by the Engineer, shall not be used for concrete, and shall be removed from site immediately, failing this, the Engineer shall be at liberty to get the materials removed and the cost thereof shall be realized from the contractor’s dues.

5.00.00 GRADES OF CONCRETE

General

Concrete shall be either ordinary or controlled and in grades designated as M-15, M-20 etc. as specified in IS : 456. Lean concrete shall be 1:4:8 mix with aggregate of nominal size 40 mm maximum or as indicated in drawings.

23

5.01.00 Ordinary Concrete

Ordinary concrete is recommended only when accurate control is impracticable and not necessary. However, if ordinary concrete is allowed by the Engineer, it shall be used only in the concrete graded M-15 and M-20. Ordinary concrete does not require preparation of trial mixes.

5.01.01 Concrete mix proportions for ordinary concrete shall be as per IS : 456 and as Following :-

Table – I

CONCRETE MIX PROPORTIONS FOR NOMINAL MIX CONCRETE

Grade of concrete

Total Quality of Dry aggregates by Mass per 50 Kg. of Cement to be taken

As the sum of Individual masses

Of finding and coarse Aggregates (Max.)

Proportion of Fine Aggregates

To coarse Aggregates (by

Mass)

Quantity of Water per 50 Kg. of

Cement (Max.)

(1) (2) (3) (4) M-10

M -15

M- 20

480 Kgs.

350 Kgs.

250 Kgs.

Generally 1:2 for Fine aggregates to Coarse aggregates By volume but subject To an upper limit of 1:1.5 and a lower limit Of 1:2.5

34 Liters

32 Liters

30 Liters

(Note : Regarding explanation to the above mix proportions, refer to Table – 3 of IS : 456)

5.01.02 In proportioning concrete the quantity of cement shall be determined by actual weight. The quantities of fine and coarse aggregates may be determined by volume, but preferably by weight. If fine aggregates are moist, allowance shall be made for bulking in case of volume batching and in accordance with IS : 2386 (Part-III). Allowance shall also be made for surface water present in the aggregates when computing the water content. The amount of surface water shall be determined by one of the field methods described in IS : 2386 (Part – III). All the above data shall be maintained properly to satisfaction of the Engineer.

5.01.03 The water cement ratio shall not be more than those specified above. The cement content of any nominal mix proportion specified above shall be increased if the quantity of water

24

in a mix has to be increased to overcome the difficulties of placement and compaction, so that the water – cement ratio specified above for a particular mix is not exceeded. No extra payment shall be made to the contractor for use of the extra cement.

5.01.04 If ordinary concrete made in accordance with the proportions given above for a particular grade does not yield the specified strength and fails to satisfy the requirements of “Acceptance Criteria for Concrete” as specified in IS : 456, the cement content shall be increased as directed by the Engineer to obtain a specified strength at no extra cost of the Owner. This richer mix shall continue until the Engineer instructs otherwise.

5.01.05 Ordinary concrete proportioned for a given grade specified above shall not, however, be classified as a higher grade on the ground that the test strength were found higher than the minimum specified.

5.02.00 Controlled Concrete

Controlled concrete shall be used on all concrete works, except where specified otherwise. Controlled concrete for use in plain and reinforced concrete structures shall be in grades M-15, M-25 etc. in IS 456-78.

5.02.01 The mix proportions foe all grades of concrete shall be designed to obtain strengths corresponding to the values specified herein-after for respective grades of concrete. Preliminary tests, as specified in the I.S. Code and required by the Engineer, shall be carried out sufficiently ahead of the actual commencement of the work with different grades of concrete made from representative samples of aggregates and cement expected to total quantity of fine and coarse aggregates and the water-cement ratio required to produce a concrete of specified strength and desired workability.

5.02.02 As a guide to perform the mix design properly, the relationship between water-cement ratio, aggregate to cement ratio, workability and strength of concrete are furnished in Table – II below :

25

TABLE – II ( FOR GUIDANCE ONLY)

MIX PROPORTIONS (BY WEIGHT) EXPECTED TO GIVE

DIFFERENT DEGREES OF WORKABILITY WITH DIFFERENT

WATER-CEMENT RATIOS AND A SPECIFIED STRENGTH

Working ability Water/

Cement

Ratio

Compressive

Strength in

Cylinder in

28 days

Kg/cm²

Ratio by weight

Of cement to

Gravel aggregate

Ratio by weight of

Cement to crushed

Stone aggregate

20mm 40mm 20 mm 40 mm

Very low 0:4 360 1:4.8 1:5.3 1:4.5 1:5.0

Slump 0:5 290 1:7.2 1:7.7 1:6.8 1:7.4

o-25mm 0:6 220 1:8.5 1:8.6 1:7.8 1:8.4

0:7 160 1:9.0 1:9.0 1:8.7 1:8.9

Low 0:4 360 1:3.0 1:4.5 1:3.5 1:4.0

0:5 290 1:5.5 1:6.7 1:3.5 1:5.5

Slump 0:6 220 1:6.8 1:7.1 1:6.3 1:7.0

25-50 0:7 160 1:8.0 1:8.5 1:7.4 1:8.0

MM

Medium 0:4 360 1:3.5 1:3.8 1:3.1 1:5.6

Slump 0:5 390 1:4.8 1:5.7 1:4.2 1:5.0

50-100 0:6 220 1:6.0 1:7.3 1:5.2 1:6.2

mm 0:7 160 1:6.8 1:7.0 1:6.2 1:7.0

High 0:4 360 1:3.2 1:3.5 1:2.5 1:5.6

26

Slump 0:5 290 1:4.4 1:5.2 1:3.9 1:4.6

100-175 0:6 220 1:5.4 1:6.7 1:4.7 1:5.7

mm 0:7 160 1:6.2 1:7.4 1:5.5 1:6.5

Notwithstanding anything mentioned hereinbefore, the maximum total quantity of

aggregates by weight per 50 kg of cement shall not exceed 450 kg except where

otherwise specifically permitted by the Engineer.

5.02.03 The minimum cement content for each grade of concrete shall be as per Table 19 of IS

456.

5.02.04 At least 4 trial batches are to be made and 7 test cylinders taken for each batch noting the

slump on each mix. These cylinders shall then be properly cured and two cylinders for

each mix shall be tested in attesting laboratory approved by the Engineer at 7 days and

others at 28 days for obtaining the ultimate compressive strength. The test reports shall be

submitted to the Engineer. The cost of the mix design and testing shall be borne by the

contractor.

On the basis of the preliminary test reports for trial mix, a proportion of mix by weight

and water – cement ratio will be approved by the Engineer, which will be expected to

give the required strength, consistency and workability and the proportions so decided

for different grades of concrete shall be adhered to during all concreting operations. If,

however, at any time, the Engineer feels that the quality of materials, being used has

changed from those used for preliminary mix design, the contractor shall have to run

similar trail mixes to ascertain the mix proportions and consistency. It will be within the

competency of the Engineer to reduce the number of trail batches and then number of test

specimens mentioned above. Further, the Engineer can also allow adoption of the mixes

already tried and found satisfactory, with similar materials, for other jobs at the same site,

without any fresh design of the mix.

The mixes once approved must not be varied without prior approval of the Engineer.

Should, however , the contractor anticipate any change in the quality of future supply of

materials than that has been used for preliminary mix design, he shall inform the same to

the Engineer and bring fresh samples sufficiently ahead to carry out fresh trail mixes.

27

If permitted by the Engineer, contractor may test concrete cube specimens in place of

cylinder specimens.

5.02.05 In designing the mix proportions of concrete, the quantity of both cement and aggregate

shall be determined by weight. The engineer may allow the quantity of aggregates to be

determined by equivalent volume basis after the relationship between the weight and

volume is well established by trail and the same shall be in calibrated tanks or weighed.

All measuring equipment shall be maintained in a clean and serviceable

condition, and their accuracy periodically checked.

5.02.06 To keep the water –cement ratio to the designed value, allowance shall be made for the

moisture contents in both fine and coarse aggregates and determination of the same shall

be made as frequently as directed by the Engineer. The determination of moisture

contents shall be according to IS: 2386 (Part – III)

6.00.00 STRENGTH REQUIREMENTS

6.01.00 Where ordinary Portland cement conforming to IS:269 or Portland blast furnace slag

cement conforming to IS : 544 is used, the compressive strength requirements for various

grades of concrete shall be as shown in Table-III hereinafter. Where rapid hardening

Portland cement is used, the 28-daycompressive strength requirements specified in Table

– III shall be met in 7 days. The strength requirements specified in Table-III shall apply

to both controlled concrete and ordinary concrete.

6.02.00 The characteristic strength of concrete shall be as per Table -2 of IS : 456 – 78.

6.03.00 Concrete work found unsuitable for acceptance shall have to be dismantled and

replacement to be done as per specification by the contractor. No payment for the

dismantled concrete, the relevant formwork and reinforcement, embedded fixtures, etc.

Wasted in the dismantled portion shall be made . In the course of dismantling, if any

damage is done to the embedded items or adjacent structures, the same shall be made

good free of charge by the contractor to satisfaction of the Engineer.

6.04.00 Compressive strength requirement for different grades of concrete as specified in Table –

III with reference to 15 cm diameter x30 cm high cylinder specimen or 15 cm x15cm

cube specimen, as the case may be, shall have to be satisfied. Requirements for

preliminary tests and works tests are specified separately.

28

TABLE-III : STRENGTH REQUIREMENT OF CONCRETE

Grade of Min. Compressive strength at 28 days after mixing conducted in accordance with IS : 456 (in

KG/cm²)

Concrete for 15cm x 30 cm high For 15 cm x 15 cm

Cylinder specimen Cube specimen

Preliminary Test Works Test Preliminary Test Works Test

M-15 160 120 200 150

M-20 208 160 260 200

M-25 256 200 520 250

Other requirements of concrete strength as may be desired by the Engineer shall be in

accordance with Indian Standard IS : 456.

7.00.00 WORKABILITY

7.01.00 The workability of the concrete shall be checked at frequent intervals by slump test.

Where facilities exist and if required by the Engineer, alternatively the compacting factor

test in accordance with IS : 1199 shall be carried out.

7.02.00 The degree of workability necessary to allow the concrete to be well consolidated and to

be worked into the corners of formwork and round the reinforcement to give the required

surface finish shall depend on the type and nature of structure and shall be based on

experience and tests. The preferred limits of consistency for various types of structures,

shall be as per CI. 6 and 6.1 of IS : 456.

8.00.00 LOAD TEST

8.01.00 Load test of structural members may be required by the Engineer when the strength of

job control cylinders/cubes fall below the required strength and is not acceptable as per

“Acceptance Criteria “ of IS : 456. If the load testing is decided by the Engineer, the

member under consideration shall be subjected to a superimposed load equal to one and a

quarter (1¼) times the specified superimposed load used for design and this load shall be

maintained for a period of 24 hours before removal. The detailed procedure of the test is

to be decided by the Engineer.

8.01.01 If the member show evident failure, such changes as are necessary to make the structure

adequately strong shall be made by the contractor free of cost to the Owner. If, on the

29

other hand, the failure becomes evident, the Engineer, under special circumstances (with

the approval of the designer) , can retain the portion of the structure under test, provided

suitable modification for strengthening and/or dispersion of design load is feasible. Cost

of such modification or dispersion of load shall be borne by the contractor.

8.01.02 The member shall be deemed to have passed the test if the maximum defection at the end

of 24 hours does not exceed the deflection given by the following expression : -

D = 0.001 L²/12t

Where D = deflection

L = Length of the member, and

T = depth of the member

If the defection exceed “D” in the above formula and the member does not receiver at

least 75% observed deflection within 24 hours of removal of load, the test loading shall

be repeated after a lapse of at least 72 hours and the member shall be considered t5o have

failed to pass the test, if the recovery after the second test loading is not at least 75% of

the maximum deflection shown during the second test.

8.02.00 Load tests shall not be made until the expiry of 56 days of effective hardening of the

concrete.

8.03.00 The entire cost of load testing shall be borne by the contractor. If a portion of the

structure is found to be unacceptable, it shall be dismantled and replaced by a fresh

structure as per specification. The cost of dismantling and the cost of concrete, formwork

and reinforcement involved in the dismantling, any damage done to the embedded items

and or other adjacent structures, the same shall be made good free of charge by the

contractor to the satisfaction of the Engineer.

9.00.00 WORKMANSHIP

General

All workmanship shall be according too the latest and best possible standards.

Before stating the pour the contractor shall obtain the approval of the Engineer in a “Pour

card” maintained for this purpose. He shall obtain complete instructions about the

material and proportion to be used, slump workability, quantity of water per unit of

30

cement, number of test cylinders to be taken, type of finishing to be done any admixture

to be added etc.

9.01.00 Concrete

9.01.01 Mixing of Concrete

The proportion of fine and coarse aggregate, cement and water shall be as determined by

the preliminary tests of according to fixed proportions in case of ordinary concrete and

shall always be approved by the Engineer. The quantities of fine and coarse aggregates

shall be determined as specified hereinbefore. The quantity of cement shall always be

determined by weight. The water shall be measured accurately after giving proper

allowance for surface water present in the aggregate for which regular check shall be

made by the contractor. Due allowance shall be made for bulking in case of volume

batching in accordance with IS: 2386 (Part-III).

Concrete shall always be mixed in a mechanical mixer unless specifically approved by

the Engineer for concrete to be used in unimportant structures. The water shall not be

poured into the drum of the mixer until all the cement and aggregates constituting the

batch are already in the drum and mixed for at least one minute. Mixing of each batch

shall be continued until the mix is uniform in colour and consistency, but in no case shall

mixing be done for less than two (2) minutes and at least forty (40) revolutions after all

the materials and water are in the drum. When absorbent aggregates are used or when

the mix is very dry, the mixing time shall be extended as may be directed by the

Engineer. Mixers shall not be loaded above their rated capacity as this prevents through

mixing.

The entire contents of the drum shall be discharged before the ingredients for the next

batch are fed into the drum. No partly set or remixed or excessively wet concrete shall be

used and it 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.

When hard mixing is permitted by the Engineer for concrete to be used in unimportant

structures it shall be carried out on a watertight platform and care shall be taken to ensure

that mixing is continued until the mass is uniform in colour and consistency. In case of

31

hand mixing, extra cement @ 10% shall be added to each batch at no extra cost to the

Owner.

9.01.02 Conveying Concrete

Concrete shall be handled and conveyed from the place of mixing to the place of the final

laying as rapidly as practicable, by approved means, before the initial setting of the

cement starts. Concrete should be conveyed in such a way as will prevent segregation or

loss of any of the ingredients. If segregation does occur during transport , the concrete

shall be remixed. During very hot and cold weather, if directed by the Engineer , concrete

shall be transported in deep containers which will reduce the rate of evaporation and loss

of heat. Conveying equipments for concrete shall be well maintained and thoroughly

cleaned before commencement of concrete mixing. Such equipments shall be kept free

from set concrete.

9.01.03 Placing Concrete

Formwork and reinforcement shall be approved in writing by the Engineer before

concrete is placed. The forms shall be well wetted and all shavings, dirt and water that

may have collected at the bottom shall be removed before concrete is placed. Concrete

shall be deposited in its final position without segregation, re handling or flowing. The

interval between adding the water to the dry materials in the mixer and the completion of

the final placing inclusive of compaction of the concrete shall be well within the initial

setting time for the particular cement in use or as directed by the Engineer. As far as

possible, concreting shall be placed in the formwork by means approved by the Engineer

and shall not be dropped from a height or handled in a manner which may cause

segregation. Any drop over 180 cm shall have to be approved by the Engineer. Once the

concrete is deposited in its final position, it shall not be disturbed.

After the concrete as been placed, it shall be spaded and thoroughly compacted by

approved mechanical vibration to a maximum subsidence without segregation and

thoroughly worked around reinforcement or other embedded fixtures into the correct

form and shape. Vibrators shall not be used for pushing and shoveling concrete into

adjoining areas. Vibrators must be operated by experienced men and over vibrations shall

not be permitted. Hand temping in some cases may be allowed subject to the approval of

the Engineer. Care must be taken to ensure that the inserts, fixtures reinforcement and

32

formwork are not displaced or distorted during placing of concrete. No concrete shall be

placed in open, while it rains. If there has been any sign of washing of cement and sand,

the concrete shall be entirely removed immediately.

Suitable precautions shall be taken in advance to guard against rains before leaving the

fresh concrete unattended. No accumulation of water shall be permitted on or around

freshly laid concrete. Slabs, beams and similar members shall be poured in one operation

normally. In special circumstances, with the approval of the Engineer, these can be

poured in horizontal layers not exceeding fifty (50) cm. In depth. When poured in layers,

it must be ensured that the under layer is not already hardened. Bleeding of under layer,

if, any shall be effectively removed. Moulding, throating, drip course, etc. shall be poured

as shown on the drawing or as desired by the engineer. Holes shall be provided and bolts,

sleeves, anchors, fastenings or other fixtures shall be embedded in concrete as shown on

the approved drawings or as directed by the Engineer. Any deviation there from shall be

set right by the contactor at his own expense as-instructed by the Engineer.

9.01.04 Construction Joints

When the work to be interrupted, the concrete shall be rebated at the joint to such shape

and size as may be required by the Engineer or as shown on the drawing. All vertical

construction joints shall be made with stop boards, which are rigidly fixed and slotted to

allow for the passage of the reinforcing steel. If desired by the Engineer, keys and/or

dowel bars shall be provided at the construction joints. In the case of water retaining

structures, water stop of approved material shall be provided if so specified on the

drawing or desired by the Engineer. Construction joints shall be provided in positions as

shown or described on the drawings. Where it is not described, the joints shall be in

accordance with the following :

In a Column, the joint shall be formed about 75 mm below the lowest soffit of the beams

framing into it.

Concrete in abeam shall be placed throughout without a joint.

In forming a joint, concrete shall not be allowed to slope away to the thin edge. The

locations of construction joints shall be planned by the contractor well in advance of

pouring and have to be approved by the engineer.

Before fresh concrete is placed, the cement skin of the partially hardened concrete shall

be thoroughly removed and surface made rough by hacking, water jetting, or any other

33

method as directed by the Engineer. The rough surface shall be thoroughly wetted for

about two hours and shall be dried and coated with 1:1 freshly mixed cement sand slurry

immediately before placing the new concrete. The new concrete shall be worked against

the prepared surface before the slurry sets. Special care shall be taken to see that the first

layer of concrete placed after a construction joint is thoroughly rammed against the

existing layer. Cold joints during pour shall be treated with 1:1 freshly made cement sand

slurry only after removing all loose materials.

9.01.05 Protection and Curing of Concrete

Newly placed concrete shall be protected by approved means from rain, sun, and wind.

Concrete placed below the ground level shall be protected from falling earth during and

after placing. Concrete placed in ground containing deleterious substances shall be kept

free from contact with such ground or with water draining from such ground during

placing of concrete and placing for a period of at least three days or as otherwise

instructed by the Engineer. The grond water around newly poured concrete shall be kept

to an approved level by pumping or other approved means of drains.

Adequate steps shall be taken to prevent flooding, steps, as approved by the Engineer,

shall be taken to protect immature concrete from damage by debris, excessive loading,

vibration, abrasion, mixing with earth or other deleterious materials, etc. that may impair

the strength and durability of the concrete.

As soon as the concrete has hardened sufficiently for the surface to be marked, 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. This period may be extended, at the

discretion of the Engineer, upto fourteen (14) days.

9.01.06 Control Tests and Concrete

For the concrete of a particular specified strength, at least ix (6) test cylinders, for each

type of mix, shall be taken by the contractor for each 8 hours or less work for each

medium sized mixing plant. If the volume of concrete poured is less than 20 M3 on any

day per mixing plant. The engineer may exempt or reduce the number of test specimens

at his discretion based on the past test reports. The sampling of concrete, making the test

specimens, curing and testing procedure shall be as specified in IS : 456. The test

34

specimens shall be 15 cm dia and 30 cm high. The contractor shall get the specimens

tested in a laboratory approved by the Engineer and submit to the Engineer the test result

s in triplicate within three (3) days of the test. The contractor shall carry out the sampling

and testing according to the provisions of this specification at his own cost. No payment

shall also be made for the concrete used in specimen.

To control the consistency of concrete from every mixing plants, slump tests shall be

carried out by the contractor free of charge every two hours or as directed by the

Engineer. The amount of mixing water shall not be changed without approval of the

Engineer. Slumps corresponding to the test cylinders shall be recorded for reference.

Before commencing the work or during the progress of the work, the Engineer, if so

desires may order tests to be carried out on cement, sand or coarse aggregates, water,

reinforcing steel or transverse tests on concrete specimens, or any other relevant tests in

accordance with ISI recommendations.

The Engineer can suspend the work during the testing of any doubtful material. No claim

for any consequent loss arising out of such suspension shall be entertained.

For testing concrete, if permitted by the Engineer, cube specimens may be tested in place

of cylinder specimens.

9.02.00 REINFORCEMENT

9.02.01 Shop Drawings – Bar Bending Schedules

The controller shall prepare and furnish to the owner bar bending schedules with working

drawings for all R.C.C work , for review by the Owner/Engineer.

9.02.02 Cleaning

All steel for reinforcement shall be free from the loose scale, oil, grease, paint or other

harmful matters immediately before placing the concrete.

35

9.02.03 Bending

Unless otherwise specified, reinforcing steel shall be bent in accordance with procedure

specified in IS. 2502 or as approved by the Engineer. Bends and shapes shall comply

strictly with the dimensions in the approved Bar Bending Schedules. Bending schedule

shall be re-checked by the Contractor before bending and he shall be entirely responsible

for its correctness. Bars correctly bent shall only be used.

No reinforcement shall bent when in position in the work without approval of the

Engineer, whether or not it is partially embedded in concrete. Bars shall not be

straightened in a manner that will injure the material. Rebanding can be done only if

approved by the Engineer. Reinforcement bars shall be bent by machine or other

approved means producing a gradual and even motion. All the Bars shall be cold bent

unless otherwise approved. Bending hot a cherry-red heat (not exceeding 845 C) may be

allowed in very exceptional cases except for bars whose strength depends on cold

working. Bars bent hot shall not be cooled by quenching.

9.02.04 Placing in Position

All reinforcement shall be accurately fixed and maintained in position as shown on the

drawings by such approved means as mild steel chairs, and/or concrete spacer block. Bars

intended to be in contact, at crossing points shall be securedly bound together at all such

points by No, 20g annealed soft iron wire or by tack wielding as may be directed by the

Engineer. Binders and the like shall tightly embrace the bare with which they are

intended to be in contact and shall be securedly hold. The vertical distance between

successive layers of bars shall be maintained by provision of mild steel spacer bars. They

should be so spaced that the main bars do not sag perceptibly between adjacent spacers.

Wielding by gas or electricity may be permitted by the Engineer under suitable

conditions and with suitable safeguards in accordance with relevant Indian Standards for

wielding of mild steel bars used in reinforced concrete construction. But wielding

between ends of bar in a line, whereby stress is transferred across the section may be

allowed for mild steel bars only. In the case of bars of mild steel, which have their

strength increased by cold twisting (like cold twisted bars), the stress at the weld shall be

36

limited to the strength of the mild steel before cold twisting and the additional strength

obtained by cold twisting shall be ignored at and near the weld. As a consequence, if any

additional steel is required to be provided in the member, it shall be to the Contractors

account.

The placing of reinforcement shall be completed well in advance of concrete pouring.

Immediately before pouring, the reinforcement shall be examined by the Engineer for

accuracy of placement and cleanliness and necessary corrections as directed by him shall

be carried out. The cover for concrete over the reinforcement shall be shown as on the

approved drawings unless otherwise directed by the Engineer. Where positioning

reinforcement, they shall be made of mortar not leaner than one (1) part cement to two

(2) parts sand by volume and cured for at least seven (7) days. The sizes and locations of

the concrete blocks shall be approved by the Engineer. Laps and anchorage lengths of

reinforcing bars shall be in accordance with IS:456, unless otherwise specified. If the bars

in a lap are not of the same diameter, the smaller will guide the lap length. The laps shall

be staggered as far as practicable and as directed by the Engineer.

9.03.00 Formwork

9.03.01 General

If it is so desired, the Contractor shall be prepare, before commencement of actual work,

design and drawings for formwork and centering and get them approved by the Engineer.

The formwork shall conform to the shape, lines and dimensions as shown on the

drawings.

The centering shall be true and rigid and thoroughly braced both horizontally and

diagonally, the forms shall be sufficiently strong to carry without undue deformation, the

dead weight of the concrete as a liquid as well as working load. Where of the concrete is

vibrated, the formwork shall be strong enough to withstand the effects of vibration

without appreciable deflection, bulging, distortion or loosening of its components. The

joints in the formwork shall be sufficiently tight to prevent any leakage or mortar. The

formwork shall be such as to ensure a smooth uniform surface free from honeycombs, air

bubbles, bulges, fins and other blemishes, Any blemish or defect found on the surface of

37

the concrete must be brought to the notice of the Engineer immediately and rectified free

of charge as directed by him.

To achieve the desired rigidity, tie bolts, spacer blocks, tie wires and clamps are approved

by the Engineer shall be used but they must in no way impair the strength of concrete or

leave strains or marks on the finished surface. Where there are chances of these fixtures

being embedded, only mild steel or concrete adequate strength shall be used. Bolts

passing completely through liquid retaining walls/slabs for the purpose of acquiring and

aligning the formwork should not be used unless effective precautions are taken to ensure

water tightness after removal.

For exposed interior and exterior concrete surfaces of beams, columns, and walls,

plywood or other approved forms, thoroughly cleaned and tied together with approved

corrosion-resistant devices shall be used. Rigid care shall be exercised in ensuring that all

columns are plumb and true and thoroughly cross braced to keep them so. All floor and

beam centering shall be crowned not less than 8mm in all directions for every 5 metres

span. Unless described on the drawing for elsewhere to the contrary, beveled strips 25mm

by 25mm shall be provided, without any extra charge, to form angles and in corners of

column and beam boxes for chamfering of corners. Temporary openings for cleaning,

inspection and for pouring concrete shall be provided at the base of vertical forms and at

other places, where they are necessary and as may be directed by the Engineer. The

temporary opening shall be so formed that they can be conveniently closed when required

and must not leave any mark on the concrete.

9.03.02 Cleaning and Treatment of Forms

All forms shall be thoroughly cleaned of old concrete, wood shavings, saw dust, dirt and

dust sticking to them before they are fixed in position. All rubbish, loose concrete,

chippings, shavings, saw dust, etc. shall be scrupulously removed from the interior of the

forms before the concrete is poured. Along with wire brushes, brooms, etc. compressed

air jet and/or water jet shall be kept handy for the cleaning, if directed by the Engineer.

Before shutter is placed in position, the form surface in contact with concrete shall be

treated with approved non-staining oil or composition. Care shall be taken that the oil or

38

composition does not come in contact with reinforcing steel or existing concrete surfaces.

They shall not be allowed to accumulate at the bottom of the shuttering.

The formwork shall be so designed and erected that the forms for slabs and the sides of

beams, columns and walls may be removed first. Leaving the shuttering to the soffits of

beams and their supports in position. If formwork for column is erected for the full height

of the columns, one side shall be left open and built up in sections, as placing of concrete

proceeds. Wedges, spacer bolts, clamps or other suitable means shall be provided to

allow accurate adjustments of the formwork and to allow it to be removed gradually

without jarring the concrete.

9.03.03 Removal of Forms

The Contractor shall record on the drawings or in the other approved manner, the date on

which the concrete is placed in each part of the work and the date on which the formwork

is removed there from and have this record checked and countersigned by the Engineer.

The Contractor shall be responsible for the safe removal of the formwork, but the

Engineer may delay the time of removal if he considers it necessary. Any work showing

signs of damage through premature removal of formwork or loading shall be entirely re-

constructed without any extra cost to the Owner.

Forms for various types of structural components shall not be removed before the

minimum specified days as indicated in CI.10.3 of IS: 456-78 which shall also be subject

to the approval of the Engineer.

9.03.04 Tolerance

The formwork shall be so made as to produce a finished concrete, true to shape, lines,

levels, plumb and dimension as shown on the drawings subject to the following

tolerances unless otherwise specified in this specification or drawings or directed by the

Engineer.

For:

a) Sectional dimension - 5mm

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b) Plumb - 1 in 1000 of height

c) Levels - 3 mm before any deflections

has taken place

9.03.05 Re-use of Forms

Before re-use, all forms shall be thoroughly scraped, cleaned, joints etc. examined, and

when necessary repaired, and inside surface treated as specified here in before. Formwork

shall not be used/re-used, if declared unfit or unserviceable by the Engineer.

9.03.06 Classification

Ordinary

These shall be used in places where ordinary surface finish is required and shall be

composed of steel and or approved good quality seasoned wood.

Plywood

These shall be used in exposed surfaces, where a specially good finish is required and

shall be made mostly of approved brand of heavy quality plywood to produce a perfectly

level, uniform and smooth surface. Re-use may only be permitted after special inspection

and approval by the Engineer. He may also permit utilization of used plywood for the

“ordinary” class.

9.04.00 Exposed Surfaces

9.04.01 Interior

Imperfect surfaces, where strength is not the criteria shall be patched and rubbed smooth

with carborundum stone. Immediately after the formwork is stripped off, fins and

projections shall be rubbed smooth to satisfaction of the Engineer.

9.04.02 Exterior

Imperfect surfaces shall not be patched, but shall be repaired by removal and replacement

of the member or as directed by the Engineer. Small voids shall be fitted with 1:2 cement

40

mortar pressed into holes and floated smooth. Plastering and steel trowelling of surfaces

shall not be allowed except in exceptional cases as may be directed by the Engineer. Fins

and projection shall be treated as 9.04.01 above.

9.05.00 Anchor Bolts, Anchors, Opening, Sleeves, Inserts and Other Built-in Fixtures.

The Contractor shall provide openings, grooves, chases, etc. in concrete work as required

for erection of equipment and structures. He shall build into concrete work all the

materials noted below and shall embed and secure the same as when required. The

material shall be of best quality available of approved manufacturer and shall be upto

satisfaction of the Engineer. Exposed surfaces of embedded materials are to be painted

with one coat of approved anti-corrosive paint and/or bituminous paint without any extra

cost to other Owner.

Materials to be embedded

i) Inserts, hangers, anchors, opening frames, manhole cover, frames, sleeves and

conduits;

ii) Anchor bolts and plates for machinery, equipment and for structural steel work;

iii) Dowel bars, etc. for concrete work;

iv) Lugs or plugs for door and window frames occurring in concrete work;

v) Flashing and jointing in concrete work;

vi) Any other built-in-fixtures as may be required.

Correct location, exact alignment etc. of all these shall be entirely the responsibility of the

Contractor.

9.06.00 Joints, etc

9.06.01 Expansion and Isolation Joints

Expansion joints in concrete structures shall be provided at specified places as indicated

on the drawings. The materials and types of joints shall be as specified below. In case of

liquid retaining structures, additional precaution shall be taken to prevent leakage of

liquids as may be specified on the drawings or as directed by the Engineer. All materials

41

to be procured from reliable manufacturers and shall have approval of the Engineer. The

Engineer may demand test certificates for the materials and/or get them tested.

9.06.02 Bitumen Board

Bitumen impregnated fibre boards of approved manufacture as per IS: shall be used as

fillers for expansion joints. It must be durable and waterproof. It shall be compressible

and posses a high degree of recovery after compression is released. At the exposed and

the joint shall be sealed with approved sealing compound to a depth of 25mm after

application of an approved primer. The sealing compound and tip primer shall be applied

as specified by the manufacturer.

9.06.03 Bitumen compound

The gap for expansion joints shall be thoroughly cleaned and the bitumen compound laid

as per manufacturer’s specification. The compound to be used shall be approved

manufacturer and shall conform to the requirements of IS: 1834.

9.06.04 Separation Joints

Strong and tough alkathene sheet or equivalent of about 1mm thickness as approved by

the Engineer shall be used. It shall be stuck by an approved sticker to the cleaned surface

of 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.

9.06.05 Rubber Pad

Hard foundation quality rubber pads of required thickness and shape shall be put below

machine or other foundation where required as shown on the drawings or as desired by

the Engineer. The rubber shall be of best quality of approved manufacturer, durable,

capable of absorbing vibration and must be chemically inert and in contact with moist or

dry under normal conditions.

9.07.00 Grouting

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9.07.01 Pressure Grouting

Provisions rock, fissures, etc. under foundation shall be grouted and sealed, if required.

Grout shall be composed of cement and water, except that of wider seams, sand or 6mm

down stone chips may have to be used in the mixture as directed by the Engineer. The

mix for grouting shall be 1 part cement and 1 part sand. The location and depth of grout

holes shall be as directed by the Engineer. Grout shall be placed at pressure upto 14 Kg

per Sq.Cm. or as required by approved grouting machine.

9.08.00 Precast Concrete

The specification for precast concrete will be exactly similar as for the cast-in place

concrete described hereinafter. All precast work shall be carried out in a yard made of the

purpose. This yard shall have a hard and leveled platform made of concrete or grouted

brick soling finish smooth with neat cement plaster overlaid by a layer of G.I. plain

sheets, curing tank and such other facilities. The moulds shall preferably be of steel or of

wood lined with G.I. sheet metal. The yard shall preferably be fenced.

Lifting hooks shall be embedded in correct position of the unit to facilitate erection, even

though they may not be shown on the drawings, and shall be burnt off and finished after

erection.

Precast concrete planks after 28 days of casting and curing ready for erection shall be

transported to site by suitable means approved by the Engineer. All care shall be taken

that no damage occurs during transportation. All adjustments, leveling and plumbing

shall be done as per instruction of the Engineer. The contractor shall render all help in

instruments, materials and men to the Engineer for checking the proper erection of the

precast units. The joint between precast planks shall be pointed with 1;2 cement sand

mortar where called for on the drawing.

10.00.00 WATERPROOF OF CONCRETE STRUCTURES

The material shall conform to the respective I.S.Code wherever applicable, the

Engineer’s approval to the materials shall be obtained by the contractor before

43

procurement. If desired by the Engineer, test certificates for the materials shall be

submitted by the contractor and samples for testing by the purchaser shall be supplied

free. The materials shall be of the best quality available indigenously, fresh and

thoroughly clean.

10.01.00 Ribbed Rubber

The material must be very durable and tough. The ribs shall be sufficient to ensure bond

with concrete. The width shall be minimum 100mm and thickness minimum 3 mm. The

rubber water stop must be used in long length to avoid splicing as far as possible. Each

shall have at least 230mm overlaps and stuck with a reliable sticker compound, or

vulcanized.

10.02.00 P.V.C Sealing Strips

P.V. C. sealing strips shall be used for Expansion Joints. The minimum thickness of

P.V.C. sealing strips will be 3 mm and the minimum width 150 mm. the actual size and

shape will have to be specified in drawings. 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. The physical properties will

generally be as follows:

Sp.gr. : 1.3 to 1.35

Shore hardness : 60A to 80A

Tensile strength : 100 – 150 kg/cm2

Min. safe continuous : 700C

Ultimate elongation : Not less than 275%

10.03.00 G.I. Strips

G.I. Strips shall be minimum of 22 gauge and 230mm width. It shall be strong and

durable. Longest lengths available shall only be procured. At joints strips shall be lapped

150 mm and brased thoroughly to prevent any leak.

44

These shall be placed in position very securedly so as not to get dislodged or distorted

during placing of concrete. G.I. strips to be used in construction joints.

10.04.00 Waterproofing Admixtures

10.04.01 In Concrete

The admixture shall be the right variety of Sika, Xypex, Lilax, Silvicon, ‘CICO’ or

equivalent water proofing cement additive which conforms to IS: 2645. Water proofing

additive shall be as far as possible free from aggressive chemicals like chlorides,

sulphides, etc. which can cause corrosion of steel reinforcement in R.C.C.

10.04.02 in Plaster

The concrete surface to be plastered, to be hooked to Engineer’s satisfaction. The plaster

shall be made of cement, sand and the approved water-proofing admixtures as per

manufacturer’s specification. The admixture shall be “IMPERMO” or equivalent as

approved by the Engineer. If desired by the Engineer, the Contractor shall have the work

supervised by the manufacturer’s supervisor at no extra cost to the owner.

10.05.00 Bituminous Coating

Surface to be waterproofed shall be absolutely dry, clean and dust free. The surface shall

be completely coated with hot coal tar pitch as per IS: 216 (not heated above 375 F) using

not less than 2 kg per Sq.M or with hot asphalt i.e. bitumen according to IS: 73 (not

heated above 400 f) using not less than 1.5 Kg per Sq.M. When the first coat has

completely dried up and passed by the Engineer, 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 complete. Sufficient time shall be

allowed after spreading of sand before backfilling is done in order to allow the final coat

to dry up complete. Coal tar or asphalt to be used shall be approved manufacture and of

the best quality available.

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10.06.00 Bitumen Felt

If specified or desired by the Engineer, structures shall be made damp-proof by courses

of bitumen felt and blown bitumen. The contractor shall entrust the to one of the well

known firms approved by the Engineer.

The material shall conform to IS: 1322, and the workmanship to IS: 1609. The bitumen

felt shall be of hessian based. If demanded by the Engineer, tests as specified in IS codes

shall be organized by the contractor without charging any extra cost to the owner.

Cleaning the surface, keeping it dry, providing necessary corner fillets and cement

rendering and cutting chases shall be carried out. Protective brickwork, concrete sub-

bases or walls are to be included in the bid.

10.07.00 Damp-water proofing

Multiple layer damp-water proofing treatment for basement and structure below G.I. shall

be done in accordance with IS: 1609 and 3067. The type of treatment shall depend upon

the depth of the structures below sub-soil water level and shall be as shown on the

drawing or as decided by the Engineer.

10.08.00 Other Admixture in Concrete

The Engineer may at his description instruct the Contractor to use any admixture in the

concrete.

11.00.00 RATE

The rate for any item in the schedule, unless specifically excluded in the contract, shall be

deemed to include the cost of all materials consumed or used in the work or incidental to

it as well as labour, tools, plants, equipments, template, supports, scaffolds, approaches,

security and security measures, power, fuel, lubricants, storage, handling, transport,

testing, insurance, taxes, royalties and other revenue expenses, accommodation, services,

46

supervision, overheads, profits, etc. The various items of work which are to be provided

are mentioned under clauses 1.01.00 and elsewhere in this specification. If no separate

item is provided for any such work in the schedule of item it is implied that the

Contractor shall not claim for any extra item but shall include the cost of all such work in

the rates of the connected items of the schedule viz. detailed drawings and bar banding

schedule in the item of reinforcement, design and drawing of formwork in the item of

formwork or concrete, etc.

12.00.00 METHOD OF MEASUREMENT

12.01.00 Concrete

Actual volume of work as executed or as per drawings issued, whichever is less shall be

measured by volume. Deduction for openings, conduits, pipes, ducts, pockets, chases, etc.

shall be made provided they are larger than 0.1 Sq.M. in area each.

No deduction shall be made for embedded fixtures including reinforcement, sleeves,

anchor bolts and similar items.

12.02.00 Precast Concrete

Precast concrete work shall be measured in the same way as specified under clause 11.01.

No separate payment shall be made for formwork. Lifting hook where required in the

design, shall be treated as reinforcement steel and paid accordingly. Payment shall be due

only after erection, grouting and curing of precast units in proper position unless

otherwise provided for in the Contract. All breakage and damages of the precast units

shall be to the Contractor’s account and shall be replaced free of charge to the Owner.

12.03.00 Concrete perforated Units

Concrete perforated units shall be measured on gross areas of erected units. No separate

payment shall be made for formwork, fixtures, etc.

12.04.00 Admixtures

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Admixtures shall be measured on the basis of theoretical requirement or actual

consumption, whichever is less. No separate payment shall be made if the material is

supplied free by the Owner.

12.05.00 Reinforcement

a) Bar or any other type of reinforcement used like hard drawn steel wire fabric etc.

for reinforced concrete shall be measured by weight in Tonnes The weight shall

be arrived at by multiplying the actual or theoretical length, whichever is less, by

the sectional weights.

Claims for payment for this item shall be submitted with supporting document

giving the schedule of Bars with sketches. In case the Owner issues the

reinforcing steel, the sectional weights shall be the same as were applied at the

time of issue. In case the steel is to be supplied by the Contractor, the sectional

Weight to be adopted shall be the I.S. Sectional Weight or as per actual which

shall be arrived by accurately measuring representative samples as directed by

the Engineer, whichever is loss.

b) Standard hooks, cranks, bends authorized laps etc. shall be measured.

c) Lap wielding or butt wielding if permitted will be measured diameter wise per

joint. The actual length of steel in lap will be measured separately in case of lap

wielding. The rate quoted for the smaller size bar will be applied in case of joint

between two bars of different diameters.

d) Separator pieces between two or more layers of steel shall be measured.

e) No payment shall be made for binding wires, spacer block, supports, chairs,

hangers etc. of height 300 mm and less, required for keeping the steel in position

unless otherwise specified in the contract. For supporting horizontal

reinforcement at height larger than 300 mm support drawings shall be prepared

48

by the Contractor and payment shall be made for the supports as approved by the

Engineer or as actually placed, whichever is loss, at the same rate as for

reinforcements.

f) No extra will be paid for modification of already embedded reinforcement, if

required due to faulty fabrication of placement.

g) Dowels neither shown on the drawings nor instructed by the Engineer, but

required for construction facilities and/or sequence, shall not be measured.

12.06.00 Formwork

a) Formwork for different types shall be measured as the actual surface in contact

with the concrete and paid on area basis unless included in the rate for concrete.

b) Formwork shall not be measured separately for precast concrete work and

concrete perforated units, which shall be included in the respective rates.

c) No payment for formwork or any other requirements in construction joints shall

be made.

d) Opening up to 0.1 Sq.M or “boxing” left for inserts etc. for facility of

Contractor’s work, shall be neglected as non-existent for the purpose of

formwork measurement.

e) No extra measurement or payment shall be made for making the formwork

waterproof or for supports, scaffolding, centering, approaches, etc.

f) No measurement shall be taken for the formwork in pockets, opening, chase etc.

in concrete if the cross-sectional are is less than or equal to 0.1 Sq.M. in each

case. If the cross-sectional area of any opening exceeds 0.1 S.M. the formwork

shall be measured under appropriate classification.

g) Fixing and removing pockets and openings of sectional area less than 0.1 Sq.M.

shall be measured on number basis and paid separately.

49

h) No separate payment shall be made for using fillets for rounding of chamfering

junctions, corners, etc.

i) Formwork, if required, for joints shown on drawings or instructed by the

Engineer shall be paid for the “leading side” only.

12.07.00 Anchor bolts, anchors, sleeves, inserts, hangers/ conduits/ pipes and other embedded

fixtures

a) Theoretical weight of embedded fixtures shall be paid by weight irrespective of

the nature and location of work. The actual weight shall be allowed under

certification of the Engineer.

b) No extra payment shall be made for cleaning of inserts, etc. required for bond in

concrete.

12.08.00 Grouting under machinery or structural steel base plates

Grouting shall be measured on theoretical volume basis, neglecting the volume of

embedded items. No extra payment shall be made if any formwork is required.

12.09.00 Water Proofing Admixtures

If supplied by the Contractor shall be measured on theoretical weight/volume required

and paid separately. No extra payment for handling and mixing shall be made if the

material is supplied by the Owner.

13.00.00 I.S CODES

The provisions of the latest revisions of all relevant I.S. codes shall form a part of this

specification to the extent they are applicable. Where the I.S Code is in conflict with the

stipulation of his specification, the I.S. Code will supersede these specifications.

50

Some of the important relevant codes for this section are:

a) IS – 383: Specification for coarse and fine aggregates from natural source for

concrete.

b) IS – 432: (All Parts) – Specification for mild steel and medium tensile bars and

hard/drawn steel wire for concrete reinforcement.

PART – I: Mild steel and medium tensile bars

PART – II: Hard drawn steel wire

c) IS - 456: Code of practice for plain and reinforced concrete for

general building construction.

d) IS – 515: Specification for the natural and manufactured aggregates

for use in mass concrete.

e) IS – 516: Method of tests for strength of concrete.

f) IS – 1139: Hot rolled mild steel and medium tensile deformed bars for

concrete reinforcement.

g) IS – 1199: Methods of sampling and analysis of concrete.

h) IS – 1200: Methods of measurement of building works.

i) IS – 1322: Specification for bitumen felts for waterproofing and damp

proofing.

j) IS – 1566: Specification for hard-drawn steel wire fabric for concrete

reinforcement.

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k) IS – 1786: Specification for cold twisted steel bars for concrete

reinforcement.

l) IS – 1834: Specification for hot-applied sealing compounds for joints

in concrete.

m) IS – 1838: Performed fillers for expansion joints in concrete non-

extruding and resilient type (Bitumen-Improghated fibre).

n) IS – 2386: Method of test for aggregates for concrete.

o) IS – 2502: Code of practice for bending and fixing of bars for concrete (8

parts) reinforcement. .

p) IS – 2571: Code of practice for laying In-Situ cement concrete

flooring.

q) IS – 269: Specification for ordinary & low heat Portland cement.

r) IS – 2751: Code of practice foe wielding of mild steel bars used for

reinforced concrete construction.

s) IS – 3067: Code of practice of general design details and preparatory

work for damp-proofing and water proofing of buildings.

t) IS – 3370 : (Part – I and II) – Code of practice for concrete structure

for the storage of liquids.

u) IS – 8041: Rapid hardening Portland cement.

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TECHNIGAL SPECIFICATION

FOR

WOODEN DOORS AND WINDOWS

53

Technical specification FOR

WOODEN DOORS AND WINDOWS 1. SCOPE

1.01 This specification covers supply and fixing of wooden doors & windows choukosh & shutters with maintenance, repair and protection until handling over the finished item as per drawing and instruction of Engineer.

2. INSTALLATION

2.01 Frames (choukosh)

Providing and fixing seasoned, dressed Sal timber frames in doors, windows clear story windows and ventilators made of specified size and section as shown in the drawing. The work shall be paid in Cu.M.

2.02 Timber

a) Quality Timber shall generally conform to IS.287-1960. Timber to be used for the work shall be from the heart entirely removed. It shall be uniform in substance, straight in fiber, free from large, loose, dead or cluster knots, flaws, shakes, wash, sup spring, twist, bends and defects of any kind, it should be free from spongy, brittle, flaky or brushy condition, sapwood and borer holes. All timber(Sal or Sesham) shall be seasoned and be free from decay, harmful fungi and insect, attacks and from any other damage of harmful nature which will affect the strength, durability, appearance or its usefulness for the purpose for which it is required. b) Kind The timber shall be best quality timber as specified in the item. The samples of the approved timber to be used shall be deposited in the office of the site Engineer for the purpose of comparison. c) Colour The colour shall be uniform as far as possible, the darkness of colour amongst colour species of timber being generally a sign of strength durability. d) Moisture content

54

The moisture content for timber shall not exceed 12% of dry weight of timber. e) Stacking As soon as the layout work of the foundation of building is complete all necessary timber, scantlings, etc. shall be brought to site and stacked as laid down in IS 401-1967 till required.

f) Procurement

Timbers for the work shall not be brought to site of work until seen and approved by the Engineer who may reject the defective timber/timber work. Any effort like plugging, painting, using and adhesives or resinous materials to hide defects shall be render the pieces rejectable by the engineer, Timber preserved for inspection shall be clean and free from dust, mud, paint or other materials, which may conceal the defects. Protection works of cut off ends can be done after inspection with raw linseed oil or any other materials approved by the Engineer. No timber shall be painted, tarred or oil primed without permission of the Engineer.

g) Sawing All scantlings shall be swan in straight lines, planes and of uniform thickness with full measurement from end to end and shall be swan in the direction of the grain. They shall be swan with such sufficient margin as to secure specified dimensioned, lines and planes after being wrought and dressed.

Any timber rejected shall be at once be removed from the site of work.

h) Construction When ventilator is provided above the door, full length of the vertical post shall be provided. Joints in the frame vertical style or horizontal rail shall not be allowed. The unrelated edges of the frame in the opening shall be rounded or uniformly.

The rebate and the plaster key grooves shall be provided as shown in the drawing. Vertical plate shall be embedded at least 30mm in the masonry or concrete or flooring. Hold fasts shall be provided as specified and any adjustment in the spacing necessary shall be erected in position and held in plumb with proper supports from both sides and built in masonry as it is being built.

The work shall be as per the drawing. The timber shall be properly planed wrought and dressed in a workmanlike manner. Joints shall be true in fit properly and as directed by the Engineer. The rate of woodwork shall include the cost of all sawing, plaining, joining, bolts, nails, spikes, keys wedges, pins, screws, etc. necessary for the framing and fixing. Joints and portions inserted in masonry or floor shall be allowed for the measurement. Plugging in of holes for hold fasts shall be done in a neat manner. Any defective timber member observed after installation shall be rejected. Sample of workmanship shall be submitted for approval.

55

I)Measurement The measurement of the timber frame shall be taken in its net end section and worked out correct upto two of decimals in cubic meter. The tolerance of 3mm is admissible in section of dressed timber.

2.03 Flat mild steel holdfasts

Providing and fixing 20x6mm flat mild steel holdfasts total 300mm long as per drawing and fixed to frames with screws, embedded in cement concrete of PCC 1:2:4 block of 300x100x100mm.

These shall be of 20x6mm long MS flat one end split fishtailed for anchorage and other bent up for fixing to the timber frame as per the drawings. Holdfasts shall be fixed to the door or window frames with 40mm screws. The MS flat of the holdfasts shall be fitted to the frame in the recess of requires size and thickness. There shall be 2 such holdfasts on each side of the frame for frames upto 1.25M height (four in all) and fixed with 3 nos. of screws on each holdfasts as shown on the drawings with minor adjustments for brick/stone masonry. It shall be fixed as the work proceeds and not later.

2.04 Round mild steel holdfasts.

Providing and fixing 12mm diameter holdfasts as shown in the drawing.

The mild steel holdfasts to be embedded in RCC columns shall be made of 12mm diameter rod fishtailed at one end and threaded at the other. The split length shall be 25mm and threading length shall be at least 5mm and a nut of 12mm diameter shall be provided. It shall be total 176mm long. The MS bolt holdfasts as shown in the drawing shall be provided in the RCC column structure at required places as the casting progresses. In absence of RCC column the MS bolt holdfasts shall be provided in a concrete block of 300x100x100.

The timber frame shall be fitted with MS bolt holdfasts through square hoes provided at required places in the frame. The nut shall then be tightened properly. Care shall be taken that the threaded bolt is at least 12mm inside exposed frame face. Plugging of the bolt hole in the frame shall be done with timber matching the graining of the timber. The finished surface shall be smooth and matching after plugging the bolt hole.

2.05 Bitumen Paint

Applying two coats of hot bitumen emulsion to the timber frames.

56

All door, window and ventilator embedded in or in contact with masonry or concrete works shall be coated with two coats of bitumen emulsion. Care shall be taken that bitumen does nor drip on the dressed faces or fare faced brick surface.

3.00 SAL TIMBER PANNELED DOOR SHUTTER

3.01 Panelled Shutter Provide and fixing in position 38mm thick Sal timber door shutter single or double leaf fixed with 3nos. of 150mm steel butt hinge to each shutter. The shutter may be paneled single or double leaf, which shall be as per drawing or the direction of the Engineer. The style shall be continuous from top to bottom. The top, frieze, munitions or mullion shall be jointed to the styles and the rails. The thickness of the styles and rails shall be 39mm and widths shall be as shown in the drawing or as directed by the Engineer. The timber panels shall be 12mm thick waterproof plywood or as instructed by the Engineer. 20mm deep groove shall be made on all the inside faces of the styles and rails to receive panels. Before fixing the panels in the grooves of styles, rails, etc. paste of movicol or fevicol shall be applied on the panel o proper adhesion.

All junctions of styles to rails or to munitions etc. shall be treated with movicol of fevicol before fixing to the shutter frame work. 3nos. of 150mm steel butt hinges shall be fixed with screws at proper places as shown on drawing or directed by the Engineer. The finished shutter shall be dressed and smoothly finished.

3.02 Constructions

The item shall be carried out in conformity with IS 1003 Part I-1966 for door shutters. Construction and workmanship finished dimension of the components being entirely as per clause there in and as shown in the drawing. When ventilator is included it shall be provided by having full-length one piece posts for door or window and ventilator extending the frame on the top to the head to the required extent. The shutters shall be of finished dimensions with ornamental moldings or as rebates in the frames and shutters by reducing the glaze. The clearance between the finished shutter and the doorframe and between the shutters themselves shall not exceed 3mm unless otherwise specified in the drawing. The fixing and size of the thickness and width of the hinge flaps in the sides of the shutter style and the doorframe.

3.03 Measurements

The measurements of the door shutter shall be taken in its net area of the full length and breadth from rebates. Tolerance in size shall be 6mm or 3mm in thickness. The rate shall include cost of materials and labor.

3.04 Window shutters

57

Providing and Fixing in position 38mm thick window clerestory and ventilator shutters made of seasoned sal timber shutter frame as per drawing, fixed with 2 numbers of 100mm butt hinges.

a) Fully paneled shutter as per drawing. It shall be paid in Sq.M. b) Partly paneled and partly glazed window shutter. It shall be paid in Sq.M. c) Fully glazed shutter including the cost of glazing. It shall be paid in Sq.m. d) Louvered shutter as per drawing. It shall be paid in Sq.M. e) Flywire mesh shutter using 24 gauge 12mm to 25mm with timber beads as per drawing.

It shall be paid in Sq.M.

The shutter and the finishing sizes of components like styles, rails mounting, etc. shall be as per drawing.

The workmanship shall be best quality finished smooth correct to size. The styles rails, etc. shall be rebated inside 12mm along the side to receive the panels, glass, wire mesh, etc. Timber panel shall be provided as described under paneled door shutters. Fly proof webbing of 12mm to 25mm shall be used of 24 gauges unless otherwise specified. The webbing shall be bent at 90 along 12mm on both side to rebate and fix securely to the styles, rails and mounting by 12mm galvanized iron staples at about 6” intervals, staggered spacing’s. Fillets shall be securely and neatly fixed with small screws spaced out at 100mm centers round the rebate for each panel of webbing wire mesh. The wire mesh shall be tightly stretched during fixing. The space between the fillet and the rebate where the webbing is bent shall be neatly finished with putty, so that cut end of webbing may not be visible. Sample of workmanship shall be approved prior to execution of work.

Measurement : It shall be measured in Sq. M. of the shutters including hinges. Tolerance in size shall be 6mm and 3mm in thickness. The rate shall include cost of materials and labor complete. Nothing extra shall be paid for double leaf shutter overlap, etc.

3.05 Glazing

Providing and fixing glass in door, clerestory, window, ventilator shutter with putty or putty and timber bead as shown in drawing.

a) Clear glass 4mm thick b) Clear glass 6mm thick c) Wired glass 6mm thick d) Frosted glass 4mm thick

3.06 Material

Putty shall be glazing putty in sealed tins. The glass of specified thickness and type shall be provided of approved make and shade. The glass shall be free from shacks, bubbles, air holes, vein blisters or any other defects. It shall be of uniform thickness. Samples shall be approved prior to use.

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3.07 Workmanship

All windows shall have glazing fixed on outside face or as shown on the drawings with wooden beads and putty. The glass shall be cut to size to fit slightly loose. The beads shall be of sal timber as shown in the drawing. First a thin layer of putty is pressed along the rebate then the glass is pressed over which another layer of putty is laid and then wooden bead pressed and fixed with panel pins. The panel pin shall be spaced not more than 500mm apart.

3.08 Measurement

It shall be measured in Sq. M. of the glass provided inclusive of rubber channel, wooden beads and putty. The rate shall include for providing rubber channel, putty, wooden beads, glass, panel pins, etc. and labor complete.

3.09 Aluminum sheet fixing to shutter

Providing and fixing 18 gauge aluminum sheet in door shutter as per drawing . It shall be paid in Sq. m.

The shutter shall be made as per the relevant item and specification. The aluminium sheet shall be fixed on the shutter with anodized screws of 25mm long. The aluminium sheet shall be specified thickness. The sheet shall be fixed neatly.

Measurement : It shall be measured for provided size only. Rate shall include for providing sheets, screws and labor complete.

4.00 FIXTURES AND FITTINGS

Providing and fixing in position fixtures and fastening in the door, window, clerestory window and ventilator shutters as per specification and drawings.

All fixtures and fastenings to be used shall be approved by the Engineer and shall be fixed as per drawing. They shall be new, tough and strong of best quality and workmanship. The size shape, design and finish shall be shown on drawings or directed by the Engineer. Samples hall be submitted for approval to the Engineer and they shall be kept safely for comparison while fixing these fixtures at place.

All fixtures shall be fixed at the joinery in a secure and efficient manner. Any of the fixtures damaged during fixing shall be removed and new ones fixed in their place and the surface of the joinery made good where affected at the Contractor’s expenses. When the type is not mentioned on the drawing or items, it shall be as directed by the Engineer. The fastening and fixtures shall be provided as per the fastening and fixture schedule. A pair of 230mm long hook and eye shall be fixed to the ventilator frame and the shutter as directed. If the drawings specify different types of fixtures the work shall be carried out according to drawing.

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If the ventilator is swing type then hooks and eyes can be dispensed with. The ventilator shall swing about a central horizontal axis on a pair of such center, chat hook, one brass ring with screws attached as per drawings or as directed by the Engineer and a good quality of window hemp cord of adequate length for convenient operation of the ventilator shall be provided. A two prolonged brass hook shall be embedded in the wall at the height above floor level for trying the cord. All the fixtures shall be fixed as shown on the drawings or as directed by the Engineer. The fixtures and fastenings shall be fitted prior to the application of finishes, removed during the finishing operation and reset after completion of the finish. Metal knobs and handles shall be protected by the wrappers of the tough paper or cloth and maintained in place till acceptance if the work. Upon completion of the work, the Contractor shall in the presence of the Engineer show that all the fixtures and fastening work freely and properly.

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FOR

GLASS AND GLAZING

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GLASS AND GLAZING

1.00.01.1 SCOPE

The work in general shall consist of supplying and fixing all glass and glazing including all clips, putty, mastic cement etc. wherever required as shown on drawings and specifications.

2.00.00 INSTALLATION

2.01.00 GENERAL

The contractor shall supply and install all glass and glazing as required for various doors, windows, sashes, ventilators and fixed louvers , miscellaneous glazing and partitions, unless otherwise stated in the drawings or schedule. All glass shall be of superior quality from approved manufacturer like Hindustan, Pilkinton, or equivalent, having uniform refractive index and free from flaws, specks and bubbles. The glass shall be brought to site in the original packing from the manufacturer and cut to size at site. The cut edges shall be straight and free from chips, spells or any other damages.

2.02.00 Materials

a) Glare reducing or heat absorbing glass shall be ‘oalorex’ of Hindustan Pilkinton or approved equivalent and special care shall be taken to grind smooth and round off the edges before fixing.

b) Clear glass be flat drawn sheet, glass and shall be at least 4 mm thick. Shoot glass for doors shall be minimum 5.5 mm thick.

c) Wired glass shall be thick rolled glass with centrally embedded 24 g wire mosh or Georgian type. This may be of clear or coloured glass, as shown in drawings or schedules.

d) Obscure glass shall have a cast surface on one side.

e) Coloured and figured glass shall be as per approved sample.

f) In general, the putty shall conform to IOS : 410 and be of best quality from approved manufacturer. It shall be brought to site in the manufacturer’s original packing. Quick setting putty shall be used for windows and sashes except when glare reducing glass is used where it shall be of non-setting type.

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g) Neoprene gaskets with snap-fit glazing beads shall be fixed as per manufacturer’s instructions and shall sit anugly against glass to give a leak-proof installation.

2.03.00 Glazing, Setting and Finish

All glazing clips, bolts, putty, astic cement etc. as required shall be supplied by the Contractor.

All glass shall be thoroughly cleaned before putting in position. Each glass pane shall be held in place by special glazing clips of approved type. As specified in relevant I.S. Codes, four glazing clips shall be provided per glass panel, except for the large panel where six or more clips shall be used as per Engineer’s instructions. All holes that may be necessary for bolding the clips, glazing beads and all other attachments shall be drilled by the Contractor.

Glass panes shall be set without springing and shall be beded in putty and back putied, except where mouldings or gaskets are specified. Putty mastic cement etc. shall be smoothly finished to a true even line. Obscure and figured glass shall be set with smooth side out.

Where glass will be supplied by the Owner, the Contractor cut it to size and fix them in the same way as specified above.

Necessary glazing clips, putty, mastic cement etc. shall be supplied by the Contractor. The Contractor shall be responsible for damage of glass supplied by the Owner, during handling transportation, fixing etc. Maximum wastage allowance shall be 5%.

After completion of glazing work, the Contractor shall remove all dirt, stains excess pitty etc. clean the glass panes and leave the work perfectly acceptable condition. All broken cracked or damaged glass shall be replaced by new ones at the Contractor’s own cost.

3.00.0 ACCEPTANCE CRITERIA

a) All installation shall be free from cracked, broken or damaged glass. Edges of large Panes of thicker glass and heat absorbine glass shall be inspected carefully for chipped, cracked or unground edges.

b) Glazing shall be carefully done to avoid direct contact with metal frames. c) All glass shall be embedded in mastic or fixed by neoprene gaskets to give a leak - Proof installation.

d) At completion the panes shall be free from dirt, stains, excess putty etc. to the complete satisfaction of the Engineer.

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4.00.0 RATES

a) Rates shall be unit rates for supply and/or installation of different kinds of glass –mentioned in the Schedule of Items.

b) No separate payment shall be made for glazing clips, mastic cement, putty, nails etc. nor

for drilling holes in frames for inserting glazing clips.

c) No separate payment shall be made for cutting of glass to required size, edge finishing etc. if the glass is supplied by the Contractor.

d) Payment shall be made for cutting of glass to required sizes, edge finishing etc. if the

glass is supplied by the Owner.

e) No separate payment shall be made for cleaning the glass after installation.


a) All supply and/or installation of glass shall be measured for actual area of work done.

b) When glass is supplied by the Owner the cutting of glass shall be measured for actual

length of cut edges

6.00.00 I.S. CODES

Following are important IS codes relevant to this section:

IS : 1081 – Code of practice for fixing and glazing metal doors, windows and ventilators.

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FOR

FINISH TO MASONRY AND CONCRETE

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FOR

FINISH TO MASONRY AND CONCRETE

1.00.0 SCOPE

This specification covers furnishing, installation, repairing, finishing, curing, testing, protection, maintenance till handing over of finishing items for masonry and concrete.

Before commencing finishing items the contractor shall obtain the approval of the Engineer regarding the scheduling of work to minimize damage by other trades. He shall also undertake normal precaution to prevent damage or disfiguration to work of other trades or other installations.


2.01.00 Preparation of Surface

All joints in masonry walls shall be raked out to a depth of at least 10mm with hooked tool made for the purpose while the mortar is still green. Walls shall be brushed down with stiff wire brush to remove all loose dust from joints and thoroughly washed with water. All laitance shall be removed from concrete to be plastered.

For all types of flooring, skirting and dado work, the base cement concrete floor masonry surface shall be roughened by chipping and cleaned of all dirt. Grease or loose particles by hard brush and water. The surface shall be thoroughly moist to prevent absorption of water from the baser course. Any excess of water shall be mopped up.

At any point, the level of base shall be lower than the theoretical finished floor level by the thickness of floor finish. Any chipping or filling to be done to bring the base to the required level shall be brought to the notice of the Engineer and his approval shall be taken regarding the method and extent of rectification work required.

Prior to commencement of actual finishing work, the approval of the Engineer shall be taken as to the acceptability of the base.

2.02.01 Mortar

Mortar for plastering shall be as specified in the Schedule of Items.

For sand cement plaster, sand and cement in the specified proportion shall be mixed on water tight platform and minimum water added to achieve working consistency.

For lime gauged plaster, lime putty or hydrated lime and sand in required proportion shall be mixed on a watertight platform with necessary addition of water and thoroughly ground in mortar mill. This mix shall then be transferred to a mechanical mixer to which the required quantity of cement is added and

mixed for at least 3 mins.

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No mortar which has stood for more than half an hour shall be used; mortar that shows tendency to become dry before this time shall have water added to it.

2.02.02 Application of Plaster

Plaster, when more than 12mm thick, shall be applied in two coats a base coat followed by the finishing coat. Thickness of the base coat shall be sufficient to fill up all unevenness in the surface, no single coat, however, shall exceed 12mm in thickness. The lower coat shall be thicker than the upper coat. The overall thickness of the coats shall not be less than the minimum thickness shown on the drawings. The undercoats shall be allowed to dry and shrink before applying the second coat of plaster. The undercoat shall be scratched or roughened before it is fully hardened to form a mechanical key. This method of application shall be ‘thrown on’ rather than ‘applied by trowel’.

To ensure even thickness and true surface, patches of true plaster about 100mm to 150mm square or wooden screed 75mm wide and of the thickness of the plaster, shall be fixed vertically about 2000mm to 3000mm apart to act as gauges. The finished wall surface shall be true to plumb, and the Contractor shall, without any extra cost to the Owner, make up any irregularity in the brick work with plaster. All vertical edges of brick pillar, door jambs etc. shall be chamfered or rounded off as directed by the Engineer. All drips grooves, mouldings and cornices as shown on drawings or instructed by the Engineer shall be done with special care to maintain true lines, level and profiles. After the plastering work is completed all debris shall be removed and the area left clean.

Lime Plaster Washing

Lime plaster washing is made of hydrated lime mixed with fine sand in ratio 1:1 and water added to a soft porridge. The plaster is applied in thin layer of 3-5mm on the wetted wall by a wooden or steel trowel, preferable 15cm x 45cm. After few minutes of setting a wooden trowel, covered with thick filth or carpet, dipped in water, washes the wall in rotating movements to remove all plaster surpluses. The total size should be 12cm x 18cm (5” x 7”). The finished surface stands as a lime coloured wall with some stones peeping through.

Any plastering that is damaged shall be repaired and left in good condition at the completion of the job.

2.02.03 Finish

Generally, the standard finish shall be used unless otherwise shown on the drawing or directed by the Engineer. Wherever any special treatment to the plastered surface is indicated, the work shall be done exactly as shown on the drawings, to the entire satisfaction of the Engineer regarding the texture, colour and finish.

a) Standard Finish Wherever punning is indicated, the interior plaster shall generally be finished to a smooth surface. The exterior surface shall generally be finished with a wooden float.

b) Neat Cement Finish Immediately after achieving a true plastered surface with the help of a wooden straight edge, the entire area shall be uniformly treated with a paste of neat cement at the rate of 1 Kg. per Sq. M. and rubbed smooth with a trowel and cost of which shall be inclusive in the rate of plaster.

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2.02.04 Curing

All plastered surfaces after laying, shall be watered, for a minimum period of seven days, by an approved method, and shall be protected from excessive heat and commence, as soon as the plaster has been hardened sufficiently and not susceptible to damage. Each individual coat of plaster shall be kept damp continuously, for at least two days, and then dried thoroughly, before applying the next coat.

2.03.00 Painting to Masonry

All joints of brick work shall be raked out to a depth of 10mm with a hooked tool made for the purpose while the mortar is still green. The brick work shall then be brushed down with a stiff wire brush, so as to remove all loose dust from the joints and thoroughly washed with water. Mortar consisting of 1 part cement and 3 parts clean, sharp, well graded sand by volume shall be presses carefully into the joints and finishes with suitable tools to shape as shown on the drawings. Any surplus mortar shall be scraped off the wall face leaving the surface clean.

The painted surface shall be kept wet for at least three days for curing.

2.04.00 Stone Facing

Stone facing where specified shall be done as shown on design drawings and approved working drawings. The stone shall be specified on drawings and/or schedule of items. Samples of stone shall be submitted to the Engineer for approval and then bulk purchase made. The Contractor shall submit three copies of working drawing for the Engineers’ approval before commencing the work.

The thickness of facing stone shall be not less than 25mm unless otherwise specified on drawings.

The stone slabs shall be cut and finished to sizes as per pattern shown on drawings. They shall be fastened to wall with suitable non-corrodible anchorage as approved by the Engineer. Where mild steel clamps, stays etc. are used for anchorage, they shall be galvanized (weight of zinc coating shall not be less than 700gms per square meter of surface) to prevent rust stains developing on the finished surface. There shall be at least 12mm gap between the stone and masonry, which shall be filled up and packed by a mortar of 1 part cement and 3 parts of sand by volume. After the mortar is set and cured for at least four days, the exposed surface shall be neat, of uniform texture and acceptable to the Engineer.

Where painting is specified on drawings it shall be done by mortar as specified on drawings and/or schedule of items


Finish to masonry and concrete shall fully comply with the drawings, specifications, approved samples and instructions of the Engineer with respect to lines, levels, thickness, colour, texture, pattern and any other special criteria as mentioned in the body of the specification or as shown on drawings.

4.00.00 RATES

Rates shall be for the complete work as detailed out in the specification unless any particular portion is specifically excluded in the schedule of Items.

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a) All surface finish shall be measured on actual areas laid. No deductions shall be made for openings, pipes, sleeves etc. upto 0.1 Sq. M. in area.

b) Unless separate item is provided for special corner or edge finish, drip course, grooves, mouldings, curbs etc. these shall not be measured separately. Where separate items are provided in the schedule of Items, such work shall be measure in length.

c) No separate payment shall be made for finishing round openings, sleeves, pipes etc. No separate payment shall be made for formwork, templates etc. required for achieving true lines and profiles as shown on drawing.

d) Finished applied integrally with walls, floors, steps and ceilings shall be measured separately and paid under relevant items.

6.00.00 I.S. CODE

Important relevant code for this section:

a) I.S. 1661 - Code or practice for cement and cement-lime plaster finish on walls and ceilings. b) I.S. 4101 - Code of practice for external facing and veeners.

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FOR

FLOOR FINISHES AND ALLIED WORKS

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FOR

FLOOR FINISHES AND ALLIED WORKS

1.00.00 SCOPE

This specification covers furnishing, installation, finishing, curing, testing, protection, maintenance till handing over the various types of floor finishes and allies=d items of works as listed below:-

1.01.0 In situ finishes: i) Integral finish to concrete base. ii) Terrazzo finish iii) Patent stone and hogh burnt clay tiles iv) Metallic hardware like “Ironite” finish

1.02.0 Tiled finishes: i) Terrazzo tile

1.03.0 Base

The base to receive the finish is covered under other relevant specification.

1.04.00 Sequence

Commencement, scheduling and sequence of the finishing works shall be planned in detail and must be specifically approved b y the Engineer keeping in view the activities of other agencies working in the area. However, the Contractor for the finishing items shall remain fully responsible foa all normal precautions and vigilance to prevent any damage whatsoever till handing over.


2.00.01 Special Materials

Special materials required for individual finishing items are specified under respective items. In general, all such materials shall be as per relevant I.S. Codes where available. In all cases these materials shall be of the best quality available indigenously unless specified otherwise,

The materials for finishing items must be procured from well reputed specialized manufactures and on the basis of approval of samples by the Engineer. The materials shall be ordered, procured and stored well in advance to avoid compulsion to use sub-standard items to maintain the construction schedule.

2.00.02 Workmanship

Only workers especially experienced particular items of finishing work shall be engaged. Where such workers are not readily available, with the Engineer’s permission, experienced supervisors recommended by the manufacturer shall be engaged. In particular case, where the Engineer so desires the Contractor shall get the finishing items installed by the manufacturer.

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2.00.03 Preparation of the base surface

The surface to be treated shall be thoroughly examined by the Contractor. Any rectification necessary shall be brought to the notice of the Engineer and his approval shall be taken regarding method and extent of such rectification method.

For all types of flooring, skirting, dado and similar locations, the base to receive the finish shall be adequately roughened by chipping, raking out joints and cleaning thoroughly all dirts, grease etc. with water, hand brush and detergent, if required, unless otherwise directed by the manufacturer of any special finishing materials, or specifically indicated in this specification under individual item.

To prevent absorption of water from the finishing treatment, the base shall be thoroughly soaked with water and all excess water mopped up.

The surface shall be done dry where adhesives are used for fixing the finishes.

Prior to commencement of actual finishing work the approval of the Engineer shall be taken as to the acceptability of the surface.

Cavity flooring

Cavity flooring shall be done by flagstones placed in rows for approximately 30cm according to size of stones and in 5 layers of courses of approximately 5cm each. The layers are crossing and staggered to the layer below and a sixth layer on top is executed as soling covering the total floor area, The single flagstone is placed in cement mortar to balance and stabilize the stacking.

The soling shall be covered with polythene sheets and act as a permanent formwork for the P.C.C. flooring.

2.01.00 In Situ Finishes

2.01.01 integral Finish to Concrete Base

While the surface of the concrete laid as per specification for ‘Cement Concrete’ has been fully compacted and leveled but the concrete is still ‘Green’, a thick slurry made with neat cement shall be applied evenly and worked in with iron floats. When the slurry starts to set, it shall be pressed with iron floats to have a firm compact smooth surface without any trowel mark or undulations. This finish shall be as thin as possible by using 2.2 kg of cement per Sq. M. of area. The surface shall be kept in shade for 24hours and then cured for at least 7 days continuously by flooding with water. The surface shall not be subjected to any load or abrasion till 21 days after laying.

As desired by the Engineer the surface, while still in ‘green’ shall be indented by pressing strings. The markings shall be of even depth, in straight lines and the panels shall be of uniform and symmetrical patterns.

2.01.02 Terrazzo Finish: In Situ

I t shall consist of an underbed and a topping laid over an already laid and matured concrete base.

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a) Thickness Unless otherwise specified total thickness of the finish shall be minimum 45mm for horizontal and 25mm for vertical surface of which the topping shall not be less than 10mm. while the topping shall be of uniform thickness the underbed may vary in thickness to provide necessary slopes. The vertical surface shall project out 6mm from the adjacent plaster or other finishes. Necessary cutting into the surface receiving the finish shall be done to accommodate the specified thickness.

b) Mix i) Underbed

The underbed for floors and similar horizontal surfaces shall consist of a mix of 1 part cement, 1.5 parts sand and 5 parts stone chips by volume. For vertical surfaces the mix shall consist of 1 part cement to 3 parts sand by volume. The sand shall be coarse. The stone chips shall be 10mm down wall graded. Only sufficient water to be added to give a workable consistency.

ii) Topping The mix for the topping shall be composed of cement, colour pigment, marble dust and marble chips. Proportion of the ingredients shall be such as to produce the terrazzo of colour, texture and pattern approved by the Engineer. The cement shall be white or grey or a mixture of the two to which pigment shall be added to achieve the desired color. To 3 parts of this mixture, 1 part of marble chips by volume shall be added and thoroughly mixed dry again. The pigment must be stable and non fading. It must be very finely ground. The marble powder shall be from white marble and shall be finer than I.S. Sieve no. 30. The size of marble chips may be between 1mm to 20mm. Sufficient quantity to cover each visible area shall be prepared in one lot to ensure uniform color. Water to make it just workable shall be added to a quantity that can be used up immediately before it starts to set.

c) Laying The underbed shall be laid in panels. The panels shall not be more than 5 Sq. M. in area of which no side shall be more than 2.5M long. For exposed locations the maximum area of a panel shall be 2.0 Sq. m. The panels shall be laid in alternative bays or chequered board pattern. No panel shall be cast in contact with another already laid until the later has contracted to the full extent. Dividing strips made of aluminium or glass shall be used for forming the panels. The strips shall exactly match the total depth of underbed plus topping. After laying, the underbed shall be leveled compacted and brought to proper grade with a screed or float. The topping shall be laid after about 24 hours while the underbed is still somewhat ‘Green’ but firm enough to receive the topping. Slurry of the mixture of cement and pigment already made shall be spread evenly and brushed in just before laying the topping. The topping shall be rolled for horizontal areas and thrown and pressed for vertical areas to achieve a compact dense mass fully bonded with the underbed. The surface of the topping shall be trowelled over pressed and brought to a smooth dense surface showing a minimum 75% area covered by marble chips in an even pattern of distribution.

d) Curing

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The surface shall be left for curing for about 12 to 18 hours and then cured by allowing water to stand on the surface or by covering with wet sack for four days.

e) Grinding and Polishing When the surface has sufficiently hardened it shall be watered and ground evenly with rapid cutting coarse grade (No. 60) grit blocks till the marble chips are exposed and the surface is smooth. Then the surface shall be thoroughly washed and cleaned. A grout with already prepared mixture of cement and pigment shall be applied to fill up all pin holes. This surface shall be cured for 7 days keeping it moist and then ground with fine girt blocks (No. 120). It shall again be cleaned with water, the slurry applied again to fill up and pin hole that might have appeared and allowed to be cured again for five days. Finally the surface is ground a third time with every fine grit blocks (No. 320) to get smooth surface without any pin hole. The grinding shall be done by a suitable machine. Where grinding machine cannot be used, hand grinding may be allowed when the first rubbing shall be with carborundum stone of coarse grade (No. 80) and final rubbing and polishing with fine grade (No. 120). The surface shall be cleaned with water, dried and covered with oil free clean saw dust if directed by the Engineer. The final polishing shall be postponed till before handing over if desired by the Engineer. Just before handing over the surface shall be dusted with oxalic acid at eh rate of 0.33 gm per Sq. m. water sprinkled on to it and finished by buffing with felt or hessian bobs. The floor shall be cleaned with soft moist rag and dried. If desired by the Engineer, wax polish to be applied. However, all excess wax polish to be wiped off and the surface to be left glossy but not slippery.

2.01.03 Patent Stone & High burnt clay tiles.

It shall consist of an underbed and a topping laid on an already laid and matured concrete base.

a) Thickness The patent stone and high burnt clay tiles finish shall have thickness as stipulated under Clause 2.0102 (a) except that the topping shall be 6mm thick.

b) Mix i) Underbed

The mix shall be as stipulated under Clause 2.01.02 (b).

ii) Topping The mix for the topping shall consist of 1 part cement and 1 part fine sand by volume.

c) Laying The patent stone finish, including the underbed shall be laid in alternate bays or in chequered board pattern. No panel shall be cast in contact with another already laid till the contraction of the latter has already taken place. The maximum area of each panel shall be 3 Sq. M. of which no side shall be more than 2 M long. A cement grout shall be applied and worked into the surface to receive the finish, the underbed then laid, compacted and leveled to proper grade with a screed or float. The topping shall be applied evenly on the underbed while it is not fully set but firm enough and rolled and pressed to

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get full bond. The topping shall be trowelled to a dense finish to the satisfaction of the Engineer. All trowel marks shall be mopped out with a soft cloth to give a clean smooth surface. After the surface is sufficiently set, the finished floor shall be kept moist for 7 days for curing. If desired the finish shall be polished as directed by the Engineer.

2.01.04 Metallic Hardener like ‘ironite’ finish

This will consist of a topping (incorporating iron particles) to bond with concrete base while the later is ‘Green’.

a) Thickness Unless otherwise specified the metallic hardener finish shall be of 40mm depth.

b) Material The hardening compound shall be uniformly graded iron particles, free from non-ferrous metal impurities, oil grease, sand soluble alkaline compounds or other injurious materials. When desired by the Engineer, actual samples shall be tested.

c) Mix Proportion of the metallic hardener shall be specified or as indicated by the manufacturer. However, in absence of any such direction, 1 part metallic hardener shall be mixed dry with 3 parts cement, by weight. To this mixture 6mm nominal size stone chips shall be added in proportion of 1 part cement (mixed with hardener) to 2 parts of stone chips by volume and uniformly mixed. Minimum quantity of water shall be added to make it workable.

d) Laying The concrete floor shall be laid as per specification ‘Cement concrete’ and leveled up to the required grade. The forms, if any shall remain sufficiently projecting to take the finish. The surface shall be roughened by wire brush as soon as possible. The finish shall be laid while the concrete underbed is still very ‘Green’ within about 4 fours of laying of the latter. The finish shall be of uniform thickness and even dense surface without trowel marks, pin holes etc. This topping layer shall be pressed firmly and worked vigorously and quickly to secure full bond with the concrete base. Just when the initial set starts the surface shall be finished smoothened with steel trowel. The finished floor shall be cured for 7 days by keeping it wet.

2.02.00 Tiled Finish

These shall include finish tiles, stone slabs and similar manufacturer natural items over already laid and matured base of concrete o masonry by means of an underbed or an adhesive layer.

2.02.01 Terrazzo Tile Finish

The finish will consist of manufacturer terrazzo tile and an underbed.

a) Thickness The total thickness including the underbed shall be minimum 40mm for floors and 30mm for walls unless otherwise specified.

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The skirting, dado and similar vertical surfaces shall project out 6mm uniformly from the adjacent plaster or other wall finishes. The necessary cutting into the surface receiving the tiled finish, to accommodate the specified thickness shall be done.

b) Tiles : Terrazzo The tile shall bear on its back permanent legible trade mark of the manufacturer. All angles of the tiles shall be right angles, sharp and true, color and texture of wearing face uniform throughout. Maximum tolerance allowed in length and breadth shall be 1mm and the thickness +3mm. Face of the tile shall be plane, free from pin holes and other blemished. The tiles shall be composed of a backing and topping. The topping shall be of uniform thickness not less than 10mm. The total thickness including the topping shall be as specified but not less than 20mm in any case. The backing shall be composed of 1 part ordinary grey cement and 3 parts of stone chips by weight mixed with water. The topping shall be as specified under C1. 2.01.02 (b). The tile shall be cured at the shop for at least 14 days before delivery to the site. First grinding shall be given to the tiles at the shop before delivery. Tiles shall be paced properly to prevent damage during transit and storage. The tiles must be stored carefully to prevent staining by damp, rust, oil and grease, or other chemicals. Tiles made in each batch shall be kept and used separately so that color of each area of the floor may remain uniform. The manufacturer shall supply along with the tiles the grout mix containing cement and pigment in exact proportions as used in topping of the tiles. The containers for the grout mix shall be suitable marked to relate it to the particular type and batch of tiles.

c) Mix – underbed The underbed for floor and similar horizontal surfaces shall be 1 part lime putty: 1 part surkhi: 2 parts coarse sand by weight mixed with sufficient water to form a stiff workable mass. For skirting and dado and all vertical surfaces it shall be about 10mm thick and composed of 1 part cement and 3 parts coarse sand by weight.

d) Laying The underbed mortar shall be evenly spread and brought to paper grade and consolidated to a smooth surface. The surface shall be roughened for better bond. Before the underbed had time to set and while it is still fairly moist but firm cement shall be hand dusted over it or a cement slurry applied and the tiles shall immediately be placed upon and firmly pressed by wooden mallet on to the underbed until it achieves the desired level. The tiles shall be kept soaked for about 10 minutes just before laying. The joints between tiles shall be as close as possible and not more than 1.5mm wide. Special care shall be taken to check the level of the surface and the lines of the joints frequently so that they are perfect. When tiles are required to be cut to match the dimensions these shall be sawn and edges rubbed smooth. The location of out tiles shall be planned in advance and approval of the Engineer taken. At the junction of horizontal surface with vertical surface the tiles on the former shall enter at least 12mm under the latter. After fixing, the floor shall be kept moist and allowed to mature undisturbed for 7 days. Heavy traffic shall not be allowed.

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If desired, dividing strips as specified under C1. 2.01.02(c) may be used for dividing the work into suitable panels.

e) Grinding and Polishing Procedure shall be same as C1. 2.01.02. Only grinding shall not be commence earlier than 14 days after laying of tiles.


The finish shall be checked specially for:-

a. Level, slope, plumb as the case may be. b. Pattern and symmetry. c. Alignment of joints, dividing strips etc. d. Color, texture. e. Surface finish. f. Thickness of joints. g. Details of edges, junctions etc. h. Performance. i. Precautions specified for durability.

4.00.00 RATES

Rates shall be for the complete finishing work including necessary forms, underbed, sticker and preparation of the surface including cutting and chipping to receive the finish but exclusive of the base unless specially included in the Contract.

The dividing strips in case of in situ terrazzo finish shall be included in the rates. Similarly indentations, laying in desired patterns and in panels shall be inclusive in the rates.

All necessary cutting tiles, slabs etc cost of specials if any shall be included in rates. No extra shall be paid for rounding corners and edges. Unless specifically mentioned otherwise, same ratios will apply to floor, skirting, dado, nosing, etc.

5.00.00 METHODS OF MEASUREMENT

The finished surface shall be measured for area. Any opening less than 0.1 Sq. M. (and 0.05 Sq. M. in case of marble finish only) shall not be taken into accounts neither any extra shall be paid for it.

For terrazzo finish, either in situ and tiles shall be pad at the same rate unless mentioned separately in the Schedule of Items.

Except in case of in situ terrazzo finish and unless mentioned in the Schedule, dividing strips shall be measured in length.

6.00.00 I.S. CODES

Important relevant codes for this section:

IS 1196 – Code of practice for laying bitumen mastic flooring.

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IS 1237 – Cement concrete flooring tiles.

IS 1443 – Code of practice for laying and finishing of cement concrete flooring tiles.

IS 2114 – Code of practice for laying in situ terrazzo floor.

IS 2571 – Code of practice for laying in situ concrete flooring.

7.00.00 Unless specifically mentioned in B.O.Q., the rates of all floor finishes and allied works shall be inclusive of underbed and topping coarses executed as stipulated in specification.

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FOR

PAINTING, WHITE WASHING, POLISHING, ETC

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FOR

PAINTING, WHITE WASHING, POLISHING, ETC

1.00.00 SCOPE

This specification covers painting, polishing, etc. of both interior and exterior surfaces of masonry, concrete plastering, false ceiling, structural and other miscellaneous steel items, rain water down comer, floor and roof drains, soil, waste and service water pipes and other ferrous as well as non-ferrous metal items as shown on drawings or as directed by the Engineer.

If surface to be finished can not be put in suitable condition for painting by customary preparatory methods, the contractor shall notify the Engineer inwriting or assume responsibility for all rectification and unsatisfactory finishing that results.

Before commencing painting, the contractor shall obtain the approval of the Engineer in writing regarding the scheduling of work to minimize damage, disfiguration or staining by other trades. He shall also undertake normal precautions to prevent damage, disfiguration or staining to work of other trades or other installations.

2.00.00 INSTALLAQTION

2.01.00 Materials

Materials shall be highest grade products of well known approved manufacturer and shall be delivered to the site in original sealed containers, bearing brand name, manufacturer’s name and colour shade, with labels intact and seals unbroken. All materials shall be subject to inspection, approval by the Engineer. It is desired that materials of one manufacturer only shall be used as far as possible and paint of one shade be obtained from the same manufacturing batch. All paint shall be subjected to analysis from random samples taken at site from painters bucket, if so desired by the Engineer.

All prime coats shall be compatible to the material of the surface to be finished as well as to the finishing coats to be applied.

All specified materials such as shellac, turpentine or linseed oil shall be of the highest quality available and shall, conform to the latest I.S. standards. All such materials shall be made by reputable recognized manufacturers and shall be approved by the Engineer.

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All colours shall be as per painting schedule and tinting and matching shall be done to the satisfaction of the Engineer. In such cases, where sampled are required, they shall be eccicuted in advance with specified materials for the approved of the Engineer.

2.01.01 White Washing

Shall be done from pure shall lime or fat lime, or a mixture of both as instructed by the Engineer and shall conform to IS : 712 latest edition. Samples of lime shall be submitted to the Engineer for approval and lime as per approved sample shall be brought to site in unslaked condition. After slaking, it shall be allowed to remain in unslaked condition. After slaking, it shall be allowed to remain in a tank of water for two days and then strirred up with a pole. Until it attains the consistency of thin cream. 100 grams of gum to 6 litres of white wash water and a little quantity of indigo or synthetic ultramarine blue shall be added to the lime.

2.01.02 water-proof cement paint

Shall be made from best quality white cement add lime resistant colours with accelerations, water proofing agents and fungicides. The paint shall conform to IS : 5410.

2.01.03 Synthetic Enamel Paint

Shal be made from synthetic resins and drying oil with rutiletitanius dioxide and other selected pigments to give a smooth, hard, durable and glossy finish to all exterior surfaces. White and pastel shade shall resist yelloying and darkening with ageing. The paint shall conform IS : 2932 and IS : 2933.

2.02.00 Storage

The contractor shall arrange for safe and proper storage of all materials and tools. Paints shall be kept covered at all times aqnd mixing shall be done in suitable containers. All necessary precaution shall be taken by the contractor to prevent fire.

2.03.00 Preparation of Surface

Before starting the work the contractor shall obtain the approval of the Engineer regarding the soundness and readiness of the surface to be painted on.

2.03.01 Masonry, Concrete and Plastered Surface

Surface shall be free from all oil, grease efflorescence, mildew, loose paint or other foreign and loose materials. Masonry cracks shall be cleaned out and patch filled with mortar similar to the original surface and uniformly textured. Where this type of resurfacing may lead to the finishing paint being different in shade from the original surface, the resurfaced area shall be treated with minimum one coat of cement primer which should be continued to the surrounding area from a distance of minimum 100 mm.

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Surface with mildew or efflorescence shall be treated as below :

a) Mildew

all mildewed surface shall be treated with an approved fungicide such as ammonia cal wash consisting of 7 gm., of copper carbonate dissolved in 80 ml liquer ammonia and diluted to 1 litre with water, or 2.5 per cent magnesium silicofluoride solution and allowed to dry thoroughly before paint is applied.

b) Efflorescence

All efflorescence shall be removed by scrubbing affected surface with a

solution of muriatic acid in water (1:6 to !:8) and washed fully with clear and allowed to dry thoroughly.

2.03.02 Metal

All metal surface shall be absolutely clean, dry and free from was, grease or dried soap films. All steel and iron surface in addition shall be free from rust. All galvanized iron surface shall be pretreated with a compatible primer according to the manufacturer’s direction. Any abrasion in shop coat shall be touched up with the same quality of paint as the original coat.

2.04.00 Application

2.04.01 General

The method of application shall be as recommended by the manufacturer. In case of selection of special shades and colour (not available in standard shades) the contractor shall mix different shades and prepare test panels of minimum size 1 meter square as per instruction of the Engineer and obtain his approval prior to application of finishing paint.

Proper tools and implements shall be used. Scaffoldings if used shall be independent of the surface to be painted to avoid shade differences of the freshly repaired anchor holes.

Painting shall be done by skilled labours in an workmanlike manner. All materials shall be evenly applied, so as to be free of sags, runs, crawls or other defects. All coats shall be of proper consistency. In case of application by brush, no brush marks shall be visible. The brushes shall be clean and in good condition before application of paint.

All priming undercoats for painting shall be applied by brush only and rollers , spray equipments etc. shall not be used.

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No work shall be done under conditions that are unsuitable for production of good results. No painting shall be done when plastering is in progress or is drying. Application of paint which seals the surface to moisture shall onlu be done after the moisture on and below the surface has dried out.

All coats shall be thoroughly dry before being sand papered or before the succeeding coat is applied. Coats of painting as specified are intended to cover surface.

Perfectly. in case the surface is not covered properly by applying the specifying number of coats, further coats shall be applied by the Contractor when so directed by the Engineer.

All primers and undercoats shall be tinted to approximate the colour of the finishing coats. Finished coats shall be of exact colour and shade as per approved samples and all finish shall be uniform in colour and texture. All parts of moulding and ornaments shall be left clean and true to finish.

2.04.02 White Washing

The surface where white washing is to be applied shall be cleaned of all loose materials and dirt. All holes and irregularities of the surface shall be filled up with lime putty and shall be allowed to dry up before application of the lime solution. One coat of white wash shall consist of one stroke from top downwards, another from bottom upwards over the first stroke and another from left to right before the previous one dries up. Second coat shall be applied after the first coat dries up completely and similarly third coat shall be applied and in case the Engineer feels that one or more coats are required the Contractor shall do so without any extra coat to the Owner. No brush marks shall show on the finished surface. The inner plastered surfaces of walls shall be given 3 or more coats of white washing.

2.04.03 Water-proof paint

Surface to be coated with cement paint shall be washed and brushed down. As soon as the moisture has disappeared, the surface shall be given one coat of paint. Care shall be taken so that the paint does not dry out too rapidly. After 4 to 6 hours, the water shall be sprinkled over the surface to assist ouring and prevent creaking. After the first coat has dried (24 to 48 hours), the second coat shall be applied in a similar manner. The finished surface shall be kept moist by occasional sprinkling with water for seven days after painting.

2.04.04 Synthetic Enamel Paint

Shall be applied on properly primered surface. Subsequent coat shall not be applied till the previous coat is dry. The previous coat shall be lightly sand papered for better adhesion of subsequent coats.

2.05.00 Cleaning Up

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The Contractor shall, upon completion of painting, etc. remove all marks and make good surfaces, where paint has been spilled, splashed or splattered, including all equipment, fixtures, glass, furniture, fittings etc. to the satisfaction of the Engineer.

3.00.00 ACCEPTANCE CRITERIA a) All painted surfaces shall be uniform and pleasing in appearance. b) The colour, texture, etc. shall match exactly with approved samples.

c) All stains, Splashes and splatters of paints shall be removed from surrounding surfaces.

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TECHNICAL SPECIFICATION FOR DRAINAGE AND SANITARY FIXTURES

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TECHNICAL SPECIFIATION FOR DRAINAGE AND SANITARY FIXTURES 1.00.00 SCOPE 1.01.00 This section covers the layout and construction of rain water down comers and gutters

inclusive of all ancillary works as required for overall completion of the project. 2.00.00 INSTALLATION 2.00.01 General All pipe lines, locations of fitting and fixtures etc. shall be as per drawings or as directed

by the Engineer. Correctness of lines, plumbs, orientation, symmetry and levels shall be strictly ensured. All item shall be fully secured against movement in any direction and so located as to allow easy maintenance where desired by the Engineer.

All pipelines and fittings, fixtures shall be installed leak proof. When the work under

scope of this specification connects with others the connection shall be such as to prevent any splashing.

2.01.00 Rainwater Down Comers Rain water comer shall be as indicated in relevant drawings. Rainwater down comers shall run along and be secured to walls, columns etc. where

desired by the Engineer these may have to be installed in chases cut in the structure. All pipes shall be well secured and supported by adequately strong brackets. The brackets may be wrought iron clevis type, split ring type or perforated strap iron type as approved by the Engineer. For vertical runs each pipe shall hang freely on its bracket fixed just below the socket. Suitable space blocks shall be provided against the vertical surface to which the pipe is fixed.

All bends and junction shall be supplied with water tight cleanouts. Roof and floor drains shall be installed if required, by cutting into the structure and

grouted with M-15 cement concrete. 2.02.00 Gutters The gutters shall be made of GI or A.C. All gutters shall be supplied by reputable

specialized firms. Each section shall be sufficiently rigid, edges and corners straight and slopes perfectly uniform. The G.I. gutters shall have the edged strengthen by suitable means.

Unless noted otherwise the gutters shall have minimum fall of 1 in 120. Adequate

number of strong supports shall be provided so that there is no deflection over when the gutter is full. Each joint must have a support. Unless otherwise specified the supports

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shall be fabricated M-S. Brackets. All junctions shall be thoroughly watertight. The joints may be made by riveting, bolting or soldering. All joints between successive lengths of gutter shall have an overlap of at lest 5 cm. The drop in the overlap shall always be in the direction of the fall of the gutter. Ends of gutters shall be closed water tight. Junction with rain water down comers shall be made fully water tight and secured.

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GENERAL SANITARY WORKS

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SPECIFICATION FOR SANITARY & PLUMBING WORKS NOTE: This specification should read in conjunction with the bill of quantity and only those items which relate to the bill of quantity be followed. All fixtures etc. shall be tested before fixing against defective manufacture and or defective handling. SCOPE: This specification shall cover providing, installing and commissioning sanitary wares and fixtures complete set with all required accessories including cutting and making good the damages to its original finish and ready for operation. MATERIALS: 1. IPWC (Indian Pattern Water Closet) The water closet shall be of specified size, 23” white glazed earthen wares and fixture complete set with all required accessories including cutting and making good the damages to its original finish and read for operation. CISTERNS: 2. LLS (Low level Cistern) Low level flushing cistern when specified for water closet shall be of 3 Gls. Capacity porcelain, white in colour (if colour not mentioned). Such cistern should include complete accessories with approved pipe connector, C.I. Brackets, C.P. flushing pipe etc. all complete). 3. GWB (General Wash Basin): Wash basin shall be of specified size and colour (white glazed earthen ware if colour not mentioned) single, double or triple hole with single or double pillar cocks as per the item. Such work should include 11/4” dia. C.P. waste, plug, stay, chain C.I. brackets & connector pipe with required brand stopcock etc. all complete. 4. URINALS: Urinals shall be glazed earthen ware, type, size and colour as specified in the item. In absence of such specification in the item urinals shall be white in colour and the type of urinals shall be flat back (size 24”

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x 16” x 15”). Such urinals shall consist of 11/2” dia. Bottle trap Cp spreader pipe, connector pipe etc. all complete. 5. Automatic Flushing Cistern: Automatic Flushing Cistern for the urinals shall be of white (or coloured if specified in the item), porcelain clay or cast iron flushing cistern, inclusive of all required accessories. Generally one gal. capacity cistern for 2 urinals set and 3 gals. Capacity for the set of 3 urinals respectively. 6. Water Tank: Overhead water tank shall be made of G.I. sheet of specified gauge. Such water shall be made water tight. Inlet, outlet, overflow and wash out holes shall be made of exact size and positions. All such holes shall be properly threaded. Along with such level and required valves shall be provided. Such tank shall be coated with 2 coats of anticorrosive paints and outside before fixing. 7. Miscellaneous: Mirror, tower rail and robe hooks, curtain rods etc. shall be of heavy approved quality and shall be as specified in the item. 8. All materials required for reinstating works, shall be as specified in the standard construction materials for civil works. 9. Stopcock and Bibcock: Bib and pillar taps and stop valves shall be as B.S. 1010 : 1953 and shall have ends to suit the pipe to which they are to be connected. They shall have plates for wall fixing where required. Stop valves shall be chromium plated. High pressure full way screw down type with capstan head, screwed for iron both ends or with union at each end if required. Bib and pillar taps shall be chromium plated, high pressure, screw type, “Easy Clean” pattern with polish and fitted with capstan head exact pattern of handle etc. shall be made to the approval of the Engineer. The minimum finished weight of bibcock and stopcock as ISI should be: 1/2” Stopcock 0.40kg. - 14oz. 3/3” Stopcock 0.75kg. - 1 Ib. 10 1/2 oz. 1/2” Bibcock 0.40kg. - 14 oz. 3/4” Bibcock 0.75kg. - 1 oz. 10 1/2 oz.

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METHOD OF EXECUTION: 1. IPWC (Indian Pattern Water Closet): The pan shall be sunk into the floor and embedded in cushion of average 6” cement concrete 1:5:10. This concrete shall be left 4 1/2” below the top of level of the pan so as to allow for flooring and its bed concrete. The pan shall be provided with a 4” HCL trap “p” or “s” with an approximately 2” dia. Vent horn. The joint between the pan and the cistern brackets shall be firmly embedded in the wall in cement mortar 1:4. The cistern shall be provided with 1” GI overflow pipe with fittings. 2. Wash BASIN: The basin shall be supported on a pair of CI or RS cantilever brackets embedded in cement mortar 1:3 or by screws with ditofix.The wall plaster on the rear shall be cut to rest over the tap edge of the basin. After fixing basin, the plaster shall be made good and surface finished to match with the existing one. The CP bottle trap shall be connected with the waste and the down portion with the GI pipe line which is discharging in the floor trap. The height of the front edge of the basin from the floor level shall be 2’-7”. Brackets shall be painted with specified paint. 3. Urinals: Urinals shall be fixed in wall by means of CI or RS brackets, I routed in the wall by cement sand mortar of mix 1:3 or cement concrete of mix 1:2:4. Urinals shall be fixed in such a way that there shall be no gap in between urinal back surface and wall surface. The trap shall be connected as described in case of wash basin. 4. Towel rail & curtain rail brackets shall be fixed by means of CP brass screws to wooden plugs firmly embedded in the wall or by means of screw and ditofix. 5. The mirror shall be mounted on 1/4" thick plain asbestos sheet ground and shall be fixed in position by means of 1” CP brass screws and CP brass clamps with CP brass. Screws. The longer sides shall be fixed horizontally. 6. The robe hooks shall be fixed against wall by means of ditofix and screws. 7. The robe hocks shall be fixed against wall by means of ditofix and screws. 8. Rate: Rate shall be inclusive of all required materials and labourers for all the operations under the relevant items of the works. The rate also includes painting, making good the damages with materials, testing etc. 9. Method of Measurement: Assembly of sanitary fittings or single fitting together with the fixing of the same shall be enumerated.

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WATER SUPPLY SCOPE: The work shall cover all materials required for such pipes and fittings, clamps, long screws etc. The work shall include line marking, jointing the pipes, fixing in position paintings, groove cutting and reinstating to its original finish complete with testing and ready for operation. MATERIALS: 1. GI Pipes and Fitting: The pipe shall be galvanized mild steel wielded tubes and a seamless, screwed and cockeyed tube conforming to the requirement of IS 1239-1958 for light grade. Such pipes shall be “A” class of Indian Tube Company (TATA) and all fittings shall be galvanized malleable cast iron of “r” brand. These pipes shall be painted two coats with black Japan outside before laying in position. 2. Valves: All the gate valves from 1/2” to 3” shall be of gun Metal of approved quality which can withstand to a pressure of 300Ibs. METHOD OF EXECUTION: 1. Pipe and Fitting: The fittings and arrangements of pipes shall be as per the working drawing. All the pipes shall be completely concealed from view. No bend or curve in any water line shall be made as to diminish the waterway or internal diameter of the pipe in any part. Water pipes are cut to size, ends to be squared and all bar removed. All screws thread shall be clear and well cut. The end shall be cut cleanly and squared. The pipes and fitting shall be inspected at site before use. Where the pipes have to be cut or rethreaded the end shall be carefully filed so that no obstruction to bore is offered. The pipe shall be inspected at site before use. Where the pipes have to be cut or rethreaded the end shall be carefully filed so that no obstruction to bore is offered. The pipe shall be cleaned and clear of all foreign matters before being laid. In joining the pipes the inside of the socket and end of the pipe shall be oiled and rubbed over with the white lead and a full turns of spun yarn wrapped round the screw and the pipe. The end shall then be screwed in the socket, tees etc. care should be taken that all pipes and fittings are properly joined so as to make the joints completely water tight. After laying the open ends of the pipe shall be temporarily plugged to prevent access of water, soil or any other foreign matter. Any thread exposed after joining shall be painted or in case of underground piping thickly coated with paint to prevent corrosion. In duct for internal work the

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galvanized iron pipes and fittings shall run on the surface of the wall or ceiling. The fixing shall be done by means of standard pattern holder bats clamp keeping the pipes about 1/2" clear of the wall. For external water lines the pipe shall be laid 2’6” below ground level. The pipes shall not be exposed in the walls or solid floors. Wherever available pipes may be buried for short distanced. Where directed MS Tube sleeve shall be fixed at a place a pipe is passing through a wall or floor. All pipes and fittings shall be fixed truly vertical and horizontal unless unavoidable. 2. Testing: The whole of the pipe lines are to be tested by a hydraulic pressure of 150 Ibs. Per sq. in. and all defects noted are to be rectified before concealing the pipe. All such work shall be in the expense of contractor for which no separate payment is made. 3. Testing The rate shall be inclusive of all materials required, such as pipes, fittings, clamps etc. The rate shall include line markings, groove cutting and fixing of pipes on position, reinstating and all civil work as per civil specification (with required materials) testing all complete. 4. Method of Measurement: The water supply lines shall be measured in running feet correct to an inch for the finished work, including fittings but excluding specials such as taps and valves. The valves like taps, stopcocks etc shall be measured in number. SOIL, WASTE, RAIN WATER & VENT LINES SCOPE: This specification shall cover all materials and labours required for such work like pipes, fittings, clamps, nails, lead and labours of any kind etc. The work shall include line marking, joining the pipes with lead chalked joint, fixing in position, painting, groove cutting and reinstating to its original finish etc. complete with testing and ready for operation. This section covers drainage pipes from the building to the first manhole or to the first gully trap in general. MATERIALS: 1. Pipe and Fittings: Soil, waste rain water and ventilation pipes should conform to BS 416-1931. The pipes shall have spigot and socket and with head on spigot and with or without ears as per need. Such pipes shall be single socket or double socket as required. The pipe and fittings shall be true to shape and cylindrical, their inner and outer surface being as smooth as practicable. They sound and nicely cast and shall be free from cracks. Laps, pin holes or other imperfection and shall be dressed and carefully fitted. The pipes and fittings shall be painted two coats inside and outside with black Japan paint – or other approved anti – corrosive paint before laying in opposition. In fittings access door should be provided with 1/8” rubber insulation packing.

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2. Lead for joint: Lead shall be bluish gray in colour, soft and malleable, readily meted and free from admixture of foreign matter and shall comply with the requirements of IS 782of 1962. METHOD OF EXECUTION: 1. Pipe Laving Work: HCI pipes shall be fixed against wall with the help of Bobbin Nails and also connection in between the main pipe and the branch pipe shall be made by using branches and bends with access doors for cleaning. Floor trap shall be provided with 2” dia. Puff pipe where the length of the waste line is more then 5’0” or the floor trap connected to the waste stack through bends. Waste from, basins, and both “s” or the floor traps shall be separately connected to the waste stack, on upper floor and shall separately connected to the waste stack on upper floor and shall separately over gully trap on the ground floor except in case of lavatories. Every starting manhole shall have a 4” HCL vent, terminal at 3’0” above the parapet of the building or as shown on the drawing. The main antisyphonage pipe shall be of 2” internal dia. All pipes and fittings shall be painted by noncorrosive paint before using. 2. Lead Joints: Lead joints shall be made as follows. The spigot shall be centered at the adjoining socket by lightly chalking in sufficient turns of well tarred gasket of lead strip to leave unfilled the required depth of socket for a lead. When the gasket of lead strip has been tighten then a jointing ring shall be placed round the berel and against the face of the socket. Molten pig lead shall be poured in to fill the remainder of the socket, care being taken to ensure that the molten lead does not get chilled while carrying it from the melting pot to the joints. Before pouring all scums shall be removed. Each shall be made with one “continuous pour” filling the entire joint space with molten lead at time. Spongy or imperfectly filled joints shall be burnt out and repoured. The table below shows the approximate quantity of joining materials to be used per joint. The lead shall be solidify chaulked, with suitable tools and hammers of not less than 4 Ibs, weight, all round the joint to make up for the shrinkage of the molten metal on cooling. The lead joints shall preferably be finished slightly behind (3 mm) the socket face. Internal Dia. Of pipe Approx. weight of lead Approx. weight of yarn to be used per joint to be used per joint 2 inches 2 Ibs 2 oz. 4 inches 4 Ibs 4 oz. 6 inches 6 Ibs 6 oz.

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3. Testing: All soil, waste and vent pipes shall be tested for the approval and the contractor is to provide all the labour and apparatus for carrying out the tests. All the leaks of defects appearing during the test shall be rectified by the contractor at his own expenses. 4. Rate: The rate shall be inclusive of all the materials required such as pipes, clamps, etc. excluding specials and lead joints. The rate also shall include line marking, groove cuttings, floor cutting, cutting and fixing in position, reinstating of all civil works as per civil specification (with required materials) testing all complete. The rate for lead shall include costs of lead, gasket etc. including proper chalked jointing complete. 5. Measurements: The length of the pipes shall be measured net as laid or fixed in raft (running foot) correct to an inch excluding specials which shall be enumerated separately. The length of pipes shall however, not include the portion of spigot within sockets of specials and pipes at the joints. Lead chalked joints shall also be enumerated separately. NOTE: 1. Cutting of pipe shall be done only by saw, no hammering shall be allowed. 2. To carry out the plumbing work the contractor shall provide shop drawings of soil, waste. Vent and waterline for approval of the Engineer.

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DRAINAGE SCOPE: That work shall cover all materials required for drainage piping, constructing manhole etc. including line marking, excavation, concreting, walling, laying pipes testing etc. all complete. MATERIALS: 1. Pipes: The drain pipes from the building to the manholes and that between the manholes inside the building shall be cast iron, spigot and socket, drain pipes as IS 1536 of 1960, grade “A” and jointed with lead joints. Pipes shall be of approved manufacturer (The Indian Iron & steel Co. Ltd. Or similar other approved) and of medium grade and shall be coated with heavy coat of anticorrosive Bituminous paint in and out before delivery. All fittings shall be of approved manufacture suitable for the medium grade C.I. pipes and free from blow holes and other defects and flaws. The pipes and fitting are also to be coated with coats of approved bituminous paint in and out before fixing and two coats after fixing externally. Where it is necessary to cut C.I. pipes, this shall be done with suitable wheel type cutter so as to leave it clean and square. 2. MANHOLES: 2’x2’ manholes as per drawing shall be constructed with bricks in cement mortar 1:6 and shall be of size as per drawings. Concrete benching to bottom manholes shall be in concrete 1:2:4 with 3/8” grades aggregate and curved and/or straight half round main and branch channels as required shall be plastered in cement mortar (1:4) ½” thick. The benching shall be flanged up to a slope of 1:2 from the edge of the channel to sides of manholes and finished in cement mortar (1/4) 1/2” thick and steel trowelled smooth. The branch channels are to be so formed so as to fall into the main channels in the directions of the main flow. Cover slab shall be precast concrete (1:2:4) 4” thick suitably holed covers and frames and reinforcement with 3/8” MS bar at 6” c/c. Steps shall be made out of 1/2” dia. M.S. rod as per drawing. METHOD OF EXECUTION: Excavation for pipes, manholes etc. to be excavated in open trenches etc. to true lines and depths as shown or required including planking and shuttering as necessary. The minimum width of trench should not be less than diameter of pipes plus 40cm. Bottoms of excavations to be formed to accurate level of gradients and thoroughly consolidated to satisfaction. The Contractor is to notify Engineer for inspection before concrete or pipes are laid. The Engineer shall have authority to prescribe the lengths of trenches, excavation etc. which the contractor shall open up at one time. The contractor shall refill the trenches with selected excavated materials when drains have been tested and approved. Mud or other soft materials shall be removed and not utilized for refilling. In refilling the trenches the pipes are to be first completely surrounded with sand to a minimum thickness equal to the diameter of the pipes on all side followed by selected excavated materials deposited in layers not exceeding 6” n layer deposited utmost care should be taken not to disturb or damage pipe etc. “Sand Filling” as stated above is not to be done where the pipes are protected by concrete casings. Mechanical trench rammers shall not be used on the works.

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1. Concrete protection to pipes: All drains and sewers which pass under buildings drain, reads etc. shall be of “medium cast iron” and shall be surrounded by cement concrete (1:3:6) the dimension on either direction being thrice the shape of pipe surrounded. Similar encasing with cement concrete shall be done to other pipe lines also as and where directed by the Engineer. 2. SW Pipe Drains – Laying: The drains shall be laid accurately and perfectly true to line and gradient shall be made inside the manholes by means of curved or tapered channels formed in cement concrete, smooth finished and benched up on both sides. The pipe shall be laid in socket up gradient. There shall be at least three sight rails on every length, so that the movement of any rail will at once be apparent by sighting over the two. Any pipes or pipes laid which on inspection are found to diverge from the true lines and level are to be taken out and re-laid, The joints being properly cleaned off the pipes and fresh joints made. 3. Salt Glazed Stone Ware Pipe Drain Work Fixing and Joining: The drain shall be laid accurately true to line and gradient from point to point. All junctions and changes in directions and diameter shall be made inside the manhole as per drawings and instructions of the Engineer. The pipe shall be laid socket up in 4” thick cement concrete 1:3:6 and covered with the cement concrete as per drawing. Any pipe or pipes laid which on inspection are found to diverge from the true lines and levels are to be taken out and relaid the joining being properly cleaned off the pipes and fresh joints made. In making a joint, spigot of each pipe is to be carefully wrapped with terrel gasket sufficient thick to fit tightly the socket of the adjoining pipe and allow for a proper alignment. The gasket being carefully driven home with a chaulking tool so as to occupy not more then one quarter of sockets depths. Pipes are to be joined with cement mortar consisting of one part cement and one part sand mixed with adequate quantity of water to form a plastic mortar which shall be forced in and completely fill up the space in the joint. Once the pipes are joined it shall be protected by moist sand, wet gunny bag or other suitable means for at least 3 days. Care shall be taken joining the spigot so that the spigot is correctly concentric with the socket. 4 Testing: All soil drains, manholes will be tested for the approval of Engineer and the contractor is to provide all labour and apparatus for carrying out the tests. The drains are tested by filling with the water twice (a) after being laid and before trenches have been filled in or pipes surrounded with concrete and (b) after the trenches have been filled in at completion of the work. Manholes and branch drains discharging into manholes will be tested independently.

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The joints and pipes shall shown no sign of “seepage” of leaking when subjected to a minimum head of 2.5 M above crown of pipe at its highest end. This shall be obtained by means of approved testing apparatus as described in appendix 8 of IS 4127 of 1967. The test shall be maintained for 3 minutes and no less of water (other than by absorption or evaporation) shall constitute a satisfactory test. Manholes will be tested by filling with water exceeding 2’0” and not exceeding 4’0” head. All leak defects appearing during the test shall be rectified by the contractor including taking up and relaying defective pipes with new and rebuilding manhole etc. if necessary all at his own expense. 5. Rate: The rate shall be inclusive of all materials required such as pipes, clamps etc. excluding specials. The rates shall also include line marking excavation of earth-work and back filling concreting cutting and fixing and fixing in position reinstating of all civil work as per civil specification (with required materials) testing all complete. 6. Method of Measurement: The pipe shall be measured in running foot correct to an inch for net finish work, excluding specials such as bends, tee etc. The overlap of such pipes shall not be measured. The special, traps and manholes shall be measured in numbers. The read laid S.W. pipe shall be measured including fitting along the central line of the pipe excluding overlap on the pipe and fittings.

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ELECTRIFICATION WORKS

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ELECTRICAL WORKS SPECIFICATION SCOPE OF WORKS: Provide all labour, materials equipment’s, transportation and operation and tests necessary for and incidental to the completion and operation of the complete Electrical System as required and as specified herein or shown on the Drawings. (a) Complete Electrical Installation including underground line; disconnect switches etc. as detailed in the Bill of Quantities. (b) Complete lighting and power wiring systems and earthling systems. (c) Lighting and power panel boards, switchboards. (d) Lighting fixtures, switches, outlets, conduits, etc. (e) Construction of 11000 volts and 415 volts electric power lines from Nepal Electricity Authority (NEA) grid to the project sites including steel pole insulators and accessories. (f) Provide for installation of other miscellaneous Electrical wiring required for all plumbing, electronic and mechanical equipment, complete as shown on the drawing and as specified herein. During the progress of the work, the contractor shall be required to keep up-to-date details of the information from which his final record drawings will be prepared. These drawings shall be available at any time for inspection by the Engineer and particularly before such conduits, etc. are concealed. Upon completion of the electrical work the contractor shall submit, for the project’s records, reproducible drawings showing the layout of the electrical systems as constructed and denoting all information pertinent to the proper maintenance of the systems. STANDARDS: The goods and all materials, workmanship and components shall where applicable unless otherwise stated in the contract comply with either. (a) a relevant British and Indian Standard of code of practice current on the date fixed for receipt of tenders or (b) the requirement of another authoritive standard which shall be no less exacting than the corresponding standard quoted herein, providing that the standard is acceptable to the purchaser. The following standards are referred to herein and are referred to by the observation shown and are available from the following addresses: British (B.S.) and British Standard Code of practice (C.P.) from: British Standards Institutions British Standards House 2park street, London England

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Indian Standards (I.S.) from: Indian Standards Institutions Nanak Bhawan 9 Bahadur Shah Jafar Marg New Delhi 1. The acceptance of a tender based upon a standard or code of practice proposed by the supplier shall only signify the Engineer’s general approval to the use such standard or code of practice and shall not signify acceptance by the Engineer of any materials or workmanship subsequently found to be inferior to that specified in the relevant British or Indian standard or code of practice. A.S.C.R. Conductor The A.S.C.R.conductors shall comply with IEC publication 209 or equivalent standards. All strands of all conductors shall be greased with Shell Ensues 366 or equivalent which shall completely fill the interstices between the strands. The conductors shall be manufactures such that twisting is as small as possible when subjected to axial loads e.g. during out-pulling and stringing. The steel strands of ACSR conductors shall be performed so that they remain in place and do not more relative to each other when the conductor is cut. The outermost layer of all conductors shall be standard with right hand lay. In addition to the standards, it is specified that the number of joints in individual wires made during stranding shall not exceed five per standard length of conductor in drum. - The number of wires of he layer for the inner layer. - Two for the other layers. These joints are permitted only in aluminum wires avoidly broken during the stranding operation. The purity of the aluminum shall be the highest commercially available and not less than 00.5% the copper content not exceeding 0.04%. The contractor shall submit certificates or analyses giving the percentage and nature of any impurities in the metal from which the wires are made. Precautions shall be taken during the manufacturer and storage of contamination by copper or other materials which may adversely affect the aluminum. The manufacture of steel cored aluminum conductors shall be carried out in a factory specially sat aside for such purposes. In the event of any machinery used for conductor manufacture being used for material other than aluminum of galvanized steel strand, the contractor shall furnish the owner with a certificate that the machinery has been thoroughly cleaned before use on this contract is free from contamination. The conductors shall have following characteristics. Code word – Rabbit Nominal Cu. Equivalent area 30mm sq. Aluminum area 52.21 mm sq. Area of complete conductor 61.70mm sq. Aluminum strands: Number 6 Diameter 3.35 mm Steel strands:

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Number: 1 Diameter: 3.35 mm Total dia. Of conductor: 10.05mm Ultimate strength weight: 1860 kg Aluminum 145 kg/km Total: 214 kg/km Resistance at 20 C 0.544900 hm/km Conductor Drum length All the conductors shall be supplied in the standard drum-length but not less than one km. The full possible use shall be made from the maximum conductor length in order to keep to a minimum number of mid span joint packing. Conductors shall be supplied on drums and the drums shall be securely battened to protect the conductor. The drums shall be study in construction and of such material to with stand land transport, several loading and unloading, storage in the tropics, handling and field erection of the conductors. All drums with ACSR conductors shall have a layer of waterproof paper around the barrel, under the conductor and another over the conductor and under the battening. Lightning Arresters: The contractor shall include in his Tender brief description & outline drawing of the proposed arresters to be supplied. Lighting arresters shall be manufactured according to IS 3070-1974 or applicable equivalent standards. Lightning arresters shall consist of an assembly of spark gaps and nonlinear resistors housed in porcelain insulators. The arrester shall be hermetically sealed and filled with an inert gas. The porcelain shall be smoothly glazed. Arrester voltage rating in KV (r.m.s) 9 KV Nominal discharge current (8/20 ms) 5 KZ No. of phases Single phase 3. Pcs. Complete Frequency of system 50 c/s Type of mounting class bracket Nominal system voltage 11 KV Highest system voltage 12 KV System natural connection solidly earthen Installation outdoor Equipment to be protected Power station & transformer Power frequency voltage Withstand of the external Insulation (wet 10 set) 30 KV (Dry 1 win) 35 KV Impulse Minimum impulse spark over Voltages 75 KV With linear 1.2/50mm. front wave 35 KV

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And maximum residual voltage 44 KV Tests: Type, routine, and acceptance tests according to IS 3070-1974 or applicable equivalent standards shall be performed. The manufacturer after receiving the order. (A) 11 kv pin Insulator The pin insulator shall be brown glazed porcelain insulator with lead thimble generally with the following requirements and covered by IS 1445-731, 1966. (a) Creepage distance 275 mm (b) Cantilever strength 1080 kg (c) Flash over voltage (dry) 80 KV (d) Flash over voltage (wet) 50 KV (e) 50% impulse flash over 1/50 ms. Wave (i) Positive peak 115 KV (ii) Negative peak 140 KV (f) Puncture voltage 150 KV (g) Height 135 mm (h) Diameter 140 mm The pin insulator shall be complete with 1.80 kg GI spindle. The spindle shall be complete with nut, shock nut, washers all galvanized. (B) 11KV Disc Insulator The disc insulator shall be of ball and socket type and shall be finished in accordance with IS 731-1963. The insulator shall be brown glazed porcelain of the ball and socket type in accordance with the following characteristic. (a) combined electrical and mechanical strength 6800 kg (b) Porcelain disc dia. 254 mm (c) Unit spacing 145mm (d) Leakage distance 280 mm (e) Flash over voltage (dry) 80 KV (f) Flash over voltage (wet) 50 KV (g) 50% flash over impulse Voltage 1/50ms. Wave (h) Positive peak 107 KV (i) Negative peak 120 KV (j) Low frequency punctures voltage 110 KV Tests: (1) Routing Tests (a) Visual inspection

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(2) Type Tests a) Power frequency voltage withstand test (wet) b) Power frequency puncture with stand test c) Mechanical failing load test Main Power Controls Panels A. Main power control panels shall be made of folded steel sheet 2.5 mm thick with anti rust protection and anti corrosion painting. They shall be installed in the substation/Electric room as shown on the drawings and shall have a protection degree of IP 54. The low-voltage distribution switchboard serving to control and protect the L.V. outgoing distribution boards shall be manufactured and tested in accordance with the provisions of B.S. 162 and the relevant British Standards as regards the various components. It shall be provided with a pressure resistant two-wing door and a detachable plate of structural material in the cable termination space. B. Busbars Each L.V. panel shall comprise five busbars: three for the phases, one for the neutral and one from the potential equalization (ground). Busbars shall be made of hard drawn high conductivity electrolytic copper according to B.S. 1433. They shall be air insulated, of dimensions and short circuit rating as shown on the drawings. C. Moulded Case Circuit-Breakers The molded case circuit-breakers shall be manufactured according to IEC 157 or equivalent and shall have the following characteristics: - Rated voltage : 400 V - Nominal current rating : 250 A, 200A, 100A, 60A, : 30 A & 20 A as Shown on the drawings - Nominal of poles : 50 HZ - Total break-time : 30 KA for 250 A and 10 KA For 100 A current rating. - Number of poles : 3 - Total break-time : 20 ms - Making capacity (peak) : 40 KA - Breaking capacity (rms) - Short time current (rms) (0.38 second) : 20 KA - Number of poles : 3 The switch disconnectors shall consist of a fully enclosed housing fabricated from non-tracking heat resistance insulating material, accommodating the silver-plated fixed movable contacts.

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The movable contacts shall be driven by a robust switching mechanism with quick make and-break operation. Handles complete with position indication shall be provided; the protection class shall be IP 56 according to IEC 529. D. Measuring Instruments a. Ammeters Ammeters shall be of 96*96mm size with quadrant scale, scaled according to the corresponding current transformer rating and shall have the following characteristic: - Mechanism : Moving iron - Tolerance : Class 1.5 - Maximum current : 5 A - Frequency Range : 15 10 65 HZ - Scale graduation : Starting of about one Fifth of full scale value. - Overload capacity : 1.2 times continuously, 50 times for 1 sec., 4 times For 2 or 3 min, 2 times for About 10 min. Ammeters shall be connected through current transformers. b. Voltmeters Voltmeters shall be of 96*96 mm size with quadrant scale, scaled 0-500 V was built-in series resistor to the rear of the indicator, having the following characteristic: - Mechanism : Noving coil - Tolerance : Class 1.5 - Frequency range : 15-65 HZ - Scale graduation : Starting at about one fifth Of full scale value. - Overload capacity : 2 times for 1 min. The measuring of voltage for each phase shall be affected through one five-way voltmeter selector switch. Miscellaneous Before dispatching from the factory, all components of the main low-voltage distribution switchboard shall be subjected to the routine tests specified in relevant British Standards, or equivalent. Furthermore certificates issued by a testing organization acceptable to the Engineer shall be submitted to the Engineer by the contractor providing that the tupes of the components to be supplied have passed the type test prescribed in the relevant British Standard or equivalent. Prior to ordering the relevant equipment the contractor shall submit to the Engineer for approval information and data stated in the relevant British Standards or equivalent as regards the components of the distribution switchboard.

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M.C.B. Distribution Boards. 1. This section comprises of surface/recess type Distribution Boards complete with required miniature circuit breakers (MCB). 2. These Distribution Boards with enclosures, bus bars, neutral links, and earth links, shall be of the original manufactures only as indicated in the approved lists. 3. The B.Bs’s shall be duly connected with the wire way ducting or conduits to make it electrically and mechanically continuous with the help of socket bushes, or flange plates, as desired by the Engineer. 4. All D.B.’s shall be required to be connected with incoming sub-main cable and outgoing circuit wiring with Bowel’s or approved equivalent crimping lugs for wires of 6 sg.mm. or bigger sizes cables lugs shall be crimped with proper tools at site. Rates quoted by the contractor shall be include the connections in the D.B.’s. 5. D.B.’s shall be fixed on the walls/or flush with wall (recessed) in approved manner and damage to wall made good as per original. 6. Damage to the original paint to the D.B.’s if any, shall be made good as desired by the Engineer. 7. D.B.’s shall be dust and vermin proof. These shall have hinged covers and MCB’s shall not be oper able without opening these covers. Phase barriers and shrouding sheet shall also be provided in D.B. the D.B. shall be fabricated of 14 SWG CRCA sheet and shall be stove enamel painted. 8. Blank spaces (spares) shall be covered with blanking plate. 9. The breaker shall have quick break trip free mechanism with thermal over load and magnetic short circuit tripping devices. The mechanism shall be such that the circuit can not be held closed against a fault. The thermal items shall prevent reclosing of a circuit when a fault or over load persists. 10. The contact shall be silver tungsten or other suitable material to give long contact life. Multiple units shall have common inter tripping mechanisms. 11. Miniature Circuit breakers in the panels shall have phase sequence numbering. The phase to which each single pole branch is connected shall be clearly indicated and so arranged that any three adjacent drenches are connected to phase RY and B respectively and the same relationship of phase sequence is maintained. 12. Circuit Diagrams of each D.B. shall be fixed to the outer cover of the D.B. which shall clearly identify circuit number and connected load points. 13. Each MCB shall have fault current of 9 KA for 5 A and 15 A load at 220 V supply system. 14. Approved M.C.B. Distribution Board names are: (a) Standard Kupp (b) Mitsubishi (c) Havel’s

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(d) National electric Works, Kathmandu Rates: The rates for wiring light, fan and all plug points given in the schedule of work attached with the tender, shall be irrespective of the length of points circuit wires of these points shall also be part of the point rate. The conductor for final sub-circuit for points shall have a nominal cross section area not les than 2.5 sq.mm. Copper conductor for lights and fan circuit and 4 sq.mm. for power sub-circuit in the case of general light and power wiring. (a) The contractor shall prepare fabrication and detailed working drawings and obtain the approval of the Engineer. All the work shall be carried out only on approval of these drawings. However, approval of the drawings does not relieve the contractor of his responsibility to meet with the intent of this work. These drawings must give the following information: (i) runs of wooden/PVC batten and largest number of wires contained in circuits and size of wires for point wiring. (ii) Location of all distribution boards, main switch, junctions and pull boxes and fuses. (iii) Complete schematic diagram of the installation. (iv) Location of earthing stations. Position of Lighting, Distribution Boards & Switch Gears: (a) Should there be any discrepancy or incomplete description, ambiguity or omission in the drawings and other documents, whether original or supplementary forming the contract, the Tendered shall immediately on discovering the same, draw these to the attention of the Engineer. (b)Before commencement of work, the exact final position of all the points switch boxes and the distribution boards shall be ascertained by the Tendered from the Engineer. Samples: The contractor shall submit 2 sets of the samples of accessories and apparatus he proposes to use in the installation, to the Engineer for approval. Drawings of samples, as required shall be submitted by the contractor and these specifications shall not be departed from without written instructions from the Engineer. The verbal approval given by the Engineer to any drawing or samples submitted by the contractor shall in no way exonerate the contractor from liability to carry out the work in accordance with the terms of the contract. Fans and Requlators: (a) Unless otherwise specified or directed, all fans shall be suspended so that the blade are 9 ft. above the floor. (b) Each fan shall have a separate tumbler switch and speed regulator. The canopy at the top of the suspension rod shall effectively hide the suspension hook.

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(c) Exhaust fans shall be fixed in the walls or in the ventilator section of the window as near the roof as far as possible at the location shown in the plan. They shall be wired to a ceiling rose/plug socket adjacent to it’s as required. They shall be bonded to earth with No. 14 SWG copper wire and be provided with the individual control switches. (d) Bracket fans shall be fixed at a height specified by the Engineer. (e) The leading in VIR/PVC wires the suspension rod of ceiling fans and brackets fans and the leading in wires of exhaust fans shall not be smaller than 1.5 sq mm. in size cable and shall be protected from abrasion. (f) Approved brand of fans are G.E.C. Sanyo, Crompton, USHA. Model, colour and other specification shall be proposed by the contractor for approval of the Engineer. Fittings: Unless otherwise specified light fittings shall be generally fixed as directed by the Engineer: (a) Wall fittings such as brackets bottom holders etc. shall be at 6’-6” height unless otherwise specified or directed. (b) All ceiling fittings shall be flush with the ceiling and installed with/without leak wood round base of approved design as specified. (c) Bulk head fittings shall be flush with the ceiling/wall as required, Bulk head fittings on walls shall be at a height as specified. (d) Pendant fittings shall be suspended to a height of 8’-0” from floor level. (e) All fittings shall have their leading in VIR/PVC wires of size not less than 1.5 sq.mm. cable or otherwise as directed by the Engineer. Pendant shall be suspended with T.R.S. Twin are flexible cable (black) of size not less than 14/0076”. (f) Screwed holders shall be used in brackets and pendants. Batten light fittings shall have brass holder on T.W. round block in case of surface wiring and Bakelite batten holder in case of recessed system of wiring. (g) Ceiling Rose: for recessed system of wiring this shall be of porcelain make and flush type. For surface type of wiring, this shall be of Bakelite. (h) Fixing of light fixture in false ceilings: In false ceilings all types of recessed/surface lighting fixtures shall be independently supported by means of separate fixing arrangement to the fixture and structural ceiling (by means of clamps) so that the fixture is held rigidly or as instructed by the Engineer. LV Cables: Single core, Four core, Five core, as shown on the drawings, copper conductor, PVC insulated, PVC sheathed, single wire armored and PVC served, 0.6/1 KV rated cables shall be used in the low voltage distribution system following technical characteristic: - Number of cores: 4 or 5 for three phase systems 2 or 3 core for single-phase systems. - Rated voltage: 0.6/1 KV

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- Neutral of distribution system solidly earthen. - Cross-section of copper conductors as shown on the drawings. - Cables shall withstand a continuous copper temperature of 75c. The cables shall consist of; - Shaped stranded copper conductors - PVC insulation - Layer of extruded PVC - Galvanized steel wire armor The conductor shall be stranded with successive layers of plain annealed wires, drawn from electrolytic copper of high conductivity meeting the requirements 0f BS 6360. In the stranding and shaping process, each conductor shall be prespiralled to the lay of the finished cable, so the cores will automatically bed in their relative position when laid-up. Conductors shall have smooth contours, free from sharp edges or projections, which could damage the insulation or cause high local electrical stresses. Number and diameter of wires shall be according to B.S. 6360. The cables shall be sheathed over the laid-up cores by a layer of extruded PVC complying with B.S. 6746 or equivalent. The armor shall consist of a single layer of galvanized steel wires complying with B.S. 1442 or equivalent. The diameter of the armor wire shall be in accordance with B.S. 5467. The armor shall be protected by an extruded layer of black PVC complying with the requirements B.S. 6746 foe general purposed insulation. Earthing Installation: Earth Installation: the entire electrical network shall be solidly and effectively earthen rigorously following the methods as per I.S. 3043-1966. The site for the earth station shall be selected as closes to the substation or switch room as possible. The site so selected shall nave to be moist with a tendency to remain water-logged even during the direst season of the year. Such place can be located near the drain outlet from the main building. The earth pit shall be one meter square and 2m. deep. A 1m*6mm electrolytically pure copper plate shall be use as earth electrode which shall be laid vertically against the side of the pit. The earth lead from the electrode shall be (25*3) mm copper strip or 6.0 S.W.G. copper conductors as specified which has to be brazed to the electrode to sustain the flow of heavy current without effecting the brazing during heavy fault conditions. In order to improve the conductivity of the soil, common salt and charcoal shall be used of needed quantity to cover the electrode before refilling the pit. The earth resistance then shall have to be measured and it must remain as close as one ohm. If this value is not reached then other pits shall have to be dug and repeat the similar process and connect the earth stations in parallel till the required value of the earth resistance is obtained.

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Lighting Protection on Water Tower: 1. General: The Electrical Contractor shall be responsible for the supply and installation of the complete lightning protection system, which may be carried out by a specialist sub-contractor approved or specified by the Engineer. The installation shall consist of air networks connected to the water tower top and own conductor, and finally, terminated to the earth electrode, via, suitable test points, all in accordance with the details as indicated on the drawings. Conductors shall consist of 25*3 mm. soft annealed copper strips. Air Termination Net Work: Air Termination shall consist of horizontal conductors insulated in accordance with the Indian Standard code 2309:1969 Practice for the protection of Buildings and allied structures against lightning/B.S. code of practice CP: 326-1965. All exposed metal work and roof structures, forming part of the structure to be protected shall be bonded to the net work by the conductors of the appropriate cross section. Down Conductors: From the air termination’s 25*3 mm. down conductors shall be installed and fixed to the structure as indicated on the drawings. The conductors shall follow the most direct route to the earth rod or earth network. Test clamps connecting down conductors to the earth system shall be fixed to the water tower structure at between 450mm and 2m above ground level. Joints in down conductors shall not be permitted and provision shall be made for expansion and contraction of conductors. Special care being taken in the fixing of support to allow for movement. 4. Earthling Arrangement: Earth tapes of 25*3mm minimum size shall be connected to the down tapes at the test clamps and routed to the earth rods as indicated on the drawings. The tapes shall b buried at not less than 0.5 metres below ground. The arrangements shall conform with the earthling section of this specification. 5. Test Clamps: Test clamps shall be manufactured from phosphor bronze, admiralty brass or approved equivalent with two fixing holes suitably counter sunk to receive No. 8 screws. Copper bonding tapes shall be tinned prior to bolting to test clamps and connected surfaces of all tapes shall be treated with an approved petroleum jelly or grease.

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Tape conductors shall be fixed to flat roof surfaces by means of suitable felt pads, fused to the bitumen felt covering or asphalt, alternative fixing arrangements may be sued subject to the approval of the Engineer. Where tape conductors are fixed to walls or structural work they shall be fixed by means of distance type saddles or hold fasts, as detailed. They shall be not less than 19mm wide by 3mm thick of phosphor bronze, admiralty brass or hard drawn copper for copper taped, and aluminum for hard drawn copper for copper tapes, and aluminum for aluminum tapes, and galvanized for galvanized iron tapes. Conductors shall be supported by saddles at the following spacing: (a) Vertical runs at 0.7mm centre. (b) Horizontal runs on horizontal surfaces at 0.6 centres. (c) Horizontal runs on vertical surface at 0.6 centres. All fixing screws shall be brass and the minimum size used shall be 31mm*8mm. Round headed shall be used generally by where necessary counter sunk screws shall be used. 6. Joints and Bends: Joints will not normally be permitted, but where specified or approved, they shall conform to the current Indian Standard. All bonds shall conform to earthling sections of this specification. In case of G.I. strips joints shall be welded and protected from corrosion. 7. Testing: All system shall be tested in accordance with the I.S. code of practice for lighting protection, as well as the I.S. code of practice for earthing. The resistance of each metallic conducting path, including all joints shall not exceed the calculated resistance of the tape itself by more than six percent. Signal Light on Tank: A signal red light fixture with 200 W GLS lamp capacity or equivalent with weatherproof glass reflector holder shall be installed on the point of the water tanks. All fixtures cables shall be properly connected to the earthing network provided separately for this purpose. Spare bulbs, at least two for each sit shall be provided free of extra charge. Wiring cables shall be enclosed in medium class PVC pipes and clamped properly. Testing of Installation: (a) Insulation Resistance: (i) The insulation resistance shall be measured by applying between earth and the whole system of conductors or any section thereof with all fuses in place and all switches closed, and except in earthing Concentric wiring and all lamps in position or both poles of the installation otherwise electrically connected together, a direct current pressure less than twice the working pressure provided that it need not

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exceed 500 volts for medium voltage circuits. Where the supply is derived from the 3 wire (A.C. or D.C) or a poly phase system, the neutral pole of which is connected to earth either direct or through added resistance, the working pressure shall be deemed to be that which is maintained between the outer or phase conductor and the neutral. (ii) The insulation resistance measured above shall not be less than 50 divided by the nmber or points on the circuit provided that the whole installation shall not be required to have an insulation resistance greater than one megohm. (iii) Control rheostats, heating and power appliances and electric sign may, if required, be disconnected from the circuit during the test, but in that event the insulation resistance between the code or frame work, and all live parts of each rheostat, appliances and sign, shall be not less than specified in the relevant Indian Standard specification or where there is no such specification shall be not less than half a meghohm. (iv) The insulation resistance shall also be measured between all conductors connected to one pole or phase conductor of the supply and all the conductors connected to the middle wire or the neutral or to the other pole or phase connectors of the supply and its valve shall not be less than that specified in sub-clause (ii). (v) On completion of an electric installation (or an extension to an installation) a certificate shall be furnished by the contractor countersigned by the certified supervisor under whose direct supervision, the installation was carried out. This certificate shall be in the prescribed form as required by the local Electric Supply Authorities. (b) Testing of Earth Continuity path: The earth continuity conductor including metal conduits and metallic envelopes of cables in all cases shall be tested for electric continuity and the electrical resistance of the same along with the earthing lead but excluding any added resistance or earth leakage circuit breaker measured from the connection with the earth electrode to any point in the earth continuity conductor in the completed installation shall not exceed one ohm. (c) Testing of Polarity of non-linked Single Pole Switches: (i) In a two wire installation a test shall be made to verify that all non linked single pole switches have been fitted in the same conductor throughout and such conductor shall be labeled or marked for connection to an outer or phase conductor or to the non-earthen conductor of the supply. (ii) In a two wire installation a test shall be made to verify that every non-linked single pole switch is fitted in a conductor which is labeled or marked for connection to one of the outer or phase conductor or the supply. Installation of Submersible Pump Motors Starter Unit: The electrical contractor shall be responsible to arrange two separate 415 volts three phase power line circuits to the two sets of pump motors connected controlled through the main power control panel and star delta starters for each unit of pump motors. Since installation of the submersible pump motors will be done by the pump supplier but overall electrical works including connection arrangement between motor starters and main power control panel shall be executed by the electrical contractor in close consultation with the pump supplier. Miscellaneous materials like cables, cable lugs, control relays, fuses whatsoever required shall be arranged by the electrical contractor charging a reasonable price and be approved by the

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Engineer. The Pump manufacturer shall supply a complete set of motor starters and accessories to install the same. Set Installation: One Diesel Generator set 60 KVA, 3 ph, 415 volts capacity installation shall be carried out by the contractor at Harihar Bhawan. All installation materials including power and control cables jointing, connecting, fixing materials will be provided by the contractor. Electric work for the D.G. set includes the erection, assembly, and testing of the following equipment: a. Diesel Generator (alternator) b. Diesel Engine c. Installation of day fuel tank and reserve fuel tank (5KL capacity-outdoor installation) and fuel lines with installation materials for this purpose. The contractor shall fasten down the base by means of anchor bolts set into the concrete foundation. Anchor bolts shall be provided by the D.G set supplier. The mechanical work required to fix all exhaust piping and muffler supporters shall be provided by the contractor. Test Following the complete installation of the unit and its associated equipment, field and operational tests shall be conducted under the supervision of the manufacturer’s technical representative. The contractor shall provide all instruments labour, test loads and supplies required for the test including fuel and lubricating oils. Sequence of Field Testing a. Check all unit mounting bolts and check and record alignment of engine and generator by diesel indication. b.Test generator and exciter insulation resistance with a mugger. c.Perform engine manufacturer’s recommended pre-starting checks. d. Start engine and make engine manufacturers after starting checks during a reasonable run-in or warm-up period. e. Operate generator set for 8 hours at 75% to 100% of rated load. Data shall be recorded hourly and shall include all electrical and temperature information. The manual transfer switch connection between the transformer and the D.G. set shall be performed by the contractor. After successful completion of the test procedures on the D.G. set, the project will issue a completion certificate. List of Approved Electrical Materials 1. Light fixtures - Philips, Crompton, Mayfair, Crystal, Decon 2. Switch - L & T, GEC, Mitsubishi, Siemens, Terasaki 3. Moulded case

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Circuit Breakers (MCCB) - L & T, GEC, Mitsubishi, Siemens, Terasaki 4. Ceiling Fans - Crompton, Usha, GEC, Sanyo 5. Exhaust fans - Crompton, Usha, GEC, Sanyo 6. PVC cables & ACSR Conductors - Prakash, INCAB, Janta 7. Lightning Arresters - GEC, Japanese’s or European 8. Drop out Fuses - GEC, Japanese’s or European 9. MCCB - Standard Kupp, MDS, Mitsubishi 10. Sockets and Switches - Clipsal, Anchor (First Quality), MK India 11. Post Top Light Fixture - Mayfair, Crompton Note: The sample and catalogue number and detailed technical data sheet of the items proposed to be used in the project shall be submitted well in advance for the Engineer’s approval. Preamble to schedule of quantities 1. Tender shall be on the basis of item rates which shall include the cost of materials, labour, all taxes, duties, and all other appurtenant services required of the complete installation, testing and commissioning in accordance with relevant drawings and meeting the requirements of the specifications and relevant I.S. specification including the fees for inspection together with the liabilities and obligation as detailed in the General Conditions of contract. 2. Price shall remain firm and free from variation due to the rise and fall in the cost of materials and labour or any other price variation whatsoever whether during the stipulated period of execution or during extended period of completion if any, except direct statutory, increase by the act of Govt. or local Bodies. 3. Item rates shall remain valid for any variations in the estimated quantities given in the schedule of quantities. 4. In order to facilitate the technical scrutiny of various quotations, the tendered must supply with their quotations detailed technical particulars, make, catalogues and erection drawings for various items under different parts specified in the schedule of quantities. 5. The power supply shall be 3 phase, 4 wire, 415/240 volts A.C. and frequency of 50 cycles, per second. All consuming devices shall be suitable for the voltage and frequency mentioned above. 6.The drawings and specification lay down minimum standard of equipment and workmanship and deviations, if any, shall be clearly set down in Annexure-I. In the absence of any deviations, it will deemed that the tendered is fully satisfied with the intents of the specifications and drawings and their

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compliance with the statutory and fire insurance provision including local codes. Where the drawings and specification conflict, the more stringent shall apply. 7. All equipment and the installation shall be tested as specified and a test certificate in the prescribed from as required by the local supply authorities shall be furnished. 8. The entire installation shall be guaranteed against defective material or workmanship for a period of 12 months from the date the installation has been certified by the Engineer and taken over by the project. During the guarantee period, all the defects shall be rectified by the contractor, free of cost. 9. The successful tendered shall submit the drawings for the HT/LT boards to the Engineer for approval. The approval of these drawings will be general and will not absolve the contractor of the responsibility of the correctness of these drawings. At least 6 copies of the approved drawings shall be supplied to the Engineer for their distribution to various agencies at site at no cost to the Employer. 10. The successful tendered shall arrange water & power connection required for the work at his own cost. The contractor shall also install the tested meters at his own cost. The contractor shall pay the actual consumption at the supply company/agency rates. 11. The tenderers must see the site conditions and take account of all the aforesaid and foregoing factors while quoting the rates, as no extra will be allowed on any grounds arising out of or relating to the aforesaid and foregoing. 12. The successful tenderer shall include in his rates for painting with 3 coats of synthetic enamel paint to match the surroundings or as directed by the Engineer for all down rod hangers pertaining to light fixtures, fans etc. 13. The successful contractor shall supply completion drawings of the entire installation showing the complete wiring diagram as executed at site drawn to scale approved by the Engineer after the completion of work but before a completion certificate is issued. 14. The tenderers must include in their rates any fees to Govt. and arrange all sanction from the electrical inspector. 15. After laying and jointing the cables shall be subject to necessary tests as stipulated in IS No. 5959 (part-I), 1970. 16. The materials of the first preference shall be used and the contractor may excuse himself of not doing so only, if the required range, as per tender specification, is not manufactured by the particular manufacturer. The evidence of such case shall be supported by a letter from the respective manufacturer. All the samples of all electric fittings and other accessories shall be approved by the Engineer prior to their installation. 17. In cases where this specification and the description is the schedule of quantities differ, the work shall be carried out, as detailed in the schedule of quantities. 18. No alteration whatsoever is to be made to the text or quantities of this schedule of quantities, unless such alteration is authorized in writing by the Engineer. Any such alteration or additions shall, unless authorized in writing, be disregarded when tender documents are considered. 19. Any error in description or in quantity or omission of items from the contract shall not vitiate this contract but shall be corrected.

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20. All measurement shall be taken in accordance with the Indian Standard Electrical Installation in Buildings Method of Measurement of IS :5808: 1770, unless otherwise specified. External Power Line Connection from the NEA grid: NEA power grid at 11000 volts 3 phase will have to be tapped off from the roadside HT. overhead lines. The cost of HT. metering overhead lines and H-pole structure is considerably high. NEA central office should be contacted in time and some assistance may be officially requested for these scopes of works, still the total responsibility of connection and metering will be done by the contractor.

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ENVIRONMENTAL WORKS

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Technical Specification for Environmental works The compliance and requirements that the contractor must look after the waste management, noise, dust, and other pollution and environmental disturbance by the construction materials and construction works during the construction period should be as per UGC environmental guideline. Similarly, the precaution and management of sanitation, worker’s health and safety, health and safety of KU staff and students etc. should be as per UGC guideline. The construction specification must comply with the environmental safety and measures for Higher Education Institution, which the contractor must perform on his contraction. The contractor should fence the construction area and should not disturb the mobility of the students in the university during the transportation of construction materials. Likewise, the contractor should put the project description board mentioning the name and address of Project, Contractor, Employer etc. for detail explanation, and the Environmental Guidelines will be provided to the bidders along with the bidding document.

volii specification

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