EINRIP

Specification and Construction Issues

There are a significant number of gchanges in the Specification

Not all issues can be discussed hereNot all issues can be discussed here

A more detailed list of changes will be gprovided with bid documents

The specification is based on the SRIPThe specification is based on the SRIP Specification with amendments

Changes have been discussed and gapproved* in three workshops and by

BINTEK Standards Sub DirectorateBINTEK Standards Sub Directorate

*Except for rigid pavement which still requires final concurrence

The presentation aims to give bidders a taste of what to look for when estimating unit prices for g p

EINRIP projects.

The underlying message should be clear:

Bidders should carefully review the S ifi ti D i d BiddiSpecification, Drawings and Bidding

documents and must ensure that t d d U it P i t ftendered Unit Prices account for Specification and policy changes

This is not a Pre Bid Meeting

Individual projects will not be discussedIndividual projects will not be discussed

Discussion issues that apply to all projectsDiscussion issues that apply to all projects should be self evident

The drawings and BOQs define specific project issuesp ojec ssues

DESIGNDESIGN REVIEWREVIEW

D i f ll d t il d Th fDesigns are fully detailed. Therefore “FIELD ENGINEERING” and Design R i i t ill diff fReview requirements will differ from

the past.

Clause 1.9.2

The Field Engineering review period is limited to 30 days afterperiod is limited to 30 days after mobilisation.

Only minor design revisions are itt dpermitted.

Clause 1.9.2 Field Survey for Minor R i iRevision:

“the Contractor shall locatethe Contractor shall locate and propose corrections for errors and omissions theerrors and omissions …the

Engineer shall make ti dcorrections and

interpretations deemed necessary”

SUPERVISIONSUPERVISION

General Conditions of Contract:

FIDIC Harmonized Version

Engineer:

RSC Team Leader

QUALITYQUALITY

A SIMPLE RULE FOR EINRIP PROJECTS:

SPECIFIED

QUALITY STANDARDS

MUST BE ACHIEVED

THERE WILL BE INDEPENDENT AUDITS SPONSORED BY THE

LENDING AGENCY

Contractual and specifiedContractual and specified sanctions will be enforced if

specified quality is not delivereddelivered

BIDDERS MUST HAVE A QUALITY ASSURANCE PLANQUALITY ASSURANCE PLAN

AND MUST BE SERIOUS ABOUT DELIVERING SPECIFIED

QUALITY

There will be ZERO TOLERANCE f f l l b t t t dfor false laboratory test records.

False records can be identified by i bl d t ttrecognizable data patterns

Quality Managers must not

tolerate such practices

SURVEY AND SUTOLERANCESTOLERANCES

The drawings provide complete alignment and

level data

Construction tolerances are realistic and in some cases less stringent than gin past Specifications – they must be

adhered to

Example: grade finished level(or sub grade)(or sub grade)

Reference Relative to Reference absolute level

SRIP Clause 3 3 1 (3) (a) (sub grade) +1 cm -1 cmSRIP Clause 3.3.1 (3) (a) (sub grade) +1 cm -1 cm

EINRIPbased on “Survey Standards, Setting Out and

Earthworks Measurements”(R t f j i t IHE d ICE (UK) W ki P t

+2 cm -3 cmLess stringent but(Report of a joint IHE and ICE (UK) Working Party,

1982) Table 4.1Less stringent but

achievable and will be enforced – needs

SETTING OUT pegs

A qualified surveyor preferably equipped with a Total Station

must be provided to set out the pworks

Specified construction tolerances pmust be achieved to satisfy layer

thickness, riding quality,thickness, riding quality, appearance and other objectives

BRIDGE TYPESTYPES

The following bridge structure dtypes are used:

• Integral abutmentg• Pre-stressed Beam • Steel truss

NEW • Steel truss• Multi cell box culvert

TYPE

AGGREGATE GG GAND SANDAND SAND

A 3 stage crushing plant is g g prequired to achieve the

specified aggregate shape forspecified aggregate shape for more heavily trafficked

projects

EBL 01 EBL 02 EKS 01EBL 01, EBL 02 , EKS 01

Aggregate sizes for ACNEW SCREEN SIZE FOR AC Aggregate sizes for AC

30 – 20 (only if AC BASE USED)

BASE (if used)

30 20 (only if AC BASE USED)20 – 1414 5 ( 7)

New screen sizeFor AC wearing14 – 5 (or 7)

Abu batu

For AC wearing

Therefore preferable to have a 4 deck crusher plant screen deck if AC Base iscrusher plant screen deck if AC Base is produced

Sand WashingSand Washing

• Sand Equiv 75 specified for heavy trafficSand Equiv 75 specified for heavy traffic asphalt

• Sand for concrete <3% pass 75 micron• Sand for concrete <3% pass 75 micron washedTHEREFORE A SAND WASHING PLANT• THEREFORE A SAND WASHING PLANT WILL BE NEEDED FOR EBL 01, EBL 02, EKS 01 tEKS 01 etc

TRANSPORTTRANSPORT OFOF

MATERIALSMATERIALS

All trucks shall be l ll l d dlegally loaded –

overloading will not beoverloading will not be permittedpermitted

Bids must allow for legal gloadingeg Clause 6 3 4 9 (a)eg Clause 6.3.4.9 (a)

Extra for Haulage of Excavated Materials in excess of 5 kmin excess of 5 km

Pay Item: 3.1 (9)

Problem : a) BOQ quantity not possible without contractors work plan - ??

b) contractors responsibility to find most efficient work plan

c) big problem for Engineer to decide “NECESSARY” long haulage for payment and keep balanced budget

SOLUTION: Delete Pay Item 3.1 (9) , (Item 7.15.10 still exists for bridgeworks)

THE PAY ITEM FOR HAULAGE OVER 5 km IS NOT AVAILABLE

FOR EINRIP EARTHWORKS DIVISION 3 (ONLY FOR STRUCTURES

DIVISION 7)

BIDDERS MUST ESTIMATE HAULBIDDERS MUST ESTIMATE HAUL LENGTHS AND ALLOW FOR

TRANSPORT COST IN OTHERTRANSPORT COST IN OTHER UNIT PRICES

DRAINAGEDRAINAGE

• Full design includes invert levels

• Drains must be built to correct invert levels and gradientsand gradients

S ifi ti i d i t b• Specification requires drains to be installed before earthworks

• Therefore maximum use of pre cast l t i d d t i i ielements is recommended to minimise

delay

EARTHEARTH

WORKSWORKS

Some projects require heavy earthworks to improveearthworks to improve alignments. g

A vibrating pad foot roller may g p ybe required

Pantura and EKS 02 – 5 problems

• OVERLOADINGSOFT SOIL• SOFT SOIL

• WATER

soft soilEINRIP Section 3 1 2 5EINRIP Section 3.1.2.5

Saturated Silty Clay problem (EKS xx projects) :

• Usually high moisture content prevents compaction. Therefore AASHTO CBR test is inappropriate to determine sub grade value forinappropriate to determine sub grade value for tropical silty clay

• Actual CBR on site for saturated silty clay << 2%y y• Field CBR for saturated silty clay must be based

on DCP or soil properties, not on AASHTO CBR• Requires capping layer of 0.5 to 1.0 meter to

develop an equivalent CBR 2 bearing capacity

Typical flexible pavement structure for saturated soft soil sub grade eg EKS 02 - 05

CBRAsphalt varies

Aggregate base A 20 cm15

CBRAsphalt varies

Aggregate base B 20 cm

Selected embankment 30 cm

6180 +

Aggregate base B 20 cm

Selected embankment 30 cm

2

80cmTypical wet

season standing water level

Lower capping layer (granular) 100 cma e e e

Insitu subgrade <<

2%2%

EINRIP earthworks measurement ROCK AND COMMON

EXCAVATION

+ design reconnaissance

bore holes at deep cuts to assess rock

Surplus to embankment demand etcor declared unsuitable

Used in embankment (or other project applications)or declared unsuitable other project applications)

PAY ITEMS: PAY ITEMS:PAY ITEMS:Rock and Common

Excavation

PAY ITEMS:Rock and Common Excavation

Common Embankment

Unsealed shoulder material (Class S)Unsealed shoulder material (Class S)

• Class B problems as shoulder– Erodes easily y– permeable

safety problem for motor bikes– safety problem for motor bikes

• Class S = approx SRIP unsealed road gravel Class C

ASPHALTASPHALT

• Refer recent BM/EINRIP Asphalt workshop • Filler silo required• AMP 60 tph required for AC• Additional equipment

– Power broom– 2 sprayers with spray bar– Waterpass for crossfall– Other – see spec

14 and 30 mm hot screens– 14 and 30 mm hot screens

PAVEMENTPAVEMENT STRUCTURESSTRUCTURES

• Asphalt OverlayAsphalt Overlay• Rigid

R t ti• Reconstruction• Heavy patching• Recycling• Full constructionFull construction• Grade raise

Pavement design principlesPavement design principles• Real axle loads• 15 year design for asphalt • 40 year design for sub grade• 40 year design for sub grade• Test pit analysis if BB > 2.4 mm• Minimum CBR 15 granular base support• Reconstruct if AC thin and failed, BB > ,

2.4 and granular base quality is poor

Typical full construction (CIRCLY)T ffiTraffic ESA million (5th power)

<1 <2 <5 <50 >50

HRS 6.5

AC (f) 10 24AC (f) 10 24

AC (c) 22.5rigid

Cement treated base 20baseunbound Base 40 40 40 20 20

Typical existing structure yp gof local roads upgraded to

National and requiringNational and requiring reconstruction

Asphalt 8 – 15 cm cracked

Si t 15 30Sirtu 15 – 30 cm

Reconstruction process: p

1 remove asphalt – (if milled it can be reused)

Reconstruction process: p

2 Excavate widening to sub grade –

( excavated material used as embankment if suitable )

Reconstruction process: p

3 Trim to final sub base level or

lower – cast surplus to widening

Reconstruction process:

4 Make up to design sub base level

with new material and compact

existing and new in 20 cm layers

Reconstruction process: p

5 Place and compact new pavement

layersAsphalt variesp

Aggregate base A 20 cm

Reconstruction process: p

6 Use milled asphalt as specified

Asphalt variesAsphalt varies

Aggregate base A 20 cm

ROAD SIDEROAD SIDE FURNITUREFURNITURE

ETCETC

• New guard rail end typesNew guard rail end types• Semi mountable curb for safety and

aesthetic reasonsaesthetic reasons• Grated pit entries for drainage• Invalid ramp for curb lines at intersections,

pedestrian crossings and bus stops• other

Vehicle accessesVehicle accesses

Will b id d t ROW li• Will be provided to ROW line• Usually not shown on plan• Standard or special drawings will be

providedp• Mountable curb used when private access

spacing less than 10 metresspacing less than 10 metres

CONCLUSIONCONCLUSION

• Quality standards will be enforcedQuality standards will be enforced• There are a number of changes in the

SpecificationSpecification • Certain additional equipment items

t b id d ti l l fmust be provided particularly for heavily trafficked roads

• Take account of these factors when pricing bids