einrip projects construction kesatu-rachmat agus · pdf filediscussion issues that apply to...
TRANSCRIPT
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