Civil Constraction Method - Drainase

7/30/2019 Civil Constraction Method - Drainase

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PT. Rekayasa Industri

PROJECT : KUANTAN COMPRESSOR STATIONEXPANSION PROJECT

CLIENT : PETRONAS GAS BERHAD

LOCATION : KUANTAN, MALAYSIA

DOCUMENT NO. :

A PROPOSAL 21 MAY 2005 NSA NGS NGS

REV DESCRIPTION DATE PREPARED CHECKED APVD

169995815.doc

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METHOD STATEMENT FOR

DRAINAGE WORK


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AMETHOD STATEMENT FOR

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21 May 05 NSA NGSNGS

REVISION HISTORICAL SHEET

Rev No Date Description

A 21 May 05 Proposal

DISTRIBUTION ORDER

Internal Engineering (by EDO): Internal REKAYASA (by EDO): Externa l CONTRACTOR (by Transmittal, note-1):

Civil Lead Eng. Project Manager PGB (1+{1}) Copies

Electrical Lead Eng. Procurement Manager For Approval

Instrument Lead Eng. Project Control Manager For Review

Mechanical Lead Eng. Construction Manager For Info.

Piping Lead Eng. QA/QC Manager

Process Lead Eng.

Engineering Manager

Construction Document Control (Original)



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CONTENTS

SECTION PAGE

1. GENERAL

1.1 SCOPE 4

1.2 LANGUAGE 4

1.3 UNITS OF MEASUREMENT 4

2. APPLICATION STANDARDS & REFERENCES 4

3. PREPARATION 5

4. SETTING-OUT 5

5. EXCAVATION AND COMPACTION WORK 5

6. LEVELING CONCRETE AND SAND BEDDING 6

7. INSTALLATION OF PRECAST U-DRAIN 6

8. INSTALLATION OF PRECAST PIPE 6

9. BACKFILLING AND COMPACTION 7



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1. SCOPE

1.1 ScopeThis document describes the method of sewer & drainage work for KuantanCompressor Station Expansion Project of Petronas Gas Berhad, Kuantan,Malaysia.This method statement covers of following steps:

Preparation

Surveying

Excavation and Compaction

Leveling Concrete and Bedding Installation Pre-cast U-Drain or Pipe

Backfilling and Compaction

1.2 LanguageAll drawings, calculation sheets and documents shall be written in English exceptwhere government authorities demand the local language for their approval. Suchdemand shall be observed.

1.3 Unit of measurementUnit measurement in design shall be SI

2. APPLICABLE STANDARDS & REFERENCES

The requirements shall be carried out in accordance with the latest editions of thefollowing standards & codes.

1. Government Legislation

Malaysia Uniform Building by Laws

Urban Storm Water Management Manual for Malaysia, issued by Department

of Irrigation and Drainage, Malaysia

Jabatan Kerja Raya (JKR), Malaysia

Bekalan Air Johor (BAJ), Malaysia

Rules and Regulations for Electrical, Insulation, Suruhanjaya Tenaga, Energi

Commision

Jabatan Bomba dan Peyelamat

2. PETRONAS Technical Standard

PTS 34.11.00.11 Site Preparation and Earthworks

PTS 34.13.20.31 Road, Paving, Surfacing, Slope Protection and Fencing

PTS 34.14.20.31 Drainage and Primary Treatment System

3. PTS 34.28.00.31 Steel StructuresCODES AND STANDARDS

BS 8002 Earth retaining Structure

BS 6031 Code of Practice for Earthwork



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BS 6651 Code of Practice for Structural Earthing and Lighting

Protection

BS 5328 Methods of specifying concrete, including ready mixed

concrete

BS 5628 Code of Practice for use of Masonry

4. Final Factual Report of Soil Investigation Works for KUANTAN Compressor StationExpansion Project by Soil Centralab Sdn Bhd

5. SG.SP.EN.C-001 Engineering Design Basis for Civil and Structural

6. SG.SP.EN.C-003 Engineering Specification for Civil

2. PREPARATION

1) All materials to be used for this work shall meet the drawings and/ or specific jobrequirements. Catalogs and/ or samples of the materials shall be submitted toContractor and Owner for approval prior to commencement of the work.

2) Prepare the execution plan including all related man power and equipment to beprovided, schedule, and working drawing for following works.

3) Provide mix design concrete and conduct trial mix for all required grades of concrete

3. SETTING-OUTTo get the precise position of the drainage the following items shall be carried out.1) Set the alignment of centerline of drain by Subcontractor License Surveyor,

refer to reference drawings.2) Establish marking at the edge of intended drain line for indicating depth of

excavation as per reference drawings.

4. EXCAVATION & COMPACTION WORK

In order to get properly earth work execution the following activities are required:1) Excavate existing soil to get intended elevation of drainage using backhoe

loader and manual labor.2) Soft soil, obstacles and other unsuitable material that encountered in the sub-

grade shall be removed and replaced with suitable material as approved by Contractor.Compaction of replacement materials shall be as specified in ConstructionSpecifications for Earthworks.

3) Once the formation level is achieved, the bed of excavation shall be compactedimmediately.

4) The slope and shape of excavation of the drainage shall be such to minimizeerosion and sedimentation.

5) All excavations shall be provided with stable side slopes to minimize slopecollapse and to ensure safety at all times.

6) Part of excavated soil to be dumped offsite and the remaining quantity to beused as backfilling materials. Excavated material must be stacked at least 1.2 m clear

of edge of trench.



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7) Provide a red safety tape surrounding excavation pits as safety measure. Hardbarricades shall be provided where necessary.

5. LEVELING CONCRETE & SAND BEDDING

The following activities shall be performed:1) The intended level of bottom of excavation to be checked and hand compacted prior to

laying of concrete for pipe culvert and prior to laying of sand for manhole or precast U-ditch/ box culvert.

2) Inspect level and depth of the excavation by Subcontractors QC, withnesses byContractors QC.

3) Install sufficient wood at boundary of leveling concrete or sand bedding if necessary.4) Apply and compact sand bedding for manhole and RC pipe culvert.5) For pipe culvert installation, in accordance with paragraph 4.2.2.3 of Construction

Specification for Sewer and Drainage, bedding shall consist of grade 20/ 20 concretereinforced with a layer of wire mesh no. A8, unless specified otherwise on the drawings.

6) For manhole, a layer of 50mm thick of sand shall be used for as pipe bedding, asshown on the drawings.

7) The sand bedding must be compacted using approved compactor. Inspect the beddingbefore lying of drain.

8) Check level, thickness and compaction of sand bedding by Subcontractors QC andContractors QC.

9) Pouring ready-mix concrete for leveling concrete. Leveling concrete is applied for U-

ditch, manhole , road crossing culvert and where specified.10) Compact and level the concrete using manual tools.11) Check level and thickness compaction of lean concrete by Subcontractors QC and

Contractors QC before laying of precast drain or manhole.

6. INSTALLATION OF PRECAST U-DRAIN

1) Make sure the drain to be used is of the approved type and manufactures and checksize and dimension of material by Subcontractor QC and Contractor QC.

2) Ensure that Inspection Release of sand bedding is achieved.3) Mark center line of drain using peg and string.4) Lay the drain from higher end to lower end.5) Check the invert level of the drain and record it section by section by Subcontractor QC/

Surveyor witnessed by Contractor QC. The tolerance for invert level is+10mm6) All joints between the pre-cast units shall be filled with 1:3 cement mortars.7) Joint inspection for drainable slope of drainage partially between Subcontractors QC

and Contractors QC.

7. INSTALLATION OF PIPE CULVERT

1) Make sure the drain to be used is the approved type and manufacturer andcheck size and dimension of material by Subcontractor QC and Contractor QC

2) Pipe culvert for road crossing normally installed is of spigot and socket typeunless specified otherwise.

3) Make sure that bedding has been accepted including its elevation prior toinstallation.

4) Pegging area of drainage to guide centerline, elevation, and left-right border asnecessary.



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5) Provide a recess on the bedding material to accommodate the socket. The widthof the recess of the socket by more than 50 mm.

6) Pipes shall be laid in upstream direction with the socket towards the inlet.7) Check the alignment of pipe or drainage section by section, partially, by

Subcontractor QC and witnessed by Contractor QC.8) Prior to jointing, rubber rings and jointing surfaces shall be cleaned of all

contaminants.9) Rubber ring joints shall be installed strictly in accordance with the manufacturers

instruction.10) The care must be taken to ensure the rubber ring is adequately compressed to

seal the joint.11) Inspect joints by Subcontractor QC or Supervisor and witnessed by Contractor

QC.12) After all pipes for certain section of road crossing is completely installed, the

survey on the intended invert level of the pipes to be checked and must be within thetolerance given in the specification before the backfilling can be started.

13) Joint inspection for drainable slope of drainage between Subcontractors QC andContractors QC.

14) Subcontractor shall submit details of proposed methods and program for testing,including details of test equipment, for Contractors approval and shall arrange for alltest to be witnessed by Contractor.

8. BACKFILLING & COMPACTION WORK1) For pre-cast U-drain the backfilling material is taken from the original suitablematerials.

2) Use approved compactor to compact the backfilling material.3) For pipe culvert on road crossing, sand to be used as backfilling material until

150mm (or as specified) above pipe top level, then suitable materials from the originalground to be used to complete the backfilling.

4) Backfilling material shall be compacted layer by layer not exceeding 200mm inthickness as specified in the Construction Specification for Earth Work to achieve thespecified compaction requirements.

5) The final layer of soil is compacted together with road sub-grade material.6) Inspect filling and compaction work by Subcontractor QC and Contractor QC.

7) Cleaning-up and tidy-up.


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Civil Constraction Method - Drainase