Method Statement for GRP Pipes Laying with Granular Surround

CONTENTS

1. Scope of Work

• Definitions

• References

• Subcontractors

• Materials

• Plant  & Equipment

• Safety

• Prior Activities

• Procedure

1. Responsibilities

1. Attachments

1. Scope:

1.1	This Method Statement covers the laying of GRP Pipes with Granular surround.

2. Definitions:

2.1	MS: STM Method Statement : Storm Water Drainage Work
2.2	ITR  Inspection and Test Request
2.3	PPS   Particular Project Specification
2.4	GPS   General Project  Specification
2.5	UG   Underground
2.6	TPS    Technical  Project Specification

 3. References:

3.1	Contract drawings No. PGAD 745/1008/C/927, C/928,C/929 ,and PGAD745/1008/C/901 to C/907 REV(A) and related schedules.
3.2	TPS   Section 901: Clause 901.2.5 Pipe Work
3.3	TPS    Section 901 Construction of Pipework and Manholes: Clause 901.4.3 & 901.4.5.
3.4	MS   STM-01 Surveying
3.5	MS   STM -02 Dewatering
3.6	MS   STM -03 Earthworks
3.7	Material Submittal MSF-INF-003-R0 GRP Pipes and fittings (Future Pipes Industries)

4. Subcontractors:

4.1	GRP Pipe suppliers to conduct Deflection Test.

4.2	Pipe laying and installation will be carried out by Odebrecht-Al Jaber Joint Venture. No sub-contractor will carry out the GRP Pipes laying.

5.  Products:   

5.1	GRP Pipes, dia (400mm to 1500mm).
5.2	Rubber gasket rings of approved source
5.3	Warning  tapes of approved source
5.4	Lubrication soap for rubber rings
5.5	Granular material

6. Tools & Equipments:

6.1	Dewatering Equipment
6.2	Excavators
6.3	Front End Loader (Shovel)
6.4	Tipper Trucks
6.5	Crane (if required).
6.6	Flat-bed truck and trailer
6.7	Concrete Mix Trucks
6.8	Small Vehicles
6.9	Compactor (Plat or Roller)
6.10	Concrete vibrator
6.11	Surveying Instruments
6.12	Nylon lifting slings
6.13	Cable pullers (come-along)
6.14	Ladders
6.15	Concrete Barricades
6.16	Flagging Tape/Warning Tape
6.17	Concrete Formwork
6.18	Concrete Temp. Gauge
6.19	Slump cone, cube moulds
6.20	Electronic deflectometer

 7. Safety

7.1	PPS Section100: Clause 100.2 Airport emergency and safety.
7.2	GPS. Section102: Clause 102.11,12,14 General and preliminary.
7.3	CSM Construction Safety Manual
7.4	OAJ-JV Safety Manual.
7.5	Safety Hazards and Precautions
	a)- Strike UG Services:   Use Locator and/or hand excavation (trial holes)
	b)-Excavation Collapse:   Batter sides to safe slope or provide shoring (as directed by                             Geotechnical Consultant) and subject to Engineer’s approval   Keep vehicles/equipment safely away from excavation edge   Keep spoil at least 2.0 meter away from edge   c)- Fall into excavation:   Provide fencing, guardrails or flagging tape around edges.   Provide safely fixed (every 50m)   Provide banks man when operating equipment near excavation.   d)-Crane Accidents:     All cranes checked and certified     Operators professional and well experienced     Provide banks man when operating near excavation     Check load indicator, slings and wire ropes daily       e)- Falling Objects:   Stand clear during lifting operations   Wear hard hats   f)- Equipment & Vehicles:   Use Safety belts   Slow down and obey speed limits   Provide “back-ups” alarms   Provide banks man when operating equipment near excavation.   g)- Confined Space:   Check air with gas monitor before entering assembled pipeline or manholes             Check air in deep narrow trenches or excavated before entry.
	Check excavations for snakes and scorpions before entry
	Take precautions against flooding
	Develop rescue procedures

8. Prior Activities:

8.1	Calibrate Instruments: All instruments will be provided with Calibration Certificates prior to commencement of the works with validity of minimum 6 months.
8.2	Check for Existing Utilities before Excavation (Trial Holes)
8.3	Check all pipes free of cracks and chips or damage to liner.
8.4	Prepare and get approval of Shop Drawings.

 9. Procedure:             

9.1	Prepare Shop Drawings and submit to the Consultant to get approval prior to starting any excavation works.
Note:	Only the drawings marked as approved  “Issued for Construction” are allowed to be used by the Site Staff.
9.2	Survey will be conducted according to MS – 1005.
9.3	Dewatering will be conducted according to MS – 1004.
9.4	Excavation will be conducted to the proper formation level according to MS – 1008.
Note:	The Consultants Inspector will be notified if any areas are over excavated or unsuitable materials are encountered, in which case replacement material will be used (refer to MS – 1008)
9.5	The trench formation shall be compacted to 98% MDD, or bearing value.
9.6	The formation level will be to the required lines and grades as detailed in the approved Shop Drawings.
Note:	Formation compaction is a Hold Point and will be confirmed by the Consultants Inspector before proceeding with blinding concrete.
9.7	Granular bedding material of approved gradation will be spread and properly compacted as per specifications.  Pipes are then lowered and installed in the trench to the required line and grade. Transportation, handling, installation and storage of GRP pipes and fittings will be strictly conducted according to the manufacturer’s instructions.
Note:	The pipe installation is a hold point and lines and levels must be checked and approved by the Consultant’s Inspector before other work proceeds.  Any adjustment in the line and grade shall be made by scrapping away or filling and tampering in under the Barrel of the pipe.
9.9	Pipeline is then visually checked by torch and mirror

Deflection Test:

9.10	Deflection Test will be performed by the pipe manufacturer using an approved electronic deflectometer (Refer to Manufacturer’s installation guide, Section 7, Pipe deflection, page 34).
9.11	Deflection Test will be conducted by the manufacturer according to the latter’s and Project Specifications.
Note:	Deflection measurements shall be taken under the Supervision of the Engineer.  A joint record shall be signed by both parties and a copy submitted to the Engineer for future reference.
9.11	Pressure Test will be carried out as per specifications section 901.5 clause 901.5.1

 Backfilling:

9.12	Backfilling will proceed in layers in accordance with MS-1008.
	By hands to a level 500mm above the crown of pipe.   With rollers or plate compactors up to the final ground level.

 10. Responsibilities:

10.1	It is the Contractor’s Site Manager’s duty to ensure that all necessary safety and protective equipment are provided along with properly Trained and qualified personnel.
10.2	It is the Site Supervisor’s duty to organize the work in a safe manner to ensure that safety and protective equipment are being properly utilized.  He must also assure the method statement procedure is followed and must observe the Hold-points and notify the Consultant for inspection.
10.3	It is the worker’s duty to properly wear the protective equipment Provided and obey all safety rules.  He must also perform the Work as described in the method statement procedure..
10.4	The Site Engineer will ensure that the site preparation activities are conducted according to the approved method statement.
10.5	The Material Engineer will ensure that the materials being used are in accordance to the project specifications and the approved method statement.