METHOD STATEMENT FOR PILING WORKS (OVERCROSSING PIPE) PROJECT: PACKAGE 3-CONSTRUCTION AND COMPLETION OF 9ML BUKIT TAISHO RESERVOIR, SUPPLY AND LAYING OF MILD STEEL PIPES TO BUKIT GENTAM RESERVOIR
A. OBJECTIVE 1) To outline the sequence of work or construction methodology for Piling Works at Sg Jempol, Sg Pelangai and Sg Jemapoh .Methodology starts from survey setting out until excess pile cutting until as-built drawing submission for Consultant review. 2) To outline preparation or coordination required before start work 3) To outline quality plan or inspection test required during project implementation. 4) To perform safe working environment and compliance to the safety requirements. B. SCOPE OF WORK In general scope of work for this work method statement cover the following:Scope of Works Piling Works (Drop hammer method) Methodology starts from pile position setting out until asbuilt preparation for Consultant review.
Descriptions / Details Piling Works (Drop Hammer Method) consist of the following items; Soil Investigation Survey Setting Out Pile Driving and Pile Jointing (welding) Piling Records Pile Cutting As-built (Actual Piles Position) Prepared by Surveyor
C. REFERENCES BS 8004- Foundation
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METHOD STATEMENT FOR PILING WORKS (OVERCROSSING PIPE) PROJECT: PACKAGE 3-CONSTRUCTION AND COMPLETION OF 9ML BUKIT TAISHO RESERVOIR, SUPPLY AND LAYING OF MILD STEEL PIPES TO BUKIT GENTAM RESERVOIR
D. RECOURCES PLANNING Material Planning Item Material Descriptions 1 R.C Pile (250 x 250) 2 Pile Head / Pile Toe for pile joints Manpower Planning Ite m 1 2 3 4
Machinery & Equipment Descriptions Drop Hammer Pile Cutter Machine Mobile Crane Welding Machine with welding consumable
E. MATERIAL HANDLING & DELIVERY INSPECTION Material Handling a) RC Pile (Square/ Spun Piles) All material shall be loaded and unloaded with care by mobile crane or other type of suitable machinery to avoid pile damaged. Materials shall be placed where the materials are not obstructing the main road access in order to prevent material double handlings. b) All material shall be stacked on top of the piece of timber with proper timber shim to prevent material damaged or easy material lifting. Material Delivery Inspection: Checking Methodology Material
RC Pile (Square/ Spun) and others accessories
Items to be Checked or Inspected R.C Pile shall be: Correct Specification/ Grade Correct Size Material delivered in good condition, no damaged. All accessories shall be available and ready for use.
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Method of Inspection
Visual Check & Random Sampling
METHOD STATEMENT FOR PILING WORKS (OVERCROSSING PIPE) PROJECT: PACKAGE 3-CONSTRUCTION AND COMPLETION OF 9ML BUKIT TAISHO RESERVOIR, SUPPLY AND LAYING OF MILD STEEL PIPES TO BUKIT GENTAM RESERVOIR
F. COORDINATION BETWEEN OTHER TRADES 1) Coordination between Others Architecture Trades (NOT APPLICABLE) 2) Coordination between Others C&S Trades (NOT APPLICABLE) 3) Coordination between Others M&E Trades (NOT APPLICABLE)
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METHOD STATEMENT FOR PILING WORKS (OVERCROSSING PIPE) PROJECT: PACKAGE 3-CONSTRUCTION AND COMPLETION OF 9ML BUKIT TAISHO RESERVOIR, SUPPLY AND LAYING OF MILD STEEL PIPES TO BUKIT GENTAM RESERVOIR
G. WORK METHODOLOGY
1) Soil Investigation 2) Survey Setting Out (Pile Position) The surveyor will set out the alignment of the pipe by means of EDM using the marking on the piles and the pump house as a reference point. Lower down the pile into position as in above step by using crane mounted piling frame and adjust the position and vertically of the pile with the aid of the surveyor. Liaise with Consultant or Client representative to conduct joint inspection. 3) Pile Driving and Pile Jointing The steel pipe piles will be sand blast to removed dirt & grease on the pipe then a layer of hot bitumen coating will be apply on the body of the piles. Piles shall be driven by using 1.5 tonne drop hammer type by follow the Calculation of Setting. Positioning Pile Machine: Piling base machine shall be placed manoeuvre to align with the piling points. Placement of the Pile: the initial pile segment is pitched using a low speed hydraulic winch and then the pile is placed into the guide or chamber of the piling machine. Pile is driven into the ground by the drop hammer. The driven pile should be maintained straight in line at all the times. Piles should not deviate more than 75mm from their designed positions as at the working level of the piling rig. Extension Pile: When the initial pile segment is driven close to ground, operator shall stop driving and install the second piles into the position for jointing. Pile shall be jointed by using welding the mild steel plate between piles. Continue Pile Driving Process until Set. Pile driving process repeated until the required resistance to pile penetration is achieved, or the required pre-determined penetration depth is reached. The setting is achieved when the set taken for the final 10 blows of the hammer is within the set as calculated. (Refer calculation attach) 4) Piling Records All the pile reading shall be recorded in the “Pile Record Form”. All pile records shall be checked correct and signed by relevant C&S consultant or Client representative. 5) Pile Cutting Excess piles length shall be cut according to the piling CutOff-Level. 4
METHOD STATEMENT FOR PILING WORKS (OVERCROSSING PIPE) PROJECT: PACKAGE 3-CONSTRUCTION AND COMPLETION OF 9ML BUKIT TAISHO RESERVOIR, SUPPLY AND LAYING OF MILD STEEL PIPES TO BUKIT GENTAM RESERVOIR
Suitable type of pile cutter machine shall be used to ensure pile not damaged during pile cutting process. All the excess piles shall be collected and removed away from site.
6) As-built (Actual Piles Position) Prepared by Surveyor Actual piles position shall be recorded by surveyor in the survey book. From the actual data taken at site, surveyor will plot the Pile As-built Drawing for C&S Design Consultant review. If any piles out of construction tolerance (the piles should be driven as accurately as possible to vertical or the specified rake- piles should not more than 75mm from their design), rectification shall be carried out according to C&S Design Consultant instructions.
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METHOD STATEMENT FOR PILING WORKS (OVERCROSSING PIPE) PROJECT: PACKAGE 3-CONSTRUCTION AND COMPLETION OF 9ML BUKIT TAISHO RESERVOIR, SUPPLY AND LAYING OF MILD STEEL PIPES TO BUKIT GENTAM RESERVOIR
H. QUALITY: INSPECTION & TEST PLAN Inspection & Test Plan No
Stage of Work
1
Material Selection
2
Sample Submissio n (If applicable )
3
4
5
Material Delivery Survey Setting Out (Boundary / pile position pegs) Pile Jacked In ( Drop Hammer Method)
Frequency
Once
Once
Checking Required Check material to be used (Grade/ Size): RC Piles either square piles or spun piles Material Product Brochure submission approved by Client
Method
Acceptance
Review Catalogue or relevant test certificate
Material as per Project Specification/ Requirements
Sample Submission Form / Letter
Approved by Client Material as per spec, good conditions and no damaged.
Every Delivery
Material delivered as per material order, No Damaged (Quantity, Quality & Spec)
During Survey Setting Out
Mark and Check: Building Boundary Pile Position Pile (Cut-Off – Level)
Visual Check Pegs per & Random construction Measureme drawing nt
Pile driving as per construction Visual Check drawing and visually straight alignment
During Pile Jacked In and Pile Jointing
Check the all in straight alignment and joint satisfactorily done Ensure all pile records in “Pile Records Form” 6
Random Sampling Check
Visually straight alignment Visual Check and pile joint was satisfactory done Visual Check Proper & Recorded records with authorized
METHOD STATEMENT FOR PILING WORKS (OVERCROSSING PIPE) PROJECT: PACKAGE 3-CONSTRUCTION AND COMPLETION OF 9ML BUKIT TAISHO RESERVOIR, SUPPLY AND LAYING OF MILD STEEL PIPES TO BUKIT GENTAM RESERVOIR
signature
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Upon completio n of piling works
Pile Cutting
As-Built: Data & Info: plotting and Consultant submissio n
Upon completio n of pile cutting
Check the following: All the piles shall be cut follow the marked “CutOff-Level” Suitable machine Surveys pick up info and data for AsBuilt drawing preparation and submission. As-built review by C&S Design Consultant
Visual & Measured
Field Survey and plotting Review AsBuilt Drawing
Pile cutting as per “Cut-OffLevel” and suitable pile cutter machine, No pile damaged.
All piles within construction tolerances/ Acceptable by Consultant
Relevant Construction Standard & References NIL QC Documents or Relevant Checklist Attachment B: Inspection Checklist for “Pile Records Form”
I. OCCUPATIONAL SAFETY AND HEALTH (OSH) All occupational safety and health (OSH) measures shall be as per FACTORY AND MACHINERY ACT 1967 under: Building Operation and Works of Engineering Construction” (BOWEC) Safety Regulations 1986. Relevant Regulations – further details please refer to the following regulations: Part II : General Provision Part XII : Excavation Work Part IX : Material Handling and Storage, Use and Disposal Part XVI : Hand and Power Tools
J. ATTACHMENT
Appendix A : Inspection Checklist for “Pile Records Form”
