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PRECAST PILE

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Technical Proposal

Method Statement OF PILES, TRANSPORTATION, DRIVING, AND WELDING WORKS

INTRODUCTION

This work method statement is to provide a method for Installation of pre-cast pile construction.

The Purpose of This Work Method Statement is to give a precise guide on how the work will be executed and to ensure that the work is performed with respect to Health, Safety, and Environment, and Quality standards.

This work method statement:

  • Outlines a safe method of work for the specific job
  • Provides an induction document that workers must understand before starting this job
  • Meet safety, quality, and environmental (legal) requirements
  • Program work, materials, time, staff, and to anticipate possible problems
  • Will be used as a tool for quality assurance.

DEFINITION AND ABBREVIATIONS

  • IROS: IRAQ RESERVOIRS OIL SERVICE COMPANY LTD
  • WMS: Work Method Statement
  • SOW: Scope of Work
  • ITP: Inspection and Test Plan
  • JSA: Job Safety Analyses

MATERIALS

  • Precast Pile Size:( 400 mm x 400 mm).
  • Pre-cast pile size (285 mm*285mm)

MACHINERY AND EQUIPMENT

The following list of Major machinery shall be used for the Piling work:

Driving Pile Rig with Hammer

-5 unit

Crawler Crane / Service Crane

-5 unit

Mobile Crane

-1 set

Welding machine (with Portable Elec. Generator)

-1 set

Surveying Instrument

-1 set

Hand Tools

-1 set

All heavy-duty machinery and equipment shall be inspected before mobilize to the site area conducted jointly by Uruk and AFP at the designated area. Uruk will attend joint inspection only after AFP has certified that equipment complies with contract requirements.

MANPOWER

Two (2) teams of crews are involved in the operation, namely piling crews consist of piling operator and welder and, lifting crews consist of the service crane operator, rigger, and signalman. The lifting crews may service other activities when not require in piling operation. The additional task descriptions for the key personnel are:

  • The Crane and Piling Rig Operator
    • Carry out a daily pre-operation inspection on the crane and its safety devices. Record observations and deficiencies in the crane logbook.
    • Report any deficiencies to the lifting supervisor and ensure that they are rectified before any lifting operation is carried out.
    • Ensure that the crane is level and secured before performing any lift.
    • Ensure that the body of the crane is properly landed on the ground and stable.
    • Ascertain that the ground conditions are adequate for the lifting operation. Steel plates may be used for lifts if necessary.
    • Know the load to be lifted and ensures that it is within the safe working load of the crane for the corresponding boom length and lifting radius.
    • Identify this by means of a lifting check sheet with weight to be lifted noted on the sheet.
    • Be aware of any special operational requirements or limitations imposed.
    • Ensure the load is lowered down in a safe way, do not suddenly release the load.
    • To sound horn so as to warn or inform others that lifting operation is in progress.
    • Ensure that there is no obstruction in the path of the maneuver of the Crane and if there is any such obstruction, he shall report such obstruction to the lifting supervisor or Safety supervisor before the lift.\
  • Piling Crew (Piling Worker combine with Rigger, Signalman, and Welder)
    • Wears Green with reflective strips vest and “RIGGER” written on the back, and red helmet.
    • Selecting the correct lifting gears and equipment.
    • Safe rigging of the load to be lifted in accordance with the safety plan.
    • Attaching and detaching the load to and from the crane.
    • Wears Green with reflective strips vest with “SIGNALMAN” written on the back, and red helmet with two (2) blue bands.
    • Ensure or verify with the rigger that the load is properly rigged up before he gives a clear signal to the crane operator to lift the load.
    • Give a correct and clear signal to guide the crane in the maneuver of the load safely to its destination.

WORK PROCEDURE

  • Setting-Out of Pile Positions
    • Field Surveyors set out site boundary and project gridlines, followed by the pile position with reference to Corner Pegs, Control Datum Reference on-site, the Pre-computation Setting out Plan and Pile Layout Plan.

  • Driving of Piles
    • Before the driving commences, grid lines, pile numbering, AGL, and pile position will be checked by the surveyor.
    • The Centre of the gravity of the steel plate is to be determined and must be the hoisting point for the auxiliary line of the piling rig.
    • Using Piling Rig lift the metal/steel plates, to provide a good base for its proposed Rig standing location. Dragging more than 5m is not permitted.
    • PC Pile segments are pitched into a vertical position and the piling worker checked for pile verticality and plumb in 2 adjacent directions using a spirit level.
    • The driving process begins with the first pile segment, where the hammer stroke gradually increases as the ground resistance increases until the maximum of the recommenced stroke height at final resistance (measured by ‘set’).
    • All pile sections to be used shall have legible markings at approximately every 500mm interval throughout the entire pile segment. Additional marking of 250mm intervals will be provided for the last 1m of the driving pile.
    • During driving, the pile head shall be protected by a mild steel helmet closely around the pile required to set, except when welding (required to be cooled down) is carried out between pile joints.
    • Driving will stop at approximately 500mm to 800mm above ground level to allow welding works.
    • All piles shall be driven to set based on a Hiley’s Formula (adopted FOS 2.5), of which the suitability shall be ascertained from the installation of a preliminary pile and subsequent load-testing. All pile load testing criteria (Kentledge and PDA) shall conform to SS CP4:2003.
    • The maximum length of each pile section to be used shall not be more than 12 m. The minimum length to be used shall not be less than 4 m.
    • 4.0mm diameter approved brand electrodes shall be used in welding all splicing joints in accordance with the manufacture’s specification.
    • All welding electrodes will be stored in a cool dry place. A portable heater will be used to heat up electrodes prior to welding.
    • All welding work shall be carried out by a Qualified Welder.
    • Welding procedures will be submitted to SECL for approval prior to the commencement of welding work.
    • A steel extension (dolly) may be used when necessary. When a dolly is being used, the penetration depth of the dolly shall not exceed 2m below the existing ground level. (Enclosed is the steel impedance of the dolly proposed for use.)
    • Near the end of the working day, a suitable number of lower piles will be driven. Continuation of driving and joining these piles will be carried out the following working day.
  • Pile Eccentricity Survey
    • Surveyors record the as-built pile positions, i.e., pile eccentricities, and if such values exceed beyond the tolerable limit, designed checks for rectification works shall be followed up accordingly.

SAFE WORK PROCEDURE

  • Preliminaries
    • Permit to work from Uruk (Piling work and Hot work).
    • “DANGER” warning signboards shall be put around the working area.
    • “SAFETY FIRST” signboards shall be put up in suitable and prominent locations.
    • Approved barricades and/or hoarding shall be put up to keep the unauthorized worker out from the working area.
    • Uniforms and safety apparel such as helmets, safety boots, and instructions on safety precautions shall be issued/provided to all workmen prior to commencement of work.
    • Materials required for piling works shall be properly stored at areas designated for this proposal.
    • Double ear protection to be worn & signage placed at barricades.
    • Safe and stable working platforms and access will be provided for machinery and workmen for every piling area.
  • Inspection
    • All service cranes and pile driving rigs shall possess a valid inspection certificate.
    • The piling rig and the service crane will be inspected by Uruk off-site prior to mobilization to the site. Upon arrival on-site and fully assembled, the service crane and the piling rig will be inspected by Uruk.
    • All service cranes and pile driving rigs shall be maintained in good condition and to be inspected regularly by a competent person, customarily the authorized operator.
    • Every piling frame, service crane, and attachment shall be thoroughly inspected and examined by an approved person at least once a year.
    • Regular maintenance and inspection of service cranes shall be conducted by the Sub-contractor's in-house mechanic every three months.
  • Authorized Operators and Crew
    • The operation of the service crane shall be handled by a licensed and experienced & competent operator.
    • Each member of the piling crew shall be properly instructed in the work he is entrusted with. The entire operation shall be in the charge of a designated person who shall personally direct the work and give the operation signals.
    • The operator of every piling rig and crane shall be protected from falling objects, steam, etc. by substantial covering.
    • The safe lifting load and distance of lifting shall not be exceeded. A load chart shall be displayed on all service cranes.
  • Handling of Piles
    • The preparation of the piles shall be done at safe distance from the driving operation. During the hoisting of piles, all persons not actually involved in operating the equipment and handling the piles shall be kept out of the area.
    • Ensure slings are protected from sharp edges on piles.
    • Ground around the pile to be tested shall first be inspected and compacted and/or hard cores to be added. Steel plates or timber mats shall then be placed over the leveled ground.
  • Record Keeping (QA/QC)
    • Record keeping shall be handled by the QC team.
    • All Piling works/activities shall be recorded in the report’s forms/ checklists given by the Uruk.
  • Health and Safety
    • Significant risk: During driven activities, one of the most significant risks to personnel is falling pieces of concrete detached from the pile, falling will be so quickly and without pre-warning, therefore appropriate controls must be in place before work begins in the area. The description of measures to control the safety threats are listed in Job Safety Environmental Analysis “JSEA for Installation of Piles”
  • Environment
    • IROS Co. will provide the plans to keep the environment control plans, no fuel or lubricants will be thrown or leaked on the earth by the operators of the heavy equipment, no burning of non-natural materials to be done in the open area for warming up the place, no garbage thrown in the area, all waste should be collected in containers and will be transported and thrown with the town waste collection and disposal operations.

Flow Chart for Driving Pile works

Permit to Work

Piling work and hot work

Confirmation TBM/Pre-Computation Survey Plan/ Setting out of corner pegs

Setting Out Pile Points

Piling Operations
Load Test

Pile Joints
Hot Works Operation

Piling Operations
Setting

Drawings and Method of Piles Connections

Precast Pile

  • Our client: Ministry of Municipalities
  • Wasit Governorate
  • CGC INT Iraq & IROS Oil Services Ltd.
  • Location: Iraq / Wasit
  • Date of work: 2019 – 2020

The project is a heavy water treatment plant.

Piling works (manufacturing, transport and Pile penetrations)
Test pile (Static Load Test, Dynamic test and Integrity)
Extraction and Sheet Pile penetrations works.

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