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Bored Piling Method Statement 灌注桩施工方案.doc

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Bored Piling Method Statement 灌注桩施工方案.doc
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Method Statement for Bored Pile1Table of Contents1.0 General2.0 Setting out3.0 Drilling4.0 Piles Termination5.0 Clearing of Pile Base 6.0 Installation of Reinforcement7.0 Placing of Concrete8.0 Testing of Concrete9.0 Possible Problems Encountered10.0 Noise And Vibration11.0 Hazard Analysis12.0 Method of Locating And Avoidance of Utility Services13.0 Bored Pile Record SheetsMethod Statement for Bored Pile21.0 GeneralThe general sequence for bored pile works is shown as below: -Set Out Pile PositonDril To About 4.5mProced DrilingFinal DepthCleanig Pile BaseInstal Stel CageInstal Tremie PipeConcret Pile ToRquird LvlExtract Temporay CasingBack-fil Empty BoreIf RequiredBore HoleStabiltyEncounter RockRecord Al Soil SampleAt Regular IntervlDril Using Rock TolsInstal CasingNoYesYesNoOrder ConcretFix Spacers2 cubes at age of 7 days2 cubes at age of 28 days2 cubes as standby cubes or at age of 56 days (if required)9.0 Possible Problems EncounteredDue to variable nature of soil, there may be some possible problems encountered. Some of the common problems are: -a) Present of obstructionFor shallow obstruction that is within the reach of a hydraulic excavator, it shall be dug out with the hydraulic excavator. Otherwise, assuming that the obstruction is a boulder, chiseling is normally adopted.b) Sudden loss of support fluidAs a precaution against the unlikely event of collapse water level is always maintained at 0.5m below casing. In the unlikely event of the sudden loss of Method Statement for Bored Pile6support fluid, the boring will be immediately stopped and back-filled with clayey material or lean mix concrete until the loss of support fluid is stopped.After remedial measures have been undertaken, boring will resume.c) Verticality of excavationThe verticality is maintained by checking the Kelly bar against a plumb bob at two major directions. Should verticality be out of tolerance, the bored hole is back-filled and the verticality will be rechecked for re-boring.d) Defective pilesIf the completed piles is found (by sonic coring or other) not to be good quality over the design socket length, the remedial measures shall be: - The engineer shall assess whether the pile can be use after down grading. To install additional piles.This problem can be prevented or minimized if the following measure is carried out:- Always plan the supply of concrete is timely so that the bored hole is not left long after excavation. During concreting, concrete curve chart must be maintained to check any collapse of soil. Adjacent piles close to the newly completed bored piles are not installed until at least 24 hours later.10.0 Noise and VibrationUnlike driven pile system, bored pile system generally will not have any problem with noise and vibration. However, noise monitor will be carried out during operation to check the noise-generated compliance to the local authority requirement.11.0 Hazard AnalysisHAZARD PRECAUTIONSa) Injury from falling defect Crane operator not allowed to lift items directly over workers.All workers must wear safety helmet. Only bench men is allowed to stay near boring rig during boring operationb) Injury from falling into borehole all open holes shall be covered if left unattended.Method Statement for Bored Pile7c) Injury from concreting Proper signal to crane operator and avoid standing at the direction of the concrete truck.d) Entanglement with moving plant Stay out of danger zone of boring rig, crane and excavator.e) Snapping of the wire rope Crane and Rig operator shall carry out daily safety and service checks.12.0 Method of Locating and Avoidance of Utility ServicesBefore any piling operation being carried out, the following operations shall be carried out to locate any utility service: -a) Based on licensed surveyor’s underground services survey mapping, we shall identify and peg the location of services. Those services need to be relocated or diverted shall be carried out prior piling commencement. Services that do not require relocation shall be clearly marked.b) Visual inspection of the piling site shall be carried out to check any services markers that did not pick up by the surveyor’s mapping. Manual excavation or pilot trenching shall be carried out to determine the depth of services.c) Cable detector will also be used to detect any underground cable.13.0 Bored Pile Record SheetFor every pile, it must be completed with the following record sheets: -a) Inspection Request Formb) Bored Pile Recordc) Concrete Progress ChartRefer QA/QC procedures attachments for sample of record sheets.
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