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

Table of Contents General Setting out Drilling Piles Termination Clearing of Pile Base Installation of Reinforcement Placing of Concrete Testing of Concrete Possible Problems Encountered Noise And Vibration Hazard Analysis Method of Locating And Avoidance of Utility Services Bored Pile Record Sheets General The general sequence for bored pile works is shown as below: - Figure 1: Flow Chart For Bored Pile Process Setting Out In house surveyor will set out the pile location with reference to the control point established by the licensed surveyor. Prior to boring, the pile point shall be checked and offset along the 2 main axis for checking any deviation during initial boring. Drilling Before boring, the supervisor/ project manager shall verify all associated technical information such as presence of services, pile co-ordinates, platform level, cut-off level, validity of drawings and etc. The pile boring operations will be performed by the flight auger or boring bucket attached to a hydraulic drilling unit which is mounted on a crawler crane. The verticality of bored hole will be checked from time to time from the top while advancing the bored hole. Sighting plumb line shall be used to check the verticality of the Kelly bar of boring machine against 2 major axis. The checking shall be carried out before and during boring process at regular interval to ensure boring hole is constructed and completed within tolerance. Steel casing of adequate thickness shall be used to prevent unstable soil from caving into the bored hole for the first 6~12m of the soil strata. The casing will be installed by vibrating hammer or driven by the boring rig. Water shall be utilised as a medium stabalising fluid in the process of forming the borehole. During the boring process, the water level shall be kept as high as possible within the casing and well above the existing ground water level. Rock drilling tools or chisels shall be used to drill into rock. The clerk of work or engineer sha