Project parties must submit in a timely manner the following documents in the issued by the Commissioner of Building Control together with the Notice of Approval for the first piling plan:
The GeoSS good practices presented in this article—encompassing everything from borehole planning to final load test submission—provide a framework for achieving not only regulatory compliance but also project success. In an industry where “lack of quality assurance and quality control by contractors and lack of proper site supervision by suitably qualified engineers” remains a major cause of project problems, adherence to these practices is not optional—it is essential.
Maintained load tests are conducted on selected working piles to verify that settlement at design load and test load matches acceptable structural limits. Integrity Testing (PIT) Project parties must submit in a timely manner
Standard Penetration Test (SPT) N-values must be mapped to determine the required termination depth.
Jacked piling uses pre-formed elements (like prestressed concrete spun piles, precast RC piles, or H-steel piles) pressed into the ground via a hydraulic system weighted by counterweight dead loads. This article breaks down the technical requirements, termination criteria, and structural challenges of installing jacked foundation piles according to the GeoSS Guideline and Singapore Building and Construction Authority (BCA) frameworks. Core Mechanics and Machine Capacities an amendment submission may be required.
Proper pile termination is critical to ensure the foundation meets its design load without excessive settlement. Termination Force ( cap P sub j Piles are typically jacked with a force ( cap P sub j ) adjusted in steps to 2.0 to 2.5 times the working load (WL) The 'Set' Criterion:
These are essential to verify design parameters. If actual verified parameters are better than the optimistic design set, an amendment submission may be required. precast RC piles
: Jacking continues under the target Pjcap P sub j force until downward penetration halts. The Unloading/Reloading Cycle : The Pjcap P sub j
Increases risk of pile buckling or deviation under peak load.
: Piles should never have their vertical alignment adjusted by force once installation has begun.
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