Introduction
Unlike driven piles, jacked piles require a controlled, steady penetration rate.
Jacking continues until practical refusal is reached. The load is then released and reapplied to measure the "set".
Jacked foundation piles offer a quiet, vibration-free, and environmentally considerate deep foundation solution ideally suited to Singapore’s dense urban environment. However, their successful installation demands more than appropriate equipment—it requires rigorous site investigation, competent design, vigilant site supervision, comprehensive testing, and meticulous documentation. Introduction Unlike driven piles, jacked piles require a
To guarantee execution safety, the Singapore Accreditation Council (SAC) sets forth strict criteria under standard for Specialist Builders in piling works. Operational personnel, including Piling Engineers and Supervisors, must maintain active listing in the IES/GeoSS Piling Personnel Registry as Certified Piling Personnel (CPP).
Jacked piling uses hydraulic rams to press precast concrete or steel piles directly into the ground. This technique provides unique mechanical advantages and requires strict adherence to specialized operational parameters.
:
A comprehensive record of all installations, including daily reports, jacking logs, heave monitoring data, and test results, must be maintained. Supervisors must submit interim certificates at defined milestones (e.g., 50% and 100% of pile installation) to the Commissioner of Building Control.
The guideline mandates releasing Pjcap P sub j
who determines the final penetration depth based on actual site conditions. Integrity Testing Jacked foundation piles offer a quiet, vibration-free, and
These are essential to verify design parameters. If actual verified parameters are better than the optimistic design set, an amendment submission may be required.
: Jacking displaces soil laterally and vertically. In dense clay or silt, this can cause heave. Pre-boring or relief drilling may be required to alleviate excess pore water pressure and ground movement.
For precast concrete or spun piles, mechanical joints or full-penetration butt welding of steel end plates are used. In dense clay or silt