Good Practice for Installation of Jacked Foundation Piles in Singapore
These are essential to verify design parameters. If actual verified parameters are better than the optimistic design set, an amendment submission may be required.
It is recommended to achieve by releasing and reapplying the load without pause. Environmental & Site Management :
A successful jacked piling campaign begins long before the rig arrives on site. Detailed planning prevents unexpected refusal or excessive soil displacement.
Specific regulations for jacking.
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).
A pile is generally considered "set" if the downward movement does not exceed 10 mm (some guidelines specify 5 mm ) during a holding time of at least 30 seconds .
Sonic echo integrity testing is performed on 100% of concrete jacked piles. A small hand-held hammer strikes the pile head, sending a low-strain sound wave down the shaft. Reflections captured by an accelerometer identify structural cracks, cold joints, or necking caused by excessive installation stresses. Conclusion
GEOSS Technical Committee – Pile Installation Working Group Disclaimer: This paper is a good practice guide, not a legal document. Site-specific design by a Professional Engineer (Civil/Geotechnical) registered in Singapore is required. Good Practice for Installation of Jacked Foundation Piles
When a segment is fully pressed, the next segment is aligned and joined. For precast concrete piles, this involves full-penetration structural welding of matching steel end-plates. The weld must cool naturally before jacking resumes; water quenching is prohibited as it embrittles the steel. Step 5: Final Termination and Set Criteria
A comparison of for pile segments. Details on the Kallang Formation soil challenges.
A pile is considered "set" if its downward movement does not exceed over a minimum holding time of 30 seconds Double Verification: GeoSS recommends obtaining two consistent sets
Current standards emphasize performance-based design where designers review instrumented Ultimate Load Test (ULT) results to verify design parameters. Environmental & Site Management : A successful jacked
Unlike bored piling which generates wet soil slurry, jacked piling displaces soil laterally, keeping the job site dry and reducing waste disposal costs.
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The Geotechnical Society of Singapore ( GeoSS ) has established specific guidelines for the installation of jacked foundation piles to ensure structural safety and serviceability within Singapore’s unique geological landscape. Jacked piles are favored in urban areas due to their , negligible vibration , and minimal soil disposal . 1. Pre-Installation and Ground Considerations