Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore !!better!! Direct

Good practice for jacked pile installation is anchored in a hierarchy of standards, codes, and regulations. Compliance with these is not optional; it is the baseline for legal and professional accountability.

Pile heave occurs when the jacking of piles displaces soil, causing adjacent piles to rise. If undetected, heave can result in piles losing their shaft friction and bearing capacity. Mitigation measures include:

Sonic integrity testing checks for cracks or discontinuities in concrete piles caused by high jacking stresses. Conclusion

| | Requirement / Purpose | | :--- | :--- | | BS EN 12699:2015 | Execution of special geotechnical works – Displacement piles. Applies to jacked piles installed without excavation. | | Eurocode 7 | Geotechnical design principles for pile capacity and structural integrity. | | BCA Circular APPBCA-2022-15 | Requirements and guidelines for driven or jacked piles, including heave monitoring and risk-based approaches. | | CP4 | Pile designs must satisfy safety factor against failure, settlement limits, and adequate structural capacity for installation forces. | | BCA/IES/ACES/GEOSS Circular 2016 | Mandates ground investigation, load tests, and quality control for building foundations, with specific testing frequencies and safety factors. | Good practice for jacked pile installation is anchored

These are essential to verify design parameters. If actual verified parameters are better than the optimistic design set, an amendment submission may be required.

Common types of jacked piles in Singapore include:

Unlike impact hammers, jacked piles allow . GEOSS defines three control modes: If undetected, heave can result in piles losing

✅ Always verify against CPT/SPT data – jacking into Old Alluvium > SPT 100 may stall the rig.

18-storey residential tower, Punggol Northshore District. Geology: Fill (2 m) over Kallang Formation marine clay (12 m) over Old Alluvium (dense, N=60+). Challenge: Piles required termination in Old Alluvium, but adjacent pile driving caused heave in earlier phases.

Maintain a including:

Designs must comply with Eurocode 7 (EC7) and the National Annex, which superseded SS CP4 in April 2015.

To mitigate these environmental impacts, the published industry guidelines for alternative piling technologies. Jacked foundation piles use hydraulic machinery to press high-capacity piles into the soil. This method offers a vibration-free, low-noise, and air-pollution-free alternative.