Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore Link Link

In Singapore, the pile is normally jacked into the ground with a jacking force, Pjcap P sub j , adjusted in steps, typically recommended to a value of times the Working Load ( WLcap W cap L

Based on GEOSS technical references, BCA’s “Code of Practice for Foundations” (CP 4), and local project case histories shared on GEOSS, the following good practices apply:

Continuous monitoring of pile verticality to prevent deflection. In Singapore, the pile is normally jacked into

-values must be logged accurately to estimate the required jacking force and predict potential refusal depths.

: Piling specialists must maintain substantial counterweight setups. Under the Singapore Accreditation Council (SAC) criteria for specialist builders, minimum counterweights of 200-ton and 400-ton are required depending on the builder's category. Under the Singapore Accreditation Council (SAC) criteria for

) of a jacked pile relates closely to its final termination jacking force ( Pjcap P sub j Research shows Pucap P sub u generally ranges from . Pucap P sub u falls below Pjcap P sub j

Jacked-in pile systems have become a preferred foundation solution in Singapore's dense urban environment, primarily due to their ability to provide high load capacity while operating quietly and without vibration. As geotechnical construction becomes more sophisticated, adhering to standardized "good practice" guidelines is critical for safety, efficiency, and compliance. 50 or clay N &gt

For members, a free PDF download is available. Non-members may purchase the guide at S$120 (hardcopy) or S$90 (digital). The document includes 12 appendices, including sample checklists, heave calculation nomographs, and calibration log templates.

To prevent premature termination and ensure settlement criteria match design assumptions under [Singapore Standard Eurocode 7 (EC7)](1.2.2, 1.2.3), the following workflow must be maintained:

Identifying groundwater tables and permeability helps engineers predict the magnitude of the setup effect and manage pore pressure dissipation. 4. Guidelines for Installation and Machinery

| Parameter | GEOSS (Singapore) | BS 8004 (UK) | Eurocode 7 | |-----------|-------------------|--------------|-------------| | Max jacking force | 80% of pile structural capacity | 75% (driven piles) | 85% (static load) | | Heave limit | 15 mm at 1 m distance | 25 mm at 2 m | Not explicitly defined | | Verticality tolerance | 1:200 | 1:75 | 1:100 | | Restrike period (clay) | 3 to 7 days after initial jacking | 1 to 5 days | 2 to 10 days | | Pre-boring permission | Required if SPT > 50 or clay N > 20 | Optional | By specification |