!link! - Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore

Contractors must hold the relevant Specialist Builder license under the Singapore Accreditation Council (SAC) criteria. For instance, Category G2 and G3 piling specialists must maintain a fleet of modern hydraulic jacking rigs equipped with verified counterweights ranging from 200 tons to 400 tons .

Specialist builders must perform Sonic Logging or PDA/PIT tests to detect hidden underground defects.

Continuous checks on pile verticality are essential during the initial jacking stages. Record Keeping: Continuous checks on pile verticality are essential during

Unlike driven piling which relies on hammer blow counts, jacked piling uses continuous hydraulic force. The GeoSS standard termination criteria ensure the pile reaches its targeted geotechnical ultimate capacity safely: Jacking Force ( Pjcap P sub j

Jacked piles offer an efficient, low-disturbance foundation solution for Singapore’s urban environment when installed using GEOSS good practice. Critical success factors include: , strict verticality control , limiting jacking rate in clay , and pre-boring for Old Alluvium or bouldery ground . Adherence to this practice minimizes risks to adjacent structures, ensures pile integrity, and meets regulatory requirements from BCA, LTA, and NEA. 2. Penetration and Splicing

: A comprehensive technical draft covering ground movement control and protective measures.

Singapore's diverse geological formations—ranging from soft marine clay deposits in the Kallang Formation to highly weathered soils in the Jurong Formation—introduce unique pile behaviors during installation: Geological / Installation Risk Geotechnical Impact GeoSS / BCA Mitigation Strategy Induces significant pile heave and lateral displacement. Mandatory monitoring of adjacent ground/pile movements. High Slenderness Ratios Critical success factors include:

The jacking rig must be leveled accurately using built-in hydraulic jacks. The first pile segment is pitched into the grip mechanism. Engineers must check the verticality of the pile in two orthogonal directions using plumb bobs or digital spirit levels. The structural verticality tolerance must be strictly maintained within 1 in 100. 2. Penetration and Splicing