Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore Link
[ Hydraulic Pressure Applied ] │ ▼ [ Step-wise Increase to 2.0–2.5 × WL ] │ ▼ [ Reach Practical Refusal ] │ ▼ [ Release Pressure to Zero ] │ ▼ [ Immediate Re-application without Pause ] │ ┌───────────────┴───────────────┐ ▼ ▼ [ Measure 1st Set ] [ Measure 2nd Set ] │ │ └───────────────┬───────────────┘ ▼ [ Check: Is Downward Movement ≤ 10mm? ] [ Hold Time ≥ 30 Seconds ] │ ┌────────────────┴────────────────┐ ▼ ▼ ( YES ) ( NO ) │ │ [ Pile Confirmed ] [ Repeat Cycle Until ] [ Successful ] [ Criteria Achieved ]
) adjusted systematically in stages up to .
To confirm stability, the jacking force is released to zero and then re-applied immediately. Engineers generally recommend achieving two consistent "sets" before concluding installation. Geotechnical and Structural Considerations [ Hydraulic Pressure Applied ] │ ▼ [
requires a formal amendment plan and verification through working load tests. Singapore Accreditation Council Regulatory and Testing Context Performance-Based Design : Recent guidelines from the Joint BCA/IES/ACES/GeoSS Circular
In standard Singapore practice, the hydraulic jack drives the pile section into the ground while modifying force in incremental steps until reaching a designated target value, usually varying between . : Since 2015, all structural pile designs in
: Since 2015, all structural pile designs in Singapore must comply with Eurocode 7 (Geotechnical Design) , though legacy standards like SS CP4 still provide non-contradictory complementary information.
As specified by GeoSS, the sequence to determine a valid termination follows strict, non-negotiable operational steps: : Since 2015
Because jacked piles are high-displacement options, they push aside massive volumes of soil. In thick zones of soft clay, this creates high lateral pressures that can cause , damaging neighboring utility lines or shifting adjacent completed piles out of place.
Record digitally every 0.5 m of penetration:
