Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore Extra Quality Online

The Geotechnical Society of Singapore (GeoSS) provides guidelines for the installation of jacked piles, emphasizing that it is a "friendly method" due to being vibration-free, air pollution-free, and low-noise. This method is particularly suitable for congested urban environments in Singapore, like high-density condominium developments. Core Installation Guidelines

| Site Condition | Recommended Sequence | |----------------|----------------------| | Single isolated pile | No special sequence. | | Group of piles (≤9) | Center-outwards or spiral. | | Long pile rows (e.g., for retaining walls) | Staggered, with pre-drilled pilot holes (50–70% pile diameter) to reduce displacement. | | Adjacent to MRT / existing building | Install “sacrificial” or “guard” piles first, then inner piles. Use extremely low jacking rates (<5 mm/s). | Heave check: After each new segment is welded

Heave check: After each new segment is welded (for steel) or jointed (for precast), re-check the level of adjacent piles (within 5 diameters). If heave >5mm, pause and relieve pore pressure.

Good Practice for Installation of Jacked Foundation Piles (BCA): A key guideline published on October 8, 2015, which aligns with industry best practices. Good Practice for Installation of Jacked Foundation Piles

Final Set: The pile is typically terminated when it reaches a specific penetration resistance (pressure) or "Set" (movement per unit of force).
The Formula: The guide references standard pile driving formulas adapted for static jacking. The QP must calculate the required jacking force to achieve the design working load with an adequate factor

References

GEOSS Note: A pre-construction trial jacking (at least 2 piles) must be witnessed by the QP to validate driving energy, set-up behaviour, and reaction system capacity. which aligns with industry best practices.

The following technical paper outlines the core principles and "good practice" standards derived from GeoSS recommendations and local industry standards.