| Parameter | Frequency | Acceptance | |-----------|-----------|------------| | Jacking force | Continuous recording | ≥ design capacity at toe level | | Pile penetration rate | Every 0.5 m | Sudden drop indicates fracture or void | | Verticality | Every 3 m | ≤0.5% for LTA; ≤1% for BCA | | Toe level survey | Every pile | ±25 mm |
: To be deemed a successful "set," the downward movement under maximum load must not exceed 5 mm during a minimum 30-second holding time .
One of the most critical aspects covered in the guide is knowing when to stop. Designers must be vigilant and may require probe
Folded rock profiles can lead to drastically different pile lengths within a single pile cap. Designers must be vigilant and may require probe holes at every pile location in erratic areas like limestone.
Adhering to a standardized installation sequence ensures consistency and structural compliance. 1. Rig Setup and Pitching Rig Setup and Pitching Artificially inflates or reduces
Artificially inflates or reduces short-term resistance readings.
The method offers advantages over driven or bored piles in Singapore’s soft to medium-dense marine clay, Kallang Formation, and Old Alluvium. tilting of adjacent structures
However, successful implementation requires rigorous adherence to quality standards. This is where the provides essential direction through its Good Practice Guide .
Before commencing the installation of jacked foundation piles, the following pre-installation checks should be carried out:
Due to past incidents of ground movement, tilting of adjacent structures, and improper termination criteria, the Geotechnical Engineering Society of Singapore (GEOSS) published . This guide serves as the industry benchmark for "Good Practice" and is referenced by the Building and Construction Authority (BCA).