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Jadwal Siaran
The Geotechnical Society of Singapore (GeoSS) provides guidelines for jacked foundation pile installation, emphasizing stringent controls on verticality, equipment calibration, and sequence to manage ground movement. Installation requires a re-jack process to reach specific settlement "set" criteria, typically 10mm or less, to ensure structural integrity. For the full guide, visit GeoSS.
The "Set" Definition: A pile is considered "set" if the downward movement does not exceed 10 mm with a minimum holding time of 30 seconds. GeoSS recommends achieving two consistent sets. The "Set" Definition: A pile is considered "set"
Piling rigs must undergo a regular maintenance regime. Specialist builders are required to maintain daily, monthly, and yearly Maintenance Checklists to ensure equipment safety. Platform Stability: Specialist builders are required to maintain daily, monthly,
or in a consistent direction (e.g., left to right) to manage soil displacement. Jacking Force ( cap P sub j : Typically, piles are jacked to a force equal to 2.0 to 2.5 times the Working Load (WL) Course Hero 3. Termination ("Set") Criteria 5%) indicates good set-up |
| Stage | Action | Acceptance Criteria | |-------|--------|----------------------| | 1 | Survey and set out pile positions | Within ±25 mm of design coordinates | | 2 | Pre-boring (if required in OA or hard clay) | Diameter ≤ 0.7 × pile diameter; depth to clear stiff layer | | 3 | Position jacking frame | Verticality check with dual-axis inclinometer | | 4 | Commence jacking at ≤ 5 mm/s | Jacking force vs. depth plot recorded continuously | | 5 | Monitor heave of adjacent ground | Maximum heave ≤ 15 mm at 1 m from pile | | 6 | Terminate jacking | Either: (a) design toe level reached, OR (b) refusal at 1.5 × design load for 3 consecutive 100 mm strokes | | 7 | Hold for 2 minutes, then release | No significant force loss (>5%) indicates good set-up |