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: Typically, piles are jacked with a force adjusted in steps to a value of 2 to 2.5 times the Working Load (WL) until practical refusal is reached. The Set Procedure : Pjcap P sub j is released to zero and immediately re-applied.
Contractors must perform a pre-construction condition survey of all buildings within the zone of influence. Safe vibration and displacement limits must be established in accordance with Building and Construction Authority (BCA) regulations. Equipment Calibration : : Typically, piles are jacked with a
For high‑rise buildings underlain by thick layers of soft clay deposits, pile heave and settlement risks are elevated. Mitigation measures include:
Heave monitoring of driven or jacked piles during installation is mandatory. This ensures that soil displacement does not cause adjacent piles to rise, which could lead to loss of capacity. Safe vibration and displacement limits must be established
: Jacking rigs are exceptionally heavy, often weighing between 150 to 600 tonnes. The working platform must be designed and certified by a Professional Engineer (PE) to prevent rig tilting or ground bearing failure. Selection and Inspection of Materials and Equipment
: Piling works must be overseen by qualified personnel with relevant experience, and machinery (such as jack rigs) must undergo regular maintenance with documented checklists. This ensures that soil displacement does not cause
Vertical alignment must be checked in two perpendicular directions using dual total stations or plumbing devices.
The installation of jacked foundation piles in Singapore requires careful planning, precise execution, and rigorous quality control to ensure a successful project. By following the good practices outlined in this article, contractors and engineers can minimize the risks associated with jacked foundation piles and ensure that the foundation of the structure is safe, durable, and fit for purpose.