: If piles encounter boulders or hard intermediate layers, they may end up shorter than designed. Any reduction in length greater than
Minimizes the risk of structural settlement or cosmetic damage to adjacent property.
: Jacking continues until practical refusal is achieved, at which point the pressure is released and reapplied without pause to verify the set. 2. Ground Condition Monitoring : If piles encounter boulders or hard intermediate
However, the lack of a unified standard historically led to inconsistencies. The GEOSS Guide addresses this by codifying the "good practice" specifically tailored to Singapore’s unique soil conditions—ranging from soft marine clay to the erratic Bukit Timah Granite and the Jurong Formation.
drops to zero and is immediately re-applied to confirm depth without pausing. Key Benefits of Jacked Piling drops to zero and is immediately re-applied to
The GeoSS Guidelines emphasize several critical factors for successful installation:
Jacked foundation piles have become a cornerstone of modern construction in Singapore, particularly in dense urban environments requiring low noise and vibration. The Geotechnical Society of Singapore (GeoSS) has established guidelines, specifically through drafted documentation on jacked pile installation, to ensure the structural integrity, safety, and performance of these foundations. 3. Machine Stability and Safety
Operators should use two independent surveying instruments (theodolites or total stations) positioned at 90-degree angles to monitor verticality continuously during the initial drive.
The pile must be checked for verticality at the start of jacking, and it must be maintained throughout the installation process.
: In areas like the Jurong Formation or Bukit Timah Granite , varying rock profiles can lead to "short piles" if boulders or hard layers are encountered unexpectedly. 3. Machine Stability and Safety