Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore Updated May 2026

Mastering the Press: Good Practices for Jacked Piling in Singapore

• Adopted hydraulic jacked spun piles (400 mm dia, 24 m long).
• Installation sequence: spiral outward from centre, with 6-hour delay between piles in a group.
• Real-time monitoring of jacking force vs. penetration at 20 Hz.
• Set criteria: final 10 mm stroke requiring 2,800 kN (1.8 x working load).

Short Piles: These can occur when hitting boulders or intermediate hard soil layers. If a pile is more than 20% shorter than the design depth, an amendment plan is required, or its capacity must be verified through additional load tests.

To manage challenges unique to displacement piles in Singapore's diverse soil, the following measures are recommended: Soil Displacement Controls : In sensitive areas, use relief wells pre-boring

Using temporary open trenches or earth-retaining walls to contain ground movement within the project boundary. isomer-user-content.by.gov.sg Operational Good Practices Platform Preparation:

Failure 2: Eccentric Overturning of Pile Head

• Scenario: Jacking against a sloping bedrock surface in Bukit Timah granite.
• Violation: No toe shoe or sacrificial tip.
• Result: Pile head split vertically.
• GEOSS Solution: Pre-install a steel driving shoe. Use a pile cushion (20mm marine plywood) between the jack and pile head. If deflection exceeds 1:200, extract and abandon.