Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore __hot__

Introduction

Never adjust a pile’s alignment by force once installation has begun.

: Encountering boulders or hard intermediate layers can lead to short piles. If a pile is more than 20% shorter than planned, an amendment plan submission to the authorities is typically required. Quality Assurance and Testing

The stability of the jacking machine must be verified, especially on soft ground. Specialist builders must maintain high-capacity rigs; for example, G3 category specialists require rigs with a minimum 400-ton counterweight . Introduction Never adjust a pile’s alignment by force

Continuous checks on pile verticality are essential throughout the installation.

The high compressive forces exerted during hydraulic jacking require premium materials and calibrated machinery.

: If a pile penetrates a consolidating soft soil layer, the force direction may reverse over time. This long-term "negative skin friction" must be accounted for in the magnitude of the jacking load during installation. Quality Control & Testing Quality Assurance and Testing The stability of the

The following practices are recommended by the GeoSS Guideline on Jacked Piles to ensure quality and safety during construction: :

┌──────────────────────────┐ │ Rig Setup & Leveling │ └─────────────┬────────────┘ │ ▼ ┌──────────────────────────┐ │ First Element Pitching │ └─────────────┬────────────┘ │ ▼ ┌──────────────────────────┐ │ Continuous Penetration │ └─────────────┬────────────┘ │ ▼ ┌──────────────────────────┐ │ Segment Joint Welding │ └─────────────┬────────────┘ │ ▼ ┌──────────────────────────┐ │ Final Termination Criteria│ └─────────────┬────────────┘ │ ▼ ┌──────────────────────────┐ │ Quality Assurance Testing│ └──────────────────────────┘ Step 1: Rig Setup and Alignment

: A comprehensive technical draft covering ground movement control and protective measures. The high compressive forces exerted during hydraulic jacking

: A joint circular from BCA, IES, ACES, and GeoSS (2022) regarding ultimate load testing and design verification.

: Conduct a trial on the first pile installation to observe ground performance before proceeding with full-scale work.