Singapore N109A Pipe-Jacking Project
7.63m x 6.43m STEC EPB Pipe-Jacker
Project Year: 2024
Project Overview
Third-party Settlement Measurement Data showing ground disturbance within millimeter
Project Summary:
Location: N109A project in Singapore downtown core.
Surroundings: Near City Council, schools, and residential buildings.
Underground Utilities: High-voltage cables, gas, telecom, water, and sewage pipes.
Construction Challenges:
Tunnel Features: Large excavation area with shallow depth.
Geological Conditions: Complex, including weathered rock, sedimentary soil, and quicksand layers.
Underground Utilities: Dense networks of cables, communication lines, gas and water pipes below.
Construction Challenge: Tunnel to be excavated beneath a six-lane road with only 1.02 meters of clearance.
Environmental Considerations: Project near Hougang residential area, requiring careful environmental protection during construction.
Jello-Mud Results:
Injection: Injected Jello-Mud into the reserved holes of the Pipe-Jacker body and pipe segments via an injection pump, according to the required volume.
Settlement Prevention: Kept the tunnel axis within ±20mm to meet construction requirements.
Leakage Prevention: No water leakage at the launch and reception shafts or pipe segments, meeting the no leakage and minimal disturbance standards.