Special Project - Modification / Install of U/G A/C Cooling Water Intake Pipes by PipeJacking for China Insurance Building CIGB
2012-2013
Project Overview
Client
Harriman Property Management Limited
Location
Connaught Road Central, Hong Kong
Pipe Jacking Tunnel
DN1350 steel segment sleeve pipe – 40 m long
Carrier Pipes
Twin DN350 mild steel seawater cooling water pipes
Completion
August 2013
This landmark trenchless project delivered a new air‑conditioning seawater intake system for the iconic China Insurance Group Building, located on one of Hong Kong’s busiest thoroughfares. A DN1350 hand‑shield pipe jacking tunnel was driven 40 m beneath Connaught Road Central, completely avoiding open‑cut excavation. Inside this tunnel, twin DN350 cooling water pipes were installed, tested, and connected to the building’s existing plant room and seaward intake points.
Pipe Jacking Head
Flange jointed mild steel seat water cooling water pipe
Scope & Key Techniques
Hand‑Shield Pipe Jacking – DN1350 steel segment sleeves were jacked through mixed ground using a conventional hand‑shield method, with guidance from a precisely aligned steel guide rail.
Twin Cooling Pipe Installation – Two DN350 flange‑jointed mild steel pipes were laid inside the completed tunnel, connected to new valve pits and the existing cooling system, with full hydraulic pressure testing to 1.5 times working pressure.
Grouting of Abandoned Pipes – Old intake pipelines were safely decommissioned and backfilled by grouting.
Utility & Condition Surveys – Comprehensive pre‑construction utility surveys (HKIUS‑compliant) and building condition surveys were carried out to safeguard adjacent structures and dense underground services.
Traffic & Safety Management – Approved Temporary Traffic Arrangements (TTA) maintained pedestrian and vehicular flow throughout works; hoardings and safety plans protected the public and site personnel.
