MTR West Island Line 703

Construction of two rail tunnels (extension of the MTR West Island metro line to the new Sai Ying Pun station)

Underground Works

Hong-Kong, 2009-2014

General description

Prior to constructing the two new rail tunnels, 1,208 metres in length with a diameter of 6.4 metres, it was first necessary to dismantle 150 metres of existing tunnel. The machine used was a first of its kind: the Tunnel Dismantling Machine (TDM), an innovative TBM that reversed the construction process. The TDM maintained a confinement pressure of three bars to enable dismantling of the existing segments and back-filling of the tunnel, in soft soil located below the water table in Hong Kong’s city centre. The main advantage of this unique procedure was that it limited challenging dives in hyperbaric conditions by mechanising the process.

Consortium

DRAGAGES HONG-KONG / MAEDA / BACHY SOLETANCHE GROUP

Project owner

MASS TRANSIT RAILWAY CORPORATION

Key figures

1,208 m

total length of tunnels

World 1st

use of the TDM

1

innovation shared with the customer : instrumented cutter disc

Locations

Associated Projects

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