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Tsing Tsuen and Ha Kwai Chung tunnels DB-320 Contractors will be using a mixed ground tunnel boring machine, a first for Hong Kong.

Three distinct types of ground lie along the route of West Rail's southernmost tunnelled section, but the contractor will only be using two techniques. By using a mixed ground tunnel boring machine, Dragages and Zen Pacific are able to avoid opening up a cut and cover section. The machine will be a first for Hong Kong, and KCRC only agreed to its use after talking to clients from earlier projects.

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