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  General Safety Management In Tunnel Construction For The Deep Tunnel Sewerage System (DTSS-Phase 1) - Public Utilities Board (PUB) - Republic of SINGAPORE

  The DTSS Project (Phase 1) consisted of 48 km of main tunnel, 38 shafts and connecting underground structures. The main tunnel diameters vary between 3.3 metres and 6 metres and the depth of the tunnels are between 20 to 45 metres below ground. The project was divided into 6 contracts. The longest tunnel is 7.7 km. The main tunnel was constructed using Earth Balancing Pressures Tunnel Boring Machines. Lateral connector tunnels of 1000m in length were constructed by New Austrian Tunnelling Methods (NATM), using reinforced shotcrete. All the tunnels, shafts and other underground structures are provided with a Corrosion Protection Lining (CPL) composed of a primary High Density Poly-Ethylene (HDPE) lining attached to cast-in-situ concrete grout. The Owner of the project is the Public Utilities Board (PUB), the national water agency of the Republic of Singapore.

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