On  the 04.04.209 PUB, Singapore’s national water agency celebrated the launch ceremony of the first TBM for the EUR6.58 bn (SGD10 bn) Deep Tunnel Sewerage System (DTSS) Phase 2 project in Singapore.

The DTSS Phase 2 conveyance system will traverse 100km across the western half of the island, including the downtown area as well as upcoming developments in the Jurong Lake District, Tengah Town and the Greater Southern Waterfront. Comprising 40km of deep tunnels and 60km of link sewers, works on the system will be carried out through 18 contracts, including 5 design and build contracts for the deep tunnel that runs along the Ayer Rajah Expressway from Keppel Road to Tuas View Basin, and another 13 contracts for the link sewers. Tunnelling works are targeted to be completed by 2024. When completed, used water from homes, offices and industries will be conveyed via two tunnels - the 30km-long South Tunnel (domestic use) and the 10km Industrial Tunnel (industrial use) - to the Tuas Nexus for treatment and recycling into NEWater.

The first TBM for DTSS Phase 2, named after the Jalan Bahar work site will be lowered into a shaft, and will create a 3.5m-diameter tunnel 42m below ground. A total of 19 TBMs will be used for this project, to dig at depths of between 35m and 55m below ground and seabed, to create the deep tunnels and link sewers that range from 3m to 6m in diameter. More than 1.8 million cubic metres of soil will be excavated during the tunnelling works. Click here, here and sg/11 for the  tunnelbuilder archive and also visit https://www.pub.gov.sg/ .14/19.