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Singapore awards start Thomson Line works 29 Jul 2013
Peter Kenyon, TunnelTalk
Construction of the new 30km long entirely underground Thomson Line has started with award of the first two contracts by Singapore's Land Transport Authority (LTA).
First two Thomson Line contracts awarded

First two Thomson Line contracts awarded

Contract T213 for construction of a new Caldecott Station to provide an interchange connection with the Circle Line, and its associated tunnels, is awarded to Samsung C&T Corporation of South Korea for a contract sum of about Sing$285 million. Construction is scheduled to start immediately, in August 2013, and is targeted to be complete in 2020.
Samsung C&T Corporation is currently involved in LTA projects including the construction of the MRT (mass rapid transit) Downtown Line 3 Expo and Upper Changi Station, and design and construction of the Marina Coastal Expressway highway.
At the far north end of the line, Contract T206, comprising about 7km of TBM twin bored tunnels plus another 550m of cut and cover tunnel, is awarded to Shanghai Tunnel Engineering Co for a contract sum of about Sing$421 million. Twin bored TBM tunnels will be excavated between Woodlands Station, Woodlands South Station and to a set of crossover tunnels adjacent to Woodlands Ave. Twin TBM bored tunnels will also link Woodlands Station to the Mandai Depot. Scheduled also to start in August (2013), the works are targeted to be complete in 2019.
Shanghai Tunnel Engineering Co of China has extensive experience in transit projects in Singapore and is currently involved on the design and construction of Newton Station and tunnels for Downtown Line 2, construction of tunnels between Tampines East Station and Upper Changi Station for Downtown Line 3 and construction of viaducts for the Tuas West Extension and Gul Circle Station.
Thomson Line, as it integrates with the existing network

Thomson Line, as it integrates with the existing network

Designed to enhance rail connectivity in the north-south corridors to the Central Business District (CBD) and developments in the Marina Bay area, the 30km Line is fully underground with 22 underground stations, including six interchange stations at Woodlands, Caldecott, Stevens, Orchard, Outram Park and Marina Bay.
Construction of the Line, largely as twin TBM bored running tunnels between open-cut underground stations, is divided into 23 civil construction contract based on 100% design documents procured and prepared by LTA. These comprise 15 station plus bored or cut-and-cover running tunnel contracts; two tunnel only contracts; five station only contracts; and the depot contract.
Artists impression of the Caldecott Station interior

Artists impression of the Caldecott Station interior

Further construction contracts are to be let during the coming months to meet a three-phased completion schedule that will see the first three-station section from Woodlands North to Woodlands South complete by 2019, the second six-station section between Springleaf and Caldecott completed by 2020, and the final 13-station stretch from Mount Pleasant to Gardens by the Bay completed by 2021.
In the meantime, work continues on the 41km Downtown Line Phase 3 for a planned opening in 2017; the 16.6km long, 12 station Downtown Line Phase 2, excavation of which started in mid-2011; and the first phase of the Downtown Line on which excavation is complete and services are expected to open by the end of this year (2013).
References
Singapore and Malaysia hungry for TBMs - TunnelTalk, July 2013
First of six Robbins EPBMs set in Singapore - TunnelTalk, September 2012

           

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