Nishimatsu Construction has chosen Denmark-based engineering firm COWI to design the Tampines North to Defu Station section of Cross Island Line metro in Singapore.
Cowi called this as a “significant win” that builds on its delivery of the Deep Tunnel Sewer System, which is now close to completion.
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This project will see deployment of one of the biggest tunnel boring machines (TBMs) ever used in Singapore.
According to Cowi, there is a need for careful planning given that the tunnel passes under a military airport, public roads and bridges.
Anticipated to open in 2030, the 50km Cross Island Line (CRL) will be the longest fully underground line in Singapore.
CRL is expected to carry around 600,000 commuters daily.
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By GlobalDataCowi, in collaboration with Nishimatsu Construction, has secured a package of work that consists of a 2.9km bored tunnel, 300m-long cut and cover tunnels, and a two-storey facility building with five basement levels to offer electrical and mechanical services.
A TBM with a 12.6m diameter cutting head will be deployed to build a single tunnel with two tracks.
Cowi’s international transportation unit senior vice president Jotham Vizard said: “As TBM technology improves, large diameter tunnels are becoming more common, and this project maintains our leading position in the large diameter market.”
According to Cowi managing director in Singapore Vince Goh, this project comes with several technical challenges other than the large diameter tunnel itself.
“Among others, the tunnel will go underneath a military airport with sensitive fibre-reinforced pipe, runway, taxiway, apron, airport structures which increase limitation in ground movement during both bored and mined tunnelling operation,” he said.
“Moreover, any TBM cutterhead intervention beneath the airbase will need to be pre-planned and in hyperbaric environment due to the depth. Multiple closely spaced adits for future underground infrastructure is also part of the challenge. The tunnel will also go under public roads and will under cross the Sungei Serangoon vehicular bridge and Kallang-Paya Lebar Expressway viaduct.”
Construction work is expected to commence in June.
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Image: This project will see deployment of one of the biggest tunnel boring machines (TBMs) ever used in Singapore. Credit: Cowi.
