Singapore’s Land Transport Authority (LTA) has said use of innovative methods has helped it to successfully overcome challenges with soft ground and limited space to construct Katong Park Station on the new 43km Thomson-East Coast Line.
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The contract for the construction of the station and connecting tunnels was awarded to Shanghai Tunnel Engineering in January 2016 with a value of SG$293.5M (£170M).
“The ground at Katong Park station is primarily composed of soft marine clay, which has the consistency of peanut butter,” said an LTA spokesman.
To minimise construction risks, selected stretches of the ground were strengthened to ahead of the tunnelling works and the diaphragm walls for the station were extend 65m below the ground, beyond the 28m depth of the station box.
Space was also at a premium at the site.
“The Katong Park station site is located at the major arterial junction of Fort Road, Tanjong Rhu Road and Meyer Road and is also surrounded by residential properties,” said the spokesman. “This created space constraints which prevent the construction of launch and retrieval shafts for the deployment of tunnel boring machines (TBMs).”
To overcome this limitation, the launch shaft was constructed at an empty site near the Singapore Swimming Club, which is a distance away from the construction site. Tunnelling works then proceeded through Katong Park station and continued towards the next station at Tanjong Katong. Excavation of the station box could only commence after tunnelling works were completed.
Due to space constraints, the tunnels at Katong Park station are stacked on top of each other to reduce the overall station footprint and avoid encroaching on adjoining private land.
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The Thomson-East Coast Line is due to become operational in states from this years through to 2024 with Katon Park due to open in 2023. The new line will have seven interchange stations linking the TEL to all five existing metro lines in Singapore.