Sunday, 21 December 2014

T206 Piles and Excavates

We gear up closer to the commencement of tunnelling works for the Thomson Line in this update. Excavation works for the Launch Shaft 2 (LS2) has just started after 6 months of drilling and piling. STEC has altered the design of the launch shaft from an initial rectangular box proposed by the A/E consultant into a double circular cell - similar to the proposed Dalvey LS at Stevens. The design omits the use of any temporary struts while a permanent concrete beam supports the compression forces of the shaft at its center. This is a significant milestone for the project and we expect excavation works to continue on throughout the next quarter. Works have yet to start on Launch Shaft 1.

T206 Tunnel Chart
Proceeding south, piling works are also in full swing at the Sembawang Airbase (SBAB), escape shaft and Mandai Depot. Kori has been subcontracted by STEC for shoring works under T206. In addition, Kimlun of Malaysia will be supplying the precast tunnel segments for the 10 tunnels within this contract.

Excavation of Launch Shaft 2
Piling works at the Sembawang Airbase C&C site and Avenue 12 Escape Shafts
Piling at Mandai Depot
Aerial view of escape shaft, SBAB and MDD (left to right)
Close up of escape shaft site
Launch Shaft site
No works started on LS1 yet

LS2 will see 2 TBMs do an initial drive to the Woodlands Station (northwards)
The 2 TBMs will be redriven southwards to Woodlands South in a second and much later drive (foreground)
RT3 will launch out of LS1 and head straight to the Depot, going under Drive 17 (right)

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