Stevens - Deep Cement Mixing

Ground improvement works are taking place around the Stevens Station for the past couple of weeks. Due to space constraints, only a single auger has been utilized in boring around the station box for the DCM works. Across the road, hoardings have just been erected along a boundary within the SCGS campus which has been designated and temporarily acquired as part of the construction of the new underpass and entrances. This site is expected to house the launch shaft for the CREG rectangular TBM which will bore the underpass beneath the canal, and dock at the escalator shaft.

The entrances and underpass have been promised to be completed 2 years ahead of the TEL station completion, in a bid to provide better connectivity between SCGS and the then-operational Downtown Line, in addition to an earlier reinstatement to the acquired SCGS site.

D-walling works continue at the Dalvey Launch Shaft.

Update Preview - Dalvey LS

T216 Stevens Station

Piling at Mount Pleasant (II)

Piling works have completed at the south launch shaft and the project team is preparing the site for excavation works. The priority now is to pile the north launch shaft - which will require a single slurry TBM to complete both bored tunnels toward Caldecott. The total tunnel excavation length is approximately 1.5km and would require about 2 years to complete.

Numerous handovers of the launch shafts would take place between the site's main contractor, adjacent T216 contractor as well as the trackwork contractor in the future. Delays are essential to be kept at minimum at every phase to prevent a snowball effect.

Aerial view of Mount Pleasant, T215

Caldecott Piles & Excavates (II)

Excavation works continue at the Caldecott site. 3 layers of struts have been constructed at its deepest point along the Thomson Cripple Siding. The shoring works at Caldecott are especially unique, where the contractor has bored down tubular concrete piles along the centreline of the earth retaining structure. The bore piles acts as columns supporting the horizontal struttings upon the commencement of excavation. With regards to material and method of construction, this is significantly different from the usual practice of an I-beam (aka king post) driven down to form the vertical component of the shoring structure.

Piling works continue closer to the north.

Caldecott Station, T213

Process of the conventional shoring works elaborated in this animation by Hirose (Singapore)