Gardens By The Bay - Tunnelling Completes

Tunnelling works for the T228 project have completed ahead of schedule, with the Hitachi Zosen EPBM breaking through the station d-wall from the return Changi bound tunnel drive earlier this month. RC works for the station's internal structure continues, with excavation works starting at entrance A. Preparations for the reinstatement of Marina Gardens Drive over the completed subway are in progress with implementation scheduled next quarter.

Gardens By The Bay station

Gardens By The Bay Cast (III)

Casting of the station structure is progressing at the concourse level up to the basement roof slab.

T228 Gardens By The Bay Station

Gardens By The Bay - TBM Reassembly

Tunnelling works for the Woodlands bound tunnel has completed from Gardens by the Bay station to the Marina East shaft, where the TBM has U-turned and commenced the second drive back towards the station. RC structure of the station is progressing between the platform and concourse levels.

Completed 700m long Woodlands bound tunnel beneath the Marina Channel

Gardens By The Bay Cast (II)

Casting of the permanent structure at the station is progressing at varying levels, with portions of the platform and tunnel walls along both bounds completed. The second phase of traffic realignment, to be implemented next month, will see Marina Gardens Drive reduced to a single lane dual carriageway.

Gardens By The Bay station site

Gardens By The Bay Cast

Casting of the base slab is progressing at the station box. The base slab is completed at Entrance C, and excavation of the adjacent subway has started. Initial drive of the TBM is presumably completed.

Gardens By The Bay Station

Gardens By The Bay - TBM Assembly

The Hitachi Zosen EPBM was lowered down the launch shaft in August and assembly works are underway beneath the road deck. Excavation works are mostly completed along the station box, and RC works have commenced for the base slab at the southern end.

T228 Gardens By The Bay station

Gardens By The Bay Excavation (II)

Bulk excavation works continue at the Gardens By The Bay station.

Gardens By The Bay Excavation

Excavation works are now underway at the station box. The diaphragm wall of the GBME shaft was completed in January and a pile test is currently being carried out on the surface. Excavation of the retrieval shaft would commence by the 2nd quarter.

Shoring and decking works for the first strut layer at the Gardens By The Bay station

Piling at Gardens By The Bay

The diaphragm wall for the Gardens By The Bay station has been completed and bored pile works on the foundation is taking place concurrent with the jet and fissure grouting. The launch shaft has been excavated down to about 9m now, with the realigned Marina Gardens Drive running above the decking.

Deep soil mixing activities continue along the tunnel route between the Marina Barrage and Gardens by the Bay, while construction of the diaphragm wall at the GBME retrieval shaft across the channel progresses.

Diverted Marina Gardens Drive for the pedestrian subway construction, scheduled for realignment by early 2017

Gardens By The Bay D-walls (IV)

Works on the diaphragm wall at the Gardens By The Bay station is nearing completion and excavation works should commence by early next year. A portion of the launch shaft has been partially excavated and shored in preparations for the decking to accommodate the upcoming diversion of Marina Gardens Drive.

The GBME retrieval shaft site across the channel has been hoarded up and a grab is on site to construct the d-wall panels. Ground improvement works continue along the stretch of tunnel route near Entrance C.

Preparations to divert Marina Gardens Drive

Gardens By The Bay D-walls (III)

Works on the diaphragm wall continues at the Gardens By The Bay site. Site clearing has commenced at the GBME retrieval shaft.

Excavation of the d-wall panel and insertion of the reinforcement bars - Bachy Soletanche Singapore, May 9

July 25

Gardens By The Bay D-walls (II)

Concluding our first quarter updates for the Thomson Line at the Gardens by the Bay station, D-walling works on the station box continues while ground improvement work commences at entrance C beside the Marina Barrage. Nishimatsu has affirmed with us the order of a single Hitachi Zosen EPB TBM for the T228 project which will be driven across the Marina Channel. Works have yet to commence on the GBME retrieval shaft.

Gardens By The Bay Station

Gardens By The Bay D-walls

Guide walls for the diaphragm wall trench have been installed around the perimeter of the station box, where D-walling works are underway. The T228 site office, together with several equipment and rest sheds have been constructed to the south. Preliminary SI works have also started around Entrance C and the GBME retrieval shaft.

D-walling and Deep Cement Mixing at T228 Gardens By The Bay - Bachy Soletanche Singapore, 31 January 2015

Aerial view of the D-walling and Drilling

Gardens By The Bay

Preliminary site clearing and ground investigation works have commenced by the contractor at the Gardens by the Bay site.

Contract T228 is for the construction of GRB station and twin tunnels across the channel to Marina East. Serving the other corner of the new downtown at Marina South, Gardens by the Bay station will be built beneath a future 2 lane dual carriageway road that will connect Marina Boulevard and Marina Gardens Drive. The road has yet to be named by the URA. With a fairly simple layout, the station will have a concourse and platform basement levels. Entrances A and B will be located on either sides of the new road. Entrance C to be linked by a subway will be located on a reserved portion of land between the Marina Barrage and Gardens by the Bay.

Entrance C to be built between the Marina Barrage and GBTB 

Tunnelling to Marina East

An EPB Machines will be procured for this contract. The TBM will be driven from a launch shaft east of GRB across the channel. A circular retrieval shaft - named Gardens by the Bay Marina East (GBME) will be built at the edge of Bay East under the contract. The GBME shaft will complement the docking of the TBM from GRB as well as the future E1 Marina East station under the Eastern Region Line project. T228 will handover the GBME shaft to the future ERL contractor throughout the whole of 2018 for the docking of the ERL TBMs before receiving possession of the shaft once again.  An escape shaft will then be constructed within the GBME shaft before it gets backfilled.

The tunnels will be driven straight down across the channel from the GRB launch shaft to GBME (foreground)

GBME Retrieval Shaft

Final Contract Awards

Today, LTA released the finalized contract awards for the last 3 stations on the Thomson Line. With this, all civil works contracts have been closed and awarded, along with the contract for trackworks, T250.

The contract for T219 which is for the construction of Orchard station and associated tunnels has been awarded to a joint venture between Penta-Ocean Construction and Bachy Solentanche. Both companies have been involved in the construction of Singapore's MRT network. Penta-Ocean is currently working on Bendemeer station along Downtown Line Stage 3 (DTL3) while Bachy Solentanche was involved in the construction of Telok Ayer and Bugis stations on Downtown Line Stage 1 (DTL1). Worth noting is that Penta-Ocean has been the only contractor to bag a contract in each stage of the Thomson Line (TSL).

A view of the exit along Orchard Boulevard

Concourse level view of Orchard interchange station

Entrance along Paterson Road view

Contract T227 is for the construction of Marina South station and associated tunnels. This contract was awarded to a joint venture between Sinohydro Corporation and Sembcorp Design and Construction. As with Napier station, this is Sinohydro's first foray into the Singapore MRT construction market.

Concourse level view of Marina South station

A platform view of Marina South station

Looking down a new road at Entrances A and B

The final contract, T228, is for the construction of Gardens By The Bay station (current terminus of the TSL) and associated tunnels (including tunnels across the Marina Channel, ending in Gardens by the Bay - Bay East). This has been awarded to a joint venture of Nishimatsu Construction and Bachy Solentanche. Nishimatsu Construction is currently involved in the construction of mainline tunnels between Kaki Bukit and Ubi stations on the DTL3 as well as reception tunnels from the Tai Seng Facility Building to Ubi and Bedok North stations.

Concourse level at Entrance C

Entrance C

Contract T250 is for the trackworks along the entire TSL. This has been awarded to CTCI Corporation.