Marina Bay Excavation (V)

Excavation works continue towards the formation level at the lower underplatform level. JGP works are taking place beneath the NSL and CCL tunnels, prior to the commencement of ground freezing and the subsequent SCL construction of the twin mainline stacked mined tunnels next quarter.

Marina Bay Station

Marina Bay Cast (IV)

Excavation and casting works have reached the lowest point of the station's structure at the platform level. Casting of the paid linkway roof and entrance substructures are ongoing.

T226 Marina Bay Station

Marina Bay Cast (III)

Structure of the station is now at the underplatform level of the Changi bound platform. Excavation work at all 3 new entrances and casting of the interchange linkways are in progress.

Marina Bay station

May Tunnel Progress

Tunnelling works for Stage 1 of the line will be completed by next month with the final 100m long Woodlands bound tunnel being driven between LS2 and Woodlands South station. Concurrently, the twin TBMs from Springleaf will breakthrough at the RTS Facility Building, completing the longest mainline drives (2km) under the TEL project.

TEL 1&2 Tunnel Chart, May 2017

T206: Completed Changi Bound tunnel between LS2 and WDS under the second drive of TBM 4

Marina Bay Excavation (IV)

Excavation works have presumably reached the upper platform level and is progressing down to the lower platform.

Commencement of shoring and excavation works at Entrance B

Marina Bay Cast (II)

Bulk excavation works for the NSL and CCL linkways are underway. The transfer level (B3) has been cast at the station and excavation works are progressing to the upper platform level.

Excavation of Circle Line linkway

November Tunnel Progress

Tunnelling works for the line have been ongoing for 15 months now. 11 bored tunnels have been completed.

TEL1/2 Tunnel Chart, November 2016

T202 - Breakthrough of TBM 2 at Woodlands Station on October 10. This is the first contract to complete all bored tunnel excavation

Marina Bay Excavation (III)

Excavation works are presumed to have passed the mezzanine level and nearing the transfer level (B3).

Excavation of the Circle Line paid and unpaid linkway (bottom left)

July Tunnel Progress

Tunnelling works are underway along all the projects along stages 1 and 2 of the line, with the first slurry TBM for the T211 project launched at Bright Hill this week. 5 bored tunnels have been completed by the first half of the year and a further 5-8 tunnels are envisaged to complete by year end.

TEL1/2 Tunnel Chart, July 2016

T206 - Launch preparations for the second drive of TBM 4 for reception tunnel 1 at Sembawang Airbase C&C (Photo credits: LTA)

Marina Bay Cast

RC works for the concourse slab are in progress at the Marina Bay station, while piling works commence for the interchange linkway to the North South Line. Sheares Avenue have opened between Maxwell Road and Central Boulevard, providing an interim linkage within the restricted zone of the CBD. The permanent road will be realigned towards the end of the project, and will be served by Entrance B and 2 ventilation buildings under the TEL project.

Opening of Sheares Avenue by the T226 team

Marina Bay Excavation (II)

The roof slab of the station has been fully concreted and excavation for the top-down construction of the station progresses. 2 separate updates taken in March and April have been compiled in this post.

March 8

Marina Bay Excavation

Construction of the diaphragm wall is nearing completion at Marina Bay and excavation of the station box has commenced.

Marina Bay D-walls (IV)

D-walling and ground improvement works continues at the Marina Bay station. The launch shaft seems to have completed excavation works and seems to be in the midst of preparation for the impending handover to T225. A separate shaft to the south is currently being excavated for the future mining of the linkway between TEL and NSL station, beneath the existing NSL and CCL tunnels, which will connect between this shaft and the TBM launch shaft.

Marina Bay D-walls (III)

D-walling works continue at the Marina Bay site alongside further ground improvements. The launch shaft at the north end of the station has commenced excavation.

Marina Bay D-walls (II)

Works on the diaphragm wall continues around the Marina Bay station box. Hoardings for the project boundary have been extended along the existing North South Line ventilation buildings, up to the Marina One project site. This is for the construction of the future linkway to the NSL.

Numerous fissure grouting points are scattered across the site as ground improvement works continue.

D-walling at T226 Marina Bay

Marina Bay D-walls

Intensive ground improvement works are taking place around the Marina Bay site, concurrent with the D-walling. Kori will supply and facilitate in the shoring works for this project. Photos in this update were taken on January 25.

T226 Marina Bay

Marina Bay Encloses

Contract T226 is for the construction of the new Marina Bay station. The excavated portion will be predominantly divided into 2 sections segregated by the existing North South and Circle Line tunnels. The excavated portion in the south will be for the main station box; the north portion would be for the TBM launch shaft for T225 and an access shaft to facilitate mining activities to link the 2 open cut areas. Extensive underpinning works to the existing RTS is required for the mined section. This is where the ground freezing is designed to be executed.

The new TSL Marina Bay station will have 3 new entrances and 5 basement levels with a formation level 38m deep. Entrance A (integrated with vent shaft 1) and Entrance C will be opposite the existing CCL entrance along Bayfront Avenue and Park Street respectively. Entrance B is located at the future intersection of Sheares Avenue and Park Street.

Existing RTS in Orange/Red, Existing site boundary in yellow, Proposed station box in cyan (Mined tunnels in blue)

Transfers and A&A to Existing RTS
In simplicity, 2 new dedicated connections will be made to the TSL from the existing NSL and CCL stations. The NSL linkage will be an open cut section parallel and west of the NSL station box along the former Marina Station Road. This linkage will be on the level as the NSL concourse B1.

The CCL linkage to be located east of the existing CCL station  along Bayfront Avenue will offer an unpaid and paid section. Located on the same level as the CCL concourse, the design makes use of existing knock out panel provisions made into the CCL station. The south knock out panel will feature the paid link (hence a reconfiguration of faregates within the CCL station). The north panel will feature the unpaid link.

T226 Taisei's site office and LTA's TSL Civil Team 4 project office completed to the west at 20A Park Street

Update Progress
The last 3 months have been spent on site clearing, as well as minor ground improvement works around the site area. 2 clusters of silos have been hoisted up south and west of the proposed station box. 4 crawler cranes, 2 trench cutters and a piling rig has been assembled on the site however no excavation has been taken by the d-wall machines yet.

With the recent closure of the former Marina Street and Marina Station Road, the site area has now been fully enclosed with the old roads cleared of traffic. The site office has been completed around 2 months back. The same building will house the project office of LTA's Thomson Line Civil Team 4. Here's a timeline of progress over the 3rd Quarter.

Marina Bay pre-construction

A few photos looking at the area before it gets torn up once again for the construction of the Thomson Line.

01 March 2014

17 April 2012 - Soil Investigations over the proposed station site

Contract Awards - T211, T221 & T226

LTA announced on Friday the award of three contracts for Stage 2 and Stage 3. This marks the award of all civil contracts for Stage 2 of the Thomson Line.

Contract T211 is for the design of, and subsequent construction and completion of Sin Ming station and tunnels to both neighbouring stations. Located near Bishan Park and Bishan Park Secondary School, the station will sit in close proximity to existing HDB blocks. This station was awarded to Penta-Ocean Construction Co. Currently, Penta-Ocean is building the Bendemeer station along Downtown Line Stage 3 and also won the contract to construct Woodlands North station along Stage 1. As this contract includes the interior design of the station, there are no renders to show.

Contract T221 is for the construction and completion of Havelock station. Located near the Holiday Inn Atrium hotel, this station will serve the Zion Rd and Havelock Rd area. It is expected to spur redevelopment that coincides with the demolition of the Zion Rd flats. Gammon Construction Limited, which built Chinatown station along Downtown Line 1 and won the contract to construct Mayflower station, will be in charge of this contract.

Entrance C for Havelock station

A view of the upper concourse at Havelock station. The lower concourse houses the fareline and ticket machines.

Entrance A for Havelock station

Contract T226 is for the construction and completion of Marina Bay interchange station. Sitting to the south of the existing Marina Bay Interchange complex which houses the North-South Line and Circle Line, this stacked side platform station will allow commuters to switch between lines easily right in the heart of town. Taisei Corporation, which completed parts of Circle Line stage 4 and Downtown station on Downtown Line 1, has won this contract. Expect long subways at this station when making connections to the existing North-South and Circle Lines.

A view of the concourse at Marina Bay interchange TSL station

Photo credits - URA & LTA