POB Launches @ Napier

The temporary Pedestrian Overhead Bridge is successfully up at Napier Road following 2 nights of beam launching. The segment over the carriageway bound for Orchard was first launched up on Tuesday morning. The second segment of steel was then launched earlier this morning over the westbound road. The temporary bus bay and shelter along the eastbound road is almost completed, and would open anytime soon.

M&E works to the temporary bridge would take place together with the construction of the bridge's staircase from now. The new temporary bridge could possibly be operational by year end, following which the existing bridge would be demolished. This is the second POB to be demolished along the line.

Completion of beam launching along Napier Road this morning

The photos below show the progress of the beam launching throughout the week.

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

Marina South Hoards Up

Contract T227 is for the construction of Marina South station, twin bored tunnels north to Marina Bay and a section of cut and cover tunnels from Marina South to Gardens By the Bay. Designed to serve a corner of the future development at Marina South, the station is located at an angle parallel to the MCE under the proposed extension of Marina Mall (road). The design takes into consideration the future Singapore Underground Road System (SURS) which will run beneath Marina Mall such that the concourse & platform level would not be obstructing the future road tunnel.

The station will be 20m deep with 4 basements - UPN linkway (B1), Concourse (B2), Mezzanine (B3) and Platform (B4). Entrances A,B and C will be located along Central Boulevard whilst Entrances D and E will be along Marina Boulevard. 5 vent structures will be built for the station.

Hoardings partially hoarded up around an empty field where the station will be

Bored tunnels
An EPB TBMs will be double driven from a launch shaft at Marina South 850m to Marina Bay. The tunnels will be in a semi-stack configuration when it undercrosses part of a designed pile-free zone of the Common Service Tunnel (CST) Phase 3B that has been specially catered for the tunnels to be bored through. 1 semi-stacked cross passage will be built south of the CST intersection. This is the 48th and final CP to be built within the TSL tunnels.

Cut and Cover tunnels
The tunnels connecting Marina South to Gardens by the Bay (GRB) will be constructed fully by open cut. This is for the construction of a cripple siding and crossover track between both stations. 650m long, the C&C portion is also the 5th and final Temporary Staging Area (TSA) site along the line.

Curvature in the site clearing can be seen for the future Cut and Cover tunnels to GRB

Ccontract boundary between T227 and T228

Update Progress
Being under the last batch of contracts to be awarded, minimal site clearing and hoarding works can only be seen at this point in time. Yongnam had also recently been awarded the subcontract for shoring works under T227.