Tuesday, 1 August 2017

August Tunnel Progress

The 2km long twin tunnels between Springleaf station and the RTS Facility Building have completed under the T207 project. These are the longest single mainline tunnel drives achieved under the MRT construction since the Circle Line 4 project a decade ago. TBM 2 brokethrough the facility building overnight (Jul 31), while TBM 1 completed the Woodlands bound tunnel on July 9.

Together with the completion of TBM C2 at Springleaf under the T208 project, bored tunnelling works are officially completed under the Civil Team 1 projects. With 4 TBM drives completed in July, 6 TBMs remain between 5XO and Caldecott station under Stage 2 of the line.

Envisaged completion for remaining 6 TBMs under TEL2:
T209 TBM 1/2 - Q4 2017
T211 TBM 1 - Sep 2017
T212 TBM 1 - Q4 2017
T212 TBM 2/3 - Q1 2018

TEL1/2 Tunnel Chart, July 2017
T207: TBM 1 breakthrough at Facility Building on July 9 (Photo: Raju)

Wednesday, 19 July 2017

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

Tuesday, 18 July 2017

Marina South - TBM Assembly

The 38th and final TBM for the Thomson stretch of the line has finally been lowered and is being assembled at the launch shaft. The CREG EPBM will drive the 750m Woodlands Bound tunnel towards Marina Bay first. Structure of the station continues to be cast, with installation of rebar ongoing at the roof slab level at the highest point. 

Marina Boulevard has been realigned back for shoring and excavation works to proceed for the interconnecting section between the station and cut and cover tunnel. Realignment of Marina Grove is being prepared for similar works to be carried out at the T228 interface.

Marina South Station

Monday, 17 July 2017

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

Sunday, 16 July 2017

Shenton Way Excavation (II)

Structure of the station has now progressed to the underplatform level of the Changi bound platform. Conversion to main drives are underway for both TBMs.

Shenton Way station

Friday, 14 July 2017

Maxwell Excavation

Excavation works are in varying progress across the station box as the next realignment of the South Bridge, Neil and Maxwell Road kicks in.

Maxwell Station

Wednesday, 12 July 2017

Outram Park Cast (IV)

Structure of the station has reached the underplatform level. Excavation of the linkways and initial drive of the Woodlands bound TBM towards Havelock are in progress.

T222 Outram Park site

Tuesday, 11 July 2017

Havelock Excavation (III)

Rock excavation works continue at the station box, with works commencing on entrance B.

Havelock station overview

Monday, 10 July 2017

Great World Excavation (III)

Excavation works are still in progress from the previous quarter towards the formation level. The replacement shields for both TBMs have arrived on site, and an acoustic shed is being constructed over both launch shafts.

T220 station top-down

Sunday, 9 July 2017

Orchard Excavation (II)

Excavation works are in progress at entrance B and the cut and cover tunnel. The second phase of bored piling works beneath Paterson Road is underway for the underpass construction to entrance C.

Next phase of traffic diversion along Paterson Road implemented for the subway bored pile construction to Wheelock

Saturday, 8 July 2017

Orchard Boulevard Excavation (II)

The lower concourse structure has now been completed and the final phase of excavation works are proceeding down to the formation level for the casting of the underplatform and platform levels. Pipe jacking works are underway for subway B.

Last stage of excavation works at Orchard Boulevard station

Friday, 7 July 2017

Napier Excavation (II)

Bulk excavation works continue at Napier station.

Excavation works at station box

Tuesday, 4 July 2017

Stevens D-walls (VI)

Construction of the diaphragm wall continues with around 45 more panels to be constructed for the station and Entrance B. Stevens is the sole station along the Thomson stretch with its earth retaining structure incomplete, and works are targeted to complete by the 4th quarter.

Preparations of the launch shaft structure for the arrival and assembly of the RTBM in Q3

Sunday, 2 July 2017

Mount Pleasant Cast (II)

Structure of the station is proceeding up to the Concourse level. TBM S-936 had been re-lowered into the launch shaft in May for the commencement of tunnelling works on the Woodlands bound tunnel.

Mount Pleasant Station

Saturday, 1 July 2017

Caldecott Cast (IV)

The first section of roof slab has been completed at the southern end of the station as structural works take shape.

Caldecott Station

Friday, 30 June 2017

Upper Thomson Excavation

D-walling works for the station was completed earlier this quarter and the associated silos have been dismantled. Bored piling works for the station's foundation are taking place at the south side of the station, while excavation works on the north end has reached the concourse level.

Bored piling works around entrance D

Thursday, 29 June 2017

Bright Hill Excavation (II)

Excavation works at the station box are ongoing to the platform level, with the concourse slab completed. The Woodlands bound tunnel to Mayflower has presumably been completed by TBM 4, and the remaining 3 TBMs are anticipated to complete by the next quarter.

Ground improvement works at the extracted H-pile foundation of the former POB along Upper Thomson Road

Wednesday, 28 June 2017

Mayflower Cast (IV)

Structural works for the station and entrances are largely completed. A realignment of Street 11 has taken place for the construction of the underpass link from the station to entrance D.

Basic structure completed at entrance D & realignment of AMK St 11 for the remaining subway construction

Tuesday, 27 June 2017

Lentor Cast (III)

Construction of Entrance C has started adjacent to the launch shaft. Excavation works for the station is almost completed with structure of the platform level presumably taking shape.

Construction of Entrance C,D and E

Tuesday, 20 June 2017

Tagore Backfill

Filling works are in progress over the completed structure at Tagore which would site the 1 hectare trackworks staging ground to come. The final TBM C2 is about 75% completed and will complete by the next quarter.

Backfilling works and de-strutting over the concourse slab 

Springleaf Cast (II)

Structure of the Springleaf station is taking shape with the first section of roof slab completed.

Springleaf station

Sunday, 18 June 2017

Facility Building Cast (III)

The full face rock conditions experienced by the final 2 EPBMs from Springleaf have significantly hindered the progress over the last quarter with an average advancement rate of a single ring building per day. TBM 1 is about 30 rings from breakthrough and should complete within a month's time.

Tower crane erected to facilitate the RC works of the facility building superstructure

Saturday, 17 June 2017

TEL1 Tunnelling Completes

Bored tunnelling works have completed this month under Stage 1 of the project between Woodlands North, Mandai Depot and the Sembawang Airbase cut and cover tunnel site. 12 tunnel drives were launched using 3 Earth Pressure Balance machine 4 Slurry TBMs which bore through the weathered Bukit Timah Granite to complete the 8km network of mainline and reception tunnels beneath Woodlands.

For most of the tunnels, the basic structural completion (BSC) have already been achieved with the first stage concreting (FSC) for the track bed, together with brackets installation for the various SWC. Trackworks are slated to commence through the tunnels by the end of 2017, with the remaining SWCs gaining access from the 2nd half of 2018.

Mandai Depot Stabling Yard

Tuesday, 13 June 2017

Woodlands South Cast

Concourse slab of the station structure has been cast and excavation works are progressing down to the platform.

Excavation works of UPC to the future Woodlands Health Campus

Woodlands Cast (III)

Casting of the concourse level is midway completed across the station box, while excavation works at Entrance F, G and the subway link within the bus interchange have commenced.

T203 Woodlands site

Woodlands North Cast (IV)

Casting of the concourse slab at the station is largely completed and structural works are progressing up to the roof level of the station. The south crossover tunnel is completed and filling works are taking place to the roof level. Structural works on the overrun tunnel are underway.

Filling works at the completed south crossover tunnel

Sunday, 7 May 2017

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 3

Friday, 21 April 2017

Gardens By The Bay Cast

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

Thursday, 20 April 2017

Marina South Cast

Casting of the station has reached the concourse level, while portions of the C&C tunnel roof have been completed.

Overview of the T227 open cut excavation site with T228 & T302 in the background

Wednesday, 19 April 2017

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

Tuesday, 18 April 2017

Shenton Way Cast (III)

Excavation works have reached the plantroom level and is progressing down to the upper platform level. Assembly of TBM 1 has completed and commencement of tunnelling works to Maxwell are slated to begin tomorrow.

Concourse slab completed at the station

Monday, 17 April 2017

Maxwell Cast

Bulk excavation and casting work continues at the Maxwell station.

Roof slab completed at zone 3 (bottom)

Sunday, 16 April 2017

Outram Park Excavation (II)

The concourse slab has been cast and excavation works for the station are now at the platform level of the station. The final realignment of Outram Road was carried out last month for the excavation of the new interchange linkways, and would remain in position till the end of the project. TBM2 has almost completed the Changi bound tunnel towards Maxwell.

TBM 1 re-assembly works at launch shaft towards Havelock

Saturday, 15 April 2017

Thursday, 13 April 2017

Great World Excavation (II)

The concourse slab for the station has been completed and excavation works are now progressing down to the platform level. Bored tunnel works are underway in both directions towards Orchard and Havelock stations.

Excavation works proceeding down to the platform level

Wednesday, 12 April 2017

Tuesday, 11 April 2017

Orchard Boulevard Cast (III)

Excavation works have reached the lower concourse level and casting of the structure is progressing. Excavation and casting of the platform and underplatform levels will be carried out through the year. Excavation works for the mining shaft for the underpass leading to entrance B have commenced at the facade of Camden Medical Centre along Grange Road.

Overview of T218 site

Saturday, 25 March 2017

Napier Excavation

Bored pile works have completed at the station and excavation works progresses.

Excavation works at station

Friday, 24 March 2017

Stevens D-walls (V)

The second portion of the stage 3 traffic diversion works had been implemented along Stevens Road last week, allowing for the construction of the remaining half of the station's diaphragm wall. Excavation works have commenced at Entrance C&D. 

The project's first tunnel completion for the 300m southbound tunnel between Dalvey LS and the station is due next week (TBM 4). Lack of soil profile understanding beneath private properties and portions of unfavorable geological conditions are hindering the tunnel progress towards Napier, as well as between Mount Pleasant and Stevens station.

Commencement of excavation works at Entrance C&D & Rectangular TBM launch shaft

Thursday, 23 March 2017

Mount Pleasant Cast

The platform and mezzanine levels of the station have been cast and RC works will progress up to the concourse level in the next quarter. TBM S-936 has also completed the first Changi bound tunnel towards Caldecott earlier this month.

Mount Pleasant Station

Friday, 10 March 2017

Caldecott Cast (III)

RC works for the station structure is progressing up to the concourse level.

Cross beams cast at Mezzanine 2 level (GL9.5-11.5)

Thursday, 9 March 2017

Piling at Upper Thomson (II)

Diaphragm wall structure for the station is finishing up and construction of the roof slab is being done. TBM 1 has completed its first drive to Upper Thomson station and relaunch for the second drive is being prepped.

D-wall, bored pile, JGP, WSM and excavation works for roof slab construction taking place concurrently at Upper Thomson

Wednesday, 8 March 2017

Bright Hill Excavation

Excavation works are in full swing at the station box. RC roof of the north cut and cover tunnel has also been cast. Main drive of the 4 TBMs are progressing and should be completed from the end of Q3 2017 onwards.

Excavation works in full swing at the station box

Tuesday, 7 March 2017

Mayflower Cast (III)

Basic structure of the entrances are progressively completing accompanied by backfilling works on the surface.

Entrance D backfill & casting of surface perimeter

Monday, 6 March 2017

Sunday, 5 March 2017

Tagore Cast (IV)

Structure of the concourse slab is mostly completed for the station box. TBM B drive is over 85% completed now and breakthrough at Springleaf is expected in early Q2. TBM C2 will follow suit a quarter later. Staging works for trackwork will commence at Tagore by year end with handover of site possession to CTCI at the later part of the year.

Concourse slab cast at Tagore

Friday, 3 March 2017

Springleaf Cast

RC works for the platform and concourse level are taking place at the station box following the completion of excavation works.

Excavation works completed at the Springleaf station

Thursday, 2 March 2017

Facility Building - TBM 3 Breakthroughs

Piling works have recommenced at the facility building site, this time for the superstructural works. TBM 3 has broken through the facility building site from SBAB, while TBM 4 is meters away beneath the Mandai Lake Flyover awaiting settlement remedial actions. TBM 1 and 2 from Springleaf have almost reached the facility building and would complete by the 2nd quarter.

TEL1&2 Tunnel Chart, March 2017
Site filled back for bored pile works for facility building