Tuesday 29 September 2015

Piling at Napier (III)

Piling works continues along the center perimeter of the Napier station following the traffic diversion in July. Excavation of the launch shaft is ongoing.

Excavation of the launch shaft

Monday 28 September 2015

Stevens D-walls (II)

Excavation of the Dalvey launch shaft is now midway completed. The slurry treatment plant is in the midst of installation beside the shaft. D-walling and piling works continues at the Stevens station. Updates for the launch shaft at Mount Pleasant can be found here.

Excavation and grouting at the Dalvey launch shaft

Saturday 26 September 2015

Haze Contingency Measures

In light of the recent deterioration of the haze conditions across the country, preventive actions have been stepped up to protect the welfare and safety of the workers exposed to the hazardous outdoor conditions. The T206 Launch Shaft site was visited by the media yesterday afternoon to find out more about the numerous precautionary measures that have been implemented at the site.

Friday 25 September 2015

NFM TBM - Factory Acceptance (III)

Another slurry machine has been completed at NFM's Shenyang factory for Daewoo's T216 project.

NFM Slurry TBM for T216

Thursday 24 September 2015

Piling at Mount Pleasant (IV)

Piling works continue for the Mount Pleasant station. The launch shaft for T215 has been excavated down to the S4 layer and has almost reached the formation level.

The Mount Pleasant site is unique to see 2 different contracts handling the mixed-ground bored tunnel works on either ends with their dedicated launch shafts and slurry TBMs, the first such dividend in the scope of works for the MRT construction. 2 separate STPs are in the midst of assembly alongside each other north of the site as a result.

Tuesday 22 September 2015

Caldecott Excavation (II)

Deep excavation works continues at the Thomson Cripple Siding. Installation of struts have almost reached across the entire length of the Caldecott station box.

Rock has been interfaced at this stage of the excavation, and expertise have been called in with the use of special detonators to mitigate the vibration and minimize ground disturbance to the neighbouring skyscrapers, and most importantly the adjacent operational Circle Line.

T213 Caldecott

Monday 21 September 2015

Upper Thomson D-walls (II)

Trenching of the diaphragm wall as well as boring works for the king posts continues at the Upper Thomson Station. The new canal is currently being constructed. Excavation works at the Upper Thomson Launch Shaft is halfway completed and grouting is taking place at the ends of the launch shaft ahead of the projected TBM launch early next year. The slurry treatment plant is also being assembled.

Sunday 20 September 2015

Piling at Bright Hill (IV)

Piling together with sewer diversion works continue at the Bright Hill Station.

A&A works for POB between BRH and UTS
The project team has commenced preliminary works for the alternation of the POB along Upper Thomson Road at Windsor Park. A new set of staircase will be built for the bridge, with the former to be demolished to make way for the bored tunnels.

Replacement POB between BRH and MFL
Works for the replacement POB at AMK Avenue 3 are ongoing. No structures have surfaced yet.

Bright Hill Station

Friday 18 September 2015

Piling at Mayflower (V)

Piling works are entering its final phase at the Mayflower station. The stage 3B traffic diversion was implemented at the site last Saturday to make way for the construction of the remaining bored piles. The diversion will last until the end of the year.

Tuesday 15 September 2015

Lentor Cast

Lentor Station will be adopting the top-down construction method. The basement roof slab of Zone 1A was successfully concreted at the start of this month. Timelapse of the rebar installation throughout the past month is included below.

Excavation works for the launch shaft has reached the S3 layer and is nearly completed. The slurry treatment plant is also in the midst of assembly works.

Lentor Station

Thursday 10 September 2015

Tagore Excavation

Excavation works at the Tagore C&C tunnel site is nearing completion. The north launch shaft is completed as well and sees the recent installation of the second gantry crane at the site. The third and final TBM should arrive by this month and tunnelling works towards Springleaf could commence by year end.

Precast lining segments are visible at the south launch shaft facilitating the recent commencement of tunnelling works towards Lentor. The second TBM is believed to still be undergoing alterations to the internal electrical components and should commence mining within the next few days.

Tuesday 8 September 2015

Springleaf D-walls & Piles (II)

Springleaf sees the continual trenching and construction of the diaphragm wall and bored piles forming the earth retaining system, in addition to deep soil mixing activities. Excavation works have commenced at the north launch shaft which will be handed over to the T207 project. Excavation has reached the S3 layer and the launch shaft should be handed over by year end.

Excavation of the launch shaft at Springleaf station

Sunday 6 September 2015

T207 Excavation

Excavation works commenced at the RTS Facility Building site last month. At the escape shaft site, excavation has reached the formation level and the adit tunnel connecting the ES to the future mainline tunnels are being excavated, way in advance of the tunnel drive.

Ground Improvement Works
Shimizu have commenced ground improvement works above CP5 and CP6 along Mandai Road (near Meng Suan Road) ahead of the commencement of tunnelling between Springleaf and the RTS FB. Ground improvement works by the contractor have also started beside the Springleaf launch shaft.

Excavation at the RTS Facility Building

JTSC TBM - Factory Acceptance

The JTSC TBMs for the T207 project were signed off at the factory acceptance test held north of Suzhou earlier this week. 4 EPB machines were procured by Shimizu for a combined tunnel drive of approximately 6km in length. 2 of these machines will execute the single longest tunnel drive along the Thomson Line between Springleaf Station and the RTS facility building, stretching 2km.

Tunnelling works should commence around the 2nd quarter of 2016.

Scaled model of the T207 JTSC EPBMs
Factory Acceptance Test (Cr: Leong Wei Loon)

Friday 4 September 2015

Mandai Depot & T206

Excavation works progresses along the cut and cover structures along the T206 project.

Launch Shaft 1 & 2
The Changi Bound TBM has completed assembly works within the adit tunnel of LS2 and will launch by the middle of this month. Excavation of LS1 has completed and the team is now blasting the horizontal section on both ends for the adit tunnel. The depot-bound STEC EPBM is slated to commence tunnelling along RT3 by the end of the year.

SBAB C&C & Escape Shaft 2
The ES2 structure now has the entire S1 layer shored along its entire length. The north launch shafts at the Sembawang Airbase C&C tunnel has now been excavated down about 20 meters, close to the formation level with an approximate reduced level of 95.000. The gantry cranes have been installed around the launch shafts, and tunnelling here should commence by year end with the TBMs arriving and assembling in the 4th quarter.

Mandai Depot
Columns along the north end of the stabling area are currently being cast. The structure will feature 45 parallel tracks, more than thrice the width that of the Downtown Line's Gali Batu Depot. Each track will accommodate for 2 x 4 passenger cars to effectively house the entire fleet of the 43km Thomson-East Coast line. The depot has been intentionally over-designed for future fleet expansions should the need arises.

Mandai Depot, T201

Thursday 3 September 2015

Woodlands South Excavation

The first phase of the D-wall has been completed on the north face of the Woodlands South station. Excavation works at the S1 layer is in progress. The station will be constructed top-down, and preparations for casting of the roof slab is visible at Entrance D. The next traffic diversion should be implemented by early 2016.

Tuesday 1 September 2015

Woodlands Excavation

After a year of piling, the T203 project team have commenced excavation works at the crossover tunnel. Sewer diversion works around the Avenue 2/5 junction are still ongoing and will complete soon. Piling works are now concentrated at the site of the vent shafts and cooling tower on the north end of the station box.

A large amount of rock lies shallowly beneath the T203 project site, and the overall excavation process is envisaged to be one of the slowest among all the projects.

Commencement of excavation at the Woodlands crossover tunnel