J107 - Gek Poh & Tawas update Q1 2024

 

21 March 2024 - A view of Gek Poh station as at end-Q1 2024.

21 March 2024 - A view of Tawas station as at end-Q1 2024.

Contract J107 is for the construction of Gek Poh and Tawas stations and is the last of the contracts for phase 1 of the Jurong Region Line (JRL). Progress over the first quarter has been swift with works at both stations advancing visibly. Preparatory works were also taking place to commence viaduct span launching across the Pan Island Expressway, just south of the Tawas station. More after the jump.

JW1 - Gek Poh
Over the course of the past quarter, work at Gek Poh station has seen the installation of the concourse slab precast arms make progress. At the beginning of the quarter, approximately 6 pairs of arms had been installed, leaving 4 pairs remaining. By the end of the quarter, only 2 pairs remained to be installed. The installation process involves the erection of supporting truss frames on the road side table and other hanging frames from the station's central piers to allow the precast arm to be suspended in place. Steel cables are installed before rebar is put in place and concrete poured in. Once the concrete has been set, the tensioning work is carried out before the trusses and frames are removed, allowing the arm to remain suspended in place.

Besides the launching of the precast arms that will support the concourse slab, works have also proceeded concurrently with the casting of the concourse slab as well. This involves the use of precast beams which are installed on the slab arms. A layer of rebar is thereafter placed atop and concrete poured to form the base of the concourse slab. Further layers will be added later on before tiles are installed at the final stages to finish off the station. 

Casting of the station's pier columns was also conducted concurrently. The pier columns will eventually support the trackbed in the station's median, with further arms cast to support the platform slabs on either side of the trackbed.

21 January 2024 - An aerial view of Gek Poh station at the beginning of Q1.

21 March 2024 - An aerial view of Gek Poh station at the end of Q1.

21 January 2024 - Gek Poh station as seen from street level.

21 January 2024 - A close up view of the southern-most concourse level arms installed.

21 January 2024 - Further arms for the concourse level installed.

21 January 2024 - An aerial view of portions of the concourse slab towards the northern end that
have been cast. Precast beams are installed upon which the slab is thereafter cast.

21 January 2024 - A view of the concourse slab arms and precast beams.

29 February 2024 - A view of the station's concourse slab arms seen from a passing bus.

29 February 2024 - Viaduct spans to the north of the station.

29 February 2024 - An aerial view of the northern end of the station. Formwork to facilitate the
casting of the concourse pier columns is being installed.

29 February 2024 - An aerial view of the remainder of the station.

29 February 2024 - A view of viaduct piers towards the south of the station.

29 February 2024 - Jurong West Street 75 twisting and turning below the station under construction.

29 February 2024 - The underside of the precast beams of the station concourse level.

21 March 2024 - An aerial view of the northern end of the station. The 2 northern-most pier
columns have since been cast.

21 March 2024 - A close up view of the 2 northern-most pier columns already cast and a third
in the process of being cast.

21 March 2024 - An aerial view of the northern end of the station with the viaduct span ready
to be connected to the station in time to come.

21 March 2024 - A view towards the southern end of the station with 4 concourse arms remaining
to be installed.

21 March 2024 - The northern end of the station with viaduct span ready to be connected to the
station.

21 March 2024 - An aerial view of the southern end of the station.

JW2 - Tawas
Tawas station adopts a similar design to that of Gek Poh, located further south. Both stations will feature a side platform design, supported by a row of central pier columns. As the platform level is supported by the central row of pier columns, this frees up the concourse slab to be column-free.

Progress at Tawas station over the first quarter of 2024 has seen the continued casting of pier columns in the centre of the station that will form the trackbed and platform slab support. At the end of the first quarter, only approximately 3 pier columns were left to be cast at concourse level before all pier columns for the station are completed.

15 January 2024 - A view of Tawas station from across the Pan Island Expressway (PIE) in early-Q1.

29 February 2024 - A view of Tawas station from across the PIE in mid-Q1.

21 March 2024 - A view of Tawas station from across the PIE in end-Q1.

29 February 2024 - An aerial view of Tawas station from Cleantech Park in mid-Q1.

29 February 2024

19 March 2024 - An aerial view of Tawas station from Cleantech Park in end-Q1.

19 March 2024 - A close up view of Tawas station with the trackbed under construction.

19 March 2024 - The southern-end of Tawas station with piers for the PIE crossing in view.

22 March 2024 - A view of the northern-end of Tawas station.

Pan Island Expressway special crossing
Just immediately south of Tawas station is a special viaduct crossing over the Pan Island Expressway (PIE). Work initially started at the southern end with the construction of the special span pier and a secondary pier which will serve as a movement expansion joint pier. Over the course of the quarter, the crosshead for the pier was cast and formwork removed ahead of segment launching. By the end of the first quarter, several precast double-cell segmental box girders could be seen on site near the Tawas station. Segment installation would begin in the following quarter.

15 January 2024 - A view of the southern pier crosshead being cast in early-Q1.

15 January 2024 - The northern pier columns are not yet visible.

29 February 2024 - A view of the PIE crossing in mid-Q1.

29 February 2024 - Pier columns for the special crossing south of the PIE.

29 February 2024 - Formwork coming off the pier crosshead.

29 February 2024 - No pier columns are visible on the northern side of the PIE in mid-Q1.

29 February 2024

21 March 2024 - A view of the PIE crossing site in end-Q1.

21 March 2024

21 March 2024 - Double cell precast segmental box girders for the crossing staged on the
northern side of the PIE.

21 March 2024

21 March 2024 - Piers for the special crossing on the southern side of the PIE.

Contract J107 viaducts
Viaducts form an integral part of the JRL, allowing trains to traverse the line between stations, gliding easily above congested roadways. Work on the viaducts for contract J107 have progressed well with several pier columns reaching completion and work transiting over to the construction of the pier crossheads. Progress has been made at several locations and the contract is one of a handful that have had viaduct spans successfully cross over road junctions.

21 January 2024 - A view of the portal pier for the contract, demarcating the contract boundary
with contract J105 to the south.

21 January 2024 - A view of portal piers just outside Westwood Primary School.

21 January 2024 - Viaduct segments launched from one of the portal piers.

21 January 2024 - Viaduct piers just south of the Gek Poh station. Crossheads remain to be cast
for several of the viaduct piers to the south.

15 January 2024 - Viaduct span construction underway above the junction of Jurong West
Streets 81 and 82 to close the gap.

15 January 2024 - Another view of viaduct construction at the junction of Jurong West Streets
81 & 82.

15 January 2024 - An aerial view of the completed viaduct spans as they cut through the former
Pioneer Primary School campus site.

15 January 2024

29 February 2024 - The southern-most portal pier of the contract in mid-Q1.

29 February 2024 - Works to cast the pier column for the the portal pier outside Westwood Primary
School underway.

29 February 2024 - A view of the portal pier with the initial viaduct segments launched.

29 February 2024 - Viaduct piers just south of the Gek Poh station.

29 February 2024

29 February 2024 - The viaduct spans have yet to be launched in the vicinity of the movement
expansion joint pier.

29 February 2024 - The completed viaduct span over the junction of Jurong West Streets 81 & 82.

29 February 2024 - An aerial view of the completed viaduct span along Jurong West Street 75 & 81.

29 February 2024 - An aerial view of the completed viaduct span as it crosses the former Pioneer
Primary School site.

29 February 2024 - Completed viaducts within the former Pioneer Primary School site.

29 February 2024

29 February 2024 - A view of the portal pier to the north of Tawas station under construction.

29 February 2024 - Another view of the portal pier north of Tawas station from Cleantech Park.

21 March 2024 - A view of the viaduct piers to the south of Gek Poh station. Supporting falsework
is visible ahead of crosshead construction for one of the viaduct piers.

21 March 2024 - A view of the southern-most portal pier with contract J105 piers visible beyond.

21 March 2024 - Casting for the pier columns of the portal pier outside Westwood Primary
School has since been completed.

21 March 2024 - A viaduct pier in front of the southern edge of Gek Poh station.

21 March 2024 - An aerial view of the completed viaduct spans in the former Pioneer Primary
School site.

19 March 2024 - Viaduct piers visible south of Tawas station for the special span crossing over
the PIE.

21 March 2024 - A single movement expansion joint along Jurong West Street 81.

21 March 2024 - Trestle installation at the former Pioneer Primary School site abutting the
movement expansion joint.

21 March 2024 - An aerial view of the trestle installation.

22 March 2024 - One last view of the portal pier just north of Tawas station in end-Q1.

Looking ahead into the second quarter, we expect that casting work for Tawas' station's central pier columns to be completed. Gek Poh station's installation of concourse slab arms should also be completed, with works moving onto the casting of the central row of pier columns as well. In addition, segment launching works should begin for the special crossing over the PIE too. Do stay tuned as we bring you continued updates on the progress of the JRL.

This post will be available on Instagram & Facebook on 25 April 2024.