J102 (Part 2) - Forest Hill & Tengah update Q2 2024

The future infill station and the approach tracks to Tengah station under contract J102 as seen
in end-Q2.

Last week we covered the first update for contract J102 over the second quarter of the year. This week, we're continuing our update with the remaining 2 stations under the contract - the future infill station just inside Tengah that we're calling Forest Hill and Tengah station, located at what will become the future town centre. As we learnt last week, a lot has happened within contract J102 over the past quarter. Works have been progressing at a frenzied pace, with viaducts within Tengah taking shape - more so than those within Choa Chu Kang. The station buildings are also substantially completed to the platform levels, although Forest Hill's structure is a very basic frame. In this update, we take a closer look at the goings-on around the two station locations.

JS2A - Forest Hill (provisional future station)
The future infill station has seen launch gantry Mulan make a re-appearance once again. Having completed work on the viaduct spans towards Tengah station, the gantry back-tracked towards Choa Chu Kang to resume viaduct segment launching eastwards.

20 April 2024 - A view of the infill station structure in the distance in early-Q2.

22 May 2024 - A view of the infill station structure as of mid-Q2.

24 June 2024 - A view of the infill station structure with gantry Mulan now visibly making its
way back towards Choa Chu Kang as of end-Q2.

To reach Choa Chu Kang from Tengah, the line crosses over Brickland Road through a special span crossing. Immediately after the road junction is a 3-cell box culvert that allows a canal to run beneath Choa Chu Kang Avenue 3. As a result, consultants avoided placing a viaduct pier at this location, necessitating an extended span over the junction instead. Segment launching works were carried out over the quarter, starting from the Tengah side first. Once launching works from the supporting pier on that end were completed, the equipment was relocated to the Choa Chu Kang side before works resumed.

20 April 2024 - A view of the lifting frames at the end of the launching segment on the Tengah
side of the road junction in early-Q2.

20 April 2024 - A close up view of the lifting frames at the end of the first run.

20 April 2024 - Remaining viaduct piers ahead of the infill station, within Tengah.

20 April 2024 - A view of the Choa Chu Kang side viaduct pier.

20 April 2024 - Ongoing launching works from the Tengah side. Supporting framework for the
crosshead casting of the Choa Chu Kang side pier was still in place.

20 April 2024

20 April 2024 - A view of the completed guideway section, hanging above the road junction.

20 April 2024 - A view of sections of completed viaduct spans as the line turns into the Forest
Hill infill station site.

20 April 2024

20 April 2024 - Sections of the future infill station visible.

20 April 2024 - A view of the Brickland Road special span crossing in early-Q2.

22 May 2024 - An aerial view of the viaduct section as it enters Tengah estate in mid-Q2.

22 May 2024 - A view of the Brickland Road special span crossing in mid-Q2.

22 May 2024 - A close up view of scaffolding being erected for launching of the last segment.

22 May 2024 - The remaining viaduct piers within the site.

24 June 2024 - A view of lifting frames, since relocated within the Choa Chu Kang site.

24 June 2024 - Launch gantry Mulan making a re-appearance at the site, having back-tracked from
Tengah station.

24 June 2024

24 June 2024 - A view of the segment launching works as seen from street level.

24 June 2024 - Works to connect the special span crossing with the subsequent viaduct pier were
completed. A trestle method is used to bridge the gap to the subsequent viaduct pier, which
happened to be a movement & expansion joint.

24 June 2024  - A view of the Brickland Road special span crossing in end-Q2.

24 June 2024 - The gap closes with each passing day.

24 June 2024  - A view of the Brickland Road special span crossing in end-Q2.

JS3 - Tengah
Tengah station is one of the most enigmatic elevated stations along the line, being hidden away from view by dense vegetation within the new town. Nonetheless, from what we have seen, launch gantry Gaia has been progressing towards the station at the upper track level. The gantry will eventually cross through the station and continue with works on the tail tracks for the eastern Jurong Region Line (JRL) route and eventually complete its work once the last few spans there have been completed.

13 April 2024 - A view of Tengah station's upper platform level just behind the support beams for
launch gantry Gaia in early-Q2.

23 May 2024 - A view of Tengah's upper platform level just behind the viaduct launch gantry
and cranes in mid-Q2.

24 June 2024 - A view of Tengah station, obscured by the tree canopy, from Garden Vines precinct
in end-Q2.

13 April 2024 - Launch gantry Gaia en route to Tengah station on the upper track level in
early-Q2.

Completed sections of viaduct in Tengah were also proceeding with parapet and cable rack installation works. These works involve the hoisting of precast sections of wall to be installed along the edge of the viaduct segments. They are eventually cast in place where the rebar from the precast segment meets the rebar of the viaduct segment edge. Cable racks are installed along the completed parapet walls to allow the laying of cables once rails are installed to facilitate signaling and other communication and power needs.

13 April 2024 - A view on ongoing parapet installation works along completed sections of viaduct.

13 April 2024 - Another slight glimpse of the parapet of the reception track at Tengah station's
upper platform level.

20 April 2024 - Parapet installation and slab casting works ongoing for the eastern route near
Tengah Junction in early-Q2.

20 April 2024 - Another view of ongoing works for the eastern route viaduct spans in early-Q2.
The connecting track between the upper and lower track levels can be seen at the junction.

20 April 2024 - A view of the completed viaduct from street level.

20 April 2024 - Where the tracks split at the Y-junction, seen from street level.

20 April 2024 - Scaffolding in place to support the casting of the slab between viaduct spans.

20 April 2024 - Some remaining sections to be filled in with segments.

20 April 2024 - A view southwards from Tengah Garden Walk of a completed section of viaduct
with parapet walls installed.

20 April 2024 - Another section of viaduct span to be completed.

22 May 2024 - Works continuing for parapet installation. Slab casting has since been completed.
Also in view are the outlines of slabs for the future tracks. You may be able to identify the location
of a crossover track based on the stubs present.

23 May 2024 - Completed sections of viaduct spans with parapet walls installed. A temporary
staging area (TSA) for trackworks will be set up near this section.

23 May 2024 - Completed sections of viaducts towards Tengah station at Tengah junction.
The yellow gantry cranes in the left midground are for the trackworks TSA.

23 May 2024 - A view of completed parapet  wall installation along sections of fully complete
viaduct spans.

23 June 2024 - Noise barrier installation was underway for the trackworks TSA site next to the
completed viaduct.

23 June 2024

23 June 2024 - Launch gantry Gaia barely visible now as it disappears behind the tree cover.

24 June 2024 - A view of the double decked viaduct section as the line approaches the hidden
Tengah station.

24 June 2024 - A close up view of launch gantry Gaia before it disappears.

24 June 2024 - The completed viaduct section near the junction of Tengah Garden Walk and
Plantation Crescent.

24 June 2024

24 June 2024 - Viaduct sections now significantly completed, will require beam leveling and
subsequent bonding works before parapet wall installation can proceed. The site in the background
is the casting yard for neighbouring contract J108.

24 June 2024 - Viaduct spans at the same location but with a slightly different view from street
level.

24 June 2024 - Completed viaduct spans along Plantation Crescent.

24 June 2024 - Some installed components can be seen, these brackets may be used for track
illumination during maintenance hours.

24 June 2024 - A view of the completed viaduct spans, looking towards Tengah junction. Parapet
walls are substantially completed.

24 June 2024 - An aerial view of the completed viaduct deck as of end-Q2.

Work within Tengah has progressed significantly, with stretches of viaduct now sporting parapet walls and cable racks installed. It is likely that the works were planned with these sections to be completed as early as possible to allow for handover to the trackworks contractor to begin laying of rails from the temporary staging area (TSA) near Hong Kah station. We look forward to the commencement of the next stage of works once the viaduct spans are completed further north towards Tengah station. With the progress seen thus far, the viaducts should be handed over to contract J150 by Q4 to begin rail installation works.

This post will be available on Instagram & Facebook on 31 July 2024.