Cross Island Line Construction: CRL - A snapshot in July 2024

Overview of CRL1 contracts CR102 - CR115 as of July 2024.
Top (L - R): CR102 - Tunnels at Changi East, CR4 - Pasir Ris East, CR5/CP1 - Pasir Ris
Middle (L - R): CR6 - Tampines North, CR110 – Large diameter tunnel, CR7 - Defu
Bottom (L - R): CR8 - Hougang, CR9 - Serangoon North, CR10 – Tavistock

Overview of CRL1 contracts CR116 & N109A, CPE contracts P102 - P103 & CRL2 contracts
CR205 - CR211 as at July 2024.
Top (L - R): CR11 - Ang Mo Kio, CR12 - Teck Ghee, CP2 - Elias
Middle (L - R): P103 Cripple siding, CR15 - King Albert Park, CR16 - Maju
Bottom (L - R): CR17 - Clementi, CR18 - West Coast, CR19 - Jurong Lake District

July was a momentous month for the Cross Island Line (CRL). All civil contracts for the construction of stations across phases 1, 2 and the Punggol extension were awarded. Along phase 1, several contracts were in the midst of Tunnel Boring Machine (TBM) assembly and subsequent launch as well. In this update, we take a brief look at the progress made across the line's first few phases.

Phase 1
Tunneling works are beginning for the construction of the first phase of the line. We understand that the majority of tunneling works are anticipated to be completed by about 2027, with most contracts beginning tunneling in 2024 and a handful in 2025. TBM assembly works can be seen taking place at various different contracts along the phase. Meanwhile, diaphragm wall works were progressing at various station along the route, with certain contracts reaching milestones of having these works completed for certain sections.

Tunnels between Aviation Park station & Changi East depot (Contract CR102)
In a nutshell: TBM assembly was being done at the launch shaft for the contract. At least two TBMs were noted within the shaft.

8 July 2024
Source: LinkedIn

CR3 - Loyang (Contract CR106)
In a nutshell: The launch shaft for the contract continued with excavation work, being constructed by neighbouring contract CR107 at Pasir Ris East station site. Soil investigation was also being carried out along the tunnel alignment. Tunneling work is expected to commence in 2025.

25 July 2024

CR4 - Pasir Ris East (Contract CR107)
In a nutshell: Diaphragm wall works continued for the main station box along with the perimeter of Exit 1. At the eastern end of the station, a section that was excavated for the construction of the connecting cooling tower had been back-filled.

25 July 2024

CR5 | CP1 - Pasir Ris (Contract CR108)
In a nutshell: At the western end of the station, works were focused on the installation of the traffic decking that will see the westbound carriageway of Pasir Ris Drive 1 shifted northwards to allow for construction works to begin on the southern side of the road for the tunnel diaphragm walls. Construction of the diaphragm walls continued in the main station box area as well as the cut & cover tunnels to the eastern end. Tunneling work by TBMs is expected to kick off in 2025.

25 July 2024

CR6 - Tampines North (Contract CR109)
In a nutshell: With the Tunnel Boring Machines (TBMs) being launched last month, the northern launch shaft near the Tampines Expressway (TPE) has been busy. The gantry crane was moving about a fair bit on the day of visit to the site, likely supplying tunnel segments to the machine for its initial drive. Over on the other end of the site, excavation works continued at the southern launch shaft and the cut & cover tunnel area, with struts being installed ahead of excavation work.

25 July 2024

Large diameter bored tunnels – Paya Lebar Air Base (Contract CR110)
In a nutshell: Heavy duty cranes were on site at the launch shaft on the eastern side of Paya Lebar Air Base, where the future facility building will be located. Parts of the large diameter TBM were likely to have been lowered into the launch shaft as the machine begins assembly ahead of its launch towards Defu station.

25 July 2024

24 May 2024
Source: Hunan Daily New Media

25 July 2024

Large diameter bored tunnels – intermediate shaft (Contract CR110)

Near the Kallang-Paya Lebar Expressway (KPE), diaphragm wall work had been ongoing for an intermediate shaft through which the TBM for the contract will bore through en route to Defu station. Diaphragm wall works though, had paused for a while to allow for the preparation of a road diversion over the completed sections of diaphragm wall. Road decking had been installed and paved over with the road diversion due ahead of works for the diaphragm wall resuming in Q3.

25 July 2024

CR7 - Defu (Contract CR111)
In a nutshell: Works continued on the diaphragm wall of the main station box with rebar cages observed on site. Additionally, preparatory works at the launch shaft continued on as well. There were no segments of gantry crane or other infrastructure noted near the launch shaft at this point.

25 July 2024

CR8 - Hougang (Contract CR112)
In a nutshell: Preparatory works were carried out for the diversion of Hougang Central (Major) in the direction of the Hougang Polyclinic, with the road diversion taking place over the last weekend of the month. The works included the backfilling over the sections of roof slab that were completed and paving of new roadways within the HDB precinct.

25 July 2024

CR9 - Serangoon North (Contract CR113)
In a nutshell: With diaphragm walling works completed at Exit 4, the focus has since shifted to other locations where the machinery is redeployed to complete similar works. At Exit 4, soil improvement works were ongoing ahead of excavation within the completed diaphragm walls.

25 July 2024

CR10 - Tavistock (Contract CR115)
In a nutshell: Diaphragm wall works continued along the southern edge of the station. Across the Central Expressway (CTE), preparation works were ongoing at the launch shaft for the lowering of the first TBM. It is likely that the TBM will be launched towards Ang Mo Kio station, judging from the completion levels of the acoustic noise barrier.

25 July 2024

CR11 - Ang Mo Kio (Contract CR116)
In a nutshell: Demobilisation of equipment on the southern side of the project was taking place in view of the completion of the diaphragm wall structures. Excavation works were underway at the Exit 10 site. In the coming months, road diversions may be expected as Ang Mo Kio Avenue 3 is shifted southwards to allow diaphragm wall works to begin on the northern edge. The TBM for the contract was also recently unveiled at the factory in China before being shipped over.

25 July 2024

16 July 2024
Source: LinkedIn

25 July 2024

Source: YouTube

CR12 – Teck Ghee (Contract N109A)
In a nutshell: The major development over July was the delivery of the Rectangular TBM components on site.

25 July 2024

Punggol Extension
Work on the Punggol Extension is gaining momentum with all four sites of the project well into works for the line. Diaphragm wall works have begun under all three contracts. Tunneling works along this phase of the line are anticipated to be completed by 2028.

CP2 – Elias (Contract P102)
In a nutshell: The site is fully cleared and the site offices have been completed. Diaphragm wall works were underway for the launch shaft where a single Earth Pressure Balance TBM will be launched through 2 drives for tunneling works towards Pasir Ris station.

25 July 2024

CPE Cripple siding near Pasir Ris camp (Contract P103)
In a nutshell: Components for TBM Elizabeth were staged on site although assembly of the TBM does not appear to be taking place just yet. Diaphragm wall works appear to be continuing on site at the cripple siding which will be used to launch the large diameter TBM for 2 drives.

25 July 2024

Phase 2
Works along phase 2 of the line continue to ramp up with the award of all civil contracts for the stations completed. Towards the end of the month, the contract for CR211 was finally awarded, leaving one final civil contract (CR207) for the construction of tunnels between Clementi and Maju stations to be awarded. Various works are taking place at the different station sites along the route, with the most obvious progress seen at Clementi.

CR15 – King Albert Park (Contract CR205)
In a nutshell: Works are still largely confined to soil testing, strengthening and investigative works, with test piles being built to verify the intended design. In the coming months, site clearing is expected along with the erection of hoarding around the site.

27 July 2024

CR16 – Maju (Contract CR206)
In a nutshell: Site clearing continues at the location of Corona Florist & Nursery, which is where the project's site office will be located. At the main station site, works continued for the advanced contract CR2016. It is anticipated that the advanced contract works should wrap up by December 2024.

27 July 2024

CR17 – Clementi (Contract CR208)
In a nutshell: Demolition of the former Clementi Neighbourhood Police Centre & Clementi Police Division Headquarters has made headway with the building almost completely obliterated. Works now appear to shift to the demolition of the building's basement. Also visible on site was the first auger machine, likely to facilitate the construction of a test pile to verify the intended design strength before major construction proceeds. The site office which will also house the phase's Project Information Centre had also made steady headway.

27 July 2024

CR18 – West Coast (Contract CR209)
In a nutshell: Demolition work continued at the site of the former Tanglin Secondary School with more of the buildings being wrapped with scaffolding and construction netting. Heavy machinery for the construction of the test pile was still on site as well.

27 July 2024

CR19 – Jurong Lake District (Contract CR211)
In a nutshell: The contract for the construction of the station and tunnels was finally awarded. Located at the site of the former Jurong Country Club, dense vegetation blocks most of the view of the future station's exact location.

18 July 2024

A similar but consolidated (a.k.a. simplified) post is also available on Instagram & Facebook.

Cross Island Line Construction

Saturday, August 3, 2024

CRL - A snapshot in July 2024

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