CR106 - Completion of WB tunnel

We have just learnt that tunneling works for contract CR106, responsible for the construction of Loyang station and connecting tunnels to Pasir Ris East station, have been completed. The westbound (WB) tunnel boring machine (TBM) successfully docked with the Loyang station box earlier this month. This follows the earlier docking of the eastbound (EB) TBM in January this year. With the latest completion, approximately 16 of the 29 tunnel drives for phase 1 have now been completed.

CR117 - Completion of westbound tunnel

Graphical representation of tunneling progress for contract CR117. Based on compilation of
available information and may not be the most accurate nor up to date.

Contract CR117 has been one of the more elusive contracts to track progress of, mainly due to the different geology at the location which necessitated different construction methods. For instance, the earth retaining & stabilising structure (ERSS) employed at the site uses bore piles instead of diaphragm walls. Similarly, it has been a little difficult to track the progress of tunneling works. Nonetheless, we've managed to probe a bit more and finally have some idea of the progress when it comes to tunneling.

Undated image - A photo of the slurry tunnel boring machine used for the contract.
Source: Skymard / Hnjtx / China Construction Machinery Association

CR106 - Completion of eastbound tunnel

 

Another tunnel that has recently been completed along the Cross Island Line's (CRL) phase 1 section is the eastbound tunnel under contract CR106. This contract will be responsible for the construction of Loyang station and tunnels connecting to neighbouring Pasir Ris East station. Two tunnel boring machines (TBMs) are being used for the construction of the tunnels, with the launch shaft constructed under contract CR107, next to the Pasir Ris East station before being handed over to contract CR106.

CR109 - Completion of tunneling works

 

A collage of images from the recent eastbound tunnel breakthrough.
Source: CR109 Telegram group

It has been a rather quite time at SGMC since the end of the year due to the multitude of things going on in this author's personal life - lots of assignments for school while still holding down a full time job. Thankfully assignment season is over and we can celebrate a few milestones that we'd like to catch you up on. The first, and most recent one, being the completion of tunneling works for contract CR109.

CR111 - TBM Daphne

 

14 February 2025 - Group photo during the Geotechnical Society of Singapore's visit to contract
CR111's launch shaft with TBM Daphne visible behind.
Source: LinkedIn

Contract CR111 for the construction of Defu station and twin bored tunnels to Hougang station recently saw the launch of its first tunnel boring machine (TBM) last month. The TBM, named Daphne, will bore the westbound tunnel of the Cross Island Line (CRL), the mobile factory assembling tunnel segments along a route of approximately 1.5km.