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.

CR105 - TBM Factory Acceptance Test

 

February 2023
Source: CREG

Recently the tunnel boring machine (TBM) for contract CR105 underwent its factory acceptance test (FAT). The FAT is where the client, in this case Taisei Corporation - China State Construction Engineering Corporation Joint Venture, goes to the manufacturing factory to see that the machine meets their expectations after production has completed. A series of tests are conducted to ensure that all is in order before the machine is disassembled for delivery to the client's project site.