14 March 2024 - An aerial view of the contract CR112 worksite for Hougang station as at end-Q1.
Contract CR112 was one of the first civil contracts awarded for the Cross Island Line's (CRL) phase 1. The work site for the station is at various stages across different sites at the station box and exits. Exciting progress made over the past quarter has seen the commencement of excavation works at the main station box site and the waterproofing of parts of the subway connecting station exit 6. More pictures and information after the jump.
Station box north site & launch shafts The station box site is divided into 2 sections by Hougang Central, which bisects the station box. At the northern end lies the contract's launch shafts which will be used to lower two tunnel boring machines for their drives towards Serangoon North station. Excavation for the launch shafts had commenced in 2023 and has been ongoing through the past quarter. A gantry crane delivered to the site in late 2023 has since been installed. Works over the quarter have seen the launch shafts continue to be prepared ahead of the commencement of tunneling work.
Also within the northern section of the station box site, casting for the top level of the station cooling tower building has been completed. Part of the main station box has also commenced excavation works with excavators staying dormant during a visit at the end of the quarter.
6 January 2024 - An aerial view of the Hougang station site at night in early-Q1 2024.
15 January 2024 - An aerial view of the launch shaft at Hougang station in early-Q1.
12 February 2024 - An aerial view of the Hougang station site in mid-Q1. Rebar installation works for the top level of the cooling tower building can be seen in the middle of the picture.
14 March 2024 - An aerial view of the Hougang station site in end-Q1. The top level of the cooling tower building has since been cast. Excavators lay dormant at the main station box.
14 March 2024 - An aerial view of the launch shaft, with supports for the gantry crane tracks being set up as at end-Q1.
Station box south site The second half of the station box has also been a busy site with diaphragm wall works continuing over the quarter. King posts were also installed through the period - these will be used to support the slabs as the soil is excavated from the main station box progressively. Initial excavation has also begun at the area where the paid transfer linkway will be located.
15 January 2024 - An aerial view of the southern site of the station box as at early-Q1. King post installation is progressing, along with diaphragm walling works.
25 February 2024 - An aerial view of the southern site of the station box as at mid-Q1. Rebar cages for the diaphragm walls on site and king posts for installation can be seen.
14 March 2024 - An aerial view of the southern site of the station box as at end-Q1. Rebar cages continue to be installed as diaphragm wall construction continues.
14 March 2024 - A close up view of initial excavation at the paid transfer linkway.
14 March 2024 - A close up view of initial excavation at the paid transfer linkway.
The site utilises a clamshell grabber to facilitate diaphragm wall excavation instead of a hydrofraise machine. One of the advantages of using a clamshell grabber is that it does not have a large frame that is typical of a hydrofraise machine, allowing easier maneuverability in a tight work site. However, this machine can generate noise, especially when force is required to chisel through hard soil. Nonetheless, inflatable sound barrier balloons are used on site to mitigate the noise generated during periods of excavation.
15 January 2024 - An aerial view of the Exit 5 worksite as at early-Q1. 12 metre high noise barriers were being installed before the ERSS works commenced.
12 February 2024 - Machinery on site in mid-Q1. The clamshell grabber machine can be seen along with a crawler crane.
25 February 2024 - An aerial view of the station exit work site in mid-Q1. The guide wall can be seen just behind the bus stop shelter.
25 February 2024 - An aerial view of the covered linkway from the bus stop to the HDB block in mid-Q1.
14 March 2024 - An aerial view of the station exit work site in end-Q1.
Exit 6 worksite
Exit 6 is located the furthest away from the main station box, near the junction with Hougang Avenue 4. This station exit, one of 3 new exits being built for the CRL station, is at the most advanced stage of construction. The trench for the exit has been dug out and the roof slab cast. Over the past quarter, works have continued to progress, with a waterproof membrane installed over the completed section of roof slab. Additional retaining walls have been constructed over parts of the roof slab and it is likely that soil will be backfilled over the portions where the waterproof membrane has been installed.
15 January 2024 - An aerial view of the station exit work site in early-Q1.
15 January 2024 - A close up view of the station exit ERSS in early-Q1.
12 February 2024 - An aerial view of the station exit worksite in mid-Q1.
25 February 2024 - An aerial view of the station exit worksite in mid-Q1.
25 February 2024 - A close up view of the station exit ERSS in mid-Q1.
14 March 2024 - An aerial view of the station exit work site in end-Q1. A layer of waterproofing membrane has been installed over the roof slab.
14 March 2024 - A close up view of the waterproofing membrane installed over the subway roof slab.
Work at contract CR112 has made steady progress through the first quarter of 2024. Despite that, and the contract being one of the first awarded, there still appears to be no sign of the tunnel boring machines on site or at the staging site adjacent to the exit 6 work site. Nonetheless, we look forward to the continued progress on site and will be sure to keep you updated as things progress along. Do stay tuned for our future updates coming your way.
This post will also be available on Instagram & Facebook on 20 April 2024.
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