D-walling works at Lentor has commenced this quarter. Close to Yio Chu Kang road, the team is in the midst of constructing the sheet pile for the subway that will link to the station entrance at Calrose. Sheet piles are a favorable method of constructing an ERSS due to the time efficiency in installation and transportation. The interlocking steel segments are also earth tight and water resistant. This method is hence commonly used in shallow linkways and cofferdams.
We expect the completed section of sheet pile to be subsequently decked over by a second and more permanent traffic diversion at the junction of YCK/Ave 4/Lentor Drive next year. This is for the construction of the remaining section of subway beneath the existing diverted road, and subsequently the construction of the entrance at Calrose itself. This diversion would then probably last until the completion of the project.
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| Sheet piling for the subway leading to the station entrance at Calrose |
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| Panorama of 5XO |
At the 5XO site, Avenue 4 was diverted at the end of Q3 and with the site cleared, hoardings are going up along the west side where sheet piling works have commenced. D-walling works should commence from next month as well. To the east, silos and a desander plant have been assembled to support the impending D-wall construction.
Project notice for 5XO (transcript):
- Identified trees along AMK Avenue 4 have been fully removed to facilitate crossover tunnel box construction (5XO)
- Road diversion works at 5XO will be carried out in 2 stages. Traffic Diversion 1 completed on 29 September 2014.
- Traffic diversion 2 at the junction of Avenue 4/5 are planned to commence in early January 2015.
- Tubular pile, steel deck and RC drain has been constructed close to Block 643
- Sheet pile works at Blk 613,614,615 has commenced from mid Dec and will last for a duration of 3 months.
- Installation of monitoring instruments along the ground and buildings
- D-wall works along Blk 613/4/5 planned to commence from end November (delayed)
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| Driving along the diverted Letnor Drive (Oct 8) |
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| D-walling works in October |
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| D-walling works upfront - hoisting and insertion of rebar cage into the d-wall trench |
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| Driving along the diverted Letnor Drive (Oct 8) |
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| December 24 |
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| December 24 |
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| December 24 - Sheet Piling |
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| December 24 - Sheet Piling |
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| December 24 - Sheet Piling |
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| December 24 - Lentor Station |
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| Installation of hoarding at the face of the Lentor Green homes |
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| December 24 |
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| December 24 |
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| December 24 - North side/retrieval shaft |
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| December 24 - Rebar Cages along the length of the site |
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| December 24 - overview of Lentor station |
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| December 24 |
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| December 24 |
5XO
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| October 8 - Initial diversion of Avenue 4 |
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| October 8 - Initial diversion of Avenue 4 |
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| October 8 - Initial diversion of Avenue 4 |
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| October 8 - Initial diversion of Avenue 4 |
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| October 8 - Initial diversion of Avenue 4 |
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| October 8 - Initial diversion of Avenue 4 |
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| October 8 - Initial diversion of Avenue 4 |
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| December 24 - 5XO |
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| December 24 - 5XO |
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| December 24 - Street View of 5XO |
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| Layout of 5XO site |
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