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80 proposed areas to be drilled in MTR steel probe

Steel News - Published on Fri, 07 Dec 2018

Image Source: thestandard
The Standard reported that MTR Corp has proposed drilling open 80 sites at Hung Hom Station to check the safety of steel bars, which would take at least 16 weeks. The rail operator's managing director, Jacob Kam Chak-pui, said it is too early to say whether the tests will delay the launch of the Sha Tin to Central Rail Link, but the government has asked MTRCL to consider a part launch of the link. The steel bar controversy at Hung Hom Station broke out in May when media reported that couplers embedded in the diaphragm walls of platform slabs were cut short.

It is not known how many couplers are problematic - only several dozens according to some sources, thousands according to others. The MTRCL has come up with a plan to verify the safety of platforms at the station. It submitted the proposal to the Highways Department on Tuesday after an earlier proposal in October was rejected. The October plan proposed merely opening up the East-West Line slabs. But the government found that insufficient. The new proposal, accepted by the government, suggested a three-stage study.

The first stage will be a desktop exercise on verifying records, while the second stage will involve physical examination, including opening up slabs to check the couplers inside. After that the MTR would conduct structural assessment based on verification findings in the previous stages, and would design remedial works if required.

Kam said there were two reasons to open up walls: to ensure that couplers were installed in accordance with the latest design drawings, and to inspect the workmanship of the steel bar-couplers. For the first purpose, 24 locations on the East West Line platform would be opened up. For the second purpose, 28 locations on the East West Line slab would be opened, with another 28 on the North South Line slab. A minimum of 168 steel bars/coupler connections would be examined.

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Posted By : Ratan Singh on Fri, 07 Dec 2018
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