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The Kai Tak Hospital project has subsided and stopped. Cracks appear on the road outside the site. Engineer: Or contraction and thermal expansion due to cold

2021-10-15T10:45:21.713Z


The Hospital Authority announced a few days ago that the settlement of the new acute hospital in the Kai Tak Development Zone exceeded the standard during the typhoon, and the foundation works must be stopped immediately and work will resume after ensuring safety. The reporter visited the scene today (15th) and found that


The Hospital Authority announced a few days ago that the settlement of the new acute hospital in the Kai Tak Development Zone exceeded the standard during the typhoon, and the foundation works must be stopped immediately and work will resume after ensuring safety.

The reporter visited the site today (15th) and found several cracks in the footpath of Cheung Yip Street outside the construction site, which were connected to the location of the nearby Electrical and Mechanical Services Department and another cooling system project requiring road excavation.


Some civil engineers believe that the cracks are not necessarily caused by subsidence, or are more related to the impact of cold shrinkage and thermal expansion on the ground, and more long-term monitoring data is needed to determine; Gao Basheng, Chief Executive Officer of the Hospital Authority, responded to the incident this morning At that time, it was pointed out that the settlement of the Kai Tak Hospital site was mild and controllable. It was expected to be caused by wind and other weather factors. It was "a common phenomenon" and the construction would be restarted in due course, but safety was the first priority.


There were several cracks in the sidewalk of Cheung Yip Street outside the Kai Tak Hospital site. One of them could hold a dollar coin, which is equivalent to a width of 25 millimeters.

(Photo by Chen Shuxia)

The Kai Tak Hospital site is being enclosed for construction. As seen on the site, the footpath of Cheung Yip Street on the periphery of the site is undergoing another cooling pipe project, which requires excavation and laying of related pipes.

Several cracks appeared on the concrete pavement between the two projects. One of them can be placed with a dollar coin, which is equivalent to a crack with a width of about 25 millimeters. It is located near the red marking and blue paint.

The Kai Tak Hospital site has undergone subsidence and construction needs to be suspended. The buildings of the Children's Hospital nearby are also slightly affected.

(Data Picture/Photo by Liang Pengwei)

Senior civil engineer Ni Xueren said that it is believed to be more related to the ground contraction and thermal expansion.

He explained that expansion joints are generally reserved when laying concrete to prevent it from being affected by temperature changes.

However, according to the preliminary photos, the footpath is relatively rough, and it is speculated that there may be no expansion gaps, and it is caused by cold shrinkage and thermal expansion, and then cracks.

According to the cross grain of concrete, the cracks mainly follow the joint of concrete.

As for whether it will be related to the cooling pipe project, he pointed out that, generally speaking, the relevant project will have thermal insulation, and it is impossible to infer the relationship between the two.

Senior Civil Engineer Ni Xueren (information picture)

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He also stated that the cracks caused by the settlement are not necessarily visible to the naked eye, and depend on the direction of their movement.

If it is a large area of ​​settlement, the relevant characteristics may not be observed; if it is an irregular settlement, the cracks may appear uneven or uneven.

However, he emphasized that to accurately find out the cause of the cracks, one cannot conclude by photos alone. Long-term data and change monitoring are required, as well as judgments based on surrounding projects.

He also mentioned that the location of the red mark and blue paint is a settlement monitoring point, which is believed to have been set before the cracks occurred.

Gao Basheng pointed out that the settlement of the Kai Tak Hospital site is mild and controllable, and is expected to be caused by wind and other weather factors.

(Photo by Li Zetong)

In response to the incident this morning, Gao Basheng, Chief Executive of the Hospital Authority, said that the settlement problem on the Kai Tak Hospital site was minor and controllable. Relevant departments will review the situation in detail and restart the project at an appropriate time, but safety will be a major prerequisite.

As for the children's hospital near the site, he said that its operation will not be affected, but did not disclose the extent of the children's hospital settlement.

Regarding the delay in the announcement of the incident by the Hospital Authority, he said that he would review the situation and expected that it would not be announced quickly due to wind.

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Kai Tak Hospital Project Settlement Suspension Engineer: Stopped for at least 1.5 months to remedy errors or re-sink the foundation works of Kai Tak Hospital. 4 The monitoring point sinks more than 25 mm and will be announced after 5 days. The foundation works of the Road Fire Services Building caused the subsidence of the MTR tunnel. The train was still safe. The tunnel settlement of the MTR Kowloon Station to the Olympic Station exceeded the standard. The construction of the Duhua Road Fire Building Project was suspended. 7 months to resume work

01News

Source: hk1

All news articles on 2021-10-15

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