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Written by: Zhang Jiamin
2020-01-29 00:00
Last updated: 2020-01-29 00:00The Kai Tak development plan promoted by the government involves more than 320 hectares of land, including the former Kai Tak Airport site, the adjacent Kowloon City and Wong Tai Sin. To connect Kai Tak Development Area and Choi Hung Estate, the Civil Engineering and Development Department is constructing a pedestrian tunnel connecting Kai Shing Road and Choi Hung Estate.
To enhance building efficiency, the agency first introduced rectangular tunnel boring machines for the project. According to the Civil Engineering and Development Department, compared with traditional manual excavation, the cost of the new technology has increased by about 30%, but it emphasizes that the engineering efficiency is doubled, and the risk of engineering staff can be effectively reduced. Months.
The Civil Engineering and Development Department introduced the first rectangular tunnel boring machine for the first time. (Photo by Luo Junhao)
To cope with the Kai Tak development, the Civil Engineering and Development Department will construct a 140-meter-long pedestrian subway that will connect major roads such as Cheng Kai Road and Choi Hung Estate, across Kwun Tong Bypass and Prince Edward Road East. As the tunnel is about 12 meters deep, the underground is full of sewage pipes, fresh water pipes, etc. Among them, a box-type storm drain closest to the drilling machine is only 1.5 meters away. In addition, the proposed tunnel is close to the main arterial road. When it is constructed, it must cross multiple viaduct structures and stalks to increase the difficulty of construction.
Rectangular drilling rig can avoid the impact of underground canals and reduce the impact
In the past, traditional manual pitless drilling or circular tunnel rigs were used for engineering in Hong Kong. However, traditional methods require workers to enter the tunnel to work, and the safety risk is high. As for the circular drilling rigs, the depth of drilling is relatively deep. The required fee is also high, and 30% of the space will not be used up. To cope with engineering challenges, the Civil Engineering and Development Department introduced the first rectangular tunnel boring machine for the first time. Its shallow drilling depth and full use of drilling space can help avoid underground canals; it is also equipped with a computerized control system It can monitor the operation of the main cutter head and 4 auxiliary cutter heads on the machine, and it can also display the advance speed, level and direction of the hydraulic system in real time to ensure normal operation.
The machine has a main cutter head and 4 auxiliary cutter heads. (Photo by Luo Junhao)
The tunnel requires a total of 92 prefabricated components
Engineers will first build concrete walls and tunnel guides at the entrance shaft of the site, then place the prefabricated components one by one into the tunnel, and advance the components forward with a hydraulic jack, so that the drill bit can be excavated. A total of 92 prefabricated components will be used to construct the tunnel, which will be manufactured on the site of Mu'an Street, Kai Tak.
The pedestrian subway requires a total of 92 prefabricated components. (Photo by Luo Junhao)
Jian Hancheng, Chief Engineer of the Civil Engineering and Development Department. (Photo by Luo Junhao)
Cost is about 30% more expensive than traditional methods
Chief Engineer of the Civil Engineering and Development Department Jian Hancheng said that the cost of constructing the tunnel is 900,000 yuan per meter, which is about 30% more than the traditional method. However, he emphasized that the new technology can double the engineering efficiency and improve the working environment of workers. They do not need to enter the tunnel for construction, they only need to work at the entrance. In addition, the new technology can reduce groundwater pressure, reduce the risk of soil erosion, and avoid causing settlement problems. However, he said that not every project can use new technology, depending on whether there is enough space to build shafts, whether soil is suitable, and so on. The drilling project will take 3 months, and the project will be started after the Lunar New Year. However, the remaining construction works will be required to complete.
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Development Bureau Kai Tak Development Area
