Solving the difficult problem of Shield Subway Construction in Water-rich Sand and Pebble Stratum in China
Xinhua News Agency, Chengdu, November 23 (Reporter Qi Zhongxi) on the 23rd, the reporter learned from China Railway Construction Co., Ltd., that the Chengdu Metro Line 10 and Line 6 projects undertaken by the China Railway 18th Bureau Group. The difficult problem of long-distance subway shield construction in water-rich sand and gravel stratum has been solved successively, and the steel sleeve shield receiving technology has been adopted for the first time in domestic construction, which has accumulated important experience for subway construction in our country.
According to Xu Yangping, project manager of the 18th Bureau of China Railway, the second phase of Chengdu Metro Line 10 is 27 kilometers long and has a maximum operating speed of 100 kilometers per hour. The company is responsible for the construction of the section through the rich loose large pebble strata, the geological situation is very complex. In the fine sand grain, also wraps the hard pebble, the strength is uneven, the construction difficulty is rare.
After the shield machine was launched, the project department arranged for special personnel to inspect the ground, buildings and structures along the tunnel 24 hours a day, and at the same time increase the input of mechanical equipment personnel to carry out comprehensive "physical examination" maintenance of the equipment in advance in special areas. Ensures zero failure of the shield.
In addition, the civil construction project of Chengdu Metro Line 6 undertaken by the Group also adopts steel sleeve shield receiving technology for the first time in China. It is understood that this new technology is a device that can safely receive the shield machine and protect the steel sleeve. When the water-rich sand layer or the surrounding environment is complex, the main function is to ensure that the tunnel door is sealed and does not leak when the shield is received, and the pressure is set up in the soil silo. More effectively protect the steel sleeve to ensure the safety of shield reception.