Undermining method for three-dimensional pipe-curtain

Abstract

The invention discloses a three-dimensional pipe-curtain subsurface excavation method. The steps of the method are as follows: A. a vertical working well is formed at the circumference of an underground structure; B. a horizontal working channel is formed on the outer surface of the underground structure; C. a pipe roofing support is formed at the outer surface and a pipe roofing curtain is constructed inside the horizontal working channel; D. grouting and reinforcement are carried out by using pipe roofing steel pipes, and the grouting is carried out by pipe roofing to form a curtain after the pipe roofing construction inside the horizontal working channel is finished; E. digging is started; when the pipe roofing grouting curtain reaches the strength, the digging construction of soil massinside the three-dimensional curtain is carried out; afterwards, the construction of the underground structure is carried out. The method is simple and convenient, and safe and convenient in construction. Particularly, for a large span underground structure under a crossroad, the method only digs half of one side of a certain road, thus the method can ensure that the road is unblocked in the construction process. Accordingly, the method can be widely applied to projects with roads and other buildings, etc., such as subway stations of a city, road tunnels with large span, underground parking areas with large span and down-traversing tunnels under main roads of the city.

Description

technical field [0001] The invention relates to a three-dimensional pipe curtain underground excavation method, which is suitable for the construction of shallow-buried large-span underground structures. Background technique [0002] With the acceleration of China's urbanization process, more and more large-scale underground structures are built under urban roads, such as subway stations, urban underground roads, underground parking lots, etc. At present, the construction of urban subway stations, urban underground roads, underground parking lots and other projects under existing roads mainly includes open-cut method, under-cut method and trenchless pipe curtain method. The open cut method not only destroys the environment, but also excavates the original roads, which hinders the smooth flow of traffic and greatly interferes with urban production and life. When the geological conditions are poor and the burial depth is deep, if the underground excavation method is used for ...

AI Technical Summary

Problems solved by technology

When the geological conditions are poor and the burial depth is deep, if the underground excavation method is used for construction, the safety risk will be greater. Once a construction accident occurs, the social impact will be significant.

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