Construction method and supporting structure of multi-storey underground space under existing facilities

Abstract

The invention relates to a combined forward and reverse construction method of multi-layer underground spaces under existing facilities and a supporting structure, and belongs to the technical field of construction engineering. This construction method first constructs working wells, receiving wells and enclosure structures; secondly sets up a pipe curtain; then freezes and reinforces the soil in the underground space below the pipe curtain, and then constructs the permanent underground structure while excavating; and then Starting from the second underground layer to the N underground layer, the soil construction jet grouting piles are reinforced layer by layer, and the ground is excavated layer by layer to the bottom of the underground structure, and the underground structure floor construction is simultaneously carried out; finally, permanent construction is carried out layer by layer from bottom to top. structure. The support structure includes working wells and receiving wells symmetrically arranged at both ends of the soil mass in the proposed underground space, as well as an enclosure structure; a pipe curtain set above the soil mass in the proposed underground space, a permanent structure on the first underground floor and a second floor underground The jet grouting pile reinforcement system to the N layer underground, N is an integer greater than or equal to 2.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a forward and reverse construction method and support structure for a multi-layer underground space under existing facilities. Background technique [0002] In recent years, people pay more and more attention to the development and utilization of urban underground space. As the construction environment becomes more and more complex, the construction difficulty is also increasing. At present, in the construction of underground passages, urban subway stations, underground parking lots and other projects under existing facilities such as urban roads, railways, airports, and landscape green spaces, the open-cut method, reverse method, shield method, pipe jacking method and pipe-jacking method are generally used. Curtain method, etc. for construction. However, the open excavation method disturbs the surrounding environment greatly; the shield tunneling and pipe jacki...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method and supporting structure for multi-storey underground spaces under existing facilities, which are used to solve the problem of large-section, long-distance, and difficult construction of multi-storey underground spaces under existing facilities.

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