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

Abstract

The invention relates to a top-down and bottom-up combined construction method and supporting structure of the multi-layer underground space below an existing facility, and belongs to the technical field of constructional engineering. The construction method includes the steps that firstly, a working well, a receiving well and an envelop are constructed; secondly, a pipe curtain is arranged; thirdly, a permanent structure of the first underground floor is constructed during excavation after a soil body of the space of the first underground floor below the pipe curtain is consolidated through freezing; fourthly, jet grouting piles are constructed on soil bodies layer by layer and reinforcement treatment is conducted from the second underground floor to the Nth underground floor; fifthly, excavation is performed downwards layer by layer and reaches the bottom of the underground structure, and construction of a bottom plate of the underground structure is performed at the same time; and sixthly, permanent structures are constructed layer by layer from bottom to top. The supporting structure comprises the working well and the receiving wheel symmetrically arranged at the two ends of a soil body of an underground space planned to be constructed, the envelop, the pipe curtain arranged above the soil body of the underground space planned to be constructed, the permanent structure of the first underground floor, and a jet grouting pile reinforcement system of the underground floors from the second underground floor to the Nth underground floor, wherein N is an integer larger 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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