Underground excavation construction method for multilayer underground space of soft soil area

Abstract

The invention discloses an underground excavation construction method for a multilayer underground space of a soft soil area. The method comprises the following steps: (1) forming a gantry pipe roof of an underground first-layer by the construction of horizontal static pressure steel pipes; (2) excavating the soil of the underground first-layer and pouring a top plate structure in different stages in the pipe roof, and forming an underground first-layer reinforced concrete cast-in-place structure which is enclosed by a top plate, side walls and a next-layer plate; (3) after the structure of the underground first-layer reaches the designed strength, constructing a plurality of layers of foundation pit support structures to be excavated in the underground first-layer; (4) continuously excavating downwards to a pit bottom; (5) performing layer-by-layer back construction, and completing the structure construction of the whole multilayer underground space. According to the method, the problem of poor carrying capacity of lateral steel pipes in a conventional pipe-roofing method when the excavation depth is large enough is solved, and the aim of constructing the multilayer underground space in the soft soil area under the limited excavation conditions is achieved.

Description

technical field [0001] The invention relates to the technical field of underground engineering construction, in particular to a construction method for underground excavation of multi-layer underground spaces in soft soil areas. Background technique [0002] Rational development of underground space is an important manifestation of scientific utilization of urban underground space resources, adapting to urban modernization and sustainable development. Due to the delay in planning and the limitation of construction methods, the underground resources in areas such as urban roads and landscape green spaces cannot be fully utilized, which objectively results in a waste of public resources. [0003] Restricted by geological conditions and construction techniques, most urban centers in soft soil areas at home and abroad adopt the open-cut method for the development of underground space. Restoration of damage. Therefore, trenchless technology has become an important idea of ​​und...

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies of the prior art, the present invention proposes a method to solve the problem of insufficient lateral steel pipe bearing capacity of the pipe curtain method when the excavation depth is relatively deep, and realizes the smooth construction of multi-layer steel pipes under limited excavation conditions in soft soil areas. The purpose of the invention of the underground space The underground excavation construction method of the multi-storey underground space in the soft soil area

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