Foundation pit composite enclosure structure crossing over existing underground structure and construction method of foundation pit composite enclosure structure

Abstract

The invention provides a foundation pit composite enclosure structure crossing over an existing underground structure and a construction method of the foundation pit composite enclosure structure. Thefoundation pit composite enclosure structure comprises conventional underground continuous walls buried in two opposite sides of the existing underground structure, a warped underground continuous wall and a freezing wall, wherein the warped underground continuous wall crosses over the existing underground structure and is connected between the two ends of the conventional underground continuouswalls on the two opposite sides of the existing underground structure, a notch is formed in the lower portion of the warped underground continuous wall, and the existing underground structure is arranged in the notch in a penetrating manner; and the freezing wall is used for sealing the notch, freezing pipes are laid on the outer side of the warped underground continuous wall, freezing media are arranged in the freezing pipes, and the freezing media wrap a soil body on the periphery of the freezing pipes through the freezing pipes so as to be solidified to form the freezing wall attached to the warped underground continuous wall. The problems that when a foundation pit engineering located in a water-rich stratum of a soft soil area crosses over an existing structure, a completely-closed enclosure structure cannot be formed by adopting a conventional construction method, and the soil retaining and water resisting effects cannot be achieved are solved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a foundation pit composite enclosure structure spanning existing underground structures and a construction method thereof. Background technique [0002] As the contradiction between the rapid expansion of urban space demand and the increasing tension of ground space resources becomes more and more prominent, the rational development of urban underground space resources is an inevitable trend of modernization development in countries and regions around the world. In recent years, underground projects such as urban rail transit, underground commercial complexes, express roads, and municipal pipe corridors have emerged continuously. The scale of underground space development has been unprecedentedly large, resulting in a large number of foundation pit projects. However, with the increase in the number of urban buildings (structures) and the improvement of the rail tran...

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Problems solved by technology

[0003] In order to overcome the defects in the existing technology, a foundation pit composite enclosure structure and its construction method are provided to solve the problem of the foundation pit engineering located in the water-rich strata in the soft soil area. For structures, without affecting the existing structures, the use of conventional construction methods cannot form a completely enclosed enclosure structure, and cannot ensure that it can truly play the role of retaining soil and water, thus causing engineering safety accidents

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