A construction method of a circular underground continuous two-wall integrated structure

Abstract

The invention discloses a construction method for a round underground continuous wall two-in-one structure. The construction method includes the following steps that (1) bracket steel sheet piles are prefabricated, and round steel reinforced concrete enclosing purlins are prefabricated in a segmented mode; (2) pile sinking is carried out; (3) a foundation pit is excavated; (4) gaps in locking positions of the steel plate piles are blocked; (5) the round steel reinforced concrete enclosing purlins are assembled; (6) the foundation pit continues to be excavated downwards until the design depth is reached, and the gaps in the locking positions of the steel plate piles are continuously blocked through waterstop steel strips; (7) a bottom plate waterstop steel plate is welded to the inner side faces of the steel plate piles, and the bottom plate waterstop steel plate surrounds the inner side of a support in the circumferential direction in an endless shape; and (8) a cushion layer is laid, then a bottom plate is cast to reach a set thickness, and the bottom plate waterstop steel plate is made to stretch into the bottom plate. Through the construction method, the support cost for the foundation pit of an underground building can be reduced effectively; on the basis, the support is used as an outer wall of the underground building, the novel structure that the support and the outer wall are integrated is formed, and a foundation is laid for reducing the overall construction cost of the underground building.

Description

technical field [0001] The invention relates to a construction method of an underground part of a building, in particular to a construction method of a circular underground continuous two-wall integrated structure. Background technique [0002] With the continuous development of urban construction, the availability of land is becoming more and more scarce, while the number of cars is increasing, and the contradiction of urban parking has become very prominent. Solving the problem of parking has become an urgent problem in urban construction. The traditional method is to excavate multi-storey flat type ordinary garages underground. This method is simple in construction, but it is expensive and occupies a huge area, especially in old residential quarters, where the site conditions are not available at all. At present, a relatively novel method is to build a circular deep underground garage. This method occupies a small area and generally meets the requirements with a diameter ...

AI Technical Summary

Problems solved by technology

[0003] When constructing an underground structure similar to the above-mentioned circular deep underground garage, it is necessary to excavate a deep foundation pit and provide support for the foundation pit. For the water structure, multiple circular reinforced concrete purlins are poured inside, and the underground structure is constructed after the soil in the pit is excavated. This method is relatively mature, has good stability, and has little impact on the environment. The disadvantage is that the project cost is high and the construction period long

Or use steel sheet piles as the supporting structure. After the steel sheet piles are driven into the set position, the reinforced concrete purlins will be gradually constructed. Backfill the side wall after the structural construction reaches positive and negative zero, and remove the steel sheet pile. This method is convenient for construction. The steel sheet pile can also be used as a soil retaining structure and a water stop structure. The French reinforced concrete purlins and steel corbels need to be fabricated on site, and the steel sheet piles need to be removed after the construction is completed. The removal of the steel sheet piles will have a certain impact on the surrounding environment

The support cost of the foundation pit is high, the construction period is long, and the construction efficiency is low, so that the overall construction cost of this type of underground structure remains high

[0004] In addition, the construction cost of the underground building body is also high. The above factors have seriously restricted the development and promotion of this type of underground building including the circular deep underground garage; how to effectively reduce the support cost of the foundation pit and the cost of the underground building body Construction cost, and thus reduce the overall cost of this type of building, so that the development of this type of building, including circular deep underground garages, is a problem that requires the joint efforts of all parties to solve

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