A prefabricated underground structure under the condition of open excavation of foundation pit and its construction method

Abstract

The invention discloses a prefabricated subsurface structure under the foundation trench open cutting condition and a construction method for the prefabricated subsurface structure under the foundation trench open cutting condition, and relates to construction of subsurface structures in constructional engineering. The structure comprises a base plate cushion layer, a cast-in-place base plate, a superposed beam, a superposed plate, a superposed wall and a prefabricated center post; the superposed wall and the prefabricated center post are supported by the cast-in-place base plate and solidified with the cast-in-place base plate; and the superposed beam comprises a prefabricating part and a cast-in-place part. The construction method for the prefabricated subsurface structure under the foundation trench open cutting condition comprises the steps of (1) foundation trench open cutting, wall anchor support or wall anchor timbering are carried out; (2) the base plate cushion layer, a base plate coiled material waterproof piece and the cast-in-place base plate are constructed; (3) a tile molding bed is constructed; (4) mortar leveling is carried out on the outer side of the tile molding bed, and waterproof coiled materials are paved; (5) the superposed wall is lifted; (6) concrete cast-in-place is carried out between the superposed wall and the tile molding bed; (7) the prefabricated center post is lifted; (8) a prefabricated part of the superposed beam and a prefabricated part of the superposed plate are lifted; (9) cast-in-place is carried out on a superposed beam plate and column and wall node concrete; and (10) a top plate is wrapped with the waterproof materials, and top earthing back filling is carried out. The prefabricated subsurface structure has the beneficial effects of saving the working period and cost, the whole part is wrapped with the waterproof materials, the waterproof performance is guaranteed, and application and popularization are convenient.

Description

technical field [0001] The invention relates to the construction of an underground structure in a construction project, in particular to a prefabricated and assembled underground structure and a construction method thereof under the condition of open-cut foundation pit excavation. It mainly includes the construction technology of structural bottom plate, superimposed wall, roof plate, beam and column, and is suitable for the construction of main structures such as single-built underground parking lot and underground commercial street. Background technique [0002] With the rapid development of the economy and the continuous improvement of the level of urbanization, the development of underground space is also increasing. Underground garages, underground shopping malls, comprehensive underground pipe corridors, and underground roads have become the direction of vigorous development in China. Due to the limitation of waterproof requirements, the most commonly used main structu...

AI Technical Summary

Problems solved by technology

However, because the cast-in-place underground structure is manually poured on site, there are inevitably some defects and disadvantages: it takes time to tie the steel cage and set up the formwork.

The internal construction of the main structure requires the use of a large number of formwork and brackets, which will not only prolong the construction period but also cause waste of materials; the quality of pouring is not easy to guarantee

A large amount of cast-in-place concrete takes a long time, and the vibration may not be dense during pouring, which affects the quality of the structure; the flatness of the wall is also difficult to control

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