Forward-reverse combined construction method for foundation pit of non-permanent vertical support system

Abstract

The invention provides a forward-reverse combined construction method for a foundation pit of non-permanent vertical support system, and belongs to the technical field of foundation pit support designand construction, and provides a construction method which has the advantages of a reverse construction method and a forward construction method at the same time. According to the method, a beam plate with a permanent structure is adopted as a horizontal support, and a temporary vertical support member is adopted to bear a vertical force during foundation pit construction. And earthwork is excavated according to the floor from top to bottom, a structural beam plate is poured, a permanent vertical member is poured from bottom to top after bottom plate construction is finished, and finally temporary steel upright posts are disassembled from top to bottom to finish earthwork excavation and structural construction of the whole basement. Namely, when the permanent structural beam plate is adopted to replace a support in the foundation pit, the temporary vertical support member is adopted to bear the vertical force during the construction of the foundation pit, and the excavation of the foundation pit and the construction of the basement structure of the whole basement are achieved through reasonable construction sequence and reliable node connection.

Description

technical field [0001] The invention relates to the technical field of foundation pit support design and construction, in particular to a foundation pit construction method combining forward and reverse directions of a non-permanent vertical support system. Background technique [0002] The reverse method in the foundation pit engineering refers to the method of using the main basement beam and slab as the support in the foundation pit, excavating and constructing the basement from top to bottom according to the floor, because it has the advantages of high support rigidity, small environmental impact, saving construction period, and saving It has been applied in foundation pit engineering due to many advantages such as construction site. [0003] The vertical supporting member in the conventional upside-down method adopts "one column and one pile" that can also be used as a permanent structure, that is, supporting piles and columns are driven in the position of the structura...

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Problems solved by technology

[0004] However, in some areas where there is a shortage of equipment and professional labor, the implementation of the conventional inversion method is limited due to lack of conditions or insurmountable reasons. The verticality of columns and piles is difficult to ensure, which affects the quality of the structure. If the straight method is used instead, although the construction is relatively convenient, it cannot achieve the effect of small environmental impact of the reverse method, and the basement roof cannot be used as a construction site

[0005] In addition, for the foundation pit engineering of some reconstruction projects, the steel columns of the foundation pit have been driven in many years ago, and the permanent structural column network after the transformation does not coincide with the temporary steel columns, and the verticality of the steel columns that have been driven in cannot meet the requirements of conventional inversion. The high-precision requirement of "one column, one pile" has become an engineering and technical problem, how to use the reverse excavation method and utilize the existing steel columns

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