A method for the integration of prefabricated main structure and support structure in open-cut engineering

Abstract

The invention discloses an engineering prefabricated main structure and supporting structure integration method based on an open cut method. The method comprises the following steps: required prefabricated plates are prefabricated; a foundation pit enclosure structure with hoisting system guide rails embedded is implemented; top beams are cast at the top end of the enclosure structure, and a hoisting system is erected on the top beams; foundation pit earth is excavated, and prefabricated slabs of a bottom plate, prefabricated slabs of intermediate plates and prefabricated slabs of a top plateare positioned sequentially to force required positions of a foundation pit in a grouped manner by the hoisting system according to vertical cutting depth and longitudinal cutting length in real timeuntil the plates reach designed elevation; the grouped prefabricated slabs of the bottom plate, prefabricated slabs of the intermediate plates and prefabricated slabs of the top plate are spliced in regular sequence respectively until splicing for each plate is finished; slide wall components and columnar components are mounted in a grouped manner between adjacent prefabricated slabs, related facilities are dismounted, and earthing backfill is performed. Overall support stiffness of the foundation pit is improved by the layered prefabricated slabs, deformation of the foundation pit is limitedto the greatest extent, anchor ropes and supports are reduced, and force transformation is reduced.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to the field of underground structure engineering, and in particular to a method for integrating the prefabricated main structure and supporting structure of an open-cut engineering project. Background technique [0002] The open cut method refers to the construction of underground structures, which are excavated in layers and sections from the ground until the size and elevation required by the structure are reached, and then the main structure construction and waterproofing work are carried out in the foundation pit, and finally backfilling and restoration ground. [0003] The key processes of the open cut method are: lowering the groundwater level, slope support, earthwork excavation, structural construction and waterproofing. Among them, slope support is the key technology to ensure safe construction. At present, the commonly used support forms according to the...

AI Technical Summary

Problems solved by technology

[0018] Due to the existing technology, it is necessary to carry out the construction of the supporting structure first, then excavate the foundation pit, and then erect supports or lay soil nails or anchor cables for support to ensure the stability of the foundation pit, and finally layer the cast-in-place underground structure Construction of the waterproof layer, etc., due to the many procedures, often need to replace the support, reserve construction joints in sections, etc., the construction quality is difficult to guarantee, and there are often problems such as concrete pouring that does not meet the durability requirements and serious water leakage, not only the project investment is large , there is a lot of dust, mud, etc. during on-site construction, which has a great impact on the environment

At the same time, the existing prefabricated stations also need to excavate the foundation pit first, then install the anchor cables, and finally assemble the station. Since many times the central urban area of ​​the city does not have the conditions for applying the anchor cables, the application range is greatly restricted. limit

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