Support replacing construction method in group pit project

Abstract

The invention provides a support replacing construction method in a group pit project. Cantilever beams are constructed from bottom to top in sequence to construct multi layers of structure beams in a second underground structure, and construction of each layer of structure beam comprises the steps that via holes at least larger than the size of the cantilever beams are drilled in the positions, corresponding to cantilever beams on the corresponding layer in a first underground structure, in a middle partition wall; in the second underground structure, a temporary supporting beam below the horizontal height of the via holes in the second underground structure is removed, a formwork allowing the structure beams to be constructed is arranged at the horizontal height position, corresponding to the cantilever beam on the lowermost layer, in the second underground structure, a structure beam steel frame is built in the formwork, and the structure beam steel frame is connected with reserved steel bars of the cantilever beam at the same height in the first underground structure; concrete is built in the structure beam steel frame to form the structure beams. A support replacing stress system is calculated, and a structure main beam support replacing construction method is used for guaranteeing the stability of an enclosure system.

Description

technical field [0001] The invention belongs to the technical field of engineering construction, and in particular relates to a support replacement construction method in group pit engineering. Background technique [0002] In my country, more and more projects are located near protected buildings (structures), such as shallow foundation buildings, protected buildings, important underground pipelines, subway station tunnels, etc. Such buildings (structures) are more sensitive to deformation. , the design usually divides the large foundation pit into several small foundation pits for partition construction. Due to the complex surrounding environment and high protection requirements, high requirements are placed on the deformation control of engineering construction. In addition to the environment during the foundation pit excavation In addition to protective measures, the process of removing and replacing braces during the restoration phase of the basement is also one of the im...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a support replacement construction method in group pit engineering, which is used to solve the problems of the prior art such as layer-by-layer construction that leads to delays in the construction period, and the method of support replacement that leads to weak structural stability assurance measures during the construction process, etc.

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