Concrete and metal structure combined type foundation pit supporting system

Abstract

The invention relates to a concrete and metal structure combined type foundation pit supporting system. The concrete and metal structure combined type foundation pit supporting system comprises a concrete beam, a truss supporting system and a combined beam string structure system; the concrete beam is arranged on the foundation pit inner wall; an end part pull rod of a beam string structure is pre-embedded into the concrete beam and is integrally and fixedly connected with the concrete beam; a web rod of the beam string structure acts on the concrete beam; and the truss supporting system actson the concrete beam. According to the concrete and metal structure combined type foundation pit supporting system, steel enclosing purlins in an existing system are canceled, a novel steel concrete combined type beam string structure system is formed through the direct combination of a steel pull rod and the concrete beam, the construction is convenient, and force is clear; concrete can be pouredintegrally, segmented splicing is not required, so that the problems that connection force transferring of a steel enclosing purlin system and a concrete crown beam or waist beam is not clear and thereliability is poor are solved, and potential safety hazards are removed; and due to the fact that the steel enclosing purlins are not arranged, the truss supporting system and the combined beam string structure system reach the effect of construction separation, and the construction convenience and flexibility are increased.

Description

technical field [0001] The invention relates to a concrete and metal structure combined foundation pit support system, which belongs to the technical field of building construction. Background technique [0002] In order to ensure the safety of the construction of the underground structure and the surrounding environment of the foundation pit, the support, reinforcement and protection measures are adopted for the side wall of the foundation pit and the surrounding environment. Whether it is a high-rise building or a deep foundation pit project for subway construction, since most of the excavation is carried out in the city, there are usually various structures such as traffic arteries, existing buildings or pipelines around the foundation pit, which involves the excavation of the foundation pit. A very important part of excavation is to protect the safe use of surrounding structures. [0003] In the prior art, the steel supporting structure of the foundation pit is mainly c...

AI Technical Summary

Problems solved by technology

[0005] 1. The quality of the concrete crown beam or waist beam at the construction site is difficult to guarantee, and the size error is obvious. The connection force transmission between the steel purlin system and the concrete crown beam or waist beam is not clear, the reliability is not good, and there are potential safety hazards; the steel purlin itself is Flexible connection, unable to provide the rigidity required for normal use of the system

[0006] 2. The support system lacks the convenience of assembly. Due to the heavy weight of single components, the construction process is limited. When the construction conditions of large foundation pits are complex and the lifting capacity is limited, the construction period will be affected, and the project will be shut down in severe cases.

[0007] 3. The lack of independence between the support system and the string beam support system leads to the inability to install and construct independently during the construction process, and the demolition also requires coordinated operations, which affects the construction period and reduces construction flexibility

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