Combined foundation pit support beam string structure

Abstract

The invention relates to a combined foundation pit support beam string structure comprising a concrete beam, a support prestress device and a tensile device. A steel purlin is not arranged on the inner side of the concrete beam, and an end pull rod of the beam string structure is pre-buried and fixed in the concrete beam; the support prestress device directly or indirectly acts on the part, corresponding to the end pull rod, of the concrete beam; the support prestress device is not rigidly connected with the end pull rod; the tensile device comprises a metal piece pre-buried in the concrete beam in a foundation pit, and a prestress regulating device is connected with a prestress connecting piece; and the prestress connecting piece is connected with the part, extending out of the concrete beam, of the metal piece. According to the beam string structure, a truss support system and a beam string structure support system are separately independent, so that the truss support system and thebeam string structure support system are installed and constructed separately in the construction process, and further operated during removal separately; the construction period is shortened, and theconstruction flexibility is improved.

Description

technical field [0001] The invention relates to a foundation pit support system, in particular to a combined foundation pit support string beam, which belongs to the technical field of building construction. Background technique [0002] In order to ensure the safety of the underground structure construction 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 a subway, because it is excavated 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 content is to protect the safe use of its surrounding structures. [0003] In the existing technology, the lack of independence between the truss support system and the string ...

AI Technical Summary

Problems solved by technology

[0004] In addition, in the prior art, the steel support system of the foundation pit can only bear compression but not tension

For deep foundation pits, there is silt in the soil outside the pit, or the excavation is unbalanced on both sides of the external corner support of the foundation pit, and in the case of multiple supports, the enclosure structure may appear under different working conditions such as excavation and support replacement. The external expansion will lead to the detachment of the enclosure structure from the support, which is inconsistent with the calculation force assumption, and it is difficult to deal with the uncertainty of foundation pit excavation, which may cause foundation pit safety problems

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