Multiple lower chord type large-span beam string structure for foundation pit

Abstract

The invention relates to a multiple lower chord type large-span beam string structure for a foundation pit, which is arranged between two truss steel supports, the truss steel supports are horizontally arranged in the foundation pit, and the beam string structure comprises a beam string upper chord, a main beam string assembly and an auxiliary beam string assembly. The characteristic that the string beam is an open web beam is utilized, a conventional string beam single lower chord structure is replaced with a multi-stage lower chord structure, the section height of the lower chord of the string beam and the number of supporting rods are reduced, meanwhile, stress of the string beam is more balanced, the rigidity and the stress capacity of the structure are enhanced, and the use span of the foundation pit steel supporting string beam is expanded.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a multiple lower-chord type long-span tension string beam structure used in foundation pits. Background technique [0002] In order to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, it is necessary to adopt support, reinforcement and protection measures for the side wall of the foundation pit and the surrounding environment. Whether it is a deep foundation pit project for a high-rise building or a subway construction, because most of it is excavated in a city, there are usually various structures such as traffic arteries, built buildings, or pipelines around the foundation pit. Safety, time saving, and cost saving, the steel structure truss internal support system is widely used. [0003] In the prior art, the steel structure truss support system is used in combination with the string beam support ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the steel structure truss support system is used in combination with the string beam support system, and the lower string structure of a single string beam is used, which has the following disadvantages: 1) The size of the lower string tie rods of the string beam and the upper string section of the string beam are limited, resulting in weak force capacity of the long-span string beam, which is not It is suitable for super large and deep foundation pits; 2) There are too many struts for long-span string beams, which leads to slow construction progress

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