A triangular purlin used in the internal support system of foundation pit support

Abstract

The invention discloses triangular surrounding purlin for a foundation pit retaining and protecting inner support system. The triangular surrounding purlin is characterized in that a bottom side component, a first right-angle side component and a second right-angle side component form an isosceles right triangle structure in a surrounding manner and are fixedly welded with one another; a plurality of connecting holes A are formed in two side wing panels of H-shaped steel A in the bottom side component, rectangular flange plates are fixedly welded at two ends of the H-shaped steel A, and flange reinforcement strut angles are arranged in two side grooves of the H-shaped steel A; a plurality of connecting holes B are formed in outer side wing panels of H-shaped steel B in the first right-angle side component, a plurality of reinforcement plates and a lifting lug plate are arranged in two side grooves of the H-shaped steel B, and a rectangular seal plate is fixedly welded at one end of the H-shaped steel B; a lifting lug plate C is arranged in two side grooves of H-shaped steel C in the second right-angle side component. The triangular surrounding purlin has the advantage that the triangular surrounding purlin is mainly used for a purlin surrounding position of the inner support system, is applicable to being switched with a diagonal bracing, is convenient to assemble and disassemble and can be reused, so that purposes of saving the construction cost and facilitating construction are achieved.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a triangular purlin used for the internal support system of foundation pit support. Background technique [0002] In soft soil deep foundation pit engineering, reinforced concrete or steel pipe supports the support structure. In order to reduce the deformation of the foundation pit and increase the stability, the commonly used methods are: increase the size of the reinforced concrete purlin street surface, increase the number of steel pipe supports, Reduce spacing etc. But this will greatly increase the consumption of building materials and also reduce the effective construction space in the foundation pit. Since the steel support structure currently used mainly uses a single section steel or steel pipe as a support beam, there is no effective connection between each section steel or steel pipe, and it cannot work as a composite structure, so their support stiffness is...

AI Technical Summary

Problems solved by technology

Since the steel support structure currently used mainly uses a single section steel or steel pipe as a support beam, there is no effective connection between each section steel or steel pipe, and it cannot work as a composite structure, so their support stiffness is relatively low. The force it can withstand is relatively limited. For foundation pits with large spans, it is difficult to control their deformation with the current steel support support

Because many of these supports are made according to the requirements of on-site construction, there is no standardized connection size, and the purpose of interchangeability and universal use between various parts cannot be achieved. After the foundation pit construction is completed, most of the support parts have become disposable consumables. , cannot be reused

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