Enclosing purlin comprising square steel pipe and light concrete for supporting foundation pit

Abstract

The invention relates to an enclosing purlin comprising a square steel pipe and light concrete for supporting a foundation pit. The enclosing purlin comprises the square steel pipe, light concrete, an end plate and support ribs, and replaces the original steel enclosing purlin, so as to reduce the consumption of steel material and cost. No cavity is formed in the light concrete, so as to enlarge partial rigidity and effectively avoid partial deformation; the end plate is used for sealing and connecting the enclosing purlin, so as to ensure better integrity of the whole support structure of the foundation pit; and the support ribs are used for preventing excessive deformation of a flange plate and prolonging the service life of the light concrete. During construction, a triangular bracket (small bracket) is erected, then an external member of the enclosing purlin is mounted, and finally, a steel bracing strut is erected and is connected with the enclosing purlin through the flange plate so as to be prevented from falling down. The enclosing purlin has the advantages of convenience in connection, high economical efficiency, reutilization, guaranteed rigidity, and excellent application value.

Description

technical field [0001] The invention relates to a light-weight concrete purlin for square steel pipes used for the protection and support of subway foundation pits or large deep foundation pits. Background technique [0002] Steel support has been widely used in the support system of open-cut subway stations or interval deep foundation pits. It is an indispensable construction equipment in the subway construction process and a prerequisite element to ensure the safety of subway construction. Steel purlins are an important part of the steel support structure. In the surrounding support of subway foundation pits or large deep foundation pits, most of the existing steel purlins are non-integral, and the support of the entire foundation pit is a separate and loose system, which has potential safety hazards. In addition, most of the steel purlins in the prior art are spliced ​​by two parallel I-shaped steels through the end plates. The overall shape is rectangular, the cross-sec...

AI Technical Summary

Problems solved by technology

In the surrounding support of subway foundation pits or large deep foundation pits, most of the existing steel purlins are non-integral, and the support of the entire foundation pit is a separate and loose system, which has potential safety hazards

In addition, most of the steel purlins in the prior art are spliced ​​by two parallel I-shaped steels through the end plates. The overall shape is rectangular, the cross-section is I-shaped, and the vertical plate of the I-shaped is a closed cavity, which has insufficient local bearing capacity. Shortcomings

There are many inner and outer surfaces and welds of steel purlins, which are easy to rust and corrode, are not convenient for rust prevention and anti-corrosion treatment, are not conducive to long-term storage, and are difficult to reuse repeatedly

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