Prefabricated box girder square steel pipe core die

Abstract

A prefabricated box girder square steel pipe mandrel, comprising a mandrel main body, a plurality of support frames and a plurality of retractable reinforced support skeletons, the mandrel main body is a hollow octagonal prism surrounded by a plurality of square steel pipes, the A plurality of support frames and a plurality of retractable reinforced support frames are arranged at intervals along the length direction of the mandrel main body in the hollow of the mandrel body, and the support frames and the retractable reinforced support frames are intersected, and the support frames include connecting The upper reinforcing bar, the right upward inclined reinforcing bar, the right reinforcing bar, the right downward inclined reinforcing bar, the lower reinforcing bar, the left downward inclined reinforcing bar, the left reinforcing bar and the left upward inclined reinforcing bar are sequentially connected from head to tail of the mechanism. The mandrel is easy to assemble, install and disassemble, which reduces labor intensity, saves labor, reduces construction costs, and saves construction time. The main body of the mandrel is intersected with a support frame and a retractable reinforced support frame, which improves the overall rigidity and strength of the mandrel. Strength, thereby greatly reducing the phenomenon of cracks and damage on the surface of the mandrel.

Description

technical field [0001] The invention relates to the technical field of bridge prefabricated molds, in particular to a prefabricated box girder square steel pipe mandrel. Background technique [0002] Box girder is a kind of beam in bridge engineering. It is hollow inside and has flanges on both sides of the upper part, which is similar to a box, hence the name. The box girder of reinforced concrete structure is divided into prefabricated box girder and cast-in-place box girder. Cast-in-place box girders are mostly used for large continuous bridges. The prefabricated box girder is processed in the factory and then transported to the site for installation. The factory prefabricated box girder combined with the bridge erecting machine can be erected after the completion of the lower part of the project, which can speed up the progress of the project and save the construction period. Therefore, for the bridges built during the construction of roads and railways, for the purpos...

AI Technical Summary

Problems solved by technology

[0007] The purpose of this invention is to provide a prefabricated box girder square steel pipe mandrel to solve the technical problems of existing mandrels such as difficulty in installation, disassembly and low overall rigidity and strength

Images