Manufacturing method of large steel box girder

Abstract

The invention relates to a manufacturing method of a large steel box girder. The manufacturing method comprises the following steps of: manufacturing a unit piece, assembling and pre-splicing girder sections, hoisting a steel box girder on a construction site, and performing welding, wherein the step of manufacturing the unit piece comprises: designing a drawing by using AUTOCAD software, performing modeling, determining a theoretical size, and determining welding and processing compensation amounts; and the step of manufacturability analysis comprises: A, welding manufacturability test, B, manufactured bridge actual measurement data and C, part machining requirements. Compared with the prior art, the manufacturing method disclosed by the invention has the advantages that a forward mounting method and a reverse mounting method are adopted, namely, bottom plate unit pieces are firstly assembled, then web unit pieces, diaphragm plate unit pieces, panel unit pieces and cantilever unit pieces are sequentially assembled, and the cantilever unit pieces adopt the reverse mounting method. The method has the advantage that most of weld joints are welded in a horizontal or climbing position. During welding, welding deformation is effectively controlled by utilizing the principles of constraint, self-constraint, strong constraint and flexible constraint, so that various geometric dimension deviations of all steel box girders are within a very small range.

Description

technical field [0001] The invention relates to the technical field of large steel box girders, in particular to a manufacturing method of large steel box girders. Background technique [0002] Steel box girder, also known as steel plate box girder, is a commonly used structural form of long-span bridges. It is generally used on bridges with large spans. It is called steel box girder because it looks like a box. In long-span cable-supported bridges, the steel box girder spans hundreds of meters to thousands of meters, and is generally divided into several girders. Its cross-section has wide and flat shape characteristics, and its aspect ratio reaches about 1:10. Steel box girders generally pass through the top plate, bottom plate, web plate, and transverse diaphragm, longitudinal diaphragm and stiffeners. Fully welded connection. The roof is an orthotropic bridge deck composed of a cover plate and longitudinal stiffeners. [0003] The large steel box girder is assembled a...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a manufacturing method of a large steel box girder to solve the problem that the large steel box girder proposed in the above background technology adopts a multi-stage assembly method for assembly and welding during the construction process, and the construction speed is faster during the assembly process. , but at the same time, the risk is higher, misplaced welding is prone to occur, and the risk of resumption of work is higher