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Steel box girder manufacturing and welding process

A welding process and technology of steel box girders, which are applied in bridges, bridge materials, bridge construction, etc., can solve the problems of large influence on geometric accuracy, large number of steel box girder segments, and large number of penetration welds, etc., to achieve convenient Tailored welding, guaranteed welding quality, and improved service life

Pending Publication Date: 2021-03-09
THE 5TH ENG CO LTD OF CHINA RAILWAY 25TH BUREAU GRP +1
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Problems solved by technology

[0004] At present, when this kind of box girder is welded as a whole, the number of steel box girder segments is large, the structure is complex, the welding positioning is complicated, the welds are dense, the number of penetration welds is large, the welding quality is high, and the welding deformation affects the geometric accuracy. Greater impact

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  • Steel box girder manufacturing and welding process

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Embodiment Construction

[0086] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0087] refer to figure 2 , is the manufacturing welding process of a kind of steel box girder disclosed by the present invention, comprises the following steps:

[0088] Step 1. Raw material pretreatment:

[0089] 1. Before the steel plate is unloaded, the surface quality of the steel plate is checked and the surface dirt is removed, and then the nine-roller and eleven-roller leveling machines are used to level the steel plate according to different plate thicknesses to ensure the flatness of the steel plate and eliminate the internal defects of steel plate rolling. stress;

[0090] 2. Steel plates and various profiles are shot blasted and sprayed with workshop primer on the steel pretreatment line. The workshop primer is sprayed once, and the thickness of the paint film is 25 μm.

[0091] Step 2, raw material cutting:

[0092] 1. The rolling direction o...

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Abstract

The invention relates to a steel box girder manufacturing and welding process. The steel box girder manufacturing and welding process comprises the following steps that step 1, raw materials are pretreated; step 2, raw material blanking is carried out; step 3, steel box girder sections are manufactured; step 4, main beams are spliced; step 5, the main beams are welded; step 6, the main beams are corrected; and step 7, the steel box girder is assembled and welded on a construction site. The steel box girder manufacturing and welding process has the effects that welding deformation can be reduced, the part stress state is improved, and the box girder quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of steel structure bridges, in particular to a manufacturing process of a steel box girder. Background technique [0002] Steel box girder, also known as steel plate box girder, is a commonly used structural form of long-span bridges. 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, steel box girders with a span of several hundred meters or even thousands of meters are generally divided into several beam sections for manufacture and installation. The cross-section has wide and flat shape characteristics, and the aspect ratio reaches 1: 10 or so. Steel box girders are generally connected by all-welding of the top plate, bottom plate, web plate, and transverse diaphragm, longitudinal diaphragm and stiffeners. The roof is an orthotropic bridge deck composed of a cover plate and longitudinal stiffeners. [0003] Exist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00E01D2/04
CPCB23P15/00E01D2/04E01D2101/30
Inventor 朱连臣王有旗刘普前谢彬张志华刘承启宋昱宇
Owner THE 5TH ENG CO LTD OF CHINA RAILWAY 25TH BUREAU GRP
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