U rib plate unit assembling and welding method

Abstract

The embodiment of the invention discloses a U rib plate unit assembling and welding method. The method comprises the following steps of S1, fixing a base plate; S2, putting U ribs onto the base plate;S3, operating pressing and positioning mechanisms to the welding start ends of the U ribs to press and position the U ribs; and S4, putting a welding device inside or outside the U ribs to conduct welding at angle joints between the U ribs and the base plate from the welding start ends of the U ribs to the welding terminal ends of the U ribs, wherein in the welding process, the pressing and positioning mechanisms move to the welding terminal ends to complete assembling of the U ribs, moving and welding at the same time while maintaining pressing and positioning on the U ribs. Through the unitassembling and welding method provided by the invention, the assembly accuracy of the U ribs can be ensured; moreover, except positioning welding required during conventional assembling of the U ribs, the welding quality problem caused by positioned welding is eliminated, the welding quality is improved, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for assembling and welding a U-rib unit. Background technique [0002] The steel box girder is an important part of the load-bearing structure of the bridge. The steel box girder is generally an orthotropic steel bridge deck, which is mainly used to provide support and avoid bridge deformation. The steel box girder generally includes structures such as a top plate and a bottom plate, and the top plate and the bottom plate are generally welded by U ribs and the bottom plate. [0003] At present, orthotropic steel bridge decks are widely used in the manufacture of long-span bridges. Both the roof and the bottom plate of the bridge adopt this structure. The orthotropic steel bridge decks are welded by U ribs and the bottom plate. The manufacturing methods are as follows: First, several U-ribs with a length of about 12 meters (not limited) are assembled manually or mechani...

AI Technical Summary

Problems solved by technology

During the formal welding construction, the fixing method of segmented positioning welding is adopted. This fixing method is prone to deflection of the entire U rib, and the positioning accuracy is not high; at the same time, in order to fix the U rib, each side of each U rib, A small piece of tack weld is used for temporary connection every interval of 500-600mm. The length of tack weld is about 50mm, which has the characteristics of short length, small welding feet, large quantity, and low attention in manufacturing, which leads to the existence of tack weld. Many disadvantages: fast cooling, easy cracking, frequent arc start and stop, resulting in many arc crater pores, easy one-sided, poor fusion, easy slag inclusion in welds, etc.; , it will cause the weld reinforcement of the positioning weld to be too high, which will affect the quality and appearance of the weld

[0004] Therefore, this construction method has low work efficiency, many processes, high cost, poor quality, and a large number of quality hidden dangers.

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