Forged steel node building-steel-structure connecting method

Abstract

The invention discloses a forged steel node building-steel-structure connecting method. The method is characterized in that a lower connecting plate is in butt joint with a left upper connecting plate and a right upper connecting plate in a small-angle oblique crossing node connecting mode through a Y-shaped forged steel node component, the forged steel node component is of a symmetrical or eccentric Y-shaped structure, and the forky folded angle of a node of the forged steel node component adopts a circular arc with the radius being 50 mm for transition; and butt joint adopts gas metal arc welding. According to the forged steel node building-steel-structure connecting method, compared with the prior art, welding is convenient, the operating space is wide, the welding quality is easy to ensure, welding deformation and rectifying are avoided, overlapping of node residual stress is well relieved, the difficult problems of connecting and welding of thick-steel-plate small-angle oblique connecting in a building steel structure are effectively solved, and thus a thick-steel-plate small-angle oblique-connecting node can be widely applied to the building steel structure.

Description

technical field [0001] The invention relates to the technical field of building steel structures, in particular to a building steel structure connection method for forged steel joints of thick steel plates skewed at small angles. Background technique [0002] In the building steel structure, according to the requirements of the building and the main structure, two or more thick steel plates need to be welded and connected at a small angle. At present, for the connection of steel structure nodes, direct welding or welding of cast steel node members are generally used. Although direct welding is simple and convenient, when two or more steel plates are directly welded and connected, due to the small angle between the two steel plates, there is no way to clean the back of the weld or add a welding backing plate, resulting in The quality cannot be guaranteed, and it is easy to repair the weld seam, which is labor-intensive and time-consuming. At the same time, because the weldin...

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Problems solved by technology

Although direct welding is simple and convenient, when two or more steel plates are directly welded and connected, due to the small angle between the two steel plates, there is no way to clean the back of the weld or add a welding backing plate, resulting in The quality cannot be guaranteed, and it is easy to repair the weld seam, which is labor-intensive and time-consuming. At the same time, because the welding of the thick plate can only be performed on one side, the heat input of the weld seam is asymmetrical, and the corner deformation of the steel plate caused by welding is relatively large, that is, two steel plates The angle between them is changed due to welding heat, it is difficult to correct to the angle required before welding or design

Welding of cast steel joint members, although the connection angle of each steel plate can meet the design, but the existing problems are: the internal quality of steel castings is relatively poor, and defects such as internal looseness or slag inclusion are prone to occur, and it is difficult for welded steel castings to achieve The design strength of the base metal, and the welding process requirements of steel castings are relatively high, especially for the production requirements of welding grooves, preheating and welding processes.

[0003] The small-angle mitred joints of thick steel plates in the prior art have welding deformation that is difficult to correct, and the superposition effect of the residual stress of the joints on the joints is large, which increases the stress peak value of the joints

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