Method for prefabricating camber of large-scale steel laminated beam web

Abstract

The invention provides a method for prefabricating the camber of a large-scale steel laminated beam web. The method comprises the steps that firstly, one side, arranged at the side of an upper beam flange plate, of an upper beam web body and one side, arranged at the side of a lower beam flange plate, of a lower beam web body are blanked according to an ideal curve for prefabricating the camber, and one side, arranged at the side of an upper beam laminated plate, of the upper beam web body and one side, arranged at the side of a lower beam laminated plate, of the lower beam web body are blanked according to a straight line; strip heating is carried out on the side, arranged at the side of the upper beam flange plate, of the upper beam web body and the side, arranged at the side of the lower beam flange plate, of the lower beam web body, and due to thermal stress, the upper beam web body and the lower beam web body generate compression plastic deformation, and then the side, arranged at the side of the upper beam laminated plate, of the upper beam web body and the side, arranged at the side of the lower beam laminated plate, of the lower beam web body form the camber of the approximately ideal curve; and finally a full-automatic vibration aging way is utilized for performing the vibratory residual stress relief onthe upper beam web body and the lower beam web body, and stability of the camber size is ensured. According to the method, flatness of the laminated beam laminated plates is effectively ensured, and the method can be widely applied to the technology for prefabricating the camber of the large-scale steel structure laminated beam web of a supercritical or ultra-supercritical thermal generator set.

Description

technical field [0001] The invention belongs to the technical field of manufacturing large-scale steel stacked beams, and in particular relates to a method for prefabricating the web camber of large-scale steel stacked beams. Background technique [0002] In the boiler steel structure of supercritical and ultra-supercritical thermal power generating units, the stacked beam is an important component to bear the dynamic load of the boiler, which is formed by superimposing and connecting the upper and lower beams. In the manufacture of stacked beams, web prefabricated camber is a key technology, which directly affects the manufacturing quality and installation performance of stacked beams. At present, in the manufacturing process of large-scale and super-large stacked beams, due to the huge structure, it is impossible to use CNC cutting technology or profiling cutting technology to prefabricate the camber. Instead, use a semi-automatic cutting machine to cut and blank the foldi...

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Problems solved by technology

At present, in the manufacturing process of large and super-large stacked beams, due to the huge structure, it is impossible to use CNC cutting technology or profiling cutting technology to prefabricate the camber. Instead, use a semi-automatic cutting machine to cut and blank the folding line at one time to complete the web The prefabrication of the camber will cause the edge of the side web of the laminated slab to be not smooth and irregular after the prefabricated camber, and the correction amount will be large, and it cannot be corrected after being out of tolerance. It is difficult to effectively ensure the flatness of the laminated slab, thus affecting the overall quality of the stacked beam , so it is necessary to improve the

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