Virtual pre-assembly process for deformed steel

The invention discloses a deformed steel virtual pre-assembly process, and relates to the technical field of steel structures. Comprising the following steps: carrying out three-dimensional grating surface scanning on a component by adopting industrial-grade precision one-time molding automatic three-dimensional point cloud scanning equipment; virtual space construction is conducted on each component section, entity digital scanning is conducted on the steel structure components and the sections through a three-dimensional scanner, and three-dimensional coordinates of the components and the sections are obtained; all the coordinate points are integrated through graphic processing software, and a BIM model is established; comparing the dimensions of the whole member and the segments to obtain the deviation of the front and rear models, and then translating and overturning the models of the adjacent member segments by using software to obtain a virtual pre-assembly model of the deformed steel structure; and acc