The steel roof of a project adopts a large-span box-shaped overhang structural system

which is composed of a large number of nodes and subsidiary bars

and the node ends are all bent and twisted structures. This paper describes the innovation and application of the key process technology of this node

through structural optimization

innovation of the combined bending process

and strengthening the welding quality control of the assembly of shaped members

thus reducing the number of bending and twisting structures of the whole roof

and achieving efficient production and high precision control.