Machining and assembling technology for special-shaped decorative steel arch shell of steel box girder

The invention relates to a machining and assembling technology for a special-shaped decorative steel arch shell of a steel box girder. The machining and assembling technology is characterized by specifically comprising the following steps that S1, the steel arch shell is divided; s2, machining of the parts; s3, the unit pieces are machined; s4, splicing and welding the steel arch shell; s5, pre-assembling the steel arch shell; according to the method, the left steel arched girder and the right steel arched girder are assembled in sequence, and two longitudinally-divided end segments of the left steel arched girder are disassembled from a pre-assembled structure and transported to a hoisting position to be installed; the step is repeated for three rounds, and in the fourth round, a first section in the middle of the longitudinal beam of the right steel arched beam is started to be installed; five rounds of assembly are carried out in total, and after the left steel arched girder is assembled, the right steel a