Mounting structure of multi-box-girder steel bridge

The utility model relates to an installation structure of a multi-box girder steel bridge, which comprises a bolting cross beam used for connecting a plurality of steel box girder structures, and thebolting cross beam comprises a cross beam, a screw rod, a nut, a bolt hole and a reserved notch; the steel box girder comprises a steel box girder body, an upper flange connecting plate, a connectingplate, a lower flange connecting plate and a reserved notch. According to the installation structure, a traditional bolting and welding joint, a traditional welding joint and a traditional bolting joint are changed into novel bolting joints, the screw is welded to the flange through plug welding, and it is guaranteed that the upper surface of the flange is flat. And particularly, when the steel bar truss floor support plate is used as a bottom die, the surface of the upper flange must be kept flat. By means of the structure, field welding is avoided, the novel full-bolting joint is adopted, the construction speed is in