42results about How to "Avoid local stress" patented technology

The invention discloses a box girder web longitudinal bar installing and forming device and method, and belongs to the technical field of box girder web construction. The box girder web longitudinal bar installing and forming device comprises a ground rail walking system, a welding portal frame, a welding mechanism and a longitudinal bar moving and supporting assembly; the welding portal frame is fixedly installed at the moving end of the ground rail walking system, outer welding linear modules are symmetrically and fixedly installed on the welding portal frame, a moving installation frame is fixedly installed at the moving ends of the outer welding linear modules, and an inner welding linear module is fixedly installed in the middle of the welding portal frame. A movable supporting frame is fixedly installed at the movable end of the inner welding linear module. Welding mechanisms are mounted on the movable mounting frame and the movable supporting frame; the welding mechanism comprises a welding guide assembly, a rib supporting plate, a lateral rib pressing assembly, a longitudinal rib pressing assembly and an electric resistance welding structure. By means of the mode, the box girder stirrups and the longitudinal bars are positioned before welding, the welding efficiency is improved, and meanwhile the welding precision is guaranteed.