According to the processing features and requirement of box beam, the cover plates of 4 sides must be connected tightly with the internal reinforcing plates to avoid the out-flowing of slag liquid when doing electro-slag welding. At same time the internal reinforcing plates inside the whole piece of box beam are discontinuousness, so our company developed this movable gantry type box-beam assembling machine. This machine is the important equipment for the box-beam production, mainly used in the assembling of box-beam. Specifications: 1) BOX beam width: 300 1,200mm 2) box beam height: 300 1,200mm 3) box beam length: 4,000 15,000mm 4) Main machine moving speed: 4m/min, 6m/min 5) Max load weight of roller: 20MT 6) Roller length: 15,000mm 7) Roller motor power: 2.2kW 8) Hydraulic station power: 11kW 9) Machine moving power: 0.85/1.1kW x 2