Middle support leg is made up of hanging institution, roller institution, core plate, round girder, driving gearbox, driven gearbox, fixing device, transverse sliding rail and pins.Walking type bridge girder launcher

Middle support leg is important support of rear part of the bridge girder launcher. Realize the middle support leg moving forward by hanging institution; drive the main girder to move forward smoothly by roller institution; make the complete machine move transversely along the rail by transverse moving gearbox and transverse sliding rail; use core plate to adjust angle to construct skew bridge and curved bridge easily; round girder connects left support leg and right support leg