Bridge girder erection machine for whole hole erection of steel tube concrete truss girders

The invention discloses a bridge girder erection machine for whole hole erection of steel tube concrete truss girders. The bridge girder erection machine is characterized by being provided with a railflat car, main trusses, lifting cranes, a front support leg, a middle support leg, a rear temporary support, an electrical system and a hydraulic system which are composed into a complete structure system. By virtue of improvement, firstly, the bridge girder erection machine is balanced by utilizing steel truss girders, and the rail flat car transports the steel truss girders and forward moves synchronously with the bridge girder erection machine so as to finish perforation; and secondly, the bridge girder erection machine lifts the steel truss girders to pass through the middle support leg,and front and rear cranes forward move synchronously in position and are lowered and mounted so as to finish whole hole erection. By virtue of a process for whole hole erection of the steel truss girders through the bridge gir