Pushing machine for steel box girder with small curve radius and using method

The invention discloses a pushing machine for a steel box girder with a small curve radius and a using method, the pushing machine comprises a supporting plate, a hydraulic push rod, a connecting block and a transverse plate, the hydraulic push rod is fixedly installed at the upper end of the supporting plate, the connecting block is rotatably installed at the upper end of the hydraulic push rod, and a walking type jack is fixedly installed at the upper end of the transverse plate. And the outer side of the upper end of the walking type jack is sleeved with a mounting piece, a rotating rod is rotationally mounted in the fixing plate, and the outer side of the rotating rod and the outer side of the output shaft are both sleeved with chain wheels. According to the pushing machine for the steel box girder with the small curve radius and the using method, in the rotating process of a rotating rod and an output shaft, a clamping plate can move in a sliding groove and move in the direction of a limiting piece, at t