Large-span suspension arm bridge deck crane

The large-span suspension arm bridge deck crane comprises a rack, a lifting mechanism and a lifting appliance, the lifting mechanism and the lifting appliance are arranged on the rack, guide mechanisms playing a role in guiding a segmental beam are arranged on the two sides of the rack correspondingly, each guide mechanism comprises a supporting plate fixedly connected with the rack, and a guide plate is hinged to the end, away from the rack, of each supporting plate; the lifting appliance is located between the two guide plates, a first driving piece for driving the guide plates to rotate is arranged on the supporting plate, and when the guide plates rotate to be vertical, the guide plates abut against the spliced segmental beams, and the lower ends of the guide plates exceed the lower surfaces of the spliced segmental beams. The displacement of the segmental beam in the width direction is limited in the hoisting process of the segmental beam, so that the position of the segmental beam is corrected, and the