The Launching Gantry is the equipment that puts the prefabricated beams on the prefabricated bridge piers. The bridge erecting machine belongs to the category of cranes, because its main function is to lift the beams, then transport them to the location and then put them down. But it is very different from the crane in the general sense. The requirements are harsh, and there is a traveling on the beam, or it is called a longitudinal shift.