The lifting crane is a gantry crane specially designed for bridge construction. The lifting machine can be used to lift prefabricated beams with two cranes, or with a single crane and two lifting tools to lift prefabricated beams. The lifting capacity of two lifting machines simultaneously is generally 450 tons, and the lifting capacity of a single lifting machine can usually reach 900 tons. It is equipped with leg walking, overhead crane walking, and overhead crane lifting equipment, which can achieve all-round mechanized movements. Mainly used to lift prefabricated beams from the beam making platform to the storage platform, and after the maintenance of prefabricated beams is completed, they are lifted from the storage platform to the beam transport vehicle. As a lifting equipment, complete the assembly and disassembly of the bridge erecting machine. It is also used for erecting dry bridges with low piers.