A gantry crane is a type of gantry crane specifically designed for bridge construction. The lifting machine is mainly composed of assembled main beams, supporting legs, overhead cranes, etc. The components are connected by pin shafts and high-strength bolts, which are easy to disassemble, assemble and transport; Compared with ordinary gantry cranes, installation is convenient, fast, economical and practical. Suitable for road and bridge construction units that frequently move.

The beam lifting machine can be used to lift prefabricated beams in combination with two cranes, or a single crane with dual lifting devices can be used to lift prefabricated beams. The lifting capacity of two lifting machines at the same time 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 mechanized movements. Mainly used to lift prefabricated beams from the beam making platform to the beam storage platform, and after the maintenance of prefabricated beams is completed, they are lifted from the beam 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 to construct dry bridges with low pier height.

1. Improve the positioning accuracy of prefabricated beams and reduce the impact on the structure of the lifting machine by lowering the operating speed of the lifting and running mechanisms.

2. The internal space of the lifting machine should be large enough to meet the assembly needs of lifting prefabricated beams and bridge erecting machines.

3. The main steel structure should be considered for disassembly and transportation while meeting the requirements of strength, stiffness, and stability.

When using two cranes to lift prefabricated beams, it is necessary to ensure that the two machines operate synchronously.