Gantry crane 

1. full gantry crane: no overhang of the girder, the car in the main span; 2. semi gantry cranes: leg height difference can be determined in accordance with construction requirements for using site. Cantilever crane 1. double cantilever crane: the most common form of a structure, the structure of the force and the effective use of space is reasonable. 2. single cantilever crane: this structure is often being selected because of space constraints.