Shield gantry cranes are mainly used in underground trenchless equipment shield machine cutter head and shield installation, as well as the support segment of the tunnel during the construction crane using special lifting device,the spreader can rotate 360.and suitable for cutter installed at different angles.Adopt double trolley structure, two trolley can joint, lift the cutter and can also separate lift segment. When lifting larger tonnage, the lifting will be adopt the open gear drives to reduce equipment costs.