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The beam lifting crane machine is a kind of gantry crane specially designed for bridge construction. The beam is mainly composed of assembled main girders, legs and cranes. The components are connected with high-strength bolts and easy to disassemble and transport. Compared with ordinary gantry cranes, the installation is convenient, economical and practical. Applicable to the frequent flow of road bridge construction units.link:http://www.chinacranemanufacturer.com/gantry-crane/double-girder-gantry-crane/electric-control-450t-beam-lifting-gantry.html