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Supersized gantry crane In ZZHZ, supersized gantry crane refers gantry crane for lifting heavy box girder for high speed railway construction, such as 450t, 900t, 1200t and so on. Same with common gantry crane, the supersized gantry crane moves along rails longitudinally and its trolley lifts and moves precast girders transversely. It is mainly made up of main girder, support legs, crane moving system, trolley, electrical system and other parts. Till now, the biggest gantry crane made by ZZHZ is 1200t, which is used to lift concrete girder in Qingdao Bay Bridge Project. Supersized gantry crane made by ZZHZ is of steel box girder structure, quite firm and stable. With reliable quality and perfect service, it enjoys a good fame in crane fields in China.