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Launch crane The launching crane is special launching equipment for building main span of Cable-Stayed Bridge. The working mode of this launcher is that lifting precast segments from boat which under the bridge, and the launcher at the cantilever state. The launcher will move forward automatically after precast segments assembling finish in the air, then one cycle completed. The characteristics of this launcher working can be summed in three points: one, high lifting height; two, heavy load at cantilever state; three, precise contraposition in the assembly process of heavy precast segments girder.