Segmental Launching Gantry is generally used in the erection of Highway Bridge and MRT Bridge, using precast segmental pre-stress concrete box beam (PC beam) assembly. The main feature is the high efficiency of self-travelling construction. It’s composed of the main beam, leg and winch trolley. The main girder is used for bearing load, the leg is to transverse moving, longitudinal moving, leveling, support, cross span, cross scale and other functions, while the winch trolley is used for lifting the precast girder.