A single-girder gantry crane primarily consists of a gantry, a hoisting trolley, a trolley operating mechanism, a driver’s cab, and an electrical control system. The gantry features a box-shaped single-girder structure with two outriggers. The trolley utilizes vertical, reverse-roller technology for loads under 20 tons, and horizontal, reverse-roller technology for loads over 20 tons, operating on one side of the girder. The girder is single-beam, with the outriggers forming an L-shape with the lower crossbeam. Both outriggers typically feature cantilevers, providing strong cross-span capabilities and facilitating the transfer of objects from within the span to beneath the cantilever.