Road and bridge cranes are a type of lifting equipment specifically designed for bridge construction and maintenance. It is usually suspended above a bridge and lifted and transported by a lifting mechanism for goods or building materials. Road and bridge cranes can improve construction efficiency, reduce labor intensity, and ensure the smooth progress of bridge construction. Road and bridge cranes are usually composed of main beams, support beams, large vehicles, small vehicles, and lifting mechanisms. The main beam is the main load-bearing structure of the road and bridge crane. The supporting beam is used to support the main beam and balance the lifting weight. The large vehicle is responsible for horizontal movement on the main beam, the small vehicle is responsible for vertical movement on the large vehicle, and the crane structure is used to achieve the lifting and lowering of goods.