A double-girder gantry truss crane is a large lifting device with a double girder gantry as its main load-bearing structure and a truss design. It combines the high load-bearing capacity of a double girder structure with the lightweight characteristics of a truss design, and is widely used in scenarios that require large spans and heavy loads.
The double main beams are supported on the ground tracks by the end beams (gantry legs) at both ends, forming a movable “gantry” frame. The hoisting trolley runs horizontally along the main beam tracks, and the gantry frame as a whole can move longitudinally along the ground tracks, thereby achieving full coverage of the work area.
Unlike single-girder cranes, these cranes have two parallel main girders connected by end beams to form a gantry structure. The double-girder design significantly increases the load capacity of the equipment, enabling it to handle hundreds of tons or even higher lifting capacities. At the same time, it offers superior structural stability and stronger lateral bending and torsional resistance when operating over long spans (typically 20 meters or more).