U -Leg Double girder gantry crane with hook The double girder cranes are used when heavy loads,Website:://.xqcranes.com, wide spans or high working frequency are required than single girder gantry crane. Double girder gantry cranes consist of two torsion-free box girders and four legs to achieve perfect construction stability. This makes double girder gantry cranes especially suitable for lifting and transporting loads over 10 T and for span of more than 25m,load capacities up to 500 T and with spans up to 50 M.The profiles of the main girder are optimally produced using a integrated technology which is weldless , so that maximum performance with a minimum of dead weight can be achieved.