Gantry crane

The lifting mechanism, trolley running mechanism and bridge structure of the gantry crane are basically the same as those of the bridge crane. Due to the large span, most crane operating mechanisms are driven separately to prevent the crane from increasing resistance and even causing accidents due to skew operation. The trolley of the gantry crane runs on the bridge, and some trolley is a jib crane.

The outriggers on both sides of the bridge are generally rigid; When the span exceeds 30 meters, one side is usually a rigid leg, while the other side is a flexible leg connected with the bridge through a ball joint, making the gantry a statically determinate system. This can avoid additional stress caused by lateral thrust under external load, and can also compensate for the longitudinal temperature deformation of the bridge. The gantry crane has a large wind area to prevent sliding or overturning under strong wind, It is equipped with an anemometer and a crane rail clamp interlocked with the running mechanism. The cable tray can be cantilever free at both ends; It can also be cantilever at one end or both ends to expand the scope of work. The bridge of semi gantry crane has legs at one end and no legs at the other end, and runs directly on the high platform.