The gantry crane, also known as a bridge crane, is a type of overhead crane with a bridge supported by legs on the ground track.

Composed structurally of the gantry, large vehicle running mechanism, crane trolley, and electrical parts, etc.

Some gantry cranes have only one leg on one side, with the other side supported by a factory or pier for operation, known as semi-gantry cranes.

The overhead bridge of the gantry crane, including the main beam and end beam, the legs, and the lower transverse beam, etc., constitutes the structure.

To expand the crane's operational range, the main girder can extend beyond the legs on one or both sides, forming a cantilever.

The crane trolley with an arm can also be used to extend the crane's operational range, via the boom's pitch and rotation.