A gantry crane, also known as a bridge crane, is a type of crane with a bridge that is supported on the ground track by two side legs.

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

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

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

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

Also, a crane with an arm can be used to expand the working range of the crane through the tilting and rotation of the arm.