The gantry crane, also known as a bridge crane, is a type of crane with a bridge that is supported by ground-mounted legs on both sides, and it is widely used in the construction industry. However, different cranes have different applications.

1. Full-Gate Crane: The main girder has no overhang, and the trolley operates within the main span.

2. Semi-gate crane: The legs have different heights, which can be adjusted according to the civil engineering requirements of the site of use.

3. Double-armed overhead crane: A common structural form with reasonable structural load distribution and efficient use of site area.

4. Single girder overhead crane: This structural type is often chosen due to site limitations.