Single girder gantry crane have two shape. They are box-type and truss.
- Box-type:Single girder gantry crane with box is widely used with standard CD MD Electric Hoist as the lifting mechanism,and the electric hoist traversing along the lower flange of the I-Steel of the main girder,which is made up of C-steel and I-steel. It is a medium-size crane which travels in track.
- Truss crane:The structure of single girder gantry crane with truss is consist of steel truss.So it is cheaper an lighter than box-crane.When the building is inadequate to support a bridge crane,trusses is almost the best solution .