Besides the more frequently used half-gantry crane, travelling wall cranes are often used for additional and 3-dimensional operations, in the workshop space under overhead cranes. Such travelling wall cranes operate on crane gantries, which are foreseen along one of the side walls at a specified height and specified interval, in parallel to one another. The lower crane gantry takes up the vertical and horizontal forces, while the upper gantry only supports the horizontal forces.
The major advantage of travelling wall cranes is that there is no additional hindrance at a floor level, such as a crane gantry or the foot of a half-gantry crane, which occupies a certain length and width of the workplace.