The crane body is supported on a gantry system with equalized beams and wheels that run on the gantry rail, usually perpendicular to the trolley journey course. These cranes are available all sizes, and a few can transfer very heavy loads, particularly the extremely large examples utilized in shipyards or industrial installations. A special model is the container crane (or “Portainer” crane, named by the first manufacturer), designed for loading and unloading ship-borne containers at a port. In many instances the price of a bridge crane may be largely offset with savings from not renting cell cranes in the construction of a facility that makes use of lots of heavy process gear. The commonest overhead crane use is in the metal business.
These cranes are usually constructed in large sizes and may weigh up to 350 tons. Self-erecting tower cranes are transported as a single unit and can be assembled …




