Gantry crane classification according to the main beam structure

(1) Joist
Using angles or welded I-beam structure, the advantage of low cost, light weight, wind resistance.jib crane However, due to the welding points and trusses own shortcomings, joist also has a large deflection, stiffness is small, relatively low reliability, require frequent inspection of solder joints and other shortcomings, applies to the safety requirements are lower, from the weight of the smaller venue.
(2) Box
Use steel plate welded into box-type structure, with high security, rigidity and other characteristics. Generally used for large tonnage and large tonnage gantry  hoist crane,   Box also has a high cost, since the major drawbacks such as poor wind resistance.
(3) Cellular Beams
Generally referred to as "isosceles cellular beam", the main beam is triangular face, belly on both sides of the honeycomb inclined, there are upper and lower chords. Cellular beam and joist girder absorbing characteristics have greater than joist stiffness,Steel crane the smaller the deflection, and higher reliability. However, due to welded steel plate, weight, and cost is slightly higher than the joist for the use of frequent or large venues or lifting beam field.