Gantry cranes are generally classified according to the structure of the portal frame, the form of the main beam, and the form of the spreader.
(1) Full gantry crane: The main beam has no overhang, and the trolley is carried in the main span.
(2) Half gantry crane: The outrigger has a height difference, which can be determined according to the civil construction requirements of the site.
(3) Double cantilever gantry crane: the most common structural form, the force of the structure and the effective use of the site area are reasonable.
The crane operating mechanism generally only uses four driving and driven wheels.
The metal structure of the bridge frame is composed of the main beam and the end beam.
The main beam and the end beam are rigidly connected, and the two ends of the end beam are equipped with wheels to support the bridge to run on the elevated frame.
The cross-sections of the off-track box-shaped double girder and the off-track box-shaped single main girder are composed of upper and lower flange plates and main and auxiliary webs of unequal thickness. The trolley rails are arranged above the main webs, and the short stiffening in the box body The slab can be omitted, and the off-track box-shaped single main girder is replaced by a wide flange box main girder instead of two main girders. The dead weight is small, but the manufacturing is more complicated.
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