Gantry crane selection

gantry crane gantry structure is generally based on the form of the main beam form spreader form classification.
Sub-frame structure by
(A) full gantry crane: the main beam without overhang, the car performed in the main span.
(B) semi-gantry cranes: legs are height difference, according to the civil use of space requirements.
(C) double cantilever  bridge gantry crane :  The most common form of a structure, the structure of the force and the effective use of site area is reasonable.
(D) single cantilever gantry crane: This structure is often limited due to the venue being used.
Press the main beam structure in the form of
(A) single girder gantry crane
Single girder gantry crane cantilever simple structure, easy installation, the quality of their small, mostly off-track girder box-shaped frame structure. And double-girder gantry crane compared to the overall stiffness is weaker. Therefore, when the starting weight Q ≤ 50t, span S ≤ 35m, we can use this form. Single girder  overhead gantry crane  main gate door legs with L-type and C-type two forms. L-type manufacturing, easy installation, good force conditions , the quality of their small, but, lifting cargo space through the legs at a relatively small number. C shaped legs made ​​of inclined or curved shape, aimed at a larger horizontal space to make the goods pass the feet.
(b) double girder overhead crane
   Double girder overhead crane carrying capacity, span, overall stability, variety, but the quality of their starting weight with the same single-girder gantry crane compared to the bigger, the cost is higher. According to the main beam structure is different, can be divided into box girders and trusses in two forms. Now more commonly used box-shaped structure.