Single and double girder gantry crane used in the structural performance and the difference

      Single girder  gantry crane  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 gantry crane doors legs with L-and C-type forms. L-manufacture and installation convenience, the force is good, the quality of their small, but, lifting cargo space through the legs at a relatively small number. The feet made ​​of C-inclined or curved shape, the purpose is to have large lateral space to pass the goods foot.
       Double girder  bridge gantry 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. More commonly used box-shaped structure.
   (A) single girder and double girder gantry crane use different normal circumstances, since less weight 50t, span 35m or less, no special requirements, should use single girder  overhead gantry crane .  If you require a large gate leg width, high working speed, or frequently lifting heavy pieces, grew up pieces, you should choose double girder gantry crane.
   (2) the length of the span and cantilever span gantry crane crane itself is affecting the quality of the important factors. Selection, to meet the conditions of use and equipment conform span series of standards under the premise should minimize single girder gantry crane span.