How to choose the gantry crane

First, the choice of gantry crane
It is consistent with common gantry crane GB/T14406-1993 and GB5905-86 of the relevant provisions.
Under normal circumstances, from the weight of 50t or less, in the span of less than 35m, no special requirements, should use a single main beam. 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.
Second, the span and the cantilever length
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 of the span should be minimized.
Third, the principle for determining Tread
(A) along a gantry crane to meet stability requirements of the track direction;
(B) the dimensions of the goods to be able to pass the legs flat steel;
(C) pay attention to the track B and the span S proportional relationships, and generally track B = (1/4-1/6) S.
Fourth, determine the pitch size of gantry crane
At work,  bridge gantry crane  and yard external dimensions of goods and transport vehicles between channels should leave some space dimensions, in order to facilitate loading and unloading operations. General transport vehicles in the span of loading and unloading, should be kept above the door legs with 0.7m spacing. Spreader should not work with the transport vehicles with more than 0.5m spacing, cargo interlude legs, there should be more than 0.5m spacing.