The span of an overhead travelling crane refers to the distance between the center lines of the wheels at both ends of the main girder of the crane, that is, the distance between the center lines of the cart rails. The spans of bridge cranes are 10.5m, 13.5m, 16.5m, 19.5m, 22.5m, 25.5m, 28.5m, 31.5m, etc.
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