Single girder or double girder crane

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Information about Single girder or double girder crane
Technology

Published on February 19, 2014

Author: SimbaZhao

Source: slideshare.net

Description

A common misconception is that double girder
bridge cranes are more durable.
Based on the CMAA (Crane Manufacturers Association of America) specifications, both single and double girder cranes are equally rigid,strong, and durable. This is because single girder cranes use much stronger cross girders than double girder cranes, and single girder cranes have lateral bracing.

Single or Double Girder Crane A common misconception is that double girder bridge cranes are more durable. Based on the CMAA (Crane Manufacturers Association of America) specifications, both single and double girder cranes are equally rigid, strong, and durable. This is because single girder cranes use much stronger cross girders than double girder cranes, and single girder cranes have lateral bracing. The Difference is in the Hook Height The principle difference between single and double girder cranes is hook height (how far above the floor your hoist will lift). Double girder cranes provide better hook height.Double girders typically allow 18-36 inches higher lift. Double girder cranes can provide more lift, because the hoist is placed between the cross girders rather than under them. Therefore, the depth of the cross girder is gained in switching to double girders.

Cost Considerations Single girder cranes may cost less for several reasons:      Only one cross girder is required The trolley is simpler Fright expenses are reduced Installation is faster Runway beams are lighter However, not all cranes should be designed with a single girder... ????? Single girder cranes have been built in spans over 100 feet and capacities of over 100 tons but typically cost effective engineering dictates that single girder cranes be considered as per the chart. Ultra Low Headroom (ULH) trolleys Double girder cranes typically have the hoist and trolley riding on top of the cross girders. As an option, we can provide a trolley that rides between the cross girders. This may be appropriate if: maximum hook height is required your cross girders, as well as your hoist, must be the maximum height above the floor you must minimize the distance above your runway beam you need the crane to be more compact

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