Crane Bridge Rail Gap
Crane Bridge Rail Gap
(OP)
I am trying to find out if there is a specification or information on the maximum gap under the crane rail and the girder for an overhead top running bridge crane?
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RE: Crane Bridge Rail Gap
Professional and Structural Engineer (ME, NH, MA)
American Concrete Industries
www.americanconcrete.com
RE: Crane Bridge Rail Gap
RE: Crane Bridge Rail Gap
I don't know of a specified limit for the gap between the rail and the girder.
Professional and Structural Engineer (ME, NH, MA)
American Concrete Industries
www.americanconcrete.com
RE: Crane Bridge Rail Gap
RE: Crane Bridge Rail Gap
RE: Crane Bridge Rail Gap
RE: Crane Bridge Rail Gap
Ask the crane mfr what is an appropriate maximum gap, and use that value to write your own spec. Shim to close the gap, and/or decrease the clamp spacing. Have any shims used tack-welded to the beam, and try to only use single shims [vs. a stack of shims] at each location. Off the top of my head, I'd space the clamps at 16" to 18" intervals, and shim any gaps in excess of 1/32" 'true gap' - measured by sweeping a 1/32" feeler gage under the crane rail.
RE: Crane Bridge Rail Gap
RE: Crane Bridge Rail Gap
If the crane rail is humped up, then it will be forced down as noted above by the load.
If the crane rail supports are sagging,and the unloaded crane rail is "flat", then the rail needs to be properly re-supported with no gaps.
RE: Crane Bridge Rail Gap
RE: Crane Bridge Rail Gap
Dave
Thaidavid
RE: Crane Bridge Rail Gap
What I was able to find out after contacting our rail manufacturer was that by industry standard any gap greater then 3/16" under the rail to the top of the girder for a bridge crane is considered excessive and that no specification or standard addresses the gap.