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RE: Runway beam

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I normally provide the expansion joint in between beams and allow the crane
rail to span over the expansion joint.  Then, within a few feet of the
structural steel expansion joint, I cut a 60 degree angle on the rail to
allow the expansion there.  The angle cut allows the expansion but maintains
positive bearing between the crane wheel and crane rail.

It's an old detail.  There may be better approaches.

Paul F. Blomberg
Jacobs Engineering Group
Phoenix, AZ
From: Stan Mulder
To: seaint(--nospam--at)
Subject: Runway beam
Date: Thursday, February 04, 1999 12:15PM

What details are suitable for overhead crawl beam expansion joints. Usually
gaps at joints should be kept as small as possible (2 mm or say 1/8 ins) to
enable the trolley wheel to pass smoothly over the joint. Sometimes it is
necessary to use a long crawl and introduce expansion joints. Possible
cutting the bottom flange at 45 degrees and reinforcing the bottom flange.
How big can this gap be (3/8 ins) ? Is there some way of making the gap as
large as 1 ins ?