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Runway beam

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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 ?
 
Thanks..