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In Australia, Clause 7.20.8 of AS 1418.1-2002 limits gaps to 3 mm. When installing rails, the ambient temperature needs to be considered. For a temperature range of 5 to 40 degrees C, install with joints closed at 40 C and with 3 mm gaps at 5 C.
For heavy duty runway systems, rails should be welded, but this requires careful attention to detail. In some cases, bevelled joints are used instead.
Excessive gaps can have significant effects on the fatigue life of heavy duty runways. However, they can also have significant effects on accelerating the utilisation of DWP (Design Working Period) for all cranes.
John Loiterton
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∙ 11y ago
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