• Categories:Zhongrui News
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• Time of issue:2019-05-28 14:27
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(Summary description)Any object has thermal expansion and contraction, but sometimes it does not change much. We can't see it. The bridge is the same. Due to the change of ambient temperature, the steel cable tray will show thermal expansion and contraction. The outdoor bridge is affected by temperature. For example, the maximum ambient temperature is 40 °C and the lowest temperature is -20 °C. The maximum shrinkage of the cable tray is obtained by the following formula: Δt=11.2 ×10-6×60deg (degrees)×1000mm This concludes that when the temperature difference is 60 °C, Δι =0.672 mm/m, the temperature difference is 50 °C, Δι = 0.560 mm/m, the temperature difference is 40 °C, Δι =0.448 mm/m, the straight line cable tray should be considered in engineering design. For the expansion joints, the spacing of the expansion joints is recommended as follows: 50m when the temperature difference is 40°C; 40m when the temperature difference is 50°C; 40m when the temperature difference is 60°C.