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Thermal expansion and contraction of cable trays

(Summary description)由于环境温度变化,钢质电缆桥架会出现热胀冷缩的现象。室外桥架受温度影响较大例如环境最高温度为40℃,最低温度为-20℃,则电缆桥架的最大收缩量按下式求得:  Δt=11.2×10-6×60deg(度)×1000mm  由此得出结论:  温差为60℃时,Δι=0.672mm/m  温差为50℃时,Δι=0.560mm/m  温差为40℃时,Δι=0.448mm/m  工程设计中直线段电缆桥架应考虑伸

Thermal expansion and contraction of cable trays

(Summary description)由于环境温度变化,钢质电缆桥架会出现热胀冷缩的现象。室外桥架受温度影响较大例如环境最高温度为40℃,最低温度为-20℃,则电缆桥架的最大收缩量按下式求得:  Δt=11.2×10-6×60deg(度)×1000mm  由此得出结论:  温差为60℃时,Δι=0.672mm/m  温差为50℃时,Δι=0.560mm/m  温差为40℃时,Δι=0.448mm/m  工程设计中直线段电缆桥架应考虑伸

Information
Due to changes in ambient temperature, the steel cable tray will experience 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 leads to the conclusion:
 
When the temperature difference is 60 °C, Δι =0.672 mm/m
 
When the temperature difference is 50 °C, Δι = 0.560 mm/m
 
When the temperature difference is 40 ° C, Δι =0.448 mm / m
 
In the engineering design, the cable tray of the straight section should consider the expansion joint. The spacing of the expansion joint is recommended according to the following: 50m when the temperature difference is 40 °C;
 
40m when the temperature difference is 50 ° C;

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