To the expansion and contraction of the cable tray

cable bridge expansion and contraction
cable tray in the current construction industry more and more widely used , but if you choose , choose when to note bridge those issues are very important , the bridge model , the thickness of sheet metal , and specifications are need for validation , in which the expansion and contraction of the bridge is also worthy of concern and attention to the problems , in order to avoid later in the late need to pre careful measurement . the
expansion and contraction of the cable tray following analysis :
due to changes in ambient temperature , steel cable tray will appear the phenomenon of thermal expansion and contraction < / p>

outdoor bridge affected by temperature, the larger

such as environmental temperature of 40 ° C , the lowest temperature of -20 ° C

cable tray obtained maximum shrinkage following formula : Δt = 11.2 × 10-6 × 60deg ( degrees ) x 1000mm

conclude :

the

temperature difference of 60 ° C , Δι = 0.672mm / m < / p > the

temperature difference is 50 ° C , Δι = 0.560mm / m < / p > the

temperature difference of 40 ° C , Δι = 0.448mm / m < / p >

engineering design line segment cable tray should consider the spacing of expansion joints , expansion joints

recommended to take given as follows : When the temperature difference is 40 ℃ 50m ; < / p >

when the temperature difference of 50 ° C for 40m;

when the temperature difference of 60 ° C for 40m.

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