How to solve the problem of heat bilges cold shrink cable tray

How to solve the problem of heat bilges cold shrink cable tray? Small make up have their own unique insights and related data, provide everybody to learn communication:
Cable bridge in our country the northern area, heat bilges cold shrink phenomenon will be obviously, in the northeast region, the highest temperature in summer up to 40 degrees, winter minimum temperature 40 degrees below zero, which requires the cable tray to along with the change of temperature can be normal use. Therefore, to properly design shrinkage, as follows:
Δ t = 11.2 x 10-6 x 60 deg (c) x 1000 mm
Therefore draw the conclusion:
When the temperature was 60 ℃, Δ ι = 0.672 mm/m
When the temperature is 50 ℃, Δ ι = 0.560 mm/m
The temperature of 40 ℃, Δ ι = 0.448 mm/m

Engineering design of straight line cable collect ark should consider expansion joint, expansion joint spacing suggested by the set of the following:
When the temperature is 40 ℃ to 50 m;
When the temperature of 50 ℃ for 40 m;

When the temperature of 60 ℃ to 40 m;

Weifang Guqiang Cable Tray Co.,Ltd