Due to the change of environmental temperature, steel cable tray will expand with heat and contract with cold. Outdoor bridges are greatly affected by temperature. For example, if the highest ambient temperature is 40℃ and the lowest ambient temperature is -20℃, the maximum shrinkage of cable tray can be obtained by the following formula:

δ t =11.2×10-6× 60deg (degree )×1000 mm.

From this, it is concluded that:

When the temperature difference is 60℃, Δ ι = 0.672 mm/m.

When the temperature difference is 50℃, δ δδι= 0.560mm/m/m/m/m.

When the temperature difference is 40℃, Δ ι = 0.448 mm/m.

Expansion joints should be considered in the engineering design of linear cable bridge, and it is suggested that the expansion joint spacing be determined as follows:

When the temperature difference is 40℃, it is 50m.

When the temperature difference is 50℃, it is 40m.

Extended data:

Production technology of reducing elbow

Mainly in the following aspects:

1, the elbow blank is needed as the raw material, which can save the die cost and obtain the elbow with any caliber.

2, the blank is an elbow blank, which is simple to work, easy to ensure the accuracy and convenient to assemble and weld.

3. Due to the above two reasons, the manufacturing cycle can be shortened and the production cost can be greatly reduced.

References:

Baidu Encyclopedia-reducing elbow