New Combined Cable Bridge Made Of Aluminum Alloy Plate

1. In the engineering design, the layout of the bridge should be based on economic rationality, technical feasibility, operational safety and other factors to determine the program, but also to fully meet the construction and installation, maintenance and cable laying requirements.

2. The height of the bridge from the ground when laid horizontally is generally not less than 2.5m, when laid vertically from the ground 1.8m below the part should be protected by a metal cover, except when laid in the electrical special room. Cable bridges laid horizontally in the equipment mezzanine or on the human road and below 2.5m, should take protective grounding measures.

3. The bridge, trunk and its support hanger used in a corrosive environment, should be made of corrosion-resistant rigid materials. Or take anti-corrosion treatment, anti-corrosion treatment should meet the project Environment and durability requirements. Corrosion resistance requirements are high or require clean places, it is appropriate to use aluminum alloy cable bridges.

4. The bridge in the fire requirements of the section, the cable ladder frame, tray with fire-resistant or non-combustible properties added to the plate, network and other materials constitute a closed or semi-closed structure, and take in

5. The need to shield the cable line of electromagnetic interference. Or have protection from external shadows such as outdoor sunlight, oil, corrosive liquids, flammable dust and other environmental requirements. Should be selected non-porous tray type cable tray.

6. In places prone to dust accumulation, cable bridges should be selected to cover; in the public channel or outdoor across the road section. The bottom bridge should be added to the pad or use non-porous tray.

7. Different voltages, different uses of the cable should not be laid in the same layer of cable bridges:
(1) 1kV and 1kV and 1kV and 1kV.
(2) more than 1kV and 1kV and below the cable.
(3) The same path to the first level of load supply of double-loop cable.
(4) Emergency lighting and other lighting cables.
(5) Power, control and telecommunication cables. If different levels of cable laid in the same cable tray, the middle should be increased to isolate the partition.

8. When the length of the steel straight section of more than 30m, aluminum cable bridges more than 15m. Or when the cable bridge through the building expansion (settlement) joints should be left with O-30mm compensation margin. Its connection should be used to expand the connection plate.

9. Cable ladder, tray width and height of the choice should be in line with the filling rate requirements, cable in the ladder, tray filling rate in general, power cable can be 40%-50%, control. Cable can be 50%. 70%. And it is appropriate to set aside l0% a 252 project development margin.

10. In the selection of the load level of the cable bridge if the cable bridge support hanger of the actual. The actual span is not equal to 2m. Then the working average load should meet. Where qG - working uniform load, kN/m. qE---- rated uniform load, kN/m. LG - actual span distance, m.