In our daily life, bridges often appear in industrial construction. Therefore, people will have less contact with them. But the goods produced after the bridge are closely related to life. So, next, let's go with Xiaobian to understand what the cable tray is? How to select cable tray?
What is cable tray? In fact, the bridge is a support that can support and place cables. Whether it is construction engineering, or power engineering, as long as it is necessary to lay the cable, it must use the bridge. As an important supporting project of the whole wiring project, cable tray has no professional specification to guide at present in China. Now the market is very scarce in this aspect of technology, so the specifications of various manufacturers are lack of universality. Therefore, whether it is the design and selection, or each system of electrical appliances, we should reasonably select the bridge through the number and type of cables. Cable tray has the characteristics of complete variety, light structure, low cost, simple construction, standard installation, beautiful appearance, wide application, high strength, flexible wiring and so on.
1. Material selection of cable tray
The common problem of cable bridge engineering design is how to divide the cable bridge into FRP, steel and aluminum alloy according to the material. The cable tray made of glass fiber reinforced plastic has light weight, good corrosion resistance and water resistance, and is suitable for use in chemical plants. The material is not easy to burn and has a long service life. The general design life is about 20 years, but the price is about 3 times higher than that of steel cable tray. Construction is also very convenient, cutting strong, easy assembly, installation, no fire, for chemical plants such as the project is very practical. Aluminum alloy cable tray is also relatively light, and its load characteristics are basically similar to those of steel cable tray. The price is convenient and 20% higher than galvanized steel cable tray, but the service life is more than 5 times of steel cable tray.
2. Selection of anticorrosive coating on cable tray surface
The anti-corrosion coating on the surface of cable tray is mainly divided into: galvanized nickel, cold galvanized, hot-dip galvanized, powder electrostatic spraying, etc. The service life of galvanizing nickel process is not less than 30 years, the cost is high, and it is also suitable for outdoor heavy corrosion environment; The service life of cold galvanizing process is not less than 12 years, the cost is general, and it is suitable for outdoor light corrosive environment; The life of hot dip galvanizing process is not less than 40 years, the cost is high, and it is suitable for outdoor heavy corrosion environment; The service life of powder electrostatic spraying process is not less than 12 years, the price is general, and it is suitable for indoor normal temperature and dry environment. Therefore, the designer will reasonably select the type of anti-corrosion coating on the surface of cable tray according to the engineering environmental conditions, and will clearly express it in the design documents.
Above, what is the cable tray? And the selection of cable tray related content, Xiaobian introduced to this. For the selection of cable tray, it mainly depends on which aspects to use. I hope it can help you.