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The difference between the four commonly used bridges in Chengdu weak current projects

by:Keyable     2021-08-01
The difference between the four commonly used bridges in Chengdu's weak current projects. The commonly used cable bridges in weak current projects include: trough type bridges, tray type bridges, aluminum alloy bridges and net format bridges. 1. The difference between trough-type cable tray and tray-type cable tray. Both the trough-type cable tray and the tray-type cable tray can be used to lay power cables; the section and structure are different. Closed trough boxes, uncovered trays, and ladder frames are all cable trays. The three types of trays have different structural forms, and some performances are different. For example, the protection and the trough are the best, the ladder is the worst, but the ventilation and cooling performance is poor. On the contrary, the Chengdu Weak Current Project. The advantage of trough cable tray is shielding and anti-corrosion. It is mainly suitable for laying small cross-section but very large number of wires and cables; while tray type cable tray has the advantage of large load and good heat dissipation, which is mainly used for laying large cross-section but relatively small number Power cable Chengdu weak current project. From the appearance point of view, the trough cable tray is a fully enclosed cable tray. The pallet bridge generally refers to the trough type bridge with holes. Due to the opening of the heat dissipation holes, the thickness of the tray-type bridge plate should be thicker. Tray type cable tray 1. The main features of trough type cable tray are shielding interference, anti-corrosion, and fire prevention. It has a good effect on the shielding interference of control cables and the protection of cables in heavy corrosive environments. It has good effects on the shielding interference of control cables and cables in heavy corrosive environments. The protection has good effect. It is suitable for laying computer cables, communication cables, thermocouple cables and control cables of highly sensitive systems. It is used to lay small but large number of wires and cables. This is also the most economical and practical type of bridge in weak current projects. 2. The surface treatment of tray-type bridge can be divided into three types: galvanizing, electrostatic spraying and hot-dip galvanizing according to user needs. The fireproof and anti-corrosion performance is relatively poor, and special anti-corrosion treatment must be done in severe corrosive environments. There are many waist-shaped holes at the bottom of the tray bridge to facilitate heat dissipation, light weight, and large load. It is mainly used to lay the Chengdu weak current project of power cables with a large section and a small number. 2. Galvanized bridge and hot-dip galvanized bridge. Many people think that galvanized bridge is hot-dip galvanized bridge, but it is wrong. Galvanized bridge is not equal to hot-dip galvanized bridge. Hot-dip galvanized bridges can be divided into 'hot-dip galvanizing' and 'hot-dip galvanizing'. Galvanizing is 'cold galvanizing' or 'electro-galvanizing'. The galvanized bridge frame is made of 'cold galvanized sheetThe cold galvanized galvanized layer of cold galvanized bridge is brighter than hot galvanized, but it is thinner and has weaker corrosion resistance. The hot-dip galvanized bridge frame has a thicker hot-dip galvanized coating and strong corrosion resistance. The life span of the galvanized bridge is longer, and hot-dip galvanizing has an absolute advantage in terms of hardness and impact resistance. Of course, the cost of hot-dip galvanized bridge is higher. Galvanized cable trays usually used in engineering are actually cold-galvanized trays. Because the production cost of hot-dip galvanized trays is more expensive, manufacturers seldom accumulate inventory. Sites with higher construction requirements will use hot-dip galvanized trays. Customers To purchase and designate 'hot-dip galvanized bridge frame3. Aluminum alloy cable tray has the characteristics of beautiful appearance, simple structure, unique style, large load capacity and light weight. After the surface of the aluminum alloy cable tray is anodized, it is not only anti-corrosion, but also anti-electromagnetic interference, especially anti-shielding interference, which is irreplaceable for steel bridges. Of course, the price is much higher than that of steel bridge truss. The disadvantage is that it is not suitable for places with high engineering fire protection requirements. 4. Net format cable tray Open network tray is also called as its name implies: metal net format cable tray, open cable tray, and mesh tray. The grid format cable tray comes from Europe and is a development and innovation of the cable tray. Due to the characteristics of the grid format, the grid format cable tray is not suitable for outdoor or occasions where there is polluted corrosive air and splashing liquid; it is suitable for commonly used in highly integrated data room, Dust-free workshops, communication inside and outside the equipment, electrical circuits, etc. Features: (1) Improved system upgrade and maintenance capabilities, leaving room for upgrades; (2) Flexible application in the integrated wiring system, suitable for the upper and lower wiring trays Routing; (3) The overhaul of lines and equipment is very fast and safe; (4) It saves the expensive cost of secondary repeated investment; (5) The weight is only 1/5 of the traditional bridge; (6) It is 2/ less than the traditional bridge. 3 installation time; (7) The wiring system and the surrounding production environment are cleaner, sanitary and beautiful; (8) The mesh structure makes it better for heat dissipation and effectively extends the service life of the cable. When selecting the load level of the cable tray, the working uniform load of the cable tray should not be greater than the rated uniform load of the selected cable tray load level. If the actual span of the support and hanger of the cable tray is not equal to 2m, the working uniform The cloth load should meet the requirements. Under the condition that various components and supports and hangers meet the corresponding load conditions, their specifications and dimensions should match the straight sections and elbow series of the pallets and ladders. Chengdu Weak Current Project. In engineering practice, the problem in the selection of the size of the cable tray is either too large or too tight. How to choose the size of the cable tray reasonably? Articles 8, 10, and 7 of the 'Code for Electrical Design of Civil Buildings' (JGJ16-2008) stipulate: 'The ratio of the total cross-sectional area of u200bu200bthe cable to the cross-sectional area in the tray shall not be greater than 40% for power cables; and 50% for control cables. '
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