The cable bridge is divided into trough, tray and ladder type, net format and other structures, consisting of brackets, support arms and mounting accessories. It can be erected independently, or it can be attached to a variety of buildings (buildings) and pipe racks, reflecting the characteristics of simple structure, beautiful appearance, flexible configuration and easy maintenance, all parts need to be galvanized, installed in the building Outside the open bridge, if it is in the vicinity of the sea or belong to the corrosion area, the material must have anti-corrosion, moisture resistance, good adhesion, high impact resistance properties.
The main components of the cable tray:
The support for the cable tray installation is accomplished through the uprights and brackets. The post is the main component supporting the cable tray; the load of the tray is transmitted to the post by the support arm. Therefore, the uprights and brackets are the two main components of the cable tray installation.
Overview
The cable tray is divided into trough, tray and ladder type, net format and other structures, composed of brackets, support arms and mounting accessories (see Figure 1). When selecting a model, pay attention to whether all the components of the bridge meet the requirements for serialization, generalization, and standardization. The bridge inside the building can be erected independently or attached to various structures (buildings) and pipe racks. It should be characterized by simple structure, beautiful appearance, flexible configuration and easy maintenance, all parts need to be galvanized. If the bridge is installed outside the building in the open air, if it is near the sea or belongs to the corrosion area, the material must have the characteristics of corrosion resistance, moisture resistance, good adhesion, and high impact strength. The bridge frame industry is constantly reorganized and optimized, making the enterprise bridge stand out from the rest, and the surface technology is cold galvanized, hot-dip galvanized, electrostatically sprayed, anti-grid fire coating material, baking paint and so on. The products are widely used in petrochemical industry, metallurgy, electric power, school communications, high-rise buildings and other fields, with beautiful appearance, strong corrosion resistance, versatility, flexible installation, complete varieties and other characteristics. In the "quality first, reputation first, management-oriented, sincere service," the purpose. In order to reduce weight, it is also possible to use aluminum alloy cables and FRP bridges. Their external dimensions and load characteristics are basically similar to those of steel bridges. Due to different proportions of aluminum and steel (Al=2.7, Fe=7.86, by weight, the ratio of aluminum to steel About 1:3, according to the market price of the two materials, the cost of the aluminum alloy bridge is 2.0 times higher than that of the similar galvanized steel bridge. The aluminum alloy bridge has the advantages of beautiful appearance, light weight and easy installation. Alloy bridges have been applied in some projects.
Bridge selection
1. In the engineering design, the layout of the bridge should be comprehensively compared based on factors such as economic rationality, technical feasibility, and operational safety in order to determine the best plan and fully meet the requirements for construction installation, maintenance and cable laying.
2. The height from the ground when the bridge is laid horizontally is generally not less than 2.5m, and the metal cover shall be added to the part less than 1.8m from the ground when it is laid vertically, except when it is laid in a special electric room. The cable bridge shall be laid horizontally on the equipment mezzanine or horse track and shall be less than 2.5m. Protective grounding measures shall be taken.
3. Bridges, trunkings and their hangers used in corrosive environments should be made of corrosion-resistant rigid materials. Or take anti-corrosion treatment, anti-corrosion treatment should meet the engineering environment and durability requirements. For places with high requirements for corrosion resistance or requiring cleanliness, aluminum alloy cable trays should be used.
4. In the section where there is a fireproof requirement, the bridge can be added in the cable ladder frame, tray with fire-resistant or flame-retardant properties, mesh, etc. to form a closed or semi-closed structure, and taken in the bridge and its hanger The surface is painted with a fireproof coating and other measures. Its overall fire resistance should meet the requirements of relevant national standards or standards. In places where the fire protection requirements are high, aluminum alloy cable trays should not be used.
5 need to shield the electromagnetic interference cable lines. If there is protection against external shadows, such as outdoor sunshine, oil, corrosive liquids, flammable dust, and other environmental requirements, non-porous tray type cable trays should be used.
6. In the places where dust can easily accumulate, the cable trays should be covered; in the public passages or outdoor cross-road sections, underlay bridges should be provided with a backing plate or non-porous trays.
7. Cables of different voltages and different purposes should not be laid in the same cable tray:
(1) Cables of 1 kV and above and 1 kV and below: (2) Dual-loop cables supplying the same path to the first-order load; (3) Cables for emergency lighting and other lighting: (4) Power, control and telecommunication cables. If different grades of cables are laid on the same cable tray, spacers should be added in the middle.
8. When the length of the steel straight section exceeds 30m, the aluminum alloy cable tray exceeds 15m, or when the cable tray passes through building expansion/contraction (sedimentation) joints, there should be O-30mm compensation margin, and the connection should adopt telescopic connection plates.
9. The choice of cable ladder, tray width and height shall meet the requirements of filling rate. The filling rate of cables in ladder frames and trays is generally 40%-50% for power cables and 50%-70% for control cables. . It is also advisable to set aside 10% to 25% of the project development margin.
10. When selecting the load level of the cable tray, the working uniform load of the cable tray shall not be greater than the rated uniform load of the selected cable tray load class. If the actual span of the cable tray hanger is not equal to 2m, then The work uniform load should meet: qG----in the work, uniform load, kN/m; qE----the rated uniform load, kN/m; LG---- actual span, m.
The main components of the cable tray:
The support for the cable tray installation is accomplished through the uprights and brackets. The post is the main component supporting the cable tray; the load of the tray is transmitted to the post by the support arm. Therefore, the uprights and brackets are the two main components of the cable tray installation.
Overview
The cable tray is divided into trough, tray and ladder type, net format and other structures, composed of brackets, support arms and mounting accessories (see Figure 1). When selecting a model, pay attention to whether all the components of the bridge meet the requirements for serialization, generalization, and standardization. The bridge inside the building can be erected independently or attached to various structures (buildings) and pipe racks. It should be characterized by simple structure, beautiful appearance, flexible configuration and easy maintenance, all parts need to be galvanized. If the bridge is installed outside the building in the open air, if it is near the sea or belongs to the corrosion area, the material must have the characteristics of corrosion resistance, moisture resistance, good adhesion, and high impact strength. The bridge frame industry is constantly reorganized and optimized, making the enterprise bridge stand out from the rest, and the surface technology is cold galvanized, hot-dip galvanized, electrostatically sprayed, anti-grid fire coating material, baking paint and so on. The products are widely used in petrochemical industry, metallurgy, electric power, school communications, high-rise buildings and other fields, with beautiful appearance, strong corrosion resistance, versatility, flexible installation, complete varieties and other characteristics. In the "quality first, reputation first, management-oriented, sincere service," the purpose. In order to reduce weight, it is also possible to use aluminum alloy cables and FRP bridges. Their external dimensions and load characteristics are basically similar to those of steel bridges. Due to different proportions of aluminum and steel (Al=2.7, Fe=7.86, by weight, the ratio of aluminum to steel About 1:3, according to the market price of the two materials, the cost of the aluminum alloy bridge is 2.0 times higher than that of the similar galvanized steel bridge. The aluminum alloy bridge has the advantages of beautiful appearance, light weight and easy installation. Alloy bridges have been applied in some projects.
Bridge selection
1. In the engineering design, the layout of the bridge should be comprehensively compared based on factors such as economic rationality, technical feasibility, and operational safety in order to determine the best plan and fully meet the requirements for construction installation, maintenance and cable laying.
2. The height from the ground when the bridge is laid horizontally is generally not less than 2.5m, and the metal cover shall be added to the part less than 1.8m from the ground when it is laid vertically, except when it is laid in a special electric room. The cable bridge shall be laid horizontally on the equipment mezzanine or horse track and shall be less than 2.5m. Protective grounding measures shall be taken.
3. Bridges, trunkings and their hangers used in corrosive environments should be made of corrosion-resistant rigid materials. Or take anti-corrosion treatment, anti-corrosion treatment should meet the engineering environment and durability requirements. For places with high requirements for corrosion resistance or requiring cleanliness, aluminum alloy cable trays should be used.
4. In the section where there is a fireproof requirement, the bridge can be added in the cable ladder frame, tray with fire-resistant or flame-retardant properties, mesh, etc. to form a closed or semi-closed structure, and taken in the bridge and its hanger The surface is painted with a fireproof coating and other measures. Its overall fire resistance should meet the requirements of relevant national standards or standards. In places where the fire protection requirements are high, aluminum alloy cable trays should not be used.
5 need to shield the electromagnetic interference cable lines. If there is protection against external shadows, such as outdoor sunshine, oil, corrosive liquids, flammable dust, and other environmental requirements, non-porous tray type cable trays should be used.
6. In the places where dust can easily accumulate, the cable trays should be covered; in the public passages or outdoor cross-road sections, underlay bridges should be provided with a backing plate or non-porous trays.
7. Cables of different voltages and different purposes should not be laid in the same cable tray:
(1) Cables of 1 kV and above and 1 kV and below: (2) Dual-loop cables supplying the same path to the first-order load; (3) Cables for emergency lighting and other lighting: (4) Power, control and telecommunication cables. If different grades of cables are laid on the same cable tray, spacers should be added in the middle.
8. When the length of the steel straight section exceeds 30m, the aluminum alloy cable tray exceeds 15m, or when the cable tray passes through building expansion/contraction (sedimentation) joints, there should be O-30mm compensation margin, and the connection should adopt telescopic connection plates.
9. The choice of cable ladder, tray width and height shall meet the requirements of filling rate. The filling rate of cables in ladder frames and trays is generally 40%-50% for power cables and 50%-70% for control cables. . It is also advisable to set aside 10% to 25% of the project development margin.
10. When selecting the load level of the cable tray, the working uniform load of the cable tray shall not be greater than the rated uniform load of the selected cable tray load class. If the actual span of the cable tray hanger is not equal to 2m, then The work uniform load should meet: qG----in the work, uniform load, kN/m; qE----the rated uniform load, kN/m; LG---- actual span, m.
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bright blue. Deep purple or celadon powder. Soluble in hot water and cold water for blue, soluble in ethanol also to blue. The strong sulfuric acid to red light brown, for yellow to green after diluted, and then into a blue. The dye solution to join sodium hydroxide deep red light brown precipitation. Used for silk, wool dyeing, also used in bamboo, wood, printing paper and ordinary paper shading, is used to make organic pigments and solvent dye.
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