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Structure of cable tray
Source: Release Time: 2016-07-19 14:25 2202 Views Size: 16px 14px 12px

Cable bridge load curve structure structure of trough cable bridge structure structure of combined cable bridge truss ladder structure and long-span bridge structure Selection of bridge 1.1 In the engineering design, the layout of the bridge should be comprehensively compared according to economic rationality, technical feasibility, operational safety and other factors to determine

Cable bridge load curve structure structure of trough cable bridge structure structure of combined cable bridge truss ladder structure and long-span bridge structure Selection of the bridge 1.1 In the engineering design, the layout of the bridge should be comprehensively compared according to economic rationality, technical feasibility, operational safety and other factors to determine the best solution, but also fully meet the construction and installation, maintenance and repair and cable laying Requirements. 1.2 The height of the bridge from the ground is generally not less than 2.5m when the bridge is laid horizontally, and a metal cover shall be added to protect the part below 1.8m from the ground when it is laid vertically, except when it is laid in an electrical room. The cable tray is laid horizontally on the equipment mezzanine or on the sidewalk and is less than 2.5m. Protective grounding measures shall be taken. 1.3 Bridges, trunkings, and their hangers are used in corrosive environments and should be made of corrosion-resistant rigid materials. Or adopt anti-corrosion treatment. The anti-corrosion treatment should meet the requirements of the engineering environment and durability. For places with high requirements for corrosion resistance or cleanliness, aluminum alloy cable trays should be used. 1.4 The bridge frame can be added to the cable ladder frame and tray with fire-resistant or flame-resistant plate, net and other materials to form a closed or semi-closed structure in the section with fire protection requirements. Paint the surface of the rack with fire-resistant coating and other measures. Its overall fire resistance should meet the requirements of relevant national codes or standards. In places with high fire protection requirements. Should not use aluminum alloy cable tray. 1.5 Cable lines that need to be shielded from electromagnetic interference. Or when there are environmental protection requirements such as outdoor sunlight, oil, corrosive liquids, flammable dust and other environmental requirements. Should choose non-perforated tray cable tray. 1.6 In places where dust is easy to accumulate, cover plates for cable bridges should be used; span road sections in public passages or outdoors. The bottom bridge should be added with pads or non-perforated trays. 1.7 Cables with different voltages and different uses should not be laid in the same layer of cable tray: (1) cables above 1kV and below 1kV: (2) dual-circuit cables that supply power to the primary load on the same path; (3) emergency Lighting and other lighting cables: (4) Power, control and telecommunications cables. If different grades of cables are laid on the same cable bridge, the partition should be added in the middle. 1.8 When the length of the steel straight section exceeds 30m and the aluminum alloy cable bridge exceeds 15m. Or, when the cable bridge passes through the building expansion (settling) joint, O-30mm compensation margin should be left. Its connection should use a telescopic connection plate. 1.9 The selection of cable ladder frame, tray width and height should meet the requirements of filling rate. Under normal circumstances, the filling rate of cables in the ladder frame and tray can be 40% -50% for power cables and 50% for control cables. 70%. It should also reserve 10%-252 project development margin. 1.10 When selecting the load level of the cable bridge, the working uniform load of the cable bridge should not be greater than the rated uniform load of the selected cable bridge load level. If the actual span of the support and hanger of the cable bridge is not equal to 2m. Then the work uniform load should meet: qG ---- work uniform load, kN / m; qE ---- rated uniform load, kN / m; LG ---- actual span, m. See Table 1 for the rated uniform load rating of the bridge. Table 1 Rated uniform load rating of steel cable trays Load rating ABCD Rated uniform load (kN / m) 0.5 1.5 2.0 2.5

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