Tray type bridge is the full name of the rigid structure system with closely connected supporting cables, which is composed of straight sections, bends, components of trays or ladders, brackets (arm supports), hangers, etc. Let's follow the Shandong cable tray manufacturers to understand the key points of the selection of tray type cable tray products.
Cable trays, trunking and their supports and hangers used in corrosive environment shall be made of corrosion-resistant rigid materials or treated with anti-corrosion treatment. The anti-corrosion treatment method shall meet the requirements of engineering environment and durability.
In the section with fire protection requirements, the cable tray can be added with plates, nets and other materials with fire-resistant or flame-retardant properties in the cable ladder and tray to form a closed or semi closed structure, and measures such as painting fire-resistant coating on the surface of the cable tray and its supports and hangers shall be taken. The overall fire resistance performance shall meet the requirements of relevant national codes or standards.
In places with high fire protection requirements, aluminum alloy cable trays should not be used.
The width and height of cable ladder and tray shall meet the requirements of filling rate. Generally, the filling rate of cable ladder and tray is 50% ~ 70% for power cable and 50% ~ 25% for control cable, and 10% ~ 25% for project development should be reserved.
When selecting the load grade 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 grade. If the actual span of the supports and hangers of the cable tray is not equal to 2m, the working uniform load shall meet the requirements.
Under the condition that various components and supports and hangers meet the corresponding loads, their specifications and dimensions shall match with the straight section and bend series of trays and ladders.
When selecting the bend through or lead-in and lead-down devices of the cable tray, it shall not be less than the small allowable bending radius of the cable in the cable tray.
For steel cable trays with a span of more than 6m and aluminum alloy cable trays with a span of more than 2m or a bearing requirement greater than the load grade D, the strength, rigidity and stability shall be calculated or tested according to the engineering conditions.
The key points for selection of tray type bridge products are as follows. You can use them as a reference. Of course, you should pay more attention to matters before and after use. For more information, please visit our website http://www.sddlqj.cn Consult and understand.