The load capacity of cable tray is determined by the load, the load of cable tray is divided into load, dynamic load and additional load. Static load refers to the type, number of cables laid in the cable tray and the outside diameter weight/unit length of each cable. Statistics are made according to different routes of cable laying.
Dynamic load refers to the weight of construction and maintenance personnel during the installation and maintenance of cable bridge. For light cable bridge, the dynamic load is generally not considered, that is, it is not allowed to stand (walk) on the bridge. Additional load only in outdoor refers to the load formed by snow, ice, wind and electromagnetic force, which is related to the local natural meteorological conditions of the installation site and the nature of charged body, and should be calculated according to various conditions in the design.
There are two important indexes to be considered when choosing steel cable tray: the bearing capacity of steel cable tray should meet the requirement of uniform load less than rated uniform load, and the cable tray should be able to adapt to different environmental requirements and have a long service life. At present, the common practice is: the bearing capacity of steel cable tray is satisfied by selecting the material of appropriate thickness; Environmental requirements and service life are met by selecting appropriate raw materials. In order to improve the carrying capacity of the cable tray, the plate thickness of the cable tray is generally increased. And environmental requirements is heavy corrosion environment generally choose key glass or aluminum alloy as the main body of the production of cable tray material, general corrosion environment generally choose steel material as the body of the production of cable tray, and the steel cable tray according to the bridge of the corrosion resistance level and adopt the hot dip galvanized, thermosetting powder electrostatic spray, spray paint, surface treatment, such as electric galvanized.