Prestressing Method

Install a set of tensioning devices under the cable tray. The Galvanized cable tray forms an arch under the tension of the tensioning tendons. This generates compression on the lower cover plate of the tray and tension on the upper cover plate. This force is opposite to the stress caused by external loads, offsetting part of the working force and improving the stress state of the tray. Therefore, the prestressing method aims to reinforce the tray and correct deflection. It is simple and easy to control, but has limitations: electric ball valves are not easy to calibrate, and the tray deformation is complex.

Flame Straightening Method

The flame straightening method involves heating specific parts of the cable tray. Heated components expand but are restricted by adjacent unheated parts and cannot expand freely, resulting in compression of the heated areas. After cooling, contraction occurs again. During the cooling process of the heated parts, the surrounding metal is pulled closely together, generating contraction forces equivalent to eccentric moments acting under the tray and its neutral layer. This restores the tray's curved surface and achieves the purpose of correcting structural deformation. The flame straightening method offers great flexibility and can correct various complex deformations of the tray structure.

Galvanized Cable Trays

There are numerous anti-corrosion technologies for cable trays. Surface protection treatments via coatings can be divided into three types: metallic, organic, and inorganic. Thick metallic layers can be applied through electroplating, powder plating, hot-dip galvanizing, solution spraying, metal cladding, etc. In addition to ordinary zinc materials, various combinations such as zinc alloys, aluminum alloys, and stainless steel are also used.

Anti-Corrosion Surface Treatment Technologies

Powder-coated cable trays and Hot-Dip Galvanized Cable Trays: Tempering furnaces have strict requirements for harsh corrosive environments and high durability. Therefore, it is appropriate to explore surface protection treatment methods.

Galvanizing is very similar to hot-dip galvanizing in appearance. The hot-dip galvanizing process involves removing the existing zinc layer (if any) followed by hot-dip galvanizing. Compared with hot-dip galvanizing (note: original text may refer to electrogalvanizing here), this process is simpler.