the aluminum alloy bridge is self-developed by our company with reference to the American NEMA standard NEMA VEI-1979 "CABLE TRAYS". It has the advantages of simple structure, novel style, corrosion resistance, long service life, convenient installation and maintenance, and no need for maintenance. It can be applied to a wide range of environmental conditions. It can be used in coastal salt fog areas, high temperature, high humidity and corrosive environments, and can show its corrosion resistance.