Protective pipes should be installed in areas susceptible to external damage, such as cable entry and exit from buildings, tunnels, and channels. The inner diameter of the protective tube should not be less than 1.5 times the outer diameter of the cable, and the wall thickness of the tube should not be less than 2mm. The laying methods of protective pipes include exposed laying along brackets, cable trays, concealed laying, and buried laying. Cable conduit is suitable for telecommunications, power engineering, transportation, urban construction and other fields, especially in the field of buried power cable laying engineering, which has been widely used.