V纶 cable pipes with polished inner surfaces and inner spraying, through improvements in material composition and production processes, enhance the smoothness of the pipe inner wall and reduce friction resistance. The coefficient of friction is less than 0.3, significantly lower than that of other types of cable pipes, allowing the cable pulling length during installation to be increased to 100-130 meters, thereby reducing the need for manholes and lowering construction costs and labor intensity. Inner polishing involves using high-speed polishing equipment to create a dense, smooth surface on the hard pipe inner wall. Inner spraying, on the other hand, applies a layer of graphite emulsion lubricant evenly on the inner wall of the pipe using a coating machine. This technology has been widely used in underground cable projects internationally.