PVC -u reinforced pipe is made from PVC resin by heating, the use of special tooling and molding process in the production of a new type of PVC -u pipe again. As a new generation of drainage discharge pipes, PVC -u reinforced pipe is the product of high and new technology development in the early 1990 s. Characterized by a thin wall thickness reduction, but also improves the ability of steel tubes under external pressure load. The outer wall of the pipe with radial stiffeners, so as to improve the ring stiffness of the pipe. The pipe under the same external pressure load capacity, than ordinary PVC -u solid wall pipe can save about 30% of the material, the impact strength and improve. With its material, wall smooth, product light and other characteristics, widely used in the western developed countries, gradually take the place of municipal drainage sewage in the city for a long time of concrete pipe. In our country has been in Shanghai from Canada to introduce the pipe production technology and equipment, can produce 6 ~ 500 mm PVC -u reinforced pipe, used in residential construction and municipal construction project.