Prestressed plastic corrugated pipe is a new material into the hole, compared with prestressed corrugated metal pipe, it has the following advantages: 1. prestressed corrugated plastic pipe made of high density polyethylene (HDPE) as raw materials and advanced production technology a. It is far superior to metal corrosion resistance, not afraid of acid, alkali corrosion, which itself does not corrode, can effectively protect tendons from corrosion. Many of prestressed structures suffer serious effects outside, de-icing salt or brine. Prestressed corrugated plastic pipe can provide a far superior barrier protection metal bellows for tendons, to prevent contamination of harmful substances through the pipeline, thus ensuring the post-tensioned structure has better durability. Under the same conditions 2, prestressed plastic bellows reserved channels is significantly less than the friction coefficient of metal bellows reserved channel coefficient of friction, reducing the tension during the prestressing of friction losses. General prestressed plastic corrugated pipe friction coefficient is 0.14, and the coefficient of friction of metal bellows is 0.25; high strength prestressed plastic bellows, not afraid to step on the pressure, can not easily be broken chisel vibrator, sealing performance and impermeability performance than metal bellows, more suitable for vacuum filling; 3. prestressed plastic corrugated pipe is flexible, high ring stiffness, not afraid to step on the pressure, can not easily be broken tamper chisel. 4. prestressed plastic corrugated pipe is not conductive, can prevent stray current corrosion, while the metal is a good conductor of electricity; 5. prestressed plastic corrugated pipe has better stamina performance, can greatly improve the fatigue resistance member. Comply with the technical requirements of the transportation industry standard JT / T529--2004 corrugated plastic pipe materials should use the original granular materials. Do not use powdered and recycled granule-like materials. High-density polyethylene (HDPE) shall meet the requirements of GB / T11116, and polypropylene (PP) should meet the requirements of GB / T18742.1 of.