After Shaanxi to 洛桥梁 corrugated plastic pipe manufacturer 18,831,815,909 spot bellow as prestressed porogen Zhang hair is an important part of the prestressing system, tensioned concrete structure, into the hole after members applies. Prestressed plastic corrugated HDPE pipe is polyethylene as raw material once extruded plastic extruder, which overcome the past poor performance metal bellows seal, easy to damage, easy to rust, the characteristics of large friction resistance, is adhesion after tensioned revolutionary product that improves the life of prestressed concrete structures, but also for the tendons / reinforcement provides an extra layer of corrosion barrier. Prestressed plastic bellows compared with traditional metal bellows has obvious advantages: (1), has good corrosion resistance, improve corrosion protection tendons; (2), with good physical properties, non-conductive, may prevent stray current corrosion, good sealing performance, no rust; (3), under load, impermeable; high strength, stiffness, impact resistance, and are not afraid to step on the pressure; (4), prestressed plastic bellows Mount resistance coefficient u is 0.10 ~ 0.14, k take 0.0008 to 0.0015. It has enough flexibility and anti-friction properties, in order to prevent wear curve layout and beam, tension channel rupture, it is not recommended to locate rebar spacing greater than 0.8 m, the minimum bend radius of 0.9 to 1.5 meters. Reduce tension during prestressing friction losses.