prestressed plastic corrugated pipe raw material is HDPE. Its corrosion resistance is much better than the metal, not afraid of acid, alkali corrosion, it is not corrosion, can effectively protect of the prestressed steel from corrosion. A lot of prestressed structure under the serious influence, such as deicing salt or salt water. When after component due to the collapse of the waterproof layer, micro fissure water and drainage facilities of blocking or fails, prestressed reinforcement will likely from corrosion. The guide (FIP construction 1990). 'Prestressed grouting' pointed out that in tube is no permanent anti-corrosion ability, enough to resist water leakage and reach the slurry and the prestressed reinforcement. Prestressed plastic bellows for prestressed concrete to provide a is much better than the metal corrugated pipe barrier protection, can prevent the pollution of harmful substances through the pipe, thus ensure the post-tensioned prestressing

stress structure has better durability; Prestressed plastic corrugated pipe is HDPE as raw materials, is a new type of pore forming material. Prestressed plastic corrugated pipe is mainly used in post-tensioned prestressed concrete structure, the rod into the hole, has good sealing, no water seepage leakage blade, high ring stiffness, low friction parameters, ageing resistance, resistance to invasion

corrosion, good soft stretch, not easy to be tamper demolition is linked with the new connection way makes the construction more convenient. As porous materials by corruption, the blade body is prestressed steel in prestressed concrete structures of the

after a protective barrier.