Advantages of corrugated plastic pipes
Release time:
2020-04-09 13:56
Core Tip: After the hole is damaged as a material, the mud is the last protective barrier for the prestressed steel of the prestressed concrete structure. Plastic corrugated pipe is a new type of hole-making material. Compared with metal corrugated pipe, it has the following advantages: As the material of the hole, the mud is the last protective barrier for the prestressed steel of the prestressed concrete structure. Plastic corrugated pipe is a new type of hole-making material. Compared with metal corrugated pipe, it has the following advantages:
The material of the plastic corrugated pipe is HDPE. Its corrosion resistance is far better than that of metal, it is not afraid of acid and alkali corrosion, it itself is not corrosive, and it can effectively protect the tendon from corrosion. Many prestressed structures have suffered serious impacts, such as deicing for salt or brine. When the tension member is blocked or failed due to the collapse of the waterproof layer, microcracks and leaking drainage, the tendon is likely to have a corrosive effect. The grouting tendon in the "FIP Construction Guide (1990)" points out that permanent metal pipes do not have corrosion resistance enough to resist water leakage and reach the mud and tendons. The barrier protection provided by the corrugated plastic pipe is far better than that of the metal corrugated pipe as a tendon, which can prevent harmful substances from being polluted through the pipe, thus ensuring better durability of the post-tensioned structure;
Under the same conditions, the friction coefficient of the channel reserved by the SBG (B) plastic waveguide tube is significantly smaller than that of the channel reserved by the metal corrugated pipe, reducing the tension loss during the prestressing process. Generally, for highway bridges, the friction coefficient of the plastic corrugated pipe is 0.14, the friction coefficient of the metal corrugated pipe is 0.25 (0.2-0.25), and the coefficient of variation is 0.0015.
High-strength plastic corrugated pipe is not afraid of stepping on, not easy to vibrate, grip and disassemble, and has better sealing and anti-leakage performance than metal corrugated pipe, and is more suitable for vacuum grouting.
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