Quotes from manufacturers supplying prestressed plastic corrugated pipes for bridges in Dalian, Liaoning

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Raw materials for prestressed plastic corrugated pipes should be original granular raw materials. The use of powdered and reconstituted granular raw materials is strictly prohibited. High-density polyethylene () should meet the requirements of B/, and polypropylene should meet the requirements of B/. Appearance: The appearance of the prestressed plastic corrugated pipe should be smooth and uniform in color. The inner and outer walls are not allowed to have broken partitions, bubbles, cracks, hard lumps and scratches that affect use. Ring stiffness: The ring stiffness of the prestressed plastic bellows shall not be less than / Local lateral load: When the prestressed plastic bellows is subjected to lateral local loads, the surface of the pipe shall not be broken. The residual deformation of the pipe after unloading shall not exceed the outer diameter of the pipe. Flexibility: After the prestressed plastic corrugated pipe is repeatedly bent five times according to the prescribed bending method, and the special plug gauge can pass through the prestressed plastic corrugated pipe smoothly, the flexibility of the prestressed plastic corrugated pipe is qualified. Impact resistance: The maximum allowable value of vacuum impact rate R in the low-temperature drop weight impact test of prestressed plastic bellows is.
Under the same conditions, the friction coefficient of the reserved holes of the plastic corrugated pipe is significantly smaller than the friction coefficient of the reserved holes of the metal bellows, which reduces the friction loss of the prestressed force during the tensioning process. Generally, the friction coefficient of plastic corrugated pipes is ., while the friction coefficient of metal bellows is . Metal corrugated pipe, more suitable for vacuum grouting