Beam prestressed bellows Prestressed plastic bellows
The raw material of plastic bellows is high-density polyethylene. It does not corrode itself, but its corrosion resistance and aging resistance are far better than those of metal materials. A large number of domestic cable-stayed bridges The cable outer sheath is the best proof. This provides a barrier protection function for the prestressed tendons that is far superior to that of metal corrugated pipes, has good sealing and impermeability properties, and is more suitable for vacuum grouting.
Technical requirements
Comply with transportation industry standards
Materials The 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 shall meet the requirements of /, and polypropylene shall meet the requirements of /.
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, or scratches that would affect use.
Stiffness: The stiffness of the ring of prestressed plastic bellows shall not be less than
When the prestressed plastic bellows is subjected to a local transverse load, the surface of the pipe shall not be cracked. The residual deformation of the pipe after unloading shall not exceed the outer diameter of the pipe. .
After the tough prestressed plastic corrugated pipe is repeatedly bent five times according to the prescribed bending method, if the special plug gauge can pass through the prestressed plastic corrugated pipe smoothly, the flexibility of the prestressed plastic corrugated pipe is qualified.
The maximum allowable value of vacuum impact rate for the low-temperature drop weight impact test of impact prestressed plastic bellows is.
Detailed introduction and price of prestressed plastic corrugated pipes in Shaoxing, Zhejiang 15933187015