The role of prestressed Plastic Corrugated Duct

The role of prestressed Plastic Corrugated Duct

Summary

Prestressed corrugated ducts are mainly divided into metal corrugated ducts and plastic corrugated ducts. Mainly used in bridge engineering, it has the advantages of firm joints and no cracks. This paper mainly introduces the function of the prestressed corrugated duct.

Prestressed plastic corrugated duct is mainly divided into metal corrugated ducts and plastic corrugated ducts. Mainly used in bridge engineering, it has the advantages of firm joints, no cracks, no tripping, no water seepage, no slurry seepage, rotatable, large bearing capacity, etc. It is well received by users. This article mainly describes the role of the plastic corrugated duct.

The plastic corrugated duct is used as the hole data of the prestressed post-tensioning method. In order to overcome the shortcomings of poor sealing, easy damage, corrosion and high friction resistance of the plastic corrugated duct, and to provide an additional anti-corrosion barrier for the prestressed steel bars, it is recommended to use high-pressure polyethylene or polyethylene. 

The plastic corrugated pipe made of propylene is a revolutionary product with a post-tensioning method. The prestressed corrugated pipe produced by Jiaochuang Engineering has a long service life.

Specific advantages of prestressed plastic corrugated duct

1) The prestressed plastic corrugated pipe adopts high-pressure polyethylene (HDPE) as raw material and is produced by modern production technology. Its corrosion resistance is far superior to that of metal, and it is not afraid of acid and alkali corrosion. It does not corrode itself and can be reasonably The maintenance of the prestressed rebar will not corrode, thus ensuring greater durability of the post-tensioned construction.

2) The conflict coefficient of the pre-embedded channel of the prestressed plastic corrugated duct is significantly smaller than that of the pre-embedded channel of the plastic corrugated duct, which reduces the conflict loss of the prestress during the prestress tensioning process.

The conflict coefficient of the general prestressed plastic corrugated duct is 0.14, while the conflict coefficient of the plastic corrugated duct is 0.25. The prestressed plastic corrugated duct has high strength, is not afraid of being pressed, and is not easily broken by the vibrating rod. The anti-leakage function is higher than that of plastic corrugated ducts, and it is more suitable for vacuum grouting.

3) The prestressed plastic corrugated duct has good flexibility and high ring stiffness and is not afraid of stepping on it, and it is not easy to be broken by a tamper.

4) The prestressed plastic corrugated duct is non-conductive, which can avoid stray current corrosion, and metal is a good conductor of electricity.

5) Prestressed plastic corrugated ducts have stronger durability, which can greatly improve the fatigue resistance of prefabricated components.

The plastic corrugated duct is thus easy to handle since the plastic corrugated duct is light. 

However, it is necessary to pay attention to the straightness of the axis when installing. The acoustic impedance rate of the plastic corrugated pipe is relatively low, and it has a relatively large sound transmission rate when used as a plastic corrugated pipe. Usually, it can be used for small cast-in-place piles. The diameter of the pile needs to be filled with a large amount of concrete, and the hydration heat of the cement is not easy to dissipate.

Considering that the thermal expansion coefficient of the plastic corrugated duct is very different from that of the concrete after the concrete solidifies, the plastic pipe shrinks radially and longitudinally due to the temperature drop. , the plastic corrugated duct increases the multi-reflection interface on the sound path, which is easy to cause misjudgment.

The diameter of the prestressed plastic corrugated duct is usually larger than that of the radial transducer. In principle, there is no limit to the thickness of the pipe wall, but from the perspective of saving steel, the pipe wall needs to be able to withstand the lateral pressure of newly poured concrete. Usually thinner is more economical. Acoustic pulses are emitted from the transmitting transducer device by coupling the water to the interface of the water and the plastic corrugated duct tube wall.

Then, the interface between the plastic corrugated duct pipe wall and the concrete is reached through the pipe wall. After passing through the concrete, it needs to pass through two different interfaces of another plastic corrugated duct to reach the receiving transducer. 

Plastic corrugated pipe is good equipment. The plastic corrugated pipe has the characteristics of a thin pipe wall, low steel consumption, impermeability, good pressure resistance, and flexibility. It can usually be used for post-tensioning reserved holes in prestressed structures. The plastic corrugated pipe is directly tied to the steel skeleton, and a larger size corrugated pipe shall be used for socket connection at the joint.

The function of the prestressed corrugated duct has been introduced above. If you plan to buy a corrugated duct, welcome to contact us.

CHUNPENG is a professional custom pc steel strands and post-tensioned tubes manufacturer. Specializing in the production of post-tensioned tubes, pc strands, anchors, etc. With more than 30 years of production and export experience, Chunpeng has been a major partner in government projects, continuously providing customers with quality products that far exceed international standards. And provide comprehensive services to provide good solutions for prestressed construction projects.