Corrugated duct is an important part of the pre-stressed system as the hole-forming material of the pre-stressed post-tensioning method. For a long time, pre-stressed engineering has used pre-stressed metal bellows as the hole-forming material.

In order to overcome the shortcomings of pre-stressed metal bellows such as poor sealing, ease to damage, easy to rust, and high friction, and to provide an additional anti-corrosion barrier for the pre-stressed tendons, it is recommended to use a pre-stressed plastic duct made of polyethylene or polypropylene. By understanding the following performance indicators and characteristics of prestressed plastic ducts, we can better understand this prestressed product.

1. The pre-stressed hole forming system composed of pre-stressed plastic corrugated ducts and accessories should meet the needs of post-tensioned pre-stressed grouting; in addition to the heat welding connection between the pipe and the pipe, a special sealing connection device can also be provided; the entire hole is formed. The system is equipped with exhaust, drainage, and grouting pipes, which can meet the needs of pressure grouting or vacuum-assisted grouting.

2. The material performance of the prestressed plastic corrugated duct conforms to the regulations of CJ/T3078.

3. The inner and outer walls of the prestressed plastic duct are not allowed to have defects such as melt fracture, hard blocks, serious bubbles, etc., in order to achieve a small friction coefficient and ring stiffness, the prestressed plastic duct should be a pipe with a spaced ring waveform.

4. The prestressed plastic corrugated duct is equipped with a sealing device that can be reliably connected with the prestressed anchor.

5. The internal cross-sectional area of the prestressed plastic corrugated duct is at least 2.5 to 3 times that of the prestressed tendons.

6. The friction coefficient u of the prestressed plastic corrugated duct is 0.10~0.14, and k is 0.0008~0.0015.

7. The prestressed plastic corrugated duct has enough flexibility and abrasion resistance to facilitate the curve arrangement and prevent the rupture of the piercing and tensioning channels. The spacing of the positioning steel bars is recommended not to be greater than 0.8 meters, and the minimum bending radius is 0.9 to 1.5 meters.

1. The prestressed plastic corrugated duct is made of high-density polyethylene as the main raw material, which is corrosion-resistant, aging-resistant, rust-free, good sealing, no water seepage, and slurry phenomenon, which is beneficial to protect the steel strand.

2. It is non-conductive, which can prevent stray current from corroding.

3. Good airtightness and impermeability, more suitable for vacuum grouting.

4. High strength, high rigidity, good flexibility, not afraid of stepping on pressure, not easy to be broken by a vibrator.

5. Reduce the friction loss of the prestress during the tensioning process, and the friction coefficient is only 0.10~0.14.

6. The prestressed plastic corrugated duct has better fatigue resistance and can greatly improve the fatigue resistance of the components.

7. Large bendability and convenient connection can greatly improve construction efficiency.

There are two types of prestressed plastic corrugated ducts, around pipes, and flat pipes. Each form has a variety of specifications to meet the requirements of different specifications and forms of prestressed tendons such as steel bars, steel strands, and steel wires. The plastic corrugated duct designed and manufactured by CHUNPENG is produced with high-density polyethylene (HDPE) as the main raw material, which has good corrosion resistance and aging resistance. If you are interested, you can find out by searching related products.

As a professional manufacturer of prestressed concrete products, we have always been committed to providing customers with safe and high-quality products. We produce in strict accordance with the standards and have established a complete quality inspection system, which can control the quality of the products in an all-round way. At the same time, we can also provide thoughtful one-stop service and effective solutions according to customer needs. If you are interested in our metal corrugated ducts, please contact us immediately!