What Is the Difference Between Plastic Corrugated Ducts and Metal Corrugated Ductes?

In engineering, the main function of prestressed corrugated ducts is to protect the steel strands from contamination when pouring concrete and ensure the quality of the tensioning. Prestressed corrugated ducts are divided into two types, metal one and plastic one.

When using metal corrugated ducts, corrosion resistance is the most troublesome problem for users. However, plastic corrugated ducts can improve this situation.

Compared with metal corrugated ducts, plastic has the following advantages:

1. Improve the corrosion resistance and anti-corrosion maintenance function of prestressed steel strands.

2. Good craftsmanship, no conductivity, can avoid stray current erosion, good sealing, no embroidery.

3. It has high compressive strength, great style, good impact resistance, does not penetrate under pressure, and is not afraid of being stepped on.

4. The friction damage of the prestressing force can be reduced during the whole tensioning process.

Plastic corrugated ducts combined with vacuum grouting provide a new technology for prestressed projects. The basic principle of vacuum grouting is to use a vacuum pump to evacuate the channel at one end of the channel to produce a vacuum degree of about -0.1MPa. Then use a grouting pump to pour the optimized special cement slurry from the other end of the tunnel until the entire tunnel is filled. And add a positive pressure of ≤0.7MPa to improve the fullness and compactness of the prestressed channel grouting.

The use of vacuum grouting technology can solve the current problems of ultra-long prestressed channel formation, insufficient prestressed tension extension and difficulty in filling the channel with grouting. For ultra-long tunnels, metal ducts have high friction and are prone to grout leakage and loose grouting during construction. Vacuum-assisted grouting uses a vacuum pump to first remove the air in the channels to achieve a negative pressure state in the channels, and then uses a grouting machine to inject cement slurry into the prestressed channels with positive pressure, which eliminates air bubbles in the channels and improves the fullness of the grouting in the channels.

plastic corrugated round duct

In engineering, the main function of prestressed corrugated ducts is to protect the steel strands from contamination when pouring concrete and ensure the quality of the tensioning. Prestressed corrugated ducts are divided into two types, metal one and plastic one.

When using metal corrugated ducts, corrosion resistance is the most troublesome problem for users. However, plastic corrugated ducts can improve this situation.

Compared with metal corrugated ducts, plastic has the following advantages:

1. Improve the corrosion resistance and anti-corrosion maintenance function of prestressed steel strands.

2. Good craftsmanship, no conductivity, can avoid stray current erosion, good sealing, no embroidery.

3. It has high compressive strength, great style, good impact resistance, does not penetrate under pressure, and is not afraid of being stepped on.

4. The friction damage of the prestressing force can be reduced during the whole tensioning process.

Plastic corrugated ducts combined with vacuum grouting provide a new technology for prestressed projects. The basic principle of vacuum grouting is to use a vacuum pump to evacuate the channel at one end of the channel to produce a vacuum degree of about -0.1MPa. Then use a grouting pump to pour the optimized special cement slurry from the other end of the tunnel until the entire tunnel is filled. And add a positive pressure of ≤0.7MPa to improve the fullness and compactness of the prestressed channel grouting.

The use of vacuum grouting technology can solve the current problems of ultra-long prestressed channel formation, insufficient prestressed tension extension and difficulty in filling the channel with grouting. For ultra-long tunnels, metal ducts have high friction and are prone to grout leakage and loose grouting during construction. Vacuum-assisted grouting uses a vacuum pump to first remove the air in the channels to achieve a negative pressure state in the channels, and then uses a grouting machine to inject cement slurry into the prestressed channels with positive pressure, which eliminates air bubbles in the channels and improves the fullness of the grouting in the channels.