Compared with Metal Bellows, Which one has More Advantages?
The raw material of the plastic corrugated pipe is HDPE, and it will not be corroded by some acids and alkalis. Of course, it is not corrosive by itself, and the metal corrugated pipe is more or less corrosive. Stress bars, that effect is very large. We know that slurry is the last protective barrier for steel in concrete structures.
Metal bellows metal pipes have no permanent anti-corrosion ability, which is not enough to resist water leakage and reach the slurry and tendons. The plastic corrugated pipe can provide a tendon with a barrier protection effect that is far superior to the metal corrugated pipe, and can prevent harmful substances from penetrating the pipeline for pollution, thereby ensuring that the post-tensioned structure has better durability.
The coefficient of friction of the plastic bellows is 0.14, and the coefficient of friction of the metal wave vacuum bellows is 0.25. It can be seen from the friction coefficient that the reserved channels of the plastic wave tube are significantly smaller than the reserved channels of the metal bellows, thereby reducing the friction loss during tensioning.
Plastic corrugated pipe has great advantages in addition to milk corrosion and small friction coefficient, and the strength of plastic corrugated pipe is very high. Don’t think that it is plastic, you can step on it. Don’t worry about it. The probability of breaking is also very low. Metal is a conductor, and plastic is non-conductive. If you don’t know it yet, elementary school will be in vain. Plastic bellows can prevent stray current corrosion without conducting electricity, and the anti-fatigue ability is naturally much better than conductive metal bellows.
Metal bellows. From the above aspects, the advantages of plastic bellows are stronger than metal bellows. Of course, the price of plastic bellows is still a little higher than that of metal. However, I think more engineering companies will still be willing to choose plastic bellows. As for why? I think what I have said is very clear.
We all know that metal bellows have a long history, but since the invention of plastic bellows, this material gradually replaced the original metal bellows and became the main material in people’s lives. Below we look at the comparative analysis of these two types of bellows.
The plastic corrugated pipe has good corrosion resistance and will not rust and deform due to external reasons. Metal corrugated pipes have no great advantage in this regard. Due to the nature of the metal, it is easy to rust in a humid environment and in high corrosion In the case of not too much resistance, so often it is not easy to use the problem, and it is necessary to repair or replace the bellows, which brings great inconvenience to our use.
