What are the characteristics of plastic bellows

1, high-density polyethylene is the raw material of plastic bellows. Its corrosion resistance is better than metal, not afraid of acid and alkali corrosion, no corrosion, and can effectively protect prestressed tendons from corrosion. It has the following characteristics:

Good corrosion resistance, anti-corrosion protection to improve the prestressed reinforcement.

2, good physical properties, non-conductive, can prevent stray current corrosion, good sealing, no rust; Under load, not soaked; High strength, high stiffness, impact resistance, not afraid of trampling.

Reduce the friction loss of prestressing during tension. Prestressed bridge bellows are plastic bellows, metal bellows, plastic bellows and galvanized bellows performance comparison. Galvanized corrugated pipe corrosion resistant polyethylene is a kind of common plastic with stable chemical properties, which is inert with Portland cement, no reaction, and never rusts. The galvanizing agent has good anti-rust performance, but the galvanizing layer is easy to precipitate hydrogen with alkali slurry. Concrete bonding has a bad effect on the strength of prestressed steel. The aging time of durable cement packaging under sealed conditions is up to 50 years. The general service life is about 5 years. The small bending radius of the circular tube with an inner diameter of 0.9-1.5(about 10-15 times the inner diameter or long and short axis) is more than 30 times. After the load action, the wall thickness of the concentrated load pipe is 1.5-2mm, the single ring layout, the stiffness is large, not afraid of stepping on the pressure, not easy to be pierced by the vibrator, the wall thickness of the pipe is 0.2mm-0.4mm, the spiral layout, the stiffness is relatively small, the pressure is easy to deform, and the vibrator can not contact the pressure seal tube of the bellows when pouring concrete. In the case of constant breakage, it can be constantly squeezed. It can squeeze and break constantly. Under pressure of 50 kg, under pressure of humidity, humidity and 20 kg, keep folding and biting for 24 hours without tube 0.2-0.4. If there is no pressure, water leaks, it will seep into the cement under pressure.

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