The Lifespan Genes of Rubber Pot Bearings
The lifespan of bridge bearings is like a person's lifespan; their inherent genes determine their foundation. Rubber pot bearings use a multi-layered steel plate and rubber composite structure. The rubber layer thickness is typically between 5-30mm. High-quality natural rubber can maintain its elasticity for over 20 years under normal operating conditions. However, temperatures above 60℃ accelerate aging, and temperatures below -40℃ may cause them to become brittle. Interestingly, the lifespan of the bearing is not calculated in years, but based on cumulative deformation-when the rubber layer's compression deformation exceeds 15%, replacement should be considered.
The Invisible Killer of the Environment
The enemy of bearings is never the weight of the vehicle, but those unseen threats:
Ultraviolet Radiation: Long-term exposure to sunlight can cause cracks on the rubber surface.
Ozone: The higher the ozone concentration in urban air, the faster the rubber ages.
Chemical Corrosion: De-icing agents and industrial waste gases can corrode the rubber molecular chains.
Water Immersion: Water accumulation can cause steel plates to rust and expand; actual tests show that long-term immersion in water can shorten the lifespan by 30%.
Three Secrets to Extending Lifespan
Want your bearings to serve for a few more years? Try these methods:
Regular check-ups: Use a rubber hardness tester; be alert if the hardness increases by more than 15 points.
Maintain ventilation: Include drainage holes in the design to prevent water accumulation and the formation of "rubber hot springs."
Sun protection measures: Install sunshades on the supports; this simple measure can reduce UV damage by 50%.
Dynamic monitoring: Install displacement sensors to monitor the deformation of the supports in real time.