Ruida Lead core rubber bearing for bridge seismic isolation construction elastomeric & laminated teflon bearing pad
LRB lead rubber bearings work on the principle of base isolation and limits the energy transferred from the ground to the structure in the event of an earthquake. Lead Rubber Bearings (LRB) consists of a laminated rubber and steel bearing with steel flange plates for mounting to the structure. All isolators have an energy dissipating lead core. The rubber in the isolator acts as a spring. It is very soft laterally but very stiff vertically. The high vertical stiffness is achieved by having thin layers of rubber reinforced by steel shims. These two characteristics allow the isolator to move laterally with relatively low stiffness yet carry significant axial load due to their high vertical stiffness. The lead core provides damping by deforming plastically when the isolator moves laterally in an earthquake.
The damping coefficient of plain elastomeric bearing is less than 5%, while the lead rubber bearing is more than 15%. During the earthquake, the lead rubber bearing can increasingly reduce the accelerated speed and uniformly change the large force of the bridge superstructure, thus, lead rubber bearing has better seismic function.
- High purity lead. The lead core in the lead rubber bearing that we adopt is high purity and does not contain any impurities.
- Excellent seismic function. Lead core in the bridge bearing has high level damping of up to 30% by deforming plastically when the bearing moves laterally in an earthquake.
- Corrosion resistance. The steel plate are fully embedded in the rubber and sealed.
- Aging resistance. Rubber layer is coated on the surface of the bearing surface to protect the inner rubber.
- Strong recovery ability. When subjected to large displacement, lead rubber bearings with large ductility will have no residual deformation and can restore by itself.
- Practical function. Lead rubber bearing not only controls the displacement volume but also prevents the bridge from falling down.
- Easy maintenance. Available with additional anchor plates, the bearing can be easily removing for maintenance purpose.
| Item/Rubber Type | Neoprene | Natural Rubber | EPDM | |
|---|---|---|---|---|
| Hardness (shore A) | 60 ± 5 | 60 ± 5 | 60 ± 5 | |
| Tensile Strength | ≥17.0 | ≥17.5 | ≥15.2 | |
| Elongation at Break | ≥400% | ≥400% | ≥350% | |
| Brittleness Temperature | ≤-40 °C | ≤-50 °C | ≤-60 °C | |
| Constant EN Compression Set(70 °C, 22 h) | ≤20% | ≤25% | ≤25% | |
| Resistance of Ozone Aging(Test Condition: 25–50 pphm, 20% Elongation, 40 °C, 96 h) | no cracking | no cracking | no cracking | |
| Air Oven Aging Test | Test Condition(°C × h) | 100 × 70 | 70 × 168 | 100 × 70 |
| Reduction Rate of Tensile Strength | <15% | <15% | <15% | |
| Reduction Rate of Elongation at Break | <40% | <20% | <40% | |
| Change of Hardness | <+15 | <+10 | <+10 | |
During the earthquake, the un-isolated building will vibrate back and forth in varying directions due to the inertial forces and result in deformation and damages of the building. In contrast, the base isolated building will also displace but remains its original shapes and avoid damages - that is because the lead rubber bearing effectively dissipates the inertial force upon the building, extends the building’s period of vibration and decrease the acceleration of the building.
The lead plug will slid with laminated rubber during earthquake but convert this energy of movement to heat so that it efficiently reduces the inertial force upon the building, which slow the vibration of the building. Meanwhile, the rubber part will preserve its original shape due to high elasticity.
Packed in bags and then on pallet .
Shipping usually by sea. We will arrange delivery whinin 7 day after payment.
Q1. Are you a manufacturer or trading company?
A: Yes, We are factory, we can guarantee our price is first-hand, competitive price and High quality. Thanks!
Q2. Could you accept OEM and ODM?
A: Yes, sure. We have very rich experience in OEM & ODM service in passed 15 years, the object many including worldwide famous brands. cusomized logo as your request. Thanks!
Q3. Are the samples acceptable and MOQ?
A: Yes, Accepted. You can get detail info from salesman as the different products. Thanks!
Q4. Can I get the better price?
A: We are always trying to provide the best prices to faithful customers. Thanks!
Q4. What is the lead time?
A: Sample Order: 1-7days after receipt of the full payment.
OEM Order: 15-30days after receipt of the deposit.
Q5 How can I get some samples?
A: We can provide you the samples but need you to pay the charges.
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