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| Warranty: | 2 Years After Leaving The Factory |
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Lead rubber bearing, also called lead core rubber bearing, LNR rubber bearing, has similar structure with high damping rubber bearing. It is an important component of seismic isolation bearing. It is composed of laminated rubber bearing and lead core. The lead core can not only bear the heavy load and horizontal force, but also absorb energy through plastic deformation of hysteresis damping.
Lead rubber bearing can be divided into round and rectangular shapes for different application. Additional, the lead core quantity can be single or multiple to supply maximum flexibility in the bridges or building.
Working principle
The lead rubber bearing has same mechanical properties with laminated rubber bearing. Besides, it has high damping property.
As we all know, the laminated rubber bearing has large displacement deformation in horizontal direction.
In the earthquake, this structure can separate top and bottom structure vibration, enlarge self vibration cycle and reduce seismic force. Besides, the lead core will be squeezed and yielded during the shear process to dissipate Seismic force.
After the earthquake, the lead rubber bearing can help building restore the normal position through dynamic recovery and recrystallization of lead core and shear strain of laminated rubber bearing.
Performance comparison between lead rubber bearings and ordinary rubber bearings
There are significant differences in damping performance between lead rubber bearings and ordinary rubber bearings. The damping coefficient of the former typically exceeds 15%, while that of the latter is generally below 5%. This excellent damping property allows lead rubber bearings to effectively extend the structural period of bridges and significantly reduce the acceleration response of the superstructure. Under seismic action, lead rubber bearings can significantly improve the stress state of the structure during the earthquake due to their unique mechanical properties, making them particularly suitable for being set in areas with a seismic intensity of 8 degrees or higher.
| I Type | Connector plate connect to top surface plate by bolts Rubber cover layer bond to internal plate |
| Rubber elastomer layer cover all bearing after vulcanization | |
| II Type | Connector plate bond to internal elastomer |
| III Type | Bearing connected to connector plate by groove or dowel |
| No | Test Item | Technology Requirement | Unit | |
| 1 | Hardness (Shore A) | 60±5 | HD | |
| 2 | Tensile Strength | ≥ 18 | MPa | |
| 3 | Elongation At Break | ≥ 550 | % | |
| 4 | Compression Set | 709 °C × 24 H | ≤ 30 | % |
| 5 | Brittleness Temperature | ≤ -50 | °C | |
| 6 | Ozone Aging(50 PPHM, 20% Elongation, 40 °C × 48 H) | No Creak | - | |
| 7 | Air Aging | Hardness Change (Shore A) | ≤ +6 | HD |
| Tensile Strength Chang Rate | ≤ 12 | % | ||
| - | Elongation At Break Chang Rate | ≤ 20 | % | |
Our Adnantages
1. Advanced and Sufficient equipment More than 100 sets of most advanced equipment in our workshop ensure timely delivery time for large orders. Additional, it can ensure standardized production, which accord with international standard.
2. Experienced and skilled worker team Equipped with professional production skills and several years experience, our worker team can improve production efficiency and reduce production losses for cost reduction.
3. Multiple models for completed products We have almost all of standard bearing pad models to produce standard bearing pads, including pot bearing, laminated bearing pad, spherical bridge bearing, high damping rubber bearing and lead rubber bearings.
4. Perfect Package & Timely delivery All the products are inspected before loading, then they will be perfectly packed. Then our skilled loading team will operate the equipment for easy and fast loading.
5. Professional sales team Full knowledge of bearing pad products, good spoken and written English and excellent communication skills can offer you the best solutions to your questions. You can ask for recommendation, customized service and any other information you want from them.
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