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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.
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 |
Specification
- Shear modulus: 0.8 MPa, 1.0 MPa, 1.2 MPa.
- Working temperature range: -25 °C to +60 °C.
- Lead core quantity: single or multiple.
- Shape: rectangular and round.
Technical parameter
- Rectangular lead rubber bearing specifications.
- Round lead rubber bearing specifications.
| 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 | % | |
- Stable vertical stiffness and excellent vertical loading capacity.
- Suitable horizontal stiffness. Satisfy the earthquake vibration and normal displacement. It can enlarge the vibration cycle to 1.5 to 3 seconds.
- Excellent damping performance.
- Good energy dissipation capacity.
- Adjustable lead core area. It can suit different damping ratio through adjusting wire diameter and sectional area.
- Excellent durability, cycle fatigue resistance, acid and alkali resistance.
- Long lifespan. 60-80 years long lifespan for durability.
- Easy installation and replacement for lower maintenance costs.
Hengshui Jingtong Rubber Co., Ltd. is a comprehensive company engaged in water stop, waterproof materials, bridge building isolation materials, engineering rubber used in supporting projects such as highway bridges, tunnels, water conservancy, electric power, railway, etc. Relying on China Hengshui Rubber City Hengshui, the company has its own production capacity. It is a new rising show in the domestic engineering rubber industry, with advanced technology, mature technology and reliable quality.Jingtong rubber covers an area of 98000 square meters, with a building area of 45000 square meters. There are 20 professional senior technicians, and a diligent and dedicated management team. All employees provide high cost-effective engineering rubber products for new and old customers with scientific management, rigorous and realistic working attitude and honest and reliable service concept.The waterproof roll produced by the company has excellent performance, long service life, wide application range, safety,simplicity, high temperature resistance, 90 ºC does not flow, low temperature - 25 ºC does not embrittle. It can be used for waterproofing of buildings, basements, bridges, parking lots, roofs, gardens, swimming pools, reservoirs, tunnels and other projects of industrial and civil buildings. This product has good low temperature flexibility and elastic extension, especially suitable for buildings in high cold area. With high quality products and complete specifications, the company adheres to the working policy of high starting point, high standard, high quality and high efficiency, actively introduces technical talents and takes the road of prospering the factory through science and technology. The company strives for survival by quality, develops by prestige, and provides perfect after-sales service. We sincerely welcome friends from all walks of life. Now the company mainly produces and sells "HENGJINGGONG" brand building materials, including: Rubber / PVC / EVA waterstop, water swelling waterstop rubber, building sealant, butyl sealing tape, SBS modified asphalt waterproof roll, butyl waterproof roll, bridge building isolation bearing, bridge rubber bearing, plate rubber bearing (rubber pad), basin type rubber bearing, spherical bearing, bridge expansion device , bridge rubber inflatable core mold (hollow board air bag), rubber air bag (pipe stopper, rubber water bag) and other bridge engineering and waterproof engineering products.
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.
We are based in Hebei, China, start from 2013,sell to Domestic Market(40.00%),Southeast Asia(23.00%),Africa(16.00%),North America(7.00%),South America(7.00%),Western Europe(7.00%). There are total about 51-100 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Bridge Expansion Joint,Rubber Waterstop,Swelling Waterstop Strip,Seismic Isolation Bearing,Rubber Bearing Pad
4. why should you buy from us not from other suppliers?
1.More than 20 professional senior technical personnel.
2.There are 10 series,over 200 species and more than 2,000 specifications.
3.All products have been authenticated by the Ministry of Communications.
4.Self-research and development,professional.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FAS,CIP,FCA,CPT,DEQ,DDP,DDU,Express Delivery,DAF,DES;
Accepted Payment Currency:USD,CNY;
Accepted Payment Type: T/T,L/C,Credit Card,PayPal,Western Union,Cash,Escrow;
Language Spoken:English,Chinese
