Anti-Seismic Device Lead Rubber Bearings High Damping Elastomeric Rubber Bearing

Product Description

    is a laminated elastomeric support with a lead core that carries vertical load and dissipates seismic energy. Natural rubber layers are bonded to steel plates, giving high vertical stiffness and low horizontal stiffness so the structure moves slowly during an earthquake. The lead plug yields and absorbs energy while the rubber body recentres the structure. They are used on highway bridges, railway bridges, building bases and retrofit projects.

Working Principle

 * Vertical load from the structure passes through the laminated rubber body.

 * Steel plates between rubber layers stop the unit bulging sideways under load.

 * The lead core yields in shear once ground shaking starts.

 * Yielding lead converts seismic energy into heat and reduces movement.

 * The rubber body recentres the structure after the shaking stops.

 * Horizontal stiffness stays low so the period of the structure lengthens.

Product Advantages

 * Laminated rubber and steel layers are produced to the project drawings.
 * Lead core gives energy dissipation as well as isolation in one unit.
 * The compound is formulated for ageing, ozone and weather resistance.
 * Low horizontal stiffness keeps forces on the pier well controlled.
 * Diameter, layer count and lead core are made to the design demand.
 * Units are protected for outdoor bridge and building exposure.

Specification

Material

Function

The bearing primarily uses Natural Rubber (NR) or specially formulated synthetic rubber (such as high-damping rubber). Internal thin steel plates serve as reinforcement skeletons to provide sufficient vertical stiffness and load-bearing capacity. Some models (e.g., lead-rubber bearings) incorporate a pure lead core plug at the center to offer higher damping and initial stiffness.

*Effective Seismic Isolation: Extends the structural period to avoid the predominant seismic period, significantly reducing the seismic response of the upper structure.

*Energy Absorption: Efficiently dissipates seismic energy through hysteretic deformation (plastic deformation of the lead core or internal friction of high-damping rubber).

Parameter Name	Unit	Specification Range
Damping Ratio	%	≥12
Load Capacity	kN	As per design requirement
Vertical Stiffness	kN/m	As per design requirement
Horizontal Stiffness	kN/m	As per design requirement
Vertical Compression Deformation	mm	≤10
Horizontal Deformation	mm	≤30
Durability	-	Fatigue life over 20 million cycles
Temperature Range	℃	-40 to +70

Detailed picture

Packing & Delivery

Company Profile

     Hengshui Jingtong Rubber Co., Ltd., located in Hebei Province's Hengshui City, is a professional manufacturer of engineering rubber products. Our product range includes bridge bearings, expansion joints, water stop strips, water stop belts, inflatable cores, building deformation joint device and water plugs, which are widely used in bridge, tunnel, water conservancy, and power engineering projects. The company boasts advanced technology and mature processes to ensure reliable product quality.

    We have a professional technical team and a comprehensive after-sales service system to ensure customers receive high-cost-performance products and attentive service. Hengshui Jingtong Rubber Co., Ltd. is committed to continuous innovation to meet market demands and looks forward to esta  blishing long-term cooperative relationships with customers from both domestic and international markets.

FAQ

Q1: What is a lead rubber bearing? 
A: It is a laminated rubber bearing with a lead core that damps earthquake energy.

Q2: How does the lead core work? 
A: The lead plug yields in shear during a quake and absorbs the input energy.

Q3: What is the difference from a plain rubber bearing? 
A: The lead core adds damping, so the bearing controls quake movement as well.

Q4: Where are these bearings used? 
A: Highway and railway bridges, seismic zone buildings, and viaducts.

Q5: Does the bearing return to its position? 
A: Yes -- rubber shear stiffness brings the structure back to line after a quake.

Q6: What temperature range does it serve? 
A: Service temperature is -40°C to +80°C.

Q7: How long does it last? 
A: Design life is over 50 years under normal structure service.

Q8: Can diameter and damping be customized? 
A: Yes -- diameter, layer design, and damping are set to the project.