Lead rubber bearings (LRB ) for Bridge/Building Construction to Lebanon

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US $500-10,000 / Unit | 6 Unit/Units Lead rubber bearings (Min. Order)
Supply Ability:
1000000 Unit/Units per Month Lead rubber bearings
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Quick Details
Place of Origin:
Hebei, China (Mainland)
Brand Name:
Model Number:
Dimension 200-1200mm
Earthquake resistance for building and bridge
Polymer rubber materials
Rectangle and Circular
Packaging & Delivery
Packaging Details
In Pallets or Wooden Cases
Delivery Time


Contact information
Sales Manager:   Ms Jenny Lee
Mobile Phone:    +86-18678456530
Tel:                    86-318-8538202
Fax:                   86-0318-2210707

Skype:               dachengdc678
Website:            www.zqdcrubber.com
Company:          Zaoqiang Dacheng Rubber Co.,Ltd.



As a manufacturing company, we are not limited to the  ability of this, please contact us to get more informations.


1) Lead Rubber Bearing (Seismic Isolator)

    Seismic Isolator is installed as a Damping Equipment under building structures so as to control the


     tremor of structure against the loads of earthquake.


     Base Isolation System, which is a branch of manual technique to reduce the tremor of structure, is widely


     applied to the large sized structures such as road bridges, rail bridges and nuclear power station to


     minimize damages from dynamic loads like earthquake. Also because it has the economic and functional


     efficiency with comparative perfection, the Base Isolation System is studied and used in the world,


     especially in USA and Japan.



     So many bridges and buildings to which the Base Isolation System is applied are constructed in many


     countries including USA and Japan all over the world, and the constructed structures showed so high the


     function of isolation from earthquake that they proved the safety when arising the earthquake in practice.


     Also the installation of Earthquake Absorbing Bearing is likely to be required in the world in order to get


     the efficiency of seismic force damping function and of constructive cost down for the lower parts of






2) Special Features of Lead Rubber Bearing


     * Strong Points


     As it is made of vulcanized rubber layers, reinforced thin steel plates laid alternatively in the elastomeric pad, and


     one or several lead cores inserted through the elastomeric pad and top & bottom steel plate, Earthquake


     Absorbing Lead Rubber Bearing not only controls the volume of displacement with resisting the first horizontal


     loads, but also prevents the bridge from falling down with absorbing the second horizontal loads at the time of





      * Property of Lead as a Suitable Material for Earthquake Absorbing Work


     Lead is a suitable material used for earthquke absorbing work owing to the followings; first, as lead has a high


     malleability, it is able to be transformed from small to large range at a low temperature, second, the melting


     point of lead, it is 20°C, which is lower than other metal, makes it easily possible for lead to return to original


     molecular structure.


    * The Economic Design


    * The More Excellent Safety


    * Easy Installation




3) General Characters of Lead Rubber Bearing


A) Function & Applicable Bridge


  * Function


     The Earthquake Absorbing Lead Rubber Bearing is made so as to fulfill the earthquake absorbing function


     as well as general bridge bearings


  * Applicable Bridge


     This bearing is mainly applicable to small & medium bridge and not suitable for large bridge because of


     installation with a limit of dimensional height and volume according to the displacement moved from earthquake


     or impact load  So it's restricted on the scale of bridge.




B) Types of Lead Rubber Bearing


     Because of the earthquake absorbing function, this Lead Rubber Bearing is manufactured for free movement to


     all directions.




C) Mechanical Properties of Lead Rubber Bearing


     Earthquake Absorbing Lead Rubber Bearing shows following mechanical properties toward the loads of both


     in a short and long term.


     If Lead Rubber Bearing takes loads in a short term such as live loads from wind or earthquake on a little scale, it


     will control the tremor of structure by the action of reinforced steel plate, laminated rubber and the first stage of


     stiffness of lead, on the other side, if Lead Rubber Bearing takes loads in a long term such as live loads from the


     change of temperature or earthquake on a large scale, it not only shall control the tremor of structure but also


     ensure the safety of movement by the action of lead core which absorb the horizontally large energy after yield of


     lead core.


     The horizontal hysteresis properties are shown as a following hysteresis curve combined the elasticity of steel


     laminated rubber with the plastic transformation of lead core.



    D)Vertical load dependence

The vertical load on the lead rubber bearing varies when an earthquake occurs. Effect of the   vertical load on hysteresis loops over a range of σ=5,10, 15MPa was analyzed from the tests in section 3.2 and found to be very small. In Figure values of damping factor and stiffness normalized to σ=10MPa is shown. The ratio values at the shear strain of 100% were as follows: Heq(50)/Heq(100)=0.9, Heq(150)/Heq(100)=1.09; Kh(50)/Kh(100)=0.99, Kh(150)/Kh(100)=0.98.  






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