Products  〃〃  Lead Core Rubber Bearing (LRB)
1. Principle.
  Datong LRB lead core rubber bearings are seismic protection devices, which can reduce and limit the energy transferred from the
ground to the upper structures, especially in the events of earthquake. The reinforced plates and rubber provide the support for load of
the structure, while the rubber itself can also provide the isolation and deformation. Besides, the lead core inside can provide a higher

level of damping and dissipate the energy by heat under deformation.

2. Structure.

3. Application.
  Due to its simplicity and economy, LRB bearings are widely applied in numerous kinds of bridges, sky-scraping buildings and
steel structural constructions, especially in earthquake-prone areas. LRB bearings can work as normal elastomeric bearings in regular
days. Once earthquake comes, they will deform themselves and distribute heat to absorb and dissipate energy of the earthquake. After
earthquake, the bearings return to initial position due to their self-recovery performance of the rubber and lead.
4. Properties.
5. Raw Materials.
  Reinforcing plates, the top and bottom plates are made from steel grade Q235 or Q345 in accordance with ^AASHTO LRFD bridge
design specifications ̄ or CE1337 standard.

  Elastomeric materials are made from natural rubber, type ^NR ̄, grade3 as ASTM d4014-81.

  Lead with a minimum purity of 99%.
6. Fixing devices.
  LRB bearings are fixed by the anchor plates above and below though anchors and sockets to the lower and upper concrete

7. Corrosion prevention.

  LRB executes corrosion prevention systems according to EN ISO 12944. Specific corrosion work depends on its location,
environment, and the need of customers.
8. Handling, Storage, Installation and Maintenance.
  See the Handling, Storage, Installation and Maintenance chapter of bearings.
9. Inquiry.
  Quotations are welcomed with the following information:
  the vertical loads, including the maximum, permanent and the minimum, and the corresponding horizontal loads.
  maximum horizontal loads in the longitudinal and the transverse direction, and the related vertical loads.
  rotations in the longitudinal and transverse directions.
  the corresponding working drawing.
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