Elastomeric Bearing Pad Specifications
| Material: | NR or CR |
|---|---|
| Hardness: | 60±5 ShoreA |
| Tensile Strength: | 10Mpa MIN |
| Elongation at Break: | 300% MIN |
| Compressive Deformation: | 30Max |
| Ozone Aging 40℃×96h: | No Cracking |
| Shape: | Round or Rectangular |
| Packing: | Bag,Box,Pallet |
Elastomeric Bridge Bearing Materia
The elastomer used during the manufacturing of Elastomeric bridge Bearing should be either natural or synthetic rubber(Chloroprene Rubber), which has excellent physical properties and can also retain properties at lower temperatures.
Bridge bearing types
GBZJ Rectangular Elastomeric Bearing has the advantages of simple maintenance and easy replacement, and has been widely used in bridge construction, hydropower engineering, and earthquake-resistant facilities of houses.
GBZY Round Elastomeric Bearing with simple structure, easy installation; saves steel and low price was widely used in bridge construction, hydropower engineering, and earthquake-resistant facilities of houses.
Grid Rubber Bearing made of rubber layer and laminated steel Plate,with four houles in surface, shape can be round and rectangular.Various sizes can produce as project requirements.
Rectangular PTFE Bearing makes of elastomeric bearing pad with a top layer of 1.5mm-3mm thick PTFE.It is particularly suitable for bridges with medium and small loads and large displacements.
The low friction coefficient of the PTFE plate allows the beam end to slide freely on the surface of the PTFE plate, and the horizontal displacement is not restricted.
Elastomeric Rubber Pad made of multiple layers of rubber sheets bonded by vulcanization with a good elasticity to cope with the rotation of the beam end of the bridge.
- Bearing Capacity
- Product Parameter
Factors determining the bearing capacity of elastomeric bearing
The bearing capacity of elastomeric bearing on the following three situations:
(1) The rubber itself is crushed or sheared;
(2) The rubber produces compression deformation and shear deformation that exceeds the allowable use;
(3) When under compression, the support (concrete, steel plate or other) is pulled apart by the outward reverse horizontal shear force of the rubber, or when sheared, the contact surface between the support and the rubber slips off each other.
Elastomeric Bridge Bearing Advanced Manufacturer Line
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Features of Elastomeric Bridge Bearing
* Capable to withstand severe vertical loads and external forces.
* High accommodation of movements caused by expansion, contraction, concrete creep effects and shrinkage, etc.
* Allow for rotations of the bearing in any horizontal axis caused by deflections or misalignments.
* Absorb vibrations and isolate sounds.
* Great traction resistance.
* Corrosion free in that the steel plates are embedded in the rubber without contact of air.
* Easy to install.
Application of Elastomeric Bridge Bearing
1. Ordinary bridge rubber bearings are suitable for bridges with a span of less than 30m and small displacement.Orthogonal bridges use rectangular bearings; curved bridges, oblique bridges and cylindrical pier bridges use circular bearings.
2. PTFE plate bridge rubber bearings are suitable for large-displacement bridges with large spans, multi-span continuous, simply supported beam continuous plates and other structures. It can also be used as a slider in the top push of continuous beams and the transverse movement of T-beams. The application of rectangular and circular PTFE plate rubber bearings is the same as that of rectangular and circular ordinary plate rubber bearings.
3. Elastomeric bearing pads is made of multiple layers of rubber sheets and thin steel plates inlaid, bonded and pressed. It has good elasticity to adapt to the rotation of the beam end, and has large shear deformation to meet the horizontal displacement of the upper structure.
Elastomeric Bridge Bearing Packing
Packing of Elastomeric Bridge Bearing usually in bag, in wooden box, on pallet or as client’s requirements.
Hengshui Lu Chen New Material Technology Co., LTD.
We are a professional manufacturer and exporter that is concerned with the design, development and production of elastomeric bearing.
All of our products comply with international quality standards and are greatly appreciated in a variety of different markets throughout the world.
Type A: Plain pad/Strip bearings
Type B: Laminated bearings
Type C: Laminated bearings with thicker end laminates
Type D: Laminated bearings with thicker end laminates exposed
Type E: Bearings with separate steel plate directly vulcanized with the bearing
Type F: Bearings with positive anchorage
Type G: Bearings with PTFE bonded to the elastomer
Type H: Bearings with sliding interface
Type I: Bearings with restraint against translation to simulate support condition
As per the bearing design, the internal elastomer layer thickness varies between 8-20mm for laminated bearing.
Usage of internal layer thickness up to 25mm is acceptable under particular situations.
The minimum thickness of inner reinforcing steel plates shall be 3mm.
The typical standard size of elastomeric bearings of type B and laminated Bearings as per R’20 series should be as per IRC:83-2018, Annexure B.
For laminated elastomeric bearings, it is permissible to reduce the loaded area, without changing the plan dimensions, by providing holes of uniform sections in the loaded area.
The minimum thickness of the top and bottom elastomer cover layer should be 2.5mm, and the minimum thickness of the side cover shall be 4.0mm.
Elastomeric bridge bearings shall be designed as per the Ultimate Limit State method. At the ultimate limit state, the strength and stability of elastomeric bearings shall be sufficient to resist the ultimate design load and movements of the structure.
Elastomers stiffen at low temperatures; therefore, choosing a suitable compound is necessary considering the environmental conditions at the bridge location.
Typical bridge bearings are either plain neoprene pads or reinforced with horizontal steel laminates. The stiffness and flexibility of elastomeric bridge bearings are well maintained using steel plates and rubber.
The reinforcing steel plates are bonded with rubber, which helps to restrict the bulging of the elastomeric bridge bearing.
The reinforcement increases the compressive and rotational stiffness and controls the vertical deflection and rotation of the elastomeric bridge bearing.
The grade of reinforcing mild steel laminates should be as per IS: 2062 or IS: 1079, and the yield stress of the laminates not less than 250Mpa.
The shearing deformation of the neoprene pads allows the horizontal movement of elastomeric bridge bearing.
The properties of the test piece to be tested are listed below.
Composition
Tensile Strength
Elongation at Break
Tear Resistance
Compression Set
Accelerated Ageing
Ozone Resistance
Adhesion Strength
Specific gravity: ± 0.2
Ash content: ± 0.5%
Hardness