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| elastomeric bearing pad |
Dacheng Elastomeric Bearing Assemblies are custom molded using neoprene or natural rubber and are categorized into three basic designs:
laminated elastomeric bearing pads,
PTFE sliding bearing pads.
and plain elastomeric bearing pads
Elastomeric Laminated Bearing Pad
Dacheng elastomeric laminated bearing pads with simple reinforcement are made up of
multiple elastomer layers separated by reinforcing steel plates ,sulfurized and moulded
together.can be manufactured in a rectangular or circular shape to meet individual
engineering requirements. General laminated bearings suits to bridges with span less than
30m and small displacement.Different flat shape suits to different bridge span structures :
orthogonal bridges adopt rectangular bearing;curvilinear bridges,oblique crossing bridges
and cylindrical pier bridges adopt circular bearing.
multiple elastomer layers separated by reinforcing steel plates ,sulfurized and moulded
together.can be manufactured in a rectangular or circular shape to meet individual
engineering requirements. General laminated bearings suits to bridges with span less than
30m and small displacement.Different flat shape suits to different bridge span structures :
orthogonal bridges adopt rectangular bearing;curvilinear bridges,oblique crossing bridges
and cylindrical pier bridges adopt circular bearing.
PTFE Sliding Elastomeric Bearing Pad
Laminated elastomeric bearings with PTFE sheet bonded on the elastomer:a virgin PTFE layer is bonded to the elastomer to reduce the friction coefficient with the stainless steel welded to the top steel plate. Tetrafluoro plate type rubber bearing suits to bridges with large span,several spans in continuous,with simply supported beam and continuous plates structure,and large displacement.It can still used as the sliding block in purchasing of continuours beam and cross sliding of T-shape beam.
The application of rectangular and circular tetrafluoro plate type rubber bearings are the same with rectangular and circular general plate type rubber bearing,separately.
Non-Reinforced Elastomeric Bearing Pad
Non-Reinforced ElastomericBearing Pads can be used in many construction and civil engineeringapplications to support concrete and steel structures, and where a simple, lowcost rubber separation strip is capable of carrying compressive loads, while at the same time providing translational movement and rotational capacity. Plain pad bearings have a large and varied range of possible applications though these bearings are more typically used in prefabricated structures.
Materials: EPDM,natural rubber or neoprene
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| elastomeric bearing pad |
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| elastomeric bearing pad |
DEFINITIONS
For the purpose of this specification the following definitions apply:
Effective Elastomer Thickness (Te ): means the sum of the thickness of all layers of elastomer
For the purpose of this specification the following definitions apply:
Effective Elastomer Thickness (Te ): means the sum of the thickness of all layers of elastomer
which have a shape factor not greater than twelve.
Elastomer: means a compound containing virgin natural polyisoprene (natural rubber) or virgin
Elastomer: means a compound containing virgin natural polyisoprene (natural rubber) or virgin
polychloroprene (neoprene).
Shape Factor: means the area of the loaded face of an elastomeric layer divided by the area free to
Shape Factor: means the area of the loaded face of an elastomeric layer divided by the area free to
bulge.
Plain Bearing: means a bearing which consists wholly of elastomer.
Laminated Bearing: means a bearing composed of elastomer laminates separated by and fully
Plain Bearing: means a bearing which consists wholly of elastomer.
Laminated Bearing: means a bearing composed of elastomer laminates separated by and fully
bonded to steel plates.
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| elastomeric bearing pad |
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| bridge bearing pad |
Elastomer Thickness
The thickness of the elastomer, Te, for plain bearings shall not be less than 15 mm and not more than 25 mm.
The thickness of the elastomer, Te, for plain bearings shall not be less than 15 mm and not more than 25 mm.
MATERIALS:
All material shall be unused with no reclaimed material incorporated in the finished bearing.
Internal steel plates for laminated bearings shall be rolled mild steel with a minimum yield strength of 230 MPa.
PRODUCTION
Plain Bearings
Plain bearing pads shall be moulded individually, cut from previously moulded strips or slabs of the
Plain Bearings
Plain bearing pads shall be moulded individually, cut from previously moulded strips or slabs of the
required thickness, or extruded and cut to length.
Laminated Bearings
Laminated bearings shall be moulded as a single unit under pressure and heat in moulds which shall
have a smooth surface finish.
Steel plates shall conform to the following:
1. All steel plates shall be of uniform thickness.
2. Internal steel plates shall be free from sharp edges.
3. Steel plates shall be completely bonded on all surfaces to the elastomeric material during moulding. The cover on the edges and top and bottom surfaces shall be 5 mm except that no cover is required
Steel plates shall conform to the following:
1. All steel plates shall be of uniform thickness.
2. Internal steel plates shall be free from sharp edges.
3. Steel plates shall be completely bonded on all surfaces to the elastomeric material during moulding. The cover on the edges and top and bottom surfaces shall be 5 mm except that no cover is required
over pintle holes.
4. Where pintles are specified, the depth of pintle holes shall be such as to fully engage only one steel plate.
Elastomer laminates shall be of uniform thickness.
4. Where pintles are specified, the depth of pintle holes shall be such as to fully engage only one steel plate.
Elastomer laminates shall be of uniform thickness.
Shear Deformation of Plain and Laminated Bearings
The shear resistance of bearings shall not exceed 250 kPa for polyisoprene or 350 kPa for
polychloroprene bearings, when tested as follows:
a. The bearings shall be conditioned at -25°C ± 2°C for 96h ± 1 h under a compressive stress of 3.5
a. The bearings shall be conditioned at -25°C ± 2°C for 96h ± 1 h under a compressive stress of 3.5
MPa and a shear strain of 15% of the effective rubber thickness.
b. The bearing shall be deformed to a shear strain of 25% of the effective rubber thickness while
b. The bearing shall be deformed to a shear strain of 25% of the effective rubber thickness while
maintaining the compressive stress of 3.5 MPa.
c. The force required to maintain the shear strain of the effective rubber thickness 15 minutes after
c. The force required to maintain the shear strain of the effective rubber thickness 15 minutes after
the strain is achieved, shall be recorded.
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Contact: Ms. Allison Zhang
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Tel: 86-318-8538202
Email: allison@zqdcrubber.com
Skype: allisondacheng
