We use the term “Bridge Bearing” as an indication of quality. All bearings
that support bridges or highway overpasses use Neoprene or Natural
Rubber compounds, so the molded product has high tensile and elongation
characteristics and minimal permanent set and creep. Similarly, they must
pass rigid tests in ozone and oxygen resistance.
When the pads are used for vibration isolation in supporting buildings or
components such as structural floors, secondary floating floors, maximum
“Dynamic Stiffness” is another specified characteristic. This is important as
the Dynamic Stiffness, Deflection and the shape of the Load Deflection
curve controls frequency.
Bearing pads are always solid pads (unlike our waffle pads), because
loadings per square inch are high, often in the range of 1000psi (70kg/cm2).
Capacities are controlled by area, hardness (durometer), thickness and
perimeter relative to the loaded area.
Most of the time we design these pads to specific requirements as per customer requirements/Std specification
While they can certainly be used in acoustical applications, there is a
constant contractor need for a high capacity pad for pipe supports,
structural supports, etc., in the load range of these pads.
Pads can be stacked with 1/8”(3mm) steel plates between them up to
250psi(17.5 kg/cm2) for higher deflections and greater efficiency. Higher
loadings per square inch (cm2) require bonded inserts to avoid pancaking.