Plain and laminated elastomeric bridge bearings are designated by hardness durometer size and configuration and in the case of laminated bearings by the thickness of the individual layers of elastomer and the size and position of any steel top plates.
Plain and laminated elastomeric bridge bearings.
High capacity steel plate laminated bearings also known as elastomeric bearings laminated bearings or elastomeric laminated bearings granor has supplied specially designed laminated bearings up to 800 x 800 x 321 mm.
Vertical load and rotations are accommodated through vertical deflection while horizontal movement is accommodated through shear deformation.
The elastomer for the manufacture of the bearing is furnished in two types.
Laminated elastomeric bearing pad one type of reinforced elastomeric bearings is made of multi layer rubber and reinforced with steel plate through sulfuration and adhesion compared with non reinforced elastomeric bearing it has sufficient vertical rigidity which can reliably transfer the concentrated down loads and impact loads of the superstructure to both ends of the pier.
Sliding elastomeric bridge bearings a bearing consisting of a plain or steel laminated elastomeric element bonded to a lower steel bearing plate.
Unlike most other elastomer neoprene rubber under goes no marked stiffening at low temperature when the thermal contraction of the bridge deck is at maximum.
To ail ow movement surface of the element shah be faced with a steel backed sheet and support a sliding top bearing plate.
Neoprene bridge bearings plain or laminated elastomeric bearings are much easier to install in a bridge than compared to other types of bearing used and require nil maintenance.
These bearing pads allow for more rotation and movement capabilities than plain bearing pads.
The addition of a low friction sliding surface allows a standard laminated elastomeric bearing device to accommodate unlimited horizontal displacement without increasing the height of the bearing assembly.
The result is a comprehensive catalogue of elastomeric bearings covering.
Elastomeric bearings furnished under this specification shall adequately provide for thermal expansion and contraction rotation camber changes and creep and shrinkage where applicable of structural members.
For applications where horizontal displacements exceed 2 inches 50mm sliding elastomeric bearing assemblies may provide an economical solution.
The mating sur fac e plate shah be faced with polished stainless steel.
Elastomeric laminated bearings elastomeric laminated bearings elb s are made from high purity elastomers which encapsulate layered internal steel reinforcing plates.
The bearings are furnished in four types as follows.
Dynamex laminated bearings consist of elastomer material vulcanized to multiple internal steel shims.
Designed for use in bridge and building construction under pre cast concrete beams steel beam supports and other support points.
Plain elastomeric sandwich bearing.
Standard un reinforced bearing pads and strips.
Plain elastomeric bearing pad.
This specification covers the material requirements for plain and laminated elastomeric bridge bearings.
