Pot Bearing;

A natural rubber disk that is completely enclosed in a steel pot allows tilting movements around any horizontal axis due to its capacity to deform.


Rainbow Enterprise Pot Bearings are durable bearings that can be used in many situations, whether in big or small bridges, or a variety of engineering structures. Design The construction principle of a pot bearing corresponds to a fixed bearing and thus allows rotations around any horizontal axis (point tilting) by shear deformation of an elastomer pad included in a steel pot. The used elastomer keeps its volume constant under allround compressions and thus is incompressible (no sinking under load). By providing a sliding plate a fixed bearing becomes a generally mobile one and/or by additional attachment of a guide stop a unidirectional mobile pot sliding bearing. The bearing pot is machined either from one piece or formed by welding a pot ring to the pot base. The elastomer pad inserted into the pot is secured against pressing out from the annular gap, located between pot cover and pot ring, by means of a pressure seal. The pot is closed by a cover, which meshes to the pot and adapts to the elastomer plate. In case of a fixed bearing it is usually fitted below and transfers the loads directly into the substructure. For the pot sliding bearing another sliding plate is attached to and usually above the cover. Therefore a PTFE disc is inserted into the top of the pot cover. To increase its loadbearing capacity, and as for the spherical bearing it is enclosed into the steel approximately to half  of its thickness. The sliding plate provided with an austenitic chromenickel-alloyed steel sheet slides upon it. The PTFE discs are provided with recesses (lubrication bore reliefs), which serve for storing a special lubricant to guarantee a permanent lubrication of the sliding surfaces. To achieve small coefficients of friction the austenitic sliding surface is finished with smallest surface roughness.

 

Function:


Due to the allround embedding of the elastomer pad the characteristics of the rubber, which is ideal for bearing constructions, are suitable for high and very high loads. A vital point is the function ability of the seal. The patented PTFE/carbon seal used by Maurer Söhne is suitable even for larger imposed load rotations which occur with steel and railway bridges. The twisting of the bearing is rendered possible by an elastic shear deformation within the pad. Due to the resulting strain, which depends on the size of rotation, the permissible angle of rotation must be limited. With increasing rotation the restoring moment
rises. Larger angles of rotation require additional constructive measures when sealing the annular gap. The pot’s dimensions in the layout result from the permissible compressions in the elastomer and the adjacent components.

 

Fixed pot bearing TF;

 

The very simply constructed fixed  bearing, which consists only of pot, elastomer pad and pot cover, transfers horizontal forces in both axis directions actuated by adherence by contact between cover and ring. The steel/steel friction, arising in the contact area, must be considered on determination of torsional restraint.

 

Generally mobile pot bearing TGa;

 

Displacements in x- and y-direction are permitted. No absorption of outside horizontal forces.

 

Unilaterally mobile pot bearing TGe;

 

This bearing is locked in one axis direction by a guide stop and thus can absorb horizontal forces rectangularly to the guide stop. The guide stop transfers the horizontal forces from the sliding plate into the pot cover, where they will be transferred by contact into the pot ring actuated by adherence. The elastomer pad is not used for deducing horizontal loads. Friction restraints in the contact area between guide stop and sliding plate are kept small by suitable sliding parts. Instead of one axially arranged guide stop two lateral guide stops can be provided.

 
   
     
     
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