Support structure for isolating earthquake motions

Abstract

A support structure for isolating earthquake motions having a pressure receiving concave curved steel plate connected with the ground and a pressure applying convex curved steel plate facing with said concaved steel plate and connected with a column of a structure. The support structure has a plurarities of large balls and small balls with (less accuracy) smaller diameter than that of pressure-receiving balls between said two plates in a state that they are mounted to come in point contact in all directions. Earthquake is isolated by a simultaneous rotation of these two groups of balls in frictionless state. The lower portion of the support structure is surrounded by a hoop to suppress the foundation column not to remove from pressure receiving balls in case of jump-up phenomenon caused by directly under earthquake or float-up phenomenon caused by typhoon etc.

What I claim is:  
     
         1 . A support structure for isolating earthquake motions, comprising: 
 a pressure receiving concave-curved steel plate connected with a structure foundation; and    a pressure applying convex-curved steel plate connected with a foundation column oppositing to said concave-curved steel plate, thus forming a gauge portion between them;    a means of interposing two types of pluralities of steel balls in said gauge between the concave-curved steel plate and convex-curved steel plate;    a means of arranging one type of said balls to be made with (less accuracy) smaller diameter than that of other group of balls:    a means of surrounding two types of pluralities of steel balls with aligning frame so that they are mounted to come in point contact in all directions;    a means of isolating a linkage of earthquake motions by confrictless rolling slide of said types of steel balls, a group of pressure receiving larger balls and a group of pressure applying smaller balls;    a means of covering all the surface of top and bottom steel plates except said curved surfaces with concrete, thus forming a column as a foundation of a constructure;    a means of jointing said column including said pressure applying convex curved surface with a foundation of a structure by bolts and nuts;    a means of isolating the linkage of earthquake motions to the structure by unified simultaneous rolling of said two types of balls;    
     
     
         2 . A support structure for isolating earthquake motions as claimed in  claim 1;   a means of moving the structural column vertically by foundation pressure receiving curved surface thereby, stops a propagating movement of earthquake by shock absorber effect of spherical level difference (energy generated), by which isolating the earthquake motion and stopping the free movement.    
     
     
         3 . A support structure for isolating earthquake motions as claimed in  claim 1;   a means of giving the foundation hoop a function of suppress the foundation column not to remove from the pressure receiving balls when jump-up phenomenon caused by directly under earthquake or float-up phenomenon caused by typhoon, in this case the hoop is put on the foundation.