Anti-seismic device

Abstract

Anti-seismic device for seismically isolating structure relative to ground including first support defining first support plane integrally connectable to upper portion and including two first hinges defining first constant reciprocal distance, second support defining second support plane including two second hinges defining second constant reciprocal distance, third support defining third support plane integrally connectable to lower portion and including two third hinges defining third constant reciprocal distance, and connector defining connection plane perpendicular to third support plane and including at least two first rigid bars, each defining a first non-deformable connection direction and two second rigid bars, each defining a second non-deformable connection direction. First bars transiently constrained to first hinges and second hinge so the first connection directions of first bars cross in the connection plane. Second bars transiently constrained to second hinges and third hinge so second connection directions of second bars cross in connection plane.

1 . An anti-seismic device for seismically isolating a structure with respect to the ground wherein it comprises:
 a first support defining a first support plane integrally connectable to an upper portion, for example to said structure, and comprising at least two first hinges defining a first constant reciprocal distance (d′),   a second support defining a second support plane comprising at least two second hinges defining a second constant reciprocal distance (d″),   a third support defining a third support plane integrally connectable to a lower portion, for example to said ground, and comprising at least two third hinges defining a third constant reciprocal distance (d′″), and   connection means defining a connection plane perpendicular to said third support plane and comprising at least:
 two first rigid bars, each defining a first non-deformable direction of connection and adapted to constrain said first support and said second support, and 
 two second rigid bars, each defining a second non-deformable direction of connection and adapted to constrain said second support and said third support, 
   said first bars each being transiently constrained to one of said first hinges and one of said second hinges so that said first directions of connection of said first bars cross in said connection plane, and   said second bars each being transiently constrained to one of said second hinges and one of said third hinges so that said second directions of connection of said second bars cross in said connection plane.   
     
     
         2 . The device according to  claim 1 , wherein said first distance (d′) and said third distance (d′″) are congruent and said second distance (d″) is less than said first and third distances (d′, d′″). 
     
     
         3 . The device according to  claim 1 , wherein said second distance (d″) is at least 3% less than said third distance (d′″). 
     
     
         4 . The device according to  claim 1 , wherein said supports and said connection means define at least two superimposed “Chebyshev guides”. 
     
     
         5 . The device according to  claim 1 , comprising a plurality of pairs of said first and second bars, which are parallel to each other along parallel and spaced connection planes. 
     
     
         6 . The device according to  claim 1 , wherein said supports each respectively comprise at least one support rod respectively adapted to rigidly connect said hinges. 
     
     
         7 . The device according to  claim 1 , wherein said supports each respectively comprise at least one support plate respectively coplanar with said support planes and respectively adapted to rigidly connect said hinges. 
     
     
         8 . The device according to  claim 1 , comprising two pairs of two second hinges. 
     
     
         9 . Earthquake-resistant foundations of a structure comprising a device according to  claim 1  and at least part of said structure, said structure being a building-type structure. 
     
     
         10 . The earthquake-resistant foundations according to  claim 1 , comprising a plurality of said devices, wherein said respective third support planes are all coplanar. 
     
     
         11 . The earthquake-resistant foundations according to  claim 1 , comprising a plurality of said devices, wherein said devices are arranged consecutively overlapping, one of said third support planes being integral with a lower portion, one of said first support planes being integral with an upper portion, said other first support planes and third support planes being integral with each other, and each of said devices defining at least one said connection plane which is skewed with respect to said connection planes of said other devices so as to allow said foundations to absorb a plurality of seismic stresses in different directions along said connection planes.