Seismic isolation system having damper type damping mechanism

Abstract

The present invention provides a method for fixing an orthogonal angle of rollers in a seismic isolation system having a support mechanism by the rollers which are overlapped up and down and orthogonal to each other, Since a structure is shaken when a damping three of a damping mechanism exceeds seismic energy, a damping mechanism having a function of controlling and suppressing the damping force in accordance with the seismic energy is also produced. In order to maintain the orthogonal angle of the rollers, retaining materials having slight clearances which allow rolling of the rollers are attached to orthogonal parts of the rollers so as to fix the orthogonal angle. Meanwhile, energy absorption when a linear steel material is wound around a cylindrical material and continuously deformed by a horizontal force serves as the damping force, and by changing an axial section area of the linear steel material, an energy absorbing amount is controlled. By interrupting the horizontal force so as to cancel the energy absorption, the energy absorption of the linear steel material is suppressed upon a swing range of a small earthquake, so that the damping three can he controlled and suppressed. The present invention provides such a damper type damping mechanism.

1 . A seismic isolation system to be arranged between an upper surface of a substructure and a lower surface of a superstructure as a seismic isolation mechanism, having top and bottom rollers which are orthogonal to each other, the seismic isolation system comprising:
 a fixing mechanism of an orthogonal angle of the rollers, in which retaining materials for allowing rotation of the top and bottom rollers and retaining the orthogonal angle of the rollers are attached to outer sides of roller crossing parts which are other than contact parts of the rollers.   
     
     
         2 . The seismic isolation system according to  claim 1 , comprising:
 a damping mechanism in which:   brackets supporting both ends of a linear steel material and brackets supporting both ends of a cylindrical material are fixed to the upper surface of the substructure and the lower surface of the superstructure so as to face each other;   the bracket of the cylindrical material has a support hole allowing upward and downward movement of the cylindrical material;   the cylindrical material is rotatably and freely fitted to an outer cylindrical material, and has length which is, preparing for horizontal displacement of the superstructure, displacement width thereof or more, and length of the outer cylindrical material or more; and   the linear steel material is wound around the outer cylindrical material,   both the ends of the steel material are fixed to the brackets of the steel material in opposite directions which are orthogonal to the cylindrical material, and   fixing positions of the brackets of the steel material are set to be width which is more than the horizontal displacement width of the superstructure from the outer cylindrical material.   
     
     
         3 . The seismic isolation system according to  claim 2 , wherein
 a clearance is provided between an outer diameter of the cylindrical material and an inner diameter of the outer cylindrical material in the damping mechanism.   
     
     
         4 . The seismic isolation system according to  claim 2 , wherein
 a clearance in the horizontal direction is provided between the support hole of the bracket of the cylindrical material and an outer diameter of the cylindrical material supported on the hole in the damping mechanism.   
     
     
         5 . The seismic isolation system according to  claim 3 , wherein
 an axial section area of the linear steel material is continuously changed in the damping mechanism.   
     
     
         6 . The seismic isolation system according to  claim 3 , wherein
 the number of leftward winding and the number of rightward winding of the linear steel material are the same, or the linear steel material has such a section area that an axial resistance force of the leftward winding direction and an axial resistance force of the rightward winding direction are the same in the damping mechanism.   
     
     
         7 . The seismic isolation system according to  claim 4 , wherein
 an axial section area of the linear steel material is continuously changed in the damping mechanism.   
     
     
         8 . The seismic isolation system according to  claim 4 , wherein
 the number of leftward winding and the number of rightward winding of the linear steel material are the same, or the linear steel material has such a section area that an axial resistance force of the leftward winding direction and an axial resistance force of the rightward winding direction are the same in the damping mechanism.   
     
     
         9 . The seismic isolation system according to  claim 5 , wherein
 the number of leftward winding and the number of rightward winding of the linear steel material are the same, or the linear steel material has such a section area that an axial resistance force of the leftward winding direction and an axial resistance force of the rightward winding direction are the same in the damping mechanism.   
     
     
         10 . The seismic isolation system according to  claim 7 , wherein
 the number of leftward winding and the number of rightward winding of the linear steel material are the same, or the linear steel material has such a section area that an axial resistance force of the leftward winding direction and an axial resistance force of the rightward winding direction are the same in the damping mechanism.