To provide a base isolation structure capable of improving base isolation performance with a simple structure and simplifying a manufacture, and provide a simple manufacturing method.
A compound laminated body is provided by alternately laminating a plurality of hard plates 14 having rigidity between upper and lower surface plates and a plurality of soft plates 16 having viscous and elastic property, a hole for penetrating the compound laminated body is arranged in the compound laminated body 12, and a frictional plate 20 is sealed in the hole. When hysteresis ratio at the time of tensile deformation of 100% at 25°C in a material having viscous and elastic property for composing the soft plate 16 is set to h100, its formula is set as 0.3≤h100≤0.6. When the diameter of an opening is set to (r) and the diameter of the compound laminated body is set to (R), those ratio (r/R) is set to be within 0.10≤r/R≤0.03.
OGIWARA HIDETOSHI
FUKAHORI YOSHIHIDE
Next Patent: ROLLING VIBRATION REDUCING DEVICE FOR ENGINE