| 摘要 |
PROBLEM TO BE SOLVED: To simplify a configuration of a base isolation system and restrict its manufacturing cost to an inexpensive price.SOLUTION: An attenuation force change-over base isolation system 10 comprises a plurality of hydraulic dampers 20 (20to 20), attenuation force change-over solenoid valves (30to 30), a seismoscope 40 for low acceleration, a seismoscope 50 for high acceleration, a control circuit 60 and a power source 70. When the seismoscope 40 for low acceleration detects lower acceleration than a prescribed value, the control circuit 60 turns on a solenoid valve change-over signal outputted with respect to each of the attenuation force change-over solenoid valves 30. Each of the attenuation force change-over solenoid valves 30 changes over an attenuation coefficient of dampers 20 to a low attenuation coefficient CL. When the seismoscope 50 for high acceleration detects higher acceleration than a prescribed value, the control circuit 60 changes over a solenoid valve change-over signal to off with respect to each of the attenuation force change-over solenoid valves 30. Each of the attenuation force change-over solenoid valves 30 changes over an attenuation coefficient of each of the hydraulic dampers 20 to a high attenuation coefficient CH. |
