- O I L E S / Isolation System Introduction -

The most compact system provides high performance seismic isolation.

Advantages

	Special steel plates and ball bearings provide high performance seismic isolation with a smooth motion (a coefficient of friction 0.003 or less).
	In a major earthquake, vibration of the floor can be reduced dramatically.
	A wide range of protection can be achieved from small vibrations to very large earthquakes.
	The height of the system is low, which impacts little on floor height.

	As the devices are small, they are relatively easy to install in existing buildings.
	Viscous fluid shows no aging phenomena and is maintenance free, so stable performance can be maintained.

Structure

2-D floor isolation system consists of special steel plates and hardened ball bearings, pretensioned coil springs, viscous fluid dampers, and steel beams.

Function

Ball bearings support the load on the floor, isolate vibration with almost no friction, and extend the vibration period of earthquakes with coil springs.
Viscous fluid dampers restrict displacement of the floor caused by earthquakes and damp the vibration.

Function and components

	Base isolation system and seismic isolator
functions	Ball bearing	Coil spring	Viscous fluid damper
To support load on the floor
To provide smooth motion
To reduce acceleration
To restrict large displacement
To prevent small force vibration
To return to the original position after an earthquake

Test

Performance Test

In order to confirm the effect of seismic isolation, an experiment for large vibration was carried out using seismic records.
Acceleration on the isolated floor was reduced by 80 to 90%, demonstrating excellent performance.

Performance of seismic isolation system demonstrated in the Great Hanshin Earthquake

Banks and life insurance buildings in the Hanshin district which had adopted the OILES floor isolation system were subjected to the strong vibration of the Great Hanshin Earthquake.OILES floor isolation system demonstrated the performance of seismic isolation against the huge earthquake. Facilities in buildings such as CPU were not damaged and their functions were protected. Normal operation was possible immediately after the earthquake.