Seismic Isolation Floor System "KEEP"

The seismic isolation mechanical portion of the base-isolation foundation KEEP

Base isolator section of KEEP

The base-isolation foundation KEEP is adaptable to two-dimensional and full three-dimensional base-isolation.

The KEEP seismic isolation floor absorbs vibration via an oil damper and a vertical coiled spring and can thereby exert a damping performance during a vibration test corresponding to a large-scale earthquake.

Characteristics/Certification

Certification of Ministry of Land, Infrastructure, Transport and Tourism
Base-isolation foundations structuring method
｢ Seismic Isolation Floor System "KEEP" (two dimensions)｣
｢ Seismic Isolation Floor System "KEEP" (three dimensions)｣

This base-isolation foundation is the world's first full three-dimensional base-isolation foundation, characterized in that a vertical base-isolation foundation is incorporated into a horizontal base-isolation foundation.
In a test, conducted based on the assumption of a large-scale earthquake occurring, a horizontal seismic wave and vertical seismic wave can be damped to one fifteenth and one quarter of their original extent respectively, as response waves.
Two-dimensional and three-dimensional seismic vibration energy can be absorbed via the oil damper and the vertical coiled spring.
Execution of this base-isolation foundation can be performed irrespective of existing and new buildings.

Vibration Stage Test

Result of the simultaneous vibration tests, horizontally and vertically

Example of analyzing Hyogo ken-Nambu Earthquake

Schematic View

Seismic Isolation Floor System "KEEP"

Characteristics/Certification

Vibration Stage Test

Result of the simultaneous vibration tests, horizontally and vertically

Example of analyzing Hyogo ken-Nambu Earthquake

Schematic View

Schematic View of Partially Three-Dimensional Base-Isolation Foundation "KEEP"