Vertical-only seismic isolation floors are designed to protect critical equipment from shaking during earthquakes. It reduces the vertical vibration acceleration on the floor during an earthquake.

Product Overview

Product name

Vertical seismic isolation floor system

model number

None for completely made-to-order items

forte

• The entire floor can be seismically isolated from the upper and lower floors.
• When incorporated into a horizontal seismic isolation building, the floor becomes a 3-dimensional seismic isolation floor.
• We handle everything from vibration analysis to design construction and performance verification.
• Changes in floor loading or equipment location do not affect seismic isolation performance.
• Friction dampers have reduced the discomfort associated with walking on the upper and lower seismic isolation floors.
• The space between the fixed floor and the seismic isolation floor is sealed with special hardware to prevent objects and dust from entering.

Video materials (using YouTube)

This is a vibration test video of the seismic isolation floor for vertical use. You can see that it reduces vertical shaking.
The input seismic wave is from the southern Hyogo Prefecture earthquake that occurred on Tuesday, January 17, 1995.

This is a video of a vibration test of a seismic isolation floor for upper and lower floors.
The picture shows the underfloor conditions.
The input seismic wave is the data observed in Furukawa City, Miyagi Prefecture, Japan, at 14:46 on March 11, 2011 (Friday), the epicenter of which was the Tohoku Region Pacific Offshore Earthquake that occurred off the Pacific Sanriku Coast (the Tohoku Region Pacific Offshore Seismic Wave).

structure

elements

(1) Leveling valve

Maintains constant floor level regardless of load

(2) Hydraulic damper

Reduces floor sway during earthquakes

(3) Air tank

Lowers the natural frequency of air springs and improves the seismic isolation effect

(4) Air spring

Supports floor load and at the same time absorbs vertical forces during earthquakes

(5) Friction damper

Improve the walking feel of seismically isolated floors

(6) Compressor

Generates compressed air

(7) Operation control panel

Controls the raising and lowering of the seismic isolation floor

Case Studies

Example of seismic isolation measures