JPH0536032Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a device that limits the horizontal displacement of a seismic isolation floor during a major earthquake.

PRIOR ART

Seismic isolation floors using laminated rubber or air springs have been known for reducing vibration response during earthquakes.

[The problem that the idea aims to solve]

The conventional seismic isolation floor mentioned above does not have a fail-safe mechanism to suppress the horizontal response displacement below the allowable value, so in the event of a large earthquake that exceeds the design value, the seismic isolation floor will undergo a large horizontal displacement. There is a problem in that collisions with walls or non-seismic isolation floors inevitably result in damage to equipment placed on the seismic isolation floors.

The present invention attempts to solve these problems. That is, an object of the present invention is to provide a device that limits the horizontal large displacement of a seismic isolation floor to a permissible value or less during a major earthquake.

[Means to solve the problem]

In order to achieve the above object, the device for limiting the horizontal displacement of a seismic isolation floor in the present invention includes an annular contact plate that is attached to the lower surface of the seismic isolation floor and protrudes downward, and an annular contact plate that faces the seismic isolation floor. It comprises a pedestal and an additional spring mounting plate fixed in order to the upper surface of the fixed bed, a protruding stopper fixed to the center of the upper surface of the pedestal and tapered upward, and an outer peripheral side of the protruding stopper. and a donut-shaped additional spring made of rubber fixed to the upper surface of the additional spring mounting plate, and having an outer diameter suitably smaller than the contact plate and located inside the corresponding plate. and an annular receiving plate fixed to the upper surface of the additional spring so as to be located above the lower end of the corresponding plate.

[Effect]

According to the present invention, when the horizontal response displacement of the seismic isolation floor is small, such as in the case of a small earthquake, the contact plate does not come into contact with the receiving plate fixed to the upper surface of the additional spring, but separates from it. However, as the earthquake got bigger,
When the horizontal displacement exceeds the set value, the contact plate collides with the receiving plate, which acts on the additional spring, increasing the horizontal spring constant between the fixed floor and the seismic isolation floor, and suppressing the displacement of the seismic isolation floor. . The earthquake got even bigger,
When the response displacement increases and the protruding stopper and additional spring come into contact, the response horizontal displacement is completely suppressed.

〔Example〕

FIG. 1 shows an embodiment of the present invention. 1st
In the figure, 1 is a seismic isolation floor, 2 is an annular contact plate attached to the lower surface of the seismic isolation floor 1 and protrudes downward, and 3 is a fixed floor facing the seismic isolation floor 1. Further, as shown in FIGS. 2 to 4, 4 is a pedestal fixed to the upper surface of the fixed floor 3, 5 is an additional spring mounting plate fixed to the upper surface of the pedestal 4, and 6
is a truncated conical protruding stopper which is fixed to the center of the upper surface of the pedestal 4 by welding and tapers upwardly. As shown in FIG. 2, 7 is a rubber donut-shaped additional spring located on the outer circumferential side of the protruding stopper 6 and fixed to the upper surface of the additional spring mounting plate 5; An annular receiver having a suitably small outer diameter (outer diameter) is located inside the contact plate 2 and is fixed to the upper surface of the additional spring 7 so as to be located above the lower end of the contact plate 2. It is a board.

Note that 9 shown in FIG. 2 is a cushioning rubber fixed to the outer periphery of the receiving plate 8. Although not shown, the seismic isolation floor 1 is placed on a fixed floor 3 of a building or the like via air springs or the like.

In the horizontal displacement limiting device for the seismic isolation floor 1 configured as shown in the figure, in the event of a small earthquake, etc.
When the horizontal response displacement of the seismic isolation floor 1 is small, the contact plate 2 is separated from the receiving plate 8 without contacting it. However, when the earthquake becomes large and the horizontal displacement exceeds the set value, the contact plate 2 collides with the receiving plate 8, which acts on the additional spring 7, causing the horizontal displacement between the fixed floor 3 and the seismic isolation floor 1 to The directional spring constant increases, and the displacement of the seismic isolation floor 1 is suppressed. As the earthquake becomes larger, the response displacement increases, and when the protruding stopper 6 and the additional spring 7 hit, the response horizontal displacement is completely suppressed.

By appropriately adjusting the shape of the protruding stopper 6, that is, the shape that tapers upward, the characteristics of the additional spring 7 can be made non-linear, and the response acceleration of the seismic isolation floor 1 when the additional spring effect is exerted can be adjusted. can be minimized.

[Effect of idea]

As explained above, according to the present invention, an additional donut-shaped rubber spring that generates a spring force due to shear deformation and a protruding stopper that tapers upward are provided on the fixed bed side, and the Since an annular contact plate is installed on the seismic floor, it is possible to limit and suppress large displacements that exceed the set value of the seismic isolation floor in any horizontal direction. It works effectively as a fail-safe mechanism.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention; Fig. 2 is an enlarged cross-sectional front view showing the protruding stopper and additional spring shown in Fig. 1;
The figure is a front view showing the pedestal and protruding stopper shown in FIG. 1, and FIG. 4 is a plan view of FIG. 3. 1... Seismic isolation floor, 2... Hit plate, 3... Fixed floor,
4... Pedestal, 5... Additional spring mounting plate, 6... Protruding stopper, 7... Additional spring, 8... Receiving plate, 9...
Rubber for cushioning.

Claims (1)

[Scope of utility model registration request] comprising an annular contact plate attached to the lower surface of the seismic isolation floor and protruding downward; a pedestal and an additional spring mounting plate fixed in order to the upper surface of the fixed floor facing the seismic isolation floor; a protruding stopper fixed to the center of the upper surface of the pedestal and tapering upward; and a donut-shaped rubber donut located on the outer periphery of the protruding stopper and fixed to the upper surface of the additional spring mounting plate. The additional spring has an outer diameter suitably smaller than the abutment plate, is located inside the abutment plate, and is located above the lower end of the abutment plate. A device for limiting horizontal displacement of a seismic isolation floor, characterized by comprising an annular receiving plate fixed to the upper surface.