JPH09210123A - Light load seismic isolation device - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a seismic isolation device for light load, capable of sufficiently relaxing vibration energy and causing no buckling phenomenon. A rubber plate (10) and a metal plate (11) are alternately laminated and fixed to form an isolator (1).
A seismic isolation device for light loads, which is configured by fixing mounting plates 2 and 3 to the upper and lower parts of the isolator 1, wherein a hollow portion K is provided in the isolator 1, and the hollow portion K has one end on the mounting plate 2. , The deformation suppressing device 4 is installed in such a manner that the other end is attached to the mounting plate 3.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a light-load seismic isolation device.

[0002]

2. Description of the Related Art As a seismic isolation device, for example, as shown in FIG. 3, a rubber plate 90 and a metal plate 91 are alternately laminated and fixed (hereinafter, this part is referred to as an isolator) and attached to the upper and lower parts thereof. There is a structure in which the plates 93 and 94 are fixed to each other. In this device, the upper mounting plate 93 is attached to the structure A
Then, the lower mounting plate 94 is installed on the ground-side base body B so as to be attached thereto.

Therefore, when horizontal vibration occurs on the ground side, the isolator portion is sheared and deformed, whereby the vibration energy transmitted from the ground side base body B to the structure A side is absorbed.

However, when the seismic isolation device having the above-mentioned structure is adopted for a lightly loaded structure, there is a problem that the vibration energy is not sufficiently absorbed due to the large shear spring constant of the isolator portion. If the pressure receiving area is made smaller (longitudinal) in order to reduce the shear spring constant of the part, a buckling phenomenon occurs as shown in FIG.
There is a problem that the function as a device is not fulfilled at all.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a light load seismic isolation device which can sufficiently reduce vibration energy and which does not cause a buckling phenomenon.

[0006]

The present invention is a rubber plate 10.
And a metal plate 11 are alternately laminated and fixed to each other to form an isolator 1, and mounting plates 2 and 3 are fixed to upper and lower parts of the isolator 1, which is a seismic isolation device for a light load. The hollow portion K is provided in the
In addition, the deformation suppressing device 4 is installed in such a manner that one end side is attached to the attachment plate 2 and the other end is attached to the attachment plate 3.

The deformation suppressing device 4 may be a viscous damper or a coil spring, but in the former case, each end of the viscous damper is mounted on the mounting plates 2 and 3 in a spherical manner. It is necessary to treat them.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

The seismic isolation device for light loads of this embodiment is shown in FIG.
As shown in FIG. 2, the rubber plate 10 and the metal plate 1 are basically installed between a lightweight structure A such as a detached house and the ground side base body B.
1 and 2 are alternately laminated and fixed to form an isolator 1, and mounting plates 2 and 3 are fixed to the upper and lower portions of the isolator 1. Then, the viscous damper 40 (described in the column of means) is provided such that a hollow portion K is provided in the isolator 1 and one end side is attached to the mounting plate 2 and the other end is attached to the mounting plate 3 in the hollow portion K. (Corresponding to the deformation suppressing device 4) is installed.

As shown in FIG. 1, the rubber plate 10 is made of a thin annular rubber material having a hole diameter of about 1/2 of the outer diameter, and the rubber material is natural rubber or isoprene rubber. , Styrene rubber, urethane rubber, silicon rubber, etc. can be used. Furthermore, so-called high damping rubber (a rubber element has a spring element, a friction element for rubbing the molecules of each other, and a viscous damping element, and these elements are combined. Due to the effect, a rubber material having a high absorption rate of vibration energy can also be used.

As shown in FIG. 1, the metal plate 11 is an annular steel plate having a hole diameter of about ½ of the outer diameter, and has the same top view as the rubber plate. I'm using it.

As shown in FIG. 1, the mounting plates 2 and 3 are made of thick circular plates having the same outer diameter as the rubber plate 10. The mounting plates 2 and 3 are bolted to the structure A or the ground side foundation B. A bolt insertion hole (not shown) used for stopping is provided.

The hollow portion K has a rubber plate 1 as shown in FIG.
0 and the hole portion of the metal plate 11, and the viscous damper 40 is accommodated therein as described above. The viscous damper 40 has an upper end 40a as shown in FIG.
To the lower surface of the mounting plate 2 and the lower end 40b to the upper surface of the mounting plate 3 in a spherical pair state.

This seismic isolation device has the following functions because it is constructed as described above. When a relatively small horizontal vibration acts on the ground-side foundation B, the function of suppressing the displacement by the viscous damper 40 (suppressing the maximum displacement during the motion process) does not work so much, and therefore the shear deformation of the isolator 1 does not occur so much. Do not disturb Therefore, the isolator 1 can sufficiently absorb the vibration energy. Since the horizontal vibration is relatively small, the amount of shear deformation of the isolator 1 is small,
Therefore, the buckling phenomenon does not occur. When a large horizontal vibration acts on the ground-side foundation body B, the motion suppressing function of the viscous damper 40 largely works, and therefore shear deformation of the isolator 1 is greatly suppressed (see FIG. 2). In this case, although the amount of shear deformation of the isolator 1 is small, the vibration energy can be sufficiently absorbed by the entire device including the viscous damper.
Since the amount of shear deformation of the isolator 1 itself is small, the buckling phenomenon is prevented.

As described above, when the seismic isolation device for light load is used, the vibration energy can be sufficiently absorbed regardless of the magnitude of the horizontal vibration acting on the ground side foundation B, and the buckling phenomenon does not occur. Will be things.

In the above embodiment, the deformation suppressing device 4 is used.
Although the viscous damper is used as the above, the present invention is not limited to this, and a so-called displacement-dependent damper such as a coil spring may be used as the deformation suppressing device 4.

[0017]

Since the present invention has the above configuration, the following effects are obtained.

As is clear from the description in the section of the embodiment of the invention, the vibration energy can be sufficiently relaxed,
We were able to provide a seismic isolation device for light loads that does not cause buckling.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a light load seismic isolation device according to an embodiment of the present invention is installed between a structure and a ground-side foundation.

FIG. 2 is a front view showing a state of the base isolation device for light loads when horizontal vibration acts on the ground-side foundation body.

FIG. 3 is a front view showing a state where a conventional light load seismic isolation device is installed between a structure and a ground-side foundation.

FIG. 4 is a front view showing a state of a conventional seismic isolation device for light load when horizontal vibration acts on the ground-side foundation.

[Explanation of symbols]

 K hollow part 1 isolator 2 mounting plate 3 mounting plate 4 deformation suppressing device 10 rubber plate 11 metal plate

Claims (3)

[Claims] 1. A rubber plate (10) and a metal plate (11) are alternately laminated and fixed to form an isolator (1), and mounting plates (2) and (3) are provided on the upper and lower parts of the isolator (1). A seismic isolation device for a light load, which is configured to be fixed, wherein a hollow portion (K) is provided in an isolator (1), and the hollow portion (K) has one end side as a mounting plate (2) and the like. A seismic isolation device for light loads, characterized in that deformation suppressing devices (4) are installed in such a manner that the ends are attached to a mounting plate (3). 2. The deformation suppressing device (4) is a viscous damper, and each end of the viscous damper is attached to the attaching plates (2) and (3) by spherical treatment. The seismic isolation device for light loads described in 1. 3. The seismic isolation device for light loads according to claim 1, wherein the deformation suppressing device (4) is a coil spring.