JPS62111027A - Vibration insulator - Google Patents

Abstract

PURPOSE:To increase the damping effect of vibration by a method in which a laminated layer rubber is attached through the first and second fixing member between a structure and a foundation, and a viscous material and an elastic material are set in the holes of the rubber. CONSTITUTION:A laminated layer rubber 6 is attached through the first fixing member 10 and the second fixing member 11 between a structure 8 and a foundation 3, and a viscous material 12 is provided in the holes of the rubber 6. One or a plurality of elastic materials 13 provided to the second fixing member 11 are provided in the viscous material 12. Since the rubber 6 is deformed when the foundation 3 moves, the viscous material 12 is moved to generate a relative movement even between the elastic material 13 and the viscous material 12. Therefore, the viscous material 12 moves in the direction of extending to the back side of the elastic material 13 to generate a viscous resistance.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a vibration isolating device for a structure supported using laminated rubber, and particularly to a vibration isolating device suitable for increasing the damping effect. be.

[Background of the invention]

In order to prevent the typical vibrations and seismic motions that normally propagate through the foundation from being transmitted directly to the structure, an elastic body such as anti-vibration rubber, air springs, or metal springs is inserted between the structure and the foundation. This provides vibration isolation (vibration isolation, seismic isolation) for the structure. In this case, the natural frequency of the vibration isolation system (or seismic isolation system) consisting of the structure and the vibration isolating rubber, air spring, or metal spring that acts as a spring is generally set lower than the predominant frequency of ordinary microvibrations and seismic motion. The filter effect is used to reduce the vibration response of the structure.

However, when receiving an earthquake input, the response acceleration of a structure with anti-vibration support (or seismic isolation support) is much lower than with rigid support, but the relative displacement between the structure and its surroundings becomes large, so piping and wiring , there is a risk that the elastic body such as vibration-proof rubber may break or cause impact with the surrounding area. In order to reduce the relative displacement between the vibration-proof supported (or seismically isolated supported) structure and the surroundings during an earthquake, it is effective to use a damping device in conjunction with the elastic body support device. Commonly used damping devices are oil dampers, friction dampers, or elastoplastic dampers.

Recently, laminated rubber, a type of anti-vibration rubber, has been developed to provide anti-vibration protection for structures (
or Men'JM).

This laminated rubber has a structure in which rubber plates and iron plates are laminated, and the compression rigidity of the laminated rubber can be much greater than its shear opening property, and the compression rigidity and shear opening property can be designed independently. For example, as described in Japanese Patent Publication No. 58-30470, a compact vibration insulating yVAv1 (lead rubber bearing) which integrates an elastic support device and a damping device by inserting a lead plug into the above-mentioned laminated rubber is created. be. However, lead, which is an elastoplastic material, exhibits large rigidity when subjected to minute deformation, which impedes the filtering effect of the laminated rubber due to its small rigidity. Therefore, it is inappropriate to use lead rubber bearings as vibration isolation and seismic isolation devices for structures.

In addition, although it is generally considered advantageous to use button rubber bearings for seismic isolation, it is especially important for lead plugs to yield due to the heat generated during plastic deformation, especially when subjected to repeated large deformations. The disadvantage is that the stress is reduced and the damping effect is reduced.

[Purpose of the invention]

It is an object of the present invention to provide a 11'' isolation device with increased damping effect, reduced response and compact form factor.

[Summary of the invention]

The vibration isolating device of the present invention includes a laminated rubber with holes and a viscous material placed in the holes of the laminated rubber.

First and second attached to the upper and lower surfaces of the laminated rubber
The elastic member is attached to at least one of the fixing members. When shear deformation or compressive deformation occurs between the upper and lower fixed members, the viscous body within the laminated rubber also moves, creating a relative displacement between it and the elastic member, generating viscous resistance of the viscous body. This is a damping effect.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a longitudinal sectional view showing a state in which a laminated rubber 6 having a built-in damping mechanism as a vibration isolating device of the present invention is interposed between a foundation 3 and a structure 8. As shown in FIG. A first fixing member 10 and a second fixing member 11 are attached to the upper and lower surfaces of the laminated rubber 6, respectively.

The laminated rubber 6 is installed on the foundation 3 and the structure 8 via the first fixing member 10 and the second fixing member Y1. The above-mentioned laminated rubber 6 is perforated,
A viscous body 12 is provided in the hole. One or more elastic members 1:3 are installed on the viscous body L2 (for example, the second fixing member 1).Generally, the horizontal direction of the laminated rubber 6 is Since the spring constant is set to be much smaller than the spring constant in the vertical direction, it will undergo shear deformation in the horizontal direction, but will be constrained in the vertical direction.

FIG. 2 is a longitudinal sectional view of another embodiment of the invention.

In this example, as in FIG. 1, the second fixing member 11 is installed on the foundation 3, and the first fixing member 10 is installed on the structure 8, respectively.

It is constructed of a spring member presser plate 14, a spring member 15, and a friction plate 16 placed in a laminated rubber 6 with holes. This spring member plate holding plate 14 allows the spring member 1
5 can be given any compressive strain to adjust the frictional force.

Next, the operating principle of the embodiment shown in FIG. 1 is as follows. The natural frequency in the horizontal direction of the structure 8 supported by the laminated rubber 6 is set to be sufficiently low compared to the dominant frequency of ordinary vibrations and earthquake motions, so the structure 8 is able to resist ordinary vibrations and earthquakes due to the filter effect. Earthquake motion can be eliminated. Regarding the structure shown in FIG. 1, when the foundation 3 moves, the laminated rubber 6 deforms and the viscous body 12 in the laminated rubber 6 also moves, and the elastic member 13 attached to the second fixing member 11 moves. Relative motion also occurs with the viscous body 12. The viscous body 12 pressed by the elastic member 13 moves in the direction behind the first elastic member 13 . The viscous body 12 produced at this time
The viscous drag force acts as a damping effect. If the viscosity of the viscous body 12 is increased or the shape of the elastic member 13 is made larger, the damping effect will increase; conversely, if the viscosity of the viscous body 12 is lowered or the shape of the elastic members 1 and 3 is made smaller, the damping effect will be increased. decreases.

In addition, 1. In particular, when the laminated rubber 6 is used for vibration isolation not only in the shear direction but also in the compression direction, it is also effective to add projections or the like to the elastic member 1:3 to increase the resistance.

Another embodiment of the invention is shown in FIG. The example shown in FIG. 2 is an example in which the force applied to the elastic member 13 is kept constant, and the structure and initial production principle are the same as the example shown in FIG.

In addition, in the embodiments shown in FIGS. 1 and 2, the laminated rubber 6
The same effect can be obtained even if the lower part of the image is reversed.

〔Effect of the invention〕

According to the present invention, the cost reduction effect is increased, the response is reduced,
It has a high damping effect because it can be shaped into a compact shape.
It is possible to provide a vibration isolating device having a compact shape.

[Brief explanation of drawings]

FIG. 2 is a vertical cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view showing another embodiment of the present invention. 71...Foundation, 6...Laminated Go11.8...Structure,
10...First fixing member, 11...Second fixing member,]
2... Viscous body. ■ 1 ■ Figure Z

Claims (1)

[Claims] In a vibration isolating device placed between a structure and a foundation to insulate vibrations transmitted to the structure from normal vibrations and seismic motion, the upper surface of the laminated rubber placed between the structure and the foundation and A first fixing member and a second fixing member are attached to the lower surface, a hole is provided in the laminated rubber, a viscous body is provided in the hole of the laminated rubber, and a first fixing member is attached to the upper and lower surfaces of the laminated rubber. A vibration isolating device comprising an elastic member attached to at least one of the member and the second fixing member.