JP2000017890A - Vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure load-bearing performance, and to display an extremely high damping effect while preventing the deterioration of durability due to damage and rupture by singly using a viscous fluid. SOLUTION: Composite laminates 4, in which rigid plates having rigidity and elastic plates are arranged alternately and laminated at a plurality of stage, are installed between upper-lower face plates 2, 3, and A viscous fluid 6 is sealed and filled into cylindrical hollow sections 5 formed by penetrating the composite laminates 4 in the laminating direction at the central sections of the composite laminates 4 while cylindrical members 7 having orifice holes 8 imparting resistance to the flow of the viscous fluid 6 at the time of the deformation of the composite laminates 4 are mounted into the hollow sections 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device, and more particularly to a seismic isolation device which can be suitably used for a lightweight structure such as a detached house or a general house.

[0002]

2. Description of the Related Art In this type of seismic isolation device, a composite laminate is generally used in which rigid plates having rigidity such as steel plates and elastic plates such as rubber are alternately arranged and laminated in a plurality of stages. It is a target. However, if only such a composite laminate is used alone, in order to secure the load supporting performance of the upper structure, a high elastic material having a relatively large spring stiffness is used as an elastic plate such as rubber. The energy absorption capacity of the composite laminate itself, that is, the damping (seismic isolation) effect is small.

Therefore, conventionally, as means for adding damping performance to the seismic isolation effect of the composite laminate, for example, Japanese Patent Application Laid-Open Nos. Hei 9-17767 and Hei 9-177
368, JP-A-9-177369, JP-A-9-242377 and the like,
A hollow portion that penetrates the composite laminate in the laminating direction is formed at the center of the composite laminate, and metal beads such as glass beads, iron balls, and copper balls, sand, quartz powder, sand for sandblasting, and the like are formed in the hollow portion. By filling spherical, spindle-shaped and irregular shaped hard granular materials, when the composite laminate is deformed due to the occurrence of earthquake, etc., the damping performance by the frictional force between the particle surfaces of the hard granular materials that move according to the deformation There have been many proposals for exerting a damping effect.

Further, as disclosed in Japanese Patent Application Laid-Open No. 7-84815, metal, ceramic, glass, plastic, and high-viscosity materials such as liquid, rubber, and resin are placed in the hollow portion of the composite laminate. By enclosing spherical or columnar solid materials such as hardness rubber, wood, rock, etc.
In addition to the contact between the viscous body and the inner wall surface of the hollow portion, a proposal has been made to secure the contact between the viscous body and the solid substance so as to exert a large damping effect by increasing the total contact area.

[0005]

However, among the above-described conventional seismic isolation devices, those in which the hollow portion of the composite laminate is filled with hard particles have a small contact area between the particle surfaces of the hard particles. Furthermore, the damping effect obtained by those frictional forces is not sufficient. On the other hand, in the case where both the viscous material and the solid substance are enclosed in the hollow part of the composite laminate, damping is performed by damping due to the frictional force generated when the viscous body and the fixed substance are deformed due to the deformation of the composite laminate. Therefore, the frictional force can be expected to increase only by increasing the total contact area compared to the case where the hard granular material is filled alone and damping is performed by frictional force between the particle surfaces of the hard granular material alone. Therefore, the damping effect obtained by the frictional force is small.

In addition, in each of the above conventional seismic isolation devices, the hollow portion of the composite laminate is filled or sealed with a hard granular material or a solid substance. In the case of deformation, especially when deformed significantly, the hard filling or inclusion damages the elastic plate such as rubber that composes the composite laminate and easily causes the composite laminate to break, break, etc. The durability of the whole seismic isolation device, which is required to be used continuously thereafter, was also insufficient.

The present invention has been made in view of the above-mentioned circumstances, and has a very high damping while ensuring load-bearing performance and preventing a decrease in durability due to breakage or breakage by using a viscous fluid alone. The purpose is to provide a seismic isolation device that can exert its effects.

[0008]

In order to achieve the above object, a seismic isolation device according to the present invention comprises a plurality of stages in which rigid and elastic plates having rigidity are alternately arranged between upper and lower face plates. A seismic isolation device comprising: a composite laminated body formed by laminating; and a hollow portion penetrating the composite laminated body in the laminating direction at a center portion of the composite laminated body. A viscous fluid is filled in a sealed state, and a member having an orifice for providing resistance to the flow of the viscous fluid when the composite laminate is deformed is provided at at least one location in the hollow portion. It is.

According to the present invention having the above-described configuration, the composite laminate and the viscous fluid filled in the hollow portion of the composite laminate ensure sufficient load-bearing performance, and the composite laminate is deformed due to an earthquake or the like. In addition to the viscous resistance of the viscous fluid that is filled and filled in the hollow part, the orifice effect provides resistance to the flow of the viscous fluid moving in the hollow part, resulting in a large damping effect. Can be exhibited. In addition, by using a viscous fluid alone, there is no danger that the elastic plate of the composite laminate will be damaged during an earthquake, and a predetermined damping effect will be ensured even during long-term continuous use after the occurrence of an earthquake. Sex can be promoted.

In the seismic isolation device having the above structure, a stopper for preventing deformation of the composite laminate at a certain degree or more is provided in the hollow portion of the composite laminate, and the stopper is connected to one side of the stopper. When the horizontal force at the time of the earthquake is equal to or less than a predetermined value, the displacement of the composite laminate is regulated, and when the horizontal force exceeds a predetermined value, the displacement of the composite laminate is limited. By providing an allowable trigger mechanism, it is possible to prevent the composite laminate from excessively deforming and buckling due to the occurrence of an earthquake, etc., and at normal times, the upper structure shakes due to the influence of wind, etc. As a result, it is possible to suppress deterioration of habitability such as a resident becoming seasick.

Further, in the seismic isolation device having the above structure, it is preferable to use a high-damping rubber as the elastic plate in the composite laminate.

In the present invention, the viscous fluid to be filled and filled in the hollow portion of the composite laminate is a vegetable oil-based softener such as linseed oil, soybean oil, rapeseed oil, olive oil, castor oil, etc .; aroma oil, naphthenic oil , Mineral oil-based softeners such as paraffin-based oils; low-molecular-weight oils such as silicone oils; low-molecular-weight rubbers such as liquid rubbers; and esters, lubricants such as DHP, DOP, and DNP as plasticizers. By adding an appropriate amount of liquid paraffin, fluorocarbon, polyglycol, fatty acid polyglycol ester, or the like, it is possible to adjust the viscosity, lubricity, rigidity, etc. of the viscous fluid to further improve the damping effect.

It is also effective to mix various antioxidants, antioxidants, stabilizers, flame retardants and the like in order to suppress the change in the physical properties of the viscous fluid.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a seismic isolation device according to a first embodiment of the present invention.
Fig. 2 shows a state in which the upper and lower face plates (iron plates)
A rigid plate 4a having rigidity, such as a steel plate,
A composite laminated body 4 formed by alternately arranging elastic layers 4b of rubber or the like and laminating them in a plurality of stages is fixed.

Here, a steel plate is most suitable as the hard plate 4a, but other than this, a metal, ceramics, hard plastics such as FRP, wood, a slate plate, a decorative plate or the like may be used. Further, as the elastic plate 4b, various vulcanized rubbers, unvulcanized rubbers, urethane rubbers, thermoplastic rubbers and the like may be used, but it is particularly preferable to use a high attenuation rubber. Further, the shape of the hard plate 4a and the elastic plate 4b is not limited to a circle, but may be a square or a polygon.

At the center of the composite laminate 4, a cylindrical hollow portion 5 penetrating the composite laminate 4 in the laminating direction is formed. 6 is filled in a sealed state, and a plurality of cylindrical members 7 have upper ends thereof at a plurality of equally-spaced portions on the same circumference corresponding to approximately one-half in the radial direction in the cylindrical hollow portion 5. It is fixed to the upper surface plate 2 and arranged in a vertical posture with its lower end slightly separated from the lower surface plate 3. Each of the plurality of cylindrical members 7 is formed with an orifice hole 8 which radially penetrates at an interval in the axial direction (vertical direction) of the cylindrical member. When the laminate 4 is deformed, a resistance is given to the flow of the viscous fluid 6 by an orifice effect generated when a part of the viscous fluid 6 moving in the hollow portion 5 passes through the orifice holes 8. ing.

The size of the cylindrical hollow portion 5 formed in the composite laminate 4 is appropriately determined according to the application place of the seismic isolation device 1 and the like. 5 and the cross-sectional area B of the entire seismic isolation device 1 (A /
In B), it is preferable to set the range of 0.7 ≦ A / B ≦ 0.85. This ratio (A / B) is 0.
When it exceeds 85, the functions (restoring force function, damping function, etc.) of the composite laminate 4 cannot be sufficiently exhibited. Also, 0.
If it is less than 70, the size of the hollow portion 5 becomes small, and a sufficient effect by the viscous fluid 6 cannot be expected.

The number and size (diameter) of the cylindrical members 7 and the number and diameter of the orifice holes 8 also depend on the location where the seismic isolation device 1 is applied, the volume and viscosity of the viscous fluid 6, and the like. Is appropriately determined so as to achieve a predetermined damping effect.

FIG. 3 is a vertical sectional view showing a seismic isolation device according to a second embodiment of the present invention, and FIG. 4 is a longitudinal sectional view showing a seismic isolation device according to a third embodiment of the present invention. Since it has basically the same configuration as the seismic isolation device according to the first embodiment, the same reference numerals are given to the corresponding portions, and detailed description thereof is omitted.

The seismic isolation device 1 according to the second and third embodiments has the same structure as the seismic isolation device according to the first embodiment, but also includes the inside of the cylindrical hollow portion 5 of the composite laminate 4. When the composite laminate 4 is deformed to a certain degree or more, a stopper 9 that comes into contact with the cylindrical member 7 and prevents further deformation is fixedly protruded upward from the lower plate 3. In addition, between the upper end of the stopper 9 and the upper surface plate 2, when the horizontal force at the time of the earthquake is equal to or less than a predetermined value, the displacement of the composite laminate 4 is restricted, and the horizontal force is set to a predetermined value. If it exceeds, a trigger mechanism 10 that allows the displacement of the composite laminate 4 is interposed.

In the second embodiment, as the trigger mechanism 10, a substantially gourd-shaped single metal body 11 whose upper and lower middle portions are formed in the narrowest diameter portion 11 a is formed by connecting the upper end of the stopper 9 to the upper surface plate 2. In the third embodiment, a concave portion 12 that opens downward is formed in the center of the upper surface plate 2, and a sphere 13 is elastically connected to the concave portion 12 via a spring 14 in the third embodiment. Is used.

In the seismic isolation device 1 according to the second embodiment and the third embodiment provided with the stopper 9 and the trigger mechanism 10 as described above, a normal time when no earthquake occurs, or even when an earthquake occurs. When the horizontal force is equal to or less than a predetermined value, the trigger mechanism 10 prevents the upper structure from being shaken by the influence of wind and the like, and the occupants may experience seasickness such as seasickness. It is possible to suppress the deterioration, and when the horizontal force exceeds a predetermined value, the trigger of the trigger mechanism 10 is automatically released, so that the displacement of the composite laminate 4 is allowed and the predetermined seismic isolation function is exhibited. I do. In addition, at the time of this seismic isolation function, it is possible to prevent the composite laminated body 4 from being excessively deformed and buckling due to the stopper 9 abutting on the cylindrical member 7.

In each of the above embodiments, when the viscous fluid 6 is filled and filled in the hollow portion 5 of the composite laminate 4, the viscous fluid 6 may be directly filled, but the hard plate 4a made of the viscous fluid may be used. Considering the corrosion of the hard laminate 4a and the elastic plate 4b in the composite laminate 4 and the leakage of the viscous fluid 6 to the outside in the composite laminate 4, an encapsulation pack separate from the composite laminate 4 was prepared. It is desirable that the pack be inserted into the hollow portion 5.

[0024]

As described above, according to the present invention, the composite laminate and the viscous fluid filled in the hollow portion of the composite laminate ensure a sufficient load supporting performance, and the composite laminate can be formed in response to an earthquake or the like. When deformed, not only the viscous resistance of the viscous fluid filled and filled in the hollow part, but also a large damping effect by the damping performance by the orifice effect that gives resistance to the flow of the viscous fluid moving in the hollow part Can be. Moreover, since the viscous fluid is used alone, there is no possibility that the elastic plate of the composite laminate is damaged at the time of an earthquake, unlike the case of using a hard granular material or a solid substance or using the viscous fluid together, Even during long-term continuous use after the occurrence of an earthquake, a predetermined damping effect can be ensured, and the effect of improving the durability of the entire device can be obtained.

In particular, when the stopper and the trigger mechanism are provided together as in claim 2, the composite laminate can be prevented from being excessively deformed and buckled due to the occurrence of an earthquake and the like, and can be protected from wind or the like during normal times. Under the influence, it is possible to suppress the deterioration of the habitability such as the swaying of the upper structure and the occupants becoming seasick.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a seismic isolation device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part in the first embodiment.

FIG. 3 is a longitudinal sectional view showing a seismic isolation device according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a seismic isolation device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Upper plate 3 Lower plate 4 Composite laminated body 5 Cylindrical hollow part 6 Viscous fluid 7 Tube member 8 Orifice hole 9 Stopper 10 Trigger mechanism

Claims (3)

[Claims] 1. A composite laminate comprising rigid plates and elastic plates alternately arranged and laminated in a plurality of stages between upper and lower face plates, and the composite laminate is provided at the center of the composite laminate. What is claimed is: 1. A seismic isolation device having a hollow portion penetrating a body in a stacking direction, wherein a hollow portion of the composite laminate is filled with a viscous fluid in a sealed state, and a composite laminate is formed in at least one location in the hollow portion. A seismic isolation device comprising a member having an orifice for providing resistance to the flow of the viscous fluid when the body is deformed. 2. A stopper is provided in the hollow portion of the composite laminate to prevent the composite laminate from deforming by a certain amount or more, and a horizontal gap between the stopper and one of the face plates during an earthquake is provided. When the force is equal to or less than a predetermined value, a trigger mechanism that regulates the displacement of the composite laminate and that allows the displacement of the composite laminate when the horizontal force exceeds a predetermined value is provided. The seismic isolation device according to claim 1, wherein: 3. The seismic isolation device according to claim 1, wherein the elastic plate in the composite laminate is made of high-damping rubber.