JPH11351324A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively exhibit the base isolating function even in a lightweight erection as a detached house in a base isolation device for suppressing the shaking of the erection to earthquake, and to simplify the structure to reduce the size and weight. SOLUTION: This device is provided with an upper plate 1 connected to an erection and a lower plate 2 connected to a foundation and consisting of a ferromagnetic material. A support column 4 is fixed to the lower surface of the upper plate 1 so as to extend downward, a magnet 6 for attracting the lower plate 2 and supporting the upper plate 1 together with the support column 5 in such a manner as to be horizontally relatively movable to the lower plate 2 is provided on the lower end part of the support column 5, and the whole circumferences of the upper plate 1 and the lower plate 2 are elastically connected to each other through a cylindrical rubber member 8 extending when the upper plate 1 is horizontally moved relatively to the lower plate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a seismic isolation device which is provided between a superstructure such as a building and a foundation and suppresses the vibration of the superstructure due to an earthquake.

[0002]

2. Description of the Related Art Conventionally, as a seismic isolation device of this kind,
For example, as shown in FIG. 9, a seismic isolation bearing in which a rubber layer c made of natural rubber or the like and a steel plate layer d are alternately stacked between a circular upper plate a and a lower plate b connected to an upper structure and a foundation, respectively. Rubber types are well known. This structure supports the load of the superstructure by the vertical rigidity of the laminated part, and against the roll in the event of an earthquake, the shear deformation of the rubber layer c and the damper action by the iron or lead plug e provided at the center part Thus, the horizontal displacement and the force are absorbed. In addition, there is a type in which the rubber e is attenuated by a hydraulic mechanism instead of the plug e, and a type in which the rubber layer c has a high attenuation so that the rubber itself exerts a damper function. The seismic isolation device of this seismic isolation bearing rubber type has a simple structure, and can easily predict the damping performance of seismic force in the design before construction, and also facilitates construction work and maintenance after construction. Therefore, it is widely used in large buildings such as large apartment houses and hospitals.

On the other hand, as a seismic isolation device for preventing a collapse of an earthquake, a fall of furniture and furniture, and a fall in a lightweight upper structure such as a private house, for example, Japanese Patent Application Laid-Open No. Hei 8-3263.
As disclosed in Japanese Patent Publication No. 52-52, a flexible structure is provided between a pair of upper and lower hard members, and a large number of compartments filled with a flow member are formed in the flexible structure, thereby simplifying the structure. It has been proposed that the structure of the superstructure be suppressed by an earthquake with a simple structure.

Further, in recent years, a seismic isolation device combining a slide mechanism such as a bearing and a damper mechanism without using rubber has been known. In this seismic isolation device, for example, two slide mechanisms are connected in a substantially cross shape. Thus, the upper structure can be freely moved in two horizontal directions with respect to the foundation, and a spring, an oil damper or the like is separately added to the slide mechanism to suppress the swing of the upper structure.

Further, as shown in, for example, Japanese Patent Application Laid-Open No. 9-4279, a steel ball is sandwiched from above and below by a parabolic circular steel plate support having a bottom at the center,
It has been proposed to suppress the roll of the upper structure by eliminating the seismic acceleration by the reaction force when the steel ball ascends the lower pan support.

[0006]

However, the conventional seismic isolation bearing rubber type described above has an expected shear force when the vertical load received from the upper structure is 50 to 100 kg / cm ^{2 in} terms of surface pressure. Because the cross-sectional area and the height are balanced so as to exhibit horizontal displacement and horizontal displacement, when applied to a private house with a light upper structure and a small installation area,
The cross-sectional area is small and the height is large, and the buckling is likely to occur and is unstable. For this reason, the seismic isolation bearing of the seismic isolation bearing type is actually used only for large buildings such as large apartment houses and hospitals.

In addition, the former proposal example (Japanese Patent Laid-Open No. 8-32)
In the seismic isolation device disclosed in Japanese Patent No. 6352), the strength of the flexible structure for supporting the load from the upper structure decreases due to aging, and the height of the upper structure cannot be kept constant. There's a problem. In addition, it is difficult to provide a plurality of compartments inside for manufacturing.

[0008] In a seismic isolation device combining a slide mechanism and a damper mechanism without using rubber, the structure of the slide mechanism and the damper mechanism is required in order to function against seismic force from any direction. Has become very complicated, and the difficulty in designing prior to construction and high cost have become problems, and it has not been widely used.

Further, the latter proposed example (Japanese Patent Laid-Open No. 9-4)
In the seismic isolation device disclosed in Japanese Patent No. 279), there is a problem that the steel structure moves on the parabolic dish cradle in response to the roll due to the earthquake, so that the upper structure also moves in the vertical direction. In addition, since the mechanism for damping the vibration is based on gravity, the upper structure has a vibration behavior close to free vibration, and there is a problem that the vibration is not well controlled.

The present invention has been made in view of the above points, and an object of the present invention is to provide a conventional seismic isolation device which suppresses shaking of an upper structure due to an earthquake. In this way, even when the superstructure such as a private house is lightweight, there is no vertical displacement due to earthquake vibration, and it responds to and absorbs lateral displacement and is effectively exempted. It can exert its seismic function,
In addition, an object of the present invention is to make the structure simple and to reduce the size and weight.

[0011]

In order to achieve the above object, according to the present invention, a support column is fixed to the lower surface of an upper plate so as to extend downward, and a lower end of the support column is provided with a ferromagnetic material. A magnet is provided to attract the lower plate made of the material and to support the upper plate together with the support columns so that the upper plate can move relative to the lower plate in the horizontal direction. The outer peripheral portions of the upper plate and the lower plate are elastically connected to each other by the elastic body that extends.

More specifically, the invention of claim 1 is directed to a seismic isolation device which is provided between an upper structure and a foundation and suppresses shaking of the upper structure due to an earthquake.

An upper plate connected to the upper structure; a lower plate provided opposite the lower side of the upper plate and connected to the base and made of a ferromagnetic material; A support column fixed to the lower surface other than the outer peripheral portion so as to extend downward, and the lower plate is attracted to the lower end of the support column, and the upper plate together with the support column is horizontally opposed to the lower plate. The magnet provided so as to be movably supported, and at least a part of the outer peripheral portion of the upper plate and the lower plate are elastically connected to each other, and the upper plate is horizontally moved relative to the lower plate. And an elastic body that extends when moved.

According to the above configuration, since the upper plate is supported by the supporting columns and the magnets with respect to the lower plate, it is possible to stably maintain the height of the upper structure, unlike the case where the upper plate is supported by rubber. it can. Then, when an earthquake occurs, the upper plate moves in the horizontal direction with respect to the lower plate, and the sudden vibration is lengthened and softened. At this time, the elastic body generates a restoring force for returning the upper plate to the position before the movement by extending, and this restoring force acts as a damping force together with a force (magnetic force) for attracting the lower plate of the magnet. Therefore, the swing of the upper structure can be suppressed without moving the upper structure up and down,
After the convergence of the earthquake, the upper plate or superstructure can be returned to the position before the movement. Further, even if a minute earthquake motion occurs or wind pressure acts on the upper structure, the upper plate can be prevented from moving by the magnet's lower plate attracting force.

According to a second aspect of the present invention, in the first aspect of the invention, the elastic body is a cylindrical rubber which connects the entire outer periphery of the upper plate and the lower plate and covers a space between the upper plate and the lower plate. It shall consist of members. Thus, regardless of the direction in which the upper plate moves, the cylindrical rubber member expands accordingly and a stable restoring force with no directivity is generated.

According to a third aspect of the present invention, in the second aspect of the present invention, an attenuator made of a liquid viscous material or a powdery or granular polymer material is provided in a space between the upper plate and the lower plate covered with the rubber member. Is filled.

By doing so, a relatively large damping force can be easily obtained without leaking the damping agent to the outside of the cylindrical rubber member, and the damping force is adjusted by changing the material and amount of the damping agent. be able to. For this reason, by reducing the magnetic force of the magnet, the upper plate can be moved relative to the lower plate as smoothly as possible in the event of an earthquake, and the rapid vibration of the upper structure can be suppressed more effectively. Can be. Further, the swing of the upper structure due to the wind pressure can be easily suppressed by the damping agent and the magnet. Therefore, it is possible to surely exert the seismic isolation effect against large ground vibrations while suppressing inadvertent shaking of the upper structure.

According to a fourth aspect of the present invention, in the second or third aspect of the invention, the rubber member has a thickness change portion near the upper and lower ends, the thickness of which changes gradually toward the opposite side to the center in the vertical direction. The thickness change portion has a shape that changes smoothly from the thin portion to the thick portion.

[0019] With this, the thickness of the upper and lower ends of the rubber member can be made thicker than the central portion in the vertical direction, so that the rubber member can be easily and reliably joined to the upper plate and the lower plate while performing predetermined bonding. The shape can provide a restoring force.
At this time, if the thickness is rapidly changed in the thickness change portion, a large step is generated, so that when the upper plate moves relatively to the lower plate in the horizontal direction, stress concentration occurs in the thickness change portion. The rubber member is easily broken. However, in the present invention, since the thickness change portion has a smoothly changing shape, stress concentration can be reduced, and breakage due to stress concentration at the thickness change portion of the rubber member can be prevented.

According to a fifth aspect of the present invention, in the first aspect of the invention, the elastic body is a plurality of coil springs which are wound around the outer peripheral portions of the upper plate and the lower plate at substantially equal intervals in the circumferential direction. Shall be. According to the present invention, substantially the same restoring force can be generated by the entire coil spring regardless of the direction in which the upper plate moves in the horizontal direction with respect to the lower plate.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a seismic isolation device A according to an embodiment of the present invention. The seismic isolation device A is provided between an upper structure such as a building and a foundation, and the upper structure against earthquakes. In particular, when the upper structure is lightweight, such as in a private house, it exerts its seismic isolation effect. The seismic isolation device A includes a circular iron upper plate 1 connected to the upper structure, and an iron upper plate 1 provided facing the lower side of the upper plate 1 and connected to the base and made of iron as a ferromagnetic material. Circular lower plate 2 made of base material
And The upper plate 1 and the lower plate 2 have outer peripheral members 1 a, which constitute the outer peripheral portions of the upper plate 1 and the lower plate 2, respectively.
2a, and inner peripheral members 1b, 2b respectively constituting radially inner portions of the outer peripheral members 1a, 2a. Both members 1a, 1b of the upper plate 1 and both members 2a, 2 of the lower plate 2 are formed.
b is concentrically and firmly connected to each other by screws or bolts (not shown) at portions formed in steps.

At the center of the lower surface of the inner peripheral side member 1b of the upper plate 1, the upper end of a substantially columnar supporting column 5 extending downward is attached and fixed with an adhesive or a bolt. A permanent magnet 6 for attracting the lower plate 2 is provided between the lower end of the support column 5 and the upper surface of the lower plate 2. This magnet 6
The support column 5 has a disk shape having substantially the same diameter as that of the support column 5, and is concentrically attached and fixed to the lower end of the support column 5 with an adhesive or a bolt. The magnet 6 is machined so that its lower surface is mirror-like, and when an earthquake of a predetermined seismic intensity or more occurs, the magnet 6 moves on the lower plate 2 against the attraction force of the lower plate 2. It is slippery. That is, the magnet 6 is configured to support the upper plate 1 together with the support column 5 so as to be relatively movable in the horizontal direction with respect to the lower plate 2.

The entire periphery of the outer peripheral members 1a and 2a constituting the outer peripheral portions of the upper plate 1 and the lower plate 2 is formed by a cylindrical rubber member 8 (elastic) that covers the space between the upper plate 1 and the lower plate 2. Body). This rubber member 8 generates a restoring force that extends when the upper plate 1 slides in any direction in the horizontal direction relative to the lower plate 2 and returns the upper plate 1 to the position before the sliding. It has become. This rubber member 8
Is made of a compounded rubber mainly composed of natural rubber or synthetic rubber, or a composite material in which any of the compounded rubbers is reinforced with fibers. The rubber member 8 has thickness changing portions 8a, 8a near the upper and lower end portions where the thickness changes in a direction opposite to the center in the vertical direction, and the thickness at the upper and lower ends is greater than that at the center in the vertical direction. Is also formed thick. This thickness change portion 8
a, 8a are formed in an arc shape so as to smoothly change from a thin portion (central portion in the vertical direction) to a thick portion (both upper and lower ends), and the upper plate 1 is arranged in a horizontal direction with respect to the lower plate 2. The stress concentration is alleviated when relatively moved. Further, concave portions 8b formed on both upper and lower end surfaces of the rubber member 8,
8b are the upper plate 1 and the lower plate 2
The outer peripheral members 1a and 2a are vulcanized and bonded to the entire periphery of the opposing surface and the outer peripheral surface, respectively, so that the space between the upper plate 1 and the lower plate 2 is substantially sealed.

The space between the upper plate 1 and the lower plate 2 covered with the rubber member 8 is filled with an attenuator 10 made of a liquid viscous material or a powdery or granular polymer material.

The method of assembling the seismic isolation device A having the above configuration will be described with reference to FIG. First, the outer peripheral members 1a, 2a of the upper plate 1 and the lower plate 2 are inserted into the concave portions 8b on both upper and lower end surfaces of the rubber member 8.
a, and the entire circumference of the horizontal plane and the vertical plane of each of the concave portions 8b is vulcanized and bonded to the opposing surfaces and the entire outer circumference of the outer peripheral members 1a, 2a.

Subsequently, the inner peripheral side member 1b of the upper plate 1 to which the support column 5 and the magnet 6 are attached and fixed on the lower surface in advance is replaced with the outer peripheral side member 1a.
Then, the top and bottom are turned upside down so that the upper plate 1 is on the lower side.

Next, after filling the inside of the rubber member 8 with the attenuating agent 10, the inner peripheral member 2b of the lower plate 2 is joined to the outer peripheral member 2a by screws or bolts, like the upper plate 1. As a result, the seismic isolation device A is completed.

When the seismic isolation device A is provided between a pillar or the like constituting the upper structure and the foundation, the upper structure or the upper plate 1
Is supported by the support columns 5 and the magnets 6, so that the height of the superstructure does not change with aging. Also, even if a small earthquake motion occurs or wind pressure acts on the upper structure, the movement of the upper plate 1 can be prevented by the flow resistance of the damping agent 10 and the attraction of the lower plate 2 of the magnet 6. it can. Furthermore, if the upper plate 1 and the upper structure are connected so that the load of the upper structure is applied to the center of the upper plate 1, the upper structure can be stably supported. Then, when an earthquake of a predetermined seismic intensity or more occurs, the magnet 6 slides on the lower plate 2 and the upper plate 1 and the supporting column 5 move horizontally relative to the lower plate 2 regardless of the seismic force in any direction. I do.

At this time, since the upper plate 1 is displaced in the horizontal direction, the rubber member 8 is deformed and expanded in that direction, and a restoring force is generated in the rubber member 8 to return the upper plate 1 to the position before the movement. This restoring force acts as a damping force together with the flow resistance force of the damping agent 10 and the attraction force of the lower plate 2 of the magnet 6. As a result, horizontal shaking can be suppressed without moving the upper structure up and down, and it is possible to prevent the object installed inside the building from falling down. Moreover, after the convergence of the earthquake, the upper plate 1 or the upper structure can be returned to the position before the movement. Further, the restoring force of the rubber member 8 depends on the material of the rubber member 8,
Depending on the size, cross-sectional shape, etc., the resistance of the damping agent 10 changes depending on the material and amount of the damping agent 10 used, and the attraction force of the lower plate 2 of the magnet 6 changes depending on the magnetic force of the magnet 6, the material of the lower plate 2 and the like. And can be set to an optimum value according to the weight of the superstructure. Further, the rubber member 8 generates the same restoring force when the upper plate 1 moves in any direction in the horizontal direction with respect to the lower plate 2, so that the rubber member 8 functions in the same manner against seismic force from any direction. Can be done.

In the above-described embodiment, the space between the upper plate 1 and the lower plate 2 covered with the rubber member 8 is filled with the attenuating agent 10, but the attenuating agent 10 is not necessarily required. It is also possible to respond by adjusting the plate 2 attraction force. However, when the damping agent 10 is used as in the above embodiment, the upper plate can be more smoothly moved relative to the lower plate at the time of an earthquake by reducing the magnetic force of the magnet 6. Abrupt shaking of the structure can be suppressed more reliably, and shaking due to wind pressure of the upper structure can be easily suppressed by the damping agent and the magnet.

In the above embodiment, the rubber member 8 is adhered to the outer peripheral members 1a and 2a of the upper plate 1 and the lower plate 2, but may be joined by bolts or screws. Then, in order to more strongly join the rubber member 8 to the upper plate 1 and the lower plate 2, the upper and lower ends of the rubber member 8 are fastened to the upper plate 1 and the lower plate 2 by fastening bands reinforced with metal or fiber. You may make it each tighten to the side peripheral surface of the outer peripheral side member 1a, 2a.

Further, in the above-described embodiment, the thickness change portions 8a, 8a and the recesses 8b, 8b are formed at the upper and lower ends of the rubber member 8. However, as shown in FIG. The upper and lower end surfaces may be kept constant, and the entire periphery of both end surfaces of the rubber member 8 may be vulcanized and bonded to the entire periphery of the opposing surfaces of the outer peripheral members 1a and 2a of the upper plate 1 and the lower plate 2, respectively. As shown in FIG. 5, the entire periphery of the inner peripheral surface of the upper and lower ends of the rubber member 8 may be vulcanized and bonded to the entire periphery of the outer peripheral surfaces of the outer peripheral members 1a and 2a. However, when the thickness is reduced due to the restoring force of the rubber member 8, it is better to make the shape as in the first embodiment above, while maintaining the necessary restoring force and the rubber member 8 and the upper plate 1. Adhesion with the lower plate 2 can be performed more reliably and easily. And even if it has the thickness change portions 8a, 8a,
Since a and 8a are formed in a shape that can relieve stress concentration, it is possible to prevent breakage due to stress concentration at the thickness change portions 8a and 8a of the rubber member 8.

In the above embodiment, the upper plate 1 and the lower plate 2 are respectively connected to the outer peripheral members 1a, 2a and the inner peripheral members 1b,
2b and 2b, but may be polygonal, and the upper plate 1 and the lower plate 2 may each be formed by one member. However, from the viewpoint of improving the assemblability, it is desirable to configure two members as in the above embodiment.
Then, the support column 5 may be integrally formed with the upper plate 1 (the inner peripheral side member 1b).

Further, the material of the upper plate 1 may be a metal other than iron, and a high-rigidity material such as reinforced plastic may be used. The lower plate 2 may be made of any material as long as it is a ferromagnetic material attracted to the magnet 6 and can support the upper structure.

In the above-described embodiment, the support column 5 and the magnet 6 are fixed to the center of the lower surface of the inner peripheral member 1b of the upper plate 1. If
The support column 5 and the magnet 6 may be mounted and fixed on any lower surface other than the outer peripheral portion of the upper plate 1, that is, the lower surface of the inner peripheral side member 1b.

Further, although an electromagnet may be used instead of the permanent magnet 6, the permanent magnet 6 is more preferable in consideration of the size, the necessity of wiring and a power supply, and the like.

In addition, in the above embodiment, the rubber member 8 is used as the elastic body. However, for example, a coil spring may be used. That is, as shown in FIG. 6, a plurality of spring support portions 1c, 1 are provided on the outer peripheral side members 1a, 2a of the upper plate 1 and the lower plate 2 at substantially equal intervals in the circumferential direction.
.., 2c, 2c,... are respectively provided above and below the upper plate 1 and the lower plate 2, and coil springs 15 as elastic bodies are respectively applied to the respective spring support portions 1c, 2c corresponding to the upper and lower portions of the upper plate 1 and the lower plate 2. hand over. In this manner, as in the case where the rubber member 8 is used, the coil springs 15, 15,... Generate substantially the same restoring force regardless of the direction in which the upper plate 1 moves relative to the lower plate 2 in the horizontal direction. In addition, since the restoring force of each coil spring 15 can be easily adjusted, the same operation and effect as when the damping agent 10 is not used in the above embodiment can be obtained.

[0038]

Next, a specific embodiment will be described. Four seismic isolation devices A are manufactured in the same manner as in the above embodiment, and each of the seismic isolation devices A is connected to each pillar 22 located at the four corners of a private house (upper structure 21) as shown in FIG. It was provided between each pillar 22 and each foundation 23 (only one pillar 22 is shown in FIG. 7). Each of these basics 2
Numeral 3 is placed on a plurality of rollers (not shown) for the test, and it is possible to apply vibration to each of the foundations 23 in the horizontal direction and shake them. Here, the horizontal spring constant of each of the seismic isolation devices A is 45 kgf / cm,
The horizontal damping coefficient was 34 kgf · s / cm. The weight of the upper structure 21 was set to 40 t, which is almost the same as that of a general wooden house.

Then, seismic waves observed in the Hyogoken-Nanbu Earthquake were input horizontally to each of the foundations 23, and the vibration damping effect of the upper structure 21 was examined. As a result, the maximum acceleration of the upper structure 21 in the horizontal direction was reduced to about 1/4, and it was confirmed that the seismic isolation effect was sufficiently exhibited.

Next, the seismic isolation effect when each of the seismic isolation devices A was applied to a seismic isolation floor was examined. That is, as shown in FIG. 8, each of the seismic isolation devices A is provided at four corners between a floor member 26 as an upper structure and a foundation 23 installed on a plurality of rollers. The same seismic wave as the test was input. As a result, it was found that each of the seismic isolation devices A had a sufficient seismic isolation effect even when used as a seismic isolation floor, and was applicable to seismic isolation floors such as precision machine rooms and computer rooms inside buildings. Was.

[0041]

As described above, according to the first aspect of the present invention, the lower plate is attracted to the lower end of the support column, and the upper plate together with the support column can be moved relative to the lower plate in the horizontal direction. A magnet is provided so as to support, and at least a part of the outer peripheral portions of the upper plate and the lower plate is elastically connected by an elastic body that extends when the upper plate moves in a horizontal direction relatively to the lower plate. With a simple configuration, a compact and lightweight seismic isolation device that can effectively exhibit the horizontal seismic isolation function that absorbs and absorbs horizontal vibrations without raising or lowering even a lightweight superstructure is obtained. Can be Also, the lower plate attracting force of the magnet can prevent the upper structure from swinging due to wind pressure.

According to the second aspect of the present invention, the elastic body is a cylindrical rubber member that connects the entire outer circumferences of the upper plate and the lower plate and covers the space between the upper plate and the lower plate. Further, in the invention of claim 5, the elastic body is a plurality of coil springs that are wound around the outer peripheral portions of the upper plate and the lower plate at substantially equal intervals in the circumferential direction.
Therefore, according to these inventions, the damping force and the restoring force can be secured without being affected by the direction of the seismic force.

According to the third aspect of the present invention, the space between the upper plate and the lower plate covered with the rubber member is filled with a damping agent made of a liquid viscous material or a powdery or granular polymer material. In addition to making it easy to suppress inadvertent shaking due to the wind pressure of the upper structure, it is possible to reliably exert the seismic isolation effect against large ground vibrations.

According to the fourth aspect of the present invention, the vicinity of the upper and lower ends of the rubber member is made thicker, and gradually becomes thinner toward the center in the up-down direction. Thus, a predetermined restoring force can be obtained while alleviating the stress concentration, and seismic isolation performance can be ensured for a long period of time.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the seismic isolation device.

FIG. 3 is an exploded view showing an assembling procedure of the seismic isolation device.

FIG. 4 is a view corresponding to FIG. 1 showing another example of bonding the rubber member to the outer peripheral side members of the upper plate and the lower plate.

FIG. 5 is a view corresponding to FIG. 1, showing still another example of bonding the rubber member to the outer peripheral members of the upper plate and the lower plate.

FIG. 6 is a view corresponding to FIG. 1, showing another embodiment using a coil spring as an elastic body.

FIG. 7 is a schematic diagram showing a procedure of a test for applying the seismic isolation device to a private house and examining its seismic isolation effect.

FIG. 8 is a schematic diagram showing a procedure of a test for applying a seismic isolation device to a seismic isolation floor and examining the seismic isolation effect thereof.

FIG. 9 is a cross-sectional view showing a conventional seismic isolation bearing rubber type seismic isolation device.

[Explanation of symbols]

 A seismic isolation device 1 upper plate 2 lower plate 5 support column 6 magnet 8 rubber member (elastic body) 10 damping agent 15 coil spring (elastic body) 21 upper structure 23 foundation 26 floor member (upper structure)

Claims (5)

[Claims] 1. A seismic isolation device provided between an upper structure and a foundation, wherein the upper structure is connected to the upper structure, wherein the upper plate is connected to the upper structure. A lower plate, which is provided facing the lower side of the upper plate, is connected to the foundation, and is made of a ferromagnetic material; and a support column fixed to the lower surface other than the outer peripheral portion of the upper plate so as to extend downward. A magnet provided so as to attract the lower plate to the lower end of the support column and to support the upper plate together with the support column so as to be relatively movable in the horizontal direction with respect to the lower plate; An elastic body that elastically connects at least a part of an outer peripheral portion of the plate and extends when the upper plate moves in a horizontal direction relative to the lower plate. Quake device. 2. The seismic isolation device according to claim 1, wherein the elastic body is a cylindrical rubber member that connects the entire outer periphery of the upper plate and the lower plate and covers a space between the upper plate and the lower plate. A seismic isolation device characterized by becoming. 3. The seismic isolation device according to claim 2, wherein the space between the upper plate and the lower plate covered with the rubber member is filled with an attenuator made of a liquid viscous material or a powdery or granular polymer material. A seismic isolation device characterized in that it is being used. 4. The seismic isolation device according to claim 2, wherein the rubber member has a thickness changing portion near the upper and lower ends, the thickness changing portion increasing in thickness toward a side opposite to the center in the vertical direction. The seismic isolation device characterized in that the thickness change portion has a shape that changes smoothly from a thin portion to a thick portion. 5. The seismic isolation device according to claim 1, wherein the elastic body is a plurality of coil springs wound around the outer peripheral portions of the upper plate and the lower plate at substantially equal intervals in the circumferential direction. Characteristic seismic isolation device.