JPH11153187A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently display a base isolation function even when an upper structure is light as a private housing, etc., and to miniaturize and lighten it in simple structure for a base isolation device devised to restrain swinging of an upper part structure against an earthquake. SOLUTION: It is furnished with an upper plate 1 connected to an upper part structure, a lower plate 2 provided against a lower side of the upper plate 1 and to be connected to a foundation, a support pillar 5 fixed so as to extend in the vertical direction on a lower surface except for an outer peripheral part of the upper plate 1 and a sliding member 6 provided on a lower end part of this support pillar 5 free to slide the aforementioned upper plate 1 with the support pillar 5 against the lower plate 2 relatively in the horizontal direction, and outer peripheral part overall peripheries of the upper plate 1 and the lower plate 2 are elastically connected to each other by a cylindrical rubber member 8 which extends when the upper plate 1 slides relatively in the horizontal direction against the lower plate 2 are elastically connected to each other.

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 rubber type in which a rubber c made of natural rubber or the like and a steel plate d are alternately laminated between a circular upper plate a and a lower plate b connected to an upper structure and a foundation, respectively. Is well known. This one is
The vertical stiffness of the laminated part containing rubber c supports the load of the upper structure, and against the roll in the event of an earthquake, the low shearing force of rubber c is used, and at the same time an iron or lead plug e provided at the center
The horizontal force is absorbed by the damping action of the stiffener. In addition, there is a type in which a damping function is provided by a hydraulic mechanism instead of the plug e, and a type in which the rubber c is made to have a high attenuation so that the rubber c 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, there is provided a support column fixed to a lower surface other than an outer peripheral portion of an upper plate so as to extend downward, and a lower end portion of the support column. And a sliding member provided on at least one of the upper surface of the lower plate and supporting the upper plate together with the support column so as to be slidable relative to the lower plate in a horizontal direction. At least a part of the outer peripheral portions of the upper plate and the lower plate are elastically connected to each other by an elastic body that is extended when sliding in a horizontal direction relative to the lower plate.

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.

[0013] An upper plate connected to the upper structure, a lower plate provided to face the lower side of the upper plate and connected to the foundation, and a lower surface other than an outer peripheral portion of the upper plate. A support column fixed so as to extend in a downward direction, provided on at least one of the lower end portion of the support column and the upper surface of the lower plate, and the upper plate together with the support column relative to the lower plate. A sliding member slidably supported in a horizontal direction, and at least a part of an outer peripheral portion of the upper plate and the lower plate are elastically connected to each other, so that the upper plate is relatively horizontal to the lower plate. And an elastic body that extends when sliding.

According to the above configuration, since the upper plate is supported by the support pillar with respect to the lower plate, the height of the upper structure can be stably maintained, unlike the case where the upper plate is supported by rubber. When an earthquake occurs, the upper plate smoothly slides in the horizontal direction with respect to the lower plate due to the sliding contact surfaces of the support columns. At this time, the elastic body generates a restoring force that returns the upper plate to the position before sliding by extending, and this restoring force acts as a damping force together with the frictional force acting on the sliding contact surface. Therefore, the swing of the upper structure can be suppressed without moving the upper structure up and down, and the upper plate or the upper structure can be returned to the position before sliding after the convergence of the earthquake. Also,
Since the restoring force of the elastic body and the frictional force of the sliding contact surface can be adjusted, they can be set to be optimal values according to the weight of the upper structure.

According to a second aspect of the present invention, in the first aspect of the invention, the sliding member is fixed to a lower end portion of the support column. Thereby, it is not necessary to set the horizontal size of the sliding member in consideration of the amount of movement of the upper plate, and the size can be made smaller than when fixed to the lower plate.
It is also advantageous in terms of cost.

According to a third aspect of the present invention, in the first or second aspect, the sliding member is made of a lubricating resin. Thereby, a preferable form of the sliding member having good slidability is obtained. It is more preferable that the sliding member has a high compressive strength and a small change with time in the sliding property.

According to the invention of claim 4, according to claim 1, 2, or 3
In the invention, the elastic body is formed of 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. With this configuration, regardless of the direction in which the upper plate moves, the cylindrical rubber member expands accordingly and generates a stable restoring force without directivity.

According to a fifth aspect of the present invention, in the fourth 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. Further, even if a small earthquake motion occurs or a large wind pressure acts on the upper structure as in a typhoon, the movement of the upper plate can be prevented by the resistance force of the damping agent. 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 sixth aspect of the present invention, in the invention of the fourth or fifth aspect, the rubber member has a thickness changing 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.

[0021] 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 the seventh aspect of the present invention, the first, second or third aspect of the present invention is provided.
In the present invention, 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. 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.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIGS.
1 shows a seismic isolation device A according to a first embodiment of the present invention. The seismic isolation device A is provided between an upper structure such as a building and a foundation so as to suppress shaking of the upper structure due to an earthquake. It exhibits its seismic isolation effect particularly when the upper structure is lightweight, such as a private house. The seismic isolation device A is provided opposite a circular steel upper plate 1 connected to the upper structure, and a lower side of the upper plate 1.
It has a lower circular plate 2 made of steel which is connected to the foundation so that the upper and lower surfaces are horizontal. The upper plate 1 and the lower plate 2 have outer peripheral members 1a and 2a forming the outer peripheral portions of the upper plate 1 and the lower plate 2 and the inner peripheral members forming the radially inner portions of the outer peripheral members 1a and 2a, respectively. Side members 1b, 2b
The two members 1a and 1b of the upper plate 1 and the lower plate 2
The two members 2a and 2b are firmly connected concentrically by screws or bolts (not shown) at portions formed in a stepped shape with each other.

At the center of the lower surface of the inner peripheral member 1b of the upper plate 1, the upper end of a substantially cylindrical steel supporting column 5 extending downward is fixedly attached by means of adhesive or bolts. Between the lower end of the support column 5 and the upper surface of the lower plate 2, the upper plate 1 can be slid in a horizontal direction relative to the lower plate 2 together with the support column 5, and A sliding member 6 for supporting the lower surface to be horizontal is provided. The sliding member 6 is made of a resin having a high compressive strength and self-lubricating properties (for example, a fluororesin) or a lubricating resin having a low friction coefficient by a solid lubricant or a reinforcing fiber. It has the shape of a disk having the same diameter, and is attached and fixed concentrically to the lower end of the support column 5 by means of adhesive or bolts. That is, the sliding member 6 is also arranged at the center of the upper plate 1.

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. Further, the rubber member 8 has thickness changing portions 8a, 8a in the vicinity of both upper and lower ends, the thickness of which changes gradually toward the opposite side to the center in the vertical direction. It is formed thicker than that. This thickness change portion 8
Reference numerals a and 8a each have a shape that smoothly changes from a thin portion (the center in the vertical direction) to a thick portion (the upper and lower ends). That is, the upper plate 1 is formed in an arc shape having a relatively large radius of curvature, so that the stress concentration of the thickness change portions 8a, 8a is reduced when the upper plate 1 moves relative to the lower plate 2 in the horizontal direction. I have. Further, on the inner peripheral sides of both upper and lower end surfaces of the rubber member 8, bonding portions 8 b, 8 b having a horizontal surface and a vertical surface are formed to be recessed toward the center in the vertical direction.
The outer peripheral side members 1a and 2a of the upper plate 1 and the lower plate 2 are fitted into b and 8b, respectively. The entire horizontal and vertical surfaces of the bonding portions 8b, 8b at the upper and lower end surfaces of the rubber member 8 are vulcanized to the opposing surfaces and the entire peripheral surfaces of the outer peripheral members 1a, 2a of the upper plate 1 and the lower plate 2, respectively. Glued.
Thus, the space between the upper plate 1 and the lower plate 2 is made substantially closed, and the bonding between the rubber member 8 and the upper plate 1 and the lower plate 2 is ensured.

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 1 of the upper plate 1 and the lower plate 2 are attached to the bonding portions 8b, 8b on both upper and lower end surfaces of the rubber member 8.
a and 2a are fitted respectively, and the entire horizontal and vertical surfaces of the bonding portions 8b and 8b are vulcanized and bonded to the opposing surfaces and the entire peripheral surfaces of the outer peripheral members 1a and 2a, respectively.

Subsequently, the inner peripheral side member 1b of the upper plate 1, to which the support pillar 5 and the sliding member 6 are previously attached and fixed to the lower surface, is connected to the outer peripheral side member 1a by screws, bolts, or the like. The upper plate 1 is placed on the lower side.

Next, after the rubber member 8 is filled 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 the pillars 22 and the foundation 23 located at the four corners of the upper structure 21 in a private house, as shown in FIG. 4, for example, The upper plate 1 is supported by the supporting columns 5 and the sliding members 6, and the sliding members 6 are made of a lubricating resin having a high compressive strength and a low coefficient of friction. It will not change. Further, even if a small earthquake motion occurs or a large wind pressure acts on the upper structure 21 as in a typhoon, the sliding of the upper structure 21 or the upper plate 1 is prevented by the resistance force of the damping agent 10. be able to. Further, the support column 5 and the sliding member 6 are
Of the upper plate 2 so that the load of each column 22 of the upper structure 21 is applied to the center of the upper plate 1.
1 and each column 22, the upper structure 21 can be stably supported, and the upper plate 1 is relative to the lower plate 2 regardless of the direction of the seismic force when an earthquake occurs. Sliding smoothly.

At this time, since the upper plate 1 is displaced in the horizontal direction, the rubber member 8 is deformed and extended in that direction, and a restoring force is generated in the rubber member 8 to return the upper plate 1 to the position before sliding. . This restoring force acts as a damping force together with the deformation resistance of the damping agent 10. As a result, horizontal shaking can be suppressed without moving the upper structure 21 up and down, and it is possible to prevent an object installed inside the house from falling down. Moreover, after the convergence of the earthquake, the upper plate 1 or the upper structure 21
Can be returned to the position before sliding. Further, the restoring force of the rubber member 8, the resistance force of the damping agent 10, and the maximum horizontal movement amount of the upper plate 1 are determined by the material, size, cross-sectional shape, etc. of the rubber member 8, the material of the damping agent 10, and the amount used, respectively. Since it can be adjusted by changing, it can be set to an optimum value according to the weight of the upper structure 21. In addition, the rubber member 8 generates the same restoring force when the upper plate 1 slides in any direction in the horizontal direction with respect to the lower plate 2, so that the same applies to the seismic force from any direction. Can work.

Furthermore, even in the event of an unexpectedly large earthquake, the sliding member 6 is brought into contact with the inner peripheral surface of the rubber member 8 to restrict excessive movement of the upper plate 1. Can be. In addition, as shown in FIG.
When applied to a seismic isolation floor, that is, when the seismic isolation device A is provided at the four corners between the floor member 26 as an upper structure and the foundation 23, a sufficient seismic isolation effect can be obtained, and precision machinery inside the building can be obtained. It can be applied to base-isolated floors in rooms and computer rooms.

In the first embodiment, an attenuator 10 made of a liquid viscous material or a powdery or granular polymer material is used in the space between the upper plate 1 and the lower plate 2 covered with the rubber member 8. However, the attenuator 10 is not always necessary,
It is possible to cope with this by changing the coefficient of friction with the lower plate 2 according to the material and surface roughness of the sliding member 6 and adjusting the frictional force.

In the first embodiment, the rubber member 8 is bonded 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, the rubber member 8 is further firmly fixed to the upper plate 1.
Upper and lower ends of the rubber member 8 are fastened to the outer peripheral members 1a and 2a of the upper plate 1 and the lower plate 2 by fastening bands reinforced with metal or fiber. You may do so.

Further, in the first embodiment, the rubber member 8
Thickness changing portions 8a, 8a and bonding portions 8b, 8
b was formed, for example, as shown in FIG.
The thickness of the rubber member 8 is made constant between the upper and lower end surfaces, and the entire periphery of both end surfaces of the rubber member 8 is formed on the outer peripheral side members 1a, 2a of the upper plate 1 and the lower plate 2.
May be vulcanized and bonded to the entire circumference of the opposing surface in FIG. 7, and as shown in FIG. 7, the entire circumference of the inner peripheral surface of the upper and lower ends of the rubber member 8 is the entire circumference of the outer peripheral members 1a and 2a. May be vulcanized and bonded. However, the rubber member 8
In the case where the wall thickness is reduced due to the restoring force of the rubber member 8, the rubber member 8 and the upper plate 1 and the lower plate 2 can maintain the required restoring force while maintaining the required restoring force. Bonding can be performed more reliably and easily. And
Even if the rubber member 8 has the thickness change portions 8a, 8a, the thickness change portions 8a, 8a are formed in a shape capable of relieving stress concentration. Breakage due to stress concentration can be prevented.

(Embodiment 2) FIG. 8 shows Embodiment 2 of the present invention.
(In the following embodiments, the same parts as those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted), and an elastic body that elastically connects outer peripheral portions of the upper plate 1 and the lower plate 2 to each other. Is different.

That is, in this embodiment, a plurality of spring support portions 1c, 1c, are provided on the outer peripheral members 1a, 2a of the upper plate 1 and the lower plate 2 at substantially equal intervals in the circumferential direction.
, 2c, 2c,... Are provided corresponding to each other in the upper and lower directions, and coil springs 15 as elastic bodies are respectively extended over the respective spring support portions 1c, 2c corresponding to the upper and lower sides of the upper plate 1 and the lower plate 2. Have been. That is, the plurality of coil springs 15, 15,...
This means that the wires 2a are laid at substantially equal intervals in the circumferential direction between 2a. Each of the coil springs 15 corresponds to the first embodiment.
Like the rubber member 8, the upper plate 1 extends in any direction in the horizontal direction with respect to the lower plate 2 to generate a restoring force for returning the upper plate 1 to the position before the sliding. It has become. Unlike the first embodiment, the damping agent 10 is not used due to its structure.

Therefore, in the second embodiment, the plurality of coil springs 15, 15,... Are arranged at equal intervals in the circumferential direction, and a part of the outer peripheral members 1a, 2a of the upper plate 1 and the lower plate 2 are connected to each other. .. Are resiliently connected to each other so that the coil springs 15, 15,. Since the force can be generated and the restoring force of each coil spring 15 can be easily adjusted, the same operation and effect can be obtained as in the case where the damping agent 10 is not used in the first embodiment.

In each of the above embodiments, the upper plate 1 and the lower plate 2 are connected to the outer members 1a and 2a and the inner members 1b and 1b, respectively.
2b is made of circular steel, but a highly rigid material such as reinforced plastic may be used, and the present invention can be applied to a polygonal shape. Then, the upper plate 1 and the lower plate 2 may each be constituted by one member. However, in particular, in the case of the first embodiment, it is desirable to configure the two members as described above from the viewpoint of improving the assemblability. Further, the support column 5 may be integrally formed with the upper plate 1 (the inner peripheral side member 1b).

In each of the above embodiments, the sliding member 6 made of a lubricating resin is fixed to the support column 5.
The present invention can be applied to any other resin or metal as long as the resin and metal are surely supported and have good slidability. Then, a sliding member 6 having substantially the same size as the lower plate 2 may be attached and fixed to the upper surface of the lower plate 2 so that the support column 5 slides on the upper surface of the sliding member 6. Further, the support column 5 itself may be made of a material having good slidability. A sliding contact surface is provided at the lower end of the support column 5 so as to be in sliding contact with the upper surface of the lower plate 2. 2 may be supported so as to be slidable in the horizontal direction relative to the second member 2.

Further, in each of the above embodiments, the support column 5 and the sliding member 6 are fixed to the center of the lower surface of the inner peripheral side member 1b of the upper plate 1, but the support column 5 and the sliding member 6 are rubber members. 8
If the distance until contact with each coil spring 15 is large, the lower surface other than the outer peripheral portion of the upper plate 1, that is, the inner peripheral member 1b
The support column 5 and the sliding member 6 may be attached and fixed anywhere as long as the lower surface is provided.

[0042]

As described above, according to the first aspect of the present invention, at least one of the lower end portion of the support pillar and the upper surface of the lower plate is provided with the upper plate in the horizontal direction relative to the lower plate. The upper plate and the lower plate are elastically connected to each other by an elastic body that extends when the upper plate slides horizontally relative to the lower plate. Small and lightweight seismic isolation device that can effectively exhibit the seismic isolation function of absorbing and absorbing horizontal vibration without vertical movement even with a lightweight superstructure by adopting a simple configuration Is obtained.

According to the second aspect of the present invention, since the sliding member is fixed to the lower end of the support column, the sliding member can be stably slid even if the sliding member is small, and the cost of the sliding member can be reduced. Can be achieved.

According to the third aspect of the present invention, since the sliding member is made of a lubricating resin, the sliding characteristics can be stabilized for a long period of time.

According to the fourth aspect of the present invention, the elastic body is a cylindrical rubber member that connects the entire outer periphery 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 7, 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.
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 fifth 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. It does not react to the wind or the like that acts on the upper structure on a daily basis, and can have a trigger effect that reliably exerts a seismic isolation effect against large ground vibrations.

According to the sixth aspect of the present invention, the thickness of the rubber member near the upper and lower ends is made thicker and gradually thinner toward the center in the vertical direction, so that the stress concentration at the corner of the thickness change portion is increased. A predetermined restoring force can be obtained while alleviating the vibration, and seismic isolation performance can be secured for a long period of time.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a seismic isolation device according to Embodiment 1 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 schematic diagram showing a state in which the seismic isolation device is applied to a private house.

FIG. 5 is a schematic diagram showing a state in which the seismic isolation device is applied to a seismic isolation floor.

FIG. 6 is a view corresponding to FIG. 1, showing another example of bonding the rubber member to the outer peripheral members of the upper plate and the lower plate.

FIG. 7 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. 8 is a diagram corresponding to FIG. 1 showing a seismic isolation device according to a second embodiment.

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 sliding member 8 rubber member (elastic body) 8a thickness change portion 10 damping agent 15 coil spring (elastic body) 21 upper structure 23 foundation 26 floor member (upper part) Structure)

Claims (7)

[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 provided to face the lower side of the upper plate and connected to the foundation; a support column fixed to a lower surface other than an outer peripheral portion of the upper plate so as to extend downward; and a lower end of the support column A sliding member provided on at least one of the portion and the upper surface of the lower plate, and supporting the upper plate together with the support column so as to be slidable relative to the lower plate in a horizontal direction; An elastic body that elastically connects at least a part of an outer peripheral portion of the lower plate and extends when the upper plate slides in a horizontal direction relative to the lower plate. Seismic isolation device. 2. The seismic isolation device according to claim 1, wherein the sliding member is fixed to a lower end of the support column. 3. The seismic isolation device according to claim 1, wherein the sliding member is made of a lubricating resin. 4. The seismic isolation device according to claim 1, 2 or 3, wherein the elastic body connects the entire outer periphery of the upper plate and the lower plate and covers the space between the upper plate and the lower plate. A seismic isolation device comprising a rubber member. 5. The seismic isolation device according to claim 4, wherein a 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. A seismic isolation device characterized in that it is being used. 6. The seismic isolation device according to claim 4, wherein the rubber member has a thickness changing portion near the upper and lower ends, the thickness of which changes gradually toward the opposite side from 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. 7. The seismic isolation device according to claim 1, 2 or 3, wherein the elastic body is wound between the outer peripheral portions of the upper plate and the lower plate at substantially equal intervals in the circumferential direction. A seismic isolation device, characterized in that: