JP2002364705A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation device that can preclude reduction in a base isolating action even after many years and exhibit uniform base isolating performance in all horizontal directions, via a relatively simple structure. SOLUTION: The base isolation device has a column part 1 having a loading surface part 2 for receiving a load on an upper portion and having a sliding plate 3 on a lower portion, and a cylindrical housing part 4 having a bottom plate 5 on which the sliding plate 3 is placed and housing the column part 1 substantially in the center. Around the column part 1, a spiral leaf spring 6 is secured at a lower end to the column part 1 and restrained at an upper end on the housing part 4. The housing part 4 is filled to a given height with a buffer 7 for resisting movement of the column part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be used for seismic isolation of buildings, machines, workpieces, etc., and in particular, has high durability and can exhibit uniform seismic isolation performance in all horizontal directions. Related to the device.

[0002]

2. Description of the Related Art Conventionally, many seismic isolation devices that can be used for seismic isolation of buildings and the like have been proposed. For example, there is known a seismic isolation / vibration control device including a laminate in which an elastic material such as rubber and a metal plate are laminated.

Japanese Patent Application Laid-Open No. 4-31836 discloses a supporting device comprising a spring and a damper for supporting both sides of a table, a floating device for floating the table upward by air pressure, and a floating device for detecting an earthquake. There is described a seismic isolation device including a control device for operating the system. This seismic isolation device activates the levitating device when the control device detects an earthquake. Then, the table floats, and the vibration of the earthquake is not transmitted to the table, and at the same time, the vibration of the table is suppressed by the action of the spring spring and the damper of the support device.After the earthquake, the table is restored by the action of the spring and the damper. Return to position.

Japanese Utility Model Registration No. 3026476 has a column at the center, which is in contact with a bearing at the bottom, a leaf spring is arranged around the column, and is made of steel so as not to come out above. A bearing ball base seismic isolation base provided with a ring seat is described. This bearing ball bearing seismic isolation base resists horizontal forces such as earthquakes and typhoons due to the force of leaf springs, and pull-out force generated when the maximum range of horizontal shaking of the building is reached by the steel ring seat. Is what you do.

The seismic isolation device described in Japanese Patent Application Laid-Open No. Hei 2-183060 has a ball mounted rotatably. The method of using the seismic isolation device is to lower the surface on which the ball is mounted. A seismic isolation device will be installed on a base whose upper surface is concave in a spherical shape, and a building will be built on this seismic isolation device. Then, even if the base shakes due to an earthquake or the like, the ball moves while rotating on the upper surface of the base where the sphere is concave in a spherical shape, and the building attached on the seismic isolation device becomes difficult to vibrate, and after the earthquake is over The ball of the seismic isolation device returns to the lowest position on the base.

[0006]

However, in a laminated body in which rubber and a metal plate are laminated, the rubber deteriorates due to aging and the thickness changes, so that the floor surface of the building is not constant and the horizontal level of the building is low. Is difficult to determine. Further, since the gravity applied to the laminate differs depending on the location of the building, the thickness of the laminate varies depending on the location, and as a result, the building may be tilted. In addition, when the rubber is deteriorated, the elasticity is reduced and the seismic isolation effect is reduced.

In the seismic isolation device described in Japanese Patent Application Laid-Open No. 4-31836, a large-scale device is required to float a building such as a house built on the seismic isolation device by air pressure. Become expensive. For this reason, it is difficult to adopt it in buildings such as ordinary houses.

Further, in the bearing ball bearing seismic isolation base described in Japanese Utility Model Registration No. 3026476, the force of the leaf spring is not uniform in all directions, and the seismic isolation force has directionality. In addition, since the housing accommodating the column and the leaf spring has a quadrilateral shape, directionality can be achieved at the time of installation, and construction is inconvenient.

In the seismic isolation device described in Japanese Patent Application Laid-Open No. Hei 2-183060, resonance may occur because the seismic isolation device is installed on a base whose upper surface is concave in a spherical shape.

The present invention has been made in view of the above circumstances, and has a relatively simple structure so that seismic isolation is not reduced even after many months, and is uniform in all horizontal directions. An object of the present invention is to provide a seismic isolation device that can exhibit performance.

[0011]

The structure of the present invention made to solve the above-mentioned problem is as follows.

That is, a first seismic isolation device of the present invention comprises a column base having an upper portion having a loading surface portion for receiving a load and a lower portion having a sliding plate, and a column having a bottom plate on which the sliding plate is mounted. A cylindrical storage part for storing the leg substantially at the center thereof, wherein the lower end is fixed to the column, around the column.
An upper end has a spiral leaf spring constrained by the storage portion, and is filled with a buffering agent against movement of the column base portion to a predetermined height of the storage portion.

According to the first seismic isolation device of the present invention, the external force (seismic force, wind force, etc.) is relieved by the force of the spiral leaf spring having high uniformity in all horizontal directions, and the load shifted by the external force. Points can be restored. Further, the buffering agent filled in the storage portion can relieve a sudden shock due to an external force, and can also prevent resonance caused by the external force and the force of the spiral leaf spring, so that an extremely effective seismic isolation action can be obtained. Further, with the spiral leaf springs stacked vertically, pulling out (lifting) of the column base can be suppressed, and vertical movement of a load such as a house can be prevented. Further, since the mechanical seismic isolation device does not use rubber, the seismic isolation effect is not significantly reduced due to aging of the material, and the initial seismic isolation performance can be exhibited for a long period of time.

In the above-described seismic isolation device, sand or iron balls, or a mixture of sand or iron balls and a viscous material can be suitably used as the buffering agent. It can also be used.

When a viscous material or a mixture of a viscous material and an iron ball is used as the buffer, it is preferable to provide a plurality of bearings on the lower surface of the sliding plate. According to this configuration, the sliding friction between the sliding plate and the bottom plate can be reduced, and a more effective seismic isolation effect can be obtained.

A second base isolation device according to the present invention comprises a column base having an upper surface for receiving a load and a slide plate at a lower portion, and a column base having a bottom plate on which the slide plate is mounted. And a cylindrical storage portion for storing the helical spring approximately at the center thereof, wherein the base plate has a spiral main spring inside, and the sliding plate receives the storage space via the main spring. The bottom plate has a concave spherical surface, the sliding plate has a sub-sliding plate that contacts the bottom plate via a plurality of spiral child springs,
Around the column base, a lower end is fixed to the column base, a plurality of ring seats are provided so as to partially overlap each other, and an uppermost portion of the ring seat is restrained by the storage section, and the storage section is Up to a predetermined height, a buffer agent against movement of the column base is filled.

According to the above-described seismic isolation device of the second aspect of the present invention, the action of the bottom plate having a spherical surface and the sub-sliding plate abutting on the bottom plate via the main spring and the child spring (spiral spring) acts in the entire horizontal direction. Is uniformly changed to a vertical motion, and the structure is such that seismic / wind energy is absorbed by both the main spring and the small spring. Further, after the earthquake or the like stops, the column base returns to the lowest position of the spherical bottom plate, so that the load point shifted by the external force can be restored. Further, the buffering agent filled in the storage portion can relieve a sudden shock due to an external force, and can also prevent resonance caused by the external force and the forces of the main spring and the child spring, so that an extremely effective seismic isolation action can be obtained. Further, with the plurality of ring seats vertically stacked, pulling out (lifting) of the column base can be suppressed, and vertical movement of a load such as a house can be prevented. Further, since the mechanical seismic isolation device does not use rubber, the seismic isolation effect is not significantly reduced due to aging of the material, and the initial seismic isolation performance can be exhibited for a long period of time.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A seismic isolation device according to the present invention comprises a column base having an upper loading surface portion and a lower slide plate, and a bottom plate on which the slide plate is mounted. And a cylindrical storage part that stores the storage part at substantially the center, and the cylindrical storage part is fixed to, for example, the ground, and the base of the building is fixed to the loading surface at the top of the column base, for example. Usually, a plurality of them are installed and used.

Further, the seismic isolation device of the present invention is installed horizontally (the column base is vertical), and is preferably installed so that no step is formed between a plurality of devices.

Hereinafter, embodiments of the seismic isolation device of the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments, and may be appropriately changed within the scope of the present invention. Design changes are possible.

(First Embodiment) FIGS. 1 and 2 show a first embodiment of a seismic isolation device according to the present invention. The seismic isolation device shown in this embodiment is an example of the first seismic isolation device of the present invention, and FIG.
FIG. 2 is a cross-sectional view schematically illustrating an installed state of the seismic isolation device, and FIG. 2 is a perspective view schematically illustrating a state in which a column base is displaced in a horizontal direction by an external force.

1 and 2, 1 is a column base, 2 is a loading surface, 3 is a sliding plate, 4 is a storage section, 5 is a bottom plate of the storage section, 6 is a spiral leaf spring, 7 is a buffer, 8 is a swivel device,
9 is a regulating member, 10 is a spring holding plate, 11 is bellows rubber, 1
Reference numeral 2 denotes an anchor, reference numeral 13 denotes a house base, and reference numeral 14 denotes a flange provided in the middle of the column base 1.

The storage section 4 has a cylindrical shape, and has a bottom plate 5 on the bottom surface. The storage section 4 is fixed to the concrete foundation by a plurality of anchors 12 in order to avoid lifting of the entire apparatus.

The column base 1 is made of a steel pipe, and is accommodated in a central portion of the accommodating section 4 with a sliding plate 3 provided thereunder mounted on the bottom plate 5. A part of the upper part of the column base 1 protrudes from the upper surface of the storage part 4, and the loading surface part 2 is fixed to the uppermost part. A house base 13 is fixed on the loading surface 2 with bolts or the like.
The house base 13 is preferably reinforced so that distortion does not occur, for example, by using a lot of braces.

The spiral leaf spring 6 has a series of forms in which one turn and one turn are partially overlapped with each other vertically even at the time of maximum movement of the column base 1, and is arranged concentrically around the column base 1. I have. The lower inner surface of the spiral leaf spring 6 is fixed to the upper surface of a flange 14 provided in the middle of the column base 1 by approximately one turn, and the upper end surface of the spiral leaf spring 6 is fixed by a spring holding plate 10 to the storage portion 4.
Is constrained by the upper surface part of.

The spiral leaf spring 6 is made of steel, and the number of turns and the strength of the spiral leaf spring 6 are appropriately designed according to the load.

FIGS. 3A to 3C show examples of the structure of the spiral leaf spring 6.
(D). (A) shows an H-shaped cross-sectional shape, (b) shows a Z-shaped cross-sectional shape, (c) shows an L-shaped cross-sectional shape, and (d) shows an I-shaped cross-sectional shape. Shaped ones can also be used.

The storage part 4 is filled with a buffer 7 to a predetermined height. The cushioning agent 7 is mainly used to oppose the movement of the column base 1, and has a function of relieving a sudden shock caused by an external force by an internal frictional force, and a resonance effect by the external force and the force of the spiral leaf spring 6. It has the effect of canceling out. Therefore, the buffer 7 can be called a delay material or a moderator. Note that the amount and depth of the buffer 7 are appropriately designed depending on the required buffering force and loading load, and the buffering force can be adjusted by the thickness and length of the column base 1.

As the buffering agent 7, any material having a desired buffering force and fluidity can be used, and specific examples thereof include sand and iron balls (for example, pachinko balls). is there. Further, it is preferable to mix a viscous material to adjust friction of sand or iron balls. As this viscous body, those which have little heat change and aging are preferable.
A liquid such as CB is preferably used. However, in a case where the structure is easy to maintain, for example, by providing a buffer agent inlet / outlet in a part of the storage section 4, mineral oil or the like can be used. Further, it is also possible to use a syrup-like high-viscosity material such as silicone grease or high-viscosity grease alone as the buffer 7.

In the case where sand is used as the buffer 7, a material which is sufficiently dried to prevent rusting of other members made of metal is used. Further, it is preferable that an appropriate gradient is provided around the bottom of the sliding plate 3 and that a sliding material such as a copper plate or resin is attached to the bottom surface of the sliding plate 3. Further, as will be described later in detail, it is preferable to form a radial groove on the entire upper surface of the bottom plate 5.

At predetermined height positions on the outer periphery of the column base 1 and the inner periphery of the storage section 4, there are provided flange-shaped regulating members 9a and 9b for regulating the rise of the buffer agent 7, respectively.
The restricting members 9a and 9b cause the column base 1
This is for preventing a large difference in height from occurring in the buffering agent 7 when moving, and preventing the buffering agent 7 from making the buffering force non-uniform.

A free movement device 8 is provided between the lower portion of the column base 1 and the sliding plate 3 to apply a uniform weight to the entire sliding plate. The swiveling device 8 of the present example is provided with a hemispherical convex portion 8a subjected to rust-proofing at the upper center of the sliding plate 3 made of stainless steel, rust-proofed steel or the like. It has a structure in which hemispherical concave portions 8b which have been subjected to rust prevention treatment are provided, these are fitted together, and an oil-free metal is disposed in a contact portion. It is preferable to insert a packing (not shown) between the column base 1 and the sliding plate 3 in order to prevent the buffer 7 from entering.

A bellows rubber 11 is provided in the upper opening of the housing 4. The bellows rubber 11 has a peripheral portion fixed to the spring holding plate 10 and an inner portion fixed to the column base 1, and expands and contracts as the column base 1 moves. By providing such a bellows rubber 11, it is possible to prevent water, dust, small animals and the like from entering the device, and it is possible to further enhance the durability and reliability of the device.

In place of the bellows rubber 11, a dustproof umbrella 15 that moves in conjunction with the column base 1 can be provided as shown in FIG. In this case, a packing 16 is provided between the dustproof umbrella 15 and the spring holding plate 10. By fixing the packing 16 to the spring holding plate 10, the dustproof umbrella 15 always slides on the packing 16. As the packing 16, synthetic rubber can be used, but since synthetic rubber has a service life of about 10 years, it is preferable to use a steel plate or the like which has been subjected to rust-proofing and processed into an appropriate shape.

In the seismic isolation device having the above-described configuration, when, for example, seismic force or wind acts, the column base 1 supporting the house base 13 relatively moves in the accommodation part 4 as shown in FIG. . At this time, the shock caused by the seismic force is relieved by the frictional force (resistance force) of the buffer agent 7, and the seismic force is reduced by the force of the spiral leaf spring 6 designed to have a predetermined strength. The movement amount is restricted within a predetermined range. In addition, after the seismic motion and wind motion, the spiral leaf spring 6
The column base 1 is returned to the original position by the restoring force.

Since the force of the spiral leaf spring 6 used in the present invention is almost uniform in all horizontal directions, the seismic isolation force has almost no directionality, and it is possible to exhibit uniform seismic isolation performance in all horizontal directions. it can.

When the column base 1 is moved by an external force, the swelling phenomenon of the buffer 7 made of sand or the like as described above usually occurs at the front of the column base 1 in the moving direction. However, by providing the regulating members 9a and 9b as in this example, the swelling can be quickly moved to the rear portion of the column base 1 by the regulating member 9a, and the swelling at the peripheral portion can be prevented by the regulating member 9b. be able to. As described above, when the column base 1 moves due to the external force, it is possible to prevent a large height difference from being generated in the buffer 7 and to prevent the buffer 7 from becoming uneven in the buffering force. This can effectively prevent the occurrence of seismic properties, and can more reliably exhibit uniform seismic isolation performance in all horizontal directions.

The column base 1 has a spring holding plate 10
The vertical movement is regulated by the spiral leaf springs 6 which are regulated by the vertical direction, so that pulling out (lifting) of the column base 1 due to external force such as seismic force is suppressed.

As described above, the spiral leaf spring 6 used in the apparatus according to the present embodiment has a structure that withstands a pulling force at the same time as a uniform buffering / restoring action in all horizontal directions, and uses rubber. Because it is a mechanical seismic isolation device that does not use a very simple structure, it can exhibit uniform seismic isolation performance in all horizontal directions, and the seismic isolation effect due to aging of the material is extremely small, Early seismic isolation performance can be demonstrated.

(Second Embodiment) A second embodiment of the seismic isolation device of the present invention will be described with reference to FIG. FIG. 5 (a)
FIG. 5 is a cross-sectional view schematically showing a contact portion between a bottom plate and a sliding plate of the seismic isolation device of the present example, and FIG. 5B is a top view of the bottom plate of the seismic isolation device of the present example. Except for the configuration described here, it is the same as the seismic isolation device shown in the first embodiment.

The seismic isolation device of this embodiment is suitable especially when sand is used as a buffer. That is, in this example, an appropriate gradient is provided around the bottom of the sliding plate 3 and a plurality of grooves 17 are formed radially in the bottom plate 5 of the storage portion, and sand that has become powdery due to long-term use is filled in the grooves 17. And slide plate 3
Is moved to the outer peripheral portion of the bottom plate by utilizing the moving action of. According to this configuration, it is possible to prevent the powdered sand from sticking to the upper surface of the bottom plate, prevent the sliding plate 3 from hitting one side, and keep the height of the sliding plate constant. In this way, the initial seismic isolation performance can be exhibited over a long period of time.

The above-mentioned groove 17 is formed, for example, in a width 1
It is preferably formed at a pitch of several tens of mm with a depth of about 5 mm and a depth of about 10 mm.

(Third Embodiment) A third embodiment of the seismic isolation device of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view schematically showing an abutting portion between a bottom plate and a sliding plate of the seismic isolation device of the present example. The seismic isolation device shown in the first embodiment except for the configuration described here. Is the same as

In this embodiment, a plurality of one-point bearings 18 (having the same function as the tip of a ball-point pen having a large ball) are provided at the bottom of the sliding plate 3 to reduce sliding friction. In FIG. 6, reference numeral 19 denotes a bearing holding plate.

In this embodiment, sand cannot be used as a buffer, and it is preferable to use the above-mentioned viscous material or a mixture of a viscous material and an iron ball.

(Fourth Embodiment) FIGS. 7 to 9 show a fourth embodiment of the seismic isolation device of the present invention. The seismic isolation device shown in this embodiment is an example of the second seismic isolation device of the present invention, and FIG.
Is a cross-sectional view schematically showing the installation state of the seismic isolation device, FIG. 8 is an enlarged cross-sectional view schematically showing the contact portion between the bottom plate and the sliding plate,
FIG. 9 is an enlarged sectional view schematically showing a ring seat around a column base.

7 to 9, the same reference numerals as those in FIG. 1 indicate the same members, 5a is a spherical bottom plate, 20 is a spiral main spring, 21 is a spiral child spring, 22 is a cylinder, 23 is a freely movable member, 24 is a sub-sliding plate, 25 is a communication hole, and 26 is a ring seat.

The bottom plate 5a of the storage section 4 has a concave spherical surface. However, the center of the spherical bottom plate 5a (the range on which the sub-sliding plate 24 rides in a calm state) is a flat surface.

The column base 1 is made of a steel pipe and has a spiral main spring 20 inside. The strength of the main spring 20 is set sufficiently higher than the loaded load.

A free movement device 8 similar to that of the first embodiment is provided between the lower portion of the column base 1 and the sliding plate 3, and the sliding device provided at the lower portion of the column base 1 is provided. The plate 3 has a main spring 20.
In addition, it is in contact with the spherical bottom plate 5 a of the storage section 4 via the movable device 8.

As shown in FIG. 8, the sliding plate 3 of this embodiment is provided with a plurality of piston structures composed of a spiral child spring 21, a cylinder 22, a movable member 23 and a sub-sliding plate 24. ing.

The composite strength of the plurality of child springs 21 having the same strength is designed to be greater than the strength of the main spring 20. By designing in this way, when the sliding plate moves on the irregular shape of the bottom plate, it is possible to avoid one-sided impact of the load, and to impart an even load to the child spring by the effect of the free movable parts 8 and 23. And has the effect of smoothing the movement of the sliding plate.

The bottom of the sub-sliding plate 24 is formed of a curved surface having a curvature slightly smaller than that of the spherical bottom plate 5a in order to prevent attraction with the spherical bottom plate 5a. The sub-sliding plate 24 is connected to the movable member 23, so that the sub-sliding plate 24 can maintain the close contact with the spherical bottom plate 5a even when the column base 1 is displaced.

Around the column base 1, a plurality of ring seats 26 made of steel are arranged. These ring seats 26 have a form partially overlapped vertically, and the lowermost ring seat is
It is fixed to the upper surface of the flange portion 14 provided at the middle stage of the column base 1 by approximately one turn by bolting or the like, and the uppermost end surface makes substantially one round, and is fixed to the spring holding plate 10 by bolting or the like. , Is restricted by the upper surface of the storage section 4.

As shown in FIG. 9, the ring seat 26 has a rising flange at an inner portion so that the ring can be prevented from coming off. A sliding member 27 is interposed between overlapping portions of the ring seats 26 to realize a smooth movement.

The storage section 4 is filled with a buffer 7 to a predetermined height, as in the first embodiment. As the buffer 7, a viscous material that is less likely to undergo thermal and aging changes is preferable, and a liquid such as PCB is preferably used. For example, maintenance is easy by providing a port in a part of the storage unit 4. In the case of a structure, mineral oil or the like can be used.

At predetermined height positions on the outer periphery of the column base 1 and the inner periphery of the storage section 4, similarly to the first embodiment, a flange-like shape for regulating the rise of the buffer 7 is provided. It has regulating members 9a and 9b.

Further, the upper opening of the housing 4
As with the example shown in FIG.
Is provided.

In the seismic isolation device having the above-described structure, when, for example, an earthquake or wind acts, the horizontal motion is reduced by the action of the spherical bottom plate 5a and the piston structure connected to the sub-slide plate 24. , The seismic / wind energy can be absorbed by both the main spring 20 and the child spring 21, and a smooth movement from a minute movement to a maximum movement can be achieved. In addition, the shock force due to the seismic force is relieved by the frictional force (resistance force) of the buffer 7, and the main spring 2
The action of the vertical movement can also be reduced by the action of the zero and the child spring 21. Further, after the seismic motion / wind motion, the column base 1 is returned to the original position by the action of the central flat portion of the spherical bottom plate 5a.

The action of the main spring 20 and the child spring 21 in the present embodiment is substantially uniform in all horizontal directions, so that the seismic isolation force has little directionality and exhibits uniform seismic isolation performance in all horizontal directions. can do.

The column base 1 has a spring holding plate 10
By the ring seat 26 which is regulated by
Since vertical movement is restricted, pulling out (lifting) of the column base 1 due to external force such as seismic force is suppressed.

As described above, the device of this embodiment has a structure that resists the pull-out force at the same time as a uniform buffering / restoring action in all horizontal directions, and is a mechanical seismic isolation device that does not use rubber. Therefore, the seismic isolation performance can be exhibited uniformly in all horizontal directions, and the seismic isolation effect of the material due to aging is extremely small, so that the initial seismic isolation performance can be exhibited over a long period of time.

[0063]

As described above, according to the present invention, the following effects can be obtained.

(1) According to the seismic isolation device of the first aspect, the external force (seismic force / wind force) is alleviated by the force of the spiral leaf spring uniformly in all horizontal directions, and the load point shifted by the external force is reduced. Can be restored. In addition, the buffer agent filled in the storage portion can relieve sudden shock due to external force, and can also prevent resonance due to external force and the force of the spiral leaf spring,
Extremely effective seismic isolation is obtained. Further, with the spiral leaf springs stacked vertically, pulling out (lifting) of the column base can be suppressed, and vertical movement of a load such as a house can be prevented. Further, since the mechanical seismic isolation device does not use rubber, the seismic isolation effect is not significantly reduced due to aging of the material, and the initial seismic isolation performance can be exhibited for a long period of time. Therefore, a seismic isolation device that can exhibit uniform seismic isolation performance in all horizontal directions with an extremely simple structure and can exhibit initial seismic isolation performance for a long period of time is provided.

(2) According to the seismic isolation device of the fourth aspect, the movement in the entire horizontal direction is achieved by the action of the spherical bottom plate and the sub-sliding plate abutting on the bottom plate via the main spring and the child spring. The structure is such that the motion is uniformly changed in the vertical direction, and the seismic / wind energy is absorbed by both the main spring and the small spring (spiral spring). Further, after the earthquake or the like stops, the column base returns to the lowest position of the spherical bottom plate, so that the load point shifted by the external force can be restored. Further, the buffering agent filled in the storage portion can relieve a sudden shock due to an external force, and can also prevent resonance caused by the external force and the forces of the main spring and the child spring, so that an extremely effective seismic isolation effect can be obtained. Further, with the plurality of ring seats vertically stacked, pulling out (lifting) of the column base can be suppressed, and vertical movement of a load such as a house can be prevented. Further, since the mechanical seismic isolation device does not use rubber, the seismic isolation effect is not significantly reduced due to aging of the material, and the initial seismic isolation performance can be exhibited for a long period of time. Therefore, there is provided a seismic isolation device capable of exhibiting uniform seismic isolation performance in all horizontal directions and exhibiting initial seismic isolation performance for a long period of time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically illustrating an installed state of a seismic isolation device according to a first embodiment of the present invention.

FIG. 2 is a perspective view schematically showing a state in which a column base is displaced in a horizontal direction by an external force in the seismic isolation device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a cross-sectional shape of a spiral leaf spring.

FIG. 4 is a cross-sectional view schematically showing an installed state of the seismic isolation device of the present invention provided with a dust umbrella.

5A and 5B are explanatory views of a seismic isolation device according to a second embodiment of the present invention, wherein FIG. 5A is a cross-sectional view schematically showing a contact portion between a bottom plate and a sliding plate, and FIG. It is a top view of a bottom plate.

FIG. 6 is a cross-sectional view schematically showing a contact portion between a bottom plate and a sliding plate of a seismic isolation device according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view schematically showing an installed state of a seismic isolation device according to a fourth embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view schematically showing a contact portion between a bottom plate and a sliding plate of a seismic isolation device according to a fourth embodiment of the present invention.

FIG. 9 is an enlarged sectional view schematically showing a ring seat around a column base of a seismic isolation device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column base part 2 Loading surface part 3 Sliding plate 4 Storage part 5 Bottom plate 5a Spherical bottom plate 6 Spiral leaf spring 7 Buffer 8 Swinging device 9, 9a, 9b Control member 10 Spring holding plate 11 Bellows rubber 12 Anchor 13 House base 14 Collar provided at the middle of the column base 15 Dustproof umbrella 16 Packing 17 Groove 18 One-point bearing 19 Bearing holding plate 20 Helical main spring 21 Helical child spring 22 Cylinder 23 Free moving member 24 Secondary sliding plate 25 communication hole 26 ring seat 27 sliding material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04H 9/02 E04H 9/02 331Z F16F 9/30 F16F 9/30 15/04 15/04 D

Claims (6)

[Claims] 1. A cylindrical base having a loading surface portion receiving a load at an upper portion and a sliding plate at a lower portion, and a bottom plate having a bottom plate on which the sliding plate is placed and accommodating the column base at substantially the center. And a spiral leaf spring having a lower end fixed to the column base and an upper end constrained by the storage section around the column base. The seismic isolation device is filled with a buffer against movement of the column base to a predetermined height. 2. The buffer according to claim 1, wherein the buffer is sand or iron ball, or
The seismic isolation device according to claim 1, wherein a viscous material is mixed with sand or an iron ball. 3. The buffer according to claim 1, wherein the buffer is a viscous body or a mixture of a viscous body and an iron ball, and has a plurality of bearings on a lower surface of the slide plate. Seismic isolation device. 4. A cylindrical base having a loading surface portion receiving a load at an upper portion and a sliding plate at a lower portion, and a bottom plate having a bottom plate on which the sliding plate is placed and accommodating the column base at substantially the center. And a helical main spring inside the column base, wherein the sliding plate is in contact with a bottom plate of the storage section via the main spring. The bottom plate has a concave spherical surface, the sliding plate has a sub-sliding plate that contacts the bottom plate via a plurality of spiral child springs, and a lower end is provided around the column base. A plurality of ring seats are provided which are fixed to the column base and partially overlap sequentially, and the uppermost part of the ring seat is restrained by the storage section. A seismic isolation device characterized by being filled with a buffer against movement. 5. The seismic isolation device according to claim 4, wherein the buffer is a viscous material. 6. The device according to claim 1, further comprising a regulating member on an outer peripheral surface of the column base portion and an inner peripheral surface of the storage portion for restricting a swelling of the buffer. Seismic isolation device.