JP2968260B1 - Seismic isolation device and seismic isolation structure of light-weight structure provided with this device - Google Patents

Abstract

In a conventional seismic isolation device, when an earthquake having an amplitude stroke exceeding a seismic isolation range occurs, a sphere collides with a stopper, and a loud impact sound is generated at each impact. It will be. In order to prevent this, it is necessary to install many dampers and stoppers away from the installation position of the seismic isolation device, and the construction period is greatly extended and the cost is high, and replacement work is also required. It takes time and cannot be adopted in practice. SOLUTION: A lower support plate 2 fixed to the ground side, and a sphere 7 rotatably mounted on the lower support plate 2
An upper support plate 3 supported by the sphere 7 and fixed above the lower support plate 2 with the sphere 7 interposed therebetween;
And the upper surface of the lower support plate 2 and / or
Alternatively, ring-shaped stoppers 6 and 13 surrounding the sphere 7 are formed on the lower surface of the upper support plate 3, and the inner surfaces of the stoppers 6 and 13 surround the sphere 7 and Alternatively, the outer peripheral surfaces of the ring-shaped shock absorbers 8 and 14 made of an elastic foam are bonded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device used to attenuate earthquake vibrations and protect buildings from the earthquake vibrations, and to detached houses and the like provided with the seismic isolation devices. This is related to the seismic isolation structure of light weight structures.

[0002]

2. Description of the Related Art As is well known, as a conventional seismic isolation device for protecting a building from vibrations caused by an earthquake, a seismic isolation device that supports an upper structure from below with a laminated rubber in which rubber plates and iron plates are alternately stacked. It has been proposed and has been put to practical use in some cases. However, the seismic isolation device having such a structure is effective when applied to a heavy structure such as a concrete building such as a high-rise building, and aims at seismic isolation of a light-weight structure such as a detached house. In some cases, it is not always effective. On the other hand, as a seismic isolation device that is more effective than the above-mentioned seismic isolation device using laminated rubber for seismic isolation of such lightweight structures, a lower bearing plate fixed to the ground side and a lower base plate fixed to the building side There has been proposed a seismic isolation device having a structure in which one or a plurality of spheres are arranged between an upper support plate and the spheres are rolled on the lower support plate and below the upper support plate by an earthquake.

By the way, when such a seismic isolation device using a sphere as a component is used for a light-weight structure such as a detached house, if an effective seismic isolation function is expected even for an earthquake having a long amplitude stroke, The length and width of the lower support plate and the upper support plate on which the spheres are mounted may be designed to be long. However, if these lower and upper support plate devices are made to be long, they not only increase the cost, but also limit the site area of the house, as well as the adjacent houses, fences and other structures. In consideration of the distance to an object, it is practically impossible to make the device unlimitedly long. Therefore, a certain range or limit that can correspond to the amplitude stroke of the anticipated earthquake is provided, and even if an earthquake having an amplitude stroke greater than the range or the limit occurs, the sphere is moved from the lower support plate or the upper support plate. It is necessary to prevent falling off. Therefore, a certain range or limit that can correspond to the amplitude stroke of the earthquake is provided in this way, and even when an earthquake having an amplitude stroke larger than the range occurs,
As a conventional seismic isolation device having a structure in which a sphere does not fall off, for example, a seismic isolation device described in JP-A-6-158912 has been proposed. In this seismic isolation device, a stopper portion (inner wall 10) is formed which is raised or hung from an outer peripheral edge of an upper surface of a lower support plate (spherical case 1B) and an outer peripheral edge of a lower surface of an upper support plate (spherical case 1A). Further, a number of tension springs 6 are provided as components that restrict the relative horizontal movement of the lower support plate and the upper support plate within a certain range. Therefore, according to the conventional seismic isolation device having such a configuration, the lower bearing plate and the upper bearing plate relatively start horizontal movement due to the vibration of the earthquake through the rolling of the sphere provided therebetween, and eventually. When the sphere reaches the stopper, the stopper further restricts the horizontal movement of the lower bearing plate and the upper bearing plate. The horizontal movement of the lower and upper bearing plates is also restricted by the elastic force of the plurality of tension springs, and the tension springs restore the seismic isolation device to a state before the occurrence of the earthquake. It also acts as a force. In addition, as described above, a method is provided in which a certain range or limit is provided that can correspond to an amplitude stroke of an expected earthquake, and when an earthquake having an amplitude stroke that exceeds the range or the limit occurs, the seismic isolation effect is restricted. As an example, a device provided with a damper, a stopper, and the like at a position apart from the installation position of the seismic isolation device has been proposed.

[0004]

However, in the seismic isolation device described in Japanese Patent Application Laid-Open No. 6-158912, when an earthquake having an amplitude stroke exceeding the seismic isolation range occurs, the sphere collides with the stopper. As a result, a loud impact sound is generated for each impact. In addition, this seismic isolation device has the effect of restricting the relative horizontal movement between the lower support plate and the upper support plate even with a large number of tension springs, but how to set the elastic modulus of the tension spring is a technical issue. And the replacement work also takes time. In addition, if dampers and stoppers are installed at locations distant from the location of the seismic isolation device, it is necessary to install a large number of them in consideration of the need to respond to seismic motion in all directions. Are greatly extended and costly, and cannot be practically adopted.

Accordingly, the present invention has been proposed to solve the various problems of the above-mentioned conventional seismic isolation device and the like, and has a certain range or limit capable of coping with an anticipated earthquake amplitude stroke. Despite the installation, it is possible to effectively reduce the generation of loud impact noise due to the vibration caused by the earthquake, does not require large labor for replacement work, furthermore, does not cause a significant extension of the construction period and suppresses the price It is an object of the present invention to provide an epoch-making seismic isolation device that can be used and a seismic isolation structure of a light weight structure provided with the seismic isolation device.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and has first and second aspects.
Akira is a seismic isolation device, and the third invention is a seismic isolation structure of a light weight structure. Therefore, the first invention (the invention described in claim 1) includes a lower support plate fixed to the ground, a sphere rollably mounted on the lower support plate, and a sphere supported by the sphere. And an upper support plate fixed above the lower support plate with the sphere interposed therebetween, and an upper surface of the lower support plate and / or a lower surface of the upper support plate, stopper ring-shaped surrounding the spheres is formed on the inner circumferential surface of the stopper portion, that Do outer peripheral surface of the ring-shaped shock absorber made of rubber or elastic foam is bonded together surround the sphere With this shock absorption
The body has a hard layer formed in the innermost ring shape and this
A first intermediate layer formed into a ring outside the hard layer;
A soft layer formed in a ring shape outside the first intermediate layer
And a second inner ring formed outside the soft layer.
And a material layer .

The rubber which is one of the materials of the shock absorber constituting the first invention is a natural rubber (latex rubber), styrene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, butyl rubber. ,
Synthetic rubber such as nitrile rubber, ethylene-propylene rubber, acrylic rubber, urethane rubber, silicone rubber, fluorine rubber, polysulfide rubber, or a thermoplastic elastomer can be used. Examples of the thermoplastic elastomer include an olefin-based elastomer (polyethylene elastomer, polypropylene elastomer), an amide-based elastomer (polyamide elastomer), a styrene-based elastomer (styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylenebutylene-styrene). Copolymer), polyurethane, and urethane-based elastomer. Further, as the urethane-based elastomer, thermoplastic polyurethanes such as thermoplastic polyether polyurethane and thermoplastic polyester polyurethane can be used. In addition, as such rubber, more specifically, trademark “Hanenit” related to the manufacture of Naigai Rubber Co., Ltd.
Alternatively, the trademark “Haplagel” related to the manufacture of Dai-Ichi Denko Corporation may be used. Further, as the elastic foam, a sponge-like porous polyurethane, a porous polyvinyl marmal, or a urethane foam, a cellulose foam, a nylon foam, or the like is used as the elastic foam which is another material of the shock absorber. can do. More specifically, as the elastic foam, a trademark “Memory Foam” made of polyurethane foam and sold by Casey Shokai Co., Ltd. may be used.

[0008] The hard material constituting the first invention is
Layer, intermediate layer, and soft layer are made of the rubber or foamed elastic material described above.
From among the three materials with different hardness are extracted as appropriate,
Material from the innermost layer of the shock absorber, the first medium
A layer, a soft layer, and a second intermediate layer may be stacked in this order. Soshi
As the rubber that can be used as the hard layer,
The hardness of the rubber or elastic foam used for the soft and soft layers
Is relatively determined by the relationship of
Use tongue rubber, acrylic rubber, fluorine rubber, etc.
Can be. Further, as the first and second intermediate layers,
For example, nitrile rubber, butyl rubber, ethylene propylene
Rubber, etc. can be used.
Rubber, styrene rubber, silicone rubber or thermoplastic rubber
The trademark “Hap” related to the production of Lastmer and Daiichi Denko
Lagel "can also be used. In addition, the elastic foam
The body consists of this hard layer, the (first and second) middle layer, the soft layer
Any, particularly an elastic foam forming a middle layer or a soft layer
Can be used as

A second invention (an invention according to claim 2) includes a lower support plate fixed to the ground and a lower support plate.
A sphere that is rollably mounted on a backing plate and this sphere
Supported above the lower support plate with the sphere interposed therebetween.
And a fixed upper support plate.
The upper surface of the lower support plate and the lower surface of the upper support plate
A ring-shaped stopper that has the same diameter and surrounds the sphere
Each of these stoppers has an inner peripheral surface
A ring-shaped elastic body is fixed, and
Inside the sphere, surround the sphere and measure the radius of the sphere
A ring-shaped shock absorber with a longer height than
Is mounted so as to be movable in the radial direction of the stopper.
This shock absorber is made of soft rubber or elastic foam.
Intermediate ring body, and the lower surface on the upper surface of this intermediate ring body
The outer peripheral surface is bonded to the stopper formed on the upper support plate.
Facing the inner circumferential surface of the
Upper ring and the lower part of the intermediate ring
The surface is adhered and the outer peripheral surface is a strike formed on the lower support plate.
The ring faces the inner peripheral surface of the
Lower ring body formed and inner circumference of the intermediate ring body
The outer surface is bonded to the surface, and the height is the lower part
Measure the length from the lower surface of the ring to the upper surface of the upper ring.
And an inner ring body that is equalized.
It is characterized by the following.

[0010] The third invention (the invention according to claim 4).
Akira) is a seismic isolation structure for a light weight structure,
Specifies that the seismic isolation device according to the second invention is provided.
It is a sign.

[0011]

[0012]

[0013]

[0014]

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a seismic isolation device according to the present invention and a seismic isolation structure of a light-weight structure provided with the seismic isolation device will be described below in detail with reference to the drawings.

First, the seismic isolation structure of a light-weight structure using the seismic isolation device according to the present invention will be briefly described, and then the seismic isolation device used in the seismic isolation structure will be described in detail. As shown in FIG. 1, this seismic isolation structure includes a square base plate B on a foundation concrete A as a ground.
Are fixed by anchor bolts (not shown), and a lower support plate 2 constituting the seismic isolation device 1 according to the first embodiment is fixed on the base plate B. An upper bearing plate 3 fixed to the lower surface of a first base, which will be described later, is provided via a sphere (not shown). That is, in the present embodiment, the seismic isolation device 1 constituting the present invention is fixed to the lower bearing plate 2 fixed to the base plate B, a sphere (not shown), and a base constituting a light weight structure. And an upper support plate 3. A concave surface is formed on the upper surface of the lower support plate 2, and a concave surface having the same shape as the concave surface is also formed on the lower surface of the upper support plate 3. On the upper surface of the upper support plate 3, an H-shaped steel S as a first base is fixed by bolts 4, 4, and 4. On the upper surface of the H-shaped rope S, a wooden base W as a second base is provided. Has been fixed. Then, a pillar (not shown) is erected on the upper surface of the wooden base W to constitute a light weight structure as a whole. Therefore, when an earthquake occurs, the foundation concrete A, the base plate B, and the lower bearing plate 2 as the ground oscillate, and a sphere (not shown) rolls with the amplitude of the lower bearing plate 2. The amplitude is not transmitted to the upper support plate 3, and
The entire lightweight structure including the type rope S, the wooden base W, and the columns (not shown) is protected from the seismic motion. In FIG. 1, although only one seismic isolation device 1 according to the above-described configuration is described, it is assumed that the seismic isolation device 1 is provided below each part where the wooden base W and the wooden base W intersect, It is assumed that the entire lightweight structure is supported by these seismic isolation devices 1.

Next, the seismic isolation device 1 according to the first embodiment will be described in detail. This seismic isolation device 1
As shown in FIGS. 2 and 3, a lower bearing plate 2 fixed to the base plate B fixed on the founder concrete A by bolts (not shown) with first to fourth bolts 5, 5, 5, 5 And a sphere 7 rotatably mounted on the upper surface of the lower support plate 2 and a first sphere 7 constituting a lightweight structure.
An upper support plate 3 having an upper surface fixed to the lower surface of an H-shaped steel S as a base and supported by the sphere 7;
It has.

The lower support plate 2 is formed of iron into a square shape having a side length of approximately 400 mm.
At the corner, an insertion hole (reference numeral is omitted) through which the first to fourth bolts 5, 5, 5, 5 are inserted is formed.
One stopper 6 is fixed to the upper surface of the lower support plate 2 so as to surround the sphere 7. The one stopper portion 6 is a member for preventing the sphere 7 from falling off from the upper surface of the lower support plate 2 when the foundation concrete A as the ground sways left and right during an earthquake, As shown in FIG. 2, it is formed into a ring shape by iron, and is fitted in arc-shaped grooves 2a formed inside four corners of the upper surface of the lower support plate 2, respectively. Also,
The one stopper 6 is not completely provided on the upper surface of the lower support plate 2, but is partially formed so as to overhang from the upper surface of the lower support plate 2.

Further, one shock absorber 8 constituting the present invention is adhered to the inner peripheral surface of the one stopper portion 6. This one shock absorber 8 causes the amplitude stroke of the lower support plate 2 to reach the maximum allowable range in the event of an earthquake, and the sphere 7 directly collides with the one stopper 6 to generate a large impact sound and vibration. As shown in FIG. 2, the entire shape is formed in a ring shape, and each is formed in a ring shape, and four layers of rubber having different hardness are laminated. It is molded, and the hardness of this rubber is the highest hardness,
It is classified into three types: soft, which has the lowest hardness, and medium, which is an intermediate hardness between the hard and soft. That is, as shown in FIG. 3, the one shock absorber 7 includes a first intermediate rubber 9 having an outer peripheral surface bonded to an inner peripheral surface of the one stopper portion 6 and formed into a ring shape. A first soft rubber 10 which is also formed in a ring shape and has an outer peripheral surface adhered to an inner peripheral surface of the first intermediate rubber 9 and has a lower hardness than the first intermediate rubber 9. A second intermediate rubber 11 having an outer peripheral surface adhered to the inner peripheral surface of the first soft rubber 10 and formed into a ring shape; and a second intermediate rubber 11 similarly formed into a ring shape. A first hard rubber 12 having an outer peripheral surface adhered to an inner peripheral surface of the rubber 11 and having a higher hardness than the first and second intermediate rubbers 9 and 11. The first and second intermediate rubbers 9, 11 are:
It is an intermediate layer constituting the present invention. Further, the first soft rubber 10 is a soft layer constituting the present invention, and the first hard rubber 12 is a hard layer constituting the present invention.

The spherical body 7 is placed on the upper surface of the lower support plate 2 and inside the one shock absorber 8. The sphere 7 is formed of iron, and when the foundation concrete A as the ground shakes in the horizontal direction during an earthquake, the sphere 7 rolls on the upper surface of the lower support plate 2 and the wooden base as the second base. The seismic motion is not transmitted to a light-weight structure such as a detached house (not shown) formed on the upper surface of W.

Next, the upper support plate 3 will be described. The upper support plate 3 is supported by the spherical body 6 and has an upper surface fixed to the H-shaped steel S by bolts 4, 4, 4. The upper support plate 3 is formed of iron in a square shape having a side of 400 mm, similarly to the lower support plate 2. As shown in FIG. 3, the lower surface of the upper support plate 3 is restored to its original position when the earthquake is over.
a. Then, 4 on the lower surface of the upper support plate 3
An arc-shaped groove 3b is formed inside the corner, similarly to the lower support plate 2, and the other stopper 13 is fitted in the groove 3b. This other stopper 13
As in the case of the above-mentioned one stopper portion 6, it is formed in a ring shape by iron, is not completely provided inside the lower surface of the upper support plate 3, and partially overhangs from the lower surface of the upper support plate 3. It is formed in a state.

The other shock absorber 14 is bonded to the inner peripheral surface of the other stopper 13. Like the one shock absorber 8, the other shock absorber 14 allows the amplitude stroke of the lower support plate 2 to reach the maximum allowable range in the event of an earthquake, and the sphere 7 moves to the other stopper portion 1.
This is a member to prevent the generation of loud impact noise and vibration by directly colliding with No.3, and is formed into a ring shape and laminated with four layers of hard, medium, and soft rubbers of three kinds of hardness. It is formed by this. That is, as shown in FIG. 3, the other shock absorber 14 includes a third intermediate rubber 15 having an outer peripheral surface bonded to an inner peripheral surface of the other stopper portion 13 and formed into a ring shape. The first soft rubber 1 is also formed in a ring shape and has an outer peripheral surface adhered to an inner peripheral surface of the third intermediate rubber 15.
A second soft rubber 16 having the same hardness as 0, a fourth middle rubber 17 formed in a ring shape by bonding an outer circumferential surface to an inner circumferential surface of the second soft rubber 16, and a ring The first hard rubber 12 has an outer peripheral surface bonded to an inner peripheral surface of the fourth intermediate rubber 17.
And a second hard rubber 18 molded to the same hardness as the second hard rubber 18. The third and fourth intermediate rubbers 1
Reference numerals 5 and 17 denote first intermediate layers constituting the present invention. The soft rubber 16 is a soft layer constituting the present invention, and the hard rubber 18 is a hard layer constituting the present invention.

The first and second soft rubbers 10,
16 shows that the lower bearing plate 2 swings right and left due to the seismic motion, and the sphere 7 rolls on the upper surface of the lower bearing plate 2.
When the sphere 7 rolls until it hits the above-mentioned one and the other shock absorbers 8 and 14 and is pressed from the left and right by the one and the other shock absorbers 8 and 14, The first and fourth intermediate rubbers 9, 11, 15, and 17 are compressed layers.
This layer is compressed when the compression width of 0, 16 almost reaches the limit. Further, the first and second hard rubbers 12, 18
Are the compression widths of the first and second soft rubbers 10 and 16 and the first to fourth intermediate rubbers 9, 11, 15 and 17.
The compression width of the first and second hard rubbers 12 and 18 is a layer that is compressed when the compression width of the rubber hardly reaches the limit.
The compression width is very small as compared with the compression width of the first to fourth intermediate rubbers 9, 11, 15, and 17, and is set to such a hardness that almost no compression is possible. Further, the spherical body 7 is provided inside the one and other shock absorbers 8 and 14.
Can roll freely in almost 300 directions in all directions.
The distance obtained by adding the compression width of the one and other shock absorbers 8 and 14 to the 300 mm is the displacement amount at which the spherical body 7 can roll.

Next, the operation and effect of the seismic isolation device 1 will be described. A line graph 19 shown in FIG. 5 is a graph showing the relationship between the displacement of the sphere 7 and the load due to the seismic motion. The vertical axis P indicates the sphere 7 and the structure placed on the sphere 7. This load is shown, and the horizontal axis δ shows the amount of displacement of the sphere 7. The polygonal line 20 is a polygonal line indicating a load applied to a structure such as the spherical body 7 and the upper support plate 3 placed on the spherical body 7 with respect to the displacement amount of the spherical body 7. When an earthquake occurs, the foundation concrete A, the base plate B, and the lower support plate 2 as the ground oscillate. In the case of the seismic isolation device 1 according to the first embodiment, when the amplitude stroke is within 300 mm on both the left and right sides, the sphere 7 rolls with the amplitude of the lower support plate 2. It is not transmitted to the upper support plate 3, and as a result, the entire lightweight structure including the H-shaped rope S, the wooden base W, and the columns (not shown) is protected from the seismic motion. This state is the range of A shown in the line graph 19, and the line 2
0 rises rapidly with the occurrence of the earthquake,
Are freely rolling in the range of 300 mm in the left and right directions, the load applied to the sphere 7 and the structure mounted on the sphere 7 is kept constant at a low value.

The amplitude stroke of the lower support plate 2 due to the earthquake is large, and the range in which the sphere 7 rolls is 3
In the case of a ground motion exceeding 00 mm, as shown in FIG.
4 and is pressed from both sides by the one and the other shock absorbers 8 and 14. However, since the sphere 7 is formed of iron, it does not deform even when pressed by the one and the other shock absorbers 8 and 14, and the one and the other shock absorbers 8 and 14 are not deformed.
Is compressed from the inside, thereby absorbing the shock transmitted to the sphere 7 and the structure placed on the sphere 7.
For example, when the lower support plate 2 oscillates rightward in FIG. 4, the other shock absorber 1
4 is compressed from the inside, and the one shock absorber 8 is compressed from the inside by the lower part of the sphere 7. In this case, first, the first and second soft rubbers 10 and 16 constituting the one and the other shock absorbers 8 and 14 are first compressed. This state is the state A shown in the line graph 19, and the line 20 rises relatively slowly,
Since the first and second soft rubbers 10 and 16 serve as a cushioning material and absorb shock, the load applied to the sphere 7 and the structure placed on the sphere 7 is free. It does not increase so much even when compared to a state in which it can roll.

The amplitude stroke of the sphere 7 due to the seismic motion is further increased, and the first and second soft rubbers 10, 1
When the compression width of 6 reaches almost the limit, in addition to the first and second soft rubbers 10 and 16, the first to fourth intermediate rubbers 9, 11, 15, and 17 are compressed. This state is the state of C shown in the line graph 19, and in addition to the load when the first and second soft rubbers 10 and 16 are compressed, the first to fourth intermediate rubbers 9, 11, 15, 17
Is added because the load at the time of compression is added.
Rises to almost twice the angle in the state of (1). Even in this state, the first to fourth
Since the intermediate rubbers 9, 11, 15, 17 serve as shock absorbing materials to absorb shocks, the sphere 7 and the structure mounted on the sphere 7 are sufficiently protected from seismic motion. .

The amplitude stroke of the sphere 7 due to the seismic motion is further larger than in the above state, and the first and second soft rubbers 10 and 16 and the first to fourth middle rubbers 9 and 1 are used.
When the compression width of 1, 15, 17 reaches almost the limit, in addition to these, the first and second hard rubbers 12, 18 are compressed, but the first and second hard rubbers 12, 18 are compressed. 1
As described above, the compression width of line 8 is very small and has little effect as a cushioning material.
0 sharply rises from the state of c and becomes almost vertical. Therefore, the load applied to the spherical body 7 and the structure placed on the spherical body 7 rises rapidly. That is, if the amplitude stroke of the sphere 7 due to the seismic motion is within the range of A, A, and C shown in the line graph 19, the seismic isolation device 1 rolls the sphere 7 and the one and other impacts. Due to the compressing action of the absorbers 8 and 14, a sufficient seismic isolation effect can be exerted on the structure placed on the sphere 7.

Therefore, according to the seismic isolation device 1, an extremely good seismic isolation effect can be exhibited by the rolling operation of the sphere 7. Further, even if the seismic motion is strong and the amplitude stroke of the lower bearing plate 2 is large and exceeds the range in which the sphere 7 can roll freely, the upper surface of the lower bearing plate 2 constituting the seismic isolation device 1 has The upper bearing plate 3, which also constitutes the seismic isolation device 1, is formed.
Since the other stopper portion 13 is formed on the lower surface of the base member 7, it is possible to effectively prevent the risk that the sphere 7 falls off from the lower support plate 2 to the outside. Further, since the one and other shock absorbers 8 and 14 are adhered to the inner peripheral surfaces of the one and other stopper portions 6 and 13, the one and other shock absorbers 8 and 14 are compressed. This not only makes it possible to extremely effectively reduce the impact and the impact sound transmitted to the structure mounted on the sphere 7, but also separates the damper and the like as in the conventional seismic isolation structure. Since it is not necessary to perform the construction, the construction cost can be greatly reduced, and it can be provided to the purchaser at a low price.

Next, the seismic isolation device 30 according to the second embodiment
Will be described. This seismic isolation device 30 is shown in FIGS.
As shown in FIG. 7, a lower support plate 31 fixed on a base plate B, a sphere 32 rotatably mounted on the upper surface of the lower support plate 31, and an upper portion supported by the sphere 32 And a support plate 33.

The lower support plate 31 is formed of iron in a substantially square shape, and has four corners through which first to fourth bolts 34, 34, 34, 34 are inserted (reference numerals are omitted). ) Is formed. And the lower support plate 3
1 is provided with a stopper 3 so as to surround the spherical body 32.
5 is fixed. The one stopper portion 35 is formed in a ring shape from iron, and is fitted in a circular groove portion 31 a formed on the upper surface of the lower support plate 2.

A shock absorber 36 constituting the present invention is adhered to the inner peripheral surface of the stopper 35. As shown in FIG. 7, the shock absorber 36 is similar to the one and the other shock absorber spheres 8 and 14 described in the seismic isolation device 1 according to the first embodiment. A first intermediate rubber 37 having an outer peripheral surface adhered to the inner peripheral surface and formed in a ring shape; and an outer peripheral surface formed on the inner peripheral surface of the first intermediate rubber 37 similarly formed in a ring shape. A soft rubber 38 having a hardness lower than that of the first medium rubber 37 and a second medium formed in a ring shape by bonding an outer peripheral surface to an inner peripheral surface of the soft rubber 38. The rubber 38 is also formed into a ring shape and has an outer peripheral surface adhered to the inner peripheral surface of the second intermediate rubber 38 to have a hardness higher than that of the first and second intermediate rubbers 37 and 39. And high hard rubber 40.

On the upper surface of the lower bearing plate 31 and inside the shock absorber 36, the sphere 32 similar to the sphere 7 described in the seismic isolation device 1 according to the first embodiment is provided. It is placed. The upper support plate 33 is
The upper surface is supported by the sphere 32 and is fixed to the H-shaped steel S by a bolt (not shown). In addition, the lower surface of the upper support plate 33 is formed in a conical shape as shown in FIG. 7 in order to restore the light-weight structure to its original position when the earthquake ends. Also in the seismic isolation device 30 according to the second embodiment, the structure can be effectively protected from vibration and impact due to an earthquake, similarly to the seismic isolation device 1 according to the first embodiment. In particular, this seismic isolation device 3
Since the number 0 is small in number of parts, the construction period can be shortened, and it can be provided at a lower price.

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041]

Next , a seismic isolation device 300 according to a second embodiment will be described. The seismic isolation device 300, FIG. 8
And FIG. 9, the lower portion bearing plate 301, the spherical body 302 made is placed on the upper surface of the lower support plate 301, it is placed on the lower support plate 301 so as to surround the spheres 302 A first shock absorber 303 and an upper support plate 304 supported on the spherical body 302.

The lower support plate 301 has a bottom portion 301a formed substantially in a disk shape, and one stopper portion 301b rising from the periphery of the bottom portion 301a. Then, a second shock absorber 305 is adhered to the inner peripheral surface of the one stopper portion 301b.
The second shock absorber 305 has the same height as the upper surface of the one stopper portion 301b, and is formed of a medium rubber into a ring shape. Then, the lower support plate 301
The sphere 302 is rollably mounted on the upper surface of the, and the upper bearing plate 304 is supported on the sphere 302. The upper support plate 304 includes an upper plate 304a formed in a disk shape, and another stopper portion 304b hanging down from a peripheral edge of the upper plate 304a. On the inner peripheral surface of the other stopper portion 304b, a third
Are bonded. The third shock absorber 306 has the same height as the lower surface of the stopper 304b and is formed of a medium rubber into a ring shape.

On the upper surface of the lower support plate 301,
The first shock absorber 30 surrounds the sphere 302.
3 is movably mounted on the lower support plate 301. The first shock absorber 303 includes an intermediate ring body 307 formed of rubber,
7 is provided with an upper ring body 308 having a lower surface adhered to the upper surface and integrally formed of iron, and a lower ring body 309 having an upper surface adhered to the lower surface of the intermediate ring body 307 and integrally formed of iron. ing. The upper ring body 30
8 is formed at the same height as the third shock absorber 306, and the lower ring body 309 is formed at the same height as the second shock absorber 305. The inner ring 310 is bonded to the inner peripheral surface of the intermediate ring 307. This inner ring body 310
Is formed of hard rubber, and the outer peripheral surface is bonded to the inner peripheral surface of the intermediate ring body 307. The height of the inner ring 310 is substantially equal to the length from the lower surface of the lower ring 309 to the upper surface of the upper ring 308.

[0045] Even seismic isolation device 300 according to the above-described configuration, the structure that is supported by the spherical body 302 is protected from seismic motion, even when ground motion is strong amplitude stroke of the lower support plate 301 is large, FIG. 9 As shown in FIG. 5, the second and third shock absorbers 305 and 306 are compressed to absorb the seismic motion, and the intermediate ring body 307 and the inner ring body 310 constituting the first shock absorber 303 are extended. To absorb the ground motion. Therefore, even in the case of an earthquake motion in which the amplitude stroke of the lower support plate 301 is maximized, a large impact or impact sound is not transmitted to the structure, and the user can live with peace of mind.

[0046]

[0047]

As is clear from the above description of the seismic isolation device according to each embodiment of the present invention, first, in the seismic isolation device according to the first invention (the invention according to claim 1), an earthquake When the lower support plate oscillates, the sphere rolls on the lower support plate, so that the seismic motion is not transmitted to the structure supported by the sphere, and the structure is effectively protected from earthquake. Is done. In addition, since a ring-shaped stopper portion surrounding the sphere is formed on the upper surface of the lower support plate and / or the lower surface of the upper support plate, even if the amplitude stroke of the lower support plate is large, the lower stopper plate may be used. There is no danger of the sphere falling off the lower bearing plate. Further, since the ring-shaped shock absorber is adhered to the inner peripheral surface of the stopper, the amplitude stroke of the lower support plate is large, and even if the stopper collides with the sphere, the shock absorber is not affected. Since the body acts as a cushioning material to absorb the shock, a large shock or impact sound is not transmitted to the structure supported by the sphere, and sufficient seismic isolation performance can be exhibited. In addition,
In Ming, the shock absorber is composed of a first intermediate layer and a second intermediate layer.
The lower support plate is formed by sandwiching the soft layer.
Extremely large ground motions
An effective vibration damping effect can be obtained.

In the seismic isolation device according to the second invention (the invention according to claim 2), the seismic isolation device is bonded to the inner peripheral surface of the stopper portion.
The elastic body is compressed to absorb the seismic motion,
The intermediate ring body and inner ring body that constitute the body
Because it absorbs the seismic motion, the amplitude
Even if the ground motion is the largest,
Extremely high seismic isolation effect without transmission of shocks and impact sounds
be able to.

Further, in the seismic isolation structure according to the third invention (the invention according to claim 3), the rolling of the sphere causes an extreme
Good seismic isolation effect and the shock absorber
Is extremely good for ground motion with large amplitude stroke
A structure supported by a sphere because it exhibits a strong vibration damping effect
There is no transmission of shock or impact noise due to the earthquake.

[0050]

[0051]

[0052]

[0053]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a seismic isolation structure using a seismic isolation device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a lower support plate included in the seismic isolation device according to the first embodiment.

FIG. 3 is a side sectional view showing the seismic isolation device according to the first embodiment. FIG.

FIG. 4 is a side cross-sectional view showing a state where a lower support plate is oscillated and a shock absorber is compressed.

FIG. 5 is a graph showing a relationship between a displacement amount of a sphere due to a seismic motion of the seismic isolation device according to the first embodiment and a load applied to the sphere.

FIG. 6 is a plan view showing a lower support plate constituting the seismic isolation device according to the second embodiment.

FIG. 7 is a side sectional view showing a seismic isolation device according to a second embodiment.

FIG. 8 is a side sectional view showing a first shock absorber constituting a seismic isolation device according to a third embodiment.

FIG. 9 shows a state in which the lower support plate is oscillated, the second and third shock absorbers are compressed, and the intermediate ring body and the inner ring body constituting the first shock absorber are extended. It is a side sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Lower support plate 3 Upper support plate 6 One stopper part 7 Sphere 8 One shock absorber 9 First medium rubber 10 First soft rubber 11 Second medium rubber 12 First hard Rubber 13 The other stopper portion 14 The other shock absorber 15 Third medium rubber 16 Second soft rubber 17 Fourth medium rubber 18 Second hard rubber 30 Seismic isolation device 31 Lower support plate 32 Sphere 33 Upper Support plate 35 Stopper portion 36 Shock absorber 37 Medium rubber 38 Soft rubber 39 Medium rubber 40 Hard rubber 301 Lower support plate 302 Sphere 303 First shock absorber 304 Upper support plate 305 Second shock absorber 306 Third Shock absorber 307 Intermediate ring body 308 Upper ring body 309 Lower ring body 310 Inner ring body

Claims (3)

(57) [Claims] 1. A lower bearing plate fixed to a ground side,
A sphere that is rollably mounted on the lower support plate,
The lower support is supported by the sphere and sandwiches the sphere.
An upper support plate fixed above the support plate.
On the upper surface of the lower support plate and / or the lower surface of the upper support plate.
Has a ring-shaped stopper portion surrounding the sphere.,  On the inner peripheral surface of this stopper portion, surround the sphere and
Outside a ring-shaped shock absorber made of rubber or elastic foam
The peripheral surface is not gluedAlong with This shock absorber is a ring-shaped hard
And a first layer formed in a ring shape outside the hard layer.
And a ring-shaped outer layer of the first intermediate layer
Soft layer and a ring formed outside of the soft layer.
A second intermediate layer formed Disclaimer characterized by
Quake device. (2)A lower support plate fixed to the ground
A sphere that is rollably mounted on the lower support plate,
A sphere is supported on the lower support plate with the sphere interposed
And an upper support plate fixed to the
To The upper surface of the lower support plate and the lower surface of the upper support plate
A ring-shaped stopper that has the same diameter and surrounds the sphere
Each is formed, A ring-shaped elastic body is provided on the inner peripheral surface of these stoppers.
While being fixed, A half of the sphere surrounds the sphere inside the stopper.
Ring-shaped impact that is longer than the diameter
An absorber is placed movably in the radial direction of the stopper.
This shock absorber is made of soft rubber or elastic foam
An intermediate ring body consisting of
The outer peripheral surface is bonded to the upper support plate.
The ring faces the inner peripheral surface of the
Upper ring body formed and lower surface of the intermediate ring body
The upper surface is adhered to the outer peripheral surface formed on the lower support plate
A ring shape made of metal material, facing the inner peripheral surface of the stopper
Of the lower ring body molded into
The outer peripheral surface is bonded to the inner peripheral surface, and the height is
From the lower surface of the lower ring to the upper surface of the upper ring length
And an inner ring body that is substantially equal to
 A seismic isolation device characterized in that: 3. The seismic isolation device according to claim 1 or 2 is provided.
Seismic isolation structure for light-weight structures characterized by being separated
Build.