JP2000038857A - Vibration isolating device and construction of vibration isolation of lightweight structure equipped with the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an epoch-making vibration isolating device, by which the generation of a large impulsive sound due to vibrations by an earthquake can be reduced effectively as a constant range or limitation capable of corresponding to the amplitude stroke of the expected earthquake is set while no large labor is required even in replacement works, the term of works is not lengthened remarkably, and cost can be suppressed, and the construction of vibration isolation of a lightweight structure, on which the vibration isolating device is mounted. SOLUTION: The vibration isolating device has a lower bearing plate 2 fixed on the ground side, a spherical body 5 placed on the lower bearing plate 2 in a rollable manner, an upper bearing plate 3 borne to the spherical body 5, fixed to the upper section of the lower bearing plate 2 while holding the spherical body 5 and fastened on the lightweight structure side, ring-shaped stopper sections 7, 9 being formed on the top face of the lower bearing plate 2 and/or the underside of the upper bearing plate 3 while surrounding the spherical body 5, and one impulse absorbers 8, 10 fixed on the inner circumferential surfaces of the stopper sections 7, 9 and composed of a rubber or elastic foam while being molded in a ring shape. The other impulse absorbers 6 molded in an approximately cylindrical shape are fastened extending over the outer circumferential surface of the upper bearing plate from the outer circumferential surface of the lower bearing plate 2.

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, an upper structure is supported from below by a laminated rubber in which a rubber plate and an iron plate are alternately stacked. Have been proposed, and some have been put to practical use. 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, width or diameter of the lower and upper bearing plates on which the spheres are mounted may be designed to be long. However, if these lower and upper support plates are long, they will not only increase costs, but also limit the site area of the house, as well as the adjacent houses, fences and other structures. In consideration of the distance, it is virtually impossible to make the device infinitely 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]

Means for Solving the Problems The present invention has been proposed to achieve the above object, the first to sixth inventions are seismic isolation devices, and the sixth invention is a light weight structure. It is a seismic isolation structure. Therefore, the first invention (the invention according to claim 1) includes a lower bearing plate fixed to the ground, a sphere rollably mounted on the lower bearing plate, and a sphere supported by the sphere. An upper support plate fixed above the lower support plate and fixed to the lightweight structure side with the sphere interposed therebetween, and formed on the upper surface of the lower support plate and / or the lower surface of the upper support plate. A ring-shaped stopper portion surrounding the sphere, and one of the shock absorbers fixed to the inner peripheral surface of the stopper portion and made of rubber or elastic foam and formed into a ring shape. The other shock absorber, which is formed into a substantially cylindrical shape, is fixed from the outer peripheral surface of the support plate to the outer peripheral surface of the upper support plate.

The material of one of the shock absorbers or the other of the shock absorbers constituting the first invention may be, for example,
Natural rubber (latex rubber), styrene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, ethylene-propylene rubber, acrylic rubber, urethane rubber, silicone rubber,
Synthetic rubber such as fluororubber and polysulfide rubber, or thermoplastic elastomer can be used. Examples of the thermoplastic elastomer include olefin elastomers (polyethylene elastomer, polypropylene elastomer), amide elastomers (polyamide elastomer), styrene elastomers (styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylenebutylene-styrene). Copolymer), polyurethane, and urethane-based elastomer. As the urethane-based elastomer, thermoplastic polyether polyurethane,
Thermoplastic polyurethane such as thermoplastic polyester polyurethane can be fried. In addition, more specifically, as the rubber, a trademark “Hanenit” related to the manufacture of Naigai Rubber Co., Ltd. or a trademark “Haplagel” related to the manufacture of Daiichi Denko Corporation may be used. As other materials, sponge-like polyurethane porous materials, polyvinylpormar porous materials, or elastic foams such as urethane foam, cellulose foam, and nylon foam can be used. More specifically, as the elastic foam, a trademark “Memory Foam” made of polyurethane foam and sold by Casey Shokai Co., Ltd. may be used.

The second invention (the invention according to claim 2)
According to the first aspect of the present invention, the other shock absorber has a slack portion formed in a circumferential direction. Note that the slack portion may be formed in the circumferential direction of the other shock absorber, and the number thereof may be singular or plural. It may be formed by molding.

The third invention (the invention according to claim 3)
In the first or second invention, the lower side of the other shock absorber is fixed to the lower support plate by one of the ring-shaped fastening members formed of a metal material, The upper side of the absorber is fixed to the upper support plate by the other fastening member formed into a ring shape from a metal material.

A fourth invention (the invention according to claim 4)
In the first, second or third aspect of the present invention, the other shock absorber may be a first shock absorber which is disposed on the innermost side and which is integrally formed of rubber. A second shock absorber provided outside the absorber and integrally formed of rubber having a hardness higher than that of the first shock absorber, and a second shock absorber provided outside the second shock absorber. And a third shock absorber integrally formed of rubber having a higher hardness than the second shock absorber.

The materials of the first shock absorber, the second shock absorber, and the third shock absorber constituting the fourth invention are each made of the above-mentioned rubbers having three different hardnesses. The rubbers may be appropriately extracted and the rubbers may be arranged in any order in the radial direction of each shock absorber. And the kind of rubber that can be used as the first shock absorber having the lowest hardness is
Although it is relatively determined in relation to the material of the second and third shock absorbers, for example, urethane rubber, acrylic rubber, fluorine rubber, or the like can be used. When the first shock absorber is made of each of the above rubbers, the type of rubber that can be used as the material of the second shock absorber is, for example, nitrile rubber, butyl rubber, ethylene propylene rubber, or the like. As the rubber that can be used as the material of the third shock absorber, natural rubber, styrene rubber, silicone rubber, thermoplastic elastomer, or the trademark “Haplagel” manufactured by Dai-Ichi Denko KK can be used. Can also.

A fifth invention (an invention according to claim 5)
In the first, second, third or fourth aspect of the invention, the other shock absorber is fixed to an outer peripheral surface of the stopper portion.

The sixth invention (the invention according to claim 6)
Is a seismic isolation structure for a light-weight structure, wherein any one of the seismic isolation devices according to the first to fifth aspects is provided.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, 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 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. In this seismic isolation structure, as shown in FIG. 1, a disc-shaped base plate (not shown) is fixed on a foundation concrete A, which is a ground, by anchor bolts.
Lower bearing plate 2 constituting seismic isolation device 1 according to the embodiment of the present invention
(Not shown in FIG. 1) is fixed, and a sphere 5 (not shown in FIG. 1) described later is interposed between the upper surface of the lower support plate 2 and a first base described later. Is provided with an upper support plate 3 fixed to the lower surface. That is, in the present embodiment, the seismic isolation device 1 configuring the present invention
A lower support plate 2 fixed to the base plate, a sphere 5,
Upper support plate 3 fixed to the base constituting the light weight structure
It is composed of On the upper surface of the upper support plate 3, H-shaped steel S as a first base is provided with bolts N, N,
N, a wooden base W as a second base is fixed to the upper surface of the H-shaped rope S. 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, and the lower support plate 2 that are the ground oscillate, and a sphere (not shown) rolls with the amplitude of the lower support plate 2. 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. In addition, 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 support plate 2 fixed by bolts 4 and 4 to a base plate (not shown) fixed on the foundation concrete A by bolts (not shown), and an upper surface of the lower support plate 2 The upper surface is fixed to the lower surface of a spherical body 5 mounted so as to be able to roll and an H-shaped steel S as a first base constituting a light weight structure, and the spherical body 5
And a second other shock absorber 6 fixed from the lower support plate 2 to the outer peripheral surface of the upper support plate 3.

The lower support plate 2 is formed in a disk shape from iron, and has an insertion hole (symbol is omitted) through which the bolts 4 and 4 are inserted. One stopper 7 is fixed to the upper surface of the lower support plate 2 so as to surround the sphere 5. The one stopper portion 7 is a member for preventing the sphere 5 from falling off from the upper surface of the lower support plate 2 when the foundation concrete A as the ground oscillates during an earthquake,
As shown in FIG. 3, it is formed in a ring shape by iron, and is fitted in a groove 2a formed in a ring shape on the upper surface of the lower support plate 2. 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 allows the amplitude stroke of the lower support plate 2 to reach the maximum allowable range during an earthquake,
This is a member for preventing the sphere 5 from colliding with the one stopper portion 7 to generate a loud impact sound and vibration, and as shown in FIG. 2, the whole shape is formed in a ring shape. In addition, in the present embodiment, it is formed of urethane foam which is an elastic foam. And
The spherical body 5 is placed on the upper surface of the lower support plate 2 and inside the one shock absorber 8. The sphere 5 is formed of iron and rolls on the upper surface of the lower support plate 2 when the foundation concrete A, which is the ground, oscillates in the horizontal direction during an earthquake. It is configured so that seismic motion is not transmitted to.

Next, the upper support plate 3 will be described. The upper support plate 3 is supported by the spherical body 5 and has an upper surface fixed to the H-shaped steel S by bolts N, N, N. The upper support plate 3 is formed in a disk shape from iron in the same manner as the lower support plate 2. In addition, the lower surface of the upper support plate 3 is formed as a conical concave surface 3a as shown in FIG. 3 in order to restore the light-weight structure to its original position when the earthquake ends. A ring-shaped groove 3b is formed on the lower surface of the upper support plate 3 similarly to the lower support plate 2, and the other stopper 9 is fitted in the groove 3b. The other stopper portion 9 is formed in a ring shape from iron similarly to the one stopper portion 7 described above. One shock absorber 10 is adhered to the inner peripheral surface of the other stopper 9 in the same manner as the one stopper 7. In this one shock absorber 10, the amplitude stroke of the lower support plate 2 reaches the maximum allowable range in the event of an earthquake, and the sphere 5 collides with the other stopper 9 to generate a large impact sound and vibration. Is formed in a ring shape and is formed of urethane foam.

The other shock absorber 6 according to the present invention is fixed from the outer peripheral surface of the lower support plate 2 to the outer peripheral surface of the upper support plate 3. This other shock absorber 6
Expands and contracts when the lower support plate 2 is vibrated due to an earthquake, suppresses the amplitude stroke and the amplitude speed of the lower support plate 2 and greatly reduces the vibration and impact transmitted to the structure supported by the sphere 5. It is a member for suppressing to. In the present embodiment, the other shock absorber 6 is formed from a natural rubber into a substantially cylindrical shape, and as shown in FIG. 3, a slack portion 6a, a lower end side fixing portion 6b,
And an upper fixing portion 6c. The lower fixing portion 6b is a portion fixed to the outer peripheral surface of the lower support plate 2, and has an insertion hole (not shown) through which a bolt described later is inserted. Also, the upper fixing portion 6c
Is a portion fixed to the outer peripheral surface of the upper support plate 3, and has a large number of insertion holes (not shown) through which bolts to be described later are inserted, similarly to the lower fixing portion 6b. The slack portion 6a is formed in a circumferential direction of the other shock absorber 6, and is formed so as to bulge outward in an arc shape. One fastening member 11 is fitted on the outer peripheral surface of the lower fixing portion 6b constituting the other shock absorber 6. This one fastening member 11
Is made of iron and formed into a ring shape.
An insertion hole (not shown) through which the reference numeral 2 is inserted is formed. Further, the upper fixing portion 6c constituting the other shock absorber 6
The other fastening member 13 is fitted on the outer peripheral surface of the second member.
The other fastening member 13 is formed in a ring shape from iron and has an insertion hole (not shown) through which a number of bolts 14 are inserted. That is, the other shock absorber 6 is fixed to the outer peripheral surfaces of the lower support plate 2 and the upper support plate 3 by the large number of bolts 12 and 14 via the one and other fastening members 11 and 13. I have.

Next, the operation and effects of the seismic isolation device 1 will be described. FIG. 7 is a graph 40 showing a relationship between a displacement amount δ of the sphere 5 due to an earthquake motion and a load P applied to a structure supported by the sphere 5. Immediately after the earthquake, a slight load is applied to the structure due to the resistance between the sphere 5 and the lower support plate 2 and the upper support plate 3, but when the ground side (several support plates 2) is further displaced, the sphere 5 rolls. When the displacement is started and the displacement is within the range of the slack of the slack portion 6a constituting the other shock absorber 6, the load δ does not change on the structure. That is, the area shown as a in FIG. 7 is effectively seismically isolated except immediately after the occurrence of the earthquake, and the load P is not applied to the structure. And, when the ground side is displaced beyond the range of the slack portion 6a of the other shock absorber 6,
Gradually, the other shock absorber 6 is extended as shown in FIG. Due to the extension of the other shock absorber 6, a load P is gradually applied to the structure via the other shock absorber 6. Therefore, although the load P is slightly applied to the structure by the elastic force of the other shock absorber 6, the sphere 5
The impact force between the first and second stopper portions 7 and 9 is reduced. In addition, the one and the other stopper portions 7, 9
, One of the shock absorbers 8 and 10 is fixed, so that the spherical body 5 and the one and other stopper portions 7 and 9 are further increased.
And the impact force is reduced.

Therefore, according to the seismic isolation device 1, an earthquake having a long amplitude stroke occurs when the area of the lower support plate 2 or the upper support plate 3 is reduced due to the site area of the building or other reasons. In this case, the collision between the sphere 5 and the stoppers 7 and 9 can be mitigated by the one shock absorbers 8 and 10, and the seismic isolation effect is slightly reduced by the other shock absorber 6. However, it is possible to sufficiently avoid the generation of a large impact or an impact sound, and it is also possible to avoid the risk that the sphere 5 falls off from the one and the other stopper portions 7 and 9. In particular, in the above embodiment, since the other shock absorber 6 is formed with the slack portion 6a, if the amplitude stroke is short, the seismic isolation effect is not reduced at all. Also, in the seismic isolation device 1, the above-described operation and effect can be realized by the components of the seismic isolation device 1, and there is no need to separately install a damper or the like unlike the conventional seismic isolation structure, so The cost can be greatly reduced, and it becomes possible to provide the purchaser with the seismically isolated house which has been considered expensive at a low price. in addition,
Since the shock absorber 6 is fixed from the outer peripheral surface of the lower support plate 2 to the outer peripheral surface of the upper support plate 3, dust or dirt is formed in a gap between the lower support plate 2 and the upper support plate 3. There is no danger of foreign matter such as sand and dust entering, and smooth rolling of the sphere 5 can be maintained.

Next, the seismic isolation device 2 according to the second embodiment
0 will be described. As shown in FIG. 5, the seismic isolation device 20 includes a lower bearing plate 21 fixed to a base plate (not shown), a sphere 22 rollably mounted on the upper surface of the lower bearing plate 21, The upper bearing plate 23 supported by the sphere 22 and the upper bearing plate 2 from the lower bearing plate 21
3 is provided with first to third shock absorbers 24, 25, and 26, which are fixed over the outer peripheral surface.

The lower support plate 21 is formed in a disk shape from iron, and has through holes (not shown) through which bolts 27 are inserted. On the upper surface of the lower support plate 21, one stopper portion 28 formed of iron in a ring shape so as to surround the sphere 22 is formed in a groove 21 a formed in a ring shape on the upper surface of the lower support plate 21. Is fitted. On the inner peripheral surface of the one stopper portion 28, one shock absorber 29 formed in a ring shape with nylon foam is adhered. The spherical body 22 made of iron is placed on the upper surface of the lower bearing plate 21 and inside the one shock absorber 29. Next, the upper support plate 23
Will be described. The upper bearing plate 23 is provided with the sphere 2
2 and the upper surface is fixed to the H-section steel S by bolts N, N, N. The upper support plate 3 is formed in a disk shape from iron similarly to the lower support plate 21, and has a conical concave surface 23 on the lower surface.
a is formed. Similarly to the lower support plate 21, a ring-shaped groove 23 is formed on the lower surface of the upper support plate 3.
The other stopper portion 30 formed of iron in a ring shape is fitted in the groove portion 23b. Then, on the inner peripheral surface of the other stopper portion 30,
One of the shock absorbers 31 is bonded.

The first to third shock absorbers 24, 25 and 26 are fixed from the outer peripheral surface of the lower support plate 21 to the outer peripheral surface of the upper support plate 23. The first to third shock absorbers 24, 25, 26 are the other shock absorbers constituting the present invention. And the first
The shock absorber 24 is formed of an elastic natural rubber into a substantially cylindrical shape, and as shown in FIG. 5, a first slack portion 24a, a first lower fixing portion 24b, and a first lower fixing portion 24b. And the upper fixing portion 24c. The first lower fixing portion 24b is a portion fixed to the outer peripheral surface of the lower support plate 21, and has an insertion hole (not shown) through which a bolt (not shown) is inserted. The first upper fixing portion 24c is a portion fixed to the outer peripheral surface of the upper support plate 23, and like the first lower fixing portion 24b, a large number of unillustrated bolts through which unillustrated bolts are inserted. Are formed. Also, the first slack portion 24a
Is a portion which firstly expands due to the displacement of the lower support plate 21 and is for securing a range in which the sphere 22 can freely roll, and is bulged outward in an arc shape. Further, the second shock absorber 25 is formed in a substantially cylindrical shape, and as shown in FIG.
5a, a second lower fixing portion 25b, and a second upper fixing portion 25c. The second shock absorber 25 is formed of a nitrile rubber having a higher hardness than the first shock absorber 24, and has a slightly larger diameter than the first shock absorber 24. is there. The second lower fixing portion 25b is a portion fixed to the outer peripheral surface of the lower support plate 21 via the first lower fixing portion 24b constituting the first shock absorber 24. An insertion hole (not shown) into which the bolt (not shown) is inserted is formed. Further, the second upper fixing portion 25c is
This is a portion fixed to the outer peripheral surface of the upper support plate 23 via a first upper fixing portion 24c constituting the first shock absorber 24, and is the same as the second lower fixing portion 25b. A large number of insertion holes (not shown) into which bolts (not shown) are inserted are formed. Further, the second slack portion 25a
The first slack portion 2a and the first slack portion 24a follow the increase in the amplitude stroke of the lower support plate 21.
The portion extending after 4a is for ensuring a range in which the sphere 22 can freely roll, and bulges outward in an arc shape.

The third shock absorber 26 is formed in a substantially cylindrical shape. As shown in FIG. 5, a third slack portion 26a, a third lower fixing portion 26b, 3 upper fixing portions 26c. The third shock absorber 26 is formed of urethane rubber having a higher hardness than that of the second shock absorber 25, and has a diameter larger than that of the second shock absorber 25. . The third lower fixing portion 26b is connected to the first lower fixing portion 26b.
Is fixed to the outer peripheral surface of the lower support plate 21 via a first lower fixing portion 24b constituting the shock absorber 24 and a second lower fixing portion 25b constituting the second shock absorber 25. And an insertion hole (not shown) through which the bolt (not shown) is inserted. Further, the third upper fixing portion 26c is composed of the first upper fixing portion 24c and the second shock absorber 2 that constitute the first shock absorber 24.
5, a portion fixed to the outer peripheral surface of the upper support plate 23 via the second lower fixing portion 25c constituting the third lower portion 5.
Similarly to the lower fixing portion 26b, a large number of insertion holes (not shown) into which the bolts (not shown) are inserted are formed. Further, the third slack portion 26a, together with the first and second slack portions 24a and 25a, follows the increase in the amplitude stroke of the lower support plate 21 and the first and second slack portions 2a.
4a and 25a, which extend next to each other.
Is to ensure the range in which can freely roll,
It protrudes outward in an arc shape.

One fastening member 32 is fitted on the outer peripheral surface of the third lower fixing portion 26b constituting the third shock absorber 26. This one fastening member 32
Is formed in a ring shape with iron, and has an insertion hole (not shown) through which a number of bolts (not shown) are inserted. The other fastening member 33 is fitted on the outer peripheral surface of the third upper fixing portion 26c constituting the shock absorber 26. The other fastening member 33 is formed in a ring shape from iron and has an insertion hole (not shown) through which a number of bolts (not shown) are inserted. That is, the first to third shock absorbers 24, 25, 26
Via the one and other fastening members 32, 33,
The lower support plate 21 is formed by a number of bolts (not shown).
And is fixed to the outer peripheral surface of the upper support plate 23.

Next, the operation and effects of the seismic isolation device 20 will be described. FIG. 8 is a graph 5 showing the mechanical characteristics of the first to third shock absorbers 24, 25, 26 individually.
0, and the horizontal axis δ is the first to third shock absorbers 2
The vertical length P indicates the load applied by the expansion of the first to third shock absorbers 24, 25, 26. And in this graph 50, the first
The bent line 51 of the first shock absorber 24 with respect to a change in the extension length of the first shock absorber 24 having the lowest hardness.
The second broken line 52 indicates the change in the extension length of the second shock absorber 25 with respect to the change in the extension length of the second shock absorber 25.
Shows the change in the load applied to the shock absorber 25, and the third broken line 53 indicates the third shock absorber 26 having the highest hardness.
5 is a polygonal line showing a change in load applied to the third shock absorber 26 with respect to a change in the extension length of the third shock absorber 26. The line graph 60 shown in FIG. 9 indicates the first to third shock absorbers 2.
When an earthquake occurs in a structure using the seismic isolation device 20 including the components 4, 25, and 26, the displacement amount δ of the sphere 22 due to the seismic motion and the structure supported by the sphere 22 It is a graph which shows the relationship with the load P applied to an object. In the graph 60, the range shown as c is the state where the first shock absorber 24 is extended, and the range shown as d is where the first shock absorber 24 and the second shock absorber 25 are elongated. The range shown as the state and the e is the first to third
This shows a state in which all of the shock absorbers 24, 25, and 26 have been extended, and finally, as shown in FIG. It is in contact with one of the shock absorbers 29 and 31 fixed to the surface.

Therefore, in the seismic isolation device 20 according to the second embodiment, the sphere 22
Approaching the one and the other stopper portions 28, 30, first the elastic force of the first shock absorber 24 is applied as a load on the structure, and then the elastic force of the first shock absorber 24 and the second The resultant force of the second shock absorber 25 and the elastic force of the third shock absorber 26 is applied to the structure as a load, and finally, the resultant force of the resultant force and the elastic force of the third shock absorber 26 is applied to the structure. For this reason, in this seismic isolation device 20, the closer the spherical body 22 approaches the one and the other stopper portions 28, 30, the more the first to third shock absorber 2
Since the resultant force of the elastic forces of 4, 25, and 26 is applied to the structure as a load, the seismic isolation effect is slightly reduced, but the impact force between the sphere 22 and the stopper portions 28 and 30 is reduced. Moreover, the one and the other stopper portions 2
Since one of the shock absorbers 29, 31 is fixed to 8, 30, the impact force between the sphere 22 and the one and other stopper portions 28, 30 is further reduced.

Therefore, even when the seismic isolation device 20 is used, if the area of the lower support plate 21 or the upper support plate 23 is reduced due to the site area of the building or for other reasons, an earthquake having a long amplitude stroke may occur. Is generated, the spherical body 22 and the one and other stopper portions 28, 30 are formed by the first to third shock absorbers 24, 25, 26.
Can be alleviated, and a large impact or impact sound can be sufficiently avoided, and the danger of the spherical body 22 falling off from the one and other stopper portions 28 and 30 can also be avoided. In particular, in the second embodiment, the other shock absorber constituting the present invention is the first shock absorber.
To third shock absorbers 24, 25, 26,
From the first shock absorber 24 to the third shock absorber 26,
Since the hardness is gradually increased, a small load is applied to the structure when the amplitude stroke of the earthquake is short, and a relatively large load is applied to the structure when the amplitude stroke is long. Therefore, in addition to the operation and effect of the seismic isolation device 1 according to the first embodiment described above, it is possible to smoothly absorb and reduce the impact between the sphere 22 and the one and other stopper portions 28 and 30.

Next, the seismic isolation device 7 according to the third embodiment is described.
0 will be described. As shown in FIG. 10, the seismic isolation device 70 includes a lower support plate 71, a sphere 72 rotatably mounted on the upper surface of the lower support plate 71,
An upper support plate 73 supported by the second support plate 2 and one stopper portion 74 fixed to the upper surface of the lower support plate 71;
The other stopper portion 75 fixed to the lower surface of the upper support plate 73, and the one and other stopper portions 74, 7
5, the other shock absorber 76 fixed to the outer peripheral surface of
It has.

The lower support plate 71 has the same structure as the lower support plate 2 described in the first embodiment, and is fixed to a base plate (not shown) by a plurality of bolts 77,77. ing. And the lower bearing plate 7
One of the grooves 71a is formed on the upper surface of the first groove 1. One of the stoppers 74 having the same configuration as the one of the stoppers 6 described in the first embodiment is formed in the one groove 71a. Fixed. And the lower bearing plate 7
The spherical body 72 formed of iron is rollably mounted on the upper surface of the inside 1 and inside the one stopper portion 74. The upper bearing plate 73 is placed on the sphere 72. The upper support plate 73 has the same configuration as the upper support plate 3 described in the first embodiment, and has a conical concave surface 73a on the lower surface and the other groove 73b. The other stopper portion 75 is fixed in the other groove 73b. Then, the one and other stopper portions 7
One of the shock absorbers 78, 79 is adhered to the inner peripheral surfaces of the shock absorbers 4 and 75, similarly to the seismic isolation device 1 described in the first embodiment.

The other shock absorber 76 is similar to the shock absorber 6 described in the first embodiment.
It is formed of a loosened portion 76a formed into a ring shape with natural rubber and having a slack outside, a lower fixed portion 76b, and an upper fixed portion 76c. The lower fixing portion 76b is fixed to an outer peripheral surface of the one stopper portion 74 by a bolt (not shown).
c is fixed to the outer peripheral surface of the other stopper 75 by a bolt (not shown). That is, the other shock absorber 76 covers the outer peripheral surfaces of the one and other stopper portions 74 and 75 from the outer peripheral surface of the one stopper portion 74 to the outer peripheral surface of the other stopper portion 75. It is fixed to. In the seismic isolation device 70 according to the third embodiment, similarly to the seismic isolation devices 1 and 20 described in the first or second embodiment, the rolling of the sphere 72 and the other A good seismic isolation effect can be obtained by the expansion of the shock absorber 76 and the compression of the one and other elastic bodies 78 and 79. Particularly, in the seismic isolation device 70 according to the third embodiment, the other shock absorber 76 is fixed from the outer peripheral surface of the one stopper 74 to the outer peripheral surface of the other stopper 75. Therefore, even when the slackness of the slack portion 76a constituting the other shock absorber 76 is secured larger, the entire seismic isolation device 70 does not increase in size.

In the seismic isolation device 20 according to the second embodiment, the first to third shock absorbers 24, 25, and 26 having different hardnesses are used as the other shock absorbers constituting the present invention. Although configured, it is not necessarily required to be in the above-described form, and the number of the other shock absorber may be two or four or more. In the case where the other shock absorber is constituted as a plurality of shock absorbers in this way, each of the shock absorbers is formed of rubber having the same hardness, while the length of the slack portion formed in the middle part (allowance of slack) Range) may be appropriately changed. Further, the slack portion constituting the other shock absorber according to the present invention is not necessarily limited to one, and may be, for example, a plurality of bellows. Further, the other shock absorber does not necessarily have to be fixed with bolts, but may be fixed with an adhesive, or a fastening member may be fitted after bonding with an adhesive.

In each of the seismic isolation devices 1, 20, and 70 according to each of the above embodiments, it is assumed that the shape of the lower bearing plate (the reference numeral is omitted) and the shape of the upper bearing plate are formed in a disk shape. Although described, the lower support plate and the upper support plate need not necessarily be formed in a disk shape, but may be formed in a square shape or a polygonal shape.
Further, in the above embodiment, the stopper portion constituting the present invention is illustrated and described as being fixed to both the upper surface of the lower support plate and the lower surface of the upper support plate. When the absorber is configured to be fixed from the outer peripheral surface of the lower support plate to the outer peripheral surface of the upper support plate, it is not always necessary to fix the absorber to both the lower support plate and the upper support plate. It should just be fixed to. Further, in the above-described embodiment, a configuration in which such a stopper portion is fitted in a groove portion provided in the lower support plate or the upper support plate has been described. It may be welded to the upper surface of the lower support plate and / or the lower surface of the upper support plate.

[0034]

As is clear from the above description of the seismic isolation device according to each embodiment of the present invention, first, the seismic isolation device according to the first invention (the invention according to claim 1) and the sixth In the seismic isolation structure for a light-weight structure according to the invention (invention of claim 6), one of the shock absorbers is fixed to the inner peripheral surface of the stopper portion, and the upper portion of the upper portion extends from the outer periphery of the lower support plate. Since the other shock absorber, which is formed in a substantially cylindrical shape, is fixed to the outer periphery of the support plate, the area of the lower support plate and the upper support plate is slightly reduced due to the site area of the building and other factors. Even in the case where a certain range or limit capable of coping with the expected amplitude stroke of the earthquake is provided, it is possible to effectively reduce the impact or impact sound between the stopper and the sphere. Further, the above-mentioned one and the other shock absorbers realizing such effects are components of the seismic isolation device itself, and are separately provided from the seismic isolation device such as a conventional damper. Since it is not attached to a different place from the above and is not made by a plurality of springs, the construction is extremely simple, the construction period is not significantly extended, and the price can be suppressed. Further, the other shock absorber is formed in a substantially cylindrical shape and covers a gap between the lower support plate and the upper support plate, so that stones or sand are formed on the upper surface of the lower support plate on which the sphere rolls. Alternatively, it is possible to effectively prevent dust or the like from entering and causing a hindrance to smooth rolling of the sphere.

Further, the second invention (the invention according to claim 2)
In the seismic isolation device according to the first aspect, since the other shock absorber constituting the first invention has a slack portion formed in the circumferential direction, the amplitude stroke of the earthquake falls within the slack range of the slack portion. In this case, no load is applied to the structure via the other shock absorber. Therefore, at least within the range of the slack (when the amplitude stroke of the earthquake is short), the seismic vibration can be effectively isolated without transmitting to the structure.

The third invention (the invention according to claim 3)
In the seismic isolation device according to the above, the lower side of the other shock absorber is
One of the ring members formed of a metal material is fixed to the lower support plate by one of the fastening members, and the upper side of the other shock absorber is fixed to the upper support plate by the other fastening member of a metal material. Therefore, the danger of the other shock absorber falling off due to the vibration of the earthquake can be effectively prevented.

The fourth invention (the invention according to claim 4)
In the seismic isolation device according to (1), the other shock absorber is provided inside the first shock absorber integrally formed of rubber, and the other shock absorber is provided outside the first shock absorber. First
A second shock absorber integrally formed of rubber having a higher hardness than the second shock absorber, and a second shock absorber disposed outside the second shock absorber and having a higher hardness than the second shock absorber A third shock absorber integrally formed of rubber,
When the amplitude stroke of the earthquake is short, only a small load is applied to the structure, and when the amplitude stroke is long, a relatively large load is applied to the structure. In addition to the effect of each invention, it is possible to smoothly absorb and reduce the impact between the sphere and the stopper.

The fifth invention (the invention described in claim 5)
In the seismic isolation device according to the above, since the other shock absorber is fixed to the outer peripheral surface of the stopper portion, even if the slack width of the shock absorber is ensured to be large, the entire device is increased in size. Can be prevented.

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

FIG. 5 is a side sectional view showing a seismic isolation device according to a second embodiment.

FIG. 6 is a side cross-sectional view showing a state where the lower support plate is oscillated and the first to third shock absorbers are extended.

FIG. 7 is a graph showing a relationship between a displacement amount of a sphere due to an earthquake motion of the seismic isolation device according to the first embodiment and a load applied to a structure supported by the sphere.

FIG. 8 is a graph showing the mechanical characteristics of the first to third shock absorbers.

FIG. 9 is a graph showing a load applied to a structure supported by a sphere when the first to third shock absorbers extend.

FIG. 10 is a side sectional view showing a seismic isolation device according to a third embodiment.

FIG. 11

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Lower support plate 3 Upper support plate 5 Sphere 6 The other shock absorber 6a Bar barrel right 6b Lower fixed part 6c Upper fixed part 7 One stopper part 8 One shock absorber 9 The other stopper part 10 One shock absorber 11 One fastening member 12 Bolt 13 The other fastening member 14 Bolt 20 Seismic isolation device 21 Lower support plate 22 Sphere 23 Upper support plate 24 First shock absorber 24a First slack portion 24b First Lower fixed part 24c First upper fixed part 25 Second shock absorber 25a Second slack part 25b Second lower fixed part 25c Second upper fixed part 26 Third shock absorber 26a Third Loose part 26b Third lower fixing part 26c Third upper fixing part 26 Third shock absorber 28 One stopper part 29 One shock absorber 30 The other stopper part 31 One shock absorption Body 32 One fastening member 33 The other fastening member 70 Seismic isolation device 71 Lower support plate 72 Sphere 73 Upper support plate 74 One stopper 75 Other stopper 76 Other shock absorber 76a Loose portion 76b Lower fixing portion 76c Upper fixed part 78 One shock absorber 79 One shock absorber

[Procedure amendment]

[Submission date] October 27, 1998 (1998.10.
27)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

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

FIG. 5 is a side sectional view showing a seismic isolation device according to a second embodiment.

FIG. 6 is a side cross-sectional view showing a state where the lower support plate is oscillated and the first to third shock absorbers are extended.

FIG. 7 is a graph showing a relationship between a displacement amount of a sphere due to an earthquake motion of the seismic isolation device according to the first embodiment and a load applied to a structure supported by the sphere.

FIG. 8 is a graph showing the mechanical characteristics of the first to third shock absorbers.

FIG. 9 is a graph showing a load applied to a structure supported by a sphere when the first to third shock absorbers extend.

FIG. 10 is a side sectional view showing a seismic isolation device according to a third embodiment.

[Description of Signs] 1 Seismic isolation device 2 Lower support plate 3 Upper support plate 5 Sphere 6 Other shock absorber 6a Bar barrel right part 6b Lower fixed part 6c Upper fixed part 7 One stopper part 8 One shock absorber 9 The other stopper portion 10 One shock absorber 11 One fastening member 12 Bolt 13 The other fastening member 14 Bolt 20 Seismic isolation device 21 Lower support plate 22 Sphere 23 Upper support plate 24 First shock absorber 24a First slack Part 24b first lower fixing part 24c first upper fixing part 25 second shock absorber 25a second slack part 25b second lower fixing part 25c second upper fixing part 26 third shock absorbing Body 26a Third slack portion 26b Third lower fixing portion 26c Third upper fixing portion 26 Third shock absorber 28 One stopper portion 29 One shock absorber 30 The other stopper portion 31 One shock absorber 32 One fastening member 33 The other fastening member 70 Seismic isolation device 71 Lower support plate 72 Sphere 73 Upper support plate 74 One stopper 75 Other stopper 76 Other shock absorber 76a Loose portion 76b Lower Side fixing part 76c Upper fixing part 78 One shock absorber 79 One shock absorber

Claims (6)

[Claims] 1. A lower support plate fixed to a ground side,
A sphere rollably mounted on the lower support plate,
An upper support plate supported by the sphere, fixed above the lower support plate with the sphere therebetween, and fixed to the light-weight structure side; and an upper surface of the lower support plate and / or a lower surface of the upper support plate. A ring-shaped stopper portion formed and surrounding the sphere, and one shock absorber made of rubber or elastic foam fixed to the inner peripheral surface of the stopper portion and formed into a ring shape; The seismic isolation device is characterized in that the other shock absorber formed in a substantially cylindrical shape is fixed from the outer peripheral surface of the lower support plate to the outer peripheral surface of the upper support plate. 2. The seismic isolation device according to claim 1, wherein the other shock absorber has a slack portion formed in a circumferential direction. 3. The lower side of the other shock absorber is fixed to the lower support plate by one of the ring-shaped fastening members formed of a metal material, and the upper side of the other shock absorber is a metal. The seismic isolation device according to claim 1 or 2, wherein the seismic isolation device is fixed to the upper support plate by another fastening member formed in a ring shape from a material. 4. The first shock absorber, which is provided on the innermost side and integrally formed of rubber, and the other shock absorber is provided on the outer side of the first shock absorber. A second shock absorber integrally formed of rubber having a higher hardness than the first shock absorber, and a second shock absorber disposed outside the second shock absorber and having a hardness higher than that of the second shock absorber. And a third shock absorber integrally formed of high rubber.
Or the seismic isolation device according to 3. 5. The seismic isolation device according to claim 1, wherein the other shock absorber is fixed to an outer peripheral surface of the stopper portion. 6. A seismic isolation structure for a light-weight structure, provided with any one of the seismic isolation devices according to claim 1.