JPH1082207A - Vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent vibrations resulting from wind load, etc., at the normal time to a vibration isolating device, to obviate the application of reaction higher than a fixed value by releasing the rigid constraint of a structure at the time of the burdening of load higher than a fixed value and to avert the increase of the response acceleration of the structure by changing the natural frequency of the structure, etc., in response to load. SOLUTION: The vibration isolating device 1 interposed between a structure S and a foundation F has a support member 9 and a bellows 2 disposed in parallel with the support member 9 on the inside of the support member 9. A laminated vibration isolating rubber 7 is arranged in series with the lower section of the bellows 2, the support member 9 is composed of an inner- circumferential side arcuate section 9a and an outer-circumferential side arcuate section 9b manufactured in an insert type in the vertical direction, and both arcuate sections 9a, 9b are connected through a detaching member 11. The detaching member 11 is constituted so as to be detached by specified set cutting load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a seismic isolation device.
More specifically, in a seismic isolation device interposed between a structure such as a building or a bridge and its foundation and / or between two structures to achieve seismic isolation / vibration control of the structure, For rigidly constraining the substantially vertical relative displacement of the structure and the foundation and / or the substantially vertical relative displacement of the two structures, and for releasing the restraint for elastic restraint. The present invention relates to a seismic device that suppresses vibration applied to a structure to be mounted and prevents a load caused by the vibration from exceeding a predetermined value.

[0002]

2. Description of the Related Art Conventionally, among seismic isolation devices for buildings and the like, those capable of exerting a seismic isolation effect not only on the vibration of the horizontal component but also on the vibration of the vertical component, and mainly on the vibration of the vertical component There are various proposals that can achieve a seismic isolation effect.

For example, JP-A-1-83744 and JP-A-5-302452 disclose a magnetic field generator such as a permanent magnet in a pit formed on a base, and immerse the pit with a gap therebetween. Thus, a seismic isolation device having a magnetic field generator (electromagnet or the like) having a polarity different from the magnetic field generator near the lower end of the structure is disclosed. That is, the weight of the structure is to be supported by magnetic force. In this way, by applying horizontal and vertical magnetic forces between the building and the foundation, the horizontal reaction mechanism and the vertical reaction mechanism can be covered without providing a special support. Is expected. Hereinafter, this seismic isolation device is referred to as Conventional Technology 1.

Japanese Patent Application Laid-Open No. 7-173955 discloses a seismic isolation device in which bellows and laminated seismic isolation rubber are connected in series in the vertical direction. The seismic isolation device is interposed between the structure and the foundation and / or between the two structures, and is intended to reduce the excitation force on the structure by the elasticity of both the bellows and the laminated seismic isolation rubber. It is. Therefore, the weight of the structure is evenly supported by the bellows and the laminated seismic isolation rubber. The bellows is surrounded on its outer periphery by a pair of nested cylindrical members, so that only the vertical (vertical) component of the vibration load is applied to the bellows. On the other hand, only the laminated seismic isolation rubber is configured to suppress horizontal vibration. Hereinafter, this seismic isolation device is referred to as Conventional Technology 2.

[0005]

However, the prior art 1 described above uses a magnetic force to support a structure such as a bridge, so that an extremely large magnetic force is required, so that a high-output electromagnet is required. However, the device becomes large-scale. Furthermore, the response to power outages that occur frequently due to earthquakes is extremely inadequate, and is currently unrealistic.

[0006] Both of the above prior arts 1 and 2
The structure is fixed on a foundation by an elastic member (rubber, bellows or magnetic force of a magnet) having a constant spring constant. Therefore, in order to improve the seismic isolation effect, it is necessary to lower the spring constant of the seismic isolation device. However, in such a case, the seismic isolation device may oscillate due to wind loads or vibrations caused by transportation.

Further, as described above, one vibration system composed of a structure and a base fixed by an elastic member having a constant spring constant has a fixed natural frequency. Therefore, for example, depending on the characteristics of the generated seismic wave, the response acceleration of the vibration system increases, and furthermore, resonates, the vibration of the structure is amplified, and a stress exceeding an allowable value may be generated in the structure, and Damage or damage.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a seismic isolation device for a vibration component mainly in a vertical direction is provided with a substantially rigid support device to reduce a wind load in normal times and vibrations caused by transportation. In addition, by providing the supporting member with a separating member that is separated by a load equal to or more than a predetermined value, the supporting member is separated from the foundation and the structure by vibration and / or
Or, when a mutual reaction force of a predetermined value or more is applied from two structures, the rigid restraint of the structure is released and elastically restrained,
It is intended to prevent a reaction force of a predetermined value or more from being applied to the structure and to reduce the natural frequency of the entire structure including the seismic isolation device, thereby preventing the response acceleration from increasing. With such a configuration, the structure is intended to be effectively prevented from being damaged or damaged by an earthquake or the like.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The seismic isolation device of the present invention is provided with a substantially vertical relative position between a structure and a foundation interposed between the structure and a foundation and / or between two structures. A seismic isolation device for restraining and releasing a displacement and / or a relative vertical displacement of two structures, wherein the seismic isolation device is a substantially rigid body having a separating member separated by a load greater than a predetermined value. A supporting member, and a first elastic member that generates a reaction force while displacing itself according to the relative displacement between the structure and the foundation and / or the relative displacement between the two structures,
The support member and the first elastic member are configured to support the load of the upper structure in parallel.

[0010] Therefore, since the vertical component of the vibration applied to the structure is first received by the rigid support member, the vibration caused by the wind load or the transportation system in normal times has the ordinary seismic isolation device. This is prevented to the same extent as for structures that do not. On the other hand, when a large excitation force is applied due to an earthquake or the like, the separating member is separated when the load exceeds a preset value to the separating member, and the first elastic member is replaced with a structural member instead of the rigid supporting member. Is elastically supported, so that the load applied to the structure is reduced. Also,
The natural frequency of the structure including the seismic isolation device is reduced, and an increase in the response acceleration and resonance of the structure are prevented. As a result, damage to the structure can be prevented. Also, of the whole seismic isolation device,
Since the part to be broken (part of the separating member) is determined, maintenance becomes easy, and reuse of the seismic isolation device becomes easy.

The support member and the first elastic member constitute a pair of seismic isolation elements, and the plurality of seismic isolation elements are provided between a structure and a foundation and / or between two structures. In a seismic isolation device that is interposed in series and is configured so that the separating members in the support members of each seismic isolation element are separated by different loads, if the vibration increases, the minimum One separating member set to a separating load is first separated. As a result, the support member of the one of the plurality of seismic isolation elements does not work and the first elastic member of the seismic isolation element receives a load, so that the spring constant of the entire seismic isolation device decreases. Then, as the exciting force increases, the next separating member is separated, and as the exciting force increases, the spring constant decreases. In other words, the natural frequency of the vibration system including the seismic isolation device and the structure is reduced by separating the one separation member first, so that even if the structure resonates and the response acceleration of the structure is to be increased, The resonance is canceled by the change in the natural frequency. Therefore, if the maximum value among the set separation loads of the plurality of seismic isolation elements is set to the allowable load of the structure, the above-described action can be achieved, and the vibration corresponding to the allowable load or less can be obtained. However, damage can be suitably prevented. Also,
If the number of seismic isolation elements is increased, the natural frequency can be changed in many stages, so that it is possible to cope with an exciting force of any frequency characteristic.

The support member and the first elastic member constitute a pair of seismic isolation elements, and a second elastic member having a higher elastic modulus than the first elastic member in series with the seismic isolation element. In the seismic isolation device, the vibration load due to wind loads and transportation during normal times is suppressed, and the vibration energy is also transferred to the second elastic Since the members can be absorbed, the effect of suppressing the vibration of the structure due to the earthquake before the separation member is separated is exerted. For the further exciting force, a seismic isolation effect due to a change in the natural frequency is exerted by the action of the separating member as described above. The second elastic member also effectively acts on the horizontal component of the vibration, so that the seismic isolation effect is achieved.

[0013] Further, the support member and the first elastic member constitute a pair of seismic isolation elements, and have a higher elastic modulus than the first elastic member and are arranged in series with the seismic isolation element. In the seismic isolation device in which a plurality of second elastic members are provided, the plurality of second elastic members effectively act on the horizontal component of the vibration, and the support member and the first elastic member Can be reduced in the horizontal direction component of the vibration acting on. Further, such multiplexing is advantageous in that the effect of seismic isolation and vibration control can be improved in both vertical and horizontal directions.

In the above seismic isolation device, a pair of the support member and the first elastic member constitutes a seismic isolation element, and a sliding bearing is disposed in series with the seismic isolation element, thereby providing the above-described structure. In addition to being able to exert a seismic isolation effect on the vertical component of the vibration, the effect of the sliding bearing is also effective against horizontal vibrations, so that three-dimensional seismic isolation can be achieved.

In the above seismic isolation device, it is preferable that the first elastic member is formed of a bellows, since the natural frequency can be reduced by a simple and compact structure. It is desirable that the bellows be made of a high-strength metal such as stainless steel, and the bellows is not limited to one formed of a single metal plate, and a plurality of bellows concentrically stacked are used. You may.

Further, it is preferable to provide a working fluid supply device for pressurizing the inside of the bellows, since a supporting force corresponding to the weight and vibration load of the structure to be supported can be applied to the bellows. Further, the working fluid may be press-fitted between the bellows of a plurality of bellows which are concentrically stacked as described above.

If a pressure accumulating tank for the working fluid is provided in the working fluid supply device so that the volume of the pressure accumulating tank can be increased or decreased, the spring constant of the first elastic member is changed by changing the volume. It is preferable because it can be changed and adjusted. As a method of changing the volume, for example, a partition plate is provided inside a pressure accumulation tank, and the partition plate is moved up and down by a screw type or the like to change the volume on one side (operating side) of the partition plate. You may. Or
The gas phase volume may be changed by injecting an incompressible fluid such as water or oil into the accumulator tank.

If the second elastic member is formed of laminated seismic isolation rubber, a known material can be used, which is preferable in that design and manufacture can be easily performed.

It is preferable that the support member is disposed substantially in a ring shape and the first elastic member is disposed inside the support member, since the above-described operation can be achieved with a compact configuration.

It is to be noted that the term "annular" used in the claims includes not only a circular ring but also a polygonal ring such as a square tube, an elliptical ring, and the like. Further, “arranged in an annular shape” does not mean that the shape of the support member is a continuous annular shape. For example, a plurality of support members are intermittently and entirely annular. It is meant to include those arranged in.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The seismic isolation device of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

FIG. 1 is a schematic view of a bridge to which the seismic isolation device of the present invention is applied. FIG. 1A shows a state in which the seismic isolation device is interposed between a pier and a foundation structure, and FIG. ) Indicates a state in which the seismic isolation device is interposed between the bridge girder and the pier. FIG. 2 is a partially cutaway perspective view showing one embodiment of the seismic isolation device of the present invention, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIG. FIG. 5 is an enlarged view of a portion V of FIG. 4 showing an example of a separating member in the seismic isolation device of FIG. 4, and FIG. 6 is a V of FIG. 4 showing another example of the separating member in the seismic isolation device of FIG. FIG. 7 is a schematic sectional view showing an example of a working fluid supply device in the seismic isolation device of FIG.

The bridge B shown in FIG. 1A is provided with a seismic isolation device 1 between the pier P and the foundation F, and the bridge B shown in FIG. The seismic isolation device 1 is mounted between the two.

FIG. 2 shows the seismic isolation device 1 shown in FIG.
It is shown. This seismic isolation device 1 substantially corresponds to one seismic isolation element 22 in a seismic isolation device 21 according to another embodiment shown in FIG. Therefore, it is easy to understand if FIG. 4 is also referred to.

Above the seismic isolation device 1, a stainless steel bellows 2 is disposed between the upper surface plate 3 and the intermediate plate 4 by being tightly sealed inside and outside by welding or the like. In addition, in the lower part of the seismic isolation device 1, between the intermediate plate 4 and the lower surface plate 5, a groove
Thus, a laminated seismic isolation rubber 7 is provided. The upper plate 3 is connected to the lower end of the upper pier P by a groove / umbilicus connection portion 6, and the lower plate 5 is connected to the foundation F via a sliding bearing 8.
It is arranged above.

The sliding bearing 2 includes an upper shoe 8a fixed to the lower plate 5 and a lower shoe 8b fixed to the foundation F.
And a sliding surface 8c is formed between the upper shoe 8a and the lower shoe 8b. Both sliding surfaces 8c are formed of a known Teflon-finished surface, a smooth surface-finished stainless steel, or the like. The sliding surface may be formed on only one of the sliding surfaces.

The laminated seismic isolation rubber 7 is of a known type in which rubber plates 7a and metal plates 7b are alternately laminated. Since the laminated seismic isolation rubber 7 has a much larger spring constant than the magnetic seismic isolation device and the bellows in the prior art, the structure does not greatly shake in the vertical direction due to the wind load or transportation in normal times. .

As is clear from FIG. 3 as well,
On the outer peripheral side of the bellows 2, three arc-shaped support members 9 are fixedly disposed between the upper surface plate 3 and the intermediate plate 4 so as to surround the bellows 2 by bolts 10. The support member 9 is fitted so that the inner peripheral side arc portion 9a and the outer peripheral side arc portion 9b overlap inside and outside, and both are connected to each other by a separating member 11.
Therefore, a horizontal shear load is not applied to the bellows 2 and a vertical external force is not applied unless the separating member 11 is separated. In the present embodiment, one support member 9 is a piece of the inner circumferential side arc portion 9a.
And one piece of the outer peripheral side arc portion 9b, but as shown in FIG. 6, one piece may be made of two pieces and the other piece may be made of one piece that can penetrate between the two pieces. .

As is clear from FIG. 4, the overlapping dimension between the inner circular arc portion 9a and the outer circular arc portion 9b is set large. This is because not only can the two arc portions 9a and 9b be prevented from being disengaged by the relative movement of each other after the separation member 11 is separated in the event of an earthquake or the like, but also the edges of the two arc portions 9a and 9b can be prevented. Is in contact with the upper plate 3 and the intermediate plate 4 to prevent the bellows 2 from being excessively bent.

The present invention also includes a seismic isolation device that does not include the laminated seismic isolation rubber 7 but includes only the set of the bellows 2 and the support member 9. The structure is not largely shaken in the vertical direction by traffic or transportation, and the vibration can be attenuated by the separation of the separation member 11, thereby preventing the response acceleration of the structure from increasing.

Although the illustrated supporting member 9 is a plurality of members spaced apart in consideration of maintainability including the bellows 2, the supporting member 9 is not particularly limited to such a structure. It may be annular or the like.

FIG. 5 and FIG.
As shown in the figure, the pin comprises a shear pin 12c inserted into a bottomed hole 12d extending from the outer circular arc portion 9b to the inner circular arc portion 9a. The shear pin 12c has a cut-out portion 12b having a reduced diameter formed at a position corresponding to a boundary surface between the inner circumferential arc portion 9a and the outer circumferential arc portion 9b in the intermediate portion. After the shear pin 12c is inserted into the bottomed hole 12d, the plug 1 with a screw is inserted.
It is closed by 2a. Of course, the shear pin 12c and the plug 12a may be integrally formed. Further, a through hole may be formed instead of the bottomed hole 12d, and both open ends of the through hole may be closed by plugs 12a. In the case of the shear pins 12c of the same material, the separation load is basically set according to the cross-sectional area of the portion to be cut 12b. The inner peripheral side arc portion 9a and the outer peripheral side arc portion 9 depend on the vertical component of the vibration load.
When the shearing force is applied to the shear pin 12c, the shear pin 12c is cut.

With the above-described configuration, wind loads in normal times and vibrations caused by transportation are effectively prevented, and when a large vibration load due to an earthquake or the like exceeds the set load of all the separating members 11, the shear pin 12c is cut off. As a result, the bellows 2 receives a vibration load, which is attenuated by its elasticity.

As shown in FIGS. 3 and 4, an air supply passage 13 for supplying compressed air to the inside of the bellows 2 is formed in the intermediate plate 4. Then, the internal pressure is set according to the load to be supported by the bellows 2, for example, the weight of the structure, and thereby the initial bending of the bellows 2 is set.

As shown in FIG. 3, a high-pressure air tank (corresponding to an accumulator tank) 15 is provided as a means for supplying the compressed air. Compressed air is supplied to the high-pressure air tank 15 from a compressor (not shown) or the like. In addition, the internal volume of the high-pressure air tank 15 and the internal volume of the bellows 2 determine the compression allowance of the internal air, and thus serve as one factor in determining the spring constant of the bellows 2.
Therefore, the spring constant of the bellows 2 can be adjusted by changing the internal volume of the high-pressure air tank 15. As means for changing the internal volume of the high-pressure air tank 15, as shown in FIG.
A movable partition plate 17 that can be moved up and down by 6 is provided.
By moving the movable partition plate 17 up and down, the volume of the space above the movable partition plate 17 which is the effective volume of the high-pressure air tank 15 is changed. The screw 16 is subjected to sealing such as applying a sealing agent to prevent leakage of high-pressure air.

As another means for changing the internal volume, for example, an arbitrary amount of an incompressible fluid such as water or oil is injected into the high-pressure air tank 15 to change the volume of the gas phase. It is also effective to adjust the spring constant of the bellows 2 by the volume. By doing so, the spring constant can be adjusted very easily.

The communication from the high-pressure air tank 15 to the inside of the bellows 2 is made by a pipe 18 having a flexible helical portion 18a formed on the way as a measure against vibration.

The seismic isolation device 21 shown in FIG. 4 is substantially the seismic isolation device 1 of FIG. Therefore, common components will be described with common reference numerals. In this seismic isolation device 21, the number of sets of bellows 2 and support members 9 (hereinafter referred to as seismic isolation elements 22) is one more than the number of laminated seismic isolation rubbers 7. It is not limited to. The number is not limited to four (three), but may be less than four (three) or more than four (three). In the present embodiment, the point that a plurality of seismic isolation elements 22 are provided has the following meaning.

An advantage of the seismic isolation device 21 is that the set breaking forces of the separation members 11 in the respective seismic isolation elements 22 can be set to different values as needed. That is, in this embodiment, the set breaking force of all the separating members 11 in one seismic isolation element 22 is set as a different value for each seismic isolation element 22. For example, the set breaking force of the first seismic isolation element 221 as the uppermost seismic isolation element in the figure is minimized, and the second seismic isolation element 222, the third seismic isolation element 223,
The size of the fourth seismic isolation element 224 is increased. Then, the separation member 11 having a small set breaking force is separated according to the strength of the generated earthquake, and the spring constant of the seismic isolation device 21 and, consequently, the natural frequency of the vibration system can be changed.
An increase in the response acceleration of the structure can be effectively prevented.

In the present invention, it is not necessary to arrange the seismic isolation elements in the order of the set breaking force. On the other hand, the spring constants of the bellows 2 of all the seismic isolation elements need not necessarily be the same.

Example A seismic isolation device 22 shown in FIG. 4 was manufactured as follows. That is, the bellows are formed from eight stainless steel plates each having a thickness of 2 mm, the pressure receiving diameter of each of the top plate and the intermediate plate is 80 cm (pressure receiving area is 5.03 × 10 ³ cm ² ), and each bellows has a bellows mountain. The number is three peaks, the peak height is 10 cm, the length in the bellows axial direction is 20 cm, and the internal air pressure is 60 kgf.
/ Cm ² . Further, the volume of the high-pressure air tank is set to 9.8.
It was 2 × 10 ⁴ cm ³ .

From the above, the spring constant of the four bellows itself and the internal high-pressure air is 7.45 × 10 ³ kgf / c.
m. The load that can be supported is 3.02 × 10 ² t.
onf.

The total height of the laminated seismic isolation rubber is 10
cm, the outer diameter is 88 cm, and the spring constant is 5 × 10 ⁵
kgf / cm or more.

As described above, the spring constant of the three laminated seismic isolation rubbers is 1.7 × 10 ⁵ kgf / cm or more.

Assuming that the inner diameter of the supporting member is 110 cm and the thickness of the arc portion is 10 cm, the spring constant is 5.65 × 1.
0 ⁷ kgf / cm, and the larger negligibly the spring constant of the bellows. Further, the load can be sufficiently supported.

When the seismic isolation device shown in FIG. 4 is disposed on each of the four piers of the portal bridge, a total of 1.2 × 10 ³ t
Onf load can be supported. In addition, the natural frequency before the separation member of the support member is separated is 3.7 Hz or more, and the natural frequency after all the separation members of all seismic isolation elements are separated is 0.78 Hz. The frequency of many seismic waves is 1
In view of the fact that the frequency is higher than Hz, it is understood that a sufficient seismic isolation effect can be exhibited. Of course, the natural frequency is gradually reduced by sequentially separating all the separating members of the four seismic isolation elements, and the seismic isolation effect is exerted on various seismic waves.

In the embodiment described above, the first elastic member is constituted by the bellows. However, the present invention is not particularly limited to the bellows, and a coil spring or the like may be used instead of the bellows.

[0048]

According to the present invention, the rigid support member first receives the vertical component of the vibration applied to the structure.
Under normal circumstances, vibrations caused by wind loads and transportation are prevented to the same extent as structures that do not have ordinary seismic isolation devices. On the other hand, when a large excitation force is applied due to an earthquake or the like, the separating member is separated when the load exceeds a preset value to the separating member, and the first elastic member is replaced with a structural member instead of the rigid supporting member. Is elastically supported, so that the load applied to the structure is reduced. In addition, the natural frequency of the structure including the seismic isolation device is reduced, and an increase in the response acceleration and resonance of the structure are prevented. As a result, damage to the structure can be prevented. In addition, since a part to be broken (a part of the separating member) in the entire seismic isolation device is determined, maintenance is facilitated, and reuse of the seismic isolation device is also facilitated.

Further, by arranging the seismic isolation devices in a plurality of stages in series, the separating member is first separated according to the vibration load, so that each time the spring constant of the seismic isolation device decreases, And the natural frequency of the vibration system composed of the structure decreases. Therefore, an increase in the response acceleration of the structure to the excitation force having any frequency characteristic is prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view of a bridge to which a seismic isolation device of the present invention is applied, (a) shows a state where the seismic isolation device is interposed between a pier and a foundation, and (b) shows This shows a state in which the seismic isolation device is interposed between the bridge girder and the pier.

FIG. 2 is a partially cutaway perspective view showing one embodiment of the seismic isolation device of the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a sectional view showing another embodiment of the seismic isolation device of the present invention.

5 is an enlarged view of a part V of FIG. 4 showing an example of a separating member in the seismic isolation device of FIG. 4;

6 is an enlarged view showing another example of the separating member in the seismic isolation device of FIG. 4 and corresponding to a portion V in FIG. 4;

FIG. 7 is a schematic sectional view showing an example of a working fluid supply device in the seismic isolation device of FIG.

[Explanation of symbols]

 1, 21 ... seismic isolation device 2 ... bellows 3 ... top plate 4 ... intermediate plate 5 ... bottom plate 7 ... laminated seismic isolation rubber 8 ... sliding bearing 9 ... Supporting member 11: separating member 12c shear pin 15: high-pressure air tank

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Kaneda 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Inside Akashi Plant (72) Inventor Fujiichi Sakai 2-1-1, Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries, Ltd.Tokyo Design Office (72) Inventor Kazushi Ogawa 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd.

Claims (10)

[Claims] 1. A substantially vertical relative displacement between the structure and the foundation and / or the substance of the two structures, interposed between the structure and the foundation and / or between the two structures. A seismic isolation device for vertically restraining and releasing relative displacement in a vertical direction, comprising a substantially rigid support member provided with a separating member separated by a load of a predetermined value or more, and a structure and a foundation. A first elastic member that generates a reaction force while displacing itself in accordance with the relative displacement and / or the relative displacement of the two structures, wherein the supporting member and the first elastic member A seismic isolation device configured to support loads in parallel. 2. The support member and the first elastic member form a pair as a seismic isolation element, and a plurality of the seismic isolation elements are provided between a structure and a foundation and / or between two structures. 2. The seismic isolation device according to claim 1, wherein the seismic isolation devices are arranged in series with each other, and the separation members of the support members of the respective seismic isolation elements are configured to be separated by different loads. 3. The seismic isolation element includes a pair of the support member and the first elastic member, and in series with the seismic isolation element,
The seismic isolation device according to claim 1 or 2, further comprising a second elastic member having a higher elastic coefficient than the first elastic member. 4. A pair of the support member and the first elastic member constitute a seismic isolation element, and have a higher elastic modulus than the first elastic member and are arranged in series with the seismic isolation element. The seismic isolation device according to any one of claims 1 to 3, wherein a plurality of second elastic members are provided. 5. The seismic isolation element comprising a pair of the support member and the first elastic member, wherein a sliding bearing is disposed in series with the seismic isolation element. The seismic isolation device according to any one of the above items. 6. The seismic isolation device according to claim 1, wherein the first elastic member is formed of a bellows. 7. The seismic isolation device according to claim 6, further comprising a working fluid supply device for pressurizing the inside of the bellows. 8. The seismic isolation device according to claim 7, wherein the working fluid supply device has a pressure accumulating tank for the working fluid, and the pressure accumulating tank is configured to be able to increase or decrease its volume. 9. The seismic isolation device according to claim 3, wherein the second elastic member is formed of a laminated seismic isolation rubber. 10. The support member according to claim 1, wherein the support member is disposed substantially in a ring shape, and the first elastic member is disposed inside the support member. Seismic isolation device described in.