JP2021165568A - Seismic isolator - Google Patents

Abstract

To provide a seismic isolator capable of improving seismic isolation performance.SOLUTION: A seismic isolator 1 comprises a laminated structure 3 having hard material layers 4 and soft material layers 5 alternately laminated in a vertical direction. A cavity part 8 is formed in a soft material part composed of each soft material layer, and the hard material layer is located in the cavity part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a seismic isolation device.

A conventional seismic isolation device is generally formed by alternately laminating hard material layers and soft material layers in the vertical direction (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-170233

However, in the conventional seismic isolation device, there is room for improvement in terms of seismic isolation performance.

An object of the present invention is to provide a seismic isolation device capable of improving seismic isolation performance.

The seismic isolation device of the present invention
A seismic isolation device having a laminated structure having hard material layers and soft material layers alternately laminated in the vertical direction.
A cavity is formed in the soft material portion composed of each of the soft material layers.
The hard material layer is located in the cavity.
According to the seismic isolation device of the present invention, the seismic isolation performance can be improved.

In the seismic isolation device of the present invention
It is preferable that the cavity portion is located on the central axis of the laminated structure.
As a result, isotropic property can be realized with respect to the seismic isolation performance of the seismic isolation device.

In the seismic isolation device of the present invention
It is preferable that the center of the cavity in the axial direction is located on the central axis of the laminated structure.
As a result, isotropic property can be realized with respect to the seismic isolation performance of the seismic isolation device.

In the seismic isolation device of the present invention
It is preferable that the cavity portion exists over the entire length in the axial direction in the laminated structure, whereby the seismic isolation performance of the seismic isolation device can be improved.

In the seismic isolation device of the present invention
It is preferable that each of the hard material layers extends over substantially the entire axial direction of the laminated structure.
As a result, the buckling resistance performance of the seismic isolation device can be improved.

In the seismic isolation device of the present invention
In the axial cross section of the laminated structure, the total axial length of the axial region where the cavity is present in the laminated structure is 0.10 to 0, which is the outer diameter of the laminated structure. 60 times is preferable.
As a result, the seismic isolation performance of the seismic isolation device can be further improved.

According to the present invention, it is possible to provide a seismic isolation device capable of improving seismic isolation performance.

It is an axial sectional view which shows the seismic isolation device which concerns on 1st Embodiment of this invention in the state which the horizontal direction deformation has not occurred. FIG. 5 is an axial sectional view showing a seismic isolation device according to a second embodiment of the present invention in a state where horizontal deformation does not occur. FIG. 5 is an axial sectional view showing a seismic isolation device according to a third embodiment of the present invention in a state where horizontal deformation does not occur.

The seismic isolation device of the present invention has an upper structure and a lower part of a structure in order to suppress the shaking of an earthquake from being transmitted to a structure (for example, a building such as a building, a condominium, a detached house, a warehouse, and a bridge). It is suitable when placed between the structure.
Hereinafter, embodiments of the seismic isolation device according to the present invention will be illustrated and described with reference to the drawings. The components common to each figure are designated by the same reference numerals.

FIG. 1 is a drawing for explaining the seismic isolation device 1 according to the first embodiment of the present invention. FIG. 2 is a drawing for explaining the seismic isolation device 1 according to the second embodiment of the present invention. FIG. 3 is a drawing for explaining the seismic isolation device 1 according to the third embodiment of the present invention. 1 to 3 show the seismic isolation device 1 in a state where no horizontal deformation has occurred.
Hereinafter, for convenience of explanation, the seismic isolation device 1 of each embodiment of FIGS. 1 to 3 will be described together.
As shown in FIG. 1, the seismic isolation device 1 includes a pair of upper and lower flange plates 21 and 22 (hereinafter, also referred to as “upper flange plate 21” and “lower flange plate 22”, respectively) and a laminated structure 3. , Is equipped.

In the present specification, the “central axis O” of the seismic isolation device 1 (hereinafter, also simply referred to as “central axis O”) is the central axis of the laminated structure 3. The central axis O of the seismic isolation device 1 is oriented so as to extend in the vertical direction. In the present specification, the "axis direction" of the seismic isolation device 1 is a direction parallel to the central axis O of the seismic isolation device 1. The "inside in the axial direction" of the seismic isolation device 1 refers to the side close to the center in the axial direction of the laminated structure 3, and the "outside in the axial direction" of the seismic isolation device 1 refers to the center in the axial direction of the laminated structure 3. It points to the side far from (the side closer to the flange plates 21 and 22). Further, the "vertical direction" of the seismic isolation device 1 is a direction perpendicular to the axial direction of the seismic isolation device 1. Further, the "inner peripheral side", "outer peripheral side", "diameter direction", and "circumferential direction" of the seismic isolation device 1 refer to the "inner peripheral side" when the central axis O of the seismic isolation device 1 is centered. Refers to "outer circumference side", "diameter direction", and "circumferential direction", respectively. Further, "upper" and "lower" refer to "upper" and "lower" in the vertical direction, respectively.

The upper flange plate 21 has an upper structure (building body, etc.) of a structure (for example, a building, a condominium, a detached house, a warehouse, etc., and a bridge, etc.) mounted on the upper flange plate 21. It is configured to be connected to the superstructure. The lower flange plate 22 is arranged below the upper flange plate 21 and is configured to be connected to a lower structure (foundation or the like) of the structure. The upper flange plate 21 and the lower flange plate 22 are preferably made of metal, and more preferably made of steel. The upper flange plate 21 and the lower flange plate 22 may have an arbitrary outer edge shape such as a circular shape or a polygonal shape (square shape or the like) in the cross section in the axial direction.

The laminated structure 3 is arranged between the upper flange plate 21 and the lower flange plate 22. The laminated structure 3 has a plurality of hard material layers 4, a plurality of soft material layers 5, and a coating layer 6. The hard material layer 4 and the soft material layer 5 are alternately laminated in the vertical direction. The hard material layer 4 and the soft material layer 5 are arranged coaxially, that is, the central axis of each hard material layer 4 and each soft material layer 5 is the central axis of the seismic isolation device 1. It is located on O. Soft material layers 5 are arranged at both upper and lower ends of the laminated structure 3. The pair of soft material layers 5 arranged at the upper and lower ends of the laminated structure 3 are fixed to the upper flange plate 21 and the lower flange plate 22, respectively.

The hard material layer 4 is made of a hard material. As the hard material constituting the hard material layer 4, metal is preferable, and steel is more preferable. As in each example of FIGS. 1 to 3, it is preferable that the axial distance between the hard material layers 4 is uniform (constant), but the axial distance between the hard material layers 4 is not uniform. It may be uniform (non-constant). Here, the "axial distance between the hard material layers 4" refers to the axial distance between the axial centers of the pair of hard material layers 4 adjacent to each other. Further, as in each example of FIGS. 1 to 3, it is preferable that the thicknesses of the hard material layers 4 are the same as each other, but the thicknesses of the hard material layers 4 may be different from each other. good.
The soft material layer 5 is composed of a soft material having a lower hardness (softer) than the hard material layer 4. As the soft material constituting the soft material layer 5, an elastic body is preferable, and rubber is more preferable. As the rubber that can form the soft material layer 5, natural rubber or synthetic rubber (high damping rubber or the like) is suitable. As in each example of FIGS. 1 to 3, it is preferable that the thicknesses of the soft material layers 5 are the same as each other, but the thicknesses of the soft material layers 5 may be different from each other.

The coating layer 6 covers the outer peripheral surfaces of the hard material layer 4 and the soft material layer 5. As the material constituting the coating layer 6, an elastic body is preferable, and rubber is more preferable. The material constituting the coating layer 6 may be the same as the soft material constituting the soft material layer 5, or may be different from the soft material constituting the soft material layer 5.
The coating layer 6 is integrally formed with the soft material layer 5.
In each of the examples of FIGS. 1 to 3, the coating layer 6 covers the entire outer peripheral surface of the hard material layer 4 and the soft material layer 5, and thus the entire outer peripheral surface of the laminated structure 3. Consists of. However, the coating layer 6 may cover only a part of the outer peripheral side surface of the hard material layer 4 and the soft material layer 5, and thus constitutes only a part of the outer peripheral side surface of the laminated structure 3. You may be. Further, the coating layer 6 may not be provided, and in that case, the outer peripheral surface of the laminated structure 3 is composed of only the outer peripheral surface of the hard material layer 4 and the soft material layer 5.

In the present embodiment, the laminated structure 3, the hard material layer 4, the soft material layer 5, and the coating layer 6 each have an arbitrary outer edge shape such as a circular shape or a polygonal shape (square or the like) in the axial cross section. You can do it.
In the present specification, the "outer diameters" of the laminated structure 3, the hard material layer 4, the soft material layer 5, and the coating layer 6 each have a non-circular outer edge shape in the axial cross section. If so, it refers to the outer diameter of these circumscribed circles in the axial cross section.
It is preferable that the outer surface of the laminated structure 3 is formed rotationally symmetrically around the central axis O of the laminated structure 3.

As shown in FIGS. 1 to 3, in each embodiment of the present invention, one or more cavities 8 are formed in the soft material portion 7 composed of each soft material layer 5. A plurality of soft material layers 5 included in the laminated structure 3 constitute one soft material portion 7. The cavity 8 is filled with air.
A hard material layer 4 is located in the cavity 8 (specifically, the hard material layer 4 extends in the axial direction in the cavity 8). In other words, the hard material layer 4 is located not only between the soft material layers 5 adjacent to each other in the axial direction, but also in the cavity 8.

Hereinafter, the operation and effect of the seismic isolation device 1 according to each embodiment of the present invention will be described.
First, in the seismic isolation device 1 of each embodiment of the present invention, as described above, a hollow portion 8 is formed in the soft material portion 7. Since the cavity 8 is formed in the soft material portion 7, the laminated structure 3 can be softened as compared with the case where the cavity 8 is not formed in the soft material portion 7, so that the structure can be made. (In other words, the structure will sway more slowly), and the seismic isolation performance of the seismic isolation device 1 can be improved.
Further, in the seismic isolation device 1 of each embodiment of the present invention, as described above, the hard material layer 4 is located in the cavity 8. Since the hard material layer 4 is located in the cavity 8, the laminated structure is formed when the seismic isolation device 1 is horizontally deformed, as compared with the case where the hard material layer 4 is not located in the cavity 8. Since the body 3 is supported more firmly in the axial direction, the seismic isolation device 1 is less likely to buckle (in other words, the buckling resistance performance of the seismic isolation device 1 can be improved).

In each of the examples described herein, the cavity 8 may be formed at any position in the soft material section 7.
For example, in each of the examples described in the present specification, the cavity 8 may be located on the central axis O of the laminated structure 3, as in each of the examples of FIGS. 1 and 2. As a result, isotropic property can be realized with respect to the seismic isolation performance of the seismic isolation device 1.
In this case, as in each example of FIGS. 1 and 2, it is more preferable that the axial center C8 of the cavity 8 is located on the central axis O of the laminated structure 3. As a result, further isotropic property can be realized with respect to the seismic isolation performance of the seismic isolation device 1.
However, the cavity 8 is located on the central axis O of the laminated structure 3, and the center C8 in the longitudinal direction of the cavity 8 is located radially outward from the central axis O of the laminated structure 3. It may be located. In this case as well, a certain degree of isotropic property can be realized with respect to the seismic isolation performance of the seismic isolation device 1.
Further, from the viewpoint of realizing isotropic property in terms of seismic isolation performance, the cavity portion 8 is formed rotationally symmetrically around the central axis O of the laminated structure 3 as in each example of FIGS. 1 to 2. It is suitable. However, the cavity 8 does not have to be formed rotationally symmetrically around the central axis O of the laminated structure 3.

Alternatively, in each of the examples described in the present specification, the cavity 8 may be located at a position that does not overlap with the central axis O of the laminated structure 3, as in the example of FIG.
In this case, for example, the plurality of cavities 8 are arranged at positions that do not overlap with the central axis O of the laminated structure 3, and from each other along the circumferential direction around the central axis O of the laminated structure 3. They may be arranged at intervals. Alternatively, one cavity 8 may be arranged at a position that does not overlap with the central axis O of the laminated structure 3 and may be arranged in an annular shape around the central axis of the laminated structure 3. In these cases as well, isotropic property can be realized with respect to the seismic isolation performance of the seismic isolation device 1.

In each of the examples described herein, it is preferable that the cavity 8 exists over the entire length of the laminated structure 3 in the axial direction, as in the example of FIG. As a result, the laminated structure 3 can be made softer, so that the seismic isolation performance of the seismic isolation device 1 can be improved.
However, the cavity 8 may exist only in a part of the laminated structure 3 in the axial direction as in each of the examples of FIGS. 2 and 3. For example, the cavity 8 may exist only over a part of the upper side of the laminated structure 3 in the axial direction as in the example of FIG. 2, or only a part of the lower side of the laminated structure 3 in the axial direction. It may be present over, or it may be present only over the central portion in the axial direction of the laminated structure 3 as in the example of FIG. When the cavity 8 exists only in a part of the laminated structure 3 in the axial direction, the seismic isolation device is compared with the case where the cavity 8 exists over the entire length of the laminated structure 3 in the axial direction. Since the laminated structure 3 is more firmly supported in the axial direction during the horizontal deformation of 1, the buckling resistance performance of the seismic isolation device 1 can be improved. In this case, the axial length of the cavity 8 is preferably 0.30 times or more, and more preferably 0.50 times or more, the total length of the laminated structure 3 in the axial direction.

In each of the examples described herein, as in the examples of FIGS. 1 to 3, all the hard material layers 4 of the hard material layers 4 located at the axial positions corresponding to the cavities 8 are Each is not only located between the soft material layers 5 adjacent to each other in the axial direction, but also located in the cavity 8 (that is, extends in the cavity 8 in the axial direction). It is suitable. Thereby, the buckling resistance performance of the seismic isolation device 1 can be improved.
However, only a part of the hard material layers 4 among the hard material layers 4 located at the axial positions corresponding to the cavities 8 are located in the cavities 8 (that is, the axes in the cavities 8). The remaining hard material layer 4 of each hard material layer 4 located at the axial position corresponding to the cavity 8 is not located in the cavity 8. You may. Even with such a configuration, as compared with the case where all the hard material layers 4 among the hard material layers 4 located at the axial positions corresponding to the cavities 8 are not located in the cavities 8, respectively. Therefore, the buckling resistance performance of the seismic isolation device 1 can be improved.

In each example described in the present specification, as in the examples of FIGS. 1 to 3, a part or all of each hard material layer 4 located at an axial position corresponding to the cavity 8 (in each figure). In the example, each of the hard material layers 4 (all) extends in the axial direction in the cavity 8 over the entire axial direction of the cavity 8, and is in the axial direction more than the cavity 8. It is preferable that it extends in the direction perpendicular to the axis to the outer position. Thereby, the buckling resistance performance of the seismic isolation device 1 can be further improved.
It should be noted that only a part of the hard material layers 4 among the hard material layers 4 located at the axial positions corresponding to the cavities 8 have the inside of the cavities 8 over the entire axial direction of the cavities 8, respectively. When extending in the axial direction, the remaining hard material layers 4 of the respective hard material layers 4 located at the axial positions corresponding to the cavities 8 are not located in the cavities 8, respectively. Alternatively, the inside of the cavity 8 may extend in the axial direction over only a part of the cavity 8 in the axial direction. Even with such a configuration, as compared with the case where all the hard material layers 4 among the hard material layers 4 located at the axial positions corresponding to the cavities 8 are not located in the cavities 8, respectively. Therefore, the buckling resistance performance of the seismic isolation device 1 can be improved.

In each of the examples described herein, it is preferable that each hard material layer 4 extends over substantially the entire axial direction of the laminated structure 3, as in the examples of FIGS. 1 to 3. be. Thereby, the buckling resistance performance of the seismic isolation device 1 can be improved.
From the same viewpoint, it is preferable that each hard material layer 4 extends in the entire axial direction of the portion of the laminated structure 3 excluding the coating layer 6 as in the examples of FIGS. 1 to 3. Is.
However, each hard material layer 4 may extend over only a part of the laminated structure 3 in the axial direction. Further, each hard material layer 4 may extend only over a part of the laminated structure 3 in the axial direction except for the coating layer 6.

In each example described in the present specification, in the axial cross section of the laminated structure 3, the axial length LA of the axially perpendicular regions A, A1, and A2 in which the cavity 8 of the laminated structure 3 exists. The total of LA1 and LA2 is preferably 0.10 to 0.60 times the outer diameter of the laminated structure 3, and more preferably 0.20 to 0.30 times. As a result, the seismic isolation performance can be further improved.
In the axial cross section of the laminated structure 3, the total of the axial lengths LA, LA1, and LA2 of the axial regions A, A1, and A2 in which the cavity 8 exists in the laminated structure 3 is, for example, As in the example of FIG. 3, when a plurality of cavities 8 separated from each other in the axial direction are visible in the axial cross section of the laminated structure 3, it is the total length of each cavity 8 in the axial direction. That is, in the case of the example of FIG. 3, in the axial cross section of the laminated structure 3, the sum of the axial lengths LA1 and LA2 of the axially perpendicular regions A1 and A2 in which the cavity 8 exists in the laminated structure 3 Is the sum of the length LA1 and the length LA2 (LA1 + LA2).

In each example described in the present specification, in the axial cross section of the laminated structure 3, the axial length LA of the axially perpendicular regions A, A1, and A2 in which the cavity 8 of the laminated structure 3 exists. LA1 and LA3 are preferably 0.10 to 0.40 times the outer diameter of the laminated structure 3, and more preferably 0.25 to 0.30 times the outer diameter of the laminated structure 3, respectively. As a result, the seismic isolation performance can be further improved.

In each of the examples shown in FIGS. 1 to 3, the cavity 8 has a cylindrical shape in which the central axis is parallel to the axis direction. However, the cavity 8 may have an arbitrary shape, and may be, for example, a quadrangular prism shape, a spherical shape, or the like.

The seismic isolation device of the present invention has an upper structure and a lower part of a structure in order to suppress the shaking of an earthquake from being transmitted to a structure (for example, a building such as a building, a condominium, a detached house, a warehouse, and a bridge). It is suitable when placed between the structure.

1: Seismic isolation device,
21: Upper flange plate (flange plate), 22: Lower flange plate (flange plate),
3: Laminated structure,
4: Hard material layer,
5: Soft material layer,
6: Coating layer,
7: Soft material part,
8: Cavity, C8: Center of the cavity in the axial direction,
O: Central axis

Claims (6)

A seismic isolation device having a laminated structure having hard material layers and soft material layers alternately laminated in the vertical direction.
A cavity is formed in the soft material portion composed of each of the soft material layers.
A seismic isolation device in which the hard material layer is located in the cavity. The seismic isolation device according to claim 1, wherein the cavity is located on the central axis of the laminated structure. The seismic isolation device according to claim 1 or 2, wherein the center of the cavity in the axial direction is located on the central axis of the laminated structure. The seismic isolation device according to any one of claims 1 to 3, wherein the cavity portion exists over the entire length in the axial direction in the laminated structure. The seismic isolation device according to any one of claims 1 to 4, wherein each of the hard material layers extends over substantially the entire axial direction of the laminated structure. In the axial cross section of the laminated structure, the total axial length of the axial region where the cavity is present in the laminated structure is 0.10 to 0. Of the outer diameter of the laminated structure. The seismic isolation device according to any one of claims 1 to 5, which is 60 times larger.

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