JP2021165569A - Seismic isolator - Google Patents

Abstract

To provide a seismic isolator which can improve buckling resistance.SOLUTION: In a seismic isolator having a columnar block body extending in a vertical direction at a center axial line, a cross section area A71 of an entire length block portion 71 in the axial vertical direction continuously extending in the vertical direction over an entire length of the block body in the vertical direction in a state in which shear strain is 0% is set smaller than a cross section area A81 of a comparison entire length block portion 81 in the axial vertical direction continuously extending in the vertical direction over an entire length of a comparison block body out of the comparison block body in the vertical direction in a state in which the shear strain of the comparison block body is 0%. When setting a secondary shape coefficient of the comparison block body as S2, an area of an overlapping region in which an upper face and a lower face of the block body overlap each other in the vertical direction in a state in which the shear strain of the block body is S2×100% is larger than an area of a comparison overlapping region in which an upper face and a lower face of the comparison block body overlap each other in the vertical direction in a state in which the shear strain of the comparison block body is S2×100%.SELECTED DRAWING: Figure 2

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 a risk of buckling when the seismic isolation device is deformed in the horizontal direction.

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

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 virtual block body formed by vertically laminating the soft material layers of the laminated structure is referred to as a main block body.
A columnar block body having the same soft material as the soft material constituting the soft material layer, having the same horizontal rigidity and vertical length as the main block body, and having a central axis extending in the vertical direction. When calling it a comparison block
When the shear strain of the main block body is 0%, the axial cross-sectional area A71 of the full length block portion of the main block body that continuously extends in the vertical direction over the total length of the main block body in the vertical direction is A81. A81 Smaller than
When the secondary shape coefficient of the comparison block body is referred to as S2,
When the shear strain of the block body is S2 × 100%, the area A72 of the overlapping region where the upper surface and the lower surface of the block body overlap in the vertical direction is S2 × 100% of the shear strain of the comparison block body. In this state, the upper surface and the lower surface of the comparative block body are larger than the area A82 of the comparative overlapping region where the upper surface and the lower surface of the comparative block body overlap in the vertical direction.
According to the seismic isolation device of the present invention, the buckling resistance performance can be improved.

In the seismic isolation device of the present invention
The area A72 of the overlapping region when the shear strain of the block body is S2 × 100% is the axial cross-sectional area A81 of the comparative total length block portion when the shear strain of the comparison block body is 0%. It is preferable that it is 0.05 times or more.
Thereby, the buckling resistance performance can be further improved.

In the seismic isolation device of the present invention
The area A72 of the overlapping region when the shear strain of the block body is S2 × 100% is the axial cross-sectional area A81 of the comparative total length block portion when the shear strain of the comparison block body is 0%. It is preferable that it is 0.09 times or more.
Thereby, the buckling resistance performance can be further improved.

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

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. 2A is an axial cross-sectional view showing the block body corresponding to the laminated structure of FIG. 1 in a state where the shear strain is 0%, and FIG. 2B is FIG. 2A. It is an axial sectional view which shows the comparative block body corresponding to this block body in the state of the shear strain of 0%. FIG. 3A is an axial cross-sectional view showing the block body of FIG. 2A in a state where the shear strain is S2 × 100%, and FIG. 3B is FIG. 2B. FIG. 5 is an axial cross-sectional view showing a comparative block body in a state where the shear strain is S2 × 100%. FIG. 5 is an axial cross-sectional view showing the block body corresponding to the seismic isolation device according to the second embodiment of the present invention in a state where the shear strain is 0%. It is an axial sectional view which shows this block body corresponding to the seismic isolation device which concerns on 3rd Embodiment of this invention in the state of the shear strain of 0%. It is a top view which shows the flange plate which can be applied to the seismic isolation device which concerns on any Embodiment of this invention.

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.

1 to 3 are drawings for explaining the seismic isolation device 1 according to the first embodiment of the present invention. FIG. 1 is an axial cross-sectional view showing the seismic isolation device 1 according to the first embodiment in a state where no horizontal deformation has occurred.
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 substantially polygonal shape (a substantially quadrangle, a substantially octagonal shape, etc.) in a cross section in the axial direction. For example, the upper flange plate 21 and the lower flange plate 22 have a substantially octagonal outer edge shape as shown in FIG. 6, for example, and a bay having a linear side portion 2a and a convex curve toward the outer peripheral side. The curved side portions 2b may be alternately arranged in the circumferential direction. It may also be circular or square.

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 the example of FIG. 1, it is preferable that the axial spacing between the hard material layers 4 is uniform (constant), but the axial spacing between the hard material layers 4 is non-uniform (non-constant). ) May be. 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 4, 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 the example of FIG. 1, 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 the example of FIG. 1, the coating layer 6 covers the entire outer peripheral surface of the hard material layer 4 and the soft material layer 5, and thus constitutes the entire outer peripheral surface of the laminated structure 3. There is. 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 hard material layer 4, the soft material layer 5, and the coating layer 6 may each have an arbitrary outer edge shape such as a circular shape or a substantially polygonal shape (substantially quadrangular shape) in the axial cross section. good.

In addition, in this specification, each "outside" of a certain element (for example, a laminated structure 3, a hard material layer 4, a soft material layer 5, a coating layer 6, the present block body 7 described later, and a comparative block body 8 described later). "Diameter" refers to the outer diameter of the circumscribed circle of the element in the axial cross section when the element has a non-circular outer edge shape in the axial cross section.

The laminated structure 3 of the seismic isolation device 1 of each embodiment of the present invention is defined by using the present block body 7 and the comparative block body 8 described below.

FIG. 2A is an axial cross-sectional view showing the block body 7 corresponding to the laminated structure 3 of the seismic isolation device 1 of the embodiment of FIG. 1 in a state where the shear strain is 0%. FIG. 2B is an axial cross-sectional view showing the comparative block body 8 corresponding to the main block body 7 of FIG. 2A in a state where the shear strain is 0%. 2 (a) and 2 (b) are cross-sectional views, but hatching is omitted for the sake of clarity. In FIG. 2A, for convenience, the central axis O of the laminated structure 3 is shown together with the block body 7. The central axis of the block body 7 coincides with the central axis O of the laminated structure 3.
In each embodiment of the present invention, the "block body 7" corresponding to the laminated structure 3 of the seismic isolation device 1 is integrated by vertically laminating the soft material layers 5 of the laminated structure 3 with each other. It is a virtual block body. Further, the "comparative block body 8" corresponding to the block body 7 is made of the same soft material as the soft material constituting the soft material layer 5 of the laminated structure 3, and has horizontal rigidity and a vertical length T8. Is a columnar block body in which the central axis O'extends in the vertical direction, which is the same as the horizontal rigidity and the vertical length T7 of the main block body 7, respectively. A separate main block body 7 and a comparative block body 8 are defined for each embodiment of the seismic isolation device 1.
The "state in which the shear strain is 0%" corresponds to a state in which no horizontal deformation has occurred. The comparative block body 8 is a seismic isolation device provided with a columnar laminated structure that is generally seen in the past, and is a virtual block body formed by laminating and integrating the soft material layers of the laminated structure. , You can see it. The block body 7 and the comparison block body 8 are made of the same soft material as each other. The vertical length T7 of the block body 7 is the same as the total thickness of the soft material layers 5 of the laminated structure 3 (that is, the total thickness of each soft material layer 5 of the laminated structure 3). The vertical length T8 of the comparative block body 8 is the total thickness of the soft material layer of the laminated structure (that is, the laminated structure) in the seismic isolation device provided with the columnar laminated structure as generally seen in the past. It can be seen as the same as the total thickness of each soft material layer of the structure). The cylindrical central axis O'formed by the comparative block body 8 extends in the vertical direction.
In each embodiment of the present invention, the laminated structure 3 is the shaft of the full length block portion 71 of the block body 7 in a state where the shear strain of the block body 7 is 0%, as in the embodiment shown in FIG. 2, for example. The longitudinal cross-sectional area A71 is smaller than the axial longitudinal cross-sectional area A81 of the comparative total length block portion 81 of the comparative block body 8 in the state where the shear strain of the comparative block body 8 is 0% (hereinafter, this configuration is referred to as “configuration A”. Also called.).
The “main length block portion 71” is a portion of the main block body 7 that continuously extends in the vertical direction over the entire length of the main block body 7 in the vertical direction. The "comparative overall length block portion 81" is a portion of the comparative block body 8 that extends continuously in the vertical direction over the entire length of the comparative block body 8 in the vertical direction. Since the comparative block body 8 has a columnar shape, the comparative overall length block portion 81 of the comparative block body 8 in a state where the shear strain of the comparative block body 8 is 0% is the entire comparative block body 8. From the configuration A, the block body 7 is non-cylindrical, and the outer diameter D3 (FIG. 2) of the comparative block body 8 is larger than the minimum outer diameter D1 (FIG. 2) of the block body 7, and the present block body 7 is present. It is derived that the block body 7 is smaller than the maximum outer diameter D2 (FIG. 2). The "minimum outer diameter D1" of the block body 7 is the outer diameter of the block body 7 at the position where the outer diameter is the minimum. The "maximum outer diameter D2" of the block body 7 is the outer diameter of the block body 7 at the portion where the outer diameter is the maximum. The shape and dimensions of the block body 7 are determined by the shape and dimensions of each soft material layer 5 of the laminated structure 3. The shape of the block body 7 can be arbitrary as long as it is non-cylindrical.
In the present specification, the "axial cross-sectional area" refers to the area in the axial cross section.

FIG. 3A is an axial cross-sectional view showing the block body 7 of FIG. 2A in a state where the shear strain is S2 × 100%, and FIG. 3B is FIG. 2B. FIG. 5 is an axial cross-sectional view showing the comparative block body 8 of the above in a state where the shear strain is S2 × 100%. 3 (a) and 3 (b) are cross-sectional views, but hatching is omitted for the sake of clarity. Here, "S2" is a quadratic shape coefficient of the comparative block body 8, and specifically, S2 = D3 / T8.
In each embodiment of the present invention, the laminated structure 3 is the overlapping region 72 of the block body 7 in a state where the shear strain of the block body 7 is S2 × 100%, as in the embodiment shown in FIG. 3, for example. The area A72 is larger than the area A82 of the comparative overlapping region 82 of the comparative block body 8 in the state where the shear strain of the comparative block body 8 is S2 × 100% (hereinafter, this configuration is also referred to as “configuration B”).
The “main overlapping region 72” is an region in which the upper surface 7U and the lower surface 7L of the block body 7 overlap each other in the vertical direction. The “comparative overlapping region 82” is a region in which the upper surface 8U and the lower surface 8L of the comparison block body 8 overlap each other in the vertical direction. “A state in which the shear strain of the comparison block body 8 is S2 × 100%” means that the upper surface 8U of the comparison block body 8 is displaced horizontally with respect to the lower surface 8L by the outer diameter D3 of the comparison block body 8 in the vertical direction. Corresponds to a state in which the upper surface 8U and the lower surface 8L are adjacent to each other in the projected view of. Therefore, "the area A82 of the comparative overlapping region 82 of the comparative block body 8 in the state where the shear strain of the comparative block body 8 is S2 × 100%" is 0 (zero). Therefore, the configuration B is generated in the comparison block body 8 in a state where the shear strain of the block body 7 is S2 × 100% (until the upper surface 8U and the lower surface 8L of the comparison block body 8 are adjacent to each other in the vertical projection view). It is equivalent to the fact that the area A72 of the overlapping region 72 of the block body 7 is larger than 0 (zero) in the state where the shear strain and the same amount of shear strain are generated in the block body 7).

As described above, the seismic isolation device 1 of each embodiment of the present invention satisfies the configurations A and B.

Hereinafter, the operation and effect of the seismic isolation device 1 according to each embodiment of the present invention will be described.
According to the seismic isolation device 1 of each embodiment of the present invention, the configuration A (the axial cross-sectional area A71 of the full length block portion 71 of the block body 7 in the state where the shear strain of the block body 7 is 0% is Comparison of the comparison block body 8 in the state where the shear strain of the comparison block body 8 is 0% is smaller than the axial cross-sectional area A81 of the total length block portion 81) and configuration B (the shear strain of the main block body 7 is S2 × 100). The area A72 of the main overlapping region 72 of the main block body 7 in the state of% is larger than the area A82 of the comparative overlapping region 82 of the comparative block body 8 in the state where the shear strain of the comparative block body 8 is S2 × 100%). Therefore, a columnar laminated structure generally seen in the prior art is provided such that a virtual block body formed by laminating and integrating each soft material layer of the laminated structure becomes a comparative block body 8. Compared to the seismic isolation device, the laminated structure 3 is more firmly supported in the axial direction (vertical direction) when the seismic isolation device 1 is horizontally deformed while maintaining the same seismic isolation performance of the seismic isolation device 1. , 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 embodiment of the present invention, the area A72 (FIG. 3) of the overlapping region 72 when the shear strain of the block body 7 is S2 × 100% is the state where the shear strain of the comparative block body 8 is 0%. It is preferable that it is 0.05 times or more the axial cross-sectional area A81 (FIG. 2) of the comparative total length block portion 81, and it is more preferable that it is 0.09 times or more.
As a result, the buckling resistance performance can be further improved while maintaining the seismic isolation performance.
The area A72 (FIG. 3) of the overlapping region 72 in the state where the shear strain of the block body 7 is S2 × 100% is better with respect to the buckling strain.

As described above, the shape of the block body 7 can be arbitrary as long as it is non-cylindrical. The shape of the laminated structure 3 can be arbitrary as long as it is non-cylindrical.
It is preferable that the outer surface of the block body 7 is rotationally symmetric about the central axis O of the block body 7. It is preferable that the outer surface of the laminated structure 3 is also rotationally symmetric about the central axis O of the laminated structure 3.

FIG. 4 is an axial cross-sectional view showing the block body 7 corresponding to the seismic isolation device 1 according to the second embodiment of the present invention in a state where the shear strain is 0%, and corresponds to FIG. 2 (a). It is a drawing to be done. FIG. 5 is an axial cross-sectional view showing the block body 7 corresponding to the seismic isolation device 1 according to the third embodiment of the present invention in a state where the shear strain is 0%, and corresponds to FIG. 2 (a). It is a drawing to be done.
In each embodiment of the present invention, the block body 7 is at least one end of the upper side and the lower side of the block body 7, as in the respective embodiments of FIGS. 2 (a), 4 and 5. It is preferable to have a projecting portion 73 protruding toward the outer peripheral side from the full-length block portion 71 on the portion side. In this case, on the end side of at least one of the upper side and the lower side of the block body 7, the axially outer end of the protrusion 73 is located at the axially outer end of the block body 7. And.
As a result, if the block body 7 does not have the projecting portion 73, or if the projecting portion 73 is on the end side of at least one of the upper side and the lower side of the block body 7, the projecting portion 73 is the main block body. Compared with the case where the seismic isolation device 1 is horizontally deformed from the outer end in the axial direction of 7, the laminated structure 3 is more firmly supported in the axial direction (vertical direction). The buckling resistance performance of the seismic isolation device 1 can be improved.

When the block body 7 has a protruding portion 73 on both upper and lower end sides as in the respective embodiments of FIGS. 4 and 5, the embodiment of FIG. 2 (a) is used. As described above, the buckling resistance performance can be improved as compared with the case where the protruding portion 73 is provided only on the end side of either the upper side or the lower side thereof.
On the other hand, when the block body 7 has the protruding portion 73 only on the end side of either the upper side or the lower side thereof as in each embodiment of FIG. 2A, FIGS. 4 and 5 Compared to the case where the protrusions 73 are provided on both the upper and lower end sides as in the embodiment of the above, each hard material layer 4 constituting the laminated structure 3 is formed at the time of manufacturing the seismic isolation device 1. In addition, since the laminating work of each soft material layer 5 becomes easy, the manufacturability of the seismic isolation device 1 can be improved.

In each embodiment of the present invention, the protruding portion 73 of the block body 7 has a quadrangular shape as in each embodiment of FIGS. 2 and 4 or a triangle or the like as in the embodiment of FIG. 5 in the axial cross section. It may have any shape.

In each example described in the present specification, in the axial region corresponding to the protruding portion 73 of the block body 7, the axial cross-sectional area of the block body 7 is the embodiment of FIGS. 2A and 4A. As in the embodiment, the block body 7 may be constant along the axial direction up to the outer end in the axial direction, or as in the embodiment of FIG. 5, the outer end in the axial direction of the block body 7. It may gradually increase toward the outside in the axial direction.
As used herein, the term "gradual increase" is not limited to a case where a part is not kept constant but is always continuously increased, but a case where a part is kept constant (for example, a case where the amount is gradually increased). ) Is also included.
As in the embodiment of FIG. 5, in the axial region corresponding to the protruding portion 73 of the block body 7, the axial cross-sectional area of the block body 7 reaches the axially outer end of the block body 7. When the number gradually increases toward the outside in the axial direction, the axial cross-sectional area of the block body 7 is assumed to be the axial cross-sectional area of the block body 7 in the axial region corresponding to the protruding portion 73 of the block body 7. The buckling resistance performance of the seismic isolation device 1 can be improved as compared with the case where the number of the seismic isolation device 1 decreases toward the outside in the axial direction at least in one place until the end on the outer side in the axial direction of 7.
Further, as in the embodiment of FIG. 5, in the axial region corresponding to the protruding portion 73 of the block body 7, the axial cross-sectional area of the block body 7 is the outer end of the block body 7 in the axial direction. When the amount gradually increases toward the outside in the axial direction, as in each embodiment of FIGS. 2A and 4, the axial region corresponding to the protruding portion 73 of the block body 7 is formed. In the case where the seismic isolation device 1 is deformed in the horizontal direction, as compared with the case where the cross-sectional area in the axial direction of the block body 7 is constant along the axial direction up to the outer end in the axial direction of the block body 7. In the laminated structure 3, the portion of each soft material layer 5 in the vicinity of the portion forming the protruding portion 73 of the block body 7 warps inward in the axial direction so as to be separated from the flange plates 21 and 22 (hereinafter, , "Turning up") can be suppressed. As a result, it is possible to reduce the possibility that the portion of the soft material layer 5 of the laminated structure 3 that constitutes the protruding portion 73 of the block body 7 is fatigued or damaged due to the flipping up, and by extension, the risk of fatigue or damage is reduced. The durability of the seismic isolation device 1 can be improved.

Further, in each example described in the present specification, as in the embodiment of FIG. 5, the axial cross-sectional area of the block body 7 is the axial cross-sectional area of the block body 7 in the axial region corresponding to the protruding portion 73 of the block body 7. It is more preferable that the block body 7 is constantly increasing continuously without being kept constant in a part toward the outside in the axial direction of the laminated structure 3 up to the outer end in the axial direction of the block body 7. .. In this case, the flipping up of the laminated structure 3 can be further suppressed.

In each of the embodiments of FIGS. 2 and 4, the inner end of the protruding portion 73 in the axial direction is separated from the axial center of the block body 7 to the outer side in the axial direction, whereby the block body 7 is separated from the center in the axial direction. The axial cross-sectional area of the block body 7 is constant along the axial direction in the central portion inside the protruding portion 73 in the axial direction.
However, the axially inner end of the protruding portion 73 may be located at the center of the block body 7 in the axial direction as in the embodiment of FIG.

In the example of FIG. 1, in the laminated structure 3, each hard material layer 4 and each soft material layer 5 are not annular but solid, and the hard material layer 4 is formed on the central axis O of the laminated structure 3. And the soft material layer 5 are located, but the present invention is not limited to this. For example, in the laminated structure 3, each hard material layer 4 and each soft material layer 5 are formed in an annular shape, and the laminated structure is formed by the center hole of each hard material layer 4 and the center hole of each soft material layer 5. The body 3 has a central hole extending in the axial direction on the central axis O, and a columnar body may be arranged in the central hole. It is preferable that the columnar body is configured to be able to absorb vibration energy by plastic deformation. The columnar body can be composed of, for example, lead, tin, a tin alloy, or a thermoplastic resin.

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), 2a: Straight side portion, 2b: Curved linear side portion,
3: Laminated structure,
4: Hard material layer,
5: Soft material layer,
6: Coating layer,
7: This block body, 7U: Upper surface, 7L: Lower surface, 71: Full length block part, 72: This overlapping area, 73: Protruding part,
8: Comparison block body, 8U: Top surface, 8L: Bottom surface, 81: Comparison total length block part, 82: Comparison overlap area,
O, O': Central axis

Claims (3)

A seismic isolation device having a laminated structure having hard material layers and soft material layers alternately laminated in the vertical direction.
A virtual block body formed by vertically laminating the soft material layers of the laminated structure is referred to as a main block body.
A columnar block body having the same soft material as the soft material constituting the soft material layer, having the same horizontal rigidity and vertical length as the main block body, and having a central axis extending in the vertical direction. When calling it a comparison block
When the shear strain of the main block body is 0%, the axial cross-sectional area A71 of the full length block portion of the main block body that continuously extends in the vertical direction over the total length of the main block body in the vertical direction is A81. A81 Smaller than
When the secondary shape coefficient of the comparison block body is referred to as S2,
When the shear strain of the block body is S2 × 100%, the area A72 of the overlapping region where the upper surface and the lower surface of the block body overlap in the vertical direction is S2 × 100% of the shear strain of the comparison block body. A seismic isolation device in which the upper surface and the lower surface of the comparative block body are larger than the area A82 of the comparative overlapping region in which the upper surface and the lower surface of the comparative block body overlap in the vertical direction. The area A72 of the overlapping region when the shear strain of the block body is S2 × 100% is the axial cross-sectional area A81 of the comparative total length block portion when the shear strain of the comparison block body is 0%. The seismic isolation device according to claim 1, which is 0.05 times or more. The area A72 of the overlapping region when the shear strain of the block body is S2 × 100% is the axial cross-sectional area A81 of the comparative total length block portion when the shear strain of the comparison block body is 0%. The seismic isolation device according to claim 1, which is 0.09 times or more.

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