JP7394682B2 - Seismic isolation device - Google Patents

Description

The present invention relates to a seismic isolation device.

Conventional seismic isolation devices generally include hard material layers and soft material layers stacked alternately in the vertical direction (for example, Patent Document 1).

Japanese Patent Application Publication No. 2006-170233

However, in the conventional seismic isolation device, there was a risk of buckling when the seismic isolation device was deformed in the horizontal direction.

An object of the present invention is to provide a seismic isolation device that can improve buckling resistance.

The seismic isolation device of the present invention includes:
A seismic isolation device comprising a laminated structure having hard material layers and soft material layers alternately laminated in the vertical direction,
The outer diameter of the laminated structure gradually decreases toward either the upper side or the lower side over the entire length of the laminated structure in the axial direction.
According to the seismic isolation device of the present invention, buckling resistance can be improved.

In the seismic isolation device of the present invention,
Preferably, the laminated structure has an outer diameter that gradually decreases toward the upper side over the entire length of the laminated structure in the axial direction.
Thereby, the manufacturability of the seismic isolation device can be improved, and the installation work of the seismic isolation device 1 becomes easier.

In the seismic isolation device of the present invention,
The outer surface of the laminated structure may have a curved portion extending in a curved line in an axial cross section.

In the seismic isolation device of the present invention,
The outer surface of the laminated structure may have an inclined portion extending linearly in a direction inclined with respect to the axial direction in an axial cross section.

According to this invention, it is possible to provide a seismic isolation device that can improve buckling resistance.

FIG. 2 is an axial cross-sectional view showing the seismic isolation device according to the first embodiment of the present invention in a state where no horizontal deformation occurs. FIG. 7 is an axial cross-sectional view showing a seismic isolation device according to a second embodiment of the present invention in a state where no horizontal deformation occurs.

The seismic isolation device of the present invention is designed to suppress the transmission of earthquake shaking to structures (e.g., buildings, condominiums, detached houses, warehouses, etc., as well as bridges, etc.). It is preferable to place it between the structure and the structure.
EMBODIMENT OF THE INVENTION Below, embodiment of the seismic isolation device based on this invention will be illustrated and described with reference to drawings. Common components in each figure are given the same reference numerals.

FIG. 1 is a diagram for explaining a seismic isolation device 1 according to a first embodiment of the present invention. FIG. 2 is a diagram for explaining a seismic isolation device 1 according to a second embodiment of the present invention. 1 and 2 each show the base isolation device 1 in a state where no horizontal deformation occurs.
In the following, for convenience of explanation, the seismic isolation device 1 of each embodiment shown in FIGS. 1 and 2 will also be described.
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 with.

In this specification, the “center axis O” (hereinafter also simply referred to as “center axis O”) of the seismic isolation device 1 is the center axis of the laminated structure 3. The central axis O of the seismic isolation device 1 is oriented to extend in the vertical direction. In this specification, the "axial direction" of the seismic isolation device 1 is a direction parallel to the central axis O of the seismic isolation device 1. The “inner side in the axial direction” of the seismic isolation device 1 refers to the side closer to the center of the laminated structure 3 in the axial direction, and the “outer side in the axial direction” of the seismic isolation device 1 refers to the side closer to the center of the laminated structure 3 in the axial direction. (the side closer to the flange plates 21 and 22). Further, the “axially perpendicular direction” of the seismic isolation device 1 is a direction perpendicular to the axial direction of the seismic isolation device 1. In addition, the "inner circumferential side", "outer circumferential side", "radial direction", and "circumferential direction" of the seismic isolation device 1 refer to the "inner circumferential side" when centered on the central axis O of the seismic isolation device 1, Refers to the "outer circumferential side," "radial direction," and "circumferential direction," respectively. Moreover, "upper" and "lower" refer to "upper" and "lower" in the vertical direction, respectively.

The upper flange plate 21 has a superstructure (building body, etc.) of a structure (for example, a building, an apartment, a detached house, a warehouse, etc., a bridge, etc.) placed on the upper flange plate 21. It is configured to be coupled 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 (such as a foundation) of a 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 (such as a quadrangular shape) in an axis-perpendicular cross section.

The laminated structure 3 is arranged between the upper flange plate 21 and the lower flange plate 22. The laminated structure 3 includes a plurality of hard material layers 4, a plurality of soft material layers 5, and a covering layer 6. The hard material layers 4 and the soft material layers 5 are alternately stacked in the vertical direction. Each hard material layer 4 and each 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. A pair of soft material layers 5 arranged at both upper and lower ends of the laminated structure 3 are fixed to an upper flange plate 21 and a 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 preferred, and steel is more preferred. As in each example of FIGS. 1 and 2, it is preferable that the axial distance between the hard material layers 4 is uniform (constant); however, the axial distance between the hard material layers 4 may be irregular. It may be uniform (non-uniform). Here, "the axial distance between the hard material layers 4" refers to the axial distance between the axial centers of a pair of mutually adjacent hard material layers 4. Further, as in each example of FIGS. 1 and 2, it is preferable that the thickness of each hard material layer 4 is the same, but the thickness of each hard material layer 4 may be different from each other. good.
The soft material layer 5 is made of a soft material that is less hard (softer) than the hard material layer 4. As the soft material constituting the soft material layer 5, an elastic body is suitable, and rubber is more suitable. As the rubber that can constitute the soft material layer 5, natural rubber or synthetic rubber (high damping rubber, etc.) is suitable. As in each example of FIGS. 1 and 2, it is preferable that the thicknesses of the soft material layers 5 are the same, but the thicknesses of the soft material layers 5 may be different from each other.

The covering layer 6 covers the outer peripheral surfaces of the hard material layer 4 and the soft material layer 5. The material constituting the covering layer 6 is preferably an elastic body, and more preferably rubber. The material constituting the covering 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 covering layer 6 is constructed integrally with the soft material layer 5.
In each of the examples shown in FIGS. 1 and 2, the coating layer 6 covers the entire outer peripheral surface of the hard material layer 4 and the soft material layer 5, and in turn covers the entire outer peripheral surface of the laminated structure 3. It consists of However, the covering layer 6 may cover only a part of the outer peripheral surface of the hard material layer 4 and the soft material layer 5, and furthermore, may cover only a part of the outer peripheral surface of the laminated structure 3. You can leave it there. Further, the covering layer 6 may not be provided, and in that case, the outer circumferential surface of the laminated structure 3 is composed of only the outer circumferential surfaces of the hard material layer 4 and the soft material layer 5.

In this embodiment, the laminated structure 3, the hard material layer 4, the soft material layer 5, and the covering layer 6 each have an arbitrary outer edge shape such as a circle or a polygon (quadrangular, etc.) in the cross section perpendicular to the axis. You may do so.
In addition, in this specification, the "outer diameter" of each of the laminated structure 3, hard material layer 4, soft material layer 5, and coating layer 6 means that these have a non-circular outer edge shape in the axially perpendicular cross section. If so, it refers to the outer diameter of these circumscribed circles in the cross section perpendicular to the axis.

In each of the embodiments shown in FIGS. 1 and 2, the outer diameter of the layered structure 3 increases over the entire length in the axial direction of the layered structure 3 toward either the upper side or the lower side. It is gradually decreasing.
In this specification, "gradual decrease" is not limited to the case where the decrease is always continuous without being maintained constant in a part, but the case where it is maintained constant in a part (for example, in a stepwise manner in multiple stages). (in cases where it decreases) is also included.
More specifically, in each of the embodiments shown in FIGS. 1 and 2, the outer diameter of the laminated structure 3 is constant in some parts as it goes upward over the entire length of the laminated structure 3 in the axial direction. It is always decreasing continuously without being maintained at a constant value.
The outer surface of the laminated structure 3 is preferably configured rotationally symmetrically around the central axis O of the laminated structure 3.

The effects of the seismic isolation device 1 of each embodiment shown in FIGS. 1 and 2 will be described below.
First, in the seismic isolation device 1 of each of the embodiments shown in FIGS. 1 and 2, as described above, the laminated structure 3 has a structure in which either one of the upper side and the lower side ( In the examples in each figure, the outer diameter of the laminated structure 3 gradually decreases toward the top.
As a result, if the outer diameter of the laminated structure 3 at each position in the axial direction of the laminated structure 3 is set to one side ( When the seismic isolation device 1 is horizontally deformed, the laminated structure 3 is more firmly supported in the axial direction, compared to the case where the outer diameter of the laminated structure 3 at the end (in the example of each figure is the upper side) is the same. , the seismic isolation device 1 becomes less likely to buckle (in other words, the buckling resistance of the seismic isolation device 1 can be improved).
Further, according to the seismic isolation device 1 of each embodiment of FIGS. 1 to 2, if the outer diameter of the laminated structure 3 at each position in the axial direction of the laminated structure 3 is The seismic isolation device 1 is made softer than the case where the outer diameter is the same as the outer diameter of the laminated structure 3 at the other end (the lower side in the example in each figure) of the upper and lower sides of the laminated structure 3. Therefore, the period of the structure can be increased (in other words, the structure can sway more slowly), and the seismic isolation performance of the seismic isolation device 1 can be improved.
Furthermore, according to the seismic isolation device 1 of each embodiment shown in FIGS. 1 and 2, if the laminated structure 3 is When manufacturing the seismic isolation device 1, the work of laminating each hard material layer 4 and each soft material layer 5 constituting the laminated structure 3 becomes easier than when the outer diameter of the seismic isolation device 1 gradually increases. Therefore, the manufacturability of the seismic isolation device 1 can be improved.

In each example described in this specification, like each embodiment of FIG. It is preferable that the axially perpendicular cross-sectional area of the laminated structure 3 gradually decreases toward the side (upper side in the examples in each figure).
In addition, in this specification, the "axis-perpendicular cross-sectional area" refers to the area in the axis-perpendicular cross section.
As a result, if the axially perpendicular cross-sectional area of the laminated structure 3 at each position in the axial direction of the laminated structure 3 is When the seismic isolation device 1 is horizontally deformed, the laminated structure 3 becomes more firmly Since it is supported in the axial direction, the seismic isolation device 1 is less likely to buckle (in other words, the buckling resistance of the seismic isolation device 1 can be improved).
Furthermore, as a result, if the axial cross-sectional area of the laminated structure 3 at each position in the axial direction of the laminated structure 3 is Compared to the case where the cross-sectional area perpendicular to the axis of the laminated structure 3 at the other end (lower side in each figure) is the same, the seismic isolation device 1 can be made softer, so the length of the structure can be reduced. Periodization becomes possible (in other words, the structure sways more slowly), and as a result, the seismic isolation performance of the seismic isolation device 1 can be improved.
Additionally, if the axial cross-sectional area of the laminate structure 3 gradually increases toward the outside in the axial direction on both the upper and lower end sides of the laminate structure 3, In comparison, when manufacturing the seismic isolation device 1, the work of laminating each hard material layer 4 and each soft material layer 5 constituting the laminated structure 3 becomes easier, so the manufacturability of the seismic isolation device 1 can be improved. .

In each example described in this specification, like each embodiment of FIG. 1 and FIG. It is advantageous if the outer diameter of the tube gradually decreases.
As a result, compared to the case where the outer diameter of the laminated structure 3 gradually decreases toward the bottom over the entire length of the laminated structure 3 in the axial direction, the seismic isolation device 1 Manufacturability can be improved, and the installation work of the seismic isolation device 1 becomes easier.

In each example described in this specification, like each embodiment of FIG. 1 and FIG. It is preferable that the cross-sectional area of the axially perpendicular direction gradually decreases.
As a result, the laminated structure 3 is more seismically isolated than if the axial cross-sectional area of the laminated structure 3 gradually decreases toward the bottom over the entire length of the laminated structure 3 in the axial direction. The manufacturability of the device 1 can be improved, and the installation work of the seismic isolation device 1 can be facilitated.

In each example described in this specification, like the embodiment in FIG. 1, the outer surface of the laminated structure 3 has one or more curved portions 3C extending in a curved shape in the axial cross section. You can leave it there.
The curved portion 3C gradually extends toward the inner circumferential side as it goes toward either the upper side or the lower side (the upper side in the illustrated example).
The outer surface of the laminated structure 3 may consist entirely of the curved portion 3C, as in the example of FIG. 1, or may consist entirely of the curved portion 3C in the axial cross section. It may consist of at least one of a straight portion extending linearly in parallel and an inclined portion 3S described below. The outer surface of the laminated structure 3 may have only one curved portion 3C, as in the embodiment of FIG. Alternatively, the outer surface of the laminated structure 3 may have a plurality of curved portions 3C along the axial direction.

In each example described in this specification, as in the embodiment of FIG. 2, the outer surface of the laminated structure 3 has a slope extending linearly in a direction inclined at an acute angle with respect to the axial direction in the axial cross section. It may have one or more parts 3S.
The inclined portion 3S gradually extends toward the inner circumferential side as it goes toward either the upper side or the lower side (the upper side in the illustrated example).
In this case, when the seismic isolation device 1 is deformed in the horizontal direction, the other side of the upper and lower sides of the layered structure 3 ( In the example shown in the figure, the deformation at the outer peripheral side (lower side) becomes more uniform, so buckling resistance can be improved. Moreover, in this case, the curling up of the seismic isolation device 1 can be suppressed compared to a case where the entire outer circumferential surface of the laminated structure 3 consists of the curved portion 3C. Moreover, in this case, the seismic isolation device 1 becomes easier to manufacture than if the entire outer circumferential surface of the laminated structure 3 consists of the curved portion 3C.
The outer surface of the laminated structure 3 may be entirely composed of only the inclined portion 3S, as in the example of FIG. 2, or may be entirely composed of the inclined portion 3S, the straight portion and the curved portion 3C. It may consist of at least one of these. The outer surface of the laminated structure 3 may have only one inclined portion 3S, as in the embodiment of FIG. Alternatively, the outer surface of the laminated structure 3 may have a plurality of inclined portions 3S along the axial direction.

In each example described in this specification, the laminated structure 3 is disposed on either one of the upper side and the lower side (in the illustrated example It is more preferable that the outer diameter of the laminated structure 3 always decreases continuously toward the top) without being kept constant in a portion.
In this case, the buckling resistance and seismic isolation performance of the seismic isolation device 1 can be further improved.
Furthermore, according to this, if the outer diameter of the laminated structure 3 is constant on the other side (lower side in the example of each figure) of the upper and lower sides of the laminated structure 3, In comparison, when the seismic isolation device 1 is deformed in the horizontal direction, the outer circumferential portion on the other side (lower side in the example in each figure) of the upper and lower sides of the laminated structure 3 is moved away from the flange plates 21 and 22. It is possible to suppress curling back inward in the axial direction (hereinafter referred to as "curling up"). Thereby, it is possible to reduce the possibility that the soft material layer 5 will be fatigued or damaged in the outer peripheral side portion of the laminated structure 3 due to curling up, and as a result, the durability of the seismic isolation device 1 can be improved.

In each example described in this specification, the laminated structure 3 is disposed on either one of the upper side and the lower side (in the illustrated example It is more preferable that the axially perpendicular cross-sectional area of the laminated structure 3 always decreases continuously toward the top) without being kept constant in a portion. In this case, in addition to being able to improve the buckling resistance and seismic isolation performance of the seismic isolation device 1, it is also possible to suppress the stacked structure 3 from curling up.

In each example described in this specification, the laminated structure 3 has a plurality of (all) hard material layers 4 over the entire length of the laminated structure 3 in the axial direction, as in each example of FIGS. , each have an outer diameter that is equal to or less than the outer diameter of another hard material layer 4 adjacent to the other side (lower side in the example of each figure) of the upper side and the lower side with respect to the hard material layer 4 (i.e., It is preferable that the outer diameter of the plurality of (all) hard material layers 4 gradually decreases toward either the upper side or the lower side (the upper side in the example of each figure). As a result, if any one of the hard material layers 4 has the outer diameter of the other hard material layer 4 adjacent to the other side (the lower side in the example of each figure) of the upper side and the lower side with respect to the hard material layer 4, The buckling resistance of the seismic isolation device 1 can be improved and the manufacturability of the seismic isolation device 1 can be improved compared to the case where the outer diameter is larger than that of the seismic isolation device 1.

In each example described in this specification, the laminated structure 3 has a plurality of (all) hard material layers 4 over the entire length of the laminated structure 3 in the axial direction, as in each example of FIGS. , each having an axis-perpendicular cross-sectional area that is less than or equal to the axis-perpendicular cross-sectional area of another hard material layer 4 adjacent to the other hard material layer 4 on the upper side and the lower side (lower side in the example of each figure). (In other words, the axially perpendicular cross-sectional area of the plurality (all) hard material layers 4 gradually decreases toward either the upper side or the lower side (the upper side in the example of each figure). ) is preferred. As a result, if one of the hard material layers 4 is aligned with the axis of another hard material layer 4 adjacent to the other hard material layer 4 on the upper side and the lower side (lower side in the example of each figure) with respect to the hard material layer 4, The buckling resistance of the seismic isolation device 1 can be improved and the manufacturability of the seismic isolation device 1 can be improved compared to the case where the axially perpendicular cross-sectional area is larger than the directional cross-sectional area.

In addition, in each example described in this specification, the laminated structure 3 has a plurality of (all) hard material layers 4 over the entire length of the laminated structure 3 in the axial direction, as in the example of FIG. It has an outer diameter smaller than the outer diameter of another hard material layer 4 adjacent to the other hard material layer 4 on the upper side and the lower side (lower side in the example of each figure) (in other words, these The outer diameters of the plurality of hard material layers 4 always continuously decrease as they move toward either the upper side or the lower side (the upper side in the examples in each figure) without being kept constant in one part. ) is preferred. In this case, the buckling resistance and seismic isolation performance of the seismic isolation device 1 can be further improved. Moreover, the curling up of the laminated structure 3 is suppressed compared to the case where the outer diameter of each hard material layer 4 is the same on the other end side of the upper and lower sides of the laminated structure 3. be able to.

In addition, in each example described in this specification, the laminated structure 3 has a plurality of (all) hard material layers 4 over the entire length of the laminated structure 3 in the axial direction, as in the example of FIG. It has an axis-perpendicular cross-sectional area that is smaller than the axis-perpendicular cross-sectional area of another hard material layer 4 adjacent to the hard material layer 4 on the other side (lower side in the example of each figure) of the upper side and the lower side. (In other words, the axially perpendicular cross-sectional area of the plurality of hard material layers 4 is maintained constant in a portion as it goes toward either the upper side or the lower side (the upper side in the example of each figure). (always decreasing continuously) is preferable. In this case, the buckling resistance and seismic isolation performance of the seismic isolation device 1 can be further improved. Moreover, compared to the case where the axial cross-sectional area of each hard material layer 4 is the same on the other end side of the upper and lower sides of the laminate structure 3, the laminate structure 3 is curled up. can be suppressed.

In each of the examples shown in FIGS. 1 and 2, the laminated structure 3 has a solid structure in which each hard material layer 4 and each soft material layer 5 are not annular but are formed on the central axis O of the laminated structure 3. Although a hard material layer 4 and a soft material layer 5 are located, the present invention is not limited thereto. For example, in the laminated structure 3, each hard material layer 4 and each soft material layer 5 are configured in an annular shape, and the central hole of each hard material layer 4 and the central hole of each soft material layer 5 form a laminated structure. The body 3 has a central hole extending in the axial direction on its central axis O, and a columnar body may be arranged in the central hole. Preferably, the columnar body is configured to be able to absorb vibration energy through plastic deformation. The columnar body can be made of lead, tin, a tin alloy, or a thermoplastic resin, for example.

The seismic isolation device of the present invention is designed to suppress the transmission of earthquake shaking to structures (e.g., buildings, condominiums, detached houses, warehouses, etc., as well as bridges, etc.). It is preferable to place it between the structure and the structure.

1: Seismic isolation device,
21: Upper flange plate (flange plate), 22: Lower flange plate (flange plate),
3: Laminated structure, 3C: Curved part, 3S: Slanted part,
4: hard material layer,
5: Soft material layer,
6: Covering layer,
O: Center axis

Claims (4)

A seismic isolation device comprising a laminated structure having hard material layers and soft material layers alternately laminated in the vertical direction,
The laminated structure has an outer diameter that gradually decreases toward either the upper side or the lower side over the entire length in the axial direction of the laminated structure,
The laminated structure has a coating layer that covers the outer peripheral surface of each of the hard material layers and each of the soft material layers,
The material constituting the coating layer is the same as the soft material constituting each of the soft material layers,
The seismic isolation device , wherein each of the soft material layers has the same thickness . The seismic isolation device according to claim 1, wherein the laminated structure has an outer diameter that gradually decreases toward the upper side over the entire length of the laminated structure in the axial direction. The seismic isolation device according to claim 1 or 2, wherein the outer surface of the laminated structure has a curved portion extending in a curved line in an axial cross section. The seismic isolation device according to any one of claims 1 to 3, wherein the outer surface of the laminated structure has an inclined portion extending linearly in a direction inclined with respect to the axial direction in an axial cross section.

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