JP2021162040A - Seismic isolator - Google Patents

Abstract

To provide a seismic isolator that resists buckling deformation and achieves improved workability in the production.SOLUTION: A seismic isolator 1A has a laminated core 2 having hard material layers 21 and soft material layers 22 alternately disposed, and a reinforcement part 3 provided to at least one of the lower end 2a and the upper end 2b so as to surround the corresponding end.SELECTED DRAWING: Figure 1

Description

The present invention relates to a seismic isolation device.

In some seismic isolation devices, a laminated core provided between an upper plate and a lower plate is formed by alternately laminating hard material layers and soft material layers. When the seismic isolation device receives an external force in the horizontal direction, the laminated core of the seismic isolation device undergoes shear deformation due to the relative displacement of the upper end and the lower end of the laminated core in the horizontal direction. Therefore, when the seismic isolation device receives an external force in the horizontal direction, local stress concentration occurs in at least one end corner region of the upper end portion and the lower end portion of the laminated core. The stress concentration may cause buckling deformation in the laminated core.

On the other hand, in the conventional seismic isolation device, in order to suppress the buckling deformation that occurs in the laminated core, the hard material layer is close to the upper hard material layer arranged close to the upper plate and the lower plate. A lower hard material layer arranged and a plurality of intermediate hard material layers arranged between the upper hard material layer and the lower hard material layer are provided, and the upper hard material layer and the lower part are provided. Some have a horizontal length of at least one of the hard material layer longer than the horizontal length of the intermediate hard material layer (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-47926

On the other hand, in order to manufacture a laminated core, it is common to alternately stack hard material layers and soft material layers. However, in the case of the conventional seismic isolation device, the hard material layer and the soft material layer need to be laminated so that a constriction is formed in the vertical central portion of the laminated core. However, such a stacking operation is complicated because the stacking balance of the hard material layer and the soft material layer must be taken into consideration. Therefore, the seismic isolation device has room for improvement in workability during manufacturing.

An object of the present invention is to provide a seismic isolation device in which buckling deformation is less likely to occur and workability during manufacturing is improved.

The seismic isolation device according to the present invention surrounds a laminated core formed by alternately arranging hard material layers and soft material layers, and at least one of a lower end portion and an upper end portion of the laminated core. It is provided with a reinforcing portion provided as described above. According to the seismic isolation device according to the present invention, buckling deformation is less likely to occur and workability during manufacturing is improved.

In the seismic isolation device according to the present invention, when the reinforcing portion is provided at the lower end portion of the laminated core, the outer peripheral surface of the reinforcing portion is said to be directed toward the lower end surface of the laminated core in a vertical cross-sectional view. When the outer peripheral diameter of the reinforcing portion is inclined so as to expand outward and the reinforcing portion is provided at the upper end portion of the laminated core, the reinforcing portion is said to be oriented toward the upper end surface of the laminated core in a vertical cross-sectional view. It can be assumed that the outer peripheral diameter of the reinforcing portion is inclined so as to expand outward. In this case, local stress concentration can be further suppressed.

In the seismic isolation device according to the present invention, the reinforcing portion preferably contains a soft material. In this case, the seismic isolation performance of the laminated core can be ensured and buckling deformation can be suppressed.

In the seismic isolation device according to the present invention, it is preferable that the reinforcing portion includes a hard material layer. In this case, buckling deformation is less likely to occur.

In the seismic isolation device according to the present invention, it is preferable that the hard material layer of the reinforcing portion has a thickness different from that of the hard material layer of the laminated core. In this case, the design of the reinforcing portion can be given a degree of freedom.

In the seismic isolation device according to the present invention, the thickness of the hard material layer of the reinforcing portion may be thicker than the thickness of the hard material layer of the laminated core. In this case, buckling deformation is less likely to occur.

In the seismic isolation device according to the present invention, the thickness of the hard material layer of the reinforcing portion may be thinner than the thickness of the hard material layer of the laminated core. In this case, the rigidity of the entire reinforcing portion can be adjusted by increasing the rigidity of the entire reinforcing portion while finely adjusting the number of hard material layers.

In the seismic isolation device according to the present invention, it is preferable that the reinforcing portion is provided at both the lower end portion and the upper end portion of the laminated core. In this case, buckling deformation is less likely to occur.

In the seismic isolation device according to the present invention, the soft material layer of the laminated core and the soft material of the reinforcing portion may be formed of different materials. In this case, the rigidity of the entire seismic isolation device can be easily adjusted.

In the seismic isolation device according to the present invention, the hard material layer of the laminated core and the hard material layer of the reinforcing portion may be formed of different materials. In this case, the rigidity of the entire seismic isolation device can be easily adjusted.

According to the present invention, it is possible to provide a seismic isolation device in which buckling is less likely to occur and workability during manufacturing is improved.

FIG. 5 is a cross-sectional view schematically showing a seismic isolation device according to a first embodiment of the present invention in a vertical cross-sectional view. It is a figure which shows roughly the state when the seismic isolation device of FIG. 1 is sheared and deformed in the horizontal direction. It is sectional drawing which shows typically the seismic isolation device which concerns on 2nd Embodiment of this invention in the vertical sectional view.

Hereinafter, the seismic isolation device according to various embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view schematically showing a seismic isolation device 1A according to the first embodiment of the present invention in a vertical cross-sectional view. Referring to FIG. 1, the seismic isolation device 1A has a central axis O extending in the vertical direction (vertical direction), and can be erected along the central axis O. "Vertical cross-sectional view" means to show the seismic isolation device in a cross section including the central axis O.

The seismic isolation device 1A includes a laminated core 2. The laminated core 2 is formed by alternately arranging hard material layers 21 and soft material layers 22. The laminated core 2 includes at least one hard material layer 21 and at least one soft material layer 22, and the hard material layer 21 and the soft material layer 22 are alternately laminated in the vertical direction. In the present embodiment, the laminated core 2 includes a plurality of hard material layers 21 and a plurality of soft material layers 22.

The hard material layer 21 is a rigid material layer. In the present embodiment, the hard material layer 21 is made of a circular metal plate, specifically, a circular internal steel plate (steel plate). Further, the soft material layer 22 is a material layer having elasticity. In the present embodiment, the soft material layer 22 is a circular elastic plate, specifically, a circular internal rubber (rubber plate).

In the present embodiment, the laminated core 2 has a straight cylindrical shape along the central axis O. In other words, the diameter D2 of the laminated core 2 is the same along the central axis O. In the present embodiment, the diameter D21 of the hard material layer 21 and the diameter D22 of the soft material layer 22 are the same. The hard material layer 21 and the soft material layer 22 are arranged coaxially with respect to the central axis O. Further, in the present embodiment, the laminated core 2 includes a coating layer 23. The coating layer 23 is the outer peripheral portion of the laminated core 2. Here, the outer peripheral portion of the laminated core 2 refers to a portion that is the radial outer portion of the laminated core 2 and includes the outer peripheral surface 2fc of the laminated core 2. The coating layer 23 covers the outer peripheral surface 21fc of the hard material layer 21 and the outer peripheral surface 22fc of the soft material layer 22. In the present embodiment, the width W23 of the covering layer 23 is the same over the entire circumference around the central axis O. Here, the "width" is a width in the radial direction (horizontal direction: a direction orthogonal to the vertical direction).

The coating layer 23 is an elastic material layer. In the present embodiment, the coating layer 23 is a cylindrical elastic film, specifically, a cylindrical coating rubber (rubber film). In the present embodiment, the coating layer 23 is a protective layer that protects the soft material layer 22. As the protective layer, for example, rubber having strong weather resistance is used. The coating layer 23 can be omitted.

Further, in the seismic isolation device 1A, it is preferable that the thickness of each layer of the laminated core 2 is the same. In other words, it is preferable that the thickness t21 of the hard material layer 21 and the thickness t22 of the soft material layer 22 are the same. Here, the "thickness" means the thickness in the vertical direction, respectively. When any one of the hard material layer 21 and the soft material layer 22 is a plurality as in the present embodiment, the plurality of hard material layers 21 and the plurality of soft material layers 22 have the same thickness. It is preferable to have. However, the thickness t21 of the hard material layer 21 and the thickness t22 of the soft material layer 22 can be changed as appropriate.

Further, in the present embodiment, the seismic isolation device 1A includes a lower plate 4 and an upper plate 5. The lower end surface 5fa of the upper plate 5 is fixed to the upper end surface 2fb of the laminated core 2. The upper end surface 5fb of the upper plate 5 can be directly or indirectly fixed to a structure (not shown) such as a building, a bridge, a detached house, or an apartment house. Further, the upper end surface 4fb of the lower plate 4 is fixed to the lower end surface 2fa of the laminated core 2. The lower end surface 4fa of the lower plate 4 can be directly or indirectly fixed to a foundation (not shown) that supports the structure. In the present embodiment, the lower plate 4 and the upper plate 5 are each made of a circular metal plate, specifically, a circular internal steel plate (steel plate). However, the shapes of the lower plate 4 and the upper plate 5 can be changed as appropriate.

Further, the seismic isolation device 1A includes a reinforcing portion 3. The reinforcing portion 3 is provided on at least one of the lower end portion 2a and the upper end portion 2b of the laminated core 2 so as to surround the one. Here, the lower end portion 2a of the laminated core 2 means a lower end portion of the laminated core 2 including the lower end surface 2fa of the laminated core 2. In the present embodiment, the lower end portion 2a of the laminated core 2 has a lower end corner region A1 that is expected to easily generate local stress concentration when the seismic isolation device 1A receives an external force in the horizontal direction. It is the part to be included. Further, the upper end portion 2b of the laminated core 2 refers to a portion that is the upper end portion of the laminated core 2 and includes the upper end surface 2fb of the laminated core 2. In the present embodiment, the upper end portion 2b of the laminated core 2 has an upper end corner region A2 that is expected to easily generate local stress concentration when the seismic isolation device 1A receives an external force in the horizontal direction. It is the part to be included. Therefore, according to the present embodiment, stress concentration when the laminated core 2 is sheared and deformed can be suppressed more effectively.

In the present embodiment, the reinforcing portion 3 is configured separately from the laminated core 2. The reinforcing portion 3 contains a soft material. The reinforcing portion 3 is preferably made of a material having the same rigidity. For example, the reinforcing portion 3 is preferably made of the same soft material as the soft material layer 22. More preferably, the reinforcing portion 3 is made of a material having a higher rigidity than the soft material layer 22. In the present embodiment, the reinforcing portion 3 is an annular soft material member having higher rigidity than the soft material layer 22, specifically, an annular reinforcing rubber (rubber block).

In the seismic isolation device 1A, the lower end portion 2a of the laminated core 2 is provided with a lower reinforcing portion 3a so as to surround the lower end portion 2a of the laminated core 2. Further, in the seismic isolation device 1A, the upper end portion 2b of the laminated core 2 is provided with an upper reinforcing portion 3b so as to surround the upper end portion 2b of the laminated core 2.

The reinforcing portion 3 can be provided on the laminated core 2 by fixing it to the laminated core 2. As a specific example, the reinforcing portion 3 is passed through the laminated core 2 through an opening (through hole) formed inside the annular reinforcing portion 3, and the reinforcing portion 3 is passed through the lower end portion 2a or the upper end portion of the laminated core 2. After arranging it in 2b, it is fixed to the lower end 2a or the upper end 2b of the laminated core 2. The reinforcing portion 3 can be fixed to the laminated core 2 by adhesion, for example. In this case, a vulcanized molded product can be used for the laminated core 2 and the reinforcing portion 3. Further, the reinforcing portion 3 can be vulcanized together with the laminated core 2. In this case, the laminated core 2 and the reinforcing portion 3 can be the same body. Further, in this case, there is no coating layer on the boundary surface between the laminated core 2 and the reinforcing portion 3.

Further, when the reinforcing portion 3 is provided at the lower end portion 2a of the laminated core 2, the reinforcing portion 3 can be fixed to the lower plate 4. As a specific example, the lower reinforcing portion 3a is fixed to the lower plate 4 in advance, or the lower reinforcing portion 3a is laminated from the opening (through hole) formed inside the annular lower reinforcing portion 3a. After passing through 2 and arranging the lower reinforcing portion 3a at the lower end portion 2a of the laminated core 2, it is fixed to the lower plate 4. The lower reinforcing portion 3a can be fixed to the lower plate 4 by adhesion, for example. In this case, a vulcanized molded product can be used for the lower reinforcing portion 3a. Further, in this case, the lower reinforcing portion 3a can be vulcanized with respect to the lower plate 4. ..

Further, when the reinforcing portion 3 is provided on the upper end portion 2b of the laminated core 2, the reinforcing portion 3 can be fixed to the upper plate 5. As a specific example, the upper reinforcing portion 3b is fixed to the upper plate 5 in advance, or the upper reinforcing portion 3b is passed through the laminated core 2 through an opening (through hole) formed inside the annular upper reinforcing portion 3b. After arranging the upper reinforcing portion 3b on the upper end portion 2b of the laminated core 2, the upper reinforcing portion 3b is fixed to the upper plate 5. The upper reinforcing portion 3b can be fixed to the upper plate 5 by adhesion, for example. In this case, a vulcanized molded product can be used for the upper reinforcing portion 3b. Further, in this case, the upper reinforcing portion 3b can be vulcanized with respect to the upper plate 5. In the present embodiment, the upper reinforcing portion 3b is fixed to the lower end surface 5fa of the upper plate 5 by adhesion. Here, the term “adhesion” refers to the case where the unvulcanized upper reinforcing portion 3b is vulcanized and adhered to the upper plate 5 via an adhesive, and the case where the unvulcanized upper reinforcing portion 3b is directly vulcanized to the upper plate 5. Includes both when glued and when.

In the present embodiment, the reinforcing portion 3 is fixed to both the laminated core 2 and the plate (4,5) by, for example, adhesion, but at least one of the laminated core 2 and the plate (4,5). Can be fixed to one side. The method of fixing the laminated core 2 and the lower plate 4 and the method of fixing the laminated core 2 and the upper plate 5 can be different from each other.

Here, with reference to FIG. 2, concretely when at least one of the lower plate 4 and the upper plate 5 of the seismic isolation device 1A receives an external force in the horizontal direction and the laminated core 2 is shear-deformed in the horizontal direction. Explain the action. FIG. 2 shows a state in which the laminated core 2 is sheared and deformed due to the seismic isolation device 1A receiving an external force in the horizontal direction and causing the lower end 2a and the upper end 2b of the laminated core 2 to be displaced in the horizontal direction. It is a figure which shows schematicly.

Referring to FIG. 2, when the seismic isolation device 1A receives an external force in the horizontal direction, the lower plate 4 of the seismic isolation device 1A moves relative to the direction of the symbol Fa, while the upper plate 5 of the seismic isolation device 1A has a symbol. It moves relative to the direction of Fb. At this time, local stress concentration occurs in the lower end portion 2a of the laminated core 2 in the lower end portion corner region indicated by reference numeral A1. If the stress generated in the lower end corner region A1 becomes too large, the laminated core 2 may buckle.

On the other hand, in the seismic isolation device 1A, the lower end portion 2a of the laminated core 2 is provided with a lower reinforcing portion 3a so as to surround the lower end portion 2a of the laminated core 2. With reference to FIG. 2, the portion on the right side of the drawing of the lower reinforcing portion 3a (hereinafter, also referred to as “the portion on the right side of the drawing of the lower reinforcing portion 3a”) is the lower end portion on the right side of the drawing by supporting the laminated core 2. The stress concentration generated in the corner region A1 is suppressed. The lower reinforcing portion 3a increases the rigidity of the lower end portion 2a of the laminated core 2 to suppress the stress concentration generated in the lower end portion corner region A1 of the laminated core 2. Therefore, according to the seismic isolation device 1A, buckling deformation that occurs at the lower end portion 2a of the laminated core 2 can be suppressed.

Further, when the seismic isolation device 1A receives an external force in the horizontal direction, local stress concentration also occurs in the upper end portion 2b of the laminated core 2 in the upper end portion corner region indicated by the reference numeral A2. If the stress generated in the upper end corner region A2 becomes too large, the laminated core 2 may buckle.

On the other hand, in the seismic isolation device 1A, the upper end portion 2b of the laminated core 2 is also provided with an upper reinforcing portion 3b so as to surround the upper end portion 2b of the laminated core 2. With reference to FIG. 2, the portion on the left side of the drawing of the upper reinforcing portion 3b (hereinafter, also referred to as “the portion on the left side of the drawing of the upper reinforcing portion 3b”) supports the laminated core 2 to form the upper end corner region on the left side of the drawing. It suppresses the stress concentration that occurs in A2. The upper reinforcing portion 3b also increases the rigidity of the upper end portion 2b of the laminated core 2 to suppress the stress concentration generated in the upper end portion corner region A2 of the laminated core 2. Therefore, according to the seismic isolation device 1A, buckling deformation that occurs at the upper end portion 2b of the laminated core 2 can be suppressed.

As described above, according to the seismic isolation device 1A, the buckling deformation that occurs in the laminated core 2 can be suppressed. Therefore, according to the present embodiment, the buckling deformation that occurs in the laminated core 2 can be further suppressed.

Further, according to the seismic isolation device 1A, workability at the time of manufacturing is also improved.

An example of a method for manufacturing the seismic isolation device 1A will be schematically described with reference to FIG.

In this example, of the lower plate 4 and the upper plate 5, the lower plate 4 is installed in the mold. Then, in this example, unvulcanized soft material plates and hard plates are alternately laminated in the mold. The soft material plate forms a soft material layer 22. Examples of the soft material plate include an unvulcanized rubber sheet. The hard material plate forms the hard material layer 23. Examples of the hard material plate include a steel plate. As a result, the laminated core 2 is formed. Subsequently, in this example, the lower reinforcing portion 3a is installed in the mold. The lower reinforcing portion 3a can be an unvulcanized rubber block. Further, the lower reinforcing portion 3a can be installed by laminating an unvulcanized rubber sheet in the mold. In this example, after the lower reinforcing portion 3a is installed in the mold, the upper reinforcing portion 3b is installed in the mold. The upper reinforcing portion 3b can be an unvulcanized rubber block. Further, the upper reinforcing portion 3b can be installed by laminating an unvulcanized rubber sheet in the mold. In this case, the upper reinforcing portion 3b can be installed with the fall prevention jig assembled in the mold. Alternatively, in this case, the upper reinforcing portion 3b can be installed in a state where the mold is assembled. After that, the upper plate 5 is installed in the mold. Then, in this example, the mold is finally molded, and the soft material layer 22, the lower reinforcing portion 3a and the upper reinforcing portion 3b are vulcanized together with the hard material layer 21, the lower plate 4 and the upper plate 5. As a result, the seismic isolation device 1A can be manufactured.

Further, as a method of manufacturing the seismic isolation device 1A, the laminated core 2, the lower reinforcing portion 3a and the upper reinforcing portion 3b can be separately assembled, vulcanized, and then bonded later. In this case, since a jig is not required, the manufacturability is further improved.

As described above, according to the seismic isolation device 1A, the seismic isolation device 1A is manufactured without stacking the hard material layer and the soft material layer so that a constriction is formed in the vertical central portion of the laminated core 2. Can be done. Therefore, according to the seismic isolation device 1A, workability at the time of manufacturing is improved.

Claim 1: 0007
Therefore, according to the seismic isolation device 1A, buckling deformation is less likely to occur and workability during manufacturing is improved.

By the way, the reinforcing portion 3 can be formed into various cross-sectional shapes in a cross-sectional view in the extension direction. The cross-sectional shape of the reinforcing portion 3 can be, for example, a polygonal shape such as a triangular shape or a quadrangular shape, or a round shape including a perfect circular shape, an elliptical shape, or the like. In the present embodiment, the cross-sectional shape of the reinforcing portion 3 is triangular. Specifically, as shown in FIG. 1, the cross-sectional shape of the reinforcing portion 3 has two sides parallel to the central axis O (hereinafter, also referred to as “vertical side”) L1 and a horizontal axis (center). It has a right-angled triangular shape having a side (hereinafter, also referred to as “horizontal side”) L2 parallel to an axis (an axis orthogonal to the axis O). The vertical side L1 is, for example, the height of the center (dimension body) portion of the laminated core 2 with respect to the vertical height (height between the lower end surface 2fa and the upper end surface 3fb of the laminated core 2) H1 of the laminated core 2. H2 can be specified to be within the range of 0.6 to 00.0. Further, the horizontal side L2 can be defined so that, for example, the diameter D2 of the central portion of the laminated core 2 falls within the range of 0.65 to 0.96 with respect to the maximum diameter D3max of the reinforcing portion 3. ..

When the reinforcing portion 3 is provided at the lower end portion 2a of the laminated core 2, the outer peripheral surface 3fc of the reinforcing portion 3 has an outer peripheral diameter of the reinforcing portion 3 as it approaches the lower end surface 2fa of the laminated core 2 in a vertical cross-sectional view. It can be assumed that D3c is inclined so as to expand outward. Further, when the reinforcing portion 3 is provided on the upper end portion 2b of the laminated core 2, the outer peripheral surface 3fc of the reinforcing portion 3 of the reinforcing portion 3 is directed toward the upper end surface 2fb of the laminated core 2 in a vertical cross-sectional view. It can be assumed that the outer peripheral diameter D3c is inclined so as to expand outward. In this case, the weight of the reinforcing portion 3 is reduced by making the outer peripheral surface 3fc of the reinforcing portion 3 an inclined surface. Therefore, in this case, local stress concentration can be further suppressed.

Referring to FIG. 1, in the seismic isolation device 1A, the outer peripheral surface 3fc of the lower reinforcing portion 3a is the outer peripheral diameter D3c of the lower reinforcing portion 3a as it is directed toward the lower end surface 2fa of the laminated core 2 in a vertical cross-sectional view. Is tilted so that it expands outward. In the present embodiment, the outer peripheral surface 3fc of the lower reinforcing portion 3a is inclined at an acute angle side angle A3a with respect to the horizontal direction. Further, in the seismic isolation device 1A, the outer peripheral surface 3fc of the upper reinforcing portion 3b is arranged so that the outer peripheral diameter D3c of the upper reinforcing portion 3b expands outward toward the upper end surface 2fb of the laminated core 2 in a vertical cross-sectional view. It is tilted. In the present embodiment, the outer peripheral surface 3fc of the upper reinforcing portion 3b is inclined at an acute angle side angle A3b with respect to the horizontal direction. Therefore, according to the present embodiment, local stress concentration can be further suppressed.

As described above, in the present embodiment, the reinforcing portion 3 is a truncated cone-shaped flare structure in which an opening (through hole) is formed. Further, the inner peripheral surface 3fd of the reinforcing portion 3 extends in the vertical direction so as to cover the lower end portion 2a or the upper end portion 2b of the laminated core 2. Referring to FIG. 1, in the seismic isolation device 1A, the inner peripheral surface 3fd of the lower reinforcing portion 3a covers the lower end portion 2a of the laminated core 2 along the vertical direction. Further, in the seismic isolation device 1A, the inner peripheral surface 3fd of the upper reinforcing portion 3b covers the upper end portion 2b of the laminated core 2 along the vertical direction.

Further, in the seismic isolation device 1A, the reinforcing portion 3 contains a soft material. In this case, the seismic isolation performance of the laminated core 2 can be ensured and buckling deformation can be suppressed. In the present embodiment, the reinforcing portion 3 is an annular reinforcing rubber.

Further, in the seismic isolation device 1A, the soft material layer 22 of the laminated core 2 and the soft material of the reinforcing portion 3 can be formed of different materials. In this case, the rigidity of the entire seismic isolation device 1A can be easily adjusted.

In the seismic isolation device 1A, the reinforcing portion 3 includes a lower reinforcing portion 3a provided at the lower end portion 2a of the laminated core 2 and an upper reinforcing portion 3b provided at the upper end portion 2b of the laminated core 2. That is, in the present embodiment, the reinforcing portions 3 are provided on both the lower end portion 2a and the upper end portion 2b of the laminated core 2. In this case, local stress concentration that may occur in both the lower end corner region A1 and the upper end corner region A2 of the laminated core 2 can be suppressed. Therefore, according to the present embodiment, buckling deformation is less likely to occur.

FIG. 3 is a cross-sectional view schematically showing the seismic isolation device 1B according to the second embodiment of the present invention in a vertical cross-sectional view. In the following description, the components substantially the same as the seismic isolation device 1A of FIG. 1 will be omitted by using the same reference numerals.

Claim 4: 0010
In the seismic isolation device 1B, the reinforcing portion 3 includes a hard material layer 31. In this case, since the reinforcing portion 3 includes the hard material layer 31, the rigidity of the entire reinforcing portion 3 is increased. Therefore, in this case, buckling deformation is less likely to occur.

In the seismic isolation device 1B, the reinforcing portion 3 is formed by alternately arranging the hard material layer 31 and the soft material layer 32. The reinforcing portion 3 includes at least one hard material layer 31 and at least one soft material layer 32, and the hard material layer 31 and the soft material layer 32 are alternately laminated in the vertical direction. In the present embodiment, the reinforcing portion 3 includes a plurality of hard material layers 31 and a plurality of soft material layers 32.

In the seismic isolation device 1B, the hard material layer 31 of the reinforcing portion 3 is a material layer having rigidity similar to the hard material layer 21 of the laminated core 2. In the present embodiment, the hard material layer 31 is made of an annular metal plate, specifically, an annular internal steel plate (steel plate). Further, in the seismic isolation device 1B, the soft material layer 32 of the reinforcing portion 3 is a material layer having elasticity like the soft material layer 22 of the laminated core 2. In the present embodiment, the soft material layer 32 is an annular elastic plate, specifically, an annular internal rubber (rubber plate). The hard material layer 31 and the soft material layer 32 are arranged coaxially with respect to the central axis O. Further, the hard material layer 31 and the soft material layer 32 can be formed of the same material as the hard material layer 21 and the soft material layer 22, respectively.

In the seismic isolation device 1B, the soft material layer 22 of the laminated core 2 and the soft material layer 32 of the reinforcing portion 3 are preferably made of the same soft material as in the seismic isolation device 1A. However, in the seismic isolation device 1B, the soft material layer 22 of the laminated core 2 and the soft material layer 32 of the reinforcing portion 3 are each formed of different materials as in the seismic isolation device 1A. Can be done. In this case, the rigidity of the entire seismic isolation device 1B can be easily adjusted.

Further, in the seismic isolation device 1B, the hard material layer 22 of the laminated core 2 and the hard material layer 31 of the reinforcing portion 3 can be formed of different materials. In this case, the rigidity of the entire seismic isolation device 1B can be easily adjusted.

Similar to the seismic isolation device 1A, in the seismic isolation device 1B, the outer peripheral surface 3fc of the lower reinforcing portion 3a is the outer diameter of the lower reinforcing portion 3a as it approaches the lower end surface 2fa of the laminated core 2 in a vertical cross-sectional view. D3c is tilted so as to expand outward. The outer peripheral diameters D31c of the plurality of hard material layers 31 each expand outward from the laminated core 2 toward the lower end surface 2fa of the laminated core 2. Further, the outer peripheral diameters of the plurality of soft material layers 32 also expand outward from the laminated core 2 toward the lower end surface 2fa of the laminated core 2, respectively. Further, similarly to the seismic isolation device 1A, in the seismic isolation device 1B, the outer peripheral surface 3fc of the upper reinforcing portion 3b is the outer diameter of the upper reinforcing portion 3b as it is directed toward the upper end surface 2fb of the laminated core 2 in a vertical cross-sectional view. D3c is tilted so as to expand outward. In other words, the outer peripheral diameters D31c of the plurality of hard material layers 31 each expand outward from the laminated core 2 toward the upper end surface 2fb of the laminated core 2. Further, the outer peripheral diameters of the plurality of soft material layers 32 also expand outward from the laminated core 2 toward the lower end surface 2fa of the laminated core 2, respectively.

Further, in the present embodiment, the reinforcing portion 3 includes the covering outer layer 33. The outer coating layer 33 is an outer peripheral portion of the reinforcing portion 3. Here, the outer peripheral portion of the reinforcing portion 3 refers to a portion that is the radial outer portion of the reinforcing portion 3 and includes the outer peripheral surface 3fc of the reinforcing portion 3. In the present embodiment, the coating outer layer 33 covers the outer peripheral surface of the hard material layer 31. Further, in the present embodiment, the reinforcing portion 3 includes the coating inner layer 34. The coating inner layer 34 is an inner peripheral portion of the reinforcing portion 3. Here, the inner peripheral portion of the reinforcing portion 3 refers to a portion that is a radial inner portion of the reinforcing portion 3 and includes an inner peripheral surface 3fd of the reinforcing portion 3. In the present embodiment, the coating inner layer 34 covers the hard material layer 31. Also in this embodiment, as in the seismic isolation device 1A, when the laminated core 2 and the reinforcing layer 3 are the same body, there is no covering layer on the boundary surface between the laminated core 2 and the reinforcing layer 3.

According to the present embodiment, since the lower reinforcing portion 3a includes the hard material layer 31, the rigidity of the entire lower reinforcing portion 3a is increased. Therefore, according to the present embodiment, buckling deformation is less likely to occur. Further, according to the present embodiment, since the upper reinforcing portion 3b includes the hard material layer 31, the rigidity of the entire upper reinforcing portion 3b is increased. Therefore, according to the present embodiment, buckling deformation is less likely to occur.

Further, in the seismic isolation device 1B, it is preferable that the hard material layer 31 of the reinforcing portion 3 has a thickness t31 different from that of the hard material layer 21 of the laminated core 2. In this case, it is possible to give a degree of freedom in selecting the hard material layer 31 to be included in the reinforcing portion 3. That is, it is possible to give a degree of freedom to the design of the reinforcing portion 3. Therefore, in this case, the design of the seismic isolation device 1B can be provided with a degree of freedom. However, the thickness t31 of the hard material layer 31 of the reinforcing portion 3 can be the same thickness t21 as the hard material layer 21 of the laminated core 2.

In the seismic isolation device 1B, the thickness t31 of the hard material layer 31 of the reinforcing portion 3 may be thicker than the thickness t21 of the hard material layer 21 of the laminated core 2. In this case, the rigidity of the entire reinforcing portion 3 is further increased. In the present embodiment, the thickness t31 of the hard material layer 31 of the reinforcing portion 3 is thicker than the thickness t21 of the hard material layer 21 of the laminated core 2. Therefore, according to the present embodiment, buckling deformation is less likely to occur.

Alternatively, in the seismic isolation device 1B, the thickness t31 of the hard material layer 31 of the reinforcing portion 3 may be thinner than the thickness t21 of the hard material layer 21 of the laminated core 2. In this case, by suppressing the thickness t31 of the hard material layer 31, the number of hard material layers 31 that can be included in the reinforcing portion 3 can be increased. Therefore, in this case, the rigidity of the entire reinforcing portion 3 can be adjusted by increasing the rigidity of the entire reinforcing portion 3 while finely adjusting the number of the hard material layers 31.

The above has only disclosed some embodiments of the present invention, and various modifications can be made according to the claims. For example, the reinforcing portion 3 can be integrally formed together with the laminated core 2. In the case of the seismic isolation device 1A, the reinforcing portion 3 is formed into a laminated structure together with the laminated core 2. Specifically, the seismic isolation device 1A can form the reinforcing portion 3 by laminating a plurality of soft material layers 32, and can make the soft material layer 32 common with the soft material layer 22 of the laminated core 2. .. Further, also in the case of the seismic isolation device 1B, the reinforcing portion 3 is formed into a laminated structure together with the laminated core 2. Specifically, in the seismic isolation device 1B, the hard material layer 31 of the reinforcing portion 3 is separated, and a plurality of soft material layers 32 are laminated separately from the soft material layer 22 of the laminated core 2. Alternatively, the soft material layer 32 of the reinforcing portion 3 can be shared with the soft material layer 22 of the laminated core 2. As a result, the reinforcing portion 3 can be integrally formed together with the laminated core 2.

Further, the seismic isolation device (1A, 1B) may include a plug (core material). Specifically, in each embodiment, a plug extending along the central axis O can be passed through the central portion of the laminated core 2. The plug may be made of a metal such as lead or tin. The various configurations and dimensional specifications adopted in each of the above-described embodiments can be appropriately replaced with each other. For example, the vertical side L1 of the reinforcing portion 3 relating to the seismic isolation device 1B is also defined by the relationship between the vertical height H1 of the laminated core 2 and the height H2 of the central portion of the laminated core 2 as in the seismic isolation device 1A. can do. Further, the horizontal side L2 of the reinforcing portion 3 relating to the seismic isolation device 1B is also defined by the relationship between the diameter D2 of the central portion of the laminated core 2 and the maximum diameter D3max of the reinforcing portion 3 as in the seismic isolation device 1A. be able to.

1A: Seismic isolation device (first embodiment), 1B: Seismic isolation device (second embodiment), 2: Laminated core, 2a: Upper end of laminated core, 2b: Lower end of laminated core, 2fa: Laminated Lower end surface of core, 2fb: upper end surface of laminated core, 2fc: outer peripheral surface of laminated core, 2fd: inner peripheral surface of laminated core, 21: hard material layer of laminated core, 22: soft material layer of laminated core, 3: Reinforcing part, 3a: Lower reinforcing part, 3b: Upper reinforcing part, 3fc: Outer peripheral surface of reinforcing part, 3fd: Inner peripheral surface of reinforcing part, 31: Hard material layer of reinforcing part, 32: Soft material layer of reinforcing part , 4: Lower plate, 5: Upper plate, A1: Lower end corner area of laminated core, A2: Upper end corner area of laminated core, A3a: Acute angle side angle of outer peripheral surface of lower reinforcing part with respect to horizontal direction, A3b: Acute angle side angle of the outer peripheral surface of the upper reinforcing portion with respect to the horizontal direction, t21: thickness of the hard material layer of the laminated core, t22: thickness of the soft material layer of the laminated core, t31: thickness of the hard material layer of the reinforcing portion, t32: Thickness of the soft material layer of the reinforcing part, O: Central axis of the seismic isolation device

Claims (10)

A laminated core consisting of alternating hard and soft material layers,
At least one of the lower end and the upper end of the laminated core has a reinforcing portion provided so as to surround the one and a reinforcing portion.
A seismic isolation device equipped with. When the reinforcing portion is provided at the lower end portion of the laminated core, the outer peripheral surface of the reinforcing portion is such that the outer peripheral diameter of the reinforcing portion increases toward the lower end surface of the laminated core in a vertical cross-sectional view. When the reinforcing portion is provided at the upper end portion of the laminated core, the outer peripheral diameter of the reinforcing portion expands outward toward the upper end surface of the laminated core in a vertical cross-sectional view. The seismic isolation device according to claim 1, which is inclined to. The seismic isolation device according to claim 1 or 2, wherein the reinforcing portion contains a soft material. The seismic isolation device according to any one of claims 1 to 3, wherein the reinforcing portion includes a hard material layer. The seismic isolation device according to claim 4, wherein the hard material layer of the reinforcing portion has a thickness different from that of the hard material layer of the laminated core. The seismic isolation device according to claim 5, wherein the thickness of the hard material layer of the reinforcing portion is thicker than the thickness of the hard material layer of the laminated core. The seismic isolation device according to claim 5, wherein the thickness of the hard material layer of the reinforcing portion is thinner than the thickness of the hard material layer of the laminated core. The seismic isolation device according to any one of claims 1 to 7, wherein the reinforcing portion is provided at both the lower end portion and the upper end portion of the laminated core. The seismic isolation device according to claim 3, wherein the soft material layer of the laminated core and the soft material of the reinforcing portion are formed of different materials, respectively. The seismic isolation device according to claim 4, wherein the hard material layer of the laminated core and the hard material layer of the reinforcing portion are each formed of different materials.

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