JP2023077571A - Seismic isolator - Google Patents

Abstract

To provide a seismic isolator in which the adhesion of rubbish such as sand and dust to a slide material can be suppressed.SOLUTION: A seismic isolator comprises an elastic body, and a first flange portion and a second flange portion which are fixed to both end faces in a lamination direction, of the elastic body respectively. The first flange portion comprises a first inside flange fixed to the elastic body, a first outside flange fixed to a first structure, and a first slide material relatively displacing the first inside flange and the first outside flange. The first slide material is covered with the first inside flange and the first outside flange, and the first outside flange is attached to the first inside flange in such a manner that the first outside flange is displaceable relatively to the first inside flange.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to seismic isolation devices.

Patent Literature 1 discloses a seismic isolation device that includes an elastic body, a flange portion fixed to an end surface of the elastic body, and a connecting jig that rotatably fixes the flange portion to a structure. The flange portion includes a sliding member disposed on the lower end surface of the flange portion, and the connecting jig includes an annular member extending along the outer peripheral surface of the flange portion and a sliding member and the structure. a sliding plate positioned on the As a result, when a torsional force is applied to the seismic isolation device, the sliding member and the sliding plate slide and the flange portion rotates with respect to the connecting jig, thereby suppressing torsional deformation of the elastic body. .

By the way, the annular member and the sliding plate are fixed together by bolts only to the structure, and Patent Document 1 does not describe or suggest that they are attached to the flange portion before the seismic isolation device is installed. do not have. From this, it is inferred that the annular member and the sliding plate are attached at the installation site of the seismic isolation device.

If the annular member and the sliding plate are attached to the flange at the installation site of the seismic isolation device, the sliding material arranged on the lower end surface of the flange will be exposed at the installation site, and dirt such as sand and dust will accumulate on the sliding surface of the sliding material. may adhere. If dirt such as sand or dust adheres to the sliding surface of the sliding member, the slidability between the flange portion and the sliding member deteriorates, and the effect of suppressing torsional deformation of the elastic body deteriorates.

JP 2014-105462 A

An object of the present disclosure is to provide a seismic isolation device capable of suppressing adhesion of dust such as sand and dust to a sliding member.

A seismic isolation device of the present disclosure includes an elastic body, and a first flange portion and a second flange portion fixed to both end faces in a stacking direction of the elastic body, and the first flange portion is attached to the elastic body. a fixed first inner flange; a first outer flange fixed to a first structure; and a first sliding member for relatively displacing the first inner flange and the first outer flange; 1 sliding material is covered by said 1st inner flange and said 1st outer flange, and said 1st outer flange is attached to said 1st inner flange so that a relative displacement is possible.

Front view of seismic isolation device according to Embodiment 1 II-II line sectional view of Fig. 1 III-III line sectional view of FIG. Cross-sectional view of a seismic isolation device according to Embodiment 2 Cross-sectional view of a seismic isolation device according to Embodiment 3 Cross-sectional view of a seismic isolation device according to Embodiment 4 Cross-sectional view of a seismic isolation device according to another embodiment Cross-sectional view of a seismic isolation device according to another embodiment

[Embodiment 1]
First, a seismic isolation device according to Embodiment 1 will be described with reference to FIGS. 1 to 3. FIG. In addition, in each figure (as well as in FIGS. 4 to 8), the dimensional ratio of the drawings and the actual dimensional ratio do not necessarily match, and the dimensional ratios between the drawings do not necessarily match. .

As shown in FIGS. 1 and 2, the seismic isolation device 1 according to the present embodiment includes an elastic body 2, first flange portions 3 fixed to both end surfaces of the elastic body 2 in the stacking direction (vertical direction), and second 2 flange portion 4; Although the first flange portion 3 is arranged below the elastic body 2 and the second flange portion 4 is arranged above the elastic body 2 in the present embodiment, the present invention is not limited to this. For example, the first flange portion 3 may be arranged above the elastic body 2 and the second flange portion 4 may be arranged below the elastic body 2 .

The elastic body 2 is arranged between the first flange portion 3 and the second flange portion 4 . In the present embodiment, the elastic body 2 is formed in a columnar shape in which rubber is laminated in the vertical direction, but it is not limited to this. For example, the elastic body 2 may be made by alternately laminating metal plates and rubber. Further, for example, the elastic body 2 may be formed in a prism shape.

As shown in FIG. 2, the first flange portion 3 is fixed to a first structure X1 such as a building foundation with bolts (not shown). A lower base plate may be interposed between the first flange portion 3 and the first structure X1. The first flange portion 3 includes a first inner flange 31 fixed to the elastic body 2, a first outer flange 32 fixed to the first structure X1, and the first inner flange 31 and the first outer flange 32. and a first sliding member 33 that is relatively displaced. The first outer flange 32 is attached to the first inner flange 31 so as to be relatively displaceable.

The first sliding member 33 is a disk having at least one surface (sliding surface described later) coated with a resin such as polytetrafluoroethylene (PTFE). The upper surface of the first sliding member 33 is fixed (eg, adhered) to the first inner flange 31 , and the lower surface (sliding surface) of the first sliding member 33 is in contact with the first outer flange 32 . The outer diameter of the first sliding member 33 is preferably 80 to 100% of the outer diameter of the elastic body 2 from the viewpoint of ensuring the durability of the first sliding member 33 against vertical load. The first sliding material 33 is covered by the first inner flange 31 and the first outer flange 32 .

By providing the first sliding member 33, when an external force in the torsional direction is applied to the seismic isolation device 1, the first sliding member 33 and the first outer flange 32 slide, and the first inner flange 31 and the first outer flange 31 slide. The flange 32 can be relatively displaced. Thereby, torsional deformation of the elastic body 2 can be suppressed. Note that the first sliding member 33 is not limited to the above. For example, the first sliding member 33 may be made of resin such as PTFE. Further, for example, the lower surface of the first sliding member 33 may be fixed to the first outer flange 32, and the upper surface of the first sliding member 33 may be in contact with the first inner flange 31. The first sliding member 33 may be , the first inner flange 31 and the first outer flange 32 .

As shown in FIGS. 2 and 3, the first inner flange 31 has a plurality of first inner insertion holes 311 through which bolts (not shown) can be inserted. The plurality of first inner insertion holes 311 are arranged at regular intervals in the outer peripheral direction of the elastic body 2 . The outer peripheral direction of the elastic body 2 is a horizontal direction along the outer peripheral surface of the elastic body 2 .

The first inner insertion hole 311 is an elongated hole that penetrates the first inner flange 31 and extends along the outer peripheral direction of the elastic body 2 . In this embodiment, the first inner insertion hole 311 is formed in an arc shape centering on the center line Lc of the elastic body 2 . The first inner insertion hole 311 is arranged on a circle C1 centered on the center line Lc of the elastic body 2 . The length of the first inner insertion hole 311 is appropriately set depending on the number of bolts, the rigidity of the first inner flange 31, and the like. From the viewpoint of ensuring the rigidity of the first inner flange 31, the ratio of the first inner insertion holes 311 on the circle C1 is preferably 50% or less. Note that the first inner insertion hole 311 is not limited to the above.

The first inner flange 31 includes a first inner counterbore 312 that can accommodate a bolt head or a nut (not shown) that engages the bolt. The first inner counterbore portion 312 is arranged at a position overlapping with the first inner insertion hole 311 in a plan view and on the upper surface side (the elastic body 2 side) of the first inner flange 31 . The first inner counterbore portion 312 is formed in an arc shape centered on the center line Lc of the elastic body 2 . Note that the first inner counterbore portion 312 is not limited to the above. For example, the first inner flange 31 may be configured without the first inner counterbore portion 312 .

The first outer flange 32 has a plurality of first outer insertion holes 321 through which bolts can be inserted. It is preferable that the centers of the plurality of first outer insertion holes 321 overlap the centers of (the arcs of) the first inner insertion holes 311 in the non-loaded state of the seismic isolation device 1 in plan view. The first outer insertion hole 321 is a general through hole penetrating through the first outer flange 32 . For example, the first outer insertion hole 321 may have substantially the same shape (arc shape) as the first inner insertion hole 311, and the first outer insertion hole 321 may be provided with a female thread. Further, for example, the first inner insertion hole 311 may be formed as a general through hole, and the first outer insertion hole 321 may be formed in an arc shape.

As shown in FIG. 2, the first outer flange 32 includes a first outer counterbore 322 that can accommodate a bolt head or nut. The first outer counterbore portion 322 is arranged at a position overlapping with the first outer insertion hole 321 in plan view and on the lower surface side of the first outer flange 32 (on the side of the first structure X1). The depth of the first outer counterbore portion 322 is preferably greater than the height of the bolt head or nut from the viewpoint of preventing the bolt head or nut from protruding from the lower surface of the first outer flange 32 . Note that the first outer counterbore portion 322 is not limited to the above.

The first inner flange 31 has a first inner fitting portion 313 rotatably fitted to the first outer flange 32 . In the present embodiment, the first inner fitting portion 313 is a circular protrusion that protrudes downward (toward the first structure X1) from the lower surface of the first inner flange 31, and is sheared from the first structure X1. It serves as a shear key that transmits force to the elastic body 2 . The outer diameter of the first inner fitting portion 313 is 90% or less than the outer diameter of the elastic body 2 from the viewpoint of securing the pressure receiving area of the first sliding member 33 and making the first inner flange 31 and the first outer flange 32 compact. 110% is preferred. By making the first inner flange 31 and the first outer flange 32 compact, the installation area of the seismic isolation device 1 can be reduced. Moreover, when a vertical tensile force is applied to the seismic isolation device 1, deformation (for example, bending) of the first inner flange 31 and the first outer flange 32 due to the bolts can be suppressed.

The first outer flange 32 includes a first outer fitting portion 323 rotatably fitted to the first inner fitting portion 313 . In the present embodiment, the first outer fitting portion 323 is a circular recess recessed downward (toward the first structure X1) from the upper surface of the first outer flange 32 . The gap between the first inner fitting portion 313 and the first outer fitting portion 323 is 5 mm or less from the viewpoint of suppressing the application of a shearing force to the bolt when an external force in the horizontal direction is applied to the seismic isolation device 1. is preferred.

As shown in FIG. 3, the first outer flange 32 includes a plurality of through holes 326 for bolting (not shown) to the first structure X1. The plurality of through holes 326 are arranged at equal intervals so as to surround the first inner flange 31 (in the outer peripheral direction of the elastic body 2).

As shown in FIG. 2, the second flange portion 4 is fixed to a second structure X2 such as a building frame with bolts (not shown). An upper base plate may be interposed between the second flange portion 4 and the second structure X2. In the present embodiment, the second flange portion 4 has substantially the same shape as the first flange portion 3, but the shape is not limited to this.

The second flange portion 4 includes a second inner flange 41 fixed to the elastic body 2, a second outer flange 42 fixed to the second structure X2, and the second inner flange 41 and the second outer flange 42. and a second sliding member 43 that is relatively displaced. The second outer flange 42 is attached to the second inner flange 41 so as to be relatively displaceable. In addition, for example, the second flange portion 4 may be a general flange plate that does not include the second sliding member 43 .

The second skid material 43 is substantially the same as the first skid material 33 . The lower surface of the second sliding member 43 is fixed (eg, glued) to the second inner flange 41 , and the upper surface (sliding surface) of the second sliding member 43 is in contact with the second outer flange 42 . The second sliding material 43 is covered with the second inner flange 41 and the second outer flange 42 .

By providing the second sliding member 43, when an external force in a torsional direction is applied to the seismic isolation device 1, the second outer flange 42 and the second sliding member 43 slide, and the second inner flange 41 and the second outer flange 41 slide. The flange 42 can be relatively displaced. Thereby, torsional deformation of the elastic body 2 can be suppressed. In addition, the second sliding member 43 is not limited to the above. For example, the upper surface of the second sliding member 43 may be fixed to the second outer flange 42 and the lower surface of the second sliding member 43 may be in contact with the second outer flange 42, and the second sliding member 43 may It does not have to be fixed to either the second inner flange 41 or the second outer flange 42 .

The second inner flange 41 has a plurality of second inner insertion holes 411 through which bolts (not shown) can be inserted. The plurality of second inner insertion holes 411 are arranged at regular intervals in the outer peripheral direction of the elastic body 2 .

The second inner insertion hole 411 is an elongated hole that penetrates the second inner flange 41 and extends along the outer peripheral direction of the elastic body 2 . In this embodiment, the second inner insertion hole 411 is formed in substantially the same shape as the first inner insertion hole 311 (see FIG. 3). That is, the second inner insertion hole 411 is formed in an arc shape centering on the center line Lc of the elastic body 2 . The plurality of second inner insertion holes 411 are arranged on a circle around the center line Lc of the elastic body 2 . The second inner insertion hole 411 is arranged at a position overlapping with the first inner insertion hole 311 in the no-load state of the seismic isolation device 1 in plan view. In addition, the second inner insertion hole 411 is not limited to the above.

The second inner flange 41 includes a second inner counterbore 412 that can accommodate a bolt head or a nut (not shown) that engages the bolt. The second inner counterbore portion 412 is arranged on the lower surface side (elastic body 2 side) of the second inner flange 41 at a position overlapping the second inner insertion hole 411 in plan view. The second inner counterbore portion 412 is formed in an arc shape centered on the center line Lc of the elastic body 2 . In addition, the second inner counterbore portion 412 is not limited to the above. For example, the second inner flange 41 may be configured without the second inner counterbore portion 412 .

The second outer flange 42 has a plurality of second outer insertion holes 421 through which bolts can be inserted. The centers of the plurality of second outer insertion holes 421 are preferably arranged at positions overlapping the centers of (the arcs of) the second inner insertion holes 411 in the non-loaded state of the seismic isolation device 1 in plan view. The second outer insertion hole 421 is a general through hole penetrating through the second outer flange 42 . In addition, the second outer insertion hole 421 is not limited to the above.

The second outer flange 42 includes a second outer counterbore 422 that can accommodate a bolt head or nut. The second outer counterbore portion 422 is arranged on the upper surface side of the second outer flange 42 . The depth of the second outer counterbore portion 422 is preferably greater than the height of the bolt head or nut from the viewpoint of preventing the bolt head or nut from protruding from the upper surface of the second outer flange 42 . In addition, the second outer counterbore portion 422 is not limited to the above.

The second inner flange 41 has a second inner fitting portion 413 rotatably fitted to the second outer flange 42 . In this embodiment, the second inner fitting portion 413 is a circular protrusion that protrudes upward (toward the second structure X2) from the upper surface of the second inner flange 41, and the shear force from the second structure X2 to the elastic body 2 as a shear key. The second inner fitting portion 413 has substantially the same shape as the first inner fitting portion 313, but is not limited thereto.

The second outer flange 42 has a second outer fitting portion 423 rotatably fitted to the second inner fitting portion 413 . In the present embodiment, the second outer fitting portion 423 is a circular recess that is recessed upward (toward the second structure X2) from the lower surface of the second outer flange 42, and is substantially the same as the first outer fitting portion 323. Although they are essentially the same shape, they are not limited to this.

The second outer flange 42 has a plurality of through holes (not shown) for fixing to the second structure X2 with bolts (not shown). The plurality of through holes are arranged at equal intervals so as to surround the second inner flange 41 (in the outer peripheral direction of the elastic body 2).

[Embodiment 2]
Next, a seismic isolation device according to Embodiment 2 will be described with reference to FIG. Descriptions of the same configurations as those of the seismic isolation device according to the first embodiment are omitted.

The first inner flange 31 includes an inner flange main body 314 fixed to the elastic body 2 , a first inner fitting portion 313 arranged below the inner flange main body 314 , and an inner flange main body 314 and the first inner fitting portion 313 . a first shear key 315 interposed between the portion 313; In this embodiment, the outer shape of the first inner flange 31 is the same as the outer shape of the first inner flange 31 (see FIG. 1) in the first embodiment.

The inner flange main body 314 and the first inner fitting portion 313 are discs formed separately. According to such a configuration, cutting for forming the first inner fitting portion 313 becomes unnecessary, and manufacturing of the first inner flange 31 can be facilitated. From the viewpoint of facilitating assembly of the seismic isolation device 1, the first inner fitting portion 313 is preferably fixed to the inner flange main body 314. As shown in FIG.

The inner flange body 314 includes a recess 314a for receiving the first shear key 315, and the first inner fitting 313 includes a recess 313a for receiving the first shear key 315. As shown in FIG. By fitting the first shearing key 315 into the recesses 314a and 313a, the shearing force from the first structure X1 can be transmitted to the elastic body 2. As shown in FIG. The first shear key 315 is preferably made of the same material as the inner flange body 314 and the first inner fitting 313 .

By arranging the first shear key 315 between the inner flange main body 314 and the first inner fitting portion 313, compared with the case where the shear key is provided between the seismic isolation device 1 and the first structure X1, , the height for lifting the second structure X2 in the replacement work of the seismic isolation device 1 can be reduced. Thereby, the replacement work of the seismic isolation device 1 can be facilitated. The second inner flange 41 is similar to the first inner flange 31 described above.

[Embodiment 3]
Next, a seismic isolation device according to Embodiment 3 will be described with reference to FIG. Descriptions of the same configurations as those of the seismic isolation device according to the first embodiment are omitted.

The first inner flange 31 includes an inner flange main body 314 fixed to the elastic body 2 and a first inner fitting portion 313 arranged below the inner flange main body 314 . In this embodiment, the outer shape of the first inner flange 31 is the same as the outer shape of the first inner flange 31 (see FIG. 1) in the first embodiment.

The inner flange main body 314 and the first inner fitting portion 313 are discs formed separately. The inner flange body 314 has a recess 314a into which the first inner fitting portion 313 is fitted. By fitting the first inner fitting portion 313 into the concave portion 314a, the first inner fitting portion 313 serves as a shear key that transmits the shear force from the first structure X1 to the elastic body 2. As shown in FIG. The second inner flange 41 is similar to the first inner flange 31 described above.

[Embodiment 4]
Next, a seismic isolation device according to Embodiment 4 will be described with reference to FIG. Descriptions of the same configurations as those of the seismic isolation device according to the first embodiment are omitted.

The first inner flange 31 has a first inner fitting portion 313 rotatably fitted to the first outer flange 32 . The first inner fitting portion 313 is a circular recess recessed upward (toward the elastic body 2 ) from the lower surface of the first inner flange 31 .

The first outer flange 32 includes a first outer fitting portion 323 rotatably fitted to the first inner fitting portion 313 . The first outer fitting portion 323 is a circular protrusion that protrudes upward (toward the elastic body 2) from the upper surface of the first outer flange 32, and transmits the shear force from the first structure X1 to the elastic body 2. serves as a key.

The first sliding member 33 is fixed to the first outer fitting portion 323 and is in contact with the first inner fitting portion 313 . As a result, when an external force in the torsional direction is applied to the seismic isolation device 1, the first sliding member 33 and the first inner flange 31 slide to displace the first inner flange 31 and the first outer flange 32 relative to each other. be able to. The second inner flange 41 and the second outer flange 42 are similar to the first inner flange 31 and the first outer flange 32 described above.

As described above, as in the above-described embodiment, the seismic isolation device 1 includes the elastic body 2, the first flange portion 3 and the second flange portion 4 fixed to both end faces in the stacking direction (vertical direction) of the elastic body 2, The first flange portion 3 includes a first inner flange 31 fixed to the elastic body 2, a first outer flange 32 fixed to the first structure X1, the first inner flange 31 and the first outer flange a first sliding member 33 for relatively displacing the first sliding member 32 with the first inner flange 31 and the first outer flange 32, the first outer flange 32 being covered by the first inner flange 31 and the first outer flange 32; 31 so as to be relatively displaceable.

According to such a configuration, the first sliding member 33 can be covered with the first inner flange 31 and the first outer flange 32 before the seismic isolation device 1 is installed. As a result, when the seismic isolation device 1 is installed, it is possible to prevent the first sliding member 33 from being exposed and dust such as sand and dust from adhering to the sliding surface of the first sliding member 33 . As a result, deterioration of the slidability of the first sliding member 33 due to adhesion of dust such as sand and dust can be suppressed, and torsional deformation of the elastic body 2 can be suppressed. Also, by arranging the first sliding member 33 in the seismic isolation device 1 before installing the seismic isolation device 1, for example, the friction coefficient at the time of relative displacement between the first inner flange 31 and the first outer flange 32 can be measured. and quality control of the coefficient of friction can be performed.

Further, as in the above-described embodiment, in the seismic isolation device 1 , the first inner flange 31 and/or the first outer flange 32 has the first inner flange 31 and/or the first inner flange 32 for inserting the bolt that attaches the first outer flange 32 to the first inner flange 31 . A configuration in which one insertion hole (first inner insertion hole 311 ) is provided and the first insertion hole (first inner insertion hole 311 ) is an elongated hole along the outer peripheral direction of the elastic body 2 is preferable.

According to such a configuration, when an external force in a torsional direction is applied to the seismic isolation device 1, the elastic body 2 fixed to the first inner flange 31 is moved along the first insertion hole (first inner insertion hole 311). can be rotated. By attaching the first outer flange 32 to the first inner flange 31 with bolts, the first inner flange 31 is prevented from separating from the first outer flange 32 when a tensile force is applied in the vertical direction of the seismic isolation device 1 . can be suppressed. Furthermore, by fixing the first inner flange 31 and the first outer flange 32 with bolts, it is possible to suppress an increase in the size of the first outer flange 32 compared to the case of fixing with the connecting jig of Patent Document 1. .

Further, as in the above-described embodiment, in the seismic isolation device 1, the second flange portion 4 includes a second inner flange 41 fixed to the elastic body 2 and a second outer flange 42 fixed to the second structure X2. and a second sliding member 43 for relatively displacing the second inner flange 41 and the second outer flange 42, the second sliding member 43 being covered by the second inner flange 41 and the second outer flange 42. , the second outer flange 42 is preferably attached to the second inner flange 41 so as to be relatively displaceable.

According to such a configuration, when an external force in a twisting direction is applied to the seismic isolation device 1, the second inner flange 41 and the second outer flange 42 are displaced relative to each other, and torsional deformation of the elastic body 2 can be suppressed. Thereby, in addition to the relative displacement between the first inner flange 31 and the first outer flange 32, the second inner flange 41 and the second outer flange 42 are also relatively displaced, thereby further suppressing the torsional deformation of the elastic body 2. be able to.

Further, as in the above-described embodiment, in the seismic isolation device 1 , the second inner flange 41 and/or the second outer flange 42 has a second outer flange 41 for inserting the bolt that attaches the second inner flange 42 to the second inner flange 41 . A configuration in which two insertion holes (second inner insertion holes 411 ) are provided and the second insertion holes (second inner insertion holes 411 ) are elongated holes along the outer peripheral direction of the elastic body 2 is preferable.

According to such a configuration, when an external force in a torsional direction is applied to the seismic isolation device 1, the elastic body 2 fixed to the second inner flange 41 is moved along the second insertion hole (second inner insertion hole 411). can be rotated. By attaching the second outer flange 42 to the second inner flange 41 with bolts, the second inner flange 41 is prevented from separating from the second outer flange 42 when a vertical tensile force is applied to the seismic isolation device 1 . can be suppressed. Furthermore, by fixing the second inner flange 41 and the second outer flange 42 with bolts, it is possible to suppress an increase in the size of the second outer flange 42 as compared with the case of fixing with the connecting jig.

It should be noted that the seismic isolation device 1 is not limited to the configurations of Embodiments 1 to 4, nor is it limited to the effects described above. Further, it goes without saying that the seismic isolation device 1 can be modified in various ways without departing from the gist of the present invention. For example, it is of course possible to arbitrarily select one or a plurality of the configurations according to the above embodiments and the configurations according to various modifications described below and employ them in the configurations according to the above embodiments 1 to 4. be.

(1) As shown in FIG. 7, in the first flange portion 3, the first inner fitting portion 313 provided on the first inner flange 31 extends upward from the lower surface of the first inner flange 31 (on the elastic body 2 side). The first outer flange 32 includes an outer flange main body 324 fixed to the elastic body 2 and a first outer fitting portion 313 rotatably fitted to the first inner fitting portion 313 . and a first shear key 325 that fits between the outer flange body 324 and the first outer mating portion 323 .

In such a configuration, the outer flange main body 324 and the first outer fitting portion 323 are discs formed separately. The outer flange body 324 includes a recess 324a for receiving the first shear key 325, and the first outer fitting 323 includes a recess 323a for receiving the first shear key 325. As shown in FIG. The second flange portion 4 is similar to the first flange portion 3 described above.

(2) As shown in FIG. 8, the first sliding member 33 may be composed of a plurality of ball bearings 33a. In such a configuration, the first flange portion 3 is provided with bearing grooves 34 for rolling ball bearings 33a. The bearing grooves 34 are formed in an annular shape around the center line Lc of the elastic body 2, and are arranged in a plurality of concentric circles. The bearing grooves 34 are arranged in the first inner fitting portion 313 and/or the first outer fitting portion 323 . The second flange portion 4 is similar to the first flange portion 3 described above.

REFERENCE SIGNS LIST 1 seismic isolation device 2 elastic body 3 first flange portion 31 first inner flange 311 first inner insertion hole 312 first inner counterbore portion 313 first inner fitting portion 313a... Recess 314... Inner flange main body 314a... Recess 315... First shear key 32... First outer flange 321... First outer insertion hole 322... First outer counterbore 323... First outer fitting Joint portion 323a... Recess 324... Outer flange main body 324a... Recess 325... First shear key 326... Through hole 33... First sliding member 33a... Ball bearing 34... Bearing groove 4... Second Flange part 41... Second inner flange 411... Second inner insertion hole 412... Second inner counterbore part 413... Second inner fitting part 42... Second outer flange 421... Second outer insertion hole 422... Second outer counterbore portion, 423... Second outer fitting portion, 43... Second sliding member, X1... First structure, X2... Second structure

Claims (4)

An elastic body, and a first flange portion and a second flange portion fixed to both end faces in the lamination direction of the elastic body,
The first flange portion relatively displaces a first inner flange fixed to the elastic body, a first outer flange fixed to the first structure, and the first inner flange and the first outer flange. a first sliding member;
the first sliding member is covered by the first inner flange and the first outer flange;
A seismic isolation device, wherein the first outer flange is attached to the first inner flange so as to be relatively displaceable. The first inner flange and/or the first outer flange has a first insertion hole for inserting a bolt that attaches the first outer flange to the first inner flange,
2. The seismic isolation device according to claim 1, wherein said first insertion hole is an elongated hole along the outer peripheral direction of said elastic body. The second flange portion relatively displaces a second inner flange fixed to the elastic body, a second outer flange fixed to the second structure, and the second inner flange and the second outer flange. a second sliding material,
the second sliding member is covered by the second inner flange and the second outer flange;
The seismic isolation device according to claim 1 or 2, wherein the second outer flange is attached to the second inner flange so as to be relatively displaceable. The second inner flange and/or the second outer flange has a second insertion hole for inserting a bolt that attaches the second outer flange to the second inner flange,
4. The seismic isolation device according to claim 3, wherein said second insertion hole is an elongated hole along the outer peripheral direction of said elastic body.

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