JP2019019849A - Seismic isolation damper and seismic isolation system - Google Patents

Abstract

To provide a seismic isolation damper and a seismic isolation system that are excellent in arrangement while accommodating large displacements. A seismic isolation damper (2) is connected to a first mounting shaft (6A) provided on a seismic isolation structure (3) and a second mounting shaft (6B) provided on a non-base isolation structure (4) so as to be rotatable with respect to each other. A link mechanism that includes a plurality of arms 7A and 7B, one end of which is rotatably connected to the first mounting shaft 6A and the other end of which is rotatably connected to the second mounting shaft 6B; Any one of the arms 7A and 7B is connected, and the flywheel 14 having a rotation axis parallel to each rotation axis of the link mechanism is rotated by the operation of the link mechanism to generate a damping force. 9. [Selection] Figure 2

Description

  The present invention relates to a seismic isolation damper and a seismic isolation system disposed between a base isolation structure and a non-base isolation structure.

  One way to improve the seismic performance of structures such as equipment and buildings is to apply seismic isolation structures. The structure to which the seismic isolation structure is applied is arranged on the seismic isolation device. The seismic isolation device is deformed during the action of seismic motion and absorbs energy, thereby reducing the seismic load input to the structure.

  The seismic isolation device has a supporting performance for supporting a structure, a restoring performance against a displacement that occurs during an earthquake, and a damping performance that absorbs energy during the earthquake. For example, the supporting member having the supporting performance is a sliding bearing or a linear motion rolling bearing, the restoring member having the restoring performance is a coil spring, and the damping member having the damping performance is a steel damper, an oil damper, or a rotary inertia mass. It is a damper. Further, laminated rubber having both supporting performance and restoring performance, high damping rubber having both supporting performance, restoring performance, and damping performance and laminated rubber with lead plug are also a kind of seismic isolation device. Various types of seismic isolation systems including these combinations have been proposed and used in practice.

  For example, a steel damper, which is a kind of damping member, exhibits damping force (resistance force against input vibration energy) due to the hysteresis area due to the elasto-plastic response of the steel, and can handle vibrations in all directions within a horizontal plane. is there. However, in the elastic region, a seismic load equivalent to the case where the base is not isolated is transmitted to the base isolation structure. Therefore, in the steel damper, it is necessary to set a yield load and a stroke in which response reduction is effectively applied.

  The oil damper exhibits a damping force due to resistance when the oil passes through the orifice during operation of the piston mechanism filled with oil. Since the oil damper exhibits a damping force in the axial direction of the piston, when used in a horizontal two-dimensional seismic isolation building, it is necessary to arrange a pair of oil dampers in two orthogonal directions within one horizontal plane.

  The rotary inertia mass damper operates in the axial direction, and converts the relative displacement between the base isolation part and the non-base isolation part from a translational motion to a rotational motion by a ball screw mechanism. The rotary inertia mass damper rotates a flywheel (weight) fixed to the ball screw shaft in accordance with the rotary motion, and makes the seismic isolation response longer by the rotary inertia generated at that time. Further, the rotary inertia mass damper exhibits a damping force by generating a viscous resistance when a viscous body disposed around the flywheel is disturbed as the flywheel rotates. Since the rotary inertia mass damper operates in the axial direction of the ball screw shaft, when used in a horizontal two-dimensional seismic isolation building, it is necessary to arrange a pair of rotary inertia mass dampers in two orthogonal directions within a horizontal plane. is there.

  Damping members such as these oil dampers and rotary inertia mass dampers exhibit a damping force only in the axial direction. On the other hand, the damper system disclosed in Patent Document 1 has a toggle mechanism in which the damping member is connected to the seismic isolation part and the non-seismic isolation part via a plurality of arms, and only one damping member is provided. It is possible to cope with a two-dimensional response in a horizontal plane.

JP 2016-79611 A

  For example, when applying seismic isolation structures to structures that require high seismic safety, such as nuclear power plant facilities, seismic margins are required for large earthquake motions that occur less frequently and beyond the design range. A seismic isolation system that can handle large relative displacements will be adopted. Since the damping member provided in such a seismic isolation system requires a stroke corresponding to a large relative displacement (an operating range in which damping performance is exhibited), there is a problem that the damping member is increased in size and arrangement is deteriorated. is there.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a seismic isolation damper and a seismic isolation system that are excellent in arrangement while accommodating large displacements.

  The seismic isolation damper according to the present invention includes a first mounting portion provided in the base isolation structure, a second mounting portion provided in the non-base isolation structure, and a plurality of arms that are rotatably connected to each other. A link mechanism having one end rotatably connected to the first mounting portion and the other end rotatably connected to the second mounting portion, and any one of the plurality of arms Are connected, and a rotating mechanism having a rotating shaft that is parallel to each rotating shaft of the link mechanism is rotated by the operation of the link mechanism to generate a damping force.

  According to the present invention, the plurality of arms open and close in accordance with the relative displacement between the seismic isolation structure and the non-base isolation structure during an earthquake, and the plurality of arms are rotated and opened by the opening and closing operations of the plurality of arms. A damping force is exerted when the rotating body of the damping mechanism having a parallel rotating shaft generates a rotational motion. Therefore, the operation direction is not limited to one direction as in the case of oil dampers and rotary inertia mass dampers, and a plurality of arms and a damping mechanism can operate in all directions on one plane to exhibit damping performance. it can.

The front view which shows the seismic isolation system which concerns on Example 1. FIG. The top view which shows the whole seismic isolation system which concerns on Example 1. FIG. FIG. 3 is a plan view showing the seismic isolation damper according to the first embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 3 is a cross-sectional view showing a gearbox of the seismic isolation damper according to Embodiment 1. The front view which shows the operation state of the seismic isolation system of FIG. The top view which shows the operation state of the seismic isolation damper shown in FIG. The top view which shows the other operation state of the seismic isolation damper shown in FIG. The top view which shows the other operation state of the seismic isolation damper shown in FIG. The top view which shows the other operation state of the seismic isolation damper of FIG. The front view of the seismic isolation damper which concerns on Example 2. FIG. FIG. 12 is an elevation view showing an operating state of the seismic isolation damper of FIG. 11. The front view which shows the seismic isolation damper which concerns on Example 3. FIG. The front view which shows the operation state of the seismic isolation damper of FIG.

  Hereinafter, some embodiments will be described in detail with reference to the drawings.

  FIG. 1 is a front view showing the seismic isolation system.

  The base isolation system includes a laminated rubber 1 as a “base isolation device” having a support function and a restoration function, and a base isolation damper 2 having a damping performance. The seismic isolation system supports the base isolation structure 3 on the non-base isolation structure 4 via the laminated rubber 1 and the base isolation damper 2, and the base isolation structure 3, the base isolation structure 4, The relative vibration generated between the two is reduced.

  FIG. 2 is a plan view showing the entire seismic isolation system.

  In the seismic isolation system, for example, three laminated rubbers 1 (indicated by reference numerals 1A to 1C in FIG. 2) are arranged at equal intervals in three rows at equal intervals in a direction orthogonal to the arrangement direction (total 9). A total of four seismic isolation dampers 2 (in FIG. 2, denoted by reference numerals 2A to 2D) at approximately the middle between the four laminated rubbers 1 among the nine laminated rubbers 1 in total. Is shown).

  Returning to FIG. A rectangular plate-shaped first mounting panel 5 </ b> A is fixed substantially horizontally on the lower surface of the seismic isolation structure 3. On the lower surface of the first mounting panel 5A, a first mounting shaft 6A as a “first mounting portion” is erected downward.

  A second mounting panel 5B having the same shape as the first mounting panel 5A is fixed to the upper surface of the non-seismic isolation structure 4 substantially horizontally. On the upper surface of the second mounting panel 5B, a second mounting shaft 6B as a “second mounting portion” is erected upward.

  The seismic isolation damper 2 includes a first arm 7A and a second arm 7B that constitute a link mechanism, a speed increaser 8, and a damping mechanism 9.

  One end of the first arm 7A is rotatably connected to the first mounting shaft 6A. One end of the second arm 7B is rotatably connected to the other end of the first arm 7A. The other end of the second arm 7B is rotatably connected to the second mounting shaft 6B. The first arm 7A and the second arm 7B have rotation axes that are parallel to each other.

  FIG. 3 is a plan view showing the seismic isolation damper.

  A straight line passing through the first mounting shaft 6A provided in the seismic isolation structure 3 and the rotation center of the first arm 7A connected to the first mounting portion shaft 6A on the opposite side to the first mounting shaft 6A, and non-seismic isolation A straight line passing through the second mounting shaft 6B provided on the structure 4 and the rotation center on the opposite side of the second mounting shaft 6B of the second arm 7B connected to the second mounting shaft 6B intersects in plan view. doing. That is, in the initial arrangement state where no earthquake motion is input, the first arm 7A and the second arm 7B form an acute angle.

  FIG. 4 is a vertical sectional view showing a speed increaser and a speed reduction mechanism of the seismic isolation damper.

  On the lower surface of the other end of the first arm 7A, a shaft 10 connected to the speed increaser 8 is erected downward. A damping mechanism 9 is fixed to the upper surface of one end of the second arm 7B.

  The speed increaser 8 accommodates a plurality of gears 12 </ b> A to 12 </ b> C in the casing 11. The gear 12A is fixed to a shaft 10 that is erected downward from the other end of the first arm 7A.

  FIG. 5 is a cross-sectional view showing the speed increaser.

  The gear 12B is a two-stage gear, and an upper gear is connected to the gear 12A and a lower gear is connected to the gear 12C.

  Returning to FIG. The gear 12 </ b> C is fixed to the tip of the shaft of the flywheel 14 of the damping mechanism 9. The gear ratio of the gears 12A to 12C is 12A> 12B> 12C. The speed increaser 8 amplifies the amount of rotation input from the shaft 10 of the first arm 7 </ b> A and transmits the amplified amount to the damping mechanism 9.

  The damping mechanism 9 rotatably accommodates a flywheel 14 having a rotation axis parallel to the rotation axes of the first arm 7A and the second arm 7B in the casing 13. The casing 13 is formed in a cylindrical hollow shape, and is fixed to the upper surface of one end of the second arm 7B. An opening through which the tip of the flywheel 14 shaft is inserted is provided at the upper center of the casing 13, and the gear 12 </ b> C fixed to the tip of the flywheel 14 shaft is disposed outside the casing 13. The casing 13 is filled with a viscous body 15.

  Operation | movement of the seismic isolation system comprised as mentioned above is demonstrated using FIGS.

  6 is a front view showing an operation state when seismic motion acts on the seismic isolation system shown in FIG.

  When seismic motion is input to the non-base isolation structure 4, the laminated rubber 1 and the base isolation damper 2 are deformed, and the base isolation structure 3 is displaced to the right side of the page by the base isolation response. A relative displacement occurs between the non-base-isolated structure 4 and the base-isolated structure 4. In this seismic isolation system, the seismic isolation structure has a longer natural period due to deformation of the laminated rubber 1 and the damping force of the seismic isolation damper 2 is compared with the case where the seismic isolation structure is not applied. Thus, the seismic load transmitted to the seismic isolation structure 4 is reduced.

  FIG. 7 is a plan view showing an operating state of the seismic isolation damper of FIG.

  When the first mounting panel 5A fixed to the seismic isolation structure 3 moves in the right direction of the drawing due to the displacement of the seismic isolation structure 3 due to the seismic isolation response, the mounting panel 5B fixed to the non-base isolation structure 4 Relative displacement occurs between them. The first arm 7A and the second arm 7B constituting the link mechanism open and close in accordance with the relative displacement that occurs between the first mounting panel 5A and the second mounting panel 5B. The change in the angle formed by the first arm 7A and the second arm 7B due to the opening / closing operation is transmitted as a rotational motion to the damping mechanism 9 via the speed increaser 8, and the damping force is exhibited. Specifically, as described above, the rotation of the shaft 10 erected from the first arm 7A increases from the gear 12A in the gearbox 8 through the gear 12B to the gear 12C according to the gear ratio. Then, the flywheel 14 that is transmitted and fixes the gear 12C rotates. The rotational inertia generated by the rotational movement of the flywheel 14 acts to make the response of the seismic isolation structure 3 longer, so that the response of the seismic isolation structure 3 is reduced. Furthermore, the viscous body 15 is filled in the casing 13 of the damping mechanism 9, and the damping force acts by causing viscous damping by the viscous body 15 being disturbed by the rotational movement of the flywheel 14.

  Here, in the initial arrangement state of FIG. 3, a straight line passing through the first mounting shaft 6A and the rotation center on the opposite side of the first arm 7A connected to the first mounting portion shaft 6A with respect to the first mounting shaft 6A, A straight line passing through the two attachment shafts 6B and the rotation center on the opposite side of the second attachment shaft 6B of the second arm 7B connected to the second attachment shaft 6B intersects in a plan view. That is, when the first mounting shaft 6A and the second mounting shaft 6B are disposed at the same position in plan view, the first arm 7A connected to the first mounting shaft 6A and the second arm connected to the second mounting shaft 6B. This is because the arm 7B overlaps the planar view, and the link mechanism does not operate. Thereby, it can avoid that the seismic isolation damper 2 does not operate | move with the 1st arm 7A and the 2nd arm 7B overlapping in planar view.

  FIG. 8 is a plan view showing a response state of the seismic isolation damper when an earthquake acts in the upward direction on the paper.

  Since the seismic isolation damper 2 is rotatably connected to the seismic isolation structure 3 and the non-base isolation structure 4, the operation is not limited to one direction like an oil damper or a rotary inertia mass damper. As shown in FIG. 8, it can operate in any direction on a horizontal plane to exhibit damping performance.

  FIG. 9 shows a state where the seismic isolation damper responds to the maximum stroke when a strong earthquake acts in the upper right direction of the page.

  The maximum stroke of the seismic isolation damper 1 is a length obtained by adding the lengths of the first arm 7A and the second arm 7B. Referring to the initial arrangement state shown in FIG. 3, the seismic isolation damper 1 can be initially arranged with a length that is half the maximum stroke, and is excellent in arrangement. Furthermore, the stroke can be set according to the length of both arms 7A and 7B, and the damping force can be set by adjusting the speed increaser 8 and the damping mechanism 9, so that the design can be easily changed according to the required specifications of response displacement and damping performance. Is possible.

  FIG. 10 shows the response state of the seismic isolation damper when the seismic isolation structure 3 responds slightly in the upper right direction of the page due to a relatively small earthquake.

  In the seismic isolation damper 1, as shown in FIG. 4, the rotation amount is amplified by the speed increaser 8 and transmitted to the damping mechanism 9, so that the flywheel 14 rotates even when no large displacement occurs. A damping force can be obtained. Therefore, in order to cope with a large displacement, even when a design corresponding to a large stroke is performed, a design in which a damping force is applied even when a relatively small earthquake motion is applied is possible.

According to this embodiment, the seismic isolation damper 2 is rotatable relative to the first mounting shaft 6A provided on the base isolation structure 3 and the second mounting shaft 6B provided on the non-base isolation structure 4. A link constituted by the connected first arm 7A and second arm 7B, one end of which is rotatably connected to the first mounting shaft 6A and the other end of which is rotatably connected to the second mounting shaft 6B. The mechanism and the arms 7A and 7B are connected to each other, and a fly mechanism 14 having a rotation axis parallel to each rotation axis of the link mechanism is rotated by the operation of the link mechanism to generate a damping mechanism 9 that generates a damping force.

As a result, the seismic isolation damper 2 opens and closes according to the relative displacement between the base isolation structure 3 and the non-base isolation structure 4 during the earthquake, and the arms 7A and 7B open and close. A damping force is exerted by the flywheel 14 rotating. That is, the seismic isolation damper 2 is not limited to one direction of operation like an oil damper or a rotary inertia mass damper.
It can operate in any direction on the horizontal plane to exhibit damping performance. Furthermore, not only can the stroke be adjusted by the length of both arms 7A and 7B, but also the maximum stroke can be obtained as the total length of the arms. In the seismic isolation damper 2 composed of both arms 7A and 7B, In the initial arrangement state, installation can be performed with a length that is half the maximum stroke, and the installation size can be reduced. As described above, the damping performance can be exhibited in all directions on the horizontal plane, and since the initial arrangement dimension with respect to the maximum stroke is small, the arrangement is excellent. Therefore, it is possible to deal with a large displacement, and can exhibit a damping force in all directions on the horizontal plane.

  Of the plurality of arms, the first arm 7A connected to the damping mechanism 9 and the damping mechanism 9 are connected via a speed increaser 8 that increases the rotational speed of the flywheel 14. Accordingly, the damping force can be adjusted by the damping mechanism 9 and the speed increaser 8, respectively, and the design of the seismic isolation damper 2 becomes easy. Furthermore, rotation can be amplified and transmitted to the damping mechanism 9 by the speed increaser 8, and damping can be effectively applied even when a large displacement does not occur.

  The speed reduction mechanism 9 includes a casing 13 that houses the flywheel 14 and a viscous body 15 that is filled between the flywheel 14 and the casing 13. Thereby, damping force can be adjusted with the viscous body 15, and the design of the seismic isolation damper 2 becomes easy.

  Since the speed reduction mechanism 9 is disposed between the first arm 7A and the second arm 7B, it is possible to effectively provide attenuation to any rotational operation of both the arms 7A and 7B.

  In the present embodiment, the above configuration is not limited. For example, the seismic isolation damper 2 may be disposed in a direction intersecting the horizontal direction. That is, each rotation shaft of the link mechanism and the rotation shaft of the flyhole 14 may be inclined in the horizontal direction.

  Further, the speed increaser 8 may or may not be connected to at least one of the first arm 7A and the second arm 7B.

  Further, the first mounting shaft 6A or the second mounting shaft 6B may be provided directly on the seismic isolation structure 3 or the non-base isolation structure 4 without the first mounting panel 5A.

  A configuration of the seismic isolation damper according to the second embodiment will be described.

  FIG. 11 is a front view illustrating the seismic isolation damper according to the second embodiment. Each of the following embodiments including this embodiment corresponds to a modification of the first embodiment. Therefore, the difference from the first embodiment will be mainly described.

  When the seismic isolation damper 2 according to the present embodiment is compared with the first embodiment, the installation position and quantity of the damping mechanism 9 and the speed increaser 8 are changed. That is, in the seismic isolation damper 2 of the first embodiment, the damping mechanism 9 is provided between the first arm 7A and the second arm 7B. On the other hand, in the seismic isolation damper 2 according to the second embodiment, the damping mechanism 9A is provided between the seismic isolation structure 3 and the first mounting shaft 6A, and the damping mechanism 9B includes the non-base isolation structure 4 and the first It is provided between the two mounting shafts 6B.

  Specifically, in the seismic isolation damper 2 of the second embodiment, the damping mechanism 9A is fixed to the mounting panel 5A fixed to the seismic isolation structure 3, and the speed increaser 8A is connected to the damping mechanism 9A. The first mounting shaft 6A is connected to 8A, one end of the first arm 7A is connected to the first mounting shaft 6A, and the other end of the first arm 7A is rotatably connected to one end of the second arm 7B. Connected. Further, the damping mechanism 9B is fixed to the mounting panel 5B fixed to the non-seismic isolation structure 4, the speed increasing device 9B is connected to the damping mechanism 9B, the second mounting shaft 6B is connected to the speed increasing device 9B, The other end of the second arm 7B is connected to the two mounting shafts 6B, and one end of the second arm 7B is connected to the shaft 10 that is rotatably connected to the first arm 7A.

  FIG. 12 is a front view showing the operation state of FIG.

  Here, as a response at the time of an earthquake, a swinging behavior in which the seismic isolation structure 3 draws a concentric locus in the horizontal direction may occur. In that case, the relative displacement between the base isolation structure 3 and the non-base isolation structure 4 remains constant, and the angle formed by the first arm 7A and the second arm 7B does not change. In addition, when the damping mechanism 9 is provided at the connection portion between the first arm 7A and the second arm 7B, a damping force cannot be obtained.

  According to the present embodiment, the attachment mechanisms 5A and 5B are provided with the damping mechanisms 9A and 9B and the speed-up gears 8A and 8B, respectively, thereby forming a link mechanism using both ends of both arms 7A and 7B as rotation axes. Then, both arms 7A and 7B open and close in accordance with the relative displacement between the seismic isolation structure 3 and the non-base isolation structure 4, and the rotation by the opening and closing operation is transmitted to the damping mechanisms 9A and 9B to be attenuated. Power is demonstrated. Therefore, even in the case of a swinging behavior, a rotational force acts on the damping mechanisms 9A and 9B, so that a damping force can be obtained.

  In the present embodiment, the above configuration is not limited. For example, the damping mechanisms 9A and 9B are provided between the seismic isolation structure 3 and the first mounting shaft 6A, or between the non-base isolation structure 4 and the second mounting. You may arrange | position in any one between shaft 6B, and do not need to provide.

  The seismic isolation damper according to Example 3 will be described.

  FIG. 13 is a front view showing the seismic isolation damper according to the third embodiment, and FIG. 14 is a front view showing the operation state of FIG.

  The seismic isolation damper 2 according to the present embodiment has three arms 7A to 7C and four damping mechanisms 9A to 9D and four speed increasers 8A to 8D. Different from Example 2.

  Damping mechanisms 9A and 9B and speed increasers 8A and 8B are connected to mounting panels 5A and 5B fixed to seismic isolation structure 2 and non-base isolation structure 3, respectively, and first arm 7A is connected to speed increaser 9A. The configuration is the same as that of the second embodiment in that one end is connected and the other end of the second arm 7B is connected to the speed increaser 9B. In the seismic isolation damper 2 according to the present embodiment, the speed reduction mechanisms 9C and 9D and the speed increasers 8C and 8D are connected to the other end of the first arm 7A and the one end of the second arm 7B, respectively. The speed reduction mechanism 9C and the speed increasing device 8D are connected by the third arm 7C.

  According to the present embodiment, since the maximum stroke is obtained as the sum of the first arm 7A, the second arm 7B, and the third arm 7C, it is possible to cope with a larger relative displacement. In the seismic isolation damper 2 composed of the three arms 7A to 7C, the bending load acting on the first to third arms 7A to 7C during the rotation operation is compared with the case where the two arms 7A and 7B are configured. Therefore, a rational arm cross-sectional shape can be designed. Since the dimension of the initial arrangement state is 1/3 of the maximum stroke, the arrangement is excellent. Since the speed reduction mechanisms 9A to 9D and the speed increasers 8A to 8D are provided in all the movable parts that can rotate, it is possible to exert a damping force for responses in all directions on the horizontal plane including the swing. is there.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and another configuration can be added to the configuration of a certain embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  In the said Example, although the laminated rubber 1 demonstrated the seismic isolation effect by providing between the seismic isolation structure 3 and the non-base isolation structure 4 as a seismic isolation apparatus, For example, a sliding bearing or a rolling bearing may be used.

  Furthermore, in the said Example, although it had the two or three arms 7, the number of the arms 7 is not limited to this, For example, four or more may be sufficient.

  Further, in the above embodiment, the speed increaser 8 is configured by the three gears 12A to 12C and the rotation angle is increased. However, the speed increase mechanism 8 is not limited to this, and for example, a planetary gear or a wave gear device. It may be.

  Furthermore, in the above-described embodiment, the damping effect is exhibited by the damping mechanism 9 configured by the flywheel 14 and the viscous body 15, but the present invention is not limited to this configuration. The mechanism to give may be sufficient.

  Furthermore, the present invention can be implemented in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1,1A-1C ... Laminated rubber, 2, 2A-2D ... Base isolation damper, 3 ... Base isolation structure, 4 ... Non-base isolation structure, 6A ... First attachment axis, 6B ... Second attachment axis, 7A ... 1st arm, 7B ... 2nd arm, 7C ... 3rd arm, 8, 8A-8D ... Speed up gear, 9, 9A-9D ... Damping mechanism

Claims (7)

A first mounting portion provided in the seismic isolation structure;
A second mounting portion provided in the non-base-isolated structure;
A link mechanism configured by a plurality of arms rotatably connected to each other, one end of which is rotatably connected to the first mounting portion and the other end of which is rotatably connected to the second mounting portion; ,
A damping mechanism in which any one of the plurality of arms is connected, and a rotating body having a rotation shaft that is parallel to each rotation shaft of the link mechanism is rotated by the operation of the link mechanism to generate a damping force; Seismic isolation damper equipped with. Of the plurality of arms, the arm connected to the damping mechanism and the damping mechanism are connected via a speed increaser that increases the rotational speed of the rotating body.
The seismic isolation damper according to claim 1. The damping mechanism is
A casing for housing the rotating body;
A viscous body filled between the rotating body and the casing,
The seismic isolation damper according to claim 1 or 2. The damping mechanism is disposed between the arms;
The seismic isolation damper according to any one of claims 1 to 3. The damping mechanism is disposed between at least one of the base isolation structure and the first mounting portion, or between the non-base isolation structure and the second mounting portion.
The seismic isolation damper according to any one of claims 1 to 4. A straight line passing through the first attachment portion and a rotation center of the arm connected to the first attachment portion on the side opposite to the first attachment portion, and connected to the second attachment portion and the second attachment portion. A straight line passing through the rotation center on the opposite side of the second attachment portion of the arm intersects in plan view.
The seismic isolation damper according to any one of claims 1 to 5. The seismic isolation damper according to any one of claims 1 to 6,
A base isolation system comprising a base isolation device disposed between the base isolation structure and the non-base isolation structure.

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