JP2020060238A - Base isolation device - Google Patents

Abstract

To provide a base isolation device capable of surely supporting a plurality of dampers while securing stroke even when the plurality of dampers are connected, without using special dampers.SOLUTION: A base isolation device for suppressing oscillation to an installation surface of a base isolation object, includes a first damper connected to the base isolation object at one end, a second damper connected to the installation surface at one end, and a supporting portion connected to the other end of the first damper and the other end of the second damper, supporting the first damper and the second damper to the installation surface, and moving the installation surface according to the strokes so that the stroke of the first damper and the stroke of the second damper have equal lengths.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seismic isolation device that suppresses vibrations of an object.

  In recent years, long-period ground motions (for example, huge earthquakes along the Nankai Trough) and long-period pulse ground motions caused by direct-type ground motions have occurred, and the risk of long-period large-amplitude ground motions has been pointed out. When a long-period large-amplitude earthquake motion occurs that is larger than expected, the seismic isolation technology for the building currently being constructed may not be sufficient.

  For example, when a long-period large-amplitude ground motion occurs, the seismic isolation layer of the seismic isolation structure undergoes large deformation, causing the building to collide with the retaining wall, or the impact acceleration being input to the building during the collision may damage the building. There is a risk. Further, the vibration of the long-period ground motion and the vibration of the building resonate with each other, so that response amplification may occur in the building, which may increase the shaking of the building.

  Various technologies have been proposed as measures against these supposed damages. For example, for a collision with a retaining wall of a building, there is a technique of installing a cushioning material to mitigate the impact at the time of the collision (for example, refer to Patent Document 1 and Patent Document 2).

  In addition, it is effective to install a large number of damping devices to suppress large deformation, but in that case, the damping force is too large and a large acceleration is input to the building for a small earthquake. There is. As a countermeasure technique, an oil damper that changes the damping force depending on the displacement has also been proposed (for example, see Patent Document 3).

JP, 2014-77229, A JP, 2016-199910, A JP, 2017-26095, A

  According to the technique described in Patent Document 1 or Patent Document 2, with respect to the countermeasure using the cushioning material, the collision with the retaining wall can be avoided, but the impact acceleration at the time of the collision with the cushioning material is in the building. Will be entered. Moreover, after the collision, it is necessary to replace the crushed cushioning material.

  According to the technique described in Patent Document 3, the stroke of the oil damper device itself depending on the displacement is 1000 [mm] or less at the maximum, and it may not be applicable to a design in which the clearance is larger than 1 [m]. The maximum speed that the damper can handle is limited to 150 [cm] / s, and the damper itself may be damaged if an unexpectedly large earthquake occurs.

  However, in order to secure a stroke against the shaking of the building in order to solve these problems, for example, if a device in which two ordinary oil dampers are connected in series is used, the length of the main body becomes long and the self-weight of the damper is increased. Due to the vertical load and the axial load of the damper, the piston rod is bent and the oil damper is apt to buckle.

  The present invention has been made in view of the above-described problems, and is capable of reliably supporting a plurality of dampers while ensuring a stroke even if a plurality of dampers are connected without using a special damper. The purpose is to provide a seismic device.

  In order to achieve the above-mentioned object, the present invention is a seismic isolation device that suppresses swaying of an installation surface of a seismic isolation target object, one end of which is connected to the seismic isolation target object and the other end of which is A second damper connected to the installation surface, the other end of the first damper and the other end of the second damper, and supports the first damper and the second damper with respect to the installation surface. In addition, the seismic isolation device is provided with: a support portion that moves the installation surface according to the stroke so that the stroke of the first damper and the stroke of the second damper have the same length.

  According to the present invention, since the first damper and the second damper are connected via the support portion, it is possible to prevent the dampers from bending due to their own weight and buckling during expansion and contraction. In addition, since the support portion has the same length of stroke as the first damper and the second damper during expansion and contraction, it is possible to expand and contract each damper at the same time even if there is variation in each damper.

  Further, the seismic isolation apparatus according to the present invention is configured such that the support portion moves on the installation surface while maintaining a position of a midpoint between the support member of the first damper and the support member of the second damper. It may have been done.

  According to the present invention, when the support part is expanded and contracted, the support part moves so as to hold the midpoint position between the first damper and the second damper, whereby the strokes of the respective dampers can be made equal in length. Drift and residual displacement can be prevented.

  Further, in the seismic isolation apparatus according to the present invention, the support portion includes a first shaft having one end connected to the seismic isolation target, a second shaft having one end connected to the installation surface, and the first shaft. It may be configured to include a pinion gear that meshes with a first rack gear formed on the second shaft and a second rack gear formed on the second shaft, and a mount that rotatably supports the pinion gear.

  According to the present invention, the pinion gear that meshes with the first rack gear and the second rack gear rotates to move the first rack gear and the second rack gear relatively equidistantly. By making the movement amounts equal, the strokes of the first damper and the second damper can be maintained at the same length.

  Further, in the seismic isolation apparatus according to the present invention, the other end of the first shaft is slidably connected to the second shaft, and the other end of the second shaft is connected to the first shaft. It may be configured to be slidably coupled.

  According to the present invention, the first shaft and the second shaft can relatively expand and contract while maintaining the mutual distance.

  Further, the seismic isolation apparatus according to the present invention may be configured such that the other end of the first damper and the other end of the second damper are connected to the gantry.

  According to the present invention, since the weight of each damper is supported by the gantry, the vertical bending of each damper can be prevented.

  Moreover, the seismic isolation apparatus according to the present invention may be configured to include a plurality of the first dampers and a plurality of the second dampers in the same number as the first dampers.

  According to the present invention, it is possible to easily increase the number of dampers to be installed to enhance the damping force, and it is possible to cope with a larger swing.

  Further, the seismic isolation apparatus according to the present invention may be configured to include a moving mechanism that supports the support portion so as to be movable in a plane direction parallel to the installation surface.

  According to the present invention, since the supporting unit includes the moving mechanism, the supporting unit can be moved in the plane direction parallel to the installation surface, and it is possible to deal with complicated shaking of the installation surface with respect to the seismic isolation target.

  Moreover, the seismic isolation apparatus according to the present invention may be configured to include a moving mechanism in which the moving mechanisms slide in directions orthogonal to each other.

  According to the present invention, by providing the moving mechanism in which the support portions slide in the directions orthogonal to each other, it is possible to move the support portions in the plane direction parallel to the installation surface.

  Moreover, the seismic isolation apparatus according to the present invention may be configured such that the moving mechanism includes a plurality of balls that support the support portion.

  According to the present invention, since the support portion is supported by the plurality of balls, the support portion can be moved in the plane direction parallel to the installation surface.

  According to the seismic isolation apparatus of the present invention, it is possible to reliably support a plurality of dampers while ensuring a stroke even if a plurality of dampers are connected without using a special damper.

It is a conceptual diagram which shows the structure of the seismic isolation apparatus of embodiment of this invention typically. It is a side view which shows the structure of the support part of a seismic isolation apparatus. It is a top view which shows the structure of a support part. It is sectional drawing which shows the structure of a link mechanism. It is a top view which shows operation | movement of the support part by a link mechanism. It is a figure which shows roughly operation | movement of a support part when an installation surface and a base-isolation target object are relatively displaced. It is a figure which shows the structure of the seismic isolation apparatus in which two dampers were juxtaposed. It is a figure which shows the modification of a structure of the seismic isolation apparatus by which two dampers were juxtaposed. It is a figure which shows the modification of a structure of the seismic isolation apparatus by which four dampers were juxtaposed. It is a perspective view showing composition of a stand of a seismic isolation device in which four dampers were arranged side by side. It is a figure which shows the modification of the base isolation device which supports a moving mechanism with a ball roller.

  Hereinafter, an embodiment of a seismic isolation device of the present invention will be described with reference to the drawings.

  As illustrated in FIG. 1, for example, the seismic isolation device 1 is a device that suppresses the shaking of the installation surface E that the seismic isolation target 2 receives. The seismic isolation target 2 is, for example, a seismic isolated upper structure such as a building, and the installation surface E is, for example, a seismic isolated lower structure of a ground surface or a floor surface. The seismic isolation device 1 is provided, for example, at the foundation of a building. The seismic isolation target 2 is supported on the installation surface E via a seismic isolation layer 3. The seismic isolation layer 3 is formed, for example, by alternately laminating plate-shaped members made of an elastic material such as rubber and iron plates.

  When an earthquake occurs, the installation surface E is displaced, but the seismic isolation target 2 tries to stay on the spot due to inertia. The seismic isolation layer 3 flexibly supports the seismic isolation target object 2 with respect to the installation surface E. Therefore, when the earthquake occurs, the seismic isolation layer 3 expands and contracts with respect to the displacement of the installation surface E. The shaking of the installation surface E is prevented from directly propagating.

  However, when a long-period large-amplitude earthquake motion occurs, the seismic isolation layer 3 alone may not be able to perform seismic isolation, so the seismic isolation device 1 is provided between the seismic isolation target 2 and the installation surface E. The seismic isolation apparatus 1 includes a seismic isolation unit D for damping the shaking of the seismic isolation target 2, and a support unit 30 that supports the seismic isolation unit D with respect to the installation surface E.

  The seismic isolation unit D includes, for example, a pair of a first damper 10 and a second damper 20. The first damper 10 and the second damper 20 are, for example, general oil dampers. The first damper 10 and the second damper 20 are connected in series so as to make the damping force of one damper equal while securing a necessary stroke amount for shaking. The first damper 10 includes a cylindrical main body portion 11 and a cylindrical piston rod 12 that can expand and contract from the tip of the main body portion 11.

  One end 12A of the first damper 10 is, for example, the tip of the piston rod 12, and is connected to the pedestal 4 provided so as to hang down from the lower surface of the seismic isolation target 2. A through hole is provided at one end 12A of the first damper 10, for example, and is connected to a support member (clevis) provided on the pedestal 4 that holds the through hole by pin bonding. The support member may have a pin joint rotatable about two axes or a ball joint (hereinafter the same).

  As a result, the one end 12A of the first damper 10 is rotatably supported in the horizontal plane direction with respect to the pedestal 4 within a predetermined angle range. The other end 11 </ b> A of the first damper 10 is, for example, the rear end of the main body portion 11 and is connected to the support portion 30. The other end 11A of the first damper 10 is provided with, for example, a through hole, and is connected to a support member (clevis) provided in the support portion 30 that holds the through hole by pin bonding. . As a result, the other end 11A of the first damper 10 is rotatably supported in the horizontal plane direction with respect to the support portion 30 within a predetermined angle range.

  For the second damper 20, for example, the same oil damper as the first damper 10 is used. The second damper 20 is provided with a cylindrical main body portion 21 and a columnar piston rod 22 that can expand and contract from the tip of the main body portion 21. One end 22A of the second damper 20 is, for example, the tip of the piston rod 22, and is connected to the pedestal 5 provided so as to project upward from the installation surface E. The one end 22A of the second damper 20 is provided with, for example, a through hole, and is connected to a support member (clevis) provided on the pedestal 5 that holds the through hole by pin bonding. As a result, the one end 22A of the second damper 20 is rotatably supported in the horizontal plane direction with respect to the pedestal 5 within a predetermined angle range.

  The other end 21A of the second damper 20 is, for example, the rear end of the main body portion 21 and is connected to the support portion 30. The other end 21A of the second damper 20 is provided with, for example, a through hole, and is connected to a support member provided in a support portion 30 that holds the through hole by pin bonding. As a result, the other end 21A of the second damper 20 is rotatably supported by the support portion 30 in the horizontal plane direction within a predetermined angle range.

  The support portion 30 is placed on the installation surface E via a moving mechanism 31 that allows the support portion 30 to move relative to the installation surface E. The support portion 30 is connected to the other end 11A of the first damper 10 and the other end 21A of the second damper 20 to support the first damper 10 and the second damper 20 with respect to the installation surface E. . The support portion 30 prevents the first damper 10 and the second damper 20 from bending downward due to their own weight, and also prevents the first damper 10 and / or the second damper 20 from buckling during expansion and contraction.

  If only the first damper 10 and the second damper 20 are connected, when the installation surface E is displaced, a large load is applied to one of the dampers having the lower damping force due to the variation in the damping force of the damper. Therefore, when the installation surface E is displaced, the strokes of the first damper 10 and the second damper 20 become equal in length, and it is desirable that the two dampers expand and contract at the same time. Therefore, the support portion 30 is provided with a link mechanism 35 for making the strokes of the first damper 10 and the second damper 20 equal when the installation surface E is displaced. The first damper 10 and the second damper 20 may be juxtaposed as described later.

  As shown in FIGS. 2 and 3, the support portion 30 includes a pedestal 40 on which a link mechanism 35 is provided. The gantry 40 is supported by the moving mechanism 31. The moving mechanism 31 is, for example, a cross linear bearing, and the moving mechanism 31 is, for example, a pair of first linear units that move the gantry 40 along the stroke direction (Y-axis direction) of the first damper 10 and the second damper 20. The bearing 32 and a pair of second linear bearings 33 that move the gantry 40 in a direction (X-axis direction) orthogonal to the first linear bearing 32 are provided. The first linear bearing 32 includes a rail 32A installed on the installation surface E and a sliding portion 32B that slides on the rail 32A.

  The second linear bearing 33 includes a rail 33A installed in a direction orthogonal to the first linear bearing 32, and a sliding portion 33B that supports the first linear bearing 32 and slides on the rail 33A.

  With such a configuration, the first linear bearing 32 supports the second linear bearing 33. The second linear bearing 33 supports the gantry 40.

  The gantry 40 is supported on the installation surface E by the moving mechanism 31 so as to be movable in two directions of the X axis direction and the Y axis direction. The gantry 40 includes a bottom plate 40A that is a rectangular plate-shaped body supported by the moving mechanism 31, and a first support plate 40B and a second support plate that are rectangular plate-shaped bodies that are erected upward from both ends of the bottom plate 40A in the Y-axis direction. 40C. The first support plate 40B is provided with a rectangular through hole H1 through which the first shaft 36 penetrates and a rectangular through hole H2 through which the piston rod 12 of the first damper 10 penetrates as described later. ing. The second support plate 40C has a rectangular through hole (not shown) through which the second shaft 37 passes, and a rectangular through hole (not shown) through which the piston rod 22 of the second damper 20 passes, as described later. Are shown).

  A link mechanism 35 is provided on the gantry 40. The link mechanism 35 relatively moves, for example, the first shaft 36 penetrating the first support plate 40B, the second shaft 37 penetrating the second support plate 40C, and the first shaft 36 and the second shaft 37. And a pinion gear 38 for causing the pinion gear 38 to move.

  The first shaft 36 is, for example, a steel rod having a rectangular cross section. The cross section of the first shaft 36 may be circular. A tip portion 36A of the first shaft 36 is connected to a support member 4A such as a clevis provided on the pedestal 4 by a pin joint so as to be rotatable in a horizontal plane direction within a predetermined angle range. A stopper 36C is fixed to the rear end portion 36B of the first shaft 36. The stopper 36C has a sectional shape that holds the first shaft 36 and the second shaft 37 (see FIG. 4).

  The second shaft 37 penetrates through the stopper 36C. The stopper 36C slidably supports the second shaft 37 so that the second shaft 37 is separated from the first shaft 36 by a predetermined distance. A first rack gear 36D is formed on a surface of the first shaft 36 between the front end portion 36A and the rear end portion 36B, which faces the second shaft 37.

  The second shaft 37 is, for example, a steel rod having a square cross section. The cross section of the second shaft 37 may be circular. A tip portion 37A of the second shaft 37 is connected to a support member 5A such as a clevis provided on the pedestal 5 by a pin joint so as to be rotatable in a horizontal plane direction within a predetermined angle range. A stopper 37C is fixed to the rear end portion 37B of the second shaft 37. The stopper 37C has a cross-sectional shape that holds the first shaft 36 and the second shaft 37 (see FIG. 4).

  The first shaft 36 passes through the stopper 37C. The stopper 37C slidably supports the first shaft 36 so that the first shaft 36 is separated from the second shaft 37 by a predetermined distance. Thus, the presence of the stopper 36C and the stopper 37C allows the first shaft 36 and the second shaft 37 to relatively expand and contract. A second rack gear 37D is formed on the surface of the second shaft 37 between the front end portion 37A and the rear end portion 37B that faces the first shaft 36.

  A pinion gear 38 is arranged between the first shaft 36 and the second shaft 37 so as to mesh with the first rack gear 36D and the second rack gear 37D. The pinion gear 38 is rotatably supported by a pedestal 39 provided on the bottom plate 40A. The pinion gear 38 is arranged, for example, at a center point between the support member 4A of the first shaft 36 and the support member 5A of the second shaft 37.

  As shown in FIG. 5, when displacement occurs such that the pedestal 4 and the pedestal 5 are separated from each other, the first shaft 36 and the second shaft 37 relatively extend while maintaining their parallelism. At this time, by rotating the pinion gear 38, the first rack gear 36D and the second rack gear 37D are relatively displaced in the same length. That is, the pinion gear 38 equalizes the strokes of the first shaft 36 and the second shaft 37 with respect to the position of the pinion gear 38. Similarly, when a displacement such that the pedestal 4 and the pedestal 5 are close to each other occurs, the pinion gear 38 also makes the strokes of the first shaft 36 and the second shaft 37 with respect to their own positions equal length.

  As shown in FIG. 6, when the installation surface E and the seismic isolation target 2 are relatively displaced, the support part 30 moves on the installation surface E. As shown in FIG. 6 (1), the pedestal 5 provided on the installation surface E is provided on the seismic isolation target 2 as shown in FIG. 6 (2) from the normal state in which no displacement occurs. When the installation surface E is displaced in the direction away from the pedestal 4, the first shaft 36 and the second shaft 37 relatively expand. At this time, the pinion gear 38 rotates and the pinion gear 38 also displaces relative to the installation surface E.

  When the pinion gear 38 is displaced, a force propagates in the displacement direction to the pedestal 39 via the rotation shaft (not shown) of the pinion gear 38, and the pedestal 39 is also displaced in association with the pinion gear 38. When the pedestal 39 is displaced, the gantry 40 is also interlocked and moves with respect to the installation surface E. The amount of movement of the gantry 40 with respect to the installation surface E is interlocked with the rotation speed of the pinion gear 38.

  As shown in FIG. 6C, when the pedestal 5 provided on the installation surface E is displaced from the pedestal 4 provided on the seismic isolation target 2 in the proximal direction, the pedestal is similarly moved. 40 moves together with respect to the installation surface E. That is, the link mechanism 35 maintains the position of the midpoint of the pinion gear 38 provided at the midpoint between the first shaft 36 and the second shaft 37, so that the mount 40 of the gantry 40 with respect to the first shaft 36 and the second shaft 37. Hold the position.

  With such a configuration, the support portion 30 itself moves on the installation surface E in accordance with the stroke so that the strokes of the first shaft 36 and the second shaft 37 with respect to the gantry 40 are of equal length.

  As shown in FIG. 7, when the pair of first dampers 10 and the second dampers 20 cannot be connected in series due to the restriction of the space in which the seismic isolation device 1 is installed, the pair of first dampers 10 and the second dampers 10 can be connected. 20 and 20 may be juxtaposed in the gantry 40 in parallel in opposite directions. The first damper 10 and the second damper 20 are arranged, for example, on one diagonal line of the first support plate 40B.

  The pair of first damper 10 and second damper 20 are connected in a crank shape via the gantry 40, and expand and contract in the same manner as in the state of being connected in series. In the first damper 10, one end 12A is connected to a support member 4B such as a clevis provided on the pedestal 4 by a pin joint so as to be rotatable within a predetermined angle range. The other end 11A of the first damper 10 is connected to a support member 41 such as a clevis provided on the second support plate 40C by a pin joint so as to be rotatable within a predetermined angle range. The piston rod 12 penetrates the first support plate 40B.

  In the second damper 20, one end 22A is connected to a support member 5B such as a clevis provided on the pedestal 5 by a pin joint so as to be rotatable within a predetermined angle range. The other end 21A of the second damper 20 is connected to a support member 42 such as a clevis provided on the first support plate 40B by a pin joint so as to be rotatable within a predetermined angle range. The piston rod 12 penetrates the second support plate 40C. The pinion gear 38 is arranged, for example, at a midpoint between the support member 41 of the first damper 10 and the support member 42 of the second damper 20.

  In the seismic isolation device 1, when the installation surface E is displaced in a direction in which the pedestal 5 provided on the installation surface E is separated from or close to the pedestal 4 provided on the seismic isolation target 2, the link of the support portion 30 described above. By the operation of the mechanism 35, the support portion 30 itself moves on the installation surface E in accordance with the stroke so that the strokes of the first shaft 36 and the second shaft 37 with respect to the gantry 40 are equal in length.

  At this time, the piston rod 12 of the first damper 10 extends or shortens at the same distance as the stroke of the first shaft 36 with respect to the gantry 40. Similarly, the piston rod 22 of the second damper 20 extends or contracts at the same distance as the stroke of the second shaft 37 with respect to the mount 40. Therefore, the support portion 30 operates by the operation of the link mechanism 35 so that the strokes of the first damper 10 and the second damper 20 are made equal to each other in accordance with the strokes. The device itself moves on the installation surface E while maintaining the position of the midpoint (see FIG. 6).

  As described above, the seismic isolation device 1 can always make the displacements of the first damper 10 and the second damper 20 the same by the operation of the link mechanism 35, so that the damping characteristics and the inertial mass of the dampers are not varied. Even if there is, it is possible to prevent piston drift (lateral displacement) and residual displacement after expansion and contraction. The axial force acting on the first rack gear 36D and the second rack gear 37D is due to the difference (variation) in the damping characteristics and inertial mass of the dampers, so the difference is slight. The variation of each damper is, for example, 10% or less of the damper performance.

  When the seismic isolation device 1 is installed in the building, if the support part 30 is assembled in the factory in advance, it suffices to install each damper on the support part 30 at the site, and shorten the construction period at the site. It is possible to cope with large-amplitude and high-speed shaking of a building (twice as much as a single damper). According to the seismic isolation device 1, by connecting the oil dampers in series, the same damping force is provided while ensuring a stroke twice that of the normal oil damper, and it is a device that can handle the input speed of the normal oil damper. It can be applied when designing a building with a large clearance.

  Hereinafter, modified examples of the seismic isolation device 1 will be described. In the following description, the same names and reference numerals will be used for the same configurations as those described above, and redundant description will be appropriately omitted.

[Modification 1]
In the seismic isolation device 1 described above, the arrangement positions of the first damper 10 and the second damper 20 may be changed as appropriate.

  As shown in FIG. 8, in the seismic isolation device 1A according to the first modification, the first damper 10 and the second damper 20 may be arranged in a horizontal row with respect to the installation surface E. In the seismic isolation device 1A, when the heights of the first support plate 40B and the second support plate 40C are formed lower than the positions of the bottom surfaces of the stoppers 36C and 37C, and the first damper 10 and the second damper 20 are shortened, You may make it the stoppers 36C and 37C get over the 1st support plate 40B and the 2nd support plate 40C. According to the seismic isolation device 1A, the total height can be reduced as compared with the seismic isolation device 1.

[Modification 2]
As shown in FIG. 9, the seismic isolation device 1A of Modification 1 may be expanded to configure a seismic isolation device 1B that includes a plurality of (four or more even) dampers. The seismic isolation device 1B includes, for example, a pair of first dampers 10 arranged in parallel, and a pair of second dampers arranged in parallel opposite to the pair of first dampers 10 with the pair of first dampers 10 interposed therebetween. And 20.

  As shown in FIG. 10, in the gantry 40, the second support plate 40C is formed with a cutout portion 40D so that the pair of second dampers 20 are arranged close to the bottom plate 40A. Further, the first support plate 40B is formed with a width narrower than the width of the bottom plate 40A so that the pair of second dampers 20 are arranged close to the bottom plate 40A. The arrangement of the four dampers may be applied to the seismic isolation device 1. In this case, four dampers are arranged on the diagonal lines of the first support plate 40B and the second support plate 40C. According to the seismic isolation device 1B, the damping force can be increased as compared with the seismic isolation devices 1 and 1B by including the plurality of dampers including the first dampers 10 and the same number of the second dampers 20.

[Modification 3]
As shown in FIG. 11, the moving mechanism 31 of the seismic isolation apparatus 1 may use a ball roller supported by steel balls instead of the cross linear bearing. By using a ball roller for the moving mechanism 31, the support portion 30 can be moved freely on the installation surface E while simplifying the structure. The ball roller may be applied to the seismic isolation devices 1B and 1C.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned one embodiment and can be appropriately modified without departing from the spirit thereof. For example, not only an oil damper but also a viscous damper, an inertial mass damper, or the like may be used as the damper of the seismic isolation device so as to be compatible with an axial resistance type vibration control device. Further, the seismic isolation device 1 may be provided not only in the foundation portion of the building but also inside a structure or inside the device, and may be applied to seismic isolation of objects other than the building. Further, the seismic isolation device 1 may be not only a newly installed device but also a device that replaces or is added to an existing seismic isolation device.

1, 1A, 1B, 1C ... Seismic isolation device, 2 ... Seismic isolation object, 3 ... Seismic isolation layer, 4 ... Pedestal, 4A, 4B ... Support member, 5 ... Pedestal, 5A, 5B ... Support member, 10 ... DESCRIPTION OF SYMBOLS 1 damper, 11 ... Main body part, 11A ... Other end, 12 ... Piston rod, 12A ... One end, 20 ... Second damper, 21 ... Main body part, 21A ... Other end, 22 ... Piston rod, 22A ... One end, 30 ... Support Part, 31 ... Moving mechanism, 32 ... First linear bearing, 32A ... Rail, 32B ... Sliding part, 33 ... Second linear bearing, 33A ... Rail, 33B ... Sliding part, 35 ... Link mechanism, 36 ... First Shaft, 36A ... Tip, 36B ... Rear end, 36C ... Stopper, 36D ... First rack gear, 37 ... Second shaft, 37A ... Tip, 37B ... Rear end, 37C ... Stopper, 37D ... Second rack gear, 38 ... Pinion gear 39 ... Pedestal, 40 ... Frame, 40A ... Bottom plate, 40B ... 1st support plate, 40C ... 2nd support plate, 40D ... Notch part, 41 ... Support member, 42 ... Support member, D ... Seismic isolation part, E ... Installation surface, H1 ... through hole, H2 ... through hole

Claims (9)

A seismic isolation device that suppresses shaking of the installation surface of the seismic isolation target,
A first damper having one end connected to the seismic isolation target;
A second damper having one end connected to the installation surface;
The other end of the first damper and the other end of the second damper are connected to support the first damper and the second damper with respect to the installation surface, and the stroke of the first damper and the first damper. And a support unit that moves the installation surface according to the stroke so that the stroke of the two dampers has the same length,
Seismic isolation device. The support unit moves on the installation surface while maintaining a midpoint position between the support member of the first damper and the support member of the second damper.
The seismic isolation device according to claim 1. The support portion is
A first shaft having one end connected to the seismic isolation target, and a second shaft having one end connected to the installation surface,
A pinion gear that meshes with a first rack gear formed on the first shaft and a second rack gear formed on the second shaft;
A mount for rotatably supporting the pinion gear,
The seismic isolation device according to claim 1. The other end of the first shaft is slidably connected to the second shaft,
The other end of the second shaft is slidably connected to the first shaft,
The seismic isolation device according to claim 3. The other end of the first damper and the other end of the second damper are connected to the mount.
The seismic isolation device according to claim 3 or 4. A plurality of the first dampers and a plurality of the second dampers in the same number as the first dampers;
The seismic isolation device according to any one of claims 1 to 5. A moving mechanism that supports the support portion so as to be movable in a plane direction parallel to the installation surface,
The seismic isolation device according to any one of claims 1 to 6. The moving mechanism includes a moving mechanism that slides in directions orthogonal to each other.
The seismic isolation device according to claim 7. The moving mechanism includes a plurality of balls that support the support portion,
The seismic isolation device according to claim 7.

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