JP7090006B2 - Seismic isolation device - Google Patents

Description

The present invention relates to a seismic isolation device that suppresses vibration received by an object.

In recent years, long-period ground motions (for example, huge earthquakes along the Nankai Trough) and long-period pulse ground motions due to direct earthquakes have occurred, and the danger of long-period large-amplitude ground motions has been pointed out. When a long-period large-amplitude seismic motion occurs that is longer than expected, there is a risk that the seismic isolation technology of the building currently under construction will not be sufficient.

For example, when a long-period ground motion occurs, the seismic isolation layer of the seismic isolation structure is greatly deformed and the building collides with the retaining wall, or the building is damaged by the impact acceleration input to the building at the time of collision. There is a risk. In addition, the vibration of the long-period ground motion resonates with the vibration of the building, which may cause a response amplification in the building and increase the shaking of the building.

Various techniques have been proposed as countermeasures against these assumed damages. For example, in the case of a collision with a retaining wall of a building, there is a technique of cushioning the impact at the time of a collision by installing a cushioning material (see, for example, Patent Document 1 and Patent Document 2).

In addition, it is effective to install a large amount of damping device in order 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 (see, for example, Patent Document 3).

Japanese Unexamined Patent Publication No. 2014-77229 Japanese Unexamined Patent Publication No. 2016-199910 Japanese Unexamined Patent Publication No. 2017-26095

According to the technique described in Patent Document 1 or Patent Document 2, the collision with the retaining wall can be avoided for the measures using the cushioning material, but the impact acceleration at the time of the collision with the cushioning material is inside the building. It will be entered. In addition, after a collision occurs, 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 the 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 if an unexpectedly large earthquake occurs, the damper itself may be damaged.

However, in order to solve these problems, in order to secure a stroke against the shaking of the building, 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 weight of the damper itself becomes large. There is a problem that the piston rod bends due to the vertical load and the axial load of the damper, and the oil damper tends to buckle.

The present invention has been made in view of the above-mentioned problems, and 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. The purpose is to provide seismic equipment.

In order to achieve the above object, the present invention is a seismic isolation device that suppresses shaking of the seismic isolation object with respect to the installation surface, with a first damper connected to the seismic isolation object at one end and the above-mentioned one end. The second damper connected to the installation surface is connected to 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. A seismic isolation device including 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 bending due to the weight of each damper and buckling during expansion and contraction. Further, since the support portion has the same stroke as the first damper and the second damper at the time of expansion and contraction, each damper can be expanded and contracted at the same time even if there are variations in each damper.

Further, in the seismic isolation device according to the present invention, the support portion is configured to move the installation surface while maintaining the position of the 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, the support portion moves so as to hold the position of the midpoint between the first damper and the second damper during expansion and contraction, so that the strokes of the respective dampers can be made equal in length, and the support portion can be made equal in length. Drift and residual displacement can be prevented.

Further, in the seismic isolation device according to the present invention, the support portion has a first shaft having one end connected to the seismic isolation object, 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 the first rack gear formed in the above and the second rack gear formed on the second shaft, and a pedestal that rotatably supports the pinion gear.

According to the present invention, the pinion gear meshing with the first rack gear and the second rack gear rotates to move the first rack gear and the second rack gear relatively equidistantly, so that the first shaft and the second shaft are separated from each other. The amount of movement can be made equal, and the strokes of the first damper and the second damper can be maintained equidistant.

Further, in the seismic isolation device 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 slidably connected to the first shaft. It may be configured to be slidably connected.

According to the present invention, the first shaft and the second shaft can expand and contract relatively while maintaining a distance from each other.

Further, the seismic isolation device 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, by supporting the weight of each damper with a gantry, it is possible to prevent the vertical deflection of each damper.

Further, the seismic isolation device according to the present invention may be configured to include a plurality of the first dampers and a plurality of the second dampers having the same number as the first dampers.

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

Further, the seismic isolation device 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, by providing the support portion with a moving mechanism, the support portion can be moved in a plane direction parallel to the installation surface, and can cope with complicated shaking of the installation surface with respect to the seismic isolated object.

Further, the seismic isolation device 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 a moving mechanism in which the support portions slide in directions orthogonal to each other, it is possible to make the supports movable in a plane direction parallel to the installation surface.

Further, the seismic isolation device 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, the support portion is supported by a plurality of balls so that the support portion can be moved in a plane direction parallel to the installation surface.

According to the seismic isolation device according to 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 typically the structure of the seismic isolation device of embodiment of this invention. It is a side view which shows the structure of the support part of a seismic isolation device. It is a top view which shows the structure of the support part. It is sectional drawing which shows the structure of the link mechanism. It is a top view which shows the operation of the support part by a link mechanism. It is a figure which shows roughly the operation of the support part when the installation surface and the seismic isolation object are relatively displaced. It is a figure which shows the structure of the seismic isolation device in which two dampers are juxtaposed. It is a figure which shows the modification of the structure of the seismic isolation device in which two dampers are juxtaposed. It is a figure which shows the modification of the structure of the seismic isolation device in which four dampers are juxtaposed. It is a perspective view which shows the structure of the frame of the seismic isolation device in which four dampers are juxtaposed. It is a figure which shows the modification of the seismic isolation device which supports a moving mechanism by a ball roller.

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

As shown in FIG. 1, for example, the seismic isolation device 1 is a device that suppresses the shaking of the installation surface E received by the seismic isolation object 2. The seismic isolation object 2 is, for example, a seismic isolation superstructure of a building or the like, and the installation surface E is, for example, a seismic isolation lower structure of a ground surface or a floor surface. The seismic isolation device 1 is provided, for example, on the foundation of a building. The seismic isolation object 2 is supported by the seismic isolation layer 3 with respect to the installation surface E. The seismic isolation layer 3 is formed by alternately laminating plate-like bodies and iron plates made of an elastic body such as rubber, for example.

When an earthquake occurs, the installation surface E is displaced, whereas the seismic isolation object 2 tries to stay in place due to inertia. Since the seismic isolation layer 3 flexibly supports the seismic isolation object 2 with respect to the installation surface E, when an earthquake occurs, the seismic isolation layer 3 expands and contracts with respect to the displacement of the installation surface E, so that the seismic isolation layer 3 becomes the seismic isolation object 2. Prevents the shaking of the installation surface E from propagating directly.

However, when a long-period ground motion occurs, there is a risk that seismic isolation cannot be achieved with the seismic isolation layer 3 alone, so a seismic isolation device 1 is provided between the seismic isolation object 2 and the installation surface E. The seismic isolation device 1 includes a seismic isolation portion D for attenuating the shaking of the seismic isolation object 2, and a support portion 30 that supports the seismic isolation portion 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 in order to make the damping force of one damper equal to that of one damper while ensuring 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 be expanded and contracted 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 a pedestal 4 provided so as to hang down from the lower surface of the seismic isolation object 2. One end 12A of the first damper 10 is provided with, for example, a through hole, and is connected to a support member (clevis) provided on a pedestal 4 that supports the first damper 10 so as to sandwich the through hole by pin joining. The support member may have a pin joint that is rotatable around two axes, or may be a ball joint (hereinafter, the same applies).

As a result, one end 12A of the first damper 10 is rotatably supported in the horizontal plane direction in a predetermined angle range with respect to the pedestal 4. The other end 11A 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 supports the first damper 10 so as to sandwich the through hole by pin joining. .. 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 in a predetermined angle range.

As 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 cylindrical piston rod 22 that can be expanded and contracted 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 a pedestal 5 provided so as to project upward from the installation surface E. 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 a pedestal 5 that supports the second damper 20 so as to sandwich the through hole by pin joining. As a result, one end 22A of the second damper 20 is rotatably supported in the horizontal plane direction in a predetermined angle range with respect to the pedestal 5.

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 the support portion 30 that supports the second damper 20 so as to sandwich the through hole by pin joining. As a result, the other end 21A of the second damper 20 is rotatably supported in a predetermined angle range in the horizontal plane direction with respect to the support portion 30.

The support portion 30 is mounted on the installation surface E via a moving mechanism 31 that makes itself movable with respect to the installation surface E. The support portion 30 supports the first damper 10 and the second damper 20 with respect to the installation surface E by being connected to the other end 11A of the first damper 10 and the other end 21A of the second damper 20. .. 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 the first damper 10 and the second damper 20 are simply 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 dampers. Therefore, when the installation surface E is displaced, it is desirable that the strokes of the first damper 10 and the second damper 20 have the same length, and 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 in length 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 gantry 40 provided with a link mechanism 35. 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 moving the gantry 40 along the stroke direction (Y-axis direction) of the first damper 10 and the second damper 20. A bearing 32 and a pair of second linear bearings 33 for moving 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 sliding on the rail 32A.

The second linear bearing 33 includes a rail 33A installed in the 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 movably supported on the installation surface E by the moving mechanism 31 in two directions, the X-axis direction and the Y-axis direction. The gantry 40 includes a rectangular plate-shaped bottom plate 40A supported by the moving mechanism 31, and a rectangular plate-shaped first support plate 40B and a second support plate that stand upward from both ends of the bottom plate 40A in the Y-axis direction. It is equipped with 40C. The first support plate 40B is formed with a rectangular through hole H1 for the first shaft 36 to penetrate and a rectangular through hole H2 for the piston rod 12 of the first damper 10 to penetrate as described later. ing. The second support plate 40C has a rectangular through hole (not shown) for the second shaft 37 to penetrate and a rectangular through hole (not shown) for the piston rod 22 of the second damper 20 to penetrate as described later. (Illustrated) and are formed.

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. It is provided with a pinion gear 38 for making the pinion gear 38.

The first shaft 36 is, for example, a steel rod having a square cross section. The cross section of the first shaft 36 may be circular. The 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 pin joining so as to be rotatable in the 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 cross-sectional shape that holds the first shaft 36 and the second shaft 37 (see FIG. 4).

The second shaft 37 penetrates the stopper 36C. The stopper 36C slidably supports the second shaft 37 so that the distance from the first shaft 36 is separated by a predetermined distance. The first rack gear 36D is formed on the surface of the first shaft 36 between the front end portion 36A and the rear end portion 36B facing 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. The 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 pin joining so as to be rotatable in the 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 penetrates the stopper 37C. The stopper 37C slidably supports the first shaft 36 so that the distance from the second shaft 37 is separated by a predetermined distance. As described above, the presence of the stopper 36C and the stopper 37C makes the first shaft 36 and the second shaft 37 relatively expandable and contractible. A second rack gear 37D is formed on the surface of the second shaft 37 facing the first shaft 36 between the tip portion 37A and the rear end portion 37B.

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 position at a midpoint 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 a displacement such that the pedestal 4 and the pedestal 5 are separated from each other occurs, the first shaft 36 and the second shaft 37 extend relatively while maintaining parallelism. At this time, the rotation of the pinion gear 38 causes the first rack gear 36D and the second rack gear 37D to be relatively displaced to the same length. That is, the pinion gear 38 makes the strokes of the first shaft 36 and the second shaft 37 equal to each other with respect to the position of the pinion gear 38. Similarly, when a displacement such that the pedestal 4 and the pedestal 5 are proximal to each other occurs, the pinion gear 38 makes the strokes of the first shaft 36 and the second shaft 37 equal to each other with respect to the position thereof.

As shown in FIG. 6, when the installation surface E and the seismic isolation object 2 are relatively displaced, the support portion 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 object 2 as shown in FIG. 6 (2) from the normal state where no displacement occurs. When the installation surface E is displaced in a direction away from the pedestal 4, the first shaft 36 and the second shaft 37 extend relatively. At this time, as the pinion gear 38 rotates, the pinion gear 38 also displaces relative to the installation surface E.

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

As shown in FIG. 6 (3), when the pedestal 5 provided on the installation surface E is displaced in the direction proximal to the pedestal 4 provided on the seismic isolation object 2, the pedestal is similarly displaced. 40 moves in conjunction with the installation surface E. That is, the link mechanism 35 holds 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 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 the installation surface E according to 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.

As shown in FIG. 7, when the pair of the first damper 10 and the second damper 20 cannot be connected in series due to the limitation of the space where the seismic isolation device 1 is installed, the pair of the first damper 10 and the second damper 20 are 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 of the first support plate 40B.

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

In the second damper 20, one end 22A is rotatably connected to a support member 5B such as a clevis provided on the pedestal 5 by a pin joint within a predetermined angle range. In the second damper 20, the other end 21A is rotatably connected to a support member 42 such as a clevis provided on the first support plate 40B by pin joining in 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 proximal to the pedestal 4 provided on the seismic isolation object 2, the link of the support portion 30 described above is performed. By the operation of the mechanism 35, the support portion 30 itself moves on the installation surface E according to 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 shortens equidistantly from the stroke of the second shaft 37 with respect to the gantry 40. Therefore, the support portion 30 receives the first damper 10 and the second damper 20 according to the stroke so that the strokes of the first damper 10 and the second damper 20 have the same length due to the operation of the link mechanism 35. It itself moves on the installation surface E while maintaining the position of the midpoint (see FIG. 6).

As described above, in the seismic isolation device 1, the displacements of the first damper 10 and the second damper 20 can always be the same by the operation of the link mechanism 35, and the damping characteristics and the inertial mass of each damper vary. Even if there is, it is possible to prevent the piston from drifting (lateral displacement) and residual displacement after expansion and contraction. Since 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 the inertial mass of each damper, the difference is slight. The variation of each damper is, for example, 10% or less of the damper performance.

When installing the seismic isolation device 1 in a building, if the support portion 30 is assembled in advance at the factory, it is only necessary to install each damper on the support portion 30 at the site, shortening the construction period at the site and shortening the construction period at the site. The building can handle large amplitude and high speed shaking (twice as much as a single damper). According to the seismic isolation device 1, by connecting the oil dampers in series, the stroke is doubled that of the normal oil damper, but the damping force is the same, and the device can handle the input speed of the normal oil damper. It can be applied when designing a building with a large clearance.

Hereinafter, a modified example 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 above, and duplicate explanations will be omitted as appropriate.

[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 appropriately changed.

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, 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 when the first damper 10 and the second damper 20 are shortened, The stoppers 36C and 37C may be made to get over the first support plate 40B and the second 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 the modification 1 may be expanded to form a seismic isolation device 1B provided with a plurality of (four or more even numbers) dampers. The seismic isolation device 1B is, for example, a pair of first dampers 10 arranged in parallel and a pair of second dampers arranged in parallel in the opposite direction to the pair of first dampers 10 with the pair of first dampers 10 interposed therebetween. 20 and.

As shown in FIG. 10, in the gantry 40, the second support plate 40C is formed with a notch 40D so that the pair of second dampers 20 are arranged close to the bottom plate 40A. 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 diagonally of the first support plate 40B and the second support plate 40C. According to the seismic isolation device 1B, by providing a plurality of dampers of the first damper 10 and the same number of second dampers 20, the damping force can be enhanced as compared with the seismic isolation devices 1 and 1B.

[Modification 3]
As shown in FIG. 11, the moving mechanism 31 of the seismic isolation device 1 may use a ball roller supported by a steel ball instead of a cross linear bearing. By using a ball roller for the moving mechanism 31, the support portion 30 can be freely moved 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 of the present invention. For example, in order to be compatible with a shaft resistance type vibration control device, 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. Further, the seismic isolation device 1 may be provided not only in the foundation portion of the building but also in the inside of the structure or the inside of the device, and may be applied to the seismic isolation of an object other than the building. Further, the seismic isolation device 1 may be not only a new one but also a replacement or an additional one with 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 ... 1 damper, 11 ... main body, 11A ... other end, 12 ... piston rod, 12A ... one end, 20 ... second damper, 21 ... main body, 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 ... pedestal, 40A ... bottom plate, 40B ... first support plate, 40C ... second support plate, 40D ... notch, 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 object.
The first damper, one end of which is connected to the seismic isolated object,
A second damper with 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. (2) A support portion that moves the installation surface according to the stroke so that the stroke of the damper has the same length is provided.
Seismic isolation device. The support portion moves on the installation surface while maintaining the position of the midpoint 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 object, and a second shaft having one end connected to the installation surface.
A pinion gear that meshes with the first rack gear formed on the first shaft and the second rack gear formed on the second shaft.
A pedestal that rotatably supports the pinion gear, and the like.
The seismic isolation device according to claim 1 or 2. 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 gantry.
The seismic isolation device according to claim 3 or 4. A plurality of the first dampers and a plurality of the second dampers having the same number as the first dampers are provided.
The seismic isolation device according to any one of claims 1 to 5. A moving mechanism for supporting the support portion so as to be movable in a plane direction parallel to the installation surface is provided.
The seismic isolation device according to any one of claims 1 to 6. The moving mechanism includes a moving mechanism that slides in a direction orthogonal to each other.
The seismic isolation device according to claim 7. The moving mechanism comprises a plurality of balls that support the support.
The seismic isolation device according to claim 7.

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