JP6650299B2 - Seismic isolation device - Google Patents

Description

  The present invention is interposed between an upper structure such as a broadcast facility (a facility from a receiving point facility to a broadcast transfer point) or a building and a lower structure such as a foundation, and is provided with a lower structure caused by an earthquake, traffic vibration, or the like. The present invention relates to a seismic isolation device that reduces transmission of vibration of a structure to an upper structure, and more particularly to a seismic isolation device that suppresses a horizontal movement amount of an upper structure with respect to a lower structure.

  When installing a seismic isolation device in a broadcasting facility, the amount of movement of the upper structure relative to the lower structure in the horizontal direction is limited by the length of the cable. Generally, in order to enhance the seismic isolation performance, it is necessary to set a large amount of this movement. Therefore, it is not easy to configure a seismic isolation device having a high seismic isolation performance and a small amount of movement.

  Therefore, for example, Patent Document 1 discloses an upper steel plate fixed to an upper structure, a lower steel plate fixed to a lower structure and having an upper surface formed in a concave spherical shape, and a lower steel plate fixed to the upper steel plate. A seismic isolation device including a column member sliding on a concave spherical surface of a steel plate, a cylindrical rubber member surrounding the upper steel plate, the lower steel plate, and the column member, and a viscous body filled in a closed space formed by the cylindrical rubber member. An apparatus is disclosed.

  In the seismic isolation device of Patent Document 1, when horizontal vibration (displacement) occurs in the lower structure due to an earthquake or the like, the column member slides to transmit the vibration of the lower structure to the upper structure. Can be reduced. In addition, in this seismic isolation device, the natural period of the upper structure can be lengthened by the principle of the pendulum regardless of the load supported by the seismic isolation device. Vibration energy transmitted from the lower structure to the upper structure can be attenuated by the frictional resistance generated on the contact surface, the resistance of the viscous body to the column member, and the restoring force of the cylindrical rubber member. Thereby, the amount of movement of the upper structure in the horizontal direction with respect to the lower structure can be reduced.

JP-A-11-294529

  However, in the seismic isolation device described in Patent Literature 1, since the cross-sectional shape and the cross-sectional area of the column member differ for each upper structure, it is not easy to stabilize the resistance force obtained by the viscous body. In order to adjust the resistance force of the viscous body, the cross-sectional shape and cross-sectional area of the column member must be adjusted. However, when changing the cross-sectional shape and cross-sectional area of the column member, the column member must be replaced. There is also a problem that this work requires considerable labor.

  In view of the above, the present invention has been made in view of the above-described problems of the conventional seismic isolation device, and it is possible to reduce the amount of movement of the upper structure relative to the lower structure, and to achieve a stable resistance force from the viscous material. It is an object of the present invention to provide a seismic isolation device capable of obtaining the following.

To achieve the above object, a seismic isolation device of the present invention includes a spherical plate fixed to a lower structure, having a concave spherical surface on an upper surface, and containing a viscous material in the concave spherical surface, and the concave spherical surface of the spherical plate. A space between the spacer that slides on the surface and the concave spherical surface of the spherical plate with the spacer interposed therebetween, and at least the viscous body is filled in the space. A resistance plate that moves with the spacer, a movable body fixed to the upper structure at the upper surface, and a lower surface fixed to the spherical plate at the lower surface, and the concave spherical surface of the spherical plate fixed to the spherical plate. And a covering cover .

ADVANTAGE OF THE INVENTION According to this invention, since the cross-sectional shape and a cross-sectional area do not participate in generation | occurrence | production of a resistance, the resistance obtained by a viscous body can be stabilized. Further, by changing the surface area of the lower surface of the resistance plate and the gap between the resistance plate and the surface of the concave spherical surface, the shear resistance force for attenuating vibration energy transmitted from the lower structure to the upper structure is changed. Therefore, it is not necessary to perform a large-scale operation of replacing the column member as in the related art, and it is only necessary to replace the resistance plate and the spacer. Furthermore, since the lower surface of the movable body is movably installed on the resistance plate, the lower structure is horizontally displaced by an earthquake or the like, and the inclination of the upper structure when the spacer slides on the surface of the concave spherical surface can be suppressed. it can. Further, the seismic isolation device is provided with a cover fixed to the spherical plate and covering the concave spherical surface of the spherical plate, thereby preventing rainwater or the like from entering the housing space of the viscous body above the spherical plate. be able to.

  In the seismic isolation device, a connecting portion fixed to an upper surface of the resistance plate and having a convex spherical surface on an upper surface is provided, and a concave spherical surface that contacts the convex spherical surface of the connecting portion is provided on a lower surface of the movable body. When the convex spherical surface of the portion and the concave spherical surface of the movable body slide with each other, the movable body can be rotatably slidably in contact with the resistance plate.

  Further, in the seismic isolation device, a connecting portion fixed to the upper surface of the resistance plate and having a concave spherical surface on the upper surface is provided, and the movable body is provided on the lower surface with a convex spherical surface that contacts the concave spherical surface of the connecting portion, When the concave spherical surface of the connecting portion slides on the convex spherical surface of the movable body, the movable body can be rotatably slidably in contact with the resistance plate.

  Further, in the seismic isolation device, an elastic body is provided between an upper surface of the resistance plate and a lower surface of the movable body, and the movable body is rotatably connected to the resistance plate by elastically deforming the elastic body. It can also be configured to be performed.

  In the seismic isolation device, when the movable body moves together with the resistance plate, the movable body moves in a direction away from a center of the concave spherical surface of the spherical plate by a predetermined distance or more. Can be provided. Thus, excessive displacement of the resistance plate can be prevented.

  Further, in the seismic isolation device, the movable body is formed in a columnar or rectangular column shape, and the stopper or the cover has a circular or rectangular opening in a top view for accommodating the movable body and forms the opening. It can be configured to have a ridge projecting upward at the edge. The protrusion formed on the edge of the stopper or the cover can prevent rainwater located on the upper surface of the stopper or the like from entering the accommodating space of the viscous body above the spherical plate.

  Further, the seismic isolation device may be provided with a plate-shaped cover fixed to the movable body and having a ridge projecting downward at a circular or rectangular outer edge viewed from above, which covers the concave spherical surface of the spherical plate. The ridges formed at the edge of the cover can prevent rainwater on the upper surface of the cover from flowing to the lower surface.

  The seismic isolation device may be configured to further include separation preventing means for preventing the resistance plate and the movable body from being separated from each other in a vertical direction. When the aspect ratio of the upper structure is high, the upper structure swings greatly in the vertical direction and lifts up, and the pulling force acts on the movable body. However, the separation prevention means prevents the separation between the resistance plate and the movable body Therefore, it is possible to prevent the movable body from dropping off from the connecting portion and to prevent the elastic body interposed between the resistance plate and the movable body from being damaged.

  As described above, according to the present invention, it is possible to provide a seismic isolation device that can reduce the amount of movement of an upper structure with respect to a lower structure and can obtain a stable resistance from a viscous body. it can.

1A and 1B show an embodiment of a seismic isolation device according to the present invention, in which FIG. 1A is a top view, and FIG. FIG. 2 is a cross-sectional view showing a state where horizontal force is applied to a spherical plate of the seismic isolation device shown in FIG. 1 by an earthquake or the like. 2A and 2B show an installation example of the seismic isolation device shown in FIG. 1, wherein FIG. 1A is a transparent top view, and FIG. It is a partial expanded sectional view showing a 2nd embodiment of a seismic isolation device concerning the present invention. It is a partial expanded sectional view showing a 3rd embodiment of a seismic isolation device concerning the present invention. It is a partial expanded sectional view showing a 4th embodiment of a seismic isolation device concerning the present invention.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a seismic isolation device according to the present invention. The seismic isolation device 1 includes a spherical plate 2 having a lower surface 2b fixed to a lower structure and having a concave spherical surface 2a on an upper surface; The cylindrical member 3 erected on the spherical plate 2 so as to surround the two concave spherical surfaces 2a, the viscous body 5 accommodated in the concave spherical surface 2a, and the lower surface 6d are substantially the same as the concave spherical surface 2a of the spherical plate 2 And a resistance plate 6 having a convex spherical connection portion 6a on the upper surface 6c and a lower surface 6d of the resistance plate 6, and sliding on the concave spherical surface 2a of the spherical plate 2. It comprises a moving spacer 7, a movable body 8 and the like, whose upper surface 8c is fixed to the upper structure, and whose lower surface (concave sphere) 8d contacts the convex sphere 6b of the connecting portion 6a of the resistance plate 6.

  The spherical plate 2 is formed of a metal material such as a carbon steel plate, a stainless steel plate, and an aluminum plate into a square shape in a top view, and the surface is coated with a sliding material in some cases. Four through holes 2c for inserting bolts for fixing the spherical plate 2 to the lower structure are formed outside the cylindrical member 3 surrounding the concave spherical surface 2a having a circular shape in a top view.

  The cylindrical member 3 is formed of a carbon steel plate, a stainless steel plate, an aluminum plate, or the like in a circular shape when viewed from above, and is provided to prevent the viscous body 5 from leaking to the outside from the concave spherical surface 2a and to mount a stopper 10 on an upper portion. Can be

  The viscous material 5 can be appropriately selected from generally used silicone oil, high-viscosity polymer such as polyisobutylene, polypropylene, polybutene or dimethylpolysiloxane having high viscosity, or asphalt.

  The resistance plate 6 is formed from a carbon steel plate, a stainless steel plate, an aluminum plate, or the like into a circular shape when viewed from the top, and includes a connection portion 6a having a convex spherical shape (a convex spherical surface 6b) at an upper portion. The connecting portion 6a is fixed to the upper surface 6c of the resistance plate 6 by welding, bolts, or the like. The convex spherical connecting portion 6a and the resistance plate 6 may be integrally formed by machining a solid material.

  The spacer 7 is formed in a circular ring shape as viewed from above using a metal material such as a carbon steel plate, a stainless steel plate, and an aluminum plate, and is fixed to the lower surface 6 d of the resistance plate 6 by welding, bolts, or the like. The spacer 7 generates a frictional resistance by sliding on the concave spherical surface 2 a of the spherical plate 2 and forms a gap between the resistance plate 6 and the concave spherical surface 2 a of the spherical plate 2. The spacer 7 may be composed entirely of a sliding member having good sliding characteristics, or may be formed by covering the sliding surface of the above metal material with a sliding member having good sliding characteristics. Is also good.

  The movable body 8 is formed entirely of a carbon steel plate, a stainless steel plate, an aluminum plate, or the like, and includes a square plate-like portion 8a as viewed from above and a circular column-shaped portion 8b as viewed from above. The movable body 8 has a concave spherical surface 8d at the lower portion that comes into contact with the convex spherical surface 6b of the connecting portion 6a of the resistance plate 6. Since the concave spherical surface 8d of the cylindrical portion 8b is pressed against the convex spherical surface 6b of the connecting portion 6a of the resistance plate 6 by the load of the upper structure, the cylindrical portion 8b rotates with respect to the connecting portion 6a of the resistance plate 6. It is possible and follows the movement of the resistance plate 6. The plate-shaped portion 8a is provided with four screw holes 8e for screwing bolts when fixing the seismic isolation device 1 to the upper structure.

  The upper part of the cylindrical member 3 has a circular opening 10a at the center in the center, and a stopper 10 having a circular top view made of a carbon steel plate, a stainless steel plate, an aluminum plate, a rubber material or a resin is welded, glued or bolted. Fixed. Thereby, the horizontal displacement of the movable body 8 and the resistance plate 6 is limited. The stopper 10 has an annular ridge 10b at an inner edge thereof, and when the seismic isolation device 1 is installed outdoors, rainwater on the upper surface of the stopper 10 infiltrates the accommodation space of the viscous body 5 above the spherical plate 2. It also has a function as a cover to prevent the operation from being performed.

  A disk-shaped cover 11 having an annular ridge 11a on an outer edge 11b is fixed to the lower surface 8f of the plate-shaped portion 8a of the movable body 8 and the upper side surface 8g of the columnar portion 8b by welding, adhesive or bolt. You. When the seismic isolation device 1 is installed in a broadcasting facility or the like installed outdoors, the annular ridge 11 a can prevent rainwater on the upper surface of the cover 11 from flowing to the lower surface of the cover 11. It is possible to prevent rainwater from entering the storage space of the viscous body 5 above the face plate 2.

  Next, the operation of the seismic isolation device 1 having the above configuration will be described in detail with reference to FIGS.

  When the spherical plate 2 is displaced to the right, for example, due to an earthquake or the like from the normal state shown in FIG. 1B, the movable body 8, the resistance plate 6, and the spacer 7 move relatively to the left as shown in FIG. Displace. Here, since the movable body 8 is rotatable with respect to the connecting portion 6a of the resistance plate 6, it moves together with the resistance plate 6 while suppressing the inclination of the upper structure.

  By the above operation, the natural period of the upper structure can be lengthened by the principle of the pendulum regardless of the load of the upper structure supported by the seismic isolation device 1, and the contact between the spacer 7 and the spherical plate 2 can be increased. Vibration energy applied to the lower structure can be attenuated by the frictional resistance generated on the surface and the resistance of the viscous body 5 to the spacer 7 and the resistance plate 6. The operation so far is substantially the same as that of the conventional seismic isolation device.

  In addition to the above, in the present embodiment, a shear resistance force can be further obtained by the viscous body 5 located between the lower surface 6d of the resistance plate 6 and the concave spherical surface 2a of the spherical plate 2 as a damping action of vibration energy. However, since this shear resistance is determined by the overlapping area of the resistance plate 6 and the spherical plate 2 when viewed from above and the gap between the lower surface 6 d of the resistance plate 6 and the concave spherical surface 2 a of the spherical plate 2, The viscous body 5 filled in the concave spherical surface 2a of the face plate 2 needs to be filled in the gap between the resistive plate 6 and the concave spherical surface 2a of the spherical plate 2 at least until it contacts the lower surface 6d of the resistance plate 6. is there. The overlapping area of the resistance plate 6 and the spherical plate 2 when viewed from above is larger, the larger the area is, the larger the resistance is, and the gap between the lower surface 6d of the resistance plate 6 and the concave spherical surface 2a of the spherical plate 2 is The smaller the resistance, the greater the resistance. In order to adjust the resistance force of the viscous body in this way, it is not necessary to perform a large-scale operation such as replacing a column member as in the related art, and it is only necessary to replace the resistance plate 6 and the spacer 7. In addition, since a column member having an indeterminate cross-sectional shape or area is not involved in generating a resistance without using a column member as in the related art, the resistance obtained by the viscous body can be stabilized.

  On the other hand, in the state of FIG. 2, although not shown, the viscous body 5 on the concave spherical surface 2 a of the spherical plate 2 is actually shifted to the left (raised) with the movement of the resistance plate 6. The stopper 10 also functions as a return for returning the viscous body 5 biased to the left to the center of the spherical plate 2.

  FIG. 3 shows an example of installation of the seismic isolation device 1 having the above configuration. In the present embodiment, the seismic isolation device 1 is installed at each of the four corners of the upper structure 21.

  The lower structure 22 and the spherical plate 2 are fixed by inserting a bolt 23 into the through hole 2 c of the spherical plate 2 and screwing the bolt 23 into a screw hole formed in the lower structure 22. The movable body 8 is fixed to the upper structure 21 via a channel steel 24 having upper and lower flange portions 24a and 24b. After the upper flange portion 24a of the channel steel 24 is fixed to the upper structure 21, the movable member 8 is fixed to the upper structure 21. The bolt 25 is inserted into a through hole formed in the lower flange portion 24b of the movable member 24, and screwed into a screw hole 8e of the movable body 8 (see FIG. 1A).

  FIG. 4 shows a second embodiment of the seismic isolation device according to the present invention. The seismic isolation device 31 is different from the movable body 8 and the resistance plate 6 of the seismic isolation device 1 shown in FIG. Only a portion corresponding to the columnar portion 8b of the movable body 8 shown in FIG. 1 is shown), a resistance plate 33, and a ring-shaped member 34 connecting these. In addition, about the same component as the seismic isolation device 1, the same reference number is attached and the description is omitted.

  The movable body 32 is formed to have a larger diameter than the connecting portion 33a of the resistance plate 33, and has a concave spherical surface 32a on the lower surface that contacts the upper surface 33b of the connecting portion 33a. Grooves 32b and 33c are formed in the movable body 32 and the connecting portion 33a, respectively, over one circumference in the horizontal direction.

  The ring-shaped member 34 has a first annular ridge 34a inserted into the groove 32b of the movable body 32 at the upper part, and a second annular ridge 34b inserted into the groove 33c of the connecting part 33a at the lower part, It is fixed to the movable body 32 by bolts 35. The ring-shaped member 34 is divided into a plurality of parts when viewed from above, and is fixed to the movable body 32.

  With the above configuration, in the event of an earthquake or the like, similarly to the seismic isolation device 1 shown in FIGS. 1 and 2, the movable body 32, the resistance plate 33, and the spacer 7 are displaced with respect to the spherical plate 2, and the movable body 32 While maintaining the rotatable state with respect to the resistance plate 33, it moves together with the resistance plate 33 while suppressing the inclination of the upper structure, lengthens the natural period of the upper structure, and reduces the vibration energy applied to the lower structure. Can be attenuated.

  In addition, when the aspect ratio of the upper structure is high or the like, the upper structure swings greatly in the vertical direction to lift up, and a pulling force acts on the movable body 32. Since the upper surface of the ridge 34b abuts on the ceiling surface of the groove 33c of the connecting portion 33a of the resistance plate 33, the movable body 32 can be prevented from falling off from the connecting portion 33a of the resistance plate 33.

  FIG. 5 shows a third embodiment of the seismic isolation device according to the present invention. The seismic isolation device 41 is different from the seismic isolation device 31 shown in FIG. And a movable body 42, a resistance plate 43, and a ring-shaped member 44. Note that the same components as those of the seismic isolation devices 1 and 31 are denoted by the same reference numerals and description thereof is omitted.

  The movable body 42 is formed to have a smaller diameter than the connecting portion 43a of the resistance plate 43, and has a concave spherical surface 42a on the lower surface that contacts the upper surface 43b of the connecting portion 43a. Grooves 42b and 43c are formed in the movable body 42 and the connecting portion 43a, respectively, over the entire circumference in the horizontal direction.

  The ring-shaped member 44 has a first annular ridge 44a inserted into the groove 42b of the movable body 42 at the upper part, and a second annular ridge 44b inserted into the groove 43c of the connecting part 43a at the lower part, It is fixed to the connecting portion 43a by a bolt 45. The ring-shaped member 44 is divided into a plurality of parts when viewed from above, and is fixed to the movable body 42.

  With the above configuration, similarly to the seismic isolation device 31 shown in FIG. 4, the movable body 42, the resistance plate 43, and the spacer 7 are displaced with respect to the spherical plate 2. While maintaining the possible state, the lower surface of the first annular ridge 44a of the ring-shaped member 44 abuts the bottom surface of the groove 42b of the movable body 42, so that the movable body 42 can be prevented from falling off.

  In the above-described embodiment, the connecting portion 6a of the resistance plate 6 is provided with a convex spherical surface 6b, and the movable member 8 is provided with a concave spherical surface 8d in contact with the convex spherical surface 6b, so that the resistance plate 6 and the movable member 8 are rotatably connected. However, even if these concavo-convex relations are reversed, both can be similarly rotatably connected.

  Further, the case where the spacer 7 is formed in a ring shape as viewed from above has been described. However, the present invention is not limited to this, and the spacer 7 can be formed in a circular column, a quadrangular column, a polygonal column, a quadrangular cylinder, or a polygonal cylinder. By providing one wide spacer or providing at least three spacers if they are narrow, the same function as the spacer 7 can be exerted in any case.

  Furthermore, although the case where the cover 11 is formed in a disk shape has been described, the present invention is not limited to this, and the cover 11 may be formed in a bellows shape that expands and contracts in the horizontal direction. Further, instead of the annular ridge 11 a provided on the lower surface of the cover 11, a goodwill-like rubber member may be provided on the side surface of the cover 11.

  Also, a case has been described where the movable body 8 is formed in a cylindrical shape (cylindrical portion 8b), the opening 10a of the stopper 10 is formed in a circular shape in a top view, and the cover 11 is formed in a circular shape in a top view. May be formed in a rectangular column shape, the opening 10a of the stopper 10 may be formed in a rectangular shape in a top view, and the cover 11 may be formed in a rectangular shape in a top view. Furthermore, by making the opening 10a of the stopper 10 a rectangular shape in a top view, the movable amount in two directions orthogonal to the horizontal direction can be made different.

  Further, it has been described that the stopper 10 also functions as a cover. However, in a case where the displacement of the resistance plate 6 is stabilized without providing the stopper 10, for example, the stopper 10 is replaced with the same shape having a lower strength than the stopper 10. A cover can be installed.

  FIG. 6 shows a fourth embodiment of a seismic isolation device according to the present invention. The seismic isolation device 51 is different from the seismic isolation device 1 shown in FIG. 52, a resistance plate 53 and an elastic body 54. In addition, about the same component as the seismic isolation device 1, the same reference number is attached and the description is omitted.

  The movable body 52 is entirely formed of a carbon steel plate, a stainless steel plate, an aluminum plate, or the like, similarly to the movable body 8 shown in FIG. 1 and the like, and has a plate-like portion 52a having a square shape in a top view and a circular circle in a top view. Although not shown, the plate-shaped portion 52a is provided with a screw hole for screwing a bolt when fixing the seismic isolation device 51 to the upper structure. This movable body 52 is different from the movable body 8 in that it does not include the concave spherical surface 8d like the movable body 8, and the lower surface 52d of the columnar portion 52b is formed in a plane parallel to the upper surface 52c of the plate portion 52a. That is.

  On the other hand, the resistance plate 53 is formed of a carbon steel plate, a stainless steel plate, an aluminum plate, or the like in a circular shape in a top view similarly to the resistance plate 6 shown in FIG. 1 and the like, but has a connecting portion 6a like the resistance plate 6. The upper surface 53a is entirely formed in a planar shape.

  An elastic body 54 such as rubber is provided between the movable body 52 and the resistance plate 53, and the upper surface 54a of the elastic body 54 is bonded to the lower surface 52d of the columnar portion 52b of the movable body 52 by vulcanization bonding or the like. The lower surface 54b of the body 54 is bonded to the upper surface 53a of the resistance plate 53 by vulcanization bonding or the like.

  According to the seismic isolation device 51 having the above configuration, since the movable body 52 is rotatably connected to the resistance plate 53 via the elastic body 54, when the movable body 52 moves left and right, the elastic body 54 The rotation of the resistance plate 53 is absorbed, and the spacer 7 slides on the concave spherical surface 2a of the spherical plate 2 in a stable state. As a result, it is possible to obtain the frictional resistance and to attenuate the vibration energy applied to the lower structure by the resistance of the viscous body 5 to the spacer 7 and the resistance plate 53.

  Although not shown, the seismic isolation device 51 is also provided with separation preventing means such as the ring-shaped members 34 and 44 shown in FIGS. Even when the body swings greatly in the vertical direction and lifts up, and the pulling force acts on the movable body 52, the movable body 52 and the resistance plate 53 are prevented from separating from each other in the vertical direction, and the elastic body 54 is damaged. Can be prevented.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Spherical plate 2a Concave spherical surface 2b Lower surface 2c Through hole 3 Cylindrical member 5 Viscous body 6 Resistance plate 6a Connecting portion 6b Convex spherical surface 6c Upper surface 6d Lower surface 7 Spacer 8 Movable body 8a Plate portion 8b Cylindrical portion 8c 8d concave spherical surface (lower surface)
8e Screw hole 8f Lower surface 8g Upper side surface 10 Stopper 10a Opening 10b Annular ridge 11 Cover 11a Annular ridge 11b Outer edge 21 Upper structure 22 Lower structure 23 Bolt 24 Channel steel 24a Upper flange 24b Lower flange 25 Bolt 31 Seismic device 32 Movable body 32a Concave spherical surface 32b Groove 33 Resistance plate 33a Connecting portion 33b Upper surface 33c Groove 34 Ring-shaped member 34a First annular ridge 34b Second annular ridge 35 Bolt 41 Seismic isolation device 42 Movable body 42a Concave spherical surface 42b Groove 43 resistance plate 43a connecting portion 43b upper surface 43c groove 44 ring-shaped member 44a first annular ridge 44b second annular ridge 45 bolt 51 seismic isolation device 52 movable body 52a plate-shaped portion 52b columnar portion 52c upper surface 52d lower surface 53 resistance plate 54 Elastic body

Claims (8)

A spherical plate fixed to the lower structure, having a concave spherical surface on the upper surface, and containing a viscous material in the concave spherical surface;
A spacer sliding on the surface of the concave spherical surface of the spherical plate,
A resistor plate located above the spacer, having a gap between the spacer and the concave spherical surface of the spherical plate, and moving with the spacer at least in a state where the viscous body is filled in the gap; ,
A movable body fixed to the upper structure at the upper surface, and a lower surface movably installed on the resistance plate ;
A cover fixed to the spherical plate and covering the concave spherical surface of the spherical plate . A connection portion fixed to the upper surface of the resistance plate and having a convex spherical surface on the upper surface,
The movable body has a concave spherical surface on the lower surface, which is in contact with the convex spherical surface of the connecting portion,
When the convex spherical surface of the connecting portion and the concave spherical surface of the movable body slide with each other, the movable body is rotatably slidably in contact with the resistance plate via the connecting portion. The seismic isolation device according to claim 1. A connection portion fixed to the upper surface of the resistance plate and having a concave spherical surface on the upper surface,
The movable body has, on the lower surface, a convex spherical surface that contacts the concave spherical surface of the connecting portion,
When the concave spherical surface of the connecting portion and the convex spherical surface of the movable body slide with each other, the movable body is rotatably slidably in contact with the resistance plate via the connecting portion. The seismic isolation device according to claim 1. An elastic body is provided between an upper surface of the resistance plate and a lower surface of the movable body,
The seismic isolation device according to claim 1, wherein the movable body is rotatably connected to the resistance plate by elastically deforming the elastic body.   When the movable body moves together with the resistance plate, the movable body is provided with a stopper that is fixed to the spherical plate and restricts the movable body from moving in a direction away from a center of the concave spherical surface of the spherical plate by a predetermined distance or more. The seismic isolation device according to any one of claims 1 to 4, wherein: The movable body is formed in a column shape or a rectangular column shape,
The stopper or the cover has a circular or rectangular opening in a top view for accommodating the movable body, and has a ridge protruding upward at an edge forming the opening. 5. The seismic isolation device according to 5 . 2. A plate-shaped cover fixed to the movable body and having a projection projecting downward from a circular or rectangular outer edge viewed from above, which covers the concave spherical surface of the spherical plate. 3. 7. The seismic isolation device according to any one of claims 6 to 6 . The seismic isolation device according to any one of claims 1 to 7 , further comprising separation prevention means for preventing the resistance plate and the movable body from being separated from each other in a vertical direction.

Images