JP5036768B2 - Seismic isolation support - Google Patents

Description

  The present invention relates to a seismic isolation bearing that reduces the influence of seismic force on a building, and more particularly to a seismic isolation bearing suitable for a small-scale building such as a house.

  Conventionally, as a seismic isolation bearing used for a small-scale building, a rod-like column member is rocked between a lower seat fixed to the upper end of the foundation and an upper seat fixed to the lower end of the building body. There is what was attached so that movement was possible (for example, refer to patent documents 1). In this seismic isolation bearing, spherical bodies are provided at the lower end and upper end of the column member, and these spherical bodies are respectively accommodated in the spherical chamber of the lower receiving seat and the spherical chamber of the upper receiving seat to form spherical joints, respectively. . In the spherical chambers of the lower seat and the upper seat, an opening through which a column member connected to the spherical body extends is provided on the side facing each other. Between the lower seat and the upper seat, a damping member made of plate rubber is attached so as to surround the support member. The strut member is always installed so that the central axis is oriented in the vertical direction, and transmits a load acting on the upper seat to the lower lower seat.

  In this seismic isolation bearing, when the ground vibrates due to an earthquake or the like, the lower end and upper end of the support member rotate with respect to the lower seat and the upper seat, respectively. The vibration is prevented from being transmitted to the building body, and the vibration damping member is deformed to reduce the vibration energy. In this seismic isolation bearing, when the lower seat and the upper seat reach maximum displacement, both ends of the tilted column members abut against the edges of the openings of the lower and upper seats, and the column members are further tilted. By stopping, further displacement of the lower seat and the upper seat is regulated.

By the way, it is thought that the following ability is necessary for the seismic isolation structure of a building.
(1) Support ability that can transmit the weight of the building body to the foundation (2) Deformation ability that the building body and the foundation can be displaced independently of each other in the horizontal direction (3) After the earthquake, the building body is in its original position Restoration ability to restore (4) Damping ability to attenuate the vibration of the building body By providing all these abilities, the seismic isolation structure of the building can ensure the stability of the building at all times and the building at the time of earthquake Can be effectively reduced (see Non-Patent Document 1, for example).

JP 2004-052509 A

Yutaka Inoue, current status and prospects of detached base-isolated houses, architectural technology, architectural technology, October 1, 2004, No. 657, p. 92-93

  However, the conventional seismic isolation bearing has a problem that it is difficult to exhibit the ability required for the seismic isolation structure of a building.

  That is, since the conventional seismic isolation bearing supports the load of the building body via the spherical joint, the wall surface of the spherical chamber constituting the spherical joint and the outer peripheral surface of the spherical body slide while making point contact. Damage is likely to occur. Therefore, there is a problem that the spherical joint is easily broken and the supporting ability is easily lowered.

  In addition, the conventional seismic isolation bearing described above always has the point of contact due to stress concentration because the load of the building body acts continuously on the point contact part between the wall of the spherical chamber and the outer peripheral surface of the spherical body. Are easily damaged. Therefore, there is a problem that the spherical joint is easily broken and the supporting ability is likely to be lowered at any time.

  Further, in the conventional seismic isolation bearing, when the displacement of the lower seat and the upper seat increases, the lower seat and the upper seat are connected to the upper and lower ends of the column member by spherical joints. The vertical separation between the lower seat and the upper seat is reduced by the inclination, and the building body descends and approaches the foundation. Therefore, in order to return the building main body to the original position, it is necessary to raise the building main body, but it is difficult to exert the force for raising the building main body with the vibration damping member of the plate rubber. That is, the conventional seismic isolation bearing has a problem that its restoring ability is low.

  Further, the conventional seismic isolation bearing has a problem that the damping capacity is small because energy is absorbed by elastic deformation of the plate-like rubber of the damping member.

  If it is going to make up for such a deficiency of a restoring capability and a damping capability, it will be necessary to install a metal spring, a viscous damper, etc. besides a seismic isolation bearing, and will lead to an increase in construction cost.

  Further, in the conventional seismic isolation bearing, when the maximum displacement occurs between the seats, both end portions of the inclined column members abut against the edges of the opening of the lower seat and the upper seat. Because a couple of forces corresponding to the load of the building body acts on both ends of the column member from the upper seat, an excessive moment acts on the abutment portion of the lower seat and the upper seat, and it is easy to break. There's a problem. That is, there is a problem that this seismic isolation bearing lacks durability.

  Accordingly, an object of the present invention is to provide a seismic isolation bearing that has sufficient capability necessary for seismic isolation of a building and that has durability.

To achieve the above object, the seismic isolation bearing of the present invention has an upper seat, a lower seat, and a connecting portion formed to be rotatable with respect to the upper seat and the lower seat at the upper end and the lower end, respectively. And a connecting portion that rotates with respect to the upper seat and the lower seat as the upper seat and the lower seat are horizontally displaced, and the support body is inclined. Seismic isolation bearing,
Between the upper seat and the connecting portion at the upper end of the support body, a sliding surface is formed that contacts each other and slides when the connecting portion rotates,
Between the lower seat and the connecting portion at the lower end of the support body, a rolling surface that contacts each other and rolls when the connecting portion rotates, and a sliding surface that contacts each other and slides when the connecting portion rotates. A moving surface is formed ,
The connecting portion at the lower end of the support body is rotatably accommodated in the accommodation chamber of the lower seat,
The rolling surface and sliding surface of the connecting portion at the lower end of the support body and the rolling surface and sliding surface of the storage chamber of the lower seat are formed in a rotationally curved shape,
The sliding surface of the lower seat is characterized in that it has an envelope shape drawn when the connecting portion at the lower end of the support body rotates .

  According to the seismic isolation bearing having the above-described structure, the upper seat is fixed to, for example, the lower end of the building body, and the lower seat is fixed to, for example, the upper end of the foundation, thereby forming a base-isolated structure of the building. In the seismic isolation structure using this seismic isolation bearing, the load of the building body is always transmitted from the upper seat to the upper connection part of the support body, and from the lower connection part of the support body to the lower seat. Communicated. Here, since the rolling contact surface and the sliding surface formed on the lower seat and the connecting portion at the lower end of the support body are in contact with each other, the posture of the support body becomes stable. Therefore, since this seismic isolation bearing can stably support the load of the building body, the support capability can be stably exhibited.

  On the other hand, in the event of an earthquake, as the ground on which the foundation is installed vibrates due to an earthquake or the like, the rolling surface of the lower seat and the rolling surface of the connecting portion at the lower end of the bearing body roll in contact while the bearing body The connecting portion at the lower end of the base rotates relative to the lower seat. Further, the connecting portion at the upper end of the supporting body rotates with respect to the upper receiving seat while the sliding surface between the upper receiving seat and the connecting portion at the upper end of the supporting body slides with each other. As a result, the support body tilts, and the upper seat and the lower seat are displaced until the support body reaches a predetermined maximum tilt angle. Therefore, in this seismic isolation bearing, the upper seat and the lower seat have sufficient displacement capability.

  In addition, during an earthquake, the load of the building body is transmitted through the rolling surface between the support body and the lower seat, so that it is connected rather than transmitting the load only by the sliding surface as in the past. Damage to the part can be reduced. Therefore, the durability of the seismic isolation bearing can be improved as compared with the conventional case.

  Further, when the upper seat and the lower seat are displaced, as the connecting portion at the lower end of the support body rotates with respect to the lower seat, the sliding surface of the lower seat and the connecting portion at the lower end of the support body are moved. As the sliding surface slides and the connecting portion at the upper end of the support body rotates with respect to the upper seat, the sliding surface of the upper seat and the sliding surface of the connecting portion at the upper end of the support body Slides. By sliding of these sliding surfaces, heat energy is generated by friction, and vibration energy corresponding to this heat energy is reduced. Therefore, since the vibration of the building body fixed to the upper seat can be damped, this seismic isolation bearing has a sufficient damping capacity.

  As described above, according to the seismic isolation bearing of the present invention, durability can be improved as compared with the conventional one, and sufficient supporting ability, deformation ability, and damping ability are provided. Therefore, it is possible to form a base isolation structure using only this base isolation bearing without using other devices such as metal springs and viscous dampers in small buildings such as houses, etc., thus reducing the construction cost. be able to.

  It should be noted that the ability to form a base isolation structure using only this base isolation bearing is not intended to exclude the combined use of other devices, and naturally the base isolation structure can be combined with other devices. It may be formed.

  In addition, according to the seismic isolation bearing having the above-described configuration, the rolling motion of the lower support seat is caused by the sliding surface formed between the lower support seat and the lower end connection portion of the support body on the rolling surface of the connection portion. It is possible to provide rolling with substantially no slip with respect to the surface. Further, the sliding surface formed between the lower seat and the connecting portion at the lower end of the support body allows the operation of the support body to be shaped into the rolling surface of the connecting portion and the rolling surface of the lower seat. It is possible to regulate the route according to the response. Therefore, the movement of the upper seat connected to the upper end of the support body and the building body fixed to the upper seat can be restricted. As a result, it is possible to regulate and predict the movement of the building body during an earthquake, effectively preventing damage due to excessive displacement of the building body, and preventing appropriate damage according to the predicted movement Measures can be taken.

In one embodiment, the seismic isolation bearing has a connecting chamber having a substantially spherical inner surface, one of the connecting portion at the upper end of the supporting body and the upper seat.
The other of the upper connection portion and the upper seat of the support body has a spherical convex portion that is accommodated in the connection chamber and has a generally spherical surface,
The inner side surface of the connecting chamber and the surface of the spherical convex portion are in contact with each other,
The connecting portion at the lower end of the bearing body has a diameter-expanding portion with a maximum diameter in the vicinity of the tip and a surface with a rotating curved surface, and a concave portion formed on the end surface and having a circular bottom surface. And
The lower seat expands from the opening or the vicinity of the opening toward the bottom, and has a rotating curved surface with a maximum diameter near the bottom, and projects from the bottom to the opening side and has a radial contour. A convex portion having a circular end surface, the length of which is substantially the same as the radial contour length of the bottom surface of the concave portion of the coupling portion of the support body, and accommodates the coupling portion at the lower end of the support body. Has a containment chamber,
The bottom surface of the concave portion of the connecting portion at the lower end of the support body and the end surface of the convex portion of the receiving chamber of the lower seat come into contact with each other, the surface of the enlarged portion of the connecting portion at the lower end of the support body, and the lower surface The enlarged wall surface of the receiving chamber of the seat comes into contact,
When the upper seat and the lower seat are displaced, the inner surface of the connection chamber of one of the upper connection portion and the upper seat of the support body, and the upper connection portion and the upper seat of the support body. And the bottom surface of the concave portion of the connecting portion at the lower end of the support body and the end surface of the convex portion of the receiving chamber of the lower seat are substantially in sliding contact with the surface of the spherical convex portion of the other of them. The surface of the enlarged diameter portion of the connecting portion at the lower end of the support body and the enlarged diameter wall surface of the accommodating chamber of the lower seat are in sliding contact with each other,
When the support body has a maximum displacement angle with respect to the upper seat, the tip of the connecting portion at the lower end of the support body fits with the bottom of the storage chamber of the lower seat.

  According to the above embodiment, the rolling surface is formed between the bottom surface of the recess formed in the connection portion at the lower end of the support body and the end surface of the projection formed in the storage chamber of the lower seat, and the support A sliding surface is formed between the surface of the enlarged diameter portion formed in the connecting portion at the lower end of the main body and the enlarged diameter wall surface of the lower seat. Also, between the connection chamber formed at one of the upper connection portion and the upper seat of the support body and the convex portion formed at the other of the upper connection portion and the upper seat of the support body. Form a sliding surface. As a result, it is possible to obtain a seismic isolation bearing having good durability and sufficient supporting ability, deformation ability and damping ability.

  In addition, since the surface of the enlarged diameter portion formed in the connecting portion at the lower end of the support body and the enlarged diameter wall surface formed in the receiving chamber of the lower seat are rotationally curved, the central axis of the seismic isolation bearing at all times The bearing body can be rotated without any deviation with respect to any vibration in the right-angle direction, and vibration can be attenuated.

  Further, in the seismic isolation bearing of the above embodiment, when the support body has a maximum displacement angle with respect to the lower seat, the tip of the connecting portion at the lower end of the bearing body is fitted with the bottom of the receiving chamber of the lower seat. Therefore, further angular displacement of the support body relative to the lower seat can be restricted by the compression force of the fitting surface. Therefore, unlike the conventional seismic isolation bearing, an excessive moment is applied at the time of maximum displacement, and the seat is not broken, and good durability can be achieved.

  In addition, the connecting portion at the lower end of the support body is accommodated in the accommodation chamber so that the enlarged diameter portion is in contact with the enlarged wall surface of the lower seat, so that when a force including a vertically upward component acts on the support body, The enlarged diameter portion of the connecting portion at the lower end is locked to the enlarged diameter wall surface of the lower seat. Accordingly, it is possible to prevent the support body from being separated from the lower seat. As a result, this seismic isolation bearing has a retaining effect, and can transmit a force including a vertically upward component applied from the building body to the lower seat through the bearing body.

  In addition, the radial contour length of the bottom surface of the concave portion of the end surface of the convex portion and the bottom end of the support body in the receiving chamber of the lower seat means the end surface of the convex portion and the bottom surface of the concave portion in the radial cross section. This is the length of the line that appears.

The seismic isolation bearing according to another aspect of the present invention includes an upper receiving seat, a lower receiving seat, and a connecting body formed at the upper end and the lower end, each of which is formed to be rotatable with respect to the upper receiving seat and the lower receiving seat. The seismic isolation system is formed so that the connecting body rotates with respect to the upper and lower seats and the support body tilts as the upper and lower seats are displaced horizontally. A bearing,
Between the upper receiving seat and the connecting portion at the upper end of the support body and between the lower receiving seat and the connecting portion at the lower end of the support body, they are in contact with each other and roll when the connecting portion rotates. Both a moving surface and a sliding surface that contacts each other and slides when the connecting portion rotates are formed,
When the upper seat and the lower seat take the maximum displacement, the contact position between the rolling surface of the connecting portion at the upper end of the bearing body and the rolling surface of the upper seat in the horizontal direction is the lower end of the bearing body. The contact position between the rolling surface of the connecting portion and the rolling surface of the lower seat is formed so as not to exceed the displacement direction of the upper seat relative to the lower seat ,
The connecting portion at the upper end of the support body is rotatably accommodated in the accommodating chamber of the upper seat, and the connecting portion at the lower end of the support body is freely rotatable in the accommodating chamber of the lower seat. Contained,
The rolling surfaces and sliding surfaces of the upper and lower connecting portions of the support body and the rolling surfaces and sliding surfaces of the upper and lower receiving chambers are formed in a rotationally curved surface shape.
The sliding surfaces of the upper receiving seat and the lower receiving seat are characterized by having an envelope shape drawn when the upper and lower connecting portions of the support body rotate .

  According to the seismic isolation bearing having the above-described structure, the upper seat is fixed to, for example, the lower end of the building body, and the lower seat is fixed to, for example, the upper end of the foundation, thereby forming a base-isolated structure of the building. In the seismic isolation structure using this seismic isolation bearing, the load of the building body is always transmitted from the rolling surface of the upper seat to the rolling surface of the connecting part at the upper end of the bearing body, and transmitted to this bearing body. The load of the constructed main body is transmitted from the rolling surface of the connecting portion at the lower end of the bearing main body to the rolling surface of the lower seat. Here, since the sliding surfaces of the upper and lower seats and the sliding surfaces of the upper and lower connecting portions of the bearing body are in contact with each other, the bearing body between the upper seat and the lower seat The posture becomes stable. Therefore, since the load of the building body can be stably supported through the rolling surface, this seismic isolation bearing can stably exhibit sufficient support capability.

  On the other hand, in the event of an earthquake, as the ground on which the foundation is installed vibrates due to an earthquake or the like, the rolling surface of the lower seat and the rolling surface of the connecting portion at the lower end of the bearing body roll in contact while the bearing body The lower end of the connecting part rotates with respect to the lower seat, and the upper support seat and the upper end of the support body roll at the upper end of the support body while rolling in contact. The connecting portion rotates with respect to the upper seat. As a result, the support body tilts, and the upper seat and the lower seat are displaced until the support body reaches a predetermined maximum tilt angle. Therefore, in this seismic isolation bearing, the upper seat and the lower seat have sufficient displacement capability.

  Also, in the event of an earthquake, the load on the building main body is caused to roll between the rolling surface between the upper seat and the connecting portion at the upper end of the support body, and between the connecting portion at the lower end of the support body and the lower receiving seat. Since the transmission is performed via the surface, damage to the connecting portion can be reduced as compared with the conventional case where the load is transmitted by the sliding surface. Therefore, the durability of the seismic isolation bearing can be improved as compared with the conventional case.

  Further, when the upper seat and the lower seat are displaced, as the connecting portion at the lower end of the support body rotates with respect to the lower seat, the sliding surface of the lower seat and the connecting portion at the lower end of the support body are moved. As the sliding surface slides and the connecting portion at the upper end of the support body rotates with respect to the upper seat, the sliding surface of the upper seat and the sliding surface of the connecting portion at the upper end of the support body Slides. By sliding of these sliding surfaces, heat energy is generated by friction, and vibration energy corresponding to this heat energy is reduced. Therefore, since the vibration of the building body fixed to the upper seat can be damped, this seismic isolation bearing has a sufficient damping capacity.

  Further, when the upper seat and the lower seat take the maximum displacement, the contact position between the rolling surface of the connecting portion at the upper end of the bearing body and the rolling surface of the upper seat in the horizontal direction is the position of the bearing body. The contact position between the rolling surface of the connecting portion at the lower end and the rolling surface of the lower seat is not exceeded in the displacement direction of the upper seat with respect to the lower seat. Therefore, the force acting from the rolling surface of the upper seat to the rolling surface of the connecting portion at the upper end of the support body, and the action from the rolling surface of the connecting portion at the lower end of the bearing body to the rolling surface of the lower seat. With this force, it is possible to form a couple that moves the upper seat in a direction that reduces the horizontal displacement between the upper seat and the lower seat. Therefore, since the upper seat and the lower seat having the maximum displacement can be moved in the direction in which the displacement decreases, this seismic isolation bearing has a sufficient restoring ability.

  Thus, according to the seismic isolation bearing of the other aspect of the present invention, the durability can be improved as compared with the prior art, and sufficient support ability, deformation ability, damping ability, and restoration ability are provided. Therefore, it is possible to form a base isolation structure using only this base isolation bearing without using other devices such as metal springs and viscous dampers in small buildings such as houses, etc., thus reducing the construction cost. be able to.

  It should be noted that the ability to form a base isolation structure using only this base isolation bearing is not intended to exclude the combined use of other devices, and naturally the base isolation structure can be combined with other devices. It may be formed.

  Furthermore, the sliding surfaces formed between the upper and lower seats and the upper and lower connecting portions of the support body provide the rolling surfaces of the upper and lower connecting portions of the support body. In addition, it is possible to bring about rolling with substantially no slip with respect to the rolling surfaces of the upper seat and the lower seat. Further, the upper receiving seat and the lower receiving seat and the upper and lower connecting portions formed on the upper and lower connecting portions, the sliding surface formed between the upper receiving seat and the lower receiving seat allows the upper receiving seat to operate. It is possible to regulate the path according to the shape of the rolling surface formed between the seat and the lower receiving seat and the connecting portions at the upper and lower ends of the support body. Therefore, the movement of the building body fixed to the upper seat can be restricted. As a result, it is possible to regulate and predict the movement of the building body during an earthquake, effectively preventing damage due to excessive displacement of the building body, and preventing appropriate damage according to the predicted movement Measures can be taken.

In the seismic isolation bearing of one embodiment, the connecting portion of the bearing main body is formed on the end surface with the diameter-expanding portion having a maximum diameter in the vicinity of the tip and a surface having a rotationally curved surface. And a concave portion having a circular bottom surface,
The upper seat and the lower seat are expanded from the opening or the vicinity of the opening toward the bottom, the rotating curved surface having a maximum diameter in the vicinity of the bottom, and a protruding surface from the bottom to the opening side, A convex portion having a circular end surface formed in a radial contour length substantially the same as a radial contour length of a bottom surface of the concave portion of the coupling portion of the support body. Has a storage room for storage,
The bottom surface of the concave portion of the coupling portion of the support body and the end surfaces of the convex portions of the receiving chambers of the upper seat and the lower seat are in contact with each other, the surface of the enlarged diameter portion of the coupling portion of the support body, and the upper The diameter-expanded wall surfaces of the receiving chamber and the lower receiving chamber are in contact with each other.
When the upper seat and the lower seat are displaced, the bottom surface of the concave portion of the connecting portion of the support body and the end surfaces of the convex portions of the receiving chambers of the upper and lower seats are substantially in rolling contact. In addition, the surface of the enlarged diameter portion of the coupling portion of the support body and the enlarged diameter wall surfaces of the upper receiving seat and the receiving chamber of the lower receiving seat are in sliding contact,
When the upper seat and the lower seat take the maximum displacement, the front end of the connecting portion of the support body is fitted to the bottom of the storage chamber of the upper seat and the lower seat, and in the horizontal direction, The contact position between the bottom surface of the concave portion of the connecting portion at the upper end of the support body and the end surface of the convex portion of the receiving chamber of the upper receiving seat is such that the bottom surface of the concave portion of the connecting portion at the lower end of the supporting body and the convexity of the receiving chamber of the lower receiving seat. The contact position with the end face of the part is formed so as not to exceed the displacement direction of the upper seat relative to the lower seat.

  According to the above embodiment, the rolling surface is formed between the bottom surface of the concave portion formed in the coupling portion of the support body and the end surface of the convex portion formed in the accommodation chamber of the upper seat and the lower seat. A sliding surface is formed between the surface of the enlarged diameter portion formed in the connecting portion of the support body and the enlarged diameter wall surfaces of the upper seat and the lower seat. As a result, it is possible to obtain a seismic isolation bearing having good durability and sufficient supporting ability, deformation ability, restoring ability and damping ability.

  Furthermore, since the surface of the enlarged diameter portion formed in the connecting portion of the support body and the enlarged diameter wall surface formed in the storage chambers of the upper seat and the lower seat are rotationally curved, The upper seat and the lower seat can be displaced horizontally and can be damped with respect to any vibration in the direction perpendicular to the central axis.

  Further, when the upper seat and the lower seat take the maximum displacement, the front end of the connecting portion of the support body is fitted to the bottom of the storage chamber of the upper seat and the lower seat, so that these fitting surfaces Further displacement of the upper seat and the lower seat can be regulated by the compressive force. Therefore, unlike the conventional seismic isolation bearing, an excessive moment is applied at the time of maximum displacement, and the seat is not broken, and good durability can be achieved.

  In addition, the connecting portion between the upper end and the lower end of the support body is accommodated in the accommodating chamber so that the enlarged diameter portion is in contact with the enlarged diameter wall surfaces of the upper and lower seats. When this occurs, the enlarged diameter portion of the connecting portion at the upper end of the bearing body is locked to the enlarged diameter wall surface of the upper receiving seat, and the enlarged diameter portion of the connecting portion at the lower end of the supporting body is engaged with the enlarged diameter wall surface of the lower receiving seat. Thus, separation of the upper seat, the support body, and the lower seat can be prevented. As a result, this seismic isolation bearing has a retaining effect and can sufficiently transmit the force including the vertical upward component acting on the upper seat from the building body to the lower seat via the bearing body.

  The radial contour length of the end surface of the convex portion and the bottom surface of the concave portion of the support body means the length of a line that appears when the end surface of the convex portion and the bottom surface of the concave portion are represented in the radial cross section.

In the seismic isolation bearing of one embodiment, the upper seat and / or the lower seat have an annular tapered surface that is formed between the opening and the enlarged wall surface, and has a diameter that decreases from the opening toward the bottom.
When the upper seat and the lower seat take the maximum displacement, the side surface of the portion between the connecting portion at the upper end and the connecting portion at the lower end of the support body is a tapered surface of the upper seat and / or the lower seat. Abut.

  According to the above embodiment, when the upper seat and the lower seat take the maximum displacement, the side surface of the portion between the upper end connecting portion and the lower end connecting portion of the support main body is the upper receiving seat and / or the lower receiving seat. It contacts the tapered surface of the seat. Further displacement of the upper seat and the lower seat is restricted by the compressive force acting on the contact surface between the side surface of the support body and the tapered surface of the upper seat and / or the lower seat. Thereby, the inconvenience that an excessive moment acts and the seat is destroyed as in the conventional seismic isolation bearing can be prevented, and the durability of the seismic isolation bearing can be enhanced.

  In one embodiment, the seismic isolation bearing has an enlarged wall surface formed in the accommodation chamber of the upper seat and / or the lower seat. It has the shape of the envelope surface which the surface of an enlarged diameter part draws when a connection part rotates.

  According to the above-described embodiment, when the connecting portion of the support body having the enlarged diameter portion rotates in the accommodation chamber of the upper receiving seat and / or the lower receiving seat in which the enlarged diameter wall surface is formed, the diameter of the connecting portion is increased. The surface of the portion and the enlarged wall surface of the storage chamber can be effectively slid. Therefore, it is possible to efficiently generate thermal energy due to the friction of these sliding surfaces, and as a result, it is possible to effectively reduce vibration energy and effectively attenuate vibration.

  In one embodiment, the seismic isolation bearing includes a bottom surface of the concave portion of the coupling portion of the bearing body and an end surface of the convex portion of the storage chamber of the upper and lower seats, the horizontal displacement of the upper seat and the lower seat. As the distance increases, the vertical distance between the upper seat and the lower seat increases.

  According to the above embodiment, as the horizontal displacement between the upper seat and the lower seat increases, the vertical distance between the upper seat and the lower seat increases, so the position of the upper seat with respect to the lower seat Energy increases. As a result, the displaced upper and lower seats can be moved in the direction of reducing the vertical separation, that is, in the direction of decreasing horizontal displacement. Has a sufficient ability to restore seats.

  The seismic isolation bearing according to an embodiment includes a bottom surface of the concave portion of the coupling portion of the bearing main body, and an end surface of the convex portion of the accommodation chamber of the upper receiving seat and / or the lower receiving seat that accommodates the connecting portion in which the concave portion is formed. At least one of these is formed in a shape in which the central portion bulges rather than the peripheral portion.

  According to the above embodiment, the bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the receiving chamber of the upper receiving seat and / or the lower receiving seat for receiving the connecting portion in which the concave portion is formed are stabilized. And can be brought into rolling contact. In addition, it is preferable that the bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the upper receiving seat and / or the lower receiving seat have the same contour length appearing in the radial cross section. .

  The seismic isolation bearing according to an embodiment includes a bottom surface of the concave portion of the coupling portion of the bearing main body, and an end surface of the convex portion of the accommodation chamber of the upper receiving seat and / or the lower receiving seat that accommodates the connecting portion in which the concave portion is formed. However, they are formed on the same curved surface with the central portion bulging from the peripheral portion.

  According to the above embodiment, the bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the upper receiving seat and / or the receiving chamber of the lower receiving seat that accommodate the connecting portion in which the concave portion is formed are the peripheral portion. A contact state close to point contact can be obtained by forming a curved surface with the center portion bulging. Therefore, the connecting portion of the support body can be smoothly rolled with respect to the upper seat and / or the lower seat. Further, the bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the storage chamber of the upper seat and / or the lower seat are formed on the same curved surface, so that the bottom surface of the concave portion and the convex portion of the convex portion are formed. It can be formed so as to contact the end face without waste, and it is possible to prevent a wasteful area or space from being generated between the connecting portion and the storage chamber. Therefore, since the peripheral part of the connection part of a support main body can be reduced in size, a support main body can be reduced in size effectively.

  In addition, the side surface of the concave part connected to the bottom surface of the concave part of the connecting part, and the side surface of the convex part connected to the end surface of the convex part of the receiving chamber of the upper receiving seat and / or the lower receiving seat for receiving the connecting part in which the concave part is formed. However, it is preferable that they have shapes that can be fitted to each other. As a result, when the connecting portion rotates so that the bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the upper receiving seat and / or the receiving chamber of the lower receiving seat are in contact with each other at the edge, The side surface of the concave portion and the side surface of the convex portion of the storage chamber are fitted, and further rotation is restricted. Therefore, when the connecting portion reaches the maximum rotation angle with respect to the storage chamber, it is possible to further reduce the connecting portion while preventing the inconvenience that the seat is damaged by an excessive moment as in the conventional case. Can be controlled.

  The seismic isolation bearing according to an embodiment includes a bottom surface of the concave portion of the coupling portion of the bearing main body, and an end surface of the convex portion of the accommodation chamber of the upper receiving seat and / or the lower receiving seat that accommodates the connecting portion in which the concave portion is formed. However, the central part is formed in the same shape with a flat surface and a peripheral part with a curved surface.

  According to the above embodiment, the bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the receiving chamber of the upper receiving seat and / or the lower receiving seat that accommodate the connecting portion in which the concave portion is formed at all times. Are in surface contact with each other by a plane formed at the center of each. Therefore, since the stress acting on the connecting portion of the support body and the upper seat and / or the lower seat can be reduced, the contact surface is caused by the load acting continuously like a spherical joint that transmits the load by point contact. The inconvenience of being damaged can be prevented. Here, the bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the storage chamber of the upper seat and / or the lower seat are asymptotically between the flat surface of the central portion and the curved surface of the peripheral portion. It is preferable to form so that it may be connected to. As a result, as the connecting portion between the upper end and the lower end of the support body rotates with respect to the upper seat and the lower seat in accordance with vibration such as an earthquake, the bottom surface and the upper seat of the recess of the connecting portion of the support body The contact state with the end surface of the convex portion of the receiving chamber of the lower receiving seat smoothly transitions from surface contact to point contact. Therefore, the support body can swing smoothly with respect to the upper seat and / or the lower seat, and the upper seat and the lower seat can be displaced smoothly. Moreover, generation | occurrence | production of harmful stress concentration can be prevented. In addition, since the bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the storage chamber of the upper seat and / or the lower seat are in contact with each other over a much larger area than usual in the case of point contact. The building connected to the upper seat can be stably supported.

  In the seismic isolation bearing according to one embodiment, the diameter-enlarged portion formed in the connecting portion of the bearing body has a small curvature portion and a large curvature portion connected to the distal end side of the small curvature portion, and the upper seat When the upper seat and the lower seat take the maximum displacement, the large curvature portion of the enlarged diameter portion is the opening side of the enlarged seat wall of the upper seat and / or the lower seat that accommodates the connecting portion in which the enlarged diameter portion is formed. It is formed so as to be locked to the end of the.

  According to the above-described embodiment, the large curvature portion of the enlarged diameter portion formed in the connecting portion of the support body has the upper receiving seat and / or the lower receiving seat that accommodates the connecting portion in which the enlarged diameter portion is formed. Since it is locked to the end of the diameter wall on the opening side, even if an upward force is applied to the upper seat when the upper seat and the lower seat take the maximum displacement, the upper seat and the lower seat And the support body can be prevented from separating. Therefore, this seismic isolation bearing has a sufficiently high retaining effect even when the upper seat and the lower seat have the maximum displacement, and has the ability to resist the lifting of the building body fixed to the upper seat. It can be demonstrated.

  In the seismic isolation bearing of one embodiment, a viscous fluid is filled between the connecting portion at the lower end of the bearing body and the storage chamber of the lower seat.

  According to the above embodiment, when the connecting portion at the lower end of the support body rotates with respect to the lower seat, the connecting portion is rotated by the buffering action of the viscous fluid filled between the connecting portion and the storage chamber. Can be attenuated. Accordingly, since the swinging of the bearing body with respect to the lower seat is attenuated, the damping capability of the seismic isolation bearing can be further enhanced. In addition, it is only necessary to fill the space existing between the connecting portion at the lower end of the support body and the receiving chamber of the lower seat with viscous fluid, so that the damping capacity can be improved without increasing the size of the base isolation support. Can do.

  Here, when the diameter-enlarged wall surface of the receiving chamber of the lower seat has the shape of an envelope surface drawn by the surface of the enlarged-diameter portion of the support body, the damping capacity can be effectively obtained. That is, when the enlarged wall surface of the receiving chamber of the lower seat has an envelope shape, when the connecting portion at the lower end of the support body is always in position, the surface of the enlarged portion of the connecting portion and the lower seat A substantially linear contact is made with the enlarged wall surface of the storage chamber. With respect to this line contact position, the space between the connecting portion and the storage chamber is divided into an upper chamber and a lower chamber. When the connecting portion of the support body rotates from this normal position, the enlarged diameter wall surface of the receiving chamber of the lower seat is formed on the envelope surface of the enlarged diameter portion of the support body. The line contact with the wall surface is interrupted, resulting in a gap. When the viscous fluid flows between the upper chamber and the lower chamber through this gap, the viscous fluid receives flow resistance and the rotation of the connecting portion is attenuated. In this way, the rotation of the connecting portion can be damped only by filling the viscous fluid between the connecting portion at the lower end of the bearing body and the receiving chamber of the lower receiving seat without adding a component that gives resistance to the viscous fluid. Since the swinging of the bearing body can be attenuated, the damping capacity of the seismic isolation bearing can be effectively improved.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to stably support the load of a building main body with a rolling surface, the vibration of a building main body can be attenuate | damped by converting into thermal energy by sliding of a contact surface. Therefore, it has sufficient durability and sufficient capability required for a seismic isolation structure.For example, it can be exempted from small buildings such as houses without using other devices such as metal springs and viscous dampers. Seismic isolation bearings that can exert seismic effects are obtained.

It is sectional drawing which shows the seismic isolation bearing of 1st Embodiment. It is sectional drawing of an upper seat. It is sectional drawing of a support main body. It is sectional drawing of a lower seat. It is sectional drawing which shows a mode that the seismic isolation bearing of 1st Embodiment took the maximum displacement. It is sectional drawing which shows the seismic isolation bearing of 2nd Embodiment. It is sectional drawing which shows a mode that the seismic isolation bearing of 2nd Embodiment took the maximum displacement. It is sectional drawing which shows the seismic isolation bearing of 3rd Embodiment. It is sectional drawing which shows a mode that the seismic isolation bearing of 3rd Embodiment took the largest displacement. It is sectional drawing which shows the seismic isolation bearing of a modification. It is sectional drawing which shows a mode that the seismic isolation bearing of the modification took the maximum displacement.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view showing a seismic isolation bearing according to a first embodiment of the present invention. This seismic isolation bearing is used in houses as small-scale buildings and constitutes a seismic isolation structure. The base 2 is fixed to the lower end of the building body, and the foundation installed on the ground. The lower receiving seat 3 is fixed to the upper end, and the supporting body 1 is swingably connected between the upper receiving seat and the lower receiving seat.

  2A is a cross-sectional view of the upper receiving seat 2, FIG. 2B is a cross-sectional view of the support body 1, and FIG. 2C is a cross-sectional view of the lower receiving seat 3.

  The support body 1 has a substantially cylindrical pincushion shape, and includes a columnar part 11 located at the center in the extending direction of the central axis X1 and connecting parts formed respectively at the upper end and the lower end of the columnar part 11. The connecting portion is a portion that is rotatably accommodated in the accommodating chambers of the upper receiving seat 2 and the lower receiving seat 3, and has enlarged diameter portions 12 and 15 that are continuous with the cylindrical portion 11, and concave portions 13 and 16 that are formed on the end surfaces. Have The enlarged diameter portions 12 and 15 are formed so as to increase in diameter from the end of the cylindrical portion 11 toward the tip, and have a maximum diameter in the vicinity of the upper end. The recesses 13 and 16 have tapered side surfaces 13a and 16a that are reduced in diameter from the opening end toward the bottom, and bottom surfaces 13b and 16b that have a central portion that is higher than the peripheral edge. These bottom surfaces 13b and 16b have a central portion formed in a flat surface, and a peripheral edge portion formed in a gently curved surface, and the curved surface of the peripheral edge portion is asymptotically connected to the flat surface in the central portion. Between the front end edge of the enlarged diameter parts 12 and 15, and the opening edge of the recessed parts 13 and 16, the annular end parts 14 and 17 which draw a curve in a radial cross section are formed. The bottom surfaces 13 b and 16 b of the recesses 13 and 16 function as rolling surfaces of the support body 1, and the surfaces of the enlarged diameter portions 12 and 15 function as sliding surfaces of the support body 1. The surfaces of the cylindrical portion 11, the enlarged diameter portions 12 and 15, the recessed portions 13 and 16, and the annular end portions 14 and 17 are formed as rotating curved surfaces having a common central axis X <b> 1.

  The upper seat 2 includes a cylindrical seat body 21 having an opening at the lower end surface, and a flange 22 formed at the upper end of the seat body 21. The opening at the lower end surface of the seat body 21 is formed in the interior and is connected to a housing chamber 23 that houses the connecting portion of the support body 1. The storage chamber 23 is formed in the opening, and has an annular tapered surface 24 whose diameter decreases toward the bottom, a diameter-enlarged wall surface 25 connected to the tapered surface 24, and an inner side of the diameter-enlarged wall surface 25. It has the convex part 26 which protrudes toward opening. The convex portion 26 has a generally truncated cone shape, and has a gently curved end surface 26a whose central portion bulges higher than the peripheral portion, and a tapered side surface 26b that continues to the edge of the end surface 26a and expands toward the bottom. Have The convex portion 26 has a height that is about half of the diameter-expanded wall surface 25. Between the bottom side edge of the tapered side surface 26b of the convex portion 26 and the bottom side edge of the diameter-expanded wall surface 25, an annular groove 27 that forms a curve in the radial cross section is formed. The surfaces of the tapered surface 24, the diameter-expanded wall surface 25, the convex portion 26, and the annular groove 27 of the storage chamber 23 are formed into a rotationally curved surface having the central axis X2 in common.

  The surface of the end surface 26 a of the convex portion 26 of the upper seat 2 is formed in substantially the same shape as the bottom surface 13 b of the concave portion 13 provided at the upper end of the support body 1. That is, the end surface 26a of the convex portion 26 has a central portion formed in a flat surface, while a peripheral portion is formed in a gently curved surface, and the curved surface of the peripheral portion is asymptotically connected to the flat surface of the central portion. Yes. The enlarged diameter wall surface 25 of the upper seat 2 has an envelope shape drawn when the enlarged diameter portion 12 at the upper end of the support body 1 rotates. The end surface 26 a of the convex portion 26 functions as a rolling surface of the upper receiving seat 2, and the diameter-expanded wall surface 25 of the storage chamber 23 functions as a sliding surface of the upper receiving seat 2.

  The lower receiving seat 3 has substantially the same shape as the upper receiving seat 2 and is disposed vertically opposite to the upper receiving seat 2. That is, the lower seat 3 includes a cylindrical seat body 31 and a flange 32, and the seat body 31 has a storage chamber 33 that is continuous with the opening on the upper end surface. The accommodation chamber 33 includes a tapered surface 34 of the opening, a diameter-expanded wall surface 35 that continues to the taper surface 34, a convex portion 36 inside the diameter-expanded wall surface 35, a bottom edge of the diameter-expanded wall surface 35, and the convex portion 36. An annular groove 37 is provided between the bottom edge. The convex portion 36 has a height about half that of the diameter-expanded wall surface 35, and has a gently curved end surface 36a whose center portion bulges higher than the peripheral edge portion, and a tapered side surface 36b that increases in diameter toward the bottom. Have. The surfaces of the tapered surface 34, the enlarged diameter wall surface 35, the convex portion 36, and the annular groove 37 of the storage chamber 33 are formed into a rotating curved surface having the central axis X3 in common.

  The surface of the end surface 36 a of the convex portion 36 of the lower seat 3 is formed in substantially the same shape as the bottom surface 16 b of the concave portion 16 provided at the lower end of the support body 1. That is, the end surface 36a of the convex portion 36 has a central portion formed in a flat surface, while the peripheral portion is formed in a gently curved surface, and the curved surface of the peripheral portion is asymptotically connected to the flat surface of the central portion. Yes. In addition, the enlarged diameter wall surface 35 of the lower seat 3 has an envelope shape drawn when the enlarged diameter portion 15 at the lower end of the support body 1 rotates. The end surface 36 a of the convex portion 36 functions as a rolling surface of the lower receiving seat 3, and the enlarged diameter wall surface 35 of the storage chamber 33 functions as a sliding surface of the lower receiving seat 3.

  A plurality of the seismic isolation bearings are arranged between the foundation and the building body, the flange 22 of the upper seat 2 is fixed to the lower end of the building body, and the flange 32 of the lower seat 3 is fixed to the upper end of the foundation. Fixed to. Thereby, the building main body can be displaced with respect to the foundation.

  When there is no vibration such as an earthquake, the load of the building body is transmitted from the end surface 26a of the convex portion 26 of the upper seat 2 to the bottom surface 13b of the concave portion 13 at the upper end of the support body 1, and is transmitted to this support body 1. The load of the building body is transmitted from the bottom surface 16b of the recess 16 at the lower end to the end surface 36a of the projection 36 of the lower seat 3. Here, since the enlarged diameter wall surfaces 25 and 35 of the upper receiving seat 2 and the lower receiving seat 3 and the surfaces of the enlarged diameter portions 12 and 15 at the upper end and the lower end of the support body 1 are in contact with each other, the upper receiving seat 2 The posture of the support body 1 between the lower seat 3 and the lower seat 3 becomes stable. Therefore, since the load of the building body can be stably supported through the end surfaces 26a, 36a of the convex portions 26, 36 and the bottom surfaces 13b, 16b of the concave portions 13, 16, this seismic isolation bearing is sufficient. Support ability can be demonstrated stably.

  In addition, the bottom surfaces 13b and 16b of the concave portions 13 and 16 at the upper and lower ends of the support body 1 and the end surfaces 26a and 36a of the convex portions 26 and 36 of the upper and lower seats 2 and 3 are formed at the center. The surface of the building is brought into surface contact with each other to transmit the load of the building body. Accordingly, since the stress acting on the contact portion between the bearing body 1 and the upper seat 2 and the lower seat 3 can be made relatively small, the stress concentration on the contact surface that makes point contact like a conventional seismic isolation bearing having a spherical joint. Will not be damaged. Therefore, this seismic isolation bearing has good durability with respect to a load that acts continuously at all times.

  On the other hand, in an earthquake or the like, as the ground vibrates due to an earthquake or the like, the end surface 36a of the convex portion 36 of the lower seat 3 and the bottom surface 16b of the concave portion 16 at the lower end of the support body 1 roll in contact with each other, The connecting portion at the lower end of the support body 1 rotates with respect to the lower seat 3. At the same time, the end surface 26a of the convex portion 26 of the upper receiving seat 2 and the bottom surface 13b of the concave portion 13 at the upper end of the supporting body 1 roll in contact with each other, and the connecting portion at the upper end of the supporting main body 1 is connected to the upper receiving seat 2. It rotates with respect to it. As a result, the support body 1 is inclined, and the upper seat 2 and the lower seat 3 are displaced until the support body 1 reaches a predetermined maximum inclination angle. Accordingly, in this seismic isolation bearing, the upper seat 2 and the lower seat 3 have sufficient displacement capability.

  This seismic isolation bearing performs a vibration damping action when the upper seat 2 and the lower seat 3 are displaced. That is, as the connecting portion at the lower end of the support body 1 rotates with respect to the lower receiving seat 3, the surface of the enlarged diameter wall surface 35 of the accommodation chamber 33 of the lower receiving seat 3 and the enlarged diameter portion 15 at the lower end of the supporting body 1. And slide. At the same time, as the connecting portion at the upper end of the support body 1 rotates with respect to the upper seat 2, the diameter-expanded wall surface 25 of the accommodation chamber 23 and the surface of the diameter-expanded portion 12 at the upper end of the support body 1 slide. To do. By sliding between these enlarged diameter wall surfaces 25 and 35 and the surfaces of the enlarged diameter portions 12 and 15, thermal energy is generated by friction, and vibration energy corresponding to the thermal energy is reduced. In addition, the enlarged diameter wall surfaces 25 and 35 of the upper and lower seats 2 and 3 have the shape of an envelope drawn when the enlarged diameter portions 12 and 15 at the upper end and the lower end of the support body 1 rotate. Therefore, in the displacement process of the upper receiving seat 2 and the lower receiving seat 3, the contact state between the enlarged diameter wall surfaces 25 and 35 and the enlarged diameter portions 12 and 15 is maintained. Therefore, sufficient heat energy is generated by the contact between the expanded wall surfaces 25 and 35 and the expanded diameter portions 12 and 15, and vibration energy can be effectively reduced. Thus, the vibration of the building main body fixed to the upper seat 2 can be effectively damped, so that this seismic isolation bearing has a sufficient damping capacity.

  In addition, during the earthquake, the load of the building body is such that the bottom surfaces 13b and 16b of the recesses 13 and 16 that are the rolling surfaces of the support body 1 and the convex portions that are the rolling surfaces of the upper seat 2 and the lower seat 3 26 and 36 are transmitted via end surfaces 26a and 36a. Therefore, since the surface damage of the rolling surface can be reduced as compared with the conventional spherical joint in which the load is transmitted on the sliding surface, the durability of the seismic isolation bearing can be improved as compared with the conventional art.

  FIG. 3 is a cross-sectional view showing a state in which the upper seat 2 and the lower seat 3 of the seismic isolation bearing have taken the maximum displacement. When the upper seat 2 and the lower seat 3 take the maximum displacement, in the horizontal direction, the edge of the bottom surface 13b of the recess 13 at the upper end of the support body 1, and the edge of the end surface 26a of the projection 26 of the upper seat 2 The contact position does not exceed the contact position between the edge of the bottom surface 16 b of the recess 16 at the lower end of the support body 1 and the edge of the end surface 36 a of the projection 36 of the lower seat 3. In other words, in FIG. 3, the horizontal position of the load F <b> 1 that acts on the support body 1 from the upper seat 2 is as follows, where the upper seat 2 has taken the maximum rightward displacement with respect to the lower seat 3. The distance D is closer to the left side, which is opposite to the displacement direction, than the horizontal position of the reaction force F2 acting on the support body 1 from the lower seat 3. Accordingly, the load F1 and the reaction force F2 acting on the support body 1 become a couple in a direction that reduces the displacement of the upper seat 2 and the lower seat 3, so the upper seat 2 and the lower seat that have taken the maximum displacement. The seat 3 can be moved in a direction in which the displacement decreases.

  Furthermore, the end surfaces 26a and 36a of the convex portions 26 and 36 of the upper seat 2 and the lower seat 3 and the bottom surfaces 13b and 16b of the upper and lower concave portions 13 and 16 of the support body 1 that are in contact therewith are both central portions. Bulges higher than the peripheral edge, and the peripheral edge is formed in a gently curved surface, so that the horizontal displacement of the upper receiving seat 2 and the lower receiving seat 3 increases as the upper receiving seat 2 and the lower receiving seat 3 increase. The vertical separation of the seat 3 increases and the upper seat 2 rises relative to the lower seat 3. In the maximum displacement shown in FIG. 3, the upper seat 2 reaches the highest raised position with respect to the lower seat 3. As described above, as the upper seat 2 and the lower seat 3 are displaced, the potential energy of the upper seat 2 with respect to the lower seat 3 is increased, so that the displaced upper seat 2 and lower seat 3 are moved in the vertical direction. It is possible to operate in the direction of reducing the separation of the horizontal axis, that is, in the direction of reducing the horizontal displacement. Therefore, the restoring ability of the upper seat 2 and the lower seat 3 can be further enhanced.

  Further, when the upper receiving seat 2 and the lower receiving seat 3 take the maximum displacement, the annular end portions 14 and 17 of the upper and lower connecting portions of the support body 1 are connected to the annular grooves 27 of the upper receiving seat 2 and the lower receiving seat 3. , 37, and further displacement of the upper seat 2 and the lower seat 3 is restricted by a compressive force acting on these fitting surfaces. Further, when the upper receiving seat 2 and the lower receiving seat 3 take the maximum displacement, the side surface of the cylindrical portion 11 of the support body 1 contacts the tapered surface 24 of the upper receiving seat 2 and the tapered surface 34 of the lower receiving seat 3. The further displacement of the upper seat 2 and the lower seat 3 is regulated by the compressive force acting on the contact surfaces. Thereby, unlike the conventional seismic isolation bearing, since an excessive moment acts at the time of the maximum displacement and the seat is not destroyed, this seismic isolation bearing can exhibit good durability.

  As described above, the seismic isolation bearing according to the present embodiment can improve durability as compared with the conventional one, and has sufficient support ability, deformation ability, restoration ability, and damping ability. Therefore, for example, a seismic isolation structure can be formed using only this seismic isolation bearing without using other devices such as metal springs and viscous dampers in small buildings such as houses. As a result, it is possible to reduce the construction cost and effectively reduce the time and labor of the seismic isolation structure.

  Further, the seismic isolation bearing of the present embodiment includes an enlarged wall surface 25 of the upper seat 2 and an enlarged wall surface 35 of the lower seat 3, and enlarged portions 12 and 15 of the upper and lower connecting portions of the support body 1. The end face of the convex part 26 of the upper seat 2 on the rolling surface of the bottom face 13b, 16b of the concave part 13, 16 formed in the connecting part of the upper end and the lower end of the support body 1 26a and the rolling surface of the end surface 36a of the convex portion 36 of the lower seat 3 can cause a substantially non-slip rolling. Further, a sliding surface formed between the enlarged diameter wall surface 25 of the upper receiving seat 2 and the enlarged diameter wall surface 35 of the lower receiving seat 3 and the enlarged diameter portions 12 and 15 of the upper and lower connecting portions of the support body 1. Thus, the movement of the upper receiving seat 2 relative to the lower receiving seat 3 is performed by the rolling surfaces of the bottom surfaces 13b and 16b of the recesses 13 and 16 formed at the upper and lower connecting portions of the support body 1 and the convexity of the upper receiving seat 2. It is possible to regulate the path according to the shape of the rolling surface of the end surface 26 a of the portion 26 and the end surface 36 a of the convex portion 36 of the lower seat 3. Therefore, the movement of the building body fixed to the upper seat 2 can be restricted. As a result, it is possible to regulate and predict the movement of the building body during an earthquake, effectively preventing damage due to excessive displacement of the building body, and preventing appropriate damage according to the predicted movement Measures can be taken.

  Further, in the seismic isolation bearing of the present embodiment, the upper and lower connecting portions of the bearing body 1 have the enlarged diameter portions 12 and 15, and the enlarged diameter portions 12 and 15 correspond to the upper receiving seat 2 and the lower receiving seat 3. Since they are accommodated in the accommodating chambers 23 and 33 so as to be in contact with the enlarged diameter wall surfaces 25 and 35, respectively, when a force including a vertically upward component acts on the upper seat 2, the upper and lower connecting portions of the support body 1 are connected. The enlarged diameter portions 12 and 15 are engaged with the enlarged diameter wall surfaces 25 and 35 of the upper receiving seat 2 and the lower receiving seat 3, thereby preventing the upper receiving seat 2, the support body 1 and the lower receiving seat 3 from being separated. As a result, this seismic isolation bearing has a retaining effect, and sufficiently transmits the force including the vertical upward component acting on the upper seat 2 from the building body to the lower seat 3 via the bearing body 1. Can do.

  In the above embodiment, the end surfaces 26a and 36a of the convex portions 26 and 36 of the upper seat 2 and the lower seat 3 and the bottom surfaces 13b and 16b of the upper and lower concave portions 13 and 16 of the support body 1 are both provided. The central part bulges higher than the peripheral part, and the central part is flat and the peripheral part is a curved surface, but the end surfaces 26a and 36a and the bottom surfaces 13b and 16b are formed in different shapes. Alternatively, either one of the entire surfaces may be formed on a flat surface. Further, the end surfaces 26a and 36a and the bottom surfaces 13b and 16b may be formed of only curved surfaces. In short, as long as the horizontal displacement of the upper seat 2 and the lower seat 3 increases, the vertical distance between the upper seat 2 and the lower seat 3 increases as long as the end surfaces 26a and 36a and the bottom surface 13b. , 16b may have any shape.

  Moreover, in the said embodiment, although the cyclic | annular taper surfaces 24 and 34 were formed in the opening of the upper receiving seat 2 and the lower receiving seat 3, the taper surfaces 24 and 34 may not be provided. That is, the diameter-expanded wall surfaces 25 and 35 may be directly formed in the openings of the upper seat 2 and the lower seat 3. In this case, when the upper seat 2 and the lower seat 3 take the maximum displacement, the side surface of the cylindrical portion 11 of the support body 1 does not come into contact with the upper seat 2 and the lower seat 3. Further restriction of displacement of the lower seat 3 is performed only by fitting the annular ends 14 and 17 of the support body 1 with the annular grooves 27 and 37 of the upper seat 2 and the lower seat 3. By deleting the tapered surfaces 24 and 34, the height of the upper seat 2 and the lower seat 3 can be reduced.

  Although the seismic isolation structure can be formed using only this seismic isolation bearing, other devices such as a metal spring and a viscous damper may be provided as appropriate.

(Second Embodiment)
FIG. 4 is a sectional view showing a seismic isolation bearing according to the second embodiment of the present invention. The seismic isolation bearing of the second embodiment is different from the first embodiment in that the enlarged diameter portion of the connecting portion of the bearing body 1 is formed by a small curvature portion and a large curvature portion. About the seismic isolation bearing of 2nd Embodiment, the same reference number is quoted for the substantially same component as the seismic isolation bearing of 1st Embodiment, and detailed description is abbreviate | omitted.

  As shown in FIG. 4, in the seismic isolation bearing of this embodiment, the enlarged diameter portions 12 and 15 of the connecting portion at the upper end and the lower end of the supporting body 1 are composed of small curvature portions 121 and 151 and large curvature portions 122 and 152. Is formed. The small curvature parts 121 and 151 are connected to the upper and lower ends of the cylindrical part 11 and are expanded in diameter so as to draw a curved line having a small curvature in the cross section. The large curvature portions 122 and 152 are connected to the distal end sides of the small curvature portions 121 and 151, and are expanded in diameter so as to draw a curve having a larger curvature than the small curvature portions 122 and 152 in the cross section.

  Further, the diameter-enlarged wall surfaces 25 and 35 of the upper seat 2 and the lower seat 3 are such that the edges on the opening side (portions indicated by Y1 and Y2 in FIG. 4) have a large curvature of the diameter-enlarged portions 12 and 15. The portions 122 and 152 are formed in a shape corresponding to the surface of the portion on the small curvature portion 121 and 151 side (portion indicated by X1 and X2 in FIG. 4).

  When the seismic isolation bearing of this embodiment operates and the upper seat 2 and the lower seat 3 take the maximum displacement, as shown in FIG. 5, the large curvature portions 122, The portions of the small curvature portions 121 and 151 on the side of 152 are engaged with the opening sides of the enlarged diameter wall surfaces 25 and 35 of the upper seat 2 and the lower seat 3. Thereby, even if an upward force is applied to the upper seat 2 when the upper seat 2 and the lower seat 3 take the maximum displacement, the upper seat 2, the lower seat 3, and the support body 1 are Separation can be prevented. Therefore, this seismic isolation bearing can obtain a retaining effect and can exhibit the floating resistance ability of the building body fixed to the upper seat 2.

  In each of the above embodiments, the interiors of the storage chambers 33 of the upper receiving seat 2 and the lower receiving seat 3 are open to the atmosphere, but the space between the receiving chamber 33 of the lower receiving seat 3 and the connecting portion at the lower end of the support body 1 is not limited. A damper function may be imparted to the seismic isolation bearing by filling it with oil as a viscous fluid. For example, oil is filled between the surfaces of the enlarged diameter wall surface 35 and the convex portion 36 of the lower seat 3 and the surfaces of the enlarged diameter portion 15 and the concave portion 16 of the support body 1. Here, since the diameter-expanded wall surface 35 of the lower receiving seat 3 and the surface of the diameter-expanded portion 15 of the support body 1 are normally in line contact with each other, the connection between the connecting portion and the accommodating chamber 33 is related to this line-contact position. Is divided into an upper chamber and a lower chamber. The upper chamber is filled with oil to form an upper oil chamber, and the lower chamber is filled with oil to form a lower oil chamber.

  When the connecting portion of the support body 1 is rotated by vibration such as an earthquake, the enlarged diameter wall surface 35 of the lower seat 3 is formed on the envelope surface of the enlarged diameter portion 15 of the support body 1. And the line contact between the expanded-diameter wall surface 35 is interrupted and a gap is generated. When oil flows between the upper oil chamber and the lower oil chamber through this gap, the oil receives flow resistance and the rotation of the connecting portion is attenuated. In this way, the rotation of the connecting portion can be damped only by filling the space between the connecting portion of the support body 1 and the accommodating chamber 33 of the lower receiving seat 3 without providing a diaphragm resistance or the like. Therefore, for example, it is possible to give the seismic isolation bearing an impact mitigating capability or improve the seismic isolation bearing damping capability with a simple configuration without adding a component such as an orifice or a valve. As the viscous fluid, other fluids such as silicon fluid and magnetic fluid can be used in addition to oil.

(Third embodiment)
FIG. 6 is a cross-sectional view showing a seismic isolation bearing according to a third embodiment of the present invention. The seismic isolation bearing of the third embodiment is that the spherical coupling chamber 113 is formed at the coupling portion at the upper end of the bearing body 1 and is coupled to the upper seat 2 having the spherical convex portion 203. Different from form. About the seismic isolation bearing of 3rd Embodiment, the same reference number is quoted for the substantially same component as the seismic isolation bearing of 1st Embodiment, and detailed description is abbreviate | omitted.

  FIG. 6 is a cross-sectional view showing a normal state of the seismic isolation bearing, in which the central axes of the upper seat 2, the bearing body 1, and the lower seat 3 are arranged in a straight line. As shown in FIG. 6, the seismic isolation bearing of this embodiment has the connection chamber 113 in which the connection part of the upper end of the support main body 1 has a substantially spherical inner surface. On the other hand, the upper seat 2 has a spherical convex portion 203 which is accommodated in a connection chamber 113 provided in a connection portion at the upper end of the support body 1 and has a substantially spherical surface.

  The connecting portion at the upper end of the support body 1 has a truncated cone-shaped reduced diameter portion 112 connected to the upper end of the cylindrical portion 11, and a connecting chamber 113 is formed on the upper end surface of the reduced diameter portion 112. The connection chamber 113 has a substantially spherical inner surface, and has a maximum inner surface diameter larger than the diameter of the opening that appears on the upper end surface of the reduced diameter portion 112. The upper seat 2 has a disc-shaped flange 201 fixed to the building body, and a truncated cone-shaped inclined surface portion 202 formed coaxially on the lower end surface of the flange 201. A spherical convex portion 203 is integrally formed. The spherical convex portion 203 of the upper seat 2 is formed to have a diameter slightly smaller than the diameter of the connection chamber 113 of the support body 1. In the normal state shown in FIG. 6, the spherical convex portion 203 of the upper seat 2 is accommodated so that the portion with the maximum diameter in the direction perpendicular to the central axis is buried in the connection chamber 113 of the support body 1. In a state where the inner side surface of the connection chamber 113 of the support body 1 and the surface of the spherical convex portion 203 of the upper seat 2 are in contact with each other, the connection portion at the upper end of the support body 1 and the upper seat 2 are connected. Yes.

  On the other hand, the connecting portion at the lower end of the support body 1 has a diameter-enlarged portion 15 connected to the lower end of the cylindrical portion 11 and a concave portion 16 formed on the end surface, as in the first embodiment. An annular end 17 is formed between the edge and the opening edge of the recess 16. Similarly to the first embodiment, the lower seat 3 includes a seat body 31 and a flange 32. The seat body 31 includes a storage chamber 33 that is continuous with the opening on the upper end surface. The accommodation chamber 33 includes a tapered surface 34 of the opening, a diameter-expanded wall surface 35 that continues to the taper surface 34, a convex portion 36 inside the diameter-expanded wall surface 35, a bottom edge of the diameter-expanded wall surface 35, and the convex portion 36. An annular groove 37 is provided between the bottom edge.

  At all times, when the diameter-expanded wall surface 35 of the lower seat 3 and the surface of the enlarged-diameter portion 15 at the lower end of the support body 1 are in contact with each other, the posture of the support body 1 on the lower seat 3 can be stabilized. , Support ability can be demonstrated stably. Further, when the end surface 36a of the convex portion 36 of the lower seat 3 and the bottom surface 16b of the concave portion 16 at the lower end of the support body 1 are in surface contact, stress concentration is prevented and good durability is obtained.

  On the other hand, when the upper seat 2 and the lower seat 3 are displaced in the event of an earthquake or the like, the inner side surface of the connection chamber 113 provided in the connecting portion at the upper end of the support body 1 and the spherical convexity of the upper seat 2 are provided. It slides in a state where the surface of the portion 203 is in contact. Further, the lower end of the support body 1 is slid while the surface of the enlarged diameter portion 15 of the connecting portion at the lower end of the support body 1 and the surface of the enlarged diameter wall surface 35 of the storage chamber 33 of the lower seat 3 are slid. The bottom surface 16b of the concave portion 16 and the end surface 36a of the convex portion 36 of the lower seat 3 roll. The sliding friction between the connection chamber 113 at the upper end of the support body 1 and the spherical convex portion 203 of the upper seat 2, the enlarged diameter portion 15 at the lower end of the support body 1, and the enlarged wall surface 35 of the lower seat 3 A vibration damping effect is obtained by the sliding friction between the two. Further, since the load is transmitted between the connecting portion at the lower end of the support body 1 and the lower seat 3 through the bottom surface 16b of the concave portion 16 and the end surface 36a of the convex portion 36 which are rolling surfaces, surface damage is caused. And good durability is obtained.

  Further, when the connecting portion at the lower end of the support body 1 rotates with respect to the lower receiving seat 3, the sliding between the enlarged wall surface 35 of the lower receiving seat 3 and the enlarged diameter portion 15 of the connecting portion of the supporting body 1. Due to the moving surface, the rolling surface of the bottom surface 16b of the concave portion 16 formed in the connecting portion of the support body 1 is substantially free of slip relative to the rolling surface of the end surface 36a of the convex portion 36 of the lower seat 3. Can bring. Further, the sliding motion between the enlarged diameter wall surface 35 of the lower receiving seat 3 and the enlarged diameter portion 15 of the connecting portion at the lower end of the supporting main body 1 supports the rotation operation of the supporting body 1 with respect to the lower receiving seat 3. The path according to the shape of the bottom surface 16b of the recess 16 included in the connecting portion at the lower end of the main body 1 and the end surface 36a of the protrusion 36 included in the lower seat 3 can be regulated. Therefore, the movement of the building body fixed to the upper seat 2 can be restricted via the upper seat 2 connected to the upper end of the support body 1. As a result, it is possible to regulate and predict the movement of the building body during an earthquake, effectively preventing damage due to excessive displacement of the building body, and preventing appropriate damage according to the predicted movement Measures can be taken.

  When the upper seat 2 and the lower seat 3 take the maximum displacement, as shown in FIG. 7, the annular end 17 of the connecting portion at the lower end of the support body 1 is fitted in the annular groove 37 of the lower seat 3, Further rotation of the support body 1 and the lower seat 3 is restricted by a compressive force acting on the mutual fitting surfaces. Further, the side surface of the cylindrical portion 11 of the support body 1 abuts against the tapered surface 34 of the lower seat 3, and the support body 1 and the lower seat 3 are further rotated by the compressive force acting on these contact surfaces. To regulate. Therefore, this seismic isolation bearing prevents the inconvenience that an excessive moment is generated when restricting the maximum displacement, and provides good durability. Further, when the upper seat 2 and the lower seat 3 take the maximum displacement, the end surface 112a of the reduced diameter portion 112 of the connecting portion at the upper end of the support body 1 comes into contact with the surface of the inclined surface portion 202 of the upper seat 2. Thus, further rotation between the support body 1 and the upper seat 2 is restricted by the compressive force acting on the mutual contact surfaces. Therefore, this seismic isolation bearing prevents the inconvenience that an excessive moment is generated when restricting the maximum displacement, and provides good durability.

  Further, since the spherical convex portion 203 of the upper seat 2 is accommodated so that the maximum diameter portion is buried in the connection chamber 113 of the support body 1, a force including a vertical upward component is applied to the upper seat 2. When acting, the maximum diameter portion of the spherical convex portion 203 is locked to the inner surface of the connection chamber 113. Therefore, separation of the upper seat 2 from the support body 1 can be prevented. Further, the connecting portion at the lower end of the support body 1 is accommodated in the accommodation chamber 33 so that the enlarged diameter portion 15 is in contact with the enlarged diameter wall surface 35 of the lower seat 3. When the is acted, the enlarged diameter portion 15 of the connecting portion at the lower end of the support body 1 is locked to the enlarged diameter wall surface 35 of the lower seat 3, thereby preventing the support body 1 from being separated from the lower seat 3. As a result, this seismic isolation bearing has a retaining effect, and can transmit a force including a vertical upward component acting on the upper seat 2 from the building body to the lower seat 3 via the bearing body 1. .

  In the third embodiment, the upper receiving seat 2 is provided with the spherical convex portion 203, and the connection chamber 113 having a spherical inner surface that accommodates the spherical convex portion 203 is provided at the upper end connecting portion of the support body 1. In addition, a spherical convex portion may be provided in the connecting portion at the upper end of the support body 1, and a connecting chamber having a spherical inner surface for accommodating the spherical convex portion may be provided in the upper seat 2.

  That is, as in the seismic isolation bearing of the modified example shown in FIG. 8, the connection portion at the upper end of the support body 1 includes a truncated cone-shaped reduced diameter portion 112 that is continuous with the upper end of the column portion 11, and the upper end of the reduced diameter portion 112. It has the spherical convex part 115 formed in this. The upper seat 2 has a disc-shaped seat body 205 fixed to the building body, and a connection chamber 206 that opens to the central surface of the seat body 205. The spherical convex portion 115 of the support body 1 is formed to have a diameter slightly smaller than the diameter of the connection chamber 206 of the upper seat 2. In the normal state shown in FIG. 8, the spherical convex portion 115 of the support body 1 is accommodated so that the portion with the maximum diameter in the direction perpendicular to the central axis is buried in the connection chamber 206 of the upper seat 2.

  As shown in FIG. 9, the seismic isolation bearing of this modification is such that the surface of the reduced diameter portion 112 of the support body 1 receives the upper seat 2 when the upper seat 2 and the lower seat 3 are displaced maximum. It contacts the surface of the seat body 205. In addition, the annular end portion 17 of the connecting portion at the lower end of the support body 1 is fitted into the annular groove 37 of the lower receiving seat 3, and the side surface of the cylindrical portion 11 of the supporting body 1 is formed on the tapered surface 34 of the lower receiving seat 3. Abut. The compressive force acting on the contact surface between the surface of the reduced diameter portion 112 of the bearing body 1 and the surface of the seat body 205 of the upper seat 2, the surface of the annular end 17 of the bearing body 1, and the lower seat 3 The compression force acting on the fitting surface with the surface of the annular groove 37 and the compression force acting on the contact surface between the side surface of the cylindrical portion 11 of the support body 1 and the taper surface 34 of the lower seat 3 are supported. Further rotation between the main body 1 and the lower seat 3 can be effectively restricted.

  Moreover, in the said embodiment, although the cyclic | annular taper surface 34 was formed in opening of the lower seat 3, this taper surface 34 does not need to be provided. That is, the diameter-expanded wall surface 35 may be directly connected to the opening of the lower seat 3. In this case, when the upper seat 2 and the lower seat 3 take the maximum displacement, the side surface of the cylindrical portion 11 of the support body 1 does not come into contact with the lower seat 3, so that the support body 1 and the lower seat 3 can be moved further. The rotation restriction is performed only by fitting the annular end 17 of the support body 1 and the annular groove 37 of the lower seat 3. By removing the tapered surface 34, the height of the lower seat 3 can be reduced.

  In the said 1st thru | or 3rd embodiment, although the seismic isolation bearing of this invention was applied to the house as a small-sized building, the seismic isolation bearing of this invention can be applied to buildings, facilities, etc. other than a house. . For example, the seismic isolation bearing of the present invention can be applied to stores, factories, tanks, chemical plant devices, power plant or substation buildings or facilities, bridges, road structures, railway facilities, and the like.

DESCRIPTION OF SYMBOLS 1 Supporting body 2 Upper seat 3 Lower seat 11 Cylindrical part 12,15 Expanded-diameter part 13,16 Concave part 13b, 16b Bottom surface of concave part 23,33 Storage chamber 25,35 Expanded wall surface 26,36 Convex part 26a, 46a Convex part End face of part

Claims (12)

An upper receiving seat, a lower receiving seat, and a support main body having a connecting portion formed at each of an upper end and a lower end so as to be rotatable with respect to the upper receiving seat and the lower receiving seat; Is a seismic isolation bearing formed so that as the horizontal displacement takes place, the connecting part rotates with respect to the upper seat and the lower seat, respectively, and the bearing body is inclined,
Between the upper seat and the connecting portion at the upper end of the support body, a sliding surface is formed that contacts each other and slides when the connecting portion rotates,
Between the lower seat and the connecting portion at the lower end of the support body, a rolling surface that contacts each other and rolls when the connecting portion rotates, and a sliding surface that contacts each other and slides when the connecting portion rotates. A moving surface is formed ,
The connecting portion at the lower end of the support body is rotatably accommodated in the accommodation chamber of the lower seat,
The rolling surface and sliding surface of the connecting portion at the lower end of the support body and the rolling surface and sliding surface of the storage chamber of the lower seat are formed in a rotationally curved shape,
The seismic isolation bearing according to claim 1, wherein the sliding surface of the lower seat has an envelope surface shape drawn when the connecting portion at the lower end of the bearing body rotates . In the seismic isolation bearing according to claim 1,
One of the upper connection portion and the upper seat of the support body has a connection chamber having a substantially spherical inner surface,
The other of the upper connection portion and the upper seat of the support body has a spherical convex portion that is accommodated in the connection chamber and has a generally spherical surface,
The inner side surface of the connecting chamber and the surface of the spherical convex portion are in contact with each other,
The connecting portion at the lower end of the bearing body has a diameter-expanding portion with a maximum diameter in the vicinity of the tip and a surface with a rotating curved surface, and a concave portion formed on the end surface and having a circular bottom surface. And
The lower seat expands from the opening or the vicinity of the opening toward the bottom, and has a rotating curved surface with a maximum diameter near the bottom, and projects from the bottom to the opening side and has a radial contour. A convex portion having a circular end surface, the length of which is substantially the same as the radial contour length of the bottom surface of the concave portion of the coupling portion of the support body, and accommodates the coupling portion at the lower end of the support body. Has a containment chamber,
The bottom surface of the concave portion of the connecting portion at the lower end of the support body and the end surface of the convex portion of the receiving chamber of the lower seat come into contact with each other, the surface of the enlarged portion of the connecting portion at the lower end of the support body, and the lower surface The enlarged wall surface of the receiving chamber of the seat comes into contact,
When the upper seat and the lower seat are displaced, the inner surface of the connection chamber of one of the upper connection portion and the upper seat of the support body, and the upper connection portion and the upper seat of the support body. And the bottom surface of the concave portion of the connecting portion at the lower end of the support body and the end surface of the convex portion of the receiving chamber of the lower seat are substantially in sliding contact with the surface of the spherical convex portion of the other of them. The surface of the enlarged diameter portion of the connecting portion at the lower end of the support body and the enlarged diameter wall surface of the accommodating chamber of the lower seat are in sliding contact with each other,
A seismic isolation system characterized in that when the support body has a maximum displacement angle with respect to the upper seat, the tip of the connecting portion at the lower end of the support body fits with the bottom of the receiving chamber of the lower seat. Support. An upper receiving seat, a lower receiving seat, and a support main body having a connecting portion formed at each of an upper end and a lower end so as to be rotatable with respect to the upper receiving seat and the lower receiving seat; Is a seismic isolation bearing formed so that as the horizontal displacement takes place, the connecting part rotates with respect to the upper seat and the lower seat, respectively, and the bearing body is inclined,
Between the upper receiving seat and the connecting portion at the upper end of the support body and between the lower receiving seat and the connecting portion at the lower end of the support body, they are in contact with each other and roll when the connecting portion rotates. Both a moving surface and a sliding surface that contacts each other and slides when the connecting portion rotates are formed,
When the upper seat and the lower seat take the maximum displacement, the contact position between the rolling surface of the connecting portion at the upper end of the bearing body and the rolling surface of the upper seat in the horizontal direction is the lower end of the bearing body. The contact position between the rolling surface of the connecting portion and the rolling surface of the lower seat is formed so as not to exceed the displacement direction of the upper seat relative to the lower seat ,
The connecting portion at the upper end of the support body is rotatably accommodated in the accommodating chamber of the upper seat, and the connecting portion at the lower end of the support body is freely rotatable in the accommodating chamber of the lower seat. Contained,
The rolling surfaces and sliding surfaces of the upper and lower connecting portions of the support body and the rolling surfaces and sliding surfaces of the upper and lower receiving chambers are formed in a rotationally curved surface shape.
The seismic isolation bearing , wherein the sliding surfaces of the upper seat and the lower seat have an envelope shape drawn when the upper and lower connecting portions of the bearing body rotate . In the seismic isolation bearing according to claim 3,
The connecting portion of the bearing main body has a diameter-expanding portion having a maximum diameter in the vicinity of the tip and a surface having a rotational curved surface, and a recess having a circular bottom surface formed on the end surface. Have
The upper seat and the lower seat are expanded from the opening or the vicinity of the opening toward the bottom, the rotating curved surface having a maximum diameter in the vicinity of the bottom, and a protruding surface from the bottom to the opening side, A convex portion having a circular end surface formed in a radial contour length substantially the same as a radial contour length of a bottom surface of the concave portion of the coupling portion of the support body. Has a storage room for storage,
The bottom surface of the concave portion of the coupling portion of the support body and the end surfaces of the convex portions of the receiving chambers of the upper seat and the lower seat are in contact with each other, the surface of the enlarged diameter portion of the coupling portion of the support body, and the upper The diameter-expanded wall surfaces of the receiving chamber and the lower receiving chamber are in contact with each other.
When the upper seat and the lower seat are displaced, the bottom surface of the concave portion of the connecting portion of the support body and the end surfaces of the convex portions of the receiving chambers of the upper and lower seats are substantially in rolling contact. In addition, the surface of the enlarged diameter portion of the coupling portion of the support body and the enlarged diameter wall surfaces of the upper receiving seat and the receiving chamber of the lower receiving seat are in sliding contact,
When the upper seat and the lower seat take the maximum displacement, the front end of the connecting portion of the support body is fitted to the bottom of the storage chamber of the upper seat and the lower seat, and in the horizontal direction, The contact position between the bottom surface of the concave portion of the connecting portion at the upper end of the support body and the end surface of the convex portion of the receiving chamber of the upper receiving seat is such that the bottom surface of the concave portion of the connecting portion at the lower end of the supporting body and the convexity of the receiving chamber of the lower receiving seat. The seismic isolation bearing is formed so that the contact position with the end face of the part does not exceed the displacement direction of the upper seat relative to the lower seat. In the seismic isolation bearing according to claim 2 or 4,
The upper seat and / or the lower seat has an annular taper surface that is formed between the opening and the diameter-expanded wall surface and decreases in diameter from the opening toward the bottom.
When the upper seat and the lower seat take the maximum displacement, the side surface of the portion between the connecting portion at the upper end and the connecting portion at the lower end of the support body is a tapered surface of the upper seat and / or the lower seat. Seismic isolation bearings characterized in that they contact each other. In the seismic isolation bearing according to claim 2 or 4,
The enlarged diameter wall surface formed in the accommodation chamber of the upper seat and / or the lower seat is expanded when the connecting portion of the support body accommodated in the accommodation chamber formed with the enlarged diameter wall rotates. A seismic isolation bearing having an envelope shape drawn by the surface of the diameter portion. In the seismic isolation bearing according to claim 4,
The bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the storage chamber of the upper and lower receiving seats are arranged as the horizontal displacement of the upper and lower receiving seats increases. Seismic isolation bearing, characterized in that the vertical separation between the seat and the lower seat is increased. In the seismic isolation bearing according to claim 2 or 4,
At least one of the bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the receiving chamber of the upper receiving seat and / or the lower receiving seat for receiving the connecting portion in which the concave portion is formed is more than the peripheral portion. Seismic isolation bearing, characterized in that the central part is formed in a bulging shape. In the seismic isolation bearing according to claim 2 or 4,
The bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the receiving chamber of the upper receiving seat and / or the lower receiving seat for receiving the connecting portion in which the concave portion is formed have a central portion rather than a peripheral portion. Seismic isolation bearings that are formed on the same curved surface that bulges. In the seismic isolation bearing according to claim 2 or 4,
The bottom surface of the concave portion of the connecting portion of the support body and the end surface of the convex portion of the receiving chamber of the upper receiving seat and / or the lower receiving seat for receiving the connecting portion in which the concave portion is formed have a flat central portion and a peripheral portion. Seismic isolation bearings characterized in that they are formed in the same shape with curved surfaces. In the seismic isolation bearing according to claim 2 or 4,
The enlarged-diameter portion formed in the connecting portion of the support body has a small curvature portion and a large curvature portion connected to the distal end side of the small curvature portion, and the upper seat and the lower seat take maximum displacement. The large curvature portion of the enlarged diameter portion is locked to the opening-side end portion of the enlarged wall surface of the upper receiving seat and / or the lower receiving seat that accommodates the connecting portion in which the enlarged diameter portion is formed. Seismic isolation bearing characterized by being formed. In the seismic isolation bearing according to claim 2 or 4,
A seismic isolation bearing, characterized in that a viscous fluid is filled between a connecting portion at a lower end of the bearing body and a receiving chamber of the lower seat.

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