JP2002013313A - Base isolation device for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation device for a building capable of coping with large vertical and horizontal displacement which cannot be coped with by support by rubber elastic bodies. SOLUTION: This device is provided with a first plat 11 placed on a concrete foundation 21, and fixed to the concrete foundation 21 by protruded parts of anchor bolts 22, a second plate 12 disposed to face it, and fixed to a sill 25 by protruded parts of fixing bolts 26 provided through the sill 25 in coaxial directions with the anchor bolts 22, rubber elastic body parts 13, 14 vulcanized and applied between both plates 11, 12, protruded plate parts 16 fixed to either the first plate 11 or the second plate 12 to be protruded toward the other plate 12 or 11, and provided with engagement holes 18a in protruded surfaces, and engagement parts protruded on the other plate 12 or 11 to be inserted into the engagement holes 18a, and engaged with the engagement holes 18a. By engagement of the engagement parts with the engagement holes 18a, vertical and horizontal displacement of the sill 25 is limited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device for a building interposed between a concrete foundation having anchor bolts protruding from the surface thereof and a foundation of the building disposed above the concrete foundation.

[0002]

2. Description of the Related Art Conventionally, as a seismic isolation device of this type, for example, as disclosed in Japanese Patent Application Laid-Open No. 11-62309, an insertion hole is formed at the center in the height direction at the center of an elastic material. An elastic body formed, a rod-shaped body inserted through an insertion hole formed in the elastic body, one disk fixed to the lower surface of the elastic body, and the lower surface installed on the upper surface of the foundation; The other disk, which is fixed to the upper surface of the body and the lower surface of the base is installed on the upper surface, one shaft body that protrudes downward from the lower surface of one disk, and protrudes upward from the upper surface of the other disk The other shaft body inserted through the insertion hole formed in the base, an anchor bolt whose upper end is fixed to one shaft body and buried in the foundation, and fixing means for fixing the other shaft body to the base. What is provided is known. According to this seismic isolation device, since the rod-shaped body is provided at the center of the elastic body, an effect of preventing the elastic body from settling during long-term use can be obtained.

[0003]

However, in the above seismic isolation device, a displacement within an allowable range in the vertical and horizontal directions can be absorbed by an elastic body, but a large displacement exceeding the allowable range is applied. In such a case, no means is provided to deal with this, and it is difficult to prevent the collapse of the building in the case of a large earthquake or the like. SUMMARY OF THE INVENTION An object of the present invention is to provide a seismic isolation device for buildings capable of coping with large vertical and horizontal displacements that cannot be handled by a rubber elastic bearing.

[0004]

In order to achieve the above-mentioned object, the structural feature of the invention according to the first aspect is that a concrete foundation with a tip of an anchor bolt protruding from a surface,
A building seismic isolation device interposed between the foundation of a building and a concrete foundation installed above the concrete foundation. The seismic isolation device is placed on the concrete foundation and fixed to the concrete foundation at the protrusion of the anchor bolt. A first plate, a second plate disposed opposite to the first plate and fixed to a base, and a space portion that is vulcanized and bonded between the first and second plates and opens to the outside. A rubber elastic body provided with
A stopper mechanism is provided in the space to limit the displacement of the base in the vertical and horizontal directions. In addition, the foundation of the building includes a floor panel of a steel-framed house, a floor base of a building by a two-by-four construction method, and the like, in addition to the foundation of the building by the normal construction method, and the like.

In the invention according to the first aspect, the rubber elastic body is bonded between the first and second plates by vulcanization molding. The strength and durability against small vertical and horizontal displacements applied to the first and second plates of the device are ensured. Also, with respect to a large vertical and horizontal displacement applied to the first and second plates of the seismic isolation device due to a large shaking of the concrete foundation, the stopper mechanism can mechanically suppress the displacement within a predetermined range. it can. Further, the stopper mechanism is provided in the space portion within the rubber elastic body portion and does not protrude to the outside, and is formed compactly.

[0008] The structural feature of the invention according to claim 2 is that the anchor bolt is interposed between a concrete foundation whose tip protrudes from the surface and a foundation of a building disposed above the concrete foundation. A seismic isolation device for a building, comprising: a first plate mounted on a concrete foundation and fixed to the concrete foundation at a projecting portion of an anchor bolt; and a first plate disposed opposite to the first plate; A second plate fixed to the base at a protrusion of a fixing bolt provided through the base in a direction coaxial with the anchor bolt;
A rubber elastic body portion vulcanized and bonded between the second and second plates; and a fixing portion fixed to one of the first and second plates and protruding toward the other plate. And an engaging portion projecting from the other plate and inserted into the engaging hole and capable of engaging with the engaging hole. The engaging portion engages with the engaging hole. Thus, a stopper member for limiting displacement of the base in the vertical and horizontal directions is provided.

In the invention according to the second aspect, the rubber elastic body is bonded between the first and second plates by vulcanization molding, so that the base is seismically isolated by small shaking of the concrete foundation. The strength and durability against small vertical and horizontal displacements applied to the first and second plates of the device are ensured. In addition, when the concrete foundation is greatly shaken, a large vertical and horizontal displacement applied to the first and second plates of the seismic isolation device causes the engaging portion of the stopper member to engage with the engaging hole of the projecting plate portion. By combining, further displacement can be mechanically prevented.

According to a third aspect of the present invention, in the seismic isolator for a building according to the second aspect, either one of the plate side provided with the protruding plate portion or the engaging portion is provided. And the other of the engagement side and the plate on which the protruding plate portion is provided is in contact with the curved convex portion. Accordingly, since the other side of the plate provided with the protruding plate portion or the engaging portion is in contact with the curved convex portion, the friction of the contact portion can be reduced, and the lateral movement can be performed smoothly.

According to a fourth aspect of the present invention, in the seismic isolation device for a building according to the second aspect, the rubber elastic body has a laminated structure of a rubber layer and a metal plate. There is to be.

The structural feature of the invention according to claim 5 is that an anchor bolt is interposed between a concrete foundation having a tip protruding from the surface and a foundation of a building disposed above the concrete foundation. A seismic isolation device for a building, comprising: a first plate mounted on a concrete foundation and fixed to the concrete foundation at a projecting portion of an anchor bolt; and a first plate disposed opposite to the first plate; A second plate fixed to the base at a protrusion of a fixing bolt provided through the base in a direction coaxial with the anchor bolt;
Alternatively, a protruding plate portion fixed to one of the second plates and protruding toward the other plate and having an engaging hole on the protruding surface; A stopper member that includes an engagement portion that can be inserted and engageable with the engagement hole, and the vertical and horizontal displacement of the base is limited by the engagement portion engaging with the engagement hole; The rubber elastic body portion vulcanized and bonded is provided between the one plate side of the stopper member and the engaging portion.

In the invention according to claim 5 constructed as described above, since the rubber elastic body is bonded by vulcanization molding between the one plate side of the stopper member and the engaging portion, the concrete base is small. The strength and durability against small vertical and horizontal displacements applied to the first and second plates of the seismic isolation device due to the shaking are ensured. In addition, when the concrete foundation is greatly shaken, a large vertical and horizontal displacement applied to the first and second plates of the seismic isolation device causes the engaging portion of the stopper member to engage with the engaging hole of the projecting plate portion. By combining, further displacement can be mechanically prevented.

According to a sixth aspect of the present invention, in the seismic isolator for a building according to the fifth aspect, the rubber elastic body has a laminated structure of a rubber layer and a metal plate. There is to be.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a building interposed between a concrete foundation and a building base. FIG. 2 is a partial sectional view showing a use state of a seismic isolation device (hereinafter, referred to as seismic isolation device). FIG. 2 is a perspective view showing a protruding plate portion which is a part of a stopper member of the seismic isolation device. It is a thing. As a building, besides ordinary houses,
Store, contains a collection housing, such as apartments, the site area is intended for those of 1000m ² below. The foundation of a building includes a floor panel of a steel-framed house, a floor substrate of a two-by-four construction method, and the like, in addition to a foundation of a building by a normal construction method, and so on.

The seismic isolation device 10 includes a first plate 11 which is a rectangular metal plate opposed to and parallel to each other.
And a second plate 12. Both plates 1
1 and 12 are provided with through holes (not shown) at central positions. Block-shaped rubber elastic portions 13 and 14 are bonded to both sides in the longitudinal direction of the plates 11 and 12 by vulcanization molding to elastically connect the plates 11 and 12 to each other. Rubber elastic body parts 13 and 14 of first plate 11
Between them, a protruding plate portion 16 constituting the stopper member 15 is provided. The protruding plate portion 16 is, as shown in FIG.
It is formed by bending a thin metal plate, has a rectangular cylindrical shape, and has a through hole 17a through which an anchor bolt 22 to be described later is inserted at the center of one flat plate portion 17, and the other flat plate portion 18 opposed thereto. Is provided with an engagement hole 18a through which a fixing bolt 26 described later is inserted with a predetermined width from one end in the axial direction toward the center.

The seismic isolation device 10 is interposed between the concrete foundation 21 and a position near the column 28 of the foundation 25 of the building. An anchor bolt 22 is buried in the concrete foundation 21, and a screw portion 22a at one end thereof protrudes from the concrete foundation. In the seismic isolation device 10, the first plate 11 is placed on a concrete foundation 21, and its through hole is inserted into the screw portion 22 a. Further, the second plate 12 of the seismic isolation device 10 is in close contact with the lower surface of the base 25. A fixing bolt 26 hanging down through the base 25 is inserted into the through hole. The upper end of the fixing bolt 26 is fixed by a nut 27 a on the upper surface of the base 25, and further, the nut 2 is fixed at the position of the second plate 12.
7b, and is extended to a position near the anchor bolt 22.

Further, a through hole 17a of the protruding plate portion 16 is inserted into the screw portion 22a, and a nut 23 is screwed into the screw portion 22a. Fixed on top. Also,
The lower end of the fixing bolt 26 is provided with the engaging hole 18 of the projecting plate 16.
a, and the distal end through which the engagement hole 18a is inserted,
A flat engagement piece 26a is fixed at right angles to the axis. The engaging piece 26a forms an engaging portion of the stopper member 15 together with the fixing bolt 26.

In the first embodiment configured as described above, since the rubber elastic portions 13 and 14 are bonded between the first and second plates 11 and 12 by vulcanization molding, the concrete foundation 21 is formed. The strength and durability against small vertical and horizontal displacements applied to the seismic isolation device 10 due to the small shaking are ensured. Further, in response to large vertical and horizontal displacements applied to the seismic isolation device 10 due to large shaking of the concrete foundation 21, a fixing bolt 26 which is an engaging portion of the stopper member 15 and a lock provided at the tip of the fixing bolt 26. By engaging the engagement piece 26a with the engagement hole 18a of the protruding plate portion 16, further displacement can be mechanically prevented. As a result, seismic isolation device 1
Since large vertical and horizontal displacements applied to zero can be mechanically prevented, collapse of the building can be prevented. Further, the stopper member 15 is provided with the rubber elastic body 1.
Since it is provided in the space between 3 and 14 and does not protrude to the outside and is formed compactly, there is no sense of incongruity when viewed from the outside, giving a sense of security to the user of the building.

As a modification of the first embodiment, as shown in FIG.
A may be attached to the second plate 12, and the engagement portion 22 </ b> A may extend from the anchor bolt 22 of the first plate 11.

Next, a second embodiment will be described. In the present embodiment, as shown in FIG. 4, the second plate 12 is used as the stopper member 31 of the seismic isolation device 30.
Are provided with an anchor bolt 33 protruding from the concrete foundation 21 as an engaging portion, and an engaging piece 33a fixed to the tip thereof.
A curved convex portion 34 projecting hemispherically was provided on the surface facing the second anchor bolt 33. In addition, concrete foundation 21
In the state where the seismic isolation device 30 is mounted between the base plate 25 and the base 25, the engaging piece 33 a fixed to the tip of the anchor bolt 33 is brought into contact with the curved convex portion 34. Other configurations are the same as those of the seismic isolation device shown in the first embodiment, and a description thereof will be omitted.

In the second embodiment having the above configuration, the curved convex portion 34 provided on the protruding plate portion 32 is
Is in contact with the engagement piece 33a fixed to the tip of the rim, the friction of the contact portion can be reduced, and the movement in the horizontal direction is performed smoothly. Therefore, the spring ratio in the vertical direction is not limited. , The spring characteristics suitable for the horizontal direction can be obtained. Further, a curved convex portion 34 provided on the projecting plate portion 32
Since the engaging piece 33a fixed to the tip of the anchor bolt 33 is in contact with the anchor bolt 33, it is possible to prevent the rubber elastic body from being set due to long-term use of the seismic isolation device 30.

It should be noted that, in the above embodiment and modified examples,
One end of the engaging hole 18a of the protruding plate portion 16 constituting the stopper member is open. However, after the fixing bolt 26 is inserted, a small piece may be fixed to the open end by welding or the like and closed. Thereby, the stopper member can perform a stopper function for displacement in all directions in the horizontal direction.

The stopper members shown in the above-described embodiments and modified examples use an anchor bolt and a fixing bolt. However, the present invention is not limited to this, and various other types of stopper structures are possible. For example, as a stopper structure for stopping displacement in one direction in the vertical and horizontal directions, U
A combination of a U-shaped member and an L-shaped member fixed to both plates 11, 12 and a combination of a U-shaped member and a U-shaped member fixed to both plates 11, 12 are possible. is there. Also, as a stopper structure for stopping displacement in all directions in the vertical direction and the horizontal direction, a pair of U-shaped members fixed to both plates and combined, or a perforated U-shaped member and a perforated steel plate are divided. A combination of a pin and the like is possible.

For the formation of these stopper structures, a method in which both members are attached to both plates in advance and are integrally formed at the time of vulcanization molding of the rubber elastic body portion to the plate, and after the rubber elastic body portion is vulcanized to the plate. , A method of fixing both members to the plate and integrating them, a vulcanized molded product of the plate and the rubber elastic body and both members are separately prepared, and both are used as a foundation and a concrete foundation during construction of a building. There is a method of integrating when fixing. As for the attachment of the member to the plate, fixing by welding, fixing with a bolt, pin or split pin, wire, or the like is possible, or a method of simultaneously forming the plate and the member integrally is also possible. Further, the shape of the rubber elastic body portion with respect to the stopper member is not limited to the shape in which the rubber elastic body sandwiches the stopper member, but may be configured so as to surround the stopper member and open at one location. In addition, the configuration of the stopper member will not be described one by one, but can be implemented in various forms as needed.

Next, a third embodiment will be described. The seismic isolation device 40 of the present embodiment, as shown in FIG.
A first protruding plate portion 41 serving also as a first plate placed on the concrete foundation 21, and a second protruding plate portion 46 serving also as a second plate fixed to the foundation 25 of the building and protruding in the direction of the concrete foundation. And a rubber elastic body 49 connecting the first projecting plate 41 and the second projecting plate 46.

As shown in FIG. 7 (a), the first protruding plate portion 41 is a rectangular cylindrical body formed by bending a thin metal plate, and the both side plates 42 are positioned substantially at the center in the height direction. The step portion 42a is narrowed from both sides in the width direction, and has a lower wide portion and an upper narrow portion with the step portion 42a as a boundary. The upper plate 43 projects slightly outward from both narrow portions. Further, a rubber thin plate 45 for non-slip is fixed to the outer surface of the bottom plate 44 as the first plate. The bottom plate 44 and the thin rubber plate 45 are provided with mounting holes 44a cut from one end in the longitudinal direction.

As shown in FIG. 7 (b), the second protruding plate portion 46 is formed by bending a thin metal plate, and has a substantially U-shaped and same length as the first protruding plate portion 41. The upper plate 4 is bent at a right angle to the side plate at the open end side (lower side in the figure) of both side plates 47 and protrudes in the opposite direction.
3 is provided with an engagement piece 47a that can be engaged with the protruding portion.
The first protrusion 41 and the second protrusion 46 are connected to the first protrusion 41.
A part of the narrow portion and the upper plate 43 are inserted into the second protruding portion 46 and are arranged in parallel and opposed to each other.

A rubber elastic portion 49 is provided between the upper plate 48 as the second plate and the upper plate 43 of the first projecting plate portion 41 by vulcanization molding. The first protruding plate portion 41 and the second protruding plate portion 46 by the portion 49
The space is elastically connected. The upper plate 48 and the rubber elastic portion 49 are provided with mounting holes 48 cut from one end in the longitudinal direction.
a is provided. In the seismic isolation device 40, the upper plate 43 and the step portion 42a of the first projecting plate portion 41 and the side plate 4
The narrow portion 2 and the engaging piece 47a of the second protruding plate 46 constitute a stopper member.

In the seismic isolation device 40, the first protruding plate portion 41 is placed on the concrete foundation 21, the screw portion 22a of the anchor bolt 22 is inserted into a mounting hole 44a cut from one end in the longitudinal direction, and a nut is inserted. 23 is fixed to the concrete foundation 21 by screwing. Also, the second protruding plate portion 4
6 is fixed to the base 25 by tightening the nut 27a on the base 25 side with the mounting hole 48a cut from one end in the longitudinal direction engaged with the nut 27b of the fixing bolt 26 protruding from the base 25. You.

In the third embodiment configured as described above, a rubber elastic portion 49 is formed between the upper plate 43 of the first protruding plate portion 41 and the upper plate 48 of the second protruding plate portion 46 by vulcanization molding. Due to the bonding, the strength and durability against small vertical and horizontal displacements applied to the seismic isolation device 40 due to small shaking of the concrete foundation 21 are ensured. Further, in response to large vertical and horizontal displacements applied to the seismic isolation device 40 due to large shaking of the concrete foundation 21, the upper plate 43 and the step portion 42a and the side plate 42 of the first projecting plate portion 41 constituting the stopper member. The engagement piece 47a of the second protruding plate portion 46 engages with the narrow portion of
Further displacement can be mechanically prevented. As a result, large vertical and horizontal displacements applied to the seismic isolation device 40 can be mechanically prevented, so that the building can be prevented from collapsing. Furthermore, in the present embodiment, the upper plate 43 of the first protruding plate portion 41 and the second protruding plate portion 46
By providing the rubber elastic body portion 49 between the upper plates 48,
The size of the seismic isolation device can be made smaller than that provided on both the outside of the protruding plate portion 16 constituting the stopper member.

As a modification of the third embodiment, as shown in FIG. 6, the first projecting plate portion 41 of the seismic isolation device is mounted on the base 2.
5, the second projecting plate portion 46 may be fixed to the concrete foundation 21 with the anchor bolt 22.

In the third embodiment and the modified example, both ends of both side plates 47 of the second protruding plate portion 46 constituting the stopper member are open, but the first protruding plate portion 41 is opened.
After aligning the second protruding plate portion 46 and the vulcanization molding of the rubber elastic body portion 49, small pieces can be fixed to both end sides of the both side plates 47 by welding or the like and closed. Thereby, the stopper member can perform a stopper function for displacement in all directions in the horizontal direction. In addition, the third
The configuration of the stopper member shown in the embodiment and the modified example is not limited to this, as long as a large vertical and horizontal displacement applied to the seismic isolation device can be suppressed within a predetermined range. Good.

In the first, second, and third embodiments and the modified examples, the rubber elastic body portion may have a laminated structure in which rubber and a metal plate are alternately laminated vertically. By forming the rubber elastic body portion to have a laminated structure, a spring characteristic suitable for the horizontal direction can be obtained without being limited by the vertical spring ratio of the rubber elastic body. In addition, with the laminated structure, it is possible to suppress the set of the rubber elastic portion due to long-term use of the seismic isolation device.

In addition, what is shown in the above embodiment is an example, and various modifications can be made without departing from the gist of the present invention.

[0034]

According to the first aspect of the present invention, a large vertical and horizontal displacement applied to the seismic isolation device is mechanically prevented by the stopper mechanism to a displacement within a predetermined range. Because it can be suppressed, the collapse of the building can be prevented. Further, since the rubber elastic body portion is bonded by vulcanization molding, strength and durability against small vertical and horizontal displacements applied to the seismic isolation device are ensured.
Further, since the stopper mechanism is provided in the space portion in the rubber elastic body portion and does not protrude to the outside, and is formed compactly, there is no sense of incongruity as seen from the outside, giving a sense of security to the user of the building.

According to the second aspect of the present invention, the engaging portion of the stopper member engages with the engaging hole of the protruding plate portion.
Since large vertical and horizontal displacements applied to the seismic isolation device can be mechanically prevented, the building can be prevented from collapsing. Further, since the rubber elastic body portion is bonded by vulcanization molding, strength and durability against small vertical and horizontal displacements applied to the seismic isolation device are ensured.

Further, according to the third aspect of the present invention, since the plate on which the protruding plate portion is provided or the other of the engaging portion is in contact with the curved convex portion, the friction of the contact portion can be reduced. Since the mutual movement in the horizontal direction is performed smoothly, the spring characteristics suitable for the horizontal direction can be obtained without being limited by the spring ratio in the vertical direction. Furthermore, since the other side of the plate provided with the protruding plate portion or the engaging portion abuts on the curved convex portion, it is possible to prevent the rubber elastic body portion from settling due to long-term use of the seismic isolation device.

According to the fourth aspect of the present invention, since the rubber elastic portion has a laminated structure, a spring characteristic suitable for the horizontal direction can be obtained without being limited by the spring ratio in the vertical direction. . In addition, since the laminated structure is used, it is possible to prevent the rubber elastic portion from being set due to long-term use of the seismic isolation device.

According to the fifth aspect of the present invention, since the engaging portion of the stopper member is engaged with the engaging hole of the projecting plate portion, a large vertical and horizontal displacement applied to the seismic isolation device is provided. Can be prevented mechanically, so that the building can be prevented from collapsing. Further, since the rubber elastic body portion is bonded by vulcanization molding, strength and durability against small vertical and horizontal displacements applied to the seismic isolation device are ensured. Further, by providing the rubber elastic body portion between the one plate side and the engaging portion, the size of the seismic isolation device can be made smaller than that provided on both the outside of the projecting plate portion constituting the stopper member. . In addition, since the rubber elastic body portion has a laminated structure, it is possible to obtain a spring characteristic suitable for the horizontal direction without being limited by the spring ratio in the vertical direction,
Further, it is possible to prevent the rubber elastic body from sagging due to long-term use of the seismic isolation device (the effect of the invention of claim 6).

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view schematically illustrating a use state of a building seismic isolation device interposed between a concrete foundation and a building base according to an embodiment of the present invention.

FIG. 2 is a perspective view schematically showing a protruding plate part forming a stopper member of the seismic isolation device.

FIG. 3 is a partial cross-sectional view schematically showing a usage state of a building seismic isolation device interposed between a concrete foundation and a building base as a modification.

FIG. 4 shows in detail a stopper member of the seismic isolation device according to the second embodiment.

FIG. 5 is a partial cross-sectional view schematically showing a usage state of a building seismic isolation device interposed between a concrete foundation and a building base according to a third embodiment.

FIG. 6 is a partial cross-sectional view schematically showing a usage state of a building seismic isolation device interposed between a concrete foundation and a building base as a modification.

FIG. 7 is a perspective view schematically showing a first protruding plate portion and a second protruding plate portion of the building seismic isolation device according to the third embodiment and modifications.

[Explanation of symbols]

10 seismic isolation device, 11 first plate, 12 second plate, 13, 14 rubber elastic body, 15 stopper member, 16 projecting plate portion, 18a engagement hole, 21 concrete foundation, 22 ... anchor bolt, 25 ... base, 26 ...
Fixing bolt, 26a ... engagement piece, 30 ... seismic isolation device, 31 ...
Stopper member, 32 projecting plate portion, 33 anchor bolt, 33a engaging piece, 34 curved convex portion, 40 seismic isolation device, 41 first projecting plate portion, 46 second projecting plate portion, 47a
… Engaging piece, 48… upper plate, 49… rubber elastic part.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shusuke Takemori 8th YM Building 1F, 120 Block, Seinencho, Kanazawa-shi, Ishikawa Pref.

Claims (6)

[Claims] 1. A building seismic isolation device interposed between a concrete foundation having a tip of an anchor bolt protruding from a surface and a foundation of a building disposed above the concrete foundation, A first plate mounted on a concrete foundation and fixed to the concrete foundation at a protrusion of the anchor bolt; a second plate disposed opposite to the first plate and fixed to the base; A plate, a rubber elastic member having a space that is vulcanized and bonded between the first and second plates and that opens to the outside, and is disposed in the space, and is arranged in a vertical direction and a horizontal direction of the base. A seismic isolation device for buildings, comprising a stopper mechanism for restricting displacement of the building. 2. A seismic isolation device for a building interposed between a concrete foundation having a tip of an anchor bolt protruding from the surface and a foundation of a building disposed above the concrete foundation, A first plate mounted on a concrete foundation and fixed to the concrete foundation at a projecting portion of the anchor bolt; a first plate disposed opposite to the first plate, the base being coaxial with the anchor bolt; A second plate fixed to the base with a protrusion of a fixing bolt provided therethrough; a rubber elastic body portion vulcanized and bonded between the first and second plates; Alternatively, a protruding plate portion fixed to one of the second plates and protruding toward the other plate, and provided with an engaging hole on a protruding surface; While passing through the hole A stopper member that is configured to be engageable with the engagement hole, and that limits the vertical and horizontal displacement of the base by engaging the engagement portion with the engagement hole. A seismic isolation device for buildings. 3. A curved surface convex portion is provided on one of the plate side on which the protruding plate portion is provided and the engaging portion, and the other of the plate side on which the protruding plate portion is provided or the engaging portion is provided. The seismic isolation device for a building according to claim 2, wherein the seismic device is in contact with the curved convex portion. 4. The seismic isolation device for a building according to claim 2, wherein the rubber elastic body has a laminated structure of a rubber layer and a metal plate. 5. A seismic isolation device for a building interposed between a concrete foundation having a tip of an anchor bolt protruding from a surface and a foundation of a building disposed above the concrete foundation, A first plate mounted on a concrete foundation and fixed to the concrete foundation at a projecting portion of the anchor bolt; a first plate disposed opposite to the first plate, the base being coaxial with the anchor bolt; A second plate fixed to the base with a protrusion of a fixing bolt provided therethrough, and fixed to one of the first or second plate and directed toward the other plate. A protruding plate portion having an engaging hole on the protruding surface, and an engaging portion projecting from the other plate and inserted into the engaging hole and capable of engaging with the engaging hole. And the engaging portion is an engaging hole. A stopper member that limits vertical and horizontal displacements of the base by engaging with the rubber member; and a rubber elastic body portion that is vulcanized and bonded between the one plate side of the stopper member and the engaging portion. A seismic isolation device for buildings, characterized by the provision of: 6. The seismic isolation device for a building according to claim 5, wherein the rubber elastic body has a laminated structure of a rubber layer and a metal plate.