JP2013024298A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation device capable of coping with a long-cycle earthquake vibration and a long-cycle pulse earthquake vibration, effectively preventing layered rubbers from being bent without using a stabilizing board to be disposed by stretching between a plurality of layered rubbers arranged in parallel with each other.SOLUTION: This base isolation device is interposed in a vertical space between an upper structure and a lower structure to support the upper structure in a base isolating state. The base isolation device includes: an outrigger member; and a pair of layered rubbers vertically layered through the outrigger member. The outrigger member includes: a part pinched by the pair of layered rubbers from upper and lower; and an extension part extending from the pinched part to both sides in the horizontal direction. When the upper structure is displaced in the horizontal direction relatively to the lower structure, the layered rubbers are shear-deformed in the horizontal direction, and the extension part of the outrigger member abuts on at least of the upper structure and the lower structure as an object of abutment in a condition wherein the extension part of the outrigger member is allowed to move in the horizontal direction relatively to the upper structure and the lower structure.

Description

  The present invention relates to a seismic isolation device that is interposed in a vertical gap between an upper structure and a lower structure below the upper structure to support the upper structure in a horizontal seismic isolation state.

  Seismic isolation devices that protect buildings 1 from earthquakes are widespread (see FIGS. 1A and 1B). The seismic isolation device has, for example, a laminated rubber 30 interposed between a foundation 2 as a lower structure and a building 1 as an upper structure, and the laminated rubber 30 supports the building 1 so as to be horizontally displaced. To do. According to this seismic isolation device, the seismic isolation period of the building 1 (the vibration period of the building at the time of the seismic isolation) is set to a period (for example, 3 to 3) longer than the dominant period (for example, about 0.2 to 1 second) of the ground motion. The response acceleration of the building 1 can be reduced by making the period longer (about 5 seconds) (see Patent Document 1).

JP 2005-248520 A

  By the way, in recent years, long-period ground motion, such as long-period ground motion or long-period pulse ground motion, or long-period ground motion that can resonate, or the allowable range (design value) of the seismic isolation device. There is concern about the occurrence of ground motion that would cause excessive horizontal deformation to exceed.

  As a method for coping with such earthquake motion, for example, a multi-stage laminated rubber connector 30G in which laminated rubbers 30, 30... Are stacked in N stages (two stages in the illustrated example) as shown in FIG. And according to this multistage laminated rubber coupling body 30G, the seismic isolation cycle of the building 1 can be increased to √N times that of the laminated rubber 30 as shown in FIG. The allowable range of horizontal deformation is also expanded up to N times that when the laminated rubber 30 is one stage. Therefore, it can cope with long-period ground motion and long-period pulse ground motion.

  However, in the above-described multi-layered laminated rubber assembly 30G in which the laminated rubbers 30, 30... Are simply stacked in N stages, the aspect ratio, that is, the ratio between the vertical dimension and the horizontal dimension becomes large. When the horizontal displacement δ of the building 1 is large, the multistage laminated rubber connector 30G is likely to buckle. That is, the connecting portion J30 between the laminated rubbers 30 adjacent to each other on the top and bottom easily rotates in the vertical plane, making it difficult to support the vertical load. As a result, the multi-layer laminated rubber joined body 30G may be buckled.

  Here, as an example of the seismic isolation device capable of solving this buckling problem, there is a device as shown in FIG. 3A. This seismic isolation device spans a stabilizer 100 (or a stable beam) over a plurality of laminated rubbers 30, 30... Arranged in parallel, and a plurality of second-tier laminated rubbers 30, 30. Do it. And according to this seismic isolation device, since laminated rubber 30 and 30 are not connected directly up and down, but are connected via stabilization board 100, with respect to laminated rubber 30 at the time of the horizontal displacement shown in Drawing 3B. A bending return force is applied from the stabilizer 100 in a direction that suppresses rotation in the vertical plane, thereby eliminating the problem of buckling of each laminated rubber 30.

  Further, in the sense that the laminated rubbers 30 and 30 are arranged in series in multiple stages, the seismic isolation device of FIG. 3A is equivalent to the configuration of the multi-stage laminated rubber joined body 30G of FIG. And the allowable range of horizontal deformation of the seismic isolation device is expanded to N times, so that it is possible to cope with long-period ground motion and long-period pulse ground motion.

  However, in general, the laminated rubber 30 should be disposed directly below the pillar 1c (for example, FIG. 4) of the building 1 so that the weight of the building 1 can be directly received. The interval is as wide as about 7m to 10m. Therefore, in order to protect this, the horizontal dimension of the stabilizer 100 described above must also be a large and heavy object corresponding to the interval between the pillars 1c, 1c. As the influence of the vibration mode that becomes an antinode increases, the frequency component of the vibration mode of the earthquake motion is transmitted to the building 1, which may reduce the seismic isolation performance.

  The present invention has been made in view of such conventional problems, and its purpose is to effectively prevent buckling of laminated rubber without using a stabilizing board that is arranged across a plurality of laminated rubber in a parallel state. However, the object is to provide a seismic isolation device that can handle long-period ground motion and long-period pulse ground motion.

In order to achieve this object, the seismic isolation device shown in claim 1 is:
A seismic isolation device interposed in a vertical gap between the upper structure and the lower structure to support the upper structure in a horizontal seismic isolation state,
The seismic isolation device has an outrigger member and a pair of laminated rubbers stacked up and down via the outrigger member,
The outrigger member has a portion sandwiched from above and below between the pair of laminated rubbers, and an extending portion extending from the sandwiched portion to both sides in the horizontal direction,
When the upper structure is displaced relative to the lower structure in the horizontal direction, the laminated rubber undergoes shear deformation in the horizontal direction, and the extended portion of the outrigger member includes the upper structure and the upper structure. It is characterized in that at least one of the upper structure and the lower structure is brought into contact as a structure to be contacted in a state in which relative movement in the horizontal direction with respect to the lower structure is allowed.

  According to the first aspect of the present invention, when the upper structure is displaced relative to the lower structure in the horizontal direction, the laminated rubber is sheared and deformed in the horizontal direction. The protruding portion contacts at least one of the upper structure and the lower structure. Therefore, by this contact, the outrigger member can apply a reaction force from the structure to be contacted and apply a bending return force that suppresses rotation in the vertical plane of the laminated rubber to the laminated rubber. As a result, rotation of the laminated rubber is suppressed, and buckling of the laminated rubber can be prevented.

  Further, the extended portion of the outrigger member comes into contact with the structure to be contacted in a state where relative movement in the horizontal direction is allowed. That is, when the extended portion is in contact with the structure to be contacted, the extended portion is relatively movable in the horizontal direction with respect to the structure to be contacted. Therefore, the abutment state of the upper structure is not greatly impaired by this contact, and the seismic isolation device can swiftly isolate the upper structure horizontally.

  Further, the pair of laminated rubbers are arranged so as to be stacked one above the other. That is, they are arranged in series in the vertical direction. Therefore, the seismic isolation cycle of the upper structure can be expanded as compared with the case where the laminated rubber is one stage, and the allowable range of horizontal deformation of the seismic isolation device can be enlarged as compared with the case where the laminated rubber is one stage. As a result, the seismic isolation device can handle long-period ground motion and long-period pulse ground motion.

The invention shown in claim 2 is the seismic isolation device according to claim 1,
In the reference state in which the upper structure and the lower structure are not displaced relative to each other in the horizontal direction, the pair of laminated rubbers are in a state in which the center of the planes coincide with each other.
According to the second aspect of the present invention, since the pair of laminated rubbers are in a state in which the center of the planes coincide with each other in the reference state in which relative displacement is not performed, The dead weight of the structure acts only as a vertical load, that is, no couple is generated due to the dead weight. Thereby, it is possible to effectively avoid the laminated rubber from rotating in the vertical plane due to the couple factor, and as a result, it is possible to prevent an unnecessary load from acting on the outrigger member in the reference state.

The invention shown in claim 3 is the seismic isolation device according to claim 1 or 2,
In the reference state in which the upper structure and the lower structure are not relatively displaced, the extended portion of the outrigger member does not support the weight of the upper structure,
When the relative displacement is performed, the extension portion supports a part of its own weight of the upper structure.
According to the third aspect of the present invention, since the extension portion of the outrigger member does not support the weight of the upper structure in the reference state, the aged deterioration of the contact portion with the structure to be contacted in the extension portion. Can be suppressed. For example, in the case where the contact part is a rolling element of a rolling support, if the specific part continues to contact the rolling plate with a predetermined pressure while the rolling element is in a rotation stopped state, the specific part is locally damaged (for example, However, the state where the rotation of the rolling element can be stopped is basically the above-described reference state. Therefore, if the weight of the upper structure is not supported in the reference state as described above, the above-described damage can be effectively prevented.

Moreover, according to the seismic isolation device having the above-described configuration, the base isolation operation can be smoothly started, and after the start of the base isolation operation, the rotation of the laminated rubber in the vertical plane can be effectively suppressed. . Details are as follows.
For example, if the extension part of the outrigger member supports a part of the weight of the upper structure in the reference state, the contact part with the structure to be contacted in the extension part is Although the restraining force (for example, frictional force) that restricts the relative displacement in the horizontal direction is generated due to the contact, the above-described configuration does not support its own weight in the reference state. Does not occur. Therefore, the seismic isolation device can smoothly shift to the base isolation operation from the reference state.
On the other hand, at the time of relative displacement after the start of the seismic isolation operation, the extended portion supports a part of the weight of the upper structure. Therefore, the extension part abuts against the structure to be abutted and generates a reaction force in the vertical direction from there, thereby generating a bending back force to counter the rotation in the vertical plane of the laminated rubber that may occur at the time of relative displacement. Can be made. Therefore, buckling of the laminated rubber after the start of the seismic isolation operation can be effectively prevented.

Invention of Claim 4 is the seismic isolation apparatus in any one of Claim 1 thru | or 3, Comprising:
When the upper structure is displaced relative to the lower structure in the horizontal direction, the extended portion of the outrigger member is allowed to move in the horizontal direction relative to the upper structure and the lower structure. In this state, both the upper structure and the lower structure are brought into contact as a structure to be contacted.
According to the fourth aspect of the present invention, the extended portion of the outrigger member abuts both the upper structure and the lower structure during relative displacement. Therefore, it is possible to effectively avoid the problem of horizontal rotation of the outrigger member, which may occur when the extending portion contacts only one of these structures. This will be described later.

The invention shown in claim 5 is the seismic isolation device according to any one of claims 1 to 3,
When the upper structure is relatively displaced in the horizontal direction with respect to the lower structure, the extended portion of the outrigger member contacts the lower structure as a structure to be contacted,
One or more additional portions including a further outrigger member further stacked on the laminated rubber on the outrigger member and another laminated rubber further stacked on the other outrigger member upward. Have
When the relative displacement is performed, the extended portion of the outrigger member of the additional portion is in contact with the outrigger member in a state in which the relative movement in the horizontal direction with respect to the outrigger member positioned below is allowed. To do.
According to the fifth aspect of the present invention, the additional portion has another laminated rubber, and the other laminated rubber is stacked above the pair of laminated rubbers via another outrigger member. ing. That is, they are arranged in series in the vertical direction. Therefore, it is possible to further expand the seismic isolation cycle based on another laminated rubber in the additional part, and further expand the allowable range of horizontal deformation of the seismic isolation device, resulting in long-period ground motion and long-period pulse ground motion. It will be possible to respond with certainty.
Further, the additional portion has another outrigger member, and the extended portion of the other outrigger member is allowed to move relative to the outrigger member positioned below the outrigger member in the horizontal direction. Abut. Therefore, by taking the reaction force in the vertical direction from this contact portion, the other outrigger member can generate a bending return force, and thereby, another laminated rubber in the additional portion or laminated rubber below it can be produced. Rotational deformation in the vertical plane can be suppressed, and as a result, buckling of the laminated rubber can be prevented.

The invention shown in claim 6 is the seismic isolation device according to any one of claims 1 to 3,
When the upper structure is displaced relative to the lower structure in the horizontal direction, the extended portion of the outrigger member contacts the upper structure as a structure to be contacted,
One or more additional portions including another outrigger member further stacked under the laminated rubber under the outrigger member and another laminated rubber further stacked under the another outrigger member downward. Have
When the relative displacement is performed, the extended portion of the outrigger member of the additional portion is in contact with the outrigger member in a state in which the relative movement in the horizontal direction is allowed with respect to the outrigger member positioned above the extended portion. To do.
According to the sixth aspect of the present invention, the additional portion has another laminated rubber, and the other laminated rubber is stacked below the pair of laminated rubbers via another outrigger member. ing. That is, they are arranged in series in the vertical direction. Therefore, it is possible to further expand the seismic isolation cycle based on another laminated rubber in the additional part, and further expand the allowable range of horizontal deformation of the seismic isolation device, resulting in long-period ground motion and long-period pulse ground motion. It will be possible to respond with certainty.
Further, the additional portion has another outrigger member, and the extended portion of the other outrigger member is allowed to move in the horizontal direction with respect to the outrigger member positioned above the outrigger member. Abut. Therefore, by taking the reaction force in the vertical direction from this contact portion, the other outrigger member can generate a bending return force, and thereby, another laminated rubber in the additional portion or laminated rubber above it can be used. Rotational deformation in the vertical plane can be suppressed, and as a result, buckling of the laminated rubber can be prevented.

The invention shown in claim 7 is the seismic isolation device according to any one of claims 1 to 6,
The extending portion is provided so as to surround the laminated rubber positioned inward in the horizontal direction of the extending portion of the pair of laminated rubbers from the side over the entire circumference in the circumferential direction of the laminated rubber. And
The extending portion can be brought into contact with the structure to be contacted over the entire circumference in the circumferential direction.
According to the seventh aspect of the present invention, even if the upper structure and the lower structure are relatively displaced in an arbitrary direction in the horizontal direction, the extended portion of the outrigger member is reacted with the reaction force from the structure to be contacted. Therefore, it is possible to prevent the buckling of the laminated rubber against the relative displacement in any direction in the horizontal direction.

The invention shown in claim 8 is the seismic isolation device according to any one of claims 1 to 4,
The outrigger member has a cross-shaped member having a cross-sectional shape in plan view as a main body,
The intersecting portion of the cross member is a portion sandwiched between the pair of laminated rubbers from above and below,
The cross member has a plurality of legs as the extending portion,
The plurality of legs can be brought into contact with the structure to be contacted.
According to the eighth aspect of the present invention, since the outrigger member is a cross-shaped member, the laminated rubber positioned inside the outrigger member does not need to be completely covered by the outrigger member, that is, it is appropriately outward. Is exposed. Therefore, it becomes easy to perform maintenance and inspection of the laminated rubber. In addition, when an abnormality is detected in the laminated rubber, the laminated rubber can be easily taken out of the outrigger member by passing through the space between the legs of the outrigger member. Only the laminated rubber can be exchanged without removing it from the lower structure, and the maintenance is excellent.

The invention shown in claim 9 is the seismic isolation device according to any one of claims 1 to 8,
The extension part and the structure to be contacted are in contact in a rolling support state.
According to the ninth aspect of the present invention, the extended portion of the outrigger member and the structure to be contacted are in contact in a rolling support state. Therefore, the outrigger member smoothly takes the reaction force of the bending return force that suppresses the buckling of the laminated rubber from the structure to be abutted, and is smoothly relative to the structure to be abutted in the horizontal direction. In other words, the seismic isolation state of the upper structure is not significantly impaired due to the contact between the extended portion and the structure to be contacted. Therefore, the said seismic isolation apparatus can perform horizontal seismic isolation of the upper structure rapidly.

The invention shown in claim 10 is the seismic isolation device according to any one of claims 1 to 8,
The extending portion and the structure to be contacted are in contact in a sliding support state.
According to the tenth aspect of the present invention, the extended portion of the outrigger member and the structure to be contacted are in contact in a sliding support state. Therefore, when the outrigger member moves in the horizontal direction relative to the structure to be contacted while effectively taking the reaction force of the bending return force that suppresses the buckling of the laminated rubber based on this contact. A horizontal frictional force can be generated, and this frictional force can be used as a damping force for horizontal vibration of the upper structure. That is, this seismic isolation device can also function as a friction damper, thereby reducing the number of dampers to be separately installed.

  According to the seismic isolation device of the present invention, long-period ground motion and long-period pulses can be effectively prevented while preventing buckling of the laminated rubber without using a stabilizer placed over a plurality of laminated rubber in parallel. It is possible to provide a seismic isolation device that can handle earthquake motion.

1A and 1B are schematic side views of a conventional seismic isolation device. 2A and 2B are schematic side views of a multi-stage laminated rubber link 30G that can cope with long-period ground motion and the like. 3A and 3B are schematic side views of the seismic isolation device that can avoid the problem of buckling of the laminated rubber 30. It is a schematic side view of the building 1 to which the seismic isolation device 10 of 1st Embodiment was applied. 5A and 5B are schematic side views of the seismic isolation device 10, and FIG. 5C is a CC arrow view in FIG. 5A. 6A is a schematic side view of the seismic isolation device when the main body of the outrigger member 20 is a cross-shaped member 20a ', and FIG. 6B is a view taken along the line BB in FIG. 6A. 7A and 7B are schematic side views of a seismic isolation device 10a according to a modification of the first embodiment. 8A and 8B are schematic side views of the seismic isolation device 10b of the second embodiment, and FIG. 8C is a view taken along the line CC in FIG. 8B. FIG. 9A thru | or FIG. 9C are explanatory drawings, such as the problem of the horizontal rotation which can occur in the seismic isolation apparatus 10 of 1st Embodiment, FIG. 9A and 9B are schematic side views of the seismic isolation apparatus 10, FIG. 9C is a CC arrow view in FIG. 9B. 10A and 10B are schematic side views of the seismic isolation device 10c of the third embodiment. 11A and 11B are schematic side views of a seismic isolation device 10d according to a modification of the third embodiment. 12A and 12B are schematic side views of the seismic isolation device 10e of the fourth embodiment. 13A and 13B are schematic side views of a seismic isolation device 10f according to a modification of the fourth embodiment. 14A and 14B are schematic side views of the seismic isolation device 10g of the fifth embodiment, and FIG. 14C is a graph of vibration energy absorption history characteristics of the seismic isolation device 10g. FIG. 15A is a graph of the vibration energy absorption history characteristics of the seismic isolation device 10h according to the first modification of the fifth embodiment, and FIGS. 15B and 15C are schematic side views of the seismic isolation device 10h. FIG. 16A is a graph of vibration energy absorption history characteristics of the seismic isolation device 10i of the second modification of the fifth embodiment, and FIGS. 16B and 16C are schematic side views of the seismic isolation device 10i. FIG. 17A is a schematic side view of the seismic isolation device 10a ′ in which the rolling bearing 40 of the seismic isolation device 10a (FIG. 7A) of the modification of the first embodiment is replaced with the sliding bearing 50, and FIG. 17B is the second embodiment. It is a schematic side view of seismic isolation apparatus 10b 'which replaced the rolling bearing 40 of the form of the seismic isolation apparatus 10b (FIG. 8A) with the sliding bearing 50. FIG. FIG. 18A is a schematic side view of a seismic isolation device 10c ′ in which the rolling bearing 40 of the seismic isolation device 10c (FIG. 10A) of the third embodiment is replaced with a sliding bearing 50, and FIG. 18B is a modification of the third embodiment. It is a schematic side view of seismic isolation apparatus 10d 'which replaced the rolling bearing 40 of the example seismic isolation apparatus 10d (FIG. 11A) with the sliding bearing 50. FIG. FIG. 19A is a schematic side view of a seismic isolation device 10e ′ in which the rolling bearing 40 of the seismic isolation device 10e (FIG. 12A) of the fourth embodiment is replaced with a sliding bearing 50, and FIG. 19B is a modification of the fourth embodiment. 13B is a schematic side view of a seismic isolation device 10f ′ in which the rolling bearing 40 of the example seismic isolation device 10f (FIG. 13A) is replaced with a sliding bearing 50. FIG.

=== First Embodiment ===
FIG. 4 is a schematic side view of the building 1 to which the seismic isolation device 10 of the first embodiment is applied.
The seismic isolation device 10 is interposed in the vertical gap G between the building 1 as the upper structure and the foundation 2 provided on the ground GND as the lower structure. The weight of the building 1 is supported while allowing the relative displacement δ in the horizontal direction. In this example, a plurality of seismic isolation devices 10, 10... Are arranged in parallel and immediately below the pillars 1 c, 1 c.

  5A and 5B are schematic side views of the seismic isolation device 10, and FIG. 5C is a CC arrow view in FIG. 5A. 5A and 5B, the outrigger member 20 is shown in a central vertical cross-sectional view for the sake of easy understanding of the drawing. This applies to all schematic side views (for example, FIG. 7A, FIG. 7B, FIG. 8A, FIG. 8B...) Used in the following description except for FIG. 6A and FIG. 6B.

  As shown in FIG. 5A, the seismic isolation device 10 includes an outrigger member 20 and a pair of laminated rubbers 30 and 30 stacked up and down via the outrigger member 20. In this example, since the two laminated rubbers 30 and 30 are arranged in series vertically, the seismic isolation period is extended to √2 times that of the laminated rubber 30 in one stage, and The allowable range of horizontal deformation of the seismic device 10 is also expanded to twice.

  The laminated rubber 30 has a well-known configuration. For example, a substantially cylindrical body 31 formed by alternately laminating reinforcing layers and rubber layers, such as circular steel plates, is vertically sandwiched between a pair of upper and lower flange plates 32 and 33. It is fixed. In the illustrated example, the upper laminated rubber 30 and the lower laminated rubber 30 that are a pair of upper and lower laminated rubbers 30 and 30 have the same specifications. However, the present invention is not limited to this. Also good.

  The upper laminated rubber 30 is fixed to the lower surface 1b of the building 1 by the upper flange plate 32 so as not to be relatively movable, and is fixed to the upper surface 22a of the lid portion 22 (described later) of the outrigger member 20 by the lower flange plate 33. ing. Further, the lower laminated rubber 30 is fixed to the lower surface 22b of the lid portion 22 of the outrigger member 20 by the upper flange plate 32 so as not to be relatively movable, and is fixed to the upper surface 2a of the foundation 2 by the lower flange plate 33 so as not to be relatively movable. ing. Therefore, when the building 1 and the foundation 2 are relatively displaced in the horizontal direction δ, the laminated rubbers 30 and 30 shear quickly in the horizontal direction as shown in FIG. 5B while supporting the weight of the building 1. Deform.

  Note that, in the reference state of FIG. 5A in which the relative displacement δ is not made in the horizontal direction, the upper laminated rubber 30 and the lower laminated rubber 30 are in a state in which their plane centers coincide with each other. Therefore, in this reference state, the weight of the building 1 acts on each laminated rubber 30, 30 only as a vertical load, that is, no couple is generated due to the weight. Thereby, it is possible to effectively avoid the laminated rubber 30 from rotating in the vertical plane due to the couple factor, and as a result, it is possible to prevent an unnecessary load from acting on the outrigger member 20 in the reference state. .

  The outrigger member 20 prevents buckling of the laminated rubber 30 that may occur during relative displacement. That is, when the outrigger member 20 is not provided, each laminated rubber 30, 30 is vertically positioned at the position of the flange plates 33, 32 which are the connecting portions J30 of the upper and lower laminated rubbers 30, 30 at the time of relative displacement as shown in FIG. 2B. This causes a buckling as it tries to rotate largely in the plane. At this time, the outrigger member 20 in FIG. 5B has a rotational force opposite to the rotational direction of the laminated rubber 30, 30 (hereinafter also referred to as a bending return force). ) Is applied to each laminated rubber 30 and 30 to prevent buckling.

  As shown in FIG. 5A, the outrigger member 20 having such a function has, for example, a steel covered cylindrical body 20a as a main body, and a lower laminated rubber 30 is disposed between the lower laminated rubber 30 in the horizontal direction (lower portion). The laminated rubber 30 is accommodated with a gap in the horizontal direction that is large enough to allow horizontal shear deformation), and the upper laminated rubber 30 is placed on the upper surface 22a of the lid portion 22 of the covered cylindrical body 20a. It is fixed. Further, the cylindrical portion 24 of the covered cylindrical body 20a has rolling bodies 42, 42... Of the rolling support 40 and cages (not shown) of the rolling bodies 42, 42. The base 2 integrally has a rolling plate (not shown) on which the rolling elements 42, 42. Therefore, in the case of the relative displacement δ shown in FIG. 5B, the outrigger member 20 has the foundation 2 via the rolling elements 42, 42... And the cylindrical portion 24 so as to suppress the rotation in the vertical plane of each laminated rubber 30, 30. From the above, the reaction force of the bending return force can be taken, and this bending return force is applied to each laminated rubber 30, 30 through the lid portion 22, and the buckling of each laminated rubber 30, 30 is Is prevented.

  Further, as described above, when the reaction force is taken from the foundation 2, the outrigger member 20 is in a rolling support state in which the rolling element 42 of the cylindrical portion 24 comes into contact with the rolling plate of the foundation 2 and can roll. Therefore, the outrigger member 20 can smoothly move relative to the foundation 2 in the horizontal direction, and the seismic isolation state of the building 1 is not greatly impaired. Therefore, the seismic isolation device 10 can promptly perform horizontal isolation of the building 1. After the horizontal seismic isolation, the position is quickly restored to the reference state of FIG. 5A, that is, the state without the relative displacement δ, based on the elastic force of the laminated rubber 50, 50.

  Incidentally, the portion 22c on the plane center side of the lid portion 22 of the above-mentioned covered cylindrical body 20a corresponds to a “portion sandwiched between the laminated rubber 30 and 30 from above and below” according to the claims, Both the peripheral side portion 22d and the cylindrical portion 24 correspond to the “extending portion extending from the sandwiched portion to both sides in the horizontal direction” according to the claims (see FIGS. 5A and 5C).

  The shape of the main body of the outrigger member 20 is not limited to the above-described covered cylindrical body 20a. For example, it may be a covered polygonal cylinder (a cross-sectional shape including a triangle or a rectangle is provided with a cover unit integrally on the upper part of a polygonal tube part), or a schematic side view of FIG. 6A. And the cross-shaped member 20a 'which forms a pair of gate-shaped member 21a' in a cross shape as shown in the schematic plan view (BB arrow line view in FIG. 6A) of FIG. 6B may be sufficient. In the case of the cross member 20a ′, the lower laminated rubber 30 is disposed on the lower surface of the intersection portion CP21a ′ between the pair of gate-shaped members 21a ′ and 21a ′, and the upper laminated rubber 30 is disposed on the upper surface of the intersection portion CP21a ′. Further, each leg portion of the gate-shaped member 21a ′ is provided with rolling bodies 42, 42... Of the rolling support 40 and cages (not shown) of the rolling bodies 42, 42. Corresponding to this, the base 2 integrally has a rolling plate (not shown) on which the rolling elements 42, 42.

  Incidentally, in the case where the outrigger member 20 is a covered cylinder 20a such as a covered cylinder 20a or a covered polygonal cylinder, the buckling prevention property of the laminated rubber 30 is superior to the case of the cross member 20a ′. . That is, as shown in FIG. 5A, in the case of the former covered cylindrical body 20a, the lower laminated rubber 30 is located inside the cylindrical portion 24 (in the case of a covered polygonal cylindrical body, a polygonal cylindrical portion). That is, the cylinder part 24 of the covered cylinder 20a is provided so as to surround the laminated rubber 30 from the side over the entire circumference in the circumferential direction. And the rolling elements 42, 42 ... of the lower end edge of the cylinder part 24 are arrange | positioned over the perimeter of the same circumferential direction, and can contact | abut to the rolling plate of the foundation 2 over the said perimeter. Therefore, even if the building 1 and the foundation 2 are relatively displaced in an arbitrary direction in the horizontal direction, the covered cylindrical body 24 that is the main body of the outrigger member 20 takes the reaction force from the foundation 2 to ensure the above bending return force. Therefore, it is possible to reliably prevent buckling of the laminated rubber 30 even with respect to a relative displacement in an arbitrary direction in the horizontal direction.

  Further, as shown in FIG. 5A, in the reference state in which no relative displacement is made in the horizontal direction, the cylinder axis of the cylindrical portion 24 of the outrigger member 20 (the planar center of the cylindrical portion 24) is the planar center of each of the laminated rubbers 30 and 30. If the cylindrical portion 24 is fixed to each laminated rubber 30 and 30 so as to coincide with each other, the reaction force of almost the same magnitude can be taken from the foundation 2 even if the relative displacement is made in the horizontal direction. As a result, the effect of preventing buckling can be evenly exhibited regardless of the direction of relative displacement. This applies to any of the cylindrical portions 24 ", 24" ', 24P of the embodiments and modifications described below.

  7A and 7B are schematic side views of a seismic isolation device 10a according to a modification of the first embodiment. The main difference from the first embodiment described above is the direction of the outrigger member 20. That is, the main body of the outrigger member 20 of the first embodiment is the covered cylindrical body 20a. However, the main body of the outrigger member 20 '' of this modification is vertically inverted from the covered cylindrical body 20a of the first embodiment. This is a bottomed cylindrical body 20a ″. As a result, the outrigger member 20 ″ takes the reaction force of the bending back force from the lower surface 1 b of the building 1 located above (FIG. 7B).

  More specifically, first, on the inner side of the bottomed cylindrical body 20a ″, the upper laminated rubber 30 has a horizontal gap between them (a horizontal gap large enough to allow horizontal shear deformation of the upper laminated rubber 30). The lower laminated rubber 30 is fixed to the lower surface 22b ″ of the bottom 22 ″ of the bottomed cylindrical body 20a ″. Further, the cylindrical portion 24 ″ of the bottomed cylindrical body 20a ″ has rolling elements 42, 42... Of the rolling support 40 and cages (not shown) of the rolling elements 42, 42. Correspondingly, the building 1 integrally has rolling plates (not shown) on which the rolling elements 42, 42. Therefore, the outrigger member 20 ″ moves upward via the rolling elements 42 and the cylindrical portion 24 ″ so as to suppress the rotation in the vertical plane of each laminated rubber 30, 30 at the relative displacement δ shown in FIG. 7B. The reaction force of the above-described bending return force can be taken from the building 1 and the bending return force is applied to each laminated rubber 30, 30 through the bottom portion 22 '', and each laminated rubber 30, 30 is obtained. Buckling is prevented.

  Further, when the reaction force is taken from the building 1 as described above, the outrigger member 20 ″ is a rollable rolling member with the rolling element 42 of the cylindrical portion 24 ″ in contact with the rolling plate of the building 1. Since the outrigger member 20 '' can be smoothly moved relative to the building 1 in the horizontal direction because it is in the supported state, the seismic isolation state of the building 1 is not greatly impaired.

  Incidentally, the portion 22c ″ on the plane center side of the bottom portion 22 ″ of the above-described bottomed cylindrical body 20a ″ corresponds to the “portion sandwiched between the laminated rubber 30, 30 from above and below” according to the claims. In addition, both the peripheral portion 22d ″ and the cylindrical portion 24 ″ of the bottom portion 22 ″ correspond to the “extending portion extending from the sandwiched portion to both sides in the horizontal direction” according to the claims. (See FIG. 7A).

  By the way, the idea of this modification, that is, the idea of taking the reaction force of the bending return force from the upper building 1 may be applied to the outrigger member 20 having the above-described cross member 20a ′ as a main body, In this case, the outrigger member 20 shown in FIGS. 6A and 6B is turned upside down.

=== Second Embodiment ===
8A and 8B are schematic side views of the seismic isolation device 10b of the second embodiment, and FIG. 8C is a view taken along the line CC in FIG. 8B.
As shown in FIG. 8B, the main difference from the first embodiment is that the outrigger member 20 ′ ″ can obtain the reaction force of the bending return force from both the building 1 and the foundation 2. It is in the point. As a result, the problem of horizontal rotation of the outrigger member 20 that can occur when the reaction force is applied from only one of the building 1 and the foundation 2 and the problem of twisting damage of the laminated rubber 30 are avoided.

  First, the problem of horizontal rotation of the outrigger member 20 will be described with reference to FIGS. 9A to 9C. 9A and 9B are schematic side views of the seismic isolation device 10 according to the first embodiment, and FIG. 9C is a CC arrow view in FIG. 9B. In the following description, two directions that are orthogonal to each other in the horizontal direction are referred to as a left-right direction and a front-rear direction.

  For example, as shown in FIG. 9B, when the building 1 is relatively displaced to the right by δ, the laminated rubber 30 and 30 try to rotate clockwise in the vertical plane. At this time, in order to suppress this rotation, The outrigger member 20 takes a reaction force via the right side wall part 24R of the cylindrical part 24 and applies a counterclockwise bending return force to the laminated rubber 30, 30, and the left side wall part 24L of the cylindrical part 24. Do not take reaction force via. Therefore, the frictional force between the rolling element 42 and the rolling plate is exclusively increased at the right side wall 24R and hardly occurs at the left side wall 24L. In such a state, if the building 1 is relatively displaced forward in the front-rear direction (in FIG. 9B, the direction penetrating the paper surface of FIG. 9B), the relative displacement is illustrated in FIG. 9C. As described above, the horizontal force Fh directed forward from the upper laminated rubber 30 acts on the outrigger member 20 so that the outrigger member 20 also moves forward. However, at this time, the right side wall 24R of the cylindrical portion 24 of the outrigger member 20 generates a large frictional force Ff directed rearward due to the reaction force described above, but the left side wall portion 24L where the reaction force is not taken. The frictional force facing rearward is hardly generated. Then, as shown in FIG. 9C, the forward horizontal force Fh acting from the upper laminated rubber 30 and the rearward friction force Ff acting on the right side wall portion 24R become couples and become the outrigger member 20. This causes the outrigger member 20 to rotate horizontally. Further, this horizontal rotation may be transmitted to the upper laminated rubber 30 and the lower laminated rubber 30 to twist and break them.

  In order to prevent this, in the seismic isolation device 10b of the second embodiment shown in FIG. 8B, the left side wall portion 24L ′ ″ receives a reaction force from the building 1 to generate a large frictional force Ff facing the building. As shown in FIG. 8C, this cancels the couple relationship between the large frictional force Ff and the horizontal force Fh of the right side wall 24R ′ ″.

  In more detail, as shown in FIG. 8A, first, the outrigger member 20 ′ ″ includes a cylindrical portion 24 ′ ″ and a plate-shaped partition portion that partitions the internal space of the cylindrical portion 24 ′ ″ up and down. 22 '' '. The upper laminated rubber 30 is accommodated in the space above the partition portion 22 "", and the lower laminated rubber 30 is accommodated in the space below the partition portion 22 "".

  Here, the cylindrical portion 24 ′ ″ has rolling elements 42, 42... Of the rolling support 40 and cages (not shown) of the rolling elements 42, 42. 2 integrally has a rolling plate (not shown) on which the rolling element 42 should roll on its upper surface 2a. In addition, the cylindrical portion 24 ′ ″ has rolling bodies 42, 42... Of the rolling support 40 and cages (not shown) of the rolling bodies 42, 42. The building 1 integrally has a rolling plate (not shown) on which the rolling element 42 should roll on its lower surface 1b.

  Therefore, for example, as shown in FIG. 8B, when the building 1 is relatively displaced to the right by δ, the laminated rubbers 30 and 30 try to rotate clockwise in the vertical plane. The right side wall portion 24R ′ ″ of the cylindrical portion 24 ′ ″ of the outrigger member 20 ′ ″ takes the reaction force of the bending return force from the foundation 2 via the rolling element 42 and the rolling plate at the lower end edge thereof. At the same time, however, the left side wall 24L ′ ″ of the cylindrical portion 24 ′ ″ of the outrigger member 20 ′ ″ also bends back from the building 1 via the rolling elements 42 and rolling plates at the upper edge. Take the reaction force. At this time, the reaction force of the right side wall portion 24R ′ ″ and the reaction force of the left side wall portion 24L ′ ″ are substantially equal to each other, and thus the magnitude of the generated frictional force is also substantially equal to each other. . Therefore, even in this state, even if the building 1 is relatively displaced forward in the front-rear direction (in FIG. 8B, the direction passing through the paper surface of FIG. 8B), the force acting on the outrigger member 20 ′ ″ at that time is 8C, the front horizontal force Fh applied from the upper laminated rubber 30, the rearward frictional force Ff acting on the right side wall 24R ′ ″, and the left side wall 24L ′ ″. The frictional force Ff that faces the acting rearward direction and the frictional force Ff of the right side wall portion 24R ′ ″ and the frictional force Ff of the left side wall portion 24L ′ ″ are approximately the same magnitude. . Accordingly, the couple relationship between the frictional force Ff of the right side wall 24R ′ ″ and the horizontal force Fh is canceled by the frictional force Ff of the left side wall 24L ′ ″, and as a result, the horizontal rotation of the outrigger member 20 ′ ″. Is prevented.

  Incidentally, it goes without saying that when the building 1 is relatively displaced to the left side opposite to the above, the above-mentioned reverse operation is performed. That is, since the laminated rubber 30 tends to rotate counterclockwise in the above-described reverse direction, the outrigger member 20 ′ ″ is bent back from the upper edge of the right side wall portion 24R ′ ″ of the cylindrical portion 24 ′ ″. At the same time, the reaction force for bending back is also taken from the lower end edge of the left wall 24L ′ ″.

  In addition, the portion 22c ′ ″ on the plane center side of the above-described partition portion 22 ′ ″ corresponds to the “portion sandwiched between the laminated rubber 30 and 30 from above and below” according to the claims. Both of the peripheral portion 22c ′ ″ and the cylindrical portion 24 ′ ″ of “″ correspond to the“ extending portion extending from the sandwiched portion to both sides in the horizontal direction ”according to the claims. .

  By the way, the idea of the second embodiment, that is, the idea of taking the reaction force of the bending return force from both the building 1 and the foundation 2 is applied to the outrigger member 20 having the cross member 20a ′ as a main body. May be. And as a structure in that case, with respect to each portal type member 21a 'and 21a' of the outrigger member 20 shown to FIG. 6A and 6B, respectively, a pair of each extended toward the upper direction from the both ends of a horizontal direction Further, each leg has a rolling body 42, 42 ... of the rolling support 40 and a holder (not shown) of the rolling bodies 42, 42 ... on the upper end surface of each leg. Correspondingly, the building 2 integrally has rolling plates (not shown) on which the rolling elements 42, 42.

=== Third Embodiment ===
10A and 10B are schematic side views of the seismic isolation device 10c of the third embodiment. The difference from the first embodiment is in the number of stages in which the laminated rubber 30 is stacked. That is, in the first embodiment, the two laminated rubbers 30 and 30 are stacked in series in the vertical direction, but in the second embodiment, the laminated rubber 30P is further stacked in series in the vertical direction. It has a three-stage configuration. As a result, since the number of the laminated rubbers 30 arranged in series is larger than that in the first embodiment, the seismic isolation cycle is further prolonged, and the allowable range of horizontal deformation of the seismic isolation device 10c is further expanded. ing. Incidentally, one outrigger member 20P is also added corresponding to the additional installation of the laminated rubber 30P.

Hereinafter, the configuration of the seismic isolation device 10c will be described.
As shown in FIG. 10A, this seismic isolation device 10c is obtained by stacking another outrigger member 20P and another laminated rubber 30P one by one on the seismic isolation device 10 of the first embodiment. That is, as the additional portion 15 to the seismic isolation device 10 of the first embodiment, another outrigger member 20P further stacked on the upper laminated rubber 30 of the first embodiment, and the other outrigger member 20P And another laminated rubber 30P further stacked.
Hereinafter, the other outrigger member 20P is referred to as “second-stage outrigger member 20P”, and the other laminated rubber 30P is referred to as “third-stage laminated rubber 30P”. Further, the upper laminated rubber 30 of the first embodiment is referred to as a “second-stage laminated rubber 30”, the lower laminated rubber 30 is referred to as a “first-stage laminated rubber 30”, and the outrigger member 20 This is referred to as “first-stage outrigger member 20”.

  As shown in FIG. 10A, the upper flange plate 32P of the third-tier laminated rubber 30P is fixed to the lower surface 1b of the building 1 so as not to be relatively movable, and the lower flange plate 33P is a lid portion 22P of the second-stage outrigger member 20P. The lower surface 22Pb of the lid portion 22P of the second-stage outrigger member 20P is fixed to the upper flange plate 32 of the second-stage laminated rubber 30 so as not to be relatively movable. .

  Here, the cylindrical portion 24 of the second-stage outrigger member 20 also has a rolling element 42, 42... Of the rolling support 40 and a holder (not shown) of the rolling elements 42, 42. Correspondingly, the lid portion 22 of the first-stage outrigger member 20 integrally has a rolling plate (not shown) on which the rolling element 42 should roll on its upper surface 22a. Therefore, in the case of the relative displacement δ shown in FIG. 10B, the second-stage outrigger member 20P causes the rolling elements to suppress rotation in the vertical plane of the second-stage and third-stage laminated rubbers 30 and 30P. The reaction force of the bending return force can be taken from the first-stage outrigger member 20 through the cylindrical portion 24P and the cylindrical portion 24P, and this bending return force is obtained through the lid portion 22P of the second-stage outrigger member 20P. The buckling of the laminated rubber 30 and 30P is prevented by being applied to the laminated rubber 30 and 30P of the stage and the third stage.

  Further, when the second-stage outrigger member 20P takes a reaction force from the first-stage outrigger member 20 as described above, the second-stage outrigger member 20P has the rolling element 42 of the cylindrical portion 24P as the first-stage outrigger member 20P. The second stage outrigger member 20P is smoothly in the horizontal direction with respect to the first stage outrigger member 20 because the second stage outrigger member 20P is in a rolling support state in which it can contact and roll against the rolling plate of the lid portion 22 of the outrigger member 20. It can move relative to each other, so that the seismic isolation state of the building 1 is not greatly impaired. Therefore, this seismic isolation device 10c can perform horizontal seismic isolation of the building 1 quickly.

  Note that the mechanism by which the buckling of the first-stage and second-stage laminated rubbers 30, 30 is prevented by the first-stage outrigger member 20 is the same as in the first embodiment, and a description thereof will be omitted.

  By the way, as described above, at the time of the relative displacement of δ, the second-stage outrigger member 20P moves in the horizontal direction relative to the first-stage outrigger member 20 due to the shear deformation of the second-stage laminated rubber 30. (See FIG. 10B). Therefore, the upper surface 22a of the lid portion 22 of the first-stage outrigger member 20 is formed wider than in the first embodiment by this relative movement. In this example, for example, the upper end portion of the cylindrical portion 24 of the first-stage outrigger member 20 is provided with a flange portion 25 that continuously extends laterally. Therefore, even if the second-stage outrigger member 20P moves relative to the first-stage outrigger member 20 in the horizontal direction, the second-stage outrigger member 20P slides on the flange 25 and the like of the first-stage outrigger member 20. Thus, the reaction force of the bending back force can be taken from the member 20 without any problem.

  11A and 11B are schematic side views of a seismic isolation device 10d according to a modification of the third embodiment. In this modification, the additional portion 15 (the pair member 15 composed of the outrigger member 20P and the laminated rubber 30P) that is one step in the third embodiment is provided as two steps as an example of a plurality of steps. The contents are the same as in the third embodiment. Therefore, the description is omitted. Needless to say, the number of the additional portions 15 to be installed is not limited to one or two stages, and may be three or more.

=== Fourth Embodiment ===
12A and 12B are schematic side views of the seismic isolation device 10e of the fourth embodiment. In the third embodiment described above, the additional portion 15 composed of the laminated rubber 30P and the outrigger member 20P is additionally provided with respect to the seismic isolation device 10 of the first embodiment, but as shown in FIG. The fourth embodiment is different from the seismic isolation device 10a of the modified example of the first embodiment in that an additional portion 15 '' having a similar configuration is provided. That is, in the fourth embodiment, the additional portion 15 ″ is stacked and provided under the lower laminated rubber 30 of the modified example of the first embodiment, and the lower laminated portion is used as the additional portion 15 ″. Another outrigger member 20P ″ stacked under the rubber 30 and another laminated rubber 30P further stacked under the other outrigger member 20P ″.

  Hereinafter, this other outrigger member 20P ″ is referred to as “first-stage outrigger member 20P ″”, and the other laminated rubber 30P is referred to as “first-stage laminated rubber 30P”. Further, the lower laminated rubber 30 of the modified example of the first embodiment is referred to as a “second laminated rubber 30”, the upper laminated rubber 30 is referred to as a “third laminated rubber 30”, and The outrigger member 20 ″ according to the modification of the first embodiment is referred to as “second-stage outrigger member 20 ″”.

  As shown in FIG. 12A, the lower flange plate 33P of the first-stage laminated rubber 30P is fixed to the upper surface 2a of the base 2 so as not to be relatively movable, and the upper flange plate 32P is a lid portion 22P of the first-stage outrigger member 20P ″. The upper surface 22Pa ″ of the lid portion 22P ″ of the first-stage outrigger member 20P ″ is fixed to the lower surface 22Pb ″ of the second-stage laminated rubber 30 so as not to be relatively movable. It is fixed so that relative movement is impossible.

  Here, the cylindrical portion 24P ″ of the first-stage outrigger member 20P ″ also has rolling elements 42, 42... Of the rolling support 40 and cages (not shown) of the rolling elements 42, 42. Correspondingly, the lid portion 22 '' of the second-stage outrigger member 20 '' has a rolling plate (not shown) to which the rolling element 42 should roll on its lower surface 22b ''. ing. Therefore, in the case of the relative displacement δ shown in FIG. 12B, the first-stage outrigger member 20P ″ has the rolling elements so as to suppress the rotation in the vertical plane of the first-stage and second-stage laminated rubbers 30P, 30. 42 and the cylindrical portion 24P ″, the reaction force of the bending return force can be taken from the second-stage outrigger member 20 ″, and this bending return force can be applied to the first-stage outrigger member 20P ″. It is given to the first-stage and second-stage laminated rubbers 30P, 30 via the lid portion 22P ″, and buckling of these laminated rubbers 30P, 30 is prevented.

  Further, as described above, when the reaction force is taken from the second-stage outrigger member 20 ″, the first-stage outrigger member 20P ″ has the rolling element 42 of the cylindrical portion 24P ″ as the second-stage outrigger. The first stage outrigger member 20P ″ is in contact with the rolling plate of the lid portion 22 ″ of the member 20 ″ so that the first stage outrigger member 20P ″ is in contact with the second stage outrigger member 20 ″. The relative movement can be smoothly performed in the horizontal direction, and the seismic isolation state of the building 1 is not greatly impaired. Therefore, this seismic isolation device 10d can perform horizontal seismic isolation of the building 1 quickly.

  The mechanism by which the buckling of the second-stage and third-stage laminated rubber 30, 30 is prevented by the second-stage outrigger member 20 ″ is the same as in the modification of the first embodiment (FIG. 7B). Since it is the same, the explanation is omitted.

  By the way, at the time of relative displacement as described above, due to the shear deformation of the first-stage laminated rubber 30P, the first-stage outrigger member 20P ″ is relative to the second-stage outrigger member 20 ″ in the horizontal direction. Move (FIG. 12B). Therefore, the lower surface 22 b ″ of the lid portion 22 ″ of the second-stage outrigger member 20 ″ is formed wider than in the modification of the first embodiment by this relative movement. In this example, for example, the lower end portion of the cylindrical portion 24 ″ of the second-stage outrigger member 20 ″ is provided with a flange portion 25 ″ that continuously extends laterally. Therefore, even if the first-stage outrigger member 20P ″ moves relative to the second-stage outrigger member 20 ″ in the horizontal direction, the first-stage outrigger member 20P ″ does not change the second-stage outrigger member 20 ′. The reaction force of the bending back force can be taken from the member 20 '' without any problem by sliding the collar part 25 '' or the like.

  13A and 13B are schematic side views of a seismic isolation device 10f according to a modification of the fourth embodiment. In this modification, an additional portion 15 ″ (a pair member 15 ″ composed of an outrigger member 20P ″ and a laminated rubber 30P) that is one step in the fourth embodiment is provided as two steps as an example of a plurality of steps. The basic contents are the same as in the fourth embodiment. Therefore, the description is omitted. Needless to say, the number of the additional portions 15 ″ is not limited to one or two, but may be three or more.

=== Fifth Embodiment ===
14A and 14B are schematic side views of the seismic isolation device 10g of the fifth embodiment. In the first embodiment described above, the cylindrical portion 24 of the outrigger member 20 is in contact with the building 1 in a rolling support state, but the second embodiment is different in that it contacts in a sliding support state. In addition to the horizontal seismic isolation function of the building 1, the seismic isolation device 10 g is further provided with a function of further attenuating the horizontal vibration of the building 1 by the frictional force Ff in the sliding support state. Since the other points are substantially the same as those in the first embodiment, in the following description, the same components are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 14A, the cylindrical portion 24 of the outrigger member 20 integrally has a friction plate 52 of a sliding support 50 at its lower end edge, and the friction plate 52 slides on the upper surface 2a of the foundation 2. A power sliding plate (not shown) is integrally provided.

  Therefore, at the time of relative displacement in the horizontal direction of the building 1 as shown in FIG. 14B, the friction plate 52 slides in the horizontal direction with respect to the sliding plate while setting the reaction force of the bending back as the vertical drag. A horizontal frictional force Ff is generated on the sliding surface between 52 and the sliding plate. And this acts on the building 1 as a damping force which attenuates the horizontal vibration of the building 1, and the horizontal vibration of the building 1 is suppressed. That is, the energy of horizontal vibration is absorbed by the seismic isolation device 10g.

  FIG. 14C is a graph of the vibration energy absorption history characteristics of the seismic isolation device 10. The horizontal axis is the horizontal relative displacement δ with respect to the foundation 2 of the building 1, and the vertical axis is the horizontal force P applied to the building 1 from the seismic isolation device 10g. In the figure, the P-δ relationship of the seismic isolation device 10g of the fifth embodiment is shown by a solid line.

  In the figure, as a reference, the P-δ relationship in the ideal state where the frictional force Ff of the rolling bearing 40 is zero in the seismic isolation device 10 of the first embodiment is also indicated by a two-dot chain line. However, in the case of the seismic isolation device 10, the horizontal force P is generated solely based on the elastic force of the shear deformation of the laminated rubber 30, 30, so that the P−δ relationship is an upward straight line without hysteresis. It has become.

  On the other hand, the seismic isolation device 10g of the fifth embodiment is obtained by replacing the rolling bearing 40 of the outrigger member 20 of the seismic isolation device 10 of the first embodiment with a sliding bearing 50 as described above. Therefore, the P-δ relationship of the seismic isolation device 10g according to the fifth embodiment is that in which the horizontal force P is changed by the frictional force Ff of the sliding bearing 50 with respect to the relationship of the two-dot chain line in the graph of FIG. 14C. As a result, it is represented by a solid line in the graph.

  Here, as can be seen from FIG. 14C, the magnitude of the frictional force Ff increases with an increase in the relative displacement δ. This is because the force with which the 30 tries to rotate in the vertical plane increases, and the reaction force taken from the foundation 2 increases accordingly. According to the seismic isolation device 10g, since the P-δ relationship has a substantially triangular hysteresis, the seismic isolation device 10g can absorb the energy of horizontal vibration of the building 1 by an amount corresponding to the area.

  Further, as can be seen with reference to FIG. 14C, in this example, the friction force Ff is not generated in the reference state in which the relative displacement δ is zero. And if it becomes like this, the seismic isolation apparatus 10g can transfer to a seismic isolation operation | movement smoothly from a reference state. Incidentally, “no frictional force Ff is generated” is synonymous with “no reaction force is obtained from the foundation 2”, and “no reaction force is obtained” means “outrigger member 20 cylindrical parts 24 do not support the weight of the building 1 ”. Furthermore, “when the relative displacement is performed, the cylindrical portion 24 of the outrigger member 20 takes the reaction force of the bending return force” means that “when the relative displacement δ is applied, the cylindrical portion 24 of the outrigger member 20 is , "Supports part of the weight of building 1".

  In addition, you may set as mentioned above with respect to the seismic isolation device 10, 10a, 10b, 10c, 10d, 10e, 10f of various embodiment using the above-mentioned rolling bearing 40. That is, it may be set so that the cylindrical portion 24 of the outrigger member 20 does not support the weight of the building 1 in the reference state. And if it does in that way, the local damage of the rolling bearing 40 can be prevented effectively. That is, if the rolling element 42 is in a rotation stopped state and the specific portion of the rolling element 42 continues to contact the rolling plate with a predetermined pressure, the specific portion may be locally peeled off. Here, the state in which the rotation of the rolling element 42 can be stopped is basically the above-described reference state. Therefore, if the weight of the building 1 is not supported in the reference state as described above, the above-described local damage can be effectively prevented.

  FIG. 15A is a graph of vibration energy absorption history characteristics of the seismic isolation device 10h according to the first modification of the fifth embodiment. The two-dot chain line represents the ideal P-δ relationship when the frictional force Ff is zero, as in the case of FIG. 14C described above. In the P-δ relationship of the fifth embodiment described above, the sliding bearing 50 of the outrigger member 20 generates the frictional force Ff over the entire region where the relative displacement δ is not zero. In the range where the displacement δ is zero ± δ1 (−δ1 ≦ δ ≦ δ1), the frictional force Ff does not occur, and when the relative displacement δ deviates from the range of zero ± δ1 (that is, −δ1> δ or δ1 <δ). The frictional force Ff is generated. Therefore, the seismic isolation device 10h does not exhibit the horizontal vibration damping effect when the relative displacement δ is within the range of zero ± δ1, but exhibits the damping effect when the relative displacement δ is out of the range of zero ± δ1. .

Such a change pattern of the frictional force Ff is a clearance between the friction plate 52 and the sliding plate of the sliding bearing 50 in the clearance setting of the sliding bearing 50, that is, in a reference state where the relative displacement δ is zero as shown in FIG. 15B. This is realized by providing S. Details are as follows.
First, in the reference state in which the relative displacement δ is zero, the friction plate 52 and the sliding plate do not come into contact with each other based on the gap S, so that the friction force Ff does not occur. For example, as shown in FIG. 15C, when the building 1 is relatively displaced to the right and the relative displacement δ gradually increases, the laminated rubber 30 and 30 rotate clockwise in the vertical plane accordingly. Then, the outrigger member 20 also rotates clockwise in the vertical plane while being pushed by the laminated rubber 30, 30, and thereby slides against the friction plate 52 at the right side wall portion 24 R of the cylindrical portion 24 of the outrigger member 20. On the other hand, the gap S between the friction plate 52 and the sliding plate becomes wider in the left side wall portion 24L. When the relative displacement δ becomes δ1, there is no gap S between the friction plate 52 and the sliding plate at the right side wall portion 24R, and they start to contact each other. A frictional force Ff is generated between the two. When the relative displacement δ is further increased, the reaction force of the right side wall portion 24R is increased, so that the friction force Ff is also increased. Thus, the change pattern of the friction force Ff as described above is realized.
Incidentally, when the building 1 is relatively displaced to the left side opposite to the above, only the reverse operation described above is performed, and thus the description thereof is omitted.

  FIG. 16A is a graph of vibration energy absorption history characteristics of the seismic isolation device 10i of the second modification example of the fifth embodiment. Similarly to FIG. 14C described above, the two-dot chain line represents the P-δ relationship in the ideal state when the frictional force Ff is zero. In the P-δ relationship of the fifth embodiment described above (FIG. 14C), the friction force Ff is not generated in the sliding bearing 50 of the outrigger member 20 in the reference state in which the relative displacement δ is zero. In the modification, as shown in FIG. 16A, the frictional force Ff is generated even in the reference state in which the relative displacement δ is zero. As the relative displacement δ increases from this reference state, the magnitude of the frictional force Ff also increases.

Such a change pattern of the frictional force Ff is realized by preloading the sliding bearing 50 in the vertical direction. FIG. 16B and FIG. 16C are explanatory diagrams of an example of a seismic isolation device 10i capable of applying a preload. In this example, the outrigger member 20 includes a plurality of spring members 60, 60... Such as a disc spring between the lower end edge of the cylindrical portion 24 and the friction plate 52. The plurality of spring members 60, 60... Are arranged at an equal pitch over the entire circumference in the circumferential direction of the cylindrical portion 24. In the reference state where the relative displacement δ is zero, the spring members 60, 60. 60 ... is in a compressed state.
Therefore, even in this reference state, the reaction force is taken from the foundation 2, whereby a frictional force Ff is generated between the friction plate 52 and the sliding plate of the sliding bearing 50. When the building 1 is relatively displaced to the right by δ as shown in FIG. 16C from this reference state, the outrigger member 20 also rotates clockwise as the laminated rubber 30 and 30 rotate clockwise in the vertical plane. Thus, the spring member 60 at the right side wall portion 24R in the cylindrical portion 24 of the outrigger member 20 is further compressed. Therefore, the reaction force taken from the foundation 2 is also increased, and the frictional force Ff is also increased, and thus the change pattern of the frictional force Ff as described above is realized.

By the way, the seismic isolation device 10a (FIG. 7A) of the modified example of the first embodiment exemplified in the form including the rolling bearing 40, the seismic isolation device 10b (FIG. 8A) of the second embodiment, and the immunity of the third embodiment. Seismic isolation device 10c (FIG. 10A), seismic isolation device 10d (FIG. 11A) of the modification of the third embodiment, seismic isolation device 10e (FIG. 12A) of the fourth embodiment, seismic isolation device of the modification of the fourth embodiment 10f (FIG. 13A), it goes without saying that the configuration of the rolling bearing 40 may be replaced with the above-described sliding bearing 50, and in that case, the configuration shown in FIGS. 17A to 19B, respectively. Seismic isolation devices 10a ′, 10b ′, 10c ′, 10d ′, 10e ′, and 10f ′ are obtained.
Furthermore, in the first embodiment, its modification, and the second embodiment, the seismic isolation device (FIGS. 6A and 6B) of the outrigger member 20 having the cross member 20a ′ as a main body is provided with a rolling bearing 40. Although described as a form, in these seismic isolation devices, the configuration of the rolling bearing 40 may be replaced with the above-described sliding bearing 50.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, The deformation | transformation as shown below is possible in the range which does not deviate from the summary.

  In the above-described embodiment, the various seismic isolation devices 10, 10 a... 10 i are interposed in the vertical gap G between the building 1 and the foundation 2, but the present invention is not limited to this. For example, if the building 1 is composed of multiple floors, a seismic isolation device is installed in the vertical gap between the upper floor slab as the upper structure and the lower floor ceiling slab as the lower structure. May be.

  In the above-described embodiment, it has not been described that the damping member that attenuates the horizontal vibration of the building 1 such as an oil damper or a friction damper is installed in the vertical gap G. Needless to say, you can decide.

  In the above-described embodiment, the main body of the outrigger members 20, 20 ″, 20 ′ ″ (for example, the covered cylindrical body 20a, the bottomed cylindrical body 20a ″, the cross member 20a ′, etc.) is made of steel. The material is not limited to this as long as it is a material having rigidity and strength capable of generating a bending return force based on the reaction force taken from the building 1 or the foundation 2, and may be made of concrete, for example.

1 building (upper structure), 1b lower surface, 1c, pillar,
2 foundation (lower structure), 2a upper surface,
10 Seismic isolation device, 10a Seismic isolation device, 10b Seismic isolation device, 10c Seismic isolation device,
10d Seismic isolation device, 10e Seismic isolation device, 10f Seismic isolation device, 10g Seismic isolation device,
10h Seismic isolation device, 10i Seismic isolation device,
10a ′ base isolation device, 10b ′ base isolation device, 10c ′ base isolation device,
10d 'seismic isolation device, 10e' seismic isolation device, 10f 'seismic isolation device,
15 Pair member (additional part), 15 '' Pair member (additional part),
20 Outrigger member, 20a Covered cylindrical body,
22 Lid (part sandwiched, extended part), 22a upper surface, 22b lower surface,
22c The portion of the lid on the center side of the plane (the portion to be sandwiched),
22d Peripheral part (extension part) of the lid part,
24 cylindrical part (extension part),
24R right side wall, 24L left side wall,
20a 'cross member (outrigger member), 21a' portal member,
20 ″ outrigger member, 20a ″ bottomed cylinder,
22 '' bottom (portion and extension),
22c '' portion of the lid on the center side of the plane (portion)
22d ″ The peripheral portion (extending portion) of the lid,
24 '' cylindrical part (extension part),
20 '''outrigger member,
22 '''partition part (part sandwiched, extended part),
22c '''The portion on the center side of the plane of the partition (the portion to be sandwiched),
22d '''part on the peripheral side (extension part) of the partition part,
24 '''cylindrical part (extension part),
24R '''right side wall, 24L''' left side wall,
20P Another outrigger member, 22P Lid (part sandwiched, extended part),
22Pa upper surface, 22Pb lower surface, 24P cylindrical part (extension part), 25 collar part,
20P ″ outrigger member, 22P ″ lid (part sandwiched, extended part),
22Pa ″ upper surface, 22Pb ″ lower surface, 24P ″ cylindrical portion (extension portion),
25 '' buttocks,
30 laminated rubber, 30P another laminated rubber, 31 substantially cylindrical body,
32 upper flange plate, 32P upper flange plate,
33 Lower flange plate, 33P Lower flange plate,
40 rolling bearings, 42 rolling elements,
50 sliding bearings, 52 friction plates,
60 spring member,
G vertical gap, S gap, J30 connecting part CP21a 'intersection, GND ground,

Claims (10)

A seismic isolation device interposed in a vertical gap between the upper structure and the lower structure to support the upper structure in a horizontal seismic isolation state,
The seismic isolation device has an outrigger member and a pair of laminated rubbers stacked up and down via the outrigger member,
The outrigger member has a portion sandwiched from above and below between the pair of laminated rubbers, and an extending portion extending from the sandwiched portion to both sides in the horizontal direction,
When the upper structure is displaced relative to the lower structure in the horizontal direction, the laminated rubber undergoes shear deformation in the horizontal direction, and the extended portion of the outrigger member includes the upper structure and the upper structure. A seismic isolation device, wherein at least one of the upper structure and the lower structure abuts as a structure to be abutted in a state where horizontal relative movement with respect to the lower structure is allowed. The seismic isolation device according to claim 1,
In a reference state in which the upper structure and the lower structure are not displaced relative to each other in the horizontal direction, the pair of laminated rubbers are in a state in which the plane centers of the pair are aligned with each other. Seismic device. The seismic isolation device according to claim 1 or 2,
In the reference state in which the upper structure and the lower structure are not relatively displaced, the extended portion of the outrigger member does not support the weight of the upper structure,
The seismic isolation device according to claim 1, wherein when the relative displacement is performed, the extension portion supports a part of the weight of the upper structure. A seismic isolation device according to any one of claims 1 to 3,
When the upper structure is displaced relative to the lower structure in the horizontal direction, the extended portion of the outrigger member is allowed to move in the horizontal direction relative to the upper structure and the lower structure. The seismic isolation device, wherein both the upper structure and the lower structure are in contact with each other as a structure to be contacted. A seismic isolation device according to any one of claims 1 to 3,
When the upper structure is relatively displaced in the horizontal direction with respect to the lower structure, the extended portion of the outrigger member contacts the lower structure as a structure to be contacted,
One or more additional portions including a further outrigger member further stacked on the laminated rubber on the outrigger member and another laminated rubber further stacked on the other outrigger member upward. Have
When the relative displacement is performed, the extended portion of the outrigger member of the additional portion is in contact with the outrigger member in a state in which the relative movement in the horizontal direction with respect to the outrigger member positioned below is allowed. Seismic isolation device. A seismic isolation device according to any one of claims 1 to 3,
When the upper structure is displaced relative to the lower structure in the horizontal direction, the extended portion of the outrigger member contacts the upper structure as a structure to be contacted,
One or more additional portions including another outrigger member further stacked under the laminated rubber under the outrigger member and another laminated rubber further stacked under the another outrigger member downward. Have
When the relative displacement is performed, the extended portion of the outrigger member of the additional portion is in contact with the outrigger member in a state in which the relative movement in the horizontal direction is allowed with respect to the outrigger member positioned above the extended portion. Seismic isolation device. The seismic isolation device according to any one of claims 1 to 4,
The extending portion is provided so as to surround the laminated rubber positioned inward in the horizontal direction of the extending portion of the pair of laminated rubbers from the side over the entire circumference in the circumferential direction of the laminated rubber. And
The seismic isolation device according to claim 1, wherein the extending portion is capable of contacting the structure to be contacted over the entire circumference in the circumferential direction. The seismic isolation device according to any one of claims 1 to 4,
The outrigger member has a cross-shaped member having a cross-sectional shape in plan view as a main body,
The intersecting portion of the cross member is a portion sandwiched between the pair of laminated rubbers from above and below,
The cross member has a plurality of legs as the extending portion,
The seismic isolation device characterized in that the plurality of leg portions can come into contact with the structure to be contacted. A seismic isolation device according to any one of claims 1 to 8,
The seismic isolation device, wherein the extended portion and the structure to be contacted are in contact in a rolling support state. A seismic isolation device according to any one of claims 1 to 8,
The seismic isolation device, wherein the extended portion and the structure to be contacted are in contact in a sliding support state.