JP7032989B2 - Seismic isolation system and seismic isolation structure - Google Patents

Description

The present invention relates to a seismic isolation system and a seismic isolation structure.

Conventionally, in order to prevent the vibration of an earthquake from being transmitted to a building structure, the building structure is lengthened to reduce the seismic energy, or to absorb the seismic energy, seismic isolation such as laminated rubber bearings and elastic sliding bearings. The device is widely used.

For example, Patent Document 1 discloses the following slip bearing seismic isolation device. The sliding bearing seismic isolation device is equipped with an elastic sliding bearing and a vertical rigidity adjusting mechanism for adjusting the vertical rigidity. The vertical rigidity adjusting mechanism includes a laminated rubber provided so as to overlap the elastic sliding bearing in the vertical direction and on which the load of the superstructure acts, and a horizontal restraint portion provided so as to surround the laminated rubber. The horizontal restraint part allows vertical deformation of the laminated rubber and restrains the horizontal deformation. Therefore, in the event of a large-scale earthquake, the slip material slides on the slip material and seismic isolation is provided. The device acts as an elastic sliding bearing.
Further, in the sliding bearing seismic isolation device of Patent Document 1, the laminated rubber of the vertical rigidity adjusting mechanism is arranged so as to be deformable in the vertical direction, so that the vertical rigidity of the entire sliding bearing seismic isolation device is the elastic sliding bearing alone. It is smaller than the vertical rigidity of. More specifically, the sliding bearing seismic isolation device has a vertical rigidity set so that the vertical rigidity of the laminated rubber seismic isolation device used in combination with the sliding bearing seismic isolation device becomes uniform with the vertical rigidity of the sliding bearing seismic isolation device. Has been done. With such a configuration, the difference in the amount of subsidence of the superstructure mainly due to the difference in the thickness and the vertical rigidity of the laminated rubber is reduced while using different types of seismic isolation devices.

Generally, in the laminated rubber portion of the laminated rubber bearing, the rubber and the metal plate are overlapped more than the elastic sliding bearing, and the overall height is also high. Moreover, in elastic sliding bearings, relatively hard rubber may be used for the laminated rubber portion. Due to the correlation of these factors, the rigidity of the laminated rubber portion of the elastic sliding bearing tends to be higher than that of the laminated rubber bearing. Other types of sliding bearings, such as rigid sliding bearings, are clearly stiffer than laminated rubber bearings.
Therefore, in the seismic isolation system in which the laminated rubber bearing and the sliding bearing are used together as described above, the horizontal rigidity of the sliding bearing tends to be higher than that of the laminated rubber bearing, and the rigidity in the seismic isolation layer of the building structure tends to be higher. The center may slip near the bearings and the rigid center and the center of gravity may shift, resulting in a high eccentricity of the seismic isolation layer. That is, when the scale of the earthquake is small, it is conceivable that the laminated rubber part of the laminated rubber bearing will try to deform but the sliding bearing will not operate, and as a result, the superstructure will rotate in the horizontal plane around the sliding bearing. .. If the eccentricity of the seismic isolation layer is high, a specific member may be forced to be excessively deformed during an earthquake, and damage to the member may reduce the yield strength of the building structure.

Japanese Unexamined Patent Publication No. 2016-73567

The problem to be solved by the present invention is to provide a seismic isolation device that can suppress the eccentricity of the superstructure and functions as a sliding bearing in the event of a large earthquake, a seismic isolation system using the seismic isolation device, and a seismic isolation structure. Is.

The present invention employs the following means in order to solve the above problems. That is, the present invention is a seismic isolation device provided between the upper structure and the lower structure of the building structure, and is attached to one of the upper structure and the lower structure. A plate, a sliding plate fixed to the other structure facing the mounting plate, a laminated rubber portion provided so as not to be relatively movable in the horizontal direction with respect to the mounting plate, and the sliding of the laminated rubber portion. The laminated rubber portion includes a sliding material provided on the plate side and slidably abutted against the sliding plate, and the laminated rubber portion includes a first laminated rubber portion provided on the mounting plate side and the first laminated rubber portion. It is provided with an axial force transmitter joined to the rubber portion and provided on the sliding plate side, and the first laminated rubber portion is formed with lower rigidity than the axial force transmitter, and is formed from the outer periphery of the laminated rubber portion. Provided is a seismic isolation device which is provided so as to be immovable relative to one of the structures at intervals in the horizontal direction and further provided with a deformation range adjusting mechanism for adjusting the deformation region of the first laminated rubber portion. do.
In the above configuration, the deformation range adjusting mechanism adjusts the deformation region by allowing a certain amount of deformation of the first laminated rubber portion and restricting the deformation of a certain amount or more.
According to the above configuration, the first laminated rubber portion on the mounting plate side fixed to one structure slidably hits the sliding plate side fixed to the other structure, that is, the sliding plate. It is formed with lower rigidity than the axial force transmitter on the side where the contacted sliding material is provided. Therefore, when a small-scale earthquake occurs, the first laminated rubber portion formed with low rigidity is easily deformed in the horizontal direction, and the seismic energy input by extending the period of the building structure is input. Or absorb seismic energy. The deformation of the first laminated rubber portion is not adjusted by the deformation range adjusting mechanism because a gap is provided between the deformation range adjusting mechanism and the outer periphery of the laminated rubber portion. That is, by providing the first laminated rubber portion that has low rigidity and can be deformed in the horizontal direction, the seismic isolation device suppresses the bias of the rigid center in the seismic isolation layer in the vicinity of the seismic isolation device, and the seismic isolation layer The eccentricity ratio can be reduced and the eccentricity of the superstructure can be suppressed.
Further, when the low-rigidity first laminated rubber portion tries to be greatly deformed in the horizontal direction, the outer periphery of the laminated rubber portion is provided with a deformation range that is not relatively movable with respect to one structure on the first laminated rubber portion side. Contact the adjustment mechanism. That is, the deformation range adjusting mechanism suppresses further deformation of the first laminated rubber portion and adjusts the deformed region of the first laminated rubber portion. As described above, in the event of a large earthquake, large deformation of the low-rigidity first laminated rubber portion is suppressed, and the sliding material provided in the laminated rubber portion slides with respect to the sliding plate. Therefore, the seismic isolation device functions as a sliding bearing that consumes seismic energy due to friction caused by sliding.

In one aspect of the present invention, the mounting plate is fixed to the upper structure, the sliding plate is fixed to the lower structure, and the first laminated rubber portion is provided above the laminated rubber portion. ing.
According to the above configuration, the above seismic isolation device can be appropriately realized.

In another aspect of the present invention, the mounting plate is fixed to the upper structure, the sliding plate is fixed to the lower structure, and the first laminated rubber portion is provided on the upper side of the laminated rubber portion. When the mounting plate is provided, the mounting plate is provided with a recess on the lower surface facing the first laminated rubber portion, and a fitting plate that fits into the recess is provided at the upper end of the first laminated rubber portion. By separating the fitting plate and the recess, the mounting plate can move relative to the laminated rubber portion in the vertical direction.
In a general sliding bearing, when an overturning moment acts during an earthquake and the superstructure is partially lifted, the sliding material and the sliding plate of the sliding bearing located in the lifted portion are separated from each other. Then, when the superstructure is seated, the slip material and the slip plate strongly collide with each other, and the slip material and the slide plate may be damaged. If the slip material or the slip plate is damaged, the slip material may not slide smoothly with respect to the slide plate in the event of an earthquake later, and may not act effectively as a slide bearing.
According to the above configuration, the mounting plate fixed to the upper structure is provided with a recess, and a fitting plate that fits into the recess is provided at the upper end of the first laminated rubber portion, and the fitting plate and the recess are separated from each other. As a result, the mounting plate can move relative to the laminated rubber portion in the vertical direction. For this reason, when an overturning moment acts during an earthquake and the superstructure is partially lifted, when the mounting plate rises together with the superstructure, the recesses of the mounting plate and the fitting plate are separated from each other. And the slip material does not rise. As a result, there is no dissociation between the slip material and the slide plate, and it is possible to suppress damage to the slide material and the slide plate that may occur when the superstructure is seated. Therefore, even when an earthquake occurs later, the seismic isolation device effectively acts as a sliding bearing.

In another aspect of the present invention, the deformation range adjusting mechanism is provided at a height position of a joint portion between the first laminated rubber portion and the axial force transmission body.
According to the above configuration, the above seismic isolation device can be appropriately realized.

In another aspect of the present invention, the axial force transmitter is a second laminated rubber portion.
According to the above configuration, the seismic isolation device functions as an elastic sliding bearing in the event of a large earthquake.
In addition, since the number of rubber parts that make up the laminated rubber part increases, when this seismic isolation device is used in combination with a laminated rubber bearing, the vertical rigidity of this seismic isolation device is equal to the vertical rigidity of the laminated rubber bearing. It becomes easy to make adjustments. Therefore, the difference in the amount of subsidence of the superstructure can be easily reduced.

Further, in the present invention, a first seismic isolation device and a second seismic isolation device are provided between the upper structure and the lower structure, and the first seismic isolation device is the above-mentioned seismic isolation device. The second seismic isolation device is a seismic isolation system, which is a laminated rubber support provided with two mounting plates fixed to the upper structure and the lower structure, and a laminated rubber portion provided between the two mounting plates. I will provide a.
According to the above configuration, it is possible to provide a seismic isolation system capable of suppressing the eccentricity of the superstructure and effectively reducing or absorbing seismic energy in the event of a large earthquake.

In one aspect of the present invention, the rigidity of the laminated rubber portion of the second seismic isolation device in the vertical direction is equal to the rigidity of the laminated rubber portion of the first seismic isolation device in the vertical direction.
According to the above configuration, it is possible to reduce the difference in the amount of subsidence of the superstructure while using different types of seismic isolation devices. As a result, it is possible to suppress deformation and damage of the beams erected between different types of seismic isolation devices, which may occur when there is a difference in the amount of subsidence.

In another aspect of the present invention, the laminated rubber portion of the second seismic isolation device is joined to the first laminated rubber portion provided on the one structure side and the other laminated rubber portion. The first laminated rubber portion of the second seismic isolation device has a lower rigidity than the second laminated rubber portion of the second seismic isolation device. The second seismic isolation device is formed so as to be immovably immovable with respect to the one structure at a distance in the horizontal direction from the outer periphery of the laminated rubber portion, and the deformed region of the first laminated rubber portion. It is further equipped with a deformation range adjustment mechanism for adjusting.
In the above configuration, the deformation range adjusting mechanism of the second seismic isolation device allows a certain amount of deformation of the first laminated rubber portion of the second seismic isolation device, and adjusts the deformation area by restricting the deformation beyond a certain level. It is something to do.
In general laminated rubber bearings, the rigidity is often formed to be uniform as a whole. Therefore, in order to prevent the superstructure from coming into contact with the waist wall provided with a certain clearance around it in the event of a large earthquake, each laminated rubber bearing must have a certain degree of rigidity. .. However, if the rigidity is increased, the seismic energy cannot be effectively reduced or absorbed, especially in a small-scale earthquake.
According to the above configuration, the first laminated rubber portion on one structure side is formed with lower rigidity than the second laminated rubber portion on the other structure side. Therefore, when a small-scale earthquake occurs, the first laminated rubber portion formed with low rigidity is easily deformed in the horizontal direction to reduce or absorb seismic energy. The deformation of the first laminated rubber portion is not adjusted by the deformation range adjusting mechanism because a gap is provided between the deformation range adjusting mechanism and the outer periphery of the laminated rubber portion.
Further, when the low-rigidity first laminated rubber portion tries to be greatly deformed in the horizontal direction, the outer periphery of the laminated rubber portion is provided with a deformation range that is not relatively movable with respect to one structure on the first laminated rubber portion side. Contact the adjustment mechanism. That is, the deformation range adjusting mechanism suppresses further deformation of the first laminated rubber portion and adjusts the deformed region of the first laminated rubber portion. As described above, in the event of a large earthquake, large deformation of the low-rigidity first laminated rubber portion is suppressed, and the second laminated rubber portion having higher rigidity than the first laminated rubber portion reduces or absorbs seismic energy.
In this way, by increasing the rigidity of the second laminated rubber portion that reduces or absorbs seismic energy during a large earthquake and adjusting the deformation range of the first laminated rubber portion, contact of the superstructure with the waist wall can be achieved. It is possible to effectively reduce or absorb seismic energy even in the event of a small earthquake while suppressing it.

In another aspect of the present invention, the mounting plate of the second seismic isolation device fixed to the superstructure has a recess on the lower surface facing the laminated rubber portion, and the second seismic isolation device has a recess. A fitting plate that fits into the recess is provided at the upper end of the laminated rubber portion, and the fitting plate of the second seismic isolation device and the recess are separated from each other, so that the mounting plate of the second seismic isolation device is said. It can move relative to the laminated rubber part in the vertical direction.
According to the above configuration, the mounting plate fixed to the superstructure is provided with a recess, and a fitting plate that fits into the recess is provided at the upper end of the second seismic isolation device, and the fitting plate and the recess are separated from each other. As a result, the mounting plate can move relative to the laminated rubber portion in the vertical direction. Therefore, when an overturning moment acts during an earthquake and the superstructure is partially lifted, the recess of the mounting plate and the fitting plate are separated when the mounting plate rises together with the superstructure. As a result, it is possible to suppress damage to the second seismic isolation device due to an excessive pulling force acting on the second seismic isolation device.

The present invention also provides a seismic isolation structure having a seismic isolation system as described above and having a tower-like ratio of 4 or more.
According to the above configuration, it is possible to realize a seismic isolation structure capable of suppressing the eccentricity of the superstructure and effectively reducing or absorbing seismic energy in the event of a large earthquake.

According to the present invention, it is possible to provide a seismic isolation device that can suppress the eccentricity of the superstructure and functions as a sliding bearing in the event of a large earthquake, a seismic isolation system using the seismic isolation device, and a seismic isolation structure.

It is a front view of the building structure provided with the seismic isolation device (first seismic isolation device) and the seismic isolation system in the embodiment of the present invention. It is a top view near the seismic isolation layer of the said building structure. It is a vertical sectional view of the seismic isolation device (first seismic isolation device) in the above embodiment. It is a vertical sectional view of the laminated rubber bearing (second seismic isolation device) in the seismic isolation system in the said embodiment. It is explanatory drawing explaining the operation of the said seismic isolation device and seismic isolation system at the time of a small-scale earthquake. It is explanatory drawing explaining the operation of the said seismic isolation device and seismic isolation system at the time of a big earthquake. It is explanatory drawing explaining the operation of the said seismic isolation device and the seismic isolation system when the force which lifts the superstructure is applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The seismic isolation device in the present embodiment is provided between the upper structure and the lower structure of the building structure, and is a mounting plate fixed to either the upper structure or the lower structure. A sliding plate facing the mounting plate and fixed to the other structure, a laminated rubber portion provided so as not to be relatively movable in the horizontal direction with respect to the mounting plate, and a sliding plate side of the laminated rubber portion. It is provided with a sliding material that is slidably abutted against the sliding plate, and the laminated rubber portion is joined to the first laminated rubber portion provided on the mounting plate side and the first laminated rubber portion. It is provided with an axial force transmitter provided on the side, and the first laminated rubber portion is formed with lower rigidity than the axial force transmitter, and is spaced horizontally from the outer periphery of the laminated rubber portion to one of the structures. It is further provided with a deformation range adjusting mechanism for adjusting the deformation region of the first laminated rubber portion, which is provided so as not to be relatively movable.

FIG. 1 is a front view of a building structure (seismic isolation structure) provided with a seismic isolation device and a seismic isolation system according to the present embodiment. In FIG. 1, the length direction X of the building structure (seismic isolation structure) 1 is shown in the depth direction of the paper, and the width direction Y is shown in the lateral direction of the paper. The building structure 1 includes a lower structure 2 and an upper structure 5.
In the present embodiment, the lower structure 2 is mainly provided by being buried below the ground surface GL. The lower structure 2 includes a foundation 3 and a waist wall 4 provided so as to stand up above the periphery of the foundation 3.
An upper structure 5 is provided on the foundation 3 via a seismic isolation layer 8 composed of first and second seismic isolation devices 20 and 40 described later. The superstructure 5 includes columns 6 provided on the first and second seismic isolation devices 20 and 40, and beams 7 erected between the columns 6. In the present embodiment, as shown in FIG. 1, the superstructure 5 is a tower-like building having a tower-like ratio of, for example, 4 or more.
Here, the tower ratio is the ratio of the height and the width of the building structure, and is expressed as H / B when the width of the building structure is B and the height is H with respect to the direction in which the seismic force acts. Is done. The building structure in the present embodiment is a seismic isolation structure under the foundation with eight layers above the ground, and is a structure having one span in the short side direction (width direction Y). As shown in FIG. 1, assuming that the distance between the seismic isolation devices 20 and 40 is B and the height of the superstructure 5 from the seismic isolation devices 20 and 40 is H, the short side direction to be particularly considered in design. The tower ratio of is H / B.
Between the upper structure 5 and the inner surface 4c of the waist wall 4, when the upper structure 5 moves horizontally with respect to the lower structure 2 due to an earthquake or the like, the upper structure 5 and the waist wall 4 A clearance C is provided so that the two do not come into contact with each other.

The building structure 1 includes first and second seismic isolation devices 20 and 40, and a seismic isolation system is constructed by these first and second seismic isolation devices 20 and 40.
FIG. 2 is a plan view of the building structure 1 in the vicinity of the seismic isolation layer 8. FIG. 2 shows the positional relationship between the outer contour of the superstructure 5 and the lowermost beam 7, and the first and second seismic isolation devices 20 and 40. In FIG. 2, the first seismic isolation device 20 is shown with hatching. When the superstructure 5 is viewed in a plan view, the first seismic isolation device 20 is centrally provided in the center of the superstructure 5 in the length direction X, and the second seismic isolation device 40 is provided at both ends of the superstructure 5 in the length direction X. It is provided.

FIG. 3 is a schematic vertical sectional view of the first seismic isolation device 20.
The upper structure 5 includes a substantially rectangular parallelepiped upper footing 12 provided below the pillar 6 shown in FIG. 1 so as to project downward from the lower surface 5b of the upper structure 5. The lower structure 2 includes a substantially rectangular parallelepiped lower footing 11 provided so as to project upward from the upper surface 2a of the lower structure 2 so as to face the upper footing 12.
The first seismic isolation device (seismic isolation device) 20 is interposed between the upper structure 5 and the lower structure 2 of the building structure 1, more specifically between the upper footing 12 and the lower footing 11. It is provided.

The first seismic isolation device 20 includes a mounting plate 21 fixed to the upper structure (one structure) 5, a sliding plate 23 fixed to the lower structure (the other structure) 2, and a mounting plate 21. A laminated rubber portion 24 interposed between the sliding plates 23 and a sliding material 31 are provided.

The mounting plate 21 is a thick flat plate-shaped member formed in a circular shape larger than the contour shape of the laminated rubber portion 24 when viewed in a plan view. One surface of the mounting plate 21 is provided along the lower surface 12b of the upper footing 12, and is fixed to the upper structure 5. As will be described later, a laminated rubber portion 24 is provided below the mounting plate 21, and the mounting plate 21 is provided with a recess 21s on the lower surface 21b at a position facing the laminated rubber portion 21 so as to be recessed upward. The concave portion 21s is formed so that the contour shape when viewed in a plan view substantially matches the contour shape of the laminated rubber portion 24.
A connecting nut 13 such as a high nut is embedded in the upper footing 12 so as to extend in the vertical direction, and the mounting plate 21 is tightened by screwing a bolt 22 from below toward the lower end 13b of the connecting nut 13. By making it, it is fixed to the upper footing 12. Anchor bolts 14 are screwed and tightened to the upper end 13a of the connection nut 13 and are embedded in the upper footing 12.

The sliding plate 23 is formed in a plate shape, for example, from stainless steel or the like. The sliding plate 23 is provided facing the mounting plate 21 so that one surface thereof is along the upper surface 11a of the lower footing 11, and is fixed to the lower structure 2.

The laminated rubber portion 24 is provided so as to be interposed between the mounting plate 21 and the sliding plate 23. The laminated rubber portion 24 is a shaft provided on the mounting plate 21 side, that is, on the sliding plate 23 side, that is, on the lower side, which is joined to the first laminated rubber portion 25 provided on the upper side and the first laminated rubber portion 25. It is equipped with a force transmitter 26. In the present embodiment, the axial force transmitter 26 is the second laminated rubber portion 26.
Both the first and second laminated rubber portions 25 and 26 are formed by laminating a steel plate 24p and a rubber 24g. Since FIG. 3 is a schematic cross-sectional view, the first and second laminated rubber portions 25 and 26 are both shown to include three steel plates 24p, but in reality, the laminated steel plates 24p are shown. It goes without saying that the number is not limited to this.
A lower flange plate 28 is fixed to the lower end 25b of the first laminated rubber portion 25, and an upper flange plate 29 is fixed to the upper end 26a of the second laminated rubber portion 26. Each of the flange plates 28 and 29 is formed in a circular shape so as to have an outer circumference larger than the outer circumference of the first and second laminated rubber portions 25 and 26. The flange plates 28 and 29 are provided so as to face each other and are in contact with each other, and are fixed in the vertical direction Z by bolts and nuts 30 so that the first laminated rubber portion 25 and the second laminated rubber portion 26 are fixed to each other. ing.

A fitting plate 27 is joined to the upper end 25a of the first laminated rubber portion 25. The fitting plate 27 is formed so that the contour shape substantially matches the contour shape of the first laminated rubber portion 25 and the contour shape of the recess 21s of the mounting plate 21 when viewed in a plan view.
A sliding material 31 formed of a fluororesin or the like is joined and provided on the lower end 26b of the second laminated rubber portion 26, that is, on the sliding plate 23 side of the laminated rubber portion 24.

The laminated rubber portion 24 as described above is provided so that the sliding material 31 comes into contact with the sliding plate 23 so that the sliding material 31 is slidable with respect to the sliding plate 23.
Further, the fitting plate 27 is provided so as to be fitted in the recess 21s of the mounting plate 21.
As a result, the axial force of the upper structure 5 borne by the pillar 6 shown in FIG. 1 is applied to the fitting plate 27, the first laminated rubber portion 25, the second laminated rubber portion 26, and the lower footing 11 from the upper footing 12. It is transmitted to the substructure 2 via.

The fitting plate 27 is not joined to the mounting plate 21 and is provided so as to be removably detachable from the recess 21s. That is, when a force that causes the mounting plate 21 to move upward is applied, the fitting plate 27 and the recess 21s are separated from each other, so that the mounting plate 21 can move relative to the laminated rubber portion 24 in the vertical direction Z. It has a structure.

The first seismic isolation device 20 includes a tubular portion 35. The tubular portion 35 is formed in a cylindrical shape so that the inner circumference thereof is larger than the outer circumference of the first laminated rubber portion 25 and, more specifically, the outer circumference of each of the flange plates 28 and 29. The tubular portion 35 is provided below the mounting plate 21 so that the axial direction coincides with the vertical direction Z and the laminated rubber portion 24 is located inside the tubular portion 35, and the upper end 35a is the outer periphery of the mounting plate 21. It is joined in the vicinity. As described above, the tubular portion 35 is provided so as not to be relatively movable with respect to the superstructure 5.
The tubular portion 35 is formed so that the lower end 35b of the tubular portion 35 is located below the joint portion J between the first laminated rubber portion 25 and the second laminated rubber portion 26.
With the above configuration, the inner surface 35c of the tubular portion 35 is horizontally spaced from the outer periphery of the laminated rubber portion 24, more specifically from the outer peripheral ends (outer circumference) 28c and 29c of the flange plates 28 and 29. It is provided by opening S. Therefore, the first laminated rubber portion 25 can be deformed in the horizontal direction within the range of the interval S until the outer circumferences 28c and 29c of the joint portion J abut on the inner surface 35c of the tubular portion 35, and the joint portion J Can move relative to the tubular portion 35 in the horizontal direction. In the above interval S, when the scale of the earthquake is small, even if the first laminated rubber portion 25 is deformed, the outer peripheral ends 28c and 29c of the flange plates 28 and 29 hit the inner surface 35c of the tubular portion 35. It is sized so that it does not touch. Further, in the interval S, when the first laminated rubber portion 25 is about to be significantly deformed during a large earthquake, the outer peripheral ends 28c and 29c of the flange plates 28 and 29 come into contact with the inner surface 35c of the tubular portion 35. It is sized.

The first laminated rubber portion 25 is formed to have lower rigidity than the second laminated rubber portion 26.
In particular, the first laminated rubber portion 25 has a horizontal rigidity to such an extent that the first laminated rubber portion 25 is deformed before the sliding material 31 slides with respect to the sliding plate 23 in the event of an earthquake. It is formed to be low. That is, the horizontal rigidity of the first laminated rubber portion 25 is lower than the frictional resistance generated between the sliding plate 23 and the sliding material 31.

FIG. 4 is a schematic vertical sectional view of the second seismic isolation device 40.
Like the first seismic isolation device 20, the second seismic isolation device (laminated rubber bearing) 40 is provided between the upper footing 12 and the lower footing 11.

The second seismic isolation device 40 has an upper mounting plate (mounting plate) 41 fixed to the upper structure (one structure) 5 and a lower mounting fixed to the lower structure (the other structure) 2. It includes a plate (mounting plate) 43 and a laminated rubber portion 44 interposed between the two mounting plates 41 and 43.

The mounting plates 41 and 43 are thick flat plate-shaped members formed in a circular shape larger than the contour shape of the laminated rubber portion 44 when viewed in a plan view. One surface of the upper mounting plate 41 is provided along the lower surface 12b of the upper footing 12, and is fixed to the upper structure 5. As will be described later, a laminated rubber portion 44 is provided below the upper mounting plate 41, and the upper mounting plate 41 is provided with a recess 41s on the lower surface 41b at a position facing the laminated rubber portion 41 so as to be recessed upward. There is. The concave portion 41s is formed so that the contour shape when viewed in a plan view substantially matches the contour shape of the laminated rubber portion 44.
Similar to the mounting plate 21 of the first seismic isolation device 20, the upper mounting plate 41 is screwed to the connecting nut 13 in the upper footing 12 by bolts 42 and tightened.

The lower mounting plate 43 is provided facing the upper mounting plate 41 so that one surface is along the upper surface 11a of the lower footing 11, and is fixed to the lower structure 2 in the same manner as the upper mounting plate 41. There is.

The laminated rubber portion 44 is provided so as to be interposed between the two mounting plates 41 and 43. The laminated rubber portion 44 is provided on the upper mounting plate 41 side, that is, on the lower mounting plate 43 side, that is, on the lower side, which is joined to the first laminated rubber portion 45 provided on the upper side and the first laminated rubber portion 45. The second laminated rubber portion 46 is provided.
Both the first and second laminated rubber portions 45 and 46 are formed by laminating a steel plate 44p and a rubber 44g. Needless to say, the number of the steel plates 44p of the first and second laminated rubber portions 45 and 46 is not limited to the number shown in FIG. 4, as in the first seismic isolation device 20.
A lower flange plate 48 is fixed to the lower end 45b of the first laminated rubber portion 45, and an upper flange plate 49 is fixed to the upper end 46a of the second laminated rubber portion 46. Each of the flange plates 48 and 49 is formed in a circular shape so as to have an outer circumference larger than the outer circumference of the first and second laminated rubber portions 45 and 46. The flange plates 48 and 49 are provided so as to face each other and are in contact with each other, and are fixed in the vertical direction Z by bolts and nuts 50 so that the first laminated rubber portion 45 and the second laminated rubber portion 46 are fixed to each other. ing.

A fitting plate 47 is joined to the upper end 45a of the first laminated rubber portion 45. The fitting plate 47 is formed so that the contour shape substantially matches the contour shape of the first laminated rubber portion 45 and the contour shape of the recess 41s of the upper mounting plate 41 when viewed in a plan view.
A lower flange plate 51 is joined and provided on the lower end 46b side of the second laminated rubber portion 46.

The first laminated rubber portion 45 is formed to have lower rigidity than the second laminated rubber portion 46.

In the laminated rubber portion 44 as described above, the lower flange plate 51 joined to the second laminated rubber portion 46 comes into contact with the lower mounting plate 43, and the lower mounting plate 43 is similarly to the upper mounting plate 41. It is fixed to the lower footing 11 by being tightened to the connection nut 13 embedded in the lower footing 11 by the bolt 42 that inserts the lower flange plate 51.
Further, the fitting plate 47 is provided so as to be fitted in the recess 41s of the upper mounting plate 41.
As a result, the axial force of the upper structure 5 borne by the pillar 6 shown in FIG. 1 is applied to the fitting plate 47, the first laminated rubber portion 45, the second laminated rubber portion 46, and the lower footing 11 from the upper footing 12. It is transmitted to the substructure 2 via.

The fitting plate 47 is not joined to the upper mounting plate 41 and is provided so as to be removably detachable from the recess 41s. That is, when a force that causes the upper mounting plate 41 to move upward is applied, the fitting plate 47 and the recess 41s are separated from each other, so that the upper mounting plate 41 moves relative to the laminated rubber portion 44 in the vertical direction Z. It has a possible structure.

The second seismic isolation device 40 includes a tubular portion 55. The tubular portion 55 is formed in a cylindrical shape so that the inner circumference thereof is larger than the outer circumference of the first laminated rubber portion 45, and more specifically, the outer circumference of each of the flange plates 48 and 49. The tubular portion 55 is provided below the upper mounting plate 41 so that the axial direction coincides with the vertical direction Z and the laminated rubber portion 44 is located inside the tubular portion 55, and the upper end 55a is the upper mounting plate 41. It is joined near the outer circumference of. As described above, the tubular portion 55 is provided so as not to be relatively movable with respect to the superstructure 5.
The tubular portion 55 is formed so that the lower end 55b of the tubular portion 55 is located below the joint portion J between the first laminated rubber portion 45 and the second laminated rubber portion 46.
With the above configuration, the inner surface 55c of the tubular portion 55 is horizontally spaced from the outer periphery of the laminated rubber portion 44, more specifically from the outer peripheral ends (outer circumference) 48c, 49c of the flange plates 48, 49. It is provided by opening S. Therefore, the first laminated rubber portion 45 can be deformed in the horizontal direction within the range of the interval S until the outer circumferences 48c and 49c of the joint portion J abut on the inner surface 55c of the tubular portion 55, and the joint portion J can be deformed. Can move relative to the tubular portion 55 in the horizontal direction. In the above interval S, when the scale of the earthquake is small, even if the first laminated rubber portion 45 is deformed, the outer peripheral ends 48c and 49c of the flange plates 48 and 49 hit the inner surface 55c of the tubular portion 55. It is sized so that it does not touch. Further, in the interval S, when the first laminated rubber portion 45 is about to be significantly deformed during a large earthquake, the outer peripheral ends 48c and 49c of the flange plates 48 and 49 come into contact with the inner surface 55c of the tubular portion 55. It is sized.

The rigidity of the laminated rubber portion 24 of the first seismic isolation device 20 in the vertical direction Z and the rigidity of the laminated rubber portion 44 of the second seismic isolation device 40 in the vertical direction Z are formed to substantially match.

Next, the operation of the seismic isolation device, the seismic isolation system, and the seismic isolation structure will be described with reference to FIGS. 5 to 7.
As described above, in the first seismic isolation device 20, the rigidity of the first laminated rubber portion 25 is less than the rigidity of the second laminated rubber portion 26. Further, in the second seismic isolation device 40, the rigidity of the first laminated rubber portion 45 is less than the rigidity of the second laminated rubber portion 46. That is, in each of the first and second seismic isolation devices 20 and 40, the first laminated rubber portions 25 and 45 have a structure that is more easily deformed than the second laminated rubber portions 26 and 46. And the second seismic isolation devices 20 and 40 operate as follows.

First, the action when a small-scale earthquake occurs will be explained. 5 (a) and 5 (b) are explanatory views showing the operation of the first seismic isolation device 20 and the second seismic isolation device 40 at the time of a small-scale earthquake, respectively. FIG. 5 shows a situation in which the upper structure 5 tries to move relative to the lower structure 2 in the right direction due to an earthquake.
In the first seismic isolation device 20, when the upper structure 5 tries to move relative to the lower structure 2 in the horizontal direction, the mounting plate 21 is fixed to the upper structure 5, so that the mounting plate is fixed. 21 also tries to move in the horizontal direction together with the superstructure 5. At this time, the fitting plate 27, which is fitted in the recess 21s recessed upward of the mounting plate 21 and is provided so as not to be relatively movable in the horizontal direction with respect to the mounting plate 21, also moves in the horizontal direction together with the mounting plate 21. try to.
Here, the first laminated rubber portion 25 is formed to have lower rigidity than the second laminated rubber portion 26, and the horizontal rigidity of the first laminated rubber portion 25 is the friction generated between the sliding plate 23 and the sliding material 31. Since the resistance is lower than the resistance, the first laminated rubber portion 25 is deformed. The distance S between the outer peripheral ends 28c and 29c of the flange plates 28 and 29 and the inner surface 35c of the tubular portion 35 is such that even if the first laminated rubber portion 25 is deformed when a small-scale earthquake occurs, each flange plate 28 , 29 is sized so that the outer peripheral ends 28c and 29c do not come into contact with the inner surface 35c of the tubular portion 35. Therefore, the deformation of the first laminated rubber portion 25 is not adjusted by the tubular portion 35, and the seismic energy is reduced by the first laminated rubber portion 25.

In the second seismic isolation device 40, when the upper structure 5 tries to move relative to the lower structure 2 in the horizontal direction, the upper mounting plate 41 and the upper side are similarly to the first seismic isolation device 20. The fitting plate 47, which is provided so as not to be relatively movable in the horizontal direction with respect to the mounting plate 41, tries to move in the horizontal direction integrally with the superstructure 5.
Here, since the first laminated rubber portion 45 is formed with lower rigidity than the second laminated rubber portion 46, the first laminated rubber portion 45 is deformed. The distance S between the outer peripheral ends 48c and 49c of the flange plates 48 and 49 and the inner surface 55c of the tubular portion 55 is such that even if the first laminated rubber portion 55 is deformed when a small-scale earthquake occurs, each flange plate 48 , 49 is sized so that the outer peripheral ends 48c and 49c do not come into contact with the inner surface 55c of the tubular portion 55. Therefore, the deformation of the first laminated rubber portion 45 is not adjusted by the tubular portion 55, and the seismic energy is reduced by the first laminated rubber portion 45.

As described above, when a small-scale earthquake occurs, the seismic energy is reduced mainly by the first laminated rubber portions 25 and 45 in each of the first seismic isolation device 20 and the second seismic isolation device 40. ..

Next, the action in the event of a large earthquake will be described. 6 (a) and 6 (b) are explanatory views showing the operation of the first seismic isolation device 20 and the second seismic isolation device 40 at the time of a large earthquake, respectively. FIG. 6 shows a situation in which the upper structure 5 tries to move relative to the lower structure 2 in the right direction due to an earthquake.
In the first seismic isolation device 20, in the event of a large earthquake, the superstructure 5 tries to move further in the horizontal direction from the state shown in FIG. 5A. The distance S between the outer peripheral ends 28c and 29c of the flange plates 28 and 29 and the inner surface 35c of the tubular portion 35 is such that when the first laminated rubber portion 25 is about to be significantly deformed during a large earthquake, each flange plate 28, The outer peripheral ends 28c and 29c of 29 are sized to abut on the inner surface 35c of the tubular portion 35. Therefore, the outer peripheral ends 28c and 29c of the flange plates 28 and 29 abut on the inner surface 35c of the tubular portion 35, and further deformation of the first laminated rubber portion 25 is restricted. As described above, the portion of the tubular portion 35, particularly the portion located at the height of the joint portion J between the first laminated rubber portion 25 and the second laminated rubber portion 26, is deformed to adjust the deformation region of the first laminated rubber portion 25. Functions as a range adjustment mechanism.
Since the deformation of the first laminated rubber portion 25 is restricted in this way, the flange plates 28, 29, the second laminated rubber portion 26, and the sliding material 31 are finally shown together with the superstructure 5 and the tubular portion 35. 6 (a) moves in the horizontal direction by the amount indicated as the slip amount Δd, and the slip material 31 slides with respect to the slide plate 23. Seismic energy is reduced by converting seismic energy into thermal energy by the frictional force generated during this sliding.

In the second seismic isolation device 40, in the event of a large earthquake, the superstructure 5 tries to move further in the horizontal direction from the state shown in FIG. 5 (b). The distance S between the outer peripheral ends 48c and 49c of the flange plates 48 and 49 and the inner surface 55c of the tubular portion 55 is such that when the first laminated rubber portion 45 is about to be significantly deformed during a large earthquake, each flange plate 48, The outer peripheral ends 48c and 49c of the 49 are sized to abut on the inner surface 55c of the tubular portion 55. Therefore, the outer peripheral ends 48c and 49c of the flange plates 48 and 49 abut on the inner surface 55c of the tubular portion 55, and further deformation of the first laminated rubber portion 45 is restricted. As described above, the portion of the tubular portion 55, particularly the portion located at the height of the joint portion J between the first laminated rubber portion 45 and the second laminated rubber portion 46, is deformed to adjust the deformation region of the first laminated rubber portion 45. Functions as a range adjustment mechanism.
Since the deformation of the first laminated rubber portion 45 is restricted in this way, the flange plates 48 and 49 will eventually move together with the superstructure 5 and the tubular portion 55, and the second laminated rubber portion 46 will be deformed. As a result, the seismic energy is reduced.

As described above, when a large earthquake occurs, the seismic energy is generated by the sliding plate 23 and the sliding material 31 in the first seismic isolation device 20 and by the second laminated rubber portion 46 in the second seismic isolation device 40. It will be reduced.

Next, the action when the superstructure 5 is partially lifted due to the action of the overturning moment during an earthquake will be described. 7 (a) and 7 (b) are explanatory views showing the operation of the first seismic isolation device 20 and the second seismic isolation device 40 when a force is applied to lift the superstructure 5, respectively.
In each of the first and second seismic isolation devices 20 and 40, when the upper structure 5 tries to move upward, the mounting plates 21 and 41 are fixed to the upper structure 5, so that the mounting plate 21 , 41 also try to move together with the superstructure 5. When a force that causes the mounting plates 21 and 41 to move upward is applied, the fitting plates 27 and 47 and the recesses 21s and 41s are separated from each other, so that the mounting plates 21 and 41 are separated from the laminated rubber portions 24 and 44. It has a structure that allows relative movement in the vertical direction Z. Therefore, when the mounting plates 21 and 41 move upward, a gap S1 is formed between the mounting plates 21 and 41 and the fitting plates 27 and 47, and the fitting plates 27 of the first and second seismic isolation devices 20 and 40, The part below 47 does not move.

When the superstructure 5 is seated, the mounting plates 21 and 41 move downward in both the first and second seismic isolation devices 20 and 40, and the fitting plates 27 and 47 reappear in the recesses 21s and 41s. Fit.

Next, the effects of the above seismic isolation device, seismic isolation system, and seismic isolation structure will be described.

The first seismic isolation device (seismic isolation device) 20 of the present embodiment is the first seismic isolation device 20 provided between the upper structure 5 and the lower structure 2 of the building structure 1, and is the upper structure ( The mounting plate 21 fixed to the mounting plate (1) 5, the sliding plate 23 fixed to the lower structure (the other structure) 2 facing the mounting plate 21, and the mounting plate 21 in the horizontal direction. The laminated rubber portion 24 is provided with a laminated rubber portion 24 provided so as to be relatively immovable, and a sliding material 31 provided on the sliding plate 23 side of the laminated rubber portion 24 and slidably abutted against the sliding plate 23. Is a first laminated rubber portion 25 provided on the mounting plate 21 side, and a second laminated rubber portion (axial force transmitter) 26 joined to the first laminated rubber portion 25 and provided on the sliding plate 23 side. The first laminated rubber portion 25 is formed to have lower rigidity than the second laminated rubber portion 26, and is relatively spaced from the outer circumferences 28c and 29c of the laminated rubber portion 24 in the horizontal direction with respect to the superstructure 5. It is provided immovably and further includes a tubular portion (deformation range adjusting mechanism) 35 that adjusts the deformation region of the first laminated rubber portion 25.
In the above configuration, the deformation range adjusting mechanism 35 adjusts the deformation region by allowing a certain amount of deformation of the first laminated rubber portion 25 and restricting the deformation of the first laminated rubber portion 25 or more.
According to the above configuration, the first laminated rubber portion 25 on the mounting plate 21 side fixed to the upper structure 5 slides on the sliding plate 23 side fixed to the lower structure 2, that is, on the sliding plate 23. It is formed to have lower rigidity than the second laminated rubber portion 26 on the side where the sliding member 31 that is movably abutted is provided. Therefore, when a small-scale earthquake occurs, the first laminated rubber portion 25 formed with low rigidity is easily deformed in the horizontal direction, and the building structure 1 is input with a long period. Reduce seismic energy. The deformation of the first laminated rubber portion 25 is not adjusted by the tubular portion 35 because the space S is provided between the tubular portion 35 and the outer circumferences 28c and 29c of the laminated rubber portion 24. That is, by providing the first laminated rubber portion 25 having low rigidity and deformable in the horizontal direction, the first seismic isolation device 20 causes the rigidity of the seismic isolation layer 8 to be biased toward the vicinity of the first seismic isolation device 20. It can be suppressed, the eccentricity of the seismic isolation layer 8 can be reduced, and the eccentricity of the superstructure 5 can be suppressed.
Further, when the low-rigidity first laminated rubber portion 25 tries to be greatly deformed in the horizontal direction, the outer circumferences 28c and 29c of the laminated rubber portion 24 cannot move relative to the upper structure 5 on the first laminated rubber portion 25 side. It comes into contact with the tubular portion 35 provided in the above. That is, the tubular portion 35 suppresses further deformation of the first laminated rubber portion 25 and adjusts the deformation region of the first laminated rubber portion 25. As described above, in the event of a large earthquake, large deformation of the low-rigidity first laminated rubber portion 25 is suppressed, and the sliding material 31 provided in the laminated rubber portion 24 slides with respect to the sliding plate 23. Therefore, the first seismic isolation device 20 functions as a sliding bearing that consumes seismic energy due to friction caused by sliding.

Further, the mounting plate 21 is fixed to the upper structure 5, the sliding plate 23 is fixed to the lower structure 2, and the first laminated rubber portion 25 is provided on the upper side of the laminated rubber portion 24.
According to the above configuration, the first seismic isolation device 20 can be appropriately realized.

Further, the mounting plate 21 is provided with a recess 21s on the lower surface 21b facing the first laminated rubber portion 25, and the upper end 25a of the first laminated rubber portion 25 is provided with a fitting plate 27 to be fitted to the recess 21s. When the plywood 27 and the recess 21s are separated from each other, the mounting plate 21 can move relative to the laminated rubber portion 24 in the vertical direction.
According to the above configuration, the mounting plate 21 fixed to the upper structure 5 is provided with the recess 21s, and the upper end 25a of the first laminated rubber portion 25 is provided with the fitting plate 27 to be fitted to the recess 21s. When the fitting plate 27 and the recess 21s are separated from each other, the mounting plate 21 can move relative to the laminated rubber portion 24 in the vertical direction. Therefore, when the upper structure 5 is partially lifted due to the overturning moment during an earthquake, when the mounting plate 21 rises together with the upper structure 5, the recesses 21s of the mounting plate 21 and the fitting plate 27 are formed. Since they are separated, the laminated rubber portion 24 and the sliding material 31 do not rise. As a result, the sliding material 31 and the sliding plate 23 do not dissociate from each other, and it is possible to suppress damage to the sliding material 31 and the sliding plate 23 that may occur when the superstructure 5 is seated. Therefore, even when an earthquake occurs later, the first seismic isolation device 20 effectively acts as a sliding bearing.
In the present embodiment, as described above, the building structure 1 has a high tower-like ratio in which a large overturning moment is likely to act, so that the above effect can be more effectively achieved.

Further, the deformation range adjusting mechanism 35 is provided at the height position of the joint portion J between the first laminated rubber portion 25 and the second laminated rubber portion 26.
According to the above configuration, the first seismic isolation device 20 can be appropriately realized.

Further, the axial force transmitter 26 is a second laminated rubber portion 26.
According to the above configuration, the first seismic isolation device 20 functions as an elastic sliding bearing in the event of a large earthquake.
Further, since the number of rubber portions constituting the laminated rubber portion 24 increases, when the first seismic isolation device 20 is used in combination with the laminated rubber bearing (second seismic isolation device 40), the vertical direction Z of the first seismic isolation device 20 It becomes easy to adjust the rigidity of the laminated rubber bearing so as to be equal to the rigidity in the vertical direction Z of the laminated rubber bearing. Therefore, the difference in the amount of subsidence of the superstructure 5 can be easily reduced.

Further, the seismic isolation system of the present embodiment includes a first seismic isolation device 20 and a second seismic isolation device 40 between the upper structure 5 and the lower structure 2, and the second seismic isolation device is the upper structure. Laminating with upper and lower mounting plates (two mounting plates) 41 and 43 fixed to 5 and the lower structure 2 and a laminated rubber portion 44 provided between the upper and lower mounting plates 41 and 43. It is a rubber bearing.
According to the above configuration, it is possible to provide a seismic isolation system capable of suppressing the eccentricity of the superstructure 5 and effectively reducing the seismic energy in the event of a large earthquake.

Further, the rigidity of the laminated rubber portion 44 of the second seismic isolation device 40 in the vertical direction is equal to the rigidity of the laminated rubber portion 24 of the first seismic isolation device 20 in the vertical direction.
According to the above configuration, it is possible to reduce the difference in the amount of subsidence of the superstructure 5 while using different types of seismic isolation devices 20 and 40. As a result, it is possible to suppress deformation and damage of the beam 7A (see FIG. 2) erected between the different types of seismic isolation devices 20 and 40, which may occur when there is a difference in the amount of subsidence.

Further, the laminated rubber portion 44 of the second seismic isolation device 40 is joined to the first laminated rubber portion 45 provided on the upper structure 5 side and the first laminated rubber portion 45 and is provided on the lower structure 2 side. The first laminated rubber portion 45 of the second seismic isolation device 40 is formed to have a lower rigidity than the second laminated rubber portion 46 of the second seismic isolation device 40, and is provided with a second laminated rubber portion 46. The seismic isolation device 40 is provided so as to be relatively immovable with respect to the superstructure 5 at intervals S in the horizontal direction from the outer circumferences 48c and 49c of the laminated rubber portion 44, and adjusts the deformation region of the first laminated rubber portion 45. A tubular portion (deformation range adjusting mechanism) 55 is further provided.
In the above configuration, the deformation range adjusting mechanism 55 of the second seismic isolation device 40 allows a certain amount of deformation of the first laminated rubber portion 45 of the second seismic isolation device 40, and regulates the deformation beyond a certain level. It adjusts the deformation area.
According to the above configuration, the first laminated rubber portion 45 on the upper structure 5 side is formed to have lower rigidity than the second laminated rubber portion 46 on the lower structure 2 side. Therefore, when a small-scale earthquake occurs, the first laminated rubber portion 45 formed with low rigidity is easily deformed in the horizontal direction to reduce the seismic energy. The deformation of the first laminated rubber portion 45 is not adjusted by the tubular portion 55 because the space S is provided between the tubular portion 55 and the outer circumferences 48c and 49c of the laminated rubber portion 44.
Further, when the low-rigidity first laminated rubber portion 45 tries to be greatly deformed in the horizontal direction, the outer circumferences 48c and 49c of the laminated rubber portion 44 cannot move relative to the upper structure 5 on the first laminated rubber portion 45 side. It comes into contact with the tubular portion 55 provided in the above. That is, the tubular portion 55 suppresses further deformation of the first laminated rubber portion 45, and adjusts the deformation region of the first laminated rubber portion 45. As described above, in the event of a large earthquake, large deformation of the low-rigidity first laminated rubber portion 45 is suppressed, and the second laminated rubber portion 46 having higher rigidity than the first laminated rubber portion 45 reduces seismic energy.
In this way, by increasing the rigidity of the second laminated rubber portion 46 that reduces seismic energy in the event of a large earthquake and adjusting the deformation range of the first laminated rubber portion 45, the upper structure 5 can be attached to the waist wall 4. It is possible to effectively reduce seismic energy even in the event of a small-scale earthquake while suppressing contact.

Further, the upper mounting plate 41 of the second seismic isolation device 40 fixed to the upper structure 5 has a recess 41s on the lower surface 41b facing the laminated rubber portion 44, and the laminated rubber portion 44 of the second seismic isolation device 40. A fitting plate 47 that fits into the recess 41s is provided at the upper end 45a of the above, and the fitting plate 47 of the second seismic isolation device 40 and the recess 41s are separated from each other, so that the upper mounting plate 41 of the second seismic isolation device 40 is laminated. It can move relative to the rubber portion 44 in the vertical direction Z.
According to the above configuration, the upper mounting plate 41 fixed to the upper structure 5 is provided with a recess 41s, and the upper end 45a of the laminated rubber portion 44 is provided with a fitting plate 47 to be fitted to the recess 41s. When the plywood 47 and the recess 41s are separated from each other, the upper mounting plate 41 can move relative to the laminated rubber portion 44 in the vertical direction. Therefore, when the upper structure 5 is partially lifted due to an overturning moment during an earthquake, when the upper mounting plate 41 rises together with the upper structure 5, the recess 41s of the upper mounting plate 41 and the fitting plate are used. 47 leaves. As a result, it is possible to suppress damage to the second seismic isolation device 40 due to an excessive pulling force acting on the second seismic isolation device 40.

Further, the building structure (seismic isolation structure) 1 is provided with the seismic isolation system as described above, and the tower-like ratio of the superstructure 5 is 4 or more.
According to the above configuration, it is possible to realize a building structure 1 capable of suppressing the eccentricity of the superstructure 5 and effectively reducing or absorbing seismic energy in the event of a large earthquake.

The seismic isolation device, seismic isolation system, and seismic isolation structure of the present invention are not limited to the above-described embodiments described with reference to the drawings, and various other modifications are made within the technical scope thereof. Can be considered.

For example, in the above embodiment, regarding the first seismic isolation device 20, the mounting plate 21 is attached to the upper structure 5 and the sliding plate 23 is attached to the lower structure 2, but the mounting plate 21 is not limited to this. May be attached to the lower structure 2 and the sliding plate 23 may be attached to the upper structure 5. That is, in this case, the structure of the laminated rubber portion 24 is upside down, and the low-rigidity first laminated rubber portion 25 provided on the mounting plate 21 side is on the lower side, and the second laminated rubber portion (axial force transmitter). ) 26 is located on the upper side, and the sliding material 31 is attached to the upper end of the laminated rubber portion 24 and is slidably abutted against the sliding plate 23 located further above. Further, the tubular portion (deformation range adjusting mechanism) 35 is provided so as to be relatively immovable with respect to the lower structure 2, that is, is joined so as to extend upward from the mounting plate 21, and the deformation region of the first laminated rubber portion 25 is formed. To adjust.
However, in this case, when the overturning moment acts during an earthquake and the superstructure 5 is partially lifted, the sliding material 31 and the sliding plate 23 are not joined, so that the gap is the sliding material 31. It can occur between the slide plates 23. Therefore, the fitting plate 27 and the mounting plate 21 may be integrally joined to each other. Further, in this case, the first seismic isolation device 20 is used for a part of a building structure having a low tower ratio, such as the inside of the building structure when viewed in a plan view, where a tipping moment is unlikely to act. Is desirable.
Further, in this case, the second seismic isolation device 40 may also be provided so that the low-rigidity first laminated rubber portion 45 is located on the lower side and the second laminated rubber portion 46 is located on the upper side.

Further, in the above embodiment, the axial force transmitter is the second laminated rubber portion 26, but for example, when there is no large difference in the amount of sinking of the building structure due to the combined use with other seismic isolation devices. Is not limited to this, and may be formed by a rigid body such as metal and act as a rigid sliding bearing.

Further, in the above embodiment, the deformation range adjusting mechanisms 35 and 55 are formed in a cylindrical shape, but the present invention is not limited to this, as long as the deformation regions of the first laminated rubber portions 25 and 45 are appropriately adjusted. , It may have any shape. For example, the deformation range adjusting mechanisms 35 and 55 are realized as rod-shaped members extending in the vertical direction from the mounting plates 21 and 41 at a plurality of locations such as eight locations around the laminated rubber portions 24 and 44. May be good.

Further, in the above embodiment, the tubular portions 35 and 55 are provided by being joined to the mounting plates 21 and 41, but the present invention is not limited to this and is realized as a member different from the mounting plates 21 and 41. , Apart from the mounting plates 21 and 41, the mounting plates 21 and 41 may be directly fixed to one of the fixed structures themselves.

Further, in the above embodiment, the laminated rubber portion 24 of the first seismic isolation device 20 and the laminated rubber portion 44 of the second seismic isolation device 40 reduce the input seismic energy by extending the period of the building structure. It was configured as. In addition to the above configuration, the laminated rubber portion 24 of the first seismic isolation device 20 and the laminated rubber portion 44 of the second seismic isolation device 40 are provided with a viscous damper such as an oil damper to provide a laminated rubber portion with a viscous damper. However, it may be configured to absorb seismic energy. Needless to say, even in such a configuration, the same effect as that of the above-described embodiment is obtained, such as suppressing the eccentricity of the superstructure 5.

In addition to this, as long as it does not deviate from the gist of the present invention, it is possible to select the configuration described in the above embodiment or change it to another configuration as appropriate.

1 Building structure (seismic isolation structure)
2 Substructure 5 Superstructure 20 1st seismic isolation device (seismic isolation device)
21 Mounting plate 21b Bottom surface 21s Recess 23 Sliding plate 24 Laminated rubber part 25 First laminated rubber part 25a Upper end 26 Second laminated rubber part (axial force transmitter)
27 Fitting plates 28c, 29c Outer peripheral edge (outer circumference)
31 Sliding material 35 Cylindrical part (deformation range adjustment mechanism)
40 Second seismic isolation device (laminated rubber bearing)
41, 43 Upper and lower mounting plates (two mounting plates)
41b lower surface (lower surface of the mounting plate of the laminated rubber bearing fixed to the upper structure)
41s recesses (recesses in the mounting plate of laminated rubber bearings fixed to the superstructure)
44 (Laminated rubber bearing) Laminated rubber part 45 (For laminated rubber bearing) First laminated rubber part 45a Upper end (Upper end of laminated rubber bearing)
46 Second laminated rubber part (for laminated rubber bearings) 47 (for laminated rubber bearings) Fitting plates 48c, 49c Outer peripheral edges (outer circumference of laminated rubber parts for laminated rubber bearings)
55 Cylindrical part (deformation range adjustment mechanism for laminated rubber bearings)
J Joint S Interval

Claims (6)

A seismic isolation system equipped with a first seismic isolation device and a second seismic isolation device between the upper structure and the lower structure of a building structure.
The first seismic isolation device is
A mounting plate fixed to either the upper structure or the lower structure, and
A sliding plate facing the mounting plate and fixed to the other structure,
A laminated rubber portion provided so as not to be relatively movable in the horizontal direction with respect to the mounting plate,
A sliding material provided on the sliding plate side of the laminated rubber portion and slidably abutted on the sliding plate, and
Equipped with
The laminated rubber portion includes a first laminated rubber portion provided on the mounting plate side and a second laminated rubber portion joined to the first laminated rubber portion and provided on the sliding plate side.
The first laminated rubber portion is formed to have lower rigidity than the second laminated rubber portion .
The first laminated rubber portion is provided so as to be horizontally immovable with respect to one of the structures so as to be horizontally spaced from the outer periphery of the laminated rubber portion, and the first laminated rubber portion can be deformed in the horizontal direction. Further equipped with a deformation range adjustment mechanism that adjusts the deformation area of the part ,
The second seismic isolation device is a laminated rubber bearing provided with two mounting plates fixed to the upper structure and the lower structure, and a laminated rubber portion provided between the two mounting plates.
The laminated rubber portion of the second seismic isolation device is joined to the first laminated rubber portion provided on the one structure side and the second laminated rubber portion provided on the other structure side. With a laminated rubber part,
The first laminated rubber portion of the second seismic isolation device is formed to have lower rigidity than the second laminated rubber portion of the second seismic isolation device.
The second seismic isolation device is provided so as to be immovable relative to one of the structures at a horizontal distance from the outer periphery of the laminated rubber portion, and the first laminated rubber portion can be deformed in the horizontal direction. However, it is further provided with a deformation range adjusting mechanism for adjusting the deformation region of the first laminated rubber portion.
A seismic isolation system characterized in that the vertical rigidity of the laminated rubber portion of the first seismic isolation device is substantially equal to the vertical rigidity of the laminated rubber portion of the second seismic isolation device . The mounting plate of the first seismic isolation device is fixed to the upper structure, and the sliding plate of the first seismic isolation device is fixed to the lower structure. The seismic isolation system according to claim 1, wherein the laminated rubber portion is provided above the laminated rubber portion of the first seismic isolation device . The mounting plate of the first seismic isolation device is provided with a recess on the lower surface facing the first laminated rubber portion of the first seismic isolation device.
A fitting plate that fits into the recess is provided at the upper end of the first laminated rubber portion of the first seismic isolation device .
The second aspect of claim 2, wherein the mounting plate of the first seismic isolation device can move relative to the laminated rubber portion of the first seismic isolation device by separating the fitting plate and the recess. Seismic isolation system . The first seismic isolation device is provided at a height position of a joint portion between the first laminated rubber portion and the second laminated rubber portion of the first seismic isolation device, wherein the deformation range adjusting mechanism is provided. The seismic isolation system described in any one of 3 to 3. The mounting plate of the second seismic isolation device fixed to the superstructure has a recess on the lower surface facing the laminated rubber portion.
A fitting plate that fits into the recess is provided at the upper end of the laminated rubber portion of the second seismic isolation device.
The first to fourth aspects of the second seismic isolation device, wherein the mounting plate of the second seismic isolation device can move relative to the laminated rubber portion in the vertical direction by separating the fitting plate of the second seismic isolation device from the recess. The seismic isolation system described in any one of the items. A seismic isolation structure having a seismic isolation system according to any one of claims 1 to 5 , wherein the superstructure has a tower ratio of 4 or more .
When the superstructure is viewed in a plan view, the first seismic isolation device is centrally provided in the center of the superstructure in the length direction, and the second seismic isolation device is provided at both ends in the length direction. Seismic isolation structure .

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