JP6752166B2 - Seismic isolation device - Google Patents

Description

The present invention relates to a seismic isolation device used for a seismic isolation structure such as a building or a mechanical device.

As a seismic isolation device that reduces the seismic force on a structure, a laminated rubber bearing in which rubber-like elastic plates and hard plates are alternately laminated is known. The laminated rubber bearing has high (hard) rigidity in the vertical direction and low (soft) rigidity in the horizontal direction, and is arranged in a seismic isolation layer such as a foundation portion of a structure or an intermediate layer.

The laminated rubber bearing supports the upper structure with rigid rigidity in the vertical direction, shears and deforms with soft rigidity in the horizontal direction, and transmits the shaking due to the earthquake in a slow cycle while supporting the load of the upper structure. The seismic force on the structure is reduced.

The laminated rubber bearing is designed based on the assumed seismic motion so that the supporting structure can withstand the seismic motion.

As research on long-period ground motions and earthquakes directly under faults progresses, the earthquake motions assumed in building design are increasing in size. In the case of a seismic isolated building, the increase in seismic motion leads to an increase in the displacement of the seismic isolation layer, which leads to an increase in the size of the laminated rubber bearings that make up the seismic isolation layer, resulting in a decrease in seismic isolation performance and a large clearance. The problem of conversion occurs.

Specifically, when the size of the laminated rubber bearing is increased, the spring constant is increased and the natural period is shortened, so that the seismic isolation performance is deteriorated.

On the other hand, in the seismic isolation layer, the above-mentioned laminated rubber bearing and the laminated rubber bearing are arranged on the slide plate, and the laminated rubber bearing is deformed and the laminated rubber bearing is slid on the slide plate. Bearings are known. This elastic sliding bearing has a structure that can improve the seismic isolation performance by following the large deformation of the seismic isolation layer relatively easily by increasing the size of the sliding plate without increasing the size of the laminated rubber bearing. There is also a demerit that the increase in size of the sliding plate causes a large cost increase in each process of manufacturing, transportation, and construction.

Against this background, there is a demand for a device that can follow a larger deformation than before, can suppress the deformation of the seismic isolation layer without deteriorating the seismic isolation performance, and is more compact than the conventional one.

As a configuration for improving seismic isolation performance following a large deformation, for example, a displacement suppression seismic isolation device used in the seismic isolation system shown in Patent Document 1 and Patent Document 2 is known.

In the displacement suppression seismic isolation device of Patent Document 1, shear keys are provided on the upper and lower surfaces of the laminated rubber arranged between the upper and lower structures, and the lower surface of the upper structure and the upper surface of the lower structure on which the laminated rubber is arranged are respectively. Lock members are provided at predetermined intervals so as to surround the shear key. The displacement suppression seismic isolation device does not support the building load, and when the building moves horizontally in the event of an earthquake, the lock member on the building side abuts on the shear key, and the horizontal movement of the building is restricted. After that, the seismic isolation performance is improved by the laminated rubber being largely deformed by shear deformation.

Further, the displacement suppression seismic isolation device of Patent Document 2 is provided with a shear key on the upper surface of the laminated rubber fixed to the foundation between the foundation and the building, and is locked on the lower surface of the structure so as to surround the shear key. The member is attached. When the building is deformed horizontally beyond a predetermined range with respect to the foundation, the lock member and the shear key come into contact with each other to restrict the movement in the horizontal direction, and the laminated rubber is sheared and deformed to exert a restoring force. It deforms greatly. This displacement suppression seismic isolation device does not support building loads.

Japanese Unexamined Patent Publication No. 2016-176576 Japanese Unexamined Patent Publication No. 2016-17574

However, in the conventional devices shown in Patent Documents 1 and 2, although they can follow a larger deformation than the conventional ones, they cannot independently bear the building load. Further, in the conventional elastic sliding bearing configuration, there is a problem that the sliding plate constituting the elastic sliding bearing becomes large in order to follow a large deformation. In addition, when forming an elastic sliding bearing with a conventional general configuration for large deformation, it is necessary to arrange a large sliding plate, and arrange the large sliding plate between the four corners of the building and the foundation. If so, it is difficult to arrange because a larger space is required.

The present invention has been made in view of this point, and can suppress deformation in the seismic isolation layer without deteriorating the seismic isolation performance, and can suppress deformation in the seismic isolation layer. The purpose is to provide a compact seismic isolation device that can withstand earthquakes in Japan.

One aspect of the seismic isolation device of the present invention is
A seismic isolation device that is placed between a superstructure and a substructure to support seismic isolation of the superstructure.
A sliding plate portion fixed to one of the superstructure and the substructure,
A laminate that is fixed to the other structure of the superstructure and the substructure, and is formed by alternately laminating a plurality of elastic plates and hard plates, and is capable of shear deformation in the horizontal direction, and the laminate. A laminated rubber bearing having an end sliding portion that is fixed on the one structure side and slidably abuts on the sliding plate portion on the one structure side surface.
With
The sliding plate portion is provided with a stopper pin that projects toward the end sliding portion side of the laminated rubber bearing.
The end sliding portion has a concave opening that opens on the surface of one of the structures, and the protruding portion of the stopper pin is accommodated inside the opening at a horizontal interval. The inner peripheral wall of the opening is provided with a horizontal movement restricting portion that regulates the movement in the horizontal direction relative to the stopper pin.

According to the present invention, deformation in the seismic isolation layer can be suppressed without deteriorating the seismic isolation performance, and it is compact enough to cope with large-scale earthquakes such as long-period ground motions and earthquakes directly under faults as well as small- and medium-sized earthquakes. A seismic isolation device can be realized.

It is a figure which shows typically the seismic isolation system to which the seismic isolation device of one Embodiment of this invention is applied. It is a vertical cross-sectional view which shows the seismic isolation device of one Embodiment of this invention. It is a top view of the laminated rubber bearing body of the seismic isolation device of one Embodiment of this invention. It is a partially enlarged view which shows one side part of the seismic isolation device shown in FIG. It is a figure which shows typically the operation of the seismic isolation device of one Embodiment of this invention. It is a figure which shows the relationship between the load and displacement of the seismic isolation device of one Embodiment of this invention. It is a vertical sectional view which shows the seismic isolation device which is a modification of one Embodiment of this invention. It is a figure which shows typically the operation of the seismic isolation device which is a modification of one Embodiment of this invention. It is a partial cross-sectional view which shows the main part structure of the seismic isolation device which is a modification of one Embodiment of this invention. It is a figure which shows the relationship between the load and displacement of the seismic isolation device which is a modification of one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram schematically showing a seismic isolation system 1 to which the seismic isolation device according to the embodiment of the present invention is applied.

The seismic isolation system 1 shown in FIG. 1 includes a plurality of laminated rubber bearings 5 as seismic isolation members arranged between a building 20 as a superstructure and a foundation 30 as a substructure, and a building 20. It has a seismic isolation device 10 arranged between the foundation 30 and the foundation 30. The seismic isolation system 1 seismically isolates the building 20 by means of the laminated rubber bearing 5 and the seismic isolation device 10. A retaining wall 33 is provided on the outer periphery of the seismic isolation system 10.

As the seismic isolation member of the seismic isolation system 1, in addition to the laminated rubber bearing 5 shown in FIG. 1, for example, a plugged laminated rubber, a high damping laminated rubber, an elastic sliding bearing, a rolling bearing or a damper, or a load bearing function can be used. Other seismic isolation devices such as a displacement suppression device having only a horizontal displacement suppression function may be used.

FIG. 2 is a vertical sectional view showing a seismic isolation device according to an embodiment of the present invention. FIG. 3 is a plan view of a laminated rubber bearing of the seismic isolation device according to the embodiment of the present invention.

The seismic isolation device 10 shown in FIGS. 2 and 3 is arranged in a seismic isolation layer between the building 20 as a superstructure and the foundation 30 as a substructure. The seismic isolation device 10 has a seismic isolation function as well as a load bearing function that constantly supports the building 20 and bears the load of the building 20.

The seismic isolation device 10 is fixed to the stopper pin 60 and the slide plate portion 70 fixed to one structure of the building 20 and the foundation 30, and to the other structure of the building 20 and the foundation 30. It has a laminated rubber bearing 40 and.

The seismic isolation device 10 may be arranged directly under the pillar of the building (superstructure) 20 and between the foundation 30, or between the four corners of the building 20 and the foundation 30. The seismic isolation device 10 allows the building 20 to move in the horizontal direction (horizontal direction in FIG. 2) relative to the foundation (substructure) 30 while supporting the vertical load of the building 20.

<Structure of laminated rubber bearing 40>
The laminated rubber bearing 40 is a laminated body 43 in which a plurality of elastic plates 41 and hard plates (here, intermediate steel plates) 42 are alternately laminated and integrated, and connecting steel plates fixed to both upper and lower ends of the laminated body 43. It has 44, 45, a flange 48, and an end steel plate (end sliding portion) 50. The connecting steel plate 44 and the flange 48, and the connecting steel plate 45 and the end steel plate 50 may be integrated into a flange configuration.

Examples of the elastic plate 41 include rubber materials such as natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, ethylene propylene rubber, butyl rubber, butyl halide rubber, and chloroprene rubber, but the elastic plate 41 is not particularly limited and is synthetic. It may be formed of a resin, a mixture of rubber and synthetic resin, or the like. The elastic plate 41 and the hard plate 42 are bonded to each other, and the connecting steel plates 44 and 45 arranged at the upper and lower ends of the laminate 43 composed of the elastic plate 41 and the hard plate 42 are adhered and integrated. In addition to the steel plate, the hard plate 42 may be a metal plate such as ceramic, plastic, fiber reinforced plastic, or a non-metal plate.

If necessary, a positioning hole 43a used in manufacturing may be provided in the central portion of the laminated body (elastic plate 41 and hard plate 42) 43 so as to penetrate vertically. The positioning hole 43a may be left empty, filled with an elastic body, or a damping plug such as a lead plug may be inserted. Further, a shear key 45a for fixing the connecting steel plate 45 and the end steel plate 50 is provided at the lower end of the central portion of the laminated body 43.

Further, the connecting steel plate 44 and the flange 48 are fixed by bolts 46, and the end steel plate 50 and the connecting steel plate 45 are fixed by bolts 47.

The outer peripheral surface of the laminated body 43 (the outer peripheral surface of the elastic plate 41 and the hard plate 42) is coated with a protective layer 49 made of a rubber material or the like having excellent weather resistance. The laminate 43 is protected from the external environment by the protective layer 49. Regarding the relationship between the protective layer 49 and the laminated body 43, the elastic plate 41 and the protective layer 49 may be bonded by applying an adhesive to the outer peripheral surface of the laminated body 43 or by wrapping a self-bonding tape. The rubber materials may be integrated by vulcanizing and adhering them at the same time.

The connecting steel plates 44 and 45 are metal plates, respectively, and are arranged in a state of sandwiching the laminated body 43. The connecting steel plates 44, 45 fix the laminated body 43 to the flange 48 and the end steel plate 50.

The flange 48 may be formed in any plan cross-sectional shape such as a rectangular shape, a disk shape, an elliptical shape, or a polygonal shape, but here, the flange 48 is formed in a disk shape, and together with the connecting steel plates 44 and 45, the flange 48 is more than the laminated body 43. An example having a large outer diameter will be described. The flange 48 fixes the laminate 43 together with the connecting steel plates 44 and 45 to the other structure (building 20) of the building (superstructure) 20 and the foundation (substructure) 30. Bolt holes 48a are drilled in the flange 48 at a predetermined interval in the circumferential direction, and bolt holes 48b having a counterbore on the upper surface side at a predetermined interval in the circumferential direction are formed along the circumferential direction. It is formed. The flange 48 is integrally formed by being fastened to the connecting steel plate 44 by a bolt 46 inserted from the upper surface side into the bolt hole 48b.

The end steel plate 50 is slidably arranged with respect to one side of the building (superstructure) 20 and the foundation (substructure) 30.

The end steel plate 50 is attached to a sliding plate portion 70 fixed to one of the upper structure (building 20) and the lower structure (foundation 30) (foundation 30) at one end face in the vertical direction. A sliding material (corresponding to a surface on one structure side) 51, which is a low friction material, abuts and is slidably arranged. Further, the end steel plate 50 is fixed to the laminate 43 fixed to the other of the superstructure (building 20) and the substructure (foundation 30) via the connecting steel plate at the other end face in the vertical direction. ..

In the present embodiment, the end steel plate 50 is fixed to the laminated body 43 on the upper surface via the connecting steel plate 45, and the sliding material 51 forming the lower surface abuts on the sliding plate portion 70, and is on the sliding plate portion 70. It is arranged so that it can be slidable. That is, the end steel plate 50 is a sliding material (low friction material) 51 integrally provided on the outer peripheral portion (peripheral portion of the opening of the opening 53) surrounding the concave opening 53, and the sliding plate portion 70 slides. It is in constant contact with the surface portion 72 and bears the building load.

The end steel plate 50 has a sliding member 51 and a movement restricting portion 54 that comes into contact with the stopper pin 60 and regulates the horizontal movement of the laminated rubber bearing 40. In the following description, the sliding material 51 and the movement restricting portion 54 will be described as facing the lower side of the end steel plate 50, but the present invention is not limited to this, and the sliding material 51 and the movement restricting portion 54 are directed to the upper side of the end steel plate 50. It may be arranged toward. That is, the sliding plate 51 may form the upper surface of the end steel plate 50, and the sliding surface portion 72 on which the sliding plate 51 slides may be provided on the superstructure.

The horizontal movement restricting portion 54 is formed in a concave shape that opens downward on the lower surface of the end steel plate 50. In the present embodiment, in the end steel plate 50, the horizontal movement restricting portion 54 is an inner peripheral wall portion (specifically, an inner wall portion) surrounding the opening 53 formed by opening in a circular shape in the central portion of the circular lower surface. It is formed on the peripheral surface). The opening 53 is housed so that the stopper pin 60 located at the center position on the lower end side of the inner peripheral wall does not come into contact with the opening 53, and the horizontal movement restricting portion 54 provided on the inner peripheral surface surrounding the opening 53 is the stopper pin 60. Is arranged so as to face each other in the horizontal direction. The stopper pin 60 housed inside the horizontal movement restricting portion 54 is always separated from the opening 53 surrounded by the horizontal movement restricting portion 54 in at least the horizontal direction in the horizontal direction and the vertical direction.

The horizontal movement restricting portion 54 comes into contact with the stopper pin 60 on the surface to regulate the movement in the horizontal direction relative to the stopper pin 60. The horizontal movement restricting portion 54 is continuous with a shape portion (relief portion 542 shown in FIG. 4) in which the upper end portion of the inner peripheral surface of the inner peripheral wall is retracted toward the outer peripheral side from the lower end portion in the inner peripheral wall portion surrounding the opening 53. It is provided. That is, the inner peripheral wall of the opening 53 has a relief portion 542, which is a recess recessed in the outward direction in the radial direction, at the end portion on the inner side of the opening 53. Further, the horizontal movement restricting portion 54 is formed on the inner peripheral wall on the opening side of the opening 53 from the relief portion 542 which is a recess, and is connected to the relief portion 542.
The relief portion 542 is a recess formed on the inner peripheral wall so as to be recessed in the radial and outward directions at the end portion on the building 20 side, which is one of the structures. The horizontal movement restricting portion 54 is formed so as to project from the relief portion 542, which is a recess on the inner peripheral wall, to the opening end side and to the center side of the opening 53. Further, the relief portion 542 has a taper 541 that is inclined in the radial direction upward, and the taper 541 is a tapered surface that expands in diameter toward the back side of the relief portion 542. Specifically, the taper 541 is one surface that reaches the bottom of the relief portion 542 that is a recess at the upper part of the horizontal movement restricting portion 54, and the relief portion 542 that is the recess is one of the structures on the building 20 side. That is, it is a tapered surface that inclines toward the outer periphery of the opening 53 toward the building 20 side by expanding the diameter toward the back side of the opening 53.

As a result, the horizontal movement restricting portion 54 comes into contact with the root side of the stopper pin 60 and has a taper 541. Therefore, when the horizontal movement restricting portion 54 and the stopper pin 60 move relatively horizontally, the stopper pin 60 Is hard to come out from the opening 53. The horizontal movement restricting unit 54 does not have to have the relief part 542, and even if it has a structure having the relief part 542, the relief part 542 may not have the taper 541.

FIG. 4 is a partially enlarged view showing one side of the seismic isolation device shown in FIG.
As shown in FIGS. 2 to 4, the end steel plate 50 has a horizontal movement restricting portion 54 located inside the end steel plate 50 from the outside of the end steel plate 50, that is, from the periphery of the laminated rubber bearing 40. A through hole 55 is formed so that the inside of the inner opening 53 can be confirmed.

In the present embodiment, the through hole 55 extends in the horizontal direction and in the radial direction around the opening 53, and extends inside the horizontal movement restricting portion 54, as shown in FIG. Is formed so as to communicate with the outside of the end steel plate 50. Through the through hole 55, the state of the stopper pin 60 arranged inside the horizontal movement restricting portion 54 is confirmed. The confirmation method may be visually recognized from the outside through the through hole 55, or may be confirmed by inserting a fiberscope into the through hole 55 from the outside of the end steel plate 50. Further, although the through hole 55 has been described for inspection, the present invention is not limited to this, and oil or the like may be injected through the through hole 55. In the present embodiment, four laminated rubber bearings 40 are formed at equal intervals in the radial direction in a plan view, but one or more may be used.

On the lower surface of the end steel plate 50, the sliding member 51 is arranged so as to be horizontal so as to surround the opening edge of the opening 53.

The end steel plate 50 is formed with bolt holes 57, 58 through which bolts 47, 47 for fixing the end steel plate 50 to the connecting steel plate 45 are inserted.

The bolt holes 57 and 58 are formed so as to be inserted into the end steel plate 50 from the lower surface side, which is the sliding member 51 side.

The bolt holes 57 and 58 have counterbore portions 571 and 581 which are opened on the lower surface side of the end steel plate 50 and accommodate the head of the bolt 47 to be inserted, respectively. The bolts 47, 47 inserted into the bolt holes 57, 58 are bolts of the connecting steel plate 45, with the shaft portion protruding from the upper surface of the end steel plate 50 while the head portion is brought into contact with the bottom surface of the counterbore portions 571, 581. The head is housed in the counterbore 571 and 581 while being screwed and fixed to the hole.

As shown in FIG. 4, the bolt holes 57 formed on the lower surface of the end steel plate 50 and in the arrangement region of the sliding member 51 are flush with the lower surface of the end steel plate 50 at the opening edge. It is closed by a lid portion 573 provided on the.

As a result, the bolt holes 57 on the lower surface of the end steel plate 50 are completely closed by the sliding material 51, and the end steel plate 50 slides smoothly with respect to the sliding plate portion 70 by the sliding material 51 on the lower surface thereof. It is an easy smooth plane.

The sliding material 51 has a plate shape, and in the present embodiment, it is formed of a resin such as a fluororesin such as PTFE (polytetrafluoroethylene), but the sliding material 51 is not limited to this. Any member may be formed as long as it has a small friction coefficient and is preferably slidable when the sliding member 51 abuts and slides. The sliding material 51 may be formed of one sheet, or a plurality of small plate-shaped materials may be attached to the bottom surface of the end steel plate 50. In the present embodiment, since the bottom surface of the end steel plate 50 is annular, the sliding material 51 may be formed in an annular shape and attached, or a plurality of small circular or square surface materials may be attached in an annular shape. You may wear it.

<Slip plate part 70>
The sliding plate portion 70 is fixed to the foundation 30, and the laminated rubber bearing 40 fixed to the building 20 is slidably contacted with the sliding plate portion 70.

The sliding plate portion 70 has a sliding surface portion 72 that the laminated rubber bearing 40 slidably contacts, and is provided with a stopper pin 60 that projects to the surface side that becomes the sliding surface portion 72.

On the sliding plate portion 70, the lower surface of the laminated rubber bearing 40, that is, the sliding material 51 on the lower surface of the end steel plate 50 is placed on the sliding surface portion 72.

The sliding surface portion 72 has an outer diameter larger than the outer diameter of the laminated rubber bearing 40.

In the present embodiment, the sliding plate portion 70 has a base plate 71, and a sliding material serving as a sliding surface portion 72 is laid on the upper surface of the base plate 71, and a stopper pin 60 is provided on the base plate 71 at the center of the sliding surface portion 72. It is projected through.

The sliding material as the sliding surface portion 72 is, for example, a metal plate (stainless steel) having a smooth flat surface, and the base plate 71 functions as a reinforcing plate for reinforcing the sliding surface portion 72.

The base plate 71 is formed in a rectangular shape in the present embodiment, but is not limited to this, and may be a disk shape, an elliptical shape, or a polygonal plate shape.

The base plate 71 is fixed to the upper surface of one of the superstructure and the substructure (here, the foundation 30) to which the flange 48 is fixed. In the present embodiment, the base plate 71 is formed in a rectangular shape, in detail, in a square shape, and as shown in FIG. 3, the base plate 71 is formed in the bolt holes 75 formed at the four corners where the sliding surface portion 72 is not arranged. It is integrally fixed to the foundation 30 by a bolt (not shown).

The base plate 71 and the sliding surface portion 72 are smaller than the amount of movable range in the seismic isolation layer including the deformation of the laminated rubber bearing 40.

<Stopper pin 60>
The stopper pin 60 is housed in the horizontal movement restricting portion 54. The outer peripheral surface of the stopper pin 60 faces the inner peripheral surface of the horizontal movement restricting portion 54 in the horizontal direction. Here, the outer peripheral surface of the stopper pin 60 faces the inner peripheral surface of the horizontal movement restricting portion 54 over the entire circumference thereof, and when the stopper pin 60 moves relative to the horizontal movement restricting portion 54, The end steel plate 50, that is, the laminated rubber bearing 40, is restricted from moving in the horizontal direction by abutting on the inner peripheral surface of the horizontal movement restricting portion 54. The stopper pin 60 is formed of, for example, a member such as chrome molybdenum steel.

In the present embodiment, the horizontal cross section of the stopper pin 60 is formed concentrically with the horizontal movement restricting portion 54.

The shape of the stopper pin 60 is not particularly limited, and may be polygonal or tubular in addition to the columnar shape. However, when the stopper pin 60 is horizontally moved in all directions, it may be evenly contacted with the horizontal movement restricting portion 54. Is preferably circular together with the opening shape of the horizontal movement restricting portion 54.

Further, the stopper pin 60 preferably has a protruding length within the horizontal movement restricting portion 54 so as to be separated from the top surface of the horizontal movement restricting portion 54.

In the present embodiment, the laminated rubber bearing 40 configured in this way is arranged together with the sliding plate portion 70 between the bottom of the pillar of the building 20 and the foundation 30. The laminated rubber bearing 40 is in contact with one side of the building 20 and the foundation 30 on one surface of the upper and lower end surfaces, and is fixed to the other side of the building 20 and the foundation 30 on the other surface of the upper and lower end surfaces. In the present embodiment, the laminated rubber bearing 40 is placed on the sliding plate portion 70 fixed to the foundation 30, and the bolt inserted into the bolt hole 48a at the peripheral edge of the flange 48 in the building 20. It is fixed by 81.

In the laminated rubber bearing 40, the laminated body 43, the flange 48, and the end steel plate 50 support the building 20 with rigid rigidity in the vertical direction, that is, have a load bearing function and shear deformation with soft rigidity in the horizontal direction. In other words, by having a seismic isolation function, the shaking caused by the earthquake is transmitted in a slow cycle while supporting the load of the building 20.

The sliding surface portion 72 may be formed of a coating layer having a low sliding resistance by subjecting the sliding surface portion 72 together with the sliding material 51 on the end steel plate 50 side to a low friction treatment. The coating layer may be formed by polishing, or may be used as a sliding material such as a fluororesin such as PTFE.

<Operation of seismic isolation device 10>
FIG. 5 is a diagram schematically showing the operation of the seismic isolation device according to the embodiment of the present invention.

In the seismic isolation device 10, when there is a seismic motion in the state shown in FIG. 5A, as shown in FIG. 5B, the laminated rubber bearing 40 and the foundation 30 (specifically, the sliding plate portion 70 fixed to the foundation 30). ) And relatively horizontally displaced. Specifically, the laminated rubber bearing 40 moves in the direction of arrow A (see FIG. 5A) with respect to the foundation 30 that moves in the direction of arrow A (see FIG. 5B).

If the relative movement of the laminated rubber bearing 40 and the foundation 30 due to the earthquake motion is within the opening 53 surrounded by the horizontal movement restricting portion 54, the laminated rubber bearing 40 slides with respect to the foundation 30 and the building 20 It will be horizontally displaced together with. Due to the sliding horizontal displacement of the laminated rubber bearing 40, the laminated rubber bearing 40 slides in the horizontal direction with respect to the building 20.

In addition, when this seismic motion is an unexpectedly large seismic motion such as a long-period pulsed seismic motion or a long-period / long-term seismic motion, the laminated rubber bearing 40 has a horizontal movement restricting unit with respect to the foundation 30. Attempts to make a horizontal displacement relative to the movement range regulated by the 54 and the stopper pin 60. Here, the moving range corresponds to the diameter of the opening 53, and since the stopper pin 60 actually uses the center of the opening 53 as the reference position, the opening 53 in all directions horizontal with the reference position as the reference position. Corresponds to the radius. Next, the stopper pin 60 comes into contact with the inner peripheral surface of the horizontal regulating portion 54 of the laminated rubber bearing 40 that moves relatively in the A direction, and a horizontal force acts on the laminated rubber bearing 40. Then, as shown in FIG. 5C, in the laminated rubber bearing 40, a horizontal force (shearing force) is applied to the laminated body 43 in a state where the stopper pin 60 is in contact with the inner peripheral surface of the horizontal movement restricting portion 54 of the end steel plate 50. ) Works, and the laminated body 43 is shear-deformed without bending and deforming. That is, in the laminated body 43, the horizontal displacement of the foundation (substructure) 30 with respect to the building (superstructure) 20 is the amount of horizontal displacement (stopper pin 60 and horizontal movement regulation) in the opening surrounded by the horizontal movement restricting portion 54. When the clearance between the inner peripheral surface of the portion 54 is exceeded), the movement in the horizontal direction is restricted by the stopper pin 60 and the horizontal movement restricting portion 54, and the horizontal movement is sheared and deformed. As a result, a reaction force is generated in the laminated rubber bearing 40, and the horizontal rigidity of the seismic isolation device 10 increases.
In this way, when the seismic isolation device 10 receives a horizontal displacement due to an external force such as an earthquake, the laminated rubber bearing 40, which is the main body of the seismic isolation device 10, slides on the sliding plate portion 70. Further, when the horizontal displacement becomes large and the horizontal movement restricting portion 54 surrounding the opening 53 of the end steel plate 50 comes into contact with the stopper pin 60, the laminated body 43 is sheared and deformed to generate a restoring force and suppress the displacement. It will be possible.

In the present embodiment, the stopper pin 60 is located at the center position of the horizontal length of the opening 53 in the opening 53 surrounded by the horizontal movement restricting portion 54, that is, the inner peripheral surface arranged in an annular shape. Since it is arranged with the center of the above as the reference position, it corresponds to the relative movement in all directions around the stopper pin 60.

Further, in the seismic isolation device 10, the stopper pin 60 is provided at the center (center portion) of the end steel plate 50, specifically, the opening 53 surrounded by the horizontal movement restricting portion 54 in a plan view. Even if an excessive displacement that twists the structure occurs due to an earthquake, the shearing force can be reliably transmitted to the laminated body 43, and the restoring force as designed can be applied to the entire seismic isolation layer.

FIG. 6 is a diagram showing the relationship between the load and the displacement of the seismic isolation device according to the embodiment of the present invention.

As shown in FIG. 6, when the laminated rubber bearing 40 and the sliding plate portion 70 are relatively horizontally displaced due to earthquake motion, the laminated rubber bearing is supported in the range R1 until the stopper pin 60 comes into contact with the horizontal movement restricting portion 54. The body 40 only slides with respect to the sliding plate portion 70, and no load is applied to the laminated body 43, so that it can respond to small and medium-sized earthquake motions.

Then, when the laminated rubber bearing 40 and the sliding plate portion 70 are relatively horizontally displaced due to a large-scale earthquake motion, the stopper pin 60 abuts on the horizontal movement restricting portion 54 and the movement of the end steel plate 50 is restricted. The laminated body 43 is shear-deformed in the range of R2. The seismic isolation device 10 can be greatly deformed on the small sliding plate portion 70, and when it is desired to be greatly deformed, the restoring force of the laminated body 43 acts to exert a force to reduce the deformation of the seismic isolation device 10.
In this way, by incorporating a sliding mechanism into the structure of the laminated rubber 43, which is a laminated rubber of a size (for example, 800φ) corresponding to small and medium-sized seismic motion, the seismic isolation layer is exempted while extending the limit deformation. It is possible to minimize the installation area of the seismic isolation device 10.

The seismic isolation device 10 of the present embodiment is a seismic isolation device that is arranged between the building 20 that is a superstructure and the foundation 30 that is a substructure and supports the building 20 for seismic isolation. The seismic isolation device 10 has a sliding plate portion 70 fixed to one of the upper structure and the lower structure (foundation 30), and a laminated rubber bearing 40. The laminated rubber bearing 40 is fixed to the other structure (building 20) of the upper structure and the lower structure, and is formed by alternately laminating a plurality of elastic plates 41 and hard plates 42, and is horizontal. A laminated body 43 that can be sheared and deformed in the direction, and a laminated body 43 that is fixed on one structure (foundation 30) side and slides on the sliding plate portion 70 on the surface (sliding material 51) on the one structure (foundation) side. It has an end steel plate 50, which is an end sliding portion that movably abuts. The sliding plate portion 70 is provided with a stopper pin 60 projecting toward the end steel plate 50, which is an end sliding portion of the laminated rubber bearing 40. The end steel plate 50, which is an end sliding portion, is opened on the surface on the side of the foundation 30 which is one of the structures, and the stopper pin 60 is housed inside at least in the horizontal direction of the horizontal direction and the vertical direction. It has a concave opening 53 to be formed. Further, in the end steel plate 50, the inner peripheral wall that surrounds the opening 53 and is arranged so as to face the stopper pin 60 in the horizontal direction is restricted from moving in the horizontal direction relative to the stopper pin 60. A horizontal movement regulation unit 54 is provided. That is, the end steel plate 50, which is the end sliding portion, has a concave opening 53 that opens on the surface on one side of the structure (foundation 30), and the protruding portion of the stopper pin 60 is inside the opening 53. It is housed at least horizontally in the horizontal direction and in the vertical direction. Further, the horizontal movement restricting unit 54 is provided on the inner peripheral wall of the opening 53, and the horizontal movement restricting unit 54 regulates the movement in the horizontal direction relative to the stopper pin 60A. The laminated body 43 undergoes shear deformation in the moving direction of the horizontal movement restricting portion 54 after the stopper pin 60 and the horizontal movement restricting portion 54 relatively move in the horizontal direction and come into contact with each other.

According to the seismic isolation device 10, the laminated body 43 of the laminated rubber bearing 40 does not function in case of an expected small- or medium-sized earthquake, and the laminated rubber bearing 40 and the sliding plate portion 70 slide together. The seismic isolation effect is exhibited by the movement and the contact between the horizontal movement regulating portion 54 and the stopper pin 60.

In addition, in the event of excessive displacement due to an unexpectedly large earthquake, the stopper pin 60 and the inner peripheral surface of the horizontal movement restricting portion 54 come into contact with each other, so that the laminated rubber bearing 40 is in contact with the reaction force (shear force) against the horizontal force (shear force). A considerable reaction force) is generated in the stopper pin 60. In this way, by adding the horizontal rigidity of the laminated rubber bearing 40, the horizontal rigidity of the seismic isolation device 10 is increased, and the displacement of the building 20 can be suppressed.

According to this embodiment, it is possible to follow a large deformation without making the laminated body 43 and the sliding plate portion 70 large while maintaining the seismic isolation effect and the load bearing capacity. Further, even during a large deformation, a restoring force that tries to restore the deformation acts on the laminated body 43. As a result, in addition to the expected small and medium-sized earthquakes that can be dealt with by the relative slip of the laminated rubber bearing 40 and the sliding plate portion 70, it is possible to seismically isolate against an unexpected large earthquake.

Further, in the conventional elastic sliding bearing configuration in which the laminated rubber is placed on the sliding plate, it is necessary to make the sliding plate larger than the deformation amount of the laminated rubber in the seismic isolation layer in order to cope with a large earthquake. Compared with the conventional elastic sliding bearing having such a configuration, in the present embodiment, the sliding plate is not made larger than the amount of deformation in the seismic isolation layer.
Further, in a seismic isolation structure in which laminated rubber is arranged between the upper and lower structures (in the present embodiment, the building 20 and the foundation 30) and the upper and lower end surfaces of the laminated rubber are fixed to the upper and lower structures, the laminated rubber is large. To make it deformable, it is necessary to increase the outer diameter of the laminated rubber itself. In addition, if the laminated rubber is made larger, the rigidity becomes harder, and the seismic isolation received by the soft elasticity will not be effective for small and medium-sized earthquakes. On the other hand, in the seismic isolation device 10 of the present embodiment, the laminated rubber bearing 40 as a whole slides on the sliding plate portion 70 without enlarging the laminated body 43 and the sliding plate portion 70. A small-scale earthquake is seismically isolated, and then a large-scale earthquake is seismically isolated by shear deformation of the laminated body 43 of the laminated rubber bearing 40.

As a result, it is possible to make the entire seismic isolation device 10 capable of seismic isolation of small, medium-sized, and large-scale large-scale earthquakes, and by extension, to make the installation space compact. Further, by making the seismic isolation device 10 as a whole compact, it becomes easy to transport the seismic isolation device 10 itself to the site and to install the seismic isolation device 10.
Further, unlike the conventional elastic sliding bearing, the stopper by the stopper pin 60 functions at a constant displacement, so that the laminated rubber bearing as the sliding bearing does not protrude from the sliding plate portion 70 even if a huge earthquake occurs.
As described above, according to the present embodiment, deformation in the seismic isolation layer can be suppressed without deteriorating the seismic isolation performance, and along with small and medium-sized earthquakes, huge-scale earthquakes such as long-period ground motions and earthquakes directly under faults. It is possible to realize a compact seismic isolation device that can also be used.

In the seismic isolation device 10, since the stopper pin 60 is arranged at the center of the concave opening of the horizontal movement restricting portion 54, the horizontal movement is restricted by changing the outer diameter of the stopper pin 60 and the concave opening 53. The change of the contact timing with the portion 54 can be freely set.
In the present embodiment, after the occurrence of the earthquake, the stopper pin 60 is at a reference position at equal intervals from the horizontal movement restricting portion 54 arranged in a circumferential shape, that is, the stopper pin 60 is at the center position of the opening 53. If it is not located in, a restoration spring or a laminated rubber for undoing the deformation of the laminated rubber bearing 40 and positioning the laminated rubber bearing 40 in the reference position is separately provided. As a result, the seismic isolation device 10 may be returned to the original reference position when the earthquake has subsided.

<Modification example>
FIG. 7 is a vertical cross-sectional view showing a seismic isolation device which is a modified example of the embodiment of the present invention, and FIG. 8 is a diagram schematically showing the operation of the seismic isolation device which is the modified example. FIG. 9 is a partial cross-sectional view showing a main configuration of a modified example of the embodiment of the present invention. Note that FIG. 9 shows the horizontal movement restricting portion 54A and the stopper pin 60A during movement.

The seismic isolation device 10A shown in FIGS. 7 to 9 is a modified example of the seismic isolation device 10 corresponding to the first embodiment shown in FIGS. 2 to 5, and has the same basic configuration as the seismic isolation device 10. The same components are designated by the same reference numerals, and the description thereof will be omitted.

In the seismic isolation device 10A, the shape of the stopper pin 60A in which the notch 62 is formed is different from that of the seismic isolation device 10, and other configurations are the same.

Compared with the seismic isolation device 10, the seismic isolation device 10A allows the stopper pin 60A to slide after breaking by opening the horizontal movement by the stopper pin 60A, and the seismic isolation device 10 seismically isolates the device. It enables seismic isolation of giant earthquakes that have even greater seismic motion than giant earthquakes.
The seismic isolation device 10A includes a stopper pin 60A and a sliding plate portion 70A fixed to one of the building 20 and the foundation 30, and a laminated rubber bearing 40A fixed to the other of the building 20 and the foundation 30. Have.

Similar to the seismic isolation device 10, the seismic isolation device 10A is arranged directly under the pillar of the building (superstructure) 20 and between the foundations 30, or between the four corners of the building 20 and the foundation 30. May be good. At that time, it may be arranged together with the laminated rubber bearing 5 (see FIG. 1). The seismic isolation device 10A supports the vertical load of the building 20 and enables the building 20 to move in the horizontal direction (for example, the left-right direction in FIG. 7) relative to the foundation (substructure) 30. ..

<Structure of laminated rubber bearing 40A>
The laminated rubber bearing 40A is a laminated body 43 in which a plurality of elastic plates 41 and hard plates (here, intermediate steel plates) 42 are alternately laminated and integrated, and a connecting steel plate fixed to both upper and lower ends of the laminated body 43. It has 44, 45, a flange 48, and an end steel plate 50A. The connecting steel plate 44 and the flange 48, and the connecting steel plate 45 and the end steel plate 50A may be integrated into a flange configuration.

The end steel plate 50A is slidably arranged with respect to one side of the building (superstructure) 20 and the foundation (substructure) 30.

Specifically, the end steel plate 50A, like the end steel plate 50, is formed on the other end face in the vertical direction of the superstructure (building 20) and the substructure (foundation 30) via the connecting steel plate. It is fixed to the laminated body 43 fixed to the other side. Further, the end steel plate 50A is a sliding material which is a low friction material on the sliding plate portion 70A fixed to one of the upper structure (building 20) and the lower structure (foundation 30) at one end surface in the vertical direction. It abuts at 51 and is slidably arranged.

In the present embodiment, the end steel plate 50A is fixed to the laminate 43 on the upper surface via the connecting steel plate 45, and the sliding material 51 forming the lower surface abuts on the sliding plate portion 70A, and is on the sliding plate portion 70A. It is arranged so that it can be slidable.

The end steel plate 50A has a sliding member 51 and a horizontal movement restricting portion 54A that abuts on the stopper pin 60A and regulates the horizontal movement of the laminated rubber bearing 40A.

The horizontal movement restricting portion 54A is formed in a concave shape by opening downward on the lower surface of the end steel plate 50A. In the present embodiment, the horizontal movement restricting portion 54A is provided on the inner peripheral surface surrounding the opening 53A formed by opening the end steel plate 50A in the central portion of the circular lower surface in a circular shape. The opening 53A houses the stopper pin 60A inside, and the horizontal movement restricting portion 54A on the inner peripheral surface surrounding the opening 53A is arranged so as to face the stopper pin 60A in the horizontal direction. The stopper pin 60A housed inside the horizontal movement restricting portion 54A is always separated from the opening 53A surrounded by the horizontal movement restricting portion 54A in at least the horizontal direction in the horizontal direction and the vertical direction.
The horizontal movement restricting portion 54A is continuously provided on the inner peripheral wall portion surrounding the opening 53A in a shape portion (relief portion 542) in which the upper end portion of the inner peripheral surface of the inner peripheral wall is retracted toward the outer peripheral side from the lower end portion. ing. That is, the inner peripheral wall (specifically, the inner peripheral surface) surrounding the opening 53A is a relief portion 542 which is a concave portion recessed in the radial outward direction at the inner end of the opening 53A, similarly to the opening 53. have. The relief portion 542 is connected to the horizontal movement restricting portion 54A and has a taper 541 that inclines upward in the radial direction. The taper 541 of the relief portion 542 is a tapered surface whose diameter increases toward the back side of the relief portion 542.
As a result, the horizontal movement restricting portion 54A surrounding the opening 53A is a lower portion of the inner peripheral wall surrounding the opening 53A that protrudes toward the opening 53A from the upper end side, and is a tip at the protruding portion 60b of the stopper pin 60A. It comes into contact with the contact portion 64 on the root side before that. The horizontal movement regulating unit 54A does not have to have the escape unit 542. Further, the end steel plate 50A has through holes 55, bolt holes 57, 58 and the like, similarly to the end steel plate 50.

<Slip plate part 70A>
The sliding plate portion 70A is fixed to one of the upper structure (building 20) and the lower structure (foundation 30), and is fixed to the other of the upper structure (building 20) and the lower structure (foundation 30). The laminated rubber support 40A is slidably abutted. The sliding plate portion 70A is formed in the same manner as the sliding plate portion 70.

The sliding plate portion 70A has a sliding surface portion 72 that the laminated rubber bearing 40A slidably contacts, and is provided with a stopper pin 60A that projects to the surface side that becomes the sliding surface portion 72.

<Stopper pin 60A>
A portion of the stopper pin 60A that protrudes from the sliding surface portion 72 is housed in the horizontal movement restricting portion 54A. The stopper pin 60A has a concave notch 62 extending in the circumferential direction on the outer peripheral surface in the same configuration as the stopper pin 60, and other configurations are the same as those of the stopper pin 60.

When the stopper pin 60A presses the horizontal movement restricting portion 54A, the notch 62 is suitably broken so as to eliminate the protruding portion 60b from the surface of the sliding surface portion 72. The notch 62 is between the protruding portion 60b protruding from the upper surface of the sliding plate portion 70A and the root side portion 60a below the upper surface of the sliding plate portion 70A or below the same position as the upper surface on the outer peripheral surface of the stopper pin 60A. Is formed in (see FIG. 9). The notch 62 is formed in the protruding portion 60b along the lower side of the contact portion 64 near the root side portion 60a of the stopper pin 60A. The notch 62 is formed so that its deepest portion is located below the surface of the sliding surface portion 72.
As a result, when the contact portion 64 presses the horizontal movement restricting portion 54A and receives a predetermined reaction force, that is, after the laminated body 43 is sheared and deformed, a crack is formed starting from the notch 62 and the stopper pin 60A It will be broken.
In the present embodiment, the notch 62 is formed in the circumferential direction over the entire circumference of the outer peripheral surface of the stopper pin 60A, but the present invention is not limited to this, and the stopper pin 60A hits the horizontal movement restricting portion 54A with a predetermined displacement amount. Any structure may be used as long as the stopper pin 60A breaks and the protruding portion 60b comes off when they come into contact with each other.

<Operation of seismic isolation device 10A>
In the seismic isolation device 10A, when there is a seismic motion in the state shown in FIG. 8A, as shown in FIG. 8B, the laminated rubber bearing 40A and the foundation 30 (specifically, the sliding plate portion 70A fixed to the foundation 30). ) And relatively horizontally displaced. Specifically, due to vibration, the laminated rubber bearing 40A moves, for example, in the direction of arrow A (see FIG. 8A) with respect to the foundation 30 that moves in the direction of arrow A (see FIG. 8B).

If the movement is within the opening 53A of the horizontal movement restricting portion 54A, the laminated rubber bearing 40A slides with respect to the foundation 30 and is horizontally displaced together with the building 20. Due to the sliding horizontal displacement of the laminated rubber bearing 40A, small and medium-sized seismic motions with respect to the building 20 are seismically isolated.

When this seismic motion is an unexpectedly large seismic motion such as a long-period pulsed seismic motion or a long-period / long-term seismic motion, the laminated rubber bearing 40A, like the laminated rubber bearing 40, is attached to the foundation 30. Therefore, the horizontal movement restricting portion 54A and the stopper pin 60A attempt to make a relative horizontal displacement beyond the movement range regulated by the stopper pin 60A. The moving range corresponds to the diameter of the opening 53A, and the stopper pin 60A actually uses the center of the opening 53A as a reference position. Therefore, the moving range is a horizontal opening in all directions centered on the reference position. Corresponds to the radius of part 53A.

As a result, the stopper pin 60A further moves in the direction of arrow A and comes into contact with the horizontal regulating portion 54A of the laminated rubber bearing 40A that moves relatively in the direction of arrow A. As a result, a horizontal force acts on the laminated rubber bearing 40A. Then, as shown in FIG. 8C, in the laminated rubber bearing 40A, the laminated body is in a state where the stopper pin 60A is in contact with the horizontal movement restricting portion 54A forming the inner peripheral surface of the opening 53A in the end steel plate 50A. A horizontal force (shearing force) acts on the 43, and the laminated body 43 is sheared and deformed without being bent and deformed. That is, in the laminated body 43, the horizontal displacement of the foundation (substructure) 30 with respect to the building (superstructure) 20 is the horizontal displacement amount (stopper pin 60A and the peripheral wall surface surrounding the opening 53A) in the horizontal movement restricting portion 54A. When the clearance between the two is exceeded, the movement in the horizontal direction is restricted by the stopper pin 60A and the horizontal movement restricting portion 54A, and the displacement is sheared in the horizontal direction. As a result, a reaction force is generated in the laminated rubber bearing 40A, and the horizontal rigidity of the seismic isolation device 10A increases. The deformation of the laminated body 43 exempts the seismic motion of a huge earthquake.

Further, when the foundation 30 moves horizontally in the arrow-A direction due to a large earthquake motion, the horizontal force is received by the stopper pin 60A and then the reaction force is received by the horizontal movement restricting portion 54A which is the lower part of the inner peripheral wall that abuts. Then, it is pressed in the direction of arrow A. Then, the stopper pin 60A breaks at the notch 62 portion. In the stopper pin 60A, the notch 62 for breaking the stopper pin 60A is formed so that the fracture surface of the lower member (root side portion 60a embedded in the base plate 71) after breaking does not protrude upward from the sliding surface portion 72. Will be done. Specifically, the deepest portion of the notch 62, which is the starting point of the crack, is formed so as to be located below the surface of the sliding surface portion 72. As a result, the breakage of the stopper pin 60A occurs below the sliding surface portion 72 when the horizontal regulating portion 54A abuts and presses against the abutting portion 64 as shown in FIG. The fracture surface, which is the upper surface of the root side portion 60a after fracture, is located below the sliding surface between the sliding surface portion 72 and the sliding plate 51, and does not protrude from the sliding surface portion 72.
Then, as shown in FIG. 8D, the stopper pin 60A is broken into the buried portion 60a and the protruding portion 60b by the horizontal movement restricting portion 54A, and the restriction on the sliding surface portion 72 of the end steel plate 50A is released. .. As a result, the end steel plate 50A slides in the direction of arrow A with respect to the sliding plate portion 70A again. By sliding, that is, slipping, the end steel plate 50A, it is possible to seismically isolate the seismic motion of a huge earthquake against the building 20.

FIG. 10 is a diagram showing the relationship between the load and the displacement of the seismic isolation device, which is a modified example of the embodiment of the present invention. In FIG. 10, mu _0: friction coefficient of the end steel plate 50A side of the sliding member 51, _{K S:} a shearing spring constant of the laminated body 43, _{F S} is the breaking load of the stopper pin 60A, [delta] ₁ is the slip It is a stroke, δ ₂ is a shear deformation of the laminated body, and δ ₃ is a slip deformation after the stopper pin is broken. Note that FIG. 10 shows the relationship between the load and displacement of the seismic isolation device, an example of the load received by the seismic isolation device, and the displacement range of each part of the seismic isolation device corresponding to the received load.

As shown in FIG. 10, in the seismic isolation device 10A, when the sliding plate portion 70A and the laminated rubber bearing 40A are relatively horizontally displaced due to the seismic motion, the laminated rubber bearing 40A receives a load.
First, in the seismic isolation device 10A, until the sliding plate portion 70A and the laminated rubber bearing 40A are relatively horizontally displaced ( _{0 to} δ ₀ ), that is, until the load applied to the laminated body 43 reaches the shear spring constant. Seismic isolation is performed by receiving a load due to slight vibration caused by wind or traffic vibration.
When a load larger than a slight vibration, for example, a load due to a small or medium-sized earthquake (small and medium-sized earthquake) is applied to the seismic isolation device 10A, the laminated rubber bearing 40A slides with respect to the foundation in the seismic isolation device 10A, that is, It slides within the sliding stroke range (δ _{0 to} δ ₁ ) until it comes into contact with the stopper pin 60A, thereby isolating small and medium-sized earthquakes. Next, when a load larger than that of a small or medium-sized earthquake, that is, a load due to a large earthquake (for example, M (Magnitude) 7 or more and less than M8) is applied to the seismic isolation device 10A, in the seismic isolation device 10A, the laminated rubber bearing 40A has a stopper pin 60A. A large earthquake is seismically isolated within the range (δ _{1 to} δ ₂ ) in which the laminated body 43 undergoes shear deformation until the stopper pin 60A breaks. When a load of a super-giant earthquake (for example, M (magnitude) 8 or more) larger than a large earthquake is applied to the seismic isolation device 10A, the seismic isolation device 10A deforms the laminated rubber bearing 40A after the stopper pin 60A breaks. Seismic isolation for huge earthquakes within the sliding stroke range (δ _{2 to} δ ₃ ).

That is, the seismic isolation device 10A of the modified example exhibits a characteristic of functioning as a sliding bearing again by inserting a notch 62 in the stopper pin 60A and breaking this portion in advance. This prevents the laminated body 43 from breaking and enables further large deformation (corresponding to δ2-δ3).

As shown in FIG. 10, according to the seismic isolation device 10A as a modified example, the same effect as that of the seismic isolation device 10 can be obtained. That is, according to this seismic isolation device 10A, it is possible to follow a large deformation without increasing the size of the laminated rubber bearing 40A and the sliding plate portion 70A while maintaining the seismic isolation effect and the load bearing capacity, and the material cost is accompanied by this. , Transportation costs and construction costs can be reduced. Further, unlike the conventional sliding bearing, the stopper pin 60A functions at a constant displacement of the laminated rubber bearing 40A, so that the laminated rubber bearing 40A does not protrude from the sliding plate portion 70A even if a huge earthquake occurs. Further, when the stopper pin 60A functions, the laminated body 43 begins to be deformed. In small and medium-sized earthquakes, it exerts a soft seismic isolation effect due to elastic slip, and in a huge earthquake, the restoring force of the laminated body 43 suppresses excessive displacement.
In this way, the seismic isolation device 10A functions against micro-vibrations caused by wind, traffic vibration, etc., so that the habitability of the seismic isolation object (building 20) is not impaired, and small and medium-sized earthquakes and large earthquakes occur. And it works against huge earthquakes and can be seismically isolated regardless of the magnitude of the earthquake. Further, even if the diameter of the member which is the outer diameter of the seismic isolation device 10A, such as the sliding plate portion, is made smaller than the conventional one, it has a large deformation ability as compared with the conventional one.

In addition, when the displacement of the laminate + the shear deformation of the laminated body 43 is exceeded, that is, when the earthquake motion of an unexpected super-giant earthquake is received, the stopper pin 60A is broken to perform the sliding deformation of the laminated body. It is possible to prevent the 43 from breaking. In this modification, a restoration spring or laminated rubber is separately provided, and the seismic isolation device 10A is returned to the original position when the earthquake subsides. When applied to the seismic isolation system 1 shown in FIG. 1, the laminated rubber bearing 5 functions as a restoring spring or a laminated rubber, and when the earthquake subsides, the seismic isolation device 10A is restored to its original position.

The seismic isolation device 10 of the present embodiment and the seismic isolation device 10A of the modified example are applied to the seismic isolation system 1 installed between the upper and lower structures, but the present invention is not limited to this, and a weight or the like synchronized with vibration may be used. It may be connected to a mass body and applied to a dynamic vibration absorber such as a Tuned Mass Damper (TMD).

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.
The embodiments of the present invention have been described above. The above description is an example of a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. That is, the description of the configuration of the seismic isolation devices 10 and 10A and the shape of each part is an example, and it is clear that various changes and additions to these examples are possible within the scope of the present invention.

The seismic isolation device according to the present invention has a function of supporting an elastic sliding bearing, can have a seismic isolation effect against a larger earthquake motion than an unexpected large earthquake, may cause a huge earthquake motion, and has a small installation space. It is useful as a seismic isolation device that can be placed in layers.

10, 10A Seismic isolation device 20 Building 30 Foundation 40, 40A Laminated rubber bearing 41 Elastic plate 42 Hard plate 43 Laminated body 44, 45 Connecting steel plate 45a Shear key 46, 47, 81 Bolt 48 Flange 48a, 48b, 57, 58 , 75 Bolt hole 49 Protective layer 50, 50A End steel plate (end sliding part)
51 Slip material 53, 53A Opening 54, 54A Horizontal movement regulation part 55 Through hole 60, 60A Stopper pin 70, 70A Slip plate part 71 Base plate 72 Sliding surface part 43a Positioning hole 571,581 Counterbore part 573 Lid part

Claims (3)

A seismic isolation device that is placed between a superstructure and a substructure to support seismic isolation of the superstructure.
A sliding plate portion fixed to one of the superstructure and the substructure,
A laminate that is fixed to the other structure of the superstructure and the substructure, and is formed by alternately laminating a plurality of elastic plates and hard plates, and is capable of shear deformation in the horizontal direction, and the laminate. A laminated rubber bearing having an end sliding portion that is fixed on the one structure side and slidably abuts on the sliding plate portion on the one structure side surface.
With
The sliding plate portion is provided with a stopper pin that projects toward the end sliding portion side of the laminated rubber bearing.
The end sliding portion has a concave opening that opens on the surface of one of the structures, and the protruding portion of the stopper pin is accommodated inside the opening at a horizontal interval. The inner peripheral wall of the opening is provided with a horizontal movement restricting portion that regulates the movement in the horizontal direction relative to the stopper pin.
Seismic isolation device. The inner peripheral wall has a concave portion recessed outward in the radial direction at the inner end of the opening.
The horizontal movement restricting portion is formed on the inner peripheral wall in connection with the recess on the opening side of the opening from the recess.
The seismic isolation device according to claim 1. The recess has a tapered surface that expands in diameter toward the back of the opening.
The seismic isolation device according to claim 2.

Images