JP3717287B2 - Seismic isolation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is installed between two members spaced vertically, and absorbs kinetic energy due to relative displacement between these two members, particularly for civil engineering buildings such as bridges, buildings, and houses. The present invention relates to a seismic isolation device, which relates to a technique for protecting an upper structure from vibrations such as seismic motion by absorbing vibration energy such as seismic motion from the outside.
[0002]
[Prior art]
Conventionally, “laminated rubber bearings with lead plugs” are known as seismic isolation devices, which use shear deformation of laminated rubber to deform cylindrical lead plugs that are energy absorbers. is there. The lead plug is formed by opening a hole penetrating in the vertical direction in the central portion of a rubber laminate in which rubber and intermediate steel plates are alternately laminated, and enclosing the lead plug into the hole by pouring or press-fitting. The laminated body of rubber and intermediate steel plate is relatively hard in the vertical direction for the foundation and intermediate parts of civil engineering buildings, but has two degrees of freedom in the horizontal direction and is elastic to shear forces. It acts to allow various deformations. On the other hand, the lead plug as an energy absorbing material functions as a damper and acts to suppress vibration by absorbing vibration energy in the shear direction. This type of “laminated rubber bearing with lead plug” is disclosed as “periodic shear energy absorber” in Japanese Patent Application Laid-Open No. 52-49609.
[0003]
When encapsulating lead plugs in the holes of the rubber laminate, the volume of the lead should be about several percent larger than the volume of the holes, and the intermediate steel sheet will bite into the lead by applying pressure to the lead plugs. Interlocking is an important factor for exhibiting the damping effect due to plastic deformation of lead.
The “lead plug-containing laminated rubber bearing” constructed in this way functions as a stable energy absorbing material within a relatively small range of several tens of percent of shear strain, but the magnitude of shear strain is +/−. The limit is about 100%, and if a large shear strain is applied forcibly, the lead plug cracks and breaks during repeated deformation, resulting in a loss of energy absorption capability. The rubber itself can be deformed to a shear strain of 400% or more, but the metal lead can not withstand such a large shear strain and gradually enters the soft rubber layer to become a shape that is far from the initial shape and breaks. It ’s all over. In order to prevent this, the number of intermediate steel plates is increased to about 20 to 40.
[0004]
In order to cope with the problem of cracking or loss of energy absorption capability while the lead plug is repeatedly deformed, Japanese Patent Application Laid-Open No. 59-62742 discloses an “energy absorption device”, Japanese Patent Application Laid-Open No. 61-176676. In the “periodic shear energy absorbing device” disclosed in Japanese Patent Publication No. Hokukai, it is proposed to provide a restraining means composed of a flexible wall that allows deformation of the lead plug around the lead plug. However, these restraining means are made of a band material spirally wound around the lead plug, and it is difficult to cope with the case where the shear strain is very large.
[0005]
On the other hand, instead of inserting the lead plug into the rubber laminate, the lead plug alone is used as a damper by utilizing the energy absorption effect by plastic deformation of the lead itself. In this case as well, a reinforcing material is embedded inside to prevent breakage due to plastic deformation of lead (Japanese Patent Laid-Open No. 61-290245), or the surface is covered with a spiral wire (Japanese Patent Laid-Open No. 61-294230). No.), the outer circumference is covered with a steel ring that restricts the relative movement in the radial direction (Japanese Patent Laid-Open No. Sho 61-294232), and the outer circumference is closely attached with a plurality of steel body rings (specialized) Japanese Laid-Open Patent Publication No. 61-294234), and it has been proposed to wrap a steel strip having an S-shaped outer periphery in a spiral shape (Japanese Patent Laid-Open No. 62-274124). However, none of them has prevented lead from being broken for a long period of time, and has remained at a level where a slight life-prolonging effect is obtained.
[0006]
In addition, a plurality of sliding plates are slidable horizontally in a hollow portion along the vertical direction of an elastic support made of a flexible material such as rubber, and the load is applied only to the elastic support in normal times. In addition, there has been proposed a vibration isolator which is supported by a laminated body of sliding plates (Japanese Utility Model Publication No. 63-102806), and further between the elastic supporting body and the laminated body of sliding plates. An anti-vibration device in which a viscous substance is filled is proposed (Japanese Utility Model Publication No. 63-102807).
[0007]
[Problems to be solved by the invention]
A laminate of an elastic support, which is a flexible support formed by alternately laminating rubber and intermediate rigid plates in the vertical direction, and a sliding plate in which a plurality of sliding plates are slidably laminated in the horizontal direction. In conventional seismic isolation devices that support between two members including civil engineering buildings such as bridges, buildings, houses, etc., in general, they have a height and outer diameter that do not buckle even when a horizontal displacement occurs due to an earthquake. It is molded into a shape.
[0008]
In addition, in the vibration isolator disclosed in, for example, Japanese Utility Model Laid-Open No. 63-102806 and Japanese Utility Model Laid-Open No. 63-102807, in addition to the support by the elastic support made of a flexible material such as rubber, The load is distributed and supported by the laminated body of sliding plates, and the vibration damping effect is given by the frictional force of the sliding plate. However, with such conventional vibration isolator, sufficient vibration damping effect can be exhibited. There wasn't.
[0009]
Therefore, in the present invention, the seismic isolation bearing device is provided with good vibration damping performance and an optimal trigger function, so that slight earthquake motion can be transmitted to the structure with the vibration damping performance of the flexible bearing. This is a seismic isolation bearing device that absorbs and absorbs strong earthquake vibrations without transmitting vibrations to the structure with all vibration damping performances of elastic-plastic members, sliding plate laminates and flexible bearings. An object of the present invention is to provide a seismic isolation bearing device that can design the performance expression of the seismic isolation bearing device against seismic motion in the bearing itself.
[0010]
[Means for Solving the Problems]
In order to achieve such a problem, in the present invention, a flexible support formed by alternately laminating elastomer layers such as rubber and intermediate rigid plates in the vertical direction, and an iron alloy, copper or an alloy thereof, poly A sliding plate laminate in which sliding plates made of one or more of tetrafluoroethylene and graphite are stacked in the vertical direction, and the sliding plate laminate is surrounded by the flexible support body. The slide plate laminate has a structure in which some of the sliding bodies are made of a material having a different friction coefficient from that of the other sliding bodies. A seismic bearing device is provided.
[0011]
According to this seismic isolation bearing device, the sliding plate is made of a material having a relatively high friction coefficient and high vertical pressure, such as iron alloy, copper or its alloy, polytetrafluoroethylene, and graphite. Therefore, when a horizontal displacement occurs in the flexible bearing body, the elastomer layer and the sliding plate laminate work together, so it absorbs without transmitting vibration to the structure and resists earthquake motion. Produces a sufficient damping effect.
[0012]
Moreover, the flexible support body is provided with a hollow portion penetrating in the vertical direction, and the sliding plate laminate is disposed inside the hollow portion. In this case, the sliding plate is preferably a circular plate or an annular plate, and the number of stacked sliding plates is preferably the same as or larger than the number of stacked intermediate rigid plates.
[0013]
The elastomer layer is preferably a general-purpose rubber, a special rubber, a urethane, a thermoplastic elastomer, or a thermoplastic elastomer in which a vulcanized rubber is dispersed. On the other hand, the intermediate rigid plate is made of iron or an iron alloy plate.
It is preferable that the elastomer layer is fixed to the intermediate rigid plate by vulcanization adhesion, room temperature adhesion, or other methods.
[0014]
Further, the present invention provides a flexible bearing body mainly composed of an elastomer such as rubber, and a hollow portion formed by penetrating the flexible bearing body in the vertical direction between the inner periphery of the hollow portion. Inserted so as to penetrate vertically through the center hole of the sliding plate laminate inserted in a vertical direction so that the annular sliding plates can be slid relative to each other. An elasto-plastic member that absorbs kinetic energy, and a structure that supports the load in cooperation with the flexible support body and the sliding plate laminate is provided. The
[0015]
According to this seismic isolation bearing device, an elastic-plastic member made of lead or the like having excellent damping characteristics against vibration is inserted into the center hole of the sliding plate laminate, so that the flexible bearing body has a horizontal direction. The energy attenuating effect when this displacement occurs acts in a double manner on the sliding plate laminate and on the elastic-plastic member, so that a greater vibration attenuating effect can be exhibited.
[0016]
In addition, since there is a slight gap between the inner peripheral surface of the hollow portion of the flexible bearing body and the sliding plate, the annular sliding plate stacked on the hollow portion of the flexible bearing body is replaced with the flexible bearing body. Even if a horizontal displacement occurs, if the displacement in the horizontal direction is very slight, as in the case of an extremely slight earthquake, the annular sliding plate itself will not be displaced due to its frictional force, An effective trigger function is activated.
[0017]
Also in this case, the annular sliding plate is preferably made of one or more of iron alloy, copper or its alloy, polytetrafluoroethylene, and graphite. Similarly, the flexible support is preferably a flexible support formed by alternately laminating elastomer layers such as rubber and intermediate rigid plates in the vertical direction.
When the inner diameter of the hollow portion of the intermediate rigid plate of the flexible support is e and the outer diameter d of the sliding plate, these relationships are as follows.
[0018]
0 <(ed) / d <0.3,
Preferably, 0.01 <(ed) / d <0.1
Also, x is the total thickness of the elastomer layer, y is the total thickness of the intermediate rigid plate, a is the thickness of the annular sliding plate, and b is its ring width (outer diameter-inner diameter / 2). The relationship is as follows.
[0019]
3 * x / (x + y) <b / a
Preferably, 4 * x / (x + y) <b / a
Further, when the inner diameter of the sliding plate is c 1 and the outer diameter of the elastic-plastic member is p, these relationships are as follows.
0 <(cp) / p <0.3
Preferably, 0.01 <(cp) / p <0.15
By defining the dimensions of the intermediate rigid plate, the sliding plate, and the elastic-plastic member of the flexible support body as described above, the gap between these three members can be set within the optimum range. When the displacement in the horizontal direction is small in the flexible support body, if the displacement is very small, the displacement is applied to a part of the elastic-plastic member, the sliding plate laminate, the intermediate rigid plate, and the elastomer layer. It is transmitted. On the other hand, when the displacement is large, the displacement is transmitted to the entire elastic-plastic member, the sliding plate laminate, the intermediate rigid plate, and the laminated portion of the elastomer layer. The magnitude of the displacement is defined by the above equation 0 <(cp) / p <0.3. With this setting, an optimal trigger effect can be given when applying a horizontal displacement.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of the seismic isolation bearing device of the present invention. In the figure, a flexible support 10 is formed by laminating a large number of annular elastic plates or elastomer layers 11 made of a flexible material such as rubber and intermediate rigid plates 12 made of a thin steel material.
[0021]
The elastomer layer 11 is made of a crosslinked general-purpose rubber, special rubber, urethane, thermoplastic elastomer, or thermoplastic elastomer in which vulcanized rubber is dispersed. The elastomer layer 11 is not limited to a composition having a high damping property, and may be a composition having no damping property or a small damping property.
The intermediate rigid plate 12 is preferably made of iron or an iron alloy. The elastomer layer 11 and the intermediate rigid plate 12 are fixed to each other and laminated by vulcanization adhesion, room temperature adhesion, or other methods. The room-temperature curable adhesive may be one-pack type or two-pack type, but phenol adhesive, urethane adhesive, modified silicone adhesive, rubber adhesive, cyanoacrylate adhesive, epoxy adhesive, etc. Is mentioned. The type of adhesive used is appropriately determined according to the type of elastomer and intermediate rigid plate used, the required adhesive strength, and the like.
[0022]
The intermediate rigid plate iron alloy of the present invention refers to an alloy made of pure iron or iron and carbon. Therefore, examples of the iron and iron alloy of the present invention include pure iron, soft iron / steel (ordinary steel, carbon steel, special steel, alloy steel, etc.), iron and steel such as cast iron and pig iron. However, the iron or iron alloy used in the present invention is not limited to these.
An annular upper surface plate 14 and a lower surface plate 16 are concentrically bonded to the upper end surface and the lower end surface of the flexible support body 10 to form a hollow cylinder. Pressure receiving plates 15 and 17 are attached to the upper surface plate 14 and the lower surface plate 16 of the flexible support body 10 by bolts 18 and 19, respectively, and the upper and lower ends of the flexible support body 10 are closed.
[0023]
In the hollow portion 13 of the flexible support body 10, a plurality of sliding plates 20 stacked at almost the same height as the hollow portion 13 are connected to the inner peripheral surface of the hollow portion 13 of the flexible support body 10. Are accommodated with a slight gap 25 between them. The sliding plate 20 is formed into a flat plate shape from a material having a high pressure with respect to a compressive force, that is, an iron alloy, copper or an alloy thereof, polytetrafluoroethylene, or graphite. In this state, they are in contact with each other with a relatively high coefficient of friction and can slide in the horizontal direction.
[0024]
All of the sliding plates 20 may be made of the same material, but some of the sliding plates 20 are selected from materials having a different friction coefficient from other sliding plates, and a laminated body of the sliding plates 20 is used. Can be adjusted to produce the desired frictional force as a whole.
When the seismic isolation bearing device having the above configuration is installed between a structure such as a building and a floor surface such as the ground, the load applied in the vertical direction is the flexible bearing 10 in a normal upright state. Therefore, the flexible support 10 only needs to partially bear the entire load, and is supported by the area of both the entire plane of the sliding plate 20 and the entire plane of the sliding plate 20 laminated on the hollow portion 13. The compressive stress received by the flexible support 10 is smaller than that of a simple hollow body without a sliding plate.
[0025]
Further, when an earthquake occurs, as shown in FIGS. 2 and 3, the flexible support body 10 is displaced in the horizontal direction and tilted, and accordingly, the flexible support body 10 is moved in the horizontal direction. Since a pressing force is applied to the sliding plate 20 by the inner peripheral surface on the force receiving side, the sliding plate 20 moves in the horizontal direction while sliding against each other by this pressing force, and the flexible support 10 is deformed. It becomes a step shape inclined to the same shape as the time shape.
[0026]
Thus, when the flexible support body 10 is displaced in the horizontal direction, the flexible support body 10 is flexible in the overlapping portion area 24 projected vertically downward from the upper end surface 21 horizontally displaced with respect to the fixed lower end surface 22. The flexible bearing body 10 supports a part of the load in the vertical direction by the overlapping area 24a of the flexible bearing body 10, and most of the remaining load is a portion of the flexible bearing body 10 excluding the overlapping area 24a. Since the sliding plate 20 is supported by the overlapping area 24b, even in this case, the compressive stress generated in the flexible support body 10 does not increase.
[0027]
Therefore, even if the flexible support 10 is formed in a hollow shape, unlike a simple hollow body in which the sliding plate 20 is not laminated, the increase in the compressive strain of the flexible support 10 due to the vertical load is small, so The phenomenon can be greatly reduced.
Even when the sliding plate 20 stacked in the hollow portion of the flexible bearing 10 moves horizontally in accordance with the horizontal displacement of the flexible bearing 10 during the operation of the seismic isolation bearing device, the sliding plate Since 20 itself does not have a force to restore the original state, the horizontal spring constant of the flexible bearing 10 is not affected. In this case, since the sliding plate 20 is made of a material having a high friction coefficient such as iron alloy, copper alloy, polytetrafluoroethylene, graphite or the like as described above, the sliding plate 20 is slid when a force is applied in the horizontal direction. Energy absorption due to sliding of the moving plate 20 and energy absorption in the flexible support body 10 occur simultaneously, and a high vibration energy absorption effect is exhibited.
[0028]
FIG. 4 is a longitudinal sectional view showing a second embodiment of the seismic isolation bearing device of the present invention, and FIG. 5 is a longitudinal sectional view at the time of operation of the second embodiment. Similar to the first embodiment, the flexible support body 10 is formed by alternately laminating a large number of annular elastomer layers 11 made of rubber or the like and thin intermediate rigid plates 12, and annular or washer-shaped on the upper end surface and the lower end surface, respectively. The upper surface plate 14 and the lower surface plate 16 are bonded concentrically, the pressure receiving plates 15 and 17 are attached by bolts 18 and 19, respectively, and the upper and lower ends are closed.
[0029]
Each sliding plate 20 is the same as in the first embodiment in that it is made of any material of iron alloy, copper alloy, polytetrafluoroethylene, and graphite. In the second embodiment, each sliding plate 20 Is formed in the shape of an annular thin plate, that is, a washer.
An elastic-plastic member 30 made of lead called “lead plug” that absorbs kinetic energy is inserted so as to penetrate the central hole 32 formed by the laminated body of the washer-like sliding plates 20 in the vertical direction. A slight gap 34 is left between the inner peripheral surface of the center hole 32 of the laminated body of the sliding plates 20 and the elastic-plastic member 30. In addition, as in the case of the first embodiment, there is a slight gap 25 between the inner peripheral surface of the hollow portion 13 of the flexible support 10 and the sliding plate 20.
[0030]
These gaps 25 and 34 are set as follows. 5 shows various dimensions. When the inner diameter of the hollow portion 30 of the intermediate rigid plate 12 of the flexible support 10 is e and the outer diameter d of the washer sliding plate 20, these relationships are as follows. It shall be as follows.
0 <(ed) / d <0.3,
Preferably, 0.01 <(ed) / d <0.1
Further, when the inner diameter of the washer-shaped sliding plate 20 is c and the outer diameter of the elastic-plastic member 30 is p, these relationships are as follows.
[0031]
0 <(cp) / p <0.3,
Preferably, 0.01 <(cp) / p <0.15
During the operation of the seismic isolation bearing device, since there is a slight gap 25 between the inner peripheral surface of the hollow portion 13 of the flexible bearing body 10 and the sliding plate 20, the hollow portion of the flexible bearing body 10 is provided. If the horizontal displacement of the laminated washer-like sliding plate 20 is generated in the flexible bearing 10, even if the horizontal displacement is very small, as in the case of an extremely slight earthquake, the washer 20 The sliding plate 20 itself is not affected by the frictional force and does not cause a displacement, so that an effective trigger function acts.
[0032]
Furthermore, in this embodiment, there is the slight gap 34 as described above between the inner peripheral surface of the center hole 32 of the laminated body of the washer-like sliding plates 20 and the elastic-plastic member 30, so Even if a horizontal displacement of the laminated body of the moving plates 20 is caused by an earthquake motion, if it is very slight, the elastic-plastic member 30 is not displaced, and the trigger function acts stepwise.
[0033]
Next, it is preferable to set the dimensional relationship in the vertical direction in the seismic isolation bearing device as follows. That is, the total thickness of the elastomer layer 11 of the flexible support 10 is x, the total thickness of the intermediate rigid plate 12 is y, the thickness of the washer-like sliding plate is a, the ring width {(outer diameter -When (inner diameter) / 2} is b, these relations are as follows.
3 * x / (x + y) <b / a
Preferably, 4 * x <(x + y) <b / a
By defining in this way, the washer-like sliding plate 20 does not buckle even when a predetermined horizontal displacement occurs in the flexible bearing 10 when the seismic isolation bearing device shown in FIG. There is no possibility that the elastic-plastic member 30 made of lead protrudes from the center hole 32 of the laminated body of the washer-like sliding plates 20. In FIG. 5, the height h of the elastic-plastic member 30 is set so that the total thickness of the elastomer layer 11 is equal to the sum (x + y) of x and the total thickness y of the intermediate rigid plate 12.
[0034]
The number of elastomer layers 11 is set within a range of 2 to 200, and the number of intermediate rigid plates 12 is one smaller than the number of elastomer layers 11 because the upper and lower end portions are elastomer layers. .
Further, the elastomer layer 11 may be a composition having a high attenuation characteristic as described above, or a composition having no attenuation characteristic or a small attenuation characteristic. The hardness of the elastomer layer is preferably selected to be 0.1 to 20 MPa when G is 100%.
[0035]
In this embodiment, the load applied in the vertical direction is the entire plane of the flexible support 10 and the entire plane of the washer-like sliding plate 20 stacked in the hollow portion 13 in the normal upright state. And is almost supported by both areas. On the other hand, since the area of the elastoplastic member 30 is relatively small, it does not contribute much to the burden of load, but has a damping effect on the heel compared to the laminated body of the flexible support 10 and the washer-like sliding plate 20. It greatly contributes to the damping effect.
[0036]
FIG. 7 shows the relationship of the equivalent damping constant to the shear strain. Calculated values are calculated from the equivalent linear model described in “Chapter 4 Design of Seismic Isolation Equipment 4.3 Design of Laminated Rubber with Lead Plug” in the “Seismic Isolation Design Method Manual for Road Bridges” published by the Ministry of Construction, Public Works Research Institute. The result calculated based on the formula is shown. On the other hand, the actual measurement value indicates the bearing measurement result of the present invention. The specifications of the bearing are shown below.
Example 1
Elastomer layer: Shear stress 1.2 MPa at G = 175%
Elasto-plastic member: Lead plug (diameter 30mm)
Example 2
Elastomer layer: Shear stress 1.2 MPa at G = 175%
Elasto-plastic member: Lead plug (21 mm in diameter)
Comparative Example 1
Elastomer layer: Shear stress 1.2 MPa at G = 175%
Elasto-plastic member: Lead plug (diameter 30mm)
Comparative Example 2
Elastomer layer: Shear stress 1.2 MPa at G = 175%
The annular sliding plate of the present invention comprises at least one of iron or an alloy thereof, aluminum or an alloy thereof, iron alloy, copper or an alloy thereof, polytetrafluoroethylene, and graphite. Here, the iron alloy refers to pure iron and an alloy composed of iron and carbon. Accordingly, examples of the iron and iron alloy of the present invention include pure iron, soft iron / steel (ordinary steel, carbon steel, special steel, alloy steel, etc.), cast iron, pig iron, and other irons. It is not limited. On the other hand, the above copper alloys include Cu-Zn brass, Cu-Zn-Pb lead-containing brass, Cu-Zn-Sn tin-containing brass, Cu-Sn-P phosphor bronze, Cu-Al-based Aluminum bronze, Cu-Ni-based cupronickel, Cu-Ni-Zn-based white, Cu-Be-based beryllium copper, Cu-Ti alloy, Cu-Cr alloy, Cu-Zr alloy, Cu-Sn-based Examples include tin bronze and the like and alloys obtained by adding a small amount of alloy elements to these. However, the iron alloy or copper alloy used in the present invention is not limited to these. Furthermore, as a method for increasing the friction coefficient, the surface of these materials may be provided with unevenness or may be surface-treated with other materials.
[0037]
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, and various forms, modifications, and modifications are within the spirit and scope of the present invention. It should be noted that etc. are possible.
[0038]
【The invention's effect】
As described above, according to the present invention, by providing an optimal trigger effect to the seismic isolation bearing device, light seismic motion can be absorbed without transmitting vibration to the structure, resulting in strong seismic motion. On the other hand, a sufficient vibration damping effect can be produced, and an effective seismic isolation bearing device can be obtained for various buildings.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a first embodiment of a seismic isolation bearing device according to the present invention.
FIG. 2 is a plan view showing a state of the flexible support shown in FIG. 1 at the time of horizontal displacement.
3 is a longitudinal sectional view of the flexible support body and the sliding plate laminate in the state of FIG. 2;
FIG. 4 is a longitudinal sectional view of a second embodiment of the seismic isolation device of the present invention.
FIG. 5 is a plan view showing a state of the flexible support shown in FIG. 4 at the time of horizontal displacement.
6A and 6B are diagrams showing dimensions of each part of the seismic isolation bearing device according to the second embodiment, wherein FIG. 6A is a plan view of the seismic isolation bearing device, and FIG. 6B is a cross-sectional view of a washer-like sliding plate; C) is a side view and a plan view of an elastic-plastic member.
FIG. 7 shows the relationship of equivalent damping constant to shear strain.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Flexible support body 11 ... Elastomer layer 12 ... Intermediate | middle rigid board 13 ... Hollow part 14, 16 ... Upper and lower surface plates 15, 17 ... Pressure-receiving plate 20 ... Washer-like sliding plate 25 ... Gap 30 ... Elasto-plastic member (lead plug) )
32 ... Inner circumference 34 of sliding plate laminated body ... Gap

Claims (16)

A flexible support formed by alternately adhering and laminating elastomer layers such as rubber and intermediate rigid plates in the vertical direction, and a plurality of at least one of iron alloy, copper or its alloy, polytetrafluoroethylene, and graphite A sliding plate laminate in which the sliding plates are stacked in the vertical direction so as to be slidable with each other, and the sliding plate laminate is disposed so as to be surrounded by the flexible support body. Both of these have a structure that supports the load jointly, and some of the sliding plates of the sliding plate laminate are made of a material having a different friction coefficient from the other sliding plates. apparatus.   The seismic isolation bearing device according to claim 1, wherein a hollow portion penetrating in the vertical direction is provided in the flexible bearing body, and the sliding plate laminate is disposed in the hollow portion.   The seismic isolation bearing according to claim 1 or 2, wherein the sliding plate is a circular plate or an annular plate, and the number of stacked sliding plates is the same as or larger than the number of stacked intermediate rigid plates. apparatus. Wherein the elastomeric layer is crosslinked generic rubber, special rubber, urethane, according to any one of claims 1 to 3, characterized in that a thermoplastic elastomer thermoplastic elastomer or a vulcanized rubber dispersed, Seismic isolation device. The seismic isolation bearing device according to any one of claims 1 to 4 , wherein the intermediate rigid plate is made of iron or an iron alloy plate. The seismic isolation bearing device according to any one of claims 1 to 5 , wherein the elastomer layer is fixed to the intermediate rigid plate by vulcanization adhesion, room temperature adhesion, or other methods.   The annular slide plates inserted between the flexible support and the hollow portion provided through the flexible support in the vertical direction with a slight gap between the inner periphery of the hollow portion are slid relative to each other. A sliding plate stack that is vertically stacked so as to be movable, and an elastic-plastic member that absorbs kinetic energy inserted so as to penetrate the center hole of the sliding plate stack in the vertical direction. A base-isolated bearing device characterized in that the flexible bearing body and the sliding plate laminate jointly support a load. The seismic isolation bearing device according to claim 7 , wherein the elastic-plastic member is made of lead. The seismic isolation bearing device according to claim 7 or 8 , wherein the annular sliding plate is made of at least one of iron alloy, copper or an alloy thereof, polytetrafluoroethylene, and graphite. 10. The flexible support body according to any one of claims 7 to 9 , wherein the flexible support body is a flexible support body formed by alternately bonding and laminating elastomer layers such as rubber and intermediate rigid plates in the vertical direction. Seismic isolation device as described in the paragraph. When the inner diameter of the central hole of the intermediate rigid plate that defines the hollow portion of the flexible support body is e, and the outer diameter d of the annular sliding plate,
0 <(ed) / d <0.3
The seismic isolation bearing device according to claim 10 . When the total thickness of the elastomer layer is x, the total thickness of the intermediate rigid plate is y, the thickness of the annular sliding plate is a, and the ring width is b,
3 * x / (x + y) <b / a
The seismic isolation bearing device according to claim 10 or 11 , characterized in that When the inner diameter of the annular sliding plate is c and the outer diameter of the elastic-plastic member is p,
0 <(cp) / p <0.3
The seismic isolation bearing device according to any one of claims 10 to 12 , wherein: Sectional area of the horizontal direction of the elastic-plastic member, seismic isolation according to any one of claims 7 to 13, characterized in that this receive the load of the seismic isolation bearing device is not more than 10% of the total cross-sectional area Bearing device. Seismic isolation bearing device according to any one of claims 1 to 14, wherein the shear modulus of the sliding plate (G) is greater than the shear bullet resistance ratio of the elastomeric layer. The seismic isolation bearing device according to any one of claims 1 to 15 , wherein the elastomer layer has a shear stress of 0.1 to 20 MPa when the shear modulus (G) is 100%.

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