JP3282801B2 - Seismic isolation bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding bearing for seismic isolation.

[0002]

2. Description of the Related Art A seismic isolation sliding bearing is provided between an upper structure and a lower structure of a structure to allow a relative horizontal displacement between the upper structure and the lower structure and to reduce a weight of the upper structure. It is a device to support. The seismic isolation sliding bearing slidably abuts a horizontal sliding surface defined by a member coupled to the superstructure of the building and a horizontal sliding surface defined by a member coupled to the substructure of the building. In many cases, the horizontal sliding surface on the lower structure side is defined by the surface of stainless steel, and the horizontal sliding surface on the upper structure side is defined by the surface of ethylene tetrafluoride resin. The smaller the frictional force acting between the stainless steel surface and the tetrafluoroethylene resin surface in contact with each other, the better seismic isolation performance is obtained, but the load applied to the contact surface is generally very large Therefore, it is difficult to sufficiently reduce the frictional force acting between them. Therefore, in practice, the seismic isolation sliding bearing does not slide unless the seismic acceleration applied to the substructure of the structure is large enough. In other words, the initial stiffness before sliding out of the stationary state and the unloading stiffness when sliding out in the opposite direction are large, so high-frequency components are input to the upper structure before sliding out, and as a result, excitation of higher-order modes of the upper structure is excited. As a result, the reduction rate of the acceleration is reduced, and the seismic isolation performance is reduced. Conventionally, in order to overcome this drawback, a seismic isolation device has been used in which a laminated rubber is stacked on a sliding bearing for seismic isolation so that the sliding bearing for seismic isolation and the laminated rubber are connected in series. When seismic isolation of a structure is performed using this type of seismic isolation device, this type of seismic isolation device is generally used in combination with a seismic isolation device consisting of only laminated rubber without a sliding bearing. I am trying to do it. If a big earthquake occurs,
In a seismic isolation device in which a seismic isolation sliding bearing and laminated rubber are stacked, the sliding bearing slides out, reducing the horizontal force applied to the superstructure from the seismic isolation device.
The natural vibration period of the superstructure of the structure is prolonged, and excellent seismic isolation performance is obtained.

[0003]

As described above, a seismic isolation sliding bearing attached to a laminated rubber stack is an extremely useful seismic isolation device having excellent seismic isolation performance. Since the manufacturing cost of the laminated rubber is added to the manufacturing cost of the sliding bearing, it is expensive, and the height of the seismic isolation device as a whole increases. The present invention has been made in view of the above circumstances,
An object of the present invention is to have a good seismic isolation performance approaching that of a conventionally used seismic isolation sliding bearing in which laminated rubber is attached in series, while manufacturing it at a much lower cost than that type of seismic isolating sliding bearing. It is an object of the present invention to provide a seismic isolation sliding bearing that can be made smaller in height.

[0004]

In order to achieve the above object, a seismic isolation sliding bearing according to the present invention is provided between an upper structure and a lower structure of a structure. The upper structure and lower structure of a seismic isolation bearing that supports the weight of the upper structure while allowing the horizontal displacement to suppress the transmission of horizontal vibration from the lower structure to the upper structure. And a smooth first
A first assembly defining a horizontal sliding surface; and a second assembly coupled to the other of the upper structure and the lower structure of the structure, the second assembly defining a smooth second horizontal sliding surface. When the surface and the second horizontal sliding surface are in sliding contact with each other, a vertical load is supported by the sliding surfaces, and a relative horizontal displacement between the first assembly and the second assembly is allowed. The second assembly includes a fixed-side support structure fixed to a structure, a low-friction material layer including a tetrafluoroethylene resin sheet defining the second horizontal sliding surface, and the low-friction material layer. A low-friction material layer support structure defining a horizontal support surface to support, and a horizontally extending rubber interposed and connected between the fixed-side support structure and the low-friction material layer support structure And the rubber sheet is horizontal. By shearing deformation direction, Yes as the horizontal direction of the vibration transmission from the lower structure of the structure to the upper structure is suppressed, the stationary support structure,
The low friction material layer support structure is constituted by a pedestal block having an upward horizontal plane and a downward horizontal plane, and the pedestal block is one of the pedestal blocks. Is connected to the horizontal surface of the flange plate via the rubber sheet, and the other horizontal surface supports the resin sheet as the low-friction material layer, and in the second assembly, An area ratio of the rubber sheet to an area is 2 to 5, and the pedestal block or the flange plate includes a shear deformation suppressing portion in contact with an outer peripheral surface of the rubber sheet.
In the rubber sheet, the shear deformation suppressing portion suppresses the horizontal shear deformation in a part of the thickness direction, and the horizontal shear deformation is allowed in the remaining region in the thickness direction. Features. Further, in the present invention, the thickness of the area in the thickness direction of the rubber sheet in which the horizontal shear deformation is allowed is 1 mm to 30 mm.
The thickness is within the range of up to mm.

According to the seismic isolation sliding bearing of the present invention,
When the substructure of a structure vibrates due to an earthquake or the like,
The rubber sheet interposed between the fixed-side support structure fixed to the structure and the low-friction material layer that defines the horizontal sliding surface shears in the horizontal direction, causing vibration from the lower structure to the upper structure. Transmission is suppressed. Further, by appropriately determining the thickness of the rubber sheet, the magnitude of the initial rigidity of the sliding bearing for seismic isolation can be adjusted. Furthermore, even when the horizontality of the first horizontal sliding surface or the horizontal level of the second horizontal sliding surface is not good due to a construction error, the rubber sheet is elastically deformed, thereby preventing the sliding surfaces from hitting each other. can do. In addition, these effects can be realized with a seismic isolation sliding bearing at a much lower cost than conventionally used seismic isolation sliding bearings in which laminated rubber is provided in series.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1A is a side view of a seismic isolation sliding bearing according to a first embodiment of the present invention installed on a structure, and FIG. 1B is a cross-sectional side view showing an enlarged main portion of the sliding bearing. a is the second of the present invention installed on a structure
It is a side view of the sliding bearing for seismic isolation according to the embodiment of the present invention,
FIG. 3B is an enlarged sectional side view showing a main part thereof, FIGS. 3A and 3B are schematic restoring force characteristic diagrams for explaining the operation of the seismic isolation sliding bearing according to the present invention, and FIG. It is sectional side view of the principal part for demonstrating the modified form of the 1st seismic isolation sliding bearing. Many parts of the seismic isolation bearing 10 of FIG. 1 and the seismic isolation bearing 10 ′ of FIG. 2 have the same structure. Therefore, the same structural parts will be described first, and then the structural parts unique to the respective seismic isolation bearings 10, 10 'will be described. In the following description,
The sliding bearing for seismic isolation is simply called "sliding bearing".

In FIGS. 1 and 2, the sliding bearings 10, 1
0 ′ is disposed between the upper structure 14 and the lower structure 12 of the structure, and supports the weight of the upper structure 14 while allowing the relative horizontal displacement between the upper structure 14 and the lower structure 12. Is what you do. The substructure 12 of the structure is, for example, the foundation of a building fixed to the ground, and the superstructure 14 of the structure in that case is the body part of the building supported by the foundation. . Sliding bearing 10,
10 ′ includes a first assembly 16 and a second assembly 18,
18 '. The first assembly 16 is coupled to the lower structure 12 and the second assembly 1
8, 18 'are connected to the superstructure 14. The structure of the first assembly 16 is different from that of the sliding bearing 10 and that of the sliding bearing 1.
It is completely the same as that of 0 '. On the other hand, the structure of the second assembly is not the same and is indicated by different reference numerals 18 and 18 '. The first assembly 16 defines a smooth first horizontal sliding surface 20 made of a surface of stainless steel, and the second assemblies 18, 18 'are made of a surface of a low friction material, tetrafluoroethylene resin. Smooth second
A horizontal sliding surface 22 is defined. The first horizontal sliding surface 20 and the second horizontal sliding surface 22 are in sliding contact with each other, so that the first assembly 16 and the second assembly 18, 18 ' Relative horizontal displacement is allowed.

[0008] The first assembly 16 includes a lower flange plate 24 made of a steel plate having a square shape in plan view. A steel plate template 28 supported by a non-shrink mortar layer 26 is fixed to the lower structure 12, and a plurality of cylindrical nuts 30 are welded to the template 28. The lower flange plate 24 is fastened to the template 28 by anchor bolts 32 screwed to the cylindrical nuts 30, thereby being fixed to the lower structure 12. The upper surface of the lower flange plate 24 is a thin stainless steel plate 34
Covered with. The thickness of the stainless steel plate 34 is, for example, 4 mm, and the surface of the stainless steel plate 34 is polished and finished smoothly, so that the first horizontal sliding surface 20 is formed.
Is defined.

Regarding the second assemblies 18, 18 ',
As will be described in more detail below, it will be noted that both the second assembly 18 of FIG. 1 and the second assembly 18 ′ of FIG.
4; a low friction material layer defining the second horizontal sliding surface 22; and a low friction material layer support defining a horizontal support surface for supporting the low friction material layer. And a horizontally extending rubber sheet interposed between the fixed-side support structure and the low-friction material layer support structure. On the other hand, the second assembly 18 of FIG. 1 and the second assembly 18 ′ of FIG. 2 are different mainly in the configuration of the fixed-side support structure and the arrangement position of the low-friction material layer.

In the sliding bearing 10 of FIG. 1, the fixed-side support structure of the second assembly 18 is constituted by an upper flange plate 36 made of a steel plate having a square shape in plan view. Superstructure 14
Is manufactured using a steel formwork 38, and a plurality of cylindrical nuts 40 are welded to the steel formwork 38. The upper flange plate 36 is fastened to the steel formwork 38 by anchor bolts 42 screwed to the cylindrical nuts 40,
It is fixed to the upper structure 14. The upper flange plate 36 extends horizontally, and its lower surface defines a horizontal plane. The low friction material layer support structure of the second assembly 18 includes:
It is composed of an upright cylindrical pedestal block (pedestal block) 44 whose height is smaller than its diameter. The central portion of the lower surface of the pedestal block 44 slightly projects downward, and the downward projecting portion has a circular shape corresponding to the size of a circular tetrafluoroethylene resin sheet 46 described later. The end face of the projection defines a downward horizontal plane. Also, the upper surface of the pedestal block 44
It defines an upward horizontal plane.

The low-friction material layer is made of a tetrafluoroethylene resin sheet 46, and the second assembly 18 shown in FIG.
And the second assembly of FIG. 2 uses the same.
The ethylene tetrafluoride resin sheet 46 is formed by cutting a sheet having a thickness of 3 mm into a circle having a diameter of 300 mm. However, the values of these thicknesses and diameters show specific examples, and it goes without saying that these values are variously set according to actual use conditions. It is also possible to use various fluorocarbon resin sheets having a low friction and a high strength other than the tetrafluoroethylene resin sheet, and it is also possible to use other low friction materials. Fluoroethylene resin sheet is easily available and is considered to be a suitable material at this time.
Commercialized under the trademark). Further, the low friction material layer does not necessarily have to be formed of a sheet-like material, but may be formed by coating a low friction material on the horizontal support surface of the low friction material layer support structure. The rubber sheet 48 is a sheet of a rubber material similar to the material used for the rubber layer of the general seismic isolation laminated rubber. I'm using The values of these thicknesses and diameters also show specific examples, and these values are set variously according to actual use conditions. However, as described later, the thickness of the rubber sheet 48 has a suitable range, and it is preferable that the thickness be within the range.

The rubber sheet 48 has its upper surface adhered to the lower surface of the upper flange plate 36 and its lower surface adhered to the upper end surface of the pedestal block 44 so as to be centered. An appropriate method such as using a sulfuric adhesive may be used. As a result, the pedestal block 44 has one upper horizontal surface connected to the horizontal surface (lower surface) of the upper flange plate 36 via the rubber sheet 48. On the other horizontal surface, which is the lower end surface of the pedestal block 44, an ethylene tetrafluoride resin sheet 46 is adhered.

According to the above structure, the rubber sheet 48 is interposed between the low friction material layer made of the tetrafluoroethylene resin sheet 46 and the upper structure 14 of the structure. Therefore, if the lower structure 12 of the structure vibrates in the horizontal direction due to an earthquake or the like, even if the vibration acceleration is small,
Even in the case where the low friction material layer made of the tetrafluoroethylene resin sheet 46 does not slide out with respect to the first assembly 16 fixed to the lower structure 12, the rubber sheet 48 is elastically sheared and deformed in the horizontal direction. Horizontal vibration transmission from the lower structure 12 to the upper structure 14 is suppressed.
That is, if the tetrafluoroethylene resin sheet 46 is fixed to the upper structure 14, the restoring force characteristic diagram of the sliding bearing is a substantially rectangular graph as schematically shown in FIG. Whereas the sliding bearing 1 according to the present invention
At 0, since the rubber sheet 48 undergoes elastic shear deformation, its restoring force characteristic diagram becomes a substantially parallelogram graph as schematically shown in FIG. 3B. The inclination of the left and right sides of the substantially parallelogram graph indicates the magnitude of the initial rigidity of the sliding bearing 10.

The thickness of the rubber sheet 48 is determined so that the natural period of the upper structure 14 of the structure supported by the sliding bearing 10 that changes according to the initial rigidity of the sliding bearing 10 has a desired value. I do. That is, if the natural period is represented by Ts (generally, the natural period is represented by Ts = 0.3 sec.
2.0 seconds), and the thickness tr of the rubber sheet 48 is represented by the following equation. tr = (G · α · Ts ² · g) / (4π ² · σ _t ) In this equation, G is the shear modulus of the rubber that is the material of the rubber sheet 48, and α is the ethylene tetrafluoride resin sheet 46.
Is the ratio of the area of the rubber sheet 46 to the area of g, g is the acceleration of gravity (= 980 cm / s ² ), and σt is the surface pressure of the ethylene tetrafluoride resin sheet 46. If general numerical examples are given, G = 4 to 12 kgf / cm ² , σ _t = 200 to 6
00 kgf / cm ² and α = approximately 2 to 5, and the thickness tr of the rubber sheet 48 in this case is from several mm to several tens mm. However, if the thickness tr of the rubber sheet 48 is too large, the vertical rigidity becomes too small, and thus the thickness has a suitable range. This preferred range is thinner when soft rubber is used, and thicker when hard rubber is used. However, as in the embodiment of FIG. In the case where the shear deformation in the horizontal direction is allowed in the entire area in the direction, it is preferable that the thickness of the rubber sheet 48 be in the range of 1 mm to 30 mm. By appropriately determining the thickness of the rubber sheet 48, the initial rigidity of the sliding bearing 10 can be adjusted to a desired value.

As described above, the rubber sheet 48 suppresses horizontal vibration transmission from the lower structure 12 to the upper structure 14 of the structure, and makes it possible to adjust the initial rigidity of the sliding bearing 10. In addition, when the horizontality of the first horizontal sliding surface 20 or the horizontality of the second horizontal sliding surface 22 is not good due to a construction error, the second horizontal sliding surface 22 can be slightly inclined. By doing so, the sliding surfaces 20, 2
It also plays the role of preventing the skew of (2). From the viewpoint of preventing the one-side contact, the larger the thickness of the rubber sheet 48 is, the more preferable it is. However, as described above, if the thickness of the rubber sheet 48 is too large, the vertical rigidity becomes too small. Modifications that can preferably solve this problem will be described below with reference to FIG. The sliding bearing 10 ″ shown in FIG. 4 is a modification of the sliding bearing 10 of FIG. 1, and only the changed portions are shown in FIG.
8 is attached to the lower surface of the upper flange plate 36 such that the inner peripheral surface of the ring 50 is in close contact with the outer peripheral surface of the upper half of the rubber sheet 48. The lower edge of the inner peripheral surface of the ring 50 is rounded so that the lower edge does not damage the outer peripheral surface of the rubber sheet 48 when the rubber sheet 48 undergoes horizontal shear deformation.

According to the configuration of FIG. 4, the rubber sheet 48
In a part of the area in the thickness direction (the upper half indicated by tr ₁ in the figure), the horizontal shear deformation is suppressed by the ring 50, while the remaining area in the thickness direction (the part shown in the figure). In the lower half shown by tr ₂ ), horizontal shear deformation is allowed. Therefore, of the thickness of the rubber sheet 48, t
region indicated by r ₁ is not significantly affected by the initial stiffness and vertical rigidity of the sliding bearings 10, a region indicated by tr ₂ primarily affects them. Therefore, if the magnitude of tr ₂ is determined in the same manner as the thickness tr of the rubber sheet 48 in the sliding bearing 10 of FIG. 1, the same suitable seismic isolation performance as that of the sliding bearing 10 of FIG. 1 can be obtained. In addition, the above-described anti-collision function is strengthened because the thickness of the rubber sheet 48 becomes a large sum of tr ₁ and tr ₂ . Instead of using the ring 50, a circular shallow concave portion may be formed on the lower surface of the upper flange plate 36, and the same effect can be obtained. Also, pedestal block 44
The same effect can be obtained even if the ring 50 is mounted in the opposite direction. Further, a shallow concave portion may be formed in the pedestal block 44, and the same effect is obtained.

Next, the second assembly 18 'of the sliding bearing 10' according to the second embodiment shown in FIG. 2 will be described. The sliding bearing 10 according to the first embodiment described above will be described. Portions having the same structure as the second assembly 18 are denoted by the same reference numerals in the drawings, and detailed description is omitted. Second assembly 1 of sliding bearing 10 'shown in FIG.
8 'is an upper flange plate 36 made of a steel plate having a square shape in plan view, and an upright cylindrical pedestal block (pedestal block) 1 having a height smaller than the diameter.
44. The upper flange plate 36
It is fixed to the upper structure 14 in the same manner as the sliding bearing 10 of FIG. The pedestal block 144 is fixed to the lower surface of the upper flange plate 36 and is fixed to the upper structure 14. The lower surface of the pedestal block 144 defines a horizontal plane.

In the second assembly 18 'of the sliding bearing 10' of FIG. 2, as described above with reference to the sliding bearing 10 of FIG.
3mm thick tetrafluoroethylene resin sheet with 300mm diameter
It is formed by cutting out a circle of mm.
On the other hand, the rubber sheet 148 is made of the same material as the rubber sheet 48 used for the sliding bearing 10 of FIG.
mm sheet was cut out in a circular shape, but the diameter of the sheet was
This is 300 mm, the same as 6. The low friction material layer support structure of this second assembly 18 ′ is a thin steel plate 152.
In the illustrated example, the steel plate 152 is formed by cutting a steel plate having a thickness of 3 mm into a circle having a diameter slightly larger than 300 mm. Note that the values of the thickness and the diameter exemplified above are only specific examples, and it goes without saying that the values are variously set in accordance with the actual use conditions. The steel plate 152
One of the side surfaces (upper surface) is connected to the above-mentioned horizontal surface (lower surface) of the pedestal block 144 via a rubber sheet 148, and the other side surface (lower surface) is attached with an ethylene tetrafluoride resin sheet 46. Have been. The connection between the rubber sheet 148 and the steel plate 152 and the rubber sheet 1
The connection between the pedestal block 144 and the pedestal block 144 may be made by an appropriate method such as using a vulcanized adhesive.

According to the above configuration, the sliding bearing 10 shown in FIG.
Similarly, a rubber sheet 148 is interposed between the low friction material layer made of the tetrafluoroethylene resin sheet 46 and the upper structure 14 of the structure. By appropriately setting the thickness of the rubber sheet 148, the same functions and effects as those described with respect to the slide bearing 10 in FIG. 1 can be obtained. In addition, in addition to these, in the sliding bearing 10 ′ of FIG.
6, even if the first horizontal sliding surface 20 has a slight warp or undulation, the thin steel plate 152 supported by the rubber sheet 148.
And since the tetrafluoroethylene resin sheet 46 can be slightly deformed following the warp or undulation, the second tetrafluoroethylene resin sheet 46 defines
The effect is obtained that the surface pressure can be kept substantially uniform over the entire area of the horizontal sliding surface 22. However, in order to obtain this effect, it is necessary that the steel sheet 152 and the ethylene tetrafluoride resin sheet 46 are not too thick, and it is preferable that the thickness of each of them is 4 mm or less. It should be noted that the modification described above with reference to FIG. 4 for increasing the thickness of the rubber sheet 48 of the sliding bearing 10 of FIG. 1 is also applicable to the sliding bearing 10 ′ of FIG. By applying it,
The effect as described above is obtained.

In the various embodiments described above, a first assembly 16 defining a first horizontal sliding surface 22 of a stainless steel surface is coupled to the substructure 12 of the structure and is made of a low friction material. A second assembly 18, 18 'defining a second horizontal sliding surface 22 comprising a surface is coupled to the upper structure 14 of the structure, but upside down to move the first assembly to the upper structure 14. , The second assembly may be coupled to the lower structure 12. Also, the rubber sheet 4
8 and 148, the term rubber in this specification does not mean a material whose chemical composition falls within the category of rubber, but has the same physical properties as rubber. It is intended to mean a material suitable for achieving the described effects. Thus, the term rubber as used herein is intended to encompass a variety of materials having suitable elasticity, strength, and durability, including those that are not rubbers in terms of chemical composition.

[0021]

As is apparent from the above description, according to the seismic isolation sliding bearing of the present invention, when the lower structure of the structure vibrates due to an earthquake or the like, before the tetrafluoroethylene resin sheet starts sliding. Since the vibration transmission from the lower structure to the upper structure is suppressed even when the rubber sheet is sheared in the horizontal direction, the initial rigidity of the seismic isolation sliding bearing is determined by appropriately setting the thickness of this rubber sheet. Can be adjusted in size. Further, even if the horizontality of the first horizontal sliding surface or the horizontality of the second horizontal sliding surface is not good due to a construction error, the rubber sheet is elastically deformed, thereby preventing the sliding surfaces from hitting each other. can do. The ratio of the area of the rubber sheet to the area of the ethylene tetrafluoride resin sheet is set to 2 to 5, and the rubber sheet is prevented from being sheared in the horizontal direction in a part of its thickness direction, The horizontal shear deformation is allowed in the remaining area of the above, so that the performance of the sliding bearing for seismic isolation can be further improved. In addition, these effects can be realized with a seismic isolation sliding bearing at a much lower cost than conventionally used seismic isolation sliding bearings in which laminated rubber is provided in series. Therefore, while having good seismic isolation performance approaching the seismic isolation sliding bearing with laminated rubber attached in series,
It is possible to obtain a seismic isolation bearing that can be manufactured at a much lower cost than that type of seismic isolation bearing and that can keep the height dimension small.

[Brief description of the drawings]

FIG. 1A is a side view of a seismic isolation sliding bearing according to a first embodiment of the present invention installed on a structure, and FIG. 1B is an enlarged cross-sectional side view of a main part thereof.

FIG. 2A is a side view of a seismic isolation sliding bearing according to a second embodiment of the present invention installed on a structure, and FIG. 2B is an enlarged cross-sectional side view of a main part thereof.

FIGS. 3A and 3B are schematic restoring force characteristic diagrams for explaining the operation of the seismic isolation sliding bearing according to the present invention.

FIG. 4 is a sectional side view of a main part for describing a modified form of the seismic isolation sliding bearing of FIG. 1;

[Explanation of symbols]

 10, 10 ', 10 "seismic isolation sliding bearing 12 Lower structure 14 Upper structure 16 First assembly 18, 18' Second assembly 20 First horizontal sliding surface 22 Second horizontal sliding surface 24 Lower flange plate 36 Upper flange plate 44 , 144 pedestal block 46 tetrafluoroethylene resin sheet 48, 148 rubber sheet 152 steel plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidemi Oyama 4-16-15 Sendagaya, Shibuya-ku, Tokyo Fujiuchi Co., Ltd. (72) Inventor Sakae Ueda 541-1 Shimouchi shrine pit, Shimouchi, Mita-shi, Hyogo (56) References JP-A-9-195571 (JP, A) JP-A-63-32036 (JP, A) JP-A-3-157527 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) E04H 9/02 331 E04H 9/02 351 E04B 1/36 E02D 27/34

Claims (2)

(57) [Claims] An upper structure is disposed between an upper structure and a lower structure of a structure to support a weight of the upper structure while allowing a relative horizontal displacement between the upper structure and the lower structure, thereby reducing a weight of the upper structure. A seismic isolation sliding bearing for suppressing transmission of horizontal vibration to an upper structure, comprising: a first assembly coupled to one of an upper structure and a lower structure of a structure to define a smooth first horizontal sliding surface; A second assembly coupled to the other of the upper structure and the lower structure of the structure to define a smooth second horizontal sliding surface, wherein the first horizontal sliding surface and the second horizontal sliding surface slide. By contacting, the first surface is supported while supporting the vertical load on those sliding surfaces.
The second assembly is configured to allow a relative horizontal displacement between the assembly and the second assembly, the second assembly defining a fixed-side support structure fixed to a structure and the second horizontal sliding surface. Tetrafluoride formed
A low friction material layer made of a resin sheet, a low friction material layer support structure defining a horizontal support surface for supporting the low friction material layer, the fixed-side support structure, and the low friction material layer support structure And a horizontally extending rubber sheet connected and interposed between the upper and lower structures of the structure in the horizontal direction from the lower structure to the upper structure by shearing the rubber sheet in the horizontal direction. Vibration transmission is suppressed, the fixed-side support structure is configured with a flange plate fixed to the structure and defining a horizontal plane, the low friction material layer support structure, the upward horizontal plane, A pedestal block having a downward horizontal surface, the pedestal block having one horizontal surface connected to the horizontal surface of the flange plate via the rubber sheet,
Wherein at its other horizontal surface of which supports the resin sheet is a low-friction material layer, in the second assembly, the area ratio of the rubber sheet to an area of the resin sheet Ri 2-5 der, said pedestal block Or the flange plate
Is a shear deformation suppressing portion that is in contact with the outer peripheral surface of the rubber sheet.
The rubber sheet is provided in the shear deformation suppressing portion.
Therefore, horizontal shearing occurs in some areas in the thickness direction.
The shear deformation is suppressed, and in the remaining area in the thickness direction.
A sliding bearing for seismic isolation , wherein horizontal shear deformation is allowed . 2. A method according to claim 1, wherein said rubber sheet has a thickness direction.
The thickness of the area where horizontal shear deformation is allowed is 1m
characterized in that the thickness is in the range from m to 30 mm
The sliding bearing for seismic isolation according to claim 1.