JP2017141942A - Laminate rubber bearing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate rubber bearing body capable of preventing an adhesion portion to plates of upper and lower end parts from being peeled and of reducing concentration of tensile stress or compression stress due to deformation, to obtain a desired durability life by a simple structure.SOLUTION: A laminate rubber bearing body includes: a laminate rubber body in which a plurality of rubber-like elastic plates and a plurality of intermediate hard plates are alternately laminated and connected; and end part hard plates each connected to both upper and lower end surfaces of the laminate rubber body. For the plurality of rubber-like elastic plates, a thickness of an outer peripheral part of at least one rubber-like elastic plate from upper and lower ends of the laminate rubber body toward a center part in a lamination direction is made thicker than a thickness of a body part on a center side with respect to the outer peripheral part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminated rubber bearing used in a seismic isolation structure such as a building or a mechanical device.

  In general, a laminated rubber bearing is known as a seismic isolation device that protects structures such as buildings and bridges, civil engineering structures, and equipment from earthquake vibrations.

  The laminated rubber support has a laminated rubber body in which rubber-like elastic plates and hard plates are alternately laminated, and has high rigidity in the vertical direction and low rigidity in the horizontal direction. Laminated rubber bearings have flange plates on the top and bottom of the laminated rubber body, and the upper and lower flange plates are connected to the upper and lower structures, respectively. The

  Laminated rubber bearings support the upper structure with vertical rigidity and are soft enough in the horizontal direction, that is, a sufficiently small horizontal rigidity to allow relative horizontal displacement between the upper and lower flange plates. Shear deformation at. As a result, the laminated rubber bearing body reduces the seismic force on the structure by transmitting the shaking due to the earthquake with a slow period (hereinafter referred to as a natural period) while supporting the load of the upper structure. That is, the laminated rubber bearing body reduces the seismic force on the structure by flexibly deforming in the horizontal direction during an earthquake while supporting the upper structure. Moreover, in the laminated rubber body of the laminated rubber support body configured as described above, generally, the plurality of rubber-like elastic plates and the metal plate are all formed in the same shape, and the horizontal direction of the rubber-like elastic plate of each layer The spring constant and the deformation capacity are the same.

  Moreover, in the laminated rubber bearing body, it is known that when the upper and lower flange plates are largely displaced in the horizontal direction, a portion where strain concentrates on the laminated rubber body.

  For example, when there is an input of vibration due to an earthquake or the like, the entire laminated rubber support body undergoes a large shear deformation in accordance with this input, and a large horizontal strain of several hundred% acts on the rubber layer. In particular, extremely large stresses such as tension on one side and compression on the other side are concentrated on the outer peripheral portions of the rubber plates that are at both ends of the laminated rubber body and are in contact with the upper and lower flange plates. Thereby, there exists a problem that a rubber-bonding part peels off, causes damage or a fracture | rupture of laminated rubber, and cannot obtain a desired durable life.

  On the other hand, for example, techniques related to laminated rubber bearings as disclosed in Patent Documents 1 to 5 are disclosed.

  In Patent Document 1, in the laminated rubber body, the thickness of the rubber layer at the upper and lower ends is made the smallest so that the rigidity of the rubber plate layer gradually decreases from the upper end and the lower end of the laminated rubber body toward the central portion. A laminated rubber type seismic isolation device is disclosed. In this seismic isolation device, the rubber layer closer to the flange plate in the laminated rubber body has greater rigidity, and the strain concentration is reduced.

  Moreover, in patent document 2, the site | part of the various form in which a shear elastic modulus becomes low is formed by forming the thickness of the upper layer part and lower layer part of a rubber layer thickly compared with the rubber layer of the center part of a lamination direction. By doing so, a rubber laminate is disclosed that reduces local stress.

  Moreover, in patent document 3, a center recessed part is formed in the rubber | gum adhesion surface of a flange steel plate, the edge part of laminated rubber is inserted in the center recessed part, and the adhesion end surface with a flange steel plate is formed long and thick, and stress is applied. A relaxed seismic isolation device is disclosed.

  In Patent Document 4, in a laminated rubber body, a curved surface R whose outer surface is curved in an arc shape in a longitudinal section toward an inner side so that a crossing area gradually increases as it approaches an adhesion end surface with upper and lower flange plates. A base-isolated laminated rubber that is provided to relieve stress is disclosed.

  In Patent Document 5, each rubber layer is composed of a plurality of rubber members separated by concentric circles, and the rubber members adjacent to each other have a low elastic coefficient of the inner rubber member and a higher elastic coefficient of the outer rubber member. Thus, a seismic isolation device has been disclosed in which the stress at the outer peripheral portion is relaxed.

JP-A-11-141180 JP 2006-170394 A JP 2004-278671 A JP 2002-147527 A JP 2010-180959 A

  However, in Patent Document 1, in order to give the rubber plate layer closer to the flange plate in the laminated rubber body to have greater rigidity, in the laminated rubber body, the thickness of the rubber plate layers at the upper and lower ends is made the smallest or a plurality of rubber plates are used. It is necessary to change the material of the layers or to change each rubber plate layer.

  Moreover, in patent document 2, since it is necessary to form the thickness of the upper layer part and lower layer part of a rubber layer thickly compared with the rubber layer of the center part of a lamination direction, a steel plate with a small external shape is formed in the part to form thickly. It takes time and effort to assemble it.

  Moreover, in patent document 3, although the stress concentration of the rubber layer by which an edge part fits into the center recessed part of a flange steel plate can be relieved, the problem that the stress concentration of the rubber layer near the rubber layer cannot fully be relieved. There is.

  Furthermore, in Patent Document 4, in the laminated rubber body, a curved surface R that warps a circular cross section in the longitudinal section toward the inside is provided on the outer surface of the portion that approaches the adhesion end surface with the upper and lower flange plates. Assembly is difficult.

  Further, in Patent Document 5, each rubber layer is formed by a plurality of rubber members separated by concentric circles, and the rubber members adjacent to each other have a low elastic coefficient of the inner rubber member and the elasticity of the outer rubber member. Since the coefficient is high, the structure is complicated and the assembly is expected to be complicated.

  The present invention has been made in view of the above points, and with a simple configuration, the adhesion portion between the upper and lower end portions of the plate is difficult to peel off, and the concentration of tensile stress and compressive stress accompanying deformation is alleviated to achieve desired durability. An object of the present invention is to provide a laminated rubber bearing body capable of obtaining a long life.

One aspect of the laminated rubber bearing of the present invention is:
A laminated rubber body formed by alternately laminating and joining a plurality of rubber-like elastic plates and a plurality of intermediate hard plates;
End hard plates joined to the upper and lower end faces of the laminated rubber body;
Have
The plurality of rubber-like elastic plates are at least one piece extending from the upper end of the laminated rubber body to the central portion in the laminating direction and at least one rubber piece extending from the lower end of the laminated rubber body to the central portion in the laminating direction. A configuration is adopted in which the thickness of the outer peripheral portion of the elastic plate is thicker than the thickness of the main body portion on the center side of the rubber-like elastic plate.

  According to the present invention, it is possible to obtain a desired durable life by reducing the concentration of tensile stress and compressive stress associated with deformation with a simple configuration, in which the adhesive portions of the upper and lower end portions are not easily peeled off.

The longitudinal cross-sectional view which shows typically the structure of the laminated rubber bearing body of one embodiment which concerns on this invention Schematic enlarged cross-sectional view showing the structure of the main part of the outer periphery of the laminated rubber bearing The longitudinal cross-sectional view which shows typically the principal part structure of the modification 1 of the laminated rubber bearing body of one embodiment which concerns on this invention The longitudinal cross-sectional view which shows typically the principal part structure of the modification 2 of the laminated rubber bearing body of one embodiment which concerns on this invention The longitudinal cross-sectional view which shows typically the principal part structure of the modification 3 of the laminated rubber bearing body of one embodiment which concerns on this invention The longitudinal cross-sectional view which shows typically the principal part structure of the modification 4 of the laminated rubber bearing body of one embodiment which concerns on this invention The longitudinal cross-sectional view which shows typically the principal part structure of the modification 5 of the laminated rubber bearing body of one embodiment which concerns on this invention The longitudinal cross-sectional view with which it uses for description of the Example of the laminated rubber bearing body of one embodiment which concerns on this invention

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a longitudinal sectional view schematically showing the configuration of a laminated rubber bearing body 10 according to an embodiment of the present invention.

  A laminated rubber support 10 shown in FIG. 1 includes a laminated rubber body 40 in which a plurality of rubber-like elastic plates 21 to 24 and a plurality of intermediate hard plates 31 and 32 are alternately laminated and joined together. The laminated rubber body 40 has end hard plates 51 and 52 joined to both upper and lower ends. The intermediate hard plates 31 and 32 and the end hard plates 51 and 52 may be metal plates such as ceramics, plastics, fiber reinforced plastics, or non-metal plates in addition to steel plates. The shapes of the intermediate hard plates 31 and 32, the end hard plates 51 and 52, and the rubber-like elastic plates 21 to 24 are not particularly limited, and may be a circle, an ellipse, a rectangle, a polygon such as a pentagon or a hexagon. Also good.

  The end hard plates 51 and 52 are sandwiched from both the upper and lower sides, which are the lamination direction of the laminated rubber body 40, and are joined to the upper and lower end faces of the laminated rubber body 40. In the end hard plates 51 and 52, the side surfaces in the radial direction in the end hard plates 51 and 52, that is, the outer peripheral side end surface (side peripheral surface) are more radial (side) than the outer peripheral surface of the laminated rubber body 40. It is arranged so as to protrude.

  The rubber-like elastic plates 21 to 24 may have a diameter or one side length smaller than the diameter or one side length of the intermediate hard plates 31 and 32.

  The rubber-like elastic plates 21 to 24 are made of a rubber material based on natural rubber (NR) having excellent creep resistance. Various synthetic rubbers other than natural rubber can be used in combination with natural rubber as long as the effects of the present invention are not impaired. Examples of such synthetic rubber include diene rubbers such as isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), and butyl rubber (IIR), and olefins such as ethylene propylene rubber (EPM). System rubbers.

  Natural rubber has excellent creep resistance. From the viewpoint of maintaining this property, when other synthetic rubber is used in combination, at least natural rubber is at least 50% by mass, preferably 75% of the total rubber component. It is preferable that it is blended in an amount of not less than mass%, more preferably not less than 90 mass%. When natural rubber is used alone, it may be used after adjusting the viscosity with a disinfectant.

  The upper and lower surfaces of the rubber-like elastic plate 24 arranged between the intermediate hard plates 31 in the rubber-like elastic plates 21 to 24 are flat surfaces, are arranged horizontally, and are joined to the intermediate hard plate 31. The rubber-like elastic plate whose upper and lower surfaces are flat surfaces is disposed in the central portion of the laminated rubber body 40 in the laminating direction.

  Among the plurality of rubber-like elastic plates 21 to 24 that form the laminated rubber body 40, the rubber-like elastic plates 21 to 23 are at least one or more that extends from the upper end of the laminated rubber body 40 to the central portion in the lamination direction and from the lower end. It is at least one rubber-like elastic plate that extends toward the center in the stacking direction. In the rubber-like elastic plates 21 to 23, the rubber elastic plates 22 and 21 are positioned in this order from the rubber elastic plate 23 closest to the end hard plates 51 and 52 toward the center in the stacking direction.

  In the rubber-like elastic plates 21 to 23, the thickness of the outer peripheral portion 20a is larger than the thickness of the rubber main body portion (main body portion) 20b closer to the center than the outer peripheral portion 20a. Referring to the rubber-like elastic plate 22 in FIG. 1, the thickness of the outer peripheral portion 20a is thicker than the thickness of the rubber main body portion (main body portion) 20b on the center side from the outer peripheral portion 20a. In the present embodiment, the rubber main body portion 20b is an example of a main body portion of a rubber-like elastic plate.

  On the side peripheral surface that is the end surface of the outer peripheral portion of the rubber-like elastic plates 21 to 24, an R-shaped concave portion 25 that is a side-opened and rounded recess is formed in the central portion in the thickness direction. Has been.

  FIG. 2 is a schematic enlarged cross-sectional view showing the configuration of the main part of the outer peripheral portion of the laminated rubber bearing 10 according to one embodiment of the present invention. In FIG. 2, the center axis of the laminated rubber bearing 10 is indicated by CL. Further, in FIG. 2, at least one rubber-like elastic plate extending from the lower end of the laminated rubber body 40 to the central portion in the laminating direction, in the order closest to the end hard plate 52 constituting the lower portion in the laminated rubber support 10. One or more rubber-like elastic plates 21 to 23 are shown. Similarly, at least one rubber-like elastic plate extending from the upper end of the laminated rubber body 40 to the central portion in the laminating direction is positioned in the order closest to the end hard plate 51 constituting the upper portion in the laminated rubber support body 10. One or more rubber-like elastic plates are arranged. Therefore, description of the rubber-like elastic plates 21 to 23 close to the end hard plate 51 is omitted.

  The concave portions 25 of the rubber-like elastic plates 21 to 24 include thicknesses of the respective rubber-like elastic plates 21 to 24, intermediate steel plates 31 and 32 sandwiching the respective rubber-like elastic plates 21 to 24, and end hard plates 51, It is set in the same manner according to the relationship with the position in contact with 52. Therefore, here, the configuration of the recess 25 will be described using reference numerals attached to the positional relationship between the recess 25 of the rubber-like elastic plate 22 in FIG. 2 and the intermediate steel plate 32 sandwiching the recess vertically.

That is, the concave portions 25 of the rubber elastic plates 21 to 24 of the rubber laminate 40 are R <0.5 tR (where tR is rubber elastic elasticity) at the central portions in the thickness direction of the respective rubber elastic plates 21 to 24. It shows a thickness of one plate.) It has a concave bottom portion 25a which is rounded and has a radius of curvature R shown in FIG. In addition, the concave portion 25 has an inclined surface 25b that is in contact with the concave bottom portion 25a of the concave portion 25 between the concave bottom portion 25a and the intermediate hard plates 31 and 32 and the end hard plate 52 sandwiching the respective concave portions 25 from above and below. . Further, the intermediate hard plates 31 and 32 sandwiching the respective concave portions 25 at the upper and lower sides, the horizontal dimension from the side peripheral end portion of the end hard plate 52 is L1, and the inclined surfaces 25b are the respective hard plates 31 sandwiching the concave portion 25 from the upper and lower sides. , 32, 52, the horizontal dimension from the side peripheral end face of each of the hard plates 31, 32, 52 is L2, and the value of L2 / L1 is 0.4 to 0.5. 2 indicates the outer diameter of the intermediate hard plates 31 and 32, and D4 indicates the outer diameter of the linear main body on the center side of the intermediate hard plates 31 and 32.
Further, as in the concave portion 25 of the rubber-like elastic plate 22 shown in FIG. 2, in the concave portion 25 sandwiched by the intermediate hard plate 32 having a tapered portion 322a to be described later, the intermediate hard plate 32 is extended from the concave bottom portion 25a. The length (diameter or side length) of the rubber-like elastic plate 22 is D1, where L is the length of the taper portion up to the position where the tapered portion 322a tapered and the linear main body portion without taper are in contact with each other. In this case, the value of L / D1 is 0.02 to 0.04.

  Thus, since each rubber-like elastic plate 21-24 is provided with the recessed part 25, in the state which the laminated rubber support body 10 supported the structure with high surface pressure, the high shear strain (horizontal direction) by vibrations, such as an earthquake, is carried out. Even if a large deformation is applied, the amount of protrusion (bulging) that protrudes to the outside from between the upper and lower hard plates 31, 32, 51, 52 sandwiching the rubber-like elastic plates 21-24 is reduced. In addition, the thickness of the outer peripheral portion 20a of the rubber-like elastic plates 21-23 extending from the upper and lower ends of the laminated rubber body 40 to the central portion in the lamination direction is thicker than the thickness of the main body portion 20b of each rubber-like elastic plate 21-23. . Thereby, the stress concentration to the adhesion part of the rubber-like elastic plates 21-23 can be reduced.

In the laminated rubber body 40, the number of rubber-like elastic plates including the rubber-like elastic plates 21 to 23 is preferably 10 or more and 45 or less, and more preferably 24 or more and 35 or less. preferable. Here, the laminated rubber body 40 is formed by alternately laminating and joining 26 rubber-like elastic plates (including rubber-like elastic plates 21 to 23) and hard plates arranged between these rubber-like elastic plates. It is formed. The all rubber elastic plate of the laminated rubber body 40 may be the rubber elastic plate 22.
In each of the rubber-like elastic plates 21 to 23, the shape in which the thickness of the outer peripheral portion 20a is thicker than the thickness of the main body portion on the center side corresponds to the shapes of the intermediate hard plates 31 and 32 arranged above and below.

  In the case where the intermediate hard plates 31 and 32 are steel plates, the surface-treated steel plate subjected to surface treatment to prevent rust on the surface thereof, specifically, zinc-plated steel plate plated with zinc, tin plated tin It may be a plated steel plate (tinplate), tin-free steel (tin-free steel plate) treated with chromic acid, or the like. The intermediate hard plates 31 and 32 and the rubber-like elastic plates 21 to 23 are joined by vulcanization adhesion.

  As shown in FIG. 2, the intermediate rigid plate 31 is horizontally arranged, and the upper and lower surfaces thereof are flat surfaces. The intermediate hard plate 31 is disposed in the central portion of the laminated rubber body 40 in the laminating direction.

  The intermediate hard plates 31 and 32 are joined at the outer peripheral portion 322 to the outer peripheral portion 20a whose thickness is increased in the rubber-like elastic plates 21 to 23. The intermediate hard plates 31 and 32 are joined to the rubber main body portion 20b of the rubber-like elastic plates 21 to 23 by the hard plate main body portion 324.

  The intermediate hard plate 32 is disposed near the end hard plates 51 and 52. Here, the intermediate hard plate 32 forms first and second hard layers from the end hard plates 51 and 52 side. The intermediate hard plate 32 forming the first hard layer is disposed above and below the first-stage rubber-like elastic plate 23 from the end hard plates 51 and 52 side together with the end hard plate 52.

  Further, the intermediate hard plate 32 forming the second intermediate hard layer from the end hard plates 51 and 52 side, together with the first intermediate hard plate 32, is the second rubber from the end hard plates 51 and 52 side. The rubber-like elastic plates 22 forming the layers are joined on the upper and lower sides.

  In the intermediate hard plate 32, the surface joined to the rubber-like elastic plates 21 to 23 is the surface on the outer peripheral portion 322 that is joined to the rubber-like elastic plates 21 to 23 from the horizontal surface of the hard plate main body 324. Also, it is inclined in a tapered shape so as to be thin. As described above, the thickness of the outer peripheral portion 322 of the intermediate hard plate 32 is thinner than the thickness of the hard plate main body portion 324 on the center side of the outer peripheral portion 322.

  Here, on the upper and lower surfaces of the intermediate hard plate 32, both the upper and lower surfaces of the outer peripheral portion 322 gradually approach from the center side toward the outer edge side with respect to the horizontal upper and lower surfaces of the hard plate main body portion 324 on the center side. Thus, a taper (taper surface) is provided, and a tapered portion 322a is formed. A thin linear portion 322b having a thickness thinner than that of the hard plate main body portion 324 and a flat surface perpendicular to the stacking direction is connected to the outer edge portion connected at the tip of the tapered portion 322a by the tapered portion 322a.

  The portions of the rubber-like elastic plates 21 to 23 that are joined to the taper portion 322a and the thin linear portion 322b in the vertical direction are the outer peripheral portions 20a of the rubber-like elastic plates 21 to 23. Further, in the intermediate hard plate 32, the portions of the rubber-like elastic plates 21 to 23 joined to the hard plate main-body portion 324 on the center side from the outer peripheral portion 322 are the main-body portions 20 b of the rubber-like elastic plates 21 to 23.

  That is, in the rubber-like elastic plates 21 to 23, the outer peripheral portion 20a is thicker than the main body portion 20b when the intermediate hard plate 32 having the tapered portion 322a and the thin linear portion 322b is disposed on at least one of the upper and lower sides. Thus, the outer peripheral part 20a of the rubber-like elastic plates 21 to 23 is formed so as to gradually increase in a taper shape from the rubber main body part 20b side toward the outer peripheral side. The thickness of the outer peripheral portion 20a of the rubber-like elastic plates 21 to 23 is larger than the thickness of the main body portion 20b of the rubber-like elastic plates 21 to 23, and is twice the thickness of the main body portion 20b. If the thickness of the outer peripheral portion 20a is not more than twice the thickness of the main body portion 20b, it can be easily manufactured by processing a conventional mold for manufacturing a flat elastic rubber plate or intermediate rigid plate. On the other hand, when the thickness of the outer peripheral portion 20a is larger than twice the thickness of the main body portion 20b, it is necessary to process the mold itself greatly in manufacturing, which requires time and effort and increases the cost.

  In the intermediate hard plate 32, it is preferable that a portion where the outer peripheral portion 322 (in this case, the tapered portion 322a) and the hard plate main body portion 324 are continuous on the upper and lower surfaces is a curved surface. The intermediate rigid plate 32 and the rubber-like elastic plates 21 to 23 joined to the intermediate hard plate 32 are formed so as to have outer surfaces without corners, and can be more suitably deformed.

  In the laminated rubber bearing 10, the rubber-like elastic plates 21 to 23 disposed near the end hard plates 51 and 52 have a thickness of the outer peripheral portion 20a rather than the thickness of the main body portion (corresponding to the central portion) 20b on the center side. Is thick. Thereby, the stress of the outer peripheral part of the upper-lower-end part of the laminated rubber bearing body 10 where the stress at the time of a deformation | transformation concentrates at the time of an earthquake can be relieved.

  As described above, according to the present embodiment, the outer circumferences of the rubber-like elastic plates 21 to 23 that are alternately laminated using the intermediate hard plate 32 having the thin outer peripheral portion 322 in the upper and lower layers of the laminated rubber support 10. The part 20a is thickened. This makes it possible to minimize the decrease in vertical rigidity and horizontal rigidity even when compared with the conventional structure in which the intermediate hard plate 31 and the rubber-like elastic plate alternately laminated with the upper and lower surfaces being flat. The vertical rigidity and horizontal rigidity of the support body are substantially the same. That is, the laminated rubber bearing body 10 locally maintains the load bearing capacity and the natural period (for example, 4 seconds) as in the conventional structure, and locally the tensile stress in the laminated rubber body 40 and thus the laminated rubber bearing body 10. It is possible to relieve the concentration or compressive stress of (the stress in the pulling direction in the vertical direction) and improve the deformation capacity. Thereby, a desired durable life can be obtained.

  Further, according to the present embodiment, the rubber-like elastic plates 21 to 21 are formed by molding the rubber-like elastic plate constituting the laminated body 40 of the laminated rubber support 10 with the mold and easily laminated on the intermediate hard plate 32. 23 can be made thicker than the thickness of the main body 20b. That is, unlike Patent Document 1, in the laminated rubber body 40, it is necessary to make the thickness of the rubber plate layers at the upper and lower ends the smallest, to make the materials of the plurality of rubber plate layers different, or to change each rubber plate layer. And can be assembled easily. Further, unlike Patent Document 2, it is not necessary to form the upper layer portion and lower layer portion of the rubber layer thicker than the rubber layer at the center in the stacking direction, or to separately prepare a steel plate having a small outer shape. Further, unlike Patent Document 3, there is no need to process the flange plate provided on the upper and lower structures to which the end hard plates 51 and 52 are fixed. Further, unlike Patent Document 4, in the laminated rubber body, it is not necessary to process the outer surface of the portion approaching the bonding end face with the upper and lower flange plates into a complicated shape, and the upper and lower sides of the laminated rubber body 40 with a simple configuration. The adhesion part with the end hard plates 51 and 52 to be joined is hardly peeled off, and the concentration of tensile stress and compressive stress accompanying deformation can be reduced.

<Modification 1>
FIG. 3 is a vertical cross-sectional view schematically showing a main part configuration of Modification 1 of the laminated rubber bearing body 10 according to the embodiment of the present invention. In addition, in the laminated rubber bearing bodies 10A to 10E of the following modifications, the basic configuration is the same as that of the laminated rubber bearing body 10, and thus the same components as those of the laminated rubber bearing body 10 are denoted by the same reference numerals. A name is attached and description is abbreviate | omitted.

3A is a single side of the outer peripheral portion 322A of one or more intermediate hard plates 32A closest to the upper end hard plate 51 (two in FIG. 3) in the configuration of the laminated rubber support 10. Only a tapered surface (tapered portion) 3221 is provided. Correspondingly, in the laminated rubber bearing body 10A, the thickness of the outer peripheral portion 26a of the rubber-like elastic plate 26 laminated on the outer peripheral portion 322A having the tapered surface 3221 of the intermediate hard plate 32A is the same as that of the rubber-like elastic plate 26. It is thicker than the thickness of the main body portion 26b including the central portion. Further, the thickness of the outer peripheral portion of one or more rubber-like elastic plates extending from the lower end of the laminated rubber body 40A (or the lower end hard plate 52 shown in FIG. 1) to the central portion in the lamination direction is also the rubber-like elasticity. It is formed thicker than the thickness of the main body on the center side of the plate.
Therefore, compared to a structure using an intermediate hard plate whose upper and lower surfaces are flat, the vertical rigidity and horizontal rigidity are substantially the same, and the laminated rubber bearing body is locally maintained while maintaining the load bearing capacity and natural period. Tensile stress concentration in 10A or improvement in deformation capability against compressive stress can be achieved.

<Modification 2>
FIG. 4 is a longitudinal cross-sectional view schematically showing the configuration of the main part of Modification 2 of the laminated rubber bearing body 10 according to one embodiment of the present invention.

  The laminated rubber bearing body 10B of FIG. 4 is an intermediate rigid board as an intermediate rigid board closest to the end hard board (end hard board 51 in FIG. 4) among the plurality of intermediate hard boards in the configuration of the laminated rubber bearing body 10. This is a structure in which one intermediate rigid plate 32B having the same configuration as the plate 32 is arranged. Thereby, the thickness of the outer peripheral portion 27a of the rubber-like elastic plate 27 joined to the intermediate hard plate 32B in the upper and lower directions is larger than the thickness of the main body portion 27b on the center side of the rubber-like elastic plate 27. In the laminated rubber support 10B, at least one piece (here, two pieces) extending from the lower end of the laminated rubber body 40B (may be the lower end hard plate 52 shown in FIG. 1) to the central portion in the lamination direction. Similarly, the thickness of the outer peripheral portion of the rubber-like elastic plate is formed thicker than the thickness of the main body portion on the center side of the rubber-like elastic plate. Thereby, the effect similar to the modification 1 can be acquired.

<Modification 3>
FIG. 5 is a longitudinal cross-sectional view schematically showing the configuration of the main part of Modification 3 of the laminated rubber bearing body 10 according to one embodiment of the present invention.

  The laminated rubber bearing body 10C in FIG. 5 is a laminate of rubber-like elastic plates whose outer peripheral thickness is thicker than the thickness of the central portion (main body portion) among the plurality of intermediate hard plates in the configuration of the laminated rubber bearing body 10. At least one end hard plate, here, the end hard plate 53 fixed to the upper surface of the laminated rubber body 40C is tapered, similarly to the taper surface of the taper portion 322a of the outer peripheral portion 322 of the intermediate hard plate 32C. 5331 (corresponding to a tapered portion) is provided. Thereby, the thickness of the outer peripheral portion 28a of the rubber-like elastic plate 28 disposed between the surface of the end hard plate 53 on the tapered surface 5331 side and the intermediate hard plate 32C is set to the central portion 28b of the rubber-like elastic plate 28. It is thicker than the thickness. It should be noted that the laminated rubber support 10C includes at least one piece (here, three pieces) extending from the lower end of the laminated rubber body 40C (or the lower end hard plate 52 shown in FIG. 1) to the central portion in the lamination direction. Similarly, the thickness of the outer peripheral portion of the rubber-like elastic plate is formed thicker than the thickness of the main body portion on the center side of the rubber-like elastic plate. Thereby, the effect similar to the modification 1 can be acquired.

<Modification 4>
FIG. 6 is a vertical cross-sectional view schematically showing a main part configuration of Modification 4 of the laminated rubber bearing body according to the embodiment of the present invention.

  The laminated rubber bearing body 10D of FIG. 6 is an intermediate rigid board 32D in which the corners of the intermediate rigid board 32 are all R-shaped and the entire outer surface is curved in place of the intermediate rigid board 32 in the configuration of the laminated rubber bearing 10. It is configured using. Thereby, the outer surface of the rubber-like elastic plate 24D is also formed in a curved surface according to the shape of the intermediate hard plate 32D, and the thickness of the outer peripheral portion 29a of the rubber-like elastic plate 29 laminated on the intermediate hard plate 32D is It is thicker than the thickness of the main body 29b including the central portion of the rubber-like elastic plate 29. It should be noted that the laminated rubber bearing body 10D has at least one piece (here, two pieces) extending from the lower end of the laminated rubber body 40D (the lower end hard plate 52 shown in FIG. 1) to the central portion in the lamination direction. Similarly, the thickness of the outer peripheral portion of the rubber-like elastic plate is formed thicker than the thickness of the main body portion on the center side of the rubber-like elastic plate. Thereby, the effect similar to the modification 1 can be acquired. Further, since the outer surface of the intermediate hard plate 32D is a curved surface, the stress applied to the laminated rubber bearing body 10A can be further reduced as compared with a cornered structure. Depending on the shape of the intermediate rigid plate 32D, the outer surface of the rubber-like elastic plate 24D is also formed into a curved surface, and the same effects can be obtained.

<Modification 5>
FIG. 7 is a longitudinal cross-sectional view schematically showing a main part configuration of Modification 5 of the laminated rubber bearing body according to the embodiment of the present invention.

  Unlike the configuration of the rubber-like elastic plates 21 to 23 of the laminated rubber support 10, the rubber-like elastic plates 21 </ b> A to 23 </ b> A have R-shaped recesses 25 that open to the side. It is not configured. In addition, the laminated rubber support 10E includes at least one piece (here, three pieces) extending from the lower end of the laminated rubber body 40E (or the lower end hard plate 52 shown in FIG. 1) to the central portion in the lamination direction. Similarly, the thickness of the outer peripheral portion of the rubber-like elastic plate is formed thicker than the thickness of the main body portion on the center side of the rubber-like elastic plate. Thereby, the effect similar to the modification 1 can be acquired.

  In addition, the taper processing in the end hard plate 53 and the intermediate hard plates 32, 32A, 32B, 32C, and 32D in each of the first to fifth modifications can be easily performed by grinding or the like.

  In the laminated rubber support according to the present invention, the plurality of rubber-like elastic plates are at least one piece from the upper end of the laminated rubber body to the central portion in the laminating direction and from the lower end of the laminated rubber body to the central portion in the laminating direction. If the thickness of the outer peripheral portion of at least one rubber-like elastic plate is thicker than the thickness of the main body portion on the center side of the rubber-like elastic plate, It may be formed as follows. For example, in the configuration of the intermediate rigid plate 32, the outer peripheral portion 322 may be tapered to the outer edge, and the thin straight portion may be eliminated. Even in this configuration, the outer peripheral portion of the rubber-like elastic plate joined to the intermediate rigid plate can be thicker than the center side of the outer periphery, and the same effect as described above can be achieved.

  FIG. 8 is a longitudinal sectional view for explaining an example of the laminated rubber bearing of one embodiment according to the present invention. In FIG. 8, the intermediate part of the laminated rubber bearing is omitted.

  As shown in FIG. 8, 26 circular rubber plates (rubber elastic plates) having a diameter D1 of 800 mm and a thickness tR of 6 mm, and a circular steel plate having a diameter D4 of 820 mm and a thickness of 4.5 mm ( Two intermediate hard plates 31, 32) are alternately stacked, and two connected steel plates (end hard plates 51, 52) having a diameter of 870 mm and a thickness of 22 mm are placed on the rubber-like elastic plate 23 closest to the upper and lower surfaces. Each was laminated and vulcanized to form a laminated rubber bearing 10F. Moreover, the intermediate | middle rigid board 32 formed so that the thickness of the outer peripheral part might be thin from 4.5 mm of the main body part of the center side to 2.0 mm was used. In the intermediate hard plate 32, a taper is provided in a portion of Φ760 to φ800, and the thickness is reduced from the center portion to the outer peripheral portion. Moreover, in the intermediate | middle rigid board 32, the thin linear part was provided in the part to the outer peripheral side from (PHI) 800 and to (PHI) 820 of an outer side surface.

  The load bearing capacity is set by vertical strain and surface pressure. In the present embodiment, the vertical rigidity and the pressure receiving areas of the rubber-like elastic plate and the intermediate hard plate are the same. The natural period in the laminated rubber bearing is 4 seconds. A conventional structure having a laminated rubber support 10F and a laminated rubber body in which intermediate rigid plates 31 and double-sided flat rubber-like elastic plates are alternately laminated without using the intermediate rigid plate 32 and the rubber-like elastic plates 21 and 23. The laminated rubber bearings were compared by performing a compression shear test.

  The laminated rubber bearing body of the conventional structure broke at a shear strain of 470% to 480%, but the laminated rubber bearing body 10F did not break at the same shear strain.

  In the laminated rubber bodies 40, 40A, 40B, 40C, 40D, and 40E, the intermediate hard plates 31, 32, 32A, 32B, 32C, and 32D and the rubber elastic plates 21, 21A, 22, 22A, 23, 23A, and 24 are used. , 24D, 26, 27, 28, 29, the outer peripheral surface formed by the outer peripheral portions may be covered with a protective rubber layer.

  The embodiment of the present invention has been described above. The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. That is, the description of the configuration of the apparatus and the shape of each part is an example, and it is obvious that various modifications and additions to these examples are possible within the scope of the present invention.

  The laminated rubber bearing according to the present invention has a simple configuration, and the adhesive portions with the upper and lower end plates are difficult to peel off, and the concentration of tensile stress and compressive stress accompanying deformation is alleviated to obtain a desired durable life. It is effective as a seismic isolation device.

10, 10A, 10B, 10C, 10D, 10E, 10F Laminated rubber bearing body 20a, 26a, 27a, 28a, 29a, 322, 322A Outer peripheral part 20b, 26b, 27b, 28b, 29b Main body part 21, 21A, 22, 22A , 23, 23A, 24, 24D, 26, 27, 28, 29 Rubber elastic plate 25 Recessed portion 25a Bottom portion 25b Inclined surface 31, 32, 32A, 32B, 32C, 32D Intermediate rigid plate 40, 40A, 40B, 40C, 40D , 40E Laminated rubber body 51, 52, 53 End hard plate 322a Tapered portion 3221, 5331 Tapered surface 324 Hard plate main body

Claims (5)

A laminated rubber body formed by alternately laminating and joining a plurality of rubber-like elastic plates and a plurality of intermediate hard plates;
End hard plates joined to the upper and lower end faces of the laminated rubber body;
Have
The plurality of rubber-like elastic plates are at least one piece extending from the upper end of the laminated rubber body to the central portion in the laminating direction and at least one rubber piece extending from the lower end of the laminated rubber body to the central portion in the laminating direction. The thickness of the outer peripheral portion of the elastic plate is thicker than the thickness of the main body portion on the center side of the rubber-like elastic plate,
Laminated rubber bearings characterized by that. The outer peripheral part of the rubber-like elastic plate is formed so as to gradually increase in thickness from the main body part side toward the outer peripheral side,
The laminated rubber bearing body according to claim 1. When the length of the rubber-like elastic plate is D1, and the length of the tapered portion is L, the ratio L / D1 between L and D1 is 0.02 to 0.04.
The laminated rubber bearing body according to claim 2, wherein: The thickness of the outer peripheral portion of the rubber-like elastic plate is less than twice the thickness of the main body portion of the rubber-like elastic plate.
The laminated rubber bearing body according to any one of claims 1 to 3. A side peripheral surface of the rubber-like elastic plate is characterized by being rounded and recessed inward in the central portion in the thickness direction,
The laminated rubber bearing body according to any one of claims 1 to 4.

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