JP6354303B2 - Laminated rubber bearing device - Google Patents

Description

  The present invention supports a structure such as a building such as a building, a bridge or a bridge girder such as a highway, and does not transmit vibration such as an earthquake to the structure, but also attenuates the vibration of the structure early. The present invention relates to a laminated rubber bearing device that is disposed between a structure and a bridge pier or the ground, and can be used for, for example, a seismic isolation device.

  A laminated rubber bearing device with a lead plug, comprising: a laminated body in which reinforcing layers and elastic layers are alternately laminated; and a lead plug disposed in a cylindrical hollow portion penetrating the reinforcing layer and the rubber layer of the laminated body. Is known.

JP-A-8-082012 JP 2001-355676 A

  By the way, when the lead plug is disposed through the reinforcing layer, that is, the rigid layer and the elastic layer, if the thickness of each elastic layer is increased, it is difficult to cause stable shear plastic deformation as designed for the lead plug upon vibration. The vibration energy absorption capacity of the lead plug may be reduced.

  Therefore, for example, in Patent Document 1, an excessive bulge is produced in the cylindrical shape by loading the lead core in the vertical direction between each sandwich plate and a smaller diameter plate than the sandwich plate added between each sandwich plate. A seismic isolation device that holds the lead plug so that it does not occur and Patent Document 2 proposes a laminated rubber bearing device with a lead plug that restrains the lead plug with an intermediate plate arranged between the reinforcing layers.

  However, in such a seismic isolation device and a laminated rubber bearing device with a lead plug (hereinafter referred to as a laminated rubber bearing device), the lead core is temporarily pressed between each sandwich plate and a small diameter plate or the lead plug is restrained by an intermediate plate. By preventing the lead core or the lead plug from bulging, in other words, biting the lead core or the lead plug into the elastic layer, that is, squeezing out, the lead core or the lead plug prevents the vibration energy absorption ability from being lowered. However, it is possible to prevent bulging outward from the reinforcing layer of the elastic layer on the radially outer side of the laminated body, in particular, from the uppermost and lowermost reinforcing layers in the laminated direction, that is, squeezing. Otherwise, it is difficult to obtain high rigidity and load support capability in the laminating direction of the laminated rubber bearing device.

  The present invention has been made in view of the above-mentioned points. The object of the present invention is to prevent a decrease in vibration energy absorption ability due to a cylindrical metal body such as a lead core or a lead plug, It is an object of the present invention to provide a laminated rubber bearing device capable of obtaining high rigidity in the direction and load supporting ability.

  A laminated rubber bearing device according to the present invention includes a laminate formed by alternately laminating rigid layers and elastic layers, an intermediate plate disposed in the elastic layer between at least the uppermost layer and the lowermost rigid layer in the laminating direction, At least one plastically deformable columnar metal body disposed in a cylindrical hollow portion penetrating the rigid layer, the rubber layer, and the intermediate plate, and each intermediate plate is disposed between the inner annular portions of the rigid layer. And the outer annular portion disposed between the outer annular portions of the rigid layer, and on the other hand, on the outer peripheral edge of the inner annular portion surrounding the cylindrical metal body, On the other hand, it has a connecting part connected to the inner peripheral edge of the outer annular part arranged between the outer annular parts of the rigid layer, and this connecting part is provided with a plurality of through holes or recesses. The intermediate plate is sandwiched in the through hole or recess. Elastic body that is integral with the adjacent elastic layer is embedded.

  According to this laminated rubber bearing device, the intermediate plate is arranged in the elastic layer between the uppermost layer and the lowermost rigid layer in the laminating direction, and the inner plate arranged between the inner annular portions of the rigid layer in each intermediate plate. Since the annular portion surrounds the cylindrical metal body, the cylindrical metal body can be prevented from biting into the elastic layer, that is, the cylindrical metal body can be prevented from sticking into the elastic layer. A reduction in vibration energy absorption capability can be prevented, and the outer annular portion is connected to the inner annular portion via the connecting portion. By constraining the outer annular portion disposed between the outer annular portions of the lower rigid layer, the outer annular portion can be prevented from being displaced in the radial direction, and in addition, in the through hole or recess provided in the connecting portion, An elastic layer adjacent to the intermediate plate with the intermediate plate in between Since the elastic body is embedded, the elastic layer disposed between the outer annular portion and the outer annular portion of the uppermost and lowermost rigid layers can be constrained, and the radially outer side of the laminate In this way, it is possible to prevent the elastic layer from bulging outwardly in the radial direction from the uppermost layer and the lowermost rigid layer, and thus to obtain high rigidity and load supporting capability in the stacking direction.

  In a preferable example, the rigid layer and the intermediate plate are made of a steel plate, and the elastic layer and the elastic body are made of rubber. However, the rigid layer and the intermediate plate are not limited to the steel plate, for example, carbon fiber, glass fiber, or aramid fiber. The number of layers of the rigid layer is not particularly limited, and the elastic layer and the elastic rubber are natural rubber and synthetic rubber. At least one of them or at least one of natural rubber and synthetic rubber may be made of a high damping rubber filled with carbon black or a resin-based material. Preferably, the elastic body is made of the same material as the elastic layer. Made of rubber.

  One or a plurality of cylindrical hollow portions may be provided, and the laminate may be a columnar shape, an elliptical column shape, a prismatic shape, particularly a quadrangular prism shape. In a preferred example of the present invention, the cylindrical metal body is , Consisting of at least one of a lead plug containing lead as a main component and a tin plug containing tin as a main component. In the case of a lead plug, lead having a purity of 99.9% or more is also used in the case of a tin plug. Tin having a purity of 99.9% or more is preferably used. However, the present invention is not limited to these, and can be plastically deformed. Moreover, in addition to exhibiting high deformation energy absorption in plastic deformation, the original shape after plastic deformation is used. In returning to, it may be made of a metal or an alloy that can be recrystallized at room temperature.

  In another preferred embodiment of the present invention, each of the plurality of through holes or recesses has an annular outer periphery of the inner annular portion, an annular inner periphery of the outer annular portion, and an annular outer periphery of the inner annular portion. On the other hand, it is defined by a pair of side edges of the intermediate plate respectively connected to the annular inner periphery of the outer annular portion.

  In the present invention, the through hole or the recess is not particularly limited, but in a preferred example, it has a fan shape in plan view.

  The inner annular part of the intermediate plate restrains the cylindrical surface of the columnar metal body to prevent the cylindrical surface of the columnar metal body from protruding outward in the radial direction. It may have an annular inner surface in contact with the surface.

  In the present invention, the uppermost and lowermost rigid layers in the stacking direction are the thicknesses in the stacking direction of the rigid layers between the uppermost and lowermost rigid layers in the stacking direction excluding the uppermost and lowermost rigid layers in the stacking direction. The uppermost and lowermost rigid layers in the stacking direction have one cylindrical recess opened on one side and one cylindrical shape opened on the other side. The cylindrical hollow portion communicates with the concave portion and has a diameter smaller than that of the one cylindrical concave portion, and the cylindrical hollow portion has the highest and lowest rigidity in the stacking direction. It may consist of a rigid layer between the uppermost and lowermost layers in the stacking direction excluding the layer, a through hole defined by the annular inner surface of the rubber layer and the intermediate plate, and the other cylindrical recess. The other cylindrical recess may have the same diameter as that of the through hole, and may be the uppermost in the stacking direction. And the innermost surface of the rigid layer between the uppermost layer and the lowermost rigid layer excluding the lowermost rigid layer, the annular inner surface of the rubber layer and the intermediate plate, and the uppermost and lowermost layers defining the other cylindrical recess. The annular inner surface of the lower rigid layer may be in contact with the cylindrical surface of the columnar metal body.

  The present invention may further have a coating layer for covering the outer peripheral surface of the laminate for preventing corrosion of the rigid layer and the intermediate plate, particularly for preventing rust.

  According to the present invention, a laminated rubber bearing capable of preventing a decrease in vibration energy absorption ability due to a cylindrical metal body such as a lead core or a lead plug, and obtaining high rigidity and load supporting ability in the lamination direction. An apparatus may be provided.

FIG. 1 is an explanatory front sectional view of a preferred example of the present invention. FIG. 2 is a partially enlarged explanatory view of the example shown in FIG. FIG. 3 is an explanatory plan view of the intermediate plate of the example shown in FIG. 4 is a cross-sectional explanatory view taken along line IV-IV of the intermediate plate shown in FIG. FIG. 5 is an explanatory plan view of the steel plate of the example shown in FIG. FIG. 6 is a partial cross-sectional explanatory view of an intermediate plate of another preferred example of the present invention.

  Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  1 to 5, a laminated rubber bearing device 1 of this example is a cylindrical shape in which disk-shaped steel plates 2 as rigid layers and disk-shaped rubber layers 3 made of rubber as elastic layers are alternately laminated. Of the laminated body 4, the disk-shaped intermediate steel plate 5 as an intermediate plate disposed in the rubber layer 3 between the steel plates 2, and the central portions of the steel plate 2, the rubber layer 3, and the intermediate steel plate 5 in the stacking direction V A cylindrical lead plug 7 mainly composed of lead and a cylindrical outer peripheral surface 8 of the laminate 4 are coated as a plastically deformable cylindrical metal body disposed in the penetrating cylindrical hollow portion 6. A cylindrical covering layer 9 and an upper structure such as a building such as a building, a bridge, or a bridge girder such as a highway, which are fixed to the uppermost steel plate 10 in the stacking direction V among the plurality of steel plates 2 by a bolt or the like. 11 is a disk-shaped steel that is similarly fixed to the lower surface 12 of the bolt with bolts or the like. The upper mounting plate 13 and the bottom steel plate 14 in the stacking direction V of the plurality of steel plates 2 are fixed by bolts or the like, and the bolts or the like are also attached to the upper surface 16 of the lower structure 15 such as the foundation on the ground. The lower mounting plate 17 made of a disk-shaped steel plate fixed by the above, the upper shear key 18 disposed between the uppermost steel plate 10 and the upper mounting plate 13, and the lowermost steel plate 14 and the lower mounting plate 17 are disposed. And a lower shear key 19.

  The steel plates 10 and 14 have a thickness T larger than the thickness t in the stacking direction V of the steel plates 25 between the steel plates 10 and 14 excluding the steel plates 10 and 14 of the steel plate 2, and the annular outer peripheral surface 26. Each of the steel plates 10 and 14 having an opening is opened on one surface 27 and is provided with one cylindrical recess 29 defined by the annular inner surface 28 of each of the steel plates 10 and 14, and the other surface. A steel plate having an opening at 30 and communicating with one cylindrical recess 29 and having a diameter r smaller than the diameter R of the one cylindrical recess 29 and the same as the diameter r of the cylindrical hollow portion 6. The other cylindrical recess 32 defined by the annular inner surface 31 of each of 10 and 14 is provided at the center, and the steel plate 25 between the steel plates 10 and 14 is the outer peripheral surface of the steel plates 10 and 14. 26 is the same diameter as that of the outer peripheral surface 26. The surface 33, and an annular inner surface 35 arranged annularly inner surface 31 flush with defining a central through hole 34 having the same radius r as radius r.

  Each of the rubber layers 3 having a thickness t2 in the stacking direction V smaller than the thickness T1 of the steel plates 10 and 14 is larger than the thickness t1 in the stacking direction V of the steel plates 25 between the steel plates 10 and 14. An annular outer peripheral surface 41 arranged flush with 26 and 33 and a central through hole 42 having the same diameter r as the diameter r and a circle arranged flush with the annular inner surfaces 31 and 35 And an annular inner surface 43.

  An annular outer surface 51 having a thickness t3 smaller than a thickness t1 in the stacking direction V of the steel plates 2 between the steel plates 10 and 14, and a central through hole 52 arranged flush with the outer peripheral surfaces 26, 33 and 41. Each of the intermediate steel plates 5 having the annular inner surfaces 31, 35 and 43 and the annular inner surface 53 arranged flush with each other is a steel plate 2 made of the steel plates 10, 14 and 25 in the stacking direction V. Between the inner annular portion 54 and the inner annular portion 56 surrounding the cylindrical surface 55 of the lead plug 7, and the outer annular portion 57 of the steel plate 2 made of the steel plates 10, 14 and 25 in the stacking direction V. The outer annular portion 58 is connected to the outer peripheral edge 59 of the inner annular portion 56 on the one hand, and the connecting portion 61 is connected to the inner peripheral edge 60 of the outer annular portion 58 on the other hand.

  The annular inner surface 53 of the inner annular portion 56 restrains the cylindrical surface 55 of the lead plug 7 and prevents the cylindrical surface 55 of the lead plug 7 from sticking out radially outward H. 7 is in contact with the cylindrical surface 55.

  The connecting portion 61 has a plurality of, ie, eight, through holes 65 that are arranged at equal intervals in the circumferential direction P (equal angular intervals of 45 ° with respect to the central angle) and that each have a fan shape in plan view. The through hole 65 is vulcanized and bonded to the rubber layer 3 adjacent to the intermediate steel plate 5 with the intermediate steel plate 5 interposed therebetween, and is integrated with the rubber layer 3 and the same material as the rubber layer 3. An elastic body 66 made of a rubber is embedded.

  Each of the plurality of through holes 65 includes an annular outer peripheral edge 59 of the inner annular portion 56, an annular inner peripheral edge 60 of the outer annular portion 58, and an annular outer peripheral edge 59 of the inner annular portion 56 on the other hand. And a pair of linear side edges 71 and 72 of the intermediate steel plate 5 connected to the annular inner peripheral edge 60 of the outer annular portion 58, respectively.

  The cylindrical hollow portion 6 is defined by the annular inner surfaces 35, 43 and 53 of the steel plate 25, the rubber layer 3 and the intermediate steel plate 5, and has circular holes 34, 42 and 52 each having the same diameter r, and a circular shape. It is defined by the annular inner surface 31 and has the other cylindrical recess 32 having the same diameter r as that of the through holes 34, 42 and 52, and the annular inner surfaces 31, 35, 43 and 53 are formed. Is in contact with the cylindrical surface 55 of the lead plug 7 having the same diameter r as that of the through holes 34, 42 and 52 and the cylindrical recess 32.

  Cylindrical outer periphery of the laminate 4 composed of the respective outer peripheral surfaces 26 of the steel plates 10 and 14, the respective outer peripheral surfaces 33 of the steel plates 25, the respective outer peripheral surfaces 41 of the rubber layer 3, and the respective annular outer surfaces 51 of the intermediate steel plates 5. The coating layer 9 that covers the surface 8 and has a cylindrical outer peripheral surface 73 is vulcanized and bonded to the outer peripheral surfaces 26, 33, 41 and the annular outer surface 51 to be integrated with the rubber layer 3 and rubber. Each of the rubber layers 3 is vulcanized and bonded to the steel plate 2 and the intermediate steel plate 5 that are in contact with the rubber layer 3 with the rubber layer 3 interposed therebetween in the stacking direction V. Has been.

  The upper mounting plate 13 has a cylindrical recess 75 having the same diameter R as the diameter R of the cylindrical recess 29 at its center, and the lower mounting plate 17 also has a diameter R of the cylindrical recess 29. And the upper shear key 18 is in contact with the upper mounting plate 13 and the steel plate 10 in the cylindrical recesses 29 and 75, and in the stacking direction V. The lower surface 77 of the lead plug 7 is in contact with the upper end surface 78 in the stacking direction V of the lead plug 7 and is disposed in the cylindrical recesses 29 and 75. The lower shear key 19 is attached to the lower side of the cylindrical recesses 29 and 76. In contact with the plate 17 and the steel plate 14, the upper surface 79 in the stacking direction V contacts the lower end surface 80 in the stacking direction V of the lead plug 7, and is disposed in the cylindrical recesses 29 and 75.

  The above laminated rubber bearing device 1 supports the load in the stacking direction V of the upper structure 11 with the stacked body 4, while the vibration of the lower structure 15 with respect to the upper structure 11 due to an earthquake or the like to the outer radial direction H. Permissible by shear deformation of the rubber layer 3 in the radially outward direction H, the transmission of the vibration of the lower structure 15 to the radially outward direction H to the upper structure 11 is suppressed, thereby achieving isolation of the upper structure 11. Then, the energy of the vibration of the upper structure 11 generated in the radial outward direction H based on the vibration of the lower structure 15 in the radial outward direction H is caused by the shear deformation of the laminated body 4 in the radial outward direction H. Absorbing by the shear deformation of the lead plug 7 generated in this manner, the vibration of the upper structure 11 in the radially outward direction H is attenuated at an early stage.

  In the laminated rubber bearing device 1, the intermediate steel plate 5 is arranged in the rubber layer 3 between the steel plates 2, and the inner annular portion 56 arranged between the inner annular portions 54 of the steel plate 2 is provided in each intermediate steel plate 5. Since the lead plug 7 is surrounded, it prevents the lead plug 7 from biting into the rubber layer 3 during load support and shear deformation, that is, preventing the lead plug 7 from penetrating into the rubber layer 3. In addition, the vibration energy absorption capacity of the lead plug 7 can be prevented from being lowered, and the outer annular portion 58 of the intermediate steel plate 5 is connected to the inner annular portion 56 via the connecting portion 61. The outer annular portion 58 disposed between the outer annular portions 57 is restrained so that the outer annular portion 58 is not displaced in the radial direction, that is, one of the radially outward directions H. In addition, the connecting portion In the through hole 65 provided in 61, the intermediate steel plate 5 Since the elastic body 66 integrated with the rubber layer 3 adjacent to the intermediate steel plate 5 is embedded, the rubber layer 3 disposed between the outer annular portions 57 of the steel plate 2 can be constrained to support the load. It is possible to prevent the rubber layer 3 from bulging to the radially outer side H between the steel plates 2 on the radially outer side of the laminated body 4 at the time of shearing deformation, and thus, high rigidity and load supporting ability in the lamination direction V. Can be obtained.

  By the way, in the laminated rubber bearing device 1, the intermediate steel plate 5 includes the through hole 65 in the connecting portion 61, but instead of this, as shown in FIG. There may be provided recesses 83 and 84 having openings in one and the other circular end faces 81 and 82 in the direction V and having a fan shape in plan view. The outer peripheral edge 59, the inner peripheral edge 60, and the side edges 71 and 72, on the one hand, the outer peripheral edge 59, and on the other hand, the bottom surface 86 of one and the other in the stacking direction V of the connecting bottom plate portion 85 connected to the inner peripheral edge 60, respectively. 87, each of the recesses 83 and 84 is vulcanized and bonded to the rubber layer 3 adjacent to the intermediate steel plate 5 with the intermediate steel plate 5 interposed therebetween, and is integrated with the rubber layer 3. And made of the same material as rubber layer 3. The above elastic body 66 and the equivalent of the elastic body is embedded that.

  Also in the intermediate steel plate 5 shown in FIG. 6, since the elastic body 66 is embedded in each of the recesses 83 and 84, the outer annular shape of the steel plate 2 is formed by the elastic body 66 embedded in each of the recesses 83 and 84. The rubber layer 3 disposed between the portions 57 can be constrained to prevent the rubber layer 3 from bulging to the radially outer side H between the steel plates 2 on the radially outer side of the laminate 4 at the time of load support and shear deformation. Therefore, high rigidity and load supporting ability in the stacking direction V can be obtained.

  In the laminated rubber bearing device 1 described above, the intermediate steel plates 5 are laminated in the lamination direction V so that the through holes 65 are completely overlapped in the lamination direction V. Instead, the through holes 65 are partially overlapped. The intermediate steel plate 5 may be laminated in the laminating direction V so that the through holes 65 are not overlapped. Further, when the laminated body has a quadrangular prism shape, the intermediate steel plate 5 is replaced by a disc shape. The intermediate steel plate 5 may be disposed in all the rubber layers 3, but the uppermost steel plate 10 and the steel plate 25 adjacent to the steel plate 10 in the stacking direction V may be used. The intermediate steel plate 5 is disposed only in the rubber layer 3 between the upper steel plates 2 and between the lowest steel plate 2 between the lowest steel plate 14 and the steel plate 25 adjacent to the steel plate 14 in the stacking direction V. In addition, between the uppermost steel plates 2 and Instead of placing the intermediate steel plate 5 between all the steel plates 2 other than between the lower steel plates 2, the intermediate steel plate 5 may be arranged between each of the steel plates 2 such as one or two, and further, the lamination The intermediate steel plates 5 may be arranged so that there is more or less space between the steel plates 2 where the intermediate steel plates 5 are not arranged toward the central portion in the direction V.

DESCRIPTION OF SYMBOLS 1 Laminated rubber support apparatus 2, 10, 14 Steel plate 3 Rubber layer 4 Laminated body 5 Intermediate steel plate 6 Cylindrical hollow part 7 Lead plug 8 Outer peripheral surface 9 Covering layer 11 Upper structure 12 Lower surface 13 Upper mounting plate 15 Lower structure 16 Upper surface 17 Lower mounting plate 18 Upper shear key 19 Lower shear key

Claims (9)

A laminate formed by alternately laminating a rigid layer and an elastic layer, an intermediate plate disposed in the elastic layer between at least the uppermost layer and the lowermost rigid layer in the laminating direction, and a rigid layer, a rubber layer, and an intermediate plate. And at least one plastically deformable columnar metal body disposed in the penetrating cylindrical hollow portion, and each intermediate plate is disposed between the inner annular portions of the rigid layer and the columnar metal An inner annular part surrounding the body, an outer annular part arranged between the outer annular parts of the rigid layer, on the one hand on the outer periphery of the inner annular part surrounding the cylindrical metal body, and on the other hand, the outer annular part of the rigid layer has a respective concatenated connection portion on the inner periphery of the outer annular portion that is disposed between, on the connecting portion, a plurality of which concave plant is provided, concave plants, across the intermediate plate and in elastically layer integrally with the elastic member adjacent to the intermediate plate is embedded Recess, laminated rubber bearing device having a fan-shaped in plan view.   The laminated rubber bearing device according to claim 1, wherein the rigid layer and the intermediate plate are made of a steel plate, and the elastic layer and the elastic body are made of rubber.   3. The laminated rubber bearing device according to claim 1, wherein the cylindrical metal body is made of at least one of a lead plug containing lead as a main component and a tin plug containing tin as a main component. Each of the plurality of concave plants, and the outer peripheral edge of the inner annular portion of the annular, the inner periphery of the outer annular portion of the annular, on the one hand, the outer peripheral edge of the inner annular portion of the annular, on the other hand, the outer annular portion an annular The laminated rubber bearing device according to any one of claims 1 to 3, wherein the laminated rubber bearing device is defined by a pair of side edges of the intermediate plate connected to the inner peripheral edge. The inner annular part of the intermediate plate restrains the cylindrical surface of the columnar metal body to prevent the cylindrical surface of the columnar metal body from protruding outward in the radial direction. The laminated rubber bearing device according to any one of claims 1 to 4, wherein the laminated rubber bearing device has an annular inner surface in contact with the cylindrical surface. The uppermost and lowermost rigid layers in the stacking direction have a thickness larger than the thickness in the stacking direction of the uppermost and lowermost rigid layers in the stacking direction excluding the uppermost and lowermost rigid layers in the stacking direction. The uppermost layer and the lowermost rigid layer in the stacking direction have one cylindrical recess opened on one surface thereof and one cylindrical recess opened on the other surface thereof. And the other cylindrical recess having a diameter smaller than the diameter of one cylindrical recess, and the cylindrical hollow portion has the highest and lowest rigidity in the stacking direction. 6. The method according to claim 1, further comprising: a through hole defined by a rigid layer between the uppermost and lowermost layers in the stacking direction excluding the layer, a rubber layer and an annular inner surface of the intermediate plate, and the other cylindrical recess. The laminated rubber bearing device according to one item. The laminated rubber bearing device according to claim 6, wherein the other cylindrical recess has the same diameter as that of the through hole. Defines the annular inner surface of the rigid layer between the uppermost and lowermost rigid layers in the stacking direction, excluding the uppermost and lowermost rigid layers in the stacking direction, the annular inner surface of the rubber layer and the intermediate plate, and the other cylindrical recess. The laminated rubber bearing device according to claim 6 or 7, wherein the annular inner surfaces of the uppermost and lowermost rigid layers are in contact with the cylindrical surface of the columnar metal body. The laminated rubber bearing device according to any one of claims 1 to 8, further comprising a coating layer that covers an outer peripheral surface of the laminated body.

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