JP6064670B2 - Rubber bearing - Google Patents

Description

  The present invention relates to a rubber bearing that is capable of moving an upper structure such as a bridge girder in a horizontal direction and elastically supporting it in a vertical direction with respect to a lower structure such as a bridge pier in a structure such as a bridge.

  In a bridge, for example, a rubber bearing that can move a bridge girder in a horizontal direction with respect to a bridge pier and elastically supports it in a vertical direction is arranged between the bridge pier and the bridge girder. Is attached to the bridge pier and has a recess with a recess, a rubber elastic body fitted into the recess of the lower fence, and a rubber elastic body superimposed on the rubber elastic body and partially fitted into the recess of the lower fence. An intermediate plate mounted horizontally on the upper gutter attached to the bridge girder, and in some cases, a slide plate attached to the intermediate girder horizontally on the upper girder attached to the bridge girder The bridge girder can be moved in the horizontal direction with respect to the pier, and can be elastically supported in the vertical direction.

Japanese Utility Model Publication No. 56-3367 JP 2000-178922 A

  By the way, the rubber elastic body adapted to elastically support the load of the pier in such a rubber bearing has a biased deformation between the lower arm and the intermediate plate due to the load to be supported, particularly the repeatedly fluctuating load. Although it is difficult to achieve the original function over a long period of use, it protrudes from the gap, but for such a problem, Patent Document 1 discloses an annular stepped portion on the outer peripheral edge of the upper surface of the rubber elastic body on which the intermediate plate is overlaid. A plastic material protective ring made of ethylene tetrafluoride resin, polyethylene resin and polyamide resin and a compression ring made of metal such as bronze, brass or stainless steel are laminated and fitted on the annular step portion. The rubber bearing is described.

  However, in the rubber bearing described in Patent Document 1, since the compression ring superimposed on the protective ring is made of metal, the vertical load at the outer edge of the intermediate plate in the rotation (swing) of the bridge girder with respect to the bridge pier Is greatly added to the protective ring and the rubber elastic body through the compression ring, and as a result, the rubber elastic body is greatly elastically deformed. In the case of a relatively non-stretchable metal compression ring, it is difficult to expect a sealing function for the gap between the lower plate and the intermediate plate, which causes excessive bias deformation between the lower plate and the intermediate plate. As a result of the loss of the outer peripheral portion of the rubber elastic body due to protruding from the gap between them, the elastic support function of the rubber elastic body is lowered by the disappearance of the outer peripheral portion, and the original function of the rubber bearing is prolonged It is exhibited not.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to more reliably seal the gap between the lower arm and the intermediate plate, and thus It is an object of the present invention to provide a rubber bearing that can reduce the protruding deformation of the rubber elastic body from the gap between them, can avoid the disappearance of the rubber elastic body, and can maintain its original function over a long period of time.

  The rubber bearing according to the present invention is a disc-shaped rubber having a lower collar having a circular recess on the upper surface, and an annular notch on the outer edge of the circular upper surface while being fitted in the recess of the lower collar. An elastic body, a compression ring arranged in a notch of the rubber elastic body and fitted in a recess of the lower collar, and the rubber elastic body and the compression ring stacked above the rubber elastic body and the compression ring. And an intermediate plate partially disposed in the recess of the lower collar and projecting out of the recess of the lower collar in the vertical direction, and the compression rings are concentric with each other on the inner peripheral side and the outer periphery At least one pair of compression ring pieces arranged on the side, and the compression ring piece on the inner peripheral side is a cylindrical inner peripheral surface that is in contact with a cylindrical vertical surface of a rubber elastic body that defines a notch An annular upper surface that contacts the annular lower surface of the intermediate plate, and a gob that defines the notch An annular lower surface that is in contact with the annular horizontal surface of the elastic body, and an annular inclined outer peripheral surface that is inclined with respect to the lower surface so that the diameter gradually changes from the lower surface toward the upper surface. The outer peripheral compression ring piece includes a cylindrical outer peripheral surface facing a cylindrical inner peripheral surface in the radial direction of the lower collar defining the recess, and an annular horizontal surface of a rubber elastic body defining the notch An annular lower surface that is in contact with the intermediate plate, an annular upper surface that is in contact with the annular lower surface of the intermediate plate, and an inner circumferential side of the upper surface so that the diameter gradually changes from the upper surface toward the lower surface. And an annular inclined inner peripheral surface which is inclined in a complementary manner with the inclined outer peripheral surface of the compression ring piece and slidably contacts the inclined outer peripheral surface of the compression ring piece on the inner peripheral side.

  According to such a rubber bearing, the compression ring includes at least a pair of compression ring pieces that are concentric with each other and are arranged on the inner peripheral side and the outer peripheral side, and the inner peripheral side compression ring piece has an inclined outer peripheral surface. The outer peripheral compression ring piece has an annular inclined inner peripheral surface slidably in contact with the inclined outer peripheral surface of the inner peripheral compression ring piece. The compression ring is compressed by applying a vertical load at the outer edge of the intermediate plate in the rotation (oscillation) of the upper structure such as a bridge girder with respect to the structure. As a result, the gap between the lower heel and the intermediate plate can be reliably sealed, and as a result, the gap between the lower heel and the intermediate plate can be reliably sealed. The protruding elastic deformation of the rubber elastic body from the gap between the lower arm and the intermediate plate It made reducing, avoiding the loss of the rubber elastic body, can maintain the original functions for a long time.

  In the rubber bearing of the present invention, the compression ring disposed in the notch of the rubber elastic body and fitted in the recess of the lower collar may be one piece or a plurality of layers stacked in the vertical direction. When the compression ring is arranged in the notch of the rubber elastic body and is fitted in the recess of the lower collar, in the rubber bearing of the present invention, at least one compression ring is at least a pair of compression ring pieces as described above. As long as it has.

  In a preferable example of the rubber bearing of the present invention, the inclined outer peripheral surface is inclined at an angle of 30 ° to 60 ° with respect to the lower surface of the inner peripheral compression ring piece, and the inclined inner peripheral surface is compressed on the outer peripheral side. It is inclined at an angle of 30 ° to 60 ° with respect to the upper surface of the ring piece.

  The inclination angle of the inclined outer peripheral surface and the inclined inner peripheral surface is 45 ° in order to ensure the interaction of force transmission in the compression between the inner compression ring piece and the outer compression ring piece. It is most preferable that when the angle is other than 30 ° to 60 °, there is a possibility that such an interaction may not be obtained. Therefore, the angle is preferably 30 ° to 60 °.

  In the rubber bearing of the present invention, the inclined outer peripheral surface gradually decreases in diameter from the lower surface of the inner peripheral side compression ring piece toward the upper surface of the inner peripheral side compression ring piece, and the inclined inner peripheral surface Each may be inclined so as to gradually increase in diameter from the upper surface of the outer peripheral side compression ring piece to the lower surface of the outer peripheral side compression ring piece. The inclined inner peripheral surface is the upper surface of the outer peripheral compression ring piece so that the diameter gradually increases from the lower surface of the inner peripheral compression ring piece to the upper surface of the inner peripheral compression ring piece. However, in the preferred example, the inclined outer peripheral surface and the inclined inner peripheral surface are inclined as in the former. doing.

  In a preferred example of the rubber bearing of the present invention, the cylindrical inner peripheral surface of the compression ring piece on the inner peripheral side is bonded and fixed to the cylindrical vertical surface of the rubber elastic body that defines the notch, The annular lower surface of the circumferential compression ring piece is adhesively fixed to the annular horizontal surface of the rubber elastic body that defines the notch, and the annular lower surface of the outer compression ring piece is notched. The compression ring piece on the inner peripheral side is adhesively fixed to the cylindrical vertical surface of the rubber elastic body that defines the notch on the inner peripheral surface thereof. The inner ring side compression ring piece can follow the elastic deformation of the rubber elastic body, and the inner ring side and outer ring side compression ring pieces define notches on their annular lower surfaces. If it is bonded and fixed to the annular horizontal surface of the body, the rubber elastic body is restrained and biased To be able to suppress the elastic deformation of the rubber elastic body with a shape, it can be reduced polarization pressure change solid content of the rubber elastic body.

  In the present invention, each of the compression ring pieces on the inner peripheral side and the outer peripheral side may be made of a metal such as a phosphor bronze alloy, but is preferably a hard synthetic resin having flexibility than the phosphor bronze alloy or the like. In the case of such a synthetic resin, in a particularly preferable example, it is made of nylon-66 having more flexibility than metal and having a certain rigidity, and the compression ring piece is made of such nylon- If it is made of 66, the vertical load at the outer edge of the upper surface of the rubber elastic body in the addition of the vertical load at the outer edge of the intermediate plate in the rotation (swing) of the upper structure such as the bridge girder with respect to the lower structure such as the pier As a result of being able to reduce the load applied, it is possible to reduce the amount of bias deformation of the rubber elastic body, and the compression ring pieces on the inner peripheral side and outer peripheral side define notches on the annular lower surface of the rubber elastic body. Bonded and fixed to an annular horizontal surface When the compression ring piece is bonded and fixed to the cylindrical vertical surface of the rubber elastic body that defines the notch at the cylindrical inner peripheral surface, the elastic deformation of the rubber elastic body can be constrained. In addition, the pressure deformation of the rubber elastic body can be reduced, and in addition, the gap between the lower arm and the intermediate plate can be closed with a stretchable outer peripheral compression ring piece. It is possible to reduce the protrusion of the partial pressure deformation from the gap between the plates, avoid the disappearance of the rubber elastic body, and maintain the original function for a long period.

  The inner and outer compression ring pieces need not be formed of the same material, and one of the inner and outer compression ring pieces is made of a metal such as phosphor bronze alloy. The other of the compression ring pieces on the inner peripheral side and the outer peripheral side may be made of a synthetic resin such as nylon-66. In a preferred example, both the compression ring pieces on the inner peripheral side and the outer peripheral side are synthesized. Made of resin, particularly preferably nylon-66.

  In a preferred example of the rubber bearing of the present invention, the cylindrical outer peripheral surface of the outer peripheral compression ring piece is slidably contacted in the vertical direction with the radially inner cylindrical inner peripheral surface defining the recess. doing.

  According to the rubber bearing of such an example, in the addition of the vertical load at the outer edge of the intermediate plate in the rotation of the upper structure such as the bridge girder with respect to the lower structure such as the pier, the cylindrical shape of the compression ring piece on the outer peripheral side is added. As a result of being able to slidably contact the outer peripheral surface with the cylindrical inner peripheral surface in the radial direction that defines the recess of the lower flange, the gap between the lower flange and the intermediate plate can be more reliably sealed. Further, it is possible to further reduce the protrusion of the elastic deformation of the rubber elastic body from the gap between the lower rod and the intermediate plate in the rotation of the upper structure such as the bridge girder with respect to the lower structure such as the bridge pier.

  In the rubber bearing of the present invention, the intermediate plate may be made of a rigid metal such as S45CN, and the intermediate plate has a cylindrical inner shape that defines a recess of the lower collar at the lower portion of the cylindrical outer peripheral surface. A cylindrical body partially disposed in the recess of the lower arm with a cylindrical gap with respect to the peripheral surface and in contact with the circular upper surface of the rubber elastic body and the annular upper surface of the compression ring at the circular lower surface However, in a preferred example, the intermediate plate is arranged in the recess of the lower collar with a cylindrical gap with respect to the cylindrical inner peripheral surface defining the recess of the lower collar on the cylindrical outer peripheral surface. A cylindrical base that is in contact with the circular upper surface of the rubber elastic body and the annular upper surface of the compression ring at the lower surface of the circular ring, and the base cylinder formed concentrically and integrally with the base A cylindrical protrusion having a cylindrical outer peripheral surface having a smaller diameter than the outer peripheral surface In another preferred embodiment of the present invention, the rubber support is fitted into the recess on the circular upper surface of the intermediate plate, or in the recess on the upper surface of the projection when the intermediate plate has the projection. The sliding plate may further include a fiber reinforced thermosetting resin as a base material, and a solid lubricant may be embedded in the sliding surface. If the sliding plate is not used, it is not limited to the one using a plate, and if the intermediate plate has a protruding portion, or if the intermediate plate has a protruding portion, the upper surface itself of the protruding portion is solid. A lubricant may be embedded.

  As an example, the rubber bearing of the present invention is used by being disposed between a bridge pier and a bridge girder, but is not limited thereto.

  According to the present invention, the gap between the lower arm and the intermediate plate can be more reliably sealed, and thus the protruding elastic deformation of the rubber elastic body from the gap between the lower arm and the intermediate plate can be prevented. It is possible to provide a rubber bearing that can be reduced, can eliminate the disappearance of the rubber elastic body, and can maintain its original function over a long period of time.

FIG. 1 is a partially broken plan view of a preferred example of an embodiment of the present invention. FIG. 2 is an explanatory cross-sectional view of the example shown in FIG. FIG. 3 is a partially enlarged cross-sectional explanatory view of the example shown in FIG. FIG. 4 is a partially enlarged cross-sectional explanatory view of another preferred example of the embodiment of the present invention.

  1 to 3, the rubber bearing 1 of this example used between the bridge pier D and the upper rod U fixed to the bridge girder includes a lower rod 4 having a circular recess 3 on the upper surface 2. A disc-shaped rubber elastic body 7 fitted in the recess 3 and having an annular notch 6 on the outer edge of the circular upper surface 5, and arranged in the notch 6 and fitted in the recess 3. The compression ring 8, the rubber elastic body 7 and the compression ring 8 are stacked above the rubber elastic body 7 and the compression ring 8 and partially disposed in the recess 3, and the recess 3 is out of the vertical direction V. And an intermediate plate 13 having a circular recess 12 on the upper surface 11, and a disc-shaped sliding plate 14 fitted in the recess 12.

  A rigid metal lower bar 4 such as SM490A having a cylindrical outer peripheral surface 20 is fixed to the upper surface 22 of the bridge pier D by a bolt or the like at the lower surface 21, and the recess 3 It is defined by a cylindrical inner peripheral surface 23 in the radial direction (horizontal direction) H and a bottom surface 24 of the lower collar 4 connected to the inner peripheral surface 23.

  A rubber elastic body 7 made of natural rubber, proloprene synthetic rubber, or the like includes a circular lower surface 31 in contact with the bottom surface 24 in addition to the upper surface 5, and a cylinder in contact with the inner peripheral surface 23 while facing the inner peripheral surface 23. A cylindrical outer surface 32, an annular horizontal surface 33, and a cylindrical vertical surface 34 that defines the notch 6 in cooperation with the horizontal surface 33.

  The compression ring 8 includes a pair of compression ring pieces 8a and 8b that are concentric with each other and are arranged on the inner peripheral side and the outer peripheral side.

  The compression ring piece 8a on the inner peripheral side made of nylon-66 has a cylindrical shape which is bonded and fixed to the cylindrical vertical surface 34 of the rubber elastic body 7 defining the notch 6 through a vulcanization bonding means or the like. An inner peripheral surface 41, an annular upper surface 43 slidably contacting the annular lower surface 42 of the intermediate plate 13 in the radial direction H, and an annular horizontal surface 33 of the rubber elastic body 7 defining the notch 6. An annular lower surface 44 that is bonded and fixed through vulcanization adhesion means or the like, and an annular inclination that is inclined with respect to the lower surface 44 so that the diameter gradually decreases from the lower surface 44 toward the upper surface 43. And an outer peripheral surface 45.

  The compression ring piece 8b on the outer peripheral side made of nylon-66 is opposed to the cylindrical inner peripheral surface 23 in the radial direction H of the lower collar 4 that defines the recess 3, and in the vertical direction V on the inner peripheral surface 23. A cylindrical outer peripheral surface 51 that is slidably in contact with the ring, and an annular lower surface that is bonded and fixed to the annular horizontal surface 33 of the rubber elastic body 7 defining the notch 6 via a vulcanizing adhesive means. 52, an annular upper surface 53 slidably contacting the annular lower surface 42 of the intermediate plate 13 in the radial direction H, and the upper surface so that the diameter gradually increases from the upper surface 53 toward the lower surface 52. 53 and an annular inclined inner peripheral surface 55 that is inclined in a complementary manner with the inclined outer peripheral surface 45 of the compression ring piece 8a on the inner peripheral side and slidably contacts the inclined outer peripheral surface 45. ing.

  The inclined outer peripheral surface 45 is inclined with respect to the lower surface 44 at an angle α of 45 ° with respect to the lower surface 44, and the inclined inner peripheral surface 55 is inclined with respect to the upper surface 53 at an angle β of 45 ° with respect to the upper surface 53. It is inclined with respect to it.

  A rigid metal intermediate plate 13 such as S45CN having a recess 12 in the upper surface 11 is cylindrical with respect to a cylindrical inner peripheral surface 23 that defines the recess 3 with a cylindrical outer peripheral surface 61. A circle disposed in the recess 3 with a gap 62 and slidably contacting the upper surface 5 of the rubber elastic body 7 and the upper surfaces 43 and 53 which are the upper surfaces of the compression ring 8 with a circular lower surface 42 slidably in the radial direction H. A columnar base 63 and a columnar protrusion 65 which is formed concentrically and integrally with the base 63 and has a cylindrical outer peripheral surface 64 smaller in diameter than the outer peripheral surface 61 of the base 63. .

  The sliding plate 14 based on a fiber reinforced thermosetting resin is slidably contacted with respect to the radial direction H to the lower surface 72 of the upper rod U fixed to the bridge girder at the sliding surface 71 in which a solid lubricant is embedded. ing.

  The rubber bearing 1 fixed to the pier D elastically supports the V load in the vertical direction of the bridge girder with the rubber elastic body 7 through the upper collar U and also vibrates in the radial direction H of the bridge girder with respect to the pier D. Allowing the sliding between the sliding surface 71 and the lower surface 72, and elastically allowing rotation (swing) with an angle θ of the bridge girder D with respect to the bridge pier D corresponding to the size of the gap 62 at the vertical axis O, The bridge girder is supported on the pier D.

  By the way, according to such a rubber bearing 1, the compression ring 8 includes a pair of compression ring pieces 8a and 8b, the compression ring piece 8a has the inclined outer peripheral surface 45, and the compression ring piece 8b is inclined. By having an inclined inner peripheral surface 55 that slidably contacts the outer peripheral surface 45, by applying a vertical load at the outer edge of the intermediate plate 13 in rotation with an angle θ of the bridge girder with respect to the pier D By compressing the compression ring 8, the outer peripheral surface 51 of the compression ring piece 8 b can be brought close to the inner peripheral surface 23 greatly and easily. In this example, the outer peripheral surface 51 is slidably and strongly contacted by the inner peripheral surface 23 (adhesion). As a result, the gap 62 between the lower collar 4 and the intermediate plate 13 can be reliably sealed, and thus the rubber elastic body 7 from the gap 62 between the lower collar 4 and the intermediate plate 13 can be sealed. Can reduce the protrusion of the partial pressure deformation of rubber elastic body You can avoid the loss can be maintained its original function for a long time.

  In addition, according to the rubber bearing 1, the compression ring piece 8 a follows the elastic deformation of the rubber elastic body 7 because the compression ring piece 8 a is bonded and fixed to the vertical surface 34 by the inner peripheral surface 41. In addition, since the compression ring pieces 8a and 8b are bonded and fixed to the horizontal surface 33 by the lower surfaces 44 and 52, the rubber elastic body 7 is restrained and the elastic deformation of the rubber elastic body 7 accompanied by the pressure deformation is restrained. It can suppress, and the amount of partial deformation of the rubber elastic body 7 can be reduced.

  Furthermore, according to the rubber bearing 1, since each of the compression ring pieces 8a and 8b is made of nylon-66 having a certain rigidity, the intermediate plate 13 is rotated at an angle θ of the bridge girder with respect to the pier D. When the vertical load is applied at the outer edge, the vertical load applied at the outer edge of the upper surface 5 of the rubber elastic body 7 can be reduced. As a result, the partial deformation of the rubber elastic body 7 can be reduced. It is possible to reduce the protruding deformation of the rubber elastic body 7 from the gap 62 between the flange 4 and the intermediate plate 13 and to avoid the disappearance of the rubber elastic body 7. The function can be maintained.

  By the way, in the above example, the inclined outer peripheral surface 45 of the compression ring piece 8 a gradually decreases in diameter from the lower surface 44 toward the upper surface 43, while the inclined inner peripheral surface 55 of the compression ring piece 8 b is changed from the upper surface 53. Instead of gradually increasing the diameter toward the lower surface 52, the inclined outer peripheral surface 45 of the compression ring piece 8a is gradually increased from the lower surface 44 toward the upper surface 43 as shown in FIG. On the other hand, the inclined inner peripheral surface 55 of the compression ring piece 8b may gradually become smaller in diameter from the upper surface 53 toward the lower surface 52 while increasing the diameter.

  In the example shown in FIG. 4 as well, the same action can be obtained, and the gap 62 between the lower lid 4 and the intermediate plate 13 can be more reliably sealed. It is possible to reduce the protrusion of the pressure-deformation deformation of the rubber elastic body 7 from the gap 62 between them, so that the disappearance of the rubber elastic body 7 can be avoided and the original function can be maintained over a long period of time.

DESCRIPTION OF SYMBOLS 1 Rubber support 2, 5, 11, 43, 53 Upper surface 3 Recess 4 Lower collar 6 Notch 7 Rubber elastic body 8 Compression ring 8a, 8b Compression ring piece 12 Recess 13 Intermediate plate 14 Sliding plate 33 Horizontal surface 23, 41 In Peripheral surfaces 42, 44, 52 Lower surface 45 Inclined outer peripheral surface 51 Outer peripheral surface 55 Inclined inner peripheral surface D Bridge pier U

Claims (15)

  A lower collar having a circular recess on the upper surface, a disk-like rubber elastic body fitted in the lower flange and having an annular notch on the outer edge of the circular upper surface, and the rubber elasticity A compression ring arranged in a notch in the body and fitted in a recess in the lower collar, and a rubber elastic body and a compression ring stacked on the rubber elastic body and the compression ring and partially in the recess in the lower collar And an intermediate plate that protrudes outside the recess of the lower collar in the vertical direction, and the compression rings are at least concentric with each other and disposed on the inner peripheral side and the outer peripheral side. The compression ring piece on the inner peripheral side includes a cylindrical inner peripheral surface that is in contact with a cylindrical vertical surface of a rubber elastic body that defines the notch, and an annular annular plate. An annular upper surface that is in contact with the lower surface of the rubber, and an annular water of rubber elastic body that defines the notch An annular lower surface that is in contact with the surface, and an annular inclined outer peripheral surface that is inclined with respect to the lower surface so that the diameter gradually changes from the lower surface toward the upper surface. The ring piece has an annular outer surface in contact with a cylindrical inner peripheral surface in the radial direction of the lower collar that defines the recess, and an annular horizontal surface of the rubber elastic body that defines the notch. Inclined outer periphery of the compression ring piece on the inner peripheral side with respect to the upper surface such that the lower surface, the annular upper surface contacting the annular lower surface of the intermediate plate, and the diameter gradually varies from the upper surface toward the lower surface A rubber bearing having an annular inclined inner peripheral surface that is inclined in a complementary manner to the surface and slidably contacts with an inclined outer peripheral surface of the compression ring piece on the inner peripheral side.   The inclined outer peripheral surface is inclined at an angle of 30 ° to 60 ° with respect to the lower surface of the inner peripheral compression ring piece, and the inclined inner peripheral surface is from 30 ° with respect to the upper surface of the outer peripheral compression ring piece. The rubber bearing according to claim 1, wherein the rubber bearing is inclined at an angle of 60 °.   The inclined outer peripheral surface is inclined so that the diameter gradually decreases from the lower surface of the inner peripheral compression ring piece toward the upper surface of the inner peripheral compression ring piece. The rubber bearing according to claim 1, wherein the rubber bearing is inclined so that the diameter gradually increases from the upper surface of the compression ring piece toward the lower surface of the compression ring piece on the outer peripheral side.   The inclined outer peripheral surface is inclined so as to gradually increase in diameter from the lower surface of the inner peripheral side compression ring piece toward the upper surface of the inner peripheral side compression ring piece. The rubber bearing according to claim 1, wherein the rubber bearing is inclined so that the diameter gradually decreases from the upper surface of the compression ring piece on the side toward the lower surface of the compression ring piece on the outer peripheral side.   The rubber according to any one of claims 1 to 4, wherein a cylindrical inner peripheral surface of the compression ring piece on the inner peripheral side is bonded and fixed to a cylindrical vertical surface of a rubber elastic body that defines a notch. Support.   The rubber bearing according to any one of claims 1 to 5, wherein an annular lower surface of the compression ring piece on the inner peripheral side is bonded and fixed to an annular horizontal surface of a rubber elastic body that defines a notch.   The rubber bearing according to any one of claims 1 to 6, wherein an annular lower surface of the outer peripheral compression ring piece is bonded and fixed to an annular horizontal surface of a rubber elastic body that defines a notch.   The rubber bearing according to any one of claims 1 to 7, wherein the compression ring piece on the inner peripheral side is made of nylon-66.   The rubber bearing according to any one of claims 1 to 8, wherein the outer peripheral compression ring piece is made of nylon-66.   The cylindrical outer peripheral surface of the compression ring piece on the outer peripheral side is in slidable contact with the cylindrical inner peripheral surface in the radial direction of the lower collar defining the recess in the vertical direction. The rubber bearing according to item 1.   The rubber bearing according to any one of claims 1 to 10, wherein the intermediate plate has a recess on a circular upper surface thereof.   The rubber bearing according to claim 11, further comprising a sliding plate fitted in a recess on the upper surface of the intermediate plate.   The rubber bearing according to claim 12, wherein the sliding plate is made of a fiber reinforced thermosetting resin as a base material and a solid lubricant is embedded in the sliding surface.   The intermediate plate is arranged in the recess of the lower collar with a cylindrical gap with respect to the cylindrical inner peripheral surface defining the recess of the lower collar on the cylindrical outer peripheral surface, and on the circular lower surface, the rubber elastic body A cylindrical base that is in contact with the circular top surface of the compression ring and the annular top surface of the compression ring, and a cylindrical shape that is concentrically integrated with the base and has a smaller diameter than the cylindrical outer peripheral surface of the base. The rubber bearing according to any one of claims 1 to 13, further comprising a columnar protrusion having an outer peripheral surface, wherein an upper surface of the protrusion is an upper surface of the intermediate plate.   The rubber bearing according to any one of claims 1 to 14, wherein the rubber bearing is used between a bridge pier and a bridge girder.

Images