JP2014163115A - Rubber bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber bearing capable of reducing an excessive partial pressure deformation content of a rubber elastic body toward a clearance between a lower shoe and an intermediate plate, capable of surely sealing the clearance between the lower shoe and the intermediate plate, capable of reducing projection of the partial pressure deformation content from the clearance between the lower shoe and the intermediate plate, capable of avoiding vanishing of the rubber elastic body, and capable of maintaining a primary function for a long time.SOLUTION: A rubber bearing 1 includes: a lower shoe 4 having a circular recession 3 on an upper surface 2; a disk shaped rubber elastic body 7 fitted to the recession 3 and having an annular cutout 6 in an outer edge of a circular upper surface 5; a compression ring 8 arranged in the cutout 6 and fitted to the recession 3; an intermediate plate 13 superimposed on the rubber elastic body 7 and the compression ring 8 in upper parts of the rubber elastic body 7 and the compression ring 8, partially arranged in the recession 3, protruded to the outside of the recession 3 in a vertical direction V, and having a circular recession 12 on an upper surface 11; and a disk shaped slide plate 14 fitted to the recession 12.

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 possibility that the outer peripheral portion of the rubber elastic body may be lost by protruding from the gap between them, the elastic support function of the rubber elastic body is deteriorated by the disappearance of the outer peripheral portion of the rubber elastic body, and the rubber support book is used for a long time use. Function can not be exhibited in.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to reduce an excessive amount of partial deformation of the rubber elastic body toward the gap between the lower plate and the intermediate plate, and The gap between the lower arm and the intermediate plate can be sealed more reliably, and the protrusion of the elastic deformation of the rubber elastic body from the gap between the lower arm and the intermediate plate can be reduced. An object of the present invention is to provide a rubber bearing capable of avoiding loss of an elastic body and maintaining its original function for 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 disposed in a notch of the rubber elastic body and fitted in a recess of the lower collar, and a rubber elastic body and a compression ring stacked above the rubber elastic body and the compression ring. An intermediate plate partially disposed in the recess of the flange and projecting out of the recess of the lower flange with respect to the vertical direction, and the rubber elastic body has a radial direction of the lower flange defining the recess It has an annular space provided between the compression ring and the lower collar in the vertical direction and opened at the outer peripheral surface of the rubber elastic body facing the cylindrical inner peripheral surface.

  According to such a rubber bearing, it opens at the outer peripheral surface of the rubber elastic body facing the cylindrical inner peripheral surface in the radial direction of the lower collar defining the recess, and between the compression ring and the lower collar in the vertical direction. Since the rubber elastic body has the annular space provided, the vertical at the outer edge of the intermediate plate in the rotation (swing) of the upper structure such as the bridge girder relative to the lower structure such as the pier When the load is applied, the excessive elastic pressure deformation in the radial direction of the rubber elastic body due to the elastic deformation of the rubber elastic body can be absorbed in the void together with the elastic deformation, and the compression ring is arranged in the notch of the rubber elastic body. Since it is fitted in the recess of the lower arm, the gap between the lower arm and the intermediate plate can be sealed more securely, and thus the bias deformation from the gap between the lower arm and the intermediate plate The protrusion of the minute can be reduced, the disappearance of the rubber elastic body can be avoided, and the original function can be maintained for a long time.

  In the rubber bearing of the present invention, the number of compression rings arranged in the notch of the rubber elastic body and fitted in the recess of the lower collar may be one or a plurality of compression rings stacked in the vertical direction.

  In a preferred example of the rubber bearing of the present invention, the cylindrical outer peripheral surface of the compression ring is in slidable contact with respect to the vertical cylindrical inner peripheral surface of the lower collar defining the recess in the vertical direction.

  According to the rubber bearing of such an example, the cylindrical outer peripheral surface of the compression ring is lowered in the application 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. As a result of being able to slidably contact closely with the inner circumferential surface of the radial direction that defines the recess of the ridge, the gap between the lower heel and the intermediate plate can be more reliably sealed, such as a bridge pier It is possible to further reduce the protrusion of the elastic deformation of the rubber elastic body from the gap between the lower plate and the intermediate plate in the rotation of the upper structure such as a bridge girder with respect to the lower structure.

  In another preferred example of the rubber bearing according to the present invention, the compression ring is slidably in contact with an annular horizontal surface of a rubber elastic body that defines a notch at its annular lower surface.

  According to the sliding bearing of such an example, as a result of being able to ensure easy stretchability in the radial direction of the compression ring with respect to the annular horizontal surface of the rubber elastic body defining the notch, the radial bearing defining the recess of the lower collar Lower contact in rotation of upper structure such as bridge girder to lower structure such as bridge pier, which can secure more slidable close contact of cylindrical outer surface of compression ring to cylindrical inner peripheral surface It is possible to further reduce the protrusion of the elastic deformation of the rubber elastic body from the gap between the intermediate plate and the intermediate plate.

  In the rubber bearing of the present invention, as described above, the compression ring may be slidably brought into contact with the annular horizontal surface of the rubber elastic body that defines the notch at the annular lower surface. The compression ring may be bonded and fixed to the annular horizontal surface of the rubber elastic body that defines a notch on the lower surface of the circular ring through vulcanization bonding means or the like. As a result of being constrained by the compression ring, it is possible to reduce the degree of radial deformation of the bias deformation portion of the rubber elastic body.

  In the present invention, the compression ring may be slidably in contact with the cylindrical vertical surface of the rubber elastic body that defines the notch on the cylindrical inner peripheral surface. It may be bonded and fixed to a cylindrical vertical surface of a rubber elastic body that defines a notch on the inner peripheral surface of the shape via a vulcanization bonding means or the like.

  Such a compression ring may be formed of a copper or stainless steel metal or a synthetic resin such as nylon, and is suitable for reducing the creep deformation of a rubber elastic body. In particular, it may be formed from a synthetic resin such as nylon-66.

  In the rubber bearing of the present invention, in a preferred example, the void has a rectangular, trapezoidal, semi-circular, semi-elliptical or triangular longitudinal cross-sectional shape, and such void is long in the radial direction of the notch. You may have the length of the radial direction shorter than this.

  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, it is possible to reduce the excessive bias deformation of the rubber elastic body toward the gap between the lower rod and the intermediate plate, and more reliably seal the gap between the lower rod and the intermediate plate. Therefore, it is possible to reduce the protrusion of the elastic deformation of the rubber elastic body from the gap between the lower arm and the intermediate plate, to avoid the disappearance of the rubber elastic body, and to maintain the original function for a long time. Can provide a rubber bearing that can.

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. Open at the outer peripheral surface 32, the annular horizontal surface 33, the cylindrical vertical surface 34 defining the notch 6 in cooperation with the horizontal surface 33, and the outer peripheral surface 32 facing the inner peripheral surface 23. It has a rectangular longitudinal section with a radial length L which is provided between the compression ring 8 and the lower collar 4 in the direction (vertical direction) V and is shorter than the length in the radial direction H of the notch 6. And an annular space 35.

  The compression ring 8 includes a cylindrical outer peripheral surface 41 slidably contacting the inner peripheral surface 23 with respect to the vertical direction V, an annular lower surface 42 slidably contacting the horizontal surface 33 with respect to the radial direction H, and a vertical surface. 34 has a cylindrical inner peripheral surface 43 that is slidably contacted with respect to the vertical direction V, and an annular upper surface 45 that is slidably contacted with the lower surface 52 of the intermediate plate 13 with respect to the radial direction H.

  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 cylindrical base 63 disposed in the recess 3 with a gap 62 and contacting the upper surface 5 of the rubber elastic body 7 and the upper surface 45 of the compression ring 8 with a circular lower surface 52, and concentrically integrated with the base 63. And a columnar protrusion 65 having a cylindrical outer peripheral surface 64 having a diameter smaller than that of 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 support 1 fixed to the pier D elastically supports the load of the bridge girder with the rubber elastic body 7 via the upper arm U and also vibrates the bridge g with respect to the bridge pier D in the radial direction H with the sliding surface 71. On the pier D, it is allowed to slide with the lower surface 72 and is elastically allowed to rotate (swing) with an angle θ at the vertical axis O of the bridge girder relative to the pier D corresponding to the size of the gap 62. In support of the bridge girder.

  By the way, according to such a rubber bearing 1, since the rubber elastic body 7 has the void 35, the rubber is applied in the vertical load at the outer edge of the intermediate plate 13 in the rotation of the bridge girder with respect to the pier D. Excessive pressure deformation in the radial direction H of the elastic body 7 can be absorbed in the void 35, and the compression ring 8 is arranged in the notch 6 and is fitted in the recess 3. The gap 62 between the intermediate plate 13 and the intermediate plate 13 can be sealed more reliably, the protrusion of the rubber elastic body 7 from the gap 62 can be reduced, and the disappearance of the rubber elastic body 7 can be avoided. The original function can be maintained for a long time.

  Moreover, according to such a rubber bearing 1, the outer peripheral surface 41 of the compression ring 8 is more slidable when a vertical load is applied to the outer edge of the intermediate plate 13 in the rotation with the angle θ of the bridge girder with respect to the pier D. As a result, the gap 62 between the lower arm 4 and the intermediate plate 13 can be more reliably sealed, and the rotation of the bridge girder D with respect to the pier D can be achieved. The protrusion of the elastic deformation body 7 from the gap 62 between the lower rod 4 and the intermediate plate 13 can be further reduced.

  Furthermore, according to the rubber bearing 1, since the compression ring 8 is slidably in contact with the horizontal surface 33 at the annular lower surface 42, the radial direction H of the compression ring 8 with respect to the horizontal surface 33 of the rubber elastic body 7 is provided. As a result, it is possible to reduce excessive biasing deformation of the rubber elastic body 7 during the rotation with the angle θ of the bridge girder with respect to the pier D. The protrusion of the partial pressure deformation from the gap 62 can be reduced.

  In the rubber bearing 1, the void 35 has a rectangular vertical cross-sectional shape. Alternatively, as shown in FIG. 4, the void 35 may have a triangular vertical cross-sectional shape. Also, it is possible to absorb excessive bias deformation in the radial direction H of the rubber elastic body 7.

DESCRIPTION OF SYMBOLS 1 Rubber bearing 2, 5, 11 Upper surface 3, 12 Recess 4 Lower collar 6 Notch 7 Rubber elastic body 8 Compression ring 13 Intermediate plate 35 Space D Deck U U

Claims (13)

  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 are stacked above 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 rubber elastic body has a cylindrical inner peripheral surface in the radial direction of the lower collar that defines the recess. A rubber bearing having an annular space that is opened between the compression ring and the lower collar in the vertical direction and is opened at the outer peripheral surface of the rubber elastic body facing the.   The rubber bearing according to claim 1, wherein a cylindrical outer peripheral surface of the compression ring is slidably in contact with a cylindrical inner peripheral surface in a radial direction of a lower collar defining the recess in the vertical direction.   The rubber bearing according to claim 1, wherein the compression ring is slidably in contact with an annular horizontal surface of a rubber elastic body that defines a notch at an annular lower surface thereof.   The rubber bearing according to claim 1 or 2, wherein the compression ring is bonded and fixed to an annular horizontal surface of a rubber elastic body that defines a notch at an annular lower surface thereof.   The rubber bearing according to any one of claims 1 to 4, wherein the compression ring is slidably in contact with a cylindrical vertical surface of a rubber elastic body defining a notch at a cylindrical inner peripheral surface thereof. .   The rubber bearing according to any one of claims 1 to 4, wherein the compression ring is bonded and fixed to a cylindrical vertical surface of a rubber elastic body that defines a notch at a cylindrical inner peripheral surface thereof.   The rubber bearing according to any one of claims 1 to 6, wherein the void has a rectangular, trapezoidal, semicircular, semielliptical, or triangular longitudinal cross-sectional shape.   The rubber bearing according to any one of claims 1 to 7, wherein the void has a length in a radial direction shorter than a length in a radial direction of the notch.   The rubber bearing according to any one of claims 1 to 8, wherein the intermediate plate has a recess on a circular upper surface thereof.   The rubber bearing according to claim 9, further comprising a sliding plate fitted in a recess on the upper surface of the intermediate plate.   The rubber bearing according to claim 10, 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 11, further comprising a columnar protruding portion having an outer peripheral surface, wherein an upper surface of the protruding portion is an upper surface of the intermediate plate.   The rubber bearing according to any one of claims 1 to 12, wherein the rubber bearing is used by being arranged between a bridge pier and a bridge girder.

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