JP2017115359A - Seal ring for support bearing plate bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal ring for support bearing plate bearing capable of preventing damage due to twist which is generated between an upper shoe and the seal ring.SOLUTION: The seal ring is a seal ring which is incorporated into a bearing plate bearing (sealed rubber bearing plate bearing or high strength yellow copper bearing plate bearing) which is disposed between an upper structure and a lower structure of a bridge. The seal ring is constituted of a ring body 11 of an elastic material and a tubular cladding 12 which has slipping property and covers the outer periphery of the ring body 11. The cladding 12 is constituted of a fiber cloth in which fiber material having the slipping property is woven into a tubular shape.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a seal ring in a support plate support, and more particularly to a seal ring incorporated in a support plate support installed between an upper structure and a lower structure of a bridge.

  As one of the supports for transmitting the load of the superstructure to the substructure in the bridge, there is known a support plate support having a horizontal movement function and a vertical rotation function of the superstructure by sliding in addition to the load transmission function. . The bearing plate bearing includes a sealed rubber bearing plate bearing and a high-strength brass bearing plate bearing (see Non-Patent Document 1, for example).

  Sealed rubber support plate support inserts a rubber plate (elastic body) into a recess called a pot section provided on the lower arm and then inserts an intermediate plate to seal the rubber plate, and a recess is formed on the upper surface of the intermediate plate. A sliding plate made of tetrafluoroethylene resin (PTFE) is fitted and provided with a vertical rotation function by elastic deformation of the rubber plate and a horizontal movement function by sliding with the upper plate of the sliding plate.

  The high-strength brass support plate support is a sliding plate made of PTFE by fitting a support plate having a convex spherical surface formed on the bottom surface to a concave spherical surface portion provided on the lower collar and providing a recess on the top surface of the support plate. Are fitted, and a vertical rotation function is given by sliding between spherical parts, and a horizontal movement function is given by sliding with the upper plate of the sliding plate.

  In such a support plate support, a sliding plate, a pot part for a sealed rubber support plate support, a concave spherical part for a high-strength brass support plate support, etc. If dust, water, or the like enters the support main part, the horizontal movement function or the vertical rotation function will be impaired. Therefore, conventionally, cylindrical seal rings made of chloroprene rubber have been arranged on the outer periphery of the intermediate plate for sealed rubber bearing plate bearings, and on the outer periphery of the support plate for high-strength brass bearing plate bearings. And water etc. are prevented from entering the bearing main part.

  However, since the seal ring is installed in a compressed state in order to ensure the tightness of the gap between the upper collar and the lower collar, between the upper collar and the seal ring due to the horizontal movement of the upper structure. There is a problem that the seal ring is twisted and rotated due to the generated friction.

“Road Bridge Support Manual (revised version)”, Japan Road Association, August 2008, p. 43-45

The present invention has been made based on the technical background as described above, and achieves the following object.
An object of the present invention is to provide a seal ring in a support plate support that can prevent damage caused by twisting with an upper collar.

The present invention employs the following means in order to achieve the above object.
That is, the present invention is a seal ring incorporated in a support plate support,
A seal ring in a bearing plate support comprising a ring body made of an elastic material and a cylindrical covering material having a sliding property covering the outer periphery of the ring body.

  More specifically, the covering material can be constituted by a fiber cloth in which a fiber material having slipperiness is knitted into a cylindrical shape. As the fiber material, a fluororesin fiber spun yarn can be used.

  According to the present invention, since the seal ring has the covering material having the slip property on the outer periphery, the seal ring does not slip and twist with the upper collar, and the damage can be prevented.

It is the front view which showed the sealing rubber bearing plate bearing as an example of the bearing plate bearing in which the seal ring by this invention is integrated, and looked at the bridge axial direction. It is the vertical direction sectional view seen along the same direction of the bearing. It is a top view which shows embodiment of the seal ring by this invention. It is an expanded sectional view by the AA arrow of FIG. It is a perspective view which shows how to make the seal ring by this invention. FIG. 6 is a plan view showing how to make following FIG. 5.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a support plate support in which a seal ring according to the present invention is incorporated. FIG. 1 is a front view taken along the bridge axis direction, and FIG. 2 is a vertical sectional view taken along the same direction. The support plate support shown in the illustrated example is a sealed rubber support plate support.

  The sealed rubber bearing plate support 50 includes an upper collar 51 and a lower collar 52. In the illustrated example, the upper rod 51 is attached to a sole plate 54 on the lower surface of the upper structure 53 shown as a steel girder via a set bolt 55. The shear key 56 provided on the upper surface of the upper collar 51 is fitted in a key hole provided on the sole plate 54 to transmit the horizontal load of the upper structure 53 to the upper collar 51.

  A base plate 59 is fixed to the lower structure 57 such as a pier via an anchor bolt 58, and a lower rod 52 is fixed to the base plate 59 by welding or the like. Side blocks 60 for restricting the movement of the upper structure 53 in the direction perpendicular to the bridge axis are provided on both sides of the lower rod 52 along the bridge axis direction. The side block 60 is provided with an engaging portion 60 a for engaging with the upper surface of the upper collar 51 and receiving an uplift force acting on the upper structure 53.

  The lower rod 52 is provided with a pot portion (concave portion) 61 having a circular cross section at the center, and a rubber plate 62 is accommodated at the bottom of the pot portion 61. Furthermore, the intermediate plate 63 is fitted to the pot portion 61 in a state of being placed on the rubber plate 62 and having an upper portion protruding from the pot portion 61. The load of the upper structure 53 is transmitted from the upper collar 51 to the lower collar 52 via the intermediate plate 63, and the rubber plate 62 is elastically deformed, whereby the upper structure 53 can be rotated in the vertical direction.

  A recess is formed on the upper surface of the intermediate plate 63, and a slip plate 64 made of tetrafluoroethylene resin (PTFE) is fitted into the recess. On the other hand, a slide plate 65 made of stainless steel is provided on the lower surface of the upper collar 51 in contact with the intermediate plate 63, and the upper structure 53 can be moved horizontally in the bridge axis direction by sliding between the slide plates 64 and 65. Yes.

  The inside of the pot portion 61 and the upper surface of the sliding plate 64 are essential portions for allowing the sealed rubber bearing plate support to have a vertical rotation function and a horizontal movement function, respectively. In order to prevent dust, water, and the like from entering the main portions from the gap between the upper rod 51 and the lower rod 52, the seal ring 10 is placed on the outer periphery of the intermediate plate 63 protruding from the pot portion 61. It arrange | positions in the state compressed by the collar 51. FIG.

  3 and 4 show an embodiment of a seal ring 10 according to the present invention, FIG. 3 is a plan view, and FIG. 4 is a cross-sectional view taken along line AA in FIG. The seal ring 10 includes a ring body 11 and a covering material 12.

  The ring body 11 is similar to a conventional seal ring, is a cylindrical rubber ring, and is made of chloroprene rubber. The covering material 12 is also cylindrical, and its inner diameter is equal to or larger than the outer diameter of the ring body 11 and covers the entire outer periphery of the ring body 11.

  The covering material 12 is made of a fiber cloth in which a fibrous material having slipperiness is knitted into a cylindrical shape, and has flexibility. In this embodiment, a fluororesin fiber spun yarn such as tetrafluoroethylene resin (PTFE) is used as a fiber material having slipperiness. Specifically, a fiber in which a fluororesin fiber and polyester are knitted in a double structure is used.

  5 and 6 show how to make the seal ring 10. First, as shown in FIG. 5, a straight rubber tube 11 a and a covering material 12 which are materials of the ring body 11 are prepared, and the covering material 12 is put on the outer periphery of the rubber tube 11 a from one end side thereof. The covering material 12 may be sewed on the outer periphery of the rubber tube 11a with a flat cloth. Next, as shown in FIG. 6, the rubber tube 11 a is rounded, both ends thereof are butted together and bonded with an adhesive. Thereby, the ring main body 11 is comprised. A portion indicated by reference numeral 13 is an adhesive portion.

  At the time of this bonding, both end portions of the covering material 12 are rolled in a bellows shape to expose both end portions of the rubber tube 11a. And after adhesion | attachment, the wound part of the coating | covering material 12 is returned, and the whole ring main body 11 is covered with the coating | covering material 12 as shown in FIG.

  The seal ring 10 is disposed on the outer periphery of the intermediate plate 63 when the sealed rubber support plate support is assembled. The sealed rubber support plate support in which the seal ring 10 is incorporated is installed between the upper structure 53 and the lower structure 57 of the bridge as shown in FIGS.

  The horizontal movement of the upper structure 53 causes a slip between the upper collar 51 and the intermediate plate 63, but the seal ring 10 has the covering material 12 having a slip property on the outer periphery. Similar to the upper sliding plate 64, the seal ring 10 itself also becomes a sliding surface and slips between the upper collar 51. Therefore, the seal ring 10 is not rotated or twisted as in the prior art, and can be prevented from being damaged.

  In the above embodiment, the example in which the seal ring according to the present invention is incorporated in the sealed rubber bearing plate bearing has been described. However, the seal ring according to the present invention is incorporated in the outer periphery of the high strength brass bearing plate bearing, specifically the bearing plate. The same function can be demonstrated. In the above embodiment, a hollow cylindrical body is shown as the ring body, but the ring body may be solid.

10: Seal ring 11: Ring body 12: Covering material 13: Adhesive part 51: Upper collar 52: Lower collar 61: Pot part 62: Rubber plate 63: Intermediate plate

Claims (3)

A seal ring incorporated in the support plate support,
A seal ring in a support plate support, comprising: a ring body made of an elastic material; and a cylindrical covering material having a slipperiness covering the outer periphery of the ring body.   2. A seal ring in a support plate support according to claim 1, wherein the covering material is made of a fiber cloth knitted in a cylindrical shape with a sliding fiber material.   3. The seal ring in a support plate support according to claim 2, wherein the fiber material is a fluororesin fiber spun yarn.

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