JP4918307B2 - Bearing device - Google Patents

Description

  The present invention relates to a support device suitable for supporting a bridge, a building, a machine, or the like, and more particularly to a bridge support device.

  Up to now, by placing a rubber bearing between an upper structure such as a bridge and a lower structure such as a pier, the force acting from the upper structure is transmitted to the lower structure, and the load of the upper structure is loaded. Absorption of deflection and torsional deformation is performed. This rubber bearing is composed of an upper collar fixed to the upper structure, a lower collar fixed to the lower structure by anchor bolts, and a rubber layer disposed therebetween. A downward vertical load is supported by the rubber support.

  On the other hand, with respect to horizontal load and vertical upward movement, for example, by placing and fixing a side block (movement limiting device) on the side end of the rubber bearing body, the horizontal direction of the upper structure and the lower structure and Restricts upward movement in the vertical direction.

  However, when the vertical load is supported by the rubber support and the horizontal load is supported by the movement restriction device such as the side block, the entire device including the rubber support becomes larger and heavier and the construction is complicated. Thus, there is a problem that the cost increases. Moreover, when the whole apparatus becomes large, construction may not be possible if the under-girder space is narrow.

In order to solve such a problem, Patent Document 1 describes a rubber bearing body 50 as shown in FIGS. 4 and 5. In the rubber bearing 50, a recess 53 is formed on the upper collar 51 on a surface facing the lower collar 52, and the lower collar 52 is a surface facing the upper collar 51 and corresponds to the recess 53 of the upper collar 51. A convex portion 54 that fits with the concave portion 53 is formed at a position, and a fitting portion is formed by fitting the upper collar 51 and the lower collar 52 via the rubber layer 55.
Thereby, the vertical load is supported by this rubber bearing body 50 by the horizontal surface of the upper collar 51, the horizontal surface of the lower collar 52 facing the horizontal plane, and the rubber layer 55 disposed between these horizontal planes. In addition, since the horizontal load is supported by the inner surface of the recess 53 in the fitting portion, the outer surface of the convex portion 54 facing the side surface, and the rubber layer 55 disposed between these side surfaces, Only the rubber support 50 can support not only a vertical load but also a horizontal load, and the apparatus can be downsized.

  In such a rubber support 50, since the concave portion 53 and the convex portion 54 are fitted in the vertical direction, the load supporting ability is improved with respect to the force acting in the horizontal direction (indicated by an arrow H in FIG. 5). In order to achieve this, a large load support area is required.

  However, in order to increase the load support area with respect to the force in the horizontal direction, it is necessary to increase the depth and height in the vertical direction of the concave portion 53 and the convex portion 54 and to increase the fitting length of the concave portion 53 and the convex portion 54. There is. Therefore, the thickness of the rubber bearing body 50 is increased, and it is difficult to make the bearing compact.

JP 2005-337002 A

  An object of the present invention is to provide a bearing device that is thin and can be made compact.

  A support device according to the present invention for solving the above-described problems includes a lower frame fixed to the lower structure when fixed to the upper structure, and an elastic layer disposed therebetween, The frame has a concave portion and / or a convex portion formed on a surface facing the lower frame, and the lower frame is a surface opposed to the upper frame and corresponds to the concave portion and / or convex portion of the upper frame. Protrusions and / or recesses that fit with these are formed at positions where the upper frame and the lower frame are fitted via the elastic layer to form a fitting portion, and are fitted to each other. The convex part and the concave part have an inclined wall surface.

  A protrusion is formed on at least one of the surfaces where the protrusion and the recess face each other. Preferably, the protrusion is formed on at least one of the top of the protrusion and the opening edge of the recess and protrudes in the horizontal direction.

  According to the present invention, since both the convex portion and the concave portion to be fitted to each other have inclined wall surfaces, the fitting length between the concave portion and the convex portion is larger than that of the vertical wall surface, and the horizontal direction It is possible to increase the load supporting area with respect to the force. As a result, it is possible to reduce the thickness of the support device and reduce the size of the support without impairing the vertical load support performance and the horizontal load support performance. Further, when the thickness of the support device is the same, the horizontal load support performance is further improved as compared with the support device having a vertical wall surface.

  In addition, since a protrusion is formed on at least one of the surfaces where the protrusion and the recess face each other, the upper and lower frames deviate by the protrusion when a force is applied in the horizontal direction. And the swelling of the elastic layer due to the vertical load can be suppressed by the protrusions.

  Hereinafter, a rubber support device for a bridge according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a rubber bearing device according to this embodiment, and FIG. 2 is a partially enlarged sectional view thereof.

  As shown in FIGS. 1 and 2, the rubber bearing device 1 according to this embodiment includes an upper rod 2 fixed to an upper structure such as a bridge via a sole plate 10, and a base plate to a lower structure such as a bridge pier. And a rubber layer 4 (elastic layer) disposed between them.

  The lower collar 3 has a substantially cylindrical first convex portion 3a on a surface facing the upper collar 2, and a substantially cylindrical shape spaced apart from the first convex portion 3a and surrounding the first convex portion 3a. A second convex portion 3b is formed. On the other hand, the upper flange 2 has a first concave portion 2a and a first concave portion that are fitted to the upper flange 2 at positions corresponding to the first convex portion 3a and the second convex portion 3b on the surface facing the lower rod 3. Two recesses 2b are formed. Then, the upper hook 2 and the lower hook 3 are fitted via the rubber layer 4 so that two fitting portions A and B are formed as shown in FIG.

  The rubber layer 4 is bonded to the upper collar 2 and the lower collar 3 over the entire surface including the inner circumferential surfaces of the recesses 2a and 2b, the outer circumferential surfaces of the projections 3a and 3b, and other horizontal surfaces. The rubber layer 4 contains a vulcanizing agent, a vulcanization accelerator, a vulcanization acceleration aid, an anti-aging agent, a reinforcing agent, a retarder, a plasticizer, and a colorant as necessary, in the rubber component as a main component. It is a combination of agents. In particular, the thickness of the rubber layer 4 is about 5 to 50 mm, preferably about 10 to 30 mm.

  As the rubber component, for example, a diene rubber can be used. Examples of the diene rubber include natural rubber and synthetic rubber such as chloroprene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, butadiene rubber, isoprene rubber, butyl rubber, and halogenated butyl rubber. Examples of the vulcanizing agent include sulfur, organic peroxide, zinc white, and magnesia. Examples of the vulcanization acceleration aid include zinc white and stearic acid. Examples of the antioxidant include amine compounds such as phenyl-α-naphthylamine, N, N′-diphenyl-p-phenylenediamine, and N-phenyl-N′-isopropyl-p-phenylenediamine; 2,6-di- and phenolic compounds such as t-butyl-p-cresol and 4,4′-butylidenebis (3-methyl-6-t-butylphenol). Examples of the plasticizer include petroleum-based process oils, tars, pitches, natural fats and oils, animal and vegetable fats and oils, and synthetic plasticizers. Examples of the reinforcing agent include carbon black, silica, and white carbon.

  As the upper collar 2 and the lower collar 3, for example, a metal plate such as a steel plate, ceramics, a hard plastic plate, or the like can be used. The thickness t2 of the upper collar 2 should be about 10 to 150 mm, preferably about 20 to 100 mm, and the thickness t3 of the lower collar 3 should be about 10 to 150 mm, preferably about 20 to 100 mm. Good. The depth t4 of the recesses 2a and 2b should be about 5 to 100 mm, preferably about 15 to 50 mm, and the height t5 of the projections 3a and 3b should be about 5 to 100 mm, preferably 15 to 50 mm. It should be a degree.

  The upper rod 2 and the lower rod 3 can be produced by forming a concave portion and / or a convex portion in a material such as a steel plate using a known means such as cutting. Moreover, as another method of forming a convex part, the method of joining separately the material used as a convex part to materials, such as a steel plate, using means, such as welding, for example.

Each of the inner peripheral surface of the first recess 2a and the inner peripheral surface of the second recess 2b in the upper collar 2 is composed of a sloped inclined wall surface 21. Furthermore, a protruding portion 5 that protrudes in the horizontal direction is formed on the inclined opening edge of the recesses 2a and 2b.
On the other hand, the outer peripheral surface of the first convex portion 3a and the inner and outer peripheral surfaces of the second convex portion 3b in the lower collar 3 are both formed by inclined inclined wall surfaces 31. Furthermore, the protrusion part 6 which protrudes in a horizontal direction is formed in the top part which these convex parts 3a and 3b inclined.

  The opposing inclined wall surface 21 and inclined wall surface 31 preferably have the same inclination angle. The inclination angle is not particularly limited, but may be about 40 ° to 80 °, preferably about 50 ° to 70 ° with respect to the vertical line. If the inclination angle is smaller than this range, the effect of increasing the load bearing area against the force in the horizontal direction may not be expected as much as compared to the vertical wall surface. Moreover, when the inclination angle exceeds the above range, there is a possibility that the load supporting performance against the force in the horizontal direction may be hindered.

  Since the peripheral surfaces of the concave portions 2a and 2b and the peripheral surfaces of the convex portions 3a and 3b are formed by inclined wall surfaces as described above, the load support area for the horizontal force acting on the concave portions 2a and 2b and the convex portions 3a and 3b is increased. Increased compared to the vertical plane. Therefore, the fitting length L between the concave portions 2a and 2b and the convex portions 3a and 3b shown in FIG. 2 can be reduced.

  It is preferable that the protrusions 5 and 6 protrude about 3 to 5 mm in the horizontal direction. The protrusions 5 and 6 are preferably formed on the entire peripheries of the tops of the protrusions 3a and 3b and the opening edges of the recesses 2a and 2b, respectively. The protrusions 5 and 6 may be formed at intervals. Further, the projections 5 and 6 are preferably formed at the tops of the projections 3a and 3b and the opening edges of the recesses 2a and 2b, but the projections 3a and 3b and the recesses 2a and 2b are opposed to each other. Any one of the surfaces (for example, a predetermined portion of the inclined wall surfaces 21 and 31 and the horizontal surface) may be used. Furthermore, only one of the protrusions 5 and 6 may be used.

  In the bearing device configured as described above, when a vertical load as indicated by an arrow M in FIG. 2 is applied, the rubber layer 4 swells in the direction indicated by the arrow N by that force. Thereby, a vertical load can be supported. However, since the recesses 2a and 2b and the protrusions 3a and 3b are formed with inclined wall surfaces, the rubber layer 4 is easily swelled. If the bulging amount of the rubber layer 4 is excessively increased, there is a concern that the distortion of the rubber layer 4 increases and the durability decreases. However, in the present embodiment, since the protrusions 5 and 6 are formed in the protrusions 3a and 3b and the recesses 2a and 2b, respectively, the protrusions 5 and 6 prevent the rubber layer 4 from excessively bulging. Can be suppressed.

On the other hand, the concave portions 2a, 2b and the convex portions 3a, 3b have a circumferential surface formed by an inclined wall surface, so that the fitting length L of the convex portions 3a, 3b and the concave portions 2a, 2b (see FIG. 2). If the force is small, the upper rod 12 and the lower rod 13 are likely to deviate from each other when a force is applied in the horizontal direction. However, in this embodiment, since the protrusions 5 and 6 are formed on the protrusions 3a and 3b and the recesses 2a and 2b, respectively, it is possible to suppress the upper hook 12 and the lower hook 13 from deviating from each other. Can do. In other words, since the protrusions 5 and 6 prevent the upper collar 12 and the lower collar 13 from deviating from each other, the fitting length L of the convex portions 3a and 3b and the concave portions 2a and 2b is reduced. This makes it possible to reduce the thickness and size of the support device.
That is, the fitting length L between the concave portions 2a and 2b and the convex portions 3a and 3b is 1 to 50 mm, preferably 1 to 20 mm.

  The rubber bearing device 1 as described above includes, for example, a rubber composition in which an upper rod 2 and a lower rod 3 are arranged at predetermined intervals in a mold, and various compounding agents are blended with a rubber component in the mold. Can be manufactured by injecting by injection or the like and integrally vulcanizing and bonding simultaneously with vulcanization molding.

  As another method for producing the rubber bearing device 1, a rubber composition having various compounding agents blended with a rubber component is molded by extrusion molding or the like to prepare a rubber layer having a predetermined thickness in advance. Examples thereof include a method of laminating the rubber layer, the upper collar 2 and the lower collar 3 and bonding them with an adhesive or the like. Examples of the adhesive include thermoplastic adhesives such as vinyl acetate, acrylic, ethylene copolymer, dope cement, monomer cement, polyamide, polyester, and polyurethane; chloroprene rubber, nitrile rubber, recycled rubber, styrene- Examples thereof include rubber adhesives such as butadiene rubber (SBR) and natural rubber.

  In the rubber bearing device 1 shown in FIGS. 1 and 2, the concave portions 2a and 2b having the inclined wall surfaces 21 and 31 and the convex portions 3a and 3b are formed in a substantially trapezoidal shape. The part is not limited to a substantially trapezoidal shape. That is, as shown in FIG. 3, the same effect can be obtained even with the inverted trapezoidal concave portions 2a ′ and 2b ′ and the convex portions 3a ′ and 3b ′. The recesses 2a ', 2b' and the projections 3a ', 3b' are such that the inclinations of the recesses 2a, 2b and the projections 3a, 3b and the inclined wall surfaces 21 ', 31' are reversed via vertical lines. Yes.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to the above embodiment, A various improvement and change are possible within the range as described in a claim. For example, in place of the rubber layer 4, other elastic materials such as a thermoplastic resin and a thermoplastic elastomer may be used. Examples of the thermoplastic resin include polyethylene, polypropylene, polyvinyl chloride, ABS resin, acrylic resin, polystyrene, polycarbonate, nylon, polyacetal, polyethylene terephthalate, polyvinylidene chloride, fluororesin, and polybutadiene. Examples of the thermoplastic elastomer (TPE) include polystyrene-based TPE, poroolefin-based TPE, polyvinyl chloride-based TPE, polyurethane-based TPE (TPU), polyester-based TPE, and polyamide-based TPE.

  Moreover, the elastic support body of this invention is applicable also to various structures, such as a building and machinery other than for bridge | bridging. For example, a building elastic support body includes an upper frame fixed to a building that is an upper structure, a lower frame fixed to a foundation that is a lower structure, and an elastic layer disposed therebetween. . The elastic support body for machines includes an upper frame fixed to a machine that is an upper structure, a lower frame fixed to a foundation that is a lower structure, and an elastic layer disposed therebetween.

It is sectional drawing which shows the support apparatus concerning one Embodiment of this invention. It is a partially expanded sectional view of the support apparatus shown in FIG. It is sectional drawing which shows the support apparatus concerning other embodiment of this invention. It is a partially broken perspective sectional view showing a conventional bearing device. It is sectional drawing of the conventional bearing apparatus.

Explanation of symbols

1 ... Rubber bearing device 2 ... Upper frame (upper frame)
2a, 2b ... recess 3 ... lower arm (lower frame)
3a, 3b ... convex part 4 ... rubber layer (elastic layer)
5 ... Projection 6 ... Projection 21 ... Inclined wall surface 31 ... Inclined wall surface

Claims (2)

An upper frame fixed to the upper structure, a lower frame fixed to the lower structure, and an elastic layer disposed between the upper frame and the upper frame are provided on a surface facing the lower frame. Concave portions and / or convex portions are formed, and the lower frame has a convex portion that fits into the lower frame on a surface facing the upper frame and at a position corresponding to the concave and / or convex portions of the upper frame, and And / or a structure support device in which a recess is formed, and the upper frame and the lower frame are fitted via the elastic layer to form a fitting portion,
A protrusion is formed on at least one of the surfaces where the protrusion and the recess face each other,
The said convex part and recessed part which mutually fit have an inclined wall surface, The bearing apparatus characterized by the above-mentioned. 2. The support device according to claim 1 , wherein the protrusion is formed on at least one of a top portion of the convex portion and an opening edge portion of the concave portion and projects in a horizontal direction.

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