JP5333099B2 - Laminated rubber bearing - Google Patents

Description

  The present invention relates to a laminated rubber bearing, and more particularly relates to a laminated rubber bearing that has good appearance and excellent weather resistance and is easy to maintain.

  As a seismic isolation device or a support device for a structure such as a building or a bridge, a laminated rubber bearing in which plates are attached to the upper and lower sides of a laminated body in which a plurality of steel plates and rubber plates are laminated is used. In general, since buildings and bridges have been used for several decades, laminated rubber bearings are also required to have durability corresponding to them. However, the outer peripheral surface of the rubber plate that constitutes the laminate is deteriorated by ozone or sunlight contained in the atmosphere, especially when used outdoors. Therefore, a protective rubber layer is provided on the outer periphery of the laminate. Thus, the weather resistance has been improved conventionally.

  However, when a protective rubber layer is provided on the outer periphery of the laminate as described above, if damage such as ozone cracks is observed on the surface of the rubber layer, it is determined whether or not the internal rubber plate is damaged. Since it could not be confirmed, there was a problem that the laminated rubber support itself had to be replaced to ensure safety.

  In order to solve such a problem, Patent Document 1 proposes a laminated rubber bearing body in which a protective layer mainly composed of a rubber sheet is detachably wound around the outer circumference of the laminated body after vulcanization adhesion.

  However, the laminated rubber bearing body of Patent Document 1 has a problem in that maintenance is troublesome because the entire protective layer must be replaced when damage is found in the protective layer. In addition, since the end portions of the rubber sheet are overlapped with each other, there is a problem that the appearance of the laminated rubber support body is deteriorated.

JP 2008-215486 A

  An object of the present invention is to provide a laminated rubber bearing body that has good appearance and excellent weather resistance and is easy to maintain.

  The laminated rubber bearing body of the present invention that achieves the above object is a laminated rubber bearing body in which plates are attached to both ends of a laminated body in which a plurality of steel plates and rubber plates are alternately laminated in the vertical direction. A covering rubber layer is provided on at least a part of the outer peripheral surface of the protective rubber layer, and a plurality of protective rubber layers are laminated on the outer periphery of the covering rubber layer in an easily peelable state.

  It is desirable to arrange an adhesive portion and a non-adhesive portion on the joint surface between the covering rubber layer and the innermost protective rubber layer and the joint surface between the plurality of protective rubber layers. Further, it is preferable that the bonded portion and the non-bonded portion on the adjacent bonding surfaces do not overlap with the same portion in the radial direction. Furthermore, it is desirable to color the plurality of protective rubber layers with different colors.

  The laminated rubber bearing of the present invention is suitably used as a support device for bridges.

  According to the laminated rubber bearing of the present invention, the covering rubber layer is provided on the outer peripheral surface of the laminated body, and a plurality of protective rubber layers are laminated in an easily peelable state on the outer periphery of the covering rubber layer. The outer peripheral surface of the rubber plate of the support body is protected by the covering rubber layer and the plurality of protective rubber layers to improve the weather resistance of the support body, and when the protective rubber layer is damaged by ozone cracks, Since only the damaged protective rubber layer needs to be peeled off, maintenance can be facilitated. In addition, since the end portions of the protective rubber layer do not overlap each other, the appearance of the support body is not impaired.

It is sectional drawing of the laminated rubber bearing body which consists of embodiment of this invention. It is an expanded sectional view of the X section in FIG. It is an external view which shows arrangement | positioning of the adhesion part in the joint surface of a protective rubber layer, Comprising: (a) shows a staggered pattern, (b) shows a striped horse-shaped pattern, respectively. It is sectional drawing of the laminated rubber bearing body which consists of another embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a laminated rubber bearing body according to an embodiment of the present invention.

  This laminated rubber bearing body (hereinafter simply referred to as “bearing body”) comprises a laminated body 3 in which a plurality of steel plates 1 and rubber plates 2 are alternately laminated in the vertical direction, and the upper and lower ends of the laminated body 3. Further, an upper plate 4 and a lower plate 5 are attached respectively. When installing the support body, the upper plate 3 is connected and fixed to a structure such as a building or a bridge, and the lower plate 4 is connected and fixed to a ground or an abutment. A through hole may be formed in the central area of the laminate 3 and a lead plug may be installed therein.

  In such a support body, as shown in FIG. 2, a thick coating rubber layer 6 is provided on the outer peripheral surface of the laminated body 3, and a plurality of thin protective layers are provided on the outer periphery of the coating rubber layer 6. Rubber layers 7 (three layers in this example) are laminated. The covering rubber layer 6 is firmly vulcanized and bonded to the laminate 3, while the protective rubber layer 7 is vulcanized and bonded in an easily peelable state.

  The material of the covering rubber layer 6 and the protective rubber layer 7 is not particularly limited, but the covering rubber layer 6 is composed of the same rubber composition as that of the rubber plate 2 in order to firmly vulcanize and bond to the laminate 3. On the other hand, the protective rubber layer 7 is preferably made of a rubber composition different from the coated rubber layer 6 so that the innermost protective rubber layer 7a can be easily peeled off from the coated rubber layer 6. Further, the thickness and the number of layers of the covering rubber layer 6 and the protective rubber layer 7 are not particularly limited, but the thickness of the protective rubber layer 7 needs to be thinner than that of the covering rubber layer 6. Furthermore, it is preferable that the thicknesses of the plurality of protective rubber layers 7 are all the same in order to reduce the manufacturing cost. The total thickness of the covering rubber layer 6 and the protective rubber layer 7 is preferably about 10 mm. For example, the protective rubber layer 7 having a thickness of 2 mm is provided on the outer periphery of the covering rubber layer 6 having a thickness of 5 mm. A configuration in which three layers are stacked is exemplified.

  By constituting the support body in this way, the outer peripheral surface of the rubber plate 2 of the support body is protected by the covering rubber layer 6 and the plurality of protective rubber layers 7, and the weather resistance of the support body is improved, and the protection is provided. When the rubber layer 7 is damaged by ozone cracks or the like, it is only necessary to peel off the damaged protective rubber layer 7, so that maintenance can be facilitated. Further, since the end portions of the protective rubber layer 7 are not overlapped with each other, the appearance of the support body is not impaired. Furthermore, since there are a plurality of protective rubber layers 7, even if damage such as ozone cracks occurs in the protective rubber layer 7, it is possible to prevent the progress to the inside from the joint surface 8. Life can be extended.

  In addition, it is not always necessary to peel the damaged protective rubber layer 7, and only a damaged part such as an ozone crack may be cut off and peeled off.

  The manufacturing method of said support body is demonstrated below.

  First, the laminated body 3 is comprised by laminating | stacking the some steel plate 1 and the rubber plate 2 alternately by the up-down direction. Next, the covering rubber layer 6 is provided on the outer peripheral surface of the laminate 3. Then, a plurality of protective rubber layers 7 are sequentially laminated on the outer periphery of the covering rubber layer 6. An adhesive portion 9 and a non-adhesive portion 10 are formed on the bonding surface 8 between the covering rubber layer 6 and the innermost protective rubber layer 7a and the bonding surface 8 between the protective rubber layers 7, and the protective rubber Make the layer 7 easily peelable. The bonding portion 9 and the non-bonding portion 10 are preferably arranged on the bonding surface 8 so as to be alternated. For example, a staggered pattern as shown in FIG. 3A or a striped horse shape as shown in FIG. Is exemplified. This non-adhesion part 10 can be comprised by apply | coating a release agent to the joining surface 8, or sticking release papers, such as a polyester film. After the laminated body 3 configured as described above is integrally vulcanized, the upper plate 4 and the lower plate 5 are attached to manufacture a support body.

  It is desirable that the positions of the bonding portion 9 and the non-bonding portion 10 are not overlapped with each other between the adjacent bonding surfaces 8 in the radial direction. By doing so, it becomes easy to peel the protective rubber layer 7 one by one.

  The plurality of protective rubber layers 7 are preferably colored with different colors. By doing so, since the number and state of the peeled protective rubber layers 7 can be easily known, the maintenance of the support body is facilitated.

  FIG. 4 shows a support body according to another embodiment of the present invention.

  This support body is obtained by laminating a plurality of protective rubber layers 7 on a part of the upper side and the lower side of the laminated body 3. Generally, in a support body, stress concentrates on the upper part and the lower part of the laminated body 3, so that those parts are particularly susceptible to damage such as cracks. As described above, since the protective rubber layer 7 is laminated only on the parts that are easily damaged, the manufacturing cost can be reduced and the maintenance can be further facilitated as compared with the support body of the above embodiment. .

  The support body of the present invention can be suitably used for a support body used outdoors, such as a bridge support device.

DESCRIPTION OF SYMBOLS 1 Steel plate 2 Rubber plate 3 Laminated body 4 Upper plate 5 Lower plate 6 Covering rubber layer 7 Protective rubber layer 8 Joining surface 9 Adhesion part 10 Non-adhesion part

Claims (5)

In the laminated rubber bearing body in which plates are attached to both ends of a laminated body obtained by alternately laminating a plurality of steel plates and rubber plates in the vertical direction,
A laminated rubber bearing body in which a coated rubber layer is provided on the outer circumferential surface of the laminated body, and a plurality of protective rubber layers are laminated in an easily peelable state on at least a part of the outer circumference of the coated rubber layer.   The laminated rubber bearing according to claim 1, wherein an adhesive portion and a non-adhesive portion are disposed on a joint surface between the covering rubber layer and the innermost protective rubber layer and a joint surface between the plurality of protective rubber layers. body.   The laminated rubber bearing body according to claim 1 or 2, wherein the bonded portion and the non-bonded portion in the adjacent joint surfaces do not overlap with the same portion in the radial direction.   The laminated rubber bearing body according to any one of claims 1 to 3, wherein the plurality of protective rubber layers are colored with different colors.   The laminated rubber bearing body according to any one of claims 1 to 4, which is a support device for a bridge.

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