JP2003184951A - Method of manufacturing rubber support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that adhesive flow is caused along with rubber flow in outer peripheral end when a rubber support elastically supporting an upper structure in a bridge or the like is vulcanized and formed and in which adhesive force between a rubber layer at the outer peripheral end and a steel plate deteriorates. <P>SOLUTION: In method of manufacturing the rubber support, each of rubber layer 16A, an upper steel plate 12, a lower steel plate 14 and an inner steel plate 18 is integrally vulcanized and formed with each other in binding state, by vertically compressing and heating a laminating body 10A alternately vertically laminating the upper steel plate 12, the lower steel plate 14, the inner steel plate 18 and the a non-vulcanized rubber layer 16A by means of a molding mold 24. Void 36 which enables the non-vulcanized rubber layer 16A to arise the rubber flow from the outer peripheral end to center side is provided in advance when molded by the molding mold 24. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a rubber bearing for elastically supporting an upper structure such as a concrete structure or a bridge.

[0002]

2. Description of the Related Art Conventionally, in a concrete structure, a bridge or the like, a rubber bearing is provided at a contact point between a lower structure and an upper structure, and the upper structure is elastically supported by the lower structure via the rubber bearing. Is being done. Figure 5
Shows the case of a bridge, 200A, 200 in the figure
B represents a pier and abutment, respectively, and 204 represents a bridge girder, and 206 represents a rubber bearing interposed between the lower structure including the piers 200A and abutments 200B and the upper structure including the bridge girder 204. ing.

For example, in a bridge, the upper structure expands and contracts due to various factors such as load application, temperature change, creep of concrete, and prestressing force, and after installation, the upper structure contracts due to drying. Therefore, by providing a rubber bearing at the contact point between the lower structure and the upper structure in this way,
The elastic deformation of the rubber can absorb the horizontal relative displacement between the lower structure and the upper structure.

Alternatively, in the event of an earthquake, the lower structure vibrates greatly in the horizontal direction, and therefore the rubber bearing 206 is provided, and the rubber bearing 206 is provided with a seismic isolation function, so that the elasticity of the rubber is increased. A large horizontal displacement can be absorbed by the deformation, and the vibration transmission can be blocked or reduced by the rubber bearing 206.

In addition, the upper structure is bent due to the load, and the fulcrum part (contact part) causes a rotary motion. Therefore, by providing a rubber bearing at the contact point between the lower structure and the upper structure, it is possible to absorb the rotational movement of the rubber due to elastic deformation of the rubber. This point is the size of the load,
The same applies to the case where the upper structure is elastically supported by the lower structure through the rubber bearing in a concrete structure or the like, although there is a difference in the magnitude of displacement.

The rubber bearing 206 is conventionally manufactured by the method shown in FIG. In the figure, 208 is a molding die (mold) for the rubber bearing 206, which includes an upper plate 210 and a lower plate 212.
And a side plate 214. In this manufacturing method, the upper steel plate (rigid upper reinforcing plate) 21 that constitutes the rubber bearing 206 is used.
6, a lower steel plate (rigid lower reinforcing plate) 218 and a laminate 206A in which an unvulcanized rubber layer 220 and an inner steel plate (rigid inner reinforcing plate) 222 are alternately laminated between them, It is set in the recess 224 surrounded by the lower plate 212 and the side plate 214, and in that state, the upper plate 210 of the molding die 208 is pushed downward, that is, the molding die 208.
The upper plate 210 and the lower plate 212 in FIG. 2 are moved relative to each other in the up-and-down direction to apply a compressive force to the laminated body 206A and heat from the hot plates arranged above and below the upper plate 210 and the lower plate 2
12 through which the unvulcanized rubber layer 220 is fluidized to compression-mold the laminated body 206A and the unvulcanized rubber layer 220 is vulcanized by heating to manufacture the rubber bearing 206. It was

In the method of manufacturing the rubber bearing 206 by compression vulcanization molding, it is necessary to fill the molding space of the rubber layer 220 with the unvulcanized rubber without gaps during the molding by the molding die 208.

Therefore, the amount of rubber in the unvulcanized rubber layer 220 in the laminate 206A is usually set as an excess amount, and the excess amount of unvulcanized rubber is molded at the time of molding.
It is made to escape (overflow) to the outside through the overflow hole provided in 4 or the like.

[0009]

However, in such a case, the unvulcanized rubber layers 220 laminated one above the other.
Although the rubber flow is satisfactorily generated in the above, the rubber flow causes the adhesive applied to the rigid plates 216, 218, 222, etc., especially the adhesive at the outer peripheral end, to flow away, and as a result, after vulcanization. It was found that in the rubber bearing 206, the adhesive force between the rubber layer 220 and the rigid plates 216, 218, 222 and the like is reduced at the outer peripheral ends.

In the case of the rubber bearing 206, the rubber bearing 206 is largely sheared and deformed when absorbing the displacement of the upper structure, and at that time, the rigid plates 216, 218, 222, etc. and the rubber layer 2 are subjected.
A large stress acts intensively on the bonded portion of the outer peripheral end with 20. That is, in the rubber bearing 206, the rigid plates 216, 21
The adhesive force of the outer peripheral end between the rubber layer 220 and 8, 222 or the like is
This is an important part that influences the strength of the rubber bearing 206, and if the adhesive strength of that part is weak, the strength of the rubber bearing 206 itself becomes low.

[0011]

The method for manufacturing a rubber bearing according to the present invention has been devised to solve such a problem.

Thus, in the manufacturing method of claim 1, a laminated body in which a rigid reinforcing plate and an unvulcanized rubber layer are alternately laminated on the upper and lower sides is compressed and heated in a vertical direction by a molding die, A method for manufacturing a rubber bearing in which a rubber layer and a reinforcing plate are integrally vulcanized and molded in a fixed state to each other, wherein a rubber flow from an outer peripheral end portion to a center side is applied to the unvulcanized rubber layer during molding by the molding die. The feature is that a vacant space is created in advance.

A manufacturing method according to a second aspect is characterized in that, in the first aspect, the void is provided in a horizontal central portion of the unvulcanized rubber layer.

A manufacturing method according to a third aspect is characterized in that, in any one of the first and second aspects, the void is provided so as to vertically penetrate the unvulcanized rubber layer.

The manufacturing method of claim 4 is characterized in that, in any one of claims 1 to 3, the reinforcing plate is provided with a through hole communicating with the void.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the molding die is one in which an overflow hole for overflowing excess rubber to the outside is not provided in a side plate of the molding die. It is characterized by

[0017]

As described above, according to the present invention, the unvulcanized rubber layer in the laminate is preliminarily provided with a cavity for causing a rubber flow from the outer peripheral end to the center side during molding by the molding die. According to the present invention, the unvulcanized rubber layer causes a rubber flow mainly from the outer peripheral end toward the center side during molding, and the unvulcanized rubber flows from the outer peripheral end to the outside of the molding die. Therefore, it is possible to prevent the overflow of the adhesive on the outer peripheral end portion, which is applied to the reinforcing plate, from flowing together.

Therefore, according to the present invention, it is possible to increase the adhesive force of the outer peripheral end portion between the rubber layer and the reinforcing plate in the rubber bearing, and thereby the shear deformation capability of the rubber bearing can be greatly increased. That is, the strength of the rubber bearing can be effectively increased. In the present invention, the voids previously formed in the unvulcanized rubber layer can be filled with the rubber flow during molding.

In the present invention, it is desirable that the void be provided in the center of the unvulcanized rubber layer in the horizontal direction (claim 2). By doing so, it is possible to favorably induce rubber flow from the outer peripheral end toward the center during molding.

Further, this void can be provided in such a manner that it passes through the unvulcanized rubber layer in the vertical direction (claim 3).

In the present invention, the reinforcing plate may be provided with a through hole communicating with the void (claim 4). By doing so, an escape path for the air in the void when a rubber flow is generated toward the void can be secured by the through hole provided in the reinforcing plate, and thus from the outer peripheral end to the center side. The rubber flow can be more favorably induced.

In the present invention, it is possible to provide an overflow hole in the side plate of the molding die. However, it is desirable to perform vulcanization molding of the rubber bearing using a molding die in which such an overflow hole is not provided in the side plate (Claim 5). By doing so, the rubber flow from the outer peripheral edge to the center side can be more favorably induced, and the rubber escapes to the outside of the mold by passing through the outer peripheral edge, thereby adhering It is possible to more favorably solve the problem that the agent flows out together.

[0023]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes a rubber bearing, an upper steel plate 12 serving as a rigid upper reinforcing plate, a lower steel plate 14 serving as a rigid lower reinforcing plate, and a rubber layer 16 between them and an inner steel plate 18 serving as a rigid internal reinforcing plate. And are alternately laminated in a laminated state, and they are integrally fixed by vulcanization adhesion.

The rubber bearing 10 is provided with a side surface covering rubber layer 20 so as to cover the outer peripheral surface thereof. Further, the upper steel plate 12 and the lower steel plate 14 are each provided with a fitting recess 22 for fitting a shear key (not shown).

In this example, the rubber bearing 10 has, for example, a 1000 mm square planar shape, the upper steel plate 12 and the lower steel plate 14 have a thickness of 50 mm, the rubber layer 16 has a thickness of 39 mm, and the inner steel plate 18 has a thickness of 4.5 mm. is there. The side-faced rubber layer 20 has a thickness of 10 mm, that is, the thickness in the horizontal direction is 10 mm.
The size is mm. However, these dimensional relationships are merely examples.

FIG. 2 shows a method of manufacturing the rubber bearing 10. In the figure, reference numeral 24 designates a molding die (mold) for molding the rubber bearing 10, an upper plate 26, a lower plate 28 and a side plate 30.
It has a box shape as a whole. In this example, the side plate 30 of the molding die 24 is not provided with an overflow hole.

In the manufacturing method of the present embodiment, the unvulcanized rubber layer 16A and the interior of the rubber layer 16A between the upper steel plate 12 and the lower steel plate 14 are formed in the recess 32 surrounded by the lower plate 28 and the side plate 30 in the molding die 24. Laminated body 10 in which a plurality of steel plates 18 are alternately laminated
Set A. It should be noted that the upper plate 26 and the lower plate 28 are each provided with a projection 34 that fits into the fitting recess 22.

In this example, a void (here, a void having a circular cross section) 36 that penetrates vertically is provided in each of the central portions of the unvulcanized rubber layer 16A in the laminate 10A (for example, the diameter). 20 to 80 mm). On the other hand, the upper steel plate 12,
The lower steel plate 14 and the inner steel plate 18 are also provided with through holes 38 having a smaller shape and a smaller size than the space 36 at corresponding positions. Adhesives have been previously applied to both surfaces of each internal steel plate 18, the lower surface of the upper steel plate 12, and the upper surface of the lower steel plate 14.

In the manufacturing method of this embodiment, with the laminated body 10A set in the recess 32 of the molding die 24 as described above, the upper plate 26 of the molding die 24 is pushed downward and heat from the hot platen is heated. Each unvulcanized rubber layer 16A in the laminate 10A is caused to flow through and is compression-molded into a predetermined shape. FIG. 2 (II) shows the state at this time. At this time, as shown in the same figure, since each unvulcanized rubber layer 16A in the laminated body 10A is provided with a void 36 in each of its central portions, the outer peripheral end portion to the central portion A rubber flow is caused toward the void 36 and finally the void 36 is filled with rubber.

At this time, in each of the upper steel plate 12, the lower steel plate 14 and the inner steel plate 18, at the central portion thereof, specifically, in the peripheral portion of the cavity 36 and the through hole 38, each steel sheet is caused by the rubber flow toward the central cavity 36. There is a possibility that the adhesive that has been previously adhered (coated) to 12, 14, and 18 may partially flow together due to the rubber flow, but even if such a phenomenon occurs, the rubber bearing 10 Is Figure 1
When a large amount of shear deformation is applied in the middle and left and right directions, stress concentration does not occur so much in the central portion, so that it does not significantly affect the strength of the rubber bearing 10 during shear deformation.

Now, the unvulcanized rubber layer 16 is heated by heating the laminate 10A for a predetermined time in the mold clamped state shown in FIG. 2 (II).
The vulcanization of A progressed, and along with this, each steel plate 12, 1
The rubber layer 1 is formed by the action of the adhesive agent applied to 4, 18
6 and the steel plates 12, 14, and 18 are vulcanized and bonded. Figure 2
(III) represents the rubber bearing 10 thus obtained.

In the case of the method of manufacturing the rubber bearing 10 of this example, a rubber flow mainly from the outer peripheral end portion to the center side is generated at the time of molding, and the rubber flow flows out of the molding die 24 from the center side to the outer peripheral end portion. Since this is suppressed, it is possible to increase the adhesive force between the rubber layer 16 of the rubber bearing 10 and the outer peripheral end portions of the steel plates 12, 14, and 18. As a result, the shear deformation capability of the rubber bearing 10, that is, the strength of the rubber bearing 10 can be effectively increased.

Then, the void 36 is filled with the unvulcanized rubber layer 16
Since it is provided just at the center in the horizontal direction of A, the rubber flow from the outer peripheral end to the center can be satisfactorily induced.

A vacant space 36 is formed on each of the steel plates 12, 14 and 18.
Since the through hole 38 that communicates with the space 36 is provided, it is possible to secure an escape path for the air in the space 36 when a rubber flow is generated toward the space 36, and thus, from the outer peripheral end to the center side. The rubber flow can be more favorably induced.

Further, in this example, since the molding die 24 having no overflow hole in the side plate 30 is used, the rubber flow from the outer peripheral end portion to the center side can be further satisfactorily induced, and a part of the rubber is removed. By passing through the outer peripheral edge and escaping to the outside of the molding die 24, the problem of the adhesive flowing away can be solved more satisfactorily.

Since the through hole 38 is mainly used as an air vent hole, the space 36 formed in the unvulcanized rubber layer 16A and the through holes provided in the steel plates 12, 14 and 18 as in the above example. Although the holes 38 may have different sizes, as shown in FIG. 3, the through holes 38 in each of the steel plates 18 are formed in the voids 3 in the unvulcanized rubber layer 16A.
6 can be provided with the same size and shape.

On the other hand, FIG. 4 shows another example of the shape of the void 36 in the unvulcanized rubber layer 16A, of which FIG.
(A) is an example in which the void 36 is provided only on one of the upper and lower surfaces of the unvulcanized rubber layer 16A and in a non-penetrating form. On the other hand, the example of FIG. 4 (B) is an example in which voids 36 are provided on the upper surface and the lower surface of the unvulcanized rubber layer 16A and in a non-penetrating form.

In the present invention, the void 36 in the unvulcanized rubber layer 16A can be provided in various forms. Further, in each of the above embodiments, the void 36 is provided at the exact center position of the unvulcanized rubber layer 16A, but in some cases it is possible to provide a single or a plurality at a position horizontally displaced from the central position. is there.

Furthermore, in the above example, the side plate 30 of the molding die 24 is not provided with the overflow hole for allowing the excess rubber to escape, but in some cases, the side plate 30 may be provided with such an overflow hole. For example, the present invention can be implemented in variously modified modes without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a rubber bearing obtained by a method according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an embodiment method of the present invention.

FIG. 3 is an explanatory diagram of another embodiment of the present invention.

FIG. 4 is an explanatory diagram of still another embodiment of the present invention.

FIG. 5 is an explanatory view showing a state in which a bridge is elastically supported by using a rubber bearing.

FIG. 6 is an explanatory diagram of an example of a conventional method of manufacturing a rubber bearing.

[Explanation of symbols]

10 rubber bearings 10A laminated body 12 Upper steel plate (reinforcing plate) 14 Lower steel plate (reinforcing plate) 16,16A rubber layer 18 Internal steel plate (reinforcing plate) 24 Mold 30 side plate 36 vacant places 38 through hole

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2D059 AA37 GG01                 3J048 AA01 AD05 BA08 DA01 EA38                 3J059 AD04 BA43 EA03 GA42                 4F100 AB03A AN00B AT00A EG00                       EJ06 EJ20 EJ42 GB07 JH02                       JK01A                 4F203 AA45 AD03 AG03 AH47 AM32                       DA11 DB01 DB11 DC01 DJ29                       DL10

Claims (5)

[Claims] 1. A laminated body in which a rigid reinforcing plate and an unvulcanized rubber layer are alternately laminated vertically is compressed and heated in a vertical direction by a molding die to fix each rubber layer and the reinforcing plate to each other. A method of manufacturing a rubber bearing that is integrally vulcanized and molded, wherein an unvulcanized rubber layer is preliminarily provided with a cavity that causes a rubber flow from an outer peripheral end to a center side when molding by the molding die. A method for manufacturing a rubber bearing characterized by: 2. The method of manufacturing a rubber bearing according to claim 1, wherein the void is provided in a horizontal center of the unvulcanized rubber layer. 3. The method of manufacturing a rubber bearing according to claim 1, wherein the void is provided in a form that vertically penetrates the unvulcanized rubber layer. 4. The method of manufacturing a rubber bearing according to claim 1, wherein the reinforcing plate is provided with a through hole communicating with the void. 5. The rubber according to claim 1, wherein the molding die is not provided with an overflow hole for overflowing excess rubber to the outside, in a side plate of the molding die. Manufacturing method of bearing.