JPH06229142A - Laminated rubber bearing body - Google Patents

Abstract

PURPOSE:To moderate the stress concentration of an outer peripheral part of a rubber-shaped elastic board and restrain a hardening phenomenon of a laminated rubber-made bearing body as a result. CONSTITUTION:In terms of a laminated rubber bearing body which comprises a rigid board 1 and a rubber-shaped elastic board 2 alternately laminated and loads and supports a structure or a weight horizontally and swingably, an elastmer sheet 3, whose both surfaces are coated with an adhesive, is laid out between the rubber-shaped elastic board 2 and the rigid board 1. At least as for one side of the elastic board 2, only its central part is bonded with the rigid board 1 while the outer peripheral part of the elastic board 2 and the rigid board 1 are not bonded with each other and the other side of the elastic board 2 is coupled with the rigid board 1 with an adhesive. Otherwise, at least as for one side of the elastic board 2, its adhesion in the outer peripheral part is lowered compared with the adhesion in the central part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated rubber bearing used as a seismic isolation device for buildings and heavy objects.

[0002]

2. Description of the Related Art Conventionally, laminated rubber bearings shown in FIGS. 12 and 13 have been put into practical use as a device for protecting buildings and heavy objects from earthquakes or vibrations. This is one in which a rubber-like elastic plate 2 such as natural rubber or synthetic rubber and a rigid plate 1 such as a steel plate are alternately laminated, and a mounting plate 4 is fixed to the upper and lower elastic plates 2. Then, as shown in FIG. 14, it is used as a cushioning material for supporting a building or heavy object 5 or the like so as to insulate it from the foundation 6. When the laminated rubber bearing 7 receives a load from above, the rubber-like elastic plate 2 tends to be deformed outward from the center where the restraining force is smaller,
When the resulting force exceeds the restraining force between the rubber-like elastic plate 2 and the rigid plate 1, deformation due to displacement occurs. 15 and 16 show a case where the laminated rubber bearing is deformed in the horizontal direction. Along with this deformation, a shearing force or the like is generated between the rubber-like elastic plate 2 and the rigid plate 1, and when this exceeds the restraining force between the rubber-like elastic plate 2 and the rigid plate 1, the deformation due to the displacement is caused. Occurs. This shift needs to be minimized to the extent necessary for the application of the laminated rubber bearing. Conventionally, in the laminated rubber bearing 7, natural rubber or synthetic rubber is used as the rubber-like elastic plate 2 shown in FIGS. 12 and 13, and a steel plate or the like is used as the rigid plate 1.
In addition, as for the adhesion of the rigid plate 1 and the elastic plate 2, there are a method in which rubber and metal are superposed and adhered by vulcanization, such as a brass plating method, and an indirect method in which an adhesive is applied to a metal surface for adhesion. However, in general, when using vulcanization bonding,
Thermocompression bonding is required, and in order to ensure uniform adhesive performance, it is necessary to strictly control temperature uniformity, etc., which complicates the manufacturing equipment on a large scale and requires a considerable amount of time for manufacturing. Costly. Further, regarding the method of applying the adhesive to the metal surface, making the application amount uniform is a problem in ensuring quality. This control is becoming an increasingly important issue in the two-liquid bonding method, which has a higher adhesive strength. Even in the case of applying an adhesive, it is often necessary to perform thermocompression bonding in order to enhance and stabilize the performance of the adhesive. In this case, too, the manufacturing apparatus needs to be complicated on a large scale, which requires a considerable amount of time and cost for manufacturing. Further, as shown in FIG. 11, when the horizontal displacement δ of the rubber-like elastic plate exceeds a certain limit δs, the horizontal load Q associated therewith sharply increases, causing a so-called hardening phenomenon. That is, the horizontal rigidity value of the laminated rubber bearing increases rapidly, and as a result, the seismic isolation effect of the building or heavy object may be greatly affected.

[0003]

In the case of manufacturing the laminated rubber bearing 7, stable quality, such as uniformization of the adhesive film thickness by improving the method of adhering the rigid plate 1 and the rubber-like elastic plate 2, is obtained. Securing and simplification of manufacturing process are issues. Further, when joining the rigid plate 1 and the rubber-like elastic plate 2 having different properties, it is a problem to improve the quality of the laminated rubber bearing 7 by using an appropriate adhesive on each bonding surface. Furthermore, the "horizontal resilience-displacement" characteristic of the laminated rubber bearing 7 differs depending on the shape or area of the bonding surface between the rigid plate 1 and the rubber-like elastic plate 2. By utilizing this phenomenon to change the shape or adhesive strength of the adhesive surface, it is an object to keep the performance during horizontal deformation of the laminated rubber bearing 7 linear and suppress the hardening phenomenon.

[0004]

In order to advantageously solve the above-mentioned problems, the laminated rubber bearing of the present invention comprises a rigid plate 1 and rubber-like elastic plates 2 alternately laminated, In a laminated rubber bearing for supporting a structure or a heavy object so that it can swing horizontally, a rubber-like elastic plate 2 and a rigid plate 1 are used.
Elastomer sheet 3 with adhesive applied to both sides
And at least one surface of the elastic plate 2 is
Only the central portion is adhered to the rigid plate 1, the outer peripheral portion of the elastic plate 2 and the rigid plate 1 are made non-adhesive, and the other surface of the elastic plate 2 and the rigid plate 1 are bonded by an adhesive. Further, in the laminated rubber bearing body configured by alternately stacking the rigid plates 1 and the rubber-like elastic plates 2 to support a building or a heavy object so as to be horizontally swingable, the rubber-like elastic plate 2 is used. Between the rigid plate 1 and the rigid plate 1, an elastomer sheet 3 having both surfaces coated with an adhesive is disposed, and at least one surface of the elastic plate 2 has a lower adhesive strength at the outer peripheral portion than the adhesive strength at the central portion. Also, the above-mentioned problems can be solved advantageously.

[0005]

1 to 4 show an embodiment of the invention of claim 1, in which a large number of rubber-like elastic plates 2 made of natural rubber or synthetic rubber and rigid plates 1 alternate in the vertical direction. Steel mounting plates 4 are disposed on the upper and lower portions of the upper and lower elastic plates 2, and both sides of each elastic plate 2 and both sides of the synthetic resin sheet are interposed between the rigid plate 1 and the mounting plate 4. An elastomer sheet 3 formed by applying an adhesive to the elastic plate 2 is disposed on one surface of each elastic plate 2, and the elastomer sheet 3 has a contour and an area substantially equal to those of the elastic plate 2. The elastomer sheet 3 arranged on the opposite surface of the plate 2 has a contour and an area smaller than the contour of the elastic plate 2, and each rigid plate 1, each elastic plate 2, each elastomer sheet 3 and each mounting plate. 4 and 4 are compressed to form a laminated rubber bearing 7, The outer peripheral portion of the opposite side of the serial elastic plate 2 has a non-adhesive state.

FIG. 5 shows a state in which a laminated rubber bearing 7 interposed between a foundation 6 and a building or heavy object 5 arranged above the foundation 6 is sheared and deformed. The plate 4 is fixed to the foundation 6 with bolts (not shown), the upper mounting plate 4 is fixed to the elastomer sheet 3 with bolts (not shown), and the elastic plate 2 is sheared and deformed. At the same time, the upper surface or the lower surface of the outer peripheral portion of the elastic plate 2 is separated from the upper surface or the lower surface of the rigid plate 1 and the mounting plate 4.

As a result, as shown by the alternate long and short dash line in FIG. 11, stress concentration is alleviated and the hardening of the laminated rubber bearing 7 is also alleviated.

6 to 10 show an embodiment of the invention of claim 2, wherein a large number of rubber-like elastic plates 2 made of natural rubber or synthetic rubber and rigid plates 1 are alternately arranged in the vertical direction. The upper and lower elastic plates 2 arranged above and below,
A steel mounting plate 4 is arranged, and an elastomer sheet 3 formed by applying an adhesive agent to both surfaces of a synthetic resin sheet is arranged between both sides of each elastic plate 2 and the rigid plate 1 and the mounting plate 4, Further, the elastomer sheets 3 arranged on both sides of each elastic plate 2 have a contour and an area which are substantially equal to those of the elastic plate 2.

The adhesive of the elastomer sheet 3 (3A) arranged on one side of the elastic plate 2 has strong adhesive strength over the entire surface, and the elastomer sheet 3 ((3A) arranged on the opposite side of the elastic plate 2 ( In 3B), an adhesive having a high adhesive strength is used as the central adhesive, and an adhesive having a low adhesive strength is used as the peripheral adhesive. The rigid plate 1, the elastic plate 2, the elastomer sheet 3, and the mounting plate 4 are compressed to form the laminated rubber bearing 7.
The method of using the laminated rubber bearing 7 is the same as that of the embodiment of the invention of claim 1.

[0010]

According to the present invention, a laminated rubber which is constructed by alternately laminating rigid plates 1 and rubber-like elastic plates 2 and horizontally supports a building or a heavy object so that the structure or the heavy object can be rocked horizontally. In the support, an elastomer sheet 3 having both surfaces coated with an adhesive is arranged between a rubber-like elastic plate 2 and a rigid plate 1, and at least one surface of the elastic plate 2 has a rigid plate 1 only at the center. To the outer peripheral portion of the elastic plate 2 and the rigid plate 1.
Are made non-adhesive and the other surface of the elastic plate 2 and the rigid plate 1 are bonded by an adhesive, or the rigid plate 1 and the rubber-like elastic plate 2 are alternately laminated to form a structure. Alternatively, in a laminated rubber support for placing and supporting a heavy object so as to be swingable in the horizontal direction, an elastomer sheet 3 coated with an adhesive on both sides is arranged between a rubber-like elastic plate 2 and a rigid plate 1, Since at least one surface of the elastic plate 2 has a lower adhesive strength at the outer peripheral portion than the adhesive strength at the central portion, stress concentration at the outer peripheral portion of the elastic plate 2 is relaxed, and as a result, the hardened rubber bearing body is hardened. It is possible to obtain the effect of suppressing the phenomenon.

[Brief description of drawings]

FIG. 1 is a side view showing a laminated rubber bearing according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a vertical sectional side view showing a part of FIG. 1 in an enlarged manner.

FIG. 4 is a vertical sectional side view showing an exploded view of FIG.

FIG. 5 is a side view showing a state in which a laminated rubber bearing interposed between a foundation and a building or a heavy object is sheared and deformed.

FIG. 6 is a vertical cross-sectional side view showing a part of the laminated rubber bearing according to the embodiment of the invention of claim 2;

7 is a cross-sectional view taken along the line BB of FIG.

FIG. 8 is a vertical sectional side view showing a part of FIG. 6 in an enlarged manner.

FIG. 9 is a vertical cross-sectional side view of FIG. 6 in an exploded manner.

FIG. 10 is a vertical sectional side view showing a part of FIG. 9 in an enlarged manner.

FIG. 11 is a horizontal load-horizontal displacement characteristic diagram.

FIG. 12 is a side view showing a conventional laminated rubber bearing.

FIG. 13 is a plan view of a conventional laminated rubber bearing.

FIG. 14 is a side view showing a state in which a conventional laminated rubber bearing is interposed between a foundation and a building or heavy object.

FIG. 15 is a side view showing a state in which the laminated rubber support shown in FIG. 14 is sheared and deformed.

16 is a side view showing a part of FIG. 15 in an enlarged manner. FIG.

[Explanation of symbols]

 1 Rigid Plate 2 Elastic Plate 3 Elastomer Sheet 4 Mounting Plate 5 Building or Heavy 6 Foundation 7 Laminated Rubber Bearing

Claims (2)

[Claims] 1. A laminated rubber bearing which is constructed by alternately laminating a rigid plate 1 and a rubber-like elastic plate 2, and supports a building or a heavy object so as to be horizontally swingable. Between the elastic plate 2 and the rigid plate 1, an elastomer sheet 3 coated with an adhesive on both sides is arranged, and at least one surface of the elastic plate 2 is adhered to the rigid plate 1 only at the central portion, The outer peripheral portion of the elastic plate 2 and the rigid plate 1 are made non-bonded,
A laminated rubber bearing in which the other surface of the elastic plate 2 and the rigid plate 1 are joined together with an adhesive. 2. A laminated rubber bearing for supporting and supporting a building or a heavy object in a horizontally swingable manner, comprising a rigid plate 1 and a rubber-like elastic plate 2 alternately laminated to each other. Between the elastic plate 2 and the rigid plate 1, an elastomer sheet 3 coated with adhesive on both sides is arranged, and the adhesive strength at the outer peripheral portion of at least one surface of the elastic plate 2 is compared with the adhesive strength at the central portion. And lowered laminated rubber bearing.