JP2575204Y2 - Seismic isolation elastic rubber bearing for structures - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a seismic isolation rubber bearing for a structure having a function of elastically supporting a structure such as a bridge girder and a function of seismically isolating the structure against seismic force. It is about.

[0002]

2. Description of the Related Art Conventionally, as a rubber bearing for supporting a structure, as disclosed in Japanese Utility Model Publication No. 54-4285, a metal intermediate suppressing plate is embedded in an intermediate portion of an elastic rubber layer, and There is known a rubber bearing having a structure in which metal suppressing plates are fixed to upper and lower surfaces of an elastic rubber layer. Conventionally, Japanese Utility Model Application Laid-Open No. 61-39705 and Japanese Patent Application Laid-Open No.
There is also known a seismic isolation rubber bearing disclosed in the official gazette.

[0003]

In the case of the rubber bearing described above, the structure can be elastically supported by the elastic rubber layer. However, there is a problem that it does not have a function of damping the vibration of the structure when an earthquake occurs. is there. Further, in the case of the above-mentioned seismic isolation rubber bearing, a viscous rubber core is inserted into a vertical hole drilled at only one location in the center of the laminated rubber body. In order to improve the vibration-isolating effect, it is necessary to increase the core diameter or to connect a plurality of laminated rubber bodies. When the qualitative property is increased and a plurality of laminated rubber bodies are combined, there are disadvantages that the structure becomes more complicated and the production cost increases. Further, in the case of one structural example of the seismic isolation rubber bearing, similarly to the above, only a high-damping elastomer is inserted into one hole formed in the center of the restraining body which is a laminated rubber body. Therefore, when trying to improve the vibration damping effect of this high damping elastomer,
The same drawbacks as above occur. Other structural examples that can be said to be means for eliminating this drawback have been disclosed above. That is,
This structural example has a structure in which a high-attenuation elastomer is fitted concentrically at the center and the outer periphery, and a donut-shaped restraining body is inserted between the high-attenuation elastomers at the inner and outer periphery. In the case of this example, the vibration damping effect can be expected to be improved by the high damping elastomer. However, if the diameter of the high damping elastomer in the center portion is increased, the same drawback as described above occurs. However, there is a disadvantage that the instability of the deformation increases because it is not constrained. As described above, the conventional seismic isolation bearing device consisting of a combination of so-called high-damping rubber and ordinary laminated rubber has only one high-damping rubber as a core at the center, and is laminated in a form surrounding it. It is common technical knowledge that the structure in which rubber exists is used.Therefore, in this type of conventional seismic isolation bearing, the cross-sectional shape of the high-damping rubber is large and small while maintaining the form stability of the high-damping rubber. Therefore, it was difficult to obtain the desired seismic isolation performance with a simple configuration.

[0004]

In order to advantageously solve the above-mentioned problems, in the seismic isolation elastic rubber bearing for a structure of the present invention, a metal plate 7 for suppressing elongation is embedded in the middle part, the upper part and the lower part. A plurality of openings 3 penetrating in a vertical direction at predetermined intervals are provided in a substantially rectangular elastic rubber bearing 2 having an elastic rubber layer 1 formed therein. Is fitted with a seismic isolation rubber bearing 5 having a middle part and a high damping rubber layer 4 embedded in the upper and lower parts,
The elastic rubber bearing 2 and the seismic isolation rubber bearing 5 are connected by an adhesive 6.

[0005]

According to the present invention, by changing the number of openings 3 formed in the elastic rubber bearing 2, the overall sectional area of the seismic isolation rubber bearing 5 inserted into each opening 3 can be increased or decreased. Thereby, the ratio of the elastic rubber bearing 2 and the seismic isolated rubber bearing 5 in the seismic isolated elastic rubber bearing can be easily set to the optimum ratio according to the use condition in each application. It is held in each opening 3 of an appropriate size, and its shape can be stably held.

[0006]

1 to 5 show one embodiment of the present invention, in which a plurality of circular openings 3 penetrating vertically.
Metal plates 7 for suppressing the expansion of the elastic rubber layer 1 are buried in the middle, upper and lower portions of the elastic rubber layer 1 provided at the center, thereby forming the elastic rubber bearing 2. The plurality of openings 3 in the elastic rubber bearing 2 are
The two elastic rubber bearings 2 are arranged at a predetermined interval in a well-balanced manner, and a seismic isolation rubber bearing 5 is fitted into each opening 3. The seismic isolation rubber bearing 5 is configured by embedding a metal plate 8 for suppressing the extension of the high-damping rubber layer 4 in the middle, upper and lower portions of the cylindrical high-damping rubber layer 4.

The elastic rubber layer 1 has, for example, a hardness of 5
A rubber material of 0 to 60 degrees is used, and the high-damping rubber layer 4 is made of, for example, a vibration-proof rubber made of viscoelastic rubber.
The opening 3 and the seismic isolation rubber bearing 5 have a flat shape of 4.
It may be square. In addition, as shown in FIG. 3, it is preferable that the elastic rubber bearing 2 and the seismic isolation rubber bearing 5 be bonded to each other with the adhesive 6 at the opening 3.

[0008]

According to the present invention, a substantially rectangular flat elastic rubber bearing 2 having an elastic rubber layer 1 embedded in an intermediate portion and upper and lower portions of a metal plate 7 for suppressing elongation is provided at substantially equal intervals. A plurality of openings 3 penetrating in the vertical direction are provided, and in each of the openings 3, a metal plate 8 that also suppresses expansion has a middle damping portion and a high damping rubber layer 4 embedded in upper and lower portions. Since the structure is such that the rubber bearing 5 is inserted, the rubber bearing for a structure can have both the seismic isolation function and the elastic bearing function by simple means.
Since the seismic isolation rubber bearings 5 are fitted into the plurality of openings 3 so as to have both the seismic isolation function and the elastic bearing function, the number of the openings 3 can be increased or decreased to increase or decrease the number of the openings 3. The occupancy ratio of the elastic rubber bearing 2 and the seismic isolation rubber bearing 5 can be easily and appropriately changed while the stability of the shape retention of the seismic rubber bearing 5 is maintained, and the vibration energy of the elastic rubber bearing due to an earthquake or the like can be efficiently eliminated. According to the present invention, it is possible to provide a seismic isolation elastic rubber bearing for a structure having an optimal seismic isolation function and an elastic function according to a use form so as to be transmitted to a seismic rubber bearing and attenuated.

[Brief description of the drawings]

FIG. 1 is a plan view showing a seismic isolation elastic rubber bearing for a structure according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is a longitudinal sectional side view showing an adhesive connection between an elastic rubber bearing and a seismic isolation rubber bearing.

FIG. 4 is a longitudinal sectional side view showing an elastic rubber bearing.

FIG. 5 is a longitudinal sectional side view showing a seismic isolation rubber bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic rubber layer 2 Elastic rubber bearing 3 Opening 4 High attenuation rubber layer 5 Seismic isolation rubber bearing 6 Adhesive 7 Metal plate 8 Metal plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of metal plates 7 for suppressing elongation penetrating in a vertical direction at predetermined intervals in a substantially rectangular elastic rubber bearing 2 having an elastic rubber layer 1 embedded in an intermediate portion and upper and lower portions. The base-isolated rubber bearing 5 includes a metal plate 8 having a middle portion and a high damping rubber layer 4 embedded in the upper portion and the lower portion in each of the openings 3.
Wherein the elastic rubber bearing 2 and the seismic isolation rubber bearing 5 are joined together by an adhesive 6.