JP2011220360A - Rubber bearing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber bearing body for particularly effectively reducing weight, while securing required strength to vibration input such as an earthquake to a building.SOLUTION: A rubber plate 2 and a rigid plate are alternately laminated, and at lest a part of the rigid plate is constituted of a combination of two kinds or more of hard members different in a specific gravity and strength.

Description

  The present invention relates to a technique for reducing the weight of a rubber bearing body formed by alternately laminating a rubber plate and a rigid board, particularly a rubber bearing body used in a seismic isolation device or the like while ensuring a required strength. .

  Conventionally, in order to protect buildings and structures from vibration inputs such as earthquakes, for example, Patent Documents 1 and 2 disclose seismic isolation devices composed of rubber bearings in which rubber sheets and steel plates are alternately laminated. .

  However, in such a rubber bearing body, since a single type of heavy steel plate is used as a rigid plate throughout, the weight of the rubber bearing body inevitably increases, and therefore, the rubber bearing body. It was difficult to manufacture, transport, construct and install the body.

Japanese Patent Laid-Open No. 11-141181 JP 2004-308861 A

  The present invention provides a rubber bearing body in which the required strength against vibration input such as an earthquake to a building or the like is ensured and the weight is particularly reduced effectively.

  As shown in FIG. 4A, the stress at the time of deformation of the laminated rubber is schematically shown as a shear stress generated when a single-layer pad (corresponding to one rubber plate of a rubber support) receives a compressive load. In addition, as shown in FIG. 4 (b), the moment generated when the rubber bearing body undergoes shear deformation is schematically shown. The stress becomes the largest at the end of the rubber bearing.

  Therefore, in at least a part of the rigid plate, a hard member having a relatively small specific gravity and a relatively low strength is disposed in a region where the stress generated when the rubber bearing is deformed is small, and in a region where the stress is large, By using a hard member having a large specific gravity and strength, the weight of the entire rubber support can be reduced based on the use of a hard member having a low specific gravity compared to a conventional rubber support.

  The rubber bearing body of the present invention is formed by alternately laminating rubber plates and rigid plates, and at least a part of the rigid plate is composed of a combination of two or more kinds of hard members having different specific gravity and strength. It is characterized by being formed.

  Here, the strength refers to the maximum resistance value of the material against an external force. The metal material is measured according to JIS Z2241, and the plastic material is measured according to JIS K7133.

  In such a rubber support body, more preferably, a hard member having a relatively high specific gravity and strength is disposed around a hard member having a low specific gravity and strength.

  Preferably, at least a part of the rigid plate, which is a hard member having a relatively high specific gravity and strength, is disposed at the upper and lower portions in the stacking direction of the rubber plate and the rigid plate.

  In the rubber bearing body according to the present invention, at least a part of the rigid plate is constituted by a combination of two or more types of hard members having different specific gravity and strength. For example, a hard member having a specific gravity and strength lower than that of a steel plate is partially formed. By including, the weight of the entire rubber bearing body can be reduced, and a hard member having a relatively high specific gravity and strength is arranged in a predetermined region where the stress of the rubber bearing body is large, so that Vibration input such as earthquakes can be reduced. As a result, it is possible to improve the manufacture, transportation and workability of the rubber bearing body.

It is width direction sectional drawing which shows one Embodiment of the seismic isolation structure of this invention. It is width direction sectional drawing which shows other embodiment of the seismic isolation structure of this invention. It is width direction sectional drawing which shows one Embodiment of the seismic isolation structure of this invention. (A) is a cross-sectional view in the width direction schematically showing the shear stress generated when the single-layer pad receives a compressive load, and (b) schematically shows the moment generated when the rubber bearing body undergoes shear deformation. FIG.

Hereinafter, the seismic isolation structure of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view in the width direction showing one embodiment of the seismic isolation structure of the present invention.

  The illustrated rubber support 1 includes, for example, a plurality of disk-shaped rigid plates and a plurality of disk-shaped elastic rubber plates 2 alternately laminated with a uniform thickness and extending in the vertical direction. The laminated body 3 and each mounting face plate 4 that protrudes laterally from the rubber laminated body 3 fixed to the upper and lower ends of the rubber laminated body 3 are provided.

  The rubber bearing body 1 is attached to a building and its foundation by inserting a bolt into a bolt hole (not shown) formed in the mounting face plate 4, and the building is supported via the rubber bearing body 1.

  Here, a coating rubber is arranged on the outer periphery of the rubber laminate 3 to prevent the rigid plate from being exposed to the outside, and a seismic isolation plug is press-fitted into the center of the rubber laminate 3. The seismic isolation plug may be configured to absorb vibration energy by plastic deformation.

  For example, after laminating a rigid plate and a member such as an unvulcanized rubber composition, the rubber laminate 3 is firmly bonded by, for example, vulcanization adhesion so that they are not inadvertently separated or misaligned. Like that.

When such a rubber support body 1 receives a shearing force in the horizontal direction due to vibration, the rubber laminate 3 elastically shears and deforms as a whole, effectively absorbing vibration energy, and damping. By having performance and the like, vibration can be quickly damped.
In addition, since the rigid plates and the rubber plates 2 are alternately laminated, even when a load is applied in the vertical direction, the compression of the rubber laminate 3 is suppressed and a restoring force can be exhibited. As a result, the rubber laminate 3 can exhibit the effect of suppressing the amount of shear deformation and increasing the upper and lower springs.

  In this rubber bearing body 1, at least a part of the rigid plate, in the figure all the rigid plates are combined with two or more kinds of hard members having different specific gravity and strength, and in the figure, the first specific gravity and strength are relatively high. The hard member 5 is arranged around the second hard member 6 having a low specific gravity and strength.

  Preferably, the diameter r of the second hard member 6 disposed in the rubber laminate 3 is such that the ratio of the diameter R of the rubber laminate 3 and the strength a of the first hard member 5 to the strength b of the second hard member 6 is a. : B is preferably set to R × a / b or less. In this range, the weight of the rubber support 1 can be reduced and the strength of the second hard member 6 can be secured.

FIG. 2 is a cross-sectional view in the width direction showing another embodiment of the rubber bearing body of the present invention.
In addition, the same code | symbol is attached | subjected to the element similar to the rubber bearing body shown to the previous figure, and the description is abbreviate | omitted.
In this embodiment, the first hard member 15 having a relatively high specific gravity and strength is provided at the upper and lower portions in the lamination direction of the rubber laminate 3, and the second hard member 6 having a low specific gravity and strength is provided at the intermediate portion in the lamination direction. Deploy.

  Preferably, the height h of the second hard member 16 disposed in the rubber laminate 3 is the ratio of the height H of the rubber laminate 3, the strength a of the first hard member 15, and the strength plate b of the second hard member 16. In the case of a: b, it is preferably provided at H × a / b or less. In this range, the weight of the rubber support 1 can be reduced and the strength of the second hard member 16 can be secured. .

FIG. 3 is a cross-sectional view in the width direction showing another embodiment of the rubber bearing body of the present invention.
In addition, the same code | symbol is attached | subjected to the element similar to the rubber bearing body shown to the previous figure, and the description is abbreviate | omitted.
In this embodiment, the first hard member 25 having a relatively high specific gravity and strength is disposed around the second hard member 26 having a low specific gravity and strength at the upper and lower portions in the stacking direction of the rubber laminate 3. The two hard members 26 are arranged in the range of the height h and the diameter r in the middle part in the stacking direction.

  By the way, each hard member can be appropriately selected as necessary. For example, the specific gravity of the first hard member is 5.0, the strength is 300 MPa, and the specific gravity of the second hard member is 1.0 to 5. 0, its strength can be 100 MPa to 300 MPa, specifically, a steel plate such as SS400 can be used as the first hard member, and an aluminum steel plate or a phenol resin plastic can be used as the second hard member. .

Next, Examples rubber bearings 1 to 3 having a structure as shown in FIG. 1 and Table 1 and using hard members as shown in Table 2 and changing respective specifications as shown in Table 3. The total weight and the weight ratio were calculated for each of the comparative rubber bearings.
In addition, since the comparative example rubber support body does not require modification about structures other than a hard member, it shall be based on an Example rubber support body.

(Total weight of rubber bearing)
The total weight excluding the mounting face plate was calculated for each of the example rubber supports 1 to 3 and the comparative example rubber support, and the evaluation results are shown in Table 4.

(Rubber bearing weight ratio)
The total weight excluding the mounting face plate was calculated and measured for each of the example rubber bearing bodies 1 to 3 and the comparative example rubber bearing body, and the evaluation results are shown in Table 4.

  From the results of Table 4, in Example rubber bearings 1 to 3, the total weight and weight ratio of the rubber bearings were reduced compared to the comparative example rubber bearings.

DESCRIPTION OF SYMBOLS 1 Rubber support body 2 Rubber plate 3 Rubber laminated body 4 Mounting face plate 5,15,25 1st hard member 6,16,26 2nd hard member

Claims (3)

In the rubber bearing body in which rubber plates and rigid plates are laminated alternately,
At least a part of the rigid plate is formed by a combination of two or more kinds of hard members having different specific gravity and strength.   The rubber bearing body according to claim 1, wherein a hard member having a relatively high specific gravity and strength is disposed around a hard member having a low specific gravity and strength, at least a part of the rigid plate.   The rubber bearing according to claim 1 or 2, wherein at least a part of the rigid plate is provided with hard members having relatively high specific gravity and strength at an upper part and a lower part in a lamination direction of the rubber plate and the rigid plate. body.

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