JP2002195327A - Laminated rubber pivotally supporting body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure sufficient durability and reliability of a laminated rubber pivotally supporting body by preventing an excessive tension from acting on a laminated rubber part even if an extraction force acts on the laminated rubber pivotally supporting body when an abnormality such as the inclination of a building by an earthquake occurs to eliminate such an inconvenience that a space is produced in a rubber layer inside the laminated rubber pivotally supporting body and rigidity is lowered suddenly. SOLUTION: In this laminated rubber pivotally supporting body 10, flange members 13 and 14 are fixedly stuck on the upper and lower sides of the laminated rubber part 15 formed of rubber layers 11 and reinforcement plates 12 laminated to form integrally with each other. Thin wall parts 19 and 20 or opening parts 21 and 22 to lower the bending rigidity of the flange members are formed in the extended portions of the flange members 13 arid 14 (portions between the outer periphery of the laminated rubber part and the fixing part thereof to a structural member).

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 body in which rubber layers and reinforcing plates are alternately laminated and integrated, and mounting flange members are fixed to upper and lower end surfaces.

[0002]

2. Description of the Related Art A laminated rubber bearing is used as a bearing for supporting various structures in a seismic isolation or vibration isolation manner.
In buildings built on foundations and precision equipment installed on installation stands, it is necessary to minimize the transmission of external vibrations caused by earthquakes and passing vehicles, and to attenuate the transmitted vibrations as early as possible. Required. In addition, when protecting structures from earthquakes and further protecting structures requiring high safety and precision, such as nuclear facilities, computers, semiconductor manufacturing equipment, and electron microscopes, from vibrations, In addition to blocking large earthquakes, it is also required to block small vibrations.

[0003] In order to respond to such demands and to elastically support various structures so as to be seismically isolated or anti-vibration, laminated rubber bearings are used. This laminated rubber bearing for seismic isolation support has a laminated rubber portion in which a rubber layer and a reinforcing plate are alternately laminated and integrated. As the reinforcing plate, for example, a metal or hard plastic plate is used. Such a laminated rubber bearing body is usually composed of a rubber material and a reinforcing plate alternately laminated, and further, an attachment (fixing) bonded to upper and lower end surfaces.
It is manufactured by a method of integrating by integrating the flange member into a mold and performing vulcanization molding. The laminated rubber bearing body has a high spring constant in the vertical direction and a low spring constant in the horizontal direction, and the vertical / horizontal spring constant ratio may be as large as 800 or more.

In the above-mentioned laminated rubber bearing,
In a solid structure in which only the rubber layer and the reinforcing plate are laminated, the damping characteristic is the internal viscosity damping of only the rubber layer, so that the vibration damping ability may be too small depending on the type of rubber and the use conditions. Therefore, in order to improve the vibration damping ability, a hole (cavity) is formed through the rubber layer and the reinforcing plate in the vertical direction, and a viscoelastic material such as raw rubber, tar, metallic lead (column-shaped lead plug) is formed inside. By encapsulating a filler material, a laminated rubber bearing body having an increased vibration damping capacity while preventing an increase in the free surface area of the bearing body and restraining deformation and preventing an excessive decrease in longitudinal spring constant is known, for example. It has been proposed in Japanese Unexamined Patent Publication No. 63-293340, Japanese Patent Laid-Open No. 2000-110878, and the like.

[0005]

The laminated rubber bearing composed of the laminated rubber portion described above is weak in pulling force (tensile load in the vertical direction) due to its structure, and has a tensile stress of 1 to 2N. / Mm ² or a tensile strain of 1 to 2%, voids are generated inside the rubber layer, and thereafter, the rigidity is sharply reduced. Therefore,
It should be avoided to use in a region above the stress and strain (hereinafter referred to as a tensile linear limit stress) at which the above-mentioned voids are generated.

On the other hand, when constructing a seismic isolation support structure for a building or various structures, a plurality of laminated rubber bearings are arranged at predetermined intervals on a floor between a foundation and a building (structure). Normally, a vertical load (weight of a building or a structure) acts on all of these laminated rubber bearing bodies. However, when a large horizontal exciting force acts due to an earthquake or the like, In some areas of the floor surface of buildings and structures, there is an area that is displaced in the lifting direction due to rolling and tilting, and the laminated rubber bearing placed in that area has a pulling force opposite to gravity May act. This means that the conventional laminated rubber bearing is not suitable for seismic isolation of a building with a high tower ratio, such as a high-rise building. Therefore, it has been demanded to realize a laminated rubber bearing that can be used with sufficient reliability even when a pull-out force acts.

The present invention has been made in view of such technical problems, and an object of the present invention is to apply a pulling force to a laminated rubber bearing used for seismic isolation support of buildings and various structures. Even in this case, it is possible to eliminate the inconveniences such as the occurrence of voids inside the laminated rubber bearing and a sudden decrease in rigidity, and to provide a laminated rubber bearing that can be used with sufficient durability and reliability. To provide.

[0008]

Means for Solving the Problems The present invention (claim 1) provides:
In order to achieve the above object, in a laminated rubber bearing body having a laminated rubber portion formed by alternately laminating and integrating a rubber layer and a reinforcing plate, in order to use by fixing to upper and lower structural members with bolts or the like, A flange member fixed to an upper end surface and a lower end surface of the laminated rubber portion, wherein at least one of the flange members is provided at a portion between an outer periphery of the laminated rubber portion and a fixing portion to the structural member. Characterized in that a thin portion or an opening for reducing the bending rigidity is formed.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the thin portion is formed over the entire outer periphery of the laminated rubber portion, and the opening is formed of the laminated rubber portion. A configuration composed of a plurality of through holes formed at predetermined intervals over the entire outer periphery of the configuration, a configuration in which the laminated rubber portion and each of the flange members are integrated by vulcanization molding of a rubber layer or adhesion with a rubber layer, The thin portion is formed by annular grooves provided on both the upper surface and the lower surface of the flange member, or the thin portion is
The above object is achieved efficiently by adopting a structure formed by an annular groove provided on one side surface of the upper surface or the lower surface of the flange member.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view showing a first embodiment of a laminated rubber bearing body to which the present invention is applied, and FIG. 2 is a sectional plan view taken along line 2-2 in FIG. In FIGS. 1 and 2, the laminated rubber bearing body 10 has a rubber layer 11 and a reinforcing plate 12 alternately laminated, and flange members 13 and 14 are joined to upper and lower end surfaces, respectively, and these are integrated by vulcanization molding or the like. Having a structure. In other words, the laminated rubber bearing body 10 has the upper flange member 13 and the lower flange member 14 integrated with the upper and lower end surfaces of the laminated rubber portion 15 composed of the rubber layer 11 and the reinforcing plate 12 which are alternately laminated and integrated. The lower flange member 14 is fixedly bonded (fixed by vulcanization molding or bonding).
Is fixed to a lower structural member 17 such as a foundation member with bolts 18 and the like, and the upper flange member 13 is bolted to an upper structural member 16 as a seismic isolation target such as a building or a test device.
By fixing at 8 or the like, the upper structural member 16 is seismically isolated and supported.

In the laminated rubber bearing 10 shown in FIGS. 1 and 2, the outer periphery of the laminated rubber portion 15 and the upper and lower structural members 16, 17 of the upper and lower flange members 13, 14 are respectively provided.
Thin portions 19 and 20 for reducing the bending stiffness of the flange members 13 and 14 are formed in portions between the fixing members (fastened portions by bolts 18). In the illustrated example, both the thin portion 19 of the upper flange member 13 and the thin portion 20 of the lower flange member 14
Is formed by annular grooves provided on both the upper surface and the lower surface of each of the flange members 13 and 14 over the entire outer periphery of the flange member 13.

FIGS. 3 to 6 are diagrams illustrating the use of the laminated rubber bearing 10 shown in FIGS. 1 and 2. FIGS. 3 and 4 show the laminated rubber bearing 10 used alone. Structural members such as buildings, devices and equipment (upper structural members)
It is a schematic side view and a schematic plan view showing a state in which the base member 16 is elastically supported (seismically isolated) on a lower structural member (base or the like) 17 such as a foundation or a floor. FIGS. 5 and 6 show a plurality of (four in the illustrated example) laminated rubber bearing bodies 10 with a stabilizer 80.
Are connected in a plurality of stages (for example, 5 to 20).
Using the multi-stage seismic isolation unit 100 assembled over the steps, a structural member 16 such as a building, an apparatus, or a device is connected via the multi-stage seismic isolation unit 100 to a lower structural member (base) such as a foundation or a floor. It is a schematic side view and a schematic plan view showing a state of being elastically supported (seismically isolated support) on a base 17 or the like).

FIG. 7 shows a laminated rubber bearing (shown on the left side in FIG. 7) in an area where the upper structural member 60 is inclined and the structural member rises due to an earthquake or the like in the state of FIGS. FIG. 3 is a schematic side view showing a state in which a pull-out force (tensile force) acts on a laminated rubber bearing body (10). FIG. 8 shows FIG.
6, an earthquake or the like occurs in the state of FIG.
Is a schematic diagram showing a state in which a pull-out force (pulling force) acts on a laminated rubber bearing body 10 (laminated rubber bearing body arranged on the left side area in FIG. 8) arranged in a region where the structural member is lifted up. It is a side view. That is, as shown in FIGS. 7 and 8, when a structural member 16 such as a building is inclined due to an earthquake or the like and a partial floating state occurs, the laminated rubber bearing body 10 (FIG. An abnormal load state occurs in which a tensile force (a force in a direction opposite to the normal compressive force) acts on the left support in FIG. 7 and the left support in FIG.

According to the laminated rubber bearing body 10 shown in FIGS. 1 and 2, each flange member 1 fixed to the end face of the laminated rubber portion 15 is fixed to the upper and lower structural members 16 and 17.
3 and 14, the outer periphery of the laminated rubber portion 15 and the structural member 1
Since thin portions 19 and 20 for reducing the bending rigidity of the flange member are provided in portions (projections) between portions fixed to portions 6 and 17 (fastened portions by bolts 18), upper and lower structural members are provided. Laminated rubber bearing 1 fixed to 16 and 17
By lowering the overall tensile stiffness of 0, it is possible to obtain a structure in which the tensile linear limit strain can be largely increased without substantially changing the tensile linear limit stress, whereby the displacement of the laminated rubber portion 15 in the tensile direction can be achieved. The follow-up performance can be increased, and voids (voids) can be prevented from being generated inside the laminated rubber portion 15 (rubber layer 11), and a decrease in rigidity due to the voids can be eliminated. In other words, even when a load in the pull-out direction acts on the laminated rubber support 10, the rubber layer 11 of the laminated rubber support 10 is adversely affected by easily displacing and following the pull-out direction (for example, the generation of the voids). ), The structural member 16 such as a building can be lifted in a region where the laminated rubber bearing body 10 is fixed.

FIG. 9 shows a comparison between the spring characteristic (a) in the tensile direction of the conventional laminated rubber bearing and the spring characteristic (b) in the tensile direction of the laminated rubber bearing according to the embodiment of the present invention. In the graph, the horizontal axis represents tensile strain, and the vertical axis represents tensile stress. That is, the graph of FIG. 9 shows that the overhanging portion of the flange member has a sufficiently high flexural rigidity and is fixed to the conventional laminated rubber support and the upper and lower structural members 16 and 17 as in the above-described embodiment of the present invention. Flange member 13, 1
By adopting a structure in which the bending stiffness of the overhang portion of 4 is reduced, the laminated rubber bearing body in which the overall tensile stiffness of the laminated rubber bearing body 10 fixed to the upper and lower structural members 16 and 17 is reduced, the It is a comparison showing spring characteristics when a pulling force (tensile force) is applied.

As is apparent from the graphs of FIGS. 9A and 9B, according to the laminated rubber bearing (b) according to the embodiment of the present invention, the conventional laminated rubber bearing (a) is different from the conventional laminated rubber bearing (a). In comparison, the tensile strain limit can be greatly increased without changing the tensile limit stress. Therefore, according to the laminated rubber bearing body 10 of the present invention, even when the upper structural member 16 is inclined due to an earthquake or the like and a pulling force acts on the laminated rubber bearing body 10, the laminated rubber bearing body 10 is easily displaced in the pulling direction. By following, the floating of the structural member 16 such as a building in the area where the laminated rubber bearing body 10 is fixed is allowed without adversely affecting the rubber layer 11 of the laminated rubber portion 15 (such as the generation of the void). It becomes possible.

As described above, according to the embodiment described above, the bending rigidity is reduced at the portions (thin portions) 19 and 20 where the thickness of the flange members 13 and 14 is reduced.
When the pull-out force acts on the laminated rubber bearing body 10 due to the lifting of the flange 6, the deformation of the flange members 13 and 14 becomes easy, and it is possible to prevent the tensile force acting on the laminated rubber portion 15 from becoming excessive. Therefore, even when a pull-out force acts on the laminated rubber bearing used for seismic isolation support of buildings and various structures, voids are generated inside the laminated rubber bearing and the rigidity is suddenly reduced. And a laminated rubber bearing that can be used with sufficient durability and reliability is provided.

FIG. 10 is a schematic longitudinal sectional view showing a second embodiment of the laminated rubber bearing to which the present invention is applied. In the laminated rubber bearing body of FIG. 1 and FIG. 2 (first embodiment), the thin portions 19 and 20 are formed by providing annular grooves on both the upper surface and the lower surface of the projecting portions of the upper and lower flange members 13 and 14. FIG.
In the second embodiment, the thin portions 19 and 20 are formed by providing annular grooves only on one side surface (the outer surface in the illustrated example) of the upper and lower flange members 13 and 14. The second embodiment differs from the above-described first embodiment only in this point, and has substantially the same configuration in other parts, and a detailed description thereof will be omitted. That is, when the present invention is carried out, the thin portions 19 and 20 are provided with the flange members 13 and 14.
Any structure may be used so long as the bending stiffness of the overhanging portion is reduced and the characteristics described with reference to the graph of FIG. 9 are obtained. For each flange member, an annular groove is formed on either the upper surface or the lower surface. Whether to provide them or to provide them on both sides can be appropriately selected. In addition, the thin portion itself may be provided only on one of the upper and lower flange members 13 and 14 in some cases.

FIG. 11 is a longitudinal sectional view showing a third embodiment of the laminated rubber bearing body 10 to which the present invention is applied, and FIG.
FIG. 12 is a plan sectional view taken along line 12-12 in FIG. In the third embodiment, as means for reducing the bending rigidity of the projecting portions of the flange members 13 and 14, the thin portion 1 is used.
Openings 21 and 22 are formed in place of 9 and 20. In the illustrated example, the openings 21 and 22 are formed by a plurality of through holes formed at predetermined intervals over the entire periphery of the flange members 13 and 14, that is, over the entire outer periphery of the laminated rubber portion 15. The third embodiment differs from the first and second embodiments in that an opening is provided in place of the thin portion, but the other portions have substantially the same configuration. Detailed description is omitted.

Also in the third embodiment, when the embodiment is carried out, the openings 21 and 22 are formed by the flange members 13 and
The projecting portion 14 may have a structural size that reduces the bending stiffness of the overhang portion and obtains the characteristics as described with reference to the graph of FIG. 9, and may take various shapes and arrangements. In addition, the opening itself may be provided only in one of the upper and lower flange members 13 and 14 in some cases. The various embodiments (second and third embodiments, various modifications thereof) described with reference to FIGS. 10 to 12 are also similar to those of the first embodiment described with reference to FIGS. The operation and effect of the invention can be obtained.

FIG. 13 is a longitudinal sectional view showing a modified example of the laminated rubber bearing body 10 to which the present invention is applied. The laminated rubber bearing of FIG. 13 differs from that of FIG. 1 in that flange members 13 and 14 are integrally fixed to upper and lower end surfaces of a laminated rubber portion 15.
2 is different from that shown in FIG. 2 in that lead or the like is filled and sealed inside to increase the vibration damping ability. That is, the laminated rubber bearing body 10 of FIG. 13 also has the laminated rubber portion 15 in which the rubber layers 11 and the reinforcing plates 12 are alternately laminated and integrated, and the upper and lower end faces of the laminated rubber portion 15 have flange members ( Although the mounting flanges 13 and 14 are integrally formed, the laminated rubber bearing body 10 shown in FIG. 13 has a hollow portion formed in the center thereof formed of a plastic material such as lead, raw rubber or soft plastic, or a viscoelastic material. The vibration damping capacity is increased by filling and sealing an internal loss material (damping material) 23 such as a material.

Also in the laminated rubber bearing body 10 shown in FIG. 13, thin portions 19 and 20 are formed at the overhanging portions of the upper and lower flange members 13 and 14, as in the case of FIGS. 13 and 14 are reduced in bending stiffness. That is, as a laminated rubber bearing, FIG.
As shown in FIG. 3, those having various structures and various functions have been developed and put into practical use. However, the present invention provides a bearing having a laminated rubber portion (laminated rubber bearing).
The present invention can be similarly applied to these various structures, and the same operation and effect can be obtained.

[0023]

As is apparent from the above description, according to the present invention (claim 1), there is provided a laminated rubber support having a laminated rubber portion in which a rubber layer and a reinforcing plate are alternately laminated and integrated. A flange member fixed to an upper end surface and a lower end surface of the laminated rubber portion for use by being fixed to upper and lower structural members with bolts or the like, and at least one of the flange members, the outer periphery of the laminated rubber portion; Since a thin portion or an opening for reducing the bending rigidity of the flange member is formed at a portion between the fixing portion to the structural member, it is used for seismic isolation support of buildings and various structures. Even when a pull-out force is applied to the laminated rubber bearing body, it is possible to eliminate the inconveniences such as the occurrence of voids inside the laminated rubber bearing body and sudden decrease in rigidity, and sufficient durability and reliability. Use with DOO laminated rubber bearing body is provided which can be.

According to the second to sixth aspects of the present invention, in addition to the configuration of the first aspect, the thin portion is formed over the entire outer periphery of the laminated rubber portion, and the opening is
A configuration comprising a plurality of through holes formed at predetermined intervals over the entire outer periphery of the laminated rubber portion, wherein the laminated rubber portion and each of the flange members are integrated by vulcanization molding of a rubber layer or adhesion with a rubber layer. Configuration, wherein the thin portion is formed by annular grooves provided on both the upper surface and the lower surface of the flange member, or the thin portion is provided on one side surface of the upper surface or the lower surface of the flange member. Since the configuration is formed by the annular groove, a laminated rubber bearing body capable of efficiently achieving the above-described effects is provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a laminated rubber bearing body to which the present invention is applied.

FIG. 2 is a plan sectional view taken along line 2-2 in FIG.

FIG. 3 is a schematic side view showing a state in which a structural member is seismically isolated and supported using the laminated rubber bearing shown in FIGS. 1 and 2.

FIG. 4 is a plan sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a schematic side view showing a state in which a structural member is seismically isolated and supported using a multi-stage seismic isolation unit configured by assembling a plurality of laminated rubber bearing bodies with a stabilizer.

FIG. 6 is a plan sectional view taken along line 6-6 in FIG. 5;

7 is a schematic side view showing a state in which a tensile force acts on a laminated rubber bearing body when a structural member supported by the seismic isolation support structure shown in FIG. 3 is inclined by an earthquake or the like.

8 is a schematic side view showing a state in which a tensile force acts on a laminated rubber support when a structural member supported by the seismic isolation support structure shown in FIG. 5 is inclined by an earthquake or the like.

FIG. 9 is a graph showing a comparison between a spring characteristic (a) in a tensile direction of a conventional laminated rubber bearing and a spring characteristic (b) in a tensile direction of a laminated rubber bearing according to an embodiment of the present invention.

FIG. 10 is a schematic longitudinal sectional view showing a second embodiment of the laminated rubber bearing body to which the present invention is applied.

FIG. 11 is a longitudinal sectional view showing a third embodiment of the laminated rubber bearing body to which the present invention is applied.

FIG. 12 is a plan sectional view taken along line 12-12 in FIG. 11;

FIG. 13 is a longitudinal sectional view showing a modified example of the laminated rubber bearing to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Laminated rubber bearing body 11 Rubber layer 12 Reinforcement plate 13 Flange member 14 Flange member 15 Laminated rubber part 16 Structural member (upper side) 17 Structural member (lower side) 19 Thin part 20 Thin part 21 Opening 22 Opening 80 Stabilizer 100 Multi-stage seismic isolation unit

Claims (6)

[Claims] 1. A laminated rubber bearing having a laminated rubber portion formed by alternately laminating and integrating a rubber layer and a reinforcing plate, wherein the laminated rubber is used by being fixed to upper and lower structural members with bolts or the like. A flange member fixed to an upper end surface and a lower end surface of the portion, wherein at least one of the flange members is bent at a portion between an outer periphery of the laminated rubber portion and a fixing portion to the structural member. A laminated rubber bearing, wherein a thin portion or an opening for reducing rigidity is formed. 2. The laminated rubber bearing according to claim 1, wherein the thin portion is formed over the entire outer periphery of the laminated rubber portion. 3. The laminated rubber bearing according to claim 1, wherein the opening comprises a plurality of through holes formed at predetermined intervals over the entire outer periphery of the laminated rubber portion. 4. The method according to claim 1, wherein the laminated rubber portion and each of the flange members are integrated by vulcanization molding of a rubber layer or adhesion to the rubber layer. Laminated rubber bearing. 5. The laminated rubber bearing according to claim 1, wherein the thin portion is formed by annular grooves provided on both an upper surface and a lower surface of the flange member. 6. The laminated rubber bearing according to claim 1, wherein the thin portion is formed by an annular groove provided on one side of an upper surface or a lower surface of the flange member.