JP2001140978A - Laminated rubber support body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain well spring performance and damping performance in elastic deformation in the horizontal direction by reducing and equalizing vibrations in surface pressure acting on the front surface of internally arranged leads, and reduce man-hours in a manufacturing process, the number of part items and cost by manufacturing a laminated rubber support body by one molding vulcanization. SOLUTION: In a laminated rubber support body 10 formed by alternatively laminating rubber layers 21 and reinforcing plates 22 and integrating them, leads 35 are embedded in all rubber layers 21 formed among respective reinforcing plates 22, 23 and 24 or in a part of the rubber layers 21.

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 lead is disposed inside.

[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, minimize the transmission of external vibrations caused by earthquakes and passing vehicles, and reduce 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 has a structure in which a rubber layer and a reinforcing plate such as a metal or hard plastic plate are alternately and integrally laminated, and the reinforcing plates are provided on upper and lower end surfaces thereof. A mounting flange member also serving as the fixing member is fixed. Such a laminated rubber bearing body is usually manufactured by a method in which a rubber material and a reinforcing plate, which are alternately laminated, and the flange member are integrated into a mold by vulcanization molding. The laminated rubber bearing has a high spring constant in the vertical direction and a low spring constant in the horizontal direction, and usually has a large ratio of the vertical and horizontal spring constants of 800 or more.

On the other hand, in a laminated rubber bearing composed of only the rubber layer and the reinforcing plate, the damping characteristic is only the internal viscous damping action of the rubber layer itself. May be. Therefore, in order to improve the vibration damping ability, a hole (cavity) penetrating vertically is formed inside the laminated rubber including the rubber layer and the reinforcing plate, and a filler such as a viscoelastic material is filled inside the through hole. By enclosing the bearing, a technique has been proposed in which the deformation is restrained by preventing the free surface area of the support from increasing, and the vibration damping ability is increased while preventing the longitudinal spring constant from excessively decreasing. Such a technique is disclosed in, for example, JP-A-63-293340. In that case, it has been proposed to use lead as a filler to be filled in the through hole. A material using lead as the filler is called, for example, a "laminated rubber bearing member containing lead or a laminated rubber bearing member containing lead plug".

[0005] In the case of the laminated rubber bearing body (lead-laminated rubber) filled with lead, the cavity formed by the through hole is
By press-fitting (filling rate of 1 or more) a lead having a volume slightly larger (for example, about 1%) than the volume of the cavity, the periphery of the lead is firmly pressed and held by the laminated rubber, thereby achieving a predetermined spring performance and damping performance. (Laminated rubber bearing)
Getting it done is done.

FIG. 12 is a longitudinal sectional view of a conventional leaded laminated rubber bearing. In FIG. 12, a laminated rubber bearing body 50 alternately laminates a rubber layer 21 and a reinforcing plate 22,
The flange members 23 and 24 are joined to the upper and lower end surfaces, and these are integrated by vulcanization molding. The rubber layer 21
A through-hole 26 is formed in the center of the laminated rubber portion 25 formed of the reinforcing plate 22 and extends vertically, and an opening 27 is formed at a position corresponding to the through-hole 26 of the upper flange member 23. An opening 28 is formed at a position corresponding to the through hole 26 of the lower flange member 24. The through-hole 26 is filled with a columnar lead (lead plug) 30. The lead 30 is press-fit into the through-hole (hollow) 26 by sealing the openings 27, 28 with cap plates 31, 31. Enclosed (filled). The upper and lower flange members 23 and 24 are provided with a plurality of mounting holes 33 for fastening the laminated rubber bearing body 50 to the upper and lower structures or the base with bolts or the like.

[0007]

However, FIG.
The conventional lead-containing laminated rubber support 50 shown in FIG. 1 has a structure in which lead is inserted into the cavity formed by the through holes 26 in the vertical direction, so that the rubber layer 21 and the reinforcing plate 2
After forming a laminated rubber with a through-hole integrated with 2 through a molding vulcanization process, a columnar lead 30 prepared separately is filled into the through-hole 26, and both ends of the through-hole 26 are connected to a cap plate 31, A step of sealing at 31 will be adopted. Therefore, the number of steps in the manufacturing process increases, and a structure in which the cap plates 31, 31 are fastened to the flange members 23, 24 at both ends by bolts or the like is required, so that the number of parts increases and the cost increases. There were challenges.

Further, the inner peripheral surface of the through hole 26 has a rubber layer (soft layer) 21 and a reinforcing plate (hard layer) 2 alternately laminated.
2, the surface of the filled lead 30 excessively bites into the rubber layer at a portion in contact with the rubber layer 21, resulting in a bellows-like wavy shape as a whole. The technical problem that the spring performance and the damping performance cannot be exhibited when elastically displaced in the horizontal direction, and the spring performance and the damping performance may not be able to be maintained well, that is, easily affected by surface pressure. There has been a technical problem that the predetermined damping performance cannot be exhibited. FIG. 13 is a partial longitudinal sectional view showing the state of the lead surface of the laminated rubber bearing of FIG. 12, and FIG. 14 shows various states where the spring performance when the laminated rubber bearing is displaced in the horizontal direction is not good. It is a graph which shows hysteresis curves (b), (c), and (d) in contrast with hysteresis curve (a) in a good state.

That is, in the conventional lead-containing laminated rubber support 50 as shown in FIG. 12, the filled lead 30 is excessively contained in the rubber layer at a portion in contact with the rubber layer 21 as shown in FIG. In the biting state, the pinching is performed by the repulsive elastic force from the rubber layer 21, and in the excessively biting portion, the surface of the filled lead 30 is the same as the portion pressed by the reinforcing plate 22. In this case, the shape becomes excessively wavy in a bellows shape, and therefore, FIG.
As shown in various hysteresis curves shown in (c) and (d), predetermined elasticity and damping performance may not be exhibited when elastically displaced in the horizontal direction.

[0010] The present invention has been made in view of such technical problems, and an object of the present invention is to reduce the variation in the surface pressure acting on the surface of lead disposed inside to reduce the uniformity. It is possible to maintain good spring performance and damping performance when elastically displaced in the horizontal direction, and furthermore, it is possible to manufacture a lead-containing laminated rubber bearing in a single molding vulcanization. It is an object of the present invention to provide a lead-containing laminated rubber bearing body which can reduce the number of steps in the above and can reduce the number of parts to reduce the cost.

[0011]

According to a first aspect of the present invention, there is provided a laminated rubber in which a rubber layer and a reinforcing plate are alternately laminated and integrated, and lead is disposed inside. In the bearing, the lead is disposed inside the rubber layer between adjacent reinforcing plates. According to a second aspect of the present invention, in order to achieve the above object, a rubber layer and a reinforcing plate are alternately laminated and integrated, and a part of the reinforcing plate A lead hole is formed in the rubber layer and the inside of the through hole between the reinforcing plate having no through hole above and below the reinforcing plate having the through hole.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the lead is disposed inside all the rubber layers, and the lead is disposed inside a part of the rubber layer. The lead is disposed at the center of the laminated rubber support, or the lead is disposed at a plurality of positions symmetrical with respect to the center of the laminated rubber support. This achieves the above object.

[0013]

Embodiments of the present invention will be described below with reference to 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, and FIG.
FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. In FIGS. 1 and 2, the laminated rubber bearing body 10 includes a rubber layer 21 and a reinforcing plate 22.
Are alternately laminated, and an upper flange member 23 and a lower flange member 24 are joined to an upper end surface and a lower end surface, respectively, and these are integrated by vulcanization molding. The upper and lower flange members 23 and 24 are provided with a plurality of mounting holes 33 for fastening the laminated rubber bearing body 10 to upper and lower structures or a base with bolts or the like. The rubber layer 21
Is formed of a rubber-like elastic material having a desired hardness and elastic modulus, and the reinforcing plate 22 and the upper and lower flange members 23 and 24 are made of a hard and high-strength material such as metal or hard plastic.

The upper flange member 23 and the lower flange member 24 are members for attaching a laminated rubber (laminated rubber portion 25) to a structure to be seismically isolated and supported. In the present specification (the present invention), when simply referred to as a “reinforcement plate” without being specified as a flange member, the term “reinforcement plate” means that the reinforcement plate 22 In addition, the upper and lower flange members 23 and 24 are included. The upper flange member 23 and the lower flange member 24 are provided with a plurality of mounting holes 33 for fastening the laminated rubber bearing body 10 to upper and lower structures, a base, or the like with bolts or the like.

Therefore, in the first embodiment shown in FIGS. 1 and 2, all of the reinforcing plates 22, 23, and 24 are formed of flat members having no holes (or openings). The thickness (height) substantially equal to the thickness of the rubber layer at the center of the rubber layer 21
Is disposed (embedded). The rubber layer 21 is formed by vulcanizing a rubber material such as raw rubber into a rubber-like elastic body, and vulcanizing the respective reinforcing plates (including upper and lower flange members) 22, 23, 24, and It is integrated with the lead 35A. That is, in the laminated rubber bearing body in which the rubber layers 21 and the reinforcing plates 22 are alternately laminated and integrated, and lead is disposed inside,
The lead is formed of a disc-shaped lead 35A that is disposed inside (in the illustrated example, nine layers) rubber layer 21 between adjacent reinforcing plates 22 and 22. In the first embodiment shown in FIGS. 1 and 2, the disc-shaped lead 35 </ b> A is all disposed at the center of the rubber layer 21.

According to the first embodiment shown in FIGS. 1 and 2, the rubber layer 21 and the reinforcing plate 22 are alternately laminated and integrated, and the laminated rubber bearing body 10 in which lead is disposed inside is used. The lead is formed of a disc-shaped lead 35A disposed between the adjacent reinforcing plates 22 and 22 and at the center inside all the rubber layers 21.

According to the laminated rubber bearing body 10 having such a configuration, as shown in FIG. 13, the lead 35A disposed inside the rubber layer 21 unnecessarily digs into the rubber layer 21 to generate excessively bellows-like waves. The shape of the rubber layer 21 is not
Thus, the compression can be held more uniformly and firmly as a whole. Therefore, when the building or the like is seismically isolated and supported by the laminated rubber bearing body 10 and the laminated rubber portion 25 attenuates horizontal vibration while being sheared and deformed in the horizontal direction, (b), (c), and ( The occurrence of the phenomenon shown in d) can be reduced or prevented, and the original spring performance and damping performance as shown in FIG. 14A or a performance close thereto can always be maintained. That is, the lead 35A disposed inside
The variation in the surface pressure acting on the surface can be reduced and made uniform, whereby the spring performance and the damping performance when elastically displaced in the horizontal direction can be maintained satisfactorily.

Further, according to the laminated rubber support 10 having the shape and structure as shown in FIGS. 1 and 2, the lead-containing laminated rubber support 10 can be manufactured by one molding vulcanization, so that the number of steps in the manufacturing process is reduced. In addition to this, it is possible to obtain the effect that the number of parts can be reduced and the cost can be reduced.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the laminated rubber bearing body to which the present invention is applied, and FIG. 4 is a line 4 in FIG.
FIG. 4 is a cross-sectional view taken along -4. According to the second embodiment shown in FIGS. 3 and 4, the rubber layer 21 and the reinforcing plate 22 are alternately laminated and integrated, and the laminated rubber bearing body 10 in which lead is disposed inside has the above-mentioned structure. Is the adjacent reinforcing plate 22,
22 and are formed of disc-shaped leads 35B arranged at a plurality of positions (four in the illustrated example) symmetrical with respect to the center inside all the rubber layers 21. 3 and 4
The embodiment differs from the first embodiment in FIGS. 1 and 2 in this respect, but has substantially the same configuration in other respects, and corresponding parts are denoted by the same reference numerals, and detailed description thereof is omitted. I do.

As in the case of the first embodiment shown in FIGS. 1 and 2, the surface pressure acting on the surface of the lead 35B disposed inside is also provided by the laminated rubber bearing body 10 as shown in FIGS. Can be reduced and uniformized, whereby the spring performance and the damping performance when elastically displaced in the horizontal direction can be favorably maintained. Also, the lead-containing laminated rubber bearing body 10 can be manufactured by a single molding and vulcanization even with the shape and structure as shown in FIGS.
In addition to the reduction in the number of steps in the manufacturing process, the number of parts can be reduced and the cost can be reduced.

FIG. 5 is a longitudinal sectional view showing a third embodiment of the laminated rubber bearing to which the present invention is applied. According to the third embodiment of FIG. 5, the rubber layer 21 and the reinforcing plate 22 are alternately laminated and integrated, and the lead is adjacent to the laminated rubber bearing body 10 in which lead is disposed inside. Reinforcement plates 22, 22
A part (five layers in the illustrated example) of a plurality of (nine layers in the illustrated example) rubber layers 21 formed between the upper and lower flange members 23 and 24 (including the upper and lower flange members 23 and 24 as the reinforcing plate). 21
Is composed of a disc-shaped lead 35C disposed inside the lead.
In the third embodiment shown in FIG. 5, the plurality of rubber layers 21 are formed by alternately stacking layers containing lead and layers containing no lead. FIG.
The third embodiment differs from the above-described first and second embodiments in this point, but has substantially the same configuration in other respects. Corresponding portions are denoted by the same reference numerals, and the same reference numerals are used. Detailed description is omitted.

The laminated rubber bearing 10 as shown in FIG. 5 also reduces the variation in the surface pressure acting on the surface of the lead 35C disposed inside and reduces the uniformity, similarly to the above-described embodiments. It is possible to maintain good spring performance and damping performance when elastically displaced in the horizontal direction. Further, since the lead-containing laminated rubber bearing body 10 can be manufactured by one molding vulcanization, It is possible to reduce the number of steps in the manufacturing process and to reduce the number of parts to reduce the cost.

FIG. 6 is a longitudinal sectional view showing a fourth embodiment of a laminated rubber bearing to which the present invention is applied. In the fourth embodiment shown in FIG. 6, lead 35 is provided inside some of the plurality of rubber layers 21.
5 is the same as the third embodiment in FIG. 5, but in the present embodiment, disc-shaped lead 35C is disposed inside each rubber layer 21 except for the uppermost layer and the lowermost layer. I have. FIG.
The fourth embodiment is different from the above-described third embodiment in this point. Therefore, according to this embodiment, the same effect as that of the embodiment of FIG. 5 can be obtained.

FIG. 7 is a longitudinal sectional view showing a fifth embodiment of the laminated rubber bearing to which the present invention is applied. According to the fifth embodiment of FIG. 7, the rubber layer 21 and the reinforcing plate 22 are alternately laminated and integrated, and a part of the reinforcing plate is included in the laminated rubber bearing body 10 in which lead is disposed inside. A through hole (or opening) 36 is formed in 22, the remaining reinforcing plate 22 is formed of a plate without a hole, and the lead is arranged between the adjacent reinforcing plates 22 without a hole through the through hole 36. Disc-shaped lead 35D disposed inside a single rubber layer (the uppermost layer and the lowermost layer in the illustrated example) between the cylindrical lead 35D and the non-perforated reinforcing plate.
And E. The fifth embodiment shown in FIG. 7 is different from the above-described embodiments in the above points, but has substantially the same configuration in other respects. Corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted. Omitted.

According to the fifth embodiment shown in FIG. 7, a through hole (or opening) 36 is formed in a part of the plurality of reinforcing plates 22, and the peripheral surface of the lead 35D is reinforced at the portion of the through hole 36. Although it is in contact with the plate 22, the area in contact with the reinforcing plate 22 can be greatly reduced as compared with the conventional example as shown in FIG. Therefore, the laminated rubber bearing 1 as shown in FIG.
Even if there is a difference depending on 0, as in the above-described embodiments, variations in the surface pressure acting on the surfaces of the leads 35D and 35E disposed inside are reduced to achieve uniformity. This makes it possible to maintain good spring performance and damping performance when elastically displaced in the horizontal direction. Further, since the lead-containing laminated rubber bearing body 10 can be manufactured by one molding vulcanization, the manufacturing process Thus, the number of parts can be reduced, and the number of parts can be reduced to reduce the cost.

FIGS. 8 to 11 are diagrams illustrating the usage of the laminated rubber bearing member 10 described above. FIGS.
Is a schematic side view showing a state in which a laminated rubber bearing body 10 is used alone and a structure 60 such as a building, an apparatus, or an apparatus is elastically supported on a base 70 such as a foundation or a floor one by one; It is a schematic plan view. FIGS. 10 and 11 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, the structure 60 such as a building, an apparatus, or an apparatus is elastically supported on a base 70 such as a foundation or a floor via the multi-stage seismic isolation unit 100. FIG. 2 is a schematic side view and a schematic plan view showing a state in which

[0027]

As is apparent from the above description, according to the first aspect of the present invention, the rubber layer and the reinforcing plate are alternately laminated and integrated to form a laminated rubber bearing having lead disposed therein. In the body, the lead is arranged inside the rubber layer between the adjacent reinforcing plates, so that the variation in the surface pressure acting on the surface of the lead arranged inside is reduced and the lead is made uniform. This makes it possible to maintain good spring performance and damping performance when elastically displaced in the horizontal direction.In addition, since the lead-containing laminated rubber bearing can be manufactured by a single molding vulcanization, it can be used in the manufacturing process. Provided is a lead-containing laminated rubber bearing that can reduce man-hours and reduce the number of parts to reduce costs.

According to the second aspect of the present invention, a rubber layer and a reinforcing plate are alternately laminated and integrated, and lead is disposed inside the laminated rubber bearing body. A hole is formed, and the lead is disposed inside the rubber layer and the through hole between the reinforcing plate having no through hole above and below the reinforcing plate having the through hole. The uniformity can be achieved by reducing the variation of the surface pressure acting on the surface of the steel, and thereby the spring performance and the damping performance when elastically displaced in the horizontal direction can be maintained well. Since a laminated rubber bearing can be manufactured by one molding vulcanization, a lead-containing laminated rubber bearing can be provided which can reduce man-hours in a manufacturing process and reduce the number of parts to reduce costs.

According to the invention of claims 3 to 6, in addition to the structure of claim 1 or 2, the lead is disposed inside all the rubber layers, and the lead is partially contained in the rubber layer. , The lead is disposed at the center of the laminated rubber support, or the lead is disposed at a plurality of positions symmetrical with respect to the center of the laminated rubber support. Therefore, similarly, it is possible to reduce the variation of the surface pressure acting on the surface of the lead disposed inside and to achieve the uniformity, thereby improving the spring performance and the damping performance when elastically displacing in the horizontal direction. In addition, since the lead-containing laminated rubber bearing body can be manufactured in one molding vulcanization, the man-hour in the manufacturing process can be reduced, and the number of parts can be reduced to reduce the cost. Rubber branch The body is provided.

[Brief description of the drawings]

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

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

FIG. 3 is a schematic longitudinal sectional view of a second embodiment of a laminated rubber bearing body to which the present invention is applied.

FIG. 4 is a schematic cross-sectional view taken along line 4-4 in FIG.

FIG. 5 is a schematic longitudinal sectional view of a third embodiment of a laminated rubber bearing body to which the present invention is applied.

FIG. 6 is a schematic longitudinal sectional view of a laminated rubber bearing according to a fourth embodiment of the present invention.

FIG. 7 is a schematic longitudinal sectional view of a fifth embodiment of the laminated rubber bearing body to which the present invention is applied.

FIG. 8 is a schematic side view showing a state in which a structure is elastically supported on a base using a single laminated rubber bearing.

FIG. 9 is a schematic plan view of FIG.

FIG. 10 is a schematic diagram showing a state in which a structure is elastically supported on a base using a multi-stage seismic isolation unit in which a plurality of laminated rubber bearings connected at upper and lower end surfaces thereof are assembled in a plurality of stages by a stabilizer; It is a side view.

11 is a schematic plan view of FIG.

FIG. 12 is a schematic longitudinal sectional view showing an example of a conventional laminated rubber bearing.

FIG. 13 is a partial longitudinal sectional view showing a state of a surface of lead of the laminated rubber bearing body of FIG. 12;

FIG. 14 shows hysteresis curves (b) in various states where the spring performance when the laminated rubber bearing body is displaced in the horizontal direction is not good;
It is a graph which shows (c) and (d) in contrast with the hysteresis curve (a) in a good state.

[Explanation of symbols]

Reference Signs List 10 laminated rubber support 21 rubber layer 22 reinforcing plate 23 reinforcing plate (upper flange member) 24 reinforcing plate (lower flange member) 25 laminated rubber portion 33 mounting hole 35 lead (35A, 35B, 35C, 35D, 35)
E) 36 through-hole (opening) 60 structure 70 base (structure)

Claims (6)

[Claims] 1. A laminated rubber bearing body in which a rubber layer and a reinforcing plate are alternately laminated and integrated, and lead is disposed inside, wherein the lead is inserted into the rubber layer between adjacent reinforcing plates. A laminated rubber bearing, characterized by being arranged. 2. A laminated rubber bearing body in which a rubber layer and a reinforcing plate are alternately laminated and integrated, and lead is disposed therein, wherein a through hole is formed in a part of the reinforcing plate, The laminated rubber bearing body is disposed between the reinforcing plate having no through hole above and below the reinforcing plate having the through hole and the rubber layer and the inside of the through hole. 3. The laminated rubber bearing according to claim 1, wherein the lead is disposed inside all of the rubber layers. 4. The laminated rubber bearing according to claim 1, wherein the lead is disposed inside a part of the rubber layer. 5. The laminated rubber bearing according to claim 1, wherein the lead is disposed at a center of the laminated rubber bearing. 6. The laminated rubber bearing according to claim 1, wherein said lead is arranged at a plurality of positions symmetrical with respect to the center of the laminated rubber bearing.