JP2816344B2 - Laminated rubber bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method between a foundation and a building, between a slab and a flooring,
Alternatively, they are installed between the floor and precision equipment, and elastically support these structures to protect them from earthquake vibrations or to insulate or isolate them from external vibrations such as passing vehicles. The present invention relates to a laminated rubber bearing for supporting vibration isolation. [Prior art] In buildings built on a foundation or precision equipment installed on a mounting table, it may be required to minimize transmission of external vibrations caused by earthquakes, passing vehicles, etc. . In particular, in the case of structures requiring high security and precision, such as nuclear facilities, computers, semiconductor manufacturing apparatuses, and electron microscopes, it is required to cut off seismic motions having large vibrations over a wide frequency range from micro-vibrations. In order to respond to such a request, the laminated rubber bearing is used to elastically support the structure with respect to the base. This laminated rubber bearing for seismic isolation support has a structure in which layers of combs and other elastomeric materials and reinforcing plates such as metal plates and hard plastic plates are alternately and integrally laminated,
Usually, a flange plate having mounting holes at its upper and lower ends is integrally fixed by baking or the like. Such a laminated rubber bearing has a high spring constant in the vertical direction and a low spring constant in the horizontal direction, and has a ratio of the vertical and horizontal spring constants of the vertical and horizontal spring constants Kv and Kh. Kv
/ Kh is required to be 900 or more. In this type of conventional laminated rubber bearing, when used for low load support, the vibration absorption capacity is maintained by reducing the diameter or increasing the height, but in this case the buckling load And the deformability decreases. In view of such a problem, it has been proposed to reduce the height while maintaining a large diameter by making the laminated rubber into a hollow cylindrical shape. However, simply by forming a hollow cylindrical shape, the rigidity in the vertical direction (vertical direction) is significantly reduced, and the desired vertical and horizontal spring constant ratio Kv / K
There was a problem that h could not be maintained. Further, since the damping characteristic of the laminated rubber bearing body is only the internal viscosity damping action of the elastomer layer itself, there is also a problem that the vibration damping ability becomes too small. Therefore, the laminated rubber bearing body is formed into a hollow cylindrical shape, and a filler such as a liquid or a viscoelastic material is filled in the hollow portion to reduce the free surface area of the laminated rubber, thereby restraining the deformation of the laminated rubber. A structure for preventing an excessive decrease in the constant Kv and ensuring a vibration damping capability has been proposed in, for example, Japanese Patent Application Laid-Open No. Sho 62-215824. [Problems to be Solved by the Invention] However, in the above-described conventional structure in which a filler is filled in a hollow portion, the longitudinal spring constant Kv is effectively acted on and the longitudinal and lateral spring constant ratio Kv / Kh is reduced to a predetermined range. Although it can be increased, it is difficult to sufficiently increase the vibration damping force against low-frequency, large-amplitude vibration such as seismic force. The present invention has been made in view of the above prior art,
An object of the present invention is to reduce the internal loss by generating a plastic flow resistance due to the flow of the filler when the laminated rubber elastically deforms while maintaining a high ratio of the vertical and horizontal spring constants by increasing the vertical spring constant. It is an object of the present invention to provide a laminated rubber bearing body capable of improving the vibration damping ability by increasing the same, and at the same time, improving the absorbing ability of the high frequency micro vibration. [Means for Solving the Problem] The first aspect of the present invention is to form a hollow portion vertically penetrating a central portion of a laminated rubber obtained by alternately laminating an elastomer layer and a reinforcing plate, and forming the hollow portion. In the laminated rubber bearing body filled with a filler having a vibration damping capability due to internal loss, the hollow portion filled with the filler is sealed by upper and lower end plates fixed to upper and lower end surfaces thereof, and the filler is As a rubber, plastic, asphalt or a plastic body such as clay is used, a projection is provided on the upper and lower end plates to project to a height that leaves a predetermined height direction gap at a height direction substantially central portion of the hollow portion, and the protrusion is provided. When the filler flows due to the elastic deformation of the laminated rubber, the internal loss of the filler is increased by generating a plastic flow resistance due to the protrusion. This achieves the above object. According to a second aspect of the present invention, a hollow portion is formed which vertically passes through a central portion of a laminated rubber in which an elastomer layer and a reinforcing plate are alternately laminated and integrated, and the hollow portion has a vibration damping ability due to internal loss. In the laminated rubber bearing body filled with the filler, the hollow portion filled with the filler is sealed by upper and lower end plates fixed to the upper and lower end surfaces thereof, and a random wire mesh of raw rubber, steel wool as raw rubber is used as the filler. Or, a filler having a vibration damping ability due to internal loss embedded in a plurality of hollow cylindrical bias wire mesh of concentric arrangement is used, when the raw rubber flows due to elastic deformation of the laminated rubber, the random wire mesh, A configuration in which the internal loss of the filler is increased by generating plastic flow resistance due to relative movement with steel wool or a bias wire mesh. More, it is to achieve the above object. EXAMPLES The present invention will be specifically described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a laminated rubber bearing according to a first embodiment of the present invention, and FIG. 2 is a transverse sectional view taken along line II-II in FIG. In FIG. 1 and FIG. 2, a laminated rubber 3 formed by alternately laminating a plurality of elastomer layers 1 of a rubber-like elastic material and a plurality of reinforcing plates 2 of a metal plate or a hard plastic plate is integrated into a central portion. Has a hollow structure having a cavity 4. The hollow portion 4 of the laminated rubber 3 has an end plate 5
6 is fixed by baking or bonding or the like, but the inner surfaces of the end face plates 5 and 6, that is, the upper and lower surfaces of the hollow portion 4, leave a predetermined gap at a substantially central portion in the height direction in the hollow portion. Protrusions 7 and 8 are provided so as to protrude. The end plates 5 and 6 have overhang portions 5A,
It is fixed at a predetermined position using 6A, and for example, an attachment hole 11 is formed. A filler 9 is sealed in the hermetically sealed hollow portion 4. The filler 9 flows in the hollow portion 4 when the hollow laminated rubber 3 is deformed, but due to the plastic flow resistance received by the projections 7 and 8 at that time, the internal loss is maintained while maintaining the fine vibration absorbing performance. This is to improve the vibration damping ability. As the filler 9, a plastic such as rubber, plastic, asphalt, or clay, that is, a material exhibiting plastic flow resistance is used. Also, in the embodiment of FIGS. 1 and 2, the protrusions 7 and 8 are shaped like Mt. Fuji, but the shape of the protrusions can be selected from various other shapes. According to the embodiment described above, a hollow portion vertically penetrating the center portion of the laminated rubber 3 in which the elastomer layer 1 and the reinforcing plate 2 are alternately laminated and integrated is formed, and the hollow portion is caused by internal loss. In a laminated rubber bearing body filled with a filler having a vibration damping ability, the hollow portion 4 filled with the filler is sealed by upper and lower end plates 5 and 6 fixed to upper and lower end surfaces thereof. A plastic material such as rubber, plastic, asphalt or clay is used as 9, and the upper and lower end plates 5 and 6 are provided with the hollow portion 4.
Protrusions 7 and 8 are provided at approximately the center in the height direction to protrude to a height that leaves a predetermined clearance in the height direction. When the filler 9 flows due to elastic deformation of the laminated rubber 3,
8, the internal loss of the filler 9 is increased by generating a plastic flow resistance, so that the vertical and horizontal spring constant ratio Kv / Kh is maintained at a desired high value (for example, 900 or more) while the laminated rubber 3 is maintained. When the filler 9 is elastically deformed, the filler 9 flows and the plastic flow resistance due to the projections 7 and 8 is generated.
Provided is a laminated rubber bearing that can increase the internal loss and improve the vibration damping capability, and at the same time, can also enhance the high frequency microvibration absorption capability. It should be noted that the magnitude and frequency characteristics of the vibration damping ability can be appropriately adjusted in a wide range by selecting the material of the filler 9. FIG. 3 is a longitudinal sectional view of the laminated rubber bearing according to the second embodiment of the first invention, and FIG. 4 is a transverse sectional view taken along line IV-IV in FIG. The structure of the second embodiment differs from the structure of the first embodiment in that the projections 7 and 8 are hollow cylindrical, and the other parts are substantially the same. Parts corresponding to those in FIG. 2 are indicated by the same reference numerals, and detailed description thereof will be omitted. According to the illustrated second embodiment, similarly to the case of the above-described first embodiment, when the laminated rubber 3 is elastically deformed while maintaining the vertical and horizontal spring constant ratio Kv / Kh at a desired high value (for example, 900 or more). Since the filler 9 flows and the plastic flow resistance is generated by the projections 7 and 8, the internal loss can be increased and the vibration damping ability can be improved, and at the same time, the absorption capacity of high frequency micro vibration can be improved. A laminated rubber bearing is provided. Also in the present embodiment, the magnitude and frequency characteristics of the vibration damping ability can be appropriately adjusted in a wide range by selecting the material of the filler 9. In the illustrated embodiment, the case where the protrusions 7 and 8 are formed in the shape of Mt. Fuji and the case where the protrusions 7 and 8 are formed in the shape of a hollow cylinder are illustrated.
Can be freely selected into various shapes, as long as the plastic flow resistance is given. FIG. 5 is a longitudinal sectional view showing the structure of the embodiment of the laminated rubber bearing according to the second invention, and FIG. 6 is a line VI- in FIG.
FIG. 6 is a longitudinal sectional view along VI. In FIGS. 5 and 6, a laminated rubber 23 formed by alternately laminating a plurality of elastomer layers 21 made of rubber-like elastic material and a plurality of reinforcing plates 22 made of a metal plate or a hard plastic plate has a central portion. It has a hollow structure having a cavity (hollow portion) 24, and the cavity (hollow portion) is hermetically sealed by fixing end face plates 25 and 26 to the upper and lower end surfaces by baking or bonding. Thus, according to the second aspect of the present invention, the hollow material 24 is filled with the composite material 29 containing raw rubber. Raw rubber is a highly viscous plastic material and has almost no elasticity. Further, the viscosity and plasticity of the raw rubber are substantially constant, and the viscosity and the plasticity cannot be adjusted with the raw rubber alone. Therefore, it is difficult to adjust the magnitude of the damping capacity and the frequency characteristics to the use conditions. Thus, according to the second aspect of the present invention, a composite material having a vibration damping ability due to internal loss by embedding another member in raw rubber is used as the filler 29 sealed in the hollow portion 24. . As other members embedded in the raw rubber, a random wire mesh, steel wool, or a plurality of hollow cylindrical bias wire meshes arranged concentrically is used. That is, when the raw rubber flows in the hollow portion 24 due to the elastic deformation of the laminated rubber 23, the filler 29 moves relative to the random wire mesh, steel wool or bias wire mesh with respect to the movement of the raw rubber. Owing to the plastic flow resistance, thereby increasing the internal loss of the filler and exhibiting a better vibration damping ability. FIG. 7 is a schematic view showing a specific example of the composite material 19. As shown in FIG. FIG. 7 (A) shows a filler 29 obtained by adding random wire mesh or steel wool to raw rubber. By mixing (embedding) such a wire- or non-woven metal fiber, the longitudinal spring constant can be maintained even at low load.
While maintaining Kv at a high value, when the raw rubber flows through the hollow portion 24 due to the elastic deformation of the laminated rubber 23, plastic flow resistance is generated against the movement of the raw rubber, thereby increasing the internal loss of the filler 29. And thereby exhibit excellent vibration damping ability. At the same time, the microvibration absorption performance can be improved. FIG. 7 (B) shows a filler 29 having a structure in which a plurality of concentric hollow cylindrical bias wire nets are embedded in raw rubber. According to the second embodiment of the present invention described above with reference to FIGS. 5 to 7, a composite material obtained by combining an adjusting material such as a wire netting with raw rubber exhibiting high viscosity and plasticity is used as a filler,
Since this was sealed in the hollow portion 4 to form a laminated rubber bearing body having a hollow structure, the following effects could be achieved. (I) First, since the filler 29 is sealed in the hollow part 24, the free surface area of the hollow laminated rubber 23 is reduced, and the vertical and horizontal spring constant ratio Kv / Kh is maintained at a desired high value (for example, 900 or more). As a result, a laminated rubber bearing body capable of producing a sufficient damping action even at the time of minute deformation was obtained. (Ii) Since a composite material combining raw rubber and a plasticity adjusting material such as metal is used as the filler 29, the laminated rubber
When the raw rubber flows through the hollow portion 24 due to the elastic deformation of 23, plastic flow resistance can be generated against the movement of the raw rubber, and the internal loss of the filler 29 can be increased. The vibration damping ability can be further improved. FIG. 8 to FIG. 11 are diagrams illustrating the usage status of the laminated rubber support described above. FIGS. 8 and 9 are side views of the case where the laminated rubber bearing members 50 are used alone and the structures 60 such as buildings, devices and equipment are elastically supported on a base 70 such as a foundation or floor one by one. It is a figure and a top view. FIGS. 10 and 11 show a multi-stage assembly in which the upper and lower end surfaces of a plurality of (four in the illustrated example) laminated rubber supports 50 are connected by a stabilizer plate 80 over a plurality of stages (for example, 5 to 10 stages). Side view and plan view in the case of using a seismic unit 100 and elastically supporting a structure 60 such as a building, an apparatus, or an apparatus on a base 70 such as a foundation or a floor via the multi-stage seismic isolation unit 100. It is. [Effects of the Invention] As is apparent from the above description, according to the first aspect of the present invention, the hollow portion vertically penetrating the center of the laminated rubber in which the elastomer layers and the reinforcing plates are alternately laminated and integrated is formed. In the laminated rubber bearing body formed and filled with a filler having a vibration damping ability due to internal loss in the hollow portion, the hollow portion filled with the filler is formed by upper and lower end plates fixed to upper and lower end surfaces thereof. It is sealed, and a plastic body such as rubber, plastic, asphalt or clay is used as the filler, and protrudes to a height that leaves a predetermined gap in the height direction substantially at the center of the hollow portion in the upper and lower end plates in the height direction. A protrusion is provided, and when the filler flows due to elastic deformation of the laminated rubber, the internal loss of the filler is increased by generating a plastic flow resistance due to the protrusion. Since the vertical spring constant is increased and the vertical and horizontal spring constant ratio is maintained at a high value, the plastic rubber is elastically deformed to generate plastic flow resistance due to the flow of the filler due to the flow of the filler. Provided is a laminated rubber bearing that can increase the internal loss and improve the vibration damping capability, and at the same time, can also enhance the high frequency microvibration absorption capability. According to the second aspect of the present invention, a hollow portion is formed which vertically passes through a center portion of a laminated rubber in which an elastomer layer and a reinforcing plate are alternately laminated and integrated, and the hollow portion has a vibration damping capability due to internal loss. In the laminated rubber bearing body filled with a filler having, the hollow portion filled with the filler is sealed by upper and lower end plates fixed to upper and lower end surfaces thereof,
As the filler, a random wire netting in raw rubber, steel wool, or a filler having a vibration damping ability due to internal loss embedded with a plurality of hollow cylindrical bias wire nets arranged in a concentric arrangement is used, and the elastic rubber deforms the laminated rubber. When the raw rubber flows, the random wire mesh, steel wool, or a structure that increases the internal loss of the filler by causing plastic flow resistance due to relative movement with the bias wire mesh, so that the longitudinal spring constant is increased. While maintaining the vertical and horizontal spring constant ratio at a high value, when the laminated rubber is elastically deformed, the raw rubber flows in the hollow portion and plastic flow resistance is generated by the embedded member such as the wire mesh, so that the inside of the filler is By increasing the loss, the vibration damping ability can be improved, and at the same time, the absorption capacity of high frequency micro vibration can be improved. Layer rubber bearings is provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of one embodiment of a laminated rubber bearing according to the first invention, FIG. 2 is a transverse sectional view taken along line II-II in FIG. FIG. 3 is a longitudinal sectional view of another embodiment of the laminated rubber bearing according to the first invention, FIG. 4 is a transverse sectional view taken along line IV-IV in FIG. 3, and FIG. FIG. 6 is a longitudinal sectional view of the basic structure of the present invention, FIG. 6 is a transverse sectional view taken along line VI-VI in FIG.
7 (A) and 7 (B) are each a schematic perspective view illustrating the type of the filler in FIG. 5, FIG. 8 is a side view illustrating a state in which the laminated rubber bearing is used alone, FIG. 9 shows the eighth
FIG. 10 is a plan view, and FIG. 10 is a side view illustrating a state where the laminated rubber bearing body is assembled and used as a multi-stage seismic isolation unit.
The figure is a plan view of FIG. 1, 21 ... elastomer layer, 2, 22 ... reinforcing plate, 3, 23
... Laminated rubber, 4, 24 ... Hollow part, 5 ... End face plate, 6 ... End face plate, 7, 8 ... Protrusion, 9, 29 ...
Filler, 50 …… Laminated rubber bearing, 60 …… Structure, 70 ……
Base, 100 ... Multi-stage seismic isolation unit.

Claims (1)

(57) [Claims] A laminate in which an elastomer layer and a reinforcing plate are alternately laminated and integrated into a laminated rubber, and a hollow portion penetrating vertically through a central portion of the laminated rubber is formed, and the hollow portion is filled with a filler having a vibration damping ability due to internal loss. In the rubber bearing body, the hollow portion filled with the filler is sealed by upper and lower end plates fixed to the upper and lower end surfaces thereof, and a rubber such as rubber, plastic, asphalt or clay is used as the filler, The upper and lower end plates are provided with projections projecting to a height that leaves a predetermined height direction gap substantially at the center in the height direction of the hollow portion, and when the filler flows due to elastic deformation of the laminated rubber, A laminated rubber bearing, wherein the internal loss of the filler is increased by causing plastic flow resistance due to the projections. 2. A laminate in which an elastomer layer and a reinforcing plate are alternately laminated and integrated into a laminated rubber, and a hollow portion penetrating vertically through a central portion of the laminated rubber is formed, and the hollow portion is filled with a filler having a vibration damping ability due to internal loss. In the rubber bearing body, the hollow portion filled with the filler is sealed by upper and lower end plates fixed to the upper and lower end surfaces thereof, and a random wire mesh of raw rubber, steel wool,
Alternatively, a filler having vibration damping ability due to internal loss embedded in a plurality of hollow cylindrical bias wire meshes concentrically arranged is used, and when the raw rubber flows due to elastic deformation of the laminated rubber, the random wire mesh, steel wool,
Alternatively, the laminated rubber bearing body increases the internal loss of the filler by generating plastic flow resistance due to relative movement with a bias wire net.