JP2000283225A - Elastic support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure predetermined energy absorption characteristic for a long time by providing a hole extending in the vertical direction inside a support body constituted by laminating an elastic material layer and a rigid material layer alternately in the vertical direction and sealing many particlelike bodies for damping in this hole in a device provided with the support body. SOLUTION: In an elastic support device 1 which is provided with upper and lower part mounting plates 2, 3 and a support body 6 and is provided between an upper structure 4 and a lower structure 5 through the upper and lower part mounting plates 2, 3, the whole support body 6 is formed like a circular column, and a hole 8 is formed in its central part. Moreover, the support body 6 is constituted by laminating a rubber layer 9 which is an annular elastic material layer, reinforcing plates which are rigid material layers for constraining the swollenout of laminated rubber, so-called thick-walled upper and lower part reinforcing plates 10, 11 and a thin-walled intermediate reinforcing plate 12 alternately. Many particlelike bodies 7 and a filler made of silicon putty for filling up a clearance between each particlelike body 7 are filled in the hole 8, and a bottom part and an upper part of the hole 8 are closed by steel lids 22, 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic bearing device, and more particularly to a structure of a bearing device in which a damping member is incorporated in a bearing body to absorb vibration energy such as an earthquake.

[0002]

2. Description of the Related Art Conventionally, a laminated rubber bearing in which a lead plug is sealed in a laminated rubber in which a rubber layer and a reinforcing plate are alternately laminated in the vertical direction absorbs vibration energy during an earthquake, It is widely known as a damping seismic isolation bearing device. The lead plug used in this laminated rubber bearing is shear-deformed with the horizontal deformation of the laminated rubber when the upper structure and the lower structure cause relative displacement during an earthquake,
It exhibits energy absorption characteristics.

[0003] However, the above-described conventional laminated rubber bearing containing lead plugs has the following problems. (1) Lead may bite into the rubber layer during shear deformation, causing harmful damage that affects durability, or the expected attenuation may not be obtained due to abnormal deformation of the lead plug. (2) The lead plug is press-fitted into a hole formed in the laminated rubber. However, there is difficulty in press-fitting, and therefore, the performance tends to vary. (3) Since the lead plug is expected to recover and recrystallize at room temperature after repeatedly undergoing shear deformation, its purity is 99.99%.
Requires pure lead.

(4) After performing a large shear deformation test using a real rubber bearing, when the rubber bearing is cut in the axial direction of the lead plug, the lead plug is divided at a plurality of locations in the radial direction, and the abacus It had a shape like stacked balls. Thus, it is considered that the lead plug draws out the attenuation not by plastic bending deformation but by friction acting between the abacus ball-shaped lead blocks. (5) The recovery and recrystallization of the lead plug at room temperature can be expected as long as the shear deformation is small and the lead plug can be flexibly deformed. Therefore, when the lead plug is in the shape of an abacus, the friction surface is oxidized, and expected recovery and recrystallization cannot be expected. (6) If a large number of shear deformations are experienced, lead becomes ragged and the damping performance is extremely reduced.

[0005]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above technical background, and has the following objects.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem of using a lead plug by incorporating a damping member different from that of a lead plug, and to obtain an elasticity capable of obtaining desired energy absorption characteristics over a long period of time. It is to provide a bearing device.

[0007]

The inventors of the present invention have come up with the following idea based on the results of the above-mentioned shear test. (1) Since lead plugs become abacus balls when subjected to large shear deformation, they need not necessarily be plugs. (2) Since recovery and recrystallization at normal temperature cannot be expected, it is not necessary to use high-purity lead, and it is not necessary to use lead itself. (3) If the same frictional force is generated when acting between the abacus ball-shaped lead blocks, the same damping as the plug can be obtained.

The present invention has been completed based on the above idea, and employs the following means.

That is, according to the present invention, in a resilient bearing device provided with a support body in which elastic material layers and rigid material layers are alternately laminated in a vertical direction, a hole extending in a vertical direction is provided inside the support body. The elastic bearing device is characterized in that a number of damping particles are sealed in the holes.

The elastic bearing device is installed between the upper structure and the lower structure, and the load of the upper structure is transmitted to the lower structure via the support. When an oscillating force is input to the lower structure during an earthquake, the upper and lower structures are relatively displaced in the horizontal direction, and the bearing undergoes elastic shear deformation in accordance with this. Periodically transmits to the superstructure, and performs seismic isolation. On the other hand, when the laminate is subjected to shear deformation, the group of granular materials enclosed therein also undergoes shear deformation. Due to this shearing deformation, each granular material rotates and generates friction between the granular materials, and a damping action by the friction is obtained. That is, the damping effect of the device according to the present invention is not due to plastic deformation as in the lead plug, but mainly to friction.

[0011] The particulates that generate friction include lead,
Metals or alloys such as steel, stainless steel, copper, aluminum, and zinc can be used, and synthetic materials such as plastics, bakelite, and ceramics can also be used. When lead is used, lead alloy is not required since recovery and recrystallization at room temperature are not expected unlike lead plugs. The size of the granular material is preferably about 0.1 mm to 20 mm in diameter. If the granular material is made of lead or a lead alloy, it can be melted by frictional heat and the molten surface can be oxidized.However, the molten surface peels off due to shear deformation and causes friction, so the damping force decreases. There is no.

If only the particles are sealed in the holes, voids are generated between the particles. For this reason, the granular material group is compacted by the behavior at the time of shear deformation, and as a result, the bulk volume is reduced,
It is also conceivable that the frictional force based on the vertical load decreases and the desired damping force cannot be obtained. Therefore, the holes are preferably filled with a filler to fill the voids.

As the filler, a metal powder such as a lead powder, or a diant fluid such as silicon putty (modified body obtained by adding boron to a methyl silicon rubber) can be used. The latter diluent fluid is a type of non-Newtonian fluid in which the apparent viscosity increases with increasing shear rate among pure viscous fluids. Therefore, this fluid has a small shear rate for slow motion and exhibits fluidity, and in the case of motion due to an impact force, the fluid acts as a rigid body without flowing at a large shear rate.

The particles can be prevented from diffusing into the elastic material layer by constraining the group of particles, and a constraining member for that purpose is provided on the elastic material portion on the outer periphery of the group of particles.
It is buried so as to surround the group of granular materials. The restraining member is a member that can be deformed in the horizontal direction in accordance with the shear deformation of the support body, and can be configured by, for example, a coil spring.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an elastic bearing device according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. The elastic bearing device 1 includes upper and lower mounting plates 2 and 3 and a support body 6, and is installed between the upper structure 4 and the lower structure 5 via the upper and lower mounting plates 2 and 3. Here, the lower structure 5 is, for example, a concrete foundation constructed on the ground, and the upper structure 4 is a middle-to-high-rise building.

In the present embodiment, the support body 6 has a columnar shape as a whole, and a hole 8 is formed at the center thereof. The support body 6 is formed by alternately laminating a rubber layer 9 which is an annular elastic material layer, and reinforcing plates which are rigid material layers, that is, thick upper and lower reinforcing plates 10 and 11 and a thin intermediate reinforcing plate 12. These rubber layers 9 and reinforcing plates 10, 11,
12 is integrated by vulcanization adhesion. Reinforcement plates 10, 1
Reference numerals 1 and 12 denote members for restricting the swelling of the laminated rubber when the load of the upper structure 4 is received, thereby preventing the elastic bearing device 1 from being compressed and deformed.

As a material of the rubber layer 9, natural rubber, silicone rubber, high attenuation rubber, urethane rubber, chloroprene rubber, or the like can be used. Also, the reinforcing plates 10, 11,
As the material of No. 12, a steel plate, ceramics, plastics, FRP, carbon fiber or the like can be used.

According to the present invention, a large number of granular materials 7 are sealed in the holes 8. Further, the holes 8 are filled with a metal powder such as lead powder or a filler 26 (see FIG. 3) made of silicon putty or the like to fill gaps between the granular materials. At the bottom and top of the hole 8 are steel lids 22,2.
3 are provided. After filling the granular material 7 and the filler 26, the upper part of the hole 8 is closed by the lid 22.

A coil spring 13 as a restraining member is embedded in the cylindrical portion 24 so as to surround the group of granular materials 7. The coil spring 13 is installed with no load in the tension and compression directions. Coil spring 13
Is made of durable stainless steel or spring steel, but may be made of reinforcing fibers.

The upper and lower mounting plates 2 and 3 are made of a disk-shaped steel plate, and have a boss hole 15 with a bottom at the center. The bottomed boss hole 1 is also provided at the center of the upper and lower reinforcing plates 10 and 11 of the support body 6.
The shear key 17 is fitted into these boss holes 15 and 16. The upper and lower reinforcing plates 10 and 11 are provided with a plurality of bolt holes 18, and the support body 6 and the upper and lower mounting plates 2 and 3 are integrally connected by mounting bolts 19 screwed into the bolt holes 18. You. A plurality of bolt holes 20 are formed in the upper and lower mounting plates 2 and 3.
The upper and lower mounting plates 2 are mounted to the upper and lower structures 4 and 5 via the anchor bolts 21 screwed to the upper and lower structures.

The elastic bearing device 1 is manufactured generally as follows. The cylindrical portion 24 that defines the hole 8 is
The cylindrical part 24 is formed by unvulcanized or semi-vulcanized separately. At this time, the coil spring 13 is embedded in the tubular portion 24. In the molding die, an annular rubber layer 9 and a reinforcing plate 10,
11 and 12 are laminated. As a result, the hole 1 was placed at the center of the laminate.
4 are formed. The cylindrical portion 24 is inserted into the hole 14, and the rubber layer 9, the reinforcing plates 10, 11, 12 and the cylindrical portion 24 are inserted.
Is vulcanized and adhered to obtain a support body 6. A coating 25 made of a rubber material having good weather resistance may be provided on the outer periphery of the rubber layer 9 and the reinforcing plates 10, 11, 12.

The bottom lid 23 is attached to the hole 8, the granular material 7 and the filler 26 are filled, and the bottom lid 23 is closed with the upper lid 22. Boss hole 1
The shearing key 17 is attached to 5, 5 and the upper and lower mounting plates 2 and 3 are fixed to the reinforcing plates 10 and 11. The ratio of the volume of the hole 8 to the volume of the granular material 7 and the filler 26 is 1/1, and the hole 8 is completely filled. Therefore, the load of the upper structure 4 acts on the group of granular materials 7.

Next, the operation of the elastic bearing device 1 will be described with reference to FIG.
This will be described with reference to FIG. The load of the upper structure 4 is transmitted to the lower structure 5 via the bearing 6. When the vibration force F is input to the lower structure 5 during the earthquake, the upper and lower structures 4, 5
Are relatively displaced in the horizontal direction, and the bearing body 6 undergoes elastic shear deformation in accordance with the horizontal displacement. Eggplant On the other hand, the granular material 7
The group also undergoes shear deformation as a whole, and due to this shear deformation,
Each granular material rotates and generates friction between the granular materials, and a damping action due to the friction is obtained.

At the time of the above-mentioned shear deformation of the support body 6, the coil spring 13 also follows and deforms in the horizontal direction. At this time, the coil spring 13 extends in synchronism with the horizontal extension of the support 6, so that the coil spring 13 always surrounds the group of granules 7 over the entire length thereof. . That is, the group of granular materials 7 is constantly constrained by the coil spring 13, and therefore, even when subjected to repeated shear deformation, the reinforcing plates 10, 11,
The particles 12 do not bite into the granular material 7 group, and the diffusion of the granular material 7 group into the rubber layer is prevented.

In the above embodiment, the columnar bearing device is shown, but the shape of the bearing device may be a prismatic shape. In this case, a plurality of holes may be provided in the support at appropriate intervals, and a granular material may be sealed in each of these holes.

[0026]

As described above, according to the present invention, the damping effect is obtained mainly by friction of the granular material, instead of expecting the damping action due to plastic deformation unlike the conventional lead plug. Even when subjected to shear deformation, the desired energy absorption characteristics can be obtained over a long period of time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is an enlarged view of a granular material.

FIG. 4 is an operation explanatory view.

[Explanation of symbols]

 1: Elastic bearing device 2: Upper mounting plate 3: Lower mounting plate 4: Upper structure 5: Lower structure 6: Bearing 7: Granular material 8: Hole 9: Rubber layer 10: Upper reinforcing plate 11: Lower reinforcing plate 12: Intermediate reinforcing plate 13: Coil spring 17: Shear key 26: Filler

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J048 AA02 AC02 AD05 BA08 BE14 BF04 DA01 EA38 3J059 BA01 BA43 BB09 BD01 BD05 GA42

Claims (4)

[Claims] 1. An elastic bearing device comprising a support body in which elastic material layers and rigid material layers are alternately laminated in a vertical direction, wherein a hole extending in a vertical direction is provided inside the support body. An elastic bearing device in which a number of granular materials for damping are enclosed. 2. The elastic bearing device according to claim 1, wherein the gaps between said granular bodies are filled with a filler. 3. The elastic bearing according to claim 1, wherein a cylindrically deformable cylindrical restraining member surrounding the group of granular bodies is embedded in the elastic material portion on the outer periphery of the group of granular bodies. apparatus. 4. The elastic bearing device according to claim 3, wherein said restraining member is a coil spring.