JP2983946B2 - Restoration / attenuation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a restoration / damping device using a seismic isolation rubber body used for a seismic isolation structure, and more particularly, to a restoration / attenuation device in which a lead plug is inserted into a through hole of the seismic isolation rubber body. It relates to a damping device.

[0002]

2. Description of the Related Art Conventionally, as a seismic isolation device used for a seismic isolation structure, there is a device using a seismic isolation rubber body. This device is
For example, it is constructed by inserting a lead plug into the center hole of a cylindrical seismic isolation rubber body in which a steel plate and a rubber layer are laminated. It is an integrated seismic isolation device that is responsible for the restoration mechanism and the lead plug is responsible for the damping mechanism, and is widely applied to various seismic isolation structures.

[0003]

However, in the seismic isolation device using the seismic isolation rubber body, the lead plug inserted into the center hole penetrates and is connected to the upper and lower flange plates. There is a problem when used with an insulating support device whose height dimension does not change. In other words, when a large deformation occurs during a large earthquake or the like, the lead plug in the center hole is stretched by pulling because the shear deformation is forced while maintaining the vertical relative height. Also,
When the lead plug is restored from the expanded state, the lead plug is in a compressed state, and the internal stress may adversely affect the deformation characteristics and mechanical characteristics of the restoration / damping device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the lead plug does not expand due to bending deformation even when subjected to large deformation. It is an object of the present invention to provide a restoring / damping device in which internal stress is less likely to remain in a seismic isolation rubber body, and deformation characteristics and mechanical characteristics are not changed.

[0005]

In order to achieve the above object, a restoration / damping device according to the present invention comprises: a pair of end plates; a seismic isolation rubber member connected between the end plates; And a continuous through hole in the seismic isolation rubber body.
For a restoration / attenuation device composed of the provided lead plug
The lead plug has two independent portions each having one end fixed to each of the end plates and the other end inserted into the through hole.
It is composed of a minute that the intermediate portion is partitioned
Features .

The seismic isolation rubber member is characterized in that its outer periphery is covered with a covering rubber layer, and the seismic isolation rubber member is connected to a pair of flange plates via end plates connected to both ends thereof. And a pair of flange plates sandwiching a lead plug, the seismic isolation rubber body may be a laminated rubber body in which a rubber layer and a steel plate are laminated, and the seismic isolation rubber body is made of a high damping rubber. It may be configured.

The through hole may be formed by penetrating through the seismic isolation rubber body from the upper and lower surfaces of the end plate. The lead plug may be configured to be in contact with the bottom surface of the bottomed hole. The lead plug may have a hemispherical shape or a mountain shape at its tip, and may have a tapered shape at the root of its head.

In the restoration / attenuation device using the seismic isolation rubber body configured as described above, two independent lead plugs are inserted into the through holes in the seismic isolation rubber body from the respective end plates. Even when the rubber body undergoes large deformation, the lead plug does not stretch, and when restored, the internal stress rarely remains in the lead plug, and the deformation characteristics and mechanical characteristics do not change. It is easy to insert the lead plug into the through hole of the seismic isolation rubber body, making it easy to manufacture, and since the lead plug has good restorability, the seismic isolation performance is improved.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a cross-sectional view of an embodiment of a restoration / attenuation device according to the present invention, and FIG. 1B is a front view of a lead plug. In FIG. 1, a restoration / damping device 10 as a seismic isolation device used for a seismic isolation structure includes an upper flange plate 12 attached to an upper structure, and a lower flange 14 plate attached to a lower structure such as a foundation. During this time, the seismic isolation rubber body 16 is connected to the plurality of set screws 1 via the pair of end plates 17, 17.
8 is fixed. The seismic isolation rubber body 16 has a cylindrical shape, is connected between the pair of end plates 17, 17, and has a central hole 19 a which is a through hole continuously penetrating the end plates and the seismic isolation rubber body 16. Rubber body 19 with holes
It is composed of Then, one ends of the two independent lead plugs 20, 20 are fixed to the upper and lower end plates 17, 17,
The other end is inserted into the center hole 19a. Further, the seismic isolation rubber body 16 has a cylindrical outer periphery covered with a covering rubber layer 22.

In the present embodiment, the seismic isolation rubber body 16 has end plates 17 and 17 embedded above and below a rubber body 19 made of high-attenuation rubber, and the outer covering rubber layer 22 is protected from deterioration of the rubber due to ozone and ultraviolet rays. This is to prevent it from reaching inside. Stepped holes 17a, 17a are provided at the centers of the end plates 17, 17.
A lead plug 20 having a T-shaped cross section is inserted through the center hole 19a from the stepped hole, and the lead plug 2
0 and 20 are upper and lower flange plates 12 and 14 and end plates 17 and 1.
7. The end plates 17, 17 and the rubber body 19 may be configured to be fixed by vulcanization bonding or the like.

The length L1 of the lead plugs 20, 20 is
7, the thickness H2 is 0.1 to 0.5 of the height H1 of the rubber body 19.
It is set to a length that is about twice as long as the center hole.
The center of 9a is hollow. For this reason, the lead plugs 20, 20 can freely expand and contract without being subjected to an axial restraining force by the seismic isolation rubber body 16. Lead plug 2
The diameter d2 of the pins 0 and 20 is about 0.9 to 1 times the inner diameter D2 of the center hole 19a or 0.20 times the diameter D1 of the rubber body 19.
It is set to about 2 to 0.4 times, and is loosely inserted into the center hole 19a or inserted in a press-fit state. Lead plug 2
The diameter d1 of the heads 0 and 20 is set to be about 1 to 3 times the diameter D2 of the center hole 19a.
The height L2 of the head 20 is 0.5 to 0.5 of the thickness H2 of the end plate 17.
It is set to about 1 time. And lead plugs 20, 2
0, the top and bottom flange plates 12, 14 and the end plate 17,
17 and is firmly held between them.

As described above, the restoring / damping device of the present invention is composed of a single layer of high-damping rubber and supports only a slight vertical load, but is sufficient when the rigidity in the horizontal direction is kept small. It has excellent deformation and damping performance. Therefore, it is suitable for a restoration / damping device for an ultra-long period structure, a lightweight structure, a seismic isolation floor, and the like.

This embodiment has the above configuration, and the operation will be described below with reference to FIG. When an earthquake or the like occurs, the lower flange plate 14 fixed to the lower structure such as the foundation moves with the earthquake with respect to the upper flange plate 12 fixed to the upper structure, as shown in FIG. Displace. That is, the lower flange plate 14 and the upper flange plate 1
2 moves in parallel while maintaining the vertical height, and the middle seismic isolation rubber body 16 is bent and expanded. At this time, the lead plugs 20, 20 are bent with the displacement of the upper and lower flange plates 12, 14, but do not expand because the intermediate portion is cut off. In this manner, the energy of the earthquake is attenuated and absorbed by the seismic isolation rubber body 16, in other words, the rubber body 19.
The seismic energy is attenuated and absorbed by the deformation caused by the bending and extension of the lead plugs and the bending of the lead plugs 20, 20.

When the vibration of the earthquake subsides, the restoration / damping device 10
1 returns to the state shown in FIG. 1. However, since the lead plugs 20 and 20 are not stretched, the lead plugs 20 and 20 are easy to return, and unnecessary internal stress due to compression at the time of return as in the related art does not remain.
When manufacturing the restoration / attenuation device 10, the lead plug 2
Numerals 0 and 20 are inserted into the center hole 19a of the rubber body 19 from above and below, and the total length thereof is smaller than the total length of the seismic isolation rubber body 16 so that the insertion is easy, and a single long length as in the prior art is used. Manufacturing is extremely easy as compared with press-fitting of a lead plug.

Next, another embodiment of the present invention will be described with reference to FIG. 3A and 3B are cross-sectional views of another embodiment of the present invention. In FIG. 3A, the seismic isolation rubber body 26 of the restoration / damping device 25 is provided with center holes 29a, 29b having bottoms from upper and lower sides continuously extending from the end plates 17, 17 to the rubber body 29. In the hole
Two independent lead plugs 20, 20 are inserted, the bottom surface of which is in contact with the bottom surface of the center hole. In this embodiment, since the lead plugs 20, 20 receive an axial restraining force in the rubber body 29, the yield strength of lead can be ensured.

In FIG. 3B, the restoration / attenuation device 30
Is composed of a laminated rubber body 39 in which a plurality of steel plates 39a and a plurality of rubber layers 39b are laminated, and is provided in a center hole 39c which continuously penetrates the end plates 17, 17 and the laminated rubber body 39. Two independent lead plugs 20 from above and below
0 is inserted. In this embodiment, the seismic isolation rubber member 36 is composed of the laminated rubber member 39, so that the cost is slightly increased. However, the restoration / attenuation device 30 can support in the vertical direction. In addition, about the structure substantially equivalent to the said embodiment, the same referential mark is attached | subjected and detailed description was abbreviate | omitted.

Referring to FIG. 4, another embodiment of the lead plug will be described. FIG. 4 is a front view of another embodiment of a lead plug. (A) is a lead plug 41 having a T-shaped cross section, and has a hemispherical tip, and is connected to the end plate 17. (B) is a T-shaped lead plug 42,
The tip shape is mountain-shaped. In this case, there is an effect that the insertion into the center hole becomes easy as compared with the above-described embodiment.
(C) is a lead plug 43 having a tapered head base.
The tip shape is hemispherical, and is connected to the end plate 17. In this case, a stepped tapered hole is formed in the end plate 17. (D) is a lead plug 44 having a tapered root at the root of the head and a mountain-shaped tip. (E) is a lead plug 45 having a tapered root at the base of the head and a flat tip. If the root of the head is tapered, the connection with the end plate becomes strong and the root is less likely to be cut due to a large earthquake, etc. This has the effect of facilitating insertion.

Although the example in which the center hole of the laminated rubber body is penetrated has been described, it is needless to say that the center hole may also be a bottomed center hole formed vertically without penetrating the center hole. In addition, although an example in which one center hole is used as the through hole has been described, a plurality of through holes may be provided from above and below, and a plurality of lead plugs may be inserted. Furthermore, although the restoration / damping device according to the present invention is configured to be connected to the building structure by the flange plate, the end plate may be directly connected to the building structure to form a seismic isolation device.

[0019]

As described above, according to the present invention,
The restoration / attenuation device is easy to restore because the lead plug does not stretch even if it is greatly deformed due to an earthquake or the like. Deformation characteristics and mechanical characteristics do not change. Therefore, seismic isolation performance can be stabilized. Further, it is easy to insert the lead plug into the through hole of the seismic isolation rubber body, and it is possible to manufacture a restoration / attenuation device that is easy to manufacture and has stable seismic isolation performance.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of one embodiment of a restoration / attenuation device according to the present invention, and FIG. 1B is a front view of a lead plug.

FIG. 2 is a cross-sectional view showing an operation state of an embodiment of the restoration / attenuation device according to the present invention.

FIG. 3 (a) is a cross-sectional view of another embodiment of the restoration / attenuation device, and FIG. 3 (b) is a cross-sectional view of still another embodiment of the restoration / attenuation device.

FIGS. 4A to 4E are front views of other embodiments of a lead plug, respectively.

[Explanation of symbols]

10, 25 , 30 Restoring / damping device 12 Upper flange plate 14 Lower flange plate 16, 26, 36 Seismic isolation rubber body 17, 17 End plate 17a, 17a Stepped hole 18 Set screw 19, 29 Rubber body 19a, 29a, 29b , 39c Center hole 20, 20 Lead plug 22 Coated rubber layer 39 Laminated rubber body 39a Steel plate 39b Rubber layer 41, 42, 43, 44, 45 Lead plug

Continuation of the front page (56) References JP-A-8-326840 (JP, A) JP-A-2-176229 (JP, A) JP-A-62-155344 (JP, A) JP-A-6-272426 (JP) , A) JP-A-9-210122 (JP, A) JP-B-7-49733 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16F 15/02-15/08 F16F 7/00 E04H 9/02

Claims (10)

(57) [Claims] 1. A pair of end plates and a connection between these end plates
The seismic isolation rubber body and the end plate and the
Through holesA lead plug provided in this through hole
In the restoration and attenuation device composed of The lead plug, One end is fixed to each of the end plates
The other two independent ends are inserted through the through holespartAnd from
ComposedThe middle part is divided
ToRestoration / attenuation device. 2. The restoring / attenuating device according to claim 1, wherein an outer periphery of the seismic isolation rubber body is covered with a covering rubber layer. 3. The seismic isolation rubber body is connected to a pair of flange plates via end plates connected to both ends thereof, and the lead plug is sandwiched between the end plates and the pair of flange plates. 3. The restoration / attenuation device according to claim 1 or 2, wherein: 4. The restoration / attenuation device according to claim 1, wherein the seismic isolation rubber body is a laminated rubber body in which a rubber layer and a steel plate are laminated. 5. The restoration / attenuation device according to claim 1, wherein the seismic isolation rubber body is made of high attenuation rubber. 6. The restoring / attenuating device according to claim 1, wherein the through hole is penetrated from the upper and lower surfaces of the end plate into the seismic isolation rubber body. 7. The through hole is a bottomed hole formed in the seismic isolation rubber body from the upper and lower surfaces of the end plate, and the lead plug is in contact with the bottom surface of the bottomed hole. A restoration / attenuation device according to any one of claims 1 to 5. 8. The restoration plug according to claim 1, wherein the lead plug has a hemispherical tip.
Damping device. 9. The restoration / attenuation device according to claim 1, wherein the tip of the lead plug has a mountain shape. 10. The restoration / attenuation device according to claim 1, wherein the root of the lead plug has a tapered shape.