JPH0647148Y2 - Steel rod damper - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a seismic isolation device for attenuating seismic energy, which is installed in the foundation of a structure.
The present invention relates to the structure of a steel rod damper that supports an elastoplastic body.

(Prior Art) In general, as a measure against earthquakes, many seismic isolation structures have recently been proposed in the construction industry. Unlike conventional earthquake countermeasures, which prevent earthquake damage by increasing the seismic strength of the building, this is to prevent earthquake damage to the building by attenuating the energy of the propagating earthquake.

Therefore, as proposed, for example, as shown in FIGS. 7 (a) and 7 (b), an elastic body 22 such as rubber and a stainless steel plate are provided between the bottom portion 20a of the structure 20 and the foundation 21. Of the metal plates 23 are alternately laminated to form the support 24 for supporting the structure 20, and the bottom 20a and the foundation 21 are provided with bearings 25, 25 ... 26 is formed and fixed, a steel rod 27 is inserted into the bearing portions 26, 26, and a damping device 28 is attached to the end portion 27a of the steel rod 27 so that the end portion 27a is rotatable and slidable. Are known.

With this seismic isolation device 29, when an earthquake occurs, the rolling energy of the seismic isolation device 29 is spent on the plastic deformation of the steel rod 27 of the damping device 28, so that the structure 20 is damaged by the rolling motion of the earthquake. To prevent the

(Problems to be solved by the invention) By the way, in the above-described conventional seismic isolation structure for the building 20, since the steel rod 27 of the damping device 28 is plastically deformed, it is necessary to replace it. Bearing part 26,2
It often takes time to dismantle 6, etc., and there was a drawback that vertical vibration energy could not be attenuated.

The object of the present invention is made in view of the above-mentioned drawbacks, and in the damping device of the seismic isolation device, it is possible to easily perform the replacement work of the deformed steel rod by absorbing the rolling energy during the earthquake.
Moreover, it is an object of the present invention to provide a steel rod damper for a seismic isolation device that exhibits excellent restoring force characteristics as a damping device and that damps not only horizontal vibration energy but also vertical vibration energy.

(Means for Solving the Problems) The gist of the steel rod damper of the seismic isolation device according to the present invention to solve the above problems and achieve the object is to install a steel rod damper between the bottom of the structure and the foundation. In a steel rod damper that attenuates seismic energy by plastic deformation of a plastic body, cylindrical elastic bodies and steel rings are alternately laminated, and the heights of the elastic bodies and steel rings are sequentially changed to form a taper shape. A laminated body, an outer cylinder into which the laminated body is mounted, and an elasto-plastic body that detachably fixes one end of a rod-shaped body to the central portion of the laminated body, and the other end of the elasto-plastic body And the outer cylinder is detachably fixed between the base and the bottom of the structure.

In addition, the elastic body of the laminated body in the laminated bush is formed of high damping rubber.

(Operation) As described above, according to the steel bar damper of the seismic isolation device according to the present invention, when an earthquake occurs and seismic energy is transmitted to the seismic isolation device mounted on the structure, the seismic isolation device can be rolled. The seismic energy will be consumed by the deformation of the elasto-plastic body of the steel rod damper and absorbed, and the taper-shaped laminate of the laminated bush will provide rigidity to the horizontal force. Is large and the rigidity against vertical force is small, it becomes possible for the laminated body to slip out of the main body and be deformed as the steel rod body is plastically deformed. As for the restoring force characteristic with respect to the force, as shown in FIG. 6 (a), good results can be obtained.

Further, by forming the elastic body of the laminated body with a high-damping rubber, it is possible to damp the energy of minute vertical vibrations due to traffic and the like.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing a state where the steel rod damper 1 of the seismic isolation device according to the present invention is attached to the bottom portion 2a of the structure 2. The structure of this steel rod damper 1 is shown in FIGS.
It will be described with reference to the drawings. The steel rod damper 1 has a required length and is fixed to a steel rod main body 1c in which a screw groove is threaded at a tip portion 1a and a rear end portion 1b thereof, and a bottom portion 2a of a structure 2. It is composed of a fixing metal fitting 4 having vertical surfaces 3a and 3b vertically extending from the mounting surface 3 and a laminated rubber bush 6 provided below the fixing metal fitting 4 fixed to a foundation 5.

This laminated rubber bush 6 forms a laminated body 6a by alternately laminating a rubber body 7 which is a cylindrical elastic body and a cylindrical steel ring 8 as shown in FIG. 3 to FIG. Then, a central metal fitting 9 having a screw portion 9a provided on the inner peripheral surface thereof is fixed to the central portion thereof, and the laminated body 6a is attached to one end portion with a mounting flange 10a.
It is formed by being attached to the outer cylinder 11 having. The mounting flange 10 is provided with mounting holes 10a for mounting the laminated rubber bush 6 on the base 5.

The rear end portion 1b of the steel rod main body 1c is screwed together with the nut 12 to the screw portion 9a of the middle metal fitting 9 of the laminated rubber bush 6 thus configured, and a predetermined number of bolts are provided at predetermined positions of the foundation 5. Then, the laminated rubber bush 6 is fixed to the base 5 by utilizing the mounting hole 10a of the laminated rubber bush 6. Further, the nut 12 is strongly tightened.

Then, the fixing metal fitting 4 is attached to the wall surface of the bottom portion 2a of the structure 2.
As shown in FIG. 2, the tip portion 1a of the steel rod body 1c screwed to the laminated rubber bush 6 is inserted into a through hole (not shown) provided in the upright surface 3a of the fixing bracket 4. In addition, at the position above the laminated rubber bush 6, the nuts 14,1
Fix at 5. After that, the mounting surface 3 is fixed to the bottom portion 2a of the structure 2 with bolts 13, 13, ....

In this way, the steel rod damper 1 of the present invention is formed, and the required number of steel rod dampers 1 is used according to the size of the structure 2 and the set value of the restoring force against an earthquake. The rod damper 1 is installed between the bottom 2a of the structure 2 and the foundation 5 as described above.

According to the steel rod dampers 1, 1 ... of the present invention, the seismic energy is absorbed in the event of an earthquake, and the restoring force characteristics are as shown in Fig. 6 (a). The reason why such a stable loop can be obtained is that the rubber body 7 of the laminate 6a and the steel rod body 1c which is an elastoplastic body are used. In Fig. 6 (a), the horizontal axis is the amount of deformation (unit: mm), the vertical axis is force (unit: ton), and the larger the area of this loop, the greater the amount of seismic energy absorbed and the damping. It is a good device.

In the seismic isolation steel rod damper 1 of the present invention, since the laminated body 6a of the laminated rubber bush 6 is tapered, the steel rod main body 1c is plastically deformed and the laminated body 6a is an outer cylinder in case of a large earthquake. It deforms from 11 and exits smoothly (see Fig. 6 (b)). This is because the structure 2 and the foundation 5 are relatively laterally displaced by the rolling of the earthquake, which causes the steel rod body.
The laminated body is pulled to 1c and comes out of the main body,
In addition, it returns to the original position.

Then, after the earthquake subsides, the steel rod body 1c is cut at a required location after the restoration, the nuts 12, 14, 15 are loosened, and the plastically deformed steel rod body 1c is replaced with a new one. Is to be used again.

As another embodiment, as shown in FIG. 6C, the rubber body 7 which is the elastic body is formed of a high damping rubber 7a as described in claim 2. The high-damping rubber is formed by reducing the rubber component from the usual one, and slightly increasing the filler such as carbon black and the plasticizer.

Therefore, it is possible to damp the energy of minute vertical vibrations due to traffic coming and going.

As described above, one embodiment of the steel rod damper according to the present invention has been shown. However, the present invention is not limited to this, and can be variously modified without changing the gist thereof. For example, a taper shape in a laminated body of laminated rubber bushes. May be provided on at least one side, the rubber as the elastic body may have a predetermined elasticity, and the steel ring may have a required rigidity.

The method of fixing the steel rod body to the bottom of the structure is not particularly limited.

(Effect of the Invention) According to the seismic isolation steel rod damper of the present invention, the steel rod damper is provided between the bottom of the structure and the foundation to attenuate the seismic energy by the plastic deformation of the elasto-plastic body. Of the elastic body and the steel ring are alternately laminated, and the height of the elastic body and the steel ring are sequentially changed to form a tapered laminated body, an outer cylinder into which the laminated body is mounted, and the laminated body. An elasto-plastic body that removably fixes one end of a rod-shaped body to the center of the body, and the other end of the elasto-plastic body and the outer cylinder are attached and detached between the base and bottom of the structure. Being fixed freely,
Moreover, the following effects are obtained by forming the elastic body of the laminated body with a high damping rubber.

In the event of an earthquake, the required number of steel rod dampers absorb the rolling energy, and the steel rod dampers exhibit good restoring force characteristics as a damping device.

An arbitrary damping value can be easily obtained by changing the number of installed steel rod dampers.

Since the laminated body of the laminated rubber bush is formed in a tapered shape, it can be deformed from the outer cylinder and smoothly come out, shock energy of rolling energy can be absorbed without difficulty, and it can be reused because it is restored. It is economical.

The steel rod damper has a simple structure, can be easily attached to the bottom of the structure and the foundation, and can easily replace the steel rod body.

By forming the elastic body of the laminated body in the laminated rubber bush with a high damping rubber, not only the rolling energy at the time of an earthquake can be attenuated but also the vibration energy in the vertical direction can be attenuated. It became a seismic isolation device that is more suitable for the building to be handled.

[Brief description of drawings]

FIG. 1 is a front view showing a state where the steel rod damper of the present invention is attached to a structure, and FIGS. 2 (a) and 2 (b) are enlarged side views and front views of the steel rod damper. FIG. 4 is a perspective view of a laminated rubber bush which is a component of the steel rod damper of the present invention, FIG. 4 is a plan view of the laminated rubber bush, and FIG.
Similarly, a vertical cross-sectional view of the laminated rubber bush, FIG.
Explanatory drawing showing the restoring force characteristics of the steel rod damper, FIG. 6 (b)
FIG. 6 is an explanatory view showing a state in which the laminated body of the laminated rubber bush is pulled out from the outer cylinder, FIG. 6 (C) is a longitudinal sectional view of the laminated rubber bush according to another embodiment, and FIG. It is a longitudinal section showing a seismic device. 1 …… Steel bar damper, 1a …… Steel bar body tip, 1b …… Steel bar body rear end, 1c …… Steel bar body, 2 …… Structure, 2a …… Structure bottom, 3 …… Mounting surface, 3a, 3b …… Upright surface, 4 …… Fixing metal fittings, 5 …… Foundation, 6 …… Laminated rubber bush, 6a …… Laminated body, 7 …… Elastic body, 7a …… High damping rubber, 8 ... Steel ring, 9 ... Medium metal fitting, 9a ... Screw part, 10 ... Mounting flange, 10a ... Mounting hole, 11 ... Outer cylinder, 12,14,15 ... Nut, 13 ... Bolt .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tsuneo Takazawa 3-18-32 Akitsu-cho, Higashimurayama-shi, Tokyo (72) Rokuro Fukuzawa 1468-7 Ozenji, Aso-ku, Kawasaki-shi, Kanagawa

Claims (2)

[Scope of utility model registration request] 1. A steel rod damper provided between a bottom portion of a structure and a foundation portion for damping seismic energy by plastic deformation of an elasto-plastic body, wherein cylindrical elastic bodies and steel rings are alternately laminated. , The elastic body and the height of the steel ring are sequentially changed to form a tapered laminated body, an outer cylinder into which the laminated body is mounted, and one end of a rod-shaped body is detachably attached to the central portion of the laminated body. A steel rod damper, wherein the steel rod damper is formed of an elasto-plastic body that is fixed to the base, and the other end of the elasto-plastic body and the outer cylinder are detachably fixed between the base portion and the bottom portion of the structure. 2. The steel rod damper according to claim 1, wherein the elastic body of the laminated body is formed of high damping rubber.