JPH07122350B2 - Seismic isolation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a seismic isolation device for protecting a building structure from daily ground vibrations due to vehicle traffic, earthquakes and other vibrations, and particularly in a vertical direction. The present invention relates to a seismic isolation device with an improved vibration damping function against vibration.

<< Conventional Technology >> In places close to roads and railways, weak ground vibrations in the vertical direction are routinely generated due to vehicle traffic. In recent years, there has been an increasing demand for protection of building structures constructed in such places and improvement of habitability.

As a highly versatile seismic isolation device, there is a type in which an elastic support made of laminated rubber elastically supports a building structure on a foundation. In particular, from the viewpoint of enhancing the vibration absorption performance of the weak vibration in the vertical direction as described above, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 63-10105, the laminated rubber forming the elastic bearing has a thick wall. Tend to be

<< Problems to be Solved by the Invention >> By the way, in the case of increasing the thickness of the laminated rubber to improve the vibration absorbing performance against the vibration in the vertical direction, it can be combined with the thick laminated rubber, that is, the vibration in the vertical direction. It is necessary to provide a damper capable of attenuating the vibration, but there has been no known vertical damper that can be preferably used, and it has been difficult to realize a seismic isolation device that effectively uses thick laminated rubber.

Here, as a horizontal vibration damping damper, a steel rod damper having a relatively simple structure and low cost is known. The steel rod damper is composed of vertical steel rods whose upper and lower ends are locked between the building structure and the foundation, respectively. The steel rod damper is elasto-plastically deformed by this steel rod. It is designed to absorb the horizontal vibration energy of an object.

The present invention focuses on such a steel rod damper, and an object of the present invention is to provide a seismic isolation device which can realize a vibration damping function in the vertical direction with a relatively simple structure at a low cost by using this damper. .

<< Means for Solving the Problem >> The present invention relates to an elastic support for elastically supporting a building structure on a foundation, and a vertical direction between the building structure and the foundation, and both ends thereof are in a horizontal direction. And is elastically deformed according to the horizontal vibration of the building structure,
One of the rod bodies is allowed to move in the vertical direction, and one end of the rod body is inserted, and a viscous material is slidable at one end according to the vertical movement of the building structure. .

<< Operation >> According to the present invention, with respect to horizontal vibration such as at the time of earthquake, vibration absorption and damping are achieved by elastic-plastic deformation of the elastic support body and the rod body. On the other hand, with respect to traffic vibrations and other vertical vibrations, the vibrations are buffered by the elastic support body and the vertical shearing resistance generated by the relative movement between the rod body and the viscous material at any one end of the rod body. , Absorption of vibration energy is performed. Therefore, the damping effect on the vibration in the vertical direction is also secured. Particularly, in the present invention, since it is a configuration utilizing a rod body that has been conventionally used for damping horizontal vibration,
The vibration damping function in the vertical direction can be realized relatively easily and at low cost.

<< Example >> An example of the seismic isolation apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows the whole structure of the seismic isolation device, and FIG. 2 shows an enlarged main part.

The present invention basically comprises an elastic support 3 for elastically supporting a building structure 1 on a foundation 2 and a vertical direction between the building structure 1 and the foundation 2 and both ends being horizontal to them. And the rod body 5 that is elastically deformed according to the horizontal vibration of the building structure 1 and one end of which is allowed to move in the vertical direction, and one end of the rod body 5 is inserted. A viscous material 13 is slidable at one end according to the vertical movement of the building structure 1.

In this embodiment, as shown in FIG. 1, a columnar leg 1a is provided at the bottom of the building structure 1, and a flange 1b is formed at the lower end of the columnar leg 1a. On the other hand, a columnar base 2a is provided on the upper surface of the foundation 2 so as to face the columnar legs 1a, and a flange portion 2b is formed at the upper end of the columnar base 2a. And these columnar legs
An elastic support body 3 is provided between the 1a and the columnar base 2a. The elastic support 3 is a columnar member made of laminated rubber,
It is of a relatively thick rubber type, and elastically supports the building structure 1 on the foundation 2.

A pair of steel rod dampers 4 are provided on both sides of the elastic support body 3 between the collar portion 1b of the columnar leg 1a and the collar portion 2b of the columnar base 2a. The steel rod damper 4 is mainly composed of a vertical steel rod 5 as a rod body, and the upper and lower ends of the steel rod 5 are along the vertical direction provided on the collar portion 1b of the columnar leg 1a and the collar portion 2b of the columnar base 2a. The spherical bearing 8 is inserted in the mounting holes 6 and 7. Both ends of the steel rods 5 are horizontally locked to the columnar legs 1a of the building structure 1 and the columnar base 2a of the foundation 2 by spherical bearings 8 so that the steel rods 5 are horizontally aligned between the building structure 1 and the foundation 2. When a relative displacement occurs, the both ends are horizontally moved integrally with the building structure thickness 1 and the foundation 2, respectively. As a result, the steel rod 5 undergoes elasto-plastic deformation between its both ends and absorbs horizontal vibration energy.

At the lower end of the steel rod damper 4, a vertical damper portion 10 that absorbs the vibration energy in the vertical direction due to the shear resistance of the viscous material is provided. That is, the lower end portion of the steel rod 5 penetrates the flange portion 2b of the columnar base 2a and projects downward. This steel rod 5
Unlike the fixing structure of the upper end portion (see fixing tool 9 in the figure), the projecting part of is configured to be guided by the spherical bearing 8 and allowed to move vertically downward, and the projecting part is coaxial with the projecting part. The small-diameter cylindrical body 11 that is electrically connected is inserted into the viscous material 13 in the large-diameter cylindrical case 12 attached to the lower surface of the collar portion 2b of the columnar base 2a. When a relative displacement in the vertical direction occurs between the building structure 1 and the foundation 2, the small-diameter cylindrical body 11 corresponds to this relative displacement.
Moves in the vertical direction with respect to the viscous material 13, and due to the shear resistance generated between the viscous material 13 and the viscous material 13, a resistance force (damping force) against the vertical vibration of the building structure 1 can be obtained. There is. As the viscous material 13, for example, silicon or another viscous fluid having little temperature dependency is applied.

Also, considering horizontal vibration, the case 12 is
It is desirable to mount it so that it can swing with respect to 2b. In this embodiment, as shown in FIG. 2, the upper end portion of the case 12 is attached to the flange portion 2b of the columnar base 2a by a tubular connector 14 with a flange in a suspended state. The part is thin and easy to yield. According to such a configuration, when the steel rod 5 is in an inclined state during horizontal seismic isolation and a horizontal load is applied to the case 12 via the steel rod 5, the case follows the inclination of the steel rod 5. It becomes possible for 12 to incline via the thin cylindrical portion of the connecting tool 14, and damage to the vertical damper portion 10 can be prevented. As a means for allowing the case 12 to swing with respect to the base 2, a pin support structure such as a universal joint can be used.

According to the above-described embodiment, with respect to horizontal vibration such as an earthquake, vibration absorption and damping can be achieved by elastic-plastic deformation of the elastic support body 3 and the steel rod damper 4.

On the other hand, with respect to vertical vibrations such as traffic vibrations, the vibrations are buffered by the laminated rubber of the elastic support body 3, and the viscous material 13 of the vertical damper portion 10 provided at the lower end portion of the steel rod damper 4 is used.
The vibration resistance is absorbed by the shear resistance due to. In particular, in this embodiment, since the vertical damper portion 10 is configured by using the steel rod damper 4 used for horizontal vibration damping, the vibration damping function in the vertical direction can be realized relatively easily and at low cost. become. Although the vertical damper portion 10 is provided on the foundation 2 side in the present embodiment, it goes without saying that it may be provided on the building structure 1 side.

Further, since the case 12 is attached to the foundation 2 so as to be swingable, the case 12 can be tilted by following the tilt of the steel rod 5 during the horizontal seismic isolation action, and the vertical damper part 10 can be prevented from being damaged. Can be achieved.

The vertical damper unit 10 can also exhibit a function of damping horizontal vibration. That is, at the time of horizontal vibration, the lower end of the steel bar 5 is displaced relative to the viscous material 13 by the vertical displacement component of the inclination of the steel bar 5, and shear resistance of the viscous material 13 is induced. The damping function of is also obtained.

Furthermore, by combining the small-diameter cylindrical body 11 and the case 12 as a multiple cylindrical structure having different diameters, the cylindrical wall and the viscous material are combined.
It is possible to increase the contact area with 13, which makes it possible to obtain a large shear resistance despite its compact structure.
High seismic isolation performance can be demonstrated.

<< Effects of the Invention >> As described above, according to the present invention, the rod body that absorbs horizontal vibration is used, and the rod body is moved into the viscous material according to the vertical movement of the building structure. The vibration damping function in the direction can be realized at a low cost with a relatively simple structure.

[Brief description of drawings]

FIG. 1 is an overall sectional view showing an embodiment of a seismic isolation device according to the present invention, and FIG. 2 is an enlarged sectional view showing an essential part of FIG. 1 ... Building structure, 2 ... Foundation 3, Elastic support, 5 ... Rod body (steel rod) 13 ... Viscous material

Claims (1)

[Claims] 1. An elastic support for elastically supporting a building structure on a foundation, and the elastic support provided between the building structure and the foundation along the vertical direction and with both ends locked to them in the horizontal direction. And a rod body which is elastically plastically deformed according to horizontal vibration of the building structure, and one end of which is allowed to move in the vertical direction, and the one end of the rod body being inserted into the upper and lower parts of the building structure. A seismic isolation device comprising: a viscous material whose one end slides in response to movement.