JP2001173268A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation device having an easy structure. SOLUTION: An X-directional lower groove 13 extending in X-direction is formed on a base plate 10, and a middle plate bearing ball 21 is arranged within the X-directional lower groove 13 in such a manner as to be capable of rolling. According to this, a middle plate 20 is rockable in X-direction. A Y-directional lower groove 25 extending in Y-direction is formed on the upper surface of the middle plate 20, and an upper plate bearing ball 21 is arranged in the Y-directional lower groove 25 in such a manner as to be capable of rolling therein. An upper plate 30 is supported by the upper plate bearing ball 21 within a Y-directional upper groove 32 extending in Y-direction. According to this, the upper plate 30 is rockable in Y-direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a seismic isolation device for a building.

[0002]

2. Description of the Related Art In recent years, seismic isolation devices have been known in which a superstructure can be swung with respect to a foundation of a building in order to protect the building from damage caused by an earthquake. Of these seismic isolation devices, JP-A-10-331480 is known as a device using a rolling bearing. In the disclosed seismic isolation device, conical recesses are respectively formed in the upper surface of the receiving plate provided on the foundation side and the lower surface of the support plate supporting the upper structure, and a gap is maintained between the two surfaces via a ball holder. A plurality of steel balls are arranged, and a supporting plate is combined with a receiving plate in a rolling shaft shape.

[0003]

In such a seismic isolation device, a ball holder for rotatably mounting a plurality of balls is required. In particular, the structure of the ball holder is complicated, resulting in an expensive seismic isolation structure. Was. Therefore, an object of the present invention is to provide a seismic isolation device having a simple structure.

[0004]

According to the structure of the first aspect of the present invention, when the foundation of a building swings due to an earthquake, the base plate also swings. In the swing in the X direction, the intermediate plate bearing ball rolls in the lower groove in the X direction to absorb and reduce the swing of the base plate. In addition, the swing in the Y direction is reduced by absorbing the swing of the intermediate plate by the rolling of the upper plate bearing ball. As described above, the intermediate plate swings relatively in the X direction on the base plate and the upper plate swings in the Y direction on the intermediate plate, thereby absorbing the shaking of the earthquake and protecting the building.

According to the second aspect of the invention, the intermediate plate damping plate provided on the intermediate plate presses the side surface of the base plate to attenuate the swing of the intermediate plate. According to the third aspect of the present invention, the upper plate damping plate that contacts the side surface of the upper plate attenuates the swing of the upper plate.

[0006]

According to a first aspect of the present invention, an intermediate plate supporting ball is mounted in an upper X-direction groove extending in the X direction opposite to the lower X-direction groove so as to be swingable in the X direction. An intermediate plate in which a Y-direction lower groove extending in the Y direction is formed, and an upper plate bearing ball is arranged to be rollable in the Y-direction lower groove, and a Y-direction lower groove extending in the Y direction opposite to the Y-direction lower groove. The seismic isolation device having a simple structure can be provided by being constituted by the upper plate supported by the upper plate bearing ball and mounted to be swingable in the Y direction.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described in detail with reference to FIG. FIG. 1 shows an example in which the seismic isolation device 1 of this embodiment is mounted on a foundation B of a standing building, and a base plate 10 is fixed to the foundation B.
As shown in FIG. 2, an intermediate plate supporting ball 11 is disposed on the base plate 10, and an intermediate plate 20 is placed on the intermediate ball. Further, an upper plate bearing ball 21 is disposed on the intermediate plate 20,
An upper plate 30 fixed to the lower surface of the upper structure U of the building is placed on the upper plate bearing ball 21. This base plate 10,
The seismic isolation device 1 in which the intermediate plate 20 and the upper plate are laminated via the intermediate plate bearing balls 11 and the upper plate bearing balls 21 is mounted on the lower surface of the upper structure U, and vibrations caused by an earthquake are directly transmitted to the upper structure U.
To be propagated to

As shown in FIGS. 2 to 4, the base plate 10 has a substantially rectangular shape, and a screw mounting hole 12 is formed in a foundation B of a building. In addition, three X-direction lower grooves 13 (13a, 13b, 13c) are formed in parallel in the horizontal X direction, and the outer X-direction lower grooves 13a, 13c in FIG. The rear side of the central X-direction lower groove 13b is opened, and the cross-sectional shape thereof is substantially the same as that of the outer X-direction lower groove 13a. By opening one end of the X-direction lower groove 13 in this manner, molding can be easily performed by machining. And each X direction lower groove 13a, 13b, 13c
Open end of the stopper piece 14 (14a, 14b, 14c)
Are screwed with screws 15.

The cross section of the X-direction lower groove 13 is shown in FIG.
As shown in an exaggerated manner, in the X direction in the groove direction, it is formed in a V-shape with a gentle angle of 3 degrees or less from its center to both ends. Although not clearly shown in FIG. 4, the depth is slightly smaller than the radius of the intermediate plate supporting ball 11 and the width is slightly larger, so that the intermediate portion accommodated in the X-direction lower groove 13 is not shown. The plate bearing ball 11 is formed in a semi-elliptical shape so as to be able to roll, and the intermediate plate bearing ball 11 protrudes from the upper surface of the base plate 10.

The intermediate plate 20 is formed in a substantially rectangular shape having substantially the same shape as the base plate 10, and its lower surface is provided at three positions of the base plate 10 opposed to the X-direction lower grooves 13, and has three identical shapes. X-direction upper grooves 22 (22a, 22b, 22c) are respectively formed, and are closed by stopper pieces 23 (23a, 23b, 23c) screwed to their open ends. The upper groove 22 in the X direction formed on the intermediate plate 20 is also formed in a V-shape with a gentle angle of 3 degrees or less from the center to both ends in the X direction.

An X-direction lower groove 13 and an X-direction upper groove 22 formed on the base plate 10 and the intermediate plate 20, respectively.
The intermediate plate bearing ball 11 is rotatably disposed in the space formed by the intermediate plate 20. The intermediate plate 20 is supported by the three intermediate plate bearing balls 11, and the intermediate plate bearing ball 11 is rolled. It is mounted movably in the X direction. In addition,
Since both X-direction lower grooves 13 are formed in a V-shape, in a normal state, the intermediate plate supporting balls 11 are respectively stopped at the center positions where the V-shaped valleys are formed. It stops at the center position of the downward groove 13 in the direction.

A single Y-direction lower groove 25 is formed at the center of the upper surface of the intermediate plate 20 in the Y-direction. The Y-direction lower groove 25 has a substantially semicircular cross-sectional shape similar to that of the X-direction lower groove 13, and both ends thereof are opened, and the Y-direction lower groove 25 is opened.
When molding the slab, the machining can be easily performed.

Both open ends of the Y-direction lower groove 25 are connected to an L-shaped upper stopper piece 2 fixed to a side surface of the intermediate plate 20.
6 closed. As shown in FIG. 5, an L-shaped intermediate plate damping plate 27 is fixed to an elongated screw hole 26a formed in the upper stopper piece 26 so that the mounting position can be adjusted. This intermediate plate damping plate 27 has a sliding layer 27a made of a sliding material with a friction coefficient adjusted in the lower half.
Are bonded via an elastic rubber plate 27b. And
When fixing the intermediate plate attenuation plate 27 to the stopper piece 26 with bolts, the slip layer 27a of the intermediate plate attenuation plate 27 is pressed against the side surface of the base plate 10 and attached. in this way,
In the embodiment of the present invention, the intermediate plate damping plate 27 is adjusted so as to press the side surface of the base plate 10 to attenuate the swing of the intermediate plate 20.

On the upper surface of the intermediate plate 20, an upper plate attenuation plate 28 is attached and fixed in parallel with the Y-direction lower groove 25. The upper plate attenuation plate 28 is formed of an L-shaped thin plate, and a slit 29 for screwing is formed in one of the plates, and is attached to a screw hole (not shown) formed in the intermediate plate 20. The position is adjusted and fixed. A slip layer is adhered to the upright inner surface of the upper plate damping plate 28 via an elastic rubber plate similarly to the intermediate plate damping plate 27 of the intermediate plate 20, and is in close contact with the side surface of the upper plate 30. Mounted on Adjustment is made such that the upper plate 30 is pressed by the elastic bending force to attenuate the swing of the upper plate 30.

The upper plate 30 is substantially rectangular, and has a screw mounting hole 31 formed in the lower surface of the upper structure U of the building. On the lower surface of the upper plate 30, a single Y-direction upper groove 32 having the same shape as these is formed opposite to the Y-direction lower groove 25 of the intermediate plate 20, and the open end thereof is screwed by a stopper piece 33. ing. The upper groove 32 formed in the upper plate 30 is also formed in a V-shape with a gentle angle of 3 degrees or less from the center to both ends with respect to the Y direction.

An upper plate bearing ball 21 having the same diameter as the intermediate plate bearing ball 11 is provided in a space defined by the Y-direction lower groove 25 and the Y-direction upper groove 32 formed in the intermediate plate 20 and the upper plate 30, respectively. The upper plate 30 is arranged so as to be rollable.
Is supported by one upper plate supporting ball 21 and is mounted to be swingable in the Y direction. The Y-direction lower groove 25
Since the upper groove 32 and the Y-direction upper groove 32 are formed in a V-shape, in a normal state, the upper sphere stops at the center position which becomes the V-shaped bottom, and the upper plate 30 is connected to the Y-direction lower groove 2.
5 will be stopped at the center position.

Next, the operation of the above embodiment of the present invention will be described. The base plate 10 is mounted and fixed to a plurality of locations on the foundation B of the building with screws. Next, X direction lower groove 1
When the intermediate plate bearing ball 11 is inserted into each of the 3 (13a, 13b, 13c), the intermediate plate bearing ball 11 is arranged to be rollable at the center of the V-shaped inclined bottom surface of the X-direction lower groove 13.
The intermediate plate 20 is placed on the intermediate plate bearing ball 11. At this time, the intermediate plate damping plates 27 provided on both side surfaces of the intermediate plate 20 are adjusted, and both side surfaces of the base plate 10 are pressed and attached.
In this embodiment, since the intermediate plate 20 is supported by the three intermediate plate bearing balls 11, the intermediate plate 10 can be easily attached. When the upper plate bearing ball 21 is inserted into the lower groove 25 in the Y direction, it is arranged to be rollable at the center of the V-shaped inclined bottom surface.

On the other hand, the upper plate 30 is fixed to a predetermined portion on the lower surface of the upper structure U with a screw, and is placed on the upper plate bearing ball 21. The upper plate damping plate 28 is attached to both side surfaces of the upper plate 30. Press and attach. Thus, the seismic isolation device of this embodiment is mounted.

Here, when the foundation B of the building swings due to an earthquake or the like, the base plate 10 fixed to the foundation B swings. The swing in the X direction is absorbed by the rolling of the intermediate plate bearing ball 11. Further, in this embodiment, the intermediate plate bearing ball 11 rolls in the lower groove 13 in the X direction, so that it is possible to absorb a strong shaking. In addition, the swing in the Y direction is absorbed by the rolling of the upper plate bearing ball 21, and the upper plate bearing ball 21 is rolled and absorbed in the lower groove 25 in the Y direction by a strong swing. . As described above, the intermediate plate 20 oscillates relatively in the X direction on the base plate 10 and the upper plate 30 oscillates in the Y direction on the intermediate plate 20. Protect. At this time, the X direction lower groove 13 and the Y direction lower groove 25
Both are formed as loose V-shaped grooves, and the intermediate plate damping plate 27 and the upper plate damping plate 28 provided on the intermediate plate 20 slide on the respective side surfaces of the base plate 10 and the upper plate 30, Shaking in the X and Y directions is attenuated.

As described above, one embodiment has been described.
The present invention is not limited to this embodiment, but can be implemented as exemplified below.

(1) In the above-described embodiment, the lower groove 13 in the X direction or the lower groove 25 in the Y direction is a loose V-shaped groove, but the center of a groove such as a loose arc groove or a U-shaped groove has both ends. Lower than the above, it is possible to adopt a configuration in which the damping function and the function of holding at the center position can be exhibited.

(2) In the embodiment, the intermediate plate bearing ball 11
And the upper plate bearing ball 21 are spheres having the same diameter, but it is not always necessary to use the same sphere. For example, the diameter of the intermediate plate bearing ball 11 may be a sphere having a smaller diameter than the upper plate bearing ball 21. .

(3) In the embodiment, the base plate 10 has X
Although three lower grooves 13 are provided and supported by three intermediate plate bearing balls 11 to facilitate the mounting work when mounting to a building, it is necessary to use three lower grooves 13 in the X direction. Instead, for example, as shown in FIG. 6, a mounting plate 41 for screwing to a foundation B of a building may be formed, and a base plate 40 having an X-direction lower groove 42 formed at the center thereof may be used.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an installation state.

FIG. 2 is an exploded perspective view.

FIG. 3 is a cross-sectional view cut in the X direction.

FIG. 4 is a sectional view cut in the Y direction.

FIG. 5 is an enlarged sectional view of a damping plate.

FIG. 6 is a perspective view of another example of a base plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Base plate 11 ... Intermediate plate support ball 13 ... X direction lower groove 20 ... Intermediate plate 21 ... Upper plate support ball 22 ... Base Y direction lower groove 25 ... Y direction lower groove 27 ... Intermediate plate attenuation plate 28 ... Upper plate attenuation plate 30 ... Upper plate 32: Y-direction upper groove

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takayuki Shibayama 2 Sanage-cho, Kita-ku, Nagoya-shi F-term (reference) 3D048 AA06 AA07 AC01 BA24 BE12 BG02 DA01 EA38

Claims (5)

[Claims] 1. A base plate fixed to a foundation side of a building;
In a seismic isolation device having an intermediate plate interposed between an upper plate fixed to a lower surface of an upper structure of a building, an X-direction lower groove extending in the X direction is formed on an upper surface, and the intermediate plate is provided in the X-direction lower groove. A base plate on which a bearing ball is rotatably arranged; and a base plate supported by the intermediate plate bearing ball in an X-direction lower groove extending in the X direction opposite to the X-direction lower groove, and mounted so as to swing in the X direction. And an intermediate plate in which a Y-direction lower groove extending in the Y direction is formed on the upper surface, and an upper plate bearing ball is arranged to be rollable in the Y-direction lower groove. The seismic isolation device is constituted by the upper plate supported by the upper plate bearing ball in the Y-direction upper groove extending in the Y direction and mounted so as to be swingable in the Y direction. 2. The seismic isolation device according to claim 1, wherein the intermediate plate is provided with an intermediate plate damping plate for pressing a side surface of the base plate to attenuate the swing of the intermediate plate. 3. The seismic isolation device according to claim 1, wherein the intermediate plate is provided with an upper damping plate for pressing a side surface of the upper plate to attenuate the swing of the upper plate. apparatus. 4. The seismic isolation device according to claim 1, wherein the X-direction lower groove is formed in a gentle V shape from the center to both ends. 5. The seismic isolation device according to claim 1, wherein the Y-direction lower groove is formed in a gentle V shape from the center to both ends.