JP2561377Y2 - Fire Isolation Equipment for Seismic Isolators - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device generally installed on a foundation of a building (seismic isolation isolator), and more particularly to a fireproof device installed around the seismic isolation isolator.

[0002]

2. Description of the Related Art In recent years, a seismic isolation isolators have been provided at the foundation of a building as a measure against earthquakes. or,
From the viewpoint of effective use of land, for example, a seismic isolation isolators may be installed at the capitals of the first basement floor, and this underground space may be used for a parking lot, a warehouse or a machine room.

In this case, as a fire prevention measure, it is required by the Building Standards Law that the main body portion of the seismic isolation isolator, that is, the isolator main body constituted by alternately stacking a rubber elastic plate and a metal plate, is surrounded by a fireproof member. Have been.

For this reason, Japanese Utility Model Laid-Open Publication No. 63-116603 discloses a fireproof structure in which a flexible protective cover hermetically surrounds an isolator main body, and the protective cover is screwed to a base plate provided above and below the isolator main body. Has been advocated.

In Japanese Utility Model Laid-Open Publication No. 1-1131002,
There has been proposed a seismic isolation isolator having a fireproof structure in which a bellows made of flame-retardant rubber surrounds the entire seismic isolation isolator.

[0006]

On the other hand, seismic isolation isolators are required to be periodically inspected for their structure and performance. In order to inspect the main body of the isolator, fireproof members must be removed. However,
All of the above seismic isolators have the problem that it is extremely difficult or sometimes impossible to easily remove the protective cover or bellows as a fireproof member and then reattach it. In particular, when a large number of protective covers and the like are used in a stacked manner in order to ensure sufficient fire resistance, removal and installation of the protective covers require a great deal of time, resulting in extremely poor work efficiency. .

Accordingly, an object of the present invention is to provide a fireproof device for a seismic isolation isolator which does not hinder the movement of the seismic isolator during an earthquake, and which can easily remove and attach the fireproof material. That is.

[0008]

The above object is achieved by a fireproof device for a seismic isolation isolator according to the present invention. In summary, the present invention is directed to a seismic isolation isolator comprising an isolator body formed by alternately laminating a rubber elastic plate and a metal plate, and base plates respectively disposed above and below the isolator body. In the refractory device, a strip-shaped fire-resistant blanket having a predetermined thickness in which a ceramic fiber blanket is wrapped with a ceramic fiber cloth is formed. Positioned substantially surrounding the outer periphery and
The strip-shaped refractory blanket includes the isolator body and
A fireproof device for a seismic isolation isolator, wherein the fireproof device is not fixed to the upper and lower base plates. Preferably, the strip refractory blankets are arranged in layers.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a seismic isolation isolator according to the present invention.

Referring to FIG. 1 showing one embodiment of the present invention, a seismic isolation isolator comprises a rubber elastic plate 1A and a metal plate 1B.
Are alternately overlapped with each other, and base plates 2 and 3 are integrally mounted above and below the isolator body 1, respectively. This seismic isolation isolator is disposed between the upper structure 4 and the lower structure 5, and functions to reduce horizontal vibration during an earthquake and not transmit the vibration to the building side.

According to the present invention, a refractory blanket 6 is disposed so as to substantially surround the outer periphery of the isolator body 1 and to be movable. As shown in FIG. 3, the fire-resistant blanket 6 is a fire-resistant covering material in the form of a cushion, in which a ceramic fiber blanket 6A is wrapped with a ceramic fiber cloth 6B and sewn. In the present invention, the thickness (t), the length (L), A strip having a width (W) and a rectangular cross section is used, and for example, "Khao wool blanket" (trade name) or the like can be suitably used.

According to the present invention, as will be understood with reference to FIG.
When winding around the outer periphery of the isolator body 1, the inner cross-section 6a of the strip-shaped refractory blanket 6 is loosened, and the outer cross-section 6b is tensioned, so that both end faces of the strip-shaped blanket 6 are connected at the joint 6c. You. Further, the strip-shaped refractory blanket 6 is not fixed to the isolator main body 1 and the upper and lower base plates 2 and 3, that is, is in a movable state.

In this state, as shown in FIG. 6, it is assumed that the isolator main body 1 is horizontally displaced by a distance "S". The refractory blanket 6 can be deformed as much as the inner peripheral cloth 6a allows, and the shape maintenance during the refractory blanket deformation is achieved by maintaining the outer cloth 6b in a tight state. That is, fireproof blanket 6
Unlike the conventional fire-resistant protective cover, the upper edge 6d and the lower edge 6e arranged adjacent to the base plates 2 and 3 are not fixed to the base plates 2 and 3, respectively. In addition, the width W of the refractory blanket 6 is based on the base plate 2,
It is preferable that the distance is slightly larger than the distance 3 so that the isolator body 1 is substantially airtight. Specifically, for example, the distance between the base plates 2 and 3 is 150 mm.
At this time, the width W of the refractory blanket 6 will be 160 mm.

As described above, the strip-shaped refractory blanket 6 according to the present invention is deformed by being wound around the outer periphery of the isolator main body 1 so that the inner circumferential cloth 6a is loosened and the outer circumferential cloth 6b is tightened. The slackness of the inner peripheral side cloth 6a, which has the followability but determines the deformation followability, will be described in more detail.

Referring to FIG. 7, in order for the refractory blanket 6 to secure the horizontal deformation amount S, the inner circumferential cloth 6a must be at least (πd + 2) when the diameter of the isolator body 1 is d.
The circumference (L ₁ ) of S) is required.

On the other hand, the outer circumference and the inner circumference of the strip-shaped refractory blanket 6 are set to the length (L) of the strip-shaped refractory blanket 6.
Further, the outer peripheral length of the refractory blanket 6 is the same after the deformation. Therefore, if the outer peripheral diameter before the deformation is D, the peripheral length (L) of the inner peripheral side cloth 6a is πD, and L ₁ =
Since L, πd + 2S = πD.

Therefore, if a coil having a circumference of L ₁ = L ₂ = πd + 2S or more is wound, the deformation performance is maintained irrespective of the thickness. Further, ideally, it is desirable that the refractory material sufficiently covers around the isolator. In that case, it becomes as follows.

The relationship between the deformation S and the thickness (t) is It is. Generally, since the required deformation amount is 250 to 300 mm, the thickness (t) of the refractory blanket 6 is as follows.
What is necessary is just to use the thing of 79-95 mm. The thickness of the ceramic fiber cloth 6B itself is usually about 2 mm.

In the above embodiment, the strip-shaped refractory blanket 6 is used.
Are connected at the joint 6c as shown in FIG. 2, but any connection method can be used. As a preferable method, for example, FIG.
As shown in the figure, the end portions 6X and 6Y of the strip-shaped refractory blanket 6 are formed so as to have a half thickness on opposite sides, and one end portion 6X is provided with a fire-resistant string 7 and the other end portion 6Y 8, the terminal portions thereof are overlapped as shown in FIG. 8, and are removably connected by a fire-resistant cord 7.

Further, as shown in FIG. 5, the first refractory blanket 6 is formed by wrapping a ceramic fiber blanket 6A with a ceramic fiber cloth 6B and sewn as a fireproof covering material in the shape of a cushion. And a second strip-shaped refractory blanket 6 ″ having the same shape and size are staggered together in the longitudinal direction and stitched together, and the shifted ends 6 X and 6 Y are connected to each other. Although any method can be used as the connection method, a preferable method is, for example, a method in which the end 6X of the first strip-shaped refractory blanket 6 ′ is connected to the end 6X in the same manner as in the above embodiment. End 6Y of the second strip-shaped refractory blanket 6 "
A mounting hole 8 is formed in each of the two ends, and both ends 6X and 6Y are overlapped, and a refractory cord 7 is passed through the mounting hole 8 and tied, thereby being removably connected.

In the above embodiment, the isolator body 1
The refractory blanket 6 surrounding the isolator body 1 is a single layer, but may be configured so as to surround the isolator body 1 in a double layer or in a layered manner as shown in FIG.
Thereby, fire resistance performance is improved.

In each of the above embodiments, as shown in FIG. 6, when the isolator main body 1 is deformed by an earthquake, the base plates 2, 3 and the refractory blanket 6 are temporarily displaced, so that an opening may occur. As usual,
At the stage when a fire occurs, the earthquake subsides, the lateral displacement disappears, and the state returns to the normal state as shown in FIG. 1, so that the flame flows from the gap between the base plates 2 and 3 and the refractory blanket 6 to the isolator body 1. There is no risk of intrusion.

Further, in the above embodiment, the refractory blanket 6 has been described as being disposed between the base plates 2 and 3. However, for example, in order to prevent heat transfer from the base plates 2 and 3, When a structure such as a fire-resistant board is provided adjacent to the fire-resistant blanket 6, the fire-resistant blanket 6 can be disposed between the fire-resistant boards and installed so as to substantially surround the isolator body 1.

[0024]

As described above, the fireproof device for a seismic isolation isolator according to the present invention winds a strip-shaped fireproof blanket of a predetermined thickness so as to substantially surround the isolator main body, as described above. cross slack, to the outer peripheral side cross is configured to tension, without inhibiting the movement of the isolator body of an earthquake, moreover, the strip
The refractory blanket should be
Placed unsecured on the base plate,
Since the refractory material can be easily removed and attached, it is easy to check the performance of the isolator main body and the like, which is extremely effective in practical use.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a fireproof device for a seismic isolation isolator according to the present invention.

FIG. 2 is a cross-sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of a refractory blanket.

FIG. 4 is a perspective view of another embodiment of a refractory blanket.

FIG. 5 is a perspective view of yet another embodiment of a refractory blanket.

FIG. 6 is a cross-sectional view illustrating an operation of the fireproof device when the seismic isolation isolators are deformed.

FIG. 7 is a schematic cross-sectional view illustrating the operation of the fireproof device when the seismic isolation isolators are deformed.

FIG. 8 is a cross-sectional view of the fireproof device and the seismic isolation isolators.

FIG. 9 is a cross-sectional view of another embodiment of the fireproof device and the seismic isolation isolator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Isolator main body 1A Rubber elastic plate 1B Metal plate 2, 3 Base plate 6 Fireproof blanket 6A Ceramic fiber blanket 6B Ceramic fiber cloth 7 Fireproof string

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuo Aoki 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka Prefecture Inside Okumura Gumi Co., Ltd. (72) Ichiro Nishikawa 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture No. 1 Inside Showa Electric Wire & Cable Co., Ltd. (72) Inventor Katsumi Shimizu 2-1-1 Sakae Oda, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside 1 Showa Electric Wire & Cable Co., Ltd. (72) Inventor Takeo Kato Dojimahama, Kita-ku, Osaka 1-2-6, Isolite Industry Co., Ltd. (72) Inventor Yoshimitsu Hayakawa 1-2-6, Dojimahama, Kita-ku, Osaka-shi, Osaka Isolite Industry Co., Ltd. (56) References JP-A-3-87443 (JP, A) JP-A-1-263335 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A fireproof device for a seismic isolation isolator comprising an isolator main body formed by alternately laminating rubber elastic plates and metal plates, and base plates disposed above and below the isolator main body, respectively. A band-shaped refractory blanket having a predetermined thickness in which a ceramic fiber blanket is wrapped with a ceramic fiber cloth is formed. Disposed substantially surrounding and said strip
The refractory blanket includes the isolator body and the
A fire-resistant device for a seismic isolation isolator, which is arranged without being fixed to an upper and lower base plate .