JPH053521U - Seismic Isolator Fireproof Device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a fireproof device for a seismic isolation isolator that does not impede the movement of the seismic isolation isolator in the event of an earthquake and that allows easy removal and installation of the refractory material. A refractory blanket 6 is arranged so as to substantially surround the outer periphery of the isolator body 1. The fireproof blanket 6 is a cushion-like fireproof covering material obtained by wrapping a ceramic fiber blanket 6A with a ceramic fiber cloth 6B and sewing it. Further, the belt-shaped fireproof blanket 6 having a predetermined thickness is movably attached when wound around the outer periphery of the isolator body 1, and the inner-circumferential-side cloth of the belt-shaped fire-resistant blanket 6 is loosened and the outer-circumferential-side cloth is tensioned. Thus, both end surfaces of the strip blanket 6 are connected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention generally relates to a seismic isolation device (seismic isolator) installed in a foundation of a building, and more particularly to a fireproof device provided around the outside of the seismic isolation isolator.

[0002]

[Prior Art]

 In recent years, seismic isolation isolators have been installed at the foundation of buildings as a measure against earthquakes. From the viewpoint of effective use of land, a seismic isolation isolator may be installed on the stigma on the first basement floor, and this underground space may be used as a parking lot, warehouse, or machine room.

In this case, as a fire protection measure, it is necessary to enclose the main body of the seismic isolation isolator, that is, the isolator main body constituted by alternately stacking a rubber elastic plate and a metal plate with a fire resistant member. Mandatory by.

For this reason, Japanese Utility Model Laid-Open No. 63-116603 discloses a fire protection system in which a flexible protective cover hermetically surrounds an isolator body, and the protective cover is screwed to base plates provided above and below the isolator body. A structure has been proposed.

Further, Japanese Utility Model Laid-Open No. 1-131702 proposes a seismic isolation isolator having a fire resistant structure in which the entire seismic isolation isolator is surrounded by a bellows made of flame-retardant rubber.

[0006]

[Problems to be solved by the device]

 On the other hand, seismic isolation isolators are required to be regularly inspected for their structure and performance, and fireproof members must be removed in order to inspect the isolator body. However, in any of the above-mentioned seismic isolation isolators, it is extremely difficult or sometimes impossible to easily remove the protective cover or bellows as a fireproof member and then reattach it. There is. In particular, when a large number of protective covers, etc. are stacked in order to ensure sufficient fire resistance, it takes a lot of time to remove and install them, resulting in extremely poor work efficiency. .

Therefore, 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 isolation isolator during an earthquake and can easily remove and install the refractory material. It is to be.

[0008]

[Means for Solving the Problems]

 The above object is achieved by the fireproof device of the seismic isolation isolator according to the present invention. In summary, the present invention is a seismic isolation isolator including an isolator body composed of rubber elastic plates and metal plates alternately laminated, and base plates disposed above and below the isolator body. In the fireproof device, a belt-shaped refractory blanket having a predetermined thickness, which is a ceramic fiber blanket covered with a ceramic fiber cloth, has a slackened inner side cloth and a tighter outer side cloth. A fire-resistant device for a base isolation isolator, which is arranged so as to substantially surround the outer circumference of the isolator body and to be movable. Preferably, the strip refractory blanket is arranged in multiple layers.

[0009]

【Example】

 Next, the fireproof device of the seismic isolation isolator according to the present invention will be described in more detail with reference to the drawings.

Referring to FIG. 1 showing an embodiment of the present invention, a seismic isolation isolator comprises an isolator body 1 composed of a rubber elastic plate 1A and a metal plate 1B which are alternately stacked. Base plates 2 and 3 are integrally attached to the lower side and the lower side, respectively. This seismic isolation isolator is arranged between the upper structure 4 and the lower structure 5 and functions to reduce horizontal vibration during an earthquake and prevent it from being transmitted to the building side.

According to the invention, a refractory blanket 6 is arranged substantially surrounding the outer circumference of the isolator body 1 and in a moving manner. As shown in FIG. 3, the fireproof blanket 6 is a cushion-like fireproof covering material obtained by wrapping a ceramic fiber blanket 6A with a ceramic fiber cloth 6B, and in the present invention, the thickness (t), length (L), A strip having a rectangular cross section with a width (W) is used, and for example, "Kao wool blanket" (trade name) can be preferably used.

According to the present invention, as will be understood with reference to FIG. 2, when the strip-shaped refractory blanket 6 having a predetermined thickness is wound around the outer periphery of the isolator body 1, the strip-shaped refractory blanket 6 has an inner peripheral side. Both ends of the strip blanket 6 are connected at the joints 6c such that the cross 6a is loosened and the outer cross 6b is strained. Further, the band-shaped refractory blanket 6 is not fixed to the isolator body 1 and the base plates 2 and 3 therebelow, that is, is movable.

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 by the amount permitted by the inner peripheral side cloth 6a, and the shape is maintained when the refractory blanket is deformed by maintaining the tension on the outer peripheral cloth 6b. That is, unlike the conventional fireproof protective cover, the fireproof blanket 6 does not fix the upper end edge 6d and the lower end edge 6e disposed adjacent to the base plates 2 and 3 to the base plates 2 and 3, respectively. It is preferable that the width W of the refractory blanket 6 be slightly larger than the distance between the base plates 2 and 3 so that the isolator body 1 is substantially airtight. Specifically, for example, when the distance between the base plates 2 and 3 is 150 mm, the width W of the refractory blanket 6 will be 160 mm.

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

Referring to FIG. 7, in order to ensure the horizontal deformation amount S of the refractory blanket 6, the inner peripheral cross 6 a has a minimum peripheral length (L ₁ + 2S) (L ₁ ), where d is the diameter of the isolator body _1. ) Is required.

On the other hand, the outer circumference and the inner circumference of the band-shaped refractory blanket 6 are the length (L) of the band-shaped refractory blanket 6, and the outer peripheral length of the refractory blanket 6 is the same after the deformation, and therefore, before the deformation. Let D be the outer diameter of the inner peripheral cross 6a, the peripheral length (L) of the inner peripheral cross 6a is πD, and L ₁ = L, so πd + 2S = πD.

Therefore, if the peripheral length L ₁ = L ₂ = πd + 2S or more is wound, the deformation performance is maintained regardless of the thickness. Furthermore, ideally, it is desirable that the refractory material sufficiently covers the isolator. In that case:

The relationship between the deformation amount S and the thickness (t) is S = π · (D−d) / 2 = π · t. Generally, the required deformation amount is set to 250 to 300 mm, so that the thickness (t) of the refractory blanket 6 may be 79 to 95 mm. The thickness of the ceramic fiber cloth 6B itself is usually about 2 mm.

In the above embodiment, the band-shaped refractory blanket 6 is connected at the joint 6c as shown in FIG. 2, but any connecting method can be used. . As a preferable method, for example, as shown in FIG. 4, the end portions 6X and 6Y of the belt-like fireproof blanket 6 are formed so that the thicknesses are half on opposite sides, and one end portion 6X has a fireproof cord. The body 7 is provided, the mounting hole 8 is formed in the other end portion 6Y, and the end portion is overlapped as shown in FIG. 8 and is detachably connected by the fire resistant cord 7.

Further, as shown in FIG. 5, the fire-resistant blanket 6 is a first belt-like fire-resistant covering material, which is a quilt-like fire-resistant covering material obtained by wrapping a ceramic fiber blanket 6A with a ceramic fiber cloth 6B. The blanket 6'and the second strip-shaped refractory blanket 6 "having the same shape and size are longitudinally offset from each other and integrally stitched together, and the displaced ends 6X and 6Y are connected to each other. Although any method can be used as the connection method, the preferred method is, for example, the end of the first belt-shaped refractory blanket 6'as in the above embodiment. The portion 6X is provided with the fire-resistant cord 7, the mounting hole 8 is formed in the end portion 6Y of the second band-shaped fire-resistant blanket 6 ", and both end portions 6X and 6Y are overlapped to form the fire-resistant cord 7 Is attached to the mounting hole 8 and is tied in a detachable manner by tying.

Further, in the above-described embodiment, the refractory blanket 6 surrounding the isolator main body 1 is a single layer, but as shown in FIG. 9, the isolator main body 1 is layered in double layers or more layers. It can also be configured to surround. This improves fire resistance.

In each of the above-described embodiments, as shown in FIG. 6, when the isolator main body 1 is deformed by an earthquake, the base plates 2 and 3 and the refractory blanket 6 may be temporarily displaced and an opening may be formed. Even if it does, even if the fire usually occurs, the earthquake will subside, the lateral slippage will disappear, and the normal condition as shown in Fig. 1 will be restored. Therefore, from the gap between the base plates 2 and 3 and the refractory blanket 6, There is no risk of flames penetrating into the isolator body 1.

Further, in the above embodiment, the fireproof blanket 6 is described as being disposed between the base plates 2 and 3, but for example, to prevent heat transfer from the base plates 2 and 3, the fireproof blanket 6 is attached to the base plates 2 and 3. When a structure such as a refractory board is provided adjacent to each other, the refractory blanket 6 can be disposed between the refractory boards and can be installed so as to substantially surround the isolator body 1.

[0024]

[Effect of the device]

 As described above, the fireproof device for the seismic isolation isolator according to the present invention has a band-shaped refractory blanket of a predetermined thickness wound around the isolator body substantially and the inner side cloth is slackened. Since the outer cross is configured to be tense, it does not hinder the movement of the isolator body in the event of an earthquake, and the refractory material can be easily removed and installed. It is easy to inspect the performance of, and is extremely effective in practice.

[Brief description of drawings]

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

2 is a cross-sectional view taken along the line II-II in 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 the operation of the fireproof device when the seismic isolation isolator is deformed.

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

FIG. 8 is a cross-sectional view of a fireproof device and a base isolation isolator.

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

[Explanation of symbols]

 1 Isolator 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 cord

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Eihisa Kuramoto 2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka Prefecture Okumura Gumi Co., Ltd. (72) Kazuo Aoki 2-chome, Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka No.2 Okumura Gumi Co., Ltd. (72) Ichiro Nishikawa Inventor Ichiro Nishikawa 2-1-1 Oda Sakae, Kawasaki-ku, Kanagawa Prefecture Showa Electric Wire & Cable Co., Ltd. (72) Katsumi Shimizu 2 Oda Sakae, Kawasaki-ku, Kanagawa Prefecture 1-1-1, Showa Electric Cable Denki Co., Ltd. (72) Takero Kato 1-2-6, Dojimahama, Kita-ku, Osaka-shi, Osaka Prefecture Isolight Industry Co., Ltd. (72) Yoshimitsu Hayakawa Dojimahama, Kita-ku, Osaka-shi, Osaka 1-2-6, Isolite Industry Co., Ltd.

Claims (1)

[Claims for utility model registration] 1. An isolator main body composed of rubber elastic plates and metal plates alternately laminated, and a base plate disposed above and below the isolator main body. In a fireproof device for a seismic isolator, a belt-shaped refractory blanket having a predetermined thickness in which a ceramic fiber blanket is covered with a ceramic fiber cloth is such that the inner-circumferential-side cloth of the belt-shaped refractory blanket is slack and the outer-circumferential-side cloth is tense. A fireproof device for a seismic isolation isolator, which is arranged so as to substantially surround the outer circumference of the isolator body and to be movable.