JP3457470B2 - Fire resistant structure of laminated rubber bearing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire resistant structure of a laminated rubber bearing used in a seismic isolation device or the like.

[0002]

2. Description of the Related Art Conventionally, base plates have been attached to the upper and lower ends of a laminated rubber bearing formed by laminating a rubber plate and a metal plate in order and integrally laminated to form a laminated rubber bearing as an upper structure of a building. There are known seismic isolation devices that intervene with the lower structure, but when installing such seismic isolation devices on the middle floor of a building, the laminated rubber bearings will be treated as pillars. Therefore, it becomes necessary to use a fireproof structure.

Here, as the fire resistant structure of the laminated rubber bearing, it is conceivable to provide a fire resistant coating layer around the laminated rubber bearing, but in that case, it is required that the fire resistant coating layer can also follow the displacement. Thus, as a fireproof coating structure having a function capable of following displacement, a large number of ring-shaped fireproof materials are laminated around the outer periphery of a laminated rubber bearing and covered over substantially the entire length of each ring-shaped fireproof material. In Japanese Utility Model Application Laid-Open No. 63-190403, a method in which the two are relatively displaced in the horizontal direction is proposed.

[0004]

However, according to the above-mentioned proposal, the size of the ring-shaped refractory material is examined and manufactured in accordance with the outer diameter of the laminated rubber bearing, its displacement and the required fire resistance time. In addition, there is a problem that the work of mounting the large number of ring-shaped refractory materials around the laminated rubber bearing is complicated and time-consuming.

The present invention has been made in view of such conventional problems, and an object thereof is to cover the periphery of a laminated rubber bearing with a fireproof coating layer having sufficient displacement followability and heat insulation. Another object of the present invention is to provide a fire resistant structure of laminated rubber bearings that is easy to construct.

[0006]

In order to achieve the above object, in a fire resistant structure of a laminated rubber bearing according to claim 1 of the present invention, a laminated rubber in which a rubber plate and a metal plate are sequentially stacked and integrally laminated. The periphery of the support is foamed and expanded when heated to a predetermined temperature or higher, and is covered with a rubber material of a foam-type fireproof composition that forms a fireproof carbonized layer, and the foamable fireproof composition is a polyphosphate salt. It is characterized by comprising a polyisobutylene rubber having a reactive silicon group containing a compound.

Here, the rubber material of the foaming type fireproofing composition normally has elasticity equal to that of the laminated rubber bearing, and not only can it follow its displacement sufficiently, but it also becomes constant due to fire. When heated above the temperature, the foam expands several times to several tens of times to form a carbonized layer having excellent heat insulating properties, and this carbonized layer serves as a fire resistant heat insulating layer to protect the laminated rubber bearing inside.

In forming the coating, for example, a simple operation of winding a sheet-shaped rubber material of a foam-type fireproof composition with a desired thickness in accordance with a required fireproof time is required, and since it is a synthetic rubber, a laminated rubber bearing is used. It can be formed integrally with the outer periphery of the body when it is manufactured, and it can be easily installed without any trouble.

Further, even in repairing, the simple work of removing the foamed and expanded and carbonized coating layer and re-wrapping a new sheet-shaped rubber material of the foam-type fireproof composition to a desired thickness is sufficient. Further, in the fire resistant structure of the laminated rubber bearing according to claim 2 of the present invention, when the periphery of the laminated rubber bearing in which the rubber plate and the metal plate are sequentially stacked and integrated is heated to a predetermined temperature or higher, foaming occurs. expand to, coated with rubber material <br/> Ru foamable fireproofing composition to form a fire protection carbide layer, foamed type fire
The reactive composition comprises a reactive silicon group containing a polyphosphate compound.
A tubular body having a polyisobutylene rubber and having a clearance between the coating layer and the laminated body, and the coating layer having flange portions radially outwardly expanding at both upper and lower ends. And the flange portions are fastened and fixed to an upper base plate and a lower base plate attached to the upper and lower ends of the laminated body through annular attachment fittings. According to the fire resistant structure of the laminated rubber bearing according to claim 2, the air in the clearance between the covering layer and the laminated body functions as a heat insulating layer, so that the covering layer is adhered to the laminated body. The thickness of the coating layer can be reduced as compared with the case of integrally providing.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a fire resistant structure for a laminated rubber bearing according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a first embodiment. As shown in FIG. 1, a laminated rubber bearing 2 is formed by laminating a large number of rubber plates 4 and metal plates 6 in order and integrally laminated. An upper base plate 10 and a lower base plate 12 are integrally attached to the upper and lower ends of the body 8, respectively.

The laminated rubber bearing 2 is provided with a coating layer 14 made of a rubber material of a foaming type fireproof composition on the outer periphery of the laminated body 8 so as to surround and cover the laminated body 8. The rubber material of the foamable fireproof composition is formed by using a saturated hydrocarbon polymer having a reactive silicon group and a polyphosphate compound as essential components.

The saturated hydrocarbon polymer has a hydroxyl group or a hydrolyzable group bonded to a silicon atom and can be crosslinked by forming a siloxane bond. For example, polyisobutylene rubber or the like is used.

Further, the polyphosphate compound acts as a dehydration catalyst for organic matter in a heated environment,
It also has the function of forming an incombustible inorganic phosphate film. The polyphosphate compound is not particularly limited as long as it is a polyphosphoric acid salt, but a salt of polyphosphoric acid with ammonia or an amine is preferable.

When a salt of polyphosphoric acid with ammonia or an amine reaches a predetermined decomposition temperature by heating, deammonia and deamine produce condensed phosphoric acid. As a result of this acid acting as a dehydration catalyst for organic substances and carbonizing the organic substances,
This leads to the formation of a fireproof carbonized layer. Further, the ammonia gas or the like generated at this time acts as a foaming agent and expands the entire composition.

Since the rubber material of the foaming type fireproof composition is a synthetic rubber and can be used as a sheet-like material or a molded body, the laminated body 8 of the laminated rubber bearing body 2 is used for the covering molding. At the time of molding, the outer peripheral surface of the laminate 8 may be integrally formed to have a desired thickness in accordance with the required fire resistance time, or a sheet-like material may be wound to a desired thickness afterwards. Is also good.

In the fire-resistant structure of the laminated rubber bearing body constructed as described above, the coating layer 1 made of the rubber material of the foaming type fireproof composition surrounding and covering the outer periphery of the laminated rubber bearing body 2
4 has elasticity equal to that of the laminated rubber bearing 2 in normal time, and can be elastically deformed sufficiently following the displacement of the laminated rubber bearing 2 in the horizontal direction. Does not interfere with vibration absorption.

On the other hand, when the coating layer 14 is heated to a certain temperature or higher due to a fire that occurs in the lower floors, etc., the coating layer 1
The rubber material of the foaming type fireproofing composition that forms No. 4 foams and expands several times to several tens of times to form a carbonized layer having excellent heat insulation properties. Protect 2 from fire.

Further, in forming the coating, for example, a simple operation of winding a sheet-shaped rubber material of a foam-type fireproof composition with a desired thickness according to a required fire resistance time is required, and since it is a synthetic rubber, it is laminated. When the rubber bearing 2 is manufactured, it can be formed integrally with the outer periphery of the rubber bearing 2, so that the rubber bearing 2 can be easily installed without any trouble.

Further, even when repairing, it is possible to simply remove the coating layer that has been foamed and expanded and carbonized, and then re-wrap a new sheet-shaped rubber material of the foamable fireproof composition to a desired thickness.

FIG. 2 shows a second embodiment. In the second embodiment, the coating layer 14 is provided with a clearance s between it and the laminated body 8. That is, the coating layer 14 is formed in a tubular shape having flange portions 14 a that radially expand outward at both upper and lower ends, and both flange portions 14 a are made of metal on the upper base plate 10 and the lower base plate 12. It is fastened and fixed via an annular mounting member 16.

In the second embodiment, the air in the clearance s between the coating layer 14 and the laminated body 8 functions as a heat insulating layer, so that the coating is performed as in the first embodiment. The thickness of the coating layer 14 can be reduced as compared with the case where the layer 14 is closely attached to the laminated body 8 and is integrally provided.

[0023]

As described above in the embodiments, according to the fire resistant structure of the laminated rubber bearing according to claim 1 of the present invention , the foamed fireproof composition covering the periphery of the laminated rubber bearing. The rubber material of No. 2 has elasticity equivalent to that of the laminated rubber bearing under normal conditions, and can not only follow the displacement of the laminated rubber bearing sufficiently, but it also has a number when heated to a certain temperature or higher due to a fire. It expands by a factor of 2 to several tens of times to form a carbonized layer having excellent heat insulating properties, and this carbonized layer serves as a fire resistant heat insulating layer to protect the laminated rubber bearing inside.

Further, in forming the coating, for example, a simple operation of winding a sheet-shaped rubber material of a foam-type fireproof composition in a desired thickness according to a required fireproof time is required, and since it is a synthetic rubber, it is laminated. It is also possible to form it integrally with the outer periphery of the rubber bearing when it is manufactured, and it can be easily installed without any trouble.

Also, upon restoration, it is possible to simply remove the foamed and expanded and carbonized coating layer and re-wrap a new sheet-shaped rubber material of the foam-type fireproof composition to a desired thickness. Further, the laminated gourd according to claim 2 of the present invention.
According to the fire-resistant structure of the bearing, the space between the coating layer and the laminate is
The air in the clearance part functions as a heat insulating layer.
Therefore, in the case where the coating layer is closely attached to the laminated body and is integrally provided,
The coating layer can be thinner than
It

[Brief description of drawings]

FIG. 1 is a first view of a fire resistant structure of a laminated rubber bearing according to the present invention.
It is a fragmentary sectional view showing an example.

FIG. 2 is a second view of the fire resistant structure of the laminated rubber bearing according to the present invention.
It is a fragmentary sectional view showing an example.

[Explanation of symbols]

2 Laminated rubber support 4 rubber plate 6 metal plate 10 Upper base plate 12 Lower base plate 14 Coating layer (rubber material of foam type fireproof composition)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nagao Hori               4-640 Shimoseido, Kiyose City, Tokyo Stock               Inside the Obayashi Technical Research Institute (72) Inventor Koichiro Takahashi               4-640 Shimoseido, Kiyose City, Tokyo Stock               Inside the Obayashi Technical Research Institute                (56) Reference JP-A-2-258317 (JP, A)                 JP-A-6-25476 (JP, A)                 Japanese Patent Laid-Open No. 2-80468 (JP, A)                 JP-A-7-53882 (JP, A)                 Actual Kaihei 3-8531 (JP, U)

Claims (2)

(57) [Claims] 1. A foam-type fireproof material which expands and expands around a laminated rubber bearing body in which a rubber plate and a metal plate are sequentially stacked to be laminated and integrated when heated to a predetermined temperature or higher to form a fireproof carbonized layer . Fire resistance of a laminated rubber bearing characterized in that it is coated with a rubber material of the composition, and the foamable fireproof composition is made of polyisobutylene rubber having a reactive silicon group containing a polyphosphate compound. Construction. 2. A foam-type fireproof material which expands and expands around a laminated rubber support body in which a rubber plate and a metal plate are sequentially stacked and laminated and integrated when heated to a predetermined temperature or higher to form a fireproof carbonized layer . The foamable fireproof composition coated with a rubber material of the composition
Is a polymer having a reactive silicon group containing a polyphosphate compound.
It is made of lyisobutylene rubber, and the coating layer is provided with a clearance between it and the laminated body, and the coating layer is in the shape of a cylinder having flange portions that radially expand outward at both upper and lower ends. A fire-resistant structure for a laminated rubber bearing, characterized in that both flange portions are formed and fastened and fixed to an upper base plate and a lower base plate, which are attached to the upper and lower ends of the laminated body, by means of annular fittings.