JP5086178B2 - Fireproof joint material - Google Patents

Description

The present invention relates to a fireproof joint material for construction. In particular, the present invention relates to a fireproof joint material using a heat-expandable fireproof material.

When a fireproof treatment is performed on a wall surface formed of a panel body, a fireproof joint material is fitted and fixed to a joint portion formed between the panels. For example, in Patent Document 1, a metal plate is bent into a U-shaped cross section to form a long base material, and a fireproof joint material is provided with a flame retardant coating that foams by heating on the surface of the base material. It is disclosed that a fireproofing process is performed on joints.
JP-A-8-158493

However, the fireproof joint material using a metal base material with such a U-shaped cross section is poor in flexibility in the width direction of the joint material, so insertion into the joint due to variations in the width of the joint and the fireproof joint material. May become difficult, and conversely, fixing to the joints may be insufficient.

Also, even if a thermally expandable refractory material is applied to both sides of a metal base material having a U-shaped cross section, the refractory material on the back side of the wall surface of the metal base material does not help to form an effective fireproof thermal insulation layer. There was a fear. Moreover, the expansion of the refractory material on the back side of the metal base material causes the metal base material to be pushed out. There was a risk of it.

Therefore, the present invention provides a fireproof joint material that can be easily and reliably inserted into and fixed to the joint part, and that can reliably form a fireproof heat insulating layer on the joint part by an expanded thermally expandable fireproof material in the event of a fire. The purpose is to provide.

As a result of intensive studies, the inventor has found that the above-mentioned problem can be solved by embedding and integrating a metal strip having a specific shape in a thermally expandable refractory material, and has completed the present invention. .

The present invention is an elongate refractory joint material formed of a thermally expandable refractory material having elasticity and having a U-shaped cross section in a part of its cross section, and a pair of the U-shaped cross sections. A fireproof joint material characterized in that a pair of metal strips are embedded and integrated at the end portion, and the pair of metal strips are separated from each other at the connecting portion of the U-shaped cross section. .

The metal strip may be provided with a bent portion that is embedded and integrated in the connecting portion of the U-shaped cross section (Claim 2).

Further, the present invention is a long refractory joint material formed of a thermally expandable refractory material having elasticity and having a U-shaped cross section in a part of its cross section, A metal strip having a corresponding cross-sectional shape is embedded and integrated, and the metal strip is provided with a plurality of holes in a portion embedded in the connection portion of the U-shaped cross section. (Claim 3).

The end of the metal strip may be folded back toward the outside of the U-shaped cross section and embedded in the thermally expandable refractory material (Claim 4).

According to the present invention, since the metal strips are separated from each other at the connection portion of the U-shaped cross section of the refractory joint material, the refractory joint material becomes flexible in the width direction, and the joint material is inserted and fixed. Can be easily and reliably performed. In addition, even when the thermally expandable refractory material on the back side of the wall surface of the metal strip expands, the expanded refractory material flows to the outside of the wall surface through the above-mentioned separation portion, and contributes effectively to the formation of a refractory heat insulation layer on the joint To do.

Furthermore, as a preferable aspect of the present invention, when a bent portion is provided in the metal strip, and is embedded and integrated in the connecting portion of the U-shaped cross section (Claim 2), the refractory in which the bent portion is expanded is provided. It is possible to prevent the material from scattering and collapsing and to obtain a strong fireproof heat insulating layer.

In the invention of claim 3, since the same effect as that of the invention of claim 1 can be obtained and the metal strip can maintain its shape independently after the refractory material expands, the refractory joint material Can be more reliably prevented from separating from the joint.

Furthermore, as a preferred aspect of the present invention, when the metal strip is provided with a folded portion that is folded toward the outside of the U-shaped cross section (Claim 4), the refractory joint material is detached from the joint portion. Can be more reliably prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The fireproof joint material in the present invention is a long rod-shaped member having a predetermined cross section, and FIG. 1 shows a cross-sectional view of the first embodiment of the present invention.

In this embodiment, the fireproof joint material 1 is formed of a thermally expandable refractory material 2 having elasticity, and a long metal strip that is bent into a substantially “Z” -shaped cross section inside thereof. A pair of 3 and 3 is embedded and integrated. At both ends of the U-shaped cross-sectional portion, which is the main part of the refractory joint material 1, folded portions 2a, 2a formed so as to be bent outside the U-shape are provided adjacent to each other. The U-shaped cross-sectional portion is composed of a pair of end portions 2c, 2c and a connecting portion 2d that connects both end portions, and is adjacent to the portion where the end portion 2c and the connecting portion 2d are connected. Protrusions 2b and 2b having a shape in which the connecting portion 2d extends toward the outer side of the projection are provided.

The metal strips 3 and 3 having a corresponding cross-sectional shape so as to be embedded in the refractory joint material 1 have a main body portion 3c embedded in the end portion 2c and are embedded in the folded portion 2a. It is a long strip obtained by bending a thin metal plate into a substantially “Z” shape so as to have a folded portion 3a and a folded end portion 3d embedded in the connecting portion 2d. As a material for the metallic strip, a stainless plate, an iron plate, a steel plate, an aluminum plate, or the like can be used.

The heat-expandable refractory material 2 used in the present invention is a heat-expandable refractory material having rubber-like elasticity, and is a resin composition mainly composed of a resin material and an expandable material.
As the resin material, particularly elastic rubber or resin is used. That is, butadiene rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, natural rubber, isoprene rubber, ethylene propylene rubber, butyl rubber, acrylic rubber, urethane rubber, silicone rubber, fluorine rubber, thermoplastic elastomer, α-olefin copolymer, ethylene copolymer Etc. are exemplified.
You may use the said resin material individually or in mixture as appropriate.

In addition, the resin materials include polyolefin resins, polyester resins, polycarbonate resins, polystyrene resins, acrylic resins, acrylonitrile styrene butadiene resins, polyamide resins, epoxy resins, phenol resins, etc. A resin material may be mixed. Since the phenolic resin is cured and carbonized by heating, mixing the phenolic resin as a resin material prevents the heat-expandable refractory material 2 from being easily softened and deformed when exposed to a flame, It is effective for reliably forming a fireproof heat insulating layer.

As the expansion material, an expansion material that expands by heating, such as thermally expandable graphite or a foamable nitrogen compound, can be used. Among them, it is desirable to use conventionally known heat-expandable graphite as the expansion material because the expansion ratio of the composition can be increased. It is desirable to use heat-expandable graphite that has been neutralized so as not to react with a phosphorus compound described later. A preferable expansion ratio of the expansion material in the present invention is 2.5 to 200 times, more preferably 5 to 150 times in terms of volume expansion coefficient.

In addition to the heat-expandable refractory material in the present invention, the following can be added as needed.

Addition of phosphorus compounds such as red phosphorus, phosphate esters, metal phosphates, and ammonium polyphosphates can increase flame retardancy and improve the fireproof and heat insulating effect. Addition of ammonium polyphosphate is particularly preferable.

When a hydrous inorganic substance such as aluminum hydroxide or magnesium hydroxide is added, a dehydration reaction occurs during heating, and the heat-insulating performance can be improved by the endothermic action of the generated water.

The preferable degree of elasticity of the heat-expandable refractory material 2 for giving appropriate elasticity to the refractory joint material 1 is A10 to A90, more preferably A30 to A80 in terms of rubber hardness of durometer type A according to JIS K 6253. is there.

The preferable range of the volume expansion coefficient during heating of the thermally expandable refractory material 2 in the present invention is 2 to 40 times, and more preferably 5 to 30 times. If the expansion ratio is low, it is uneconomical because a large amount of heat-expandable refractory material is required to ensure fireproof performance, and if the expansion ratio is too high, the expanded refractory material tends to be dissipated and formed. The refractory thermal insulation layer becomes brittle.

As an example of the heat-expandable refractory material 2 blended with the above components, 100 parts by weight of ethylene propylene rubber, 100 parts by weight of neutralized heat-expandable graphite, 5 parts by weight of ammonium polyphosphate, and 40 parts by weight of process oil An example is a rubber composition having a rubber hardness after blending of A60.

Hereinafter, the manufacturing method of the fireproof joint material of this invention is demonstrated.
First, a predetermined raw material is blended and kneaded to prepare a thermally expandable refractory material. If the resin material of the thermally expandable refractory material is a rubber material to be crosslinked, an uncrosslinked thermally expandable refractory material is prepared. Thereafter, the thermally expandable refractory material and the metal strip 3 serving as the base material are supplied to the extrusion molding machine, and the metal strip 3 is embedded in the thermally expandable refractory material 2. The heat-expandable refractory material 2 is extruded together with the strip 3 in a predetermined cross-sectional shape. At that time, the metal strip may be cut into a predetermined length and bent so as to have a predetermined cross-sectional shape, or a tape-shaped metal strip may be continuously supplied and extruded. Bending may be performed by a bending die immediately before processing. Thereafter, the extruded fire-resistant joint material is cross-linked by heating or the like, and the metal strip and the heat-expandable fire-resistant material are integrated.

The manufacture of the refractory joint material 1 is not limited to extrusion molding, and may be manufactured by sticking a heat-expandable refractory material formed into a sheet shape by a roller or pressing to a metal strip. According to the above, it is more preferable that the metal strip 3 can be embedded in the thermally expandable refractory material 2 easily and reliably. When the metal strip 3 is embedded in the thermally expandable refractory material 2, it is possible to reliably prevent the metal strip and the thermally expandable refractory material from separating from each other. In addition, it is possible to prevent the refractory material expanded by heating from being scattered apart and to form a strong refractory heat insulating layer.

Hereinafter, the usage method of the fireproof joint material 1 of this invention and its effect are demonstrated.
In FIG. 2, sectional drawing of the wall surface joint part in which the fireproof joint material 1 is used is shown. The upper side of the figure is the outside of the wall part, and the lower side of the figure is the inside of the wall part. In the joint portion, the panel members 4 and 4 are attached to the structural member 5 such as a pillar to constitute the joint portion 6, but detailed description of the attachment structure is omitted. The refractory joint material 1 is pushed into the joint portion 6 so that the connecting portion 2d having a U-shaped cross section is located outside the panel, that is, the wall portion. Preferably, as shown in the drawing, the folded portion 2a is preferably pushed so as to be locked to the back side of the panel end, and a member that restricts pushing so that the joint material 1 is not pushed too much is used. It is preferred that After the fireproof joint material 1 is pushed into the joint portion 6, the remaining space of the joint portion 6 is filled with the sealer 7, and the joint portion is fire-resistant.

In the present invention, since the pair of embedded metal strips 3 and 3 are provided so as to be separated from each other in the connecting portion 2d of the U-shaped cross section of the joint material, the width of the fireproof joint material 1 The rigidity in the direction can be made relatively low, and even if the joint portion 6 varies in width, it can be easily inserted. In addition, since the fireproof joint material 1 is formed by the heat-expandable fire-resistant material 2 having elasticity, the fireproof joint material 1 is rich in elasticity, and the repulsive force can be obtained simply by pushing the fire joint material 1 into the joint portion 6. Thus, the fireproof joint material 1 can be fixed to the joint part 6.

When hot air blows on the wall surface in the event of a fire or the like, first, the sealer 7 is heated, and further, the refractory joint material 1 of the present invention is heated. Then, the heat-expandable refractory material 2 of the refractory joint material 1 is expanded toward the outside of the wall surface by heating to form a refractory heat insulation layer so as to fill the joint portion 6.

In the present invention, the pair of embedded metal strips 3 are provided so as to be separated from each other at the connecting portion 2d of the U-shaped cross section of the joint material. Even if the thermally expansive refractory material on the back side (the lower side of FIG. 2) expands, the expanded refractory material can flow toward the outside of the wall surface through this separated portion, and is closer to a flame or hot air A refractory heat insulating layer can be formed on the side. Moreover, it is prevented that the metal strip 3 is pushed out from the joint part 6 by the refractory material expanded on the back side of the wall surface of the metal strip 3, and the refractory heat insulating material 1 falls off from the joint part in the event of a fire. It is prevented.

In the present embodiment, since the metal strip 3 has the bent end portion 3d embedded in the connecting portion 2d of the U-shaped cross section of the refractory joint material 1, the bent end portion 3d expands. It plays the role of an anchor embedded in the refractory member, and the formed refractory heat insulating layer can be made strong. Further, the protrusions 2b and 2b are portions that come into contact with the end of the wall panel (joint portion) when inserted into the wall joint portion, and serve to hold and fix the fireproof joint material 1 at an intended position. In addition, the sealer 7 also functions to seal so that the sealer 7 does not leak to the back side of the wall during construction of the joint.

Although the embodiment of the present invention has been described above, the present invention can be modified and implemented within a range that does not greatly change its properties, and can also be configured as follows.

FIG. 3 shows a second embodiment of the present invention. FIG. 3 is a perspective view in which a part of the heat-expandable refractory material 2 is peeled off to show the metal strip 3 ′ so as to show the structure of the refractory joint material 1 ′. In the present embodiment, the metal strip 3 ′ is a single strip having a substantially U-shaped cross section corresponding to the cross-sectional shape of the refractory joint material 1 ′, and the protruding portion 2b ′ is the folded portion. Although it is different from the first embodiment in that it is provided obliquely in the direction of preventing disconnection as in 2a, the other points are the same and the detailed description thereof is omitted. The metal strip 3 ′ is provided with a connecting portion 3d ′ between the main body portions 3c and 3c to form a substantially U-shaped cross section. The connecting portion 3d ′ includes a plurality of holes 3e ′, 3e 'is connected along the length direction of the strip. Such a strip can be obtained by continuously forming holes in a tape-like metal plate by punching and bending the metal plate.

According to the present embodiment, as in the first embodiment, the fireproof joint material 1 ′ can be made flexible in the width direction, and at the same time, the fireproof material expanded through the holes 3e ′ and 3e ′ in the event of a fire or the like. The material can be flowed toward the outside of the wall surface, and the refractory material can be used to form the refractory heat insulation layer more effectively.
Furthermore, in the present embodiment, the metal strip 3 ′ is a single metal strip connected by the connecting portion 3d ′, so that its shape can be maintained independently, and the thermally expandable refractory material Even after the expansion, the fireproof joint material 1 ′ can be reliably fixed to the back part of the joint part 6.

As shown in FIG. 4 as the third embodiment, the bent end 3d of the metal strip of the first embodiment (FIG. 1) and the metal strip of the second embodiment (FIG. 3). It is also possible to eliminate the connecting portion 3d ′ and to configure the metal strip 3 ′ ′ only by the main body portion 3c and the folded portion 3a.

The U-shaped cross section, which is the main part of the cross section of the refractory joint material of the present invention, is provided with a pair of end portions 2c and 2c substantially parallel to each other as shown in the first and second embodiments. As shown in the third embodiment (FIG. 4), the taper shape is such that the distance between the pair of end portions 2c and 2c becomes narrower as the distance from the connecting portion 2d increases. You can also By making the U-shaped cross section tapered, the workability when inserting the fireproof joint material into the joint portion of the wall surface is improved.

When the folded portion 3a is provided on the metal strip 3 as in the first to third embodiments, the refractory joint material 1 ′ is fixed to the back of the joint portion 6 even after the thermally expandable refractory material expands. Although it is effective to continue, it is possible to eliminate the folded portion 3 a at the end of the metal strip 3.

According to the fireproof joint material of the present invention, it can be used for fireproofing in the joint portion of the butt portion of the wall panel, and can be easily and reliably inserted and fixed into the joint portion. The fireproof joint material which can form a fireproof heat insulation layer reliably in a joint part with material can be provided.

It is sectional drawing which shows the structure of the fireproof joint material of this invention embodiment. It is sectional drawing which shows the construction state of the fireproof joint material of this invention. It is a perspective view which shows the structure of 2nd Embodiment of this invention. It is sectional drawing which shows the structure of 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1 'Refractory joint material 2 Thermal expansion refractory material 2a Folding part 2b Protruding part 2c Terminal part 2d Connection part 3, 3' Metal strip 3a Folding part 3c Main-body part 3d Bending edge part b
3d 'connecting part 3e' hole 4 wall panel 5 wall structure member 6 joint 7 sealer

Claims (4)

It is formed of a thermally expandable refractory material having elasticity, and is a long refractory joint material having a U-shaped cross section in a part of its cross section,
While a pair of metal strips are embedded and integrated in the pair of end portions of the U-shaped cross section,
The fireproof joint material, wherein the pair of metal strips are spaced apart from each other in the connection portion of the U-shaped cross section. The fireproof joint material according to claim 1, wherein the metal strip is provided with a bent portion that is embedded and integrated in a connecting portion having a U-shaped cross section. It is formed of a thermally expandable refractory material having elasticity, and is a long refractory joint material having a U-shaped cross section in a part of its cross section,
A metal strip having a cross-sectional shape corresponding to the U-shaped cross-section is embedded and integrated,
A fireproof joint material, wherein the metal strip is provided with a plurality of holes in a portion embedded in the connecting portion of the U-shaped cross section. 4. The fireproof joint according to claim 1, wherein the end portion of the metal strip is folded toward the outside of the U-shaped cross section and embedded in the thermally expandable fireproof material. Wood.

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