JP2000282598A - Fireproof structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient fireproof performance by attaching the steel frame structural member of an attic space on the ceiling member of a collectively fireproof coated building by surrounding an embedded illuminator with the thermal expansion composite sheet of prescribed fireproof performance. SOLUTION: Butyl rubber, polybutene, water-added kerosene resin, neutralization-treated thermal expansion graphite, ammonium polyphosphate and aluminum hydroxide are melted and kneaded by two rollers to form an adhesive thermal expansion fireproof sheet 81. When the thermal expansion fireproof sheet 81 is irradiated at the heating value of 50 kw/m2 for 30 minutes, the change of thickness is 1.1-30 times. The thermal expansion fireproof sheet 81 is laminated on a hot dip zinc-coated steel plate 82 to form a thermal expansion composite sheet 8. A steel frame member arranged in an attic space is provided on the fireproof ceiling material 7 of a collectively fireproof coated building, a cylindrical housing part with a top board arranging the thermal expansion composite sheet 8 is previously provided, and an embedded illuminator 1 is attached thereto, thereby secures sufficient fireproofness of the attic space 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof structure for a steel structure building.

[0002]

2. Description of the Related Art Conventionally, a building (three-story building, hospital, hotel, boarding house, etc.) having three stories or more must have a fireproof structure having a predetermined fireproof performance based on the Building Standard Law. In order to impart fire resistance to a steel structure building, a method has been adopted in which steel columns and beams used in the main structure are individually coated with a fire-resistant material one by one.

[0003] On the other hand, a construction method has been devised in which steel columns and beams used in main structural parts are collectively protected from heating in the event of a fire by using ceiling materials having high fire resistance. . Although this method has an advantage that it is not necessary to cover columns and beams individually with a refractory material, it is not satisfactory in terms of workability and cost.

In addition, in the fire-resistant structure for protecting the steel columns and beams in a lump, a large hole needs to be formed in the ceiling material, especially when an embedded lighting fixture is to be installed in the ceiling material. However, since the fire resistance is only deteriorated, there is a problem that the fire resistance cannot be ensured unless the steel beams and columns are individually coated with fire resistance to form a fire resistant structure.

[0005] In particular, when attempting to mount an embedded lighting fixture on the ceiling, a large hole must be formed in the ceiling. As a result, the steel columns and beams must be individually coated with a refractory material. However, there is a problem that fire resistance cannot be ensured.

[0006]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a structure in which a steel structural member disposed in a space above a ceiling formed between an upper floor material and a lower floor ceiling material is fireproof. It is an object of the present invention to provide a fire-resistant structure of a building in which a fire-proof performance can be ensured even when an embedded lighting device is attached to a lower surface of a ceiling material in a covered fire-resistant structure.

[0007]

The fireproof structure of a building according to the present invention comprises a space above the ceiling made of a fireproof floor material on the upper floor, a fireproof ceiling material on the lower floor, and a fireproof wall material. In a fire-resistant structure of a building in which the steel structural members provided in the fire-resistant covering are collectively covered, an embedded lighting fixture is attached to the fire-resistant ceiling material side, and the lighting fixture is made of a metal plate and a heat-expandable fire-resistant sheet. Characterized by being surrounded by a thermally expandable composite sheet comprising a laminate of

Hereinafter, the present invention will be described in detail.

As shown in the schematic diagram of FIG. 1, the fireproof structure of the building according to the present invention has an under-ceiling space 10 formed between a fireproof floor material 3 on the upper floor and a fireproof ceiling material 6 on the lower floor. The lighting fixture 1 of the embedded type is attached to the fire-resistant ceiling material 6 side, and the heat-expandable composite sheet 3 is arranged around the lighting fixture 1.

The space 10 above the ceiling is surrounded by the fire-resistant floor material 3 on the floor, the fire-resistant ceiling material 6 and the fire-resistant wall material 9 below the floor, and is arranged in the space 10 above the ceiling. Since the fire resistance can be provided to the steel structure members collectively, it is not necessary to individually cover the steel structure members with fire resistance.

In FIG. 1, the non-combustible floor member 4 is supported by a steel beam 3 extending in a direction perpendicular to the drawing.
Is fixed to the field edge 6 erected along
The ridge 6 is fixed by a ridge receiver 5 extending in a direction perpendicular to the drawing.

The non-combustible ceiling material is, for example, 21
A single plate such as a reinforced gypsum board having a thickness of 25 mm, a calcium silicate plate having a thickness of 25 mm, or the like; a laminate of a normal gypsum board or a calcium silicate plate having a thickness of 5 mm, a ceramic blanket, rock wool felt, or the like is used. As the non-combustible flooring, for example, a flooring having a high fire resistance such as a 100 m-thick ALC plate or a 100 m-thick precast concrete plate is used.

[0013] As a material of the field edge receiver 5 and the field edge 6,
For example, a metal material having high fire resistance is preferable.

As shown in FIG. 1, the embedded lighting fixture 1 is mounted on the ceiling material 3 side, and a metal plate 81
In order to dispose the heat-expandable composite sheet 8 composed of a laminate of the heat-expandable refractory sheet 82 and the heat-expandable refractory sheet 82, the storage section 2 in which the heat-expandable composite sheet 8 has been previously formed into a cylindrical shape with a top plate is placed below the ceiling material 3. May be worn.

In the case where a molded article of the heat-expandable composite sheet 8 is used as the storage section 2, it is preferable that the heat-expandable refractory sheet 82 is arranged above the storage section 2 without any gap. The shape of the storage portion 2 is not particularly limited as long as it is a cylindrical shape with a top plate, and may be any shape such as a cylinder and a square tube.

The storage section 2 can be attached to the ceiling member 3 by fastening a flange formed by bending an end of the metal plate 81 with a screw or the like.

Examples of the metal plate include an iron plate, a stainless steel plate, a galvanized steel plate, and an aluminum-zinc alloy-plated steel plate. The thickness of the metal plate is preferably 0.2 to 1 mm. It is preferable to apply plating or coating coating on the surface of the metal plate because long-term durability and design properties are improved.

The thickness of the heat-expandable composite sheet 8 is 0.3
〜5 mm is preferred. If the thickness is less than 0.3 mm, a thermal insulation layer having a sufficient thickness is not formed due to thermal expansion, and the
If it exceeds m, the weight becomes heavy and handling becomes difficult.

For the purpose of improving workability, a nonwoven fabric, a woven fabric, a resin film, or the like may be laminated on the heat-expandable refractory sheet 82 side of the heat-expandable composite sheet 8. Furthermore, the heat-expandable refractory sheet 8 of the heat-expandable composite sheet 8
An inorganic material layer 21 may be provided on the second side (on the nonwoven fabric surface when the nonwoven fabric is laminated).

The method of laminating the heat-expandable refractory sheet and the metal plate is not particularly limited. If the heat-expandable refractory sheet has adhesiveness, the adhesive may be used for lamination and fixing. If the heat-expandable refractory sheet has no adhesive strength,
It can be glued using an adhesive. In particular, when the resin component is an epoxy resin described later, if the resin component is laminated on a metal plate before the epoxy resin is cured, it can be adhered to the metal plate during curing.

As the above-mentioned inorganic material, for example, plate materials such as gypsum board, calcium silicate plate, wood chip cement plate and the like; non-combustible nonwoven fabrics such as ceramic blanket, rock wool felt, glass wool heat insulating material and the like are preferable.

As the plaster board, for example, JIS
A Plain gypsum board (GB-
R), decorative gypsum board (GB-D) specified in JIS A 6911, waterproof gypsum board (GB-S) specified in JIS A 6912, reinforced gypsum board (GB-F) specified in JIS A 6913 , JIS A6
The sound-absorbing gypsum board (GB-P) specified in 301 is mentioned.

As the above-mentioned heat-expandable refractory sheet, a resin composition containing a heat-expandable inorganic substance, a resin composition (I) containing a thermoplastic resin and / or a rubber substance, or a resin composition containing an epoxy resin Those formed from product (II) are preferred. The heat-expandable refractory sheet made of the above resin composition is easily deformed following bending of a metal plate or the like, so that workability is improved. In addition, the heat-expandable refractory sheet made of a resin composition containing an epoxy resin has improved flame retardancy.

Examples of the resin composition containing the heat-expandable inorganic substance include a resin composition containing a resin component, a heat-expandable inorganic substance, and other inorganic components. Examples of the resin component include a thermoplastic resin described later. Resins, rubber substances, epoxy resins and the like can be mentioned. As the thermally expandable inorganic substance,
For example, neutralized heat-expandable graphite, vermiculite and the like can be mentioned.

As the resin composition (I) containing the thermoplastic resin and / or the rubber substance, the thermoplastic resin and / or
Alternatively, a rubber material, a phosphorus compound, neutralized heat-expandable graphite or vermiculite, and an inorganic filler are preferable.

The thermoplastic resin and / or rubber material is not particularly limited. For example, a polypropylene resin,
Polyolefin resins such as polyethylene resins; poly (1-) butene resins, polypentene resins, polystyrene resins, acrylonitrile-butadiene-styrene resins, polycarbonate resins, polyphenylene ether resins, acrylic resins, polyamide resins , Polyvinyl chloride resin, phenol resin, polyurethane resin, polybutene, polychloroprene, polybutadiene, polyisobutylene, butyl rubber, nitrile rubber and the like.

[0027] The thermoplastic resin and / or rubber substance may be:
They may be used alone or in combination of two or more. A blend of two or more resins may be used as the base resin in order to adjust the melt viscosity, flexibility, tackiness, etc. of the resin.

The thermoplastic resin and / or rubber substance may be further crosslinked or modified within a range that does not impair the fire resistance of the heat-expandable fire-resistant sheet of the present invention.
The method for cross-linking the thermoplastic resin and / or rubber substance is not particularly limited, and a cross-linking method generally performed on the thermoplastic resin or rubber substance, for example, a cross-linking method using various cross-linking agents, peroxides, etc., an electron beam A cross-linking method by irradiation and the like can be mentioned.

The phosphorus compound is not particularly limited.
For example, red phosphorus; various phosphates such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylendiphenyl phosphate; phosphorus such as sodium phosphate, potassium phosphate, and magnesium phosphate Acid metal salts; ammonium polyphosphates; and compounds represented by the following general formula (1). Among these, from the viewpoint of fire resistance, red phosphorus, ammonium polyphosphates, and compounds represented by the following general formula (1) are preferable, and ammonium polyphosphates are more preferable in terms of performance, safety, cost, and the like. preferable.

[0030]

Embedded image

In the formula, R ¹ and R ³ are hydrogen, C ¹ -C 1
It represents a 16 linear or branched alkyl group or an aryl group having 6 to 16 carbon atoms. R ² is a hydroxyl group, a linear or branched alkyl group having 1 to 16 carbon atoms, a linear or branched alkoxyl group having 1 to 16 carbon atoms,
Represents an aryl group having 6 to 16 carbon atoms or an aryloxy group having 6 to 16 carbon atoms.

The above-mentioned red phosphorus enhances the flame-retardant effect when added in a small amount. As the red phosphorus, commercially available red phosphorus can be used, but from the viewpoint of moisture resistance, safety such as not spontaneously igniting during kneading, those obtained by coating the surface of red phosphorus particles with a resin are preferably used. .

The above ammonium polyphosphates are not particularly limited, and include, for example, ammonium polyphosphate and melamine-modified ammonium polyphosphate. Of these, ammonium polyphosphate is preferably used from the viewpoint of handleability and the like. Commercially available products include, for example, "AP422" and "AP462" manufactured by Clariant, "Sumisafe P" manufactured by Sumitomo Chemical Co., "Terage C60" manufactured by Chisso,
"Terage C70", "Terage C80", and the like.

The compound represented by the above general formula (1) is not particularly restricted but includes, for example, methylphosphonic acid, dimethylmethylphosphonate, diethylmethylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methylpropyl Phosphonic acid, t-butylphosphonic acid, 2,3-dimethyl-butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphinic acid, dioctyl Examples include phosphinic acid, phenylphosphinic acid, diethylphenylphosphinic acid, diphenylphosphinic acid, and bis (4-methoxyphenyl) phosphinic acid. Among them, t-butylphosphonic acid is expensive, but is preferable in terms of high flame retardancy.
The above phosphorus compounds may be used alone or in combination of two or more.

The neutralized heat-expandable graphite is obtained by neutralizing heat-expandable graphite which is a conventionally known substance. The heat-expandable graphite is a natural scale-like graphite, pyrolytic graphite, powder such as quiche graphite,
Produced by treating with inorganic acids such as concentrated sulfuric acid, nitric acid, and selenic acid and strong oxidizing agents such as concentrated nitric acid, perchloric acid, perchlorate, permanganate, dichromate, and hydrogen peroxide. It is a graphite intercalation compound that is a crystalline compound while maintaining a layered structure of carbon.

The heat-expandable graphite obtained by the acid treatment as described above is further neutralized by neutralizing with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound and the like. The heat-expandable graphite is used.

The aliphatic lower amine is not particularly restricted but includes, for example, monomethylamine, dimethylamine,
Trimethylamine, ethylamine, propylamine, butylamine and the like. The alkali metal compound and the alkaline earth metal compound are not particularly limited,
For example, hydroxides, oxides, carbonates, sulfates, organic acid salts of potassium, sodium, calcium, barium, magnesium and the like can be mentioned.

Commercial products of the neutralized heat-expandable graphite include, for example, "CA-60S" manufactured by Nippon Kasei Co., Ltd., "GREP-EG" manufactured by Tosoh Corporation, and "GRAF" manufactured by UCAR Corporation.
GUARD "and the like.

The particle size of the neutralized heat-expandable graphite is preferably 20 to 200 mesh. When the particle size is smaller than 200 mesh, the degree of expansion of graphite is small, a predetermined refractory insulation layer cannot be obtained, and when the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large,
When kneaded with a thermoplastic resin and / or a rubber substance, dispersibility deteriorates, and deterioration of physical properties cannot be avoided.

The inorganic filler is not particularly limited.
For example, metal oxides such as alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, and ferrites; calcium hydroxide, magnesium hydroxide, aluminum hydroxide, hydrotalcite, and the like. Hydrous minerals; basic metal carbonates such as magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, barium carbonate; calcium salts such as calcium sulfate, gypsum fiber, calcium silicate; silica, diatomaceous earth, dawsonite, barium sulfate ,
Talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun , Charcoal powder, various metal powders, potassium titanate, magnesium sulfate "MOS" (trade name), lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber , Fly ash, dehydrated sludge and the like. These may be used alone or in combination of two or more.

As the inorganic filler, a combination of a water-containing inorganic substance and a metal carbonate is particularly preferable. Since the hydrated inorganic substance and the metal carbonate function as an aggregate, it is considered that they contribute to the improvement of the residue strength and the increase of the heat capacity.

Further, the above-mentioned hydrated inorganic substance is endothermic due to water generated by the dehydration reaction during heating, and the temperature rise is reduced to obtain high heat resistance. Also, oxide remains as a heating residue. This is particularly preferable in that it works as an aggregate to improve the residue strength. Among them, magnesium hydroxide and aluminum hydroxide have different temperature ranges in which the dehydrating effect is exhibited, so when used in combination, the temperature range in which the dehydrating effect is exhibited becomes wider, and a more effective temperature rise suppressing effect is obtained, so that the combination is used. Is preferred.

Further, the above-mentioned metal carbonates such as calcium carbonate and zinc carbonate are considered to promote expansion by reaction with the above-mentioned phosphorus compound. Particularly, when ammonium polyphosphate is used as the phosphorus compound, a high expansion effect is obtained. Is obtained.
In addition, it acts as an effective aggregate and forms a residue having high shape retention after burning.

The particle size of the inorganic filler is 0.5 to
100 μm is preferable, and more preferably, about 1 to 50 μm.
m. Further, it is more preferable to use a combination of an inorganic filler having a large particle size and a small filler having a small particle size. By using the combination, it is possible to achieve high packing while maintaining the mechanical performance of the sheet. .

As a commercially available product of the above-mentioned hydrous inorganic substance, for example, aluminum hydroxide “H-4” having a particle size of 1 μm is used.
2M "(manufactured by Showa Denko KK)," H-31 "with a particle size of 18 µm
(Manufactured by Showa Denko KK).

Examples of the commercially available calcium carbonate include "Whiteton SB Red" having a particle size of 1.8 μm (manufactured by Shiraishi Calcium Co., Ltd.) and "BF300" having a particle size of 8 μm (manufactured by Shiraishi Calcium Co., Ltd.). .

The amount of the phosphorus compound and the neutralized heat-expandable graphite in the resin composition (I) (the total amount of both) is 100 parts by weight of the thermoplastic resin and / or synthetic rubber. 20 to 500 parts by weight are preferred. If the total amount of the phosphorus compound and the neutralized thermally expandable graphite is less than 20 parts by weight, sufficient thermal expandability cannot be obtained, and 500
When the amount exceeds the weight part, uniform dispersion becomes difficult, so that it is difficult to construct a uniform thickness, and the construction method is limited.

The weight ratio between the neutralized heat-expandable graphite and the phosphorus compound (heat-expandable graphite / phosphorus compound) is as follows:
0.01 to 9 is preferred. If the ratio of the heat-expandable graphite increases, the expanded graphite during combustion scatters and a sufficient refractory heat-insulating layer is not formed.If the ratio of the phosphorus compound increases, a sufficient refractory heat-insulating layer is not formed. Heat insulation cannot be obtained.

The amount of the inorganic filler in the resin composition (I) is preferably 50 to 500 parts by weight based on 100 parts by weight of the thermoplastic resin and / or synthetic rubber. If the amount is less than 50 parts by weight, a fire-resistant expansion sheet having sufficient fire resistance cannot be obtained, and if it exceeds 500 parts by weight, the mechanical properties of the fire-resistant expansion sheet deteriorate.

The resin composition (II) containing the epoxy resin is preferably composed of an epoxy resin, a phosphorus compound, neutralized heat-expandable graphite and an inorganic filler.

The epoxy resin is not particularly limited, but is basically obtained by reacting a monomer having an epoxy group with a curing agent. Examples of the monomer having an epoxy group include monomers of a bifunctional glycidyl ether type, a glycidyl ester type, and a polyfunctional glycidyl ether type.

Examples of the bifunctional glycidyl ether type monomer include polyethylene glycol type, polypropylene glycol type, neopentyl glycol type, 1,6-hexanediol type, trimethylolpropane type, propylene oxide-bisphenol A type,
Monomers such as hydrogenated bisphenol A type are exemplified.

Examples of the glycidyl ester type monomer include monomers of hexahydrophthalic anhydride type, tetrahydrophthalic anhydride type, dimer acid type, p-oxybenzoic acid type and the like.

Examples of the polyfunctional glycidyl ether type monomer include phenol novolak type, orthocresol novolak type, DPP novolak type, and dicyclopentadiene / phenol type monomers.

These monomers having an epoxy group may be used alone or in combination of two or more.

As the curing agent, a polyaddition type or a catalyst type is used. Examples of the polyaddition type curing agent include polyamine, acid anhydride, polyphenol, and polymercaptan. Examples of the catalyst type curing agent include tertiary amines, imidazoles, Lewis acid complexes and the like.

The method for curing the epoxy resin is not particularly limited, and can be performed by a known method.

As the phosphorus compound, neutralized thermally expandable graphite and inorganic filler used in the resin composition (II), the same components as those used in the resin composition (I) are used. Can be

In the resin composition (II), if the amount of the phosphorus compound is too small, sufficient shape retention of the combustion residue cannot be obtained, and if the amount is too large, the mechanical properties are greatly reduced, and the resin cannot be used. So, epoxy resin 100
50 to 150 parts by weight based on parts by weight is preferred.

In the above resin composition (II), if the blending amount of the neutralized heat-expandable graphite is too small, sufficient thermal expansion property cannot be obtained, and if it is too large, the mechanical properties are greatly reduced. Epoxy resin 1
15 to 40 parts by weight per 100 parts by weight is preferred.

In the above resin composition (II), if the amount of the inorganic filler is too small, sufficient fire resistance cannot be obtained, and if the amount is too large, the mechanical properties are greatly reduced and the resin cannot be used. The amount is preferably 50 to 500 parts by weight based on 100 parts by weight of the resin.

Even if the resin composition itself is flame-retardant, if the shape retention is insufficient, the brittle combustion residue collapses and penetrates the flame, so that the shape retention is sufficient. The use of the resin composition greatly differs depending on whether or not. By using an epoxy resin as the resin, the resin itself forms a char (carbonized) layer during combustion, and forms a fire-resistant heat-insulating layer strong enough to maintain its shape.

In the above resin composition, the neutralized heat-expandable graphite expands by heating to form a refractory heat-insulating layer, thereby preventing heat transmission. By heating, the phosphorus compound dehydrates and foams, and also acts as a carbonization catalyst. The inorganic filler then contributes to an increase in heat capacity, and the phosphorus compound has the ability to retain the shape of the expanded heat insulating layer.

In the above resin composition, in addition to antioxidants such as phenol-based, amine-based and sulfur-based, metal harm inhibitor, antistatic agent, stabilizer, cross-linking agent, lubricant as long as the physical properties are not impaired. , A softener, a pigment and the like may be added.

The above-mentioned resin composition can be obtained by kneading the above-mentioned components using a known kneading device such as a Banbury mixer, a kneader mixer, or a two-roll mill. The resin composition can be formed into a heat-expandable refractory sheet by a conventionally known molding method such as press molding, extrusion molding, or calendar molding.

The above-mentioned heat-expandable refractory sheet has a thickness of 50 kW / m ^2.
(Thickness D ₁ after irradiation / thickness D ₀ before irradiation) is preferably 1.1 to 30 (times) when the heat amount is irradiated for 30 minutes. When the thickness change is less than 1.1 (fold), the fire resistance is insufficient, and when the thickness change exceeds 30 (fold), the strength of the fire-resistant heat-insulating layer formed by expansion by heating is reduced and easily collapsed.

In the present invention, the heat-expandable composite sheet disposed on the inner surface of the housing section expands and expands when exposed to a high temperature such as a fire to form a combustion residue. Is expressed.

[0068]

Embodiments of the present invention will be described below with reference to the drawings.

(Example 1) A resin composition containing butyl rubber, polybutene, hydrogenated petroleum resin, neutralized thermally expandable graphite, ammonium polyphosphate and aluminum hydroxide in the amounts shown in Table 1 was prepared. The roll was melt-kneaded to obtain a 1 mm thick heat-expandable refractory sheet having adhesiveness. This heat-expandable refractory sheet and a hot-dip galvanized steel sheet having a thickness of 0.3 mm were laminated to obtain a heat-expandable composite sheet.
In FIG. 1, the cross-sectional dimension is 400 mm × 200 mm × 8 m
100 supported by mx 13 mm H steel beam 4
A ceiling space 10 was formed by a floor material 3 made of an ALC plate having a thickness of mm, a ceiling material 7 made of a reinforced gypsum board having a thickness of 21 mm, and a wall material 9 made of a reinforced gypsum board having a thickness of 21 mm.

Separately, using a 12.5 mm thick gypsum board, the inner surface dimensions were 130 mm × 130 mm × 100 mm
After producing the (depth) square tube-shaped housing portion 2 with a top plate, the thermally expandable composite sheet 8 was attached to the entire inner surface of the housing portion 2 so that the galvanized steel sheet 81 side was on the outside. . Next, a hole of 130 mm square was made in the ceiling material 7,
The storage section 2 to which the heat-expandable composite sheet 8 is attached is inserted so that the opening is on the lower side, and the flange provided at the end of the hot-dip galvanized steel sheet 81 is screwed to form the storage section 2.
Was fixed at a position 150 mm below the H steel beam 4, and a 125φ embedded lighting device (“Downlight Sg type” manufactured by Sekisui Chemical Co., Ltd.) was mounted inside the device to obtain a fireproof structure.

Example 2 A resin composition comprising butyl rubber, polybutene, hydrogenated petroleum resin, neutralized thermally expandable graphite, ammonium polyphosphate, aluminum hydroxide, and calcium carbonate in the amounts shown in Table 1 The material was melt-kneaded with two rolls to obtain a 2 mm thick heat-expandable refractory sheet having tackiness. This heat-expandable refractory sheet is used for 0.4
A thermally expandable composite sheet was obtained by laminating on a colored galvanized steel sheet having a thickness of mm. Using the above-mentioned thermally expandable composite sheet, FIG.
As shown in the figure, the inner surface dimension is 130 mm × 130 mm ×
After producing a rectangular cylindrical housing part 2 with a top plate of 100 mm (depth), the upper surface of the housing part 2 is set to 150 mm below the H steel beam 4 in the space 10 above the ceiling in the same manner as in Example 1. After fixing at a position, a 125φ embedded lighting device (“Downlight Sg type” manufactured by Sekisui Chemical Co., Ltd.) was mounted inside the device to obtain a fireproof structure.

Example 3 A resin composition composed of metallocene polyethylene and vermiculite in the amounts shown in Table 1 was melt-kneaded with two rolls to obtain a 0.5 mm thick heat-expandable refractory sheet. A 0.4 mm-thick stainless steel plate was laminated on one side of the heat-expandable refractory sheet to obtain a heat-expandable composite sheet. Separately, using an ordinary gypsum board with a thickness of 15 mm, as shown in FIG.
After preparing a square cylindrical housing part 2 with a top plate of × 130 mm × 100 mm (depth), the above-mentioned heat-expandable composite sheet 8 was attached to the outside thereof such that the heat-expandable refractory sheet 82 side was on the outside. . This housing part 2 was inserted and fixed below the ceiling material with the opening side down in the same manner as in Example 1, and then mounted with a recessed lighting device (“Downlight Sg type” manufactured by Sekisui Chemical Co., Ltd.). , A fireproof structure was obtained.

Example 4 A resin composition comprising the metallocene polyethylene, neutralized heat-expandable graphite and ammonium polyphosphate having the compounding amount shown in Table 1 was melt-kneaded with two rolls to obtain a resin composition having a thickness of 2 mm. Was obtained. A fireproof structure was obtained in the same manner as in Example 3, except that this heat-expandable fireproof sheet was used.

Comparative Example A fire-resistant structure was obtained in the same manner as in Example 1 except that a hot-dip galvanized steel sheet having a thickness of 0.3 mm was used instead of the heat-expandable composite sheet.

With respect to the heat-expandable fire-resistant sheet and fire-resistant structure of the above Examples and Comparative Examples, the following items were evaluated for performance.
The results are shown in Table 1. (1) Change in Thickness The thickness when the heat-expandable refractory sheet was irradiated with a heat of 50 kW / m ² for 30 minutes was measured, and the change in thickness before and after the irradiation of the calorie (thickness D ₁ after irradiation / thickness D ₀ before irradiation). Was calculated. (2) Fire resistance A fire resistance test was performed on the fire-resistant structure in accordance with JIS A 1304, and the surface temperature of the H-shaped steel beam after one hour was measured with a thermocouple. The temperature was measured at eight locations on the surface of the H-section steel, and the average value is shown in Table 1.

[0076]

[Table 1]

[0077]

The fire-resistant structure of a building according to the present invention has the above-described structure, and includes a steel frame structural member disposed in a space above a ceiling formed between a floor material on an upper floor and a ceiling material on a lower floor. In the fireproof structure coated with fireproof, sufficient fireproof performance can be ensured even if an embedded lighting fixture is attached below the ceiling material.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically illustrating a fireproof structure of a building according to a first embodiment.

FIG. 2 is a cross-sectional view schematically illustrating a fireproof structure of a building according to a second embodiment.

FIG. 3 is a cross-sectional view schematically illustrating a fireproof structure of a building according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Housing part 3 Floor material 4 Beam 5 Field edge receiver 6 Field edge 7 Ceiling material 8 Thermal expansion composite sheet 81 Thermal expansion refractory sheet 82 Metal plate 9 Wall material

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E001 DE01 EA05 FA13 FA14 FA15 GA24 GA27 GA28 GA42 HA03 HA04 HA07 HA21 HA32 HA33 HA34 HB02 HB03 HD11 HE01 HF12 JA17 LA04 LA16

Claims (6)

[Claims] 1. A space above the ceiling is formed from a fire-resistant floor material on the upper floor, a fire-resistant ceiling material on the lower floor, and a fire-resistant wall material, and the steel structural members disposed in the space above the ceiling are collectively fire-resistant. In the fireproof structure of the building to be covered, an embedded lighting fixture is attached to the fireproof ceiling material side, and the lighting fixture is surrounded by a heat-expandable composite sheet made of a laminate of a metal plate and a heat-expandable fireproof sheet. The fire-resistant structure of a building, characterized by the fact that 2. The embedded luminaire according to claim 1, wherein the heat-expandable composite sheet made of a laminate of a metal plate and a heat-expandable fire-resistant sheet is housed in a housing portion formed into a cylindrical shape with a top plate. The fire-resistant structure of a building according to claim 1, wherein 3. The heat-expandable refractory sheet according to claim 1, wherein the heat-expandable refractory sheet is 50 kW / m
The thickness change (thickness after irradiation D ₁ / thickness before irradiation D ₀ ) when irradiating the calorific value of ( ² ) for 30 minutes is 1.1 to 30 (times). Building fireproof structure. 4. The fire-resistant structure for a building according to claim 1, wherein the heat-expandable refractory sheet is formed from a resin composition containing a heat-expandable inorganic substance. . 5. The heat-expandable refractory sheet according to claim 1, wherein the heat-expandable refractory sheet comprises a resin composition (I) containing a thermoplastic resin and / or a rubber substance. Fireproof structure of the building. 6. The fire-resistant structure for a building according to claim 1, wherein the heat-expandable fire-resistant sheet is made of a resin composition (II) containing an epoxy resin.