JP2003293482A - Fireproofing structure and construction method for fireproofing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide fireproofing structure of excellent workability, suppressing the occurrence and progress of smoke. <P>SOLUTION: The periphery of a wooden column member 3 is covered with a thermally expansive fireproofing material 2 to constitute a fireproof column member 1. The wooden column member 3 is formed of square wood of 30 cm×30 cm, and the fireproofing material 2 is thermally expansive with flexibility and has a thickness of about 3 mm or about 1.5 mm. The fireproofing material 2 contains a phosphorus compound, thermally expansive graphite, and an inorganic filler in a resin component mainly containing epoxy resin. A joint part 7 which is the butting part of the fireproofing materials 2, 2 is fastened with fasteners 6 such as tackers. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof coating structure for a wooden structure having good fireproof performance.

[0002]

2. Description of the Related Art Conventionally, in designing a fireproof structure for a wooden building such as a house, the so-called "burning" is called "if the cross-section of the wooden structure material has a certain degree, the core layer does not burn due to the heat insulation effect due to carbonization". It is known to have a design that includes a "dai".

[0003]

Even a wooden building constructed by such a conventional cross-sectional area design adding a "burning allowance" and a double structure design in which the surface of the structure is further covered with wood. In addition to the fire of the main body of the wooden building, the most serious problem in the spread of fire in a forest fire or the like is that a phenomenon of so-called "smoldering" may occur when carbonization proceeds.

It is known that even if a design is made in consideration of the above "burning allowance", carbonization of wood will proceed unless the smoldering is eliminated, and the buckling resistance of the wood will surely be lowered.

[0005] For example, in order to satisfy the performance equivalent to that of an ordinary fireproof building, there is a method in which a non-combustible material such as gypsum board or calcium silicate board is overlaid, but it has a very complicated structure. It was difficult to say that the workability was good.

Moreover, the gypsum board and the calcium silicate board have a problem that dust is generated when they are cut into a desired size and the working environment is deteriorated.

Further, in these coating materials, due to heat,
The clothing material itself warps and contracts, and the joints of the covering material open.

When flame or smoke enters through such an opening of the joint and the inflow of oxygen continues, even if the flame is stopped, it continues to smolder and carbonization of the wood structural material proceeds.

Therefore, the present invention has been made in view of such conventional problems, and an object thereof is to provide a fireproof coating structure which has good workability and can suppress the occurrence and progress of smoldering. To do.

[0010]

In order to achieve the above object, the invention according to claim 1 is such that a heat-expandable fireproof coating material is coated on the periphery of the surface side of a wooden structure body, and a fireproof coating is applied. It features a fireproof coating structure that protects joints, which are the butted parts of the material.

According to the first aspect of the present invention configured as above, when the temperature around the structure body rises, the heat-expandable fireproof coating material coated around the surface side of the structure body,
When expanded, the joints, which are the butted portions of these refractory coating materials, are closed.

Therefore, it becomes difficult for smoke and flame to reach the wooden structure body, and the risk that the wooden structure body is smoked is reduced.

According to a second aspect of the present invention, there is provided the fireproof coating structure according to the first aspect, wherein when the plurality of layers of the fireproof coating material are laminated, the joints in the laminating direction are staggered. It has a feature.

According to the second aspect of the present invention configured as described above, since the joints in the stacking direction are staggered with each other, smoke and flame further reach the main body of the wooden structure. It becomes difficult, and the risk that the wooden pillar material is smoked is reduced.

According to the third aspect,
The fireproof coating material is a thermoplastic resin or an epoxy resin 10.
A resin composition containing 0 parts by weight, 20 to 350 parts by weight of the thermally expandable layered inorganic material and 50 to 400 parts by weight of the inorganic filler, and the total amount of the thermally expandable inorganic material and the inorganic filler is 200 to 600 parts by weight. The refractory coating structure according to claim 1 or 2, wherein the refractory coating structure is formed by being expanded by heating and is expanded by heating.

According to the third aspect of the present invention configured as above, since the expanded fireproof heat insulating layer contains a thermoplastic resin or an epoxy resin, a carbonized layer is formed by heating and a crosslinked structure is formed. Since it is removed, the shape retention after thermal expansion is good.

The fireproof coating according to any one of claims 1 to 3, wherein the fireproof coating is covered with a net or a sheet made of an incombustible fiber material. It features a structure.

According to the present invention having the above-mentioned structure, since the refractory covering material is covered with a net or a sheet made of a noncombustible fiber material, the shape retention property after thermal expansion is good. At the same time, even if the thickness of the fireproof coating material is increased, it is possible to prevent the fireproof coating material from falling off.

Further, according to the fifth aspect of the present invention, the refractory coating material is impregnated into a net or mat made of non-combustible fiber material, and / or a base material layer is provided on one side or both sides of the refractory coating material. It is characterized by the fireproof coating structure according to any one of claims 1 to 4.

According to a fifth aspect of the present invention, the fire-resistant coating material is impregnated in a net or mat made of non-combustible fiber material, and / or a base material layer is provided on one or both sides of the fire-resistant coating material. Since it is provided, it is possible to further improve the residue retention force of the refractory coating material after expansion due to temperature rise.

According to a sixth aspect of the present invention, the fireproof coating material or the joint portion is fixed by at least one of an adhesive and a stopper. It is characterized by the construction method of the fireproof coating structure described in the item.

According to a sixth aspect of the present invention configured in this way, the fire-resistant coating material is cut into a desired shape so that the fire-resistant coating material or the joint portion is made of an adhesive or a stopper. Since it is fixed by at least one of them, the construction is easy.

When the refractory coating material is cut into a desired shape, there is no possibility of dust generation unlike the conventionally used gypsum board or calcium silicate board. For this reason,
The working environment can be improved.

Further, the invention according to claim 7 is characterized by a fire-resistant coating structure in which a heat-expandable fire-resistant coating material is cast by casting over substantially the entire circumference of the main body of a wooden structural material. I am trying.

According to the seventh aspect of the present invention having the above-mentioned structure, the heat-expandable fireproof coating material is cast around the main body of the wooden structural material, and the main body of the structural material is substantially all around. It is covered by migration.

In this way, since the periphery of the structural material main body is covered with the fireproof coating material over substantially the entire circumference, joints are not formed, and smoke and flame hardly reach the wooden structural main body. Therefore, the risk of the wood-based structure body being smoked is reduced.

Further, according to the eighth aspect of the present invention, the thermally expansive refractory coating material is cast over the entire circumference of the main body of the wooden structural material by casting to cover it. It features a construction method of fireproof coating structure.

According to the present invention having the above-mentioned structure, since the structural material coated with the fireproof material in advance can be mass-produced, the manufacturing cost can be reduced, and the construction work process at the time of building construction. Therefore, the fireproof coating process can be reduced and the workability can be improved.

[0029]

First Embodiment Next, a first embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a fireproof coating structure according to the first embodiment of the present invention. It should be noted that the same or equivalent parts as those of the conventional example will be described with the same reference numerals.

First, the construction will be described. In the fireproof coating structure according to the first embodiment, this is an example of construction of a wooden structural member, and a thermally expansive fireproof structure is provided around the wooden pillar 3 as the structure body. The fireproof pillar materials 1 and 11 are formed by coating the covering material 2.

The wooden pillar 3 is made of wood of 30 cm × 30 cm square, and the fireproof coating 2 has a thickness of about 3 m.
m or about 1.5 mm, it is flexible and has thermal expansion properties.

The refractory coating material 2 contains a phosphorus compound, thermally expandable graphite, and an inorganic filler in a resin component containing an epoxy resin.

The refractory coating material 2 is a bisphenol F type (made by Yuka Shell Co., Ltd.) as an epoxy monomer.
As a curing agent, a diamine-based curing agent (made by Yuka Shell Co., Ltd.)
Ammonium polyphosphate (AP422, manufactured by Hoechst) is used as the phosphorus compound, CA60S (manufactured by Nippon Kasei) is used as the neutralized thermally expandable graphite, and water is used as the inorganic filler. Aluminum oxide (B7
03S, manufactured by Nippon Light Metal Co., Ltd., and calcium carbonate (trade name: Whiten BF-300, manufactured by Bihoku Kouka Co., Ltd.) were used.

The respective contents of the fire-resistant resin composition comprising the resin component containing the epoxy resin (epoxy monomer and curing agent), phosphorus compound, neutralized thermally expansive graphite, and inorganic filler are as described above. Each component was kneaded using a roll at a mixing ratio of 100 parts by weight of a resin component, 100 parts by weight of a phosphorus compound, 100 parts by weight of neutralized heat-expandable graphite, and 100 parts by weight of an inorganic filler. Then, a monomer mixture was obtained.

These heat-expandable refractory materials can be expanded by heating to form a fire-resistant heat insulating layer, and have a heat resistance of 50 kW.
There is no particular limitation as long as the deposition expansion coefficient after heating for 30 minutes under a heating condition of 1 / square meter is 3 to 100 times, but the following thermoplastic resin or epoxy resin is used as an inorganic filler and thermal expansion property. A resin composition containing a layered inorganic material which is an inorganic compound is preferable.

Examples of the thermoplastic resin include polypropylene resins, polyethylene resins, poly (1-) butene resins, polyolefin resins such as polypentene resins, polystyrene resins, acrylonitrile-butadiene-styrene (ABS) resins. Resin, polycarbonate resin, polyphenylene ether resin, acrylic resin,
Polyamide resin, polyvinyl chloride resin, phenol resin, polyurethane resin, polybutene, polyisobutylene, natural rubber, isoprene rubber, butadiene rubber,
1.2-polybutadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, chlorinated butyl rubber, ethylene-propylene rubber, chlorosulfonated polyethylene, acrylic rubber, epichlorohydrin rubber, polyvulcanized rubber, silicone rubber, fluorine rubber, Urethane rubber etc. are mentioned.

These thermoplastic resins and / or rubber substances may be used alone or in combination of two or more kinds. A blend of two or more resins may be used as the base resin in order to adjust the melt viscosity, flexibility, adhesiveness, etc. of the resin.

Among the above-mentioned thermoplastic resins and / or rubber substances, halogenated ones themselves have high flame retardancy, and crosslinking is caused by the dehalogenation reaction by heat.
It is preferable in that the strength of the residue after heating is improved.

Among these resins, those which are flexible and have rubber-like properties are preferable, and the inorganic filler can be highly filled, and the obtained resin composition is soft and flexible. Become. To obtain a softer and more flexible resin composition, non-vulcanized rubber or polyethylene resin is preferably used.

Examples of the polyethylene resin include ethylene homopolymers, copolymers of ethylene as a main component with ethylene and other α-olefins, and ethylene and α.
-Copolymers with monomers other than olefins and mixtures of these (co) polymers.

Ethylene containing ethylene as a main component and other α
Examples of the α-olefin in the copolymer with —olefin include 1-hexene, 4-methyl-1-pentene, 1-octene, 1-butene, 1-pentene and the like. Examples of copolymers of ethylene and monomers other than α-olefins include ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers, ethylene-methacrylate copolymers, and the like.

As the ethylene homopolymer or the copolymer of ethylene and other α-olefin, Ziegler
Examples of the polymer include a Natta catalyst, a vanadium catalyst, and a metallocene compound containing a tetravalent transition metal as a polymerization catalyst. Among them, a polyethylene resin obtained by using a metallocene compound containing a tetravalent transition metal as a catalyst is a resin. preferable.

The thermoplastic resin and / or rubber substance may be further crosslinked or modified within a range not impairing the fire resistance performance of the heat-expandable refractory layer of the present invention. The timing of cross-linking or modifying the rubber substance is not particularly limited, and a thermoplastic resin and / or a rubber substance previously cross-linked and modified may be used, and other components such as a phosphorus compound or an inorganic filler described later may be used. Crosslinking and modification may be carried out at the same time when blending. In addition, thermoplastic resin and /
Alternatively, the rubber substance may be cross-linked or modified after blending other components, and the cross-linking or modification may be performed at any stage.

The above-mentioned cross-linking method is not particularly limited, and the cross-linking method usually used for thermoplastic resins and / or rubber substances, for example, cross-linking method using various cross-linking agents, peroxides, etc., cross-linking by electron beam irradiation. There is a method.

The epoxy resin of the first embodiment is not particularly limited, but it is basically a resin obtained by reacting a monomer having an epoxy group with a curing agent.

As the monomer having an epoxy group, for example, a bifunctional glycidyl ether type, such as a polyethylene glycol type, a polypropylene glycol type, a neopentyl glycol type, a 1.6-hexanediol type, a trimethylolpropane type, or a poropylene oxide is used. Examples thereof include bisphenol A and hydrogenated bisphenol A type monomers.

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

Further, as the polyfunctional glycidyl ether type, phenol novolac type, orthocresol type, D
PP novolac type, dicyclopentadiene. Examples include monomers such as phenol type.

These may be used alone or in admixture of two or more.

As the curing agent, polyaddition type and catalyst type are used. Among them, polyamines, acid anhydrides, polyphenols, polymercaptans and the like can be mentioned as the polyaddition type. Examples of the catalyst type include tertiary amine, imidazoles, Lewis acid complex and the like.

The method for curing these epoxy resins is not particularly limited, and known methods can be used.

The heat-expandable refractory material composed of the resin composition containing the epoxy resin and the heat-expandable inorganic compound is excellent in shape retention because the heat-expandable refractory material after expansion comes to have a reinforcing structure. The thickness of the material can be reduced,
It is suitable for use on the surface of the wooden pillar 3.

The inorganic filler is not particularly limited, but for example, silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, Magnesium hydroxide, aluminum hydroxide,
Basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dawsonite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, potassium salts such as calcium silicate, talc, clay, mica, montmorillonite, bentonite, Activated clay, ceviolite, imogolite, sericite, glass fiber, glass beads, silica balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metal powders, potassium titanate , Magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide,
Examples thereof include silicon carbide, stainless fiber, zinc borate, various magnetic powders, slag fiber, fly ash, and inorganic phosphide compounds.

These may be used alone or in admixture of two or more.

Among these, in particular, it plays a role of an aggregate and contributes to the improvement of the strength of the expanded heat insulating layer produced after heating and the increase of the heat capacity.

Therefore, a metal carbonate represented by calcium carbonate or zinc carbonate, a water-containing inorganic substance represented by aluminum hydroxide or magnesium hydroxide, which has an endothermic effect upon heating in addition to its role as an aggregate, is preferable. Preference is given to metals, alkaline earth metals and metal carbonates of the periodic table IIb or mixtures of these with the aforementioned hydrated inorganic substances.

The inorganic phosphorus compound is used to improve the flame retardancy. The inorganic phosphorus compound is not particularly limited and includes, for example, red phosphorus; sodium phosphate, potassium phosphate, magnesium phosphate, and other metal phosphate salts;
Examples thereof include ammonium polyphosphates.

Among them, ammonium polyphosphates are preferable in terms of performance, safety, cost and the like.

The layered inorganic substance which is a thermally expandable inorganic compound that expands when heated is not particularly limited, but for example, vermiculite, kaolin, mica and thermally expandable graphite are preferable.

The thermally expansive graphite is a conventionally known substance, and powders of natural scaly graphite, pyrolytic graphite, quiche graphite and the like are mixed with inorganic acids such as concentrated sulfuric acid, nitric acid and selenic acid, and concentrated nitric acid and perchlorine. A graphite intercalation compound is produced by treating with a strong oxidizer such as acid, perchlorate, permanganate, dichromate, dichromate, hydrogen peroxide, etc. It is a crystalline compound that is maintained.

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

Examples of the above aliphatic lower amine include, for example,
Examples thereof include monomethylamine, dimethylamine, trimethylamine, ethylamine, propylamine and butylamine.

Examples of the alkali metal compounds and alkaline earth metal compounds include hydroxides, oxides, carbonates, sulfates, organic acid salts and the like of potassium, sodium, calcium, barium, magnesium and the like.

The particle size of the thermally expandable zinc is preferably 20 to 200 mesh. If the particle size is smaller than 200 mesh, the degree of expansion of graphite is small and a sufficient refractory heat insulating layer cannot be obtained, and if the particle size is larger than 20 mesh, the degree of expansion of graphite is large, but the thermoplastic resin Alternatively, when kneading with an epoxy resin, the dispersibility deteriorates, and the deterioration of physical properties is unavoidable.

Commercially available products of the above-mentioned neutralized thermally expandable graphite are, for example, "GRA" manufactured by UCAR CARBON.
FGUARD # 160 "," GRAFGUARD # 22
0 "," GREP-EG "manufactured by Tosoh Corporation, and the like.

The blending amount of the inorganic filler and the layered inorganic material in the resin composition is 5 to 400 parts by weight, more preferably 100 parts by weight of the thermoplastic resin or epoxy resin. It is 100 to 200 parts by weight.
At least at least 2 layered inorganic substances that expand when heated
0 to 150 parts by weight.

If the amount of the inorganic filler is less than 50 parts by weight, the residual volume after combustion decreases, so that a sufficient refractory heat insulating layer cannot be obtained.

Further, since the ratio of combustible substances increases, the flame retardancy decreases.

On the other hand, when the amount of the inorganic filler exceeds 400 parts by weight, the compounding ratio of the resin binder decreases, so that the cohesive force is insufficient and it is difficult to obtain strength as a molded product.

When the amount of the layered inorganic material is less than 20 parts by weight, the expansion ratio is insufficient and sufficient fire resistance and fire prevention performance cannot be obtained.

On the other hand, when the amount of the layered inorganic substance exceeds 150 parts by weight, the pseudo-collecting force is insufficient, so that the strength as a molded product cannot be obtained.

Further, the above resin composition may contain a phenol-based, amine-based, sulfur-based, etc. antioxidant as well as a metal damage inhibitor, as long as the physical properties of the resin product are not impaired. Antistatic agent, stabilizer, cross-linking agent, lubricant, softener,
Additives such as pigments and tackifying resins, tackifiers such as polybutene and petroleum resins can be added.

As the flame retardant, a phosphorus compound is preferable from the viewpoint of generating toxic gas at the time of fire, for example, red phosphorus;
Various phosphoric acid esters such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate; metal phosphates such as sodium phosphate, potassium phosphate, magnesium phosphate; polyphosphoric acid Ammonium acid compounds; compounds represented by Chemical Formula 1 and the like can be mentioned. These phosphorus compounds may be used alone or in combination of two or more. Among these, from the viewpoint of fire resistance, red phosphorus, the compound represented by the chemical formula 1, and ammonium polyphosphates are preferable, and ammonium polyphosphates are more preferable in terms of performance, safety, cost and the like.

[0075]

[Chemical 1] In the above chemical formula 1, Rl and R3 are hydrogen and C1-16.
A linear or branched alkyl group of 6 or 6 carbon atoms
Represents the aryl group of 16; R2 is a hydroxyl group, carbon number 1
~ 16 linear or branched alkyl group, having 1 carbon atom
To a linear or branched alkoxyl group having from 16 to 16 carbon atoms, an aryl group having from 6 to 16 carbon atoms, or an aryloxy group having from 6 to 16 carbon atoms.

Examples of the compound represented by the chemical formula 1 include methylphosphonic acid, dimethyl methylphosphonate, diethyl methylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methylpropylphosphonic acid and t-butylphosphonic acid. , 2,3-dimethyl-
Butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphinic acid, dioctylphosphinic acid, phenylphosphinic acid, diethylphenylphosphinic acid, diphenylphosphinic acid , Bis (4-methoxyphenyl) phosphinic acid and the like. Among them, t-butylphosphonic acid is preferable in terms of high flame retardancy, although it is expensive.

The ammonium polyphosphates are not particularly limited, and examples thereof include ammonium polyphosphate, melamine-modified ammonium polyphosphate, and the like. From the viewpoints of flame retardancy, safety, cost, handleability, etc., ammonium polyphosphate is used. Is preferably used. Examples of commercially available products include "EXOLIT AP422" and "EXOLIT AP462" manufactured by Clariant, "Sumisafe P" manufactured by Sumitomo Chemical Co., Ltd., and "Terra Rouge C7" manufactured by Chisso.
0 ”,“ Terra Rouge C80 ”and the like.

It is considered that the phosphorus compound reacts with a metal carbonate such as calcium carbonate or zinc carbonate to promote the expansion of the metal carbonate. Particularly, when ammonium polyphosphate is used as the phosphorus compound, it is high. A swelling effect is obtained. It also acts as an effective aggregate and forms a residue with high shape retention after burning.

In general, since the inorganic filler acts as an aggregate, it is considered that it greatly contributes to the improvement of the strength of the combustion residue and the increase of the heat capacity.

The particle size of the inorganic filler is from 0.5 to
200 μm is preferable, and more preferably 1 to 50 μm.
Is.

When the added amount of the inorganic filler is small, the dispersibility greatly affects the performance, and therefore the one having a small particle size is preferable, but when the particle size is less than 0.5 μm, secondary aggregation occurs,
Dispersibility deteriorates.

When the amount of the inorganic filler added is large,
As the high filling progresses, the viscosity of the resin composition increases and the moldability decreases, but since the viscosity of the resin composition can be decreased by increasing the particle size, the particle size in the above range is large. Those are preferable. However, if the particle size exceeds 200 μm, the surface properties of the molded product and the mechanical properties of the resin composition deteriorate.

Among the above-mentioned inorganic fillers, metal carbonates such as calcium carbonate and zinc carbonate which particularly play an aggregate role; aluminum hydroxide and magnesium hydroxide which have an endothermic effect upon heating in addition to an aggregate role. The water-containing inorganic substance is preferred.

When the water-containing inorganic substance and the metal carbonate are used in combination,
It is considered to contribute greatly to the improvement of the strength of combustion residues and the increase of heat capacity.

Among the above-mentioned inorganic fillers, water-containing inorganic substances such as aluminum hydroxide and magnesium hydroxide are endothermic due to water produced by the dehydration reaction during heating,
High temperature resistance due to reduced temperature rise, and
Oxide remains as a combustion residue, and this serves as an aggregate, which is preferable in that the strength of the combustion residue is improved.

Further, since magnesium hydroxide and aluminum hydroxide have different temperature ranges in which the dehydration effect is exerted,
When used together, the temperature range in which the dehydration effect is exerted is widened, and a more effective temperature rise suppressing effect is obtained, so that the use in combination is preferable.

If the particle size of the above-mentioned hydrated inorganic substance becomes small, the bulk becomes large and it becomes difficult to make it highly packed. Therefore, in order to enhance the dehydration effect, a large particle size is preferable.

Specifically, when the particle size is 18 μm, 1.5
It is known that the filling limit amount is improved by about 1.5 times as compared with the particle size of μm. Further, by combining a particle having a large particle diameter and a particle having a small particle diameter, higher packing can be achieved.

Commercially available products of the above-mentioned hydrous inorganic material include, for example, as aluminum hydroxide, "trade name: Heidilite H-42M" (manufactured by Showa Denko KK) having a particle size of 1 µm, and "trade name: Heidi having a particle size of 18 µm. Light H-31 "(manufactured by Showa Denko KK) and the like.

As a commercial product of the above-mentioned calcium carbonate, for example, "Product name: Whiten SB Red" having a particle size of 1.8 μm is used.
(Product of Shiraishi Calcium Co., Ltd.) with a particle diameter of 8 μm
300 "(manufactured by Bihoku Kouka Co., Ltd.) and the like. Higher packing can be achieved by combining those having a large particle diameter and those having a small particle diameter.

When the compounding amount of the heat-expandable layered inorganic material in the resin composition is small, the expansion ratio after combustion is insufficient and sufficient fire resistance and fireproof performance cannot be obtained. When the compounding amount is large, the mechanical properties are largely deteriorated. Since it cannot be used, 20 to 350 parts by weight is preferable with respect to 100 parts by weight of the resin content.

When the compounding amount of the inorganic filler in the resin composition is small, the amount of residue after combustion is insufficient and sufficient fire resistance cannot be obtained, and in addition, the ratio of combustibles is increased so that the flame retardancy is increased. If the amount of the resin component is decreased, the mechanical properties are significantly deteriorated and it becomes unusable for use. Therefore, it is preferably 50 to 400 parts by weight with respect to 100 parts by weight of the resin content.

When the total amount of the heat-expandable layered inorganic material and the inorganic filler in the resin composition is small, the amount of residue after combustion is insufficient and sufficient fire resistance cannot be obtained, and when the total amount is large, the mechanical properties are deteriorated. Since it becomes large and cannot be used, 200 to 600 parts by weight is preferable for 100 parts by weight of the resin content.

When the resin component is a thermoplastic resin,
Extruder, Banbury mixer,
The resin composition can be obtained by supplying to a known kneading device such as a kneader mixer and melt-kneading.

The obtained resin composition can be molded into a sheet by a conventionally known molding method such as press molding, extrusion molding, calender molding or the like to obtain a sheet-shaped thermally expandable material.

When the resin component is an epoxy resin,
A sheet-shaped heat-expandable material can be obtained, for example, by applying the components of the resin composition to a metal plate and then heating and curing the components.

The above-mentioned resin composition contains a phenol-based, amine-based, sulfur-based, etc. antioxidant, a metal damage inhibitor, an antistatic agent, a stabilizer, a cross-linking agent, and a lubricant as long as the physical properties thereof are not impaired. , Softeners, pigments and the like may be added.

The net or sheet made of non-combustible fibrous material used in the present invention is preferably made of inorganic fiber or metal fibrous material. For example, woven cloth of glass fiber (glass cloth, continuous strand mat, etc.). ) Or non-woven fabric (chopped strand mat, etc.), ceramic fiber woven fabric (ceramic cloth, etc.) or non-woven fabric (ceramic mat, etc.), carbon fiber woven or non-woven fabric, net or sheet formed from lath or wire mesh is preferably used. To be

The net or mat made of the non-combustible fibrous material has a weight of 25 to 200 per square meter.
It is 0 g. If the weight per square meter is less than 25 g, the effect of improving the shape retention of the expanded heat insulating layer is lowered, and if it exceeds 2000 g, it becomes difficult to insert the epoxy heat-insulating layer into the epoxy resin composition.

The net or sheet made of the non-combustible fibrous material preferably has a thickness of 4 mm or less. 4mm thick
When it exceeds, it becomes difficult to deform such as bending when constructing the fireproof sheet.

In the case of the net made of the non-combustible fibrous material, the opening is preferably 0.1 to 50 mm. When the opening is less than 0.1 mm, it becomes difficult to impregnate the epoxy resin into the resin, and when it exceeds 50 mm, the effect of improving the shape retention of the expansion heat insulating layer becomes low.

When the thickness of the net or sheet made of the non-combustible fibrous material is smaller than the thickness of the refractory sheet, the position of the net or sheet may be any position in the thickness direction of the refractory sheet, It is preferably the exposed surface side.

The refractory sheet is formed by integrally molding a composition composed of a previously prepared epoxy resin, neutralized heat-expandable graphite and an inorganic filler with a net or sheet composed of a non-combustible fibrous material. Is obtained by

As a method for producing the refractory sheet, a kneaded product of an epoxy resin composition is prepared in advance, and at the stage of forming the resin composition into a sheet, it is integrated with a net or mat made of a noncombustible fibrous material. A molding method may be mentioned.

The kneaded product of the resin composition of the refractory sheet is
The above components can be obtained by kneading using a known device such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneader mixer, a kneading roll, a grinder, and a planetary stirrer.

It is also possible to separately knead the filler with the epoxy group-containing monomer and the curing agent, and knead them with a static mixer, a dynamic mixer or the like immediately before forming the sheet.

As the above-mentioned molding method, for example, when the above-mentioned epoxy resin kneaded material is formed into a sheet by press molding, roll molding, coater molding, etc., after impregnating a net or mat made of a noncombustible fiber material into the epoxy resin, The method of hardening an epoxy resin is mentioned.

The method for curing the epoxy resin is not particularly limited, and known methods such as heating with a press or roll and heating with a heating furnace can be used.

On one or both sides of the heat-expandable refractory material, the base material layer 4 is provided for the purpose of improving workability and strength of combustion residue.
May be laminated.

As the material used for the base material layer 4,
Examples thereof include cloth, non-woven fabric, kraft paper, plastic film, split cloth, glass cloth, aluminum glass cloth, aluminum foil, aluminum vapor-deposited film, aluminum kraft paper, and laminates of these materials. Preferred are plastic films such as polyethylene film, polypropylene film and polyester film, or aluminum kraft paper and aluminum glass cloth. The thickness of the base material layer 4 is preferably 0.25 mm or less.

When the heat-expandable refractory material is used for fireproofing, the heat-expandable fireproof material is adhered with an adhesive or the like so as to be along the periphery of various woods, or a metal fastener such as a screw or a tacker. It is preferable to form the refractory pillar materials 1 and 11 by fixing at 6 or by using them together.

When fixing using screws, it is preferable to use a washer in combination.

When fixing with a tucker,
As the carbonization of the wooden pillar 3 progresses, the fixing force on the wooden pillar of the tucker is weakened. Therefore, it is desirable to use one having a long needle or to fix it by staggering.

In the case of the refractory sheet impregnated with the lath or the wire net, a method may be used in which the lath or the wire net is exposed at the end and the metal parts are fixed together.

When the sheet made of the resin composition is coated, the joints may be mutually covered so as to complement the joint portion between the sheets, and a multi-layer coating may be performed.

For example, in the case of a rectangular structure, a lower layer is covered on four sides with a flat sheet, and then an upper layer is covered with an L-shaped sheet, or two types of L-shaped sheets having different sizes are used. There is a structure in which the joints are covered in the upper and lower layers so that the joints become mutually.

Further, even if the structure has a circular cross section, there is a structure in which a sheet molded according to the curve is covered so that the joints in the upper layer and the lower layer are joints.

After covering the wooden structure with the heat-expandable refractory material by the above-mentioned method, as shown in FIG. 1 or 2, in order to further protect the joint portion 7, for example, the joint portion 7 of the sheet is used. A net or sheet 5 made of non-combustible fibrous material, made of inorganic fiber or metal fibrous material, for example, woven glass fiber (glass cloth, continuous strand mat, etc.) or non-woven fabric (chopped strand mat, etc.) , Ceramic fiber woven cloth (ceramic cloth etc.) or non-woven cloth (ceramic mat etc.), carbon fiber woven cloth or non-woven cloth, net or sheet formed from lath or wire mesh, metal fasteners or adhesives such as tuckers It is desirable to protect and fix them together.

When protecting the joints, a method of protecting the joints between the fire-resistant composite materials 2 and 2 that are adjacently attached by covering the joints,
There is a method of covering the entire circumference of the structural material main body 3 covered with the fireproof coating material 2.

After the heat-expandable refractory material made of the resin composition is applied to the periphery of the structural material body 3 by casting, the material is made of glass cloth or the like so as to cover the entire circumference. You may attach and install a net or the sheet 5.

A known adhesive can be used as the adhesive. For example, vinyl acetate resin-based, acrylic resin-based, rubber-based, epoxy resin-based, synthetic rubber-based, α-cyanoacrylate-based adhesives, etc. are possible. It is preferable as an adhesive that is used well because it has good compatibility with the heat-expandable refractory material and non-combustible fiber material used for wood.

Next, the operation of the first embodiment will be described.

The present invention fundamentally eliminates smoldering, which is the weakest point of wood, and realizes a fire resistant structure of a wooden building. Furthermore, as a method of protecting the covering material and joints thereof, it has excellent fire resistance and is lightweight. It is intended to provide a fireproof coating structure having a thin thickness, excellent in workability and productivity, and having high cost performance, and a construction method thereof, and to realize a wooden fireproof building by the fireproof coating structure and the construction method.

That is, conventionally, generally, a method in which a foamed refractory material is laminated on a metal supporting sheet, the supporting sheet side is provided so as to face wood, and a seam is overlapped and fixed by a fastener, or by butting A method is known in which the joint portion is closed by pressing the same foamed refractory material while heating it.

However, in such a method, since the metal support sheet faces the wood, a contraction of the wood due to heating or a thinning of the wood due to progress of carbonization causes a gap between the support sheet and the wooden structure, There is a problem that flame and oxygen inflow occur.

Further, the method of overlapping the seams creates a step on the surface, which becomes an obstacle when applying a finishing material or the like.

Further, the method of butt-closing the joint portion while heating the same foamed refractory material is not good in workability, and it is difficult to secure a certain quality. Can be said.

In addition, there is a method of applying or impregnating an inorganic flame-retardant liquid agent (fireproof paint, fireproof paint), but this is effective in fireproofing although it is difficult to burn when exposed to heat. 10 as structure
It is extremely difficult to impart performance that can withstand high temperatures near 00 ° C.

Further, when the structure is coated with the heat-expandable fireproof coating material, if the joint portion is not protected, cracks or openings occur in the joint portion when the coating material expands when heated. However, there is also a problem that flame and oxygen inflow occur from there and carbonization progresses when exposed to high temperature for a long time, and it continues to smolder for a long time even if heating is stopped and the structural proof strength is significantly reduced. .

The present invention has been made in order to solve the problems assumed in the above-mentioned prior art, and its purpose is to have good workability in fireproof coating construction and a good construction work environment. In addition, it is to provide a fireproof coating structure capable of suppressing the generation and progress of smoldering, which is the weakest point of wood, and a construction method therefor, and further to provide a fireproof wooden building having feasibility.

That is, when the temperature around the pillar 1 rises, the heat-expandable fireproof coverings 2 and 2 coated on the periphery of the front side of the wooden pillar 3 expand to expand the fireproof covering 2 ，
The joint portion 7 stopped by the fasteners 5, which are the butted portions of 2, is closed.

Therefore, it becomes difficult for smoke and flame to reach the wooden pillar 3 which is the main body of the wooden structure, and the possibility that the wooden pillar 3 is smoked is reduced.

At this time, the resin used for the fireproof coating material 2 forms a carbonized layer to contribute as an expansion heat insulating layer, and since it has a crosslinked structure, it has excellent shape retention after thermal expansion.

Further, the inorganic filler has a function of increasing the heat capacity during heating.

The net or mat made of non-combustible fibrous material contributes to the improvement of the shape retention of the expanded heat insulating layer,
Even when the thickness of the expansion heat insulating layer is increased, the expansion heat insulating layer is prevented from falling off.

Further, the phosphorus compound used in the refractory sheet further improves the retention of formation of the expanded heat insulating layer.

The method for protecting joints of the present invention not only contributes to the shape retention after thermal expansion and prevention of opening and cracking of joints by using the above-mentioned heat-expandable refractory material, but also Since the construction method is simple and uniform, not only fire resistance but also workability, quality retention, and cost performance are excellent.

In addition, it is possible to fundamentally eliminate joints by a construction method in which the fire-resistant coating material 2 is directly coated on the wooden structure by casting before the compound is hardened.
Mass production is possible as a wood fireproof material that has been fireproof coated in advance.

Therefore, the fireproof coating after assembling each structural member is reduced, and the work environment and workability of the fireproof coating are further improved.

A net or a mat made of a non-combustible fiber material is impregnated in the heat-expandable refractory material, and / or the base material layer 4 is laminated on one or both sides of the heat-expandable fire resistant material.
The residue retention after expansion is further improved, and the effects of heat insulation and fire resistance are further improved.

Even if the base material layer 4 is melted at a temperature that would normally melt by itself, the shape of the base material layer 4 in the residue or on the surface is not melted by being impregnated or laminated with a heat-expandable refractory material. It has the property of holding, and can further improve the residue holding power after expansion, and has the effect of further improving the heat insulation performance and fire resistance performance.

Since the expanded refractory heat insulating layer contains the thermoplastic resin or the epoxy resin, the carbonized layer is formed by the temperature rise, and since the crosslinked structure is formed, the shape retention property after the thermal expansion is good. Is.

Further, since the fireproof coating material is cut into a desired shape and the fireproof coating material or the joint portion is fixed by at least one of an adhesive and a stopper, the construction can be performed. It's easy.

When the refractory coating material is cut into a desired shape, there is no possibility of dust generation unlike the conventionally used gypsum board or calcium silicate board. For this reason,
The working environment can be improved.

Further, in the case where the thermally expansive fireproof coating material is attached to the periphery of the wooden structural material main body by casting and the structural material main body is coated over substantially the entire circumference, However, since it is covered with the fireproof coating material over substantially the entire circumference, joints are not formed, smoke and flame are hard to reach the wooden structure body, and the wooden structure body may be smoked. Is reduced.

Further, since it is possible to mass-produce the structural material that has been fireproof coated in advance, it is possible to reduce the manufacturing cost and to reduce the fireproof coating process from the construction work process at the time of building construction. It is possible to improve the property.

The following Examples 1 and 2 are examples of construction of wooden structural members, in which the fireproof coating material 2 is coated around the structural material.

The wooden pillar 3 as the structural material is 3
The fire-resistant coating material 2 is made of wood of 0 cm × 30 cm square.
The upper and lower refractory coating materials 2a and 2b are 3 mm and 1.5 mm in thickness, and have thermal expansion properties with flexibility and flexibility.

For the fireproof coating materials 2 and 2a, 2b, a resin component containing an epoxy resin, which contains a phosphorus compound, thermally expansive graphite, and an inorganic filler is used.

The fire-resistant coating material 2 uses bisphenol F type (manufactured by Yuka Shell Co., Ltd.) as an epoxy monomer, diamine-based curing agent (manufactured by Yuka Shell Co., Ltd.) as a curing agent, and polyphosphoric acid as a phosphorus compound. Ammonium (AP
422, manufactured by Hoechst Co., Ltd., CA60S (manufactured by Nippon Kasei Co., Ltd.) is used as the heat-expandable graphite which has been neutralized, and aluminum hydroxide (B703 is used as an inorganic filler.
S, manufactured by Nippon Light Metal Co., Ltd., and calcium carbonate (trade name: Whiten BF-300, manufactured by Bihoku Kouka Co., Ltd.) were used.

The content of each of the fire-resistant resin composition comprising the resin component containing the epoxy resin (epoxy monomer and curing agent), phosphorus compound, neutralized heat-expandable graphite, and inorganic filler is as described above. Each component was kneaded using a roll at a mixing ratio of 100 parts by weight of a resin component, 100 parts by weight of a phosphorus compound, 100 parts by weight of neutralized heat-expandable graphite, and 100 parts by weight of an inorganic filler. To obtain a monomer mixture.

[0152]

Example 1 In Example 1 shown in FIGS. 1 and 2, the monomer mixture and glass cloth as a non-combustible fiber material were impregnated by a roll coater, processed into a sheet having a thickness of 3 mm, and continuously heated at 120 ° C. It was cured to obtain a fireproof coating material 2.

The fireproof coating material 2 in sheet form is used as the wooden pillar material 3
Each side is cut to the size of each side, and it is pasted with an epoxy adhesive, and in the vicinity of the joint portion 7 which is the abutting portion of the fireproof coating materials 2 and 2 at the corners, the wooden pillar material is tacker 6 ... It was fixed at 3.

Further, as a protective treatment of the joint portion 7, the entire surface was covered with a glass cloth 5, and the overlapped portion was fixed with a tacker 6 to obtain a pillar material 1.

[0155]

Example 2 In Example 2 shown in FIGS. 3 and 4, the monomer mixture and glass cloth as a non-combustible fiber material were impregnated by a roll coater into a sheet having a thickness of 1.5 mm, and then an L-shaped mold was formed. By continuously heating and curing the same at 120 ° C., upper and lower refractory coating materials 2a and 2b were obtained.

The fireproof coating material 2a formed into this L shape,
2b are double-layered on the wooden pillar 3 with an epoxy adhesive so that the joints are mutually connected, and the tacker 6 is formed in the vicinity of the joints 7a, 7b which are the abutting portions of the fireproof coverings 2a, 2b. Then, it was fixed to the wooden pillar material 3 to obtain a pillar material 11.

By the 60-minute fire resistance test method according to ISO834, the pillar materials 1 and 11 and a comparative example. Experiments were carried out on a total of four types of pillar material 1 in which the joint portion 7 was not protected by glass cloth, and as another comparative example, wood which was not coated with fireproof coating.

[0158]

[Experimental Results] (1) Fire Resistance When the test piece was disassembled after the pillar material 1 was left standing for 180 minutes after heating for 60 minutes, there was almost no smoldering of the tree and there was almost no decrease in the cross-sectional area.

Similarly, with respect to the pillar material 11, 1
When the test piece was disassembled after being left for 80 minutes, the wood did not smolder, and the cross-sectional area was hardly reduced.

Further, when the pillar material 1 whose joints are not protected with glass cloth was left for 180 minutes after heating and then disassembled, the smoldering was resolved. Pillar material 1 and pillar material 11 protected by
The cross-sectional area was slightly reduced compared to.

Further, in the case of the wood without the fireproof coating, the wood continued to smolder even after standing for 180 minutes, and the wood after extinguishing the fire was substantially carbonized.

From the above, the column members 1 and 11 of Example 1.2 shown in the first embodiment of the present invention are effective against afterflame and smoldering, and have fire resistance and strength retention during a fire. It was confirmed that it is also effective in terms of points. (2) In the residual shape-retaining pillar material 1 of the fire-resistant coating material after expansion, the abutting portions of the corners of the fire-resistant coating material 2 are protected in such a manner that the glass cloth is buried in the residue, and the residue does not open or fall off. None, the shape was completely retained.

As described above, in the pillar material 1 of Example 1, since the fireproof coating material 2 is covered with the net or sheet 5 of the glass cloth made of noncombustible fiber material, the shape retention property after thermal expansion is improved. In addition to being good, even when the thickness of the fireproof coating material 2 is increased, it is possible to prevent the fireproof coating material 2 from falling off the wood pillar material 3.

Further, in the pillar material 11, the glass cloth impregnated in the fireproof coating material 2 is fixed by the tacker after the experiment, and there is almost no opening or dropping of the residue at the butted portion, and the adhesive and A residue of about 50 mm or more was retained on the entire surface of the pillar material by the tucker.

As described above, in the pillar material 11 of the second embodiment, the joints in the stacking direction are staggered, so that smoke and flame are less likely to reach the wooden pillar material 3. The risk of the pillar 11 being smoked is reduced.

On the other hand, in the pillar material 1, the joint portion 7 at the corner portion is used.
Regarding the test body which was not subjected to the protection treatment of No. 1, although the residue of about 20 mm or more was retained in the corner portion, the expansion pressure of the butted portion caused a part of the residue to open, resulting in the column member 1 and the column member having the glass cloth. Compared with No. 11, the fire resistance was slightly inferior.

[0167]

As described above, according to the invention as set forth in claim 1, when the temperature around the structure body rises, the heat-expandable fireproof coating around the surface side of the structure body is provided. The covering material expands to close the joints, which are the abutting portions of these refractory covering materials.

Therefore, it becomes difficult for smoke and flame to reach the wooden structure body, and the risk that the wooden structure body is smoked is reduced.

Further, according to the second aspect of the invention, since the joints in the stacking direction are configured to be staggered with each other, it becomes more difficult for smoke and flame to reach the main body of the wooden structure. The risk of the wood pillars being smoked is reduced.

Then, according to the third aspect,
Since the expanded fireproof heat insulating layer contains a thermoplastic resin or an epoxy resin, a carbonized layer is formed by heating, and a crosslinked structure is formed, so that the shape retention property after thermal expansion is good.

According to the fourth aspect of the invention, since the fireproof coating is covered with a net or sheet made of noncombustible fiber material, the shape retention after thermal expansion is good, and Even if the thickness of the fireproof coating material increases, it is possible to prevent the fireproof coating material from falling off.

Further, according to the fifth aspect, a net or a mat made of a non-combustible fiber material is impregnated with the fireproof coating material, and / or a base material layer is provided on one or both sides of the fireproof coating material. Therefore, the residue retention force of the refractory coating material after expansion due to the temperature rise can be further improved.

According to the sixth aspect of the present invention, the fireproof coating material is cut into a desired shape so that the fireproof coating material or the joint portion is made of at least one of an adhesive and a stopper. Since it is fixed by one side, construction is easy.

When the refractory coating material is cut into a desired shape, there is no risk of dust generation unlike the conventionally used gypsum board or calcium silicate board. For this reason,
The working environment can be improved.

Further, according to the seventh aspect, the thermally expansive refractory coating material is attached by casting to the periphery of the wooden structural material main body, and the structural material main body is coated over substantially the entire circumference. To be done.

As described above, since the periphery of the structural material body is covered with the fireproof coating material over substantially the entire circumference, joints are not formed, and it is difficult for smoke and flame to reach the wooden structure body. Therefore, the risk of the wood-based structure body being smoked is reduced.

Further, according to the eighth aspect, since the structural material coated with the fireproof material in advance can be mass-produced, the manufacturing cost can be reduced, and the construction work process at the time of building construction can reduce the manufacturing cost. It exhibits a practically useful effect that the workability can be improved by reducing the refractory coating process.

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional view illustrating the structure of a main part of a pillar material of Example 1 in a fireproof coating structure and a method of constructing a fireproof coating structure according to Embodiment 1 of the present invention.

FIG. 2 is a side view of the pillar material of Example 1 in the fireproof coating structure of Embodiment 1 and the method of constructing the fireproof coating structure.

[Fig. 3] Fig. 3 is a horizontal cross-sectional view illustrating the configuration of the main part of the pillar material of Example 2 in the fireproof coating structure and the method for constructing the fireproof coating structure according to Embodiment 1 of the present invention.

FIG. 4 is a side view of a pillar material of Example 2 in the fireproof coating structure of Embodiment 1 and the method of constructing the fireproof coating structure.

[Explanation of symbols]

1,11 Pillar (structure) 2 Fireproof coating 2a, 2b Upper and lower fire resistant coating materials 3 Wood pillar materials (structure material body) 4 Adhesive layer 5 glass cloth 6 stop 7,7a, 7b Joint part 7a, 7b Upper and lower layer joints

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2E001 DE01 DE04 EA09 FA02 GA24                       HD01 HD06 HD08 HF12 JA06                       JA13 JA17 JA21 JA22 JB01                 4J002 AC011 AC031 AC041 AC061                       AC071 AC081 AC091 BB021                       BB031 BB061 BB071 BB081                       BB111 BB151 BB171 BB241                       BB271 BC021 BD031 BD121                       BG001 BG041 BN151 CC031                       CD001 CG001 CH041 CH071                       CK021 CL001 CP031 DA016                       DA026 DA027 DA036 DA066                       DE076 DE086 DE096 DE116                       DE126 DE136 DE146 DE186                       DE236 DE246 DF006 DG046                       DG056 DH006 DJ006 DJ016                       DJ036 DJ037 DJ057 DK006                       DL006 FA046 FD016 FD207                       GL00

Claims (8)

[Claims] Claims: 1. A fire resistant fire resistant coating comprising a thermally expandable fire-resistant covering material around the surface of a main body of a wooden structure, and a joint portion which is a butt portion of the fire-resistant covering material being protected. Coating structure. 2. The fire-resistant coating structure according to claim 1, wherein when the fire-resistant coating material is laminated in a plurality of layers, joints in the laminating direction are staggered. 3. The fireproof coating material is 100 parts by weight of a thermoplastic resin or an epoxy resin, and a thermally expansive layered inorganic material 20-35.
Containing 0 parts by weight and 50 to 400 parts by weight of inorganic filler,
The total amount of the heat-expandable inorganic material and the inorganic filler is 200 to
The fireproof coating structure according to claim 1 or 2, which is formed from a resin composition of 600 parts by weight and expands by heating to form a fireproof heat insulating layer. 4. The fireproof coating structure according to claim 1, wherein the fireproof coating material is covered with a net or a sheet made of an incombustible fiber material. 5. The net or mat made of non-combustible fiber material is impregnated with the fireproof coating material, and / or the base material layer is provided on one or both sides of the fireproof coating material. The fireproof coating structure according to any one of claims 1 to 4. 6. The fireproof coating according to claim 1, wherein the fireproof coating or the joint portion is fixed by at least one of an adhesive and a stopper. Construction method of structure. 7. A thermally expansive refractory coating material is cast by casting.
A fire-resistant coating structure characterized in that it is applied by covering substantially the entire circumference of a main body of a wooden structural material and covering it. 8. A thermally expandable refractory coating material is cast
The method for constructing a fireproof coating structure according to claim 7, wherein the main body of the wooden structural material is covered and attached over the entire circumference.