JP2002081148A - Fire preventive, resistant wall construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire preventive, resistant wall construction capable of stopping fire flame and smoke to the opposite side beyond a fire preventive covering member by closing gaps even though metal runners are deformed by the high temperature during fire and gaps are created between the fire preventive, resistive covering members and ceilings or floors. SOLUTION: In a fire preventive, resistive wall construction formed by erecting fire preventive, resistive members 2 at ceiling and floor, the fire preventive, resistive covering members are fixed to the ceiling member 3 and floor member 4 via runners 1 and 1 to which the fire preventive, resistive members are respectively installed to the ceiling member 3 and floor member 4, and thermally expansive fire resistant member 6 forming a fire resistant insulation layer after the expansion by fire is respectively inserted between the runners 1 and 1 and ceiling member 3 and the floor member 4 thereby forming the fire preventive, resistant wall construction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant wall structure provided between a ceiling and a floor.

[0002]

2. Description of the Related Art Conventionally, when a fire-resistant wall structure is provided between a ceiling and a floor, a metal runner 11 having a U-shaped cross section is attached to a ceiling material 13 and a floor material 14, as shown in FIG. The upper and lower ends of the fireproof coating material 12 are inserted and fixed in the U-shaped grooves 17 of the runner 11 respectively. To fix the runner 11, the rear surface of the runner 11 is
3 or a floor material 14 and a method of fastening to a ceiling material 13 or a floor material 14 using a fixing metal fitting 15 (for example, a bolt) is performed.

As the fireproof coating material, for example, gypsum board, slate board, ALC board, PC board, calcium silicate board and the like are used.

In the above fire-resistant wall structure, when exposed to a high temperature at the time of a fire, the runner 11 undergoes thermal deformation and the ceiling material 13
Alternatively, a gap may be formed between the floor material 14 and the flame or smoke reaching the opposite side beyond the fire-resistant wall structure from such a gap, and there is a risk of burning. Therefore, the entire runner 11 is covered with the refractory material 16 to prevent the runner 11 from being thermally deformed even when exposed to a high temperature at the time of fire.

As the refractory material 16, for example, rock wool, ceramic blanket or the like is used. However, when using rock wool as the refractory material, it is necessary to cover it by spraying, and when using a ceramic blanket, it is necessary to use a fireproof adhesive to cover it. There was a problem that it was difficult.

[0006]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a method in which a metal runner is deformed by a high temperature in a fire, and a gap is formed between a fireproof coating and a ceiling or a floor. Even if there is a fire barrier, it is an object of the present invention to provide a fire-resistant wall structure capable of blocking a gap and preventing a flame or smoke from reaching the opposite side beyond the fire-resistant coating.

[0007]

The fire-resistant wall structure according to the present invention is a fire-resistant wall structure formed by erecting a fire-resistant coating material between a ceiling and a floor, wherein the fire-resistant coating material is a ceiling material and a floor. 50 kW / sec, which is fixed to the ceiling material and the floor material via the runners respectively attached to the materials, and expands by heating to form a refractory insulation layer between the runner and the ceiling material and the floor material.
The expansion ratio in the thickness direction (thickness after expansion d ₁ / thickness before expansion d ₀ ) when heated for 30 minutes under heating conditions of m ² is 3 to _1.
It is characterized in that a heat-expandable refractory material having a magnification of 00 is inserted and inserted.

Hereinafter, the present invention will be described in detail. The fire-resistant wall structure of the present invention is a fire-resistant wall structure formed by erecting a fire-resistant covering material between a ceiling and a floor, and will be described with reference to a schematic longitudinal sectional view shown in FIG. In the figure, 1 indicates a metal runner, 2 indicates a fireproof coating material, 3 indicates a ceiling material, and 4 indicates a floor material.

When the fire-resistant wall structure is formed between the ceiling and the floor, a metal runner 1 having a U-shaped cross section is attached to the ceiling member 3 and the floor member 4, respectively.
1, a fireproof coating material 2 is erected between the ceiling and the floor.
The metal runner 1 is attached so as to correspond to the entire length of the upper and lower ends of the fireproof coating material 2. Fireproof coating 2
The upper and lower ends of the metal runners 1 are fixed by inserting them into concave grooves 7 having a U-shaped cross section.

[0010] The metal runners 1 and 1 are provided with fixing brackets 5.
(For example, bolts), each of which is attached to the ceiling material 3 and the floor material 4. When the fireproof covering material 2 is inserted into the U-shaped groove 7 of the metal runner 1, the bolt head is used. When the protrusion of the part is an obstacle, it is preferable to use, for example, a flat bolt having no protrusion on the head as the fixing metal fitting 5.

In the fire-resistant wall structure of the present invention, the thermally expandable fire-resistant materials 6 and 6 are inserted between the metal runner 1 and the ceiling material 3 and the floor material 4 respectively. This heat-expandable refractory material 6
The metal runners 1 and 1 are fixed to the ceiling material 3 by using the fixing metal 5.
When the metal runner 1 is attached to the floor material 4, the metal runner 1 can be inserted simultaneously. The heat-expandable refractory material 6 is preferably used as a sheet in consideration of workability at the time of insertion.

Further, in order to increase the efficiency of fixing the fireproof coating 2 to the ceiling 3 and the floor 4, respectively, the metal runner 1 having a U-shaped cross section is shown in FIG. As described above, the metal runners 1a, 1a having an L-shaped cross section may be used facing each other. When using the metal runner 1a having an L-shaped cross section, the L-shaped metal runner 1a on one side is attached to the ceiling material 3 and the floor material 4 in advance, and then the fireproof coating material 2 is set up. In this state, the upper and lower ends of the metal runners 1a, 1a are brought into contact with the metal runners 1a, 1a, and then the other metal runners 1a, 1a having an L-shaped cross section are attached to the ceiling material 3 and the floor material 4, respectively.

When the metal runner 1a having an L-shaped cross section is used, the heat-expandable refractory material 6 may be a single continuous material as shown in FIG. As shown in (b), it may be divided into two. FIG.
The metal runner 1a and the heat-expandable refractory material 6 are
FIG. 2 shows a schematic vertical sectional view of a fire-resistant wall structure arranged by the method (A).

As the material of the metal runner, for example, a steel plate, a galvanized steel plate, an aluminum galvanized steel plate or the like is used, and the thickness is preferably 0.1 to 3 mm, more preferably 0.3 to 1.6 mm. It is.

[0015] Examples of the fire-resistant coating material include gypsum board, slate board, ALC board, PC board, ceramic board, concrete board, calcium silicate board, hydrated inorganic substance containing board, wood chip cement board and the like. These may be used in combination.

The above-mentioned heat-expandable refractory material is a material which expands upon heating of a fire or the like to form a fire-resistant heat-insulating layer and exhibits fire-resistant performance, and has a heat resistance of 30 kW / m ^2.
A material having an expansion ratio in the thickness direction (thickness d ₁ after expansion / thickness d ₀ before expansion) of 3 to 100 times when heated for one minute is used. When the expansion ratio (d ₁ / d ₀ ) is less than 3 times, the heat insulating performance of the refractory heat insulating layer formed by heating is insufficient,
If it does not exhibit sufficient fire resistance performance and exceeds 100 times, the strength of the fire-resistant heat-insulating layer is insufficient and the fire-resistant heat-insulating layer tends to collapse.

In the present invention, the heat-expandable refractory material comprises:
Particularly, a resin composition (I) containing a thermoplastic resin and / or a rubber substance, a neutralized heat-expandable graphite and an inorganic filler, or an epoxy resin, a neutralized heat-expandable graphite and an inorganic filler Those formed from the resin composition (II) containing the agent are preferred.

Hereinafter, the resin composition (I) will be described. As the resin composition (I), a resin composition comprising a thermoplastic resin and / or a rubber substance, neutralized thermally expandable graphite, and an inorganic filler is used.

The thermoplastic resin and / or rubber material is not particularly limited. For example, polyolefin resins such as polypropylene resin, polyethylene resin, poly (1-) butene resin and polypentene resin; polystyrene resin Resin, acrylonitrile-butadiene-styrene resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, phenol resin, polyurethane resin, polybutene, polychloroprene, polybutadiene, polyisobutylene Butyl rubber, nitrile rubber, etc., which may be used alone.
More than one species may be used in combination.

The thermoplastic resin and / or rubber substance 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, adhesiveness, and the like of the resin.

The thermoplastic resin and / or rubber substance may be further cross-linked or modified as long as the fire resistance of the fire-resistant material is not impaired. The method for cross-linking the thermoplastic resin and / or rubber substance is not particularly limited, and a cross-linking method generally used for a thermoplastic resin or rubber substance, for example, a cross-linking method using various cross-linking agents or peroxides, A cross-linking method by irradiation with a beam may be used.

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 it with ammonia, a lower aliphatic amine, an alkali metal compound, an alkaline earth metal compound or 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.

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.

As a commercially available product of the neutralized heat-expandable graphite, for example, “Frame Cut GRE” manufactured by Tosoh Corporation
P-EG "," GRAFG "manufactured by UCAR Carbon
UARD ”and the like.

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 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, dewatered 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 above-mentioned hydrated inorganic substance and metal carbonate function as an aggregate, it is considered that they contribute to improvement of the strength and heat capacity of the refractory heat-insulating layer formed by the heating residue.

Further, the above-mentioned hydrated inorganic substance is endothermic due to water generated by a dehydration reaction during heating, and the temperature rise is reduced so that high heat resistance is obtained. Also, an 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 dehydration effect is exhibited, so when used together, the temperature range in which the dehydration effect is exhibited becomes wider, and a more excellent temperature rise suppression effect can be obtained. preferable.

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

The inorganic filler has a particle size of 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 diameter and a filler having a small particle diameter. By using the inorganic filler in combination, the resin composition (I) is highly filled while maintaining the mechanical performance. It becomes possible.

Commercial products of the above-mentioned hydrated inorganic substances include, for example, aluminum hydroxide, "Hygilite H-42M" having a particle size of 1 μm (manufactured by Showa Denko KK) and "Hygilite H-31" having a particle size of 18 μm (Showa Denko). Electric Works Co., Ltd.).

Examples of commercially available calcium carbonate include "Whiteton SB Red" having a particle size of 1.8 μm (manufactured by Shiraishi Calcium Co., Ltd.) and "Whiten BF30 having a particle size of 8 μm.
0 "(manufactured by Bihoku Powder Chemical Co., Ltd.) and the like.

The above resin composition (I) may optionally contain a phosphorus compound. Examples of the phosphorus compound include, but are not particularly limited to, red phosphorus; various phosphate esters such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, and xylendiphenyl phosphate; sodium phosphate; Metal phosphates such as potassium phosphate and magnesium phosphate; ammonium polyphosphates;
Examples include compounds represented by the following general formula (1). Among these, from the viewpoint of fire resistance performance, 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.

[0035]

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 include:
Not particularly limited, for example, ammonium polyphosphate, melamine-modified ammonium polyphosphate and the like,
Ammonium polyphosphate is preferably used from the viewpoint of handleability and the like. Commercially available products include, for example, “EXOLIT AP422” and “EXOLIT AP” manufactured by Clariant.
462 ", Sumitomo Chemical Co., Ltd." Sumisafe P ", Chisso Corporation" Terage C60 "," 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, dimethyl methylphosphonate, diethyl methylphosphonate, 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 amount of the resin composition (I) to be blended with the neutralized heat-expandable graphite is 10 to 350 with respect to 100 parts by weight of the thermoplastic resin and / or rubber substance.
Parts by weight are preferred. If the blending amount of the neutralized heat-expandable graphite is less than 10 parts by weight, sufficient thermal expansion properties cannot be obtained, and if it exceeds 350 parts by weight, uniform dispersion becomes difficult. It will be difficult to do.

The compounding amount of the inorganic filler in the resin composition (I) may be selected from thermoplastic resin and / or rubber material 10
50 to 500 parts by weight per 0 parts by weight is preferred. If the amount is less than 50 parts by weight, a resin composition having sufficient fire resistance cannot be obtained. If the amount exceeds 500 parts by weight, the mechanical properties of the resin composition deteriorate.

In the resin composition (I), the heat-expandable graphite that has been neutralized expands by heating to form a refractory and heat-insulating layer, thereby preventing the transmission of flame and heat. Phosphorus compounds are
Heating causes dehydration and foaming and acts as a carbonization catalyst. At that time, the inorganic filler contributes to an increase in heat capacity, and the phosphorus compound imparts a shape-retaining ability to the refractory heat-insulating layer.

Next, the resin composition (II) will be described. As the resin composition (II), an epoxy resin,
What consists of neutralized heat-expandable graphite and an inorganic filler is used.

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 above-mentioned 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 monomers such as phenol novolak type, orthocresol novolak type, DPP novolak type, and dicyclopentadiene / phenol type.

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.

The neutralized thermally expandable graphite and inorganic filler used in the resin composition (II) include:
The same components as those used in the resin composition (I) are used.

In the resin composition (II), the blending amount of the neutralized heat-expandable graphite is 10 to 10 parts by weight of the epoxy resin for the same reason as the resin composition (I).
350 parts by weight are preferred. In addition, the amount of the inorganic filler is set to the same value as in the case of the resin composition (I).
50 to 500 parts by weight per 100 parts by weight is preferred.

The same phosphorus compound as that used in the resin composition (I) may be blended in the resin composition (II).

In the above resin composition (II), by using an epoxy resin as the resin, the resin itself forms a char (carbonized) layer when burning, and forms a fire-resistant heat-insulating layer strong enough to maintain its shape. I do.

In the above resin compositions (I) and (II), the neutralized heat-expandable graphite expands by heating to form a refractory heat-insulating layer, thereby preventing the transmission of flame and heat. The phosphorus compound dehydrates and foams by heating and acts as a carbonization catalyst. At that time, the inorganic filler contributes to an increase in heat capacity, and the phosphorus compound imparts a shape-retaining ability to the refractory heat-insulating layer.

The resin compositions (I) and (II) may be phenol-based, amine-based or resin-based as long as their physical properties are not impaired.
In addition to sulfur-based antioxidants, metal harm inhibitors, antistatic agents, stabilizers, crosslinking agents, lubricants, softeners, pigments, and the like may be added.

The above resin compositions (I) and (II) can be obtained by kneading the above components using a known kneading device such as a Banbury mixer, a kneader mixer, or a two-roll mill. The resin compositions (I) and (II)
The heat-expandable refractory material can be formed into a sheet by a conventionally known molding method such as press molding, extrusion molding, and calender molding.

The above-mentioned heat-expandable refractory material forms a refractory heat-insulating layer at the time of a fire to suppress a rise in the temperature of the metal runner. Even if there is a gap, the heat-expandable refractory material expands to form a fire-resistant heat-insulating layer and closes the gap, so that flames, smoke, etc. reach the opposite side beyond the fire-resistant structure wall Is prevented.

In the above-described conventional fire-resistant wall structure, sound insulation performance is reduced due to solid propagation of sound through the runner portion. However, in the fire-resistant wall structure of the present invention, thermally expandable graphite,
Since the thermally expandable refractory material containing an inorganic filler or the like and having elasticity is inserted between the runner and the ceiling or floor, solid propagation of sound is suppressed and sound insulation performance is improved.

[0060]

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

Preparation of heat-expandable refractory material The following amounts of butyl rubber, polybutene, epoxy resin, hydrogenated petroleum resin, neutralized heat-expandable graphite, aluminum hydroxide, calcium carbonate, and polyphosphorus in the amounts shown in Table 1. The resin composition composed of ammonium acid is melt-kneaded with two rolls and heat-expandable refractory materials A, B, C and D having a predetermined thickness are formed.
I got Each of the above-mentioned heat-expandable refractory materials was irradiated with a heat of 50 kW / m ² for 30 minutes to expand the thickness, and each thickness was measured. 1 is shown. Expansion magnification [times] = (thickness after irradiation d ₁ / thickness before irradiation d ₀ )

[0062]

[Table 1]

(Examples 1 and 2) The fireproof coating 2 (100 mm thick ALC plate), the heat-expandable fireproof material 6 and the metal runner 1 (steel, 100 mm wide, U-shaped section) shown in Table 2 ) Was used to produce a fire-resistant wall structure (test body) having the structure shown in FIG.

(Examples 3 and 4) The fireproof coating 2 (35 mm thick calcium silicate plate), the heat-expandable refractory 6 and the metal runner 1 (steel, 35 mm wide section shown in Table 2) A fire-resistant wall structure (test body) having the structure shown in FIG. 1 was prepared.

(Examples 5 and 6) Fireproof coating 2 (100 mm thick ALC plate), heat-expandable fireproof 6 and metal runner 1a (steel, L-shaped section 40 mm wide) shown in Table 3 A fire-resistant wall structure (test body) having the structure shown in FIG.

(Examples 7 and 8) Fireproof coating 2 (calcium silicate plate 35 mm thick), heat-expandable fireproof material 6 and metal runner 1a (steel, 15 mm wide cross section L shown in Table 3) A fire-resistant wall structure (test body) having the structure shown in FIG.

(Comparative Examples 1 to 8) A fire-resistant structural wall (test body) produced in Example 1 without using any heat-expandable refractory material was used as Comparative Example 1, and Example 2 was repeated in the same order. ~ 8
According to Comparative Examples 2 to 8, fire-resistant wall structures (test specimens) prepared without using any heat-expandable refractory material were used.

[0068]

[Table 2]

[0069]

[Table 3]

The fireproof wall structure (test body) of each of Examples 1 to 8 was subjected to a fire resistance test for one hour in accordance with ISO 834. As a result, the heat-expandable fireproof material expanded to form a fireproof heat-insulating layer. However, the gap created by the deformation of the runner was completely closed, and the penetration of the flame did not occur. However,
In a similar one-hour fire resistance performance test performed on the fire-resistant structure walls (test specimens) of Comparative Examples 1 to 8, the penetration of the flame occurred from the gap generated by the deformation of the runner.

Further, the fire-resistant wall structure of the first embodiment and the conventional fire-resistant wall structure shown in FIG.
When the sound pressure level difference at the site of the building was measured in accordance with No. 17, the fireproof structure wall of Example 1 was found to have 20
At the frequencies of 00 Hz and 4000 Hz, an improvement in the sound pressure level difference of 2 dB was recognized.

[0072]

The fire-resistant wall structure of the present invention has the above-mentioned structure, and the heat-expandable refractory material expands due to the high temperature at the time of fire to form a fire-resistant heat-insulating layer, thereby suppressing a rise in the temperature of the metal runner. At the same time, even if the metal runner is deformed due to the high temperature at the time of fire and a gap is created between the fireproof coating and the ceiling or floor, the gap is closed and the flame or smoke is coated with the fireproof coating. It can be prevented from reaching the other side over the material.
In addition, the heat-expandable refractory material can be easily installed when the metal runner is attached to the ceiling material and the floor material,
Sound insulation performance can be improved by using a heat-expandable refractory material.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing one example of a fire-resistant wall structure of the present invention.

FIGS. 2A and 2B are schematic cross-sectional views showing, in an enlarged manner, a mounting state of a metal runner having an L-shaped cross section.

FIG. 3 is a schematic longitudinal sectional view showing another example of the fire-resistant wall structure of the present invention.

FIG. 4 is a schematic vertical sectional view showing a conventional fire-resistant wall structure.

[Explanation of symbols]

 1, 1a, 11 Runner 2, 12 Fireproof covering material 3, 13 Ceiling material 4, 14 Floor material 5, 15 Fixing bracket 6 Thermal expansible fireproof material 7, 17 Groove

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E001 DE01 FA03 GA12 GA24 GA53 GA55 HA01 HA02 HA03 HA04 HA21 HB02 HD11 HE01 HF12 JA00 LA01 LA06 MA03 MA04 2E002 EB12 KA01 KA07 LC02 MA37 MA38

Claims (3)

[Claims] In a fire-resistant wall structure formed by erecting a fire-resistant coating between a ceiling and a floor, the fire-resistant coating is connected to the ceiling material and a runner attached to the floor material. Fixed to the floor material, expands by heating to form a refractory insulation layer between the runner and the ceiling material and floor material,
Expansion ratio in the thickness direction when heated under heating conditions of 50 kW / m ² for 30 minutes (thickness d ₁ after expansion / thickness d before expansion d
_A fire-resistant wall structure, characterized in that a heat-expandable refractory material whose ( ₀ ) is 3 to 100 times is inserted. 2. The heat-expandable refractory material comprises a thermoplastic resin and / or
The fire-resistant wall structure according to claim 1, comprising a resin composition (I) containing a rubber material, neutralized heat-expandable graphite and an inorganic filler. 3. The fire-resistant material according to claim 1, wherein the heat-expandable refractory material comprises a resin composition (II) containing an epoxy resin, neutralized heat-expandable graphite, and an inorganic filler. Fire wall structure.