JP2002209321A - Fire preventing and resisting construction of flush-type box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure sufficient resistance to fire, superior laying property, thin coating and necessary sound insulation. SOLUTION: A thermally expanding fireproof material 15, which covers the back and the side of a flush type box and can expand by heating so as to close an aperture part 7, is installed to the flush type box 8 which is fixed on the wall rear side of the aperture part 7 formed on the wall surface 1 of a building.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof structure for an embedded box.

[0002]

2. Description of the Related Art Conventionally, in buildings with three or more floors (such as apartment houses, hospitals, hotels, boarding houses, etc.), according to the Building Standard Law,
A fireproof structure having a predetermined fireproof performance is required.

In the above-mentioned fire-resistant structure, materials and structures having fire resistance are used for ceiling materials, partition walls, floor materials and the like.

[0004] For example, as a partition wall having fire resistance, there is a wall in which two pieces of reinforced gypsum board containing glass fiber of 15 mm are stretched and a steel stud is stretched on both sides.

[0005]

However, in order to mount an outlet, a lighting switch, and the like on the partition wall, for example, the portion must be cut out and embedded.

[0006] With respect to these buried portions, when a fire occurs, there is a problem that a flame enters from the portion and the fireproof performance is reduced.

[0007] For this reason, regarding the outlet part of a semi-fireproof building, a steel outlet box is used for an opening less than 100 cm2, and a steel outlet box is incombustible for an opening of 100 to 200 cm2. Heat insulating material (for example, rock wool having a thickness of 30 mm or more (density 40 kg /
Cubic cm) and fire protection coatings have been required for openings greater than 200 square cm.

[0008] However, these coating methods have a problem that they are complicated and require a lot of work, and a problem that sound is easily transmitted through the cut-out portion, thereby deteriorating the sound insulation performance.

Further, when a breaker box for a power supply, a fire-proof bell, and the like are also of a buried type, the area of the buried portion is particularly enlarged, which may cause a serious problem in fire resistance. For this reason, as described above, there is a method of covering the embedded type box with rock wool to cover the fireproof coating or covering with a calcical plate, but these materials are inferior in workability and the coating thickness is thick There was a disadvantage.

Accordingly, an object of the present invention is to solve the above-mentioned problems, to provide sufficient fire resistance, good workability, a thin coating thickness, and a necessary sound insulation performance. An object of the present invention is to provide a fireproof structure for a self-contained box.

[0011]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, there is provided an embedded type box attached to the back of an opening formed in a wall of a building. A heat-expandable refractory material which is expandable by heating is provided so as to cover the back and side surfaces of the embedded box and close the opening.

According to the first aspect of the present invention, the heat-expandable refractory material expands in the event of a fire. Even in the case of burning out, the expanded heat-expandable refractory material fills the gaps, so that the penetration of the flame does not occur and sufficient fire resistance performance can be obtained.

Also, since the structure is such that the back surface of the buried box is simply covered with a heat-expandable refractory material, the workability is good, the coating thickness is small, and the required sound insulation performance is also ensured. it can.

According to a second aspect of the present invention, the thermally expandable refractory material covers the rear surface and the side surface of the buried box and is attached to a peripheral edge of the opening behind the wall. I have.

According to the second aspect of the present invention, since the heat-expandable refractory is simply attached after the embedded box is attached to the back side of the wall of the opening, good workability can be obtained. be able to.

According to the third aspect of the present invention, the heat-expandable refractory material is coated on the back and side surfaces of the buried box and inserted into the opening together with the buried box. Features.

According to the third aspect of the present invention, since the embedded box previously coated with the heat-expandable refractory material is simply attached to the back side of the opening, good workability can be obtained. Can be.

According to a fourth aspect of the present invention, at least one of a metal plate, a metal foil, and a heat insulating material is laminated on at least one surface of the thermally expandable refractory material.

According to the fourth aspect of the present invention, at least one of a metal plate, a metal foil, and a heat insulating material is laminated on at least one surface of the thermally expandable refractory material. Fire resistance performance can be further improved.

In the invention described in claim 5, the heat-expandable refractory material has a volume expansion ratio of 3 to 100 times after being heated for 30 minutes under a heating condition of 50 kW / sq. Which is a material having a thickness of 0.1 to 5 mm.

According to the fifth aspect of the present invention, the thickness of the thermally expandable refractory material is 0.1 to 5 mm.
By doing so, a favorable result can be obtained. The thickness is 0.
When the thickness is less than 1 mm, the fire resistance is reduced, and when the thickness is more than 5 mm, the workability is reduced.

In the invention described in claim 6, the heat-expandable refractory material contains 50 to 500 parts by weight of an inorganic filler based on at least one of a thermoplastic resin and a rubber substance or 100 parts by weight of an epoxy resin. And at least 10 to 350 parts by weight of a layered inorganic substance which expands when heated.

According to the sixth aspect of the present invention, a preferable result can be obtained by making the heat-expandable refractory material the required composition.

[0024]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 4 show a first embodiment of the present invention.

First, the structure will be described. The wall 1 of the building shown in FIG. 1, for example, a partition wall 2 having fire resistance is 15 m in length.
It is configured such that two pieces of reinforced gypsum board 3 containing glass fiber of m are stuck on both sides of a steel stud 4.

When the partition wall 2 is provided with an outlet 5 for electricity or gas, a switch for lighting, a breaker, an antenna line, a telephone line, a communication line, or other equipment 6, an opening 7 is formed in the partition wall 2. Is formed, and the embedded box 8 is attached to the back side of the wall of the opening 7. For example, in the case of a switch 9 for lighting or the like, as shown in FIGS. 2 and 3, the embedded box 8 (lighting switch box 10)
A mounting frame 11 for mounting the switch 9 is screwed from the front side, and a plate 12 serving as a design surface is mounted from above by screwing or fitting.

The embedding type box 8 is made of steel, resin, composite material such as FRP, inorganic non-combustible material such as calcium silicate plate, gypsum board, slate plate and the like, semi-combustible material, organic material and inorganic material. A composite material of a system material is used.

In the first embodiment, the embedded box 8 attached to the back side of the wall of the opening 7 is heated by heating so as to cover the back and side surfaces of the embedded box 8 and close the opening 7. The expandable heat-expandable refractory material 15 is attached.

More specifically, as shown in FIG.
Of the heat-expandable refractory material 1 so as to cover the back and side surfaces of the
5 is attached, and the edge of the heat-expandable refractory material 15 is attached (attached) to the peripheral edge of the opening 7 on the back side of the wall.

The heat-expandable refractory material 15 has a power of 50 kW /
It is preferable that the material be a material having a thickness of 0.1 to 5 mm which can form a refractory and heat-insulating layer with a volume expansion ratio of 3 to 100 times after heating under a heating condition of square m for 30 minutes.

More specifically, the heat-expandable refractory material 15 is composed of at least one of a thermoplastic resin and a rubber substance or 100 parts by weight of an epoxy resin and 50 to 500 parts of an inorganic filler.
Parts by weight, of which at least 10 to 350 parts by weight of a layered inorganic substance which expands when heated.

The mounting method of the embedded type box 8 and the heat-expandable refractory material 15 is not particularly limited.
When 5 has adhesiveness, it may be laminated and fixed using the adhesive strength. When the heat-expandable refractory material 15 contains a material composed of at least one of a thermoplastic resin and a rubber substance, the material is excellent in flexibility and can be coated in accordance with the shape of the embedding box 8. It is preferably used. In addition, when coating is performed using these materials, it is possible to prevent a decrease in the sound insulation performance of the embedded portion, so that it is particularly preferably used.

If the heat-expandable refractory material 15 does not have adhesive strength, it can be bonded using an adhesive. In particular, when the resin component is an epoxy resin described later, if the epoxy resin is laminated before being cured, it can be adhered at the time of curing.

It is preferable that the heat-expandable refractory material 15 has at least one side laminated with a metal plate, a metal foil, and at least one auxiliary layer 16 of a heat insulating material.

Examples of the metal plate or metal foil include a metal plate such as an iron plate, a stainless steel plate, a galvanized steel plate, an aluminum-zinc alloy-plated steel plate, and an aluminum plate, and an aluminum foil, an aluminum glass cloth, an aluminum craft, a copper foil, A metal foil such as a gold foil may be used. The thickness of the metal plate is 0.1 to 5
A metal foil having a thickness of preferably 0.1 mm or less can also be used. Among them, a material in which aluminum foil is laminated with glass cloth, glass mat, carbon fiber, etc. is advantageous in terms of fire resistance because of its excellent heat reflection property of aluminum, and is thermally expanded due to heat resistance of glass cloth, glass mat, carbon fiber. Refractory material 1
5 can be protected and can be used particularly preferably. The thickness of the aluminum foil of the aluminum glass cloth is preferably 5 μm or more in consideration of handling. Further, the weight per unit area of glass cloth, glass mat, carbon fiber, and the like is preferably 5 g / square m, and when the weight is less than 5 g / square m, the protection of the heat-expandable refractory material 15 is inferior. The aluminum foil, glass cloth, glass mat, and carbon fiber are heat-laminated with polyethylene or the like, or laminated using an adhesive such as a nonflammable acrylic adhesive.

In order to further improve the fireproof performance,
An auxiliary layer 16 such as a heat insulating material may be laminated on the thermally expandable refractory material 15 and used. The above-mentioned heat insulating materials include calcium silicate board, fiber-mixed calcium silicate board, calcium carbonate board, gypsum board, reinforced gypsum board 3, perlite cement board, fiber reinforced cement board, wood chip cement board, wood flour cement board, slag gypsum board Slate board, ALC board, ceramic board, mortar, PC board, glass fiber reinforced concrete board, rock wool heat insulating board, glass wool, ceramic blanket, inorganic board such as alumina silica fiber felt; wire mesh, lath and the like. These may be used alone or a plurality of them may be used together.

The thickness of the heat insulating material is not particularly limited, but is preferably 0.2 to 50 mm in consideration of workability. When the thermal expansion refractory material 15 and the heat insulating material are used in combination, the lamination order is not particularly limited.
It is preferable to arrange the heat insulating material on the outside. When the heat-expandable refractory material 15 and the heat-insulating material are used in combination, the heat-expandable refractory material 15 and the heat-insulating material may be applied in a panel state in which both are laminated in advance, or may be applied separately sequentially.

In more detail, the first embodiment
As a heat-expandable refractory material 15 that satisfies the fire-insulation performance of
Particularly, a resin composition (I) containing at least one of a thermoplastic resin and a rubber substance, a neutralized heat-expandable graphite and an inorganic filler, or an epoxy resin, a neutralized heat-expandable graphite, Resin composition containing inorganic filler (I
It is preferred to use those formed from I).

Hereinafter, the resin composition (I) will be described.

As the resin composition (I), a resin composition comprising at least one of a thermoplastic resin and a rubber material, a neutralized heat-expandable graphite and an inorganic filler is used.

The thermoplastic resin and the rubber material are not particularly limited, and include, for example, a polyolefin resin such as a polypropylene resin, a polyethylene resin, a poly (1-) butene resin, a polypentene resin; a polystyrene resin; Acrylonitrile-butadiene-styrene resin,
Polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, phenolic resin, polyurethane resin, polybutene, polychloroprene, polybutadiene, polyisobutylene, butyl rubber, nitrile rubber, and the like,
These may be used alone or in combination of two or more.

The thermoplastic resin and the 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 above-mentioned ripened resin or rubber substance further includes
Cross-linking or modification may be performed as long as the fire resistance of the fire-resistant material is not impaired.

The method for cross-linking the thermoplastic resin 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 electron beam irradiation and the like can be mentioned.

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 was further neutralized by neutralizing with ammonia, an aliphatic lower 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 / rubber substance, dispersibility deteriorates, and deterioration of physical properties is inevitable.

Commercial products of the neutralized heat-expandable graphite include, 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 inorganic substances; Basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, barium carbonate and other metal carbonates; calcium salts such as calcium sulfate, gypsum fiber and 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 hydrated inorganic substance and the metal carbonate function as an aggregate, it is considered that they contribute to an improvement in strength and an increase in heat capacity of the refractory heat-insulating layer formed by the heating residue.

Further, the water-containing inorganic substance absorbs heat due to water generated by a dehydration reaction at the time of heating, so that a rise in temperature is reduced and high heat resistance is obtained, and 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.

The above-mentioned metal carbonates such as calcium carbonate and zinc carbonate can be used in combination with a phosphorus compound described below.
It is considered that the reaction with the phosphorus compound promotes expansion, and particularly when ammonium polyphosphate is used as the phosphorus compound, 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 particle size of the inorganic filler is 0.5 to
100 μm is preferable, and more preferably, about 1 to 50 μm.
m. Further, it is more preferable to use a combination of an inorganic filler having a large particle 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 hydrous 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.).

Commercially available calcium carbonates include, for example, “Whiten SB Red” (1.8 μm particle size) (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 further contain a phosphorus compound, if necessary. The phosphorus compound is not particularly limited and includes, for example, red phosphorus; various phosphate esters such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylendiphenyl phosphate; sodium phosphate; Metal phosphate salts such as potassium phosphate and magnesium phosphate; ammonium polyphosphates; and 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.

[0059]

Embedded image

In the formula, R1 and R3 each represent hydrogen, carbon number 1 to
It represents a 16 linear or branched alkyl group or an aryl group having 6 to 16 carbon atoms. R2 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 flame retardant effect is improved by adding a small amount of the above-mentioned red phosphorus. 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. Examples of commercially available products include “EXOLlT AP422” and “EXOLlT 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 blending amount of the resin composition (I) with the neutralized heat-expandable graphite is preferably 10 to 350 parts by weight based on 100 parts by weight of the thermoplastic resin / rubber substance. If the amount of the neutralized heat-expandable graphite is less than 10 parts by weight, sufficient heat-expandability cannot be obtained and 35
If the amount exceeds 0 parts by weight, uniform dispersion becomes difficult, so that it is difficult to form a uniform thickness.

The amount of the inorganic filler in the resin composition (I) is preferably 50 to 500 parts by weight based on 100 parts by weight of the thermoplastic resin / rubber substance. 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 which has been neutralized expands by heating to form a refractory 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), a resin composition comprising an epoxy resin, 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 bifunctional glycidyl ether type monomer include, for example, polyethylene glycol type, polypropylene glycol type, neopentyl glycol type, 1,6-hexanediol type, trimethylolpropane type, bisphenol A type and bisphenol F type. And propylene oxide-bisphenol A type and hydrogenated bisphenol A type.

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

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 amines, acid anhydrides, polyphenols, and polymercaptans. 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 same components as those used in the resin composition (I) are used as the neutralized heat-expandable graphite and the inorganic filler used in the resin composition (II).

In the above resin composition (II), the blending amount of the neutralized heat-expandable graphite is 10 to 100 parts by weight of the epoxy resin for the same reason as in the resin composition (I).
-350 parts by weight is 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 resin composition (II) may contain the same phosphorus compound as that used in the resin composition (I). The amount of the phosphorus compound is 50 parts by weight based on 100 parts by weight of the epoxy resin for the same reason as in the resin composition (I).
~ 200 parts by weight are preferred.

In the above resin composition (II), the total amount of the neutralized heat-expandable graphite and the inorganic filler is preferably from 200 to 600 parts by weight based on 100 parts by weight of the epoxy resin. The total amount of the neutralized heat-expandable graphite, the inorganic filler and the phosphorus compound is preferably from 200 to 600 parts by weight based on 100 parts by weight of the epoxy resin. In the above resin composition (II), by using an epoxy resin as the resin, the resin itself forms a char (carbonized) layer at the time of combustion, and forms a fire-resistant heat-insulating layer strong enough to maintain the shape.

In the resin compositions (I) and (II), the neutralized heat-expandable graphite expands by heating to form a refractory and 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) include
As long as the physical properties are not impaired, phenol-based, amine-based, sulfur-based antioxidants, metal harm inhibitors, antistatic agents, stabilizers, crosslinking agents, lubricants, softeners, pigments, etc. are added. Is also good.

The resin compositions (I) and (II) were prepared by mixing the above components with a Banbury mixer, a kneader mixer,
It can be obtained by kneading using a known kneading device such as a two-roll mill. The heat-expandable refractory material 15 is preferably used as a sheet in consideration of workability to a concrete structure, and the obtained resin compositions (I) and (II) are press-formed, for example. It can be formed into a sheet by a conventionally known forming method such as extrusion, calendering and the like.

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

Since the heat-expandable refractory material 15 expands in the event of a fire, the expanded heat-expandable refractory material 15 is not affected even if the wire is burned out due to a gap between the electric wires penetrating the embedded box 8 or the fire. Since the portion is filled, the flame does not penetrate, and sufficient fire resistance can be obtained.

Further, since the structure is such that the back surface of the embedded type box 8 is simply mounted so as to cover the back surface with the heat-expandable refractory material 15, the workability is good, the coating thickness is thin, and the required sound insulation performance is secured. be able to.

In the case of the first embodiment, the heat-expandable refractory material 1 is attached after the embedded box 8 is attached to the back of the wall of the opening 7.
Since only 5 is attached, good workability can be obtained.

Further, by laminating at least one of a metal plate, a metal foil, and a heat insulating material on at least one surface of the thermally expandable refractory material 15, the fire resistance performance can be further improved.

The present invention can be applied to an outlet 5 for electricity and gas, a switch 9 for lighting, a breaker, and a built-in box 8 for equipment 6 such as an antenna line, a telephone line, and a communication line. is there.

The thickness of the heat-expandable refractory material 15 is 0.1 to 5
mm is preferred. When the thickness is smaller than 0.1 mm, the fire resistance is reduced, and when the thickness is larger than 5 mm, the workability is reduced.

[0090]

Second Embodiment FIG. 5 shows a second embodiment of the present invention. The same or equivalent parts as those in the first embodiment will be described with the same reference numerals.

In the second embodiment, the back and side surfaces of the embedded box 8 are coated in advance with a heat-expandable refractory material 15 or the like, and the tip of the embedded box 8 is covered with the heat-expandable refractory material 15. It is attached so as to be inserted into the opening 7.

According to the second embodiment, since the embedded box 8 previously coated with the thermal expansion refractory 15 is simply attached to the back side of the wall of the opening 7, good workability can be obtained.

The other parts are the same as those of the first embodiment.
, And the same operation and effect can be obtained.

[0094]

EXAMPLES Preparation of heat-expandable refractory material 15 Butyl rubber, polybutene, hydrogenated petroleum resin, metallocene polyethylene resin, neutralized heat-expandable graphite, ammonium polyphosphate, and hydroxide in the amounts shown in Table 1 A resin composition consisting of aluminum and calcium carbonate is melt-kneaded with two rolls, and a predetermined thickness of a heat-expandable refractory material A,
B, C and D, E were obtained.

[0095]

[Table 1]

The components used in Table 1 are as follows. -Butyl rubber: "Butyl rubber #" manufactured by Exxon Chemical
065 ”Metallocene PE (polyethylene):“ EG8200 ”manufactured by Dow Chemical Co., Ltd. • Polybutene:“ Polybutene 1 ”manufactured by Idemitsu Petrochemical Co., Ltd.
00R "・ Hydrogenated petroleum resin:“ ESCOLETS 5320 ”manufactured by Tonex Corporation ・ Epoxy resin: manufactured by Yuka Shell Epoxy Co., Ltd. ・ Ammonium polyphosphate:“ AP422 ”manufactured by Clariant Co. ・ Neutralized thermally expandable graphite: manufactured by Tosoh Corporation "GR
EP-EG "・ Aluminum hydroxide:" Heidilite H- "manufactured by Showa Denko KK
31 ”・ Calcium carbonate:“ Whiteton BF3 ”manufactured by Bihoku Powder & Chemicals Co., Ltd.
00><Example1> As shown in FIG. 6, two reinforced gypsum boards 3 each containing 15 mm glass fiber were put on a steel stud 4 (C type, 65 × 40 × 0.6 t) with screws. I stopped it. A 7 × 12 cm opening 7 (opening area 84
Square cm), and open a steel outlet box 21 (7
× 12 × 3.5 cm). From the side of the steel stud 4 to the outlet box 21, a heat-expandable refractory material A (2 m
m) with an aluminum glass cloth substrate. Further, a double-walled gypsum board 3 containing 15 mm glass fiber was attached to a steel stud 4 to form a partition wall 2. The obtained partition wall 2 was subjected to a heating test in accordance with ISO834 for one hour.
The fire resistance was satisfied without the penetration of one part of the flame. In addition,
In the figure, reference numeral 22 denotes a temperature measuring unit. <Example 2> The same configuration as in Example 1 was adopted, except that the outlet box 21 was previously covered with a cover. The obtained partition wall 2 is ISO834
The heating test was performed for 1 hour in accordance with the above, but the fire resistance of the outlet box 21 was satisfied without fire penetration. <Embodiment 3> As shown in FIG. 7, a 7 × 12 cm opening 7 (opening area 84
Square cm). A steel outlet box 21 with an aluminum glass cloth base material of a heat-expandable refractory material B (1 mm thick) was previously attached to a steel outlet box 21. The outlet box 21 with the heat-expandable refractory material was attached. In addition, 15
A partition wall 2 was formed by attaching two pieces of reinforced gypsum board 3 containing glass fiber of 1 mm to a steel stud 4. The obtained partition wall 2 was subjected to a heating test according to ISO 834 for 1 hour, and the fire resistance was satisfied without the penetration of the flame of the outlet box 21 portion. <Comparative Example 1> As shown in FIG. 8, the heat-expandable refractory material A (2 mm
The partition wall 2 was formed in the same manner except that the thickness was not used. The obtained partition wall 2 was subjected to a heating test in accordance with ISO 834 for 1 hour. However, the penetration of flame occurred from the outlet box 21 portion, and the surface temperature on the back side of the outlet box 21 became 220 ° C., resulting in poor fire resistance. <Embodiment 4> As shown in FIG. 9, a 10 × 15 cm opening 7 (opening area 1
50cm2), steel lighting switch box 1
0 (10 × 15 × 5 cm). Heat switchable refractory material D from the side of steel stud 4 to lighting switch box 10
(1.5 mm thick) with an aluminum glass cloth substrate was stuck. Further, a double-walled gypsum board 3 containing 15 mm glass fiber was attached to a steel stud 4 to form a partition wall 2. The obtained partition wall 2 is ISO
A heating test was performed for 1 hour in accordance with 834, and the fire resistance of the outlet box 21 was satisfied without flame penetration. <Comparative Example 2> As shown in FIG. 10, the same procedure as in Example 2 was performed except that the lighting switch box 10 in the wall configuration of Example 3 was covered with a 25 mm-thick rock wool 23 (40K). The obtained partition wall 2 was subjected to a heating test in accordance with ISO 834 for 1 hour. However, a flame penetrated from the lighting switch box 10 and the surface temperature on the back side of the lighting switch box 10 became 220 ° C., resulting in poor fire resistance. Was. COMPARATIVE EXAMPLE 3 As shown in FIG. 11, a 50 mm thick rock wool
3 (40K) and attached to the partition wall 2, but the lighting switch box 10 protruded from the partition wall 2 and was defective. <Embodiment 5> As shown in FIG. 12, an opening 7 (opening area 8
00 square cm) and a steel breaker box 24
Was attached. Rock wool 23 (40K, 25 mm) with a thermally expandable refractory material A (2 mm thick) aluminum glass cloth base material from the steel stud 4 side in the breaker box 24
Thickness). Further, two reinforced gypsum boards 3 each containing 15 mm of glass fiber were attached to a steel stud 4 to form a partition wall 2. The obtained partition wall 2 is I
A heating test was performed for one hour in accordance with SO834, but the fire resistance of the breaker box 24 was satisfied without any penetration of the flame.

[0097] The partition wall 2 of Example 1 and Comparative Example 1 was measured for sound insulation, who Example 1 was excellent 2dB in TL _D value. <Examples 6 and 7> In the same configuration as in Example 3, the heat-expandable refractory material C (1.5 mm thick) and the heat-expandable refractory material E were respectively used.
(Thickness: 0.7 mm) was used in the same manner as in Example 2. The obtained partition wall 2 was subjected to a heating test according to ISO 834 for 1 hour, and the fire resistance was satisfied without the penetration of the large flame in the outlet box 21 portion.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in this invention.

For example, the heat-expandable refractory material 15 is not limited to a sheet-like material, and may cover the embedded box 8 by coating.

[0100]

As described above, according to the first aspect of the present invention, since the heat-expandable refractory material expands at the time of fire,
Even if the wire is burned out due to a gap in the wire portion penetrating the recessed box or a fire, the expanded heat-expandable refractory material fills the gap portion, so that no flame penetration occurs and sufficient Fire resistance performance can be obtained. In addition, since the structure is such that the back surface of the embedded box is simply covered with the heat-expandable refractory material, the workability is good, the coating thickness is thin, and the required sound insulation performance can be secured.

According to the second aspect of the present invention, since only the heat-expandable refractory is attached after the embedded box is attached to the back of the wall of the opening, good workability can be obtained.

According to the third aspect of the present invention, since the embedded type box previously coated with the heat-expandable refractory material is simply attached to the back side of the wall of the opening, good workability can be obtained.

According to the fourth aspect of the present invention, at least one of a metal plate, a metal foil, and a heat insulating material is laminated on at least one surface of the heat-expandable refractory material, thereby further improving the fire resistance performance. be able to.

According to the fifth aspect of the present invention, favorable results can be obtained by setting the thickness of the heat-expandable refractory material to 0.1 to 5 mm. When the thickness is smaller than 0.1 mm, the fire resistance is reduced, and when the thickness is larger than 5 mm, the workability is reduced.

According to the sixth aspect of the present invention, by setting the composition of the heat-expandable refractory material to a required composition, it is possible to obtain a practically useful effect that a favorable result can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wall surface according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a lighting switch box portion.

FIG. 3 is a sectional view of a lighting switch box.

FIGS. 4A, 4B, and 4C are partial views showing a procedure of the first embodiment.

FIGS. 5 (a) and 5 (b) are partial views showing an implementation procedure of a second embodiment of the present invention.

FIGS. 6A, 6B, and 6C are cross-sectional views illustrating a procedure of the first embodiment.

FIG. 7 is a partial sectional view of a third embodiment.

FIG. 8 is a partial cross-sectional view of Comparative Example 1.

FIG. 9 is a partial sectional view of a fourth embodiment.

FIG. 10 is a partial cross-sectional view of Comparative Example 2.

FIG. 11 is a partial sectional view of Comparative Example 3.

FIG. 12 is a partial sectional view of a fifth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wall 7 Opening 8 Embedded type box 15 Thermal expansion resistant refractory material

Claims (6)

[Claims] An embedded box attached to the back side of an opening formed in a wall surface of a building expands by heating so as to cover the back and side surfaces of the embedded box and close the opening. A fire-resistant structure for an embedded box, which is provided with a heat-expandable fire-resistant material. 2. The embedding device according to claim 1, wherein said heat-expandable refractory material covers a back surface and side surfaces of said embedding type box and is attached to a peripheral portion of a wall behind said opening. Fireproof structure of the mold box. 3. The refractory material according to claim 1, wherein said refractory material is coated on the back and side surfaces of said box and inserted into said opening together with said box. Fireproof structure of the flush box. 4. The heat-expandable refractory material on at least one side thereof,
4. The fireproof structure of an embedded box according to claim 1, wherein at least one of a metal plate, a metal foil, and a heat insulating material is laminated. 5. The heat-expandable refractory material is 50 kW / square m.
Volume expansion ratio after heating for 30 minutes under heating conditions of 3 to
Thickness of 0.1, which can be 100 times to form a refractory insulation layer
The fireproof structure of an embedded box according to any one of claims 1 to 4, wherein the fireproof structure is made of a material having a size of 5 to 5 mm. 6. The heat-expandable refractory material comprises at least one of a thermoplastic resin and a rubber material, or an epoxy resin 100.
The inorganic filler is contained in an amount of 50 to 500 parts by weight based on parts by weight, and at least 10 to 350 parts by weight of a layered inorganic substance which expands upon heating is contained.
6. A fireproof structure for an embedded type box according to any one of claims 1 to 5.