JP2000001926A - Fire resistant steel frame covering body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire resistant steel frame covering body excellent in workability, executable to be flush with the indoor side wall surface and excellent in fire resisting performance since a fire-resistant heat-insulating layer formed during heating is held unruptured. SOLUTION: The periphery of an H-shape steel 1 is covered with a laminated body comprising a sheet A formed of incombustible material and a sheet B formed of adiabatic expansion material, to the length of flanges 2, 2' of the H-shape steel 1. Heat insulating material is arranged between the laminated body and the flanges 2, 2' of the H-shape steel 1, and in hollow parts 5, 5' formed by the laminated body and the H-shape steel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant steel frame covering provided with a fire-resistant coating, and more particularly to a fire-resistant steel frame covering excellent in fire resistance used for columns, beams and the like of general buildings. Things.

[0002]

2. Description of the Related Art In recent years, lightweight steel frames have been used as beams, columns, etc., which are structural materials of buildings in apartment houses and individual houses. Steel frames used as structural materials for such buildings include Ministry of Construction Notification No. 2999 and J.
A fire resistance performance standard is defined by IS A 1304, and a method of coating the surface of a steel frame with a material having excellent fire resistance (fire-resistant coating material) is generally implemented in order to satisfy the standard.

[0003] However, the conventional refractory coating has a refractory certification for one hour and has a thickness of 21 to 40 mm.
When the refractory coating material having such a thickness is used, as shown in a schematic cross-sectional view of FIG. 6, the thickness of the steel frame provided with the refractory coating material is larger than the thickness of the wall, and the column shape is the wall shape. Since it protrudes more indoors, there are problems such as poor fit with fittings and narrowing of layout.

[0004] If the wall thickness is increased in order to maintain the flushness with the pillar shape provided with a thick fire-resistant coating material, there is a problem that the effective floor area is reduced.
In addition, there is a demand for a refractory coating material that is as thin as possible.

[0005]

SUMMARY OF THE INVENTION In view of the above, the present invention has excellent workability and can be constructed so as to be flush with the indoor side wall, and the fire-resistant heat-insulating layer formed during heating is destroyed. An object of the present invention is to provide a refractory steel frame covering excellent in fire resistance performance because it is held without being fired.

[0006]

According to the present invention, there is provided a refractory steel frame covering according to the present invention, wherein the periphery of the H-shaped steel is formed by a laminate of a sheet made of a noncombustible material and a sheet made of an adiabatic inflatable material. It is characterized in that a heat insulating material is disposed between the laminate and the H-shaped steel flange portion and in a hollow portion formed by the laminate and the H-shaped steel.

[0007] To cover according to the length of the H-shaped steel flange portion, as shown in an example in Fig. 5, a sheet made of a non-combustible material is used to form an H-shaped steel without leaving a margin in the length direction of the flange portion. The thickness of the coating in this direction is reduced as much as possible to improve the wall fit.

[0008] Sheets made of the above non-combustible material include:
It is not particularly limited as long as it has nonflammability, for example,
Metal plate materials such as steel plate, galvanized steel plate, stainless steel plate, aluminum / zinc alloy plate and aluminum plate; calcium silicate plate, fiber-mixed calcium silicate plate, calcium carbonate plate, gypsum board plate, reinforced gypsum plate, perlite cement plate, fiber Inorganic plates such as reinforced cement board, wood chip cement board, wood powder cement board, slag gypsum board and the like; sheet-like materials such as rock wool heat insulating board, ceramic wool blanket, alumina silica fiber felt, ceramic paper, aluminum hydroxide paper and the like. . The sheet made of the non-combustible material may be a sheet obtained by laminating a plurality of these sheets.

The sheet made of the noncombustible material is preferably a thin metal plate (foil). The thin metal plate absorbs the expansion without breaking or cutting due to deformation or bending when the sheet made of the adiabatic expansion material expands. The thickness of the metal plate is preferably 0.1 to 1 mm. When the thickness is less than 0.1 mm, it does not function as a flameproofing material or a shape maintaining material. When the thickness exceeds 1 mm, it is difficult to secure an expansion allowance due to bending.

The heat insulating material is not particularly limited as long as it has heat insulating properties, and general-purpose materials can be used. As the heat insulating material, for example, a known heat insulating material such as rock wool, glass wool, heat-resistant glass wool, and ceramic wool is used. Further, the heat insulating material disposed between the sheet made of a noncombustible material and the flange and the heat insulating material disposed in the hollow portion may be different materials.

The thickness of the heat insulating material disposed in the hollow portion is preferably 5 to 30 mm. If the thickness is less than 5 mm, sufficient heat insulating properties cannot be provided, and if it exceeds 30 mm, the workability is reduced due to the increase in weight.

The adiabatic expansion material is a material having the property of expanding when heated. As this adiabatic expansion material,
The material is not particularly limited as long as it expands by heating to form a heat-insulating layer having fire resistance. For example, a resin composition containing a thermoplastic resin and / or a rubber substance, a phosphorus compound, and an inorganic filler is preferable. By molding the above resin composition into a sheet, a sheet made of an adiabatic inflatable material (hereinafter referred to as an adiabatic inflatable sheet) is obtained.

The thermoplastic resin and / or rubber material is not particularly limited, and examples thereof include polypropylene resins, polyethylene resins, polyolefin resins such as polybutene, poly (1-) butene resins, polypentene resins, Polystyrene resin, acrylonitrile-butadiene-styrene resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, phenol resin,
Polyurethane resin, butyl rubber, polychloroprene,
Examples thereof include polybutadiene, polyisobutylene, and nitrile rubber.

Among them, halogenated resins such as chloroprene-based resins and chlorinated butyl-based resins have high flame retardancy per se, and are crosslinked by a dehalogenation reaction by heat, and the strength of the residue after heating is high. Is preferred in that the The thermoplastic resin and / or rubber substance exemplified above are very flexible and have rubber-like properties, so that the inorganic filler can be highly filled, and the obtained resin sheet is flexible. It becomes flexible. In order to obtain a more flexible and flexible resin sheet, a non-vulcanized rubber or a polyethylene resin is preferably used.

[0015] The thermoplastic resin and / or rubber substance may be:
They may be used alone or in combination of two or more. A blend of two or more resins may be used as the base resin in order to adjust the melt viscosity, flexibility, 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 resin composition is not impaired. When cross-linking or modifying the thermoplastic resin and / or rubber substance, the thermoplastic resin and / or rubber substance which has been previously cross-linked and modified is mixed with other components such as a phosphorus compound and an inorganic filler described below. Alternatively, crosslinking or modification may be performed simultaneously with or after blending other components.

The cross-linking method is not particularly limited, and a cross-linking method generally used for a thermoplastic resin or a rubber material, for example, a cross-linking method using various cross-linking agents, peroxides, etc., a cross-linking method by electron beam irradiation, etc. Is mentioned.

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

[0019]

Embedded image

In the formula, R ¹ and R ³ represent a hydrogen atom, a linear or branched alkyl group having 1 to 16 carbon atoms, or
Represents 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, an aryl group having 6 to 16 carbon atoms, or 6-1
6 represents an aryloxy group.

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

The above ammonium polyphosphates are not particularly limited, and include, for example, ammonium polyphosphate and melamine-modified ammonium polyphosphate. Of these, ammonium polyphosphate is preferably used from the viewpoint of handleability and the like. As a commercially available product, for example, "AP4" manufactured by Hoechst
22, "AP462", "Sumisafe P" manufactured by Sumitomo Chemical Co., Ltd., "Terage C60", "Terage C70", "Terage C80" and the like manufactured by Chisso.

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-butyl phosphonic 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 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. Among these, hydrous inorganic substances and metal carbonates are preferred.

The above-mentioned hydrated inorganic substances such as magnesium hydroxide and aluminum hydroxide endothermic due to water generated by the dehydration reaction at the time of heating, so that the temperature rise is reduced and high heat resistance is obtained. Oxide remains as a residue, and it is particularly preferable in that it functions as an aggregate to improve the strength of the residue. Magnesium hydroxide and aluminum hydroxide have different temperature ranges in which the dehydrating effect is exhibited.
It is preferable to use them together because a more effective temperature rise suppression effect can be obtained.

The above metal carbonates such as calcium carbonate and zinc carbonate are considered to promote swelling by reaction with the above phosphorus compound. In particular, when ammonium polyphosphate is used as the phosphorus compound, a high swelling effect is obtained. Can be Further, the metal carbonate functions as an effective aggregate, and forms a residue having high shape retention after burning.

Among the above metal carbonates, alkali metal carbonates such as sodium carbonate; magnesium carbonate;
Preferred are alkaline earth metal carbonates such as calcium carbonate and strontium carbonate; and carbonates of Group IIb metals of the periodic table such as zinc carbonate.

Generally, the above-mentioned inorganic filler acts as an aggregate, and is considered to contribute to improvement in residue strength and increase in heat capacity. The inorganic fillers may be used alone or in combination of two or more.

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

In addition to the thermoplastic resin and / or rubber substance, the phosphorus compound and the inorganic filler, neutralized heat-expandable graphite and polyhydric alcohol may be added to the resin composition.

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 with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound, etc. Heat-expandable graphite.

The aliphatic lower amine is not particularly restricted but includes, for example, monomethylamine, dimethylamine,
Trimethylamine, ethylamine, propylamine, butylamine and the like. The alkali metal compound and the alkaline earth metal compound are not particularly limited,
For example, hydroxides, oxides, carbonates, sulfates, organic acid salts of potassium, sodium, calcium, barium, magnesium and the like can be mentioned. Commercial products of the neutralized heat-expandable graphite include, for example, “GR manufactured by Tosoh Corporation”
EP-EG "," GRAFGUARD "manufactured by UCAR, and the like.

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

The above polyhydric alcohol is a hydrocarbon compound having two or more hydroxyl groups in the molecule, and has 1 carbon atom.
~ 50 is preferred. As the polyhydric alcohol, for example,
Ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, 1,4-butanediol, 1,6-hexanediol, monopentaerythritol, dipentaerythritol, tripentaerythritol, neopentaerythritol, sorbitol,
Examples include inositol, mannitol, glucose, fructose, starch, cellulose and the like. The polyhydric alcohols may be used alone or in combination of two or more.

As the above polyhydric alcohol, the ratio of the number of hydroxyl groups to the number of carbon atoms in the molecule [(number of hydroxyl groups) / (number of carbon atoms)]
Is preferably 0.2 to 2, and more preferably [(the number of hydroxyl groups) / (the number of carbon atoms)] as represented by pentaerythritols, sorbitol, mannitol and the like is 0.7 to 1 .5. Above all, pentaerythritols are most preferred because of their high hydroxyl group content and high carbonization promoting effect.

Polyhydric alcohols having a ratio of the number of hydroxyl groups to the number of carbon atoms in the molecule [(the number of hydroxyl groups) / (the number of carbon atoms)] in the range of 0.2 to 2 can be effectively dehydrated and condensed during combustion to effectively decompose. Form a carbonized layer. The above ratio [(number of hydroxyl groups) / (number of carbon atoms)]
However, if it is less than 0.2, the decomposition of carbon chains is more likely to occur at the time of combustion than dehydration condensation, so that it is not possible to form a sufficient carbonized layer. , Water resistance is greatly reduced. When the water resistance decreases, the polyhydric alcohol is eluted when the resin composition immediately after molding is cooled with water, or there is a problem that the polyhydric alcohol bleeds out due to humidity during storage of the molded article. .

In the present invention, preferred resin compositions used for the adiabatic expansion sheet include the resin compositions (1) to (5) described below.

The resin composition (1) comprises the thermoplastic resin and / or rubber substance, a phosphorus compound, a neutralized heat-expandable graphite, and an inorganic filler. The amount of the heat-expandable graphite added is 2 in total with respect to 100 parts by weight of the thermoplastic resin and / or rubber substance.
The weight ratio of the neutralized heat-expandable graphite to the phosphorus compound [(neutralized heat-expandable graphite) / (phosphorus compound)] is preferably 0.01 to 9 parts by weight. preferable.

The amount of the inorganic filler is from 50 to 500 parts by weight per 100 parts by weight of the thermoplastic resin and / or rubber substance.
Parts by weight are preferred, and the weight ratio of the inorganic filler to the phosphorus compound [(inorganic filler) / (phosphorus compound)] is 0.6 to
1.5 is preferred.

As the inorganic filler in the resin composition (1), the above-mentioned hydrated inorganic material, alkali metal, alkaline earth metal, and metal carbonate of Group IIb metal of the periodic table are preferable, and more preferably, the hydrated inorganic material is used. And a metal carbonate.

In the resin composition (1), the heat-expandable graphite that has been neutralized expands by heating to form a heat-insulating layer, thereby preventing heat transmission. The inorganic filler then contributes to an increase in heat capacity, and the phosphorus compound has the shape-retaining ability of the expanded heat-insulating layer. The mixing ratio of the resin composition (1)
These functions are designed to be expressed in a well-balanced manner.

The resin composition (2) comprises the thermoplastic resin and / or rubber substance, a phosphorus compound, and a metal carbonate of an alkali metal, an alkaline earth metal, and a metal of Group IIb of the periodic table. And the total amount of the metal carbonate is preferably 50 to 900 parts by weight based on 100 parts by weight of the thermoplastic resin and / or rubber substance, and the weight ratio of the metal carbonate to the phosphorus compound [(metal carbonate) / ( (Phosphorus compound)] is preferably 0.6 to 1.5.

In the resin composition (2), the decarboxylation and deammonification reactions are promoted by the chemical reaction between the polyphosphoric acid and the carbonate generated from the phosphorus compound when heated. The phosphorus compound generates polyphosphoric acid and also acts as a binder for the foam film, and the metal carbonate plays an aggregate role.

The above-mentioned resin composition (3) contains the above-mentioned thermoplastic resin and / or rubber substance, phosphorus compound, hydrated inorganic substance and / or
Or a calcium salt, and a metal carbonate of an alkali metal, an alkaline earth metal and a metal of Group IIb of the Periodic Table,
The total amount of the phosphorus compound, the metal carbonate, and the hydrated inorganic substance and / or the calcium salt is preferably 50 to 900 parts by weight based on 100 parts by weight of the thermoplastic resin and / or the rubber substance. The weight ratio of the total amount of the hydrated inorganic substance and / or the calcium salt [(the total amount of the metal carbonate and the hydrated inorganic substance and / or the calcium salt) / (the phosphorus compound)] is preferably 0.6 to 1.5.
The total amount of the hydrous inorganic substance and / or calcium salt is preferably 1 to 70 parts by weight based on 100 parts by weight of the metal carbonate.

Examples of the calcium salt include calcium sulfate, gypsum, calcium diphosphate and the like.

In the resin composition (3), the decarboxylation and deammonification reactions are promoted by the chemical reaction between the polyphosphoric acid and the carbonate generated from the phosphorus compound when heated. The phosphorus compound generates polyphosphoric acid and also acts as a binder for the foam film, and the metal carbonate plays an aggregate role. It is thought that the hydrated inorganic substance and / or calcium salt plays an aggregate role similarly to the metal carbonate.

The resin composition (4) comprises the thermoplastic resin and / or rubber substance, a phosphorus compound, a polyhydric alcohol,
And alkali metals, alkaline earth metals and the periodic table
It is composed of a metal carbonate of a Group IIb metal, and the total amount of the phosphorus compound, polyhydric alcohol and metal carbonate is 50 to 900 with respect to 100 parts by weight of the thermoplastic resin and / or rubber substance.
The weight ratio between the polyhydric alcohol and the phosphorus compound [(polyhydric alcohol) / (phosphorus compound)] is preferably 0.05 to 20. The weight ratio of the metal carbonate to the phosphorus compound [(metal carbonate) / (phosphorus compound)] is preferably 0.01 to 50.

In the above resin composition (4), by combining a phosphorus compound, a polyhydric alcohol and a metal carbonate, the resin composition has sufficient heat resistance, has a strong residue after combustion, and retains its shape. It is intended. Further, by heating, the phosphorus compound dehydrates and foams, and acts as a carbonization catalyst. The polyhydric alcohol forms a carbonized layer by the catalytic action of the phosphorus compound, and forms a heat insulating layer having excellent shape retention. The metal carbonate acts as an aggregate and makes the carbonized layer more robust.

The resin composition (5) comprises the thermoplastic resin and / or rubber substance, a phosphorus compound, a neutralized heat-expandable graphite, a polyhydric alcohol, an alkali metal,
The total amount of the phosphorus compound, the neutralized heat-expandable graphite, the polyhydric alcohol and the metal carbonate, which is composed of an alkaline earth metal and a metal carbonate of a Group IIb metal of the periodic table, is a thermoplastic resin and / or 50 to 50 parts by weight of rubber substance
900 parts by weight are preferred.

The weight ratio of the polyhydric alcohol to the phosphorus compound [(polyhydric alcohol) / (phosphorus compound)] is 0.05
-20, the weight ratio of the neutralized heat-expandable graphite to the phosphorus compound [(neutralized heat-expandable graphite) / (phosphorus compound)] is 0.01 to 9, The weight ratio [(metal carbonate) / (phosphorus compound)] to the phosphorus compound is preferably 0.01 to 50.

In the above resin composition (5), the phosphorus compound is dehydrated and foamed by heating, and acts as a carbonization catalyst. The polyhydric alcohol forms a carbonized layer by the catalytic action of the phosphorus compound, and forms a heat insulating layer having excellent shape retention. The metal carbonate acts as an aggregate and makes the carbonized layer more robust. The neutralized heat-expandable graphite expands at that time to form a heat-insulating layer, and acts more effectively to prevent heat transfer.

It is preferable that the adiabatic expansion sheet has an adhesive property. Having tackiness means having a property that enables temporary fixing to a sheet made of the non-combustible material, and broadly means having tackiness and / or adhesiveness. When the adiabatic expansion sheet has tackiness and / or tackiness, it can be easily adhered to a sheet made of a steel frame or a non-combustible material, and workability at the time of a fire-resistant coating work on the steel frame is improved.

In order to impart tackiness to the adiabatic expansion sheet, for example, a tackifier may be added to the thermoplastic resin and / or rubber substance. The tackifier is not particularly limited, and includes, for example, tackifier resins, plasticizers, fats and oils, low-polymerized polymers, and the like.

In the present invention, a flame retardant, an antioxidant, a metal harm inhibitor, an antistatic agent, a stabilizer, and the like are added to the resin composition constituting the adiabatic expansion sheet as long as the physical properties of the resin composition are not impaired. Crosslinking agents, lubricants, softeners, pigments and the like may be added.

The above resin composition can be obtained by melt-kneading the above-mentioned components using a conventionally known kneading apparatus such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneader mixer, and a two-roll machine. . The obtained resin composition can be formed into the adiabatic expanded sheet by a conventionally known molding method such as press molding, extrusion molding, and calendar molding.

For example, the heat-insulating expansion sheet forms a fire-resistant heat-insulating layer by expanding upon receiving heat in a fire.
The heat-insulating layer prevents heat from being transmitted to the steel frame. Therefore, it is preferable that this refractory heat-insulating layer is formed without gaps all around the steel frame. Further, as the sheet made of the non-combustible material, a material which can be deformed to some extent following the refractory heat-insulating layer formed by expansion of the heat-insulating inflatable sheet and retain the shape of the refractory heat-insulating layer is preferable.

The thickness of the adiabatic expansion sheet is 0.2 to 1
0 mm is preferred. If the thickness is less than 0.2 mm, sufficient heat insulating properties will not be exhibited even if expanded, and if it exceeds 10 mm, not only the degree of freedom of construction will decrease, but also the weight will increase and the handleability will deteriorate. More preferably, it is 1 to 6 mm.

The above-mentioned adiabatic inflatable sheet is initially
The bulk density of the season is 0.8-2 g / cm ^ThreeWhat is preferred
And more preferably 1 to 1.8 g / cm^ThreeIt is.
Initial bulk density at 25 ° C. of 0.8 to 2 g / cm^ThreeRange of
By enclosing the area,
Without impairing the physical properties such as heat insulation and fire resistance.
Excellent in properties.

When the initial bulk density at 25 ° C. of the adiabatic expanded sheet is less than 0.8 g / cm ³ , a sufficient amount of an expanding agent, a carbonizing agent, a nonflammable filler and the like are added to the resin composition. Therefore, the expansion ratio after heating and the amount of residue become insufficient, and a sufficient refractory heat-insulating layer cannot be formed. If the initial bulk density at 25 ° C. exceeds 2 g / cm ³ , the weight of the adiabatic inflatable sheet becomes too large, so that the workability in attaching a large-area adiabatic inflatable sheet and the like deteriorates.

The adiabatic expansion sheet has a bulk density of 0.05 to 0.5 g / cm ³ when heated at 500 ° C. for 1 hour.
Is more preferable, and more preferably 0.1 to 0.1.
3 g / cm ³ . If the bulk density at the time of heating at 500 ° C. for 1 hour is less than 0.05 g / cm ³ , there are too many gaps, and the fireproof heat insulating layer cannot be formed as a layer due to collapse during expansion. If it exceeds 5 g / cm ³ , the expansion ratio becomes insufficient, fire resistance cannot be sufficiently exhibited, and a fire-resistant heat-insulating layer cannot be formed.

The adiabatic expansion sheet is 50 kW / cm ^2.
It is preferable that the thermal conductivity after volume expansion for 30 minutes under the heating condition of 0.01 to 0.3 kcal / m · h · ° C. The thermal conductivity after volume expansion for 30 minutes under the heating condition of 50 kW / cm ² is 0.3 kcal / m ·
If the temperature exceeds h.degree. C., sufficient heat resistance cannot be exhibited due to insufficient heat insulating performance, and 0.01 kcal /
Those having a temperature lower than m · h · ° C. cannot be produced by a mixture of an organic substance and an inorganic substance.

The adiabatic expanded sheet has a total endotherm of 100 J / g when heated to 600 ° C. at a rate of 10 ° C./min, measured by a differential scanning calorimeter (DSC).
It is preferable that it is above. When the total heat absorption is 100 J / g or more, the temperature rise becomes slow, so that the heat insulating performance becomes better.

A woven fabric, a nonwoven fabric, a resin film or the like may be laminated on the adiabatic expansion sheet for the purpose of improving workability.

In the present invention, the H-shaped steel is formed by a laminate of a sheet made of the above-mentioned nonflammable material and the above-mentioned adiabatic expanded sheet.
The heat insulating material is coated according to the length of the H-shaped steel flange portion, and the heat-insulating material is disposed between the heat-insulating expansion sheet and the H-shaped steel flange portion and in the hollow portion formed by the laminate and the H-shaped steel.

It is preferable that an expansion absorption allowance in which the sheet made of the noncombustible material is folded is provided at the corner where the sheet made of the noncombustible material is folded. Due to such expansion absorption allowance, when the refractory heat-insulating layer is formed with the heat expansion of the adiabatic expansion sheet, the sheet made of the non-combustible material is deformed outward, so that it is uniform without deformation or destruction. A fire-resistant heat-insulating layer having a thickness is formed, and heat insulating performance can be effectively exhibited.

The thickness of the laminate is preferably 0.3 to 11 mm. Since the fire-resistant structure of the present invention is covered with the adiabatic expansion sheet, it expands in the event of a fire even if the thickness at the time of construction is small, thereby exhibiting excellent fire resistance. With such a configuration, higher fire resistance can be provided while maintaining the degree of freedom of workability.

[0068]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fire-resistant steel frame covering according to an embodiment of the present invention.

FIG. 1 is a cross-sectional view schematically showing a first embodiment of a refractory steel frame covering according to the present invention. FIG. 2 is a sectional view schematically showing a second embodiment of the refractory steel frame covering of the present invention. The refractory steel frame covering is usually
And 2 are installed such that the vertical direction is the indoor side.

In FIG. 1, a sheet A made of a non-combustible material is used for the entire circumference of the H-section steel 1 so that the H-section steel 1 has flange portions 2 and
A sheet B made of an adiabatic inflatable material is disposed inside the sheet A so as to cover the length of the sheet 2 '. Further, two hollow portions 5, 5 'formed between the sheet B and the H-shaped steel 1 flange portions 2, 2', and between the H-shaped steel 1 flange portions 2, 2 'and the H-shaped steel 1 web portion 4. Inside, a heat insulating material C is arranged.

Further, as shown in FIG. 1, the laminate of the sheet A and the sheet B is formed into unit members 10, 10 'having an L-shaped cross section, and the two unit members 10, 10' are formed. To hold the H-shaped steel 1 from outside.

At the corners formed by bending the unit members 10, 10 ', expansion absorption margins 6, 6' are provided, which are folded so that the sheet A protrudes outward. It is preferable that the expansion absorption allowances 6, 6 'are provided so as to protrude in the left-right direction in FIG. The expansion absorption allowances 6 and 6 ′ may be formed by folding the sheet A once, or may be formed by folding the sheet A two or more times.

The unit members 10 and 10 'are provided with connection flanges 7, 7' and connection flanges 8, 8 'at both ends.

When installing the unit members 10 and 10 ', first, as shown in FIG. 1, the outer surfaces of the flange portions 2 and 2' of the H-section steel 1 and the two hollow portions 5 and 5 'are thermally insulated. Material C is placed. As a method of disposing the heat insulating material C, as shown in FIG. 1, the flange portions 2 and 2 ′ are disposed so as to cover the entire outer surface thereof, and the two hollow portions 5 and 5 ′ are disposed so as to cover the flange portions 2 and 2 ′. It is preferable to arrange so as to have a U-shaped cross section so as to cover the entire inner surface and the opening.

When applying the refractory steel frame of the present invention, first, a heat insulating material C is disposed on the outer surfaces of the flange portions 2 and 2 ′ of the H-section steel 1 and the two hollow portions 5 and 5 ′. Then
After covering the H-shaped steel 1 by mounting the two unit members 10 and 10 ′ so as to hold them from the outside of the H-shaped steel 1,
The flanges 7, 8 provided at both ends of the unit members 10 and 10 'are fixed together, and the flanges 7', 8 'are fixed together. For connection of the flanges, for example, bolts, rivets,
A conventionally known method such as caulking is used.

As shown in FIG. 2, the expansion absorption allowance is
The whole of the laminate may be folded and provided at a corner of the laminate of the sheet A and the sheet B. Expansion absorption 1
6, 16 ′ may be formed by one folding, or may be formed by two or more folding.

When the refractory steel frame shown in FIG. 2 is applied, it is performed in the same order as in FIG. First, the heat insulating material C is disposed on the outer surfaces of the flange portions 12 and 12 ′ of the H-section steel 11 and the two hollow portions 15 and 15 ′. Next, after mounting the two unit members 20 and 20 ′ so as to hold the H-shaped steel 11 from outside the H-shaped steel 11,
The flanges 17, 18 provided at both ends of the unit members 20 and 20 'and the 17', 18 'are fixed.

When a column is attached to the above-mentioned fire-resistant steel frame covering, as shown in the schematic sectional view of FIG. 5, the connecting flange of the fire-resistant steel frame covering is fixed with a nail, a screw or the like. Secure to the back of the shape. On the pillar side of the refractory steel frame covering, the thick heat insulating material C is arranged in the concave portion of the H-shaped steel, so that it does not protrude indoors, and does not protrude the pillar shape indoors, and is flush with the inner wall. Can be maintained.

Example 1 According to the resin composition shown in Table 1, kneading and extrusion were performed with a twin screw extruder to obtain a sheet B made of an adiabatic expanded material. Then, as shown in FIG.
The sheet B was laminated on a zinc iron plate (sheet A made of a noncombustible material) having the thickness shown in Table 1 to obtain laminates 10 and 10 '. The laminates 10 and 10 'were bent so as to have an L-shaped cross section, and connection flanges 7, 7', 8, and 8 'were provided at both ends of the zinc iron plate. Further, as shown in FIG. 1, heat-insulating materials having the materials, thicknesses, and densities shown in Table 1 are provided on the outer surfaces of the flange portions 2, 2 'and the hollow portions 5, 5' of the H-section steel 1 (300 × 300 × 1200 mm). After arranging the C, the two laminated bodies 10, 10 'processed into the above-mentioned L-section are placed around the H-shaped steel 1, and the connecting flanges are fastened together with bolts to form an entire circumference of the H-shaped steel 1. Coating yielded a refractory steel frame coating. In addition, the bent part of the zinc-iron plate was protruded in the left-right direction to provide the expansion absorption allowances 6, 6 '.

Example 2 According to the resin composition shown in Table 1, kneading and extrusion were carried out with a twin-screw extruder to obtain a sheet B made of an adiabatic expanded material. Then, as shown in FIG.
The sheet B was laminated on a zinc iron plate (sheet A made of a noncombustible material) having the thickness shown in Table 1 to obtain laminates 20 and 20 ′. This laminate is bent so as to have an L-shaped cross section,
Connection flanges 17 and 1 at both ends of zinc iron plate
Except that 7 ', 18, and 18' were provided, the entire periphery of the H-section steel was covered in the same manner as in Example 1 to obtain a fire-resistant steel frame covering. The bent portions of the laminate were projected in the left-right direction to provide expansion allowances 16 and 16 '.

Example 3 According to the resin composition shown in Table 1, kneading and extrusion were carried out with a twin-screw extruder to obtain a sheet B made of an adiabatic expanded material. Then, as shown in FIG.
The sheet B was laminated on a zinc iron plate (sheet A made of a noncombustible material) having the thickness shown in Table 1 to obtain a laminate. This laminate is bent so as to have an L-shaped cross section, and connection flanges 21, 21 ', 22, 2 are formed on both ends of a zinc iron plate, respectively.
2 'was provided. Further, as shown in FIG.
4 (300 x 300 x 1200 mm) flange 2
After placing the heat insulating material C having the material, thickness and density shown in Table 1 on the outer surface of the 3, 23 'and the hollow portions 25, 25', the two laminates processed into the L-shaped cross section are placed around the H-section steel. Installed, connecting flanges 21 and 22 and 21 ', 22'
The whole circumference of the H-shaped steel 24 was covered by fastening together with bolts to obtain a fire-resistant steel frame covering.

Example 4 According to the resin composition shown in Table 1, kneading and extrusion were carried out with a twin-screw extruder to obtain a sheet B made of an adiabatic expanded material. Then, as shown in FIG.
A zinc iron plate (sheet A made of a non-combustible material) having the thickness shown in Table 1 was bent so as to have a U-shaped cross section, and the above-mentioned sheet B was laminated on one central side to obtain a laminate. Both ends of the zinc iron plate of the two laminates were bent to provide connection flanges 26, 26 ', 27, 27', respectively. Further, as shown in FIG. 4, the H-shaped steel 29 (300 × 300
(* 1200 mm) flanges 28, 28 'and heat-insulating materials C having the thickness, density and density shown in Table 1 on the outer surfaces and the openings, and then processing the two laminates processed into the above-described L-shape into H
The H-shaped steel 29 was installed around the shape steel 29, and the connection flanges 26, 27 and 26 ', 27' were fastened with bolts to cover the entire circumference of the H-shaped steel 29 to obtain a fire-resistant steel frame covering.

The above-mentioned fire-resistant steel frame covering was subjected to JIS A13
A fire resistance test in accordance with the standard No. 04 was carried out, and the surface temperature of the steel frame at this time was measured.

[0084]

[Table 1]

[0085]

The fire-resistant steel frame covering of the present invention has the above-mentioned structure, and is excellent in workability and can be constructed so as to be flush with the indoor side wall surface, so that the floor plan can be effectively utilized. Furthermore, since the refractory heat insulating layer formed at the time of heating is maintained without being destroyed, the refractory performance is excellent.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a first embodiment of a refractory steel frame covering according to the present invention.

FIG. 2 is a sectional view schematically showing a second embodiment of the refractory steel frame covering of the present invention.

FIG. 3 is a cross-sectional view schematically showing a third embodiment of the refractory steel frame covering of the present invention.

FIG. 4 is a sectional view schematically showing a fourth embodiment of the fire-resistant steel frame covering of the present invention.

FIG. 5 is a cross-sectional view schematically showing an example of the accommodation of the fire-resistant steel frame covering of the present invention.

FIG. 6 is a cross-sectional view schematically showing an example of the accommodation of a conventional fireproof covering material.

[Explanation of symbols]

A Sheet made of noncombustible material B Sheet made of adiabatic expansion material C Heat insulating material 1,11,24,29 H-section steel 2,2 ', 12,12', 23,23 ', 28,28'
Flange part 4,14,24,29 Web part 5,5 ', 15,15', 25,25 ', 30,30'
Hollow portion 6,6 ', 16,16' Expansion absorption 7,8,7 ', 8', 17,18 17 ', 18' Connection flange 21,22,21 ', 22' Connection flange 10,10 ', 20, 20' laminate

Claims (4)

[Claims] 1. The periphery of an H-shaped steel is covered with a laminate of a sheet made of a noncombustible material and a sheet made of an adiabatic inflatable material according to the length of the H-shaped steel flange, and the laminate and the H-shaped steel flange are covered. And a heat-insulating material disposed in a hollow portion formed by the laminate and the H-shaped steel. 2. The material according to claim 1, wherein the adiabatic expansion material is made of a material having a property of expanding when heated.
The refractory steel frame covering according to the above. 3. The fire-resistant steel frame covering according to claim 2, wherein the adiabatic expansion material comprises a resin composition containing a thermoplastic resin and / or a rubber substance, a phosphorus compound and an inorganic filler. 4. The sheet according to claim 1, wherein the sheet made of the non-combustible material is folded at a corner and extends in the width direction of the H-section steel. Refractory steel frame cladding.