JP2002081147A - Synthetic fire resistant covering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic fire resistant covering method capable of sufficiently realizing the fire resisting performance even though a gap is created by tremble during an earthquake in a gap of joint between a fire resistant covering member and a fire resistant partition wall. SOLUTION: When applying a fire resistant covering to a joint and a metal beam 1 of a fire-resistant partition wall 3 connected to the lower portion of a metal beam 1 supporting a floor slab 4, laminated bodies 5 of a thermally expansive material layer 7 and a metal plate 8 are installed to the exposed portions 1a and 1a at the connecting side of the fire resistant partition wall 3 of the metal beam 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a synthetic refractory coating method.

[0002]

2. Description of the Related Art Conventionally, as a fire-resistant coating method for disposing a fire-resistant partition wall below a metal beam (for example, H steel) supporting a floor slab, for example, as shown in a schematic sectional view of FIG. A fire-resistant coating material 12 (for example, a calcium silicate plate) is coated on three sides other than the floor slab 14 contact surface of the steel 11, and a fire-resistant partition wall 13 is brought into contact with the fire-resistant coating material 12 coated on the lower portion of the H steel 11 to be suspended. (Hereinafter referred to as single coating). As the fire-resistant partition wall 13, for example, a hollow steel-frame partition wall (fire-resistant (through) W1002) in which a fiber-containing calcium silicate plate is mounted on both sides is used.

[0003] With the revision of the Building Standards Law implemented in June this year, as shown in FIG.
Is installed so as to cover the upper end of the fire-resistant partition wall 13, there is no need to dispose the fire-resistant coating material 12 on the lower surface of the H steel 11, and the fire-resistant partition wall 13 is directly provided below the H steel 11.
Method of hanging and integrating (referred to as synthetic refractory coating method)
Has been recognized.

[0004] In the above synthetic refractory coating method, H steel 11
When connecting the refractory partition wall 13 having a smaller thickness than the flange width of the H steel 11, for example, as shown in FIG. (Calcium silicate plate) has been used. The refractory coating material 12 is fixed around the H steel 11 by screwing, and the refractory coating material 12 coated on the lower surface side of the H steel 11 is fixed by nailing using a metal fixing jig 15 having an L-shaped cross section. Is done.

[0005] However, in the above-mentioned synthetic fire-resistant coating method, a gap is formed at the connection between the fire-resistant coating material 12 and the fire-resistant partition wall 13 due to shaking such as an earthquake,
In the event that damage occurs, the fire resistance of a fire deteriorates. Further, in the synthetic refractory coating method shown in FIG. 8, a special fixing jig 15 had to be used.

[0006]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a structure in which a gap is formed at a connection portion between a refractory coating and a refractory partition wall due to shaking such as an earthquake, or the refractory coating is damaged. Even in some cases, it is an object of the present invention to provide a synthetic fire-resistant coating method capable of exhibiting sufficient fire resistance performance.

[0007]

According to a first aspect of the present invention, there is provided a synthetic fire-resistant coating method for applying a fire-resistant coating to a connection portion of a fire-resistant partition wall connected to a lower portion of a metal beam supporting a floor slab and a metal beam. Attach the refractory coating material to both sides of the metal beam, and further apply the laminated body of the heat-expandable material layer and the metal plate to the exposed portion of the metal beam at the connection side of the fire-resistant partition wall. It is characterized in that it is mounted as the inside.

According to a second aspect of the present invention, there is provided a composite fire-resistant coating method comprising the steps of: applying a fire-resistant coating to a connection between a metal column and a fire-resistant partition wall connected to the side surface of the metal column; A fireproof covering material is attached to the partition wall non-connection side, and a laminated body of a heat-expandable material layer and a metal plate is further exposed to the exposed portion of the metal pillar at the fire-resistant partition wall connection side, with the heat-expandable material layer side inside. It is characterized by being worn.

Hereinafter, the present invention will be described in detail. The fireproof coating method according to claim 1 is a fireproof coating method applied to a connection part of a fireproof partition wall connected to a lower part of a metal beam supporting a floor slab and a metal beam, and the longitudinal section shown in FIG. This will be described with reference to the plan views. In the figure, 1 is a metal beam (H steel or the like) supporting the floor slab 4, 2 is a refractory coating material, 3
Indicates fire-resistant partition walls.

A fire-resistant partition wall 3 is provided below the metal beam 1.
To cover both sides (between the upper and lower flanges) of the metal beam 1 with the refractory coating materials 2 and 2. Further, heat is applied to the exposed portions 1a and 1a of the metal beam 1 on the connection side of the refractory partition wall 3. The laminate 5 of the expandable material layer 7 and the metal plate 8 is
Install each with the side inside. As a method of connecting the refractory partition wall 3 to a lower portion of the metal beam 1, a conventionally known method is used.

The method of coating the refractory coating 2 on the metal beam 1 is performed by a conventionally known fixing method (for example, screwing, nailing, etc.), and the refractory coating 2 is applied to the metal beam 1 in the longitudinal direction. Along the entire surface. For example, an ALC panel is used as the fire-resistant partition wall 3, and a calcium silicate plate is used as the fire-resistant covering material 2, for example.

As shown in FIG. 1, the laminated body 5 is preferably formed by bending both ends of a metal plate 8 in advance and forming the cross-sectional shape into a substantially Z-shape. Such a molded body can be easily fixed to the fire-resistant covering material 2 and the fire-resistant partition wall 3 by screwing or nailing both ends of the metal plate 8 at the time of construction, and the workability can be improved. . As the metal plate 8, a steel plate, a copper plate, a galvanized steel plate, or the like is used.

Next, a synthetic fireproof coating method according to a second aspect of the present invention is a fireproof coating method applied to a connecting portion between a fireproof partition wall connected to a side surface of a metal pillar and a metal pillar and a metal pillar. This will be described with reference to the schematic cross-sectional view shown in FIG. In the figure, 7 is a metal column (such as a square pipe), 2 is a refractory coating material, and 3 is a refractory partition wall.

A fire-resistant partition wall 3 is provided on the side surface of the metal pillar 6.
Are connected to the non-fire-resistant partition walls 3 of the metal columns 6 with the refractory coating materials 2 and 2, and the exposed portions 6a, 6a, 6a, 6a of the metal columns 6 on the connection side of the fire-resistant partition walls 3 are connected.
The laminated body 5 of the heat-expandable material layer 7 and the metal plate 8 is mounted on the heat-expandable material layer 7 side. As a method for connecting the refractory partition wall 3 to the side surface of the metal pillar 6, a conventionally known method is used.

The method of coating the refractory coating material 2 on the metal column 6 is performed by a conventionally known fixing method (for example, screwing, nailing, etc.), and the refractory coating material 2 is coated in the longitudinal direction of the metal column 6. Along the entire surface. For example, an ALC panel is used as the fire-resistant partition wall 3, and a calcium silicate plate is used as the fire-resistant covering material 2, for example.

As shown in FIG. 2, the laminated body 5 is preferably formed by bending both ends of a metal plate 8 in advance and forming the cross-sectional shape into a substantially Z-shape. Such a molded body can be easily fixed to the fire-resistant covering material 2 and the fire-resistant partition wall 3 by screwing or nailing both ends of the metal plate 8 at the time of construction, and the workability can be improved. . As the metal plate 8, a steel plate, a copper plate, a galvanized steel plate, or the like is used.

In the present invention, the heat-expandable material layer comprises:
For example, it is used for the purpose of preventing a metal beam or a pillar from being exposed to a flame and becoming high temperature by heating and expanding at a high temperature such as a fire to form a refractory heat insulating layer (not shown) and shut off the flame. In addition, the metal layer blocks the flame and expands with the thermal expansion of the heat-expandable material layer to hold the refractory heat-insulating layer, thereby preventing the refractory heat-insulating layer from breaking or falling off.

In the present invention, an auxiliary heat insulating material made of an inorganic material may be further laminated on the side of the heat-expandable material layer of the laminate in order to enhance the fire resistance. Examples of the auxiliary heat insulating material include gypsum board, slate board, and ALC
A board, a PC board, a calcium silicate board, a wood chip cement board and the like are used. It is preferable to use a self-adhesive material as the above-mentioned heat-expandable material layer, since the lamination with a metal plate or an auxiliary heat insulating material becomes easy.

The above-mentioned heat-expandable material can be used without limitation as long as it forms a fire-resistant and heat-insulating layer when exposed to a high temperature such as a fire and exhibits fire-resistant performance. It is preferably made of a resin composition containing a rubber substance, neutralized heat-expandable graphite and an inorganic filler.

The thermoplastic resin and / or rubber material is not particularly limited, and may be, for example, a polypropylene resin,
Polyolefin resins such as polyethylene resins, poly (1-) butene resins and polypentene resins; polystyrene resins, acrylonitrile-butadiene-styrene resins, polycarbonate resins, polyphenylene ether resins, acrylic resins, polyamide resins , Polyvinyl chloride resin, phenolic resin, polyurethane resin, polybutene, polychloroprene, polybutadiene,
Examples thereof include polyisobutylene, butyl rubber, and nitrile rubber, which may be used alone or in combination of two or more.

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 the rubber substance may further include, as long as the fire resistance of the fire-resistant material is not impaired,
Crosslinking or modification may be performed. The thermoplastic resin and / or
Or, the method for crosslinking the rubber substance is not particularly limited,
Crosslinking methods commonly used for thermoplastic resins or rubber substances include, for example, a crosslinking method using various crosslinking agents and peroxides, and a crosslinking method using electron beam irradiation.

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

The heat-expandable graphite obtained by the acid treatment as described above is further neutralized by neutralizing with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound 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 hydrated inorganic substance and the metal carbonate function as an aggregate, it is considered that the hydrated inorganic substance and the metal carbonate contribute to the improvement of the strength and the heat capacity of the heating residue.

Further, the above-mentioned hydrated inorganic substance is endothermic due to water generated by a dehydration reaction at the time of heating, whereby 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.

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 below 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 particle size of the inorganic filler is 0.5 to
100 μm is preferable, and more preferably, about 1 to 50 μm.
m. In addition, 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 filling while maintaining the mechanical performance of the resin composition. Becomes

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.).

Commercially available calcium carbonates include, for example, "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 may optionally contain a phosphorus compound. 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, 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.

[0036]

Embedded image

In the formula, R ¹ and R ³ are hydrogen, carbon number 1 to
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 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. 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 to be mixed with the neutralized heat-expandable graphite is preferably 10 to 350 parts by weight based on 100 parts by weight of the thermoplastic resin and / or rubber substance. The compounding amount of the neutralized heat-expandable graphite is 10
If the amount is less than 10 parts by weight, sufficient thermal expansion property cannot be obtained and 3
If the amount exceeds 50 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 is preferably 50 to 500 parts by weight based on 100 parts by weight of the thermoplastic resin and / or the rubber substance. The amount is 50
If the amount is less than part 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.

If the amount of the phosphorus compound in the resin composition is too small, sufficient shape retention of the combustion residue cannot be obtained, and if the amount is too large, the mechanical properties are greatly reduced and the resin cannot be used. It is preferably 50 to 200 parts by weight based on 100 parts by weight of the resin and / or rubber substance. Further, the compounding amount (total amount) of the phosphorus compound, the neutralized heat-expandable graphite and the inorganic filler is preferably 200 to 600 parts by weight based on 100 parts by weight of the thermoplastic resin and / or rubber substance.

In the above resin composition, 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.

In the above resin composition, in addition to phenol-based, amine-based and sulfur-based antioxidants, metal harm inhibitors, antistatic agents, stabilizers and the like, as long as the physical properties of the thermally expandable material are not impaired. Crosslinking agents, lubricants, softeners, pigments and the like may be added.

As the heat-expandable material layer, a sheet-like material of this resin composition can be used. The resin composition is obtained by kneading each of the above components using a known kneading device such as a Banbury mixer, a kneader mixer, or a two-roll, and the resin composition is, for example, press-molded.
It is molded into a sheet by a conventionally known molding method such as extrusion molding or calender molding.

The heat-expandable material layer has an expansion ratio in the thickness direction when heated at 600 ° C. for 10 minutes (thickness d after expansion).
₁ / Thickness before expansion d ₀ ) is preferably 1.2 times or more, and bulk density after heat expansion is preferably 0.5 g / cm ³ or less. When the expansion ratio (d ₁ / d ₀ ) is less than 1.2 times or the bulk density exceeds 0.5 g / cm ³ ,
Insufficient heat insulation performance makes it impossible to provide sufficient fireproof heat insulation performance.

[0048]

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

Example 1 42 parts by weight of butyl rubber ("Butyl Rubber # 065" manufactured by Exxon Chemical Co., Ltd.), 50 parts by weight of polybutene ("Polybutene 100R" manufactured by Idemitsu Petrochemical Co., Ltd.), hydrogenated petroleum resin ("ESCOLETS" manufactured by Tonex Corporation) 5
320 ") 8 parts by weight, 150 parts by weight of neutralized thermally expandable graphite (" Frame Cut GREP-EG "manufactured by Tosoh Corporation) and 150 parts by weight of calcium carbonate (" Whiteton BF300 "manufactured by Bihoku Powder Co., Ltd.) Was melt-kneaded with two rolls, and then formed into a sheet having a thickness of 2 mm using a heating press to obtain a thermally expandable material layer. The laminate was fabricated by laminating a metal plate (0.3 mm thick steel plate) that had been bent and preformed into a substantially Z-shaped cross section.

Next, as shown in FIG.
H steel 1 (size: 400 x 200 x 8 x 13)
mm), connected to the fire-resistant partition wall 3 (16 mm thick fiber-containing calcium silicate plate double-sided hollow steel partition wall, fire-resistant (through) G1111), and then on both sides (between the upper and lower flanges) of the H steel 1. Fire-resistant coating material 2 made of calcium silicate board [fire-resistant (through) G1111] mixed with 16 mm thick fiber
Was coated. Further, the laminated body 5 of the heat-expandable material layer 7 and the metal plate 8 is placed inside the lower-side exposed portions 1a, 1a of the metal beam 1 on both sides of the upper end of the refractory partition wall 3 with the heat-expandable material layer 7 side inside. As a result, fireproof performance test specimens were prepared by nailing so that the gap with the fireproof partition wall 3 was 5 mm (assuming a gap due to an earthquake). The thermally expandable material layer 7 could be easily laminated by self-adhesion.

The fire resistance test specimens were tested for ISO 8
As a result of performing a fire resistance test in accordance with No. 34, the heat-expandable material layer expanded to form a fire-resistant heat-insulating layer and closed the gap. The average temperature of the H steel after heating for 1 hour was 350 ° C. or less, and the maximum temperature was 450 ° C. or less. In addition, ISO 8
In the fire resistance test of No. 34, it is required that the average temperature of the H steel after heating for 1 hour is 350 ° C. or less and the maximum temperature is 450 ° C. or less.

(Example 2) 42 parts by weight of butyl rubber ("butyl rubber # 065" manufactured by Exxon Chemical Co., Ltd.), 50 parts by weight of polybutene ("Polybutene 100R" manufactured by Idemitsu Petrochemical Co., Ltd.), and hydrogenated petroleum resin ("Escolets" manufactured by Tonex Corporation) 5
320 "), 8 parts by weight, neutralized heat-expandable graphite (30 parts by weight," Frame Cut GREP-EG "manufactured by Tosoh Corporation), 50 parts by weight of aluminum hydroxide (" Heidilite H-31 "manufactured by Bihoku Powder Chemical Co., Ltd.) Parts, 150 parts by weight of calcium carbonate (“Whiteton BF300” manufactured by Bihoku Powder Chemical Co., Ltd.) and ammonium polyphosphate (“EXOLI” manufactured by Clariant Co., Ltd.)
TAP422 ") After melt-kneading a resin composition consisting of 100 parts by weight with two rolls, 4 mm was heated with a heating press.
It was formed into a thick sheet to obtain a thermally expandable material layer.

As shown in FIG. 4, the heat-expandable material layer is laminated on a metal plate (thick steel plate having a thickness of 0.3 mm) which has both ends bent and preformed into a substantially Z-shaped cross section. A 12.5 mm thick gypsum board (auxiliary heat insulating material) 9 was laminated on the expandable material layer 7 side to produce a laminate 5. A fire resistance test specimen was produced in the same manner as in Example 1 except that the above-mentioned laminate was attached to the lower exposed portions 1a, 1a of the metal beam 1, respectively. The thermally expandable material layer 7 could be easily laminated by self-adhesion. As a result of performing a fire resistance test on the fire resistance test specimen in accordance with ISO 834, the heat-expandable material layer expanded to form a fire-resistant heat-insulating layer and closed the gap. The average temperature of the H steel after heating for 1 hour was 350 ° C. or less, and the maximum temperature was 450 ° C. or less.

(Example 3) A fire resistance test specimen was prepared in the same manner as in Example 1 except that the thickness of the heat-expandable material layer was changed to 1.5 mm. As a result of performing a fire resistance test on the fire resistance test specimen in accordance with ISO 834, the expanded refractory material expanded and closed the gap. The average temperature of the H steel after heating for 1 hour was 350 ° C. or less, and the maximum temperature was 450 ° C. or less.

(Comparative Example) As shown in FIG. 5, H steel 11 (size: 400 × 200 × 8) supporting the floor slab 14
× 13 mm), a fire-resistant partition wall 13 [16 mm
H steel 11 after connecting to a thick fiber-mixed calcium silicate plate double-sided hollow steel partition wall, fire resistant (through) G1111]
Was coated with a refractory coating material 2 made of a 16 mm thick fiber-containing calcium silicate plate (fire-resistant (through) G1111) on both sides (between the upper and lower flanges). Further, a 6 mm thick fiber-containing calcium silicate plate is attached to the lower surface side exposed portions 11a, 11a of the metal beam 11 by nailing so that the gap with the refractory partition wall 13 is 5 mm (assuming a gap due to an earthquake). Thus, a fire resistance test specimen was prepared. As a result of performing a fire resistance performance test on the fire resistance test specimen in accordance with ISO 834, the average temperature of the H steel after heating for 1 hour was 350 because the flame that entered through the gap was in direct contact with the H steel.
° C, and the maximum temperature also exceeded 450 ° C.

[0056]

The composite fire-resistant coating method of the present invention has the above-described structure, and a laminate of a heat-expandable material layer and a metal plate is provided on an exposed portion of a metal beam or column to which a fire-resistant partition wall is connected. By mounting the heat-expandable material layer side inside,
Even if there is a gap between the laminate and the fire-resistant partition wall due to an earthquake or the fire-resistant coating material is damaged, the heat-expandable material layer expands and closes the gap when heated, Expresses excellent fire resistance performance.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing an example of a synthetic refractory coating method of the present invention.

FIG. 2 is a schematic longitudinal sectional view showing another example of the synthetic refractory coating method of the present invention.

FIG. 3 is a schematic cross-sectional view showing a synthetic refractory coating method of Example 1.

FIG. 4 is a schematic cross-sectional view showing a synthetic refractory coating method of Example 2.

FIG. 5 is a schematic longitudinal sectional view showing a synthetic fireproof coating method of a comparative example.

FIG. 6 is a schematic longitudinal sectional view showing a conventional single coating method.

FIG. 7 is a schematic vertical sectional view showing a conventional synthetic coating method.

FIG. 8 is a schematic longitudinal sectional view showing a conventional synthetic coating method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1,11 Beam 2,12 Fireproof covering material 3,13 Fireproof partition wall 4,14 Floor slab 5,15 Laminated body 6 Column 7 Thermal expansion material layer 8 Metal plate 9 Auxiliary heat insulator 1a, 6a Exposed part

Claims (4)

[Claims] When a fireproof coating is applied to a connection portion of a refractory partition wall connected to a lower portion of a metal beam supporting a floor slab and a metal beam, a fireproof coating material is attached to both sides of the metal beam;
A composite fire-resistant coating method, further comprising: mounting a laminate of a heat-expandable material layer and a metal plate on an exposed portion of the metal beam on the fire-resistant partition wall connection side, with the heat-expandable material layer side inside. 2. A fireproof coating material is provided on the non-fireproof partition wall non-connection side of the metal pillar when the fireproof coating is applied to the connection between the metal pillar and the fireproof partition wall connected to the side surface of the metal pillar. Characterized in that a laminated body of a heat-expandable material layer and a metal plate is mounted on the exposed portion of the metal pillar at the connection side of the fire-resistant partition wall with the heat-expandable material layer side inside. Coating method. 3. The heat insulating material layer according to claim 1, wherein an auxiliary heat insulating material made of an inorganic material is further stacked on the heat expanding material layer side of the laminate of the heat expanding material layer and the metal plate. Synthetic refractory coating method. 4. The heat-expandable material layer comprises a thermoplastic resin and / or
The synthetic refractory coating method according to any one of claims 1 to 3, comprising a resin composition containing a rubber substance, neutralized heat-expandable graphite and an inorganic filler.