JP2008031802A - Fire resisting coating structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire resisting coating structure which is excellent in its shape retentivity even if it is exposed to a high temperature for a long period of time, and which can suppress the occurrence and progress of smoking. <P>SOLUTION: This fire resisting coating structure for coating a wooden structure body with a thermally-expansible fire resisting coating material is characterized as follows: the thermally-expansible fire resisting coating material consists of 55-85 wt.% inorganic fibers, a 5-30 wt.% thermally-expansible inorganic substance, a 5-25 wt.% inorganic binder, and a 5-15 wt.% organic binder; and the inorganic binder, which is contained in the thermally-expansible fire resisting coating material, is composed of a sinterable inorganic material with a melting point of 650-1,000°C. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fireproof covering structure for a wooden structure.

Conventionally, in the design of fireproof structures for wooden buildings such as houses, a so-called “burning allowance” has been established that “if there is a certain cross section of the wooden structure material, the surface layer will not carbonize by the heat insulation effect due to carbonization” The design is known.
The fireproof structure is sufficient even with a conventional wooden structure constructed with a cross-sectional area design with the conventional “burning allowance” added, or a double structure design in which the surface of the structure is further covered with wood. There was a case that I could not say.
Specifically, as observed in the spread of fire in a forest fire or the like, the problem is that a so-called “swelling” phenomenon occurs when carbonization proceeds in the main body of a wooden building during an actual fire.
As a fireproof coating structure that can suppress the occurrence and progression of such sag, a fireproof coating structure including a thermally expandable fireproof coating material containing a thermoplastic resin or the like has been proposed (Patent Document 1).

On the other hand, a wet slurry of a composition of 50 to 90% by weight of rock wool, 5 to 25% by weight of thermally expandable inorganic powder, 5 to 10% by weight of a sinterable inorganic material, and 2 to 10% by weight of an organic binder was wet-made. Thermally expandable inorganic fiber felts obtained in this way have been proposed so far.
The shape of the thermally expandable inorganic fiber felt changes greatly before and after receiving heat from a fire or the like. Therefore, even after the thermally expandable inorganic fiber felt expands due to heat from a fire or the like, the thermally expandable inorganic fiber felt does not easily collapse after the expansion. The sinterable inorganic material is an essential component.
This sinterable inorganic material is sintered and integrated with the rock wool by heat such as fire. By this sintering integration, it is possible to prevent the thermally expandable inorganic fiber felt after expansion from collapsing in a short time.
From this, it is said that the said thermally expansible inorganic fiber felt can be applied to a fireproof sealing material etc. (patent document 2).
JP 2003-293482 A JP 2000-199194 A

However, instead of the thermally expandable fireproof coating material containing the thermoplastic resin described above,
Problems have arisen when simply using the thermally expandable inorganic fiber felt.
That is, as in the case of the thermally expandable inorganic fiber felt, a sinterable inorganic material such as borax having a melting point of 75 ° C. or sepiolite having a melting point exceeding 1300 ° C. is used for the thermally expandable inorganic fiber felt. In such a case, the sinterable inorganic material and the inorganic fiber may be sintered and integrated before the heat-expandable inorganic material sufficiently expands due to heat from a fire or the like. Even after the material has sufficiently expanded, the sinterable inorganic material and the inorganic fiber may not be sufficiently sintered and integrated, and the shape retention when exposed to a high temperature for a long time is still insufficient. There was no problem.

An object of the present invention is to provide a fireproof coating structure that is excellent in shape retention even when exposed to high temperatures for a long period of time and can suppress the occurrence and progression of curling.

As a result of intensive studies to solve the above problems, the inventor has a melting point of 650 to 1000 ° C.
In order to complete the present invention, the present inventors have found that a fire-resistant coating structure including the following thermally expandable fire-resistant coating material including a sinterable inorganic material having a specific melting point within the range is suitable for the purpose of the present invention. It came.

That is, the present invention
[1] A structure in which a wooden structure body is covered with a thermally expandable fireproof covering material,
The thermally expandable fireproof coating material comprises 55 to 85% by weight of inorganic fibers, 5 to 30% by weight of thermally expandable inorganic material, 5 to 25% by weight of inorganic binder, and 5 to 15% by weight of organic binder,
The inorganic binder contained in the thermally expandable fireproof coating material has a melting point of 650 to 1000.
A fireproof coating structure characterized by comprising a sinterable inorganic material in the range of ° C.,
[2] The inorganic binder contained in the heat-expandable fireproof coating material is silicon dioxide 50 to
It consists of a sinterable inorganic material containing 60% by weight, aluminum oxide 10-20% by weight, calcium oxide 10-20% by weight, magnesium oxide 1-10% by weight and boron oxide 8-13% by weight. , Providing the fireproof coating structure according to the above [1],
[3] The fireproof material according to [1] or [2], wherein the thermally expandable fireproof covering material is fixed to the wooden structure body by at least one of an adhesive and a stopper. The construction method of a covering structure is provided.

ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where it is exposed to high temperature for a long time, it can provide the fireproof coating structure which is excellent in the shape retainability, and can suppress generation | occurrence | production and progress of a twist.

First, a first embodiment of the present invention will be described with reference to the drawings.
1 and 2 show a fireproof covering structure according to Embodiment 1 of the present invention. In addition, the same code | symbol is attached | subjected and demonstrated about the same or equivalent part as the said prior art example.
First, to explain from the configuration, the fireproof covering structure of the first embodiment is a construction example of a wooden structure main body, and a thermally expandable fireproof covering material around the wooden pillar 3 as the structure main body. 2
Is covered to form the refractory column material 1.

The wooden pillar 3 is made of 30 cm × 30 cm square wood, and the thermally expandable fireproof covering 2
Has a thickness in the range of 1.5 to 3 mm.

The said heat-expandable fireproof covering material 2 consists of an inorganic fiber, a heat-expandable inorganic substance, an inorganic binder, and an organic binder.
First, inorganic fibers used for the thermally expandable fireproof covering material will be described.
As an inorganic fiber used for this invention, a ceramic fiber etc. can be mentioned, for example.
Specific examples of such ceramic fibers include silica alumina fibers, alumina fibers, silica fibers, and zirconia fibers.
Such ceramic fibers preferably have a melting point of 1300 ° C. or higher from the viewpoint of heat resistance,
If it is 1500 degreeC or more, it is still more preferable.
In the present invention, the term “melting point” means the melting point of a substance that clearly shows the melting point, such as a pure substance, and the like for those that do not clearly show the melting point, such as a mixture.
It shall mean the softening point measured according to SR3103-1.

  The said inorganic fiber can use 1 type, or 2 or more types.

The amount of inorganic fiber used in the present invention is based on the weight of the thermally expandable fireproof coating material,
It is in the range of 55 to 85% by weight.
When the amount of the inorganic fiber is less than 55% by weight, the shape retention of the heat insulating layer is lowered, and when it is more than 85% by weight, the workability of the thermally expandable fire-resistant coating material is lowered.
The amount of the inorganic fiber used in the present invention is preferably in the range of 60 to 80% by weight.

The diameter of the inorganic fiber is usually in the range of 0.01 to 100 μm, preferably 0.1 to 100 μm.
The range is 30 μm. In addition, the inorganic fiber may be a bundle of a plurality of fibers combined with a sizing agent such as a silane coupling agent.

There is no limitation on the production method for obtaining the inorganic fiber, for example, a rod method for winding the fiber obtained by softening and drawing the inorganic fiber raw material, discharging the molten raw material from the nozzle, Examples include a pot method for winding the obtained fiber, a precursor polymer method for winding the fiber obtained by sintering the precursor of the raw material dissolved in an organic solvent as a precursor, and the like. Can do. Commercial products can be obtained as these inorganic fibers.

Examples of the inorganic fibers used in the present invention include those obtained by cutting linear ceramic fibers, and those obtained by pulverizing linear ceramic fibers.
What was obtained by cutting the above-mentioned linear ceramic fiber can be obtained as a chopped inorganic fiber, and a commercially available product obtained by pulverizing the above-mentioned linear ceramic fiber is commercially available as a milled inorganic fiber. Goods can be obtained.
These inorganic fibers can be used alone or in combination of two or more.

Next, the thermally expandable inorganic substance used in the present invention will be described.
The thermally expandable inorganic compound is not particularly limited as long as it expands when heated,
Examples thereof include vermiculite, kaolin, mica, and thermally expandable graphite. Among these, heat-expandable graphite is preferable because the foaming start temperature is low.

The heat-expandable graphite is a conventionally known substance, and powders such as natural scaly graphite, pyrolytic graphite, and quiche graphite are mixed with inorganic acids such as concentrated sulfuric acid, nitric acid, and selenic acid, concentrated nitric acid, perchloric acid, peroxygen, and the like. A graphite intercalation compound produced by treatment with a strong oxidant such as chlorate, permanganate, dichromate, hydrogen peroxide, etc., and is a crystalline compound that maintains the layered structure of carbon. .

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

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

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

The thermal expandable graphite preferably has a particle size in the range of 20 to 200 mesh. Granularity is 2
If it is smaller than 00 mesh, the degree of expansion of graphite is small and a sufficient fireproof heat insulating layer may not be obtained. On the other hand, if the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large. It may be difficult to hold the expandable fireproof coating.

As a commercial item of the said thermal expansion graphite by which the neutralization process was carried out, for example, UCAR CARBON
“GRAF GUARD” manufactured by the company, “GREP-EG” manufactured by Tosoh Corporation, and the like.

  The said thermally expansible inorganic substance can use 1 type, or 2 or more types.

The compounding quantity of the thermally expansible inorganic substance used for this invention is the range of 5-30 weight% on the basis of the weight of the said thermally expansible fireproof coating material used for this invention.
When the blending amount of the heat-expandable inorganic material is less than 5% by weight, the expansion volume after combustion is small, and a sufficient fireproof heat insulating layer cannot be obtained. On the other hand, when it exceeds 30% by weight, the strength of the thermally expandable fireproof coating material after expansion is lowered.
The amount of the thermally expandable inorganic material used in the present invention is preferably in the range of 10 to 25% by weight.

Next, the inorganic binder used in the present invention will be described.
As an inorganic binder used for this invention, a sinterable inorganic material etc. can be mentioned, for example.
Specific examples of the sinterable inorganic material include, for example, electrically insulating glass.

Specific examples of the electrically insulating glass include 50 to 60% by weight of silicon dioxide, 10 to 20% by weight of aluminum oxide, 10 to 20% by weight of calcium oxide, 1 to 10% by weight of magnesium oxide, and boron oxide. Can be mentioned what is called E glass and the like contained in the range of 8 to 13% by weight.

The sinterable inorganic material used in the present invention is preferable if the content of the lead metal salt and the alkali metal oxide is less than 1% by weight with respect to the weight of the sinterable inorganic material.
As the lead metal salts, for example, a _{PbO, PbO 2, Pb 3 O} 4 or the like.
Examples of the alkali metal oxide include Na ₂ O and K ₂ O.

Among the sinterable inorganic materials used in the present invention, the E glass is preferred because it has a low alkali metal oxide content and has little influence on fireproof doors made of fireproof / fireproof panels.

The sinterable inorganic material used in the present invention has a melting point in the range of 650 to 1000 ° C.
Thereby, even after the thermally expandable fireproof covering material used in the present invention is expanded by heat such as a fire, the inorganic fibers and the like contained in the thermally expandable fireproof covering material are kept in a unified and unitary shape. In addition to being able to do so, its shape retention is maintained even when exposed to high temperatures for long periods of time.
When the melting point is less than 650 ° C., because the heat-expandable fireproof coating material sufficiently expands due to heat such as fire, the sinterable inorganic material and the inorganic fiber are integrated by sintering, Inferior shape retention when exposed to high temperature for a long time. When the melting point exceeds 1000 ° C,
Even after the thermally expandable fire-resistant coating material has sufficiently expanded, the sinterable inorganic material and the inorganic fiber may not be sufficiently sintered and integrated, and similarly when exposed to high temperatures for a long time. Inferior shape retention.
The melting point is preferably 700 to 900 ° C, more preferably 750 to 850 ° C.

The sinterable inorganic material having a desired melting point can be obtained by adjusting the components contained in the sinterable inorganic material.
For example, in the case of the E glass, specifically, silicon dioxide is 55% by weight, aluminum oxide is 15% by weight, calcium oxide is 15% by weight, magnesium oxide is 5% by weight,
When boron oxide is contained at 10% by weight or the like, the melting point is 700 ° C.

By increasing the amount of calcium oxide, magnesium oxide and the like contained in the E glass, the ratio of covalent bonds such as silicon dioxide contained in the E glass can be reduced. Can be lowered to 700 ° C. or lower.

Conversely, by reducing the amount of calcium oxide, magnesium oxide, etc., the proportion of covalent bonds such as silicon dioxide contained in the E glass can be increased, so the melting point of the E glass is raised to 700 ° C. or higher. It becomes possible.

The compounding quantity of the sinterable inorganic material used for this invention is the range of 5-25 weight% on the basis of the weight of the said heat-expandable fireproof coating material used for this invention.
When the blending amount of the sinterable inorganic material is less than 5% by weight or exceeds 25% by weight, when the thermally expandable fire-resistant coating material is exposed to a high temperature for a long time, its shape retention is lowered. .
The amount of the sinterable inorganic material used in the present invention is preferably in the range of 10 to 15% by weight.

The shape of the sinterable inorganic material is not particularly limited, and examples thereof include a fiber-shaped body, a wool-shaped body in which the fiber-shaped body is intertwined, and a powder-shaped body.

  When a fiber shaped body is used as the sinterable inorganic material, the diameter of the fiber is usually in the range of 0.01 to 100 μm, preferably in the range of 0.1 to 30 μm. In this case, as the fiber shaped body, a plurality of fibers combined into one by a sizing agent such as a silane coupling agent can be used.

The method for obtaining such a fiber-shaped body is not particularly limited. For example, the rod method of winding the fiber obtained by softening and drawing the raw material of the sinterable inorganic material, the molten raw material Examples of the method include a pot method that discharges from the nozzle and winds up the obtained fiber. What was obtained by these methods can be obtained as a commercial item.

Moreover, when using a powder-shaped body as said sinterable inorganic material, the average particle diameter of the said powder-shaped body is the range of 5-500 micrometers normally. The powdery body can usually be obtained as a commercial product.

  The said sinterable inorganic material can use 1 type, or 2 or more types.

Next, the organic binder used in the present invention will be described.
The organic binder used in the present invention is not particularly limited. For example, specifically, polyolefin resins such as polypropylene resins, polyethylene resins, poly (1-) butene resins, polypentene resins, polystyrene resins, Acrylonitrile-butadiene-styrene resin, methyl methacrylate-butadiene-styrene resin, ethylene-vinyl acetate resin, ethylene-propylene resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, etc. Thermoplastic resins,
Natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR) ), Butyl rubber (IIR), ethylene-propylene rubber (EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (
ACM, ANM), epichlorohydrin rubber (CO, ECO), polyvulcanized rubber (T), silicone rubber (Q), fluoro rubber (FKM, FZ), rubbers such as urethane rubber (U),
Thermosetting resins such as polyurethane resin, polyisocyanate resin, polyisocyanurate resin, phenol resin, epoxy resin,
Latexes such as the above thermoplastic resins and rubbers,
Examples thereof include emulsions such as the above thermoplastic resins and rubbers.

Of these, rubber latexes, ethylene-vinyl acetate resins, acrylic resin emulsions, and the like are preferable from the viewpoint of handleability.

  The organic binder can be used alone or in combination of two or more.

The amount of the organic binder used in the present invention is in the range of 5 to 15% by weight based on the weight of the thermally expandable fireproof coating material used in the present invention.
When the blending amount of the organic binder is less than 5% by weight, workability for producing the heat-expandable fireproof coating material is lowered. On the other hand, when the content exceeds 15% by weight, the shape-retaining property is lowered when the thermally expandable fireproof coating material is exposed to a high temperature for a long time.
The amount of the organic binder used in the present invention is preferably in the range of 5 to 10% by weight.

In addition, for the thermally expandable fireproof coating material, the colorant, within a range not to impair the purpose of the present invention,
Various additives such as antioxidants, flame retardants, inorganic fillers, and pressure-sensitive adhesives can be used.

Next, a method for producing the thermally expandable fireproof covering material used in the present invention will be described.
The method for producing the thermally expandable fireproof coating material is not particularly limited. For example, each component of the thermally expandable fireproof coating material is formed into a plate shape or a sheet shape by a papermaking method, and the thermally expandable fireproof coating material. Examples of the method include forming a mixture of each component of the covering material and an organic solvent, and then removing the organic solvent to obtain a plate shape or a sheet shape.

Among these, from the viewpoint of producing the homogeneous heat-expandable fireproof coating material, a manufacturing method by a papermaking method is preferable, and among these manufacturing methods by the papermaking method, a manufacturing method by an adsorption molding method is more preferable.

As a manufacturing method of the said heat-expandable fireproof covering material by a typical papermaking method, the manufacturing method by the following process can be mentioned, for example.
(1) Disperse each component of the heat-expandable fireproof coating material used in the present invention described above in a solvent using an apparatus such as a mixer or a mill to prepare a solvent slurry of each component.
(2) The solvent slurry is made by a paper making machine such as a rot former and formed into a desired shape.
(3) If necessary, the solvent is removed from the solvent slurry by means such as suction, compression, centrifugation, heating, and air blowing.
Through the above steps, the thermally expandable fireproof coating material used in the present invention can be obtained.

Next, the manufacturing method of the said heat-expandable fireproof covering material by an adsorption molding method is demonstrated.
One embodiment of this adsorption molding method is exemplified as follows with reference to FIG.
(1) For example, a solvent that does not dissolve each component of the thermally expandable fireproof coating material is prepared,
A slurry 8 is prepared by suspending each component of the thermally expandable fireproof coating material in such a solvent.
(2) A frame body suction port 9 for sucking the slurry 8 and each component of the thermally expandable fireproof coating material are separated from the slurry 8 provided on one side of the frame body suction port 9. The slurry is sucked by an adsorption molding device 12 including a filtering member 10 for collecting the suction member 11 and a suction device 11 for recovering the solvent from the slurry 8 through the filtering member 10.
(3) For example, a partition for orienting inorganic fibers contained in the slurry 8 in one direction can be provided between the frame body inlet 9 of the adsorption molding device 12 and the filter member 10 ( Not shown). Since this partition is provided with one side of each partition sufficiently longer than the other side, the inorganic fibers 13 are sequentially deposited from the filtration member 10 side along the direction of the longer side in the suction molding apparatus 12. .
For convenience of explanation, in FIG. 1, the length of the inorganic fiber is drawn longer than the actual length.
The partition is pulled out from the frame body suction port 9 after the suction operation is completed or while performing the suction operation, so that a filtered material in which the inorganic fibers are substantially oriented in a certain direction is formed inside the adsorption molding device 12. .
(4) After suction, the solvent contained in the obtained filtrate is removed by means such as suction, compression, centrifugation, heating, and air blowing.
(5) Subsequently, it can be formed into a desired shape using means such as cutting.
Through the above steps, the thermally expandable fireproof coating material used in the present invention can be obtained.

As said filtration member, what has a filter paper, a filter cloth, a filter, a metal mesh etc. can be mentioned, for example.
The filtering member can be used alone or in combination of two or more.

By appropriately selecting the shape of the frame body inlet, the thermally expandable fire-resistant coating material having a desired shape can be obtained.

The solvent is preferably a solvent that does not dissolve the various components of the thermally expandable fireproof coating material, and examples thereof include water and methanol. Among these, from the viewpoint of handleability, the solvent is preferably water.

When the slurry is sucked by the above operation, the orientation direction of the inorganic fibers can be aligned in the suction direction, and the inorganic fibers contained in the thermally expandable fireproof coating material are disposed on the surface of the thermally expandable fireproof coating material. Can be substantially oriented in the direction normal to the.
When the inorganic fibers are substantially oriented in the normal direction to the surface of the thermally expandable fireproof coating material, the thermally expandable fireproof coating material is more thermally expanded than the thickness direction of the thermally expandable fireproof coating material. Greatly expands in the direction of the surface of the fireproof covering material.

As a result, even if there is an opening in a part of the thermally expandable fireproof covering material and a portion not covered by the thermally expandable fireproof covering material in a part of the wooden board or the like, these openings or covering An undisclosed portion can be closed by expansion based on heat such as a fire.

As a specific example of the method of forming a mixture with the organic solvent, for example, an organic solvent in which the organic binder is dissolved is mixed with inorganic fibers, a thermally expandable inorganic material, a sinterable inorganic material, and an organic binder. There is a method in which an organic solvent is removed after preparing a mixture and forming it into various shapes with a molding machine. The heat-expandable fireproof covering material can also be obtained by this method.

The heat-expandable fireproof coating material used in the present invention is preferably covered with one or more of a net made of a nonflammable fiber material, a sheet made of a nonflammable fiber material, and the like.
As a net made of such non-combustible fiber material, a sheet made of non-combustible fiber material, etc.
For example, those made of inorganic fiber or metal fiber material are preferable. Specifically, glass fiber woven fabric (glass cloth, continuous strand mat, etc.) or non-woven fabric (chopped strand mat, etc.), ceramic fiber woven fabric (Ceramic cloth etc.) or non-woven fabric (ceramic mat etc.), carbon fiber woven or non-woven fabric, net or sheet formed from lath or wire mesh is preferably used.

The weight per square meter of the net made of the noncombustible fibrous material is 25 to 20
00 g.
If the weight per square meter is less than 25 g, the effect of improving the shape retention of the expanded heat insulating layer may be reduced, and if it exceeds 2000 g, it may be difficult to insert into the epoxy resin composition. .

The thickness of the net made of the non-combustible fibrous material is preferably 4 mm or less.
When the thickness exceeds 4 mm, deformation such as bending may be difficult when constructing the fireproof sheet.

In the case of a net made of the non-combustible fibrous material, the opening is preferably 0.1 to 50 mm. If the opening is less than 0.1 mm, the installation workability may be reduced, and if it exceeds 50 mm, the effect of improving the shape retention of the expanded heat insulating layer may be reduced.

When the thickness of the net made of the non-combustible fibrous material is thinner than the thickness of the thermally expandable fireproof covering material, the position of the net or sheet is any position in the thickness direction of the thermally expandable fireproof covering material. Although it is good, it is preferable that it is the surface side exposed to a flame.

The heat-expandable fireproof coating material provided with a net made of the noncombustible fibrous material is obtained by molding integrally with the heat-expandable fireproof cover material and a net made of the noncombustible fibrous material. .

As illustrated in FIG. 1, a base material layer 4 may be laminated on one surface or both surfaces of the thermally expandable fire-resistant coating material for the purpose of improving workability and strength of combustion residues. .

Examples of the material used for the base material layer 4 include cloth, nonwoven fabric, craft paper, plastic film, split cloth, glass cloth, aluminum glass cloth, aluminum foil, aluminum steamed film, aluminum craft paper, and these. Examples include a laminate of materials. Preferably, it is a plastic film such as a polyethylene film, a polypropylene film or a polyester film, or an aluminum kraft paper or an aluminum glass cloth. Moreover, the thickness of the base material layer 4 is preferably 0.25 mm or less.

When the heat-expandable fire-resistant coating material is used for fire-proof applications, the heat-expandable fire-resistant coating material is adhered with an adhesive or the like so as to follow various woods, or a metal stopper such as a screw or a tucker. It is preferable to form the refractory column materials 1 and 11 by fixing them at 6 or using them together.
When fixing using a screw, it is preferable to fix using a washer together.

Moreover, when fixing using a tucker, since the fixing force with respect to a wooden pillar material of a tucker weakens by the carbonization progress of the wooden pillar material 3, it is desirable to use a thing with a long needle | hook or to fix by a staggering.

Moreover, when coating the said heat-expandable fireproof coating material, you may make a joint mutually and carry out multilayer coating in the meaning which supplements the joint part of the said heat-expandable fireproof coating materials.

For example, in the case of a rectangular structure, the lower layer is coated on the four sides with the plate-like thermally expandable fire-resistant coating material, and then the upper layer is coated with the L-shaped thermally expandable fire-resistant coating material, or There is a structure in which the upper layer and the lower layer are coated with two different types of L-shaped heat-expandable fireproof coating materials so as to be jointed with each other.

After the thermal expansion fire-resistant covering material is coated on the wooden structure body by the above method, the joint 7 is further protected. For example, a net made of a non-combustible fibrous material is formed on the joint 7 of the sheet. Or sheets, inorganic fibers or metallic fiber materials, for example, glass fiber woven fabric (glass cloth, continuous strand mat, etc.) or non-woven fabric (chopped strand mat, etc.), ceramic fiber woven fabric (ceramic cloth, etc.) ) Or non-woven fabric (ceramic mat or the like), carbon fiber woven or non-woven fabric, lath, or net or sheet formed from a metal mesh is preferably protected and fixed by a metal stopper such as tucker, an adhesive, or a combination thereof.

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

Further, after coating the thermally expandable refractory material made of the resin composition around the structural material main body 3 by casting, a net or sheet of the above material made of glass cloth or the like so as to cover the entire circumference. You may attach and install.

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

Next, the operation of the first embodiment will be described.
The present invention fundamentally eliminates the most weak point of wood, realizes a fireproof structure for wooden buildings, and as a covering material, it has excellent fireproof performance, light weight, thin thickness, workability and productivity An object of the present invention is to provide a fire-resistant covering structure and a construction method thereof that are excellent in cost performance and realize a wooden fire-resistant building by the fire-resistant covering structure and the construction method.

That is, conventionally, generally, the foamed refractory material is laminated on a metal support sheet, the support sheet side is provided so as to face the wood, the seams are overlapped and fixed with a stopper, or the joint portion is abutted. A method is known in which the same foamed refractory material is pressed while being heated and closed.

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

In addition, the method of overlapping the seams creates a step on the surface and hinders the construction of finishing materials and the like.

Furthermore, the method of closing and sealing the joint portion while heating the same foamed refractory material cannot be said to have good workability, and can be said to be a difficult construction method to ensure a certain quality.

In addition, there is a method of applying or impregnating an inorganic flame retardant liquid agent (fireproof paint, fireproof paint), but this is effective for fireproof performance that makes it difficult to burn when heated, but as a fireproof structure It is extremely difficult to impart performance that can withstand high temperatures near 1000 ° C.

Furthermore, when covering the structure with a heat-expandable fireproof coating material, if the joint portion is not protected, cracks and opening will occur in the joint portion when the coating material expands when heated, From there, a flame and oxygen inflow occur, and when exposed to a high temperature for a long time, carbonization proceeds, and even if the heat is stopped, it may continue to stand for a long time and the structural strength may be significantly reduced.

The present invention was made in order to solve the above-described problems of the prior art, and the object of the present invention is that the workability of the fireproof coating construction is good, and the construction work environment is also good, The object is to provide a fireproof covering structure and its construction method capable of suppressing the occurrence and progression of groin, which is the weakest point of wood, and to provide a feasible fireproof wooden building.

That is, when the temperature of the periphery of the pillar material 1 is increased, the thermally expandable fireproof covering materials 2 and 2 covered around the surface side of the wooden pillar material 3 expand, and the fireproof covering materials 2 and 2 are expanded. The joint portion 7 that is stopped by the fastener 6 that is a butted portion is closed.

  For this reason, it becomes difficult for smoke and flames to reach the wooden pillar 3 which is the wooden structure body, and the possibility that the wooden pillar 3 is beaten is reduced.

In that case, the sinterable inorganic material used for the said thermally expansible fireproof covering material 2 is excellent in the shape retention after thermal expansion.

Further, the net or mat made of non-combustible fibrous material contributes to improving the shape retention of the thermally expandable fireproof coating material, and even when the thickness of the thermally expandable fireproof coating material is increased, the thermally expandable fireproof material. The covering material is prevented from falling off.

By laminating a net or mat made of a non-combustible fiber material on the thermally expandable fireproof coating material, and / or by laminating the base material layer 4 on one or both surfaces of the thermally expandable fireproof coating material,
Residue retention after expansion is further improved, and the effects of heat insulation and fire resistance are further improved.

The base material layer 4 has a characteristic of maintaining its shape in the residue or on the surface without being melted by being laminated on the heat-expandable fireproof coating material, even at a temperature that normally melts alone. There is a thing, and it can improve the residue retention strength after expansion | swelling further, and there exists an effect which further improves heat insulation performance and fireproof performance.

Moreover, the said heat-expandable fireproof covering material is cut into a desired shape, and these heat-expandable fireproof covering materials or joint portions are fixed by at least one of an adhesive or a stopper. So construction is easy.

When the heat-expandable fireproof covering material is cut into a desired shape, there is no possibility of generating dust like a gypsum board or a calcium silicate plate used conventionally. For this reason, a working environment can be made favorable.

Furthermore, it is possible to mass-produce structural materials that have been pre-fired, so that manufacturing costs can be reduced, and fire work can be reduced from the work process at the time of building construction. Can be.

Examples 1 and 2 below are construction examples of wooden structural members, and as shown in each drawing,
A fireproof coating 2 is coated around the structural material.

The wooden pillar material 3 as the structural material is made of wood of 30 cm × 30 cm square, and the thermal expandable fireproof covering material 2 and the upper and lower thermal expandable fireproof covering materials 2a and 2b have a thickness of 3 mm and 1 .5 mm.
As the heat-expandable fireproof covering materials 2 and 2a and 2b, those obtained in Reference Examples described later are used.

Hereinafter, the embodiments of the present invention will be described in more detail by way of examples. However, the present invention is not limited to these examples.

・ Reference Examples 1-3
Ceramic fibers (“SC bulk” manufactured by Nippon Kayaku Thermal Ceramics Co., Ltd.), thermally expandable graphite (“GREP-EG” manufactured by Tosoh Corporation), and glass fibers (“Glaslon” manufactured by Asahi Fiber Glass Co., Ltd.) with the mixing ratio shown in Table 1. “Chopped strand”, E glass long fiber, fiber diameter: about 10 μm, fiber length: about 3 mm), glass wool (“Glaslon wool” manufactured by Asahi Fiber Glass Co., Ltd., fiber diameter: about 4-7 μm), acrylic resin latex ( An aqueous dispersion of “LX874” manufactured by Nippon Zeon Co., Ltd.) was prepared, and a thermally expandable fireproof coating material having a bulk density and thickness shown in Table 1 was prepared by a papermaking method.
The following performance evaluation was performed about the produced said heat-expandable fireproof covering material. Reference examples 2 and 3 were also carried out in the same manner as in Example 1 with the compounding ratios shown in Table 1. The results are summarized in Table 1.

[Measurement of expansion ratio and stress at break]
Using the samples obtained in Reference Examples 1 to 3, the sample was heated in an electric furnace at a temperature of 1000 ° C. for 1 hour, and the expansion ratio was the ratio of the thickness after heating to the thickness before heating (thickness after heating / The thickness was calculated as the thickness before heating.

In addition, as an index of the shape retention property of the heat-expandable fireproof coating material after expansion by heating, the sample after heating was measured using a compression tester (“Finger Feeling Tester” manufactured by Kato Tech Co., Ltd.).
. The stress at break was measured at a compression rate of 0.1 cm / s with a 25 cm ² indenter.

  The results are shown in Table 1.

Note that when the stress at break of the sample is 0.05 kgf / cm ² or more, even if a fire resistance test is performed in a state of being held vertically, the shape of the thermally expandable fireproof coating material after the heat expansion is Fireproof performance can be fully exhibited without breaking down.

Reference examples 4-5
Production of thermally expandable material Ceramic fiber (“SC Bulk” manufactured by Nikka Chemical Co., Ltd.), thermally expandable graphite (
"GREP-EG" manufactured by Tosoh Corporation), glass fiber ("Glasslon Chopped Strand" manufactured by Asahi Fiber Glass Co., Ltd.), E glass long fiber, fiber diameter: about 10 μm, fiber length: about 3 mm), glass wool (Asahi Fiber Glass Co., Ltd.) “Glasslon Wool”, fiber diameter: about 4-7 μm)
A slurry was prepared by dispersing acrylic resin latex (“LX874” manufactured by Nippon Zeon Co., Ltd.) in water at a blending ratio shown in Table 2. Using a mold having a width of 300 mm, a length of 450 mm, and a thickness of 30 mm, the thermally expandable refractory having a predetermined bulk density in which inorganic fibers are oriented in a substantially constant direction by suction (adsorption molding method) from the thickness direction by a papermaking method. After producing the covering material, the thermal expansion fire-resistant covering material having a predetermined thickness was obtained by slicing in the direction perpendicular to the orientation method of the inorganic fibers.

[Evaluation of the obtained sample]
About the produced said thermally expansible fireproof coating material, evaluation of the volume expansion ratio was performed.
The 50 mm square heat-expandable fireproof coating material is heated in an electric furnace at a temperature of 1000 ° C. for 1 hour, and the width, length, and thickness are measured, and the volume expansion ratio is the volume after heating, before heating. The ratio to the volume (volume after heating / volume before heating) was calculated.

The heated sample preferentially expanded mainly in a direction parallel to the fiber direction, but expansion was also observed in the fiber direction, that is, the thickness direction.

In Example 1 shown in FIGS. 1 and 2, the sheet-like 3 mm-thick thermally expandable fire-resistant coating material 2 obtained in the reference example can be used.
The sheet-like heat-expandable fire-resistant covering material 2 is cut to the size of each surface of the wooden pillar material 3, and is pasted with an epoxy adhesive, and the fire-resistant covering materials 2, 2 at the corners are abutted together. The vicinity of the joint portion 7, which is a part, is fixed to the wooden pillar material 3 by the tucker 6, and the pillar material 1 is obtained.
This fireproof coating structure exhibits excellent fire resistance.

In Example 2 shown in FIGS. 3 and 4, the sheet-like heat-expandable fire-resistant coating material having a thickness of 1.5 mm obtained in the reference example is formed into an L shape, and the lower-layer heat-expandable fire-resistant coating material 2 a. , 2b can be used.
The heat-expandable fireproof coverings 2a and 2b molded into the L shape are double-layered with an epoxy-based adhesive on the wooden pillar 3 so that the joints are alternated, and the heat-expandable fireproof cover is formed. Material 2
The vicinity of the joints 7a and 7b, which are the abutting portions of a and 2b, is fixed to the wooden pillar 3 by the tucker 6 to obtain the pillar 1.
This fireproof coating structure exhibits excellent fire resistance.

It is a horizontal sectional view explaining the composition of the principal part of the pillar material of Example 1 with the construction method of the fireproof covering structure and fireproof covering structure of Embodiment 1 of the present invention. It is a construction method of the fireproof covering structure and fireproof covering structure of Embodiment 1, and is a side view of the pillar material of Example 1. It is a horizontal sectional view explaining the composition of the principal part of the pillar material of Example 2 with the construction method of the fireproof covering structure and fireproof covering structure of Embodiment 1 of the present invention. FIG. 3 is a side view of the column material of Example 2 in the fireproof covering structure and the construction method of the fireproof covering structure of Embodiment 1. It is a schematic principal part sectional drawing which shows the outline of the apparatus for manufacturing the thermally expansible fireproof covering material by an adsorption molding method.

Explanation of symbols

1 Column material (structure)
2 Fire-resistant covering material 2a, 2b Upper and lower layer fire-resistant covering material 3 Wood pillar material (structure material body)
DESCRIPTION OF SYMBOLS 4 Adhesive layer 6 Stopper 7,7a, 7b Joint part 7a, 7b Upper and lower layer joint part 8 Slurry 9 Frame body suction port 10 Filtration member 11 Suction apparatus 12 Adsorption molding apparatus 13 Inorganic fiber 14 Piping 15 Slurry tank

Claims (3)

It is a structure that covers the heat-expandable fireproof covering material on the wooden structure body,
The thermally expandable fireproof coating material comprises 55 to 85% by weight of inorganic fibers, 5 to 30% by weight of thermally expandable inorganic material, 5 to 25% by weight of inorganic binder, and 5 to 15% by weight of organic binder,
The inorganic binder contained in the thermally expandable fireproof coating material has a melting point of 650 to 1000.
A fireproof coating structure comprising a sinterable inorganic material in a range of ° C. The inorganic binder contained in the thermally expandable fireproof coating material is silicon dioxide 50-60.
It is characterized by comprising a sinterable inorganic material containing 10% by weight of aluminum oxide, 10 to 20% by weight of aluminum oxide, 10 to 20% by weight of calcium oxide, 1 to 10% by weight of magnesium oxide, and 8 to 13% by weight of boron oxide. The fireproof covering structure according to claim 1. The construction method for a fire-resistant covering structure according to claim 1 or 2, wherein the heat-expandable fire-resistant covering material is fixed to the wooden structure body by at least one of an adhesive and a stopper. .

Images