Urethane filling structure

Abstract

To provide a urethane filling structure having good workability and excellent fire resistance.SOLUTION: A urethane filling structure is provided with building base materials 10a and 10b having a nonflammable material, and a urethane foam 20 closing a gap 30 having the building base materials 10a and 10b at both ends, and the urethane foam 20 contains a filler.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a urethane filling structure for gaps generated when constructing a space by combining building base materials in a building.

Background Art

[0002] Buildings such as apartment houses, office buildings, and schools are configured by combining building base materials such as ceilings, walls, and floors to form a space. In a building, when installing building base materials such as ceilings, walls, and floors, it is desirable to install them without gaps. However, due to reasons such as the contact surfaces of the building base materials having irregularities, the fit is poor, and gaps may occur. If there are gaps in a building, they can cause the spread of fire when a fire breaks out, so it is necessary to properly close the gaps. As a method of closing the gaps, a method of filling the gaps in a building with a filler having excellent non-combustibility and fire resistance, such as plaster materials such as cement and mortar, dry materials such as putty, and semi-dry materials such as spray-on rock wool, has been proposed (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the wet method using plaster materials such as cement and mortar as a filler requires time for curing, so there are difficulties in workability. Dry materials such as putty may fall off due to vibration or the like, and semi-dry materials such as spray-on rock wool require a dedicated device and have difficulties in detailed workability.

[0005] Therefore, an object of the present invention is to provide a urethane filling structure having good workability and excellent fire resistance.

Means for Solving the Problems

[0006] The present invention has been made to solve the above problems, and the gist of the present invention is as follows. [1] A urethane filling structure comprising a building base material having a non-combustible material and a urethane foam that closes a gap having the building base material at both ends, wherein the urethane foam contains a filler. [2] The urethane filling structure according to [1], wherein the urethane foam is adhered to the building base material. [3] The urethane filling structure according to [1] or [2], wherein the thickness of the urethane foam in the communication direction of the gap is 30 mm or more and 300 mm or less. [4] The urethane filling structure according to any one of [1] to [3], wherein the gap is a gap formed between a plurality of the building base materials. [5] The urethane filling structure according to any one of [1] to [4], wherein the gap is a hole provided in the building base material. [6] The urethane filling structure according to any one of [1] to [5], wherein the width of the gap is 1 mm or more and 100 mm or less. [7] The urethane filling structure according to any one of [1] to [6], wherein the width of the gap is 1 mm or more and 50 mm or less. [8] The urethane filling structure according to any one of [1] to [7], further comprising a backing material that serves as a base for the urethane foam provided in the gap. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a urethane filling structure with good workability and excellent fire resistance. [Brief Description of the Drawings]

[0008]

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Mode for Carrying Out the Invention

[0009] Hereinafter, the present invention will be described in more detail using embodiments.

[0010] [First Embodiment] The urethane filling structure according to the first embodiment of the present invention, as shown in FIG. 1, includes building base materials 10a and 10b made of non-combustible materials, and a urethane foam 20 that closes a gap 30 having the building base materials 10a and 10b at both ends. The urethane foam 20 contains a filler.

[0011] (Building base material) The building base materials 10a and 10b are building base materials that partition the space of a building, and constitute at least a part of, for example, a ceiling, a wall, and a floor. Specifically, when the building base material 10a in FIG. 1 is a wall, the building base material 10b constitutes a ceiling or a floor. When the building base material 10a is a ceiling or a floor, the building base material 10b constitutes a wall. The building base materials 10a and 10b are members that partition the space of a building (the first space A and the second space B). By having a gap 30 with the building base materials 10a and 10b at both ends, the first space A and the second space B communicate with each other. The space A and the space B communicate with each other through the gap 30. When a fire occurs, the flame progresses from the space A to the space B, or from the space B to the space A. In this way, the direction in which the two spaces A and B communicate is the direction in which the flame progresses, and in this specification, it is also referred to as the communication direction.

[0012] By having non-combustible materials, the building base materials 10a and 10b can improve the fire resistance of the space including the gap 30, and make the fire prevention structure stronger. The non-combustible materials in the building base materials 10a and 10b are those defined in the Building Standards Act and the Enforcement Order of the Building Standards Act. The building base materials 10a and 10b only need to have non-combustible materials. From the perspective of making the fireproof structure stronger, they are preferably composed of non-combustible materials alone, or the non-combustible materials are the main raw materials. Being the main raw material means that the non-combustible materials account for most of the building base materials (for example, 50% or more by mass, preferably 70% or more). For example, a combination of non-combustible materials and materials other than non-combustible materials can be obtained by coating non-combustible materials on materials other than non-combustible materials. Note that a metal sandwich panel or the like, which is a combination of non-combustible materials and materials other than non-combustible materials and exhibits non-combustibility with a complex structure material, can be treated as a single material. Examples of materials other than non-combustible materials include wood materials such as OSB, particle board, chip board, hard board, and MDF, paper materials such as corrugated paper, cardboard, and kraft paper, and foams such as urethane foam and styrene foam. The building base materials 10a and 10b are preferably plate-like members (also referred to as "face materials"). Specifically, examples of non-combustible materials used in that case include gypsum board, ALC board, extruded cement board, lightweight wood-wool cement board, wood-chip cement board, metal sandwich panel, calcium silicate board, slate board, concrete, brick, glass, and metal plates (for example, aluminum and iron). The non-combustible materials used for the building base materials 10a and 10b may be used alone or in combination of two or more. From the perspectives of fire resistance and workability, the non-combustible materials used for the building base materials 10a and 10b are preferably gypsum board, ALC board, extruded cement board, lightweight wood-wool cement board, wood-chip cement board, metal sandwich panel, calcium silicate board, concrete, and metal plates.

[0013] (urethane foam) The urethane foam 20 forms a fireproof structure by filling and closing the gap 30 with the building base materials 10a and 10b at both ends. In order to properly close the gap 30 with the urethane foam 20, it is preferable that the urethane foam 20 is adhered to the building base materials 10a and 10b. Since the urethane foam 20 is adhered to the building base materials 10a and 10b, the urethane foam 20 is in close contact with the building base materials 10a and 10b, and the fire resistance can be improved. The urethane foam 20 chemically adheres to the building base materials 10a and 10b. Here, chemically adhering means adhering to the building base materials 10a and 10b based on the self - adhesiveness of the urethane foam 20. Specifically, the chemical adhesion of the urethane foam 20 means that the urethane foam 20 obtained by mixing a polyol - containing composition and a polyisocyanate and curing and foaming directly cures and foams on the surface of the building base materials 10a and 10b, forming an adhered layer to the building base materials 10a and 10b, and adhering based on the self - adhesiveness of the layer. Also, the urethane foam 20 contains a filler. By containing a filler, the properties of the filler can be imparted to the urethane foam 20. For example, by containing a filler having flame - retardant properties, the urethane foam 20 can improve its flame - retardant properties.

[0014] The width W of the gap 30 closed by the urethane foam 20 is preferably 1 mm or more and 50 mm or less, more preferably 3 mm or more and 45 mm or less, and even more preferably 5 mm or more and 40 mm or less. When the width W of the gap 30 closed by the urethane foam 20 is equal to or greater than the above - mentioned lower limit value, it becomes easy to fill the gap 30 with the urethane foam 20, and the workability is good. Also, when the width W of the gap 30 closed by the urethane foam 20 is equal to or less than the above - mentioned upper limit value, the gap 30 can be properly closed with the urethane foam 20, and the fire resistance can be improved.

[0015] The thickness T of the urethane foam 20 in the communication direction of the gap 30 is preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less. When the thickness T of the urethane foam 20 in the communication direction of the gap 30 is equal to or greater than the above lower limit value, the urethane foam 20 is less likely to burn out when a fire occurs, and it becomes easier to ensure the fire resistance in the gap 30. Further, when the thickness T of the urethane foam 20 in the communication direction of the gap 30 is equal to or less than the above upper limit value, the materials and costs for forming the urethane foam 20 can be reduced.

[0016] The density of the urethane foam 20 is not particularly limited, but it is preferably in the range of 20 to 200 kg / m 3 . By setting the density to 200 kg / m 3 or less, the urethane foam becomes lightweight, and it becomes easier to construct a structure in which the gap 30 is filled with the urethane foam 20 in a building. Further, by setting it to 20 kg / m 3 or more, it becomes easier to exhibit the desired flame retardancy and incombustibility. From these viewpoints, the density of the urethane foam is more preferably in the range of 25 to 100 kg / m 3 , and even more preferably in the range of 30 to 80 kg / m 3 . The density of the urethane foam 20 can be measured in accordance with JIS K7222.

[0017] The urethane foam 20 can also be imparted with at least one of flame retardancy, semi-incombustibility, and incombustibility. More specifically, the urethane foam 20 is based on the test method of ISO-5660, and when heated at a radiant heat intensity of 50 kW / m 2 , those with a total heat release of 8 MJ / m 2 or less after 5 minutes are preferably used. More preferably, those with a total heat release of 8 MJ / m 2 or less after 10 minutes are used, and those with a total heat release of 8 MJ / m 2 or less after 20 minutes are even more preferably used.

[0018] The gap 30 is preferably a gap formed between a plurality of building base materials 10a and 10b. Examples of the gap formed between the plurality of building base materials 10a and 10b include, as shown in FIG. 1, a gap formed between the surface of the building base material 10a and the end of the building base material 10b. The gap 30 is not limited to this configuration, and may be a gap formed between the ends of the building base materials, or may be a gap formed between the surfaces of the building base materials. Among these, it is preferable that at least one of the building base materials 10a and 10b is the above-mentioned facing material, and it is more preferable to form the gap 30 between the end (end face) of the facing material constituting the building base material 10b and the building base material 10a. In this case, the building base material 10a may be a facing material or a building base material other than the facing material (for example, concrete, etc.). Further, when the building base material 10a is a facing material, for example, the gap 30 may be a gap formed between the end face of the facing material and the main surface of the facing material. As a method of forming the gap 30 between the plurality of building base materials 10a and 10b, for example, it can be formed by butting the building base materials 10a and 10b against each other or bringing the building base materials 10a and 10b close to each other. By making the gap 30 formed by butting or bringing close the plurality of building base materials 10a and 10b, the width W can be narrowed, and it becomes easier to ensure the fire resistance in the gap 30. The building base materials 10a and 10 forming the gap 30 may be a combination of the same building base materials such as a ceiling, a wall, and a floor, or may be a combination of different building members such as a wall and a floor, a wall and a roof.

[0019] Further, the gap 30 may be a hole provided in the building base materials 10a and 10b. The gap 30 formed by the holes provided in the building base materials 10a and 10b can be provided at a desired location, and the comfort in the building can be improved.

[0020] As a construction method of the urethane foam 20 for filling and closing the gap 30, discharge filling of a liquid urethane resin composition is preferable, and specifically, discharge filling using a spray and a caulking gun is preferable. Specifically, it is preferable to discharge a liquid urethane resin composition into the gap 30 between the pre-installed building base materials 10a and 10b, cure it, and thereby form the urethane foam 20 to close the gap 30. Alternatively, it is preferable to discharge a liquid urethane resin composition onto either one of the pre-installed building base materials 10a and 10b, bring the different other building base material 10a or 10b into contact or close proximity before the urethane resin composition cures, cure the urethane resin composition to form the urethane foam 20, and close the gap 30. Alternatively, a liquid urethane resin composition can be discharged onto either one of the pre-installed building base materials 10a and 10b, and after curing, the different other building base material 10a or 10b can be pressed against the urethane foam 20. Although it can be expected to close the gap 30 by deforming the urethane foam 20, if the degree of closure is insufficient, additional construction of the urethane foam 20 may be carried out.

[0021] The filling material for forming the urethane foam 20 is a urethane resin composition containing a filler. The urethane resin composition generally contains a polyisocyanate compound and a polyol compound, and further contains a filler in the present invention.

[0022] <Polyisocyanate compound> Examples of the polyisocyanate compound used for the urethane foam 20 include aromatic polyisocyanates, alicyclic polyisocyanates, aliphatic polyisocyanates, and the like. Examples of the aromatic polyisocyanate include phenylenediisocyanate, tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, dimethyldiphenylmethane diisocyanate, triphenylmethane triisocyanate, naphthalene diisocyanate, polymethylene polyphenyl polyisocyanate (polymeric MDI), and the like.

[0023] Examples of alicyclic polyisocyanates include cyclohexylene diisocyanate, methylcyclohexylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, dimethyldicyclohexylmethane diisocyanate, and the like. Examples of aliphatic polyisocyanates include methylene diisocyanate, ethylene diisocyanate, propylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, and the like. The polyisocyanate compound may be used alone or two or more thereof may be used. Due to reasons such as ease of use and easy availability, diphenylmethane diisocyanate (MDI), polymeric MDI, etc. are preferred as the polyisocyanate compound.

[0024] <Polyol compound> Examples of the polyol compound include polycarbonate polyol, aromatic polyol, alicyclic polyol, aliphatic polyol, polyester polyol, polymer polyol, polyether polyol, and the like. Examples of the polycarbonate polyol include polyols obtained by a dealcoholization reaction of a hydroxyl group-containing compound such as ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, octanediol, nonanediol, and the like with diethylene carbonate, dipropylene carbonate, and the like.

[0025] Examples of the aromatic polyol include bisphenol A, bisphenol F, phenol novolak, cresol novolak, etc. Examples of the alicyclic polyol include cyclohexanediol, methylcyclohexanediol, isophoronediol, dicyclohexylmethanediol, dimethyldicyclohexylmethanediol, etc. Examples of the aliphatic polyol include ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, etc. Further, hydroxycarboxylic acids such as castor oil can also be used.

[0026] Examples of the polyester polyol include polymers obtained by dehydration condensation of polybasic acids and polyhydric alcohols, polymers obtained by ring-opening polymerization of lactones such as ε-caprolactone and α-methyl-ε-caprolactone, and condensates of hydroxycarboxylic acids and the above polyhydric alcohols, etc. Here, specific examples of the polybasic acid include adipic acid, azelaic acid, sebacic acid, terephthalic acid, isophthalic acid, succinic acid, etc. Specific examples of the polyhydric alcohol include bisphenol A, ethylene glycol, 1,2-propylene glycol, 1,4-butanediol, diethylene glycol, 1,6-hexanediol, neopentyl glycol, etc. Specific examples of the hydroxycarboxylic acid include castor oil, reaction products of castor oil and ethylene glycol, etc.

[0027] Examples of the polymer polyol include polymers obtained by graft polymerization of ethylenically unsaturated compounds such as acrylonitrile, styrene, methyl acrylate, methacrylate, etc. onto the above-mentioned aromatic polyol, alicyclic polyol, aliphatic polyol, polyester polyol, etc., polybutadiene polyol, modified polyols of polyhydric alcohols, or hydrogenated products thereof, etc. Examples of the modified polyol of polyhydric alcohol include those obtained by modifying the raw material polyhydric alcohol by reacting it with an alkylene oxide, etc. Examples of the polyhydric alcohol used for the modified polyol include trihydric alcohols such as glycerin and trimethylolpropane, pentaerythritol, sorbitol, mannitol, sorbitan, diglycerin, dipentaerythritol, etc., sucrose, glucose, mannose, fructose, methyl glucoside and its derivatives, etc., tetra- to octavalent alcohols, phenol, phloroglucin, cresol, pyrogallol, catechol, hydroquinone, bisphenol A, bisphenol F, bisphenol S, 1-hydroxynaphthalene, 1,3,6,8-tetrahydroxynaphthalene, anthrol, 1,4,5,8-tetrahydroxyanthracene, 1-hydroxypyrene and other phenol polybutadiene polyols, castor oil polyol, polymers or copolymers of hydroxyalkyl (meth)acrylate, and polyfunctional (for example, the number of functional groups is 2 to 100) polyols such as polyvinyl alcohol, and condensates (novolac) of phenol and formaldehyde.

[0028] The method for modifying the polyhydric alcohol is not particularly limited, but a method of adding an alkylene oxide (hereinafter abbreviated as AO) is preferably used. Examples of AO include AO having 2 to 6 carbon atoms, for example, ethylene oxide (hereinafter abbreviated as EO), 1,2-propylene oxide (hereinafter abbreviated as PO), 1,3-propylene oxide, 1,2-butylene oxide, 1,4-butylene oxide, etc. Among these, from the viewpoints of properties and reactivity, PO, EO and 1,2-butylene oxide are preferable, and PO and EO are more preferable. When using two or more kinds of AO (for example, PO and EO), the addition method may be block addition, random addition, or a combination of these.

[0029] Examples of the polyether polyol include polymers obtained by ring-opening polymerization of at least one kind of alkylene oxide such as ethylene oxide, propylene oxide, and tetrahydrofuran in the presence of at least one kind of low molecular weight active hydrogen compound having two or more active hydrogens. Examples of the low-molecular-weight active hydrogen compound having two or more active hydrogens used in the polyether polyol include diols such as bisphenol A, ethylene glycol, propylene glycol, butylene glycol, 1,6-hexanediol, triols such as glycerin and trimethylolpropane, and amines such as ethylenediamine and butylenediamine.

[0030] Since the above polyol compound has a great effect of reducing the total calorific value when burned, it is preferable to use at least one selected from polyester polyol and polyether polyol, and polyester polyol is more preferable. Among them, it is preferable to use a polyester polyol having a molecular weight of 200 to 800, and it is more preferable to use a polyester polyol having a molecular weight of 300 to 500.

[0031] The urethane resin composition may contain a monoalcohol compound having only one hydroxyl group. Examples of the monoalcohol compound include 3-bromo-2,2-bis(bromomethyl)propan-1-ol.

[0032] The isocyanate index of the urethane resin is preferably in the range of 120 to 1,000, more preferably in the range of 200 to 800, and even more preferably in the range of 300 to 600. When the isocyanate index is 120 or more, the isocyanate group becomes excessive compared to the hydroxyl group and is easily trimerized. Also, when it is 300 or more, it is easy to impart nonflammability. Further, when it is 1,000 or less, the balance between nonflammability and manufacturing cost becomes good. The isocyanate index can be calculated by a conventionally known method.

[0033] <Filler> The filler contained in the urethane foam 20 is included as a solid content in the urethane resin composition, and is generally a component present in a granular or powdery form in the urethane resin composition. The filler contained in the urethane foam 20 is preferably a solid flame retardant. In the present invention, by using a solid flame retardant, the flame retardancy of the urethane foam 20 can be effectively enhanced. Further, the solid flame retardant is usually in a state of being dispersed as a powder component in a polyol liquid, a urethane resin composition, etc. Note that the solid flame retardant is a flame retardant that becomes solid at normal temperature (23 °C) and normal pressure (1 atm). Specific examples of the solid flame retardant include red phosphorus-based flame retardants, phosphate-containing flame retardants, bromine-containing flame retardants, chlorine-containing flame retardants, antimony-containing flame retardants, boron-containing flame retardants, metal hydroxides, and acicular fillers. These may be used alone or in combination of two or more.

[0034] 《Red Phosphorus-Based Flame Retardant》 The red phosphorus-based flame retardant may be composed of red phosphorus alone, or may be red phosphorus coated with a resin, a metal hydroxide, a metal oxide, etc., or may be a mixture of red phosphorus with a resin, a metal hydroxide, a metal oxide, etc. The resin for coating or mixing with red phosphorus is not particularly limited, but examples include thermosetting resins such as phenol resin, epoxy resin, unsaturated polyester resin, melamine resin, urea resin, aniline resin, and silicone resin. From the viewpoint of flame retardancy, metal hydroxides are preferred as the compound for coating or mixing. As the metal hydroxide, those described later may be appropriately selected and used.

[0035] 《Phosphate-Containing Flame Retardant》 Examples of the phosphate-containing flame retardant include phosphates composed of salts of various phosphoric acids and at least one metal or compound selected from metals in Groups IA to IVB of the periodic table, ammonia, aliphatic amines, aromatic amines, and heterocyclic compounds containing nitrogen in the ring. The phosphoric acid is not particularly limited, and examples include monophosphoric acid, pyrophosphoric acid, polyphosphoric acid, etc. Examples of the metals in Groups IA to IVB of the periodic table include lithium, sodium, calcium, barium, iron(II), iron(III), aluminum, etc. Examples of the aliphatic amine include methylamine, ethylamine, diethylamine, triethylamine, ethylenediamine, piperazine, etc. Examples of the aromatic amine include aniline, o-toluidine, 2,4,6-trimethylaniline, anisidine, 3-(trifluoromethyl)aniline, etc. Examples of the heterocyclic compound containing nitrogen in the ring include pyridine, triazine, melamine, etc.

[0036] Specific examples of the phosphate-containing flame retardant include, for example, monophosphate, pyrophosphate, polyphosphate, etc. Here, the polyphosphate is not particularly limited, and examples thereof include ammonium polyphosphate, piperazine polyphosphate, melamine polyphosphate, ammonium amide polyphosphate, aluminum polyphosphate, etc. One or more of the above-mentioned phosphate-containing flame retardants can be used.

[0037] 《Bromine-containing Flame Retardant》 The bromine-containing flame retardant is not particularly limited as long as it is a compound containing bromine in its molecular structure and is solid at normal temperature and pressure. Examples thereof include aromatic compounds containing brominated aromatic rings, etc. Examples of the aromatic compound containing brominated aromatic rings include monomeric organic bromine compounds such as hexabromobenzene, pentabromotoluene, hexabromobiphenyl, decabromobiphenyl, decabromodiphenyl ether, octabromodiphenyl ether, hexabromodiphenyl ether, bis(pentabromophenoxy)ethane, ethylenebis(pentabromophenyl), ethylenebis(tetrabromophthalimide), tetrabromobisphenol A, etc.

[0038] Also, the brominated aromatic ring-containing aromatic compound may be a bromine compound polymer. Specifically, examples include polycarbonate oligomers produced from brominated bisphenol A, brominated polycarbonates such as copolymers of this polycarbonate oligomer and bisphenol A, diepoxy compounds produced by the reaction of brominated bisphenol A and epichlorohydrin, and the like. Further, brominated epoxy compounds such as monoepoxy compounds obtained by the reaction of brominated phenols and epichlorohydrin, poly(brominated benzyl acrylate), condensates of brominated phenols of brominated polyphenylene ether, brominated bisphenol A, and cyanuric chloride, brominated polystyrenes such as brominated (polystyrene), poly(brominated styrene), crosslinked brominated polystyrene, crosslinked or non-crosslinked brominated poly(α-methylstyrene), and the like can be mentioned. Also, compounds other than the brominated aromatic ring-containing aromatic compounds such as hexabromocyclododecane may be used. These bromine-containing flame retardants may be used alone or in combination of two or more.

[0039] 《Chlorine-containing Flame Retardants》 Examples of the chlorine-containing flame retardants include those commonly used in flame-retardant resin compositions, such as polychlorinated naphthalene, chlorendic acid, dodecachlorododecahydrodimethanodibenzocyclooctene sold under the trade name "Dechlorane Plus", and the like.

[0040] 《Antimony-containing Flame Retardants》 Examples of the antimony-containing flame retardants include antimony oxide, antimonate, pyroantimonate, and the like. Examples of antimony oxide include antimony trioxide, antimony pentoxide, and the like. Examples of antimonate include sodium antimonate, potassium antimonate, and the like. Examples of pyroantimonate include sodium pyroantimonate, potassium pyroantimonate, and the like. The antimony-containing flame retardants may be used alone or in combination of two or more. The antimony-containing flame retardant used in the present invention is preferably antimony oxide.

[0041] 《Boron-containing flame retardant》 Examples of the boron-containing flame retardant include borax, boron oxide, boric acid, borate, etc. Examples of boron oxide include diboron trioxide, boron trioxide, diboron dioxide, tetraboron trioxide, tetraboron pentoxide, etc. Examples of borates include borates of alkali metals, alkaline earth metals, elements of Group 4, Group 12, Group 13 of the periodic table, and ammonium. Specifically, alkali metal borates such as lithium borate, sodium borate, potassium borate, cesium borate, etc., alkaline earth metal borates such as magnesium borate, calcium borate, barium borate, etc., zirconium borate, zinc borate, aluminum borate, ammonium borate, etc. The boron-containing flame retardant may be used alone or in combination of two or more. The boron-containing flame retardant used in the present invention is preferably a borate, and more preferably zinc borate.

[0042] 《Metal hydroxide》 Examples of metal hydroxides include magnesium hydroxide, calcium hydroxide, aluminum hydroxide, iron hydroxide, nickel hydroxide, zirconium hydroxide, titanium hydroxide, zinc hydroxide, copper hydroxide, vanadium hydroxide, tin hydroxide, talc, etc. Among these, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, and talc are preferred. The metal hydroxide may be used alone or in combination of two or more.

[0043] 《Needle-shaped filler》 Examples of the acicular filler include potassium titanate whiskers, aluminum borate whiskers, silicon-containing whiskers, wollastonite, sepiolite, zonolite, eleolite, boehmite, glass fibers, asbestos fibers, carbon fibers, graphite fibers, slag fibers, silica fibers, alumina fibers, silica alumina fibers, zirconia fibers, boron nitride fibers, stainless steel fibers, etc. Among these, wollastonite is preferable. The aspect ratio (length / diameter) of the acicular filler preferably ranges from 5 to 50, more preferably from 10 to 40.

[0044] 《Inorganic Filler》 As the filler contained in the urethane foam 20, an inorganic filler other than the above-mentioned solid flame retardant may be contained. By containing the inorganic filler, various functions can be imparted to the urethane foam 20, such as improving the mechanical strength of the urethane foam 20. The inorganic filler is not particularly limited. For example, silica, diatomaceous earth, alumina, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dawsonite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, potassium salts such as calcium silicate, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass beads, silica balloons, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon balloons, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, various magnetic powders, fly ash, etc. The inorganic filler may be used alone or in combination of two or more. Further, the inorganic filler may be used in combination with the above-mentioned solid flame retardant, but it is not necessarily required to be used in combination.

[0045] 《Content of Filler》 In the present invention, the content of the filler in the urethane foam 20 (i.e., the urethane resin composition) is preferably 4 parts by mass or more, more preferably 6 parts by mass or more, and even more preferably 12 parts by mass or more with respect to 100 parts by mass of the urethane resin. By setting the content of the filler to be equal to or higher than these lower limit values, it becomes easier to impart various performances according to the type of the filler, such as flame retardancy and mechanical strength, to the urethane foam 20. Further, the content of the filler is preferably 80 parts by mass or less, more preferably 60 parts by mass or less, and even more preferably 40 parts by mass or less with respect to 100 parts by mass of the urethane resin. By setting the content of the filler to be equal to or lower than these upper limit values, the viscosity of the urethane resin composition becomes appropriate, and it becomes easier to form the urethane foam 20 by spraying or the like.

[0046] Note that the urethane foam is formed by the reaction of the polyol component and the polyisocyanate component contained in the urethane resin composition. Therefore, "100 parts by mass of the urethane resin" in the urethane resin composition in this specification means 100 parts by mass of the total amount of the polyol component and the polyisocyanate component in the urethane resin composition. However, when the urethane resin composition contains at least one of a prepolymer obtained by previously reacting the polyol component and the polyisocyanate component, and a monoalcohol component, 100 parts by mass of the urethane resin means that the total amount of the polyol component, the polyisocyanate component, the prepolymer, and the monoalcohol component is 100 parts by mass.

[0047] In addition, as described above, from the viewpoint of imparting flame retardancy, the filler in the urethane foam 20 is preferably a solid flame retardant. The solid flame retardant may be used alone as the filler, or may be used in combination with other fillers such as an inorganic filler. From the viewpoint of improving flame retardancy, the solid flame retardant is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 85 to 100% by mass, and most preferably 100% by mass with respect to the total amount of the fillers.

[0048] <Liquid flame retardant> The urethane foam 20 (i.e., the urethane resin composition) preferably further contains a liquid flame retardant. When a liquid flame retardant is used, the flame retardancy of the urethane foam 20 can be improved without significantly increasing the viscosity of the urethane resin composition. Further, it is more preferable to use the liquid flame retardant in combination with the above-described solid flame retardant. The liquid flame retardant is a flame retardant that is liquid at normal temperature and normal pressure. Specific examples of the liquid flame retardant include phosphate esters. As the phosphate ester, a monophosphate ester, a condensed phosphate ester, etc. can be used. A monophosphate ester is a phosphate ester having one phosphorus atom in the molecule. The monophosphate ester is not limited as long as it is liquid at normal temperature and normal pressure. For example, trialkyl phosphates such as trimethyl phosphate, triethyl phosphate, tributyl phosphate, tri(2-ethylhexyl) phosphate, halogen-containing phosphate esters such as tris(β-chloropropyl) phosphate, trialkoxy phosphates such as tributoxyethyl phosphate, aromatic ring-containing phosphate esters such as tricresyl phosphate, trixylenyl phosphate, tris(isopropylphenyl) phosphate, cresyl diphenyl phosphate, diphenyl(2-ethylhexyl) phosphate, acidic phosphate esters such as monoisodecyl phosphate, diisodecyl phosphate, etc. can be mentioned.

[0049] Examples of the condensed phosphate ester include aromatic condensed phosphate esters such as trialkyl polyphosphate, resorcinol polyphenyl phosphate, bisphenol A polycresyl phosphate, bisphenol A polyphenyl phosphate. Examples of commercially available products of the condensed phosphate ester include "CR-733S", "CR-741", "CR747" manufactured by Daihachi Chemical Industry Co., Ltd., "ADEKA STAB PFR", "FP-600" manufactured by ADEKA Corporation, etc.

[0050] The liquid flame retardant may be used alone or in combination of two or more thereof from among those described above. Among these, from the viewpoints of easily adjusting the viscosity of the urethane resin composition and improving the flame retardancy of the urethane foam 20, monophosphate ester is preferable, and halogen-containing phosphate esters such as tris(β-chloropropyl) phosphate are more preferable. The content of the liquid flame retardant in the urethane foam 20 (that is, the urethane resin composition) is preferably 1 to 40 parts by mass, more preferably 2 to 30 parts by mass, and even more preferably 4 to 20 parts by mass with respect to 100 parts by mass of the urethane resin. By setting the blending amount of the liquid flame retardant to be equal to or higher than these lower limit values, it becomes easier to exhibit the effect of containing the liquid flame retardant. Also, by setting it to be equal to or lower than the upper limit value, the foaming of the urethane resin composition is not inhibited by the liquid flame retardant.

[0051] As described above, the urethane foam 20 is formed by curing and foaming the urethane resin composition. As described above, the urethane resin composition contains a polyol compound, an isocyanate compound, and a filler, and generally further contains a catalyst, a foaming agent, and the like.

[0052] <Catalyst> The urethane resin composition of the present invention may contain, for example, a trimerization catalyst, a resinification catalyst, or both as a catalyst, but it is preferable to contain both. The trimerization catalyst is a catalyst that reacts with the isocyanate groups contained in the polyisocyanate to trimerize them and promotes the formation of an isocyanurate ring. By using the trimerization catalyst, the flame retardancy of the urethane foam 20 is further improved. As the trimerization catalyst, nitrogen-containing aromatic compounds such as tris(dimethylaminomethyl)phenol, 2,4-bis(dimethylaminomethyl)phenol, 2,4,6-tris(dialkylaminoalkyl)hexahydro-S-triazine, alkali metal carboxylates such as potassium acetate, potassium 2-ethylhexanoate, potassium octylate, tertiary ammonium salts such as trimethylammonium salt, triethylammonium salt, triphenylammonium salt, and quaternary ammonium salts such as tetramethylammonium salt, tetraethylammonium, tetraphenylammonium salt, triethylmonomethylammonium salt, etc. can be used. Examples of the ammonium salt include ammonium salts of carboxylic acids such as 2,2-dimethylpropanoic acid, and more specifically, quaternary ammonium salts of carboxylic acids. These may be used alone or in combination of two or more. Among these, one or more selected from alkali metal carboxylates and quaternary ammonium salts of carboxylic acids are preferable, and a mode of using both of them is also preferable.

[0053] The blending amount of the trimerization catalyst is preferably 0.6 to 10 parts by mass, more preferably 0.8 to 8 parts by mass, and even more preferably 1.0 to 6 parts by mass with respect to 100 parts by mass of the urethane resin. When the amount is not less than these lower limits, the trimerization of isocyanate proceeds appropriately and it is easy to impart flame retardancy. Also, when the amount is not more than the upper limit, an appropriate foaming rate can be maintained and it is easy to handle.

[0054] The resinification catalyst is a catalyst that promotes the reaction between the polyol compound and the polyisocyanate. Examples of the resinification catalyst include amine-based catalysts such as imidazole compounds and piperazine compounds, and metal-based catalysts. Examples of imidazole compounds include tertiary amines in which the secondary amine at the 1-position of the imidazole ring is substituted with an alkyl group, an alkenyl group, etc. Specifically, N-methylimidazole, 1,2-dimethylimidazole, 1-ethyl-2-methylimidazole, 1-methyl-2-ethylimidazole, 1,2-diethylimidazole, 1-isobutyl-2-methylimidazole, etc. may be mentioned. Further, an imidazole compound in which the secondary amine in the imidazole ring is substituted with a cyanoethyl group may also be used. Examples of piperazine compounds include tertiary amines such as N-methyl-N’N’-dimethylaminoethylpiperazine and trimethylaminoethylpiperazine. Examples of resinification catalysts include, in addition to imidazole compounds and piperazine compounds, various tertiary amines such as pentamethyldiethylenetriamine, triethylamine, N-methylmorpholine bis(2-dimethylaminoethyl) ether, N,N,N’,N”,N”-pentamethyldiethylenetriamine, N,N,N’-trimethylaminoethyl-ethanolamine, bis(2-dimethylaminoethyl) ether, N,N-dimethylcyclohexylamine, diazabicycloundecene, triethylenediamine, tetramethylhexamethylenediamine, tripropylamine, etc.

[0055] Examples of metal-based catalysts include metal salts composed of lead, tin, bismuth, copper, zinc, cobalt, nickel, etc., preferably metal organic acid salts composed of lead, tin, bismuth, copper, zinc, cobalt, nickel, etc. More preferably, dibutyltin dilaurate, dioctyltin dilaurate, dioctyltin versatate, bismuth trioctoate, bismuth tris(2-ethylhexanoate), dioctyltin acid, lead dioctylate, etc. may be mentioned, and among them, bismuth organic acid salts are even more preferable. The resinification catalyst may be used alone or in combination of two or more.

[0056] The compounding amount of the resinification catalyst is preferably 0.6 to 10 parts by mass, more preferably 0.8 to 8 parts by mass, and even more preferably 1.0 to 6 parts by mass with respect to 100 parts by mass of the urethane resin. When the compounding amount of the resinification catalyst is equal to or more than these lower limit values, urethane bonds are easily formed and the reaction proceeds rapidly. On the other hand, when it is equal to or less than these upper limit values, the reaction rate is easily controlled.

[0057] <Foaming agent> The foaming agent contained in the urethane resin composition foams the urethane resin. Specific examples of the foaming agent include, for example, water, organic physical foaming agents, inorganic physical foaming agents, and the like. Examples of the organic physical foaming agents include low-boiling hydrocarbons such as propane, butane, pentane, hexane, heptane, cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, ether compounds such as dimethyl ether and diisopropyl ether, chlorinated aliphatic hydrocarbon compounds such as dichloroethane, propyl chloride, isopropyl chloride, butyl chloride, isobutyl chloride, pentyl chloride, isopentyl chloride, and fluorine compounds such as trichloromonofluoromethane and trichlorotrifluoroethane.

[0058] Also, hydrofluorocarbons and hydrofluoroolefins are also included. Examples of the hydrofluorocarbons include compounds having 1 to 4 carbon atoms, and fluorocarbons such as CHF 3 、CH 2 F 2 、CH 3 F may be used, or hydrochlorofluorocarbon compounds having a chlorine atom may be used. Examples of the hydrochlorofluorocarbon compounds include dichloromonofluoroethanes such as HCFC22 (chlorodifluoromethane) and HCFC141b (1,1-dichloro-1-fluoroethane), monochlorodifluoroethanes such as HCFC142b (1-chloro-1,1-difluoroethane), HFC-245fa (1,1,1,3,3-pentafluoropropane), HFC-365mfc (1,1,1,3,3-pentafluorobutane), and the like. Examples of the hydrofluoroolefin include fluoroalkenes having about 3 to 6 carbon atoms. The hydrofluoroolefin may be a hydrochlorofluorooletin having a chlorine atom, and thus may be a chlorofluoroalkene having about 3 to 6 carbon atoms. More specifically, examples include trifluoropropene, tetrafluoropropenes such as HFO-1234, pentafluoropropenes such as HFO-1225, chlorotrifluoropropenes such as HFO-1233, chlorodifluoropropene, chlorotrifluoropropene, and chlorotetrafluoropropene. Even more specifically, examples include 1,3,3,3-tetrafluoropropene (HFO-1234ze), 1,1,1,2,3-pentafluoropropene (HFO-1225yez), 1-chloro-3,3,3-trifluoropropene (HFO-1233zd), and 1,1,1,4,4,4-hexafluorobut-2-ene (HFO-1336mzzZ). Examples of the inorganic physical foaming agent include inorganic physical foaming agents such as nitrogen gas, oxygen gas, argon gas, and carbon dioxide gas. Among these, from the viewpoints of foamability, handleability, etc., water, hydrofluorocarbons, and hydrofluoroolefins are preferable. From the viewpoints of low environmental impact and good foamability, hydrofluoroolefins and water are more preferable, and hydrofluoroolefins are even more preferable. It is also preferable to use water in combination with a hydrofluorocarbon or water in combination with a hydrofluoroolefin.

[0059] The blending amount of the foaming agent used in the urethane resin composition is preferably 0.1 to 30 parts by mass, more preferably 0.5 to 20 parts by mass, and even more preferably 1 to 15 parts by mass with respect to 100 parts by mass of the urethane resin. When the content of the foaming agent is at least the above lower limit value, foaming is promoted and the density of the resulting urethane foam 20 can be reduced. When it is at most the above upper limit value, it is possible to prevent the foam from collapsing and the foam not being formed.

[0060] <Foaming agent The urethane resin composition preferably further contains a foaming agent. The foaming agent contained in the urethane resin composition improves the foamability of the urethane resin composition, and those having high foam stability are preferred. By using a foaming agent having high foam stability, a urethane foam having a high closed cell ratio can be obtained. Examples of the foaming agent include surfactants such as polyoxyalkylene-based foaming agents such as polyoxyalkylene alkyl ethers, and silicone-based foaming agents such as organopolysiloxanes. Among these, silicone-based foaming agents are preferred. Examples of the silicone-based foaming agent include graft copolymers of polyoxyalkylene glycol, which is a polymer of ethylene oxide or propylene oxide, and polydimethylsiloxane. In addition, those having the chemical structure of a block copolymer of polydimethylsiloxane and polyether can also be used. Commercially available products of the foaming agent contained in the urethane resin composition include "SH-193", "SZ-1671", "SZ-1642", etc. manufactured by Toray Dow Corning Co., Ltd. In the urethane resin composition, the blending amount of the foaming agent with respect to the urethane resin is preferably, for example, 0.1 to 5 parts by mass, more preferably 0.3 to 3 parts by mass, and even more preferably 0.5 to 2 parts by mass with respect to 100 parts by mass of the urethane resin.

[0061] The resinification catalyst, trimerization catalyst, foaming agent, and foaming agent may each be used alone or two or more thereof may be used.

[0062] Furthermore, the urethane resin composition may contain additives such as antioxidants, anti-settling agents, heat stabilizers, metal damage preventers, antistatic agents, stabilizers, crosslinking agents, lubricants, softeners, and tackifier resins, as necessary, within a range not impairing the object of the present invention.

[0063] The urethane resin composition is preferably a two-component curing type, and before the formation of the urethane foam 20, it is advisable to divide it into one component and two components. By using a two-component curing type, the foamability becomes good and it becomes easier to increase the closed cell ratio. Specifically, it is advisable to divide it into a polyol liquid agent (one component) containing a polyol compound and an isocyanate liquid agent (two components) containing a polyisocyanate compound. At this time, components other than the polyol compound and the polyisocyanate compound contained in the urethane resin composition may be appropriately blended into either the polyol liquid agent or the isocyanate liquid agent, but preferably it is blended into the polyol liquid agent. This is because the polyol compound has low reactivity and side reactions are less likely to occur even when it is mixed with components other than the polyol compound and the polyisocyanate compound.

[0064] The urethane resin composition stores one component containing a polyisocyanate compound and two components containing a polyol compound in separate storage chambers, and the reaction starts by mixing the one component and the two components supplied from each storage chamber in a mixing section or the like. As time passes, the viscosity increases, curing and foaming progress, fluidity is lost, and it becomes the urethane foam 20. Each storage chamber may be provided in separate containers, or two storage chambers may be provided in one container. The urethane resin composition is usually cured and foamed by being left at around room temperature (for example, about 10 to 40 °C), but heating or the like may be performed if necessary.

[0065] According to the urethane filling structure according to the first embodiment, a fireproof structure with excellent fire resistance can be achieved by the urethane foam closing the gap generated by butting or bringing close to each other the building base materials, or the gap of the hole provided in the building base material. In addition, since the urethane foam can be formed by discharge filling using a spray and a caulking gun, the workability is good.

[0066] [Second Embodiment] In the second embodiment, the difference from the first embodiment is that, as shown in FIG. 2, a backing material 40 provided in the gap 30 and serving as the basis of the urethane foam 20 is further provided. Hereinafter, the differences between the second embodiment and the first embodiment will be described. In the following description of different embodiments, members having the same configuration are denoted by the same reference numerals.

[0067] The backing material 40 receives the liquid urethane resin composition and contributes to closing the gap 30 as the basis of the urethane foam 20. Examples of the backing material 40 include fibrous materials such as rock wool, glass wool, and cellulose fiber; inorganic materials such as gypsum board, ALC board, extruded cement board, potassium silicate board, slate board, concrete, brick, glass, and mortar; wood materials such as plywood, OSB, and particle board; metal materials such as metal panels and metal sandwich panels; organic materials such as waterproof sheets made of asphalt, EPDM, and TPO, and urethane foam heat insulating materials. Among them, from the viewpoints of followability to the installation location and workability, the backing material 40 is preferably a fibrous material. Since the backing material 40 remains in the urethane foam 20 even after receiving the filler by discharge filling, it is preferable to employ a non-combustible material that can impart a function to the urethane foam 20. The backing material 40 may be used alone or in combination of two or more. In addition, the backing material 40 can adopt a plate-shaped member. By the backing material 40 being a plate-shaped member, the liquid urethane resin composition can be received well. The plate-shaped backing material 40 is preferably a surface inclined with respect to the communication direction in the gap 30, a surface perpendicular to the axial direction, or a combination thereof, and more preferably includes a perpendicular surface from the viewpoint of receiving the filler well.

[0068] In the urethane filling structure including the backing material 40, as a construction method of the urethane foam 20 for filling and closing the gap 30, discharge filling for discharging the liquid urethane resin composition is preferable, and specifically, discharge filling using a spray and a caulking gun is preferable. Specifically, it is preferable to dispose the filler 40 in the gap 30 between the previously installed building base materials 10a and 10b, then discharge a liquid urethane resin composition and cure it to form the urethane foam 20 and close the gap 30. Alternatively, the filler 40 may be disposed on either one of the previously installed building base materials 10a and 10b, then a liquid urethane resin composition is discharged. Before the urethane resin composition cures, the other different building base material 10a or 10b is butted against or brought close to it, and the urethane resin composition is cured to form the urethane foam 20 and close the gap 30. Alternatively, after disposing the filler 40 on either one of the previously installed building base materials 10a and 10b, a liquid urethane resin composition is discharged onto either one of the building base materials 10a and 10b and cured. Then, the other different building base material 10a or 10b can be pressed against the urethane foam 20. Although it is expected to close the gap 30 by deforming the urethane foam 20, if the degree of closure is insufficient, additional construction of the urethane foam 20 may be carried out.

[0069] The thickness of the urethane foam 20 in the communication direction of the gap 30 is the sum of the thickness T from the filler 40 1 and the thickness T 2 The sum of the thickness T 1 and the thickness T 2 From the above viewpoints, the sum is preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less. Also, the thickness T 1 , T 2 of the urethane foam 20 in the communication direction of the gap 30 is preferably 15 mm or more and 150 mm or less, more preferably 20 mm or more and 125 mm or less, and even more preferably 25 mm or more and 100 mm or less.

[0070] According to the urethane filling structure according to the second embodiment, by providing the backing material, the installation of the urethane foam becomes easy, the gap can be more reliably closed with the urethane foam, and a fireproof structure excellent in fire resistance can be obtained. Further, by providing the backing material, the gap formed between a plurality of building base materials or the gap of the hole provided in the building base material can be easily closed with the urethane foam, and the workability is improved.

[0071] [Third Embodiment] The difference between the third embodiment and the first embodiment is that, as shown in FIGS. 3(a) and 3(b), the building base materials 11a, 11b and the building base materials 12a, 12b form a hollow floor, and the gaps 30 having the building base materials 11a, 11b or the building base materials 12a, 12b forming the hollow floor at both ends are closed with the urethane foam 21a or the urethane foam 21b. Hereinafter, the differences between the third embodiment and the first embodiment will be described. In the following, also in the description of different embodiments, the same reference numerals are given to members having the same configuration.

[0072] The building base materials 11a, 11b and the building base materials 12a, 12b are hollow floors as building members that partition the upper and lower floors (the first space A and the second space B) of the building. Specifically, the building base materials 11a, 11b in FIG. 3 are the upper floor side floors, and the building base materials 12a, 12b are the lower floor side ceilings. The building base materials 11a, 11b and the building base materials 12a, 12b can adopt the same materials as the building base materials 10a, 10b described in the first embodiment, so the details are the same as above and the description is omitted.

[0073] As shown in FIG. 3(a), the urethane foam 21a forms a fireproof structure by filling and closing the gap 30 having the building base materials 11a, 11b at both ends. Alternatively, as shown in FIG. 3(b), the urethane foam 21b forms a fireproof structure by filling and closing the gap 30 having the building base materials 12a, 12b at both ends. The urethane foams 21a and 21b can adopt the same materials as the urethane foam 20 described in the first embodiment, so the details are the same as above and the description is omitted.

[0074] The gap 30 is preferably a gap formed between a plurality of building base materials 11a and 11b or between 12a and 12b. Examples of the gap formed between a plurality of building base materials 11a and 11b include, for example, a gap formed between the end of the building base material 11a and the end of the building base material 11b as shown in Fig. 3(a). Alternatively, examples of the gap formed between a plurality of building base materials 12a and 12b include, for example, a gap formed between the end of the building base material 12a and the end of the building base material 12b as shown in Fig. 3(b). More specifically, for example, a gap formed between the end faces of the facing materials can be mentioned. Among these, it is preferable that at least one of the building base materials 11a and 11b or at least one of the building base materials 12a and 12b is the above-mentioned facing material, and it is more preferable to form the gap 30 between the end portions (end faces) of the facing materials constituting the building base materials 11a and 12a and the end portions (end faces) of the facing materials constituting the building base materials 11b and 12b. As a method of forming the gap 30 between a plurality of building base materials 11a and 11b or between building base materials 12a and 12b, for example, it can be formed by butting different building base materials 11a and 11b or building base materials 12a and 12b against each other, or bringing the building base materials 11a and 11b or building base materials 12a and 12b close to each other. By making the gap 30 formed by butting or bringing close a plurality of building base materials 11a and 11b or building base materials 12a and 12b, the width W can be narrowed, and it becomes easier to ensure the fire resistance in the gap 30.

[0075] Further, the gap 30 may be a hole provided in one building base material. In that case, the building base materials 11a, 11b or 12a, 12b are formed by the holes that are the gaps 30. The gap 30 formed by the holes provided in the building base materials 11a, 11b or 12a, 12b can be provided at a desired location, and the comfort in the building can be improved.

[0076] In the urethane filling structure where the communication direction in the gap 30 is the vertical direction, as a construction method of the urethane foams 21a, 21b for filling and closing the gap 30, discharge filling of a liquid urethane resin composition is preferable. Specifically, discharge filling using a spray and a caulking gun is preferred. Specifically, it is preferable to discharge a liquid urethane resin composition into the gap 30 of the pre-installed building base materials 11a, 11b or 12a, 12b and cure it to form the urethane foam 21a or the urethane foam 21b, thereby closing the gap 30. Alternatively, discharge a liquid urethane resin composition onto either one of the pre-installed building base materials 11a, 11b or 12a, 12b, and bring the other different building base material 11a, 11b or 12a, 12b into contact or close proximity before the urethane resin composition cures. Then, it is preferable to form the urethane foam 21a or the urethane foam 21b by curing the urethane resin composition to close the gap 30. Alternatively, after discharging a liquid urethane resin composition onto either one of the pre-installed building base materials 11a, 11b or 12a, 12b and curing it, the other different building base material 11a, 11b or 12a, 12b can be pressed against the urethane foams 21a, 21b. Although it can be expected to close the gap 30 by deforming the urethane foams 21a, 21b, if the degree of closure is insufficient, additional construction of the urethane foams 21a, 21b may be carried out.

[0077] According to the urethane filling structure according to the third embodiment, when the building base material constitutes a hollow floor, a fireproof structure excellent in fire resistance can be obtained by closing the gaps at both ends of the building base material with urethane foam. Further, since the urethane foam can be formed by discharge filling using a spray and a caulking gun, the workability is good.

[0078] [First Modification of the Third Embodiment] As a first modification of the third embodiment, as shown in FIG. 4, not only the gap 30 at both ends of the building base materials 11a and 11b is closed with the urethane foam 21a, but also the gap 30 at both ends of the building base materials 12a and 12b is closed with the urethane foam 21b. That is, the urethane filling structure according to the first modification of the third embodiment closes the gaps 30 on both sides of the hollow floor formed by the building base materials 11a and 11b and the building base materials 12a and 12b with the urethane foams 21a and 21b.

[0079] According to the urethane filling structure according to the first modification of the third embodiment, a fireproof structure more excellent in fire resistance can be obtained by closing the gaps with urethane foam on both sides of the hollow floor formed by the building base material.

[0080] [Second Modification of the Third Embodiment] As a second modification of the third embodiment, as shown in FIGS. 5(a) and 5(b), it further includes a backing material 41 provided in the gap 30 and serving as the basis for the urethane foam 21a or the urethane foam 21b. The urethane foam 21a or the urethane foam 21b in the second modification of the third embodiment is provided on both sides of the backing material 41. Hereinafter, the differences between the second modification of the third embodiment and the third embodiment will be described. Also, hereinafter, in the description of different embodiments, members having the same configuration are given the same reference numerals.

[0081] Since the applicator material 41 remains in the urethane foam 21a or urethane foam 21b even after receiving the filling material by discharge filling, it is preferable to adopt a non-combustible material that can impart a function to the urethane foam 20a or urethane foam 21b. The applicator material 41 is preferably a fibrous material from the viewpoints of followability to the installation location and workability. Also, the applicator material 41 can adopt a plate-shaped member. Since the applicator material 41 is a plate-shaped member, the liquid urethane resin composition can be received well. The applicator material 41 which is a plate-shaped member is preferably a slanted surface, a surface perpendicular to the axial direction, or a combination thereof with respect to the communication direction in the gap 30, and more preferably includes a perpendicular surface from the viewpoint of receiving the filling material well.

[0082] The thickness of the urethane foam 21a or urethane foam 21b in the communication direction of the gap 30 is the thickness T from the applicator material 41 1 and the thickness T 2 and the sum thereof. The thickness T 1 and the thickness T 2 The sum is preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less from the above viewpoints. Also, the thickness T 1 ,T 2 of the urethane foam 21a or urethane foam 21b in the communication direction of the gap 30 is preferably 15 mm or more and 150 mm or less, more preferably 20 mm or more and 125 mm or less, and even more preferably 25 mm or more and 100 mm or less.

[0083] According to the urethane filling structure according to the second modification of the third embodiment, by providing the applicator material, the installation of the urethane foam becomes easy, the gap can be more reliably closed with the urethane foam, and a fireproof structure with excellent fire resistance can be obtained. Also, by providing the applicator material, the gap generated when the building base material is installed can be easily closed with the urethane foam, and the workability becomes good.

[0084] [Third Modification of the Third Embodiment] As a third modification of the third embodiment, as shown in FIGS. 6(a) and 6(b), it further includes a backing material 41 provided in the gap 30 and serving as the basis for the urethane foam 21a or the urethane foam 21b. The urethane foam 21a or the urethane foam 21b in the third modification of the third embodiment is provided on one surface of the backing material 41. Hereinafter, the differences between the third modification of the third embodiment and the third embodiment will be described. Also, hereinafter, in the description of different embodiments, members having the same configuration are denoted by the same reference numerals.

[0085] Since the backing material 41 remains in the urethane foam 21a or the urethane foam 21b even after receiving the filling material by discharge filling, it is preferable to adopt a non-combustible material that can impart a function to the urethane foam 20a or the urethane foam 21b. The backing material 41 is preferably a fibrous material from the viewpoints of followability to the installation location and workability. Also, the backing material 41 can adopt a plate-like member. Since the backing material 41 is a plate-like member, it can favorably receive the liquid urethane resin composition. The backing material 41 that is a plate-like member is preferably an inclined surface, a surface perpendicular to the axial direction, or a combination thereof with respect to the communication direction in the gap 30, and more preferably includes a perpendicular surface from the viewpoint of favorably receiving the filling material.

[0086] The thickness T of the urethane foam 21a from the backing material 41 in the communication direction of the gap 30 1 and the thickness T of the urethane foam 21b from the backing material 41 2 are preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less from the above viewpoints.

[0087] According to the urethane filling structure according to the third modification of the third embodiment, by providing the backing material, the installation of the urethane foam becomes easy, the gap can be more reliably closed with the urethane foam, and a fireproof structure excellent in fire resistance can be achieved. Further, by providing the backing material, the gap generated when the building base material is installed can be easily closed with the urethane foam, and the workability is improved.

[0088] [Fourth Modification of the Third Embodiment] As a fourth modification of the third embodiment, as shown in FIG. 7, it is provided in the gap 30 and further includes a backing material 41 that serves as a base for the urethane foam 21a and the urethane foam 21b. The urethane foam 21a or the urethane foam 21b in the fourth modification of the third embodiment is provided on one surface of the backing material 41, and closes the gaps 30 on both sides of the hollow floor formed by the building base materials 11a, 11b and the building base materials 12a, 12b with the urethane foams 21a, 21b. Hereinafter, the differences between the fourth modification of the third embodiment and the third modification of the third embodiment will be described. Also, hereinafter, in the description of different embodiments, members having the same configuration are denoted by the same reference numerals.

[0089] The urethane foam 21a and the urethane foam 21b in the fourth modification of the third embodiment are provided only on the first space A side and the second space B side from the backing material 41 in the gaps 30 on both sides of the hollow floor formed by the building base materials 11a, 11b and the building base materials 12a, 12b. Since the urethane foam 21a and the urethane foam 21b close the gaps 30 on both sides of the hollow floor formed by the building base materials 11a, 11b and the building base materials 12a, 12b, sufficient fire resistance can be achieved by providing them only on the first space A side and the second space B side.

[0090] The thickness T of the urethane foam 21a from the backing material 40 in the communication direction of the gap 30 1 and the thickness T of the urethane foam 21b from the backing material 40 2From the above viewpoints, it is preferably 15 mm or more and 150 mm or less, more preferably 20 mm or more and 125 mm or less, and even more preferably 25 mm or more and 100 mm or less.

[0091] According to the urethane filling structure according to the fourth modification of the third embodiment, by providing the backing material, the installation of the urethane foam becomes easy, the gap can be more reliably closed with the urethane foam, and a fireproof structure excellent in fire resistance can be obtained. Further, by providing the backing material, the gap generated when the building base material is installed can be easily closed with the urethane foam, and the workability is improved.

[0092] [Fourth Embodiment] The difference between the fourth embodiment and the third embodiment is that, as shown in FIG. 8, another building base material 13 is provided in the gap 30 having the building base materials 11a, 11b and the building base materials 12a, 12b at both ends. Hereinafter, the difference between the fourth embodiment and the third embodiment will be described. Also, hereinafter, in the description of different embodiments, the same reference numerals are given to members having the same configuration.

[0093] The building base materials 11a and 12a are hollow floors as building members partitioning the upper and lower floors (the first space A and the second space B) of the building, and the building base materials 11b and 12b are hollow floors as building members partitioning the upper and lower floors (the third space C and the fourth space D) of the building. Specifically, the building base materials 11a, 11b in FIG. 8 are the upper floor side floors, and the building base materials 12a, 12b are the lower floor side ceilings. And the building base material 13 is a member such as a wall partitioning the spaces (the first space A and the third space C) (the second space B and the fourth space D) of the building. The building base materials 11a, 11b, the building base materials 12a, 12b, and the building base material 13 may be at least any one of the above-described facing materials, or all may be facing materials. The building base materials 11a, 11b, the building base materials 12a, 12b, and the building base material 13 can adopt the same materials as the building base materials 10a, 10b described in the first embodiment, so the details are the same as above and the description is omitted.

[0094] The urethane foam 22a forms a fireproof structure by filling and closing the gap 30 with the building base material 11a and the building base material 13 at both ends. The urethane foam 22b forms a fireproof structure by filling and closing the gap 30 with the building base material 11b and the building base material 13 at both ends. Since the urethane foams 22a and 22b can adopt the same materials as the urethane foam 20 described in the first embodiment, the details are the same as above and the description is omitted.

[0095] The width W of the gap 30 closed by the urethane foam 22a 3 and the width W of the gap 30 closed by the urethane foam 22b 4 From the above viewpoints, it is preferably 1 mm or more and 50 mm or less, more preferably 3 mm or more and 45 mm or less, and even more preferably 5 mm or more and 40 mm or less.

[0096] The thickness T of the urethane foam 22a in the communication direction of the gap 30 3 and the thickness T of the urethane foam 22b 4 From the above viewpoints, it is preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less.

[0097] The gap 30 is preferably a gap formed between the plurality of building base materials 11a and 13 or between the plurality of building base materials 11b and 13. Examples of the gap formed between the plurality of building base materials 11a and 13 or between the plurality of building base materials 11b and 13 include, for example, as shown in FIG. 8, a gap formed between the surface of the building base material 13 and the end of the building base material 11a, and a gap formed between the surface of the building base material 13 and the end of the building base material 11b. As a method of forming a gap 30 between a plurality of building base materials 11a and 13, or between a plurality of building base materials 11b and 13, for example, on the surface of the building base material 13, different building base materials 11a and 11b can be butted against each other, or formed by bringing the building base materials 11a and 11b close to each other. By making the gap 30 formed by butting or bringing close different building base materials 11a and 11b on the surface of the building base material 13, the width W 3 and the width W 4 can be narrowed, and it becomes easier to ensure the fire resistance in the gap 30.

[0098] As a method of applying the urethane foams 22a and 22b for closing the gap 30, first, a liquid urethane resin composition is discharged into the gap 30 having the building base material 11a and the building base material 13 at both ends, and the urethane foam 22a is formed by curing or drying, and the gap 30 having the building base material 11a and the building base material 13 at both ends can be closed. Then, it is preferable to discharge a liquid urethane resin composition into the gap 30 having the building base material 11b and the building base material 13 at both ends, and form the urethane foam 22b by curing or drying to close the gap 30 having the building base material 11b and the building base material 13 at both ends. Alternatively, a method of applying the urethane foam 22a or the urethane foam 22b to the building material 13 and pressing the building material 11a or the building material 11b against the urethane foam 22a or the urethane foam 22b after curing may be combined. Although it can be expected to close the gap 30 by deforming the urethane foams 22a and 22b, if the degree of closure is insufficient, the urethane foams 22a and 22b may be additionally applied.

[0099] According to the urethane filling structure according to the fourth embodiment, even when the building base material constitutes a hollow floor and another building base material is provided between the hollow floors, a fireproof structure excellent in fire resistance can be obtained by closing the gap having the building base material at both ends with the urethane foam. Further, since the urethane foam can be formed by discharge filling using a spray and a caulking gun, the workability is good.

[0100] [Modification of the Fourth Embodiment] As a modification of the fourth embodiment, as shown in FIG. 9, not only the gap 30 is closed with the urethane foams 22a and 22b, but also the gap 30 having the building base material 12a and the building base material 13 at both ends and the gap 30 having the building base material 12b and the building base material 13 at both ends are closed. That is, the urethane filling structure according to the modification of the fourth embodiment closes the gaps 30 on both sides of the hollow floor formed by the building base materials 11a, 11b, the building base materials 12a, 12b, and the building base material 13 with the urethane foams 22a, 22b and the urethane foams 23a, 23b.

[0101] The urethane foam 23a forms a fireproof structure by filling and closing the gap 30 having the building base material 12a and the building base material 13 at both ends. The urethane foam 23b forms a fireproof structure by filling and closing the gap 30 having the building base material 12b and the building base material 13 at both ends. Since the urethane foams 23a and 23b can adopt the same materials as the urethane foam 20 described in the first embodiment, the details are the same as above and the description is omitted.

[0102] The width W of the gap 30 closed by the urethane foam 23a 5 and the width W of the gap 30 closed by the urethane foam 23b 6 From the above viewpoints, it is preferably 1 mm or more and 50 mm or less, more preferably 3 mm or more and 45 mm or less, and even more preferably 5 mm or more and 40 mm or less.

[0103] The thickness T of the urethane foam 23a in the communication direction of the gap 30 5 and the thickness T of the urethane foam 23b 6 From the above viewpoints, it is preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less.

[0104] According to the urethane filling structure according to the modification of the fourth embodiment, even when the building base material constitutes a hollow floor and another building base material is provided between the hollow floors, gaps are closed with urethane foam on both sides of the hollow floor constituted by the building base material, thereby enabling a fireproof structure with better fire resistance.

[0105] [Fifth Embodiment] The difference between the fifth embodiment and the first embodiment is that, as shown in FIG. 10, the insertion member 50 is passed through different spaces using the respective gaps 30 having the building base materials 14a and 14b at both ends. Hereinafter, the differences between the fifth embodiment and the first embodiment will be described. Also, hereinafter, in the description of different embodiments, members having the same configuration will be given the same reference numerals.

[0106] The insertion member 50 is a linear member that transmits electricity or light, and examples include wirings such as power cables and communication cables. The insertion member 50 has a transmission line main body that transmits electricity or light and an outer skin that covers the transmission line main body. Examples of the material of the transmission line main body include metal materials such as copper, copper alloy, aluminum, and aluminum alloy. Examples of the material of the outer skin include resin materials such as polyvinyl chloride (PVC), polyethylene (PE), and crosslinked polyethylene, and are provided around the transmission line main body by extrusion molding or the like. Further, the insertion member 50 may further have an outer tube that protects the transmission line main body and the outer skin. Examples of the outer tube include corrugated tubes and spiral tubes formed of resin materials such as PVC, PE, polypropylene (PP), and polybutadiene (PB), and sheets formed of metal foils or the like.

[0107] The building base materials 14a and 14b are members that partition a first space A for passing the insertion member 50 through different spaces of the building, a second space B which is an indoor space through which the insertion member 50 passes, and a third space C. Specifically, the building base materials 14a and 14b in FIG. 10 are the floor and walls, etc., and constitute underfloor piping and in-wall piping, etc. The underfloor piping and in-wall piping, etc. formed by the building base materials 14a and 14b can be formed, for example, by a sub-duct method using wiring ducts. And the building base material 15 is a member such as a wall that partitions the spaces (the second space B and the third space C) of the building. Since the building base materials 14a, 14b and the building base material 15 can adopt the same materials as the building base materials 10a, 10b described in the first embodiment, the details are the same as above and the description is omitted.

[0108] The urethane foams 24a and 24b form a fireproof structure by filling and closing the gaps 30 with the building base materials 14a and 14b at both ends. Since the urethane foams 24a and 24b can adopt the same materials as the urethane foam 20 described in the first embodiment, the details are the same as above and the description is omitted.

[0109] The width W of the gap 30 closed by the urethane foam 24a 10 and the width W of the gap 30 closed by the urethane foam 24b 11 From the above viewpoints, it is preferably 1 mm or more and 50 mm or less, more preferably 3 mm or more and 45 mm or less, and even more preferably 5 mm or more and 40 mm or less.

[0110] The thickness T of the urethane foam 24a in the communication direction of the gap 30 10 and the thickness T of the urethane foam 24b 11 From the above viewpoints, it is preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less.

[0111] In the urethane filling structure including the insertion member 50, as a construction method of the urethane foams 24a and 24b for closing the gap 30, first, the insertion member 50 is arranged through the gap 30, and then a liquid urethane resin composition is discharged into each gap 30. By the urethane resin composition being cured or dried, it is preferable to form the urethane foams 24a and 24b containing the insertion member 50 and close the gap 30.

[0112] According to the urethane filling structure according to the fifth embodiment, even in a configuration where an insertion member such as wiring is passed through using a gap, the gap can be closed with a urethane foam, and a fireproof structure excellent in fire resistance can be obtained.

[0113] [Sixth Embodiment] The difference between the sixth embodiment and the first embodiment is that, as shown in FIG. 11, an insertion member 60 is passed through different spaces by using a gap 30 formed by forming holes in building base materials 16a and 16b which are partition members such as walls, and the partition penetration portions provided in the building base materials 16a and 16b are closed with a urethane foam 25a. Hereinafter, the differences between the sixth embodiment and the first embodiment will be described. Also, hereinafter, in the description of different embodiments, members having the same configuration are denoted by the same reference numerals.

[0114] The insertion member 60 is a pipe or the like for transporting fluids such as liquids, gases, and powders. The material of the insertion member 60 is not particularly limited, but it is preferably excellent in fire resistance. For example, metal materials such as iron, lead, copper, copper alloy, aluminum, and aluminum alloy can be mentioned. Further, when a resin material or the like having low fire resistance is adopted as the material of the insertion member 60, from the viewpoint of imparting fire resistance, it is preferable to arrange mortar, metal, etc. When the insertion member 60 is composed only of a pipe made of a resin material, from the viewpoint of obtaining fire resistance, the pipe thickness is preferably 2 mm or more, more preferably 4 mm or more, and further preferably 6 mm or more.

[0115] The building base materials 16a and 16b are members such as walls that partition the space of a building (the first space A and the second space B). Since the building base materials 16a and 16b can adopt the same materials as the building base materials 10a and 10b described in the first embodiment, the details are the same as above and the description is omitted.

[0116] The urethane foam 25a forms a fireproof structure by filling and closing the gaps 30 with the building base materials 16a and 16b at both ends. Since the urethane foam 25a can adopt the same materials as the urethane foam 20 described in the first embodiment, the details are the same as above and the description is omitted.

[0117] The width W of the gap 30 closed by the urethane foam 25a 7 From the above viewpoints, it is preferably 2 mm or more and 100 mm or less, more preferably 6 mm or more and 90 mm or less, and even more preferably 10 mm or more and 80 mm or less.

[0118] When the insertion member 60 has fire resistance, the insertion member 60 can be regarded as a part constituting the gap 30, and the gap 30 closed by the urethane foam 25a can be regarded as having the insertion member 60 and either the building base materials 16a and 16b at both ends. The width W of the gap 30 closed by the urethane foam 25a when the insertion member 60 has excellent fire resistance 7a From the above viewpoints, it is preferably 1 mm or more and 50 mm or less, more preferably 3 mm or more and 45 mm or less, and even more preferably 5 mm or more and 40 mm or less.

[0119] The thickness T of the urethane foam 25a in the communication direction of the gap 30 7 From the above viewpoints, it is preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less.

[0120] In the urethane filling structure including the insertion member 60, as a construction method of the urethane foam 25a for closing the gap 30, first, the insertion member 60 is disposed through the gap 30, and then a liquid urethane resin composition is discharged into the gap 30. By curing or drying, a urethane foam 25a containing the insertion member 60 is formed, and it is preferable to close the gap 30.

[0121] According to the urethane filling structure according to the sixth embodiment, even in a configuration in which an insertion member is passed through by utilizing a gap formed by forming a hole in a building base material which is a partition member such as a wall, the gap can be closed with a urethane foam, and a fireproof structure excellent in fire resistance can be obtained.

[0122] [First Modification of the Sixth Embodiment] As a first modification of the sixth embodiment, as shown in FIG. 12, not only one of the gaps 30 having the building base materials 16a and 16b at both ends is closed with the urethane foam 25a, but the other of the gaps 30 having the building base materials 16a and 16b at both ends is closed with the urethane foam 25b. That is, the urethane filling structure according to the first modification of the sixth embodiment closes both sides of the gap 30 formed by the building base materials 16a and 16b with the urethane foams 25a and 25b.

[0123] Width W of the gap 30 closed by the urethane foam 25b 8 From the above viewpoints, it is preferably 2 mm or more and 100 mm or less, more preferably 6 mm or more and 90 mm or less, and even more preferably 10 mm or more and 80 mm or less.

[0124] When the insertion member 60 has fire resistance, the insertion member 60 can be regarded as a part constituting the gap 30, and the gap 30 closed by the urethane foam 25b can be regarded as having either the insertion member 60 or the building base materials 16a and 16b at both ends. Width W of the gap 30 closed by the urethane foam 25b in the case where the insertion member 60 has excellent fire resistance 8aFrom the above viewpoints, it is preferably 1 mm or more and 50 mm or less, more preferably 3 mm or more and 45 mm or less, and even more preferably 5 mm or more and 40 mm or less.

[0125] The thicknesses of the urethane foams 25a and 25b in the communication direction of the gap 30 are the thickness T of the urethane foam 25a 7 and the thickness T of the urethane foam 25b 8 which are totaled. The thickness T 7 and the thickness T 8 The total of them is preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less from the above viewpoints. Further, the thickness T of the urethane foam 25a 1 and the thickness T of the urethane foam 25b 2 are preferably 15 mm or more and 150 mm or less, more preferably 20 mm or more and 125 mm or less, and even more preferably 25 mm or more and 100 mm or less.

[0126] In the urethane filling structure including the insertion member 60, as a construction method of the urethane foams 25a and 25b for closing the gap 30, first, the insertion member 60 is arranged through the gap 30. Then, a liquid urethane resin composition is discharged from one side of the gap 30, and the urethane foam 25a containing the insertion member 60 is formed by curing or drying to close the gap 30 on one side. And then, it is preferable to discharge a liquid urethane resin composition from the other side of the gap 30 and form the urethane foam 25b containing the insertion member 60 by curing or drying to close the gap 30 on the other side.

[0127] According to the urethane filling structure according to the first modification of the sixth embodiment, by closing both sides of the gap formed by the building base material with urethane foams, a fireproof structure having more excellent fire resistance can be obtained.

[0128] [Second Modification of the Sixth Embodiment] As a second modification of the sixth embodiment, as shown in FIG. 13, with respect to the gap 30 having the building base materials 16a and 16b at both ends, the entire inside of the gap 30 is filled and blocked by the urethane foam 26. That is, the urethane filling structure according to the second modification of the sixth embodiment blocks both sides and the inside of the gap 30 formed by the building base materials 16a and 16b with the urethane foam 26.

[0129] The width W of the gap 30 blocked by the urethane foam 26 9 From the above viewpoints, it is preferably 2 mm or more and 100 mm or less, more preferably 6 mm or more and 90 mm or less, and even more preferably 10 mm or more and 80 mm or less.

[0130] When the outer layer of the insertion member 60 is made of a non-combustible material, the insertion member 60 can be regarded as a part of the gap 30, and the gap 30 blocked by the urethane foam 26 can be regarded as having the insertion member 60 and either one of the building base materials 16a and 16b at both ends of the building base material. The width W of the gap 30 blocked by the urethane foam 26 when the insertion member 60 has excellent fire resistance 9a From the above viewpoints, it is preferably 1 mm or more and 50 mm or less, more preferably 3 mm or more and 45 mm or less, and even more preferably 5 mm or more and 40 mm or less.

[0131] The thickness T of the urethane foam 26 in the communication direction of the gap 30 9 From the above viewpoints, it is preferably 30 mm or more and 300 mm or less, more preferably 40 mm or more and 275 mm or less, and even more preferably 50 mm or more and 250 mm or less.

[0132] In the urethane filling structure including the insertion member 60, as a method for constructing the urethane foam 26 for closing the gap 30, first, the insertion member 60 is disposed through the gap 30. Then, a liquid urethane resin composition is discharged from one side of the gap 30, and after allowing the filler to spread to the other side of the gap 30, the urethane foam 26 is formed by curing or drying. It is preferable that the urethane foam 26 closes both sides and the inside of the gap 30. Also, in the urethane filling structure including the insertion member 60, as a method for constructing the urethane foam 26 for closing the gap 30, first, the insertion member 60 is disposed through the gap 30. Then, a liquid urethane resin composition is discharged from one side of the gap 30, and a part of the urethane foam 26 that encloses the insertion member 60 is formed by curing or drying. Then, a liquid urethane resin composition is discharged from the other side of the gap 30, filled up to a part of the urethane foam 26 that has already been formed, and the filler is cured or dried to form the urethane foam 26 that encloses the insertion member 60. It is preferable that the urethane foam 26 closes both sides and the inside of the gap 30.

[0133] According to the urethane filling structure according to the second modification of the sixth embodiment, by closing both sides and the inside of the gap formed by the building base material with urethane foam, a fireproof structure with more excellent fire resistance can be achieved.

[0134] [Seventh Embodiment] The difference between the seventh embodiment and the sixth embodiment is that, as shown in FIG. 14, it further includes a backing material 42 provided in the gap 30 and serving as the basis for the urethane foam 25a. Hereinafter, the differences between the seventh embodiment and the sixth embodiment will be described. Also, hereinafter, in the description of different embodiments, members having the same configuration are denoted by the same reference numerals.

[0135] The filler 42 receives the liquid urethane resin composition and contributes to closing the gap 30 as the basis of the urethane foam 25a. The filler 42 is preferably a slanted surface, a surface perpendicular to the axial direction, or a combination thereof with respect to the communication direction in the gap 30, and more preferably includes a perpendicular surface from the viewpoint of favorably receiving the filler.

[0136] Since the filler 42 remains in the urethane foam 25a even after receiving the filler by discharge filling, it is preferable to employ a non-combustible material that can impart a function to the urethane foam 25a. Since the filler 42 can employ the same material as the filler 40 described in the second embodiment, the details thereof are the same as above and the description thereof is omitted.

[0137] A hole 42a is open near the center of the bottom of the filler 42, and the insertion member 60 passes through the hole 42a. The hole 42a may be circular, but may have any shape other than circular according to the shape of the insertion member 60. The hole 42a may be smaller than the size of the insertion member 60. Further, instead of the hole 42a, a notch may be provided. Even if the size of the hole 42a is smaller than the insertion member 60 or a notch is provided instead of the hole 42a, when the filler 42 is formed of a rubber or resin material, when the insertion member 60 is inserted into the hole 42a (or notch), the bottom bends and the insertion member 60 can be inserted into the hole 42a (or notch).

[0138] In the urethane filling structure including the filler 42, as a construction method of the urethane foam 25a for closing the gap 30, first, the filler 42 is disposed in the gap 30, and the insertion member 60 is disposed through the hole 42a provided at the bottom of the filler 42. Thereafter, it is preferable to discharge the liquid urethane resin composition into the gap 30, and form the urethane foam 25a in which the filler 42 receives the filler and the insertion member 60 is incorporated by curing or drying to close the gap 30.

[0139] According to the urethane filling structure according to the seventh embodiment, even if the structure is configured to pass the insertion member using the gap, the gap can be closed with urethane foam, and a fireproof structure with excellent fire resistance can be achieved. Moreover, according to the urethane filling structure according to the seventh embodiment, by providing the backing material, the gap can be more reliably closed with urethane foam, and a fireproof structure with excellent fire resistance can be achieved.

[0140] [Modification Example of the Seventh Embodiment] As a modification example of the seventh embodiment, as shown in FIG. 15, not only is the gap 30 with the building base materials 16a and 16b at both ends closed with urethane foam 25a based on the backing material 42 from one side of the gap 30, but also the gap 30 with the building base materials 16a and 16b at both ends is closed with urethane foam 25b based on the backing material 42 from the other side of the gap 30. That is, the urethane filling structure according to the modification example of the seventh embodiment is closed by urethane foams 25a and 25b based on the backing material 42 on both sides of the gap 30 formed by the building base materials 16a and 16b.

[0141] In the urethane filling structure including the backing material 42 and the insertion member 60, as a construction method of the urethane foams 25a and 25b for closing the gap 30, first, the backing material 42 is arranged in the gap 30, and the insertion member 60 is arranged through the hole 42a at the bottom of the backing material 42. Then, a liquid urethane resin composition is discharged from one side of the gap 30, and the backing material 42 receives the filling material and cures or dries to form the urethane foam 25a that houses the insertion member 60. And it is preferable to discharge a liquid urethane resin composition from the other side of the gap 30, and for the backing material 42 to receive the filling material and cure or dry to form the urethane foam 25b that houses the insertion member 60, thereby closing the gap 30.

[0142] According to the urethane filling structure according to the modification example of the seventh embodiment, by providing the backing material, both sides of the gap formed by the building base material can be more reliably closed with urethane foam, and a fireproof structure with more excellent fire resistance can be achieved.

Explanation of Reference Numerals

[0143] 10 - 16... Building substrate 20 - 25... Urethane foam 30... Gap 40 - 42... Lining material 50, 60... Insertion member

Claims

Claim 1 A plurality of building base materials having non-combustible materials, and a urethane foam that closes a gap formed between the plurality of building base materials, wherein the urethane foam contains a filler, wherein the plurality of building base materials are facing materials that constitute at least a part of a ceiling, wall, or floor of a building, wherein the gap is formed between a surface of one building base material and an end of the other building base material, or between an end of one building base material and an end of the other building base material, wherein the gap is provided with a backing material disposed so as to span between the one building base material and the other building base material, and the urethane foam contacts the building base material and the backing material to close the gap, a urethane filling structure. Claim 2 The urethane filling structure according to claim 1, wherein the urethane foam is adhered to the building base material. Claim 3 The urethane filling structure according to claim 1 or 2, wherein the thickness of the urethane foam in the communication direction of the gap is 30 mm or more and 300 mm or less. Claim 4 The urethane filling structure according to any one of claims 1 to 3, wherein the width of the gap is 1 mm or more and 100 mm or less. Claim 5 The urethane filling structure according to any one of claims 1 to 4, wherein the width of the gap is 1 mm or more and 50 mm or less.

Images