JP7423057B2 - Fireproof structure of wooden buildings and its construction method - Google Patents

Fireproof structure of wooden buildings and its construction method Download PDF

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JP7423057B2
JP7423057B2 JP2020061847A JP2020061847A JP7423057B2 JP 7423057 B2 JP7423057 B2 JP 7423057B2 JP 2020061847 A JP2020061847 A JP 2020061847A JP 2020061847 A JP2020061847 A JP 2020061847A JP 7423057 B2 JP7423057 B2 JP 7423057B2
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絵美 服部
聖世 勝野
圭一 加藤
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三商株式会社
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本発明は、木造建築物の耐火構造及びそれに用いる木質構造部材に関する。 The present invention relates to a fireproof structure of a wooden building and a wooden structural member used therein.

従来、木造建築物の耐火構造としては例えば、荷重を支持する集成材からなる芯材と、芯材の外側に設けられ、吸熱性および断熱性を有する無機質材料からなる第2燃え止まり層と、第2燃え止まり層の外側に設けられ、加熱により増厚して断熱性を発現するシート状の第1燃え止まり層と、第1燃え止まり層の外側に設けられる仕上げ材とを備えるようにする構造(特許文献1参照。)や、荷重を支持する木質材料からなると、芯材の外側に設けられる空気層と、空気層の外側に設けられる吸熱性および断熱性を有する無機質材料と、無機質材料の外側に設けられる耐火被覆材と、耐火被覆材の外側に設けられる仕上げ材とを備えるようにする構造(特許文献2参照。)がある。 Conventionally, the fireproof structure of a wooden building includes, for example, a core material made of laminated wood that supports the load, a second fire stopper layer provided outside the core material and made of an inorganic material that has heat absorbing and heat insulating properties. The first flame stopper layer is provided on the outside of the second firestop layer, and includes a sheet-like first firestop layer that is thickened by heating to exhibit heat insulating properties, and a finishing material that is provided on the outside of the first firestop layer. When the structure (see Patent Document 1) is made of a wood material that supports the load, there is an air layer provided outside the core material, an inorganic material with heat absorbing and heat insulating properties provided outside the air layer, and an inorganic material. There is a structure (see Patent Document 2) that includes a fireproof coating provided on the outside of the fireproof coating and a finishing material provided on the outside of the fireproof coating.

しかし、これらの構造は、柱、梁、壁等の荷重支持部材を火災時の燃焼熱から保護するために厚い被覆をする必要があり、結果的に構造の断面積が大きくなって建築物の重量が増し、建物内の有効面積が低減してしまうという課題がある。 However, these structures require thick coatings to protect load-bearing members such as columns, beams, and walls from combustion heat during a fire, resulting in an increase in the cross-sectional area of the structure and There are problems in that the weight increases and the effective area within the building decreases.

特開2015-129431号公報Japanese Patent Application Publication No. 2015-129431 特開2017-179889号公報Japanese Patent Application Publication No. 2017-179889

解決しようとする問題点は、断面積の小さな木造建築物の耐火構造を提供する点である。 The problem to be solved is to provide a fireproof structure for wooden buildings with small cross-sectional areas.

本発明の木造建築物の耐火構造は、(1)木造建築物の荷重を支持する荷重支持木材と、(2)該荷重支持木材の外側に設けられたシート状無機繊維層と、(3)該シート状無機繊維層の外側に設けられた輻射熱を反射する輻射熱反射層と、(4)該輻射熱反射層の外側に設けられた200℃以上で発泡して断熱性を発現する加熱発泡層と、(5)該加熱発泡層の外側に設けられた化粧材とを備えることを最も主要な特徴とする。 The fireproof structure of a wooden building according to the present invention includes (1) a load-bearing wood that supports the load of the wooden building, (2) a sheet-like inorganic fiber layer provided on the outside of the load-supporting wood, and (3) (4) a radiant heat reflective layer provided on the outside of the sheet-like inorganic fiber layer to reflect radiant heat; and (4) a heated foaming layer provided on the outside of the radiant heat reflective layer that foams at 200° C. or higher to exhibit heat insulating properties. , and (5) a decorative material provided on the outside of the heat-foamed layer.

本発明の木造建築物の耐火構造によれば、断面積の小さな耐火構造(柱、梁、壁等)を得られるという利点がある。 According to the fireproof structure of a wooden building of the present invention, there is an advantage that a fireproof structure (columns, beams, walls, etc.) with a small cross-sectional area can be obtained.

本発明の耐火構造(柱)の例を示した断面図である。1 is a sectional view showing an example of a fireproof structure (column) of the present invention. 本発明の耐火構造(壁)の例を示した断面図である。1 is a sectional view showing an example of a fireproof structure (wall) of the present invention. 本発明の耐火構造(梁)の例を示した断面図である。1 is a sectional view showing an example of a fireproof structure (beam) of the present invention.

本発明の木造建築物の耐火構造1は、例えば以下のようなものである。
図1に示すように木造建築物の荷重を支持する(1)荷重支持木材2としての断面寸法300mm×300mmのスギ集成材(柱)と、(2)該スギ集成材の外側に設けられたシート状無機繊維層3としての厚さ1.5mmのシート状ロックウールと、(3)該シート状ロックウールの外側に設けられた輻射熱を反射する輻射熱反射層4としての厚さ20μmのアルミニウムはくと、(4)該アルミニウムはくの外側に設けられた200℃以上で発泡して断熱性を発現する加熱発泡層としての厚さ5mmのポリリン酸アンモニウムと酢酸ビニル共重合樹脂とを含有するシートと、(5)該発泡形耐火被覆シートの外側に設けられた化粧材5としての厚さ19mmのヒノキ製材とが備えられている。
The fireproof structure 1 for a wooden building according to the present invention is, for example, as follows.
As shown in Figure 1, (1) a cedar laminated timber (column) with cross-sectional dimensions of 300 mm x 300 mm as the load-bearing timber 2, and (2) a cedar laminated timber installed on the outside of the cedar laminated timber to support the load of a wooden building, as shown in Figure 1. (3) Sheet-like rock wool with a thickness of 1.5 mm as the sheet-like inorganic fiber layer 3, and (3) aluminum with a thickness of 20 μm as the radiant heat reflecting layer 4 provided on the outside of the sheet-like rock wool to reflect radiant heat. (4) Contains ammonium polyphosphate and vinyl acetate copolymer resin with a thickness of 5 mm as a heat-foamed layer provided on the outside of the aluminum foil that foams at 200°C or higher to develop heat insulation properties. and (5) a cypress lumber with a thickness of 19 mm as a decorative material 5 provided on the outside of the foamed fireproof covering sheet.

前記荷重支持木材2としては、柱以外にも梁、壁、床等が挙げられる。
前記荷重支持木材2としては、スギに限らず任意の樹種を設定することができる。例えば、スギ、カラマツ、ヒノキ、イチイ等の針葉樹、サクラ、ケヤキ、ブナ、クヌギ、ナラ等の広葉樹が挙げられる。
Examples of the load-supporting wood 2 include beams, walls, floors, etc. in addition to columns.
The load-bearing wood 2 is not limited to cedar, but any tree species can be used. Examples include conifers such as cedar, larch, cypress, and yew, and broadleaf trees such as cherry, zelkova, beech, sawtooth oak, and oak.

前記荷重支持木材2としては、集成材に限らず任意に設定することができる。例えば、製材、単板積層板(LVL)、直交集成板(CLT)、合板等が挙げられる。 The load-supporting wood 2 is not limited to laminated wood, and can be arbitrarily set. Examples include sawn timber, veneer laminate (LVL), cross-laminated board (CLT), plywood, and the like.

前記荷重支持木材2には、リン酸、ホウ酸等の難燃薬剤を浸透させて難燃性を付与しても良い。 The load-bearing wood 2 may be impregnated with a flame retardant such as phosphoric acid or boric acid to impart flame retardancy.

前記荷重支持木材2の断面寸法は建築物に必要とされる荷重を指示するために必要な断面寸法を任意に設定することができる。 The cross-sectional size of the load-supporting timber 2 can be arbitrarily set to a cross-sectional size necessary to indicate the load required for the building.

前記シート状無機繊維層3は荷重指示木材の外側に設けられることが必要である。 The sheet-like inorganic fiber layer 3 needs to be provided on the outside of the load indicating wood.

前記シート状無機繊維層3は対流による伝熱を遅らせるために設けられ、シート状ロックウールに限らず、対流による伝熱を遅らせる効果のある材料であれば任意に設定することができる。例えば、セラミックファイバー、グラスウール等が挙げられる。前記無機繊維は紙すきの要領で抄造してシート状に成形して用いても良い。これらのうち、シート状ロックウールまたはセラミックファイバーを用いることが好ましい。前記セラミックファイバーはセラミックファイバーのバルクをシート状にしたものを用いることが好ましく、例えば、ニチアス株式会社のファインフレックスBIOペーパー、イソライト工業株式会社の1260ペーパーS、1600ペーパーイソウール、1260エースペーパー、イソウール1500エースペーパー等が挙げられる。シート状無機繊維を用いることにより、石こうボード、ケイ酸カルシウム板、難燃剤を浸透させた木材等を用いる場合に比べて耐火構造1の断面積を低減することができる。 The sheet-like inorganic fiber layer 3 is provided to retard heat transfer due to convection, and is not limited to sheet-like rock wool, but may be made of any material as long as it is effective in retarding heat transfer due to convection. Examples include ceramic fiber, glass wool, and the like. The inorganic fiber may be made into a sheet in the same manner as paper making and used. Among these, it is preferable to use sheet-like rock wool or ceramic fiber. The ceramic fiber is preferably a sheet made of bulk ceramic fiber, such as Fineflex BIO Paper from Nichias Co., Ltd., 1260 Paper S, 1600 Paper Isowool, 1260 Ace Paper, and Isowool 1500 from Isolite Industries Co., Ltd. Examples include Ace Paper. By using sheet-like inorganic fibers, the cross-sectional area of the fireproof structure 1 can be reduced compared to the case of using a gypsum board, a calcium silicate board, wood impregnated with a flame retardant, or the like.

前記シート状無機繊維層3の1層あたりの厚さは0.3~5.0mmであることが好ましく、0.5~3.0mmであることがより好ましく、0.7~2.0mmであることが最も好ましい。 The thickness per layer of the sheet-like inorganic fiber layer 3 is preferably 0.3 to 5.0 mm, more preferably 0.5 to 3.0 mm, and 0.7 to 2.0 mm. Most preferably.

前記シート状無機繊維層3の荷重支持木材2への固定方法は任意に設定することができる。例えば、接着剤、両面テープ、建築用ステープル、釘、ビス(以下、「タッカー」という。)等で固定しても良い。接着剤としてはシート状無機繊維層3を荷重支持木材2に接着するものであれば任意に設定することができる。例えば、エチレン酢酸ビニル樹脂接着剤、酢酸ビニル樹脂接着剤、アクリル樹脂接着剤、ポリビニルアルコール接着剤、ウレタン樹脂接着剤、エポキシ樹脂接着剤等が挙げられる。 The method of fixing the sheet-like inorganic fiber layer 3 to the load-supporting wood 2 can be arbitrarily set. For example, it may be fixed with adhesive, double-sided tape, construction staples, nails, screws (hereinafter referred to as "tackers"), etc. Any adhesive can be used as long as it adheres the sheet-like inorganic fiber layer 3 to the load-supporting wood 2. Examples include ethylene vinyl acetate resin adhesive, vinyl acetate resin adhesive, acrylic resin adhesive, polyvinyl alcohol adhesive, urethane resin adhesive, epoxy resin adhesive, and the like.

前記シート状ロックウールはロックウール繊維を抄造又は加圧等することによりシート状に成形したもので、結合材としてのポリビニルアルコール、アクリル樹脂、酢酸ビニル樹脂等の合成樹脂を含有させても良い。また、ガラス繊維等の他の無機繊維や水酸化アルミニウム等の結晶水を含有する無機材料を含有させても良い。 The sheet-shaped rock wool is formed into a sheet by paper-making or pressing rock wool fibers, and may contain a synthetic resin such as polyvinyl alcohol, acrylic resin, or vinyl acetate resin as a binding material. Further, other inorganic fibers such as glass fibers or inorganic materials containing crystal water such as aluminum hydroxide may be included.

前記輻射熱反射層4はシート状無機繊維層3の外側に設けられることが必要である。
前記輻射熱反射層4はアルミニウムはくに限らず、輻射熱を反射する材料であれば任意に設定することができる。例えば、金、銀、銅等の金属、酸化チタン、酸化マグネシウム等の白色酸化物が挙げられる。これらのうち、金属は金属箔の状態で用いることが好ましい。また、酸化チタン等の白色酸化物は塗料等の形態で用いることが好ましい。
The radiant heat reflecting layer 4 needs to be provided on the outside of the sheet-like inorganic fiber layer 3.
The radiant heat reflecting layer 4 is not limited to aluminum foil, but can be made of any material that reflects radiant heat. Examples include metals such as gold, silver, and copper, and white oxides such as titanium oxide and magnesium oxide. Among these, metals are preferably used in the form of metal foil. Further, it is preferable to use a white oxide such as titanium oxide in the form of a paint or the like.

前記輻射熱反射層4の厚さは好ましくは5~50μmであり、より好ましくは10~35μmであり、最も好ましくは15~30μmである。 The thickness of the radiant heat reflective layer 4 is preferably 5 to 50 μm, more preferably 10 to 35 μm, and most preferably 15 to 30 μm.

前記輻射熱反射層4のシート状無機繊維層3への固定方法は任意に設定することができる。例えば、接着剤、両面テープ、建築用ステープル、釘、ビス(以下、「タッカー」という。)等で固定しても良い。接着剤としてはシート状無機繊維層3を荷重支持木材2に接着するものであれば任意に設定することができる。例えば、エチレン酢酸ビニル樹脂接着剤、酢酸ビニル樹脂接着剤、アクリル樹脂接着剤、ポリビニルアルコール接着剤、ウレタン樹脂接着剤、エポキシ樹脂接着剤等が挙げられる。 The method of fixing the radiant heat reflective layer 4 to the sheet-like inorganic fiber layer 3 can be set arbitrarily. For example, it may be fixed with adhesive, double-sided tape, construction staples, nails, screws (hereinafter referred to as "tackers"), etc. Any adhesive can be used as long as it adheres the sheet-like inorganic fiber layer 3 to the load-supporting wood 2. Examples include ethylene vinyl acetate resin adhesive, vinyl acetate resin adhesive, acrylic resin adhesive, polyvinyl alcohol adhesive, urethane resin adhesive, epoxy resin adhesive, and the like.

前記輻射熱反射層4とシート状無機繊維層3とはあらかじめ積層させて用いることが好ましい。このように構成することにより、輻射熱反射層4を金属箔とした場合の施工性に優れる。 It is preferable that the radiant heat reflective layer 4 and the sheet-like inorganic fiber layer 3 are laminated in advance. This configuration provides excellent workability when the radiant heat reflective layer 4 is made of metal foil.

前記輻射熱反射層4とシート状無機繊維層3とは繰り返し積層しても良い。例えば、シート状無機繊維層/輻射熱反射層/シート状無機繊維層/輻射熱反射層、シート状無機繊維層/輻射熱反射層/シート状無機繊維層/輻射熱反射層/シート状無機繊維層/輻射熱反射層、シート状無機繊維層/輻射熱反射層/シート状無機繊維層/輻射熱反射層/シート状無機繊維層/輻射熱反射層/シート状無機繊維層/輻射熱反射層、シート状無機繊維層/輻射熱反射層/シート状無機繊維層、輻射熱反射層/シート状無機繊維層/輻射熱反射層等の構成が挙げられる。 The radiant heat reflective layer 4 and the sheet-like inorganic fiber layer 3 may be repeatedly laminated. For example, sheet-shaped inorganic fiber layer/radiant heat reflective layer/sheet-shaped inorganic fiber layer/radiant heat reflective layer, sheet-shaped inorganic fiber layer/radiant heat reflective layer/sheet-shaped inorganic fiber layer/radiant heat reflective layer/sheet-shaped inorganic fiber layer/radiant heat reflective layer layer, sheet-shaped inorganic fiber layer/radiant heat reflective layer/sheet-shaped inorganic fiber layer/radiant heat reflective layer/sheet-shaped inorganic fiber layer/radiant heat reflective layer/sheet-shaped inorganic fiber layer/radiant heat reflective layer, sheet-shaped inorganic fiber layer/radiant heat reflective layer Examples of the structure include layer/sheet-like inorganic fiber layer, radiant heat reflective layer/sheet-like inorganic fiber layer/radiant heat reflective layer.

前記加熱発泡層は輻射熱反射層4の外側に設けられることが必要である。 The heat-foaming layer needs to be provided on the outside of the radiant heat reflective layer 4.

前記加熱発泡層は火災時の燃焼熱により200℃以上で発泡してシート状無機繊維層3を形成するものであれば任意に設定することができる。例えば、ポリリン酸アンモニウムと合成樹脂とを含有するもの、膨張性黒鉛と合成樹脂とを含有するもの等が挙げられる。 The heat foaming layer can be arbitrarily set as long as it foams at 200° C. or higher due to combustion heat during a fire to form the sheet-like inorganic fiber layer 3. Examples include those containing ammonium polyphosphate and synthetic resin, and those containing expandable graphite and synthetic resin.

前記加熱発泡層の形態は任意に設定することができる。例えば、シート状、塗料状等が挙げられる。これらのうち、シート状で用いると施工性に優れる。 The form of the heat-foamed layer can be set arbitrarily. For example, it may be in the form of a sheet, paint, etc. Among these, when used in sheet form, it has excellent workability.

前記加熱発泡層の厚さは必要とされる耐火時間に応じて任意に設定することができる。 The thickness of the heat-foamed layer can be arbitrarily set depending on the required fire resistance time.

前記加熱発泡層に用いる合成樹脂は任意に設定することができる。例えば、アクリル樹脂、塩化ビニル樹脂、酢酸ビニル樹脂、ポリエチレン樹脂、ウレタン樹脂、シリコーン樹脂、天然ゴム、ブタジエンゴム、ブチルゴム等が挙げられる。これらのうち酢酸ビニル樹脂又は酢酸ビニル樹脂と他の合成樹脂とを共重合させた酢酸ビニル共重合樹脂を用いることが好ましい。 The synthetic resin used for the heat-foamed layer can be arbitrarily selected. Examples include acrylic resin, vinyl chloride resin, vinyl acetate resin, polyethylene resin, urethane resin, silicone resin, natural rubber, butadiene rubber, butyl rubber, and the like. Among these, it is preferable to use a vinyl acetate resin or a vinyl acetate copolymer resin obtained by copolymerizing a vinyl acetate resin and another synthetic resin.

前記ポリリン酸アンモニウムと酢酸ビニル共重合樹脂とを含有するシートには、ペンタエリスリトール、ジペンタエリスリトール、ポリエチレングリコール等の多価アルコール、酸化チタン、メラミン等を含有することが好ましい。 The sheet containing ammonium polyphosphate and vinyl acetate copolymer resin preferably contains a polyhydric alcohol such as pentaerythritol, dipentaerythritol, polyethylene glycol, titanium oxide, melamine, and the like.

前記化粧材5は加熱発泡層の外側に設けられることが必要である。 The decorative material 5 needs to be provided outside the heat-foamed layer.

前記化粧材5は柱・梁・壁等の耐火構造1に意匠性を付与するために備えられる。化粧材5は木材に限らず意匠性を付与するものであれば任意に設定することができる。例えば、壁紙、塗料等でも良い。 The decorative material 5 is provided to add design to the fireproof structure 1 such as columns, beams, walls, etc. The decorative material 5 is not limited to wood, and can be arbitrarily set as long as it imparts design properties. For example, it may be wallpaper, paint, etc.

前記化粧材5に木材を用いる場合には樹種はヒノキに限らず任意に設定することができる。例えば、スギ、カラマツ、ヒノキ、イチイ等の針葉樹、サクラ、ケヤキ、ブナ、クヌギ、ナラ等の広葉樹が挙げられる。 When wood is used for the decorative material 5, the tree species is not limited to cypress but can be arbitrarily selected. Examples include conifers such as cedar, larch, cypress, and yew, and broadleaf trees such as cherry, zelkova, beech, oak, and oak.

前記化粧材5に木材を用いる場合には材種は製材に限らず任意に設定することができる。例えば、突板、単板積層板(LVL)等が挙げられる。また、木材の表面に塗装をしても良い。 When wood is used for the decorative material 5, the material type is not limited to sawn timber and can be arbitrarily set. Examples include veneer, veneer laminate (LVL), and the like. Alternatively, the surface of the wood may be painted.

以上のように構成された木造建築物の耐火構造1は、火災時に以下のような機構で構造を保持する。 The fireproof structure 1 of a wooden building constructed as described above maintains its structure in the event of a fire by the following mechanism.

本発明の耐火構造1が火災時の燃焼熱を受けると、最表面の化粧材5が燃焼する。続いて表面温度が200℃以上に達すると加熱発泡層が発泡してシート状無機繊維層3を形成することで熱の伝達を遅らせる。加熱発泡層の厚さが5mm前後であれば、ISO834の標準加熱曲線に従って耐火炉内で加熱を行った場合、約1時間程度は荷重支持木材2に着火せずに耐えることができる。加熱発泡層の発泡温度は200℃以上であるので、荷重支持木材2に直接加熱発泡層が接している状態で加熱終了後に耐火炉内に放置していると徐々に炉内の残熱が荷重支持木材2に伝わり、最終的には木材の着火温度である260℃前後に到達してしまう。しかし、本発明の耐火構造1では、荷重支持木材2と加熱発泡層との間にシート状ロックウールとアルミニウムはくとが積層されているために、炉内の残熱が荷重支持木材2に伝わる前に炉内が冷えてゆき、荷重支持木材2には着火しない。 When the fireproof structure 1 of the present invention receives combustion heat during a fire, the outermost decorative material 5 burns. Subsequently, when the surface temperature reaches 200° C. or higher, the heat foaming layer foams to form a sheet-like inorganic fiber layer 3, thereby delaying heat transfer. If the thickness of the heated foam layer is around 5 mm, the load-supporting wood 2 can withstand about 1 hour without igniting when heated in a refractory furnace according to the standard heating curve of ISO834. The foaming temperature of the heated foam layer is 200°C or higher, so if the heated foam layer is in direct contact with the load-supporting wood 2 and left in the refractory furnace after heating, the residual heat in the furnace will gradually increase the load. This is transmitted to the support wood 2, and eventually reaches around 260° C., which is the ignition temperature of the wood. However, in the fireproof structure 1 of the present invention, since sheet-like rock wool and aluminum foil are laminated between the load-supporting wood 2 and the heated foam layer, residual heat in the furnace is transferred to the load-supporting wood 2. The inside of the furnace cools down before the fire is transmitted, and the load-supporting wood 2 is not ignited.

以下、本発明を実施例と比較例により説明する。木造建築物の耐火構造であって1時間耐火の性能を得るために必要な構成例である。なお、被覆材は荷重支持木材2に近い側を上段に、遠い側を下段になるように記載した。加熱発泡層はポリリン酸アンモニウムと酢酸ビニル共重合樹脂とを含有するシートを使用した場合である。本発明の耐火構造は最も断面積が小さい。 The present invention will be explained below with reference to Examples and Comparative Examples. This is an example of a fire-resistant structure of a wooden building, which is necessary to obtain one-hour fire-resistant performance. In addition, the covering material is described so that the side closer to the load-bearing timber 2 is on the upper level, and the side farther away is on the lower level. The heat-foamed layer is a sheet containing ammonium polyphosphate and vinyl acetate copolymer resin. The fireproof structure of the present invention has the smallest cross-sectional area.

Figure 0007423057000001
Figure 0007423057000001

1 耐火構造
2 荷重支持木材
3 シート状無機繊維層
4 輻射熱反射層
5 化粧材

1 Fireproof structure 2 Load-supporting wood 3 Sheet-like inorganic fiber layer 4 Radiant heat reflective layer 5 Decorative material

Claims (4)

(1)木造建築物の荷重を支持する荷重支持木材と、(2)該荷重支持木材の外側に設けられたシート状無機繊維層と、(3)該シート状無機繊維層の外側に設けられた輻射熱を反射する輻射熱反射層と、(4)該輻射熱反射層の外側に設けられた200℃以上で発泡して断熱性を発現する加熱発泡層と、(5)該加熱発泡層の外側に設けられた化粧材とを備え、前記シート状無機繊維層と輻射熱反射層とが繰り返し積層されていることを特徴とする木造建築物の耐火構造。 (1) A load-supporting timber that supports the load of a wooden building; (2) a sheet-like inorganic fiber layer provided outside the load-supporting timber; and (3) a sheet-like inorganic fiber layer provided outside the sheet-like inorganic fiber layer. a radiant heat reflective layer that reflects the radiant heat; (4) a heated foaming layer provided outside the radiant heat reflective layer that foams at 200°C or higher to exhibit heat insulation; and (5) a heated foamed layer provided outside the heated foamed layer A fireproof structure for a wooden building, characterized in that the sheet-like inorganic fiber layer and the radiant heat reflective layer are repeatedly laminated . 前記シート状無機繊維層がシート状ロックウールであり、前記輻射熱反射層がアルミニウムはくであることを特徴とする請求項に記載の木造建築物の耐火構造。 2. The fireproof structure of a wooden building according to claim 1 , wherein the sheet-like inorganic fiber layer is a sheet-like rock wool, and the radiant heat reflective layer is an aluminum foil. 前記加熱発泡層が酢酸ビニル共重合樹脂とポリリン酸アンモニウムとを含有するシート状であることを特徴とする請求項1又は請求項2に記載の木造建築物の耐火構造。 3. The fireproof structure of a wooden building according to claim 1, wherein the heat-foamed layer is in the form of a sheet containing a vinyl acetate copolymer resin and ammonium polyphosphate. 前記シート状無機繊維層と輻射熱反射層とをあらかじめ貼り合わせた輻射熱反射性断熱部材として施工することを特徴とする請求項1~請求項に記載の木造建築物の耐火構造の施工方法。 4. The method for constructing a fire-resistant structure for a wooden building according to claim 1, wherein the construction is performed as a radiant heat reflective heat insulating member in which the sheet-like inorganic fiber layer and the radiant heat reflective layer are bonded together in advance.
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