JP2022187729A - Fireproof covering structure and construction method thereof - Google Patents

Fireproof covering structure and construction method thereof Download PDF

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JP2022187729A
JP2022187729A JP2021095876A JP2021095876A JP2022187729A JP 2022187729 A JP2022187729 A JP 2022187729A JP 2021095876 A JP2021095876 A JP 2021095876A JP 2021095876 A JP2021095876 A JP 2021095876A JP 2022187729 A JP2022187729 A JP 2022187729A
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wall
fire
fireproof
steel frame
steel
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武 森田
Takeshi Morita
孝之 奥山
Takayuki Okuyama
智紀 遠藤
Tomoki Endo
英人 軽賀
Hideto Karuga
康典 田中
Yasunori Tanaka
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Shimizu Construction Co Ltd
SK Kaken Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
SK Kaken Co Ltd
Shimizu Corp
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Abstract

To provide a fireproof covering structure capable of reliably performing fireproof covering on an outer wall of a steel beam, and a construction method thereof.SOLUTION: A fireproof covering structure includes: a fire-resistant paint 26 provided to the side opposite to a wall 12 on the outer surface of a steel member 14 placed facing and close to the wall 12; and a fireproof covering material 28 sprayed from the side not facing wall 12 to an area where the fire-resistant paint 26 is provided. Also, in order to prevent a spray material 28 from falling off from the surface of the steel member 14, a fall prevention material 30 may be provided to the steel member 14.SELECTED DRAWING: Figure 1

Description

本発明は、耐火被覆構造およびその施工方法に関するものである。 The present invention relates to a fireproof coating structure and its construction method.

従来、鋼構造建築物の建設において、外周梁の耐火被覆工事は、通常、外壁が取り付けられてから行われるのが一般的である。図５（１）に示すように、外壁１を鉄骨梁２の耐火被覆の一部とした合成耐火被覆工法もあるが、耐火構造の認定を国から取得していない場合は、合成耐火被覆工法を適用することができない。その場合、図５（２）に示すように、鉄骨梁２を耐火被覆材３で覆わなければならない。なお、図５中の符号４は床、符号５は層間塞ぎである。 2. Description of the Related Art Conventionally, in the construction of a steel structure building, the fireproof coating work of the outer beams is generally carried out after the outer walls are installed. As shown in Fig. 5 (1), there is also a synthetic fireproof coating method in which the outer wall 1 is part of the fireproof coating of the steel beam 2, but if the fireproof structure has not been certified by the government, the synthetic fireproof coating method cannot be applied. In that case, as shown in FIG. 5(2), the steel frame beam 2 must be covered with the fireproof covering material 3. In addition, the code|symbol 4 in FIG. 5 is a floor, and the code|symbol 5 is an interlayer closing.

一方、こうした耐火被覆構造に関連する従来技術として、例えば特許文献１～３に記載のものが知られている。特許文献１は、Ｈ形鋼のウエブとフランジで形成されるＵ形部の内面に耐火塗料を塗布した鉄骨柱または鉄骨梁の建方を行った後、その外側に耐火性外側板を取付け、次に鉄骨柱または鉄骨梁の内側から耐火材を吹き付けるようにしたものである。また、特許文献２は、鉄骨構造体を構成する鉄骨柱を、耐火性外壁材と、耐火被覆材と、これらの突き合わせ部に配設される耐火性通気部材によって被覆したものである。また、特許文献３は、鉄骨梁の下部フランジを被覆する耐火被覆材をコンクリート外壁板側に延出し、その耐火被覆材の端面とコンクリート外壁板との接合面の上部に、不燃性繊維質材料の裏打ち材を二重に配設したものである。 On the other hand, as conventional techniques related to such a fireproof coating structure, those described in Patent Documents 1 to 3, for example, are known. In Patent Document 1, after erecting a steel frame column or steel frame beam with a fire-resistant paint applied to the inner surface of a U-shaped portion formed by a web of H-shaped steel and a flange, a fire-resistant outer plate is attached to the outside thereof, Next, the refractory material is sprayed from the inside of the steel column or steel beam. Further, in Patent Document 2, a steel frame column constituting a steel frame structure is covered with a fireproof outer wall material, a fireproof coating material, and a fireproof ventilation member arranged at the abutted portion thereof. Further, in Patent Document 3, a fireproof coating material covering the lower flange of a steel beam is extended to the concrete outer wall plate side, and a noncombustible fibrous material is applied to the upper part of the joint surface between the end surface of the fireproof coating material and the concrete outer wall plate. The lining material is doubled.

特開平５－３０６５５４号公報JP-A-5-306554 特開２００１－９８６５９号公報JP-A-2001-98659 特開２００３－２０７４１号公報Japanese Unexamined Patent Application Publication No. 2003-20741

ところで、図５（２）に示すように、外壁１と鉄骨梁２の下フランジ２Ａとの間の隙間Ｌが小さく人の手が入らないような状態では、外壁１と鉄骨梁２の間の耐火被覆を施工することができない。仮にこの狭隘な空間に対して耐火被覆材３を施工できたとしても、鉄骨梁２が完全に耐火被覆材３で覆われているか否かを確認することは難しい。耐火被覆材３の一部にでも隙間や穴があり、鉄骨梁２が露出していると、火災時に鉄骨梁２の温度が上がって鋼材の強度が低下し、当該部材あるいは架構が崩壊するおそれがある。 By the way, as shown in FIG. 5(2), when the gap L between the outer wall 1 and the lower flange 2A of the steel beam 2 is small and human hands cannot enter, the gap between the outer wall 1 and the steel beam 2 is reduced. Fire resistant coating cannot be applied. Even if the fireproof covering material 3 can be constructed in this narrow space, it is difficult to confirm whether the steel beams 2 are completely covered with the fireproof covering material 3 or not. If there is a gap or hole in even a part of the fireproof coating material 3 and the steel beam 2 is exposed, the temperature of the steel beam 2 will rise in the event of a fire, the strength of the steel material will decrease, and the member or frame may collapse. There is

このため、外周の鉄骨梁と外壁の間の空間が狭隘で鉄骨梁を耐火被覆材で覆えないような場合、あるいは国から耐火構造の認定を得ておらず合成耐火被覆工法が適用できないような場合などに、外周の鉄骨梁の外壁側の耐火被覆を確実に行うことができる工法が求められていた。 For this reason, if the space between the outer steel beams and the outer wall is narrow and the steel beams cannot be covered with fireproof coating materials, or if the fireproof structure has not been certified by the government, the composite fireproof coating method cannot be applied. There is a need for a construction method that can reliably coat the outer wall side of the outer steel beams with fireproof coating in such cases.

本発明は、上記に鑑みてなされたものであって、鉄骨梁の外壁側の耐火被覆を確実に行うことができる耐火被覆構造およびその施工方法を提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a fireproof covering structure and a method for constructing the fireproof covering structure that can reliably coat the outer wall side of a steel frame beam with a fireproof covering.

上記した課題を解決し、目的を達成するために、本発明に係る耐火被覆構造は、壁体に近接して対向配置される鉄骨部材の外側表面のうち、壁体に対向する側に設けられる耐火塗料と、壁体に対向しない側から耐火塗料が設けられる領域にかけて吹付けられている耐火性の吹付け材とを備えることを特徴とする。 In order to solve the above-described problems and achieve the object, the fireproof coating structure according to the present invention is provided on the side facing the wall among the outer surfaces of the steel frame member arranged to face the wall in close proximity. It is characterized by comprising a fire-resistant paint and a fire-resistant spraying material that is sprayed from the side that does not face the wall over the area where the fire-resistant paint is provided.

また、本発明に係る他の耐火被覆構造は、上述した発明において、吹付け材は、ロックウールであることを特徴とする。 Further, another fireproof covering structure according to the present invention is characterized in that, in the above invention, the sprayed material is rock wool.

また、本発明に係る他の耐火被覆構造は、上述した発明において、吹付け材が鉄骨部材の表面から脱落することを防止するために鉄骨部材に設けられる脱落防止材をさらに備えることを特徴とする。 Further, another fireproof coating structure according to the present invention is characterized in that, in the above-described invention, it further comprises a falling-off prevention material provided on the steel frame member to prevent the sprayed material from falling off from the surface of the steel frame member. do.

また、本発明に係る耐火被覆方法は、上述した耐火被覆構造を施工する方法であって、鉄骨部材の外側表面のうち壁体に対向する側にあらかじめ耐火塗料が設けられた鉄骨部材を施工現場に搬入するステップと、施工現場において、鉄骨部材の外側表面のうち壁体に対向しない側から耐火塗料が設けられる領域にかけて吹付け材を施工するステップとを有することを特徴とする。 Further, a fireproof coating method according to the present invention is a method for constructing the fireproof coating structure described above, wherein a steel frame member having a fireproof paint applied in advance on the side facing the wall of the outer surface of the steel frame member is installed at the construction site. and a step of applying a spray material from the side of the outer surface of the steel frame member that does not face the wall to the area where the refractory paint is to be applied.

本発明に係る耐火被覆構造によれば、壁体に近接して対向配置される鉄骨部材の外側表面のうち、壁体に対向する側に設けられる耐火塗料と、壁体に対向しない側から耐火塗料が設けられる領域にかけて吹付けられている耐火性の吹付け材とを備えるので、耐火塗料によって鉄骨部材の壁体側の耐火被覆を確実に行うことができる。したがって、鉄骨梁の外壁側の耐火被覆を確実に行うことができるという効果を奏する。 According to the fireproof coating structure according to the present invention, of the outer surface of the steel frame member arranged to face the wall close to the wall, the fireproof paint provided on the side facing the wall and the fireproof coating from the side not facing the wall Since the fire-resistant spraying material is sprayed over the area where the paint is provided, the fire-resistant coating of the wall side of the steel frame member can be reliably performed with the fire-resistant paint. Therefore, there is an effect that the fireproof coating on the outer wall side of the steel frame beam can be reliably performed.

また、本発明に係る他の耐火被覆構造によれば、吹付け材は、ロックウールであるので、鉄骨部材の外側に容易に施工することができるという効果を奏する。 In addition, according to another fireproof covering structure according to the present invention, since the spraying material is rock wool, there is an effect that it can be easily applied to the outside of the steel frame member.

また、本発明に係る他の耐火被覆構造によれば、吹付け材が鉄骨部材の表面から脱落することを防止するために鉄骨部材に設けられる脱落防止材をさらに備えるので、吹付け材の脱落を防止することができるという効果を奏する。 In addition, according to another fireproof coating structure according to the present invention, since the anti-falling material provided on the steel frame member is further provided to prevent the sprayed material from falling off from the surface of the steel frame member, the falling off of the sprayed material is prevented. There is an effect that it is possible to prevent

また、本発明に係る耐火被覆方法によれば、上述した耐火被覆構造を施工する方法であって、鉄骨部材の外側表面のうち壁体に対向する側にあらかじめ耐火塗料が設けられた鉄骨部材を施工現場に搬入するステップと、施工現場において、鉄骨部材の外側表面のうち壁体に対向しない側から耐火塗料が設けられる領域にかけて吹付け材を施工するステップとを有するので、耐火塗料によって鉄骨部材の壁体側の耐火被覆を確実に行うことができる。したがって、鉄骨梁の外壁側の耐火被覆を確実に行うことができるという効果を奏する。 Further, according to the fireproof coating method according to the present invention, in the method for constructing the fireproof coating structure described above, a steel frame member having a fireproof paint applied in advance on the side facing the wall of the outer surface of the steel frame member is provided. Since it has a step of carrying it to the construction site and a step of applying a spray material from the side of the outer surface of the steel frame member that does not face the wall to the area where the fire resistant paint is provided at the construction site, the steel frame member is coated with the fire resistant paint. The fireproof coating on the side of the wall can be reliably performed. Therefore, there is an effect that the fireproof coating on the outer wall side of the steel frame beam can be reliably performed.

図１は、本発明に係る耐火被覆構造およびその施工方法の実施の形態を示す断面図であり、（１）は実施の形態１、（２）は実施の形態２、（３）は実施の形態３、（４）は実施の形態４である。FIG. 1 is a sectional view showing an embodiment of a fireproof covering structure and a construction method thereof according to the present invention. (1) is Embodiment 1, (2) is Embodiment 2, and (3) is Embodiment 2. Modes 3 and (4) are the fourth embodiment. 図２は、試験体の断面図であり、（１）は実施例１の側断面図、（２）は実施例２の側断面図、（３）は比較例の側断面図、（４）は（１）の下断面図である。FIG. 2 is a cross-sectional view of the test body, (1) is a side cross-sectional view of Example 1, (2) is a side cross-sectional view of Example 2, (3) is a side cross-sectional view of Comparative Example, and (4). is a lower sectional view of (1). 図３は、試験体の熱電対取り付け位置を示す図であり、（１）はＡ－Ａ線に沿った断面図、（２）はＢ－Ｂ線に沿った断面図である。3A and 3B are diagrams showing the thermocouple attachment positions of the specimen, where (1) is a cross-sectional view along line AA and (2) is a cross-sectional view along line BB. 図４は、１時間耐火実験における温度測定結果を示す図であり、（１）は実施例１、（２）は実施例２、（３）は比較例である。FIG. 4 is a diagram showing the temperature measurement results in the one-hour fire resistance test, (1) for Example 1, (2) for Example 2, and (3) for Comparative Example. 図５は、従来の耐火被覆構造の一例を示す断面図であり、（１）は合成耐火被覆工法によるもの、（２）は鉄骨梁単体被覆によるものである。FIG. 5 is a cross-sectional view showing an example of a conventional fire-resistant coating structure, (1) using a composite fire-resistant coating method, and (2) using a single steel beam coating.

本発明は、外周の鉄骨部材と外壁の間の空間が狭隘で鉄骨部材を耐火被覆で覆えないような場合、あるいは国から耐火構造の認定を得ておらず合成耐火被覆工法が適用できないような場合に、外周の鉄骨部材の外壁側の耐火被覆を確実に行い耐火性能を確保するためのものである。 The present invention can be used in cases where the space between the outer steel frame member and the outer wall is narrow and the steel frame member cannot be covered with fireproof coating, or where the fireproof structure has not been certified by the government and the synthetic fireproof coating method cannot be applied. In this case, the outer wall side of the steel frame member on the outer periphery is reliably covered with fireproof coating to ensure fireproof performance.

以下に、本発明に係る耐火被覆構造およびその施工方法の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a fireproof covering structure and a construction method thereof according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

（実施の形態１）
まず、本発明の実施の形態１について説明する。
図１（１）に示すように、本実施の形態１に係る耐火被覆構造１００は、室内Ａと室外Ｂを区画する外壁１２（壁体）に近接して配置される鉄骨梁１４（鉄骨部材）に適用される。外壁１２は、例えばプレキャストコンクリート板、軽量気泡コンクリート板（ＡＬＣ板）、押出成形セメント板（ＥＣＰ）などで構成することができる。鉄骨梁１４は、ウェブ１６と上下フランジ１８、２０を有するＨ形鋼からなる。鉄骨梁１４の上フランジ１８の上面には、コンクリートやＡＬＣなどの床２２が設けられる。床２２と外壁１２との間には層間塞ぎ２４（層間区画材）が設けられる。 (Embodiment 1)
First, Embodiment 1 of the present invention will be described.
As shown in FIG. 1(1), the fireproof covering structure 100 according to the first embodiment includes a steel beam 14 (steel member) disposed in the vicinity of an outer wall 12 (wall body) that separates an indoor room A and an outdoor room B. ). The outer wall 12 may be constructed of, for example, precast concrete slabs, lightweight cellular concrete slabs (ALC slabs), extruded cement slabs (ECP), or the like. The steel beams 14 consist of H-beams with webs 16 and upper and lower flanges 18,20. A floor 22 such as concrete or ALC is provided on the upper surface of the upper flange 18 of the steel beam 14 . Between the floor 22 and the outer wall 12, an interlayer closure 24 (interlayer partitioning material) is provided.

この耐火被覆構造１００は、鉄骨梁１４の外側表面のうち、外壁１２に対向する側に設けられる耐火塗料２６と、外壁１２に対向しない側から耐火塗料２６が設置される領域にかけて設けられる耐火性の吹付け材２８とを備える。具体的には、耐火塗料２６は、上フランジ１８の小口から上フランジ１８の下面、ウェブ１６の左側面、下フランジ２０の上面、小口の領域にかけて連続的に設けられる。一方、吹付け材２８は、床２２の下面から上フランジ１８の小口、下面、ウェブ１６の右側面、下フランジ２０の上面、小口、下面全面の領域にかけて連続的に設けられる。 This fire-resistant coating structure 100 includes a fire-resistant paint 26 provided on the side facing the outer wall 12 of the outer surface of the steel beam 14, and a fire-resistant paint 26 provided from the side not facing the outer wall 12 to the area where the fire-resistant paint 26 is installed. and a spraying material 28 of Specifically, the refractory paint 26 is continuously provided from the edge of the upper flange 18 to the lower surface of the upper flange 18, the left side surface of the web 16, the upper surface of the lower flange 20, and the area of the edge. On the other hand, the spray material 28 is continuously provided from the lower surface of the floor 22 to the edge of the upper flange 18, the lower surface, the right side surface of the web 16, the upper surface of the lower flange 20, the edge, and the entire lower surface.

下フランジ２０の下面の外壁１２側の端部側には、脱落防止金物３０（脱落防止材）が取付けられている。下フランジ２０の下面全面に吹付け材２８を施工する場合、下面に吹付けられた吹付け材２８が平常時および火災時に脱落する可能性があるため、脱落を防止するためにこの脱落防止金物３０を使用する。この脱落防止金物３０には、例えば、市販の金具等（例えば「ドリップロック」（耐火被覆工業協同組合）、商品名「スタイロック」（株式会社タイルメント）、巻付け耐火被覆材（例えば、マキベエ（登録商標））などの固定に用いられる留付けピンなど）を用いることができる。ドリップロックやスタイロックのようなベース部分と矢先部分を有する脱落防止金物３０を使用する場合、ベース部分を鋼材表面に接着して使用する。その接着に使用する接着剤としては、無機系接着剤（例えば、インシュレーションアドヘッシブ（ニチアス株式会社））や合成ゴム系接着剤（例えば、セブンレヂン（登録商標）（セブン工業株式会社））などが適している。また、留付けピンを使用する場合、留付けピンは接着剤を使わずに溶接で鋼材面に取り付ける。なお、上記の脱落防止金物３０を使用する場合、鉄骨梁１４の材軸方向における脱落防止金物の設置間隔は４５０ｍｍ以下、好ましくは３００ｍｍ以下が望ましい。 A drop-off prevention hardware 30 (a drop-off prevention material) is attached to the end portion of the lower surface of the lower flange 20 on the side of the outer wall 12 . When the spraying material 28 is applied to the entire lower surface of the lower flange 20, the spraying material 28 sprayed on the lower surface may fall off in normal times and in the event of a fire. 30 is used. The drop-off prevention hardware 30 includes, for example, commercially available metal fittings (for example, "Driplock" (Fireproof Coating Industry Cooperative Association), trade name "Stylock" (Tilement Co., Ltd.), wrapped fireproof coating material (eg, Makibee (registered trademark)) can be used. When using a drop-off prevention metal fitting 30 having a base portion and an arrowhead portion such as a drip lock or a style lock, the base portion is adhered to the surface of the steel material. Adhesives used for the adhesion include inorganic adhesives (e.g., Insulation Adhesive (Nichias Corporation)) and synthetic rubber adhesives (e.g., Seven Resin (registered trademark) (Seven Industry Co., Ltd.)). is suitable. Also, when using a fastening pin, the fastening pin is attached to the steel material surface by welding without using an adhesive. When using the fall-off prevention metal fittings 30 described above, the installation interval of the fall-off prevention metal fittings in the material axial direction of the steel frame beam 14 is preferably 450 mm or less, preferably 300 mm or less.

耐火塗料２６は、加熱により発泡して増厚する発泡性のものであり、例えば、ポリリン酸アンモニウムを主成分とする耐火塗料を用いることができる。このような耐火塗料では、火災時に熱を受けると２５０℃前後で発泡を開始して、２０～３０倍に発泡して断熱層を形成し、鋼材の温度上昇を抑制する。耐火塗料２６は、例えば、数ミリから十数ミリ単位の厚さで鋼材表面にあらかじめプレファブリケータなどの工場でプレコート（先行塗装）しておくことが好ましい。 The fire-resistant coating 26 is a foamable coating that expands and thickens when heated, and for example, a fire-resistant coating containing ammonium polyphosphate as a main component can be used. Such a fire-resistant paint starts to foam at around 250° C. when exposed to heat in the event of a fire, expands 20 to 30 times, forms a heat insulating layer, and suppresses the temperature rise of the steel material. The fire-resistant paint 26 is preferably pre-coated (pre-coated) on the surface of the steel material in advance in a factory such as a prefabricator with a thickness of several millimeters to ten-odd millimeters, for example.

吹付け材２８は、耐火塗料２６の先行塗装範囲外の残りの範囲に吹付けることによって設けられる。この吹付け材２８には、例えば、吹付けロックウールなどの無機系の耐火被覆材を用いることができる。吹付け材２８は、施工現場で鉄骨梁１４に施工することが望ましい。 The spray material 28 is applied by spraying the remaining areas outside the previously painted areas of the refractory paint 26 . For the spray material 28, for example, an inorganic fireproof coating material such as spray rock wool can be used. The spray material 28 is desirably applied to the steel beam 14 at the construction site.

上記の耐火被覆構造１００を施工する場合には、まず、予めプレファブリケータなどの工場で、外壁１２側となる鉄骨梁１４の表面に耐火塗料２６をプレコートしておく。その後、この鉄骨梁１４を建物の施工現場に搬入し、外壁１２の近傍の施工位置に取り付ける。次に、鉄骨梁１４の下フランジ２０に脱落防止金物３０を取り付けた後、鉄骨梁１４の表面の残りの部分に対して吹付け材２８を吹付ける。このようにすれば、耐火被覆構造１００を容易に施工することができる。また、プレコートした耐火塗料２６によって鉄骨梁１４の外壁１２側の耐火被覆を確実に行うことができる。 When constructing the above-described fireproof coating structure 100, first, the surface of the steel frame beam 14 on the outer wall 12 side is pre-coated with the fireproof paint 26 in advance at a factory such as a prefabricator. After that, the steel beams 14 are carried to the construction site of the building and attached to the construction position near the outer wall 12 . Next, after attaching the drop-off prevention hardware 30 to the lower flange 20 of the steel beam 14 , the remaining surface of the steel beam 14 is sprayed with a spray material 28 . In this way, the fireproof covering structure 100 can be easily constructed. In addition, the precoated fire-resistant paint 26 can reliably provide fire-resistant coating on the outer wall 12 side of the steel frame beam 14 .

したがって、本実施の形態によれば、外周の鉄骨梁１４と外壁１２との間の空間が狭隘であっても、外周の鉄骨梁１４の外壁１２側の耐火被覆を確実に行い耐火性能を確保することができる。また、国から耐火構造の認定を得ておらず合成耐火被覆工法が適用できないような場合であっても、外周の鉄骨梁１４の外壁１２側の耐火被覆を確実に行い耐火性能を確保することができる。さらに、工場で耐火塗料２６を鉄骨梁１４にあらかじめ塗装することによって、施工現場での耐火被覆工事を省力化することができる。 Therefore, according to the present embodiment, even if the space between the outer steel beam 14 and the outer wall 12 is narrow, the outer wall 12 side of the outer steel beam 14 is reliably coated with fire resistance to ensure fire resistance. can do. In addition, even if the synthetic fireproof coating construction method cannot be applied because the fireproof structure has not been certified by the government, the fireproof performance must be ensured by ensuring the fireproof coating on the outer wall 12 side of the outer steel beam 14 on the outer periphery. can be done. Furthermore, by pre-coating the steel frame beam 14 with the fire-resistant paint 26 at the factory, it is possible to save labor for the fire-resistant coating work at the construction site.

なお、上記の実施の形態においては、鉄骨梁１４がＨ形鋼である場合を例にとり説明したが、本発明はこれに限るものではなく、鉄骨梁に用い得る鉄骨部材であればいかなるものでもよい。例えば他の断面形状の鋼材で構成されていてもよい。このようにしても上記と同様の作用効果を奏することができる。また、上記の実施の形態においては、鉄骨部材が鉄骨梁１４である場合を例にとり説明したが、本発明はこれに限るものではなく、鉄骨柱であってもよい。鉄骨柱の断面形状は鉄骨柱に用い得る断面形状であればいかなるものでもよい。このようにしても上記と同様の作用効果を奏することができる。 In the above embodiment, the case where the steel beam 14 is H-shaped steel has been described as an example, but the present invention is not limited to this, and any steel frame member that can be used for the steel beam can be used. good. For example, it may be made of steel having another cross-sectional shape. Even if it does in this way, there can exist an effect similar to the above. Further, in the above embodiment, the case where the steel frame member is the steel beam 14 has been described as an example, but the present invention is not limited to this, and may be a steel frame column. The cross-sectional shape of the steel column may be any cross-sectional shape that can be used for the steel column. Even if it does in this way, there can exist an effect similar to the above.

（実施の形態２）
次に、本発明の実施の形態２について説明する。
図１（２）に示すように、本実施の形態２に係る耐火被覆構造２００は、上記の実施の形態１において、下フランジ２０下面の被覆に耐火塗料２６と吹付け材２８を施工したものである。具体的には、耐火塗料２６は、上フランジ１８の小口から上フランジ１８の下面、ウェブ１６の左側面、下フランジ２０の上面、小口、下面の一部の領域にかけて連続的に設けられる。一方、吹付け材２８は、床２２の下面から上フランジ１８の小口、下面、ウェブ１６の右側面、下フランジ２０の上面、小口、下面の一部の領域にかけて連続的に設けられる。 (Embodiment 2)
Next, Embodiment 2 of the present invention will be described.
As shown in FIG. 1(2), the fire-resistant coating structure 200 according to the second embodiment is the same as the first embodiment, except that the coating of the lower surface of the lower flange 20 is coated with a fire-resistant paint 26 and a spray material 28. is. Specifically, the refractory paint 26 is continuously applied from the edge of the upper flange 18 to the lower surface of the upper flange 18, the left side surface of the web 16, the upper surface, edge, and part of the lower surface of the lower flange 20. FIG. On the other hand, the spray material 28 is continuously provided from the lower surface of the floor 22 to the edge of the upper flange 18, the lower surface, the right side surface of the web 16, the upper surface, the edge, and a part of the lower surface of the lower flange 20.

この場合も、吹付け材２８の施工部分については脱落の可能性があるため、脱落防止金物３０を取り付ける。耐火塗料２６と吹付け材２８の端部は所定の重ね代ｄで重ね合わせている。重ね代ｄは、１０ｍｍ以上、好ましくは２０ｍｍ以上を確保することが望ましい。このような構成によっても、上記の実施の形態１と同様の作用効果を奏することができる。 Also in this case, since there is a possibility that the sprayed material 28 will fall off, the falling-off prevention hardware 30 is attached. The ends of the refractory paint 26 and the spray material 28 are overlapped with a predetermined overlap margin d. It is desirable to ensure an overlap margin d of 10 mm or more, preferably 20 mm or more. With such a configuration as well, the same effects as those of the first embodiment can be obtained.

（実施の形態３）
次に、本発明の実施の形態３について説明する。
図１（３）に示すように、本実施の形態３に係る耐火被覆構造３００は、上記の実施の形態１において、下フランジ２０下面の全面に耐火塗料２６を施工したものである。具体的には、耐火塗料２６は、上フランジ１８の小口から上フランジ１８の下面、ウェブ１６の左側面、下フランジ２０の上面、小口、下面全面の領域にかけて連続的に設けられる。一方、吹付け材２８は、床２２の下面から上フランジ１８の小口、下面、ウェブ１６の右側面、下フランジ２０の上面、小口の領域にかけて連続的に設けられる。 (Embodiment 3)
Next, Embodiment 3 of the present invention will be described.
As shown in FIG. 1(3), the fireproof coating structure 300 according to the third embodiment is the same as the first embodiment, except that the entire lower surface of the lower flange 20 is coated with the fireproof paint 26 . Specifically, the refractory paint 26 is continuously provided from the edge of the upper flange 18 to the lower surface of the upper flange 18, the left side surface of the web 16, the upper surface, the edge, and the entire lower surface of the lower flange 20. FIG. On the other hand, the spray material 28 is continuously provided from the lower surface of the floor 22 to the edge of the upper flange 18, the lower surface, the right side of the web 16, the upper surface of the lower flange 20, and the edge area.

この場合は、外壁１２とは反対側の下フランジ２０小口面の吹付け材２８が脱落する可能性があるため、この小口面に脱落防止金物３０を取り付ける。このような構成によっても、上記の実施の形態１と同様の作用効果を奏することができる。 In this case, there is a possibility that the sprayed material 28 on the edge of the lower flange 20 on the side opposite to the outer wall 12 may come off. With such a configuration as well, the same effects as those of the first embodiment can be obtained.

（実施の形態４）
次に、本発明の実施の形態４について説明する。
図１（４）に示すように、本実施の形態４に係る耐火被覆構造４００は、上記の実施の形態１において、下フランジ２０下面の全面から、外壁１２とは反対側の小口面まで耐火塗料２６を施工したものである。具体的には、耐火塗料２６は、上フランジ１８の小口から上フランジ１８の下面、ウェブ１６の左側面、下フランジ２０の上面、小口（左）、下面、小口（右）の領域にかけて連続的に設けられる。一方、吹付け材２８は、床２２の下面から上フランジ１８の小口、下面、ウェブ１６の右側面、下フランジ２０の上面の領域にかけて連続的に設けられる。 (Embodiment 4)
Next, Embodiment 4 of the present invention will be described.
As shown in FIG. 1(4), the fireproof covering structure 400 according to the fourth embodiment is different from the first embodiment described above in that the fireproof covering structure 400 extends from the entire lower surface of the lower flange 20 to the fore-end surface opposite to the outer wall 12. Paint 26 is applied. Specifically, the refractory paint 26 is applied continuously from the edge of the upper flange 18 to the lower surface of the upper flange 18, the left side of the web 16, the upper surface of the lower flange 20, the edge (left), the bottom surface, and the edge (right). provided in On the other hand, the spray material 28 is continuously provided from the lower surface of the floor 22 to the edge of the upper flange 18 , the lower surface, the right side surface of the web 16 and the upper surface of the lower flange 20 .

この場合は、吹付け材２８が脱落する可能性はないため、脱落防止金物３０は不要である。このような構成によっても、上記の実施の形態１と同様の作用効果を奏することができる。 In this case, since there is no possibility that the sprayed material 28 will fall off, the falling-off prevention hardware 30 is unnecessary. With such a configuration as well, the same effects as those of the first embodiment can be obtained.

＜本発明の効果の検証＞
次に、本発明の効果を確認するために行った耐火実験について説明する。
耐火実験に使用した試験体は、下フランジ下面の全面に吹付けロックウールを施工する仕様（本発明の実施例１：図２（１）、（４））、下フランジ下面の被覆に耐火塗料と吹付けロックウールを施工する仕様（本発明の実施例２：図２（２））、通常の吹付け工法（比較例：図２（３））の３種類である。鉄骨梁の断面はＨ－４００×２００×８×１３ｍｍであり、吹付けロックウールの厚さは２５ｍｍ、耐火塗料の厚さは１．５ｍｍである。脱落防止金物としてドリップロックを用い、合成ゴム系接着剤で貼り付けた。 <Verification of effects of the present invention>
Next, a fire resistance test conducted to confirm the effects of the present invention will be described.
The specimen used in the fire resistance test was a specification in which sprayed rock wool was applied to the entire lower surface of the lower flange (Example 1 of the present invention: Figs. 2 (1) and (4)), and a fire resistant paint was applied to the lower surface of the lower flange. There are three types: a specification for applying sprayed rock wool (Example 2 of the present invention: Fig. 2 (2)) and a normal spraying method (Comparative example: Fig. 2 (3)). The cross-section of the steel beam is H-400×200×8×13 mm, the thickness of the sprayed rock wool is 25 mm, and the thickness of the refractory paint is 1.5 mm. A drip lock was used as a drop-off prevention hardware, and attached with a synthetic rubber-based adhesive.

耐火実験は、試験体を耐火試験炉内に配置して、所定の加熱温度－時間曲線にしたがって１時間の加熱を行う加熱試験とした。この耐火実験の結果、下フランジ下面に施工された吹付けロックウールの脱落は生じることはなかった。試験体の熱電対取付け位置を図３に、熱電対による温度測定結果を図４に示す。図４（１）は、実施例１の温度測定結果、（２）は実施例２の温度測定結果、（３）は比較例の温度測定結果である。 The fire resistance test was a heating test in which the specimen was placed in a fire resistance test furnace and heated for 1 hour according to a predetermined heating temperature-time curve. As a result of this fire resistance test, the sprayed rock wool applied to the lower surface of the lower flange did not come off. Fig. 3 shows the thermocouple attachment position of the specimen, and Fig. 4 shows the results of temperature measurement by the thermocouple. FIG. 4(1) is the temperature measurement result of Example 1, (2) is the temperature measurement result of Example 2, and (3) is the temperature measurement result of Comparative Example.

図４に示すように、実施例１および実施例２の試験体の鋼材温度は、耐火性能を満足するための鋼材温度の許容値の目安である５５０℃以下、好ましくは５１０℃以下を満足しており、耐火塗料と吹付けロックウールの施工面の境界部分が弱点になることはなく、所要の耐火性能を有することが確認できた。 As shown in FIG. 4, the steel material temperature of the specimens of Examples 1 and 2 satisfied 550° C. or less, preferably 510° C. or less, which is the allowable value of the steel material temperature for satisfying the fire resistance performance. Therefore, it was confirmed that the boundary between the fire-resistant paint and the sprayed rock wool did not become a weak point and had the required fire-resistant performance.

以上説明したように、本発明に係る耐火被覆構造によれば、壁体に近接して対向配置される鉄骨部材の外側表面のうち、壁体に対向する側に設けられる耐火塗料と、壁体に対向しない側から耐火塗料が設けられる領域にかけて吹付けられている耐火性の吹付け材とを備えるので、耐火塗料によって鉄骨部材の壁体側の耐火被覆を確実に行うことができる。したがって、鉄骨梁の外壁側の耐火被覆を確実に行うことができる。 As described above, according to the fireproof coating structure according to the present invention, the fireproof paint provided on the side facing the wall, of the outer surface of the steel frame member arranged to face the wall in close proximity to the wall; Since the fire-resistant spraying material is sprayed from the side not facing to the fire-resistant coating over the area where the fire-resistant coating is provided, the fire-resistant coating on the wall side of the steel frame member can be reliably performed with the fire-resistant coating. Therefore, the fireproof coating on the outer wall side of the steel frame beam can be reliably performed.

また、本発明に係る他の耐火被覆構造によれば、吹付け材は、ロックウールであるので、鉄骨部材の外側に容易に施工することができる。 Further, according to another fireproof covering structure according to the present invention, since the sprayed material is rock wool, it can be easily applied to the outside of the steel frame member.

また、本発明に係る他の耐火被覆構造によれば、吹付け材が鉄骨部材の表面から脱落することを防止するために鉄骨部材に設けられる脱落防止材をさらに備えるので、吹付け材の脱落を防止することができる。 In addition, according to another fireproof coating structure according to the present invention, since the anti-falling material provided on the steel frame member is further provided to prevent the sprayed material from falling off from the surface of the steel frame member, the falling off of the sprayed material is prevented. can be prevented.

また、本発明に係る耐火被覆方法によれば、上述した耐火被覆構造を施工する方法であって、鉄骨部材の外側表面のうち壁体に対向する側にあらかじめ耐火塗料が設けられた鉄骨部材を施工現場に搬入するステップと、施工現場において、鉄骨部材の外側表面のうち壁体に対向しない側から耐火塗料が設けられる領域にかけて吹付け材を施工するステップとを有するので、耐火塗料によって鉄骨部材の壁体側の耐火被覆を確実に行うことができる。したがって、鉄骨梁の外壁側の耐火被覆を確実に行うことができる。 Further, according to the fireproof coating method according to the present invention, in the method for constructing the fireproof coating structure described above, a steel frame member having a fireproof paint applied in advance on the side facing the wall of the outer surface of the steel frame member is provided. Since it has a step of carrying it to the construction site and a step of applying a spray material from the side of the outer surface of the steel frame member that does not face the wall to the area where the fire resistant paint is provided at the construction site, the steel frame member is coated with the fire resistant paint. The fireproof coating on the side of the wall can be reliably performed. Therefore, the fireproof coating on the outer wall side of the steel frame beam can be reliably performed.

以上のように、本発明に係る耐火被覆構造およびその施工方法は、外周の鉄骨梁と外壁の間の空間が狭隘で鉄骨梁を耐火被覆材で覆えないような場合、あるいは国から耐火構造の認定を得ておらず合成耐火被覆工法が適用できないような場合に有用であり、特に、外周の鉄骨梁の外壁側の耐火被覆を確実に行うのに適している。 As described above, the fireproof covering structure and construction method thereof according to the present invention can be used when the space between the outer steel beam and the outer wall is narrow and the steel beam cannot be covered with the fireproof covering material, or when the fireproof structure is required by the government. It is useful in cases where the synthetic fireproof coating construction method cannot be applied due to lack of certification, and is particularly suitable for reliably performing fireproof coating on the outer wall side of the outer peripheral steel beam.

１２ 外壁（壁体）
１４ 鉄骨梁（鉄骨部材）
１６ ウェブ
１８ 上フランジ
２０ 下フランジ
２２ 床
２４ 層間塞ぎ
２６ 耐火塗料
２８ 吹付け材
３０ 脱落防止金物（脱落防止材）
１００，２００，３００，４００ 耐火被覆構造
Ａ 室内
Ｂ 室外 12 Outer wall (wall body)
14 Steel beam (steel frame member)
16 Web 18 Upper Flange 20 Lower Flange 22 Floor 24 Interlayer Sealing 26 Fire Resistant Paint 28 Spraying Material 30 Falling Prevention Hardware (Falling Prevention Material)
100, 200, 300, 400 Fireproof coating structure A Indoor B Outdoor

Claims (4)

壁体に近接して対向配置される鉄骨部材の外側表面のうち、壁体に対向する側に設けられる耐火塗料と、壁体に対向しない側から耐火塗料が設けられる領域にかけて吹付けられている耐火性の吹付け材とを備えることを特徴とする耐火被覆構造。 Of the outer surface of a steel frame member arranged in close proximity to the wall, the fire-resistant paint is applied to the side facing the wall, and the fire-resistant paint is sprayed from the side not facing the wall to the area where the fire-resistant paint is provided. A fire resistant cladding structure comprising: a fire resistant spray material. 吹付け材は、ロックウールであることを特徴とする請求項１に記載の耐火被覆構造。 2. The fireproof coating structure according to claim 1, wherein the spraying material is rock wool. 吹付け材が鉄骨部材の表面から脱落することを防止するために鉄骨部材に設けられる脱落防止材をさらに備えることを特徴とする請求項１または２に記載の耐火被覆構造。 3. The fireproof covering structure according to claim 1 or 2, further comprising an anti-falling material provided on the steel frame member to prevent the sprayed material from falling off from the surface of the steel frame member. 請求項１～３のいずれか一つに記載の耐火被覆構造を施工する方法であって、
鉄骨部材の外側表面のうち壁体に対向する側にあらかじめ耐火塗料が設けられた鉄骨部材を施工現場に搬入するステップと、施工現場において、鉄骨部材の外側表面のうち壁体に対向しない側から耐火塗料が設けられる領域にかけて吹付け材を施工するステップとを有することを特徴とする耐火被覆構造の施工方法。 A method for constructing the fireproof coating structure according to any one of claims 1 to 3,
A step of carrying a steel frame member having a fireproof paint applied in advance on the side of the outer surface of the steel frame member facing the wall to the construction site; and applying a spray material over an area where the fire resistant coating is to be applied.
JP2021095876A 2021-06-08 2021-06-08 Fireproof covering structure and construction method thereof Pending JP2022187729A (en)

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