JP2021188436A - Fireproof structure of horizontal lumber - Google Patents

Fireproof structure of horizontal lumber Download PDF

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JP2021188436A
JP2021188436A JP2020096804A JP2020096804A JP2021188436A JP 2021188436 A JP2021188436 A JP 2021188436A JP 2020096804 A JP2020096804 A JP 2020096804A JP 2020096804 A JP2020096804 A JP 2020096804A JP 2021188436 A JP2021188436 A JP 2021188436A
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hole
covering portion
wall
indoor
tubular covering
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JP7490455B2 (en
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正人 堀
Masato Hori
順二 坂田
Junji Sakata
佑樹 小泉
Yuki Koizumi
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Japan Insulation Co Ltd
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Japan Insulation Co Ltd
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Abstract

To provide a fireproof structure of horizontal lumber in which the horizontal lumber with through holes is arranged so as to face the indoor surface of the outer wall, the fireproof structure having good workability when installing fireproof materials on the horizontal lumber.SOLUTION: A fireproof structure 1 of horizontal lumber 3 includes an outer wall 2 having a through hole 22, a horizontal lumber 3 facing the indoor side surface of the outer wall 2, and a fireproof material 6 covering the horizontal lumber 3. The horizontal lumber 3 has a through hole 33 formed at a position corresponding to the through hole 22. The fireproof material 6 has an indoor surface covering portion 61 that covers a portion of the indoor side surface of the horizontal lumber 3 excluding the through hole 33 and a cylindrical covering portion 62 connecting the indoor surface covering portion 61 and the outer wall 2 in a state where the through hole 22 and the through hole 33 are in communication with each other. In the cylindrical covering portion 62, one end in the central axis direction is a fixed end fixed to the connection target, and the other end in the central axis direction is a non-fixed end that is non-fixed to the connection target.SELECTED DRAWING: Figure 1

Description

本発明は、横架材の耐火構造に関し、より詳細には、孔が形成された横架材を耐火材で被覆した横架材の耐火構造に関する。 The present invention relates to a fire-resistant structure of a horizontal material, and more particularly to a fire-resistant structure of a horizontal material in which a horizontal material having holes is coated with the fire-resistant material.

特許文献１には、従来の横架材の耐火構造が記載されている。特許文献１記載の耐火構造では、鉄骨梁に貫通開口が形成されており、貫通開口にダクトが通されている。鉄骨梁の貫通開口にダクトを通すことで、鉄骨梁の下方にダクトを通す場合よりも建築物の高さを抑えることができる。 Patent Document 1 describes a fireproof structure of a conventional horizontal lumber. In the fireproof structure described in Patent Document 1, a through opening is formed in the steel frame beam, and a duct is passed through the through opening. By passing the duct through the through opening of the steel beam, the height of the building can be suppressed as compared with the case where the duct is passed below the steel beam.

鉄骨梁には、吹き付け等によって耐火被覆材が施される。鉄骨梁は、耐火被覆材で覆われることで、火事の際の火熱によって高熱になるのが抑制される。 A fireproof coating material is applied to the steel beam by spraying or the like. By covering the steel beam with a refractory covering material, it is possible to prevent the steel beam from becoming high due to the heat of fire.

特開平１０−１４０７０５号公報Japanese Unexamined Patent Publication No. 10-140705

ところで、鉄骨梁には外壁が対向するように配置される。鉄骨梁の屋外側の面を、火熱に対して保護しようとする場合、鉄骨梁の下端部と外壁との間から火熱の侵入を防ぐために、鉄骨梁の下端部と外壁との間を塞ぐことが考えられる。しかし、鉄骨梁の下端部と外壁との間を塞ぐだけでは、貫通開口から入る火熱によって鉄骨梁が熱されるという問題がある。 By the way, the steel beam is arranged so that the outer walls face each other. When trying to protect the outdoor surface of a steel beam from heat, block the space between the bottom of the steel beam and the outer wall to prevent heat from entering between the bottom of the beam and the outer wall. Can be considered. However, there is a problem that the steel beam is heated by the thermal heat entering from the through opening only by closing the space between the lower end of the steel beam and the outer wall.

これに対し、鉄骨梁の外壁に対向する面全体を直接的に耐火被覆材で被覆したり、鉄骨梁と外壁との間の空間全体に対して耐火被覆材を充填したりすることも考えられるが、外壁と鉄骨梁との間の寸法が小さいと、施工が困難であるという問題がある。 On the other hand, it is conceivable to directly cover the entire surface of the steel beam facing the outer wall with the fireproof coating material, or to fill the entire space between the steel frame beam and the outer wall with the fireproof coating material. However, if the dimension between the outer wall and the steel beam is small, there is a problem that construction is difficult.

本発明は、上記事情に鑑みてなされ、貫通孔が形成された横架材が、外壁の屋内側の面に対向するように配置された構造において、横架材に対して耐火材を施工する際に施工性がよい横架材の耐火構造を提供することを目的とする。 The present invention has been made in view of the above circumstances, and in a structure in which a horizontal member having a through hole is arranged so as to face an indoor surface of an outer wall, a refractory material is applied to the horizontal member. It is an object of the present invention to provide a fireproof structure of a horizontal lumber with good workability.

本発明に係る一態様の横架材の耐火構造は、貫通孔を有する外壁と、前記外壁の屋内側の面に対向する横架材と、前記横架材を被覆する耐火材と、を備える。前記横架材は、前記貫通孔に対応する位置に形成された貫通孔を有する。前記耐火材は、前記横架材の屋内側の面のうち前記貫通孔を除く部分を被覆する屋内面被覆部と、前記外壁の貫通孔と前記横架材の貫通孔とを通じさせた状態で、前記屋内面被覆部と前記外壁とをつなぐ筒状被覆部と、を有し、前記筒状被覆部は、中心軸方向の一方の端部がその接続対象に対して固定された固定端部であり、中心軸方向の他方の端部がその接続対象に対して非固定である非固定端部である。 The fireproof structure of the horizontal member according to the present invention includes an outer wall having a through hole, a horizontal member facing the indoor side surface of the outer wall, and a fireproof material covering the horizontal member. .. The horizontal member has a through hole formed at a position corresponding to the through hole. The refractory material is in a state where the indoor surface covering portion covering the portion of the indoor side surface of the horizontal member excluding the through hole, the through hole of the outer wall, and the through hole of the horizontal member are passed through. The tubular covering portion has a cylindrical covering portion that connects the indoor surface covering portion and the outer wall, and the tubular covering portion has a fixed end portion in which one end portion in the central axial direction is fixed to the connection target. The other end in the central axis direction is a non-fixed end that is non-fixed to the connection target.

本発明に係る上記態様の横架材の耐火構造は、貫通孔が形成された横架材が、外壁の屋内側の面に対向するように配置された構造において、横架材に対して耐火材を施工する際に施工性がよい、という利点がある。 The fireproof structure of the horizontal member of the above aspect according to the present invention is a structure in which the horizontal member having a through hole is arranged so as to face the indoor surface of the outer wall, and the fireproof structure is fireproof against the horizontal member. It has the advantage of good workability when constructing lumber.

図１（Ａ）は、本発明の一実施形態に係る横架材の耐火構造の断面図である。図１（Ｂ）は、図１（Ａ）のＸ１−Ｘ１線断面図である。FIG. 1A is a cross-sectional view of a fireproof structure of a horizontal member according to an embodiment of the present invention. FIG. 1B is a sectional view taken along line X1-X1 of FIG. 1A. 図２（Ａ）は、変形例１に係る横架材の耐火構造の断面図である。図２（Ｂ）は、図２（Ａ）のＹ１−Ｙ１線断面図である。FIG. 2A is a cross-sectional view of the fireproof structure of the horizontal member according to the modified example 1. FIG. 2B is a cross-sectional view taken along the line Y1-Y1 of FIG. 2A. 図３（Ａ）は、変形例２に係る横架材の耐火構造の断面図である。図３（Ｂ）は、変形例２の更なる変形例の断面図である。FIG. 3A is a cross-sectional view of the fireproof structure of the horizontal member according to the modified example 2. FIG. 3B is a cross-sectional view of a further modification of the modification 2. 図４（Ａ）は、変形例３に係る横架材の耐火構造の断面図である。図４（Ｂ）は、変形例３の更なる変形例の断面図である。FIG. 4A is a cross-sectional view of the fireproof structure of the horizontal member according to the modified example 3. FIG. 4B is a cross-sectional view of a further modification of the modification 3. 図５は、変形例４に係る横架材の耐火構造の断面図である。FIG. 5 is a cross-sectional view of the fireproof structure of the horizontal member according to the modified example 4. 図６は、変形例５に係る横架材の耐火構造の断面図である。FIG. 6 is a cross-sectional view of the fireproof structure of the horizontal member according to the modified example 5.

（１）実施形態
以下、本実施形態に係る横架材３の耐火構造１について、詳細に説明する。 (1) Embodiment Hereinafter, the fireproof structure 1 of the horizontal member 3 according to the present embodiment will be described in detail.

本実施形態に係る横架材３の耐火構造１（以下、「耐火構造１」という）は、建築物の下階１１における上階１２に隣接した部分での耐火構造１である。ここでいう建築物は、非住宅建築物及び住宅建築物のいずれも含み、例えば、住宅家屋、事務所，店舗，興行場，倉庫、工場、集会場等を含む。本実施形態に係る建築物は、鉄骨造建築物であるが、木造建築物であってもよい。また、上階１２は、上下方向に並ぶ一対の階のうちの上側の階を意味し、下階１１は一対の階のうちの下側の階を意味する。上階１２及び下階１１は、例えば、一階、二階等の居住空間のほか、屋根裏、小屋裏、天井裏等の空間を含む。したがって、建築物としては、二階建て建築物に限らず、平屋建築物及び三階建て以上の建築物を含む。 The fireproof structure 1 (hereinafter referred to as “fireproof structure 1”) of the horizontal member 3 according to the present embodiment is a fireproof structure 1 in a portion adjacent to the upper floor 12 on the lower floor 11 of the building. The building referred to here includes both non-residential buildings and residential buildings, and includes, for example, residential houses, offices, stores, entertainment venues, warehouses, factories, meeting places, and the like. The building according to the present embodiment is a steel-framed building, but may be a wooden building. Further, the upper floor 12 means the upper floor of the pair of floors arranged in the vertical direction, and the lower floor 11 means the lower floor of the pair of floors. The upper floor 12 and the lower floor 11 include, for example, living spaces such as the first floor and the second floor, as well as spaces such as an attic, a cabin, and a ceiling. Therefore, the building is not limited to a two-story building, but includes a one-story building and a three-story or more building.

本発明にいう「耐火構造１」とは、建築物に火事が生じた際の火熱に耐えるための構造を意味する。本明細書では、「耐火」「準耐火」「防火」「準防火」等の厳密な区別までは必要ではないため、「耐火」は、「準耐火」、「防火」及び「準防火」も含むこととする。 The "fireproof structure 1" as used in the present invention means a structure for withstanding the heat of fire when a fire occurs in a building. In this specification, since it is not necessary to make a strict distinction between "fireproof", "quasi-fireproof", "fireproof", "quasi-fireproof", etc., "fireproof" also means "quasi-fireproof", "fireproof" and "quasi-fireproof". It shall be included.

耐火構造１は、図１に示すように、複数の外壁２と、横架材３と、ラス５と、耐火材６と、固定部７と、挿通部材９と、を備える。 As shown in FIG. 1, the refractory structure 1 includes a plurality of outer walls 2, a horizontal member 3, a lath 5, a refractory material 6, a fixing portion 7, and an insertion member 9.

外壁２は、建築物の外側を囲む壁である。外壁２の外側の面は外壁面である。外壁２は、本実施形態では、外壁板２１のみで構成されているが、本発明では、外壁板２１の屋内側の面に、断熱材、構造用合板、通気層、透湿防水シート等が重なる構造であってもよい。 The outer wall 2 is a wall that surrounds the outside of the building. The outer surface of the outer wall 2 is an outer wall surface. In the present embodiment, the outer wall 2 is composed of only the outer wall plate 21, but in the present invention, a heat insulating material, a structural plywood, a ventilation layer, a moisture permeable waterproof sheet, etc. are provided on the indoor side surface of the outer wall plate 21. It may have an overlapping structure.

外壁板２１は、外壁面を有する板状の建材である。外壁板２１としては、例えば、ＡＬＣ、金属系サイディング、窯業系サイディング、樹脂系サイディング、木質系サイディング、サンドイッチパネル、押出成形セメント板（ECP；Extruded Cement Panel）、PC（precast concrete）板、ガラス繊維補強セメントパネル（GRC；Glassfiber Reinforced Cement）、PCカーテンウォール、RC（Reinforced Concrete）壁等が挙げられる。複数の外壁板２１は、鉛直面に沿って、鉛直方向及び水平方向に並ぶように配置される。複数の外壁板２１は、図示しない複数の柱（間柱及び管柱を含む）に対し、例えば、胴縁、支持金物等を介して取り付けられる。 The outer wall plate 21 is a plate-shaped building material having an outer wall surface. Examples of the outer wall plate 21 include ALC, metal siding, ceramic siding, resin siding, wood siding, sandwich panel, extruded cement panel (ECP), PC (precast concrete) plate, and glass fiber. Examples include reinforced cement panels (GRC; Glassfiber Reinforced Cement), PC curtain walls, RC (Reinforced Concrete) walls, and the like. The plurality of outer wall plates 21 are arranged so as to be arranged vertically and horizontally along the vertical plane. The plurality of outer wall plates 21 are attached to a plurality of columns (including studs and pipe columns) (not shown) via, for example, a furring strip, a support metal fitting, or the like.

外壁２には、外壁２の屋内側の面から外壁面に至るように貫通する貫通孔（以下、「第一貫通孔２２」という）が形成されている。第一貫通孔２２は、屋内外方向に沿って延びている。ここでいう「屋内外方向」とは、水平方向のうち、外壁面に直交する方向を意味する。ただし、第一貫通孔２２は、屋内外方向に平行に形成されていなくてもよく、例えば、屋内外方向に対して傾いていてもよい。また、第一貫通孔２２は、本実施形態では丸穴であるが、角穴であってもよい。 The outer wall 2 is formed with a through hole (hereinafter referred to as "first through hole 22") penetrating from the indoor side surface of the outer wall 2 to the outer wall surface. The first through hole 22 extends along the indoor and outdoor directions. The "indoor / outdoor direction" here means a direction orthogonal to the outer wall surface in the horizontal direction. However, the first through hole 22 may not be formed parallel to the indoor / outdoor direction, and may be inclined with respect to the indoor / outdoor direction, for example. Further, the first through hole 22 is a round hole in the present embodiment, but may be a square hole.

横架材３は、建築物の躯体を構成する一構成部材である。横架材３の長手方向は、屋内外方向に略直交しかつ水平面に沿っている。外壁２は、横架材３に沿っている。すなわち、横架材３は、外壁２の屋内側の面に対向している。横架材３は、外壁２との間に間隔をおいて配置されている。ただし、横架材３と外壁２とは接触していてもよい。 The horizontal member 3 is a constituent member that constitutes the frame of the building. The longitudinal direction of the horizontal member 3 is substantially orthogonal to the indoor and outdoor directions and is along the horizontal plane. The outer wall 2 is along the horizontal member 3. That is, the horizontal member 3 faces the indoor side surface of the outer wall 2. The horizontal member 3 is arranged at a distance from the outer wall 2. However, the horizontal member 3 and the outer wall 2 may be in contact with each other.

横架材３としては、例えば、梁、桁、胴差し等が挙げられる。横架材３は、本実施形態では金属製であり、例えば、山形鋼、Ｉ形鋼、ＣＴ形鋼、角形鋼管、鋼管、溝形鋼、Ｈ形鋼、軽溝形鋼、リップ溝形鋼、軽Ｚ形鋼、形鋼と材木との複合材料等で構成される。本実施形態では、横架材３はＨ形鋼である。横架材３は、図１に示すように、一対のフランジ３１と、一対のフランジ３１をつなぐウェブ３２と、を備える。 Examples of the horizontal member 3 include a beam, a girder, a girder, and the like. The horizontal member 3 is made of metal in this embodiment, and is, for example, angle steel, I-shaped steel, CT-shaped steel, square steel pipe, steel pipe, channel steel, H-shaped steel, light channel steel, and lip channel steel. , Light Z-shaped steel, composite material of shaped steel and timber, etc. In the present embodiment, the horizontal member 3 is H-shaped steel. As shown in FIG. 1, the horizontal member 3 includes a pair of flanges 31 and a web 32 connecting the pair of flanges 31.

横架材３のウェブ３２には、貫通孔（以下、「第二貫通孔３３」という）が形成されている。第二貫通孔３３は、ウェブ３２の厚み方向における屋内側の面から屋外側の面に至るように貫通する。第二貫通孔３３の直径は、第一貫通孔２２の直径よりも大きい。第二貫通孔３３は、第一貫通孔２２に対応する位置に形成されている。ここでいう「対応する位置」とは、第一貫通孔２２と第二貫通孔３３とが連携して、換気、配線等の機能を発揮することができる位置を意味する。本実施形態では、第二貫通孔３３が第一貫通孔２２に対して、屋内外方向の屋内側に位置している。言い換えると、屋内外方向に沿って見て、第二貫通孔３３に対して第一貫通孔２２が重なる位置にある。「重なる位置」とは、本発明では、第二貫通孔３３と第一貫通孔２２との少なくとも一部が重なっていればよい。ただし、本実施形態では、第二貫通孔３３に対して、第一貫通孔２２の全てが含まれる位置関係になっている。これにより、直線状の挿通部材９を通すことができる。 A through hole (hereinafter referred to as "second through hole 33") is formed in the web 32 of the horizontal member 3. The second through hole 33 penetrates from the indoor side surface to the outdoor side surface in the thickness direction of the web 32. The diameter of the second through hole 33 is larger than the diameter of the first through hole 22. The second through hole 33 is formed at a position corresponding to the first through hole 22. The "corresponding position" here means a position where the first through hole 22 and the second through hole 33 can cooperate with each other to exert functions such as ventilation and wiring. In the present embodiment, the second through hole 33 is located on the indoor side in the indoor / outdoor direction with respect to the first through hole 22. In other words, the first through hole 22 overlaps the second through hole 33 when viewed along the indoor and outdoor directions. In the present invention, the "overlapping position" may mean that at least a part of the second through hole 33 and the first through hole 22 overlap. However, in the present embodiment, the positional relationship is such that all of the first through holes 22 are included with respect to the second through holes 33. As a result, the linear insertion member 9 can be passed through.

一対のフランジ３１は、ウェブ３２の上下方向の端に設けられている。一対のフランジ３１は、水平面に沿っている。上側のフランジ３１には、床板４が載っている。一方、下側のフランジ３１の下面には、ラス５が取り付けられている。ラス５は、金属製の網であり、メタルラス及びワイヤラスを含む。ラス５は、複数の力骨（図示せず）を介して、下側のフランジ３１に取り付けられている。力骨は、横架材３の長手方向に一定の間隔をおいて、下側のフランジ３１の下面に取り付けられている。力骨は、例えば、金属製の丸棒であり、下側のフランジ３１と外壁２との間を架け渡す。下側のフランジ３１及び外壁２に対する力骨の取付けは、例えば、溶接、ねじ止め等により実現される。 The pair of flanges 31 are provided at the vertical ends of the web 32. The pair of flanges 31 are along the horizontal plane. A floor plate 4 is mounted on the upper flange 31. On the other hand, a lath 5 is attached to the lower surface of the lower flange 31. The lath 5 is a metal net and includes a metal lath and a wire lath. The lath 5 is attached to the lower flange 31 via a plurality of force bones (not shown). The force bones are attached to the lower surface of the lower flange 31 at regular intervals in the longitudinal direction of the cross member 3. The rib is, for example, a metal round bar that bridges between the lower flange 31 and the outer wall 2. The attachment of the force bone to the lower flange 31 and the outer wall 2 is realized by, for example, welding, screwing, or the like.

耐火材６は、横架材３を火熱から保護する。耐火材６は、屋内面被覆部６１と、筒状被覆部６２と、を備える。 The refractory material 6 protects the horizontal material 3 from the heat of fire. The refractory material 6 includes an indoor surface covering portion 61 and a tubular covering portion 62.

屋内面被覆部６１は、横架材３の屋内側の面のうち第二貫通孔３３を除く部分を被覆する。屋内面被覆部６１は、図１（Ａ）に示すように、上側のフランジ３１、ウェブ３２、下側のフランジ３１及びラス５が有する面のうち、屋内空間に臨む面を覆う。ここでいう「屋内空間に臨む面」とは、横架材３、外壁２及びラス５の施工後に、屋内側から被覆し得る面を意味する。屋内面被覆部６１は、例えば、吹き付け、巻き付け、箱貼り、８の字貼り等によって形成される。屋内面被覆部６１としては、例えば、ロックウール、けい酸カルシウム、セラミックファイバーブランケット、これらの組み合わせ等が挙げられる。 The indoor surface covering portion 61 covers the portion of the indoor side surface of the horizontal member 3 excluding the second through hole 33. As shown in FIG. 1A, the indoor surface covering portion 61 covers the surface of the upper flange 31, the web 32, the lower flange 31, and the lath 5 facing the indoor space. The term "surface facing the indoor space" as used herein means a surface that can be covered from the indoor side after the construction of the horizontal member 3, the outer wall 2, and the lath 5. The indoor surface covering portion 61 is formed by, for example, spraying, winding, box pasting, figure 8 pasting, or the like. Examples of the indoor surface covering portion 61 include rock wool, calcium silicate, a ceramic fiber blanket, and a combination thereof.

筒状被覆部６２は、第二貫通孔３３の内周面及び横架材３の屋外側に臨む面を覆う。筒状被覆部６２は、第一貫通孔２２と第二貫通孔３３を通じさせた状態で、屋内面被覆部６１と外壁２とをつなぐ。本実施形態に係る筒状被覆部６２は、外壁２が有する支持部２３と第二貫通孔３３とで支持されることで、屋内面被覆部６１と外壁２とをつないでいる。また、筒状被覆部６２は、中心軸方向の一方の端部（ここでは屋内側の端部）が固定端部であり、中心軸方向の他方の端部（ここでは屋外側の端部）が非固定端部である。固定端部は、その接続対象（ここでは屋内面被覆部６１）に対して固定された端部を意味する。非固定端部は、その接続対象（ここでは外壁２）に対して非固定である端部を意味する。これによって、筒状被覆部６２は、第二貫通孔３３が形成された横架材３の屋外側の面を覆い被せることができる。 The tubular covering portion 62 covers the inner peripheral surface of the second through hole 33 and the surface of the horizontal member 3 facing the outdoor side. The tubular covering portion 62 connects the indoor surface covering portion 61 and the outer wall 2 in a state where the first through hole 22 and the second through hole 33 are passed through. The tubular covering portion 62 according to the present embodiment connects the indoor surface covering portion 61 and the outer wall 2 by being supported by the support portion 23 and the second through hole 33 of the outer wall 2. Further, in the tubular covering portion 62, one end in the central axial direction (here, the end on the indoor side) is a fixed end, and the other end in the central axial direction (here, the end on the outdoor side). Is the non-fixed end. The fixed end means an end fixed to the connection target (here, the indoor surface covering portion 61). The non-fixed end means an end that is non-fixed to the connection target (here, the outer wall 2). As a result, the tubular covering portion 62 can cover the outdoor side surface of the horizontal member 3 in which the second through hole 33 is formed.

支持部２３は、外壁２に形成されており、筒状被覆部６２の中心軸方向の屋外側の端部（非固定端部）を支える。支持部２３の断面形状は、筒状被覆部６２を支えることができれば特に制限はなく、例えば、断面矩形状、断面略Ｔ字状、断面円形状、断面Ｌ字状、板状等の種々の形状を取り得る。本実施形態に係る支持部２３は、断面矩形状の凸部２３１によって構成されている。 The support portion 23 is formed on the outer wall 2 and supports an end portion (non-fixed end portion) on the outdoor side in the central axial direction of the tubular covering portion 62. The cross-sectional shape of the support portion 23 is not particularly limited as long as it can support the tubular covering portion 62, and for example, various cross-sectional shapes such as a rectangular cross section, a substantially T-shaped cross section, a circular cross section, an L-shaped cross section, and a plate shape are used. Can take shape. The support portion 23 according to the present embodiment is composed of a convex portion 231 having a rectangular cross section.

凸部２３１は、外壁板２１の屋内側の面から突き出ている。凸部２３１は、外壁板２１の屋内側の面に取り付けられている。外壁板２１に対する凸部２３１の取付けは、例えば、接着、ねじ止め、釘による留め付け、溶接、溶着、ピン、嵌め込み等により実現される。なお、本実施形態に係る凸部２３１は、外壁板２１とは別部材であるが、外壁板２１の屋内側の面から突き出した当該面の一部によって構成されてもよい。 The convex portion 231 protrudes from the indoor surface of the outer wall plate 21. The convex portion 231 is attached to the indoor side surface of the outer wall plate 21. The attachment of the convex portion 231 to the outer wall plate 21 is realized by, for example, bonding, screwing, fastening with nails, welding, welding, pins, fitting, and the like. Although the convex portion 231 according to the present embodiment is a separate member from the outer wall plate 21, it may be composed of a part of the surface protruding from the indoor surface of the outer wall plate 21.

凸部２３１は、外壁２の屋内側の面における第一貫通孔２２の周縁部に形成されている。凸部２３１は、筒状被覆部６２の内周面に沿って配置され、筒状被覆部６２の内周面が載ることで、筒状被覆部６２の中心軸方向の屋外側の端部を支えることができる。凸部２３１は、図１（Ｂ）に示すように、第一貫通孔２２の周縁に沿って、全周にわたって連続しており、屋内外方向に沿って見て、第一貫通孔２２に同心状でかつ略円環状に形成されている。凸部２３１の外周面は、筒状被覆部６２の内周面に対向しており、本実施形態では、凸部２３１の外周面の全ては、筒状被覆部６２の内周面に接触している。ただし、本発明では、凸部２３１は、少なくとも上端部が筒状被覆部６２の内周面に接していればよい。また、凸部２３１は、円環状でなくてもよく、全周にわたって連続せず、第一貫通孔２２の周縁部に沿って部分的に設けられてもよい。これについては、後述の変形例２，３で説明する。 The convex portion 231 is formed on the peripheral edge portion of the first through hole 22 on the indoor side surface of the outer wall 2. The convex portion 231 is arranged along the inner peripheral surface of the tubular covering portion 62, and the inner peripheral surface of the tubular covering portion 62 is placed on the convex portion 231 so that the end portion on the outdoor side in the central axial direction of the tubular covering portion 62 is placed. Can be supported. As shown in FIG. 1 (B), the convex portion 231 is continuous over the entire circumference along the peripheral edge of the first through hole 22, and is concentric with the first through hole 22 when viewed along the indoor and outdoor directions. It is shaped and formed in a substantially annular shape. The outer peripheral surface of the convex portion 231 faces the inner peripheral surface of the tubular covering portion 62, and in the present embodiment, all the outer peripheral surfaces of the convex portion 231 are in contact with the inner peripheral surface of the tubular covering portion 62. ing. However, in the present invention, at least the upper end of the convex portion 231 may be in contact with the inner peripheral surface of the tubular covering portion 62. Further, the convex portion 231 does not have to be annular, and may not be continuous over the entire circumference and may be partially provided along the peripheral edge portion of the first through hole 22. This will be described in Modifications 2 and 3 described later.

凸部２３１は、耐火性を有する。本明細書でいう「耐火性を有する」とは、火事による火熱によって、溶融、損壊しない程度の耐火性を有することを意味する。凸部２３１は、耐火材６と同じ材料で構成されており、例えば、ロックウール、けい酸カルシウム、セラミックファイバーブランケット、これらの組み合わせ等で構成されている。なお、凸部２３１は、耐火材６とは異なる材料で構成されてもよい。 The convex portion 231 has fire resistance. As used herein, the term "having fire resistance" means having fire resistance to such an extent that it is not melted or damaged by the heat of a fire. The convex portion 231 is made of the same material as the refractory material 6, and is made of, for example, rock wool, calcium silicate, a ceramic fiber blanket, a combination thereof, and the like. The convex portion 231 may be made of a material different from that of the refractory material 6.

筒状被覆部６２は、筒状に形成されている。筒状被覆部６２の外径は、第二貫通孔３３の内径と略同じである。筒状被覆部６２の内径は、第一貫通孔２２の内径よりも大きい。筒状被覆部６２は、施工した状態で筒状であればよく、例えば、平板状の耐火材を筒状に変形させ、ワイヤ等の結束線で筒状に保ち、第二貫通孔３３に通してもよい。また、筒状被覆部６２は、パイプを半割にした一対の半割体を、パイプ状に合わせた状態で、結束線で筒状に形成してもよい。 The tubular covering portion 62 is formed in a tubular shape. The outer diameter of the tubular covering portion 62 is substantially the same as the inner diameter of the second through hole 33. The inner diameter of the tubular covering portion 62 is larger than the inner diameter of the first through hole 22. The tubular covering portion 62 may be tubular as long as it is constructed. For example, a flat plate-shaped refractory material is deformed into a tubular shape, kept in a tubular shape with a binding wire such as a wire, and passed through a second through hole 33. You may. Further, the tubular covering portion 62 may be formed in a tubular shape by a binding wire in a state where a pair of half-split bodies obtained by splitting a pipe in half are aligned in a pipe shape.

筒状被覆部６２は耐火性を有する。筒状被覆部６２は、例えば、ロックウール、けい酸カルシウム板、セラミックファイバーブランケット、巻付け耐火被覆材、コンクリート、発泡コンクリート、超軽量カルダンモルタル、石膏ボード系、耐火塗料を塗布したり熱膨張性耐火シートを貼り付けたりした鋼材等により構成されている。 The tubular covering portion 62 has fire resistance. The tubular covering portion 62 is coated with, for example, rock wool, calcium silicate board, ceramic fiber blanket, wrapping fireproof coating material, concrete, foamed concrete, ultra-lightweight cardan mortar, gypsum board system, fireproof paint, or is thermally expandable. It is made of steel with a refractory sheet attached.

筒状被覆部６２は、所定の曲げ強度を有する。「所定の曲げ強度」とは、中心軸を水平面に沿わせ、中心軸方向の両端部を支えた状態で、中央部が折れない程度の強度を意味する。 The tubular covering portion 62 has a predetermined bending strength. The "predetermined bending strength" means a strength to which the central portion is not broken while the central axis is aligned with the horizontal plane and both ends in the central axis direction are supported.

筒状被覆部６２は、支持部２３と第二貫通孔３３の内周面とで支持される。このとき、筒状被覆部６２は、中心軸方向の屋外側の端部（非固定端部）は、支持部２３に対して載るだけで外壁２に接続されており、支持部２３に対し、屋内外方向に移動可能に支持されている。すなわち、筒状被覆部６２の中心軸方向の屋外側の端部は、外壁２に対して非固定である。これによって、外壁２が屋外の負圧又は正圧によって変形しても、当該変形に筒状被覆部６２が追従しにくく、外壁２の変形に影響を受けにくい。この結果、筒状被覆部６２の損傷を防ぐことができる。一方、筒状被覆部６２の中心軸方向の屋内側の端部（固定端部）は、第二貫通孔３３に対して固定部７によって固定されており、屋内面被覆部６１に接続されている。 The tubular covering portion 62 is supported by the support portion 23 and the inner peripheral surface of the second through hole 33. At this time, in the tubular covering portion 62, the end portion (non-fixed end portion) on the outdoor side in the central axial direction is connected to the outer wall 2 only by being mounted on the support portion 23, and the tubular covering portion 62 is connected to the support portion 23 with respect to the support portion 23. It is supported so that it can be moved indoors and outdoors. That is, the end portion of the tubular covering portion 62 on the outdoor side in the central axis direction is not fixed to the outer wall 2. As a result, even if the outer wall 2 is deformed by an outdoor negative pressure or positive pressure, the tubular covering portion 62 is less likely to follow the deformation and is less likely to be affected by the deformation of the outer wall 2. As a result, damage to the tubular covering portion 62 can be prevented. On the other hand, the indoor end (fixed end) of the tubular covering portion 62 in the central axial direction is fixed to the second through hole 33 by the fixing portion 7 and is connected to the indoor surface covering portion 61. There is.

筒状被覆部６２の屋外側の端面は、外壁２の屋内側の面に対し、僅かな隙間を介して対向している。しかし、円環状の凸部２３１が筒状被覆部６２と外壁２との間の隙間を覆うため、耐火性を損なうことがない。本発明では、筒状被覆部６２の屋外側の端面は、外壁２の屋内側の面に対して接触していてもよい。 The outdoor side end surface of the tubular covering portion 62 faces the indoor side surface of the outer wall 2 with a slight gap. However, since the annular convex portion 231 covers the gap between the tubular covering portion 62 and the outer wall 2, the fire resistance is not impaired. In the present invention, the end surface on the outdoor side of the tubular covering portion 62 may be in contact with the indoor surface of the outer wall 2.

固定部７は、図１（Ａ）に示すように、屋内面被覆部６１に対して筒状被覆部６２の中心軸方向の屋内側の端部を固定する。固定部７は、複数（ここでは三つ）のくさび部材７１を含む。本実施形態に係る固定部７は、第二貫通孔３３に筒状被覆部６２を通し、複数のくさび部材７１を嵌め込むことで、第二貫通孔３３に筒状被覆部６２を固定し、これにより、屋内面被覆部６１に対して筒状被覆部６２を固定する。くさび部材７１は、略三角形状に形成されている。くさび部材７１は、第二貫通孔３３の内周面と筒状被覆部６２の外周面との間に嵌め込まれ、これによって、第二貫通孔３３に対して、筒状被覆部６２を固定することができる。複数のくさび部材７１は、第二貫通孔３３の内周面に沿って一定の間隔をおいて配置されている。 As shown in FIG. 1A, the fixing portion 7 fixes the end portion of the tubular covering portion 62 on the indoor side in the central axial direction to the indoor surface covering portion 61. The fixing portion 7 includes a plurality of (here, three) wedge members 71. In the fixing portion 7 according to the present embodiment, the tubular covering portion 62 is passed through the second through hole 33 and a plurality of wedge members 71 are fitted to fix the tubular covering portion 62 to the second through hole 33. As a result, the tubular covering portion 62 is fixed to the indoor surface covering portion 61. The wedge member 71 is formed in a substantially triangular shape. The wedge member 71 is fitted between the inner peripheral surface of the second through hole 33 and the outer peripheral surface of the tubular covering portion 62, whereby the tubular covering portion 62 is fixed to the second through hole 33. be able to. The plurality of wedge members 71 are arranged at regular intervals along the inner peripheral surface of the second through hole 33.

本実施形態に係るくさび部材７１は、略三角形状に形成されているが、本発明では、「くさび部材７１」は、くさび部材７１の一方向において一方の端部から他方の端部にかけて厚さが薄くなるものであればよい。したがって、くさび部材７１としては、略三角形状のほか、例えば、台形状、隅丸三角形状、隅丸台形状等に形成されてもよいし、錘状に形成されてもよい。また、固定部７は、くさび部材７１に限らず、例えば、接着剤、くぎ、ねじ、ピン等であってもよい。 The wedge member 71 according to the present embodiment is formed in a substantially triangular shape, but in the present invention, the "wedge member 71" has a thickness from one end to the other in one direction of the wedge member 71. Anything that becomes thinner will do. Therefore, the wedge member 71 may be formed in a substantially triangular shape, for example, a trapezoidal shape, a rounded corner triangular shape, a rounded corner trapezoidal shape, or the like, or may be formed in a weight shape. Further, the fixing portion 7 is not limited to the wedge member 71, and may be, for example, an adhesive, a nail, a screw, a pin, or the like.

本実施形態に係る耐火構造１では、横架材３、ラス５、外壁２、床板４等の躯体の施工を行った後、挿通部材９の施工前に耐火材６の施工を行う。耐火材６の施工では、施工者は、横架材３の第二貫通孔３３に対し、筒状被覆部６２を屋内側から通し、筒状被覆部６２の中心軸方向の屋外側の端部を支持部２３に載せると共に、筒状被覆部６２の屋内側の端部を第二貫通孔３３の内周面に載せる。 In the fireproof structure 1 according to the present embodiment, after the skeleton such as the horizontal member 3, the lath 5, the outer wall 2, and the floor plate 4 is constructed, the fireproof material 6 is constructed before the insertion member 9. In the construction of the refractory material 6, the builder passes the tubular covering portion 62 through the second through hole 33 of the horizontal member 3 from the indoor side, and the end portion of the tubular covering portion 62 on the outdoor side in the central axial direction. Is placed on the support portion 23, and the indoor end portion of the tubular covering portion 62 is placed on the inner peripheral surface of the second through hole 33.

この後、施工者は、固定部７によって、筒状被覆部６２の中心軸方向の屋内側の端部を横架材３に対して固定する。そして、施工者は、横架材３に対して、屋内面被覆部６１を施工する。躯体の施工及び耐火材６の施工を行った後、ダクト等の挿通部材９が取り付けられる。 After that, the builder fixes the end portion of the tubular covering portion 62 on the indoor side in the central axial direction to the horizontal member 3 by the fixing portion 7. Then, the builder constructs the indoor surface covering portion 61 on the horizontal member 3. After the construction of the skeleton and the construction of the refractory material 6, the insertion member 9 such as a duct is attached.

挿通部材９は、第二貫通孔３３及び第一貫通孔２２に通される中空な部材であって、対象物を屋内と屋外との間で移動させるための部材である。ここでいう「対象物」には、電気配線（例えば、通信用電線、送電線、電話線等）といった形状をもつものほか、気体（例えば、空気、煙、水蒸気等）も含まれる。挿通部材９としては、例えば、排気や給気のための通気ダクト、配線用のダクト、ドレン管等が挙げられる。挿通部材９は、直管部９１と、換気口９２と、を備える。 The insertion member 9 is a hollow member that is passed through the second through hole 33 and the first through hole 22, and is a member for moving an object between indoors and outdoors. The "object" here includes not only those having a shape such as electric wiring (for example, communication electric wire, transmission line, telephone line, etc.) but also gas (for example, air, smoke, water vapor, etc.). Examples of the insertion member 9 include a ventilation duct for exhaust and air supply, a duct for wiring, a drain pipe, and the like. The insertion member 9 includes a straight pipe portion 91 and a ventilation port 92.

直管部９１は、屋内外方向に一直線に沿って延びた部分である。直管部９１は、パイプによって構成されている。直管部９１は、例えば、排気フード等の排気装置や、乾燥機等の負荷装置に通じている。直管部９１の屋内側の端部は、エルボ等の継手が適宜接続されたり、曲げられたりして、負荷装置につながるパイプに接続されるか、直接的に負荷装置に接続される。直管部９１は、例えば、排気フード等の排気装置や、乾燥機等に通じている。直管部９１の材質は、特に制限はなく、例えば、金属、合成樹脂、チューブ等により構成される。 The straight pipe portion 91 is a portion extending along a straight line in the indoor and outdoor directions. The straight pipe portion 91 is composed of pipes. The straight pipe portion 91 is connected to, for example, an exhaust device such as an exhaust hood and a load device such as a dryer. The indoor end of the straight pipe portion 91 is connected to a pipe connected to the load device by appropriately connecting or bending a joint such as an elbow, or is directly connected to the load device. The straight pipe portion 91 is connected to, for example, an exhaust device such as an exhaust hood, a dryer, or the like. The material of the straight pipe portion 91 is not particularly limited, and is made of, for example, a metal, a synthetic resin, a tube, or the like.

直管部９１は、図１（Ａ）に示すように、第二貫通孔３３、筒状被覆部６２及び第一貫通孔２２を通るように配置される。直管部９１と筒状被覆部６２との間は、隙間を介して離れている。このため、施工者は、挿通部材９を施工する際に、直管部９１を筒状被覆部６２に通しやすく施工性がよい。直管部９１の屋外側の端部には、換気口９２が取り付けられている。 As shown in FIG. 1A, the straight pipe portion 91 is arranged so as to pass through the second through hole 33, the tubular covering portion 62, and the first through hole 22. The straight pipe portion 91 and the tubular covering portion 62 are separated from each other through a gap. Therefore, the installer can easily pass the straight pipe portion 91 through the tubular covering portion 62 when constructing the insertion member 9, and the workability is good. A ventilation port 92 is attached to the outdoor end of the straight pipe portion 91.

換気口９２は、外壁面に沿って取り付けられており、直管部９１に通じている。換気口９２には、空気の流量を制御するダンパ（防火ダンパ）が内蔵されていてもよい。また、換気口９２にはフィルタが取り付けられていてもよい。 The ventilation port 92 is attached along the outer wall surface and leads to the straight pipe portion 91. The ventilation port 92 may have a built-in damper (fireproof damper) that controls the flow rate of air. Further, a filter may be attached to the ventilation port 92.

以上説明したように、本実施形態に係る耐火構造１では、横架材３が屋内面被覆部６１と筒状被覆部６２とで覆われている。このため、屋内で火事等が生じても、横架材３の屋内側からの火熱に対し、屋内面被覆部６１によって横架材３への熱伝導を防ぐことができるうえに、第二貫通孔３３を通った火熱に対しても、筒状被覆部６２によって横架材３への熱伝導を防ぐことができる。 As described above, in the fireproof structure 1 according to the present embodiment, the horizontal member 3 is covered with the indoor surface covering portion 61 and the tubular covering portion 62. Therefore, even if a fire or the like occurs indoors, the indoor surface covering portion 61 can prevent heat conduction to the horizontal member 3 against the heat from the indoor side of the horizontal member 3, and the second penetration. Even with respect to the heat of fire that has passed through the hole 33, the tubular covering portion 62 can prevent heat conduction to the horizontal member 3.

また、筒状被覆部６２の中心軸方向の屋外側の端部は、支持部２３に対し、屋内外方向に移動可能に支持されているため、外壁２が負圧又は正圧によって変形しても、筒状被覆部６２は影響を受けにくい。一方、筒状被覆部６２の中心軸方向の屋内側の端部が、固定部７によって横架材３に固定されている。このため、仮に筒状被覆部６２又は／及び第二貫通孔３３の製造誤差が生じても、筒状被覆部６２が横架材３から脱落するのを防ぐことができる。 Further, since the end portion of the tubular covering portion 62 on the outdoor side in the central axis direction is movably supported by the support portion 23 in the indoor / outdoor direction, the outer wall 2 is deformed by negative pressure or positive pressure. However, the tubular covering portion 62 is not easily affected. On the other hand, the indoor end of the tubular covering portion 62 in the central axis direction is fixed to the horizontal member 3 by the fixing portion 7. Therefore, even if a manufacturing error occurs in the tubular covering portion 62 and / and the second through hole 33, it is possible to prevent the tubular covering portion 62 from falling off from the horizontal member 3.

また、支持部２３は、第一貫通孔２２の周縁に沿って全周にわたって連続しているため、例えば、外壁２の変形によって、筒状被覆部６２と外壁２の屋内側の面との間に間隙が生じても、支持部２３によって当該間隙が覆われる。したがって、この場合でも、外壁２の屋内側の面と筒状被覆部６２との間の間隙から火熱が侵入するのを防ぐことができる。 Further, since the support portion 23 is continuous over the entire circumference along the peripheral edge of the first through hole 22, for example, due to the deformation of the outer wall 2, between the tubular covering portion 62 and the indoor surface of the outer wall 2. Even if a gap is formed in the gap, the gap is covered by the support portion 23. Therefore, even in this case, it is possible to prevent the heat from entering through the gap between the indoor surface of the outer wall 2 and the tubular covering portion 62.

（２）変形例
上記実施形態は、本発明の様々な実施形態の一つに過ぎない。実施形態は、本発明の目的を達成できれば、設計等に応じて種々の変更が可能である。以下、実施形態の変形例を説明する。以下に説明する変形例は、適宜組み合わせて適用可能である。 (2) Modified Example The above embodiment is only one of various embodiments of the present invention. The embodiment can be variously changed according to the design and the like as long as the object of the present invention can be achieved. Hereinafter, a modified example of the embodiment will be described. The modifications described below can be applied in combination as appropriate.

（２．１）変形例１
変形例１に係る耐火構造１は、支持部２３の断面形状が略Ｌ字状である点、支持部２３が第一貫通孔２２の周縁に沿って部分的に形成されている点で、上記実施形態とは相違する。なお、変形例１に係る耐火構造１に関し、上記実施形態に係る耐火構造１と同様の構成については、同一の符号を付して説明を省略する。 (2.1) Modification 1
The fireproof structure 1 according to the first modification is described above in that the cross-sectional shape of the support portion 23 is substantially L-shaped, and the support portion 23 is partially formed along the peripheral edge of the first through hole 22. It differs from the embodiment. Regarding the fireproof structure 1 according to the modified example 1, the same components as those of the fireproof structure 1 according to the above embodiment are designated by the same reference numerals and the description thereof will be omitted.

支持部２３は、図２（Ｂ）に示すように、複数（ここでは三つ）の留付け具２３２によって構成されている。複数の留付け具２３２は、第一貫通孔２２の周縁に沿って、一定の間隔をおいて外壁板２１に取り付けられている。第一貫通孔２２の中心と留付け具２３２とを結ぶ仮想線同士のなす角は、約１２０°である。 As shown in FIG. 2B, the support portion 23 is composed of a plurality of (here, three) fasteners 232. The plurality of fasteners 232 are attached to the outer wall plate 21 at regular intervals along the peripheral edge of the first through hole 22. The angle formed by the virtual lines connecting the center of the first through hole 22 and the fastener 232 is about 120 °.

各留付け具２３２は、図２（Ａ）に示すように、固定片２３４と、支持片２３５と、を備える。留付け具２３２は、固定片２３４と支持片２３５とによって、断面略Ｌ字状に形成されている。固定片２３４は外壁板２１の屋内側の面に取り付けられている。支持片２３５は、固定片２３４における第一貫通孔２２の径方向の外側の端部から、屋内外方向の屋内側に突出している。支持片２３５には、筒状被覆部６２の内周面が載っている。これによって、複数の留付け具２３２は、筒状被覆部６２の中心軸方向の屋外側の端部を支持している。 As shown in FIG. 2A, each fastener 232 includes a fixing piece 234 and a support piece 235. The fastener 232 is formed by the fixing piece 234 and the support piece 235 in a substantially L-shaped cross section. The fixing piece 234 is attached to the indoor side surface of the outer wall plate 21. The support piece 235 projects from the radial outer end of the first through hole 22 in the fixed piece 234 to the indoor side in the indoor / outdoor direction. The inner peripheral surface of the tubular covering portion 62 is mounted on the support piece 235. As a result, the plurality of fasteners 232 support the end portion of the tubular covering portion 62 on the outdoor side in the central axial direction.

支持部２３は、三つの留付け具２３２のうちの少なくとも一つが、筒状被覆部６２の荷重を支えることができればよい。本変形例では、上側の二つの留付け具２３２が筒状被覆部６２の荷重を支えており、下側の一つの留付け具２３２によって、例えば、固定部７を嵌め込む際に筒状被覆部６２が動くのを抑えることができる。上側の二つの留付け具２３２は、支持片２３５の厚み方向の面（主面）のうち、上側の面が筒状被覆部６２の内周面に接している。下側の一つの留付け具２３２は、支持片２３５の主面のうち、下側の面が筒状被覆部６２の内周面に接している。 The support portion 23 suffices as long as at least one of the three fasteners 232 can support the load of the tubular covering portion 62. In this modification, the upper two fasteners 232 support the load of the tubular covering portion 62, and the lower one fastener 232, for example, when fitting the fixing portion 7, the tubular coating. It is possible to suppress the movement of the portion 62. Of the surfaces (main surfaces) in the thickness direction of the support piece 235, the upper surface of the two upper fasteners 232 is in contact with the inner peripheral surface of the tubular covering portion 62. In the lower fastener 232, the lower surface of the main surface of the support piece 235 is in contact with the inner peripheral surface of the cylindrical covering portion 62.

なお、本変形例では、支持部２３が、三つの留付け具２３２で構成されているが、上側の二つの留付け具２３２のみで構成されてもよい。また、筒状被覆部６２の上端部を支える一つの留付け具２３２のみで構成されてもよい。 In this modification, the support portion 23 is composed of three fasteners 232, but may be composed of only the upper two fasteners 232. Further, it may be composed of only one fastener 232 that supports the upper end portion of the tubular covering portion 62.

変形例１に係る留付け具２３２では、固定片２３４における第一貫通孔２２の径方向の外側の端部から支持片２３５が突出していたが、図３（Ａ）に示すように、支持片２３５は、固定片２３４における第一貫通孔２２の径方向の内側の端部から突出してもよい。 In the fastener 232 according to the first modification, the support piece 235 protrudes from the radial outer end of the first through hole 22 in the fixed piece 234, but as shown in FIG. 3 (A), the support piece The 235 may project from the radially inner end of the first through hole 22 in the fixed piece 234.

また、支持部２３が複数の留付け具２３２で構成される場合、負圧又は正圧によって外壁２が変形すると、外壁２の屋内側の面と筒状被覆部６２との間に間隙が生じる場合がある。この場合に、火熱が第二貫通孔３３及び筒状被覆部６２を通ると、外壁２の屋内側の面と筒状被覆部６２との間の間隙から火熱が侵入する可能性がある。この場合、図３（Ｂ）に示すように、外壁２の屋内側の面と筒状被覆部６２との間（つまり、非固定端部とその接続対象との間）に、膨張部材８が配置されることが好ましい。 Further, when the support portion 23 is composed of a plurality of fasteners 232, when the outer wall 2 is deformed by negative pressure or positive pressure, a gap is generated between the indoor surface of the outer wall 2 and the tubular covering portion 62. In some cases. In this case, when the thermal heat passes through the second through hole 33 and the tubular covering portion 62, the thermal heat may enter through the gap between the indoor surface of the outer wall 2 and the tubular covering portion 62. In this case, as shown in FIG. 3B, the expansion member 8 is provided between the indoor surface of the outer wall 2 and the cylindrical covering portion 62 (that is, between the non-fixed end portion and the connection target thereof). It is preferable to be arranged.

膨張部材８は、所定温度で加熱されると膨張する。「所定温度」は、火事の際の火熱の温度を意味する。所定温度は、例えば、２００℃以上である。膨張部材８は、例えば、膨張黒鉛と熱可塑性エラストマとを含有する。熱可塑性エラストマとしては、例えば、塩化ビニル系熱可塑性エラストマ、スチレン系熱可塑性エラストマ、オレフィン系熱可塑性エラストマ、ポリエーテル樹脂系熱可塑性エラストマ（例えば、関西ペイント株式会社製 耐火テクト（登録商標））、アクリル樹脂系熱可塑性エラストマ（例えば、日本ペイント株式会社製 タイカリット（登録商標））等が挙げられる。熱可塑性エラストマは、一種を用いてもよいし、これら複数種を組み合わせて用いられてもよい。 The expansion member 8 expands when heated at a predetermined temperature. "Predetermined temperature" means the temperature of the heat of fire in the event of a fire. The predetermined temperature is, for example, 200 ° C. or higher. The expansion member 8 contains, for example, expanded graphite and a thermoplastic elastomer. Examples of the thermoplastic elastomer include vinyl chloride-based thermoplastic elastomer, styrene-based thermoplastic elastomer, olefin-based thermoplastic elastomer, polyether resin-based thermoplastic elastomer (for example, Fireproof Tect (registered trademark) manufactured by Kansai Paint Co., Ltd.), and the like. Examples thereof include an acrylic resin-based thermoplastic elastomer (for example, Tycalit (registered trademark) manufactured by Nippon Paint Co., Ltd.). The thermoplastic elastomer may be used alone or in combination of a plurality of these types.

膨張部材８は、筒状被覆部６２の屋外側の端面に接着などによって固定され、かつ外壁２の屋内側の面に非固定であってもよいし、外壁２の屋内側の面に固定され、かつ筒状被覆部６２に非固定であってもよい。また、リング状に形成された膨張部材８を、筒状被覆部６２と外壁２との間に位置させるだけであってもよく、筒状被覆部６２と外壁２との両方に非固定であってもよい。また、膨張部材８は、耐火性を有する塗料（耐火塗料）によって構成されてもよい。この場合、耐火塗料を、筒状被覆部６２の端部に塗布してもよいし、外壁２の屋内側の面のうちの筒状被覆部６２に対向する箇所に塗布してもよい。 The expansion member 8 may be fixed to the outdoor end surface of the tubular covering portion 62 by adhesion or the like, and may not be fixed to the indoor side surface of the outer wall 2, or may be fixed to the indoor side surface of the outer wall 2. , And may not be fixed to the tubular covering portion 62. Further, the expansion member 8 formed in a ring shape may be simply positioned between the cylindrical covering portion 62 and the outer wall 2, and is not fixed to both the tubular covering portion 62 and the outer wall 2. You may. Further, the expansion member 8 may be made of a paint having fire resistance (fireproof paint). In this case, the refractory paint may be applied to the end portion of the tubular covering portion 62, or may be applied to a portion of the indoor surface of the outer wall 2 facing the tubular covering portion 62.

これによって、支持部２３が複数の留付け具２３２で構成される場合であっても、効果的に、横架材３を火熱から守ることができる。なお、当該膨張部材８は、上記実施形態のように、支持部２３が第一貫通孔２２の周縁の全長にわたって連続して形成された構造に対して適用してもよい。この場合、実施形態及び変形例１の構造に比べて、より一層、横架材３の耐火性を向上させることができる。 Thereby, even when the support portion 23 is composed of a plurality of fasteners 232, the horizontal member 3 can be effectively protected from heat and heat. The expansion member 8 may be applied to a structure in which the support portion 23 is continuously formed over the entire length of the peripheral edge of the first through hole 22, as in the above embodiment. In this case, the fire resistance of the horizontal member 3 can be further improved as compared with the structures of the embodiment and the modified example 1.

（２．２）変形例２
上記実施形態に係る支持部２３は、筒状被覆部６２の内周面を支えていたが、変形例２に係る耐火構造１は、図４（Ａ）に示すように、支持部２３が筒状被覆部６２の外周面を支えている点で、上記実施形態とは相違する。その他の構造は、上記実施形態と同じである。 (2.2) Modification 2
The support portion 23 according to the above embodiment supported the inner peripheral surface of the tubular covering portion 62, but in the fireproof structure 1 according to the modified example 2, the support portion 23 has a cylinder as shown in FIG. 4 (A). It differs from the above embodiment in that it supports the outer peripheral surface of the shape covering portion 62. Other structures are the same as those in the above embodiment.

本変形例に係る支持部２３は、筒状被覆部６２の外周面に当たり、これによって筒状被覆部６２を屋内外方向に移動可能に支持している。支持部２３は、上記実施形態と同様、耐火性を有する材料で構成されている。支持部２３は、上記実施形態１と同様、断面矩形状の凸部２３１で構成されてもよいし（図４（Ａ））、断面略Ｌ字状の留付け具２３２で構成されてもよい（図４（Ｂ））。 The support portion 23 according to this modification hits the outer peripheral surface of the tubular covering portion 62, thereby supporting the tubular covering portion 62 so as to be movable in the indoor / outdoor direction. The support portion 23 is made of a material having fire resistance as in the above embodiment. Similar to the first embodiment, the support portion 23 may be composed of a convex portion 231 having a rectangular cross section (FIG. 4A), or may be composed of a fastener 232 having a substantially L-shaped cross section. (FIG. 4 (B)).

また、本変形例においても、外壁２の屋内側の面と筒状被覆部６２との間に、膨張部材８が設けられてもよい（図３（Ｂ）参照）。 Further, also in this modification, the expansion member 8 may be provided between the indoor side surface of the outer wall 2 and the tubular covering portion 62 (see FIG. 3B).

（２．３）変形例３
上記実施形態に係る支持部２３は、外壁２の屋内側の面から突き出た凸部２３１であったが、変形例３に係る耐火構造１は、図５に示すように、支持部２３が外壁２に形成された溝２３３である点で、上記実施形態とは相違する。その他の構造は、上記実施形態と同じである。 (2.3) Modification 3
The support portion 23 according to the above embodiment is a convex portion 231 protruding from the indoor side surface of the outer wall 2, but in the fireproof structure 1 according to the modified example 3, the support portion 23 is an outer wall as shown in FIG. It differs from the above embodiment in that it is a groove 233 formed in 2. Other structures are the same as those in the above embodiment.

溝２３３は、図５に示すように、外壁２の屋内側の面から凹んでいる。溝２３３は、第一貫通孔２２の周縁に沿って、全周にわたって連続しており、屋内外方向に沿って見て、第一貫通孔２２に同心状でかつ略円環状に形成されている。溝２３３には、筒状被覆部６２の中心軸方向の屋外側の端部が差し込まれている。これによって、筒状被覆部６２の中心軸方向の屋外側の端部は、支持部２３によって、屋内外方向に移動可能に支持されている。 As shown in FIG. 5, the groove 233 is recessed from the indoor side surface of the outer wall 2. The groove 233 is continuous over the entire circumference along the peripheral edge of the first through hole 22, and is formed concentrically and substantially in an annular shape in the first through hole 22 when viewed along the indoor and outdoor directions. .. An outdoor end portion of the tubular covering portion 62 in the central axial direction is inserted into the groove 233. As a result, the end portion of the tubular covering portion 62 on the outdoor side in the central axis direction is movably supported by the support portion 23 in the indoor / outdoor direction.

なお、本変形例においても、外壁２の屋内側の面と筒状被覆部６２との間に、膨張部材８が設けられてもよい（図３（Ｂ）参照）。 Also in this modification, the expansion member 8 may be provided between the indoor side surface of the outer wall 2 and the tubular covering portion 62 (see FIG. 3B).

（２．４）変形例４
上記実施形態に係る耐火構造１では、屋内面被覆部６１が、横架材３に対して吹き付けによって形成されたが、変形例４に係る耐火構造１では、屋内面被覆部６１は、箱貼りによって構成されている。屋内面被覆部６１は、図６に示すように、第一被覆板６１１と、第二被覆板６１２と、で構成されている。 (2.4) Modification 4
In the fireproof structure 1 according to the above embodiment, the indoor surface covering portion 61 is formed by spraying on the horizontal member 3, but in the fireproof structure 1 according to the modified example 4, the indoor surface covering portion 61 is attached to a box. It is composed of. As shown in FIG. 6, the indoor surface covering portion 61 is composed of a first covering plate 611 and a second covering plate 612.

第一被覆板６１１は、横架材３に対し、屋内外方向の屋内側に配置されている。第一被覆板６１１は、鉛直面に沿っており、上端が床板４に接続されている。第一被覆板６１１には、筒状被覆部６２に通じる開口部６１３が形成されている。開口部６１３の径は、筒状被覆部６２の内径と略同じ寸法に形成されている。筒状被覆部６２の軸方向の屋内側の端部は、第一被覆板６１１に接続されている（つまり、筒状被覆部６２の固定端部の接続対象は第一被覆板６１１である）。 The first covering plate 611 is arranged on the indoor side in the indoor / outdoor direction with respect to the horizontal member 3. The first covering plate 611 is along the vertical plane, and the upper end thereof is connected to the floor plate 4. The first covering plate 611 is formed with an opening 613 leading to the tubular covering portion 62. The diameter of the opening 613 is formed to be substantially the same as the inner diameter of the tubular covering portion 62. The axially indoor end of the tubular covering 62 is connected to the first covering plate 611 (that is, the connection target of the fixed end of the tubular covering 62 is the first covering plate 611). ..

第二被覆板６１２は、横架材３に対し、下側に配置されている。第二被覆板６１２は水平面に沿っており、第一被覆板６１１の下端部と外壁２の屋内側の面との間を塞ぐ。第二被覆板６１２の屋外側の端部は、帯材２４を介して外壁２に固定されている。第二被覆板６１２の屋内側の端部は、第一被覆板６１１に固定されている。 The second covering plate 612 is arranged below the horizontal member 3. The second covering plate 612 is along the horizontal plane and closes between the lower end portion of the first covering plate 611 and the indoor surface of the outer wall 2. The outdoor end of the second covering plate 612 is fixed to the outer wall 2 via the strip 24. The indoor end of the second covering plate 612 is fixed to the first covering plate 611.

このように、屋内面被覆部６１が箱貼りであっても、上記実施形態に係る耐火構造１と同等の効果を得ることができる。 As described above, even if the indoor surface covering portion 61 is attached to the box, the same effect as that of the fireproof structure 1 according to the above embodiment can be obtained.

（２．５）その他の変形例
以下、本実施形態のその他の変形例を列挙する。 (2.5) Other Modifications The following is a list of other modifications of the present embodiment.

上記実施形態では、外壁２の屋内側の面に形成された支持部２３に、筒状被覆部６２が載ることで、外壁２に筒状被覆部６２が接続されたが、本発明では、筒状被覆部６２の中心軸方向の屋内側の端部が屋内面被覆部６１又は第二貫通孔３３に固定されて、筒状被覆部６２が屋内面被覆部６１に片持ち梁状に支持されてもよい。この場合、筒状被覆部６２の中心軸方向の屋外側の端部は、外壁２に支持されていない（つまり、非固定である）自由端であるが、筒状被覆部６２の剛性によって、第一貫通孔２２と第二貫通孔３３とが通じた状態が保たれる。これによって、筒状被覆部６２の屋外側の端面と外壁２の屋内側の面とは、接触した状態で保たれており、互いに接続されている。なお、筒状被覆部６２の屋外側の端面と外壁２の屋内側の面との間に隙間がある場合には、当該隙間に膨張部材８が設けられてもよい。 In the above embodiment, the tubular covering portion 62 is connected to the outer wall 2 by mounting the tubular covering portion 62 on the support portion 23 formed on the indoor side surface of the outer wall 2, but in the present invention, the tubular covering portion 62 is connected to the outer wall 2. The indoor end of the shape covering portion 62 in the central axial direction is fixed to the indoor surface covering portion 61 or the second through hole 33, and the cylindrical covering portion 62 is supported by the indoor surface covering portion 61 in a cantilever shape. You may. In this case, the outdoor end of the tubular covering 62 in the central axial direction is a free end that is not supported by the outer wall 2 (that is, is not fixed), but due to the rigidity of the tubular covering 62, The state in which the first through hole 22 and the second through hole 33 are communicated with each other is maintained. As a result, the outdoor end surface of the tubular covering portion 62 and the indoor side surface of the outer wall 2 are kept in contact with each other and are connected to each other. If there is a gap between the outdoor end surface of the tubular covering portion 62 and the indoor side surface of the outer wall 2, the expansion member 8 may be provided in the gap.

屋内面被覆部６１に対する、筒状被覆部６２の中心軸方向の屋内側の端部の固定は、上記実施形態のように、第二貫通孔３３に対するくさび部材７１の嵌め込みによって実現してもよいし、屋内面被覆部６１に対して、直接、固着部材によって固定してもよい。固着部材としては、例えば、ねじ、釘、ピン、接着剤等が挙げられる。なお、屋内面被覆部６１に対し、筒状被覆部６２の屋内側の端部が固着部材によって直接的に固定され、筒状被覆部６２が片持ち梁状に支持される場合、筒状被覆部６２は、第二貫通孔３３の内周面に支えられてもよいし、支えられていなくてもよい。 The fixing of the indoor end portion of the tubular covering portion 62 in the central axial direction to the indoor surface covering portion 61 may be realized by fitting the wedge member 71 into the second through hole 33 as in the above embodiment. However, it may be directly fixed to the indoor surface covering portion 61 by a fixing member. Examples of the fixing member include screws, nails, pins, adhesives and the like. When the indoor end of the tubular covering portion 62 is directly fixed to the indoor surface covering portion 61 by a fixing member and the tubular covering portion 62 is supported in a cantilever shape, the tubular covering portion 62 is covered in a tubular shape. The portion 62 may or may not be supported by the inner peripheral surface of the second through hole 33.

上記実施形態では、筒状被覆部６２は、くさび部材７１で第二貫通孔３３に固定されることで、筒状被覆部６２の屋内側の端部が屋内面被覆部６１に対して固定されたが、屋内面被覆部６１に対し、筒状被覆部６２の屋内側の端部が固着部材によって直接的に固定される場合、くさび部材７１はなくてもよい。このとき、固定部７は、固着部材である。もちろん、固定部７として、固着部材と、くさび部材７１との両方を含んでもよい。 In the above embodiment, the tubular covering portion 62 is fixed to the second through hole 33 by the wedge member 71, so that the indoor end portion of the tubular covering portion 62 is fixed to the indoor surface covering portion 61. However, when the indoor end of the tubular covering portion 62 is directly fixed to the indoor surface covering portion 61 by the fixing member, the wedge member 71 may not be present. At this time, the fixing portion 7 is a fixing member. Of course, the fixing portion 7 may include both the fixing member and the wedge member 71.

筒状被覆部６２が支持部２３と第二貫通孔３３とで適切に支持され、筒状被覆部６２の中心軸方向の屋内側の端部と屋内面被覆部６１とが固定されていれば、くさび部材７１はなくてもよい。また、筒状被覆部６２の中心軸方向の屋内側の端部と屋内面被覆部６１とは、一体に形成されてもよい。要するに、本明細書でいう「筒状被覆部６２の中心軸方向の屋内側の端部と屋内面被覆部６１とがつながる」とは、両者が接していればよく、必ずしも、固着部材等で固定されていることを要しない。 If the tubular covering portion 62 is appropriately supported by the support portion 23 and the second through hole 33, and the indoor end portion of the tubular covering portion 62 in the central axial direction and the indoor surface covering portion 61 are fixed. , The wedge member 71 may be omitted. Further, the indoor end portion of the tubular covering portion 62 in the central axis direction and the indoor surface covering portion 61 may be integrally formed. In short, "the end of the tubular covering portion 62 on the indoor side in the central axial direction and the indoor surface covering portion 61 are connected" as used herein means that they are in contact with each other, and are not necessarily fixed members or the like. It does not need to be fixed.

上記実施形態では、第一貫通孔２２及び第二貫通孔３３には、挿通部材９が通されたが、挿通部材９はなくてもよい。例えば、第一貫通孔２２、第二貫通孔３３及び筒状被覆部６２によって、ダクトを設けることなく、通気路を構成してもよい。 In the above embodiment, the insertion member 9 is passed through the first through hole 22 and the second through hole 33, but the insertion member 9 may not be present. For example, the first through hole 22, the second through hole 33, and the tubular covering portion 62 may form a ventilation path without providing a duct.

上記実施形態に係る支持部２３は、凸部２３１が円環状に形成されていたが、例えば、断面矩形状の複数の凸部２３１が、第一貫通孔２２の周縁に沿って一定の間隔をおいて形成されてもよい。また、断面Ｌ字状の支持部２３が、第一貫通孔２２の周縁の全長にわたって連続するようにして、円環状に形成されてもよい。 In the support portion 23 according to the above embodiment, the convex portions 231 are formed in an annular shape. For example, a plurality of convex portions 231 having a rectangular cross section are spaced at regular intervals along the peripheral edge of the first through hole 22. It may be formed in place. Further, the support portion 23 having an L-shaped cross section may be formed in an annular shape so as to be continuous over the entire length of the peripheral edge of the first through hole 22.

上記実施形態に係る筒状被覆部６２は、断面円形状に形成されたが、例えば、断面四角形状、断面五角形状等の多角形状の筒体で構成されてもよい。すなわち、本明細書でいう「筒」は、円筒に限らず、四角形、五角形等の角筒も含む。 The tubular covering portion 62 according to the above embodiment is formed in a circular cross section, but may be formed of a polygonal cylinder such as a quadrangular cross section or a pentagonal cross section. That is, the "cylinder" referred to in the present specification is not limited to a cylinder, but also includes a square cylinder such as a quadrangle or a pentagon.

上記実施形態及び上記変形例では、筒状被覆部６２は、中心軸方向の屋外側の端部が非固定端部であり、屋内側の端部が固定端部であるが、これに限らず、中心軸方向の屋内側の端部が非固定端部であり、屋外側の端部が固定端部であってもよい。この場合、第二貫通孔３３の周縁に沿って支持部２３が設けられてもよいし、第一被覆板６１１に支持部２３が設けられてもよい。 In the above embodiment and the above modification, the cylindrical covering portion 62 has a non-fixed end portion on the outdoor side in the central axial direction and a fixed end portion on the indoor side, but the present invention is not limited to this. , The indoor end in the central axis direction may be a non-fixed end, and the outdoor end may be a fixed end. In this case, the support portion 23 may be provided along the peripheral edge of the second through hole 33, or the support portion 23 may be provided on the first covering plate 611.

本明細書にて、「略平行」、又は「略直交」のように「略」を伴った表現が、用いられる場合がある。例えば、「略平行」とは、実質的に「平行」であることを意味し、厳密に「平行」な状態だけでなく、数度程度の誤差を含む意味である。他の「略」を伴った表現についても同様である。 In the present specification, expressions with "abbreviation" such as "substantially parallel" or "substantially orthogonal" may be used. For example, "substantially parallel" means that it is substantially "parallel", and includes not only a strictly "parallel" state but also an error of about several degrees. The same applies to other expressions with "abbreviations".

また、本明細書において「端部」及び「端」等のように、「…部」の有無で区別した表現が用いられている。例えば、「端部」とは、「端」を含む一定の範囲を持つ部分を意味する。他の「…部」を伴った表現についても同様である。 Further, in the present specification, expressions such as "end" and "end" are used, which are distinguished by the presence or absence of "... part". For example, "edge" means a portion having a certain range including "edge". The same applies to other expressions with "... part".

（３）まとめ
以上説明したように、第１の態様に係る横架材３の耐火構造１は、貫通孔（第一貫通孔２２）を有する外壁２と、外壁２の屋内側の面に対向する横架材３と、横架材３を被覆する耐火材６と、を備える。横架材３は、貫通孔（第一貫通孔２２）に対応する位置に形成された貫通孔（第二貫通孔３３）を有する。耐火材６は、横架材３の屋内側の面のうち貫通孔（第二貫通孔３３）を除く部分を被覆する屋内面被覆部６１と、外壁２の貫通孔（第一貫通孔２２）と横架材３の貫通孔（第二貫通孔３３）を通じさせた状態で、屋内面被覆部６１と外壁２とをつなぐ筒状被覆部６２と、を有する。筒状被覆部６２は、中心軸方向の一方の端部がその接続対象に対して固定された固定端部であり、中心軸方向の他方の端部がその接続対象に対して非固定である非固定端部である。 (3) Summary As described above, the refractory structure 1 of the horizontal member 3 according to the first aspect faces the outer wall 2 having the through hole (first through hole 22) and the indoor surface of the outer wall 2. A horizontal member 3 to be used and a refractory material 6 for covering the horizontal member 3 are provided. The horizontal member 3 has a through hole (second through hole 33) formed at a position corresponding to the through hole (first through hole 22). The refractory material 6 includes an indoor surface covering portion 61 that covers a portion of the indoor surface of the horizontal member 3 excluding the through hole (second through hole 33) and a through hole (first through hole 22) of the outer wall 2. It has a tubular covering portion 62 that connects the indoor surface covering portion 61 and the outer wall 2 in a state of being passed through the through hole (second through hole 33) of the horizontal member 3. One end of the tubular covering portion 62 in the central axial direction is a fixed end portion fixed to the connection target, and the other end portion in the central axial direction is non-fixed to the connection target. It is a non-fixed end.

この態様によれば、屋内で火事等が生じても、横架材３の屋内側からの火熱に対し、屋内面被覆部６１によって横架材３への熱伝導を防ぐことができるうえに、第二貫通孔３３を通った火熱に対しても、筒状被覆部６２によって横架材３への熱伝導を防ぐことができる。しかも、筒状被覆部６２の一方の端部がその接続対象に対して非固定であるため、外壁２が変形したり振動したりなどして、横架材３と外壁２とが相対移動した場合であっても、筒状被覆部６２が損傷するのを防ぐことができる。 According to this aspect, even if a fire or the like occurs indoors, the indoor surface covering portion 61 can prevent heat conduction to the horizontal member 3 against the heat from the indoor side of the horizontal member 3. Even with respect to the heat generated through the second through hole 33, the tubular covering portion 62 can prevent heat conduction to the horizontal member 3. Moreover, since one end of the tubular covering portion 62 is not fixed to the connection target, the outer wall 2 is deformed or vibrated, and the horizontal member 3 and the outer wall 2 move relative to each other. Even in this case, it is possible to prevent the tubular covering portion 62 from being damaged.

第２の態様に係る横架材３の耐火構造１は、第１の態様において、非固定端部の接続対象は、貫通孔（第一貫通孔２２又は第二貫通孔３３）の周縁部の少なくとも一部に形成された支持部２３を有する。筒状被覆部６２の非固定端部は、中心軸方向の屋外側の端部が支持部２３によって屋内外方向に移動可能に支持されている。 In the fireproof structure 1 of the horizontal member 3 according to the second aspect, in the first aspect, the connection target of the non-fixed end portion is the peripheral portion of the through hole (first through hole 22 or second through hole 33). It has a support portion 23 formed at least in part. As for the non-fixed end portion of the tubular covering portion 62, the end portion on the outdoor side in the central axial direction is supported by the support portion 23 so as to be movable in the indoor / outdoor direction.

この態様によれば、筒状被覆部６２の非固定端部は、支持部２３によって支持されているため、筒状被覆部６２を、施工する際の施工性がよい。また、外壁２が変形しても、筒状被覆部６２が影響を受けにくく、筒状被覆部６２が損傷するのを防ぐことができる。 According to this aspect, since the non-fixed end portion of the tubular covering portion 62 is supported by the supporting portion 23, the workability when constructing the tubular covering portion 62 is good. Further, even if the outer wall 2 is deformed, the tubular covering portion 62 is not easily affected, and the tubular covering portion 62 can be prevented from being damaged.

第３の態様に係る横架材３の耐火構造１では、第２の態様において、支持部２３は、貫通孔（第一貫通孔２２又は第二貫通孔３３）の周縁に沿って全周にわたって連続している。 In the fireproof structure 1 of the horizontal member 3 according to the third aspect, in the second aspect, the support portion 23 extends over the entire circumference along the peripheral edge of the through hole (first through hole 22 or second through hole 33). It is continuous.

この態様によれば、筒状被覆部６２の非固定端部とその接続対象との間の間隙を支持部２３で覆うことができ、耐火性を向上することができる。 According to this aspect, the gap between the non-fixed end portion of the tubular covering portion 62 and the connection target thereof can be covered with the support portion 23, and the fire resistance can be improved.

第４の態様に係る横架材３の耐火構造１では、第１〜３のいずれかの態様において、筒状被覆部６２の外面と貫通孔（第一貫通孔２２又は第二貫通孔３３）の内周面との間に嵌め込まれ、固定端部をその接続対象に対して固定するくさび部材７１を更に備える。 In the fireproof structure 1 of the horizontal member 3 according to the fourth aspect, in any one of the first to third aspects, the outer surface of the tubular covering portion 62 and the through hole (first through hole 22 or second through hole 33). Further includes a wedge member 71 that is fitted between the inner peripheral surface of the surface and fixes the fixed end portion to the connection target.

この態様によれば、筒状被覆部６２の外径又は／及び貫通孔の内径等に製造誤差が生じても、容易に、筒状被覆部６２の固定端部をその接続対象に固定することができ、より施工性を向上することができる。 According to this aspect, even if a manufacturing error occurs in the outer diameter of the tubular covering portion 62 and / or the inner diameter of the through hole, the fixed end portion of the tubular covering portion 62 can be easily fixed to the connection target. It is possible to improve the workability.

第５の態様に係る横架材３の耐火構造１では、第１〜４のいずれか１つの態様において、筒状被覆部６２とその接続対象との間には、所定温度で加熱されると膨張する膨張部材８が設けられている。 In the fireproof structure 1 of the horizontal member 3 according to the fifth aspect, in any one of the first to fourth aspects, the cylindrical covering portion 62 and the connection target thereof are heated at a predetermined temperature. An expanding member 8 that expands is provided.

この態様によれば、火事等の際に、膨張部材８が火熱を受けると膨張するため、筒状被覆部６２とその接続対象との間から火熱が侵入するのを防ぐことができ、一層、耐火性を向上させることができる。 According to this aspect, in the event of a fire or the like, the expansion member 8 expands when it receives heat, so that it is possible to prevent the heat from entering between the cylindrical covering portion 62 and the connection target thereof, and further. Fire resistance can be improved.

１ 耐火構造
２ 外壁
２２ 第一貫通孔（貫通孔）
２３ 支持部
３ 横架材
３３ 第二貫通孔（貫通孔）
６ 耐火材
６１ 屋内面被覆部
６２ 筒状被覆部
７ 固定部
７１ くさび部材
８ 膨張部材 1 Fireproof structure 2 Outer wall 22 First through hole (through hole)
23 Support part 3 Horizontal lumber 33 Second through hole (through hole)
6 Refractory material 61 Indoor surface covering part 62 Cylindrical covering part 7 Fixed part 71 Wedge member 8 Expansion member

Claims (5)

貫通孔を有する外壁と、
前記貫通孔に対応する位置に形成された貫通孔を有し、前記外壁の屋内側の面に対向する横架材と、
前記横架材を被覆する耐火材と、
を備え、
前記耐火材は、
前記横架材の屋内側の面のうち前記貫通孔を除く部分を被覆する屋内面被覆部と、
前記外壁の貫通孔と前記横架材の貫通孔とを通じさせた状態で、前記屋内面被覆部と前記外壁とをつなぐ筒状被覆部と、
を有し、
前記筒状被覆部は、中心軸方向の一方の端部がその接続対象に対して固定された固定端部であり、中心軸方向の他方の端部がその接続対象に対して非固定である非固定端部である、
横架材の耐火構造。 An outer wall with a through hole and
A horizontal lumber having a through hole formed at a position corresponding to the through hole and facing the indoor side surface of the outer wall,
The refractory material that covers the horizontal material and
Equipped with
The refractory material is
An indoor surface covering portion that covers a portion of the indoor side surface of the horizontal lumber excluding the through hole, and an indoor surface covering portion.
With the through hole of the outer wall and the through hole of the horizontal member passed through, the tubular covering portion connecting the indoor surface covering portion and the outer wall, and the tubular covering portion.
Have,
One end of the tubular covering portion in the central axial direction is a fixed end portion fixed to the connection target, and the other end portion in the central axial direction is non-fixed to the connection target. Non-fixed end,
Fireproof structure of horizontal lumber. 前記非固定端部の接続対象は、前記貫通孔の周縁部の少なくとも一部に形成された支持部を有し、
前記非固定端部は、前記支持部によって、屋内外方向に移動可能に支持されている、
請求項１記載の横架材の耐火構造。 The connection target of the non-fixed end portion has a support portion formed in at least a part of the peripheral portion of the through hole.
The non-fixed end portion is movably supported indoors and outdoors by the support portion.
The fireproof structure of the horizontal lumber according to claim 1. 前記支持部は、前記貫通孔の周縁に沿って全周にわたって連続している、
請求項２に記載の横架材の耐火構造。 The support portion is continuous over the entire circumference along the peripheral edge of the through hole.
The fireproof structure of the horizontal lumber according to claim 2. 前記筒状被覆部の外面と前記貫通孔の内周面との間に嵌め込まれ、前記固定端部をその接続対象に対して固定するくさび部材を更に備える、
請求項１〜３のいずれか一項に記載の横架材の耐火構造。 A wedge member that is fitted between the outer surface of the tubular covering portion and the inner peripheral surface of the through hole and fixes the fixed end portion to the connection target is further provided.
The fireproof structure of the horizontal lumber according to any one of claims 1 to 3. 前記非固定端部と前記非固定端部の接続対象との間には、所定温度で加熱されると膨張する膨張部材が設けられている、
請求項１〜４のいずれか一項に記載の横架材の耐火構造。 An expansion member that expands when heated at a predetermined temperature is provided between the non-fixed end portion and the connection target of the non-fixed end portion.
The fireproof structure of the horizontal lumber according to any one of claims 1 to 4.
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