JP6713744B2 - Fireproof structure, construction method of fireproof structure - Google Patents
Fireproof structure, construction method of fireproof structure Download PDFInfo
- Publication number
- JP6713744B2 JP6713744B2 JP2015195882A JP2015195882A JP6713744B2 JP 6713744 B2 JP6713744 B2 JP 6713744B2 JP 2015195882 A JP2015195882 A JP 2015195882A JP 2015195882 A JP2015195882 A JP 2015195882A JP 6713744 B2 JP6713744 B2 JP 6713744B2
- Authority
- JP
- Japan
- Prior art keywords
- expandable sheet
- side plate
- heat
- hole
- steel box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Landscapes
- Building Environments (AREA)
Description
本発明は、防火構造、及び当該防火構造の施工方法に関する。 The present invention relates to a fireproof structure and a method for constructing the fireproof structure.
従来、建築物の壁材として、石膏ボードや珪酸カルシウム板等の耐火ボードが使用されており、耐火ボードに形成した貫通孔にコンセントやスイッチを設置することが行われている。 Conventionally, a fireproof board such as a gypsum board or a calcium silicate board has been used as a wall material of a building, and an outlet or a switch has been installed in a through hole formed in the fireproof board.
コンセントやスイッチの設置箇所では、火災の発生時に、コンセントやスイッチが溶融変形して、火災が、耐火ボードの貫通孔を通じて、耐火ボードの裏側に侵入する虞がある。そして、耐火ボードの裏側に火災が侵入すると、災がコンセントやスイッチに接続される電線を伝うことで、延焼が生じ得る。 In the place where the outlet or the switch is installed, when the fire occurs, the outlet or the switch may be melted and deformed, and the fire may enter the back side of the fireproof board through the through hole of the fireproof board. Then, when a fire enters the back side of the fireproof board, the disaster propagates through an electric wire connected to an outlet or a switch, so that the fire may spread.
そこで、コンセントやスイッチの裏側に鋼製ボックスを設けることが行われており、特許文献１には、熱膨張性シートを用いて鋼製ボックスに防火措置を講じることが提案されている。 Therefore, a steel box is provided on the back side of the outlet and the switch, and Patent Document 1 proposes to take a fire protection measure for the steel box by using a heat-expandable sheet.
特許文献１は、一対の強化石膏の耐火ボードを鋼製スタッドの両面に張り付けて構成される中空壁を、建築物の間仕切壁として使用するものである。一方の耐火ボードには鋼製ボックスを埋め込む開口部が形成され、鋼製ボックスの表側にコンセントやスイッチが取り付けられる。鋼製ボックスの背面板や側面板は、開口部から裏側（中空壁の内側）に延び出ており、この延び出た背面板や側面板の外面全体が熱膨張性シートで覆われる。熱膨張性シートの上には、石膏ボードやロックウール等の不燃材が積層される。 Patent Document 1 uses a hollow wall formed by sticking a pair of reinforced gypsum refractory boards to both sides of steel studs as a partition wall of a building. One of the refractory boards has an opening for embedding a steel box, and an outlet and a switch are attached to the front side of the steel box. The back plate and the side plate of the steel box extend from the opening to the back side (inside of the hollow wall), and the entire outer surfaces of the extended back plate and side plate are covered with the heat-expandable sheet. An incombustible material such as gypsum board or rock wool is laminated on the heat-expandable sheet.
近年、鋼製ボックスから延び出た電線管やケーブルを、中空壁の内側に通した後、反対側の耐火ボードに貫通させることが行われている。そして当該電線管やケーブルの貫通箇所における防火措置が適切に行われている場合には、上記反対側の耐火ボードと向かい合う鋼製ボックスの背面板に防火措置を施しても、防火性の向上に大きな効果が得られないことが公的機関の試験で確認されている。このため、中空壁の耐火ボードに対して鋼製ボックスを設置する場合には、防火性の向上を期待できる鋼製ボックスの部位に対して重点的に防火措置を施すことが費用対効果の面から好ましく、特許文献１の技術では、鋼製ボックスの背面板に熱膨張性シートを設置することが、防火措置の必要性に乏しい部位に、熱膨張性シートの設置手間や材料コストをかける無駄な措置となり得る。 In recent years, it has been practiced to pass an electric wire tube or cable extending from a steel box inside a hollow wall and then to a fireproof board on the opposite side. And if fire protection measures are properly taken at the places where the conduits and cables penetrate, even if fire protection measures are applied to the back plate of the steel box facing the fire protection board on the opposite side, the fire protection can be improved. It has been confirmed by a public institution test that a large effect cannot be obtained. For this reason, when installing a steel box on a fireproof board with a hollow wall, it is cost-effective to focus fire protection measures on the parts of the steel box that can be expected to improve fire protection. According to the technique of Patent Document 1, it is wasteful to install a heat-expandable sheet on the back plate of the steel box in a place where there is little need for fire prevention measures, which is a time-consuming installation work and a material cost. Can be a measure.
また近年では、ボード材料の多様化で片壁が多く採用されていることを背景に、耐火ボードへの鋼製ボックスの取り付け方法として、特許文献１に開示されるような埋め込み式ではなく、耐火ボードに形成した貫通孔の周囲に鋼製ボックスの側面板を沿わせて、鋼製ボックスを留め付けることが一般的に行われている。このように鋼製ボックスが設置される場合には、鋼製ボックスの側面板を耐火ボードに隙間なく密着させることが、防火性を向上させる上で効果的である。しかしながら、そのような施工が困難であることで、耐火ボードと鋼製ボックスとの間に隙間が生じたまま放置されている実態がある。この問題に関し、特許文献１で使用される石膏ボードやロックウールは、形状追随性に乏しいため、耐火ボードと鋼製ボックスの側面板との間の隙間を埋めることに適していない。また、石膏ボードやロックウールは、鋼製ボックスに取り付けるために煩雑な手間を要し、経年使用により鋼製ボックスから脱落する虞もある。 Further, in recent years, against the background that a single wall is often used due to the diversification of board materials, as a method of attaching a steel box to a fireproof board, it is not an embedded type as disclosed in Patent Document 1, but a fireproof method. A steel box is generally fastened by placing a side plate of the steel box around the through hole formed in the board. When the steel box is installed in this way, it is effective to closely attach the side plate of the steel box to the fireproof board in order to improve the fireproof property. However, due to the difficulty of such construction, there is a situation in which the refractory board and the steel box are left with a gap therebetween. Regarding this problem, the gypsum board and rock wool used in Patent Document 1 are not suitable for filling the gap between the fire-resistant board and the side plate of the steel box because they lack shape conformability. Further, plasterboard and rockwool require complicated labor to be attached to the steel box, and may fall off the steel box due to long-term use.
本発明は、上記事項に鑑みなされたものであり、その目的は、貫通孔が形成される建築物の壁材と、側面板が壁材の貫通孔の周囲に沿うように設置される鋼製ボックスとを備える防火構造であって、高い防火性能を安定して実現できるとともに、安価な材料コストで煩雑な手間を要せず施工できることで、費用対効果に優れた防火構造、及び当該防火構造の施工方法を提供することである。 The present invention is made in view of the above matters, and an object thereof is a wall material of a building in which a through hole is formed, and a side plate made of steel installed along the periphery of the through hole of the wall material. A fireproof structure with a box, which can achieve high fireproof performance in a stable manner and can be constructed at a low material cost without complicated labor, and a cost effective fireproof structure, and the fireproof structure. Is to provide a construction method.
本発明者らは、テープ状の熱膨張性シートを用いて、鋼製ボックスの側面板と壁材との間の隙間を塞ぐことで、上記の目的を達成できることを見出し、本発明を完成するに至った。 The present inventors have found that the above object can be achieved by closing the gap between the side plate of the steel box and the wall material by using the tape-shaped thermally expandable sheet, and complete the present invention. Came to.
すなわち、本発明の第１観点に係る防火構造は、貫通孔が形成される建築物の壁材と、背面板と、前記背面板の周縁から立設される側面板とから構成されて、前記背面板の反対面に開口を有し、当該開口を前記壁材の貫通孔に向けて、前記側面板の先端が前記壁材の貫通孔の周囲に沿うように設置される鋼製ボックスと、前記側面板と前記壁材の双方に接するように前記鋼製ボックスの周方向に延びるとともに、前記側面板と前記壁材とに接合することで、前記側面板と前記壁材との間の隙間を塞ぐテープ状の熱膨張性シートとを備え、前記背面板には、前記熱膨張性シートが接合されないことを特徴とする。 That is, the fire protection structure according to the first aspect of the present invention is configured by a wall material of a building in which a through hole is formed, a back plate, and a side plate erected from a peripheral edge of the back plate, A steel box having an opening on the opposite surface of the back plate, with the opening facing the through hole of the wall material, and the tip of the side plate being installed along the periphery of the through hole of the wall material, By extending in the circumferential direction of the steel box so as to be in contact with both the side plate and the wall material, and by joining the side plate and the wall material, a gap between the side plate and the wall material. And a tape-shaped heat-expandable sheet that closes the sheet, and the heat-expandable sheet is not joined to the back plate.
好ましくは、前記熱膨張性シートは、熱膨張性黒鉛或いはブチルゴムから形成されて、その自己粘着性により、前記側面板と前記壁材とに接合する。 Preferably, the heat-expandable sheet is formed of heat-expandable graphite or butyl rubber, and is bonded to the side plate and the wall material by its self-adhesiveness.
好ましくは、前記熱膨張性シートは、前記側面板の外面と前記壁材の壁面とに接合することで、前記鋼製ボックスの外側から前記側面板と前記壁材との間の隙間を塞ぐ。 Preferably, the thermally expandable sheet closes a gap between the side plate and the wall member from the outside of the steel box by joining the outer surface of the side plate and the wall surface of the wall member.
好ましくは、前記熱膨張性シートは、前記側面板の内面と前記貫通孔の孔面とに接合することで、前記鋼製ボックスの内側から前記側面板と前記壁材との間の隙間を塞ぐ。 Preferably, the thermally expandable sheet closes a gap between the side plate and the wall member from the inside of the steel box by joining the inner surface of the side plate and the hole surface of the through hole. ..
本発明の第２観点に係る施工方法は、前記防火構造の施工方法であって、前記側面板の先端が前記壁材の壁面に沿うように、前記鋼製ボックスを設置する工程と、前記熱膨張性シートの幅一方側が前記側面板の外面に当接し、前記熱膨張性シートの幅他方側が前記壁材の壁面に当接するように、前記熱膨張性シートを鋼製ボックスの周方向に延ばして、前記熱膨張性シートの幅一方側及び幅他方側を、それぞれ前記側面板の外面及び前記壁材の壁面に接合する工程と、前記鋼製ボックスの開口と重なるように、前記壁材に前記貫通孔を形成する工程とを有する。 A construction method according to a second aspect of the present invention is a construction method of the fireproof structure, wherein the steel box is installed so that a tip of the side plate is along a wall surface of the wall material, and the heat treatment. One side of the width of the expandable sheet is in contact with the outer surface of the side plate, the other side of the width of the thermally expandable sheet is in contact with the wall surface of the wall material, the thermally expandable sheet is extended in the circumferential direction of the steel box. A step of joining the one side and the other side of the width of the heat-expandable sheet to the outer surface of the side plate and the wall surface of the wall material, respectively, so that the wall material overlaps the opening of the steel box. And a step of forming the through hole.
本発明の第３観点に係る施工方法は、前記防火構造の施工方法であって、前記熱膨張性シートの幅一方側が前記側面板の外面に当接するように、前記熱膨張性シートを前記鋼製ボックスの周方向に延ばして、前記熱膨張性シートの幅一方側を前記側面板の外面に接合する工程と、前記側面板の先端が前記壁材の壁面に沿うように前記鋼製ボックスを設置するとともに、前記側面板の先端から延び出た前記熱膨張性シートの幅他方側を、前記壁材の壁面に沿うように屈曲させて、前記壁材の壁面に接合する工程と、前記鋼製ボックスの開口と重なるように、前記貫通孔を前記壁材に形成する工程とを有する。 A construction method according to a third aspect of the present invention is a construction method for the fireproof structure, wherein the thermally expandable sheet is made of the steel so that one widthwise side of the thermally expandable sheet abuts an outer surface of the side plate. Extending in the circumferential direction of the box made, the step of joining the width one side of the thermally expandable sheet to the outer surface of the side plate, and the steel box so that the tip of the side plate is along the wall surface of the wall material. Installed, bending the other width side of the heat-expandable sheet extending from the tip of the side plate along the wall surface of the wall material, and joining to the wall surface of the wall material; Forming the through hole in the wall material so as to overlap with the opening of the box.
本発明の第４観点に係る施工方法は、前記防火構造の施工方法であって、前記側面板の先端が前記壁材の壁面に沿うように、前記鋼製ボックスを設置する工程と、前記鋼製ボックスの開口と重なるように、前記貫通孔を前記壁材に形成する工程と、前記熱膨張性シートの幅一方側が前記側面板の内面に当接し、前記熱膨張性シートの幅他方側が前記貫通穴の孔面に当接するように、前記熱膨張性シートを前記鋼製ボックスの周方向に延ばして、前記熱膨張性シートの幅一方側を前記側面板の内面に接合し、前記熱膨張性シートの幅他方側を前記貫通孔の孔面に接合する工程とを有する。 A construction method according to a fourth aspect of the present invention is a construction method for the fireproof structure, wherein the steel box is installed so that a tip of the side plate is along a wall surface of the wall material, and the steel. The step of forming the through hole in the wall material so as to overlap with the opening of the box, the one side of the width of the heat-expandable sheet is in contact with the inner surface of the side plate, and the other side of the width of the heat-expandable sheet is The heat-expandable sheet is extended in the circumferential direction of the steel box so as to come into contact with the hole surface of the through hole, and one width side of the heat-expandable sheet is joined to the inner surface of the side plate, and the heat expansion is performed. Bonding the other width side of the elastic sheet to the hole surface of the through hole.
本発明の第４観点に係る施工方法は、前記防火構造の施工方法であって、前記熱膨張性シートの幅一方側が前記側面板の内面に当接するように、前記熱膨張性シートを前記鋼製ボックスの周方向に延ばして、前記熱膨張性シートの幅一方側を前記側面板の内面に接合する工程と、前記側面板の先端が壁材の壁面に沿うように鋼製ボックスを設置する工程と、前記鋼製ボックスの開口と重なるように、前記貫通孔を前記壁材に形成する工程と、前記側面板の先端から延び出た前記熱膨張性シートの幅他方側を、前記貫通孔の孔面に沿うように延ばして、前記貫通孔の孔面に接合する工程とを有する。 A construction method according to a fourth aspect of the present invention is the construction method for the fireproof structure, wherein the heat-expandable sheet is made of the steel so that one side of the width of the heat-expandable sheet abuts an inner surface of the side plate. Extending in the circumferential direction of the box made of steel, the step of joining one side of the width of the thermally expandable sheet to the inner surface of the side plate, and installing the steel box so that the tip of the side plate is along the wall surface of the wall material. Step, forming the through hole in the wall material so as to overlap with the opening of the steel box, and the other side of the width of the thermally expandable sheet extending from the tip of the side plate, the through hole And a step of joining to the hole surface of the through hole.
本発明によれば、熱膨張性シートがテープ状を呈することで、熱膨張性シートは高い形状追随性を有する。このため、鋼製ボックスと壁材との間の隙間を熱膨張性シートで隙間なく完全に埋めることができる。これにより、火災の発生時には、火災の熱で膨張する熱膨張性シートによって、鋼製ボックスと壁材との間から火災の熱が壁材の裏側に侵入することを確実に阻止できる。また鋼製ボックスの背面板には熱膨張性シートが設けられないので、熱膨張性シートの材料コストや、熱膨張性シートを接合する手間を小さく抑えることができる。以上のことから、本発明の防火構造は、高い防火性能を実現できるとともに、安価な材料コストで煩雑な手間を要せず施工できるので、費用対効果に優れる。 According to the present invention, since the heat-expandable sheet has a tape shape, the heat-expandable sheet has high conformability. Therefore, the gap between the steel box and the wall material can be completely filled with the thermally expandable sheet. Accordingly, when a fire occurs, the heat-expandable sheet that expands with the heat of the fire can reliably prevent the heat of the fire from entering between the steel box and the wall material into the back side of the wall material. Further, since the heat-expandable sheet is not provided on the back plate of the steel box, the material cost of the heat-expandable sheet and the labor for joining the heat-expandable sheets can be reduced. From the above, the fireproof structure of the present invention can realize high fireproof performance and can be constructed at a low material cost without complicated labor, so that it is excellent in cost effectiveness.
＜第１実施形態＞
以下、図面を参照しながら本発明の実施形態について説明する。図１は、第１実施形態に係る防火構造１を示す斜視図である。図２は、第１実施形態に係る防火構造１を示す垂直断面図であり、図３は、第１実施形態に係る防火構造１を示す水平断面図である。
<First Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a fire protection structure 1 according to the first embodiment. FIG. 2 is a vertical sectional view showing the fireproof structure 1 according to the first embodiment, and FIG. 3 is a horizontal sectional view showing the fireproof structure 1 according to the first embodiment.
第１実施形態に係る防火構造１は、壁材２と、鋼製ボックス３と、テープ状の熱膨張性シート４とを備える。壁材２は、壁材５とともに、中空壁６を構成するものである。壁材２，５は、強化石膏ボードや珪酸カルシウム板を２枚重ね合わせた耐火ボードであり、上下方向に延びる。壁材２及び壁材５は、支柱としての軽量鉄骨７（図３）の一方面及び他方面に張り付けられており、壁材２と壁材５との間には、軽量鉄骨７の幅ほどの間隔があいている。壁材２には、コンセント８やスイッチを設置するための貫通孔２０が形成される。 The fireproof structure 1 according to the first embodiment includes a wall material 2, a steel box 3, and a tape-shaped thermally expandable sheet 4. The wall material 2 constitutes the hollow wall 6 together with the wall material 5. The wall materials 2 and 5 are fireproof boards in which two reinforced gypsum boards or calcium silicate boards are stacked and extend in the vertical direction. The wall material 2 and the wall material 5 are attached to one surface and the other surface of the lightweight steel frame 7 (FIG. 3) as a support, and the width between the wall material 2 and the wall material 5 is about the width of the lightweight steel frame 7. Are spaced. The wall material 2 is formed with a through hole 20 for installing the outlet 8 and the switch.
鋼製ボックス３は、コンセントボックス、アウトレットボックス、スイッチボックス、或いはボタンボックスと称されるものであり、中空壁６の内部（壁材２と壁材５との間）に設置される。鋼製ボックス３は、一面が開口する箱状を呈する。具体的には図４に示すように、鋼製ボックス３は、略正方形状の背面板９と、背面板９の周縁から立設される４つの側面板１０とを備えるものであり、これら側面板１０の内側に凹部１１が形成される。凹部１１は、電線２３等を収容する空間として使用されるものであり、背面板９の反対面に凹部１１の開口がある。背面板９には、ボルト挿通用の孔１２が形成される。上下の側面板１０，１０の先端には、一対の突出部１０ｂ，１０ｂが形成される。突出部１０ｂ，１０ｂは、上下の側面板１０，１０に略垂直かつ凹部１１の内方に向かって延びる。突出部１０ｂ，１０ｂの各々には、螺子挿通用の孔１３が形成される。上側の側面板１０には、円形の開口部１０ｃ（ノックアウト）が形成される。 The steel box 3 is called an outlet box, an outlet box, a switch box, or a button box, and is installed inside the hollow wall 6 (between the wall material 2 and the wall material 5). The steel box 3 has a box shape with one surface open. Specifically, as shown in FIG. 4, the steel box 3 is provided with a substantially square back plate 9 and four side plates 10 standing from the peripheral edge of the back plate 9, and these side plates 10 A recess 11 is formed inside the face plate 10. The recess 11 is used as a space for accommodating the electric wires 23 and the like, and has an opening of the recess 11 on the opposite surface of the back plate 9. A hole 12 for inserting a bolt is formed in the back plate 9. A pair of protrusions 10b, 10b are formed at the tips of the upper and lower side plates 10, 10. The protrusions 10 b, 10 b extend substantially perpendicular to the upper and lower side plates 10, 10 and toward the inside of the recess 11. A hole 13 for screw insertion is formed in each of the protrusions 10b and 10b. A circular opening 10c (knockout) is formed in the upper side plate 10.
以上の鋼製ボックス３は、図２や図３に示すように、凹部１１の開口を壁材２に向けて、側面板１０の先端が壁材２の貫通孔２０の周囲に沿うように設置される。図３に示すように、軽量鉄骨７には、鋼製ボックス３に向けて延びる支持金具２１が取り付けられており、鋼製ボックス３は、孔１２（図４）に挿通されるボルトと、このボルトに締結されるナットとよって、支持金具２１に固定される。また、鋼製ボックス３は、孔１３（図４）に挿通される螺子により、壁材２に固定される。開口部１０ｃ（図４）にはコネクタ２２（図２）が接続され、このコネクタ２２を介して凹部１１内に引き込まれた電線２３が、コンセント８やスイッチ（以下、コンセント８等）に接続される。 As shown in FIGS. 2 and 3, the above steel box 3 is installed so that the opening of the recess 11 faces the wall material 2 and the tip of the side plate 10 is along the periphery of the through hole 20 of the wall material 2. To be done. As shown in FIG. 3, a support metal fitting 21 extending toward the steel box 3 is attached to the lightweight steel frame 7, and the steel box 3 includes a bolt inserted into the hole 12 (FIG. 4) and It is fixed to the support fitting 21 by a nut fastened to the bolt. Further, the steel box 3 is fixed to the wall member 2 with a screw inserted into the hole 13 (FIG. 4). A connector 22 (FIG. 2) is connected to the opening 10c (FIG. 4), and an electric wire 23 drawn into the recess 11 via the connector 22 is connected to an outlet 8 or a switch (hereinafter, outlet 8 etc.). It
図２や図３に示すように、熱膨張性シート４は、側面板１０の外面１０ａと壁材２の裏側の壁面２ａとの双方に接するように、鋼製ボックス３の周方向に延びる。熱膨張性シート４は、側面板１０の外面１０ａと壁材２の壁面２ａとに接合しており、鋼製ボックス３の外側から側面板１０と壁材２との間の隙間を塞ぐ。 As shown in FIGS. 2 and 3, the thermally expandable sheet 4 extends in the circumferential direction of the steel box 3 so as to contact both the outer surface 10a of the side plate 10 and the wall surface 2a on the back side of the wall member 2. The heat-expandable sheet 4 is joined to the outer surface 10a of the side plate 10 and the wall surface 2a of the wall member 2, and closes the gap between the side plate 10 and the wall member 2 from the outside of the steel box 3.
上述の熱膨張性シート４は、耐火性を有する熱膨張材から形成されたものである。この熱膨張材として、バインダー又はマトリックスとしての熱可塑性樹脂、ゴム物質、又は熱硬化性樹脂などの合成樹脂、熱膨張性黒鉛、及び無機充填材を含む、熱膨張性樹脂組成物が挙げられる。 The above-mentioned thermal expansion sheet 4 is formed of a thermal expansion material having fire resistance. Examples of the thermal expansion material include a thermal expansion resin composition containing a thermoplastic resin as a binder or a matrix, a rubber substance, or a synthetic resin such as a thermosetting resin, thermal expansion graphite, and an inorganic filler.
熱可塑性樹脂としては、例えば、ポリプロピレン系樹脂、ポリエチレン系樹脂、ポリブテン系樹脂、ポリペンテン系樹脂等のポリオレフィン系樹脂、ポリスチレン系樹脂、アクリロニトリル−ブタジエン−スチレン系樹脂、ポリカーボネート系樹脂、ポリフェニレンエーテル系樹脂、アクリル系樹脂、ポリアミド系樹脂、ポリ塩化ビニル系樹脂等が挙げられる。 As the thermoplastic resin, for example, polypropylene resin, polyethylene resin, polybutene resin, polyolefin resin such as polypentene resin, polystyrene resin, acrylonitrile-butadiene-styrene resin, polycarbonate resin, polyphenylene ether resin, Examples thereof include acrylic resins, polyamide resins, polyvinyl chloride resins and the like.
ゴム物質としては、例えば、天然ゴム（ＮＲ）、イソプレンゴム（ＩＲ）、ブタジエンゴム（ＢＲ）、１，２−ポリブタジエンゴム（１，２−ＢＲ）、スチレン−ブタジエンゴム（ＳＢＲ）、クロロプレンゴム（ＣＲ）、ニトリルゴム（ＮＢＲ）、ブチルゴム（ＩＩＲ）、エチレン−プロピレンゴム（ＥＰＲ、ＥＰＤＭ）、クロロスルホン化ポリエチレン（ＣＳＭ）、アクリルゴム（ＡＣＭ、ＡＮＭ）、エピクロルヒドリンゴム（ＣＯ、ＥＣＯ）、多加硫ゴム（Ｔ）、シリコーンゴム（Ｑ）、フッ素ゴム（ＦＫＭ、ＦＺ）、ウレタンゴム（Ｕ）等が挙げられる。 Examples of the rubber substance include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene rubber (SBR), chloroprene rubber ( CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), multiple vulcanization Examples thereof include rubber (T), silicone rubber (Q), fluororubber (FKM, FZ), urethane rubber (U) and the like.
熱硬化性樹脂としては、例えば、ポリウレタン、ポリイソシアネート、ポリイソシアヌレート、フェノール樹脂、エポキシ樹脂、尿素樹脂、メラミン樹脂、不飽和ポリエステル樹脂、ポリイミド等が挙げられる。 Examples of the thermosetting resin include polyurethane, polyisocyanate, polyisocyanurate, phenol resin, epoxy resin, urea resin, melamine resin, unsaturated polyester resin, and polyimide.
これらの樹脂は、単独で用いても、２種以上を併用してもよい。これらの樹脂のうち、後述する熱膨張性黒鉛を配合する場合に、その膨張温度以下で成形可能であるという観点から、ポリオレフィン系樹脂またはゴム物質が好ましく、中でもポリエチレン系樹脂が好ましい。また、防火性能をより向上させるために、充填剤を多量に配合することが可能であるという観点からは、ゴム物質が好ましい。さらに、樹脂自体の難燃性を上げて防火性能を向上させるという観点からは、フェノール樹脂、エポキシ樹脂が好ましい。特に分子構造の選択が広範囲で、樹脂組成物の防火性能や力学物性を調整することが容易であることから、エポキシ樹脂が好ましい。 These resins may be used alone or in combination of two or more. Among these resins, a polyolefin-based resin or a rubber substance is preferable, and a polyethylene-based resin is particularly preferable, from the viewpoint of being moldable at a temperature not higher than the expansion temperature when the later-described thermally expandable graphite is mixed. In addition, a rubber substance is preferable from the viewpoint that a large amount of a filler can be blended in order to further improve the fire protection performance. Further, from the viewpoint of increasing the flame retardancy of the resin itself and improving the fireproof performance, a phenol resin and an epoxy resin are preferable. In particular, an epoxy resin is preferable because the selection of the molecular structure is wide and it is easy to adjust the fireproof performance and mechanical properties of the resin composition.
熱膨張性黒鉛は、従来公知の物質であり、天然鱗状グラファイト、熱分解グラファイト、キッシュグラファイト等の粉末を濃硫酸、硝酸、セレン酸等の無機酸と、濃硝酸、過塩素酸、過塩素酸塩、過マンガン酸塩、重クロム酸塩、過酸化水素等の強酸化剤とで処理してグラファイト層間化合物を生成させたもので、炭素の層状構造を維持したままの結晶化合物である。このように酸処理して得られた熱膨張性黒鉛は、さらにアンモニア、脂肪族低級アミン、アルカリ金属化合物、アルカリ土類金属化合物等で中和したものを使用するのが好ましい。 Thermally expandable graphite is a conventionally known substance, and powders of natural scaly graphite, pyrolytic graphite, Kish graphite and the like are mixed with inorganic acids such as concentrated sulfuric acid, nitric acid and selenic acid, and concentrated nitric acid, perchloric acid, perchloric acid. A crystalline intercalation compound is produced by treating with a strong oxidant such as salt, permanganate, dichromate or hydrogen peroxide to produce a graphite intercalation compound, which is a crystalline compound while maintaining the carbon layered structure. The heat-expandable graphite thus obtained by the acid treatment is preferably neutralized with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound or the like.
熱膨張性黒鉛の粒度は、２０〜２００メッシュが好ましい。粒度が２００メッシュより小さくなると、黒鉛の膨張度が小さく、十分な膨張断熱層が得られず、また粒度が２０メッシュより大きくなると、黒鉛の膨張度が大きいという利点はあるが、樹脂に配合する際に分散性が悪くなり、物性の低下が避けられない。熱膨張性黒鉛の市販品としては、例えば、東ソー社製「ＧＲＥＰ−ＥＧ」、ＧＲＡＦＴＥＣＨ社製「ＧＲＡＦＧＵＡＲＤ」等が挙げられる。 The particle size of the thermally expandable graphite is preferably 20 to 200 mesh. If the particle size is smaller than 200 mesh, the degree of expansion of graphite is small and a sufficient expanded heat insulating layer cannot be obtained, and if the particle size is larger than 20 mesh, the degree of expansion of graphite is large, but it is compounded with resin. At that time, the dispersibility deteriorates and the physical properties are unavoidably deteriorated. Examples of commercially available products of thermally expandable graphite include "GREP-EG" manufactured by Tosoh Corporation, "GRAFGUARD" manufactured by GRAFTECH, and the like.
熱膨張性樹脂組成物には、さらに無機充填剤を配合することが好ましい。 It is preferable to further add an inorganic filler to the heat-expandable resin composition.
無機充填剤は、膨張断熱層が形成される際、熱容量を増大させ伝熱を抑制するとともに、骨材的に働いて膨張断熱層の強度を向上させる。無機充填剤としては特に限定されず、例えば、アルミナ、酸化亜鉛、酸化チタン、酸化カルシウム、酸化マグネシウム、酸化鉄、酸化錫、酸化アンチモン、フェライト類等の金属酸化物；水酸化カルシウム、水酸化マグネシウム、水酸化アルミニウム、ハイドロタルサイト等の含水無機物；塩基性炭酸マグネシウム、炭酸カルシウム、炭酸マグネシウム、炭酸亜鉛、炭酸ストロンチウム、炭酸バリウム等の金属炭酸塩等が挙げられる。 When the expansion heat insulating layer is formed, the inorganic filler suppresses heat transfer by increasing the heat capacity, and acts as an aggregate to improve the strength of the expansion heat insulating layer. The inorganic filler is not particularly limited, and examples thereof include metal oxides such as alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, and ferrites; calcium hydroxide, magnesium hydroxide. Hydrous inorganics such as aluminum hydroxide and hydrotalcite; metal carbonates such as basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, and barium carbonate.
また、無機充填剤としては、これらの他に、硫酸カルシウム、石膏繊維、ケイ酸カルシウム等のカルシウム塩；シリカ、珪藻土、ドーソナイト、硫酸バリウム、タルク、クレー、マイカ、モンモリロナイト、ベントナイト、活性白土、セピオライト、イモゴライト、セリサイト、ガラス繊維、ガラスビーズ、シリカ系バルン、窒化アルミニウム、窒化ホウ素、窒化ケイ素、カーボンブラック、グラファイト、炭素繊維、炭素バルン、木炭粉末、各種金属粉、チタン酸カリウム、硫酸マグネシウム「ＭＯＳ」（商品名）、チタン酸ジルコン酸鉛、アルミニウムボレート、硫化モリブデン、炭化ケイ素、ステンレス繊維、ホウ酸亜鉛、各種磁性粉、スラグ繊維、フライアッシュ、脱水汚泥等が挙げられる。これらの無機充填剤は単独で用いても、２種以上を併用してもよい。 In addition to these, as inorganic fillers, calcium salts such as calcium sulfate, gypsum fiber, calcium silicate; silica, diatomaceous earth, dawsonite, barium sulfate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite. , Imogolite, sericite, glass fiber, glass beads, silica balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metal powders, potassium titanate, magnesium sulfate " MOS” (trade name), lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dehydrated sludge and the like. These inorganic fillers may be used alone or in combination of two or more.
無機充填剤の粒径としては、０．５〜１００μｍが好ましく、より好ましくは１〜５０μｍである。無機充填剤は、添加量が少ないときは、分散性が性能を大きく左右するため、粒径の小さいものが好ましいが、０．５μｍ未満になると二次凝集が起こり、分散性が悪くなる。添加量が多いときは、高充填が進むにつれて、樹脂組成物の粘度が高くなり成形性が低下するが、粒径を大きくすることで樹脂組成物の粘度を低下させることができる点から、粒径の大きいものが好ましい。粒径が１００μｍを超えると、成形体の表面性、樹脂組成物の力学的物性が低下する。 The particle size of the inorganic filler is preferably 0.5 to 100 μm, more preferably 1 to 50 μm. When the added amount of the inorganic filler is small, the dispersibility largely affects the performance, and therefore, it is preferable that the particle size is small, but if it is less than 0.5 μm, secondary aggregation occurs and the dispersibility deteriorates. When the amount of addition is large, the viscosity of the resin composition increases and the moldability decreases as the filling increases, but since the viscosity of the resin composition can be decreased by increasing the particle size, A large diameter is preferable. If the particle size exceeds 100 μm, the surface properties of the molded product and the mechanical properties of the resin composition deteriorate.
無機充填剤としては、例えば、水酸化アルミニウムでは、粒径１８μｍの「ハイジライトＨ−３１」（昭和電工社製）、粒径２５μｍの「Ｂ３２５」（ＡＬＣＯＡ社製）、炭酸カルシウムでは、粒径１．８μｍの「ホワイトンＳＢ赤」（備北粉化工業社製）、粒径８μｍの「ＢＦ３００」（備北粉化工業社製）等が挙げられる。 Examples of the inorganic filler include, for example, aluminum hydroxide having a particle size of 18 μm, “Hijilite H-31” (manufactured by Showa Denko KK), particle size of 25 μm, “B325” (manufactured by ALCOA), and calcium carbonate having a particle size of Examples include 1.8 μm “Whiten SB Red” (manufactured by Bihoku Flour Mills Co., Ltd.) and “BF300” (particles manufactured by Bihoku Flour Mills Ltd.) with particle size of 8 μm.
熱膨張性樹脂組成物では、膨張断熱層の強度を増加させ防火性能を向上させるために、前記の各成分に加えて、さらにリン化合物を添加してもよい。リン化合物としては、特に限定されず、例えば、赤リン；トリフェニルホスフェート、トリクレジルホスフェート、トリキシレニルホスフェート、クレジルジフェニルホスフェート、キシレニルジフェニルホスフェート等の各種リン酸エステル；リン酸ナトリウム、リン酸カリウム、リン酸マグネシウム等のリン酸金属塩；ポリリン酸アンモニウム類；下記化学式（１）で表される化合物等が挙げられる。これらのうち、防火性能の観点から、赤リン、ポリリン酸アンモニウム類、及び、下記化学式（１）で表される化合物が好ましく、性能、安全性、コスト等の点においてポリリン酸アンモニウム類がより好ましい。 In the heat-expandable resin composition, in order to increase the strength of the expansion heat-insulating layer and improve the fireproof performance, a phosphorus compound may be added in addition to the above components. The phosphorus compound is not particularly limited, and examples thereof include red phosphorus; various phosphoric acid esters such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate; sodium phosphate; Examples thereof include metal phosphates such as potassium phosphate and magnesium phosphate; ammonium polyphosphates; compounds represented by the following chemical formula (1), and the like. Among these, red phosphorus, ammonium polyphosphates, and compounds represented by the following chemical formula (1) are preferable from the viewpoint of fireproof performance, and ammonium polyphosphates are more preferable in terms of performance, safety, cost and the like. ..
化学式（１）中、Ｒ１及びＲ３は、水素、炭素数１〜１６の直鎖状あるいは分岐状のアルキル基、または、炭素数６〜１６のアリール基を表す。Ｒ２は、水酸基、炭素数１〜１６の直鎖状あるいは分岐状のアルキル基、炭素数１〜１６の直鎖状あるいは分岐状のアルコキシル基、炭素数６〜１６のアリール基、または、炭素数６〜１６のアリールオキシ基を表す。 In chemical formula (1), R1 and R3 represent hydrogen, a linear or branched alkyl group having 1 to 16 carbon atoms, or an aryl group having 6 to 16 carbon atoms. R2 is a hydroxyl group, a linear or branched alkyl group having 1 to 16 carbon atoms, a linear or branched alkoxyl group having 1 to 16 carbon atoms, an aryl group having 6 to 16 carbon atoms, or a carbon number It represents an aryloxy group of 6 to 16.
赤リンとしては、市販の赤リンを用いることができるが、耐湿性、混練時に自然発火しない等の安全性の点から、赤リン粒子の表面を樹脂でコーティングしたもの等が好適に用いられる。ポリリン酸アンモニウム類としては特に限定されず、例えば、ポリリン酸アンモニウム、メラミン変性ポリリン酸アンモニウム等が挙げられるが、取り扱い性等の点からポリリン酸アンモニウムが好適に用いられる。市販品としては、例えば、クラリアント社製「ＡＰ４２２」、「ＡＰ４６２」、Ｂｕｄｅｎｈｅｉｍ Ｉｂｅｒｉｃａ社製「ＦＲ ＣＲＯＳ ４８４」、「ＦＲ ＣＲＯＳ ４８７」等が挙げられる。 As the red phosphorus, commercially available red phosphorus can be used, but from the viewpoints of moisture resistance and safety such as not spontaneously igniting during kneading, those obtained by coating the surface of red phosphorus particles with a resin are preferably used. The ammonium polyphosphates are not particularly limited, and examples thereof include ammonium polyphosphate, melamine-modified ammonium polyphosphate, and the like, and ammonium polyphosphate is preferably used from the viewpoint of handleability and the like. Examples of commercially available products include “AP422” and “AP462” manufactured by Clariant, and “FR CROS 484” and “FR CROS 487” manufactured by Budenheim Iberica.
化学式（１）で表される化合物としては特に限定されず、例えば、メチルホスホン酸、メチルホスホン酸ジメチル、メチルホスホン酸ジエチル、エチルホスホン酸、プロピルホスホン酸、ブチルホスホン酸、２−メチルプロピルホスホン酸、ｔ−ブチルホスホン酸、２，３−ジメチル−ブチルホスホン酸、オクチルホスホン酸、フェニルホスホン酸、ジオクチルフェニルホスホネート、ジメチルホスフィン酸、メチルエチルホスフィン酸、メチルプロピルホスフィン酸、ジエチルホスフィン酸、ジオクチルホスフィン酸、フェニルホスフィン酸、ジエチルフェニルホスフィン酸、ジフェニルホスフィン酸、ビス（４−メトキシフェニル）ホスフィン酸等が挙げられる。中でも、ｔ−ブチルホスホン酸は、高価ではあるが、高難燃性の点において好ましい。前記のリン化合物は、単独で用いても、２種以上を併用してもよい。 The compound represented by the chemical formula (1) is not particularly limited, and examples thereof include methylphosphonic acid, dimethyl methylphosphonate, diethyl methylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methylpropylphosphonic acid and t-. Butylphosphonic acid, 2,3-dimethyl-butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphinic acid, dioctylphosphinic acid, phenylphosphine Acid, diethylphenylphosphinic acid, diphenylphosphinic acid, bis(4-methoxyphenyl)phosphinic acid and the like can be mentioned. Among them, t-butylphosphonic acid is preferable in view of high flame retardancy, though it is expensive. The above phosphorus compounds may be used alone or in combination of two or more kinds.
また、樹脂組成物には、その物性を損なわない範囲で、さらにフェノール系、アミン系、イオウ系等の酸化防止剤、金属害防止剤、帯電防止剤、安定剤、架橋剤、滑剤、軟化剤、顔料等が添加されてもよい。また、一般的な難燃剤を添加してもよく、難燃剤による燃焼抑制効果により防火性能を向上させることができる。 Further, in the resin composition, as long as the physical properties thereof are not impaired, a phenol-based, amine-based, sulfur-based, etc. antioxidant, a metal damage inhibitor, an antistatic agent, a stabilizer, a crosslinking agent, a lubricant, and a softener. , Pigments, etc. may be added. In addition, a general flame retardant may be added, and the fire suppression performance can be improved by the combustion suppressing effect of the flame retardant.
樹脂組成物において、無機充填剤の配合量は、樹脂成分１００重量部に対して１０〜４００重量部が好ましい。配合量が１０重量部以上であると、十分な防火性能が得られ、４００重量部以下であると機械的強度が維持される。無機充填剤の配合量は、より好ましくは４０〜３５０重量部である。 In the resin composition, the compounding amount of the inorganic filler is preferably 10 to 400 parts by weight with respect to 100 parts by weight of the resin component. When the amount is 10 parts by weight or more, sufficient fireproof performance is obtained, and when the amount is 400 parts by weight or less, mechanical strength is maintained. The content of the inorganic filler is more preferably 40 to 350 parts by weight.
樹脂組成物において、リン化合物を添加する場合、リン化合物の配合量は、樹脂成分１００重量部に対して３０〜３００重量部である。配合量が３０重量部以上であると、膨張断熱層の強度を向上させる効果が十分であり、３００重量部以下であると、機械的強度が維持される。リン化合物の配合量は、より好ましくは４０〜２５０重量部である。 When the phosphorus compound is added to the resin composition, the compounding amount of the phosphorus compound is 30 to 300 parts by weight with respect to 100 parts by weight of the resin component. When the amount is 30 parts by weight or more, the effect of improving the strength of the expansion heat insulating layer is sufficient, and when it is 300 parts by weight or less, the mechanical strength is maintained. The compounding amount of the phosphorus compound is more preferably 40 to 250 parts by weight.
また、熱膨張性シート４を形成するために使用可能な市販の熱膨張性の耐火性シートとしては、例えば積水化学工業社製フィブロック（登録商標。エポキシ樹脂またはブチルゴムを樹脂成分とし、リン化合物、熱膨張性黒鉛および無機充填材等を含む熱膨張性樹脂組成物のシート状成形物）、住友スリーエム社のファイアバリア（クロロプレンゴムとバーミキュライトを含有する樹脂組成物からなるシート材料、膨張率：３倍、熱伝導率：０．２０ｋｃａｌ／ｍ・ｈ・℃）、三井金属塗料化学社のメジヒカット（ポリウレタン樹脂と熱膨張性黒鉛を含有する樹脂組成物からなるシート材料、膨張率：４倍、熱伝導率：０．２１ｋｃａｌ／ｍ・ｈ・℃）などが挙げられる。 Examples of commercially available heat-expandable fire-resistant sheets that can be used to form the heat-expandable sheet 4 include, for example, Sekisui Chemical Co., Ltd. Fiblock (registered trademark. Epoxy resin or butyl rubber as a resin component and a phosphorus compound. , A sheet-shaped molded product of a heat-expandable resin composition containing heat-expandable graphite and an inorganic filler, etc., a sheet material made of a Sumitomo 3M fire barrier (resin composition containing chloroprene rubber and vermiculite, expansion coefficient: 3 times, thermal conductivity: 0.20 kcal/m·h·° C.), sheet material made of a resin composition containing Mitsui Kinzoku Kagaku Kagaku Co., Ltd. (polyurethane resin and thermally expandable graphite, coefficient of expansion: 4 times, Thermal conductivity: 0.21 kcal/m·h·° C.) and the like.
なお、熱膨張性シート４を側面板１０や壁材２に接合する作業を容易とするために、熱膨張性シート４は、自己粘着性を有する熱膨張性黒鉛或いはブチルゴム等から形成されることが好ましい。また本発明では、自己粘着性のない熱膨張性シート４を使用することもでき、この場合、側面板１０の外面１０ａや壁材２の壁面２ａに塗布した粘着層に熱膨張性シート４を重ね合わせることや、接着剤を用いることで、熱膨張性シート４が側面板１０や壁材２に接合される。 In order to facilitate the work of joining the heat-expandable sheet 4 to the side panel 10 and the wall material 2, the heat-expandable sheet 4 is formed of self-adhesive heat-expandable graphite or butyl rubber. Is preferred. Further, in the present invention, the heat-expandable sheet 4 having no self-adhesiveness can be used. In this case, the heat-expandable sheet 4 is applied to the adhesive layer applied to the outer surface 10a of the side plate 10 or the wall surface 2a of the wall member 2. The heat-expandable sheet 4 is joined to the side plate 10 and the wall material 2 by stacking and using an adhesive.
次に、第１実施形態に係る防火構造１の施工方法について図５を参照して説明する。 Next, a construction method of the fireproof structure 1 according to the first embodiment will be described with reference to FIG.
防火構造１の施工は、壁材５が軽量鉄骨７に貼り付けられていないことで、壁材２の裏側から作業が可能なときに行われる。 The construction of the fireproof structure 1 is performed when the wall material 5 is not attached to the lightweight steel frame 7 and thus work can be performed from the back side of the wall material 2.
まず図５（ａ）に示すように、各側面板１０の先端が壁材２の壁面２ａに沿うように、鋼製ボックス３を設置する。この際には、孔１２（図４）に挿通したボルトと、これに締結したナットとよって、鋼製ボックス３を支持金具２１に固定する。また、孔１３（図４）に挿通した螺子によって、鋼製ボックス３を壁材２に固定する。 First, as shown in FIG. 5A, the steel box 3 is installed so that the tip of each side plate 10 is along the wall surface 2 a of the wall member 2. At this time, the steel box 3 is fixed to the support fitting 21 by the bolt inserted into the hole 12 (FIG. 4) and the nut fastened thereto. Further, the steel box 3 is fixed to the wall member 2 by a screw inserted into the hole 13 (FIG. 4).
ついで図５（ｂ）に示すように、熱膨張性シート４の幅一方側４ａが側面板１０の外面１０ａに当接し、熱膨張性シート４の幅他方側４ｂが壁材２の壁面２ａに当接するように、熱膨張性シート４を鋼製ボックス３の周方向に延ばす。そして、熱膨張性シート４の幅一方側４ａ及び幅他方側４ｂを、側面板１０の外面１０ａ及び壁材２の壁面２ａに接合する。 Then, as shown in FIG. 5B, one side 4a of the width of the heat-expandable sheet 4 abuts on the outer surface 10a of the side plate 10, and the other side 4b of the width of the heat-expandable sheet 4 contacts the wall surface 2a of the wall member 2. The thermally expandable sheet 4 is extended in the circumferential direction of the steel box 3 so as to abut. Then, the one width side 4a and the other width side 4b of the thermally expandable sheet 4 are joined to the outer surface 10a of the side plate 10 and the wall surface 2a of the wall member 2.
ついで図５（ｃ）に示すように、壁材２に貫通孔２０を形成する。この際には、鋼製ボックス３の凹部１１の開口と、貫通孔２０とが重なるように、貫通孔２０の形成位置を調整する。 Then, as shown in FIG. 5C, the through hole 20 is formed in the wall member 2. At this time, the formation position of the through hole 20 is adjusted so that the opening of the recess 11 of the steel box 3 and the through hole 20 overlap.
以上の工程で、防火構造１が構成される。この後、貫通孔２０からの作業により、図５（ｄ）に示すように、コネクタ２２を介して凹部１１内に電線２３を引き込むとともに、電線２３をコンセント８等に接続して、コンセント８等を貫通孔２０の周囲に取り付けることが行われる。 The fireproof structure 1 is configured by the above steps. After this, as shown in FIG. 5D, the electric wire 23 is drawn into the recess 11 via the connector 22 by the work from the through hole 20, and the electric wire 23 is connected to the outlet 8 or the like to form the outlet 8 or the like. Is attached around the through hole 20.
或いは、防火構造１を構築するために以下に示す施工が行われてもよい。 Alternatively, the following construction may be performed to construct the fireproof structure 1.
まず図６に示すように、熱膨張性シート４を鋼製ボックス３の周方向に延ばして、熱膨張性シート４の幅一方側４ａを側面板１０の外面１０ａに接合する。 First, as shown in FIG. 6, the thermally expandable sheet 4 is extended in the circumferential direction of the steel box 3, and the one width side 4 a of the thermally expandable sheet 4 is bonded to the outer surface 10 a of the side plate 10.
ついで図７（ａ）に示すように、各側面板１０の先端が壁材２の壁面２ａに沿うように鋼製ボックス３を設置するとともに、側面板１０の先端から延び出た熱膨張性シート４の幅他方側４ｂを、壁材２の壁面２ａに沿うように屈曲させて、壁材２の壁面２ａに接合する。また、図５（ａ）と同様の方法で、鋼製ボックス３を支持金具２１や壁材２に固定する。 Then, as shown in FIG. 7( a ), the steel box 3 is installed so that the tip of each side plate 10 is along the wall surface 2 a of the wall member 2, and the heat-expandable sheet extended from the tip of the side plate 10. The other width side 4b of 4 is bent along the wall surface 2a of the wall material 2 and joined to the wall surface 2a of the wall material 2. Further, the steel box 3 is fixed to the support fitting 21 and the wall member 2 by the same method as in FIG.
ついで図７（ｂ）に示すように、凹部１１の開口と重なるように、貫通孔２０を壁材２に形成する。以上の工程によっても防火構造１が構築され、この後、図７（ｃ）に示すように、コネクタ２２から凹部１１内に引き込んだ電線２３をコンセント８等に接続して、コンセント８等を貫通孔２０の周囲に取り付けることが行われる。 Then, as shown in FIG. 7B, the through hole 20 is formed in the wall member 2 so as to overlap with the opening of the recess 11. The fireproof structure 1 is also constructed by the above steps, and thereafter, as shown in FIG. 7C, the electric wire 23 drawn from the connector 22 into the recess 11 is connected to the outlet 8 or the like, and the outlet 8 or the like is penetrated. Mounting around the hole 20 is performed.
第１実施形態によれば、熱膨張性シート４がテープ状を呈することで、熱膨張性シート４は高い形状追随性を有する。このため、鋼製ボックス３と壁材２との間の隙間を熱膨張性シート４で隙間なく完全に埋めることができる。これにより、火災の発生時には、火災の熱で膨張する熱膨張性シート４によって、火災の熱が鋼製ボックス３と壁材２との間から壁材２の裏側（中空壁６の内部）に侵入することを確実に阻止できる。また鋼製ボックス３の背面板９には熱膨張性シート４が設けられないので、熱膨張性シート４の材料コストや、熱膨張性シート４の接合手間を小さく抑えることができる。以上のことから、第１実施形態の防火構造１は、高い防火性能を実現できるとともに、安価な材料コストで煩雑な手間を要せず施工できるので、費用対効果に優れる。 According to the first embodiment, the heat-expandable sheet 4 has a tape shape, and thus the heat-expandable sheet 4 has a high shape following property. Therefore, the gap between the steel box 3 and the wall member 2 can be completely filled with the thermally expandable sheet 4 without any gap. As a result, when a fire occurs, the heat of the fire expands from the space between the steel box 3 and the wall material 2 to the back side of the wall material 2 (inside the hollow wall 6) by the heat-expandable sheet 4 that expands with the heat of the fire. It can be surely prevented from entering. Further, since the back plate 9 of the steel box 3 is not provided with the heat-expandable sheet 4, the material cost of the heat-expandable sheet 4 and the labor for joining the heat-expandable sheet 4 can be reduced. From the above, the fire protection structure 1 of the first embodiment is highly cost-effective because it can realize high fire protection performance and can be constructed at a low material cost without complicated labor.
また、熱膨張性シート４が側面板１０や壁材２に接合されるので、地震等により鋼製ボックス３が揺れても、熱膨張性シート４が脱落せず、長期にわたり安定した防火性能を実現できる。 Further, since the heat-expandable sheet 4 is joined to the side plate 10 and the wall material 2, even if the steel box 3 is shaken by an earthquake or the like, the heat-expandable sheet 4 does not fall off, and stable fire protection performance is provided for a long time. realizable.
＜第２実施形態＞
次に本発明の第２実施形態について説明する。以下、第１実施形態との相違点について説明し、第１実施形態と共通する点については同一の符号を付して詳細な説明を省略する。
<Second Embodiment>
Next, a second embodiment of the present invention will be described. Hereinafter, differences from the first embodiment will be described, and points common to the first embodiment will be assigned the same reference numerals and detailed description thereof will be omitted.
図８は、第２実施形態に係る防火構造３０を示す斜視図である。図９は、第２実施形態に係る防火構造３０を示す垂直断面図であり、図１０は、第２実施形態に係る防火構造３０を示す水平断面図である。図１１は、第２実施形態に係る防火構造３０の施工工程を説明するための垂直断面図である。 FIG. 8 is a perspective view showing the fire protection structure 30 according to the second embodiment. FIG. 9 is a vertical sectional view showing the fire protection structure 30 according to the second embodiment, and FIG. 10 is a horizontal sectional view showing the fire protection structure 30 according to the second embodiment. FIG. 11 is a vertical cross-sectional view for explaining a construction process of the fire protection structure 30 according to the second embodiment.
第２実施形態の防火構造３０では、熱膨張性シート４の幅一方側４ａが側面板１０の内面１０ｅに接合され、熱膨張性シート４の幅他方側４ｂが貫通孔２０の孔面２０ａに接合されることで、熱膨張性シート４が、鋼製ボックス３の内側から側面板１０と壁材２との間の隙間を塞いでいる。また第１実施形態と同様、背面板９には熱膨張性シート４は接合されていない。 In the fire protection structure 30 of the second embodiment, one widthwise side 4a of the thermally expandable sheet 4 is joined to the inner surface 10e of the side plate 10, and the other widthwise side 4b of the thermally expandable sheet 4 is connected to the hole surface 20a of the through hole 20. By being joined, the thermally expandable sheet 4 closes the gap between the side plate 10 and the wall member 2 from the inside of the steel box 3. Further, as in the first embodiment, the back plate 9 is not joined with the thermally expansive sheet 4.
第２実施形態の防火構造３０を施工する際には、まず図１１（ａ）に示すように、各側面板１０の先端が壁材２の壁面２ａに沿うように、鋼製ボックス３を設置する。この際には、図５（ａ）と同様の方法で、鋼製ボックス３を支持金具２１や壁材２に固定する。 When constructing the fire protection structure 30 of the second embodiment, first, as shown in FIG. 11A, the steel box 3 is installed so that the tip of each side plate 10 is along the wall surface 2 a of the wall material 2. To do. At this time, the steel box 3 is fixed to the support fitting 21 and the wall member 2 by the same method as in FIG.
ついで図１１（ｂ）に示すように、鋼製ボックス３の凹部１１の開口と重なるように、貫通孔２０を壁材２に形成する。 Then, as shown in FIG. 11B, the through hole 20 is formed in the wall member 2 so as to overlap with the opening of the recess 11 of the steel box 3.
ついで、貫通孔２０からの作業で、図１１（ｃ）に示すように、熱膨張性シート４の幅一方側４ａが側面板１０の内面１０ｅに当接し、熱膨張性シート４の幅他方側４ｂが貫通孔２０の孔面２０ａに当接するように、熱膨張性シート４を鋼製ボックス３の周方向に延ばして、熱膨張性シート４の幅一方側４ａを側面板１０の内面１０ｅに接合し、熱膨張性シート４の幅他方側４ｂを貫通孔２０の孔面２０ａに接合する。 Then, by the operation from the through hole 20, as shown in FIG. 11C, the one width side 4a of the heat-expandable sheet 4 abuts the inner surface 10e of the side plate 10, and the other width side of the heat-expandable sheet 4 is contacted. The heat-expandable sheet 4 is extended in the circumferential direction of the steel box 3 so that 4b comes into contact with the hole surface 20a of the through-hole 20, and one widthwise side 4a of the heat-expandable sheet 4 is set to the inner surface 10e of the side plate 10. The other side 4b of the heat-expandable sheet 4 is joined to the hole surface 20a of the through hole 20.
以上の工程で、防火構造３０が構成される。この後、貫通孔２０からの作業により、図１１（ｄ）に示すように、コネクタ２２を介して凹部１１内に電線２３を引き込むとともに、電線２３をコンセント８等に接続して、コンセント８等を貫通孔２０の周囲に取り付けることが行われる。 The fireproof structure 30 is configured by the above steps. Then, as shown in FIG. 11( d ), the electric wire 23 is drawn into the recess 11 via the connector 22 by the work from the through hole 20, and the electric wire 23 is connected to the outlet 8 or the like. Is attached around the through hole 20.
或いは、防火構造３０を構築するために以下に示す施工が行われてもよい。 Alternatively, the following construction may be performed to construct the fire protection structure 30.
まず図１２に示すように、熱膨張性シート４の幅一方側４ａが側面板１０の内面１０ｅに当接するように、熱膨張性シート４を鋼製ボックス３の周方向に延ばし、熱膨張性シート４の幅一方側４ａを側面板１０の内面１０ｅに接合する。 First, as shown in FIG. 12, the heat-expandable sheet 4 is extended in the circumferential direction of the steel box 3 so that one side 4a of the width of the heat-expandable sheet 4 abuts on the inner surface 10e of the side plate 10, and the heat-expandable sheet 4 is expanded. One side 4a of the width of the sheet 4 is joined to the inner surface 10e of the side plate 10.
ついで図１３（ａ）に示すように、各側面板１０の先端が壁材２の壁面２ａに沿うように鋼製ボックス３を設置する。この際には、図５（ａ）と同様の方法で、鋼製ボックス３を支持金具２１や壁材２に固定する。 Then, as shown in FIG. 13A, the steel box 3 is installed so that the tip of each side plate 10 is along the wall surface 2 a of the wall member 2. At this time, the steel box 3 is fixed to the support fitting 21 and the wall member 2 by the same method as in FIG.
ついで図１３（ｂ）に示すように、鋼製ボックス３の凹部１１の開口と重なるように、貫通孔２０を壁材２に形成する。 Then, as shown in FIG. 13B, the through hole 20 is formed in the wall member 2 so as to overlap with the opening of the recess 11 of the steel box 3.
ついで、貫通孔２０からの作業で、図１３（ｃ）に示すように、熱膨張性シート４の幅他方側４ｂを、貫通穴２０の孔面２０ａに沿うように延ばして、貫通孔２０の孔面２０ａに接合する。以上の工程によっても防火構造３０を構築でき、この後、図１３（ｄ）に示すように、コネクタ２２から凹部１１内に引き込んだ電線２３をコンセント８等に接続して、コンセント８等を貫通孔２０の周囲に取り付けることが行われる。 Then, as shown in FIG. 13( c ), the other side 4 b of the thermally expandable sheet 4 is extended along the hole surface 20 a of the through hole 20 by the operation from the through hole 20. It is bonded to the hole surface 20a. The fireproof structure 30 can be constructed by the above steps, and thereafter, as shown in FIG. 13D, the electric wire 23 drawn from the connector 22 into the recess 11 is connected to the outlet 8 or the like, and the outlet 8 or the like is penetrated. Mounting around the hole 20 is performed.
第２実施形態によれば、第１実施形態と同様の効果が得られるとともに、熱膨張性シート４が鋼製ボックス３の内側に設置されるため、熱膨張性シート４が鋼製ボックス３の外側に落下しない。このため、長期にわたって安定した防火性能を実現できる。 According to the second embodiment, the same effect as that of the first embodiment can be obtained, and since the heat-expandable sheet 4 is installed inside the steel box 3, the heat-expandable sheet 4 can be installed in the steel box 3. Do not fall outside. Therefore, stable fire protection performance can be realized over a long period of time.
また、熱膨張性シート４の形状追随性が高いことで、鋼製ボックス３の凹部１１の径と貫通孔２０の径とが一致する場合や相違する場合でも、熱膨張性シート４で側面板１０と壁材２との間の隙間を塞ぐことができる。すなわち図１４（ａ）に示すように、凹部１１の径と貫通孔２０の径とが一致する場合には、熱膨張性シート４は直線状に延びて側面板１０の内面１０ｅや貫通孔２０の孔面２０ａに沿うものとなって、側面板１０と壁材２との間の隙間を塞ぐ。また図９に示すように凹部１１の径が貫通孔２０の径よりも大きい場合や、図１４（ｂ）に示すように凹部１１の径が貫通孔２０の径よりも小さい場合には、熱膨張性シート４は、Ｓ字状に屈曲して内面１０ｅや孔面２０ａに沿うものとなって、側面板１０と壁材２との間の隙間を塞ぐ。 Further, since the shape-following property of the heat-expandable sheet 4 is high, even when the diameter of the recess 11 of the steel box 3 and the diameter of the through hole 20 are the same or different, the heat-expandable sheet 4 is used as the side plate. The gap between 10 and the wall material 2 can be closed. That is, as shown in FIG. 14A, when the diameter of the recess 11 and the diameter of the through hole 20 are the same, the thermally expandable sheet 4 extends linearly and the inner surface 10 e of the side plate 10 and the through hole 20. Along the hole surface 20a, and closes the gap between the side surface plate 10 and the wall member 2. Further, when the diameter of the recess 11 is larger than the diameter of the through hole 20 as shown in FIG. 9 or when the diameter of the recess 11 is smaller than the diameter of the through hole 20 as shown in FIG. The expansive sheet 4 is bent in an S shape to be along the inner surface 10e and the hole surface 20a, and closes the gap between the side surface plate 10 and the wall member 2.
本発明は上記第１及び第２実施形態に示す例に限定されず、種々変更することができる。 The present invention is not limited to the examples shown in the first and second embodiments, and can be variously modified.
例えば上記第１及び第２実施形態では、熱膨張性シート４の幅は、該熱膨張性シート４によって側面板１０と壁材２との間の隙間を埋めて防火効果が確保される限り、任意の幅に設定され得る。 For example, in the above-described first and second embodiments, the width of the heat-expandable sheet 4 is set as long as the heat-expandable sheet 4 fills the gap between the side plate 10 and the wall material 2 to ensure the fire prevention effect. It can be set to any width.
また上記第１及び第２実施形態では、必ずしも熱膨張性シート４を４つの側面板１０に設ける必要はなく、防火効果が確保される限りにおいて、４つの側面板１０のうちの１つ、２つ、又は３つの側面板１０に熱膨張性シート４を設けるようにしてもよい。 Moreover, in the said 1st and 2nd embodiment, it is not necessary to necessarily provide the heat-expandable sheet 4 to the four side plates 10, and as long as a fireproof effect is ensured, one of the four side plates 10 and 2 may be used. The thermally expandable sheet 4 may be provided on one or three side plates 10.
また上記第１及び第２実施形態では、必ずしも鋼製ボックス３の背面板９の形状が略正方形である必要もなく、背面板９は、略長方形のような他の矩形であってよいし、矩形以外の形状をしていてもよい。 Further, in the first and second embodiments, the shape of the back plate 9 of the steel box 3 does not necessarily have to be a substantially square shape, and the back plate 9 may be another rectangular shape such as a substantially rectangular shape. It may have a shape other than a rectangle.
また図１５に示すように、側面板１０の外面１０ａと壁材２の壁面２ａとに接合される熱膨張性シート４Ａと、側面板１０の内面１０ｅと貫通孔２０の孔面２０ａとに接合される熱膨張性シート４Ｂとの双方を設けて、これら熱膨張性シート４Ａ，４Ｂにより鋼製ボックス３の外側及び内側から側面板１０と壁材２との間の隙間を塞いでもよい。 Further, as shown in FIG. 15, the thermally expansive sheet 4A joined to the outer surface 10a of the side plate 10 and the wall surface 2a of the wall member 2, the inner surface 10e of the side plate 10 and the hole surface 20a of the through hole 20 are joined. It is also possible to provide both of these heat-expandable sheets 4B and the heat-expandable sheets 4A and 4B to close the gap between the side plate 10 and the wall material 2 from the outside and the inside of the steel box 3.
また上記第１及び第２実施形態では、中空壁６を構成する壁材２に鋼製ボックス３を取り付ける例を示したが、鋼製ボックス３は、片壁に取り付けられてもよい。この場合、片壁は、例えばＳウオール（吉野石膏登録商標）と称される耐火ボードから構成され、片壁には、コンセント８やスイッチを設置するための貫通孔が形成される。鋼製ボックス３は、側面板１０の先端が片壁の貫通孔の周囲に沿うように設置される。テープ状の熱膨張性シート４は、側面板１０の外面１０ａと片壁の裏側壁面との双方に接するように鋼製ボックス３の周方向に延びて、側面板１０の外面１０ａと片壁の裏側壁面に接合することで、側面板１０と片壁との間の隙間を鋼製ボックス３の外側から塞ぐものとされる。或いは、テープ状の熱膨張性シート４は、側面板１０の内面１０eと片壁の貫通孔の孔面との双方に接するように鋼製ボックス３の周方向に延びるとともに、側面板１０の内面１０eと片壁の貫通孔の孔面に接合することで、側面板１０と片壁との間の隙間を鋼製ボックス３の内側から塞ぐものとされる。 Moreover, in the said 1st and 2nd embodiment, although the example which attaches the steel box 3 to the wall material 2 which comprises the hollow wall 6 was shown, the steel box 3 may be attached to one wall. In this case, one wall is made of, for example, a fireproof board called S-wall (Yoshino Gypsum registered trademark), and a through hole for installing the outlet 8 and the switch is formed in the one wall. The steel box 3 is installed so that the tip of the side plate 10 is along the periphery of the through hole of the one wall. The tape-shaped thermally expandable sheet 4 extends in the circumferential direction of the steel box 3 so as to be in contact with both the outer surface 10a of the side plate 10 and the back side wall surface of the one wall, and the outer surface 10a of the side plate 10 and the one wall. By joining to the back wall surface, the gap between the side plate 10 and the one wall is closed from the outside of the steel box 3. Alternatively, the tape-shaped thermally expandable sheet 4 extends in the circumferential direction of the steel box 3 so as to be in contact with both the inner surface 10e of the side plate 10 and the hole surface of the through hole of one wall, and the inner surface of the side plate 10 The gap between the side plate 10 and the one wall is closed from the inside of the steel box 3 by joining 10e to the hole surface of the through hole of the one wall.
１，３０ 防火構造
２ 壁材
２ａ 壁材の壁面
３ 鋼製ボックス
４ 熱膨張性シート
４ａ 熱膨張性シートの幅一方側
４ｂ 熱膨張性シートの幅他方側
９ 背面板
１０ 側面板
１０ａ 側面板の外面
１０ｅ 側面板の内面
２０ 貫通孔
２０ａ 貫通孔の孔面
1,30 Fire protection structure 2 Wall material 2a Wall material wall surface 3 Steel box 4 Thermally expandable sheet 4a Thermally expandable sheet width one side 4b Thermally expandable sheet width other side 9 Back plate 10 Side plate 10a Side plate Outer surface 10e Inner surface 20 of side plate Through hole 20a Hole surface of through hole
Claims (8)
背面板と、前記背面板の周縁から立設される側面板とから構成されて、前記背面板の反対面に開口を有し、当該開口を前記壁材の貫通孔に向けて、前記側面板の先端が前記壁材の貫通孔の周囲に沿うように設置される鋼製ボックスと、
前記側面板と前記壁材の双方に接するように前記鋼製ボックスの周方向の全周に延びるとともに、一方側の表面が前記側面板と前記壁材とに接合することで、前記側面板と前記壁材との間の隙間を塞ぐテープ状の熱膨張性シートとを備え、
前記背面板には、前記熱膨張性シートが接合されない防火構造。 A wall material for a building in which a through hole is formed,
The side plate is composed of a back plate and a side plate standing upright from the periphery of the back plate, has an opening on the opposite surface of the back plate, and the opening faces the through hole of the wall member. A steel box installed so that the tip of the wall is along the periphery of the through hole of the wall material,
While extending the entire circumference in the circumferential direction of the steel box so as to contact both the side plate and the wall material, the one side surface is joined to the side plate and the wall material, and A tape-shaped heat-expandable sheet that closes the gap between the wall material and
A fireproof structure in which the thermal expansion sheet is not joined to the back plate.
前記側面板の先端が前記壁材の壁面に沿うように、前記鋼製ボックスを設置する工程と、
前記熱膨張性シートの幅一方側が前記側面板の外面に当接し、前記熱膨張性シートの幅他方側が前記壁材の壁面に当接するように、前記熱膨張性シートを鋼製ボックスの周方向に延ばして、前記熱膨張性シートの幅一方側及び幅他方側を、それぞれ前記側面板の外面及び前記壁材の壁面に接合する工程と、
前記鋼製ボックスの開口と重なるように、前記壁材に前記貫通孔を形成する工程とを有する防火構造の施工方法。 The method for constructing a fireproof structure according to claim 3,
A step of installing the steel box, such that the tip of the side plate is along the wall surface of the wall material,
One side of the width of the heat-expandable sheet is in contact with the outer surface of the side plate, the other side of the width of the heat-expandable sheet is in contact with the wall surface of the wall material, the heat-expandable sheet in the circumferential direction of the steel box. And a step of joining the width one side and the other width side of the heat-expandable sheet to the outer surface of the side plate and the wall surface of the wall material, respectively.
And a step of forming the through hole in the wall material so as to overlap the opening of the steel box.
前記熱膨張性シートの幅一方側が前記側面板の外面に当接するように、前記熱膨張性シートを前記鋼製ボックスの周方向に延ばして、前記熱膨張性シートの幅一方側を前記側面板の外面に接合する工程と、
前記側面板の先端が前記壁材の壁面に沿うように前記鋼製ボックスを設置するとともに、前記側面板の先端から延び出た前記熱膨張性シートの幅他方側を、前記壁材の壁面に沿うように屈曲させて、前記壁材の壁面に接合する工程と、
前記鋼製ボックスの開口と重なるように、前記貫通孔を前記壁材に形成する工程とを有する防火構造の施工方法。 The method for constructing a fireproof structure according to claim 3,
The heat-expandable sheet is extended in the circumferential direction of the steel box so that one side of the heat-expandable sheet comes into contact with the outer surface of the side plate, and the one side of the width of the heat-expandable sheet is the side plate. The step of joining to the outer surface of
While installing the steel box so that the tip of the side plate is along the wall surface of the wall material, the other side of the width of the thermally expandable sheet extending from the tip of the side plate, the wall surface of the wall material Bending along, joining to the wall surface of the wall material,
And a step of forming the through hole in the wall material so as to overlap the opening of the steel box.
前記側面板の先端が前記壁材の壁面に沿うように、前記鋼製ボックスを設置する工程と、
前記鋼製ボックスの開口と重なるように、前記貫通孔を前記壁材に形成する工程と、
前記熱膨張性シートの幅一方側が前記側面板の内面に当接し、前記熱膨張性シートの幅他方側が前記貫通孔の孔面に当接するように、前記熱膨張性シートを前記鋼製ボックスの周方向に延ばして、前記熱膨張性シートの幅一方側を前記側面板の内面に接合し、前記熱膨張性シートの幅他方側を前記貫通孔の孔面に接合する工程とを有する防火構造の施工方法。 The method of constructing a fireproof structure according to claim 4,
A step of installing the steel box, such that the tip of the side plate is along the wall surface of the wall material,
A step of forming the through hole in the wall material so as to overlap with the opening of the steel box;
One side of the width of the heat-expandable sheet abuts the inner surface of the side plate, the other side of the width of the heat-expandable sheet abuts the hole surface of the through- hole , the heat-expandable sheet of the steel box Extending in the circumferential direction, the one side of the width of the thermally expandable sheet is joined to the inner surface of the side plate, and the other side of the width of the thermally expandable sheet is joined to the hole surface of the through hole Construction method.
前記熱膨張性シートの幅一方側が前記側面板の内面に当接するように、前記熱膨張性シートを前記鋼製ボックスの周方向に延ばして、前記熱膨張性シートの幅一方側を前記側面板の内面に接合する工程と、
前記側面板の先端が壁材の壁面に沿うように鋼製ボックスを設置する工程と、 前記鋼製ボックスの開口と重なるように、前記貫通孔を前記壁材に形成する工程と、
前記側面板の先端から延び出た前記熱膨張性シートの幅他方側を、前記貫通孔の孔面に沿うように延ばして、前記貫通孔の孔面に接合する工程とを有する防火構造の施工方法。 The method of constructing a fireproof structure according to claim 4,
The thermally expandable sheet is extended in the circumferential direction of the steel box so that one side of the thermally expandable sheet comes into contact with the inner surface of the side plate, and the one side of the thermally expandable sheet is provided at the side plate. The step of joining to the inner surface of
A step of installing a steel box so that the tip of the side plate is along the wall surface of the wall material; a step of forming the through hole in the wall material so as to overlap with the opening of the steel box;
The other side of the width of the heat-expandable sheet extending from the tip of the side plate is extended along the hole surface of the through hole, and the step of joining the hole surface of the through hole Method.
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