JP3763511B2

JP3763511B2 - Adiabatic and airtight structure at the connection of beams

Info

Publication number: JP3763511B2
Application number: JP2000185770A
Authority: JP
Inventors: 惠一冨山; 博上谷; 美樹小谷
Original assignee: Sekisui House Ltd
Current assignee: Sekisui House Ltd
Priority date: 2000-06-21
Filing date: 2000-06-21
Publication date: 2006-04-05
Anticipated expiration: 2020-06-21
Also published as: JP2002004452A

Description

【０００１】
【発明の属する技術分野】
本発明は、住宅等の建物の断熱気密構造、特に、直線的に配置された外周梁とそれに直交する梁つなぎとの接続部における断熱気密構造に関するものである。
【０００２】
【従来の技術】
近年、住宅には、計画的な換気による住宅の快適性の向上や、断熱性の向上による省エネルギー化を図るために、住宅の気密性が求められるようになってきている。一般に、気密住宅とは、気密性能を表す相当隙間面積が床面積１平方メートル当たり５平方センチメートル以下のものをいい、これを達成するために、住宅の内部空間全体を気密面で囲うように気密工法が施工される。
【０００３】
気密面の設定の方法として、住宅の各階のそれぞれを、独自の気密面で囲う方法と、住宅の全体を気密面で囲う方法とがある。後者を採用した場合には、気密工法を施工する面積が少なくなるという利点があるが、各階の間の梁部分、特に梁の接続部の気密を確保することが難しい。
【０００４】
現在、住宅の各階、例えば１階と２階との間に設けられた梁部分の気密を確保する方法として、湿式気密工法と乾式気密工法とがある。湿式気密工法は、梁の接続部等にウレタン等の樹脂を吹き付けることにより気密性を確保するものであるが、ウレタンを吹き付ける際に、有毒ガスの疑いがある塩素系ガスが発生するので、作業者の安全を確保するために、同時進行で内装工事等を施工することができない。また、ウレタンの吹付けは、大工等は行うことができず、専門工を必要とする。これらにより、湿式気密工法は、施工効率が悪いという問題があった。更に、ウレタンはその発泡のために通常はフロンガスを使用しており、環境面からも問題があった。
【０００５】
一方、乾式気密工法では、上記問題を解決することができるが、梁の接続部等は、その形状が複雑なものであるため、気密性を確保することが困難であった。すなわち、図１２に示すように、Ｈ型の外周梁１の屋内側に、接続端部６を有するＣ型の梁つなぎ２が直交して当接し、該接続端部６に設けられた挿通孔と外周梁１に設けられた挿通孔とに挿通されるボルト１６により固定される接続部Ａにおいては、図１３に示すように、外周梁１の屋内側面に外周断熱材３を配置し、その上に発泡ポリエチレン等からなる気密シート４を密着させ、該気密シート４の端部と梁つなぎ２の接続端部６の間に生じた隙間に気密テープ２４を折り曲げながら貼り付けることにより密封し、外周梁１の屋内側面に沿って気密性を確保していた。
【０００６】
【発明が解決しようとする課題】
しかし、このような従来の工法では、梁の接続部の形状に従い、適宜、現場において気密シート４の加工が必要となるが、梁の接続部の形状は複雑であるので、その加工は容易でない。また、気密テープ２４を複雑な形状に合わせて折り曲げながら貼り付けるので、気密テープ２４に歪みや隙間が生じやすく、これにより、気密性を十分に確保できないという問題がある。更に、梁つなぎ２が接続されている外周梁１は外気に接しているので、外気の温度が屋内の気温よりも低い場合には、外周梁１を通して梁つなぎ２までもが低温となることがある。このため、屋内の比較的暖かく湿った空気と接している梁つなぎ２に結露が発生し易いという問題もある。
【０００７】
本発明は、上記の点に鑑みてなされたものであり、住宅等の建物の断熱気密構造、特に、直線的に配置された外周梁とそれに直交する梁つなぎとの接続部において、簡易な施工により確実に気密性を確保できるようにするとともに、結露が生じないようにすることができる梁の接続部の断熱気密構造を提供することを技術課題とするものである。
【０００８】
【課題を解決するための手段】
上記技術課題を解決するための具体的手段は、次のようなものである。すなわち、請求項１に記載する梁の接続部における断熱気密構造は、直線的に配置された外周梁とそれに直交する屋内側の梁つなぎとの接続部における断熱気密構造であって、前記外周梁の屋内側面を外周断熱材により覆い、該外周断熱材の屋内側面に気密シートを密着させて覆い、前記接続部に、前記気密シートの屋内側面に密着する外周密着面と、前記梁つなぎの接続端部に密着する端部密着面とを備える気密カバーを密着させ、前記接続部から屋内側へ所定距離だけ離れた位置までにおける前記梁つなぎの周囲に、該梁つなぎの周囲の形状に合致する断熱部材からなる断熱部と、該断熱部の外周に一体的に設けられた気密部材であって、その屋外側端部には前記気密カバーの屋内側面に密着するカバー密着面を有し、その屋内側端部には前記断熱部より屋内側における前記梁つなぎの周囲に密着する梁つなぎ密着面を有する気密部とを備える断熱気密カバーを密着させたことを特徴とするものである。
【０００９】
請求項２に記載する梁の接続部における断熱気密構造は、請求項１に記載する構成において、前記梁つなぎが内部に空洞を有する場合において、該空洞部における前記断熱気密カバーの梁つなぎ密着面の内側位置に、前記空洞部の断面形状に合致する形状の断熱気密パッキングを嵌入したことを特徴とするものである。
【００１０】
請求項３に記載する梁の接続部における断熱気密構造は、請求項１又は２に記載する構成において、前記気密カバーは、前記外周密着面が平面形状に形成され、前記端部密着面が前記梁つなぎの接続端部の形状に合致する嵌合凹溝を有して形成されていることを特徴とするものである。
【００１１】
請求項４に記載する梁の接続部における断熱気密構造は、請求項１〜３のいずれか１項に記載する構成において、前記断熱気密カバーは、前記断熱部が前記梁つなぎの周囲の形状と略同一形状の密着面を有して一定厚さに形成され、前記気密部が前記断熱部の周囲に密着して覆う周囲気密面と、該周囲気密面に垂直に形成されて前記気密カバーに密着する平面形状のカバー密着面と、前記断熱部より屋内側における前記梁つなぎの周囲の形状と略同一形状の梁つなぎ密着面とを有して形成されたことを特徴とするものである。
【００１２】
【発明の実施の形態】
以下、本発明に係る梁の接続部における断熱気密構造について図面に基づいて説明する。本発明の第１実施形態に係る梁の接続部における断熱気密構造は、図１に示すように、直線的に配置された外周梁１とそれに直交する屋内側の梁つなぎ２との接続部Ａにおける断熱気密構造であって、外周梁１の屋内側面を外周断熱材３により覆い、該外周断熱材３の屋内側面に気密シート４を密着させて覆い、接続部Ａに、気密シート４の屋内側面に密着する外周密着面５と、梁つなぎ２の接続端部６（図３参照）に密着する端部密着面７とを備える気密カバー８を密着させ、接続部Ａから屋内側へ所定距離Ｌだけ離れた位置までにおける梁つなぎ２の周囲に、該梁つなぎ２の周囲の形状に合致する断熱部材からなる断熱部９（図９参照）と、該断熱部９の外周に一体的に設けられた気密部材であって、その屋外側端部には前記気密カバー８の屋内側面に密着するカバー密着面１０を有し、その屋内側端部には前記断熱部９より屋内側における前記梁つなぎ２の周囲に密着する梁つなぎ密着面１１を有する気密部１２とを備える断熱気密カバー１３を密着させるとともに、梁つなぎ２の空洞部における断熱気密カバー１３の梁つなぎ密着面１１の内側位置に、空洞部の断面形状に合致する形状の断熱気密パッキング１４を嵌入したものである。以下更に詳細に説明する。
【００１３】
図２は、住宅の各階、例えば１階と２階との間に設けられた梁の配置を示した平面図であり、図中の斜線部は気密面を設けて気密性を確保すべき部分を示している。該気密面に沿って配置される外周梁１とそれに直交する梁つなぎ２とが接続するのは、図中の接続部Ａである。この接続部Ａにおいては、図３に示すように、Ｈ形断面の外周梁１の屋内側面に、接続端部６を有するＣ形断面の梁つなぎ２が当接され、該接続端部６に設けられた挿通孔と外周梁１のウェブ１５に設けられた挿通孔とに挿通されたボルト１６により固定されて構成されている。梁つなぎ２の接続端部６は、梁つなぎ２から延設された平板状部分であって、その屋外側端部は外周梁１のウェブに当接するために直角に折り曲げられて形成されている。外周梁１は、軸組１７の上に配置されており、該軸組１７の屋内側には断熱内壁枠１８が配設されている。
【００１４】
そして、図４に示すように、前記外周梁１の屋内側のＨ形溝に外周断熱材３を隙間なく配設することにより屋内側面を断熱材により覆う。該外周断熱材３は、例えばグラスウール等の断熱素材を、予め配設すべき空間に合致するように形成した袋体内に詰めたもの等を使用することができる。該袋体は、断熱素材の飛散等を防止するために合成樹脂等の隙間のない部材によって形成する。また、外周梁１と断熱内壁枠１８との間に形成される空間にも隙間断熱材１９を隙間なく配設する。
【００１５】
次に、図５に示すように、前記外周断熱材３の屋内側面に気密シート４を密着させて配置する。この際、梁つなぎ２の接続端部６の一側面６ａ側に配置される一側面側気密シート４ａと他側面６ｂ側に配置される他側面側気密シート４ｂとを重ね合わせて配置する。ここでは、一側面側気密シート４ａの重合端部４ｃを直線形状として梁つなぎ２の接続端部６の一側面６ａに沿って配置するとともに、他側面側気密シート４ｂの重合端部４ｄに梁つなぎ２の接続端部６の上下方向の長さに合わせたコ字形の切欠き４ｅを形成して該切欠き４ｅに接続端部６を入れ、接続端部６の上下において一側面側気密シート４ａと重ね合わせる構成としている。また、気密シート４の上端側４ｆは外周梁１の上面に載置されて床下地を構成する軽量気泡コンクリート板２５の下面に沿って水平方向に折り曲げ、下端側は隙間断熱材１９及び断熱内壁枠１８の上部を覆うようにして貼り付ける。気密シート４としては、例えばシート状に形成した発泡ポリエチレンなどを使用することができる。
【００１６】
その後、図６に示すように、外周梁１と梁つなぎ２との接続部Ａには、気密カバー８を密着させて配置する。該気密カバー８は、図７にも示すように、一側面側気密シート４ａの屋内側面に密着する外周密着面５ａと、梁つなぎ２の接続端部６の一側面６ａに密着する端部密着面７ａと、気密シート４の上端側４ｆの下面に密着する上面密着面２０とを備える第１気密カバー８ａと、該第１気密カバー８ａに対して対称に形成され、他側面側気密シート４ｂの屋内側面に密着する外周密着面５ｂと、梁つなぎ２の接続端部６の他側面６ｂに密着する端部密着面７ｂと、気密シート４の上端側４ｆの下面に密着する上面密着面２０とを備える第２気密カバー８ｂとから構成される。
【００１７】
第１気密カバー８ａ及び第２気密カバー８ｂの前記外周密着面５ａ、５ｂは、前記気密シート４の重合部近傍の屋内側面を覆う略矩形の平面形状に形成されている。前記端部密着面７ａ、７ｂは、外周密着面５ａ、５ｂに対して直角、すなわち、梁つなぎ２の接続端部６の両側面６ａ、６ｂに対して平行な平面形状であって、その上下方向中央部近傍には、接続端部６の形状に合致するように第１気密カバー８ａと第２気密カバー８ｂとが結合した状態で接続端部６の外周形状と略同一形状の密着面を構成する嵌合凹溝２１ａ、２１ｂがそれぞれ形成されており、該嵌合凹溝２１ａ、２１ｂをそれぞれ接続端部６の一側面６ａ、他側面６ｂに嵌合させて密着させることができるようになっている。前記上面密着面２０は、外周密着面５ａ、５ｂ及び端部密着面７ａ、７ｂの上端部において、これらに対して直角に、すなわち、地面に対して平行に設けられる平面状部分である。
【００１８】
ここで、気密カバー８としては、例えばシート状のポリエチレンやポリプロピレンを所定の形状に形成したもの等を使用することができる。そして、図示しないが、第１気密カバー８ａ及び第２気密カバー８ｂにおける外周密着面５ａ、５ｂ、端部密着面７ａ、７ｂ、嵌合凹溝２１ａ、２１ｂ及び上面密着面２０には、あらかじめ両面粘着テープが設けられており、それぞれ密着すべき面に対して容易に密着させることができ、気密性を確保することができるようになっている。
【００１９】
次に、図１に示すように、外周梁１と梁つなぎ２との接続部Ａから屋内側へ所定距離Ｌだけ離れた位置までにおける梁つなぎ２の周囲に断熱気密カバー１３を密着させて配置する。ここで、断熱気密カバー１３は、図８にも示すように、梁つなぎ２に対して一側面２ａ側から密着する第１断熱気密カバー１３ａと他側面２ｂ側から密着する第２断熱気密カバー１３ｂとから構成されており、第１断熱気密カバー１３ａと第２断熱気密カバー１３ｂとは、それぞれ梁つなぎ２の周囲に密着する断熱部材からなる断熱部９と該断熱部９の外周を覆う気密部材からなる気密部１２とを有している。
【００２０】
前記断熱部９は、図１及び図９に示すように、第１断熱気密カバー１３ａと第２断熱気密カバー１３ｂとが結合した状態において、梁つなぎ２の周囲の形状と略同一形状の密着面を内側に有する一定厚さの中空四角柱形状に形成されており、前記接続部Ａから屋内側へ所定距離Ｌだけ離れた位置までにおける梁つなぎ２の周囲を覆う長さを有した断熱部材である。該所定距離Ｌとしては、外周梁１を通して屋内の気温よりも低温となる部分を覆い結露を防止するために十分な距離とし、例えば、前記接続部Ａから５０〜１００ｃｍ程度とする。断熱部９を構成する断熱部材としては、例えばグラスウール等の断熱素材を、予め断熱部９の形状に合致するように形成した袋体内に詰めたもの等を使用することができる。該袋体は、断熱素材の飛散等を防止するために合成樹脂等の隙間のない部材によって形成する。
【００２１】
前記気密部１２は、断熱部９の外周に一体的に設けられた気密部材であって、第１断熱気密カバー１３ａと第２断熱気密カバー１３ｂとが結合した状態において、断熱部９の周囲に密着して覆う周囲気密面２２と、該周囲気密面２２の屋外側端部に形成されて前記気密カバー８に密着するカバー密着面１０と、周囲気密面２２の屋内側端部に形成されて前記断熱部９により覆われた部分よりも屋内側における梁つなぎ２の周囲に密着する梁つなぎ密着面１１とを有して形成されている。ここで、前記周囲気密面２２は、断熱部９の周囲の形状と略同一形状の四角柱形状に形成されるとともに、その屋内側端部には断熱部９の屋内側端面に密着する段差部２２ａが形成され、断熱部９の周囲に密着して一体的に形成されている。前記カバー密着面１０は、周囲気密面２２の屋外側端部の外周において周囲気密面２２に対して垂直な面を延設することにより平面形状に形成されている。前記梁つなぎ密着面１１は、周囲気密面２２の屋内側端部の段差部２２ａに対して垂直な梁つなぎ２の周囲の形状と略同一形状の四角柱形状に形成されている。
【００２２】
また、本実施形態においては、図８及び図９に示すように、気密カバー８は、梁つなぎ２の他側面２ｂを含む平面に沿って２個に分割することにより第１断熱気密カバー１３ａと第２断熱気密カバー１３ｂとを形成しており、第１断熱気密カバー１３ａは梁つなぎ２の上面２ｃ、下面２ｄ及び一側面２ａを覆う断面略コ字形部分で構成され、第２断熱気密カバー１３ｂは、梁つなぎ２の他側面２ｂを覆う断面略Ｉ字形部分で構成されている。そして、第１断熱気密カバー１３ａと第２断熱気密カバー１３ｂとの結合部には、それぞれ上下に垂直方向に延設された結合面２３が設けられており、該結合面２３において密着することにより気密性を確保しつつ一体的に結合するようになっている。そして、図示しないが、第１断熱気密カバー１３ａ及び第２断熱気密カバー１３ｂにおける断熱部９の密着面、気密部のカバー密着面１０、梁つなぎ密着面１１及び結合面２３には、あらかじめ両面粘着テープが設けられており、それぞれ密着すべき面に対して容易に密着させることができ、気密性を確保することができるようになっている。これにより、断熱気密カバー１３は、接続部Ａから屋内側へ所定距離Ｌだけ離れた位置までにおける梁つなぎ２の周囲の断熱性及び気密性を確保することができる。
【００２３】
そして、図１、図８及び図１０に示すように、Ｃ形断面の梁つなぎ２の内部の空洞部における前記断熱気密カバー１３の梁つなぎ密着面１１の内側位置には、前記空洞部の断面形状に合致する形状の断熱気密パッキング１４を嵌入する。該断熱気密パッキング１４は、梁つなぎ２の内部の空洞部の形状に合わせて、該空洞部の断面形状と略同一の断面形状を有するように形成した断熱気密部材であり、具体的には、発泡ポリエチレン等の弾力性及び気密性を有するブロックを所定の形状に成形したもの等を使用することができる。これにより、梁つなぎ２の内部の空洞部を通る空気の流れを断熱気密カバー１３の梁つなぎ密着面１１の内側位置において遮断することができるので、断熱気密カバー１３により囲まれた空洞部に屋内の空気が流入することを防止することができるので、比較的低温になっている梁つなぎ２の屋外側の内側面に結露が生じることがない。断熱気密パッキング１４の取付けは、前記断熱気密カバー１３の取付けよりも先に行うことも可能であり、後から行うことも可能である。なお、本実施形態においては、Ｃ形断面の梁つなぎ２としているが、これに限定されるものではなく、梁つなぎ２の断面形状が四角形断面、円形断面、コ字形断面、Ｈ形断面等、他の断面形状である場合においても全く同様の構造とすることができる。
【００２４】
また、本発明の第２実施形態に係る梁の接続部における断熱気密構造は、前記第１の実施形態に係る梁の接続部における断熱気密構造において、前記断熱気密パッキング１４を設けない構造としたものである。すなわち、梁つなぎ２の断面形状がＨ形断面やコ字形断面である場合等のように梁つなぎ２の空洞部が大きく開口している場合や空洞部を有しない場合には、図１１に示すように、前記断熱気密カバー１３の断熱部９の密着面の形状を梁つなぎ２の全周囲に密着させることができる形状とすることにより、前記断熱気密パッキング１４を設けない構造とすることができる。本実施形態においては、梁つなぎ２の断面形状がＨ形断面であるので、断熱気密カバー１３の断熱部９の密着面の形状をそれに合わせてＨ形に形成し、梁つなぎ２の全周囲に密着させて配置している。これにより、前記断熱気密パッキング１４を設けた場合と同様に、断熱気密カバー１３により囲まれた空洞部に屋内の空気が流入することを防止することができる。
【００２５】
【発明の効果】
以上説明したように、本発明の請求項１に係る梁の接続部における断熱気密構造によれば、外周梁の屋内側面は外周断熱材により、接続部から屋内側へ所定距離だけ離れた位置までにおける前記梁つなぎの周囲は断熱気密カバーの断熱部によりそれぞれ断熱されるとともに、気密シート、気密カバー及び断熱気密カバーの気密部により断熱部材の屋内側に気密面を形成しているので、外部の空気により冷やされて低温になった外周梁及び梁つなぎの屋外側部分が、屋内の比較的暖かく湿った空気に触れることがなく、梁の周囲に結露が生じることを防止することができる。また、前記気密カバー及び前記断熱気密カバーを用いることにより、外周梁と梁つなぎとの接続部の複雑な形状の部分に被せて密着させるだけで容易に且つ確実に気密性を確保することができる。
【００２６】
本発明の請求項２に係る梁の接続部における断熱気密構造によれば、前記梁つなぎの内部の空洞部における前記断熱気密カバーの梁つなぎ密着面の内側位置に、前記空洞部の断面形状に合致する形状の断熱気密パッキングを嵌入したことにより、前記梁つなぎが内部に空洞を有する場合においても梁つなぎの屋外側部分の断熱性及び気密性を確保することができ、上述の請求項１に係る梁の接続部における断熱気密構造と同様の効果を得ることができる。
【００２７】
本発明の請求項３に係る梁の接続部における断熱気密構造によれば、上述の効果に加えて、前記気密カバーは、前記外周密着面が平面形状に形成され、前記端部密着面が前記梁つなぎの接続端部の形状に合致する嵌合凹溝を有して形成されていることにより、前記外周梁と梁つなぎとの接続部の複雑な形状の部分に容易且つ確実に密着させることができるので、簡易な施工で確実に気密性を確保することができる。
【００２８】
本発明の請求項４に係る梁の接続部における断熱気密構造によれば、上述の効果に加えて、前記断熱気密カバーは、前記断熱部が前記梁つなぎの周囲の形状と略同一形状の密着面を有して一定厚さに形成され、前記気密部が前記断熱部の周囲に密着して覆う周囲気密面と、該周囲気密面に垂直に形成されて前記気密カバーに密着する平面形状のカバー密着面と、前記断熱部より屋内側における前記梁つなぎの周囲の形状と略同一形状の梁つなぎ密着面とを有して形成されたことにより、前記外周梁と梁つなぎとの接続部及び梁つなぎの周囲の複雑な形状の部分に容易且つ確実に密着させることができるので、簡易な施工で確実に断熱性及び気密性を確保することができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る梁の接続部における断熱気密構造を示す斜視図である。
【図２】住宅の各階の間に設けられた梁の配置を示した平面図である。
【図３】外周梁と梁つなぎとの接続部の構造を示す斜視図である。
【図４】梁の接続部に断熱材を配置した状態を示す斜視図である。
【図５】梁の接続部に気密シートを配置した状態を示す斜視図である。
【図６】梁の接続部に気密カバーを配置した状態を示す斜視図である。
【図７】本発明の実施形態に係る気密カバーを示す斜視図である。
【図８】本発明の実施形態に係る断熱気密カバーを示す斜視図である。
【図９】梁の接続部における断熱気密構造を断熱気密カバーの断熱部において切断した断面を示す断面図である。
【図１０】梁の接続部における断熱気密構造を断熱気密カバーの梁つなぎ密着部において切断した断面を示す断面図である。
【図１１】本発明の第２実施形態に係る梁の接続部における断熱気密構造を示す断面図である。
【図１２】従来例に係る外周梁と梁つなぎとの接続部の構造を示す斜視図である。
【図１３】従来例に係る梁の接続部における断熱気密構造を示す斜視図である。
【符号の説明】
１外周梁
２梁つなぎ
３外周断熱材
４気密シート
８気密カバー
９断熱部
１２気密部
１３断熱気密カバー
１４断熱気密パッキング
Ａ接続部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat-insulating and air-tight structure of a building such as a house, and more particularly to a heat-insulating and air-tight structure at a connecting portion between a linearly arranged outer peripheral beam and a beam connecting member orthogonal thereto.
[0002]
[Prior art]
In recent years, houses have been required to have airtightness in order to improve the comfort of the house by planned ventilation and to save energy by improving the heat insulation. In general, an airtight house is one with an equivalent clearance area representing airtight performance of 5 square centimeters or less per square meter of floor area. To achieve this, an airtight construction method is used to surround the entire interior space of the house with an airtight surface. It is constructed.
[0003]
As a method for setting an airtight surface, there are a method for enclosing each floor of a house with its own airtight surface and a method for enclosing the entire house with an airtight surface. When the latter is adopted, there is an advantage that the area where the airtight construction method is applied is reduced, but it is difficult to ensure the airtightness of the beam portion between the floors, particularly the connection portion of the beam.
[0004]
Currently, there are a wet airtight method and a dry airtight method as methods for ensuring the airtightness of the beam portions provided between each floor of the house, for example, the first floor and the second floor. The wet airtight method is to ensure airtightness by spraying urethane or other resin on the beam connection, etc., but when urethane is sprayed, chlorine gas that is suspected of toxic gas is generated. In order to ensure the safety of the person, interior work etc. cannot be performed simultaneously. Moreover, the spraying of urethane cannot be performed by carpenters, and requires a special worker. For these reasons, the wet airtight method has a problem that the construction efficiency is poor. In addition, because of the foaming of urethane, chlorofluorocarbon gas is usually used, and there is a problem in terms of environment.
[0005]
On the other hand, the dry airtight construction method can solve the above-mentioned problem, but it is difficult to ensure airtightness because the connecting portions of the beams have complicated shapes. That is, as shown in FIG. 12, the C-shaped beam tether 2 having the connection end 6 abuts on the indoor side of the H-shaped outer peripheral beam 1 orthogonally, and the insertion hole provided in the connection end 6 As shown in FIG. 13, the outer peripheral heat insulating material 3 is arranged on the indoor side surface of the outer peripheral beam 1 in the connection portion A fixed by the bolt 16 inserted through the insertion hole provided in the outer peripheral beam 1 and An airtight sheet 4 made of foamed polyethylene or the like is brought into close contact therewith, and the airtight tape 24 is sealed in a gap formed between the end of the airtight sheet 4 and the connecting end 6 of the beam tether 2 while being bent; Airtightness was secured along the indoor side surface of the outer peripheral beam 1.
[0006]
[Problems to be solved by the invention]
However, according to such a conventional construction method, it is necessary to appropriately process the airtight sheet 4 at the site according to the shape of the connecting portion of the beam. However, since the shape of the connecting portion of the beam is complicated, the processing is not easy. . In addition, since the airtight tape 24 is attached while being bent in accordance with a complicated shape, distortion and gaps are likely to occur in the airtight tape 24, thereby causing a problem that sufficient airtightness cannot be ensured. Furthermore, since the outer peripheral beam 1 to which the beam tether 2 is connected is in contact with the outside air, when the temperature of the outside air is lower than the indoor temperature, the temperature of the beam tether 2 through the outer perimeter beam 1 may be low. is there. For this reason, there also exists a problem that dew condensation is easy to generate | occur | produce in the beam connection 2 which is in contact with the indoor comparatively warm and humid air.
[0007]
The present invention has been made in view of the above points, and in a heat-insulating and air-tight structure of a building such as a house, in particular, in a connecting portion between a linearly arranged outer peripheral beam and a beam connection perpendicular to the outer peripheral beam, Therefore, it is an object of the present invention to provide a heat-insulating and air-tight structure of a connecting portion of a beam that can ensure airtightness with certainty and prevent condensation.
[0008]
[Means for Solving the Problems]
Specific means for solving the above technical problems are as follows. That is, the heat-insulating and air-tight structure in the connecting portion of the beam according to claim 1 is a heat-insulating and air-tight structure in the connecting portion between the linearly arranged outer peripheral beam and the indoor-side beam joint orthogonal thereto. The indoor side surface of the outer peripheral heat insulating material is covered with an outer peripheral heat insulating material, and an air tight sheet is closely attached to the indoor side surface of the outer peripheral heat insulating material. An airtight cover provided with an end close contact surface that is in close contact with the end is brought into close contact, and conforms to the shape of the periphery of the beam joint around the beam joint up to a position a predetermined distance away from the connection portion to the indoor side. A heat-insulating part comprising a heat-insulating member, and an air-tight member integrally provided on the outer periphery of the heat-insulating part, the outdoor-side end portion having a cover contact surface that is in close contact with the indoor side surface of the air-tight cover, Indoor side edge The is characterized in that the heat insulating unit the are brought into close contact with the heat insulating airtight cover and a gas-tight portion having a beam connecting contact surface in close contact with the periphery of the beam tie indoors side of.
[0009]
The heat-insulating and air-tight structure in the connection portion of the beam according to claim 2 is the structure according to claim 1, wherein the beam joint has a cavity inside, and the beam joint adhesion surface of the heat-insulating and air-tight cover in the cavity portion. A heat-insulating and air-tight packing having a shape matching the cross-sectional shape of the hollow portion is fitted into the inner position of the hollow portion.
[0010]
According to a third aspect of the present invention, there is provided the heat insulating and airtight structure in the connecting portion of the beam. In the configuration according to the first or second aspect, the airtight cover has the outer peripheral contact surface formed in a planar shape, and the end contact surface is the surface. It is characterized by having a fitting groove that matches the shape of the connecting end of the beam tether.
[0011]
The heat-insulating and air-tight structure in the connecting portion of the beam according to claim 4 is the configuration described in any one of claims 1 to 3, wherein the heat-insulating and air-tight cover is configured such that the heat insulating portion has a shape around the beam connecting portion. An airtight surface having a contact surface of substantially the same shape and having a constant thickness, and the airtight portion covering and covering the periphery of the heat insulating portion, and an airtight cover formed perpendicular to the ambient airtight surface. It is characterized by having a flat cover adhering surface in close contact and a beam connecting adhering surface having substantially the same shape as the surrounding shape of the beam connecting on the indoor side from the heat insulating portion.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the heat insulation airtight structure in the connection part of the beam which concerns on this invention is demonstrated based on drawing. As shown in FIG. 1, the heat-insulating and air-tight structure in the connecting portion of the beam according to the first embodiment of the present invention is a connecting portion A between the outer peripheral beam 1 arranged linearly and the indoor beam connecting portion 2 orthogonal thereto. In which the indoor side surface of the outer peripheral beam 1 is covered with the outer peripheral heat insulating material 3, the air tight sheet 4 is covered with the indoor side surface of the outer peripheral heat insulating material 3, and the indoor portion of the airtight sheet 4 is covered with the connection portion A. An airtight cover 8 having an outer peripheral contact surface 5 that is in close contact with the side surface and an end contact surface 7 that is in close contact with the connection end 6 (see FIG. 3) of the beam tether 2 is brought into close contact, and a predetermined distance from the connection A to the indoor side. A heat insulating portion 9 (see FIG. 9) made of a heat insulating member that conforms to the shape of the periphery of the beam tether 2 up to a position separated by L, and integrally provided on the outer periphery of the heat insulating portion 9 An airtight member provided at the outdoor side end portion of the airtight cover. A cover contact surface 10 that is in close contact with the indoor side surface, and an airtight portion 12 that has a beam joint contact surface 11 that is in close contact with the periphery of the beam joint 2 on the indoor side from the heat insulating portion 9 at the indoor side end. A heat-insulating and air-tight packing 13 having a shape matching the cross-sectional shape of the cavity portion is fitted into the inner side of the beam-bonding contact surface 11 of the heat-insulating and air-tight cover 13 in the cavity portion of the beam tether 2. It is. This will be described in more detail below.
[0013]
FIG. 2 is a plan view showing the arrangement of beams provided between each floor of the house, for example, the first floor and the second floor, and the hatched portion in the figure is a portion where an airtight surface should be provided to ensure airtightness. Is shown. The connecting portion A in the figure connects the outer peripheral beam 1 arranged along the airtight surface and the beam tether 2 orthogonal thereto. In this connection portion A, as shown in FIG. 3, a C-shaped cross-section beam joint 2 having a connection end portion 6 is brought into contact with the indoor side surface of the H-shaped outer peripheral beam 1, and the connection end portion 6 is brought into contact with the connection end portion 6. It is configured to be fixed by a bolt 16 inserted through the provided insertion hole and the insertion hole provided in the web 15 of the outer circumferential beam 1. The connection end 6 of the beam tether 2 is a flat plate portion extending from the beam tether 2 and its outdoor side end is bent at a right angle so as to contact the web of the outer beam 1. . The outer peripheral beam 1 is disposed on the shaft set 17, and a heat insulating inner wall frame 18 is disposed on the indoor side of the shaft set 17.
[0014]
And as shown in FIG. 4, the indoor side surface is covered with a heat insulating material by arrange | positioning the outer peripheral heat insulating material 3 in the H-shaped groove | channel on the indoor side of the said outer periphery beam 1 without a clearance gap. As the outer peripheral heat insulating material 3, for example, a material in which a heat insulating material such as glass wool is packed in a bag formed in advance so as to match a space to be disposed can be used. The bag body is formed by a member having no gap such as a synthetic resin in order to prevent scattering of the heat insulating material. Further, a gap heat insulating material 19 is disposed without a gap in a space formed between the outer peripheral beam 1 and the heat insulating inner wall frame 18.
[0015]
Next, as shown in FIG. 5, the airtight sheet 4 is placed in close contact with the indoor side surface of the outer peripheral heat insulating material 3. At this time, the one side airtight sheet 4a disposed on the one side surface 6a side of the connecting end 6 of the beam tether 2 and the other side surface airtight sheet 4b disposed on the other side surface 6b side are arranged to overlap each other. Here, the overlapping end portion 4c of the one side surface airtight sheet 4a is arranged in a straight line along one side surface 6a of the connection end portion 6 of the beam tether 2, and the beam is connected to the overlapping end portion 4d of the other side surface airtight sheet 4b. A U-shaped notch 4e that matches the length of the connecting end 6 of the tether 2 in the vertical direction is formed, and the connecting end 6 is inserted into the notch 4e. It is configured to overlap with 4a. The upper end side 4f of the airtight sheet 4 is placed on the upper surface of the outer peripheral beam 1 and bent horizontally along the lower surface of the lightweight cellular concrete plate 25 constituting the floor foundation, and the lower end side is the gap heat insulating material 19 and the heat insulating inner wall. Affixed so as to cover the upper part of the frame 18. As the airtight sheet 4, for example, foamed polyethylene formed in a sheet shape can be used.
[0016]
Thereafter, as shown in FIG. 6, the airtight cover 8 is disposed in close contact with the connection portion A between the outer peripheral beam 1 and the beam tether 2. As shown in FIG. 7, the airtight cover 8 has an outer peripheral close contact surface 5 a that is in close contact with the indoor side surface of the one side airtight sheet 4 a and an end close contact that is in close contact with one side surface 6 a of the connection end 6 of the beam tether 2. A first airtight cover 8a having a surface 7a and an upper surface close contact surface 20 that is in close contact with the lower surface of the upper end side 4f of the airtight sheet 4 is formed symmetrically with respect to the first airtight cover 8a, and the other side airtight sheet 4b. The outer peripheral contact surface 5b that is in close contact with the indoor side surface, the end contact surface 7b that is in close contact with the other side surface 6b of the connection end 6 of the beam tether 2, and the upper surface contact surface 20 that is in close contact with the lower surface of the upper end side 4f of the airtight sheet 4. And a second hermetic cover 8b.
[0017]
The outer peripheral contact surfaces 5a and 5b of the first airtight cover 8a and the second airtight cover 8b are formed in a substantially rectangular planar shape covering the indoor side surface in the vicinity of the overlapping portion of the airtight sheet 4. The end close contact surfaces 7a and 7b have a planar shape that is perpendicular to the outer peripheral contact surfaces 5a and 5b, that is, parallel to both side surfaces 6a and 6b of the connection end 6 of the beam tether 2. In the vicinity of the central portion in the direction, a close contact surface having substantially the same shape as the outer peripheral shape of the connection end portion 6 in a state where the first airtight cover 8a and the second airtight cover 8b are coupled so as to match the shape of the connection end portion 6 is provided. Fitting grooves 21a and 21b are formed, respectively, so that the fitting grooves 21a and 21b can be fitted and brought into close contact with the one side surface 6a and the other side surface 6b of the connection end 6, respectively. It has become. The upper surface contact surface 20 is a planar portion provided at a right angle to the upper end portions of the outer periphery contact surfaces 5a and 5b and the end contact surfaces 7a and 7b, that is, parallel to the ground.
[0018]
Here, as the airtight cover 8, for example, a sheet-like polyethylene or polypropylene formed in a predetermined shape can be used. Although not shown, the outer peripheral contact surfaces 5a and 5b, the end close contact surfaces 7a and 7b, the fitting concave grooves 21a and 21b, and the upper close contact surface 20 in the first and second airtight covers 8a and 8b are preliminarily provided on both surfaces. An adhesive tape is provided, and can be easily adhered to the surfaces to be adhered to each other, so that airtightness can be ensured.
[0019]
Next, as shown in FIG. 1, a heat-insulating and airtight cover 13 is disposed in close contact with the beam tether 2 around the beam tether 2 at a predetermined distance L from the connecting portion A between the outer beam 1 and the beam tether 2 to the indoor side. To do. Here, as shown in FIG. 8, the heat insulating and airtight cover 13 includes a first heat insulating and airtight cover 13a that is in close contact with the beam tether 2 from the side surface 2a and a second heat and airtight cover 13b that is in close contact with the other side surface 2b. The first heat-insulating and air-tight cover 13a and the second heat-insulating and air-tight cover 13b are respectively a heat-insulating portion 9 made of a heat-insulating member that is in close contact with the beam tether 2 and an air-tight member that covers the outer periphery of the heat-insulating portion 9. The airtight part 12 which consists of.
[0020]
As shown in FIGS. 1 and 9, the heat insulating portion 9 has a contact surface that has substantially the same shape as the surrounding shape of the beam tether 2 in a state where the first heat insulating airtight cover 13 a and the second heat insulating airtight cover 13 b are coupled. A heat insulating member having a length covering the periphery of the beam tether 2 at a position a predetermined distance L from the connecting portion A to the indoor side. is there. The predetermined distance L is set to a distance sufficient to cover the portion that is lower than the indoor temperature through the outer peripheral beam 1 to prevent condensation, and is, for example, about 50 to 100 cm from the connection portion A. As the heat insulating member constituting the heat insulating portion 9, for example, a material in which a heat insulating material such as glass wool is packed in a bag formed in advance so as to match the shape of the heat insulating portion 9 can be used. The bag body is formed by a member having no gap such as a synthetic resin in order to prevent scattering of the heat insulating material.
[0021]
The airtight portion 12 is an airtight member integrally provided on the outer periphery of the heat insulating portion 9, and is disposed around the heat insulating portion 9 in a state where the first heat insulating airtight cover 13 a and the second heat insulating airtight cover 13 b are coupled. An ambient airtight surface 22 that tightly covers the cover, a cover adhesion surface 10 that is formed at an outdoor side end of the ambient airtight surface 22 and is in close contact with the airtight cover 8, and an indoor end of the ambient airtight surface 22; It is formed to have a beam connecting contact surface 11 that is in close contact with the periphery of the beam connecting 2 on the indoor side rather than the portion covered by the heat insulating portion 9. Here, the ambient airtight surface 22 is formed in a quadrangular prism shape that is substantially the same shape as the surrounding shape of the heat insulating portion 9, and a stepped portion that is in close contact with the indoor side end surface of the heat insulating portion 9 at the indoor side end portion thereof. 22a is formed and is integrally formed in close contact with the periphery of the heat insulating portion 9. The cover contact surface 10 is formed in a planar shape by extending a surface perpendicular to the ambient airtight surface 22 at the outer periphery of the outdoor side end of the ambient airtight surface 22. The beam connecting contact surface 11 is formed in a quadrangular prism shape substantially the same as the shape of the periphery of the beam connecting 2 perpendicular to the stepped portion 22a at the indoor side end of the surrounding airtight surface 22.
[0022]
Moreover, in this embodiment, as shown in FIG.8 and FIG.9, the airtight cover 8 is divided | segmented into two along the plane containing the other side surface 2b of the beam tether 2, and the 1st heat insulation airtight cover 13a and The second heat-insulating airtight cover 13b is formed, and the first heat-insulating airtight cover 13a is constituted by a substantially U-shaped section covering the upper surface 2c, the lower surface 2d and the one side surface 2a of the beam tether 2, and the second heat-insulating airtight cover 13b. Is formed of a substantially I-shaped section covering the other side 2 b of the beam tether 2. And the coupling | bond part 23 extended in the up-and-down direction was provided in the coupling | bond part of the 1st heat insulation airtight cover 13a and the 2nd heat insulation hermetic cover 13b, respectively, and by adhering in this coupling surface 23, it adheres. It is designed to be joined together while ensuring airtightness. Although not shown in the drawings, the first heat insulating airtight cover 13a and the second heat insulating airtight cover 13b have double-sided adhesive in advance on the close contact surface of the heat insulating portion 9, the cover close contact surface 10 of the air tight portion, the beam connecting close contact surface 11 and the connecting surface 23. A tape is provided, and can be easily brought into close contact with the surfaces to be brought into close contact with each other, so that airtightness can be secured. Thereby, the heat insulation airtight cover 13 can ensure the heat insulation of the circumference | surroundings of the beam tether 2 and the airtightness in the position which only the predetermined distance L left | separated from the connection part A to the indoor side.
[0023]
As shown in FIGS. 1, 8 and 10, a cross section of the cavity portion is provided at a position inside the beam joint close contact surface 11 of the heat-insulating hermetic cover 13 in the cavity portion of the beam joint 2 having a C-shaped cross section. The heat insulating airtight packing 14 having a shape matching the shape is inserted. The heat-insulating and air-tight packing 14 is a heat-insulating and air-tight member formed so as to have a cross-sectional shape substantially the same as the cross-sectional shape of the hollow portion in accordance with the shape of the hollow portion inside the beam tether 2. For example, a block obtained by molding a block having elasticity and airtightness such as foamed polyethylene into a predetermined shape can be used. Thereby, the air flow through the hollow portion inside the beam tether 2 can be blocked at the position inside the beam tether close contact surface 11 of the heat insulating airtight cover 13. Can be prevented from flowing in, so that dew condensation does not occur on the inner side surface on the outdoor side of the beam tether 2 that is at a relatively low temperature. The heat-insulating and air-tight packing 14 can be attached before the heat-insulating and air-tight cover 13 is attached, or afterwards. In this embodiment, the beam connection 2 has a C-shaped cross section. However, the present invention is not limited to this, and the cross-sectional shape of the beam connection 2 may be a square cross section, a circular cross section, a U-shaped cross section, an H-shaped cross section, etc. In the case of other cross-sectional shapes, the same structure can be obtained.
[0024]
In addition, the heat-insulating and air-tight structure in the beam connecting portion according to the second embodiment of the present invention is a structure in which the heat-insulating and air-tight packing 14 is not provided in the heat-insulating and air-tight structure in the beam connecting portion according to the first embodiment. Is. That is, FIG. 11 shows the case where the hollow portion of the beam connecting portion 2 is widely opened or has no hollow portion, such as when the cross-sectional shape of the beam connecting portion 2 is an H-shaped cross section or a U-shaped cross section. As described above, by making the shape of the close contact surface of the heat insulating portion 9 of the heat insulating airtight cover 13 close to the entire periphery of the beam tether 2, the structure without the heat insulating airtight packing 14 can be provided. . In the present embodiment, since the cross-sectional shape of the beam tether 2 is an H-shaped cross section, the shape of the close contact surface of the heat insulating portion 9 of the heat insulating airtight cover 13 is formed in an H shape corresponding thereto, They are placed in close contact. Thereby, indoor air can be prevented from flowing into the cavity surrounded by the heat insulating and airtight cover 13 as in the case where the heat insulating and airtight packing 14 is provided.
[0025]
【The invention's effect】
As described above, according to the heat-insulating and air-tight structure in the connecting portion of the beam according to claim 1 of the present invention, the indoor side surface of the outer peripheral beam is moved to the position away from the connecting portion by a predetermined distance from the connecting portion to the indoor side. In addition, the periphery of the beam joint is insulated by a heat insulating portion of a heat insulating airtight cover, and an airtight surface is formed on the indoor side of the heat insulating member by the airtight sheet, the airtight cover, and the airtight portion of the heat insulating airtight cover. It is possible to prevent dew condensation from occurring around the beam without touching the outdoor side portion of the outer peripheral beam and the beam joint which are cooled by the air to a low temperature without touching the indoor relatively warm and humid air. Further, by using the airtight cover and the heat insulating airtight cover, it is possible to easily and surely ensure airtightness by simply covering and covering the complicated shape of the connecting portion between the outer peripheral beam and the beam joint. .
[0026]
According to the heat-insulating and air-tight structure in the beam connecting portion according to claim 2 of the present invention, the cross-sectional shape of the cavity is formed at the inner position of the beam-bonding contact surface of the heat-insulating and air-tight cover in the cavity inside the beam tether. By inserting the matching heat-insulating and air-tight packing, it is possible to ensure heat insulation and air-tightness of the outdoor portion of the beam joint even when the beam joint has a cavity inside, and the above-mentioned claim 1 The effect similar to the heat insulation airtight structure in the connection part of such a beam can be acquired.
[0027]
According to the heat-insulating and air-tight structure in the beam connecting portion according to claim 3 of the present invention, in addition to the above-mentioned effects, the air-tight cover has the outer peripheral contact surface formed in a planar shape, and the end contact surface is the surface. By having a fitting groove that matches the shape of the connection end of the beam joint, it can be easily and reliably brought into close contact with the complicated shape of the connection portion between the outer peripheral beam and the beam joint. Therefore, airtightness can be reliably ensured by simple construction.
[0028]
According to the heat-insulating and air-tight structure of the beam connecting portion according to claim 4 of the present invention, in addition to the above-described effects, the heat-insulating and air-tight cover has a close contact with the heat insulating portion having substantially the same shape as the surrounding shape of the beam connecting portion. A planar air-tight surface that has a surface and is formed to have a certain thickness, and the air-tight portion covers and tightly covers the periphery of the heat-insulating portion, and a planar shape that is formed perpendicular to the surrounding air-tight surface and closely contacts the air-tight cover. By forming a cover contact surface and a beam connection contact surface having substantially the same shape as the shape of the beam connection on the indoor side from the heat insulating portion, a connection portion between the outer peripheral beam and the beam connection, and Since it can be easily and reliably brought into close contact with the complicated shape around the beam joint, it is possible to ensure heat insulation and air tightness with simple construction.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a heat insulating and airtight structure at a connecting portion of a beam according to an embodiment of the present invention.
FIG. 2 is a plan view showing the arrangement of beams provided between the floors of a house.
FIG. 3 is a perspective view showing a structure of a connection portion between an outer peripheral beam and a beam connecting portion.
FIG. 4 is a perspective view showing a state in which a heat insulating material is arranged at a connecting portion of the beam.
FIG. 5 is a perspective view showing a state in which an airtight sheet is arranged at a connecting portion of the beam.
FIG. 6 is a perspective view showing a state in which an airtight cover is arranged at a connecting portion of the beam.
FIG. 7 is a perspective view showing an airtight cover according to an embodiment of the present invention.
FIG. 8 is a perspective view showing a heat insulating and airtight cover according to the embodiment of the present invention.
FIG. 9 is a cross-sectional view showing a cross section of the heat-insulating and air-tight structure at the connecting portion of the beam cut at the heat-insulating portion of the heat-insulating and air-tight cover.
FIG. 10 is a cross-sectional view showing a cross section obtained by cutting the heat-insulating and air-tight structure at the connecting portion of the beam at the beam connecting and adhering portion of the heat-insulating and air-tight cover.
FIG. 11 is a cross-sectional view showing a heat-insulating and air-tight structure at a beam connecting portion according to a second embodiment of the present invention.
FIG. 12 is a perspective view showing a structure of a connecting portion between an outer peripheral beam and a beam joint according to a conventional example.
FIG. 13 is a perspective view showing a heat-insulating and air-tight structure at a beam connecting portion according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer peripheral beam 2 Beam connection 3 Outer peripheral heat insulating material 4 Airtight sheet 8 Airtight cover 9 Thermal insulation part 12 Airtight part 13 Thermal insulation airtight cover 14 Thermal insulation airtight packing A Connection part

Claims

A heat-insulating and air-tight structure at the connection portion between the linearly arranged outer peripheral beam and the indoor beam connection perpendicular to the outer peripheral beam,
Covering the indoor side surface of the outer peripheral beam with an outer peripheral heat insulating material,
Cover the indoor side surface of the outer peripheral insulating material with an airtight sheet in close contact,
Adhering to the connection part an airtight cover having an outer peripheral contact surface that is in close contact with the indoor side surface of the airtight sheet and an end contact surface that is in close contact with the connection end of the beam connection,
A heat insulating part made of a heat insulating member matching the shape of the periphery of the beam joint, and integrally provided on the outer periphery of the heat insulation part, around the beam joint at a predetermined distance from the connection part to the indoor side. An airtight member that has a cover contact surface that is in close contact with the indoor side surface of the airtight cover at the outdoor side end portion, and the indoor side end portion around the beam joint on the indoor side from the heat insulating portion. A heat-insulating and air-tight structure in a connecting portion of a beam, characterized in that a heat-insulating and air-tight cover having an air-tight portion having a beam connecting and contacting surface closely contacting with each other is adhered.

In the case where the beam tether has a cavity inside, a heat-insulating hermetic packing having a shape matching the cross-sectional shape of the cavity portion is fitted into a position inside the beam tether contact surface of the heat-insulating and air-tight cover in the cavity portion. The heat insulation airtight structure in the connection part of the beam of Claim 1.

The hermetic cover is characterized in that the outer peripheral contact surface is formed in a planar shape, and the end contact surface is formed with a fitting groove that matches the shape of the connection end of the beam tether. The heat insulation airtight structure in the connection part of the beam of Claim 1 or 2 to do.

The heat insulating and airtight cover is formed in such a manner that the heat insulating portion has a contact surface having substantially the same shape as the shape of the periphery of the beam joint and is formed to have a constant thickness, and the air tight portion covers the heat insulating portion in close contact with the surrounding area. An airtight surface, a flat cover adhering surface that is formed perpendicular to the surrounding airtight surface and is in close contact with the airtight cover, and a beam connecting contact that is substantially the same shape as the surrounding shape of the beam connecting on the indoor side from the heat insulating portion The heat insulating and airtight structure in the connection portion of the beam according to any one of claims 1 to 3, wherein the structure is formed with a surface.