JP3978067B2

JP3978067B2 - Unit building

Info

Publication number: JP3978067B2
Application number: JP2002106541A
Authority: JP
Inventors: 成一太田; 宏俊岡崎
Original assignee: Sekisui Chemical Co Ltd
Current assignee: Sekisui Chemical Co Ltd
Priority date: 2001-07-31
Filing date: 2002-04-09
Publication date: 2007-09-19
Anticipated expiration: 2022-04-09
Also published as: JP2003113645A

Description

【０００１】
【発明の属する技術分野】
本発明は、壁式建物ユニットからなるユニット建物に係り、特に下階に壁のない大きな空間をとれるようにしたユニット建物に関する。
【０００２】
【従来の技術】
一般に、ユニット建物を構成する壁式建物ユニットは、パネルからなる床及び壁を有し、床の所定の側辺部に壁を立設することにより上方や側方が開放された箱状に組立られている。
【０００３】
このような壁式建物ユニットからなるユニット建物においては、上階の建物ユニットの荷重を下階の建物ユニットの壁で支える構造になっているため、原則として、下階には上階の壁に対応して壁が配置されている必要があり、下階よりも上階が後退したいわゆるセットバック構造を構成することが困難であるとともに、下階に壁のない大きな空間をとることが困難であった。
【０００４】
そこで、本出願人は、壁式建物ユニットからなるユニット建物において、下階に壁のない大きな空間をとることができるとともにセットバック構造を容易に構成することができるユニット建物として、特開平8-311999号公報に記載の如く、方形の床の対向する２つの側辺部の一方に壁を立設し、他方の側辺部に壁を立設せずしてなる壁式建物ユニットを上記他方の側辺部を互いに内側にして並設し、両建物ユニットの上記壁間、かつ平面視で建物ユニットの内部に梁を掛け渡して支持し、この梁にて上階の建物ユニットの端部を支持するものを提案している。
【０００５】
【発明が解決しようとする課題】
従来技術では、下階の互いに並設された両建物ユニットの壁間、かつ平面視で建物ユニットの内部に梁を掛け渡すに際し、この梁の上面にて上階の建物ユニットの端部を支持するものであるから、この梁が下階の室内に大きく垂れ下がる。このため、下階の天井部に大きな垂れ壁を生じ、下階の居室の外観、居住性を損なう。
【０００６】
本発明の課題は、壁式建物ユニットからなるユニット建物において、下階の天井部に大きな垂れ壁を生ずることなく、下階に壁のない大きな空間をとることができるとともにセットバック構造を容易に構成することができるユニット建物を提供することにある。
【０００７】
【課題を解決するための手段】
請求項１の発明は、方形の床の対向する２つの側辺部の一方に壁を立設し、他方の側辺部に壁を立設せずしてなる壁式建物ユニットを上記他方の側辺部を互いに内側にして並設し、両建物ユニットの上記壁間、かつ平面視で建物ユニットの内部に梁を掛け渡して支持し、この梁にて上階の建物ユニットの端部を支持してなるユニット建物において、前記梁を逆Ｔ字形断面の鋼製梁とし、該梁の逆Ｔ字形断面の底板部にて上階の建物ユニットの端部を支持するに際し、前記建物ユニットの壁の内側の梁を支持する部位に、該梁の底板部の一側と他側のそれぞれに対応する２本の木質の支柱を並立し、２本の支柱の頭部のそれぞれに取付金物を被着し、両取付金物の側板と両支柱を貫通するボルトにより両取付金物を両支柱に固定し、２本の支柱の一側と他側に設けられる壁枠材を連結板により連結し、連結板のくぼみを設けた中央部を両取付金物の天板と梁の底板部の間に挟み込んで、前記梁の底板部が前記くぼみ内に位置するようにして、両取付金物の天板に梁の底板部をボルト締結してなるようにしたものである。
【０００８】
請求項２の発明は、請求項１の発明において更に、前記梁の逆Ｔ字形断面の底板部の一側にて上階の建物ユニットの端部を支持し、他側にて下屋屋根ユニット又はバルコニーユニットを支持するようにしたものである。
【００１０】
請求項３の発明は、請求項１又は２の発明において更に、前記梁の逆Ｔ字形断面の立板部に、上階の建物ユニットの床枠材を接合するようにしたものである。
【００１１】
請求項４の発明は、請求項２の発明において更に、前記梁の逆Ｔ字形断面の立板部に、上階の建物ユニットの床枠材と、下屋屋根ユニットの屋根枠材又はバルコニーユニットの床枠材を接合するようにしたものである。
【００１２】
請求項５の発明は、請求項１〜４のいずれかの発明において更に、前記梁の端部で、立板部の起点を該梁の長手方向で底板部の起点より後退させてなるようにしたものである。
【００１３】
請求項６の発明は、請求項１〜５のいずれかの発明において更に、前記梁の底板部の下面と、該梁の下側に設置される天井面材との間に断熱材を装填してなるようにしたものである。
【００１４】
請求項１の発明によれば下記(a) 〜 (c)の作用がある。
(a)下階の互いに並設された両建物ユニットの壁間、かつ平面視で建物ユニットの内部に梁を掛け渡すに際し、この梁を逆Ｔ字形断面の鋼製梁とし、この梁の逆Ｔ字形断面の底板部にて上階の建物ユニットの端部を支持するものとした。逆Ｔ字梁の底板部で上階の建物ユニットを支持するものであるから、この梁が下階の室内に大きく垂れ下がることがない。従って、下階の天井部に大きな垂れ壁を生ずることなく、下階の居室の外観、居住性を向上できる。
【００１５】
(b)下階の両建物ユニットの壁を立設していない側辺部を互いに内側にして並設し、上述(a)の梁にて上階の建物ユニットを支持したので、下階に壁のない大きな空間をとることが可能になるとともにセットバック構造を容易に構成することが可能になる。
(c) 上階の建物ユニットの荷重を下階の両建物ユニットの壁に設けた支柱に分散させることができ、下階の壁の耐力を向上できる。また、支柱に設けた取付金物に梁を締結することにより、壁と梁の接合強度を高めることができる。
【００１６】
請求項２の発明によれば下記(d)の作用がある。
(d)上述(a)の逆Ｔ字梁の底板部にて、下屋屋根ユニット又はバルコニーユニットを支持し、下階の両建物ユニットの上部で、上階の建物ユニットがセットバックした部位に、下屋屋根又はバルコニーを形成できる。
【００１８】
請求項３の発明によれば下記(e)の作用がある。
(e)上階の建物ユニットの端部を梁の底板部の一側にて支持したとき、梁の断面に左右非対称な鉛直荷重が作用することになるが、梁は上階の建物ユニットの床枠材に接合されていて倒れ止めされ、結果として鉛直荷重に対する本来の剛性を梁に確保できる。
【００１９】
請求項４の発明によれば下記(f)の作用がある。
(f)上階の建物ユニットの端部を梁の底板部の一側にて支持し、下屋屋根ユニット又はバルコニーユニットを梁の底板部の他側にて支持したとき、梁の断面に左右非対称な鉛直荷重が作用することになるが、梁は上階の建物ユニットの床枠材と、下屋屋根ユニットの屋根枠材又はバルコニーユニットの床枠材に接合されていて倒れ止めされ、結果として鉛直荷重に対する本来の剛性を梁に確保できる。
【００２０】
請求項５の発明によれば下記(g)の作用がある。
(g)下階の両建物ユニットの壁の上部で、梁の端部が載置される部分において、梁の立板部が底板部より建物内側に後退せしめられる。従って、下階の建物ユニットの壁の上部に設けられるシール材のための貼り代を、梁の立板部の前方にて底板部の一側から他側に連続するように設けることができる。これにより、上下階のユニット間防水の確実を図ることができる。
【００２１】
請求項６の発明によれば下記(h)の作用がある。
(h)梁の底板部の下面と、下階用天井面材との間に断熱材を装填した。従って、鋼製梁が冷橋となり下階室内の温熱環境を悪化させるのを防止できる。
【００２２】
【発明の実施の形態】
図１は第１実施形態のユニット建物を示す斜視図、図２はユニット建物を逆Ｔ字梁の中間部で切断して示す断面図、図３は下階の両建物ユニットに逆Ｔ字梁を掛け渡した状態を示し、（Ａ）は断面図、（Ｂ）は平面図、図４は逆Ｔ字梁の取付構造を示す要部断面図、図５は逆Ｔ字梁の取付金物を示す斜視図、図６は第２実施形態のユニット建物における上階の建物ユニットの床パネル設置過程を示す斜視図、図７は梁の端部への床パネルの取付構造を示し、（Ａ）は斜視図、（Ｂ）は断面図、図８は梁の中間部への床パネルの取付構造を示し、（Ａ）は斜視図、（Ｂ）は（Ａ）のＢ−Ｂ線に沿う矢視図、図９はバルコニーユニットの設置過程を示す斜視図、図１０は図９のＡ部を示し、（Ａ）は斜視図、（Ｂ）は断面図、図１１は図９のＢ部を示す断面図、図１２は梁の端部を示す斜視図、図１３は下階の建物ユニットの壁の上部へのシール材の貼り付け過程を示し、（Ａ）は壁上シートの取付けを示す斜視図、（Ｂ）は弾性シール材の取付けを示す斜視図、（Ｃ）は弾性シール材の重ね代を示す斜視図、図１４は梁の下面の断熱材を示す断面図である。
【００２３】
（第１実施形態）（図１〜図５）
図１〜図３において、１はユニット建物を構成する壁式建物ユニットで、この建物ユニット１は、方形の床２の隣り合う３つの側辺部、更に詳しくは１つの長辺部と２つの短辺部に壁３を立設して予め工場で組立られている。尚、床２及び壁３は、枠組に面材を張設してなるパネルからなっている（図示省略）。また、上階の建物ユニット１ｂは下階の建物ユニット１ａよりも長辺方向の寸法がＳａだけ短く設計されている。
【００２４】
そして、上記ユニット建物は、現地の建築現場において、下階の建物ユニット１ａ、１ａを壁を立設していない側辺部を内側にして並設し、これら建物ユニット１ａの対向する外側の壁３の上端間、かつ平面視で建物ユニット１ａの内部に梁４を掛け渡し、この梁４及び壁３にて上階の建物ユニット１ｂの端部を支持するように組立てられている。
【００２５】
上階の建物ユニット１ｂ、１ｂは下階の建物ユニット１ａと同様に壁を立設していない側辺部を内側にして下階の建物ユニット１ａ上に一端を合わせて設置され、上階の建物ユニット１ｂの他端が上記梁４上に位置されている。尚、下階の建物ユニット１ａ上における梁４よりも前端側の部分には下屋屋根ユニット５が設置され、上階の建物ユニット１ｂ上には屋根ユニットが設置される（図示省略）。
【００２６】
ここで、梁４は、図１〜図５に示す如く、底板部１１の中央に立板部１２を立ち上げてなる逆Ｔ字形断面の鋼製梁とし、底板部１１の立板部１２を挟む両側のうちの一側に上階の建物ユニット１ｂの端部（床枠組２０の下枠材２１）を載せて支持し、他側に下屋屋根ユニット５の端部（屋根枠組３０の下枠材３１）を載せて支持する。梁４の立板部１２を挟む両側に上述の如くに支持される上階の建物ユニット１ｂの床枠組２０と、下屋屋根ユニット５の屋根枠組３０は、梁４の立板部１２とそれらの床枠組２０、屋根枠組３０の枠材を貫通するボルト１３にナット１４を螺合することにて、該梁４の立板部１２に固定される。
【００２７】
また、下階の建物ユニット１ａ、１ａにあっては、梁４の端部を支持する壁３の部分に木質の支柱４１を立てている。本実施形態では、図４、図５に示す如く、各建物ユニット１ａの壁３に、梁４の端部で底板部１１の一側と他側のそれぞれに対応する２本の支柱４１、４１を並立し、各支柱４１の頭部に被着される、天板４２Ａと両側板４２ＢからなるＵ字状の取付金物４２を設け、各取付金物４２の天板４２Ａに突設したボルト４２Ｃに梁４の端部で底板部１１の立板部１２を挟む両側のそれぞれを挿入し、該ボルト４２Ｃにナット４２Ｄを螺合することにて、該取付金物４２に梁４を締結する。
【００２８】
尚、下階の建物ユニット１ａの壁３において、２本の並立する支柱４１、４１の頭部に被着された両取付金物４２にあっては、一方の取付金物４２の側板４２Ｂに添設される固定板４３に設けられるボルト４３Ａを両取付金物４２の側板４２Ｂと両支柱４１に貫通し、該ボルト４３Ａにナット４３Ｂを螺合することにて、両取付金物４２を両支柱４１に固定する。
【００２９】
また、下階の建物ユニット１ａの壁３において、２本の並立する支柱４１、４１の一側に設けられる壁枠組５０の上枠材５１と他側に設けられる壁枠組５０の上枠材５１とは、それらの上枠材５１に釘打ち固定される連結板４４により連結され、連結板４４の中央くぼみ部４４Ａは取付金物４２の天板４２Ａと梁４の底板部１１の間に挟み込まれる。
【００３０】
本実施形態によれば以下の作用がある。
▲１▼下階の互いに並設された両建物ユニット１ａ、１ａの壁間、かつ平面視で建物ユニット１ａの内部に梁４を掛け渡すに際し、この梁４を逆Ｔ字形断面の鋼製梁４とし、この梁４の逆Ｔ字形断面の底板部１１にて上階の建物ユニット１ｂの端部を支持するものとした。逆Ｔ字梁４の底板部１１で上階の建物ユニット１ｂを支持するものであるから、この梁４が下階の室内に大きく垂れ下がることがない。従って、下階の天井部に大きな垂れ壁を生ずることなく、下階の居室の外観、居住性を向上できる。
【００３１】
▲２▼下階の両建物ユニット１ａ、１ａの壁を立設していない側辺部を互いに内側にして並設し、上述▲１▼の梁４にて上階の建物ユニット１ｂを支持したので、下階に壁のない大きな空間をとることが可能になるとともにセットバック構造を容易に構成することが可能になる。
【００３２】
▲３▼上述▲１▼の逆Ｔ字梁４の底板部１１にて、下屋屋根ユニット５を支持し、下階の両建物ユニット１ａ、１ａの上部で、上階の建物ユニット１ｂがセットバックした部位に、下屋屋根を形成できる。
【００３３】
▲４▼上階の建物ユニット１ｂの荷重を下階の両建物ユニット１ａ、１ａの壁３に設けた支柱４１に分散させることができ、下階の壁３の耐力を向上できる。また、支柱４１に設けた取付金物４２に梁４を締結することにより、壁３と梁４の接合強度を高めることができる。
【００３４】
（第２実施形態）（図６〜図１４）
ユニット建物６０は、第１実施形態と同様に、下階の両建物ユニット１ａ、１ａの対向する壁３の上端間に梁４を掛け渡し、この梁４及び両建物ユニット１ａ、１ａの壁３にて上階の建物ユニット１ｂ、１ｂを支持し、両建物ユニット１ｂ、１ｂの上に屋根ユニットを設置している。
【００３５】
ユニット建物６０が第１実施形態と異なる点は、下階の建物ユニット１ａの上における梁４よりも前端側の部分にバルコニーユニット６を設置したことにある。
【００３６】
ユニット建物６０において、上階の建物ユニット１ｂとバルコニーユニット６は梁４に以下の如くに接合される。
【００３７】
(1)上階の建物ユニット１ｂの床枠組２０を梁４における底板部１１の一側に載置する（図６、図７）。床枠組２０は、端根太２０Ａ（床枠材）と側根太２０Ｂ（床枠材）と下枠材２１（土台）を有しており、端根太２０Ａと側根太２０Ｂの交差部の内側にホールダウン金物２２を側根太２０Ｂに釘打ち固定してある。床枠組２０は、下枠材２１に設けたガイド孔２１Ａを梁４のための取付金物４２のボルト４２Ｃに嵌め入れて据付けられる（図７（Ａ））。
【００３８】
(2)梁４の中間部で、立板部１２の一側に溶接したスチフナ１５に、建物ユニット１ｂの床枠組２０の側根太２０Ｂを共回り防止ボルト１６で固定する（図８）。共回り防止ボルト１６は、スチフナ１５の外縁に折曲げエッジ１６Ａを係止する状態で、スチフナ１５と側根太２０Ｂに挿通され、脚付座金１７、ナット１８で固定される（共回り防止ボルト１６の折曲げエッジ１６Ａがスチフナ１５に係止することでナット１８による締付時の共回りが防止される）。
【００３９】
(3)バルコニーユニット６の床枠組７０を梁４における底板部１１の他側に載置する（図９）。床枠組７０は、端根太７０Ａ（床枠材）と側根太７０Ｂ（床枠材）と下枠材７１（土台）を有する。
【００４０】
(4)梁４の端部で、図１０に示す如く、建物ユニット１ｂの床枠組２０の端根太２０Ａに添設してあるホールダウン金物２２、床枠組２０の端根太２０Ａ、梁４の立板部１２、バルコニーユニット６０の端根太７０Ａを貫通するボルト７２にナット７３を螺合する。これにより、梁４の立板部１２に、建物ユニット１ｂの床枠組２０の端根太２０Ａとバルコニーユニット６の床枠組７０の端根太７０Ａを接合する。
【００４１】
(5)梁４の中間部で、図１１に示す如く、建物ユニット１ｂの床枠組２０の端根太２０Ａ、梁４の立板部１２、バルコニーユニット６０の端根太７０Ａを貫通するボルト７４にナット７５を螺合する。これにより、梁４の立板部１２に、建物ユニット１ｂの床枠組２０の端根太２０Ａとバルコニーユニット６の床枠組７０の端根太７０Ａを接合する。
【００４２】
次に、ユニット建物６０にあっては、下階の建物ユニット１ａの壁３の上部に設けられる梁４の端部で、図１２に示す如く、立板部１２の起点を該梁４の長手方向で底板部１１の起点より後退させている（後退長Ｌ）。尚、立板部１２の後退端面１２Ａは斜面をなす。梁４における底板部１１の後退長Ｌに対応する部分は、下階の建物ユニット１ａの壁３の上部に設けられる壁上シート８１、弾性シール材８２の貼り代となる。従って、壁上シート８１、弾性シール材８２は以下の如くに設けられる。尚、壁上シート８１はブチルシート、弾性シール材８２はウレタン発泡体を用いることができる。
【００４３】
(1)建物ユニット１ａの壁３の上部で、梁４の設置部を挟む両側には、工場生産段階で壁上シート８１、弾性シール材８２が設けられる。
【００４４】
(2)建物ユニット１ａの壁３の上部で、梁４の設置部の前面に、壁上シート８１の下粘着層を貼り、壁上シート８１の上粘着層の上に弾性シール材８２を貼る（図１３（Ａ）、（Ｂ））。壁上シート８１は、上述(1)の工場生産段階で設けられている両側の壁上シート８１に重ね貼りされる（図１３（Ｂ））。弾性シール材８２も、上述(1)の工場生産段階で設けられている両側の弾性シール材８２に重ね代８２Ａをもって貼り設けられる（図１３（Ｃ））。
【００４５】
従って、上階の建物ユニット１ｂの床枠組２０は、梁４の一側で、下階の建物ユニット１ａの壁３の上部に上述(1)、(2)の弾性シール材８２を介して据付けられる。また、バルコニーユニット６の床枠組７０は、梁４の他側で、下階の建物ユニット１ａの壁３の上部に上述(1)、(2)の弾性シール材８２を介して据付けられる。これにより、上下階の建物ユニット１ａ、１ｂの防水性、下階の建物ユニット１ａとバルコニーユニット６の防水性を確保できる。
【００４６】
また、ユニット建物６０にあっては、図１４に示す如く、下階の建物ユニット１ａの天井を以下の如くに形成する。
【００４７】
(1)上階の建物ユニット１ｂの床枠組２０とバルコニーユニット６の床枠組７０に野縁受９１を固定し、野縁受９１に野縁９２を固定する。
【００４８】
(2)梁４の底板部１１の下面にグラスウール等の断熱材９３を装填するとともに、床枠組２０、７０の根太間にグラスウール等の断熱材９４を装填する。
【００４９】
(3)野縁９２に石膏ボード等の天井面材９５を取付ける。これにより、梁４の底板部１１の下面と、梁４の下側に設置される天井面材９５との間に断熱材９３が装填される。
【００５０】
本実施形態によれば以下の作用がある。
▲１▼上階の建物ユニット１ｂの端部を梁４の底板部１１の一側にて支持したとき、梁４の断面に左右非対称な鉛直荷重が作用することになるが、梁４は上階の建物ユニット１ｂの端根太２０Ａ（床枠材）に接合されていて倒れ止めされ、結果として鉛直荷重に対する本来の剛性を梁４に確保できる。
【００５１】
▲２▼上階の建物ユニット１ｂの端部を梁４の底板部１１の一側にて支持し、バルコニーユニット６を梁４の底板部１１の他側にて支持したとき、梁４の断面に左右非対称な鉛直荷重が作用することになるが、梁４は上階の建物ユニット１ｂの端根太２０Ａ（床枠材）と、バルコニーユニット６の端根太７０Ａ（床枠材）に接合されていて倒れ止めされ、結果として鉛直荷重に対する本来の剛性を梁４に確保できる。
【００５２】
▲３▼下階の両建物ユニット１ａの壁３の上部で、梁４の端部が載置される部分において、梁４の立板部１２が底板部１１より建物内側に後退せしめられる。従って、下階の建物ユニット１ａの壁３の上部に設けられるシール材８２のための貼り代を、梁４の立板部１２の前方にて底板部１１の一側から他側に連続するように設けることができる。これにより、上下階のユニット間防水の確実を図ることができる。
【００５３】
▲４▼梁４の底板部１１の下面と、下階用天井面材９５との間に断熱材９３を装填した。従って、鋼製梁４が冷橋となり下階室内の温熱環境を悪化させるのを防止できる。
【００５４】
以上、本発明の実施の形態を図面により詳述したが、本発明の具体的な構成はこの実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計の変更等があっても本発明に含まれる。
【００５５】
【発明の効果】
以上のように本発明によれば、壁式建物ユニットからなるユニット建物において、下階の天井部に大きな垂れ壁を生ずることなく、下階に壁のない大きな空間をとることができるとともにセットバック構造を容易に構成することができるユニット建物を得ることができる。
【図面の簡単な説明】
【図１】図１は図１は第１実施形態のユニット建物を示す斜視図である。
【図２】図２はユニット建物を逆Ｔ字梁の中間部で切断して示す断面図である。
【図３】図３は下階の両建物ユニットに逆Ｔ字梁を掛け渡した状態を示し、（Ａ）は断面図、（Ｂ）は平面図である。
【図４】図４は逆Ｔ字梁の取付構造を示す要部断面図である。
【図５】図５は逆Ｔ字梁の取付金物を示す斜視図である。
【図６】図６は第２実施形態のユニット建物における上階の建物ユニットの床パネル設置過程を示す斜視図である。
【図７】図７は梁の端部への床パネルの取付構造を示し、（Ａ）は斜視図、（Ｂ）は断面図である。
【図８】図８は梁の中間部への床パネルの取付構造を示し、（Ａ）は斜視図、（Ｂ）は（Ａ）のＢ−Ｂ線に沿う矢視図である。
【図９】図９はバルコニーユニットの設置過程を示す斜視図である。
【図１０】図１０は図９のＡ部を示し、（Ａ）は斜視図、（Ｂ）は断面図である。
【図１１】図１１は図９のＢ部を示す断面図である。
【図１２】図１２は梁の端部を示す斜視図である。
【図１３】図１３は下階の建物ユニットの壁の上部へのシール材の貼り付け過程を示し、（Ａ）は壁上シートの取付けを示す斜視図、（Ｂ）は弾性シール材の取付けを示す斜視図、（Ｃ）は弾性シール材の重ね代を示す斜視図である。
【図１４】図１４は梁の下面の断熱材を示す断面図である。
【符号の説明】
１ａ下階の建物ユニット
１ｂ上階の建物ユニット
２床
３壁
４梁
５下屋屋根ユニット
６バルコニーユニット
１１底板部
１２立板部
２０床枠組
２０Ａ梁根太（床枠材）
４１支柱
４２取付金物
６０ユニット建物
７０床枠組
７０Ａ端根太（床枠材）
９３断熱材
９５天井面材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a unit building composed of a wall-type building unit, and more particularly to a unit building that can take a large space without walls on a lower floor.
[0002]
[Prior art]
In general, a wall-type building unit that constitutes a unit building has a floor and walls made of panels, and is assembled in a box shape with the top and sides open by standing the wall on a predetermined side of the floor. It has been.
[0003]
In a unit building consisting of such wall-type building units, the structure of the building unit on the upper floor is supported by the wall of the building unit on the lower floor. Correspondingly, there is a need for walls to be arranged, and it is difficult to construct a so-called setback structure in which the upper floor is retreated from the lower floor, and it is difficult to take a large space without walls on the lower floor. there were.
[0004]
In view of this, the present applicant has proposed a unit building comprising a wall-type building unit as a unit building which can take a large space without a wall on the lower floor and can easily constitute a setback structure. As described in Japanese Patent No. 311999, a wall-type building unit in which a wall is erected on one of two opposing sides of a square floor and no wall is erected on the other side is The side parts of the building units are lined up side by side and supported between the walls of the two building units by spanning a beam across the building unit in plan view. We are proposing something that supports
[0005]
[Problems to be solved by the invention]
In the prior art, when the beam is spanned between the walls of the two building units arranged side by side on the lower floor and inside the building unit in plan view, the end of the upper floor building unit is supported by the upper surface of the beam. This beam drastically hangs down into the room on the lower floor. For this reason, a large drooping wall is produced in the ceiling part of the lower floor, and the appearance and the habitability of the lower floor living room are impaired.
[0006]
It is an object of the present invention to provide a set-back structure in a unit building composed of a wall-type building unit, which can take a large space without a wall on the lower floor without forming a large hanging wall on the ceiling of the lower floor. It is to provide a unit building that can be configured.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a wall-type building unit in which a wall is erected on one of two opposing side portions of a square floor and a wall is not erected on the other side portion. The side parts are arranged side by side in parallel, and a beam is supported between the above walls of both building units and inside the building unit in plan view. The end of the building unit on the upper floor is supported by this beam. In the supporting unit building, the beam is a steel beam having an inverted T-shaped cross section, and the end of the building unit on the upper floor is supported by the bottom plate portion of the inverted T-shaped cross section of the beam. Two wooden columns corresponding to each of one side and the other side of the bottom plate portion of the beam are juxtaposed on the portion supporting the beam on the inner side of the wall , and mounting hardware is attached to each of the heads of the two columns. The two mounting brackets are fixed to both columns with bolts that pass through the side plates of both mounting brackets and both columns. The wall frame member provided on one side and the other side connected by a connecting plate, Nde write sandwiching the central portion provided with a recess in the connecting plate between the bottom plate portion of the top plate and the beams of the two mounting fittings, the bottom plate of the beam The bottom plate portion of the beam is bolted to the top plate of both mounting hardware so that the portion is positioned in the recess .
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, the end of the upper floor building unit is supported on one side of the bottom plate portion of the inverted T-shaped cross section of the beam, and the lower roof unit on the other side. Alternatively, the balcony unit is supported.
[0010]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the floor frame material of the upper floor building unit is joined to the upright plate portion of the inverted T-shaped cross section of the beam.
[0011]
According to a fourth aspect of the present invention, in the second aspect of the present invention, a floor frame material of a building unit on an upper floor and a roof frame material or a balcony unit of a lower roof unit are provided on the upright plate portion of the inverted T-shaped cross section of the beam. The floor frame material is joined.
[0012]
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, at the end of the beam, the starting point of the upright plate portion is made to recede from the starting point of the bottom plate portion in the longitudinal direction of the beam. It is a thing.
[0013]
According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, a heat insulating material is loaded between a lower surface of the bottom plate portion of the beam and a ceiling surface material installed on the lower side of the beam. It was made to become.
[0014]
According to the invention of claim 1, the following actions (a) to (c) are obtained.
(a) When laying a beam between the walls of two building units arranged side by side on the lower floor and inside the building unit in plan view, this beam is a steel beam with an inverted T-shaped cross section, and The end portion of the building unit on the upper floor is supported by the bottom plate portion having a T-shaped cross section. Since the building unit on the upper floor is supported by the bottom plate portion of the inverted T-shaped beam, the beam does not drastically hang down into the room on the lower floor. Therefore, it is possible to improve the appearance and comfortability of the lower-floor living room without generating a large hanging wall on the ceiling of the lower floor.
[0015]
(b) The lower floors of the building units are arranged side by side with the walls not standing upright, and the upper floor building units are supported by the beams in (a) above. It becomes possible to take a large space without a wall and to easily configure the setback structure.
(c) The load of the building unit on the upper floor can be distributed to the columns provided on the walls of both building units on the lower floor, and the strength of the wall on the lower floor can be improved. Moreover, the joint strength of a wall and a beam can be raised by fastening a beam to the attachment metal provided in the support | pillar.
[0016]
The invention according to claim 2 has the following action (d) .
(d) At the bottom plate part of the inverted T-shaped beam described in (a ) above, the lower roof unit or balcony unit is supported, and the upper floor building unit is set back at the upper part of both lower building units. Can form a roof or balcony.
[0018]
The invention according to claim 3 has the following effect (e) .
(e) When the end of the upper floor building unit is supported on one side of the bottom plate of the beam, an asymmetrical vertical load acts on the cross section of the beam. It is joined to the floor frame material and prevented from falling down, and as a result, the original rigidity against vertical load can be secured in the beam.
[0019]
The invention of claim 4 has the following effect (f) .
(f) When the end of a building unit on the upper floor is supported on one side of the bottom plate of the beam and the roof roof unit or balcony unit is supported on the other side of the bottom plate of the beam, Asymmetrical vertical load will be applied, but the beam is joined to the floor frame material of the building unit on the upper floor and the roof frame material of the lower roof unit or the floor frame material of the balcony unit, and is prevented from falling down. As a result, the beam can have the original rigidity against the vertical load.
[0020]
The invention according to claim 5 has the following effect (g) .
(g) At the upper part of the walls of both building units on the lower floor, in the part where the end of the beam is placed, the standing plate part of the beam is retracted from the bottom plate part to the inside of the building. Therefore, the pasting allowance for the sealing material provided on the upper part of the wall of the building unit on the lower floor can be provided so as to be continuous from one side of the bottom plate portion to the other side in front of the standing plate portion of the beam. Thereby, the waterproofing between the units on the upper and lower floors can be ensured.
[0021]
The invention according to claim 6 has the following action (h) .
(h) A heat insulating material was loaded between the lower surface of the bottom plate portion of the beam and the ceiling material for the lower floor. Therefore, it is possible to prevent the steel beam from becoming a cold bridge and deteriorating the thermal environment in the lower floor room.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view showing a unit building according to the first embodiment, FIG. 2 is a cross-sectional view showing the unit building cut at an intermediate portion of an inverted T-shaped beam, and FIG. 3 is an inverted T-shaped beam for both building units on the lower floor. , (A) is a cross-sectional view, (B) is a plan view, FIG. 4 is a cross-sectional view of the main part showing an inverted T-shaped beam mounting structure, and FIG. 5 is an inverted T-shaped beam mounting hardware. FIG. 6 is a perspective view showing a floor panel installation process of a building unit on the upper floor in the unit building of the second embodiment, and FIG. 7 shows a mounting structure of the floor panel to the end of the beam. Is a perspective view, (B) is a cross-sectional view, FIG. 8 shows a floor panel mounting structure to the middle part of the beam, (A) is a perspective view, and (B) is an arrow along the line BB in (A). FIG. 9 is a perspective view showing the installation process of the balcony unit, FIG. 10 is a section A of FIG. 9, (A) is a perspective view, (B) is a sectional view, and FIG. 11 is a section B of FIG. FIG. 12 is a perspective view showing the end portion of the beam, FIG. 13 shows the process of attaching the sealing material to the upper part of the wall of the building unit on the lower floor, and (A) shows the attachment of the sheet on the wall. (B) is a perspective view showing attachment of an elastic seal material, (C) is a perspective view showing an overlap margin of the elastic seal material, and FIG. 14 is a cross-sectional view showing a heat insulating material on the lower surface of the beam.
[0023]
First Embodiment (FIGS. 1 to 5)
1 to 3, reference numeral 1 denotes a wall-type building unit that constitutes a unit building. This building unit 1 includes three adjacent side portions of a rectangular floor 2, more specifically, one long side portion and two side portions. The wall 3 is erected on the short side and assembled in advance at the factory. In addition, the floor 2 and the wall 3 are made up of panels in which face materials are stretched on a frame (not shown). Further, the upper floor building unit 1b is designed to be shorter in dimension in the long side direction by Sa than the lower floor building unit 1a.
[0024]
And the said unit building arrange | positions the lower floor building units 1a and 1a side by side with the side part which does not stand up the wall inside, and the outer wall which these building units 1a oppose in the local construction site The beam 4 is spanned between the upper ends of 3 and the interior of the building unit 1a in plan view, and the beam 4 and the wall 3 are assembled so as to support the end of the building unit 1b on the upper floor.
[0025]
The building units 1b and 1b on the upper floor are installed on the lower floor building unit 1a with one end aligned with the side portion where no wall is erected in the same manner as the building unit 1a on the lower floor. The other end of the building unit 1b is positioned on the beam 4. A lower roof unit 5 is installed on the lower floor building unit 1a on the front end side of the beam 4, and a roof unit is installed on the upper floor building unit 1b (not shown).
[0026]
Here, as shown in FIGS. 1 to 5, the beam 4 is a steel beam having an inverted T-shaped cross section in which a standing plate portion 12 is raised at the center of the bottom plate portion 11, and the standing plate portion 12 of the bottom plate portion 11 is The end of the building unit 1b on the upper floor (the lower frame material 21 of the floor frame assembly 20) is placed and supported on one side of the both sides sandwiched, and the end of the lower roof unit 5 (below the roof frame 30 on the other side) A frame member 31) is placed and supported. The floor frame 20 of the upper building unit 1b and the roof frame 30 of the lower roof unit 5 that are supported as described above on both sides of the vertical plate 12 of the beam 4 are the vertical plate 12 of the beam 4 and those The nuts 14 are screwed onto the bolts 13 penetrating the frame members of the floor frame 20 and the roof frame 30, thereby being fixed to the standing plate portion 12 of the beam 4.
[0027]
Further, in the building units 1a and 1a on the lower floor, a wooden support column 41 is erected on the portion of the wall 3 that supports the end of the beam 4. In this embodiment, as shown in FIGS. 4 and 5, two columns 41, 41 corresponding to the one side and the other side of the bottom plate portion 11 at the end of the beam 4 on the wall 3 of each building unit 1 a. Are arranged on the head of each support column 41 and provided with a U-shaped mounting hardware 42 composed of a top plate 42A and both side plates 42B, and a bolt 42C protruding from the top plate 42A of each mounting hardware 42. The beam 4 is fastened to the mounting hardware 42 by inserting each of both sides of the bottom plate portion 11 sandwiching the upright plate portion 12 at the end of the beam 4 and screwing the nut 42D to the bolt 42C.
[0028]
In addition, in the wall 3 of the building unit 1a on the lower floor, in the case of both mounting hardware 42 attached to the heads of two side-by-side support columns 41, 41, it is attached to the side plate 42B of one mounting hardware 42. Bolts 43A provided on the fixed plate 43 to be passed through the side plates 42B and the two columns 41 of both mounting hardware 42, and the nuts 43B are screwed into the bolts 43A, thereby fixing the mounting hardware 42 to the both columns 41. To do.
[0029]
Further, in the wall 3 of the building unit 1a on the lower floor, the upper frame material 51 of the wall frame assembly 50 provided on one side of the two side-by-side support columns 41, 41 and the upper frame material 51 of the wall frame assembly 50 provided on the other side. Are connected by a connecting plate 44 that is nail-fixed to the upper frame member 51, and the central recess 44 A of the connecting plate 44 is sandwiched between the top plate 42 A of the mounting hardware 42 and the bottom plate portion 11 of the beam 4. .
[0030]
According to this embodiment, there are the following operations.
(1) When the beam 4 is bridged between the walls of the two building units 1a and 1a arranged in parallel on the lower floor and inside the building unit 1a in plan view, the beam 4 is a steel beam having an inverted T-shaped cross section. 4 and the end portion of the building unit 1b on the upper floor is supported by the bottom plate portion 11 having an inverted T-shaped cross section of the beam 4. Since the upper floor building unit 1b is supported by the bottom plate portion 11 of the inverted T-shaped beam 4, the beam 4 does not drastically drop into the lower floor room. Therefore, it is possible to improve the appearance and comfortability of the lower-floor living room without generating a large hanging wall on the ceiling of the lower floor.
[0031]
(2) The lower floors of the building units 1a, 1a are juxtaposed with the side portions where the walls are not erected inside each other, and the building unit 1b on the upper floor is supported by the beam 4 of the above (1). Therefore, it is possible to take a large space without walls on the lower floor and to easily configure the setback structure.
[0032]
(3) At the bottom plate part 11 of the inverted T-shaped beam 4 in (1) above, the lower roof unit 5 is supported, and the upper floor building unit 1b is set above the lower building units 1a and 1a. A lower roof can be formed in the backed area.
[0033]
(4) The load of the building unit 1b on the upper floor can be distributed to the columns 41 provided on the walls 3 of both building units 1a and 1a on the lower floor, and the strength of the wall 3 on the lower floor can be improved. Further, by fastening the beam 4 to the mounting hardware 42 provided on the support column 41, the bonding strength between the wall 3 and the beam 4 can be increased.
[0034]
Second Embodiment (FIGS. 6 to 14)
As in the first embodiment, the unit building 60 spans the beam 4 between the upper ends of the opposing walls 3 of the building units 1a and 1a on the lower floor, and the walls 4 of the beams 4 and the building units 1a and 1a. The building units 1b and 1b on the upper floor are supported by and a roof unit is installed on both building units 1b and 1b.
[0035]
The unit building 60 is different from the first embodiment in that the balcony unit 6 is installed in a part on the front end side of the beam 4 on the building unit 1a on the lower floor.
[0036]
In the unit building 60, the building unit 1b on the upper floor and the balcony unit 6 are joined to the beam 4 as follows.
[0037]
(1) The floor frame 20 of the building unit 1b on the upper floor is placed on one side of the bottom plate portion 11 in the beam 4 (FIGS. 6 and 7). The floor frame assembly 20 has an end joist 20A (floor frame member), a side joist 20B (floor frame member), and a lower frame member 21 (base), and a hole is formed inside the intersection of the end joist 20A and the side joist 20B. The down hardware 22 is nail-fixed to the side joist 20B. The floor frame assembly 20 is installed by fitting the guide holes 21A provided in the lower frame member 21 into the bolts 42C of the mounting hardware 42 for the beam 4 (FIG. 7A).
[0038]
(2) The side joists 20B of the floor frame assembly 20 of the building unit 1b are fixed to the stiffener 15 welded to one side of the upright plate portion 12 at the intermediate portion of the beam 4 with the common rotation prevention bolt 16 (FIG. 8). The co-rotation prevention bolt 16 is inserted into the stiffener 15 and the side joist 20B in a state where the bent edge 16A is locked to the outer edge of the stiffener 15, and is fixed by the leg washer 17 and the nut 18 (the co-rotation prevention bolt 16). The bent edge 16A is locked to the stiffener 15 to prevent co-rotation when tightening with the nut 18).
[0039]
(3) The floor frame assembly 70 of the balcony unit 6 is placed on the other side of the bottom plate portion 11 of the beam 4 (FIG. 9). The floor frame assembly 70 includes an end joist 70A (floor frame material), a side joist 70B (floor frame material), and a lower frame material 71 (base).
[0040]
(4) At the end of the beam 4, as shown in FIG. 10, the hole-down hardware 22 attached to the end joist 20A of the floor frame 20 of the building unit 1b, the end joist 20A of the floor frame 20, and the standing of the beam 4 A nut 73 is screwed into a bolt 72 that passes through the plate section 12 and the end joist 70 </ b> A of the balcony unit 60. Accordingly, the end joist 20A of the floor frame assembly 20 of the building unit 1b and the end joist 70A of the floor frame assembly 70 of the balcony unit 6 are joined to the standing plate portion 12 of the beam 4.
[0041]
(5) At the middle part of the beam 4, as shown in FIG. 11, the nut 74 is attached to the bolt 74 passing through the end joist 20A of the floor frame 20 of the building unit 1b, the standing plate part 12 of the beam 4, and the end joist 70A of the balcony unit 60. 75 is screwed. Accordingly, the end joist 20A of the floor frame assembly 20 of the building unit 1b and the end joist 70A of the floor frame assembly 70 of the balcony unit 6 are joined to the standing plate portion 12 of the beam 4.
[0042]
Next, in the unit building 60, at the end portion of the beam 4 provided on the upper portion of the wall 3 of the building unit 1a on the lower floor, as shown in FIG. It is made to retreat from the starting point of the bottom plate part 11 in the direction (retraction length L). The receding end surface 12A of the upright plate portion 12 forms a slope. A portion of the beam 4 corresponding to the receding length L of the bottom plate portion 11 serves as an allowance for the upper wall sheet 81 and the elastic sealing material 82 provided on the upper portion of the wall 3 of the building unit 1a on the lower floor. Therefore, the on-wall sheet 81 and the elastic sealing material 82 are provided as follows. The on-wall sheet 81 can be a butyl sheet, and the elastic sealing material 82 can be a urethane foam.
[0043]
(1) On the upper part of the wall 3 of the building unit 1a and on both sides of the installation part of the beam 4, an on-wall sheet 81 and an elastic sealing material 82 are provided at the factory production stage.
[0044]
(2) At the upper part of the wall 3 of the building unit 1a, a lower adhesive layer on the wall sheet 81 is pasted on the front surface of the installation part of the beam 4, and an elastic sealing material 82 is pasted on the upper adhesive layer on the wall sheet 81. (FIGS. 13A and 13B). The wall sheet 81 is overlaid on the wall sheet 81 on both sides provided in the factory production stage (1) (FIG. 13B). The elastic sealing material 82 is also attached to the elastic sealing material 82 on both sides provided at the factory production stage (1) with an overlap margin 82A (FIG. 13C).
[0045]
Accordingly, the floor frame 20 of the upper floor building unit 1b is installed on one side of the beam 4 on the upper portion of the wall 3 of the lower floor building unit 1a via the elastic sealing material 82 described in (1) and (2) above. It is done. Further, the floor frame assembly 70 of the balcony unit 6 is installed on the other side of the beam 4 on the upper part of the wall 3 of the building unit 1a on the lower floor via the elastic sealing material 82 described in (1) and (2) above. Thereby, the waterproof property of the building units 1a and 1b on the upper and lower floors and the waterproof property of the building unit 1a and the balcony unit 6 on the lower floor can be secured.
[0046]
In the unit building 60, as shown in FIG. 14, the ceiling of the building unit 1a on the lower floor is formed as follows.
[0047]
(1) The field edge receiver 91 is fixed to the floor frame assembly 20 of the building unit 1 b on the upper floor and the floor frame assembly 70 of the balcony unit 6, and the field edge 92 is fixed to the field edge receiver 91.
[0048]
(2) A heat insulating material 93 such as glass wool is loaded on the lower surface of the bottom plate portion 11 of the beam 4, and a heat insulating material 94 such as glass wool is loaded between the joists of the floor frames 20 and 70.
[0049]
(3) A ceiling surface material 95 such as a plaster board is attached to the field edge 92. Thus, the heat insulating material 93 is loaded between the lower surface of the bottom plate portion 11 of the beam 4 and the ceiling surface material 95 installed on the lower side of the beam 4.
[0050]
According to this embodiment, there are the following operations.
(1) When the end of the building unit 1b on the upper floor is supported on one side of the bottom plate 11 of the beam 4, an asymmetrical vertical load acts on the cross section of the beam 4, but the beam 4 is It is joined to the end joist 20A (floor frame material) of the building unit 1b on the floor and is prevented from falling down. As a result, the beam 4 can have the original rigidity against the vertical load.
[0051]
(2) When the end of the building unit 1b on the upper floor is supported on one side of the bottom plate 11 of the beam 4 and the balcony unit 6 is supported on the other side of the bottom plate 11 of the beam 4, the cross section of the beam 4 The beam 4 is joined to the end joist 20A (floor frame member) of the upper floor building unit 1b and the end joist 70A (floor frame member) of the balcony unit 6. As a result, the beam 4 can have the original rigidity against the vertical load.
[0052]
(3) At the upper part of the wall 3 of both building units 1a on the lower floor, the standing plate portion 12 of the beam 4 is retracted from the bottom plate portion 11 to the inside of the building at the portion where the end portion of the beam 4 is placed. Therefore, the pasting allowance for the sealing material 82 provided on the upper part of the wall 3 of the building unit 1a on the lower floor is continued from one side of the bottom plate portion 11 to the other side in front of the standing plate portion 12 of the beam 4. Can be provided. Thereby, the waterproofing between the units on the upper and lower floors can be ensured.
[0053]
(4) A heat insulating material 93 was loaded between the lower surface of the bottom plate portion 11 of the beam 4 and the ceiling material 95 for the lower floor. Accordingly, it is possible to prevent the steel beam 4 from becoming a cold bridge and deteriorating the thermal environment in the lower floor room.
[0054]
Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention.
[0055]
【The invention's effect】
As described above, according to the present invention, in a unit building composed of a wall-type building unit, a large space without a wall can be formed on the lower floor without causing a large hanging wall on the ceiling of the lower floor, and a setback A unit building whose structure can be easily configured can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a unit building according to a first embodiment.
FIG. 2 is a cross-sectional view showing a unit building cut along an intermediate portion of an inverted T-shaped beam.
FIGS. 3A and 3B show a state in which inverted T-shaped beams are bridged between both building units on the lower floor, where FIG. 3A is a cross-sectional view and FIG. 3B is a plan view.
FIG. 4 is a cross-sectional view of an essential part showing an inverted T-beam mounting structure.
FIG. 5 is a perspective view showing an inverted T-beam mounting hardware.
FIG. 6 is a perspective view showing a floor panel installation process of an upper floor building unit in the unit building of the second embodiment.
7A and 7B show a structure for attaching a floor panel to an end portion of a beam. FIG. 7A is a perspective view and FIG. 7B is a cross-sectional view.
FIGS. 8A and 8B show a mounting structure of the floor panel to the middle part of the beam, in which FIG. 8A is a perspective view and FIG. 8B is a view taken along the line BB in FIG.
FIG. 9 is a perspective view showing a process of installing a balcony unit.
FIG. 10 shows a portion A of FIG. 9, (A) is a perspective view, and (B) is a cross-sectional view.
11 is a cross-sectional view showing a portion B in FIG. 9;
FIG. 12 is a perspective view showing an end of a beam.
FIGS. 13A and 13B show a process of attaching a sealing material to the upper part of the wall of a building unit on the lower floor, FIG. 13A is a perspective view showing the installation of the sheet on the wall, and FIG. 13B shows the installation of the elastic sealing material. (C) is a perspective view which shows the overlap margin of an elastic sealing material.
FIG. 14 is a cross-sectional view showing a heat insulating material on the lower surface of the beam.
[Explanation of symbols]
1a Lower-floor building unit 1b Upper-floor building unit 2 Floor 3 Wall 4 Beam 5 Lower roof unit 6 Balcony unit 11 Bottom plate 12 Standing plate 20 Floor frame 20A Beam joist (floor frame material)
41 Posts 42 Mounting hardware 60 Unit building 70 Floor frame assembly 70A Edge joist (floor frame material)
93 Heat insulating material 95 Ceiling surface material

Claims

A wall-type building unit in which a wall is erected on one of two opposing sides of a square floor and no wall is erected on the other side, and the other side is on the inside. In a unit building where a beam is supported between the above-mentioned walls of both building units and inside the building unit in plan view, and the end of the building unit on the upper floor is supported by this beam. The beam is a steel beam having an inverted T-shaped cross section, and when the end of the building unit on the upper floor is supported by the bottom plate portion of the inverted T-shaped cross section of the beam, the beam inside the wall of the building unit is supported. Two wooden columns corresponding to one side and the other side of the bottom plate portion of the beam are juxtaposed to each other, and mounting hardware is attached to each of the heads of the two supporting columns. Both mounting brackets are fixed to both struts with bolts that penetrate both side plates and both struts, and are provided on one side and the other side of the two struts The wall frame member and connected by a connecting plate which, Nde write sandwiching the central portion provided with a recess in the connecting plate between the bottom plate portion of the top plate and the beams of the two mounting hardware, located in the bottom plate portion of the beam is said depression Thus, the unit building is characterized in that the bottom plate portion of the beam is bolted to the top plate of both mounting hardware.

2. The unit building according to claim 1, wherein an end of an upper floor building unit is supported on one side of a bottom plate portion of the inverted T-shaped cross section of the beam, and a lower roof unit or a balcony unit is supported on the other side.

The unit building of Claim 1 or 2 which joins the floor frame material of the building unit of an upper floor to the standing board part of the reverse T-shaped cross section of the said beam.

The unit building according to claim 2, wherein the floor frame material of the upper floor building unit and the roof frame material of the lower roof unit or the floor frame material of the balcony unit are joined to the upright plate portion of the inverted T-shaped cross section of the beam. .

The unit building according to any one of claims 1 to 4, wherein the starting point of the upright plate portion is retreated from the starting point of the bottom plate portion in the longitudinal direction of the beam at the end portion of the beam.

The unit building according to any one of claims 1 to 5, wherein a heat insulating material is loaded between a lower surface of the bottom plate portion of the beam and a ceiling surface material installed below the beam.