JP3826353B2 - Column and beam joint structure - Google Patents

Column and beam joint structure Download PDF

Info

Publication number
JP3826353B2
JP3826353B2 JP2002251359A JP2002251359A JP3826353B2 JP 3826353 B2 JP3826353 B2 JP 3826353B2 JP 2002251359 A JP2002251359 A JP 2002251359A JP 2002251359 A JP2002251359 A JP 2002251359A JP 3826353 B2 JP3826353 B2 JP 3826353B2
Authority
JP
Japan
Prior art keywords
beam main
column
bar
beams
bars
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
Application number
JP2002251359A
Other languages
Japanese (ja)
Other versions
JP2004092051A (en
Inventor
春生 中澤
行信 黒瀬
正美 戸沢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimizu Corp
Original Assignee
Shimizu Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shimizu Corp filed Critical Shimizu Corp
Priority to JP2002251359A priority Critical patent/JP3826353B2/en
Publication of JP2004092051A publication Critical patent/JP2004092051A/en
Application granted granted Critical
Publication of JP3826353B2 publication Critical patent/JP3826353B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Description

【０００１】
【発明の属する技術分野】
本発明は、低コストで施工性の良い柱と梁の接合構造に関する。
【０００２】
【従来の技術】
従来より、鉄筋コンクリート造の柱１３及び梁１１は、図８（ａ）に示すように梁１１を構成する主筋１２の端部が、前記柱１３の内方に配設された上で柱１３を構成するコンクリート１４に埋設されることにより、両者は接合されている。ここで用いられる前記梁１１の主筋１２には、前記コンクリート１４との定着強度を高めることを目的に、図８（ｂ）に示すように、末端部１２ａが折り曲げられたフック鉄筋や、拡径部が設けられる頭部付き鉄筋が用いられている。
【０００３】
【発明が解決しようとする課題】
これら梁１１の主筋１２の端部は、柱１３の断面のほぼ全長にわたる長さまで配設される構成であるため、柱１３の配筋が煩雑となりやすい。しかし、前記主筋１２の端部における柱１３の内方に配設される長さ、つまり主筋１２の端部のコンクリート１４への定着長さを、柱１３の断面のほぼ全長にわたる長さから、柱１３の断面の約半分程度に短くとると、定着部の脆性的な破壊、例えば掻き出し破壊やコーン破壊を誘発しやすいため、梁１１を構成する主筋１２すべての定着長さを前記柱１３の断面の約半分程度にとどめて、配筋を簡略化することは困難であった。
【０００４】
上記事情に鑑み、本発明は、低コストで施工性の良い柱と梁の接合構造を提供することを目的としている。
【０００５】
【課題を解決するための手段】
請求項１記載の柱と梁の接合構造は、末端部に拡径部を有する頭部付き鉄筋よりなり、水平方向に平行となるように離間配置される対をなす第１の梁主筋、及び該第１の梁主筋と同様の頭部付き鉄筋よりなり、対をなす該第１の梁主筋の間でこれらと平行となるように複数が離間配置される第２の梁主筋が、上端面近傍及び下端面近傍の両者に鉛直方向で同軸となるように備えられる鉄筋コンクリート造の梁と、鉄筋コンクリート造の柱を備えた構造物の柱と梁の接合構造であって、前記梁と平面視で 180 度回転した梁とが、柱を挟んで隣り合うように対をなして同軸上に配置されており、前記柱の側面に突き合わされる側の前記梁の第１の梁主筋及び第２の梁主筋の端部が、柱の内方に配設される状態でコンクリートに埋設されて、柱と対をなす梁とがそれぞれ接合されており、前記梁を構成する第１の梁主筋及び第２の梁主筋の前記柱の内方に配される長さが、前記第２の梁主筋を柱の断面の略全長に達する長さ、前記第１の梁主筋を柱の断面の略中間部に達する長さとし、前記第１の梁主筋のコンクリートへの定着長さを前記第２の梁主筋のコンクリートへの定着長さよりも短くしており、前記梁の対をなす第１の梁主筋の何れか一方とこれと隣り合う第２の梁主筋との離間間隔が、他方の第１の梁主筋とこれと隣り合う第２の梁主筋との離間間隔と比較して小さく形成された上で、第２の梁主筋どうしが所定の間隔をもって離間配置されており、前記柱の内方には、対をなす梁の第１の梁主筋の端部どうしが、分離された状態で向かい合わされて配設されているとともに、対をなす梁の第２の梁主筋の端部どうしが、差し違え配列を形成するように配設されていることを特徴としている。
【０００７】
請求項２記載の柱と梁の接合構造は、前記第１の梁主筋及び第２の梁主筋の端部を埋設するコンクリートには、繊維補強コンクリートが用いられていることを特徴としている。
【０００８】
請求項３記載の柱と梁の接合構造は、前記第２の梁鉄筋には、前記頭部付き鉄筋に代えて末端部が直線状の直線鉄筋が用いられることを特徴としている。
【０００９】
請求項４記載の柱と梁の接合構造は、末端部に拡径部を有する頭部付き鉄筋よりなり、水平方向に平行となるように離間配置される対をなす第１の梁主筋、及び末端部が折り曲げられたフック鉄筋よりなり、対をなす該第１の梁主筋の間でこれらと平行となるように複数が離間配置される第２の梁主筋が、上端面近傍及び下端面近傍の両者に鉛直方向で同軸となるように備えられる鉄筋コンクリート造の梁と、鉄筋コンクリート造の柱を備えた構造物の柱と梁の接合構造であって、前記梁が、柱を挟んで隣り合うように対をなして同軸上に配置されており、前記柱の側面に突き合わされる側の前記梁の第１の梁主筋及び第２の梁主筋の端部が、柱の内方で断面の略中間部まで配設される状態で柱の繊維補強コンクリートに埋設されて、柱と対をなす梁とがそれぞれ接合され、前記第１の梁主筋の繊維補強コンクリートへの定着長さを前記第２の梁主筋の繊維補強コンクリートへの定着長さよりも短くしており、前記柱の内方には、対をなす梁の第１の梁主筋の端部どうし及び対をなす梁の第２の梁主筋の端部どうしが分離された状態で向かい合わされて配設されていることを特徴としている。
【００１１】
【発明の実施の形態】
以下、本発明の柱と梁の接合構造を図１から図７に示す。本発明は、鉄筋コンクリート造の柱と梁の接合に際し、梁を構成する主筋について、側面近傍に配置されている第１の梁主筋に頭部付き鉄筋を用いるとともに、第１の梁主筋もしくは第２の梁主筋の何れか一方の端部が柱の断面の略中間部に達する程度に配設し、これらを埋設するコンクリートには繊維コンクリートを用いることにより、鉄筋量を減少させ、配筋を簡略化させるものである。
【００１２】
（第１の実施の形態）
図１に示すように、構造物を構成する柱１は、鉛直軸方向に立設される複数の柱主筋２と、該柱主筋２を取り囲むように所定のピッチで配される帯筋３とを籠状に組み立てた上で、コンクリート４を打設した鉄筋コンクリート造により構成される。
また、構造物を構成する梁５は、水平軸方向に配設される第１の梁主筋６及び第２の梁主筋７と、該第１の梁主筋６及び第２の梁主筋７を取り囲むように所定のピッチで配されるあばら筋８を籠状に組み立て、コンクリート９を打設した鉄筋コンクリート造により構成される。該第１の梁主筋６及び第２の梁主筋７はともに、末端部に拡径部を設けられた頭部付き鉄筋が用いられており、第１の梁主筋６は、対をなして水平方向で平行に離間配置され、第２の梁主筋７は、対をなす第１の梁主筋６の間でこれらと平行となるように、複数本が所定の間隔をもって離間配置されている。このように配設された該第１の梁主筋６及び第２の梁主筋７の組み合わせは、前記梁５の上端面近傍及び下端面近傍の各々に、鉛直軸方向で同軸に位置するように配置されている。したがって、前記梁５の側面近傍には第１の梁主筋６、内方には第２の梁主筋７が配置される構成となっている。
【００１３】
このような構成の前記柱１と梁５の接合構造は、前記梁５を構成する第１の梁主筋６及び第２の梁主筋７の、柱１の側面に突き合わされる側の端部が、柱１の内方に位置するように配設されることにより、柱１のコンクリート４に定着されて、柱１と梁５が接合される構成となっている。このとき、図１（ａ）に示すように、前記梁５の第１の梁主筋６と第２の梁主筋７とでは、柱１のコンクリート４への定着長さが異なるように配設されており、第１の梁主筋６の端部が、第２の梁主筋７と比較して短い構成となっている。前記柱１の側方から見ると、図１（ｃ）に示すように、第２の梁主筋７の定着長さは柱１の断面のほぼ全長に至っているものの、第１の梁主筋６の定着長さは、図１（ｂ）に示すように、柱１の断面の約中間部程度にとどまるよう配設されている。
なお、第１の梁主筋６及び第２の梁主筋７のコンクリート４への定着長さは、これに限るものではなく、第１の梁主筋６の定着長さが柱１の断面のほぼ全長にわたり、第２の梁主筋７が柱１の断面の約中間部程度にとどまるよう配設されてもよい。
【００１４】
上述する構成によれば、柱１と梁５の接合構造は、柱１と接合する側の前記梁５を構成する第１の梁主筋６の端部を、柱１の内方に配設する際に、第１の梁主筋６は、柱１の断面の約中間部程度にとどまるよう配設する一方で、第２の梁主筋７は柱１の断面のほぼ全長に至るように配設することから、第１の梁主筋６におけるコンクリート４への定着長さが短くとも、前記柱１と梁５の接合部近傍に脆性的な破壊が生じることを防止することが可能となる。
また、第１の梁主筋６は、その端部が柱１の断面の約中間部程にとどまるよう配設されることから、構造物全体を総じて見ると、鉄筋量を大幅に削減することが可能となり、コスト削減に大きく寄与することが可能となる。
さらに、第１の梁主筋６及び第２の梁主筋７に対して、頭部付き鉄筋を用いていることから、一般に用いられるフック鉄筋等と比較してコンクリート４への定着強度を高めることが可能になるとともに、柱１と梁５の接合構造を側方から見ると、図１（ｂ）（ｃ）に示すように、接合部の断面が簡素化されており、配筋がさらに容易で施工性を向上することが可能となる。
【００１５】
本実施の形態では、例えば構造物の外周部等で見られるような、柱１の向かい合う側面の一方にのみ梁５が接合される場合の柱１と梁５の接合構造を例に挙げて、前記梁５の内方に配設される第２の梁主筋７の定着長さを、従来と同様の柱１の断面のほぼ全長とし、梁５の側面近傍に配置されている第１の梁主筋６の定着長さを柱１の断面の約中間部程度として、第２の梁主筋７と比較して短く配設する構成を示した。次に、例えば構造物の内部等で見られるような、柱１の向かい合う側面の両者各々に梁５が接合される場合の、柱１と梁５の接合構造を図２を用いて詳述する。
【００１６】
（第２の実施の形態）
図２（ａ）に示すように、前記柱１及び梁５、５ａは、第１の実施の形態と同様の鉄筋コンクリート造よりなり、梁５、５ａが、柱１を挟んで隣り合うように、同軸上に対をなして配置されている。これら対をなす梁５、５ａは、第１の実施の形態と同様に、第１の梁主筋６が、対をなして水平方向で平行に離間配置され、第２の梁主筋７は、対をなす第１の梁主筋６の間でこれらと平行となるように、複数本が離間配置されており、これら第１の梁主筋６及び第２の梁主筋７の組み合わせは、前記梁５、５ａの上端面近傍及び下端面近傍の各々に、鉛直軸状で同軸となるように配置されている。また、第１の梁主筋６の端部は、柱１の断面の約中間部程度に配設されるよう長さが確保されている一方で、第２の梁主筋７は、柱１の断面のほぼ全長に至るように配設される長さが確保されている。
しかし、対をなす第１の梁主筋６の間に配された複数の第２の梁主筋７は、何れか一方の第１の梁主筋６と隣り合う第２の梁主筋７との離間間隔Ｌ１を、他方の第１の梁主筋６と隣り合う第２の梁主筋７との離間間隔Ｌ２と比較して小さくとった上で、第２の梁主筋７どうしは所定の間隔をもって離間配置されている。
【００１７】
これら第１の梁主筋６及び第２の梁主筋７が備えられた梁５は、その端部を柱１の一方の側面に突き合わせるとともに、これと向かい合う他方の側面には、前記梁５を平面視で180度回転された梁５ａが端部を突き合わされることにより、前記梁５、５ａは、柱１を挟んで隣り合うように対をなして配されることとなる。このような構成は、柱１を挟んで対をなす梁５、５ａの第１の梁主筋６の端部どうしが、図２（ｂ）に示すように向かい合うものの、第２の梁主筋７の端部どうしは、図２（ｃ）に示すように向かい合うことなく所定の距離（離間間隔Ｌ２−離間間隔Ｌ１）をもって常に差し違いに配列されるものである。これにより、前記柱１の内方では、対をなす梁５、５ａの第１の梁主筋６の端部どうしが、向かい合わされるようにして配設されるとともに、第２の梁主筋７の端部どうしは、あき重ね継ぎ手が形成され、これに前記柱１のコンクリート４が打設されることにより、柱１と梁５は接合されることとなる。
【００１８】
上述する構成によれば、前記柱１の内方では、対をなす梁５の側面近傍に配される第１の梁主筋６の端部どうしが、向かい合わされるようにして配設されるとともに、対をなす梁５の内方に配される第２の梁主筋７の端部どうしは、差し違い配列を形成するようにして配設されることから、対をなす梁５、５ａの第１の梁主筋６の端部どうしを向かい合わさて配筋することにより、第２の梁主筋７どうしはあき重ね継ぎ手が形成されることとなり、柱１を挟んで隣り合う梁５どうしは位置をずらすことなく対向して配置することができるため、配筋作業が容易で施工性が向上するとともに、鉄筋継ぎ手を大幅に削減することが可能であるため、コストを大幅に削減することが可能となる。
【００１９】
ところで、前記梁５の柱１への応力伝達は、柱１の内方に配設した第１の梁主筋６及び第２の梁主筋７の端部における直線部分のコンクリート４への付着と、末端部分の支圧作用によって行われる。このうち、第１の梁主筋６及び第２の梁主筋７の端部における直線部分のコンクリート４への付着による応力伝達は、定着部の付着割裂が生じやすい。このような現象に対応すべく、第１の梁主筋６及び第２の梁主筋７の端部が配設される柱１の梁５との接合部分に繊維補強コンクリート１０を用いた事例を第３の実施の形態に示す。
【００２０】
（第３の実施の形態）
図３は、第１の実施の形態で示したものと同様の柱１と梁５を用いて、柱１の向かい合う側面の一方に梁５を接合するものであり、これらの接合構造には、梁５の第１の梁主筋６及び第２の梁主筋７の端部が配設される柱１の梁５との接合部分にのみ、柱１を構成するコンクリート４に代わり、繊維補強コンクリート１０を用いたものである。また、図４は、第２の実施の形態で示したものと同様の柱１と梁５、５ａを用いて、柱１の向かい合う側面の両者に梁５、５ａを同軸上に配置した上で接合するものであり、これらの接合構造にも同様に、梁５、５ａの第１の梁主筋６及び第２の梁主筋７の端部が配設される柱１の梁５、５ａとの接合部分にのみ、柱１を構成するコンクリート４に代わり、繊維補強コンクリート１０を用いたものである。
【００２１】
前記繊維補強コンクリート１０は、金属または合成樹脂を原料とした短繊維材料を混入したもので、主要な繊維材料としては、鋼繊維、ガラス繊維、ポリエチレン繊維、ポリプロピレン繊維、アラミド繊維、炭素繊維等何れを用いても良いが、本実施の形態では鋼繊維を用いている。繊維補強コンクリート１０は、引張強度、曲げ強度、耐衝撃性、靱性、付着性能などに対して通常のコンクリートと比較して大幅な改善を図ったものであり、本発明では、この優れた付着性能を利用して、柱１の梁５、５ａとの接合部分に、繊維補強コンクリート１０を適用し、梁５、５ａの第１の梁主筋６及び第２の梁主筋７の端部の付着割裂強度を高めるものである。
【００２２】
上述する構成によれば、柱１と梁５及び柱１と梁５、５ａの接合構造は、梁５、５ａの第１の梁主筋６及び第２の梁主筋７の端部を柱１の内方に配設し、柱１の梁５、５ａとの接合部分にのみ、コンクリート４に代わり繊維補強コンクリート１０を用いてこれらを埋設することにより柱１と梁５を接合するため、繊維補強コンクリート１０の付着性能により、第１の梁主筋６及び第２の梁主筋７の周囲に生じやすいひび割れ拡大を防止することが可能となるとともに、付着割裂強度を高めることが可能となる。
【００２３】
先にも述べたように、梁５の柱１への応力伝達は、柱１の内方に配設した第１の梁主筋６及び第２の梁主筋７の端部における直線部分の繊維補強コンクリート１０への付着、及び末端部分の支圧作用によって行われる。本実施の形態では、柱１と梁５の接合構造に繊維補強コンクリート１０を用いることにより、第１の梁主筋６及び第２の梁主筋７の端部における直線部分の繊維補強コンクリート１０への付着がより強化されることとなるため、例えば、第１の梁主筋６及び第２の梁主筋７の端部の両者に対して、柱１への配設長さをより短くすること可能となる。
また、梁５の内方に配される第２の梁主筋７に対して、第１から第３の実施の形態で採用した頭部付き鉄筋と比較して付着強度の劣るような、末端部に折り曲げ部を有するフック鉄筋や、末端部に細工を有しない直線鉄筋等を用いることも可能となる。第４の実施の形態及び第５の実施の形態では、柱１と梁５の接合構造に繊維補強コンクリート１０を適用した上で、第２の梁主筋７に頭部付き鉄筋と異なる鉄筋を用いた場合の他の事例を示す。
【００２４】
（第４の実施の形態）
図５（ｂ）（ｃ）に示すように、前記柱１及び梁５、５ａは、第２の実施の形態と同様の鉄筋コンクリート造よりなるが、梁５、５ａの第１の梁主筋６には頭部付き鉄筋、第２の梁主筋７には末端部が直線状の直線鉄筋を用いている。
また、図５（ａ）に示すように、対をなす第１の梁主筋６の間に配された複数の第２の梁主筋７は、何れか一方の第１の梁主筋６と隣り合う第２の梁主筋７との離間間隔Ｌ１を、他方の第１の梁主筋６と隣り合う第２の梁主筋７との離間間隔Ｌ２と比較して小さくとった上で、第２の梁主筋７どうしは所定の間隔をもって離間配置されている。これら第１の梁主筋６及び第２の梁主筋７が備えられた梁５は、その端部を柱１の一方の側面に突き合わせるとともに、これと向かい合う他方の側面には、前記梁５を平面視で180度回転された梁５ａが端部を突き合わされることにより、前記梁５、５ａは、柱１を挟んで隣り合うように対をなして配される。
【００２５】
このような構成は、柱１を挟んで対をなす梁５、５ａの第１の梁主筋６の端部どうしが図５（ｂ）に示すように向かい合うものの、第２の梁主筋７の端部どうしは、図５（ｃ）に示すように向かい合うことなく所定の距離（離間間隔Ｌ２−離間間隔Ｌ１）をもって常に差し違いに配列されるものである。これにより、前記柱１の内方では、対をなす梁５、５ａの第１の梁主筋６の端部どうしが、向かい合わされるようにして配設されるとともに、第２の梁主筋７の端部どうしは、あき重ね継ぎ手が形成され、これに前記柱１の繊維補強コンクリート１０が打設されることにより、柱１と梁５は接合されることとなる。
【００２６】
上述する構成によれば、柱１と梁５の接合構造に繊維補強コンクリート１０を適用する構成としたことから、第２の梁主筋７に直線鉄筋を用いることが可能となり、配筋が容易で施工性を向上することが可能となるとともに、第２の梁主筋７の末端部への加工を行う必要がないため、工費削減、工期短縮に大きく寄与することが可能となる。
【００２７】
（第５の実施の形態）
図６（ｂ）（ｃ）に示すように、前記柱１及び梁５は、第１の実施の形態と同様の構成による鉄筋コンクリート造よりなるが、第１の梁主筋６が頭部付き鉄筋、第２の梁主筋７が端部を折り曲げたフック鉄筋が用いられている。このような構成の前記柱１と梁５の接合構造は、前記梁５を構成する第１の梁主筋６及び第２の梁主筋７の、柱１の側面に突き合わされる側の端部が、柱１の内方に位置するように配設されることにより、柱１の梁５との接合部分に打設された繊維補強コンクリート１０に埋設されて、柱１と梁５が接合される構成となっている。このとき、図６（ａ）に示すように、前記梁５の第１の梁主筋６及び第２の梁主筋７の両者は、柱１の内方への配設長さが短く配設されており、前記柱１の側方から見ると、第１の梁主筋６及び第２の梁主筋７の柱１の内方への配設長さは、図６（ｂ）（ｃ）に示すように、柱１の断面の約中間部程度にとどまるよう配設されている。
【００２８】
また、図７では、上述する梁５が、柱１を挟んで隣り合うように、同軸上に対をなして配置される例を示している。これらの第１の梁主筋６及び第２の梁主筋７は、互いの端部同士が柱の断面の中間部近傍で向かい合わせとなるように、柱１の内方に配設され、これに繊維補強コンクリート１０が打設されることにより、柱１と梁５は接合されることとなる。
【００２９】
上述する構成によれば、前記梁５が、柱１を挟んで隣り合うように、同軸上に対をなして配置される際に、これらの第１の梁主筋６及び第２の梁主筋７は、互いの端部同士が柱の断面の中間部近傍で向かい合わせとなるように、柱１の内方に配設されることから、配設を簡素化でき施工性を向上することが可能になるとともに、建築物を総じて見ると鉄筋量を大幅に削減することができ、工費を大幅に削減することが可能になる。
【００３０】
【発明の効果】
請求項１記載の柱と梁の接合構造によれば、末端部に拡径部を有する頭部付き鉄筋よりなり、水平方向に平行となるように離間配置される対をなす第１の梁主筋、及び該第１の梁主筋と同様の頭部付き鉄筋よりなり、対をなす該第１の梁主筋の間でこれらと平行となるように複数が離間配置される第２の梁主筋が、上端面近傍及び下端面近傍の両者に鉛直方向で同軸となるように備えられる鉄筋コンクリート造の梁と、鉄筋コンクリート造の柱を備えた構造物の柱と梁の接合構造であって、前記梁と平面視で 180 度回転した梁とが、柱を挟んで隣り合うように対をなして同軸上に配置されており、前記柱の側面に突き合わされる側の前記梁の第１の梁主筋及び第２の梁主筋の端部が、柱の内方に配設される状態でコンクリートに埋設されて、柱と対をなす梁とがそれぞれ接合されており、前記梁を構成する第１の梁主筋及び第２の梁主筋の前記柱の内方に配される長さが、前記第２の梁主筋を柱の断面の略全長に達する長さ、前記第１の梁主筋を柱の断面の略中間部に達する長さとし、第１の梁主筋のコンクリートへの定着長さを第２の梁主筋のコンクリートへの定着長さよりも短くした構成となっている。これにより、第１の梁主筋のコンクリートへの定着長さが短くなるととも、第２の梁主筋は柱の断面の略全長に達する長さに配されることから、前記柱と梁の接合部近傍に脆性的な破壊が生じること防止することが可能となる。
また、第１の梁主筋の端部が柱の断面の約中間部程度にとどまるよう配設されることから、構造物全体を総じて見ると、鉄筋量を大幅に削減することが可能となり、コスト削減に大きく寄与することが可能となる。
さらに、第１の梁主筋及び第２の梁主筋に対して、頭部付き鉄筋を用いていることから、一般に用いられるフック鉄筋等と比較してコンクリートへの定着強度を高めることが可能になるとともに、柱と梁の接合構造を側方から見ると、接合部の断面が簡素化されており、配筋がさらに容易で施工性を向上することが可能となる。
【００３１】
また、請求項１記載の柱と梁の接合構造によれば、前記梁の対をなす第１の梁主筋の何れか一方とこれと隣り合う第２の梁主筋との離間間隔が、他方の第１の梁主筋とこれと隣り合う第２の梁主筋との離間間隔と比較して小さく形成された上で、第２の梁主筋どうしが所定の間隔をもって離間配置されており、前記柱の内方には、対をなす梁の第１の梁主筋の端部どうしが分離された状態で向かい合わされて配設されているとともに、対をなす梁の第２の梁主筋の端部どうしが、差し違え配列を形成するように配設されていることから、対をなす梁の第１の梁主筋の端部どうしを向かい合わさて配筋することにより、第２の梁主筋どうしはあき重ね継ぎ手が形成されることとなり、柱を挟んで隣り合う梁どうしは位置をずらすことなく対向して配置することができるため、配筋作業が容易で施工性が向上するとともに、鉄筋継ぎ手を大幅に削減することが可能であるため、コストを大幅に削減することが可能となる。
【００３２】
請求項２記載の柱と梁の接合構造によれば、前記第１の梁主筋及び第２の梁主筋の端部を埋設するコンクリートには、繊維補強コンクリートが用いられていることから、繊維補強コンクリートの付着性能により、第１の梁主筋及び第２の梁主筋の周囲に生じやすいひび割れ拡大を防止することが可能となるとともに、付着割裂強度を高めることが可能となる。
【００３３】
また、柱と梁の接合構造に繊維補強コンクリートを用いることにより、第１の梁主筋及び第２の梁主筋の端部における直線部分の繊維補強コンクリートへの付着がより強化されることとなるため、第１の梁主筋及び第２の梁主筋の端部の両者に対して、柱への配設長さをより短くすること可能となる。
また、梁の内方に配される第２の梁主筋に対して、末端部に折り曲げ部を有するフック鉄筋や、末端部に細工を有しない直線鉄筋を用いることも可能となる。
【００３４】
請求項３記載の柱と梁の接合構造によれば、前記第２の梁鉄筋には、前記頭部付き鉄筋に代えて末端部が直線状の直線鉄筋が用いられることから、配筋が容易で施工性を向上することが可能となるとともに、第２の梁主筋の末端部への加工を行う必要がないため、工費削減、工期短縮に大きく寄与することが可能となる。
【００３５】
請求項４記載の柱と梁の接合構造によれば、末端部に拡径部を有する頭部付き鉄筋よりなり、水平方向に平行となるように離間配置される対をなす第１の梁主筋、及び末端部が折り曲げられたフック鉄筋よりなり、対をなす該第１の梁主筋の間でこれらと平行となるように複数が離間配置される第２の梁主筋が、上端面近傍及び下端面近傍の両者に鉛直方向で同軸となるように備えられる鉄筋コンクリート造の梁と、鉄筋コンクリート造の柱を備えた構造物の柱と梁の接合構造であって、前記柱の側面に突き合わされる側の前記梁の第１の梁主筋及び第２の梁主筋の端部が、柱の内方で断面の略中間部まで配設される状態で、繊維補強コンクリートに埋設されて柱と梁が接合され、前記第１の梁主筋の繊維補強コンクリートへの定着長さを前記第２の梁主筋の繊維補強コンクリートへの定着長さよりも短くしている。
また、前記梁が、柱を挟んで隣り合うように対をなして同軸上に配置されており、前記柱の内方には、対をなす梁の第１の梁主筋の端部どうし及び第２の梁主筋の端部どうしが分離された状態で向かい合わされて配設されることから、配設を簡素化でき施工性を向上することが可能になるとともに、建築物を総じて見ると鉄筋量を大幅に削減することができ、工費を大幅に削減することが可能となる。
【図面の簡単な説明】
【図１】 本発明の柱と梁の接合構造を示す図である。
【図２】 本発明の柱を挟んで向かい合う両側面に梁が配置される場合の柱と梁の接合構造を示す図である。
【図３】 本発明の繊維補強コンクリートを適用した場合の柱と梁の接合構造を示す図である。
【図４】 本発明の繊維補強コンクリートを適用した場合の柱と梁の接合構造の他の事例を示す図である。
【図５】 本発明の繊維補強コンクリートを適用し、梁の第２の梁主筋に直線鉄筋を用いた場合の柱と梁の接合構造を示す図である。
【図６】 本発明の繊維補強コンクリートを適用し、梁の第２の梁主筋にフック鉄筋を用いた場合の柱と梁の接合構造を示す図である。
【図７】 本発明の繊維補強コンクリートを適用し、梁の第２の梁主筋にフック鉄筋を用いた場合の柱と梁の接合構造の他の事例を示す図である。
【図８】 従来の柱と梁の接合構造を示す図である。
【符号の説明】
１ 柱
２ 主筋
３ 帯筋
４ コンクリート
５ 梁
６ 第１の梁主筋
７ 第２の梁主筋
８ あばら筋
９ コンクリート
１０ 繊維補強コンクリート
１１ 梁
１２ 主筋
１３ 柱
１４ コンクリート[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a column-to-beam joint structure with low cost and good workability.
[0002]
[Prior art]
Conventionally, as shown in FIG. 8A, the reinforced concrete column 13 and the beam 11 have the ends of the main bars 12 constituting the beam 11 disposed on the inside of the column 13, and the column 13 is formed. Both are joined by being embedded in the concrete 14 which comprises. As shown in FIG. 8 (b), the main reinforcing bar 12 of the beam 11 used here has a hook reinforcing bar with a bent end portion 12a and an expanded diameter as shown in FIG. 8 (b). A rebar with a head provided with a section is used.
[0003]
[Problems to be solved by the invention]
Since the ends of the main bars 12 of the beams 11 are arranged up to the length of almost the entire length of the cross section of the column 13, the bar arrangement of the columns 13 tends to be complicated. However, disposed inwardly is the length of the definitive to the end posts 13 of the main reinforcement 12, that is, the fixing length in the concrete 14 of the end portion of the main reinforcement 12, the length over substantially the entire length of the cross section of the pillar 13 If the length is shortened to about half of the cross section of the pillar 13, brittle fracture of the anchoring portion, for example, scraping fracture or cone fracture is likely to be induced. It was difficult to simplify the bar arrangement by limiting it to about half of the cross section.
[0004]
In view of the above circumstances, an object of the present invention is to provide a pillar-to-beam joint structure with low cost and good workability.
[0005]
[Means for Solving the Problems]
The joint structure of a column and a beam according to claim 1 is composed of a rebar with a head having an enlarged diameter portion at a distal end, and a pair of first beam main reinforcing bars that are spaced apart so as to be parallel to the horizontal direction, and The second beam main bars, which are composed of reinforcing bars with heads similar to the first beam main bars, are arranged apart from each other so as to be parallel to each other between the paired first beam main bars. A reinforced concrete beam provided to be coaxial in the vertical direction in both the vicinity and the vicinity of the lower end surface, and a column-to-beam joint structure of a structure having a reinforced concrete column, in plan view with the beam The beams rotated 180 degrees are arranged coaxially in pairs so as to be adjacent to each other with the column interposed therebetween, and the first beam main reinforcing bar and the second beam of the beam on the side abutted against the side surface of the column end of the beam main reinforcement can be embedded in concrete in a state of being disposed inwardly of the pillars, the pillars and pairs And to the beams are joined respectively, the first beam main reinforcements and said post length that is disposed inwardly of the second beam main reinforcement are, the cross section of the pillar said second beam main reinforcement constituting the beam The length of the first beam main bar is set to a length that reaches the substantially middle part of the cross section of the column, and the fixing length of the first beam main bar to the concrete is set to the concrete of the second beam main bar. The separation distance between any one of the first beam main bars forming the pair of beams and the second beam main bar adjacent to the first beam main bar is the same as that of the other first beam main bar. The second beam main bars are spaced apart from each other with a predetermined interval, and a pair is formed on the inner side of the column. end each other of the first beam main reinforcement Nasu beams, Mukaiawasa is in conjunction with and is disposed in an isolated state, pairs End of the second beam main reinforcement each other beam Nasu, is characterized in that it is arranged to form a Sashichigae sequence.
[0007]
The column-beam joint structure according to claim 2 is characterized in that fiber reinforced concrete is used for the concrete in which the ends of the first beam main bar and the second beam main bar are embedded.
[0008]
Joint structure of columns and beams of the third aspect, wherein the second beam rebar end in place of the head with reinforcing bar is characterized in that the linear straight rebar is used.
[0009]
The joint structure of a column and a beam according to claim 4 is composed of a reinforcing bar with a head having an enlarged diameter part at a terminal part, and a pair of first beam main reinforcing bars that are spaced apart so as to be parallel to the horizontal direction, and The second beam main bars, which are composed of hook reinforcing bars whose end portions are bent, and are arranged apart from each other so as to be parallel to the pair of first beam main bars, are near the upper end surface and the lower end surface A reinforced concrete beam provided to be coaxial with each other in the vertical direction, and a column-to-beam joint structure of a structure having a reinforced concrete column so that the beams are adjacent to each other across the column is disposed coaxially in pairs, the ends of the first beam main reinforcements and second beam main reinforcement of the beam on the side to be butted to the side surface of the pillar, substantially in cross-section in the inside of the pillar is embedded in the fiber reinforced concrete pillars in a state of being disposed to the intermediate portion, pillars and pairs And the beam Nasu are bonded respectively, the fixing length of the fiber reinforced concrete of the first beam main bars are shorter than the fixing length of the fiber reinforced concrete of the second beam main reinforcement, the inner of the column Is characterized in that the ends of the first beam main bars of the paired beams and the ends of the second beam main bars of the paired beams are arranged facing each other in a separated state. Yes.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the column-beam joint structure of the present invention is shown in FIGS. In the present invention, when a reinforced concrete column and beam are joined, a reinforcing bar with a head is used as the first beam main bar arranged near the side surface of the main bar constituting the beam, and the first beam main bar or the second bar bar is also used. It is arranged so that either one of the main bars of the beam reaches almost the middle of the cross section of the column, and fiber concrete is used for the concrete to embed these, thereby reducing the amount of reinforcing bars and simplifying the bar arrangement. It is to make it.
[0012]
(First embodiment)
As shown in FIG. 1, a column 1 constituting a structure includes a plurality of column main bars 2 erected in the vertical axis direction, and a strip 3 arranged at a predetermined pitch so as to surround the column main bars 2. It is comprised by the reinforced concrete structure which casts concrete 4 after assembling in a bowl shape.
The beam 5 constituting the structure surrounds the first beam main bar 6 and the second beam main bar 7 arranged in the horizontal axis direction, and the first beam main bar 6 and the second beam main bar 7. In this way, the ribs 8 arranged at a predetermined pitch are assembled in a bowl shape, and are constituted by a reinforced concrete structure in which concrete 9 is placed. Both the first beam main bar 6 and the second beam main bar 7 use a head-reinforcing bar having an enlarged diameter portion at the end, and the first beam main bar 6 forms a pair in a horizontal direction. A plurality of second beam main bars 7 are spaced apart from each other at a predetermined interval so as to be parallel to each other between the pair of first beam main bars 6. The combination of the first beam principal bar 6 and the second beam principal bar 7 arranged in this way is positioned coaxially in the vertical axis direction in the vicinity of the upper end surface and the lower end surface of the beam 5. Has been placed. Therefore, the first beam main reinforcing bar 6 is arranged in the vicinity of the side surface of the beam 5 and the second beam main reinforcing bar 7 is arranged inside.
[0013]
In the joining structure of the column 1 and the beam 5 having such a configuration, the end portions of the first beam principal bar 6 and the second beam principal bar 7 constituting the beam 5 on the side to be abutted with the side surface of the column 1 are arranged. By being disposed so as to be located inward of the pillar 1, the pillar 1 is fixed to the concrete 4 of the pillar 1 and the pillar 1 and the beam 5 are joined. At this time, as shown in FIG. 1A, the first beam main reinforcement 6 and the second beam main reinforcement 7 of the beam 5 are arranged so that the fixing length of the column 1 to the concrete 4 is different. The end of the first beam main reinforcement 6 is shorter than the second beam main reinforcement 7. When viewed from the side of the column 1, as shown in FIG. 1C, the fixing length of the second beam main bar 7 reaches almost the entire length of the cross section of the column 1, but the first beam main bar 6 has a fixed length. As shown in FIG. 1B, the fixing length is arranged so as to remain at about the middle part of the cross section of the column 1.
The fixing length of the first beam main reinforcement 6 and the second beam main reinforcement 7 to the concrete 4 is not limited to this, and the fixing length of the first beam main reinforcement 6 is almost the entire length of the cross section of the column 1. Further, the second beam main reinforcing bar 7 may be arranged so as to remain in about the middle part of the cross section of the column 1.
[0014]
According to the above-described configuration, in the joint structure between the column 1 and the beam 5, the end portion of the first beam main bar 6 constituting the beam 5 on the side to be joined to the column 1 is disposed inside the column 1. In this case, the first beam main reinforcement 6 is arranged so as to remain in about the middle part of the cross section of the column 1, while the second beam main reinforcement 7 is arranged so as to reach almost the entire length of the cross section of the column 1. Therefore, even if the fixing length of the first beam main reinforcement 6 to the concrete 4 is short, it is possible to prevent brittle fracture from occurring in the vicinity of the joint portion between the column 1 and the beam 5.
In addition, since the first beam main reinforcing bar 6 is disposed so that the end thereof stays about the middle part of the cross section of the column 1, when the entire structure is viewed as a whole, the amount of reinforcing bars can be greatly reduced. It becomes possible, and it becomes possible to greatly contribute to cost reduction.
Furthermore, since the reinforcing bars with heads are used for the first beam main reinforcing bar 6 and the second beam main reinforcing bar 7, the fixing strength to the concrete 4 can be increased as compared with hook reinforcing bars or the like that are generally used. When the joint structure of the pillar 1 and the beam 5 is viewed from the side, the cross section of the joint is simplified as shown in FIGS. It becomes possible to improve workability.
[0015]
In the present embodiment, for example, the joint structure of the pillar 1 and the beam 5 in the case where the beam 5 is joined only to one of the opposite side surfaces of the pillar 1 as seen in the outer periphery of the structure, for example, The fixing length of the second beam main reinforcing bar 7 disposed inward of the beam 5 is substantially the same as the length of the cross section of the column 1 similar to the conventional one, and the first beam arranged in the vicinity of the side surface of the beam 5. A configuration in which the fixing length of the main bar 6 is set to be approximately the middle part of the cross section of the column 1 and is shorter than that of the second beam main bar 7 is shown. Next, the joint structure of the column 1 and the beam 5 in the case where the beam 5 is joined to each of the opposite side surfaces of the column 1 as seen in, for example, the inside of the structure will be described in detail with reference to FIG. .
[0016]
(Second Embodiment)
As shown in FIG. 2A, the column 1 and the beams 5 and 5a are made of reinforced concrete as in the first embodiment, and the beams 5 and 5a are adjacent to each other with the column 1 interposed therebetween. They are arranged in pairs on the same axis. As in the first embodiment, the paired beams 5, 5a are arranged such that the first beam main bars 6 are spaced apart in parallel in the horizontal direction, and the second beam main bars 7 are A plurality of the first beam main bars 6 are arranged so as to be parallel to each other between the first beam main bars 6, and the combination of the first beam main bars 6 and the second beam main bars 7 is the beam 5, In the vicinity of the upper end surface and the lower end surface of 5a, they are arranged so as to be coaxial with a vertical axis. The length of the end of the first beam main reinforcement 6 is secured so as to be arranged at about the middle part of the cross section of the column 1, while the second beam main reinforcement 7 has a cross section of the column 1. The length is arranged so as to reach almost the entire length.
However, the plurality of second beam main bars 7 arranged between the paired first beam main bars 6 are spaced apart from one of the first beam main bars 6 and the adjacent second beam main bar 7. the L 1, after having taken smaller than the separation distance L 2 between the second beam main reinforcement 7 adjacent to the first beam main reinforcement 6 of the other, what was the second beam main reinforcement 7 at a predetermined interval apart Has been placed.
[0017]
The beam 5 provided with the first beam main reinforcing bar 6 and the second beam main reinforcing bar 7 has its end abutted against one side surface of the column 1, and the beam 5 is provided on the other side surface facing this. When the beams 5a rotated 180 degrees in plan view are abutted against each other, the beams 5 and 5a are arranged in pairs so as to be adjacent to each other with the column 1 interposed therebetween. In such a configuration, the ends of the first beam main bars 6 of the beams 5 and 5a that are paired across the column 1 face each other as shown in FIG. As shown in FIG. 2 (c), the end portions are always arranged with a predetermined distance (separation interval L 2 −separation interval L 1 ) without facing each other. As a result, the ends of the first beam main bars 6 of the beams 5 and 5a that make a pair are disposed so as to face each other inside the column 1 and the second beam main bars 7 The end portions are formed with a lap joint, and the concrete 4 of the column 1 is placed on the ends, whereby the column 1 and the beam 5 are joined.
[0018]
According to the above-described configuration, the end portions of the first beam main bars 6 arranged in the vicinity of the side surfaces of the pair of beams 5 are disposed so as to face each other inside the column 1. Since the ends of the second beam main bars 7 arranged inward of the paired beams 5 are arranged so as to form a misplaced array, the second beams 5 and 5a of the paired beams 5 and 5a are arranged. By arranging the end portions of the first beam main bar 6 so as to face each other, the second beam main bar 7 is formed with an overlapped joint, and the beams 5 adjacent to each other with the column 1 interposed therebetween are shifted in position. Can be arranged without facing each other, so that the work of bar arrangement is easy and the workability is improved, and the number of reinforcing bar joints can be greatly reduced, so that the cost can be greatly reduced. .
[0019]
By the way, the stress transmission to the column 1 of the beam 5 is caused by the adhesion of the straight portions at the ends of the first beam principal bar 6 and the second beam principal bar 7 disposed inside the column 1 to the concrete 4, This is done by the pressure bearing action of the end portion. Among these, the stress transmission due to the adhesion of the straight portions to the concrete 4 at the ends of the first beam main reinforcement 6 and the second beam main reinforcement 7 is likely to cause an adhesion split at the fixing portion. In order to cope with such a phenomenon, a case in which fiber reinforced concrete 10 is used for the joint portion of the column 1 where the end portions of the first beam main reinforcement 6 and the second beam main reinforcement 7 are disposed is used. This is shown in the third embodiment.
[0020]
(Third embodiment)
FIG. 3 shows a structure in which the beam 5 is joined to one of the opposite side surfaces of the pillar 1 using the pillar 1 and the beam 5 similar to those shown in the first embodiment. The fiber reinforced concrete 10 instead of the concrete 4 constituting the column 1 is provided only at the joint portion of the column 1 where the ends of the first beam principal bar 6 and the second beam principal bar 7 of the beam 5 are disposed. Is used. FIG. 4 shows the same structure as that shown in the second embodiment, with the columns 1 and the beams 5 and 5a arranged on the opposite side surfaces of the columns 1 on the same axis. Similarly, in these joint structures, the ends of the first beam main reinforcement 6 and the second beam main reinforcement 7 of the beams 5 and 5a are connected to the beams 5 and 5a of the column 1 on which the ends of the first beam main reinforcement 6 and the second beam main reinforcement 7 are arranged. A fiber reinforced concrete 10 is used instead of the concrete 4 constituting the pillar 1 only at the joint portion.
[0021]
The fiber reinforced concrete 10 is a mixture of a short fiber material made of metal or synthetic resin, and the main fiber material is any of steel fiber, glass fiber, polyethylene fiber, polypropylene fiber, aramid fiber, carbon fiber, etc. However, steel fibers are used in the present embodiment. The fiber reinforced concrete 10 is a material in which tensile strength, bending strength, impact resistance, toughness, adhesion performance, and the like are greatly improved as compared with ordinary concrete. In the present invention, this excellent adhesion performance is achieved. The fiber reinforced concrete 10 is applied to the joint portion of the column 1 with the beams 5 and 5a, and the split ends of the ends of the first beam main bar 6 and the second beam main bar 7 of the beams 5 and 5a are applied. Increases strength.
[0022]
According to the above-described configuration, the joining structure of the column 1 and the beam 5 and the column 1 and the beams 5 and 5a is such that the end portions of the first beam main bar 6 and the second beam main bar 7 of the beam 5 and 5a are connected to the column 1. In order to join the pillar 1 and the beam 5 by burying them using fiber reinforced concrete 10 instead of the concrete 4 only at the joint portion between the pillar 5 and the beams 5 and 5a, fiber reinforcement The adhesion performance of the concrete 10 can prevent the crack expansion that tends to occur around the first beam main reinforcement 6 and the second beam main reinforcement 7 and can increase the adhesion split strength.
[0023]
As described above, the stress transmission to the column 1 of the beam 5 is caused by the fiber reinforcement of the straight portion at the end portions of the first beam main bar 6 and the second beam main bar 7 disposed inside the column 1. It is carried out by adhesion to the concrete 10 and a support pressure action at the end portion. In the present embodiment, by using the fiber reinforced concrete 10 for the joint structure between the column 1 and the beam 5, the straight portions at the ends of the first beam main bar 6 and the second beam main bar 7 are connected to the fiber reinforced concrete 10. Since the adhesion is further strengthened, for example, it is possible to make the arrangement length to the column 1 shorter with respect to both ends of the first beam main bar 6 and the second beam main bar 7. Become.
Further, the second end portion of the main beam 7 arranged inside the beam 5 is inferior in adhesion strength as compared with the reinforcing bars with heads employed in the first to third embodiments. It is also possible to use a hook reinforcing bar having a bent portion, a straight reinforcing bar having no work at the end portion, or the like. In the fourth embodiment and the fifth embodiment, the fiber reinforced concrete 10 is applied to the joint structure of the column 1 and the beam 5, and a reinforcing bar different from the headed reinforcing bar is used for the second beam main bar 7. Here are some other cases.
[0024]
(Fourth embodiment)
As shown in FIGS. 5B and 5C, the column 1 and the beams 5 and 5a are made of reinforced concrete as in the second embodiment, but the first beam main reinforcement 6 of the beams 5 and 5a headed rebar, the second beam main reinforcement 7 end is using a linear straight rebar.
Further, as shown in FIG. 5A, the plurality of second beam main bars 7 arranged between the paired first beam main bars 6 are adjacent to one of the first beam main bars 6. The separation interval L 1 with the second beam main reinforcement 7 is set smaller than the separation interval L 2 between the other first beam reinforcement 6 and the adjacent second beam reinforcement 7. The beam main bars 7 are spaced apart from each other with a predetermined interval. The beam 5 provided with the first beam main reinforcing bar 6 and the second beam main reinforcing bar 7 has its end abutted against one side surface of the column 1, and the beam 5 is provided on the other side surface facing this. The beams 5a rotated 180 degrees in a plan view are abutted against each other, so that the beams 5 and 5a are arranged in pairs so as to be adjacent to each other with the column 1 in between.
[0025]
In such a configuration, the ends of the first beam main bars 6 of the beams 5 and 5a that are paired across the column 1 face each other as shown in FIG. As shown in FIG. 5 (c), the parts are always arranged alternately with a predetermined distance (separation interval L 2 −separation interval L 1 ) without facing each other. As a result, the ends of the first beam main bars 6 of the beams 5 and 5a that make a pair are disposed so as to face each other inside the column 1 and the second beam main bars 7 The end portions are formed with lap joints, and the fiber reinforced concrete 10 of the column 1 is placed on the ends, whereby the column 1 and the beam 5 are joined.
[0026]
According to the above-described configuration, since the fiber reinforced concrete 10 is applied to the joint structure of the column 1 and the beam 5, it is possible to use a linear reinforcing bar for the second beam main bar 7, and the bar arrangement is easy. Workability can be improved, and since it is not necessary to process the end portion of the second beam main reinforcing bar 7, it is possible to greatly contribute to the reduction in construction cost and the construction period.
[0027]
(Fifth embodiment)
As shown in FIGS. 6B and 6C, the column 1 and the beam 5 are made of reinforced concrete having the same configuration as that of the first embodiment, but the first beam main reinforcement 6 is a reinforcing bar with a head, A hook reinforcing bar in which the end portion of the second beam main bar 7 is bent is used. In the joining structure of the column 1 and the beam 5 having such a configuration, the end portions of the first beam principal bar 6 and the second beam principal bar 7 constituting the beam 5 on the side to be abutted with the side surface of the column 1 are arranged. By being arranged so as to be located inward of the pillar 1, the pillar 1 and the beam 5 are joined by being embedded in the fiber reinforced concrete 10 placed in the joint portion of the pillar 1 with the beam 5. It has a configuration. At this time, as shown in FIG. 6A, both the first beam principal bar 6 and the second beam principal bar 7 of the beam 5 are arranged with a short arrangement length inward of the column 1. When viewed from the side of the column 1, the arrangement length of the first beam main reinforcement 6 and the second beam main reinforcement 7 to the inside of the column 1 is shown in FIGS. 6 (b) and 6 (c). Thus, it arrange | positions so that it may remain in about the middle part of the cross section of the pillar 1.
[0028]
FIG. 7 shows an example in which the beams 5 described above are arranged in pairs on the same axis so as to be adjacent to each other with the column 1 interposed therebetween. The first beam main reinforcement 6 and the second beam main reinforcement 7 are arranged on the inner side of the column 1 so that the ends of the first beam main reinforcement 6 and the second beam main reinforcement 7 face each other in the vicinity of the middle portion of the cross section of the column. By placing the fiber reinforced concrete 10, the column 1 and the beam 5 are joined.
[0029]
According to the above-described configuration, when the beams 5 are arranged in pairs so as to be adjacent to each other with the column 1 interposed therebetween, the first beam main reinforcement 6 and the second beam main reinforcement 7 are arranged. Is arranged inside the column 1 so that the ends of each other face each other in the vicinity of the middle part of the cross section of the column, so that the arrangement can be simplified and the workability can be improved. At the same time, looking at the buildings as a whole, the amount of reinforcing bars can be greatly reduced, and the construction cost can be greatly reduced.
[0030]
【The invention's effect】
According to the pillar-to-beam joint structure according to claim 1, the first beam main reinforcing bar is formed of a rebar with a head portion having an enlarged diameter portion at a distal end portion, and forms a pair spaced apart so as to be parallel to the horizontal direction. And a second beam main bar comprising a rebar with a head similar to the first beam main bar, and a plurality of the second beam main bars that are spaced apart from each other so as to be parallel between the paired first beam main bars, A reinforced concrete beam provided to be coaxial in the vertical direction in both the vicinity of the upper end surface and the vicinity of the lower end surface, and a structure-to-column connection structure including a reinforced concrete column, the beam and the plane The beams rotated 180 degrees in view are arranged coaxially in pairs so as to be adjacent to each other across the column, and the first beam main reinforcement and the first beam of the beam on the side abutted against the side surface of the column The end of the beam main bar of 2 is buried in the concrete in a state of being arranged inside the column, And beams in a pair are bonded respectively, the first beam main reinforcements and said post length that is disposed inwardly of the second beam main reinforcement are, pillars said second beam main reinforcement constituting the beam length, wherein the first beam main reinforcement and a length of the substantially reached the middle of the cross section of the column, the fixing length in the concrete of the first beam main reinforcement of the second beam main reinforcement concrete of reaching substantially the entire length of the cross-section It is configured to be shorter than the fixing length. Thus, both the fixing length in the concrete of the first beam main reinforcement is shortened, the second beam main reinforcement from that disposed in the length to reach substantially the entire length of the cross-section of the column, joints of the columns and beams It is possible to prevent the occurrence of brittle fracture in the vicinity.
In addition, since the end of the first beam main bar is arranged so as to remain at about the middle part of the cross section of the column, it is possible to greatly reduce the amount of reinforcing bars when the entire structure is viewed as a whole. It is possible to greatly contribute to the reduction .
Furthermore, since the reinforcing bar with the head is used for the first beam main reinforcing bar and the second beam main reinforcing bar, the fixing strength to the concrete can be increased as compared with a hook reinforcing bar or the like that is generally used. At the same time, when the joint structure of the column and the beam is viewed from the side, the cross section of the joint is simplified, and the bar arrangement is easier and the workability can be improved.
[0031]
Further, according to the joint structure of columns and beams according to claim 1, wherein the separation distance between either one therewith and adjacent second beam main reinforcement of the first beam main reinforcements a pair of said beams, the other on which it is to reduce formation compared with separation distance between the first beam main reinforcement and a second beam main reinforcement adjacent thereto, and each other second beam main reinforcement is spaced at a predetermined interval, of said post Inwardly, the ends of the first beam main bars of the paired beams are arranged facing each other in a separated state, and the ends of the second beam main bars of the paired beams are arranged. Since the arrangement is made so as to form a misplacement arrangement, the ends of the first beam main bars of the pair of beams are arranged facing each other so that the second beam main bars are overlapped with each other. The adjacent beams across the pillars face each other without shifting their positions. It is possible to arrange, with Haisuji work is improved easy workability, since it is possible to significantly reduce the rebar joint, it is possible to significantly reduce costs.
[0032]
According to the joining structure of columns and beams according to claim 2, since the the concrete embedding the ends of the first beam main reinforcements and the second beam main reinforcement, fiber reinforced concrete is used, fiber reinforced The adhesion performance of concrete makes it possible to prevent crack expansion that tends to occur around the first beam principal bar and the second beam principal bar, and to increase the adhesion splitting strength.
[0033]
Further, by using fiber reinforced concrete for the joint structure between the column and the beam, the adhesion of the straight portions at the ends of the first beam main bar and the second beam main bar to the fiber reinforced concrete is further strengthened. The arrangement length to the column can be further shortened with respect to both of the end portions of the first beam main bar and the second beam main bar.
Moreover, it is also possible to use a hook reinforcing bar having a bent portion at the end portion or a straight reinforcing bar having no work at the end portion with respect to the second beam main reinforcing bar arranged inside the beam.
[0034]
According to the column-beam joint structure according to claim 3 , since the second beam reinforcing bar is a straight reinforcing bar with a straight end portion instead of the reinforcing bar with the head , it is easy to arrange the reinforcing bar. As a result, it is possible to improve the workability, and since it is not necessary to process the end portion of the second beam main reinforcement, it is possible to greatly contribute to the reduction of the construction cost and the construction period.
[0035]
According to the joint structure of a column and a beam according to claim 4, the first beam main reinforcing bar is formed of a rebar with a head having a diameter-expanded portion at a terminal portion, and forms a pair spaced apart so as to be parallel to the horizontal direction. And second rebar main bars which are made up of hook reinforcing bars whose end portions are bent and which are spaced apart from each other so as to be parallel to the first rebar main bars forming a pair. A reinforced concrete beam provided to be coaxial in the vertical direction near both end faces, and a column-to-beam joint structure of a structure having a reinforced concrete column, the side being abutted against the side of the column The end of the first beam main bar and the second beam main bar of the beam is embedded in the fiber reinforced concrete so that the column and the beam are joined to each other inside the column up to a substantially middle portion of the cross section. It is, before the fixing length of the fiber reinforced concrete of the first beam main reinforcement Is shorter than the fixing length of the fiber reinforced concrete of the second beam main reinforcement.
In addition, the beams are coaxially arranged in pairs so as to be adjacent to each other with a column interposed therebetween, and the ends of the first beam main bars of the pair of beams and Because the ends of the main beam bars of 2 are arranged facing each other in a separated state, the arrangement can be simplified and the workability can be improved. As a result, the construction cost can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a view showing a joint structure of a column and a beam according to the present invention.
FIG. 2 is a diagram showing a joint structure between a column and a beam when beams are arranged on both side surfaces facing each other across the column of the present invention.
FIG. 3 is a diagram showing a joint structure between a column and a beam when the fiber-reinforced concrete of the present invention is applied.
FIG. 4 is a diagram showing another example of a column-beam joint structure when the fiber-reinforced concrete of the present invention is applied.
FIG. 5 is a diagram showing a column-beam connection structure when the fiber-reinforced concrete of the present invention is applied and a linear reinforcing bar is used as the second beam main reinforcing bar of the beam.
FIG. 6 is a diagram showing a column-beam joint structure when the fiber-reinforced concrete of the present invention is applied and a hook reinforcing bar is used as the second beam main reinforcing bar of the beam.
FIG. 7 is a diagram showing another example of a column-beam joint structure when the fiber-reinforced concrete of the present invention is applied and a hook reinforcing bar is used as the second beam main reinforcing bar of the beam.
FIG. 8 is a diagram showing a conventional column-beam joint structure.
[Explanation of symbols]
1 Column 2 Main Bar 3 Strip Bar 4 Concrete 5 Beam 6 First Beam Main Bar 7 Second Beam Main Bar 8 Stirrup 9 Concrete 10 Fiber Reinforced Concrete 11 Beam 12 Main Bar 13 Column 14 Concrete

Claims (4)

末端部に拡径部を有する頭部付き鉄筋よりなり、水平方向に平行となるように離間配置される対をなす第１の梁主筋、
及び該第１の梁主筋と同様の頭部付き鉄筋よりなり、対をなす該第１の梁主筋の間でこれらと平行となるように複数が離間配置される第２の梁主筋が、
上端面近傍及び下端面近傍の両者に鉛直方向で同軸となるように備えられる鉄筋コンクリート造の梁と、
鉄筋コンクリート造の柱を備えた構造物の柱と梁の接合構造であって、
前記梁と平面視で 180 度回転した梁とが、柱を挟んで隣り合うように対をなして同軸上に配置されており、
前記柱の側面に突き合わされる側の前記梁の第１の梁主筋及び第２の梁主筋の端部が、柱の内方に配設される状態でコンクリートに埋設されて、柱と対をなす梁とがそれぞれ接合されており、
前記梁を構成する第１の梁主筋及び第２の梁主筋の前記柱の内方に配される長さが、前記第２の梁主筋を柱の断面の略全長に達する長さ、前記第１の梁主筋を柱の断面の略中間部に達する長さとし、前記第１の梁主筋のコンクリートへの定着長さを前記第２の梁主筋のコンクリートへの定着長さよりも短くしており、
前記梁の対をなす第１の梁主筋の何れか一方とこれと隣り合う第２の梁主筋との離間間隔が、他方の第１の梁主筋とこれと隣り合う第２の梁主筋との離間間隔と比較して小さく形成された上で、第２の梁主筋どうしが所定の間隔をもって離間配置されており、
前記柱の内方には、対をなす梁の第１の梁主筋の端部どうしが、分離された状態で向かい合わされて配設されているとともに、
対をなす梁の第２の梁主筋の端部どうしが、差し違え配列を形成するように配設されていることを特徴とする柱と梁の接合構造。A first beam main reinforcing bar comprising a pair of headed reinforcing bars having an enlarged diameter part at the end, and arranged in a pair so as to be parallel to the horizontal direction;
And a second beam main bar which is composed of a rebar with a head similar to the first beam main bar, and a plurality of the second beam main bars are arranged so as to be parallel to each other between the paired first beam main bars,
Reinforced concrete beams provided to be coaxial in the vertical direction near both the upper end surface and the lower end surface;
It is a joint structure between a pillar and a beam of a structure with a reinforced concrete pillar,
The beam and the beam rotated 180 degrees in plan view are arranged coaxially in a pair so as to be adjacent to each other with the column interposed therebetween,
The ends of the first beam main bar and the second beam main bar of the beam that are abutted against the side surface of the column are embedded in the concrete in a state of being disposed inward of the column, and are paired with the column . The eggplants are joined together,
First beam main reinforcement and a second of said column length that is disposed inwardly of the beam main reinforcement are long enough to reach the second beam main reinforcement substantially the entire length of the cross-section of the column constituting the beam, the first The first beam main bar has a length that reaches substantially the middle of the cross section of the column, and the fixing length of the first beam main bar to the concrete is shorter than the fixing length of the second beam main bar to the concrete,
The distance between any one of the first beam main bars forming a pair of beams and the second beam main bar adjacent to the first beam main bar is such that the other first beam main bar is adjacent to the second beam main bar adjacent to the second beam main bar. In addition to being formed smaller than the spacing interval, the second beam main bars are spaced apart from each other with a predetermined spacing.
On the inner side of the column, the ends of the first beam main bars of the pair of beams are arranged facing each other in a separated state,
A column-to-beam joint structure characterized in that ends of second beam main bars of a pair of beams are arranged so as to form a misplacement . 請求項１に記載の柱と梁の接合構造において、
前記第１の梁主筋及び第２の梁主筋の端部を埋設するコンクリートには、繊維補強コンクリートが用いられていることを特徴とする柱と梁の接合構造。In the junction structure of the pillar and beam of Claim 1 ,
A fiber-reinforced concrete is used for the concrete in which the end portions of the first beam main bar and the second beam main bar are embedded, and the column-to-beam joint structure. 請求項２に記載の柱と梁の接合構造において、
前記第２の梁鉄筋には、前記頭部付き鉄筋に代えて末端部が直線状の直線鉄筋が用いられることを特徴とする柱と梁の接合構造。In the junction structure of the pillar and beam of Claim 2 ,
Wherein the second beam rebar joint structure columns and beams that end in place of the head with reinforcing bars, characterized in that the linear straight rebar is used. 末端部に拡径部を有する頭部付き鉄筋よりなり、水平方向に平行となるように離間配置される対をなす第１の梁主筋、
及び末端部が折り曲げられたフック鉄筋よりなり、対をなす該第１の梁主筋の間でこれらと平行となるように複数が離間配置される第２の梁主筋が、
上端面近傍及び下端面近傍の両者に鉛直方向で同軸となるように備えられる鉄筋コンクリート造の梁と、
鉄筋コンクリート造の柱を備えた構造物の柱と梁の接合構造であって、
前記梁が、柱を挟んで隣り合うように対をなして同軸上に配置されており、
前記柱の側面に突き合わされる側の前記梁の第１の梁主筋及び第２の梁主筋の端部が、柱の内方で断面の略中間部まで配設される状態で柱の繊維補強コンクリートに埋設されて、柱と対をなす梁とがそれぞれ接合され、前記第１の梁主筋の繊維補強コンクリートへの定着長さを前記第２の梁主筋の繊維補強コンクリートへの定着長さよりも短くしており、
前記柱の内方には、対をなす梁の第１の梁主筋の端部どうし及び対をなす梁の第２の梁主筋の端部どうしが分離された状態で向かい合わされて配設されていることを特徴とする柱と梁の接合構造。A first beam main reinforcing bar comprising a pair of headed reinforcing bars having an enlarged diameter part at the end, and arranged in a pair so as to be parallel to the horizontal direction;
And a second beam main reinforcing bar which is formed of hook reinforcing bars whose end portions are bent, and a plurality of the second beam main reinforcing bars are arranged so as to be parallel to each other between the paired first beam main reinforcing bars.
Reinforced concrete beams provided to be coaxial in the vertical direction near both the upper end surface and the lower end surface;
It is a joint structure between a pillar and a beam of a structure with a reinforced concrete pillar,
The beams are arranged coaxially in pairs so as to be adjacent to each other with a pillar interposed therebetween,
Fiber reinforcement of the column in a state where the ends of the first and second beam main bars of the beam that are abutted against the side surface of the column are disposed inward of the column up to a substantially middle portion of the cross section. Beams embedded in concrete and paired with columns are joined to each other, and the fixing length of the first beam main reinforcement to the fiber reinforced concrete is larger than the fixing length of the second beam main reinforcement to the fiber reinforced concrete. Shortened,
The ends of the first beam main bars of the paired beams and the ends of the second beam main bars of the paired beams are arranged to face each other in an inward direction of the columns. joint structure of columns and beams, characterized in that there.
JP2002251359A 2002-08-29 2002-08-29 Column and beam joint structure Expired - Fee Related JP3826353B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002251359A JP3826353B2 (en) 2002-08-29 2002-08-29 Column and beam joint structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002251359A JP3826353B2 (en) 2002-08-29 2002-08-29 Column and beam joint structure

Publications (2)

Publication Number Publication Date
JP2004092051A JP2004092051A (en) 2004-03-25
JP3826353B2 true JP3826353B2 (en) 2006-09-27

Family

ID=32057962

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002251359A Expired - Fee Related JP3826353B2 (en) 2002-08-29 2002-08-29 Column and beam joint structure

Country Status (1)

Country Link
JP (1) JP3826353B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014055505A (en) * 2013-11-20 2014-03-27 Taisei Corp Column-beam frame with eccentricity and building formed from the frame

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4502270B2 (en) * 2005-09-08 2010-07-14 戸田建設株式会社 Joint structure of precast concrete beams
JP5503206B2 (en) * 2009-07-17 2014-05-28 株式会社竹中工務店 Incremental calculation method of fracture strength
JP6460952B2 (en) * 2015-09-30 2019-01-30 鹿島建設株式会社 Joining structure and joining method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014055505A (en) * 2013-11-20 2014-03-27 Taisei Corp Column-beam frame with eccentricity and building formed from the frame

Also Published As

Publication number Publication date
JP2004092051A (en) 2004-03-25

Similar Documents

Publication Publication Date Title
JP2010037911A (en) Joint structure of concrete member end
KR20100043731A (en) Precast concrete column using steel material and precast reinforced concrete construction using the same
JP3826353B2 (en) Column and beam joint structure
JP2017133277A (en) Column beam joining structure and column beam joining method
KR101490812B1 (en) Prefabricated steel frame with hoop reinforcement for composite member of steel and concrete
JP3759665B2 (en) Corner joints between reinforcing bars or steel reinforced concrete structures and various columnar structures and joining methods thereof
KR101274999B1 (en) Steel-concrete composite structure using lattice member and method for manufacturing the same
KR101496413B1 (en) Connecting Structure of Steel Pipe
JP6535704B2 (en) Column-beam frame
JP6508866B2 (en) Column-beam frame
JP3826354B2 (en) Column and beam joint structure
KR101622165B1 (en) Concrete filled steel tube
JP2007077628A (en) Joint structure of joint and its construction method
JPH09195444A (en) Reinforced concrete member
JP5095967B2 (en) Joint structure of column beam joint
JP2007211450A (en) Structure for joining precast column and steel-frame beam together
JP6764645B2 (en) Joint structure of structural members
JP4327694B2 (en) Connection structure
JP3879229B2 (en) Reinforced concrete beam structure
JPH09279859A (en) Joint structure between existing building and extension building
JP6862096B2 (en) Variable cross-section beam structure
JP2006322273A (en) Connecting structure
JP2017133278A (en) Column beam joining structure and column beam joining method
JPH04169625A (en) Joint structure
JP4968683B2 (en) Joint structure of precast concrete beams

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20040618

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20060213

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20060221

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20060424

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20060523

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20060622

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120714

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120714

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130714

Year of fee payment: 7

LAPS Cancellation because of no payment of annual fees