JP4347988B2

JP4347988B2 - Coupler

Info

Publication number: JP4347988B2
Application number: JP2000088857A
Authority: JP
Inventors: 武雄田口; 茂高島
Original assignee: カイエー共和コンクリート株式会社
Priority date: 2000-03-28
Filing date: 2000-03-28
Publication date: 2009-10-21
Anticipated expiration: 2020-03-28
Also published as: JP2001271425A

Description

【０００１】
【発明の属する技術分野】
本発明は、コンクリート構造物等の各種構築物をプレキャスト部材の連結によって構築する際に有用な連結器に関するものである。
【０００２】
【従来の技術】
例えば、水路や擁壁等のコンクリート構造物に関しては、単位部材であるプレキャストコンクリート部材を予め製作しておいて、これらを現場において組み立てる方法が採用されている。
【０００３】
プレキャストコンクリート部材を組み立てるには隣接するプレキャストコンクリート部材を連結するための連結器が必要で、その一例が特開昭６３−１１８４３３号公報に開示されている。同公報に開示されている連結器は、一方のＰＣ（プレキャストコンクリート）部材から突出する鋼棒に設けられた雄ネジ付きカプラーと、他方のＰＣ部材から突出する鋼棒に設けられた雌ネジ付きカプラーとを有しており、両カプラーを螺合する途中で各カプラーを各鋼棒のヘッド部に係合させ、これにより両鋼棒に引っ張り力を生じさせてＰＣ部材の連結を行う。
【０００４】
【発明が解決しようとする課題】
しかしながら、前述のものでは、カプラーの移動を制限するためのヘッド部が鋼棒に一体形成されているため、ＰＣ部材に鋼棒を埋設する際にカプラーを鋼棒に予め装着しておく必要がある。つまり、ＰＣ部材には鋼棒だけでなくカプラーも装着されているため、ＰＣ部材を輸送するときや組み立てるときにカプラーが邪魔になると共にカプラー及び鋼棒に変形や損傷を生じ得る可能性が高い。
【０００５】
この不具合を解決するには、前記のヘッド部を鋼棒に対して着脱自在とする方法が挙げられる。具体的には、ヘッド部をナットとし、鋼棒側にこのナットが螺合可能な雄ネジ部を形成しておけば、ＰＣ部材を組み立てる段階でカプラーを鋼棒に適宜取り付けることができる。
【０００６】
しかしながら、このような構成を採用すると、両カプラーを螺合するときにおいてカプラーがナットに係合した後にナットがカプラーと一緒に回転して鋼棒におけるナット位置にズレを生じてしまう恐れがある。とりわけ、水路や擁壁等のコンクリート構造物にあっては隣接するプレキャストコンクリート部材を高強度で連結する必要があることから、前記のような供回りが発生すると適正な引っ張り力を鋼棒に生じさせることが難しくなり、結果として所期の連結強度が得られなくなってしまう。
【０００７】
前記の供回りを防止するために両カプラーを螺合する前段階で溶接や接着等の手法によってナットを鋼棒に固着しておくことも考えられるが、現場における作業時間が増加すると共に固着のための設備や材料のコストも嵩んでしまう。
【０００８】
本発明は前記事情に鑑みて創作されたもので、プレキャスト部材の連結に所期の連結強度を確実に得ることができる連結器を提供することにある。
【０００９】
【課題を解決するための手段】
前記目的を達成するため、本発明の連結器は、第１ロッドがその先端の雄ネジ部が露出するように埋設された第１プレキャスト部材と、第２ロッドがその先端の雄ネジ部が露出するように埋設された第２プレキャスト部材とを、互いのロッドが向き合った状態で連結する際に用いられる連結器であって、第１ロッドの雄ネジ部に螺合可能な雌ネジ孔と締め付け用の雄ネジ部とを有し、雌ネジ孔に第１ロッドの雄ネジ部が螺合された状態で第１ロッドに配置され得る第１締付部材と、第２ロッドが余裕を持って挿入可能な挿通孔と第１締付部材の雄ネジ部に螺合可能な雌ネジ孔をナット当接面を介して連続して有し、挿通孔に第２ロッドの先端が挿入された状態で第２ロッドに配置され得る第２締付部材と、ナット当接面との当接によって第２締付部材の第２ロッド先端に向かう方向への移動を制限するために第２ロッドの雄ネジ部に螺合され得る制限ナットとを備え、第１締付部材の制限ナットと向き合う側には、第１締付部材の雄ネジ部に第２締付部材の雌ネジ孔を螺合するときに制限ナットの高さ方向の少なくとも一部が挿入可能な凹部から成り、且つ、挿入状態において制限ナットの側面角部と凹部の内面との相互当接によって該制限ナットの回転を抑制する回り止め部が形成されている、ことをその特徴とする。
【００１０】
この連結器によれば、第２ロッドに配置された第２締付部材を所定方向に回転させて、この第２締付部材の雌ネジ孔を第１ロッドに配置された第１締付部材の雄ネジ部に螺合することにより第１プレキャスト部材と第２プレキャスト部材の連結を行う。第１締付部材の制限ナットと向き合う側には、第１締付部材の雄ネジ部に第２締付部材の雌ネジ孔を螺合するときに制限ナットの高さ方向の少なくとも一部が挿入可能な凹部から成り、且つ、挿入状態において制限ナットの側面角部と凹部の内面との相互当接によって該制限ナットの回転を抑制する回り止め部が形成されているので、第１締付部材と第２締付部材とを螺合する過程において第２締付部材のナット当接面が制限ナットに当接した後に第２締付部材をさらに締め付けても、制限ナットは第２締付部材と一緒に回転することはなく、制限ナットの位置にズレを生じることもない。
【００１１】
本発明の前記目的とそれ以外の目的と、構成特徴と、作用効果は、以下の説明と添付図面によって明らかとなる。
【００１２】
【発明の実施の形態】
［第１実施形態］
図１〜図１０は本発明の第１実施形態を示すもので、図中の符号１１は第１プレキャスト部材、１２は第２プレキャスト部材、１３は第１ロッド、１４は第２ロッド、１５は第１締付部材、１６は第２締付部材、１７は制限ナット、１８は第１ロックナット、１９は第２ロックナットである。この第１実施形態では、第１締付部材１５，第２締付部材１６及び制限ナット１７によって第１プレキャスト部材１１と第２プレキャスト部材１２とを連結するための連結器が構成されている。
【００１３】
第１，第２プレキャスト部材１１，１２はコンクリート構造物を構築する際に用いられる単位部材であって、ここでは水路や擁壁等を構築する際に使用されるプレキャストコンクリート部材を示してある。第１プレキャスト部材１１の接合面１１ａの端部には、接合面側と表面側（図中の左面側）を開口した切欠部１１ｂが形成されており、第２プレキャスト部材１２の接合面１２ａの端部にも同様の切欠部１２ｂが切欠部１１ｂと向き合うように形成されている。
【００１４】
第１ロッド１３は雄ネジ部１３ａを先端に有しており、雄ネジ部１３ａが切欠部１１ｂ内で露出するように第１プレキャスト部材１１に埋設されている。第２ロッド１４も第１ロッド１３と同様の雄ネジ部１４ａを先端に有しており、雄ネジ部１４ｂが切欠部１２ｂ内で露出するように第２プレキャスト部材１２に埋設されている。各ロッド１３，１４は各プレキャスト部材１１，１２を成型する際に予め型枠内にセットされ、各プレキャスト部材１１，１２と一体に製作されている。各ロッド１３，１４の径と雄ネジ部１３ａ，１４ａの長さ，ネジ向き及びネジピッチは同じで、また、切欠部１１ｂ内における第１ロッド１３の突出長さと切欠部１２ｂ内における第２ロッド１４の突出長さはほぼ同じで接合面１１ａ，１２ａ迄は達していない。各ロッド１３，１４のプレキャスト部材内に埋設される部分の表面には、各ロッド１３，１４に所定の引っ張り強度が得られるように必要に応じて凹凸（図示省略）が形成されている。勿論、各ロッド１３，１４は、プレキャスト部材内に設けられた鉄筋の一部、例えば主筋で代用してもよいし、内部鉄筋と溶接等によって結合されていてもよい。
【００１５】
第１締付部材１５は、全体が略円柱状を成していて、一端面（図中の下端面）の中央には、第１ロッド１３の雄ネジ部１３ａに螺合可能な雄ネジ孔１５ａが形成されている。また、第１締付部材１５の外周面には、後述する雌ネジ孔１６ｂに螺合可能な雄ネジ部１５ｂが形成されている。さらに、第１締付部材１５の一端側（図中の下端側）の外周にはフランジ１５ｃが形成されており、第１締付部材１５の一端面の外周部分には、図２（Ｂ）にも示すように、第１締付部材１５と第２締付部材１６とを螺合する際に工具を係合させるための歯輪状部１５ｄ（矩形溝が周方向の等角度間隔で並んだもの）が形成されている。
【００１６】
さらにまた、第１締付部材１５の他端面（図中の上端面）には、制限ナット１７の高さ方向の少なくとも一部が挿入可能な第１凹部１５ｅが形成され、その中央には、第２ロッド１４の雄ネジ部１４ａの先端を受け入れるための第２凹部１５ｆが形成されている。図２（Ａ）にも示すように、第１凹部１５ｅの横断面形は、制限ナット１７よりも僅かに大きな２つの６角形を３０度の角度差をもって重ねたような形状、即ち、１２個の角部を３０度間隔で有する形状をしている。つまり、図３に実線で示すように、制限ナット１７はその側面角部の向きが第１凹部１５ｅの内面角部と整合して状態において第１凹部１５ｅ内に入り込むことできるが、挿入状態において図３に２点鎖線で示す向きに回転しようとしても制限ナット１７の側面角部が第１凹部１５ｅの内面と当接するためそれ以上は回転することができない。要するに、第１凹部１５ｅは制限ナット１７の回り止め部としての機能を果たす。
【００１７】
第２締付部材１６は、全体が略円柱状を成していて、一端面（図中の上端面）の中央には、第２ロッド１４が余裕をもって挿入可能な挿通孔１６ａが形成されている。また、第２締付部材１６の他端面（図中の下端面）には、第１締付部材１５の雄ネジ部１５ａに螺合可能な雌ネジ孔１６ｂが形成されている。挿通孔１６ａは雌ネジ孔１６ｂよりも径が小さく、図４（Ａ）にも示すように、両者は環状のナット当接面１６ｃを介して連続している。さらに、第２締付部材１６の一端面の外周部分には、図４（Ｂ）にも示すように、第１締付部材１５と第２締付部材１６とを螺合する際に工具を係合させるための歯輪状部１６ｄ（矩形溝が周方向の等角度間隔で並んだもの）が形成されている。
【００１８】
制限ナット１７は、第２締付部材１６の挿通孔１６ａよりも径が大きく、且つ、雌ネジ孔１６ｂよりも径が小さな６角ナットから成る。第１ロックナット１８及び第２ロックナット１９も制限ナット１７と同様の６角ナットから成る。
【００１９】
前記の連結器を用いて第１プレキャスト部材１１と第２プレキャスト部材１２とを連結するときには、まず、図５に示すように、第１プレキャスト部材１１の接合面１１ａと第２プレキャスト部材１２の接合面１２ａを当接させる前に、第１ロッド１３の雄ネジ部１３ａに第１ロックナット１８を限界位置近くまで螺合すると共に、雄ネジ部１３ａに第１締付部材１５の雌ネジ孔１５ａを限界位置近くまで螺合する。また、第２ロッド１４の雄ネジ部１４ａに第２ロックナット１９を限界位置近くまで螺合すると共に、同雄ネジ部１４ａに第２締付部材１６の挿通孔１６ａを挿入してから、雄ネジ部１４ａの先端に制限ナット１７を螺合する。図５から分かるように制限ナット１７を雄ネジ部１４ａに螺合するときには雄ネジ部１４ａの先端が制限ナット１７から僅かに突出するようにする。これら作業は簡単なねじ回し作業であるため工具等を用いずに行うことができる。
【００２０】
次に、図６に示すように、クレーン等を利用して第１プレキャスト部材１１と第２プレキャスト部材１２の少なくとも一方を移動させ、互いの切欠部１１ｂと１２ｂが整合するように第１プレキャスト部材１１の接合面１１ａと第２プレキャスト部材１２の接合面１２ａを当接させ、第１ロッド１３と第２ロッド１４とを向き合わせる。これにより、第２ロッド１４の雄ネジ部１４ａの先端に取り付けられている制限ナット１７の高さ方向の少なくとも一部が第１締付部材１５の第１凹部１５ｅ内に挿入し、雄ネジ部１４ａの制限ナット１７よりも突出する部分が第２凹部１５ｆ内に挿入する。制限ナット１７の側面角部が第１凹部１５ｅの内面角部と必ずしも整合していなくとも第１凹部１５ｅ内への制限ナット１７の挿入は可能である。つまり、制限ナット１７はその端面の丸みが第１凹部１５ｅの開口縁と接触することによって自らが僅かな角度回転するため、制限ナット１７の第１凹部１５ｅ内への挿入はスムースに行える。
【００２１】
次に、図７に示すように、第１締付部材１５の歯輪状部１５ｄと第２締付部材１６の歯輪状部１６ｄのそれぞれに工具を係合し、第１締付部材１５を固定した状態で第２締付部材１６を所定方向（図中は右回り方向）に回転させ、第２締付部材１６の雌ネジ孔１６ａを第１締付部材１５の雄ネジ部１５ａに螺合する。螺合が進んで第２締付部材１６のナット当接面１６ｃが制限ナット１７に当接すると、第１ロッド１３と第２ロッド１４に引っ張り力が生じ、第１プレキャスト部材１１の接合面１１ａと第２プレキャスト部材１２の接合面１２ａとが密着して両プレキャスト部材１１，１２が連結される。ちなみに、第２締付部材１６の挿通孔１６ａの径が第２ロッド１４の雄ネジ部１４ａの径よりも大きいため、第２ロッド１３と第２ロッド１４の軸線にズレがある場合でも、挿通孔１６ａと雄ネジ部１４ａとの隙間を利用して第２締付部材１６を動かすことにより、前記の螺合作業を支障なく行うことができる。
【００２２】
先に説明したように、第１締付部材１５と第２締付部材１６とを螺合する段階では、既に制限ナット１７が第１締付部材１５の第１凹部１５ｅ内に挿入されているため、第２締付部材１６のナット当接面１６ｃが制限ナット１７に当接した後に第２締付部材１６をさらに締め付けても、制限ナット１７は第１凹部１５ｅとのクリアランスを僅かに回転するだけでそれ以上回転することはなく、側面角部と第１凹部１５ｅの内面との相互当接によって回転を抑制される。
【００２３】
次に、図８に示すように、第１ロックナット１８と第２ロックナット１９をそれぞれが第１締付部材１５と第２締付部材１６に当接するまで指先で回し、当接後は工具を用いて第１ロックナット１８を第１締付部材１５に締め付け、第２ロックナット１９を第２締付部材１６に締め付ける。
【００２４】
次に、第１プレキャスト部材１１の切欠部１１ｂと第２プレキャスト部材１２の切欠部１２ｂに硬化材、例えばモルタルと樹脂との混合物から成る強化モルタルを充填して硬化させる。
【００２５】
このように、前述の連結器によれば、第２ロッド１４の雄ネジ部１４ａの先端に取り付けられている制限ナット１７を第１締付部材１５の第１凹部１５ｅ内に挿入することにより制限ナット１７の回転を的確に抑制することができるので、第１締付部材１５と第２締付部材１６とを螺合する過程において第２締付部材１６のナット当接面１６ｃが制限ナット１７に当接した後に第２締付部材１６をさらに締め付けても、制限ナット１７は第１凹部１５ｅとのクリアランスを僅かに回転するだけでそれ以上回転することはない。
【００２６】
つまり、制限ナット１７の供回りを原因として第２ロッド１４における制限ナット１７の位置がロッド軸方向にずれてしまうことを確実に防止して、適正な引っ張り力を第１，第２ロッド１３，１４に生じさせ、これにより第１プレキャスト部材１１と第２プレキャスト部材１２との連結に所期の連結強度を確実に得ることができる。
【００２７】
また、前述のプレキャスト部材連結構造体によれば、第１プレキャスト部材１１と第２プレキャスト部材１２とを高強度で連結でき、しかも、連結箇所が複数ある場合でも各々の連結強度にばらつきを生じることを確実に防止できることから、水路や擁壁等のコンクリート構造物を堅牢なものとできると共に、構築時間の短縮化及び構築作業の簡便化に大きく貢献することができる。
【００２８】
尚、前述の説明では、第１凹部１５ｅとして１２個の角部を３０度間隔で有する横断面形状のものを示したが、図９（Ａ）に示すように２４個の角部を１５度間隔で有する横断面形状のものを第１凹部１５ｅ１として用いてもよく、また、図９（Ｂ）に示すように６個の角部を６０度間隔で有する制限ナット１７と相似形の横断面形状のものを第１凹部１５ｅ２として用いてもよい。図９（Ａ）に示した第１凹部１５ｅ１のように角部の数を増加させれば制限ナット１７の第１凹部１５ｅ１内への挿入をよりスムースに行うことができるが、角部の数を増加し過ぎると第１凹部の横断面形状が円形に近いものとなって所期の回り止めの効果が得られなくなるので角部増加にも限界はある。図９（Ｂ）に示した第１凹部１５ｅ２の場合には、制限ナット１７の側面角部と第１凹部１５ｅ２の内面角部との間に最大で３０度の角度差を生じ得るため、第１プレキャスト部材１１の接合面１１ａと第２プレキャスト部材１２の接合面１２ａを当接させる前段階で、制限ナット１７と第１締付部材１５の第１凹部１５ｅ２の位置関係を目視にて確認し、制限ナット１７と第１締付部材１５の何れか一方を回転させて両者の位置合わせを事前に行う。
【００２９】
また、前述の説明では、制限ナット１７として６角ナットを用いたものを示したが、図１０（Ｂ）に示すような４角ナットを制限ナット１７ａとして用いてもよい。この場合も前記と同様に、図１０（Ｃ）に示すように第１凹部１５ｅ３の横断面形状を制限ナット１７ａよりも僅かに大きな四角形としたり、或いは、制限ナット１７ａよりも僅かに大きな２つの４角形を４５度の角度差をもって重ねた形状や、４つの四角形を２２．５度の角度差で重ねた形状としてもよい。
【００３０】
さらに、前述の説明では、第１締付部材１５と第２締付部材１６のそれぞれに工具係合用の歯輪状部１５ｄ，１６ｄを設けたものを示したが、歯輪状部１５ｄ，１６ｄの代わりに６角状部や４角状部を設けてここに工具を係合させるようにしてもよい。
【００３１】
［第２実施形態］
図１１及び図１２は本発明の第２実施形態を示すもので、図中の符号２１は第１プレキャスト部材、２１ａは接合面、２１ｂは切欠部、２２は第２プレキャスト部材、２２ａは接合面、２２ｂは切欠部、２３は第１ロッド、２３ａは雄ネジ部、２４は第２ロッド、２４ａは雄ネジ部、２５は第１締付部材、２５ａは雌ネジ孔、２５ｂは雄ネジ部、２５ｃはフランジ、２５ｄは歯輪状部、２６は第２締付部材、２６ａは挿通孔、２６ｂは雌ネジ孔、２６ｃはナット当接面、２６ｄは歯輪状部、２７は制限ナット、２８は第１ロックナット、２９は第２ロックナットである。この第２実施形態では、第１締付部材２５，第２締付部材２６及び制限ナット２７によって第１プレキャスト部材２１と第２プレキャスト部材２２とを連結するための連結器が構成されている。
【００３２】
本第２実施形態が、前述の第１実施形態と異なるところは、第１実施形態の第１凹部１５ｅと同じ横断面形で深さ寸法が大きな凹部２５ｅを第１締付部材２５に設けた点と、第１実施形態のような第２凹部１５ｆを排除した点と、制限ナット２７として高さ寸法の大きなものを用いた点にある。他の構成は第１実施形態と同じであるため説明を省略する。
【００３３】
前記の連結器を用いて第１プレキャスト部材２１と第２プレキャスト部材２２とを連結するときには、まず、第１プレキャスト部材２１の接合面２１ａと第２プレキャスト部材２２の接合面２２ａを当接させる前に、第１ロッド２３の雄ネジ部２３ａに第１ロックナット２８を限界位置近くまで螺合すると共に、雄ネジ部２３ａに第１締付部材２５の雌ネジ孔２５ａを限界位置近くまで螺合する。また、第２ロッド２４の雄ネジ部２４ａに第２ロックナット２９を限界位置近くまで螺合すると共に、同雄ネジ部２４ａに第２締付部材２６の挿通孔２６ａを挿入してから、雄ネジ部２４ａの先端に制限ナット２７を螺合する。図１２から分かるように制限ナット２７を雄ネジ部２４ａに螺合するときには雄ネジ部２４ａの先端が制限ナット２７から突出しないようにする。これら作業は簡単なねじ回し作業であるため工具等を用いずに行うことができる。
【００３４】
次に、クレーン等を利用して第１プレキャスト部材２１と第２プレキャスト部材２２の少なくとも一方を移動させ、互いの切欠部２１ｂと２２ｂが整合するように第１プレキャスト部材２１の接合面２１ａと第２プレキャスト部材２２の接合面２２ａを当接させ、第１ロッド２３と第２ロッド２４とを向き合わせる。これにより、第２ロッド２４の雄ネジ部２４ａの先端に取り付けられている制限ナット２７の高さ方向の少なくとも一部が第１締付部材２５の凹部２５ｅ内に挿入する。制限ナット２７の側面角部が凹部２５ｅの内面角部と必ずしも整合していなくとも凹部２５ｅ内への制限ナット２７の挿入は可能である。つまり、制限ナット２７はその端面の丸みが凹部２５ｅの開口縁と接触することによって自らが僅かな角度回転するため、制限ナット２７の凹部２５ｅ内への挿入はスムースに行える。
【００３５】
次に、第１締付部材２５の歯輪状部２５ｄと第２締付部材２６の歯輪状部２６ｄのそれぞれに工具を係合し、第１締付部材２５を固定した状態で第２締付部材２６を所定方向（図中は右回り方向）に回転させ、第２締付部材２６の雌ネジ孔２６ａを第１締付部材２５の雄ネジ部２５ａに螺合する。螺合が進んで第２締付部材２６のナット当接面２６ｃが制限ナット２７に当接すると、第１ロッド２３と第２ロッド２４に引っ張り力が生じ、第１プレキャスト部材２１の接合面２１ａと第２プレキャスト部材２２の接合面２２ａとが密着して両プレキャスト部材２１，２２が連結される。ちなみに、第２締付部材２６の挿通孔２６ａの径が第２ロッド２４の雄ネジ部２４ａの径よりも大きいため、第２ロッド２３と第２ロッド２４の軸線にズレがある場合でも、挿通孔２６ａと雄ネジ部２４ａとの隙間を利用して第２締付部材２６を動かすことにより、前記の螺合作業を支障なく行うことができる。
【００３６】
先に説明したように、第１締付部材２５と第２締付部材２６とを螺合する段階では、既に制限ナット２７が第１締付部材２５の凹部２５ｅ内に挿入されているため、第２締付部材２６のナット当接面２６ｃが制限ナット２７に当接した後に第２締付部材２６をさらに締め付けても、制限ナット２７は凹部２５ｅとのクリアランスを僅かに回転するだけでそれ以上回転することはなく、側面角部と凹部２５ｅの内面との相互当接によって回転を抑制される。
【００３７】
次に、第１ロックナット２８と第２ロックナット２９をそれぞれが第１締付部材２５と第２締付部材２６に当接するまで指先で回し、当接後は工具を用いて第１ロックナット２８を第１締付部材２５に締め付け、第２ロックナット２９を第２締付部材２６に締め付ける。
【００３８】
次に、第１プレキャスト部材２１の切欠部２１ｂと第２プレキャスト部材２２の切欠部２２ｂに硬化材、例えばモルタルと樹脂との混合物から成る強化モルタルを充填して硬化させる。
【００３９】
このように、前述の連結器によれば、第２ロッド２４の雄ネジ部２４ａの先端に取り付けられている制限ナット２７を第１締付部材２５の凹部２５ｅ内に挿入することにより制限ナット２７の回転を的確に抑制することができるので、第１締付部材２５と第２締付部材２６とを螺合する過程において第２締付部材２６のナット当接面２６ｃが制限ナット２７に当接した後に第２締付部材２６をさらに締め付けても、制限ナット２７は凹部２５ｅとのクリアランスを僅かに回転するだけでそれ以上回転することはない。
【００４０】
つまり、制限ナット２７の供回りを原因として第２ロッド２４における制限ナット２７の位置がロッド軸方向にずれてしまうことを確実に防止して、適正な引っ張り力を第１，第２ロッド２３，２４に生じさせ、これにより第１プレキャスト部材２１と第２プレキャスト部材２２との連結に所期の連結強度を確実に得ることができる。
【００４１】
また、前述のプレキャスト部材連結構造体によれば、第１プレキャスト部材２１と第２プレキャスト部材２２とを高強度で連結でき、しかも、連結箇所が複数ある場合でも各々の連結強度にばらつきを生じることを確実に防止できることから、水路や擁壁等のコンクリート構造物を堅牢なものとできると共に、構築時間の短縮化及び構築作業の簡便化に大きく貢献することができる。
【００４２】
尚、前述の説明では、凹部２５ｅとして１２個の角部を３０度間隔で有する横断面形状のものを示したが、第１実施形態で説明した第１凹部のような横断面形状を有する凹部を採用しても構わない。また、制限ナットとして６角ナットを示したが、第１実施形態で説明したような四角ナットを用い、これに応じて凹部の横断面形状をアレンジしても構わない。
【００４３】
また、前述の説明では、第１締付部材２５と第２締付部材２６のそれぞれに工具係合用の歯輪状部２５ｄ，２６ｄを設けたものを示したが、歯輪状部２５ｄ，２６ｄの代わりに６角状部や４角状部を設けてここに工具を係合させるようにしてもよい。
【００４４】
以上の第１〜第２実施形態では、水路や擁壁等のコンクリート構造物を構築する際に用いられるプレキャストコンクリート部材の連結に本発明を適用したが、本発明は、プレハブ住宅やビルディング等の建物を構築するときや他の構築用途においてプレキャスト部材を連結する際に幅広く適用できる。
【００４５】
【発明の効果】
以上詳述したように、本発明によれば、第１締付部材と第２締付部材とを螺合する過程において制限ナットの供回りを原因として第２ロッドにおける制限ナットの位置がロッド軸方向にずれてしまうことを確実に防止して、適正な引っ張り力を第１，第２ロッドに生じさせ、これにより第１プレキャスト部材と第２プレキャスト部材との連結に所期の連結強度を確実に得ることができる。
【図面の簡単な説明】
【図１】本発明の第１実施形態に係る連結器及びプレキャスト部材の縦断面図
【図２】図１に示した第１締付部材の上面図と下面図
【図３】図１に示した第１締付部材の第１凹部に制限ナットが入り込んだ状態を示す図
【図４】図１に示した第２締付部材の下面図及び上面図
【図５】第１実施形態に係る連結動作の説明図
【図６】第１実施形態に係る連結動作の説明図
【図７】第１実施形態に係る連結動作の説明図
【図８】第１実施形態に係る連結動作の説明図
【図９】図１に示した第１締付部材の第１凹部の変形例を示す図
【図１０】図１に示した第１締付部材の第１凹部とナットの変形例を示す図と、第１凹部にナットが入り込んだ状態を示す図
【図１１】本発明の第２実施形態に係る連結器及びプレキャスト部材の縦断面図
【図１２】第２実施形態に係る連結後の状態を示す図
【符号の説明】
１１…第１プレキャスト部材、１２…第２プレキャスト部材、１３…第１ロッド、１３ａ…雄ネジ部、１４…第２ロッド、１４ａ…雄ネジ部、１５…第１締付部材、１５ａ…雌ネジ孔、１５ｂ…雄ネジ部、１５ｅ，１５ｅ１，１５ｅ２，１５ｅ３…凹部、１６…第２締付部材、１６ａ…挿通孔、１６ｂ…雌ネジ孔、１６ｃ…ナット当接面、１７，１７ａ…制限ナット、２１…第１プレキャスト部材、２２…第２プレキャスト部材、２３…第１ロッド、２３ａ…雄ネジ部、２４…第２ロッド、２４ａ…雄ネジ部、２５…第１締付部材、２５ａ…雌ネジ孔、２５ｂ…雄ネジ部、２５ｅ…凹部、２６…第２締付部材、２６ａ…挿通孔、２６ｂ…雌ネジ孔、２６ｃ…ナット当接面、２７…制限ナット。[0001]
BACKGROUND OF THE INVENTION
  The present invention is useful for connecting various structures such as concrete structures by connecting precast members.In a vesselIt is related.
[0002]
[Prior art]
  For example, with respect to concrete structures such as water channels and retaining walls, a method is adopted in which precast concrete members, which are unit members, are produced in advance and assembled on site.
[0003]
  In order to assemble a precast concrete member, a coupler for connecting adjacent precast concrete members is required, and an example thereof is disclosed in Japanese Patent Laid-Open No. 63-118433. The coupler disclosed in the publication has a male threaded coupler provided on a steel bar protruding from one PC (precast concrete) member, and a female thread provided on a steel bar protruding from the other PC member. Each coupler is engaged with the head portion of each steel bar in the middle of screwing both couplers, thereby generating a pulling force on both steel bars to connect the PC members.
[0004]
[Problems to be solved by the invention]
  However, in the above-mentioned, since the head part for restricting the movement of the coupler is formed integrally with the steel rod, it is necessary to attach the coupler to the steel rod in advance when embedding the steel rod in the PC member. is there. In other words, since not only a steel rod but also a coupler is mounted on the PC member, when the PC member is transported or assembled, there is a high possibility that the coupler will become an obstacle and the coupler and the steel rod may be deformed or damaged. .
[0005]
  In order to solve this problem, there is a method in which the head portion is detachable from the steel rod. Specifically, if the head portion is a nut and a male screw portion on which the nut can be screwed is formed on the steel rod side, the coupler can be appropriately attached to the steel rod at the stage of assembling the PC member.
[0006]
  However, when such a configuration is adopted, there is a risk that when the two couplers are screwed together, the nut rotates together with the coupler after the coupler is engaged with the nut and the nut position on the steel rod is displaced. In particular, in concrete structures such as waterways and retaining walls, it is necessary to connect adjacent precast concrete members with high strength. As a result, the desired connection strength cannot be obtained.
[0007]
  In order to prevent the above-mentioned rotation, it is conceivable to fix the nut to the steel rod by welding, bonding or the like before screwing the two couplers. The cost of the equipment and materials for this will also increase.
[0008]
  The present invention was created in view of the above circumstances, and a connection that can reliably obtain the desired connection strength for the connection of the precast member.VesselIt is to provide.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, the coupler of the present invention includes a first precast member in which the first rod is embedded so that the male screw portion at the tip thereof is exposed, and the second rod is exposed at the tip of the male screw portion. A connector used when connecting the second precast member embedded so as to face each other with the rods facing each other, and is tightened with a female screw hole that can be screwed into the male screw portion of the first rod A first tightening member that can be disposed on the first rod in a state where the male screw portion of the first rod is screwed into the female screw hole, and the second rod has a margin. A state in which an insertable insertion hole and a female screw hole that can be screwed into the male screw portion of the first tightening member are continuously provided via a nut contact surface, and the tip of the second rod is inserted into the insertion hole The second tightening member that can be disposed on the second rod and the nut abutting surface makes contact with the second tightening member. And a limit nut may screwed onto the male screw portion of the second rod to restrict movement in the direction towards the second rod end of the biasing member,On the side facing the limiting nut of the first tightening member, at least a part of the limiting nut in the height direction is threaded when the female screw hole of the second tightening member is screwed into the male screw portion of the first tightening member. An anti-rotation portion is formed which is composed of a recess that can be inserted, and suppresses the rotation of the limit nut by mutual contact between the side corner portion of the limit nut and the inner surface of the recess in the inserted state.It is characterized by that.
[0010]
  According to this connector, the second tightening member disposed on the second rod is rotated in a predetermined direction, and the female screw hole of the second tightening member is disposed on the first rod. The first precast member and the second precast member are connected by being screwed to the male screw portion.On the side facing the limiting nut of the first tightening member, at least a part of the limiting nut in the height direction is threaded when the female screw hole of the second tightening member is screwed into the male screw portion of the first tightening member. An anti-rotation portion is formed which is composed of a recess that can be inserted and suppresses rotation of the limit nut by mutual contact between the side corner portion of the limit nut and the inner surface of the recess in the inserted state.Therefore, even if the second tightening member is further tightened after the nut abutting surface of the second tightening member abuts on the limit nut in the process of screwing the first tightening member and the second tightening member, there is a restriction. The nut does not rotate with the second tightening member, and the position of the limit nut does not shift.
[0011]
  The above object and other objects, structural features, and operational effects of the present invention will become apparent from the following description and the accompanying drawings.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
  [First Embodiment]
  FIGS. 1-10 shows 1st Embodiment of this invention, the code | symbol 11 in a figure is the 1st precast member, 12 is the 2nd precast member, 13 is the 1st rod, 14 is the 2nd rod, 15 is A first tightening member, 16 is a second tightening member, 17 is a limiting nut, 18 is a first lock nut, and 19 is a second lock nut. In the first embodiment, a coupler for connecting the first precast member 11 and the second precast member 12 is constituted by the first tightening member 15, the second tightening member 16 and the limiting nut 17.
[0013]
  The first and second precast members 11 and 12 are unit members used when constructing a concrete structure, and here, precast concrete members used when constructing a water channel and a retaining wall are shown. At the end of the joint surface 11 a of the first precast member 11, a notch portion 11 b is formed that opens on the joint surface side and the surface side (left surface side in the drawing). A similar notch 12b is also formed at the end so as to face the notch 11b.
[0014]
  The first rod 13 has a male screw portion 13a at the tip, and is embedded in the first precast member 11 so that the male screw portion 13a is exposed in the notch portion 11b. The second rod 14 also has a male screw portion 14a similar to that of the first rod 13 at the tip, and is embedded in the second precast member 12 so that the male screw portion 14b is exposed in the cutout portion 12b. The rods 13 and 14 are set in advance in the mold when the precast members 11 and 12 are molded, and are manufactured integrally with the precast members 11 and 12. The diameters of the rods 13 and 14 and the lengths, screw directions and screw pitches of the male screw portions 13a and 14a are the same, and the protruding length of the first rod 13 in the notch portion 11b and the second rod 14 in the notch portion 12b. The projecting lengths of are substantially the same and do not reach the joint surfaces 11a and 12a. Concavities and convexities (not shown) are formed on the surfaces of the portions embedded in the precast members of the rods 13 and 14 as necessary so that the rods 13 and 14 have a predetermined tensile strength. Of course, each of the rods 13 and 14 may be replaced with a part of a reinforcing bar provided in the precast member, for example, a main reinforcing bar, or may be connected to the internal reinforcing bar by welding or the like.
[0015]
  The first tightening member 15 has a substantially cylindrical shape as a whole, and has a male screw hole that can be screwed into the male screw portion 13a of the first rod 13 at the center of one end surface (lower end surface in the drawing). 15a is formed. A male screw portion 15b that can be screwed into a female screw hole 16b described later is formed on the outer peripheral surface of the first tightening member 15. Further, a flange 15c is formed on the outer periphery of one end side (the lower end side in the drawing) of the first tightening member 15, and the outer peripheral portion of the one end face of the first tightening member 15 isAs shown in FIG.An annular portion 15d (rectangular grooves arranged at equal angular intervals in the circumferential direction) for engaging a tool when the first fastening member 15 and the second fastening member 16 are screwed together is formed. Yes.
[0016]
  Furthermore, a first recess 15e into which at least a part in the height direction of the limiting nut 17 can be inserted is formed on the other end surface (the upper end surface in the drawing) of the first tightening member 15, and at the center thereof, Second recess 15 for receiving the tip of male screw portion 14a of second rod 14fIs formed. As shown in FIG. 2A, the cross-sectional shape of the first recess 15e is such that two hexagons slightly larger than the limiting nut 17 are stacked with an angle difference of 30 degrees, that is, 12 pieces. The shape has a corner portion at an interval of 30 degrees. That is, as shown by the solid line in FIG. 3, the limiting nut 17 can enter the first recess 15e in a state in which the direction of the side corner is aligned with the inner corner of the first recess 15e. Even if an attempt is made to rotate in the direction indicated by a two-dot chain line in FIG. In short, the first recess 15e functions as a rotation stopper for the limiting nut 17.
[0017]
  The entire second tightening member 16 has a substantially cylindrical shape, and an insertion hole 16a into which the second rod 14 can be inserted with a margin is formed at the center of one end surface (the upper end surface in the figure). Yes. A female screw hole 16 b that can be screwed into the male screw portion 15 a of the first tightening member 15 is formed on the other end surface (lower end surface in the drawing) of the second tightening member 16. The insertion hole 16a has a smaller diameter than the female screw hole 16b, and as shown in FIG. 4A, both are continuous via an annular nut contact surface 16c. Further, as shown in FIG. 4B, a tool is used on the outer peripheral portion of the one end surface of the second fastening member 16 when the first fastening member 15 and the second fastening member 16 are screwed together. A tooth ring-like portion 16d (with rectangular grooves arranged at equal angular intervals in the circumferential direction) for engagement is formed.
[0018]
  The limiting nut 17 is a hexagonal nut having a diameter larger than that of the insertion hole 16a of the second tightening member 16 and smaller than that of the female screw hole 16b. The first lock nut 18 and the second lock nut 19 are also hexagonal nuts similar to the limiting nut 17.
[0019]
  When connecting the 1st precast member 11 and the 2nd precast member 12 using the above-mentioned connector, first, as shown in Drawing 5, joining of joint surface 11a of the 1st precast member 11 and 2nd precast member 12 Before contacting the surface 12a, the first lock nut 18 is screwed to the male screw portion 13a of the first rod 13 to the limit position, and the female screw hole 15a of the first tightening member 15 is engaged with the male screw portion 13a. To the limit position. Further, the second lock nut 19 is screwed to the male screw portion 14a of the second rod 14 to the limit position, and the insertion hole 16a of the second tightening member 16 is inserted into the male screw portion 14a. The limiting nut 17 is screwed onto the tip of the screw portion 14a. As can be seen from FIG. 5, when the limiting nut 17 is screwed into the male screw portion 14 a, the tip of the male screw portion 14 a slightly protrudes from the limiting nut 17. Since these operations are simple screwing operations, they can be performed without using a tool or the like.
[0020]
  Next, as shown in FIG. 6, the first precast member 11 is moved so that the notches 11b and 12b are aligned with each other by moving at least one of the first precast member 11 and the second precast member 12 using a crane or the like. 11 is brought into contact with the joining surface 12a of the second precast member 12 so that the first rod 13 and the second rod 14 face each other. Thereby, at least a part of the height direction of the limiting nut 17 attached to the tip of the male screw portion 14a of the second rod 14 is inserted into the first recess 15e of the first tightening member 15, and the male screw portion. A portion protruding from the limiting nut 17 of 14a is inserted into the second recess 15f. Even if the side corner portion of the limiting nut 17 is not necessarily aligned with the inner corner portion of the first recess 15e, the limiting nut 17 can be inserted into the first recess 15e. That is, the limit nut 17 rotates by a slight angle when the roundness of the end surface thereof contacts the opening edge of the first recess 15e, so that the limit nut 17 can be smoothly inserted into the first recess 15e.
[0021]
  Next, as shown in FIG. 7, a tool is engaged with each of the tooth ring-shaped portion 15 d of the first tightening member 15 and the tooth ring-shaped portion 16 d of the second tightening member 16 to fix the first tightening member 15. In this state, the second tightening member 16 is rotated in a predetermined direction (clockwise in the figure), and the female screw hole 16a of the second tightening member 16 is screwed into the male screw portion 15a of the first tightening member 15. To do. When the screwing progresses and the nut contact surface 16c of the second tightening member 16 contacts the limit nut 17, a tensile force is generated in the first rod 13 and the second rod 14, and the joint surface 11a of the first precast member 11 is generated. And the joint surface 12a of the second precast member 12 are in close contact with each other, and the two precast members 11 and 12 are connected. Incidentally, since the diameter of the insertion hole 16a of the second tightening member 16 is larger than the diameter of the male threaded portion 14a of the second rod 14, it can be inserted even when the axis of the second rod 13 and the second rod 14 is misaligned. By moving the second fastening member 16 using the gap between the hole 16a and the male screw portion 14a, the screwing operation can be performed without any trouble.
[0022]
  As described above, at the stage where the first tightening member 15 and the second tightening member 16 are screwed together, the limiting nut 17 has already been inserted into the first recess 15e of the first tightening member 15. Therefore, even if the second tightening member 16 is further tightened after the nut contact surface 16c of the second tightening member 16 contacts the limit nut 17, the limit nut 17 slightly rotates the clearance with the first recess 15e. It does not rotate any more, and the rotation is suppressed by mutual contact between the side corners and the inner surface of the first recess 15e.
[0023]
  Next, as shown in FIG. 8, the first lock nut 18 and the second lock nut 19 are rotated with the fingertips until they abut against the first tightening member 15 and the second tightening member 16, respectively. The first lock nut 18 is tightened to the first tightening member 15 and the second lock nut 19 is tightened to the second tightening member 16 using
[0024]
  Next, the notched portion 11b of the first precast member 11 and the notched portion 12b of the second precast member 12 are filled with a hardening material, for example, a reinforced mortar made of a mixture of mortar and resin, and cured.
[0025]
  Thus, according to the above-described coupler, the restriction nut 17 attached to the tip of the male screw portion 14a of the second rod 14 is restricted by being inserted into the first recess 15e of the first tightening member 15. Since the rotation of the nut 17 can be accurately suppressed, the nut contact surface 16c of the second tightening member 16 is restricted by the limiting nut 17 in the process of screwing the first tightening member 15 and the second tightening member 16 together. Even if the second tightening member 16 is further tightened after coming into contact, the limiting nut 17 only slightly rotates the clearance with the first recess 15e and does not rotate any further.
[0026]
  That is, the position of the limiting nut 17 in the second rod 14 is reliably prevented from shifting in the rod axis direction due to the rotation of the limiting nut 17, and an appropriate tensile force is applied to the first and second rods 13, 13. 14, thereby ensuring the desired connection strength for connecting the first precast member 11 and the second precast member 12.
[0027]
  Moreover, according to the above-mentioned precast member connection structure, the first precast member 11 and the second precast member 12 can be connected with high strength, and even when there are a plurality of connection locations, the connection strength varies. Therefore, it is possible to make concrete structures such as waterways and retaining walls robust, and to greatly contribute to shortening construction time and simplifying construction work.
[0028]
  In the above description, the first recess 15e has a cross-sectional shape having 12 corners at intervals of 30 degrees. However, as shown in FIG. 9A, 24 corners are 15 degrees. A cross-sectional shape having a spacing may be used as the first recess 15e1, and a cross-section similar to the limiting nut 17 having six corners spaced by 60 degrees as shown in FIG. 9B. A shape having a shape may be used as the first recess 15e2. If the number of corners is increased as in the first recess 15e1 shown in FIG. 9A, insertion of the limiting nut 17 into the first recess 15e1 can be performed more smoothly. If the value is increased too much, the cross-sectional shape of the first recess becomes nearly circular, and the desired anti-rotation effect cannot be obtained. In the case of the first recess 15e2 shown in FIG. 9B, an angle difference of 30 degrees at the maximum can be generated between the side corner of the limiting nut 17 and the inner corner of the first recess 15e2. Before the contact surface 11a of the first precast member 11 and the joint surface 12a of the second precast member 12 are brought into contact with each other, the positional relationship between the limiting nut 17 and the first recess 15e2 of the first tightening member 15 is visually confirmed. Then, any one of the limiting nut 17 and the first tightening member 15 is rotated to align both in advance.
[0029]
  In the above description, a hexagonal nut is used as the limiting nut 17, but a square nut as shown in FIG. 10B may be used as the limiting nut 17a. In this case as well, as shown in FIG. 10C, the cross-sectional shape of the first recess 15e3 is a square that is slightly larger than the limiting nut 17a, or two slightly larger than the limiting nut 17a. A shape in which quadrangles are overlapped with an angle difference of 45 degrees or a shape in which four quadrangles are overlapped with an angle difference of 22.5 degrees may be used.
[0030]
  Further, in the above description, the first tightening member 15 and the second tightening member 16 are each provided with the tooth ring-like portions 15d and 16d for tool engagement, but instead of the tooth ring-like portions 15d and 16d. Alternatively, a hexagonal portion or a quadrangular portion may be provided, and a tool may be engaged therewith.
[0031]
  [Second Embodiment]
  11 and 12 show a second embodiment of the present invention, in which the reference numeral 21 is a first precast member, 21a is a joining surface, 21b is a notch, 22 is a second precast member, and 22a is a joining surface. 22b is a notch, 23 is a first rod, 23a is a male threaded portion, 24 is a second rod, 24a is a male threaded portion, 25 is a first fastening member, 25a is a female screw hole, 25b is a male threaded portion, 25c is a flange, 25d is an annular portion, 26 is a second tightening member, 26a is an insertion hole, 26b is a female screw hole, 26c is a nut contact surface, 26d is an annular portion, 27 is a limit nut, and 28 is a first nut. 1 lock nut, 29 is the 2nd lock nut. In the second embodiment, a coupler for connecting the first precast member 21 and the second precast member 22 is constituted by the first tightening member 25, the second tightening member 26 and the limiting nut 27.
[0032]
  The second embodiment differs from the first embodiment described above in that the first fastening member 25 is provided with a recess 25e having the same cross-sectional shape as the first recess 15e of the first embodiment and having a large depth dimension. The point is that the second recess 15f as in the first embodiment is eliminated, and that the restriction nut 27 having a large height is used. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
[0033]
  When connecting the 1st precast member 21 and the 2nd precast member 22 using the above-mentioned coupler, first, before making the contact surface 21a of the 1st precast member 21 and the contact surface 22a of the 2nd precast member 22 contact. Next, the first lock nut 28 is screwed to the male screw portion 23a of the first rod 23 to near the limit position, and the female screw hole 25a of the first tightening member 25 is screwed to the male screw portion 23a to near the limit position. To do. The second lock nut 29 is screwed to the male screw portion 24a of the second rod 24 to the limit position, and the insertion hole 26a of the second tightening member 26 is inserted into the male screw portion 24a. A limiting nut 27 is screwed onto the tip of the screw portion 24a. As can be seen from FIG. 12, when the limiting nut 27 is screwed into the male threaded portion 24a, the tip of the male threaded portion 24a is prevented from protruding from the limiting nut 27. Since these operations are simple screwing operations, they can be performed without using a tool or the like.
[0034]
  Next, at least one of the first precast member 21 and the second precast member 22 is moved using a crane or the like, and the joint surface 21a of the first precast member 21 and the second precast member 21 are aligned so that the notches 21b and 22b are aligned with each other. 2 The joining surface 22a of the precast member 22 is brought into contact with the first rod 23 and the second rod 24 to face each other. As a result, at least a part in the height direction of the limiting nut 27 attached to the tip of the male screw portion 24 a of the second rod 24 is inserted into the recess 25 e of the first tightening member 25. Even if the side corner portion of the limiting nut 27 is not necessarily aligned with the inner corner portion of the concave portion 25e, the limiting nut 27 can be inserted into the concave portion 25e. That is, the limiting nut 27 rotates by a slight angle when the roundness of its end surface comes into contact with the opening edge of the concave portion 25e, so that the limiting nut 27 can be smoothly inserted into the concave portion 25e.
[0035]
  Next, the tool is engaged with each of the tooth ring-shaped portion 25d of the first tightening member 25 and the tooth ring-shaped portion 26d of the second tightening member 26, and the second tightening is performed with the first tightening member 25 fixed. The member 26 is rotated in a predetermined direction (clockwise in the drawing), and the female screw hole 26a of the second tightening member 26 is screwed into the male screw portion 25a of the first tightening member 25. When the screwing progresses and the nut contact surface 26c of the second tightening member 26 contacts the limit nut 27, a tensile force is generated in the first rod 23 and the second rod 24, and the joint surface 21a of the first precast member 21 is generated. And the joint surface 22a of the second precast member 22 are in close contact with each other, and the two precast members 21 and 22 are connected. Incidentally, since the diameter of the insertion hole 26a of the second tightening member 26 is larger than the diameter of the male screw portion 24a of the second rod 24, the insertion is possible even when the axis of the second rod 23 and the second rod 24 is misaligned. By moving the second tightening member 26 using the gap between the hole 26a and the male screw portion 24a, the screwing operation can be performed without any trouble.
[0036]
  As described above, at the stage of screwing the first tightening member 25 and the second tightening member 26, the limiting nut 27 has already been inserted into the recess 25e of the first tightening member 25. Even if the second tightening member 26 is further tightened after the nut abutting surface 26c of the second tightening member 26 is in contact with the limiting nut 27, the limiting nut 27 is only slightly rotated in the clearance with the recess 25e. The rotation does not occur as described above, and the rotation is suppressed by mutual contact between the side corners and the inner surface of the recess 25e.
[0037]
  Next, the first lock nut 28 and the second lock nut 29 are rotated with the fingertips until they come into contact with the first tightening member 25 and the second tightening member 26, respectively. 28 is fastened to the first fastening member 25, and the second lock nut 29 is fastened to the second fastening member 26.
[0038]
  Next, the notched portion 21b of the first precast member 21 and the notched portion 22b of the second precast member 22 are filled with a hardening material, for example, reinforced mortar made of a mixture of mortar and resin, and cured.
[0039]
  Thus, according to the above-described coupler, the limiting nut 27 is inserted into the recess 25e of the first tightening member 25 by inserting the limiting nut 27 attached to the tip of the male threaded portion 24a of the second rod 24. Therefore, in the process of screwing the first tightening member 25 and the second tightening member 26, the nut contact surface 26c of the second tightening member 26 contacts the limit nut 27. Even if the second tightening member 26 is further tightened after the contact, the limiting nut 27 only slightly rotates the clearance with the recess 25e and does not rotate any further.
[0040]
  That is, the position of the limiting nut 27 in the second rod 24 is reliably prevented from shifting in the rod axis direction due to the rotation of the limiting nut 27, and an appropriate tensile force is applied to the first, second rods 23, Thus, the desired connection strength for connecting the first precast member 21 and the second precast member 22 can be obtained with certainty.
[0041]
  Moreover, according to the above-mentioned precast member connection structure, the first precast member 21 and the second precast member 22 can be connected with high strength, and even when there are a plurality of connection locations, the connection strength varies. Therefore, it is possible to make concrete structures such as waterways and retaining walls robust, and to greatly contribute to shortening construction time and simplifying construction work.
[0042]
  In the above description, the recess 25e has a cross-sectional shape having twelve corners at intervals of 30 degrees. However, the recess has a cross-sectional shape like the first recess described in the first embodiment. May be adopted. Moreover, although the hexagonal nut was shown as a limiting nut, the square nut as described in the first embodiment may be used, and the cross-sectional shape of the recess may be arranged accordingly.
[0043]
  In the above description, the first tightening member 25 and the second tightening member 26 are each provided with the tooth ring-like portions 25d and 26d for engaging the tool, but instead of the tooth ring-like portions 25d and 26d. Alternatively, a hexagonal portion or a quadrangular portion may be provided, and a tool may be engaged therewith.
[0044]
  1st to 1st above2In the embodiment, the present invention is applied to the connection of precast concrete members used when constructing a concrete structure such as a water channel or a retaining wall. However, the present invention can be applied when building a building such as a prefab house or a building. It can be widely applied when connecting precast members in the construction use.
[0045]
【The invention's effect】
  As described above in detail, according to the present invention, the position of the limiting nut in the second rod is caused by the rotation of the limiting nut in the process of screwing the first tightening member and the second tightening member. It is possible to reliably prevent displacement in the direction, and to generate an appropriate tensile force on the first and second rods, thereby ensuring the desired connection strength between the first precast member and the second precast member. Can get into.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a coupler and a precast member according to a first embodiment of the present invention.
2 is a top view and a bottom view of the first fastening member shown in FIG. 1. FIG.
3 is a view showing a state in which a limiting nut has entered a first recess of the first fastening member shown in FIG. 1;
4 is a bottom view and a top view of the second fastening member shown in FIG. 1. FIG.
FIG. 5 is an explanatory diagram of a connecting operation according to the first embodiment.
FIG. 6 is an explanatory diagram of a connecting operation according to the first embodiment.
FIG. 7 is an explanatory diagram of a connecting operation according to the first embodiment.
FIG. 8 is an explanatory diagram of a connecting operation according to the first embodiment.
FIG. 9 is a view showing a modification of the first recess of the first fastening member shown in FIG.
10 is a view showing a modified example of the first recess and the nut of the first fastening member shown in FIG. 1, and a view showing a state where the nut has entered the first recess.
FIG. 11 is a longitudinal sectional view of a coupler and a precast member according to a second embodiment of the present invention.
FIG. 12 is a view showing a state after connection according to the second embodiment.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 11 ... 1st precast member, 12 ... 2nd precast member, 13 ... 1st rod, 13a ... Male screw part, 14 ... 2nd rod, 14a ... Male screw part, 15 ... 1st clamping member, 15a ... Female screw Hole, 15b ... male screw portion, 15e, 15e1, 15e2, 15e3 ... concave portion, 16 ... second tightening member, 16a ... insertion hole, 16b ... female screw hole, 16c ... nut contact surface, 17, 17a ... limiting nut 21 ... 1st precast member, 22 ... 2nd precast member, 23 ... 1st rod, 23a ... Male screw part, 24 ... 2nd rod, 24a ... Male screw part, 25 ... 1st clamping member, 25a ... Female Screw hole, 25b ... male screw portion, 25e ... concave portion, 26 ... second tightening member, 26a ... insertion hole, 26b ... female screw hole, 26c ... nut contact surface, 27 ... limiting nut.

Claims

A first precast member in which the first rod is embedded so that the male screw portion at the tip thereof is exposed, and a second precast member in which the second rod is embedded so that the male screw portion at the tip is exposed are mutually connected. It is a connector used when connecting with the rods facing each other,
It has a female screw hole that can be screwed into the male screw part of the first rod and a male screw part for fastening, and is arranged on the first rod in a state where the male screw part of the first rod is screwed into the female screw hole. A first clamping member that can be
An insertion hole through which the second rod can be inserted with a margin and a female screw hole that can be screwed into the male screw portion of the first tightening member are continuously provided via the nut abutment surface. A second fastening member that can be disposed on the second rod with the tip of the rod inserted;
A limiting nut that can be screwed into the male thread portion of the second rod to limit the movement of the second tightening member in the direction toward the tip of the second rod by contact with the nut contact surface;
On the side facing the limiting nut of the first tightening member, at least a part of the limiting nut in the height direction is threaded when the female screw hole of the second tightening member is screwed into the male screw portion of the first tightening member. An anti-rotation portion is formed which is composed of a recess that can be inserted, and suppresses the rotation of the limit nut by mutual contact between the side corner portion of the limit nut and the inner surface of the recess in the inserted state.
A coupler characterized by that.