JP4045563B2

JP4045563B2 - Joint of continuous sheet pile wall

Info

Publication number: JP4045563B2
Application number: JP23257599A
Authority: JP
Inventors: 俊介杉本; 郁郎甚内; 和之田崎
Original assignee: Kajima Corp; Nippon Steel Corp; Toyo Construction Co Ltd
Current assignee: Kajima Corp; Nippon Steel Corp; Toray Engineering Co Ltd
Priority date: 1999-08-19
Filing date: 1999-08-19
Publication date: 2008-02-13
Anticipated expiration: 2019-08-19
Also published as: JP2001055732A

Description

【０００１】
【発明の属する技術分野】
本発明は、矢板の相互間を連結して連続矢板壁とする継手、特に剛結嵌合構造の継手に関する。
【０００２】
【従来の技術】
従来、剛結嵌合構造の継手としては、例えば、特公平４−３０４９５号公報に記載されたものがあった。このものは、鉄筋籠を建込んだ溝孔内にコンクリートを打設してなる連続壁に用いられるもので、図１４に示すように、先行壁体１内の鉄筋籠を構成する横鉄筋２に接続された、スリット３を有する断面Ｃ字形の受け金具（めす継手部材）４と、先端に係止金具５を有し、後行壁体用鉄筋籠を構成する鉄筋６から延設されて、前記スリット３を縦方向に通して前記係止金具５を受け金具４に嵌合させる継手板（おす継手部材）７とを備えており、めす継手部材４内に充填したモルタルなどの固結材により受け金具４と継手板７とが剛結されるようになっている。
【０００３】
ところで、上記受け金具４内への固結材の充填は、通常、後行壁体用鉄筋籠を建込んだ溝孔内にコンクリートを打設した後に行われるようになっており、受け金具４と継手板７とを単に連結させた状態で、コンクリートを打設すると、スリット３内の間隙ａを通して受け金具４内にコンクリートが侵入してしまい、本来受け金具４内に注入すべき固結材の強度が著しく低下することになる（同公報第３欄第１８〜２２行参照）。そこで、同公報に記載の発明では、同じく図１４に示すように、継手板７の両板面に挟持板８，８を用いて弾性変形可能な遮板９、９を固定し、これら遮板９の自由端部を受け金具４の外周面に圧着させて、前記間隙ａを遮蔽する対策を採っていた。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記遮板９を設けた剛結嵌合構造の継手によれば、上記のごとく鉄筋籠を建込んだ溝孔内にコンクリートを打設する連続壁に適用する場合は問題がないものの、例えば、土止め用、止水用などの連続矢板壁のように壁体の片側または両側が空域または水域に曝される場合は、遮板９の押えが全く効かないか、効いてもわずかであるため、受け金具４内に充填した固結材の圧力を受けて遮板９が開いてしまい、固結材が受け金具４から漏出してしまう。
【０００５】
本発明は、上記従来の技術的背景に鑑みてなされたもので、その目的とするところは、めす継手部材内からの固結材の漏出を確実に防止し、もって土止め用、止水用などの連続矢板壁への適用性を高めた剛結嵌合構造の継手を提供することにある。
【０００６】
【課題を解決するための手段】
上記目的を達成するため、本発明は、相隣接して打設される一方の矢板に突設された、縦方向のスリットを有する筒状のめす継手部材と、前記めす継手部材に挿入可能な係止部を先端に有し、前記めす継手部材に挿入可能な係止部を先端に有し、他方の矢板の側端から延設されて、前記スリットを縦方向に通して前記係止部を前記めす継手部材に嵌合させる板状のおす継手部材とを備え、かつ前記めす継手部材内に充填した固結材により前記両継手部材が剛結される連続矢板壁の継手において、前記めす継手部材の外面の、前記スリットに隣接する片側または両側部分に弾性変形可能な鋼板製遮蔽板の基端部を固定し、該遮蔽板の、前記基端部に対して折曲させた折曲部の自由端部を前記スリットの内側開口方向に延在させて、前記おす継手部材の板面に衝合させる構成としたことを特徴とする。
【０００７】
このように構成した連続矢板壁の継手においては、遮蔽板の自由端部がスリットの内側開口方向に延在しておす継手部材の板面に衝合しているので、めす継手部材内に固結材を充填すると、該固結材の圧力により遮蔽板がスリットの外側開口方向へ膨出変形しようとして、その自由端部をおす継手部材の板面に強く圧着させ、めす継手部材内からの固結材の漏出を防止する。
【０００８】
本発明において、上記めす継手部材に設けるスリットは、平行端面を有する形状としてもよいが、少なくとも遮蔽板を固定した側の端面に、スリットの外側開口方向に向けて次第に開先を拡大するテーパを付けた形状としてもよい。スリットの端面にテーパを付けた場合は、スリットを縦方向に通しておす継手部材をめす継手部材に連結する際、該おす継手部材がスリットの内縁に優先的に接触して、その必要以上の移動が阻止され、おす継手部材の押圧力による遮蔽板の座屈、損傷などが未然に防止される。
【０００９】
本発明において、上記遮蔽板は、長尺な一体物としてもよいが、縦方向に複数分割した分割構成としてもよい。分割構成とする場合は、各分割要素が、上位のものの裏面に下位のものが重なるように相互に端部同士をラップさせて配置するのが望ましく、これにより、スリットにおす継手部材を差し込む際、分割要素の上端縁がおす継手部材に干渉することはなくなる。
【００１０】
本発明は、上記矢板の種類を特に問うものではないが、ボックス型矢板を用いることができる。この場合、めす継手部材およびおす継手部材を該ボックス型矢板の両側に各一対設けるのが望ましく、これにより継手間の空域をコンクリートの打設域として利用することができ、強度を有する厚肉の止水壁を構築する場合に好適となる。
【００１１】
【発明の実施の形態】
以下、本発明の実施の形態を添付図面に基づいて説明する。
【００１２】
図５は、本発明に係る継手を用いて打設した連続矢板壁を含む止水壁の全体構造を示したものである。この止水壁１は、ダム堤体２に取水口３を開通工事する際の仮締切りに用いられるもので、ダム堤体２に対してアーチ形（半円形）に構築されて、開通すべき取水口３の前方水域Ｗを締切っている。この止水壁１は、水底地盤上に固定した架台４に設けた導枠５に沿って打設された二重矢板壁（連続矢板壁）６とこの二重矢板壁６内に打設されたコンクリート層７とからなっている。止水壁１の両端部（戸当り部）は、図６に示すように、ダム堤体２に形成した縦溝８内に二重矢板壁６の一部をシール部材９を介して嵌入させることにより水密に結合されており、これにより止水壁１の内側は、その外側の水域Ｗに対して完全に締切りされ、したがって、この内側を排水することで開通すべき取水口３の前方に工事用空間Ｓが出現することになる。
【００１３】
上記二重矢板壁６は、図４によく示されるように、ここではボックス型矢板１０，１０…を本発明に係る剛結嵌合構造の継手１１を介して連結してなっている。各ボックス型矢板１０は、矩形断面の枠体１２の内部を複数の仕切板１３により打設方向に複数の室Ａ，Ａに分割した構造となっており、各室Ａ内に前記コンクリート層７が打設されている。ここで、前記仕切板１３のうちの中央に位置するものは、相互間を切り離して重ねた二枚の板体１３ａ，１３ｂからなっており、ボックス型矢板１０内のコンクリート層７は、この二枚重ねの板体１３ａと１３ｂとの間で縁切りされている。また、二枚重ねの板体１３ａ，１３ｂを除く他の仕切板１３には室Ａの相互間を連通する複数の連通孔（図示略）が設けられており、したがって、ボックス型矢板１０内のコンクリート層７は、この二枚重ねの板体１３ａ、１３ｂの両側では一体構造となっている。
【００１４】
上記ボックス型矢板１０を連結するための本発明に係る継手１１は、図１乃至図３にも示すように、縦方向のスリット１５を有する筒状のめす継手部材１６と、このめす継手部材１６に挿入可能な筒状の係止部１７を先端に有する板状のおす継手部材１８とを備えている。これらめす継手部材１６とおす継手部材１８とは、各ボックス型矢板１０の両側にその枠体１２の面板１２ａの延長片を利用して各一対設けられている。継手１１は、相隣接して打設された二つのボックス型矢板１０，１０の間において、各おす継手部材１８をめす継手部材１６のスリット１５に縦方向に通すと共に、おす継手部材１８の係止部１７をめす継手部材１６に嵌合させる連結構造となっている。しかして、このめす継手部材１６内には、モルタルなどの固結材を充填してなる固結材層１９が打設されており、この固結材層１９内に前記おす継手部材１８の係止部１７が埋め込まれている。すなわち、本発明に係る継手１１は、めす継手部材１６とおす継手部材１８とを嵌合させかつ両者の間を固結材層１９で固結してなる剛結嵌合構造となっている。
【００１５】
上記継手１１の使用により、相隣接して打設された二つのボックス型矢板１０，１０の間には、各独立の室Ｂが区画形成され（図４）、この室Ｂ内にも前記コンクリート層７が打設されている。各ボックス型矢板１０の側板１２ｂには上記室Ｂ内と前記枠体１１内の室Ａとを連通する複数の連通孔（図示略）が設けられており、したがって、コンクリート層７は、相隣接して打設された一方のボックス型矢板１０内の一方の板体１３ａと他方のボックス型矢板１０内の他方の板体１３ｂとの間で一体構造となっている。
【００１６】
本発明に係る継手１１には、図１によく示されるように、相隣接して打設された二つのボックス型矢板１０，１０の相互間に形成された室Ｂ内とめす継手部材１６内との連通を遮断する第１の遮蔽板２０と、めす継手部材１６内とボックス型矢板１０の外側との連通を遮断する第２の遮蔽板２１とが添設されている。第１の遮蔽板２０は、弾性変形可能な部材、例えばばね鋼板からなっており、その基端部がおす継手部材１８の内側板面に押え板２２とボルト２３とを用いて固定されている。この第１の遮蔽板２０は、室Ｂ側へわずかに湾曲する湾曲癖を有しており、その自由端部をめす継手部材１６の外面の、スリット１５に隣接する内側部分に衝合させている。すなわち、おす継手部材１８の片側（内側）に形成されるスリット１５内の間隙は室Ｂ側から閉鎖された状態となり、したがって、室Ｂ内にコンクリートを注入しても該コンクリートがめす継手部材１６内に流入することはなくなる。
【００１７】
一方、第２の遮蔽板２１も、弾性変形可能な部材、例えばばね鋼板からなっており、その基端部２１ａがめす継手部材１６の、スリット１５に隣接する外側部分に押え板２４とボルト２５とを用いて固定されている。この第２の遮蔽板２１は、図２および図３によく示されるように、その基端部２１ａに対して所定の角度で折曲させた折曲部２１ｂを有しており、この折曲部２１ｂの先端部（自由端部）をスリット１５の内側開口方向に延在させて、前記おす継手部材１８の外側板面に衝合させている。すなわち、おす継手部材１８の他側（外側）に形成されるスリット１５内の間隙はめす継手部材１６の内側から閉鎖された状態となり、したがってめす継手部材１６内に固結材を注入しても該固結材が二重矢板壁６の外側の水域に漏出することはなくなる。ところで、この第２の遮蔽板２１の折曲部２１ｂは、めす継手部材１６内に注入した固結材の圧力によりスリット１５の外側開口方向へわずか膨出変形するが、該第２の遮蔽板２１として適当な板厚（強度）を有するものを選択することで、該第２の遮蔽板２１の座屈や破損が未然に防止され、スリット１５内の間隙は確実に内側から閉鎖されるようになる。
【００１８】
上記止水壁１の構築に際しては、予め上記おす継手部材１８の内側板面に第１の遮蔽板２０を、上記めす継手部材１６の外面に第２の遮蔽板２１をそれぞれ取付けておく。そして、前出図５に示したように、水底地盤上に固定した架台４に設けた導枠５に沿って上記したボックス型矢板１０を本継手１１を介して連結しながら順次打設する。このボックス型矢板１０の打設に際しては、先行して打設したボックス型矢板１０の側端に設けためす継手部材１６のスリット１５に、後行のボックス型矢板１０の側端に設けたおす継手部材１８を縦方向に通し（差し込み）ながら、該おす継手部材１８の係止部１７をめす継手部材１６に嵌合させて両継手部材１６と１８とを連結する。この連結の開始に当っては、第１の遮蔽板２０の自由端部を適当に拡張させ、かつ第２の遮蔽板２１の自由端部を適当に圧縮させて、めす継手部材１６のスリット１５内へおす継手部材１８を差し込むようにするが、一旦差し込んだ後は、おす継手部材１８の下動に応じて第１および第２の遮蔽板２０、２１が順次拡張、圧縮して、それぞれの自由端部がめす継手部材１６の外面、おす継手部材１８の外側板面に弾発力で圧着する。
【００１９】
このようにして、導枠５に沿ってボックス型矢板１０を本継手１１を介して連結しながら順次打設して、二重矢板壁６をダム堤体２に対してアーチ形に構築し（図５）、この二重矢板壁６の構築完了後、各ボックス型矢板１０内の室Ａおよび相隣接して打設したボックス型矢板１０の相互間の室Ｂにコンクリートを注入し、コンクリート層７を打設する。この時、前記ボックス型矢板１０の相互間の室Ｂ内のコンクリートは、めす継手部材１６のスリット１５内の間隙を通してめす継手部材１６内に侵入しようとするが、前記したように第１の遮蔽板２０がその間隙を室Ｂ側から閉鎖しているので、室Ｂ内へのコンクリートの侵入が阻止される。
【００２０】
その後、上記二重矢板壁６内に注入したコンクリートの養生硬化を待って、めす継手部材１６内に固結材を注入し固結材層１９を打設する。この時、めす継手部材１６内の固結材は、スリット１５の間隙を通して二重矢板壁６を外側の水域へ漏出しようとするが、この固結材の圧力を受けて第２の遮蔽板２１の折曲部２１ｂがスリット１５の外側開口方向へ膨出変形して、その自由端部がおす継手部材１８の外側板面に強く圧着され、これによりめす継手部材１６内からの固結材の漏出が防止される。そして、めす継手部材１６内の固結材はそのまま硬化してめす継手部材１６内におす継手部材１８の係止部１７を剛結し、これにて止水壁１の構築は完了する。
【００２１】
なお、このように構築された止水壁１は、前記したようにそのコンクリート層７がボックス型矢板１０内の一対の板体１３ａと１３ｂとの間で縁切りされているので、ダム堤体２への取水口３の開通工事完了後、二枚の板体１３ａと１３ｂとの間で枠体１２の面板１２ａを縦方向（紙面に垂直方向）に切断すれば、止水壁１は、相隣接して打設された一方のボックス型矢板１０内の一方の板体１３ａと他方のボックス型矢板１０内の他方の板体１３ｂとの間で複数分割された状態となり、この分割単位で簡単に解体することができる。
【００２２】
ここで、上記めす継手部材１６は、図７に示すように、そのスリット１５の、第２の遮蔽板２１を固定した側の端面に、スリット１５の外側開口方向に向けて次第に開先を拡大するテーパ２６を付ける形状としてもよい。このようにテーパ２６を付けることで、スリット１５を縦方向に通しておす継手部材１８をめす継手部材１６に連結する際、同図に示すように、該おす継手部材１８がスリット１５の端面の内縁に優先的に接触するので、第２の遮蔽板２１が必要以上に圧縮変形することがなく、該遮蔽板２１の座屈または損傷が未然に防止される。
【００２３】
また、上記おす継手部材１８に取付ける第１の遮蔽板２０およびめす継手部材１６に取付ける第２の遮蔽板２１は、縦方向に複数分割してもよいものである。図８は、このように遮蔽板を分割構成とする場合の実施形態を、第２の遮蔽板２１を例に採って示したもので、この場合は、各分割要素２７ａ，２７ｂ…を、それぞれの上位のものの裏面側に下位のものが重なるように相互に端部同士をラップさせて配置し、これらを共通の押え部材２４（分割構成でもよい）とボルト２５とを用いてめす継手部材１６の外面に固定するようにする。このように分割要素２７ａ，２７ｂ…を配置することにより、めす継手部材１６のスリット１５（図１）におす継手部材１８を縦方向に差込んでも、各分割要素２７ａ，２７ｂの上端縁がおす継手部材１８に引掛かることはなく、ボックス型矢板１０の連結を円滑に行うことができる。しかも、このように分割構成とする場合は、第１の遮蔽板２０および第２の遮蔽板２１として、長尺の一体物を用意する必要がなく、それらの製造が簡単になる。
【００２４】
さらに、上記止水壁１の構築に際しては、前記したようにダム堤体２に形成した縦溝８内に二重矢板壁６の一部をシール部材９を介して嵌入させることにより戸当り部を形成するようにしているが（図６）、この戸当り部の形成に際しては、図９に示すように、本継手１１を構成するめす継手部材１６を掘削機３０の昇降レールとして利用することができる。この場合、掘削機３０を支持するベース３１の背面に、本継手１１のおす継手部材１８に相当する一対の係止部材３２を突設し、該ベース３１を適宜の作業機械に吊って、その係止部材３２を各めす継手部材１６のスリット１５に差し込みながら、係止部材３２の先端の係止部３３をめす継手部材１６に嵌合させるようし、掘削機３０を次第に下動させながら該掘削機３０のカッタ（図示略）で縦溝８を掘削する。そして、この縦溝８の掘削後は、前記継手１１を利用して適宜幅のボックス型矢板を先行のボックス型矢板１０に連結して、その一部を縦溝８内に嵌合させ、さらにその内部にコンクリートを打設して、戸当り部を完成させる。
【００２５】
ここで、上記縦溝８の掘削後は、掘削機３０を上動させて係止部材３２をめす継手部材１６から抜取らなければならないが、この時、前記分割要素２７ａ，２７ｂ…（図８）からなる遮蔽板（第１の遮蔽板）２１をそのまま用いたのでは、掘削機３０の上動に際して、その係止部材３２の上端縁が分割要素２７ａ，２７ｂ…の下端縁に干渉して、その抜取りが困難になる。この場合は、図１０に示すように、各分割要素２７ａ，２７ｂ…の下端縁にスリット１５の内側開口に向けて上方傾斜するテーパ３３を付けるの望ましく、これにより、下動および上動の双方で、係止部材３２が各分割要素２７ａ，２７ｂ…に干渉することはなくなる。
【００２６】
上記実施の形態においては、二重矢板壁６を構成するボックス型矢板１０の連結に用いる継手１１を示したが、本発明に係る継手は、他の種類の矢板、例えば鋼管矢板、コンクリート矢板などの連結にも用いてもよいことはもちろんである。図１１は、鋼管矢板４０，４０の連結に用いた継手４１を示したもので、ここでは、縦方向のスリット４２を有するめす継手部材４３が一方の鋼管矢板４０の周面に、先端に係止部４４を有するおす継手部材４５が他方の鋼管矢板４０の周面に固設されている。本継手４１においても、めす継手部材４３の外面の、スリット４２に隣接する部分に、上記実施の形態におけると同様の遮蔽板４６を取付けることにより、めす継手部材４３内に注入した固結材の外部への漏出を防止することができる。
【００２７】
なお、遮蔽板（第２の遮蔽板）２１、４６は、構築する連続矢板壁の使用目的により、または該連続矢板壁の周りの環境（水、空気）により、めす継手部材４３の外面の、スリット４２に隣接する片側部分または両側部分に取付けるもので、当然のこととして止水壁以外への適用も可能である。
【００２８】
【実施例】
図１２に示すような疑似継手５０を用いて実験室的な漏れ試験を行った。疑似継手５０は、断面寸法100 ×100 ×12(mm)でかつ長さが２ｍのコ字形アングル材５１を用意し、このアングル材５１を、その両側に固着したフランジ板５２，５２を利用して種々の間隔Ｓと所定の深さＤとを有するスリット５３を設けた支持板５４にボルト・ナット５５により結合し、さらに、支持板５４のスリット５３に隣接する片側部分に種々の板厚ｔを有するばね鋼板製（JIS SUP ）の遮蔽板５６の基端部を固定し、この遮蔽板５６の自由端部をスリット５３の内側開口方向へ延在させて、スリット５３の他側の端面に衝合させる構造となっている。
試験に際しては、アングル材５１の下端および上端開口を蓋体（図示略）で閉鎖して、この内部にバルブ５７付きの配管５８を通じて疑似セメントミルク（ベントナイト）を段階的に圧力を変えて圧送し、スリット５３からの漏れを観察した。
試験条件は、スリット５３はその間隔Ｓを5mm と10mmの２通りに設定すると共にその深さＤを25mmの一定とし、遮蔽板５６として、板厚ｔが0.2mm 、0.3mm 、0.5mm 、0.6mm のものを選択し、疑似セメントミルクの注入圧力は 98kPa（１kgf/cm² ）〜588kPa（６kgf/cm² ）の間で段階的に変化させた。なお、この注入圧力５〜６kgf/cm² は、モルタルに換算して10ｍ程度の注入高さに相当する。結果を、図１３に一括して示す。
【００２９】
図１３に示す結果より、板厚ｔが0.2mm の遮蔽板５６は、スリット５３の間隔Ｓが5mm と狭くても、約２kgf/cm² の圧力で破断し、その使用に問題のあることが分かった。また、板厚ｔが0.3mm の遮蔽板５６は、スリット５３の間隔Ｓが5mm と狭い場合には６kgf/cm² の注入圧力でも漏れは発生しなかったが、スリット５３の間隔Ｓが10mmと広くなると、５kgf/cm² で漏れが発生し、スリット５３の間隔Ｓを適当に設定する必要があることが分かった。一方、板厚ｔが0.5mm 以上の遮蔽板５６は、スリット５３の間隔Ｓが5mm であると10mmであるとを問わず、何れも６kgf/cm² の注入圧力まで漏れは発生せず、実用的に全く問題のないことが分かった。
【００３０】
【発明の効果】
以上、詳細に説明したように、本発明に係る連続矢板壁の継手によれば、継手周囲が空域または水域であっても、めす継手部材内からの固結材の漏出を確実に防止することができ、土止め用、止水用などの連続矢板壁の連結に向けて好適となる。
【図面の簡単な説明】
【図１】本発明に係る継手を用いて構築した止水壁の継手部分の構造を示す平面図である。
【図２】本発明に係る継手の平面図である。
【図３】本発明に係る継手の一部を示す斜視図である。
【図４】本継手を用いて構築した止水壁の要部構造を示す平面図である。
【図５】本継手を用いて構築した止水壁の全体構造を示す平面図である。
【図６】本継手を用いて構築した止水壁の戸当り部の構造を示す平面図である。
【図７】本発明に係る継手の変形構造を示す平面図である。
【図８】本発明に係る継手の、他の変形構造を示す斜視図である。
【図９】本継手を止水壁の戸当り部の掘削に利用した場合の利用態様を示す平面図である。
【図１０】止水壁の戸当り部の掘削に利用する場合の、本継手の好ましい実施の形態を示す斜視図である。
【図１１】鋼管杭の連結に用いた本発明に係る継手の構造を示す平面図である。
【図１２】試験に用いた疑似継手の構造を示す平面図である。
【図１３】疑似継手を用いて行った漏れ試験結果を示す図表である。
【図１４】従来の剛結嵌合構造の継手を示す平面図である。
【符号の説明】
１止水壁
６二重矢板壁（連続矢板壁）
７コンクリート層
１０ボックス型矢板
１１，４１継手
１５，４２スリット
１６，４３めす継手部材
１７，４４係止部
１８，４５おす継手部材
１９固結材層
２１遮蔽板
２４押え板
２５ボルト
２７ａ，２７ｂ，２７ｃ遮蔽板の分割要素[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint that connects sheet piles to form a continuous sheet pile wall, and particularly relates to a joint having a rigid fitting structure.
[0002]
[Prior art]
Conventionally, as a joint having a rigid fitting structure, for example, there is one described in Japanese Patent Publication No. 4-30495. This is used for a continuous wall in which concrete is cast in a slot in which a reinforcing bar is built. As shown in FIG. 14, the horizontal reinforcing bar 2 constituting the reinforcing bar in the preceding wall body 1 is used. A receiving metal fitting (female joint member) 4 having a slit 3 and having a slit 3 and a locking metal fitting 5 at the tip thereof, and extending from a reinforcing bar 6 constituting a reinforcing bar rod for a trailing wall body. And a joint plate (male joint member) 7 that passes through the slit 3 in the longitudinal direction and fits the latch metal 5 into the metal fitting 4, and is configured to fix mortar filled in the female joint member 4. The receiving metal 4 and the joint plate 7 are rigidly connected by the material.
[0003]
By the way, filling of the caking material into the receiving metal fitting 4 is normally performed after placing concrete in a slot in which a reinforcing bar for a trailing wall body is built. If the concrete is cast with the joint plate 7 simply connected, the concrete enters the receiving metal 4 through the gap a in the slit 3, and the consolidated material to be injected into the original receiving metal 4. Will be significantly reduced (see the third column, lines 18-22 of the same publication). Therefore, in the invention described in the publication, as also shown in FIG. 14, the elastically deformable shielding plate 9, 9 fixed with clamping plates 8, 8 on both plate surfaces of the joint plate 7, these shield plate 9 is used to shield the gap a by crimping the free end portion 9 to the outer peripheral surface of the metal fitting 4.
[0004]
[Problems to be solved by the invention]
However, according to the joint of the rigid fitting structure provided with the shielding plate 9, there is no problem when applied to a continuous wall in which concrete is placed in a groove hole in which a reinforcing bar is built as described above. For example, when one or both sides of the wall body is exposed to air or water areas, such as a continuous sheet pile wall for earth retaining or water stopping, the presser of the shielding plate 9 is not effective at all or only slightly effective. For this reason, the shielding plate 9 opens due to the pressure of the consolidated material filled in the receiving metal fitting 4, and the consolidated material leaks from the receiving metal fitting 4.
[0005]
The present invention has been made in view of the above-described conventional technical background, and the object of the present invention is to reliably prevent leakage of the consolidated material from within the female joint member, thereby preventing soil and water. An object of the present invention is to provide a joint having a rigid fitting structure with improved applicability to a continuous sheet pile wall.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a cylindrical female joint member having a longitudinal slit projecting from one sheet pile placed adjacent to each other, and insertable into the female joint member. A locking portion at the tip, a locking portion that can be inserted into the female joint member at the tip, extending from the side end of the other sheet pile, and passing through the slit in the vertical direction to the locking portion A joint of a continuous sheet pile wall in which the two joint members are rigidly connected by a solidified material filled in the female joint member. A bent end of the joint member is fixed to the base end of a steel plate shielding plate that can be elastically deformed on one or both sides adjacent to the slit, and is bent with respect to the base end of the shielding plate. the free ends of the parts is extended in the inner opening direction of the slit, said male fitting Characterized by being configured to abut on the plate surface of the wood.
[0007]
In the joint of the continuous sheet pile wall configured in this way, the free end of the shielding plate abuts the plate surface of the joint member extending in the direction of the inner opening of the slit. When the binder is filled, the shield plate is swelled and deformed toward the outer opening of the slit due to the pressure of the binder, and the free end portion is strongly pressed against the plate surface of the joint member. Prevent leakage of consolidated material.
[0008]
In the present invention, the slit provided in the female joint member may have a shape having a parallel end face, but at least the end face on the side where the shielding plate is fixed has a taper that gradually expands the groove toward the outer opening direction of the slit. It is good also as the attached shape. When the end face of the slit is tapered, when the male joint member is preferentially in contact with the inner edge of the slit when the joint member is connected to the joint member passing through the slit in the longitudinal direction, it is more than necessary. The movement is prevented, and the shield plate is prevented from buckling and damage due to the pressing force of the male joint member.
[0009]
In the present invention, the shielding plate may be a single long object, or may be divided into a plurality of parts in the vertical direction. In the case of a split configuration, it is desirable that each split element is placed with its ends overlapped with each other so that the lower one overlaps the back surface of the upper one. The upper edge of the dividing element does not interfere with the male joint member.
[0010]
The present invention does not specifically ask the type of the sheet pile, but a box-type sheet pile can be used. In this case, it is desirable to provide a pair of female joint members and male joint members on both sides of the box-type sheet pile, so that the air space between the joints can be used as a concrete placement area, and a thick wall having strength. This is suitable for constructing a water blocking wall.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0012]
FIG. 5 shows the overall structure of the water blocking wall including a continuous sheet pile wall that is driven using the joint according to the present invention. This water blocking wall 1 is used for temporary closing when the intake 3 is opened in the dam dam body 2 and is constructed in an arch shape (semi-circular) with respect to the dam dam body 2 and should be opened. The front water area W of the water intake 3 is cut off. This water blocking wall 1 is driven in a double sheet pile wall (continuous sheet pile wall) 6 that is driven along a guide frame 5 provided on a gantry 4 fixed on the water bottom ground, and in this double sheet pile wall 6. It consists of a concrete layer 7. As shown in FIG. 6, both end portions (door-to-door portions) of the water blocking wall 1 are fitted with a part of the double sheet pile wall 6 through a seal member 9 in a longitudinal groove 8 formed in the dam dam body 2. Thus, the inner side of the water blocking wall 1 is completely cut off with respect to the water area W on the outer side. Therefore, the drainage of the inner side leads to the front side of the intake port 3 to be opened. The construction space S will appear.
[0013]
As shown in FIG. 4, the double sheet pile wall 6 is formed by connecting box-type sheet piles 10, 10... Via a joint 11 having a rigid fitting structure according to the present invention. Each box-type sheet pile 10 has a structure in which the inside of a rectangular cross-section frame 12 is divided into a plurality of chambers A, A in a placement direction by a plurality of partition plates 13, and the concrete layer 7 is placed in each chamber A. Has been laid. Here, the one located in the center of the partition plate 13 is composed of two plate bodies 13a and 13b which are separated from each other and overlapped, and the concrete layer 7 in the box-type sheet pile 10 is overlapped with the two sheets. The plate bodies 13a and 13b are bordered. Further, the other partition plates 13 except for the two stacked plates 13a and 13b are provided with a plurality of communication holes (not shown) communicating with each other in the chamber A, and therefore, the concrete layer in the box-type sheet pile 10 is provided. 7 has an integral structure on both sides of the double-layered plates 13a and 13b.
[0014]
The joint 11 according to the present invention for connecting the box-type sheet pile 10 includes a cylindrical female joint member 16 having a longitudinal slit 15 and the female joint member 16 as shown in FIGS. And a plate-shaped male joint member 18 having a cylindrical locking portion 17 that can be inserted into the front end. A pair of the female joint member 16 and the male joint member 18 are provided on both sides of each box-type sheet pile 10 by using an extension piece of the face plate 12a of the frame body 12. The joint 11 is passed between the two box-type sheet piles 10 and 10 placed adjacent to each other in the vertical direction through the slits 15 of the joint members 16 for the male joint members 18, and the male joint member 18 is engaged with the joint 11. The coupling structure 16 is fitted to the joint member 16 for fitting the stopper 17. The female joint member 16 is provided with a consolidated material layer 19 filled with a consolidated material such as mortar, and the male joint member 18 is engaged in the consolidated material layer 19. A stop 17 is embedded. That is, the joint 11 according to the present invention has a rigid fitting structure in which the female joint member 16 and the male joint member 18 are fitted and the two are solidified by the solidified material layer 19.
[0015]
By using the joint 11, an independent chamber B is defined between two box-type sheet piles 10 and 10 placed adjacent to each other (FIG. 4). Layer 7 is cast. A side plate 12b of each box-type sheet pile 10 is provided with a plurality of communication holes (not shown) for communicating the inside of the chamber B and the chamber A in the frame body 11, so that the concrete layer 7 is adjacent to each other. Thus, an integrated structure is formed between one plate body 13 a in one box-type sheet pile 10 and the other plate body 13 b in the other box-type sheet pile 10.
[0016]
In the joint 11 according to the present invention, as well shown in FIG. 1, the inside of the female joint member 16 and the inside of the chamber B formed between the two box-type sheet piles 10 and 10 placed adjacent to each other. A first shielding plate 20 that blocks communication with the second coupling plate 16 and a second shielding plate 21 that blocks communication between the female joint member 16 and the outside of the box-type sheet pile 10 are attached. The first shielding plate 20 is made of an elastically deformable member, for example, a spring steel plate, and a base end portion thereof is fixed to the inner plate surface of the male joint member 18 by using a holding plate 22 and a bolt 23. . The first shielding plate 20 has a curving ridge slightly curved toward the chamber B side, and abuts against an inner portion adjacent to the slit 15 on the outer surface of the joint member 16 that has its free end. Yes. That is, the gap in the slit 15 formed on one side (inner side) of the male joint member 18 is closed from the chamber B side. No longer flows into the inside.
[0017]
On the other hand, the second shielding plate 21 is also made of an elastically deformable member, for example, a spring steel plate. It is fixed using and. 2 and 3, the second shielding plate 21 has a bent portion 21b bent at a predetermined angle with respect to the base end portion 21a. The tip end portion (free end portion) of the portion 21 b extends in the direction of the inner opening of the slit 15 and abuts against the outer plate surface of the male joint member 18. That is, the gap in the slit 15 formed on the other side (outer side) of the male joint member 18 is closed from the inner side of the female joint member 16, and therefore, even if the caking material is injected into the female joint member 16. The consolidated material does not leak into the water area outside the double sheet pile wall 6. By the way, the bent portion 21b of the second shielding plate 21 slightly bulges and deforms in the direction of the outer opening of the slit 15 due to the pressure of the caking material injected into the female joint member 16, but the second shielding plate By selecting one having an appropriate thickness (strength) as 21, buckling and breakage of the second shielding plate 21 can be prevented and the gap in the slit 15 can be reliably closed from the inside. become.
[0018]
In constructing the water blocking wall 1, the first shielding plate 20 is attached to the inner plate surface of the male joint member 18 and the second shielding plate 21 is attached to the outer surface of the female joint member 16 in advance. Then, as shown in FIG. 5, the box-type sheet pile 10 described above is sequentially driven along the guide frame 5 provided on the gantry 4 fixed on the water bottom ground while being connected via the joint 11. When the box-type sheet pile 10 is placed, the male joint provided at the side end of the succeeding box-type sheet pile 10 in the slit 15 of the joint member 16 provided at the side end of the box-type sheet pile 10 previously placed. While the member 18 is passed (inserted) in the vertical direction, the joint member 16 is fitted into the joint member 16 that engages the locking portion 17 of the male joint member 18, and the both joint members 16 and 18 are connected. In starting the connection, the free end portion of the first shielding plate 20 is appropriately expanded and the free end portion of the second shielding plate 21 is appropriately compressed, so that the slit 15 of the female joint member 16 is compressed. The male joint member 18 is inserted into the inside. After the insertion, the first and second shielding plates 20 and 21 are sequentially expanded and compressed in accordance with the downward movement of the male joint member 18. The free end portion is crimped by an elastic force to the outer surface of the female joint member 16 and the outer plate surface of the male joint member 18.
[0019]
In this way, the box-type sheet pile 10 is sequentially driven along the guide frame 5 while being connected via the main joint 11 to construct the double sheet pile wall 6 in an arch shape with respect to the dam dam body 2 ( 5), after the construction of the double sheet pile wall 6 is completed, the concrete is poured into the chamber A in each box-type sheet pile 10 and the chamber B between the box-type sheet piles 10 placed adjacent to each other. 7 is cast. At this time, the concrete in the chamber B between the box-type sheet piles 10 tends to enter the female joint member 16 through the gap in the slit 15 of the female joint member 16, but as described above, the first shielding. Since the plate 20 closes the gap from the chamber B side, the intrusion of concrete into the chamber B is prevented.
[0020]
Then, after the curing and hardening of the concrete injected into the double sheet pile wall 6 is waited for, a consolidated material is injected into the female joint member 16 and a consolidated material layer 19 is placed. At this time, the consolidated material in the female joint member 16 tries to leak the double sheet pile wall 6 to the outside water area through the gap of the slit 15. However, the second shielding plate 21 receives the pressure of the consolidated material. The bent portion 21b bulges and deforms in the direction of the outer opening of the slit 15, and the free end thereof is strongly pressed against the outer plate surface of the male joint member 18, whereby the solidified material from the female joint member 16 is removed. Leakage is prevented. Then, the consolidated material in the female joint member 16 is cured as it is, and the locking portion 17 of the joint member 18 is rigidly connected in the female joint member 16, thereby completing the construction of the water blocking wall 1.
[0021]
In addition, the water blocking wall 1 constructed in this way has its concrete layer 7 edged between the pair of plates 13a and 13b in the box-type sheet pile 10 as described above. If the face plate 12a of the frame body 12 is cut in the vertical direction (perpendicular to the paper surface) between the two plate bodies 13a and 13b after the completion of the opening of the intake port 3 to the water stop wall 1, It is in a state of being divided into a plurality of parts between one plate 13a in one box-type sheet pile 10 adjacently placed and the other plate 13b in the other box-type sheet pile 10. Can be dismantled.
[0022]
Here, as shown in FIG. 7, the female joint member 16 gradually expands the groove toward the outer opening direction of the slit 15 on the end surface of the slit 15 on the side where the second shielding plate 21 is fixed. It is good also as a shape which attaches the taper 26 to do. By attaching the taper 26 in this manner, when the male joint member 18 is connected to the joint member 16 which is the female joint member 18 passing through the slit 15 in the vertical direction, the male joint member 18 is formed on the end face of the slit 15 as shown in FIG. Since the inner edge is preferentially contacted, the second shielding plate 21 is not compressed and deformed more than necessary, and buckling or damage of the shielding plate 21 is prevented in advance.
[0023]
The first shielding plate 20 attached to the male joint member 18 and the second shielding plate 21 attached to the female joint member 16 may be divided into a plurality of parts in the vertical direction. FIG. 8 shows an embodiment in which the shielding plate is divided as described above, taking the second shielding plate 21 as an example. In this case, each of the dividing elements 27a, 27b,. The joint member 16 is arranged such that the end portions are overlapped with each other so that the lower one overlaps the back surface side of the upper one of the upper members of the upper and lower ends of the upper member of the upper member. To be fixed to the outer surface of the. By arranging the split elements 27a, 27b in this way, even if the joint member 18 is inserted in the slit 15 (FIG. 1) of the female joint member 16 in the vertical direction, the upper end edges of the split elements 27a, 27b are inserted. The box-type sheet pile 10 can be smoothly connected without being caught by the joint member 18. In addition, in the case of such a divided configuration, it is not necessary to prepare a long monolith as the first shielding plate 20 and the second shielding plate 21, and the manufacture thereof is simplified.
[0024]
Furthermore, when constructing the water blocking wall 1, the door stop portion is formed by inserting a part of the double sheet pile wall 6 through the seal member 9 into the longitudinal groove 8 formed in the dam dam body 2 as described above. (FIG. 6), when forming the door stop, as shown in FIG. 9, the female joint member 16 constituting the joint 11 is used as a lifting rail of the excavator 30. Can do. In this case, a pair of locking members 32 corresponding to the male joint member 18 of the main joint 11 are provided on the back surface of the base 31 that supports the excavator 30, and the base 31 is hung on an appropriate work machine. While the locking member 32 is inserted into the slit 15 of each female coupling member 16, the locking member 33 is fitted to the female coupling member 16 at the tip of the locking member 32, and the excavator 30 is gradually moved downward while The longitudinal groove 8 is excavated by a cutter (not shown) of the excavator 30. And after excavation of this vertical groove 8, a box-type sheet pile having an appropriate width is connected to the preceding box-type sheet pile 10 using the joint 11, and a part thereof is fitted into the vertical groove 8, Concrete is laid in the interior to complete the door stop.
[0025]
Here, after excavation of the vertical groove 8, the excavator 30 must be moved up and removed from the joint member 16 for engaging the locking member 32. At this time, the split elements 27a, 27b,. When the excavator 30 is moved upward, the upper edge of the locking member 32 interferes with the lower edges of the split elements 27a, 27b. , It becomes difficult to extract. In this case, as shown in FIG. 10, it is desirable to attach a taper 33 inclined upward toward the inner opening of the slit 15 at the lower end edge of each of the dividing elements 27a, 27b. Therefore, the locking member 32 does not interfere with each of the dividing elements 27a, 27b.
[0026]
In the said embodiment, although the coupling 11 used for the connection of the box-type sheet pile 10 which comprises the double sheet pile wall 6 was shown, the coupling which concerns on this invention has other types of sheet piles, for example, a steel pipe sheet pile, a concrete sheet pile, etc. Of course, it may also be used for the connection. FIG. 11 shows a joint 41 used to connect the steel pipe sheet piles 40, 40. Here, a female joint member 43 having a slit 42 in the vertical direction is connected to the peripheral surface of one steel pipe sheet pile 40 at the tip. A male joint member 45 having a stopper 44 is fixed to the peripheral surface of the other steel pipe sheet pile 40. Also in this joint 41, by attaching a shielding plate 46 similar to that in the above embodiment to a portion of the outer surface of the female joint member 43 adjacent to the slit 42, the consolidated material injected into the female joint member 43 Leakage to the outside can be prevented.
[0027]
The shielding plates (second shielding plates) 21 and 46 are formed on the outer surface of the female joint member 43 depending on the intended use of the continuous sheet pile wall to be constructed or the environment (water, air) around the continuous sheet pile wall. It is attached to one side part or both side parts adjacent to the slit 42, and naturally it can be applied to other than the water blocking wall.
[0028]
【Example】
A laboratory leak test was conducted using a pseudo-joint 50 as shown in FIG. For the pseudo joint 50, a U-shaped angle member 51 having a cross-sectional dimension of 100 × 100 × 12 (mm) and a length of 2 m is prepared, and flange members 52 and 52 are attached to the angle member 51 on both sides. Are connected to a support plate 54 provided with slits 53 having various distances S and predetermined depths D by bolts and nuts 55, and various thicknesses t are provided on one side of the support plate 54 adjacent to the slits 53. The base end portion of the shield plate 56 made of spring steel plate (JIS SUP) having a fixed shape is fixed, and the free end portion of the shield plate 56 extends in the direction of the inner opening of the slit 53, so that the end surface on the other side of the slit 53 It has a structure to make a collision.
In the test, the lower end and the upper end opening of the angle member 51 are closed with a lid (not shown), and pseudo cement milk (bentonite) is pumped by changing the pressure stepwise through a pipe 58 with a valve 57 therein. The leakage from the slit 53 was observed.
The test condition is that the slit 53 is set to have two intervals S of 5 mm and 10 mm, the depth D is constant at 25 mm, and the thickness t is 0.2 mm, 0.3 mm, 0.5 mm, 0.6 as the shielding plate 56. select the one of the mm, injection pressure of the pseudo cement milk graduated between ^{98kPa (1kgf / cm 2) ~588kPa} (6kgf / cm 2). The injection pressure of 5 to 6 kgf / cm ² corresponds to an injection height of about 10 m in terms of mortar. The results are collectively shown in FIG.
[0029]
From the results shown in FIG. 13, the shielding plate 56 having a thickness t of 0.2 mm breaks at a pressure of about 2 kgf / cm ² even when the distance S between the slits 53 is as narrow as 5 mm, and there is a problem in its use. I understood. Further, in the shielding plate 56 having a thickness t of 0.3 mm, when the gap S between the slits 53 was as narrow as 5 mm, no leakage occurred even at an injection pressure of 6 kgf / cm ² , but the gap S between the slits 53 was 10 mm. As it became wider, leakage occurred at 5 kgf / cm ² , and it was found that the interval S between the slits 53 needs to be set appropriately. On the other hand, the shielding plate 56 with a thickness t of 0.5 mm or more does not leak up to an injection pressure of 6 kgf / cm ² regardless of whether the interval S between the slits 53 is 10 mm or 10 mm. It turned out that there was no problem at all.
[0030]
【The invention's effect】
As described above in detail, according to the joint of the continuous sheet pile wall according to the present invention, it is possible to reliably prevent the leakage of the consolidated material from the female joint member even if the periphery of the joint is an air region or a water region. It is suitable for the connection of continuous sheet pile walls for earth retaining, water stopping, and the like.
[Brief description of the drawings]
FIG. 1 is a plan view showing a structure of a joint portion of a water blocking wall constructed using a joint according to the present invention.
FIG. 2 is a plan view of the joint according to the present invention.
FIG. 3 is a perspective view showing a part of the joint according to the present invention.
FIG. 4 is a plan view showing a main structure of a water blocking wall constructed using this joint.
FIG. 5 is a plan view showing the overall structure of a water blocking wall constructed using this joint.
FIG. 6 is a plan view showing the structure of a door stop portion of a water blocking wall constructed using this joint.
FIG. 7 is a plan view showing a deformed structure of the joint according to the present invention.
FIG. 8 is a perspective view showing another modified structure of the joint according to the present invention.
FIG. 9 is a plan view showing a use mode when the joint is used for excavation of a door stop portion of a water blocking wall.
FIG. 10 is a perspective view showing a preferred embodiment of this joint when used for excavation of a door stop portion of a water blocking wall.
FIG. 11 is a plan view showing the structure of a joint according to the present invention used for connecting steel pipe piles.
FIG. 12 is a plan view showing the structure of a pseudo joint used in the test.
FIG. 13 is a chart showing a result of a leak test performed using a pseudo joint.
FIG. 14 is a plan view showing a joint having a conventional rigid fitting structure.
[Explanation of symbols]
1 Water stop wall 6 Double sheet pile wall (continuous sheet pile wall)
7 Concrete layer 10 Box-type sheet piles 11 and 41 Joints 15 and 42 Slits 16 and 43 Female joint members 17 and 44 Locking parts 18 and 45 Male joint members 19 Solid material layer 21 Shielding plate 24 Press plate 25 Bolts 27a and 27b, 27c Splitting element of shielding plate

Claims

It is a joint which connects between sheet piles, and makes it a continuous sheet pile wall, Comprising: The cylindrical female joint member which protruded in the side end of one sheet pile placed adjacently and which has the slit of the vertical direction And a locking portion that can be inserted into the female joint member at the tip, and extends from the side end of the other sheet pile, and passes through the slit in the vertical direction to fit the locking portion into the female coupling member. A joint having a plate-shaped male joint member to be joined, and the joint member being rigidly coupled by a solidified material filled in the female joint member, adjacent to the slit on the outer surface of the female joint member A base end portion of a steel plate shielding plate that can be elastically deformed is fixed to one side or both side portions, and a free end portion of the bent portion of the shielding plate bent with respect to the base end portion is opened inside the slit. Extending in the direction and abutting against the plate surface of the male joint member. Fitting of the continuous sheet pile wall.

The continuous sheet pile wall according to claim 1, wherein at least an end face of the female joint member on the side to which the shielding plate is fixed is tapered to gradually widen the groove toward the outer opening direction of the slit. Fittings.

The shielding plate is divided into a plurality of parts in the vertical direction, and each of the divided elements is arranged with its end portions wrapped so that the lower ones overlap the back side of the upper one. The joint of the continuous sheet pile wall as described in 2.

4. The sheet pile wall joint according to claim 1, wherein the sheet pile is a box-type sheet pile, and a female joint member and a male joint member are provided on each side of the box-type sheet pile. .