JP3880403B2

JP3880403B2 - Method and structure for preventing the formation of water pipes

Info

Publication number: JP3880403B2
Application number: JP2002007557A
Authority: JP
Inventors: 成樹天野; 優一柴尾; 潤山田
Original assignee: Dainippon Plastics Co Ltd
Current assignee: Dainippon Plastics Co Ltd
Priority date: 2002-01-16
Filing date: 2002-01-16
Publication date: 2007-02-14
Anticipated expiration: 2022-01-16
Also published as: JP2003213653A

Description

【０００１】
【発明の属する技術分野】
この発明は、樋管の水みち形成防止方法およびその構造に関し、更に詳しくは、河川、ため池等の堤防に埋設される樋管の近傍に水みち（水抜け路）が形成されるのを防止する水みち形成防止方法およびその構造に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
従来より、河川の水を別の場所へ導く手段として、河川の堤防に比較的大型の樋管（又は撓み性排水管）が埋設されることがある。これは河川が増水した時の水量の調節、堤防の決壊の防止のために設けられることもあるが、河川から用水（例えば農業用水）として取水する手段としても用いられている。しかしながら、樋管が堤防下を横断して埋設されるために、樋管に沿って水みち（水の通り道、水抜け路）が形成され、その結果、樋管近傍の土壌が削り取られ、樋管の沈下が起こり、樋管が破裂したり最悪の場合には堤防が陥落することがある。
【０００３】
そこで、上記の問題を解決する手段として、地中に埋設される樋管の外周に、水みちの形成を防止するための遮水壁を取り付け、さらにこの遮水壁を矢板に連結するものがある。しかし、遮水壁の材質や、樋管および矢板への取付け、連結方法によっては、作業性が悪く、さらに地盤の沈下が生じた際に遮水壁が追随できず、樋管と遮水壁の位置関係に無理が生じ、結果として樋管の破損を引き起こすことがあった。
特に、遮水壁と矢板との連結では、板状の遮水壁に対して矢板がコルゲート状（波形状）という合致し難い形状であるために、ボルトやナットを用いる通常の方法では極めて難しい作業を必要とした。
【０００４】
一方、樋管に遮水壁を取付ける点について、地盤の沈下に対処したものとしては特開平８−６８０３１号に開示された樋管まわりの水みち防止構造を挙げることができる。この樋管まわりの水みち防止構造は、樋管と、樋管の軸心方向に移動自在な取り付け用リング体と、この取り付け用リング体の外周部に設けられる弾性体と、この弾性体の外周部に取り付けられる遮水壁とから主として構成されるものであって、取り付け用リング体と遮水壁との間に弾性体を介在させ、リング体の軸心方向への移動性と弾性体の柔軟性とを利用することによって、地盤の沈下に遮水壁を追随させ、樋管との位置関係に無理が生じないようにしたものである。
【０００５】
また、同様の問題に対処したものとして、特開平８−１４４２４８号に開示された樋管まわりの水みち防止構造を挙げることができる。この樋管まわりの水みち防止構造は、樋管と、樋管の軸心方向に移動自在な取り付け用リング体と、弾性体からなる遮水壁とから主として構成されるものであって、リング体の軸心方向への移動性に加えて、遮水壁自体を弾性体とすることによって、地盤の沈下に遮水壁を追随させ、樋管との位置関係に無理が生じないようにしたものである。
【０００６】
しかし、これらの水みち形成防止構造（以下、水みち形成防止樋管構造と称することもある）を実際に施工するには、遮水壁に形成された通孔部に樋管を挿通する作業が必要であり、更には、取り付けリングを樋管の外周部に沿って軸心方向に移動させ、所望の位置に固定させる作業が必要となり、大変な労力を必要とし、作業性が非常に悪かった。また、その他の問題として、弾性体からなる遮水壁にはその柔軟性のために、施工時の形状保持（自立）が難しいという問題があり、実際には弾性体からなる遮水壁の外周縁部に剛性のあるフレームを取り付けなければならなかった。また更なる他の問題として、遮水壁に用いられる弾性体は一般的に値段が高く、ポリエチレンなどのプラスチック材料に比べて重量が重く、更には、運搬時にロール状に巻いて運ぶため巻癖が残るなどの点から、経済性、運搬性、施工性に劣るという指摘もあった。
【０００７】
【課題を解決するための手段】
この発明は、樋管を地中に埋設するに際し、通孔を有する遮水壁と矢板とを、遮水壁の通孔に樋管を通し、かつ遮水壁を矢板に連結して、地中にそれぞれ埋設し、樋管まわりに水みちが形成されるのを防止する樋管の水みち形成防止方法において、遮水壁が、略方形であり、その両側辺と底辺とに沿って、断面をコ字状とし、かつそのコ字状の開口部分を外向きとする断面コ字状辺縁部を有し、
遮水壁を矢板に連結するに際して、遮水壁の断面コ字状辺縁部内に、矢板の対応辺を挿入し、次いで断面コ字状辺縁部と挿入された矢板の対応辺との間に生コンクリートを注入して硬化させ一体化することを特徴とする樋管の水みち形成防止方法を提供する。
【０００８】
すなわち、この発明は、略方形の遮水壁の両側辺と底辺に沿って断面コ字状辺縁部を有し、遮水壁を矢板に連結するに際して、遮水壁の断面コ字状辺縁部内に、矢板の対応辺を挿入し、次いで断面コ字状辺縁部と挿入された矢板の対応辺との間に生コンクリートを注入して硬化させ一体化させることによって、ボルトやナットを用いる場合とは異なり、固定するもの同士の寸法上のバラツキを広い範囲で許容できるので、作業性を大幅に改善できる。
ここで、矢板は、通常そのコルゲート（波）の幅を４００〜５００ｍｍとし、全高さを１００〜１５０ｍｍとしているので、略方形の遮水壁の両側辺と底辺に沿って形成される断面コ字状辺縁部は、そのコ字状の開口幅を２００〜５００ｍｍとし、奥行きを３００〜６００ｍｍとするのが好ましい。このように形成された断面コ字状辺縁部内に矢板を挿入し、次いでこの矢板と断面コ字状辺縁部との間に生コンクリートを注入して硬化させ、遮水壁と矢板を一体化するわけである。
さらに、本発明は、従来の遮水壁に相当する部材を一対の分割壁部で構成することにより、従来のように樋管を遮水壁の通孔部に挿通する作業を不要とし、施工期間の大幅短縮を可能とするとともに、遮水壁の製造装置を小形化できるので、施工費に加えて製作費の削減も達成することができる。
さらに本発明は、通孔を有する略方形の遮水壁を、内フレームと、第１弾性体と、前記内フレームの両側辺および底辺から前記第１弾性体を介して外側に延びる外フレームとで構成し、遮水壁の断面コ字状辺縁部を、前記外フレームの両側辺および底辺に沿って形成することによって、第１弾性体の弾性を生かして内フレームと外フレームとのズレ、つまり樋管と矢板との位置のズレを許容できるようにすることができる（例えば地盤の沈下への追随性を向上させることができる）。
さらに本発明は、遮水壁の通孔に樋管を通すに際して、樋管と、遮水壁の通孔との間に第2弾性体を介在させることができ、またこの第2弾性体を帯状に構成し、樋管と、遮水壁の通孔との間に第2弾性体を介在させるに際して、第2弾性体を樋管に予め巻着し、次いで樋管を、巻着した第2弾性体を介して遮水壁の通孔に通すこともできる。
本発明は、別の観点によれば、樋管、通孔を有する遮水壁および矢板を、遮水壁の通孔に樋管を通し、かつ遮水壁を矢板に連結して地中にそれぞれ埋設し、樋管まわりに水みちが形成されるのを防止する樋管の水みち形成防止構造において、遮水壁が略方形であり、この遮水壁と矢板とを連結する連結部が、
遮水壁の両側辺と底辺に沿って形成され、断面をコ字状とし、かつそのコ字状の開口部分を外向きとする断面コ字状辺縁部と、
この断面コ字状辺縁部内に挿入された矢板の対応辺縁部と、
遮水壁の断面コ字状辺縁部と挿入された矢板の対応辺縁部との間に注入され硬化されたコンクリート体と
からなる樋管の水みち形成防止構造を提供できる。
【０００９】
【発明の実施の形態】
以下、この発明に係る水みち形成防止方法およびその構造の具体的な基本構成について述べる。
まず、この発明に係る水みち形成防止構造または樋管構造の基本構成は、地中に埋設される樋管と、帯状の弾性体と、樋管の外形に対応する形状の切り欠き部を有する一対の分割壁部と、各分割壁部に装着され、両分割壁部を樋管に固定するための一対の分割枠体とからなる基本構成を備えているが、更に、これらの樋管、弾性体、分割壁部、及び分割枠体に加えて、現場で分割壁部の分割辺部分を接合するために、分割辺部分にそれぞれ取り付けられる接合片を主として備えている。
【００１０】
まず、地中に埋設される樋管は、その形状として特に限定されないが、断面円形、楕円形、正方形などの管を挙げることができ、具体的には円管であることが好ましく、直径５００〜３０００ｍｍ、肉厚２０〜２００ｍｍ程度の合成樹脂管であることが更に好ましい。そしてその材料は好ましくは硬質熱可塑性樹脂であって、具体的にはポリエチレンであることが更に好ましい（高耐圧ポリエチレン管）。
【００１１】
次に帯状の弾性体（第2弾性体）は、一定の厚みと幅をもつ帯状であって、樋管の外周と、後述の分割壁部の切り欠き部及びその切り欠き部に装着される分割枠体との間に介在されるものであり、樋管と切り欠き部及び分割枠体との間をシールするために設けられるものであるが、地盤の沈下の際にその弾性を活かして、樋管と一対の分割壁部（遮水壁）との位置関係のずれを吸収できるようにして両者に機械的な無理が生じないようにする効果もある。具体的な厚みとしては、地中に埋設された際の樋管の変形を考慮して、樋管の外径の１〜２％であることが好ましく、この分野でよく用いられる直径１０００ｍｍ以上の樋管の場合においては、その標準的な厚みを２０ｍｍ〜３０ｍｍとすることができる。
【００１２】
しかし、上述のように地盤沈下に対する一対の分割壁部の追随性を向上させる等の目的により、その厚みは限定されず、５ｍｍ〜１００ｍｍ程度の範囲内で適宜選択することができる。また、弾性体の幅については、分割壁部の厚さや、後述の分割枠体の大きさを考慮して決定されるが、その標準的な幅は１６０ｍｍ前後とすることができる。
【００１３】
更に、この弾性体に用いられる材質としては、ゴム類、すなわち天然ゴム、合成ゴム、熱可塑性エラストマーを挙げることができる。具体的にはクロロプレンゴム、ニトリルゴム、スチレンブタジエンゴムを用いるのが好ましい。更にそれらの天然ゴム、合成ゴム、熱可塑性エラストマーに高吸水性ポリマー、例えばポリアクリル酸ナトリウムや、アクリル酸とポリビニルアルコールとの共重合体、アクリル酸とアクリルアミドとの共重合体などを混合した複合体〔この複合体は、通常水膨張ゴム又は水膨潤ゴムと呼ばれる〕を用いることもできる。このような複合体を弾性体として用いれば、装着後の水分吸水によって体積膨張させることができ、それによってシール効果を更に高めることができるので好ましい。
【００１４】
次に一対の分割壁部について述べる。この発明においては一対の分割壁部を現場で接合することにより１つの遮水壁となるように構成されている。そしてその接合された状態である遮水壁は、正面視で略方形であることが好ましく、更にその略中央部分には樋管の外形に対応する輪郭の通孔部が形成されており、具体的には円形の通孔部が形成されていることが好ましい。
【００１５】
すなわち、遮水壁を２分割した状態である一対の分割壁部の遮水壁の通孔部に相当する部分は、樋管の外形に略一致する切り欠き部が形成されており、具体的には上述の弾性体の厚みにもよるが、樋管の外径プラス２０ｍｍ程度の直径を有する半円形の切り欠き部にそれぞれ形成されているのが好ましい。そして、それらの半円形の切り欠き部には後述の分割枠体がそれぞれ取付られ、一方、分割壁部の分割辺部分（すなわち切り欠き部の両側の直線部分）同士は、後述の接合片を用い、好ましくは同じく後述の弾性片を介して互いに接合され、１つの遮水壁となるのである。
【００１６】
そして、このように１つの遮水壁となることにより、一対の分割壁部の切り欠き部及びその切り欠き部にそれぞれ装着された分割枠体に、樋管の外周面に巻かれた弾性体を押圧する力が発生し、遮水壁は樋管の外周に取付けられるのである。また、上述したように、一対の分割壁部によって遮水壁を構成することによって、従来例の施工時に必要であった、遮水壁の通孔部に樋管を挿通するという、大がかりで非常な労力を伴う作業を不要とすることができるのである。
【００１７】
なお、この発明に係る水みち形成防止樋管構造において、遮水壁の分割方向は上下方向であることが好ましいが、必ずしも上下方向に限定される必要はなく、左右方向や遮水壁の対角線、すなわち斜め方向など、どの様な方向で分割されていてもよい。また、その分割数も２分割であることが好ましいが、それ以上の分割数であってもよい。
【００１８】
また、一対の分割壁部の材料は硬質熱可塑性樹脂、具体的には高密度ポリエチレンであることが好ましく、その厚みは、施工現場の具体的な事情により決定されるが、２０ｍｍ〜４０ｍｍであることが好ましい。これは、この発明に係る水みち形成防止樋管構造の遮水壁を構成する一対の分割壁部には、適度な剛性と適度な弾性という２つの物性が要求されるためである。そして、分割壁部が適度な剛性と適度な弾性を兼ね備えることにより、水みち形成防止樋管構造の施工中に、分割壁部を所望の位置で自立させることを可能にし、それによって施工を容易にすると共に、一対の分割壁部を上述の弾性体を介して樋管に押圧することによって樋管との取付部分に無理な力が加わっても樋管を破損させるのを防止することが可能となるのである。
【００１９】
また、硬質熱可塑性樹脂を用いることで、従来の鉄製やゴム製の遮水壁に対して材料費を削減できるとともに軽量化することができる。特に軽量化は、輸送を簡単にするとともに、施工時の作業性及び安全性の向上、更には施工後の地盤沈下の防止のうえでも好ましいものである。特に、従来のゴム製の遮水壁は輸送時にロール状に巻いて運ぶため、巻き癖がついてしまい、これは施工時の作業性を悪化させる大きな要因であったが、この発明における遮水壁を構成する一対の分割壁部は上述のように自立可能に硬質熱可塑性樹脂で製造されるので、このように作業性を悪化させることはない。
【００２０】
次に分割枠体について述べる。この発明において、分割枠体は金属からなるものが好適に用いられる。そしてその形状としては、樋管の外形に対応する形状であることが要求されるが、好ましくは、複数に分割可能、すなわち分割壁部の切り欠き部に対応した形状であって、円環形状の枠体を上下に２分割した半円形であることが更に好ましい。また、その断面はＬ字形であることが好ましい。そして、このＬ字断面の一面が、一対の分割壁部の切り欠き部の周縁に切り欠き部を取り巻くようにそれぞれ取付けられる。なお、更に好ましくは、この分割枠体は一対の分割壁部の切り欠き部の表裏の周縁、つまり両側にそれぞれ備えられる。このように両側に備えることにより、分割壁部の表裏の２方向から樋管の外周面に巻かれた弾性体を押圧することが可能となり、一対の分割壁部を樋管に対して強固に固定することが可能となるのである。
【００２１】
次に接合片について述べる。この接合片は上述の一対の分割壁部の分割辺部分同士を接合するために備えられるものであり、その材質は分割枠体と同様に金属であることが好ましく、またその断面はＬ字形であることが好ましい。なお、この接合片を用いて分割壁部同士を接合する際には、分割辺部分同士の接合面及び接合片同士の接合面をシールするように板状の弾性片を挟んで接合することが、組み立てられた遮水壁の水みち形成防止効果を向上させるうえで好ましく、この弾性片の材質は、上述の樋管と分割枠体との間をシールする弾性体と同じものが好ましい。
【００２２】
なお、この発明に係る水みち形成防止樋管構造においては、分割壁部の分割辺部分同士を、上述のような接合片及び弾性体を用いることなく、施工現場で溶接することによって接合してもよい。また、その具体的な施工手順については、後述の実施の形態の項で詳細に説明するので、ここではその説明を省略する。
【００２３】
以上、詳細に述べたように、この発明に係る水みち形成防止樋管構造の基本構成は、単純な構成にて、従来の水みち形成防止樋管構造（樋管まわりの水みち防止構造）の問題点であった、大型化や重量化による部品運送の難しさ、作業性の悪さ等の問題点を克服したものであるが、特記すべきは、一対の分割壁部で遮水壁を構成し、また分割枠体もそれら分割壁部に対応した形状としている点において、その施工時の作業性を非常に良好なものとして施工期間を大幅に短縮できる点にある。
【００２４】
以下、この発明に係る水みち形成防止樋管構造の具体的な構成及びその施工手順について図に示す実施の形態に基づいて説明する。なお、これによってこの発明が限定されるものではない。
図１はこの発明に係る水みち形成防止樋管構造の実施の形態の周辺構造説明図である。図２は図１の実施の形態の一部、すなわち遮水壁取付部分付近の正面図である。図３は図１の実施の形態の遮水壁取付部分付近の右側面図である。図４は図１の実施の形態の遮水壁取付部分付近の左側面図である。図５は図１の実施の形態の遮水壁取付部分付近の平面図である。図６は図２のＡ−Ａ線断面図である。図７は図２のＢ−Ｂ線断面図である。図８は分割壁部を樋管へ取付ける手順を示す概略施工図である。
図９はこの発明に係る水みち形成防止樋管構造の実施の形態の全体を示す図２相当図である。図１０は図９のＣ−Ｃ線拡大断面図である。
【００２５】
まず、図１において、この発明に係る水みち形成防止構造の実施の形態である水みち形成防止樋管構造１は、河川２の水を農業用水として他の場所（図示せず）へ導くべく、堤防３に埋設される樋管６と、この樋管６の近傍に生ずるおそれのある水みち（水抜け路）５の形成を防止するための分割壁部１４及び１５から構成される遮水壁７と、後述する第１弾性体としての弾性樹脂製フレーム４２（図９及び図１０参照）と、このフレームを介して遮水壁７から延設された、後述する鋼製フレーム４５（図９及び図１０参照）とから主として構成されている。また、４は樋門、４６は矢板である。
【００２６】
そこで、まず、分割壁部（分割遮水壁部と称することもある）１４及び１５の樋管６への取付け構造、すなわち水みち形成防止樋管構造１の詳細について図２から図７を用いて説明する。
【００２７】
図２から図７、特に図２において示されているように、高密度ポリエチレンからなる樋管６の外周面８に、第2弾性体としての、クロロプレンゴムからなる帯状の弾性体（第２弾性体）９が樋管６の外周面８を取り巻くように配設されている。なお、このクロロプレンゴムは水膨張ゴムとすることもでき、この水膨張ゴムを弾性体９の素材として用いると、樋管６と分割壁部１４及び１５との装着後に水分によって膨潤し、それによってシール性の面でより好ましいものとなる。
分割壁部１４及び１５は、その半円形の切り欠き部分１６の表裏周縁には断面Ｌ字状の半円形の鋼製分割枠体１０ａ、１０ｂ、１１ａ及び１１ｂの一面がそれぞれボルト１２及びナット１３を用いて貫通固定されている。
【００２８】
また、分割壁部１４及び１５の分割辺部分１７の表裏にはそれぞれ断面L字状の接合片１８ａ、１８ｂ、１８ｃ、１８ｄ、１８ｅ、１８ｆ、１８ｇ及び１８ｈがボルト１２及びナット１３を用いて固定され、更に、接合片１８ａと１８ｂ、１８ｃと１８ｄ、１８ｅと１８ｆ、１８ｇと１８ｈが、分割壁部１４と１５の間をシールする板状の弾性片１９及び２０を介してボルト１２及びナット１３を用いて固定され、一つの遮水壁７を構成している。そしてこのように分割辺部分１７が接合され、一つの遮水壁７を構成することにより、上述の分割枠体１０ａ、１０ｂ、１１ａ及び１１ｂの残るもう一面及び分割壁部１４、１５の切り欠き部分１６が弾性体９を押圧し、遮水壁７を樋管６の外周に固定すると共に、樋管６の外周面８と遮水壁７とのシール効果を高めている。
【００２９】
次に、本発明に係る水みち形成防止構造の実際の施工の手順について、以上の構成からなる水みち形成防止樋管構造１を基にして、特に図８を用いて説明する。
この実施の形態の水みち形成防止樋管構造１の実際の施工については、まず、分割壁部１５を所望の位置に設置する。なお、この時に分割壁部１５の切り欠き部分１６には予め分割枠体１０ｂ及び１１ｂを取付けておき、分割辺部分１７には接合片１８ｂ、１８ｄ、１８ｆ、１８ｈを取付けておくことが好ましい。次に、弾性体（第２弾性体）９が巻き付けられた樋管６を、分割壁部１５の切り欠き部分１６の上に載せ、次に、分割壁部１５の分割辺部分１７の上に弾性片１９及び２０を置き、上述の分割壁部１５と同様に取付フレーム１０ａ及び１１ａと接合片１８ａ、１８ｃ、１８ｅ及び１８ｇが予め取り付けられた分割壁部１４を樋管６の上に載せ、ボルト１２及びナット１３を用いて更に接合片同士、すなわち接合片１８ａと１８ｂ、１８ｃと１８ｄ、１８ｅと１８ｆ、１８ｇと１８ｈをそれぞれ弾性片１９、２０を介して固定し、水みち形成防止樋管構造１の施工が完了する。なお、４４は鋼製外フレームであり、その両側辺及び底辺に沿って断面コ字状辺縁部４５を有する。４６は矢板である。
【００３０】
このように、水みち形成防止樋管構造１は、遮水壁７が上下に分割された分割壁部１４及び１５で構成されているので、従来の水みち形成防止樋管構造を施工するうえで必要であった、遮水壁の通孔部に樋管を挿通するという大がかりな作業を不要とすることができ、施工期間の大幅な短縮（例えば１／４〜１／５に短縮）を可能としている。
【００３１】
さて、図９及び１０において、４１は、この発明に係る水みち形成防止樋管構造の実施の形態の全体構成を示し、水みち形成防止樋管構造１として説明した、樋管６と遮水壁７の分割壁部１４及び１５との結合構造に加えて、つまり樋管６と遮水壁４７の分割壁部分５４及び５５との結合構造に加えて第１の弾性体としての板状の弾性樹脂製フレーム４２と、このフレームを介して分割壁部分５４及び５５に延設された鋼製外フレーム４４とを主として備えている。
【００３２】
この水みち形成防止樋管構造４１は、施工後に地盤の沈下が容易に予想できるような場所への設置に適したものであり、遮水壁４７の内フレーム４３の外周部分に弾性樹脂製フレーム４２がボルト１２及びナット１３で固定されている。そしてこの弾性樹脂製フレーム４２の更に外周部分には鋼製外フレーム４４がボルト１２及びナット１３で固定されているわけである。
鋼製フレーム４４は、その両側辺および底辺に断面コ字状辺縁部４５、つまり外周方向に開口するコ字状断面を有し、この断面コ字状辺縁部４５の内部に、周囲の地中に差し込まれた矢板４６の側辺部を差し込んで現場で、遮水壁４７の断面コ字状辺縁部４５と矢板４６の対応辺との間の両上端開口（図示省略）と、断面コ字状辺縁部４５の小孔４９（図８参照）とを介してコンクリート５０を流し込むことによって矢板４６を固定する。従って、この矢板４６のコンクリート５０を用いた固定方法は、ボルトやナットを用いる場合とは異なり、固定するもの同士の寸法上のバラツキをかなりの範囲で許容できるので、作業性を大幅に改善できる。
【００３３】
なお、この実施の形態の水みち形成防止樋管構造４１は、弾性樹脂製フレーム４２を遮水壁４７の内フレーム４３の外周部分に備えることにより、弾性樹脂製フレーム４２の弾性を活かして地盤の沈下への追随性を更に向上させたものである。
【００３４】
【発明の効果】
この発明によれば、略方形の遮水壁の両側辺と底辺に沿って断面コ字状辺縁部を有し、遮水壁を矢板に連結するに際して、遮水壁の断面コ字状辺縁部内に、矢板の対応辺を挿入し、次いで断面コ字状辺縁部と挿入された矢板の対応辺との間に生コンクリートを注入して硬化させ一体化させることによって、ボルトやナットを用いる場合とは異なり、固定するもの同士の寸法上のバラツキを広い範囲で許容できるので、作業性を大幅に改善できる。
さらに、遮水壁を一対の分割壁部で構成すると、従来の水みち形成防止方法において必要であった、遮水壁の通孔部に樋管を挿通する作業を不要とすることができる。
【図面の簡単な説明】
【図１】この発明に係る水みち形成防止樋管構造の実施の形態の周辺構造説明図である。
【図２】図１の実施の形態の遮水壁取付部分付近の拡大正面図である。
【図３】図１の実施の形態の遮水壁取付部分付近の拡大右側面図である。
【図４】図１の実施の形態の遮水壁取付部分付近の拡大左側面図である。
【図５】図１の実施の形態の遮水壁取付部分付近の拡大平面図である。
【図６】図２のＡ−Ａ線断面図である。
【図７】図２のＢ−Ｂ線断面図である。
【図８】分割壁部を樋管へ取付ける手順を示す概略施工図である。
【図９】この発明に係る水みち形成防止樋管構造の実施の形態を示す図２相当図である。
【図１０】図９のＣ−Ｃ線拡大断面図である。
【符号の説明】
１・・・水みち形成防止樋管構造
２・・・河川
３・・・堤防
４・・・樋門
５・・・水みち
６・・・樋管
７・・・遮水壁
８・・・外周面
９・・・弾性体（第２弾性体）
１０，１１・・・分割枠体
１２・・・ボルト
１３・・・ナット
１４，１５・・・分割壁部
１６・・・切り欠き部分
１７・・・分割辺部分
１８・・・接合片
１９，２０・・・弾性片
４１・・・水みち形成防止樋管構造
４２・・・弾性樹脂製フレーム（第１弾性体）
４３・・・内プレート
４４・・・鋼製外フレーム
４５・・・断面コ字状辺縁部
４６・・・矢板
４７・・・遮水壁
４９・・・小孔
５０・・・コンクリート
５４，５５・・・分割壁部分[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for preventing the formation of a waterway in a dredging pipe, and its structure, and more specifically, prevents a waterway (water drainage path) from being formed in the vicinity of a dredging pipe buried in a bank, river, pond or the like. The present invention relates to a method for preventing water from forming and a structure thereof.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, as a means for guiding river water to another place, a relatively large dredged pipe (or flexible drain pipe) may be embedded in a river dike. This may be provided to adjust the amount of water when the river increases, or to prevent breakage of the dike, but it is also used as means for taking water from the river as irrigation water (for example, agricultural water). However, because the dredging pipe is buried under the embankment, a water channel (water passageway, drainage channel) is formed along the dredging pipe, and as a result, the soil in the vicinity of the dredging pipe is scraped off. Pipe subsidence can occur and the tub can rupture or in the worst case the levee can fall.
[0003]
Therefore, as a means for solving the above problem, there is one that attaches a water shielding wall for preventing the formation of a water channel to the outer periphery of the vertical pipe buried in the ground, and further connects this water shielding wall to a sheet pile. is there. However, depending on the material of the impermeable wall, the attachment to the pipe and sheet pile, and the connection method, the workability is poor, and when the ground sinks, the impermeable wall cannot follow. The positional relationship between the two was unreasonable, and as a result, the fistula was damaged.
In particular, in the connection between the impervious wall and the sheet pile, the sheet pile has a corrugated shape (corrugated shape) that is difficult to match with the plate-shaped impermeable wall, so it is extremely difficult to use a normal method using bolts and nuts. Needed work.
[0004]
On the other hand, as a countermeasure against ground subsidence in terms of attaching a water-impervious wall to a dredger pipe, there is a water-bump prevention structure around a dredger pipe disclosed in Japanese Patent Laid-Open No. 8-68031. The structure for preventing water around the soot tube includes a soot tube, a mounting ring body movable in the axial direction of the soot tube, an elastic body provided on the outer periphery of the mounting ring body, It is mainly composed of a water-impervious wall attached to the outer periphery, and an elastic body is interposed between the mounting ring body and the water-impervious wall so that the mobility of the ring body in the axial direction and the elastic body By using this flexibility, the impermeable wall is made to follow the subsidence of the ground so that the positional relationship with the soot pipe does not become unreasonable.
[0005]
Further, as a countermeasure against the same problem, there can be mentioned a structure for preventing water around the soot pipe disclosed in JP-A-8-144248. This structure for preventing water around the soot pipe is mainly composed of a soot pipe, a mounting ring body movable in the axial direction of the soot pipe, and a water shielding wall made of an elastic body. In addition to the mobility in the axial direction of the body, by making the impermeable wall itself an elastic body, the impermeable wall is made to follow the subsidence of the ground, so that it does not cause unreasonable positional relationship with the pipe. Is.
[0006]
However, in order to actually construct these water channel formation prevention structures (hereinafter also referred to as water channel formation prevention dredging pipe structures), the work of inserting the dredging pipes into the through holes formed in the impermeable walls In addition, it is necessary to move the mounting ring in the axial direction along the outer periphery of the soot tube and fix it in the desired position, which requires a lot of labor and the workability is very poor. It was. Another problem is that the shape of the impermeable wall made of elastic material is difficult to maintain (self-standing) during construction because of its flexibility. A rigid frame had to be attached to the periphery. As yet another problem, the elastic body used for the impermeable wall is generally expensive and is heavier than plastic materials such as polyethylene. Some pointed out that it is inferior in economic efficiency, transportability, and workability from the viewpoint of remaining.
[0007]
[Means for Solving the Problems]
In the present invention, when burying a dredge in the ground, the impermeable wall having a through hole and a sheet pile are inserted into the through hole of the impermeable wall and the impermeable wall is connected to the sheet pile, In the method of preventing the formation of a water channel around the vertical pipe, each of the water blocking walls is substantially square, and along its both sides and bottom, It has a U-shaped cross-section and has a U-shaped cross-sectional edge with the U-shaped opening facing outward,
When connecting the impermeable wall to the sheet pile, insert the corresponding side of the sheet pile into the U-shaped edge of the cross section of the impermeable wall, and then between the U-shaped edge of the inserted sheet pile and the corresponding edge of the inserted sheet pile The present invention provides a method for preventing the formation of a water pipe in a dredging pipe, which comprises injecting fresh concrete into a solid and curing and integrating.
[0008]
That is, this invention has a U-shaped cross-sectional edge along both sides and the bottom of the substantially square impermeable wall, and when the impermeable wall is connected to the sheet pile, the cross-sectional U-shaped side of the impermeable wall Insert the corresponding side of the sheet pile into the edge, and then inject the ready-mixed concrete between the edge of the U-shaped cross section and the corresponding side of the inserted sheet pile to harden and integrate the bolts and nuts. Unlike the case where it is used, the dimensional variation between the objects to be fixed can be allowed in a wide range, so that the workability can be greatly improved.
Here, since the sheet pile usually has a corrugated (wave) width of 400 to 500 mm and an overall height of 100 to 150 mm, the U-shaped cross section is formed along both sides and the bottom of the substantially rectangular impermeable wall. It is preferable that the U-shaped opening has a U-shaped opening width of 200 to 500 mm and a depth of 300 to 600 mm. Insert a sheet pile into the U-shaped edge of the cross section formed in this way, and then inject and harden the ready-mixed concrete between the sheet pile and the U-shaped edge of the cross section to integrate the impermeable wall and the sheet pile together. That is why.
Furthermore, the present invention eliminates the work of inserting the soot pipe into the through-hole portion of the water-impervious wall as in the prior art by constructing a member corresponding to the conventional water-impervious wall with a pair of divided wall portions. The period can be greatly shortened, and the manufacturing equipment for the impermeable wall can be miniaturized, so that the production cost can be reduced in addition to the construction cost.
Furthermore, the present invention provides a substantially rectangular water-impervious wall having a through hole, an inner frame, a first elastic body, and an outer frame extending outward from both sides and a bottom side of the inner frame via the first elastic body. And forming the U-shaped cross-sectional edge of the impermeable wall along both sides and the bottom of the outer frame, thereby utilizing the elasticity of the first elastic body to shift the inner frame from the outer frame. In other words, it is possible to allow the displacement of the position between the tub tube and the sheet pile (for example, the followability to the settlement of the ground can be improved).
Further, the present invention allows a second elastic body to be interposed between the soot pipe and the through hole of the impermeable wall when passing the soot pipe through the through hole of the impermeable wall. When the second elastic body is interposed between the soot pipe and the through hole of the impermeable wall, the second elastic body is pre-wound around the soot pipe, and then the soot pipe is wound around. 2 It is possible to pass through the hole of the impermeable wall through the elastic body.
According to another aspect of the present invention, a dredging pipe, a water shielding wall having a through hole, and a sheet pile are passed through the through hole of the water shielding wall, and the water shielding wall is connected to the sheet pile into the ground. In the structure for preventing the formation of a water channel around the soot pipe, the water shielding wall has a substantially rectangular shape, and a connecting portion for connecting the water shielding wall and the sheet pile is provided. ,
A cross-sectional U-shaped side edge formed along both sides and bottom of the impermeable wall, having a U-shaped cross section, and the U-shaped opening portion facing outward,
The corresponding edge of the sheet pile inserted into this U-shaped cross-section edge,
A concrete body injected and hardened between the U-shaped cross-sectional edge of the impermeable wall and the corresponding edge of the inserted sheet pile;
It is possible to provide a structure for preventing the formation of water ducts in the tub tube.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the following, a water channel formation preventing method and a specific basic structure of the structure according to the present invention will be described.
First, the basic structure of the water channel formation preventing structure or dredging structure according to the present invention has a dredging pipe buried in the ground, a belt-like elastic body, and a cutout portion having a shape corresponding to the outer shape of the dredging pipe. It has a basic configuration comprising a pair of divided wall parts and a pair of divided frame bodies that are attached to each divided wall part and fix the both divided wall parts to the vertical pipes. In addition to the elastic body, the divided wall portion, and the divided frame body, in order to join the divided side portions of the divided wall portion at the site, mainly provided are joining pieces respectively attached to the divided side portions.
[0010]
First, the pipe buried in the ground is not particularly limited as the shape thereof, but can include pipes having a circular cross section, an ellipse, a square, etc., and is preferably a circular pipe, and has a diameter of 500 It is more preferable that the synthetic resin pipe has a thickness of about ˜3000 mm and a thickness of about 20 to 200 mm. The material is preferably a hard thermoplastic resin, more specifically polyethylene (high pressure polyethylene pipe).
[0011]
Next, the belt-like elastic body (second elastic body) is a belt-like shape having a certain thickness and width, and is attached to the outer periphery of the soot tube, the cutout portion of the divided wall portion described later, and the cutout portion thereof. It is interposed between the divided frame body and is provided to seal between the tub tube and the notch and the divided frame body, but it makes use of its elasticity when the ground sinks Further, it is possible to absorb the displacement of the positional relationship between the soot tube and the pair of dividing wall portions (water-impervious walls) and to prevent mechanical unreasonableness from occurring. The specific thickness is preferably 1 to 2% of the outer diameter of the soot tube in consideration of deformation of the soot tube when buried in the ground, and has a diameter of 1000 mm or more often used in this field. In the case of a soot tube, the standard thickness can be 20 mm-30 mm.
[0012]
However, as described above, the thickness is not limited for the purpose of improving the followability of the pair of dividing walls with respect to ground subsidence, and can be appropriately selected within a range of about 5 mm to 100 mm. The width of the elastic body is determined in consideration of the thickness of the divided wall portion and the size of the divided frame described later, but the standard width can be about 160 mm.
[0013]
Furthermore, examples of the material used for the elastic body include rubbers, that is, natural rubber, synthetic rubber, and thermoplastic elastomer. Specifically, chloroprene rubber, nitrile rubber, and styrene butadiene rubber are preferably used. Furthermore, natural rubber, synthetic rubber, and thermoplastic elastomer are mixed with superabsorbent polymers such as sodium polyacrylate, copolymers of acrylic acid and polyvinyl alcohol, and copolymers of acrylic acid and acrylamide. The body [this complex is usually called water-expanded rubber or water-swollen rubber] can also be used. Use of such a composite as an elastic body is preferable because it can be volume-expanded by water absorption after mounting, thereby further enhancing the sealing effect.
[0014]
Next, a pair of division wall parts will be described. In this invention, it is comprised so that it may become one water-impervious wall by joining a pair of division wall part on-site. The water-impervious wall in the joined state is preferably substantially rectangular in front view, and further, a substantially through-hole portion corresponding to the outer shape of the soot tube is formed in the substantially central portion thereof. Specifically, it is preferable that a circular through hole is formed.
[0015]
That is, a portion corresponding to the through-hole portion of the water shielding wall of the pair of divided wall portions in a state where the water shielding wall is divided into two is formed with a notch that substantially matches the outer shape of the soot tube. Depending on the thickness of the above-mentioned elastic body, it is preferable that each of them is formed in a semicircular cutout portion having a diameter of the outer tube plus about 20 mm. And the below-mentioned division | segmentation frame body is each attached to those semicircular notch parts, On the other hand, the division | segmentation edge parts (namely, the linear part of the both sides of a notch part) of division wall parts mutually connect the below-mentioned joining piece. Preferably, they are joined together via an elastic piece, which will be described later, to form one water-impervious wall.
[0016]
Then, by forming a single impermeable wall in this way, the elastic body wound around the outer peripheral surface of the soot tube on the cutout portion of the pair of split wall portions and the split frame bodies respectively mounted on the cutout portions The force which presses is generated, and the impermeable wall is attached to the outer periphery of the soot pipe. In addition, as described above, by constructing the impermeable wall with a pair of dividing walls, it is necessary to insert a fistula into the through-hole of the impermeable wall, which was necessary at the time of construction of the conventional example, and is extremely large. Therefore, it is possible to eliminate work that requires a lot of labor.
[0017]
It should be noted that, in the water channel prevention pipe structure according to the present invention, the dividing direction of the impermeable wall is preferably the vertical direction, but is not necessarily limited to the vertical direction, and is not necessarily limited to the vertical direction. That is, it may be divided in any direction such as an oblique direction. Further, the number of divisions is preferably two, but may be larger.
[0018]
Moreover, it is preferable that the material of a pair of division | segmentation wall part is a hard thermoplastic resin, specifically, high-density polyethylene, The thickness is 20 mm-40 mm although it is determined by the concrete situation of a construction site. It is preferable. This is because the pair of partition walls constituting the water-impervious wall of the water groove prevention pipe structure according to the present invention requires two physical properties, moderate rigidity and moderate elasticity. And, since the dividing wall part has appropriate rigidity and appropriate elasticity, it is possible to make the dividing wall part self-supporting at a desired position during construction of the water channel prevention pipe structure, thereby facilitating the construction. In addition, by pressing the pair of dividing wall parts against the soot tube via the elastic body, it is possible to prevent the soot tube from being damaged even if an excessive force is applied to the attachment portion with the soot tube. It becomes.
[0019]
In addition, by using a hard thermoplastic resin, the material cost can be reduced and the weight can be reduced with respect to conventional steel or rubber impermeable walls. In particular, weight reduction is preferable in terms of simplifying transportation, improving workability and safety during construction, and preventing ground subsidence after construction. In particular, since the conventional rubber impermeable walls are rolled and carried during transportation, they have a curl, which was a major factor that deteriorated workability during construction. As described above, the pair of dividing wall portions are made of a hard thermoplastic resin so as to be able to stand on their own, so that the workability is not deteriorated.
[0020]
Next, the divided frame will be described. In the present invention, the divided frame body is preferably made of metal. The shape is required to be a shape corresponding to the outer shape of the tubule, but is preferably a shape that can be divided into a plurality of portions, that is, a shape corresponding to the cutout portion of the divided wall portion, and an annular shape. It is more preferable that the frame body is a semicircular shape obtained by dividing the frame body into two vertically. The cross section is preferably L-shaped. And one surface of this L-shaped cross section is respectively attached so that the notch part may be surrounded on the periphery of the notch part of a pair of division wall part. More preferably, the divided frame bodies are provided on the front and back peripheral edges of the cutout portions of the pair of divided wall portions, that is, on both sides. By providing on both sides in this way, it becomes possible to press the elastic body wound around the outer peripheral surface of the soot tube from the two directions of the front and back of the split wall portion, and the pair of split wall portions are firmly against the soot tube It can be fixed.
[0021]
Next, the joining piece will be described. This joining piece is provided for joining the split side portions of the pair of split wall portions described above, and the material thereof is preferably metal like the split frame body, and the cross section is L-shaped. Preferably there is. In addition, when joining the dividing wall portions using this joining piece, it is possible to join by sandwiching a plate-like elastic piece so as to seal the joining surface of the divided side portions and the joining surface of the joining pieces. It is preferable to improve the effect of preventing the formation of the water imperfection of the assembled impermeable wall, and the material of the elastic piece is preferably the same as the elastic body that seals between the above-described soot tube and the divided frame body.
[0022]
In addition, in the water channel formation preventing dredging structure according to the present invention, the divided side portions of the divided wall portions are joined by welding at a construction site without using the above-mentioned joining pieces and elastic bodies. Also good. Moreover, since the concrete construction procedure is demonstrated in detail by the term of the below-mentioned embodiment, the description is abbreviate | omitted here.
[0023]
As described above in detail, the basic structure of the water groove formation preventing dredge structure according to the present invention is a simple structure, and the conventional water groove formation preventing dredge structure (water groove preventing structure around the dredging pipe). However, it should be noted that the impermeable wall is made up of a pair of dividing walls. Further, in the point that the divided frame body has a shape corresponding to the divided wall portions, the workability at the time of construction is very good, and the construction period can be greatly shortened.
[0024]
Hereinafter, a specific configuration and construction procedure of a water channel formation preventing dredger structure according to the present invention will be described based on an embodiment shown in the drawings. However, this does not limit the present invention.
FIG. 1 is an explanatory diagram of the peripheral structure of an embodiment of a water channel formation preventing dredger structure according to the present invention. FIG. 2 is a front view of a part of the embodiment of FIG. FIG. 3 is a right side view of the vicinity of the impermeable wall mounting portion of the embodiment of FIG. FIG. 4 is a left side view of the vicinity of the impermeable wall mounting portion of the embodiment of FIG. FIG. 5 is a plan view of the vicinity of the impermeable wall mounting portion of the embodiment of FIG. 6 is a cross-sectional view taken along line AA in FIG. 7 is a cross-sectional view taken along line BB in FIG. FIG. 8 is a schematic construction diagram showing a procedure for attaching the dividing wall portion to the steel pipe.
FIG. 9 is a view corresponding to FIG. 2 and showing the whole embodiment of the water groove formation preventing pipe structure according to the present invention. 10 is an enlarged cross-sectional view taken along the line CC of FIG.
[0025]
First, in FIG. 1, the water channel formation preventing dredging structure 1 which is an embodiment of the water channel formation preventing structure according to the present invention is to guide the water of the river 2 to other places (not shown) as agricultural water. A water-impervious structure composed of a dredger pipe 6 embedded in the levee 3 and divided wall portions 14 and 15 for preventing formation of a water channel (water drainage path) 5 that may occur in the vicinity of the dredger pipe 6. A wall 7, an elastic resin frame 42 (see FIGS. 9 and 10) as a first elastic body, which will be described later, and a steel frame 45, which will be described later, extended from the impermeable wall 7 through this frame (see FIG. 9 and FIG. 10). In addition, 4 is Xiamen and 46 is a sheet pile.
[0026]
Therefore, first, with reference to FIGS. 2 to 7, the details of the structure for attaching the dividing wall portions (sometimes referred to as divided impermeable wall portions) 14 and 15 to the soot pipe 6, that is, the water channel formation preventing soot pipe structure 1 will be described. I will explain.
[0027]
As shown in FIGS. 2 to 7, particularly FIG. 2, a belt-like elastic body (second elastic body) made of chloroprene rubber as a second elastic body is formed on the outer peripheral surface 8 of the soot tube 6 made of high-density polyethylene. The body) 9 is arranged so as to surround the outer peripheral surface 8 of the soot tube 6. In addition, this chloroprene rubber can also be used as a water expansion rubber. If this water expansion rubber is used as the material of the elastic body 9, it will swell with moisture after the installation of the soot tube 6 and the dividing wall portions 14 and 15, thereby This is more preferable in terms of sealing properties.
The dividing wall portions 14 and 15 have semicircular steel divided frames 10a, 10b, 11a and 11b having L-shaped cross sections on the front and back peripheral edges of the semicircular cutout portions 16 respectively, and bolts 12 and nuts 13 respectively. Is fixed through.
[0028]
Further, joining pieces 18a, 18b, 18c, 18d, 18e, 18f, 18g and 18h having L-shaped cross sections are fixed to the front and back of the divided side portions 17 of the divided wall portions 14 and 15 using bolts 12 and nuts 13, respectively. Furthermore, the joining pieces 18a and 18b, 18c and 18d, 18e and 18f, 18g and 18h are bolts 12 and nuts 13 via plate-like elastic pieces 19 and 20 that seal between the divided wall portions 14 and 15. Are used to form a single impermeable wall 7. Then, the split side portions 17 are joined in this way to form one water-impervious wall 7, so that the remaining one side of the split frame bodies 10 a, 10 b, 11 a and 11 b and the cutouts of the split wall portions 14, 15 are formed. The portion 16 presses the elastic body 9 to fix the water shielding wall 7 to the outer periphery of the soot tube 6 and enhances the sealing effect between the outer peripheral surface 8 of the soot tube 6 and the water shielding wall 7.
[0029]
Next, the actual construction procedure of the water groove formation preventing structure according to the present invention will be described with reference to FIG.
For the actual construction of the water channel formation preventing dredging structure 1 of this embodiment, first, the dividing wall portion 15 is installed at a desired position. At this time, it is preferable that the divided frame bodies 10b and 11b are attached in advance to the cutout portion 16 of the dividing wall portion 15 and the joining pieces 18b, 18d, 18f, and 18h are attached to the divided side portion 17. Next, the soot tube 6 around which the elastic body (second elastic body) 9 is wound is placed on the notched portion 16 of the dividing wall portion 15, and then on the dividing side portion 17 of the dividing wall portion 15. Place the elastic pieces 19 and 20, and place the dividing wall portion 14 on which the attachment frames 10 a and 11 a and the joining pieces 18 a, 18 c, 18 e and 18 g are attached in advance on the tub tube 6 in the same manner as the dividing wall portion 15 described above. By using bolts 12 and nuts 13, further joining pieces, that is, joining pieces 18 a and 18 b, 18 c and 18 d, 18 e and 18 f, and 18 g and 18 h are fixed through elastic pieces 19 and 20, respectively, and a water groove formation prevention pipe Construction of structure 1 is completed. Reference numeral 44 denotes a steel outer frame, which has a U-shaped cross-sectional edge 45 along both sides and the bottom thereof. 46 is a sheet pile.
[0030]
As described above, since the water channel formation preventing dredged pipe structure 1 is composed of the divided wall portions 14 and 15 in which the water blocking wall 7 is divided into upper and lower portions, This eliminates the need for a large-scale work of inserting a soot tube into the through-hole portion of the impermeable wall, which is necessary for the construction, and greatly shortens the construction period (for example, shortens to 1/4 to 1/5). It is possible.
[0031]
9 and 10, reference numeral 41 denotes the overall configuration of the embodiment of the water channel formation preventing dredging structure according to the present invention, which has been described as the water channel formation preventing dredging structure 1. In addition to the connecting structure of the wall 7 with the dividing wall portions 14 and 15, that is, in addition to the connecting structure of the split pipe portion 6 and the dividing wall portions 54 and 55 of the impermeable wall 47, a plate-like shape as the first elastic body An elastic resin frame 42 and a steel outer frame 44 extending to the dividing wall portions 54 and 55 through the frame are mainly provided.
[0032]
This water channel formation prevention pipe structure 41 is suitable for installation in a place where ground subsidence can be easily predicted after construction, and an elastic resin frame is provided on the outer peripheral portion of the inner frame 43 of the water shielding wall 47. 42 is fixed by a bolt 12 and a nut 13. A steel outer frame 44 is fixed to the outer peripheral portion of the elastic resin frame 42 with bolts 12 and nuts 13.
The steel frame 44 has a U-shaped cross-sectional edge portion 45 on both sides and a bottom side thereof, that is, a U-shaped cross section that opens in the outer peripheral direction. At the site by inserting the side part of the sheet pile 46 inserted into the ground, both upper end openings (not shown) between the cross-sectional U-shaped edge part 45 of the impermeable wall 47 and the corresponding side of the sheet pile 46, The sheet pile 46 is fixed by pouring the concrete 50 through the small hole 49 (see FIG. 8) of the edge portion 45 having a U-shaped cross section. Therefore, unlike the case of using bolts and nuts, the fixing method using the concrete 50 of the sheet pile 46 can tolerate a variation in the dimensions of the objects to be fixed within a considerable range, so that workability can be greatly improved. .
[0033]
In this embodiment, the water channel formation preventing dredged pipe structure 41 is provided with an elastic resin frame 42 on the outer peripheral portion of the inner frame 43 of the water shielding wall 47, thereby making use of the elasticity of the elastic resin frame 42 in the ground. This further improves the ability to follow the sinking of the sea.
[0034]
【The invention's effect】
According to the present invention, there are U-shaped side edges along both sides and the bottom of the substantially square impermeable wall, and when the impermeable wall is connected to the sheet pile, the U-shaped cross-section side of the impermeable wall. Insert the corresponding side of the sheet pile into the edge, and then inject the ready-mixed concrete between the U-shaped side edge of the cross section and the corresponding side of the inserted sheet pile to harden and integrate the bolts and nuts. Unlike the case where it is used, the dimensional variation between the objects to be fixed can be allowed in a wide range, so that the workability can be greatly improved.
Furthermore, when the water shielding wall is constituted by a pair of divided wall portions, it is possible to eliminate the operation of inserting the soot pipe through the through hole portion of the water shielding wall, which is necessary in the conventional water groove formation prevention method.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram of the peripheral structure of an embodiment of a water channel formation preventing soot tube structure according to the present invention.
FIG. 2 is an enlarged front view of the vicinity of a water shielding wall mounting portion of the embodiment of FIG.
3 is an enlarged right side view of the vicinity of a water shielding wall mounting portion of the embodiment of FIG. 1;
4 is an enlarged left side view of the vicinity of the impermeable wall mounting portion of the embodiment of FIG.
FIG. 5 is an enlarged plan view of the vicinity of a water shielding wall mounting portion of the embodiment of FIG. 1;
6 is a cross-sectional view taken along line AA in FIG.
7 is a cross-sectional view taken along line BB in FIG.
FIG. 8 is a schematic construction diagram showing a procedure for attaching a dividing wall portion to a steel pipe.
FIG. 9 is a view corresponding to FIG. 2 showing an embodiment of the water channel formation preventing soot tube structure according to the present invention.
10 is an enlarged sectional view taken along line CC in FIG.
[Explanation of symbols]
1 ... Water pipe formation prevention soot tube structure
2 ... River
3 ...
4 ... Xiamen
5 ... water path
6 ...
7 ... Impermeable wall
8 ... Outer peripheral surface
9: Elastic body (second elastic body)
10, 11 ... division frame
12 ... Bolt
13 ... Nut
14, 15 ... division wall part
16 ... notch
17 ... division side part
18 ... Joint piece
19, 20 ... elastic pieces
41 ... Water pipe formation prevention pipe structure
42 ... Elastic resin frame (first elastic body)
43 ... Inner plate
44 ... Steel outer frame
45 ... U-shaped cross-section edge
46 ... sheet pile
47 ... Impermeable wall
49 ... Small hole
50 ... concrete
54, 55 ... dividing wall part

Claims

When burying dredging pipes in the ground, burying the impervious walls and sheet piles with through holes through the penetrating pipes through the through holes of the impermeable walls and connecting the impermeable walls to the sheet piles, respectively. In the method for preventing the formation of a water channel around the soot tube,
The impermeable wall is substantially square and has a U-shaped cross-sectional edge with a U-shaped cross section along its both sides and bottom and the U-shaped opening facing outward. ,
When connecting the impermeable wall to the sheet pile, insert the corresponding side of the sheet pile into the U-shaped edge of the cross section of the impermeable wall, and then between the U-shaped edge of the inserted sheet pile and the corresponding edge of the inserted sheet pile A method for preventing the formation of a water pipe in a pipe, characterized by injecting ready-mixed concrete and curing it.

A water-impervious wall has a pair of upper and lower divided wall portions each having a notch having a shape corresponding to the outer shape of the vertical pipe, and an upper and lower side mounted on each divided wall portion for fixing the respective divided wall portions to the vertical pipe. It consists of a pair of divided frames,
When burying a dredging pipe and a water-impervious wall having a through-hole into the ground through the dredged pipe in the through-hole of this impermeable wall,
After burying the lower dividing wall part of the impermeable wall in the ground, place the soot pipe on the notch part of the lower dividing wall part, then the upper dividing wall part on the lower dividing wall part, and the notch part becomes the soot pipe The method according to claim 1, wherein the pair of upper and lower divided wall portions are joined by a pair of upper and lower divided frame bodies.

The substantially square water-impervious wall having a through-hole includes an inner frame, a first elastic body, and an outer frame extending outward from both sides and the bottom of the inner frame via the first elastic body,
The method for preventing water from being formed in a raft pipe according to claim 1, wherein the U-shaped side edges of the water shielding wall are formed along both sides and a bottom side of the outer frame.

A water-impervious wall has a pair of upper and lower divided wall portions having a cutout portion having a shape corresponding to the outer shape of the vertical pipe, and upper and lower portions attached to the divided wall portions to fix the divided wall portions to the vertical pipe. It consists of a pair of split frame parts,
When embedding the dredging pipe and the impermeable wall in the ground through the dredging pipe through the through hole of the impermeable wall, the first elastic body is connected to the inner frame, the outer frame and the first elastic body of the lower dividing wall portion. After burying in the ground so as to be interposed between the both sides and bottom of the inner frame and the inside of the outer frame, and then placing the soot tube on the cutout part of the lower dividing wall part, The frame and the first elastic body are placed on the lower dividing wall portion so that the cutout portion of the inner frame covers the soot tube, and the first elastic body is interposed between both sides of the inner frame and the outer frame, The method for preventing the formation of a water pipe in a vertical pipe according to claim 3, wherein the pair of upper and lower divided wall portions are joined by a pair of upper and lower divided frame portions.

5. When the soot pipe is passed through the through hole of the impermeable wall, the second elastic body is interposed between the soot pipe and the through hole of the impermeable wall. A method for preventing water from forming.

The second elastic body has a belt-like shape,
When the second elastic body is interposed between the soot pipe and the through hole of the impermeable wall, the second elastic body is pre-wound around the soot pipe, and then the soot pipe is passed through the wound second elastic body. 6. The method for preventing water from forming a drainage pipe of the pipe according to claim 5, wherein the water passage is made to pass through the through hole of the impermeable wall.

The U-shaped cross-sectional edge along the bottom of the impermeable wall has a small hole in its horizontal part, and the gap between the cross-sectional U-shaped edge of the impermeable wall and the corresponding side of the inserted sheet pile The ready-mixed concrete is injected through both upper end openings and small holes between the U-shaped cross-sectional edge of the water-impervious wall and the corresponding side of the inserted sheet pile. 4. A method for preventing the formation of water ducts in the pipe as described in 1.

Pass the water pipe and sheet pile with a through hole, through the through hole of the water barrier wall, and connect the water barrier wall to the sheet pile and embed it in the ground, respectively. In the water pipe formation prevention structure of the soot pipe that prevents it from being formed,
The impermeable wall is substantially square, and the connecting part that connects this impermeable wall and the sheet pile is
A cross-sectional U-shaped side edge formed along both sides and bottom of the impermeable wall, having a U-shaped cross section, and the U-shaped opening portion facing outward,
The corresponding edge of the sheet pile inserted into this U-shaped cross-section edge,
A structure for preventing the formation of a waterway in a vertical pipe comprising a concrete body injected and hardened between a U-shaped cross-sectional edge portion of a water shielding wall and a corresponding edge portion of an inserted sheet pile.