JP4021108B2

JP4021108B2 - Packing for propulsion tube

Info

Publication number: JP4021108B2
Application number: JP25511199A
Authority: JP
Inventors: 洋和田; 治津坂
Original assignee: Okumura Corp
Current assignee: Okumura Corp
Priority date: 1999-09-09
Filing date: 1999-09-09
Publication date: 2007-12-12
Anticipated expiration: 2019-09-09
Also published as: JP2001073679A

Description

【０００１】
【発明の属する技術分野】
本発明は推進工法によって地中に管体を埋設する際に、管体間に介在させるパッキンの改良に関するものである。
【０００２】
【従来の技術】
推進工法によって地中に電線布設管やガス、水道管などの埋設管を敷設する場合、まず、発進立坑側からシールド機を掘進させ、該シールド機に仮管を順次継ぎ足しながら後続させて該仮管列の後端を発進立坑内に配設した推進装置により押し進めながら到達立坑まで推進埋設し、しかるのち、仮管と埋設管とを置換することが行われている。そして、仮管を推進、埋設する時における推進方向の測量や掘削土砂の排除を行うために、仮管Ａには図４，図５に示すようにその前後端面板20、21の中央に測量孔22、22を設けていると共に内部に送排泥管路23、24や滑材供給管路25、送水管路26などが互いに平行に配設してこれらの管路23〜26の前後両端開口部を上記前後端面板20、21を貫通して外部に開口させている。
【０００３】
従って、このような仮管同士を接続する際には開口端間を止水状態に連通させる必要があり、このため、本願出願人等が特開平７ー１５８７４３号公報に記載しているようなパッキンを開発した。このパッキンは図11、図12に示すように、円形状剛性板41の外周縁に外径が仮管Ａの外径に略等しいリング状フランジ部41a を前後方向に向けて突設すると共に、仮管Ａ内に設けている上記測量孔22と管路23〜26の開口端にそれぞれ対応して上記剛性板41の部分に通孔42〜46を穿設し、これらの通孔42〜46に前後方向の突出長さが上記リング状フランジ部41a の前後方向の突出長さより大きい寸法を有し且つ中央部に上記管路23〜26と略同径の連通孔を穿設してなる短筒形状の弾性パッキン部材52〜56を装着してなる構造を有している。
【０００４】
【発明が解決しようとする課題】
しかしながら、推進装置によって仮管Ａを推進させる場合、その推進力によって上記パッキンの弾性パッキン部材52〜56を圧縮させ、リング状フランジ部41aの前後端面を隣接する仮管Ａの対向端面に当接させることによって順次前方側の仮管Ａに伝達するように構成しているため、仮管Ａを計画曲線に沿って施工する時にはその屈曲方向側のリング状フランジ部41a と仮管Ａとの対向部が当接し、この当接部を支点として凸円弧状に湾曲する外側に向かってリング状フランジ部41a と仮管Ａとの対向面が徐々に拡がることになり、従って、当接部から最も離れた位置に設けられている弾性パッキン部材に対する上記管路端面との圧接力が著しく小さくなり、計画曲線の屈曲度が大きくなると離間する場合も生じて止水作用を奏することができなくなる虞れがあり、曲線施工に適さないという問題点があった。
【０００５】
また、リング状フランジ部41a を介して管体Ａに推進力を伝達することなく、弾性パッキン部材52〜56を介して推進力の伝達を行うように構成した場合には、仮管Ａの測量孔22及び各管路23〜26に対応して設けられたこれらの弾性パッキン部材52〜56の配置状態が、上下方向及び左右方向に対称的に設けられていないので、これらの弾性パッキン部材52〜56を介して前側の管体Ａに伝達される推進力は該管体Ａに対して均等に作用しなく、推進装置による推進力を管体Ａの面に均等に作用させても管体Ａが上下左右方向に偏って正確な推進ができなくなるという問題点があった。
【０００６】
なお、推進装置による推進力が大きい場合には、この推進装置に近い管体Ａ側においては弾性パッキン部材52〜56がその弾性範囲を越えて大きく圧縮して上記リング状フランジ部41a が管体Ａの端面に当接し、このフランジ部41a を介して管体Ａに均一な推進力が伝達されるが、この場合においても、シールド機側の管体Ａに伝達される推進力が小さくなり、上記問題点が生じることになる。
【０００７】
本発明はこのような問題点に鑑みてなされたもので、その目的とするところは、仮管のような推進管体に対する推進力の伝達が全面的に均一に行えるようにすると共に曲線施工時においても止水機能を損することなく正確な施工を可能にし得る推進管体用パッキンを提供するにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するために本発明の推進管体用パッキンは、請求項１に記載したように、推進管体の対向端面間に介在させる円板形状のパッキン主体に、推進管体内に設けている複数の管路の開口端にそれぞれ対応して通孔を穿設し、これらの通孔の外周縁にリング状のパッキン部材を一体に設けてなる推進管体用パッキンであって、このパッキンに作用する圧力分布がパッキン主体の中心を通る水平、垂直線に対して上下、左右対称となるように、パッキン主体の所定部分にダミーパッキン部材を取付けてなること構造としている。
【０００９】
上記請求項１に記載の推進管体用パッキンにおいて、請求項２に係る発明は、パッキン主体はゴム製であってその前面を平坦な面に形成している一方、後面にリング状パッキン部材とダミーパッキン部材とを後方に向かって同一突出高さでもって突設してあり、さらに、これらのリング状パッキン部材とダミーパッキン部材とを除くパッキン主体の後面にリング状パッキン部材とダミーパッキン部材との突出高さと同一厚みを有する低反発性弾性被覆層を層着していることを特徴としている。
【００１０】
【作用】
管体の推進埋設時において先行する管体の後端面と後続する管体の前端面との間に上記パッキンを介在させ、このパッキンの複数個所に設けているリング状弾性パッキン部材をそれぞれ対向する上記前後管体内の管路の開口端外周縁間に介在させた状態にすると共にダミーパッキン部材を前後管体の対向端面で挟着させた状態にしたのち、両管体間を適宜長さのボルトにより連結する。この場合、ボルトは締切らないで、管体同士が互いに屈折できるだけの寸法をあけておく。このように両管体を接続して地中に推進させると、後続管体側からの推進力によって弾性パッキン部材及びダミーパッキン部材が圧縮され、これらの弾性パッキン部材とダミーパッキンを介して後続管体の推進力が先行する管体に伝達されて推進埋設される。
【００１１】
この時、管体内に配設されている複数の管路は、管体の中心を通る水平、垂直線に対して上下左右に非対称的な配置状態であって、且つその径も異なっているので、これらの管路に対応してパッキン主体に設けられている上記弾性パッキン部材を介して先行側管体の後端面を押圧する推進力は、該先行管体の後端面の上半部側と下半部側、及び左側部分と右側部分とで異なった圧力分布状態となって伝達されることになるが、本発明のパッキンにおいては、ダミーパッキン部材を装着して、このダミーパッキン部材と上記全ての弾性パッキン部材との圧縮力によりパッキン主体を介して先行側管体の後端面に伝達される押圧力の圧力分布が該パッキン主体の中心を通る水平、垂直線に対して上下左右方向に対称となるように構成しているので、推進力が管体の全面に亘って均一に作用し、管体を上下左右に偏らせることなく正確な推進が可能となる。
【００１２】
さらに、管体の曲線施工時においても、曲げ方向側、即ち、計画曲線の内側に装着されている弾性パッキン部材は均等に且つ直線施工時における圧縮状態よりも大きく圧縮し、反対側、即ち、凸円弧状に湾曲する計画曲線の外側に装着されている弾性パッキン部材は直線施工時における圧縮状態から均等な復元力でもって管体の端面に押接し、所定方向に正確に曲線施工を行うことができる。
【００１３】
また、請求項２に係る発明によれば、パッキン主体はゴム製であってその前面を平坦な面に形成しているので、先行側の管体の後端面に馴染性よく密着すると共にこのパッキン主体の後面における上記リング状パッキン部材とダミーパッキン部材とを除く部分にリング状パッキン部材とダミーパッキン部材との突出高さと同一厚みを有する低反発性弾性被覆層を層着しているので、この低反発性弾性被覆層が直線施工、曲線施工にかかわらず常に管体の対向面に密接して土砂等の流入を防止することができる。
【００１４】
【発明の実施の形態】
次に、本発明の実施の形態を図面について説明すると、図１〜図３において、１は外径を仮管からなる管体Ａの外径に略等しく形成している一定厚みを有する円板形状のゴム製パッキン主体で、管体Ａ内に設けている後述する複数の管路の開口端に対応した部分にそれぞれ通孔２〜６を前後面間に貫通して設けてあり、さらに、このパッキン主体１の前面は全面的に平坦面に形成されている一方、後面側においては、上記各通孔２〜６の開口端外周縁に後方に向かって一定の突出高さでもってリング状のパッキン部材12〜16を突設していると共にこれらのパッキン部材12〜16以外のパッキン主体１の所定部分にリング状パッキン部材12〜16と同一突出高さでもって短円柱形状のダミーパッキン部材７を突設している。また、このパッキン主体１の外周部の複数個所に、周方向に一定間隔毎にボルト挿通孔９を穿設している。なお、ダミーパッキン部材７とリング状パッキン部材12〜16とはパッキン主体１と同一のゴム材によってパッキン主体１と一体に成形されているものである。
【００１５】
さらに、上記パッキン主体１の後面には、ダミーパッキン部材７とリング状パッキン部材12〜16とを除くパッキン主体１の後面全面にこれらのダミーパッキン部材７とリング状パッキン部材12〜16との突出高さと同一厚みを有する低反発性弾性被覆層８を層着している。この低反発性弾性被覆層８は図２に示すように、パッキン主体１と同一径で且つリング状パッキン部材12〜16やダミーパッキン部材７の突出高さと同一厚みを有する円板形状のスポンジ又は発泡合成樹脂等の低反発性弾性材料からなり、この低発泡性の弾性円板状体8'における上記パッキン主体１に突設したダミーパッキン部材７とリング状パッキン部材12〜16との対向部分に、これらのダミーパッキン部材７とリング状パッキン部材12〜16とを挿嵌させる嵌合孔82〜87を前後面間に貫通して設けていると共にパッキン主体１に外周部に設けている上記ボルト挿通孔９に対向してこのボルト挿通孔９よりも小径のボルト挿通孔10を穿設している。
【００１６】
この円板状体8'をパッキン主体１の後面に重ね合わせて対向端面を密着させ、その嵌合孔82〜87にパッキン主体１に突設した対応するリング状パッキン部材12〜16とダミーパッキン部材７をそれぞれ挿嵌させると共にボルト挿通孔９、10同士を合致させたパッキンＰを構成しているものである。
【００１７】
上記管体Ａは図４、図５に示すように、その前後端面板20、21の中央部に円形の測量用孔22を貫通状態で穿設していると共に、前後端面板20、21の両側下部に該管体Ａ内に並設した送排泥管路23、24の前後開口端を外部に連通させている円形の開口孔23a 、24a をそれぞれ設けてあり、さらに、前後端面板20、21の上下部には管体Ｐ内に配設した滑材供給管や送水管等の管路25、26の開口端を同じく外部に連通させている円形の開口孔25a 、26a を設けてある。また、前後端面板20、21の外周部数個所に上記パッキン主体１に設けているボルト挿通孔９よりも小径のボルト締結用孔28を設けてある。なお、29は管体Ｐの上周部に全長に亘って凹設した油圧供給ホースや配線類の収納溝である。
【００１８】
そして、上記パッキン主体１の中央部に設けている通孔２は管体Ａの上記測量用孔22と同一径に形成されていてこの測量用孔22に連通させ、パッキン主体１の両側下部に設けている通孔３、４は管体Ａの上記送排泥管路23、24の開口孔23a、24a と同一径に形成されていてこれらの開口孔23a 、24a にそれぞれ連通させるものであり、さらに、パッキン主体１の左上部と下部とに設けている通孔５、６は管体Ａの上記滑材供給管や送水管等の管路25、26の開口孔25a 、26a と同一径に形成されていてこれらの開口孔25a 、26a に連通させるように構成している。また、管体Ａの外周部に設けているボルト締結用孔28に上記パッキンＰの外周部に設けているボルト挿通孔９、10を合致させるように構成している。なお、パッキンＰの上端部には管体Ａの上記収納溝29と同一断面形状を有してこの収納溝29に連通する切欠凹所11を設けている。
【００１９】
パッキンＰの後端面に突設している上記ダミーパッキン部材７の取付位置は、このダミーパッキン部材７と上記全てのパッキン部材12〜16とがパッキンＰの面に直交する方向からの圧力によって圧縮した時に、その圧縮力によってパッキン主体１全面に作用する圧力分布が、このパッキン主体１の中心を通る水平、垂直線に対して上下、左右対称となる位置に設けられている。このように、パッキンに作用する圧力分布がパッキン主体１の中心を通る水平、垂直線に対して上下、左右対称となるようにダミーパッキン部材７の位置を設定するには、上記パッキン部材12〜16の位置やパッキン主体１の径等によって制限されるが、ダミーパッキン部材７の大きさ（体積）を変更することによって好ましい位置に設けておくことができる。
【００２０】
次に、このように構成した推進管体用パッキンＰの使用態様を述べると、図８に示すように、発進立坑31からシールド機32を到達立坑（図示せず）側に向かって発進させ、このシールド機32に後続して仮管としての管体Ａを順次継ぎ足しながら発進立坑31内に設置した推進装置33により押し進めて地中に推進、埋設していく。この際、発進立坑31内において、地中に押し進めた管体Ａの後端に次に埋設すべき管体Ａを接続させる時に、両管体Ａ、Ａの前後対向面間に図６に示すようにパッキンＰを挟持状態に介在させるものである。
【００２１】
パッキンＰの装着は、このパッキンＰの平坦な前面を前側の管体Ａの後部端面板21の後面に密接させてその通孔２〜６を該後部端面板21に開設している測量用孔22、開口孔23a 〜26a にそれぞれ連通させると共に後面に突設している上記パッキン部材12〜16を後側管体Ａの前部端面板20に開口している測量用孔22、開口孔23a 〜26a の開口端外周面に密接させ、且つダミーパッキン部材７をこの前部端面板20の対向面に密接させた状態にしたのち、両管体Ａ、Ａの外周部複数個所で対向するボルト締結用孔28、28間にパッキンＰの外周部に設けているボルト挿通孔９、10を通じてボルト34を挿通し、ナット35を螺合させることによって連結する。この際、ボルト34の長さ、即ち、両管体Ａ、Ａの対向する前後端面板20、21間の間隔を管体同士の最大屈曲時の長さとなるように調整しておく。なお、ボルト34を挿通する際に、パッキンＰの前後面にボルト挿通孔９、10に合わせて図７に示すように円環状の金属製スペーサ27、27を配設し、この金属製スペーサ27、27を介してボルト34とナット35により前後管体Ａ、Ａの対向端面板20、21を連結する。この際、一方の金属製スペーサ27はパッキン主体１のボルト挿通孔９内に嵌め込み、他方の金属製スペーサ27は低反発性弾性被覆層８側のボルト挿通孔10の外面に圧接させてこれらの金属製スペーサ27、27間で低反発性弾性被覆層８を挟着させている。
【００２２】
このように管体同士を接続しながら到達立坑側に向かって順次地中に推進、埋設していくものであるが、推進装置33によって後続管体を押し進めると、該後続管体からの押圧力がパッキンＰに対して直交する方向に作用し、パッキンＰのパッキン主体１の後面に突設している弾性パッキン部材12〜16とダミーパッキン部材７、及び後面に層着している低反発性弾性被覆層８とが圧縮されてその圧縮した時の弾発力を介して先行側の管体Ｐに上記推進装置33の推進力が伝達される。
【００２３】
この際、パッキンＰに作用する圧力分布がパッキン主体１の中心を通る水平、垂直線に対して上下、左右対称となるように構成しているので、後続管体Ａからの推進力は、このパッキンＰを介して先行管体Ａ側に全面的に均等に伝達するものである。
【００２４】
即ち、図３においては、パッキン主体１の後面下半部側には、通孔２の外周縁から突設している弾性パッキン部材12の下半部と送排泥管路23、24に連通する通孔３、４の外周縁から突設している弾性パッキン部材13、14と送水管26に連通する通孔６の外周縁から突設している弾性パッキン部材16があり、パッキン主体１の後面上半部側には通孔２の外周縁から突設している弾性パッキン部材12の上半部と滑材供給管25に連通する通孔５の外周縁から突設している弾性パッキン部材15と上記ダミーパッキン部材７が突設していて、パッキンＰの面に垂直な圧力が作用した時に、上記下半部側にある弾性パッキン部材12、13、14、16の圧縮によりパッキンＰの下半部全体に作用する圧力と、上記上半部にある弾性パッキン部材12、15とダミーパッキン部材７の圧縮によるパッキンＰの上半部全体に作用する圧力とが等しくなるようにパッキンＰを構成してあり、、同様に、パッキンＰの左側半部にある弾性パッキン部材の圧縮によるパッキンＰの左側半部全体に作用する圧力と、右側半部にある弾性パッキン部材及びダミーパッキン部材７の圧縮によるパッキンＰの右側半部全体に作用する圧力とが等しくなるように構成しているので、後続管体Ａの推進力をこのパッキンＰを介して先行管体Ａに上下左右均等に伝達することができ、先行管体Ａが偏ることなく正確に推進するものである。
【００２５】
さらに、管体Ａの推進埋設中において、前後管体Ａ、Ａを互いに計画曲線に沿って上下、左右方向に屈折させると、曲げ方向側、例えば、右方向に屈折させた場合、パッキンＰの中心を通る垂直線から右方向に等しい位置に装着されている複数の弾性パッキン部材が均等に且つ直線施工時における圧縮状態よりも大きく圧縮し、反対側、即ち、左側に装着されている複数の弾性パッキン部材が上記垂直線から左方向に等しい位置における部分において直線施工時における圧縮状態から均等な復元力でもって管体の端面に押接して止水状態を維持し、従って、右方向に正確に曲線施工を行うことができるものであり、左方向又は上下方向に対しても同様である。また、管体Ａが直線施工時、曲線施工時においても低反発性弾性被覆層８によって前後管体Ａ、Ａ間に土砂が浸入するのを防止する。
【００２６】
こうして、一連に連通した管体Ａ内の送排泥管22、23を通じてシールド機32によって掘削された土砂を発進立坑31側に排出しながら推進し、到達立坑まで管体列が達すると、次に、発進立坑31側からガス管や水道管等の埋設管を順次、継ぎ足しながら推進、埋設させ、仮管として先に埋設した管体Ｐと置換するものである。
【００２７】
なお、上記管体推進工法においては、送排泥管路23、24に要求される耐水圧は低く、滑材供給管路25に要求される耐水圧が比較的大きいので、送排泥管路23、24に対応してパッキンＰに設けている上記弾性パッキン部材13、14としては、管路の開口端に圧着させる先端部の形状を、図９に示すように内外周面間の中央部を端面から一定深さだけ全周に亘って刻設することにより周溝13a 、14a を形成して容易に圧縮し得る形状とし、滑材供給管路25に対応してパッキンＰに設けている弾性パッキン部材15としては、管路の開口端に圧着させる先端部の形状を図10に示すように平坦な面に形成して止水性能を向上させておくことが望ましい。
【００２８】
【発明の効果】
以上のように本発明の推進管体用パッキンによれば、推進管板の外径に等しい外径を有する円板形状のパッキン主体に、推進管体内に設けている複数の管路の開口端にそれぞれ対応して通孔を穿設し、これらの通孔の外周縁にリング状のパッキン部材を一体に設けてなる推進管体用パッキンであって、このパッキンに作用する圧力分布がパッキン主体の中心を通る水平、垂直線に対して上下、左右対称となるように、パッキン主体の所定部分にダミーパッキン部材を取付けているので、このパッキンを推進管体間に介在させることによって弾性パッキン部材が管体の管路の対向開口端の外周縁に密着して常に確実な止水効果を奏することは勿論、上記ダミーパッキン部材と上記弾性パッキン部材との圧縮時における弾発力がパッキン主体の中心を通る水平、垂直線に対してパッキンに上下、左右対称な圧力分布となるように構成しているので、管体を直線施工時においても曲線施工時においても上下左右方向に偏らせることなく正確な方向に推進させることができる。
【００２９】
また、請求項２に係る発明によれば、パッキン主体はゴム製であってその前面を平坦な面に形成しているので、先行側の管体の後端面に馴染性よく密着すると共にこのパッキン主体の後面における上記リング状パッキン部材とダミーパッキン部材とを除く部分にリング状パッキン部材とダミーパッキン部材との突出高さと同一厚みを有する低反発性弾性被覆層を層着しているので、この低反発性弾性被覆層が直線施工、曲線施工にかかわらず常に管体の対向面に密接して土砂等の流入を防止することができる。
【図面の簡単な説明】
【図１】パッキンの斜視図、
【図２】その分解斜視図、
【図３】管体間に介在させたパッキンの一部切欠き断面図、
【図４】管体の簡略縦断側面図、
【図５】管体の端面板の正面図、
【図６】管体間にパッキンを介在させた状態の縦断側面図、
【図７】その一部の拡大縦断側面図、
【図８】管体を推進、埋設している状態の簡略縦断側面図、
【図９】パッキン部材の断面図、
【図１０】別なパッキン部材の断面図、
【図１１】従来例を示す正面図、
【図１２】その管体間に介在させた状態の簡略縦断側面図。
【符号の説明】
Ｐパッキン
１パッキン主体
２〜６通孔
７ダミーパッキン部材
８低反発性弾性被覆層
Ａ管体
12〜16 パッキン部材
22 測量用孔
23〜26 管路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in packing interposed between pipes when the pipes are buried in the ground by a propulsion method.
[0002]
[Prior art]
When laying underground pipes such as electric wire laying pipes, gas, and water pipes in the ground by the propulsion method, first, a shield machine is dug from the start shaft side, and the temporary pipes are sequentially added to the shield machine and then the temporary pipes are followed. While the rear end of the tube row is pushed forward by a propulsion device disposed in the start shaft, it is propelled and buried up to the reaching shaft, and then the temporary tube and the buried tube are replaced. Then, in order to measure the propulsion direction and remove excavated earth and sand when propelling and burying the temporary pipe, the temporary pipe A is surveyed at the center of its front and rear end plates 20, 21 as shown in FIGS. The holes 22 and 22 are provided, and the inside and outside of the pipe lines 23 to 26 are arranged in parallel with each other such as the supply and discharge mud pipe lines 23 and 24, the lubricant supply pipe line 25, and the water supply pipe line 26. An opening is opened to the outside through the front and rear end face plates 20 and 21.
[0003]
Therefore, when connecting such temporary pipes, it is necessary to communicate between the open ends in a water-stopped state. For this reason, the applicant of the present application and the like is described in Japanese Patent Application Laid-Open No. 7-158743. A packing was developed. As shown in FIGS. 11 and 12, the packing has a ring-shaped flange portion 41a with an outer diameter substantially equal to the outer diameter of the temporary tube A protruding in the front-rear direction on the outer peripheral edge of the circular rigid plate 41, and Corresponding to the survey holes 22 and the open ends of the pipes 23 to 26 provided in the temporary pipe A, through holes 42 to 46 are formed in the rigid plate 41, and these through holes 42 to 46 are formed. The projection length in the front-rear direction has a dimension larger than the projection length in the front-rear direction of the ring-shaped flange portion 41a, and a short hole is formed by drilling a communication hole having the same diameter as the pipe lines 23 to 26 in the center portion. It has a structure formed by mounting cylindrical elastic packing members 52 to 56.
[0004]
[Problems to be solved by the invention]
However, when the temporary tube A is propelled by the propulsion device, the elastic packing members 52 to 56 of the packing are compressed by the propulsive force, and the front and rear end surfaces of the ring-shaped flange portion 41a abut against the opposing end surfaces of the adjacent temporary tube A. Therefore, when the temporary pipe A is constructed along the planned curve, the ring-shaped flange portion 41a on the bending direction side and the temporary pipe A are opposed to each other. The contact surface of the ring-shaped flange portion 41a and the temporary tube A gradually expands toward the outside curved in a convex arc shape with the contact portion as a fulcrum. The pressure contact force with the pipe end face with respect to the elastic packing member provided at a distant position is remarkably reduced, and if the bending degree of the planned curve is increased, it may be separated and the water stop function cannot be achieved. That fear there is, there is a problem that it is not suitable for the curve construction.
[0005]
Further, when the propulsive force is transmitted through the elastic packing members 52 to 56 without transmitting the propulsive force to the tube body A through the ring-shaped flange portion 41a, the survey of the temporary tube A is performed. Since the arrangement state of these elastic packing members 52 to 56 provided corresponding to the holes 22 and the respective pipelines 23 to 26 is not provided symmetrically in the vertical direction and the horizontal direction, these elastic packing members 52 The propulsive force transmitted to the tube A on the front side through -56 does not act equally on the tube A. Even if the propulsive force by the propulsion device acts on the surface of the tube A evenly, the tube There is a problem that A is biased in the vertical and horizontal directions and cannot be accurately propelled.
[0006]
When the propulsive force by the propulsion device is large, the elastic packing members 52 to 56 are greatly compressed beyond the elastic range on the tube A side close to the propulsion device, and the ring-shaped flange portion 41a becomes the tube body. A uniform propulsive force is transmitted to the tube body A through the flange portion 41a by contacting the end surface of A, but in this case also, the propulsive force transmitted to the tube body A on the shield machine side is reduced, The above problems will occur.
[0007]
The present invention has been made in view of such problems, and the object of the present invention is to make it possible to uniformly transmit the propulsive force to the propulsion pipe body such as a temporary pipe, and at the time of curve construction. The present invention also provides a packing for a propelling tube that can enable accurate construction without impairing the water stop function.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the packing for a propulsion tube according to the present invention is provided in the propulsion tube with a disk-shaped packing main body interposed between opposing end surfaces of the propulsion tube as described in claim 1. A propulsion tube packing in which a through hole is formed corresponding to each of the open ends of a plurality of pipelines, and a ring-shaped packing member is integrally provided on the outer peripheral edge of each through hole. A dummy packing member is attached to a predetermined portion of the packing main body so that the pressure distribution acting on the packing is vertically and horizontally symmetrical with respect to the horizontal and vertical lines passing through the center of the packing main body.
[0009]
In the propulsion tube packing according to claim 1, the invention according to claim 2 is characterized in that the packing main body is made of rubber and the front surface is formed on a flat surface, while the ring-shaped packing member is formed on the rear surface. A dummy packing member is protruded rearward with the same protruding height, and a ring-shaped packing member and a dummy packing member are provided on the rear surface of the packing main body excluding the ring-shaped packing member and the dummy packing member. It is characterized in that a low-rebound elastic coating layer having the same thickness as the projecting height is layered.
[0010]
[Action]
The packing is interposed between the rear end surface of the preceding tube and the front end surface of the succeeding tube when the tube is propelled and embedded, and the ring-shaped elastic packing members provided at a plurality of locations of the packing are opposed to each other. After placing the dummy packing member between the opposite end surfaces of the front and rear pipes, the length between the pipes is appropriately set. Connect with bolts. In this case, the bolts are not cut off, and the dimensions are set so that the tubes can bend each other. When both pipes are connected and propelled into the ground in this way, the elastic packing member and the dummy packing member are compressed by the propulsive force from the subsequent pipe side, and the subsequent pipe body is interposed via these elastic packing members and the dummy packing. The propulsive force is transmitted to the preceding pipe body and propelled and buried.
[0011]
At this time, the plurality of pipe lines arranged in the pipe body are asymmetrically arranged vertically and horizontally with respect to the horizontal and vertical lines passing through the center of the pipe body, and the diameters thereof are also different. The propulsive force that presses the rear end surface of the preceding tube through the elastic packing member provided on the packing main body corresponding to these pipe lines is the upper half side of the rear end surface of the preceding tube. In the packing of the present invention, a dummy packing member is attached, and the dummy packing member and the above are transmitted in different pressure distribution states on the lower half side, and the left side portion and the right side portion. The pressure distribution of the pressing force transmitted to the rear end face of the preceding pipe body through the packing main body by the compressive force with all the elastic packing members is in the vertical and horizontal directions with respect to the horizontal and vertical lines passing through the center of the packing main body. Because it is configured to be symmetrical Propulsion force acts uniformly over the entire surface of the tubular body, thereby enabling accurate propulsion without biasing the tube vertically and horizontally.
[0012]
Furthermore, even at the time of curve construction of the pipe body, the elastic packing member mounted on the bending direction side, i.e., inside the planned curve, is compressed evenly and larger than the compressed state at the time of linear construction, and the opposite side, i.e. The elastic packing member mounted on the outside of the planned curve that curves in a convex arc shape presses against the end face of the tube with an even restoring force from the compressed state during linear construction, and performs curved construction accurately in a predetermined direction Can do.
[0013]
Further, according to the invention of claim 2, since the packing main body is made of rubber and the front surface thereof is formed as a flat surface, the packing main body is in close contact with the rear end surface of the preceding pipe body, and this packing is used. Since a low-rebound elastic coating layer having the same thickness as the protruding height of the ring-shaped packing member and the dummy packing member is layered on a portion excluding the ring-shaped packing member and the dummy packing member on the rear surface of the main body. Regardless of whether the low-rebound elastic coating layer is straight or curved, it can be kept in close contact with the opposing surface of the pipe and prevent inflow of earth and sand.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes a disk having a constant thickness in which an outer diameter is substantially equal to an outer diameter of a tubular body A made of a temporary tube. The rubber packing main body of the shape, the through holes 2 to 6 are provided through the front and rear surfaces respectively in the portions corresponding to the open ends of a plurality of pipelines described later provided in the tube A, While the front surface of the packing main body 1 is entirely formed as a flat surface, the rear surface side has a ring-like shape with a constant protrusion height toward the rear edge of the open end of each of the through holes 2 to 6. The cylindrical packing members 12 to 16 are protruded, and a short cylindrical dummy packing member having the same protruding height as the ring-shaped packing members 12 to 16 is provided at a predetermined portion of the packing main body 1 other than the packing members 12 to 16. 7 is projected. Further, bolt insertion holes 9 are formed at a plurality of intervals on the outer peripheral portion of the packing main body 1 at regular intervals in the circumferential direction. The dummy packing member 7 and the ring-shaped packing members 12 to 16 are integrally formed with the packing main body 1 by the same rubber material as the packing main body 1.
[0015]
Further, on the rear surface of the packing main body 1, the dummy packing member 7 and the ring-shaped packing members 12 to 16 protrude on the entire rear surface of the packing main body 1 except the dummy packing member 7 and the ring-shaped packing members 12 to 16. A low resilience elastic coating layer 8 having the same thickness as the height is applied. As shown in FIG. 2, the low-rebound elastic coating layer 8 is a disc-shaped sponge having the same diameter as the packing main body 1 and the same thickness as the protruding heights of the ring-shaped packing members 12 to 16 and the dummy packing member 7. The opposing part of the dummy packing member 7 projecting from the packing main body 1 and the ring-shaped packing members 12 to 16 in the low-foaming elastic disk-shaped body 8 ′ made of a low-rebound elastic material such as foamed synthetic resin Further, fitting holes 82 to 87 for inserting the dummy packing member 7 and the ring-shaped packing members 12 to 16 are provided so as to penetrate between the front and rear surfaces and the packing main body 1 is provided on the outer peripheral portion. A bolt insertion hole 10 having a smaller diameter than that of the bolt insertion hole 9 is formed so as to face the bolt insertion hole 9.
[0016]
The disk-like body 8 'is overlapped with the rear surface of the packing main body 1 so that the opposite end surfaces are brought into close contact with each other, and the corresponding ring-shaped packing members 12-16 projecting from the packing main body 1 in the fitting holes 82-87 and the dummy packing. A packing P is formed in which the members 7 are respectively inserted and the bolt insertion holes 9 and 10 are matched.
[0017]
As shown in FIGS. 4 and 5, the tubular body A is provided with a circular survey hole 22 penetrating in the center of the front and rear end face plates 20 and 21, and the front and rear end face plates 20 and 21. Circular opening holes 23a and 24a are provided in the lower portions on both sides to communicate the front and rear opening ends of the feed and discharge mud pipes 23 and 24 arranged in parallel in the pipe body A, respectively. , 21 are provided with circular opening holes 25a and 26a that communicate with the open ends of pipes 25 and 26 such as a lubricant supply pipe and a water supply pipe disposed in the pipe P. is there. Further, bolt fastening holes 28 having a diameter smaller than that of the bolt insertion holes 9 provided in the packing main body 1 are provided at several positions on the outer peripheral portion of the front and rear end face plates 20 and 21. Reference numeral 29 denotes a hydraulic supply hose or a wiring groove that is recessed in the upper peripheral portion of the pipe body P over its entire length.
[0018]
A through hole 2 provided in the central portion of the packing main body 1 is formed to have the same diameter as the survey hole 22 of the pipe body A and communicates with the survey hole 22. The provided through holes 3 and 4 are formed to have the same diameter as the opening holes 23a and 24a of the above-mentioned feed and discharge mud conduits 23 and 24 of the pipe body A, and communicate with these opening holes 23a and 24a, respectively. Further, the through holes 5 and 6 provided in the upper left portion and the lower portion of the packing main body 1 have the same diameter as the opening holes 25a and 26a of the pipe lines 25 and 26 such as the above-described lubricant supply pipe and water pipe of the pipe body A. And are configured to communicate with these opening holes 25a and 26a. Further, the bolt insertion holes 9 and 10 provided in the outer peripheral portion of the packing P are matched with the bolt fastening holes 28 provided in the outer peripheral portion of the tube body A. The upper end of the packing P is provided with a notch 11 having the same cross-sectional shape as the housing groove 29 of the tube A and communicating with the housing groove 29.
[0019]
The mounting position of the dummy packing member 7 projecting from the rear end surface of the packing P is compressed by pressure from the direction in which the dummy packing member 7 and all the packing members 12 to 16 are orthogonal to the surface of the packing P. When this occurs, the pressure distribution acting on the entire surface of the packing main body 1 due to the compressive force is provided at positions that are vertically and horizontally symmetrical with respect to horizontal and vertical lines passing through the center of the packing main body 1. Thus, in order to set the position of the dummy packing member 7 so that the pressure distribution acting on the packing is vertically and horizontally symmetrical with respect to the horizontal and vertical lines passing through the center of the packing main body 1, the packing members 12- Although it is limited by the position of 16 and the diameter of the packing main body 1 or the like, it can be provided at a preferable position by changing the size (volume) of the dummy packing member 7.
[0020]
Next, the usage mode of the propulsion pipe packing P configured as described above will be described. As shown in FIG. 8, the shield machine 32 is started from the start shaft 31 toward the arrival shaft (not shown), Subsequent to the shield machine 32, the pipe body A as a temporary pipe is sequentially added and pushed by the propulsion device 33 installed in the start shaft 31 to be propelled and buried in the ground. At this time, when the pipe A to be buried next is connected to the rear end of the pipe A pushed into the ground in the start shaft 31, it is shown in FIG. 6 between the front and rear facing surfaces of both the pipes A and A. Thus, the packing P is interposed in the sandwiched state.
[0021]
The packing P is attached by placing the flat front surface of the packing P in close contact with the rear surface of the rear end face plate 21 of the front tube A and opening the through holes 2 to 6 in the rear end face plate 21. 22. Surveying hole 22 and opening hole 23a which are open to the front end face plate 20 of the rear tube A through the packing members 12 to 16 which communicate with the opening holes 23a to 26a and project from the rear surface. Bolts facing each other at a plurality of locations on the outer peripheral portions of both pipes A and A after bringing the dummy packing member 7 into close contact with the opposing surface of the front end face plate 20. The bolts 34 are inserted between the fastening holes 28 and 28 through the bolt insertion holes 9 and 10 provided in the outer peripheral portion of the packing P, and the nuts 35 are screwed together to be connected. At this time, the length of the bolt 34, that is, the interval between the front and rear end face plates 20, 21 of the two tubular bodies A, A is adjusted so as to be the length when the tubular bodies are bent at the maximum. When the bolts 34 are inserted, annular metal spacers 27 and 27 are arranged on the front and rear surfaces of the packing P in accordance with the bolt insertion holes 9 and 10 as shown in FIG. , 27, the opposed end face plates 20, 21 of the front and rear pipe bodies A, A are connected by bolts 34 and nuts 35. At this time, one metal spacer 27 is fitted into the bolt insertion hole 9 of the packing main body 1, and the other metal spacer 27 is brought into pressure contact with the outer surface of the bolt insertion hole 10 on the low-rebound resilience elastic coating layer 8 side. The low resilience elastic coating layer 8 is sandwiched between the metal spacers 27 and 27.
[0022]
In this way, the pipes are connected to each other while being sequentially propelled and buried in the ground toward the reach shaft side, and when the subsequent pipe is pushed by the propulsion device 33, the pressing force from the subsequent pipe is Acts in a direction orthogonal to the packing P, and the elastic packing members 12 to 16 and the dummy packing member 7 projecting from the rear surface of the packing main body 1 of the packing P, and the low resilience layered on the rear surface. The elastic covering layer 8 is compressed, and the propulsive force of the propulsion device 33 is transmitted to the tube P on the preceding side through the elastic force when compressed.
[0023]
At this time, since the pressure distribution acting on the packing P is configured to be vertically and horizontally symmetrical with respect to the horizontal and vertical lines passing through the center of the packing main body 1, the propulsive force from the succeeding tube A is Through the packing P, the entire surface is uniformly transmitted to the preceding tubular body A side.
[0024]
That is, in FIG. 3, the lower half of the rear surface of the packing main body 1 communicates with the lower half of the elastic packing member 12 projecting from the outer peripheral edge of the through hole 2 and the supply / discharge mud conduits 23 and 24. There are elastic packing members 13, 14 projecting from the outer peripheral edge of the through holes 3, 4, and an elastic packing member 16 projecting from the outer peripheral edge of the through hole 6 communicating with the water supply pipe 26. The upper half of the rear surface protrudes from the outer peripheral edge of the elastic packing member 12 projecting from the outer peripheral edge of the through hole 2 and the outer peripheral edge of the through hole 5 communicating with the lubricant supply pipe 25. When the packing member 15 and the dummy packing member 7 project and a pressure perpendicular to the surface of the packing P is applied, the packing is caused by compression of the elastic packing members 12, 13, 14 and 16 on the lower half side. The pressure acting on the entire lower half of P, the elastic packing members 12 and 15 and the dummy packing member 7 in the upper half The packing P is configured so that the pressure acting on the entire upper half of the packing P due to compression is equal. Similarly, the left half of the packing P due to compression of the elastic packing member in the left half of the packing P Since the pressure acting on the entire portion is equal to the pressure acting on the entire right half of the packing P due to compression of the elastic packing member and the dummy packing member 7 in the right half, the succeeding tube body The propulsive force of A can be transmitted to the preceding pipe body A through the packing P evenly in the vertical and horizontal directions, and the leading pipe body A can be accurately propelled without being biased.
[0025]
Furthermore, when the front and rear pipes A and A are refracted in the vertical and horizontal directions along the planned curve during the propulsion embedding of the pipe body A, when the pipe P is refracted in the bending direction, for example, in the right direction, A plurality of elastic packing members mounted at the same position in the right direction from the vertical line passing through the center compress evenly and larger than the compressed state at the time of linear construction, and a plurality of members mounted on the opposite side, that is, the left side The elastic packing member presses against the end face of the pipe body with a uniform restoring force from the compressed state at the time of straight construction at the portion at the position equal to the left direction from the above vertical line, and maintains the water-stopped state. Curve construction can be performed, and the same applies to the left direction or the vertical direction. In addition, when the pipe body A is applied in a straight line or in a curved line, the low repulsion elastic coating layer 8 prevents the earth and sand from entering between the front and rear pipe bodies A and A.
[0026]
In this way, the soil and sand excavated by the shield machine 32 through the sludge pipes 22 and 23 in the tubular body A communicated in series are propelled while being discharged to the start shaft 31 side. In addition, a buried pipe such as a gas pipe or a water pipe is sequentially propelled and buried from the start shaft 31 side, and replaced with the pipe body P previously buried as a temporary pipe.
[0027]
In the above tubular body propulsion method, the water pressure required for the supply and discharge mud pipelines 23 and 24 is low, and the water pressure required for the lubricant supply pipeline 25 is relatively large. As the elastic packing members 13 and 14 provided on the packing P corresponding to 23 and 24, the shape of the distal end portion to be crimped to the open end of the pipe line is formed as shown in FIG. Is formed on the packing P corresponding to the lubricant supply pipe 25 by forming the peripheral grooves 13a, 14a by engraving the entire surface by a certain depth from the end face to form the circumferential grooves 13a, 14a. As the elastic packing member 15, it is desirable to improve the water stop performance by forming the shape of the tip to be crimped to the open end of the pipe line on a flat surface as shown in FIG.
[0028]
【The invention's effect】
As described above, according to the packing for a propelling tube of the present invention, the open ends of a plurality of ducts provided in the propelling tube mainly on a disk-shaped packing having an outer diameter equal to the outer diameter of the propelling tube plate Are provided for the propulsion tube body in which a ring-shaped packing member is integrally provided on the outer peripheral edge of each through-hole, and the pressure distribution acting on the packing is mainly the packing. Since a dummy packing member is attached to a predetermined portion of the packing main body so as to be vertically and horizontally symmetrical with respect to a horizontal and vertical line passing through the center of the elastic packing member, an elastic packing member can be provided by interposing this packing between propulsion tubes. Of course, the elastic force at the time of compression of the dummy packing member and the elastic packing member is the main component of the packing. During ~ Because the pressure distribution is symmetrical in the vertical and horizontal directions on the packing with respect to the horizontal and vertical lines passing through the pipe, it is accurate without biasing the pipe body in the vertical and horizontal directions during straight and curved construction. Can be propelled in any direction.
[0029]
Further, according to the invention of claim 2, since the packing main body is made of rubber and the front surface thereof is formed as a flat surface, the packing main body is in close contact with the rear end surface of the preceding pipe body, and this packing is used. Since a low-rebound elastic coating layer having the same thickness as the protruding height of the ring-shaped packing member and the dummy packing member is layered on a portion excluding the ring-shaped packing member and the dummy packing member on the rear surface of the main body. Regardless of whether the low-rebound elastic coating layer is straight or curved, it can be kept in close contact with the opposing surface of the pipe and prevent inflow of earth and sand.
[Brief description of the drawings]
FIG. 1 is a perspective view of a packing,
FIG. 2 is an exploded perspective view thereof.
FIG. 3 is a partially cutaway cross-sectional view of a packing interposed between pipe bodies,
FIG. 4 is a simplified vertical side view of a tubular body,
FIG. 5 is a front view of an end face plate of a tubular body,
FIG. 6 is a longitudinal side view of a state in which packing is interposed between pipe bodies,
FIG. 7 is an enlarged vertical sectional side view of a part thereof,
FIG. 8 is a simplified longitudinal side view of a state in which a tubular body is propelled and embedded,
FIG. 9 is a cross-sectional view of a packing member,
FIG. 10 is a sectional view of another packing member;
FIG. 11 is a front view showing a conventional example;
FIG. 12 is a simplified longitudinal sectional side view showing a state of being interposed between the tubular bodies.
[Explanation of symbols]
P Packing 1 Packing main body 2 to 6 Through-hole 7 Dummy packing member 8 Low rebound elastic coating layer A Tube
12-16 Packing material
22 Survey hole
23-26 pipeline

Claims

推進管体の対向端面間に介在させる円板形状のパッキン主体に、推進管体内に設けている複数の管路の開口端にそれぞれ対応して通孔を穿設し、これらの通孔の外周縁にリング状のパッキン部材を一体に設けてなる推進管体用パッキンであって、このパッキンに作用する圧力分布がパッキン主体の中心を通る水平、垂直線に対して上下、左右対称となるように、パッキン主体の所定部分にダミーパッキン部材を取付けていることを特徴とする推進管体用パッキン。The disk-shaped packing main body interposed between the opposed end faces of the propelling pipe body is formed with through holes corresponding to the open ends of the plurality of pipe lines provided in the propelling pipe body. A packing for a propelling tube body in which a ring-shaped packing member is integrally provided on the periphery, and the pressure distribution acting on the packing is vertically and horizontally symmetrical with respect to a horizontal and vertical line passing through the center of the packing main body. Further, the propulsion tube packing is characterized in that a dummy packing member is attached to a predetermined portion of the packing main body.

パッキン主体はゴム製であってその前面を平坦な面に形成している一方、後面にリング状パッキン部材とダミーパッキン部材とを後方に向かって同一突出高さでもって突設してあり、さらに、これらのリング状パッキン部材とダミーパッキン部材とを除くパッキン主体の後面にリング状パッキン部材とダミーパッキン部材との突出高さと同一厚みを有する低反発性弾性被覆層を層着していることを特徴とする請求項１記載の推進管体用パッキン。While the packing main body is made of rubber and has a front surface formed on a flat surface, a ring-shaped packing member and a dummy packing member are projected rearward with the same protruding height on the rear surface. The low-rebound elastic coating layer having the same thickness as the protrusion height of the ring-shaped packing member and the dummy packing member is layered on the rear surface of the packing main body excluding the ring-shaped packing member and the dummy packing member. The packing for a propelling pipe body according to claim 1, wherein