JP3897537B2

JP3897537B2 - Displacement prevention device for tarpaulin frame in tunnel machine

Info

Publication number: JP3897537B2
Application number: JP2001087156A
Authority: JP
Inventors: 毅熾栄; 由紀夫芳賀; 哲治島田; 修一原; 義治松岡; 裕之尾崎; 栄一畑山; 雅也福居; 光慶竹本; 幸久平沢; 道明森田; 茂男藤井; 茂弘山田; 宏明富松
Original assignee: Taisei Corp; Hitachi Construction Machinery Co Ltd; Penta Ocean Construction Co Ltd; Okumura Corp
Current assignee: Taisei Corp; Hitachi Construction Machinery Co Ltd; Penta Ocean Construction Co Ltd; Okumura Corp
Priority date: 2001-03-26
Filing date: 2001-03-26
Publication date: 2007-03-28
Anticipated expiration: 2021-03-26
Also published as: JP2002285797A

Description

【０００１】
【発明の属する技術分野】
本発明はテールプレート内でセグメント被覆用防水シートを筒状に巻き立てるために配設している防水シート受けフレームが、テールプレートの軸心に対して傾動してテールプレートと当接したり、テールシール取付金具が防水シートを破損させるのを防止するためのトンネル掘進機における防水シート受けフレームの変位防止装置に関するものである。
【０００２】
【従来の技術】
トンネル掘進機により掘削したトンネルにセグメントを組み立てることによってトンネル覆工を施した場合、セグメント間の継目部分から地下水がトンネル内に浸入することが度々発生する。この場合、セグメント間の継手部には止水シールを取付けているが、セグメント覆工の施工誤差等によって継手部に目開きが発生した時には充分なシール効果を発揮させることができなくなる。
【０００３】
このため、セグメントの外周面をポリエチレン等の合成樹脂製防水シートによって被覆してセグメント間の継目部分の止水性を向上させる技術が開発されている。即ち、トンネル掘進機のテールプレート内で帯状の防水シート（以下、新設防水シートという）を、先に筒状に巻き立てた防水シート（以下、既設防水シートという）の前端部にその後端部を所定幅、重合させながら筒状に巻き立てると共に防水シートの対向端部の上記重合部を自走式溶着機等によって熱溶着することにより筒状の防水シートを形成し、この筒状防水シート内でセグメントを組み立てて該セグメントを筒状防水シートで被覆している。この筒状防水シートで被覆されたセグメントはトンネル掘進機の掘進に伴ってトンネル掘削壁面側に相対的に送り出される。
【０００４】
この際、上記防水シートは、柔軟で且つ適度の伸縮性を有する合成樹脂製シートよりなるため、円筒状に巻き立てる際に皺や波打ち状の凹凸、或いは垂れが生じやすく、新設防水シートと既設防水シートとの重合部を均一に熱溶着することが困難となる。
【０００５】
このため、トンネル掘進機のテールプレートの内周面適所に固定枠を固着してこの固定枠に可動枠を前後方向に移動自在に支持させると共に該可動枠に円筒形状の防水シート受けフレームの前端面を取付け、この受けフレームの内周面に帯状の防水シートを既設防水シートの前端部に所定幅だけ重ね合わせながら固定手段により受けフレームに押しつけて一巻き状に巻き立てることにより筒状の新設防水シートを形成し、この新設防水シートと既設防水シートとの端部対向面に可動枠に配設している溶着機の電気ゴテを挿入して周方向に移動させることによりこれらの防水シートの端部対向面を溶融させると共に溶融後、電気ゴテに後続する押圧ローラにより防水シートの重合部を受けフレーム側に押しつけることにより一体に重合、溶着させている。また、トンネル施工時間を短縮するために、この溶着と同時にトンネル掘進機を掘進させている。
【０００６】
【発明が解決しようとする課題】
しかしながら、上記防水シートの受けフレームはその前端を可動枠に片持ち状に支持させていると共にこの可動枠上での電気ゴテによる新設防水シートと既設防水シートとの重合部の溶着は可動枠の後端部上で行われるために、上記押圧ロールの押圧力によって受けフレームの軸心が前端部を支点として押圧方向に傾斜し、可動枠の後端角部がテールプレートに接触、当接してテールプレートを損傷させる虞れがあり、さらに、新たに組み立てたセグメントの前端角部に防水シートを押し付けて防水シートを破損させるという問題点があった。
【０００７】
一方、セグメントを被覆している筒状の既設防水シートがトンネル掘進機の掘進に従ってテールプレートから後方のトンネル掘削壁面側に相対的に送り出される時に、テールプレートの後端内周面に装着しているテールシールの取付金具が既設防水シートに摺接して既設防水シートが破れたり、或いは、溶着部が破損することになる。このため、テールシール取付金具の前方近傍部におけるテールプレートの内周面にこの取付金具よりも高さの大なる樹脂製の突条部材を取付けてテールシール取付金具が防水シートに接触するのを防止しているが、上述した受けフレームがテールプレートに接触することまでも防止することができないばかりでなく、受けフレームの後端面がこの突条部材にの後端面が突き当たって突条部材を破損させるという問題点があった。
【０００８】
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、テールプレートの後端部が防水シートと接触して防水シートを損傷させるのを防止し、且つ、防水シートの受けフレームがテールプレートと当接したり、防水シート防護突条部材と衝突したりするのを防止することができるトンネル掘進機における防水シート受けフレームの変位防止装置を提供するにある。
【０００９】
【課題を解決するための手段】
上記目的を達成するために請求項１に係る発明は、テールプレートの内周面に沿って配設した筒状の防水シート受けフレームと、この受けフレームの内周面に接してセグメント被覆用の帯状防水シートを先に巻き立てた防水シートの前端部にその後端部を重合させながら筒状に巻き立てる巻立装置と、これらの防水シートの重合部を一体に溶着する溶着装置とを備えたトンネル掘進機において、テールプレートの内周面にテールシール取付金具の高さよりも高い複数個の防水シート防護突条部材を周方向に所定間隔毎に取付けると共にこれらの防水シート防護突条部材の頂面で上記受けフレームの外周面を受止させるように構成している。
【００１０】
また、請求項２に係る発明は、トンネル掘進機のテールプレートの内周面にテールシール取付金具の高さよりも高い複数個の防水シート防護突条部材を周方向に所定間隔毎に取付ける一方、上記防水シート受けフレームの外周面に防水シート防護突条部材の高さよりも高い受けフレーム変位規制突条部材を上記防水シート防護突条部材を設けていないテールプレートの内周面に向かって周方向に所定間隔毎に取付けた構造としている。なお、防水シート防護突条部材及び受けフレーム変位規制突条部材は表面が平滑な合成樹脂材より形成されている。
【００１１】
【作用】
テールプレートの内周面に沿って配設した受けフレームの内方において一定幅を有する帯状の防水シートを円周方向に繰り出しながら巻立装置により受けフレームの内周面に接して筒状に巻き立てる。この際、先に巻き立てた筒状の既設防水シートの前端部上に上記帯状の防水シートの対向端部を重ね合わせながら筒状に巻き立てて新設防水シートを形成すると共に、この新設防水シートを適宜な固定手段によって受けフレームの内周面に押し付ける。
【００１２】
新設防水シートと既設防水シートとの上記重合部の溶着一体化は、新設防水シートと既設防水シートとの重合部における対向端部間、即ち、既設防水シートの前端部内周面とこの端部内周面上に重ねた新設防水シートの後端部外周面との間に溶着装置の溶着ゴテを挿入し、溶着ゴテを周方向に移動させることによって新設防水シートと既設防水シートとの対向面を溶融し、溶着ゴテの通過後に対向面を押圧ロールによって重合、溶着させることによって行われる。
【００１３】
この際、防水シート受けフレームは、防水シートを受けフレームの内周面に押し付ける固定手段の押圧力の偏りによってその軸心がテールプレートの軸心に対して傾斜し、大きな押圧力を受ける受けフレームの周壁部がテールプレート側に変位するが、請求項１に係る発明では、該受けフレームの後端部外周面がテールプレートの内周面に取付けている防水シート防護突条部材の頂面に受け止められてテールプレートに直接、接触することはなく、テールプレートの損傷が防止される。
【００１４】
また、上記防水シート防護突条部材は、テールシール取付金具の高さよりも高く形成されているからテールシール取付金具がセグメントを被覆している筒状の防水シートに摺接するのを阻止し、テールシール取付金具による防水シートの破損が防止される。
【００１５】
一方、請求項２に記載の防水シート受けフレームの変位防止装置は、この防水シート受けフレームの外周面に上記防水シート防護突条部材の高さよりも高い受けフレーム変位規制突条部材を防水シート防護突条部材を設けていないテールプレートの内周面に向かって周方向に所定間隔毎に取付けているから、防水シート受けフレームが上記溶着装置の押圧ロールや防水シート固定手段による押圧力の偏りでその軸心がテールプレートの軸心に対して傾斜しても、受けフレーム変位規制突条部材の頂部がテールプレートの内周面に摺接して受けフレームがテールプレートに直接、接触したり防水シート防護突条部材に衝突したりすることはない。また、防水シート防護突条部材によって、テールシール取付金具が防水シートに摺接するのを阻止して防水シートの破損を防止することができる。
【００１６】
【発明の実施の形態】
次に本発明の具体的な実施の形態を図面について説明する。図１において、１はトンネル掘進機であって、このトンネル掘進機１のテールプレート２内には、前後方向に移動自在な可動枠３が配設されてあり、この可動枠３にテールプレートの内周面に沿って配設した円筒状の鋼製受けフレーム４と、この受けフレーム４の内周面に接してセグメント被覆用の帯状防水シート５を円筒状に巻き立てて新設防水シート5Aを形成する巻立装置６と、先に円筒状に巻き立てた既設防水シート5Bと上記新設防水シート5Aとの重合部5Cを溶着一体化させる溶着装置７と、上記新設防水シート5Aの固定手段８と、上記既設防水シート5Bの固定手段９とを備えている。
【００１７】
上記可動枠３は、テールプレート２の内周面適所に固着している固定枠10に前後移動自在に支持されている。詳しくは、この固定枠10はテールプレート２の内周面にその外周端を一体に固着している円環形状の固定枠部10a と、この固定枠部10a の内周端に後方に向かって水平に突設している短筒形状の固定筒部10b とからなる一方、可動枠３はこの固定筒部10b の外周面に周方向には回動不能で前後方向にのみ摺動自在に被嵌した支持筒部3aと、この支持筒部3aの前端に内周端を一体に固着されているリング形状の垂直支持枠部3bとからなり、この垂直支持枠部3bの外周端に上記鋼製の受けフレーム４の前端を一体に固着してこの受けフレーム４を可動枠３の支持筒部3aの外周方において該支持筒部3aと平行に後方に向かって水平に突設している。なお、可動枠３の前後動は、固定枠部10a に固定されている移動用ジャッキ20によって行われる。
【００１８】
テールプレート２の後端部内周面には図２〜図４に示すように、テールシール11を装着しているテールシール取付金具12が取付けられてあり、このテールシール取付金具12の前方近傍部におけるテールプレート２の内周面及び前後取付金具12、12間の内周面にはテールプレート２の長さ方向に長いキャストナイロン樹脂等の表面が平滑面に形成され且つ適度の硬さを有すると共に強度、耐久性に優れた合成樹脂製の角棒材からなる複数の防水シート防護突条部材13がその長さ方向をテールプレート２の軸心に平行にしてテールプレート２の内周面に周方向に一定間隔毎に固着されている。この防水シート防護突条部材13は全長に亘ってその高さが上記テールシール取付金具12の高さよりも大きい一定高さに形成されている。
【００１９】
一方、上記防水シート受けフレーム４の後部外周面には、上記防水シート防護突条部材13と同一材料からなり、且つこの防水シート防護突条部材13よりも高さが高い受けフレーム変位規制突条部材14が複数個、周方向に一定間隔毎に取付けられている。例えば、円筒形状に組み立てられたセグメント19の外周面とテールプレート２の内周面との隙間が50mmで、防水シート５の厚みが２mm、テールプレート２と受けフレーム４との厚みが30mmである場合、防水シート防護突条部材13の高さを12mm、受けフレーム変位規制突条部材14の高さを15mmに形成している。
【００２０】
さらに、この受けフレーム変位規制突条部材14はテールプレート２と受けフレーム４を正面から見た場合、図３に示すように、テールプレート２に取付けられている防水シート防護突条部材13と周方向に交互に配設されてその頂面が隣接する防水シート防護突条部材13、13間に露出しているテールプレート２の内周面に対向し、受けフレーム４が上記固定枠10から後方に移動した時には隣接する防水シート防護突条部材13、13間にそれぞれの受けフレーム変位規制突条部材14が介入するように構成している。
【００２１】
なお、防水シート防護突条部材13と受けフレーム変位規制突条部材14とを必ずしも周方向に交互に配設することなく、受けフレーム変位規制突条部材14を防水シート防護突条部材13と重なり合わない位置で、テールプレート２の内周面に対して上下左右の位置に対向させた構造としておけばよい。また、防水シート防護突条部材13と受けフレーム変位規制突条部材14とは、キャストナイロン樹脂以外に表面が平滑で且つ適度な硬度を有する材質のものから形成しておけばよい。例えば、ポリエチレン、ホリエステル、ポリプロピレン等の合成樹脂やゴム、合成ゴムから形成しておけばよい。
【００２２】
上記可動枠３に配設されている巻立装置６と溶着装置７との具体的な構成について説明すると、図５に示すように上記可動枠３における支持筒部3aの外周面前部と後端部とに前後に小間隔を存して前後一対のリング状の支持フレーム15a 、15b 及び16a 、16b をそれぞれ立設状態で固着してあり、前側の支持フレーム15a 、15b の外周部間に複数個のローラ（図示せず）によって回転自在に支持された第１旋回リング17が配設されていてこの第１旋回リング17を受けフレーム４の前端部内周面から内方に小間隔を存した位置で円周方向に回転させるように構成している。
【００２３】
そして、上記巻立装置６は、この第１旋回リング17と、該第１旋回リング17の後面適所から図６に示すように、後方に向かって受けフレーム４の長さ方向に平行に突設した巻立てアーム18と、この巻立てアーム18に長さ方向に一定間隔毎に取付けている複数個のチャック金具21とから構成されてあり、このチャック金具21によって引き出される一定幅を有する帯状の防水シート５は巻芯にロール巻きされてこの巻装ロール22の巻芯の前端を上記固定枠10の枠部10a の後面適所に支持させて該巻装ロール22を受けフレーム４の内周面から小間隔を存した所定位置に固定的に配置し、帯状防水シート５の端部を上記チャック金具21によって掴持させて円周方向に引き出すように構成している。
【００２４】
一方、上記後側の支持フレーム16a 、16b の外周部間には複数個のローラ（図示せず）によって回転自在に支持された第２旋回リング23が配設されていてこの第２旋回リング23を受けフレーム４の後端内周面から内方に小間隔を存した位置で円周方向に回転させるように構成し、この第２旋回リング23に図７に示すように溶着装置７を取付けている。この溶着装置７は第２旋回リング23の外周部適所に固着している固定板24に装着された電熱ゴテ7Aと押圧ローラ7Bとからなり、電熱ゴテ7Aは、円筒状に巻き立てた既設防水シート5Bの前端部内周面とこの前端部内周面に重合させた新設防水シート5Aの後端部外周面との間に挿入してこれらの対向面を溶融させるものであり、押圧ローラ7Bは電熱ゴテ7Aの挿入により離間している新設防水シート5Aと既設防水シート5Bとの重合部5Cの対向面を電熱ゴテ7Aにより溶融させたのち、一定の圧着力でもって接合一体化させるものである。
【００２５】
なお、上記第１、第２旋回リング17、23の駆動手段は、図５に示すように可動枠３の支持筒部3aにおける前後部上に駆動モータ31、32を設置し、この駆動モータ31、32の回転軸に固着したピニオン33、34をこれらの第１、第２旋回リング17、23の内周面に形成している内歯車35、36に噛合させて、駆動モータ31、32によりそれぞれの旋回リング17、23を旋回動させるように構成している。
【００２６】
上記受けフレーム４の内周面に接して円筒状に巻き立てられる新設防水シート5Aは、固定手段８によって受けフレーム４に押しつけられた状態に保持される。この固定手段８は図８の左半部及び図９に示すように、可動枠３の支持筒部3aの外周面に周方向に小間隔毎に複数個、固定されている押圧ジャッキ8Aからなり、この押圧ジャッキ8Aのピストンロッドの先端に新設防水シート5Aの内周面における上記既設防水シート5Bとの重合部5Cを除く部分を受けフレーム４の内周面に押し付けて新設防水シート5Aに垂れ等を生じさせないようにする押さえ部材8Bを固着している。
【００２７】
一方、既設防水シート5Bの前端部を固定する固定手段９は、可動枠３の後端部外周面に、図８の右半部に示すように、周方向に小間隔毎に固定された複数個の押圧ジャッキ9Aからなり、この押圧ジャッキ9Aのピストンロッドの先端に既設防水シート5Bの前端部内周面を受けフレーム４の後端部内周面に押し付けて既設防水シート5Bの端部に垂れ等を生じさせないようにする押さえ部材9Bを固着している。
【００２８】
次に、上記各装置及び手段の作用を述べる。まず、図１、図10に示すように、固定枠10の固定枠部10a に装着している移動用ジャッキ20を伸長させて可動枠３を固定枠10内に収納すると共に該可動枠３の後方において、テールプレート２の後端部内でテールプレート２の内周面に沿ってエレクター（図示せず）により既に円筒形状に組み立てたセグメント19の外周面の前半部を先に巻き立てた既設防水シート5Bの後半部によって被覆し、さらに、セグメント19から突出した該既設防水シート5Bの前端部を固定手段９の押さえ部材9Bによって垂れや皺を生じさせることなく緊張した状態に受けフレーム４の後端部内周面に押し付け、且つシールドジャッキ25は可動枠３の垂直支持枠部3bに設けている切欠部を貫通してそのロッド先端のスプレッダ25a を上記セグメント19の前端面に押しつけている。
【００２９】
この状態において、図６に示すように、固定枠10側に片持ち状に支持されている帯状防水シート５の巻装ロール22の先端を第１旋回リング17に片持ち状に支持されている巻立てアーム18に装着したチャック金具21により掴持させたのち、第１旋回リング17を旋回動させると、巻立てアーム18が受けフレーム４の内周面に沿って周方向に移動して、巻装ロール22に巻回している帯状防水シート５を該巻装ロール22から円周方向に引き出しながら、該防水シート５を受けフレーム４の内周面上に円筒状に巻き立てて新設防水シート5Aを形成する。
【００３０】
この新設防水シート5Aの形成時には、その後端部の外周面を受けフレーム４の後端部内周面に受止されている既設防水シート5Bの前端部内周面に重ね合わせると共に受けフレーム４の内周面上に一巻きした新設防水シート5Aの両端部を重ね合わせ状態にしたのち、巻装ロール22を撤去すると共にこの新設防水シート5Aを固定手段８の全ての押圧ジャッキ8Aの押さえ部材8Bにより受けフレーム４の内周面に押し付けて円筒形状を維持させる。
【００３１】
この際、受けフレーム４は可動枠３の垂直支持枠部3bにその前端部を片持ち状に支持されているので、新設防水シート5A及び既設防水シート5Bを受けフレーム４の内周面に押しつけて固定させる上記複数の固定手段８、９の押圧ジャッキ8A、9Aによる押さえ部材8B、9Bの押圧力が異なったり、或いは、防水シート５の巻き立てに従って固定手段８、９を順次、押し付けた場合には、その軸心がテールプレート２の軸心に対して前端から後端に向かって傾斜する方向に変位する。
【００３２】
即ち、複数の固定手段８、９の押圧力の強弱によって受けフレーム４は強い押圧力を受ける部分がその前端から後端に向かってテールプレート２側に変位し、その押圧力よりも弱い押圧力を受ける部分がテールプレート２から離間して既設防水シート5Bの外周面に圧接する方向に変位するが、受けフレーム４の外周面には複数の受けフレーム変位規制突条部材14を周方向に一定間隔毎に設けているので、上記のように受けフレーム４の軸心が傾動、変位すると、テールプレート２側に変位する側においては、僅かに変位した時にこの受けフレーム変位規制突条部材14がテールプレート２の内周面に接して受けフレーム４がそれ以上、変位するのを阻止され、テールプレート２は受けフレーム４によって損傷される虞れはないと共に、既設防水シート5B側に変位する側においては、この既設防水シート5Bに強く圧着するのを阻止されて防水シート5Bの破損を防止するものである。
【００３３】
受けフレーム４の内周面に対する新設防水シート5Aの巻き立てが完了すると、新設防水シート5Aと既設防水シート5Bとの重合部5Cを受けフレーム４の内周面に押しつけている固定手段９による固定を解くと共に、溶着装置７の電気ゴテ7Aを新設防水シート5Aと既設防水シート5Bとの重合部5C内、即ち、新設防水シート5Aの後端部外周面と既設防水シート5Bの前端部内周面との間に図７に示すように挿入して第２旋回リング23を旋回させることにより電熱ゴテ7Aを円周方向に移動させて新設防水シート5Aと既設防水シート5Bとの重合部5Cを離間させながらその離間した対向面を加熱、溶融する。
【００３４】
さらに、電熱ゴテ7Aの移動に後続して電熱ゴテ7Aと一体に押圧ローラ7Bが電熱ゴテ7Aの移動した直後の新設防水シート5Aと既設防水シート5Bとの対向面における新設防水シート5Aの内周面を既設防水シート5B側に押圧して電熱ゴテ7Aにより溶融されたシート対向面を再び、重合させ、皺を生じさせることなく確実に全面的に溶着させる。溶着された新設防水シート5Aと既設防水シート5Bとの重合部5Cは固定手段９の押さえ部材9Bによって押しつける。
【００３５】
上記受けフレーム４の内周面に巻き立てる新設防水シート5Aの形成と、新設防水シート5Aの形成後における溶着装置７による新設防水シート5Aと既設防水シート5Bとの重合部5Cの溶着工程は、トンネル施工時間の短縮を図るために、トンネル掘進機１の掘進と並行して行われる。即ち、トンネル掘進機１のシールドジャッキ25を伸長させてセグメント19により推進反力をとりながら掘進すると同時に移動用ジャッキ20を同一速度でもって伸長させて図11に示すように、固定枠10から可動枠３を後方に押し出す。
【００３６】
この時、新設防水シート5Aと既設防水シート5Bとの重合部を圧着させる上記押圧ローラ7Bの押圧力により、受けフレーム４が上記同様にその軸心をテールプレート２の軸心に対して傾斜するが、上述したように受けフレーム４の外周面に取付けている受けフレーム変位規制突条部材14がテールプレート２の内周面に当接、受止されてテールプレート２や既設防水シート5Bの損傷を防止することができる。
【００３７】
また、可動枠３が固定枠10内に収納している状態においては、受けフレーム４の外周面に取付けている受けフレーム変位規制突条部材14の後端とテールプレート２の内周面に取付けている防水シート防護突条部材13の前端が小間隔を存して対向しているが、可動枠３が後方へ移動した時に、図２（イ）に示すように受けフレーム４が防水シート防護突条部材13を取付けているテールプレート２の後端部内周面に重なり合うことになる。
【００３８】
しかしながら、受けフレーム４に取付けている受けフレーム変位規制突条部材14とテールプレート２に取付けている防水シート防護突条部材13とが互いに重なり合わないように周方向にずらした位置に設けているので、図２（イ）（ロ）及び図３に示すように、隣接する防水シート防護突条部材13、13間の空間部に受けフレーム変位規制突条部材14が介入し、受けフレーム変位規制突条部材14の後端面が防水シート防護突条部材13の前端面に衝突するようなことはない。また、受けフレーム変位規制突条部材14の高さを防水シート防護突条部材13よりも高く形成しているので、防水シート防護突条部材13が受けフレーム４の外周面に当接することはない。なお、固定枠10内に可動枠３が収納されている状態においても、受けフレーム変位規制突条部材14の後端部を防水シート防護突条部材13、13の前端部間に介入させている構造としておいてもよい。
【００３９】
さらに、セグメント19を被覆した円筒状の既設防水シート5Bは、トンネル掘進機１の掘進に従ってセグメント19の外周面を被覆した状態でセグメント19と一体にテールプレート２の後端内周面に装着しているテールシール11にその外周面を摺接させながら図２（ロ）に示すように、テールプレート２の後端から後方に送り出されるが、その際、テールプレート２の軸心がセグメント19の軸心に対して傾斜しても、テールプレート２の内周面に取付けている上記防水シート防護突条部材13が既設防水シート5Bに摺接してテールシール取付金具12が既設防水シート5Bに接するのを防止し、テールシール取付金具12による既設防水シート5Bの破損を防止することができる。
【００４０】
こうして、新設防水シート5Aの後端部を既設防水シート5Bの前端部に溶着により一体に接続したのち、固定手段８、９の押さえ部材8B、9Bによる新設防水シート5Aの内周面と重合部5Cとに対する押さえを解き、しかるのち、図11に示すように移動用ジャッキ20を収縮させることによって巻立装置６や溶着装置７等を配設している可動枠３を固定枠10内に収納すると共にシールドジャッキ25を収縮させて既設セグメント19から前方に離間させる。
【００４１】
そうすると、新設防水シート5A内にセグメント19の組み立てが可能な空間部が設けられるので、この空間部で新たなセグメント19を図２（ハ）（ニ）に示すように、既設セグメント19から突出した既設防水シート5Bの前半部内周面と新設防水シート5Aの後半部内周面間に亘ってこれらの防水シートの内周面に沿って組み立てる。この際、新設防水シート5Aの前端部内周面を可動枠３の後端部に設けている上記既設防水シート5Bの固定手段９の押さえ部材9Bによって押さえて新設防水シート5Aに垂れが生じないようにしておくと共に防水シート巻装ロール22をセットしておく。
【００４２】
セグメント19の組立後、シールドジャッキ25を伸長させて新設セグメント19の前端面に当接させると共にさらに伸長させてこの新設セグメント19に反力をとってトンネル掘進機１を掘削させると同時にトンネル掘進機１の掘進に同調して上述したように移動用ジャッキ20を同一速度で伸長させて固定枠10から可動枠３を後方に押し出し、この可動枠３の移動中に再び上述したように、巻立装置６による受けフレーム４の内周面上への新設防水シート5Aの巻き立て作業と巻き立て後における溶着装置７による新設防水シート5Aと先に巻き立てた防水シート5Bとの重合部の溶着作業、セグメント19の組み立て作業を順次行うものである。
【００４３】
以上の実施例においては、受けフレーム４の変位を規制するために、該受けフレーム４の外周面に複数の受けフレーム変位規制突条部材14を取付けているが、このような受けフレーム変位規制突条部材14を設けることなく、図12に示すようにテールプレート２の内周面に取付けている全ての防水シート防護突条部材13' の長さをその前端が固定枠10の近傍部に達するまで前方に向かって長く形成しておいてもよい。
【００４４】
このように構成しておけば、テールシール取付金具12よりも高さの高いこれらの防水シート防護突条部材13' によってテールシール取付金具12がセグメント19を被覆している防水シート5Bの外周面に接するのを防止することができるのは勿論、受けフレーム４の内周面に防水シート５を巻き立てて新設防水シート5Aを形成する際、及び、該新設防水シート5Aと既設防水シート5Bとの重合部を溶着装置７によって溶着する際に、固定手段８、９による防水シート押圧力の偏りや押圧ローラ7Bの押圧位置によって受けフレーム４の軸心がテールプレート２の軸心に対して傾斜しても、受けフレーム４の後端部外周面がこの防水シート防護突条部材13の頂面によって受止されてそれ以上の変位を阻止され、受けフレーム４がテールプレート２に当接するのを防止することができる。
【００４５】
しかしながら、防水シート防護突条部材13の目的は、既設防水シート5Bがテールシール取付金具12と接触するのを防止することにあってこの防水シート防護突条部材13もセグメント19を被覆している既設防水シート5Bと接触しないことが望ましいので、この防水シート防護突条部材13とセグメント19間の隙間はできるだけ余裕があるのが好ましい。これに対して、受けフレーム変位規制突条部材14の目的は、受けフレーム４とテールプレート２との接触を防止することにあり、構造としてできるだけ受けフレーム４を傾斜させたくないので、該受けフレーム変位規制突条部材14とテールプレート２との隙間をできるだけ小さくすることが望ましい。従って、上記図12に示すように、防水シート防護突条部材13' を固定枠10の後端近傍部にまで延長するよりは、先に実施例としてあげたように、テールプレート２の内周面に取付けた防水シート防護突条部材13とは別に受けフレーム４の外周面に変位規制突条部材14を取付けておくことが好ましい。
【００４６】
【発明の効果】
以上のように請求項１に係る発明によれば、テールプレートの内周面に沿って配設した筒状の防水シート受けフレームと、この受けフレームの内周面に接してセグメント被覆用の帯状防水シートを先に巻き立てた防水シートの前端部にその後端部を重合させながら筒状に巻き立てる巻立装置と、これらの防水シートの重合部を一体に溶着する溶着装置とを備えたトンネル掘進機において、テールプレートの内周面にテールシール取付金具の高さよりも高い複数個の防水シート防護突条部材を周方向に所定間隔毎に取付けると共にこれらの防水シート防護突条部材の頂面で上記受けフレームの外周面を受止させるように構成しているので、防水シートを受けフレームの内周面に押し付ける固定手段の押圧力の偏りや溶着装置の押圧ロールの押圧力によって受けフレームの軸心がテールプレートの軸心に対して傾動、変位しても、僅かな変位によって該受けフレームを防水シート防護突条部材の頂面によって受止させることができ、従って、受けフレームがテールプレートに直接、接触することはなく、テールプレートの損傷を確実に防止することができる。
【００４７】
さらに、受けフレームの軸心の変位量を極く僅かとなるように規制することができるから、受けフレームの内周面に対する防水シートの巻き立て作業や巻き立てた新設防水シートと既設防水シートとの重合部の溶着作業が円滑且つ正確に行うことができる。
【００４８】
また、上記防水シート防護突条部材は、テールシール取付金具の高さよりも高く形成されているからテールシール取付金具がセグメントを被覆している筒状の防水シートに摺接するのを阻止し、テールシール取付金具による防水シートの破損を防止することができる。
【００４９】
請求項２に係る発明によれば、トンネル掘進機のテールプレートの内周面にテールシール取付金具の高さよりも高い複数個の防水シート防護突条部材を周方向に所定間隔毎に取付ける一方、上記防水シート受けフレームの外周面に防水シート防護突条部材の高さよりも高い受けフレーム変位規制突条部材を上記防水シート防護突条部材を設けていないテールプレートの内周面に向かって周方向に所定間隔毎に取付けた構造としているので、防水シート防護突条部材によって、テールシール取付金具が防水シートに摺接するのを阻止して防水シートの破損を防止することができるのは勿論、防水シート受けフレームが溶着装置の押圧ロールや防水シート固定手段による押圧力の偏りでその軸心がテールプレートの軸心に対して傾斜しても、受けフレーム変位規制突条部材の頂部がテールプレートの内周面に摺接して受けフレームがテールプレートに直接、接触したり防水シート防護突条部材に衝突したりするのを確実に防止することができる。
【００５０】
さらに、受けフレームの外周面に取付けている防水シート防護突条部材とテールプレートの内周面に取付けている受けフレーム変位規制突条部材とが互いに重なり合わないように周方向にずらした位置に設けているので、受けフレーム変位規制突条部材の後端面を防水シート防護突条部材の前端面に衝突させることなく隣接する防水シート防護突条部材間に介入させながら受けフレームを確実にテールプレートの後端部側に移動させることができ、その上、受けフレーム変位規制突条部材の高さを防水シート防護突条部材よりも高く形成しているので、防水シート防護突条部材が受けフレーム４の外周面に当接することはないと共に受けフレームの軸心の変位量を最小限度に抑制することができて受けフレームの内周面に対する防水シートの巻き立て作業や巻き立てた新設防水シートと既設防水シートとの重合部の溶着作業を一層円滑且つ正確に行うことができ、防水シートに皺等が発生するのを極力防止することができる。
【図面の簡単な説明】
【図１】トンネル掘進機全体の簡略縦断側面図、
【図２】（イ）及び（ロ）は掘進開始時から終了時までの防水シート防護突条部材と受けフレーム変位規制突条部材との移動状態を示すテールプレート下周部側の拡大縦断側面図、（ハ）及び（ニ）は受けフレームの前進後におけるセグメント組立と防水シートの巻き立て状態を示すテールプレート下周部側の拡大縦断側面図、
【図３】防水シート防護突条部材と受けフレーム変位規制突条部材との配列状態を示す一部の縦断正面図、
【図４】その一部の拡大縦断側面図、
【図５】巻立装置と溶着装置を備えた可動枠部分の簡略縦断側面図、
【図６】巻立装置部分の斜視図、
【図７】溶着を行っている受けフレーム部分の拡大縦断正面図、
【図８】固定手段を装着したテールプレート部分の簡略縦断正面図、
【図９】固定手段を装着した可動枠部分の簡略縦断側面図、
【図１０】固定枠内に可動枠を収納している状態の簡略縦断側面図、
【図１１】固定枠から可動枠を押し出した状態の簡略縦断側面図、
【図１２】本発明の別な防水シート受けフレームの変位防止装置を示す一部の拡大縦断側面図。
【符号の説明】
１トンネル掘進機
２テールプレート
３可動枠
４受けフレーム
５防水シート
5A 新設防水シート
5B 既設防水シート
5C 重合部
６巻立装置
７溶着装置
８、９固定手段
10 固定枠
13 防水シート防護突条部材
14 受けフレーム変位規制突条部材[0001]
BACKGROUND OF THE INVENTION
In the present invention, the tarpaulin receiving frame arranged to wind the segment covering tarpaulin into a cylindrical shape in the tail plate is tilted with respect to the axis of the tail plate and comes into contact with the tail plate. The present invention relates to a displacement prevention device for a waterproof sheet receiving frame in a tunnel machine for preventing a seal mounting bracket from damaging a waterproof sheet.
[0002]
[Prior art]
When tunnel lining is performed by assembling segments into a tunnel excavated by a tunnel excavator, groundwater often enters the tunnel from the joint between the segments. In this case, a water-stop seal is attached to the joint between the segments. However, when an opening occurs in the joint due to a construction error of the segment lining, a sufficient sealing effect cannot be exhibited.
[0003]
For this reason, a technique has been developed in which the outer peripheral surface of a segment is covered with a waterproof sheet made of a synthetic resin such as polyethylene to improve the water stoppage of a joint portion between segments. That is, a belt-shaped waterproof sheet (hereinafter referred to as a new waterproof sheet) is placed in the tail plate of a tunnel machine, and a rear end portion is provided at the front end of a waterproof sheet (hereinafter referred to as an existing waterproof sheet) wound up in a cylindrical shape. A cylindrical waterproof sheet is formed by winding up a predetermined width of the cylindrical sheet while polymerizing and heat-sealing the overlapping portion at the opposite end of the waterproof sheet with a self-propelled welding machine or the like. The segments are assembled by covering the segments with a cylindrical waterproof sheet. The segment covered with the tubular waterproof sheet is relatively sent to the tunnel excavation wall surface side with the excavation of the tunnel excavator.
[0004]
At this time, since the waterproof sheet is made of a synthetic resin sheet that is flexible and has an appropriate stretchability, it tends to cause wrinkles, wavy irregularities, or dripping when rolled up in a cylindrical shape. It becomes difficult to heat-weld the overlapping portion with the waterproof sheet uniformly.
[0005]
Therefore, a fixed frame is fixed to an appropriate position on the inner peripheral surface of the tail plate of the tunnel excavator, and the movable frame is supported by the fixed frame so as to be movable in the front-rear direction, and the front end of the cylindrical tarpaulin receiving frame is supported on the movable frame. A new tubular structure is created by attaching a surface and placing a belt-shaped waterproof sheet on the inner peripheral surface of the receiving frame over the front end of the existing waterproof sheet by a predetermined width and pressing it against the receiving frame by fixing means. By forming a waterproof sheet and inserting an electric iron of a welding machine disposed on the movable frame into the end facing surface of the newly installed waterproof sheet and the existing waterproof sheet and moving them in the circumferential direction, After the end facing surface is melted and melted, it is polymerized and welded together by pressing the overlapping part of the waterproof sheet against the frame side with the pressing roller following the electric iron To have. Also, in order to shorten the tunnel construction time, the tunnel digging machine is digged simultaneously with this welding.
[0006]
[Problems to be solved by the invention]
However, the front end of the tarpaulin receiving frame is supported by the movable frame in a cantilevered manner, and welding of the overlapping portion of the newly installed tarpaulin and the existing tarpaulin by the electric iron on the movable frame Since it is performed on the rear end portion, the axial center of the receiving frame is inclined in the pressing direction with the front end portion as a fulcrum by the pressing force of the pressing roll, and the rear end corner portion of the movable frame contacts and abuts the tail plate. There is a possibility that the tail plate may be damaged, and there is another problem that the waterproof sheet is damaged by pressing the waterproof sheet against the front end corner of the newly assembled segment.
[0007]
On the other hand, when the tubular existing tarpaulin covering the segment is sent relatively from the tail plate to the rear tunnel wall surface according to the tunneling machine, it is attached to the inner peripheral surface of the tail end of the tail plate. The mounting fitting of the tail seal is in sliding contact with the existing waterproof sheet, and the existing waterproof sheet is torn or the welded portion is damaged. For this reason, it is necessary to attach a resin protrusion member having a height higher than the mounting bracket to the inner peripheral surface of the tail plate in the vicinity of the front of the tail seal mounting bracket so that the tail seal mounting bracket contacts the waterproof sheet. Although not only prevents the above-mentioned receiving frame from contacting the tail plate, but also the rear end surface of the receiving frame hits this protruding member and breaks the protruding member. There was a problem of letting.
[0008]
The present invention has been made in view of such problems, and an object thereof is to prevent the rear end portion of the tail plate from coming into contact with the waterproof sheet and damaging the waterproof sheet, and the waterproof sheet. It is an object of the present invention to provide a displacement preventing device for a waterproof sheet receiving frame in a tunnel machine capable of preventing the receiving frame from coming into contact with a tail plate or colliding with a waterproof sheet protective ridge member.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is directed to a tubular waterproof sheet receiving frame disposed along an inner peripheral surface of a tail plate, and a segment covering layer in contact with the inner peripheral surface of the receiving frame. A winding device that winds the rear end portion into a cylindrical shape while polymerizing the rear end portion thereof on the front end portion of the waterproof sheet that has been rolled up in advance, and a welding device that integrally welds the overlapping portions of these waterproof sheets. In the tunnel excavator, a plurality of waterproof sheet protective ridge members, which are higher than the height of the tail seal mounting bracket, are attached to the inner peripheral surface of the tail plate at predetermined intervals in the circumferential direction, and the tops of these waterproof sheet protective ridge members are mounted. The outer peripheral surface of the receiving frame is received by the surface.
[0010]
Further, in the invention according to claim 2, while attaching a plurality of waterproof sheet protective protrusion members higher than the height of the tail seal mounting bracket to the inner peripheral surface of the tail plate of the tunnel excavator at a predetermined interval in the circumferential direction, A receiving frame displacement restricting ridge member higher than the height of the waterproof sheet protective ridge member on the outer peripheral surface of the waterproof sheet receiving frame is circumferentially directed toward the inner peripheral surface of the tail plate not provided with the waterproof sheet protective ridge member. It is set as the structure attached to every predetermined interval. In addition, the waterproof sheet protection protrusion member and the receiving frame displacement restriction protrusion member are formed of a synthetic resin material having a smooth surface.
[0011]
[Action]
A belt-shaped waterproof sheet having a constant width is drawn out in the circumferential direction on the inner side of the receiving frame disposed along the inner peripheral surface of the tail plate, and is wound in a cylindrical shape by contacting the inner peripheral surface of the receiving frame with a winding device. Stand up. At this time, the newly formed waterproof sheet is formed by winding up the tubular waterproof sheet on the front end of the previously wound cylindrical waterproof sheet while winding up the opposite end of the belt-shaped waterproof sheet to form a new waterproof sheet. Is pressed against the inner peripheral surface of the receiving frame by an appropriate fixing means.
[0012]
The welded integration of the above-mentioned overlapping portion between the newly installed waterproof sheet and the existing waterproof sheet is performed between the opposing ends of the overlapping portion of the newly installed waterproof sheet and the existing waterproof sheet, that is, the inner peripheral surface of the front end portion of the existing waterproof sheet and the inner periphery of this end portion Insert the welding iron of the welding device between the rear end of the new waterproof sheet stacked on the surface and move the welding iron in the circumferential direction to melt the facing surface of the new waterproof sheet and the existing waterproof sheet. Then, after passing the welding iron, the opposite surface is polymerized and welded by a pressing roll.
[0013]
At this time, the waterproof sheet receiving frame receives the large pressing force because its axis is inclined with respect to the axis of the tail plate due to the bias of the pressing force of the fixing means for pressing the waterproof sheet against the inner peripheral surface of the frame. However, in the invention according to claim 1, the outer peripheral surface of the rear end portion of the receiving frame is located on the top surface of the waterproof sheet protective ridge member attached to the inner peripheral surface of the tail plate. It is received and does not contact the tail plate directly, and damage to the tail plate is prevented.
[0014]
Further, since the above-mentioned waterproof sheet protective projection member is formed higher than the height of the tail seal mounting bracket, the tail seal mounting bracket prevents the tail seal mounting bracket from slidingly contacting the cylindrical waterproof sheet covering the segment. The waterproof sheet is prevented from being damaged by the seal mounting bracket.
[0015]
On the other hand, in the waterproof sheet receiving frame displacement prevention device according to claim 2, the receiving frame displacement regulating ridge member higher than the height of the waterproof sheet protective ridge member is provided on the outer peripheral surface of the waterproof sheet receiving frame. Since the waterproof sheet receiving frame is attached at predetermined intervals in the circumferential direction toward the inner peripheral surface of the tail plate not provided with the protrusion member, the waterproof sheet receiving frame is not biased by the pressing roll or the waterproof sheet fixing means of the welding device. Even if its axis is inclined with respect to the axis of the tail plate, the top of the receiving frame displacement regulating ridge member is in sliding contact with the inner peripheral surface of the tail plate so that the receiving frame directly contacts the tail plate or is waterproof. There is no collision with the protective ridge member. In addition, the waterproof sheet protective protrusion member can prevent the tail seal mounting bracket from slidingly contacting the waterproof sheet, thereby preventing the waterproof sheet from being damaged.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a tunnel excavator, and a movable frame 3 movable in the front-rear direction is disposed in the tail plate 2 of the tunnel excavator 1, and the tail plate of the tail plate 2 is disposed on the movable frame 3. A cylindrical steel receiving frame 4 disposed along the inner peripheral surface, and a strip-shaped waterproof sheet 5 for covering the segment in a cylindrical shape in contact with the inner peripheral surface of the receiving frame 4 to form a new waterproof sheet 5A The winding device 6 to be formed, the welding device 7 for welding and integrating the overlapping portion 5C of the existing waterproof sheet 5B previously wound in a cylindrical shape and the new waterproof sheet 5A, and the fixing means 8 for the new waterproof sheet 5A And fixing means 9 for the existing waterproof sheet 5B.
[0017]
The movable frame 3 is supported by a fixed frame 10 fixed at a suitable position on the inner peripheral surface of the tail plate 2 so as to be movable back and forth. Specifically, the fixed frame 10 has an annular fixed frame portion 10a in which the outer peripheral end is integrally fixed to the inner peripheral surface of the tail plate 2, and the inner peripheral end of the fixed frame portion 10a toward the rear. On the other hand, the movable frame 3 cannot be rotated in the circumferential direction on the outer peripheral surface of the fixed cylindrical portion 10b, and is slidable only in the front-rear direction. The support cylinder part 3a fitted and a ring-shaped vertical support frame part 3b whose inner peripheral end is integrally fixed to the front end of the support cylinder part 3a. The steel is formed on the outer peripheral end of the vertical support frame part 3b. A front end of the made receiving frame 4 is fixed integrally, and the receiving frame 4 is provided in a projecting manner in the outer periphery of the supporting cylinder part 3a of the movable frame 3 in a horizontal direction parallel to the supporting cylinder part 3a. The longitudinal movement of the movable frame 3 is performed by a moving jack 20 fixed to the fixed frame portion 10a.
[0018]
As shown in FIGS. 2 to 4, a tail seal mounting bracket 12 to which a tail seal 11 is attached is mounted on the inner peripheral surface of the rear end portion of the tail plate 2. In the inner peripheral surface of the tail plate 2 and the inner peripheral surface between the front and rear mounting brackets 12 and 12, a surface such as cast nylon resin which is long in the length direction of the tail plate 2 is formed as a smooth surface and has an appropriate hardness. In addition, a plurality of waterproof sheet protective ridge members 13 made of a synthetic resin square bar material excellent in strength and durability are arranged on the inner peripheral surface of the tail plate 2 with the length direction parallel to the axis of the tail plate 2 It is fixed at regular intervals in the circumferential direction. The waterproof sheet protective ridge member 13 is formed at a constant height over its entire length, which is greater than the height of the tail seal mounting bracket 12.
[0019]
On the other hand, the outer peripheral surface of the rear portion of the waterproof sheet receiving frame 4 is made of the same material as the waterproof sheet protective protrusion member 13 and is higher in height than the waterproof sheet protective protrusion member 13. A plurality of members 14 are attached at regular intervals in the circumferential direction. For example, the gap between the outer peripheral surface of the segment 19 assembled in a cylindrical shape and the inner peripheral surface of the tail plate 2 is 50 mm, the thickness of the waterproof sheet 5 is 2 mm, and the thickness of the tail plate 2 and the receiving frame 4 is 30 mm. In this case, the height of the waterproof sheet protective ridge member 13 is 12 mm, and the height of the receiving frame displacement regulating ridge member 14 is 15 mm.
[0020]
Further, when the tail plate 2 and the receiving frame 4 are viewed from the front, the receiving frame displacement restricting ridge member 14 and the waterproof sheet protective ridge member 13 attached to the tail plate 2 as shown in FIG. The receiving frame 4 is rearward from the fixed frame 10 so as to face the inner peripheral surface of the tail plate 2 that is alternately disposed in the direction and whose top surface is exposed between the adjacent waterproof sheet protection protrusion members 13 and 13. Each of the receiving frame displacement regulating ridge members 14 is configured to intervene between the adjacent waterproof sheet protective ridge members 13 and 13 when moved to.
[0021]
Note that the receiving frame displacement regulating ridge member 14 overlaps the waterproof sheet protecting ridge member 13 without necessarily disposing the waterproof sheet protecting ridge member 13 and the receiving frame displacement regulating ridge member 14 alternately in the circumferential direction. What is necessary is just to set it as the structure made to oppose the position of an up-down and left-right with respect to the internal peripheral surface of the tail plate 2 in the position which does not fit. Further, the waterproof sheet protective ridge member 13 and the receiving frame displacement regulating ridge member 14 may be formed of a material having a smooth surface and appropriate hardness in addition to cast nylon resin. For example, it may be formed from a synthetic resin such as polyethylene, polyester, polypropylene, rubber, or synthetic rubber.
[0022]
The specific configuration of the winding device 6 and the welding device 7 disposed in the movable frame 3 will be described. As shown in FIG. 5, the front and rear ends of the outer peripheral surface of the support cylinder portion 3a in the movable frame 3 A pair of front and rear ring-shaped support frames 15a, 15b and 16a, 16b are fixed to each other in a standing state with a small space in the front and rear, and a plurality of support frames 15a, 15b are arranged between the outer peripheral portions of the front support frames 15a, 15b. A first swivel ring 17 rotatably supported by a plurality of rollers (not shown) is provided, and the first swivel ring 17 is received at a small interval inward from the inner peripheral surface of the front end portion of the frame 4. It is configured to rotate in the circumferential direction at a position.
[0023]
The hoisting device 6 projects from the first swivel ring 17 and an appropriate rear surface of the first swivel ring 17 toward the rear in parallel with the length direction of the receiving frame 4 as shown in FIG. The winding arm 18 and a plurality of chuck fittings 21 attached to the winding arm 18 at regular intervals in the length direction, and a belt-like shape having a constant width drawn by the chuck fitting 21. The waterproof sheet 5 is rolled around a winding core, and the front end of the winding core of the winding roll 22 is supported at an appropriate position on the rear surface of the frame portion 10a of the fixed frame 10 to receive the winding roll 22 and the inner peripheral surface of the frame 4 Is fixedly arranged at a predetermined position with a small space between the end and the end of the belt-shaped waterproof sheet 5 is held by the chuck metal fitting 21 and pulled out in the circumferential direction.
[0024]
On the other hand, a second swiveling ring 23 rotatably disposed by a plurality of rollers (not shown) is disposed between the outer peripheral portions of the rear support frames 16a and 16b. The frame 4 is configured to rotate in the circumferential direction at a position with a small gap inward from the inner peripheral surface of the rear end of the receiving frame 4, and the welding device 7 is attached to the second swiveling ring 23 as shown in FIG. ing. The welding device 7 is composed of an electric heating iron 7A and a pressing roller 7B attached to a fixed plate 24 fixed to an appropriate position on the outer peripheral portion of the second swivel ring 23. The electric heating iron 7A is an existing waterproof rolled up in a cylindrical shape. Inserted between the inner peripheral surface of the front end portion of the sheet 5B and the outer peripheral surface of the rear end portion of the newly installed waterproof sheet 5A superposed on the inner peripheral surface of the front end portion to melt these opposing surfaces. The facing surface of the overlapping portion 5C between the newly installed waterproof sheet 5A and the existing waterproof sheet 5B, which are separated by insertion of the iron 7A, is melted by the electrothermal iron 7A, and then joined and integrated with a constant pressure force.
[0025]
The drive means for the first and second swivel rings 17 and 23 are provided with drive motors 31 and 32 on the front and rear portions of the support tube portion 3a of the movable frame 3 as shown in FIG. The pinions 33 and 34 fixed to the rotary shafts 32 and 32 are meshed with the internal gears 35 and 36 formed on the inner peripheral surfaces of the first and second swivel rings 17 and 23, and are driven by the drive motors 31 and 32. Each swivel ring 17, 23 is configured to swivel.
[0026]
The newly installed waterproof sheet 5A wound in a cylindrical shape in contact with the inner peripheral surface of the receiving frame 4 is held in a state of being pressed against the receiving frame 4 by the fixing means 8. As shown in the left half of FIG. 8 and FIG. 9, the fixing means 8 is composed of a plurality of pressing jacks 8 </ b> A fixed to the outer peripheral surface of the support cylinder portion 3 a of the movable frame 3 at a small interval in the circumferential direction. The portion of the inner peripheral surface of the newly installed waterproof sheet 5A, excluding the overlapping portion 5C with the existing waterproof sheet 5B, is pressed against the inner peripheral surface of the frame 4 at the tip of the piston rod of the pressing jack 8A and hangs on the newly installed waterproof sheet 5A The pressing member 8B is fixed so as not to cause such as.
[0027]
On the other hand, the fixing means 9 for fixing the front end portion of the existing waterproof sheet 5B includes a plurality of fixing means fixed to the outer peripheral surface of the rear end portion of the movable frame 3 at small intervals in the circumferential direction as shown in the right half portion of FIG. The pressure jack 9A is composed of a plurality of pressing jacks 9A, and the front end of the existing waterproof sheet 5B is received at the front end of the piston rod of the pressing jack 9A and pressed against the inner peripheral surface of the rear end of the frame 4 to hang on the end of the existing waterproof sheet 5B. The pressing member 9B is fixed so as not to cause the.
[0028]
Next, the operation of each device and means will be described. First, as shown in FIGS. 1 and 10, the movable jack 20 mounted on the fixed frame portion 10a of the fixed frame 10 is extended to house the movable frame 3 in the fixed frame 10, and the movable frame 3 In the rear, the existing waterproofing is made by first winding the front half of the outer peripheral surface of the segment 19 already assembled into a cylindrical shape by an erector (not shown) along the inner peripheral surface of the tail plate 2 in the rear end portion of the tail plate 2. The rear end of the receiving frame 4 is covered with the rear half of the sheet 5B, and the front end of the existing waterproof sheet 5B protruding from the segment 19 is tensioned by the pressing member 9B of the fixing means 9 without dripping or wrinkling. The shield jack 25 is pressed against the inner peripheral surface of the end portion, and the spreader 25a at the tip of the rod is pressed against the front end surface of the segment 19 through a notch provided in the vertical support frame portion 3b of the movable frame 3.
[0029]
In this state, as shown in FIG. 6, the tip of the winding roll 22 of the belt-like waterproof sheet 5 supported in a cantilever manner on the fixed frame 10 side is supported in a cantilever manner on the first turning ring 17. When the first swiveling ring 17 is swung after being gripped by the chuck fitting 21 attached to the hoisting arm 18, the hoisting arm 18 moves in the circumferential direction along the inner peripheral surface of the receiving frame 4, A new waterproof sheet is formed by winding the waterproof sheet 5 in a cylindrical shape on the inner peripheral surface of the frame 4 while pulling the belt-shaped waterproof sheet 5 wound around the winding roll 22 from the winding roll 22 in the circumferential direction. Form 5A.
[0030]
When this new waterproof sheet 5A is formed, the outer peripheral surface of the rear end portion is overlapped with the inner peripheral surface of the front end portion of the existing waterproof sheet 5B received on the inner peripheral surface of the rear end portion of the frame 4 and the inner periphery of the receiving frame 4 After both ends of the newly installed waterproof sheet 5A wound on the surface are overlapped, the winding roll 22 is removed and the newly installed waterproof sheet 5A is received by the pressing members 8B of all the pressing jacks 8A of the fixing means 8. The cylindrical shape is maintained by pressing against the inner peripheral surface of the frame 4.
[0031]
At this time, since the receiving frame 4 is supported by the vertical support frame 3b of the movable frame 3 in a cantilevered manner, the receiving waterproof sheet 5A and the existing waterproof sheet 5B are pressed against the inner peripheral surface of the frame 4. When the pressing members 8B and 9B are pressed by the pressing jacks 8A and 9A of the plurality of fixing means 8 and 9 to be fixed, or the fixing means 8 and 9 are sequentially pressed in accordance with the winding of the waterproof sheet 5. The axial center of the tail plate 2 is displaced in a direction inclined with respect to the axial center of the tail plate 2 from the front end toward the rear end.
[0032]
That is, the portion of the receiving frame 4 that receives a strong pressing force is displaced from the front end toward the rear end toward the tail plate 2 by the strength of the pressing force of the plurality of fixing means 8 and 9, and the pressing force is weaker than the pressing force. The receiving portion is separated from the tail plate 2 and is displaced in a direction in which it is pressed against the outer peripheral surface of the existing waterproof sheet 5B, but a plurality of receiving frame displacement regulating ridge members 14 are fixed in the circumferential direction on the outer peripheral surface of the receiving frame 4. Since it is provided at every interval, when the axis of the receiving frame 4 is tilted and displaced as described above, the receiving frame displacement regulating ridge member 14 is slightly displaced on the side that is displaced to the tail plate 2 side. The receiving frame 4 is prevented from further displacement in contact with the inner peripheral surface of the tail plate 2, and the tail plate 2 is not likely to be damaged by the receiving frame 4. In the side which is displaced to preparative 5B side, thereby preventing damage to the waterproof sheet 5B are prevented from bonding strongly to the existing waterproofing sheet 5B.
[0033]
When the winding of the newly installed waterproof sheet 5A to the inner peripheral surface of the receiving frame 4 is completed, fixing by the fixing means 9 that receives the overlapping portion 5C of the newly installed waterproof sheet 5A and the existing waterproof sheet 5B and presses against the inner peripheral surface of the frame 4 In addition, the electric iron 7A of the welding device 7 is placed in the overlapping portion 5C of the newly installed waterproof sheet 5A and the existing waterproof sheet 5B, that is, the outer peripheral surface of the rear end portion of the newly installed waterproof sheet 5A and the inner peripheral surface of the front end portion of the existing waterproof sheet 5B. As shown in FIG. 7, the second swiveling ring 23 is swung to move the electric heating iron 7A in the circumferential direction to separate the overlapping portion 5C between the newly installed waterproof sheet 5A and the existing waterproof sheet 5B. The spaced facing surfaces are heated and melted.
[0034]
Further, following the movement of the electric heating iron 7A, the inner periphery of the new waterproof sheet 5A on the opposite surface between the newly installed waterproof sheet 5A and the existing waterproof sheet 5B immediately after the pressing roller 7B moves together with the electric heating iron 7A. The surface is pressed against the existing waterproof sheet 5B side, and the sheet facing surface melted by the electric heating iron 7A is polymerized again, and is surely welded completely without causing wrinkles. The overlapping portion 5C of the newly installed waterproof sheet 5A and the existing waterproof sheet 5B is pressed by the pressing member 9B of the fixing means 9.
[0035]
The formation process of the newly installed waterproof sheet 5A wound around the inner peripheral surface of the receiving frame 4, and the welding process of the overlapping portion 5C of the newly installed waterproof sheet 5A and the existing waterproof sheet 5B by the welding apparatus 7 after the formation of the newly installed waterproof sheet 5A, In order to shorten the tunnel construction time, it is performed in parallel with the tunnel excavating machine 1. That is, the shield jack 25 of the tunnel digging machine 1 is extended and digging while taking the propulsion reaction force by the segment 19, and at the same time, the moving jack 20 is extended at the same speed to move from the fixed frame 10 as shown in FIG. The frame 3 is pushed backward.
[0036]
At this time, the receiving frame 4 is tilted with respect to the axis of the tail plate 2 in the same manner as described above by the pressing force of the pressing roller 7B that presses the overlapping portion of the newly installed waterproof sheet 5A and the existing waterproof sheet 5B. However, as described above, the receiving frame displacement restricting protrusion 14 attached to the outer peripheral surface of the receiving frame 4 abuts on and is received by the inner peripheral surface of the tail plate 2, and damage to the tail plate 2 and the existing waterproof sheet 5B. Can be prevented.
[0037]
When the movable frame 3 is housed in the fixed frame 10, the movable frame 3 is attached to the rear end of the receiving frame displacement regulating protrusion 14 attached to the outer peripheral surface of the receiving frame 4 and the inner peripheral surface of the tail plate 2. The front end of the waterproof sheet protection ridge member 13 is opposed with a small gap, but when the movable frame 3 moves rearward, the receiving frame 4 protects the waterproof sheet as shown in FIG. It overlaps with the inner peripheral surface of the rear end of the tail plate 2 to which the ridge member 13 is attached.
[0038]
However, the receiving frame displacement regulating ridge member 14 attached to the receiving frame 4 and the waterproof sheet protective ridge member 13 attached to the tail plate 2 are provided at positions shifted in the circumferential direction so as not to overlap each other. Therefore, as shown in FIGS. 2 (A), 2 (B) and 3, the receiving frame displacement regulating ridge member 14 intervenes in the space between the adjacent waterproof sheet protective ridge members 13 and 13, and the receiving frame displacement regulation is performed. The rear end surface of the ridge member 14 does not collide with the front end surface of the waterproof sheet protective ridge member 13. Further, since the height of the receiving frame displacement restricting ridge member 14 is formed higher than that of the waterproof sheet protective ridge member 13, the waterproof sheet protective ridge member 13 does not contact the outer peripheral surface of the receiving frame 4. . Even when the movable frame 3 is housed in the fixed frame 10, the rear end portion of the receiving frame displacement restricting ridge member 14 is interposed between the front end portions of the waterproof sheet protective ridge members 13 and 13. A structure may be used.
[0039]
Furthermore, the cylindrical existing waterproof sheet 5B covering the segment 19 is attached to the inner peripheral surface of the rear end of the tail plate 2 integrally with the segment 19 in a state where the outer peripheral surface of the segment 19 is covered according to the excavation of the tunnel excavator 1. As shown in FIG. 2 (b), the outer periphery of the tail seal 11 is slidably contacted with the tail seal 11, and the tail plate 2 is fed rearward from the rear end. Even if tilted with respect to the shaft center, the waterproof sheet protective projection member 13 attached to the inner peripheral surface of the tail plate 2 is in sliding contact with the existing waterproof sheet 5B, and the tail seal mounting bracket 12 is in contact with the existing waterproof sheet 5B. It is possible to prevent the existing waterproof sheet 5B from being damaged by the tail seal mounting bracket 12.
[0040]
Thus, after the rear end portion of the newly installed waterproof sheet 5A is integrally connected to the front end portion of the existing waterproof sheet 5B by welding, the inner peripheral surface of the newly installed waterproof sheet 5A and the overlapping portion by the pressing members 8B and 9B of the fixing means 8 and 9 The movable frame 3 in which the winding device 6 and the welding device 7 are disposed is accommodated in the fixed frame 10 by releasing the press against the 5C and then contracting the moving jack 20 as shown in FIG. At the same time, the shield jack 25 is contracted to be separated from the existing segment 19 to the front.
[0041]
Then, a space part in which the segment 19 can be assembled is provided in the newly installed waterproof sheet 5A. In this space part, the new segment 19 protrudes from the existing segment 19 as shown in FIG. Assemble along the inner peripheral surface of these waterproof sheets across the inner peripheral surface of the front half of the existing waterproof sheet 5B and the inner peripheral surface of the rear half of the new waterproof sheet 5A. At this time, the inner peripheral surface of the front end portion of the new waterproof sheet 5A is pressed by the pressing member 9B of the fixing means 9 of the existing waterproof sheet 5B provided at the rear end portion of the movable frame 3 so that the new waterproof sheet 5A does not sag. The waterproof sheet winding roll 22 is set.
[0042]
After the segment 19 is assembled, the shield jack 25 is extended to contact the front end surface of the new segment 19 and further extended to take a reaction force on the new segment 19 and excavate the tunnel excavator 1 at the same time. As described above, the moving jack 20 is extended at the same speed to push the movable frame 3 backward from the fixed frame 10 as described above. Winding work of the newly installed waterproof sheet 5A on the inner peripheral surface of the receiving frame 4 by the device 6, and welding work of the overlapping portion of the newly installed waterproof sheet 5A and the previously wound waterproof sheet 5B by the welding device 7 after winding. The assembly work of the segments 19 is sequentially performed.
[0043]
In the above embodiment, in order to restrict the displacement of the receiving frame 4, a plurality of receiving frame displacement regulating protrusion members 14 are attached to the outer peripheral surface of the receiving frame 4. Without providing the strip member 14, the length of all the waterproof sheet protective projection members 13 'attached to the inner peripheral surface of the tail plate 2 reaches the vicinity of the fixed frame 10 as shown in FIG. It may be formed long toward the front.
[0044]
If configured in this manner, the outer peripheral surface of the waterproof sheet 5B in which the tail seal mounting bracket 12 covers the segment 19 by these waterproof sheet protective protrusions 13 'having a height higher than the tail seal mounting bracket 12 As a matter of course, when the waterproof sheet 5 is wound around the inner peripheral surface of the receiving frame 4 to form the new waterproof sheet 5A, the new waterproof sheet 5A and the existing waterproof sheet 5B When the overlapping portion is welded by the welding device 7, the shaft center of the receiving frame 4 is inclined with respect to the shaft center of the tail plate 2 due to the bias of the waterproof sheet pressing force by the fixing means 8 and 9 and the pressing position of the pressing roller 7B. Even so, the outer peripheral surface of the rear end portion of the receiving frame 4 is received by the top surface of the waterproof sheet protective ridge member 13 and further displacement is prevented, so that the receiving frame 4 comes into contact with the tail plate 2. Can be prevented.
[0045]
However, the purpose of the waterproof sheet protective ridge member 13 is to prevent the existing waterproof sheet 5B from contacting the tail seal mounting bracket 12, and this waterproof sheet protective ridge member 13 also covers the segment 19. Since it is desirable not to contact the existing waterproof sheet 5B, it is preferable that the clearance between the waterproof sheet protective ridge member 13 and the segment 19 has a margin as much as possible. On the other hand, the purpose of the receiving frame displacement restricting ridge member 14 is to prevent contact between the receiving frame 4 and the tail plate 2, and the receiving frame 4 is not inclined as much as possible as a structure. It is desirable to make the gap between the displacement regulating protrusion member 14 and the tail plate 2 as small as possible. Therefore, as shown in FIG. 12, the inner periphery of the tail plate 2 is used as described above in the embodiment, rather than extending the waterproof sheet protective projection member 13 'to the vicinity of the rear end of the fixed frame 10. It is preferable that a displacement regulating ridge member 14 is attached to the outer peripheral surface of the receiving frame 4 separately from the waterproof sheet protective ridge member 13 attached to the surface.
[0046]
【The invention's effect】
As described above, according to the first aspect of the present invention, the tubular waterproof sheet receiving frame disposed along the inner peripheral surface of the tail plate, and the strip covering strip shape in contact with the inner peripheral surface of the receiving frame. Tunnel comprising a winding device that winds up a waterproof sheet in a cylindrical shape while superimposing the rear end portion on the front end portion of the waterproof sheet that has been wound up first, and a welding device that welds the overlapping portions of these waterproof sheets together In the excavator, a plurality of waterproof sheet protective ridge members higher than the height of the tail seal mounting bracket are mounted on the inner peripheral surface of the tail plate at predetermined intervals in the circumferential direction, and the top surfaces of these waterproof sheet protective ridge members Since the outer peripheral surface of the receiving frame is configured to be received by the biasing force of the fixing means that presses the waterproof sheet against the inner peripheral surface of the frame and the pressing roll of the welding device Even if the axis of the receiving frame tilts and displaces with respect to the axis of the tail plate, the receiving frame can be received by the top surface of the tarpaulin protective ridge member with a slight displacement. The frame does not contact the tail plate directly, and damage to the tail plate can be reliably prevented.
[0047]
Furthermore, since the displacement amount of the shaft center of the receiving frame can be regulated to be extremely small, the work of winding the waterproof sheet around the inner peripheral surface of the receiving frame or the newly installed waterproof sheet and the existing waterproof sheet It is possible to smoothly and accurately perform the welding operation of the overlapping portion.
[0048]
Further, since the above-mentioned waterproof sheet protective projection member is formed higher than the height of the tail seal mounting bracket, the tail seal mounting bracket prevents the tail seal mounting bracket from slidingly contacting the cylindrical waterproof sheet covering the segment. It is possible to prevent the waterproof sheet from being damaged by the seal mounting bracket.
[0049]
According to the invention according to claim 2, while attaching a plurality of waterproof sheet protective ridge members higher than the height of the tail seal mounting bracket to the inner peripheral surface of the tail plate of the tunnel machine at predetermined intervals in the circumferential direction, A receiving frame displacement restricting ridge member higher than the height of the waterproof sheet protective ridge member on the outer peripheral surface of the waterproof sheet receiving frame is circumferentially directed toward the inner peripheral surface of the tail plate not provided with the waterproof sheet protective ridge member. Since the waterproof sheet protective projection member prevents the tail seal mounting bracket from sliding on the waterproof sheet, the waterproof sheet can be prevented from being damaged. Even if the seat receiving frame is inclined with respect to the axis of the tail plate due to the bias of the pressing force of the welding device pressing roll or waterproof sheet fixing means, It is possible to reliably prevent the top portion of the rim displacement regulating ridge member from slidingly contacting the inner peripheral surface of the tail plate and causing the receiving frame to directly contact the tail plate or to collide with the waterproof sheet protective ridge member. .
[0050]
Further, the tarpaulin protective ridge member attached to the outer peripheral surface of the receiving frame and the receiving frame displacement regulating ridge member attached to the inner peripheral surface of the tail plate are shifted in the circumferential direction so as not to overlap each other. Since the rear end surface of the receiving frame displacement regulating ridge member does not collide with the front end surface of the waterproof sheet protective ridge member, the receiving frame is surely fitted to the tail plate while interposing between adjacent waterproof sheet protective ridge members. Further, since the height of the receiving frame displacement regulating ridge member is higher than that of the waterproof sheet protective ridge member, the waterproof sheet protective ridge member can be moved to the receiving frame. 4 and the displacement of the shaft center of the receiving frame can be suppressed to a minimum, and the waterproof sheet with respect to the inner peripheral surface of the receiving frame The welding operation of the polymerization unit with can stand the work and take-erected new tarps and the existing waterproof sheet can be carried out more smoothly and accurately, it can wrinkle or the like waterproof sheet prevents as much as possible from occurring.
[Brief description of the drawings]
FIG. 1 is a simplified longitudinal side view of an entire tunnel excavator,
FIGS. 2A and 2B are enlarged vertical side views of the tail plate lower peripheral side showing the movement state of the waterproof sheet protection ridge member and the receiving frame displacement regulating ridge member from the start to the end of the excavation; Figures, (c) and (d) are enlarged vertical side views of the lower part of the tail plate, showing the assembled state of the segment and the waterproof sheet after the receiving frame has advanced,
FIG. 3 is a partial longitudinal front view showing an arrangement state of a waterproof sheet protective ridge member and a receiving frame displacement regulating ridge member;
FIG. 4 is an enlarged vertical sectional side view of a part thereof,
FIG. 5 is a simplified longitudinal side view of a movable frame portion equipped with a winding device and a welding device;
FIG. 6 is a perspective view of a winding device portion;
FIG. 7 is an enlarged vertical front view of a receiving frame part that is being welded;
FIG. 8 is a simplified longitudinal front view of a tail plate portion equipped with fixing means;
FIG. 9 is a simplified longitudinal sectional side view of a movable frame portion equipped with fixing means;
FIG. 10 is a simplified vertical side view of a state in which a movable frame is housed in a fixed frame;
FIG. 11 is a simplified vertical side view of the movable frame pushed out from the fixed frame;
FIG. 12 is a partially enlarged vertical side view showing another displacement prevention device for a waterproof sheet receiving frame of the present invention.
[Explanation of symbols]
1 tunnel machine
2 Tail plate
3 movable frame
4 receiving frame
5 Tarpaulin
5A new tarpaulin
5B Existing tarpaulin
5C superposition part
6 Winding device
7 Welding equipment
8, 9 Fixing means
10 Fixed frame
13 Tarpaulin member
14 Receiving frame displacement regulating ridge member

Claims

A cylindrical tarpaulin receiving frame disposed along the inner peripheral surface of the tail plate, and a front end portion of the tarpaulin where the strip-shaped tarpaulin for covering the segment is wound up in contact with the inner peripheral surface of the receiving frame. A tail seal is attached to the inner peripheral surface of the tail plate in a tunneling machine equipped with a winding device that winds the end portion in a cylindrical shape while superposing the ends, and a welding device that welds the overlapping portions of these waterproof sheets together. A plurality of waterproof sheet protective ridge members that are higher than the height of the metal fittings are attached at predetermined intervals in the circumferential direction, and the outer peripheral surface of the receiving frame is received by the top surface of these waterproof sheet protective ridge members. An apparatus for preventing displacement of a waterproof sheet receiving frame in a tunnel digging machine.

A cylindrical tarpaulin receiving frame disposed along the inner peripheral surface of the tail plate, and a front end portion of the tarpaulin where the strip-shaped tarpaulin for covering the segment is wound up in contact with the inner peripheral surface of the receiving frame. A tail seal is attached to the inner peripheral surface of the tail plate in a tunneling machine equipped with a winding device that winds the end portion in a cylindrical shape while superposing the ends, and a welding device that welds the overlapping portions of these waterproof sheets together. While mounting a plurality of tarpaulin protective ridge members that are higher than the height of the metal fittings at predetermined intervals in the circumferential direction, the receiving frame displacement restriction that is higher than the height of the tarpaulin protective ridge members on the outer peripheral surface of the tarpaulin receiving frame. A tunnel characterized in that ridge members are attached at predetermined intervals in the circumferential direction toward the inner peripheral surface of the tail plate not provided with the waterproof sheet protective ridge member. Displacement preventing device tarpaulin support frame in advance machines.