JP3783951B2

JP3783951B2 - Shield machine capable of branch start and branch shield machine method

Info

Publication number: JP3783951B2
Application number: JP2002310865A
Authority: JP
Inventors: 光雄清水; 安美佐藤
Original assignee: Kawasaki Jukogyo KK
Current assignee: Kawasaki Motors Ltd
Priority date: 2002-10-25
Filing date: 2002-10-25
Publication date: 2006-06-07
Anticipated expiration: 2022-10-25
Also published as: JP2004143827A

Description

【０００１】
【発明の属する技術分野】
本発明は分岐発進可能なシールド掘進機及び分岐シールド掘進方法に関し、特に、本線トンネルをカーブ状に掘進可能なシールド掘進機から分岐シールド掘進機を分岐発進させるようにした技術に関する。
【０００２】
【従来の技術】
従来、トンネルのシールド工法において、内面がセグメントで覆工された本線トンネルとその本線トンネルから分岐する分岐トンネルとを構築する場合、シールド掘進機で本線トンネルを掘進していき、分岐地点においてシールド掘進機から分岐シールド掘進機を分岐発進させ、その分岐シールド掘進機で分岐トンネルを掘進していく技術が知られている。
この分岐発進技術に用いるシールド掘進機として、分岐発進用の発進口が形成された内胴と、この内胴に前後にスライド可能に外嵌された外胴と、内胴に支持されたカッターディスクと、内胴の後端部に取り付けられた複数のシールドジャッキとを備えたものが実用に供されている（例えば、特許文献１参照）。
【０００３】
このシールド掘進機で本線トンネルを掘進する場合は、内胴と外胴とを一体的に連結した状態で行い、分岐シールド掘進機を分岐発進させる場合には、先ず、分岐地点の手前でシールド掘進機の掘進を停止させる。次に、外胴の内面に組み付けたセグメントに外胴を固定すると共に、内胴と外胴との連結を解除し、複数のシールドジャッキで内胴を分岐地点まで推進させる。その際、外胴が残置して前記発進口が開口し、その後、発進口から分岐シールド掘進機を発進させる。
【０００４】
また、本願出願人は、カッターディスクが支持された前胴と、エレクタ装置が装備された後胴と、これら前胴と後胴とを中折れ可能に連結する中折れ部とを有し、トンネルをカーブ状に掘進可能な種々のシールド掘進機を実用化している（例えば、特許文献２参照）。このようなシールド掘進機では、後胴に複数のシールドジャッキが取り付けられ、これらシールドジャッキの反力を後胴の内面に組み付けたセグメントでとって、シールド掘進機を推進させる。
【０００５】
【特許文献１】
特許第３２６８３４２号公報
【特許文献２】
特開２００１−２０６６０号公報
【０００６】
【発明が解決しようとする課題】
特許文献１のようなシールド掘進機は、胴部材が中折れ可能になっていないため、本線トンネルをカーブ状に掘進することはできず汎用性に非常に劣るものとなる。この種の分岐発進可能なシールド掘進機は、一般に、トンネルを直進状に掘進するシールド掘進機に適用するものとして実用に供されており、胴部材を中折れ可能に構成する困難性は大きい。
分岐発進可能なシールド掘進機の胴部材を、特許文献２のように中折れ可能に構成しようとした場合、内胴が内嵌された外胴に後続するように、エレクタ装置を装備した後胴を中折れ可能に連結することが考えられる。しかし、複数のシールドジャッキの取り付け位置が問題となる。
【０００７】
先ず、複数のシールドジャッキを後胴に取り付けることが考えれる。この場合、後胴に取り付けた複数のシールドジャッキを用いて、従来通りシールド掘進機を推進させることができるが、シールドジャッキによる推力を内胴に伝達する構成となっていないため、発進口を開口させるために外胴に対して内胴を推進させることが不可能になる。そこで、複数のシールドジャッキを内胴に取り付けることが考えられる。しかし、後胴に対して首振りされる内胴に複数のシールドジャッキを取り付けると、複数のシールドジャッキの反力を後胴の内面に組み付けたセグメントでとって推力を均等に発生させることが難しい場合が想定され、シールド掘進機を確実且つ円滑に推進させることや、発進口を開口させるために外胴に対して内胴を確実且つ円滑に推進させることができないという虞がある。
【０００８】
しかも、複数のシールドジャッキの出力部をセグメントに接近させるようにして、後胴の前側に位置する内胴に複数のシールドジャッキを取り付けるためには、各シールドジャッキの長さが大型化したり、各シールドジャッキを内胴に連結する大がかりな連結部材が必要になり、結局、複数のシールドジャッキの取り付けに無理が生じる。
本発明の目的は、分岐発進可能なシールド掘進機及び分岐シールド掘進方法において、シールド掘進機で本線トンネルをカーブ状に掘進可能にすると共に、複数のシールドジャッキを用いて、シールド掘進機を確実且つ円滑に推進させ、しかも、発進口を形成した内胴を確実且つ円滑に推進させて発進口を開口させ、その発進口から分岐シールド掘進機を分岐発進させること、等である。
【０００９】
【課題を解決するための手段】
請求項１の分岐発進可能なシールド掘進機は、シールド掘進機で本線トンネルを掘進していき、分岐地点においてシールド掘進機から分岐シールド掘進機を分岐発進させる分岐発進可能なシールド掘進機において、前記分岐シールド掘進機の分岐発進用の発進口が形成された内胴と、この内胴に前後にスライド可能に外嵌された外胴と、前記内胴を外胴に内嵌させた状態で外胴と内胴とを一体的に且つ連結解除可能に連結する第１連結部材とを設け、この外胴に後続するように設けられた後胴と、外胴と後胴とを中折れ可能に連結する中折れ部とを備え、前記後胴は、第１後胴と、この第１後胴の前端部分にスライド可能に内嵌された第２後胴とを有し、第１後胴と第２後胴とを一体的に且つ連結解除可能に連結する第２連結部材を設け、前記第２後胴には複数のシールドジャッキが取り付けられ、分岐シールド掘進機発進時、前記第１連結部材及び第２連結部材による連結を解除し、複数のシールドジャッキを用いて、残置される外胴及び第１後胴に対して、第３連結部材によって一体的に連結された内胴及び第２後胴を一体的に推進させて、前記発進口を開口させるように構成したことを特徴とするものである。
【００１０】
このシールド掘進機では、内胴に分岐シールド掘進機の分岐発進用の発進口が形成され、この内胴に外胴が前後にスライド可能に外嵌され、この外胴に後続するように後胴が中折れ部を介して外胴に連結されている。それ故、シールド掘進機により本線トンネルをカーブ状に掘進することが可能になる。
前記後胴は、第１後胴と、この第１後胴の前端部分にスライド可能に内嵌されたジャッキ取付部材としての第２後胴とを有し、前記第２後胴に複数のシールドジャッキが取り付けられている。それ故、内胴と外胴とが第１連結部材で一体的に連結され、また、第１後胴と第２後胴とが第２連結部材で一体的に連結された状態で、複数のシールドジャッキが作動してシールド掘進機が推進する。
【００１１】
分岐地点においてシールド掘進機から分岐シールド掘進機を分岐発進させる場合には、内胴と外胴との連結（第１連結部材による連結）と第１後胴と第２後胴との連結（第２連結部材による連結）が解除され、また、内胴と第２後胴とが第３連結部材で一体的に連結された状態で、複数のシールドジャッキが作動することにより、その推力が内胴に伝達されて、外胴及び第１後胴に対して第３連結部材で連結された内胴及び第２後胴が一体的に前方へ推進されて発進口が開口する。そして、その発進口から分岐シールド掘進機が分岐発進される。
【００１２】
請求項２の分岐発進可能なシールド掘進機は、シールド掘進機で本線トンネルを掘進していき、分岐地点においてシールド掘進機から分岐シールド掘進機を分岐発進させる分岐発進可能なシールド掘進機において、カッターディスクを支持する前胴と、この前胴に後続するように前胴に一体的に連結され且つ分岐シールド掘進機の分岐発進用の発進口が形成された内胴と、この内胴に前後にスライド可能に外嵌された外胴と、この外胴に後続するように設けられ且つエレクタ装置が装備された後胴と、外胴と後胴とを中折れ可能に連結する中折れ部と、内胴の前後両端付近で外胴と内胴の間を止水する止水シールとを備え、前記後胴は、後端部にテールシールが取り付けられた第１後胴と、この第１後胴の前端部分に前後にスライド可能に内嵌される第２後胴とを有し、前記第２後胴に取り付けられた複数のシールドジャッキと、前記内胴を外胴に内嵌させた状態で外胴と内胴とを一体的に且つ連結解除可能に連結する第１連結部材と、第１後胴と第２後胴とを一体的に且つ連結解除可能に連結する第２連結部材とを設け、前記第１，第２連結部材による連結を解除した状態で、複数のシールドジャッキを用いて、残置される外胴及び第１後胴に対して第３連結部材により一体的に連結された内胴及び第２後胴を一体的に推進させて前記発進口を開口させるように構成したことを特徴とするものである。
【００１３】
このシールド掘進機においては、基本的に、請求項１のシールド掘進機で説明した作用とほぼ同様の作用を奏する。その他の作用を追加的に説明する。このシールド掘進機では、カッターディスクを支持する前胴に後続するように内胴が前胴に一体的に連結され、後胴にエレクタ装置が装備され、内胴の前後両端付近で外胴と内胴の間を止水する止水シールが設けられている。
【００１４】
シールド掘進機で本線トンネルを掘進する場合、エレクタ装置により第１後胴の内面にセグメントが組み付けられ、そのセグメントで本線トンネルが覆工される。第１後胴の内面に組み付けられたセグメントで複数のシールドジャッキの反力をとってシールド掘進機が推進し、カッターディスクにより前方の地山が掘削され本線トンネルが形成されていく。その際、止水シールでシールされた内胴と外胴の間から水や土がシールド掘進機内に侵入することが防止される。
【００１５】
分岐地点においてシールド掘進機から分岐シールド掘進機を分岐発進させる場合、第１後胴の内面に組み付けられたセグメントで複数のシールドジャッキの反力をとって、外胴及び第１後胴に対して前胴と共に内胴及び第２後胴が一体的に前方へ推進されて発進口が開口する。ここで、第１後胴に対して第２後胴と共に複数のシールドジャッキも推進し、シールドジャッキとセグメント間の間隔が大きくなっていくが、適宜、シールドジャッキとセグメント間に仮セグメントを組み付けたり反力受け部材を挿入することにより、複数のシールドジャッキによる推力を確実に発生させる。発進口が開口しても、外胴の前端部に内胴の後端部を内嵌させた状態にして、これらの間が止水シールによりシールされ、内胴と外胴の間から水や土がシールド掘進機内に侵入することが防止される。
【００１６】
請求項３の分岐発進可能なシールド掘進機は、請求項２の発明において、第１後胴とこの第１後胴の内面に組み付けたセグメントとを連結する第４連結部材を設けたことを特徴とするものである。
請求項４の分岐発進可能なシールド掘進機は、請求項２又は３の発明において、前記第２後胴の外径は外胴の内径未満であり、前記第２後胴には、第２後胴内に待機させた位置と第２後胴外へ突出させた位置とに亙って進退可能な複数の後胴支持部材が装着され、前記外胴及び第１後胴に対して内胴及び第２後胴を推進させた際、第２後胴外へ突出させた複数の後胴支持部材を介して、外胴に対して隙間が生じた状態の第２後胴を支持することを特徴とするものである。
【００１７】
第２後胴の外径は外胴の内径未満であるため、第１後胴の前端部分に、外胴に中折れ可能に内嵌される中折れ部を形成すると共に、この中折れ部に第２後胴を前後にスライド可能に内嵌させることができる。外胴に対して第２後胴が推進して外胴の内側に位置すると、第２後胴と外胴との間に隙間が生じるが、第２後胴に装着された複数の後胴支持部材が第２後胴外へ突出され、これら後胴支持部材によって、外胴に対して隙間が生じた状態の第２後胴が支持される。
【００１８】
請求項５の分岐シールド掘進方法は、請求項２に記載のシールド掘進機を用いる分岐シールド掘進方法において、前記内胴を外胴に内嵌させた状態で外胴と内胴とを第１連結部材で一体的に且つ連結解除可能に連結してシールド掘進機を掘進させ、分岐地点の手前に到達したときにシールド掘進機の掘進を停止させる第１工程と、前記第１，第２連結部材による連結を解除して、複数のシールドジャッキを用いて、残置される外胴及び第１後胴に対して第３連結部材により一体的に連結された内胴及び第２後胴を分岐地点まで一体的に推進させて前記発進口を開口させる第２工程と、前記発進口から分岐シールド掘進機を分岐発進させる第３工程とを備えたことを特徴とするものである。
【００１９】
この分岐シールド掘進方法においては、第１工程において、内胴を外胴に内嵌させた状態で外胴と内胴とを第１連結部材で一体的に且つ連結解除可能に連結してシールド掘進機を掘進させ、分岐地点の手前に到達したときにシールド掘進機の掘進を停止させる。次に、第２工程において、第１，第２連結部材による連結を解除して、複数のシールドジャッキを用いて、残置される外胴及び第１後胴に対して第３連結部材で連結された内胴及び第２後胴を分岐地点まで一体的に推進させて発進口を開口させる。その後、第３工程において、発進口から分岐シールド掘進機を分岐発進させる。この分岐シールド掘進方法では、基本的に請求項１と同様の作用を奏する。
【００２０】
請求項６の分岐シールド掘進方法は、請求項５の発明において、請求項２に記載のシールド掘進機に換えて請求項３に記載のシールド掘進機を用いる分岐シールド掘進方法であって、前記第２工程において、外胴及び第１後胴に対して内胴及び第２後胴を推進させる前に、第１後胴と第１後胴の内面に組み付けたセグメントとを第４連結部材で連結しておくことを特徴とするものである。
【００２１】
第２工程において、第１後胴と第１後胴の内面に組み付けたセグメントとを第４連結部材で連結することにより、複数のシールドジャッキによる推力が第２後胴、内胴、前胴に伝達されて、外胴及び第１後胴に対して前胴と共に内胴及び第２後胴が推進する。
【００２２】
請求項７の分岐シールド掘進方法は、請求項５の発明において、請求項２に記載のシールド掘進機に換えて請求項４に記載のシールド掘進機を用いる分岐シールド掘進方法であって、前記第２工程において、前記外胴及び第１後胴に対して内胴及び第２後胴を推進させた際、第２後胴に装着された複数の後胴支持部材を第２後胴外へ突出させ、これら後胴支持部材を介して、外胴に対して隙間が生じた状態の第２後胴を支持することを特徴とするものである。
【００２３】
第２工程において、外胴及び第１後胴に対して内胴及び第２後胴を推進させると、第２後胴が外胴の内側に位置し、この第２後胴と外胴との間に隙間が生じるが、その際、第２後胴に装着された複数の後胴支持部材を第２後胴外へ突出させて、これら後胴支持部材を介して、外胴に対して隙間が生じた状態の第２後胴を支持する。
【００２４】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照しながら説明する。本実施形態は、シールド掘進機で本線トンネルを掘進していき、分岐地点においてシールド掘進機から分岐シールド掘進機を分岐発進させる、分岐発進可能な泥水式のシールド掘進機、及び、分岐シールド掘進方法に、本発明を適用した場合の一例である。
【００２５】
先ず、シールド掘進機１Ａについて説明する。
図１〜図３に示すように、シールド掘進機１Ａは、前胴２と、前胴２に後続する中胴３と、中胴３に後続する後胴４と、中胴３と後胴４とを中折れ可能に連結する中折れ部５とを有し、前胴２にカッターディスク１０が支持され、後胴４にテールシール５０とエレクタ装置７０とが装備されている。
【００２６】
カッターディスク１０は、中央部１１、中央部１１から外側へ放射状に延びる複数のカッタースポーク１２、中央部１１の前面に取り付けられたセンターカッター１３、複数のカッタースポーク１２の前面に取り付けられた多数のカッタービット１４を有する。尚、１又は複数のカッタースポーク１２の外周付近には、曲進時に余掘りするコピーカッター（図示略）も設けられている。
【００２７】
カッターディスク１０の後面には、後方へ延びる複数の支持部材１５が固定され、これら支持部材１５の後端部に回動支持リング１６が固定され、この回動支持リング１６の後端部にリングギヤ１７が固定されている。コピーカッターを駆動する油圧を供給するために、中央部１１には供給通路部材１８が接続されて後方へ延びている。
【００２８】
前胴２の内面には前後に環状体２０が固定され、この環状体２０の後端部から内側へ張出した取付板２１の前側に、円板状の隔壁２２の外周部分が連結材２３を介して連結されている。環状体２０の内面と隔壁２２の外周部に連結されたリング材２４との間に、回動支持リング１６が摺動自在に嵌合されて、カッターディスク１０が回動自在に支持されている。回動支持リング１６と環状体２０及びリング材２４の間は夫々環状シール部材２５，２６でシールされている。
【００２９】
前記取付板２１には複数の油圧モータ２７が前向きに取り付けられ、これら油圧モータ２６で夫々駆動される複数の駆動ギヤ２７ａがリングギヤ１７の内側の歯に噛合し、これら油圧モータ２６が同期駆動されて、リングギヤ１７と共にカッターディスク１０が回動される。供給通路部材１８は隔壁２２連結され、同じくこの隔壁２２に後側から連結されたスイベルジョント２８に接続されている。
【００３０】
前胴２の前端部、環状体２０、回動支持リング１６、リング材２４、隔壁２２で囲まれた部分が、カッターディスク１０で掘削された土砂を回収するチャンバー３０に形成されている。チャンバー３０に回収された土砂を泥水にするために水を供給する送水管３１と、チャンバー３０内の泥水を排出する排泥管３２が配設され、送水管３１の先端部は環状体２０を挿通してチャンバー３０の上端部に達し、排泥管３２の先端部は環状体２０を挿通してチャンバー３０の下端部に達している。カッターディスク１０の後面にはチャンバー３０内の掘削土と水とを攪拌する複数の攪拌羽根２９が設けられている。
【００３１】
中胴３は、前胴２に後続するように前胴２に一体的に連結され且つ分岐シールド掘進機１Ｂの分岐発進用の発進口４０が形成された内胴６と、内胴６に前後にスライド可能に外嵌された外胴７とを有する。発進口４０の周囲にはリング部材４０ａが予め溶接により固定されている。前胴２の後端部に固定的に設けられた環状のブラケット３５と、内胴６の前端部に固定的に設けられた環状のブラケット４１とが、複数の接合ボルトで結合されている。
【００３２】
外胴７は前胴２の約２倍の前後長を有し、内胴６は外胴７よりも少し短い前後長を有し、外胴７の外径と前胴２の外径は同じである。前胴２の後端に外胴７の前端が近接し、内胴６の全部が外胴７に内嵌された状態で、外胴７と内胴６とを一体的に且つ連結解除可能に連結する第１連結部材８０と、内胴６の前後両端付近で外胴７と内胴６の間を止水する止水シール４３，４４が設けられている。
第１連結部材８０は複数個（例えば、１０個）設けられ、周方向に略等間隔に配設されて、内胴６の後端部に固定的に設けられた環状のブラケット４５の後面と外胴７との内面に溶接される。内胴６の前後両端部に環状溝が形成され、これら環状溝に止水シール４３，４４が夫々装着されている。
【００３３】
後胴４は、後端部にテールシール５０が取り付けられた第１後胴８と、第１後胴８の前端部分に前後にスライド可能に内嵌される第２後胴９（筒状のジャッキ取付部材）とを有しこの第２後胴９にリングウェブ５３を介して複数のシールドジャッキ５１が後方に向けて周方向に等間隔に配設されて取り付けられている。
第１後胴８の前端部分に外面湾曲状の中折れ部５が形成され、この中折れ部５が外胴７の後端部に中折れ可能に内嵌されている。中折れ部５と外胴７の後端部の間は環状シール５２でシールされている。
【００３４】
第１後胴８の中折れ部５と、この中折れ部５に内嵌される第２後胴９は同じ前後長を有し、第２後胴９の外径は外胴７の内径未満である。第２後胴９の後端部内面にリングウェブ５３が固定的に設けられ、このリングウェブ５３に複数のシールドジャッキ５１のシリンダ本体の端部が挿通状に連結されている。第２後胴９が中折れ部５に内嵌された状態で、第１後胴８と第２後胴９とを一体的に且つ連結解除可能に連結する第２連結部材８１が設けられている。第２連結部材８１は複数個（例えば、１０個）設けられ、周方向に略等間隔に配設されて、第２後胴９に固定したリングウェブ５３の後面と第１後胴８の内面に溶接される。
【００３５】
ここで、内胴６の内側に複数の中折れジャッキ５５が前後方向向きに配設されている。これら中折れジャッキ５５は、本線トンネルＴＡをカーブ状に掘進させるために、後胴４に対して前胴２及び中胴３を首振りさせる為のものであり、各中折れジャッキ５５に連結された前推力伝達管５６の前端部が内胴６の前端部のブラケット４１に固定され、各中折れジャッキ５５に連結された後推力伝達管５７の後端部が第２後胴９のリングウェブ５３に固定されている。
【００３６】
また、第２後胴９には、第２後胴９内に待機させた位置と第２後胴９外へ突出させた位置とに亙って進退可能な複数（例えば、１０個）の後胴支持部材６０が周方向に等間隔に配設されて装着されている。各後胴支持部材６０は筒状の収容部材６１に収容され、この収容部材６１の先端部が第２後胴９に形成された穴に内嵌され溶接されている。後胴支持部材６０には操作部材６２が連結されている。この操作部材６２は第２後胴９の内側から操作可能に設けられ、この操作部材６２を操作することにより、後胴支持部材６０を第２後胴９内に待機させた位置と第２後胴９外へ突出させた位置とに亙って切り換えることができる。
【００３７】
後胴４に装備されたエレクタ装置７０は、後胴４に固定されたリングウェブ６５に、複数のローラを介して回転可能に支持され油圧モータ（図示略）で回動されるエレクタドラム７１と、このエレクタドラム７１に装備されたエレクタ本体７２とを有する。このエレクタ装置７０により、後胴４の内面において複数のセグメントＳがリング状に組み付けられ、そのセグメントＳを複数のシールドジャッキ５１の出力部に連結のスプレッダ５１ａが後方へ押すことにより、そのセグメントＳで複数のシールドジャッキ５１の反力がとられて、シールド掘進機１Ａが推進する。
【００３８】
次に、以上説明したシールド掘進機１Ａで本線トンネルＴＡを掘進していき、分岐地点においてシールド掘進機１Ａから分岐シールド掘進機１Ｂを分岐発進させる分岐シールド掘進方法について、図４〜図７に基づいて説明する。
【００３９】
このシールド掘進機１Ａを用いた分岐シールド掘進方法においては、先ず、内胴６を外胴７に内嵌させた状態で外胴７と内胴６を複数の第１連結部材８０で一体的に且つ連結解除可能に連結すると共に、第１後胴８の前端部分（中折れ部５）に第２後胴９を内嵌させた状態で第１後胴８と第２後胴９とを複数の第２連結部材８１で一体的に且つ連結解除可能に連結して、シールド掘進機１Ａを掘進させ、分岐地点の手前に到達したときにシールド掘進機１Ａの掘進を停止させる（第１工程）。このシールド掘進機１Ａの停止時にエレクタ装置７０により最後に組み付けられた１リング分のセグメントＳはスチール製のセグメントである。
【００４０】
次に、送水管３１、排泥管３２、エレクタ装置７０を除去すると共に、この後僅かに前方の地山を掘削するために送排泥ホース（図示略）を接続する。その後、図４に示すように、発進口４０及びその付近のシールドジャッキ５１と中折れジャッキ５５及び推力伝達管５６，５７を除去してから、内面部分に環状の１対のチューブシール７６が装着されたエントランスリング７５を中胴３内に搬入し、そのエントランスリング７５の先端部を発進口４０の周囲に予め固定されたリング部材４０ａに内嵌させて溶接する。
【００４１】
続いて、分岐発進可能なシールド掘進機１Ｂのカッターディスク９０を支持した前胴９１をエントランスリング７５に挿入してセットし、この前胴９１を反力受け部材７７，７８でエントランスリング７５に固定する。次に、組み付けられたスチール製のセグメンＳの前面にリング状態の第４連結部材８３を当接させた状態で、その第４連結部材８３を第１後胴８の内面に溶接すると共に、セグメンＳにも溶接する。その後、エントランスリング７５のチューブシール７６を作動させ、分岐シールド掘進機１Ｂのカッターディスク９０及び前胴９１とエントランスリング７５の間をシールしてから、エントランスリング７５内において前胴９１の前側のチャンバーを含む空間に、所定の泥水注入装置（図示略）により高濃度の泥水を注入して、発進口４０の開口に備える。
【００４２】
次に、図５に示すように、前述のように第１後胴８と第１後胴８の内面に組み付けたセグメントＳとを第４連結部材８３で連結し、内胴６と第２後胴９とを複数（例えば、１０個）の第３連結部材８２で連結し、更に、第１後胴９の中折れ部５と外胴７とを溶接してから、第１連結部材８０による外胴７と内胴６との連結を解除し、第２連結部材８１による第１後胴８と第２後胴９との連結を解除し、この状態で、複数のシールドジャッキ５１を用いて、外胴７及び第１後胴８に対してカッターディスク１０及び前胴２及び内胴６及び第２後胴９を分岐地点まで一体的に推進させて発進口４０を開口させる（第２工程）。
【００４３】
この外胴７及び第１後胴８に対するカッターディスク１０及び前胴２及び内胴６及び第２後胴９の推進については、先ず、複数のシールドジャッキ５１の反力をエレクタ装置７０により最後に組み付けたセグメントＳでとって行い、その後は、特殊セグメントＳａを第１後胴８及び外胴７の内面に組み立てながら、その特殊セグメントＳａで複数のシールドジャッキ５１の反力をとって行う。
【００４４】
ここで、内胴６が外胴７に対して推進すると、内胴６の外面側には外胴７分の隙間が生じるため、この内胴６の推進と共に又は内胴６の推進完了後に、その隙間に注入管６９から裏込材を注入して隙間を埋める。また、第１後胴８に対して第２後胴９が推進すると、その第２後胴９は外胴７の内側に位置し、第２後胴９と外胴７の間に隙間が生じるため、この第２後胴９の推進途中時又は推進完了後に、複数の操作部材６２を操作して、複数の後胴支持部材６０を第２後胴９外へ突出させ、これら後胴支持部材６０によって、外胴７に対して隙間が生じた状態の第２後胴９を支持する。
【００４５】
次に、発進口４０が開口させた後に、外胴７の内面に組み付けた特殊セグメントＳａと第２後胴９との間に複数の反力受け部材８５を挿入するように、これら反力受け部材８５を外胴７の内面に配設（固定）してから、残りの複数のシールドジャッキ５１等を除去する。次に、図６に示すように、内胴６の発進口４０と反対側の内面に反力壁９５を取り付け、反力受け部材７７，７８によるエントランスリング７５と前胴９１との連結を解除し、その状態で、分岐シールド掘進機１Ｂの前胴９１に装備した複数のシールドジャッキ９２の反力を、反力壁９５、仮セグメント９６でとって分岐シールド掘進機１Ｂを推進させ、開口した発進口４０から分岐発進させる（第３工程）。
【００４６】
前胴９１の後端がエントランスリング７５のチューブシール７６付近に達した状態で、分岐シールド掘進機１Ｂの推進を停止させてから、前胴９１とエントランスリング７５を反力受け部材７７，７８で再度連結して、仮セグメント９６を除去してから、図７に示すように、分岐シールド掘進機１Ｂの後胴９３を搬入して前胴９１に連結する。その後、反力受け部材７７，７８によるエントランスリング７５と前胴９１との連結を解除し、複数のシールドジャッキ９２の反力を、反力壁９５、仮セグメント９６でとって分岐シールド掘進機１Ｂを推進させ、分岐トンネルＴＢを掘進していく。
【００４７】
以上説明した分岐発進可能なシールド掘進機１Ａ、及び、このシールド掘進機１Ａを用いて行う分岐シールド掘進方法の作用・効果について説明する。
中胴３の外胴７と第１後胴８とを中折れ可能に連結しているため、本線トンネルＴＡをカーブ状に掘進することができ、しかも、分岐地点において分岐シールド掘進機１Ｂを分岐発進させ、その分岐シールド掘進機１Ｂで分岐トンネルＴＢを掘進できるため、汎用性に非常に優れたものになる。
【００４８】
第１後胴８の前端部分に第２後胴９を前後にスライド可能に内嵌させ、この第２後胴９に複数のシールドジャッキ５１を取り付けたので、複数のシールドジャッキ５１を、その出力部であるスプレッダ５１ａを第１後胴８の内面に組み付けたセグメントＳに接近させて後胴４に固定的に簡単に取り付けることができる。それ故、中胴３の内胴６と外胴７とを複数の第１連結部材８０で一体的に連結し、また、第１後胴８と第２後胴９とを複数の第２連結部材８１で一体的に連結した状態で、複数のシールドジャッキ５１を作動させることにより、これらシールドジャッキ５１の反力をセグメントＳでとって推力を均等に発生させ、シールド掘進機１Ａを確実且つ円滑に推進させることができる。
【００４９】
分岐地点においてシールド掘進機１Ａから分岐シールド掘進機１Ｂを分岐発進させる場合には、第１連結部材８０による内胴６と外胴７との連結と、第２連結部材８１による第１後胴８と第２後胴９との連結を解除し、また、内胴６と第２後胴９とを複数の第３連結部材８２で一体的に連結し、第１後胴８とセグメントＳとを第４連結部材８３で一体的に連結した状態で、複数のシールドジャッキ５１を作動させることにより、その推力を均一に発生させ内胴６に伝達して、外胴７及び第１後胴８に対して前胴２及び内胴６及び第２後胴９を一体的に確実且つ円滑に推進させて発進口４０を開口させ、その発進口４０から分岐シールド掘進機１Ｂを分岐発進させることができる。
【００５０】
シールド掘進機１Ａにより本線トンネルＴＡを掘進可能な状態で、内胴６の前後両端付近で外胴７と内胴６の間を止水する止水シール４３，４４を設けたので、内胴６を外胴７に内嵌させた状態で、これら内胴６と外胴７の間から水や土がシールド掘進機１Ａ内に侵入することを防止することができ、また、発進口４０が開口しても、外胴７の前端部に内胴６の後端部を内嵌させた状態にして、これらの間を止水シール４４によりシールすることができ、内胴６と外胴７の間から水や土がシールド掘進機１Ａ内に進入するのを防止できる。
【００５１】
第２後胴９の外径は外胴７の内径未満であるため、第１後胴８の前端部分に、外胴７に中折れ可能に内嵌される中折れ部５を形成すると共に、第２後胴９を前後にスライド可能に内嵌させることができる。外胴７に対して第２後胴９が推進して外胴７の内側に位置すると、第２後胴９と外胴７との間に隙間が生じるが、第２後胴９に装着された複数の後胴支持部材６０を第２後胴９外へ突出させ、これら後胴支持部材６０によって、外胴７に対して隙間が生じた状態の第２後胴９をガタツキなく支持でき、発進口４０から分岐シールド掘進機１Ｂを安定させた状態で確実に分岐発進させることができる。
【００５２】
尚、複数の後胴支持部材６０を油圧駆動又は電動駆動して第２後胴９内に待機させた位置から第２後胴９外へ突出させた位置へ切り換えるようにしてもよい。また、前胴２を省略すると共に、内胴６と外胴７とを前胴とし、場合によって、これら内胴６と外胴７とを前方へ延長し、この内胴６にカッターディスク１０が支持されるように構成してもよい。
【００５３】
尚、本発明は、泥水式シールド掘進機だけでなく、土圧式シールド掘進機等の種々のシールド掘進機、及びそのシールド掘進機を用いた分岐シールド掘進方法に適用可能である。本発明は以上説明した実施の形態に限定されるものではなく、当業者であれば、本発明の趣旨を逸脱しない範囲で、前記実施形態に種々の変更を付加して実施することができ、本発明はそれらの変更形態をも包含するものである。
【００５４】
【発明の効果】
請求項１の分岐発進可能なシールド掘進機によれば、内胴に分岐シールド掘進機の分岐発進用の発進口を形成し、この内胴に外胴を前後にスライド可能に外嵌させ、この外胴に後続するように後胴を中折れ部を介して外胴に連結したので、シールド掘進機により本線トンネルをカーブ状に掘進することが可能になる。
第１後胴の前端部分にジャッキ取付部材としての第２後胴を前後にスライド可能に内嵌させ、前記第２後胴に複数のシールドジャッキを取り付けたので、複数のシールドジャッキを、その出力部を第１後胴の内面に組み付けたセグメントに接近させて第２後胴に固定的に簡単に取り付けることができる。それ故、内胴と外胴とを一体的に連結し、第１後胴と第２後胴とを一体的に連結した状態で、複数のシールドジャッキを作動させることにより、これらシールドジャッキの反力をセグメントでとって推力を均等に発生させ、シールド掘進機を確実且つ円滑に推進させることができる。
【００５５】
分岐地点においてシールド掘進機から分岐シールド掘進機を分岐発進させる場合には、内胴と外胴との連結（第１連結部材による連結）と第１後胴と第２後胴との連結（第２連結部材による連結）を解除し、また、第３連結部材により内胴と第２後胴とを一体的に連結した状態で、複数のシールドジャッキを作動させることにより、その推力を均一に発生させて内胴に伝達して、外胴及び第１後胴に対して、第３連結部材により連結された内胴及び第２後胴を一体的に確実且つ円滑に推進させて発進口を開口させ、その発進口から分岐シールド掘進機を分岐発進させることができる。
【００５６】
請求項２の分岐発進可能なシールド掘進機によれば、基本的に、請求項１のシールド掘進機と同様の効果を奏する。その他、特に、内胴の前後両端付近で外胴と内胴の間を止水する止水シールを設けたので、内胴を外胴に内嵌させた状態で、これら内胴と外胴の間から水や土がシールド掘進機内に侵入することを防止するのをでき、また、発進口が開口しても、外胴の前端部に内胴の後端部を内嵌させた状態にして、これらの間を止水シールによりシールすることができ、内胴と外胴の間から水や土がシールド掘進機内に侵入するのを防止できる。
【００５７】
請求項３の分岐発進可能なシールド掘進機によれば、第４連結部材により第１後胴とこの第１後胴の内面に組み付けたセグメントとを連結することができる。
請求項４の分岐発進可能なシールド掘進機によれば、第２後胴の外径は外胴の内径未満であるため、第１後胴の前端部分に、外胴に中折れ可能に内嵌される中折れ部を形成すると共に、この中折れ部に第２後胴を前後にスライド可能に内嵌させることができる。外胴に対して第２後胴が推進して外胴の内側に位置すると、第２後胴と外胴との間に隙間が生じるが、第２後胴に装着された複数の後胴支持部材を第２後胴外へ突出させ、これら後胴支持部材によって、外胴に対して隙間が生じた状態の第２後胴をガタツキなく支持でき、発進口から分岐シールド掘進機を安定させた状態で確実に分岐発進させることができる。
【００５８】
請求項５の分岐シールド掘進方法によれば、請求項２に記載のシールド掘進機から分岐シールド掘進機を分岐発進させる際に、第１工程において、内胴を外胴に内嵌させた状態で外胴と内胴とを第１連結部材で一体的に且つ連結解除可能に連結すると共に第１，第２後胴を第２連結部材で一体的に且つ連結解除可能に連結した状態でシールド掘進機を掘進させ、分岐地点の手前に到達したときにシールド掘進機の掘進を停止させ、次に、第２工程において、第１，第２連結部材による連結を解除して、複数のシールドジャッキを用いて、残置される外胴及び第１後胴に対して第３連結部材で一体的に連結された内胴及び第２後胴を分岐地点まで一体的に推進させて発進口を開口させ、その後、第３工程において、発進口から分岐シールド掘進機を分岐発進させるので、基本的に請求項１と同様の効果を奏する。
【００５９】
請求項６の分岐シールド掘進方法によれば、請求項５の発明において、請求項２に記載のシールド掘進機に代えて請求項３に記載のシールド掘進機から分岐シールド掘進機を分岐発進させる際に、第２工程において、第１後胴と第１後胴の内面に組み付けたセグメントとを第４連結部材で連結することにより、複数のシールドジャッキによる推力を第２後胴、内胴、前胴に伝達して、外胴及び第１後胴に対して前胴と共に内胴及び第２後胴を確実に推進させることができる。
【００６０】
請求項７の分岐シールド掘進方法によれば、請求項５の発明において、第２工程において、外胴及び第１後胴に対して内胴及び第２後胴を推進させると、第２後胴が外胴の内側に位置し、この第２後胴と外胴との間に隙間が生じるが、その際、第２後胴に予め装着した複数の後胴支持部材を第２後胴外へ突出させて、これら後胴支持部材を介して、外胴に対して隙間が生じた状態の第２後胴をガタツキなく支持することができ、発進口から分岐シールド掘進機を安定させた状態で確実に分岐発進させることができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るシールド掘進機の縦断面図である。
【図２】図１のII−II線断面図である。
【図３】図１のIII − III線断面図である。
【図４】シールド掘進機（分岐地点の手前に停止時）の縦断面図である。
【図５】シールド掘進機（発進口開口時）の縦断面図である。
【図６】シールド掘進機と分岐シールド掘進機（分岐発進時）の縦断面図である。
【図７】シールド掘進機と分岐シールド掘進機（分岐発進時）の縦断面図である。
【符号の説明】
ＴＡ本線トンネル
１Ａシールド掘進機
１Ｂ分岐シールド掘進機
２前胴
４後胴
５中折れ部
６内胴
７外胴
８第１後胴
９第２後胴
１０カッターディスク
４０発進口
４３，４４止水シール
５０テールシール
５１シールドジャッキ
６０後胴支持部材
７０エレクタ装置
８０第１連結部材
８１第２連結部材
８２第３連結部材
８３第４連結部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield machine and a branch shield method capable of branching, and more particularly, to a technique for branching and starting a branch shield machine from a shield machine capable of digging a main tunnel in a curved shape.
[0002]
[Prior art]
Conventionally, in the tunnel shield method, when constructing a main tunnel whose inner surface is lined with a segment and a branch tunnel that branches off from the main tunnel, the main tunnel is dug with a shield machine and shield tunneling is carried out at the branch point. A technique is known in which a branch shield machine is branched from a machine, and a branch tunnel is dug using the branch shield machine.
As a shield machine used in this branch start technology, an inner cylinder having a start port for branch start, an outer cylinder slidably fitted back and forth on the inner cylinder, and a cutter disk supported by the inner cylinder And the thing provided with the some shield jack attached to the rear-end part of an inner cylinder is provided practically (for example, refer patent document 1).
[0003]
When excavating the main tunnel with this shield machine, the inner trunk and the outer trunk are connected together. When branching the tunnel shield machine, the shield tunneling machine is first placed before the branch point. Stop machine drilling. Next, while fixing an outer cylinder to the segment assembled | attached to the inner surface of an outer cylinder, the connection of an inner cylinder and an outer cylinder is cancelled | released, and an inner cylinder is propelled to a branch point with a some shield jack. At that time, the outer trunk is left behind and the start opening is opened, and then the branch shield machine is started from the start opening.
[0004]
Further, the applicant of the present application has a front cylinder on which the cutter disk is supported, a rear cylinder equipped with an erector device, and a center folding part that connects the front cylinder and the rear cylinder so as to be able to be folded. Have been put to practical use (see, for example, Patent Document 2). In such a shield machine, a plurality of shield jacks are attached to the rear cylinder, and the shield machine is propelled by taking the reaction force of these shield jacks on the inner surface of the rear cylinder.
[0005]
[Patent Document 1]
Japanese Patent No. 3268342
[Patent Document 2]
Japanese Patent Laid-Open No. 2001-20660
[0006]
[Problems to be solved by the invention]
In the shield machine as disclosed in Patent Document 1, since the trunk member cannot be folded, the main tunnel cannot be dug in a curved shape and is very inferior in versatility. This type of shield machine capable of branching and starting is generally put into practical use as applied to a shield machine that excavates a tunnel in a straight line, and there is a great difficulty in constructing the trunk member so that it can be folded.
When the trunk member of the shield machine capable of branch start is configured to be foldable as in Patent Document 2, the rear trunk equipped with an erector device so that the inner cylinder follows the outer cylinder into which the inner cylinder is fitted. It is conceivable that the two are connected so that they can be folded. However, the mounting position of a plurality of shield jacks becomes a problem.
[0007]
First, it is conceivable to attach a plurality of shield jacks to the rear trunk. In this case, the shield machine can be propelled as usual using a plurality of shield jacks attached to the rear trunk, but the launch opening is opened because the thrust from the shield jack is not transmitted to the inner trunk. Therefore, it is impossible to propel the inner cylinder with respect to the outer cylinder. Therefore, it is conceivable to attach a plurality of shield jacks to the inner trunk. However, if a plurality of shield jacks are attached to the inner trunk that is swung with respect to the rear trunk, it is difficult to generate thrust evenly by taking the reaction force of the plurality of shield jacks on the inner surface of the rear trunk. In some cases, there is a possibility that the shield machine can be reliably and smoothly propelled, and the inner cylinder cannot be reliably and smoothly propelled with respect to the outer cylinder in order to open the start opening.
[0008]
Moreover, in order to attach the plurality of shield jacks to the inner cylinder located on the front side of the rear trunk so that the output portions of the plurality of shield jacks approach the segment, the length of each shield jack increases, A large connecting member for connecting the shield jack to the inner trunk is required, and eventually, it is difficult to attach a plurality of shield jacks.
An object of the present invention is to provide a shield tunneling machine and a branch shield tunneling method capable of branching and starting, in which a main tunnel can be dug in a curved shape with the shield tunneling machine, and the shield tunneling machine is securely and securely used by using a plurality of shield jacks For example, the inner cylinder in which the start opening is formed is propelled smoothly and reliably, the start opening is opened, and the branch shield machine is branched from the start opening.
[0009]
[Means for Solving the Problems]
The shield machine capable of branch start according to claim 1 is a shield machine capable of branch start in which the main tunnel is dug by the shield machine and the branch shield machine is branched from the shield machine at the branch point. An inner cylinder in which a branch start for a branch shield machine is formed, an outer cylinder slidably fitted back and forth on the inner cylinder, and an outer cylinder with the inner cylinder fitted into the outer cylinder. A first connecting member for connecting the body and the inner body so as to be disengaged integrally is provided, and a rear body provided to follow the outer body, and the outer body and the rear body can be folded. An intermediate folding portion to be connected, and the rear cylinder includes a first rear cylinder and a second rear cylinder slidably fitted to a front end portion of the first rear cylinder, A second connecting member is provided to connect the second rear body integrally and releasably, A plurality of shield jacks are attached to the second rear trunk, and when the branch shield machine is started, the connection by the first coupling member and the second coupling member is released, and the outer trunk is left using the plurality of shield jacks. The inner cylinder and the second rear cylinder, which are integrally connected to the first rear cylinder by the third connecting member, are integrally driven to open the start opening. Is.
[0010]
In this shield machine, a start port for branch start of the branch shield machine is formed in the inner cylinder, and the outer cylinder is fitted on the inner cylinder so that the outer cylinder is slidable back and forth, and the rear cylinder is followed by the outer cylinder. Is connected to the outer trunk through a bent portion. Therefore, the main tunnel can be dug in a curved shape by the shield machine.
The rear cylinder includes a first rear cylinder and a second rear cylinder as a jack mounting member that is slidably fitted to a front end portion of the first rear cylinder, and a plurality of shields are provided on the second rear cylinder. A jack is attached. Therefore, the inner cylinder and the outer cylinder are integrally connected by the first connecting member, and the first rear cylinder and the second rear cylinder are integrally connected by the second connecting member. The shield jack is activated and the shield machine is propelled.
[0011]
When branching a shield shield machine from a shield machine at a branch point, the inner cylinder and the outer cylinder are connected (connection by the first connecting member), and the first rear cylinder and the second rear cylinder are connected (first 2) is released, and the plurality of shield jacks are operated in a state where the inner cylinder and the second rear cylinder are integrally connected by the third connection member. The inner cylinder and the second rear cylinder connected by the third connecting member to the outer cylinder and the first rear cylinder are integrally propelled forward to open the start opening. And a branch shield machine is branched and started from the starting port.
[0012]
A shield excavator capable of branch start according to claim 2 is a cutter excavator capable of branch start in which a main tunnel is excavated by the shield excavator and the branch shield excavator is branched from the shield excavator at the branch point. A front cylinder that supports the disk, an inner cylinder that is integrally connected to the front cylinder so as to follow the front cylinder and that has a start opening for branch start of the branch shield machine, and front and rear of the inner cylinder An outer cylinder that is slidably fitted, a rear cylinder that is provided to follow the outer cylinder and that is equipped with an erector device, and a middle folding part that connects the outer cylinder and the rear trunk so as to be folded. A waterproof seal that stops water between the outer cylinder and the inner cylinder near both front and rear ends of the inner cylinder, and the rear cylinder includes a first rear cylinder having a tail seal attached to the rear end, and the first rear cylinder. Slides back and forth on the front end of the trunk A plurality of shield jacks attached to the second rear cylinder, and the outer cylinder and the inner cylinder are integrated with each other in a state in which the inner cylinder is fitted into the outer cylinder; A first connecting member for releasably connecting; and a second connecting member for integrally connecting the first rear cylinder and the second rear cylinder so that the connection can be released. Using the plurality of shield jacks in a state where the connection is released, the inner cylinder and the second rear cylinder that are integrally connected to the remaining outer cylinder and the first rear cylinder by the third connecting member are integrated. It is configured to be propelled to open the start opening.
[0013]
This shield machine basically has the same operation as that described in the shield machine of claim 1. Other actions will be additionally described. In this shield machine, the inner cylinder is integrally connected to the front cylinder so as to follow the front cylinder that supports the cutter disk, the rear cylinder is equipped with an erector device, and the outer cylinder and the inner cylinder are located near both front and rear ends of the inner cylinder. A water seal is provided to stop water between the trunks.
[0014]
When a main tunnel is dug with a shield machine, a segment is assembled on the inner surface of the first rear trunk by an erector device, and the main tunnel is lined with the segment. A segment assembled on the inner surface of the first rear trunk takes the reaction force of the plurality of shield jacks and the shield machine advances, and the main ground tunnel is formed by excavating the front ground by the cutter disk. At this time, it is possible to prevent water and soil from entering the shield machine from between the inner cylinder and the outer cylinder sealed with the water-stop seal.
[0015]
When branching a branch shield machine from a shield machine at a branch point, the reaction force of a plurality of shield jacks is taken at a segment assembled on the inner surface of the first rear trunk, and the outer trunk and the first rear trunk are taken. The inner cylinder and the second rear cylinder are integrally propelled forward together with the front cylinder, and the start opening is opened. Here, a plurality of shield jacks are also propelled together with the second rear cylinder with respect to the first rear cylinder, and the interval between the shield jack and the segment is increased, but a temporary segment is appropriately assembled between the shield jack and the segment. By inserting the reaction force receiving member, the thrust generated by the plurality of shield jacks is reliably generated. Even if the starting port opens, the rear end of the inner cylinder is fitted into the front end of the outer cylinder, and a gap between them is sealed with a water-tight seal. Soil is prevented from entering the shield machine.
[0016]
The shield machine capable of branch start according to claim 3 is the invention according to claim 2, First A fourth connecting member for connecting the first rear cylinder and the segment assembled to the inner surface of the first rear cylinder is provided.
According to a fourth aspect of the present invention, the outer diameter of the second rear cylinder is less than the inner diameter of the outer cylinder, and the second rear cylinder includes a second rear cylinder. A plurality of rear torso support members capable of advancing and retreating over a position waiting in the torso and a position protruding to the outside of the second rear torso are mounted, and the inner torso and the first torso When the second rear cylinder is propelled, the second rear cylinder in a state where a gap is generated with respect to the outer cylinder is supported through a plurality of rear cylinder support members protruding outside the second rear cylinder. It is what.
[0017]
Since the outer diameter of the second rear cylinder is less than the inner diameter of the outer cylinder, an intermediate bent portion is formed in the front end portion of the first rear cylinder so as to be able to be bent in the outer cylinder. The second rear cylinder can be fitted in such a manner that it can slide back and forth. When the second rear cylinder is propelled against the outer cylinder and positioned inside the outer cylinder, a gap is formed between the second rear cylinder and the outer cylinder, but a plurality of rear cylinder supports attached to the second rear cylinder The member protrudes outside the second rear cylinder, and the second rear cylinder in a state where a gap is generated with respect to the outer cylinder is supported by these rear cylinder support members.
[0018]
The branch shield excavation method according to claim 5 is the branch shield excavation method using the shield excavator according to claim 2, wherein the outer cylinder and the inner cylinder are first connected with the inner cylinder fitted into the outer cylinder. A first step of digging the shield machine by connecting the members integrally and releasably and stopping the shield machine when reaching a branch point; and the first and second connection members Release the connection by using a plurality of shield jacks, the inner cylinder and the second rear cylinder integrally connected to the remaining outer cylinder and the first rear cylinder by the third connecting member to the branch point It is characterized by comprising a second step of propelling integrally and opening the start opening, and a third step of branching and starting a branch shield machine from the start opening.
[0019]
In this branch shield excavation method, in the first step, the outer cylinder and the inner cylinder are connected integrally and releasably by the first connecting member in a state where the inner cylinder is fitted into the outer cylinder. The machine is dug, and the shield machine is stopped when it reaches the branch point. Next, in the second step, the connection by the first and second connecting members is released, and the plurality of shield jacks are used to connect the remaining outer cylinder and the first rear cylinder with the third connecting member. The inner trunk and the second rear trunk are integrally propelled to the branch point to open the start opening. Thereafter, in the third step, the branch shield machine is branched and started from the start port. This branch shield excavation method basically has the same effect as that of the first aspect.
[0020]
The branch shield digging method according to claim 6 is: In the invention of claim 5, A branch shield excavation method using the shield excavator according to claim 3 instead of the shield excavator according to claim 2, in front In the second step, Before propelling the inner cylinder and the second rear cylinder against the outer cylinder and the first rear cylinder, Connect the first rear cylinder and the segment assembled to the inner surface of the first rear cylinder with the fourth connecting member Keep It is characterized by this.
[0021]
First In two steps First By connecting the first rear cylinder and the segment assembled to the inner surface of the first rear cylinder with the fourth connecting member, the thrust by the plurality of shield jacks is transmitted to the second rear cylinder, the inner cylinder, and the front cylinder, and the outer cylinder The inner cylinder and the second rear cylinder are propelled together with the front cylinder with respect to the first rear cylinder.
[0022]
The branch shield excavation method according to claim 7 is the branch shield excavation method using the shield excavator according to claim 4 in place of the shield excavator according to claim 2 in the invention of claim 5. In two steps, when the inner cylinder and the second rear cylinder are propelled relative to the outer cylinder and the first rear cylinder, a plurality of rear cylinder support members mounted on the second rear cylinder protrude outside the second rear cylinder. The second rear cylinder in a state where a gap is generated with respect to the outer cylinder is supported via the rear cylinder support member.
[0023]
In the second step, when the inner cylinder and the second rear cylinder are propelled relative to the outer cylinder and the first rear cylinder, the second rear cylinder is positioned inside the outer cylinder, and the second rear cylinder and the outer cylinder In this case, a plurality of rear torso support members mounted on the second rear torso are projected outside the second rear torso, and the rear torso support members are used to leave a gap with respect to the outer torso. The second rear cylinder in a state where the is generated is supported.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment is a muddy water type shield excavator capable of branch start, and a branch shield excavation method, in which a main tunnel is excavated with a shield excavator and a branch shield excavator is branched from the shield excavator at a branch point. This is an example when the present invention is applied.
[0025]
First, the shield machine 1A will be described.
As shown in FIGS. 1 to 3, the shield machine 1 </ b> A includes a front cylinder 2, a middle cylinder 3 following the front cylinder 2, a rear cylinder 4 following the middle cylinder 3, a middle cylinder 3 and a rear cylinder 4. Are connected to each other so as to be able to be folded, and a cutter disk 10 is supported on the front cylinder 2, and a tail seal 50 and an erector device 70 are mounted on the rear cylinder 4.
[0026]
The cutter disk 10 includes a central portion 11, a plurality of cutter spokes 12 extending radially outward from the central portion 11, a center cutter 13 attached to the front surface of the central portion 11, and a large number of attached to the front surfaces of the plurality of cutter spokes 12. It has a cutter bit 14. In addition, a copy cutter (not shown) is provided near the outer periphery of the one or more cutter spokes 12 to dig up when bending.
[0027]
A plurality of support members 15 extending rearward are fixed to the rear surface of the cutter disk 10, and a rotation support ring 16 is fixed to the rear end portions of the support members 15. A ring gear is connected to the rear end portion of the rotation support ring 16. 17 is fixed. In order to supply hydraulic pressure for driving the copy cutter, a supply passage member 18 is connected to the central portion 11 and extends rearward.
[0028]
An annular body 20 is fixed to the inner surface of the front barrel 2 in the front and rear, and an outer peripheral portion of a disk-shaped partition wall 22 connects the connecting member 23 to the front side of the mounting plate 21 projecting inward from the rear end portion of the annular body 20. Are connected through. A rotation support ring 16 is slidably fitted between the inner surface of the annular body 20 and the ring member 24 connected to the outer peripheral portion of the partition wall 22 so that the cutter disk 10 is rotatably supported. . The rotation support ring 16 and the annular body 20 and the ring member 24 are sealed with annular seal members 25 and 26, respectively.
[0029]
A plurality of hydraulic motors 27 are mounted forward on the mounting plate 21, and a plurality of drive gears 27 a respectively driven by the hydraulic motors 26 mesh with teeth inside the ring gear 17, and the hydraulic motors 26 are driven synchronously. Thus, the cutter disk 10 is rotated together with the ring gear 17. The supply passage member 18 is connected to a partition wall 22 and is connected to a swivel joint 28 which is also connected to the partition wall 22 from the rear side.
[0030]
A portion surrounded by the front end portion of the front barrel 2, the annular body 20, the rotation support ring 16, the ring material 24, and the partition wall 22 is formed in a chamber 30 for collecting earth and sand excavated by the cutter disk 10. A water supply pipe 31 for supplying water to make the earth and sand collected in the chamber 30 into muddy water, and a drainage pipe 32 for discharging the muddy water in the chamber 30 are disposed. The tip of the mud pipe 32 is inserted through the annular body 20 and reaches the lower end of the chamber 30. A plurality of stirring blades 29 for stirring the excavated soil and water in the chamber 30 are provided on the rear surface of the cutter disk 10.
[0031]
The middle cylinder 3 is integrally connected to the front cylinder 2 so as to follow the front cylinder 2 and has an inner cylinder 6 in which a start port 40 for branch start of the branch shield machine 1B is formed. And an outer cylinder 7 that is slidably fitted on the body. Around the start opening 40, a ring member 40a is fixed in advance by welding. An annular bracket 35 fixedly provided at the rear end portion of the front cylinder 2 and an annular bracket 41 fixedly provided at the front end portion of the inner cylinder 6 are coupled by a plurality of joining bolts.
[0032]
The outer cylinder 7 has a longitudinal length approximately twice that of the front cylinder 2, the inner cylinder 6 has a slightly shorter longitudinal length than the outer cylinder 7, and the outer diameter of the outer cylinder 7 and the outer diameter of the front cylinder 2 are the same. It is. When the front end of the outer cylinder 7 is close to the rear end of the front cylinder 2 and the entire inner cylinder 6 is fitted inside the outer cylinder 7, the outer cylinder 7 and the inner cylinder 6 can be integrally and uncoupled. A first connecting member 80 to be connected, and water-stop seals 43 and 44 for stopping water between the outer cylinder 7 and the inner cylinder 6 in the vicinity of both front and rear ends of the inner cylinder 6 are provided.
A plurality of (for example, 10) first connecting members 80 are provided, arranged at substantially equal intervals in the circumferential direction, and a rear surface of an annular bracket 45 fixedly provided at the rear end portion of the inner body 6. It is welded to the inner surface of the outer cylinder 7. Annular grooves are formed at both front and rear end portions of the inner cylinder 6, and water-stop seals 43 and 44 are attached to the annular grooves, respectively.
[0033]
The rear cylinder 4 includes a first rear cylinder 8 having a tail seal 50 attached to the rear end, and a second rear cylinder 9 (tubular shape) that is slidably fitted back and forth on the front end portion of the first rear cylinder 8. A plurality of shield jacks 51 are arranged at equal intervals in the circumferential direction toward the rear via the ring web 53.
A bent portion 5 having a curved outer surface is formed at the front end portion of the first rear cylinder 8, and the bent portion 5 is fitted into the rear end portion of the outer cylinder 7 so as to be bent. A space between the bent portion 5 and the rear end portion of the outer cylinder 7 is sealed with an annular seal 52.
[0034]
The middle folded part 5 of the first rear cylinder 8 and the second rear cylinder 9 fitted in the middle folded part 5 have the same longitudinal length, and the outer diameter of the second rear cylinder 9 is less than the inner diameter of the outer cylinder 7. It is. A ring web 53 is fixedly provided on the inner surface of the rear end portion of the second rear cylinder 9, and the end portions of the cylinder main bodies of the plurality of shield jacks 51 are connected to the ring web 53 so as to be inserted therethrough. A second connecting member 81 for connecting the first rear cylinder 8 and the second rear cylinder 9 integrally and in a releasable manner is provided in a state in which the second rear cylinder 9 is fitted in the bent portion 5. Yes. A plurality of (for example, 10) second connecting members 81 are provided, and are arranged at substantially equal intervals in the circumferential direction, and the rear surface of the ring web 53 fixed to the second rear cylinder 9 and the inner surfaces of the first rear cylinder 8. Welded to.
[0035]
Here, a plurality of middle-folded jacks 55 are arranged in the front-rear direction inside the inner body 6. These half-folded jacks 55 are for swinging the front trunk 2 and the middle trunk 3 with respect to the rear trunk 4 in order to dig the main tunnel TA into a curved shape, and are connected to the respective middle-folded jacks 55. Further, the front end portion of the front thrust transmission tube 56 is fixed to the bracket 41 at the front end portion of the inner cylinder 6, and the rear end portion of the rear thrust transmission tube 57 connected to each of the bent jacks 55 is the ring web of the second rear cylinder 9. 53 is fixed.
[0036]
Further, the second rear cylinder 9 includes a plurality of (for example, 10) rear bodies that can advance and retreat over a position where the second rear cylinder 9 waits in the second rear cylinder 9 and a position where the second rear cylinder 9 protrudes outside the second rear cylinder 9. The trunk support members 60 are mounted at equal intervals in the circumferential direction. Each rear trunk support member 60 is accommodated in a cylindrical accommodation member 61, and the distal end portion of the accommodation member 61 is fitted into a hole formed in the second rear trunk 9 and welded. An operation member 62 is connected to the rear trunk support member 60. The operation member 62 is provided so as to be operable from the inside of the second rear cylinder 9. By operating the operation member 62, the position where the rear cylinder support member 60 is kept in the second rear cylinder 9 and the second rear cylinder are arranged. The position can be switched over to the position where it protrudes out of the body 9.
[0037]
An erector device 70 mounted on the rear cylinder 4 is supported on a ring web 65 fixed to the rear cylinder 4 so as to be rotatable via a plurality of rollers, and is rotated by a hydraulic motor (not shown). And an erector main body 72 mounted on the erector drum 71. The plurality of segments S are assembled in a ring shape on the inner surface of the rear barrel 4 by the erector device 70, and the segments S are pushed rearward by the spreader 51a connected to the output portions of the plurality of shield jacks 51. The reaction force of the plurality of shield jacks 51 is taken, and the shield machine 1A propels.
[0038]
Next, a branch shield excavation method in which the main tunnel TA is excavated by the shield excavator 1A described above, and the branch shield excavator 1B is branched and started from the shield excavator 1A at the branch point is based on FIGS. I will explain.
[0039]
In the branch shield digging method using this shield machine 1A, first, the outer cylinder 7 and the inner cylinder 6 are integrated with a plurality of first connecting members 80 in a state where the inner cylinder 6 is fitted into the outer cylinder 7. In addition, the first rear cylinder 8 and the second rear cylinder 9 are connected in a state in which the second rear cylinder 9 is fitted in the front end portion (the middle bent portion 5) of the first rear cylinder 8 while being coupled so as to be disengageable. The second connecting member 81 is integrally and releasably connected so as to excavate the shield machine 1A, and when reaching the branch point, the shield machine 1A stops excavation (first step). . The segment S for one ring last assembled by the erector device 70 when the shield machine 1A is stopped is a steel segment.
[0040]
Next, the water supply pipe 31, the mud discharge pipe 32, and the erector device 70 are removed, and then a water supply / discharge mud hose (not shown) is connected in order to excavate a slightly front ground. Thereafter, as shown in FIG. 4, the shield jack 51 in the vicinity of the start opening 40, the bent jack 55 and the thrust transmission pipes 56 and 57 are removed, and then a pair of annular tube seals 76 are attached to the inner surface portion. The entrance ring 75 thus carried is carried into the middle body 3, and the front end portion of the entrance ring 75 is fitted into a ring member 40 a fixed in advance around the start opening 40 and welded.
[0041]
Subsequently, the front cylinder 91 supporting the cutter disk 90 of the shield machine 1B capable of branch start is inserted and set in the entrance ring 75, and the front cylinder 91 is fixed to the entrance ring 75 by the reaction force receiving members 77 and 78. To do. Next, in a state where the ring-shaped fourth connecting member 83 is in contact with the front surface of the assembled steel segment S, the fourth connecting member 83 is welded to the inner surface of the first rear cylinder 8 and the segment Also welded to S. Thereafter, the tube seal 76 of the entrance ring 75 is actuated to seal the space between the cutter disk 90 and the front cylinder 91 of the branch shield machine 1B and the entrance ring 75, and then the chamber on the front side of the front cylinder 91 in the entrance ring 75. A high-concentration muddy water is injected into a space including a predetermined muddy water injection device (not shown) to prepare for the opening of the start opening 40.
[0042]
Next, as shown in FIG. 5, the first rear cylinder 8 and the segment S assembled on the inner surface of the first rear cylinder 8 are connected by the fourth connecting member 83 as described above, and the inner cylinder 6 and the second rear cylinder are connected. The cylinder 9 is connected by a plurality of (for example, ten) third connecting members 82, and the middle bent portion 5 of the first rear cylinder 9 and the outer cylinder 7 are welded, and then the first connecting member 80 is used. The connection between the outer cylinder 7 and the inner cylinder 6 is released, and the connection between the first rear cylinder 8 and the second rear cylinder 9 by the second connection member 81 is released. In this state, a plurality of shield jacks 51 are used. The cutter disc 10, the front cylinder 2, the inner cylinder 6, and the second rear cylinder 9 are integrally propelled to the branch point with respect to the outer cylinder 7 and the first rear cylinder 8 to open the starting port 40 (second step). ).
[0043]
Regarding the propulsion of the cutter disk 10, the front cylinder 2, the inner cylinder 6 and the second rear cylinder 9 with respect to the outer cylinder 7 and the first rear cylinder 8, first, the reaction force of the plurality of shield jacks 51 is finally applied by the erector device 70. The process is performed with the assembled segment S, and thereafter, while the special segment Sa is assembled on the inner surfaces of the first rear cylinder 8 and the outer cylinder 7, the reaction force of the plurality of shield jacks 51 is taken with the special segment Sa.
[0044]
Here, when the inner cylinder 6 is propelled with respect to the outer cylinder 7, a gap for the outer cylinder 7 is generated on the outer surface side of the inner cylinder 6. Therefore, along with the propulsion of the inner cylinder 6 or after the completion of the propulsion of the inner cylinder 6, Backing material is injected into the gap from the injection tube 69 to fill the gap. When the second rear cylinder 9 is propelled relative to the first rear cylinder 8, the second rear cylinder 9 is positioned inside the outer cylinder 7, and a gap is generated between the second rear cylinder 9 and the outer cylinder 7. Therefore, during or after the completion of the propulsion of the second rear cylinder 9, the plurality of operating members 62 are operated to project the plurality of rear cylinder support members 60 out of the second rear cylinder 9, and these rear cylinder support members 60 supports the second rear cylinder 9 in a state where a gap is generated with respect to the outer cylinder 7.
[0045]
Next, after the start opening 40 is opened, a plurality of reaction force receiving members 85 are inserted between the special segment Sa assembled on the inner surface of the outer cylinder 7 and the second rear cylinder 9. After the member 85 is disposed (fixed) on the inner surface of the outer body 7, the remaining plurality of shield jacks 51 and the like are removed. Next, as shown in FIG. 6, a reaction force wall 95 is attached to the inner surface of the inner cylinder 6 opposite to the start opening 40, and the connection between the entrance ring 75 and the front cylinder 91 by the reaction force receiving members 77 and 78 is released. In this state, the reaction force of the plurality of shield jacks 92 installed on the front trunk 91 of the branch shield machine 1B is taken by the reaction wall 95 and the temporary segment 96 to propel the branch shield machine 1B and open it. A branch start is started from the start port 40 (third step).
[0046]
With the rear end of the front barrel 91 reaching the vicinity of the tube seal 76 of the entrance ring 75, the propulsion of the branch shield machine 1B is stopped, and then the front barrel 91 and the entrance ring 75 are moved by the reaction force receiving members 77 and 78. After reconnecting and removing the temporary segment 96, the rear cylinder 93 of the branch shield machine 1B is loaded and connected to the front cylinder 91 as shown in FIG. Thereafter, the connection between the entrance ring 75 and the front barrel 91 by the reaction force receiving members 77 and 78 is released, and the reaction force of the plurality of shield jacks 92 is taken by the reaction force wall 95 and the temporary segment 96 to branch the shield machine 1B. Is promoted and the branch tunnel TB is dug.
[0047]
The operation and effect of the shield excavator 1A capable of branch start described above and the branch shield excavation method performed using the shield excavator 1A will be described.
Since the outer body 7 of the middle body 3 and the first rear body 8 are connected so as to be able to be folded, the main tunnel TA can be dug in a curve, and the branch shield machine 1B is branched at the branch point. Since the branch tunnel TB can be excavated by the branch shield machine 1B, it is extremely excellent in versatility.
[0048]
Since the second rear cylinder 9 is slidably fitted back and forth in the front end portion of the first rear cylinder 8, and the plurality of shield jacks 51 are attached to the second rear cylinder 9, the plurality of shield jacks 51 are output. The spreader 51a, which is a part, can be fixedly and simply attached to the rear cylinder 4 by approaching the segment S assembled on the inner surface of the first rear cylinder 8. Therefore, the inner cylinder 6 and the outer cylinder 7 of the middle cylinder 3 are integrally connected by a plurality of first connecting members 80, and the first rear cylinder 8 and the second rear cylinder 9 are connected by a plurality of second connections. By operating the plurality of shield jacks 51 in a state of being integrally connected by the member 81, the reaction force of these shield jacks 51 is taken by the segment S to generate a thrust uniformly, and the shield machine 1A can be reliably and smoothly operated. Can be promoted.
[0049]
When the branch shield machine 1B is branched and started from the shield machine 1A at the branch point, the connection between the inner body 6 and the outer body 7 by the first connection member 80 and the first rear body 8 by the second connection member 81 are performed. And the second rear cylinder 9 are released, the inner cylinder 6 and the second rear cylinder 9 are integrally connected by a plurality of third connecting members 82, and the first rear cylinder 8 and the segment S are connected. By operating the plurality of shield jacks 51 in a state of being integrally connected by the fourth connecting member 83, the thrust is uniformly generated and transmitted to the inner body 6, and is transmitted to the outer body 7 and the first rear body 8. On the other hand, the front cylinder 2, the inner cylinder 6 and the second rear cylinder 9 can be integrally and reliably propelled to open the start port 40, and the branch shield machine 1B can be branched and started from the start port 40. .
[0050]
Since the main tunnel TA can be excavated by the shield machine 1A, the water-stopping seals 43 and 44 for stopping the water between the outer cylinder 7 and the inner cylinder 6 are provided in the vicinity of both the front and rear ends of the inner cylinder 6. Can be prevented from entering the shield machine 1A from between the inner cylinder 6 and the outer cylinder 7, and the start opening 40 is opened. Even in this state, the rear end portion of the inner cylinder 6 is fitted in the front end portion of the outer cylinder 7, and the space between them can be sealed by the water-stop seal 44. It is possible to prevent water and soil from entering the shield machine 1A.
[0051]
Since the outer diameter of the second rear cylinder 9 is less than the inner diameter of the outer cylinder 7, the middle folded portion 5 is formed in the front end portion of the first rear cylinder 8 so as to be able to be folded into the outer cylinder 7. The second rear cylinder 9 can be fitted in such a manner that it can slide back and forth. When the second rear cylinder 9 is propelled with respect to the outer cylinder 7 and positioned inside the outer cylinder 7, a gap is formed between the second rear cylinder 9 and the outer cylinder 7. The plurality of rear torso support members 60 are protruded out of the second rear torso 9, and the back torso support members 60 can support the second rear torso 9 in a state where a gap is generated with respect to the outer torso 7, without rattling. The branch shield excavator 1B can be reliably branched and started from the start port 40.
[0052]
It should be noted that the plurality of rear cylinder support members 60 may be switched from a position in which the plurality of rear cylinder support members 60 are hydraulically or electrically driven to stand by in the second rear cylinder 9 to a position protruding outside the second rear cylinder 9. In addition, the front cylinder 2 is omitted, and the inner cylinder 6 and the outer cylinder 7 are used as front cylinders. In some cases, the inner cylinder 6 and the outer cylinder 7 are extended forward, and a cutter disk 10 is attached to the inner cylinder 6. You may comprise so that it may be supported.
[0053]
The present invention can be applied not only to a muddy water shield machine, but also to various shield machines such as earth pressure shield machines, and branch shield machines using the shield machine. The present invention is not limited to the embodiment described above, and those skilled in the art can implement the invention by adding various modifications to the embodiment without departing from the spirit of the present invention. The present invention includes those modifications.
[0054]
【The invention's effect】
According to the shield machine capable of branch start according to claim 1, the branch opening of the branch shield machine is formed in the inner cylinder, and the outer cylinder is fitted on the inner cylinder so as to be slidable back and forth. Since the rear cylinder is connected to the outer cylinder via the bent portion so as to follow the outer cylinder, the main tunnel can be dug in a curve by the shield machine.
Since the second rear cylinder as a jack mounting member is slidably fitted back and forth in the front end portion of the first rear cylinder, and a plurality of shield jacks are attached to the second rear cylinder, a plurality of shield jacks are output. The part can be fixedly and simply attached to the second rear cylinder by approaching the segment assembled on the inner surface of the first rear cylinder. Therefore, by connecting a plurality of shield jacks in a state where the inner cylinder and the outer cylinder are integrally connected, and the first rear cylinder and the second rear cylinder are integrally connected, The force can be taken by the segment to generate the thrust uniformly, and the shield machine can be reliably and smoothly propelled.
[0055]
When branching a shield shield machine from a shield machine at a branch point, the inner cylinder and the outer cylinder are connected (connection by the first connecting member), and the first rear cylinder and the second rear cylinder are connected (first 2), the thrust is generated uniformly by operating a plurality of shield jacks in a state where the inner cylinder and the second rear cylinder are integrally connected by the third connecting member. The inner cylinder and the second rear cylinder connected to the outer cylinder and the first rear cylinder by the third connecting member are integrally and reliably propelled to open the start opening. The branch shield machine can be branched and started from the starting port.
[0056]
According to the shield machine capable of branching start according to the second aspect, basically the same effect as the shield machine according to the first aspect is obtained. In addition, since a water seal is provided between the outer cylinder and the inner cylinder, particularly in the vicinity of the front and rear ends of the inner cylinder, the inner cylinder and the outer cylinder are fitted with the inner cylinder fitted into the outer cylinder. It is possible to prevent water and soil from entering the shield machine from the middle, and even if the starting port opens, the rear end of the inner cylinder is fitted inside the front end of the outer cylinder. The space between them can be sealed with a water-stop seal, and water and soil can be prevented from entering the shield machine from between the inner cylinder and the outer cylinder.
[0057]
According to the shield machine capable of branch start of claim 3, First The four connecting members can connect the first rear cylinder and the segment assembled to the inner surface of the first rear cylinder.
According to the shield excavator capable of branch start according to claim 4, since the outer diameter of the second rear cylinder is smaller than the inner diameter of the outer cylinder, it is fitted in the front end portion of the first rear cylinder so as to be able to bend into the outer cylinder. In addition to forming the bent portion, the second rear cylinder can be fitted into the bent portion so as to be slidable back and forth. When the second rear cylinder is propelled against the outer cylinder and positioned inside the outer cylinder, a gap is formed between the second rear cylinder and the outer cylinder, but a plurality of rear cylinder supports attached to the second rear cylinder The member protrudes outside the second rear torso, and the rear torso support member can support the second rear torso in a state where there is a gap with respect to the outer torso, and the branch shield machine is stabilized from the starting port. It is possible to reliably start branching in the state.
[0058]
According to the branch shield excavation method of claim 5, when the branch shield excavator is branched and started from the shield excavator according to claim 2, in the first step, the inner cylinder is fitted in the outer cylinder. Shield digging in a state where the outer cylinder and the inner cylinder are connected integrally and releasably with the first connecting member, and the first and second rear cylinders are connected integrally and releasably with the second connecting member. Digging the machine, stop the digging of the shield machine when reaching the branch point, then, in the second step, release the connection by the first and second connecting members, and a plurality of shield jacks Using the inner cylinder and the second rear cylinder, which are integrally connected to the remaining outer cylinder and the first rear cylinder by the third connecting member, are integrally propelled to the branch point to open the start opening. Then, in the third step, branch shield digging from the start The so branches start, basically the same effect as claim 1.
[0059]
According to the branch shield excavation method of claim 6, in the invention of claim 5, when the branch shield excavator is branched from the shield excavator according to claim 3 instead of the shield excavator according to claim 2, In addition, First In two steps First By connecting the first rear cylinder and the segment assembled to the inner surface of the first rear cylinder with the fourth connecting member, the thrust by the plurality of shield jacks is transmitted to the second rear cylinder, the inner cylinder, and the front cylinder, and the outer cylinder The inner cylinder and the second rear cylinder can be reliably propelled together with the front cylinder with respect to the first rear cylinder.
[0060]
According to the branch shield excavation method of claim 7, in the invention of claim 5, in the second step, when the inner cylinder and the second rear cylinder are propelled relative to the outer cylinder and the first rear cylinder, the second rear cylinder Is located on the inner side of the outer cylinder, and a gap is formed between the second rear cylinder and the outer cylinder. At this time, a plurality of rear cylinder support members mounted in advance on the second rear cylinder are moved out of the second rear cylinder. Through the rear trunk support member, the second rear trunk in a state where a gap is generated with respect to the outer trunk can be supported without rattling, and the branch shield excavator can be stabilized from the start opening. The branch start can be surely made.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a shield machine according to an embodiment of the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a longitudinal sectional view of a shield machine (when stopped before a branch point).
FIG. 5 is a vertical cross-sectional view of a shield machine (when the start opening is open).
FIG. 6 is a longitudinal sectional view of a shield machine and a branch shield machine (at the time of branch start).
FIG. 7 is a longitudinal sectional view of a shield machine and a branch shield machine (at the time of branch start).
[Explanation of symbols]
TA Main Line Tunnel
1A Shield machine
1B Branch shield machine
2 Front torso
4 Rear trunk
5 Folding part
6 Inner trunk
7 outer trunk
8 First rear trunk
9 Second rear trunk
10 Cutter disc
40 Start
43,44 Water seal
50 Tail seal
51 Shield Jack
60 Rear trunk support member
70 Electa device
80 first connecting member
81 Second connecting member
82 Third connecting member
83 4th connecting member

Claims

In the shield tunneling machine that can start branching by digging the main tunnel with the shield tunneling machine and branching the branch shield tunneling machine from the shield tunneling machine at the branch point,
In the state where the inner cylinder in which the start port for branch start of the branch shield machine is formed, the outer cylinder which is externally fitted to the inner cylinder so as to be slidable back and forth, and the inner cylinder is fitted in the outer cylinder A first connecting member that connects the outer body and the inner body integrally and releasably,
A rear cylinder provided to follow the outer cylinder, and a middle folding part that connects the outer cylinder and the rear trunk so as to be capable of being folded;
The rear cylinder includes a first rear cylinder and a second rear cylinder that is slidably fitted to a front end portion of the first rear cylinder. The first rear cylinder and the second rear cylinder are integrated with each other. And the 2nd connection member connected so that connection release is possible,
A plurality of shield jacks are attached to the second rear trunk,
When the branch shield machine is started, the connection by the first connection member and the second connection member is released, and a plurality of shield jacks are used to leave the remaining outer trunk and the first rear trunk by the third connection member. A shield machine capable of branch start, wherein the inner cylinder and the second rear cylinder, which are integrally connected, are integrally propelled to open the start port.

In the shield tunneling machine that can start branching by digging the main tunnel with the shield tunneling machine and branching the branch shield tunneling machine from the shield tunneling machine at the branch point,
A front cylinder that supports the cutter disk, an inner cylinder that is integrally connected to the front cylinder so as to follow the front cylinder and that has a start opening for branch start of the branch shield machine, and front and rear of the inner cylinder An outer cylinder that is slidably fitted to the outer cylinder, a rear cylinder that is provided to follow the outer cylinder and that is equipped with an erector device, and a middle folding part that connects the outer cylinder and the rear trunk so as to be able to be folded , With a water-stop seal that stops water between the outer cylinder and the inner cylinder near the front and rear ends of the inner cylinder,
The rear cylinder includes a first rear cylinder having a tail seal attached to a rear end portion, and a second rear cylinder that is slidably fitted back and forth on the front end portion of the first rear cylinder.
A plurality of shield jacks attached to the second rear cylinder, and a first connecting member that connects the outer cylinder and the inner cylinder integrally and releasably with the inner cylinder fitted into the outer cylinder; Providing a second connecting member for connecting the first rear cylinder and the second rear cylinder integrally and releasably;
The inner cylinder integrally connected to the remaining outer cylinder and the first rear cylinder by the third connecting member using a plurality of shield jacks in a state where the connection by the first and second connecting members is released. And a shield machine capable of branch start, wherein the second rear cylinder is integrally propelled to open the start port.

The shield excavator capable of branch start according to claim 2, further comprising a fourth connecting member for connecting the first rear cylinder and a segment assembled to the inner surface of the first rear cylinder.

The outer diameter of the second rear cylinder is less than the inner diameter of the outer cylinder;
A plurality of rear cylinder support members that can advance and retreat over a position that is standby in the second rear cylinder and a position that protrudes outside the second rear cylinder are attached to the second rear cylinder,
When propelling the inner cylinder and the second rear cylinder with respect to the outer cylinder and the first rear cylinder, a gap is formed with respect to the outer cylinder through a plurality of rear cylinder support members protruding outside the second rear cylinder. The shield excavator capable of branch start according to claim 2 or 3, wherein the second rear trunk in a generated state is supported.

In the branch shield excavation method using the shield excavator according to claim 2,
With the inner cylinder fitted into the outer cylinder, the outer cylinder and the inner cylinder are connected together by the first connecting member so that the connection can be released, and the first and second rear cylinders are integrated by the second connecting member. First and forcibly digging the shield machine in a connected state so as to be disengageable, and stopping the shield machine when reaching the branch point;
The inner cylinder integrally connected by the third connecting member to the remaining outer cylinder and the first rear cylinder using a plurality of shield jacks, and releasing the connection by the first and second connecting members; A second step of opening the start opening by integrally propelling the second rear trunk to the branch point;
A third step of branching and starting the branch shield machine from the starting port;
A branch shield digging method characterized by comprising:

A branch shield excavation method using the shield excavator according to claim 3 instead of the shield excavator according to claim 2,
Prior Symbol second step, prior to propel the inner shell and the second rear cylinder relative to the outer cylinder and the first rear cylinder, and a segment assembled to the inner surface of the first rear cylinder and the first rear cylinder fourth connecting branch shield method according to claim 5, characterized in that to be connected by members.

A branch shield excavation method using the shield excavator according to claim 4 instead of the shield excavator according to claim 2,
In the second step, when the inner cylinder and the second rear cylinder are propelled relative to the outer cylinder and the first rear cylinder, a plurality of rear cylinder support members mounted on the second rear cylinder are removed from the second rear cylinder. 6. The branch shield digging method according to claim 5, wherein the second rear cylinder in a state where a gap is generated with respect to the outer cylinder is supported via the rear cylinder support member.