JP4246344B2

JP4246344B2 - Tunnel long steel pipe tip receiving method

Info

Publication number: JP4246344B2
Application number: JP2000011000A
Authority: JP
Inventors: 和夫木内; 義孝高橋
Original assignee: 岡部株式会社
Priority date: 2000-01-19
Filing date: 2000-01-19
Publication date: 2009-04-02
Anticipated expiration: 2020-01-19
Also published as: JP2001200687A

Description

【０００１】
【発明の属する技術分野】
本発明は、掘進作業に先だってトンネル切羽の外周辺に長尺の鋼管からなる先受け鋼管を所要数設置し、切羽の前方の地盤の緩みや沈下を予防して施工の安全性を図るトンネルの長尺鋼管先受け工法に関する。より詳しくは、前記先受け鋼管をそれ自体の先端部に付設した自穿孔用ビットによって穿孔しながら地盤中に打設し自穿孔用ビットはそのまま埋め残す自穿孔埋設ビット方式を採用した長尺鋼管先受け工法に関する。
【０００２】
【従来の技術】
長尺鋼管先受け工法として、従来からパイプルーフ工法やＡＧＦ工法などが知られており、これらの工法では、先受け鋼管の内方に配設される穿孔用ロッドの先端部に拡縮可能に構成した穿孔用ビットを装着し、必要に応じて先受け鋼管及び穿孔用ロッドを適数本継足し地盤に対して穿孔して打設する方法が採用されている。そして、その先受け鋼管の地盤に対する穿孔打設作業が完了した場合には、前記穿孔用ビットを縮小して、同先受け鋼管の内方の中空部を介して前記穿孔用ロッドと共に穿孔用ビットを回収し、しかる後、グラウト材を注入するという手法が一般的に採用されている。しかしながら、以上の工法は、穿孔用ビットを拡縮可能にするため、そのビット自体の構成が複雑になるばかりでなく、同穿孔用ビット等を中空部を介して回収し得るように構成するため、鋼管の内径が大きくなるといった構成上の制約が伴い、その回収作業にも手間がかかることから、穿孔用ビットを回収しないで埋め残す自穿孔埋設ビット方式も開示されている（特開平１１−１９３６８７号公報）。
【０００３】
また、長尺鋼管先受け工法において、先受け鋼管を打設する際に、鋼管の最後端に樹脂製埋設管を接続して、先受け鋼管の最後端がトンネル断面外周線位置とほぼ一致する深さになるように打設し、先受け鋼管と地盤の間に対するグラウト材の充填後、堀削機によりトンネル断面の地盤を前記樹脂製埋設管と共に掘削して切羽を形成するという工法が開示（特開平８−１２１０７３）されている。しかし、この従来工法においては、先受け鋼管の内部に削孔ロッドとを搭載し、該削孔ロッドの先端に装着された拡縮径可能な穿孔用ビットで削孔する方式が採用されているため、装置全体の機構が複雑になったり、ドリフタ等との接続機構が複雑で、削孔ロッドや先受け鋼管の接続作業に手間がかかったり、前記穿孔用ビットの回収に時間がかかるといった問題があった。なお、以上の樹脂製鋼管を用いた工法を前述の自穿孔埋設ビット方式に適用しようとすると、塩化ビニル等からなる樹脂製埋設管自体の強度や鋼管との接続部における接続強度が不足して先受け鋼管の先端部に装着された穿孔用ビットに削孔可能な打撃力と回転力を伝達することは技術的に困難であるという問題があった。このため、自穿孔埋設ビット方式を採用した長尺鋼管先受け工法において樹脂製埋設管を用いた工法は開示されていない。
【０００４】
【発明が解決しようとする課題】
本発明は、以上のような従来の技術的事情に鑑みてなされたもので、自穿孔埋設ビット方式を採用しながら、堀削機によりトンネル断面の地盤を埋設管と共に掘削できるように構成することにより、自穿孔埋設ビット方式の作業上のメリットを取入れてトンネルの長尺鋼管先受け工法の作業性を改善することを目的とするものである。
【０００５】
【課題を解決するための手段】
前記課題を解決するため、請求項１の発明では、前記トンネルの長尺鋼管先受け工法において、先受け鋼管を用いたトンネル断面の周囲の地盤に対する削孔打設作業の終了後、最後部の先受け鋼管を引抜いて樹脂製埋設管に交換し、前記先受け鋼管と地盤の間にグラウト材を充填して切羽の前方の地盤を安定させた後、堀削機によりトンネル断面の地盤を前記樹脂製埋設管と共に掘削するという技術手段を採用した。以上のように、本発明では、先受け鋼管のみを用いて削孔打設作業を行い、その終了後、最後部の先受け鋼管を引抜いて樹脂製埋設管に交換するという技術手段を採用したので、先受け鋼管を介して先端部の自穿孔用ビットに必要な打撃力及び回転力を確実に伝達できるとともに、堀削機によりトンネル断面の地盤を前記樹脂製埋設管と共に掘削できるので、トンネルの長尺鋼管先受け工法としての作業性を大幅に改善することができる。
【０００６】
請求項２の発明では、自穿孔埋設ビット方式を採用する場合に、最後部の先受け鋼管の後端部に樹脂製埋設管を接続する接続手段として、一側に前記先受け鋼管用の連結用部材に対応した連結部を有し、かつ他側に前記樹脂製埋設管を外嵌し得る外径からなる外嵌部を形成した接続部材と、一側に前記接続部材の外嵌部に対して外嵌可能な内径からなる接合部を有し、かつ他側に前記接続部材の外嵌部との間に前記樹脂製埋設管の端部を挿入し得る間隙を形成する挿入部を有するソケット部材とを用い、前記樹脂製埋設管の接続側端部を前記接続部材の外嵌部とソケット部材の挿入部との間に形成される間隙部に挿入した状態で、ソケット部材を接続部材の外嵌部に外嵌して前記樹脂製埋設管の挿入端部と共に接着固定した上、前記鋼管用の連結用部材を介して樹脂製埋設管を最後部の先受け鋼管の後端部に接続するという技術手段を採用した。なお、本技術手段は、請求項３のように、ガラス繊維、カーボン繊維、アラミド繊維等の強化繊維により補強した繊維強化樹脂からなる樹脂製埋設管を用いる場合にも有効である。
【０００７】
【発明の実施の形態】
本発明は、先受け鋼管を用いるトンネルの長尺鋼管先受け工法であれば、広く適用が可能である。先受け鋼管の具体的な長さとしては、３、４ｍのものが一般的であるが、場合に応じて変更可能である。また、接続する先受け鋼管の本数に関しては、地盤等の具体的状況等に応じて設定され、状況によっては１本の場合も可能である。自穿孔用ビットの具体的な形態としては、種々のタイプのものが適用可能である。また、グラウト材としては、セメント系のものやウレタンなどの樹脂系のものの使用が可能であり、先受け鋼管や樹脂製埋設管の外周面と地盤との間隙部に対するグラウト材と、先受け鋼管の内側に充填するグラウト材とを使い分けて、別の種類のものを使用することも可能である。さらに、グラウト材注入用の注入路としては、先受け鋼管自体の内部空間や、塩化ビニル管や、ポリエチレン管、耐圧ホースなどからなる所要強度を有する専用の注入管の採用が可能である。
【０００８】
【実施例】
以下、図面を用いて本発明の実施例に関して説明する。図１は本発明に係る長尺鋼管先受け工法に用いられる先受け鋼管の組立前の状態を示した分解組立図であり、図２はその先受け鋼管の組立状態を示した縦断面図である。図中、１は先受け鋼管であり、その外周面には全体に雄ネジが形成されている。また、２は最前部の先受け鋼管１の先端部に取付けられる自穿孔用ビットであり、３はその最前部の先受け鋼管の内方の、前記自穿孔用ビット２との接続部に設置されるグラウト材注入管の支持部材である。図２に示したように、各先受け鋼管１相互間は連結用部材４によって連結し得るように構成されており、場合に応じて適宜本数の先受け鋼管１を連結して必要な長さに設定し得るように構成されている。連結用部材４の内部には、図示のように先受け鋼管１の外周面に形成された雄ネジに螺合可能な雌ネジが形成されており、それらの螺合による締付力により先受け鋼管１相互間を連結するように構成している。なお、その連結用部材４の内面に形成した雌ネジの中間部に、リング状の凸条部を形成したり、ネジ溝をずらすことによって、先受け鋼管１のネジ込みを阻止するストッパ部を設けるとともに、締付状態においては、先受け鋼管１の端面同士がそれらのストッパ部を跨いで直接当接するように構成することにより、穿孔時に作用する回転力や打撃力を確実に伝達することができる。なお、先受け鋼管１の内方に設置するグラウト材用の注入管は、先受け鋼管１を地盤に打設する前に予めセットしておくようにしてもよいし、打設後にセットするようにしてもよい。
【０００９】
図３は樹脂製埋設管の全体の構成を示した分解組立図であり、図４はその先受け鋼管との接続部を拡大して示した分解組立図、図５は組立状態を示した縦断面図である。図中、５はガラス繊維、カーボン繊維、アラミド繊維等の強化繊維により補強した繊維強化樹脂からなる樹脂製埋設管であり、その両端部には、接続部材６，７がソケット部材８，９を用いて接着固定され、一方の接続部材６は最後部の先受け鋼管１の後端部に接続され、他方の接続部材７は削孔機等の装置側に接続されるように構成されている。そして、それらの接続部材６，７としては、同じ構成からなるものを用いることが一般的であるが、少なくとも前記先受け鋼管１に接続される側の接続部材６は、図４及び図５に示したように、一側に先受け鋼管用の連結用部材４の内部に形成された雌ネジに対応した雄ネジを形成した連結部１０を有し、かつ他側に樹脂製埋設管５を外嵌し得る外径からなる外嵌部１１を有する。また、この接続部材６と対をなすソケット部材８は、一側に前記接続部材６の外嵌部１１に外嵌可能な内径からなる接合部１２を有し、かつ他側にその接続部材６の外嵌部１１との間に樹脂製埋設管５の端部を挿入し得る間隙を形成する挿入部１３を有する。しかして、樹脂製埋設管５の端部に接続部材６を固定する場合には、樹脂製埋設管５の接続側端部を接続部材６の外嵌部１１とソケット部材８の挿入部１３との間に形成される間隙部に挿入した状態で、ソケット部材８を接続部材６の外嵌部１１に外嵌して、樹脂製埋設管５の挿入端部と共にエポキシ系樹脂接着剤等を用いて接着することにより、簡便かつ確実に固定することができる。前記樹脂製埋設管５の先端面をソケット部材８の接合部１２の後部端面に当接し、そのソケット部材８の先端面を接続部材６の連結部１０の後部端面に当接した状態で固定するようにすれば、衝撃力のより的確な伝達が可能である。なお、樹脂製埋設管５の他端部に対しても、同様の手法により前記接続部材７を簡便かつ確実に接着固定することができる。
【００１０】
図６は長尺鋼管先受け工法における削孔打設作業の手順に関する比較例を示した作業説明図であり、また図７はその全体の作業状態を示した作業状態図である。本工法においては、先ず図６の状態（イ）で示したように、１本目の先受け鋼管１ａを前記自穿孔用ビット２により削孔しながら打設する削孔打設作業を行う。この場合、前記先受け鋼管１ａの後端部を、その先受け鋼管１ａの外周面に形成した雄ネジに螺合接続した削孔アダプタ１４を介して、図７に示したトンネルジャンボ等の削孔機１５側に接続して削孔打設作業を行うことになる。しかる後、状態（ロ）で示したように、前記削孔アダプタ１４を１本目の前記先受け鋼管１ａの螺合部から切離して、代りに連結用部材４を用いて２本目の先受け鋼管１ｂを連結し、その後端部に削孔アダプタ１４を螺合した上、削孔機１５による削孔打設作業を行う。そして、状態（ハ）で示したように、更に必要な本数、本実施例では１本の先受け鋼管１ｃを同様の手法で削孔打設して継足し、次の埋設管で所期の全長に達して後端部が支保工と干渉する段階に至った時点で、それまでの最後部の先受け鋼管に該当する前記先受け鋼管１ｃの後端部に、強化繊維により補強された樹脂製埋設管５を連結用部材４を用いて接続して、状態（ニ）に示したように、同様の削孔打設作業を行うことになる。この場合、樹脂製埋設管５の一端が前記接続部材６を介して連結用部材４により先受け鋼管１ｃに接続されるとともに、他端が接続部材７を介して削孔アダプタ１４により削孔機１５に接続された状態で削孔打設作業が行われる。
【００１１】
以上のようにして、所定の先受け鋼管１と樹脂製埋設管５の削孔打設作業が完了した場合には、前記先受け鋼管１ａ〜１ｃないし樹脂製埋設管５と地盤の間にグラウト材を充填して、切羽の前方の地盤を安定させたグラウト材注入作業に移行する。このグラウト材注入作業は、図８に示したように、最前部の先受け鋼管１ａの内部に配設される前記支持部材３に支持して接続した注入管１６を用いてグラウト材を圧送し、自穿孔用ビット２の部分に形成した通路１７を介して外部へ流出させるとともに、最後部の前記樹脂製埋設管５の口部と削孔１８の内面との間に設置される口元注入管１９を介した注入により行われる。なお、必要に応じて先受け鋼管１ａ〜１ｃ内の空間部にもグラウト材を充填してもよい。また、先受け鋼管１ａ〜１ｃ自体を注入管として用いて、その鋼管１ａ〜１ｃに形成した流出孔を介してグラウト材を外部へ流出させることにより地盤との間隙部に充填することも可能である。しかして、所定範囲の先受け鋼管１による地盤安定化が完了したら、必要に応じて前記樹脂製埋設管５の後端部に接着固定された接続部材７の部分を切断や破砕して除去した上、堀削機によりトンネル断面の地盤を樹脂製埋設管５と共に掘削し支保工建込みの作業を行う。この掘削作業においては、最後部の樹脂製埋設管５は樹脂製であり鉄分を含まない故に、堀削機により地盤と同時に容易に掘削除去することが可能であり、特別な工具や機械を必要としないので掘削工程が簡略化される。さらに、次の先受け鋼管１の打設位置を確保するための掘削断面の拡幅と、これに伴う支保工材の拡幅が必要とされないので、拡幅に伴う覆工コンクリ−トの量も減り、掘削作業の効率化と工事コストの低減が図れる。
【００１２】
図９は本発明の実施例に係る長尺鋼管先受け工法における削孔打設作業の手順を示した作業説明図である。本工法は、地盤が硬く削孔が困難な場合に好適である。本工法における手順は、前記比較例における工法の場合と、状態（ロ）までは全く同様の削孔打設作業が実行されるので、その後の状態（ホ）から説明する。本工法における状態（ホ）においては、前記状態（ハ）の場合とは異なり、樹脂製埋設管５は使用せずに、最後まで鋼管からなる先受け鋼管１ａ〜１ｄを用いて所期の全長まで継足して削孔打設作業を完了する。したがって、本工法の場合には、最後の先受け鋼管１ｄの削孔打設作業まで途中に樹脂製埋設管が介在しないので、より強力な打撃力及び回転力を伝達し得ることから、地盤が硬く困難な削孔にきわめて有効である。
【００１３】
以上のように、最後の先受け鋼管１ｄの削孔打設作業まで完了した場合には、状態（ヘ）で示したように、一度打設した先受け鋼管１ａ〜１ｄを最後部の連結用部材４が露出するまで引出して、最後部の先受け鋼管１ｄを連結用部材４から取外し、その代りに、状態（ト）で示したように前記樹脂製埋設管５を接続して元の打設位置に戻す。この場合、先に削孔した打設位置まで単純に押戻してもよいし、孔壁の崩れ等により押戻しでは困難な場合は、再度削孔機に接続して打撃と回転を加えながら所定の位置に戻すようにしてもよい。なお、この元の打設位置に戻す作業においては、既に先の削孔打設作業によって地盤に削孔１８が形成されていることから、小さな打撃力ないし回転力により戻すことが可能である。したがって、本工法による実施例の場合には、樹脂製埋設管５として必ずしも強化繊維により補強された繊維強化樹脂からなるものに限定する必要はない。しかして、以上の戻し作業が終了した場合には、前記工法の場合と同様に、前記先受け鋼管１ａ〜１ｃないし樹脂製埋設管５と地盤の間にグラウト材を充填して、切羽の前方の地盤を安定させた後、必要に応じて前記樹脂製埋設管５の後端部に接着固定された接続部材７の部分を切断や破砕して除去した上、堀削機によりトンネル断面の地盤を樹脂製埋設管５と共に同時に掘削することになる。
【００１４】
なお、図１０〜図１３は前記樹脂製埋設管用の接続部材に関する他の実施例を示したものであり、図１０〜図１２はそれぞれの実施例の片側断面図、図１３は図１２に示した実施例の側面図である。図１０に示した実施例に係る接続部材２０は、前記接続部材６における外嵌部１１に相当する外嵌部２１に螺旋状の溝部２２を形成して、前記ソケット部材８の接合部１２ないし樹脂製埋設管５の接続側端部内面との接着性の向上を図ったものである。また、図１１に示した実施例に係る接続部材２３は、前記接続部材２０の変形例で、その外嵌部２４にリング状の溝部２５を形成したものである。さらに、図１２及び図１３に示した実施例に係る接続部材２６は、その外嵌部２７に軸方向の縦溝２８を形成して、同様に前記ソケット部材８の接合部１２ないし樹脂製埋設管５の接続側端部内面との接着性の向上を図ったものである。
【００１５】
【発明の効果】
本発明によれば、次の効果を得ることができる。
（１）請求項１の発明に係る長尺鋼管先受け工法においては、必要な本数の先受け鋼管により一度削孔打設した後に、最後部の先受け鋼管を樹脂製埋設管に交換するように構成し、先受け鋼管として自穿孔埋設ビット方式を採用したので、自穿孔用ビットを埋め残して回収の手間が省略できるとともに、ビット部分の拡縮機構が不要になることから、地盤に対する先受け鋼管の設置作業の施工性を大幅に改善できるとともに、工事コストの低減にもきわめて有効である。
（２）請求項１の発明に係る長尺鋼管先受け工法においては、最後部の樹脂製埋設管が樹脂製であり鉄分を含まない故に、堀削機により地盤と同時に容易に掘削除去することが可能であり、特別な工具や機械を必要としないので掘削工程が簡略化され作業性が大幅に向上する。
（３）以上のように堀削機により地盤と同時に不要な樹脂製埋設管の突出部分は容易に掘削除去することができるので、従来のように次の先受け鋼管の打設位置を確保するための掘削断面の拡幅と、これに伴う支保工材の拡幅が必要なくなるので、拡幅に伴う覆工コンクリ−トの量も減り、掘削作業の効率化と工事コストの低減が図れる。
（４）請求項２及び請求項３の発明に係る先受け鋼管と樹脂製埋設管との接続手段によれば、前記接続部材とソケット部材との組合せにより、先受け鋼管相互間の連結に使用される連結用部材を用いて簡便かつ強力に接続することができ、自穿孔用ビットによる削孔作業に必要な打撃力及び回転力を的確に伝達することができる。
【図面の簡単な説明】
【図１】本発明に用いられる先受け鋼管の組立前の状態を示した分解組立図である。
【図２】同先受け鋼管の組立状態を示した縦断面図である。
【図３】本発明に用いられる樹脂製埋設管の全体の構成を部分断面して示した分解組立図である。
【図４】同樹脂製埋設管の先受け鋼管との接続部を拡大して示した分解組立図である。
【図５】同樹脂製埋設管の先受け鋼管との接続部の組立状態を示した縦断面図である。
【図６】長尺鋼管先受け工法における削孔打設作業の手順に関する比較例を示した作業説明図である。
【図７】全体の作業状態を示した作業状態図である。
【図８】グラウト材注入作業に関する作業説明図である。
【図９】本発明に係る長尺鋼管先受け工法における削孔打設作業の手順を示した作業説明図である。
【図１０】樹脂製埋設管用の接続部材に関する他の実施例を示した片側断面図である。
【図１１】同接続部材に関する他の実施例を示した片側断面図である。
【図１２】同接続部材に関する他の実施例を示した片側断面図である。
【図１３】図１２に示した実施例の側面図である。
【符号の説明】
１…先受け鋼管、２…自穿孔用ビット、３…支持部材、４…連結用部材、５…樹脂製埋設管、６，７…接続部材、８，９…ソケット部材、１０…連結部、１１…外嵌部、１２…接合部、１３…挿入部、１４…削孔アダプタ、１５…削孔機、１６…注入管、１７…通路、１８…削孔、１９…口元注入管、２０…接続部材、２１…外嵌部、２２…溝部、２３…接続部材、２４…外嵌部、２５…溝部、２６…接続部材、２７…外嵌部、２８…縦溝[0001]
BACKGROUND OF THE INVENTION
Prior to excavation work, the present invention installs a required number of pre-made steel pipes made of long steel pipes around the outer face of the tunnel face to prevent loosening and settlement of the ground in front of the face and to ensure construction safety. It relates to a long steel pipe tip receiving method. More specifically, a long steel pipe adopting a self-piercing embedded bit system in which the self-piercing bit is left as it is while being pierced in the ground while being drilled by the self-piercing bit attached to the tip of the steel pipe. It relates to the receiving method.
[0002]
[Prior art]
Conventionally, pipe roof construction methods and AGF construction methods are known as long steel pipe tip receiving methods, and these methods can be expanded and contracted at the tip of a drilling rod arranged inside the receiving steel pipe. A method is used in which a drilling bit is attached and, if necessary, a suitable number of receiving steel pipes and drilling rods are added and drilled into the ground. When the drilling operation for the ground of the tip receiving steel pipe is completed, the drilling bit is reduced, and the drilling bit together with the drilling rod through the hollow portion inside the tip receiving steel pipe Generally, a method of collecting the grouting material and then injecting a grout material is employed. However, since the above construction method enables the drilling bit to be enlarged / reduced, not only the configuration of the bit itself is complicated, but also the punching bit and the like can be collected through the hollow portion, Since there are structural restrictions such as an increase in the inner diameter of the steel pipe, and the recovery work also takes time, a self-piercing embedded bit system that leaves the drilling bit without being recovered is also disclosed (Japanese Patent Laid-Open No. 11-193687). Issue gazette).
[0003]
Also, in the long steel pipe tip receiving method, when placing the receiving steel pipe, a resin buried pipe is connected to the rearmost end of the steel pipe, and the rearmost end of the receiving steel pipe substantially coincides with the position of the outer circumference of the tunnel cross section. Disclosed is a construction method in which the depth is set, and after filling the grout material between the receiving steel pipe and the ground, the ground of the tunnel cross section is excavated with the resin buried pipe by a drilling machine to form the face. (JP-A-8-121073). However, this conventional construction method employs a method in which a drilling rod is mounted inside the pre-receiver steel pipe and drilled with a drilling bit capable of expanding and contracting diameter attached to the tip of the drilling rod. The mechanism of the entire device is complicated, the connection mechanism with the drifter, etc. is complicated, and it takes time to connect the drilling rod and the receiving steel pipe, and it takes time to collect the drilling bit. there were. If the above-mentioned method using a resin steel pipe is applied to the above self-piercing buried bit method, the strength of the resin buried pipe itself made of vinyl chloride or the like and the connection strength at the connection with the steel pipe are insufficient. There has been a problem that it is technically difficult to transmit a striking force and a rotational force that can be drilled to a drilling bit attached to the tip of the receiving steel pipe. For this reason, a construction method using a resin buried pipe in a long steel pipe tip receiving construction method employing a self-piercing buried bit system is not disclosed.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described conventional technical circumstances, and is configured so that the ground of the tunnel cross section can be excavated together with the buried pipe by the excavator while adopting the self-piercing buried bit method. Therefore, it is intended to improve the workability of the long steel pipe tip receiving method of the tunnel by taking advantage of the work of the self-piercing buried bit method.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention of claim 1 , in the long steel pipe tip receiving method of the tunnel, after completion of the drilling operation for the ground around the tunnel cross section using the tip receiving steel pipe, The steel pipe is pulled out and replaced with a resin buried pipe, and after filling the grout material between the steel pipe and the ground to stabilize the ground in front of the face, the ground of the tunnel cross section is grounded by a excavator. The technical means of excavation with resin buried pipes was adopted. As described above, in the present invention, a technical means is employed in which the drilling operation is performed using only the first receiving steel pipe, and after the completion, the last receiving steel pipe is pulled out and replaced with a resin buried pipe. Therefore, it is possible to reliably transmit the striking force and rotational force required for the self-drilling bit at the tip through the receiving steel pipe, and the excavator can excavate the ground of the tunnel cross section together with the resin buried pipe. Workability as a long steel pipe tip receiving method can be greatly improved.
[0006]
In the invention of claim 2 , when the self-piercing buried bit method is adopted, as a connecting means for connecting the resin buried pipe to the rear end portion of the last received steel pipe, the connection for the first received steel pipe is provided on one side. A connecting member having a connecting portion corresponding to a member for use and having an outer fitting portion having an outer diameter on which the resin-embedded pipe can be fitted on the other side; and an outer fitting portion of the connecting member on one side A connecting portion having an inner diameter that can be externally fitted, and an insertion portion that forms a gap into which the end of the resin buried pipe can be inserted between the outer fitting portion of the connecting member on the other side The socket member is used in the state where the connection side end portion of the resin buried pipe is inserted into the gap formed between the outer fitting portion of the connection member and the insertion portion of the socket member. The outer fitting part of the resin pipe is fitted and fixed together with the insertion end of the resin buried pipe, and the steel pipe Via imaging member employing the technical means that connect the resin buried pipe to the rear end of the preceding receiving steel tube rearmost. In addition, this technical means is effective also when using the resin-made embedding pipe | tube which consists of fiber reinforced resin reinforced with reinforcing fibers, such as glass fiber, carbon fiber, and aramid fiber, like Claim 3 .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be widely applied as long as it is a tunnel long steel pipe tip receiving method using a tip receiving steel pipe. The specific length of the steel pipe for receiving steel is generally 3 or 4 m, but can be changed depending on the case. Further, the number of receiving steel pipes to be connected is set according to the specific situation of the ground or the like, and may be one depending on the situation. Various types of self-drilling bits are applicable. Also, as grout materials, cement-based materials and resin-based materials such as urethane can be used, and grout materials for the gap between the outer peripheral surface of the receiving steel pipe or resin buried pipe and the ground, and the receiving steel pipe It is also possible to use a different type of grout material which is filled inside. Further, as the injection path for injecting the grout material, it is possible to employ a dedicated injection pipe having a required strength made up of the internal space of the receiving steel pipe itself, a vinyl chloride pipe, a polyethylene pipe, a pressure hose and the like.
[0008]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded view showing a pre-assembly state of a pre-receiving steel pipe used in the long steel pipe pre-receiving method according to the present invention, and FIG. 2 is a longitudinal sectional view showing an assembled state of the pre-receiving steel pipe. is there. In the figure, reference numeral 1 denotes a pre-receiver steel pipe, and an external thread is formed on the entire outer peripheral surface thereof. Reference numeral 2 denotes a self-drilling bit attached to the front end of the front-end receiving steel pipe 1, and reference numeral 3 denotes an inner part of the front-end receiving steel pipe, which is installed at a connection portion with the self-drilling bit 2. It is the supporting member of the grout material injection tube to be made. As shown in FIG. 2, each of the receiving steel pipes 1 is configured to be connected by a connecting member 4, and a necessary length is obtained by appropriately connecting a number of the receiving steel pipes 1 according to circumstances. It is comprised so that it can set to. As shown in the drawing, a female screw that can be screwed into a male screw formed on the outer peripheral surface of the receiving steel pipe 1 is formed inside the connecting member 4. The steel pipes 1 are connected to each other. It should be noted that a stopper portion that prevents screwing of the receiving steel pipe 1 is formed by forming a ring-shaped ridge in the middle portion of the female screw formed on the inner surface of the connecting member 4 or by shifting the screw groove. In addition, in the tightened state, the end surfaces of the receiving steel pipes 1 are configured so as to directly contact each other across the stopper portions, so that the rotational force and the striking force acting during drilling can be reliably transmitted. it can. In addition, the injection pipe for grout material installed inside the front receiving steel pipe 1 may be set in advance before placing the front receiving steel pipe 1 on the ground, or may be set after placing. It may be.
[0009]
FIG. 3 is an exploded view showing the entire structure of the resin buried pipe, FIG. 4 is an exploded view showing an enlarged connection portion with the receiving steel pipe, and FIG. 5 is a longitudinal section showing the assembled state. FIG. In the figure, 5 is a resin-made buried pipe made of fiber reinforced resin reinforced with reinforcing fibers such as glass fiber, carbon fiber, and aramid fiber, and connecting members 6 and 7 are connected to socket members 8 and 9 at both ends thereof. The one connecting member 6 is connected to the rear end portion of the last receiving steel pipe 1 and the other connecting member 7 is connected to a device side such as a drilling machine. . And it is common to use what consists of the same structure as those connection members 6 and 7, but at least the connection member 6 on the side connected to the receiving steel pipe 1 is shown in FIGS. As shown, it has a connecting portion 10 formed with a male screw corresponding to a female screw formed inside the connecting member 4 for the receiving steel pipe on one side, and a resin buried pipe 5 on the other side. It has the outer fitting part 11 which consists of an outer diameter which can be fitted. Further, the socket member 8 that forms a pair with the connection member 6 has a joint portion 12 having an inner diameter that can be fitted onto the outer fitting portion 11 of the connection member 6 on one side, and the connection member 6 on the other side. The insertion part 13 which forms the gap | interval which can insert the edge part of the resin-made embedding pipe | tube 5 between the external fitting part 11 is provided. Thus, when the connection member 6 is fixed to the end of the resin buried pipe 5, the connection side end of the resin buried pipe 5 is connected to the outer fitting portion 11 of the connection member 6 and the insertion portion 13 of the socket member 8. The socket member 8 is externally fitted to the external fitting portion 11 of the connecting member 6 while being inserted into the gap formed between the two, and an epoxy resin adhesive or the like is used together with the insertion end portion of the resin buried pipe 5. Can be easily and reliably fixed. The front end surface of the resin buried pipe 5 is brought into contact with the rear end surface of the joint 12 of the socket member 8, and the front end surface of the socket member 8 is fixed in a state of being in contact with the rear end surface of the connecting portion 10 of the connecting member 6. By doing so, it is possible to more accurately transmit the impact force. Note that the connection member 7 can be simply and reliably bonded and fixed to the other end portion of the resin buried pipe 5 by the same method.
[0010]
FIG. 6 is an operation explanatory diagram showing a comparative example regarding the procedure of drilling operation in the long steel pipe tip receiving method , and FIG. 7 is an operation state diagram showing the entire operation state. In this construction method, first, as shown in the state (a) of FIG. 6, a drilling operation is performed in which the first tip receiving steel pipe 1 a is drilled with the self-drilling bit 2. In this case, a cutting end such as a tunnel jumbo shown in FIG. 7 is provided through a drilling adapter 14 in which the rear end of the receiving steel pipe 1a is screwed and connected to a male screw formed on the outer peripheral surface of the receiving steel pipe 1a. The drilling operation is performed by connecting to the hole machine 15 side. Thereafter, as shown in the state (b), the drilling adapter 14 is separated from the threaded portion of the first receiving steel pipe 1a, and a second receiving steel pipe is used by using the connecting member 4 instead. 1b is connected, the hole adapter 14 is screwed to the rear end portion thereof, and a hole forming operation is performed by the hole drilling machine 15. Then, as shown in the state (c), the necessary number, in the present embodiment, one pre-receiver steel pipe 1c is drilled by the same method and added, and the next buried pipe is Resin reinforced with reinforcing fibers at the rear end of the preceding steel pipe 1c corresponding to the last receiving steel pipe at the end when the rear end reaches the stage where it reaches the full length and interferes with the support work As shown in the state (d), the buried pipe 5 is connected by using the connecting member 4, and the same drilling operation is performed. In this case, one end of the resin buried pipe 5 is connected to the receiving steel pipe 1c by the connecting member 4 through the connecting member 6, and the other end is connected by the drilling adapter 14 through the connecting member 7. The drilling operation is performed in a state where it is connected to 15.
[0011]
As described above, when the drilling operation of the predetermined receiving steel pipe 1 and the resin buried pipe 5 is completed, the grout is placed between the receiving steel pipes 1a to 1c or the resin buried pipe 5 and the ground. It shifts to the grout material injection work which filled the material and stabilized the ground in front of the face. As shown in FIG. 8, the grout material injection operation is carried out by pumping the grout material using an injection pipe 16 supported and connected to the support member 3 disposed in the front receiving steel pipe 1a. The mouth injection pipe installed between the mouth of the resin buried pipe 5 at the rearmost part and the inner surface of the hole 18 is made to flow outside through a passage 17 formed in the self-drilling bit 2 portion. 19 via injection. In addition, you may fill grout material also in the space part in the receiving steel pipes 1a-1c as needed. It is also possible to fill the gap with the ground by letting the grout material flow out to the outside through the outflow holes formed in the steel pipes 1a to 1c using the receiving steel pipes 1a to 1c themselves. is there. Thus, when the ground stabilization by the pre-received steel pipe 1 within a predetermined range is completed, the portion of the connecting member 7 bonded and fixed to the rear end portion of the resin buried pipe 5 is removed by cutting or crushing as necessary. At the top, the ground of the tunnel cross section is excavated with the resin buried pipe 5 by the excavator and the work of the support construction is performed. In this excavation work, the resin buried pipe 5 at the end is made of resin and does not contain iron, so it can be easily excavated and removed simultaneously with the ground by a drilling machine and requires special tools and machines. As a result, the excavation process is simplified. Furthermore, since it is not necessary to widen the excavation cross-section for securing the placement position of the next receiving steel pipe 1 and the accompanying support material, it is possible to reduce the amount of lining concrete accompanying the widening, The efficiency of excavation work and the reduction of construction costs can be achieved.
[0012]
FIG. 9 is an operation explanatory view showing the procedure of drilling operation in the long steel pipe tip receiving method according to the embodiment of the present invention . This method is suitable when the ground is hard and drilling is difficult. The procedure in this construction method will be described from the subsequent state (e), since exactly the same drilling operation is performed up to the state (b) in the case of the construction method in the comparative example . In the state (e) in this construction method, unlike the state (c), the desired total length is not obtained by using the resin buried pipe 5 but using the receiving steel pipes 1a to 1d made of steel pipes to the end. To complete the drilling operation. Therefore, in the case of this construction method, since the resin buried pipe does not intervene until the final drilling work of the first receiving steel pipe 1d, more powerful striking force and rotational force can be transmitted. It is extremely effective for hard and difficult drilling.
[0013]
As described above, when the drilling operation for the final receiving steel pipe 1d is completed, as shown in the state (f), the receiving steel pipes 1a to 1d once installed are used for connecting the last part. Pull out until the member 4 is exposed, remove the last receiving steel pipe 1d from the connecting member 4, and instead connect the resin buried pipe 5 as shown in the state (g), Return to the installation position. In this case, it may be simply pushed back to the previously drilled placement position, or if it is difficult to push back due to collapse of the hole wall, etc. You may make it return to the position of. In this operation of returning to the original placement position, since the hole 18 has already been formed in the ground by the previous hole punching operation, it can be returned by a small striking force or rotational force. Therefore, in the case of the embodiment according to the present construction method, the resin buried pipe 5 is not necessarily limited to the one made of the fiber reinforced resin reinforced with the reinforced fiber. When the above return operation is completed, the grout material is filled between the receiving steel pipes 1a to 1c or the resin embedding pipe 5 and the ground as in the case of the construction method, and the front of the face is cut. After the ground is stabilized, the portion of the connecting member 7 bonded and fixed to the rear end of the resin buried pipe 5 is removed by cutting or crushing as necessary, and then the ground of the tunnel cross section by a excavator. Are excavated simultaneously with the resin buried pipe 5.
[0014]
10 to 13 show other embodiments relating to the connecting member for the resin buried pipe. FIGS. 10 to 12 are half sectional views of the respective embodiments, and FIG. 13 is shown in FIG. FIG. The connecting member 20 according to the embodiment shown in FIG. 10 has a spiral groove portion 22 formed in an outer fitting portion 21 corresponding to the outer fitting portion 11 of the connecting member 6, so The adhesiveness with the inner surface of the connection-side end portion of the resin buried pipe 5 is improved. Further, the connection member 23 according to the embodiment shown in FIG. 11 is a modification of the connection member 20 and is formed by forming a ring-shaped groove portion 25 in the outer fitting portion 24 thereof. Further, the connecting member 26 according to the embodiment shown in FIGS. 12 and 13 is formed with an axial longitudinal groove 28 in the outer fitting portion 27, and similarly, the joint portion 12 of the socket member 8 or the resin embedding. The adhesiveness with the inner surface of the connection side end of the tube 5 is improved.
[0015]
【The invention's effect】
According to the present invention, the following effects can be obtained.
( 1 ) In the long steel pipe tip receiving method according to the invention of claim 1, after drilling once with a required number of the receiving steel pipes, the last receiving pipe is replaced with a resin buried pipe. Since the self-piercing embedded bit method is adopted as the receiving steel pipe, it is possible to save the labor of recovery by leaving the self- piercing bit unfilled and eliminate the need for a bit portion expansion / contraction mechanism. In addition to greatly improving the workability of steel pipe installation work, it is extremely effective in reducing construction costs.
( 2 ) In the long steel pipe tip receiving method according to the invention of claim 1 , since the last resin buried pipe is made of resin and does not contain iron, it is easily excavated and removed simultaneously with the ground by a excavator. Since no special tools or machines are required, the excavation process is simplified and workability is greatly improved.
( 3 ) As described above, the excavation portion of the unnecessary resin buried pipe can be easily excavated and removed at the same time as the ground by the excavator, so as to secure the next casting position of the receiving steel pipe as before. For this reason, it is not necessary to widen the excavation section and the accompanying support material, so that the amount of lining concrete accompanying the widening can be reduced, and the efficiency of excavation work and the construction cost can be reduced.
( 4 ) According to the connecting means between the receiving steel pipe and the resin buried pipe according to the inventions of claim 2 and claim 3 , the connecting member and the socket member are used for coupling between the receiving steel pipes. Thus, the connecting member can be simply and strongly connected, and the striking force and the rotational force necessary for the drilling operation by the self-drilling bit can be accurately transmitted.
[Brief description of the drawings]
FIG. 1 is an exploded view showing a state before assembly of a pre-receiver steel pipe used in the present invention.
FIG. 2 is a longitudinal sectional view showing an assembled state of the same steel pipe.
FIG. 3 is an exploded view showing a partial cross section of the entire structure of a resin buried pipe used in the present invention.
FIG. 4 is an exploded view showing an enlarged connection portion between the resin buried pipe and the receiving steel pipe.
FIG. 5 is a longitudinal sectional view showing an assembled state of a connection portion between the resin buried pipe and a tip receiving steel pipe.
FIG. 6 is an operation explanatory view showing a comparative example regarding a procedure for drilling operation in a long steel pipe tip receiving method.
FIG. 7 is a work state diagram showing an overall work state.
FIG. 8 is an operation explanatory diagram related to a grout material injection operation.
9 is a working explanatory view showing a procedure for drilling punch設作industry in engagement Ru elongated steel pipe destination receiving method of the present invention.
FIG. 10 is a one-side cross-sectional view showing another embodiment relating to a connecting member for a resin buried pipe.
FIG. 11 is a half sectional view showing another embodiment relating to the connection member.
FIG. 12 is a half sectional view showing another embodiment relating to the connection member.
13 is a side view of the embodiment shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pre-receiving steel pipe, 2 ... Self-drilling bit, 3 ... Support member, 4 ... Connection member, 5 ... Resin buried pipe, 6, 7 ... Connection member, 8, 9 ... Socket member, 10 ... Connection part, DESCRIPTION OF SYMBOLS 11 ... Outer fitting part, 12 ... Joint part, 13 ... Insertion part, 14 ... Drilling adapter, 15 ... Drilling machine, 16 ... Injection pipe, 17 ... Passage, 18 ... Drilling hole, 19 ... Mouth injection pipe, 20 ... Connection member, 21 ... outer fitting part, 22 ... groove part, 23 ... connection member, 24 ... outer fitting part, 25 ... groove part, 26 ... connection member, 27 ... outer fitting part, 28 ... longitudinal groove

Claims

最前部の先受け鋼管の先端部に自穿孔用ビットを取付け、該自穿孔用ビットを埋め残す自穿孔埋設ビット方式を採用したトンネルの長尺鋼管先受け工法において、先受け鋼管を用いたトンネル断面の周囲の地盤に対する削孔打設作業の終了後、最後部の先受け鋼管を引抜いて樹脂製埋設管に交換し、前記先受け鋼管と地盤の間にグラウト材を充填して切羽の前方の地盤を安定させた後、堀削機によりトンネル断面の地盤を前記樹脂製埋設管と共に掘削することを特徴とするトンネルの長尺鋼管先受け工法。 A tunnel using a pre-receiving steel pipe in a long steel pipe pre-receiving method of a tunnel that employs a self-piercing embedded bit method in which a self-piercing bit is attached to the front end of the front receiving steel pipe and the self-piercing bit is buried After the drilling operation for the ground around the cross section is completed, the last receiving steel pipe is withdrawn and replaced with a resin embedding pipe, and a grout material is filled between the receiving steel pipe and the ground to front the face. A long steel pipe tip receiving method for a tunnel characterized in that, after stabilizing the ground of the tunnel, the ground of the tunnel cross section is excavated with the resin buried pipe by a drilling machine.

最前部の先受け鋼管の先端部に自穿孔用ビットを取付け、該自穿孔用ビットを埋め残す自穿孔埋設ビット方式を採用し、最後部の先受け鋼管の後端部に樹脂製埋設管を接続する接続手段として、一側に前記先受け鋼管用の連結用部材に対応した連結部を有し、かつ他側に前記樹脂製埋設管を外嵌し得る外径からなる外嵌部を形成した接続部材と、一側に前記接続部材の外嵌部に対して外嵌可能な内径からなる接合部を有し、かつ他側に前記接続部材の外嵌部との間に前記樹脂製埋設管の端部を挿入し得る間隙を形成する挿入部を有するソケット部材とを用い、前記樹脂製埋設管の接続側端部を前記接続部材の外嵌部とソケット部材の挿入部との間に形成される間隙部に挿入した状態で、ソケット部材を接続部材の外嵌部に外嵌して前記樹脂製埋設管の挿入端部と共に接着固定した上、前記鋼管用の連結用部材を介して樹脂製埋設管を最後部の先受け鋼管の後端部に接続することを特徴とするトンネルの長尺鋼管先受け工法。 A self-piercing bit is attached to the front end of the front receiving steel pipe, and the self-piercing embedding bit method is used to leave the self-piercing bit buried, and a resin buried pipe is installed at the rear end of the last receiving steel pipe. As a connecting means for connection, an outer fitting portion having an outer diameter that has a connecting portion corresponding to the connecting member for the first receiving steel pipe on one side and can fit the resin buried pipe on the other side is formed. A connecting portion having an inner diameter that can be externally fitted to the external fitting portion of the connection member on one side, and embedded in the resin between the external fitting portion of the connection member on the other side A socket member having an insertion portion that forms a gap into which an end portion of the pipe can be inserted, and connecting the connection side end portion of the resin buried pipe between the outer fitting portion of the connection member and the insertion portion of the socket member. The socket member is externally fitted to the external fitting portion of the connection member in a state of being inserted into the gap portion to be formed. A long steel pipe for a tunnel characterized by being bonded and fixed together with an insertion end of a pipe and connecting a resin buried pipe to a rear end of a last receiving steel pipe via a connecting member for the steel pipe Prior construction method.

前記樹脂製埋設管として、ガラス繊維、カーボン繊維、アラミド繊維等の強化繊維により補強した繊維強化樹脂からなる樹脂製埋設管を用いた請求項１又は２に記載のトンネルの長尺鋼管先受け工法。The long steel pipe tip receiving method for a tunnel according to claim 1 or 2, wherein a resin buried pipe made of fiber reinforced resin reinforced with reinforcing fibers such as glass fiber, carbon fiber, and aramid fiber is used as the resin buried pipe. .