JPS5862293A - Simultaneous back filling material injection apparatus of tunnel drilling machine - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は、シールド工法における掘削坑と覆工セグメン
トの間に生じた間隙部に対する裏込材をトンネル掘削機
の掘進と同時に、そのテール部から直接に注入するシー
ルド工法におけるトンネル掘削機の裏込材注入装置に関
するものである。従来、シールド工法により構築される
トンネルでは、トンネル掘削機の外殻に沿ってトンネル
が掘削され、その掘削坑の内側に鋼製、またはコンクリ
ート製のセグメントを組立てて覆工する作業が行われて
いるｂこの覆工用セグメントは、トンネル掘削機のテー
ル部にて組立てられるものであるから、掘削坑とセグメ
ントの外径の間にはシールド外殻の厚さとセグメントの
組立てのための余裕間隙との合計された寸法の隙間が残
される。このようなテールボイドは長時間放置しておく
と、地山に弛みが生じて地盤の沈下現象を詞発し、セグ
メントにも偏圧を生ぜしめることになる。このため、こ
のテールボイドへ速やかに裏込材を注入して間隙を充填
する必要がある。しかし、従来のテールボイドに対する
裏込材注入作業は、セグメントに設けられた注入口を利
用して行われておりこの場合のトンネル掘削機の掘進後
の裏込材注入可能な最小長は、グラウト注入口間の寸法
、即ちセグメント７９２７分である。また１一般にトン
ネル掘削機の掘進速度は、セグメン）／リング当り３０
分〜１時間程度であるのに対して、軟弱地盤では数分〜
１０数分で地山に弛みが生じ沈下現象を起す。したがっ
て、掘削推進後に可能な限り速やかに裏込材注入を行っ
て地山の弛みを防止する必要がある。しかし、従来はセ
グメントのグラウト注入口からの裏込材注入が行われて
いるため、トンネル掘削機がセグメン）／リング分だけ
掘進しないと裏込操作が不可能であり、テールボイドが
形成されても速やかに裏込作業ができず、これに伴う地
下の沈下現象など種々の問題点があった。このため、ト
ンネル掘削機の外殻テール部に裏込材注入管を設け、同
時に注入する方法が行なわれているが、裏込材がトンネ
ル掘削機のテール部に付設した注入管内で硬化するため
、最後には従来方式により裏込材の注入を行なっている
。本発明は、上述の問題点を解決して、トンネル掘削機
の外殻テニル部に付設した裏込材注入管により裏込材の
注入終了後、裏込材注入管内の裏込材の固結を防止して
、トンネル掘削機の掘進と同時にテールボイドに裏込材
の注入を可能とする装置を目的とする。以下、本発明の
実施例を図面に基づいて説明する。第１図は本発明によ
る装置の縦断面図である。図において、トンネル掘削機
本体ｌのテール部２の外周側に保護管３内に裏込材注入
管ｌを挿入した二重管を頂部、または頂部および適所に
複数分配して付設し、裏込材注入管ダの先端は機体ｌの
後方のテール部２に開口し、外周はシール５にて保持さ
れ、前記注入管ダの後部は注入管ｌの長さよりや＼長い
ストロークを有するシリンダ部ｔを形成し、ピストン７
が最後退した位置の手前に機体ｌ内に設けた洗浄水排出
管ｌと分岐した裏込材注入枝管９と連結し、シリンダ部
乙のピストン７の直後とシールＩＯの間隙部に洗浄水注
水管／／を連結する。トンネル掘削機ｌによりセグメン
ト２２の７リングの一部分（例えばｌＯ〜３０ＣＩ＋の
巾）を掘進すると同時に裏込材注入枝管９のバルブを開
放して裏込材注入管ｌよりテール部２に裏込材を注入し
ながら掘進してセグメント２２を組立てる。次に、裏込
材注入管ｑを洗浄するには、裏込材注入枝管９のバルブ
を閉じ、ピストン７を裏込材注入管ｌ内の先端まで嵌挿
させた後、洗浄水注水管ＩＩと洗浄水排出管ｒのバルブ
を開放して洗浄水注水管／／より洗浄水を注水しながら
スクレーノぐ−と栓とを兼用させたピストン６を後退さ
せれば、裏込材は洗浄水排出管ざより排出され裏込材注
入管ｑ内は洗浄されて裏込材の固結を防止することがで
きる。したがって、トンネル掘削機本体ｌの掘進を行う
と同時にテール部２に裏込材を注入することができる。DETAILED DESCRIPTION OF THE INVENTION The present invention is a shield construction method in which a backfill material is directly injected into the gap created between the excavation hole and the lining segment from the tail of the tunnel excavator at the same time as the tunnel excavator excavates. This invention relates to a backfill material injection device for a tunnel excavator. Conventionally, in tunnels constructed using the shield method, a tunnel is excavated along the outer shell of a tunnel excavation machine, and steel or concrete segments are assembled and lined inside the excavation shaft. Since this lining segment is assembled at the tail of the tunnel excavation machine, there is a gap between the outer diameter of the excavation hole and the segment for the thickness of the shield outer shell and for the assembly of the segment. A gap with the summed dimensions of is left. If such tail voids are left unattended for a long time, the ground will loosen, causing ground subsidence, and creating uneven pressure in the segments. Therefore, it is necessary to promptly inject a backfilling material into the tail void to fill the gap. However, conventional injection of backfilling material into tail voids is performed using an injection port provided in the segment, and in this case, the minimum length that can be injected with backfilling material after excavation by a tunnel excavator is The dimension between the inlets is 7927 minutes. 1 In general, the excavation speed of a tunnel excavator is 30 per segment)/ring.
The average time is about 1 minute to 1 hour, whereas in soft ground it takes several minutes to 1 hour.
After about 10 minutes, the ground becomes loose and subsidence occurs. Therefore, it is necessary to inject backfilling material as soon as possible after excavation to prevent loosening of the ground. However, conventionally, backfilling material is injected from the grout inlet of the segment, so backfilling is impossible unless the tunnel excavator excavates the length of the segment/ring. There were various problems such as the inability to carry out backfilling work promptly and the underground subsidence caused by this. For this reason, a method is used in which a backfilling material injection pipe is installed in the tail of the outer shell of the tunnel excavation machine and injected at the same time, but the backfilling material hardens in the injection pipe attached to the tail of the tunnel boring machine. Finally, the backfilling material is injected using the conventional method. The present invention solves the above-mentioned problems and solidifies the backfilling material in the backfilling material injection pipe after the injection of the backfilling material is completed by the backfilling material injection pipe attached to the outer shell tenil part of the tunnel excavation machine. The purpose of the present invention is to provide a device that enables a tunnel excavator to inject backfilling material into the tail void simultaneously with excavation by preventing the above. Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a longitudinal sectional view of the device according to the invention. In the figure, a double pipe in which a backfilling material injection pipe 1 is inserted into a protective tube 3 is attached to the outer circumferential side of the tail part 2 of the tunnel excavator main body 1 at the top, or in multiple distributions at the top and appropriate places, and The tip of the material injection pipe opens into the rear tail part 2 of the machine body l, the outer periphery is held by a seal 5, and the rear part of the injection pipe has a cylinder part t having a stroke slightly longer than the length of the injection pipe l. and piston 7
is connected to the cleaning water discharge pipe l provided inside the machine body l and the branched backfilling material injection branch pipe 9 before the position where it is most retracted. Connect the water injection pipe //. A portion of the 7 rings of the segment 22 (for example, a width of 10 to 30CI+) is excavated by the tunnel excavator 1, and at the same time, the valve of the backfilling material injection branch pipe 9 is opened, and the backfilling material is injected into the tail portion 2 from the backfilling material injection pipe 1. The segments 22 are assembled by digging while injecting material. Next, to clean the backfilling material injection pipe q, close the valve of the backfilling material injection branch pipe 9, insert the piston 7 into the backfilling material injection pipe l up to its tip, and then open the cleaning water injection pipe. II and the valves of the wash water discharge pipe r are opened, and while injecting wash water from the wash water inlet pipe//, the piston 6, which serves as a screw nozzle and a stopper, is retreated, the backfilling material is filled with wash water. The backfill material is discharged from the discharge pipe and the inside of the backfill material injection pipe q is cleaned to prevent the backfill material from solidifying. Therefore, the backfilling material can be injected into the tail portion 2 at the same time as the tunnel excavator main body 1 excavates.

第２図は本発明の他の実施例の縦断面図であり１第３図
はＡ部詳細図である。図においてトンネル掘削機本体／
のテール部２の外周側に洗浄水注水管として使用される
保護管ｌｌ内に裏込材注入管／コを挿入して二重管とし
て、頂部、または頂部および全周の適所に複数分配して
付設し、裏込材注入管１２の先端には、貫通孔／４１を
下部に穿設した裏込材注入部材２３を一体に嵌着すると
共に、保護管ｉｉと裏込材注入部材２３の先端部はシー
ル／３にて気密に保持され、後端はシリンダ／ｊのピス
トンロッド１６と連結し、かつ洗浄水排出管１７と分岐
した裏込材注入枝管ｔｔｒが連結されている。ピストン
１９が最後退した位置の和に保護管ｌ／と洗浄水注水枝
管２０を連結させ、裏込材注入管／？の先端に設けられ
た連通溝２１を前記貫通孔ｌＩＩに連通させる。裏込材
の注入には、シリンダｌｊを前進させて裏込材注入管１
２の先端下部の貫通孔／ψをテール部２内に突出させ、
裏込材注入枝管／Ｉのバルブを開放させて裏込材ｉ注入
すればよい。次に、裏込材の洗浄にはシリンダｉｓを最
後退させ裏込材注入管１２の貫通孔、ｌを保護管／／内
に後退させると共に、裏込材注入枝管／ざのバルブを閉
じて洗浄水注水管２０および洗浄水排出管／７のバルブ
を開放し、洗浄水を保護管ｌｌ内に注水すれば、連通溝
コ／を経由して貫通孔ｌＩｌより裏込材注入管ン２に貫
流、循環して洗浄することにより、管内の裏込材の固結
は防止される。したがって、トンネル掘削機ｌの掘進と
同時にテール部２に裏込材を注入してセグメント２２は
組立てられる。本発明による裏込材注入管、保護管およ
び洗浄水排出管はトンネル内に装備された裏込材供給装
置および洗浄水供給、排出装置に連結された圧送管（図
示しない）に接続され、処理されるものであって、上記
の説明の通り、本発明によれば、トンネル掘削機のテー
ル部に掘進と同時に裏込材を注入して、順次セグメント
を組立てることが可能となり、従来の裏込材の注入工法
に比較して連続して裏込材の注入作業輪が可能であるか
ら、裏込材の適正な凝結時間に応じて安全かつ効率の良
い作業が得られる。FIG. 2 is a longitudinal sectional view of another embodiment of the present invention, and FIG. 3 is a detailed view of section A. In the figure, the tunnel excavator body/
A backfilling material injection pipe is inserted into the protection pipe ll used as a washing water injection pipe on the outer circumferential side of the tail part 2 of the pipe, and a plurality of backfilling material injection pipes are distributed at the top or at appropriate locations around the top and the entire circumference as a double pipe. A backfilling material injection member 23 with a through hole 41 formed at the bottom thereof is integrally fitted to the tip of the backfilling material injection pipe 12, and the protective tube ii and the backfilling material injection member 23 are connected to each other. The front end is held airtight by a seal /3, and the rear end is connected to the piston rod 16 of the cylinder /j, and is also connected to a cleaning water discharge pipe 17 and a branched backfilling material injection branch pipe ttr. Connect the protection pipe l/ and the cleaning water injection branch pipe 20 to the sum of the most retracted positions of the piston 19, and connect the backfilling material injection pipe /? A communication groove 21 provided at the tip of the through-hole III is communicated with the through-hole III. To inject the backfilling material, move the cylinder lj forward and insert the backfilling material injection pipe 1.
The through hole /ψ at the bottom of the tip of 2 protrudes into the tail part 2,
It is sufficient to open the valve of the backfilling material injection branch pipe/I and inject the backfilling material i. Next, to clean the backfilling material, the cylinder IS is retracted to the end, the through hole and l of the backfilling material injection pipe 12 are retreated into the protective tube, and the valve of the backfilling material injection branch pipe is closed. When the valves of the cleaning water injection pipe 20 and the cleaning water discharge pipe /7 are opened and the cleaning water is injected into the protection pipe 11, the backfilling material injection pipe 20 passes through the communication groove 11 and enters the through hole 111. By flowing through and circulating the pipe for cleaning, caking of the backing material inside the pipe is prevented. Therefore, the segment 22 is assembled by injecting backing material into the tail portion 2 at the same time as the tunnel excavator 1 excavates. The backfill material injection pipe, protection pipe, and wash water discharge pipe according to the present invention are connected to a pressure feed pipe (not shown) connected to a backfill material supply device and a wash water supply and discharge device installed in the tunnel. As explained above, according to the present invention, it is possible to assemble segments sequentially by injecting backfilling material into the tail portion of a tunnel excavator at the same time as the tunnel is being excavated. Compared to the material injection method, it is possible to continuously inject the backfill material, so safe and efficient work can be achieved depending on the appropriate setting time of the backfill material.

更に、この裏込材注入作業はトンネル掘削機の圧力流体
の供給を掘進と同時に一定の距離を掘進すると、裏込材
注入部および洗浄水注水部の各バルブの開閉を自動的に
作動するように構成して自動制御を行うことも可能とな
り、一層の効果を有する。Furthermore, in this backfilling material injection work, when the tunnel excavator excavates the tunnel by supplying pressurized fluid at the same time as digging a certain distance, the valves in the backfilling material injection part and the cleaning water injection part are automatically opened and closed. It is also possible to perform automatic control by configuring the system as shown in FIG.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図および第２図は本発明による実施例の縦断面図、
第３図は第２図のＡ、部の詳細図である。 ｌ：トンネル掘削機 ２：テール部 ｓ、ｉｉ：保護管 ＩＡ／２：裏込材注入管 Ｓ、ｔＯ：シール Ａ、／３ニジリンダ ７、／９：ピストン と１７：洗浄水排出管 ９、／ｌｒ：裏込材注入枝管 １４コＯ：洗浄水注水管 １３：シール ／ＩＩ：貫通孔 ｌｔ：ロッド ２／：連通溝 コ２：セグメント ２３：裏込材注入部材1 and 2 are longitudinal sectional views of an embodiment according to the present invention,
FIG. 3 is a detailed view of section A in FIG. 2. l: Tunnel excavator 2: Tail part s, ii: Protection tube IA/2: Backfilling material injection pipe S, tO: Seal A, /3 Niji cylinder 7, /9: Piston and 17: Washing water discharge pipe 9, / lr: Backfilling material injection branch pipe 14 O: Washing water injection pipe 13: Seal/II: Through hole lt: Rod 2/: Communication groove 2: Segment 23: Backfilling material injection member

Claims (2)

【特許請求の範囲】[Claims] （１）トンネル掘削機の外殻テール部の外周側に保護管
内に裏込材注入管を挿入した二重管を頂部、または頂部
および全周の適所に複数分配して付設し、裏込材注入管
の先端は機体後方のテール部に開口し、後方はシリンダ
を形成し、シリンダのピストンが最後退した位置の手前
に機体内に設けた洗浄水排出管と分岐した裏込材注入枝
管と連結し、かつシリンダ内のピストン直後とシールの
間隙部に洗浄水注水管を連結すると共に、裏込材を注入
後、シリンダを作動させてピストンを裏込材注入管内に
嵌挿させて管内の裏込材を洗浄、排出することを特徴と
するトンネル掘削機の同時−込材注入装署(1) A double pipe with a backfilling material injection pipe inserted into a protective tube is attached to the outer circumferential side of the outer shell tail of the tunnel excavation machine at the top, or in multiple locations at appropriate locations on the top and the entire circumference, and the backfilling material is The tip of the injection pipe opens at the tail section at the rear of the fuselage, and the rear part forms a cylinder, and the backfilling material injection branch pipe branches into the cleaning water discharge pipe installed inside the fuselage before the piston of the cylinder is retracted the most. At the same time, connect the cleaning water injection pipe to the gap immediately after the piston in the cylinder and the seal, and after injecting the backfilling material, operate the cylinder and insert the piston into the backfilling material injection pipe. Simultaneous fill material injection station for tunnel excavation machine characterized by cleaning and discharging backfill material. （２）トンネル掘削機の外殻テール部の外周側に保護管
内に裏込材注入管ン挿入した二重管を頂部または頂部お
よび全周の適所に複数分配して付設し裏込材注入管の先
端には貫通孔を下部に穿設した裏込材注入部材を一体に
嵌着し、後端には貫通孔を下部に穿設した裏込材注入部
材を一体に嵌着し、後端にはシリンダのピストンロッド
と連結し機体内に設けた洗浄水排出管と分岐した裏込材
注入枝管を連結しかつピストンが最後退した位置の手前
に保護管に洗浄水注水管を連結してシリンダを作動させ
て裏込材注入管を突出させて裏込材を注入後、再び裏込
材注入管を後退させて裏込材注入管の先端下部に設けた
連通溝に貫通孔を連通させ洗浄水を注入して管内の裏込
材を洗浄、排出することを特徴とするトンネル堀削機の
同時裏込材注入装置。(2) On the outer circumferential side of the tail part of the outer shell of the tunnel excavation machine, a double pipe with a backfilling material injection tube inserted into the protective tube is attached to the top or in multiple locations at appropriate locations on the top and the entire circumference. A backfilling material injection member with a through hole drilled at the bottom is integrally fitted to the tip of the , and a backfilling material injection member with a through hole drilled at the bottom is integrally fitted to the rear end. Connect the piston rod of the cylinder and connect the cleaning water discharge pipe provided inside the machine with the branched backing material injection branch pipe, and connect the cleaning water injection pipe to the protection pipe before the piston is at its most retracted position. After operating the cylinder to project the backfilling material injection tube and injecting the backfilling material, move the backfilling material injection tube back again to connect the through hole to the communication groove provided at the bottom of the tip of the backfilling material injection tube. A simultaneous backfilling material injection device for a tunnel excavator, characterized in that the backfilling material in the pipe is washed and discharged by injecting cleaning water.