JP3538344B2 - Pipe propulsion machine and pipe propulsion method - Google Patents

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】この出願の発明は、先導体後
端部に埋設管を連結して先導体を推進しつつカッタヘッ
ドで地山を掘削するとともに粘性付与液を掘削土砂へ注
入して塑性流動性のある泥土を生成し、その泥土を先導
体の外周側を通過させる管推進機及びこの管推進機を使
用する管推進工法に関する。BACKGROUND OF THE INVENTION The invention of this application relates to a method of excavating a ground with a cutter head while injecting a buried pipe to a rear end of a leading conductor and propelling the leading conductor, and injecting a viscosity imparting liquid into excavated earth and sand. The present invention relates to a pipe propulsion machine that generates mud having plastic fluidity and passes the mud through the outer peripheral side of a leading conductor, and a pipe propulsion method using the pipe propulsion machine.

【０００２】[0002]

【従来の技術】管を地中に埋設する工法として、管推進
工法と称する工法が従来から知られている。この管推進
工法では、前方にカッタヘッドを設けた先導体の後方に
ヒューム管等で形成した埋設管を順次連結し、これらの
埋設管を発進立坑内に設置した元押し装置で推進しなが
ら前方の地山をカッタヘッドで掘削して先導体で地山を
掘進するとともに、各埋設管を順次地中に押し込んで埋
設して行く方法が常用されている。管推進機は、こうし
た管推進工法を実施するため、先導体と元押し装置とで
構成された装置である。従来一般に用いられているこの
種の管推進機では、埋設管を推進して埋設する際に前部
の地山を圧密しながら埋設管を貫入しなければならず、
埋設管に大きな貫入抵抗が作用するため、出願人は、こ
の貫入抵抗を軽減できるようにした管推進機を先に開発
した。2. Description of the Related Art As a method of burying pipes in the ground, a method called pipe propulsion method has been conventionally known. In this pipe propulsion method, buried pipes formed of fume pipes and the like are sequentially connected to the back of a leading conductor provided with a cutter head in front, and these buried pipes are propelled forward by a main pushing device installed in the starting shaft. In general, a method of excavating the ground with a cutter head, excavating the ground with a leading conductor, and sequentially pushing each buried pipe into the ground to bury the ground is used. The pipe propulsion device is a device configured with a leading conductor and a main pushing device in order to perform such a pipe propulsion method. In this type of pipe propulsion machine generally used in the past, when propelling a buried pipe and burying it, it is necessary to penetrate the buried pipe while compacting the front ground.
Since a large penetration resistance acts on a buried pipe, the applicant has previously developed a pipe propulsion device capable of reducing the penetration resistance.

【０００３】この出願人が開発した管推進機では、先導
体で地山を掘進する際、カッタヘッドで掘削した掘削土
砂に作泥材等の粘性付与液を注入、撹拌混合することに
より塑性流動性のある泥土を生成する。そして、こうし
て生成された泥土を先導体外周の泥土通路を通過させ、
その一部を、先導体の後側に設けた土砂取り込み口から
先導体の内部に取り込んで土砂圧送ポンプ等の排土手段
により地上に圧送するとともに、残りの泥土を先導体後
方の埋設管の外周側に導くようにしている。この管推進
機では、塑性流動性のある泥土を埋設管の外周側に導く
ようにしているため、管推進時における埋設管外周面と
周辺地山との摩擦抵抗を低減して埋設管の貫入抵抗を軽
減することができ、長距離スパンの埋設管の推進を相対
的に低い推進力で行える。こうした管推進機は、人が入
れないような小口径の管を地中に埋設する小口径管推進
機に多用されて、これまで好結果を収めている。In the pipe propulsion device developed by the present applicant, when excavating the ground with a leading conductor, a viscosity imparting liquid such as a sludge material is poured into excavated earth and sand excavated with a cutter head, and the mixture is agitated and mixed. Generates mud with potential. Then, the mud generated in this way is passed through a mud passage on the outer periphery of the leading conductor,
A part of it is taken into the inside of the front conductor through the sediment intake port provided on the rear side of the front conductor, and is pumped to the ground by earth discharging means such as a sediment pressure pump, and the remaining mud is buried in the buried pipe behind the front conductor. It is guided to the outer peripheral side. In this pipe propulsion device, since the plastic fluid mud is guided to the outer peripheral side of the buried pipe, the frictional resistance between the outer peripheral surface of the buried pipe and the surrounding ground during pipe propulsion is reduced to allow the penetration of the buried pipe. Resistance can be reduced, and long-distance span buried pipes can be propelled with relatively low propulsion. Such pipe propulsion machines have been used frequently for small-diameter pipe propulsion machines in which small-diameter pipes that cannot be inserted by human beings are buried underground, and have been successful.

【０００４】本発明は、こうしたタイプの管推進機にお
いて土砂排出経路に詰まった泥土を効果的に除去できる
ように改良しようとするものである。そこで、後に詳述
する本発明の内容の理解を容易にするため、こうしたタ
イプの従来の管推進機の基本的な技術内容を図２及び図
３に基づいて説明する。図２は、従来の管推進機の掘進
時の状態を示す縦断面図、図３は、従来の管推進機の排
土管の洗浄時の状態を示す縦断面図である。[0004] The present invention seeks to improve such a type of pipe propulsion machine so that mud clogged in the earth and sand discharge path can be effectively removed. Therefore, in order to facilitate understanding of the contents of the present invention described later, the basic technical contents of such a conventional pipe propulsion machine will be described with reference to FIGS. FIG. 2 is a vertical cross-sectional view showing a state of the conventional pipe propulsion machine at the time of excavation, and FIG. 3 is a vertical cross-sectional view showing a state of the conventional pipe propulsion machine at the time of cleaning the discharge pipe.

【０００５】これらの図において、１は後方に埋設管１
０を順次連結して地山を掘進する先導体、２は地山を掘
削して掘削孔を形成するカッタヘッド、ａは掘削土砂に
注入し撹拌混合して塑性流動性のある混合物を生成する
ための粘性付与液、３は地上からの粘性付与液ａをカッ
タヘッド２に設けた注入口３ａに供給するためのホース
で形成された粘性付与液供給管、３ａは粘性付与液ａを
掘削土砂に放射状に注入するようにカッタヘッド２に形
成さた注入口、ｂは粘性付与液ａと掘削土砂とが撹拌混
合されて生成された塑性流動性のある泥土、４は先導体
１の外周と掘削孔の孔壁との間に形成された泥土通路、
５は先導体１の後側底部に設けられ泥土通路４を通過し
た泥土ｂの一部を先導体１内に取り込む土砂取り込み
口、６は土砂取り込み口５から取り込んだ泥土ｂを地上
に圧送するための排土装置としての土砂圧送ポンプであ
る。カッタヘッド２は、先導体１や埋設管１０よりも若
干大径の穴を掘削して先導体１や埋設管１０と掘削穴と
の間に環状の泥土通路４を形成し得るように、掘削外径
が定められている。土砂圧送ポンプ６は、泥土ｂをシリ
ンダに取り込んでピストンで排土管９に押し込むことに
より圧送する。In these figures, reference numeral 1 denotes a buried pipe 1 at the rear.
0 is sequentially connected to the leading conductor to excavate the ground, 2 is a cutter head for excavating the ground to form a drill hole, a is injected into excavated earth and sand, and mixed by stirring to produce a plastic fluid mixture. Liquid supply pipe formed by a hose for supplying a liquid viscosity a from the ground to an inlet 3a provided in the cutter head 2, and 3a excavates the viscosity liquid a. An injection hole formed in the cutter head 2 so as to radially inject the fluid, a b is a plastic fluidity mud generated by stirring and mixing the viscosity imparting liquid a and the excavated earth and sand, and 4 is an outer periphery of the leading conductor 1. Mud passage formed between the borehole and the borehole wall,
Reference numeral 5 denotes a sediment intake port provided at the rear bottom portion of the leading conductor 1 to take in a part of the mud b passing through the mud passage 4 into the leading conductor 1, and 6 pressurizes the mud b taken from the sediment intake port 5 to the ground. And earth pressure pump as an earth removal device. The cutter head 2 excavates a hole slightly larger in diameter than the leading conductor 1 and the buried pipe 10 so as to form an annular mud path 4 between the leading conductor 1 and the buried pipe 10 and the drilled hole. The outer diameter is determined. The earth and sand pressure pump 6 pumps the mud b by taking it into a cylinder and pushing it into a discharge pipe 9 with a piston.

【０００６】７は前胴１ａを後胴１ｂに対して連結し傾
動させて先導体１の方向修正を行うための方向修正ジャ
ッキ、８は方向修正時の反力や掘削回転力の反力を地山
に伝達する突起状の反力伝達部材、９は埋設管１０内に
敷設され、土砂圧送ポンプ６で圧送される泥土ｂを発進
立坑３０側に排出する管路となる排土管、１０はヒュー
ム管等で単位長さに製作され先導体１の後端部に連結さ
れて順次継ぎ足される地中埋設用の埋設管、１４は先導
体１内に設置されレーザ発信機１５のレーザ光１６を受
光する位置検出素子等からなる受光装置、１５は発信立
坑内に設置されレーザ光１６を発するレーザ発信機であ
る。Reference numeral 7 denotes a direction correcting jack for connecting and tilting the front trunk 1a with respect to the rear trunk 1b to correct the direction of the front conductor 1, and 8 denotes a reaction force at the time of the direction correction and a reaction force of the excavation rotational force. A projecting reaction force transmitting member 9 for transmitting to the ground is laid in a buried pipe 10, and an earth discharging pipe 10 serving as a conduit for discharging mud b pumped by the earth and sand pressure pump 6 to the starting shaft 30 side. A buried tube for underground burial, which is manufactured to a unit length with a fume tube or the like and connected to the rear end of the leading conductor 1 and successively added, 14 is installed in the leading conductor 1 and receives laser light 16 of a laser transmitter 15. A light receiving device 15 including a position detecting element for receiving light, and the like, a laser transmitter 15 installed in a transmission shaft and emitting a laser beam 16.

【０００７】方向修正ジャッキ７は、先導体１の内周方
向に間隔を置いて複数個設置され、複数個の方向修正ジ
ャッキ７のストローク差により前胴１ａを後胴１ｂに対
して傾動させることができる。ここでは、一例として、
先導体１を前胴１ａと後胴１ｂで分割構成して方向修正
ジャッキ７を設けたいわゆる中折れ式の管推進機を示し
たが、管推進機が中折れ式であることは、本発明にとっ
て不可欠のことではない。反力伝達部材８は、先導体１
の外周壁に周方向に間隔を置いて複数個所に突設すると
ともに前後に配置し、これにより、先導体１を安定した
状態で地山に支持できるようにするとともに泥土通路４
の間隙を十分大きくとることができる。管推進機は、レ
ーザ発信機１５から発せられたレーザ光１６を受光装置
１４で受光してその受光位置を検出することにより、そ
の掘進地点の座標位置を演算により求めることができる
ようになっている。A plurality of direction correcting jacks 7 are provided at intervals in the inner circumferential direction of the leading conductor 1, and the front body 1a is tilted with respect to the rear body 1b due to a stroke difference between the plurality of direction correcting jacks 7. Can be. Here, as an example,
Although the so-called center-bend type tube propulsion device in which the front conductor 1 is divided into the front body 1a and the rear body 1b and the direction correcting jack 7 is provided has been described, the fact that the tube propulsion device is a center-bend type is described in the present invention. Is not indispensable to The reaction force transmitting member 8 includes the tip conductor 1.
Projecting at a plurality of locations on the outer peripheral wall at intervals in the circumferential direction and arranging them forward and backward, so that the leading conductor 1 can be stably supported on the ground and the mud path 4
Can be made sufficiently large. The pipe propulsion device receives the laser beam 16 emitted from the laser transmitter 15 with the light receiving device 14 and detects the light receiving position, whereby the coordinate position of the excavation point can be obtained by calculation. I have.

【０００８】管推進機の他方の構成要素である元押し装
置２０の構造と発進立坑３０の構造について説明する。
２０は先導体１や埋設管１０を推進する元押し装置で、
大別すると、元押しジャッキ２１とフレーム２２と押し
台２３とからなり、管埋設の出発点となる発進立坑３０
に設置される。元押しジャッキ２１は、先導体１や埋設
管１０を推進する。３１は発進立坑３０の発進口周囲に
設けられ発進時に先導体１と発進立坑３０の坑壁との間
をシールしながら先導体１を通過させるようにするため
のエントランスパッキン、３２は発進立坑３０の坑壁を
形成する矢板である。エントランスパッキン５０は、矢
板３２に取り付けられている。The structure of the main pushing device 20 and the structure of the starting shaft 30 which are the other components of the tube propulsion machine will be described.
20 is a main pushing device for propelling the tip conductor 1 and the buried pipe 10,
The starting shaft 30 is composed of a main push jack 21, a frame 22 and a push table 23, and serves as a starting point for burying pipes.
Installed in The main push jack 21 propels the leading conductor 1 and the buried pipe 10. An entrance packing 31 is provided around the starting opening of the starting shaft 30 so as to allow the leading conductor 1 to pass therethrough while sealing between the leading conductor 1 and the pit wall of the starting shaft 30 at the time of starting. It is a sheet pile that forms a wellhead wall. The entrance packing 50 is attached to the sheet pile 32.

【０００９】フレーム２２は、発進立坑３０の床面に設
置され先導体１や埋設管１０を支持する基台２２ａと、
この基台２２ａの後端部に立設され元押しジャッキ２１
を取り付ける支え台２２ｂとからなる。支え台２２ｂ
は、元押しジャッキ２１での先導体１の推進時に発進立
坑３０の坑壁で支持して反力を取れるようにしている。
押し台２３は、底部に複数のローラー２３ａが設けられ
て基台２２ａ上に設置され、埋設管１０の推進方向に前
後に移動できるようになっている。この押し台２３は、
管推進工法の実施時に、先導体１や最後部の埋設管１０
の後端面に当接して前後に移動することにより先導体１
に推進力を付与する。元押しジャッキ２１は、押し台２
３に取り付けられて、伸縮することにより押し台２３を
前後に移動し、これにより、先導体１を推進したり埋設
管１０を継ぎ足したりすることができる。発進立坑３０
側の排土管９に着脱自在に接続でき泥土ｂを地上に導く
元押し排土管９ａが押し台２３に取り付けられている。The frame 22 includes a base 22a installed on the floor of the starting shaft 30 and supporting the leading conductor 1 and the buried pipe 10.
The main push jack 21 is erected at the rear end of the base 22a.
And a support base 22b for attaching the. Support stand 22b
When the main conductor 1 is propelled by the main push jack 21, a reaction force can be obtained by being supported by the pit wall of the starting shaft 30.
The push table 23 is provided on the base 22a with a plurality of rollers 23a provided at the bottom, and can be moved back and forth in the direction in which the buried pipe 10 is propelled. This push table 23
When the pipe propulsion method is implemented, the leading conductor 1 and the buried pipe 10
The front conductor 1
To give propulsion. The original push jack 21 is a push table 2
3, the push table 23 is moved back and forth by expanding and contracting, so that the leading conductor 1 can be propelled and the buried pipe 10 can be added. Start shaft 30
A main push discharge pipe 9a that can be detachably connected to the side discharge pipe 9 and guides the mud b to the ground is attached to the push table 23.

【００１０】次に、以上述べた従来の管推進機の作用に
ついて説明する。いま、元押し装置２０で埋設管１０を
推進しつつカッタヘッド２を回転駆動すると、カッタヘ
ッド２は、切羽を掘削して掘削穴を掘削する。また、こ
うして掘削穴を掘削する過程で、粘性付与液ａが粘性付
与液供給管３を通じてカッタヘッド２の注入口３ａに供
給され、同注入口３ａから半径方向に向けて掘削土砂に
注入される。そうすると、この粘性付与液ａと掘削土砂
とがカッタヘッド２で撹拌混合されて塑性流動性のある
泥土ｂを生成し、この泥土ｂは、環状の泥土通路４内に
圧入、充填されて、一部が土砂取り込み口５から土砂圧
送ポンプ６に取り込まれて排土管９を通じて地上に圧送
されるとともに、残部が埋設管１０と掘削穴との間の環
状の泥土通路４を通過する。その結果、先導体１外周や
埋設管１０外周の泥土通路４を通過する泥土ｂの塑性流
動性によりこれらの貫入抵抗が軽減されるため、埋設管
１０の推進距離が長くなっても、これを円滑に押し込む
ことができる。Next, the operation of the above-described conventional pipe propulsion device will be described. Now, when the cutter head 2 is rotationally driven while the buried pipe 10 is being propelled by the main pushing device 20, the cutter head 2 excavates a face and excavates an excavation hole. In the process of digging the excavation hole, the viscosity-imparting liquid a is supplied to the injection port 3a of the cutter head 2 through the viscosity-imparting liquid supply pipe 3, and injected into the excavated earth and sand from the injection port 3a in the radial direction. . Then, the viscosity imparting liquid a and the excavated earth and sand are agitated and mixed by the cutter head 2 to generate mud b having plastic fluidity. The mud b is pressed into the annular mud passage 4 and filled therein. The part is taken into the earth and sand pump 6 from the earth and sand intake port 5 and is pumped to the ground through the earth discharging pipe 9, and the remainder passes through the annular mud passage 4 between the buried pipe 10 and the excavation hole. As a result, the penetration resistance is reduced by the plastic fluidity of the mud b passing through the mud passage 4 around the outer periphery of the leading conductor 1 and the buried pipe 10, so that even if the propulsion distance of the buried pipe 10 becomes longer, It can be pushed in smoothly.

【００１１】こうして先導体１で地山を掘進して埋設管
１０を押し込む過程において、先導体１の後方に埋設管
１０を順次継ぎ足すとともに、これに伴って、排土管
９、粘性付与液供給管３及び図示していない先導体１へ
の動力供給用ホースや信号用のケーブルを延長する。ま
た、この間、レーザ発信機１５から発せられたレーザ光
１６を受光装置１４で受光してその受光位置を検出する
とともに先導体１の掘進距離を検出することにより、先
導体１の掘進地点の座標位置を演算により逐次求めて行
く。In the process of excavating the ground with the leading conductor 1 and pushing the buried pipe 10 in this way, the buried pipe 10 is successively added to the back of the leading conductor 1 and, along with this, the discharging pipe 9 and the viscosity imparting liquid supply A power supply hose and a signal cable to the pipe 3 and the not-shown leading conductor 1 are extended. During this time, the laser beam 16 emitted from the laser transmitter 15 is received by the light receiving device 14 to detect the light receiving position and the excavation distance of the leading conductor 1 so that the coordinates of the excavating point of the leading conductor 1 are obtained. The position is obtained sequentially by calculation.

【００１２】ところで、管推進機では、前記したよう
に、掘削土砂を泥土化して土砂取り込み口５から先導体
１の内部に取り込んだ後、埋設管１０内の排土管９を通
じて発進立坑３０側に排土する。管推進工法の実施時に
掘削土砂が泥土通路４、土砂取込み口５、排土管９等の
土砂排出経路に詰まって排土が行えなくなると、管推進
工法を中断しなければならなくなるので、従来、掘削土
砂がその排出経路に詰まるのを防ぐための予防措置が講
じられており、その例として、特開平１０ー７７７８５
号公報に記載の管推進技術を挙げることができる。な
お、この公報に記載されている管推進機は、掘削土砂に
水を混合して泥土を生成するようにしているが、その泥
土を埋設管の外周側に導いて埋設管の貫入抵抗を軽減す
るようにしたものではなく、また、掘削土砂の排土方式
も異なっていて、出願人が開発した前記の管推進機とは
別のタイプのものである。By the way, in the pipe propulsion machine, as described above, excavated earth and sand is muddy and taken into the interior of the leading conductor 1 from the earth and sand intake port 5 and then to the starting shaft 30 through the earth discharging pipe 9 in the buried pipe 10. Excavate. When the excavated soil is clogged in the earth and sand discharge path such as the muddy passage 4, the sediment intake port 5, and the discharge pipe 9 when the pipe propulsion method is carried out, the pipe propulsion method has to be interrupted. Precautions have been taken to prevent excavated earth and sand from clogging its discharge path, as disclosed in, for example, JP-A-10-77785.
The pipe propulsion technology described in Japanese Patent Application Laid-Open Publication No. H10-209,086 can be cited. The pipe propulsion device described in this publication generates mud by mixing water with excavated earth and sand, but guides the mud to the outer peripheral side of the buried pipe to reduce the penetration resistance of the buried pipe. However, the method of discharging excavated earth and sand is also different, and is of a different type from the pipe propulsion device developed by the applicant.

【００１３】この管推進機は、前端部にカッタヘッドを
固着したスクリュコンベアを先導体の中心部に設け、土
砂取り込み開口とチャンバとをカッタヘッド内に形成す
るとともに、切羽に水を供給する給水孔と土砂取り込み
開口に近接する個所のチャンバに水を供給する給水孔と
をカッタヘッドに設けるようにしたものである。そし
て、カッタヘッドで切羽を掘削しながら水を給水孔から
切羽に供給することにより掘削土砂を泥土化するととも
に、水を給水孔から、土砂取り込み開口に近接するチャ
ンバ内に供給することにより、掘削土砂を泥土化して土
砂取り込み開口からチャンバ内に取り込み、このチャン
バ内の掘削土砂をスクリュコンベアで後方に搬送して排
土するようにしたものである。この公報に記載の管推進
技術では、特に、水を給水孔から土砂取り込み開口に近
接するチャンバ内に供給して泥土化を促進するようにし
たため、掘削土砂が土砂取り込み開口を通過しやすくな
って掘削土砂による土砂取り込み開口の閉塞を確実に防
止できるとされている。In this pipe propulsion machine, a screw conveyor having a cutter head fixed to the front end is provided at the center of the leading conductor, an earth and sand intake opening and a chamber are formed in the cutter head, and water is supplied to the face. The cutter head is provided with a hole and a water supply hole for supplying water to a chamber adjacent to the sediment intake opening. Then, while excavating the face with the cutter head, the excavated soil is muddy by supplying water to the face from the water supply hole, and the excavation is performed by supplying water from the water supply hole into a chamber adjacent to the sediment intake opening. The soil is muddy and taken into the chamber through a soil intake opening, and the excavated soil in the chamber is conveyed backward by a screw conveyor to discharge the earth. In the pipe propulsion technology described in this publication, in particular, since water is supplied from a water supply hole into a chamber adjacent to the sediment intake opening to promote muddy soil, excavated sediment easily passes through the sediment intake opening. It is said that the blockage of the sediment intake opening due to excavated sediment can be reliably prevented.

【００１４】しかるに、昨今、管推進工法では、管推進
機の性能の向上に伴って施工スパンが著しく長距離化し
たため、土砂排出経路についてこうした閉塞防止の予防
措置を講じるだけでは土砂排出経路の閉塞を確実に防ぐ
ことが困難である。以下、この点について言及する。However, in recent years, in the pipe propulsion method, since the construction span has been remarkably lengthened with the improvement of the performance of the pipe propulsion machine, it is only necessary to take such preventive measures for preventing the sediment discharge path from blocking the sediment discharge path. Is difficult to reliably prevent. Hereinafter, this point will be described.

【００１５】管推進工法では、施工スパンが短いと、一
様の土質の地盤を施工することができるが、施工スパン
が長距離化すると、短距離スパンのように一様の土質の
地盤を施工することはできず、一つの施工スパンで施工
をする過程において、これまで排土が難しいとして敬遠
されていた高礫率の高い（礫の混合比率が高い）地盤と
固結性の高い（粘性が高く付着しやすい）地盤のような
土質の著しく異なる複数種類の地盤を施工せざるを得な
い機会が多くなる。先導体のカッタヘッドは、掘削土砂
と粘性付与液とを撹拌混合して泥土を生成するため、掘
削性能だけでなく撹拌性能も考慮して土質に最適なもの
を選択する必要があるが、このように施工する地盤の土
質が著しく変化する場合には、土質に最適の撹拌性能を
有するカッタヘッドを選択することは難しいため、排土
しやすい泥土を常に生成することは困難になる。また、
泥土による土砂排出経路の閉塞は、泥土の流れの最も悪
い個所で徐々に進展して行くが、長距離スパンの施工で
は、それだけ施工時間が長いため、こうした土砂排出経
路の閉塞が発生しやすくなり、前記したような排土の難
しい土質では、土砂排出経路の閉塞がなおさら発生しや
すくなる。こうしたことから、長距離スパンの施工で
は、前記のような閉塞防止の予防措置によっては土砂排
出経路の閉塞を確実に防ぐことができず、土砂排出経路
が泥土により閉塞した場合の対策が重要な問題となって
いる。[0015] In the pipe propulsion method, if the construction span is short, the ground with uniform soil can be constructed. However, if the construction span becomes long, the ground with uniform soil like short span can be constructed. In the process of constructing in one construction span, the ground with a high gravel rate (high mixing ratio of gravel), which has been shunned in the past as difficult to remove soil, has a high solidification (viscosity) There are many opportunities to construct a plurality of types of grounds with significantly different soil properties such as ground, which tends to adhere easily. The cutter head of the tip conductor mixes the excavated earth and sand with the viscosity-imparting liquid to generate mud, so it is necessary to select not only the excavation performance but also the stirring performance in consideration of the optimum one for the soil quality. When the soil quality of the ground to be constructed changes remarkably as described above, it is difficult to select a cutter head having the optimum stirring performance for the soil quality, and it is difficult to always generate mud which is easily discharged. Also,
The blockage of the sediment discharge route due to mud gradually progresses at the worst part of the mud flow, but in the case of long-distance span construction, such blockage of the sediment discharge route is likely to occur because the construction time is long. On the other hand, when the soil is difficult to discharge as described above, blockage of the earth and sand discharge path is more likely to occur. For this reason, in the construction of a long distance span, it is not possible to reliably prevent the sediment discharge path from being blocked by the above-described preventive measures for preventing blockage, and it is important to take measures when the sediment discharge path is blocked by mud. Has become a problem.

【００１６】このように土砂排出経路が閉塞すると、排
土不能になって管推進工法を実施することができなくな
るため、排土管等の土砂排出経路を洗浄して復旧を図
る。そこで、こうした土砂排出経路を洗浄する方法につ
き、従来出願人が実施していた方法を、図３を用いて説
明する。排土管９が敷設されている埋設管１０の中は、
狭くて作業員が入れず、連結した排土管９同士を埋設管
１０内で切り離す作業が容易には行えないため、排土管
９の切離し作業は発進立坑３０内で行う。図３には、発
進立坑３０側の排土管９と元押し排土管９ａとの連結を
解いた後、元押しジャッキ２１を縮めて押し台２３を後
退させることにより、元押し排土管９ａを後退させて発
進立坑３０側の排土管９を元押し排土管９ａから切離し
た例が示されている。こうして発進立坑３０側の排土管
９を切り離してその端部９ｂを開放したら、その開放さ
れた排土管９の端部９ｂから長尺の洗浄用のホース１７
を差し込んでホース１７により洗浄液ｄを注入し、排土
管９内の閉塞泥土ｃを洗浄して除去する。このように、
従来は、排土管９内の閉塞泥土ｃを発進立坑３０側から
長尺のホース１７で洗浄する方法が採られていた。If the earth and sand discharge path is blocked as described above, the earth cannot be discharged and the pipe propulsion method cannot be carried out. Therefore, the earth and sand discharge path such as the earth discharging pipe is cleaned and restored. The method of cleaning the earth and sand discharge path, which has been conventionally performed by the applicant, will be described with reference to FIG. In the buried pipe 10 where the discharge pipe 9 is laid,
Since the work is difficult to cut off the connected discharge pipes 9 in the buried pipe 10 because the work is not so narrow and the worker cannot enter, the separation work of the discharge pipes 9 is performed in the starting shaft 30. In FIG. 3, after the connection between the discharge pipe 9 on the starting shaft 30 side and the main discharge pipe 9 a is released, the main push jack 21 is contracted and the push table 23 is retracted, so that the main discharge pipe 9 a is retracted. An example is shown in which the discharging pipe 9 on the starting shaft 30 side is separated from the main discharging pipe 9a. When the discharge pipe 9 on the starting shaft 30 side is cut off and its end 9b is opened in this way, a long cleaning hose 17 is opened from the opened end 9b of the discharge pipe 9.
And the washing liquid d is injected by the hose 17 to wash and remove the closed mud c in the discharge pipe 9. in this way,
Conventionally, a method has been adopted in which the closed mud c in the discharge pipe 9 is washed from the start shaft 30 side with a long hose 17.

【００１７】[0017]

【発明が解決しようとする課題】しかしながら、こうし
た従来の技術では、発進立坑３０側の排土管９の端部９
ｂから洗浄用のホース１７を挿入して洗浄液ｄを注入す
るようにしていたため、ホース１７から注入される洗浄
液ｄが届く範囲でしか閉塞泥土ｃを洗浄することができ
ない。そのため、発進立坑３０近くの排土管９内に詰ま
った閉塞泥土ｃについては洗浄を行うことができても、
先導体１の掘進が進展した状態において先導体１側の土
砂排出経路に閉塞泥土ｃが発生したときには、その閉塞
泥土ｃを洗浄することが困難になる。特に、先導体１の
土砂取り込み口５の付近や排土管９の入口付近は、泥土
ｂが閉塞しやすい個所であるが、先導体１の掘進が進展
した状態でこうした個所に閉塞泥土ｃが発生したときに
は、閉塞土砂ｃを除去することができなくなるため、排
土不能になって、管推進工法が実施できなくなる。その
ため、管推進機の推進を途中で断念して、先導体１、埋
設管１０、排土管９等を回収した後、管推進機の推進を
やり直さなければならないケースもある。こうしたケー
スでは、多大の経費と時間がかかるだけでなく、その
間、地表の陥没を防ぐための地盤沈下の防止にも配慮す
る必要があるため、管推進工事の施工者に多大の負担が
かかることとなる。However, in such a conventional technique, the end 9 of the discharge pipe 9 on the starting shaft 30 side is not provided.
Since the cleaning liquid d is injected by inserting the cleaning hose 17 from b, the closed mud c can be cleaned only within a range where the cleaning liquid d injected from the hose 17 reaches. Therefore, even if the closed mud c clogged in the discharge pipe 9 near the starting shaft 30 can be cleaned,
When the clogging mud c is generated in the earth and sand discharge path on the side of the leading conductor 1 in a state where the excavation of the leading conductor 1 has progressed, it becomes difficult to clean the clogged mud c. In particular, the vicinity of the sediment intake port 5 of the leading conductor 1 and the vicinity of the entrance of the discharge pipe 9 are locations where the mud b is likely to be clogged. In this case, the clogged soil c cannot be removed, so that it becomes impossible to discharge the soil and the pipe propulsion method cannot be performed. Therefore, in some cases, it is necessary to give up the propulsion of the pipe propulsion machine and to restart the propulsion of the pipe propulsion machine after collecting the leading conductor 1, the buried pipe 10, the discharging pipe 9, and the like. In such a case, not only is it costly and time-consuming, but also during that time, it is necessary to consider the prevention of land subsidence to prevent the surface from sinking, which places a great burden on the pipe propulsion construction builder It becomes.

【００１８】本発明は、こうした従来の管推進技術にみ
られる問題を解消しようとするものであって、その技術
課題は、泥土が土砂排出経路に詰まって排土が不能にな
ったときにその排土の不能を効果的に解消することがで
きる管推進技術を提供することにある。The present invention is intended to solve the problems encountered in such conventional pipe propulsion techniques. The technical problem is that when mud is clogged in the earth and sand discharge path and the discharge becomes impossible, the problem is solved. It is an object of the present invention to provide a pipe propulsion technique capable of effectively eliminating the inability to discharge soil.

【００１９】[0019]

【課題を解決するための手段】前記の技術課題を解決す
るための手段として、この出願の管推進機に係る発明で
は次の１）の手段を採用し、この出願の管推進工法に係
る発明では次の２）の手段を採用した。Means for Solving the Problems As means for solving the above technical problems, the invention relating to the tube propulsion device of this application employs the following 1) means, and the invention relating to the tube propulsion method of this application. Then, the following method 2) was adopted.

【００２０】１）前方にカッタヘッドを設け内部に粘性
付与液供給管を有する先導体を備え、先導体後方に埋設
管を順次連結してその埋設管の推進により先導体を推進
しつつカッタヘッドで地山を掘削するとともに、粘性付
与液供給管に供給した粘性付与液を切羽の掘削土砂へ注
入して塑性流動性のある泥土を生成し、その泥土を先導
体の外周側を通過させた後に先導体に取り込んで埋設管
内の排土管を通じて排土する管推進機において、粘性付
与液供給管から分岐させた少なくとも一つの洗浄用の分
岐管と、粘性付与液供給管を前記分岐管に連通させるよ
うに流路を選択的に切り換えることのできる流路切換手
段とを設けて、流路切換手段で流路を切り換えることに
より、粘性付与液供給管から供給した粘性付与液、水等
の洗浄液を、前記分岐管を通じて泥土が詰まりやすい個
所に注入し得るようにする。1) A cutter conductor is provided in front of a cutter head and a viscosity-imparting liquid supply pipe is provided therein. A buried pipe is sequentially connected to the rear of the tip conductor, and the cutter head is propelled by propelling the buried pipe. In addition to excavating the ground with, the viscosity imparting liquid supplied to the viscosity imparting liquid supply pipe was injected into the excavated earth and sand of the face to generate mud with plastic fluidity, and the mud was passed through the outer periphery of the leading conductor In a pipe propulsion device that is later taken into a leading conductor and discharged through a discharging pipe in a buried pipe, at least one branch pipe for cleaning branched from a viscosity-imparting liquid supply pipe and a viscosity-imparting liquid supply pipe are connected to the branch pipe. Flow path switching means capable of selectively switching the flow path so as to cause the flow path to be switched by the flow path switching means, thereby providing a cleaning liquid such as a viscosity-imparting liquid or water supplied from a viscosity-imparting liquid supply pipe. And the So that mud can be injected into the clogged easy to place through the branch pipes.

【００２１】２）前記１）の管推進機を使用して管推進
工法を実施し、管推進工法の実施時に泥土が排土不能に
なったときに、粘性付与液、水等の洗浄液を粘性付与液
供給管から供給し、洗浄用の分岐管を通じて泥土が詰ま
りやすい個所に注入する第１の過程と、第１の過程によ
り泥土の排土不能が解消されなかったときに、発進立坑
側の排土管の端部から洗浄用の管を挿入して洗浄用の管
により粘性付与液、水等の洗浄液を注入する第２の過程
とを経て泥土の排土不能を解消するようにする。2) When the pipe propulsion method is carried out using the pipe propulsion device of the above 1), and when the mud cannot be discharged during the execution of the pipe propulsion method, the viscous imparting liquid and the cleaning liquid such as water are viscous. A first step of supplying the liquid from the application liquid supply pipe and injecting it into a place where mud is likely to be clogged through a branch pipe for washing; and, when the inability to discharge the mud has not been eliminated by the first step, A second step of inserting a cleaning pipe from the end of the discharging pipe and injecting a cleaning liquid such as a viscosity-imparting liquid or water through the cleaning pipe to eliminate the inability to discharge the mud.

【００２２】前記１）の手段を採用したこの出願の管推
進機に係る発明では、その管推進機を使用して管推進工
法を実施している場合において泥土が排土不能になった
ときに、粘性付与液供給管を洗浄用の分岐管に連通させ
るように流路を切換弁により切り換えるとともに、粘性
付与液、水等の洗浄液を粘性付与液供給管から供給す
る。そうすると、粘性付与液供給管から供給された洗浄
液は、洗浄用の分岐管に流れて、この分岐管を通じて泥
土が詰まりやすい個所に注入され、土砂排出経路を洗浄
する。このように、本発明では、泥土が詰まりやすい個
所の周辺を重点的に洗浄するようにしているため、排土
が不能になったときにその排土の不能を効果的に解消す
ることができ、また、その洗浄作業は、切換弁を操作す
ることにより行えて簡便に行える。In the invention relating to the pipe propulsion apparatus of this application employing the above-mentioned means 1), when the pipe propulsion method is performed using the pipe propulsion method and the mud cannot be discharged, The flow path is switched by the switching valve so that the viscosity-imparting liquid supply pipe communicates with the branch pipe for cleaning, and a cleaning liquid such as a viscosity-imparting liquid and water is supplied from the viscosity-imparting liquid supply pipe. Then, the cleaning liquid supplied from the viscosity-imparting liquid supply pipe flows into the branch pipe for cleaning, and is injected into a portion where mud is easily clogged through the branch pipe, thereby cleaning the earth and sand discharge path. As described above, in the present invention, since the area around the place where mud is likely to be clogged is mainly washed, it is possible to effectively eliminate the inability of discharging when the discharging becomes impossible. The cleaning operation can be performed easily by operating the switching valve.

【００２３】前記２）の手段を採用したこの出願の管推
進工法に係る発明では、前記の管推進機を使用して第１
の過程を実施するので、以上述べた作用を当然奏する。
発進立坑側の排土管の端部から洗浄用の管を挿入して行
う第２の過程の作業は、手間を要する面倒な作業である
が、本発明では、第１の過程により泥土が詰まる可能性
の高い個所の洗浄を先行させて行ない、それでも、泥土
の排土不能が解消されなかったときに、初めて、そうし
た手間を要する第２の過程の作業を行うようにしている
ので、土砂排出経路に詰まった泥土の除去作業は、無駄
な作業負担を軽減して合理的に行える。In the invention according to the pipe propulsion method of this application employing the above-mentioned means 2), the first method is performed by using the above-described pipe propulsion machine.
Thus, the above-described operation is naturally achieved.
The work of the second step performed by inserting the pipe for washing from the end of the discharge shaft on the starting shaft side is troublesome and time-consuming work. However, in the present invention, the mud can be clogged by the first step. Since the high-potential cleaning is performed in advance, and even if the inability to discharge the mud is not eliminated, the work of the second step that requires such labor is performed only for the first time. The work to remove the mud clogged in can be done rationally by reducing unnecessary work load.

【００２４】[0024]

【発明の実施の形態】以下、この出願の管推進機に係る
発明及び管推進工法に係る発明が実際上どのように具体
化されるのかを示す具体化例を図１に基づいて説明する
ことにより、この出願の各発明の実施の形態を明らかに
する。図１は、この出願の管推進機の発明に関する具体
化例を示す縦断面図で、管推進機の排土管を洗浄してい
るときの状態を示す図ある。図１において、図２及び図
３と同一符号を付けた部分は、これらの図と同等の部分
を表すので、詳述しない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention relating to the tube propulsion device and the invention relating to the tube propulsion method of this application will be described below with reference to FIG. In the following, embodiments of each invention of this application will be clarified. FIG. 1 is a longitudinal sectional view showing a specific example of the invention of the pipe propulsion device of the present application, and is a diagram showing a state when the discharge pipe of the pipe propulsion device is being washed. In FIG. 1, portions denoted by the same reference numerals as those in FIGS. 2 and 3 represent portions equivalent to those in FIGS.

【００２５】図１の管推進機は、前方にカッタヘッド２
を設け内部に粘性付与液供給管３を有する先導体１を備
え、先導体１後方に埋設管１０を順次連結して元押し装
置２０での埋設管１０の推進により先導体１を推進しつ
つカッタヘッド２で地山を掘削するとともに、粘性付与
液供給管３に供給した粘性付与液ａを切羽の掘削土砂へ
注入して塑性流動性のある泥土ｂを生成し、その泥土ｂ
を先導体１の外周側の泥土通路４を通過させた後、泥土
ｂを土砂圧送ポンプ６により土砂取り込み口５から先導
体１に取り込んで埋設管１０内の排土管９を通じて排土
する管推進機である点において、図２及び図３に示す従
来の管推進機と変わらない。The pipe propulsion device shown in FIG.
Is provided with a leading conductor 1 having a viscosity-imparting liquid supply pipe 3 therein. The leading conductor 1 is propelled by propulsion of the buried pipe 10 by the main pushing device 20 by sequentially connecting the buried pipes 10 behind the leading conductor 1. The ground is excavated with the cutter head 2, and the viscosity imparting liquid a supplied to the viscosity imparting liquid supply pipe 3 is injected into the excavated earth and sand of the face to generate mud b having plastic fluidity.
Is passed through the mud passage 4 on the outer peripheral side of the leading conductor 1, and then the mud b is taken into the leading conductor 1 from the sediment inlet 5 by the earth and sand pump 6 and discharged through the discharging pipe 9 in the buried pipe 10. It is the same as the conventional pipe propulsion machine shown in FIGS.

【００２６】そこで、図１の管推進機の特徴的な技術内
容を説明する。図１において、１１は粘性付与液供給管
３から分岐させた洗浄用の分岐管、１２は粘性付与液供
給管３を洗浄用の分岐管１１に連通させるように流路を
選択的に切り換えることのできる流路切換手段としての
切換弁、ｄは閉塞土砂ｃを除去するための、粘性付与
液、水等の洗浄液である。洗浄用の分岐管１１は、洗浄
液ｄを泥土の閉塞しやすい個所に注入する働きをする
が、ここに示す例では、こうした分岐管１１を粘性付与
液供給管３から２本ほど分岐させている。そして、その
一方は、土砂取り込み口５の付近に洗浄液ｄを注入でき
るように注入口を位置させており、他方は、排土管９の
入口付近に洗浄液ｄを注入できるように注入口を位置さ
せている。これら土砂取り込み口５の付近や排土管９の
入口付近は、この種の管推進機において泥土が通常最も
閉塞しやすい個所であるが、洗浄用の分岐管１１は、こ
うした個所だけに限らず、当該管推進機の構造上の特質
からみて泥土が閉塞しやすいとみられる任意の個所に洗
浄液ｄを注入できるように設けることができる。こうし
た分岐管１１は、当該管推進機の構造によっては一本設
けてもよい。Therefore, the characteristic technical contents of the tube propulsion device of FIG. 1 will be described. In FIG. 1, reference numeral 11 denotes a cleaning branch pipe branched from the viscosity-imparting liquid supply pipe 3, and reference numeral 12 selectively switches a flow path so that the viscosity-imparting liquid supply pipe 3 communicates with the cleaning branch pipe 11. And d is a cleaning liquid such as a viscosity-imparting liquid or water for removing the clogged soil c. The branch pipe 11 for cleaning functions to inject the cleaning liquid d into a portion where mud is likely to be blocked. In the example shown here, about two such branch pipes 11 are branched from the viscosity-imparting liquid supply pipe 3. . One of the inlets is positioned so that the cleaning liquid d can be injected near the sediment intake port 5, and the other one is positioned so that the cleaning liquid d can be injected near the inlet of the discharge pipe 9. ing. The vicinity of the sediment intake port 5 and the vicinity of the entrance of the discharge pipe 9 are the places where mud is usually most likely to be clogged in this type of pipe propulsion machine, but the branch pipe 11 for washing is not limited to such a location. In view of the structural characteristics of the pipe propulsion device, it can be provided so that the washing liquid d can be injected into any location where mud is likely to be blocked. One such branch pipe 11 may be provided depending on the structure of the pipe propulsion device.

【００２７】洗浄用の分岐管１１には、その注入口から
洗浄液ｄを注入する際に流速を高めてより効果的な閉塞
泥土ｃの洗浄が行えるように，注入口に特にノズルを設
けるとよい。切換弁１２は、ここに示す例では、その切
換操作により粘性付与液供給管３を洗浄用の分岐管１１
に連通させるように流路を切り換えたときに、洗浄液ｄ
が２本の分岐管１１にだけ供給されるように構成されて
いる。しかしながら、切換弁１２は、その切換操作によ
り流路を切り換えたときに、洗浄液ｄを２本の分岐管１
１のほか、カッタヘッド２の注入口３ａ側にも供給でき
るように構成して、先導体１の前方から泥土通路４に送
れるようにしてもよい。切換弁１２は、その切換操作を
遠隔操作により発進立坑３０側から行えるものにする。
ここに示す例では、１個の切換弁１２により、粘性付与
液供給管３を洗浄用の２本の分岐管１１に連通させ得る
ようにしているが、切換弁１２は各分岐管１１に設けて
各分岐管１１ごとに個別的に洗浄液ｄを供給できるよう
にしてもよい。また、切換弁１２に代えて、粘性付与液
供給管３の注入口３ａ側と各分岐管１１とにそれぞれ開
閉弁を設けてもよく、要は、粘性付与液供給管３を洗浄
用の分岐管１１に連通させるように流路を選択的に切り
換えることのできる流路切換手段とを設けるようにすれ
ばよい。The cleaning branch pipe 11 is preferably provided with a nozzle particularly at the injection port so as to increase the flow rate when the cleaning liquid d is injected from the injection port and to perform more effective cleaning of the closed mud c. . In the example shown here, the switching valve 12 changes the viscosity-imparting liquid supply pipe 3 to the cleaning branch pipe 11 by the switching operation.
When the flow path is switched so as to communicate with the
Is supplied only to the two branch pipes 11. However, when the flow path is switched by the switching operation, the switching valve 12 supplies the cleaning liquid d to the two branch pipes 1.
Alternatively, the feed may be supplied to the inlet 3a side of the cutter head 2 so that the cutter head 2 can be fed to the mud passage 4 from the front of the leading conductor 1. The switching valve 12 allows the switching operation to be performed from the starting shaft 30 side by remote control.
In the example shown here, one switching valve 12 allows the viscosity-imparting liquid supply pipe 3 to communicate with the two branch pipes 11 for cleaning, but the switching valve 12 is provided in each branch pipe 11. The cleaning liquid d may be individually supplied to each branch pipe 11. Further, in place of the switching valve 12, on-off valves may be provided on the side of the inlet 3a of the viscosity-imparting liquid supply pipe 3 and on each of the branch pipes 11, respectively. What is necessary is just to provide a flow path switching means capable of selectively switching the flow path so as to communicate with the pipe 11.

【００２８】このような構造を備えた管推進機では、こ
れを使用して管推進工法を実施している過程で泥土ｂの
排出が著しく減少したり途絶えたりする等、泥土ｂが排
土不能になったときに、地上の粘性付与液貯溜タンクに
連結されていた粘性付与液供給管３を洗浄液貯溜タンク
に連結するとともに、切換弁１２を切換操作することに
より、粘性付与液供給管３を洗浄用の分岐管１１に連通
させるように流路を切り換えて粘性付与液、水等の洗浄
液ｄを粘性付与液供給管から供給する。その場合、ここ
に示す例では、図１に示すように、元押し排土管９ａを
元押しジャッキ２１で後退させることにより、発進立坑
３０側の排土管９を元押し排土管９ａから切離してその
排土管９の端部９ｂを開放しておくようにしている。排
土管９の端部９ｂをこのように開放することにより、洗
浄液ｄに洗い流された閉塞泥土ｃを排土管９の端部９ｂ
から発進立坑３０内に排出させることができて、元押し
排土管９ａを通じて地上に排出する場合に比べて閉塞泥
土ｃを排出しやすくなる。洗浄液ｄは、閉塞泥土ｃが粘
性の高い土砂の場合にはこれが土砂排出経路に付着しな
いように粘性のない水を用い、閉塞泥土ｃが砂礫質の場
合には粘性付与液を用いてその排出を容易にする。In the pipe propulsion device having such a structure, the mud b cannot be discharged, for example, the discharge of the mud b is remarkably reduced or interrupted in the process of using the pipe propulsion method. At this time, the viscosity-imparting liquid supply pipe 3 connected to the ground-level viscosity-imparting liquid storage tank is connected to the cleaning liquid storage tank, and the switching valve 12 is operated to switch the viscosity-imparting liquid supply pipe 3. The flow path is switched so as to communicate with the cleaning branch pipe 11, and a cleaning liquid d such as a viscosity-imparting liquid or water is supplied from the viscosity-imparting liquid supply pipe. In this case, in the example shown here, as shown in FIG. 1, the main discharge jack 9 a is retracted by the main push jack 21, so that the discharge pipe 9 on the starting shaft 30 side is separated from the main press discharge pipe 9 a. The end 9b of the discharging pipe 9 is opened. By opening the end 9b of the discharging pipe 9 in this way, the closed mud c washed out by the cleaning liquid d is removed from the end 9b of the discharging pipe 9.
Can be discharged into the starting shaft 30, and the closed mud c can be discharged more easily than when discharged to the ground through the main pushing discharge pipe 9a. The cleaning liquid d uses non-viscous water so that it does not adhere to the sediment discharge path when the blocking mud c is highly viscous earth and sand, and uses a viscosity-imparting liquid when the closing mud c is gravelly. To facilitate.

【００２９】洗浄液ｄを粘性付与液供給管３から供給す
ると、洗浄液ｄは、洗浄用の２本の分岐管１１にそれぞ
れ流れて、各分岐管１１を通じて、泥土ｂが詰まりやす
い土砂取り込み口５付近や排土管９の入口付近に注入さ
れてこれらの個所を洗浄し、これらの個所に閉塞泥土ｃ
が発生している場合に、これを洗い流して除去すること
ができる。この管推進機では、このように泥土ｂが詰ま
りやすい個所の周辺を重点的に洗浄するようにしている
ため、排土が不能になったときにその排土の不能を効果
的に解消することができる。また、その洗浄作業は、従
来行っていたような、長尺の洗浄用のホース１７を地上
から発進立坑３０側の排土管９の端部９ｂに差し込む面
倒な作業を必要とせず、切換弁１２を操作することによ
り行えてきわめて簡便に行える。When the cleaning liquid d is supplied from the viscosity-imparting liquid supply pipe 3, the cleaning liquid d flows into the two branch pipes 11 for cleaning, and passes through the respective branch pipes 11 near the sediment inlet 5 where mud b is easily clogged. And near the inlet of the discharge pipe 9 to clean these places, and to close these places with the closed mud c.
If any has occurred, it can be washed out and removed. In this pipe propulsion device, since the area around the place where the mud b is easily clogged is mainly washed as described above, it is possible to effectively eliminate the inability to discharge when the discharge becomes impossible. Can be. Further, the cleaning work does not require the troublesome work of inserting a long cleaning hose 17 from the ground into the end 9b of the earth discharging pipe 9 on the starting shaft 30 side, which is conventionally performed, and does not require the switching valve 12. The operation can be performed very easily.

【００３０】泥土の排土不能は、多くの場合、こうした
洗浄作業を行うことにより解消されるが、もし、泥土の
排土不能がこうした作業により解消されなかったときに
は、発進立坑３０に比較的近い排土管９内に閉塞泥土ｃ
が詰まっていると考えられるので、図３に示す従来の方
法と同様、発進立坑３０側の排土管９の端部９ｂから洗
浄用の管１７を挿入して管１７により洗浄液ｄを注入
し、排土管９内の閉塞泥土ｃを洗浄して除去する。この
出願の管推進工法に係る発明は、前記の洗浄作業により
泥土の排土不能が解消されなかったときに、このように
発進立坑３０側の排土管９の端部９ｂから洗浄用の管１
７を挿入して管１７により粘性付与液、水等の洗浄液を
注入ようにして泥土の排土不能を確実に解消するように
したものである。長尺の洗浄用の管１７を地上から発進
立坑３０側の排土管９の端部９ｂに挿入する作業は、手
間を要する面倒な作業であるが、この管推進工法では、
洗浄用の分岐管１１による洗浄作業により泥土ｂが詰ま
る可能性の高い個所の洗浄を先行させて行ない、それで
も、泥土ｂの排土不能が解消されなかったときに、初め
て、そうした手間を要する作業を行うようにしているの
で、土砂排出経路に詰まった泥土の除去作業は、無駄な
作業負担を軽減して合理的に行える。The inability to discharge the mud is often eliminated by performing such a washing operation. However, if the inability to discharge the mud is not eliminated by such an operation, it is relatively close to the starting shaft 30. Closed mud c in the discharge pipe 9
It is considered that the cleaning liquid d is injected from the end 9b of the earth discharging pipe 9 on the starting shaft 30 side, and the cleaning liquid d is injected through the pipe 17, as in the conventional method shown in FIG. The closed mud c in the discharge pipe 9 is washed and removed. The invention according to the pipe propulsion method of this application is to clean the pipe 1 for cleaning from the end 9b of the dump pipe 9 on the starting shaft 30 side when the inability to discharge mud is not eliminated by the above-mentioned cleaning work.
7 is inserted, and a cleaning liquid such as a viscosity-imparting liquid and water is injected through a pipe 17 so as to reliably prevent the mud from being discharged. Inserting the long washing pipe 17 from the ground into the end 9b of the earth removal pipe 9 on the starting shaft 30 side is troublesome and time-consuming, but in this pipe propulsion method,
The cleaning operation using the branch pipe 11 for cleaning is performed prior to the cleaning of a place where the mud b is likely to be clogged. However, when the inability to discharge the mud b has not been eliminated, such work is required only for the first time. Therefore, the work of removing the mud clogged in the earth and sand discharge path can be performed rationally by reducing unnecessary work load.

【００３１】洗浄液ｄを泥土が詰まりやすい個所に注入
する場合、洗浄液の供給管路を別途設けて注入できるよ
うにするのが常識的な方法であるが、以上述べた管推進
機や管推進工法では、洗浄液ｄを粘性付与液供給管１１
から供給するようにしていて粘性付与液供給管１１を洗
浄液の供給管路に兼用するようにしたので、本来敷設す
ることが必要な洗浄液の供給管路を省略することができ
て、洗浄液の供給管路を敷設したり、その管路を先導体
１の掘進に伴って延長したりするための作業負担を要し
ないとともに、先導体１内の手狭な空間を狭めるような
こともない。そのため、レーザ発信機１５のレーザ光１
６を受光装置１４で受光してその受光位置を検出する場
合に、洗浄液の供給管路を別途設けた場合のようにレー
ザ光１６を通過させる空間を狭めてしまうという不利益
も生じない。When the cleaning liquid d is injected into a place where mud is likely to be clogged, it is a common sense method to provide a separate supply pipe for the cleaning liquid so that the cleaning liquid can be injected. Then, the cleaning liquid d is supplied to the viscosity-imparting liquid supply pipe 11.
And the viscosity-imparting liquid supply pipe 11 is also used as the cleaning liquid supply pipe, so that the supply pipe of the cleaning liquid that must be laid can be omitted, and the supply of the cleaning liquid can be omitted. It does not require a work load for laying a pipeline or extending the pipeline along with the excavation of the leading conductor 1, and does not narrow a narrow space in the leading conductor 1. Therefore, the laser light 1 of the laser transmitter 15
When the light receiving device 6 is received by the light receiving device 14 and its light receiving position is detected, there is no disadvantage that a space through which the laser light 16 passes is narrowed unlike a case where a supply pipe for the cleaning liquid is separately provided.

【００３２】[0032]

【発明の効果】以上の説明から明らかなように、この出
願の管推進機に係る発明及び管推進工法に係る発明は、
それぞれ、「課題を解決する手段」の項の１）の手段及
び２）の手段を採用しているので、本発明によれば、泥
土が土砂排出経路に詰まって排土が不能になったときに
その排土の不能を効果的に解消することができる管推進
技術が得られる。特に、前記の管推進機に係る発明で
は、洗浄液を粘性付与液供給管から供給するようにして
いて粘性付与液供給管を洗浄液の供給管路に兼用するよ
うにしたので、本来敷設することが必要な洗浄液の供給
管路を省略することができて、洗浄液の供給管路を敷設
したり先導体の掘進に伴って延長したりするための作業
負担を要しないとともに、先導体内の手狭な空間を狭め
るようなこともない。また、土砂排出経路の洗浄作業
は、切換弁を操作することにより行えてきわめて簡便に
行える。前記の管推進工法に係る発明では、第１の過程
により泥土が詰まる可能性の高い個所の洗浄を先行させ
て行ない、手間を要する第２の過程の作業は、第１の過
程の成果みながら行うようにしているので、土砂排出経
路に詰まった泥土の除去作業は、無駄な作業負担を軽減
して合理的に行える。As is apparent from the above description, the invention relating to the pipe propulsion device and the invention relating to the pipe propulsion method of this application are as follows.
According to the present invention, when the mud is clogged in the earth and sand discharge path and the soil cannot be discharged, since the means of 1) and the means of 2) in the section of "means for solving the problem" are respectively adopted. Further, a pipe propulsion technique capable of effectively eliminating the inability to discharge the soil can be obtained. In particular, in the invention related to the above-described pipe propulsion device, the cleaning liquid is supplied from the viscosity-imparting liquid supply pipe, and the viscosity-imparting liquid supply pipe is also used as the cleaning liquid supply pipe. The required supply line for the cleaning liquid can be omitted, eliminating the burden of laying the supply line for the cleaning liquid or extending it along with the excavation of the leading conductor, and the narrow space in the leading conductor. There is no such thing as narrowing. In addition, the operation of cleaning the earth and sand discharge path can be performed by operating the switching valve, and can be performed extremely easily. In the invention relating to the pipe propulsion method, the first step is to perform cleaning of a portion where mud is likely to be clogged in advance, and the work of the second step which requires time is performed while the result of the first step is obtained. Since the work is performed, the work of removing mud clogged in the earth and sand discharge path can be performed rationally by reducing unnecessary work load.

【図面の簡単な説明】[Brief description of the drawings]

【図１】この出願の管推進機の発明に関する具体化例を
示す縦断面図で、管推進機の排土管を洗浄しているとき
の状態を示す図である。FIG. 1 is a longitudinal sectional view showing a concrete example of a tube propulsion device according to the present invention, showing a state in which an exhaust pipe of the tube propulsion device is being washed.

【図２】従来の管推進機の掘進時の状態を示す縦断面図
である。FIG. 2 is a longitudinal sectional view showing a state in which a conventional pipe propulsion machine excavates.

【図３】従来の管推進機の排土管の洗浄時の状態を示す
縦断面図である。FIG. 3 is a longitudinal sectional view showing a state of a conventional pipe propulsion device at the time of cleaning an exhaust pipe.

【符号の説明】[Explanation of symbols]

１ 先導体 ２ カッタヘッド ３ 粘性付与液供給管 ３ａ 注入口 ４ 泥土通路 ５ 土砂取り込み口 ６ 土砂圧送ポンプ ９ 排土管 ９ａ 元押し排土管 １０ 埋設管 １１ 洗浄用の分岐管 １２ 切換弁 ２０ 元押し装置 ３０ 発進立坑 ａ 粘性付与液 ｂ 泥土 ｃ 閉塞土砂 ｄ 洗浄液 1 tip conductor 2 cutter head 3 Viscosity imparting liquid supply pipe 3a Inlet 4 Mud passage 5 Sediment intake 6 earth and sand pressure pump 9 Discharge pipe 9a Main drain pipe 10 Buried pipe 11 Branch pipe for washing 12 switching valve 20 Main pushing device 30 Starting shaft a Viscosity imparting liquid b mud c Closed earth and sand d Cleaning solution

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.⁷，ＤＢ名) E21D 9/12 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 9/12

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 前方にカッタヘッドを設け内部に粘性付
与液供給管を有する先導体を備え、先導体後方に埋設管
を順次連結してその埋設管の推進により先導体を推進し
つつカッタヘッドで地山を掘削するとともに、粘性付与
液供給管に供給した粘性付与液を切羽の掘削土砂へ注入
して塑性流動性のある泥土を生成し、その泥土を先導体
の外周側を通過させた後に先導体に取り込んで埋設管内
の排土管を通じて排土する管推進機において、粘性付与
液供給管から分岐させた少なくとも一つの洗浄用の分岐
管と、粘性付与液供給管を前記分岐管に連通させるよう
に流路を選択的に切り換えることのできる流路切換手段
とを設けて、流路切換手段で流路を切り換えることによ
り、粘性付与液供給管から供給した粘性付与液、水等の
洗浄液を、前記分岐管を通じて泥土が詰まりやすい個所
に注入し得るようにしたことを特徴とする管推進機。1. A cutter head provided with a cutter head at the front and a viscosity-imparting liquid supply pipe inside, and a buried pipe is sequentially connected to the rear of the tip conductor, and the cutter head is propelled by propelling the buried pipe. In addition to excavating the ground with, the viscosity imparting liquid supplied to the viscosity imparting liquid supply pipe was injected into the excavated earth and sand of the face to generate mud with plastic fluidity, and the mud was passed through the outer periphery of the leading conductor In a pipe propulsion device that is later taken into a leading conductor and discharged through a discharging pipe in a buried pipe, at least one branch pipe for cleaning branched from a viscosity-imparting liquid supply pipe and a viscosity-imparting liquid supply pipe are connected to the branch pipe. Flow path switching means capable of selectively switching the flow path so as to cause the flow path to be switched by the flow path switching means, thereby providing a cleaning liquid such as a viscosity-imparting liquid or water supplied from a viscosity-imparting liquid supply pipe. The branch A pipe propulsion machine characterized by being able to inject mud through a pipe into a place where clogging is likely to occur. 【請求項２】 請求項１記載の管推進機を使用する管推
進工法であって、管推進工法の実施時に泥土が排土不能
になったときに、粘性付与液、水等の洗浄液を粘性付与
液供給管から供給し、洗浄用の分岐管を通じて泥土が詰
まりやすい個所に注入する第１の過程と、第１の過程に
より泥土の排土不能が解消されなかったときに、発進立
坑側の排土管の端部から洗浄用の管を挿入して洗浄用の
管により粘性付与液、水等の洗浄液を注入する第２の過
程とを経て泥土の排土不能を解消するようにしたことを
特徴とする管推進工法。2. A pipe propulsion method using the pipe propulsion device according to claim 1, wherein when muddy soil cannot be discharged during execution of the pipe propulsion method, a cleaning liquid such as a viscosity-imparting liquid or water is removed. A first step of supplying the liquid from the application liquid supply pipe and injecting it into a place where mud is likely to be clogged through a branch pipe for washing; and, when the inability to discharge the mud has not been eliminated by the first step, The second step of inserting a cleaning pipe from the end of the discharging pipe and injecting a cleaning liquid such as a viscosity-imparting liquid and water through the cleaning pipe to eliminate the inability to discharge the mud. Characteristic pipe propulsion method.