JP3253544B2 - Bent tube propulsion machine - Google Patents
Bent tube propulsion machineInfo
- Publication number
- JP3253544B2 JP3253544B2 JP33215196A JP33215196A JP3253544B2 JP 3253544 B2 JP3253544 B2 JP 3253544B2 JP 33215196 A JP33215196 A JP 33215196A JP 33215196 A JP33215196 A JP 33215196A JP 3253544 B2 JP3253544 B2 JP 3253544B2
- Authority
- JP
- Japan
- Prior art keywords
- bit
- cutter head
- roller
- hole wall
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ローラビットをロ
ーラビット取付ホルダーにより取り付けたカッタヘッド
と、傾動させることのできる前部と、埋設管を接続する
ことのできる後部と、添加材注入手段とを有する先導体
とを備え、埋設管の埋設過程で、添加材を掘削土砂に注
入して塑性流動性のある混合物を生成し、その混合物を
先導体や埋設管と掘削穴との間の間隙に充填する中折れ
式の管推進機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter head in which a roller bit is mounted by a roller bit mounting holder, a front portion capable of tilting, a rear portion capable of connecting a buried pipe, and an additive injection means. In the process of burying the buried pipe, the additive is injected into the excavated earth and sand to produce a mixture having plastic fluidity, and the mixture is filled with the gap between the leading conductor and the buried pipe and the drilled hole. The present invention relates to a bent-tube type pipe propulsion machine for filling a pipe.
【０００２】[0002]
【従来の技術】直径８００ｍｍ以下の小口径の管を地中
に埋設する工法として、管推進工法と称する工法が従来
から一般に知られている。この管推進工法は、カッタヘ
ッドを有する先導体の後方にヒューム管等で構成した埋
設管を順次連結し、これらの埋設管を発進立坑内に設置
した元押しジャッキで推進しながら前方の地山を先導体
で掘削して、各埋設管を順次地中に押し込んで埋設して
行く工法である。管推進機は、こうした管推進工法を実
施するため、先導体と元押しジャッキとで構成された装
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ないため、埋設管
に大きな貫入抵抗が作用する。2. Description of the Related Art As a method of embedding a small-diameter pipe having a diameter of 800 mm or less in the ground, a method called a pipe propulsion method has been generally known. In this pipe propulsion method, buried pipes composed of fume pipes and the like are sequentially connected to the back of a tip conductor having a cutter head, and these buried pipes are propelled by a main push jack installed in a starting shaft, while the ground in front of the pipe is grounded. Is excavated with a leading conductor, and each buried pipe is pushed into the ground one by one and buried. The pipe propulsion device is a device configured with a leading conductor and a main push jack in order to carry out such a pipe propulsion method. With this type of pipe propulsion device, which is generally used in the past, when buried pipes are propelled and buried, they must penetrate the buried pipes while consolidating the ground at the front. Works.
【０００３】こうしたことから、出願人は、埋設管を貫
入する際、前部の地山を埋設管よりもやや大径に掘削す
るとともに、掘削土砂に粘性付与液としての添加材を注
入、撹拌混合し、その結果生成された泥土状の混合物
を、地山の掘削孔と埋設管との間の環状隙間に充填し
て、埋設管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。さらに、出願人は、こうした管推進機
を多様な施工現場に適応できるように改良して、大礫層
や玉石混じりの地山等硬質の地山でも施工できる管推進
機を開発した。この管推進機は、硬質地盤切削用のロー
ラビッドをローラビッド取付けホルダーを介してカッタ
ヘッドに取り付けるようにしたものである。管推進機に
は、方向修正ジャッキを操作することにより先導体の前
部を傾動させて、埋設管をカーブさせながら地中に埋設
して行くいわゆる曲線施工をすることのできる中折れ式
の管推進機がある。本発明は、出願人が改良を進めた以
上のような管推進機のうちの中折れ式の管推進機につい
て、更に改良しようとするものである。[0003] For this reason, when penetrating a buried pipe, the applicant excavates the ground in front of the buried pipe to a slightly larger diameter than the buried pipe, and at the same time, injects an additive as a viscosity-imparting liquid into the excavated soil and agitates. Mixing, the resulting muddy mixture is filled into the annular gap between the excavation hole in the ground and the buried pipe, and the pipe propulsion device that can reduce the penetration resistance of the buried pipe first developed. Furthermore, the applicant has improved such a pipe propulsion machine so as to be adaptable to various construction sites, and has developed a pipe propulsion machine that can be constructed even on a hard ground such as a boulder layer or a rocky ground. In this tube propulsion device, a roller bid for cutting hard ground is mounted on a cutter head via a roller bid mounting holder. The pipe propulsion machine is a bent-type pipe that can be buried underground while operating the direction correction jack to tilt the front part of the leading conductor and curve the buried pipe under the ground. There is a thruster. The present invention seeks to further improve a bent-type tube propulsion device among the above-described tube propulsion devices improved by the applicant.
【０００４】そこで、こうした中折れ式の管推進機の一
例を従来技術として示し、その基本的な技術内容を図５
乃至図８を用いて説明する。図５は、従来の中折れ式の
管推進機における先導体の部分の全体構造を概略的に示
す水平断面図、図６は、従来の中折れ式の管推進機にお
けるカッタヘッド部の正面図、図７は、従来の中折れ式
の管推進機の方向修正時の作用を説明するための図５の
要部を拡大して示す水平断面図、図８は、図７に示す方
向修正時の従来の中折れ式の管推進機におけるカッタヘ
ッド部の状態を拡大して示す水平断面図である。Accordingly, an example of such a bent-tube type pipe propulsion device is shown as a prior art, and its basic technical contents are shown in FIG.
This will be described with reference to FIGS. FIG. 5 is a horizontal cross-sectional view schematically showing the entire structure of a leading conductor portion in a conventional center-fold type tube propulsion machine, and FIG. 6 is a front view of a cutter head portion in the conventional center-fold type tube propulsion device. FIG. 7 is an enlarged horizontal sectional view of a main part of FIG. 5 for explaining the operation of the conventional bent-tube type pipe propulsion device at the time of direction correction, and FIG. 8 is a view at the time of the direction correction shown in FIG. FIG. 6 is an enlarged horizontal sectional view showing a state of a cutter head portion in the conventional bent-tube type pipe propulsion apparatus of FIG.
【０００５】図５乃至図８において、１はカッタヘッド
４が取り付けられた、先導体の前部をなす前胴、２はこ
の前胴１の後端部が連結され先導体の中間部をなす中
胴、３はこの中胴２の後端部が連結され先導体の後部を
なす後胴、４はローラビット５等のビットが取り付けら
れ地山を掘削するカッタヘッド、５は硬質地盤を掘削す
るためのローラビット、５ａはこのローラビット５をカ
ッタヘッド４に取り付けるための取付部材であるローラ
ビット取付ホルダー、６は前胴１を中胴２に対して連結
し傾動させる方向修正ジャッキである。図には明示され
ていないが、中胴２は、後胴３に対して自由に傾動でき
るように連結されている。また、後胴３の後端部にはヒ
ューム管等の埋設管が順次接続され、埋設管の最後部に
相当する位置には、管埋設の出発点となる発進立坑が構
築されており、発進立坑内には、先導体や埋設管を推進
するための元押しジャッキが設置されている。In FIG. 5 to FIG. 8, reference numeral 1 denotes a front body which is a front part of a front conductor to which a cutter head 4 is attached, and 2 denotes a middle part of the front conductor which is connected to a rear end of the front body 1. The middle body 3, the rear body of which the rear end of the middle body 2 is connected and forms the rear part of the leading conductor, 4 is a cutter head to which a bit such as a roller bit 5 is attached to dig the ground, and 5 is a hard ground. A roller bit 5a is a roller bit mounting holder which is a mounting member for mounting the roller bit 5 to the cutter head 4, and 6 is a direction correcting jack for connecting and tilting the front body 1 to the middle body 2. . Although not explicitly shown in the drawing, the middle trunk 2 is connected to the rear trunk 3 so as to be freely tiltable. A buried pipe such as a fume pipe is sequentially connected to the rear end of the rear body 3, and a starting shaft, which is a starting point for burying the pipe, is constructed at a position corresponding to the last part of the buried pipe. In the shaft, a main push jack for propelling the leading conductor and the buried pipe is installed.
【０００６】カッタヘッド４は、先行掘削手段が設けら
れる断面円錐形のヘッド部４ａと、このヘッド部４ａの
後方に連なりローラビット５が取り付けられるローラビ
ット取付部４ｂと、このローラビット取付部４ｂの後方
に連なり前胴１に取り付けられる外筒部４ｃとを備えて
いる。このカッタヘッド４は、先導体や埋設管よりも若
干大径の穴を掘削して先導体や埋設管と掘削穴との間に
環状通路９ａを形成し得るように、掘削外径が定められ
ている。ローラビット５は、切羽の外周側を掘削してカ
ッタヘッド４の掘削外径を定める外周掘削用のローラビ
ットと、外周掘削用のローラビットよりも切羽の内周側
を掘削する内周掘削用のローラビットとからなる。これ
ら外周掘削用のローラビットと内周掘削用のローラビッ
トとは、ローラビット取付ホルダー５ａを介して、ロー
ラビット取付部４ｂの周方向に所定の間隔を置いて交互
に取り付けられている。ローラビット５は、カッタヘッ
ド４の回転に伴って公転し、推力の付与により自転しな
がら地山を圧砕する働きをし、大礫層や玉石混じりの地
山等硬質の地山の掘削に適する。方向修正ジャッキ６
は、前胴１及び中胴２の周方向に所定間隔を置いて両者
を連結するように複数個設置され、これら複数個の方向
修正ジャッキ６のストローク差により前胴１を中胴２に
対して傾動させることができる。The cutter head 4 has a head portion 4a having a conical cross section provided with a preceding excavating means, a roller bit mounting portion 4b connected to the rear of the head portion 4a and having a roller bit 5 mounted thereon, and a roller bit mounting portion 4b. And an outer cylinder portion 4c connected to the front body 1 and connected to the rear of the vehicle. The cutter head 4 has an excavated outer diameter determined so that a hole having a diameter slightly larger than that of the leading conductor or the buried pipe can be drilled to form an annular passage 9a between the leading conductor or the buried pipe and the drilled hole. ing. The roller bit 5 is for excavating the outer peripheral side of the face to determine the outer diameter of the cutter head 4 for outer peripheral excavation, and for the inner peripheral excavating to excavate the inner peripheral side of the face more than the outer peripheral excavating roller bit. Roller bit. The roller bits for outer digging and the roller bits for inner digging are alternately mounted at predetermined intervals in the circumferential direction of the roller bit mounting portion 4b via the roller bit mounting holder 5a. The roller bit 5 revolves with the rotation of the cutter head 4 and acts to crush the ground while rotating by applying thrust, and is suitable for excavation of hard ground such as a large pebble layer and a ground mixed with cobblestones. . Direction correction jack 6
Are installed at predetermined intervals in the circumferential direction of the front body 1 and the middle body 2 so as to connect the front body 1 and the middle body 2. Can be tilted.
【０００７】７は掘削土砂をシリンダに取り込んでピス
トンで排土管に押し込むことにより圧送する土砂圧送装
置、８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としての添加材、
８ａは地上から送られる添加材を添加材注入口８ｂに供
給するための、添加材注入手段を構成する添加材供給通
路、８ｂは添加材を掘削土砂に放射状に注入するように
ヘッド部４ａに形成さた、添加材注入手段を構成する添
加材注入口、９は添加材注入孔８ｂから注入した添加材
８と掘削土砂とが撹拌混合されて生成された塑性流動性
のある泥土状の混合物、９ａは先導体の外周と掘削穴と
の間に形成され泥土状の混合物９が通過する環状通路で
ある。この環状通路９ａを通過する混合物９は、一部が
土砂圧送装置７に取り込まれて地上に圧送されるととも
に、残部が埋設管と掘削穴との間の環状通路を通過して
地上に排出される。[0007] Reference numeral 7 denotes a sediment pumping device which takes excavated earth and sand into a cylinder and presses it into a discharging pipe with a piston to feed the excavated earth and sand. Additive as liquid,
Reference numeral 8a denotes an additive supply passage which constitutes an additive injecting means for supplying an additive sent from the ground to the additive injecting port 8b, and 8b is provided on the head portion 4a so as to inject the additive radially into the excavated earth and sand. The additive material injection port 9 constituting the additive material injection means thus formed is a plastic-fluid mud-like mixture generated by stirring and mixing the additive material 8 injected from the additive material injection hole 8b and excavated earth and sand. , 9a are annular passages formed between the outer periphery of the leading conductor and the excavation hole and through which the mud-like mixture 9 passes. A part of the mixture 9 passing through the annular passage 9a is taken into the earth and sand pumping device 7 and sent to the ground, and the remainder is discharged to the ground through the annular passage between the buried pipe and the excavation hole. You.
【０００８】次に、この従来の中折れ式の管推進機の作
用について説明する。いま、図示されていない元押しジ
ャッキで埋設管を推進しつつカッタヘッド４を回転駆動
すると、カッタヘッド４は、断面円錐形のヘッド部４ａ
を切羽面に強制的に押し込みながらローラビット５で切
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、添加材８が添加材供給通路８ａを通
じてカッタヘッド４の添加材注入口８ｂに供給され、同
注入口８ｂ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、この添加材８と掘削土砂とが撹拌混合
されて塑性流動性のある泥土状の混合物９を生成し、こ
の混合物９は、環状通路９ａ内に圧入、充填されて、一
部が土砂圧送装置７に取り込まれて地上に圧送されると
ともに、残部が埋設管と掘削穴との間の環状通路を通過
する。その結果、先導体外周の環状通路９ａや埋設管外
周の環状通路を通過する混合物９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 conventional bent-tube type pipe propulsion device will be described. Now, when the cutter head 4 is rotationally driven while the buried pipe is being propelled by a main push jack (not shown), the cutter head 4 becomes a head portion 4a having a conical cross section.
Is forcibly pushed into the face, and the face is excavated with the roller bit 5 to excavate the excavation hole. In the process of digging the excavation hole, the additive 8 is supplied to the additive inlet 8b of the cutter head 4 through the additive supply passage 8a and injected into the excavated earth and sand from the inlet 8b in the radial direction. . Then, the additive material 8 and the excavated earth and sand are agitated and mixed to form a muddy mixture 9 having plastic fluidity. The mixture 9 is pressed into the annular passage 9a and filled therein, and a part of the mixture is pumped by earth and sand. While being taken into the apparatus 7 and pumped to the ground, the remainder passes through the annular passage between the buried pipe and the excavation hole. As a result, the penetration resistance of the mixture 9 passing through the annular passage 9a on the outer periphery of the leading conductor or the annular passage on the outer periphery of the buried pipe is reduced by the plastic fluidity thereof. It can be pushed in smoothly.
【０００９】また、こうして埋設管を埋設している過程
で曲線施工する場合には、方向修正ジャッキ５を伸縮し
て前胴１を中胴２に対して傾動させる。そうすると、前
胴１が中胴２に対して傾動しながら地山を掘進して曲進
し、次いで、中胴２が後胴３に対して傾動しながら方向
修正ジャッキ５の操作で前胴１の曲進経路をたどるよう
にして曲進し、さらに、後胴３も中胴２に追従するよう
に曲進する。そこで、この曲線施工時における管推進機
の状態を図７及び図８を用いて詳述する。図７におい
て、いま、右側のジャッキ６ａを伸ばすと、前胴１に左
側に傾動する力が付与されてカッタヘッド４に回転モー
メントＭを与えることができる。その結果、地山には，
前胴１やカッタヘッド４を通じて圧縮力が作用し，その
反力Ｆ1 がこれらに働く。この中折れ式の管推進機は、
カッタヘッド４にローラビット５が取り付けられてい
て、周辺地山が固く圧密された硬質地山で用いられる機
会が多い。そのため、こうした硬質地山で曲線施工を行
う場合、その反力Ｆ1 に打ち勝つだけのきわめて大きな
傾動力を前胴１に対して付与してやることが必要となっ
て、曲線施工が円滑に行えなくなる。また、その場合、
ローラビット取付ホルダー５ａやローラビット取付部４
ｂは、図８に示すように、外側が硬質地山に接触した状
態で公転することとなるため、摩耗することとなる。そ
して、特に、ローラビット取付ホルダー５ａの外側が摩
耗した場合、ローラビット回転部への土砂侵入防止用の
シール部材が破損してローラビット回転部へ土砂等が侵
入し、ローラビットが自転できなくなる。Further, when performing a curved construction in the process of burying the buried pipe, the front correcting body 5 is extended and contracted to tilt the front body 1 with respect to the middle body 2. Then, the front body 1 excavates the ground while making a tilt with respect to the middle body 2 and turns, and then the front body 1 is operated by operating the direction correcting jack 5 while the middle body 2 is tilting with respect to the rear body 3. , And the rear trunk 3 also moves so as to follow the middle trunk 2. The state of the pipe propulsion machine at the time of this curve construction will be described in detail with reference to FIGS. In FIG. 7, when the right jack 6 a is extended, a force for tilting the front body 1 to the left is applied, and a rotational moment M can be applied to the cutter head 4. As a result,
Front torso compressive force acts through one or cutter head 4, the reaction force F 1 acts on them. This mid-fold type pipe thruster
Since the roller bit 5 is attached to the cutter head 4, there are many occasions where the roller bit 5 is used in a hard ground where the surrounding ground is tightly compacted. Therefore, such a case of carrying out a hard place mountain curve construction, become necessary to'll grant a very large tilting force of only overcome the reaction force F 1 with respect to the front cylinder 1, curve construction is not smoothly performed. In that case,
Roller bit mounting holder 5a and roller bit mounting portion 4
As shown in FIG. 8, b revolves in a state in which the outside contacts the hard ground, so that b is worn. In particular, when the outside of the roller bit mounting holder 5a is worn, the seal member for preventing earth and sand from entering the roller bit rotating portion is damaged, and soil and the like enter the roller bit rotating portion, and the roller bit cannot rotate on its own. .
【００１０】こうした問題を防ぐため、出願人は、最
近、特開平７ー６２９８４号公報に示されているような
管推進機を開発した。この管推進機は、先導体や埋設管
の外周の環状通路に泥土状の混合物を圧入、充填するよ
うにした従来の管推進機と同様の中折れ式管推進機にお
いて、ローラビット取付ホルダーの外側に掘削刃を取り
付けてカッタヘッドの外周側の地山を掘削するように
し、これにより、ローラビット取付ホルダーが地山に接
触することなく公転するようにしたものである。In order to prevent such a problem, the applicant has recently developed a tube propulsion device as disclosed in Japanese Patent Application Laid-Open No. 7-62984. This pipe propulsion machine is similar to a conventional pipe propulsion machine that presses and fills a muddy mixture into an annular passage on the outer periphery of a leading conductor or a buried pipe. An excavation blade is attached to the outside to excavate the ground on the outer peripheral side of the cutter head, so that the roller bit mounting holder revolves without contacting the ground.
【００１１】[0011]
【発明が解決しようとする課題】ところで、添加材注入
口から掘削土砂に注入されて生成された泥土状の混合物
の多くは、隣接する外周掘削用のローラビットと内周掘
削用のローラビットとの間のローラビット間の隙間を経
由して、先導体外周の環状通路内に圧入、充填される。
そのため、こうしたローラビット間の隙間は、掘削物で
遮蔽されないようにして、混合物が後方の環状通路へ常
に円滑に送られるようにすることが必要である。しかる
に、前記特開平７ー６２９８４号公報に記載のような中
折れ式の管推進機を用いて、実際に硬質の地山の施工を
試みたところ、礫や玉石等の掘削物の大塊がローラビッ
ト間の隙間に挟まるという問題が生じた。By the way, most of the muddy mixture generated by injecting the excavated earth and sand from the additive injection port is formed by the adjacent outer peripheral excavation roller bit and inner peripheral excavation roller bit. And press-fit into the annular passage around the outer periphery of the leading conductor through the gap between the roller bits.
Therefore, it is necessary that the gap between the roller bits is not shielded by the excavated material so that the mixture is always smoothly fed to the rear annular passage. However, when an attempt was made to actually construct a hard ground using a bent-tube type pipe propulsion device as described in the above-mentioned Japanese Patent Application Laid-Open No. 7-62984, a large lump of excavated material such as gravels and cobblestones was found. There was a problem of being caught in the gap between the roller bits.
【００１２】本発明は、こうした従来の中折れ式の管推
進機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、硬質の地山でも曲線施工が円滑に行
え、ローラビット取付ホルダーの摩耗を防止できるだけ
でなく、隣接するローラビット間に礫等の掘削物の大塊
が挟まれるのも同時に防止できる中折れ式の管推進機を
提供することにある。SUMMARY OF THE INVENTION The present invention is intended to solve the problems encountered with such conventional bent-tube type pipe propulsion machines.
The technical problem is that it can smoothly perform curved construction even on hard ground and can not only prevent wear of the roller bit mounting holder, but also prevent large lumps of excavated matter such as gravel from being caught between adjacent roller bits. It is an object of the present invention to provide a bendable tube propulsion device.
【００１３】[0013]
【課題を解決するための手段】本発明のこうした技術課
題は、複数のローラビットがローラビット取付ホルダー
を介して周方向に取り付けられたカッタヘッドと、この
カッタヘッドが取り付けられ方向修正ジャッキの操作に
より傾動させることのできる前部と、埋設管を接続する
ことのできる後部と、掘削土砂に添加材を注入するため
の添加材注入手段とを有する先導体を備え、埋設管を推
進しながらカッタヘッドで地山を掘削して埋設管を地中
に埋設するとともに、その過程で、添加材を掘削土砂に
注入して塑性流動性のある混合物を生成し、その混合物
を先導体や埋設管と掘削穴との間の間隙に充填する中折
れ式の管推進機において、「ビット取付部材をカッタヘ
ッドに取り付けて、周方向に隣接するローラビット間に
前後方向に突出するように配置し、カッタヘッドで掘削
した掘削穴の穴壁を切削して整形できる穴壁切削用ビッ
トをカッタヘッドの径方向に突出するようにビット取付
部材に取り付けるようにした」ことにより達成される。SUMMARY OF THE INVENTION An object of the present invention is to provide a cutter head in which a plurality of roller bits are circumferentially mounted via a roller bit mounting holder and an operation of a direction correcting jack to which the cutter head is mounted. A tip conductor having a front part which can be tilted by the above, a rear part which can connect the buried pipe, and an additive material injection means for injecting the additive material into the excavated earth and sand. The ground is excavated with the head and the buried pipe is buried in the ground, and in the process, the additive is injected into the excavated earth and sand to generate a plastic-fluid mixture, and the mixture is mixed with the leading conductor and the buried pipe. In the middle-fold type pipe propulsion machine that fills the gap between the excavation hole and the pipe, a `` bit attachment member is attached to the cutter head, and between the roller bits adjacent in the circumferential direction.
It is arranged to protrude in the front-rear direction, and a hole wall cutting bit that can be shaped by cutting the hole wall of a drilled hole excavated with a cutter head is attached to the bit mounting member so as to protrude in the radial direction of the cutter head . Is achieved.
【００１４】本発明の中折れ式の管推進機は、こうした
技術手段を採用したため、管推進機の直線施工時には、
埋設管を推進しつつローラビットで切羽面を掘削すると
ともに、その掘削後の掘削穴の内周壁面に凹凸があれ
ば、ビット取付部材に取り付けた穴壁切削用ビットで削
り落して均す。その結果、ローラビット取付けホルダー
は、穴壁切削用ビットで壁面が整形された掘削穴の中を
地山と接触することなく空転することとなり、ローラビ
ット取付けホルダーの外側が摩耗することはない。こう
して掘削穴を掘削して埋設管を地中に埋設する過程で、
掘削土砂への添加材の注入により生成された塑性流動性
のある混合物は、周方向に隣接するローラビット間の隙
間を経由して、先導体外周の環状通路内に送られるが、
その場合、その生成された混合物は、ローラビット間の
隙間を丁度通過しようとするとき、ローラビット間に前
後方向に突出するように配置されたビット取付部材やカ
ッタヘッドの径方向に突出するようにビット取付部材に
取り付けられた穴壁切削用ビットによりタイミングよく
撹拌混合され、混合物の撹拌混合作用が一層促進され
る。本発明の中折れ式の管推進機では、特に、ビット取
付部材を周方向に隣接するローラビット間に前後方向に
突出するように配置し、このビット取付部材に穴壁切削
用ビットを取り付けるようにしているため、礫や玉石等
の掘削物の大塊がローラビット間の隙間に侵入しようと
しても、前後方向に突出するビット取付部材や穴壁切削
用ビットで侵入を阻止され又は跳ね飛ばされて、掘削物
の大塊がローラビット間の隙間に挟まるのを防止でき
る。[0014] Since the above-mentioned technical means is adopted in the center-fold type pipe propulsion device of the present invention, when the pipe propulsion device is constructed in a straight line,
The face of the cutting face is excavated with a roller bit while the buried pipe is being propelled. If the inner peripheral wall surface of the excavated hole after the excavation has irregularities, it is cut down and leveled by a hole wall cutting bit attached to the bit attaching member. As a result, the roller bit mounting holder idles without contacting the ground in the drilled hole whose wall surface is shaped by the hole wall cutting bit, and the outside of the roller bit mounting holder is not worn. In the process of digging the excavation hole and burying the buried pipe in the ground,
The mixture with plastic fluidity generated by the injection of the additive into the excavated earth and sand is sent into the annular passage around the leading conductor through the gap between the roller bits adjacent in the circumferential direction,
In that case, the resulting mixture is just prior to passing through the gap between the roller bits,
Bit mounting members or caps arranged to protrude rearward
The hole wall cutting bit attached to the bit attaching member so as to protrude in the radial direction of the cutter head stirs and mixes with good timing, thereby further promoting the stirring and mixing action of the mixture. In the bent-tube type pipe propulsion device of the present invention, in particular, the bit mounting member is disposed so as to protrude in the front-rear direction between the circumferentially adjacent roller bits. Because the bits are mounted, even if a large lump of excavated material such as gravel or cobblestones tries to enter the gap between the roller bits , the bit mounting member or hole wall that projects in the front-rear direction
It is possible to prevent a large lump of excavated material from being caught in the gap between the roller bits by being prevented from entering or being bounced off by the use bit.
【００１５】管推進機の曲線施工時には、切羽面をロー
ラビットで掘削することに加え、前胴やカッタヘッドが
傾動する側の地山を、ビット取付部材に取り付けた穴壁
切削用ビットで掘削して余掘する。そのため、硬質地山
で曲線施工する場合でも、前胴に大きい傾動力を付与す
ることなく管推進機の方向修正を行うことができて、ロ
ーラビット取付けホルダーが地山の反力を受けて動きが
とれなくなるようなことはなくなり、曲線施工が円滑に
行える。At the time of curve construction of a pipe propulsion machine, in addition to excavating the face with a roller bit, the ground on the side where the front body and the cutter head are tilted is excavated with a hole wall cutting bit attached to a bit attaching member. And excavate. Therefore, even when making a curved road with hard ground, it is possible to correct the direction of the pipe propulsion machine without applying large tilting power to the front body, and the roller bit mounting holder moves due to the reaction force of the ground. It is no longer impossible to remove the curve, and the curve construction can be performed smoothly.
【００１６】[0016]
【発明の実施の形態】以下、本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及び図２に基づ
いて説明することにより、本発明の実施の形態を明らか
にする。図１は、本発明の具体化例の中折れ式の管推進
機の要部を示す正面図、図２は、本発明の具体化例の中
折れ式の管推進機の要部を示す水平断面図、図３は、本
発明の具体化例の中折れ式の管推進機の効果を説明する
ためのカッタヘッド部の正面部分図、図４は、図３と同
様のカッタヘッド部の水平断面図である。図１乃至図４
において、図５乃至図８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、説明の重複を避ける
ため詳述しない。本発明の具体化例の中折れ式の管推進
機は、複数のローラビット５がローラビット取付ホルダ
ー５ａを介して周方向に取り付けられたカッタヘッド４
と、このカッタヘッド４が取り付けられ方向修正ジャッ
キ６の操作により傾動させることのでる、先導体の前部
をなす前胴１と、この前胴１の後端部が連結され先導体
の中間部をなす中胴２と、埋設管を接続することのでき
る先導体の後部をなす後胴３と、掘削土砂に添加材を注
入するための添加材注入手段をなす添加材供給通路８ａ
及び添加材注入口８ｂとを有する先導体を備え、埋設管
を推進しながらカッタヘッド４で地山を掘削して埋設管
を地中に埋設するとともに、その過程で、添加材８を掘
削土砂に注入して塑性流動性のある混合物９を生成し、
この混合物９を先導体や埋設管と掘削穴との間の環状間
隙に充填するようにしている点において、図５乃至図８
に示す従来の中折れ式の管推進機と変わらない。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described with reference to FIGS. 1 and 2 showing practical examples of how the present invention is actually embodied. I do. FIG. 1 is a front view showing a main part of a bent-tube type pipe propulsion device according to an embodiment of the present invention. FIG. 2 is a horizontal view showing a main portion of the bent-tube type pipe propulsion device according to the embodiment of the present invention. FIG. 3 is a front sectional view of a cutter head unit for explaining the effect of the bent-tube type pipe propulsion device according to an embodiment of the present invention. FIG. 4 is a horizontal view of the cutter head unit similar to FIG. It is sectional drawing. 1 to 4
In FIG. 5, the parts denoted by the same reference numerals as those in FIGS. 5 to 8 represent the same parts as those in FIGS. According to the embodiment of the present invention, a cutter head 4 in which a plurality of roller bits 5 are circumferentially mounted via roller bit mounting holders 5a is provided.
A front body 1 serving as a front part of the front conductor, to which the cutter head 4 is attached and which can be tilted by operating a direction correcting jack 6, and a rear end part of the front body 1 being connected to an intermediate part of the front conductor. , A rear body 3 forming a rear part of a leading conductor to which a buried pipe can be connected, and an additive supply passage 8a forming an additive injection means for injecting an additive into excavated earth and sand.
And a tip conductor having an additive injection port 8b, excavating the ground with the cutter head 4 and burying the buried pipe in the ground while propelling the buried pipe, and excavating the additive 8 in the process. To produce a mixture 9 with plastic flow,
5 to 8 in that the mixture 9 is filled in the annular gap between the leading conductor or the buried pipe and the borehole.
This is the same as the conventional bent-tube type pipe propulsion device shown in Figure 1.
【００１７】そこで、図１乃至図４に基づいて本発明の
具体化例の中折れ式の管推進機の特徴的な技術内容につ
いて説明する。これらの図において、１０はカッタヘッ
ドで掘削した掘削穴の穴壁を切削できる穴壁切削用ビッ
ト、１１は穴壁切削用ビット１０をカッタヘッド４のロ
ーラビット取付部４ｂに取り付けるためのビット取付部
材である。穴壁切削用ビット１０は、カッタヘッド４の
径方向に突出するようにビット取付部材１１の外側すな
わち地山側に取り付けられ、その掘削外径がカッタヘッ
ド４の掘削外径すなわち外周掘削用のローラビット５の
掘削外径に合致するように配設されている。したがっ
て、ローラビット５で切羽を掘削して掘削穴を形成する
と、穴壁切削用ビット１０は、その掘削穴の穴壁を直ち
に切削して凹凸がなくなるように整形して、カッタヘッ
ド４の掘削外径に見合った径の掘削穴壁面を仕上げる。
こうした穴壁切削用ビット１０は、本具体化例では、ビ
ット取付部材１１の外側すなわち地山側に複数個取り付
けられているとともにローラビット取付部４ｂ及び外筒
部４ｃの外周部にも取り付けられている。ビット取付部
材１１は、本具体化例では、周方向に隣接する外周掘削
用のローラビットと内周掘削用のローラビットとの間の
６個所の間隙にそれぞれ配置されて、隣接するローラビ
ット４の間に前後方向に突出するように配置されてい
る。The characteristic technical contents of the embodiment of the present invention will now be described with reference to FIGS. In these figures, reference numeral 10 denotes a hole wall cutting bit capable of cutting a hole wall of a drilled hole excavated by a cutter head, and reference numeral 11 denotes a bit attachment for attaching the hole wall cutting bit 10 to the roller bit attachment portion 4b of the cutter head 4. It is a member. The hole wall cutting bit 10 is mounted on the outside of the bit mounting member 11, that is, on the ground side so as to protrude in the radial direction of the cutter head 4. It is arranged so as to match the outer diameter of the excavation of the bit 5. Therefore, when a face is excavated with the roller bit 5 to form an excavation hole, the hole wall cutting bit 10 immediately cuts the hole wall of the excavation hole so as to eliminate irregularities, and excavates the cutter head 4. Finish the wall of the excavation hole with the diameter corresponding to the outer diameter.
In this embodiment, a plurality of such hole wall cutting bits 10 are mounted on the outer side of the bit mounting member 11, that is, on the ground side, and also mounted on the outer peripheral portions of the roller bit mounting portion 4b and the outer cylindrical portion 4c. I have. In this embodiment, the bit mounting members 11 are disposed in six gaps between the outer peripheral excavation roller bit and the inner peripheral excavation roller bit adjacent in the circumferential direction, and the adjacent roller bits 4 are provided. Are arranged to protrude in the front-rear direction .
【００１８】こうしたビット取付部材１１に穴壁切削用
ビット１０を取り付ける場合、管推進機の曲線施工時に
おけるローラビット取付ホルダー５ａの摩耗や破損を確
実に防止するため、穴壁切削用ビット１０のうち少なく
とも一つは、最外周のローラビット取付ホルダー５ａに
おけるローラビット５の取付部（ローラビットを回転で
きるように取り付けるためのローラビット５の取付部）
の最前方地点Ｐ又はこの最前方地点Ｐよりも前方の地点
における掘削穴の穴壁を切削できるように取り付けるこ
とが望ましい。図２でいえば、下方に点線で示されてい
るローラビット取付ホルダー５ａが外周掘削用のローラ
ビットを取り付けるためのもであって、最外周のローラ
ビット取付ホルダー５ａに該当し、この最外周のローラ
ビット取付ホルダー５ａに外周掘削用のローラビットを
回転できるように取り付けているローラビット５の取付
部の最前方地点は、Ｐの地点であるが、本具体化例で
は、最前方の穴壁切削用ビット１０がこのＰの地点にお
ける掘削穴の穴壁を切削し得るようにビット取付部材１
１に取り付けられている。穴壁切削用ビット１０をビッ
ト取付部材１１に取り付ける場合、このように、本具体
化例では、最前方の穴壁切削用ビット１０によりＰの地
点における掘削穴の穴壁を切削し得るようにしている
が、最前方の穴壁切削用ビット１０によりＰの地点より
も前方の地点における掘削穴の穴壁を切削できるように
したり、さらには、それよりも後方の穴壁切削用ビット
１０によりＰの地点における掘削穴の穴壁を切削できる
ようにしたりしてもよく、要は、Ｐの地点又はこのＰの
地点よりも前方の地点における掘削穴の穴壁を切削でき
るように穴壁切削用ビット１０を取り付けていれば、本
発明を一層効果的に具体化できる。When the hole cutting bit 10 is mounted on the bit mounting member 11, the hole bit cutting bit 10 is used to reliably prevent the roller bit mounting holder 5 a from being worn or damaged during curve construction of the pipe propulsion machine. At least one of them is provided with a roller bit 5 mounting portion (by rotating the roller bit) in the outermost roller bit mounting holder 5a.
Mounting part of roller bit 5 for mounting
Foremost point P or a point ahead of this foremost point P
It is desirable to attach so that the hole wall of the excavation hole in can be cut . In FIG. 2, the roller bit mounting holder 5a indicated by a dotted line below is for mounting a roller bit for outer peripheral excavation, and corresponds to the outermost roller bit mounting holder 5a. Roller bit for outer digging on roller bit mounting holder 5a
Installation of roller bit 5 that is installed so that it can rotate
The forwardmost point of the section is a point P, in this embodiment example, the forwardmost hole wall cutting bit 10 of our in point of the P
Bit mounting member 1 so that the hole wall of the drilled hole can be cut
It is attached to 1. When the hole wall cutting bit 10 is mounted on the bit mounting member 11, in this embodiment, the hole wall of the excavation hole at the point P can be cut by the foremost hole wall cutting bit 10 as described above. However, from the point P by the foremost hole wall cutting bit 10
Can also cut the hole wall of the excavated hole at the point in front
Or even a bit behind the hole wall
10 can cut the hole wall of the excavation hole at point P
It may be or so, in short, of the point or the P of P
The hole wall of the excavation hole at a point ahead of the point can be cut.
If the hole wall cutting bit 10 is attached as described above, the present invention can be embodied more effectively.
【００１９】本発明の具体化例の中折れ式の管推進機
は、このような構造を備えているので、管推進機の直線
施工時には、埋設管を推進しつつローラビット５で切羽
面を掘削するとともに、その掘削後の掘削穴の内周壁面
に凹凸があれば、ビット取付部材１１に取り付けた穴壁
切削用ビット１０やローラビット取付部４ｂ及び外筒部
４ｃの外周部に取り付けた穴壁切削用ビット１０で順次
削り落して均す。その結果、ローラビット取付けホルダ
ー５ａの外側すなわち地山側は、その穴壁切削用ビット
１０で壁面が整形された掘削穴を地山と接触することな
く空転することとなり、前記特開平７ー６２９８４号公
報に記載の従来の中折れ式の管推進機と同様、ローラビ
ット取付けホルダー５ａが摩耗するようなことはない。
こうして掘削穴を掘削して埋設管を地中に埋設する過程
で、添加材注入口８ｂから掘削土砂に注入されて生成さ
れた泥土状の混合物９は、隣接する外周掘削用のローラ
ビットと内周掘削用のローラビットとの間のローラビッ
ト５間の隙間を経由して、先導体外周の環状通路９ａ内
に圧入、充填されるが、その場合、その生成された泥土
状の混合物９は、ローラビット５間の隙間を丁度通過し
ようとするとき、ローラビット５間に前後方向に突出す
るように配置されたビット取付部材１１やカッタヘッド
の径方向に突出するようにビット取付部材に取り付けら
れた穴壁切削用ビット１０によりタイミングよく撹拌混
合されるため、前記従来の管推進機に比べて混合物９の
撹拌混合作用が一層促進されて、先導体や埋設管の貫入
抵抗を軽減し、さらには、排土時に混合物９を土砂圧送
装置７で圧送する際の抵抗も軽減することができる。Since the center-bend type pipe propulsion apparatus according to the embodiment of the present invention has such a structure, the face of the cutting face is pushed by the roller bit 5 while the buried pipe is propelled during the straight construction of the pipe propulsion apparatus. When the excavation was performed, if the inner peripheral wall surface of the excavated hole after the excavation had irregularities, it was attached to the outer peripheral portion of the hole wall cutting bit 10 attached to the bit attaching member 11, the roller bit attaching portion 4b, and the outer cylindrical portion 4c. The holes are sequentially cut down and leveled with a hole wall cutting bit 10. As a result, the outer side of the roller bit mounting holder 5a, that is, the ground side, idles without contacting the ground with the excavated hole whose wall surface has been shaped by the hole wall cutting bit 10, as described in JP-A-7-62984. As with the conventional bent-type tube propulsion device described in the publication, the roller bit mounting holder 5a does not wear out.
In the process of excavating the excavation hole and burying the buried pipe in the ground, the mud-like mixture 9 generated by being injected into the excavated earth and sand from the additive injection port 8b and the adjacent outer peripheral excavation roller bit are used. Via a gap between the roller bits 5 between the peripheral drilling roller bit and the roller bit 5, the inside of the annular passage 9a around the leading conductor is pressed and filled, and in this case, the generated muddy mixture 9 is formed. When just about to pass through the gap between the roller bits 5, it protrudes forward and backward between the roller bits 5.
Bit mounting member 11 and the cutter head disposed so that
The stir-mixing is carried out with good timing by the hole wall cutting bit 10 attached to the bit attaching member so as to protrude in the radial direction, so that the stirring-mixing action of the mixture 9 is further promoted as compared with the conventional pipe thruster. In addition, the penetration resistance of the leading conductor and the buried pipe can be reduced, and further, the resistance when the mixture 9 is pumped by the earth and sand pumping device 7 at the time of earth removal can be reduced.
【００２０】また、このように、ビット取付部材１１
を、特に周方向に隣接するローラビット５間に前後方向
に突出するように配置し、このビット取付部材１１に穴
壁切削用ビット１０を取り付けるようにしているため、
礫や玉石等の掘削物の大塊がローラビット５間の隙間に
挟まれようとしても、前後方向に突出するビット取付部
材１１や穴壁切削用ビット１０で邪魔され又は跳ね飛ば
されて、掘削物の大塊がローラビット間の隙間に挟まる
という前記従来の管推進機にみられたような問題が発生
するのを防ぐことができる。その結果、泥土状の混合物
９の経路となるローラビット５間の間隙が掘削物の大塊
で塞がれることなく開放状態に保たれて、混合物９が後
方の環状通路９ａへ円滑に送られることとなる。さら
に、管推進機の施工時には、図３及び図４に示すよう
に、ローラビットでの切羽の掘削後、巨大な玉石や巨礫
がその後方に地山から侵入することもあるが、本具体化
例では、穴壁切削用ビット１０がビット取付部材１１だ
けでなく、その後方のローラビット取付部４ｂや外筒部
４ｃにも取り付けられているため、こうした玉石や巨礫
は、ローラビット取付部４ｂや外筒部４ｃに取り付けら
た穴壁切削用ビット１０で地山側に跳ねのけられて、混
合物９の通過する環状通路９ａが閉塞されるようなこと
はない。Also, as described above, the bit mounting member 11
, Especially in the front-rear direction between circumferentially adjacent roller bits 5
In order to mount the hole wall cutting bit 10 to this bit mounting member 11,
Even if a large lump of excavated material such as gravel or cobblestone is to be caught in the gap between the roller bits 5, the excavation is hindered or bounced off by the bit mounting member 11 or the hole wall cutting bit 10 projecting in the front-rear direction. It is possible to prevent a problem such as the above-described conventional pipe propulsion device from occurring that a large lump of material is caught in the gap between the roller bits. As a result, the gap between the roller bits 5 serving as a path for the mud-like mixture 9 is kept open without being blocked by a large lump of excavated material, and the mixture 9 is smoothly sent to the rear annular passage 9a. It will be. Furthermore, at the time of construction of the pipe propulsion machine, as shown in FIGS. 3 and 4, after excavating the face with a roller bit, a huge cobblestone or boulder may invade from the ground behind it. In the example, the hole wall cutting bit 10 is mounted not only on the bit mounting member 11 but also on the roller bit mounting portion 4b and the outer cylindrical portion 4c behind the bit mounting member 11. It is not splashed toward the ground side by the hole wall cutting bit 10 attached to the outer cylinder portion 4c, and the annular passage 9a through which the mixture 9 passes is not blocked.
【００２１】管推進機の曲線施工時には、切羽面をロー
ラビット５で掘削することに加え、前胴１やカッタヘッ
ド４が傾動する側の地山を穴壁切削用ビット１０により
掘削して余掘するため、固く圧密された硬質地山で曲線
施工する場合でも、前胴１に大きい傾動力を付与するこ
となく管推進機の方向修正を行うことができて、ローラ
ビット取付けホルダー５ａが地山の反力Ｆ1 を受けて動
きがとれなくなるようなことはなくなり、曲線施工が円
滑に行える。以上のように、本具体化例によれば、硬質
の地山でも曲線施工が円滑に行え、ローラビット取付ホ
ルダー５ａの摩耗を防止できるだけでなく、隣接するロ
ーラビット５間に礫等の掘削物の大塊が挟まれるのも同
時に防止できる中折れ式の管推進機が得られる。At the time of curve construction of the pipe propulsion machine, in addition to excavating the face face with the roller bit 5, the ground on the side where the front body 1 and the cutter head 4 are inclined is excavated with the hole wall cutting bit 10. For excavation, even in the case of performing a curved construction on a hard ground that is compacted firmly, the direction of the pipe propulsion machine can be corrected without imparting a large tilting power to the front body 1, and the roller bit mounting holder 5a can be grounded. in response to the reaction force F 1 of the mountain no longer things like bogged, curve construction can be performed smoothly. As described above, according to this embodiment, the curved construction can be smoothly performed even on a hard ground, and not only can the wear of the roller bit mounting holder 5a be prevented, but also excavated material such as gravel between the adjacent roller bits 5 can be prevented. A bent-tube type pipe propulsion device which can prevent the large lump from being pinched at the same time is obtained.
【００２２】ところで、前述したように、前記公報に記
載の従来の中折れ式の管推進機では、直線施工時にロー
ラビット取付けホルダー５ａの外側が摩耗するのを防ぐ
ことはできるが、曲線施工時に、こうしたローラビット
取付けホルダー５ａの摩耗を確実に防ぐことはできな
い。すなわち、前記公報に記載の従来の中折れ式の管推
進機では、穴壁切削用ビット１０に相当する部材である
掘削刃がローラビット取付けホルダーそのものに取り付
けられていて、ローラビット取付けホルダーの前端付近
にこれを埋め込んで取り付けることができないため、掘
削刃は、ローラビット５の取付部の最前方地点Ｐに相当
する地点よりもかなり後方にしか取り付けることができ
ず、一方、ローラビット取付けホルダー５ａは、曲線施
工時に前胴１を傾動させた際、ローラビット５の取付部
の最前方地点Ｐに相当する個所が地山に押し当てられる
ことから、ローラビット取付けホルダー５ａの前端部付
近が摩耗する恐れがある。そのため、この従来の管推進
機では、長距離や比較的曲率半径の小さい曲線施工時、
ローラビット回転部への土砂侵入防止用のシール部材が
破損してローラビット回転部へ土砂等が侵入し、ローラ
ビットが自転できなくなる危惧がある。これに対して、
本具体化例の中折れ式の管推進機では、最前方の穴壁切
削用ビット１０は、前述したように、最外周のローラビ
ット取付ホルダー５ａにおけるローラビット５の取付部
の最前方地点Ｐにおける掘削穴の穴壁を切削できるよう
に取り付けられていて、ローラビット取付けホルダー５
ａの前端部付近が地山に接触するのを確実に防いでいる
ため、その前端部付近は、曲線施工時でも摩耗する危惧
はない。その結果、ローラビット５の土砂侵入防止用の
シール部材が破損してローラビット回転部へ土砂等が侵
入することにより、ローラビット５が自転できなくなる
ようなことはない。By the way, as described above, with the conventional bent-tube type pipe propulsion device described in the above-mentioned publication, it is possible to prevent the outside of the roller bit mounting holder 5a from being worn out during the straight-line work, but to prevent the outside from being worn during the curved work. However, such wear of the roller bit mounting holder 5a cannot be reliably prevented. That is, in the conventional bent-tube type pipe propulsion device described in the above publication, the excavation blade, which is a member corresponding to the hole wall cutting bit 10, is mounted on the roller bit mounting holder itself, and the front end of the roller bit mounting holder is Since it cannot be embedded and mounted in the vicinity, the excavating blade can be mounted only considerably behind the point corresponding to the foremost point P of the mounting portion of the roller bit 5, while the roller bit mounting holder 5a When the front body 1 is tilted at the time of curve construction, a position corresponding to the foremost point P of the mounting portion of the roller bit 5 is pressed against the ground, so that the front end of the roller bit mounting holder 5a is pressed. There is a risk of wear near the part. Therefore, with this conventional pipe propulsion machine, when constructing a curve with a long distance or a relatively small radius of curvature,
There is a concern that the seal member for preventing earth and sand from entering the roller bit rotating section may be damaged and earth and sand may enter the roller bit rotating section, making the roller bit unable to rotate. On the contrary,
In this embodiment, the foremost hole wall cutting bit 10 is, as described above , the mounting portion of the roller bit 5 in the outermost roller bit mounting holder 5a.
To cut the hole wall of the excavated hole at the forefront point P
And the roller bit mounting holder 5
Since the vicinity of the front end of “a” is reliably prevented from contacting the ground, there is no fear that the vicinity of the front end may be worn even during curve construction. As a result, there is no possibility that the seal member of the roller bit 5 for preventing earth and sand from being damaged and the earth and sand or the like intruding into the roller bit rotating portion does not prevent the roller bit 5 from rotating.
【００２３】[0023]
【発明の効果】以上の説明から明らかなように、本発明
によれば、複数のローラビットがローラビット取付ホル
ダーを介して周方向に取り付けられたカッタヘッドと、
このカッタヘッドが取り付けられ方向修正ジャッキの操
作により傾動させることのできる前部と、埋設管を接続
することのできる後部と、掘削土砂に添加材を注入する
ための添加材注入手段とを有する先導体を備え、埋設管
を推進しながらカッタヘッドで地山を掘削して埋設管を
地中に埋設するとともに、その過程で、添加材を掘削土
砂に注入して塑性流動性のある混合物を生成し、その混
合物を先導体や埋設管と掘削穴との間の間隙に充填する
中折れ式の管推進機において、特に、「ビット取付部材
をカッタヘッドに取り付けて、周方向に隣接するローラ
ビット間に前後方向に突出するように配置し、カッタヘ
ッドで掘削した掘削穴の穴壁を切削して整形できる穴壁
切削用ビットをカッタヘッドの径方向に突出するように
ビット取付部材に取り付けるようにした」ことにより、
硬質の地山でも曲線施工が円滑に行え、ローラビット取
付ホルダーの摩耗を防止できるだけでなく、隣接するロ
ーラビット間に礫等の掘削物の大塊が挟まれるのも同時
に防止できる中折れ式の管推進機が得られる。また、掘
削土砂への添加材の注入により生成された塑性流動性の
ある混合物は、隣接するローラビット間の隙間を経由し
て先導体外周の環状通路内に送られる際、ローラビット
間に前後方向に突出するように配置されたビット取付部
材やカッタヘッドの径方向に突出するようにビット取付
部材に取り付けられた穴壁掘削用ビットによりタイミン
グよく撹拌混合されて、混合物の撹拌混合作用が一層促
進され、先導体や埋設管の貫入抵抗や混合物の排土時の
圧送抵抗が軽減できる。本発明を具体化する場合、特に
特許請求の範囲の請求項２に記載の技術手段を採用すれ
ば、こうした効果を奏することに加え、最外周のローラ
ビット取付ホルダーにおけるローラビットの取付部の最
前方個所が曲線施工時でも地山に接触せず、摩耗する危
惧はない。その結果、ローラビット回転部への土砂侵入
防止用のシール部材が破損してローラビット回転部へ土
砂等が侵入することにより、ローラビットが自転できな
くなるようなことはない。本発明を具体化する場合、特
に特許請求の範囲の請求項３に記載の技術手段を採用す
れば、この請求項が従属する請求項に関する発明の効果
を奏することに加え、ローラビットでの切羽の掘削後、
巨大な玉石や巨礫がその後方に地山から侵入しても、玉
石や巨礫は、ビット取付部材よりも後方の位置に取り付
けられた穴壁掘削用ビットで地山側に跳ねのけられて、
混合物の通過する環状通路が閉塞されるようなことはな
い。As is apparent from the above description, according to the present invention, a cutter head in which a plurality of roller bits are circumferentially mounted via a roller bit mounting holder,
A leading portion having a front portion to which the cutter head is attached and which can be tilted by operation of a direction correcting jack, a rear portion to which a buried pipe can be connected, and additive material injection means for injecting additive material into excavated earth and sand. The body is buried in the ground by excavating the ground with a cutter head while propelling the buried pipe, and in the process, the additive is injected into the excavated earth and sand to produce a plastic fluid mixture In the case of a bendable pipe propulsion machine in which the mixture is filled in the gap between the leading conductor or the buried pipe and the excavation hole, particularly, `` the bit mounting member is attached to the cutter head, and the roller bit adjacent in the circumferential direction is attached. It arranged so as to project in the longitudinal direction between, <br/> bit mounted so as to project the hole walls cutting bits that can be cut to shape the hole wall of the wellbore that is drilled in the cutter head in the radial direction of the cutter head Department By the "possible to attach to,
The middle folding type can smoothly perform curve construction even on hard ground and can not only prevent wear of the roller bit mounting holder, but also prevent large blocks of excavated matter such as gravel from being caught between adjacent roller bits. A pipe thruster is obtained. Further, when the mixture having plastic fluidity generated by injecting the additive material into the excavated earth and sand is sent into the annular passage around the outer periphery of the leading conductor through the gap between the adjacent roller bits, the mixture flows between the roller bits. bit mounted so as to protrude in the radial direction of the arranged bit mounting member or cutter head so as to project in a direction
Stir-mixing is carried out with good timing by the drill bit for drilling the hole wall attached to the member, and the stirring-mixing action of the mixture is further promoted, and the penetration resistance of the leading conductor and the buried pipe and the resistance of the mixture during pumping during earth removal can be reduced. When embodying the present invention, particularly if adopted technical means according to claim 2 of the appended claims, in addition to achieve such effects, the uppermost of the mounting portion of the roller bit in outermost roller bits mounted holder The front part does not touch the ground even when constructing a curve, and there is no danger of abrasion. As a result, there is no possibility that the seal member for preventing earth and sand from entering the roller bit rotating section is broken and soil and the like enter the roller bit rotating section, so that the roller bit cannot rotate. When the present invention is embodied, in particular, if the technical means described in claim 3 is adopted, the effect of the invention related to the claim to which this claim is dependent can be obtained, and the face of the roller bit can be used. After excavation
Even if a giant boulder or boulder invades from behind the ground, the boulder or boulder is bounced toward the ground by a hole wall drilling bit attached at a position behind the bit mounting member,
The annular passage through which the mixture passes is not blocked.
【図１】本発明の具体化例の中折れ式の管推進機の要部
を示す正面図である。FIG. 1 is a front view showing a main part of a center-fold type pipe propulsion device according to an embodiment of the present invention.
【図２】本発明の具体化例の中折れ式の管推進機の要部
を示す水平断面図である。FIG. 2 is a horizontal cross-sectional view showing a main part of a bent-tube type pipe propulsion device according to an embodiment of the present invention.
【図３】本発明の具体化例の中折れ式の管推進機の効果
を説明するためのカッタヘッド部の正面部分図である。FIG. 3 is a front partial view of a cutter head section for explaining the effect of the center-fold type tube propulsion device according to an embodiment of the present invention.
【図４】図３と同様のカッタヘッド部の水平断面図であ
る。FIG. 4 is a horizontal sectional view of a cutter head similar to FIG.
【図５】従来の中折れ式の管推進機における先導体の部
分の全体構造を概略的に示す水平断面図である。FIG. 5 is a horizontal cross-sectional view schematically showing an entire structure of a leading conductor portion in a conventional bent-type tube propulsion device.
【図６】従来の中折れ式の管推進機におけるカッタヘッ
ド部の正面図である。FIG. 6 is a front view of a cutter head in a conventional bent-type tube propulsion device.
【図７】従来の中折れ式の管推進機の方向修正時の作用
を説明するための図５の要部を拡大して示す水平断面図
である。FIG. 7 is an enlarged horizontal sectional view showing an essential part of FIG. 5 for explaining the operation of the conventional bent-type tube propulsion device at the time of correcting the direction.
【図８】図７に示す方向修正時の従来の中折れ式の管推
進機におけるカッタヘッド部の状態を拡大して示す水平
断面図である。8 is an enlarged horizontal sectional view showing a state of a cutter head portion in the conventional bent-type tube propulsion device at the time of correcting the direction shown in FIG. 7;
１ 前胴 ２ 中胴 ３ 後胴 ４ カッタヘッド ４ａ ヘッド部 ４ｂ ローラビット取付部 ４ｃ 外筒部 ５ ローラビット ５ａ ローラビット取付ホルダー ６ 方向修正ジャッキ ７ 土砂圧送装置 ８ 添加物 ８ａ 添加材供給通路 ８ｂ 添加物注入口 ９ 混合物 ９ａ 環状通路 １０ 穴壁切削用ビット １１ ビット取付部材 DESCRIPTION OF SYMBOLS 1 Front trunk 2 Middle trunk 3 Rear trunk 4 Cutter head 4a Head part 4b Roller bit attachment part 4c Outer cylinder part 5 Roller bit 5a Roller bit attachment holder 6 Direction correction jack 7 Earth pressure feeder 8 Additive 8a Additive material supply passage 8b Additive Object inlet 9 Mixture 9a Annular passage 10 Bit for hole wall cutting 11 Bit mounting member
───────────────────────────────────────────────────── フロントページの続き (72)発明者 有馬 邦彦 茨城県土浦市神立町650番地 日立建機 株式会社 土浦工場内 (56)参考文献 特開 平７−62984（ＪＰ，Ａ) 特開 平８−28186（ＪＰ，Ａ) 特開 平８−53994（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) E21D 9/08 E21D 9/06 311 E21D 9/10 ────────────────────────────────────────────────── ─── Continued on the front page (72) Kunihiko Arima, Inventor 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Works (56) References JP-A-7-62984 (JP, A) JP-A-8 -28186 (JP, A) JP-A-8-53994 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) E21D 9/08 E21D 9/06 311 E21D 9/10
Claims (3)
ホルダーを介して周方向に取り付けられたカッタヘッド
と、このカッタヘッドが取り付けられ方向修正ジャッキ
の操作により傾動させることのできる前部と、埋設管を
接続することのできる後部と、掘削土砂に添加材を注入
するための添加材注入手段とを有する先導体を備え、埋
設管を推進しながらカッタヘッドで地山を掘削して埋設
管を地中に埋設するとともに、その過程で、添加材を掘
削土砂に注入して塑性流動性のある混合物を生成し、そ
の混合物を先導体や埋設管と掘削穴との間の間隙に充填
する中折れ式の管推進機において、ビット取付部材をカ
ッタヘッドに取り付けて、周方向に隣接するローラビッ
ト間に前後方向に突出するように配置し、カッタヘッド
で掘削した掘削穴の穴壁を切削して整形できる穴壁切削
用ビットをカッタヘッドの径方向に突出するようにビッ
ト取付部材に取り付けるようにしたことを特徴とする中
折れ式の管推進機。1. A cutter head in which a plurality of roller bits are circumferentially mounted via a roller bit mounting holder, a front part to which the cutter head is mounted and which can be tilted by operating a direction correcting jack, and a buried pipe. And a tip conductor having an additive injection means for injecting the additive into the excavated earth and sand, and excavating the ground with a cutter head while propelling the buried pipe to ground the buried pipe. During the process, the additive is injected into the excavated earth and sand to form a plastic-fluid mixture, and the mixture is filled into the gap between the conductor and the buried pipe and the excavation hole. In the pipe propulsion system of the type, the bit mounting member is mounted on the cutter head, arranged so as to protrude between the roller bits adjacent in the circumferential direction in the front-rear direction, and the drilling hole drilled by the cutter head is formed. A bent-tube type pipe propulsion machine, wherein a hole wall cutting bit that can be shaped by cutting a hole wall is attached to a bit attachment member so as to protrude in a radial direction of a cutter head .
向に突出するようにビット取付部材に取り付ける場合
に、ローラビットを回転できるように取り付けるための
最外周のローラビット取付ホルダーの取付部の最前方の
地点又はこの最前方の地点よりも前方の地点における掘
削穴の穴壁を切削できるように穴壁切削用ビットを取り
付けるようにしたことを特徴とする請求項１の中折れ式
の管推進機。2. A hole for cutting a hole wall is formed in a diameter of a cutter head.
For mounting the roller bit so that it can rotate when it is mounted on the bit mounting member so that it protrudes in the opposite direction.
The foremost part of the mounting part of the outermost roller bit mounting holder
At a point or at a point ahead of this foremost point
2. A bent-tube type pipe propulsion device according to claim 1, wherein a hole wall cutting bit is attached so that the hole wall of the hole can be cut.
向に突出するようにビット取付部材に取り付けるほか、
同様の穴壁切削用ビットをそのビット取付部材よりも後
方の位置にカッタヘッドの径方向に突出するように取り
付けるようにしたことを特徴とする請求項１又は請求項
２の中折れ式の管推進機。3. The cutting tool according to claim 1, wherein the hole wall cutting bit has a diameter equal to that of the cutter head.
In addition to attaching to the bit mounting member so that it protrudes in the direction
The same hole wall cutting bit is mounted at a position behind the bit mounting member so as to protrude in the radial direction of the cutter head . Bend type tube propulsion machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33215196A JP3253544B2 (en) | 1996-12-12 | 1996-12-12 | Bent tube propulsion machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33215196A JP3253544B2 (en) | 1996-12-12 | 1996-12-12 | Bent tube propulsion machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10169370A JPH10169370A (en) | 1998-06-23 |
| JP3253544B2 true JP3253544B2 (en) | 2002-02-04 |
Family
ID=18251726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33215196A Expired - Fee Related JP3253544B2 (en) | 1996-12-12 | 1996-12-12 | Bent tube propulsion machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3253544B2 (en) |
-
1996
- 1996-12-12 JP JP33215196A patent/JP3253544B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10169370A (en) | 1998-06-23 |
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| Publication | Publication Date | Title |
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