JPS6110189A - Underground buried duct repair device - Google Patents

Abstract

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

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は地中に埋設した管路を補修する装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for repairing a pipeline buried underground.

（従来の技術） 従来、損傷した地中埋設管路の補修にあたっては、第１
３図（ａ）に示すように道路を開削し、開削部の側壁を
鉄板１による土留めをし、既設管２の損傷部分を切り取
り、その切取部分に新管路６を側継手４を介して接続し
、その付近の周囲を同図（ｂ）に示すようにコンクリー
ト５で固定する方法がある。１だ第１４図（ａ）に示す
ように管路２内に油圧に、Ｌる拡径ジヤツキ６をワイヤ
７に接続してウィンチ８により挿入し、油圧ポンプ９に
よって、同図（ｂ）に示すように拡径ジヤツキ６を作動
せしめて管路２の修復を行なう方法もある。(Conventional technology) Conventionally, when repairing damaged underground pipelines, the first
As shown in Figure 3(a), the road is excavated, the side wall of the excavation is earth-retained with iron plates 1, the damaged part of the existing pipe 2 is cut out, and a new pipe line 6 is installed in the cut part through the side joint 4. There is a method in which the parts are connected together and the surrounding area is fixed with concrete 5 as shown in FIG. 5(b). 14 (a), connect the diameter expansion jack 6 to the wire 7 and insert it into the pipe line 2 using the winch 8, and then use the hydraulic pump 9 to insert it into the pipe line 2 (see Fig. 14(b)). As shown, there is also a method of operating the diameter expanding jack 6 to repair the conduit 2.

（発明が解決すべき問題点） 上記前者の方法は、道路の開削が困難な場所では補修が
できなく、また多条並び、多段積み管路の内側では不良
部分を切シ取って新しい管路を割シ入れることができな
い古いう問題点があった。(Problems to be solved by the invention) The former method cannot be repaired in places where it is difficult to excavate the road, and inside a multi-row or multi-layered pipe, the defective part is cut out and a new pipe is constructed. There was an old problem where it was not possible to assign

また後者の方法ではその適用は管種、損傷の種類が限定
され、第１５図（ａ）に示すような金属管路の折損や、
同図（ｂ）に示すような管路接続部の外れ等は補修でき
なく、また補修後の地盤変動等によって補修前の形状に
戻りやすい等の問題があった。In addition, the latter method is applicable only to limited types of pipes and types of damage, such as broken metal pipes as shown in Figure 15(a),
There were problems such as disconnection of the conduit connection as shown in FIG. 2(b) cannot be repaired, and it is easy to return to the shape before repair due to ground movement after repair.

本発明は上記のような問題点を解決するため、道路を開
削することなく、また損傷部分を切除して新らしい管路
を接合することなく、金属管を含めた地中埋設管路内へ
挿入して不良箇所を補修することができるようにした補
修装置を提供するものである。In order to solve the above-mentioned problems, the present invention enables underground pipes, including metal pipes, to be inserted into underground pipes without excavating roads, cutting out damaged parts, and connecting new pipes. The present invention provides a repair device that can be inserted to repair defective locations.

（問題点を解決するための手段） 本発明装置は、円筒状の本体外函１１の長手方向の中間
部に核外函１１の円周方向に同間隔で設けた数個の穴を
通る矯正刃１２を設け、これら矯正刃１２はその内周端
面を外函１１の内部に設けられた油圧シリンダ２１のピ
ストンロッド２５の先端に形成した円錐状僕２６と摺接
させ、該ピストンロッドの進行移動により矯正刃１２は
穴縁に案内されて外函１１外へ放射方向に広がるように
突出するようにし、本体外函１１の両端近くにおいて外
函１１の円周方向に一列に設けた複数個の穴を通る複数
“に分割の閉塞板１６を設け、この閉塞板はその内周端
面を油圧シリンダ２４のピストンロッド２５の先端に形
成した円錐状喫２６に接し、ピストンロッド２５が進行
移動することによりこの閉塞板１６の通る穴の穴縁に案
内されて外函１１外へ放射方向に突出して広がるように
し、矯正刃１２と一方の閉塞板１６との間において外函
１１の円周方向に分散して設けられ、外函１１内部でグ
ラウト送給ホース１９．２０に接続された数個のグラウ
ト注入孔１４を設け、また本体外函１１の一端側に結合
され該本体外函１１と同径の破砕部ケース１５にその円
周方向および軸方向に分散して設けた各穴をそれぞれ通
る各破砕刃６ａ。(Means for Solving the Problems) The device of the present invention provides correction through several holes provided at equal intervals in the circumferential direction of the nuclear outer box 11 in the longitudinally intermediate portion of the cylindrical main body outer box 11. Blades 12 are provided, and these straightening blades 12 have their inner circumferential end surfaces in sliding contact with a conical groove 26 formed at the tip of a piston rod 25 of a hydraulic cylinder 21 provided inside the outer case 11, thereby preventing the movement of the piston rod. By moving, the straightening blades 12 are guided by the edge of the hole and protrude outward from the outer case 11 in a radial direction. A plurality of divided blocking plates 16 are provided that pass through the holes, and the inner circumferential end surface of the blocking plates contacts a conical cutout 26 formed at the tip of the piston rod 25 of the hydraulic cylinder 24, so that the piston rod 25 moves forward. As a result, the blockage plate 16 is guided by the hole edge of the hole through which it protrudes and spreads outside the outer case 11 in the radial direction, and between the straightening blade 12 and one of the blockage plates 16, Several grout injection holes 14 are provided in the outer case 11 and are connected to the grout supply hoses 19 and 20 inside the outer case 11. The crushing blades 6a pass through holes distributed in the crushing part case 15 having the same diameter in the circumferential direction and the axial direction.

６ｂ、６ｃを設け、これら破砕刃１６ａ　、　１６ｂ　
、　１６ｃの内周端面は油圧シリンダ２７のピストンロ
ッド２８の先端に形成した円錐状撲２９に接し、ピスト
ンロッド２８の進行移動によりケース１５外へ放射方向
へ突出して広がるようにしたものである。6b, 6c are provided, and these crushing blades 16a, 16b
, 16c is in contact with a conical groove 29 formed at the tip of the piston rod 28 of the hydraulic cylinder 27, and as the piston rod 28 advances, it protrudes and expands in the radial direction outside the case 15.

（作　用） 本発明装置を管路内に挿入し、その管路の損傷箇所に矯
正刃１２を位置させ、この矯正刃１２を油圧シリンダ２
１内に油圧をかけてピストンロッド２２の進行移動させ
ることにより円錐状楔２６で矯正刃１２を放射状に広け
ることにより管路の損傷部分を元の形状に戻すことがで
き、また閉塞板１６を広げた状態でグラウト注入孔１４
からグラウトを吐出させて管路の割裂部よシ管路外へ出
して損傷部分の外周を覆うようにすることで補強するよ
うに修復できる。管路内壁に付着して固凍りかけたグラ
ウトは破砕刃１６ａ　、　ｉ６ｂ　、　１６ｃを広げた
状態で装置全体を動かすことにより破砕除去する。(Function) The device of the present invention is inserted into the pipe, the straightening blade 12 is positioned at the damaged part of the pipe, and the straightening blade 12 is inserted into the hydraulic cylinder 2.
By applying hydraulic pressure inside the piston rod 1 and moving the piston rod 22 forward, the conical wedge 26 spreads the straightening blades 12 radially, thereby returning the damaged portion of the pipe to its original shape. Grout injection hole 14 with expanded state.
It can be repaired by discharging grout from the cracked part of the pipe to the outside of the pipe to cover the outer periphery of the damaged part. The grout that has adhered to the inner wall of the pipe and is about to freeze is crushed and removed by moving the entire device with the crushing blades 16a, i6b, 16c spread out.

（実施例） 第１図は本発明の実施例の全体斜視図を示し、１１け円
筒状の本体外函、１２は外函１１に円周方向に等間隔に
設けられ外函の軸方向に長い穴より該縁に導かれて放射
方向に出入できるようにした６個の矯正刃、１６は本体
外函１１の両端部近くにおいて外函の円周方向に一列に
設けた穴より該穴縁に案内されてそれぞれ放射方向に移
動し得る２個に分割された閉塞板である。１４は外函１
１の外周に開口したグラウト注入孔、１５は破砕部ケー
ス、１６ａ　、　１６ｂ　、　１６ｃは破砕部ケース１
５に設けた穴から穴縁に案内されて出入し得る８個の破
砕刃である。矯正刃１２は第２図および第６図に示すよ
うに内周端面は油圧ホース１７と接続されたシリンダ２
１のピストンロッド２２の先端に形成した円錐状楔２６
と接し、該喫２６の進行移動により第体図←）に示すよ
うに本体外函１１の穴縁に案内されて軸と直角方向に動
いて外函１１外へ突出するよう広がる。６個の矯正刃１
２は左右両側のばね（図示省略）により常に収縮するよ
う力を受けており最も収縮したときはその外周面は本体
外函１１の外周面と一致する。閉塞板１６は第４図およ
び第５図に示すように内周端面は矯正刃１２と同様に油
圧ホース１７に接続された７すンダ２４のピストンロッ
ド２５の先端に形成した円錐状喫２６と接し、その進行
移動により第４図（ｂ）に示すように外函１１外に放射
方向に動いて突出して広がる。寸だこの閉塞板１３０分
割片はばね（図示省略）により常に縮捷る方向に力を受
け、その外周は縮まったとき外函１１の外周面と同じに
なる。油圧ホース１８．１９およびグラウト送給ホース
１９．２０は閉塞板１６の各分割片の間を通る。第１図
における左側の閉塞板１３の作動用シリンダは第４図に
示したものと左右反対方向になる。破砕刃１６ａ　、　
１６ｂ　、　１６ｃは第６図および第７図に示すように
、矯正刃１２、閉塞板１６と同様に油圧ホース１８に接
続されたンリ／ダ２７のピストンロッド２８の先端に形
成した円錐状喫２９の進行移動によって第へ図（ｂ）に
示すように外周方向へ広がる。各グラウト注入孔１４の
直前には、第８図に示すようにグラウト主剤送給ホース
１９とグラウト硬化剤送給ホース２０から送給されるグ
ラウト主剤と硬化剤とを混合して注入孔１４へ送るよう
Ｙ字管が設けられている。(Embodiment) Fig. 1 shows an overall perspective view of an embodiment of the present invention, in which 11 cylindrical main body outer cases, 12 are provided on the outer case 11 at equal intervals in the circumferential direction, and 12 are provided in the outer case 11 at equal intervals in the circumferential direction. Six straightening blades 16 are guided to the edge of a long hole and can enter and exit in the radial direction, and 16 are guided to the edge of the hole from holes provided in a row in the circumferential direction of the outer case near both ends of the main outer case 11. The occlusion plate is divided into two parts, each of which can be moved in the radial direction while being guided by the occlusion plate. 14 is outer box 1
1, a grout injection hole opened on the outer periphery of 1; 15, a fracture case; 16a, 16b, and 16c, a fracture case 1;
There are eight crushing blades that can go in and out through the hole provided in the hole 5 by being guided by the hole edge. As shown in FIGS. 2 and 6, the straightening blade 12 has an inner peripheral end surface connected to a cylinder 2 connected to a hydraulic hose 17.
A conical wedge 26 formed at the tip of the piston rod 22 of 1
As the sleeve 26 moves forward, it is guided by the hole edge of the main body outer case 11, moves in a direction perpendicular to the axis, and expands to protrude outside the outer case 11, as shown in the body diagram ←). 6 straightening blades 1
2 is constantly compressed by springs (not shown) on both the left and right sides, and when fully contracted, its outer circumferential surface coincides with the outer circumferential surface of the main body outer box 11. As shown in FIGS. 4 and 5, the inner circumferential end surface of the closing plate 16 has a conical cutout 26 formed at the tip of the piston rod 25 of a seven-seater 24 connected to the hydraulic hose 17, similar to the straightening blade 12. As a result of the advancing movement, they move in the radial direction outside the outer case 11 and protrude and spread as shown in FIG. 4(b). The divided pieces of the blockage plate 130, which are almost the same size, are always subjected to a force in the direction of contraction by a spring (not shown), and the outer circumference thereof becomes the same as the outer circumference of the outer case 11 when it is contracted. A hydraulic hose 18.19 and a grouting hose 19.20 pass between each segment of the closure plate 16. The operating cylinder of the left-hand closing plate 13 in FIG. 1 is oriented in the opposite direction to that shown in FIG. 4. Crushing blade 16a,
As shown in FIGS. 6 and 7, 16b and 16c are conical pipes 29 formed at the tip of the piston rod 28 of the hydraulic hose 18, which is connected to the hydraulic hose 18 in the same way as the straightening blade 12 and the closing plate 16. As a result of the progressive movement of , it spreads toward the outer periphery as shown in Fig. 1(b). Immediately before each grout injection hole 14, as shown in FIG. A Y-tube is provided to send it.

第９図は本発明装置を管路内へ入れて使用するときの状
態を示す。テレビジョンカメラ３１の後部に本発明装置
Ａを接続し、管路６２内を引き通したワイヤロープ６６
にカメラ６１を接続し、ホース１８．１９を制御盤６４
を介して油圧ポンプ６５に接続し、址だグラウト主剤送
給ホース１９および硬化剤送給ホース２０をそれぞれポ
ンプ３６　、３７を介して主剤タンク６８、硬化剤タン
ク３９に接続してカメラ６１および本発明装置Ａを管路
３２内へ入れ、ウィンチ４０を操作してワイヤローブ６
６を牽引し、同時にカメラ用ケーブル４１をケーブルド
ラム４２に巻き取りながらカメラ６１および本発明装置
Ａを引込み、管路６２内の状態をカメラ６１で撮りなが
らテレビジョン４２に写し出してみる。カメラ６１によ
り第１０図（ａ）のように損傷個所を確認したならば、
第１′０図（ｂ）に示すように矯正刃１２が損傷個所に
来るようにし、油圧ボンプロ５、制御盤６４を操作して
ピストンロッド２２およびピストンロッド２５を押し進
め、矯正刃１２および閉塞板１６を広げる。それにより
管路３２は第１０図（ｅ）に示すように矯正される。FIG. 9 shows the state in which the device of the present invention is inserted into a conduit and used. The device A of the present invention is connected to the rear of the television camera 31, and a wire rope 66 is passed through the conduit 62.
Connect the camera 61 to the control panel 64 and connect the hoses 18 and 19 to the control panel 64.
The grout base agent supply hose 19 and hardener supply hose 20 are connected to the base agent tank 68 and hardener tank 39 through pumps 36 and 37, respectively, and are connected to the camera 61 and the hardener tank 39. Put the invention device A into the pipe 32 and operate the winch 40 to remove the wire lobe 6.
At the same time, while winding the camera cable 41 around the cable drum 42, the camera 61 and the apparatus A of the present invention are pulled in, and the state inside the conduit 62 is photographed by the camera 61 and displayed on the television 42. Once the damaged area is confirmed using the camera 61 as shown in Figure 10(a),
As shown in FIG. 1'0(b), the straightening blade 12 is brought to the damaged area, and the piston rod 22 and the piston rod 25 are pushed forward by operating the hydraulic bomb processor 5 and the control panel 64. Expand 16. Thereby, the conduit 32 is straightened as shown in FIG. 10(e).

つぎに制御盤３４を操作してピストンロッド２８を押し
進め、破砕刃１６ａ　、　１６ｂ　、　１６Ｃを広げて
おき、グラウトポンプ３６．３７を作動せしめてグラウ
ト主剤および硬化剤をホース１８とホース１９に分けて
圧送し、注入孔１４の直前でＹ字管により混合して注入
孔１４より吐出させる。注入孔１４より吐出されたグラ
ウトは第１０図（ｃ）に示すように管路６２の割裂部よ
り外部へ出てその付近の外周を覆う。そこで制御盤６４
を操作して矯正刃１２および閉塞板１３が収縮するよう
にする。その後ウィンチ４０により装置Ａを管路の前方
まで移動させて洩れ出たグラウトを破砕し、ついで他方
側のウィンチ４６を巻き戻すことにより第１０図（ａ）
Ｋ示すように全グラウトが後退する破砕刃１６ａ。Next, operate the control panel 34 to push the piston rod 28 forward, spread the crushing blades 16a, 16b, and 16C, and operate the grout pumps 36 and 37 to separate the grout base agent and hardening agent into the hoses 18 and 19. The mixture is fed under pressure, mixed by a Y-tube just before the injection hole 14, and discharged from the injection hole 14. As shown in FIG. 10(c), the grout discharged from the injection hole 14 comes out from the split portion of the pipe line 62 and covers the outer periphery of the split portion. Therefore, the control panel 64
is operated so that the straightening blade 12 and the closing plate 13 are contracted. Thereafter, the device A is moved to the front of the pipe by the winch 40 to crush the leaking grout, and then the winch 46 on the other side is rewound, as shown in FIG. 10(a).
The crushing blade 16a with which all the grout retreats as shown in K.

１６ｂ　、　１６ｃによシ破砕される。破砕された時点
で破砕刃を収縮させ、引続きウィンチ４６を巻き戻して
補修装置Ａを管路６２内から取り出し、補修装置Ａに付
着したグラウトを取り除く。この時、グラウトは完全に
硬化していないので取り除くことｄ、容易である。なお
グラウト注入孔１４その他に残留しているグラウトも溶
剤を用いて溶解して除去し、次の使用に備える。補修装
置Ａを管外へ取り出しだ後、管路３２内にウェス等を数
回引き通して管路６２内に残ったグラウトを完全に取除
く。管体外周を覆ったグラウトは完全に固結し、管路外
から矯正部を固定することにより補修箇所の信頼性を増
す。It is crushed by 16b and 16c. When the repair device A is crushed, the crushing blade is retracted, and the winch 46 is then retracted to take out the repair device A from the pipe 62, and the grout attached to the repair device A is removed. At this time, the grout is not completely hardened and can be easily removed. Incidentally, the grout remaining in the grout injection hole 14 and other areas is also dissolved and removed using a solvent to prepare for the next use. After the repair device A is taken out of the pipe, a cloth or the like is passed through the pipe 32 several times to completely remove the grout remaining in the pipe 62. The grout that covers the outer periphery of the pipe solidifies completely, increasing the reliability of the repaired area by fixing the repaired part from outside the pipe.

管路３２の破損が第１１図に示しだような場合、破損箇
所へ矯正刃１２が来るようにしてこの矯正刃１２を拡げ
ることにより第１２図に示すように両側の破損口を合わ
せるように矯正できる３、なおその後グラウト注入を行
なう。If the pipe line 32 is damaged as shown in FIG. 11, the straightening blade 12 should be brought to the damaged area and expanded to align the damaged openings on both sides as shown in FIG. 12. 3, which can be corrected, and then grouting is performed.

（発明の効果） 以上のように本発明装置によれば、道路を開削すること
なく、捷だ損傷部分を切除して新たな管路を接合するこ
となく、管路内へ挿入して損傷個所を矯正刃を広けるこ
とにより元の形状に戻すことができ、また閉塞板を広げ
た状態でグラウト注入孔からグラウトを吐出せしめて割
裂部から管路外へ出し、その外周部を覆って固定するの
で、補修した部分が再び破損する恐れが少なく、その際
管内で固結しかけたグラウトを破砕刃を広げることによ
って破砕除去することができる。また管路の損傷態様に
応じ上記のような管路矯正機能、グラウト充填機能、管
路内の固結突出物破砕機能をそれぞれ単独で果たさせる
ように用いて管路の補修を行なうこともできる。(Effects of the Invention) As described above, according to the device of the present invention, the damaged part can be removed by inserting the pipe into the pipe without excavating the road, cutting out the twisted damaged part, and joining a new pipe. can be returned to its original shape by widening the straightening blade, and when the closing plate is widened, grout is discharged from the grout injection hole and out of the pipe from the split part, and the outer circumference is covered and fixed. Therefore, there is little risk that the repaired part will be damaged again, and at that time, the grout that is about to solidify inside the pipe can be crushed and removed by widening the crushing blade. In addition, depending on the type of damage to the pipeline, the above-mentioned functions of straightening the pipeline, filling it with grout, and crushing solidified protrusions within the pipeline may be used individually to repair the pipeline. can.

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

第１図は本発明の実施例の斜視図、第２図は矯正刃部の
断面図、第３図（、）は第２図のＡ−Ａ断面図、同図（
ｂ）は矯正刃の拡大時の断面図、第４図は閉塞板部の断
面図、第５図（ａ）は第４図のＢ−Ｂ線断面図、同図（
ｂ）は閉塞刃の拡大時の断面図、第６図は破砕部の端面
図、第７図（ａ）は第６図Ｃ−Ｃ線断面図、同図（ｂ）
は破砕刃拡大時の断面図、第８図はグラウト注入孔部の
断面図、第９図は管路内挿入時の断面図、第１０図は使
用時の動作状態説明図、第１１図は管路損傷例の側面図
、第１２図は第１１図の管路損傷部分修復時の使用状態
説明図、第１′５図は従来の道路開削による管路修復状
態の説明図、第１４図は従来の油圧ジヤツキによる管路
修復の説明図、第１５図は管路の損傷例の説明図を示す
。 １１・・・本体外函、１２・・・矯正刃、１６・・・閉
塞板、１４・・グラウト注入孔、１５・・・破砕部ケー
ス、１６ａ　、　１６ｂ　、　１６ｃ　・−・破砕刃、
１７　、１８　・・・油圧ホース、１９．２０・・・グ
ラウト送給ホース、２１゜２４．２７・・・油圧シリン
ダ、２２，２５．２８・・・ピストンロッド、２３，２
６．２９・・・円錐状模半１０図 Ｃす （ｌン （ｄ） １１３図 り 半１４図 」 ：＃１５日 ニーニ＝３Ｌ二二Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a cross-sectional view of the straightening blade section, Fig. 3 (,) is a cross-sectional view taken along line A-A in Fig. 2, and Fig.
b) is a cross-sectional view of the correction blade when it is enlarged, FIG. 4 is a cross-sectional view of the closing plate part, FIG.
b) is a sectional view of the closing blade when it is enlarged, FIG. 6 is an end view of the crushing part, FIG. 7(a) is a sectional view taken along line C-C in FIG. 6, and FIG. 7(b)
is a sectional view when the crushing blade is enlarged, Fig. 8 is a sectional view of the grout injection hole, Fig. 9 is a sectional view when inserted into the pipe, Fig. 10 is an explanatory diagram of the operating state during use, and Fig. 11 is A side view of an example of a damaged pipe, Fig. 12 is an explanatory diagram of the state of use when repairing the damaged part of the pipe in Fig. 11, Fig. 1'5 is an explanatory diagram of the state of repair of the pipe by conventional road cutting, Fig. 14 15 is an explanatory diagram of repair of a pipeline using a conventional hydraulic jack, and FIG. 15 is an explanatory diagram of an example of damage to a pipeline. DESCRIPTION OF SYMBOLS 11... Main body outer box, 12... Straightening blade, 16... Closure plate, 14... Grout injection hole, 15... Crushing part case, 16a, 16b, 16c... Crushing blade,
17, 18... Hydraulic hose, 19.20... Grout feeding hose, 21°24.27... Hydraulic cylinder, 22,25.28... Piston rod, 23,2
6.29...conical model half 10 figures C (ln(d) 113 figures half 14 figures): #15 day nini=3L22

Claims (1)

【特許請求の範囲】[Claims] 円筒状の本体外函の中間部に該外函の円周方向に同間隔
に設けた数個の穴を通り該穴縁に案内されて放射方向に
動き得る矯正刃と、前記本体外函の両端近くで該外函の
円周方向に一列に設けた複数の穴を通り該穴縁に案内さ
れて放射方向に移動し得る複数個に分割の閉塞板と、前
記矯正刃と一方の閉塞板との間の前記本体外函の円周方
向に分散して設けられ該外函内でグラウト送給ホースに
接続された数個のグラウト注入孔を有し、前記本体外函
の一端側に結合された円筒状破砕部ケースに設けた穴を
通り該穴縁に案内されて放射方向に移動し得る破砕刃を
有し、前記矯正刃、閉塞板および破砕刃はその内周端面
がそれぞれ各油圧シリンダのピストンロッドの先端に形
成した円錐状楔と接し、該ピストンロッドの進行移動に
より放射方向へ広がるようになされていることを特徴と
する地中埋設管路補修装置。A straightening blade that passes through several holes provided at the same intervals in the circumferential direction of the outer case in the middle part of the cylindrical main body outer case and can move in the radial direction guided by the hole edges; A closing plate divided into a plurality of pieces that can be moved in a radial direction through a plurality of holes arranged in a row in the circumferential direction of the outer case near both ends and guided by the hole edges, the correction blade and one closing plate. The main body outer case has several grout injection holes distributed in the circumferential direction of the main body outer case and connected to a grout feeding hose within the outer case, and is connected to one end side of the main body outer case. It has a crushing blade that can move in the radial direction through a hole provided in the cylindrical crushing part case, guided by the edge of the hole, and the inner peripheral end surface of the straightening blade, the closing plate, and the crushing blade is An underground conduit repair device characterized by being in contact with a conical wedge formed at the tip of a piston rod of a cylinder, and expanding in a radial direction as the piston rod moves forward.