JPH0949586A - Reduction method for peripheral surface friction of underground pipe - Google Patents
Reduction method for peripheral surface friction of underground pipeInfo
- Publication number
- JPH0949586A JPH0949586A JP7222699A JP22269995A JPH0949586A JP H0949586 A JPH0949586 A JP H0949586A JP 7222699 A JP7222699 A JP 7222699A JP 22269995 A JP22269995 A JP 22269995A JP H0949586 A JPH0949586 A JP H0949586A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- excavation
- underground
- underground pipe
- jig
- 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.)
- Granted
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】 本発明はガス管、水道管、
石油管やケーブル保護管等の既設の地中管を引き抜き撤
去する場合や、新規に地中管を推進工法等で長距離埋設
する場合、これらの作業を容易にするため、地中管と地
盤との周面摩擦を低減する方法に関する。TECHNICAL FIELD The present invention relates to a gas pipe, a water pipe,
When removing existing underground pipes such as oil pipes and cable protection pipes, and when burying new underground pipes for a long distance by the propulsion method, etc., in order to facilitate these operations, the underground pipe and ground The present invention relates to a method of reducing circumferential friction with
【０００２】[0002]
【従来の技術】 近年、地中に埋設されているガス管、
水道管等の既設管を新管に敷設替えする工事が多くなっ
ており、各種の工法が提案されている。最も一般的な工
法は地上から開削して敷設替えするものであるが、交通
障害となるため、立坑を設けて非開削で敷設替えする工
法が注目されている。この非開削敷設替え工法には各種
のものが提案され、一部実用化されている。図６に例示
した工法は、既設管１ａより若干大きめの新管１を用
い、この新管１で既設管１ａを包囲して新管１の先端に
設けた掘削機２２により推進し、既設管１ａを引き抜き
撤去するものである。2. Description of the Related Art In recent years, gas pipes buried underground,
There is an increasing number of works to replace existing pipes such as water pipes with new pipes, and various construction methods have been proposed. The most common method is to open and cut from the ground and replace it. However, because it becomes a traffic obstacle, a method of installing and laying a vertical shaft, which does not open and cut, is receiving attention. Various non-excavation laying replacement construction methods have been proposed and partially put into practical use. The construction method illustrated in FIG. 6 uses a new pipe 1 that is slightly larger than the existing pipe 1a, and the new pipe 1 surrounds the existing pipe 1a and propels it with an excavator 22 provided at the tip of the new pipe 1 1a is pulled out and removed.
【０００３】また、新規に地中管を推進工法で埋設する
方法には各種のものがあるが、このうち数百メートルの
長距離推進工法には、特公昭６１−４０８４０号公報、
特公昭６２−２１９５５号公報、特公昭６０−５９３９
８号公報に記載されたものがある。この工法は図７に示
すように先端の指向性ドリル８にドリルパイプ１６を接
続延長しながら曲線状の計画軌道にパイロット孔を設け
た後、ドリルパイプ１６に拡径ビット９を有するケーシ
ングパイプ１を取り付けてパイロット孔を拡径し、地中
管を引き込むものであって、拡径工程は１回又は数回行
われ、またケーシング管が埋設管として用いられる場合
や、ケーシング管の中に地中管を引き込み２重管とされ
る場合がある。There are various methods for burying a new underground pipe by the propulsion method. Among them, the long-distance propulsion method of several hundred meters is disclosed in Japanese Examined Patent Publication No. Sho 61-40840.
Japanese Patent Publication No. 62-21955, Japanese Patent Publication No. 60-5939
There is one described in Japanese Patent No. As shown in FIG. 7, this method involves forming a pilot hole in a curved planned track while connecting and extending a drill pipe 16 to a directional drill 8 at the tip, and then forming a casing pipe 1 having a diameter expansion bit 9 in the drill pipe 16. Is installed to expand the pilot hole and draw in the underground pipe, and the expansion process is performed once or several times, and when the casing pipe is used as a buried pipe or in the casing pipe. The middle tube may be pulled in to be a double tube.
【０００４】[0004]
【発明が解決しようとする課題】 従来の非開削敷設替
え工法において既設管を壊しながら新管に置き換えるも
のは、既設管が鋼管の場合には強大な破壊力を要し能率
が悪く、また、既設管より若干大きめの新管で既設管を
包囲して推進し、既設管を引き抜き撤去する工法では、
新管が既設管より大径となり、その分外周地盤との周面
積が増加して周面摩擦力が大きくなるため、大きな推進
力を要し、長距離にわたって推進できない課題があっ
た。Problems to be Solved by the Invention In the conventional non-excavation laying replacement method, a method of replacing an existing pipe with a new pipe requires a large destructive force when the existing pipe is a steel pipe, and is inefficient. In the method of surrounding and promoting the existing pipe with a new pipe slightly larger than the existing pipe, and pulling out and removing the existing pipe,
Since the new pipe has a larger diameter than the existing pipe, the peripheral area with the outer ground increases and the frictional force on the peripheral surface increases accordingly, so a large propulsive force is required and there is a problem that it cannot be propelled over a long distance.
【０００５】また、新規に地中管を長距離推進する前記
従来工法でも、推進距離が長くなるに従ってドリルパイ
プやケーシング管又は新管の周面摩擦が増加して大きな
推進力を要するため、特に大径管において推進距離の長
距離化が困難となり、また推進設備の大型化を招いてい
た。さらに、前記非開削敷設替え工法および新設管の長
距離推進工法において施工距離が長くなった場合、周面
摩擦力の増加によりスタック（周面地盤の摩擦抵抗によ
る管体の拘束現象）が生じて、推進不能となるトラブル
が起きることがあった。Further, even in the above-mentioned conventional method of newly propelling the underground pipe over a long distance, the peripheral friction of the drill pipe, the casing pipe or the new pipe increases as the propulsion distance increases, and a large propulsive force is required. It was difficult to increase the propulsion distance for large-diameter pipes, and the size of propulsion equipment was increased. Furthermore, when the construction distance becomes long in the above-mentioned non-excavation laying replacement construction method and long-distance propulsion construction method for new pipes, stacks (constraint phenomenon of pipe body due to frictional resistance of peripheral ground) occur due to increase in peripheral frictional force. , Occasionally, a trouble that could not be promoted occurred.
【０００６】本発明は、このような従来技術の課題を解
消し、既設地中管を引き抜き撤去する場合又は新規に地
中管を埋設する際、地中管と地盤との周面摩擦を低減す
ることによって容易に地中管を引き抜き撤去又は推進可
能とし、施工距離の長距離化、推進設備の小型化を図
り、推進施工中のスタックトラブルを解消することを目
的とする。The present invention solves the above-mentioned problems of the prior art, and reduces the peripheral friction between the underground pipe and the ground when the existing underground pipe is pulled out and removed or when a new underground pipe is buried. By doing so, the underground pipe can be easily pulled out, removed or promoted, the construction distance is lengthened, the propulsion equipment is downsized, and the stack trouble during propulsion construction is eliminated.
【０００７】[0007]
【課題を解決するための手段】 本発明では、地中に埋
設されている既設管や推進施工中の掘削管（ドリルパイ
プ、ケーシング管又は新管）といった地中管を包囲し、
前後に複数のノズルを備え、当該地中管をガイドにして
長手方向に移動可能とした拡掘治具を用いる。地上から
前後ノズルに泥水等の加圧水を供給して、地中管の周囲
の土砂をリング状に排除しながら拡掘治具を地中管に沿
って移動させることにより地中管と外周地盤との間の隙
間を生じさせ、摩擦力を低減させて地中管の引き抜きや
推進を行なう。Means for Solving the Problems In the present invention, an underground pipe such as an existing pipe buried in the ground or an excavation pipe (drill pipe, casing pipe or new pipe) under propulsion construction is surrounded,
An excavating jig that has a plurality of nozzles in the front and rear and is movable in the longitudinal direction using the underground pipe as a guide is used. By supplying pressurized water such as muddy water from the ground to the front and rear nozzles and removing the earth and sand around the underground pipe in a ring shape, the excavation jig is moved along the underground pipe to form the underground pipe and the outer ground. A gap is created between them to reduce the frictional force and pull out or propel the underground pipe.
【０００８】[0008]
【発明の実施の形態】 図１の実施の形態は、非開削敷
設替え工法における既設管引き抜き撤去に本発明を適用
した例である。先ず、既設管１の途中に発進立坑６を設
け、既設管１を切断する。次に拡掘治具１０を既設管１
の管端に外挿し、ある程度押し込んだ後、図示省略の加
圧水ポンプを起動し、拡掘治具１０からベントナイト泥
水等の加圧水５を噴出させながら移動パイプ１６に推力
を加え、既設管１に沿って拡掘治具１０を前進させる。
拡掘治具１０の移動に伴い、既設管１の外周地盤２は前
部ノズル１１から噴出する加圧水にてリング状に拡掘さ
れ、掘削された土砂は後部ノズル１２により発進立坑側
に加圧水と混合されて戻される。掘削土砂と加圧水の混
合物４は発進立坑６に備えている容器１７に貯え、水中
ポンプ７で地上に送られて廃棄処分される。この際ベン
トナイト等の加圧水は処理されて再利用してもよい。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of FIG. 1 is an example in which the present invention is applied to pulling out and removing an existing pipe in a non-excavation laying replacement method. First, a starting shaft 6 is provided in the middle of the existing pipe 1, and the existing pipe 1 is cut. Next, the extension jig 10 is attached to the existing pipe 1.
After pushing it to the end of the pipe and pushing it to some extent, a pressurized water pump (not shown) is started, and thrust is applied to the moving pipe 16 while ejecting the pressurized water 5 such as bentonite muddy water from the digging jig 10 and along the existing pipe 1. And the excavation jig 10 is moved forward.
Along with the movement of the excavation jig 10, the outer peripheral ground 2 of the existing pipe 1 is excavated in a ring shape by the pressurized water jetted from the front nozzle 11, and the excavated earth and sand is pressurized by the rear nozzle 12 to the start vertical shaft side. It is mixed and returned. The mixture 4 of excavated soil and pressurized water is stored in the container 17 provided in the starting shaft 6, and is sent to the ground by the submersible pump 7 for disposal. At this time, the pressurized water such as bentonite may be treated and reused.
【０００９】なお、拡掘開始直後は拡掘治具１０の後部
ノズル１２から発進立坑２０に加圧水が直接噴射される
ため、加圧水の圧力を弱めたり遮蔽板を設ける等の対策
を講じる。移動パイプ１６の定尺分前進したら次の移動
パイプ１６をネジ接続により延長し、同様の作業を繰り
返して到達側立坑に至る。拡掘作業が終了したら拡掘治
具１０を到達立坑側で１本目の移動パイプ１６から外し
て回収し、他の移動パイプ１６を発進立坑側に引き戻し
ながら回収する。次に既設管１を発進立坑又は到達立坑
側に引き抜き、切断を行って撤去する。この引き抜き作
業においては、既設管１の外周面と地盤２との間に隙間
が生じているため、摩擦力が低減され容易に引き抜くこ
とができる。Immediately after the start of the excavation, pressurized water is directly jetted from the rear nozzle 12 of the excavation jig 10 to the starting shaft 20. Therefore, measures such as weakening the pressure of the pressurized water and providing a shielding plate are taken. When the moving pipe 16 has moved forward by a fixed length, the next moving pipe 16 is extended by screw connection, and the same work is repeated to reach the reaching shaft. When the excavation work is completed, the excavation jig 10 is removed from the first moving pipe 16 on the arrival shaft side and collected, and the other moving pipe 16 is collected while being pulled back to the starting shaft side. Next, the existing pipe 1 is pulled out to the side of the starting shaft or the reaching shaft, cut and removed. In this drawing operation, since a gap is created between the outer peripheral surface of the existing pipe 1 and the ground 2, the frictional force is reduced and the drawing can be easily carried out.
【００１０】図２の実施の形態は、非開削敷設替え工法
において既設管１ａの引き抜き後、既設管１ａより大径
のケーシング管（新管）１を埋設して、孔壁３を保護し
たり敷設替えする場合に本発明を適用した例である。こ
の場合は、既設管１ａの外周を包囲するケーシング管
（新管）１に拡掘治具１０を外挿し、ケーシング管（新
管）１の推進と同時に拡掘治具１０を加圧水を噴出させ
ながら前進させる。または、ケーシング管（新管）１の
推進距離が長くなり推進が不能になった場合のみ拡掘治
具１０を用いて周面摩擦を低減することとしてもよい。The embodiment shown in FIG. 2 protects the hole wall 3 by pulling out the existing pipe 1a and then burying a casing pipe (new pipe) 1 having a diameter larger than that of the existing pipe 1a in the non-open excavation replacement method. It is an example in which the present invention is applied to the case of re-laying. In this case, the excavating jig 10 is externally inserted into the casing pipe (new pipe) 1 that surrounds the outer circumference of the existing pipe 1a, and the casing pipe (new pipe) 1 is propelled and the excavating jig 10 is caused to eject pressurized water. While moving forward. Alternatively, the peripheral surface friction may be reduced by using the excavating jig 10 only when the propulsion distance of the casing pipe (new pipe) 1 becomes long and the propulsion becomes impossible.
【００１１】図３の実施の形態は、指向性ドリル８を用
いて曲線状にパイロット掘削を行い、このパイロット掘
削孔を順次拡径して新管を敷設する長距離推進工法に本
発明を適用した例である。先行掘進するパイロット孔の
後方から先端にリング状の拡径ビット９を備えた掘削管
１を回転させて拡径推進する際、掘削管１の掘進抵抗を
減少させるために、掘削管１に本発明の拡掘治具１０を
外挿して掘削管１の外周地盤２の摩擦力を低減させてい
る。拡掘治具１０による掘削管１の外周地盤２の拡掘手
順は前記図２の例と同様に行えばよい。拡掘治具１０を
外挿する地中管は図示のような掘削管１の他、パイロッ
ト管やケーシング管、新管いずれであってもよい。ま
た、本発明は推進途中においてこれらの地中管にスタッ
クが生じた際、これを解除するため用いてもよい。この
場合、地中管に外挿した拡掘治具１０をノズルから加圧
水を噴射しながら前後に移動させて、地中管外周地盤２
の摩擦を低減することにした方がよい。In the embodiment shown in FIG. 3, the present invention is applied to a long-distance propulsion method in which a directional drill 8 is used to perform pilot drilling in a curved shape, and the pilot drilling holes are successively expanded to lay a new pipe. It is an example. In order to reduce the excavation resistance of the excavation pipe 1 when rotating and excavating the excavation pipe 1 equipped with the ring-shaped expansion bit 9 at the tip from the rear of the pilot hole which is advanced in advance, The excavation jig 10 of the invention is externally inserted to reduce the frictional force of the outer ground 2 of the excavation pipe 1. The procedure for excavating the outer ground 2 of the excavation pipe 1 by the excavation jig 10 may be performed in the same manner as in the example of FIG. The underground pipe into which the excavating jig 10 is externally inserted may be any of the pilot pipe, the casing pipe, and the new pipe in addition to the drill pipe 1 shown in the drawing. In addition, the present invention may be used to cancel the stack when these underground pipes are stuck during propulsion. In this case, the excavating jig 10 extrapolated to the underground pipe is moved back and forth while injecting pressurized water from the nozzle, and the underground pipe outer peripheral ground 2
It is better to reduce the friction of.
【００１２】図４は本発明に用いる拡掘治具１０の構成
を示すものであり、地中管１より若干大きめの内周径と
した前部ノズル管１１と後部ノズル管１２を連通管１３
で接続し、外側を鋼板製の円筒カバー１４で覆ってい
る。なお、連通管を使用せず、前部ノズル管１１と後部
ノズル管１２に別々に加圧水を供給するようにしてもよ
い。前部ノズル管１１と後部ノズル管１２には、それぞ
れ外挿される地中管１の管軸方向に向けて泥水等の加圧
水５を噴射する複数（実施例では８個）のノズル１５が
設けられている。また、拡掘治具１０の後部ノズル管１
２側には、拡掘治具１０を地中管１に外挿し、これに沿
って前後に移動させるための移動パイプ１６の一端が固
定されている。この移動パイプ１６は加圧水５を送る機
能も兼ねており、ネジ継手で接続延長されるドリルパイ
プまたはこれと同等品が用いられる。移動パイプ１６は
１本でもよいが、バランスよく拡掘治具１０に力を加え
るには複数本にしても良い。なお、拡掘治具１０の前後
から加圧水５を噴出するようにしているのは、前方ノズ
ルから噴射する加圧水５で地中管外周の地盤をリング状
に掘削し、後方ノズルから噴射する加圧水５で掘削した
土砂と加圧水の混合液を立坑側に戻すため、及び拡掘治
具１０の前後両方向への移動を可能とするためである。FIG. 4 shows the construction of the excavating jig 10 used in the present invention, in which a front nozzle pipe 11 and a rear nozzle pipe 12 each having a slightly larger inner diameter than the underground pipe 1 are connected to each other by a communicating pipe 13.
, And the outside is covered with a cylindrical cover 14 made of steel plate. Note that the pressurized water may be separately supplied to the front nozzle pipe 11 and the rear nozzle pipe 12 without using the communication pipe. Each of the front nozzle pipe 11 and the rear nozzle pipe 12 is provided with a plurality of (eight in the embodiment) nozzles 15 for injecting pressurized water 5 such as muddy water toward the axial direction of the underground pipe 1 to be inserted. ing. Further, the rear nozzle tube 1 of the digging jig 10
On the second side, one end of a moving pipe 16 for fixing the excavation jig 10 to the outside of the underground pipe 1 and moving it back and forth along the underground pipe 1 is fixed. The moving pipe 16 also has a function of sending the pressurized water 5, and a drill pipe or an equivalent product which is connected and extended by a screw joint is used. The moving pipe 16 may be one, but a plurality of moving pipes 16 may be used to apply force to the excavating jig 10 in a well-balanced manner. The pressurized water 5 is jetted from the front and rear of the excavating jig 10 because the pressurized water 5 jetted from the front nozzle excavates the ground around the underground pipe in a ring shape, and the pressurized water 5 jetted from the rear nozzle. This is for returning the mixed liquid of the earth and sand and the pressurized water excavated in 1. to the vertical shaft side, and for enabling the excavating jig 10 to move in both the front and rear directions.
【００１３】[0013]
【発明の効果】 本発明によれば既設や新規に埋設する
地中管の外周を拡掘治具で包囲し、拡掘治具の前後の複
数のノズルから加圧水を噴射しながら、拡掘治具を当該
地中管に沿って移動させて、地中管の外周と地盤との間
に隙間を生じさせるので、地中管の周面摩擦を著しく低
減させることができる。このため既設管の引き抜き撤去
又は新規に地中管を埋設するに当たり、施工距離の長距
離化、推進設備の小規模化を図ることができるととも
に、推進施工中に発生するスタックトラブルの解消を行
うことができる。EFFECTS OF THE INVENTION According to the present invention, the outer periphery of an existing or newly buried underground pipe is surrounded by an expanding jig, and compressed water is jetted from a plurality of nozzles before and after the expanding jig to expand and repair the underground pipe. Since the tool is moved along the underground pipe to form a gap between the outer circumference of the underground pipe and the ground, the friction of the peripheral surface of the underground pipe can be remarkably reduced. Therefore, when removing the existing pipe or burying a new underground pipe, it is possible to extend the construction distance and reduce the size of the propulsion equipment, and to eliminate stack troubles that occur during propulsion construction. be able to.
【図１】 本発明を既設管引き抜きに適用した実施形態
を示す概略説明図である。FIG. 1 is a schematic explanatory view showing an embodiment in which the present invention is applied to an existing pipe drawing.
【図２】 本発明を非開削による既設管敷設替え工法に
適用した実施形態を示す概略説明図である。FIG. 2 is a schematic explanatory view showing an embodiment in which the present invention is applied to an existing pipe laying replacement method by non-excavation.
【図３】 本発明を長距離曲線推進工法に適用した実施
形態を示す概略説明図である。FIG. 3 is a schematic explanatory view showing an embodiment in which the present invention is applied to a long distance curve propulsion method.
【図４】 本発明に用いる拡掘治具の側面図である。FIG. 4 is a side view of an excavating jig used in the present invention.
【図５】 図４のＡ−Ａ線断面図である。5 is a cross-sectional view taken along the line AA of FIG.
１ 地中管 ２ 地盤 ３ 孔壁 ４ 掘削土砂と加圧水の混合物 ５ 加圧水 ６ 発進立坑 ７ 水中ポンプ ８ 指向性ドリル ９ 拡径ビット １０ 拡掘治具 １１ 前部ノズル １２ 後部ノズル １３ 連通管 １４ 円筒カバー １５ 加圧水 １６ 移動パイプ １７ 容器 1 underground pipe 2 ground 3 hole wall 4 mixture of excavated sediment and pressurized water 5 pressurized water 6 starter shaft 7 submersible pump 8 directional drill 9 expanding bit 10 expanding jig 11 front nozzle 12 rear nozzle 13 communicating pipe 14 cylindrical cover 15 Pressurized water 16 Moving pipe 17 Container
【手続補正書】[Procedure amendment]
【提出日】平成７年１１月２２日[Submission date] November 22, 1995
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図面の簡単な説明[Correction target item name] Brief description of drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【図面の簡単な説明】[Brief description of drawings]
【図１】 本発明を既設管引き抜きに適用した実施形態
を示す概略説明図である。FIG. 1 is a schematic explanatory view showing an embodiment in which the present invention is applied to an existing pipe drawing.
【図２】 本発明を非開削による既設管敷設替え工法に
適用した実施形態を示す概略説明図である。FIG. 2 is a schematic explanatory view showing an embodiment in which the present invention is applied to an existing pipe laying replacement method by non-excavation.
【図３】 本発明を長距離曲線推進工法に適用した実施
形態を示す概略説明図である。FIG. 3 is a schematic explanatory view showing an embodiment in which the present invention is applied to a long distance curve propulsion method.
【図４】 本発明に用いる拡掘治具の側面図である。FIG. 4 is a side view of an excavating jig used in the present invention.
【図５】 図４のＡ−Ａ線断面図である。5 is a cross-sectional view taken along the line AA of FIG.
【図６】 従来の非開削による既設管敷設替え工法を示
す概略説明図である。FIG. 6 is a schematic explanatory view showing a conventional pipe laying replacement method by non-open cutting.
【図７】 従来の長距離曲線推進工法を示す概略説明図
である。FIG. 7 is a schematic explanatory view showing a conventional long-distance curve propulsion method.
【符号の説明】 １ 地中管 ２ 地盤 ３ 孔壁 ４ 掘削土砂と加圧水の混合物 ５ 加圧水 ６ 発進立坑 ７ 水中ポンプ ８ 指向性ドリル ９ 拡径ビット １０ 拡掘治具 １１ 前部ノズル １２ 後部ノズル １３ 連通管 １４ 円筒カバー １５ 加圧水 １６ 移動パイプ １７ 容器[Explanation of symbols] 1 underground pipe 2 ground 3 hole wall 4 mixture of excavated soil and pressurized water 5 pressurized water 6 starter shaft 7 submersible pump 8 directional drill 9 expanding bit 10 expanding jig 11 front nozzle 12 rear nozzle 13 Communication pipe 14 Cylindrical cover 15 Pressurized water 16 Moving pipe 17 Container
Claims (3)
備え、地中管をガイドにして長手方向に移動可能とした
拡掘治具を用い、地上からノズルに加圧水を供給しなが
ら拡掘治具を地中管に沿って移動させることにより、地
中管の周囲の土砂を排除することを特徴とする地中管の
周面摩擦低減方法。1. A pressurized jig is supplied to the nozzle from the ground by using an excavating jig that surrounds the underground pipe, is provided with a plurality of nozzles in front and rear, and is movable in the longitudinal direction with the underground pipe as a guide. A method for reducing friction on the circumferential surface of an underground pipe, which comprises removing an earth and sand around the underground pipe by moving an excavating jig along the underground pipe.
る請求項１に記載の地中管の周面摩擦低減方法。2. The method for reducing friction on the circumferential surface of an underground pipe according to claim 1, wherein the underground pipe is an existing pipe that is pulled out and removed.
に記載の地中管の周面摩擦低減方法。3. The underground pipe is an excavating pipe being propelled.
The method for reducing the friction on the circumferential surface of an underground pipe according to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22269995A JP3519829B2 (en) | 1995-08-08 | 1995-08-08 | Underground pipe peripheral friction reduction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22269995A JP3519829B2 (en) | 1995-08-08 | 1995-08-08 | Underground pipe peripheral friction reduction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0949586A true JPH0949586A (en) | 1997-02-18 |
| JP3519829B2 JP3519829B2 (en) | 2004-04-19 |
Family
ID=16786533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22269995A Expired - Fee Related JP3519829B2 (en) | 1995-08-08 | 1995-08-08 | Underground pipe peripheral friction reduction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3519829B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101284626B1 (en) * | 2013-02-25 | 2013-07-10 | 이종석 | Method for laying sewer pipe using and method for change superannuated pipe using non-excavating |
-
1995
- 1995-08-08 JP JP22269995A patent/JP3519829B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101284626B1 (en) * | 2013-02-25 | 2013-07-10 | 이종석 | Method for laying sewer pipe using and method for change superannuated pipe using non-excavating |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3519829B2 (en) | 2004-04-19 |
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