JP2004144137A - Repairing method of existing pipe - Google Patents

Repairing method of existing pipe Download PDF

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Publication number
JP2004144137A
JP2004144137A JP2002307278A JP2002307278A JP2004144137A JP 2004144137 A JP2004144137 A JP 2004144137A JP 2002307278 A JP2002307278 A JP 2002307278A JP 2002307278 A JP2002307278 A JP 2002307278A JP 2004144137 A JP2004144137 A JP 2004144137A
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Japan
Prior art keywords
pipe
bent
resin
existing
straight
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JP2002307278A
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JP4070575B2 (en
Inventor
Masahiro Yamada
山田　昌弘
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Osaka Gas Co Ltd
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Osaka Gas Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
    • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
    • F16L55/1652—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Pipe Accessories (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repairing method of an existing pipe for ensuring a desired flow rate, by surely preventing occurrence of buckling of a resin pipe at a bent part, even if the bent part of the existing pipe is an elbow pipe bent at a right angle. <P>SOLUTION: In the repairing method of an existing pipe, the resin pipe in a heated and softened state is inserted into the existing pipe P having the bent part E. The resin pipe is constituted of a bent pipe 1 and straight pipes 4 connected to be communicating to both ends of the bent pipe 1. After the straight pipes 4 and the bent pipe 1 of the resin pipe are inserted into the existing pipe P while deforming them by heating and softening so that the bent pipe 1 is positioned in the bent part E, inside of the resin pipe is pressurized to set the straight pipes 4 and the bent pipe 1 straight. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、曲がり部を有する既設管に加熱軟化状態にある樹脂管を挿通して補修する既設管の補修工法に関する。
【０００２】
【従来の技術】
このような補修工法は、例えば、地中に埋設された都市ガス用の既設管を更新するためのもので、従来の工法では、加熱軟化状態にして既設管に挿通する樹脂管として直管を使用し、その樹脂製の直管に既設管の曲がり部で皺が発生するのを抑制するため、樹脂製の直管として既設管の呼び径よりも１ランク小さい呼び径の樹脂管を使用している（例えば、特許文献１参照）。
また、既設管に加熱軟化状態にある樹脂製の直管を挿通した後、樹脂製の直管内に膨張可能な環状チューブを有する拡径具を挿入し、その拡径具を既設管の曲がり部に位置させて膨張させることで、樹脂製の直管にできた皺を押し延ばすものもある（例えば、特許文献２参照）。
【０００３】
【特許文献１】
特開２００１−１５０５４３号公報（第３〜４頁、図１、図２）
【特許文献２】
特開２００１−２７１９６４号公報（第３〜４頁、図１〜図５）
【０００４】
【発明が解決しようとする課題】
しかし、上記特許文献１に開示の工法では、既設管の曲がり部が、直角に屈曲するエルボ管や直角に近い曲がり角度で屈曲するベンド管の場合、その曲がり部において樹脂管が座屈し、座屈部が樹脂管の内方に大きく突出して、樹脂管の内径を狭める結果、更新後において十分な流量が得られなくなる可能性がある。
また、特許文献２に開示の工法でも、曲がり部がエルボ管やそれに近いベンド管の場合、樹脂管が座屈して内方へ突出するため、その後、拡径具の膨張により座屈部を元の状態に伸張することはきわめて困難で、やはり、更新後において十分な流量が得られない結果となる。
【０００５】
本発明は、このような従来の問題点に着目したもので、その目的は、既設管の曲がり部が、たとえ直角に屈曲するエルボ管であっても、曲がり部における樹脂管の座屈発生を確実に回避して、所望どおりの流量を確保できる既設管の補修工法を提供するものである。
【０００６】
【課題を解決するための手段】
請求項１の発明の特徴構成は、曲がり部を有する既設管に加熱軟化状態にある樹脂管を挿通して補修する既設管の補修工法であって、前記樹脂管を曲がり管とその曲がり管の両端に連通接続された直管により構成し、その樹脂管の直管と曲がり管とを加熱軟化状態にして変形させながら前記既設管に挿通して、前記曲がり管を前記曲がり部内に位置させた後、前記樹脂管内を加圧して前記直管および前記曲がり管の変形を矯正するところにある。
【０００７】
請求項１の発明の特徴構成によれば、既設管に挿通する樹脂管を曲がり管とその曲がり管の両端に連通接続された直管により構成して、その直管と曲がり管とを加熱軟化状態にして変形させながら既設管に挿通するので、樹脂管が曲がり管を有するにもかかわらず、既設管への樹脂管の挿通も、また、既設管曲がり部内への曲がり管の挿入も可能となる。
そして、曲がり管を曲がり部内に位置させた状態では、その曲がり管自体が、曲がり部に沿う方向に予め曲がっているので、曲がり管における座屈の発生は確実に回避され、その後、樹脂管内を加圧して直管および曲がり管の変形を矯正するので、既設管への挿入により生じた直管や曲がり管の変形も矯正される。
したがって、既設管の曲がり部がたとえ直角に屈曲するエルボ管であっても、曲がり部における樹脂管の座屈は確実に回避され、所望どおりの流量を確保することができる。
【０００８】
請求項２の発明の特徴構成は、前記曲がり管として、変形抑制用補強部材を有する曲がり管を使用するところにある。
【０００９】
請求項２の発明の特徴構成によれば、樹脂管の曲がり管として、変形抑制用補強部材を有する曲がり管を使用するので、既設管への樹脂管の挿通時あるいは既設管曲がり部内への曲がり管の挿入時には、主として直管の方が変形することになり、したがって、曲がり管の変形量が少なくなって、曲がり部における樹脂管の座屈がより一層確実に回避されるとともに、流量の確保もより確実なものとなる。
【００１０】
請求項３の発明の特徴構成は、前記曲がり管として、前記既設管の曲がり部よりも曲がり角度の小さな曲がり管を使用するところにある。
【００１１】
請求項３の発明の特徴構成によれば、樹脂管の曲がり管として、既設管の曲がり部よりも曲がり角度の小さな管、つまり、直管に近い曲がり管を使用するので、既設管への樹脂管の挿通や既設管曲がり部内への曲がり管の挿入が円滑となり、補修作業を容易、迅速に行うことができる。
【００１２】
【発明の実施の形態】
本発明による既設管の補修工法につき、その実施の形態を図面に基づいて説明する。
この補修工法は、図１に示すように、例えば、地中に埋設された既設管の一例である都市ガス用鋳鉄管や都市ガス用鋼管（以下、既設管と称する）Ｐにおいて、直角に屈曲するエルボ管Ｅを有するもの、換言すると、曲がり角度αが９０度の曲がり部を有するものを対象とし、特に、小さな河川Ｒや地中への埋設物などを避けるため、２つのエルボ管Ｅを有してコの字状に配管された既設管Ｐの更新あるいは更生に最適な工法である。
【００１３】
この補修工法では、図２に示すように、所定の曲がり角度βを有する補修用の曲がり管１が使用され、その曲がり管１は、曲がり角度βの曲管部２とその曲管部２の両端に連設の接続用直管部３とを備え、曲管部２の肉厚Ｔ１が接続用直管部３の肉厚Ｔ２よりも厚くなるように熱可塑性のポリエチレン樹脂により一体的に形成され、接続用直管部３よりも厚い肉厚Ｔ１によって、曲管部２の変形が抑制されるように構成されている。
曲がり管１の接続用直管部３は、樹脂管を構成する直管の一部として機能すると同時に、樹脂管を構成する直管を接続するためのもので、その曲がり管１に接続される直管としては、対象とする既設管Ｐの呼び径よりも１ランク小さい呼び径で、熱可塑性のポリエチレン樹脂で押出し成形により製造された樹脂管４が使用される。
【００１４】
曲がり管１の曲がり角度βは、対象とする既設管Ｐの曲がり部に基づいて設定され、図１に示したように、既設管Ｐの曲がり部における曲がり角度αが９０度のエルボ管Ｅであれば、曲がり管１の曲がり角度βは、９０度よりも小さな角度、例えば、４５度程度に設定される。
曲がり管１における接続用直管部３の肉厚Ｔ２は、既設管Ｐに対して使用される樹脂管４の肉厚に基づいて、樹脂管４の肉厚と接続用直管３の肉厚がほぼ同じ肉厚Ｔ２になるように設定され、接続用直管部３に対して樹脂管４が突き合せ融着されて、上述したように、曲がり管１における曲管部２の肉厚Ｔ１が、その接続用直管部３と樹脂管４の肉厚Ｔ２よりも厚くなるように設定される。
【００１５】
つぎに、曲がり管１や樹脂管４を使用して、地中に埋設された既設管Ｐを更新あるいは更生する補修工法について説明する。
図１においてＡ〜Ｂで示す区間を補修する場合であれば、まず、従来の工法と同様に、補修区間の両端Ａ，Ｂにピットを掘って既設管Ｐを切断し、樹脂管４を巻いたリール、および、スチームや冷却空気を供給する装置などを搭載した作業車を一方Ａのピット近くに配置し、ウインチなどを搭載した作業車を他方Ｂのピット近くに配置する。
その後、通線具などを使用して既設管Ｐに牽引用ワイヤＷを挿通し、樹脂管４に牽引用ワイヤＷの一端を連結し、樹脂管４内にスチームを供給して、樹脂管４と樹脂管４に接続された曲がり管１とを加熱軟化状態にしながら、牽引用ワイヤＷの他端をウインチにより巻き取って、加熱軟化状態にある樹脂管４と曲がり管１を既設管Ｐに挿通する。
【００１６】
この樹脂管４と曲がり管１の挿通時には、図３の（イ）に示すように、主として肉厚の薄い直管、つまり、曲がり管１における接続用直管部３とその直管部３に接続された樹脂管４、そのうちでも特に樹脂管４が扁平に変形して挿通され、曲がり管１のエルボ管Ｅ内への挿入時にも、主として樹脂管４が扁平に変形して挿入され、樹脂管４に接続された２つの曲がり管１は、図３の（ロ）に示すように、２つのエルボ管Ｅ内に円滑に挿入される。
その後、樹脂管４の補修区間Ｂ側の端部を閉じてスチームを供給することにより、樹脂管４内を加圧して、図４に示すように、樹脂管４、曲がり管１の曲管部２、および、曲がり管１の接続用直管部３などの変形を矯正するとともに、スチームに代えて冷却空気を供給することにより、樹脂管４や曲がり管１を冷却硬化させるのである。
【００１７】
〔別実施形態〕
（１）先の実施形態では、２つのエルボ管Ｅを有する既設管Ｐの補修工法について説明したが、エルボ管Ｅをひとつだけ有する既設管Ｐの補修にも適用可能であり、また、既設管Ｐの曲がり部として、曲がり角度αが９０度のエルボ管Ｅを示したが、９０度以外の曲がり角度αを有する各種のベンド管を備えた既設管Ｐの補修にも適用可能である。
そして、使用する曲がり管１については、既設管Ｐにおける曲がり部の曲がり角度αに応じて、その角度αよりも小さな曲がり角度βを有する曲がり管１を使用するのが好ましく、その曲がり角度βについては、接続用直管部３や樹脂管４の肉厚などに応じて適宜選択して決定することになる。
【００１８】
（２）先の実施形態では、補修用の曲がり管１を曲管部２とその曲管部２の両端に連設の接続用直管部３により構成した例を示したが、曲管部２のみ、あるいは、いずれか一方にのみ接続用直管部３を有する曲管部２により曲がり管１を構成することもできる。
また、曲管部２の肉厚Ｔ１を接続用直管部３や樹脂管４の肉厚Ｔ２よりも厚くして、曲管部２における変形を抑制するように構成した例を示したが、曲管部２、接続用直管部３、および、樹脂管４の肉厚を全て同じにし、曲管部２内に補強部材などを埋設して曲管部２の変形を抑制するように構成することもでき、本明細書においては、それらを含めて「変形抑制用補強部材」と総称する。
【００１９】
（３）これまでの実施形態では、既設管Ｐの一例として地中に埋設された都市ガス用鋳鉄管や鋼管を示したが、必ずしも地中に埋設された既設管に限るものではなく、地上に配設された既設管にも適用可能であり、また、ガス管以外の水道管などにも適用可能である。
【図面の簡単な説明】
【図１】既設管の補修工法を示す概略図
【図２】既設管の補修工法に使用する曲がり管の断面図
【図３】既設管の補修工法を示す要部の断面図
【図４】既設管の補修工法を示す要部の断面図
【符号の説明】
１　　　　樹脂管を構成する曲がり管
４　　　　樹脂管を構成する直管
Ｅ　　　　既設管の曲がり部
Ｐ　　　　既設管
α　　　　曲がり部の曲がり角度
β　　　　曲がり管の曲がり角度[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for repairing an existing pipe having a bent portion, in which a resin pipe in a heat-softened state is inserted and repaired.
[0002]
[Prior art]
Such a repair method is, for example, for renewing an existing pipe for city gas buried underground, and in the conventional method, a straight pipe is used as a resin pipe that is inserted into the existing pipe in a heat-softened state. Use a resin pipe with a nominal diameter that is one rank smaller than the nominal diameter of the existing pipe as a resin straight pipe in order to suppress the occurrence of wrinkles at the bent part of the existing pipe. (For example, see Patent Document 1)
Also, after inserting a resin straight pipe in a heated and softened state into the existing pipe, a diameter expanding tool having an expandable annular tube is inserted into the resin straight pipe, and the diameter expanding tool is bent at the bent portion of the existing pipe. There is also a type that expands wrinkles formed in a resin-made straight pipe by expanding it in a position (for example, see Patent Document 2).
[0003]
[Patent Document 1]
JP-A-2001-150543 (pages 3 and 4, FIGS. 1 and 2)
[Patent Document 2]
JP 2001-271964 A (pages 3 and 4, FIGS. 1 to 5)
[0004]
[Problems to be solved by the invention]
However, in the method disclosed in Patent Document 1, when the bent portion of the existing pipe is an elbow pipe bent at a right angle or a bend pipe bent at a bent angle close to a right angle, the resin pipe buckles at the bent portion, and As a result of the bent portion protruding largely inside the resin tube and narrowing the inner diameter of the resin tube, there is a possibility that a sufficient flow rate cannot be obtained after updating.
Also, in the method disclosed in Patent Document 2, when the bent portion is an elbow tube or a bent tube close to the elbow tube, the resin tube buckles and projects inward. It is extremely difficult to expand to the state described above, and again, a sufficient flow rate cannot be obtained after updating.
[0005]
The present invention focuses on such a conventional problem. The purpose of the present invention is to prevent occurrence of buckling of a resin tube in a bent portion even if the bent portion of the existing tube is an elbow tube bent at a right angle. An object of the present invention is to provide a method for repairing an existing pipe which can reliably avoid the flow and secure a desired flow rate.
[0006]
[Means for Solving the Problems]
A feature of the invention according to claim 1 is a method for repairing an existing pipe in which a heat-softened resin pipe is inserted into an existing pipe having a bent portion to repair the same, wherein the resin pipe is a bent pipe and a bent pipe. The straight pipe connected to both ends was connected and connected to the existing pipe while deforming the straight pipe and the bent pipe of the resin pipe in a heated and softened state, and the bent pipe was positioned in the bent section. Thereafter, the inside of the resin pipe is pressurized to correct the deformation of the straight pipe and the bent pipe.
[0007]
According to the characteristic structure of the first aspect of the present invention, the resin pipe to be inserted into the existing pipe is constituted by a bent pipe and straight pipes connected to both ends of the bent pipe, and the straight pipe and the bent pipe are heated and softened. Since it is inserted into the existing pipe while deforming in the state, it is possible to insert the resin pipe into the existing pipe and insert the bent pipe into the existing pipe bent part despite the resin pipe having a bent pipe Become.
And, in a state where the bent pipe is located in the bent portion, the bent pipe itself is bent in advance in a direction along the bent portion, so that occurrence of buckling in the bent pipe is reliably avoided, and thereafter, the inside of the resin pipe is removed. Since the pressurization corrects the deformation of the straight pipe and the bent pipe, the deformation of the straight pipe and the bent pipe caused by the insertion into the existing pipe is also corrected.
Therefore, even if the bent portion of the existing tube is an elbow tube bent at a right angle, buckling of the resin tube at the bent portion is reliably avoided, and a desired flow rate can be secured.
[0008]
A feature of the invention according to claim 2 is that a bent pipe having a deformation suppressing reinforcing member is used as the bent pipe.
[0009]
According to the characteristic configuration of the second aspect of the present invention, since a bent pipe having a deformation suppressing reinforcing member is used as a bent pipe of the resin pipe, the bent pipe is inserted into the existing pipe or bent into the bent section of the existing pipe. When the pipe is inserted, the straight pipe is mainly deformed, so that the amount of deformation of the bent pipe is reduced, and the buckling of the resin pipe at the bent portion is more reliably avoided, and the flow rate is secured. Will be more certain.
[0010]
A feature of the invention according to claim 3 is that a bent pipe having a smaller bending angle than a bent portion of the existing pipe is used as the bent pipe.
[0011]
According to the characteristic configuration of the third aspect of the present invention, since the bent pipe of the resin pipe is a pipe having a smaller bending angle than the bent portion of the existing pipe, that is, a bent pipe close to a straight pipe, the resin to the existing pipe is used. The insertion of the pipe and the insertion of the bent pipe into the existing pipe bend become smooth, and the repair work can be performed easily and quickly.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a method for repairing an existing pipe according to the present invention will be described with reference to the drawings.
In this repair method, as shown in FIG. 1, for example, a cast iron pipe for city gas or a steel pipe for city gas (hereinafter referred to as an existing pipe) P, which is an example of an existing pipe buried underground, is bent at a right angle. In other words, the object is a pipe having an elbow pipe E, in other words, a pipe having a bend with a bending angle α of 90 degrees. In particular, in order to avoid a small river R or an underground object, two elbow pipes E are connected. This method is most suitable for renewing or rehabilitating an existing pipe P having a U-shape.
[0013]
In this repair method, as shown in FIG. 2, a repair bending pipe 1 having a predetermined bending angle β is used, and the bending pipe 1 includes a bending pipe section 2 having a bending angle β and the bending pipe section 2. A connecting straight pipe portion 3 provided continuously at both ends, and is integrally formed of a thermoplastic polyethylene resin so that the thickness T1 of the curved pipe portion 2 is larger than the thickness T2 of the connecting straight pipe portion 3. The wall thickness T1 is larger than the connecting straight pipe portion 3 so that the curved pipe portion 2 is prevented from being deformed.
The connecting straight pipe section 3 of the bent pipe 1 functions as a part of the straight pipe forming the resin pipe, and at the same time, connects the straight pipe forming the resin pipe. The connecting straight pipe section 3 is connected to the bent pipe 1. As the straight pipe, a resin pipe 4 having a nominal diameter one rank smaller than the nominal diameter of the existing existing pipe P to be manufactured and extruded from a thermoplastic polyethylene resin is used.
[0014]
The bending angle β of the bent pipe 1 is set based on the bending portion of the existing pipe P to be processed. As shown in FIG. 1, the elbow pipe E having a bending angle α of 90 degrees at the bending section of the existing pipe P is used. If so, the bending angle β of the bending tube 1 is set to an angle smaller than 90 degrees, for example, about 45 degrees.
The thickness T2 of the connecting straight pipe portion 3 in the bent pipe 1 is based on the thickness of the resin pipe 4 used for the existing pipe P, and the thickness of the resin pipe 4 and the thickness of the connecting straight pipe 3. Are set so as to have substantially the same thickness T2, and the resin pipe 4 is butt-fused to the connecting straight pipe section 3, and as described above, the thickness T1 of the bent pipe section 2 in the bent pipe 1 is set. Is set to be thicker than the wall thickness T2 of the connecting straight pipe portion 3 and the resin pipe 4.
[0015]
Next, a repair method for renewing or rehabilitating an existing pipe P buried in the ground using the bent pipe 1 or the resin pipe 4 will be described.
In the case of repairing sections indicated by AB in FIG. 1, first, pits are dug at both ends A and B of the repair section, the existing pipe P is cut, and the resin pipe 4 is wound. A working vehicle equipped with a reel and a device for supplying steam and cooling air is arranged near the pit of one A, and a working vehicle equipped with a winch and the like is arranged near the pit of the other B.
After that, the tow wire W is inserted into the existing pipe P using a wire passing tool or the like, one end of the tow wire W is connected to the resin pipe 4, and steam is supplied into the resin pipe 4. The other end of the towing wire W is wound by a winch while the bending pipe 1 connected to the resin pipe 4 is heated and softened, and the resin pipe 4 and the bending pipe 1 in the heating softened state are connected to the existing pipe P. Insert.
[0016]
When the resin pipe 4 and the bent pipe 1 are inserted, as shown in FIG. 3A, the straight pipe having a small thickness, that is, the connecting straight pipe part 3 and the straight pipe part 3 in the bent pipe 1 The connected resin pipes 4, in particular, the resin pipe 4 is inserted into the elbow pipe E while being deformed flat, and also when the bent pipe 1 is inserted into the elbow pipe E, the resin pipe 4 is mainly inserted into the elbow pipe E after being deformed flat. The two bent pipes 1 connected to the pipes 4 are smoothly inserted into the two elbow pipes E as shown in FIG.
Thereafter, the end of the resin tube 4 on the repair section B side is closed and steam is supplied to pressurize the inside of the resin tube 4, and as shown in FIG. 2, the deformation of the connecting straight pipe portion 3 of the bent pipe 1 and the like are corrected, and the cooling air is supplied instead of the steam, so that the resin pipe 4 and the bent pipe 1 are cooled and hardened.
[0017]
[Another embodiment]
(1) In the above embodiment, the method of repairing an existing pipe P having two elbow pipes E has been described. However, the present invention is also applicable to the repair of an existing pipe P having only one elbow pipe E. Although the elbow pipe E having a bending angle α of 90 degrees is shown as the bending part of P, the present invention can be applied to repair of an existing pipe P having various bend pipes having a bending angle α other than 90 degrees.
And, for the bent pipe 1 to be used, it is preferable to use the bent pipe 1 having a bending angle β smaller than the angle α according to the bending angle α of the bent portion in the existing pipe P. Is appropriately selected and determined according to the thickness of the connecting straight pipe portion 3 and the resin pipe 4.
[0018]
(2) In the above embodiment, an example is shown in which the bent pipe 1 for repair is constituted by the curved pipe section 2 and the connecting straight pipe sections 3 provided at both ends of the curved pipe section 2. The bent pipe 1 may be constituted by the bent pipe section 2 having the connecting straight pipe section 3 only on one or only one of them.
Also, an example is shown in which the thickness T1 of the curved tube portion 2 is made larger than the thickness T2 of the connecting straight tube portion 3 and the resin tube 4 so as to suppress deformation in the curved tube portion 2. The curved pipe section 2, the connecting straight pipe section 3, and the resin pipe 4 all have the same thickness, and a reinforcing member or the like is embedded in the curved pipe section 2 to suppress the deformation of the curved pipe section 2. In this specification, these are collectively referred to as “deformation suppressing reinforcing members”.
[0019]
(3) In the embodiments described above, as an example of the existing pipe P, a cast iron pipe or a steel pipe for city gas buried underground has been described. The present invention is also applicable to existing pipes installed in the city, and to water pipes other than gas pipes.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a repair method for an existing pipe. FIG. 2 is a cross-sectional view of a bent pipe used in the repair method for an existing pipe. FIG. 3 is a cross-sectional view of a main part showing a repair method for the existing pipe. Sectional view of main part showing repair method for existing pipe
DESCRIPTION OF SYMBOLS 1 Bent tube constituting resin tube 4 Straight tube constituting resin tube E Bent portion of existing tube P Existing tube α Bending angle of bent portion β Bending angle of bent tube

Claims (3)

曲がり部を有する既設管に加熱軟化状態にある樹脂管を挿通して補修する既設管の補修工法であって、
前記樹脂管を曲がり管とその曲がり管の両端に連通接続された直管により構成し、その樹脂管の直管と曲がり管とを加熱軟化状態にして変形させながら前記既設管に挿通して、前記曲がり管を前記曲がり部内に位置させた後、前記樹脂管内を加圧して前記直管および前記曲がり管の変形を矯正する既設管の補修工法。A method for repairing an existing pipe in which a resin pipe in a heat-softened state is inserted into an existing pipe having a bent portion to repair the pipe,
The resin pipe is constituted by a bent pipe and a straight pipe connected to both ends of the bent pipe, and inserted into the existing pipe while deforming the straight pipe and the bent pipe of the resin pipe in a heat-softened state, A method of repairing an existing pipe, in which after the bent pipe is positioned in the bent portion, the inside of the resin pipe is pressurized to correct the deformation of the straight pipe and the bent pipe. 前記曲がり管として、変形抑制用補強部材を有する曲がり管を使用する請求項１に記載の既設管の補修工法。The method for repairing an existing pipe according to claim 1, wherein a bent pipe having a deformation suppressing reinforcing member is used as the bent pipe. 前記曲がり管として、前記既設管の曲がり部よりも曲がり角度の小さな曲がり管を使用する請求項１または２に記載の既設管の補修工法。3. The method for repairing an existing pipe according to claim 1, wherein a bent pipe having a smaller bending angle than a bent portion of the existing pipe is used as the bent pipe. 4.
JP2002307278A 2002-10-22 2002-10-22 Repair method for existing pipes Expired - Fee Related JP4070575B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006266397A (en) * 2005-03-24 2006-10-05 Yasuo Shiraishi Pipe component
JP2008069799A (en) * 2006-09-12 2008-03-27 Asahi Kasei Homes Kk Method and device for correcting buckling of resin pipe
JP2009204014A (en) * 2008-02-26 2009-09-10 Dekku:Kk Method for reclaiming pipe at existing pipe embedded position, and flexible pipe
WO2011119361A2 (en) * 2010-03-24 2011-09-29 Cosban William C Method for repairing and reinforcing underground pipes
EP2839947A4 (en) * 2012-04-12 2016-06-08 Ashimori Ind Co Ltd Lining method for conduit and lining material for conduit

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Publication number Priority date Publication date Assignee Title
KR102154015B1 (en) * 2020-02-12 2020-09-09 박영태 Jig apparatus for restoring a buried pipe and Method thereby

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006266397A (en) * 2005-03-24 2006-10-05 Yasuo Shiraishi Pipe component
JP2008069799A (en) * 2006-09-12 2008-03-27 Asahi Kasei Homes Kk Method and device for correcting buckling of resin pipe
JP2009204014A (en) * 2008-02-26 2009-09-10 Dekku:Kk Method for reclaiming pipe at existing pipe embedded position, and flexible pipe
JP4714760B2 (en) * 2008-02-26 2011-06-29 株式会社デック Pipe rehabilitation method for existing pipe burial sites and new pipes for pipe rehabilitation
WO2011119361A2 (en) * 2010-03-24 2011-09-29 Cosban William C Method for repairing and reinforcing underground pipes
WO2011119361A3 (en) * 2010-03-24 2012-01-05 Cosban William C Method for repairing and reinforcing underground pipes
EP2839947A4 (en) * 2012-04-12 2016-06-08 Ashimori Ind Co Ltd Lining method for conduit and lining material for conduit
US9429265B2 (en) 2012-04-12 2016-08-30 Ashimori Industry Co., Ltd. Lining method for conduit and lining material composite for conduit

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