JP4750610B2 - Rehabilitation of existing pipes - Google Patents

Rehabilitation of existing pipes Download PDF

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JP4750610B2
JP4750610B2 JP2006110862A JP2006110862A JP4750610B2 JP 4750610 B2 JP4750610 B2 JP 4750610B2 JP 2006110862 A JP2006110862 A JP 2006110862A JP 2006110862 A JP2006110862 A JP 2006110862A JP 4750610 B2 JP4750610 B2 JP 4750610B2
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pipe
existing
rehabilitation
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manhole
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JP2007283541A (en
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司 上道
順 津田
弘興 南澤
栄一郎 澤田
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Sekisui Chemical Co Ltd
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Description

この発明は、老朽化した通信ケーブル管や下水道管などの既設管を更生する更生方法に関するものである。   The present invention relates to a rehabilitation method for rehabilitating existing pipes such as aging communication cable pipes and sewer pipes.

従来より、地中に埋設された通信ケーブル管や下水道管などの既設管に、該既設管の内径よりも小径の熱可塑性樹脂からなる更生管を挿入し、該更生管を加熱した後、加圧して拡径させ、更生管を既設管内面にライニングする更生方法が提案され、広く実施されている（例えば、特許文献１参照）。   Conventionally, a rehabilitation pipe made of a thermoplastic resin having a diameter smaller than the inner diameter of the existing pipe is inserted into an existing pipe such as a communication cable pipe or a sewer pipe buried in the ground, and after heating the rehabilitation pipe, A rehabilitation method in which the diameter of the rehabilitation pipe is increased by pressing and the rehabilitation pipe is lined on the inner surface of the existing pipe has been proposed and widely implemented (see, for example, Patent Document 1).

ここで、加熱された更生管は、膨張させた状態で空気や水を利用して冷却固化されるが、更生管の温度が土中温度と同等になるまでには長い時間（約１昼夜）を必要とすることから、更生管の温度が土中温度に到達する前に冷却を完了するようにしている。そして、更生管の温度が土中温度に到達すれば、更生管を既設管の端縁に沿って切断し、切断端縁の仕上げ加工を行うものである。
特開平１１−２３０４１２号公報 Here, the heated rehabilitation pipe is cooled and solidified using air or water in an expanded state, but it takes a long time (about 1 day and night) until the temperature of the rehabilitation pipe becomes equal to the soil temperature. Therefore, the cooling is completed before the temperature of the rehabilitation pipe reaches the soil temperature. And if the temperature of a rehabilitation pipe | tube reaches | attains soil temperature, a rehabilitation pipe | tube will be cut | disconnected along the edge of an existing pipe | tube, and a finishing process of a cutting edge will be performed.
Japanese Patent Laid-Open No. 11-230212

ところで、加熱された更生管の温度が土中温度に到達する前に冷却を完了することから、更生管の温度は土中温度に達するまで徐々に低下し、更生管には、その線膨張の分だけ縮小しようとする力が作用することになる。一方、更生管は加圧されて拡径されることから、既設管の端縁を越えてマンホール側に延出された部分は、既設管の内径以上に大きく膨張している。したがって、更生管の温度が低下する過程で更生管が縮小しようとしても、既設管の内径以上に膨張した既設管の端縁から延出された部分が大きな抵抗となって縮小することができず、土中温度まで温度が低下した更生管には、大きな残留応力が残るものとなる。このため、更生管には、既設管の端縁に沿って切断した施工後においても、収縮しようとする力が働き続けることから、既設管の長さよりも縮小する長さ不足が生じたり、残留応力によって地震などの地盤の変動による更生管の伸び縮みが制限され、更生管が破損する事態を招くおそれがある。   By the way, since cooling is completed before the temperature of the heated rehabilitation pipe reaches the soil temperature, the temperature of the rehabilitation pipe gradually decreases until it reaches the soil temperature, and the rehabilitation pipe has its linear expansion. The force to reduce by that amount will act. On the other hand, since the rehabilitation pipe is pressurized and expanded in diameter, the portion extending to the manhole side beyond the edge of the existing pipe expands more than the inner diameter of the existing pipe. Therefore, even if the rehabilitation pipe tries to shrink in the process of the temperature of the rehabilitation pipe decreasing, the portion extending from the edge of the existing pipe that has expanded beyond the inner diameter of the existing pipe cannot be shrunk due to a large resistance. In the rehabilitated pipe whose temperature is lowered to the soil temperature, a large residual stress remains. For this reason, in the rehabilitated pipe, even after the construction cut along the edge of the existing pipe, the force to be contracted continues to work, so that the length of the existing pipe is reduced or the residual length is reduced. The stress limits the expansion and contraction of the rehabilitation pipe due to ground fluctuations such as earthquakes, which may cause the rehabilitation pipe to break.

本発明は、このような問題点に鑑みてなされたもので、加熱された更生管の温度が土中温度に到達する前に冷却を完了したとしても、更生管の温度が土中温度に達するまで低下することに伴う線膨張による更生管の縮小を許容して残留応力を解消し、施工後の更生管の長さ不足や破損を確実に防止することのできる既設管の更生方法を提供するものである。   The present invention has been made in view of such a problem, and even if the cooling is completed before the temperature of the heated rehabilitation pipe reaches the soil temperature, the temperature of the rehabilitation pipe reaches the soil temperature. To provide a method for rehabilitating existing pipes that can reduce the residual stress by allowing the rehabilitation pipes to shrink due to the linear expansion caused by the decrease in the length of the pipe, and that can reliably prevent the rehabilitation pipe from being insufficient in length or damaged after construction. Is.

本発明は、マンホール間の地中に埋設された既設管に、該既設管の内径よりも小さな外径の熱可塑性樹脂からなる更生管を挿入し、該更生管を加熱した後、加圧して拡径させ、更生管を既設管内面にライニングする既設管の更生方法において、既設管に更生管を挿入するのに先立って、既設管の内径と略等しい外径の拡径抑制管を、マンホール側に一部延出させて既設管のそれぞれの端部に挿着することを特徴とするものである。   The present invention inserts a rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into an existing pipe buried in the ground between manholes, heats the rehabilitation pipe, and then pressurizes it. In the method of rehabilitating an existing pipe that expands the diameter and lining the rehabilitated pipe to the inner surface of the existing pipe, before the rehabilitation pipe is inserted into the existing pipe, an expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is added to the manhole. It is characterized in that it extends partly to the side and is inserted into each end of the existing pipe.

本発明において、拡径抑制管の材質としては、更生管を加圧する際に更生管の膨張を抑える程度の強度があればよく、特に限定されないが、例えば、鉄やアルミなどの金属、塩ビ、ＰＥ、ＰＰ、ナイロンなどのプラスチック、ガラスクロスなどを挙げることができ、施工性やコストを考慮すると、ＰＥやナイロンなどが好ましい。この場合、拡径抑制管の管厚としては、更生管に段差を発生させないように、薄いことが好ましい。また、拡径抑制管を二つ割りに形成し、二つ割りされた拡径抑制管を既設管の各端部にそれぞれ挿着した後、一体に固定するようにしてもよい。   In the present invention, the material of the diameter expansion suppression pipe is not particularly limited as long as it has a strength to suppress expansion of the rehabilitation pipe when pressurizing the rehabilitation pipe, for example, a metal such as iron or aluminum, vinyl chloride, Examples thereof include plastics such as PE, PP, and nylon, and glass cloth. In consideration of workability and cost, PE and nylon are preferable. In this case, it is preferable that the diameter of the expansion suppression pipe is thin so as not to cause a step in the rehabilitation pipe. Further, the diameter expansion suppression pipe may be formed in half, and the divided diameter expansion suppression pipe may be inserted into each end of the existing pipe and then fixed integrally.

本発明によれば、マンホール間の地中に埋設された既設管を更生するときには、各マンホールにおいて、既設管のそれぞれの端部に既設管の内径と略等しい外径に形成された拡径抑制管を挿着する。この際、拡径抑制管の一部を既設管の端縁よりマンホール側に延出させておく。次いで、既設管のそれぞれの端部に挿着された拡径抑制管および既設管にわたって更生管を挿入して加熱した後、更生管を加圧して膨張させ、既設管内面にライニングさせる。この場合、既設管のそれぞれの端部には、マンホール側に一部延出された拡径抑制管が挿着されていることにより、更生管の、既設管の端縁を越えた直後の一定長さ部分は、拡径抑制管によってその内径までに膨張が規制され、拡径抑制管の端縁を越えたところから拡径抑制管の内径を越えて膨張している。そして、膨張した更生管は、その状態で冷却固化され、一定温度に低下すれば、冷却を完了する。その後、既設管の端縁からマンホール側に設定長さ延出させた状態で拡径抑制管とともに更生管を切断する。拡径抑制管および更生管の切断位置は、更生管の温度降下による縮小を考慮して設定される。次いで、更生管の温度が土中温度に到達すれば、既設管の端縁に沿って拡径抑制管および更生管を切断する。   According to the present invention, when the existing pipe buried in the ground between the manholes is rehabilitated, in each manhole, the expansion suppression is formed at each end of the existing pipe to have an outer diameter substantially equal to the inner diameter of the existing pipe. Insert the tube. At this time, a part of the diameter expansion suppression pipe is extended to the manhole side from the edge of the existing pipe. Subsequently, after inserting and heating a diameter expansion suppression pipe inserted in each end of the existing pipe and the existing pipe, the renewed pipe is pressurized and expanded, and is lined on the inner surface of the existing pipe. In this case, a diameter expansion suppression tube partially extending toward the manhole is inserted into each end of the existing tube, so that the rehabilitated tube immediately after the end of the existing tube is fixed. The expansion of the length portion is regulated to the inner diameter by the expansion suppression tube, and the expansion extends beyond the end of the expansion suppression tube beyond the inner diameter of the expansion suppression tube. Then, the expanded rehabilitation pipe is cooled and solidified in that state, and cooling is completed when the temperature is lowered to a certain temperature. Thereafter, the rehabilitation pipe is cut together with the diameter expansion suppression pipe in a state where the set length is extended from the edge of the existing pipe to the manhole side. The cutting positions of the diameter expansion suppression pipe and the rehabilitation pipe are set in consideration of reduction due to the temperature drop of the rehabilitation pipe. Next, when the temperature of the rehabilitation pipe reaches the soil temperature, the diameter expansion suppression pipe and the rehabilitation pipe are cut along the edge of the existing pipe.

この結果、更生管の温度が土中温度まで低下しない状態で冷却を完了したとしても、ほぼ既設管の内径とほぼ等しい外径の更生管が既設管の端縁を越えて一部延出されていることから、更生管の温度が土中温度に達するまで低下し、その線膨張分だけ縮小しようとした場合に、抵抗となることがなく、円滑に縮小することができる。したがって、更生管に残留応力が残ることがなく、施工後において、更生管に長さ不足が生じたり、更生管が破損することを確実に防止することができる。   As a result, even if cooling is completed in a state where the temperature of the rehabilitated pipe does not drop to the soil temperature, a rehabilitated pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended beyond the edge of the existing pipe. Therefore, when the temperature of the rehabilitation pipe is lowered until reaching the temperature in the soil, and it is attempted to reduce the amount corresponding to the linear expansion, it can be smoothly reduced without causing resistance. Therefore, residual stress does not remain in the rehabilitated pipe, and it is possible to reliably prevent the rehabilitated pipe from being short in length or damaged.

なお、二つ割りされた拡径抑制管を用いる場合は、二つ割りされた拡径抑制管を既設管の端部にそれぞれ挿着した後、紐やテープなどで結束して一体に固定し、加圧時に更生管が膨張しないように規制すればよい。そして、ライニングが終了すれば、拡径抑制管の端縁に沿って更生管を切断した後、拡径抑制管の固定を解除することにより、二つ割りされた拡径抑制管を各別に既設管から引き抜くことができる。   In addition, when using a split expansion pipe divided into two, after inserting the split expansion pipe divided into the ends of the existing pipes, they are tied together with a string or tape and fixed together. What is necessary is just to regulate so that a rehabilitation pipe may not expand. When the lining is completed, after cutting the rehabilitation pipe along the edge of the expansion suppression pipe, the fixed expansion of the expansion suppression pipe is released, so that the divided expansion suppression pipes are separated from the existing pipes. Can be pulled out.

本発明は、マンホール間の地中に埋設された既設管に、該既設管の内径よりも小さな外径の熱可塑性樹脂からなる更生管を挿入し、該更生管を加熱した後、加圧して拡径させ、更生管を既設管内面にライニングする既設管の更生方法において、更生管を加熱するのに先立って、既設管の内径と略等しい外径の拡径抑制管を、マンホール側に一部延出させて既設管のそれぞれの端部に挿着することを特徴とするものである。   The present invention inserts a rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into an existing pipe buried in the ground between manholes, heats the rehabilitation pipe, and then pressurizes it. In the method of rehabilitating an existing pipe that expands the diameter and lines the rehabilitated pipe on the inner surface of the existing pipe, before heating the rehabilitated pipe, an expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is connected to the manhole side. It is characterized by extending the part and inserting it into each end of the existing pipe.

本発明において、拡径抑制管の材質としては、更生管を加圧する際に更生管の膨張を抑える程度の強度があればよく、特に限定されないが、例えば、鉄やアルミなどの金属、塩ビ、ＰＥ、ＰＰ、ナイロンなどのプラスチック、ガラスクロスなどを挙げることができ、施工性やコストを考慮すると、ＰＥやナイロンなどが好ましい。この場合、拡径抑制管の管厚としては、更生管に段差を発生させないように、薄いことが好ましい。また、拡径抑制管を二つ割りに形成し、二つ割りされた拡径抑制管を既設管の各端部にそれぞれ挿着した後、一体に固定するようにしてもよい。   In the present invention, the material of the diameter expansion suppression pipe is not particularly limited as long as it has a strength to suppress expansion of the rehabilitation pipe when pressurizing the rehabilitation pipe, for example, a metal such as iron or aluminum, vinyl chloride, Examples thereof include plastics such as PE, PP, and nylon, and glass cloth. In consideration of workability and cost, PE and nylon are preferable. In this case, it is preferable that the diameter of the expansion suppression pipe is thin so as not to cause a step in the rehabilitation pipe. Further, the diameter expansion suppression pipe may be formed in half, and the divided diameter expansion suppression pipe may be inserted into each end of the existing pipe and then fixed integrally.

本発明によれば、マンホール間の地中に埋設された既設管を更生するときには、既設管にわたって更生管を挿入した後、各マンホールにおいて、既設管のそれぞれの端部に既設管の内径と略等しい外径に形成された拡径抑制管を挿着する。この際、拡径抑制管の一部を既設管の端縁よりマンホール側に延出させておく。次いで、更生管を加熱した後、更生管を加圧して膨張させ、既設管内面にライニングさせる。この場合、既設管のそれぞれの端部には、マンホール側に一部延出された拡径抑制管が挿着されていることにより、更生管の、既設管の端縁を越えた直後の一定長さ部分は、拡径抑制管によってその内径までに膨張が規制され、拡径抑制管の端縁を越えたところから拡径抑制管の内径を越えて膨張している。そして、膨張した更生管は、その状態で冷却固化され、一定温度に低下すれば、冷却を完了する。その後、既設管の端縁からマンホール側に設定長さ延出させた状態で拡径抑制管とともに更生管を切断する。拡径抑制管および更生管の切断位置は、更生管の温度降下による縮小を考慮して設定される。次いで、更生管の温度が土中温度に到達すれば、既設管の端縁に沿って拡径抑制管および更生管を切断する。   According to the present invention, when rehabilitating an existing pipe buried in the ground between manholes, after inserting the rehabilitated pipe over the existing pipe, in each manhole, the inner diameter of the existing pipe is approximately equal to each end of the existing pipe. A diameter-increasing suppression tube having an equal outer diameter is inserted. At this time, a part of the diameter expansion suppression pipe is extended to the manhole side from the edge of the existing pipe. Next, after the rehabilitation pipe is heated, the rehabilitation pipe is pressurized and expanded, and is lined on the inner surface of the existing pipe. In this case, a diameter expansion suppression tube partially extending toward the manhole is inserted into each end of the existing tube, so that the rehabilitated tube immediately after the end of the existing tube is fixed. The expansion of the length portion is regulated to the inner diameter by the expansion suppression tube, and the expansion extends beyond the end of the expansion suppression tube beyond the inner diameter of the expansion suppression tube. Then, the expanded rehabilitation pipe is cooled and solidified in that state, and cooling is completed when the temperature is lowered to a certain temperature. Thereafter, the rehabilitation pipe is cut together with the diameter expansion suppression pipe in a state where the set length is extended from the edge of the existing pipe to the manhole side. The cutting positions of the diameter expansion suppression pipe and the rehabilitation pipe are set in consideration of reduction due to the temperature drop of the rehabilitation pipe. Next, when the temperature of the rehabilitation pipe reaches the soil temperature, the diameter expansion suppression pipe and the rehabilitation pipe are cut along the edge of the existing pipe.

この結果、更生管の温度が土中温度まで低下しない状態で冷却を完了したとしても、ほぼ既設管の内径とほぼ等しい外径の更生管が既設管の端縁を越えて一部延出されていることから、更生管の温度が土中温度に達するまで低下し、その線膨張分だけ縮小しようとした場合に、抵抗となることがなく、円滑に縮小することができる。したがって、更生管に残留応力が残ることがなく、施工後において、更生管に長さ不足が生じたり、更生管が破損することを確実に防止することができる。   As a result, even if cooling is completed in a state where the temperature of the rehabilitated pipe does not drop to the soil temperature, a rehabilitated pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended beyond the edge of the existing pipe. Therefore, when the temperature of the rehabilitation pipe is lowered until reaching the temperature in the soil, and it is attempted to reduce the amount corresponding to the linear expansion, it can be smoothly reduced without causing resistance. Therefore, residual stress does not remain in the rehabilitated pipe, and it is possible to reliably prevent the rehabilitated pipe from being short in length or damaged.

なお、二つ割りされた拡径抑制管を用いる場合は、二つ割りされた拡径抑制管を既設管の端部にそれぞれ挿着した後、紐やテープなどで結束して一体に固定し、加圧時に更生管が膨張しないように規制すればよい。そして、ライニングが終了すれば、拡径抑制管の端縁に沿って更生管を切断した後、拡径抑制管の固定を解除することにより、二つ割りされた拡径抑制管を各別に既設管から引き抜くことができる。   In addition, when using a split expansion pipe divided into two, after inserting the split expansion pipe divided into the ends of the existing pipes, they are tied together with a string or tape and fixed together. What is necessary is just to regulate so that a rehabilitation pipe may not expand. When the lining is completed, after cutting the rehabilitation pipe along the edge of the expansion suppression pipe, the fixed expansion of the expansion suppression pipe is released, so that the divided expansion suppression pipes are separated from the existing pipes. Can be pulled out.

本発明は、複数のマンホール間にわたって連通する１本の管路を構成するように、マンホール間の地中にそれぞれ埋設された複数本の既設管に、該既設管の内径よりも小さな外径の熱可塑性樹脂からなる１本の更生管を挿入し、該更生管を加熱した後、加圧して拡径させ、更生管を各既設管内面にライニングする既設管の更生方法において、既設管に更生管を挿入するのに先立って、各マンホールにおいて、既設管の内径と略等しい外径の拡径抑制管を、マンホール側に一部延出させて各既設管のそれぞれの端部に挿着することを特徴とするものである。   The present invention provides a plurality of existing pipes embedded in the ground between manholes with an outer diameter smaller than the inner diameter of the existing pipes so as to constitute one pipe line communicating between the plurality of manholes. In the rehabilitation method for existing pipes, one rehabilitation pipe made of thermoplastic resin is inserted, the rehabilitation pipe is heated and then pressurized to expand the diameter, and the rehabilitation pipe is lined on the inner surface of each existing pipe. Prior to inserting the pipe, in each manhole, an expansion suppressing pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended to the manhole side and inserted into each end of each existing pipe. It is characterized by this.

本発明において、拡径抑制管の材質としては、更生管を加圧する際に更生管の膨張を抑える程度の強度があればよく、特に限定されないが、例えば、鉄やアルミなどの金属、塩ビ、ＰＥ、ＰＰ、ナイロンなどのプラスチック、ガラスクロスなどを挙げることができ、施工性やコストを考慮すると、ＰＥやナイロンなどが好ましい。この場合、拡径抑制管の管厚としては、更生管に段差を発生させないように、薄いことが好ましい。また、拡径抑制管を二つ割りに形成し、二つ割りされた拡径抑制管を既設管の各端部にそれぞれ挿着した後、一体に固定するようにしてもよい。   In the present invention, the material of the diameter expansion suppression pipe is not particularly limited as long as it has a strength to suppress expansion of the rehabilitation pipe when pressurizing the rehabilitation pipe, for example, a metal such as iron or aluminum, vinyl chloride, Examples thereof include plastics such as PE, PP, and nylon, and glass cloth. In consideration of workability and cost, PE and nylon are preferable. In this case, it is preferable that the diameter of the expansion suppression pipe is thin so as not to cause a step in the rehabilitation pipe. Further, the diameter expansion suppression pipe may be formed in half, and the divided diameter expansion suppression pipe may be inserted into each end of the existing pipe and then fixed integrally.

本発明によれば、複数のマンホール間の地中にそれぞれ埋設された複数本の既設管を更生するときには、各マンホールにおいて、各既設管のそれぞれの端部に既設管の内径と略等しい外径に形成された拡径抑制管を順に挿着する。この際、各拡径抑制管の一部を既設管の端縁よりマンホール側に延出させておく。次いで、複数のマンホール間にわたって連通する１本の管路を構成するように、各既設管のそれぞれの端部に挿着された拡径抑制管および既設管にわたって１本の更生管を挿入して加熱した後、更生管を加圧して膨張させ、既設管内面にライニングさせる。この場合、各既設管のそれぞれの端部には、マンホール側に一部延出された拡径抑制管が挿着されていることにより、各マンホールにおいて、更生管の、既設管の端縁を越えた直後の一定長さ部分は、拡径抑制管によってその内径までに膨張が規制され、拡径抑制管の端縁を越えたところから拡径抑制管の内径を越えて膨張している。そして、膨張した更生管は、その状態で冷却固化され、一定温度に低下すれば、冷却を完了する。その後、各マンホールにおいて、各既設管の端縁からマンホール側に設定長さ延出させた状態で拡径抑制管とともに更生管を切断する。拡径抑制管および更生管の切断位置は、更生管の温度降下による縮小を考慮して設定される。次いで、更生管の温度が土中温度に到達すれば、各マンホールにおいて、各既設管の端縁に沿って拡径抑制管および更生管を切断する。   According to the present invention, when renewing a plurality of existing pipes embedded in the ground between a plurality of manholes, the outer diameter of each manhole is substantially equal to the inner diameter of the existing pipe at each end of each existing pipe. Are inserted in order. At this time, a part of each diameter expansion suppression pipe is extended to the manhole side from the edge of the existing pipe. Next, insert one rehabilitation pipe over the diameter expansion suppression pipe inserted into each end of each existing pipe and the existing pipe so as to constitute one pipe line communicating between the plurality of manholes. After heating, the rehabilitated tube is pressurized and expanded to line the inner surface of the existing tube. In this case, the diameter-increasing suppression tube partially extended to the manhole side is inserted into each end portion of each existing tube, so that the end edge of the existing tube of the rehabilitated tube is attached to each manhole. The portion of the fixed length immediately after the expansion is restricted to its inner diameter by the expansion suppression tube, and expands beyond the inner diameter of the expansion suppression tube from beyond the end edge of the expansion suppression tube. Then, the expanded rehabilitation pipe is cooled and solidified in that state, and cooling is completed when the temperature is lowered to a certain temperature. Thereafter, in each manhole, the rehabilitation pipe is cut together with the diameter expansion suppression pipe in a state where the set length is extended from the edge of each existing pipe to the manhole side. The cutting positions of the diameter expansion suppression pipe and the rehabilitation pipe are set in consideration of reduction due to the temperature drop of the rehabilitation pipe. Next, when the temperature of the rehabilitation pipe reaches the soil temperature, the diameter expansion suppression pipe and the rehabilitation pipe are cut along the edge of each existing pipe in each manhole.

この結果、更生管の温度が土中温度まで低下しない状態で冷却を完了したとしても、各マンホールにおいて、ほぼ既設管の内径とほぼ等しい外径の更生管が既設管の端縁を越えて一部延出されていることから、更生管の温度が土中温度に達するまで低下し、その線膨張分だけ縮小しようとした場合に、抵抗となることがなく、円滑に縮小することができる。したがって、更生管に残留応力が残ることがなく、施工後において、更生管に長さ不足が生じたり、更生管が破損することを確実に防止することができる。   As a result, even if the cooling is completed in a state where the temperature of the rehabilitated pipe does not drop to the soil temperature, in each manhole, the rehabilitated pipe having an outer diameter that is substantially equal to the inner diameter of the existing pipe extends beyond the edge of the existing pipe. Since the part is extended, the temperature of the rehabilitation pipe decreases until reaching the temperature in the soil, and when it is attempted to reduce the amount corresponding to the linear expansion, it can be smoothly reduced without causing resistance. Therefore, residual stress does not remain in the rehabilitated pipe, and it is possible to reliably prevent the rehabilitated pipe from being short in length or damaged.

なお、二つ割りされた拡径抑制管を用いる場合は、二つ割りされた拡径抑制管を既設管の端部にそれぞれ挿着した後、紐やテープなどで結束して一体に固定し、加圧時に更生管が膨張しないように規制すればよい。そして、ライニングが終了すれば、拡径抑制管の端縁に沿って更生管を切断した後、拡径抑制管の固定を解除することにより、二つ割りされた拡径抑制管を各別に既設管から引き抜くことができる。   In addition, when using a split expansion pipe divided into two, after inserting the split expansion pipe divided into the ends of the existing pipes, they are tied together with a string or tape and fixed together. What is necessary is just to regulate so that a rehabilitation pipe may not expand. When the lining is completed, after cutting the rehabilitation pipe along the edge of the expansion suppression pipe, the fixed expansion of the expansion suppression pipe is released, so that the divided expansion suppression pipes are separated from the existing pipes. Can be pulled out.

本発明は、複数のマンホール間にわたって連通する１本の管路を構成するように、マンホール間の地中にそれぞれ埋設された複数本の既設管に、該既設管の内径よりも小さな外径の熱可塑性樹脂からなる１本の更生管を挿入し、該更生管を加熱した後、加圧して拡径させ、更生管を各既設管内面にライニングする既設管の更生方法において、更生管を加熱するのに先立って、各マンホールにおいて、既設管の内径と略等しい外径の拡径抑制管を、マンホール側に一部延出させて各既設管のそれぞれの端部に挿着することを特徴とするものである。   The present invention provides a plurality of existing pipes embedded in the ground between manholes with an outer diameter smaller than the inner diameter of the existing pipes so as to constitute one pipe line communicating between the plurality of manholes. In the rehabilitation method for existing pipes, one rehabilitation pipe made of a thermoplastic resin is inserted, the rehabilitation pipe is heated and then pressurized to expand the diameter, and the rehabilitation pipe is lined on the inner surface of each existing pipe. Prior to doing this, in each manhole, an expansion suppression tube having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended to the manhole side and inserted into each end of each existing pipe. It is what.

本発明において、拡径抑制管の材質としては、更生管を加圧する際に更生管の膨張を抑える程度の強度があればよく、特に限定されないが、例えば、鉄やアルミなどの金属、塩ビ、ＰＥ、ＰＰ、ナイロンなどのプラスチック、ガラスクロスなどを挙げることができ、施工性やコストを考慮すると、ＰＥやナイロンなどが好ましい。この場合、拡径抑制管の管厚としては、更生管に段差を発生させないように、薄いことが好ましい。また、拡径抑制管を二つ割りに形成し、二つ割りされた拡径抑制管を既設管の各端部にそれぞれ挿着した後、一体に固定するようにしてもよい。   In the present invention, the material of the diameter expansion suppression pipe is not particularly limited as long as it has a strength to suppress expansion of the rehabilitation pipe when pressurizing the rehabilitation pipe, for example, a metal such as iron or aluminum, vinyl chloride, Examples thereof include plastics such as PE, PP, and nylon, and glass cloth. In consideration of workability and cost, PE and nylon are preferable. In this case, it is preferable that the diameter of the expansion suppression pipe is thin so as not to cause a step in the rehabilitation pipe. Further, the diameter expansion suppression pipe may be formed in half, and the divided diameter expansion suppression pipe may be inserted into each end of the existing pipe and then fixed integrally.

本発明によれば、複数のマンホール間の地中にそれぞれ埋設された複数本の既設管を更生するときには、複数のマンホール間にわたって連通する１本の管路を構成するように、複数本の既設管にわたって１本の更生管を挿入した後、各マンホールにおいて、各既設管のそれぞれの端部に既設管の内径と略等しい外径に形成された拡径抑制管を順に挿着する。この際、各拡径抑制管の一部を既設管の端縁よりマンホール側に延出させておく。次いで、更生管を加熱した後、更生管を加圧して膨張させ、既設管内面にライニングさせる。この場合、各既設管のそれぞれの端部には、マンホール側に一部延出された拡径抑制管が挿着されていることにより、各マンホールにおいて、更生管の、既設管の端縁を越えた直後の一定長さ部分は、拡径抑制管によってその内径までに膨張が規制され、拡径抑制管の端縁を越えたところから拡径抑制管の内径を越えて膨張している。そして、膨張した更生管は、その状態で冷却固化され、一定温度に低下すれば、冷却を完了する。その後、各マンホールにおいて、各既設管の端縁からマンホール側に設定長さ延出させた状態で拡径抑制管とともに更生管を切断する。拡径抑制管および更生管の切断位置は、更生管の温度降下による縮小を考慮して設定される。次いで、更生管の温度が土中温度に到達すれば、各マンホールにおいて、各既設管の端縁に沿って拡径抑制管および更生管を切断する。   According to the present invention, when rehabilitating a plurality of existing pipes respectively buried in the ground between a plurality of manholes, a plurality of existing pipes are formed so as to constitute one pipe line communicating between the plurality of manholes. After inserting one rehabilitation pipe over the pipe, in each manhole, an expansion suppression pipe formed in an outer diameter substantially equal to the inner diameter of the existing pipe is sequentially inserted into each end portion of each existing pipe. At this time, a part of each diameter expansion suppression pipe is extended to the manhole side from the edge of the existing pipe. Next, after the rehabilitation pipe is heated, the rehabilitation pipe is pressurized and expanded, and is lined on the inner surface of the existing pipe. In this case, the diameter-increasing suppression tube partially extended to the manhole side is inserted into each end portion of each existing tube, so that the end edge of the existing tube of the rehabilitated tube is attached to each manhole. The portion of the fixed length immediately after the expansion is restricted to its inner diameter by the expansion suppression tube, and expands beyond the inner diameter of the expansion suppression tube from beyond the end edge of the expansion suppression tube. Then, the expanded rehabilitation pipe is cooled and solidified in that state, and cooling is completed when the temperature is lowered to a certain temperature. Thereafter, in each manhole, the rehabilitation pipe is cut together with the diameter expansion suppression pipe in a state where the set length is extended from the edge of each existing pipe to the manhole side. The cutting positions of the diameter expansion suppression pipe and the rehabilitation pipe are set in consideration of reduction due to the temperature drop of the rehabilitation pipe. Next, when the temperature of the rehabilitation pipe reaches the soil temperature, the diameter expansion suppression pipe and the rehabilitation pipe are cut along the edge of each existing pipe in each manhole.

この結果、更生管の温度が土中温度まで低下しない状態で冷却を完了したとしても、各マンホールにおいて、ほぼ既設管の内径とほぼ等しい外径の更生管が既設管の端縁を越えて一部延出されていることから、更生管の温度が土中温度に達するまで低下し、その線膨張分だけ縮小しようとした場合に、抵抗となることがなく、円滑に縮小することができる。したがって、更生管に残留応力が残ることがなく、施工後において、更生管に長さ不足が生じたり、更生管が破損することを確実に防止することができる。   As a result, even if the cooling is completed in a state where the temperature of the rehabilitated pipe does not drop to the soil temperature, in each manhole, the rehabilitated pipe having an outer diameter that is substantially equal to the inner diameter of the existing pipe extends beyond the edge of the existing pipe. Since the part is extended, the temperature of the rehabilitation pipe decreases until reaching the temperature in the soil, and when it is attempted to reduce the amount corresponding to the linear expansion, it can be smoothly reduced without causing resistance. Therefore, residual stress does not remain in the rehabilitated pipe, and it is possible to reliably prevent the rehabilitated pipe from being short in length or damaged.

なお、発進側のマンホールおよび最下流側のマンホールを除く中間のマンホールにおいては、マンホールを縦断して更生管が延設されていることにより、これらの中間のマンホールにおいては、二つ割りされた拡径抑制管を用いる必要がある。すなわち、二つ割りされた拡径抑制管を既設管の端部にそれぞれ挿着した後、紐やテープなどで結束して一体に固定し、加圧時に更生管が膨張しないように規制すればよい。そして、ライニングが終了すれば、拡径抑制管の端縁に沿って更生管を切断した後、拡径抑制管の固定を解除することにより、二つ割りされた拡径抑制管を各別に既設管から引き抜くことができる。   In the middle manhole except for the manhole on the starting side and the manhole on the most downstream side, the rehabilitation pipe is extended through the manhole, so that the expansion of the diameter divided by two is suppressed in these middle manholes. It is necessary to use a tube. That is, after the divided diameter expansion suppression pipes are inserted into the ends of the existing pipes, they are bound together with a string or tape and fixed together, and the rehabilitation pipes are restricted from expanding during pressurization. When the lining is completed, after cutting the rehabilitation pipe along the edge of the expansion suppression pipe, the fixed expansion of the expansion suppression pipe is released, so that the divided expansion suppression pipes are separated from the existing pipes. Can be pulled out.

本発明によれば、加熱された更生管の温度が土中温度に到達する前に冷却を完了したとしても、更生管の温度が土中温度と均衡するまで低下することに伴う線膨張による更生管の縮小を許容して残留応力を解消し、施工後の更生管の長さ不足や破損を確実に防止することができる。   According to the present invention, even if cooling is completed before the temperature of the heated rehabilitation pipe reaches the soil temperature, rehabilitation due to linear expansion accompanying the decrease of the rehabilitation pipe temperature until it is in equilibrium with the soil temperature. Residual stress can be eliminated by allowing the pipe to shrink, and the rehabilitated pipe can be prevented from being insufficiently short or broken after construction.

以下、本発明の実施の形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１乃至図５には、本発明の既設管の更生方法の一実施形態が示されている。   1 to 5 show an embodiment of the existing pipe rehabilitation method of the present invention.

この更生方法は、隣接するマンホールＭ，Ｍ’間にわたって地中に埋設された既設管Ｓを更生するものであり、まず、図１に示すように、発進側のマンホールＭおよび下流側のマンホールＭ’において、既設管Ｓの内径と略等しい外径に形成された薄肉のプラスチックからなる拡径抑制管１０が、マンホールＭ、Ｍ’側に一半部を延出させた状態で他半部が既設管Ｓのそれぞれの端部に挿着される。   In this rehabilitation method, the existing pipe S buried in the ground between adjacent manholes M and M ′ is rehabilitated. First, as shown in FIG. 1, the manhole M on the start side and the manhole M on the downstream side are provided. ', The expansion suppression tube 10 made of a thin plastic and having an outer diameter substantially equal to the inner diameter of the existing pipe S is provided with the other half of the manhole M and M' extending in the other half. It is inserted into each end of the tube S.

次いで、発進側のマンホールＭから既設管Ｓおよび既設管Ｓのそれぞれの端部に挿着された拡径抑制管１０にわたってワイヤやロープなどの牽引材３を挿通し、予め更生管１の先端部に装着されて該先端開口を密封状態に閉止する先端部材２に牽引材３を連結した後、牽引材３を下流側のマンホールＭ’から牽引することにより、図２に示すように、拡径抑制管１０、既設管Ｓおよび拡径抑制管１０にわたって更生管１を挿入する。   Next, the pulling member 3 such as a wire or a rope is inserted from the manhole M on the starting side to the diameter-increasing suppression tube 10 inserted into each end of the existing pipe S and the existing pipe S, and the distal end portion of the rehabilitated pipe 1 in advance. After the traction member 3 is connected to the tip member 2 that is attached to the tip end and closes the tip opening in a sealed state, the traction member 3 is pulled from the manhole M ′ on the downstream side, thereby expanding the diameter as shown in FIG. The rehabilitation pipe 1 is inserted over the suppression pipe 10, the existing pipe S, and the diameter expansion suppression pipe 10.

ここで、更生管１は、ポリ塩化ビニルや高密度ポリエチレンなどの熱可塑性樹脂によって円筒状に形成されたものであり、既設管Ｓに挿入される前の状態では、その断面形状が既設管Ｓの内径よりも小径の略楕円形状に形成され、形状記憶温度に加熱されることによって元の円筒状に形状回復する性能が付与されている。   Here, the rehabilitation pipe 1 is formed in a cylindrical shape by a thermoplastic resin such as polyvinyl chloride or high-density polyethylene, and in a state before being inserted into the existing pipe S, the cross-sectional shape thereof is the existing pipe S. It is formed in a substantially elliptical shape having a smaller diameter than the inner diameter of the material, and is given the ability to recover its shape to its original cylindrical shape when heated to a shape memory temperature.

拡径抑制管１０、既設管Ｓおよび拡径抑制管１０にわたって更生管１を挿入したならば、詳細には図示しないが、更生管１の後端開口を密封状態に閉止する後端部材を更生管１の後端部に装着した後、図示しない後端部材の接続口に加熱媒体導入管４を接続し、蒸気発生加圧機（図示せず）から加熱媒体導入管４を通して更生管１に水蒸気などの加熱媒体を供給し、更生管１を加熱する。更生管１が形状記憶温度まで加熱されると、元の円筒状に形状回復する。更生管１が円筒状に形状回復すれば、加熱を終了し、蒸気発生加圧機から加熱媒体導入管４を通して更生管１に高圧空気を供給し、軟化された更生管１を加圧し、膨張させる。これにより、拡径した更生管１は、図３に示すように、既設管Ｓの内面に密着する。また、高圧空気の供給に伴って更生管１は冷却されるため、既設管Ｓの内面に密着した状態で更生管１が硬化し、この形状が保持される。これにより、既設管Ｓの内面が更生管１によってライニングされる。   If the rehabilitation pipe 1 is inserted over the diameter expansion suppression pipe 10, the existing pipe S, and the diameter expansion suppression pipe 10, the rear end member that closes the rear end opening of the rehabilitation pipe 1 in a sealed state is renewed, although not shown in detail. After being attached to the rear end of the pipe 1, the heating medium introduction pipe 4 is connected to a connection port of a rear end member (not shown), and steam is supplied to the rehabilitation pipe 1 from the steam generation pressurizer (not shown) through the heating medium introduction pipe 4. A reheating tube 1 is heated by supplying a heating medium such as. When the rehabilitation tube 1 is heated to the shape memory temperature, the shape is restored to the original cylindrical shape. When the rehabilitation pipe 1 recovers to a cylindrical shape, the heating is finished, high-pressure air is supplied from the steam generating pressurizer through the heating medium introduction pipe 4 to the rehabilitation pipe 1, and the softened rehabilitation pipe 1 is pressurized and expanded. . Thereby, the diameter-renewed rehabilitation pipe | tube 1 closely_contact | adheres to the inner surface of the existing pipe | tube S, as shown in FIG. Moreover, since the rehabilitation pipe | tube 1 is cooled with supply of high pressure air, the rehabilitation pipe | tube 1 hardens | cures in the state closely_contact | adhered to the inner surface of the existing pipe | tube S, and this shape is maintained. Thereby, the inner surface of the existing pipe S is lined by the renovated pipe 1.

この場合、高圧空気が供給されて更生管１が膨張するとき、更生管１の、拡径抑制管１０の端縁を越えた部分が、拡径抑制管１０による規制がないため、拡径抑制管１０の内径以上に膨張している。   In this case, when the high pressure air is supplied and the rehabilitation pipe 1 expands, the portion of the rehabilitation pipe 1 beyond the edge of the diameter expansion suppression pipe 10 is not restricted by the diameter expansion suppression pipe 10, so that the diameter expansion suppression is performed. It has expanded beyond the inner diameter of the tube 10.

更生管１による既設管Ｓのライニングが終了すれば、更生管１の温度が土中温度に到達するまでの縮小を考慮して、図４に示すように、マンホールＭ，Ｍ’側に設定長さ延出させて拡径抑制管１０および更生管１を切断する。そして、更生管１の温度が土中温度に到達すれば、図５に示すように、既設管Ｓの端縁に沿って拡径抑制管１０および更生管１を切断し、切断端縁の仕上げ加工を行う。   When the lining of the existing pipe S by the rehabilitation pipe 1 is completed, the length of the rehabilitation pipe 1 is set to the manholes M and M ′ as shown in FIG. 4 in consideration of the reduction until the temperature of the rehabilitation pipe 1 reaches the soil temperature. The diameter expansion suppression tube 10 and the rehabilitation tube 1 are cut by extending the length. And if the temperature of the rehabilitation pipe | tube 1 reaches | attains soil temperature, as shown in FIG. 5, the diameter expansion suppression pipe | tube 10 and the rehabilitation pipe | tube 1 will be cut | disconnected along the edge of the existing pipe | tube S, and finishing of a cutting edge will be carried out. Processing.

なお、前述した実施形態において、詳細には図示しないが、二つ割りされた拡径抑制管を用いることもできる。すなわち、二つ割りの拡径抑制管を用いる場合は、二つ割りされた拡径抑制管を各別に既設管Ｓの端部に挿着した後、テープなどで結束して一体に固定し、更生管１を加圧して膨張させる際、更生管１の膨張を規制する。そして、加圧を停止すれば、更生管１がわずかに縮径することを利用して、拡径抑制管１０の端縁に沿って更生管１を切断した後、二つ割りされた拡径抑制管を各別に既設管Ｓから引き出すとともに、更生管１から取り外すことができる。このため、二つ割りされた拡径抑制管を再利用することができる。そして、更生管１の温度が土中温度まで低下すれば、同様に、既設管Ｓの端縁に沿って更生管１を切断し、端縁の仕上げ加工を行えばよい。   In the above-described embodiment, although not shown in detail, it is also possible to use a two-diameter expansion suppression tube. That is, in the case of using a split expansion suppression pipe divided into two, after the split expansion expansion pipe is inserted into the end of the existing pipe S separately, it is bound with a tape or the like and fixed integrally. When expanding by pressurization, the expansion of the rehabilitation pipe 1 is regulated. And if the pressurization is stopped, the rehabilitation pipe 1 is slightly reduced in diameter, and the rehabilitation pipe 1 is cut along the edge of the expansion prevention pipe 10 and then divided into two. Can be pulled out from the existing pipe S and removed from the rehabilitation pipe 1 separately. For this reason, the diameter expansion suppression pipe divided into two can be reused. And if the temperature of the rehabilitation pipe | tube 1 falls to soil temperature, the rehabilitation pipe | tube 1 should just be cut | disconnected along the edge of the existing pipe S, and the finishing process of an edge should just be performed.

この結果、更生管１の温度が土中温度に達するまでに冷却を完了したとしても、既設管Ｓの端部に該既設管Ｓの内径とほぼ等しい外径の拡径抑制管１０が、既設管Ｓの端縁を越えてマンホールＭ，Ｍ’側に一部延出されて挿着されるとともに、該拡径抑制管１０内に更生管１が挿入されていることから、更生管１の温度が土中温度に達するまで低下し、更生管１がその線膨張分だけ縮小しようとした場合、更生管１の、既設管Ｓの端縁から一部延出された部分は、拡径抑制管１０とともに、または、単独で既設管Ｓ内方に円滑に縮小することができる。したがって、更生管１には、残留応力が残ることがなく、施工後において、更生管１が長さ不足となったり、破損することを確実に防止することができる。   As a result, even if the cooling is completed before the temperature of the rehabilitating pipe 1 reaches the soil temperature, the expansion suppressing pipe 10 having an outer diameter substantially equal to the inner diameter of the existing pipe S is provided at the end of the existing pipe S. Since the tube S extends beyond the edge of the tube S and is partially extended and inserted into the manholes M and M ′, and the rehabilitation tube 1 is inserted into the diameter expansion suppression tube 10, When the temperature decreases until it reaches the soil temperature and the rehabilitation pipe 1 is to be reduced by its linear expansion, the part of the rehabilitation pipe 1 that is partly extended from the edge of the existing pipe S is suppressed from expanding. It can be smoothly reduced inward of the existing pipe S together with the pipe 10 or alone. Therefore, residual stress does not remain in the rehabilitation pipe 1, and it is possible to reliably prevent the rehabilitation pipe 1 from becoming insufficient in length or being damaged after construction.

また、二つ割りされた拡径抑制管１０を採用したときには、拡径抑制管１０が取り外された状態で更生管１の温度が土中温度に達するまで養生することから、更生管１が温度低下に伴ってその線膨張分だけ縮小しようとした場合、更生管１の、既設管Ｓの端縁から一部延出された部分が既設管Ｓ内方に円滑に縮小することができ、同様に、施工後において、更生管１が長さ不足となったり、破損することを確実に防止することができる。   In addition, when the diameter-increasing suppression pipe 10 divided into two is adopted, the temperature of the rehabilitation pipe 1 is cured until the temperature of the rehabilitation pipe 1 reaches the soil temperature with the diameter-expansion suppression pipe 10 removed. Accordingly, when trying to reduce by the linear expansion, the part of the rehabilitation pipe 1 that is partially extended from the edge of the existing pipe S can be smoothly reduced inward of the existing pipe S. It is possible to reliably prevent the rehabilitation pipe 1 from becoming insufficient in length or being damaged after the construction.

なお、前述した実施形態においては、発進側のマンホールＭおよび下流側のマンホールＭ’において、既設管Ｓのそれぞれの端部に拡径抑制管１０を挿着した後、発進側のマンホールＭから更生管１を、拡径抑制管１０、既設管Ｓおよび拡径抑制管１０を経て下流側のマンホールＭ’に挿通する場合を説明したが、図６に示すように、先に発進側のマンホールＭから更生管１を既設管Ｓに挿入して下流側のマンホールＭ’まで導いた後、更生管１を加熱加圧するのに先立って、発進側および下流側のマンホールＭ，Ｍ’において、既設管Ｓのそれぞれの端部に拡径抑制管１０を挿着してもよい（図２参照）。   In the above-described embodiment, after the diameter-increasing suppression pipe 10 is inserted into each end of the existing pipe S in the starting-side manhole M and the downstream-side manhole M ′, the rehabilitation is performed from the starting-side manhole M. Although the case where the pipe 1 is inserted into the manhole M ′ on the downstream side through the diameter expansion suppression pipe 10, the existing pipe S, and the diameter expansion suppression pipe 10 has been described, as shown in FIG. After the rehabilitation pipe 1 is inserted into the existing pipe S and led to the manhole M ′ on the downstream side, the existing pipes are installed in the manholes M and M ′ on the starting side and downstream before the rehabilitation pipe 1 is heated and pressurized. You may insert the diameter expansion suppression pipe | tube 10 in each edge part of S (refer FIG. 2).

この場合、先端部材２や後端部材との干渉を避けて円滑に挿着するため、二つ割りされた拡径抑制管を採用し、二つ割りされた拡径抑制管を各別に既設管Ｓのそれぞれの端部に挿着した後、離脱しないようにテープなどで結束して一体に固定して使用することが好ましい。   In this case, in order to smoothly insert and avoid interference with the front end member 2 and the rear end member, a split expansion pipe divided into two parts is adopted, and the split expansion pipe divided into two is provided for each of the existing pipes S. After being attached to the end portion, it is preferable to use it by being bound with a tape or the like so as not to be detached and fixed integrally.

この後、更生管１を加熱するとともに、加圧して拡径させ、既設管Ｓの内面にライニングする点は、先に説明した通りであり、その詳細な説明を省略する。   Thereafter, the rehabilitation pipe 1 is heated, pressurized and expanded in diameter, and lined on the inner surface of the existing pipe S as described above, and detailed description thereof is omitted.

また、前述した実施形態においては、隣接するマンホールＭ，Ｍ’間に敷設された１本の既設管Ｓを更生する場合を例示したが、３個の以上のマンホールにわたる複数本の既設管を１本の更生管によって更生するようにしてもよい。   Further, in the above-described embodiment, the case where one existing pipe S laid between adjacent manholes M and M ′ is renewed has been illustrated, but a plurality of existing pipes extending over three or more manholes are defined as one. You may make it rehabilitate by the rehabilitation pipe of a book.

具体的には、図７に示すように、発進側のマンホールＭ、最下流側のマンホールＭ’およびこれらの発進側のマンホールＭと最下流側のマンホールＭ’との間の１個以上の中間のマンホールＭ”が配設されている場合の既設管Ｓの更生に際して、各マンホールＭ，Ｍ”，Ｍ’において、各既設管Ｓのそれぞれの端部に拡径抑制管１０を順に挿着した後、発進側のマンホールＭから中間のマンホールＭ”を経て最下流側のマンホールＭ’にわたって連通する１本の管路を構成するように、更生管１を、それの端部に拡径抑制管１０が挿着された複数本の既設管Ｓに挿入し、あるいは、発進側のマンホールＭから中間のマンホールＭ”を経て最下流側のマンホールＭ’にわたって連通する１本の管路を構成するように、更生管１を複数本の既設管Ｓにわたって挿入した後、発進側のマンホールＭ、最下流側のマンホールＭ’およびこれらの発進側、最下流側のマンホールＭ，Ｍ’間の中間のマンホールＭ”において、各既設管Ｓのそれぞれの端部に拡径抑制管１０を順に挿着し、更生管１の加熱加圧に先立って作業を行えばよい。   Specifically, as shown in FIG. 7, the manhole M on the start side, the manhole M ′ on the most downstream side, and one or more intermediate points between the manhole M on the start side and the manhole M ′ on the most downstream side In the rehabilitation of the existing pipes S when the manholes M ″ are arranged, the diameter expansion suppression pipes 10 are sequentially inserted into the respective end portions of the existing pipes S in the respective manholes M, M ″, M ′. After that, the rehabilitation pipe 1 is connected to the manhole M on the downstream side through the manhole M ′ on the downstream side and the manhole M ′ on the most downstream side, so that the rehabilitation pipe 1 is connected to the end of the diameter expansion suppression pipe. 10 is inserted into a plurality of existing pipes S, or one pipe line communicating from the starting manhole M through the intermediate manhole M ″ to the most downstream manhole M ′ is formed. In addition, rehabilitation pipe 1 is installed in multiple existing pipes Are inserted in the manhole M on the start side, the manhole M ′ on the most downstream side, and the manhole M ″ between the start side and the manholes M and M ′ on the start side and the most downstream side, respectively. What is necessary is just to insert the diameter expansion suppression pipe | tube 10 in a part in order, and work before the heating pressurization of the rehabilitation pipe | tube 1. FIG.

なお、後者の施工方法の場合、中間のマンホールＭ”においては、更生管１が内部を縦断していることから、二つ割りされた拡径抑制管を採用する必要がある。   In the case of the latter construction method, in the intermediate manhole M ″, since the rehabilitation pipe 1 is cut through the inside, it is necessary to adopt a diameter expansion suppression pipe divided in two.

この後、１本の更生管１を加熱するとともに、加圧して拡径させ、冷却させて既設管Ｓの内面にライニングした後、各マンホールＭ，Ｍ”，Ｍ’において、更生管１の縮小代を確保して拡径抑制管１０とともに更生管１を切断し、あるいは、二つ割りされた拡径抑制管の端縁に沿って更生管１を切断して二つ割りされた拡径抑制管を抜き出し、更生管１の温度が土中温度に低下するまで養生させた後、最終的に既設管Ｓの端縁に沿って更生管１を拡径抑制管１０とともに、あるいは、単独で切断すればよい。   Thereafter, one rehabilitating pipe 1 is heated, pressurized, expanded in diameter, cooled and lined on the inner surface of the existing pipe S, and then the rehabilitating pipe 1 is reduced in each manhole M, M ″, M ′. Securing the allowance, cutting the rehabilitation pipe 1 together with the diameter expansion suppression pipe 10, or cutting the rehabilitation pipe 1 along the edge of the diameter expansion suppression pipe divided into two and extracting the diameter expansion suppression pipe divided into two; After curing the rehabilitation pipe 1 until the temperature of the rehabilitation pipe 1 is lowered to the soil temperature, the rehabilitation pipe 1 may be finally cut along the edge of the existing pipe S together with the diameter expansion suppression pipe 10 or independently.

このように、複数個のマンホールＭ，Ｍ”，Ｍ’にわたる複数本の既設管Ｓを同時に更生することができることから、作業効率を向上させることができる。   Thus, since a plurality of existing pipes S extending over a plurality of manholes M, M ″, M ′ can be renewed at the same time, work efficiency can be improved.

以上のように本発明によれば、更生管の温度が土中温度に達するまで低下することに伴う線膨張による更生管の縮小を許容して残留応力を解消し、施工後の更生管の長さ不足や破損を確実に防止することができることから、長期にわたって更生管を維持することができるものとなる。   As described above, according to the present invention, the residual stress is eliminated by allowing reduction of the rehabilitation pipe due to linear expansion accompanying the decrease in the temperature of the rehabilitation pipe until reaching the temperature in the soil, and the length of the rehabilitation pipe after construction is increased. Since the shortage and breakage can be reliably prevented, the rehabilitation pipe can be maintained over a long period of time.

本発明の既設管の更生方法の一実施形態の施工要領を説明する工程図である。It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. 本発明の既設管の更生方法の一実施形態の施工要領を説明する工程図である。It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. 本発明の既設管の更生方法の一実施形態の施工要領を説明する工程図である。It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. 本発明の既設管の更生方法の一実施形態の施工要領を説明する工程図である。It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. 本発明の既設管の更生方法の一実施形態の施工要領を説明する工程図である。It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. 本発明の既設管の更生方法の他の実施形態の施工要領を説明する工程図である。It is process drawing explaining the construction point of other embodiment of the rehabilitation method of the existing pipe | tube of this invention. 本発明の既設管の更生方法のもう一つの実施形態の施工要領を説明する工程図である。It is process drawing explaining the construction point of another embodiment of the rehabilitation method of the existing pipe | tube of this invention.

符号の説明Explanation of symbols

１ 更生管
１０ 拡径抑制管
Ｍ，Ｍ’，Ｍ” マンホール
Ｓ 既設管 1 Rehabilitation pipe 10 Expansion control pipe M, M ', M "Manhole S Existing pipe

Claims (4)

マンホール間の地中に埋設された既設管に、該既設管の内径よりも小さな外径の熱可塑性樹脂からなる更生管を挿入し、該更生管を加熱した後、加圧して拡径させ、更生管を既設管内面にライニングする既設管の更生方法において、既設管に更生管を挿入するのに先立って、既設管の内径と略等しい外径の拡径抑制管を、マンホール側に一部延出させて既設管のそれぞれの端部に挿着することを特徴とする既設管の更生方法。   Insert a rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into the existing pipe buried in the ground between manholes, and after heating the rehabilitation pipe, pressurize to expand the diameter, In the rehabilitation method for an existing pipe that lines the rehabilitation pipe on the inner surface of the existing pipe, before the rehabilitation pipe is inserted into the existing pipe, a part of the expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is provided on the manhole side. A method for rehabilitating an existing pipe, characterized by being extended and inserted into each end of the existing pipe. マンホール間の地中に埋設された既設管に、該既設管の内径よりも小さな外径の熱可塑性樹脂からなる更生管を挿入し、該更生管を加熱した後、加圧して拡径させ、更生管を既設管内面にライニングする既設管の更生方法において、更生管を加熱するのに先立って、既設管の内径と略等しい外径の拡径抑制管を、マンホール側に一部延出させて既設管のそれぞれの端部に挿着することを特徴とする既設管の更生方法。   Insert a rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into the existing pipe buried in the ground between manholes, and after heating the rehabilitation pipe, pressurize to expand the diameter, In the method of rehabilitating an existing pipe that lines the rehabilitated pipe to the inner surface of the existing pipe, before the rehabilitated pipe is heated, a part of the expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is extended to the manhole side. A method for rehabilitating an existing pipe, which is inserted into each end of the existing pipe. 複数のマンホール間にわたって連通する１本の管路を構成するように、マンホール間の地中にそれぞれ埋設された複数本の既設管に、該既設管の内径よりも小さな外径の熱可塑性樹脂からなる１本の更生管を挿入し、該更生管を加熱した後、加圧して拡径させ、更生管を各既設管内面にライニングする既設管の更生方法において、既設管に更生管を挿入するのに先立って、各マンホールにおいて、既設管の内径と略等しい外径の拡径抑制管を、マンホール側に一部延出させて各既設管のそれぞれの端部に挿着することを特徴とする既設管の更生方法。   From a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipes, a plurality of existing pipes embedded in the ground between the manholes are formed so as to constitute one pipe line communicating between the plurality of manholes. In the rehabilitation method for existing pipes, the rehabilitation pipe is inserted into the existing pipe by inserting the one rehabilitation pipe, heating the rehabilitation pipe, then pressurizing and expanding the diameter, and lining the rehabilitation pipe on the inner surface of each existing pipe. Prior to the above, each manhole is characterized in that a diameter expansion suppression tube having an outer diameter substantially equal to the inner diameter of the existing tube is partially extended to the manhole side and inserted into each end portion of each existing tube. How to rehabilitate existing pipes. 複数のマンホール間にわたって連通する１本の管路を構成するように、マンホール間の地中にそれぞれ埋設された複数本の既設管に、該既設管の内径よりも小さな外径の熱可塑性樹脂からなる１本の更生管を挿入し、該更生管を加熱した後、加圧して拡径させ、更生管を各既設管内面にライニングする既設管の更生方法において、更生管を加熱するのに先立って、各マンホールにおいて、既設管の内径と略等しい外径の拡径抑制管を、マンホール側に一部延出させて各既設管のそれぞれの端部に挿着することを特徴とする既設管の更生方法。   From a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipes, a plurality of existing pipes embedded in the ground between the manholes are formed so as to constitute one pipe line communicating between the plurality of manholes. Prior to heating the rehabilitating pipe in the rehabilitating method for existing pipes, in which the rehabilitating pipe is inserted, and the rehabilitation pipe is heated and then pressurized to expand the diameter, and the rehabilitation pipe is lined on the inner surface of each existing pipe. In each manhole, the existing pipe is characterized in that a diameter expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended to the manhole side and inserted into each end portion of each existing pipe. Rehabilitation method.
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