JP4615756B2 - Rehabilitation pipe inspection method - Google Patents

Rehabilitation pipe inspection method Download PDF

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Publication number
JP4615756B2
JP4615756B2 JP2001107355A JP2001107355A JP4615756B2 JP 4615756 B2 JP4615756 B2 JP 4615756B2 JP 2001107355 A JP2001107355 A JP 2001107355A JP 2001107355 A JP2001107355 A JP 2001107355A JP 4615756 B2 JP4615756 B2 JP 4615756B2
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pipe
rehabilitation
existing
inspection port
branch
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JP2002301766A (en
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充彦 渡辺
周平 幸丸
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積水化学工業株式会社
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【0001】
【発明の属する技術分野】
本発明は、地下に埋設されている既設管の内面を更生管によりライニングする際に、既設管に設けられた点検口を更生する点検口更生方法に関するものである。
【0002】
【従来の技術】
一般に、鉄筋コンクリート管(ヒューム管)や鋼管などからなる老朽化した既設管は、その内部に、所定長の口径の小さい新たな樹脂管を順次接続しながら挿入していって更生管を敷設し、既設管との間隙にモルタルや発泡性樹脂材等の裏込め材を注入してシールすることによって、更生することが行われている。
【0003】
このように、裏込め材を使用して更生する場合、更生管の内径が既設管の内径よりもかなり小さくなるために、有効流量が低下してしまうという問題点があり、又、所定長の樹脂管を順次接続しながら更生管を敷設したり、既設管との間隙に裏込め材を注入してシールする必要があるため、作業性が悪く、更生工事が迅速に行えない。
【0004】
かかる点から、例えば、特開平1−56531号公報に開示されるように、下水管路等の既設管の内面に、熱可塑性樹脂製の形状回復温度において円筒形に形状回復性を有するように襞状に縮退させた断面形状を呈するパイプライナーを引き込んで、加熱膨張により円形に復元して既設管内面をライニングするようにしたものが提案されている。
【0005】
【発明が解決しようとする課題】
ところで、既設管を地上に対し開口させるマンホールやマスなどの点検口も既設管と同様に径年劣化などによって老朽化するため、点検口を更生したいという要求がある。
【0006】
その場合、既設管を更生管によって更生する作業と同様に、マンホールやマスよりなる点検口の内部に新規のマンホールやマスを取り付けて更生することが考えられる。しかしながら、既設管を更生した更生管に対し新規のマンホールやマスを接続するに当たって継ぎ手が必要となり、更生管に対する漏水が危惧されることになる。
【0007】
しかも、このような点検口の更生作業は、更生管による既設管の更生作業と前後して行われるため、作業効率が著しく悪いものとなる。
【0008】
本発明は、かかる点に鑑みてなされたものであり、その目的とするところは、更生管に対する漏水を防止し、かつ更生管による既設管の更生と点検口の更生とが同時に効率よく行うことができる更生管の点検口更生方法を提供することにある。
【0009】
【課題を解決するための手段】
上記目的を達成するため、本発明では、地下に埋設されている既設管の内面を更生管によりライニングするものを対象とする。
【0010】
具体的には、地下に埋設した既設管の内面を更生管によりライニングする際に、上記既設管に設けられた点検口を更生する点検口更生方法として、3分岐管設置工程と更生管敷設工程とライニング工程と孔開け工程とを備えさせる。3分岐管設置工程では、更生管によりライニングされる既設管の途中位置に、点検口を位置付けておくとともに、この点検口に対応するように上方に開口する上方開口孔および該上方開口孔を既設管の両端側に連通させるように既設管の両端側向きに貫通する貫通孔を備えた3分岐管を設置する。更生管敷設工程では、既設管の一端側から導入した更生管を上記3分岐管の貫通孔内に挿通させて既設管の他端側に導出させ、既設管内および3分岐管内に更生管を敷設する。ライニング工程では、更生管内に蒸気を導入して更生管を加熱した後、更生管内に圧縮空気を送給して更生管を加圧膨張させることにより既設管および3分岐管の内面に更生管を密着させてライニングする。孔開け工程では、上記更生管における3分岐管の上方開口孔と対応する箇所に上方から新点検口を孔開けする。
【0011】
この特定事項により、既設管途中位置の点検口に3分岐管を設置し、その3分岐管の貫通孔内に更生管を挿通させて敷設した状態で、既設管および3分岐管の内面に更生管を密着させてライニングしてから、更生管における3分岐管の上方開口孔と対応する箇所に上方から新点検口を孔開けすれば、点検口の更生作業が完了することになる。このため、マンホールやマスよりなる点検口の内部に新規のマンホールやマスを取り付けて点検口を更生する場合に必要であった継ぎ手が不要となり、更生管に対する漏水を防止することが可能となる。その上、点検口の更生作業と、更生管による既設管の更生作業とが前後することなく同時に行われ、点検口の更生作業が効率よく行えることになる。
【0012】
特に、更生管に対する漏水をより確実に防止し得るものとして、以下の構成が掲げられる。
【0013】
つまり、更生管敷設工程完了後に、3分岐管の上方開口孔の周囲に対し更生管の新点検口をシールするシール工程を備えさせている。
【0014】
この特定事項により、更生管の新点検口が3分岐管の上方開口孔の周囲に対しシールされて、更生管に対する漏水をより確実に防止することが可能となる。
【0015】
【発明の実施の形態】
本発明の実施の形態を図に基づいて説明する。
【0016】
図1は本発明に係わる点検口更生方法において使用される更生管を示し、この更生管1は、塩化ビニルや高密度ポリエチレン等の熱可塑性樹脂製であって、外面に長手方向に沿って延びる凹部11を有するように変形されて断面外形面積が小さくなる襞状に縮退させた形状に成形されている。また、この更生管1は、所定の形状回復温度(例えば80℃)に加熱されることによって円筒体に形状回復する性能を有している。この場合、形状回復温度とは、圧力などの外力を作用させることなく、加熱のみで円筒形に形状回復する温度のことである。
【0017】
この更生管1の製造方法は以下のとおりである。図2に示すように、先ず、押出機21にて熱可塑性樹脂材料の円筒体10を押出成形し、その円筒体10を冷却水槽22中に通過させて冷却し、変形装置23にて、形状回復温度の雰囲気中で外面を押し潰して、図1に示す如く外面に長手方向に沿って延びる凹部11を形成する。その後、断面外形面積が減少するように引張装置24にて円筒体10を引っ張り、この円筒体10を、トラバース部25を経由して、ドラム26上に巻き取る。
【0018】
このようにして製造された更生管1は、既設管の更生現場に搬入されるまでの間は、外気温の影響を受けて管自身が「自然形状回復」することがないように、拘束手段を用いて拘束するか、低温保管することが好ましい。
【0019】
−更生作業−
次に、既設管および点検口の更生作業について説明する。
【0020】
ここでは、図3に示すように、上流側マンホールQ1(図3において左側に位置するマンホール)と下流側マンホールQ2(図3において右側に位置するマンホール)との間に埋設されている既設管3を更生する場合について説明する。この場合、上流側マンホールQ1と下流側マンホールQ2との間に位置する既設管3の途中位置には単一の点検口Tが設けられ、この点検口Tは、既設管3を地上に開口させるマスMによって構成されている。
【0021】
本形態における更生作業では、更生管1による既設管3の更生作業と、点検口Tの更生作業とが同時進行により行われる。
【0022】
上流側マンホールQ1付近の地上には、上記ドラム26上に巻き取られた更生管1が搬入されている。一方、下流側マンホールQ2付近の地上には、ウィンチ51が配設されている。また、下流側マンホールQ2の下部には更生管1を牽引するワイヤ54を案内するためのガイド部52が設けられている。尚、更生管1を既設管3に挿入するのに先立って、予め、既設管3の内部を洗浄し且つ突出物を除去しておく。
【0023】
先ず、3分岐管設置工程として、更生管1によりライニングされる既設管3の途中位置に合成樹脂よりなる3分岐管4を設置する。具体的には、3分岐管4を、その上方に開口する上方開口孔41を点検口T(マスM)に対応させると共に、この上方開口孔41を既設管3の両端側(上流側マンホールQ1側および下流側マンホールQ2側)に連通させるように既設管3の両端側向きに貫通する貫通孔42を対応させるように、既設管3の下面に設けられた凹部31内に設置する。この場合、3分岐管4は、その貫通孔42の内径が既設管3の内径と一致する大きさに形成されている一方、図4に示すように、上方開口孔41の内径は貫通孔42の内径よりも大径に形成されてなり、既設管3内の底部に設置された際に貫通孔42を既設管3に対し合致させるようになされている。また、図5および図6に示すように、3分岐管4の上方開口孔41の周囲には、貫通孔42の付近に回り込んで更生管1の新点検口12(後述する)をシールする環状のゴム輪45が設けられている。
【0024】
次いで、更生管敷設工程として、図3に示すように、ウインチ51から導出されるワイヤ54の先端を、下流側マンホールQ2の下端から既設管3内および3分岐管4の連通孔42を経て上流側マンホールQ1の下端に導いておく。それから、ドラム26を回転させ、更生管1の先端を上流側マンホールQ1の下端つまり既設管3の上流側端まで導出させる。そして、上流側マンホールQ1内で、更生管1の先端に先端具53を取り付けると共に、この先端具53に、ウインチ51から延びるワイヤ54の先端を係止する。その後、ドラム26から送り出された更生管1の先端を既設管3の内部に挿入した状態で、ウィンチ51によってワイヤ54を巻き取ることにより更生管1を牽引し、更生管1を既設管3の内部に引き込んでいく。この動作により、更生管1を、上流側マンホールQ1側から下流側マンホールQ2側まで3分岐管4の貫通孔42を介して導いて、上流側マンホールQ1と下流側マンホールQ2との間を結ぶ既設管3内の全長に亘って敷設する。この際の既設管3内における更生管1の配置状態を図7(a)に示す。
【0025】
その後、ライニング工程に進む。このライニング工程では、図8に示すように、上流側マンホールQ1付近の地上に、蒸気発生・加圧器55を配設し、下流側マンホールQ2付近の地上に水・蒸気分離器56を配設する。更生管1の後端にエルボ57を連結し、そのエルボ57に蒸気発生・加圧器55から延びるホース55aを連結するともに、更生管1先端の先端具53に水・蒸気分離器56から延びるホース56aを連結する。また、エルボ57及び先端具53には図示しない温度センサーを取り付けておく。この状態で、蒸気発生・加圧器55より更生管1内に蒸気を連続的に供給し、その蒸気を水・蒸気分離器56へ流下させつつ、更生管1をその内部より形状回復温度まで加熱して、略元の円筒体に形状回復させる。この際の既設管3内における更生管1の状態を図7(b)に示す。
【0026】
このようにして更生管1を円筒体に形状回復させた後、先端具53を密閉状態にし、その更生管1の内部に蒸気発生・加圧器55より圧縮空気を送って、図9に示すように、更生管1を、その内部より加圧膨張させて既設管3の内面および貫通孔42の内面に密着させ(この際の既設管3内における更生管1の状態を図7(c)に示す)、この加圧状態にて、冷却固定して、既設管3の内面のライニング作業を終了する。このとき、3分岐管4の上方開口孔41周囲において貫通孔42の付近に回り込むゴム輪45は、更生管1の加圧膨張によって3分岐管4の上方開口孔41周囲に対し水密性を確保し得る状態に圧接され、更生管1の新点検口12(後述する)をシールするシール工程が行われる。
【0027】
それから、孔開け工程として、図10に示すように、更生管1における3分岐管4の上方開口孔41と対応する箇所に、図示しないエンドミルなどの加工具を備えた孔開け装置によって上方から新点検口12を孔開けする。この場合、新点検口12に対し上下方向に延びる管K(図10に二点鎖線で示す)の下端を接続し、その管Kの周囲を埋めるようにしてもよい。
【0028】
−実施形態の効果−
以上説明したように、本形態における更生管1の点検口更生方法では、既設管3途中位置の点検口Tに3分岐管4を設置し、その3分岐管4の貫通孔42内に更生管1を挿通させて敷設した状態で、既設管3および3分岐管4の内面に更生管1を密着させてライニングしてから、更生管1における3分岐管4の上方開口孔41と対応する箇所に上方から新点検口12を孔開けすれば、点検口Tの更生作業が完了することになる。このため、マンホールやマスよりなる点検口の内部に新規のマンホールやマスを取り付けて点検口を更生する場合に必要であった継ぎ手が不要となる。その上、3分岐管4の上方開口孔41周囲において貫通孔42の付近に回り込むゴム輪45によって、更生管1の新点検口12がシールされている。これにより、更生管1に対する漏水を確実に防止することができる。
【0029】
しかも、3分岐管4の上方開口孔41周囲において貫通孔42の付近に回り込ませて取り付けたゴム輪45は、更生管1の加圧膨張によって3分岐管4の上方開口孔41周囲に対し水密性を確保し得る状態に圧接されるので、シール材を塗布してシールするもののように煩わしい作業を講じる必要がなく、更生管の加圧膨張によってシール工程が同時に行われ、シール工程の簡単化を図ることができる。
【0030】
また、点検口Tの更生作業と、更生管1による既設管3の更生作業とが前後することなく同時進行して行われ、点検口Tの更生作業を効率よく行うことができる。
【0031】
−他の実施の形態−
なお、本発明は上記実施形態に限定されるものではなく、その他種々の変形例を包含している。例えば、本実施形態では、3分岐管4の上方開口孔41周囲に取り付けたゴム輪45によるシール工程を、ライニング工程での更生管1の加圧膨張によってライニング工程と同時に行えるようにしたが、更生管敷設工程直後に3分岐管の上方開口孔周囲に接着剤を塗布するシール工程を行い、ライニング工程での更生管の加圧膨張によって接着剤によるシールが行われるようにしてもよい。
【0032】
また、本実施形態では、上流側マンホールQ1と下流側マンホールQ2との間の既設管3の途中位置に位置付けたマスMよりなる単一の点検口Tを更生する場合について述べたが、上流側マンホールと下流側マンホールとの間の既設管の途中位置にマスやマンホールよりなる複数の点検口を更生する場合についても適用できるのはもちろんである。
【0033】
【発明の効果】
以上のように、本発明では、既設管途中位置の点検口に3分岐管を設置し、その3分岐管の貫通孔内に更生管を挿通させて敷設した状態で、更生管によるライニングを行って、更生管における3分岐管の上方開口孔と対応する箇所に上方から新点検口を孔開けすれば、点検口の更生作業を行えることにより、継ぎ手を設けることなく更生管に対する漏水を防止することができる上、点検口の更生作業を更生管による既設管の更生作業と同時に行えて作業効率の向上を図ることができる。
【0034】
特に、更生管敷設工程完了後に、3分岐管の上方開口孔の周囲に対し更生管の新点検口をシールするシール工程を備えることで、更生管に対する漏水をより確実に防止することができる。
【図面の簡単な説明】
【図1】本発明の実施形態に係る更生作業前の更生管を示す斜視図である。
【図2】更生管の製造工程を説明するための図である。
【図3】更生管を既設管の内部に引き込む動作を説明するための図である。
【図4】3分岐管を貫通孔方向から見た上方開口孔付近の断面図である。
【図5】3分岐管を上方から視た平面図である。
【図6】3分岐管を側方から見た一部切欠断面図である。
【図7】(a)は埋設本管内に更生管を引き込んだ状態を示す断面図である。
(b)は更生管を加熱して形状回復させた状態を示す断面図である。
(c)は更生管を加圧膨張させて埋設本管の内面に密着させた状態を示す断面図である。
【図8】更生管の拡径動作を説明するための図である。
【図9】3分岐管付近での更生管の拡径状態を示す断面図である。
【図10】3分岐管付近での新点検口の孔開け状態を示す断面図である。
【符号の説明】
1 更生管
12 新点検口
3 既設管
4 3分岐管
41 上方開口孔
42 貫通孔
T 点検口
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inspection port rehabilitation method for rehabilitating an inspection port provided in an existing pipe when lining the inner surface of the existing pipe buried underground with the rehabilitation pipe.
[0002]
[Prior art]
In general, aging existing pipes made of reinforced concrete pipes (fume pipes), steel pipes, etc. are inserted into the inside while sequentially connecting new resin pipes with a small diameter of a predetermined length, and laid rehabilitation pipes. Rehabilitation is performed by injecting a sealing material such as mortar or foamable resin material into the gap between the existing pipe and sealing it.
[0003]
Thus, when rehabilitating using a backfilling material, the inner diameter of the rehabilitation pipe is considerably smaller than the inner diameter of the existing pipe, and therefore there is a problem that the effective flow rate is reduced, Since it is necessary to lay the rehabilitation pipe while sequentially connecting the resin pipes or to inject the backfill material into the gap with the existing pipe and seal it, the workability is poor and the rehabilitation work cannot be performed quickly.
[0004]
From this point, for example, as disclosed in Japanese Patent Laid-Open No. 1-56531, the inner surface of an existing pipe such as a sewage pipe has a shape recovery property in a cylindrical shape at a shape recovery temperature made of a thermoplastic resin. There has been proposed one in which a pipe liner having a cross-sectional shape degenerated in a bowl shape is drawn in and restored to a circular shape by heat expansion so that the inner surface of an existing pipe is lined.
[0005]
[Problems to be solved by the invention]
By the way, since inspection ports such as manholes and masses that open existing pipes to the ground are also aged due to deterioration over the years, there is a demand for rehabilitation of inspection ports.
[0006]
In that case, it is conceivable to renovate by attaching a new manhole or mass to the inside of the inspection port made of a manhole or mass as in the case of rehabilitating the existing pipe with the rehabilitation pipe. However, in order to connect a new manhole or mass to the rehabilitated pipe that has rehabilitated the existing pipe, a joint is required, and there is a risk of water leakage to the rehabilitated pipe.
[0007]
In addition, since the rehabilitation work of the inspection port is performed before and after the rehabilitation work of the existing pipe by the rehabilitation pipe, the work efficiency is remarkably deteriorated.
[0008]
The present invention has been made in view of the above points, and the object of the present invention is to prevent water leakage to the rehabilitation pipe and efficiently rehabilitate the existing pipe and rehabilitate the inspection port at the same time. It is to provide an inspection port rehabilitation method for rehabilitation pipes.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is directed to a case where the inner surface of an existing pipe buried underground is lined with a rehabilitation pipe.
[0010]
Specifically, when the inner surface of an existing pipe buried underground is lined with a rehabilitated pipe, the three-branch pipe installation process and the rehabilitated pipe laying process are used as the inspection port rehabilitation method to rehabilitate the inspection port provided in the existing pipe. And a lining process and a drilling process. In the 3-branch pipe installation process, an inspection port is positioned in the middle of the existing pipe that is lined by the rehabilitation pipe, and an upper opening hole that opens upward and the upper opening hole are provided so as to correspond to the inspection port. A three-branch pipe having through holes penetrating in the direction toward both ends of the existing pipe is installed so as to communicate with both ends of the pipe. In the rehabilitation pipe laying process, the rehabilitation pipe introduced from one end side of the existing pipe is inserted into the through hole of the above-mentioned 3 branch pipe and led to the other end side of the existing pipe, and the rehabilitation pipe is laid in the existing pipe and the 3 branch pipe To do. In the lining process, steam is introduced into the rehabilitation pipe to heat the rehabilitation pipe, and then compressed air is fed into the rehabilitation pipe to pressurize and expand the rehabilitation pipe, so that the rehabilitation pipe is attached to the inner surface of the existing pipe and the 3-branch pipe. Line up closely. In the drilling step, a new inspection port is drilled from above at a position corresponding to the upper opening hole of the three branch pipe in the rehabilitation pipe.
[0011]
With this specific matter, a 3-branch pipe is installed at the inspection port in the middle of the existing pipe, and the rehabilitation pipe is inserted into the through-hole of the 3-branch pipe and laid on the inner surface of the existing pipe and the 3-branch pipe. After the pipes are brought into close contact with each other and lined, a new inspection port is drilled from above at a position corresponding to the upper opening hole of the three-branch pipe in the rehabilitation pipe. This eliminates the need for a joint required when a new manhole or mass is attached to the inside of an inspection port made of a manhole or mass to rehabilitate the inspection port, thereby preventing leakage of water to the rehabilitation pipe. In addition, the rehabilitation work of the inspection port and the rehabilitation work of the existing pipe by the rehabilitation pipe are performed at the same time without any change, and the rehabilitation work of the inspection port can be performed efficiently.
[0012]
In particular, the following configurations are listed as those that can more reliably prevent water leakage to the rehabilitation pipe.
[0013]
That is, after the rehabilitation pipe laying process is completed, a sealing process is provided for sealing the new inspection port of the rehabilitation pipe around the upper opening hole of the three branch pipe.
[0014]
With this specific matter, the new inspection port of the rehabilitation pipe is sealed against the periphery of the upper opening hole of the three-branch pipe, and water leakage to the rehabilitation pipe can be prevented more reliably.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0016]
FIG. 1 shows a rehabilitation pipe used in the inspection port rehabilitation method according to the present invention. The rehabilitation pipe 1 is made of a thermoplastic resin such as vinyl chloride or high-density polyethylene and extends along the longitudinal direction on the outer surface. It is deformed so as to have the recess 11 and is formed into a shape that is degenerated into a bowl shape with a reduced cross-sectional outer area. Further, the rehabilitation pipe 1 has a performance of recovering its shape to a cylindrical body by being heated to a predetermined shape recovery temperature (for example, 80 ° C.). In this case, the shape recovery temperature is a temperature at which the shape is recovered to a cylindrical shape only by heating without applying an external force such as pressure.
[0017]
The manufacturing method of this rehabilitation pipe | tube 1 is as follows. As shown in FIG. 2, first, a cylindrical body 10 of a thermoplastic resin material is extruded by an extruder 21, and the cylindrical body 10 is cooled by passing it through a cooling water tank 22. The outer surface is crushed in an atmosphere of a recovery temperature, and a recess 11 extending along the longitudinal direction is formed on the outer surface as shown in FIG. Thereafter, the cylindrical body 10 is pulled by the tensioning device 24 so that the cross-sectional outer area is reduced, and the cylindrical body 10 is wound on the drum 26 via the traverse portion 25.
[0018]
The rehabilitating pipe 1 manufactured in this way is restrained so that the pipe itself does not “recover naturally” under the influence of the outside air temperature until it is carried into the rehabilitation site of the existing pipe. It is preferable to constrain using or to store at low temperature.
[0019]
-Rehabilitation work-
Next, renovation work for existing pipes and inspection ports will be described.
[0020]
Here, as shown in FIG. 3, the existing pipe 3 buried between the upstream manhole Q1 (manhole located on the left side in FIG. 3) and the downstream manhole Q2 (manhole located on the right side in FIG. 3). The case of rehabilitation will be described. In this case, a single inspection port T is provided in the middle of the existing pipe 3 located between the upstream manhole Q1 and the downstream manhole Q2, and this inspection port T opens the existing pipe 3 to the ground. It is constituted by a mass M.
[0021]
In the rehabilitation work in this embodiment, the rehabilitation work of the existing pipe 3 by the rehabilitation pipe 1 and the renewal work of the inspection port T are performed simultaneously.
[0022]
The rehabilitation pipe 1 wound on the drum 26 is carried on the ground near the upstream manhole Q1. On the other hand, a winch 51 is disposed on the ground near the downstream manhole Q2. In addition, a guide portion 52 for guiding the wire 54 that pulls the rehabilitation pipe 1 is provided at the lower portion of the downstream manhole Q2. Prior to inserting the rehabilitation pipe 1 into the existing pipe 3, the inside of the existing pipe 3 is washed in advance and the protrusions are removed.
[0023]
First, as a three-branch pipe installation step, the three-branch pipe 4 made of a synthetic resin is installed at an intermediate position of the existing pipe 3 lined by the rehabilitation pipe 1. Specifically, the upper opening hole 41 that opens the three-branch pipe 4 is made to correspond to the inspection port T (mass M), and the upper opening hole 41 is connected to both ends of the existing pipe 3 (upstream manhole Q1). It is installed in the recess 31 provided on the lower surface of the existing pipe 3 so as to correspond to the through-holes 42 penetrating toward both ends of the existing pipe 3 so as to communicate with the side and downstream manhole Q2 side. In this case, the three-branch pipe 4 is formed in such a size that the inner diameter of the through hole 42 coincides with the inner diameter of the existing pipe 3, while the inner diameter of the upper opening hole 41 is the through hole 42 as shown in FIG. The through-hole 42 is made to match the existing pipe 3 when installed at the bottom of the existing pipe 3. Further, as shown in FIGS. 5 and 6, around the upper opening hole 41 of the three-branch pipe 4, the new inspection port 12 (described later) of the rehabilitated pipe 1 is sealed around the through hole 42. An annular rubber wheel 45 is provided.
[0024]
Next, as a rehabilitation pipe laying step, as shown in FIG. 3, the tip of the wire 54 led out from the winch 51 is upstream from the lower end of the downstream manhole Q2 through the existing pipe 3 and the communication hole 42 of the three branch pipe 4. Lead to the lower end of the side manhole Q1. Then, the drum 26 is rotated, and the tip of the rehabilitation pipe 1 is led out to the lower end of the upstream manhole Q1, that is, the upstream end of the existing pipe 3. In the upstream manhole Q 1, a tip tool 53 is attached to the tip of the rehabilitation pipe 1, and the tip of the wire 54 extending from the winch 51 is locked to the tip tool 53. Thereafter, with the tip of the rehabilitation pipe 1 fed out from the drum 26 being inserted into the existing pipe 3, the rehabilitation pipe 1 is pulled by winding the wire 54 with the winch 51, and the rehabilitation pipe 1 is removed from the existing pipe 3. Pull inside. By this operation, the rehabilitation pipe 1 is led from the upstream manhole Q1 side to the downstream manhole Q2 side through the through hole 42 of the three branch pipe 4, and the existing manhole Q1 and the downstream manhole Q2 are connected. Lay over the entire length in the tube 3. The arrangement state of the rehabilitated pipe 1 in the existing pipe 3 at this time is shown in FIG.
[0025]
Then, it progresses to a lining process. In this lining process, as shown in FIG. 8, a steam generator / pressurizer 55 is disposed on the ground near the upstream manhole Q1, and a water / steam separator 56 is disposed on the ground near the downstream manhole Q2. . An elbow 57 is connected to the rear end of the rehabilitation pipe 1, and a hose 55 a extending from the steam generator / pressurizer 55 is connected to the elbow 57, and a hose extending from the water / steam separator 56 to the tip 53 of the rehabilitation pipe 1. 56a is connected. A temperature sensor (not shown) is attached to the elbow 57 and the tip tool 53. In this state, steam is continuously supplied from the steam generator / pressurizer 55 into the rehabilitation pipe 1, and the rehabilitation pipe 1 is heated from its inside to the shape recovery temperature while flowing down to the water / steam separator 56. Then, the shape is restored to a substantially original cylindrical body. The state of the renovated pipe 1 in the existing pipe 3 at this time is shown in FIG.
[0026]
After restoring the shape of the rehabilitating pipe 1 to the cylindrical body in this way, the tip 53 is sealed, and compressed air is sent from the steam generator / pressurizer 55 to the inside of the rehabilitating pipe 1 as shown in FIG. In addition, the rehabilitated pipe 1 is pressurized and expanded from the inside thereof and is brought into close contact with the inner surface of the existing pipe 3 and the inner surface of the through hole 42 (the state of the rehabilitated pipe 1 in the existing pipe 3 at this time is shown in FIG. In this pressurized state, cooling and fixing are performed, and the lining operation for the inner surface of the existing pipe 3 is completed. At this time, the rubber ring 45 that wraps around the upper opening hole 41 of the three-branch pipe 4 in the vicinity of the through hole 42 ensures water-tightness around the upper opening hole 41 of the three-branch pipe 4 by the pressure expansion of the rehabilitation pipe 1. A sealing process is performed in which the new inspection port 12 (described later) of the rehabilitated pipe 1 is sealed by being pressed into a state where it can be performed.
[0027]
Then, as shown in FIG. 10, as a drilling process, a new drilling device provided with a processing tool such as an end mill (not shown) at a position corresponding to the upper opening hole 41 of the three-branch pipe 4 in the rehabilitation pipe 1 from above. The inspection port 12 is drilled. In this case, the lower end of a pipe K (indicated by a two-dot chain line in FIG. 10) extending in the vertical direction may be connected to the new inspection port 12 so as to fill the periphery of the pipe K.
[0028]
-Effect of the embodiment-
As described above, in the inspection port rehabilitation method for the rehabilitation pipe 1 in this embodiment, the three-branch pipe 4 is installed in the inspection port T in the middle of the existing pipe 3, and the rehabilitation pipe is placed in the through hole 42 of the three-branch pipe 4. In a state where 1 is inserted and laid, the rehabilitated pipe 1 is closely attached to the inner surfaces of the existing pipe 3 and the 3-branch pipe 4, and then the retinal pipe 1 corresponds to the upper opening hole 41 of the 3-branch pipe 4 If the new inspection port 12 is drilled from above, the renewal operation of the inspection port T is completed. For this reason, the joint required when attaching a new manhole and a mass inside the inspection port which consists of a manhole and a mass and renovating an inspection port becomes unnecessary. In addition, the new inspection port 12 of the rehabilitated pipe 1 is sealed by a rubber ring 45 that goes around the through hole 42 around the upper opening hole 41 of the three branch pipe 4. Thereby, the water leak with respect to the rehabilitation pipe | tube 1 can be prevented reliably.
[0029]
Moreover, the rubber ring 45 attached around the upper opening hole 41 of the three-branch pipe 4 around the through-hole 42 is watertight against the periphery of the upper opening hole 41 of the three-branch pipe 4 by the pressure expansion of the rehabilitation pipe 1. Since it is pressed into a state that can ensure the safety, there is no need to take troublesome work like applying a sealing material and sealing, and the sealing process is performed simultaneously by the pressure expansion of the rehabilitation pipe, simplifying the sealing process Can be achieved.
[0030]
Further, the rehabilitation work of the inspection port T and the rehabilitation work of the existing pipe 3 by the rehabilitation pipe 1 are performed simultaneously without going back and forth, and the rehabilitation work of the inspection port T can be performed efficiently.
[0031]
-Other embodiments-
In addition, this invention is not limited to the said embodiment, The other various modifications are included. For example, in the present embodiment, the sealing process by the rubber ring 45 attached around the upper opening hole 41 of the three branch pipe 4 can be performed simultaneously with the lining process by the pressure expansion of the renovated pipe 1 in the lining process. Immediately after the rehabilitation pipe laying process, a sealing process may be performed in which an adhesive is applied around the upper opening hole of the three-branch pipe, and sealing with the adhesive may be performed by pressurization and expansion of the rehabilitation pipe in the lining process.
[0032]
Further, in the present embodiment, the case where the single inspection port T made of the mass M positioned in the middle position of the existing pipe 3 between the upstream manhole Q1 and the downstream manhole Q2 is renewed has been described. Of course, the present invention can also be applied to the case where a plurality of inspection ports made up of masses and manholes are rehabilitated in the middle of the existing pipe between the manhole and the downstream manhole.
[0033]
【The invention's effect】
As described above, in the present invention, lining with a rehabilitation pipe is performed in a state where a 3-branch pipe is installed at an inspection port in the middle of an existing pipe and the rehabilitation pipe is inserted into the through-hole of the 3-branch pipe. In addition, if a new inspection port is drilled from the upper side at the location corresponding to the upper opening hole of the 3-branch pipe in the rehabilitation pipe, the inspection port can be rehabilitated to prevent leakage to the rehabilitation pipe without providing a joint. In addition, the rehabilitation work of the inspection port can be performed simultaneously with the rehabilitation work of the existing pipe by the rehabilitation pipe, so that the work efficiency can be improved.
[0034]
In particular, after the rehabilitation pipe laying process is completed, it is possible to more reliably prevent water leakage to the rehabilitation pipe by providing a sealing process for sealing the new inspection port of the rehabilitation pipe around the upper opening hole of the three branch pipe.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a rehabilitation pipe before rehabilitation work according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining a manufacturing process of a rehabilitation pipe.
FIG. 3 is a diagram for explaining an operation of drawing a rehabilitation pipe into an existing pipe.
FIG. 4 is a cross-sectional view of the vicinity of the upper opening when the three-branch pipe is viewed from the through hole direction.
FIG. 5 is a plan view of a three-branch pipe as viewed from above.
FIG. 6 is a partially cutaway cross-sectional view of a three-branch pipe as viewed from the side.
FIG. 7A is a cross-sectional view showing a state in which a rehabilitation pipe is drawn into the buried main pipe.
(B) is sectional drawing which shows the state which heated the rehabilitation pipe | tube and was made to recover shape.
(C) is sectional drawing which shows the state which pressure-expanded the rehabilitation pipe | tube, and was made to closely_contact | adhere to the inner surface of an embedding main pipe | tube.
FIG. 8 is a view for explaining the diameter expansion operation of the rehabilitation pipe.
FIG. 9 is a cross-sectional view showing a diameter expansion state of the rehabilitation pipe in the vicinity of the three branch pipe.
FIG. 10 is a cross-sectional view showing a state in which a new inspection port is opened in the vicinity of a three-branch pipe.
[Explanation of symbols]
1 Rehabilitation pipe 12 New inspection port 3 Existing pipe 4 3 branch pipe 41 Upper opening hole 42 Through hole T Inspection port

Claims (2)

  1. 地下に埋設した既設管の内面を更生管によりライニングする際に、上記既設管に設けられた点検口を更生する点検口更生方法であって、
    上記更生管によりライニングされる既設管の途中位置に、点検口を位置付けておくとともに、この点検口に対応するように上方に開口する上方開口孔および該上方開口孔を既設管の両端側に連通させるように既設管の両端側向きに貫通する貫通孔を備えた3分岐管を設置する3分岐管設置工程と、
    既設管の一端側から導入した更生管を上記3分岐管の貫通孔内に挿通させて既設管の他端側に導出させ、既設管内および3分岐管内に更生管を敷設する更生管敷設工程と、
    更生管内に蒸気を導入して更生管を加熱した後、更生管内に圧縮空気を送給して更生管を加圧膨張させることにより既設管および3分岐管の内面に更生管を密着させてライニングするライニング工程と、
    上記更生管における3分岐管の上方開口孔と対応する箇所に上方から新点検口を孔開けする孔開け工程と
    を備えていることを特徴とする更生管の点検口更生方法。
    An inspection port rehabilitation method for rehabilitating the inspection port provided in the existing pipe when lining the inner surface of the existing pipe buried underground with the rehabilitation pipe,
    An inspection port is positioned in the middle of the existing pipe that is lined by the rehabilitation pipe, and the upper opening hole that opens upward and the upper opening hole are communicated with both ends of the existing pipe. A three-branch pipe installation step of installing a three-branch pipe having through holes penetrating toward both ends of the existing pipe so that
    A rehabilitation pipe laying step in which a rehabilitation pipe introduced from one end side of the existing pipe is inserted into the through-hole of the three-branch pipe and led to the other end side of the existing pipe, and the rehabilitation pipe is laid in the existing pipe and the 3-branch pipe; ,
    After introducing steam into the rehabilitation pipe and heating the rehabilitation pipe, supply the compressed air into the rehabilitation pipe and pressurize and expand the rehabilitation pipe to bring the rehabilitation pipe into close contact with the inner surface of the existing pipe and the 3-branch pipe Lining process,
    An inspection port rehabilitation method for a rehabilitation pipe, comprising: a drilling step for drilling a new inspection opening from above at a position corresponding to the upper opening hole of the three branch pipe in the rehabilitation pipe.
  2. 上記請求項1に記載の更生管の点検口更生方法において、
    更生管敷設工程完了後に、3分岐管の上方開口孔の周囲に対し更生管の新点検口をシールするシール工程を備えていることを特徴とする更生管の点検口更生方法。
    In the rehabilitation pipe inspection port rehabilitation method according to claim 1,
    An inspection port rehabilitation method for a rehabilitation pipe, comprising a sealing step of sealing a new inspection opening of the rehabilitation pipe around the upper opening hole of the three branch pipe after completion of the rehabilitation pipe laying process.
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JPS62279924A (en) * 1986-05-29 1987-12-04 Ashimori Ind Co Ltd Method of lining drainpipe having branch part
JPS63167193A (en) * 1986-12-26 1988-07-11 Japan Steel & Tube Constr Method of repairing branch section of pipe
JPH0516236A (en) * 1991-07-09 1993-01-26 Japan Steel & Tube Constr Co Ltd Lining method
JPH0615738A (en) * 1991-10-08 1994-01-25 Ashimori Ind Co Ltd Repairing method for branched section of piping and piping having branch
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