JP3929111B2 - Insertion pressure maintenance device in pipe regeneration method - Google Patents

Insertion pressure maintenance device in pipe regeneration method Download PDF

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Publication number
JP3929111B2
JP3929111B2 JP14725597A JP14725597A JP3929111B2 JP 3929111 B2 JP3929111 B2 JP 3929111B2 JP 14725597 A JP14725597 A JP 14725597A JP 14725597 A JP14725597 A JP 14725597A JP 3929111 B2 JP3929111 B2 JP 3929111B2
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Prior art keywords
pipe
pressure
new pipe
water
new
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JP14725597A
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JPH10318433A (en
Inventor
久 三浦
孝佳 奥貫
浩昭 金
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Taisei Corp
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Taisei Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00Laying or reclaiming pipes; Repairing or joining pipes on or under water

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipeline Systems (AREA)
  • Examining Or Testing Airtightness (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、パイプ再生工法における挿入圧維持装置に関するものである。
【0002】
【従来の技術】
腐蝕の進んだ海底管などの修理方法として、老朽管の内部に新設管を挿入して再生する方法が開発されている。
これは先端を閉塞した新設管を使用し、新設管の尾端にはプラグを取り付けて、新設管の内部に水を封入し、封入水を尾端から加圧して老朽管の内部に挿入する方法である。
【0003】
【本発明が解決しようとする課題】
そのような方法は、尾端から加圧する方法であるにもかかわらず、新設管の先端には引っ張り力が作用するために座屈を発生しない。そのために長距離の老朽管の再生が可能であるという特徴を備えている。
しかし新設管の尾端をプラグで閉塞しておいて封入水を高圧で加圧する方法であるために、封入水がプラグの周囲から漏出してしまう可能性を避けることができない。
【0004】
本発明は上記したような従来の問題を解決するためになされたもので、新設管の内部の封入水を高圧で加圧してプラグからの漏水が発生しても、新設管の内部の封入水の圧力を一定に維持することができる、パイプ再生工法における挿入圧維持装置を提供することを目的とする。
【0005】
【課題を解決するための手段】
上記のような目的を達成するために、本発明のパイプ再生工法における挿入圧維持装置は、老朽管の内部に、先端を閉塞した新設管を挿入し、新設管の尾端にはプラグを取り付けて新設管の内部に水を封入し、この封入水を尾端から加圧して老朽管の内部に挿入する装置であって、封入水をタンクからくみ上げるポンプと、逆止弁と、流量調整弁と、タンクへのリターンパイプとによって循環回路を形成し、循環回路における、逆止弁と流量調整弁との間から封入水供給パイプを分岐させ、この封入水供給パイプは、新設管の尾端のプラグへ接続して新設管の内部へ封入水を供給するように構成し、封入水供給パイプにはパイプ内部の圧力を検知する圧力発信器を取り付け、圧力発信器からの信号を制御装置を介して、循環回路の流量調整弁に入力して、前記新設管内部の封入水の圧力を一定に保持するように構成した、パイプ再生工法における挿入圧維持装置を特徴としたものである。
【0006】
【本発明の実施の態様】
以下図面を参照しながら本発明のパイプ再生工法における挿入圧維持装置の実施例について説明する。
【0007】
<イ>新設管の挿入の原理。
まず、本発明の基本となる老朽管p1への新設管の挿入方法を説明する。
この方法では前記したように、先端を閉塞した新設管p2を使用する。この新設管p2の尾端にはプラグ7を取り付けて新設管p2の内部に水を封入し、この封入水を尾端から加圧する。
この加圧力によって新設管p2を老朽管p1の内部に挿入する方法である。
【0008】
<ロ>循環回路。
封入水はタンク1に貯蔵してあるので、このタンク1から封入水を汲み上げるポンプ2と、逆止弁3と、流量調整弁4と、タンク1へのリターンパイプ6とを順に組み合わせることによって循環回路を形成する。
したがってタンク1内の封入水は、ポンプ2の運転によって吸引され、逆止弁3、流量調整弁4を通って、タンク1に戻ることになる。
【0009】
<ハ>封入水供給パイプ。
循環回路において、逆止弁3と、流量調整弁4との間から封入水供給パイプ5を分岐させる。 そしてこの封入水供給パイプ5は、新設管p2の尾端のプラグ7へ接続する。
したがってタンク1内部の封入水は封入水供給パイプ5を通って、新設管p2の内部に供給される。
その結果、供給パイプ5の内部の圧力は、新設管p2の内部の圧力と同一となる。
【0010】
<ニ>切り替え機構。
タンク1内部の封入水が吸引され、循環回路を通って、再びタンク1に戻るか、あるいは封入水供給パイプ5から分岐して新設管p2の内部に供給されるかは、切り替え機構によって行う。
そのために、封入水供給パイプ5にはパイプ5内部の圧力を検知する圧力発信器8を取り付る。供給パイプ5の内部の圧力は新設管p2の内部の圧力と同一であるから、この圧力発信器8で表示する圧力は、すなわち新設管p2の内部の封入水の示す圧力である。
この圧力発信器8からの信号を制御装置9に入力する。制御装置9ではパイプ5内の圧力と、設定しておいた圧力との比較を行う。
圧力発信器8で検知した圧力が、一定の値よりも低下したら、制御装置9からは循環回路の流量調整弁4に信号を出力する。
調整弁4はこの信号を受けて弁を一定量だけ開閉する機能を備えている。
【0011】
<ホ>正常時の作動。
新設管p2の内部に封入した封入水の圧力に低下しなければ、新設管p2内部の封入水の圧力と、ポンプ2の加圧力がバランスしている。したがって、封入水供給パイプ5から先には封入水は浸入できない。
一方、流量調整弁4は解放状態であるから、タンク1内から吸引された封入水は封入水供給パイプ5側には分岐せず、流量調整弁4を通過して、再び解放状態のタンク1に戻される。
【0012】
<ヘ>圧力低下時の作動。
圧力発信器8で検知した圧力が低下したら、新設管p2内の封入水がプラグ7の周囲から漏水していることになる。
そのように圧力発信器8で検知した圧力が低下したら、制御装置9からは循環回路の流量調整弁4に信号を出力する。
調整弁4はこの信号を受けて弁を一定量だけ閉じる。すると循環回路の内部の圧力よりも、分岐した供給パイプ5の圧力が低くなる。
そのために循環回路を循環している封入水の一部が、供給パイプ5の側に分岐して流入し、プラグ7を通過して新設管p2の内部に加圧状態で注入される。
このようにプラグ7部分から漏水があった場合に、その状態を自動的に検知して低下分を補充することができ、安定した作業を継続することができる。
【0013】
【本発明の効果】
本発明のパイプ再生工法における挿入圧維持装置は以上説明したようになるから、老朽管p1に新設管p2を挿入する際に、プラグ7の周囲から漏水が発生しても、漏水した分だけ自動的に給水して新設管p2の内部の水圧を一定に保つことができる。
したがって新設管p2の挿入作業を中断することなく、信頼性の高い、確実な新設管の挿入作業を行うことができる。
【図面の簡単な説明】
【図1】パイプ再生工法の機構の説明図
【図2】新設管の挿入圧維持装置の実施例の説明図
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insertion pressure maintaining device in a pipe recycling method.
[0002]
[Prior art]
As a method of repairing corroded submarine pipes, a method has been developed in which a new pipe is inserted into an old pipe and then regenerated.
This uses a new pipe with a closed end, a plug is attached to the tail end of the new pipe, water is sealed inside the new pipe, and the sealed water is pressurized from the tail end and inserted into the old pipe. Is the method.
[0003]
[Problems to be solved by the present invention]
Such a method is a method of applying pressure from the tail end, but does not buckle because a pulling force acts on the tip of the new pipe. Therefore, it has the feature that long-distance old pipes can be regenerated.
However, since the tail end of the new pipe is closed with a plug and the sealed water is pressurized at a high pressure, the possibility of the sealed water leaking from the periphery of the plug cannot be avoided.
[0004]
The present invention has been made to solve the above-described conventional problems. Even if water leaks from the plug by pressurizing the sealed water inside the new pipe at a high pressure, the sealed water inside the new pipe An object of the present invention is to provide an insertion pressure maintaining device in a pipe regeneration method capable of maintaining a constant pressure.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the insertion pressure maintaining device in the pipe regeneration method of the present invention inserts a new pipe with a closed end into an old pipe, and attaches a plug to the tail end of the new pipe. This is a device that fills the inside of the new pipe, pressurizes the sealed water from the tail end, and inserts it into the old pipe. The pump pumps the filled water from the tank, the check valve, and the flow control valve. And a return pipe to the tank, a circulation circuit is formed, and the enclosed water supply pipe is branched from between the check valve and the flow rate adjusting valve in the circulation circuit, and this enclosed water supply pipe is connected to the tail end of the newly installed pipe. It is configured to supply the sealed water to the inside of the new pipe by connecting to the plug of the new pipe, and a pressure transmitter that detects the pressure inside the pipe is attached to the sealed water supply pipe, and the control device receives the signal from the pressure transmitter. Through the flow control valve of the circulation circuit Type and configured to hold the pressure of the enclosed water of the new pipe section to be constant, it is obtained by said insertion pressure maintenance device in the pipe reproducing method.
[0006]
[Embodiments of the present invention]
Embodiments of the insertion pressure maintaining device in the pipe regeneration method of the present invention will be described below with reference to the drawings.
[0007]
<I> Principle of inserting a new pipe.
First, a method for inserting a new pipe into the old pipe p1 which is the basis of the present invention will be described.
In this method, as described above, the new pipe p2 whose tip is closed is used. A plug 7 is attached to the tail end of the new pipe p2, water is sealed inside the new pipe p2, and the sealed water is pressurized from the tail end.
This is a method of inserting the new pipe p2 into the old pipe p1 by this applied pressure.
[0008]
<B> Circulation circuit.
Since the enclosed water is stored in the tank 1, it is circulated by sequentially combining the pump 2 that pumps the enclosed water from the tank 1, the check valve 3, the flow rate adjusting valve 4, and the return pipe 6 to the tank 1. Form a circuit.
Accordingly, the sealed water in the tank 1 is sucked by the operation of the pump 2 and returns to the tank 1 through the check valve 3 and the flow rate adjustment valve 4.
[0009]
<C> Filled water supply pipe.
In the circulation circuit, the sealed water supply pipe 5 is branched from between the check valve 3 and the flow rate adjusting valve 4. The sealed water supply pipe 5 is connected to the plug 7 at the tail end of the new pipe p2.
Therefore, the sealed water in the tank 1 is supplied to the inside of the new pipe p2 through the sealed water supply pipe 5.
As a result, the pressure inside the supply pipe 5 becomes the same as the pressure inside the new pipe p2.
[0010]
<D> Switching mechanism.
Whether the sealed water in the tank 1 is sucked and returns to the tank 1 again through the circulation circuit or is branched from the sealed water supply pipe 5 and supplied to the inside of the new pipe p2 is determined by a switching mechanism.
For this purpose, a pressure transmitter 8 for detecting the pressure inside the pipe 5 is attached to the sealed water supply pipe 5. Since the pressure inside the supply pipe 5 is the same as the pressure inside the new pipe p2, the pressure displayed by the pressure transmitter 8 is the pressure indicated by the enclosed water inside the new pipe p2.
A signal from the pressure transmitter 8 is input to the control device 9. The control device 9 compares the pressure in the pipe 5 with the set pressure.
When the pressure detected by the pressure transmitter 8 falls below a certain value, the control device 9 outputs a signal to the flow rate adjustment valve 4 of the circulation circuit.
The regulating valve 4 has a function of opening and closing the valve by a certain amount in response to this signal.
[0011]
<E> Normal operation.
If the pressure of the sealed water sealed inside the new pipe p2 does not drop, the pressure of the sealed water inside the new pipe p2 and the pressure of the pump 2 are balanced. Therefore, the sealed water cannot enter from the sealed water supply pipe 5 first.
On the other hand, since the flow rate adjustment valve 4 is in the released state, the filled water sucked from the tank 1 does not branch to the filled water supply pipe 5 side, passes through the flow rate adjustment valve 4, and is again in the released state of the tank 1. Returned to
[0012]
<F> Operation when pressure drops.
When the pressure detected by the pressure transmitter 8 decreases, the sealed water in the new pipe p2 leaks from the periphery of the plug 7.
When the pressure detected by the pressure transmitter 8 decreases in this way, the control device 9 outputs a signal to the flow rate adjustment valve 4 of the circulation circuit.
The regulating valve 4 receives this signal and closes the valve by a certain amount. Then, the pressure of the branched supply pipe 5 becomes lower than the pressure inside the circulation circuit.
For this purpose, a part of the sealed water circulating in the circulation circuit branches into the supply pipe 5 and flows in, passes through the plug 7 and is injected into the new pipe p2 in a pressurized state.
Thus, when there is water leakage from the plug 7 portion, the state can be automatically detected to compensate for the decrease, and stable work can be continued.
[0013]
[Effect of the present invention]
Since the insertion pressure maintaining device in the pipe regeneration method of the present invention is as described above, even when water leaks from the periphery of the plug 7 when the new pipe p2 is inserted into the old pipe p1, only the amount of water leaked is automatically Thus, the water pressure inside the new pipe p2 can be kept constant by supplying water.
Therefore, reliable and reliable insertion of the new pipe can be performed without interrupting the insertion of the new pipe p2.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a mechanism of a pipe regeneration method. FIG. 2 is an explanatory view of an embodiment of a new pipe insertion pressure maintaining device.

Claims (1)

老朽管の内部に、先端を閉塞した新設管を挿入し、
新設管の尾端にはプラグを取り付けて新設管の内部に水を封入し、
この封入水を尾端から加圧して老朽管の内部に挿入する装置であって、
封入水をタンクからくみ上げるポンプと、逆止弁と、流量調整弁と、タンクへのリターンパイプとによって循環回路を形成し、
循環回路における、逆止弁と流量調整弁との間から封入水供給パイプを分岐させ、
この封入水供給パイプは、新設管の尾端のプラグへ接続して新設管の内部へ封入水を供給するように構成し、
封入水供給パイプにはパイプ内部の圧力を検知する圧力発信器を取り付け、
圧力発信器からの信号を制御装置を介して、循環回路の流量調整弁に入力して、前記新設管内部の封入水の圧力を一定に保持するように構成した、
パイプ再生工法における挿入圧維持装置。
Insert the new pipe with the closed end inside the old pipe,
A plug is attached to the tail end of the new pipe, and water is sealed inside the new pipe.
It is a device that pressurizes this sealed water from the tail end and inserts it into the old pipe,
A circulation circuit is formed by a pump that pumps the sealed water from the tank, a check valve, a flow rate adjustment valve, and a return pipe to the tank.
In the circulation circuit, branch the enclosed water supply pipe from between the check valve and the flow rate adjustment valve,
This enclosed water supply pipe is configured to connect to the plug at the tail end of the new pipe and supply the enclosed water to the inside of the new pipe.
A pressure transmitter that detects the pressure inside the pipe is attached to the enclosed water supply pipe,
A signal from the pressure transmitter is input to the flow rate adjustment valve of the circulation circuit via the control device, and the pressure of the sealed water inside the new pipe is held constant .
Insertion pressure maintenance device in pipe regeneration method.
JP14725597A 1997-05-21 1997-05-21 Insertion pressure maintenance device in pipe regeneration method Expired - Lifetime JP3929111B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14725597A JP3929111B2 (en) 1997-05-21 1997-05-21 Insertion pressure maintenance device in pipe regeneration method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14725597A JP3929111B2 (en) 1997-05-21 1997-05-21 Insertion pressure maintenance device in pipe regeneration method

Publications (2)

Publication Number Publication Date
JPH10318433A JPH10318433A (en) 1998-12-04
JP3929111B2 true JP3929111B2 (en) 2007-06-13

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CN108458162A (en) * 2016-11-10 2018-08-28 杨飞 A kind of translation device of municipal pipeline assembling

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