JP6854557B2

JP6854557B2 - Freezing type uninterrupted flow structure and freezing type uninterrupted flow method

Info

Publication number: JP6854557B2
Application number: JP2017034211A
Authority: JP
Inventors: 大介臼倉; 祐輝五十子; 大平横山
Original assignee: Suiken Co Ltd
Current assignee: Suiken Co Ltd
Priority date: 2017-02-25
Filing date: 2017-02-25
Publication date: 2021-04-07
Anticipated expiration: 2037-02-25
Also published as: JP2018141473A

Description

本発明は凍結式の不断流構造及び凍結式の不断流工法に関する。 The present invention relates to a freezing type uninterrupted flow structure and a freezing type uninterrupted flow method.

既設の管路を流れる流体を液体チッソなどにより２ヶ所において凍結し、管路の流れを遮断して、配管要素を交換する工法は公知である（特許文献１）。 A method of freezing the fluid flowing through an existing pipeline at two places with a liquid nitrogen or the like, blocking the flow of the pipeline, and replacing the piping element is known (Patent Document 1).

ＪＰＳ６３−２６４９１（第１図）JPS63-26491 (Fig. 1)

しかし、前記特許文献１の発明では、既設の管路の流れが遮断されるという大きな問題がある。 However, the invention of Patent Document 1 has a big problem that the flow of the existing pipeline is blocked.

したがって、本発明の目的は凍結式の不断流工法により、既設の管路の流体の流れを止めることなく、配管要素を取り外すことである。 Therefore, an object of the present invention is to remove a piping element by a freezing type continuous flow method without stopping the flow of fluid in an existing pipeline.

請求項１に記載の発明は、既設の管路が、本管部と、前記本管部の径方向に突出した枝管部とを有するＴ字状管部を有し、前記枝管部に設置された配管要素を、前記枝管部から取り外す凍結式の不断流構造であって、
前記Ｔ字状管部は、前記本管部と前記枝管部とが一体構造で、
前記本管部と前記枝管部の接続部は、管内側に突出する断面アール形状であり、
前記枝管部は、
突出側にフランジを有し、
前記枝管部の周囲と、前記本管部と前記枝管部の接続部を囲う枠を備え、
前記枠は、
前記本管部に接する部分と、前記枝管部から前記フランジの周囲を囲む部分とを有し、
前記枠内に凍結用の冷媒を充填し、
前記凍結用の冷媒により前記枝管部内および前記枝管部内に臨む前記本管部内の一部の流体を凍結する構成であり、
前記本管部に流体が流れた状態で、前記枝管部内および前記枝管部内に臨む前記本管部内の一部の流体を凍結し、
前記流体が凍結した状態で、前記配管要素を前記フランジを介して取り外し可能な構造である、
ことを特徴とする凍結式の不断流構造である。
請求項２に記載の発明は、既設の管路が、本管部と、前記本管部の径方向に突出した枝管部とを有するＴ字状管部を有し、前記枝管部に設置された配管要素を、前記枝管部から取り外す凍結式の不断流工法であって、
前記Ｔ字状管部は、前記本管部と前記枝管部とが一体構造で、
前記本管部と前記枝管部の接続部は、管内側に突出する断面アール形状であり、
前記枝管部は、
突出側にフランジを有し、
前記枝管部の周囲と、前記本管部と前記枝管部の接続部を囲う枠を備え、
前記枠は、
前記本管部に接する部分と、前記枝管部から前記フランジの周囲を囲む部分とを有し、
前記枠内に凍結用の冷媒を充填し、
前記凍結用の冷媒により前記枝管部内および前記枝管部内に臨む前記本管部内の一部の流体を凍結する構成であり、
前記本管部に流体が流れた状態で、前記枝管部内および前記枝管部内に臨む前記本管部内の一部の流体を凍結する凍結工程と、
前記流体が凍結した状態で、前記配管要素を前記フランジを介して取り外す取外し工程と、
を備える、
ことを特徴とする凍結式の不断流工法である。
請求項３に記載の発明は、前記既設の管路は、前記枝管部のフランジに前記配管要素のフランジが複数組の既存のボルト及びナットで接続された既設の管路であって、
前記凍結工程に先立って、前記既存のボルト及びナットを予め新しいボルト及びナットに交換すると共に、前記新しいナットが前記配管要素のフランジに接するように前記新しいボルト及びナットで前記一対のフランジを締め付ける交換工程を更に備える、
ことを特徴とする請求項２に記載の凍結式の不断流工法である。
請求項４に記載の発明は、前記交換工程において新しいボルトが前記枝管部のフランジを貫通するように前記新しいボルト及びナットで前記一対のフランジを締め付け、
前記新しいボルトが回転するのを防止する回り止め具を前記凍結工程に先立って前記枝管部のフランジに回り止め具を取り付ける回り止め具の取付工程を更に備える、
ことを特徴とする請求項３に記載の凍結式の不断流工法である。
請求項５に記載の発明は、前記枝管部を囲うように枠を組む枠組工程と、
前記枠内に凍結用の冷媒を充填する充填工程と、を更にさらに備え、
前記凍結工程において、前記凍結用の冷媒により前記枝管部内の流体を凍結する、
ことを特徴とする請求項２または請求項３に記載の凍結式の不断流工法である。
請求項６に記載の発明は、前記充填工程に先立って、
前記流体を凍結させる前記枝管部内において管内部に突出する係止具を前記枝管部に固定する係止具取付工程を更に備える、
ことを特徴とする請求項５に記載の凍結式の不断流工法である。 In the invention according to claim 1, the existing pipeline has a T-shaped pipe portion having a main pipe portion and a branch pipe portion protruding in the radial direction of the main pipe portion, and the branch pipe portion has a T-shaped pipe portion. It is a freezing type continuous flow structure in which the installed piping element is removed from the branch pipe portion.
The T-shaped pipe portion has a structure in which the main pipe portion and the branch pipe portion are integrated.
The connecting portion between the main pipe portion and the branch pipe portion has a rounded cross section protruding inward of the pipe.
The branch pipe portion
Has a flange on the protruding side,
A frame is provided around the branch pipe portion and surrounding the connection portion between the main pipe portion and the branch pipe portion.
The frame is
It has a portion in contact with the main pipe portion and a portion surrounding the flange from the branch pipe portion.
The frame is filled with a freezing refrigerant, and the frame is filled with a refrigerant for freezing.
The freezing refrigerant freezes a part of the fluid in the branch pipe portion and the main pipe portion facing the branch pipe portion.
With the fluid flowing through the main pipe, a part of the fluid in the main pipe facing the branch pipe and the branch pipe is frozen.
The structure is such that the piping element can be removed via the flange while the fluid is frozen .
It is a freezing type continuous flow structure characterized by this.
In the invention according to claim 2, the existing pipeline has a T-shaped pipe portion having a main pipe portion and a branch pipe portion protruding in the radial direction of the main pipe portion, and the branch pipe portion has a T-shaped pipe portion. It is a freezing type continuous flow method in which the installed piping element is removed from the branch pipe portion.
The T-shaped pipe portion has a structure in which the main pipe portion and the branch pipe portion are integrated.
The connecting portion between the main pipe portion and the branch pipe portion has a rounded cross section protruding inward of the pipe.
The branch pipe portion
Has a flange on the protruding side,
A frame is provided around the branch pipe portion and surrounding the connection portion between the main pipe portion and the branch pipe portion.
The frame is
It has a portion in contact with the main pipe portion and a portion surrounding the flange from the branch pipe portion.
The frame is filled with a freezing refrigerant, and the frame is filled with a refrigerant for freezing.
The freezing refrigerant freezes a part of the fluid in the branch pipe portion and the main pipe portion facing the branch pipe portion.
A freezing step of freezing a part of the fluid in the main pipe that faces the inside of the branch pipe and the inside of the branch pipe while the fluid is flowing through the main pipe.
In a state in which the fluid is frozen, and outside to remove process takes the pipe elements through the flange,
To prepare
It is a freezing type continuous flow method characterized by this.
According to the third aspect of the present invention, the existing pipeline is an existing pipeline in which the flange of the piping element is connected to the flange of the branch pipe portion by a plurality of sets of existing bolts and nuts.
Prior to the freezing step, the existing bolts and nuts are replaced with new bolts and nuts in advance, and the pair of flanges are tightened with the new bolts and nuts so that the new nuts are in contact with the flanges of the piping elements. Further prepare for the process,
The freezing type continuous flow method according to claim 2, wherein the method is characterized by the above.
The invention according to claim 4 tightens the pair of flanges with the new bolts and nuts so that the new bolts penetrate the flange of the branch pipe portion in the replacement step.
The rotation stopper for preventing the new bolt from rotating is further provided with a rotation stopper attachment step for attaching the rotation stopper to the flange of the branch pipe portion prior to the freezing step.
The freezing type continuous flow method according to claim 3, wherein the method is characterized by the above.
The invention according to claim 5 includes a frame step of assembling a frame so as to surround the branch pipe portion, and a frame process.
Further provided with a filling step of filling the frame with a refrigerant for freezing.
In the freezing step, the fluid in the branch pipe portion is frozen by the freezing refrigerant.
The freezing type continuous flow method according to claim 2 or 3, wherein the method is characterized by the above.
The invention according to claim 6 precedes the filling step.
Further comprising a locking tool attaching step of fixing the locking tool protruding inside the pipe to the branch pipe portion in the branch pipe portion for freezing the fluid.
The freezing type continuous flow method according to claim 5, wherein the method is characterized by the above.

本発明によれば、Ｔ字状管部１の枝管部１１内および／または枝管部１１内に臨む本管部１０内の一部の流体Ｌが凍結される。したがって、枝管部１１に接続された補修弁や仕切弁などを取り外すことができる。 According to the present invention, a part of the fluid L in the main pipe portion 10 facing the branch pipe portion 11 and / or the branch pipe portion 11 of the T-shaped pipe portion 1 is frozen. Therefore, the repair valve, the sluice valve, and the like connected to the branch pipe portion 11 can be removed.

特に、前記凍結工程において、Ｔ字状管部１の本管部１０の流体Ｌが流れた状態を保つので、水などの流体Ｌの流れを止めることなく、前記取り外しを行うことができる。 In particular, in the freezing step, since the fluid L of the main portion 10 of the T-shaped pipe portion 1 is kept flowing, the removal can be performed without stopping the flow of the fluid L such as water.

本発明の実施例１の工法の工程の一部を示す断面図である。It is sectional drawing which shows a part of the process of the construction method of Example 1 of this invention. 本発明の実施例１の工法の工程の一部を示す断面図である。It is sectional drawing which shows a part of the process of the construction method of Example 1 of this invention. 本発明の実施例１の工法の工程の一部を示す断面図である。It is sectional drawing which shows a part of the process of the construction method of Example 1 of this invention. 本発明の実施例１の工法の工程の一部を示す断面図である。It is sectional drawing which shows a part of the process of the construction method of Example 1 of this invention. 本発明の実施例２の工法の工程の一部を示す断面図である。It is sectional drawing which shows a part of the process of the construction method of Example 2 of this invention. 本発明の実施例２の工法の工程の一部を示す断面図である。It is sectional drawing which shows a part of the process of the construction method of Example 2 of this invention.

各図において、実行した工程を分かり易くするために、工程の実行により変化した部位には、ドット模様を付している。また、実行した工程を分かり易くするために、管路の各部の断面にはハッチングを施していない。 In each figure, in order to make the executed process easy to understand, a dot pattern is attached to the part changed by the execution of the process. Further, in order to make the executed process easy to understand, the cross section of each part of the pipeline is not hatched.

好ましくは、前記既設の管路は、前記枝管部１１のフランジ１１Ｆに前記配管要素１２のフランジ１２Ｆが複数組の既存のボルトＢ１及びナットＮ１で接続された既設の管路であって、
前記凍結工程に先立って、前記既存のボルトＢ１及びナットＮ１を予め新しいボルトＢ２及びナットＮ２に交換すると共に、前記新しいナットＮ２が前記配管要素１２のフランジ１２Ｆに接するように前記新しいボルトＢ２及びナットＮ２で前記一対のフランジ１１Ｆ，１２Ｆを締め付ける交換工程を更に備える。 Preferably, the existing pipeline is an existing pipeline in which the flange 12F of the piping element 12 is connected to the flange 11F of the branch pipe portion 11 by a plurality of sets of existing bolts B1 and nuts N1.
Prior to the freezing step, the existing bolt B1 and nut N1 are replaced with new bolts B2 and nut N2 in advance, and the new bolt B2 and nut are brought into contact with the flange 12F of the piping element 12. A replacement step of tightening the pair of flanges 11F and 12F with N2 is further provided.

既存のボルト及びナットはサビや焼付きなどにより容易に回らない場合がある。これに対し、予め、ボルト及びナットを新しいものと交換しておくことで、こうした不具合に対処し易い。 Existing bolts and nuts may not turn easily due to rust or seizure. On the other hand, by replacing the bolts and nuts with new ones in advance, it is easy to deal with such a problem.

更に好ましくは、前記交換工程において新しいボルトＢ２が前記枝管部１１のフランジ１１Ｆを貫通するように前記新しいボルトＢ２及びナットＮ２で前記一対のフランジ１１Ｆ，１２Ｆを締め付け、
前記新しいボルトＢ２が回転するのを防止する回り止め具２を前記凍結工程に先立って前記枝管部１１のフランジ１１Ｆに回り止め具２を取り付ける取付工程を更に備える。 More preferably, in the replacement step, the pair of flanges 11F and 12F are tightened with the new bolt B2 and the nut N2 so that the new bolt B2 penetrates the flange 11F of the branch pipe portion 11.
A rotation stopper 2 for preventing the new bolt B2 from rotating is further provided with an attachment step of attaching the rotation stopper 2 to the flange 11F of the branch pipe portion 11 prior to the freezing step.

このように、回り止め具２により新しいボルトが回転するのを防止することで、ボルトが供回りすることなく、新しいナットを容易に回転させることができる。 In this way, by preventing the new bolt from rotating by the detent tool 2, the new nut can be easily rotated without the bolt rotating.

好ましくは、前記凍結工程に先立って、
前記枝管部１１を囲うように枠３を組む枠組工程と、
前記枠内に凍結用の冷媒４を充填する充填工程とを更にさらに備え、
前記凍結工程において、前記凍結用の冷媒により前記枝管部１１内の流体Ｌを凍結することを特徴とする。 Preferably, prior to the freezing step,
A frame process of assembling the frame 3 so as to surround the branch pipe portion 11 and
Further, a filling step of filling the frame with the refrigerating refrigerant 4 is provided.
In the freezing step, the fluid L in the branch pipe portion 11 is frozen by the freezing refrigerant.

この場合、枝管部１１に接続された補修弁などを取り外し、必要に応じて、交換や修理などを行うことができる。 In this case, the repair valve or the like connected to the branch pipe portion 11 can be removed and replaced or repaired as necessary.

更に好ましくは、前記充填工程に先立って、
前記流体Ｌを凍結させる前記枝管部１１内において管内部に突出する係止具５を前記枝管部１１に固定する係止具取付工程を更に備える。 More preferably, prior to the filling step,
Further provided is a locking tool attaching step of fixing the locking tool 5 projecting inside the pipe in the branch pipe portion 11 that freezes the fluid L to the branch pipe portion 11.

この場合、流体の凍結部位に係止具５が係止しており、凍結部位に滑りが生じにくい。 In this case, the locking tool 5 is locked to the frozen portion of the fluid, and the frozen portion is less likely to slip.

好ましくは、前記凍結工程に先立って、
前記枝管部１１に臨む本管部１０内の部位１３を囲うように枠３を組む枠組工程と、
前記枠３内に凍結用の冷媒４を充填する充填工程とを更にさらに備え、
前記凍結工程において、前記凍結用の冷媒４により前記本管部１０内の前記部位１３を凍結することを特徴とする。 Preferably, prior to the freezing step,
A frame step of assembling the frame 3 so as to surround the portion 13 in the main portion 10 facing the branch pipe portion 11.
Further, a filling step of filling the frame 3 with the refrigerating refrigerant 4 is provided.
In the freezing step, the portion 13 in the main section 10 is frozen by the freezing refrigerant 4.

この場合、枝管部１１内を凍結させずに、あるいは、枝管部１１内の凍結部位を溶かすことで、枝管部１１に接続された仕切弁の弁蓋や弁体を交換することができる。 In this case, the valve lid and valve body of the sluice valve connected to the branch pipe portion 11 can be replaced without freezing the inside of the branch pipe portion 11 or by melting the frozen portion in the branch pipe portion 11. it can.

以下、本発明の実施例を図面にしたがって説明する。図１〜図４は実施例１を示す。 Hereinafter, examples of the present invention will be described with reference to the drawings. 1 to 4 show Example 1.

既設の管路のＴ字状管部１は本管部１０と前記本管部１０の径方向Ｒに突出した枝管部１１とを有する。前記Ｔ字状管部１の前記枝管部１１には配管要素１２が設置されている。本工法は配管要素１２を前記既設の管路から取り外す不断流工法である。 The T-shaped pipe portion 1 of the existing pipeline has a main pipe portion 10 and a branch pipe portion 11 protruding in the radial direction R of the main pipe portion 10. A piping element 12 is installed in the branch pipe portion 11 of the T-shaped pipe portion 1. This construction method is a continuous flow construction method in which the piping element 12 is removed from the existing pipeline.

前記既設の前記枝管部１１のフランジ１１Ｆには前記配管要素１２のフランジ１２Ｆが複数組の既存のボルトＢ１及びナットＮ１で接続されている。本例の場合、配管要素１２は補修弁である。
なお、補修弁は主に消火栓や空気弁の止水用としてＴ字管との間に設置される。 The flange 12F of the piping element 12 is connected to the flange 11F of the existing branch pipe portion 11 by a plurality of sets of existing bolts B1 and nuts N1. In the case of this example, the piping element 12 is a repair valve.
The repair valve is mainly installed between the fire hydrant and the T-shaped pipe for stopping water from the air valve.

本工法は不断流工法であり、本管部１０には流体Ｌが流れたままの状態で、以下の各工程が実行される。 This construction method is a continuous flow construction method, and the following steps are executed with the fluid L flowing through the main section 10.

図１Ａおよび図１Ｂに示す交換工程では、後述の凍結工程に先立って、前記既存のボルトＢ１及びナットＮ１を１組ずつ予め新しいボルトＢ２及びナットＮ２に交換する。この際、新しいナットＮ２が前記配管要素１２のフランジ１２Ｆに接するように前記新しいボルトＢ２及びナットＮ２で前記一対のフランジ１１Ｆ，１２Ｆを締め付ける。
図１Ｂの前記交換工程において新しいボルトＢ２が前記枝管部１１のフランジ１１Ｆを貫通するように前記新しいボルトＢ２及びナットＮ２で前記一対のフランジ１１Ｆ，１２Ｆを締め付ける。 In the replacement step shown in FIGS. 1A and 1B, the existing bolts B1 and nuts N1 are replaced with new bolts B2 and nuts N2 one by one in advance prior to the freezing step described later. At this time, the pair of flanges 11F and 12F are tightened with the new bolt B2 and the nut N2 so that the new nut N2 comes into contact with the flange 12F of the piping element 12.
In the replacement step of FIG. 1B, the pair of flanges 11F and 12F are tightened with the new bolt B2 and the nut N2 so that the new bolt B2 penetrates the flange 11F of the branch pipe portion 11.

また、後述の充填工程に先立って、図１Ｂの係止具取付工程では、前記流体Ｌを凍結させる前記枝管部１１内において管内部に突出する係止具５を前記枝管部１１に固定する。係止具５はシール付きのタッピングビスであってもよい。 Further, prior to the filling step described later, in the locking tool attaching step of FIG. 1B, the locking tool 5 projecting inside the pipe in the branch pipe portion 11 that freezes the fluid L is fixed to the branch pipe portion 11. To do. The locking tool 5 may be a tapping screw with a seal.

図２Ａの回り止め具２の取付工程では、前記新しいボルトＢ２が回転するのを防止する回り止め具２を前記凍結工程に先立って前記枝管部１１のフランジ１１Ｆに取り付ける。 In the mounting step of the rotation stopper 2 of FIG. 2A, the rotation stopper 2 for preventing the new bolt B2 from rotating is attached to the flange 11F of the branch pipe portion 11 prior to the freezing step.

図２Ｂの枠組工程では、枝管部１１を囲うように型枠状の枠３をＴ字状管部１に組み付ける。枠３としては例えば発泡スチロール製であってもよく、また、枠３とＴ字状管部１との隙間を湿式のパテで埋めてもよい。 In the frame process of FIG. 2B, the formwork-shaped frame 3 is assembled to the T-shaped pipe portion 1 so as to surround the branch pipe portion 11. The frame 3 may be made of, for example, Styrofoam, or the gap between the frame 3 and the T-shaped tube portion 1 may be filled with a wet putty.

図３Ａの充填工程においては、前記枠３内に液体チッソのような冷媒４を流し込み、枠３内に凍結用の冷媒４を充填する。本冷媒４により枝管部１１内の流体Ｌが凍結する。 In the filling step of FIG. 3A, a refrigerant 4 such as liquid nitrogen is poured into the frame 3, and the frame 3 is filled with the freezing refrigerant 4. The refrigerant 4 freezes the fluid L in the branch pipe portion 11.

すなわち、前記Ｔ字状管部１の本管部１０に流体Ｌが流れた状態で前記枝管部１１内および前記枝管部１１内に臨む前記本管部１０内の一部の流体Ｌを凍結する凍結工程が実行される。なお、本例の場合、流体Ｌの凍結する部位１３は、少なくとも枝管部１１内の一部であってもよい。 That is, a part of the fluid L in the main pipe portion 10 facing the branch pipe portion 11 and the branch pipe portion 11 in a state where the fluid L flows through the main portion 10 of the T-shaped pipe portion 1. A freezing step of freezing is performed. In the case of this example, the frozen portion 13 of the fluid L may be at least a part of the branch pipe portion 11.

前記凍結状態で、図３Ａおよび図３Ｂに示すように新しいナットＮ２を締め、古い配管要素１２を取り外す。 In the frozen state, tighten the new nut N2 as shown in FIGS. 3A and 3B and remove the old piping element 12.

前記取り外し後、図３Ｂの古い配管要素１２に代えて図４Ａの新しい配管要素１２Ｎを設置する。なお、配管要素を交換する代わりに配管要素を現場で修理して管路に再設置することも可能である。 After the removal, the new piping element 12N of FIG. 4A is installed in place of the old piping element 12 of FIG. 3B. Instead of replacing the piping element, it is also possible to repair the piping element on site and re-install it in the pipeline.

その後、前記枠３および回り止め具２を撤去し、係止具５の周囲に保護バンド６を取り付ける。 After that, the frame 3 and the anti-rotation tool 2 are removed, and a protective band 6 is attached around the locking tool 5.

図５および図６は実施例２の概略を示す。本実施例２については、前記図１〜図４の例と異なる箇所について主に説明する。 5 and 6 show an outline of Example 2. The second embodiment will be mainly described with respect to the parts different from the examples of FIGS. 1 to 4.

図５は例えば水道用の管路に設置された仕切弁を示す。以下に説明するように、本凍結式の不断流工法では前記仕切弁の弁体１２Ｖを交換することも可能である。 FIG. 5 shows, for example, a sluice valve installed in a water pipeline. As will be described below, it is also possible to replace the valve body 12V of the sluice valve in this freezing type uninterrupted flow method.

本例において、仕切弁の弁箱はＴ字状管部１を構成する。
また、管路に挿入されている両フランジの部位は本管部１０を構成する。枝管部１１に相当する部位には弁体１２Ｖの一部が収容されている。前記弁体１２Ｖの上部は弁蓋１２Ｃ内に収容されている。前記弁体１２Ｖや弁蓋１２Ｃは、交換される配管要素１２の一部である。 In this example, the valve box of the sluice valve constitutes the T-shaped pipe portion 1.
Further, the portions of both flanges inserted into the pipeline form the main pipe portion 10. A part of the valve body 12V is housed in the portion corresponding to the branch pipe portion 11. The upper part of the valve body 12V is housed in the valve lid 12C. The valve body 12V and the valve lid 12C are a part of the piping element 12 to be replaced.

本例の場合、前記枠組工程において、少なくとも前記枝管部１１に臨む本管部１０内の部位１３を囲うように枠３を組む必要があり、図５Ａの二点鎖線で示すように、前記本管部１０内の部位および枝管部１１の一部を囲うように枠３を組んでもよい。 In the case of this example, in the frame step, it is necessary to assemble the frame 3 so as to surround at least the portion 13 in the main portion 10 facing the branch pipe portion 11, and as shown by the alternate long and short dash line in FIG. The frame 3 may be assembled so as to surround a portion in the main pipe portion 10 and a part of the branch pipe portion 11.

本例の場合、係止具５は本管部１０に固定され、本管部１０内に向かって突出する。したがって、冷媒４により凍結した部位１３は係止具５に流体Ｌの流れ方向に係止する。 In the case of this example, the locking tool 5 is fixed to the main section 10 and projects toward the inside of the main section 10. Therefore, the portion 13 frozen by the refrigerant 4 is locked to the locking tool 5 in the flow direction of the fluid L.

前記凍結工程において、前記凍結用の冷媒４により前記本管部１０内の一部の前記部位１３および枝管部１１内の流体Ｌが凍結される。 In the freezing step, the freezing refrigerant 4 freezes a part of the portion 13 in the main portion 10 and the fluid L in the branch pipe portion 11.

前記凍結後、図５の弁蓋１２Ｃを図６に示すように取り外す。その後、上方の開口から温水Ｈを流し込み、弁体１２Ｖのまわりの凍結した氷を解凍して、弁体１２Ｖを撤去する。 After the freezing, the valve lid 12C of FIG. 5 is removed as shown in FIG. After that, warm water H is poured from the upper opening to thaw the frozen ice around the valve body 12V, and the valve body 12V is removed.

前記撤去後、枝管部１１のフランジ１１Ｆに新しい弁体付きの弁蓋を取り付け、仕切弁の補修が完了する。 After the removal, a valve lid with a new valve body is attached to the flange 11F of the branch pipe portion 11, and the repair of the sluice valve is completed.

本例においては、枝管部１１に臨む本管部１０内の部位のみが凍結するように、冷媒４を枠３内に流し込んでもよい。また、予め、枝管部１１内に連通する循環路を不断流で設け、常時、枝管部１１内に温水を循環させてもよい。 In this example, the refrigerant 4 may be poured into the frame 3 so that only the portion in the main pipe portion 10 facing the branch pipe portion 11 is frozen. Further, a circulation path communicating with the branch pipe portion 11 may be provided in advance without interruption, and hot water may be constantly circulated in the branch pipe portion 11.

本発明の構造及び工法は水道用の管路の他に、原油などの管路に採用することができる。

The structure and construction method of the present invention can be adopted for pipelines of crude oil and the like in addition to pipelines for water supply.

１：Ｔ字状管部１０：本管部１１：枝管部１２：配管要素１３：部位
１１Ｆ，１２Ｆ：フランジ
２：回り止め具３：枠４：冷媒５：係止具６：保護バンド
Ｂ１：既存のボルトＢ２：新しいボルト
Ｎ１：既存のナットＮ２：新しいナット
Ｌ：流体Ｒ：径方向Ｈ：温水 1: T-shaped pipe part 10: Main part 11: Branch pipe part 12: Piping element 13: Part 11F, 12F: Flange 2: Anti-rotation tool 3: Frame 4: Fluid 5: Locking tool 6: Protective band B1 : Existing bolt B2: New bolt N1: Existing nut N2: New nut L: Fluid R: Radial direction H: Hot water

Claims

The existing pipeline has a T-shaped pipe portion having a main pipe portion and a branch pipe portion protruding in the radial direction of the main pipe portion, and a piping element installed in the branch pipe portion is provided with the branch. It is a freezing type continuous flow structure that can be removed from the pipe.
The T-shaped pipe portion has a structure in which the main pipe portion and the branch pipe portion are integrated.
The connecting portion between the main pipe portion and the branch pipe portion has a rounded cross section protruding inward of the pipe.
The branch pipe portion
Has a flange on the protruding side,
A frame is provided around the branch pipe portion and surrounding the connection portion between the main pipe portion and the branch pipe portion.
The frame is
It has a portion in contact with the main pipe portion and a portion surrounding the flange from the branch pipe portion.
The frame is filled with a freezing refrigerant, and the frame is filled with a refrigerant for freezing.
The freezing refrigerant freezes a part of the fluid in the branch pipe portion and the main pipe portion facing the branch pipe portion.
With the fluid flowing through the main pipe, a part of the fluid in the main pipe facing the branch pipe and the branch pipe is frozen.
The structure is such that the piping element can be removed via the flange while the fluid is frozen .
A freezing type continuous flow structure characterized by this.

The existing pipeline has a T-shaped pipe portion having a main pipe portion and a branch pipe portion protruding in the radial direction of the main pipe portion, and a piping element installed in the branch pipe portion is provided with the branch. It is a freezing type continuous flow method that is removed from the pipe part.
The T-shaped pipe portion has a structure in which the main pipe portion and the branch pipe portion are integrated.
The connecting portion between the main pipe portion and the branch pipe portion has a rounded cross section protruding inward of the pipe.
The branch pipe portion
Has a flange on the protruding side,
A frame is provided around the branch pipe portion and surrounding the connection portion between the main pipe portion and the branch pipe portion.
The frame is
It has a portion in contact with the main pipe portion and a portion surrounding the flange from the branch pipe portion.
The frame is filled with a freezing refrigerant, and the frame is filled with a refrigerant for freezing.
The freezing refrigerant freezes a part of the fluid in the branch pipe portion and the main pipe portion facing the branch pipe portion.
A freezing step of freezing a part of the fluid in the main pipe that faces the inside of the branch pipe and the inside of the branch pipe while the fluid is flowing through the main pipe.
In a state in which the fluid is frozen, and outside to remove process takes the pipe elements through the flange,
To prepare
A freezing type continuous flow method characterized by this.

The existing pipeline is an existing pipeline in which the flanges of the piping elements are connected to the flanges of the branch pipe portions with a plurality of sets of existing bolts and nuts.
Prior to the freezing step, the existing bolts and nuts are replaced with new bolts and nuts in advance, and the pair of flanges are tightened with the new bolts and nuts so that the new nuts are in contact with the flanges of the piping elements. Further prepare for the process,
The freezing type continuous flow method according to claim 2, wherein the method is characterized by the above.

In the replacement step, the pair of flanges are tightened with the new bolts and nuts so that the new bolts penetrate the flange of the branch pipe portion.
The rotation stopper for preventing the new bolt from rotating is further provided with a rotation stopper attachment step for attaching the rotation stopper to the flange of the branch pipe portion prior to the freezing step.
The freezing type continuous flow method according to claim 3, wherein the method is characterized by the above.

A frame process in which a frame is assembled so as to surround the branch pipe portion, and
Further provided with a filling step of filling the frame with a refrigerant for freezing.
In the freezing step, the fluid in the branch pipe portion is frozen by the freezing refrigerant.
The freezing type continuous flow method according to claim 2 or 3, wherein the method is characterized by the above.

Prior to the filling step,
Further comprising a locking tool attaching step of fixing the locking tool protruding inside the pipe to the branch pipe portion in the branch pipe portion for freezing the fluid.
The freezing type continuous flow method according to claim 5, wherein the method is characterized by the above.