JP2016211698A - Blockage and release method for fluid pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blockage and release method for a fluid pipe in which a blockage member shutting-off a fluid pipe is removed to enable fluid to be flowed again.SOLUTION: At first, a blockage member installed at an upstream side pipe end PE1 within a case 10 enclosing a pair of pipe ends PE1, PE2 formed by ablating a part of a gas pipe P kept under non-cutoff flow state is removed. Then, the blockage member is arranged inside the case connected to an opening part 11 of the case 10 through a gate valve 40, and the gate valve 40 is closed. Subsequently, a lid member 7 is arranged inside a case 30 connected to the gate valve 40 in place of the case. Then, the gate valve 40 is opened and the lid member 7 is installed at the case 10 and the opening part 11 of the case 10 is closed in tight by the lid member 7. Lastly, the gate valve 40 is removed from the case 10.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for removing a blocking member blocking a fluid pipe such as a gas pipe and reflowing a fluid.

  Conventionally, in the construction of refurbishing an existing fluid pipe (for example, a gas pipe) or changing the route, a part of the fluid pipe is cut off in an uninterrupted state, and the opening at the upstream end of the fluid pipe is sealed. May be cut off. For example, Patent Document 1 describes a method of cutting off a fluid pipe in an unsteady flow state by cutting a part of a fluid pipe surrounded by a housing and attaching a blocking member to a pipe end on the upstream side. ing.

  In the construction as described above, it may be necessary to allow the fluid to flow again after completing the required work such as repair of the fluid pipe. In that case, it becomes very important to prevent the fluid from leaking after removing the blocking member removed from the pipe end, but Patent Document 1 does not disclose a technique for that purpose.

  In addition, as described in Patent Document 2, a method of installing a valve device between a pair of pipe ends formed by cutting a part of a fluid pipe is also known. In the case of a pipe, there is no general-purpose valve device applicable to this because there is no rubber or other sealing material due to concerns about future deterioration in airtightness, so a blocking member is attached to the pipe end. Therefore, the above-described construction method that shuts off the fluid pipe tends to be more economical and workable.

JP 2008-101702 A JP 2001-353613 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fluid tube cutoff release method that enables the reflow of fluid by removing the cutoff member blocking the fluid tube. There is.

  The above object can be achieved by the present invention as described below. In other words, the fluid pipe shutoff release method according to the present invention includes a pair of pipe ends in a first case surrounding a pair of pipe ends formed by cutting away a part of a fluid pipe in an uninterrupted flow state. Removing the blocking member attached to the upstream pipe end, and disposing the blocking member inside the second case connected to the opening of the first case via a gate valve, A step of closing the valve, and a step of disposing a lid member in the second case connected to the gate valve or in the third case connected to the gate valve instead of the second case; Opening the gate valve, attaching the lid member to the first case, sealing the opening of the first case with the lid member, and removing the gate valve from the first case. It is to be prepared.

  According to such a method, since the blocking member removed from the pipe end is disposed inside the second case, the opening of the first case surrounding the pair of pipe ends is sealed by the lid member. The fluid pipe can be released and the fluid can be recirculated while preventing the fluid from leaking after being removed. The gate valve removed from the first case is removed together with the second or third case.

  In the step of removing the blocking member, it is preferable that the pressing member provided in the first case is pressed from the outside, thereby pressing the blocking member toward the downstream side. Thereby, compared with the case where the blocking member is pulled from the downstream side, the blocking member can be easily removed from the pipe end.

  In the above, the blocking member has a cap shape having a crown portion covering a pipe end and a brim portion protruding in a bowl shape, and in the step of removing the blocking member, the brim portion of the blocking member is moved by the pressing member. It is preferable to press. In this case, the hat-shaped blocking member can be easily removed using the pressing member.

  Further, in the above, the brim portion is pressed against the flange-shaped member fixed to the outer periphery of the upstream pipe end until the blocking member is removed from the tube end, and in the step of removing the blocking member, It is preferable that the outer peripheral portion of the brim portion that protrudes outward from the member is pressed by the pressing member. According to this method, the blocking member can be pressed to the downstream side by the pressing member while using the hook-shaped member fixed to the outer periphery of the upstream pipe end.

  The gate valve is joined to an outer peripheral portion of a flange formed in the opening of the first case, and the lid member is attached to an inner peripheral portion of the flange when the lid member is attached to the first case. Are preferably joined. According to this method, the lid member can be joined to the flange while the gate valve is joined to the flange of the opening of the first case.

  In the above, until the lid member is joined to the flange, the through-hole formed in the inner peripheral portion of the flange is sealed with a sealing member, and when the lid member is joined to the flange, It is preferable that a joining member is attached to the through hole instead of the sealing member, and the lid member is fixed to the flange by the joining member. According to this method, leakage of fluid in the through hole can be prevented by the sealing member, and the lid member can be fixed to the flange by the joining member attached to the through hole.

Longitudinal sectional view showing the state where the breaker is prepared Longitudinal section showing the state where the breaker is lowered Longitudinal sectional view showing the state where the fluid pipe is shut off Longitudinal sectional view showing a state in which the blocking member is removed Longitudinal section showing the state where the breaker is pulled up A longitudinal sectional view showing a state in which a lid member is prepared Longitudinal sectional view showing a state where the lid member is mounted Sectional view when the periphery of the flange in FIG. 6 (corresponding to part A) is viewed from the side Sectional view when the periphery (corresponding to part B) of the flange in FIG. 7 is viewed from the side Longitudinal sectional view showing the state where the gate valve is removed

  Embodiments of the present invention will be described with reference to the drawings. The present invention relates to a method for releasing the shutoff of a fluid pipe that enables the reflow of fluid by removing the shutoff member that shuts off the fluid pipe. Explained. However, the method for blocking the fluid pipe is not limited to this.

[Blockage of fluid pipe]
A gas pipe P (an example of a fluid pipe) shown in FIG. 1 is partly cut away and separated in the pipe axis direction. In FIG. 1, the cutting machine used for excision of the gas pipe P is removed from the operation shaft 22, and the breaker 5 is connected instead. The gas pipe P is in an uninterrupted state, and a fluid gas flows from the right to the left. The case 10 (corresponding to the first case) surrounds a pair of pipe ends PE1 and PE2 formed by cutting away a part of the gas pipe P in the uninterrupted flow state. In the present embodiment, the case 10 further surrounds the flange-shaped member 6 fixed to the outer periphery of the upstream pipe end PE1 by welding or the like.

  The case 10 has an upper and lower divided structure formed by assembling an upper case piece 10a and a lower case piece 10b. An opening 11 through which the circuit breaker 5 can pass is provided in the upper part of the upper case piece 10a. A case 20 (corresponding to a second case) is connected to the opening 11 of the case 10 via a gate valve 40. The case 20 is a cylindrical member having upper and lower openings, and the upper opening is covered with a cover 21. The operation shaft 22 is inserted into a through hole formed in the cover 21 and the breaker 5 can be moved up and down by operating this.

  The circuit breaker 5 includes a blocking member 50 configured to be attachable to the pipe end PE1 of the gas pipe P from the tube axis direction, and a rod-shaped slide member 53 used to move the blocking member 50 in the tube axis direction. With. In the present embodiment, the blocking member 50 has a cap shape having a crown part 51 covering the pipe end PE1 and a brim part 52 protruding in a hook shape. The brim portion 52 is formed to have a larger diameter than the flange-shaped member 6. The slide members 53 are provided at a plurality of locations in the circumferential direction, and each of them is supported so as to be slidable in the longitudinal direction.

  In order to shut off the gas pipe P from the state of FIG. 1, first, as shown in FIG. 2, the gate valve 40 is opened, the operation shaft 22 is lowered, and the breaker 5 disposed in the case 10 through the opening 11 is installed. It inserts between a pair of pipe ends PE1 and PE2. Subsequently, as shown in FIG. 3, the push rod 12 provided in the case 10 is pressed from the outside, and the blocking member 50 is pressed toward the upstream side via the slide member 53. Thereby, the crown part 51 covers the pipe end PE1, and the brim part 52 presses against the flange-shaped member 6 to close the opening of the pipe end PE1. As a result of mounting the blocking member 50 on the pipe end PE1, the gas pipe P is blocked.

  By shutting off the gas pipe P, it becomes possible to perform necessary work such as refurbishment or route change on the downstream side while maintaining the uninterrupted flow state. And when it is necessary to recirculate gas after finishing a required operation | work, it is necessary to cancel | release interruption | blocking of the gas pipe P. FIG. Hereinafter, an example of the method for releasing the shutoff of the gas pipe P will be described.

[Release shut off of fluid pipe]
First, as shown in FIG. 4, the blocking member 50 attached to the pipe end PE <b> 1 is removed inside the case 10. As described above, the case 10 surrounds the pipe ends PE1 and PE2 of the gas pipe P in an uninterrupted flow state, and the pipe end PE1 is an upstream pipe end of the pair of pipe ends PE1 and PE2. . When the blocking member 50 is removed from the pipe end PE1, the operation shaft 22 is raised, the blocking member 50 is disposed inside the case 20 as shown in FIG. 5, and the gate valve 40 is closed.

  In the present embodiment, in the step of removing the blocking member 50, a pushback bar 13 (corresponding to a pressing member) provided on the case 10 is pressed from the outside, thereby pressing the blocking member 50 toward the downstream side. Thereby, compared with the case where the interruption | blocking member 50 is pulled from the downstream via the push rod 12, for example, the interruption | blocking member 50 can be easily removed from pipe end PE1. The push-back bar 13 is composed of a male screw member screwed into the side wall on the upstream side of the case 10 in an airtight state, and is provided at a plurality of locations in the circumferential direction. The push rod 12 provided on the downstream side wall of the case 10 is also configured in the same manner.

  When the hat-shaped blocking member 50 as described above is used, it is preferable to press the brim portion 52 of the blocking member 50 with the push-back bar 13. In the present embodiment, the brim portion 52 is pressed against the flange-shaped member 6 until the blocking member 50 is removed from the pipe end PE1 (see FIG. 3), and in the step of removing the blocking member 50, the outer peripheral side of the flange-shaped member 6 is removed. The outer peripheral portion of the brim portion 52 that protrudes is pressed by the pushback rod 13 (see FIG. 4). For this reason, the blocking member 50 can be appropriately pressed downstream without causing the pushback bar 13 to interfere with the bowl-shaped member 6.

  In the present embodiment, when the blocking member 50 is attached to the pipe end PE1, the brim portion 52 is pressed against the flange-like member 6 instead of the side wall of the case 10, so that a rib or the like is reinforced on the upstream side wall of the case 10. The need to provide materials is low. Therefore, when the pushback bar 13 is provided on the upstream side wall of the case 10, there are few restrictions on the number and position of the pushback bar 13. This is advantageous in a method of pressing the blocking member 50 downstream by a pressing member such as a pushback bar 13 provided on the side wall of the case 10.

  Next, the circuit breaker 5 is removed together with the case 20, and the lid member 7 is disposed inside the case 30 (corresponding to the third case) connected to the gate valve 40 in place of the case 20, as shown in FIG. . The lid member 7 is connected to an operation shaft 32 inserted through a through hole in the upper part of the case 30, and the lid member 7 can be moved up and down by operating the operation shaft 32. In the present embodiment, the cover 21 is used as the case 30. Moreover, it is not restricted to using the case 30 instead of the case 20, the case 20 is left when the circuit breaker 5 is removed, and the lid member 7 is placed inside the case 20 connected to the gate valve 40. You may arrange.

  Subsequently, as shown in FIG. 7, the gate valve 40 is opened to attach the lid member 7 to the case 10, and the opening 11 of the case 10 is sealed by the lid member 7. In the present embodiment, the gate valve 40 is joined to the outer peripheral portion of the flange 14 formed in the opening 11 of the case 10, and when the lid member 7 is attached to the case 10, the inner periphery of the flange 14 is The lid member 7 is joined to the portion (see FIGS. 8 and 9). Therefore, the lid member 7 can be joined to the flange 14 while the gate valve 40 is joined to the flange 14. However, the present invention is not limited to this, and the lid member 7 may be inserted into the opening 11 to thereby seal the opening 11.

  Further, in the present embodiment, until the lid member 7 is joined to the flange 14, the through hole formed in the inner peripheral portion of the flange 14 is sealed with the sealing member 15 as shown in FIG. When the lid member 7 is joined to the sealing member 15, the joining member 16 is attached to the through-hole instead of the sealing member 15 as shown in FIG. Thereby, the lid member 7 can be fixed to the flange 14 by the joining member 16 without leaking gas from the through hole. The sealing member 15 is formed of a bolt member that can be fitted into the through-hole and can maintain an airtight state, and the joining member 16 is formed of a bolt member whose tip is screwed to the lid member 7.

  When attaching the lid member 7 to the case 10, the operating shaft 32 is connected to the case 10 (upper case piece 10 a) by a connecting tool such as a lever block (registered trademark), and the reaction force due to the internal pressure of the case 10 is received. Is preferred. Further, if the rod 71 as drawn with a broken line in FIG. 6 is provided, the lid member 7 can be smoothly moved by pushing the rod 71 protruding from the case 30 from the outside even when the internal pressure of the case 10 is high. Can be pushed down.

  Finally, the case 30 is removed together with the operation shaft 32 that has been disconnected from the lid member 7, and the gate valve 40 is removed from the case 10 as shown in FIG. If necessary, the lid member 7 is integrated with the case 10 (upper case piece 10a) by welding or the like. With this method, the gas pipe P can be released and the gas can be recirculated while removing the blocking member 50 and preventing gas leakage.

  In this embodiment, the example which cancels | releases interruption | blocking of the fluid pipe | tube provided to the gas pipe | tube was shown, However, It is not restricted to this, The fluid pipe | tube for making liquids, such as water flow, may be sufficient. Moreover, although a steel pipe is preferably used as a fluid pipe, it is not limited to this.

  The present invention is not limited to the embodiment described above, and various improvements and modifications can be made without departing from the spirit of the present invention.

6 bowl-shaped member 7 lid member 10 case (first case)
11 Opening portion 12 Pushing rod 13 Pushing rod (pressing member)
14 Flange 15 Sealing member 16 Joining member 20 Case (second case)
30 cases (third case)
40 Gate valve 50 Shut-off member 51 Crown portion 52 Brim portion P Gas pipe (an example of a fluid pipe)
PE1 Pipe end PE2 Pipe end

Claims (6)

A blocking member attached to an upstream pipe end of the pair of pipe ends in a first case surrounding a pair of pipe ends formed by cutting off a part of a fluid pipe in an indefinite flow state. Removing the
Disposing the blocking member inside a second case connected to the opening of the first case via a gate valve, and closing the gate valve;
Arranging a lid member in the second case connected to the gate valve or in the third case connected to the gate valve instead of the second case;
Opening the gate valve, attaching the lid member to the first case, and sealing the opening of the first case with the lid member;
Removing the gate valve from the first case.   The fluid pipe shutoff releasing method according to claim 1, wherein in the step of removing the shutoff member, a press member provided in the first case is pressed from the outside, thereby pressing the shutoff member toward the downstream side. The blocking member has a cap shape having a crown portion covering a pipe end and a brim portion protruding in a hook shape,
The fluid pipe blocking release method according to claim 2, wherein in the step of removing the blocking member, the pressing member presses the brim portion of the blocking member. Until the blocking member is removed from the pipe end, the brim portion is pressed against the flange-shaped member fixed to the outer periphery of the upstream pipe end,
The fluid pipe shut-off release method according to claim 3, wherein in the step of removing the shut-off member, an outer peripheral portion of the brim portion that protrudes outward from the flange-like member is pressed by the pressing member. The gate valve is joined to an outer peripheral portion of a flange formed in the opening of the first case,
The fluid pipe shutoff releasing method according to any one of claims 1 to 4, wherein the lid member is joined to an inner peripheral portion of the flange when the lid member is attached to the first case. Until the lid member is joined to the flange, the through-hole formed in the inner peripheral portion of the flange is sealed with a sealing member,
The fluid pipe according to claim 5, wherein when the lid member is joined to the flange, a joining member is attached to the through-hole instead of the sealing member, and the lid member is fixed to the flange by the joining member. Block release method.

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