JP2016200209A - Pipe sealing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for sealing a pipe line capable of performing the sealing even when burrs or the like exist on an inner part of the pipe line.SOLUTION: A method for sealing a pipe line includes: a branched path attaching process; a boring process for boring a hole 7H on a part on which a branched path 10 on a lateral surface of the pipe line 7 is attached; a guide pipe inserting process for inserting a guide pipe 11 which assumes a pipe shape and has a curved tip part 11A side from a rear end part 10X of the branched path 10 and inserting the guide pipe 11 until the tip part 11A of the guide pipe 11 is arranged on an inner part of the pipe line 7; a sealing device 20 inserting process for inserting a sealing device 20 having a main body part 21 which assumes a pipe shape and a sealing part 22 which is provided on the tip part of the main body part 21 and can be expanded by fluid circulated through the main body part 21 from a rear end part 11X of the guide pipe 11 and arranging the sealing device onto a position on which the sealing part 22 is protruded from the tip part 11A of the guide pipe 11; and a sealing process for circulating fluid through the main body part 21 of the sealing device 20, expanding the sealing part 22 and sealing the pipe line 7.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for sealing a pipeline.

  Conventionally, an uninterrupted water branching method has been adopted when a new pipe is attached to an existing pipe (hereinafter referred to as “pipe”) without water shutoff or gas shutoff. In the continuous water branching method, a branch pipe is attached to the outside of a pipe, a drilling machine is placed inside the branch pipe, a hole is made in the side wall of the pipe, and a new pipe is connected to the branch pipe. And the valve of a branch pipe is opened, and water is supplied and ventilated to a new pipe.

  By the way, in the nuclear power plant, when the pressure in the reactor containment vessel becomes lower than the pressure in the gas phase part in the suppression chamber (pressure suppression chamber), the gas phase is caused to flow into the reactor containment vessel from the suppression chamber. For this purpose, a vacuum breaker is installed (see Patent Document 1 below).

  When blocking the water flowing through the inside of the vacuum breaker, the inside of the vacuum breaker may be sealed. In this case, the guide pipe formed in a tubular shape can be attached to the vacuum breaker by applying the continuous water branching method described above. And the rod-shaped member provided with the seal member which can expand | swell at the front-end | tip passes through the inside of a guide pipe, and is inserted in the inside of a vacuum breaker. After the insertion, the seal member provided at the tip of the rod-shaped member is expanded to seal the inside of the vacuum breaker.

JP 2006-145343 A

However, when a hole is made in the side wall of a pipe line such as a vacuum breaker with a punching machine as described above, a protrusion (burr) may be generated inside the pipe line due to the drilling. Further, when the guide pipe is fixed to the pipe with a screw such as a tapping screw whose tip is pointed like a drill, the tip of the screw sharp like a drill may protrude inside the pipe.
In these cases, at the stage where the seal member passes through the guide pipe and is arranged inside the pipe, the seal member gets caught on the tip of the burr or screw and is damaged or does not advance any further. There is a problem that the sealing member cannot be arranged and sealed.

  Therefore, the present invention has been made in view of the above circumstances, and provides a method for sealing a pipeline that can seal even if there are obstacles such as burrs inside the pipeline.

In order to achieve the above object, the present invention employs the following means.
That is, the pipe line sealing method according to the present invention is a pipe line sealing method for sealing the inside of a pipe line, and is formed on a side surface of the pipe line in a direction intersecting the pipe line and formed in a tubular shape. A branch path mounting step for attaching the branch path, a perforating process for forming a hole in a portion of the side surface of the pipe where the branch path is mounted, and a rear end portion of the branch path with a guide pipe that is tubular and has a bent distal end side A guide tube inserting step of inserting the guide tube until the tip end portion of the guide tube is disposed inside the conduit, and a main body portion that is tubular and in which fluid can flow. A sealing device provided at a distal end portion of the main body portion and having a seal portion that is expandable by the fluid flowing through the main body portion is inserted from a rear end portion of the guide tube, and the seal portion is connected to the guide tube. Seal placed at a position protruding from the tip A location insertion step, the made to flow the fluid to the body portion of the sealing device, said sealing portion is inflated, characterized in that it comprises a sealing step of sealing the conduit.

  In the conduit sealing method configured as described above, the guide tube is inserted until the distal end portion of the guide tube is disposed inside the conduit by the guide tube insertion step. By the sealing device insertion step, the sealing device is inserted from the rear end portion of the guide tube, and the seal portion is disposed at a position protruding from the tip portion of the guide tube. Even if burrs are generated around the hole in the pipe line due to the drilling process, or the tip of the screw that attaches the branch path in the branch path mounting process protrudes into the pipe line, the seal part passes through the inside of the guide pipe. They will not be damaged by contact with obstacles such as the burrs or screw tips. Therefore, the pipe line can be sealed by performing a sealing process in which a fluid is circulated through the main body of the sealing device and the sealing portion is expanded at a position where the sealing portion protrudes from the distal end portion of the guide tube.

  Further, in the conduit sealing method according to the present invention, in the guide tube inserting step, the guide tube is inserted to a position closer to a side surface facing the hole than to the hole side in the conduit. Is preferred.

  In the conduit sealing method configured as described above, in the guide tube insertion step, the guide tube is inserted to a position closer to the side surface facing the hole than to the hole side. Therefore, the guide tube is disposed at a position sufficiently separated from the hole formed in the conduit, and the seal portion protruding from the tip portion of the guide tube is also disposed at a position sufficiently separated from the hole. Therefore, even if there is an obstacle near the hole, the seal portion does not come into contact with the obstacle and is not damaged.

  According to the method for sealing a pipeline according to the present invention, it is possible to seal even if an obstacle such as a burr is present inside the pipeline.

It is a mimetic diagram of a nuclear power plant which is an example of an execution object of a pipe line sealing method concerning one embodiment of the present invention. It is the A section enlarged view of FIG. It is a figure explaining the guide pipe insertion process of the sealing method of the pipe line concerning one embodiment of the present invention. It is a figure which shows the middle of the sealing apparatus insertion process of the sealing method of the pipe line which concerns on one Embodiment of this invention. It is a figure which shows after the sealing apparatus insertion process of the sealing method of the pipe line which concerns on one Embodiment of this invention.

As an object on which a pipe line sealing method according to an embodiment of the present invention is implemented, a nuclear power plant will be described as an example with reference to the drawings.
First, a nuclear power plant will be described.
FIG. 1 is a schematic diagram of a nuclear power plant that is an example of an implementation target of a pipe sealing method according to an embodiment of the present invention. FIG. 2 is an enlarged view of part A in FIG.

  As shown in FIGS. 1 and 2, the nuclear power plant 1 includes a nuclear reactor containment vessel 3 in which a nuclear reactor pressure vessel 2 is installed, and a suppression chamber 4 connected to the nuclear reactor containment vessel 3.

  The suppression chamber 4 is connected to the reactor containment vessel 3 by a vent pipe 5. When the pressure in the reactor containment vessel 3 rises due to steam or the like, this suppression chamber 4 introduces this steam through the vent pipe 5 and cools it to lower the pressure.

  A downcomer 6 is provided at the tip of the vent pipe 5. The downcomer 6 has a pair of pipe portions 6A and 6A provided at the tip of the vent pipe 5.

  Further, the reactor containment vessel 3 is provided with a vacuum breaker (pipe) 7 that is connected to the suppression chamber 4 and the vent pipe 5 and is formed in a tubular shape. The vacuum breaker 7 allows the gas phase to flow into the reactor containment vessel 3 from the suppression chamber 4 when the pressure in the reactor containment vessel 3 becomes lower than the pressure in the gas phase portion in the suppression chamber 4.

  Further, the suppression chamber 4 is provided with a T-quencher pipe 9 for condensing water vapor or the like exhausted when a main steam relief safety valve (not shown) is operated.

  Next, a pipe line sealing method that is performed to stop the water flowing through the inside of the vacuum breaker 7 of the reactor containment vessel 3 will be described.

First, a branch path attachment process is performed.
As shown in FIG. 3, a guide pipe (branch path) 10 formed in a tubular shape is attached to the side surface of the vacuum breaker 7. In the present embodiment, the guide pipe 10 is attached so as to be substantially perpendicular to the extending direction of the vacuum breaker 7. The guide pipe 10 is attached by, for example, a tapping screw (not shown; the same applies hereinafter). Further, the inner diameter of the guide pipe 10 is set such that a guide pipe 11 described later can be inserted.

Next, a perforation process is performed.
A drilling machine (not shown; the same applies hereinafter) is inserted from the rear end of the guide pipe 10 (the end opposite to the end 10A connected to the vacuum breaker 7) 10X. A hole 7H is opened in a portion where the guide pipe 10 is attached on the side surface of the vacuum breaker 7. Next, the drilling machine is removed from the inside of the guide pipe 10. Thereby, the vacuum breaker 7 and the guide pipe 10 are communicated.
At this time, protrusions (burrs) 7B may be generated on the wall portion around the hole 7H in the vacuum breaker 7 due to the perforation.

  Subsequently, the guide tube 11 is prepared. The guide tube 11 is formed of a deformable member in this embodiment. For example, a sheath tube, a sheath tube, or the like can be employed as the guide tube 11. In addition, the inner diameter of the guide tube 11 is set such that a seal device 20 described later can be inserted.

Next, a guide tube insertion step is executed.
The distal end portion 11A side of the guide tube 11 is bent so as to be substantially perpendicular to the extending direction on the rear end portion 11X side of the guide tube 11. In this manner, with the distal end portion 11A side of the guide tube 11 bent, the distal end portion 11A of the guide tube 11 is inserted from the rear end portion 10X of the guide pipe 10. Then, inside the guide pipe 10, the guide tube 11 is moved to the vacuum breaker 7 side, and is advanced from the hole 7H into the vacuum breaker 7. And in the inside of the vacuum breaker 7, the front-end | tip part 11A of the guide tube 11 is orient | assigned to a predetermined direction. A camera (not shown; the same shall apply hereinafter) or the like may be provided at the distal end portion 11A of the guide tube 11, and adjustment may be made so that the distal end portion 11A faces a predetermined direction from the image of the camera.

  Here, it is preferable to insert the guide tube 11 to a position where the distal end portion 11A of the guide tube 11 is close to the side surface 7S side facing the hole 7H inside the vacuum breaker 7.

  A sealing device 20 is prepared. The seal device 20 includes a deformable introduction pipe (main body part) 21 having a tubular shape, and a seal part 22 provided at a distal end portion of the introduction pipe 21.

  The seal portion 22 communicates with the introduction tube 21 and can be expanded by gas, fluid, or the like supplied from the introduction tube 21. The seal portion 22 is formed in a bag shape with a flexible material. In a state before being inserted into the guide tube 11, the seal portion 22 is in a contracted state. In the present embodiment, the seal portion 22 is formed of canvas, for example.

Next, a sealing device insertion process is performed.
As shown in FIG. 4, the sealing device 20 is inserted from the rear end portion 11 </ b> X of the guide tube 11. The seal portion 22 of the sealing device 20 advances inside the guide tube 11 along the extending direction of the guide tube 11. Since the distal end portion 11A side of the guide tube 11 is bent, the introduction tube 21 of the seal portion 22 is also bent along the inner surface of the guide tube 11 and advances. The seal device 20 is advanced to a position where the seal portion 22 protrudes from the distal end portion 11A of the guide tube 11.

  When the protrusion 7B generated on the wall portion around the hole 7H in the vacuum breaker 7 is generated, the seal portion 22 is sufficiently separated from the protrusion 7B from the image of the camera provided at the distal end portion 11A of the guide tube 11. Make sure that

Then, as shown in FIG. 5, the guide tube 11 is pulled out from the vacuum breaker 7 and the guide pipe 10. In the present embodiment, since the guide tube 11 is formed of a deformable member, the distal end portion 11 </ b> A is linearly deformed and pulled out along the extending direction of the introduction tube 21.
Note that the guide tube 11 does not have to be pulled out from the vacuum breaker 7 and the guide pipe 10 as long as there is no hindrance to the expansion of the seal portion 22 in the sealing step described later.

Next, a sealing process is performed.
A sealing material (fluid) S is injected from the rear end portion 21 </ b> X of the introduction pipe 21 of the sealing device 20. As the sealing material S, a fluid material such as gas, liquid or mortar can be employed.

  The sealing material S passes through the introduction pipe 21 and reaches the seal portion 22 communicated with the introduction pipe 21. The seal portion 22 expands due to the supplied seal material S. Then, when there is no gap between the seal part 22 and the vacuum breaker 7 and the outer surface of the seal part 22 comes into contact with the inner face of the vacuum breaker 7, the supply of the seal material S is stopped. This completes the sealing inside the vacuum breaker 7 (see the two-dot chain line shown in FIG. 5).

  In the conduit sealing method configured as described above, the guide tube 11 is inserted until the distal end portion 11A of the guide tube 11 is disposed inside the vacuum breaker 7 by the guide tube insertion step. By the sealing device insertion step, the sealing device 20 is inserted from the rear end portion 11X of the guide tube 11, and the seal portion 22 is disposed at a position protruding from the tip portion of the guide tube 11. Even if a burr is generated around the hole 7H in the vacuum breaker 7 due to the drilling process, or the tip of the tapping screw for attaching the guide pipe 10 in the branch path attaching process protrudes into the vacuum breaker 7, the seal portion 22 Since it passes through the inside of the guide tube 11, it does not come into contact with an obstacle such as the tip of the burr or screw to be damaged. Therefore, the vacuum breaker is configured by performing a sealing process in which the sealing material S is circulated through the introduction tube 21 of the sealing device 20 and the sealing portion 22 is expanded at a position where the sealing portion 22 protrudes from the distal end portion 11A of the guide tube 11. If 7 is sealed, the flow of water inside the vacuum breaker 7 can be stopped. Moreover, it can seal in the said desired location by arrange | positioning the seal part 22 in a desired location.

  In the guide tube inserting step, the guide tube 11 is inserted in the vacuum breaker 7 to a position closer to the side surface 7S side facing the hole 7H side than to the hole 7H side. Therefore, the guide tube 11 is disposed at a position sufficiently separated from the hole 7H formed in the vacuum breaker 7, and the seal portion 22 protruding from the distal end portion 11A of the guide tube 11 is also sufficiently spaced from the hole 7H. Placed in. Therefore, even if there is an obstacle in the vicinity of the hole 7H, the seal portion 22 does not come into contact with the obstacle and is not damaged.

  In addition, the guide tube 11 is not pulled out after the sealing device insertion step, and the seal portion 22 is expanded at the tip portion 11A of the guide tube 11 while the seal portion 22 is expanded in the sealing step (in the seal portion 22). You may make it support the joint part side with the introductory tube 21). Thereby, the seal part 22 can suitably resist the water pressure inside the vacuum breaker 7.

  The various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

As shown above, after sealing a predetermined location in the vacuum breaker 7, the guide tube 11 is inserted again from the guide pipe 10, and the tip portion 11A of the guide tube 11 is directed to another location to be sealed. And the other sealing apparatus 20 is inserted in the inside of the induction | guidance | derivation pipe 11, and it installs in the location which wants to seal the seal part 22, and seals it. In this way, the vacuum breaker 7 can be sealed at a plurality of locations at the same time.
Alternatively, in the sealing device 20, if the seal portion 22 is detachable from the introduction tube 21, the seal portion 22 is installed and sealed at a predetermined location, and then the seal portion 22 is separated and left to be introduced. Pull 21 out of the guide pipe 10. A new seal portion 22 is attached to the introduction pipe 21. The guide tube 11 is inserted again from the guide pipe 10, and the tip portion 11A of the guide tube 11 is directed to another place to be sealed. Then, the introduction pipe 21 fitted with a new seal portion 22 may be inserted into the guide tube 11 and the seal portion 22 may be installed and sealed at a location where sealing is desired. If there is no hindrance to the expansion of the seal portion 22, the orientation of the tip portion 11A of the guide tube 11 may be changed so as to be directed to the direction to be sealed without pulling out the guide tube 11.

7 ... Vacuum breaker (pipe)
7H ... hole 11 ... guide pipe 10 ... guide pipe (branch path)
20 ... Sealing device 21 ... Introduction pipe (main part)
22 ... Seal part S ... Seal material

Claims (2)

A pipe sealing method for sealing the inside of a pipe,
A branch path attaching step for attaching a branch path that extends in a direction intersecting the pipe path and is formed in a tubular shape to a side surface of the pipe path;
A drilling step of making a hole in a portion of the side surface of the pipe to which the branch is attached;
Guide tube insertion in which a guide tube having a tubular shape and having a bent distal end portion is inserted from the rear end portion of the branch passage, and the guide tube is inserted until the distal end portion of the guide tube is disposed inside the conduit passage. Process,
A sealing device having a tubular main body portion in which fluid can flow and a seal portion that is provided at a distal end portion of the main body portion and is expandable by the fluid flowing through the main body portion. A sealing device insertion step of inserting from a rear end portion and arranging the seal portion at a position protruding from the tip end portion of the guide tube;
And a sealing step of sealing the pipeline by causing the fluid to flow through the body portion of the sealing device and expanding the seal portion.   2. The conduit according to claim 1, wherein, in the guide tube insertion step, the guide tube is inserted to a position closer to a side surface facing the hole than to the hole side in the conduit. Sealing method.

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