JP2015224842A - Linear member inserting method and linear member inserting unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear member inserting method capable of guiding the linear member in a prescribed direction and a linear member inserting unit.SOLUTION: A jig 20 comprises a main body part 21 that can be inserted into the first tubular part G and a bent part 22 bent and extending from one end 21X of the main body part 21. A linear member inserting method of this invention comprises the steps of inserting the jig from the other end G1 of the first tubular part G; and arranging the jig 20 in the second tubular part 7 in such a way that the bent part 22 may face toward a crossing direction -X; inserting the other end 21Y of the main body part 21 of the jig 20 into a ring part 31 of the linear member 30, and moving the linear member 30 along the jig 20 from the other end G1 of the first tubular part G1 toward the crossing direction -X of the second tubular part 7.

Description

  The present invention relates to a linear member insertion method and a linear member insertion unit.

In general, a steam generator of a nuclear power plant includes a plurality of tube support plates that are formed adjacent to each other with tube holes formed therein, and heat transfer tubes that are inserted through the tube holes of the plurality of tube support plates. At the time of manufacturing this steam generator, it is attached to the end of the heat transfer tube insertion side as a heat transfer tube insertion jig for inserting the heat transfer tube into the tube hole of the tube support plate and arranging the heat transfer tube at a predetermined position. A tool including a first insertion jig and a second insertion jig that engages with the first insertion jig has been proposed (see Patent Document 1 below).
When placing the heat transfer tube in the steam generator using this heat transfer tube insertion jig, engage the first insertion jig with the end of the heat transfer tube and place the heat transfer tube in the tube hole of the tube support plate. Insert. Then, by engaging the second insertion jig with the first insertion jig and drawing the second insertion jig, the heat transfer tube engaged with the first insertion jig is drawn and placed at a predetermined position. Is done.

  However, when a linear member such as a heat transfer tube is disposed at a predetermined position, the heat transfer tube insertion jig as described above is used in a situation where it is difficult to pull the inserted heat transfer tube from the distal end side. I can't.

  Here, a vacuum breaker formed in a tubular shape is connected to the suppression chamber installed in the nuclear reactor containment vessel of the nuclear power plant. A material such as mortar (hereinafter referred to as “filler”) may be filled in the suppression chamber through the vacuum breaker. When supplying a filler into the suppression chamber or the like, a tubular guide pipe is connected to the side of the vacuum breaker so that the vacuum breaker communicates with the guide pipe, and a hose is connected from the opening side of the guide pipe. Insert and supply filler.

JP 2009-168405 A

  However, when a hose is inserted from the opening side of the guide pipe, the hose hits the inner surface of the vacuum breaker after passing through the guide pipe. Since the hose is formed of a material having flexibility such as rubber, the hose may extend to one side of the vacuum breaking device or the other side after hitting the inner surface of the vacuum breaking device. Therefore, there exists a problem that a hose cannot be arrange | positioned in the desired direction of a vacuum breaker.

  The present invention has been made in view of the above circumstances, and provides a linear member insertion method and a linear member insertion unit capable of guiding a linear member in a predetermined direction.

In order to achieve the above object, the present invention employs the following means.
That is, the linear member insertion method according to the present invention includes a first tubular portion formed in a tubular shape, and at least one intersecting direction intersecting the extending direction of the first tubular portion from one end of the first tubular portion. A tubular member having a second tubular portion extending in a tubular shape is provided with an annular ring portion, and a linear member that is flexible and formed in a linear shape is used in addition to the first tubular portion. A linear member insertion method in which the linear member is inserted from an end and arranged to extend in the intersecting direction of the second tubular portion, the rod-shaped main body portion configured to be inserted through the first tubular portion; A jig insertion step of inserting a jig having a bent portion extending from one end of the main body portion and capable of being inserted into the first tubular portion from the other end of the first tubular portion; In the second tubular part, the jig is arranged so that the bent part faces the crossing direction. A jig arranging step, and inserting the ring portion of the linear member into the other end side of the main body portion of the jig, and passing the linear member along the jig of the first tubular portion. A moving step of moving the second tubular portion from the other end in the intersecting direction of the second tubular portion.

  In the linear member insertion method configured as described above, the jig is inserted from the other end of the first tubular portion in the jig insertion step. In the jig arranging step, the jig is arranged so that the bent portion of the jig faces the crossing direction of the second tubular portion. In the moving process, the ring portion of the linear member is inserted into the main body portion of the jig. By moving the linear member along the jig from the other end of the first tubular portion toward the intersecting direction of the second tubular portion, the distal end side of the linear member faces the intersecting direction in which the second tubular portion extends. Arranged. Therefore, the linear member is guided in the crossing direction within the second tubular portion.

  Further, the linear member insertion unit according to the present invention includes a first tubular portion formed in a tubular shape, and at least one intersecting direction intersecting the extending direction of the first tubular portion from one end of the first tubular portion. A rod-like main body portion that is configured to be inserted into the first tubular portion, and is an insertion unit for a linear member that is inserted into a duct having a second tubular portion that extends in a tubular shape. A jig having a bent portion that is bent from one end of the tube and is configured to be inserted into the first tubular portion and an annular ring portion are provided, and are formed in a linear shape with flexibility. A linear member, wherein the ring portion can be inserted into the jig, and the main body portion and the bent portion guide the linear member.

  In the linear member insertion unit configured as described above, the ring portion of the linear member is inserted into the jig, and the linear member is guided along the main body portion and the bent portion of the jig. Therefore, the tip of the linear member is arranged in the direction in which the bent portion of the jig extends. Therefore, the linear member is guided in the crossing direction within the second tubular portion.

  In the linear member insertion unit according to the present invention, the linear member may be formed in a tubular shape.

  In the linear member insertion unit configured as described above, the fluid introduced from the rear end side of the linear member formed in a tubular shape passes through the inside of the linear member and is led out from the tip of the bent portion. The Therefore, the fluid introduced from the other end side of the first tubular portion can be supplied to the side where the bent portion faces in the intersecting direction in the second tubular portion.

  Further, in the linear member insertion unit according to the present invention, the main body portion may be provided with a direction display portion indicating a bending direction of the bent portion.

  In the linear member insertion unit configured as described above, the main body portion is provided with a direction display portion that indicates a bending direction of the bending portion. Therefore, since the direction in which the bent portion of the jig is bent with respect to the main body portion can be seen by looking at the direction display portion, the bent portion can be directed in a desired direction in the second tubular portion.

  According to the linear member insertion method and the linear member insertion unit according to the present invention, the linear member can be guided in a predetermined direction.

It is a schematic diagram of the nuclear power plant which is an example of the insertion target object used as the insertion target of the insertion unit of the linear member which concerns on one Embodiment of this invention. It is the A section enlarged view of FIG. It is a perspective view which shows the insertion unit of the linear member which concerns on one Embodiment of this invention. In a nuclear power plant using a linear member insertion unit according to an embodiment of the present invention, (a) a T-quencher tube is closed, (b) a vent tube is closed, (c) a vacuum breaker It is a schematic diagram which shows a mode that is closed. (A) A state in which the T-quencher pipe and the downcomer are closed by a method different from the method shown in FIG. 4 in the nuclear power plant using the linear member insertion unit according to the embodiment of the present invention, (b) It is a schematic diagram which shows a mode that a vacuum breaker closes.

A linear member insertion unit according to an embodiment of the present invention is used as an object, and a nuclear power plant is taken as an example and described 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 insertion object to be inserted by a linear member insertion unit 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 reactor containment vessel 3 in which a reactor pressure vessel 2 is installed, and a suppression chamber 4 connected to the 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.

  In addition, the reactor containment vessel 3 is provided with a vacuum breaker (second tubular portion) 7 connected to the suppression chamber 4 and the vent pipe 5 and 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, the linear member insertion unit 10 will be described.
FIG. 3 is a perspective view showing the linear member insertion unit according to the present embodiment.
The linear member insertion unit 10 includes a jig 20 and a hose (linear member) 30.

  The jig 20 includes a main body portion 21 extending along the direction of the axis O, and a bent portion 22 that is bent and extends from an end portion (one end) 21 </ b> X of the main body portion 21. In the present embodiment, the bent portion 22 is bent at a substantially right angle with respect to the axis O direction of the main body portion 21.

  The main body 21 and the bent portion 22 are configured to be able to be inserted into a guide pipe G to be inserted later. Specifically, the diameter of the main body 21 is smaller than the inner diameter of the guide pipe G. Further, the extension length L of the bent portion 22 from the main body portion 21 is smaller than the inner diameter of the guide pipe G.

  Further, a mark portion (direction display portion) 26 that indicates a bending direction of the bending portion 22 is provided on the end (other end) 21Y side of the main body portion 21 of the jig 20. In the present embodiment, the mark portion 26 is formed in a semicircular shape. The mark portion 26 is provided on the other end side of the main body portion 21 so as to swell in the same direction as the direction in which the bent portion 22 is provided with respect to the main body portion 21.

  The hose 30 is flexible and formed in a tubular shape. An annular guide ring (ring part) 31 is provided on the tip 30 </ b> X side of the hose 30.

The jig 20 can be inserted into the guide ring 31. In the present embodiment, the guide ring 31 is configured such that a part of the guide ring 31 can be opened and closed. For example, an opening portion (not shown) is formed in a part of the guide ring 31 to be in an open state, and the opening portion is closed to be in a closed state. When the guide ring 31 is open, the jig 20 can be inserted into the guide ring 31 from the opening, and then the opening is closed and the guide ring 31 is closed.
Alternatively, the jig 20 may be inserted into the guide ring 31 by setting the inner diameter of the guide ring 31 to be larger than that of the main body 21 and the mark portion 26 provided on the main body 21.

  The rigidity of the jig 20 is higher than the rigidity of the hose 30. Thereby, the hose 30 is guided along the extending direction of the jig 20. That is, the tip 30 </ b> X of the hose 30 moves from the end 20 </ b> Y of the main body 21 of the jig 20 toward the end 21 </ b> X along the main body 21, and then moves toward the tip 22 </ b> X of the bent 22 along the bent 22. Move. In the present embodiment, the jig 20 is made of steel, and the hose 30 is made of rubber, resin, or the like.

  Next, a method of supplying a material such as mortar (hereinafter, “material”) to a predetermined portion in the reactor containment vessel 3 using the linear member insertion unit 10 configured as described above will be described. There are two methods of supplying the material, Method A and Method B.

(Method A)
FIG. 4 shows a state where (a) the T-quencher pipe 9 is closed, (b) the vent pipe 5 is closed, (c) a vacuum breaker in the nuclear power plant 1 using the linear member insertion unit 10. It is a schematic diagram which shows a mode that 7 closes. In addition, the insertion unit 10 of a linear member is abbreviate | omitted in this figure.
First, the method A will be described with reference to FIGS.
The pipe communication process is executed.
A hole 7 </ b> A is formed on the side surface of the vacuum breaker 7. An end portion of a guide pipe (first tubular portion) G formed in a tubular shape is connected to the hole portion 7A. Thereby, the vacuum breaker 7 and the guide pipe G are connected.

  Here, let the extending direction of the vacuum breaker 7 be the X direction from the −X side to the + X side, and let the extending direction of the guide pipe G be the Y direction. Then, with respect to the vacuum breaker 7, a guide pipe G is provided in the middle of the vacuum breaker 7 in the X direction. In the present embodiment, the guide pipe G is provided at a substantially right angle to the vacuum breaker 7. Thus, the vacuum breaker 7 and the guide pipe G constitute the pipe line 7G.

Next, a jig insertion step is executed.
That is, the tip 22X of the bent portion 22 of the jig 20 is inserted from the end (other end) G1 on the opening side of the guide pipe G.

Next, a jig arrangement process is executed.
That is, the jig 20 is inserted through the guide pipe G, and the jig 20 is moved until the tip 22X of the jig 20 is positioned in the vacuum breaker 7. And the jig | tool 20 is arrange | positioned so that the mark part 26 provided in the main-body part 21 of the jig | tool 20 may face the side which wants to supply the material mentioned later in the vacuum breaker 7. FIG. In the present embodiment, the material is supplied in the −X direction (crossing direction), and the mark portion 26 is disposed so as to face the −X direction. Here, when the mark portion 26 faces in a direction different from the −X direction, the jig 20 may be rotated around the axis O so that the mark portion 26 faces the −X direction. Since the bent portion 22 of the jig 20 is provided so as to face the same side as the side where the mark portion 26 faces, if the mark portion 26 is arranged to face the −X direction, the bent portion 22 is also − It faces the X direction.

Next, a moving process is executed.
That is, the end 21 </ b> Y side of the jig 20 is inserted into the guide ring 31 provided on the hose 30. When the hose 30 is moved along the jig 20, the hose 30 bends along the bent portion 22 after moving along the main body portion 21 of the jig 20. Thus, the tip 33 </ b> X of the hose 30 is disposed so as to extend in the −X direction in the vacuum breaker 7.

  Next, when the material M is supplied from the rear end 30Y of the hose 30 as shown in FIG. 3, the material M passes through the hose 30 and is discharged from the front end 30X of the hose 30, and in the vacuum breaker 7 in the -X direction. Supplied. Then, as shown in FIG. 4A, the material M passes through the vacuum breaker 7, the vent pipe 5 and the downcomer 6 and is supplied to the lower part of the suppression chamber 4 and above the tip of the T quencher pipe 9. The material M is filled until the T quencher tube 9 is closed.

  Next, as shown in FIG. 4B, the tip 5X of the vent pipe 5 is closed, and the supply of the material M to the hose 30 is continued. The material M is supplied to the lower part of the vent pipe 5 and filled in the tip 5X side of the vent pipe 5, and the vent pipe 5 is closed.

  Next, both ends 7X and 7Y of the vacuum breaker 7 are closed, and the supply of the material M to the hose 30 is continued. The material M is supplied between the ends 7X and 7Y in the vacuum breaker 7, and the vacuum breaker 7 is closed.

(Method B)
FIG. 5 shows (a) how the T-quencher tube 9 and the downcomer 6 are closed in the nuclear power plant 1 by using a method different from the method A shown in FIG. ) It is a schematic diagram showing how the vacuum breaker 7 is closed. In addition, the insertion unit 10 of a linear member is abbreviate | omitted in this figure.
Next, Method B will be described with reference to FIGS.
Similarly to the method A, the pipe line communication process, the jig insertion process, the jig arrangement process, and the movement process described above are executed.

  As shown in FIG. 3, when the material M is supplied from the rear end 30 </ b> Y of the hose 30, the material M passes through the hose 30 and is discharged from the tip 30 </ b> X of the hose 30, and is supplied in the −X direction by the vacuum breaker 7. The Then, as shown in FIG. 5A, the material M passes through the vacuum breaker 7, the vent pipe 5 and the downcomer 6, is supplied to the lower part of the suppression chamber 4, and is filled above the tip of the downcomer 6. Then, the T quencher tube 9 and the downcomer 6 are closed.

  Next, both ends 7X and 7Y of the vacuum breaker 7 are closed, and the supply of the material M to the hose 30 is continued. The material M is supplied between the ends 7X and 7Y in the vacuum breaker 7, and the vacuum breaker 7 is closed.

  If the material M is supplied to a predetermined portion in the reactor containment vessel 3 using the linear member insertion unit 10 configured as described above, the jig 20 is connected to the guide pipe G in the jig insertion step. Inserted from the end G1. In the jig arranging step, the jig 20 is arranged so that the bent portion 22 of the jig 20 faces the −X direction of the vacuum breaker 7. In the moving process, the main body 21 of the jig 20 is inserted into the guide ring 31 of the hose 30. By moving the hose 30 along the jig 20 from the end G1 of the guide pipe G toward the -X direction of the vacuum breaker 7, the tip 30X of the hose 30 faces the -X direction of the vacuum breaker 7. Arranged. Therefore, the hose 30 guides the vacuum breaker 7 to the −X side.

  In addition, the material M introduced from the rear end 30 </ b> Y of the hose 30 passes through the inside of the hose 30 and is discharged in the −X direction of the vacuum breaker 7. Therefore, the material M introduced from the end G1 side of the guide pipe G can be supplied to the −X side of the vacuum breaker 7.

  Further, since the rigidity of the jig 20 is higher than the rigidity of the hose 30, the hose 30 can be reliably guided along the jig 20.

  The main body 21 is provided with a mark portion 26 that indicates the direction in which the bent portion 22 is bent. Therefore, since the direction in which the bent portion 22 of the jig 20 is bent with respect to the main body portion 21 can be seen by looking at the mark portion 26, the hose 30 can be reliably guided in a desired direction in the vacuum breaker 7. it can.

  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.

  In the embodiment described above, the nuclear power plant 1 has been described as an example, but the present invention is not limited thereto. For example, a conduit having a first tubular portion formed in a tubular shape and a second tubular portion extending in a tubular shape from one end of the first tubular portion in at least one intersecting direction intersecting the extending direction of the first tubular portion As a target, a linear member can be arranged. Therefore, the second tubular portion can also be applied to a linear member arranged so as to extend in one direction from the end portion of the first tubular portion. The second tubular portion can also be applied to a linear member arranged so as to extend in a plurality of directions from the end of the first tubular portion.

  Moreover, in embodiment shown above, although the hose 30 was mentioned as an example and demonstrated as a linear member, this invention is not limited to this. For example, if the linear member is formed in a linear shape, it need not be formed in a tubular shape.

  In the embodiment described above, the extension length L of the bent portion 22 is smaller than the diameter of the guide pipe G, so that the main body portion 21 and the bent portion 22 can be inserted into the guide pipe G. However, the present invention is not limited to this. For example, the bent portion 22 is made of a superelastic alloy having elasticity, can be deformed by a force acting on the bent portion 22, and when the force is removed, the element shown in FIG. The configuration may be restored to the state. In this case, in the jig insertion step, even if the bent portion 22 contacts the inner surface of the guide pipe G and the bent portion 22 is deformed by the frictional force, the bent portion 22 is disposed in the vacuum breaker 7. As shown in FIG. 3, the bent portion 22 can be restored to the original state and can face in the −X direction.

7. Vacuum breaker (second tubular part)
7G ... Pipe line 10 ... Linear member insertion knit 20 ... Jig 21 ... Main body part 22 ... Bending part 26 ... Marking part (direction display part)
30 ... Hose (Linear member)
31 ... Guide ring (ring part)
G ... Guide pipe (first tubular part)
O ... axis-X direction ... cross direction Y direction ... extending direction

Claims (4)

A conduit having a first tubular portion formed in a tubular shape and a second tubular portion extending from one end of the first tubular portion in a tubular shape in at least one intersecting direction intersecting the extending direction of the first tubular portion On the other hand, an annular ring portion is provided, and a linear member that is flexible and formed in a linear shape is inserted from the other end of the first tubular portion, and the intersection of the second tubular portion A method of inserting a linear member that is arranged to extend in a direction,
A jig having a rod-shaped main body portion configured to be inserted into the first tubular portion, and a bent portion configured to bend and extend from one end of the main body portion and to be inserted into the first tubular portion. A jig insertion step for inserting from the other end of the first tubular portion;
In the second tubular portion, a jig placement step of placing the jig so that the bent portion faces the intersecting direction;
The ring portion of the linear member is inserted into the other end side of the main body portion of the jig, and the linear member extends along the jig from the other end of the first tubular portion to the second tubular portion. A linear member insertion method comprising: a moving step of moving the portion toward the crossing direction. A conduit having a first tubular portion formed in a tubular shape and a second tubular portion extending from one end of the first tubular portion in a tubular shape in at least one intersecting direction intersecting the extending direction of the first tubular portion An insertion unit for a linear member to be inserted,
A jig having a rod-like main body portion configured to be inserted into the first tubular portion, and a bent portion configured to be bent and extend from one end of the main body portion and to be inserted into the first tubular portion; ,
An annular ring portion is provided, and includes a linear member that is flexible and formed in a linear shape,
The ring portion can be inserted into the jig,
The linear member insertion unit, wherein the main body portion and the bent portion guide the linear member.   The linear member insertion unit according to claim 2, wherein the linear member is formed in a tubular shape.   The linear member insertion unit according to claim 2 or 3, wherein the main body portion is provided with a direction display portion indicating a direction in which the bent portion is bent.

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