JP6186980B2 - Water stop device - Google Patents

Description

  The present invention relates to a water-stopping material placing device.

  When a severe accident occurs that damages or melts the reactor pressure vessel or the nuclear fuel in it, it is necessary to repair or remove them. In such a state, the inside of the reactor containment vessel has a very high radiation dose. In other words, it is not easy to access the reactor pressure vessel or the reactor containment vessel. For this reason, it is assumed that the reactor containment vessel is submerged and the work is performed after reducing the radiation dose.

  Patent Document 1 below discloses a method for flooding a containment vessel. In this method, as one of the methods of submerging the reactor containment vessel, all the vent pipes connecting between the dry well containing the reactor pressure vessel and the suppression chamber in which the pool is formed are stopped. We have proposed a method (vent pipe closing process) that prevents water leakage by placing water material and closing all the vent pipes.

JP2013-108956A

The vent pipe is made of a large diameter steel pipe having an inner diameter of about 2 m. When blocking such a large-diameter pipe with a water-stopping material, make a horizontal hole for placing the water-stopping material in the pipe you want to close, insert a water-stopping material casting hose into the horizontal hole, and place the water-stopping material The hose is held and a water-stopping material is driven. After the water-stopping material is cast, the lateral hole opened in the pipe is closed.
By the way, if the height of the water-stopping material placed inside the large-diameter pipe is high, the components of the water-stopping material may be separated by the impact at the time of dropping, and will not solidify well and may not function as a water-stopping material. . However, a vent pipe under a high radiation dose environment has a problem that an operator cannot approach the water-stopping material in close proximity.

  The present invention has been made in view of the above-described problems, and is a water-stopping material placing device capable of appropriately closing a pipe to be closed with a water-stopping material even in an environment where workers cannot approach. The purpose is to provide.

In order to solve the above-described problems, the present invention provides a water-stopping material placing device for placing a water-stopping material in a pipe from a lateral hole formed in a pipe via a water-stopping material placing hose. And the structure of having a hose guide part for advancing and retracting the water stop material placing hose with respect to the lateral hole is adopted.
By adopting this configuration, in the present invention, the hose guide portion is provided in the water stop material placing device, and the water stop material placing hose is advanced and retracted with respect to the lateral hole formed in the pipe. In this way, in the present invention, the water stop material placing hose can be held in an environment where an operator cannot approach by the water stop material placing device, and the placement height of the water stop material can be adjusted. It is possible to appropriately close the pipe to be closed with the water-stopping material without separating the components of the water-stopping material by impact.

Moreover, in this invention, the structure of having an engagement fixing | fixed part which regulates the movement in the advancing / retreating direction which engages with the said horizontal hole and the said water stop material placement hose advances / retreats is employ | adopted.
By adopting this configuration, in the present invention, an engagement fixing portion is provided in the water stop material placing instrument and engaged with the lateral hole, thereby restricting movement in the advancing and retreating direction in which the water stop material placing hose advances and retreats. As described above, in the present invention, the water stop material placing hose can be properly guided by the hose guide portion by engaging the water stop material placing device with the lateral hole and performing relative positioning. Moreover, it is possible to prevent detachment of the water stop material placing device due to the reaction force received when placing the water stop material.

Further, in the present invention, a box-shaped housing portion that surrounds the lateral hole outside the tube and forms a lid of the lateral hole with the waterstop material overflowed from the inside of the tube through the lateral hole. The structure of having is adopted.
By adopting this configuration, in the present invention, a box-shaped housing portion is provided in the water-stopping material placing instrument, and the water-stopping material is surrounded by the water-stopping material that surrounds the side hole outside the pipe and overflows through the side hole. Form the lid of the horizontal hole. As described above, in the present invention, the lateral hole into which the water-stopping material placing hose is inserted can be closed without separately closing the lateral hole after completion of the water-stopping material placing.

Moreover, in this invention, the structure which the said water stop material placement hose advances / retreats between the inside of the said pipe | tube and the exterior of the said pipe | tube and the inside of the said box-type housing part is employ | adopted.
By adopting this configuration, in the present invention, the water-stopping material is placed inside the pipe without separating the components of the water-stopping material by allowing the water-stopping material placing hose to enter the pipe. be able to. Further, in the present invention, the water stop material placing hose is retracted outside the pipe and inside the box-type housing part, thereby facilitating filling of the water-stopping material inside the box-type housing part. It is possible to reliably form a lid that closes the lateral hole.

Moreover, in this invention, the said box-shaped housing | casing part is employ | adopted as a structure provided with the pipe | tube contact part which has a shape according to the external shape of the said pipe | tube.
By adopting this configuration, in the present invention, the tube contact portion of the box-shaped housing portion can be in close contact with the external shape of the tube, so that water can be stopped from the gap between the box-shaped housing portion and the tube. It is possible to prevent the leakage of the material, and to fill the box-shaped housing portion with the water-stopping material, thereby reliably forming the lid that closes the lateral hole.

Moreover, in this invention, the said box-shaped housing | casing part employ | adopts the structure of providing the drain part which connects the inside and outside.
By adopting this configuration, in the present invention, a water drainage portion is provided in the box-shaped housing portion, so that water is drained from the inside of the box-shaped housing portion and the water-stopping material is filled in the box-shaped housing portion. Thus, a lid that closes the lateral hole can be reliably formed.

Further, in the present invention, the water stop material placing hose is provided with a flange, and the hose guide portion includes a guide hole having a smaller diameter than the flange, and the water stop material placing hose is A configuration is adopted in which a plate guide portion that can come into contact with the flange when retracted is employed.
By adopting this configuration, in the present invention, when the flange provided on the water stop material placing hose contacts the plate guide provided on the hose guide, the guide hole provided on the plate guide is closed. Therefore, it is possible to prevent leakage of the water-stopping material from the guide hole, and to fill the box-shaped housing portion with the water-stopping material and to reliably form a lid that closes the lateral hole.

  ADVANTAGE OF THE INVENTION According to this invention, even in the environment where an operator cannot approach, the pipe | tube which wants to be obstruct | occluded can be obstruct | occluded appropriately with a water stop material.

It is a longitudinal section showing a schematic structure of a boiling water reactor in an embodiment of the present invention. It is AA sectional drawing of FIG. It is a longitudinal cross-sectional view which shows the structure of the water stop material placement instrument in embodiment of this invention. It is a perspective view which shows the external appearance of the water stop material placement instrument in embodiment of this invention. It is a top view which shows the structure of the hose guide part in embodiment of this invention. It is a figure for demonstrating the operation | work in the vent pipe obstruction | occlusion process using the water stop material placement instrument in embodiment of this invention. It is a figure for demonstrating the operation | work in the vent pipe obstruction | occlusion process using the water stop material placement instrument in embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the engagement fixing | fixed part in another embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the engagement fixing | fixed part in another embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the engagement fixing | fixed part in another embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size. Moreover, in the following description, the example which applied this invention to the method of flooding the MARK-I type | mold reactor containment vessel which is one of the boiling water reactors is demonstrated.

  First, the MARK-I type boiling water reactor 1 will be described. FIG. 1 is a longitudinal sectional view showing a schematic configuration of a boiling water reactor 1 in an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. In FIG. 2, a reactor building 2 described later is omitted. As shown in FIG. 1, a boiling water reactor 1 includes a reactor building 2, a reactor containment vessel 3, a vent header 4, a downcomer 5, a support 6, a reactor pressure vessel 7, The illustrated core is provided.

  The reactor building 2 is a building that houses a reactor containment vessel 3, a vent header 4, a downcomer 5, a support portion 6, a reactor pressure vessel 7, and a core (not shown), and is formed of reinforced concrete. ing. A torus chamber 2a for installing a suppression chamber 3b of a reactor containment vessel 3 to be described later is provided at the lower part of the reactor building 2. Although not shown, the reactor building 2 also stores an emergency core cooling system pump, a purification facility, a fuel pool, an equipment temporary storage pool, an emergency gas processing system facility, and the like.

  The reactor containment vessel 3 includes a dry well 3a that accommodates the reactor pressure vessel, a suppression chamber 3b that is provided around the dry well 3a, and a vent pipe 3c that connects the dry well 3a and the suppression chamber 3b. ing.

  The dry well 3 a is a steel container having a round bottom flask shape, and is installed in the inner wall of the reactor building 2. The suppression chamber 3b is a steel container whose cross-sectional shape is circular as shown in FIG. 1 and whose plan view shape is a polygonal annular shape as shown in FIG. If the suppression chamber 3b is not damaged due to a severe accident, water is stored inside the suppression chamber 3b to form a pool. The vent pipe 3c is provided between the dry well 3a and the suppression chamber 3b, and is a steel pipe that guides the steam to the suppression chamber 3b when the steam leaks into the dry well 3a. As shown in FIG. 2, eight vent pipes 3c are provided. The vent pipes 3c are arranged at equal intervals.

  The vent header 4 is an annular tube disposed concentrically with the suppression chamber 3b inside the suppression chamber 3b. The vent header 4 is connected to the tips of all the vent pipes 3c.

  The downcomer 5 is attached to the vent header 4 connected to the vent pipe 3c. The downcomer 5 is an inverted U-shaped tube member, and has openings 5 a at both ends facing downward, and the top is connected to the vent header 4. In addition, when the pool is formed in the inside of the suppression chamber 3b, the opening 5a of the downcomer 5 is arrange | positioned under the water surface of this pool. Via the downcomer 5, the internal space of the suppression chamber 3b and the vent pipe 3c are connected. As shown in FIG. 2, a plurality of such downcomers 5 are provided along the vent header 4 at equal intervals.

  The support 6 is a reinforced concrete member provided at the bottom of the dry well 3 a and supports the reactor pressure vessel 7. The reactor pressure vessel 7 is fixed on the support portion 6 and disposed inside the dry well 3a. The reactor pressure vessel 7 is a steel vessel and houses a reactor core therein. The core (not shown) is constituted by nuclear fuel and control rods, and is supported inside the reactor pressure vessel 7.

Next, the structure of the water stopping material placing instrument 10 used in the submersion method of the reactor containment vessel 3 having the above structure will be described with reference to FIGS.
In addition, the flooding method of the reactor containment vessel 3 employed in the present embodiment is to place water-stopping material on all the vent pipes 3c (tubes) and close all the vent pipes 3c, thereby preventing water leakage. This is a method of preventing and flooding the containment vessel 3.

FIG. 3 is a longitudinal cross-sectional view showing the configuration of the water-stopping material placing instrument 10 according to the embodiment of the present invention. FIG. 4 is a perspective view showing an appearance of the water stop material placing instrument 10 according to the embodiment of the present invention. FIG. 5 is a plan view showing the configuration of the hose guide portion 20 in the embodiment of the present invention.
As shown in FIG. 3, the water-stopping material placing device 10 places a water-stopping material C into the vent pipe 3c through a water-stopping material placing hose 11 from a lateral hole 3c1 formed in the vent pipe 3c. Is to do.

As the water-stopping material C, for example, a plastic grout material is preferable, and specifically, a material such as concrete that solidifies after elapse of a certain time, a material made of polymer gel, water glass, or the like can be used. In the present embodiment, a plastic grout material is employed as the water stop material C.
The water stop material placing hose 11 is a multi-layered hose having predetermined rigidity and flexibility. A flange 12 is provided at the nozzle tip of the water stop material placing hose 11. The flange 12 may be a member that can be freely attached, such as a nut.

  The water-stopping material placing device 10 has a hose guide portion 20. The hose guide part 20 holds the water stop material placing hose 11 with respect to the horizontal hole 3c1 so as to be able to advance and retreat. The hose guide part 20 has a plurality of guide rollers 21 for guiding the water stop material placing hose 11. The guide roller 21 is a free roller and is provided inside the guide cylinder 22 through which the water stop material placing hose 11 passes.

As shown in FIG. 5 , a plurality of guide rollers 21 are arranged around the water stop material placing hose 11. The guide roller 21 of the present embodiment guides the water stop material placing hose 11 from four directions in plan view. Moreover, the guide roller 21 of this embodiment has the surrounding surface 21a in which the groove | channel according to the surrounding surface shape of the water stop material placement hose 11 was formed. As shown in FIG. 3, the guide roller 21 is provided in a plurality of stages (three stages in the present embodiment) inside the guide cylinder 22.

  A plate guide portion 23 is provided below the lowermost stage of the guide roller 21. The plate guide portion 23 is provided inside the guide tube 22 and has a guide hole 23 a having a smaller diameter than the flange 12 of the water stop material placing hose 11. The diameter of the guide hole 23a is set so that the hose portion of the water stop material placing hose 11 can be inserted while maintaining a predetermined clearance. The plate guide portion 23 is configured to guide the water-stopping material placing hose 11 so that the water-stopping material placing hose 11 can move forward and backward, and to come into contact with the flange 12 when the water-stopping material placing hose 11 retracts upward.

  The water-stopping material placing device 10 has an engagement fixing portion 30. The engagement fixing part 30 engages with the horizontal hole 3c1 and regulates the movement in the advancing / retreating direction in which the water stop material placing hose 11 advances / retreats. The engagement fixing part 30 has a hook 31 that enters the inside of the vent pipe 3c and engages with an edge of the lateral hole 3c1. The hook 31 is rotatably provided on the peripheral surface of the lower end portion (one end portion) of the guide tube 22. Four hooks 31 of this embodiment are provided at equal intervals in the circumferential direction of the guide tube 22.

  The hook 31 is configured to be rotatable from a state folded along the guide tube 22 (shown by a two-dot chain line in FIG. 3) to a state unfolded outside the guide tube 22 (shown by a solid line in FIG. 3). It has become. The engagement fixing part 30 has an operation part 32 for operating the hook 31 from the outside of a box-shaped housing part 40 described later. The operation unit 32 includes a rod 33, a movable ring 34, and a spring member 35. The rod 33 is provided so as to communicate with the inside and outside of a box-shaped housing 40 described later, and connects the hook 31 and the movable ring 34.

  The movable ring 34 is configured to be movable in the axial direction along the peripheral surface of the guide tube 22 outside the box-shaped housing unit 40. When the movable ring 34 is located at the first position (indicated by a two-dot chain line in FIG. 3), each hook 31 is folded, and when the movable ring 34 is located at the second position (indicated by a solid line in FIG. 3). Each hook 31 is developed. The spring member 35 urges the movable ring 34 from the first position toward the second position. The spring member 35 is disposed between the movable ring 34 and the box-shaped housing part 40.

  On the peripheral surface of the upper end portion (the other end portion) of the guide tube 22, a chuck groove 24 is provided for the robot arm to grip the water-stopping material placing device 10. When the robot arm grips the water-stopping material placing device 10, the movable ring 34 is pushed down by the robot arm and the hook 31 is folded. Further, when the robot arm releases the water stop material placing device 10, the movable ring 34 is pushed up by the spring member 35 so that the hook 31 is unfolded.

  The water-stopping material placing instrument 10 has a box-shaped housing part 40. The box-shaped housing portion 40 surrounds the side hole 3c1 outside the vent pipe 3c, and forms a lid for the side hole 3c1 with a water stop material C overflowed from the inside of the vent pipe 3c through the side hole 3c1. It is. The box-shaped casing 40 has a substantially bottomed cylindrical shape that is formed larger than the lateral hole 3c1 (see FIG. 4). A guide tube 22 is inserted through the central portion of the box-shaped housing portion 40 so that the water stop material placing hose 11 passes therethrough.

  The water-stopping material placing hose 11 is filled not only inside the vent pipe 3c but also inside the box-shaped housing portion 40 with the water-stopping material C inside (indicated by a two-dot chain line in FIG. 3). Can be moved forward and backward between the outside of the vent pipe 3c and the inside of the box-shaped housing portion 40 (shown by a solid line in FIG. 3). The guide tube 22 is provided with a through hole 22a, and the water blocking material C is filled to every corner of the box-shaped housing portion 40 through the through hole 22a.

  The box-shaped housing part 40 has a pipe contact part 41 that contacts the outside of the vent pipe 3c. As shown in FIG. 4, the tube contact portion 41 has a shape corresponding to the shape of the outside of the vent tube 3c. That is, the external shape of the vent pipe 3c has a predetermined curvature, and the pipe contact portion 41 has a curved shape corresponding to the curvature. Further, the tube contact portion 41 has a flexible gasket 42. For this reason, even if there is some unevenness on the outside of the vent pipe 3c, the gasket contact portion 41 can come into close contact with the vent pipe 3c because the gasket 42 is flexibly deformed.

  The box-shaped housing part 40 has a water draining part 43. As shown in FIG. 3, the water draining portion 43 has a tubular shape and communicates the inside and outside of the box-shaped housing portion 40. The drain part 43 prevents the water from blocking the filling of the water blocking material C of the box-shaped housing part 40 when water is accumulated in the vent pipe 3c. The drainage portion 43 communicates the inside and the outside at the corner portion 40a of the box-shaped housing portion 40 that becomes the highest when the waterstop material placing device 10 is attached to the bent pipe 3c that extends obliquely. It has become.

Next, a method of flooding the containment vessel 3 (vent pipe closing step) using the waterstop material placement instrument 10 having the above-described configuration will be described with reference to FIGS. 6 and 7.
FIG.6 and FIG.7 is a figure for demonstrating the operation | work in the vent pipe obstruction | occlusion process using the water stop material placement instrument 10 in embodiment of this invention. In the vent pipe closing step, operations are performed in the order of FIGS. 6A, 6B, 7A, and 7B. At the time of starting the vent pipe closing process, the cooling water supply to the reactor pressure vessel 7 is continued, and the cooling water leaking from the reactor pressure vessel 7 is sent to the suppression chamber 3b via the vent pipe 3c. It is assumed that it is flowing out (indicated by arrows in FIGS. 6 and 7).

  First, as shown in FIG. 6A, the robot arm 100 is installed in a room (hereinafter referred to as the upper floor room 2b) provided in the reactor building 2 and located on the upper floor of the torus room 2a. Next, drilling means 101 such as a water jet is attached to the robot arm 100, and the horizontal hole 3c1 and the horizontal hole 3c2 are formed in the vent pipe 3c by remote control. The horizontal hole 3 c 2 is formed at a position corresponding to the connection position of the vent header 4. The horizontal hole 3c1 is formed on the upstream side of the horizontal hole 3c2. The remote operation of the robot arm 100 is performed using a camera (not shown) installed in the torus chamber 2a or the suppression chamber 3b, for example.

  Next, as shown in FIG. 6B, the inflatable seal 102 is introduced into the inside through the lateral hole 3c2 formed in the vent pipe 3c. The inflatable seal 102 is for preventing the water stop material C from flowing out through the vent header 4. The inflatable seal 102 has a bag shape and can be inflated by injecting a filler into the inside. The filler is injected into the inflatable seal 102 through the hose 103 guided by the robot arm 100 from the upper floor chamber 2b.

  Next, as shown to Fig.7 (a), the water stop material placement instrument 10 is installed in the horizontal hole 3c1 formed in the vent pipe 3c. As shown in FIG. 3, the water-stopping material placing instrument 10 has an engagement fixing portion 30 that engages with the lateral hole 3c1. When the robot arm 100 is holding the water stop material placing instrument 10, the movable ring 34 is pushed down, and the hook 31 enters the lateral hole 3c1 in a folded state. After the robot arm 100 adjusts the direction so that the tube contact portion 41 is in close contact with the external shape of the vent tube 3c, the water stop material placing device 10 is released.

  When the robot arm 100 is separated from the water stop material placing device 10, the movable ring 34 is pushed up by the spring member 35 and the hook 31 is deployed. The hook 31 engages with the edge of the horizontal hole 3c1, and the vent pipe 3c is sandwiched in the thickness direction, whereby the installation of the waterstop material placing device 10 is completed. In this way, by adopting a structure in which the vent pipe 3c is sandwiched in the thickness direction, the movement of the water-stopping material placing hose 11 of the water-stopping material placing device 10 in the advancing / retreating direction can be restricted, and rattling can be eliminated. . In addition, if the water stop material placement instrument 10 is installed, the robot arm 100 may be removed in order to work in the next vent pipe 3c.

  Next, as shown in FIG. 7B, the water-stopping material C is driven into the inside of the vent pipe 3 c through the water-stopping material driving hose 11 from the lateral hole 3 c 1 formed in the vent pipe 3 c. Since the vent pipe 3c is made of a large diameter steel pipe having an inner diameter of about 2 m, when the water-stopping material C is dropped from the top to the bottom of the vent pipe 3c, the components of the water-stopping material C (for example concrete) In this case, gravel, etc.) will separate and may not solidify well. For this reason, in this embodiment, as shown in FIG. 3, the hose guide part 20 is provided in the water stop material placing instrument 10, and the water stop material placing hose 11 is inserted into the lateral hole 3c1 formed in the vent pipe 3c. Can be moved forward and backward.

  Specifically, the water stop material casting hose 11 is extended from the upper floor chamber 2b and the like, and is made to enter the inside of the vent pipe 3c, thereby shortening the distance to the bottom of the vent pipe 3c and preventing the water stop material C from dropping. Impact can be mitigated. As described above, in this embodiment, the water stop material placing hose 11 is held by the water stop material placing device 10 in an environment where an operator cannot approach, and the hose guide portion 20 places the water stop material C at a height of placement. By adjusting the thickness, the vent pipe 3c can be appropriately closed with the water-stopping material C without separating the components of the water-stopping material C by the impact at the time of dropping.

  Moreover, in this embodiment, the engagement fixing | fixed part 30 is provided in the water stop material placement instrument 10, and it engages with the horizontal hole 3c1, and the movement in the advancing / retreating direction in which the water stop material placement hose 11 advances / retreats is regulated. . Thus, by engaging the water stop material placing instrument 10 with the horizontal hole 3c1 and performing relative positioning, the hose guide portion 20 can guide the water stop material placing hose 11 appropriately. Moreover, detachment of the water stop material placing instrument 10 due to a reaction force received when placing the water stop material C can be prevented.

  When the water-stopping material placing hose 11 enters the inside of the vent pipe 3c and the water-stopping material C is placed to some extent, the water-stopping material placing hose 11 is gradually pulled up. Then, as shown in FIG. 3, the water stop material placing hose 11 is retracted to the outside of the vent pipe 3 c and the inside of the box-shaped housing part 40. In the present embodiment, the lateral hole 3c1 is closed outside the vent pipe 3c in order to close the horizontal hole 3c1 into which the water stop material placing hose 11 is inserted without separately closing the lateral hole 3c1 after completion of the water stopping material placement. Is surrounded by a box-shaped housing portion 40, and the lid of the horizontal hole 3c1 is formed of a water stop material C overflowed from the inside of the vent pipe 3c through the horizontal hole 3c1.

  The water stop material placing hose 11 is provided with a flange 12, and the hose guide portion 20 has a plate guide portion 23 having a guide hole 23 a having a diameter smaller than that of the flange 12. According to this configuration, when the water stop material placing hose 11 is retracted, the flange 12 comes into contact with the plate guide portion 23 and the guide hole 23 a provided in the plate guide portion 23 is closed. Moreover, the box-shaped housing | casing part 40 is provided with the pipe | tube contact part 41 which has a shape according to the external shape of the vent pipe 3c. According to this structure, the pipe contact part 41 can contact closely along the external shape of the vent pipe 3c. Therefore, the leakage of the water-stopping material C from the gap between the box-shaped housing portion 40 and the vent pipe 3c and the guide hole 23a is prevented, and the water-stopping material C is filled in the box-shaped housing portion 40 so that the horizontal hole 3c1 is filled. It is possible to reliably form a lid for closing the cover.

When the cooling water is flowing out to the vent pipe 3 c, the cooling water is accumulated inside the box-shaped housing unit 40. In the present embodiment, by providing the drainage portion 43 in the box-shaped housing portion 40, the water-stopping material C is filled in the box-shaped housing portion 40 while draining the cooling water from the inside of the box-shaped housing portion 40. be able to. As shown in FIG. 7 (b), the water draining portion 43 is arranged at the corner corner portion 40a (see FIG. 3) of the box-shaped housing portion 40 that becomes the highest when attached to the bent pipe 3c that extends obliquely. Therefore, the cooling water accumulated in the box-shaped casing 40 can be drained to the end.
As described above, by using the water-stopping material placing device 10, the vent pipe 3c can be appropriately closed with the water-stopping material C even in an environment where workers cannot approach.

  Thus, according to the above-described embodiment, the water stop material C for driving the water stop material C into the vent pipe 3c from the horizontal hole 3c1 formed in the vent pipe 3c via the water stop material driving hose 11 is provided. By adopting a configuration in which the water material placing device 10 has a hose guide portion 20 that advances and retracts the water stop material placing hose 11 with respect to the lateral hole 3c1, it is possible in an environment where workers cannot approach. However, since the placement height of the water-stopping material C can be adjusted, the vent pipe 3c can be appropriately closed with the water-stopping material C without separating the components of the water-stopping material C by the impact at the time of dropping. .

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, the present invention may adopt the forms shown in FIGS. 8 to 10 below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

FIG. 8 is a longitudinal sectional view showing a configuration of the engagement fixing portion 30a in another embodiment of the present invention.
As shown in FIG. 8, the engagement fixing portion 30a has a centering portion 50 for alignment with the lateral hole 3c1. The centering portion 50 is a triangular guide piece, and a plurality of centering portions 50 are provided on the peripheral surface of the lower end portion of the guide tube 22. The centering portion 50 is engaged with the horizontal hole 3c1, whereby the guide tube 22 (hose guide portion 20) is centered. According to this structure, even if the processing accuracy of the horizontal hole 3c1 is not high, the water-stopping material placing device 10 can be easily installed.

FIG. 9 is a longitudinal sectional view showing a configuration of the engagement fixing portion 30b in another embodiment of the present invention.
As shown in FIG. 9, the engagement fixing portion 30 b includes a fitting type hook 52. The hook 52 is rotatably provided on the peripheral surface of the lower end portion of the guide tube 22. The hook 52 has a substantially square shape with a barb 52a at the tip. The hook 52 is urged by a spring member 53 in the direction in which the tip end is opened. According to this configuration, since the structure is relatively simple, the reliability of the operation can be improved and the manufacturing cost can be reduced.

FIG. 10 is a longitudinal sectional view showing a configuration of the engagement fixing portion 30c in another embodiment of the present invention.
As shown in FIG. 10, the engagement fixing portion 30 c has a ball hook 54. The ball hook 54 is suspended by a wire 55. The ball hook 54 is disposed around the lower end portion of the guide tube 22, and is inserted into the lateral hole 3 c 1 as a wedge by pulling the wire 55. According to this configuration, not only the vertical direction but also the horizontal play can be reduced.

  Further, for example, in the above-described embodiment, the configuration in which the through hole 22a is formed in the guide tube 22 and the water-stopping material C is filled in the box-shaped housing portion 40 has been described, but the present invention is limited to this configuration. Instead, a configuration in which the lower end portion of the guide tube 22 is formed in a comb-like shape or a rod shape and the water-stopping material C is filled from the gap may be adopted.

  Further, for example, in the above-described embodiment, an example in which the present invention is applied to a method of flooding a MARK-I type reactor containment vessel, which is one of boiling water reactors, has been described. In addition, it can be used when placing a water-stopping material for a pipe to be closed.

  3c ... Vent pipe (pipe), 3c1 ... Horizontal hole, 10 ... Water stop material placing device, 11 ... Water stop material placing hose, 12 ... Flange, 20 ... Hose guide part, 23 ... Plate guide part, 23a ... Guide Hole: 30 ... engagement fixing part, 40 ... box-type housing part, 41 ... pipe contact part, 43 ... draining part, C ... water stop material

Claims (8)

A water stop material placing device for placing a water stop material into the inside of the pipe from a horizontal hole formed in the pipe via a water stop material placing hose,
A hose guide part for advancing and retracting the water stop material placing hose with respect to the lateral hole ;
An instrument for fixing a water-stopping material , which has an engagement fixing portion that engages with the lateral hole and restricts movement in the advancing and retreating direction in which the water-stopping material placing hose advances and retreats . It has a box-shaped housing portion that surrounds the lateral hole outside the tube and forms a lid of the lateral hole with the waterstop material overflowed from the inside of the tube through the lateral hole. The water-stopping material placing device according to claim 1 . A water stop material placing device for placing a water stop material into the inside of the pipe from a horizontal hole formed in the pipe via a water stop material placing hose,
A hose guide part for advancing and retracting the water stop material placing hose with respect to the lateral hole;
A box-shaped housing portion that surrounds the lateral hole outside the tube and forms a lid of the lateral hole with the water blocking material overflowed from the inside of the tube through the lateral hole. A water-stopping material placing device. The said water stop material placing hose advances / retreats between the inside of the said pipe | tube, and the exterior of the said pipe | tube, and the inside of the said box-type housing part, The Claim 2 or 3 characterized by the above-mentioned. Water stop device.   The said box-type housing | casing part is equipped with the pipe contact part which has a shape according to the external shape of the said pipe | tube, The water stop material placement instrument of Claim 4 characterized by the above-mentioned. The said box-type housing | casing part has a drain part which makes the inside and outside communicate, The water stop material placement instrument as described in any one of Claims 2-5 characterized by the above-mentioned. The water stop material placing hose is provided with a flange,
The said hose guide part is provided with the guide hole of a diameter smaller than the said flange, and has a board guide part which can contact the said flange when the said water stop material casting hose retracts, The 1st characterized by the above-mentioned. 7. The water stop material placing device according to any one of claims 6. A water stop material placing device for placing a water stop material into the inside of the pipe from a horizontal hole formed in the pipe via a water stop material placing hose,
A hose guide part for advancing and retracting the water stop material placing hose with respect to the lateral hole,
The water stop material placing hose is provided with a flange,
The hose guide portion has a guide hole having a diameter smaller than that of the flange, and has a plate guide portion that can come into contact with the flange when the water stop material placing hose is retracted. Equipment for installation.

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