JP2019157929A - Stopper-executed plug, stopper-executed plug applying/removing jig, stopper-executed plug fixing method, stopper-executed plug removing method and stopper-executed plug maintenance method - Google Patents

Abstract

To attain a stable seal performance and also improve working property.SOLUTION: A stopper-executed plug comprises: a plug main body 2 formed to have an outer shape extending along an inner surface of a stud hole 42d so as to be inserted into the stud hole 42d to which a plug is applied; a seal ring 3 formed in an annular shape along an outer circumference of the plug main body 2; and a concave side surface 2Ac acting as an abutting part arranged to be abutted against an inside part of the seal ring 3; and expanding/shrinking means 4 for supporting the seal ring 3 under a smaller reduced diameter state than that of the inner diameter of the stud hole 42d when the plug main body 2 is inserted into the stud hole 42d or when the plug main body 2 is removed from the stud hole 42d and in turn, expanding a diameter of the seal ring 3 under a state in which the plug main body 2 is inserted into the stud hole 42d and pushing it against the inner surface of the stud hole 42d.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a plug plug, a plug plug attachment / detachment tool, a plug plug attachment method, a plug plug removal method, and a plug plug maintenance method used for plugging openings in bolt holes, for example.

  During periodic inspections at nuclear power plants, the stud bolts of the reactor vessel are removed, the upper lid is removed from the trunk, and the cavity in which the reactor vessel is located is filled with water. In such a case, when water enters the stud hole where the stud bolt is fixed in the trunk portion of the reactor vessel, rust is generated in the screw portion of the stud hole. For this reason, the maintenance work which removes rust is needed.

  Therefore, it is necessary to protect the stud hole by preventing water from entering the stud hole, and the stud hole is plugged with a plug. In the conventional plug, an O-ring is attached around a cylindrical plug body that can be inserted into a stud hole, and the plug body is attached so that the O-ring is pressed against the inner surface of the stud hole by an elastic force. Installed by pushing into the stud hole. The plug body has a female threaded portion formed on the upper surface. The male threaded portion formed at the tip of the rod member of the attachment / detachment jig is screwed to the female threaded portion, and the plugging plug is attached to the stud hole. Or removing.

  By the way, for example, in Patent Document 1, as a water stop cock for piping work, an annular packing material having a C-shaped cross section is provided between a disk-shaped receiving plate and a disk-shaped pressing plate, Tightening means is provided at the center of the disk-shaped receiving plate and the disk-shaped pressing plate, and an inclined or curved surface that accepts the annular packing material is provided near the peripheral side of the disk-shaped receiving plate and the disk-shaped pressing plate. What is provided oppositely is disclosed. In other words, the water stop cock for piping work of Patent Document 1 obtains sealing performance by applying tightening compression by the tightening means to the annular packing material and utilizing the outward bulging action due to the bending phenomenon of the annular packing material. .

Japanese Utility Model Publication No. 52-156324

  A conventional plug for plugging a stud hole has a sealing performance by the elastic force of an O-ring, and is attached by pushing the plug body into the stud hole. For this reason, the air in a stud hole will be compressed at the time of attachment, and there exists a tendency for a stopper plug to float under influence of compressed air after attachment. After attaching the plug, there is an operation to apply a waterproof seal from the top of the plug on the flange surface of the reactor vessel body where the stud hole is formed. There is a risk of hindering the attachment. In addition, the conventional plug for plugging the stud hole obtains sealing performance by the elastic force of the O-ring, and the contact width of the O-ring to the inner surface of the stud hole is about 2 mm, so the inner surface of the stud hole is fine. If scratches are present, the sealing performance may be impaired. In addition, if the contact width of the O-ring is made larger in the conventional plug, the pressure contact pressure on the inner surface of the stud hole of the O-ring increases, so that a large pushing force is required when pushing the plug body into the stud hole, and Since the influence of the compressed air that the plug body floats increases, it is not desirable.

  Moreover, since the attachment / detachment jig according to the conventional plugging plug has a structure in which the male screw portion is screwed to the female screw portion of the plug main body, the operation of attaching / detaching the attachment / detachment jig to / from the plug main body is not easy. For this reason, since workability | operativity of the operation | work which attaches or removes a plugging plug to a stud hole is bad, and it takes time, it is not desirable as work in a radiation environment.

  Moreover, since the water stopcock of patent document 1 has the space formed in the inner side of the annular packing material, since the annular packing material deform | transforms toward an inner side, an outer bulging action becomes inadequate and sealing performance Cannot be secured. Therefore, the water stop cock of patent document 1 is not suitable as a plug for plugging a stud hole.

  The present invention solves the above-described problems, and provides a plug plug, a plug plug attachment / detachment jig, a plug plug attachment method, a plug plug removal method, and a seal that can obtain stable sealing performance and improve workability. It is an object of the present invention to provide a plugging plug maintenance method capable of easily maintaining a mechanism.

  In order to achieve the above-described object, a plug plug according to one aspect of the present invention includes a plug main body formed to have an outer shape along the inner surface of the hole so as to be inserted into a hole to be plugged, and the plug. A seal ring formed in an annular shape along the outer periphery of the main body, an abutting portion arranged to abut on the inner side of the seal ring, and when the plug main body is inserted into the hole or when the plug main body is inserted into the hole Expansion / contraction means for supporting the seal ring in a reduced diameter state smaller than the inner diameter of the hole when removing it from the hole, and expanding the seal ring in a state where the plug body is inserted into the hole and pressing the seal ring against the inner surface of the hole. .

  In the plug plug according to one aspect of the present invention, it is desirable that the plug body has a flat upper surface that appears on the opening side of the hole when inserted into the hole.

  Further, in the plug plug according to one aspect of the present invention, the plug body has an inner surface of the opening so that the flange surface on the opening side of the hole and the upper surface are at the same level when inserted into the hole. It is desirable to have a tapered surface that fits into the tapered surface.

  In the plug plug according to one aspect of the present invention, it is preferable that the seal ring has a flat surface on the outer peripheral surface in the reduced diameter state.

  In the plug plug according to one aspect of the present invention, it is desirable that the expansion / contraction means has a defining portion that defines the reduced diameter state and the expanded diameter state of the seal ring.

  In the plug plug according to one aspect of the present invention, it is preferable that the plug body has an indicator portion that can visually check whether the plug body is sealed by the seal ring.

  Further, in the plug plug according to one aspect of the present invention, the plug body has an upper surface that appears on the opening side of the hole and a hole bottom side surface that is disposed on the hole bottom side opposite to the upper surface. It is desirable to form it flat.

  In the plug plug according to one aspect of the present invention, it is preferable that the plug main body has a latching portion at a portion disposed on the bottom side of the hole.

  Further, in the plug plug according to one aspect of the present invention, the plug body includes a first member that appears on the opening side of the hole and a second member that is disposed on the hole bottom side in a state of being inserted into the hole. The seal ring is sandwiched between the first member and the second member, and the expansion / contraction means is arranged around an axis that penetrates the first member and the second member. A rotating shaft provided rotatably, and a moving portion that moves the first member and the second member relatively closer to and away from each other as the rotating shaft rotates. It is desirable to be fixed to either the member or the second member.

  Further, in the plug plug according to one aspect of the present invention, the rotating shaft and the first member each have facing surfaces that are orthogonal to the axial center and face each other, and between the facing surfaces, around the axial center. It is desirable to provide an O-ring arranged in an annular shape.

  Further, in the plug plug according to one aspect of the present invention, the expansion / contraction means has a stepped portion for preventing the first member from coming off on one end side of the rotating shaft, and the second portion on the other end side of the rotating shaft. It is desirable that a supporting member for preventing the member from being detached is fixed to the rotating shaft by a mounting bolt that can be attached and detached.

  In order to achieve the above-mentioned object, a plug plug attaching / detaching jig according to one aspect of the present invention includes a plug body formed to have an outer shape along the inner surface of the hole so as to be inserted into a hole to be plugged. A seal ring formed in an annular shape along the outer periphery of the plug body, an abutting portion arranged to contact the inside of the seal ring, and when the plug body is inserted into the hole or the plug body When removing from the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, while the diameter of the seal ring is increased and pressed against the inner surface of the hole while the plug body is inserted into the hole. A plug plug attaching / detaching jig comprising: an engagement portion that engages with the expansion / contraction means of the plug plug and holds the engagement state; and the expansion / contraction means is operated via the engagement portion. And an operation unit.

  Further, in the plug plug attaching / detaching jig according to one aspect of the present invention, the plug main body is inserted into the hole, and the second member is disposed on the hole bottom side with the first member appearing on the opening side of the hole. The seal ring is sandwiched and provided between the first member and the second member, and the expansion / contraction means has an axial center extending through the first member and the second member. A rotation shaft provided rotatably around the rotation shaft, and a moving unit that moves the first member and the second member relatively close to each other as the rotation shaft rotates. The engagement portion is engaged with the rotation shaft and the engagement state is maintained, and the operation portion is provided to be able to rotate the rotation shaft via the engagement portion, and the first rotation shaft is rotated by the operation portion. It is desirable to further include a restricting portion that restricts the rotation of the members.

  In order to achieve the above-described object, a plug plug attachment method according to one aspect of the present invention includes a plug body formed having an outer shape along the inner surface of the hole so as to be inserted into a hole to be plugged. A seal ring formed in an annular shape along the outer periphery of the plug body, an abutting portion arranged to contact the inside of the seal ring, and when the plug body is inserted into the hole or the plug body When removing from the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, while the diameter of the seal ring is increased and pressed against the inner surface of the hole while the plug body is inserted into the hole. Means, an engagement portion that engages with the expansion / contraction means of the plug plug and maintains the engagement state, and an operation portion that operates the expansion / contraction means via the engagement portion. The plug plug attachment / detachment jig provided, A plug plug attaching method to be used, in which the engagement portion is engaged with the expansion / contraction means and the engagement state is maintained and the closure body is moved together with the engagement portion to the hole, and the closure body is moved to the hole. In a state of being inserted into the hole, the operation portion is operated to expand the diameter of the seal ring and press the inner surface of the hole, and then the engagement portion is removed from the expansion / contraction means.

  In order to achieve the above-mentioned object, a plug plug removing method according to one aspect of the present invention includes a plug body formed having an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged. A seal ring formed in an annular shape along the outer periphery of the plug main body, a contact portion arranged to contact the inner side of the seal ring, and when the plug main body is inserted into the hole or the plug main body When the seal ring is removed from the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, while the seal ring is expanded in diameter and pressed against the inner surface of the hole while the plug body is inserted into the hole. A plug plug provided with expansion / contraction means, an engagement portion that engages with the expansion / contraction means of the plug plug and maintains the engagement state, and an operation unit that operates the expansion / contraction means via the engagement portion; Plugging plug attaching / detaching jig comprising, A plug plug removing method to be used, wherein the engagement portion is engaged with the expansion / contraction means from a state in which the plug body is inserted into the hole to expand the diameter of the seal ring and press against the inner surface of the hole. After the operation portion is operated and the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole in a form in which the combined state is maintained, the plug body is removed from the hole together with the engagement portion, and then The engaging portion is removed from the expansion / contraction means.

  In order to achieve the above-described object, a plug plug maintenance method according to one aspect of the present invention includes a plug body formed to have an outer shape along the inner surface of the hole so as to be inserted into a hole to be plugged. A seal ring formed in an annular shape along the outer periphery of the plug body, an abutting portion arranged to contact the inside of the seal ring, and when the plug body is inserted into the hole or the plug body When removing from the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, while the diameter of the seal ring is increased and pressed against the inner surface of the hole while the plug body is inserted into the hole. And the plug body includes a first member that appears on the opening side of the hole and a second member that is disposed on the bottom side of the hole in the state inserted into the hole, and the seal ring The first member and the first member The expansion / contraction means is provided between a rotating shaft provided to be rotatable around an axis passing through the first member and the second member, and with the rotation of the rotating shaft. A moving part that relatively moves the first member and the second member toward and away from each other, and the expansion / contraction means has a stepped part that prevents the first member from coming off at one end side of the rotating shaft. A plug plug maintenance method in which a support member that prevents the second member from coming off at the other end side of the rotating shaft is fixed by a mounting bolt that can be attached to and detached from the rotating shaft. After removing the mounting bolt and the support member, removing the second member from the rotating shaft and replacing the seal ring, the second member is mounted on the rotating shaft, and the supporting member and the mounting bolt are mounted on the rotating shaft. Install.

  Further, in the plug plug maintenance method according to one aspect of the present invention, the rotating shaft and the first member each have facing surfaces that are orthogonal to the axial center and face each other, and the axial center between the facing surfaces. An O-ring arranged in an annular shape is provided around the rotary shaft, the mounting bolt and the support member are removed from the rotary shaft, the second member is removed from the rotary shaft, the seal ring is removed, and the rotary shaft is removed. The first member is removed, the O-ring is removed, the O-ring is replaced, the first member is attached to the rotating shaft, the seal ring is replaced, the second member is attached to the rotating shaft, and the rotating shaft is attached. It is desirable to attach the support member and the mounting bolt.

  According to the present invention, when the plug main body is inserted into the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, and the seal ring is expanded with the plug main body inserted into the hole. Since it is pressed against the inner surface of the hole, the air in the hole is not compressed at the time of attachment as in the case of a conventional plug plug, and it is possible to prevent the plug plug from being lifted by the influence of the compressed air after the attachment. In addition, since the contact portion contacts the inside of the seal ring, it is possible to prevent the seal ring from deforming inward when the diameter of the seal ring is increased. Therefore, it is possible to suppress the intrusion of water into the hole, and the maintenance work by this can be simplified. As a result, stable sealing performance can be obtained and workability can be improved.

FIG. 1 is a schematic configuration diagram of a nuclear power plant to which a plug plug according to an embodiment of the present invention is applied. FIG. 2 is a longitudinal cross-sectional view of a pressurized water reactor to which a plug plug according to an embodiment of the present invention is applied. FIG. 3 is a vertical cross-sectional view of the plug plug according to the embodiment of the present invention. FIG. 4 is a plan view of the plug plug according to the embodiment of the present invention. FIG. 5 is a bottom view of the plug plug according to the embodiment of the present invention. FIG. 6 is a longitudinal sectional view showing an operation diagram of the stopper plug according to the embodiment of the present invention. FIG. 7 is a plan view showing an operation diagram of the stopper plug according to the embodiment of the present invention. FIG. 8 is an exploded longitudinal sectional view of the plug plug according to the embodiment of the present invention. FIG. 9 is a perspective view of the plug plug attaching / detaching jig according to the embodiment of the present invention. FIG. 10 is a partially enlarged perspective view of the plug plug attaching / detaching jig according to the embodiment of the present invention. FIG. 11 is a perspective view illustrating a plug plug attaching method according to an embodiment of the present invention. FIG. 12 is a perspective view illustrating a plug plug attaching method according to an embodiment of the present invention. FIG. 13 is a perspective view illustrating a plug plug attaching method according to an embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

FIG. 1 is a schematic configuration diagram of a nuclear power plant to which a plug plug according to the present embodiment is applied. FIG. 2 is a longitudinal sectional view of a pressurized water nuclear reactor to which the plug plug according to the present embodiment is applied.
The nuclear reactor applied to the nuclear power plant of the present embodiment uses light water as a reactor coolant and a neutron moderator to produce high-temperature and high-pressure water that does not boil over the entire primary system, and sends this high-temperature and high-pressure water to a steam generator. This is a pressurized water reactor (PWR) that generates steam by heat exchange and sends the steam to a turbine generator to generate electricity.

  As shown in FIG. 1, the reactor containment vessel 11 stores therein a pressurized water reactor 12 and a steam generator 13. The pressurized water reactor 12 and the steam generator 13 are connected via cooling water pipes 14 and 15. The cooling water pipe 14 is provided with a pressurizer 16. The cooling water pipe 15 is provided with a primary coolant circulation pump 17. Accordingly, in the pressurized water reactor 12, light water is heated as a primary coolant by the fuel constituting the core, and the steam generator 13 is passed through the cooling water pipe 14 in a state where the high temperature light water is maintained at a predetermined high pressure by the pressurizer 16. Sent to. In the steam generator 13, heat exchange is performed between the high-temperature and high-pressure light water (primary coolant) and the secondary coolant, and the cooled light water is supplied to the pressurized water type through the cooling water pipe 15 by the primary coolant circulation pump 17. Returned to reactor 12.

  The steam generator 13 is connected to a steam turbine 18 and a condenser 19 provided outside the reactor containment vessel 11 via cooling water pipes 20 and 21. The cooling water pipe 21 is provided with a water supply pump 22. The steam turbine 18 is connected to a generator 23. The condenser 19 is connected to a water intake pipe 24 and a drain pipe 25 that supply and discharge cooling water (for example, seawater). Accordingly, the steam generated by exchanging heat with the high-pressure and high-temperature primary cooling water in the steam generator 13 is sent to the steam turbine 18 through the cooling water pipe 20, and the steam turbine 18 is driven by this steam to generate power. Electric power is generated by the machine 23. The steam that has driven the steam turbine 18 is cooled by the condenser 19 and then returned to the steam generator 13 through the cooling water pipe 21.

  Further, in the pressurized water reactor 12, as shown in FIG. 2, the reactor vessel 41 has a reactor vessel main body 42 and an upper lid 43 attached to the upper portion thereof so that the in-reactor structure can be inserted therein. It is configured. The reactor vessel body 42 is fixed in the cavity of the reactor containment vessel 11 and has a cylindrical shape in which an opening 42a is formed at the upper end and the lower end is closed by a lower mirror 42b having a spherical shape. The upper lid 43 is fixed to the reactor vessel main body 42 by a plurality of stud bolts 44 and nuts 45 arranged along a cylindrical shape, and the opening 42 a of the reactor vessel main body 42 is removed by attaching and detaching the stud bolts 44 and nuts 45. It can be opened and closed.

  The reactor vessel main body 42 is formed with an inlet nozzle (inlet nozzle) 47 for supplying light water (coolant) as primary cooling water and an outlet nozzle (exit nozzle) 48 for discharging light water. The reactor vessel main body 42 has a reactor internal structure inserted therein.

  The in-furnace structure will be described. An upper core support plate 49 is fixed above the inlet nozzle 47 and the outlet nozzle 48, while a lower core support plate 50 is fixed near the lower mirror 46 below. The upper core support plate 49 is connected to the upper core plate 52 downward via a plurality of core support rods 51. A cylindrical reactor core 53 having a predetermined clearance from the inner wall surface of the reactor vessel main body 42 is disposed. The core tank 53 has an upper core plate 52 connected to the upper part and a lower core plate 54 connected to the lower part. The lower core plate 54 is supported by the lower core support plate 50. A core 55 is formed by the upper core plate 52, the core tank 53, and the lower core plate 54. A large number of fuel assemblies 56 are arranged inside the core 55. The core 55 has a large number of control rods 57 disposed therein. A large number of control rods 57 are combined at the upper ends into a control rod cluster 58 that can be inserted into the fuel assembly 56. The upper core support plate 49 penetrates through the upper core support plate 49 itself, and a number of control rod cluster guide tubes 59 are fixed. Each control rod cluster guide tube 59 has a lower end extending to the control rod cluster 58 in the fuel assembly 56.

  The upper lid 43 constituting the nuclear reactor vessel 41 is provided with a control jack driving device 60 of a magnetic jack on the upper part. The upper ends of the control rod cluster guide tubes 59 described above are extended to the control rod driving device 60. In the control rod drive device 60, the control rod cluster drive shaft 62 extends through the control rod cluster guide tube 59 to the fuel assembly 56 so that the control rod cluster 58 can be gripped. The control rod drive device 60 controls the output of the nuclear reactor by moving the control rod cluster drive shaft 62 up and down.

  Accordingly, the control rod cluster drive shaft 62 is moved by the control rod drive device 60 and the control rod 57 is inserted into the fuel assembly 56, thereby controlling the nuclear fission in the reactor core 55 and the generated thermal energy to the reactor vessel. The light water filled in 41 is heated, and high-temperature light water is discharged from the outlet nozzle 48 and sent to the steam generator 13 as described above. That is, the nuclear fuel constituting the fuel assembly 56 is fissioned to release neutrons, and the light water as the moderator and the primary cooling water reduces the kinetic energy of the released fast neutrons to become thermal neutrons, and new It is easy to cause nuclear fission and takes away the generated heat to cool. Further, by inserting the control rod 57 into the fuel assembly 56, the number of neutrons generated in the core 55 is adjusted, and the control rod 57 is rapidly inserted into the core 55 when the reactor is urgently stopped.

  As described above, in the reactor vessel 41, the reactor vessel main body 42 and the upper lid 43 are detachably mounted on the upper portion of the reactor vessel main body 42 by the plurality of stud bolts 44 and nuts 45. The stud bolt 44 has a lower screw portion 44a, a central through portion 44b, and an upper screw portion 44c. The stud bolt 44 is formed by screwing the lower screw portion 44a into a stud hole 42d, which is a screw hole formed in a flange surface 42c facing the periphery of the opening portion 42a of the reactor vessel main body 42 and facing upward. 42 is fixed. Further, the stud bolt 44 has a through portion 44b that passes through a mounting hole 43a formed in the upper lid 43 of the reactor vessel 41, and an upper screw portion 44c projects upward from the mounting hole 43a. Then, the nut 45 can be fastened or loosened by screwing the nut 45 while applying a pressure to the stud bolt 44 upwardly away from the reactor vessel main body 42. On the other hand, the upper lid 43 can be attached and detached.

  FIG. 3 is a longitudinal sectional view of the plug plug according to this embodiment. FIG. 4 is a plan view of the plug plug according to the present embodiment. FIG. 5 is a bottom view of the plug plug according to the present embodiment. FIG. 6 is a longitudinal sectional view showing an operation diagram of the plug plug according to the present embodiment. FIG. 7 is a plan view showing an operation diagram of the stopper plug according to the present embodiment. FIG. 8 is an exploded longitudinal sectional view of the stopper plug according to the present embodiment.

  The plug of the present embodiment prevents water from entering the stud hole 42d when the upper lid 43 is removed from the reactor vessel main body 42 of the reactor vessel 41 during the periodic inspection of the nuclear power plant described above. It is used to block the opening of the stud hole 42d. As shown in FIGS. 3 to 8, the plug 1 includes a plug body 2, a seal ring 3, and expansion / contraction means 4.

  As shown in FIG. 3, the plug body 2 has an outer shape along the inner surface of the stud hole 42d so that the stud hole 42d, which is a hole to be plugged, is also inserted. Specifically, the stud hole 42d is formed as a circular hole having a circular opening, and the plug body 2 has a circular outer shape as shown in FIGS.

  The plug body 2 includes a first member 2A that appears on the opening side of the stud hole 42d and a second member 2B that is arranged on the bottom side of the stud hole 42d in a state of being inserted into the stud hole 42d. The stud hole 42d is formed so that the opening portion opens upward and has a bottom portion below. In the plug body 2, the first member 2A is configured as an upper plug, and the second member 2B is configured as a lower plug. Has been.

  The first member 2A is formed in a disc shape. In the first member 2A, the outermost surface 2Aa that appears on the opening side of the stud hole 42d when it is inserted into the stud hole 42d is formed flat. The surface 2Aa of the first member 2A is the surface that is the outermost surface (upper surface) in the plugging plug 1 and has the largest area as the surface on the front side of the first member 2A. Accordingly, the surface 2Aa (the upper surface of the plug 1) of the first member 2A is the same level as the flat portion (flange surface) 42da at the periphery of the opening of the stud hole 42d in a state of being inserted into the stud hole 42d. Can be.

  The first member 2A has an outermost side surface 2Ab facing the inner surface of the stud hole 42d in a state where the first member 2A is inserted into the stud hole 42d. Thus, a tapered surface that gradually spreads upward is formed. In the stud hole 42d, a tapered surface that gradually widens upward (in the opening direction) is formed on the inner surface 42db of the opening. The side surface 2Ab of the first member 2A is formed as a tapered surface, and is formed such that the tapered surfaces are fitted to the inner surface 42db of the opening of the stud hole 42d. Then, when the mutually tapered surfaces (the side surface 2Ab of the first member 2A and the inner surface 42db of the opening of the stud hole 42d) are fitted, the surface 2Aa of the first member 2A (the upper surface of the plugging plug 1) is the surface of the stud hole 42d. The state which became the same level as the flat part (flange surface) 42da of the periphery of an opening part can be maintained.

  Further, the first member 2A is formed in a cylindrical shape in which a portion below the side surface 2Ab extends downward and is continuously annular. And the said cylindrical part is dented and formed inward rather than side surface 2Ab, and concave side surface 2Ac continued cyclically | annularly toward the outer side is formed. The concave side surface 2Ac is a surface that faces the inner surface of the stud hole 42d when the first member 2A is inserted into the stud hole 42d, and is provided as a contact portion that contacts the inner side of the seal ring 3. Further, in the first member 2A, the stepped portion in which the cylindrical portion is recessed inward on the lower side than the side surface 2Ab is formed with a receiving surface 2Ad that is continuous in an annular shape toward the lower side. The receiving surface 2Ad forms a tapered surface that gradually spreads upward from the upper end of the concave side surface 2Ac. The receiving surface 2Ad is provided as a support portion that indicates the upper surface of the seal ring 3.

  The second member 2B is formed in a disc shape. In the second member 2B, the innermost inner surface 2Ba disposed on the bottom side of the stud hole 42d in a state of being inserted into the stud hole 42d is formed flat. The second member 2B is formed in a cylindrical shape whose outer edge extends upward and continues in an annular shape. And the said cylindrical part is formed smaller diameter than the inner surface of the stud hole 42d, and is arrange | positioned along the concave side surface 2Ac in the outer side of the cylindrical part of 2 A of 1st members. The upper end of the cylindrical portion of the second member 2B is formed with a receiving surface 2Bb that is continuous in an annular shape toward the upper side. The receiving surface 2Bb forms a tapered surface that gradually expands downward toward the outside. The receiving surface 2Bb is provided as a support portion that indicates the lower surface of the seal ring 3.

  The seal ring 3 is made of silicon rubber or the like and is formed in an annular shape. The seal ring 3 is disposed outside the cylindrical portion of the first member 2A. The seal ring 3 has an inner surface 3a that comes into contact with the concave side surface 2Ac on the outer side of the cylindrical portion of the first member 2A. Further, the seal ring 3 is formed with a concave portion 3b that is continuous in an annular shape on the inner surface 3a. Further, the seal ring 3 has an upper surface 3c that forms a tapered surface that is annularly continuous along the receiving surface 2Ad of the first member 2A and gradually expands upward toward the outside. Further, the seal ring 3 has a lower surface 3d that forms a tapered surface that is annularly continuous along the receiving surface 2Bb of the second member 2B and gradually expands downward toward the outside. Further, the seal ring 3 has an outer diameter in which the outer peripheral surface 3e is not in contact with the inner surface of the stud hole 42d in a state in which no compressive force is applied from the outside (a reduced diameter state in which the compressive force is minimal from the outside). The outer peripheral surface 3e has a flat surface. The flat surface referred to here is not limited to a flat surface but includes a gently curved surface that bulges outward to the extent that it approximates to a flat surface.

  The expansion / contraction means 4 supports the seal ring 3 in a reduced diameter state smaller than the inner diameter of the stud hole 42d when inserting the plug body 2 into the stud hole 42d or when removing the plug body 2 from the stud hole 42d. In the state where 2 is inserted into the stud hole 42d, the diameter of the seal ring 3 is expanded and pressed against the inner surface of the stud hole 42d.

  In the present embodiment, the expansion / contraction means 4 separates the first member 2A and the second member 2B forming the plug body 2 from each other, thereby forming the receiving surface 2Ad of the first member 2A and the receiving surface 2Bb of the second member 2B. By separating and minimizing the external compression force to the seal ring 3 disposed between the receiving surfaces 2Ad and 2Bb, the seal ring 3 is moved to the stud hole 42d by the free elastic force of the seal ring 3 itself. The diameter is reduced to be smaller than the inner diameter, and is supported in this reduced diameter state. On the other hand, the expansion / contraction means 4 brings the receiving surface 2Ad of the first member 2A and the receiving surface 2Bb of the second member 2B closer by bringing the first member 2A and the second member 2B forming the plug body 2 closer to each other. Applying compressive force to the seal ring 3 disposed between the receiving surfaces 2Ad and 2Bb while restricting the inward movement of the seal ring 3 with the concave side surface 2Ac outside the cylindrical portion of the first member 2A. Thus, the seal ring 3 is expanded larger than the inner diameter of the stud hole 42d against the elastic force of the seal ring 3, and the outer peripheral surface 3e of the seal ring 3 is pressed against the inner surface of the stud hole 42d.

  The expansion / contraction means 4 having such an action includes a rotating shaft 4A, a support member 4B, a mounting bolt 4C, a fixing pin 4D, an O-ring 4E, a defining portion 4F, and an indicator portion 4G.

  The rotating shaft 4A is provided so as to be able to rotate around an axis C passing through the first member 2A and the second member 2B at the center of the mutual disk shape and penetrating at the center of the mutual disk shape. Specifically, the rotation shaft 4A includes a rotation shaft portion 4Aa, a male screw portion 4Ab, and a head portion 4Ac. The rotating shaft 4A is rotatably inserted into a through hole 2Ae formed in the first member 2A. The male screw portion 4Ab is integrally formed with the rotary shaft portion 4Aa and is screwed into a female screw hole 2Bc formed in the second member 2B. The male screw portion 4Ab and the female screw hole 2Bc that are screwed together are configured as a moving portion that relatively moves the first member 2A and the second member 2B closer to and away from each other as the rotating shaft 4A rotates. The head portion 4Ac is formed integrally with the rotary shaft portion 4Aa on the side opposite to the male screw portion 4Ab in the extending direction of the axis C. Further, the head 4Ac is formed in a columnar shape having a larger diameter than the rotation shaft portion 4Aa and constitutes a step portion that prevents the first member 2A from coming off. The head 4Ac is accommodated in a recess 2Af formed to be recessed in the center of the disk shape on the surface 2Aa of the first member 2A. The through hole 2Ae of the first member 2A is formed so as to penetrate the bottom surface of the recess 2Af, and the head 4Ac is in contact with the bottom surface of the recess 2Af so as to penetrate the rotary shaft portion 4Aa through the through hole 2Ae. Support with. The head 4Ac is provided with an operation pin 4Ad projecting from the outer periphery thereof. The operation pins 4Ad are provided at four positions at intervals of 90 degrees around the axis C on the outer periphery of the head 4Ac. Then, by operating the operation pin 4Ad, the rotation shaft portion 4Aa of the rotation shaft 4A is rotated around the axis C, and the first member 2A and the second member 2B are engaged by screwing the male screw portion 4Ab and the female screw hole 2Bc. Can be moved relatively close to each other.

  The support member 4B is attached to a rotation shaft 4A (a tip portion of the male screw portion 4Ab) penetrating the second member 2B, and supports the rotation shaft 4A from coming off from the second member 2B. The mounting bolt 4C is provided as a single unit on the shaft center C, and fixes the support member 4B to the rotating shaft 4A in a detachable manner.

  The support member 4B is formed in a disk shape having a flat upper surface 4Ba along the flat inner surface 2Ba in the second member 2B and a flat lower surface 4Bb. The lower surface 4Bb of the support member 4B is an innermost surface disposed on the bottom side of the stud hole 42d in the plugging plug 1, and is a surface having a maximum area as a surface facing the bottom side of the stud hole 42d. Further, the support member 4B includes a fitting recess 4Bd in which a receiving recess 4Bc in which the head 4Ca of the mounting bolt 4C is received and a fitting protrusion 4Ae formed on the tip of the male screw portion 4Ab of the rotating shaft 4A are fitted. And have. For this reason, as for support member 4B, head 4Ca of mounting bolt 4C does not protrude from undersurface 4Bb. In addition, the support member 4B is restricted from rotating relative to the rotation shaft 4A around the mounting bolt 4C by fitting the fitting recess 4Bd into the fitting protrusion 4Ae. Further, the support member 4B is formed with a plurality of through holes 4Be. The through holes 4Be are circular in the present embodiment, and are provided at four positions with an interval of 90 degrees around the axis C. In addition, the support member 4B is provided so as to be recessed from the upper surface 4Ba between the through holes 4Be, thereby forming a latching portion 4Bf that is always formed away from the inner surface 2Ba of the second member 2B and can be hooked with a hook or the like. ing.

  The fixing pin 4D is provided to extend in parallel with the axis C toward the first member 2A in the second member 2B. The fixing pin 4D is inserted so as to be movable in the extending direction with respect to the hole 2Ag provided in the first member 2A. Accordingly, the fixing pin 4D is inserted into the hole 2Ag, while allowing the first member 2A and the second member 2B to move along the extending direction of the axis C, while the first member 2A and the second member 2D. 2B is restricted from rotating relatively around the axis C. Note that the fixing pin 4D may be provided in the first member 2A or may be inserted into a hole formed in the second member 2B.

  The O-ring 4E is fitted into an annular groove 2Ah formed in an annular shape around the axis C at the bottom surface of the recess 2Af of the first member 2A. The O-ring 4E is sandwiched between the head 4Ac of the rotating shaft 4A facing each other and the bottom surface of the recess 2Af of the first member 2A, thereby obtaining sealing performance therebetween.

  The defining portion 4F defines the reduced diameter state and the expanded diameter state of the seal ring 3. The reduced diameter state of the seal ring 3 is a state in which the seal ring 3 is freely reduced in diameter by its own elastic force and is smaller than the inner diameter of the stud hole 42d, and the outer peripheral surface 3e is formed on the inner surface of the stud hole 42d. This is a state where the outer diameter is not in contact. The diameter of the seal ring 3 is increased by compressing the seal ring 3 from the outside and resisting its own elastic force so as to be larger than the inner diameter of the stud hole 42d, and the outer peripheral surface 3e is the inner surface of the stud hole 42d. It is in a state where it is pressed against. In this embodiment, the defining portion 4F defines the reduced diameter state and the expanded diameter state of the seal ring 3 by defining the approach and separation between the first member 2A and the second member 2B. Specifically, as shown in FIG. 6, the defining portion 4F defines the approach (expanded diameter state) between the first member 2A and the second member 2B, so that the first member 2A and the second member 2B are Abutting portions (surfaces) 2Ai and 2Bi that are arranged to face each other and abut against each other are provided. Further, as shown in FIG. 3, the defining portion 4F defines the separation (diameter state) between the first member 2A and the second member 2B, and therefore the inner surface 2Ba of the second member 2B and the upper surface of the support member 4B. 4Ba is provided so as to abut against it.

  The indicator part 4G marks whether or not the seal part 3 is sealed. In the present embodiment, as shown in FIGS. 4 and 7, the indicator portion 4G has a mark (for example, knurling) on one of the operation pins 4Ad of the rotating shaft 4A. Further, as shown in FIGS. 3, 4, 6 and 7, the index portion 4G is linearly formed on the surface of the rotating shaft 4A in the radial direction from the axis C toward the operation pin 4Ad marked. One extending groove 4Af is formed. In addition, as shown in FIGS. 4 and 7, the index portion 4G has a predetermined angle range centered on the axis C by two grooves 2Aj on the surface 2Aa of the first member 2A. Then, as shown in FIG. 7, the state in which the operation pin 4Ad and the groove 4Af marked between the two grooves 2Aj are positioned is such that the first member 2A and the second member 2B approach each other. This indicates that the abutting portions (surfaces) 2Ai and 2Bi that are the defining portions 4F are in contact with each other, and the outer peripheral surface 3e of the seal ring 3 is pressed against the inner surface of the stud hole 42d and sealed. That is, the indicator part 4G can visually check whether or not the seal part 3 is sealed. Note that at least one of the mark of the operation pin 4Ad and the groove 4Af is sufficient.

  The expansion / contraction means 4 is not limited to the above configuration. For example, the stopper main body 2 is not composed of the first member 2A and the second member 2B, and the seal ring 3 is expanded from the inner side by expanding the diameter of the seal ring 3 from the inside, while the pressing force of the abutting portion is loosened and sealed. A mechanism (cam mechanism or actuator mechanism) that reduces the diameter by the elastic force of the ring 3 itself may be used.

  As shown in FIG. 8, the plug 1 shown in FIGS. 3 to 8 can be removed from the first member 2A, the second member 2B, and the support member 4B simply by removing the mounting bolt 4C from the rotation shaft 4A. Since it can be removed, the first member 2A, the second member 2B, the seal ring 3, the support member 4B, and the O-ring 4E can be separated.

  FIG. 9 is a perspective view of the plug plug attaching / detaching jig according to the present embodiment. FIG. 10 is a partially enlarged perspective view of the plug plug attaching / detaching jig according to the present embodiment. FIG. 11 is a perspective view showing a plug plug attaching method according to the present embodiment. FIG. 12 is a perspective view illustrating a plug plug attaching method according to the present embodiment. FIG. 13 is a perspective view illustrating a plug plug attaching method according to the present embodiment.

  As shown in FIG. 9, the plug plug attaching / detaching jig of the present embodiment includes a rotation restricting jig (regulator) 5 and a rotation operation jig 6.

  In the plug 1 described above, as shown in FIG. 3, the side surface 2Ab of the first member 2A and the inner surface 42db of the opening of the stud hole 42d are formed so that their tapered surfaces fit each other. . And in order to prevent the rust of side surface 2Ab of this 1st member 2A, a rust preventive agent (for example, silicone grease) is apply | coated to side surface 2Ab. Then, when the diameter of the seal ring 3 is increased, the rotary shaft 4A is rotated by the rotary operation jig 6 via the operation pin 4Ad. At this time, a lubricating action is caused in which the rust preventive agent rotates the first member 2A. Therefore, when the rotation shaft 4A is rotated to expand the diameter of the seal ring 3, the rotation restriction jig 5 restricts the rotation of the first member 2A.

  As shown in FIG. 9, the rotation restricting jig 5 includes a restricting portion main body 5A, a locking pin 5B, a rotation preventing portion 5C, and a tilt preventing portion 5D, and when the plug 1 is attached to the stud hole 42d. As shown in FIG. 12, the reactor vessel 42 is disposed along the upper surface and the side surface of the upper lid 43. In the restricting portion main body 5A, a steel material is formed in a cylindrical shape so that the upper and lower sides are opened so that the rotation operation jig 6 can be inserted. The restriction portion main body 5A is formed with a plurality of cut holes 5Aa in a cylindrical side portion so that the weight of the rotation restriction jig 5 is reduced as a whole. The locking pin 5B is provided at the cylindrical tip of the restricting portion main body 5A, is provided to protrude from the tip, and is provided with at least two. The anti-rotation portion 5C is a steel material formed in an L shape with its tip bent downward while extending from the upper portion of the restricting portion main body 5A to the outside in the cylindrical radial direction. The tilt prevention portion 5D is in a plurality of directions (four directions in the present embodiment) opposite to the cylindrical radial outer side of the restriction portion main body 5A at a position above the restriction portion main body 5A and below the rotation prevention portion 5C. It is something that protrudes. The tilt preventing portion 5D is provided with urethane rubber around a bolt (not shown) protruding outward in the cylindrical radial direction of the restricting portion main body 5A. As shown in FIGS. 11 and 12, when the plugging plug 1 is attached to the stud hole 42d, the rotation restricting jig 5 is inserted into the attachment hole 43a formed in the upper lid 43 of the reactor vessel 41 except for the rotation preventing portion 5C. At this time, the tilt prevention portion 5D contacts the inner surface of the mounting hole 43a, thereby preventing the rotation restricting jig 5 from tilting obliquely inside the mounting hole 43a. In contrast to the rotation restricting jig 5, the first member 2A of the plug body 2 in the plug plug 1 is formed with a locking hole 2Ak on the surface 2Aa for locking the locking pin 5B. With the locking pin 5B inserted into the locking hole 2Ak of the first member 2A and locked, the rotation operation jig 6 is rotated. At that time, if the stopper body 2 is rotated along with the rotation operation of the rotation operation jig 6, the rotation operation of the rotation prevention unit 5 </ b> C is restricted by the corner portion 43 b of the upper lid 43, and thereafter the rotation operation control is performed. The rotation of the plug body 2 accompanying the rotation operation of the tool 6 can be restricted, and only the rotating shaft 4A of the expansion / contraction means 4 can be rotated.

  As shown in FIG. 9, the rotary operation jig 6 includes an operation unit main body 6A, an operation rod (operation unit) 6B, and an operation handle 6C. As shown in FIG. 10, the operation unit main body 6 </ b> A is formed in a cylindrical shape with the lower part opened and the upper part closed. The operation portion main body 6A has a cylindrical shape and has an outer diameter that can be inserted into the recess 2Af of the first member 2A of the plug plug 1 described above, and the head portion 4Ac of the rotating shaft 4A of the expansion / contraction means 4 is inserted. It has an inner diameter that can be Further, the operating portion main body 6A is formed with an engaging groove (engaging portion) 6Aa that engages with the operating pin 4Ad of the rotating shaft 4A of the expansion / contraction means 4 at the lower open edge. The number of engagement grooves 6Aa is provided according to each operation pin 4Ad (four in the present embodiment). The engaging groove 6Aa is a groove that opens downward so as to cover the operation pin 4Ad from above when the operation portion main body 6A is moved downward, and pushes the operation pin 4Ad both around the axis C to rotate it. In order to be able to rotate 4A, it has engagement edge 6Aaa which faces both directions around the axis C. Further, the first member 2A and the second member 2B are relatively separated from each other, and the seal ring 3 is rotated in the rotation direction (the direction of arrow R1 in FIG. 10) of the rotation shaft 4A for reducing the diameter of the seal ring 3 by its own elastic force. A hook portion (engagement portion) 6Aab that is inserted below the operation pin 4Ad and maintains the engagement state of the engagement groove 6Aa is provided on the engagement edge 6Aaa on the side that rotates the shaft 4A.

  As shown in FIG. 9, the operation rod 6 </ b> B is provided to extend upward from the center of the cylindrical shape on the closed upper surface of the operation unit main body 6 </ b> A. As shown in FIG. 9, in the present embodiment, the operation handle 6C is provided to extend on both sides at the upper end of the operation rod 6B. The operator grips the operation handle 6C by hand and rotates the operation rod 6B together with the operation portion main body 6A. Therefore, the form is not particularly limited.

  Here, a procedure for attaching / detaching the plug plug 1 to / from the stud hole 42d using the plug plug attaching / detaching jig described above will be described.

  In the connection of the plugging plug attaching / detaching jig to the plugging plug 1, as shown in FIG. 9, first, the operator lifts and moves the restricting body 5 </ b> A of the rotation restricting jig 5, and the locking pin 5 </ b> B is plugged in the plugging plug 1. The main body 2 is inserted into the locking hole 2Ak of the first member 2A. Next, the operator grasps the operation rod 6B of the rotation operation jig 6 with his hand and lifts and moves the operation rod 6B, and inserts the operation rod 6B together with the operation portion main body 6A into the restriction portion main body 5A of the rotation restriction jig 5 from above. Then, the engaging groove 6 </ b> Aa of the operating portion main body 6 </ b> A is engaged with the operating pin 4 </ b> Ad of the rotating shaft 4 </ b> A in the plugging plug 1. At this time, as shown in FIG. 10, the first member 2A and the second member 2B are relatively separated from each other, and the rotation direction of the rotation shaft 4A (arrow) for reducing the diameter of the seal ring 3 by its own elastic force. The hook portion 6Aab is inserted below the operation pin 4Ad by rotating the operation portion main body 6A via the operation rod 6B in the R1 direction). Thereby, hook part 6Aab is hooked on operation pin 4Ad, and plugging plug 1 can be lifted via operation pin 4Ad by rotation operation jig 6. The rotation restriction jig 5 is lifted together with the rotation operation jig 6.

  On the other hand, the stud hole 42d is opened with the stud bolt 44 removed and the upper lid 43 remaining as shown in FIG. Then, the plug 1 is inserted through the rotation operation jig 6 together with the rotation restricting jig 5 from the mounting hole 43a of the upper lid 43 through which the stud bolt 44 is inserted, and the plug 1 is installed in the stud hole 42d.

  Next, when the operator hooks the rotation preventing portion 5C of the rotation restricting jig 5 on the corner 43b of the upper lid 43 of the reactor vessel 41, the rotation restricting jig 5 itself and the plug plug 1 associated with the rotation operation of the rotation operating jig 6 are connected. While regulating the rotation, as shown in FIG. 13, the operation rod 6B of the rotation operation jig 6 is grasped by hand and the operation rod 6B is rotated together with the operation portion main body 6A. The rotation direction of the operation portion main body 6A is the rotation direction (arrow R2 direction) of the rotation shaft 4A for causing the first member 2A and the second member 2B to relatively approach each other to expand the diameter of the seal ring 3. Then, as shown in FIG. 6, when the rotating shaft 4A is rotated until the abutting portions (surfaces) 2Ai and 2Bi, which are the mutual defining portions 4F of the first member 2A and the second member 2B, abut the seal ring 3 A diameter-expanded state comes into contact with the inner surface of the stud hole 42d. At this time, the work supervisor visually confirms that the operation pin 4Ad constituting the index portion 4G is sealed by the seal ring 3 by being positioned between the two grooves 2Aj of the surface 2Aa of the first member 2A. This can be confirmed (see FIG. 7). The rotation direction of the rotary shaft 4A for expanding the diameter of the seal ring 3 is a direction in which the hook portion 6Aab comes out from the lower side of the operation pin 4Ad, and the rotary shaft 4A is moved until the seal ring 3 is in the expanded diameter state. After rotating in the direction of the arrow R2, the engaging rod 6Aa of the operating portion main body 6A is moved to the operating pin 4Ad by grasping the operating rod 6B of the rotary operating jig 6 by hand and lifting the operating rod 6B together with the operating portion main body 6A. Therefore, the rotary operation jig 6 can be easily detached from the expansion / contraction means 4 of the plug plug 1. Moreover, since the locking pin 5B is removed from the locking hole 2Ak by lifting the regulating portion main body 5A of the rotation regulating jig 5, the rotation regulating jig 5 can be removed from the plugging plug 1 together with the rotation operation jig 6.

  Thereafter, although not shown in the figure, the upper lid 43 is lifted by a crane and removed from the reactor vessel main body 42, and a waterproof seal is applied to the flange surface 42c and the surface 2Aa of the first member 2A of the plug main body 2 in the plug plug 1. The cavity of the reactor containment vessel 11 is filled with water.

  When removing the plug 1 from the stud hole 42d, the above procedure is reversed, and the engagement groove 6Aa of the operation portion main body 6A of the rotary operation jig 6 is engaged with the operation pin 4Ad of the expansion / contraction means 4 of the plug 1 Rotation shaft 4A in the rotation direction (in the direction of arrow R1 in FIG. 10) of rotation shaft 4A for relatively separating first member 2A and second member 2B and causing seal ring 3 to be reduced in diameter by its own elastic force. Rotate. By rotating the operation portion main body 6A in this rotational direction, the hook portion 6Aab is inserted below the operation pin 4Ad, and after the seal ring 3 is reduced in diameter by its own elastic force, the rotation operation jig 6 The stopper plug 1 can be lifted together and removed from the stud hole 42d by grasping the operation rod 6B by hand and lifting the operation rod 6B upward together with the operation portion main body 6A. When removing the plug 1 from the stud hole 42d, the rotation restricting jig 5 may not be used.

  As described above, the plug plug 1 of the present embodiment has the plug body 2 formed with an outer shape along the inner surface of the stud hole 42d so as to be inserted into the stud hole 42d to be plugged, and the plug body 2 A seal ring 3 formed in an annular shape along the outer periphery of the seal ring, an abutting portion (concave side surface 2Ac) disposed so as to abut on the inside of the seal ring 3, and when inserting the plug body 2 into the stud hole 42d or When the stopper body 2 is removed from the stud hole 42d, the seal ring 3 is supported in a reduced diameter state smaller than the inner diameter of the stud hole 42d, while the seal ring 3 is expanded in a state where the stopper body 2 is inserted into the stud hole 42d. Expansion / contraction means 4 that presses against the inner surface of the stud hole 42d.

  According to the plug 1, when the plug body 2 is inserted into the stud hole 42 d by the expansion / contraction means 4, the seal ring 3 is supported in a reduced diameter state smaller than the inner diameter of the stud hole 42 d, and the plug body 2 is supported by the stud hole. Since the diameter of the seal ring 3 is expanded and pressed against the inner surface of the stud hole 42d while being inserted into 42d, the air in the stud hole 42d is not compressed at the time of installation as in the case of a conventional plug, and compressed air is attached after installation. It is possible to prevent the plug plug 1 from being lifted by the influence of the above. Moreover, since the contact portion (concave side surface 2Ac) contacts the inside of the seal ring 3, it is possible to prevent the seal ring 3 from being deformed inward when the diameter of the seal ring 3 is increased. Therefore, it is possible to suppress the generation of rust due to water intrusion into the stud hole 42d, and it is possible to simplify the maintenance work for removing the rust. As a result, stable sealing performance can be obtained and workability can be improved.

  In the plug plug 1 of the present embodiment, it is desirable that the plug body 2 has a flat upper surface (surface 2Aa) that appears on the opening side of the stud hole 42d when inserted into the stud hole 42d.

  According to the plug 1, after the plug 1 is attached to the stud hole 42 d, the waterproof seal is smoothly applied to the flange surface 42 c of the stud hole 42 d and the upper surface (surface 2 Aa) of the plug plug 1. Can do. As a result, stable sealing performance can be obtained and workability can be improved.

  Moreover, in the plug 1 of this embodiment, it is desirable that the seal ring 3 has a flat surface on the outer peripheral surface 3e in a reduced diameter state.

According to the plug 1, the outer peripheral surface 3 e of the seal ring 3 has a flat surface,
A sufficient contact surface width can be obtained in which the outer peripheral surface 3e of the expanded seal ring 3 contacts the inner surface of the stud hole 42d. As a result, stable sealing performance can be obtained even if a fine flaw is generated on the inner surface of the stud hole 42d.

  Moreover, in the plug 1 of this embodiment, it is desirable that the expansion / contraction means 4 has a defining portion 4F that defines the diameter-reduced state and the diameter-expanded state of the seal ring 3.

  According to the plug 1, by defining the diameter-reduced state and the diameter-enlarged state of the seal ring 3 by the defining portion 4 </ b> F, it is possible to reliably attach and detach the stud ring 42 d, and to obtain sealing performance with certainty. Can do.

  Further, in the plug plug 1 of the present embodiment, the plug body 2 desirably has an indicator portion 4G that can visually check whether or not it is sealed by the seal ring 3.

  According to the plug 1, it is possible to visually confirm that the sealing performance is obtained by the indicator portion 4G.

  Further, in the plug plug 1 of the present embodiment, the plug body 2 is disposed on the bottom side of the stud hole 42d in opposition to the upper surface (surface 2Aa) that appears on the opening side of the stud hole 42d and the upper surface (surface 2Aa). It is desirable that the innermost surface (lower surface 4Bb) to be disposed is formed flat.

  According to the plug plug 1, the upper surface (surface 2Aa) and the bottom surface (bottom surface 4Bb) of the plug body 2 are formed flat, so that a plurality of plug plugs 1 can be stacked and stored narrowly. Even at a place, a plurality of plugs 1 can be stored.

  Moreover, in the plug plug 1 of this embodiment, it is desirable that the plug main body 2 has the latching part 4Bf in the part arrange | positioned at the hole bottom side of the stud hole 42d.

  According to this plug 1, the desiccant can be hooked on the bottom side of the stud hole 42 d by the hooking portion 4 Bf. As a result, the occurrence of rust in the stud hole 42d can be suppressed.

  Further, in the plug plug 1 of the present embodiment, the plug body 2 is arranged on the bottom side of the stud member 42d and the first member 2A that appears on the opening side of the stud hole 42d in a state of being inserted into the stud hole 42d. The seal ring 3 is provided between the first member 2A and the second member 2B, and the expansion / contraction means 4 penetrates the first member 2A and the second member 2B. A rotating shaft 4A rotatably provided around an axis C to be moved, and a moving portion (male screw portion 4Ab and a male screw portion 4Ab) that relatively moves the first member 2A and the second member 2B as the rotating shaft 4A rotates. It is desirable that the contact portion (concave side surface 2Ac) is fixed to either the first member 2A or the second member 2B.

  According to this plug 1, the expansion / contraction means 4 can be realized, and the shaft 4 </ b> A is rotated from the outside of the first member 2 </ b> A to expand the diameter of the seal ring 3, while the diameter of the seal ring 3 is reduced. Can be easily attached and removed.

  Further, in the plug 1 of the present embodiment, the rotating shaft 4A and the first member 2A have facing surfaces that are orthogonal to the shaft center C and face each other, and are annularly formed around the shaft center C between the facing surfaces. It is desirable that an arranged O-ring 4E is provided.

  According to this plug 1, the O-ring 4 </ b> E provided to ensure the sealing performance between the rotating shaft 4 </ b> A and the first member 2 </ b> A is disposed between facing surfaces that are orthogonal to the axis C and face each other. Thus, the O-ring 4E can be easily attached and detached as compared with the form wound around the rotating shaft 4A. As a result, the maintainability of the O-ring 4E can be improved.

  Further, in the plug 1 of the present embodiment, the expansion / contraction means 4 has a step portion (head 4Ac) that prevents the first member 2A from coming off on one end side of the rotating shaft 4A, and on the other end side of the rotating shaft 4A. It is desirable that the supporting member 4B for preventing the second member 2B from being detached is fixed to the rotating shaft 4A with a mounting bolt 4C that can be attached and detached.

  According to this plug 1, the supporting member 4B is removed from the rotating shaft 4A by removing the mounting bolt 4C, the rotating shaft 4A is extracted from the first member 2A and the second member 2B, and the first member 2A and the second member 2B. And the seal ring 3 can be removed. As a result, the maintainability of the seal ring 3 can be improved.

  The plug plug attaching / detaching jig of the present embodiment has a plug body 2 formed to have an outer shape along the inner surface of the stud hole 42 d so as to be inserted into the stud hole 42 d to be plugged, and along the outer periphery of the plug body 2. An annular seal ring 3, an abutting portion (concave side surface 2Ac) arranged so as to abut on the inner side of the seal ring 3, and when the plug body 2 is inserted into the stud hole 42d or the plug body 2 is studded When the seal ring 3 is removed from the hole 42d, the seal ring 3 is supported in a reduced diameter state smaller than the inner diameter of the stud hole 42d, while the seal ring 3 is expanded in a state where the plug body 2 is inserted into the stud hole 42d. An attachment / detachment jig for the plug plug 1, which is provided with an expansion / contraction means 4 to be pressed against the plug, and engages with the expansion / contraction means 4 of the plug plug 1 so that the engagement state is maintained. Includes a (engaging groove 6Aa), the operation unit for operating the scaling means 4 via the engaging portion (engaging groove 6Aa) and (operation rod 6B), the.

  According to this plug plug attaching / detaching jig, the engagement portion (engagement groove 6Aa) is engaged with the expansion / contraction means 4 of the plug plug 1 and the engagement state is maintained, so that the expansion / contraction means 4 is operated by the operation portion (operation rod 6B). ) And the plugging plug 1 can be installed in or removed from the stud hole 42d via the operation portion (operation rod 6B).

  Further, in the plug plug attaching / detaching jig of the present embodiment, the plug main body 2 is arranged on the bottom side of the stud hole 42d and the first member 2A appearing on the opening side of the stud hole 42d in the state inserted in the stud hole 42d. The seal ring 3 is provided between the first member 2A and the second member 2B, and the expansion / contraction means 4 includes the first member 2A and the second member 2B. A rotating shaft 4A provided rotatably around a penetrating axis C, and a moving portion (male screw portion 4Ab) for moving the first member 2A and the second member 2B relatively close to and away from each other as the rotating shaft 4A rotates. And the female screw hole 2Bc), the engaging portion (engaging groove 6Aa) is engaged with the rotating shaft 4A and the engaged state is maintained, and the operating portion (operating rod 6B) is the engaging portion. The rotary shaft 4A can be rotated via the (engagement groove 6Aa). Provided, further comprising desirably operating unit regulating portion for regulating the rotating together of the first member 2A during rotation of the rotary shaft 4A by (joystick 6B) (rotation regulating jig 5).

  According to the plug plug attaching / detaching jig, the plug plug is further provided with a restricting portion (rotation restricting jig 5) and restricting the rotation of the first member 2A when the rotating shaft 4A is rotated by the operation portion (operating rod 6B). It is possible to reliably install and remove the first stud hole 42d.

  The plug plug attachment method of the present embodiment includes a plug body 2 having an outer shape along the inner surface of the stud hole 42d so as to be inserted into the stud hole 42d to be plugged, and an outer periphery of the plug body 2. An annular seal ring 3, an abutting portion (concave side surface 2Ac) arranged so as to abut on the inner side of the seal ring 3, and when the plug body 2 is inserted into the stud hole 42d or the plug body 2 is studded When the seal ring 3 is removed from the hole 42d, the seal ring 3 is supported in a reduced diameter state smaller than the inner diameter of the stud hole 42d, while the seal ring 3 is expanded in a state where the plug body 2 is inserted into the stud hole 42d. Plugging plug 1 provided with the expansion / contraction means 4 to be pressed against, and an engaging portion (engagement groove) that engages with the expansion / contraction means 4 of the plugging plug 1 and maintains the engaged state A plug plug attachment method using a plug plug attachment / detachment jig comprising: Aa) and an operation portion (operation rod 6B) for operating the expansion / contraction means 4 via an engagement portion (engagement groove 6Aa), The plug body 2 is moved to the stud hole 42d together with the engagement portion (engagement groove 6Aa) in a form in which the engagement portion (engagement groove 6Aa) is engaged with the expansion / contraction means 4 and the engagement state is maintained. In a state where it is inserted into the hole 42d, the operating portion (operating rod 6B) is operated to expand the diameter of the seal ring 3 and press it against the inner surface of the stud hole 42d, and then the engaging portion (engaging groove 6Aa) is removed from the expanding / contracting means 4. Remove.

  According to this plug plug mounting method, the plug body 2 is moved to the stud hole 42d in such a manner that the engagement portion (engagement groove 6Aa) is engaged with the expansion / contraction means 4 and the engagement state is maintained, and the seal ring 3 is moved. Since the engagement portion (engagement groove 6Aa) is removed from the expansion / contraction means 4 with the diameter expanded and pressed against the inner surface of the stud hole 42d, the plugging plug 1 can be easily installed in the stud hole 42d.

  The plug plug removing method of the present embodiment includes a plug body 2 formed to have an outer shape along the inner surface of the stud hole 42 d so as to be inserted into the stud hole 42 d to be plugged, and along the outer periphery of the plug body 2. A ring-shaped seal ring 3, a contact portion (concave side surface 2Ac) disposed so as to contact the inside of the seal ring 3, and when the plug body 2 is inserted into the stud hole 42d or when the plug body 2 is When the seal ring 3 is removed from the stud hole 42d, the seal ring 3 is supported in a reduced diameter state smaller than the inner diameter of the stud hole 42d. On the other hand, the diameter of the seal ring 3 is increased while the plug body 2 is inserted into the stud hole 42d. A plug plug 1 having an expansion / contraction means 4 to be pressed against the inner surface, and an engagement portion (engagement groove) that engages with the expansion / contraction means 4 of the plug plug 1 and maintains the engagement state. A plug plug removing method using a plug plug attachment / detachment jig comprising: Aa) and an operation portion (operation rod 6B) for operating the expansion / contraction means 4 via an engagement portion (engagement groove 6Aa), From the state where the main body 2 is inserted into the stud hole 42d and the seal ring 3 is expanded in diameter and pressed against the inner surface of the stud hole 42d, the engagement portion (engagement groove 6Aa) is engaged with the expansion / contraction means 4 and the engagement state is maintained. After the operation portion (operation rod 6B) is operated to support the seal ring 3 in a reduced diameter state smaller than the inner diameter of the stud hole 42d, the plug body 2 is moved together with the engagement portion (engagement groove 6Aa). After removing from the stud hole 42d, the engaging portion (engaging groove 6Aa) is removed from the expansion / contraction means 4.

  According to this plug plug removing method, the engagement portion (engagement groove 6Aa) is engaged with the expansion / contraction means 4 so that the engagement state is maintained and the seal ring 3 is reduced in diameter smaller than the inner diameter of the stud hole 42d. Since the plug body 2 is removed from the stud hole 42d together with the engaging portion (engagement groove 6Aa) after being supported in the state, the plug plug 1 can be easily removed from the stud hole 42d.

  The plug plug maintenance method of the present embodiment includes a plug body 2 having an outer shape along the inner surface of the stud hole 42 d so as to be inserted into the stud hole 42 d to be plugged, and an outer periphery of the plug body 2. An annular seal ring 3, an abutting portion (concave side surface 2Ac) arranged so as to abut on the inner side of the seal ring 3, and when the plug body 2 is inserted into the stud hole 42d or the plug body 2 is studded When the seal ring 3 is removed from the hole 42d, the seal ring 3 is supported in a reduced diameter state smaller than the inner diameter of the stud hole 42d, while the seal ring 3 is expanded in a state where the plug body 2 is inserted into the stud hole 42d. Expansion / contraction means 4 that presses against the plug body 2, and the plug body 2 is located on the opening side of the stud hole 42 d when inserted into the stud hole 42 d The seal member 3 includes a first member 2A and a second member 2B disposed on the bottom side of the stud hole 42d, and the seal ring 3 is sandwiched between the first member 2A and the second member 2B. The expansion / contraction means 4 includes a rotary shaft 4A that is rotatably provided around an axis C that penetrates the first member 2A and the second member 2B, and the first member 2A and the second member 2A as the rotary shaft 4A rotates. And a moving part (male screw part 4Ab and female screw hole 2Bc) for moving the member 2B relatively close to and away from each other, and the expansion / contraction means 4 is a step part for preventing the first member 2A from coming off at one end side of the rotating shaft 4A. Maintenance of the plug 1 having the (head 4Ac), and having a support member 4B that prevents the second member 2B from coming off from the other end of the rotary shaft 4A is fixed to the rotary shaft 4A by a detachable mounting bolt 4C. The method includes a rotating bolt 4A to a mounting bolt 4C and a support Remove the member 4B, after replacing the sealing ring 3 from the rotation shaft 4A and remove the second member 2B, a second member 2B attached to the rotary shaft 4A, attaching a support to the rotating shaft 4A member 4B and mounting bolts 4C.

  According to this plug plug maintenance method, the support member 4B is removed from the rotating shaft 4A by removing the mounting bolt 4C, and the rotating shaft 4A is removed from the first member 2A and the second member 2B, and the first member 2A and the second member are removed. 2B can be separated and the seal ring 3 can be removed. As a result, the maintainability of the seal ring 3 can be improved.

  Further, in the plug plug maintenance method of the present embodiment, the rotating shaft 4A and the first member 2A each have facing surfaces that are orthogonal to the shaft center C and face each other, and annular between the facing surfaces around the shaft center C. The O-ring 4E is provided, and the mounting bolt 4C and the support member 4B are removed from the rotating shaft 4A, the second member 2B is removed from the rotating shaft 4A, the seal ring 3 is removed, and the first from the rotating shaft 4A. The member 2A is removed, the O-ring 4E is removed, the O-ring 4E is replaced and the first member 2A is attached to the rotating shaft 4A, the seal ring 3 is replaced and the second member 2B is attached to the rotating shaft 4A, and the rotating shaft 4A The support member 4B and the mounting bolt 4C are attached to the.

  According to this plug plug maintenance method, the O-ring 4E provided for ensuring the sealing performance between the rotating shaft 4A and the first member 2A is disposed between the facing surfaces orthogonal to the axis C and facing each other. Thereby, compared with the form wound around the rotating shaft 4A, the O-ring 4E can be easily attached and detached. As a result, the maintainability of the O-ring 4E can be improved.

DESCRIPTION OF SYMBOLS 1 Plug plug 2 Plug body 2A 1st member 2Aa Surface 2Ab Side surface 2Ac Concave side surface 2Ad Receiving surface 2Ae Through-hole 2Af Recessed portion 2Ag Hole portion 2Ah Annular groove 2Ai Abutting portion 2Aj Groove 2Ak Locking hole 2B Second member 2Ba Inner surface 2Bb Receiving surface 2Bc female screw hole 3 seal ring 3a inner surface 3b recess 3c upper surface 3d lower surface 3e outer peripheral surface 4 expansion / contraction means 4A rotating shaft 4Aa rotating shaft portion 4Ab male screw portion 4Ac head 4Ad operation pin 4Ae fitting projection 4Bf upper surface 4B support member 4B Lower surface 4Bc Housing recess 4Bd Mating recess 4Be Through hole 4Bf Hook 4C Mounting bolt 4Ca Head 4D Fixing pin 4E O-ring 4F Regulation part 4G Index part 5 Rotation restriction jig 5A Restriction part body 5Aa Cut hole 5B Locking pin 5C Anti-rotation part 5D Anti-tilt part 6 Rotation operation jig 6A Work body 6Aa engaging groove 6Aaa engagement edge 6Aab hook 6B operation rod 6C operating handle 42d stud hole 42da flat portion 42db inside surface C axis

Claims (17)

A plug body formed to have an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged;
A seal ring formed in an annular shape along the outer periphery of the stopper body;
A contact portion arranged to contact the inside of the seal ring;
When inserting the plug body into the hole or removing the plug body from the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, while the plug body is inserted into the hole. Expanding and contracting means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole;
A plug with a plug.   The plug plug according to claim 1, wherein the plug body has a flat upper surface that appears on the opening side of the hole when inserted into the hole.   The said stopper main body has the taper surface which fits into the taper surface of the inner surface of the said opening part so that the flange surface and the said upper surface of the said opening part side may become the same level in the state inserted in the said hole. Plug plug as described in 1.   The plug according to any one of claims 1 to 3, wherein the seal ring has a flat surface on the outer peripheral surface in the reduced diameter state.   The plug plug according to any one of claims 1 to 4, wherein the expansion / contraction means includes a defining portion that defines the reduced diameter state and the expanded diameter state of the seal ring.   The plug plug according to any one of claims 1 to 5, wherein the plug body has an indicator portion that allows visual confirmation of whether or not the seal body is sealed by the seal ring.   7. The plug body according to claim 1, wherein an upper surface that appears on the opening side of the hole and a hole bottom surface that is disposed on the hole bottom side are opposite to the upper surface. The stopper plug according to one.   The plug body according to any one of claims 1 to 7, wherein the plug body has a latching portion at a portion arranged on the bottom side of the hole. The plug body includes a first member appearing on the opening side of the hole and a second member arranged on the hole bottom side in a state of being inserted into the hole,
The seal ring is provided between the first member and the second member,
The expansion / contraction means has a rotation shaft rotatably provided around an axis passing through the first member and the second member, and the first member and the second member relative to each other as the rotation shaft rotates. A moving part that moves close to and away from each other,
The plug according to any one of claims 1 to 8, wherein the contact portion is fixed to one of the first member and the second member.   The rotating shaft and the first member have opposing faces that are orthogonal to the axial center and face each other, and an O-ring that is annularly disposed around the axial center is provided between the opposing faces. The stopper plug according to claim 9.   The expansion / contraction means has a step portion for preventing the first member from coming off on one end side of the rotating shaft, and a support member for preventing the second member from coming off from the other end side of the rotating shaft is attached to and detached from the rotating shaft. The plug according to claim 9 or 10, wherein the plug is fixed with possible mounting bolts. A plug body formed to have an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged;
A seal ring formed in an annular shape along the outer periphery of the stopper body;
A contact portion arranged to contact the inside of the seal ring;
When inserting the plug body into the hole or removing the plug body from the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, while the plug body is inserted into the hole. Expanding and contracting means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole;
A plugging plug detachable jig comprising:
An engaging portion that engages with the expansion / contraction means of the plug plug and is held in an engaged state;
An operating section for operating the expansion / contraction means via the engaging section;
A plug plug attaching / detaching jig. The plug body includes a first member appearing on the opening side of the hole and a second member arranged on the hole bottom side in a state of being inserted into the hole,
The seal ring is provided between the first member and the second member,
The expansion / contraction means has a rotation shaft rotatably provided around an axis passing through the first member and the second member, and the first member and the second member relative to each other as the rotation shaft rotates. A moving part that moves close to and away from each other,
The engaging portion is engaged with the rotating shaft and the engaged state is maintained,
The operation portion is provided to be able to rotate the rotation shaft via the engagement portion,
The plug plug attaching / detaching jig according to claim 12, further comprising a restricting portion that restricts the rotation of the first member when the rotating shaft is rotated by the operation portion. A plug body formed to have an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged;
A seal ring formed in an annular shape along the outer periphery of the stopper body;
A contact portion arranged to contact the inside of the seal ring;
When inserting the plug body into the hole or removing the plug body from the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, while the plug body is inserted into the hole. Expanding and contracting means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole;
Plug plug with,
And an engaging portion that engages with the expansion / contraction means of the plugging plug and holds the engagement state;
An operating section for operating the expansion / contraction means via the engaging section;
Plugging plug attaching / detaching jig comprising,
A plug plug mounting method using
In a state where the engagement portion is engaged with the expansion / contraction means and the engagement state is maintained, the plug body is moved to the hole together with the engagement portion, and the operation is performed with the plug body inserted into the hole. A plug mounting method for removing the engagement portion from the expansion / contraction means after operating the portion to expand the diameter of the seal ring and pressing it against the inner surface of the hole. A plug body formed to have an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged;
A seal ring formed in an annular shape along the outer periphery of the stopper body;
A contact portion arranged to contact the inside of the seal ring;
When inserting the plug body into the hole or removing the plug body from the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, while the plug body is inserted into the hole. Expanding and contracting means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole;
Plug plug with,
And an engaging portion that engages with the expansion / contraction means of the plugging plug and holds the engagement state;
An operating section for operating the expansion / contraction means via the engaging section;
Plugging plug attaching / detaching jig,
A plug plug removing method using
From the state in which the plug body is inserted into the hole to expand the diameter of the seal ring and pressed against the inner surface of the hole, the engagement portion is engaged with the expansion / contraction means and the engagement state is maintained. After operating the operation portion to support the seal ring in a reduced diameter state smaller than the inner diameter of the hole, the plug body is removed from the hole together with the engagement portion, and then the engagement portion is removed from the expansion / contraction means. How to remove the plug. A plug body formed to have an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged;
A seal ring formed in an annular shape along the outer periphery of the stopper body;
A contact portion arranged to contact the inside of the seal ring;
When inserting the plug body into the hole or removing the plug body from the hole, the seal ring is supported in a reduced diameter state smaller than the inner diameter of the hole, while the plug body is inserted into the hole. Expanding and contracting means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole;
With
The plug body includes a first member appearing on the opening side of the hole and a second member arranged on the hole bottom side in a state of being inserted into the hole,
The seal ring is provided between the first member and the second member,
The expansion / contraction means has a rotation shaft rotatably provided around an axis passing through the first member and the second member, and the first member and the second member relative to each other as the rotation shaft rotates. A moving part that moves close to and away from each other,
The expansion / contraction means has a step portion that prevents the first member from coming off on one end side of the rotary shaft, and a support member that prevents the second member from coming off on the other end side of the rotary shaft. Maintenance method of the plug plug fixed with a mounting bolt that can be attached and detached,
The mounting bolt and the support member are removed from the rotating shaft, the second member is removed from the rotating shaft and the seal ring is replaced. Then, the second member is attached to the rotating shaft, and the support is supported on the rotating shaft. A plug plug maintenance method for attaching a member and the mounting bolt. The rotating shaft and the first member have opposing faces that are orthogonal to the axial center and face each other, and an O-ring that is annularly disposed around the axial center is provided between the facing faces. ,
The mounting bolt and the support member are removed from the rotating shaft, the second member is removed from the rotating shaft, the seal ring is removed, the first member is removed from the rotating shaft, the O-ring is removed, and the O-ring is removed. The plug according to claim 16, wherein the first member is attached to the rotating shaft, the seal ring is replaced, the second member is attached to the rotating shaft, and the support member and the mounting bolt are attached to the rotating shaft. Plug maintenance method.

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