JP7100999B2 - Plug plug, plug plug attachment / detachment jig, plug plug mounting method, plug plug removal method, and plug plug maintenance method - Google Patents

Description

The present invention relates to a plug plug, a plug plug attachment / detachment jig, a plug plug attachment method, a plug plug removal method, and a plug plug maintenance method, which are used for plugging an opening in a bolt hole or the like, for example.

During periodic inspections at a nuclear power plant, the stud bolts of the reactor vessel are removed, the top lid is removed from the body, and the cavity in which the reactor vessel is located is filled with water. In such a case, if water enters the stud hole to which the stud bolt is fixed in the body of the reactor vessel, rust is generated in the threaded portion of the stud hole. Therefore, maintenance work to remove rust is required.

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 formed so that it can be inserted into the stud hole, and the plug body is pressed against the inner surface of the stud hole by elastic force. It can be installed by pushing it into the stud hole. In addition, the plug body has a female screw portion formed on the upper surface, and the male screw portion formed at the tip of the rod member in the detachable jig is screwed to this female screw portion, and the plug is attached to the stud hole. And removal.

By the way, for example, in Patent Document 1, as a water stop valve 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. A 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. Those provided facing each other are disclosed. That is, the water stop valve for piping work of Patent Document 1 obtains sealing performance by applying tightening compression by a tightening means to the annular packing material and utilizing the outward swelling action due to the bending phenomenon of the annular packing material. ..

Jikkai Sho 52-156324

The conventional plug that plugs the stud hole has a sealing performance due to the elastic force of the O-ring, and can be attached by pushing the plug body into the stud hole. For this reason, the air in the stud hole is compressed at the time of installation, and the plug tends to float due to the influence of the compressed air after installation. After installing the plug, there is work to attach a waterproof seal from above the plug to the flange surface of the body of the reactor vessel where the stud hole is formed, but when the plug is lifted, the waterproof seal is attached. There is a risk of hindering attachment. Moreover, the conventional plug that plugs the stud hole has obtained sealing performance by the elastic force of the O-ring, and the contact width of the O-ring with the inner surface of the stud hole is about 2 mm, so that the inner surface of the stud hole is fine. If it is scratched, the sealing performance may be impaired. 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 becomes larger, so that a large pushing force is required when pushing the plug body into the stud hole. It is not desirable because the influence of the compressed air that lifts the plug body is also large.

Further, since the conventional detachable jig related to the plug has a structure in which the male screw portion is screwed to the female screw portion of the plug main body, it is not easy to attach / detach the detachable jig to / from the plug main body. For this reason, the work of attaching and detaching the plug to the stud hole is poor and takes time, which is not desirable as the work in a radiation environment.

Further, in the water stop valve of Patent Document 1, since a space is formed inside the annular packing material, the annular packing material is deformed inward, so that the outward swelling action is insufficient and the sealing performance is insufficient. Cannot be secured. Therefore, the water stop valve of Patent Document 1 is not suitable as a plug for plugging a stud hole.

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

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

Further, in the plug according to one aspect of the present invention, it is desirable that the upper surface of the plug body, which appears on the opening side of the hole when inserted into the hole, is formed flat.

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

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

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

Further, in the plug according to one aspect of the present invention, it is desirable that the plug main body has an index portion that allows visually recognizing whether or not the plug is sealed by the seal ring.

Further, in the plug according to one aspect of the present invention, the plug main body has an upper surface appearing on the opening side of the hole and a surface on the hole bottom side arranged on the hole bottom side contrary to the upper surface. It is desirable that it is formed flat.

Further, in the plug according to one aspect of the present invention, it is desirable that the plug body has a hooking portion at a portion arranged on the bottom side of the hole.

Further, in the plug according to one aspect of the present invention, the plug main body has a first member appearing on the opening side of the hole and a second member arranged on the bottom side of the hole when the plug body is inserted into the hole. , The seal ring is provided sandwiched between the first member and the second member, and the expansion / contraction means is provided around the axis penetrating the first member and the second member. The contact portion includes a rotary shaft rotatably provided and a moving portion that moves the first member and the second member relatively close to each other with the rotation of the rotary shaft, and the contact portion is the first. It is desirable that the member is fixed to either the member or the second member.

Further, in the plug according to one aspect of the present invention, the rotating shaft and the first member each have facing surfaces orthogonal to the axis and facing each other, and around the axis between the facing surfaces. It is desirable that an O-ring arranged in a ring shape is provided on the surface.

Further, in the plug according to one aspect of the present invention, the expansion / contraction means has a step portion on one end side of the rotating shaft for preventing the first member from coming off, while the second one on the other end side of the rotating shaft. It is desirable that the support member that prevents the member from coming off is fixed to the rotating shaft with a detachable mounting bolt.

In order to achieve the above object, the plug attachment / detachment jig according to one aspect of the present invention includes a plug body formed with 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 so as to abut on the inside of the seal ring, and when the stopper body is inserted into the hole or the stopper body is inserted. 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 seal ring is expanded in diameter and pressed against the inner surface of the hole with the plug body inserted in the hole. A jig for attaching and detaching a plug, which comprises means, and operates the expansion / contraction means via an engaging portion that engages with the expansion / contraction means of the plug and holds an engaged state, and the engaging portion. It is equipped with an operation unit.

Further, in the plug attachment / detachment jig according to one aspect of the present invention, the plug main body is arranged on the hole bottom side and the first member appearing on the opening side of the hole in a state of being inserted into the hole. The seal ring is provided sandwiched between the first member and the second member, and the expansion / contraction means is an axial center penetrating the first member and the second member. The engaging portion includes a rotating shaft provided so as to be rotatable around the rotation shaft, and a moving portion that moves the first member and the second member relatively close to each other as the rotating shaft rotates. , The engaged state is maintained by engaging with the rotating shaft, and the operating portion is provided so that the rotating shaft can rotate via the engaging portion, and when the operating portion rotates the rotating shaft, the first It is desirable to further provide a regulatory unit that regulates the rotation of members.

In order to achieve the above object, the plug plug mounting method according to one aspect of the present invention includes a plug body formed with 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 so as to abut on the inside of the seal ring, and when the stopper body is inserted into the hole or the stopper body is inserted. 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 seal ring is expanded in diameter and pressed against the inner surface of the hole with the plug body inserted in the hole. A plug including the means, an engaging portion that engages with the expanding / contracting means of the plug and holds an engaged state, and an operating portion that operates the expanding / contracting means via the engaging portion. A plugging plug mounting method using a plugging plug attachment / detachment tool provided, wherein the plug body is moved to the hole together with the engaging portion in a form in which the engaging portion is engaged with the expansion / contraction means and the engaged state is maintained. With the stopper body inserted into the hole, the operation portion is operated to expand the diameter of the seal ring and press it against the inner surface of the hole, and then the engaging portion is removed from the expansion / contraction means.

In order to achieve the above object, the plug plug removing method according to one aspect of the present invention includes a plug body formed with 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 so as to abut on the inside of the seal ring, and when the stopper body is inserted into the hole or the stopper 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 with the stopper body inserted in the hole. A plug having an expansion / contraction means, an engaging portion that engages with the expansion / contraction means of the plug and holds an engaged state, and an operation unit that operates the expansion / contraction means via the engaging portion. A method for removing a plug using a plug-removing jig, wherein the plug body is inserted into the hole, the diameter of the seal ring is expanded, and the engaging portion is pressed against the inner surface of the hole. After engaging with the expansion / contraction means and maintaining the engaged state, the operating portion is operated to support the seal ring in a reduced diameter state smaller than the inner diameter of the hole, and then the plug together with the engaging portion. The main body is removed from the hole, and then the engaging portion is removed from the scaling means.

In order to achieve the above object, the plug plug maintenance method according to one aspect of the present invention includes a plug body formed with 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, an abutting portion arranged so as to abut on the inside of the seal ring, and when the stopper body is inserted into the hole or the stopper body is inserted. 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 seal ring is expanded in diameter and pressed against the inner surface of the hole with the plug body inserted in the hole. The plug body comprises means, and the plug body includes a first member that appears on the opening side of the hole and a second member that is arranged on the bottom side of the hole when inserted into the hole, and the seal ring. Is provided sandwiched between the first member and the second member, and the expansion / contraction means is rotatably provided around an axis penetrating the first member and the second member. The expansion / contraction means includes the shaft and a moving portion that relatively moves the first member and the second member relatively close to each other with the rotation of the rotating shaft, and the scaling means is the first on one end side of the rotating shaft. Maintenance of a plug that has a stepped portion that prevents the member from coming off, while the support member that prevents the second member from coming off on the other end side of the rotating shaft is fixed to the rotating shaft with a detachable mounting bolt. In the method, 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 replaced, and then the second member is attached to the rotating shaft. The support member and the mounting bolt are attached to the rotating shaft.

Further, in the plugging plug maintenance method according to one aspect of the present invention, the rotating shaft and the first member each have facing faces perpendicular to the axis and facing each other, and the axis is between the facing faces. An O-ring arranged in an annular shape is provided around the rotary shaft, and the mounting bolt and the support member are removed from the rotary shaft, the second member is removed from the rotary shaft, and the seal ring is removed, and the rotary shaft is removed. The first member is removed from the above, 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 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 in the state where the plug body is inserted into the hole by the expansion / contraction means. Since it is pressed against the inner surface of the hole, the air in the hole is not compressed at the time of mounting unlike the conventional plug, and it is possible to prevent the plug from being lifted by the influence of the compressed air after mounting. Moreover, since the abutting portion abuts on the inside of the seal ring, it is possible to prevent the seal ring from being deformed inward when the diameter of the seal ring is increased. Therefore, it is possible to suppress the infiltration of water into the hole, and it is possible to simplify the maintenance work due to this. 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 spark plug according to an embodiment of the present invention is applied. FIG. 2 is a vertical sectional view of a pressurized water reactor to which a spark plug according to an embodiment of the present invention is applied. FIG. 3 is a vertical sectional view of a spark plug according to an embodiment of the present invention. FIG. 4 is a plan view of the plug according to the embodiment of the present invention. FIG. 5 is a bottom view of the plug according to the embodiment of the present invention. FIG. 6 is a vertical sectional view showing an operation diagram of the plug according to the embodiment of the present invention. FIG. 7 is a plan view showing an operation diagram of the plug according to the embodiment of the present invention. FIG. 8 is an exploded vertical sectional view of the plug plug according to the embodiment of the present invention. FIG. 9 is a perspective view of the plug attachment / detachment jig according to the embodiment of the present invention. FIG. 10 is a partially enlarged perspective view of the plug attachment / detachment jig according to the embodiment of the present invention. FIG. 11 is a perspective view showing a plugging plug mounting method according to an embodiment of the present invention. FIG. 12 is a perspective view showing a plugging plug mounting method according to an embodiment of the present invention. FIG. 13 is a perspective view showing a plugging plug mounting method according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components 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 according to the present embodiment is applied. FIG. 2 is a vertical sectional view of a pressurized water reactor to which a spark plug according to the present embodiment is applied.
The reactor applied to the nuclear power plant of the present embodiment uses light water as a reactor cooling material and a neutron reducing material to make high-temperature high-pressure water that does not boil over the entire primary system, and sends this high-temperature high-pressure water to the steam generator. It is a pressurized water reactor (PWR) that generates steam by heat exchange and sends this steam to a turbine generator to generate power.

As shown in FIG. 1, the reactor containment vessel 11 contains a pressurized water reactor 12 and a steam generator 13. The pressurized water reactor 12 and the steam generator 13 are connected to each other 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 cooling material circulation pump 17. Therefore, in the pressurized water reactor 12, light water is heated as a primary coolant by the fuel constituting the core, and the high-temperature light water is maintained at a predetermined high pressure by the pressurizer 16, and the steam generator 13 is passed through the cooling water pipe 14. Will be sent to. In the steam generator 13, heat is exchanged between the high-temperature and high-pressure light water (primary coolant) and the secondary coolant, and the cooled light water is pressurized water through the cooling water pipe 15 by the primary coolant circulation pump 17. Returned to reactor 12.

The steam generator 13 is connected to the steam turbine 18 and the 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. Further, the steam turbine 18 is connected to the generator 23. The condenser 19 is connected to an intake pipe 24 and a drain pipe 25 for supplying and discharging cooling water (for example, seawater). Therefore, the steam generated by heat exchange 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 drives the steam turbine 18 to generate power. Power is generated by the machine 23. The steam that drives 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 is provided with a reactor vessel main body 42 and an upper lid 43 attached to the upper portion thereof so that an internal structure thereof can be inserted into the reactor vessel 41. It is configured. The reactor vessel body 42 is fixed in the cavity of the reactor containment vessel 11, has an opening 42a at the upper end, and has a cylindrical shape closed by a spherical mirror 42b at the lower end. The upper lid 43 is fixed to the reactor vessel body 42 by a plurality of stud bolts 44 and nuts 45 arranged along a cylindrical shape, and the opening 42a of the reactor vessel body 42 is opened by attaching and detaching the stud bolts 44 and the nuts 45. It is provided so that it can be opened and closed.

The reactor vessel main body 42 is formed with an inlet nozzle (inlet tube stand) 47 for supplying light water (coolant) as primary cooling water and an outlet nozzle (outlet tube stand) 48 for discharging light water at the upper part. The reactor internal structure is inserted into the reactor vessel main body 42.

The structure inside the furnace will be described. The upper core support plate 49 is fixed above the inlet nozzle 47 and the outlet nozzle 48, while the lower core support plate 50 is fixed near the lower mirror 46. In the upper core support plate 49, the upper core plate 52 is connected downward via a plurality of core support rods 51. Further, a core tank 53 having a cylindrical shape is arranged with a predetermined gap from the inner wall surface of the reactor vessel main body 42. In the core tank 53, the upper core plate 52 is connected to the upper part, and the lower core plate 54 is connected to the lower part. The lower core plate 54 is supported by the lower core support plate 50. The 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. A large number of control rods 57 are arranged inside the core 55. The upper ends of the large number of control rods 57 are grouped together to form a control rod cluster 58, which can be inserted into the fuel assembly 56. A large number of control rod cluster guide pipes 59 are fixed to the upper core support plate 49 so as to penetrate the upper core support plate 49 itself. The lower end of each control rod cluster guide pipe 59 extends to the control rod cluster 58 in the fuel assembly 56.

The upper lid 43 constituting the reactor vessel 41 is provided with a control rod drive device 60 for a magnetic jack at the upper part. The upper end of the large number of control rod cluster guide pipes 59 described above extends to the control rod drive device 60. In the control rod drive device 60, the control rod cluster drive shaft 62 extends through the control rod cluster guide pipe 59 to the fuel assembly 56, and the control rod cluster 58 can be gripped. The control rod drive device 60 controls the output of the reactor by moving the control rod cluster drive shaft 62 up and down.

Therefore, by moving the control rod cluster drive shaft 62 by the control rod drive device 60 and inserting the control rod 57 into the fuel assembly 56, nuclear fission in the core 55 is controlled, and the generated thermal energy is used to control the reactor vessel. The light water filled in the 41 is heated, and the hot 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 emits neutrons by nuclear fission, and the moderator and light water as the primary cooling water reduce the kinetic energy of the emitted fast neutrons to become thermal neutrons, which is new. It makes it easy for nuclear fission to occur, and at the same time, it takes away the generated heat and cools it. Further, by inserting the control rods 57 into the fuel assembly 56, the number of neutrons generated in the core 55 is adjusted, and the control rods 57 are rapidly inserted into the core 55 when the reactor is stopped urgently.

As described above, in the reactor vessel 41, the reactor vessel body 42 and the upper lid 43 are detachably attached to the upper part of the reactor vessel body 42 by a plurality of stud bolts 44 and nuts 45. The stud bolt 44 has a lower threaded portion 44a, a central penetrating portion 44b, and an upper threaded portion 44c. The stud bolt 44 has a lower threaded portion 44a screwed into a stud hole 42d, which is a screw hole formed in a flange surface 42c facing upward so as to form a peripheral edge of an opening 42a of the reactor vessel body 42, to form a reactor vessel body. It is fixed to 42. Further, in the stud bolt 44, the penetrating portion 44b penetrates the mounting hole 43a formed in the upper lid 43 of the reactor vessel 41, and the upper screw portion 44c protrudes upward from the mounting hole 43a. Then, by screwing the nut 45 while applying pressure to the stud bolt 44 upward away from the reactor vessel body 42, the nut 45 can be fastened or loosened, and the reactor vessel body 42 can be fastened or loosened. On the other hand, the upper lid 43 can be attached and detached.

FIG. 3 is a vertical cross-sectional view of the plug according to the present embodiment. FIG. 4 is a plan view of the plug according to the present embodiment. FIG. 5 is a bottom view of the plug according to the present embodiment. FIG. 6 is a vertical sectional view showing an operation diagram of the plug according to the present embodiment. FIG. 7 is a plan view showing an operation diagram of the plug according to the present embodiment. FIG. 8 is a vertical cross-sectional view of the plug plug according to the present embodiment.

The plug of the present embodiment is used to prevent 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 close 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 a scaling means 4.

As shown in FIG. 3, the plug main body 2 is formed to have 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. 4 and 5.

The plug main 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 hole bottom side of the stud hole 42d when inserted into the stud hole 42d. The stud hole 42d is formed by opening the opening upward and having a bottom portion downward. In the plug main 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 done.

The first member 2A is formed in a disk shape. In the first member 2A, the outermost surface 2Aa that appears on the opening side of the stud hole 42d when inserted into the stud hole 42d is formed flat. The surface 2Aa of the first member 2A is the outermost surface (upper surface) of the plug 1 and forms the maximum area as the front surface surface of the first member 2A. Therefore, the surface 2Aa (upper surface of the plug 1) of the first member 2A is flush with the flat portion (flange surface) 42da on the peripheral edge of the opening of the stud hole 42d when the surface 2Aa (upper surface of the plug 1) is inserted into the stud hole 42d. Can be.

Further, in the first member 2A, the outermost side surface 2Ab facing the inner surface of the stud hole 42d is connected downward from the surface 2Aa to be continuously formed in an annular shape in a state of being inserted into the stud hole 42d, and faces the surface 2Aa side. It forms a tapered surface that gradually expands upward. In the stud hole 42d, a tapered surface gradually expanding upward (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 the tapered surfaces are formed so as to fit each other with respect to the inner surface 42db of the opening of the stud hole 42d. Then, the 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 to each other, so that the surface 2Aa (upper surface of the plug 1) of the first member 2A becomes the stud hole 42d. It is possible to maintain the same level as the flat portion (flange surface) 42da on the peripheral edge of the opening.

Further, the first member 2A is formed in a cylindrical shape in which a portion lower than the side surface 2Ab extends downward and is continuous in an annular shape. The tubular portion is formed so as to be recessed inward from the side surface 2Ab, and a concave side surface 2Ac which is continuous in an annular shape toward the outside is formed. The concave side surface 2Ac is a surface facing the inner surface of the stud hole 42d in a state where the first member 2A is inserted into the stud hole 42d, and is provided as an abutting portion that abuts on the inside of the seal ring 3. Further, in the first member 2A, a receiving surface 2Ad which is continuous in an annular shape is formed in a step portion where a cylindrical portion is recessed inward on the lower side of the side surface 2Ab. The receiving surface 2Ad forms a tapered surface that gradually extends upward from the upper end of the concave side surface 2Ac toward the outside. 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 disk shape. In the second member 2B, the innermost inner surface 2Ba arranged on the hole bottom side of the stud hole 42d is formed flat when inserted into the stud hole 42d. Further, the second member 2B has an outer edge extending upward and is formed in an annular continuous tubular shape. The cylindrical portion is formed to have a smaller diameter than the inner surface of the stud hole 42d, and is arranged along the concave side surface 2Ac on the outside of the tubular portion of the first member 2A. At the upper end of the cylindrical portion of the second member 2B, a receiving surface 2Bb which is continuous in an annular shape is formed so as to face upward. 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 arranged outside the tubular portion of the first member 2A. The seal ring 3 has an inner surface 3a that abuts on the outer concave side surface 2Ac of the cylindrical portion of the first member 2A. Further, the seal ring 3 is formed with an annularly continuous recess 3b on the inner surface 3a. Further, the seal ring 3 has an upper surface 3c forming a tapered surface that is continuous in an annular shape 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 forming a tapered surface that is continuous in an annular shape 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 such that the outer peripheral surface 3e does not come into contact with the inner surface of the stud hole 42d in a state where a compressive force is not applied from the outside (a reduced diameter state in which the compressive force is minimized 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 gentle curved surface that bulges outward to the extent that it approximates a straight 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 the plug body 2 is inserted into the stud hole 42d or when the plug body 2 is removed from the stud hole 42d. With the 2 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 scaling means 4 separates the first member 2A and the second member 2B forming the plug main body 2 from each other to separate 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 compressive force on the seal ring 3 arranged between the receiving surfaces 2Ad and 2Bb, the seal ring 3 can be made into a 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 of, and the diameter is reduced. On the other hand, the scaling means 4 brings the receiving surface 2Ad of the first member 2A and the receiving surface 2Bb of the second member 2B close to each other by bringing the first member 2A and the second member 2B forming the plug main body 2 close to each other. , Applying a compressive force to the seal ring 3 arranged between the receiving surfaces 2Ad and 2Bb while restricting the inward movement of the seal ring 3 by the concave side surface 2Ac on the outer side of the tubular portion of the first member 2A. Then, the seal ring 3 is enlarged in diameter 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 index portion 4G.

The rotating shaft 4A is rotatably provided around an axis C that penetrates the first member 2A and the second member 2B at the center of each other's disk shape and penetrates at the center of each other's disk shape. Specifically, the rotating shaft 4A includes a rotating shaft portion 4Aa, a male screw portion 4Ab, and a head portion 4Ac. The rotary shaft 4A is rotatably inserted into the 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 the female screw hole 2Bc formed in the second member 2B. The male screw portion 4Ab and the female screw hole 2Bc screwed to each other are configured as a moving portion that relatively moves the first member 2A and the second member 2B relatively close to each other as the rotating shaft 4A rotates. The head portion 4Ac is integrally formed with the rotary shaft portion 4Aa on the opposite side of the male screw portion 4Ab in the extending direction of the axis C. Further, the head portion 4Ac is formed in a cylindrical shape having a diameter larger than that of the rotating shaft portion 4Aa, and constitutes a step portion for preventing the first member 2A from coming off. Further, the head portion 4Ac is housed in a recess 2Af formed by being recessed in the center of a disk shape on the surface 2Aa of the first member 2A. The through hole 2Ae of the first member 2A is formed to penetrate the bottom surface of the recess 2Af, and the head portion 4Ac is in contact with the bottom surface of the recess 2Af so that the rotary shaft portion 4Aa penetrates the through hole 2Ae. Support with. Further, the head 4Ac is provided with an operation pin 4Ad protruding from the outer periphery thereof. The operation pins 4Ad are provided at four locations on the outer circumference of the head 4Ac at 90-degree intervals around the axis C. Then, by operating the operation pin 4Ad, the rotary shaft portion 4Aa of the rotary shaft 4A is rotated around the axis C, and the first member 2A and the second member 2B are screwed by 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 rotary shaft 4A (the tip of the male screw portion 4Ab) that penetrates the second member 2B, and supports the rotary shaft 4A from coming off from the second member 2B. The mounting bolt 4C is provided alone on the axis C, and the support member 4B is detachably fixed to the rotating shaft 4A.

The support member 4B is formed in a disk shape having a flat upper surface 4Ba along a flat inner surface 2Ba and a similarly flat lower surface 4Bb in the second member 2B. The lower surface 4Bb of the support member 4B is the innermost surface of the plug 1 arranged on the hole bottom side of the stud hole 42d, and is a surface having the maximum area as a surface facing the hole bottom side of the stud hole 42d. Further, the support member 4B has a fitting recess 4Bd in which the housing recess 4Bc in which the head portion 4Ca of the mounting bolt 4C is accommodated and the fitting projection 4Ae formed at the tip of the male screw portion 4Ab of the rotary shaft 4A are fitted. And have. Therefore, in the support member 4B, the head portion 4Ca of the mounting bolt 4C does not protrude from the lower surface 4Bb. Further, the support member 4B is restricted from rotating relative to the rotating shaft 4A about the mounting bolt 4C by fitting the fitting recess 4Bd into the fitting projection 4Ae. Further, the support member 4B is formed with a plurality of through holes 4Be. The through holes 4Be have a circular shape in the present embodiment, and are provided at four locations at intervals of 90 degrees around the axis C. Further, the support member 4B is provided with a recess between the through holes 4Be from the upper surface 4Ba, whereby a hook portion 4Bf is formed so as to be always separated from the inner surface 2Ba of the second member 2B and to be hooked or the like. ing.

The fixing pin 4D is provided in the second member 2B so as to extend in parallel with the axis C toward the first member 2A. Further, the fixing pin 4D is inserted so as to be movable in the extending direction with respect to the hole portion 2Ag provided in the first member 2A. Therefore, in the state where the fixing pin 4D is inserted into the hole 2Ag, the first member 2A and the second member 2B allow the first member 2A and the second member 2B to move along the extending direction of the axial center C, while the first member 2A and the second member 2B are inserted. It regulates that 2B and 2B rotate relative to the axis C. 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 portion 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 between them.

The defining portion 4F defines the reduced diameter state and the expanded diameter state of the seal ring 3. The diameter reduction 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 on the inner surface of the stud hole 42d. It is in a state where the outer diameter does not come into contact. In the expanded state of the seal ring 3, the seal ring 3 is expanded in diameter larger than the inner diameter of the stud hole 42d against its own elastic force by applying a compressive force from the outside, and the outer peripheral surface 3e is the inner surface of the stud hole 42d. It is in a state of being pressed against. In the present embodiment, the defining portion 4F defines the diameter-reduced state and the diameter-expanded 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 (diameter expansion state) between the first member 2A and the second member 2B, so that the first member 2A and the second member 2B are combined with each other. The abutting portions (faces) 2Ai and 2Bi that are arranged so as 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 reduction state) between the first member 2A and the second member 2B, so that the inner surface 2Ba of the second member 2B and the upper surface of the support member 4B are defined. It is provided so that it abuts against 4Ba.

The index unit 4G indicates whether or not it is sealed by the seal ring 3. In the present embodiment, as shown in FIGS. 4 and 7, the index unit 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 unit 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. Further, as shown in FIGS. 4 and 7, in the index unit 4G, a predetermined angle range centered on the axis C is marked on the surface 2Aa of the first member 2A by two grooves 2Aj. Then, as shown in FIG. 7, when the operation pin 4Ad and the groove 4Af marked with a mark are located between the ranges of the two grooves 2Aj, the first member 2A and the second member 2B are close to each other. It indicates that the abutting portions (faces) 2Ai and 2Bi, which are the regulation 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 to be sealed. That is, the index unit 4G can visually check whether or not it is sealed by the seal ring 3. The mark of the operation pin 4Ad and the groove 4Af may have at least one of them.

The scaling means 4 is not limited to the above configuration. For example, instead of forming the plug body 2 with the first member 2A and the second member 2B, the seal ring 3 is expanded from the inside by the abutting portion to expand the diameter, while the pushing force of the abutting portion is loosened to seal. It may be a mechanism (cam mechanism or actuator mechanism) that causes the diameter of the ring 3 to be reduced by its own elastic force.

As shown in FIG. 8, the plug 1 shown in FIGS. 3 to 8 simply removes the mounting bolt 4C from the rotating shaft 4A, and the rotating shaft 4A is removed from the first member 2A, the second member 2B, and the support member 4B. 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 attachment / detachment jig according to the present embodiment. FIG. 10 is a partially enlarged perspective view of the plug attachment / detachment jig according to the present embodiment. FIG. 11 is a perspective view showing a plugging plug mounting method according to the present embodiment. FIG. 12 is a perspective view showing a plugging plug mounting method according to the present embodiment. FIG. 13 is a perspective view showing a plugging plug mounting method according to the present embodiment.

As shown in FIG. 9, the plug attachment / detachment jig of the present embodiment includes a rotation regulating jig (regulating portion) 5 and a rotation operating jig 6.

In the above-mentioned plug 1, 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 are fitted to each other. .. Then, in order to prevent rust on the side surface 2Ab of the first member 2A, a rust preventive agent (for example, silicone grease) is applied to the side surface 2Ab. Then, when the diameter of the seal ring 3 is expanded, the rotary operation tool 6 rotates the rotary shaft 4A via the operation pin 4Ad, and at this time, a lubricating action is generated in which the rust preventive agent rotates the first member 2A. Therefore, when the rotating shaft 4A is rotated to expand the diameter of the seal ring 3, the rotation regulating jig 5 regulates the rotation of the first member 2A.

As shown in FIG. 9, the rotation regulating jig 5 includes a regulating 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, are arranged along the upper surface and the side surface of the upper lid 43 of the reactor vessel 42. The restricting portion main body 5A is formed of a cylindrical steel material so that the upper and lower sides can be opened so that the rotation operation jig 6 can be inserted. The restricting portion main body 5A has a plurality of notch holes 5Aa formed in the cylindrical side portion, and the weight of the rotation regulating jig 5 as a whole is reduced. The locking pins 5B are provided at the cylindrical tip of the regulating portion main body 5A, are provided so as to project from the tip, and are provided at least two. The rotation prevention portion 5C is a steel material formed in an L shape having a cylindrical tip extending outward from the upper portion of the regulation portion main body 5A in the radial direction and having a tip bent downward. The tilt prevention unit 5D is located at a position above the regulation unit main body 5A and below the rotation prevention unit 5C, and has a plurality of contradictory radial outer directions of the regulation unit body 5A (four directions in the present embodiment). It is something that stands out. In the tilt prevention portion 5D, urethane rubber is mounted around a bolt (not shown) protruding outward in the radial direction of the tubular shape of the regulation portion main body 5A. As shown in FIGS. 11 and 12, when the plug 1 is attached to the stud hole 42d, the rotation control jig 5 is inserted into the attachment hole 43a formed in the upper lid 43 of the reactor vessel 41 except for the rotation prevention portion 5C. At this time, the tilt preventing portion 5D comes into contact with the inner surface of the mounting hole 43a to prevent the rotation restricting jig 5 from tilting diagonally inside the mounting hole 43a. With respect to the rotation-regulating jig 5, the first member 2A of the plug body 2 in the plug 1 has a locking hole 2Ak formed on the surface 2Aa of which the locking pin 5B is locked. The rotation operation jig 6 is rotated while the locking pin 5B is inserted into the locking hole 2Ak of the first member 2A and locked. At that time, if the stopper main body 2 is rotated along with the rotation operation of the rotation operation jig 6, the rotation operation of the rotation prevention portion 5C is restricted by the corner portion 43b of the upper lid 43, and thereafter, the rotation operation is cured. It is possible to regulate the rotation of the stopper body 2 accompanying the rotation operation of the tool 6, and it is possible to rotate only the rotation shaft 4A of the expansion / contraction means 4.

As shown in FIG. 9, the rotation 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 6A is formed in a cylindrical shape in which the lower part is open and the upper part is closed. The operation unit main body 6A has an outer diameter that can be inserted into the recess 2Af of the first member 2A in the plug 1 described above in a cylindrical shape, and the head portion 4Ac of the rotation shaft 4A of the expansion / contraction means 4 is inserted. It has an inner diameter that can be used. Further, the operation portion main body 6A is formed with an engagement groove (engagement portion) 6Aa that engages with the operation pin 4Ad of the rotation shaft 4A of the expansion / contraction means 4 on the lower open edge. The number of engaging grooves 6Aa is provided according to the number of each operating pin 4Ad (4 locations in this embodiment). The engagement groove 6Aa is a groove that opens downward so as to cover the operation pin 4Ad from above when the operation unit main body 6A is moved downward, and pushes the operation pin 4Ad both around the axis C to rotate the shaft. It has an engaging edge 6Aaa facing both sides around the axis C so that 4A can rotate. Further, the first member 2A and the second member 2B are relatively separated from each other to rotate the seal ring 3 in the rotation direction (direction of arrow R1 in FIG. 10) for reducing the diameter of the seal ring 3 by its own elastic force. The engaging edge 6Aaa on the side where the shaft 4A is rotated is provided with a hook portion (engaging portion) 6Aab which is inserted under the operation pin 4Ad and holds the engaged state of the engaging groove 6Aa.

As shown in FIG. 9, the operation rod 6B is provided extending upward from the center of the cylindrical shape on the closed upper surface of the operation unit main body 6A. As shown in FIG. 9, the operation handle 6C is provided so as to extend to both sides at the upper end portion of the operation rod 6B, and is grasped by the operator by hand to rotate the operation rod 6B together with the operation unit main body 6A. This is for the purpose, and the form thereof is not particularly limited.

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

In connecting the plug attachment / detachment jig to the plug 1 as shown in FIG. 9, the operator first lifts and moves the regulation portion main body 5A of the rotation control jig 5, and the locking pin 5B is plugged in the plug 1. It is inserted into the locking hole 2Ak of the first member 2A of the main body 2. Next, the operator grasps the operation rod 6B of the rotation operation jig 6 by hand, lifts and moves the operation rod 6B, and inserts the operation rod 6B together with the operation unit main body 6A into the regulation portion main body 5A of the rotation regulation jig 5 from above. Then, the engaging groove 6Aa of the operating portion main body 6A is engaged with the operating pin 4Ad of the rotating shaft 4A in the plug 1. At this time, as shown in FIG. 10, the rotation direction (arrow) of the rotating shaft 4A for relatively separating the first member 2A and the second member 2B to reduce the diameter of the seal ring 3 by its own elastic force. By rotating the operation unit main body 6A via the operation rod 6B in the R1 direction), the hook portion 6Aab is inserted under the operation pin 4Ad. As a result, the hook portion 6Ab is caught by the operation pin 4Ad, and the plug 1 can be lifted by the rotation operation jig 6 via the operation pin 4Ad. The rotation control 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 left as shown in FIG. Then, the plug 1 is inserted from the mounting hole 43a of the upper lid 43 through which the stud bolt 44 is inserted via the rotation operation jig 6 together with the rotation control jig 5, and the plug 1 is installed in the stud hole 42d.

Next, the operator hooks the rotation prevention part 5C of the rotation control tool 5 on the corner portion 43b of the upper lid 43 of the reactor container 41, so that the rotation control tool 5 itself and the plug 1 are subjected to the rotation operation of the rotation control tool 6. As shown in FIG. 13, the operation rod 6B of the rotation operation tool 6 is grasped by hand and the operation rod 6B is rotated together with the operation unit main body 6A while restricting the rotation. The rotation direction of the operation unit main body 6A is the rotation direction (arrow R2 direction) of the rotation shaft 4A for expanding the diameter of the seal ring 3 by bringing the first member 2A and the second member 2B relatively close to each other. Then, as shown in FIG. 6, when the rotation shaft 4A is rotated until the abutting portions (planes) 2Ai and 2Bi, which are the mutual defining portions 4F of the first member 2A and the second member 2B, abut each other, the seal ring 3 is released. The diameter is expanded and abuts on the inner surface of the stud hole 42d. At this time, the work supervisor visually confirms that the operation pin 4Ad forming the index portion 4G is located between the ranges of the two grooves 2Aj of the surface 2Aa of the first member 2A and is sealed by the seal ring 3. It can be confirmed (see Fig. 7). Further, the rotation direction of the rotating shaft 4A for expanding the diameter of the seal ring 3 is the direction in which the hook portion 6Ab comes out from the lower side of the operation pin 4Ad, and the rotating shaft 4A is moved until the seal ring 3 is in the expanded state. After rotating in the direction of the arrow R2, the operation rod 6B of the rotation operation jig 6 is grasped by hand and the operation rod 6B is lifted upward together with the operation unit main body 6A so that the engagement groove 6Aa of the operation unit main body 6A becomes the operation pin 4Ad. The rotation operation jig 6 can be easily removed from the expansion / contraction means 4 of the plug 1. Further, since the locking pin 5B is disengaged from the locking hole 2Ak by lifting the restricting portion main body 5A of the rotation regulating jig 5, the rotation regulating jig 5 can be removed from the plug 1 together with the rotation operating jig 6.

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

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

As described above, the plug 1 of the present embodiment has a 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. When inserting the seal ring 3 formed in an annular shape along the outer circumference of the seal ring 3, the contact portion (concave side surface 2Ac) arranged so as to abut on the inside of the seal ring 3, and 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 diameter of the seal ring 3 is expanded with the stopper body 2 inserted into the stud hole 42d. A scaling means 4 for pressing against the inner surface of the stud hole 42d is provided.

According to this plug 1, when the plug body 2 is inserted into the stud hole 42d, the seal ring 3 is supported by the expansion / contraction means 4 in a reduced diameter state smaller than the inner diameter of the stud hole 42d, and the plug body 2 is supported by the stud hole. Since the seal ring 3 is expanded in diameter and pressed against the inner surface of the stud hole 42d while being inserted into the 42d, the air inside the stud hole 42d is not compressed at the time of installation unlike the conventional plug, and the compressed air is compressed after the installation. It is possible to prevent the plug 1 from being lifted due to the influence of the above. Moreover, since the contact portion (concave side surface 2Ac) abuts on 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 expanded. Therefore, it is possible to suppress the generation of rust due to the infiltration of water 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.

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

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

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

According to this plug 1, the outer peripheral surface 3e 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 enlarged seal ring 3 contacts the inner surface of the stud hole 42d. As a result, stable sealing performance can be obtained even if the inner surface of the stud hole 42d is finely scratched.

Further, in the plug 1 of the present 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 this plug 1, by defining the reduced diameter state and the expanded diameter state of the seal ring 3 by the defining portion 4F, the seal ring 3 can be reliably attached to and detached from the stud hole 42d, and the sealing performance can be surely obtained. Can be done.

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

According to this plug 1, it is possible to visually confirm that the sealing performance is obtained by the index unit 4G.

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

According to this plug 1, since the upper surface (surface 2Aa) and the surface on the bottom side of the hole (lower surface 4Bb) of the plug body 2 are formed flat, a plurality of plugs 1 can be stacked and narrow storage. A plurality of plugs 1 can be stored even in a place.

Further, in the plug 1 of the present embodiment, it is desirable that the plug main body 2 has a hooking portion 4Bf at a portion arranged on 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 42d by the hooking portion 4Bf. As a result, it is possible to suppress the occurrence of rust in the hole of the stud hole 42d.

Further, in the plug 1 of the present embodiment, the plug main body 2 is arranged on the first member 2A appearing on the opening side of the stud hole 42d and on the hole bottom side of the stud hole 42d in a state of being inserted into the stud hole 42d. The seal ring 3 is provided sandwiched 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 the axis C, 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 relatively close to each other as the rotating shaft 4A rotates. It is desirable that the abutting portion (concave side surface 2Ac) including the female screw hole 2Bc) 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 diameter of the seal ring 3 is expanded by rotating the rotating shaft 4A from the outside of the first member 2A, while the diameter is reduced to the stud hole 42d. Can be easily attached and detached.

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

According to this plug 1, the O-ring 4E provided for ensuring the sealing performance between the rotating shaft 4A and the first member 2A is arranged between the facing surfaces orthogonal to the axis C and facing each other. Therefore, the O-ring 4E can be easily attached and detached as compared with the form of winding 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) for preventing the first member 2A from coming off on one end side of the rotating shaft 4A, while the other end side of the rotating shaft 4A. It is desirable that the support member 4B for preventing the second member 2B from coming off is fixed to the rotating shaft 4A with a detachable mounting bolt 4C.

According to this plug 1, the support member 4B is removed from the rotary shaft 4A by removing the mounting bolt 4C, the rotary shaft 4A is pulled out from the first member 2A and the second member 2B, and the first member 2A and the second member 2B are removed. Can be separated and the seal ring 3 can be removed. As a result, the maintainability of the seal ring 3 can be improved.

The plug attachment / detachment jig of the present embodiment has a plug body 2 formed 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 a plug body 2 along the outer periphery of the plug body 2. A seal ring 3 formed in an annular shape, a contact portion (concave side surface 2Ac) arranged so as to abut on the inside of the seal ring 3, and when the stopper body 2 is inserted into the stud hole 42d or the stopper body 2 is studded. When removing 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. Engagement with an engaging portion (engagement groove 6Aa) that engages with the expansion / contraction means 4 of the plug 1 and maintains the engaged state, which is a attachment / detachment jig for the plug 1 having the expansion / contraction means 4 pressed against the plug 1. An operation portion (operation rod 6B) for operating the expansion / contraction means 4 via the portion (engagement groove 6Aa) is provided.

According to this plug plug attachment / detachment jig, the engaging portion (engagement groove 6Aa) engages with the expansion / contraction means 4 of the plug plug 1 to maintain the engaged state, so that the expansion / contraction means 4 is operated by the operation unit (operation rod 6B). ), And the plug 1 can be installed or removed from the stud hole 42d via the operation unit (operation rod 6B).

Further, in the plug attachment / detachment jig of the present embodiment, the plug main body 2 is arranged on the first member 2A appearing on the opening side of the stud hole 42d and on the hole bottom side of the stud hole 42d in a state of being inserted into the stud hole 42d. The seal ring 3 is provided sandwiched 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 rotatably provided around the penetrating axis C, and a moving portion (male screw portion 4Ab) that relatively approaches and separates the first member 2A and the second member 2B as the rotating shaft 4A rotates. And a 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 rotation shaft 4A is rotatably provided via the (engagement groove 6Aa), and the regulation portion (rotation regulation jig 5) that regulates the rotation of the first member 2A when the rotation shaft 4A is rotated by the operation portion (operation rod 6B). ) Is more desirable.

According to this plug-on plug attachment / detachment jig, a regulation unit (rotation regulation jig 5) is further provided, and the rotation of the first member 2A is restricted when the rotation shaft 4A is rotated by the operation unit (operation rod 6B). It can be surely installed or removed in the stud hole 42d of No. 1.

In the method of attaching the plug to be plugged in the present embodiment, the plug body 2 is formed to have 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 is formed along the outer periphery of the plug body 2. The seal ring 3 formed in an annular shape, the contact portion (concave side surface 2Ac) arranged so as to abut on the inside of the seal ring 3, and when the stopper body 2 is inserted into the stud hole 42d or the stopper body 2 is studded. When removing 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. An engaging portion (engagement groove 6Aa) and an engaging portion (engagement) that engage with the expansion / contraction means 4 for pressing the expansion / contraction means 4 and hold the engagement state. A plugging plug attaching method using an operating portion (operating rod 6B) for operating the scaling means 4 via the groove 6Aa) and a plugging plug attachment / detachment jig including the engaging portion (engaging groove 6Aa). The plug body 2 is moved to the stud hole 42d together with the engaging portion (engagement groove 6Aa) in a form of engaging with 4 and the engaging state is maintained, and the operation unit is in a state where the plug body 2 is inserted into the stud hole 42d. (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 (engagement groove 6Aa) is removed from the expansion / contraction means 4.

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

In the method of removing the plug of the plug of the present embodiment, the plug main body 2 is formed so as to be inserted into the stud hole 42d to be plugged so as to have an outer shape along the inner surface of the stud hole 42d, and the plug main body 2 is formed along the outer periphery of the plug main body 2. A seal ring 3 formed in an annular shape, a contact portion (concave side surface 2Ac) arranged so as to abut on the inside of the seal ring 3, and when the stopper body 2 is inserted into the stud hole 42d or the stopper body 2 is inserted. 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. A plug 1 having an expansion / contraction means 4 pressed against an inner surface, an engaging portion (engagement groove 6Aa) that engages with the expansion / contraction means 4 of the plug 1 to maintain an engaged state, and an engaging portion (engagement). A plug plug removal method using an operation unit (operation rod 6B) for operating the expansion / contraction means 4 via the groove 6Aa) and a plug plug attachment / detachment jig provided with the plug body 2 inserted into the stud hole 42d. From the state where the seal ring 3 is expanded in diameter and pressed against the inner surface of the stud hole 42d, the engaging portion (engagement groove 6Aa) is engaged with the expansion / contraction means 4 and the engaged state is maintained. After operating the rod 6B) to support the seal ring 3 in a reduced diameter state smaller than the inner diameter of the stud hole 42d, the stopper body 2 is removed from the stud hole 42d together with the engaging portion (engagement groove 6Aa), and then engaged. The portion (engagement groove 6Aa) is removed from the scaling means 4.

According to this plugging plug removing method, the diameter of the seal ring 3 is smaller than the inner diameter of the stud hole 42d in a form in which the engaging portion (engagement groove 6Aa) is engaged with the expansion / contraction means 4 and the engaged state is maintained. 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 work of removing the plug 1 to the stud hole 42d can be easily performed.

In the plugging plug maintenance method of the present embodiment, the plug body 2 is formed to have 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 is formed along the outer periphery of the plug body 2. A seal ring 3 formed in an annular shape, a contact portion (concave side surface 2Ac) arranged so as to abut on the inside 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 removing 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. The plug main body 2 is provided with the expansion / contraction means 4 to be pressed against the stud hole 42d, and the stopper body 2 is arranged on the hole bottom side of the stud hole 42d and the first member 2A appearing on the opening side of the stud hole 42d. The seal ring 3 including the second member 2B is provided so as to be sandwiched 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 the axis C, and a moving portion (male screw portion 4Ab and female) that moves the first member 2A and the second member 2B relatively close to each other as the rotating shaft 4A rotates. The scaling means 4 includes a screw hole 2Bc) and has a step portion (head 4Ac) for preventing the first member 2A from coming off on one end side of the rotary shaft 4A, while the second expansion / contraction means 4 is on the other end side of the rotary shaft 4A. It is a maintenance method of the plug 1 in which the support member 4B for preventing the member 2B from coming off is fixed to the rotary shaft 4A with the detachable mounting bolt 4C, and the mounting bolt 4C and the support member 4B are removed from the rotary shaft 4A. After removing the second member 2B from the rotating shaft 4A and replacing the seal ring 3, the second member 2B is attached to the rotating shaft 4A, and the support member 4B and the mounting bolt 4C are attached to the rotating shaft 4A.

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

Further, in the plugging plug maintenance method of the present embodiment, the rotating shaft 4A and the first member 2A each have facing faces orthogonal to the axis C and facing each other, and an annular shape is formed around the axis C between the facing faces. The O-ring 4E arranged in the rotary shaft 4A is provided, the mounting bolt 4C and the support member 4B are removed from the rotary shaft 4A, the second member 2B is removed from the rotary shaft 4A, and the seal ring 3 is removed, and the first is removed from the rotary shaft 4A. The member 2A is removed and the O-ring 4E is removed, the O-ring 4E is replaced to attach the first member 2A to the rotating shaft 4A, the seal ring 3 is replaced to attach the second member 2B to the rotating shaft 4A, and the rotating shaft 4A is attached. The support member 4B and the mounting bolt 4C are attached to.

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

1 Plugging plug 2 Plug body 2A First member 2Aa Surface 2Ab Side surface 2Ac Concave side surface 2Ad Receiving surface 2Ae Through hole 2Af Recess 2Ag Hole part 2Ah Circular groove 2Ai Butt part 2Aj Groove 2Ak Locking hole 2B Second member 2B Inner surface 2Bb 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 rotation shaft 4Aa rotation shaft part 4Ab male screw part 4Ac head 4Ad operation pin 4Ae fitting protrusion 4B support Bottom surface 4Bc Storage recess 4Bd Fitting recess 4Be Through hole 4Bf Hooking part 4C Mounting bolt 4Ca Head 4D Fixing pin 4EO ring 4F Regulation part 4G Indicator part 5 Rotation regulation jig 5A Restriction part body 5Aa Notch hole 5B Locking pin 5C Rotation prevention part 5D Tilt prevention part 6 Rotation operation jig 6A Operation part main body 6Aa Engagement groove 6Aaa Engagement edge 6Aab Hook part 6B Operation rod 6C Operation handle 42d Stud hole 42da Flat part 42db Inner surface C axis

Claims (14)

A plug body formed with an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged, and a plug body.
A seal ring formed in an annular shape along the outer circumference of the stopper body,
An abutting portion arranged so as to abut on the inside of the seal ring,
When the plug body is inserted into the hole or when the plug body 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 plug body is inserted into the hole. The expansion / contraction means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole.
Equipped with
The plug body includes a first member that appears on the opening side of the hole and a second member that is arranged on the bottom side of the hole when inserted into the hole.
The seal ring is provided so as to be sandwiched between the first member and the second member.
The scaling means includes a rotating shaft rotatably provided around the axis penetrating the first member and the second member, and the first member and the second member as the rotating shaft rotates. Including a moving part that moves relatively close and separated along the axis,
The contact portion is fixed to either the first member or the second member.
The rotating shaft and the first member each have facing surfaces facing each other in the extending direction of the axis, and an O-ring arranged in an annular shape around the axis is provided between the facing surfaces. Plug plug. The plug body 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. 2. The plug described in. The plug according to any one of claims 1 to 3, wherein the seal ring has a flat surface on its outer peripheral surface in the reduced diameter state. The plug according to any one of claims 1 to 4, wherein the expansion / contraction means has a defining portion that defines the diameter-reduced state and the diameter-expanded state of the seal ring. The plug according to any one of claims 1 to 5, wherein the plug body has an index unit that allows visual inspection as to whether or not the plug is sealed by the seal ring. Any one of claims 1 to 6 in which the upper surface of the plug body that appears on the opening side of the hole and the surface of the hole bottom side that is arranged on the hole bottom side opposite to the upper surface are formed flat. The plug described in one. The plug according to any one of claims 1 to 7, wherein the plug body has a hooking portion at a portion arranged on the bottom side of the hole. The expansion / contraction means has a step portion for preventing the first member from coming off on one end side of the rotating shaft, while a support member for preventing the second member from coming off is attached to and detached from the rotating shaft on the other end side of the rotating shaft. The plug according to any one of claims 1 to 8, which is fixed with a possible mounting bolt. The rotating shaft is rotatably provided around the axis with respect to the first member, and the moving portion is screwed into the second member to cause the second member to rotate as the rotating shaft rotates. The plug according to any one of claims 1 to 9, wherein the plug is relatively close to and separated from the first member along the axis. A plug body formed with an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged, and a plug body.
A seal ring formed in an annular shape along the outer circumference of the stopper body,
An abutting portion arranged so as to abut on the inside of the seal ring,
When the plug body is inserted into the hole or when the plug body 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 plug body is inserted into the hole. The expansion / contraction means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole.
Equipped with
The plug body includes a first member that appears on the opening side of the hole and a second member that is arranged on the bottom side of the hole when inserted into the hole.
The seal ring is provided so as to be sandwiched between the first member and the second member.
The scaling means includes a rotating shaft rotatably provided around the axis penetrating the first member and the second member, and the first member and the second member as the rotating shaft rotates. Including a moving part that moves relatively close and separated along the axis,
The contact portion is fixed to either the first member or the second member.
The rotating shaft and the first member each have facing surfaces facing each other in the extending direction of the axis, and an O-ring arranged in an annular shape around the axis is provided between the facing surfaces. It is a jig for attaching and detaching the plug,
An engaging portion that engages with the expanding / contracting means of the plug and maintains the engaged state, and
An operation unit that operates the expansion / contraction means via the engagement portion, and
The engaging portion engages with the rotating shaft to maintain the engaged state.
The operating portion is provided so that the rotating shaft can be rotated via the engaging portion.
A plug attachment / detachment jig further comprising a regulating portion that regulates the rotation of the first member when the rotating shaft is rotated by the operating portion. A plug body formed with an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged, and a plug body.
A seal ring formed in an annular shape along the outer circumference of the stopper body,
An abutting portion arranged so as to abut on the inside of the seal ring,
When the plug body is inserted into the hole or when the plug body 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 plug body is inserted into the hole. The expansion / contraction means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole.
Equipped with
The plug body includes a first member that appears on the opening side of the hole and a second member that is arranged on the bottom side of the hole when inserted into the hole.
The seal ring is provided so as to be sandwiched between the first member and the second member.
The scaling means includes a rotating shaft rotatably provided around the axis penetrating the first member and the second member, and the first member and the second member as the rotating shaft rotates. Including a moving part that moves relatively close and separated along the axis,
The contact portion is fixed to either the first member or the second member.
The rotating shaft and the first member each have facing surfaces facing each other in the extending direction of the axis, and an O-ring arranged in an annular shape around the axis is provided between the facing surfaces. Plug plug,
In addition, an engaging portion that engages with the expansion / contraction means of the plug and maintains the engaged state, and
An operation unit that operates the expansion / contraction means via the engagement portion, and
With plug attachment / detachment jig,
It is a plug plug mounting method using
The operation is carried out in a state where the plug body is moved to the hole together with the engaging portion in a form in which the engaging portion is engaged with the expansion / contraction means and the engaged state is maintained, and the plug body is inserted into the hole. A plugging plug mounting method for removing the engaging portion from the scaling 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 with an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged, and a plug body.
A seal ring formed in an annular shape along the outer circumference of the stopper body,
An abutting portion arranged so as to abut on the inside of the seal ring,
When the plug body is inserted into the hole or when the plug body 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 plug body is inserted into the hole. The expansion / contraction means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole.
Equipped with
The plug body includes a first member that appears on the opening side of the hole and a second member that is arranged on the bottom side of the hole when inserted into the hole.
The seal ring is provided so as to be sandwiched between the first member and the second member.
The scaling means includes a rotating shaft rotatably provided around the axis penetrating the first member and the second member, and the first member and the second member as the rotating shaft rotates. Including a moving part that moves relatively close and separated along the axis,
The contact portion is fixed to either the first member or the second member.
The rotating shaft and the first member each have facing surfaces facing each other in the extending direction of the axis, and an O-ring arranged in an annular shape around the axis is provided between the facing surfaces. Plug plug,
In addition, an engaging portion that engages with the expansion / contraction means of the plug and maintains the engaged state, and
An operation unit that operates the expansion / contraction means via the engagement portion, and
With plug attachment / detachment jig,
It is a method of removing the plug using
From the state in which the plug body is inserted into the hole to expand the diameter of the seal ring and press it against the inner surface of the hole, the engaging portion is engaged with the expansion / contraction means to maintain the engaged state. After operating the operating 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 engaging portion, and then the engaging portion is removed from the scaling means. How to remove the plug. A plug body formed with an outer shape along the inner surface of the hole so as to be inserted into the hole to be plugged, and a plug body.
A seal ring formed in an annular shape along the outer circumference of the stopper body,
An abutting portion arranged so as to abut on the inside of the seal ring,
When the plug body is inserted into the hole or when the plug body 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 plug body is inserted into the hole. The expansion / contraction means for expanding the diameter of the seal ring and pressing it against the inner surface of the hole.
Equipped with
The plug body includes a first member that appears on the opening side of the hole and a second member that is arranged on the bottom side of the hole when inserted into the hole.
The seal ring is provided so as to be sandwiched between the first member and the second member.
The scaling means includes a rotating shaft rotatably provided around the axis penetrating the first member and the second member, and the first member and the second member as the rotating shaft rotates. Including a moving part that moves relatively close and separated along the axis,
The contact portion is fixed to either the first member or the second member.
The rotating shaft and the first member each have facing surfaces facing each other in the extending direction of the axis, and an O-ring arranged in an annular shape around the axis is provided between the facing surfaces. ,
The expansion / contraction means has a step portion for preventing the first member from coming off on one end side of the rotating shaft, while the rotating shaft has a support member for preventing the second member from coming off on the other end side of the rotating shaft. It is a maintenance method of the plug that is fixed with the attachment and detachable mounting bolts.
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 removed, the first member is removed from the rotating shaft and the O-ring is removed, and the O-ring is removed. A plug maintenance method in which 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.

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