JP2013249595A - Demolition method for concrete structure inside nuclear reactor containment vessel and demolition device for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a demolition method for a concrete structure inside a nuclear reactor containment vessel and a demolition device for the same capable of reliably demolishing and removing the concrete structure of a pedestal and a reactor shielding wall by remote control even when an inside of the nuclear reactor containment vessel is contaminated at a high level.SOLUTION: A demolition method for a concrete structure inside a nuclear reactor containment vessel comprises: a working floor assembling process to assemble a working floor 15 having a radius smaller than the radius of a concrete structure 1 on an operation floor 5 above a nuclear reactor containment vessel A; a working floor suspending facility installation process to install a work floor suspending facility 16 which supports the working floor 15 by suspending the same so as to be movable between the operation floor 5 and an inside of the concrete structure 1; a working floor installation process to install the working floor 15 at a predetermined position inside the concrete structure 1; a demolition device installation process to install a demolition device 22 on the working floor 15; and a concrete structure demolition process to demolish the concrete structure 1 from an upper edge section thereof with the remotely controlled demolition device 22.

Description

  The present invention relates to a method and an apparatus for dismantling a concrete structure in a reactor containment vessel.

  For example, a nuclear power plant is configured by storing a reactor pressure vessel (RPV) for storing a reactor and piping connected to the reactor in a reactor containment vessel. The reactor containment vessel has a cylindrical pedestal (reactor body foundation) for installing and supporting the RPV, and a cylindrical reactor shielding wall disposed so as to surround the RPV by connecting the lower end to the pedestal. (RSW) (see, for example, Patent Document 1).

  Conventionally, reactor containment vessels constructed of reinforced concrete with pedestals and reactor shielding walls have been used frequently. When a nuclear power plant equipped with this type of reactor containment vessel is abolished, pedestals and reactor shielding It is said that the demolition and removal of wall concrete structures is the responsibility of the building.

  For this reason, in Japan, studies have been conducted on methods for dismantling and removing concrete structures such as pedestals and reactor shielding walls. In one proposed method, after removing the top head and various devices such as a reactor pressure vessel and a stabilizer, piping, etc., as shown in FIG. 21, for example, a cylindrical shape of a pedestal 1a and a reactor shielding wall 1b. The post 2 is erected inside the concrete structure 1 and the dismantling device 4 provided with the cutting mechanism 4a and the cutting piece holding mechanism 4b supported by the overhead traveling crane 3 is supported by the post 2 so as to be movable up and down. Then, the pedestal 1a and the reactor shielding wall 1b are cut from the upper end side by the cutting mechanism 4a, the cutting piece is held by the cutting piece holding mechanism, and the cutting piece is moved together with the dismantling device 4 by the overhead traveling crane 3 to the upper operation floor 5 Transport to.

  Further, a space where the concrete structure 1 exists is isolated, an isolation house 6 is provided so that dust and the like are not scattered outside, and a secondary cutting yard 7 is provided on the operation floor 5 in the isolation house 6, The cut pieces are conveyed to the secondary cutting processing yard 7. The secondary cutting processing yard 7 is provided with secondary cutting means 10 such as a turntable 8, a water collecting pan 9, and a wire saw. Then, the cut piece is placed on the turntable 8, the cut piece is shredded by the secondary cutting means 10, the shredded cut piece is stored in a storage container and carried out to the outside. The waste liquid generated by using water at the time of secondary cutting is sent from the water collecting pan 8 to the waste liquid recovery tank 11 and further sent to the waste liquid processing apparatus 12 for processing.

  And again, the dismantling apparatus 4 is lowered to the concrete structure 1 by the overhead traveling crane 3, the upper end side is cut, and the cut piece is conveyed to the secondary cutting processing yard 7. By repeating such an operation, the reactor structure wall 1b to the pedestal 1a are sequentially cut and removed from the upper end side, and the concrete structure 1 is disassembled.

JP 2000-225881 A

  Here, generally, after the reactor pressure vessel is removed at the nuclear power plant, the air dose in the reactor containment vessel is greatly reduced. For this reason, as described above, posts can be installed inside the pedestal and reactor shielding wall without any problems, and then the concrete structure of the pedestal and reactor shielding wall is sequentially dismantled by remotely operating the demolition device and overhead traveling crane. I can go.

  On the other hand, when the reactor containment vessel is contaminated to a high level by FP etc. even after the reactor pressure vessel is removed, as in the Fukushima Daiichi NPS where the reactor pressure vessel has been damaged The post itself becomes difficult to install. For this reason, even when the inside of the reactor containment vessel is contaminated at a high level, there has been a strong demand for a method that can reliably dismantle and remove the concrete structure of the pedestal and the reactor shielding wall by remote control.

  In view of the above circumstances, the present invention can dismantle and remove the concrete structure of the pedestal and the reactor shielding wall by remote control even when the inside of the reactor containment vessel is contaminated at a high level. An object of the present invention is to provide a demolition method and a demolition apparatus for a concrete structure in a reactor containment vessel.

  In order to achieve the above object, the present invention provides the following means.

  A method for dismantling a concrete structure in a reactor containment vessel according to the present invention is a method for dismantling and removing a cylindrical concrete structure in a reactor containment vessel, and an operation provided on the upper side of the reactor containment vessel A work floor construction process for constructing a work floor having a diameter smaller than the inner diameter of the concrete structure on the floor, and the work floor is suspended and supported so as to be movable between the operation floor and the inside of the concrete structure. Work floor suspension equipment installation process for constructing work floor suspension equipment, work floor installation process for disposing the work floor at a predetermined position inside the concrete structure, and dismantling apparatus for disposing the dismantling device on the work floor Concrete in which the concrete structure is demolished from the upper end side by an installation process and the work floor is sequentially lowered and the dismantling device remotely operated Characterized in that it includes a creation dismantling process.

  The method for dismantling a concrete structure in a reactor containment vessel according to the present invention is a method for dismantling and removing a cylindrical concrete structure in a reactor containment vessel, wherein the dismantling device is on the upper end side of the concrete structure. A holding mechanism that integrally holds the dismantling device and the upper end side of the concrete structure so as to be detachably engaged with each other, and the holding mechanism integrally holds the dismantling device and the upper end side of the concrete structure. And a cutting mechanism that is inserted into the concrete structure in a state and is separated from the upper end side of the concrete structure by cutting the concrete structure from the inner surface side in the circumferential direction by remote operation. The dismantling device is suspended by a wire, the holding mechanism is engaged and held on the upper end side of the concrete structure, and the dismantling device is A dismantling device installation step for installing the structure at a predetermined position on the upper end side, a concrete structure cutting and separating step for remotely operating the cutting mechanism to cut and separate the upper end side of the concrete structure, and the dismantling It is characterized in that the concrete structure is sequentially disassembled from the upper side to the lower side by repeatedly performing the cut piece collecting step of lifting and collecting the cut piece of the concrete structure together with the apparatus.

  A demolition device for a concrete structure in a reactor containment vessel according to the present invention is a device for demolition and removal of a cylindrical concrete structure in a reactor containment vessel, and the concrete structure is suspended by a wire. A holding mechanism that integrally holds the dismantling device and the upper end side of the concrete structure so as to be detachably engaged with each other, and the upper end side of the dismantling device and the concrete structure by the holding mechanism. A cutting mechanism that is inserted into the concrete structure in a state of being integrally held, and is separated from the upper end side of the concrete structure by cutting the concrete structure in a circumferential direction from the inner surface side by remote operation; It is characterized by having.

  Further, in the demolition device for a concrete structure in the reactor containment vessel of the present invention, the cutting means provided in the cutting mechanism includes any of a disk cutter, a high-pressure water jet head, a laser head, a core drill, and a wire saw. It is desirable that

  Furthermore, in the demolition device for a concrete structure in the reactor containment vessel of the present invention, a main body unit including the holding mechanism and the cutting mechanism is connected to the wire, and is detachably integrated with the main body unit. It may be configured with a hanging tool.

  Moreover, in the demolition apparatus for a concrete structure in a reactor containment vessel according to the present invention, the main body unit includes a connection panel portion that is detachably connected to the suspension tool, the holding mechanism, and the cutting mechanism. A disassembly mechanism unit, and an expansion / contraction mechanism unit that connects the connection panel unit and the disassembly mechanism unit and connects the disassembly mechanism unit to the connection panel unit so as to be movable in a vertical direction. Also good.

  In the method for dismantling a concrete structure in a containment vessel and the dismantling apparatus for a concrete structure in a containment vessel according to the present invention, the pedestal and the shielding concrete wall are placed inside the cylindrical concrete structure as in the prior art. There is no need to set up a post and dismantling work can be done remotely from the operation floor. Thereby, even when the inside of the reactor containment vessel is contaminated at a high level by FP or the like, the concrete structure can be surely dismantled and removed.

It is a figure which shows the state which has built the work floor in the operation floor in the dismantling method of the concrete structure in the reactor containment vessel which concerns on 1st Embodiment of this invention. It is a figure which shows the state which has constructed | assembled the work floor suspension equipment in the dismantling method of the concrete structure in the reactor containment vessel which concerns on 1st Embodiment of this invention. It is a figure which shows the state which has constructed | assembled the work floor suspension equipment in the dismantling method of the concrete structure in the reactor containment vessel which concerns on 1st Embodiment of this invention. It is a figure which shows the state which has constructed | assembled the work floor suspension equipment in the dismantling method of the concrete structure in the reactor containment vessel which concerns on 1st Embodiment of this invention. It is a figure which shows the state which has constructed | assembled the work floor suspension equipment in the dismantling method of the concrete structure in the reactor containment vessel which concerns on 1st Embodiment of this invention. In the dismantling method for the concrete structure in the reactor containment vessel according to the first embodiment of the present invention, a state in which the work floor is disposed at a predetermined position of the concrete structure and the dismantling robot is remotely operated to perform the dismantling work. FIG. It is a figure which shows the state which has replaced | exchanged the work floor in the dismantling method of the concrete structure in the reactor containment vessel concerning 1st Embodiment of this invention. The figure which shows the state which has arrange | positioned the replaced work floor in the predetermined position in the demolition method of the concrete structure in the reactor containment vessel concerning 1st Embodiment of this invention, and operates the demolition robot remotely and is performing the demolition work It is. It is a figure which shows the state which has replaced | exchanged the work floor in the dismantling method of the concrete structure in the reactor containment vessel concerning 1st Embodiment of this invention. The figure which shows the state which has arrange | positioned the replaced work floor in the predetermined position in the demolition method of the concrete structure in the reactor containment vessel concerning 1st Embodiment of this invention, and operates the demolition robot remotely and is performing the demolition work It is. It is a figure which shows the state which the demolition removal of the concrete structure was completed in the demolition method of the concrete structure in the reactor containment vessel which concerns on 1st Embodiment of this invention. It is a figure which shows the state which has removed the dismantling equipment in the dismantling method of the concrete structure in the reactor containment vessel which concerns on 1st Embodiment of this invention. It is a figure which shows the demolition method and demolition apparatus of the concrete structure in the reactor containment vessel concerning 2nd Embodiment of this invention. It is a figure which shows the dismantling method and the dismantling apparatus of the concrete structure in the reactor containment vessel concerning 2nd Embodiment of this invention, and is a figure which shows the state which has cut | disconnected the nuclear reactor shielding wall. It is a figure which shows the dismantling method and the dismantling apparatus of the concrete structure in the reactor containment vessel concerning 2nd Embodiment of this invention, and is a figure which shows the state which has cut-separated the pedestal. It is a figure which shows the modification of the demolition apparatus of the concrete structure in the reactor containment vessel concerning 2nd Embodiment of this invention. It is a figure which shows the modification of the demolition apparatus of the concrete structure in the reactor containment vessel concerning 2nd Embodiment of this invention, and is a figure which shows the demolition apparatus which applied the high pressure water ejection head (water jet) as a cutting means. . It is a figure which shows the modification of the demolition apparatus of the concrete structure in the reactor containment vessel concerning 2nd Embodiment of this invention, and is a figure which shows the demolition apparatus which applied the laser head (laser irradiation) as a cutting means. It is a figure which shows the modification of the demolition apparatus of the concrete structure in the reactor containment vessel concerning 2nd Embodiment of this invention, and is a figure which shows the demolition apparatus which applied the core drill as a cutting means. It is a figure which shows the modification of the demolition apparatus of the concrete structure in the reactor containment vessel concerning 2nd Embodiment of this invention, and is a figure which shows the demolition apparatus which applied the wire saw as a cutting means. It is a figure which shows the dismantling method of the conventional concrete structure in a reactor containment vessel.

  Hereinafter, with reference to FIGS. 1 to 12, a method for dismantling the concrete structure in the reactor containment vessel according to the first embodiment of the present invention will be described. In particular, the present embodiment relates to a method for demolishing a concrete structure in a reactor containment vessel that enables the concrete structure to be reliably demolished and removed even when contamination occurs at a high level.

  First, as shown in FIG. 1, the reactor containment vessel A of this embodiment has a cylindrical pedestal (reactor body foundation) 1a for installing an RPV (reactor pressure vessel) and a lower end connected to the pedestal 1a. A cylindrical reactor shielding wall (RSW) 1 b disposed so as to surround the RPV is formed, and the pedestal 1 a and the reactor shielding wall 1 b are constructed as a concrete structure 1.

  The method for dismantling the concrete structure in the reactor containment vessel of the present embodiment is applied to dismantle the concrete structure 1 of the pedestal 1a and the reactor shielding wall 1b. First, as shown in FIG. The work floor 15 is grounded on the operation floor 5 provided on the upper side of A. At this time, in this embodiment, first, a disk-shaped work floor 15 having a diameter corresponding to the inner diameter of the reactor shielding wall 1b so that the diameter is slightly smaller than the inner diameter of the cylindrical reactor shielding wall 1b. (Work floor construction process).

  Next, as shown in FIG. 2, a work floor lifting equipment 16 for suspending and supporting the work floor 15 so as to be movable between the operation floor 5 and the inside of the concrete structure 1 is constructed (work floor suspension). Installation process). The work floor hoisting facility 16 of this embodiment includes a support column 16a formed by combining steel frames and a beam 16b formed by combining steel frames and installed on the support columns. The column 16a is erected on the operation floor 5 on both the left and right sides of the central axis O1 of the cylindrical concrete structure 1, and the beam 16b is supported on the column 16a by using the overhead traveling crane 3. To do. At this time, the beam 16b is supported by the pillars 16a erected on the left and right operation floors 5 so as to pass over the central axis O1 of the concrete structure 1 while adding the pillars 16c as temporary receiving vents. Is built. Further, at the stage where the beam 16b is thus installed, the support column 16c as a temporary receiving vent is dismantled and removed.

  Further, as shown in FIGS. 3 and 4, while using the overhead traveling crane 3, a hoist rail 17 is attached to the beam 16b, and a work floor hanging jack 18 is attached to the beam 16b so as to be movable along the beam 16b. Install and install jacking equipment. Further, in this embodiment, the work floor hanging jack 18 is attached to the beam 16b via the chill tank 19, and the chill tank 19 and the work floor hanging jack 18 are moved along the beam 16b by driving the chill hole 20. .

  Further, as shown in FIGS. 4 and 5, the work floor 15 is connected to the work floor hanging jack 18 installed in this way, and a hoist crane (for example, a 15 ton class hoist crane) 21 is attached to the hoist rail 17. Preparation for dismantling is completed.

  Next, as shown in FIGS. 5 and 6, the chill tank 19 and the work floor hanging jack 18 are moved in the chill hole 20, and the work floor 15 is disposed immediately above the concrete structure 1. Further, the work floor hanging jack 18 is driven to lower the work floor 15 and insert it into a predetermined position inside the reactor shielding wall 1b of the concrete structure 1 (work floor installation step). Further, for example, a dismantling robot (dismantling device) 22 that can be remotely operated while being suspended by the overhead traveling crane 3 is disposed on the work floor 15 (dismantling device installation step). Note that the dismantling robot 22 may be disposed on the work floor 15 in advance, and the work floor 15 may be lowered and disposed at a predetermined position inside the concrete structure 1 with the dismantling robot 22 mounted thereon.

  The dismantling robot 22 on the work floor 15 is remotely operated to dismantle the upper end side of the reactor shielding wall 1b of the concrete structure 1. Further, the positions of the work floor 15 and the dismantling robot 22 are sequentially lowered by the work floor hanging jack 18, and the dismantling robot 22 is remotely operated to dismantle the nuclear reactor shielding wall 1b from the upper end side to the lower end portion sequentially. At this time, the dismantling material is accommodated in the dismantling material container 23, the dismantling material container 23 is transported to the operation floor 5 by the hoist crane 21, and the dismantling material is sequentially discharged and removed to the outside (concrete structure dismantling process).

  Further, as shown in FIGS. 7, 8, 9, and 10, the pedestal 1 a is continuously disassembled in the same manner when the disassembly of the reactor shielding wall 1 b is completed. At this time, since the inner diameters of the reactor shielding wall 1b and the pedestal 1a, and the pedestal 1a itself vary depending on the position, the work floor hanging jack 18 and the chill hole 20 are appropriately driven according to the inner diameter, and the work floor 15 Is returned to the operation floor 5 and replaced with a work floor 15 having a size suitable for the inner diameter of the pedestal 1a (concrete structure 1). At this time, the work can be easily replaced by jointing the work floor 15 with bolts.

  Then, the work floor 15 according to the size of the inner diameter of the pedestal 1a is suspended at a predetermined position inside the pedestal 1a, and the dismantling robot 22 disposed on the work floor 15 is remotely operated to move the pedestal 1a to the upper end. We dismantle sequentially from the side (concrete structure dismantling process).

  As shown in FIGS. 11 and 12, after dismantling the concrete structure 1, the hoist crane 21 is removed, the chill hole 20 and the chill tank 19, the work floor hanging jack 18, and the hoist rail 17 are removed in reverse to the preparation for dismantling. Moreover, the support column 16c as a temporary receiving vent is provided, and the beam 16b and the support columns 16a and 16c are removed, and the dismantling and removal work of the concrete structure 1 in the reactor containment vessel A is completed.

  Therefore, in the method of dismantling the concrete structure 1 in the reactor containment vessel of the present embodiment, the post 2 is set up inside the cylindrical concrete structure 1 of the pedestal 1a and the reactor shielding wall 1b as in the prior art. No disassembly work can be performed remotely from the operation floor 5. Thereby, even if the inside of the reactor containment vessel A is contaminated to a high level by FP or the like, the concrete structure 1 can be surely dismantled only by accessing the operation floor 5. .

  Moreover, in the method for dismantling the concrete structure 1 in the reactor containment vessel of the present embodiment, the concrete structure 1 is dismantled by remotely operating the dismantling device 22 (dismantling robot) disposed on the work floor 15. Therefore, it is possible to dispose the dismantling device close to the concrete structure 1 simply by placing it on the work floor 15, and it is possible to perform dismantling work using a wide variety of dismantling devices.

  As mentioned above, although 1st Embodiment of the dismantling method of the concrete structure in a reactor containment vessel concerning this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it is appropriate. It can be changed.

  Next, a method for dismantling the concrete structure in the reactor containment vessel according to the second embodiment of the present invention will be described with reference to FIGS. As in the first embodiment, the present embodiment is a method and apparatus that makes it possible to reliably dismantle and remove the concrete structure of the pedestal and the reactor shielding wall even when contamination occurs at a high level. It is about. Therefore, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  First, as shown in FIG. 13, the dismantling apparatus 30 of the present embodiment is connected to a main unit 31 and a wire 32 of an overhead traveling crane 3, and is a remote hanging device (detachable integrally provided on the main unit 31). And a hanger 33).

  As shown in FIG. 13 to FIG. 15, the remote hanger 33 is for holding the main unit 31 in a detachable manner and suspending the main unit 31 from the overhead traveling crane 3. The wire connection part 33a which connects the wire 32 of the overhead traveling crane 3 at equal intervals in the circumferential direction is provided on the outer peripheral edge side. In addition, a plurality of unit connection portions 33b provided with connection holes protruding downward and penetrating from one side surface to the other side surface are provided on the outer peripheral edge side on the lower surface side. Further, a connection mechanism 33d provided with a connection pin 33c that is disposed on the inner side of each unit connection portion 33b and can be moved back and forth is provided.

  On the other hand, as shown in FIG. 13, the main unit 31 is formed in a substantially disk shape, and the connection board part 34 for connecting to the remote hanging tool 33 and the axis of each other coaxially on the lower surface of the connection board part 34. And a dismantling mechanism portion 36 that is connected to the expansion / contraction mechanism portion 35 so as to be movable back and forth in the vertical direction.

  The connection board part 34 is formed in a substantially disk shape, and is provided with a plurality of hanging tool connection parts 34 a provided with connection holes protruding upward and penetrating from one side surface to the other side surface on the outer peripheral edge side on the upper surface side. . And this connection board part 34 is arrange | positioned so that the connection holes of the remote hanger 33, the unit connection part 33b, and the hanger connection part 34a of each other may communicate, and it advances the connection pin 33c of the connection mechanism 33d with this. By connecting the remote hanging tool 22 to each other through the connection holes. In addition, one end of the expansion / contraction mechanism 35 is connected to the outer peripheral edge of the lower surface of the connection board 34 and at equal intervals in the circumferential direction.

  The dismantling mechanism part 36 is connected to the other end of the expansion / contraction mechanism part 35 and is supported by a substantially ring board-like support board 37 that moves forward and backward in the vertical direction with respect to the connection board part 34, and the dismantling apparatus 30 and the concrete structure 1 detachably. And a cutting mechanism 39 for cutting the concrete structure 1 from the inner surface side in the circumferential direction to separate the upper end side of the concrete structure 1 by remote control. ing.

  The holding mechanism 38 is integrally provided on the outer peripheral edge side of the lower surface of the support board 37 at equal intervals in the circumferential direction, and suspends the dismantling device 30 with the wire 32 and engages with the upper end side of the concrete structure 1. And it is comprised so that the demolition apparatus 30 and the upper end part side of the concrete structure 1 may be hold | maintained integrally so that attachment or detachment is possible. When the concrete structure 1 is held by the holding mechanism 38, the axes of the support board 37 and the connecting board 34 are automatically arranged substantially coaxially with the central axis O1 of the concrete structure 1, and in this state, the support board 37 and the connection board part 34 are comprised so that it may install in the upper end part of the concrete structure 1 integrally.

  On the other hand, the cutting mechanism 39 includes a turning support portion 39a, a feed portion 39b, and a disc cutter 39c that is a cutting means. The turning support part 39a is formed in a substantially cylindrical shape and is provided with a flange that protrudes radially outward at the upper end and is connected in an annular shape. The turning support portion 39 a is inserted into the inner hole of the support plate 37 from above, and is supported by locking the flange on the upper surface of the support plate 37. Further, at this time, the flange is engaged with an annular track provided on the upper surface of the support plate 37, and the turning drive means (not shown) is driven by remote operation, so that the turning support portion 39a and the cutting mechanism 39 are rotated around the axis. It is comprised so that turning is possible.

  The feed portion 39b is attached to the lower end side of the turning support portion 39a, and is configured to drive a feed drive means (not shown) by remote operation and to advance and retreat in the radial direction.

  Further, the disk cutter 39c is attached to the tip of a rotating shaft extending in the vertical direction of the rotation driving means attached to the feeding portion 39b. In addition, a coolant supply mechanism (not shown) is provided so that coolant can be supplied to the rotating disk cutter 39c.

  Further, the disk cutter 39c of the cutting mechanism 39 is inserted and disposed inside the concrete structure 1 with the holding mechanism 38 integrally holding the dismantling device 30 and the upper end side of the concrete structure 1. And remote operation of a turning drive means, a feed drive means, a rotation drive means, etc. is performed by operating the operation panel 40 provided in the operation floor 5, for example.

  When dismantling and removing the concrete structure 1 of the pedestal 1a and the reactor shielding wall 1b using the dismantling apparatus 30 of the present embodiment having the above-described configuration, the remote suspension 33 and the main unit 31 are connected on the operation floor 5. Then, the dismantling device 30 is transported directly above the concrete structure 1 by the overhead traveling crane 3.

  Next, as shown in FIGS. 13 and 14, the wire 32 is fed from the overhead traveling crane 3 to suspend the dismantling device 30, and the holding mechanism 38 is engaged with the upper end portion of the reactor shielding wall 1b. The mechanism 38 holds the dismantling device 30 at the upper end of the reactor shielding wall 1b. In this way, when the demolition device 30 is installed at the upper end of the concrete structure 1, the central axis O1 of the concrete structure 1 and the axis line of the demolition device 30 are arranged substantially coaxially, and the disk cutter 39c is connected to the nuclear reactor. It is inserted and arranged at a predetermined position inside the shielding wall 1b. That is, the demolition apparatus 30 is installed at a predetermined position on the upper end side of the concrete structure 1 (demolition apparatus installation process).

  Then, the turning drive means, the feed drive means, the rotation drive means, and the like are appropriately remotely operated on the operation panel 20, and the disk cutter 39c cuts and separates the upper end portion side of the reactor shielding wall 1b (concrete structure cutting and separating step). At this time, an isolation house 6 for isolating the space where the concrete structure 1 exists is provided, and dust and the like are prevented from being scattered outside.

  When the upper end portion side of the reactor shielding wall 1b is cut and separated by the disc cutter 39c, the block-shaped cut piece is held by the disassembly device 30 by the holding mechanism 38. For this reason, the overhead traveling crane 3 is operated to lift the cut piece together with the dismantling device 30 and transport it to the secondary cutting yard 7 provided in the isolation house 6 on the operation floor 5 (cut piece collecting step).

  The secondary cutting processing yard 7 is provided with secondary cutting means 10 such as a turntable 8, a water collecting pan 9, and a wire saw. Then, the cut piece is placed on the turntable 8, the cut piece is shredded by the secondary cutting means 10, the shredded cut piece is stored in a storage container and carried out to the outside. The waste liquid generated by using water at the time of secondary cutting is sent from the water collecting pan 8 to the waste liquid recovery tank 11 and further sent to the waste liquid processing apparatus 12 for processing.

  Then, the dismantling device 30 is lowered again to the concrete structure 1 with the overhead traveling crane 3 and held on the upper end portion of the reactor shielding wall 1b by the holding mechanism 38, and at the upper end side of the reactor shielding wall 1b by the disk cutter 39c. Are cut and separated, and the cut pieces are conveyed to the secondary cutting yard 7. By repeating such an operation, as shown in FIGS. 14 and 15, the concrete structure 1 is disassembled sequentially from the upper side to the lower side from the reactor shielding wall 1b to the pedestal 1a.

  Therefore, also in the method for dismantling the concrete structure in the reactor containment vessel and the demolishing apparatus 30 for the concrete structure in the reactor containment vessel of the present embodiment, as in the first embodiment, the pedestal 1a and the reactor shielding are conventionally performed. There is no need to enter the inside of the cylindrical concrete structure 1 on the wall 1b and erect the post 2, and the dismantling work can be performed remotely from the operation floor 5. Thereby, even if the inside of the reactor containment vessel is contaminated at a high level by FP or the like, the concrete structure 1 can be surely dismantled and removed only by accessing the operation floor 5.

  As described above, the second embodiment of the method for dismantling the concrete structure in the reactor containment vessel according to the present invention has been described. However, the present invention is not limited to the above-described embodiment, and may be appropriately selected without departing from the scope of the present invention. It can be changed.

  For example, as shown in FIG. 16, the dismantling apparatus 30 locks the connection board portion 34 of the main body unit 31 to the building housing and advances and retracts the dismantling mechanism portion 36 by the expansion and contraction mechanism portion 35. The holding mechanism 38 may be engaged with the upper end portion and installed.

  Further, in the present embodiment, the dismantling apparatus 30 has been described as including the disk cutter 39c as the cutting means of the cutting mechanism 39.

On the other hand, for example, as shown in FIG. 17, the cutting mechanism 39 is attached to the turning support part 39a supported to be turnable on the support plate 37 and to the lower end side of the turning support part 39a so as to be able to advance and retreat in the radial direction. The feed unit 39b and the feed unit 39b may be configured to include a high-pressure water jet head 39d that is supported by the feed unit 39b so as to be movable back and forth in the vertical direction and jets high-pressure water radially outward. That is, a high-pressure water jet head 39d may be provided as a cutting means.
Also, an ultra high pressure water generation facility 41, a water tank 42, an abrasive supply device 43 for supplying an abrasive to the high pressure water to be ejected, and the like are installed on the operation floor 5, for example. Furthermore, the high-pressure water ejection head 39d is configured to be able to swing left and right, vertically and horizontally.
In the dismantling device 30, the turning driving means, the feeding driving means, the ejection head up-and-down driving means (not shown) are remotely operated by, for example, the operation panel 40 placed on the operation floor 5, and high-pressure water (water jet). Thus, the concrete structure 1 can be cut and separated. Therefore, even if it is a case where the dismantling apparatus 30 is comprised in this way, the effect similar to this embodiment can be acquired.

Further, for example, as shown in FIG. 18, the cutting mechanism 39 includes a turning support portion 39a that is turnably supported by the support plate 37, and a feed portion that is attached to the lower end side of the turning support portion 39a so as to be movable back and forth in the radial direction. 39b and a laser head 39e that is supported by the feed portion 39b so as to be movable back and forth in the vertical direction and that irradiates a laser beam radially outward. That is, you may comprise the laser head 39e as a cutting | disconnection means.
Further, an assist gas supply facility 44, a laser head cooling facility 45, a fume recovery facility 46, and the like are installed on the operation floor 5, for example. Further, the laser head 39e is configured to be able to swing left and right, vertically and horizontally.
In this dismantling apparatus 30 as well, a turning drive means, a feed drive means, a laser head up-and-down drive means (not shown), etc. are remotely operated, for example, with an operation panel 40 placed on the operation floor 5, and a concrete structure is irradiated by laser irradiation. 1 can be cut and separated. Therefore, even if it is a case where the dismantling apparatus 30 is comprised in this way, the effect similar to this embodiment can be acquired.

Furthermore, as shown in FIG. 19, for example, the cutting mechanism 39 is provided with a turning support portion 39a that is turnably supported by the support plate 37, and a feed portion that is attached to the lower end side of the turning support portion 39a so as to be able to advance and retreat in the radial direction. You may make it comprise 39b and the core drill 39f supported by a feed part with a rotating shaft facing a radial direction and a core bit facing a radial direction outer side.
In this dismantling apparatus 30 as well, the turning drive means, the feed drive means, the core drill drive means, etc. (not shown) are remotely operated by the operation panel 40 placed on the operation floor 5, for example, and the core drill 39f is applied to the concrete structure 1. The concrete structure 1 can be cut and separated by opening holes and continuously forming holes as needed. Therefore, even when the dismantling apparatus 30 is configured in this way, the same operational effects as those of the present embodiment can be obtained.

Furthermore, as shown in FIG. 20, for example, the cutting mechanism 39 is supported and arranged by an endless wire saw 39g and a support board 37, and the endless wire saw 39g is wound around the cutting mechanism 39 in one direction. A plurality of support rollers 39h that are rotatably supported, and a support member 39i for horizontally arranging a part of the wire saw 39h supported by the support rollers 39h so as to surround the concrete structure 1 from the outside. You may make it comprise and comprise.
One support roller 39h is rotationally driven around the axis by the drive of the rotational drive means, and rotates the wire saw 39g in one direction. Further, a part of the support roller 39h is a movable movable roller, and the position (tension) of the wire saw 39g in the portion surrounding the concrete structure 1 can be adjusted by moving the movable roller. .
In the dismantling apparatus 30 as well, the wire saw 39g is rotated and moved in one direction by remotely operating a rotation driving means (not shown) with the operation panel 40 placed on the operation floor 5, for example. The concrete structure 1 can be cut and separated by 39 g. Therefore, even when the dismantling apparatus 30 is configured in this way, the same operational effects as those of the present embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Concrete structure 1a Pedestal 1b Reactor shielding wall 2 Post 3 Overhead traveling crane 4 Conventional dismantling apparatus 4a Cutting mechanism 4b Cutting piece holding mechanism 5 Operation floor 6 Isolation house 7 Secondary cutting yard 8 Turntable 9 Water collecting pan 10 2 Next cutting means 11 Waste liquid recovery tank 12 Waste liquid treatment device 15 Work floor 16 Work floor suspension equipment 16a Post 16b Beam 16c Post 17 as temporary receiving vent Hoist rail 18 Work floor suspension jack 19 Chill tank 20 Chill hall 21 Hoist crane 22 Demolition robot (Dismantling device)
23 Demolition material container 30 Demolition device 31 Main unit 32 Wire 33 Remote hanging tool (hanging tool)
33a Wire connection part 33b Unit connection part 33c Connection pin 33d Connection mechanism 34 Connection board part 34a Hanging tool connection part 35 Telescopic mechanism part 36 Disassembly mechanism part 37 Support board 38 Holding mechanism 39 Cutting mechanism 39a Turning support part 39b Feeding part 39c Disk cutter (Cutting means)
39d High pressure water ejection head (cutting means)
39e Laser head (cutting means)
39f Core drill (cutting means)
39g Wire saw (cutting means)
39h Supporting roller 39i Support member 40 Operation panel 41 Ultra-high pressure water generation facility 42 Water tank 43 Abrasive supply device 44 Assist gas supply facility 45 Laser head cooling facility 46 Fume recovery facility A Reactor containment vessel O1 Central axis of concrete structure

Claims (6)

A method of dismantling and removing a cylindrical concrete structure in a reactor containment vessel,
On the operation floor provided on the upper side of the reactor containment vessel, a work floor construction step of constructing a work floor having a diameter smaller than the inner diameter of the concrete structure;
A work floor lifting equipment installation step for constructing a work floor lifting equipment for hanging and supporting the work floor movably between the operation floor and the inside of the concrete structure;
A work floor installation step of arranging the work floor at a predetermined position inside the concrete structure;
Dismantling device installation step of disposing the dismantling device on the work floor;
A concrete structure in a reactor containment vessel, comprising: a concrete structure demolition step in which the work floor is sequentially lowered and the concrete structure is dismantled from the upper end side by the remotely operated demolition apparatus. How to dismantle things. A method of dismantling and removing a cylindrical concrete structure in a reactor containment vessel,
A dismantling device that engages with an upper end portion side of the concrete structure and detachably holds the dismantling device and the upper end portion side of the concrete structure integrally; and the dismantling device and the The upper end side of the concrete structure is inserted into the concrete structure in a state where the upper end side of the concrete structure is integrally held, and is cut in the circumferential direction from the inner surface side by remote operation. And a cutting mechanism for separating the
Dismantling device installation in which the dismantling device is suspended by a wire, the holding mechanism is engaged and held on the upper end side of the concrete structure, and the dismantling device is installed at a predetermined position on the upper end side of the concrete structure Process,
A concrete structure cutting and separating step of remotely operating the cutting mechanism to cut and separate the upper end side of the concrete structure;
A reactor containment vessel characterized by repeatedly performing a cut piece collecting step of lifting and collecting the cut pieces of the concrete structure together with the demolition device to dismantle the concrete structure sequentially from above to below. Dismantling method of inner concrete structure. An apparatus for dismantling and removing a cylindrical concrete structure in a reactor containment vessel,
A holding mechanism that integrally holds the dismantling device and the upper end side of the concrete structure so as to be detachable by hanging with a wire and engaging with the upper end side of the concrete structure;
With the holding mechanism integrally holding the dismantling device and the upper end side of the concrete structure, it is inserted into the concrete structure, and the concrete structure is cut from the inner surface side in the circumferential direction by remote operation. And a cutting mechanism for separating the upper end portion side of the concrete structure. In the dismantling apparatus for the concrete structure in the reactor containment vessel according to claim 3,
A dismantling apparatus for a concrete structure in a reactor containment vessel, wherein the cutting means provided in the cutting mechanism includes any of a disk cutter, a high-pressure water jet head, a laser head, a core drill, and a wire saw. In the dismantling apparatus for the concrete structure in the reactor containment vessel according to claim 3 or 4,
A reactor containment vessel comprising: a main body unit including the holding mechanism and the cutting mechanism; and a hanger that is connected to the wire and is detachably integrated with the main body unit. Dismantling equipment for internal concrete structures. In the dismantling apparatus for the concrete structure in the reactor containment vessel according to claim 5,
The main body unit is connected to the connection board part detachably connected to the hanging tool, the dismantling mechanism part including the holding mechanism and the cutting mechanism, and the connection board part and the dismantling mechanism part. An apparatus for disassembling a concrete structure in a reactor containment vessel, comprising: an expansion / contraction mechanism part that connects the disassembly mechanism part to the connection panel part so as to be movable forward and backward.

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