JPH0752237B2 - Recovery method of dismantled material in concrete structure and recovery apparatus thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for recovering dismantled concrete structures and a recovery apparatus therefor.

(Prior Art) Generally, a nuclear power plant depends on the service life of its facilities.
Those that have been used for 30 to 40 years will be decommissioned.

Various methods have been considered for disposal of this decommissioned nuclear power plant, but in Japan, the method of finally dismantling and removing and constructing a new reactor on the same site is considered. There is.

However, the inside of the cylindrical thick-walled concrete structure forming the reactor has been activated or contaminated at a high level by neutrons and radioactivity leaking from the reactor, so during this dismantling this part How to leave until the end,
Two methods are considered to be removed first.

Among these, as the latter method, the invention of Japanese Patent Publication No. 62-31144 is known.

This is because the inner wall of a cylindrical concrete structure that houses a nuclear reactor is cut or drilled vertically or horizontally with a cutter or core drill to form a block, and then the cutter or core drill is replaced with a dulter to form a groove or This is a method in which the base of a concrete block is inserted into a hole, cut and dropped, and the dropped concrete block is collected by another take-out device.

(Problems to be solved by the invention) However, in the recovery method as described above, the cutting work and the recovery work are separated because the cut concrete mass is once dropped and then recovered by another take-out device, so that the work efficiency is improved. There was a problem of being bad.

The present invention has been made to solve such a problem, and an object thereof is a recovery method and a recovery apparatus for continuously performing a cutting operation and a recovery operation of a part of a concrete structure with a single device. Is to provide.

(Means for Achieving the Object) A method for recovering a dismantled concrete structure according to the present invention for achieving the above-mentioned object is to provide a predetermined location in the thickness direction of a wall of a concrete structure that houses a nuclear reactor. , A core drill is drilled in a certain direction to cut the inner part of the wall body from the outer part of the wall body, and the inner part of the cut wall body is shredded to a predetermined size to dismantle the concrete structure. In this case, a recovery device in which the lifting device for the core appears and disappears from the openable and closable opening provided from the side surface to a part of the bottom surface is formed on the upper surface of the core generated when the core drill is drilled with the opening portion left open. Installed, projecting the lifting device for the core from the opening, inserting the expandable and contractible cylindrical body provided in the lower part into the hole on the upper surface of the core, and then expanding the cylindrical body and fixing it in the hole Lifting equipment The configuration is characterized in that the core is broken from the root by swinging the device in the lateral direction, the broken core is drawn into the collecting device from the opening and stored, and the opening is closed and collected. In addition, in the device for recovering dismantled material in a concrete structure, a rotary shaft is erected in a hollow recovery cylinder provided with an opening that opens and closes from a side surface to a part of the bottom surface. A support device that moves up and down by the rotation is provided,
The support device is provided with a core lifting device that projects downward from the opening to lift the core, and a swinging device that laterally moves the core lifting device. A structure comprising a cylindrical body which is inserted into a hole in an upper surface and holds a core and which is divided into a plurality of pieces in a vertical direction, and a lock rod which is inserted into the cylindrical body and moves up and down to expand and contract the cylindrical body. Is to

(Operation) According to the above-mentioned recovery method, the core generated during drilling with the core drill is broken, the core is pulled into the recovery device and stored, and then the recovery device is lifted and recovered to break the core. Since work and recovery can be performed continuously, work efficiency can be improved.

Further, according to the recovery device, the core is folded by the lifting device for the core, the folded core is stored in the collection cylinder through the opening, and then the opening is closed to close the core. It can be collected by the body.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

The recovery device of the present invention comprises a hollow recovery cylinder A having notches 1a and 2a, a core lifting device 12 for lifting a core 14,
It comprises a swinging device 3 for moving the core lifting device 12 laterally.

The collecting cylinder A has three circular upper and lower circular tables 1 and 2 partially provided with notches 1a and 2a, and an upper plate 6 having the same diameter and arranged at appropriate intervals with the tables 1 and 2. It is fixed by a fixed shaft 5 of a book, and a space between the tables 1 and 2 and the upper plate 6 is covered with an outer shell shell 18 having a cutout portion 18a.

A cutout portion 18a of an outer shell 18 is provided at a position where the cutout portions 1a and 2a of the tables 1 and 2 are located, and the cutout portion 18a can be freely opened and closed by an arc-shaped inner shell shell 19 provided inside the left and right sides. Has become.

The movement of the inner shell 19 is enabled by the opening / closing motor 20 meshing with the rack inside the inner shell 19 via the worm gears 21 and 22 provided on the upper table 1.

Further, the notches 1a and 2a of the tables 1 and 2 are also the lower table 2
The lower table 2 can be rotated by rotating the lower table 2 by rotating the lower table 2 through a pinion 13 with a gear 15 engraved on the outer periphery of the lower table 2. Has become.

Therefore, the notches 1a and 2a of the tables 1 and 2 and the notch 18a of the outer shell 18 form an opening 3a in the recovery cylinder A that can be opened and closed.

A rotary shaft 4 provided with a screw is erected at the center of the tables 1 and 2, and this is a drive motor 7 at the center of the upper plate 6.
It can be rotated with. Further, one fixed leg 16 and two movable legs 17 are arranged on the outer periphery of the lower table 2 in a well-balanced manner, and the recovery cylinder A is installed vertically by finely adjusting the movable legs 17 up and down. It has become.

The rotating shaft 4 is provided with a supporting device 8 which moves up and down by its rotation, and the supporting device 8 is provided with a horizontal rail 9 at a position located in the opening 3a.

This rail 9 is the window 2 of the frame 12b of the lifting device 12 for cores.
The core hoisting device 12 is suspended by penetrating into the shaft 3, and the motor 26 in the frame 12b is engaged with the rack 24 of the rail 9 via various rotation mechanisms 27 so that it can be moved laterally. .

A lifting shaft 10 for lifting the core 14 and a swinging device 3 for moving the core lifting device 12 in the lateral direction are provided below the core lifting device 12.

In this lifting shaft 10, a lock rod 35 having a rhomboidal cross-section at its tip is vertically movably attached to the chambers 32, 33, 34 in the upper, middle, lower three stages from the lower chamber 34 to the upper chamber 32. 32
A bias spring (44) for raising the lock rod (35) is wound between the upper end flange portion (36) and the bottom plate of the upper chamber (32). Further, the lock rod 35 in the lower chamber 34 is also provided with a flange portion 36, and between the flange portion 36 and the bottom plate 32a of the upper chamber 32, contraction is caused by the cooling air from the pipes 45, 46 and heating of the heating coil 43 is performed. A stretchable shape memory alloy spring 42 is wound.

Therefore, the spring 42 in the middle chamber 33 is always in the extended state, and when the collar portion 36 abuts the bottom plate 37, the lock rod 35
Is the most prominent state.

Further, a cylindrical body 39 in which a lock rod 35 is inserted is attached to the lower chamber 34, the cylindrical body 39 is vertically divided into three, and a flange portion 38 of the lower chamber 34 is pressed from the left and right by springs 41. Always trying to push the lock rod 35 downward. Therefore, when the spring 42 is contracted by the cooling air supplied into the middle chamber 33 and the lock rod 35 is raised by the bias spring 44, the entire tapered cylindrical body 39 is pushed outward by the taper surface 40 at the tip.

Further, the holes through which the lock rods 35 pass through in the bottom plates 32a and 37 of the upper chamber 32 and the middle chamber 33 are filled with a sealing material 47 so that they are hermetically shielded from each other.

The rocking device 3 is for moving the core lifting device 12 laterally in a state where the cylindrical body 39 is inserted into the hole of the core 14 and breaking off the root of the core 14, and the frame body of the core lifting device 12 A reaction force arm 11 is provided on the lower part of 12b, and the reaction force arm 11 is rotated by a motor 28 to a gear via a reduction mechanism 29.
It is designed to project by turning 30.

Next, a recovery method using this recovery device will be described.

FIG. 10 shows a case where the inner portion 49a of the wall 49 of the concrete structure 48 for housing the nuclear reactor is dismantled to a predetermined depth, that is, the uncontaminated inner upper wall 49c is dismantled.

When the contaminated wall body of the concrete structure 48 is to be dismantled, a predetermined portion is drilled in a certain direction by a core drill to cut the inner portion 49a of the wall body from the outer portion 49b of the wall body. When drilling with this core drill, make a hole in the center of the upper surface.
A core 14 with 14a is formed.

Next, the recovery device is suspended above the core 14 so that the notches 1a and 2a of the tables 1 and 2 are positioned, and the movable leg 17 is finely adjusted to vertically install the entire recovery device.

Next, rotate the lower table 2 and the inner shell 19 to open the opening.
3a is opened and the rotary shaft 4 is rotated to lower the core lifting device 12.

Then, the core hoisting device 12 is slightly moved laterally along the rail 9 to insert the lock rod 35 into the hole 14a on the upper surface of the core 14 and supply cooling air to the middle chamber 33.

Since the bias spring 44 is contracted by this cooling air, the lock rod 35 is lifted by the spring 42 and pushes the cylindrical body 39 to spread it out, so that the core sticks closely to the hole 14a of the core 14 and is fixed.

Next, when the reaction force arm 11 is projected and the outer wall surface 49b is pushed, the core lifting device 12 swings in the lateral direction.
There is a crack at the root of this and it is broken off. In this case, the broken core 14 is in a state of being suspended by the suspension shaft 10.

Then, the core lifting device 12 is lifted while the core 14 is suspended by the rotation of the rotary shaft 4 and is drawn into the recovery cylinder A through the opening 3a.

Then, the inner shell 19 is moved in a state where the core 14 is pulled into the recovery cylinder A to close and seal the opening 3a, and then the recovery device is lifted and recovered. Further, all such recovery is performed by remote automatic operation.

(Effects of the Invention) The present invention having the above-described configuration has the following effects.

A recovery device in which the lifting device for the core appears and disappears from the openable and closable opening provided from the side surface to a part of the bottom surface is installed on the upper surface of the core generated when the core drill is drilled with the opening portion left open, After the core lifting device is projected from the opening and the expandable / contractible cylindrical body provided in the lower part thereof is inserted into the hole on the upper surface of the core, the core lifting device is expanded in a state of being fixed in the hole. The core is broken by swinging in the lateral direction, the broken core is pulled into the collecting device from the opening for storage, and the opening is closed to collect the core. It is possible to improve work efficiency because it can be continuously performed.

The core can be collected by the collection device in which the core is closed by breaking the core with the lifting device for the core, storing the broken core in the collection cylinder from the opening, and then closing the opening.

[Brief description of drawings]

FIG. 1 is a perspective view of the recovery device without the inner and outer shells, FIG. 2 is a perspective view of the recovery device, and FIGS. 3, 4, and 5 are plan views of the recovery device showing the operating state of the inner shell. FIG. 6 is a cross-sectional view of a lifting device for cores, FIG. 7 is a plan view of the same, FIG. 8 is a front view of the same, FIG. 9 is a cross-sectional view of a gripping tool, and FIG. 10 is concrete in which the core is broken off. It is sectional drawing of a structure. A: Recovery cylinder 1: Upper table 2: Lower table 3: Swing device 3a: Opening part 4: Rotating shaft 5: Fixed shaft 6: Upper plate 8: Support device 9: Rail 10: Lifting shaft 11: For reaction force Arm 12: Lifting device for core 13: Pinion 14: Core 15: Gear 16: Fixed leg 17: Movable leg 18: Outer shell 19: Inner shell

 ─────────────────────────────────────────────────── --- Continuation of front page (72) Inventor Naoki Hirono 3-16-43 Kitakarasuyama, Setagaya-ku, Tokyo (72) Inventor Hideaki Naganuma 806 Oyama, Matsudo-shi, Chiba (56) Reference JP-A-61-44400 ( JP, A)

Claims (2)

[Claims] 1. A core structure for accommodating a nuclear reactor at a predetermined position in the thickness direction of a wall body is drilled in a certain direction by a core drill to cut an inner portion of the wall body from an outer portion of the wall body. In the case of dismantling a concrete structure by shredding the inner part of the wall body that has been cut into a predetermined size,
A recovery device in which the lifting device for the core appears and disappears from the openable and closable opening provided from the side surface to a part of the bottom surface is installed on the upper surface of the core generated when the core drill is drilled with the opening portion left open, After the core lifting device is projected from the opening and the expandable / contractible cylindrical body provided in the lower part thereof is inserted into the hole on the upper surface of the core, the core lifting device is expanded in a state of being fixed in the hole. A concrete structure characterized by breaking the core from the root by swinging in the lateral direction, pulling the broken core into the collecting device through the opening and storing the core, and closing the opening to collect the core. Method of collecting dismantled materials in. 2. A rotating shaft is erected in a hollow collecting cylinder having an opening that opens and closes from a side surface to a part of a bottom surface,
This rotation shaft is provided with a support device that moves up and down by its rotation, and the support device has a core lifting device that projects downward from the opening to lift the core, and a swinging device that moves the core lifting device laterally. And a lifting device for the core, wherein the lifting device for the core is a cylindrical body that is inserted into a hole on the upper surface of the core and is vertically divided into a plurality of parts to hold the core; A device for recovering dismantled material in a concrete structure, comprising a lock rod for expanding and contracting the body.