JPH02311799A - Method and device for dismantlement of concrete structure of nuclear reactor - Google Patents

Abstract

PURPOSE:To improve a workability and a work speed by letting fall the cut-out concrete segments into a bucket hanging into a cavity, by descending the bucket to a bottom part of the cavity and by opening a center part of the bucket to transfer the segments to a carrier cart. CONSTITUTION:A back side of a concrete structure 1 is cut out to a predetermined thickness by a cutting nozzle 17 and the cut-out parts are vertically cut again at an even circumferential cutting distance. A taking-out bucket 40 with its circumferential side 42 being opened, is pressed to a side wall of a cavity 2 and is fixed at a predetermined position. The vertically cut-out parts are also cut into cut-out segments by swivelling the nozzle 17. In case that a bucket hanging wire 37 interferes with an abrasive jet, the interferance is avoided by driving a swivel motor to swivel a bucket driving device 30. When a certain amount of the segments is stored in the bucket 40, the circumferential side 42 is closed and descended to a bottom part 1b of the cavity to load the segments to a carrier cart 54 with its center part 43 being opened. Then, the carrier cart 54 is moved to outside the structure 1 and the segments are transferred to a container vessel. A slurry collected into a water collection pan 60 is introduced to an abrasives separator to recollect the abrasive material and then is solidified and disposed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for dismantling and dismantling a concrete structure in a nuclear reactor, in which high-pressure water mixed with an abrasive material is injected from a nozzle to cut and dismantle the concrete structure. and regarding its equipment.

[Conventional Methods] To dismantle the concrete structure housing the pressure vessel of a nuclear reactor, the work must be carried out by remote control because the concrete is radioactive.

It is also required to cut and dismantle the radioactive concrete without scattering it. A technique is known in which such a concrete structure is cut and dismantled by spraying high-pressure water mixed with an abrasive material from a nozzle, and the cut pieces are disposed of.

[Problems to be Solved by the Invention] The purpose of the present invention is to improve the workability and speed of cutting fragment processing, and to provide a method and apparatus for dismantling a concrete structure of a nuclear reactor that processes slurry. There is.

[Means for Solving the Problems] According to the present invention, high-pressure water mixed with an abrasive material is injected from a nozzle to cut and dismantle a concrete structure of a nuclear reactor, and the cut pieces are placed in a cavity of the structure. The periphery of the suspended bucket is opened and dropped onto the cavity wall, the periphery is closed and the bucket is lowered to the bottom of the cavity, the central part of the bucket is opened and the cut pieces are placed on a trolley. The cart is moved to the outside of the concrete structure to store the cut pieces in a storage container, and the slurry is collected in a water collection pan directly below the cavity, and the abrasive material is separated and recovered from the slurry and solidified. The abrasive material is disposed of, the slurry from which the abrasive material has been separated is agglomerated, neutralized and then settled to separate into sludge and water, the sludge is solidified and disposed of, and the water is led to a waste liquid treatment facility. A method for dismantling a concrete structure of a furnace is provided.

Further, according to the present invention, there is provided a cart that can freely rotate directly above the cavity of the concrete structure of the nuclear reactor, a turning device that turns the cart, and three wires that are provided on the cart at equal intervals around the circumference and from which wires are suspended. a sheave, a lifting device for lifting and lowering the wire, and a bucket suspended from the wire via a buffer mechanism, and the bucket has a regular hexagonal hopper-shaped body and a pivot at the upper opening edge of the body. a circumferential edge portion having an arcuate circumferential edge; a central portion having an equilateral triangular shape pivotally attached to the lower opening edge of the main body; A concrete demolition processing apparatus for a nuclear reactor is provided, which is characterized in that it is provided with a hydraulic cylinder equipped with a hydraulic cylinder.

The wire that hangs the bucket of the above device and the riggers that are arranged at equal intervals around the circumference that fix the nozzle part support drive device that supports and drives the nozzle to the cavity side wall are arranged so that they do not interfere with each other at the start of work. is preferable.

[Operation] In the device configured as described above, the cut pieces that have been cut and fallen are received in a carry-out bucket with an open peripheral edge, and when a predetermined number of pieces are reached, the circumferential edge is closed and the carry-out bucket is lowered to the bottom of the cavity, and the central part is Open it, load it onto a trolley, carry it outside and store it in a containment container.

The slurry that flows down and accumulates in the water collection pan is separated into abrasive material, sludge, and water. The abrasive material and sludge are solidified and disposed of, and the water is sent to the existing wastewater treatment equipment.

[Example] An apparatus for implementing the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire installation including the apparatus for carrying out the invention. The equipment generally includes a lifting device 3 installed directly above a cavity 2 of a concrete structure 1 to be demolished.
, a nozzle part support drive device 1o suspended from this lifting device 3, a carry-out bucket drive device 3o located at the lower part of the lift device 3, and a cut piece conveyance bucket 40 hung from the carry-out bucket drive device 3o. Directly below the cavity 2, a water collection pan 6o is provided. Then, the carry-out bucket drive device 3o and the carry-out bucket 4
0 constitutes a cut piece carrying-out device of the apparatus for carrying out the present invention, and a water collection pan 6o, the device shown in FIG. 9, cypress, etc. constitute a slurry recovery processing device.

In FIGS. 1 to 3, the lifting device 3 is a frame 4.
The frame 4 is provided with four running wheels 5, and the running motors 6.6 are mounted on one set of opposing wheels.
This allows the vehicle to run on rails 7.7 laid on the service floor 1a on the concrete structure 1. Further, the frame 4 is provided with a hoisting machine 8, and the nozzle part support drive device 1 is provided with three nozzle part suspension wires 9.
0 is suspended.

The nozzle part support drive device 10 has three parts on the top of the main body 11.
Book fixing devices 12 are provided at equal intervals around the circumference, and each of these fixing devices is provided with a telescoping rigger 13.
These riggers 13 are pressed against the side wall of the cavity 2 to fix the nozzle part support drive device 10 to the cavity 2. A rotating device (not shown) is provided inside the main body 11, and a nozzle lifting device 15 is provided at the bottom. A nozzle telescoping device 16 is provided at the bottom of the elevating device 15, a water jet nozzle 17 is provided at the tip of the telescoping device 16, and a splash protection cover 19 is provided on the nozzle 18. This nozzle 1
7. It is connected to a high-pressure pump (not shown) via a high-pressure hose 20, and is also connected to a supply hopper 23 provided on the work stage 4a of the frame 4 via an abrasive hose 22 and a secondary abrasive tank 21. Note that the shielding cover 29 denoted by the reference numeral 4a in the figure is a collection cable that collects the high-pressure hose 19, an electric cable, and a hydraulic hose.
゛On the other hand, on the service floor 1a is an abrasive supply device 24.
The abrasive material contained in the primary abrasive tank 25 is weighed by a weighing hopper 26 and fed into the supply hopper 23 by a mini conveyor 27.

In FIGS. 2 to 4, the unloading bucket drive device 3
0 is equipped with a truck 31 framed in a planar hexagonal shape, and the truck 31 is provided with six traveling wheels 32, and a swing motor 33 provided on one of the wheels is used to move the vehicle onto the service floor 1a concentrically with the cavity 2. Laid circular rail 7b
It is possible to rotate above. A sheave 35 perpendicular to the radius of the cavity 2 is erected at the center of the three frames 34 forming an equilateral triangle of the truck 31, respectively. Horizontal sheaves 36 and 36 are provided on both sides of one of the sheaves 35, and the other sheaves 35
．． On the sheave 36 side of 35, there is a similar sheave 36.3.
6 is provided.

One of the bucket hanging wires 37 guided by these sheaves 35 is extended into the cavity 2, and the other is provided on the trolley 31 directly and via the sheaves 36 to 36, and is a hoisting wire 37 driven by a hoisting motor 38. It is wound around a drum 39.

In FIGS. 5 and 6, the intermediate portion 41, which is the main body of the carry-out bucket 40, is formed in the shape of a regular hexagonal hopper, and three equally spaced corners of the upper opening edge are provided with cushion devices 46, respectively. It is suspended from a bucket hanging wire 37. A peripheral edge portion 42 having an arcuate circumferential edge is pivotally attached to each of the upper opening edges, and an equilateral triangular center portion 43 is pivotally attached to each of the lower opening edges. Hydraulic cylinders 44 are interposed on the outside between the main body 41 and the peripheral portion 42, and these hydraulic cylinders 44
The peripheral edge portion 42 is rotated from an open position shown by a solid line to a closed position shown by a two-dot chain line.

Similarly, hydraulic cylinders 45 are interposed on the outside between the main body 41 and the central portion 43, and these hydraulic cylinders 4
5 is adapted to rotate the central portion 43 from a closed position shown by a solid line to an open position shown by a two-dot chain line.

In FIGS. 7 and 8, the cushion device 46 is
An upper stopper bracket 47 having a downward U-shape, a lower stopper bracket 48 having an upward U-shape, and a rubber stopper 49 according to a known technique whose lower part is fixed to the upper stopper bracket 47 and whose upper part is fixed to the lower stopper bracket 48. It has become. The upper stopper bracket 47 is connected to the bucket hanging wire 37 by an upper hanging fitting 50.
The lower stopper bracket 48 is suspended from the connecting rod 51.
The connecting rod 51 is connected to a corner of the intermediate portion 41 of the carry-out bucket 4o by a connecting fitting 52, and is covered with a protective hose 53 that protects the connecting rod 51 from abrasive jets.

Note that each of the above-mentioned devices is connected to a control device (not shown),
Remote control is possible using a control panel (not shown) installed on the service floor la, an operation panel (not shown) installed in the measurement room, and a hand-held operation box (not shown) installed in the elevating device 3.

In FIG. 9, the slurry recovery processing device is a water collection pan 60.
(Fig. 1), an abrasive material separation device 61, a flocculation tank 62, a reaction tank 63, and a sedimentation tank 64 connected in series, and a treated water tank 65 and a sludge tank 66 connected in parallel to the sedimentation tank 64. It consists of

During disassembly, the lifting device 3 and the unloading bucket drive device 3
0 is positioned directly above the cavity 2, the nozzle part support drive device 10 is suspended from the lifting device 3, the rigger 13 is extended and fixed at a predetermined position in the cavity 2, and the peripheral edge portion 42 is placed directly above the carry-out bucket drive device 30. A closed cut piece carrying-out bucket 40 is suspended and lowered to the cavity bottom 1b. On this occasion,
It is preferable that the rigger 13 and the bucket hanging wire 37 are arranged so as not to interfere with each other.

First, an upwardly facing back surface cutting nozzle 17 is attached to the nozzle support, an abrasive jet is injected, and the concrete is rotated by about 60 degrees using a turning device to cut the back surface of the concrete to a predetermined thickness. Next, the nozzle 17 is replaced with a straight horizontal and vertical cutting nozzle 17, and moved up and down by the lifting device 15 to vertically cut the cut portion of the back surface into, for example, three sections equally distributed around the circumference.

Next, the carrying-out bucket 40 is raised, the peripheral edge 42 is opened, and the bucket 40 is fixed in a predetermined position below the nozzle support drive device 10 by pressing against the side wall of the cavity 2 . Then, the nozzle 17 is turned by a turning device, and the upper edge of the vertically cut portion is cut horizontally into three cut pieces.

The cut pieces fall into the bucket 40 below, but the impact at that time is absorbed and alleviated by the cushion device 46.

The above process is repeated in the circumferential direction, but if the bucket hanging wire 37 interferes with the abrasive jet,
The rotation motor 33 is driven to rotate the carry-out bucket drive device 30 to avoid interference.

At this time, since the wire 37 and the rigger 13 are arranged so as not to interfere with each other as described above, the above-mentioned turning is slight and does not interfere with the work at all.

When a predetermined number of cut pieces have accumulated in the carry-out bucket 40, the peripheral portion 42 is closed and lowered to the cavity bottom 1b, and the central portion 4
3 is opened and the cut pieces are loaded onto the cart 54. And trolley 5
4 is moved to the outside of the concrete structure 1, and the cut pieces are gripped by a gripping device (not shown) and stored in a storage container (not shown).

On the other hand, the slurry that flows down and accumulates in the water collection pan 60 is guided to an abrasive material separation device 61 to recover abrasive materials, and the recovered abrasive materials are transferred to a treatment plant 68 where they are solidified and disposed of. Then, a pH adjusting chemical is added to neutralize the slurry, and the abrasive material is recovered.A flocculant is added to the slurry in a coagulation tank 62, a coagulation aid is added in a reaction tank 63, and the slurry is transferred to a sedimentation tank 64 and allowed to settle. The sludge settled in the sedimentation tank 64 is transferred to a sludge tank 66 and then solidified and disposed of in a treatment plant 68, and the supernatant water is led to a treated water tank 65 and then flows into the existing wastewater treatment equipment.

[Effects of the Invention] Since the present invention is configured as described above, it provides the following effects.

That is, in the process of cutting and dismantling a concrete structure and transporting the cut pieces with a carry-out bucket, the carry-out bucket is spread over the entire surface of the cavity to receive the cut pieces, and the carry-out bucket is slightly rotated so that the bucket hanging wire 37 is rigged. 13 can be avoided, and work efficiency and work speed can be improved. - In addition, the cushion device 46 absorbs and alleviates the impact when the cut pieces fall into the carry-out bucket, thereby preventing damage to the carry-out bucket, hanging wire, and hoisting drum.

In addition, the slurry is collected in a water collection pan and separated into abrasive material, sludge, and water using a recovery treatment device.The abrasive material and sludge are solidified and disposed of, and the water is drained to the existing wastewater treatment device for efficient treatment. I can do it.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing the equipment including the device for implementing the present invention, FIG. 2 is a plan view showing the transport bucket drive device of the device for implementing the present invention, and FIG. 3 is A-A in FIG. 2. 4 is a sectional view taken along line B-B in FIG. 2, FIGS. 5 and 5 are plan views showing the carrying out bucket, and FIG. 6 is A-A in FIG.
A sectional view taken along the line; FIG. 7 is a side view showing the cushion device;
FIG. 8 is a side view of FIG. 7, and FIG. 9 is a schematic explanatory diagram showing the slurry recovery processing device.

Claims (2)

[Claims] (1) High-pressure water mixed with an abrasive material is injected from a nozzle to cut and dismantle the concrete structure of the reactor, and the cut pieces are used to open the peripheral edge of a bucket suspended in the cavity of the structure. The bucket is lowered into the bottom of the cavity by closing the periphery, and the bucket is opened at the center to transfer the cut pieces to a trolley, and the trolley is moved to the outside of the concrete structure. and store the cut pieces in a storage container, collect the slurry in a water collection pan directly below the cavity, separate and collect the abrasive material from the slurry, and solidify and dispose of it.
Concrete for a nuclear reactor, characterized in that the slurry from which the abrasive material has been separated is neutralized, coagulated and then settled to separate into sludge and water, the sludge is solidified and disposed of, and the water is led to waste liquid treatment equipment. Structure demolition processing method. (2) A truck that can freely rotate directly above the cavity of the concrete structure of the nuclear reactor, a turning device that rotates the truck, and three sheaves that are arranged on the truck at equal intervals around the circumference and have wires suspended therefrom; A lifting device for lifting and lowering the wire, and a bucket suspended from the wire via a buffer mechanism are provided, and the bucket has a regular hexagonal hopper-shaped main body and a peripheral edge that is pivotally connected to the upper opening edge of the main body. a peripheral edge formed in an arc shape; a central portion in the shape of an equilateral triangle pivotally attached to the lower opening edge of the main body;
A concrete demolition processing device for a nuclear reactor, characterized in that hydraulic cylinders are provided on the outside between the main body, a peripheral portion, and a central portion, respectively.