JPH0334839B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a cutting device for cutting the inner wall of a nuclear reactor.

(Technical background) Because the heat shielding wall, which is the inner wall of a nuclear reactor, is contaminated with radioactivity, it must be safely and reliably cut and transported when dismantled.

In particular, in order to cut the reactor wall appropriately depending on the shape of the reactor, the reactor wall contaminated with radioactivity cannot be accurately cut unless a cutting device is operated with precision.

(Object of the invention) The present invention has been devised in view of the above points, and
The object of the present invention is to provide a cutting device that can mechanically cut the inner wall of a nuclear reactor, a so-called concrete heat shield wall, efficiently and with high precision.

(Summary of the Invention) The cutting device of the present invention includes an enclosure provided in the upper part of a nuclear reactor, a movable box fixed to a main shaft suspended in the reactor from the upper side of the enclosure via a gantry and a lifting device, This movable box is equipped with vertical and horizontal cutting machines, which allow the contaminated reactor wall to be cut to a predetermined size and thickness by mechanical remote control regardless of the shape of the reactor. This makes it possible to cut into several cutting blocks.

(Example) Hereinafter, the cutting device of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a partially cutaway perspective view illustrating a nuclear reactor dismantling device.

To give an overview of the nuclear reactor dismantling equipment, an enclosure 10 is built on top of the nuclear reactor 1, and the reactor 1 is hermetically sealed.

A gantry 20 and a lifting device 30 are provided on the upper side 11 of this enclosure 10, and a main shaft 40 is suspended within the reactor 1 via these.

A cutting device 5 is installed at the lower end of this main shaft 40.
0 is provided, and the gantry 20, the lifting device 30 and the main shaft 40 act as a support drive for the cutting device 50. That is, as the elevating device 30 traverses, ascends and descends, and rotates, the cutting device 50 can also move horizontally and vertically via the main shaft 40, and can also rotate horizontally. Further, the cutting block cut by this cutting device 50 is gripped by a gripping device 100 provided on the main shaft 40 and carried out to the outside via a loading/unloading lock device 110 provided in the enclosure 10. be.

Note that airtightness is maintained between the enclosure 10 and the lifting device 30 by an airtight device that moves following the movement of the main shaft 40, thereby ensuring the airtightness of the dismantling device.

FIG. 2 is a partially omitted front view for explaining in more detail the cutting device 50 attached to the lower end of the main shaft 40 in the nuclear reactor disassembly equipment having the above configuration, and FIG. 3 is a plan view thereof. It is.

A movable box 6 is located at the lower end of the main shaft 40.
0 is placed.

The movable box 60 is fixed to the lower end of the main shaft 40 with its beam axis direction perpendicular to the main shaft 40, that is, the main shaft 40 and the fixed beam 61 form a substantially ⊥ shape, A pair of side columns 62, 62 are vertically disposed from both ends of a beam 61, and a movable floor 63 is constructed between the side columns 62, 62.

These side columns 62, 62 are constructed by fitting a telescopic frame 62b fixed to a movable floor 63 into a guide frame 62a fixed to a fixed beam 61, and connecting both with long screws 63c.
By rotating the long screw 63c with the servo motor 63d, the telescopic frame 62b is moved into or retreated from the guide frame 62a, and the movable floor 63 can be moved up and down.

Further, a vertical cutting machine 70 is attached to the lower surface of the fixed beam 61 via a turning device 71.

On the other hand, a transverse cutting machine 80 is attached to the upper surface of the movable floor 63 via a turning device 81. Both cutting machines 70 and 80 are configured to be rotated about the axis of the main shaft 40 by rotating devices 71 and 81. Also, on the upper surface of the fixed beam 61, the horizontal beam 9
0 and 90 are fixed to the main shaft 40, and outriggers 91 and 91 are formed at the ends of the beams. If these outriggers 91, 91 are extended and brought into contact with the cavity, the cavity receives the reaction force during cutting and when gripping the cutting block, thereby preventing the main shaft 40 from swinging.

Next, the driving state of the cutting device will be explained with reference to FIGS. 4 to 6.

FIG. 4 is a schematic side view of the cutting device.

That is, as described above, the vertical cutting machine 70 is fixed to the fixed beam 61 of the movable box 60 provided on the main shaft 40 via the rotating device 71. The vertical cutting machine 70 has an operating arm 72 attached to the rotating device 71, a first arm 73 is extendable from the operating arm 72, and a second arm 74 is extendable from the first arm 73. ing. A vertical cutting portion 75 is attached to the tip of the second arm 74. The vertical cutting part 75 is the stocker 7
A burning bar 77 supplied from 6 is held by an arm (not shown), and the inner wall of the reactor is cut in the vertical direction by burning the burning bar 77. An elevating cylinder 78 is interposed between the second arm 74 and the vertical cutting part 75, and this cylinder 78
to adjust the vertical angle.

Further, a shift cylinder 79 is provided in the vertical cutting portion 75 to adjust the shift in the vertical direction.

FIG. 5 is a diagram illustrating the operation of each arm of the vertical cutting machine 70 described above.

That is, the actuating arm 72 is rotated horizontally by the rotating device 71, and the first arm 73 is rotated by the feed motor M1 provided on the side surface of the actuating arm 72.
expand and contract. In addition, by driving the feed motor M2 built in the operating arm 72, the long screw m2
The second arm 74 inserted into the first arm 73 is expanded and contracted in the horizontal direction. So-called vertical cutting machine 7
0 is the rotation by the rotation device 71 and the main shaft 4
0 shift and telescopic movement in the horizontal direction by extension and contraction of each arm, and angle adjustment in the vertical direction by the elevation cylinder 78.Furthermore, the vertical cutting section 7 can be adjusted by the shift cylinder 79.
5 itself can be moved up and down.

On the other hand, as shown in FIG.
An arm 83 is inserted into this operating arm 82 to make it extendable and retractable.

A horizontal cutting part 84 is provided at the tip of the arm 83, and a burning bar 85 supplied from a stocker 86 is also held in this horizontal cutting part 84.
The angle with respect to the horizontal direction can be varied by the elevation cylinder 87.

Also, the transverse cutting portion 84 is cut by the shift cylinder 88.
It moves forward and backward.

FIG. 6 is a diagram illustrating the movement of each arm of the above-mentioned transverse cutting machine 80.

A feed motor M3 is built in the operating arm 82 attached to the turning device 81, and the drive of this feed motor M3 causes the arm 83 to move through the long screw m3.
is structured so that it moves forward or backward within the actuating arm 82.

As described above, the transverse cutting device 80
The main shaft 40
It can move in the horizontal direction by moving horizontally, moving the arm 83 back and forth, and moving the shift cylinder 88 back and forth. In addition, the movable floor 63 can be moved up and down by raising and lowering the main shaft 40 itself and expanding and contracting the side columns 62, 62 by driving the servo motor 63d.

As explained above, in the cutting device of the present invention, the vertical cutting device and the horizontal cutting device each rotate in the horizontal direction.
It becomes possible to freely move back and forth in the horizontal direction and move up and down, and also to set the cutting angle in the vertical and horizontal directions, and the movement can be adjusted accurately and minutely by remote control, making it possible to adjust the position of the reactor. It is extremely superior in that it can cut all parts appropriately regardless of the furnace shape.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view illustrating a nuclear reactor dismantling device, FIG. 2 is a partially cutaway front view illustrating a cutting device of the present invention, FIG. 3 is a plan view of the same, and FIG. 5 is a partially omitted diagram illustrating the driving state of the cutting device of the present invention, FIG. 5 is a diagram illustrating the arm drive of the vertical cutting machine, and FIG. 6 is a diagram illustrating the arm drive of the horizontal cutting machine. 1... Nuclear reactor, 10... Enclosure, 20
... Gantry, 30 ... Lifting device, 40 ... Main shaft, 50 ... Cutting device, 60 ... Movable box, 61 ... Fixed beam, 62, 62 ... Side column, 62a ... Guide frame, 62b ... ...Telescopic frame, 63...Movable floor, 70...Vertical cutting machine,
71...Swivel device, 75...Vertical cutting section, 76...
Stotzker, 80...Transverse cutting machine, 81...Swivel device, 84...Transverse cutting section, 86...Stotzker.

Claims (1)

[Claims] 1. A nuclear reactor in which an enclosure is provided in the upper part of the reactor, a main shaft inside the reactor is suspended from the upper side of the enclosure via a gantry and a lifting device, and a cutting machine is provided on the main shaft. In the inner wall cutting device, a movable floor is constructed on a pair of side columns vertically extending from both ends of a fixed beam fixed at the lower end of the main shaft with the beam axis direction perpendicular to the main shaft to form a movable box. and a cutting device for the inner wall of the reactor, which includes a vertical cutting machine on the fixed beam and a horizontal cutting machine on the movable floor. 2. The nuclear reactor inner wall cutting device according to claim 1, wherein the vertical and horizontal cutting machines are rotatably arranged around the axis of the main shaft. 3. The side pillar according to claim 1, characterized in that the side pillar is constituted by a guide frame suspended from an end of a fixed beam and an extensible frame suspended within the guide frame via a long screw. A device for cutting the inner wall of a nuclear reactor. 4. The cutting device for the inner wall of a nuclear reactor according to claim 1, characterized in that a horizontal beam is extended from the main shaft, and an outrigger is formed at the tip of the horizontal beam.