JPH0572998B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a housing structure for a mechanical device used for dismantling work in an apparatus for dismantling a concrete heat shielding wall of a nuclear reactor.

(Prior art) When dismantling a nuclear reactor, cutting and dismantling the so-called radioactively contaminated concrete heat shield wall (hereinafter referred to as the reactor wall), human bodies, the atmosphere, etc. are completely protected from radioactive contamination. must be done.

Therefore, the reactor itself is shielded, mechanical devices such as vertical and horizontal cutting machines and gripping machines are installed on the same main shaft installed vertically inside the reactor, and dismantling equipment is installed to control these mechanical devices by remote control. It has been devised.

(Problems to be Solved by the Invention) The above-mentioned dismantling apparatus is equipped with mechanical devices such as a vertical and horizontal cutting machine and a gripping machine on one main shaft, and is operated according to a predetermined control program. However, in order to dismantle a nuclear reactor with a small reactor diameter, the entire dismantling equipment must be made smaller, and each mechanical device itself must be made smaller in order to operate smoothly. If the mechanical equipment itself is miniaturized, its dismantling capacity will naturally decrease, and this poses the problem of having to significantly increase its power in order to maintain the dismantling capacity as before.

(Means for solving the problem) The present invention was devised to solve the above problem, and each mechanical device is stored on the upper side of the gantry frame, and when in operation, it is introduced into the main shaft and lifted and lowered. It is something that makes you In other words, a wire is suspended between the sheave block attached to the main body of the mechanical device and a winch installed on a slide base installed inside the upper side of the gantry frame, and when storing the wire, the wire is pulled by operating the winch. , is a storage structure that holds the slide base and mechanical device integrally by the reaction force of a center cylinder provided on the lower surface of the slide base.

Due to the storage structure of these mechanical devices, they are stored in a predetermined storage location when not in operation, and when in operation they can be smoothly introduced into the main shaft from the storage location and lowered to a predetermined operating position.
Therefore, even when dismantling a reactor with a small reactor diameter, the minimum number of mechanical devices installed in the main shaft is sufficient, so if the mechanical devices are introduced alternately as appropriate, the dismantling equipment and the mechanical devices themselves can be reduced in size.
Demolition work is carried out efficiently.

(Example) Hereinafter, the disassembly structure of the mechanical device of the present invention will be explained based on the drawings.

FIG. 1 is a schematic front view illustrating a nuclear reactor dismantling device.

In the nuclear reactor dismantling apparatus of the present invention, a shielding building 10 is provided in the nuclear reactor 1. Inside this shielding building 10, a gantry frame 11 which also serves as a primary enclosure and a lifting device 12 are provided. The elevating device 12 has a main shaft 20 vertically disposed within the cavity 14 via a swivel table 13 provided at a lower portion thereof. The turning table 13 turns around the central axis of the cavity 14. On the other hand, since the main shaft 20 is vertically installed in an eccentric state with respect to the rotation axis of the swivel table 13, when the swivel table 13 is turned, the main shaft 20 turns eccentrically within the cavity 14.

Furthermore, a transverse cutting machine 3 is installed at the bottom of the main shaft 20.
0 is fixed. The transverse cutting machine 30 rotates horizontally around the main shaft 20 and can adjust its angle in the vertical direction. On the other hand, the other mechanical devices, a vertical cutting machine 40 and a gripping machine 50, are housed in the upper part of the gantry frame 11 so as to face each other with the swivel table 13 at the center.

That is, as shown in FIG. 2, which is a plan view taken along the line A--A in FIG. When the swivel base 13 is rotated by this,
The main shaft 20 is close to either the vertical cutting machine 40 or the gripping machine 50, and in such a close state, the vertical cutting machine 40 or the gripping machine 50 is installed on the main shaft 20 and introduced. .

FIG. 3 shows the vertical cutting machine 40 connected to the main shaft 20.
FIG. 3 is a schematic side view showing a state in which the device is introduced into the device and lowered.

When the vertical cutting machine 40 descends along the main shaft 20 and cuts the back side of the furnace wall, the gripping machine 5
0 is stored in a predetermined position on the gantry frame 11. On the other hand, when installing the gripping machine 50 on the main shaft 20, the vertical cutting machine 4
0 is lifted, released from the main shaft 20, and stored at a predetermined position within the gantry frame 11.

As described above, the vertical cutting machine 40 and the gripping machine 50, which are mechanical devices, are introduced into the main shaft 20 alternately,
When either one is installed, the other mechanical devices are stored in predetermined locations on the gantry frame 11.

FIG. 4 is a schematic side view showing the vertical cutting machine 40 and gripping machine 50 in a stored state.

A main shaft 20 is vertically installed via a lifting device 12 and a turning table 13 provided on the upper part of the gantry frame 11, and a vertical cutting machine 40, a gripping machine 50, and a carrying machine 60 etc. are installed on the upper part of the gantry frame 11. Each is stored and deployed. Both the vertical cutting machine 40 and the gripping machine 50 are suspended by a wire R via a sheave block CR attached to the upper part of the main body. Further, a slide base SB is provided inside the upper side of the gantry frame 11, and a winch W is provided on the lower surface of the slide base SB. This winch W winds up or unwinds the wire R. That is, the wire R is wound up to raise the mechanical device, and the wire R is unwound to lower it.

On the other hand, a center cylinder CP that drives downward is provided on the lower surface of the slide base SB.
This center cylinder CP presses the mechanical device downward with a telescoping rod. On the other hand, if the wire R is wound up and pulled by the winch W, the mechanical device will rise, so if the telescopic rod of the center cylinder CP is driven downward as described above to press the mechanical device,
A reaction force corresponding to the tension of the wire R is generated, and the mechanical device itself is held integrally with the slide base SB.
Also, on the inner side of the upper side of the gantry frame 11, there are grooves 11a for horizontally moving the slide base SB.
11a is provided, and the slide base SB moves inside the grooves 11a and 11a by driving the slide cylinder SC.
slides freely forward and backward.

That is, FIG. 5 is a partially cutaway plan view.

With the grooves 11a, 11a aligned with the grooves 13a, 13a provided in the swivel base 13, the slide cylinder SC is operated to remove the slide base SB.
By moving horizontally, it is possible to advance from inside the gantry frame 11 to inside the turning table 13.

Therefore, when introducing a mechanical device to the main shaft 20, as described above, the slide cylinder SC is operated to move the slide base SB into the swivel base 13, and the main shaft 20 is mounted at the mechanical device mounting section. Thereafter, when the wire R is loosened by the winch W, it is released from the stored state and introduced into the main shaft 20. When the wire R is further unwound, the mechanical device is lowered. In addition, when the mechanical device and the main shaft 20 are to be unattached and stored, the slide cylinder SC may be driven to the opposite state to the above, and the slide base SB may be retreated.

(Effects of the Invention) As explained above, when the mechanical device is not in operation, the functional device storage structure of the present invention allows the winch to be wound up and integrated with the slide base by the reaction force of the center cylinder against the tension of the wire R. is maintained. Therefore, the mechanical device itself does not swing, and the mechanical device itself does not interfere with the operation of other mechanical devices.

On the other hand, when the mechanical device is introduced into the main shaft and operated, since it is held integrally with the slide base, it can be reliably adapted to the main shaft without swinging. Therefore, by bringing the slide base close to the center cylinder via the slide cylinder, it becomes possible to mount the slide base extremely easily.

In addition, it is easy to install mechanical devices on the main shaft only when it is in operation, so there is no need to install an unnecessarily large number of mechanical devices on the main shaft, and it is easy to use when dismantling a reactor with a small diameter. can also exert maximum power.

[Brief explanation of the drawing]

Figure 1 is a schematic front view illustrating the nuclear reactor dismantling equipment, Figure 2 is a plan view taken along the line A-A in Figure 1, and Figure 3 is a diagram showing the operation of mechanical equipment and other machinery. FIG. 4 is a schematic side view showing the stored state of the apparatus; FIG. 4 is a schematic side view illustrating the stored state of the vertical cutting machine and gripping machine; and FIG. 5 is a partially cutaway plan view. 1... Nuclear reactor, 11... Gantry frame,
12...Lifting device, 13...Swivel base, 20...Main shaft, 40...Vertical cutting machine, 50...Gripping machine, CR...Sheave block, R...Wire, W
...Winch, CP...Center cylinder, SB...
...Slide base, SC...Slide cylinder.

Claims (1)

[Claims] 1. A gantry frame is provided in the nuclear reactor, a main shaft is vertically installed in the reactor via a lifting device provided on the gantry frame, and a mechanical device is introduced into the main shaft to raise and lower it. In nuclear reactor dismantling equipment, a wire is suspended between the sheave block attached to the main body of the mechanical equipment and the winch installed on the slide base installed on the upper side of the gantry frame, and the winch is attached to the bottom surface of the slide base. is a storage structure for mechanical equipment characterized by having a center cylinder that drives downward. 2. The storage structure for a mechanical device according to claim 1, wherein the mechanical device is moved up and down along a main shaft by winding up or unwinding a winch provided on a slide base. 3. The storage structure for a mechanical device according to claim 1 or 2, wherein the slide base is arranged so as to be able to move forward and backward relative to the main shaft within the upper side of the gantry frame.