JPH0572997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a dismantling apparatus suitable for dismantling a nuclear reactor.

(Prior art) In dismantling a nuclear reactor, cutting and disassembling a concrete heat shield wall (hereinafter referred to as a reactor wall) contaminated with radioactivity, human bodies and the atmosphere are contaminated with radioactivity. Must not be. Therefore, it is necessary to cut the reactor wall continuously and accurately while the reactor is shielded, and to transport the cut reactor wall blocks mechanically and safely. Therefore, a main shaft is installed vertically inside the reactor, and mechanical devices such as cutting devices and unloading devices are installed through this main shaft, and these devices are controlled mainly by the main shaft to dismantle the devices. It has been proposed.

(Problem to be solved by the invention) However, when the diameter of the nuclear reactor is small, it is difficult to arrange the above-mentioned plurality of mechanical devices on the main shaft and operate them simultaneously and smoothly. Mutual interconnection control must be complicated, and the mechanical devices themselves must be miniaturized. If the mechanical equipment is made smaller, the demolition power inevitably decreases, and a drive source must be provided to increase the power, which presents many problems.

(Means for solving the problem) The dismantling device of the present invention was devised to solve the above problem, and when mechanical devices are alternately introduced into the main shaft vertically installed in the furnace, The structure is such that the main shaft is gripped and mounted by a fixed mounting piece attached to the main body of the mechanical device and a pair of movable mounting pieces that open through a cylinder. This makes it possible to cut the reactor wall blocks and transport the reactor wall blocks, thereby improving the efficiency of dismantling work and reliably preventing contamination by radioactivity.

(Example) Hereinafter, the nuclear reactor disassembly apparatus of the present invention will be explained in detail based on the drawings.

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

This nuclear reactor dismantling equipment is provided with a shielding building 10 above a nuclear reactor 1, a gantry frame 11 and a lifting device 12 are installed inside the shielding building 10, and a cavity 14 is installed via the lifting device 12 and a rotating table 13.
The main shaft 20 is vertically installed inside.
The main shaft 20 is vertically installed eccentrically with respect to the center axis of the swivel base 13 and is rotated by the swivel base 13.

A horizontal cutting machine 30 is fixed to the lower part of the main shaft 20, and two mechanical devices, a so-called vertical cutting machine 40 and a gripping machine 50, are fixed to the upper part of the gantry frame 11 in a state corresponding to the central axis of the turning table 13. Stored. Therefore, the main shaft 20 is the swivel base 1
3, it comes close to either the vertical cutting machine 40 or the gripping machine 50, and in this close state, the vertical cutting machine 40 or the gripping machine 50 is introduced into the main shaft 20 and is lifted and lowered. death,
It performs cutting, gripping and carrying out operations.

2 to 4 are schematic diagrams illustrating the structure of the vertical cutting machine 40 as one mechanical device and its mounting structure.

As shown in the schematic side view of FIG.
The main body 41 is provided with a pair of mounting parts 42, 42, and a burning bar 45 is held by a holder 44 provided at the tip of an operating arm 43 below. This vertical cutting machine 40 is mounted on the main shaft 20 by the mounting parts 42, 42 and introduced. or,
Sheave block CR provided at the top of the main body 41
It is raised and lowered along the main shaft 20 by a wire R via. At a predetermined cutting position, the actuating arm 43 extends horizontally, and the vertical angle is adjusted by the elevating cylinder 46 to cut the back side of the furnace wall by the combustion injection of the burning bar 45.

The mounting portions 42, 42 of the vertical cutting machine 40 will be explained in more detail with reference to the side schematic diagram in FIG. 3 and the plan schematic diagram in FIG. 4.

The mounting portion 42 includes a fixed mounting piece 42a provided on the main body 41 and a pair of movable mounting pieces 42b and 42c. The movable mounting pieces 42b and 42c are opened and closed by cylinders 42d and 42e, respectively. The fixed mounting piece 42a is a curved piece having an inner diameter approximately equal to the outer diameter of the main shaft 20, while the movable mounting pieces 42b and 42c are similarly formed into curved pieces having a diameter equal to the outer diameter of the main shaft 20. has been done. When the movable mounting pieces 42b, 42c are closed, each mounting piece 42a, 42b, 42c forms a hollow having the same diameter as the main shaft 20. Therefore, when introducing the vertical cutting machine 40 into the main shaft 20, the movable mounting piece 42 is moved by driving the cylinders 42d and 42e.
b and 42c are opened, and with one side of the main shaft 20 in contact with the fixed mounting piece 42a (as shown by the dotted line in FIG. 4), the movable mounting pieces 42b and 42c are opened.
When it is closed, it is installed and introduced into the main shaft 20 by the fixed mounting piece 42a and the movable mounting pieces 42b and 42c.

FIG. 5 is a schematic side view illustrating the stored state of the vertical cutting machine 40 stored in the upper part of the gantry frame 11.

As described above, the main shaft 20 is vertically installed via the lifting device 12 and the swivel table 13 provided on the upper part of the gantry frame 11. Similarly, a vertical cutting machine 40 is housed in the upper part of the gantry frame 11. The vertical cutting machine 40 has a main body 4
The slide base is suspended by a wire R via the sheave block CR provided at the top of the gantry frame 11, and is installed inside the upper side of the gantry frame 11.
It is held integrally with the slide base SB by pulling the wire R using the winch W of the SB and applying a reaction force to the center cylinder CP. Therefore, if the slide base SB itself is moved horizontally, the vertical cutting machine 40 will also be moved horizontally without swinging.

FIG. 6 is a schematic side view illustrating a gripping machine 50, which is another mechanical device. This gripping machine 50 has a main body 5
A mounting part 52 is provided on the side of the main body 51, while an arm 53, a rotary motor M provided at the tip of the arm 53, and a shaft 5 hanging vertically from the rotary motor M are provided at the lower part of the main body 51.
4, and a gripping arm 56 is formed via an elevation cylinder 55. This gripping machine 50
Similarly to the vertical cutting machine 40 described above, the cutting machine 40 is also installed and introduced into the main shaft 20 using the mounting section 52.

As shown in the schematic side view of FIG. 7 and the schematic plan view of FIG.
These movable mounting pieces 52b and 52c are formed so that they can be opened and closed by cylinders 52d and 52e. Further, the fixed mounting piece 52a and the movable mounting pieces 52b and 52c have the same shape as each mounting piece of the vertical cutting machine 40 described above, and when closed, form a hollow with an inner diameter approximately equal to the outer diameter of the main shaft 20. do. Moreover, the attachment to the main shaft 20 is the same, as shown by the two-dot chain line in FIG. It closes the mounting pieces 52b and 52c.

Next, we will explain the case of introducing the mechanical device into the main shaft 20 and the case of releasing the introduction and storing it in a predetermined position.
Since 0 is used, the explanation will be based on FIGS. 2 to 5. When introducing it to the main shaft 20 first,
A sheave block provided in advance on the upper part of the main body 41
The wire R is pulled by a winch W through the CR,
It is held by the reaction force of the center cylinder CP. Then, the slide cylinder SC is operated to horizontally move the slide base SB into the upper surface of the gantry frame 11. Then, the vertical cutting machine 40 will be in a state close to the main shaft 20. In this state, the cylinders 42d and 42e are respectively driven to open the fixed mounting pieces 42b and 42c.
Next, the slide base SB is moved until one side of the main shaft 20 comes into contact with the fixed mounting piece 42a. The main shaft 20 is attached to the fixed support piece 42a.
When one side of the cylinders 42d and 42e come into contact with each other,
is driven to close the movable mounting pieces 42b and 42c. Therefore, the vertical cutting machine 40 is installed on the main shaft 20 by the mounting part 42 and is in an introduced state.

In this state, the winch W is driven to loosen the wire R, and the vertical cutting machine 40 is lowered to a predetermined position. Next, when the vertical cutter 40 finishes cutting the back surface, the winch W winds up the wire R and raises it. Then, the slide base SB is held integrally by the tension of the wire R and the reaction force from the center cylinder CP, the cylinders 42d and 42e are driven to open the movable mounting pieces 42b and 42c, and the slide cylinder SC is driven. Move the slide base SB to its original storage position.

The above explanation is for the vertical cutting machine 40, but the gripping machine 50 also cuts the main shaft 2 by the same method.
0 and released from the installation. However, the longitudinal cutting machine 40 and the gripping machine 50 are simultaneously operated on the main shaft 2.
If either one is introduced without being introduced into the gantry frame 11, the other one is stored at a required position on the upper surface of the gantry frame 11.

(Effects of the Invention) As explained above, according to the disassembly apparatus of the present invention,
Mechanical devices such as longitudinal cutters and grippers can be easily introduced and released from the main shaft.
Therefore, by alternately controlling the introduction and release of each mechanical device into the main shaft, even when dismantling a reactor with a small reactor diameter, the cutting process, replacing the burning bar stocker, and even removing the reactor wall block can be simplified. The demolition work is carried out continuously and mechanically, making it possible to achieve safe and efficient demolition work. Moreover, the period of demolition work is shortened and the demolition equipment itself is simplified, so the total cost of demolition work can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view illustrating the nuclear reactor dismantling equipment, Fig. 2 is a schematic side view illustrating the structure of the vertical cutting machine, and Fig. 3 is a schematic side view illustrating the installation part of the vertical cutting machine. 4 is a schematic plan view of the same plane, and FIG. 5 is a schematic side view illustrating the stored state of the vertical cutting machine.
FIG. 6 is a side schematic diagram illustrating the structure of the gripping machine;
FIG. 7 is a schematic side view illustrating the attachment part of the gripper, and FIG. 8 is a schematic plan view thereof. 1... Nuclear reactor, 11... Gantry frame,
13... Swivel base, 20... Main shaft, 40
...Vertical cutting machine, 41...Main body, 42, 42...Mounting section, 42a...Fixed mounting piece, 42b, 42c...
...Movable mounting piece, 42d, 42e...Cylinder, 5
0... Gripping machine, 51... Main body, 52... Mounting part,
52a...Fixed mounting piece, 52b, 52c...Movable mounting piece, 52d, 52e...Cylinder.

Claims (1)

[Scope of Claims] 1. A gantry frame is provided in the nuclear reactor, a main shaft is suspended 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. Dismantling equipment for a nuclear reactor, in which a mechanical device is mounted on a main shaft by a fixed mounting piece attached to a main body of the mechanical device and a pair of movable mounting pieces opening through a cylinder. 2. The nuclear reactor dismantling apparatus according to claim 1, wherein the mechanical device is a vertical cutting machine or a gripping machine. 3. The nuclear reactor disassembly apparatus according to claim 1, wherein the fixed mounting piece and the pair of movable mounting pieces form a hollow having an inner diameter approximately equal to an outer diameter of the main shaft.