JP2001129716A - Cutting method for large-sized cylindrical container, apparatus, or piping, and device for practicing the cutting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut transversally a large-sized cylindrical container, an apparatus, or piping over 250 mm in diameter, and eliminate the fear of a fire in work in a green house, and the fear of diffusion of radioactive materials due to the damage to the green house by the fire, and further provide a cutter which is lightweight-compact to be easily removed and which can be carried into a narrow room inside such as a cave, a cell, a duct in a controlled area to perform the cutting work. SOLUTION: A large-diameter cylindrical container, an apparatus or a pipe, etc., 1 is rotatably supported on rollers 2, and a cutter body 4 is fixed on the circular surface of the cylindrical container, the apparatus or the piping, etc., 1 by means of a chain which is to be engaged with a motor-operated sprocket 7 provided above the cutter body 4. The cutter body 4 is driven, and then a tip saw 9 is driven, and thus the cylindrical container, etc., can be cut at a fixed operating position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a nuclear power plant or R
The cutting method used when dismantling and removing cylindrical containers, equipment or pipes of a large diameter with a diameter of about 250 mm or more used in facility I (hereinafter, simply referred to as cylindrical containers, etc.) and implementing this method It is related to the device that performs.

[0002]

2. Description of the Related Art In dismantling or removal work in nuclear facilities or RI facilities, most of the equipment to be dismantled is contaminated with radioactivity. For this reason, it has to be carried out in a limited work place in the management area, for example, a green house made of vinyl acetate sheet. Therefore, in the work of dismantling and removing the equipment to be dismantled, use cutting equipment that uses fire to prevent the occurrence of fire, or use a grinding wheel with high-speed rotation to prevent the scattering of radioactive dust and sparks Use of such cutting equipment is severely restricted. In particular,
In nuclear fuel reprocessing facilities, there is a possibility that nuclides such as organic solvents (TBP, dodecane, DBP, etc.) and plutonium may remain inside the dismantling equipment. There is a risk of ignition and scattering.

As described above, the use of fire is limited in the dismantling of large cylindrical containers and the like, so that a portable fixed band saw or the like is used up to a diameter of about 300 mm, and a chain fixed pipe saw or the like is used up to a diameter of about 350 mm. Can be cut and dismantled. However, above that, cutting equipment, for example, an operator must hold a hand-held tip saw and cut it directly against the dismantling equipment. In this case, if the plate thickness of the object to be cut is thin and the internal structure is simple, work can be performed safely. However, unless the plate thickness is 5 mm or more, or the internal structure is complicated and the cutting depth is 50 mm or more, If they could not be separated, the cutting and dismantling work was very unsafe and difficult. In addition, the worker shall ensure safe work due to the rotating centrifugal force of the blade of the cutting device, the reaction force at the time of cutting, and the unsafe movement of the cutting device caused by the blade biting into the cut object, etc. And the accumulation of work fatigue was a problem.

Until now, there has been a cutting device capable of cutting a large cylindrical container or the like having a diameter of about 250 mm or more into round slices to a cutting depth of about 100 mm in a state where the cutting device is fixed to an object to be cut without using fire. Did not.

[0005]

1) The cutting of a large cylindrical container having a diameter of about 250 mm or more can be performed without using fire. 2) Make the cutting equipment fixed to the cutting object and movable,
3) Cutting with a normal cutting whetstone generates a large amount of sparks and dust. To prevent this, the generation of sparks and radioactive dust during cutting should be minimized. 4) The cutting equipment facilitates lightweight, compact mounting and removal,
To be able to carry out cutting work by carrying it into a narrow room such as a cave, cell or duct in a controlled area, or even from a narrow door. To provide a cutting method and apparatus capable of performing the above items. With the goal.

[0006]

Means for Solving the Problems 1) Large-diameter cylindrical container and the like 1
Is rotatably supported on a roller, and a cutting machine main body 4 that can run on the peripheral surface is mounted on the peripheral surface of the cylindrical container 1 or the like, and an electric motor driven sprocket provided on the cutting machine main body 4 is provided. The cutting machine body 4 and the cylindrical container 1 are integrated with the chain 3 around the circumference of the cylindrical container 1 and the like, and the tip saw 9 connected to the cutting machine body 4 while driving the chain 3
By driving, the cylindrical container and the like can be cut. 2) Further, the tip saw 9 connected to the cutting machine main body 4 in the above 1) can be cut at the same place by pressing the tip saw 9 against the cylindrical container 1 or the like. 3) a plurality of rollers 2 for rotatably mounting an apparatus for performing the methods 1) and 2) on a large-diameter cylindrical container or the like 1;
A cutting machine body 4 with a roller movably mounted on the upper periphery of a cylindrical container 1 or the like, a rotatable screw bar 5 erected on the cutting machine body 4, and a screw bar screwed to the screw bar 5. 5, a sprocket 7 that moves up and down via a nut that moves up and down and is rotatably driven by an electric motor, a chain 3 that meshes with the sprocket 7 and is wound around the peripheral surface of the cylindrical container 1 and the like, and a rear end of the cutting machine body 4. And a tip saw 9 pin-connected to the chip saw. 4) In the above device 3), the chain 3 is formed by connecting a plurality of links 13, and each link 13 has a rectangular link body 13 and a rectangular link body 1
One of the three sides is a connecting rod 14 with an adjacent link body, and the other side opposite to the connecting rod 14 is a connecting groove 15 into which the connecting rod 14 fits. The upper part of the connecting groove 15 holds the connecting rod 14 from above. It has an opening 16 that can be inserted and removed.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 in FIG.
Is a large-diameter cylindrical container having a diameter of about 250 mm or more. Reference numeral 2 denotes a roller on which a cylindrical container or the like 1 is mounted so as to be freely rotatable thereon. Reference numeral 3 denotes a dedicated chain, which is wrapped around the cylindrical container 1 or the like, and meshes with a sprocket 7 provided on the cutting machine body 4 at the upper part. Reference numeral 5 denotes a screw rod 5 erected on the cutting machine main body 4. The sprocket 7 is rotatably mounted on a shaft that protrudes laterally from a nut (not shown) that is screwed to a threaded bar 5 erected adjacent to the sprocket 7. The sprocket 7 can be moved up and down via a nut that moves up and down by rotating the screw rod 5. 5 'is a handle for turning the screw rod 5 to adjust the tension of the chain 3. The cutting machine body 4 can travel on the cylindrical container 1 or the like 1 with four wheels 6. Reference numeral 8 denotes an electric motor for driving a sprocket. The electric motor rotates the sprocket 7, drives the chain 3 meshing with the sprocket 7, and rotates the cylindrical container 1 and the like.

Reference numeral 9 denotes a pin 1 at one end (rear part) of the cutting machine body 4.
The tip saw connected at 0 is capable of swinging up and down around the pin 10, that is, in the radial direction of the cylindrical container 1 or the like. The tip saw 9 has a blade 11 driven by an electric motor (not shown). Reference numeral 12 denotes a pressing handle for manually pressing the tip saw 9 against the cylindrical container 1 or the like.

With the above arrangement, when the electric motor 8 is driven and the driving force in the direction of the arrow a in FIG. 1 is transmitted to the chain 3 meshing with the sprocket 7 by the sprocket 7, the apparatus body 4 tries to move forward. However, when the apparatus main body 4 is manually pressed through the handle 12, only the cylindrical container 1 is rotated by the roller 2, so that the cutting can be performed only by the worker pressing the same place at the same place. Of course, besides the operator who operates the electric motor 8,
This is a two-person operation of the operator who presses the tip saw 9.

FIG. 2 is a partial view of the dedicated chain 3. The link body 13 of the chain 3 has a rectangular shape, and one side of the link body 13 is a cylindrical connecting rod 14, and a side facing the connecting rod 14 is a connecting groove 15 into which the connecting rod 14 of an adjacent link fits. The connecting groove 15 has an opening 16 at an upper portion, through which the connecting rod 14 can be inserted and removed. Therefore, since the length of the chain 3 can be easily changed by attaching and detaching the link 13, it is possible to easily cope with a change in the diameter of the cylindrical container 1 or the like.

FIG. 3 illustrates a method of attaching and detaching a link.
4 from the upper opening 16 of the connecting groove 15 (FIG. 3).
(A)) Then, if the link is rotated 90 °, the link is connected (FIG. 3 (b)). Departure is possible in the reverse way.

[0012]

According to the first aspect of the present invention, even in a large-diameter cylindrical container or the like, the cutting machine main body is integrated with the cylindrical container or the like by a chain by operating the electric motor on the cutting machine main body and the electric motor on the tip saw side. Therefore, it is possible to safely cut the inside of the green house with the tip saw while rotating the cylindrical container or the like. 2) According to the second aspect, by holding the tip saw against the cylindrical container or the like, only the cylindrical container or the like rotates, and the cutting operation can be performed at a fixed position, so that the operation can be performed safely. 3) According to the third aspect of the present invention, the tip saw is easily moved up and down even on the periphery of the cylindrical container or the like because the tip saw is integrated with the cylindrical container or the like via a chain in the cutting machine main body and the tip saw is pin-connected to the cutting machine main body. Since the shape can be followed, safe work can be secured at a fixed position. 4) According to the fourth aspect, since the links constituting the chain can be easily connected or separated, it is possible to cope with a change in the diameter of a cylindrical container or the like.

[Brief description of the drawings]

FIG. 1 is a side view of a cutting device according to the present invention.

FIG. 2 is a partially exploded view of a chain.

FIG. 3 is an explanatory view of a method of inserting and removing a chain.

FIG. 4 is an explanatory diagram of a state in which a cutting operation is being performed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Large-diameter cylindrical container, apparatus or piping (diameter of about 250 mm or more) (cylindrical container etc.) 2 Roller 3 Dedicated chain 4 Cutting machine main body 5 Screw rod 5 'Handle 6 Wheel 7 Sprocket 8 Electric motor 9 Tip saw 10 Pin 11 Blade 12 Handle 13 Link body 14 Connecting rod 15 Connecting groove 16 Upper opening (of connecting groove)

Claims (4)

[Claims] 1. Large-diameter cylindrical container, equipment, piping, etc.
Is rotatably supported on a roller, and a cutting device main body (4) that can run on the peripheral surface is placed on the peripheral surface of the cylindrical container, device, pipe, or the like (1), and the cutting machine main body (4) is mounted. ) The large-diameter cylindrical container meshed with the motor-driven blocket provided above;
A chain wrapped around equipment or piping (1)
The cutting machine body (4) is integrated with the large-diameter cylindrical container, equipment or piping (1), and drives the chain (3) and also drives the tip saw (9) connected to the cutting machine body (4). A method for cutting a large-diameter cylindrical container / equipment or piping, which can cut a cylindrical container or the like. 2. The cutting machine according to claim 1, wherein the tip saw connected to the cutting machine body is pressed at the same place by pressing the tip saw against a large-diameter cylindrical container, equipment or piping. For cutting large diameter cylindrical containers / equipment or piping. 3. A large-diameter cylindrical container, equipment or piping, etc.
Rollers (2) for rotatably mounting the roller, a cutter-equipped cutting machine body (4) that is mounted so as to be able to run on the upper periphery of a cylindrical container, equipment, or piping (1), and a cutting machine body (4)
A rotatable screw rod (5) standing upright and a screw rod (5)
And a sprocket (7) that moves up and down through a nut that moves up and down by the rotation of a screw rod (5) and is rotatably driven by an electric motor, and a sprocket (7) that meshes with the sprocket (7). A cutting device for a large-diameter cylindrical container / equipment or pipe, comprising a chain (3) wound around the peripheral surface and a tip saw (9) pin-connected to the rear end of the cutting machine body (4). 4. A chain (3) comprising a plurality of links (13).
Each link (13) has a link body (13) having a rectangular shape, and a rectangular link body (13).
One side is a connecting rod (14) with the adjacent link body, and the other side facing the connecting rod (1) is a connecting groove (1) in which the connecting rod (14) fits.
5) The large diameter according to claim 3, wherein the connecting groove (15) has an opening (16) through which the connecting rod (14) can be inserted and removed from above. Cutting equipment for cylindrical containers / equipment or piping.