JPS58102623A - Cutting of pipe - Google Patents

Abstract

PURPOSE:To prevent falling down of chips into a pipe during cutting by arranging the first magnet for storing chips in the vicinity of the cut position on the periphery of a magnetic pipe, and carrying-out cutting, and inserting the second magnet onto which chips adhere, into the pipe after cutting. CONSTITUTION:In the method for cutting a pipe which is laid down as a variety of piping for a heat exchanger etc., a magnet 11 is installed in the vicinity of a cut position 10a on a pipe 10. Said pipe is cut at the cut position 10a by using a cutting tool such as metal sawing machine etc. Although chips 12 are formed during cutting and tend to fall down into the pipe, said chips are held on the inner wall of the pipe by the magnet 11. After cutting is completed, the second magnet 13 is inserted to discharge chips 12 from the cut position 10a on the pipe 10. The chips are allowed to adhere onto the magnet 13, and then the magnet 11 outside the pipe is taken out. Then, the chips 12 is discharged by pulling out the magnet 13 outside the pipe, and thus the cutting operation is completed.

Description

[Detailed description of the invention] This invention relates to an improvement in the method of cutting a broken pole.

In many cases, it is necessary to cut and remove existing piping for heat exchangers, etc. and various plants, etc. from the secondary pipe in order to replace them.

For example, if damage such as corrosion occurs in a spoiler tape in a gay lathe, this is cut and removed.

However, the gaylar tube is usually attached to the header or connected to the drum, and as shown in Fig. 1, when the gaylar tube 2 is cut from the outside with a hacksaw, the chips 3 are removed from the gaylar tube 2. It falls into the interior and accumulates in the pipe header (not shown). As a result, as the steam circulates, it enters the valves, instruments, and turbines in the piping, causing a major problem in the maintenance and management of steam plants such as thermal power generation.The present invention solves these conventional drawbacks and The overall purpose is to provide a method for cutting pipes that prevents powder from falling into the pipe. The structure of the present invention that achieves this object is such that a first magnet for holding chips is arranged around the cutting point of a pipe made of a magnetic material, and then the pipe is cut, while the inside of the pipe after being cut is A second magnet tube is inserted to attach the cutting powder to the mold, and the cutting powder is discharged by t% of the mold.

Hereinafter, a specific example of the pipe cutting method of the present invention will be described in detail with reference to the drawings.

In the tube cutting method of the present invention, if the tube is made of a magnetic material, the chips are also magnetic, so a magnet placed outside the tube is used to prevent the chips from falling during cutting. After cutting is completed, another magnet is inserted into the tube to attach the chips and discharge them.

Therefore, first, the case of cutting one existing f in the vertical direction will be explained based on FIGS. 2(a) (bJ).

Assuming that the outer diameter of the pipe 1o to be cut is about 38, the first magnet 11 to be installed on the outer periphery of the vlo is a ring-shaped magnet with an axial length of 50 to 80 was and a thickness of about 20 mm. For installation, use a half-shaped piece. The cut #rK is installed so that the upper end of the magnet 11 is located near the cut point 10a of the pipe 10, that is, about 50 mm below the cut point 10a.

Thereafter, the cutting portion 1 oat is cut using a cutting tool such as a hacksaw (not shown). This cut cuts 9
Powder 12 is generated and tries to fall inside the tube, but is held on the inner wall of the tube by the magnet 11. After the cutting is completed in this manner, a second magnet 13 is inserted to discharge the chips 12 from the cut location lO& of the tube 10. This second magnet 13 is attached to the front part of the handle 13m so as not to hit the tube wall when inserted, and is about 10 mm longer than the first magnet 11.
Use one in 0 tone. In addition, the strength of the magnet is also the same as that of the first magnet 1.
It is preferable to make the second magnet 13 stronger than the first magnet.

When the second magnet 13 is inserted to a position where the chips 12 can be attached, the chips 12 are attached to the magnet 13 and the magnet 11 outside the tube is removed.
The second magnet 13 is pulled out of the tube, the cutting chips 12 are discharged, and the cutting operation is completed.

Note that the first magnet 11 and the second magnet 13 may be permanent magnets or electromagnets.

Next, 1128A is performed regarding the case where only one of the pipes 2o is lined up as shown in FIG. 3 is to be cut.

In this case, since the distance between the tubes 20 is small and the halved first magnet 21 cannot be installed outside the tube, a halved first magnet 21 is used in which the part interfering with the adjacent tube is cut out. . The second magnet for discharging the chips 22 is a second magnet.
The cutting process may be similar to that shown in FIG. 3(b), and the cutting process is also the same, so a description thereof will be omitted.

In addition, when cutting the pipes 30 arranged side by side as shown in FIG. 4 (aJ (bJ), a plurality of magnets, for example, three
- A set of half-shaped magnets 31 manufactured in an unusual shape is used.

In this case, if the number of IMi is increased, the possibility of the chips falling when the magnet 31 outside the tube is removed and the chips are discharged by the second magnet increases, so 3 roots is appropriate. Although not shown, three magnets are attached to the tip of the handle as a second magnet to be inserted into the tube.
It may also be possible to simultaneously discharge cutting dust from the inside of the book tube.

In the above-described examples, the tubes 10, 20, and 30 are arranged vertically, but cutting can be performed in the same manner even when the tubes 10, 20, and 30 are arranged horizontally. In this case, scattering of chips in the longitudinal direction of the pipe is prevented. In addition, the material of the tube to which this method can be applied must be a magnetic material such as carbon steel or alloy steel that prevents cutting dust from adhering to the magnet.

As described above in detail with reference to the embodiments, according to the method of the present invention, chips generated during cutting can be easily discharged without falling into the pipe. Therefore, by conduit M:! It is also possible to prevent the circulation of chips to each piece of equipment that has been threaded, and it is also easier to maintain and manage steam glands, etc.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional cut state of an existing pipe, and Figure 2 (a
j (bJ - Fig. 4 (JL)) (bJ titIt relates to a specific example of the pipe cutting method of the present invention, and Fig. 2 (a) and (b) are 1
M view of the main pipe cutting process, Figure 3 is a plan view when cutting one pipe installed side by side, and Figures 4 (a) and (b) are plan views when cutting continuous pipes installed side by side. and a picture of a restaurant. In the drawings, 10.20.30 is a tube, 11.21.31 is a first magnet, 12 and 22 are chips, 13 is a second magnet, and 13a is a handle. Patent applicant Mitsubishi Heavy Industries, Ltd. Sub-agent Patent attorney Motoishi Jube” (and 1 others)
Name) Flood I Figure 131

Claims (1)

[Claims] A first magnet for holding chips is arranged around the cut section of a tube made of a magnetic material, and then the tube is cut, while a second magnet is attached to the inside of the cut pipe. A method for cutting a pipe characterized by inserting a pipe and discharging the chips.