Dismantling method for tubular members

Abstract

This prevents environmental contamination by hazardous substances that may be generated when dismantling tubular components that have hazardous substances attached to their interiors. [Solution] A tubular member to which harmful substances are attached to the inside is filled with foamed urethane over a first predetermined range, including a first predetermined location, and a tubular member to which foamed urethane is filled over a second predetermined range, including a second predetermined location different from the first predetermined location. Then, the tubular member is cut at the first predetermined location and the second predetermined location.

Description

Technical Field

[0007]

[0001] The present invention relates to a method for disassembling a tubular member, and more particularly to a method for disassembling a tubular member having harmful substances attached to the inside thereof.

Background Art

[0002] Conventionally, as this type of technology, there has been proposed a method of forming a coating film having a laminated structure of two or more layers on the surface of PCB contaminants (see, for example, Patent Document 1). In this treatment method, the first layer in contact with the PCB contaminants is formed by a coating method in which a coating member is brought into contact with the surface of the contaminants.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described treatment method, when harmful substances are attached to the inside of a duct or a pipe material, it may be difficult to paint the inside of the duct or the inside of the pipe material. If the duct or the pipe material is appropriately cut and disassembled, contamination of the environment and the like by the harmful substances will occur.

[0005] The main object of the method for disassembling a tubular member of the present invention is to prevent contamination of the environment and the like by harmful substances that may occur when disassembling a tubular member having harmful substances attached to the inside thereof.

Means for Solving the Problems

[0006] The method for disassembling a tubular member of the present invention has taken the following means in order to achieve the above main object.

[0007] The method for disassembling a tubular member of the present invention is A method for dismantling a tubular member to which harmful substances have adhered on the inside, A first filling step involves filling the inside of the tubular member, including a first predetermined location, with foamed urethane over a first predetermined range, A second filling step involves filling the inside of the tubular member with foamed urethane over a second predetermined range, including a second predetermined location different from the first predetermined location. A cutting step of cutting the tubular member at the first predetermined location and the second predetermined location, It is characterized by having the following features.

[0008] In the dismantling method for tubular members of the present invention, foamed urethane is filled inside the tubular member over a first predetermined range, including a first predetermined location, and also inside the tubular member over a second predetermined range, including a second predetermined location different from the first predetermined location. Then, the tubular member is cut at the first and second predetermined locations. Since both ends of the cut portion of the tubular member cut from the first predetermined location to the second predetermined location are plugged with foamed urethane, contamination of the environment by harmful substances adhering to the inside of the cut portion can be prevented. Furthermore, since the ends of the tubular member after the cut portion has been removed (the first and second predetermined locations) are plugged with foamed urethane, contamination of the environment by harmful substances adhering to the inside of the tubular member after the cut portion has been removed can also be prevented. As a result, it is possible to prevent contamination of the environment by harmful substances that may occur when dismantling a tubular member to which harmful substances have adhered to the inside. Here, tubular members include not only metal or resin pipes but also ducts with circular or rectangular cross-sections. Furthermore, foamed urethane can be formed by mixing a first liquid mainly composed of polyol components and a second liquid mainly composed of isocyanate components.

[0009] In the dismantling method for a tubular member of the present invention, the first filling step may be a step of inserting a spherical first urethane stopper from the open end to the second predetermined location side of the first predetermined range, and then filling the first predetermined range with foamed urethane. In this way, the end on the second predetermined location side of the first predetermined range can be identified, and the filling with foamed urethane can be carried out efficiently.

[0010] In the dismantling method for a tubular member of the present invention, the second filling step may be a step of forming an opening hole from the outside near the second predetermined location of the tubular member, inserting a spherical second urethane stopper from the opening hole into the second predetermined range on the first predetermined location side, and then filling the second predetermined range with foamed urethane. In this case, the method includes a third filling step of filling foamed urethane inward over a third predetermined range, including the third predetermined location on the opposite side of the first predetermined location from the second predetermined location of the tubular member, and a second cutting step of cutting the tubular member at the third predetermined location. The second filling step may be a step of inserting a spherical second urethane stopper from the opening hole into the first predetermined location side of the second predetermined range and inserting a spherical third urethane stopper on the opposite side of the second predetermined range from the first predetermined location side, and then filling the second predetermined range with foamed urethane. In this way, the tubular member can be continuously cut and dismantled. [Brief explanation of the drawing]

[0011] [Figure 1] This is a process diagram showing an example of a dismantling method for a tubular member as one embodiment of the present invention. [Figure 2] This is an explanatory diagram showing the first half of an example of a dismantling method for a tubular member according to an embodiment. [Figure 3] This is an explanatory diagram showing the latter half of an example of a dismantling method for a tubular member according to an embodiment. [Modes for carrying out the invention]

[0012] Next, embodiments for carrying out the present invention will be described. Figure 1 is a process diagram showing an example of a dismantling method for a tubular member as one embodiment of the present invention. Figure 2 is an explanatory diagram showing the first half of the example of the dismantling method for a tubular member of the embodiment, and Figure 3 is an explanatory diagram showing the second half of the example of the dismantling method for a tubular member of the embodiment.

[0013] The dismantling method for the tubular member in this embodiment involves first installing a first stopper 32 at the back of the first cutting location 30 (left side in Figure 2(a)) from the open end of the tubular member 20 (step S100). The tubular member 20 includes not only metal or resin pipes but also ducts with circular or rectangular cross-sections. In this embodiment, the tubular member 20 is described as a duct with a circular cross-section. The first stopper 32 is preferably made of a material such as silicone rubber that can be inflated like a balloon. In this case, even if the cross-section of the tubular member 20 is rectangular, the inside of the tubular member 20 can be sealed.

[0014] Next, foamed urethane 34 is filled from the open end, including the first stopper 32 and the first cutting point 30 (step S110, Figure 2(b)). The foamed urethane 34 can be filled by injecting a liquid mixture of a first liquid mainly composed of polyol components and a second liquid mainly composed of isocyanate components and allowing it to foam. In the case of rigid foamed urethane, the foamed urethane 34 expands to approximately 30 times its original volume immediately after mixing the first and second liquids. Therefore, in this embodiment, the mixed liquid of the first and second liquids is injected near the first stopper 32 in an amount equivalent to about 2 / 30 of the volume from the first stopper 32 to the first cutting point 30.

[0015] Next, an opening 41 is formed at the second cutout location 40 (step S120, Figure 2(c)), and the second stopper 42a is installed on the side of the opening 41 toward the first stopper 32, while the second stopper 42b is installed on the opposite side from the first stopper 32 (step S130, Figure 2(d)). In this embodiment, the second stoppers 42a and 42b are the same as the first stopper 32, but if the cross-sectional shape of the second cutout location 40 of the tubular member 20 is different from that of the first cutout location 30, then second stoppers 42a and 42b with shapes corresponding to the cross-sectional shape of the second cutout location 40 should be used.

[0016] Then, foamed urethane 44 is filled between the second stoppers 42a and 42b of the second cutting point 40 from the opening 41 (step S140, Figure 2(e)). In this case, the amount of the mixed liquid of the first liquid and the second liquid that is injected should be about 1 / 30 of the volume from the second stopper 42a to the second stopper 42b.

[0017] When foamed urethane 44 is filled into the second cutting point 40, the tubular member 20 is cut at the first cutting point 30 and the second cutting point 40 (step S150, Figure 3(f)), and the cut-out member from the first cutting point 30 to the second cutting point 40 is removed. Since both ends of the cut-out member from the first cutting point 30 to the second cutting point 40 are sealed with foamed urethane 34, 44, no contamination of the environment will occur due to harmful substances adhering to the inside of the cut-out member. Also, since the end of the first cutting point 30 on the tubular member 20 side (right end of Figure 3(f)) is sealed with foamed urethane 34, no contamination of the environment will occur due to harmful substances adhering to the inside of the tubular member 20.

[0018] Next, an opening 51 is formed at the third cut-out portion 50 (step S160, FIG. 3(g)), and a third stopper 52a is installed from the opening 51 toward the second stopper 42b side, and a third stopper 52b is installed on the side opposite to the second stopper 42b (step S170, FIG. 2(h)). The third stoppers 52a and 52b may be the same as the first stopper 32 and the second stoppers 42a and 42b. However, when the cross-sectional shape of the third cut-out portion 50 of the tubular member 20 is different from that of the first cut-out portion 30 and the second cut-out portion 40, third stoppers 52a and 52b having a shape corresponding to the cross-sectional shape of the third cut-out portion 50 may be used.

[0019] Subsequently, urethane foam 54 is filled between the third stoppers 52a and 52b at the third cut-out portion 50 from the opening 51 (step S180, FIG. 2(i)). In this case, the mixed liquid of the first liquid and the second liquid may be injected in an amount of about 1 / 30 of the volume from the third stopper 52a to the third stopper 52b.

[0020] Then, the tubular member 20 is cut at the third cut-out portion 50 (step S190), and the cut-out member from the second cut-out portion 40 to the third cut-out portion 50 is removed. Since both ends of the cut-out member from the second cut-out portion 40 to the third cut-out portion 50 are sealed with urethane foams 44 and 54, contamination of the environment or the like does not occur due to harmful substances adhering to the inside of this cut-out member.

[0021] When the cut-out member from the second cut-out portion 40 to the third cut-out portion 50 is removed, the third cut-out portion 50 is recognized as the second cut-out portion 40 (step S200), and steps S160 to S210 are repeated until the disassembling process of the tubular member 20 is completed (step S210). That is, the third cut-out portion 50 is regarded as the second cut-out portion 40, the third cut-out portion 50 is set in the left direction of the tubular member 20 in FIGS. 3(g) to (i), and similarly, the opening of the opening 51, the installation of the third stoppers 52a and 52b, the filling of the urethane foam 54, the cutting of the third cut-out portion 50, and the removal of the cut-out member are repeated. Then, when the disassembling process is completed, this process is terminated.

[0022] In the method for disassembling the tubular member of the embodiment described above, a first stopper 32 is installed on the back side of the first cut-out portion 30 from the open end of the end portion of the tubular member 20, and urethane foam 34 is filled so as to include the first cut-out portion 30 from the open end to the first stopper 32. Subsequently, an opening 41 is formed in the second cut-out portion 40, a second stopper 42a is installed from the opening 41 toward the first stopper 32 side, and a second stopper 42b is installed on the side opposite to the first stopper 32, and urethane foam 44 is filled between the second stoppers 42a and 42b of the second cut-out portion 40 from the opening 41. Then, the tubular member 20 is cut at the first cut-out portion 30 and the second cut-out portion 40, and the cut-out member from the first cut-out portion 30 to the second cut-out portion 40 is removed. Since both ends of the cut-out member from the first cut-out portion 30 to the second cut-out portion 40 are sealed with urethane foams 34 and 44, contamination of the environment or the like by harmful substances adhering to the inside of the cut-out member does not occur. Further, since the end portion on the tubular member 20 side of the first cut-out portion 30 is also sealed with urethane foam 34, contamination of the environment or the like by harmful substances adhering to the inside of the tubular member 20 does not occur. As a result, it is possible to prevent contamination of the environment or the like by harmful substances that may occur when disassembling a tubular member having harmful substances adhering to the inside.

[0023] Further, an opening 51 is formed in the third cut-out portion 50, a third stopper 52a is installed from the opening 51 toward the second stopper 42b side, and a third stopper 52b is installed on the side opposite to the second stopper 42b, and urethane foam 54 is filled between the third stoppers 52a and 52b of the third cut-out portion 50 from the opening 51, the tubular member 20 is cut at the third cut-out portion 50, and the cut-out member from the second cut-out portion 40 to the third cut-out portion 50 is removed. The third cut-out portion 50 is made the second cut-out portion 40, a new third cut-out portion 50 is set, and similarly, the opening of the opening 51, the installation of the third stoppers 52a and 52b, the filling of the urethane foam 54, the cutting of the third cut-out portion 50, and the removal of the cut-out member are repeated. Thereby, the tubular member 20 can be disassembled and removed while continuously preventing contamination of the environment or the like by harmful substances.

[0024] The correspondence between the main elements of the embodiment and the main elements of the invention described in the section on means for solving the problem will be explained. In the embodiment, the tubular member 20 corresponds to the "tubular member", the first cutting location 30 corresponds to the "first predetermined location", and the second cutting location 40 corresponds to the "second predetermined location". Steps S100 to S110 correspond to the "first filling step", steps S120 to S140 correspond to the "second filling step", and step S150 corresponds to the "cutting step".

[0025] Furthermore, the correspondence between the main elements of the embodiment and the main elements of the invention described in the section on means for solving the problem is merely an example to specifically explain the form in which the embodiment implements the invention described in the section on means for solving the problem, and does not limit the elements of the invention described in the section on means for solving the problem. In other words, the interpretation of the invention described in the section on means for solving the problem should be based on the description in that section, and the embodiment is merely one specific example of the invention described in the section on means for solving the problem.

[0026] Although the present invention has been described above using embodiments, the present invention is not limited in any way to these embodiments, and can of course be implemented in various forms without departing from the spirit of the invention. [Industrial applicability]

[0027] This invention can be used in the dismantling industry of tubular members. [Explanation of Symbols]

[0028] 20 Tubular member, 30 First cutout point, 32 First stopper, 34, 44, 54 Foamed urethane, 40 Second cutout point, 41, 51 Opening, 42a, 42b Second stopper, 50 Third cutout point, 52a, 52b Third stopper.

Claims

1. A method for dismantling a tubular member to which harmful substances have adhered on the inside, A first filling step involves filling the inside of the tubular member, including a first predetermined location, with foamed urethane over a first predetermined range, A second filling step involves filling the inside of the tubular member with foamed urethane over a second predetermined range, including a second predetermined location different from the first predetermined location. A cutting step of cutting the tubular member at the first predetermined location and the second predetermined location, A method for dismantling a tubular member, characterized by having the following:

2. A method for dismantling a tubular member according to claim 1, The first filling step involves inserting a first urethane stopper from the opening end towards the second predetermined location within the first predetermined range, and then filling the first predetermined range with foamed urethane. A method for dismantling tubular members.

3. A method for dismantling a tubular member according to claim 2, The second filling step involves forming an opening hole from the outside near the second predetermined location of the tubular member, inserting a second urethane stopper into the second predetermined range on the first predetermined location side through the opening hole, and then filling the second predetermined range with foamed urethane. A method for dismantling tubular members.

4. A method for dismantling a tubular member according to claim 3, A third filling step in which foamed urethane is filled inside the tubular member over a third predetermined range, including from the second predetermined location to the third predetermined location on the opposite side of the first predetermined location, The process includes a second cutting step of cutting the tubular member at the third predetermined location, The second filling step involves inserting a second urethane stopper into the opening on the side of the second predetermined range towards the first predetermined location, and inserting a third urethane stopper on the side of the second predetermined range away from the first predetermined location, and then filling the second predetermined range with foamed urethane. A method for dismantling tubular members.

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