JP2008215594A - Pipe member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pie member allowing user to easily identify a removed state of an oxide film and an unremoved state of the same. <P>SOLUTION: A pipe body 11 has an inner layer part 22 including an inner surface 11c of the pipe body 11, and an outer layer part 21 arranged on a surface 22a of the inner layer part and including a surface 11b of the pipe body 11. A thickness dimension of the outer layer part 21 is set in the size of removing the outer layer part 21 together with the oxide film 20 when shaving off the oxide film 20 formed on at least the surface 11b, and identification processing for allowing the user to identify the outer layer part 21 and the inner layer part 22, is applied to at least one of the outer layer part 21 and the inner layer part 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe member made of, for example, polyethylene.

  Conventionally, a pipe member made of a resin that can be melted by heat, such as polyethylene, is known (for example, see Patent Document 1). Such a pipe member is formed by an extrusion molding method for extruding a molten resin material injected into a mold. The surface of the tube member is oxidized by, for example, contact with air after the molten resin material to be the tube member is pushed out of the mold, and thereby an oxide film is formed on the surface of the tube member.

When connecting the pipe members, the ends of the pipe members are inserted into the pipe joint provided with the heating wire, and the pipe joint and the pipe members are fused to each other by the heat of the heating wire. At this time, prior to inserting the end of the pipe member into the pipe joint, the oxide film at the end of the pipe member is scraped off using a dedicated tool, so that the non-oxidized pure polyethylene at the end of the pipe member is obtained. Is previously exposed. This prevents the oxide film from interfering with the fusion between the pipe member and the pipe joint as long as the oxide film is properly removed from the end of the pipe member. It can be fused properly.
JP 2006-132039 A

  However, when an oxide film is formed on the surface of the tube member, for example, the color of the surface of the tube member does not change significantly compared to before the surface of the tube member is oxidized, so the oxide film is deleted from the surface. The appearance of the pipe member that is not exposed and the pipe member from which pure polyethylene is exposed by removing the oxide film from the surface does not differ greatly.

  For this reason, when the operator who connects a pipe member looks at a pipe member, it cannot be judged easily whether the oxide film of the pipe member is deleted, and the pipe member from which the oxide film is not deleted May be mistaken for a pipe member from which the oxide film has been removed.

  Also, when working to remove the oxide film from the surface of the end of the pipe member, even if the oxide film is completely removed from the surface, there is no significant change in appearance, so there is particularly little work experience. When an operator deletes an oxide film, the operator cannot easily determine how much the surface should be cut to completely cut the oxide film from the surface of the pipe member.

  Accordingly, an object of the present invention is to provide a tube member that can easily distinguish between a state in which an oxide film has been deleted and a state in which the oxide film has not been deleted.

  In order to solve the above problems, the invention according to claim 1 includes a tubular tube body, the tube body is provided on an inner layer portion including an inner surface of the tube body, and on a surface of the inner layer portion. An outer layer portion including the surface of the tube body, and the thickness dimension of the outer layer portion is such that the outer layer portion is removed together with the oxide film when at least the oxide film formed on the surface is scraped off. And at least one of the outer layer portion and the inner layer portion is subjected to identification processing for making the outer layer portion and the inner layer portion distinguishable.

  The invention according to claim 2 is the invention according to claim 1, wherein the identification processing is mixing a pigment into at least one of the outer layer portion and the inner layer portion, and the color of the pigment is The outer layer portion and the inner layer portion are different in color from the other color not subjected to the identification processing.

  The invention according to claim 3 is the invention according to claim 2, wherein the pigment is mixed in the outer layer portion and the inner layer portion, respectively, and the pigment mixed in each of the outer layer portion and the inner layer portion. These colors are similar colors, and the color density of the pigment mixed in the inner layer part is lighter than the color density of the pigment mixed in the outer layer part.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the tube main body is inserted into one end portion of a cylindrical electrofusion joint having an end portion having a heating wire. Being fused to the electric fusion joint by the heat of the heating wire, and connected to the other pipe body inserted into the other end of the electric fusion joint via the electric fusion joint, The inner layer portion includes a first layer including the inner surface and a second layer disposed between the first layer and the outer layer portion, and the outer diameter of the first layer is the end of the tube body. The outer diameter of the tube main body is set to be approximately equal to the minimum value that can be taken so that the portion can be fused to the electric fusion joint, and the first layer and At least one of the second layers is subjected to identification processing so that the first layer and the second layer can be identified. It is characterized in that is.

  According to a fifth aspect of the present invention, in the invention of the fourth aspect, the identification processing is to mix a pigment into at least one of the first layer and the second layer, and the color of the pigment Is a color different from the other color of the first layer and the second layer which is not subjected to the identification processing.

  The invention according to claim 6 is the invention according to claim 5, wherein the pigment is mixed in each of the first layer and the second layer, and the color of the pigment is similar to the color of the outer layer portion. The color of the pigment mixed in the second layer is lighter than the color of the outer layer and darker than the color of the pigment mixed in the first layer. It is characterized by.

  According to the first aspect of the present invention, the tubular tube body has a two-layer structure having an outer layer portion including the surface of the tube body and an inner layer portion including the inner surface of the tube body, and the thickness dimension of the outer layer portion. Is set to such a size that the outer layer portion is removed together with the oxide film when at least the oxide film formed on the surface is scraped, and at least one of the outer layer portion and the inner layer portion includes the outer layer portion and the inner layer portion. Identification processing is performed to enable identification.

  From this, for example, when the inner layer portion has been subjected to identification processing, when the oxide film formed on the surface at the end of the tube body is scraped off, the outer layer portion is deleted together with the oxide film. An inner layer portion that has a different form from the outer layer portion appears by being subjected to identification processing at the end portion.

  As a result, the inner layer portion is covered with the outer layer portion without removing the oxide film from the surface of the tube body, and the outer layer portion is removed by removing the oxide film from the surface of the tube body. Thus, the appearance of the end of the tube body changes between the state where the inner layer portion is exposed.

  Therefore, by visually observing whether or not the inner layer portion appears at the end of the tube body, it is easy to distinguish between the tube body from which the oxide film has been removed from the surface and the tube body from which the oxide film has not been removed from the surface. can do.

  Thereby, it is possible to reliably prevent an operator who connects the pipe members from mistakenly replacing the pipe member from which the oxide film has been deleted with the pipe member from which the oxide film has been deleted, as in the related art.

  In addition, when the oxide film is completely scraped from the surface at the end of the tube body, the outer layer portion is removed, so that an inner layer portion that exhibits a different aspect from the outer layer portion appears at the end of the tube body. One can easily confirm that the oxide film has been completely removed from the end of the tube body by visually confirming that the inner layer has appeared at the end of the tube body when the oxide film is scraped off. Can know.

  This makes it easy to determine how much the surface should be scraped to completely remove the oxide film from the surface of the pipe member when the oxide film is removed even when an operator with little work experience is working. can do.

  According to the second aspect of the present invention, the identification processing is to mix the pigment into at least one of the outer layer portion and the inner layer portion, and the color of the pigment is subjected to the identification processing of the outer layer portion and the inner layer portion. The color of the outer layer portion and the color of the inner layer portion are different from each other because the color is different from the other color that is not performed.

  As a result, when the inner layer appears by removing the outer layer when the oxide film is scraped from the surface at the end of the tube body, the color of the end of the tube body is the color before the oxide film is removed. That is, it changes to a color different from the color of the outer layer portion.

  Therefore, the operator can easily determine whether or not the oxide film has been removed from the surface of the tube body by visually checking whether the color of the end portion of the tube body is the color of the inner layer portion. Can do.

  According to the invention described in claim 3, the pigment is mixed in each of the outer layer portion and the inner layer portion, and the color of the pigment mixed in the outer layer portion and the inner layer portion is a similar color, and is mixed in the inner layer portion. The color intensity of the pigment is lighter than the color intensity of the pigment mixed in the outer layer portion.

  For example, the color indicated by the tube body is specified for each tube member according to the purpose of use of the tube member, and when the tube member is formed of a light-transmitting material such as synthetic resin, it is specified for the outer layer portion When a color is applied and the inner layer portion has a color different from the designated color, the inner layer portion color and the outer layer portion color are mixed with each other, so that the color of the tube body changes greatly. In addition, even if the specified layer and the same color are applied to the inner layer portion, if the color is darker than the specified color, the inner layer portion transmits the outer layer portion and the outer layer portion Since it becomes easy to see from the surface, the darkness of the color of the appearance of the tube main body becomes deep.

  Therefore, in any of the above cases, there is a possibility that a color different from the designated color may be mistaken for the tube body.

  On the other hand, according to the present invention, as described above, the color of the pigment mixed in the outer layer portion and the inner layer portion is a similar color, and the darkness of the color of the pigment mixed in the inner layer portion is in the outer layer portion. Since the color density of the mixed pigment is lighter, the inner layer color and the outer layer color are mixed with each other, resulting in a large change in the color of the tube body and the inner layer color changing the outer layer color. It can be reliably suppressed that the light passes through and is seen from the surface of the outer layer portion.

  As a result, when the specified color is applied to the outer layer, a different color from the specified color is applied to the inner tube by applying a color that is similar to the specified color and lighter than the specified color. It can be surely prevented from being mistaken as being.

  According to the invention described in claim 4, the end portion of the tubular tube body is fused to the electric fusion joint by the heat of the heating wire while being inserted into the insertion end portion of the electric fusion joint. The inner layer portion has a two-layer structure having a first layer including an inner surface and a second layer disposed between the first layer and the outer layer portion.

  In addition, the outer diameter of the first layer is substantially equal to the minimum value of the values that the outer diameter at the end of the tube body can take in order to enable the end of the tube body to be fused to the electric fusion joint. Therefore, when the oxide film is scraped from the surface at the end of the tube body, the state where the first layer does not appear at the end of the tube body and the surface of the first layer appear. When the deletion operation is finished in the state, the end of the pipe body and the joint body can be fused.

  On the other hand, if the first layer appears while the second layer is removed together with the outer layer portion and the oxide film, the outer diameter of the first layer is reduced when the first layer continues to be removed. That is, since the outer diameter at the end of the tube body is smaller than the minimum value, when the end of the tube body where the first layer appears is inserted into the electric fusion joint, the surface of the first layer The space between the fusion joint is increased, and the end of the tube body cannot be properly fused to the electric fusion joint.

  Furthermore, since at least one of the first layer and the second layer is subjected to identification processing for enabling identification of the first layer and the second layer, for example, identification processing is performed on the first layer. When the second layer is deleted together with the outer layer portion when the oxide film formed on the surface at the end portion of the tube main body is deleted, the end portion of the tube main body is subjected to identification processing. A first layer appears that is different from the second layer.

  From the above, the state where the oxide film is completely removed from the surface at the end of the tube body and the second layer of the inner layer portion appears, and the state where the second layer is removed and the surface of the first layer is exposed That is, the appearance of the end of the pipe body changes between the state where the end of the pipe body is scraped with the maximum scraping amount of the scraping amount that can be fused to the electric fusion joint. By visually recognizing that the first layer appears at the end of the tube body, it can be easily recognized that the end of the tube body should not be further sharpened.

  Therefore, when the oxide film is deleted from the surface at the end portion of the tube body, it is possible to reliably suppress the operator from excessively shaving the surface at the end portion of the tube body.

  According to the invention described in claim 5, the identification process is to mix a pigment into at least one of the first layer and the second layer, and the color of the pigment is different from that of the first layer and the second layer. Of these, the color of the first layer is different from the color of the second layer because it is different from the other color that is not subjected to identification processing.

  As a result, when the first layer appears by removing the second layer together with the outer layer when the oxide film is scraped from the surface at the end of the tube body, the color of the end of the tube body is changed to the second layer. The color changes to a color different from the previous color.

  Therefore, the operator can easily recognize that the end of the tube body should not be further sharpened by confirming that the color of the end of the tube body has changed to the color of the first layer. it can.

  According to the invention described in claim 6, the pigment is mixed in the first layer and the second layer, the color of the pigment is similar to the color of the outer layer portion, and the pigment mixed in the second layer The color density of the first layer is lighter than the color of the outer layer part and darker than the color of the pigment mixed in the first layer, so that the color of the first layer passes through the second layer and the outer layer part and passes through the outer layer part. The color of the second layer is transmitted through the outer layer portion and is visible through the surface of the outer layer portion, and the colors of the first layer and the second layer are the colors of the outer layer portion, respectively. It can suppress reliably that the color tone of a pipe | tube main body changes by mixing.

  As a result, when the specified color is applied to the outer layer portion, a color that is similar to the specified color, lighter than the outer layer color, and darker than the color of the pigment mixed in the first layer is applied to the second layer. By wearing, it can be surely prevented that a color different from the color specified for the tube body is misidentified.

  The present invention will be described with reference to the illustrated embodiments.

  As shown in FIGS. 1 and 2, the pipe member 10 according to the present invention has a cylindrical pipe body 11.

  The tube body 11 is formed of a resin that can be easily melted by heating, such as polyolefin such as polyethylene and polypropylene. Further, the pipe body 11 is connected to the pipe body 11 of another pipe member 10 by using a conventionally well-known electric fusion joint 12.

  As shown in FIG. 1, the electric fusion joint 12 includes a cylindrical joint body 13. In the illustrated example, the joint main body 13 is made of polyolefin like the pipe main body 11, and has insertion end portions 13 a into which the end portions 11 a of the respective pipe main bodies 11 are inserted at both ends thereof.

  Inside the joint main body 13, heating wires 15 are embedded to fuse the joint main body and the pipe main bodies 11 inserted into the insertion end portions 13 a. The heating wire 15 is made of a metal wire made of, for example, nickel chrome, and is wound in a coil shape along the circumferential direction of the joint body 13.

  At both ends of the heating wire 15, rod-shaped connector pins 16 are provided. Each connector pin 16 is accommodated in a cylindrical socket portion 17 provided on the outer peripheral surface 13b of the joint body 13 so as to protrude outward from the outer peripheral surface.

  As is well known in the art, the heating wire 15 generates heat due to electric power supplied via each connector pin 16.

  In the illustrated example, a pair of indicators 18 are embedded in the joint main body 13 to indicate that the joint main body and the pipe main bodies 11 are properly fused together. Each indicator 18 has a bar shape, and the bottom surface of the recess 19 formed between the socket portions 17 on the outer peripheral surface 13b of the joint body 13 extends from the bottom surface to the inside of each recess 19 outside the joint body 13 in the radial direction. It stretches toward the direction.

  The tube main body 11 of the tube member 10 according to the present invention is formed by a conventionally well-known extrusion method for extruding a molten resin material injected into a mold (not shown). The surface 11b of the tube main body 11 is oxidized by, for example, contact with air after the molten resin material that becomes the tube main body 11 is pushed out of the mold. As shown in FIG. 2, an oxide film 20 is formed.

  When connecting the pipe members 10 to each other using the electric fusion joint 12, prior to inserting the end portions 11 a of the pipe main bodies 11 into the insertion end portions 13 a of the joint main bodies 13, the pipe main bodies 11, the joint main bodies, In order to fuse them together properly, the oxide film 20 formed on the surface 11b of the end portion 11a of each tube body 11 is scraped off using a dedicated tool (not shown).

  Next, in a state where the end portions 11a of the respective pipe main bodies 11 are respectively inserted into the joint main bodies 13, the respective heating wires are heated by supplying electric power to the respective heating wires 15, so that the respective insertion end portions of the joint main bodies 13 are heated. The inner peripheral surface 13c (see FIG. 1) at 13a and the surface 11b at the end 11a of each pipe body 11 are melted, and the joint body 13 and both pipe bodies 11 are integrated.

  At this time, as well known in the art, when the synthetic resin constituting the portion of the joint body 13 where the heating wire 15 is provided is melted by the heat generated by the heating wire 15, the molten resin is expanded by the expansion of the molten synthetic resin. When a pressure necessary for fusing is applied to the surface 11b of each tube main body 11, a pressure equivalent to the pressure acts on each indicator 18 from the molten resin toward the radially outer side of the joint main body 13. As a result, each indicator 18 is pushed out in each recess 19 toward the radially outward direction of the joint body 13 and protrudes outward from the outer peripheral surface 13b of the joint body 13 as shown in FIG. The operator can detect that the joint main body 13 and the pipe main bodies 11 are appropriately fused with each other by visually recognizing that the indicators 18 protrude.

  Then, the joint main body 13 and each pipe main body 11 are mutually joined by solidifying the molten part of the joint main body 13 and each pipe main body 11, respectively. Thereby, each pipe main body 11 is mutually connected via the pipe joint 12, and the mutual connection operation | work of both the pipe main bodies 11 is complete | finished.

  As shown in FIG. 2, the tube body 11 according to the present invention is provided on the inner layer portion 22 including the inner surface 11 c of the tube body and the outer layer portion 21 provided on the surface 22 a of the inner layer portion and including the surface 11 b of the tube body 11. And have. That is, the tube body 11 has a two-layer structure.

  The thickness dimension of the outer layer portion 21 is larger than the thickness dimension of the oxide film, and is set to 0.1 mm in the illustrated example. Moreover, the amount of scraping of the surface 11b of the pipe body 11 by the tool is set to 0.15 to 0.25 mm in the illustrated example. That is, when the surface 11b of the tube main body 11 is scraped off by the above-described scraping amount by the tool, the outer layer portion 21 is removed from the tube main body 11 together with the oxide film 20 formed on the surface 11b of the tube main body 11, that is, the surface 11b of the outer layer portion 21. Removed.

  At least one of the outer layer portion 21 and the inner layer portion 22 is subjected to identification processing so that the outer layer portion 21 and the inner layer portion 22 can be identified.

  The identification processing is to mix a pigment into at least one of the outer layer portion 21 and the inner layer portion 22 in the illustrated example, and the pigment is mixed into the outer layer portion 21 and the inner layer portion 22 in the illustrated example, respectively. Yes.

  The colors of the pigments mixed in each of the outer layer portion 21 and the inner layer portion 22 are different from each other, and are similar colors in the illustrated example. Further, the color density of the pigment mixed in the inner layer part 22 is lighter than the color density of the pigment mixed in the outer layer part 21.

  Generally, the color worn on the tube body 11 is specified for each tube body 11 according to the purpose of use. When the tube body 11 is used as a gas tube, the color is yellow. When it is used as a pipe, it is blue, and when the pipe body 11 is used as a sewer pipe, it is gray.

  When the pipe body 11 is used as, for example, a water supply pipe, a blue pigment is mixed in the outer layer portion 21, and a light blue pigment that is a similar color of blue and lighter than blue is mixed in the inner layer portion 22. Is done.

  When the pipe members 10 are connected to each other using the electric fusion joint, when the oxide film 20 formed on the surface 11b at the end 11a of the pipe body 11 is scraped off, the outer layer portion 21 is removed together with the oxide film 20, Thus, as shown in FIG. 3, the surface 22 a of the inner layer portion 22 having a color different from the color of the outer layer portion 21 appears at the end portion 11 a of the tube body 11.

  At this time, when the pipe body 11 is, for example, a water supply pipe, the color of the end portion 11a of the pipe body 11 changes from the color before the oxide film 20 is removed, that is, the blue color that is the color of the inner layer portion 22.

  Thereby, the state in which the inner layer portion 22 is covered with the outer layer portion 21 without the oxide film 20 being deleted from the surface 11b of the tube main body 11 and the oxide film 20 is deleted from the surface 11b of the tube main body 11. That is, the appearance of the end portion 11a of the tube body 11 changes between the state in which the outer layer portion 21 is deleted and the inner layer portion 22 is exposed.

  Therefore, the worker who performs the connection work of the pipe member 10 visually recognizes whether the color of the end portion 11a of the pipe main body 11 is the color of the inner layer portion 22, thereby removing the oxide film 20 from the surface 11b. The tube body 11 and the tube body 11 from which the oxide film 20 is not removed from the surface 11b can be easily identified.

  Thereby, it is possible to reliably prevent the worker who connects the pipe member 11 from mistakenly mistaking the pipe member 10 from which the oxide film 20 has been deleted with the pipe member 10 from which the oxide film 20 has been deleted. Can do.

  Further, when the oxide film 20 is completely scraped from the surface 11b of the end portion 11a of the tube body 11, the outer layer portion 21 is deleted, so that the inner layer portion 22 having a color different from the color of the outer layer portion is formed. Therefore, when the worker is performing the work of scraping off the oxide film 20, the operator visually recognizes that the inner layer portion 22 has appeared at the end portion 11 a of the tube body 11. It can be easily known that the oxide film 20 has been completely scraped off from the end 11a.

  As a result, even when an operator with little work experience performs the work, when the oxide film 20 is deleted, the extent to which the surface 11b is scraped to completely scrape the oxide film 20 from the surface 11b of the tube main body 11 is sufficient. Can be easily determined.

  Further, as described above, the pigment is mixed in each of the outer layer portion 21 and the inner layer portion 22, and the color of the pigment mixed in the outer layer portion 21 and the inner layer portion 22 is a similar color, and is mixed in the inner layer portion 22. The color intensity of the pigment is lighter than the color intensity of the pigment mixed in the outer layer portion 21.

  As in this embodiment, when the tube body 11 is formed of a light-transmitting material such as a synthetic resin, the outer layer portion 21 has the specified color as described above, and the inner layer portion 22 has the specified color. When the colors are different from each other, the color of the inner layer 22 and the color of the outer layer 21 are mixed with each other, so that the color of the tube body 11 changes greatly.

  Even if the specified color and the same color are applied to the inner layer portion 22, the color of the inner layer portion 22 is transmitted through the outer layer portion 21 when the color is darker than the specified color. Since it becomes easy to see from the surface 11b of the outer layer portion, the darkness of the color of the appearance of the tube main body 11 is increased.

  Therefore, in any of the above cases, there is a possibility that a color different from the designated color may be mistaken for the tube body.

  On the other hand, according to the present invention, as described above, the color of the pigment mixed in the outer layer portion 21 and the inner layer portion 22 is a similar color, and the darkness of the color of the pigment mixed in the inner layer portion 22 is Since the color density of the pigment mixed in the outer layer portion 21 is lighter, the color of the inner layer portion 22 and the color of the outer layer portion 21 are mixed with each other, resulting in a great change in the color of the tube body 11 and the inner layer. It can be reliably suppressed that the color of the portion 22 is seen through the outer layer portion 21 through the outer layer portion 21.

  Thereby, when the color specified for the outer layer portion 21 is applied, the inner layer portion 22 is different from the color specified for the tube body 11 by applying a color similar to the specified color and lighter than the specified color. It can be reliably prevented that the color is misidentified.

  In the present embodiment, an example in which the color density of the pigment mixed in the inner layer portion 22 is set to be lighter than the color density of the pigment mixed in the outer layer portion 21 is shown. Instead, the darkness of the color of the pigment mixed in the inner layer portion 22 can be made higher than the darkness of the color of the pigment mixed in the outer layer portion 21.

  In this case, in order to prevent the color of the inner layer portion 22 from being transmitted through the outer layer portion 21 and being seen through the surface of the outer layer portion 21, the surface of the outer layer portion 21, that is, the surface 11b of the tube main body 11 is colored, for example. It is possible to cover with a non-translucent covering member.

  Further, in the present embodiment, an example in which the color of the pigment mixed in each of the outer layer portion 21 and the inner layer portion 22 is a similar color is shown, but instead, it is mixed in each of the outer layer portion 21 and the inner layer portion 22. The color of the applied pigment can be made different.

  In this case, in order to prevent a change in the color of the tube body 11 due to the color of the inner layer portion 22 and the color of the outer layer portion 21 being mixed with each other, the surface 11b of the tube body 11 is covered with the same covering member as described above. Can be covered.

  Furthermore, in this embodiment, an example in which the pigment is mixed in both the outer layer portion 21 and the inner layer portion 22 is shown, but instead of this, a pigment is mixed in either the outer layer portion 21 or the inner layer portion 22. Can do.

  In this embodiment, as shown in FIG. 4, the inner layer portion 22 is divided into a first layer 23 including the inner surface 11 c of the tube body 11 and a second layer 24 disposed between the first layer and the outer layer portion 21. Can be divided. That is, the inner layer portion 22 can have a two-layer structure.

  In the illustrated example, the diameter of the circle defined by the surface 23 a of the first layer 23, that is, the outer diameter of the first layer 23 is such that the end 11 a of the tube body 11 can be fused to the joint body 13. 11 is set to be approximately equal to the minimum value of the possible outer diameters.

  Therefore, when the oxide film 20 is scraped from the surface 11b at the end 11a of the tube body 11, the state in which the first layer 23 does not appear at the end 11a of the tube body 11 and the surface 23a of the first layer 23 are When the deletion operation is finished in the state where it appears, the end portion 11a of the pipe body 11 and the joint body 13 can be fused.

  On the other hand, when the first layer 23 continues to be scraped despite the appearance of the first layer 23 by deleting the second layer 24 together with the outer layer portion 21 and the oxide film 20, the outer diameter of the first layer 23 is When the end portion 11a of the tube body 11 where the first layer 23 appears is inserted into the joint body 13 because the outer diameter at the end portion 11a of the tube body 11 is smaller than the above-described minimum value. The space between the surface 23a of the first layer 23 and the joint body 13 is increased, and the end portion 11a of the pipe body 11 cannot be properly fused to the joint body 13.

  Further, at least one of the first layer 23 and the second layer 24 is subjected to identification processing for enabling the first layer 23 and the second layer 24 to be identified.

  This identification processing is to mix a pigment into at least one of the first layer 23 and the second layer 24 in the illustrated example, and the pigment is the first layer 23 and the second layer 24 in the illustrated example. Are mixed in each.

  The colors of the pigments mixed in each of the first layer 23 and the second layer 24 are different from each other. In the illustrated example, the colors are similar to each other and are similar to the color of the outer layer portion 21. The color density of the pigment mixed in the second layer 24 is lighter than the color density of the outer layer portion 21 and darker than the color density of the pigment mixed in the first layer 23.

  When the pipe body 11 is used as, for example, a water supply pipe, a blue pigment is mixed in the outer layer portion 21, and, for example, a light blue pigment having a blue similar color and a lighter color than blue is contained in the second layer 24. The first layer 23 is mixed with a pigment having a color similar to blue and lighter than light blue.

  According to the example shown in FIG. 4, when the second layer 24 is deleted together with the outer layer portion 21 when the oxide film 20 formed on the surface 11 b of the end portion 11 a of the tube body 11 is deleted, the end portion 11 a of the tube body 11 is removed. As shown in FIG. 5, the first layer 23 with a color different from that of the second layer 24 appears by performing the identification process.

  Thereby, when the surface 23a of the first layer 23 appears, that is, when the end portion 11a of the pipe body 11 is shaved with the maximum shaving amount among the shaving amounts that can be fused to the joint body 13, the pipe body 11 The color of the end 11a changes to a color different from the color before the second layer 24 is deleted.

  Therefore, the operator confirms that the color of the end portion 11a of the tube main body 11 has changed to the color of the first layer 23, so that if the end portion 11a of the tube main body 11 is further shaved, it will be excessively shaved. Can be easily recognized.

  Thereby, when deleting the oxide film 20 from the surface 11b in the edge part 11a of the pipe | tube main body 11, it can suppress reliably that an operator cuts the edge part 11a of the pipe | tube main body 11 too much.

  Further, as described above, the pigment is mixed in each of the first layer 23 and the second layer 24, the color of the pigment is the same color as the color of the outer layer portion 21, and the pigment mixed in the second layer 24 Is darker than the color of the outer layer portion 21 and darker than the color of the pigment mixed in the first layer 23, the color of the first layer 23 is transmitted through the second layer 24 and the outer layer portion 21. Then, it can be seen through the surface 11b of the tube main body 11, the color of the second layer 24 can be seen through the outer layer portion 21 and through the surface 11b of the tube main body 11, and the first layer 23 and the second layer It can be reliably suppressed that the color of the tube main body 11 changes due to the 24 colors being mixed with the color of the outer layer portion 21.

  As a result, when the designated color is applied to the outer layer portion 21, a color that is similar to the designated color, is lighter than the color of the outer layer portion 21, and darker than the color of the pigment mixed in the first layer 23. By wearing the second layer 24, it can be reliably prevented that the color different from the color designated for the tube body 11 is worn.

  In the example shown in FIGS. 4 and 5, the color depth of the pigment mixed in the second layer 24 of the inner layer portion 22 is lighter than the color depth of the outer layer portion 21 and mixed in the first layer 23. Although an example in which the color density of the pigment is set to be darker than that of the pigment has been shown, instead, the color density of the pigment mixed in the second layer 24 is set to be higher than the color density of the outer layer portion 21. It is darker and lighter than the color of the pigment mixed in the first layer 23, or darker than the color of the outer layer 21 and darker than the color of the pigment mixed in the first layer 23. Can do.

  In this case, the colors of the first layer 23 and the second layer 24 are transmitted through the outer layer portion 21 and can be seen from the surface 11b of the tube body 11, and the color of the second layer 24 is transmitted through the outer layer portion 21. In order to prevent the tube body 11 from seeing through the surface 11b of the tube body 11, the surface of the outer layer portion 21, that is, the surface 11b of the tube body 11 is covered with, for example, the above-described covering member having a non-translucent property with a specified color. be able to.

  In the example shown in FIG. 4 and FIG. 5, the color of the pigment mixed in each of the first layer 23 and the second layer 24 is a similar color to each other and the same color as the color of the outer layer portion 21. Although shown, instead of this, the color of both or any one of the first layer 23 and the second layer 24 is set to a color of a system different from the color of the outer layer portion 21, and the first layer 23, the second layer 24 In addition, the colors of the outer layer portion 21 can be different from each other.

  In this case, in order to prevent the color of the tube body 11 from changing due to the colors of the first layer 23, the second layer 24, and the outer layer portion 21 being mixed, the surface 11b of the tube body 11 is described above. It can be covered with a similar covering member.

  Furthermore, in the example shown in FIGS. 4 and 5, an example in which the pigment is mixed in both the first layer 23 and the second layer 24 is shown, but instead of this, the first layer 23 and the second layer 24 A pigment can be mixed in either one.

  In the example shown in FIGS. 1 to 5, an example in which the tube member 10 has a cylindrical shape is shown, but instead, it has a cross-sectional shape other than a circle such as an ellipse, a rectangle, and a polygon. A pipe member can be applied to the present invention.

It is a longitudinal section showing roughly the state where each pipe member concerning the present invention was connected mutually via an electric fusion joint. It is a transverse cross section showing the pipe member concerning the present invention roughly. It is a perspective view which shows roughly the state which deleted the oxide film and outer layer part which were formed in the surface in the edge part of the pipe member which concerns on this invention, respectively. It is a cross-sectional view which shows schematically the pipe member which concerns on an Example different from FIG. It is a perspective view showing roughly the state where the oxide film, outer layer part, and second layer which were formed on the surface in the end part of the pipe member concerning the present invention were deleted, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe member 11 Pipe main body 12 Electrical fusion joint 15 Heating wire 20 Oxide film 21 Outer layer part 22 Inner layer part 23 1st layer 24 2nd layer

Claims (6)

  A tubular tube body, the tube body having an inner layer portion including an inner surface of the tube body, and an outer layer portion provided on a surface of the inner layer portion and including the surface of the tube body, the outer layer portion The thickness dimension is set to such a size that the outer layer portion is removed together with the oxide film when at least the oxide film formed on the surface is scraped, and at least of the outer layer portion and the inner layer portion. On one side, the tube member is characterized by being subjected to identification processing so that the outer layer portion and the inner layer portion can be identified.   The identification process is to mix a pigment into at least one of the outer layer part and the inner layer part, and the color of the pigment is the other color of the outer layer part and the inner layer part that is not subjected to the identification process. The tube member according to claim 1, wherein the tube member has a different color.   The pigment is mixed in the outer layer portion and the inner layer portion, respectively, and the color of the pigment mixed in each of the outer layer portion and the inner layer portion is a similar color, and the pigment mixed in the inner layer portion The pipe member according to claim 2, wherein the color intensity is lighter than the color intensity of the pigment mixed in the outer layer portion.   The tube main body is inserted into one end portion of a cylindrical electric fusion joint having an end portion having a heating wire, and is fused to the electric fusion joint by heat of the heating wire. Connected to another pipe body inserted into the other end of the joint via the electrofusion joint, and the inner layer portion is disposed between the first layer including the inner surface and the first layer and the outer layer portion. The outer diameter of the first layer is such that the end of the tube body can be fused to the electrofusion joint. Is set to be approximately equal to the minimum value that can be taken, and at least one of the first layer and the second layer can identify the first layer and the second layer The pipe member according to claim 1, wherein an identification process is performed to achieve the above.   The discriminating process is to mix a pigment into at least one of the first layer and the second layer, and the color of the pigment is applied to the discriminating process of the first layer and the second layer. The tube member according to claim 4, wherein the tube member has a color different from the other color that is not used.   The pigment is mixed in the first layer and the second layer, respectively, and the color of the pigment is similar to the color of the outer layer portion, and the color of the pigment mixed in the second layer is dark. The pipe member according to claim 5, wherein the pipe member is thinner than the color density of the outer layer portion and darker than the color density of the pigment mixed in the first layer.

Images