JP3207059U - Pipe fitting - Google Patents

Abstract

To provide a pipe joint capable of suppressing generation of toxic gas and welding defects and improving workability when connecting to a metal pipe. A pipe joint X includes a joint pipe body 1 in which the entire surface of the pipe is covered with a galvanized film M. The joint pipe main body 1 removes the galvanized film M from the pipe outer peripheral surface 1E of the pipe end parts 1a, 1b following the pipe end faces 1A, 1B and the pipe end faces 1A, 1B, and continues to the pipe end parts 1A, 1B. The outer peripheral chamfered portion 3 is formed on the outer peripheral surface 1E of the pipes 1a and 1b. The joint pipe main body 1 has a pipe end outer peripheral surface portion 4 formed by removing the galvanized film M from the pipe outer peripheral surface 1E of the pipe end portions 1a and 1b following the outer peripheral chamfered portion 3. [Selection] Figure 5

Description

  The present invention relates to a pipe joint coated with a galvanized film.

  Generally, metal (for example, carbon steel) pipe joints are known. The pipe joint is coated with a galvanized film to provide corrosion resistance. In order to connect a plurality of metal pipes, the pipe joint is connected to each metal pipe by welding.

When the pipe joint is connected to the metal pipe by welding, the galvanized film is melted by welding heat to generate a toxic gas (zinc gas), and a welding defect due to the penetration of the galvanized film is introduced.
In order to suppress the generation of toxic gas (zinc gas) and eliminate welding defects, at the piping site (construction site), use a grinder such as a grinder to weld the welded part (pipe end) of the pipe joint. ), The galvanized film was removed, and workability deteriorated.

  An object of the present invention is to provide a pipe joint that can suppress generation of toxic gas (zinc gas) and welding defects and improve workability when connecting to a metal pipe.

According to a first aspect of the present invention, there is provided a metal joint pipe body in which a pipe end face, a pipe outer peripheral face and a pipe inner peripheral face are all coated with a zinc plating film, and the pipe end face of the joint pipe main body is a pipe of a metal pipe. In the pipe joint that is connected to the metal pipe by welding to the end face, the joint pipe main body has the galvanized coating from the pipe end face and the pipe outer peripheral surface of the pipe end portion following the pipe end face. A tube formed by removing the galvanized film from the outer peripheral chamfered portion formed on the outer peripheral surface of the tube end portion following the tube end surface while removing the galvanized film from the outer peripheral chamfered portion of the tube end portion following the outer peripheral chamfered portion. And an end outer peripheral surface portion.
In claim 1, the galvanized film from the pipe end surface and the galvanized film from the pipe outer peripheral surface of the pipe end portion following the pipe end surface are removed by cutting (cutting with a machine tool) while being removed. An outer peripheral chamfer is formed on the pipe outer peripheral surface of the pipe end portion following the pipe end surface, and the galvanized film is removed from the pipe outer peripheral surface of the pipe end portion following the outer peripheral chamfered portion by grinding (grinding with a grindstone of a grinding machine). The structure which forms a pipe end outer peripheral surface part is also employable.
In claim 1, the galvanized film is removed from the pipe end surface, and the galvanized film is removed from the pipe outer peripheral surface of the pipe end portion following the pipe end surface to form an outer peripheral chamfered portion on the pipe outer peripheral surface of the pipe end portion following the pipe end surface. It is also possible to adopt a configuration that
Claim 1 is a pipe joint comprising a metal joint pipe body, the pipe end face of the joint pipe body being abutted against the pipe end face of the metal pipe, and the joint pipe body being connected to the metal pipe by welding. The tube main body has an unplated outer peripheral chamfered portion formed on the outer peripheral surface of the tube end portion following the tube end surface, and an unplated tube end formed on the tube outer peripheral surface of the tube end portion subsequent to the outer peripheral chamfered portion. A configuration having an outer peripheral surface portion, a pipe outer peripheral surface excluding the outer peripheral chamfered portion and the pipe end outer peripheral surface portion, and a plating inner peripheral surface portion formed by coating the entire surface of the pipe inner peripheral surface with a zinc plating film can also be adopted.

According to the first aspect of the present invention, the pipe end surface of the joint pipe main body, the pipe end portion following the pipe end surface (the outer peripheral chamfered portion and the pipe end outer peripheral surface portion) are non-plated regions that are not covered with the galvanized film, Even if the pipe end face of the joint pipe body is abutted against the pipe end face of the metal pipe and the joint pipe body is connected to the metal pipe by welding, generation of toxic gas (zinc gas) due to melting of the galvanized film and welding defects can be suppressed. .
According to claim 1 of the present invention, before bringing the pipe joint into the construction site (piping site), a machine tool is used to cut the galvanized film from the pipe end surface and the pipe at the pipe end portion following the pipe end surface. The outer peripheral chamfered portion can be formed on the outer peripheral surface of the tube end portion following the tube end surface while removing the galvanized film from the outer peripheral surface, and the outer periphery of the tube end portion following the outer peripheral chamfered portion by grinding using a grinding machine. Since the galvanized film can be removed from the surface to form the pipe end outer peripheral surface part, it is not necessary to remove the galvanized film at the construction site (piping site), and the workability can be improved.

It is a perspective view which shows a pipe joint (elbow pipe joint). It is a front view which shows a pipe joint (elbow pipe joint). It is a rear view which shows a pipe joint (elbow pipe joint). It is a top view which shows a pipe joint (elbow pipe joint). (A) is a side view showing a pipe joint (elbow pipe joint), (b) is an enlarged view of a main part showing one pipe end of FIG. 5 (a), and (c) is FIG. 5 (a). It is a principal part enlarged view which shows the other pipe end part. It is a bottom view which shows a pipe joint (elbow pipe joint). It is AA sectional drawing of FIG. (A) is a pipe joint (elbow pipe joint), and is a side view showing a joint pipe body in which the entire surface of each pipe end face, pipe outer peripheral face and pipe inner peripheral face is coated with a galvanized film, (b) It is sectional drawing of Fig.8 (a). (A) is a pipe joint (elbow pipe joint), and is a side view showing a joint pipe body in which an outer peripheral chamfered portion (non-plated chamfered portion) is formed, and (b) is a cross-sectional view of FIG. 9 (a). is there. (A) is a pipe joint (elbow pipe joint), and is a side view showing a joint pipe body in which a pipe end outer peripheral surface part (non-plated pipe end outer peripheral surface part) is formed, and (b) is a grinding machine and a joint pipe It is a side view which shows a main body. It is a side view which shows the state which connected the joint pipe main body of the pipe joint (elbow pipe joint) to the metal pipe by welding. (A) is a side view which shows a pipe joint (elbow pipe joint), (b) is sectional drawing of Fig.12 (a). (A) is a side view which shows a pipe joint (reducer pipe joint), (b) is sectional drawing of Fig.13 (a). (A) is a side view which shows a pipe joint (tee pipe joint), (b) is sectional drawing of Fig.14 (a). (A) is a side view which shows a pipe joint (cap), (b) is sectional drawing of Fig.15 (a).

  A pipe joint according to the present invention will be described with reference to FIGS.

1 to 7, the pipe joint X is formed in a cylindrical shape from a metal (for example, carbon steel). The pipe joint X is, for example, an elbow pipe joint (hereinafter referred to as “elbow pipe joint X”).
As shown in FIGS. 1 to 7, the pipe joint X includes a joint pipe body 1 made of metal (for example, carbon steel).

As shown in FIGS. 1 to 7, the joint pipe body 1 is formed in a cylindrical shape. The joint pipe body 1 is formed (mandrel molding) by bending a carbon steel pipe into an arc shape having an angle of 90 degrees, for example.
The joint pipe main body 1 has both non-plated pipe end faces 1A and 1B (non-plated pipe end faces 1A and 1B).
“Non-plating” means that the coating is not covered with the zinc plating film M, that is, the metal surface is exposed (hereinafter the same).

  As shown in FIGS. 1 to 7, the joint pipe main body 1 includes an unplated outer peripheral chamfered portion 3, 3 (non-plated outer peripheral chamfered portion 3, 3), an unplated pipe end outer peripheral surface portion 4, 4 (nonplated tube). The outer peripheral surface portions 4 and 4) and the inner peripheral surface portion 5 are provided.

  The non-plating outer peripheral chamfered portions 3 and 3 (bevel ends) are formed on the tube outer peripheral surface 1E of the tube end portions 1a and 1b following the respective tube end surfaces 1A and 1B. The non-plating outer peripheral chamfered portions 3 and 3 are formed to be inclined from the pipe end surfaces 1A and 1B toward the pipe outer peripheral surface 1E (the pipe outer peripheral surface 1C of the joint pipe main body 1). The non-plating outer peripheral chamfered portions 3 and 3 are inclined with an angle θ = 32.5 degrees with respect to the tube end surfaces 1A and 1B, for example. The non-plating outer peripheral chamfered portions 3 and 3 are formed over the circumferential direction P of the joint pipe body 1.

As shown in FIGS. 1 to 7, the non-plated tube end outer peripheral surface portions 4 and 4 are formed on the tube outer peripheral surface 1E of the tube end portions 1a and 1b following the non-plated outer peripheral chamfered portions 3 and 3, respectively. The non-plated tube end outer peripheral surface portions 4 and 4 are formed along the tube center line a of the joint tube main body 1. The non-plating tube end outer peripheral surface portions 4 and 4 are formed to have a non-plating width h from the non-plating outer peripheral chamfered portions 3 and 3. The non-plating tube end outer peripheral surface portions 4 and 4 are formed with a non-plating width h = 5 to 20 mm, for example.
The non-plated tube end outer peripheral surface portions 4, 4 are formed over the circumferential direction P of the joint tube main body 1.

  As shown in FIGS. 1 to 7, the inner peripheral surface portion 5 of the plating is formed on the entire surface of the outer peripheral surface 1C of the tube except the non-plated outer peripheral chamfered portions 3 and 3 and the outer peripheral surface portions 4 and 4 of the non-plated tube, and the inner peripheral surface 1D. It is formed by coating with a galvanized film M.

Next, manufacture of the pipe joint X is demonstrated with reference to FIG. 8 thru | or FIG.
8 to 10, the same reference numerals as those in FIGS. 1 to 7 denote the same members and the same configurations, and thus detailed description thereof will be omitted.

In FIG. 8, the pipe joint X includes a metal joint pipe main body 1 in which the entire pipe end surfaces 1 </ b> A and 1 </ b> B, the pipe outer peripheral face 1 </ b> C, and the pipe inner peripheral face 1 </ b> D are covered with a galvanized film M.
As shown in FIG. 8, the galvanized film M is obtained by subjecting the joint pipe body 1 to hot dip galvanization (hot dip galvanizing treatment), so that the pipe end faces 1A and 1B, the pipe outer peripheral face 1C, and the pipe inner peripheral face 1D are entirely covered. And covers the entire pipe surface of the joint pipe body 1.

In FIG. 9, the joint pipe main body 1 with the entire surface covered with the galvanized film M has a pipe outer periphery of the pipe end portions 1a and 1b extending from the pipe end faces 1A and 1B to the galvanized film M and the pipe end faces 1A and 1B. While removing the galvanized film M from the surface 1E, the outer peripheral chamfered portions 3 and 3 (non-plated outer peripheral chamfered portions 3 and 3) formed on the outer peripheral surface 1E of the tube end portions 1a and 1b following the respective tube end surfaces 1A and 1B. ).
The outer peripheral chamfered portions 3 and 3 are formed by, for example, cutting the galvanized film M from the tube end surfaces 1A and 1B and the galvanized film M from the tube outer peripheral surface 1E of the tube end portions 1a and 1b following the tube end surfaces 1A and 1B. While removing (while removing), simultaneously with the removal of the galvanized film M, the tube end portions 1a and 1b are formed on the pipe outer circumferential surface 1E.
The outer peripheral chamfered portions 3 and 3 can be cut using a machine tool [a lathe, NC (numerical control) lathe, milling machine, machining center, etc.].

In FIG. 10, the joint pipe body 1 in which the outer peripheral chamfered portions 3 and 3 are formed is formed by removing the galvanized film M from the pipe outer peripheral surface 1E of the pipe end portions 1a and 1b following the outer peripheral chamfered portions 3 and 3. It has tube end outer peripheral surface portions 4, 4 (non-plated tube end outer peripheral surface portions 4, 4).
The tube end outer peripheral surface portions 4 and 4 are formed by removing the galvanized film M from the tube outer peripheral surface 1E of the tube end portions 1a and 1b following the outer peripheral chamfered portions 3 and 3 by grinding, for example.

The pipe end outer peripheral surface portions 4 and 4 (non-plated tube end outer peripheral surface portions 4 and 4) are formed by using a grinding machine Y (grinding apparatus) as shown in FIG.
As shown in FIG. 10B, the grinding machine Y urges the table 102 having the workpiece support protrusion 101, the electric motor 103 that rotates the table 102, the grindstone 104, and the grindstone 104 toward the table 102. A mechanism 105 (biasing device) is provided. The grindstone 104 is formed in a circular plate, and the plate thickness h1 is the same as the non-plating width (h1 = h). The urging mechanism 105 urges the grindstone 104 toward the table 102 with a spring or air (compressed air), for example.

In FIG. 10B, the joint pipe main body 1 in which the outer peripheral chamfered portions 3 and 3 are formed is placed on the table 102 from one pipe end face 1B. At this time, the joint pipe main body 1 is externally fitted to the workpiece support protrusion 101 from one pipe end face 1B, and abuts the pipe end face 1B to the table 102. The workpiece support protrusion 101 is inserted into the joint pipe body 1 from one pipe end face 1B, and an annular ring rubber (not shown) is brought into contact with the pipe inner peripheral face 21D in a press-fit state. Thereby, the workpiece | work support protrusion 101 fixes the joint pipe main body 1 with respect to the table 102 so that rotation is impossible.
When the joint pipe main body 1 is fixed to the table 102, the electric motor 103 is driven to rotate the table 102 (work support projection 101) and the joint pipe main body 1.
When the joint pipe main body 1 is rotated, the grindstone 104 is disposed at a position continuous with the one outer peripheral chamfered portion 3 of the joint pipe main body 1. Subsequently, the grinding stone 104 is pressed against the pipe outer peripheral surface 1E of the pipe end 1b of the joint pipe body 1 by the biasing force (spring force or the like) of the biasing mechanism 105, and the galvanizing of the pipe outer peripheral surface 1E of the pipe end 1b is performed. The film M is removed.
Thereby, in the joint pipe main body 1, the pipe end outer peripheral surface part 4 (non-plated pipe end outer peripheral part 4) is formed on the pipe outer peripheral face 1E of the pipe end part 1b following the one outer peripheral chamfered part 3. A pipe end outer peripheral surface part 4 having a non-plating width h is formed on the pipe end 1b of the joint pipe main body 1 [see FIG. 10 (a)].

In FIG. 10B, when the tube end outer peripheral surface portion 4 is formed in the tube end portion 1b, the grindstone 104 is retracted from the table 102 and the driving of the electric motor 103 is stopped.
Subsequently, the joint pipe main body 1 is pulled out from the work support protrusion 101, and the joint pipe main body 1 is externally fitted (press-fitted) into the work support protrusion 101 from the other pipe end surface 1A. It is fixed so that it cannot rotate.
Similarly to the one pipe end 1b, the galvanized film M is removed from the pipe outer peripheral surface 1E of the pipe end 1a following the other outer peripheral chamfer 3 using the grinding machine Y (grinding stone 104).
Thereby, in the joint pipe main body 1, the pipe end outer peripheral surface part 4 (non-plated pipe end outer peripheral surface part 4) is formed on the pipe outer peripheral surface 1E of the pipe end part 1a following the other outer peripheral chamfered part 3. A pipe end outer peripheral surface portion 4 having a non-plating width h is formed on the pipe end 1a of the joint pipe main body 1 [see FIG. 10 (a)].
Further, the entire surface of the tube outer peripheral surface 1C excluding the outer peripheral chamfered portions 3 and 3 and the tube end outer peripheral surface portions 4 and 4 and the inner peripheral surface 1D of the tube is the inner peripheral surface portion 5 coated with the galvanized film M.

As shown in FIG. 11, the pipe joint X (elbow pipe joint) connects (connects) the joint pipe body 1 to the metal pipe Z by welding.
As shown in FIG. 11, the metal tube Z is, for example, a cylindrical carbon steel tube. Similarly to the pipe joint X (joint pipe main body 1), the metal pipe Z has a non-plated pipe end face 81A, a non-plated outer peripheral chamfer 83, a non-plated pipe end outer peripheral face 84, and a plated inner peripheral face 85. . In the metal tube Z, the inner peripheral surface portion 85 in the plating is formed by covering the outer peripheral surface of the tube excluding the outer peripheral chamfered portion 83 and the outer peripheral surface portion 84 of the tube and the entire inner peripheral surface of the tube with the galvanized film M.

In FIG. 11, a pipe joint X (elbow pipe joint) abuts one pipe end face 1A (non-plated pipe end face 1A) of the joint pipe body 1 to a pipe end face 81A (non-plated pipe end face 81A) of the metal pipe Z.
Thus, a groove portion K is formed between the outer peripheral chamfered portion 3 (non-plated outer peripheral chamfered portion 3) of the joint pipe body 1 and the outer peripheral chamfered portion 83 (non-plated outer peripheral chamfered portion 83) of the metal tube Z.
Subsequently, the joint pipe body 1 is connected (linked) to the metal pipe Z by welding along the groove portion K.
At this time, even if the joint pipe body 1 is connected to the metal pipe Z by welding, the pipe end surface 1A, the outer peripheral chamfered portion 3 and the pipe end outer peripheral surface portion 4 of the pipe joint X (elbow pipe joint) are made of the galvanized film M. Since it is an area | region which is not coat | covered, generation | occurrence | production of the toxic gas (zinc gas / zinc fume) by the fusion | melting of the zinc plating film M and a welding defect can be suppressed.

  In the pipe joint X, the elbow pipe joint has been described. However, the present invention is not limited to this, and various pipe joints may be used as shown in FIGS. 12 to 15, the same reference numerals as those in FIGS. 1 to 11 denote the same members and the same configuration, and thus detailed description thereof is omitted.

In FIG. 12, the pipe joint X is an elbow pipe joint. The pipe joint X includes a joint pipe body 21 made of metal (for example, carbon steel).
The joint pipe body 21 is formed in a cylindrical shape. The joint pipe main body 21 is formed into, for example, an arc shape having an angle of 90 degrees, and gradually increases in diameter from one pipe end face 21A toward the other pipe end face 21B.
1 to 7 (joint pipe main body 1), the joint pipe main body 21 has unplated pipe end faces 21A and 21B, non-plated outer peripheral chamfers 3 and 3, and non-plated pipe end outer periphery. It has the surface parts 4 and 4 and the plating outer peripheral surface part 5. As shown in FIG. 12, the inner peripheral surface portion 5 of the plating is formed by coating the entire surface of the tube outer peripheral surface 21C and the inner peripheral surface 21D with the exception of the non-plating outer peripheral chamfered portions 3, 3 and the non-plated tube end outer peripheral surface portions 4, 4. It is formed by coating with M.

The pipe joint X of FIG. 12 includes a joint pipe body 21 in which the pipe end surfaces 21A and 21B, the pipe outer peripheral surface 21C, and the pipe inner peripheral surface 21D are covered with a galvanized film M in the same manner as described with reference to FIG. .
The joint pipe main body 21 in which the entire surface of the pipe is coated with the galvanized film M is the same as described with reference to FIG. 9, and the pipe end portions 21a and 21b following the galvanized film M and the pipe end faces 21A and 21B from the pipe end faces 21A and 21B. The outer peripheral chamfered portions 3 and 3 are formed on the outer peripheral surface 21E of the tube end portions 21a and 21b following the respective tube end surfaces 21A and 21B while removing the galvanized film M from the outer peripheral surface 21E. The outer peripheral chamfered portions 3 and 3 are formed by cutting (machine tool), for example, as described with reference to FIG.
The joint pipe main body 21 is formed by removing the galvanized film M from the pipe outer peripheral surface 21E of the pipe end portions 21a and 21b following the outer peripheral chamfered portions 3 and 3 as described in FIG. 4,4. The pipe end outer peripheral surface parts 4 and 4 have a non-plating width h along the pipe center line a of the joint pipe main body 21, and are formed by, for example, grinding (grinding machine Y) as described with reference to FIG. .
12, the pipe end surface 21A of the joint pipe main body 21 is abutted against the pipe end surface 51A of the metal pipe Z, and the joint pipe main body 21 is connected to the metal pipe Z by welding (as described in FIG. 11). Link.

In FIG. 13, a pipe joint X is a reducer pipe joint. The pipe joint X includes a joint pipe body 31 made of metal (for example, carbon steel).
The joint pipe body 31 is formed in a cylindrical shape. As shown in FIG. 13, the joint pipe main body 31 gradually decreases in diameter from one pipe end face 31 </ b> A toward the other pipe end face 31 </ b> B.
1 to 7 (joint pipe main body 1), the joint pipe main body 31 has non-plated pipe end faces 31A and 31B, non-plated outer peripheral chamfers 3 and 3, and non-plated pipe end outer periphery. It has the surface parts 4 and 4 and the plating outer peripheral surface part 5. As shown in FIG. 13, the inner peripheral surface portion 5 of the plating is formed by coating the entire surface of the outer peripheral surface 31C and the inner peripheral surface 31D of the tube except the non-plated outer peripheral chamfered portions 3 and 3 and the non-plated tube end outer peripheral surface portions 4 and 4 with a zinc plating film. It is formed by coating with M.

The pipe joint X of FIG. 13 includes a joint pipe body 31 in which the pipe end surfaces 31A and 31B, the pipe outer peripheral face 31C, and the pipe inner peripheral face 31D are covered with a galvanized film M in the same manner as described with reference to FIG. .
In the same manner as described with reference to FIG. 9, the joint pipe body 31 in which the entire surface of the pipe is covered with the galvanized film M is provided with the pipe end portions 31a and 31b extending from the pipe end surfaces 31A and 31B to the galvanized film M and the pipe end surfaces 31A and 31B. The outer peripheral chamfered portions 3 and 3 are formed on the outer peripheral surface 31E of the tube end portions 31a and 31b following the respective tube end surfaces 31A and 31B while removing the galvanized film M from the outer peripheral surface 31E. The outer peripheral chamfered portions 3 and 3 are formed by cutting (machine tool), for example, as described with reference to FIG.
The joint pipe main body 31 is a pipe end outer peripheral surface portion formed by removing the galvanized film M from the pipe outer peripheral surface 31E of the pipe end portions 31a and 31b following the outer peripheral chamfered portions 3 and 3 as described in FIG. 4,4. The pipe end outer peripheral surface parts 4 and 4 have a non-plating width h along the pipe center line a of the joint pipe main body 31, and are formed by, for example, grinding (grinding machine Y) as described with reference to FIG. .
13, the pipe end surface 31A of the joint pipe main body 31 is abutted against the pipe end surface 81A of the metal pipe Z, and the joint pipe main body 31 is connected to the metal pipe Z by welding (as described in FIG. 11). Link.

In FIG. 14, the pipe joint X is a tee pipe joint. As shown in FIG. 14, the pipe joint X includes a joint pipe body 41 made of metal (for example, carbon steel).
The joint pipe body 41 includes a cylindrical horizontal pipe 45 and a cylindrical vertical pipe 46, and the horizontal pipe 45 and the vertical pipe 46 are integrally formed orthogonally. The vertical tube 46 communicates with one tube end opened into the horizontal tube 45.
1 to 7, the joint pipe main body 41 includes unplated pipe end faces 41A, 41B, 41C, non-plated outer peripheral chamfered portions 3, 3, 3, and non-plated pipe end outer peripheral face portions 4. , 4, 4, and inner peripheral surface portion 5 within the plating. The outer peripheral surface portion 5 of the plating is coated with the galvanized film M on the entire surface of the pipe outer peripheral surface 41D and the inner peripheral surface 41E except for the non-plating outer peripheral chamfered portions 3, 3, 3 and the non-plated tube end outer peripheral surface portions 4, 4, 4. Formed.

The pipe joint X of FIG. 14 is similar to that described with reference to FIG. 8. The pipe end faces 41A and 41B of the horizontal pipe 45, the pipe end face 41C of the vertical pipe 46, the pipe outer peripheral face 41D, and the pipe inner peripheral faces of the pipes 45 and 46 are used. A joint pipe body 41 in which the entire surface of the pipe 41E is coated with a galvanized film M is provided.
In the same manner as described with reference to FIG. 9, the joint pipe body 41 covering the entire surface of the pipe with the galvanized film M is a pipe continuing from the pipe end faces 41A, 41B, 41C to the galvanized film M and the pipe end faces 41A, 41B, 41C. While removing the galvanized film M from the pipe outer peripheral surface 41F of the end portions 41a, 41b, 41c, the outer periphery formed on the pipe outer peripheral surface 41F of the pipe end portions 41a, 41b, 41c following the pipe end surfaces 41A, 41B, 41C. It has chamfered portions 3, 3, and 3. The outer peripheral chamfered portions 3, 3, and 3 are formed by cutting (machine tool), for example, as described with reference to FIG.
The joint pipe main body 41 is formed by removing the galvanized film M from the pipe outer peripheral surface 41F of the pipe end portions 41a, 41b, 41c following the outer peripheral chamfered portions 3, 3, 3 as described in FIG. It has tube end outer peripheral surface portions 4, 4, and 4. The pipe end outer peripheral surface portions 4, 4, 4 have a non-plating width h along the pipe center line a of the pipes 45, 46 of the joint pipe main body 41, and, for example, grinding ( Formed by grinding machine Y).
14, the pipe end surface 41A of the joint pipe main body 41 is abutted against the pipe end surface 81A of the metal pipe Z, and the joint pipe main body 41 is connected to the metal pipe Z by welding (as described in FIG. 11). Link.

In FIG. 15, the pipe joint X is a cap. As shown in FIG. 15, the pipe joint X includes a joint pipe body 51 made of metal (for example, carbon steel).
The joint pipe body 51 is formed in a hemispherical shape with one end opening and the other end closed. 1 to 7 (joint pipe main body 1), the joint pipe main body 51 has an unplated pipe end face 51A, an unplated outer peripheral chamfered part 3, an unplated pipe end outer peripheral face part 4, and a plating. It has an inner and outer peripheral surface portion 5. As shown in FIG. 15, the inner peripheral surface portion 5 of the plating is coated with the zinc plating film M on the entire surface of the outer peripheral surface 51C of the tube except the outer peripheral chamfered portion 3 and the outer peripheral surface portion 4 of the non-plated tube, and the inner peripheral surface 51D of the tube. Formed.

The pipe joint X of FIG. 15 includes a joint pipe main body 51 in which the pipe entire surface of the pipe end surface 51A, the pipe outer peripheral surface 51C, and the pipe inner peripheral surface 51D is covered with a galvanized film M, as described with reference to FIG.
In the same manner as described with reference to FIG. 9, the joint pipe body 51 covering the entire surface of the pipe with the galvanized film M is from the pipe end face 51A to the galvanized film M and from the pipe outer peripheral surface 51E of the pipe end 51a following the pipe end face 51A. While removing the galvanized film M, the outer peripheral chamfered portion 3 is formed on the outer peripheral surface 51E of the tube end 51a following the end surface 51A. The outer peripheral chamfered portion 3 is formed by cutting (machine tool), for example, as described with reference to FIG.
The joint pipe main body 51 has the pipe end outer peripheral surface part 4 formed by removing the galvanized film M from the pipe outer peripheral surface 51E of the pipe end part 51a following the outer peripheral chamfered part 3 as described in FIG. The pipe end outer peripheral surface portion 4 has a non-plating width h along the pipe center line a of the joint pipe main body 51, and is formed by grinding in the same manner as described with reference to FIG.
In the pipe joint X of FIG. 15, the pipe end surface 51A of the joint pipe main body 51 is abutted against the pipe end surface 81A of the metal pipe Z, and the joint pipe main body 51 is connected to the metal pipe Z by welding in the same manner as described with reference to FIG. Link.

  In addition to the pipe joints described in FIG. 1 to FIG. It may be a pipe joint, a straight pipe flap joint pipe joint made of carbon steel, or the like.

  The present invention is most suitable for a pipe joint for connecting metal pipes.

X Pipe joint Z Metal pipe M Zinc plating film 1 Joint pipe main body 1a, 1b Pipe end 1A, 1B Pipe end face 1C Pipe outer peripheral face 1D Pipe inner peripheral face 1E Pipe outer peripheral face 3E Pipe outer peripheral face 3 Chamfer)
4 Tube end outer peripheral surface (non-plated tube end outer peripheral surface)
5 Plating inner peripheral surface 81A Pipe end face (metal pipe)

Claims (1)

A joint pipe body made of metal in which a pipe end face, a pipe outer peripheral face, and a pipe inner peripheral face are all coated with a zinc plating film is provided, and the pipe end face of the joint pipe body is abutted against the pipe end face of the metal pipe. In a pipe joint connecting the metal pipe to the metal pipe by welding,
The joint pipe body is
An outer peripheral chamfered portion formed on the outer peripheral surface of the tube end portion following the tube end surface while removing the galvanized film from the outer peripheral surface of the tube end portion following the tube end surface and the tube end surface;
A tube end outer peripheral surface portion formed by removing the galvanized film from the tube outer peripheral surface of the tube end portion following the outer peripheral chamfered portion;
A pipe joint characterized by comprising:

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