JP2005299897A - Pipe with branch and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe with branch where diameters of a main pipe and a branch pipe are same as each other and its manufacturing method capable of easily and inexpensively manufacturing the pipe with branch. <P>SOLUTION: A heated metal mold for diameter expansion 18 is press-fitted to the branch pipe 14 from an outer side of the branch pipe 14 by using the pipe with branch 10 having the branch pipe 14 of a diameter smaller than that of the main pipe 12, and the diameter is expanded until the diameter of the branch pipe 14 is agreed with the diameter of the main pipe 12. As the main pipe 12 at the circumference of a base part 14a of the branch pipe 14, sags by press-fitting, a sag part 26 is pushed up from an inner side to an outer side of the main pipe 12 by using a sag shaping jig 28. Then a branch pipe connection part is mounted on the diameter-expanded branch pipe 14. As the diameter is expanded by inserting the diameter-expansion metal mold 18 into the branch pipe 14 from the outer side of the branch pipe 14 by using the pipe with branch 10, the pipe with branch 10 having the branch pipe 14 of the diameter same as that of the main pipe 12 can be easily and inexpensively manufactured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a branch pipe and a method for manufacturing the same, and more particularly to a branch pipe and a method for manufacturing the same that are applied to sewers and have a branch pipe diameter equal to or greater than the main pipe diameter.

  One method of manufacturing a branch pipe is a method of inserting a push-up mold from the inside of the pipe and pushing the mold outward to open a branch pipe in the pipe wall and expand the diameter thereof.

  Another method is blow molding. In this method, when a branch pipe is arranged in a mold that covers the entire branch pipe, compressed air is blown into the mold and the branch pipe is expanded, the branch pipe is in close contact with the mold wall surface.

Furthermore, an example of a conventional branch pipe is disclosed in Patent Document 1. In the pipe joint of this patent document 1, the opening of the saddle part is formed into a semicircular oblong shape with both ends long in the main pipe axis direction and short in the main pipe axis orthogonal direction, and the area is equal to the cross-sectional area of the branch pipe. By making it larger, the diameter of the branch pipe is made equal to or larger than the diameter of the main pipe.
JP 2001-188791 A [F16L 41/08, 41/02]

  However, in the push-up process, if the diameter of the branch pipe is made equal to or larger than the diameter of the main pipe, the push-up mold becomes large, and this mold cannot be arranged in the main pipe.

  In blow processing, the diameter of the branch pipe of the branch pipe can be made the same as the diameter of the main pipe, but the die that covers the entire branch pipe is large and requires strength that can withstand compressed air. Molds are expensive and costly.

  In the prior art of Patent Document 1, even if the area of the opening of the saddle portion is equal to or larger than the cross-sectional area of the branch pipe, the main pipe axis orthogonal direction of the opening connecting the branch pipe and the main pipe The diameter of the main pipe and the branch pipe is smaller than the diameter of the main pipe and the branch pipe, so the diameter between the branch pipe and the main pipe is reduced, and inflow foreign matter is clogged here, and inspection tools such as mirrors and cleaning tools cannot be inserted. In the end, there is no point in making the branch pipe and main pipe the same diameter because it is difficult to maintain.

  In addition, it is necessary to open both-end semicircular oblong holes in the main pipe at the site, and the workability of on-site processing is very poor.

  Therefore, a main object of the present invention is to provide a branch pipe having the same diameter of the main pipe and the branch pipe, and a manufacturing method thereof, which can be manufactured easily and at low cost.

  In the invention of claim 1, (a) a branch pipe having a main pipe diameter larger than the branch pipe diameter is prepared as an original pipe, (b) the branch pipe is heated and expanded, and (c) the main pipe at the base of the branch pipe is prepared. This is a branch pipe manufacturing method in which the deforming portion is pushed out from the inside of the main pipe to the outside, and (d) the branch pipe connecting portion is attached to the branch pipe.

  In the first aspect of the present invention, a branch pipe having a main pipe diameter larger than the branch pipe diameter is prepared, and the diameter of the branch pipe is increased by press-fitting a heated diameter-expansion mold into the branch pipe. Thereby, the circumference of the base of the branch pipe in the main pipe falls and deforms inside the main pipe, and the effective cross-sectional area of the main pipe at this position is reduced. For this reason, using the shaping jig arranged in the main pipe, the deformed portion of the main pipe at the base of the branch pipe is pushed out from the inside of the main pipe to the outside so as not to reduce the effective cross-sectional area of the main pipe. And a branch pipe connection part is attached in the branch pipe which became the same diameter as the main pipe.

  Thus, the mold for expanding the diameter of the branch pipe is smaller than the mold for blow molding in a size that fits in the branch pipe, and the mold is not required to have high strength because the diameter of the branch pipe is heated and expanded by this mold. The diameter expansion mold is less expensive than the blow molding mold. By using this inexpensive mold, the manufacturing cost of the branch pipe can be kept low.

  In this method, the branch pipe can be manufactured mainly by heating and expanding the branch pipe and shaping the deformed portion of the main pipe, and does not require complicated processing and large-scale equipment.

  The invention according to claim 2 is a branch pipe in which a branch pipe connecting portion is attached to a branch pipe. The branch pipe is heated and expanded using a branch pipe having a main pipe diameter larger than that of the branch pipe as an original pipe, and the branch pipe is heated and expanded. The branch pipe is characterized in that a deformed portion generated in the branch pipe portion when the diameter is pushed out from the inside of the main pipe.

  If the diameter of the branch pipe of the branch pipe and the diameter of the connecting portion between the branch pipe and the main pipe are the same as the diameter of the main pipe, maintenance of the main pipe and the branch pipe can be facilitated.

  According to the present invention, a branch pipe having a branch pipe having the same diameter as the main pipe can be manufactured easily and inexpensively by heating and expanding the branch pipe and shaping the deformed portion of the main pipe.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  A branch pipe 10 shown in FIG. 1 is a ribbed hard polyvinyl chloride branch pipe having a branch pipe 14 having a smaller diameter than that of the main pipe 12 connected to the side wall of the main pipe 12 and having both ends serving as enlarged diameter receiving ports. Prepare as. The main pipe 12 is not deformed or cracked when the diameter of the branch pipe 14 is increased by inserting metal support pipes 16 having the same diameter as the diameter-expanding receptacles of the main pipe 12 from both ends of the main pipe 12. The main pipe 12 is protected as follows.

  Next, the diameter expansion die 18 shown in FIG. 2 is inserted into the branch pipe 14 to increase the diameter of the branch pipe 14. The diameter-expansion mold 18 expands from a cylindrical small diameter part 20 having the same diameter as or a small diameter as the inner diameter of the branch pipe 14, and from the expanded diameter part 22 to a cylindrical large diameter part 24 having the same diameter as the main pipe 12. The height H1 of the large diameter portion 24 is larger than the height H2 of the branch pipe 14 of the branch pipe 10.

  The diameter expansion mold 18 and the branch pipe 10 are heated with a heater or the like to, for example, a heat deformation temperature of about 100 to 150 degrees of vinyl chloride resin, and the small diameter portion 20 of the diameter expansion mold 18 is connected to the branch pipe 10. It inserts into the branch pipe 14 from the outside of the branch pipe 14. Then, the enlarged diameter portion 22 of the diameter expansion mold 18 is press-fitted into the branch pipe 14, and the diameter of the branch pipe 14 is gradually increased in accordance with the diameter of the diameter expansion mold 18 to expand the diameter into the branch pipe 14. Insert up to the large diameter portion 24 of the metal mold 18.

  As shown in FIG. 3, due to the press-fitting of the diameter-expanding mold 18, the periphery of the base portion 14 a of the branch pipe 14 at the upper side wall of the main pipe 12 falls to the inside of the main pipe 12, and the main pipe 12 of this portion 26 is dropped. Will be reduced in diameter. Therefore, as shown in FIG. 4, the slack shaping jig 28 is arranged to push up the slack portion 26 of the main pipe 12 from the inside to the outside of the main pipe 12. As shown in FIG. 5, the slack shaping jig 28 has a prismatic shape, and the upper surface has a circular top shape, that is, an arc shape in the direction of the main pipe 12 pipe axis, and an arc shape in the direction orthogonal to the main pipe 12 pipe axis. Shape.

  When the main pipe 12 is shaped, the sagging portion 26 of the side wall of the main pipe 12 is slightly enlarged, and the effective cross-sectional area of the main pipe 12 is maintained without decreasing.

  As shown in FIG. 6, the diameter expansion metal fitting 18 is finally removed from the branch pipe 14, and the support pipe 16 and the slack shaping jig 28 are removed from the main pipe 12. After applying vinyl adhesive or the like, the branch pipe connecting portion 32 serving as the rubber ring receiving port 30 is inserted and assembled.

  In this way, by using the commercially available branch pipe 10 having the branch pipe 14 having a smaller diameter than the main pipe 12, the diameter expansion die 18 is inserted into the branch pipe 14 from the outside of the branch pipe 14 to expand the diameter of the branch pipe 14. As a result, the branch pipe 14 can have the same diameter as the main pipe 12. At this time, the main pipe 12 is slackened and reduced in diameter by the press-fitting of the diameter-expanding die 18, but the diameter is reduced between the main pipe 12 and the branch pipe 14 because the main pipe 12 is shaped using the slack shaping jig 28. No part is formed, and operations such as maintenance of the main pipe 12 and the branch pipe 14 can be easily performed. Further, this method does not require complicated processing or a large-scale manufacturing apparatus, and the branch pipe 10 can be manufactured easily and at low cost.

  Further, since the diameter expansion die 18 is inserted to expand the diameter of the branch pipe 14, the type of the branch pipe 10 is not limited, and it is also applicable to such a ribbed hard polyvinyl chloride resin branch pipe 10. Of course, it can be applied to other types of branch pipes without ribs.

  Although the diameter of the branch pipe 14 is increased using the diameter expansion mold 18, the diameter of the branch pipe 14 may be increased using a mold having an expansion / reduction function instead. Alternatively, the diameter of the branch pipe 14 may be increased by feeding compressed gas into a rubber tube or the like.

  In addition, although the branch pipe 10 having both ends of the diameter expansion receptacle is used, the diameter extension receptacle may not be provided on the branch pipe. When the support pipe 16 is inserted into this branch pipe, the support pipe 16 is disposed at least outside the diameter Φ1 of the main pipe 12 around the opening edge 14a of the branch pipe 14 in the pipe axis direction of the main pipe 12, and When the diameter of the support tube 16 is increased, the support tube 16 does not get in the way.

It is sectional drawing which shows the state which inserted the support pipe in the branch pipe which provides a branch pipe with a diameter smaller than a main pipe. It is sectional drawing which shows the state which inserted the metal mold | die for diameter expansion in the branch pipe of the branch pipe of FIG. It is sectional drawing which shows the state which expanded the branch pipe of the branch pipe of FIG. It is sectional drawing which shows the state which shape | molded the slack part of the branch pipe of FIG. 3 with the jig | tool for slack shaping. It is a perspective view which shows the jig | tool for slack shaping. It is sectional drawing which shows the branch pipe in which the slack part was shaped. It is sectional drawing which shows the state which attached the branch pipe connection part to the branch pipe of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Branch pipe 12 ... Main pipe 14 ... Branch pipe 18 ... Diameter expansion die 28 ... Slack shaping jig 32 ... Branch pipe connection part

Claims (2)

(A) Prepare a branch pipe whose main pipe diameter is larger than the branch pipe diameter as the original pipe,
(B) expanding the diameter of the branch pipe by heating;
(C) A branch pipe manufacturing method in which a deformed portion of the main pipe at the base of the branch pipe is extruded from the inside to the outside of the main pipe, and (d) a branch pipe connecting portion is attached to the branch pipe. In branch pipes with branch pipe connections attached to branch pipes,
The branch pipe is heated and expanded using a branch pipe having a main pipe diameter larger than that of the branch pipe as an original pipe, and a deformed portion generated in the branch pipe portion when the branch pipe is heated and expanded from the inside of the main pipe. Branched tube characterized by being extruded.

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