JP2007290286A - Receiving port molding method of ribbed pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly raise the neck part of the receiving port of a ribbed pipe so as not to form a gap to the connection part of the ribbed pipe. <P>SOLUTION: The ribbed pipe 10 made of a thermoplastic resin is fixed to be heated and softened at its end part while a shaping mold 2 is inserted in the end part of the ribbed pipe 10 and, after the diameter expanding part 21 thereof is diametrically expanded to form a receiving port part 102, the shaping mold 2 is advanced toward the ribbed pipe 10 while the diameter expanding part 21 is diametrically expanded to raise the neck part 104 of the receiving port. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for forming a receiving portion of a ribbed tube.

  Conventionally, a pipe with a rib that can be embedded in a quarry foundation having excellent earthquake resistance has been proposed and widely used. As shown in FIG. 6, the ribbed tube 10 is configured by arranging a large number of annular ribs 12 in parallel on the outer peripheral surface of the tube body 11 at intervals, and has excellent crushing resistance due to the reinforcing effect of the ribs 12. have. Such a ribbed tube 10 is formed in the straight tube portion 101 except for one end portion, and one end portion is formed in a receiving port portion 102 whose diameter is larger than that of the straight tube portion 101. The straight pipe portion 101 of the other ribbed pipe 10 can be connected to the pipe (see, for example, Patent Document 1).

Note that the receiving portion 102 of the ribbed tube 10 is an end portion of the ribbed tube 10 that is formed by allowing the end of the ribbed tube 10 to be heated and softened so that the divided segment (expanded portion) can be expanded. And is formed by expanding the segment of the shaping mold (see, for example, Patent Document 2).
JP 2000-28045 A JP-A-10-34746

  By the way, the receiving port portion 102 of the ribbed tube 10 described above is formed by inserting a shaping mold at its end portion and expanding the expanded diameter portion, so that the formed receiving port portion 102 and the straight tube portion are formed. The angle formed by the straight neck portion 101 of the receiving neck portion 103 connecting to the head 101 is gently formed based on the rigidity associated with variations in heating. Therefore, when the ribbed tube 10 is buried, when the straight tube portion 101 of the other ribbed tube 10 is inserted into the receiving portion 102 of the one ribbed tube 10, as shown in FIG. A gap x is formed between the rising portion of the receiving neck portion 103 in the ribbed tube 10 from the straight tube portion 101 and the distal end portion of the straight tube portion 101 in the other ribbed tube 10 inserted. As a result, the gap x formed in the connecting portion of the ribbed tube 10 is likely to be clogged with sand and dust, and when the dust is clogged, the dust protrudes into the pipeline, and the pipe resistance is reduced. There is a risk of increasing the flow and hindering smooth flow.

  Further, when the rib portion 12 is located at the receiving neck portion 103 when the receiving portion 102 is formed, the quarry collides with the rib 12 and the rib 12 may be broken.

  The present invention has been made in view of such problems, and a rib that can reliably raise the receiving neck of the ribbed tube so that no gap is formed in the connecting portion of the ribbed tube. The present invention provides a method for forming a receiving portion of an attachment tube.

  The present invention fixes a ribbed tube made of a thermoplastic resin in which a large number of annular ribs are arranged side by side on the outer peripheral surface of a tube body to heat and soften the end portion and apply it to the end portion of the ribbed tube. After inserting the mold and expanding the diameter-expanded part to form the receiving part, the shaped mold is advanced with respect to the ribbed tube while the expanded part is expanded, and the receiving neck is raised. It is characterized by raising.

  According to the present invention, the ribbed tube carried in facing the shaping mold is fixed and the end portion is heated and softened. Next, the shaping mold is inserted into the end portion of the ribbed tube, the enlarged diameter portion is expanded to form the receiving portion, and then the shaping mold is expanded while the expanded diameter portion is expanded. To the front and raise the receiving neck.

  As a result, the receiving neck of the ribbed tube can surely rise up steeply, and when the ribbed tube is embedded, when the straight tube portion of the ribbed tube is inserted into the receiving portion of the ribbed tube, There is no gap formed between the rising portion of the receiving neck from the straight tube portion of the ribbed tube and the tip of the straight tube portion of the inserted ribbed tube. Therefore, it is possible to prevent clogging of dust and the like at the connecting portion of the ribbed tube.

  In the present invention, when the tip of the diameter-enlarged portion of the shaping mold is advanced to the base of the rib of the ribbed tube, the rib can be reliably positioned at the base of the receiving portion of the ribbed tube with the receiving neck. It is possible to prevent the quarry from colliding with the rib and being damaged.

  According to the present invention, the receiving neck of the ribbed tube can be reliably raised so that no gap is formed in the connecting portion of the ribbed tube.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, prior to describing the method for forming the receiving portion of the ribbed tube of the present invention, the ribbed tube 10 having the receiving portion 102 formed by the forming method of the present invention will be described.

  As shown in FIG. 4, the ribbed tube 10 has a receiving neck 104 that connects the receiving portion 102 and the straight tube portion 101 with a steep slope with respect to the straight tube portion 101, for example, at an angle of about 55 degrees or more. It has been launched. When the ribbed tube 10 is buried, when the straight tube portion 101 of the other ribbed tube 10 is inserted into the receiving portion 102 of the one ribbed tube 10, as shown in FIG. The rising portion from the straight tube portion 101 of the receiving neck portion 104 in the attached tube 10 and the tip of the straight tube portion 101 in the other ribbed tube 10 inserted are substantially in contact, and a gap is formed between them. There is no.

  In addition, the rib 12 is located at the base of the receiving neck portion 104 of the receiving tube portion 102 of the ribbed tube 10 and does not exist in the receiving neck portion 104. Therefore, when the rib 12 is positioned at the receiving neck 104, it is possible to prevent the quarry from colliding and damaging the rib 12.

  A method for forming the receptacle 102 of the ribbed tube 10 will be described with reference to FIG.

  First, after fixing the ribbed tube 10 carried in opposition to the molding apparatus 1 through the two-part clamp 3, the end portion of the ribbed tube 10 facing the shaping mold 2 is made using steam or the like. Heat and soften (see FIG. 1 (a)).

  Next, the shaping die 2 is advanced and inserted into the end portion of the heat-softened ribbed tube 10 (see FIG. 1B), and then the diameter-expanded portion 21 is expanded so that the ribbed tube 10 A receiving portion 102 is formed at the end (see FIGS. 1C and 2). Thereby, the receiving neck part 103 which connects the receiving port part 102 and the straight pipe part 101 at a moderate angle is formed. Thereafter, the shaping mold 2 is further advanced while the diameter-enlarged portion 21 is expanded, whereby the receiving neck portion 103 that connects the receiving port portion 102 and the straight pipe portion 101 is changed to the enlarged-diameter portion 21 in the shaping die 2. The receiving neck portion 104 is formed so that the angle formed with the straight tube portion 102 is steeply raised (see FIGS. 1D and 3). At this time, the tip of the enlarged diameter portion 21 of the shaping mold 2 is advanced to the base of the rib 12 of the receiving port portion 102 at the connection portion between the receiving port portion 102 and the receiving neck portion 104.

  Specifically, the height and pitch of the ribs 12 are set according to the diameter of the ribbed tube 10, and the inner diameter of the receiving port 102 is set, and the ribbed tube 10 is an intermediate between the ribs 12 and 12. The end surface is formed by cutting. In consideration of the expansion of the ribbed tube 10 due to heating and pressing under these conditions, the rising angle of the receiving neck portion 104 with respect to the straight tube portion 101 is determined, and accordingly, the tip of the enlarged diameter portion 21 in the shaping mold 2 The rising angle of the surface is determined, and further, the insertion stroke of the shaping mold 2 and the forward stroke for raising the receiving neck 103 are determined. As a result, the rib 12 is reliably positioned at the base of the receiving port portion 102 with the receiving neck portion 104 and is not positioned at the receiving neck portion 104.

  As a result, the receiving neck portion 104 raised to a steep slope corresponding to the shape of the tip surface of the enlarged diameter portion 21 of the shaping mold 2 is surely provided, and the rib 12 is formed at the base of the receiving mouth portion 102 with the receiving neck portion 104. Can be reliably positioned, and the receiving portion 102 of the ribbed tube 10 can be formed.

  As described above, according to the present invention, since the receiving neck of the ribbed tube can be formed with the receiving neck raised up steeply, the connecting portion of the ribbed tube is clogged with dust and the like. Without causing sewage to flow smoothly over a long period of time.

It is process drawing explaining the receptacle part shaping | molding method of the pipe with a rib of this invention. FIG. 2 is a partially enlarged cross-sectional view showing a part of the receiving part with a part of the receiving part omitted in the molding step of FIG. FIG. 2 is a partially enlarged cross-sectional view showing a part of the receiving part with a part omitted in the molding step of FIG. It is a half cross-sectional view showing a ribbed tube having a receiving port formed by the receiving port forming method for a ribbed tube of the present invention. It is sectional drawing which abbreviate | omits and shows the connection state of the ribbed pipe | tubes by which the receiving part was shape | molded by the receiving part shaping | molding method of the ribbed pipe of this invention. It is a half cross-sectional view showing a ribbed tube having a receiving portion formed by a conventional method of forming a receiving portion of a ribbed tube. It is sectional drawing which abbreviate | omits and shows the connection state of the ribbed pipe | tubes by which the receptacle part was shape | molded by the conventional receptacle part shaping | molding method of a pipe with a rib.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding apparatus 2 Shaping die 21 Expanded diameter part 3 Clamp 10 Pipe with rib 11 Pipe main body 12 Rib 101 Straight pipe part 102 Receiving part 104 Receiving neck part

Claims (2)

  A tube with a rib made of thermoplastic resin with a large number of annular ribs arranged at intervals on the outer peripheral surface of the tube body is fixed by heating and softening the end, and a shaping die is attached to the end of the tube with rib After inserting and expanding the enlarged diameter part to form the receiving part, the shaping mold is advanced with respect to the ribbed tube while the enlarged diameter part is enlarged, and the receiving neck part is raised. A method for forming a receiving portion of a ribbed tube.   The method for forming a receiving portion of a ribbed tube according to claim 1, wherein the tip of the enlarged diameter portion of the shaping mold is advanced to the base of the rib of the ribbed tube.

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