JP2008069799A - Method and device for correcting buckling of resin pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely correct the buckling of a resin pipe by a simple method even if the resin pipe is buckled after laid down. <P>SOLUTION: This method of buckling correction using a correction member for correcting the buckled part of a resin pipe at the curved part comprises an insertion step of inserting the correction member to the outer periphery of the longitudinal portion of the buckled part of the resin pipe and/or the outer periphery of the buckled part so that the inside of the correction member is moved close thereto, an internal contraction step of reducing the space inside the correction member, and a correction step of correcting the buckled part into a circular shape by fitting the inside of the correction member to the outer periphery of the resin pipe to form the cross section of the inside of the correction member into a circular shape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and a correction tool for correcting a buckled portion of a resin pipe, for example, for water supply or hot water supply used in construction.

  Pipes such as water and hot water used in construction have been using straight pipes such as steel pipes and rigid PVC pipes for a long time, but in recent years, flexible cross-linked polyethylene and polybutene (hereinafter referred to as flexible pipes) are used. Has been increasingly used. In addition, the drainage pipe has conventionally secured a drainage gradient with a straight pipe. However, as described in JP 2006-037455 “Drainage Structure” (Asahi Kasei Homes), it is a flexible pipe. A new drainage system that is not bound by the drainage gradient using water is proposed, and the range of use of flexible pipes is expanding.

  The feature of these flexible pipes is that there is no joint in the middle of the piping path. In the case of a straight pipe, it was necessary to cut the pipe to a predetermined length and change the direction using a joint. However, in the case of a flexible pipe, these operations are not required and workability is good. The risk of water leakage due to defects can also be avoided.

  However, even though it is flexible, the cross-linked polyethylene and polybden have a bending radius limit of about 30 cm, and when working in a narrow space, the bending radius is inadvertently bent beyond the plastic limit. May end up. Then, it buckles and the cross section becomes flat, the water flow resistance increases, and in the case of drainage, there is a possibility that the foreign matter that has flowed will be clogged. And once buckled, even if the tube is straightened, the cross section will not return to a circle, and even if it is bent smoothly like before buckling, the buckled part will buckle again, The only way to solve this problem was to replace the entire tube or cut the tube to remove the buckled portion. However, the method of exchanging all the pipes must re-fix the pipes that have been done so far, and the method of removing the buckled part not only impairs the above-mentioned merit that there is no risk of water leakage because the joint is interposed, In the drainage application, there was a risk of foreign matter getting caught at the joint.

  When inserting the resin pipe into the existing pipe, there is a method of correcting the deformation by pressurizing the inside of the resin pipe after inserting the resin pipe in a heat-softened state (for example, see Patent Document 1). Thereby, buckling of the resin pipe in the bent portion can be avoided.

JP 2004-144137 A

  Therefore, an object of the present invention is to reliably correct the buckling of the resin pipe at a low cost even when the resin pipe is buckled after laying.

  In order to achieve the above object, a first buckling correction method of the present invention is a buckling correction method using a correction member that corrects a buckling portion in a curved portion of a resin tube, wherein the buckling in the resin tube is performed. An insertion step for inserting the outer periphery of the front and rear portions of the bending portion and / or the outer periphery of the buckling portion closer to the inside of the correction member, and an internal reduction step for reducing the internal space of the correction member And a correction step of correcting the buckling portion to a circle by bringing the inside of the correction member and the outer periphery of the resin tube into close contact with each other and making the cross section of the inside of the correction member circular. It is characterized by.

  The second buckling straightening method is a buckling straightening method using a straightening member for straightening the buckling portion in the curved portion of the resin tube, and the outer circumference of the front and back portions of the buckling portion in the resin pipe and / or Alternatively, an insertion step of inserting the outer periphery of the buckling portion so as to be close to the inside of the correction member having a hollow circular cross section, and an internal reduction step of reducing the cross section of the hollow circular shape of the correction member; A correction step of correcting the buckling portion by bringing the inner surface of the correction member into close contact with the outer periphery of the resin tube.

  The third buckling straightening method is a buckling straightening method using a straightening member for straightening the buckling portion in the curved portion of the resin tube, and the outer periphery of the front and back portions of the buckling portion in the resin tube and / or Alternatively, the outer periphery of the buckling portion is composed of at least two members, and each cross section of the members becomes a part of a circle so as to be close to the inside of the correction member that has a circular cross section. An insertion step of inserting, an internal reduction step of reducing the internal space of the correction member, an inside of the correction member and the outer periphery of the resin tube are brought into close contact with each other, and a cross section of the inside of the correction member is circular And a correction step of correcting the buckling portion into a circular shape.

  Moreover, the 1st buckling correction tool of this invention for achieving the said objective is a buckling correction tool which corrects the buckling part of a resin pipe, Comprising: The part before and behind the said buckling part in the said resin pipe A correction member into which the outer periphery of the buckling portion and / or the outer periphery of the buckling portion are inserted, and an internal space adjustment member that adjusts the internal space of the correction member, and the internal space adjustment member of the correction member When the inner space is reduced and the inner surface of the correction member is brought into close contact with the outer periphery of the resin tube, the inner space of the inner surface of the correction member is circular.

  In the first buckling correction method, in the insertion stage, the outer periphery of the front and back portions of the resin tube and / or the outer periphery of the buckling part is brought close to the inside of the correction member, and correction is performed in the internal reduction stage. By reducing the inside of the member, the inside of the correction member gradually presses the buckled portion of the resin tube. Thereafter, in the correction step, the inside of the correction member and the outer periphery of the resin tube are brought into close contact with each other, and when the cross section of the correction member is circular, the buckled portion having a flat cross section is corrected to a circular shape. be able to. For this reason, even if it is a case where buckling generate | occur | produces in the resin pipe | tube after laying, buckling can be corrected reliably by a simple method.

  In the second buckling correction method, the correction member has a hollow circular cross section. Then, when the internal diameter of the correction member is reduced in the internal reduction stage, the internal cross section can always be kept circular. Thereby, the resin pipe can be corrected regardless of the difference in the diameter of the resin pipe.

  In the third buckling correction method, the correction member is composed of at least two members, and each member has a circular cross section by fitting each cross section into a part of a circle. Then, it is not necessary to insert the correction member from the end portion of the resin tube and move it to the buckling portion. For this reason, since corrective work can be performed after arrange | positioning a correction member directly around the buckling part of a resin pipe, the workability | operativity of corrective work improves.

  According to the first buckling corrector, since the internal space has a correction member and an internal space adjustment member such that the inner space is circular, the above-described method can be reliably performed, and the resin tube can be buckled. It can be reliably corrected by a simple method.

  As is well known, the circle is a figure having the shortest outer peripheral length compared to the area. For this reason, when a tube whose buckling is flattened and its shape is gradually returned to a circular shape with a correction member, the cross-sectional area in the tube increases.

  In the present invention, since the buckled tube can be corrected and used as it is, there is no need to arrange a new tube or rework the piping work. This not only avoids extending the construction time, but also reduces waste and effectively uses resources.

  Moreover, the inner surface of the tube after straightening is as smooth as when it did not buckle. There is no risk of water leakage compared to the method that cuts the tube and removes the buckled part, and uses a joint. Especially when the fitting specified for the pipe is an insertion type (joint that is inscribed inside the pipe), piping The effect of avoiding an increase in resistance is great.

  The straightening member is left attached to the outer periphery of the tube after buckling correction, so that the straightened inner surface of the tube is smooth and circularly maintained.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

(Buckling correction tool 10)
The structure of the buckling corrector 10 of this embodiment is demonstrated using FIG. FIG. 1 is an explanatory diagram of a buckling corrector 10 according to the first embodiment. 1A is a perspective view, FIG. 1B is a diagram showing a diameter when the resin tube is inserted, and FIG. 1C is a diagram showing a diameter when the resin tube is corrected.

  As shown in FIG. 1A, a buckling corrector 10 according to this embodiment includes a correction member 11 having a hollow circular cross section, and an internal space adjustment member 12 that adjusts the size of the space inside the correction member 11. And have.

  The straightening member 11 is formed by rounding a long plate-shaped metal plate to have a hollow circular cross section as shown in FIG. A resin tube can be inserted through the hollow portion of the correction member 11. The internal space adjusting member 12 adjusts the inner diameter of the correcting member 11 by changing the length of the correcting member 11 by rotating a rotating shaft 12a that is rotated by a screw or a screw.

  As shown in FIG. 1B, the buckling corrector 10 has a large inner diameter R1 before the correction member 11 is squeezed. Here, when the rotation shaft 12a of the internal space adjustment member 12 is rotated, the tip 11a of the correction member 11 protrudes to the outside of the internal space adjustment member 12, and the correction member 11 is squeezed. As a result, the inner diameter R2 (R2 <R1) of the correction member 11 is reduced.

(Buckling correction method using buckling corrector 10)
The buckling correction method of this embodiment is demonstrated using FIG. FIG. 2 is an explanatory diagram illustrating a procedure of the buckling correction method according to the first embodiment. 2A is an explanatory diagram before the buckling corrector 10 is inserted through the resin tube 1, FIG. 2B is an explanatory diagram when the buckling corrector 10 is inserted through the resin tube 1, and FIG. It is explanatory drawing when the resin pipe | tube 1 is corrected with the correction tool 10. FIG.

  As shown in FIG. 2 (a), when the buckling portion 1a that is buckled at the bent portion of the resin tube 1 is corrected, the resin tube 1 is connected to the buckling correction tool 10 from its end. The correction member 11 is inserted so as to be close to the inside. Then, as shown in FIG. 2 (b), the resin tube 1 is moved until the buckling corrector 10 comes to the position of the outer periphery of the buckling portion 1a of the resin tube 1 or the outer periphery of the buckling portion 1a itself. Insert (insertion stage). In this state, as shown in the right diagram of FIG. 2B, the buckling portion 1a does not receive any force from the correction member 11, so that the inside is crushed and the inside is crushed.

  Next, by rotating the rotation shaft 12a of the internal space adjusting member 12 and narrowing the correction member 11, the space (inner diameter) inside the correction member 11 is reduced. Thus, when the inner diameter of the correction member 11 becomes smaller, the inner periphery of the correction member 11 and the outer periphery of the resin tube 1 come into contact (internal reduction stage).

  When the inner periphery of the correction member 11 is further reduced, the inner periphery of the correction member 11 and the outer periphery of the resin tube 1 are brought into close contact with each other as shown in FIG. Here, since the cross-sectional shape inside the correction member 11 is a circle, the outer periphery of the buckling portion 1a of the resin tube 1 is pressed along this circle and deformed into a circle. As a result, the section of the other resin tube 1 in contact with the buckling portion 1a and the correction member 11 is corrected to a circle by the pressing force of the correction member 11 (correction stage).

  As described above, in the present embodiment, the internal cross section of the correction member 11 is circular, and the internal cross section of the correction member 11 is reduced in diameter by the internal space adjustment member 12. As a result, the buckled portion 1a of the resin tube 1 in contact with the inside of the correction member 11 is corrected into a circle. As a result, even when buckling occurs in the resin tube after laying, the buckling of the resin tube can be reliably corrected by a simple method.

  In addition, the correction member is left attached to the outer periphery of the tube after buckling correction, so that the inner surface of the corrected tube is smooth and the circular shape is maintained permanently.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIGS. The same components as those described above are denoted by the same reference numerals and description thereof is omitted.

(Buckling correction tool 20)
The structure of the buckling corrector 20 of this embodiment is demonstrated using FIG. FIG. 3 is an explanatory diagram of a buckling corrector 20 according to the second embodiment. 1A is a perspective view, FIG. 1B is a diagram showing a diameter when the resin tube is inserted, and FIG. 1C is a diagram showing a diameter when the resin tube is corrected.

  As shown in FIG. 3 (a), the buckling corrector 20 of the present embodiment is composed of two members and each member has a circular cross section by fitting each cross section into a part of a circle. The correction members 21 and 22 and the inner space adjustment member 23 for adjusting the size of the space inside the semicircular arch of the correction members 21 and 22.

  The correction members 21 and 22 are formed with correction portions 21a and 22a each having a semicircular arch shape on the inner periphery, and fixing portions 21b and 22b to which the internal space adjustment member 23 is fixed. The internal space adjusting member 23 is inserted through the holes of the fixing portions 21b and 22b, and in this embodiment, bolts 23a and nuts 23b are used. The internal space adjusting member 23 is not limited to bolts and nuts, and other known fixing members can be used. For this reason, the holes of the fixing portions 21b and 22b are not essential and are formed according to the fixing member.

  As shown in FIG. 3B, the buckling corrector 20 has a wide interval L1 between the correction portion 21a and the correction portion 22a until the correction member 21 and the correction member 22 are brought into contact with each other. Here, when the bolt 23a and the nut 23b of the internal space adjusting member 23 are tightened, the interval between the fixing portions 21b and 22b of the correction members 21 and 22 is reduced, and as shown in FIG. 3C, the interval between the correction portions 21a and 22a. L2 is also narrowed. When the correction member 21 and the correction member 22 are brought into contact with each other by the internal space adjusting member 23, the inner circumference of the correction portions 21a and 22a is semicircular, and therefore the inner circumference of the correction portion is circular in cross section.

(Buckling correction method using buckling corrector 20)
The buckling correction method of this embodiment is demonstrated using FIG. FIG. 4 is an explanatory view showing the procedure of the buckling correction method according to the second embodiment. 4A is an explanatory diagram before the buckling corrector 20 is disposed in the buckling portion 1a of the resin tube 1, and FIG. 4B is a diagram illustrating the buckling portion 1a of the resin tube 1 with the correcting member 21 and the correcting member 22. An explanatory view when sandwiched, (c) is an explanatory view when the resin pipe 1 is corrected by the buckling corrector 20.

  As shown in FIG. 4A, when the buckling portion 1 a of the resin tube 1 is corrected, the buckling portion 1 a is sandwiched between the correction member 21 and the correction member 22. Then, as shown in FIG. 4 (b), the resin tube 1 buckling portion 1 a is placed between the semicircular arch-shaped correction portion 21 a of the correction member 21 and the semicircular arch-shaped correction portion 22 a of the correction member 22. Insert it like a circle (insertion stage). In this state, the buckling portion 1a receives no force from the correction members 21 and 22 as shown in the right diagram of FIG. For this reason, it is buckled and the inside is crushed.

  Next, a bolt 23a and a nut 23b, which are internal space adjusting members 23, are inserted into the holes of the fixing portion 21b and the fixing portion 22b to narrow the interval between the fixing portions 21b and 22b. Thereby, the space inside correction | amendment part 21a, 22a becomes small. When the internal space becomes small in this way, the inner periphery of the correction member 21 and the outer periphery of the resin tube 1 come into contact (internal reduction stage).

  When the inner circumferences of the correction members 21 and 22 are further reduced, the inner circumferences of the correction portions 21a and 22a and the outer circumference of the resin tube 1 are brought into close contact with each other as shown in FIG. Here, since the cross-sectional shape when the correction portions 21a and 22a are fitted is a circle, the outer periphery of the buckling portion 1a of the resin tube 1 is pressed along the circle and deformed into a circle. As a result, the other sections of the resin pipe 1 in contact with the buckling portion 1a and the correction members 21 and 22 are corrected into a circle by the pressing force of the correction members 21 and 22 (correction stage).

  In this embodiment, the straightening member is composed of two straightening members 21 and 22, each of which has a circular cross section when fitted into a part of a circle. Then, it is not necessary to insert the correction member from the end portion of the resin tube 1 and move it to the buckling portion 1a as in the first embodiment. For this reason, the correction members 21 and 22 can be arranged directly around the buckling portion 1a of the resin tube 1 to perform the correction work, and the workability of the correction work can be improved.

  In the present embodiment, the two correction members 21 and 22 are fastened by the two bolts 23a and the nut 23b, but the present invention is not limited to this. For example, a buckling corrector 30 as shown in FIG. 5 may be used. The buckling corrector 30 may be configured such that one end of the two correction members 31, 32 is hinged by a hinge 34, and the other end is fastened by a flat fixing portion 31b, 32b by a bolt 33a and a nut 33b. . In this way, the number of members can be reduced, and the buckling portion can be directly sandwiched, and the buckling can be corrected easily and reliably. In addition, the cross-sectional shape when the correction | amendment parts 31a and 32a of the correction | amendment members 31 and 32 fit is circular similarly to this embodiment.

  The present invention can be used not only for a buckled resin tube but also for a method and a correction tool for correcting a buckled portion of a flexible tube.

Explanatory drawing of the buckling correction tool 10 which concerns on 1st Embodiment. Explanatory drawing which shows the procedure of the buckling correction method which concerns on 1st Embodiment. Explanatory drawing of the buckling correction tool 20 which concerns on 2nd Embodiment. Explanatory drawing which shows the procedure of the buckling correction method which concerns on 2nd Embodiment. Explanatory drawing of the buckling correction tool 30 which concerns on the modification of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Resin pipe, 1a ... Buckling part, 10 ... Buckling correction tool, 11 ... Correction member, 11a ... Tip, 12 ... Internal space adjustment member, 12a ... Rotating shaft, 20 ... Buckling correction tool, 21 ... Correction member 21a ... correction part, 21b ... fixing part, 22 ... correction member, 22a ... correction part, 22b ... fixing part, 23 ... internal space adjustment member, 23a ... bolt, 23b ... nut, 30 ... buckling correction tool, 31 ... Correction member, 31a ... Correction portion, 31b ... Fixed portion, 32 ... Correction member, 32a ... Correction portion, 32b ... Fixed portion, 33a ... Bolt, 33b ... Nut, 34 ... Hinge

Claims (4)

A buckling correction method using a correction member that corrects a buckling portion in a curved portion of a resin tube,
An insertion step of inserting the outer periphery of the front and back portions of the resin tube and / or the outer periphery of the buckling portion so as to be close to the inside of the correction member;
An internal reduction step for reducing the internal space of the correction member;
A correction step of correcting the buckling portion into a circle by bringing the inside of the correction member and the outer periphery of the resin tube into close contact with each other, and making the cross section of the inside of the correction member circular.
A buckling correction method characterized by comprising: A buckling correction method using a correction member that corrects a buckling portion in a curved portion of a resin tube,
An insertion step of inserting the outer periphery of the front and back portions of the resin tube and / or the outer periphery of the buckling portion so as to be close to the inside of the correction member having a hollow circular cross section;
An internal reduction step of reducing the cross-section of the hollow circle of the straightening member;
A correction step of correcting the buckling portion by bringing the inner surface of the correction member into close contact with the outer periphery of the resin tube;
A buckling correction method characterized by comprising: A buckling correction method using a correction member that corrects a buckling portion in a curved portion of a resin tube,
The outer circumference of the front and rear portions of the resin tube and / or the outer circumference of the buckling portion is composed of at least two members, and each member has a circular shape by fitting each cross section into a part of a circle. An insertion step of inserting so as to be close to the inside of the correction member that has a cross section;
An internal reduction step for reducing the internal space of the correction member;
A correction step of correcting the buckling portion into a circle by bringing the inside of the correction member and the outer periphery of the resin tube into close contact with each other, and making the cross section of the inside of the correction member circular.
A buckling correction method characterized by comprising: A buckling corrector that corrects the buckling part of a resin tube,
A correction member into which the outer periphery of the front and rear portions of the resin tube and / or the outer periphery of the buckling portion is inserted;
An internal space adjusting member for adjusting the internal space of the correction member;
Have
When the internal space adjustment member reduces the internal space of the correction member and brings the inner surface of the correction member into close contact with the outer periphery of the resin tube, the internal space of the inner surface of the correction member is A buckling corrector characterized by being circular.

Images