JP2008236976A - Pipe material for forming underground conduit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe material for forming an underground conduit which is formed into a structure that prevents a pipe wall from being worn and broken due to friction with a cable when the cable is inserted into the inside of a pipe even though it has pressure-resistant strength against deformation due to earth pressure, can be changed into a shortened state, and is a pipe body that allows bent piping depending on the terrain. <P>SOLUTION: An inequilateral-triangle-shaped pipe wall 1 part formed on the whole or a part of the pipe wall 1 is configured as follows. Right and left inclined walls 3, 4 continuous to the ridge part 2 are formed into short and long unequal lengths. A wall thickness T on the valley part 5 side of one long-side inclined wall 3 is formed thicker compared with a wall thickness t on the valley part 5 side of the other short-side inclined wall 4. The long-side inclined wall 3 and the short-side inclined wall 4 are formed so as to be deformable into two postures, that is, a separated posture opened in a V-shape in a cross-sectional view and a superimposed posture that the short-side inclined wall 4 is superimposed on the long-side inclined wall 3 via a freely refractive hinge part 6. The hinge part 6 is formed so as to be further displaced in a direction of the short-side inclined wall 4 than the position of the smallest diameter part p in the long-side inclined wall 3 in a pipe-axis direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention mainly comprises a cable protection tube for forming an underground conduit for protecting a communication cable such as an electric wire, a telephone line or an optical cable, and a composite suitable for use as a joint for the cable protection tube. The present invention relates to a resin underground pipe forming cylinder.

  More specifically, the whole or at least a part of the cylindrical wall constituting the cylindrical material can self-hold two stable lengths, a normal posture extended in the cylindrical axis direction and a shortened posture reduced in the cylindrical axis direction. The present invention relates to a structured cylinder.

  Conventionally, underground pipe forming cylinder materials for protecting underground cables such as electric wires, telephone lines or optical cables, and in particular, cable protection pipes of various structures have been implemented, Its existence is generally known.

  On the other hand, a cylindrical body formed of a synthetic resin material and having a structure capable of self-maintaining two stable lengths, that is, a normal posture extended in the axial direction and a shortened posture reduced in the axial direction is, for example, a food Beverage straws are generally well known for use, and air blowers for futon dryers and drainage hoses for washing machines are known for non-food use.

  Each of these cylindrical bodies has a substantially triangular cross-sectional shape of the cylindrical wall, one inclined wall and the other inclined wall are separated in an octagonal shape, one inclined wall and the other inclined wall, Can be changed to a superposed polymerization state, and these two states can be self-maintained.

  For example, Japanese Patent Publication No. 56-45032 (Patent Document 1) and Japanese Patent Application Laid-Open No. 5-180377 are pipes in which the cylindrical wall can be freely expanded and contracted so that the expanded state and the contracted state can be self-held. As is seen in (Patent Document 2), it is already known.

Among these, in the former literature, as a pipe having two stable lengths in the axial direction,
Of the adjacent inclined walls 2 and 5 forming a substantially triangular waveform, a thin wall portion is provided at a position slightly apart from the protruding flange portion 3 of the pipe 1 on one inclined wall 2, and the valley bottom portion 4 or a position portion close thereto is provided. Also shown is a pipe structure which has a thin wall portion so that the pipe 1 can be easily expanded and contracted for switching between long and short.

The latter document shows a synthetic resin pipe with pressure-resistant flatness that is buried in the ground, such as a wire protection pipe and a water and sewage pipe. Specifically, it is made of a hard material. Of the two inclined walls 3, 4 of the cylindrical wall 1, the portion 2 a near the peak 2 of the inclined wall 3 and the valley bottom 5 or the portion 5 a near the valley bottom 5 are partially flexible resin. By forming with a material, it is possible to shift one inclined wall in the direction close to the other inclined wall with a flexible resin material part as a fulcrum, and to be able to hold its posture by itself A pressure tube for underground burial is shown.
Japanese Examined Patent Publication No. 56-45032 JP-A-5-180377

  The former pipe as a prior art is one in which a thin wall portion is formed on the pipe wall so that the expansion and contraction posture is changed using the thin wall portion. In the latter pressure-resistant synthetic resin pipe, The part of the cylindrical wall formed of a hard material is partially formed of a flexible resin material, so that the flexible posture can be changed using the flexible resin material portion. Therefore, the technical ideas of the techniques shown as these conventional techniques are based on a common idea that a part that is more easily bent than the other part is formed in a part of the pipe wall or the cylinder wall. Is.

  However, forming a portion that is easy to bend in a part of the cylindrical wall in this way sacrifices pressure flattening strength in order to change the expansion and contraction posture in the tube axis direction by providing a portion that is weak in pressure-resistant deformation strength on the cylindrical wall. It is based on the technical idea of making. Therefore, in order to reinforce the pressure-resistant flat strength, there is a problem that other portions except for a portion that is easily bent must be strengthened.

  The present invention can reduce the length in the tube axis direction as these conventional techniques have, reduce the storage space by reducing the volume, and reduce the volume of the long tube for transportation. The pipe wall can be transported and the pipe wall to the ground can be enjoyed with the advantage of being able to bend the pipe along the topography. The entire cylinder wall can be made to have no partial weakened part.

  Furthermore, the present invention is a cylindrical body suitable for protecting a cable by inserting the cable into the inside, and a situation occurs in which the cylinder wall is worn and damaged by friction with the cable generated when the cable is inserted. This can be avoided by the structure of the tube itself.

  In other words, when the present invention is buried in the ground, it is a tube having a pressure-resistant deformation strength similar to the pressure-resistant deformation strength with respect to the earth pressure that a conventional synthetic resin tube for underground burying has, When transporting long pipes, the length of the pipes can be shortened to reduce the bulk and storage space, and long pipes can be transported. Underground pipe formation with a structure that makes it difficult for pipe wall to wear and break due to friction with the cable when inserting the cable into the cylinder, even though it is a cylinder that can bend piping according to the topography The object is to provide a tubular material.

  The structure of the present invention for achieving the object will be described using the reference numerals in the drawings corresponding to the embodiments. The structure of the underground pipe forming cylinder material according to claim 1 according to the present invention. Is a cylindrical member made of a synthetic resin in which the whole or at least a part of the cylindrical wall 1 is formed in a substantially unequal triangular shape in cross section, and the cylindrical wall 1 portion formed in the unequal triangular shape However, the left and right inclined walls 3 and 4 that follow the peak portion 2 are formed to be unequal in length, and the wall thickness T on the valley portion 5 side of one long side inclined wall 3 is the valley of the other short side inclined wall 4. It is formed thicker than the wall thickness t on the portion 5 side, and the long side inclined wall 3 and the short side inclined wall 4 are spaced apart from each other in a V-shaped sectional view, and the short side inclined wall 4 Is formed so as to be deformable into a superimposed posture folded on the long inclined wall 3 via a hinge portion 6 that is refractable. In the tube axis direction, it is formed by being displaced in the direction of the short-side inclined wall 4 from the position of the minimum diameter portion p in the long-side inclined wall 3 so that the separation posture and the superposition posture can be self-held. It is.

  Further, in the configuration of the underground pipe forming tube material according to claim 2 in the present invention, the intermediate portion 11 in the longitudinal direction of the tube wall 1 is formed in a substantially unequal triangular shape in cross section. A cylindrical material made of synthetic resin, in which the cylindrical wall 1 part formed in the unequal triangular shape has left and right inclined walls 3 and 4 that are continuous to the peak part 2 formed in a short and long unequal length, The wall thickness T on the valley portion 5 side of the long-side inclined wall 3 is formed to be thicker than the wall thickness t on the valley portion 5 side of the other short-side inclined wall 4, and these long-side inclined walls 3 and The short-side inclined wall 4 is separated from the separated posture opened in a V-shape in cross-section, and the superimposed posture folded on the long-side inclined wall 3 via the hinge portion 6 that allows the short-side inclined wall 4 to be bent. The hinge portion 6 is formed so as to be deformable, and in the tube axis direction, in the direction of the short-side inclined wall 4 relative to the position of the minimum diameter portion p in the long-side inclined wall 3. Position and are formed, and a superposing position and the spaced position is a structure capable of self-holding, the required length of the longitudinal ends, in which a structure formed in spiral irregularity waveform cylinder 12, 12.

  Further, in the configuration of the underground pipe forming cylindrical material according to claim 3, the intermediate portion 11 in the longitudinal direction of the cylindrical wall 1 is a synthetic resin cylindrical material in which the cross-sectional shape is formed in a substantially unequal triangular shape. The left and right inclined walls 3 and 4 following the mountain peak portion 2 are formed in a long and short unequal length in the cylindrical wall 1 portion formed in the unequal triangular shape, and one long side inclined wall 3 The wall thickness T on the valley portion 5 side is formed thicker than the wall thickness t on the valley portion 5 side of the other short-side inclined wall 4, and the long-side inclined wall 3 and the short-side inclined wall 4 Is formed in such a manner that it can be deformed into a separated posture opened in a V shape in sectional view and a superimposed posture folded on the long side inclined wall 3 via the hinge portion 6 in which the short side inclined wall 4 is refractable, The hinge portion 6 is formed by being displaced in the direction of the short side inclined wall 4 from the position of the minimum diameter portion p in the long side inclined wall 3 in the tube axis direction, The a spaced position and the superimposed position is a structure capable of self-holding, the required length of the longitudinal ends, in which a structure that is formed in an annular concavo-convex wave tube 13.

  Still further, in the configuration of the underground pipe forming tubular member according to claim 4, the intermediate portion 11 in the longitudinal direction of the tubular wall 1 is made of a synthetic resin tube in which the cross-sectional shape is formed in a substantially unequal triangular shape. The cylindrical wall 1 part which is a material and is formed in the unequal triangular shape is formed such that left and right inclined walls 3 and 4 following the peak part 2 are formed to be long and short unequal length, and one long side inclined wall 3 The wall thickness T on the valley portion 5 side is formed thicker than the wall thickness t on the valley portion 5 side of the other short side inclined wall 4, and the long side inclined wall 3 and the short side inclined wall 4 are formed. Are formed so as to be deformable into a separation posture opened in a V shape in a sectional view and a superimposed posture folded on the long-side inclined wall 3 via a hinge portion 6 in which the short-side inclined wall 4 is refractable. The hinge portion 6 is formed by being displaced in the direction of the short-side inclined wall 4 from the position of the minimum diameter portion p in the long-side inclined wall 3 in the tube axis direction. A superimposing position and the spaced position is a structure capable of self-holding, both end portions in the longitudinal direction, is obtained by a structure formed in the male joint tube 14 and the female joint tube 15.

  In carrying out the underground pipe forming tube material according to the present invention having the above-described configuration, as described in claim 5, the thickness of the peak portion 2 is set to be equal to that of the long inclined wall 3. It is preferable to implement as a structure formed thinner than the wall thickness of the short side inclined wall 4.

  In addition, as described in claim 6, it is also preferable that the shape of the peak portion 2 is implemented as a structure formed in an arc shape protruding toward the outer peripheral direction.

  Further, as described in claim 7, the thicknesses of the long-side inclined wall 3 and the short-side inclined wall 4 are formed so as to gradually increase in thickness from the peak portion 2 toward the valley portion 5. Can be implemented as

  Furthermore, as described in claim 8, the long side inclined wall 3 and the short side inclined wall 4 are shorter than the inclination angle of the long side inclined wall 3 in the separated posture having a V shape in cross section. It can also be implemented as a structure in which the inclined angle of the side inclined wall 4 is formed to be a steep angle.

  Furthermore, as described in claim 9, in the minimum diameter portion p of the long-side inclined wall 3 in the cylindrical wall 1 portion formed in an unequal triangular shape, the thickness is maximized. It can also be implemented as being.

  The resin material forming the cylindrical body referred to in the present invention is not particularly limited as long as it is a resin material having a required hardness. However, it has easy availability, low cost, and weather resistance, A polyolefin-based resin is preferable from the viewpoint of little deterioration.

  The underground pipe forming cylinder material referred to in the present invention is formed so that the length of the inclined wall portion having a substantially unequal triangular shape that forms the cylindrical wall is long and short unequal, and the valley portion of the long inclined wall The wall thickness T on the side is formed to be thicker than the wall thickness t on the valley portion side of the short inclined wall, and the position of the hinge portion that can be refracted is long in the tube axis direction. Since it has a structure that is displaced in the direction of the short side sloping wall from the position of the minimum diameter part p of the sloping wall, a long cable is inserted and wired in a pipe that is connected sequentially and piped over a long section Even in this case, the frictional friction with the insertion cable does not easily damage the small-diameter portion in the tube, and can safely protect the cable, and at the same time, the trough portion of the short inclined wall in the hinge portion. Since the wall thickness t can be reduced, refraction at the hinge is easy. Can, in turn, it is the effect came to be expected that the force that the pressure deformation of the entire tubular member to shrink posture can be reduced.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 to FIG. 5 are views showing the underground pipe forming tube material of the first embodiment of the present invention, FIG. 1 is a partially longitudinal sectional view of a tube wall in an expanded state, and FIG. FIG. 3 is an enlarged end view of the cylinder wall in the expanded state in FIG. 1, FIG. 4 is an enlarged end view of the cylinder wall in the reduced state in FIG. FIG. 4 is a diagram showing an example of a bending posture.

  The underground pipe forming cylinder material shown in the embodiment is an example of a synthetic resin material in which a tube is extruded from a die of a resin extruder having a cylindrical shape made of polypropylene resin into a moving mold, and air is blown into the tube. The resin tube is formed by using well-known blow molding means for expanding the tube and pressing it against the inner surface of the mold.

  As shown in FIGS. 1 and 3, the underground pipe forming cylinder material shown in the embodiment has a cross-sectional shape of the cylinder wall 1, as shown in the drawing, on the left and right sides following the peak portion 2 of the cylinder wall 1. It is a tubular body in which the lengths of the inclined walls 3 and 4 are formed in a long and short unequal triangular shape.

  Thus, the left and right inclined walls 3 and 4 are gradually thickened from the peak portion 2 side to the valley portion 5 side, and one long side inclined wall 3 is the other short side inclined wall. As shown in FIG. 3, the inclination angle α is loosened and the average wall thickness is increased, and the other short side inclined wall 4 is compared to the long side inclined wall 3 on one side. The inclination angle β is steep and the average wall thickness is reduced.

  Further, as shown in FIG. 3, the thickness T in the tube circumferential direction on the valley portion 5 side in the long sloping wall 3 on one side is set to the tube circumference on the valley portion 5 side in the other sloping wall 4 on the other side. The thin-walled portion t of the short-side inclined wall 4 is easily bent and deformed with respect to the thick-walled portion T of the long-side inclined wall 3. Further, the intersection of the long side inclined wall 3 and the short side inclined wall 4 on the outer peripheral surface side is a hinge portion 6, that is, both the inclined walls 3 and 4 are cross-sectional views V shown in FIGS. The hinge portion is adapted to be a bending fulcrum when the posture of the short inclined wall 4 is deformed from the separated posture opened in a letter shape to the superimposed posture in which the short inclined wall 4 approaches the outer peripheral surface side of the long inclined wall 3 and is folded. The position of 6 in the tube axis direction is a position slightly deviated in the direction of the short-side inclined wall 4 from the position of the minimum diameter portion p in the long-side inclined wall 3. Further, the wear resistance on the inner surface is improved to the maximum so that the wall thickness is maximized at the minimum diameter portion P.

  By doing in this way, it is easy to deform | transform into the attitude | position which the short side inclination wall 4 approaches the outer peripheral surface side of the long side inclination wall 3, and folds by using the hinge part 6 as a bending fulcrum. On the other hand, the short side inclined wall 4 can be easily deformed into a posture in which the short side inclined wall 4 is separated from the outer peripheral surface side of the long side inclined wall 3 and is changed to a separated posture opened in a V shape in sectional view.

  Further, the summit portion 2 where the long-side sloping wall 3 and the short-side sloping wall 4 intersect also has a thickness that is thinner than the average thickness of the two sloping walls 3 and 4, and the summit portion. The shape of 2 is formed in a semicircular arc shape. Also by this, the deformation transition to the approach posture of the short side inclined wall 4 and the long side inclined wall 3, and conversely, the short side inclined wall 4 is separated from the outer peripheral surface side of the long side inclined wall 3. Therefore, it is possible to make the transition to the separation posture opened in a V shape in cross section even easier.

  The underground pipe forming cylinder material shown in the embodiment is configured such that the entire cylinder wall 1 or a part of the cylinder wall 1 as shown in the following embodiment is divided into a long inclined wall 3 and a short inclined wall 4. Can be deformed into the separated posture and the superimposed posture, and the state, that is, the separated posture and the superimposed posture can be self-held unless external force such as compressive force or tensile force in the tube axis direction is applied. Since it was made like this, when it embeds in the ground and forms an underground conduit, a bending force is given to the cylinder wall 1 as needed. For example, as illustrated in FIG. 5, bent pipe is obtained by changing the other S of the cylindrical wall 1 to a contracted posture as shown in FIG. 2 while keeping one side B of the cylindrical wall 1 in the extended posture as shown in FIG. 1. It can be said that.

  FIGS. 6 to 8 show a second embodiment of the present invention. The cylindrical body shown in the embodiment has a required length 11A portion with the telescopic structure 11 shown in the first embodiment. The required length portions 12A and 12A at both ends of the cylindrical wall 1 in the longitudinal direction are formed integrally with spiral corrugated corrugated cylinders 12 and 12 that are generally seen.

  As a means for connecting the cylindrical body having such a structure to another pipe body, as shown in FIG. 7, other spiral pipes 22 and 22 formed in the same shape as the spiral concave and convex corrugated pipes 12 and 12 are provided. What is necessary is just to connect by the pipe joint which makes it abutting shape and connects these pipe-body parts 12 and 22. FIG.

  In FIG. 7, as an example of this pipe joint, means for connecting with tubular joints 21 and 21 having inner diameters for fitting these pipe body parts 12 and 22 are shown. Further, the tubular joint 21 shown in FIG. 7 is a joint in which a water-absorbing / expanding fiber f is attached to the inner surface of the tubular joint 21 so as to exhibit a water-stopping effect by volume expansion when water is absorbed. FIG. 8 shows a state in which the cylindrical body of the embodiment is connected in series between the two spiral tubes 22 and 22 using the joint 21.

  FIG. 9 shows a cylindrical body of the third embodiment, which is a spiral corrugated cylindrical body integrally connected to both left and right end portions of the cylindrical body shown in the second embodiment. The water-absorbing / expanding fiber f similar to the water-absorbing / expanding fiber f that is affixed to the inner surface of the tubular joint 21 shown in the description of the second embodiment is attached in advance to the outer peripheral surfaces of 12 and 12. Is. Such a structure may be implemented.

  The cylinder shown in FIG. 10 is the cylinder of the fourth embodiment, and the cylinder has a required length portion 13A at both ends in the longitudinal direction of the cylinder wall 1 having a telescopic structure formed at a required length 11A. , 13A have a structure formed integrally with a generally known annular concave and convex corrugated tube 13, 13. The present invention can also be implemented in this way.

  FIGS. 11 to 13 show a fifth embodiment of the present invention. The cylindrical body shown in the embodiment shows a required length 11A portion in the first and second embodiments. A male joint cylinder 14 is integrally connected to one end (left side in the figure) 14A at both ends in the longitudinal direction of the cylindrical wall 1 that is the stretchable structure 11, and the female joint is connected to the other 15A. This is an embodiment of a cylinder having a structure in which the cylinder 15 is integrally connected.

  The male side joint cylinder 14 shown in this embodiment has a cross-sectional shape that is horizontally oriented between two ring-shaped projecting ribs r, r that are formed to project from the outer periphery of the insertion cylinder i for insertion into another female side joint cylinder. It is assumed that a V-shaped waterstop packing P is externally fitted, and the other female-side joint tube 15 is annular and partially inside the receiving tube j having an inner diameter for receiving another male-side joint tube. An engagement ring R that is cut and formed into a C-shape is internally fitted.

  As a means for connecting the tubular body having such a structure to another tubular body, as shown in FIG. 12, a female-side joint cylinder having the same shape as the female-side joint cylinder 15 on one end side (terminal side) is provided. The male side joint cylinder 15 is inserted and connected to the tube body 25 provided with 25A, and another male side joint cylinder 24A having the same shape as the male side joint cylinder 14 is provided on one end side (front end side). The tube body 24 is inserted into and connected to the female side joint tube 15. In this way, as shown in FIG. 13, it can be used by interposing it between the two left and right tube bodies 25, 24. The cylinder shown in the fifth embodiment has a male joint cylinder 14 shown on the left side and a female joint cylinder 15 shown on the right side in FIG. In addition to the expansion / contraction adjustment of the telescopic part, if necessary, use two or three of the same cylinders to adjust the length of the connecting pipes 25, 24. It is made to be able to.

  Although the embodiment considered to be representative of the present invention has been described above, the present invention is not necessarily limited only to the cylindrical body of the embodiment structure described herein, and includes the above-described configuration requirements according to the present invention, The object of the present invention can be achieved and can be implemented with appropriate modifications within the scope of the above effects.

  As described above, the underground pipe-forming cylinder material according to the present invention is stored and transported in a low-volume state, and at the piping site, it is stretched like a normal pipe and conforms to the terrain. It is possible to easily expand and contract while being able to form a flexible pipe line, and when inserting the cable into the cylinder, it is safe to protect the cable by bearing the friction due to the friction of the cable at the thick part inside the cylinder It is expected to become very popular after being supplied to the market.

The partial longitudinal cross-sectional front view which showed the expansion | extension state of the cylinder of 1st Example. The partial longitudinal section front view showing the contraction state of the cylinder. FIG. 2 is an enlarged end view of a vertical wall portion in FIG. 1. FIG. 3 is an enlarged end view of a vertical wall portion in FIG. 2. The illustration figure which shows a bending state. The longitudinal front view which shows the cylinder of 2nd Example. FIG. 4 is an exploded vertical front view for explaining connection between the cylindrical body and another tubular body. The longitudinal cross-sectional front view which shows the connection state of the cylinder and another tubular body. The longitudinal front view which shows the cylinder of 3rd Example. The longitudinal cross-sectional front view which shows the cylinder of 4th Example. The longitudinal section front view showing the cylinder of the 5th example. FIG. 4 is an exploded vertical front view for explaining connection between the cylindrical body and another tubular body. The longitudinal cross-sectional front view which shows the connection state of the cylinder and another tubular body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder wall 2 Peak part 3 Long side inclination wall 4 Short side inclination wall 5 Valley part 6 Hinge part 11 Middle part 12 Spiral uneven corrugated cylinder 13 Annular uneven corrugated cylinder 14 Male side joint cylinder 15 Female side joint cylinder

Claims (9)

  The whole or at least a part of the cylindrical wall (1) is a cylindrical member made of synthetic resin whose cross-sectional shape is formed in a substantially unequal triangular shape, and the cylindrical wall (1 ) Part, the left and right inclined walls (3), (4) that follow the peak part (2) are formed to be long and short unequal length, and the meat on the valley part (5) side of one long side inclined wall (3) The thickness (T) is thicker than the wall thickness (t) on the valley part (5) side of the other short side inclined wall (4), and these long side inclined wall (3) and the short side are formed. The sloping wall (4) is separated from the long sloping wall (3) via the separated posture that is open in a V shape in cross section and the hinge portion (6) that allows the short sloping wall (4) to be bent. The hinge portion (6) is formed so as to be able to be deformed into a folded superposition posture, and in the tube axis direction, the shorter side inclined wall (4) than the position of the smallest diameter portion (p) in the longer side inclined wall (3) ), And a structure capable of self-holding the separated posture and the superimposed posture. Underground pipe forming cylinder material.   The intermediate portion (11) in the longitudinal direction of the cylindrical wall (1) is a cylindrical member made of synthetic resin having a cross-sectional shape formed in a substantially unequal triangular shape, and the cylindrical shape is formed in the unequal triangular shape. Left and right inclined walls (3) and (4) are formed in a long and short unequal length, with the wall (1) portion following the peak portion (2), and the valley portion (5) of one long side inclined wall (3) The wall thickness (T) on the side is formed thicker than the wall thickness (t) on the valley portion (5) side of the other short side inclined wall (4), and these long side inclined walls (3) And the short side inclined wall (4) are separated from each other in a V-shaped cross sectional view and the long side inclined wall (3) via the hinge part (6) in which the short side inclined wall (4) is refractable. The hinge portion (6) is formed so as to be deformable into a superposed posture folded on the top, and the hinge portion (6) is inclined on the short side with respect to the position of the minimum diameter portion (p) on the long side inclined wall (3) in the tube axis direction. It is formed by being displaced in the direction of the wall (4), and has a structure capable of self-holding the separation posture and the superposition posture, Required length of the longitudinal direction at both ends, the helical irregularity waveform cylinder (12), the ground line formed tubular member formed in (12).   The intermediate portion (11) in the longitudinal direction of the cylindrical wall (1) is a cylindrical member made of synthetic resin having a cross-sectional shape formed in a substantially unequal triangular shape, and the cylindrical shape is formed in the unequal triangular shape. Left and right inclined walls (3) and (4) are formed in a long and short unequal length, with the wall (1) portion following the peak portion (2), and the valley portion (5) of one long side inclined wall (3) The wall thickness (T) on the side is formed thicker than the wall thickness (t) on the valley portion (5) side of the other short side inclined wall (4), and these long side inclined walls (3) And the short side inclined wall (4) are separated from each other in a V-shaped cross sectional view and the long side inclined wall (3) via the hinge part (6) in which the short side inclined wall (4) is refractable. The hinge portion (6) is formed so as to be deformable into a superposed posture folded on the top, and the hinge portion (6) is inclined on the short side with respect to the position of the minimum diameter portion (p) on the long side inclined wall (3) in the tube axis direction. It is formed by being displaced in the direction of the wall (4), and has a structure capable of self-holding the separation posture and the superposition posture, Required length of the longitudinal direction at both ends, cyclic irregularities waveform cylinder (13), the ground line formed tubular member formed in (13).   The intermediate portion (11) in the longitudinal direction of the cylindrical wall (1) is a cylindrical member made of synthetic resin having a cross-sectional shape formed in a substantially unequal triangular shape, and the cylindrical shape is formed in the unequal triangular shape. Left and right inclined walls (3) and (4) are formed in a long and short unequal length, with the wall (1) portion following the peak portion (2), and the valley portion (5) of one long side inclined wall (3) The wall thickness (T) on the side is formed thicker than the wall thickness (t) on the valley portion (5) side of the other short side inclined wall (4), and these long side inclined walls (3) And the short side inclined wall (4) are separated from each other in a V-shaped cross sectional view and the long side inclined wall (3) via the hinge part (6) in which the short side inclined wall (4) is refractable. The hinge portion (6) is formed so as to be deformable into a superposed posture folded on the top, and the hinge portion (6) is inclined on the short side with respect to the position of the minimum diameter portion (p) on the long side inclined wall (3) in the tube axis direction. It is formed by being displaced in the direction of the wall (4), and has a structure capable of self-holding the separation posture and the superposition posture, Both end portions of the side direction, the male-side fitting tube (14) and the underground pipe forming tubular member that is formed on the female coupling tube (15).   The thickness of the crest portion (2) in the cylindrical wall (1) formed in an unequal triangular shape is thinner than the thickness of the long side inclined wall (3) and the short side inclined wall (4). The underground pipe forming cylinder material according to any one of claims 1 to 4.   The ground according to any one of claims 1 to 5, wherein the shape of the peak portion (2) in the cylindrical wall (1) portion formed in an unequal triangular shape is formed in an arc shape projecting toward the outer peripheral direction. Medium pipe forming cylinder material.   The wall thickness of the long side inclined wall (3) and the short side inclined wall (4) in the cylindrical wall (1) formed in an unequal triangular shape is from the peak (2) to the valley (5). The underground pipe forming cylinder material according to any one of claims 1 to 6, which is formed into a shape that gradually becomes thick.   When the long side inclined wall (3) and the short side inclined wall (4) in the cylindrical wall (1) formed in an unequal triangular shape are separated from each other in a V-shaped separated posture, the long side inclined wall (3 The underground pipe-forming tube material according to any one of claims 1 to 7, wherein the short-side inclined wall (4) is formed so that the inclination angle thereof is steeper than the inclination angle.   9. The structure according to claim 1, wherein the cylindrical wall (1) formed in an unequal triangular shape has a structure in which the wall thickness is maximized at the minimum diameter portion (p) of the long inclined wall (3). The underground pipe forming cylinder material according to any one of the above.

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