JP2006322491A - Synthetic resin pipe body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin pipe body having resistance to vertical bending pressure on a pipe wall having a certain distance from the pipe end to be connected and fixed in piping attitude while maintaining flexibility in most part. <P>SOLUTION: The pipe body P has the pipe wall 1 formed in an irregular shape with protruded portions 2 and recessed portions 3 alternately arranged along the pipe axial direction. One or both of the outer peripheries of the recessed portions 3, 3 at a required pitch from the pipe end, vertically positioned in piping attitude, ribs 4, 4 are formed ranging from the longitudinal side wall faces 2a, 2a of the adjacent protruded portions 2, 2. Otherwise, one or both of the outer peripheries of the protruded portions 2, 2 at a required pitch from the pipe end, vertically positioned in piping attitude, cavity portions 5, 5 are formed ranging all over the width of the protruded portion 2 in the pipe axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a synthetic resin tubular body for protecting a cable, such as an electric wire, a telephone line, and an optical cable, which is mainly inserted and accommodated in the ground. The present invention relates to a synthetic resin tubular body used by connecting to a side wall of a handhole or manhole installed as a relay point.

  As such a synthetic resin tube body, conventionally, convex portions with a large cross-sectional area and concave portions with a small cross-sectional area are alternately arranged, and the tube wall is formed into an annular undulated wave shape along the tube axis. In general, the configuration of the tube wall is, for example, a tube with a convex section having a square cross section and a concave section having a circular cross section, and a pipe body having both a convex portion and a concave section having a circular cross section. In addition, there is a tubular body in which both the convex portion and the concave portion have a rectangular cross section. In addition, a configuration in which the tube wall is formed in a spiral uneven wave shape along the tube axis is also widely known.

  Regardless of whether these pipes are annular or spiral, the pipe wall has a structure with an uneven wave shape along the pipe axis, so it has excellent flexibility. It has the advantage that bending piping is easy, piping along the topography, and avoiding obstacles.

And when laying such a pipe in the ground and forming a pipeline, handholes and manholes are installed as cable relay points at appropriate intervals of the pipeline, and the following explanation is given by taking a handhole as an example. Then, a bell mouth is attached to the pipe connection hole formed in the side wall of the hand hole, and the tube end of the tube is inserted directly or through a joint, or the tube end of the tube inserted into the pipe connection hole from the outside of the hand hole. For example, a bell mouth is fitted from the inside of the hand hole to connect and connect the tubular body to the hand hole. (JP 2000-146068 A, JP 2000-257755 A)
JP 2000-146068 A JP 2000-257755 A

  However, when pipes are connected in multi-layered state and connected to a hand hole, a gap is formed between the pipes in the upper and lower positions in the vicinity of the pipe end that is the connection part. In the conventional tube body, the entire tube body is flexible. However, the tube body bends up and down due to its own weight, increasing the cable insertion resistance, making it difficult to insert the cable. I had the problem of becoming.

  In addition, when the ground at the place where the handhole is installed is soft ground, the entire handhole may sink due to ground subsidence. In the conventional tubular body, the entire tubular body is flexible like the former. For the reason, the pipe end connected to the bell mouth of the handhole sinks together with the handhole, so that the pipe laid in the ground bends in the vertical direction, especially the pipe fixedly connected to the handhole. In the vicinity of the edge, there was a problem that neck breakage might occur.

  Therefore, the present invention aims to solve the problems of such a conventional synthetic resin pipe body, and is connected and fixed in a piping posture while maintaining flexibility in most of the pipe body. It is intended to provide a synthetic resin pipe body having resistance against bending pressure in the vertical direction on a pipe wall at a certain distance from the pipe end.

  The configuration of the present invention taken to solve this problem will be described with reference to the reference numerals used in the drawings showing the embodiments. The first configuration of the present invention is that the tube wall 1 protrudes along the tube axis direction. It is the pipe body P which the part 2 and the recessed part 3 are alternately arrange | positioned, and is formed in the uneven | corrugated wave shape, Comprising: Of the outer periphery of the recessed part 3, 3 ... for a required pitch from a pipe end, the vertical position in piping attitude | position The ribs 4, 4... That are continuous with the side wall surfaces 2a, 2a in the front-rear direction of the adjacent convex portions 2, 2 are formed on either one or both.

  Further, the second configuration of the present invention is a tubular body P in which the tube wall 1 is formed in a concavo-convex wave shape by alternately arranging the convex portions 2 and the concave portions 3 along the tube axis direction, Recesses 5, 5,... Are formed over the entire width of the protrusion 2 in the tube axis direction at one or both of the upper and lower positions in the piping posture of the outer periphery of the protrusions 2, 2,. It is set as the structure made.

  According to the first configuration of the present invention, one or both of the upper and lower positions in the piping posture of the outer periphery of the concave portion corresponding to the required pitch from the pipe end is continuous with respect to the side wall surface in the front-rear direction of the adjacent convex portion. Since the rib is formed, the pipe wall for the required pitch is removed from the end of the tube where the connection part to the manhole or hand hole is formed, and it is flexible and free like a conventional tube. In the pipe wall for the required pitch from the pipe end, there is a rib that is continuous with respect to the side wall surface in the front-rear direction of the adjacent convex portion at the vertical position in the pipe posture. , The pipe wall in the vertical position is prevented from contracting and stretching against the bending pressure in the vertical direction of the tube, and the bending deformation in the vertical direction of the tube is suppressed, which causes the tube's own weight and ground subsidence. A situation where it bends up and down Be avoided, it is possible to stably maintain the pipe state in the ground, it is possible to perform the insertion operation of the cable into the tube body without any trouble smoothly.

  Further, according to the second configuration of the present invention, the entire width of the convex portion in the tube axis direction is provided at one or both of the upper and lower positions in the piping posture of the outer periphery of the convex portion corresponding to the required pitch from the pipe end. Since it has a recessed part, it is flexible and free like a conventional pipe except the pipe wall for the required pitch from the pipe end where the connection part to the manhole or hand hole is formed. In the pipe wall for the required pitch from the pipe end, the recessed part over the entire width in the pipe axis direction of the convex part in the pipe posture is located on the pipe wall. The pipe wall in the vertical position is prevented from contracting and stretching against the bending pressure in the vertical direction, and the bending deformation in the vertical direction of the pipe is suppressed. The situation where it bends is avoided, and piping in the ground It is possible to maintain state stably, it is possible to perform the insertion operation of the cable into the tube body without any trouble smoothly.

  Further, in the production of the pipe body of the present invention, it is only necessary to change the mold corresponding to the required pitch from the pipe end to the pipe back side among the molds of the molding machine used conventionally. It can be implemented at a cost and is very economical.

  In carrying out the first configuration of the present invention, the ribs 4, 4... Are subjected to a bending pressure in the vertical direction of the tubular body when implemented with a configuration in which the protrusions 2, 2. It can have the greatest resistance to it. Further, when the ribs 4, 4... Are formed so that the projecting width and / or the projecting height are gradually reduced toward the inner side of the pipe, bending of the pipe body is prevented on the pipe end side. However, since the flexibility gradually increases toward the back side of the pipe, the bent pipe can be smoothly formed on the back side of the pipe. In this latter embodiment, the projecting width and / or projecting height of the ribs 4, 4... Are formed so as to decrease step by step for each rib 4, 4. However, the ribs 4, 4... May be configured such that the projecting width and / or the projecting height of the ribs 4, 4 are gradually reduced toward the back of the tube.

  Further, the ribs 4, 4... Are formed on the outer periphery of the recesses 3, 3... Corresponding to the required pitch from the pipe end, and are formed at one or both of the vertical positions in the piping posture. Means the distance from the pipe end within the range having the above-mentioned effects, and is not limited to a specific value. The vertical position means the left and right sides of the outer periphery of the recesses 3, 3,. It means a position within the range of the approximate upper part and the approximate lower part excluding the part, and is not limited to a specific narrow part. However, it is preferable to form it so that it is located at one or both of the top 3a of the recesses 3, 3,... And the bottom 3b symmetrical to it in the piping posture, and against the bending pressure in the vertical direction of the pipe body. The most resistant.

  In addition, the number of ribs 4 formed in one recess 3 is arbitrary, but the plurality of recesses 3, 3... Are similarly given the greatest resistance to bending pressure in the vertical direction of the tubular body. The ribs 4, 4... May be implemented with a configuration arranged along the tube axis direction or a configuration extending along the tube axis direction.

  In implementing the second configuration of the present invention, when the recessed portions 5, 5... Are formed with substantially the same depth as the recessed portions 3, 3,. The most resistant. In addition, when the concave portions 5, 5... Are formed so that the concave depth gradually decreases toward the inner side of the pipe, the pipe ends are prevented from being bent at the pipe end side. Since the flexibility gradually increases toward the back side, bending piping can be made more smoothly on the back side of the pipe. In this latter embodiment, the recesses 5, 5... Have a recess depth that decreases step by step for each recess 5, 5. The structure formed so that the recessed depth of insertion part 5,5 ... may become small gradually toward a pipe | tube back side may be sufficient.

  In addition, the recessed portions 5, 5... Are the outer periphery of the convex portions 2, 2... Corresponding to the required pitch from the pipe end, and are formed at either one or both of the vertical positions in the piping posture. The pitch portion refers to the distance from the pipe end within the range having the above-mentioned effects, and is not limited to a specific value, and the vertical position is the outer periphery of the convex portions 2, 2,. It means a position within the range of the approximate upper part and the approximate lower part, excluding the left and right sides, and is not limited to a specific narrow spot. However, preferably, it should be formed so as to be located at one or both of the top part of the convex parts 2, 2... And the bottom part symmetrical to it in the piping posture, against the bending pressure in the vertical direction of the pipe body. It can have the greatest resistance.

  Although common to the first configuration and the second configuration of the present invention, the tube wall is formed in an uneven wave shape by alternately arranging the convex portions 2 and the concave portions 3 along the tube axis direction. The shape of 1 is such that the convex portion 2 has a square cross section, the concave portion 3 has a circular cross section, the convex portion 2 and the concave portion 3 both have a circular cross section, and the convex portion 2 and the concave portion 3 both have a square cross section. Can be implemented as an annular corrugated tube, or can be implemented as a spiral corrugated tube, and is not limited, but the convex portion 2 has a square cross section and the concave portion 3 has a circular cross section. When the shape or the convex part 2 and the concave part 3 are formed in a cross-sectional square shape, the pipe body P does not rotate in the ground, and the piping posture can be maintained. The position of the ribs 4, 4... Or the recessed portions 5, 5. Preferable in that it is Rukoto.

  Embodiments of the present invention will be described below together with illustrated examples. 1 to 7 show a synthetic resin pipe body according to a first embodiment of the present invention. FIG. 1 is a partial perspective view of the front end side of the pipe body P, and FIG. 3 is a vertical sectional view of the upper half of the tube P, FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, FIG. 5 is a perspective view of the bell mouth body M and the ring R, and FIG. Is an upper half longitudinal sectional view showing a state before connection of the tube P, and FIG. 7 is an upper half longitudinal sectional view showing a connection state of the tube P.

  The structure of the synthetic resin pipe body P of the first embodiment is such that the shape of the tube wall 1 is an annular corrugated wave shape in the tube axis direction, and a convex portion 2 having a large cross-sectional area and a concave portion 3 having a small cross-sectional area. Are arranged alternately and sequentially along the tube axis direction. More specifically, the convex part 2 of the corrugated corrugation has a square shape with a rounded corner, and includes both side walls 2a, 2a and a peripheral surface 2b, and the concave part 3 has a circular sectional shape. ing.

  As shown in FIG. 1 and FIG. 3, the tube body P has an inclined tube 11 having a larger diameter on the back side than the end surface side, and a rear side of the tube portion P having a small diameter as shown in FIGS. 14 is formed, and the rear surface of the inclined cylinder 11 is formed in a locking step portion 12 that engages with a locking step portion 32 of the ring R described later. Further, on the rear side of the inclined cylinder 11, convex portions 13 are respectively formed at circumferential positions corresponding to notches 33 of the ring R described later. Further, on the rear side of the small-diameter cylindrical portion 14, a watertight rubber ring 15 provided with an inclined outer circumferential surface having a larger diameter toward the rear side in an annular groove 16 formed between the front and rear annular ribs. The outer diameter of the bell mouth main body M is set to be in pressure contact with the inner peripheral surface of the opening guide tube 41 and the inner peripheral surface of the opening guide tube 21 at the rear end of the tube P.

  When the pipe body P is in the piping posture connected to the bell mouth attached to the hand hole, the vertical positions of the concave and convex portions 3, 3. In other words, in this embodiment, as shown in FIG. 4, adjacent convex portions 2 are located at two positions of the top portion 3a of the concave portions 3, 3. The rectangular ribs 4, 4,... Extending in the axial direction directly and continuously from the two front and rear side wall surfaces 2a, 2a are disposed along the axial direction. In addition, the ribs 4, 4... Project outward in the radial direction, and all the ribs 4, 4. It has a width and the same protruding height as that of the convex portions 2, 2.

  As shown in FIGS. 2 and 3, the rear end portion of the tube body P is formed with an opening guide tube 21 for receiving the tip portion of another tube body P at the open end thereof, and at the back portion thereof, a tube shaft An outward projection 24 is formed on a part of the circumferential direction of the large-diameter cylindrical portion 22 having a larger diameter than the front and rear walls 22a and 22b.

  In manufacturing the tubular body P having such a structure, the molten resin is extruded into a tube form from a resin extruder disposed at one end of the continuous forming mold in a known caterpillar-type tubular body forming machine. By blowing high-pressure air into the inside or by simultaneously sucking air from the forming die, the tubular body P is successively formed while pressing the molten tube against the forming die.

  As shown in FIG. 2, the engagement ring R formed separately is a non-annular shape having a substantially C-shaped side view, and has an inner diameter on one end surface 31a side (left side in FIG. 2) in the width direction. A guide inclined surface 31 having a large diameter and a small diameter on the back side is formed to be approximately a half width of the width of the ring R, and a locking step portion that engages with the locking step portion 12 on the back side. 32 is formed. Further, notches 33 are formed at three locations in the circumferential direction by notching the inclined surface 31, and inclined surfaces 33a that are inclined in the circumferential direction are formed on both sides of the notched portions 33, respectively. is there. Further, a projection 34 protruding outward is formed on the outer peripheral surface of the ring R.

  Thus, the engagement ring R is arranged so that the end surface 31a on the large diameter side of the guide inclined surface 31 is located on the inlet side in the inside 23 of the large diameter cylindrical portion 22 in the tube P, and An outwardly protruding protrusion 34 of R is inserted so as to fit into a recess on the inner surface of the outward protrusion 24 formed on the large diameter cylindrical portion 22.

  FIG. 5 shows a bell mouth main body M for connecting the distal end portion of the tube body P. The bell mouth main body M is generally cylindrical, and one opening portion, the right opening portion 46 in FIGS. The trumpet-shaped portion and the length L of the cylindrical portion 45 following the trumpet-shaped portion are formed to a length corresponding to the thickness of the concrete wall C in the hand hole. The other opening, that is, the left opening 46 in FIGS. 5 to 7 has the same structure as the rear end of the tube P, and the guide tube 41 that receives the tip of another tube P at the open end. Is formed on the inner side of the large-diameter cylindrical portion 42 having a larger diameter than the front and rear walls 42a and 42b in the tube axis direction. A protrusion 44 is formed. Thus, the same engagement ring R as that to be inserted into the rear end portion of the tube body P is connected to the inside 43 of the large diameter cylindrical portion 42 of the bell mouth main body M, and the end surface 31a on the large diameter side of the guide inclined surface 31 is provided. It is inserted so that the outwardly protruding protrusion 34 of the ring R is positioned on the inlet side and is fitted to the recess on the inner surface of the outwardly protruding protrusion 44 formed on the large diameter cylindrical portion 42. is there.

  As shown in FIG. 6, the bell mouth main body M having such a structure has a trumpet-shaped opening 46 that coincides with the inner surface of the hand hole when the hand hole is formed. A part is embedded in the concrete wall C so as to protrude from the outer surface of the handhole. In this way, the bell mouth main body M forms an opening that communicates with the inside and outside of the concrete wall C of the handhole.

  In order to connect the above-described tube P to the bell mouth body M, as shown in FIG. 6, with the ribs 4, 4... It is only necessary to push the end toward the guide tube 41 of the bell mouth main body M. Alternatively, although not related to the present embodiment, if the embodiment has a degree of freedom to rotate the tubular body P at the connection portion with the bell mouth body M, the opening end of the tubular body P is guided to the bell mouth body M. After pushing in toward the tube 41, the piping posture may be adjusted by rotating the tube P so that the ribs 4, 4.

  In any case, when the open end of the tube P is pushed toward the guide tube 41 of the bell mouth main body M, the inclined tube 11 at the tip of the tube P comes into contact with the guide inclined surface 31 of the ring R. It moves to the inner part while spreading in the circumferential direction, and the spreading force in the circumferential direction disappears at the point where the locking step 12 passes through the guide inclined surface 31, and the snapping sound is generated by the disappearance of this spreading force. Then, the ring R is restored in the small diameter direction, and the end of the pushing operation of the pipe P is notified by sound. By the restoration of the ring R in the small diameter direction, the locking step portion 12 of the pipe body P and the locking step portion 32 on the back side of the guide inclined surface 31 of the ring R are engaged, and the pipe body P moves in the withdrawal direction. To prevent. At this time, the plurality of protrusions 13 of the pipe body P are fitted with the plurality of notches 33 of the ring R to restrict the pipe body P from being easily moved in the circumferential direction. The ribs 4, 4... At the upper and lower positions of the recesses 3, 3... 5 pitches from the pipe end of the pipe body P in the piping posture are large when a bending action occurs due to vertical bending pressure. The expansion of the pipe wall 1 on the diameter side and the contraction of the pipe wall 1 on the small diameter side are both restricted, and the bending of the pipe wall 1 in the vertical direction by 5 pitches from the pipe end is suppressed.

  FIGS. 8 and 9 show the synthetic resin pipe body of the second embodiment of the present application. The difference from the first embodiment is that the rectangular ribs 4 formed in the concave portion 3 on the most distal end side are adjacent to each other. In the state where it is directly continuous with the side wall surfaces 2a, 2a in the front-rear direction of the convex portions 2, 2, and is also continuous with the peripheral surface 2b on a flat surface, it is formed with the same protruding height as the convex portions 2, 2,. From there, the ribs 4, 4... Project outward in the radial direction toward the inner side of the pipe, and the height of each rib 4, 4,. The flexibility is gradually increased toward the back side of the pipe so that a smooth bent pipe can be formed on the back side of the pipe.

  10 and 11 show a synthetic resin pipe body according to the third embodiment of the present invention. The difference from the first embodiment is that the ribs 4, 4,... Have a semicircular arc-shaped round rib shape. , Rib 4, 4... Where the most distal end side and convex portion 2 are continuous is the portion having the maximum projecting width and the maximum projecting height in the radially outward direction. , 4..., And the projecting height outward in the radial direction are gradually reduced. Similar to the second embodiment, the flexibility is gradually increased toward the back side of the pipe so that a smooth bent pipe can be formed on the back side of the pipe.

  FIGS. 12 to 14 show a synthetic resin pipe body according to the fourth embodiment of the present invention. The difference from the first embodiment is that the ribs 4, 4... Are bell mouths in which the pipe body P is attached to the handhole. When the piping posture is connected to the pipe body P, two pipes are formed at the upper and lower positions of the recesses 3, 3. More specifically, in the piping posture, two ribs 4 and 4 are protruded upward from a position slightly shifted in the left-right circumferential direction from the top 3a of the recess 3 having a circular cross section, and the bottom is located symmetrically with the top 3a. Two ribs 4, 4 are projected downward from a position slightly shifted in the left-right circumferential direction from 3 b, are directly continuous with the side wall surfaces 2 a, 2 a of the adjacent convex portions 2, 2, and both the circumferential surface 2 b In a state of being continuous on a flat surface, all the ribs 4, 4... Are formed with the same projecting width and the same projecting height as the projecting portions 2, 2.

  15 and 16 show a synthetic resin pipe body according to the fifth embodiment of the present invention, and the recesses 3, 3... 5 pitches from the distal end portion of the pipe body P as in the first to fourth embodiments. Rather than forming the ribs 4, 4..., The upper and lower surfaces of the outer peripheral surfaces of the convex portions 2, 2. In the central position, recessed portions 5, 5... Are formed directly across the both side wall surfaces 2a, 2a over the entire width of the protruding portion 2 in the tube axis direction, and with substantially the same recessed depth as the recessed portion 3. The concave surface of the concave portion 5 over the entire width of the convex portion 2 in the tube axis direction is constituted by the convex portions 2, 2,... And the concave portions 3, 3,. By restricting the action of the upper and lower portions of the pipe wall 1 extending or contracting, the bending deformation of the pipe body P in the vertical direction is suppressed.

  FIGS. 17 and 18 are synthetic resin pipe bodies according to the sixth embodiment of the present application, and the difference from the fifth embodiment is that the recessed portion 5 formed on the convex portion 2 on the most distal end side is a convex portion. 2 is formed directly on both side wall surfaces 2a, 2a over the entire width in the tube axis direction 2 and with the same recess depth as that of the recess 3, and the diameter of the recesses 5, 5,. The depth of indentation inward in the direction is that it is formed to be small step by step for each of the recessed portions 5, 5. The flexibility is gradually increased toward the back side of the pipe so that a smooth bent pipe can be formed on the back side of the pipe.

  19 to 21 show a synthetic resin pipe body according to the seventh embodiment of the present invention, and when the pipe is in the piping posture, the convex parts 2, 2... Of the outer peripheral surface of the concave portion 5 at the center of the upper and lower sides of the convex portion 2 over the entire width of the convex portion 2 in the tube axis direction, directly with the side wall surfaces 2a, 2a and with the same concave depth as the concave portion 3. 5 is formed, and in addition to this, 2 upward or downward from a position slightly displaced in the left-right circumferential direction from the top 3a and bottom 3b of the recesses 3, 3. In a state where the ribs 4, 4 are directly continuous with the side wall surfaces 2 a, 2 a of the adjacent projections 2, 2 and are also continuous with the flat surface of the peripheral surface 2 b, all the ribs 4, 4. It has the same projecting width and the same projecting height as the projecting portions 2, 2.

  22 to 24 are synthetic resin pipe bodies according to the eighth embodiment of the present application, and when the pipe is in a piping posture, the top part 3a of the recesses 3, 3. The rectangular ribs 4, 4,... Extending directly in the axial direction from the side walls 2a, 2a in the front-rear direction of the adjacent convex portions 2, 2 and continuously from the flat surface of the peripheral surface 2b, respectively. The same protrusion width and the same protrusion height as the protrusions 2, 2... Are formed along the axial direction. 2, 2... At the center position of the lower surface of the outer peripheral surface of 2, 2,... Directly on the side wall surfaces 2a and 2a over the entire width in the tube axis direction of the convex portion 2 and with the same depth of recess as the concave portion 3. The recesses 5, 5... Are formed.

  The synthetic resin tubular bodies of the seventh and eighth embodiments are examples of the combination of the first configuration and the second configuration of the present invention, and various other combinations are also possible. Can be implemented.

  Although the embodiment considered to be a representative example of the present invention has been described above, the present invention is not limited only to the above-described embodiment, and includes the above-described configuration requirements according to the present invention and refers to the present invention. The present invention can be carried out with appropriate modifications within the scope of achieving the object and having the effects referred to in the present invention.

  The synthetic resin pipe body of the present invention is an improved product that suppresses the bending of the uneven corrugated structure for the required pitch from the pipe end and prevents bending at the pipe connection part, and is supplied to the market instead of the conventional product Is going to be.

The partial perspective view of the front end side of the pipe body P of 1st Example. FIG. 3 is a perspective view of a part of the rear end side of the tube P and a ring R. The upper half longitudinal section of the same pipe P. FIG. AA sectional view taken on the line in FIG. The perspective view of the bell mouth and ring R. FIG. The upper half longitudinal section which shows the state before the connection of the same tubular body P. FIG. The upper half longitudinal section which shows the connection state of the same tubular body P. FIG. The partial perspective view of the front end side of the pipe body P of 2nd Example. The upper half longitudinal section of the same pipe P. FIG. The partial perspective view of the front end side of the pipe body P of 3rd Example. The upper half longitudinal section of the same pipe P. FIG. The partial perspective view of the front end side of the pipe body P of 4th Example. The upper half longitudinal section of the same pipe P. FIG. BB sectional drawing in FIG. The partial perspective view of the front end side of the pipe P of 5th Example. The upper half longitudinal section of the same pipe P. FIG. The partial perspective view of the front end side of the pipe body P of 6th Example. The upper half longitudinal section of the same pipe P. FIG. The partial perspective view of the front end side of the pipe P of 7th Example. The upper half longitudinal section of the same pipe P. FIG. The CC sectional view taken on the line in FIG. The partial perspective view of the front end side of the pipe body P of 8th Example. The partial longitudinal cross-sectional view of the same tubular body P. DD sectional view taken on the line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube wall 2 Convex part 2a Side wall surface 3 Concave part 4 Rib 5 Concave part M Bellmouth P Pipe body R Ring

Claims (5)

  The tube wall 1 is a tubular body P in which convex portions 2 and concave portions 3 are alternately arranged along the tube axis direction to form a corrugated wave shape, and the concave portions 3 and 3 corresponding to a required pitch from the pipe end. ... Are formed on one or both of the upper and lower positions in the piping posture of the outer periphery of..., Continuous ribs 4, 4. Resin tube.   2. The synthetic resin tubular body according to claim 1, wherein the ribs 4, 4... Are formed such that a projecting width and / or a projecting height are sequentially reduced toward the inner side of the pipe.   The said rib 4,4 ... is a synthetic resin pipe body of Claim 1 or 2 arrange | positioned along the pipe-axis direction.   The tube wall 1 is a tubular body P in which convex portions 2 and concave portions 3 are alternately arranged along the tube axis direction to form a corrugated wave shape. 2... A synthetic resin pipe body in which recessed portions 5, 5... Are formed in one or both of the upper and lower positions in the piping posture of the outer periphery of 2.   5. The synthetic resin pipe body according to claim 4, wherein the recessed portions 5, 5... Are formed such that the recessed depth gradually decreases toward the inner side of the tube.

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