JP5491105B2 - Strip, joining structure of strip and joiner, and spiral tube using the same - Google Patents

Description

This invention strips, relates to the junction structure and the helical tube using it with strips and joiners, especially for example, wound wound spirally along the inner surface of the tube, by its width direction side edge is joined The present invention relates to a strip and a joining structure of a strip and a joiner that form a spiral tube.

  2. Description of the Related Art Conventionally, a technique for forming a helical tube by joining widthwise edges of strips spirally wound along the inner surface of a sewer pipe with a joiner is known.

  For example, in the spiral tube of Patent Document 1, a strip formed on each side edge of the joiner is fitted into a groove formed on each side edge of the strip so that the side edges of the strip are joined to each other. Has been. And even if the strip pitch is greatly expanded due to crustal movements such as earthquakes, the joiner breaks at the position of the notch before the strip fits with or disengages from the strip groove. The gap between the side parts separated from each other is sealed with water by the flexible part.

Patent Publication No. 2004-251340 [F16L 1/00]

  In the technique of Patent Document 1, the edge portions in the width direction of the strip are joined by a joiner, and a flexible portion is provided on the joiner, thereby allowing an external force in a direction in which the strip and the joiner are separated from each other. However, when the strip pitch spreads or deviates, an outward tensile force or shear force acts on the joint portion at the edge in the width direction of the strip. For this reason, in order to maintain the watertightness of the helical tube, a more reliable joining structure is desired for the joining portion at the edge in the width direction of the strip.

Another object of the present invention is to provide a novel, strips, joining the strips and the joiner structure and spiral tube using the same.

Another object of the present invention can hold the water-tightness of the spiral tube, the strip is to provide a joint structure and a helical tube using it with strips and joiner.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

A first aspect of the present invention is a strip which is spirally wound along the inner surface of a tube and forms a spiral tube by joining the side edges in the width direction by a joiner , and the strip body is formed in a strip shape. A plurality of anchor portions arranged at predetermined intervals in the width direction of the strip body , each projecting from one surface of the strip body in a first direction perpendicular thereto and spaced apart from the one surface by a predetermined dimension anchor portion having the anchor locking portion to the tip position, it is formed on each of the both widthwise side edges of the strip body, a first wall having a shape projecting in a first direction than near and the strip body strip body defined Ru groove by a second wall having a farther and than the first wall projecting in a first direction the shape from the strip body, provided on the distal end of the second wall of each groove, a Anchor portions in a flat portion that forms a flat surface at a position corresponding to the distal end surface of the hook engaging portion, and on the bottom surface of each groove, extending from the distal end of the first wall and in the immediate anchor portion of the first wall It is a strip provided with the reinforcement part connected with the position of a strip main body side rather than a stop part .

  In the first invention, the strip (10) includes a strip body (16) formed in a strip shape, and is wound spirally along the inner surface (100a) of the sewer pipe (100), for example, on the width direction side. The edges are joined to the joiner (12) to form the helical tube (14). A plurality of anchor portions (18) are formed on one surface of the strip body. The anchor portions are arranged at a predetermined interval in the width direction of the strip body. Moreover, the groove | channel (24) is formed in the side edge of the width direction of a strip main body. For example, the groove is formed over the entire length of the strip body, and when the strip and the joiner are joined, the groove and the protrusion (40, 42) of the joiner are fitted to each other. It becomes. A reinforcing part (32) is formed in the groove, and the reinforcing part stabilizes the shape of the groove by connecting the groove and the anchor part immediately adjacent to the groove.

  According to the first invention, for example, even if an external force acting in a direction that separates the strip and the joiner from each other due to a crustal movement such as an earthquake acts, the fitting between the strip groove and the joiner ridge is shifted or detached. There is nothing to do. Therefore, the water tightness of the helical tube can be maintained.

A second invention is a strip which is spirally wound along the inner surface of a tube and forms a spiral tube by joining the side edges in the width direction by a joiner. A plurality of anchor portions arranged at predetermined intervals in the width direction of the strip body, each projecting from one surface of the strip body in a first direction perpendicular thereto and spaced apart from the one surface by a predetermined dimension An anchor portion having an anchor locking portion at the tip end, and a first wall and a strip formed on each side edge in the width direction of the strip body, and having a shape that is close to the strip body and protrudes in the first direction from the strip body A groove defined by the second wall having a shape far from the main body and projecting in the first direction from the first wall, provided on the second wall of each groove, A first engaging portion that protrudes from the side surface, is provided on the second wall of each groove, and is formed to protrude in the same direction as the first engaging portion from the outer surface on the tip side of the first engaging portion. And a flat surface that is provided at the tip of the second wall of each groove and protrudes in the opposite direction to the first engaging portion and the contact portion and that forms a flat surface at a position corresponding to the tip surface of the anchor locking portion. It is a strip provided with a part.

According to a third aspect of the present invention, there is provided a strip which is spirally wound along the inner surface of a tube and forms a spiral tube by joining the widthwise side edges thereof, and a joiner which joins the widthwise side edges of the strips. A strip and a joiner for joining the strips to each other, wherein the strip is formed in a strip-shaped strip body, formed on one surface of the strip body, and at a predetermined interval in the width direction of the strip body. A plurality of anchor portions spaced apart from each other, a groove formed on a side edge in the width direction of the strip body, and defined by a first wall close to the strip body and a second wall far from the strip body , outside the second wall A first engaging portion that protrudes from the side surface, and a contact portion that is formed at a position closer to the tip than the first engaging portion and protrudes from the outer surface of the second wall ; Shape And a joiner body disposed between the side edges of the strip body, a first protrusion formed on the side edge of the joiner body in the width direction so as to be fitted to the groove, and formed on the inner side of the first protrusion. A second protrusion that clamps the second wall in cooperation with the first protrusion, and a second engagement that is formed to protrude from the outer surface of the second protrusion and is engaged with the first engagement portion. The contact portion is a joining structure of a strip and a joiner that comes into contact with the outer surface of the second protrusion in a state where the first engagement portion and the second engagement portion are engaged.

A fourth invention is wound wound spirally along the inner surface of the tube, the strip forming a spiral tube by the widthwise side edges are joined, a joiner for joining the widthwise side edges to each other of the strip A strip and a joiner for joining the strips to each other, wherein the strip is formed in a strip-shaped strip body, formed on one surface of the strip body, and at a predetermined interval in the width direction of the strip body. A plurality of anchor portions spaced apart from each other, a groove formed on a side edge in the width direction of the strip body, and defined by a first wall close to the strip body and a second wall far from the strip body, outside the second wall A first engaging portion that protrudes from the side surface, a contact portion that is located on the tip side of the first engaging portion and protrudes from the outer surface of the second wall, and an inner surface of the first wall And directly on the first wall Of comprising a reinforcing portion for connecting the anchor portion, Joiner and joiners body disposed between the side edges of the strip body is formed in a band shape, groove to be fitted to the width direction side edge of the joiner body The first ridge formed, the second ridge formed inside the first ridge and sandwiching the second wall in cooperation with the first ridge, and projecting from the outer surface of the second ridge A second engaging portion that is formed and engaged with the first engaging portion, and the contact portion is outside the second protrusion in a state where the first engaging portion and the second engaging portion are engaged with each other. It is a joining structure of a strip and a joiner that comes into contact with a side surface.

  In the fourth invention, the joiner (12) includes a band-shaped joiner body (38), and the joiner body is disposed between the side edges of the strip bodies (16) between adjacent strips (10). A first protrusion (40) and a second protrusion (42) are formed on both side edges in the width direction of the joiner body. The first protrusion is fitted in the strip groove (24). A 2nd protrusion is formed inside a 1st protrusion, and clamps the 2nd wall (28) of a strip in cooperation with a 1st protrusion. A second engagement portion (44) is formed on the outer surface of the second protrusion. For example, the second engagement portion is formed in a tapered shape that gradually protrudes outward toward the start end side of the second protrusion. For example, the first engagement portion of the strip and the second engagement portion of the joiner are engaged with each other by fitting the second wall of the strip between the first protrusion and the second protrusion of the joiner. . And in the state which the 1st engaging part and the 2nd engaging part engaged, the contact part (36) of a strip is contact | abutted on the outer surface of the 2nd protrusion of a joiner.

  According to the fourth invention, even if the strip or the joiner rotates and acts as a detachment force between the strip and the joiner, the contact portion of the strip hits the second protrusion of the joiner and is locked. And Joiner are very unlikely to leave. Therefore, separation of the strip and the joiner can be prevented, and as a result, the watertightness of the spiral tube can be more reliably maintained.

  A fifth invention is dependent on the fourth invention, and a receiving portion that is recessed inward is formed on the first wall of the strip, and the receiving portion includes a first engaging portion, a second engaging portion, and the like. Are engaged with the side edges of the joiner body.

  In the fifth invention, the first wall (26) of the strip (10) is formed with a receiving portion (30) that is recessed inward. A receiving part is a hollow which has a magnitude | size equivalent to the width direction side edge of a joiner (12), for example, is formed in the start end of a 1st wall. In a state where the first engaging portion (34) of the strip and the second engaging portion (44) of the joiner are engaged, the side edge of the joiner is fitted to the receiving portion.

  According to the fifth aspect of the present invention, even if the strip or the joiner rotates and acts as a detachment force between the strip and the joiner, the side edge of the joiner hits the receiving portion of the strip and is locked. It is very difficult to leave. Therefore, separation of the strip and the joiner can be prevented, and as a result, the watertightness of the spiral tube can be more reliably maintained.

  A sixth invention is dependent on the fourth or fifth invention, wherein the first engagement portion is formed in a tapered shape that gradually protrudes outward toward the distal end side of the second wall, and the second engagement portion is The second protrusion is formed in a tapered shape that gradually protrudes outward toward the start end side, and the surface on the tip end side of the first engagement portion and the surface on the start end side of the second engagement portion abut.

In the sixth invention, the first engaging portion (34) of the strip (10) is formed in a tapered shape that gradually protrudes outward toward the distal end side of the second wall (28). The surface (34a) is formed perpendicular to the second wall. Moreover, the 2nd engaging part (44) of a joiner (12) is formed in the taper shape which protrudes outside gradually as it goes to the starting end side of a 2nd protrusion (42), for example, the surface ( 44a) is formed perpendicular to the second ridge. Then, the second wall of the strip is fitted between the first ridge (40) and the second ridge of the joiner, and the leading end surface of the first engagement portion and the start end of the second engagement portion of the joiner. The first engagement portion of the strip and the second engagement portion of the joiner are engaged by bringing the side surface into contact with each other.
A seventh invention is a spiral tube formed by joining the widthwise side edges of a strip with a joiner using any one of the fourth to sixth inventions.

  According to the present invention, the strip groove and the anchor portion nearest to the groove are connected by the reinforcing portion, so that the watertightness of the spiral tube can be maintained.

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

It is sectional drawing which shows the joining state of the strip and joiner of one Example of this invention. It is sectional drawing which shows the strip of FIG. It is sectional drawing which shows the joiner of FIG. It is an illustration figure which shows the state which formed the helical tube in the inner surface of the sewer pipe | tube using the strip and joiner of FIG. It is an expanded sectional view which shows the junction part of the strip and joiner of FIG. FIG. 2 is an illustrative view showing a state where a rotational force acts on the strip or the joiner, which is a joint portion between the strip and the joiner of FIG. 1. FIG. 2 is an illustrative view showing a state where a rotational force acts on the strip or the joiner, which is a joint portion between the strip and the joiner of FIG. 1.

  Referring to FIG. 1, a strip 10 according to an embodiment of the present invention is spirally wound along an inner surface 100a of a sewer pipe 100, for example, in order to rehabilitate an aged sewer pipe 100. The direction side edges are joined to the joiner 12 to form a spiral tube (inner tube) 14.

In this embodiment, the sewage pipe 100 is a fume pipe. However, the present invention is not limited to this, and can also be applied to, for example, a synthetic resin pipe or a metal sewage pipe other than the fume pipe.

  As shown in FIGS. 1 and 2, the strip 10 is continuously formed by extrusion molding of a synthetic resin such as hard vinyl chloride, and includes a strip-shaped main body (strip main body) 16.

  An anchor portion 18 that protrudes toward the inner surface 100 a of the sewer pipe 100 is formed on one surface of the main body 16. The anchor portion 18 is for engaging with the filler 102 filled between the sewer pipe 100 and the strip 10 to make it difficult for the strip 10 to come off from the filler 102. Three anchor portions 18 are formed at a predetermined interval in the width direction of the main body 16. The anchor portion 18 is formed over the entire body along the longitudinal direction of the main body 16, and is formed at a band-shaped anchor leg portion 20 projecting toward the inner surface of the sewer pipe 100, and at the tip of the anchor leg portion 20. An anchor locking portion 22 is provided.

  The anchor locking portion 22 includes a first anchor locking portion 22 a and a second anchor locking portion 22 b, and the first anchor locking portion 22 a and the second anchor locking portion 22 b are in the height direction of the rib 18. Formed side by side. This is because when the filler 102 is filled between the sewer pipe 100 and the strip 10, the contact area between the strip 10 (anchor portion 18) and the inner surface 100 a of the sewer pipe 100 is reduced while the anchor effect is maintained. This is because the adhesion area between the backing material and the inner surface of the sewer pipe is increased by that amount, and thereby the adhesion strength between the inner surface 100a of the sewer pipe 100 and the filler 102 is increased.

  For example, the first anchor locking portion 22a is a portion where the distal end surface of the first anchor locking portion 22a is in surface contact with the inner surface 100a of the sewer pipe 100 in a state where the spiral tube 14 is formed in the sewer pipe 100, and It is formed. The first anchor locking portion 22a has a substantially trapezoidal shape having a large width on the tip side and a small width on the start side, and the width of the tip surface is, for example, 6 mm.

  Further, for example, the second anchor locking portion 22 b is formed on the start end side (the main body 16 side) with respect to the first anchor locking portion 22 a, and the center portion thereof is coupled to the anchor leg portion 20. The second anchor locking portion 22b has a substantially rectangular cross section, and its width is, for example, 9 mm.

  Further, a groove 24 is formed on both side edges in the width direction of the main body 16. Each groove 24 is formed over the entire length of the main body 16 and includes a first wall 26 close to the main body 16 and a second wall 28 far from the main body 16.

  A receiving portion 30 is formed on the first wall 26. The receiving part 30 is a dent toward the inside from the first wall 26, and is formed, for example, at the start end (end on the main body 16 side) of the first wall 26. The receiving portion 30 has a size corresponding to the side edge in the width direction of the joiner 12 and, as will be described in detail later, the first engagement portion 34 of the strip 10 and the second engagement of the joiner 12. In a state where the portion 44 is engaged, the side edge in the width direction of the joiner 12 is fitted to the receiving portion 30 (see FIG. 5).

  However, “inner side” in this embodiment means the center side of the strip 10 (main body 16), and “outer side” means the opposite side.

  A reinforcing portion 32 is formed on the inner side surface of the first wall 26. The reinforcing portion 32 is for stabilizing the shapes of the first wall 26 and the second wall 28, extends inward from the tip of the first wall 26, and is closest to the first wall 26 and the first wall 26 ( The anchor part 18 (anchor leg part 20) is connected.

  A first engagement portion 34 is formed on the outer surface of the second wall 28. The first engaging portion 34 is formed in a tapered shape that gradually protrudes outward toward the tip end side of the second wall 28. For example, the first engagement portion 34 has a substantially triangular cross section, and a front end surface (front end surface) 34 a is formed perpendicular to the second wall 28. As will be described in detail later, in a state where the first engagement portion 34 of the strip 10 and the second engagement portion 44 of the joiner 12 are engaged with each other, the surface 34a on the distal end side of the first engagement portion 34 The surface 44a on the start end side of the second engagement portion 44 of the joiner 12 comes into contact.

  Further, a contact portion 36 is formed on the outer surface of the second wall 28 at a position more distal than the first engagement portion 34. The contact portion 36 protrudes outward from the second wall 28, and the outer surface 36 a is formed in a tapered shape with the tip side protruding slightly outward. For example, the angle of the outer surface (tapered surface) 36a of the contact portion 36 and the angle of the outer surface (tapered surface) 42a of the second protrusion 42 of the joiner 12, which will be described in detail later, coincide with each other. . As will be described in detail later, in a state where the first engagement portion 34 of the strip 10 and the second engagement portion 44 of the joiner 12 are engaged, the tapered surface 36a of the contact portion 36 and the second protrusion 42 are formed. The tapered surface 42a comes into contact (see FIG. 5).

  The receiving portion 30, the reinforcing portion 32, the first engaging portion 34, and the contact portion 36 are formed along the entire length of the main body 16.

As shown in FIGS. 1 and 3, the joiner 12 is continuously formed by extrusion molding of a synthetic resin such as hard vinyl chloride, and includes a band-shaped main body (joiner main body) 38.

  A first protrusion 40 and a second protrusion 42 are formed on both side edges in the width direction of the main body 38 along the entire length of the main body 38. The first protrusion 40 is formed perpendicular to the main body 38 and protrudes toward the inner surface of the sewer pipe 100. The first protrusion 40 has a size corresponding to the groove 24 of the strip 10 and is fitted into the groove 24 of the strip 10 when the strip 10 and the joiner 12 are joined (see FIG. 5). .

  The second protrusion 42 is formed on the inner side of the first protrusion 40, and sandwiches the second wall 28 of the strip 10 in cooperation with the first protrusion 40. The tip end of the second protrusion 42 is bent inward and engages with the filler 102 filled between the sewer pipe 100 and the strip 10, similarly to the anchor portion 18 of the strip 10. Further, the outer surface 42a of the second protrusion is formed in a taper shape with the start side protruding slightly outward from the tip side, and as described above, the angle of the outer surface (taper surface) 42a is determined by the strip. The angle of the outer surface (tapered surface) of the ten contact portions 36 coincides with each other.

  A second engaging portion 44 that can engage with the first engaging portion 34 of the strip 10 is formed on the outer surface of the second protrusion 42. The second engaging portion 44 is formed in a tapered shape that gradually protrudes outwardly toward the start end side (the main body 38 side) of the second protrusion 42. The second engagement portion 44 has a substantially triangular cross section, and a surface 44 a on the start end side is formed perpendicular to the second protrusion 42.

  Further, a water stop material 46 such as rubber or elastomer is provided at a position of the main body 38 between the first protrusion 40 and the second protrusion 42. The water stop material 46 is a thin plate-like body, and is continuously provided over the entire body along the longitudinal direction of the main body 38, so that the second wall 28 of the strip 10 is connected to the first protrusion 40 of the joiner 12. When fitted between the second protrusions 42, it comes into contact with the start end of the second wall 28 of the strip 10 (see FIG. 5), and the water between them is stopped.

  Further, a flexible portion 48 is formed at a substantially central portion of one surface of the main body 38. The flexible portion 48 is made of, for example, synthetic rubber, soft synthetic resin, or elastomer, and is formed continuously along the longitudinal direction of the main body 38. As shown in FIG. 5, the flexible portion 48 is fixed to the outer surface of the main body 38 along the longitudinal direction of the main body 38 of the joiner 12 with the side edges 48a and 48a in the width direction spaced apart from each other. Yes.

  Further, a bent portion 50 is formed at a position of the main body 38 between the side edge 48a of the flexible portion 48 and the side edge 48a. The bent portion 50 has a substantially inverted U-shaped cross section, and is formed by bending a substantially central portion in the width direction of the main body 38. The bent portion 50 is formed continuously over the entire length of the main body 38 and protrudes to the outer surface side (the sewer pipe 100 side) of the main body 38.

  With reference to FIGS. 3 to 5, a method of rehabilitating the sewer pipe 100 by forming the spiral pipe 14 on the inner surface 100 a of the sewer pipe 100 will be described below.

  First, the strip 10 shown in FIG. 2 and the joiner 12 shown in FIG. 3 are prepared. Then, as shown in FIG. 4, the strip 10 is spirally wound along the inner surface 100 a of the sewage pipe 100, and the side edges in the width direction of adjacent strips 10 are joined together by the joiner 12. Form.

  Specifically, when the joining structure of the strip 10 and the joiner 12 is formed, the strip 24 of the strip 10 and the first protrusion 40 of the joiner 12 are fitted together as shown in FIG. The second wall 28 is fitted between the first protrusion 40 and the second protrusion 42 of the joiner 12 to engage the first engagement portion 34 of the strip 10 and the second engagement portion 44 of the joiner 12. Let That is, the surface 34a on the front end side of the first engagement portion 34 of the strip 10 and the surface 44a on the start end side of the second engagement portion 44 of the joiner 12 are brought into contact with each other. Then, the taper surface 36a of the contact portion 36 of the strip 10 and the taper surface 42a of the second protrusion 42 of the joiner 12 come into contact with each other, and the side edge of the joiner 12 is fitted into the receiving portion 30 of the strip 10.

  Next, the filler 102 is filled between the inner surface 100 a of the sewer pipe 100 and the spiral pipe 14. For example, mortar such as cement milk is used for the filler 102. The anchor portion 18 formed in the strip 10 is embedded in the filler 102, and the anchor portion 18 is firmly fixed to the filler 102 after the filler 102 is cured. This completes the construction of the spiral tube 14.

  In this embodiment, the strip groove 24 of the strip 10 and the anchor portion 18 closest to the strip groove 24 are connected by the reinforcing portion 32. For example, the direction in which the strip and the joiner are separated from each other due to crustal deformation such as an earthquake. Even if the external force is applied, the shape of the groove 24 of the strip 10 can be maintained without being deformed in the direction in which the groove 24 is expanded outward. Therefore, the fitting between the strip groove 24 of the strip 10 and the protrusion 40 of the joiner 12 is hardly shifted or detached. In other words, according to this embodiment, the water tightness of the joint portion between the strip 10 and the joiner 12 can be maintained, and as a result, the water tightness of the spiral tube 14 can be maintained.

  In this embodiment, the contact portion 36 of the strip 10 and the second engagement portion 44 of the joiner 12 are in a state where the first engagement portion 34 of the strip 10 and the second engagement portion 44 of the joiner 12 are engaged. And the side edge of the joiner 12 are fitted to the receiving portion 30 of the strip 10. For this reason, as shown in FIG. 6, even if the strip 10 rotates in the direction of the arrow A or the joiner 12 rotates in the direction of the arrow B and it acts as a detachment force between the strip 10 and the joiner 12, Since the contact portion 30 of the strip 10 hits the second locking portion 44 of the joiner 12 and is locked, the strip 10 and the joiner 12 are hardly separated. Further, as shown in FIG. 7, even if the strip 10 rotates in the direction of the arrow C or the joiner 12 rotates in the direction of the arrow D and acts as a detachment force between the strip 10 and the joiner 12, the joiner Since the side edges of the twelve contact with the receiving portion 30 of the strip 10 are locked, the strip 10 and the joiner 12 are hardly separated. Therefore, according to such a joining structure of the strip 10 and the joiner 12, it is possible to prevent the strip 10 and the joiner 12 from being detached, and to maintain the water tightness of the spiral tube 14 more reliably. Can do.

  In the above-described embodiment, the strip 10 is used to form the spiral pipe 14 that regenerates the sewage pipe 100 that has deteriorated. However, the present invention is not limited to this. For example, it can also be used to form a spiral tube 14 that protects the inner surface of a new sewage pipe.

  In the above-described embodiment, the strip 10 is spirally wound along the inner surface 100a of the sewage pipe 100, and the width direction side edges are joined to the joiner to form the spiral pipe 14. It is not necessary to be limited to this. For example, a strip 24 is formed on one side edge of the strip 10 (main body 16), and a ridge that can be fitted to the strip 24 is formed on the other side edge of the strip 10 (main body 16). The helical tube 14 may be formed by fitting the ten grooves 24 and the protrusions and joining them. In this case, for example, even if an external force acting in the direction of separating the adjacent strips 10 due to crustal deformation such as an earthquake acts, the fitting between the strip grooves 24 and the strips of the strip 10 may be shifted or detached. There is almost no. Therefore, the water tightness of the joint part between the strips 10 adjacent to each other can be maintained, and the water tightness of the spiral tube 14 can be maintained.

  Furthermore, in the above-described embodiment, the surface 34 a on the distal end side of the first engaging portion 34 of the strip 10 is formed perpendicular to the second wall 28, and the surface on the starting end side of the second engaging portion 44 of the joiner 12. 44a is formed perpendicular to the second protrusion 42, and in a state where the first engaging portion 34 of the strip 10 and the second engaging portion 44 of the joiner 12 are engaged, Although the surface 44a on the start end side is in surface contact, it need not be limited to this. Further, the first engaging portion 34 of the strip 10 is formed in a taper shape that gradually protrudes outward as it goes to the distal end side of the second wall 28, and the second engaging portion 44 of the joiner 12 has a second protrusion. Although it formed in the taper shape which protrudes outward gradually toward the starting end side of 42, it is not necessary to be limited to this. These are only for improving the locking force between the first engaging portion 34 and the second engaging portion 44, and the main point is that the first engaging portion 34 and the second engaging portion 44 are engaged. If possible, the shapes of the first engaging portion 34 and the second engaging portion 44 are not particularly limited.

  Furthermore, in the above-described embodiment, the angle of the taper surface 36a of the contact portion 36 of the strip 10 and the angle of the taper surface 42a of the second protrusion 42 of the joiner 12 coincide with each other. Although the surface 42a is in surface contact, it need not be limited to this. In addition, the outer surface 36a of the contact portion 36 is formed in a tapered shape with the tip side protruding slightly outward, and the outer surface 42a of the second protrusion 42 is formed in a tapered shape with the starting end side protruding slightly outward. It is not necessary to be limited to this. These are only for improving the locking force between the contact portion 36 and the second protrusion 42. In short, when the strip 10 or the joiner 12 is rotated, the second locking portion 44 of the joiner 12 is used. The shape of the contact portion 36 is not particularly limited as long as the contact portion 36 can be locked.

  Note that the specific numerical values such as the diameter and height described above are merely examples, and can be appropriately changed as necessary.

DESCRIPTION OF SYMBOLS 10 ... Strip 12 ... Joiner 14 ... Spiral tube 18 ... Anchor part 24 ... Groove 26 ... 1st wall 28 ... 2nd wall 30 ... Receiving part 32 ... Reinforcement part 34 ... 1st engaging part 36 ... Contact part 40 ... 1st 1 protrusion 42 ... 2nd protrusion 44 ... 2nd engaging part 100 ... sewer pipe

Claims (7)

A strip that is spirally wound along the inner surface of the tube and whose side edges in the width direction are joined by a joiner to form a spiral tube,
Strip body formed in a strip shape,
A plurality of anchor portions arranged at a predetermined interval in the width direction of the strip body, each projecting from one surface of the strip body in a first direction perpendicular thereto and having a predetermined dimension from the one surface An anchor portion having an anchor locking portion at a separated tip position;
The strip is formed in each of both widthwise side edges of the main body, said strip body near and first wall and said far from the strip body and the first wall having a shape protruding in the first direction than the strip body defined Ru groove by a second wall having a shape protruding in the first direction than,
A flat portion that is provided at the tip of the second wall of each groove and that forms a flat surface at a position corresponding to the tip surface of the anchor locking portion; and
Provided on the bottom surface of each groove, and includes a reinforcing portion that extends from the tip of the first wall and is connected to a position closer to the strip body than the anchor locking portion in the anchor portion closest to the first wall. ,strip. A strip that is spirally wound along the inner surface of the tube and whose side edges in the width direction are joined by a joiner to form a spiral tube,
Strip body formed in a strip shape,
A plurality of anchor portions arranged at a predetermined interval in the width direction of the strip body, each projecting from one surface of the strip body in a first direction perpendicular thereto and having a predetermined dimension from the one surface An anchor portion having an anchor locking portion at a separated tip position;
A first wall formed on each side edge in the width direction of the strip body and having a shape that is close to the strip body and protrudes in the first direction from the strip body, and far from the strip body and from the first wall And a groove defined by the second wall having a shape protruding in the first direction,
A first engagement portion provided on the second wall of each groove and formed to protrude from the outer surface of the second wall;
A contact portion that is provided on the second wall of each groove and is formed to protrude in the same direction as the first engagement portion from the outer surface on the tip side of the first engagement portion; and
A flat portion provided at a tip of the second wall of each groove, protruding in a direction opposite to the first engaging portion and the contact portion, and forming a flat surface at a position corresponding to the tip surface of the anchor locking portion; Equipped with a strip. In order to join together a strip that is spirally wound along the inner surface of the tube and that joins the widthwise side edges to form a spiral tube and a joiner that joins the widthwise side edges of the strip together Of the strip and joiner,
The strip is
Strip body formed in a strip shape,
A plurality of anchor portions formed on one surface of the strip body and arranged at predetermined intervals in the width direction of the strip body;
A groove formed on a side edge in the width direction of the strip body and defined by a first wall close to the strip body and a second wall far from the strip body;
A first engaging portion that protrudes from the outer surface of the second wall, and a position that is a tip side of the first engaging portion and that protrudes from the outer surface of the second wall. with a part,
The joiner
A joiner body formed in a strip shape and disposed between the side edges of the strip body;
A first protrusion formed on the side edge in the width direction of the joiner body so as to be able to be fitted with the groove;
A second ridge formed inside the first ridge and sandwiching the second wall in cooperation with the first ridge; and
A second engaging portion formed to protrude from the outer surface of the second protrusion and engaged with the first engaging portion;
The contact part is a joining structure of a strip and a joiner that abuts on the outer surface of the second protrusion in a state where the first engagement part and the second engagement part are engaged. Winding wound spirally along the inner surface of the tube, strip and, for joining together the joiner for joining the widthwise side edges to each other of the strips forming a spiral tube by the widthwise side edges are joined Of the strip and joiner,
The strip is
Strip body formed in a strip shape,
A plurality of anchor portions formed on one surface of the strip body and arranged at predetermined intervals in the width direction of the strip body;
A groove formed on a side edge in the width direction of the strip body and defined by a first wall close to the strip body and a second wall far from the strip body;
A first engaging portion formed to protrude from the outer surface of the second wall;
A contact portion which is located on the tip side of the first engagement portion and protrudes from the outer surface of the second wall; and
A reinforcing portion that connects the inner surface of the first wall and the anchor portion closest to the first wall;
The joiner
A joiner body formed in a strip shape and disposed between the side edges of the strip body;
A first protrusion formed on the side edge in the width direction of the joiner body so as to be able to be fitted with the groove;
A second ridge formed inside the first ridge, sandwiching the second wall in cooperation with the first ridge, and formed protruding from an outer surface of the second ridge; and A second engagement portion engaged with the first engagement portion;
The contact part is a joining structure of a strip and a joiner that abuts on the outer surface of the second protrusion in a state where the first engagement part and the second engagement part are engaged.   The first wall of the strip is formed with a receiving portion that is recessed inward, and the receiving portion has the joiner body in a state where the first engaging portion and the second engaging portion are engaged with each other. The joint structure of the strip and the joiner according to claim 4, which fits on the side edge of the strip.   The first engagement portion is formed in a tapered shape that gradually protrudes outward toward the distal end side of the second wall, and the second engagement portion gradually increases toward the start end side of the second protrusion. The strip and the joiner according to claim 4 or 5, wherein the strip and the joiner are formed in a tapered shape projecting outward, and a surface on a tip end side of the first engagement portion and a surface on a start end side of the second engagement portion abut. Bonding structure. A spiral tube formed by joining the widthwise side edges of a strip with a joiner using the joining structure of a strip and a joiner according to any one of claims 4 to 6.

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