JP7462226B2 - Pipe rehabilitation materials - Google Patents

Description

This invention relates to a pipe rehabilitation component that includes a lining component and a connecting component that connects the side edges of the lining component, and is used in a pipeline rehabilitation method in which a spiral pipe is made inside a manhole and then fed into an existing pipe.

One example of a conventional pipe rehabilitation member including a lining member and a connecting member is disclosed in Patent Document 1. In the technology of Patent Document 1, the lining member (strip-shaped body) has a strip-shaped base plate and joint recesses formed at both ends thereof. A metal reinforcing material is attached to this lining member. Meanwhile, the connecting member (fitting material) has a joint protrusion that fits into the joint recess of the lining member. When rehabilitating an existing pipe, a pipe making machine installed in a manhole is used to spirally wind the lining member and connect the side edges of the lining member with a connecting member to make a spiral pipe, and the spiral pipe made in the manhole is fed sequentially into the existing pipe. At this time, the connecting member is attached from the inner surface side of the lining member and forms the inner surface of the spiral pipe together with the lining member.

JP 2015-105658 A

With the technology of Patent Document 1, the connecting member is attached from the inside surface of the lining member, making it difficult to manufacture a relatively small-diameter spiral pipe that can correspond to an existing pipe with a medium diameter (for example, a diameter of 300 to 1000 mm). In addition, the manufactured spiral pipe is required to have a certain level of rigidity, but with the technology of Patent Document 1, the rigidity of the portion where the side edges of the lining members are connected by the connecting member is low, leaving concerns about the rigidity of the connecting portion of this spiral pipe.

Therefore, the primary objective of this invention is to provide a novel pipe rehabilitation component.

Another object of the invention is to provide a pipe rehabilitation component that is easy to manufacture into helical pipes and can be used appropriately to rehabilitate existing medium-diameter pipes.

Yet another object of the present invention is to provide a pipe rehabilitation member that can increase the rigidity of a helical pipe.

The first invention is a pipe rehabilitation member used in a pipeline rehabilitation method in which a lining member is wound in a spiral shape inside a manhole to produce a spiral pipe, and the spiral pipe is then fed into an existing pipe. The pipe rehabilitation member includes a lining member and a connecting member attached to the outer surface of the spirally wound lining member to connect adjacent side edges of the lining member. The lining member includes a strip-shaped lining base having one main surface that constitutes the inner surface of the spiral pipe, and a first fitting portion formed on each of both sides of the other main surface of the lining base. The connecting member includes a strip-shaped connecting base, a second fitting portion formed on one main surface of the connecting base and fitted with the first fitting portion, a pair of holding portions formed on the other main surface of the connecting base and arranged at a predetermined interval in the width direction of the connecting base, and a reinforcing member held by the pair of holding portions on the other main surface of the connecting base.

In the first invention, the pipe rehabilitation member includes a lining member and a connecting member, and is used in a pipeline rehabilitation method in which a spiral pipe is manufactured in a manhole while the manufactured spiral pipe is fed into an existing pipe. The lining member includes a strip-shaped lining base having one main surface that constitutes the inner surface of the spiral pipe, and a first fitting portion formed on each of both sides of the other main surface of the lining base (i.e., the surface on the outer surface side when the spiral pipe is formed). On the other hand, the connecting member is a member that is attached from the outer surface side of the spirally wound lining member and connects adjacent side edges of the lining member, and includes a strip-shaped connecting base and a second fitting portion formed on one main surface of the connecting base and fitted into the first fitting portion. In addition, a pair of holding portions are formed on the other main surface of the connecting base (i.e., the surface on the outer surface side when the spiral pipe is formed) and arranged at a predetermined interval in the width direction of the connecting base. A reinforcing member is provided on the other main surface side of the connecting base by being held by this pair of holding portions.

According to the first invention, the lining member has a fitting portion on its outer surface side with the connecting member, and the connecting member can be attached from the outer surface side of the lining member, so it is easy to manufacture a spiral pipe of a size corresponding to an existing medium-diameter pipe. Therefore, the pipe rehabilitation member can be appropriately used for the rehabilitation of existing medium-diameter pipes.

In addition, since the connecting member is equipped with a reinforcing member, the rigidity of the connecting portion of the spiral tube can be increased, and ultimately the rigidity of the entire spiral tube can be increased.

The second invention is dependent on the first invention, and the reinforcing member is a strip-shaped metal member.

According to the second invention, there is no need to manufacture reinforcing members specifically for pipe rehabilitation components, and commercially available metal members (e.g., strip steel) can be used as is, reducing component costs.

The third invention is dependent on the first or second invention, and the tips of the pair of retaining parts are located at the outermost radial positions of the helical tube when the helical tube is formed by connecting adjacent side edge parts of the lining member with the connecting member.

According to the third invention, the tips of the pair of holding parts 70 are located at the outermost part in the radial direction of the helical pipe, so that when the helical pipe is fed into the existing pipe, the contact area between the inner surface of the existing pipe and the outer surface of the helical pipe 102 is reduced. This reduces the insertion resistance of the helical pipe and reduces damage to the helical pipe due to sliding contact with the existing pipe. Therefore, the helical pipe manufactured in the manhole can be properly fed into the existing pipe. In addition, the connecting member can properly protect the lining member, and the reinforcing member can prevent damage to the inner surface of the existing pipe.

The fourth invention is dependent on any one of the first to third inventions, and each of the pair of retaining portions is formed on both side edges of the other main surface of the connecting base.

According to the fourth aspect of the invention, a pair of retaining parts are formed on both side edges of the connecting base, so that a wide reinforcing member can be used. In other words, a reinforcing member that ensures rigidity and strength while keeping the thickness low can be used.

According to this invention, the lining member has a fitting portion on its outer surface side for the connecting member, and the connecting member can be attached from the outer surface side of the lining member, so it is easy to manufacture a spiral pipe of a size corresponding to an existing medium-diameter pipe. Therefore, the pipe rehabilitation member can be appropriately used for the rehabilitation of existing medium-diameter pipes.

In addition, since the connecting member is equipped with a reinforcing member, the rigidity of the connecting portion of the spiral tube can be increased, and ultimately the rigidity of the entire spiral tube can be increased.

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

1 is a schematic diagram showing how an existing pipe is rehabilitated using a pipe rehabilitation member according to one embodiment of the present invention; FIG. FIG. 2 is a diagram showing how a helical pipe is formed using the pipe rehabilitation member of FIG. 1 . 2 is a perspective view showing a lining member provided in the pipe rehabilitation member of FIG. 1 . FIG. 4 is a cross-sectional view showing the lining member of FIG. 3 . 2 is a perspective view showing a connecting member provided in the pipe rehabilitation member of FIG. 1 . FIG. 6 is a cross-sectional view showing the connecting member of FIG. 5 . 6 is a cross-sectional view showing the state in which the side edges of the lining member of FIG. 3 are connected to each other using the connecting member of FIG. 5 . 6 is a cross-sectional view showing a connection portion between the lining member of FIG. 3 and the connecting member of FIG. 5 . 2 is a cross-sectional view showing a state in which an existing pipe is rehabilitated by a spiral pipe formed using the pipe rehabilitation member of FIG. 1.

Referring to FIG. 1, a pipe rehabilitation member 10 according to one embodiment of the present invention is used in a push-in type pipeline rehabilitation method in which a lining member 12 is wound in a spiral shape inside a starting manhole 110 to produce a helical pipe 102 (lining pipe), and the produced helical pipe 102 is then fed sequentially into an existing pipe 100. As will be described in detail later, this pipe rehabilitation member 10 is composed of a lining member 12 and a connecting member 14 that connects the side edges of the lining member 12 together.

The pipe rehabilitation member 10 can be used to rehabilitate various existing pipes 100, such as those made of reinforced concrete, synthetic resin, and metal. The pipe rehabilitation member 10 is also suitable for rehabilitating sewer pipes with a medium diameter of 300 mm to 1000 mm, where it is difficult for workers to enter the interior and perform work, and is particularly suitable for rehabilitating sewer pipes with a diameter of 600 mm to 800 mm. However, the pipe rehabilitation member 10 can also be used to rehabilitate existing pipes 100 with a diameter exceeding 1000 mm.

1 and 2, the pipe rehabilitation member 10 is a member for forming a spiral pipe 102, and includes a long strip-shaped lining member 12 and a long strip-shaped connecting member 14 that connects adjacent side edges of the spirally wound lining member 12. In this embodiment, the lining member 12 has an engaging portion (first engaging portion 22) with the connecting member 14 on the outer surface side when wound spirally, and the connecting member 14 is attached to the lining member 12 from the outer surface side of the spirally wound lining member 12. The outer diameter of the spiral pipe 102 formed using the pipe rehabilitation member 10 is set to be slightly smaller than the inner diameter of the existing pipe 100. The configurations of the lining member 12 and the connecting member 14 will be specifically described below.

As shown in Figures 3 and 4, the lining member 12 is a long member that is the main component of the helical tube 102, and includes a strip-shaped base body 20 (lining base body). One main surface 20a of the base body 20 is a surface that constitutes the inner surface of the helical tube 102, and is a smooth surface. The width of the base body 20 is, for example, 75 mm, and the thickness (wall thickness) of the base body 20 is, for example, 2.5 mm.

On both sides of the other main surface 20b of the base 20, that is, on the outer surface side when the lining member 12 is wound in a spiral shape, a first fitting portion 22 is formed to fit into a second fitting portion 52 of the connecting member 14 described later. The first fitting portion 22 includes a first engagement portion 24 formed on both side edges of the other main surface 20b of the base 20, and a third engagement portion 26 formed at a predetermined distance from the first engagement portion 24, on the inner side in the width direction of the base 20 than the first engagement portion 24.

The first engagement portion 24 is a portion that engages with the second engagement portion 54 of the connecting member 14, which will be described later. This first engagement portion 24 has a first ridge 28 that extends in the longitudinal direction of the base body 20. A first locking piece 30 is formed at the tip of one side surface 28a of this first ridge 28 (the inner surface in the width direction of the base body 20). In addition, the other side surface 28b of the first ridge 28 forms an inclined surface that slopes inward in the width direction of the base body 20 as it moves away from the base body 20.

The third engagement portion 26 is a portion that engages with a fourth engagement portion 56 of the connecting member 14, which will be described later. This third engagement portion 26 has a third ridge 32 that extends in the longitudinal direction of the base 20. A third locking piece 34 is formed at the tip of one side surface 32a of this third ridge 32 (the inner surface in the width direction of the base 20). In addition, an inclined surface is formed at the tip of the other side surface 32b of the third ridge 32, which slopes inward in the width direction of the base 20 as it moves away from the base 20.

In addition, a displacement absorbing section 36 is formed in the center of the width of the base 20, where a part of the base 20 is loosened in the width direction so as to protrude toward the other main surface 20b. The thickness of the displacement absorbing section 36 is approximately the same as the thickness of the other parts of the base 20. The displacement absorbing section 36 has a pair of side wall sections 38 formed to expand in the width direction as it moves away from the one main surface 20a, and a connecting section 40 connecting the tips of the side wall sections 38. A gap 42 is formed between the base ends of the displacement absorbing section 36. The protruding height of the displacement absorbing section 36 from the other main surface 20b is, for example, 12 mm, and the width of the gap 42 is, for example, 1 mm.

Since the base body 20 has the displacement absorbing portion 36 in this way, the spiral pipe 102 formed using the lining member 12 is easily deformed in the axial direction and the bending direction at the displacement absorbing portion 36. Therefore, when the spiral pipe 102 is fed into the existing pipe 100 as described below, the deformation of the displacement absorbing portion 36 allows the spiral pipe 102 to follow the bends, bends, and steps of the existing pipe 100. In addition, after construction, when an earthquake occurs, the displacement absorbing portion 36 expands to absorb the axial displacement, so that deformation at the connection portion between the side edges of the lining member 12 is suppressed, and the fit between the first fitting portion 22 of the lining member 12 and the second fitting portion 52 of the connecting member 14 is properly maintained. In addition, by having a gap 42 between the base ends of the displacement absorbing portion 36, the displacement absorbing portion 36 can also shrink in the width direction. Furthermore, the side wall portion 38 of the displacement absorbing portion 36 is formed so that it expands in the width direction as it moves away from the one main surface 20a, so that the outer surface of the side wall portion 38 in the width direction also functions as an anchor portion for the filler material 104 (see FIG. 9).

Such a lining member 12 is integrally molded by extrusion molding of synthetic resin such as polyethylene resin, polypropylene resin, nylon resin, fluororesin, and rigid polyvinyl chloride resin. The first fitting portion 22 including the first engaging portion 24 and the third engaging portion 26 and the displacement absorbing portion 36 are formed over the entire length of the base body 20 in the longitudinal direction. Here, the lining member 12 is preferably formed from a polyolefin resin such as polyethylene resin and polypropylene resin. The lining member 12 in this embodiment is formed from high-density polyethylene resin.

By forming the lining member 12 from a polyolefin resin such as polyethylene resin, it is possible to fusion-join the longitudinal ends of the lining member 12, and the strength and smoothness of the joint can be appropriately ensured. In addition, since polyolefin resins are flexible, the lining member 12 formed from polyolefin resins can be easily wound in a spiral shape. Therefore, a spiral pipe 102 of a size (i.e., a relatively small diameter) corresponding to an existing pipe 100 having a medium diameter of 300 mm to 1000 mm can be appropriately formed. Furthermore, the displacement absorbing portion 36 becomes easily deformed, and the spiral pipe 102 can easily follow the displacement during construction and earthquakes. Furthermore, since polyolefin resins have excellent abrasion resistance and chemical resistance, the durability of the spiral pipe 102, such as abrasion resistance and chemical resistance, is also improved by forming the lining member 12 constituting the inner surface of the spiral pipe 102 from a polyolefin resin.

As shown in Figures 5 and 6, the connecting member 14 is a long member for connecting the side edges of the lining member 12, and includes a connecting member body 16 and a reinforcing member 18. The connecting member 14 is a member that is attached from the outer surface side (the other main surface 20b side) of the lining member 12 as described above, and is configured to be arranged on the outer surface side of the spiral pipe 102 and not exposed on the inner surface side of the spiral pipe 102 when the spiral pipe 102 is formed using the lining member 12 and the connecting member 14.

The connecting member body 16 has a strip-shaped base 50 (connecting base). The width of the base 50 is, for example, 37 mm, and the thickness of the base 50 is, for example, 3 mm.

One main surface 50a of the base 50 is a surface facing the other main surface 20b of the base 20 of the lining member 12, and a second fitting portion 52 that fits into the first fitting portion 22 of the lining member 12 is formed on the one main surface 50a of the base 50. The second fitting portion 52 includes a second engagement portion 54 and a fourth engagement portion 56. The fourth engagement portion 56 is formed on both sides of the one main surface 50a of the base 50. The second engagement portion 54 is formed on the inside of the fourth engagement portion 56 in the width direction of the base 50, with a predetermined distance between it and the fourth engagement portion 56.

The second engagement portion 54 has a second ridge 58 extending in the longitudinal direction of the base 50. A second locking piece 60 that locks the first locking piece 30 of the lining member 12 is formed at the tip of one side surface 58a (the inner surface in the width direction of the base 50) of this second ridge 58. On the other hand, the fourth engagement portion 56 has a fourth ridge 62 extending in the longitudinal direction of the base 50. A fourth locking piece 64 that locks the third locking piece 34 of the lining member 12 is formed at the tip of one side surface 62a (the inner surface in the width direction of the base 50) of this fourth ridge 62.

In addition, water-stopping sections 66 formed in a band shape from an elastic material such as elastomer are provided on one main surface 50a of the base body 50 between the second engaging section 54 and the fourth engaging section 56, and between the second engaging sections 54 themselves. When the first fitting section 22 of the lining member 12 and the second fitting section 52 of the connecting member 14 are fitted together, the water-stopping sections 66 are sandwiched between the one main surface 50a of the base body 50 and the tips of the first engaging section 24 and the third engaging section 26 of the lining member 12, and are sufficiently compressed (see FIG. 8). This ensures water-tightness at the connecting portions between the side edges of the lining member 12.

Furthermore, both side edges of one main surface 50a of the base 50 protrude outward beyond the other side surface 62b of the fourth protrusion 62 (the outer surface in the width direction of the base 50), and this portion is used as an anchor portion 68 for the filler 104.

On the other hand, the other main surface 50b of the base 50 is a surface facing the inner surface of the existing pipe 100, and a pair of retaining portions 70 arranged at a predetermined interval in the width direction of the base 50 are formed on the other main surface 50b of the base 50. Each of the pair of retaining portions 70 has a protrusion portion 72 extending in the longitudinal direction of the base 50 and a claw portion 74 formed at the tip of the protrusion portion 72 and protruding toward the inside in the width direction of the base 50. In this embodiment, each of the pair of retaining portions 70 is formed on both side edges of the other main surface 50b of the base 50, and the side surface of the base 50 and the width direction outer side surface of the protrusion portion 72 are formed to be flush with each other. By forming the retaining portion 70 on both side edges of the other main surface 50b of the base 50, a reinforcing member 18 with a wide width can be used as described later. In other words, a reinforcing member 18 that ensures rigidity and strength while suppressing thickness can be used.

The tip of the retaining portion 70 is the portion that comes into contact with the inner surface of the existing pipe 100 when the spiral pipe 102 is fed into the existing pipe 100 as described below. By forming the retaining portion 70 on both side edges of the other main surface 50b of the base 50, the tip of the retaining portion 70 comes into contact with the inner surface of the existing pipe 100 in a well-balanced manner. The overall thickness of the connecting member main body 16 (the thickness from the tip of the second fitting portion 52 to the tip of the retaining portion 70) is, for example, 13 mm.

Then, the other main surface 50b side of the base 50 of the connecting member main body 16 is held by a pair of holding parts 70, so that a long reinforcing member 18 is provided over the entire length of the connecting member main body 16 in the longitudinal direction. In this embodiment, a strip-shaped metal member (e.g., strip steel) is used as the reinforcing member 18. The reinforcing member 18 has a rectangular cross-sectional shape, and its width is, for example, 30 mm, and its thickness is, for example, 2.5 mm. By providing the reinforcing member 18 to the connecting member 14, the rigidity of the connecting portion of the spiral pipe 102 (the portion where the side edges of the lining member 12 are connected by the connecting member 14) can be increased, and the rigidity of the spiral pipe 102 can be increased. In addition, by adopting a strip-shaped metal member as the reinforcing member 18, the reinforcing member 18 does not need to be specially manufactured for the pipe rehabilitation member 10, and a commercially available metal member (strip steel) can be used as it is, so that the cost of the member can be reduced.

In such a connecting member 14, the connecting member body 16 is integrally molded by extrusion molding of synthetic resin such as hard polyvinyl chloride resin, nylon resin, fluororesin, polyethylene resin, and polypropylene resin. The second fitting portion 52 including the second engaging portion 54 and the fourth engaging portion 56 and the pair of holding portions 70 are formed over the entire length of the base body 50 in the longitudinal direction. In this case, it is preferable that the connecting member body 16 is formed of a synthetic resin such as hard polyvinyl chloride resin, which has a greater strength than polyolefin resin. The connecting member body 16 in this embodiment is formed of hard polyvinyl chloride resin. The water stop portion 66 is provided over the entire length of the longitudinal direction by co-extrusion with the connecting member body 16. In addition, the reinforcing member 18 is provided over the entire length of the connecting member body 16 in the longitudinal direction by being fitted between the pair of holding portions 70 from the other main surface 50b side of the base body 50 after the manufacturing of the connecting member body 16.

By forming the connecting member body 16 from a rigid polyvinyl chloride resin with high strength, the rigidity of the entire spiral pipe 102 can be improved compared to forming both the lining member 12 and the connecting member 14 from a polyolefin resin. In addition, when the spiral pipe 102 is fed into the existing pipe 100 as described below, the connecting member body 16 can adequately protect the lining member 12. Furthermore, since the strength of the second fitting portion 52 is also increased, the first fitting portion 22 and the second fitting portion 52 are less likely to come off, and the side edges of the lining member 12 can be firmly connected to each other. Therefore, deformation of this connecting portion during an earthquake or the like is suppressed, and the water-stopping function can be ensured. Furthermore, rigid polyvinyl chloride resin has better moldability than polyolefin resin, and the dimensions of the connecting member body 16 can be easily produced. In addition, rigid polyvinyl chloride resin has higher adhesion to water-stopping materials than polyolefin resin.

7 and 8, when adjacent side edges of the spirally wound lining member 12 are connected by the connecting member 14, the side edges of the base 20 of the lining member 12 are butted together so that the main surfaces 20a of the base 20 are flush with each other. Then, the connecting member 14 is pushed in from the outer surface side of the spirally wound lining member 12, and the second fitting portion 52 of the connecting member 14 is fitted sequentially in the longitudinal direction into the first fitting portion 22 of the lining member 12. Then, the second locking piece 60 and the fourth locking piece 64 of the second fitting portion 52 lock the first locking piece 30 and the third locking piece 34 of the first fitting portion 22, respectively, and the side edges of the lining member 12 are connected by the connecting member 14.

In this embodiment, when the side edges of the lining members 12 are connected by the connecting members 14, that is, when the helical pipe 102 is formed, the side edges of the bases 20 of the lining members 12 are directly butted against each other, and the connecting members 14 are not exposed on the inner surface of the helical pipe 102. Therefore, the number of seams that appear on the inner surface of the helical pipe 102 can be reduced, making the inner surface of the helical pipe 102 smooth and improving the flow performance of the helical pipe 102. In addition, since only the lining members 12 made of polyethylene resin (polyolefin resin) are exposed on the inner surface of the helical pipe 102, the durability of the helical pipe 102, such as its abrasion resistance and chemical resistance, is also improved.

In addition, when the side edges of the lining members 12 are connected to each other by the connecting member 14, the side edges of the adjacent base bodies 20 are butted against each other at the connection portion, the first locking pieces 30 of the lining members 12 face outward from each other around the side edges of the base bodies 20, and the second locking pieces 60 of the connecting member 14 face inward from each other around the side edges of the base bodies 20. In other words, at the connection portion between the side edges of the lining members 12, the first locking portion 24 of the lining members 12 is sandwiched by the second locking portion 54 of the connecting member 14. Therefore, a force acts on the lining members 12 in the direction in which the side edges of the adjacent base bodies 20 approach each other (in the direction in which they come into contact) due to the engagement between the first locking portion 24 and the second locking portion 54. Therefore, the side edges of the base bodies 20 of the lining members 12 can be fixed in a state in which they are appropriately in close contact with each other.

Similarly, at the connection portion between the side edges of the lining member 12, the third locking pieces 34 of the lining member 12 face outward from each other, and the fourth locking pieces 64 of the connecting member 14 face inward from each other, with the side edge of the base 20 as the center, so that the third engaging portion 26 of the lining member 12 is sandwiched by the fourth engaging portion 56 of the connecting member 14. Therefore, in addition to the engagement between the first engaging portion 24 and the second engaging portion 54, a force acts on the lining member 12 in the direction of bringing the side edges of the adjacent bases 20 closer to each other due to the engagement between the third engaging portion 26 and the fourth engaging portion 56. Therefore, the side edges of the bases 20 of the lining member 12 can be fixed in a state of more appropriate close contact.

As described above, the side edges of the lining member 12 are connected to each other by double engagement including the engagement between the first engaging portion 24 and the second engaging portion 54 and the engagement between the third engaging portion 26 and the fourth engaging portion 56, so that the resistance to the pulling direction (the direction in which the lining members 12 move away from each other) is large in this connecting portion. Therefore, even if the helical tube 102 is subjected to axial displacement during an earthquake or the like, deformation of the connecting portion (the first engaging portion 22 and the second engaging portion 52) is suppressed, and the water-stopping function of the water-stopping portion 66 can be ensured. In addition, since the connecting strength is ensured by double engagement, there is no need to increase the thickness of the first engaging portion 24, the second engaging portion 54, the third engaging portion 26, and the fourth engaging portion 56 in order to increase the connecting strength, and the thickness can be made uniform with other portions, i.e., the entire member can be made uniform in thickness, making it easy to mold.

Furthermore, since the other side surface 28b of the first protrusion 28 of the first engagement portion 24 is an inclined surface, when the side edges of the lining member 12 are connected to each other by the connecting member 14, a gap 80 is formed on the other side surface 28b side of the first protrusion 28. When the first engagement portion 24 and the second engagement portion 54 are engaged, the first engagement portion 24 made of polyethylene mainly elastically deforms and tilts toward the other side surface 28b side, but the presence of the gap 80 ensures that the first engagement portion 24 can fall. Therefore, the force (pushing force) required to engage the first engagement portion 24 and the second engagement portion 54 can be reduced, making it easier to attach the connection member 14 to the lining member 12.

Similarly, when the side edges of the lining member 12 are connected to each other by the connecting member 14, a gap 82 is formed on the other side surface 32b of the third protrusion 32. When the third engaging portion 26 and the fourth engaging portion 56 are engaged, the third engaging portion 26 mainly elastically deforms and tilts toward the other side surface 32b, but the presence of the gap 82 ensures that the third engaging portion 26 can fall. Therefore, the force required to engage the third engaging portion 26 and the fourth engaging portion 56 can be reduced, making it easier to attach the connecting member 14 to the lining member 12.

Furthermore, when the side edges of the lining member 12 are connected to each other by the connecting member 14, the tips of the pair of holding parts 70 formed on the base 50 of the connecting member 14 are located at the outermost radial position of the spiral pipe 102. In other words, the tips of the holding parts 70 are located radially outward from the outer surface of the connecting part 40 of the displacement absorbing part 36 of the lining member 12 and the outer surface of the reinforcing member 18. Therefore, when the spiral pipe 102 is fed into the existing pipe 100, the tips of the holding parts 70 slide against the inner surface of the existing pipe 100, and the lining member 12 does not or does not slide against the inner surface of the existing pipe 100, so that the connecting member 14 can adequately protect the lining member 12 (especially the displacement absorbing part 36). In addition, the metallic reinforcing member 18 does not or does not slide against the inner surface of the existing pipe 100, so that the inner surface of the existing pipe 100 can be prevented from being damaged by the reinforcing member 18.

When the spiral pipe 102 is fed into the existing pipe 100, the tip of the holding portion 70 slides against the inner surface of the existing pipe 100, thereby reducing the contact area between the inner surface of the existing pipe 100 and the outer surface of the spiral pipe 102. This reduces the insertion resistance of the spiral pipe 102 and reduces damage to the spiral pipe 102 caused by sliding against the existing pipe 100. In this embodiment, the connecting member body 16 is made of a rigid polyvinyl chloride resin with high strength, so the protective effect of the lining member 12 and the effect of reducing damage to the spiral pipe 102 are more appropriately exerted.

Next, referring to Figures 1 and 9, an example of a pipeline rehabilitation method for rehabilitating an existing pipe 100 using the above-mentioned pipe rehabilitation member 10 will be specifically described. In this embodiment, the existing pipe 100 between the starting manhole 110 and the arrival manhole 112 will be rehabilitated.

When rehabilitating an existing pipe 100, first, a pipe making machine 114 is installed inside the starting manhole 110, and a pipe rehabilitation member 10 including a lining member 12 and a connecting member 14 is installed on the ground near the starting manhole 110. The lining member 12 and the connecting member 14 should be prepared and installed individually wound into rolls. The inside of the existing pipe 100 is cleaned in advance using a high-pressure washer or the like.

Next, as shown in FIG. 1, a spiral pipe 102 is installed in the existing pipe 100. That is, the lining member 12 and the connecting member 14 are supplied from the ground to a pipe making machine 114 installed in the starting manhole 110, and the spiral pipe 102 formed by this pipe making machine 114 is fed sequentially from the starting manhole 110 into the existing pipe 100. In the pipe making machine 114, the lining member 12 is wound spirally so that the side edges of the base 20 of the lining member 12 are butted together, and the connecting member 14 is attached from the outer surface side of the lining member 12 to connect adjacent side edges of the lining member 12, thereby manufacturing the spiral pipe 102.

Here, when the lining member 12 is wound in a spiral shape to make a pipe, the side edges of the base 20 of the lining member 12 are butted against each other, so that the positioning of the lining member 12 is easy and the pipe is easy to make. In addition, the lining member 12 has a fitting portion with the connecting member 14 on the other main surface 20b side (outer surface side) of the base 20, so that the connecting member 14 can be attached from the outer surface side of the lining member 12 wound in a spiral shape. Therefore, it is easy to make a spiral pipe 102 of a size (i.e., a relatively small diameter) corresponding to an existing pipe 100 of a medium diameter of 300 mm to 1000 mm or less, which is difficult to make a pipe with a pipe rehabilitation member that attaches a connecting member from the inner surface side of the lining member. In addition, since the spiral pipe 102 is formed using two members, the lining member 12 and the connecting member 14, after the lining member 12 is wound around and positioned, the side edges of the lining member 12 can be connected and fixed by the connecting member 14. Therefore, when forming the helical pipe 102, it is easy to match the circumferential length (diameter) of adjacent lining members 12, and a helical pipe 102 with a uniform diameter over the entire axial length can be formed. Furthermore, since the connecting member 14 is provided with a reinforcing member 18, the manufactured helical pipe 102 has high rigidity (and strength).

The spiral pipe 102 produced in the pipe-making machine 114 is pushed out of the pipe-making machine 114 in order from the produced portion, and is fed into the existing pipe 100 toward the destination manhole 112 while rotating. At this time, the connecting member 14 is arranged on the outer surface side of the spiral pipe 102, and the tips of the pair of holding parts 70 provided on the connecting member 14 are located at the outermost part in the radial direction of the spiral pipe 102, so that the contact area between the inner surface of the existing pipe 100 and the outer surface of the spiral pipe 102 is reduced. This reduces the insertion resistance of the spiral pipe 102, and also reduces damage to the spiral pipe 102 due to sliding contact with the existing pipe 100. Therefore, the spiral pipe 102 can be appropriately fed into the existing pipe 100. In addition, the connecting member 14 can appropriately protect the lining member 12, and the reinforcing member 18 can prevent the inner surface of the existing pipe 100 from being damaged.

After the spiral pipe 102 has been installed over the entire length of the rehabilitated section of the existing pipe 100, filler material 104 is then injected between the inner surface of the existing pipe 100 and the outer surface of the spiral pipe 102. As the filler material 104 hardens, a rehabilitated pipe (composite pipe) 106 is formed in which the existing pipe 100 and the spiral pipe 102 are integrated, as shown in FIG. 9. Cleanup work and other procedures are then carried out as appropriate to complete the rehabilitation work on the existing pipe 100.

When forming the rehabilitation pipe 106, the side wall portion 38 of the displacement absorbing portion 36 of the lining member 12 and the anchor portion 68 (both side edges of one main surface of the base 50 of the connecting member main body 16) of the connecting member 14 exert an anchor effect, making it difficult for the spiral pipe 102 to come off the filling material 104, improving the fixing strength between the spiral pipe 102 and the filling material 104. Therefore, the existing pipe 100 and the spiral pipe 102 can be firmly integrated by the filling material 104.

As described above, according to this embodiment, the lining member 12 has a fitting portion for the connecting member 14 on its outer surface side, and the connecting member 14 can be attached to the lining member 12 from the outer surface side of the lining member 12, so that it is easy to manufacture a spiral pipe 102 of a size corresponding to an existing pipe 100 having a medium diameter of 300 mm or more and 1000 mm or less. Therefore, the pipe rehabilitation member 10 can be appropriately used for the rehabilitation of an existing pipe 100 of a medium diameter.

In addition, since the connecting member 14 includes the reinforcing member 18, the rigidity of the connecting portion of the spiral pipe 102 can be increased, and the rigidity of the entire spiral pipe 102 can be increased. This prevents the spiral pipe 102 from becoming flat when filling with the filler 104. In addition, the strength of the rehabilitated pipe 106 that is formed can be increased.

Furthermore, the connecting member 14 is disposed on the outer surface side of the spiral pipe 102, and the tips of the pair of holding parts 70 formed on the connecting member main body 16 are positioned at the outermost part in the radial direction of the spiral pipe 102, so that when the spiral pipe 102 is fed into the existing pipe 100, the contact area between the inner surface of the existing pipe 100 and the outer surface of the spiral pipe 102 is reduced. This reduces the insertion resistance of the spiral pipe 102 and reduces damage to the spiral pipe 102 due to sliding contact with the existing pipe 100. Therefore, the spiral pipe 102 manufactured in the starting manhole 110 can be appropriately fed into the existing pipe 100. In addition, the connecting member 14 can appropriately protect the lining member 12, and the reinforcing member 18 can prevent the inner surface of the existing pipe 100 from being damaged.

The specific configuration or shape of the above-mentioned pipe rehabilitation member 10 (lining member 12 and connecting member 14) may be modified as appropriate as long as it allows the connecting member 14 to be attached from the outer surface side of the lining member 12.

For example, in the above embodiment, the lining member 12 has two engagement portions (first engagement portion 24 and third engagement portion 26) as an engagement portion (first engagement portion 22) with the connecting member 14, but there may be only one engagement portion. Similarly, the connecting member body 16 of the connecting member 14 has two engagement portions (second engagement portion 54 and fourth engagement portion 56) as an engagement portion (second engagement portion 52) with the lining member 12, but there may be only one engagement portion. In addition, one of the engagement portions formed on the lining member 12 and the connecting member 14 can be formed in a groove shape and the other engagement portion can be formed in a ridge shape that fits into the groove.

In the above embodiment, the reinforcing member 18 is held between a pair of holding parts 70 so that the reinforcing member 18 does not protrude radially outward beyond the tip of the holding part 70, but this is not limited thereto. The reinforcing member 18 may be held on the radial outer surface side of the holding part 70.

In addition, although not provided in the above embodiment, a reinforcing member may be attached to the outer surface side (other main surface 20b side) of the lining member 12 to increase rigidity.

Furthermore, in the above embodiment, a gap 42 is formed between the base ends of the displacement absorbing portions 36 of the lining member 12, but this gap 42 does not necessarily have to be formed. Also, a thin film portion that connects the one main surfaces 20a of the base body 20 to each other may be integrally molded to cover the gap 42, or the thin film portion may be attached later. Furthermore, the lining member 12 does not necessarily have to include the displacement absorbing portion 36, and an anchor portion with a T-shaped cross section extending in the longitudinal direction of the base body 20 can be formed on the other main surface 20b of the base body 20 instead of or together with the displacement absorbing portion 36.

In addition, in the above-mentioned embodiment, the pipe rehabilitation member 10 is used in a push-type pipeline rehabilitation method in which the spiral pipe 102 is rotated while being fed into the existing pipe 100, but this is not limited to the above. The pipe rehabilitation member 10 can also be used in a towing-type pipeline rehabilitation method in which the spiral pipe 102, which is manufactured in the starting manhole 110, is pulled from the arrival manhole 112 side by a winch or the like, so that the spiral pipe 102 is fed into the existing pipe 100 without being rotated.

In addition, in the above-mentioned embodiment, the existing pipe 100 and the spiral pipe 102 are integrated with the filler 104 to form a composite pipe (rehabilitation pipe 106), but this is not limited to this. The pipe rehabilitation member 10 can also form a free-standing pipe that maintains its strength independently of the existing pipe 100.

Note that the specific values such as dimensions listed above are merely examples and can be changed as necessary depending on the product specifications, etc.

REFERENCE SIGNS LIST 10 Pipe rehabilitation member 12 Lining member 14 Connecting member 16 Connecting member body 18 Reinforcing member 20 Base of lining member (lining base)
22 ... First fitting portion 50 ... Base of the connecting member main body (connecting base)
52 ... second fitting portion 70 ... holding portion 100 ... existing pipe 102 ... spiral pipe 104 ... filling material 106 ... rehabilitation pipe

Claims (4)

A pipe rehabilitation member used in a pipeline rehabilitation method in which a lining member is wound in a spiral shape in a manhole to produce a helical pipe, and the helical pipe is then fed into an existing pipe,
the lining member; and a connecting member attached to an outer surface side of the spirally wound lining member to connect adjacent side edge portions of the lining member,
The lining member is
a strip-shaped lining base having one main surface that constitutes the inner surface of the helical tube; and a first fitting portion formed on each of both side portions of the other main surface of the lining base,
The connecting member is
A strip-shaped connecting base,
a second fitting portion formed on one main surface of the connecting base and fitted into the first fitting portion;
A pipe rehabilitation member comprising: a pair of retaining portions formed on the other main surface of the connecting base and arranged at a predetermined interval in the width direction of the connecting base; and a reinforcing member held by the pair of retaining portions on the other main surface side of the connecting base. The pipe rehabilitation member according to claim 1, wherein the reinforcing member is a strip-shaped metal member. The pipe rehabilitation member according to claim 1 or 2, wherein the tips of the pair of retaining parts are located at the outermost part in the radial direction of the helical pipe when the helical pipe is formed by connecting the adjacent side edges of the lining member with the connecting member. A pipe rehabilitation member according to any one of claims 1 to 3, wherein each of the pair of retaining portions is formed on both side edges of the other main surface of the connecting base.

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