Pipeline Regeneration Method

Abstract

To provide a conduit line renovation method capable of disseminating a filler over all around the outer surface of a conduit line.SOLUTION: According to this conduit tube renovation method, a support member 122 that is a long-sized member having a predetermined outer dimension is applied over its entire length along a lower inner surface of an existing tube 100. Next, while forming a spiral tube 102 by winding a lining member 12 in spiral in a start side manhole 110, it is sequentially sent into the existing tube to install the spiral tube in the existing tube. After that, a filler is filled between an inner surface of the existing tube and an outer surface of the spiral tube.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a pipeline rehabilitation method for rehabilitating an existing pipe by using a helical pipe produced by winding a lining member in a spiral shape. [Background technology]

[0002] An example of a conventional pipeline rehabilitation method is disclosed in Patent Document 1. In the pipeline rehabilitation method of Patent Document 1, a lining member (belt-shaped member) with joints formed on both side edges is pulled into a manhole from above ground, and a pipe-making machine installed in the manhole is used to spirally wind the lining member and join adjacent joints to make a helical pipe (rehabilitated pipe). The helical pipe thus made is then constructed in the existing pipe by sequentially feeding the helical pipe into the existing pipe. After constructing the helical pipe in the existing pipe, a filler (backfilling material) is filled between the inner surface of the existing pipe and the outer surface of the helical pipe, and a rehabilitated pipe (composite pipe) is formed in which the existing pipe and the helical pipe are integrated by the filler. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-105658 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology of Patent Document 1, the spiral pipe is placed on the bottom of the existing pipe, making it difficult for the filler material to reach the underside of the spiral pipe, and there is a risk that a gap will remain between the inner surface of the existing pipe and the outer surface of the spiral pipe.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS Therefore, a primary object of the present invention is to provide a novel pipe rehabilitation member.

[0006] Another object of the present invention is to provide a pipeline rehabilitation method capable of properly spreading filler material around the entire outer periphery of a helical pipe. [Means for solving the problem]

[0007] The first invention is a pipeline rehabilitation method for rehabilitating an existing pipeline by using a helical pipe produced by winding a lining member in a helical shape, comprising: (a) A first long member having a predetermined outer dimension in a radial direction of the existing pipe when installed in the existing pipe, Along the inner lower part of the existing pipe over the entire length of the existing pipe To (b) after step (a), winding the lining member in a spiral shape inside the manhole and connecting adjacent side edges of the lining member to form a spiral pipe, and sequentially feeding the formed spiral pipe from inside the manhole into the existing pipe to install the spiral pipe inside the existing pipe; and (c) after step (b), filling a filler material between the inner surface of the existing pipe and the outer surface of the spiral pipe. and after step (b) and before step (c), further including a step of installing a second elongated member having a predetermined outer dimension in a radial direction of the existing pipe when installed in the existing pipe between an upper portion of the inner surface of the existing pipe and an upper portion of the outer surface of the spiral pipe so as to extend over the entire length of the existing pipe. This is a pipeline rehabilitation method.

[0008] In the first invention, an existing pipe is rehabilitated with a helical pipe formed using a lining member. First, in step (a), a first long member having a predetermined outer dimension is installed over the entire length of the existing pipe so as to follow the lower inner surface of the existing pipe. Next, in step (b), a helical pipe is installed in the existing pipe. Here, the lining member is wound in a helical shape in the manhole, and adjacent side edges of the lining member are connected to form the helical pipe, while the formed helical pipe is fed from the manhole into the existing pipe one after another. At this time, the first long member supports the helical pipe from below and acts as a guide rail, thereby reducing the insertion resistance of the helical pipe. Then, in step (c), a filler is filled between the inner surface of the existing pipe and the outer surface of the helical pipe. At this time, the first long member causes the spiral pipe to be slightly raised (a gap is created) from the bottom of the existing pipe, which makes it easier for the filler to flow around to the underside of the spiral pipe. Furthermore, after step (b) and before step (c), a second elongated member having a predetermined outer dimension is installed between an upper portion of the inner surface of the existing pipe and an upper portion of the outer surface of the helical pipe, so as to extend over the entire length of the existing pipe.

[0009] According to the first aspect of the present invention, since the first long member having a predetermined outer dimension is disposed between the lower part of the inner surface of the existing pipe and the lower part of the outer surface of the helical pipe, the filler material can easily flow around the underside of the helical pipe and can be distributed around the entire outer surface of the helical pipe without any gaps. Therefore, a rehabilitated pipe can be formed in which the existing pipe and the helical pipe are firmly integrated by the filler material.

[0010] Furthermore, since the first elongated member functions as a guide rail when installing the helical tube, the insertion resistance of the helical tube can be reduced. Furthermore, before the filling material is installed, a second long member having a specified outer dimension is installed between the upper part of the inner surface of the existing pipe and the upper part of the outer surface of the spiral pipe, thereby appropriately suppressing or preventing the spiral pipe from floating up due to the filling material.

[0011] A second invention is dependent on the first invention, and in the step (b), a linear body is used as the first elongated member.

[0012] According to the second invention, the first long member can be easily installed along the lower part of the inner surface of the existing pipe, and the spiral pipe can be easily installed after the installation of the first long member.

[0013] The third invention is dependent on the first or second invention, and in step (a), a connecting member is attached to the outer surface side of the spirally wound lining member to connect adjacent side edge portions of the lining member to form a spiral pipe.

[0014] According to the third invention, since the connecting member is attached to the lining member from the outer surface side of the lining member, it is easy to manufacture a helical pipe even with a relatively small diameter, and it is possible to appropriately rehabilitate an existing medium-diameter pipe that is difficult for workers to enter inside. Also, since the helical pipe is formed using two members, the lining member and the connecting member, it is easy to match the circumferential lengths of adjacent lining members, and it is possible to appropriately form a helical pipe with a uniform diameter over the entire axial length.

[0017] No. 4 The invention is Any of 1 to 3 According to the present invention, the outer dimension of the first elongated member is set to be the same as or smaller than the outer dimension of the second elongated member. Effect of the Invention

[0018] According to this invention, the first long member having a predetermined outer dimension is disposed between the lower part of the inner surface of the existing pipe and the lower part of the outer surface of the helical pipe, so that the filler can easily go around the underside of the helical pipe and can be spread without gaps around the entire circumference of the outer surface of the helical pipe. Therefore, the existing pipe and the helical pipe can be firmly integrated by the filler. In addition, the first long member functions as a guide rail during construction of the helical pipe, so that the insertion resistance of the helical pipe can be reduced.

[0019] The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic diagram showing a state in which an existing pipe is rehabilitated by a pipe rehabilitation method according to one embodiment of the present invention; FIG. [Diagram 2] 1 is a diagram showing how a spiral pipe is formed using a pipe rehabilitation member; FIG. [Diagram 3] 3 is a perspective view showing an example of a lining member provided in the pipe rehabilitation member of FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view showing the lining member of FIG. [Diagram 5] 3 is a perspective view showing an example of a connecting member provided in the pipe rehabilitation member of FIG. 2. [Figure 6] FIG. 6 is a cross-sectional view showing the connecting member of FIG. 5. [Figure 7] 6 is a cross-sectional view showing a state in which side edge portions of the lining member shown in FIG. 3 are connected to each other using the connecting member shown in FIG. 5. [Figure 8] 6 is a cross-sectional view showing a connecting portion between the lining member in FIG. 3 and the connecting member in FIG. 5. [Figure 9] FIG. 2A is a schematic diagram showing one step of the pipeline rehabilitation method of FIG. 1, and FIG. 2B is a cross-sectional view of FIG. 2A cut in a direction perpendicular to the axis of the existing pipe. [Figure 10]FIG. 2 is a schematic diagram showing another process of the pipe rehabilitation method of FIG. 1. [Figure 11] FIG. 2A is a schematic diagram showing still another step of the pipeline rehabilitation method of FIG. 1, and FIG. 2B is a cross-sectional view of FIG. 2A cut in a direction perpendicular to the axis of the existing pipe. [Figure 12] FIG. 2 is a cross-sectional view showing an existing pipe being rehabilitated using the pipe rehabilitation method of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Referring to FIG. 1, a pipeline rehabilitation method according to an embodiment of the present invention is a pipeline rehabilitation method of a push-in type in which an existing pipe 100 is rehabilitated by a helical pipe 102 (lining pipe). As will be described in detail later, in this pipeline rehabilitation method, the lining member 12 is wound in a helical shape in a starting manhole 110 to manufacture the helical pipe 102, while the manufactured helical pipe 102 is fed sequentially into the existing pipe 100. To form the helical pipe 102, a pipe rehabilitation member 10 composed of the lining member 12 and a connecting member 14 that connects the side edges of the lining member 12 is used. Then, in this pipeline rehabilitation method, after the helical pipe 102 is installed in the existing pipe 100, a filler 104 is filled between the existing pipe 100 and the helical pipe 102 to form a rehabilitated pipe 106 (see FIG. 12) in which the existing pipe 100 and the helical pipe 102 are integrated.

[0022] The pipe rehabilitation method according to the present invention can be used to rehabilitate various existing pipes 100 made of reinforced concrete, synthetic resin, metal, etc., and is particularly suitable for rehabilitating sewer pipes with a medium diameter of 300 mm to 1000 mm, which are difficult for workers to enter and work inside. In this embodiment, a description will be given assuming that a sewer pipe with a diameter (inner diameter) of 450 mm is constructed. However, this pipe rehabilitation method can also be used to rehabilitate existing pipes 100 with a diameter exceeding 1000 mm.

[0023] First, prior to a specific description of the pipeline rehabilitation method, an example of the pipe rehabilitation member 10 used in this embodiment will be described. As shown in Fig. 2, the pipe rehabilitation member 10 includes a long strip-shaped lining member 12 and a long strip-shaped connecting member 14 that connects adjacent side edges of the lining member 12 wound in a spiral shape.

[0024] The lining member 12 in this embodiment has an engaging portion (first engaging portion 22) with the connecting member 14 on the outer surface side when wound in a spiral shape, and the connecting member 14 is attached to the lining member 12 from the outer surface side of the lining member 12 wound in a spiral shape. The outer diameter of the helical pipe 102 formed using the pipe rehabilitation member 10 is set to a size slightly smaller than the bore (inner diameter) of the existing pipe 100. The configurations of the lining member 12 and the connecting member 14 will be specifically described below.

[0025] 3 and 4, the lining member 12 is a long member that is a main component of the helical pipe 102, and includes a strip-shaped substrate 20 (lining substrate). One main surface 20a of the substrate 20 is a surface that constitutes the inner surface of the helical pipe 102, and is a smooth surface. The width of the substrate 20 is, for example, 75 mm, and the thickness (wall thickness) of the substrate 20 is, for example, 2.5 mm.

[0026] 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, first fitting portions 22 are formed to fit with second fitting portions 52 of the connecting member 14 described later. The first fitting portions 22 include 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 interval from the first engagement portion 24, on the inner side in the width direction of the base 20 than the first engagement portion 24.

[0027] The first engagement portion 24 is a portion that engages with a second engagement portion 54 of the connecting member 14, which will be described later. The 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 the 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.

[0028] 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. The third engagement portion 26 has a third ridge 32 extending in the longitudinal direction of the base body 20. A third locking piece 34 is formed at the tip of one side surface 32a of the third ridge 32 (the inner surface in the width direction of the base body 20). In addition, an inclined surface is formed at the tip of the other side surface 32b of the third ridge 32, which inclines inward in the width direction of the base body 20 as it moves away from the base body 20.

[0029] Further, in the center of the width of the base 20, a displacement absorbing section 36 is formed by loosening a part of the base 20 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 walls 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 tip ends of the side walls 38 to each other. 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.

[0030] Since the base body 20 has the displacement absorbing portion 36, the helical pipe 102 formed by 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 helical pipe 102 is fed into the existing pipe 100 as described later, the deformation of the displacement absorbing portion 36 allows the helical 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 connection member 14 is appropriately maintained. In addition, the gap 42 between the base ends of the displacement absorbing portion 36 allows the displacement absorbing portion 36 to shrink in the width direction. Furthermore, by forming the side wall portion 38 of the displacement absorbing portion 36 so that it widens in the width direction as it moves away from the one main surface 20 a, the outer surface in the width direction of the side wall portion 38 also functions as an anchor portion for the filler 104 .

[0031] Such a lining member 12 is integrally formed 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 of a polyolefin resin such as polyethylene resin and polypropylene resin. The lining member 12 of this embodiment is formed of high-density polyethylene resin.

[0032] By forming the lining member 12 from a polyolefin resin such as polyethylene resin, it becomes 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, it is possible to appropriately form a helical pipe 102 having a size (i.e., a relatively small diameter) corresponding to the existing pipe 100 having a medium diameter of 300 mm or more and 1000 mm or less. Furthermore, the displacement absorbing portion 36 becomes easily deformed, and the helical pipe 102 can easily follow the displacement during construction and earthquakes. In addition, since polyolefin resins have excellent abrasion resistance and chemical resistance, the durability of the helical pipe 102, such as abrasion resistance and chemical resistance, is also improved by forming the lining member 12 constituting the inner surface of the helical pipe 102 from a polyolefin resin.

[0033] 5 and 6, the connecting member 14 is a long member for connecting side edges of the lining member 12, and includes a connecting member main 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 disposed on the outer surface side of the helical pipe 102 and not exposed on the inner surface side of the helical pipe 102 in a state in which the helical pipe 102 is formed using the lining member 12 and the connecting member 14.

[0034] The connecting member body 16 includes a strip-shaped base body 50 (connecting base body). The width of the base body 50 is, for example, 37 mm, and the thickness of the base body 50 is, for example, 3 mm.

[0035] 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 with the first fitting portion 22 of the lining member 12 is formed on this 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 and at a predetermined interval from the fourth engagement portion 56.

[0036] 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 with 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 with the third locking piece 34 of the lining member 12 is formed at the tip of one side surface 62a of this fourth ridge 62 (the inner surface in the width direction of the base 50).

[0037] Furthermore, on one main surface 50a of the base body 50, between the second engaging portion 54 and the fourth engaging portion 56 and between the second engaging portions 54, a water stopping portion 66 formed in a band shape from an elastic body such as an elastomer is provided. When the first fitting portion 22 of the lining member 12 and the second fitting portion 52 of the connecting member 14 are fitted together, the water stopping portion 66 is sandwiched between the one main surface 50a of the base body 50 and the tips of the first engaging portion 24 and the third engaging portion 26 of the lining member 12, and is sufficiently compressed (see FIG. 8). This ensures watertightness at the connecting portions between the side edges of the lining member 12.

[0038] 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.

[0039] 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 portions 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.

[0040] Furthermore, the tip of the holding portion 70 is the portion that comes into contact with the inner surface of the existing pipe 100 when the helical pipe 102 is fed into the existing pipe 100, as described below. By forming the holding portion 70 on both side edges of the other main surface 50b of the base 50, the tip of the holding 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 body 16 (the thickness from the tip of the second fitting portion 52 to the tip of the holding portion 70) is, for example, 13 mm.

[0041] The other main surface 50b 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 helical pipe 102 (the portion where the side edges of the lining member 12 are connected to each other by the connecting member 14) can be increased, and the rigidity of the helical 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.

[0042] In such a connecting member 14, the connecting member body 16 is integrally formed by extrusion molding of a 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, the connecting member body 16 is preferably formed of a synthetic resin such as hard polyvinyl chloride resin having a higher 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 connecting member body 16 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 connecting member body 16 is manufactured.

[0043] By forming the connecting member body 16 from a rigid polyvinyl chloride resin having a high strength, the rigidity of the entire spiral pipe 102 formed 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 the 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 obtained. In addition, rigid polyvinyl chloride resin has higher adhesion to water-stopping materials than polyolefin resin.

[0044] As shown in Figures 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 against each other so that the main surfaces 20a of the bases 20 of the lining member 12 are flush with each other. Then, the connecting member 14 is pressed into 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 into the first fitting portion 22 of the lining member 12 in the longitudinal direction. 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.

[0045] In this embodiment, the connecting member 14 is attached from the outer surface side of the spirally wound lining member 12, so that it is easy to manufacture 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 or more and 1000 mm or less, for which pipe manufacturing work would be difficult with a pipe rehabilitation member in which the connecting member is attached from the inner surface side of the lining member.

[0046] Furthermore, since the helical pipe 102 is formed using two members, the lining member 12 and the connecting member 14, after the lining member 12 is rotated and positioned, the side edge portions of the lining member 12 can be connected and fixed to each other by the connecting member 14. Therefore, when forming the helical pipe 102, it is easy to match the circumferential lengths (diameters) of adjacent lining members 12, and a helical pipe 102 with a uniform diameter over the entire axial length can be formed.

[0047] Furthermore, in a state where the side edges of the lining members 12 are connected to each other by the connecting members 14, i.e., in a state where 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 to the inner surface of the helical pipe 102. This reduces the number of seams that appear on the inner surface of the helical pipe 102, 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 to the inner surface of the helical pipe 102, the durability of the helical pipe 102, such as abrasion resistance and chemical resistance, is also improved.

[0048] In addition, in a state where 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 about the side edges of the base bodies 20, and the second locking pieces 60 of the connecting member 14 face inward from each other about the side edges of the base bodies 20. In other words, in 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 engaging portion 54 of the connecting member 14. Therefore, a force is applied to the lining members 12 in a direction in which the side edges of the adjacent base bodies 20 approach each other (in a direction in which they come into close contact) due to the engagement between the first engaging portion 24 and the second engaging 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.

[0049] 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 a direction in which the side edges of the adjacent bases 20 approach 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 with each other.

[0050] 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 force against 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, the deformation of the connecting portion (the first fitting portion 22 and the second fitting 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, that is, the entire member can be made uniform in thickness, making it easy to mold.

[0051] 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 with each other, 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 a tilting allowance for the first engagement portion 24. Therefore, the force (pushing force) required to engage the first engagement portion 24 with the second engagement portion 54 can be reduced, making it easier to attach the connecting member 14 to the lining member 12.

[0052] Similarly, in a state in which 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 side of the third protrusion 32. When the third engagement portion 26 and the fourth engagement portion 56 are engaged with each other, the third engagement portion 26 mainly elastically deforms and tilts toward the other side surface 32b side, but the presence of the gap 82 ensures a tilting margin for the third engagement portion 26. Therefore, the force required to engage the third engagement portion 26 with the fourth engagement portion 56 can be reduced, making it easier to attach the connecting member 14 to the lining member 12.

[0053] Furthermore, in a state in which 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 part in the radial direction of the helical pipe 102. In other words, the tips of the holding parts 70 are located radially outward from the outer surfaces of the connecting parts 40 of the displacement absorbing parts 36 of the lining member 12 and the outer surfaces of the reinforcing members 18. Therefore, when the helical pipe 102 is fed into the existing pipe 100, the tips of the holding parts 70 come into sliding contact with the inner surface of the existing pipe 100 (mainly the support members 122 (see FIG. 9) in this embodiment), and the lining member 12 does not or hardly comes into sliding contact with the inner surface of the existing pipe 100, so that the connecting member 14 can appropriately protect the lining member 12 (particularly the displacement absorbing parts 36). Furthermore, since the metallic reinforcing member 18 does not come into sliding contact with the inner surface of the existing pipe 100 or does not easily come into sliding contact with it, damage to the inner surface of the existing pipe 100 by the reinforcing member 18 can be prevented.

[0054] Furthermore, when the helical 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 helical pipe 102. This reduces the insertion resistance of the helical pipe 102 and reduces damage to the helical pipe 102 caused by sliding contact with the existing pipe 100. In this embodiment, the connecting member body 16 is made of rigid polyvinyl chloride resin with high strength, so that the effect of protecting the lining member 12 and the effect of reducing damage to the helical pipe 102 are more appropriately exhibited.

[0055] Next, a pipe rehabilitation method according to one embodiment of the present invention will be specifically described with reference to Figures 1 and 9 to 11. In this embodiment, an existing pipe 100 between a starting manhole 110 and a destination manhole 112 is to be rehabilitated.

[0056] When rehabilitating an existing pipe 100, first, preparations are made before pipe making, as shown in Fig. 9. That is, a pipe making machine 114 is installed inside a 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 preferably be prepared and installed individually wound into rolls. The inside of the existing pipe 100 is previously cleaned using a high-pressure washer or the like.

[0057] In parallel with the preparation of the pipe rehabilitation member 10, the drop wire 120 and the support member 122 are installed in the existing pipe 100. That is, the drop wire 120 is installed along the entire length of the rehabilitation section of the existing pipe 100 (that is, from the departure side manhole 110 to the arrival side manhole 112) so as to follow the upper part of the inner surface of the existing pipe 100. In addition, the support member 122 is installed along the entire length of the rehabilitation section of the existing pipe 100 so as to follow the lower part of the inner surface of the existing pipe 100.

[0058] The drop wires 120 are long members for pulling the pressing members 124 described later into the existing pipe 100, and are installed in the existing pipe 100 in a number corresponding to the number of pressing members 124 at positions corresponding to the positions of the pressing members 124. In this embodiment, a total of three drop wires 120 are installed at the top of the existing pipe 100 and on both sides thereof. The outer dimensions of the drop wires 120 are preferably set to a size smaller than the gap formed between the inner surface of the existing pipe 100 and the outer surface of the helical pipe 102 at the position of the drop wires 120. This is to prevent the drop wires 120 from interfering (resisting) when the helical pipe 102 is inserted into the existing pipe 100. In this embodiment, a steel wire (wire rope) having an outer dimension (wire diameter; diameter of circumscribed circle) of 3 mm is used. In addition, after the service line 120 is inserted into the existing pipe 100, it is advisable to fix both ends of the service line 120 to the starting side manhole 110 and the arrival side manhole 112, etc., while applying a predetermined tension to the service line 120 so that it does not sag within the existing pipe 100.

[0059] The support member 122 is a long member (first long member) that supports the helical tube 102 from below in a state in which the helical tube 102 is slightly raised from the bottom of the existing pipe 100, and has a predetermined outer diameter and a load-bearing strength (flattening strength) capable of supporting the helical tube 102. The outer diameter of the support member 122 is preferably set to be the same as or smaller than the outer diameter of the pressing member 124, for example, set to 2 mm to 10 mm. The number of the support members 122 is preferably 1 to 3, and is particularly preferably 2 in consideration of the balance of supporting the helical tube 102. Furthermore, the position of the support member 122 is preferably within an angle range of 90 degrees with the line Y extending vertically downward from the axial center X of the existing pipe 100 as the center line (center), that is, up to a position where the central angle θ1 with the line Y is 45 degrees. In this embodiment, a linear member, specifically a piano wire having an outer dimension (outer diameter) of 3 mm is used as the support member 122, and a total of two support members 122 are provided at positions where the central angle θ1 with the wire Y is 25 degrees clockwise and counterclockwise. After the support member 122 is inserted into the existing pipe 100, both ends of the support member 122 are preferably fixed to the starting manhole 110 and the arrival manhole 112, etc., while applying a predetermined tension to the support member 122 so that the support member 122 does not shift when the spiral pipe 102 is inserted.

[0060] After the preparation process before pipe making is completed, the helical pipe 102 is then installed in the existing pipe 100 as shown in FIG. 1. Specifically, 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. In the pipe making machine 114, the lining member 12 is wound in a helical shape by butting the side edges of the base 20 of the lining member 12 together, and the connecting member 14 is attached from the outer surface side of the lining member 12 to connect the adjacent side edges of the lining member 12 together, thereby making the helical pipe 102. As described above, the outer diameter of the helical pipe 102 formed using the pipe rehabilitation member 10 is set to a size slightly smaller than the inner diameter of the existing pipe 100. In this embodiment, the inner diameter of the existing pipe 100 is 450 mm, whereas the helical pipe 102 having an outer diameter of 444 mm (inner diameter of 410 mm) is formed. Then, the helical pipe 102 formed using the pipe making machine 114 is sequentially fed from inside the starting manhole 110 into the existing pipe 100. At this time, the support member 122 supports the helical pipe 102 from below and functions as a guide rail, thereby reducing the insertion resistance of the helical pipe 102.

[0061] After the spiral pipe 102 is installed over the entire length of the rehabilitated section of the existing pipe 100, a pressing member 124 is then installed between an upper part of the inner surface of the existing pipe 100 and an upper part of the outer surface of the spiral pipe 102 over the entire length of the rehabilitated section of the existing pipe 100. Specifically, as shown in Fig. 10, a pressing member 124 is connected to one end of each drop wire 120, and the drop wires 120 are pulled from the other end, thereby replacing each drop wire 120 with the pressing member 124. As a result, as shown in Fig. 11, the pressing member 124 is installed over the entire length of the rehabilitated section of the existing pipe 100.

[0062] The pressing member 124 is a long member (second long member) that is sandwiched between the upper part of the inner surface of the existing pipe 100 and the upper part of the outer surface of the helical pipe 102 to press down the helical pipe 102 from above, and has a predetermined outer diameter and a load-bearing strength capable of pressing down the helical pipe 102. The outer diameter of the pressing member 124 is preferably set to be equal to or slightly larger than the gap formed between the inner surface of the existing pipe 100 and the outer surface of the helical pipe 102 at the arrangement position, and is set to, for example, 5 mm to 20 mm. The number of pressing members 124 is preferably 1 to 4, and particularly preferably 2 or 3 in consideration of effectively pressing down the helical pipe 102 from above. Furthermore, the arrangement position of the pressing member 124 is preferably within an angle range of 120° with the line Z extending vertically upward from the axial center X of the existing pipe 100 as the center line, that is, up to a position where the central angle θ2 with the line Z is 60°. In this embodiment, a linear member, specifically a steel wire (wire rope) having an outer dimension (wire diameter; diameter of circumscribed circle) of 10 mm is used as the pressing member 124, and a total of three pressing members 124 are provided at positions where the central angle θ2 between the pipe top of the existing pipe 100 and the line Z is 25 degrees clockwise and counterclockwise.

[0063] After the pressing member 124 is installed, the filler 104 is injected between the inner surface of the existing pipe 100 and the outer surface of the spiral pipe 102 from the pipe end of the existing pipe 100. At this time, the spiral pipe 102 is pressed downward over its entire length by the pressing member 124, so that a space for injecting the filler 104 is appropriately secured, and the floating of the spiral pipe 102 due to the buoyancy of the filler 104 is appropriately suppressed or prevented. Therefore, the spiral pipe 102 can appropriately secure a predetermined pipeline gradient. In addition, the support member 122 causes the spiral pipe 102 to be slightly raised from the bottom of the existing pipe 100 (with a gap of about 3 mm), so that the filler 104 can easily go around the underside of the spiral pipe 102, and the filler 104 can be spread without gaps over the entire circumference of the outer surface side of the spiral pipe 102. Therefore, the existing pipe 100 and the helical pipe 102 can be firmly integrated with each other by the filling material 104. The supporting member 122 and the pressing member 124 are embedded in the filling material 104 as they are.

[0064] Then, as the filler material 104 solidifies, a rehabilitating pipe 106 (composite pipe) is formed in which the existing pipe 100 and the spiral pipe 102 are integrated, as shown in Fig. 12. At this time, the support member 122 and the pressing member 124, which are long metallic members, are embedded in the filler material 104 over the entire longitudinal length of the rehabilitating pipe 106, so that the strength of the filler material 104 (particularly the strength in the tensile direction) is increased, and thus the strength of the rehabilitating pipe 106 can be increased. Thereafter, the rehabilitating work of the existing pipe 100 is completed by appropriately carrying out tidying up work and the like.

[0065] As described above, according to this embodiment, the support member 122 having a predetermined outer dimension is disposed between the lower inner surface of the existing pipe 100 and the lower outer surface of the helical pipe 102, so that the filler material 104 can easily reach the underside of the helical pipe 102 and can be spread without gaps around the entire outer surface of the helical pipe 102. Therefore, the filler material 104 can form a rehabilitated pipe 106 in which the existing pipe 100 and the helical pipe 102 are firmly integrated with each other.

[0066] In addition, since the support member 122 functions as a guide rail when the helical tube 102 is installed, the insertion resistance of the helical tube 102 can be reduced.

[0067] Furthermore, since a linear body is used as the support member 122, the support member 122 can be easily installed along the lower part of the inner surface of the existing pipe 100, and the spiral pipe 102 can be easily installed after the support member 122 is installed.

[0068] Furthermore, since the pressing member 124 having a predetermined outer dimension is placed between the upper part of the inner surface of the existing pipe 100 and the upper part of the outer surface of the helical pipe 102 before the filling material 104 is applied, it is possible to appropriately suppress or prevent the helical pipe 102 from floating up due to the filling material 104. Therefore, it is possible to appropriately ensure that the helical pipe 102 (and thus the rehabilitated pipe 106) has a predetermined pipeline gradient.

[0069] In the above embodiment, a piano wire is used as the support member 122, which is the first long member, but there are no particular limitations on the material and cross-sectional shape of the support member 122 as long as it has a predetermined load-bearing strength capable of supporting the helical tube 102 without being flattened (or only being slightly flattened). Also, the support member 122 does not necessarily have to be a linear body, and may be, for example, a band-shaped body.

[0070] Similarly, a steel wire (wire rope) is used as the second long member, the pressing member 124, but the material and cross-sectional shape of the pressing member 124 are not particularly limited as long as it has a predetermined load-bearing strength capable of pressing down the helical tube 102 without flattening (or only slightly flattening). For example, a cement-filled tube made by injecting cement milk into a resin tube such as nylon and allowing it to harden can also be used as the pressing member 124. When using a cement-filled tube, it is preferable to insert a resin tube between the upper inner surface of the existing pipe 100 and the upper outer surface of the helical tube 102, and then fill the tube with cement milk and allow it to harden. In addition, the pressing member 124 does not necessarily have to be a linear body, and may be, for example, a band-shaped body.

[0071] Furthermore, the specific configuration and shape of the above-mentioned pipe rehabilitation member 10 (the lining member 12 and the connecting member 14) can be changed as appropriate.

[0072] For example, in the above embodiment, the lining member 12 has two engagement portions (the first engagement portion 24 and the third engagement portion 26) as an engagement portion (the first engagement portion 22) with the connecting member 14, but the number of engagement portions may be one. Similarly, the connecting member main body 16 of the connecting member 14 has two engagement portions (the second engagement portion 54 and the fourth engagement portion 56) as an engagement portion (the second engagement portion 52) with the lining member 12, but the number of engagement portions may be one. In addition, of the engagement portions formed on the lining member 12 and the connecting member 14, one engagement portion may be formed in a groove shape, and the other engagement portion may be formed in a protrusion shape that is fitted into the groove.

[0073] In the above embodiment, the reinforcing member 18 is held between the pair of holding portions 70 of the connecting member 14 so that the reinforcing member 18 does not protrude radially outward beyond the tip of the holding portion 70, but this is not limiting. The reinforcing member 18 may be held on the radial outer surface side of the holding portion 70. The reinforcing member 18 does not necessarily have to be provided on the connecting member 14. Furthermore, instead of providing the reinforcing member 18, or in addition to providing the reinforcing member 18, an anchor portion having a T-shaped cross section or the like extending in the longitudinal direction of the base body 50 may be formed on the other main surface 50b of the base body 50.

[0074] Furthermore, although not provided in the above embodiment, a reinforcing member may be attached to the outer surface side (the other main surface 20b side) of the lining member 12 in order to increase rigidity.

[0075] Furthermore, in the above embodiment, the gap 42 is formed between the base ends of the displacement absorbing parts 36 of the lining member 12, but this gap 42 does not necessarily have to be formed. Also, a thin film part connecting the one main surfaces 20a of the base body 20 to each other may be integrally molded so as to cover the gap 42, or the thin film part may be attached later. Furthermore, the lining member 12 does not necessarily have to include the displacement absorbing part 36, and instead of or together with the displacement absorbing part 36, an anchor part having a T-shaped cross section extending in the longitudinal direction of the base body 20 may be formed on the other main surface 20b of the base body 20.

[0076] In the above embodiment, a push-type pipeline rehabilitation method in which the spiral pipe 102 is rotated while being fed into the existing pipe 100 is exemplified, but the invention is not limited to this. The pipeline rehabilitation method according to the present invention may be a towing type pipeline rehabilitation method in which the spiral pipe 102 manufactured in the starting manhole 110 is pulled from the arrival manhole 112 side by a winch or the like to feed the spiral pipe 102 into the existing pipe 100 without rotating it.

[0077] Furthermore, in the above-mentioned embodiment, a pipe rehabilitation member 10 in which the connecting members 14 are attached from the outer surface side of the lining member 12 has been exemplified, but the pipe rehabilitation member 10 may be one in which the connecting members 14 are attached from the inner surface side of the lining member 12. Also, the side edges of the lining member 12 do not necessarily need to be connected using the connecting members 14, and a pipe rehabilitation member 10 in which the side edges of the lining members 12 are directly connected to each other may also be used.

[0078] Note that the specific values ​​of the dimensions and the like given above are merely examples and can be changed as appropriate according to the needs of the product specifications, etc. [Explanation of symbols]

[0079] 10...Pipe rehabilitation materials 12 ... Lining material 14 ...Connecting member 100 … Existing pipe 102 …Spiral tube 104…Filling material 106 … Rehabilitation pipe 120 ... siding 122 ... Support member (first long member) 124 ... Pressing member (second long member)

Claims

1. A pipeline rehabilitation method for rehabilitating an existing pipe using a helical pipe produced by winding a lining member in a spiral shape, comprising: (a) installing a first elongated member, the first elongated member having a predetermined outer dimension in a radial direction of the existing pipe when installed in the existing pipe, along a lower part of an inner surface of the existing pipe and over an entire length of the existing pipe; (b) after the step (a), a step of winding the lining member in a spiral shape in the manhole and connecting adjacent side edge portions of the lining member to form the spiral pipe, and sequentially feeding the formed spiral pipe from the manhole into the existing pipe, thereby constructing the spiral pipe into the existing pipe; and (c) after the step (b), a step of filling a gap between the inner surface of the existing pipe and the outer surface of the spiral pipe with a filler material; The pipeline rehabilitation method further includes, after step (b) and before step (c), a step of installing a second long member, the second long member having a predetermined outer dimension in the radial direction of the existing pipe when installed within the existing pipe, between an upper portion of the inner surface of the existing pipe and an upper portion of the outer surface of the spiral pipe, so as to extend over the entire length of the existing pipe.

2. A pipeline rehabilitation method as described in claim 1, wherein in step (b), a linear body is used as the first long member.

3. 3. A pipeline rehabilitation method according to claim 1 or 2, wherein in step (a), a connecting member is attached to the outer surface side of the spirally wound lining member to connect adjacent side edge portions of the lining member to form the spiral pipe.

4. The pipeline rehabilitation method according to claim 1 , wherein the outer dimensions of the first elongated member are set to be the same as or smaller than the outer dimensions of the second elongated member.

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