Strip-shaped member for rehabilitation of existing pipes

Abstract

Provided is a strip-shaped member for existing pipe rehabilitation capable of assuring the required rigidity and capable of suppressing cross-sectional deformation due to curvature imparting during pipe manufacture. A spiral, tubular rehabilitation pipe 9 lined on the inner circumference of an existing pipe 1 is constituted of a strip-shaped member for existing pipe rehabilitation 10 made of a synthetic resin. The strip-shaped member 10 includes a strip portion 11 that constitutes a pipe wall portion 9a on the inner peripheral side of the rehabilitation pipe 9, a first fitting portion 13 at one end in the width direction, a second fitting portion 14 at the other end in the width direction, and a reinforcing protruding portion 20 that protrudes from the middle to the outer peripheral side. The reinforcing protruding portion 20 includes a plurality of hollow cross-sectional portions 21, 22, 23 lined up in the width direction. Hollow portions 29 of adjacent hollow cross-sectional portions are separated from each other by isolating portions 30. Each hollow cross-sectional portion 21, 22, 23 has a top plate portion 25 that constitutes a pipe wall portion on the outer peripheral side of the rehabilitation pipe 9.

Description

Technical Field

[0001] The present invention relates to a strip member for rehabilitating an aged existing pipe, and more particularly to a synthetic resin strip member that constitutes a spiral tubular rehabilitation pipe lined on the inner circumference of the existing pipe.

Background Art

[0002] A method of rehabilitating an existing pipe by lining a rehabilitation pipe on the inner circumference of an aged existing pipe such as a sewer pipe is known. The rehabilitation pipe is constituted by, for example, a strip member made of synthetic resin. (See, for example, Patent Documents 1 to 3, etc.).

[0003] This type of strip member includes a flat strip portion, male and female fitting portions, and reinforcing protrusions. The female fitting portion has a fitting groove that opens to the inner peripheral side and bulges from one end portion in the width direction of the strip portion to the outer peripheral side. The male fitting portion has a fitting convex portion that protrudes from the other end portion in the width direction of the strip portion to the outer peripheral side. Here, the inner peripheral side refers to the side facing the radially inner side when it becomes a rehabilitation pipe. The outer peripheral side refers to the side facing the radially outer side when the rehabilitation pipe is formed into a pipe.

[0004] The reinforcing protrusions are provided so as to protrude from the strip portion to the outer peripheral side in the middle of these fitting portions. Generally, the reinforcing protrusions are constituted by a plurality of ribs having a T-shaped cross section. The plurality of ribs are provided side by side at intervals in the width direction of the strip member (see Patent Document 1). The reinforcing protrusions of Patent Document 2 are formed in a square or circular hollow cross-sectional shape. The reinforcing protrusions of Patent Document 3 are formed in an H-shaped cross-sectional shape.

[0005] Such a strip-shaped member is spirally wound along the inner circumference of an existing pipe, and the fitting grooves and fitting protrusions of adjacent male and female fitting portions are fitted together. As a result, a spiral tubular regenerated pipe is formed from the strip-shaped member. An outer peripheral groove that opens to the outer peripheral side is formed between adjacent reinforcing protrusions (ribs) on the outer peripheral portion of the regenerated pipe and between the raised portions of the female fitting portion. Further, an inter-pipe gap is formed between the existing pipe and the regenerated pipe. Usually, these outer peripheral grooves and inter-pipe gaps of the regenerated pipe are filled with a backfill material such as mortar, but there is also a construction method (mortarless) without backfilling.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] During pipe manufacturing, the strip-shaped member undergoes cross-sectional deformation due to the application of curvature. For example, in the strip-shaped member of Patent Document 2, when the top plate portion of the hollow cross-sectional reinforcing protrusion is widened to increase rigidity, it becomes more prone to deformation during pipe manufacturing. In view of such circumstances, an object of the present invention is to provide a strip-shaped member for regenerating an existing pipe that can ensure the required rigidity and suppress cross-sectional deformation due to the application of curvature during pipe manufacturing.

Means for Solving the Problems

[0008] To solve the above problems, the present invention is a strip-shaped member made of a synthetic resin that constitutes a spiral tubular regenerated pipe lined on the inner circumference of an existing pipe, a strip plate portion that constitutes the pipe wall portion on the inner peripheral side of the regenerated pipe, A first fitting portion having a fitting groove that opens to the inner peripheral side and is raised from one end portion in the width direction of the strip portion to the outer peripheral side opposite to the inner peripheral side, A second fitting portion provided so as to protrude from the other end portion in the width direction of the strip portion to the outer peripheral side and including a fitting convex portion that is fitted into the fitting groove of the adjacent first fitting portion when spirally wound, A reinforcing protrusion protruding from the strip portion to the outer peripheral side between the first fitting portion and the second fitting portion, and the reinforcing protrusion includes a plurality of hollow cross-sectional portions arranged in the width direction, and the hollow portions of adjacent hollow cross-sectional portions are separated via a separating portion, and each hollow cross-sectional portion has a top plate portion that constitutes the pipe wall portion on the outer peripheral side of the rehabilitation pipe.

[0009] According to the belt-like member having the above characteristics, since the reinforcing protrusion is divided into a plurality of hollow cross-sectional portions, even when curvature is imparted during pipe manufacturing, cross-sectional deformation of the reinforcing protrusion is suppressed. In particular, a large tensile stress acts on the outer peripheral side portion of the reinforcing protrusion due to the curvature imparted during pipe manufacturing, but since the outer peripheral side portion is divided into a plurality of top plate portions, it is suppressed that the outer peripheral side portion is greatly deformed. Furthermore, by increasing the total area of the top plate portions of the plurality of hollow cross-sectional portions, the rigidity of the belt-like member is increased, and the self-supporting strength of the belt-like member alone is exhibited. As a result, the rehabilitation pipe can be made into a self-supporting pipe.

[0010] It is preferable that the adjacent hollow cross-sectional portions have side plate portions facing each other, and an isolation groove for separating the adjacent hollow cross-sectional portions from each other is formed so as to open to the outer peripheral side between these side plate portions. The isolation portion is constituted by the opposing side plate portions and the isolation groove. The top plate portions of the adjacent hollow cross-sectional portions are separated by the opening of the isolation groove to the outer peripheral side. Thereby, each hollow cross-sectional portion is made independent. For this reason, variations in the rigidity distribution in the belt-like member are suppressed, and the rigidity difference between the first and second fitting portions and the reinforcing protrusion is reduced. Therefore, even if the first and second fitting portions have lower rigidity than the reinforcing protrusion, it is possible to suppress the first and second fitting portions from being greatly deformed in cross section due to the curvature imparted during pipe manufacturing.

[0011] The isolation part has an isolation wall that intersects the strip part and the top plate part, and the top plate parts of the adjacent hollow cross-sectional parts may be integrally connected at the intersection with the isolation wall. One top plate of the reinforcing protrusion is formed by the top plate parts of a plurality of hollow cross-sectional parts. As a result, the rigidity of the strip-shaped member is improved, and the rigidity of the rehabilitation pipe is improved.

[0012] It is preferable that the first hollow cross-sectional part closest to the first fitting part among the hollow cross-sectional parts is integrally connected to the first fitting part, and one side part of the first fitting part constitutes a part of the first hollow cross-sectional part. As a result, the first hollow cross-sectional part and the first fitting part are structurally integrated, and cross-sectional deformation of the first fitting part due to curvature imparting and fitting operation during pipe manufacturing is suppressed. Furthermore, deformation of the second fitting part fitted to the first fitting part is suppressed.

[0013] The first fitting part includes a plurality of raised parts that bulge toward the outer peripheral side and are arranged in the width direction, and each raised part has the fitting groove. It is preferable that the top end part on the outer peripheral side of the first raised part closest to the first hollow cross-sectional part among these raised parts is integrally connected to the top plate part of the first hollow cross-sectional part. As a result, the first hollow cross-sectional part and the first raised part are structurally integrated, and deformation such as tilting of the first raised part due to curvature imparting is suppressed. As a result, the fitting groove of each raised part and the fitting convex part of the second fitting part can be stably fitted. Even if the fitting timing of each raised part is deviated, the deformation of the first raised part is suppressed, so that the fitting groove of each raised part and the fitting convex part of the second fitting part can be surely fitted.

[0014] It is preferable that the dimension in the thickness direction connecting the top plate part and the strip part in each hollow cross-sectional part is larger than the dimension in the width direction in the hollow cross-sectional part. As a result, each hollow cross-sectional part has a vertically long and narrow width structure, and deformation of the top plate part due to curvature imparting during pipe manufacturing is suppressed.

[0015] It is preferable that the hollow cross-sectional portion has a pair of side plate portions with an arcuate cross-section, and the middle portions of these pair of side plate portions face each other or are attached to each other. Thereby, it is possible to prevent the hollow cross-sectional portion from collapsing against the force from the outer peripheral side roller or the like of the pipe manufacturing machine during pipe manufacturing.

[0016] It is preferable that the hollow cross-sectional portion includes a brace portion obliquely bridging the hollow portion. Thereby, it is possible to prevent the hollow cross-sectional portion from collapsing against the force from the outer peripheral side roller or the like of the pipe manufacturing machine during pipe manufacturing.

[0017] In the case of a method (mortarless) in which a backfill material (filler) such as mortar is not filled between the regenerated pipe made of this type of strip member and the existing pipe, the inter-pipe gap between the regenerated pipe and the existing pipe, and the outer peripheral groove that opens to the outer peripheral side in the regenerated pipe remain as void portions. Then, it cannot be said that there is no possibility that earth and sand are drawn into the void portion by groundwater, resulting in ground settlement or road subsidence. In view of such circumstances, in the strip member according to the present invention, the ratio of the cross-sectional area of the outer peripheral groove opened to the outer peripheral side to the apparent cross-sectional area, which is the product of the spiral pitch along the pipe axis of the regenerated pipe made of the strip member and the pipe thickness, is preferably 40% or less, more preferably 30% or less, and still more preferably 20% or less. Thereby, the volume of the void portion can be made as small as possible, and the intrusion flow rate of groundwater can be suppressed to a flow rate at which earth and sand cannot be drawn in. Therefore, the risk of ground settlement or road subsidence due to the drawing in of earth and sand can be reduced. When applied to a method of performing backfill, the required amount of the backfill material can be suppressed, and cost reduction can be achieved.

Effects of the Invention

[0018] According to the strip member for regenerating an existing pipe according to the present invention, the required rigidity can be ensured, and the cross-sectional deformation during curvature application can be suppressed.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

MODE FOR CARRYING OUT THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings. <First Embodiment> As shown in FIG. 1, a spiral tubular rehabilitation pipe 9 is lined on the inner circumference of an aged existing pipe 1. As a result, the existing pipe 1 is rehabilitated. The existing pipe 1 is, for example, a sewer pipe buried underground. The rehabilitation pipe 9 is constructed for each sewer pipe between two manholes 4. Note that the existing pipe 1 to be rehabilitated is not limited to a sewer pipe, and may be a water supply pipe, an agricultural water pipe, a water conduit for hydroelectric power generation, a gas pipe, a tunnel, or the like.

[0021] The rehabilitation pipe 9 is a self-supporting pipe that bears the required strength only by itself without relying on the strength of the existing pipe 1. A backfill material that structurally integrates the two is not filled between the inner circumference of the existing pipe 1 and the rehabilitation pipe 9.

[0022] The rehabilitation pipe 9 is composed of a strip-shaped member 10 (profile) for rehabilitating an existing pipe. The strip-shaped member 10 is spirally wound along the inner circumference of the existing pipe 1 and formed into the rehabilitation pipe 9 which is a spiral pipe. The material of the strip-shaped member 10 is a synthetic resin such as polyvinyl chloride or polyolefin. The strip-shaped member 10 is formed by extrusion molding of the synthetic resin. The strip-shaped member 10 has the rigidity for the rehabilitation pipe 9 to become a self-supporting pipe.

[0023] As shown in FIG. 2, the strip-shaped member 10 includes a strip plate portion 11, a first fitting portion 13, a second fitting portion 14, and a reinforcing protrusion 20, and extends in the longitudinal direction. The cross section orthogonal to the longitudinal direction of the strip-shaped member 10 is formed in a constant shape. That is, the cross-sectional shape is the same at any position in the longitudinal direction of the strip-shaped member 10.

[0024] The strip plate portion 11 is formed in a long flat plate shape with a substantially constant thickness. As shown in FIG. 3, the strip plate portion 11 constitutes the pipe wall portion 9a on the inner peripheral side of the rehabilitation pipe 9.

[0025] As shown in FIG. 2, the first fitting portion 13 is provided at one end in the width direction (the left end portion in FIG. 2) of the strip plate portion 11. The first fitting portion 13 projects outward in the width direction (left in the same figure) from the strip plate portion 11. The first fitting portion 13 includes two (a plurality of) raised portions 15, 16. The raised portions 15, 16 are each formed in a substantially triangular cross section and raised to the outer peripheral side (opposite to the inner peripheral side, upper side in FIG. 2) from the strip plate portion 11. The two raised portions 15, 16 are arranged in the width direction (left and right in FIG. 2) of the strip-shaped member 10.

[0026] The raised portion 16 is directly continuous with the strip plate portion 11. A fitting groove 16a is formed in the raised portion 16. The fitting groove 16a is opened to the inner peripheral side (lower side in FIG. 2) of the raised portion 16. The raised portion 15 is disposed on the outer side in the width direction (the left side in FIG. 2) than the raised portion 16. A fitting groove 15a that opens to the inner peripheral side is formed in the raised portion 15. Two (a plurality of) fitting grooves 15a and 16a are arranged side by side in the width direction and extend in the longitudinal direction of the belt-like member 10, respectively.

[0027] A second fitting portion 14 is provided at the other end in the width direction (the right end in FIG. 2) of the strip plate portion 11. The second fitting portion 14 includes two (a plurality of) fitting convex portions 14a and 14b. The fitting convex portions 14a and 14b are each formed in a substantially arrow-shaped cross-sectional shape and project from the other end portion of the strip plate portion 11 to the outer peripheral side. The two fitting convex portions 14a and 14b are arranged side by side in the width direction and extend in the longitudinal direction of the belt-like member 10, respectively. The fitting convex portion 14b is disposed on the outer side in the width direction (the right side in FIG. 2) than the fitting convex portion 14a. The base portion of the fitting convex portion 14b is constricted to form an easily cuttable portion 14c.

[0028] As shown in FIG. 3, in the regeneration pipe 9, the adjacent fitting portions 13 and 14 of the belt-like member 10 wound in a spiral are fitted to each other. That is, when the belt-like member 10 is wound in a spiral, the fitting convex portion 14a is fitted to the adjacent fitting groove 15a, and the fitting convex portion 14b is fitted to the adjacent fitting groove 16a.

[0029] As shown in FIG. 2, a reinforcing protrusion 20 is provided on the strip plate portion 11 between the first fitting portion 13 and the second fitting portion 14. The reinforcing protrusion 20 projects from the strip plate portion 11 to the outer peripheral side (the upper side in FIG. 2) and extends in the longitudinal direction of the belt-like member 10.

[0030] The reinforcing protrusion 20 includes three (a plurality of) hollow cross-sectional portions 21, 22, and 23. The three hollow cross-sectional portions 21, 22, and 23 are arranged side by side in the width direction (left and right in FIG. 2) of the belt-like member 10.

[0031] Each of the hollow cross-sectional portions 21, 22, and 23 has a top plate portion 25 and a side plate portion 26, and a hollow portion 29 is formed inside, so that it is formed in a substantially rectangular frame-shaped cross-section. The top plate portion 25 is disposed at the top in the protruding direction of the hollow cross-sectional portions 21 and 22. The top plate portion 25 is formed in a plate shape parallel to the strip plate portion 11 and faces the strip plate portion 11 with the hollow portion 29 therebetween. The top surfaces 25a (the surfaces facing the outer peripheral side) of the top plate portions 25 of the three hollow cross-sectional portions 21, 22, and 23 are flush with each other. As shown in FIG. 3, the top plate portion 25 constitutes the pipe wall portion on the outer peripheral side of the regeneration pipe 9.

[0032] As shown in FIG. 2, the side plate portion 26 has a linear cross-sectional shape and is substantially orthogonal (intersects) with the top plate portion 25, connecting the strip plate portion 11 and the top plate portion 25. Each of the hollow cross-sectional portions 21, 22, and 23 has a vertically long and narrow cross-section. That is, the height (dimension in the thickness direction) connecting the top plate portion 25 and the strip plate portion 11 in each of the hollow cross-sectional portions 21, 22, and 23 is larger than the dimension in the width direction of the corresponding hollow cross-sectional portion 21, 22, and 23. The thicknesses of the top plate portion 25 and the side plate portion 26 in the reinforcing protrusion portion 20 are substantially the same as the thickness of the strip plate portion 11, that is, the bottom of the hollow cross-sectional portions 21 and 22.

[0033] An isolation groove 31 is formed between the opposing side plate portions 26, 26 of two adjacent hollow cross-sectional portions 21, 22 and 22, 23. The two adjacent hollow cross-sectional portions are separated by the isolation groove 31. An opening 31c is formed by opening the isolation groove 31 to the outer peripheral side (upper side in FIG. 2). The top plate portions 25 of the adjacent hollow cross-sectional portions are separated by the opening 31c. An isolation portion 30 that separates adjacent hollow portions 29 is constituted by the opposing side plate portions 26, 26 and the isolation groove 31. The width of the isolation groove 31 is smaller than the dimension in the width direction of the hollow cross-sectional portions 21, 22, and 23. Specifically, the width of the isolation groove 31 is preferably 10 mm or less, and more preferably 6 mm or less.

[0034] Of the three hollow cross-sections, the first hollow cross-section 21 closest to the first fitting portion 13 is continuously connected to the first fitting portion 13. One side portion of the first fitting portion 13 constitutes a part of the first hollow cross-section 21. Specifically, the top end portion 16c on the outer peripheral side of the first raised portion 16 closest to the first hollow cross-section 21 among the raised portions is continuously connected to the top plate portion 25 of the first hollow cross-section 21. The side wall portion 16b of the first raised portion 16 facing the reinforcing protrusion 20 is provided as one side plate portion of the first hollow cross-section 21. The top end portion 16c of the first raised portion 16 and the top end portion 15c of the adjacent raised portion 15 are separated from each other.

[0035] As shown in FIG. 1, the strip-shaped member 10 is spirally wound along the inner circumference of the existing pipe 1, and the adjacent fitting grooves 15a, 16a and the fitting convex portions 14a, 14b are fitted to each other. Thereby, the spiral tubular regenerated pipe 9 is manufactured. The pipe manufacturing is performed using a pipe manufacturing machine (not shown). Thereafter, further cut the fitting convex portion 14b at the easily cut portion 14c, and while fixing one end portion in the pipe axis direction of the regenerated pipe 9, twist the other end portion in the pipe axis direction of the regenerated pipe 9 to slide the fitting portions 13, 14, and expand the diameter of the regenerated pipe 9 (expand pipe manufacturing).

[0036] According to the strip-shaped member 10, the reinforcing protrusion 20 is divided into a plurality of hollow cross-sections 21, 22, 23. Therefore, even when curvature is applied during pipe manufacturing, cross-sectional deformation of the reinforcing protrusion 20 can be suppressed. In particular, a large tensile stress acts on the outer peripheral side portion of the reinforcing protrusion 20 due to the application of curvature during pipe manufacturing, but since the outer peripheral side portion is divided into a plurality of top plate portions 25, cross-sectional deformation can be reliably suppressed. Furthermore, by increasing the total area of the top plate portions 25 of the plurality of hollow cross-sections 21, 22, 23, the rigidity of the strip-shaped member 10 is increased, and the self-supporting strength of the strip-shaped member alone is exhibited. As a result, the strength of the regenerated pipe 9 as a self-supporting pipe can be ensured.

[0037] Furthermore, in the strip member 10, adjacent hollow cross-sectional portions 21, 22, and 23 are separated by the isolation groove 31, and since the individual hollow cross-sectional portions 21, 22, and 23 are independent, variations in the rigidity distribution in the strip member 10 are suppressed, and the rigidity difference between the fitting portions 13, 14 and the reinforcing protrusion 20 is reduced. Therefore, even if the fitting portions 13, 14 have lower rigidity than the reinforcing protrusion 20, it is possible to suppress the fitting portions 13, 14 from being significantly deformed in cross-section due to the application of curvature during pipe manufacturing. Since each of the hollow cross-sectional portions 21, 22, and 23 has a vertically long and narrow structure, it is possible to suppress deformation of the top plate portion 25 due to the application of curvature during pipe manufacturing. Since the width of the isolation groove 31 is narrower than the width of the hollow cross-sectional portions 21, 22, and 23, even if a load beyond the assumed value is locally applied after pipe manufacturing, the possibility of the hollow cross-sectional portions 21, 22, and 23 being crushed and collapsing is low.

[0038] Furthermore, since the first hollow cross-sectional portion 21 and the first raised portion 16 are structurally integrally connected, the rigidity of the first raised portion 16 is increased. As a result, it is possible to suppress cross-sectional deformation of the first fitting portion 13 due to the application of curvature and fitting operation during pipe manufacturing. In particular, it is possible to reliably suppress the first raised portion 16 from being deformed so as to fall. As a result, the fitting portions 13, 14 can be stably fitted together. Even if the fitting timing for each of the raised portions 15, 16 is shifted, by suppressing deformation of the first raised portion 16, the fitting grooves 15a, 16a of each of the raised portions 15, 16 and the fitting convex portions 14a, 14b of the second fitting portion 14 can be reliably fitted together. Furthermore, deformation of the second fitting portion 14 fitted to the first fitting portion 13 can also be suppressed. As a secondary effect, since the top plate portion 25 and the top end portion 16c serve as the installation cost of the outer peripheral roller of the pipe manufacturing machine, it is possible to prevent the strip member 10 from coming off the pipe manufacturing machine, and an effect of being able to stably manufacture a pipe can also be obtained. Furthermore, by configuring the reinforcing protrusion 20 with a plurality of hollow cross-sectional portions 21, 22, and 23, the strength as a self-supporting pipe can be efficiently exhibited. Therefore, the required amount of the resin material for the strip member 10 can be reduced, contributing to cost reduction. Also, by reducing the weight of the strip member 10 per unit length, workability can be improved.

[0039] Next, another embodiment of the present invention will be described. Regarding the configurations that overlap with those already described in the following embodiments, the same reference numerals are given in the drawings and the description will be omitted as appropriate. <Second Embodiment (Figure 4)> As shown in Figure 4, in the strip-shaped member 10B according to the second embodiment of the present invention, the reinforcing protrusion 20 has a flat top plate 24, two (a plurality of) partition walls 32, and one side plate portion 26B on the side of the second fitting portion 14. The two partition walls 32 are arranged at intervals in the middle portion in the width direction of the reinforcing protrusion 20. Each partition wall 32 intersects the top plate 24 and the strip plate portion 11 and is arranged parallel to the side plate portion 26B. By these partition walls 32, the reinforcing protrusion 20 is partitioned into three hollow cross-sectional portions 21B, 22B, and 23B. The adjacent hollow portions 29 are separated by the partition walls 32 (partition portions).

[0040] The top plate portions 25B of the adjacent hollow cross-sectional portions 21B, 22B, and 23B are integrally connected at the intersection with the partition wall 32. The top plate 24 is constituted by the continuous top plate portions 25B of the three hollow cross-sectional portions 21B, 22B, and 23B. The point where the top plate portion 25B of the first hollow cross-sectional portion 21B is integrally connected to the top end portion 16c of the first raised portion 16, and the point where the side wall portion 16b of the first raised portion 16 is provided as the side plate portion of the first hollow cross-sectional portion 21B are the same as those in the first embodiment (Figure 2).

[0041] According to the second embodiment, by increasing the area of the top plate 23B, the rigidity of the strip-shaped member 10B is improved. As a result, the rigidity of the rehabilitation tube 9 can be improved.

[0042] <Third Embodiment (Figure 5)> As shown in Fig. 5, in the belt-like member 10C according to the third embodiment, brace portions 27 are provided in hollow cross-sectional portions 22C and 23C other than the first hollow cross-sectional portion 21 in the belt-like member 10 of the first embodiment (Fig. 2). The brace portion 27 is obliquely spanned in the hollow portion 29 so as to connect a corner portion at one end in the width direction of the hollow portion 29 and on the outer peripheral side (upper left side in Fig. 5) and a corner portion at the other end in the width direction of the hollow portion 29 and on the inner peripheral side (lower right side in Fig. 5). By the brace portion 27, the hollow portion 29 is divided into hollow portions 29a having cross-sections of two right-angled triangles. A brace portion 27 may also be provided in the first hollow cross-sectional portion 21. The inclination of the brace portion 27 may be opposite to that in Fig. 5. That is, the brace portion 27 may be obliquely spanned in the hollow portion 29 so as to connect a corner portion at one end in the width direction of the hollow portion 29 and on the inner peripheral side (lower left side in Fig. 5) and a corner portion at the other end in the width direction of the hollow portion 29 and on the outer peripheral side (upper right side in Fig. 5). Two brace portions may be crossed in an X shape.

[0043] According to the third embodiment, the rigidity of the hollow cross-sectional portions 22C and 23C is increased by the brace portion 27, and thus the rigidity of the belt-like member 10C is further increased. As a result, the cross-sectional deformation of the belt-like member 10C can be more reliably suppressed. Also, the collapse of the hollow cross-sectional portions 22C and 23C can be reliably prevented against the force from the outer peripheral side roller of the pipe manufacturing machine during pipe manufacturing.

[0044] <Fourth Embodiment (Fig. 6)> As shown in Fig. 6, in the belt-like member 10D according to the fourth embodiment, side plate portions 41 of the hollow cross-sectional portions 22D and 23D other than the first hollow cross-sectional portion 21 are each formed in an arc-shaped cross-section. Intermediate portions 41c between a pair of side plate portions 41 in each of the hollow cross-sectional portions 22D and 23D face each other and are attached and integrated. The hollow portion 49 of the hollow cross-sectional portions 22D and 23D is divided into a hollow portion 49c on the inner peripheral side (lower side in the figure) and a hollow portion 49d on the outer peripheral side (upper side in the figure) with the attached intermediate portions 41c interposed therebetween. The cross-sectional shapes of the hollow portions 49c and 49d are triangles with their vertices facing each other. While the middle portions 41c of the pair of side plate portions 41 of the respective hollow cross-sectional portions 22D and 23D are close to each other, they do not necessarily have to be attached. The pair of side plate portions 41 of the respective hollow cross-sectional portions 22D and 23D may have an X-shaped cross section.

[0045] Between the first hollow cross-sectional portion 21 and the middle hollow cross-sectional portion 22D, a semicircular cross-sectional isolation groove 42 is formed by these opposing side plate portions 26 and 41. The isolation groove 42 is open to the outer peripheral side (upper side in FIG. 6) through the opening 42c. An isolation portion 44 is constituted by the opposing side plate portions 26 and 41 and the isolation groove 42.

[0046] Between adjacent middle cross-sectional portions 22D and 23D, an isolation groove 43 having a substantially circular cross section is formed by their mutually arcuate side plate portions 41. The isolation groove 43 is open to the outer peripheral side (upper side in FIG. 6) through the opening 43c. The top plate portions 25 of the adjacent hollow cross-sectional portions 22D and 23D are separated by the opening 43c. An isolation portion 45 is formed by the opposing side plate portions 44 and 44 and the isolation groove 43.

[0047] According to the fourth embodiment, the rigidity of the hollow cross-sectional portions 22D and 23D is increased, and thus the rigidity of the belt-like member 10C is further increased. As a result, the cross-sectional deformation of the belt-like member 10D can be more reliably suppressed. Also, the collapse of the hollow cross-sectional portions 22D and 23D can be reliably prevented against the force from the outer peripheral side roller of the pipe manufacturing machine during pipe manufacturing.

[0048] <Fifth Embodiment (FIG. 7)> As shown in FIG. 7, in the belt-like member 10E according to the fifth embodiment, the reinforcing protrusion 20E includes two (a plurality of) hollow cross-sectional portions 21E and 22E. That is, the reinforcing protrusion 20E is divided into two hollow cross-sectional portions 21E and 22E. The two hollow cross-sectional portions 21E and 22E are arranged side by side in the width direction of the belt-like member 10E (left and right in FIG. 7).

[0049] Each of the hollow cross-sectional portions 21E and 22E has a horizontally long cross-section. That is, the height (dimension in the thickness direction) connecting the top plate portion 25 and the strip plate portion 11 in each of the hollow cross-sectional portions 21E and 22E is smaller than the dimension in the width direction of the corresponding hollow cross-sectional portion 21E and 22E.

[0050] An isolation portion 30 including an isolation groove 31 is formed between the two hollow cross-sectional portions 21E and 22E. The number of the isolation portions 30 in the strip-shaped member 10E is one. The point where the top plate portion 25 of the first hollow cross-sectional portion 21E is integrally continuous with the top end portion 16c of the first raised portion 16, and the point where the side wall portion 16b of the first raised portion 16 is provided as the side plate portion of the first hollow cross-sectional portion 21E are the same as those in the first embodiment (FIG. 2).

[0051] According to the strip-shaped member 10E, since the hollow cross-sectional portions 21E and 22E have a horizontally long structure, the number of the isolation portions 30 can be reduced compared with a strip-shaped member of an equivalent width having a vertically long structure (for example, FIG. 2), and the total cross-sectional area of the isolation portions in the entire strip-shaped member can be made smaller. Thereby, the strip-shaped member 10E can be lightened, and cost reduction and workability improvement can be achieved.

[0052] <Sixth Embodiment (FIG. 8)> As shown in FIG. 8, in the sixth embodiment of the present invention, similar to the first embodiment (FIGS. 1 to 3), the strip-shaped member 10F includes a strip plate portion 11, fitting portions 13 and 14, and a reinforcing protrusion 20, and has a certain cross-sectional shape and extends in the strip length direction. In the spiral tubular regeneration pipe 9F formed of the strip-shaped member 10F, the fitting grooves 15a and 16a of the first fitting portion 13 and the fitting convex portions 14a and 14b of the second fitting portion 14 are fitted to each other. The flat strip plate portion 11 constitutes the pipe wall portion 9a on the inner peripheral side of the regeneration pipe 9F. The top plate portions 25 of the hollow cross-sectional portions 21, 22, and 23 having a quadrangular cross-section of the reinforcing protrusion 20 constitute the pipe wall portion on the outer peripheral side of the regeneration pipe 9F. The top plate portion 25 is parallel to the strip plate portion 11.

[0053] On the outer periphery of the rehabilitation pipe 9F, outer peripheral grooves 31, 13c, 13d (hatched portions in Fig. 8) are formed by adjacent protruding portions 15, 16, 21, 22, 23. Specifically, isolation grooves 31 are respectively formed between adjacent hollow cross-sectional portions 21, 22 and 22, 23. A groove 13c is formed between the raised portions 15, 16 of the first fitting portion 13. Further, a circumferential groove 13d is formed between the adjacent raised portion 15 and the reinforcing protrusion 20 that are one turn different from each other. These outer peripheral grooves 31, 13c, 13d extend spirally along the spirally wound belt-like member 10F, open to the outer peripheral side of the rehabilitation pipe 9F, and are connected to the inter-pipe gap 1c between the existing pipe 1 and the rehabilitation pipe 9F shown by the two-dot chain line in Fig. 8.

[0054] The inter-pipe gap 1c and the outer peripheral grooves 31, 13c, 13d are not filled with a backfill material such as mortar. Therefore, the inter-pipe gap 1c and the outer peripheral grooves 31, 13c, 13d are void portions 1d without a filling material. The rehabilitation pipe 9F may be in close contact with the existing pipe 1. For example, the fitting convex portion 14b is cut at the easily cut portion 14c, and with one end portion in the pipe axis direction of the rehabilitation pipe 9F fixed, the other end portion in the pipe axis direction of the rehabilitation pipe 9F is twisted to slide the fitting portions 13, 14, and the outer periphery of the rehabilitation pipe 9F may be brought into close contact with the inner peripheral surface of the existing pipe 1 by expanding the diameter of the rehabilitation pipe 9F (expanded pipe). In this case, the inter-pipe gap 1c is not formed, and the void portion 1d is constituted only by the outer peripheral grooves 31, 13c, 13d.

[0055] As shown by hatching in Fig. 8, the effective width of the belt-like member 10F is equal to the spiral pitch P along the pipe axis of the rehabilitation pipe 9F 9F and is equal. The apparent cross-sectional area S0 per pitch P of the rehabilitation pipe 9F, that is, the spiral pitch P 9F is equal to the product of the thickness t of the belt-like member 10F. 9F and the pipe thickness t 9F (S0 = P 9F × t 9F ).

[0056] The ratio (S1 / S0) of the cross-sectional area S1 of the outer peripheral grooves 31, 13c, 13d (the shaded portions in Fig. 8) to the apparent cross-sectional area S0 is preferably 40% or less, more preferably 30% or less, and still more preferably 20% or less. Thereby, the volume of the outer peripheral grooves 31, 13c, 13d and thus the volume of the gap portion 1d can be made as small as possible, and the intrusion flow rate of groundwater can be suppressed to a flow rate at which sediment cannot be drawn in. Therefore, the risk of ground subsidence and road depression due to the drawing in of sediment can be reduced.

[0057] By facing the top plate portion 25 parallel to the strip portion 11 with the inner peripheral surface of the existing pipe, the area where the rehabilitation pipe 9F can be in close contact with the existing pipe 1 can be increased, and the volume of the gap portion 1d can be reduced. By providing the hollow cross-sectional portions 21, 22, 23 in the reinforcing protrusion 20 to make it hollow, the amount of raw material resin required for manufacturing the strip-shaped member 10F can be reduced, the cost can be reduced, and the weight can be reduced.

[0058] In the sixth embodiment, the gap portion 1d may be filled with a backfill material such as mortar. In that case, since the volume of the outer peripheral grooves 31, 13c, 13d is small, the required amount of the backfill material can be suppressed, and cost reduction can be achieved.

[0059] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit thereof. For example, the number of the hollow cross-sectional portions is not limited to three or two, and may be four or more. The first fitting portion 13 may have not only a fitting groove but also a fitting protrusion, and the second fitting portion 14 may have not only a fitting protrusion but also a fitting groove into which the fitting protrusion of the first fitting portion 13 fits. A plurality of embodiments may be combined with each other. For example, the brace portion 27 (Fig. 5) may be provided in the hollow cross-sectional portions of the strip-shaped members 10B, 10E, 10F (Figs. 4, 7, 8). In the embodiment, the top surface 25a of the top plate portion 25 is at the highest position (the outermost peripheral position) of the strip-shaped member 10 for rehabilitating an existing pipe. However, in consideration of the ease of diameter expansion after fitting, it is at a position higher than the neutral axis where the second moment of area of the strip-shaped member 10 for rehabilitating an existing pipe is minimized (a position on the outer peripheral side), more preferably, it may be between the position 1 / 3 lower than the total height (thickness) of the strip-shaped member 10 for rehabilitating an existing pipe from the highest position to the highest position. The side plate portion 26 may protrude to the outer peripheral side from the top plate portion 25, and the end portion on the outer peripheral side of the side plate portion 26 may be arranged at the highest position (the outermost peripheral position) of the strip-shaped member 10 for rehabilitating an existing pipe. The top surface 25a is preferably a flat surface parallel to the outer surface of the strip plate portion 11, but may also be a concave surface recessed toward the inner peripheral side, a convex surface protruding toward the outer peripheral side, or an uneven surface, and the uneven surface may be a curved surface. The isolation groove 31 does not have to extend to the back surface of the strip plate portion 10, and preferably has a depth of at least half the height of the hollow portion 29, and more preferably a depth of at least 3 / 4. In order to further increase the strength of the rehabilitated pipe, a reinforcing material may be provided in the hollow portion 29 by injecting a curable raw material such as mortar or urethane. In the case of mortarless, etc., the opening may be filled with a foam or an elastic body so that earth and sand do not enter the opening. The top plate portion 25 is integrally formed with the strip-shaped member 10, but in order to reduce the risk of ground settlement or road subsidence due to the drawing in of earth and sand, it may be a separate component from the portion of the strip-shaped member 10 excluding the top plate portion 25. In the case of a separate component, the component constituting the top plate portion and the portion to be excluded may be integrated by adhesion, fusion, or fitting.

Industrial Applicability

[0060] The present invention can be applied to a technique for rehabilitating an existing buried pipe such as an aging sewer pipe.

Explanation of Reference Numerals

[0061] 1 Existing pipe 9, 9F Rehabilitated pipe 9a Inner peripheral side pipe wall portion 10 Strip-shaped member for rehabilitating an existing pipe 10B, 10C, 10D, 10E, 10F Belt-shaped member for rehabilitation of existing pipes 11 Belt plate part 13 First fitting part 14 Second fitting part 14a, 14b Fitting convex parts 15 Raised part 15a Fitting groove 15c Top end part 16 First raised part 16a Fitting groove 16c Top end part 16b Side wall part 20, 20E Reinforcing protrusion 21, 21B, 21E First hollow cross-sectional part 22, 22B, 22C, 22D, 22E Hollow cross-sectional part 23, 23B, 23C, 23D Hollow cross-sectional part 24 Top plate 25, 25B Top plate part (pipe wall part on the outer peripheral side of the rehabilitation pipe) 25a Top surface (surface facing the outer peripheral side) 26 Side plate part 26B Side plate part 27 Brace part 29 Hollow part 29a Hollow part 30 Isolation part 31 Isolation groove 31c Opening part 32 Isolation wall (isolation part) 41 Side plate part 41c Intermediate part 42 Semi-circular isolation groove 42c Opening part 43 Isolation groove 43c Opening part 44 Isolation part 45 Isolation part 49 Hollow part 49c, 49d Hollow parts

Claims

1. A strip-shaped member made of synthetic resin that constitutes the entire length of a spiral-shaped regenerated pipe, which is lined on the inner circumference of an existing pipe and becomes a self-supporting pipe that bears the required strength independently without borrowing the strength of the existing pipe. The strip-shaped member includes: a strip plate portion that is an integral body in the width direction and constitutes the pipe wall portion on the inner circumferential side of the regenerated pipe; a first fitting portion that has a fitting groove opening to the inner circumferential side and is raised from one end portion in the width direction of the strip plate portion to the outer circumferential side opposite to the inner circumferential side; a second fitting portion that is provided so as to protrude from the other end portion in the width direction of the strip plate portion to the outer circumferential side and includes a fitting convex portion that is fitted into the fitting groove of the adjacent first fitting portion when spirally wound; a reinforcing protrusion that protrudes from the strip plate portion between the first fitting portion and the second fitting portion to the outer circumferential side; The reinforcing protrusion includes a plurality of hollow cross-sectional portions arranged in the width direction, the hollow portions of adjacent hollow cross-sectional portions are separated via a separating portion, each hollow cross-sectional portion has a top plate portion that constitutes the pipe wall portion on the outer circumferential side of the regenerated pipe, and the strip plate portion has a constant thickness in the width direction including the bottom portion of the hollow cross-sectional portion formed by the strip plate portion. The strip-shaped member is characterized by having the rigidity to become the self-supporting pipe.

2. A strip-shaped member made of synthetic resin that constitutes a spiral-shaped regenerated pipe to be lined on the inner circumference of an existing pipe. The strip-shaped member includes: a strip plate portion that is an integral body in the width direction and constitutes the pipe wall portion on the inner circumferential side of the regenerated pipe; a first fitting portion that has a fitting groove opening to the inner circumferential side and is raised from one end portion in the width direction of the strip plate portion to the outer circumferential side opposite to the inner circumferential side; a second fitting portion that is provided so as to protrude from the other end portion in the width direction of the strip plate portion to the outer circumferential side and includes a fitting convex portion that is fitted into the fitting groove of the adjacent first fitting portion when spirally wound; a reinforcing protrusion that protrudes from the strip plate portion between the first fitting portion and the second fitting portion to the outer circumferential side; The reinforcing protrusion includes a plurality of hollow cross-sectional portions arranged in the width direction, the hollow portions of adjacent hollow cross-sectional portions are separated via a separating portion, each hollow cross-sectional portion has a top plate portion that constitutes the pipe wall portion on the outer circumferential side of the regenerated pipe, and the strip plate portion has a constant thickness in the width direction including the bottom portion of the hollow cross-sectional portion formed by the strip plate portion. The adjacent hollow cross-sectional portions have side plate portions facing each other, and an isolation groove for separating the adjacent hollow cross-sectional portions from each other is formed so as to open to the outer peripheral side between these side plate portions, and the width of the isolation groove, and thus the distance between the side plate portions facing each other, is smaller than the width of each hollow cross-sectional portion. A strip-shaped member characterized by this.

3. A strip-shaped member made of a synthetic resin that constitutes a spiral tubular rehabilitation pipe lined on the inner periphery of an existing pipe, A strip plate portion that constitutes the pipe wall portion on the inner peripheral side of the rehabilitation pipe, A first fitting portion having a fitting groove that opens to the inner peripheral side and is raised from one end portion in the width direction of the strip plate portion to the outer peripheral side opposite to the inner peripheral side, A second fitting portion provided so as to protrude from the other end portion in the width direction of the strip plate portion to the outer peripheral side, and including a fitting convex portion that is fitted into the fitting groove of an adjacent first fitting portion when spirally wound, A reinforcing protrusion protruding from the strip plate portion to the outer peripheral side between the first fitting portion and the second fitting portion, Comprising, the reinforcing protrusion includes a plurality of hollow cross-sectional portions arranged in the width direction, the hollow portions of adjacent hollow cross-sectional portions are separated from each other via a separation portion, and each hollow cross-sectional portion has a top plate portion that constitutes the pipe wall portion on the outer peripheral side of the rehabilitation pipe, The adjacent hollow cross-sectional portions have side plate portions facing each other, and an isolation groove for separating the adjacent hollow cross-sectional portions from each other is formed so as to open to the outer peripheral side between these side plate portions, The hollow cross-sectional portion has a pair of the side plate portions, these pair of side plate portions are each formed in an arc-shaped cross-section, the middle portions of these pair of side plate portions face each other or are attached to each other, and the portions on the outer peripheral side of the middle portions and the portions on the inner peripheral side of the middle portions of these pair of side plate portions are farther away from the middle portions than the middle portions. A strip-shaped member characterized by this.

4. A strip-shaped member made of a synthetic resin that constitutes a spiral tubular rehabilitation pipe lined on the inner periphery of an existing pipe, A strip plate portion that constitutes the pipe wall portion on the inner peripheral side of the rehabilitation pipe, A first fitting portion having a fitting groove that opens to the inner peripheral side and is raised from one end portion in the width direction of the strip plate portion to the outer peripheral side opposite to the inner peripheral side, A second fitting portion provided so as to protrude from the other end portion in the width direction of the strip plate portion to the outer peripheral side, and including a fitting convex portion that is fitted into the fitting groove of an adjacent first fitting portion when spirally wound, A reinforcing protrusion protruding from the strip plate portion to the outer peripheral side between the first fitting portion and the second fitting portion, comprising, wherein the reinforcing protrusions include a plurality of hollow cross-sectional portions arranged in the width direction, the hollow portions of adjacent hollow cross-sectional portions are separated via a separating portion, and each hollow cross-sectional portion has a top plate portion constituting the pipe wall portion on the outer peripheral side of the regeneration pipe. The strip-shaped member is characterized in that the hollow cross-sectional portion integrally includes a brace portion obliquely bridging the hollow portion.

5. The strip-shaped member according to claim 1 or 4, wherein the separating portion has a separating wall intersecting the strip plate portion and the top plate portion, and the top plate portions of the adjacent hollow cross-sectional portions are integrally continuous at the intersection with the separating wall.

6. The strip-shaped member according to claim 1 or 5, wherein the hollow cross-sectional portion has a pair of side plate portions with an arc-shaped cross section, and the middle portions of the pair of side plate portions face each other or are attached to each other.

7. The strip-shaped member according to any one of claims 1 to 6, wherein the first hollow cross-sectional portion closest to the first fitting portion among the hollow cross-sectional portions is integrally continuous with the first fitting portion, and one side portion of the first fitting portion constitutes a part of the first hollow cross-sectional portion.

8. The first fitting portion includes a plurality of raised portions that are raised to the outer peripheral side and arranged in the width direction, and each raised portion has the fitting groove. The strip-shaped member according to claim 7, wherein the tip end portion on the outer peripheral side of the first raised portion closest to the first hollow cross-sectional portion among these raised portions is integrally continuous with the top plate portion of the first hollow cross-sectional portion.

9. The strip-shaped member according to any one of claims 1 to 8, wherein the dimension in the thickness direction connecting the top plate portion and the strip plate portion in each hollow cross-sectional portion is larger than the dimension in the width direction in the hollow cross-sectional portion.

10. The strip-shaped member according to any one of claims 1 to 9, wherein the ratio of the cross-sectional area of the outer peripheral groove opened to the outer peripheral side to the apparent cross-sectional area, which is the product of the spiral pitch along the pipe axis of the regeneration pipe made of the strip-shaped member and the pipe thickness, is 40% or less.

Images