Strip-shaped member for rehabilitating existing pipes

Abstract

To facilitate pipe production of a spiral-shaped regeneration pipe.SOLUTION: There is provided a strip-shaped member 10 for existing pipe regeneration, in which a first fitting portion 13 is provided that protrudes from a bottom plate portion 11 constituting a pipe wall portion 9a on an inner periphery side of a regeneration pipe 9 toward one end side in a width direction. In the other end portion of the bottom plate portion 11 in a width direction, a second fitting portion 14 is provided that is unevenly fitted to the first fitting portion 13 in a pipe diameter direction. An end portion on an outer periphery of a vertical plate portion 15 standing from the bottom plate portion 11 toward the outer periphery intersects with a lid plate portion 12. The lid plate portion 12 extends from the bottom plate portion 11 toward one end side in the width direction and covers the outer periphery of the first fitting portion 13 at a distance. When manufacturing a spiral-shaped regeneration pipe 9 from the strip-shaped member 10, a position alignment of a pipe production machine can be performed, and hooking caused by directly touching a bottom guide with the existing pipe can be prevented by engaging, for example, a pinch roller 31 or the bottom guide of the pipe production machine with a portion 12f extending toward one end of the lid plate portion 12 in the width direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a strip-shaped member for rehabilitating deteriorated existing pipes, and more particularly to a strip-shaped member made of synthetic resin that constitutes a spiral tubular rehabilitation pipe that is lined on the inner periphery of an existing pipe. [Background technology]

[0002] A construction method is known in which the inner periphery of an existing pipe, such as an aged sewer pipe, is lined with a rehabilitation pipe to rehabilitate the existing pipe. The rehabilitation pipe is made of, for example, a strip-shaped member made of synthetic resin (see, for example, Patent Documents 1 to 5, etc.).

[0003] This type of band-shaped member includes a flat band plate portion, male and female mating portions, and a reinforcing rib. The female mating portion has a mating groove that opens to the inner periphery and is raised from one widthwise end of the band plate portion to the outer periphery. The male mating portion has a mating protrusion that protrudes from the other widthwise end of the band plate portion to the outer periphery. Here, the inner periphery side refers to the side that faces radially inward when made into a rehabilitated pipe. The outer periphery side refers to the side that faces radially outward when made into a rehabilitated pipe.

[0004] A reinforcing rib is provided at the middle of the width of the band plate portion so as to protrude outward. Generally, the reinforcing rib is formed with an I-shaped or T-shaped cross section. A plurality of reinforcing ribs are arranged side by side at intervals in the width direction of the band-shaped member (see Patent Documents 1 to 3, etc.). The reinforcing rib in Patent Document 4 is formed with a U-shaped cross section and is filled with a filler. The strip-shaped member in Patent Document 5 is formed with a single reinforcing protrusion with a hollow rectangular or circular cross section. The strip-shaped member in Patent Document 6 is formed with a single reinforcing protrusion with an H-shaped cross section.

[0005] The belt-shaped member is wound spirally by a pipe making machine and pinched by a pair of pinch rollers of the pipe making machine, so that the fitting grooves and fitting protrusions of adjacent male and female fitting portions fit together, thereby forming a helical rehabilitating pipe from the belt-shaped member (see Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication WO2016 / 175243 (Figures 3 and 4) [Patent Document 2] JP 2020-143710 A (Fig. 2, Fig. 11) [Patent Document 3] International Publication WO02 / 048594 (Figures 16 and 25) [Patent Document 4] Japanese Patent Application Laid-Open No. 06-143420 (Fig. 1) [Patent Document 5] JP 2018-155280 A (Fig. 3) [Patent Document 6] Japanese Patent Application Laid-Open No. 11-105134 (Fig. 1) Summary of the Invention [Problem to be solved by the invention]

[0007] If the band-shaped member is made into a simple thick-walled flat plate shape without any irregularities, it is difficult to align the fitting using a pipe making machine when manufacturing a spiral pipe, and it is also difficult to bend and deform, which causes problems in pipe manufacturing. In view of the above circumstances, an object of the present invention is to facilitate the manufacturing of a helical rehabilitating pipe. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a belt-shaped member for existing pipe rehabilitation made of synthetic resin that constitutes a spiral-shaped rehabilitation pipe that is lined on the inner periphery of an existing pipe, a bottom plate portion that constitutes a pipe wall portion on an inner circumferential side of the rehabilitating pipe; a first fitting portion provided so as to protrude from the bottom plate portion toward one end side in the width direction of the belt-shaped member; a second fitting portion provided at the other end of the bottom plate portion in the width direction, the second fitting portion fitting convexly and concavely with the first fitting portion in the pipe diameter direction in the rehabilitating pipe; a vertical plate portion extending from the bottom plate portion toward the outer periphery of the belt-shaped member in the thickness direction, the vertical plate portion being higher than the first fitting portion and the second fitting portion; a cover plate portion that intersects with the outer peripheral end portion of the vertical plate portion and constitutes an outer peripheral pipe wall portion of the rehabilitating pipe; The cover plate portion extends from the bottom plate portion toward one end in the width direction and covers the outer periphery of the first fitting portion at a distance. This makes it easier to manufacture a helical rehabilitating pipe. Preferably, the cover plate portion and the first fitting portion are spaced apart from each other in the thickness direction, forming a space therebetween. Furthermore, in the conventional strip-shaped members for rehabilitating existing pipes disclosed in the above-mentioned patent documents and the like, the male and female mating portions and reinforcing ribs protrude outward, so that the outer peripheral surface of the rehabilitation pipe made of the strip-shaped member is formed with multiple spiral irregularities. Therefore, if backfilling between the existing pipe and the rehabilitation pipe is omitted, it is possible that groundwater or earth and sand will enter the recessed parts on the outer periphery of the rehabilitation pipe, causing it to collapse. Therefore, in order to make the outer peripheral surface of the rehabilitation pipe as smooth as possible and prevent subsidence on the ground surface without interfering with the manufacturing of the rehabilitation pipe, the present invention provides a strip-shaped member for rehabilitating existing pipes made of synthetic resin that forms a spiral-shaped rehabilitation pipe that is lined on the inner periphery of the existing pipe, a bottom plate portion that constitutes a pipe wall portion on an inner circumferential side of the rehabilitating pipe; a cover plate portion that covers an outer peripheral side of the bottom plate portion and constitutes a pipe wall portion on an outer peripheral side of the rehabilitating pipe; a first fitting portion provided at one end of the bottom plate portion in the width direction; a second fitting portion provided at the other end of the bottom plate portion in the width direction, the second fitting portion fitting convexly and concavely with the first fitting portion in the rehabilitation pipe; a plurality of vertical plate portions that connect the bottom plate portion or the first fitting portion and the cover plate portion and are arranged at intervals in the width direction; A second feature of the present invention is that it comprises a plurality of hollow portions separated by the vertical plate portions and formed side by side in the width direction.

[0009] When producing a rehabilitation pipe from the strip-shaped member, a pipe-making machine (see Patent Documents 1 to 3, etc.) is used to spirally wind the strip-shaped member while fitting adjacent first and second fitting portions together. At this time, for example, by arranging the fins of the pinch rollers of the pipe-making machine to be applied to the edge of the cover plate portion of the strip-shaped member or the side of the second fitting portion, the strip-shaped member can be positioned in the width direction relative to the pipe-making machine, and the first and second fitting portions can be accurately aligned and fitted together. Furthermore, compared to strip-shaped members with simple thick, flat plates, bending deformation is easier. Therefore, even if the outer periphery of the strip-shaped member is made of a flat cover plate, pipe production can be carried out without any problems. In the rehabilitation pipe made of this strip-shaped member, at least a portion of the outer surface is formed by a cover plate, which reduces the volume of the recessed portion on the outer periphery of the rehabilitation pipe. Therefore, even in a backfill-less construction method that omits backfilling between the existing pipe and the rehabilitation pipe, the amount of groundwater and sediment that flows into the recessed portion can be reduced, and the collapse of the ground surface can be prevented. Furthermore, according to the belt-shaped member of the second feature, the plurality of hollow portions increases rigidity and suppresses cross-sectional deformation.

[0010] In the belt-shaped member for rehabilitating an existing pipe according to the second feature, the other end in the width direction of the bottom plate portion extends beyond the cover plate portion, It is preferable that the cover plate portion covers 80% or more of the width of the bottom plate portion excluding the other end portion from the outer periphery side. This allows most of the outer surface of the rehabilitating pipe to be a smooth surface, further preventing depression.

[0011] In the belt-shaped member for rehabilitating an existing pipe according to the second feature, it is preferable that the cover plate portion continuously spans the plurality of vertical plate portions, thereby making most of the outer peripheral surface of the rehabilitating pipe a smooth surface and further suppressing subsidence. The cover plate is preferably positioned at a height within ±10% of the design height along the thickness direction of the strip-shaped member. The cover plate may be positioned at a height equal to or higher than the design height and be elastically pushed toward the bottom plate. This allows the gap between the existing pipe and the rehabilitated pipe to be minimized even if a recess has formed on the inner surface of the existing pipe due to deterioration. The first fitting portion or the vertical plate portion may protrude outward from the cover plate portion.

[0012] In the strip-shaped member for rehabilitating existing pipes relating to the second feature, the vertical plate portion in the middle in the width direction may have two adjacent vertical plate portions, and a recessed groove opening into the outer peripheral surface of the cover plate portion may be formed between these vertical plate portions. This allows the belt-shaped member to be reliably positioned in the width direction relative to the pipe making machine by inserting the fins of the pinch rollers of the pipe making machine into the grooves during pipe making. In this case, the total width of the part of the cover plate facing the bottom plate, excluding one end in the width direction, is preferably larger than the total width of the grooves, and more preferably is sufficiently larger than the total width of the grooves.

[0013] In the belt-shaped member for rehabilitating an existing pipe according to the second aspect, it is preferable that a filler is provided in the groove, thereby preventing groundwater and earth and sand from flowing into the groove and suppressing subsidence. Preferably, the filler is filled into the entire groove of the strip-shaped member before the member is made into a pipe, and more preferably, the filler is filled into the groove in parallel with the formation of the strip-shaped member.

[0014] In the strip-shaped member for rehabilitating an existing pipe according to the second feature, it is preferable that the filler be elastically compressible toward the inner periphery. This allows the filler to be inserted into the groove and positioned while being compressed by the fins of the pinch rollers of the pipe making machine during pipe production. When the fins are then removed from the groove, the filler elastically returns to the outer periphery, preventing groundwater and earth and sand from flowing into the groove and suppressing subsidence. The filler may be a simple packing material that fills the recessed grooves, and may not have elastic compressibility.

[0015] In the strip-shaped member for rehabilitating an existing pipe relating to the second feature, it is preferable that a positioning protrusion is provided on the extended portion (the other end in the width direction) of the bottom plate portion so as to protrude toward the outer periphery. This allows the belt-shaped member to be accurately positioned in the width direction relative to the pipe making machine by aligning the pinch roller fins of the pipe making machine with the positioning protrusions during pipe making, thereby enabling the first and second fitting portions to be accurately aligned and fitted together reliably. [Effects of the Invention]

[0016] The strip-shaped member for rehabilitating an existing pipe according to the present invention can facilitate the production of a spiral-shaped rehabilitating pipe. Also, the strip-shaped member for rehabilitating an existing pipe according to the second feature can make the outer surface of the rehabilitating pipe as smooth as possible without interfering with the production of the rehabilitating pipe, thereby preventing the ground surface from subsiding. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a cross-sectional view of an existing pipe that has been rehabilitated with a rehabilitation pipe made of a strip-shaped member according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view perpendicular to the longitudinal direction of the belt-shaped member. [Figure 3] FIG. 3 is a cross-sectional view showing the state of engagement between the pinch rollers of the pipe making machine and the belt-shaped member during pipe making. [Figure 4] FIG. 4 is an enlarged cross-sectional view of the circle IV in FIG. [Figure 5] FIG. 5 is a cross-sectional view perpendicular to the longitudinal direction of a belt-shaped member according to a second embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged cross-sectional view showing a part of an existing pipe that has been rehabilitated with a rehabilitating pipe made of a strip-shaped member according to the second embodiment. [Figure 7] FIG. 7 is a cross-sectional view perpendicular to the longitudinal direction of a belt-shaped member according to a third embodiment of the present invention. [Figure 8]FIG. 8 is a cross-sectional view showing the state of engagement between the pinch rollers of the pipe making machine and the belt-shaped member during pipe making in the third embodiment. [Figure 9] FIG. 9 is a cross-sectional view perpendicular to the longitudinal direction of a belt-shaped member according to a fourth embodiment of the present invention. [Figure 10] FIG. 10 is an enlarged cross-sectional view showing a part of an existing pipe that has been rehabilitated with a rehabilitating pipe made of a strip-shaped member according to the fourth embodiment. [Figure 11] FIG. 11 is a cross-sectional view perpendicular to the longitudinal direction of a belt-shaped member according to a fifth embodiment of the present invention. [Figure 12] FIG. 12 is a cross-sectional view showing the state of engagement between the pinch rollers of the pipe making machine and the belt-shaped member during pipe making in the fifth embodiment. [Figure 13] FIG. 13 is an enlarged cross-sectional view showing a part of an existing pipe that has been rehabilitated with a rehabilitating pipe made of a strip-shaped member according to the fifth embodiment. [Figure 14] FIG. 14 is a cross-sectional view perpendicular to the longitudinal direction of a belt-shaped member according to a sixth embodiment of the present invention. [Figure 15] FIG. 15 is a cross-sectional view showing the state of engagement between the pinch rollers of the pipe making machine and the belt-shaped member during pipe making in the sixth embodiment. [Figure 16] FIG. 16 is an enlarged cross-sectional view showing a part of an existing pipe that has been rehabilitated with a rehabilitating pipe made of a strip-shaped member according to the sixth embodiment. [Figure 17] FIG. 17 is a cross-sectional perspective view of a portion of a belt-shaped member according to a seventh embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First Embodiment As shown in Figure 1, a spiral rehabilitation pipe 9 is lined around the inner periphery of an aged existing pipe 1. This rehabilitates the existing pipe 1. The existing pipe 1 is, for example, a sewer pipe buried underground. A rehabilitation pipe 9 is installed for each sewer pipe between two manholes 4. The existing pipe 1 to be rehabilitated is not limited to a sewer pipe, but may also be a water supply pipe, an agricultural water pipe, a water pipe for hydroelectric power generation, a gas pipe, a tunnel, or the like.

[0019] Preferably, the rehabilitation pipe 9 is a self-supporting pipe that provides the required strength by itself without relying on the strength of the existing pipe 1. No backfill material is filled between the inner periphery of the existing pipe 1 and the rehabilitation pipe 9 to structurally integrate the two. The rehabilitation pipe 9 is constructed using a backfill-less construction method. Preferably, the rehabilitation pipe 9 is attached to the inner surface of the existing pipe 1 around its entire circumference, with almost no gap formed between the outer surface of the rehabilitation pipe 9 and the inner surface of the existing pipe 1. At the pipe opening connected to the manhole 4, it is preferable to provide a water-stop material (not shown) between the inner periphery of the existing pipe 1 and the outer periphery of the rehabilitation pipe 9.

[0020] The rehabilitation pipe 9 is made up of a strip-shaped member 10 (profile) for rehabilitating an existing pipe. The strip-shaped member 10 is wound spirally to form the spiral rehabilitation pipe 9. The material of the strip-shaped member 10 is a synthetic resin such as polyvinyl chloride. The strip-shaped member 10 is formed by extrusion molding of the synthetic resin. The strip-shaped member 10 has enough rigidity to make the rehabilitation pipe 9 a self-supporting pipe.

[0021] As shown in Fig. 2, the belt-shaped member 10 includes a bottom plate portion 11, a cover plate portion 12, fitting portions 13 and 14, and a plurality of vertical plate portions 15, and extends in a direction perpendicular to the plane of the paper in Fig. 2. The cross section perpendicular to the longitudinal direction of the belt-shaped member 10 is formed to have a constant shape. In other words, the cross-sectional shape is the same at any position in the longitudinal direction of the belt-shaped member 10.

[0022] The bottom plate 11 constitutes the inner pipe wall 9a (FIG. 1) of the rehabilitating pipe 9 and is formed as a flat, strip-like plate with a uniform thickness. The cover plate 12 constitutes the outer pipe wall 9b (FIG. 1) of the rehabilitating pipe 9 and is formed as a flat, strip-like plate with a uniform thickness, and covers the outer periphery of the bottom plate 11 (upper side in FIG. 2). The thickness of the cover plate 12 is preferably approximately the same as that of the bottom plate 11. The cover plate 12 and the bottom plate 11 face each other and are spaced apart in the thickness direction of the strip-shaped member 10 (up and down in FIG. 2). The cover plate 12 is positioned offset toward one end in the width direction (left side in FIG. 2) relative to the bottom plate 11. Therefore, one end 12f in the width direction of the cover plate 12 extends toward one end (left side in FIG. 2) beyond the bottom plate 11. The other end 11e in the width direction of the bottom plate portion 11 extends further toward the other end side (right side in FIG. 2) than the cover plate portion 12. The cover plate portion 12 covers preferably 80% or more of the width direction of the bottom plate portion 11 excluding the other end 11e from the outer periphery side (upper side in FIG. 2), and more preferably covers the entire portion (100%) of the bottom plate portion 11 excluding the other end 11e from the outer periphery side (upper side in FIG. 2) as in this embodiment.

[0023] A first fitting portion 13 is provided at one end in the width direction of the plate portions 11, 12, and therefore at one end of the strip-shaped member 10 (the left side in FIG. 2). The first fitting portion 13 is formed in a roughly triangular cross-sectional shape having a fitting groove 13a that opens to the inner circumferential side (the lower side in FIG. 2). The first fitting portion 13 protrudes from the bottom plate portion 11 to one end in the width direction (the left side in FIG. 2) and is raised from the bottom plate portion 11 to the outer circumferential side (upward in FIG. 2).

[0024] One widthwise end 12f of the cover plate 12 covers the outer periphery (upper side in FIG. 2) of the first fitting portion 13. In other words, the first fitting portion 13 is covered from the outer periphery by one widthwise end 12f of the cover plate 12. The first fitting portion 13 is supported by and connected to both the bottom plate 11 and the cover plate 12. It is sufficient that the first fitting portion 13 is connected to at least one of the bottom plate 11 and the cover plate 12.

[0025] 2, a second fitting portion 14 is provided in a portion 11e of the bottom plate portion 11 that extends beyond the cover plate portion 12 toward the other end in the width direction (to the right in FIG. 2). The second fitting portion 14 is formed in a cross-sectional shape that is generally arrow-shaped, and protrudes from the bottom plate portion 11 toward the outer periphery.

[0026] As shown in FIG. 2, a plurality of vertical plate portions 15 are provided between the bottom plate portion 11 and the cover plate portion 12. Each vertical plate portion 15 stands in the thickness direction of the strip-shaped member 10. The plurality of vertical plate portions 15 are arranged at intervals in the width direction of the strip-shaped member 10. Of these vertical plate portions 15, vertical plate portion 15A at one end in the width direction connects the top of the first fitting portion 13 and the cover plate portion 12. The vertical plate portions 15 other than vertical plate portion 15A connect the bottom plate portion 11 and the cover plate portion 12.

[0027] The cover plate 12 is continuous and straddles these vertical plate portions 15. One widthwise end 12f of the cover plate 12 extends further toward one end (left side in FIG. 2) than the vertical plate portion 15A. The other widthwise end of the cover plate 12 intersects with the outer peripheral end (upper end in FIG. 2) of the vertical plate portion 15B closest to the other end (right end in FIG. 2).

[0028] As shown in Figure 2, a plurality of hollow portions 19 are formed between the bottom plate portion 11 and the cover plate portion 12 of the belt-shaped member 10. Each hollow portion 19 is defined by the bottom plate portion 11, the cover plate portion 12, and a vertical plate portion 15 adjacent to the bottom plate portion 11 and the cover plate portion 12 in the width direction. A portion of a hollow portion 19A at one end side of the belt-shaped member 10 in the width direction (the left end in Figure 2) is defined by a first fitting portion 13. These hollow portions 19 are arranged side by side in the width direction of the belt-shaped member 10. Adjacent hollow portions 19 are separated from each other by the vertical plate portion 15.

[0029] As shown in FIGS. 1 and 4, in the helical rehabilitating pipe 9, adjacent mating portions 13, 14, which are offset from one another by one revolution, are fitted together on the helically wound strip-shaped member 10. That is, the convex second mating portion 14 is fitted into the mating groove 13a of the first mating portion 13. Furthermore, the offset portions of both widthwise ends of the bottom plate portion 11 abut against each other to form a helical seam 9c, and the offset portions of both widthwise ends of the cover plate portion 12 abut against each other to form a helical seam 9d. The seam 9c appears on the inner circumferential surface of the rehabilitating pipe 9. The seam 9d appears on the outer circumferential surface of the rehabilitating pipe 9. As indicated by the two-dot chain line in FIG. 4, the seams 9c, 9d may be provided with a water-stop material (not shown).

[0030] As shown in FIGS. 1 and 3, when producing a rehabilitating pipe 9 from a strip-shaped member 10, a pipe producing machine (see Patent Documents 1 to 3) is used to spirally wind the strip-shaped member 10 and engage the adjacent first and second engaging portions 13 and 14. At this time, a pair of pinch rollers 31 and 32 of the pipe producing machine pinch the strip-shaped member 10 and apply a driving force. Fins 33A to 33C of the outer pinch roller 31, which faces the cover plate 12, are engaged with the strip-shaped member 10. Specifically, the fin 33A is attached to the edge of one widthwise end 12f of the cover plate 12, and the fin 33B is attached to the outer surface of the vertical plate 15B at the other widthwise end. The pair of fins 33C are attached to both side surfaces of the second engaging portion 14. As a result, even if the outer periphery of the strip-shaped member 10 is configured with a flat cover plate portion 12, the strip-shaped member 10 can be positioned in the width direction relative to the pipe making machine, and the first and second fitting portions 13, 14 can be accurately aligned and reliably fitted together. Furthermore, the strip-shaped member 10 is easier to bend and deform than a strip-shaped member with a simple thick-walled flat plate shape. As a result, pipe making can be performed easily.

[0031] Preferably, the rehabilitating pipe 9 is attached to the entire circumference of the existing pipe 1. As a method of attachment, for example, as described in Patent Document 2, an expanded pipe may be produced by twisting the rehabilitating pipe 9 in the radial direction to slide the mating portions 13, 14 against each other along the winding direction, or a pipe may be attached by utilizing the elasticity of the strip-shaped member 10 using the pipe-making machine described in Patent Document 3. The pipe-making machine described in Patent Document 1 may also be used to overfeed the strip-shaped member 10 while applying the brakes to the machine to produce an expanded diameter pipe. This can ensure that almost no gap is formed between the inner surface of the existing pipe 1 and the outer surface of the rehabilitating pipe 9. Therefore, a backfill-less construction method can be adopted, which omits the need for backfill material between the existing pipe 1 and the rehabilitating pipe 9.

[0032] In the rehabilitating pipe 9 manufactured in this manner, the outer pipe wall portion 9a is formed by a smooth cover plate portion 12. This prevents the formation of recesses on the outer periphery of the rehabilitating pipe 9. Therefore, even if no backfill material is filled between the existing pipe 1 and the rehabilitating pipe 9, it is possible to prevent groundwater and earth and sand from flowing into the recesses on the outer periphery of the rehabilitating pipe 9, and to prevent the ground surface from collapsing. Furthermore, the belt-shaped member 10 and thus the rehabilitation pipe 9 have a plurality of hollow portions 19, which increases rigidity, suppresses cross-sectional deformation, and ensures self-standing strength.

[0033] Next, other embodiments of the present invention will be described. In the following embodiments, the same components as those already described will be denoted by the same reference numerals in the drawings, and the description thereof will be omitted as appropriate. <Second embodiment (FIGS. 5 and 6)> As shown in Fig. 5, in the belt-shaped member 10B of the second embodiment, the first fitting portion 13 is formed with an uneven cross-sectional shape having two (plural) fitting grooves 13b and fitting protrusions 13d alternately. Each fitting groove 13b opens to the inner circumferential side (the lower side in Fig. 5), and the fitting protrusions 13d protrude to the inner circumferential side (the lower side in Fig. 5). The first fitting portion 13 protrudes from the bottom plate portion 11 toward one end side in the width direction (the left side in Fig. 5). One end portion 12f in the width direction of the cover plate portion 12 extends beyond the bottom plate portion 11 and covers the first fitting portion 13 from the outer circumferential side.

[0034] In the strip-shaped member 10B, all four (plural) vertical plate portions 15, including the vertical plate portion at one end in the width direction, connect the cover plate portion 12 and the bottom plate portion 11. The strip-shaped member 10B does not have a vertical plate portion 15A (FIG. 2) that connects the cover plate portion 12 and the first fitting portion 13. The first fitting portion 13 is connected only to the bottom plate portion 11.

[0035] The second fitting portion 14 at the other end 11e in the width direction of the bottom plate portion 11 of the belt-shaped member 10B has two (plural) fitting protrusions 14b and fitting grooves 14d arranged alternately, and is formed with a convex-concave cross-sectional shape that is complementary to the first fitting portion 13. Each fitting protrusion 14b protrudes toward the outer periphery (upper side in FIG. 5), and the fitting grooves 14d open toward the outer periphery (upper side in FIG. 5).

[0036] As shown in Figure 6, in a rehabilitation pipe 9 made of a strip-shaped member 10B, fitting protrusions 14b are fitted into fitting grooves 13b in fitting portions 13, 14 adjacent to each other but one turn apart on the spirally wound strip-shaped member 10, and fitting protrusions 13d are fitted into fitting grooves 14d. This increases the fitting strength. A cover plate 12 constituting the outer pipe wall portion 9b covers the outer periphery of these fitting portions 13, 14 (upper side in Figure 6). In the second embodiment, as in the first embodiment, depressions in the outer peripheral surface of the rehabilitation pipe 9 are almost completely eliminated, thereby preventing depressions.

[0037] <Third embodiment (FIGS. 7 and 8)> As shown in Fig. 7, the belt-shaped member 10C of the third embodiment is provided with a positioning protrusion 17. The positioning protrusion 17 protrudes toward the outer periphery (upward in Fig. 7) from a portion between the vertical plate portion 15B and the second fitting portion 14 at the other end 11f in the width direction of the bottom plate portion 11. The height of the positioning protrusion 17 is higher than the second fitting portion 14 and lower than the vertical plate portion 15.

[0038] As shown in FIG. 8, in the pipe making machine of the third embodiment, fins 33A, 33D, and 33E of the outer pinch roller 31 are engaged with the strip-shaped member 10C. The thickness of the fin 33D is approximately equal to the distance between the vertical plate portion 15B and the positioning protrusion 17. The fin 33D is inserted between the vertical plate portion 15B and the positioning protrusion 17. The fin 33E is also attached to the side of the positioning protrusion 17 facing the second fitting portion 4. The positioning protrusion 17 is sandwiched between the fins 33D and 33E. This allows the strip-shaped member 10 to be accurately positioned in the width direction (left and right in FIG. 8) relative to the pipe making machine during pipe making. Therefore, the first and second fitting portions 13 and 14 can be accurately aligned and reliably fitted together.

[0039] <Fourth embodiment (FIGS. 9 and 10)> As shown in Fig. 9, the belt-shaped member 10D of the fourth embodiment has a double first fitting portion 13 and a double second fitting portion 14. Specifically, two first fitting portions 13 are provided side by side at one end portion in the width direction of the belt-shaped member 10D (the left end portion in Fig. 9). The bottoms of these first fitting portions 13 are directly connected to each other, and the bottom portion of the first fitting portion 13 on the bottom plate portion 11 side is connected to the bottom plate portion 11. In addition, the top portion of each first fitting portion 13 is connected to one end portion 12f in the width direction of the cover plate portion 12 via a vertical plate portion 15A. At the other end 11e of the bottom plate portion 11 in the width direction, two second fitting portions 14 are provided side by side.

[0040] 10, during pipe manufacturing in the fourth embodiment, each second fitting portion 14 is fitted into the corresponding first fitting portion 13. The belt-shaped member 10D is manufactured so that it is attached to the inner peripheral surface of the existing pipe 1 over its entire circumference. Therefore, there is almost no gap between the inner peripheral surface of the existing pipe 1 and the rehabilitating pipe 9.

[0041] The preferred method of attachment is expansion pipe manufacturing (see Patent Document 2). Specifically, after manufacturing the rehabilitating pipe 9 to a diameter smaller than the inner diameter of the existing pipe 1, the rehabilitating pipe 9 is twisted in the diameter expansion direction and attached to the inner surface of the existing pipe 1. When manufacturing the pipe to the smaller diameter, the two second fitting portions 14 are fitted into the corresponding first fitting portions 13. The double fitting structure ensures reliable pipe manufacturing. The base of one of the second fitting portions 14C is then cut off and separated from the bottom plate portion 11. Preferably, the second fitting portion 14C has an easy-to-cut portion 14e, such as a constricted groove. This allows the remaining fitted fitting portions 13, 14D to slide easily against each other in the winding direction, making it easier to twist the rehabilitating pipe 9 to expand its diameter. If one of the second fitting portions 14C can slide without being cut, the rehabilitation pipe 9 may be twisted to expand (expand) without being cut.

[0042] <Fifth embodiment (Figs. 11 to 13) As shown in Fig. 11, in the belt-shaped member 10E of the fifth embodiment, a vertical plate portion 15E located in the middle in the width direction has two adjacent vertical plate portions 15d. A groove 15c is formed between these vertical plate portions 15d. The groove 15c opens to the outer peripheral surface (top surface in Fig. 11) of the cover plate portion 12 and thus the belt-shaped member 10E. Therefore, the cover plate portion 12 is divided in the width direction by the groove 15c. The total width of the portion of the cover plate portion 12 facing the bottom plate portion 11 (excluding one end portion 12f in the width direction) is larger than the total width of the groove 15c, preferably sufficiently larger than the total width of the groove 15c, for example, several times or more the total width of the groove 15c.

[0043] A filler 20 is provided over the entire area of ​​the recessed groove 15c. Preferably, the surface of the filler 20 exposed on the outer periphery is flush with the outer periphery of the cover plate portion 12. The filler 20 is made of an elastic material and can be elastically compressed toward the inner periphery (downward in FIG. 11). Examples of the elastic material include elastomer, rubber, urethane, sponge, semi-hardened filler, and slow-foaming and expanding material.

[0044] An elastic material 22 is attached to the outer surface of the vertical plate portion 15B at the other end side in the width direction of the belt-shaped member 10E (the right side in FIG. 11). The material of the elastic material 22 may be the same as or different from the material of the filler 20. The filling of the filler 20 and the attachment of the elastic material 22 are preferably carried out before the pipe is made, and more preferably, are carried out in parallel with the extrusion molding of the strip-shaped member 10E.

[0045] As shown in Figure 12, during pipe production in the fifth embodiment, the fins 33F of the outer pinch rollers 31 of the pipe production machine are inserted into the recessed grooves 15c. This allows the strip-shaped member 10E to be accurately positioned in the width direction relative to the pipe production machine, and the mating portions 13, 14 to be reliably fitted together. The fins 33B of the outer pinch roller 31 are attached to the vertical plate portion 15B via the elastic material 22.

[0046] As the fins 33F are inserted into the recessed grooves 15c, the filler 20 is elastically compressed toward the inner periphery. When the fins 33F are then removed from the recessed grooves 15c, the filler 20 elastically returns toward the outer periphery. This prevents the recessed grooves 15c from becoming voids in the rehabilitation pipe 9 made of the strip-shaped member 10E, as shown in Fig. 13. This prevents groundwater and earth and sand from flowing into the recessed grooves 15c, thereby preventing subsidence. In the rehabilitation pipe 9, one end 12f in the width direction of the cover plate portion 12 of the spirally wound strip-shaped member 10E abuts against the vertical plate portion 15B via the elastic member 22.

[0047] Sixth Embodiment (FIGS. 14 to 16) As shown in Figure 14, the strip-shaped member 10F in the sixth embodiment has a groove 15c and a filler 20, similar to the fifth embodiment (Figure 11), and has double first and second fitting portions 13 and 14, similar to the fourth embodiment (Figure 9).

[0048] As shown in Figure 15, during pipe production in the sixth embodiment, the fins 33F of the outer pinch rollers 31 of the pipe production machine are inserted into the recessed grooves 15c, as in the fifth embodiment (Figure 12). This allows the strip-shaped member 10F to be accurately positioned in the width direction relative to the pipe production machine, and the mating portions 13, 14 to be reliably fitted together. As shown in FIG. 16, a rehabilitation pipe 9 can be attached to the inner peripheral surface of the existing pipe 1 by further performing pipe expansion or the like.

[0049] Seventh embodiment (FIG. 17) As shown in Fig. 17, the strip-shaped member 10G in the seventh embodiment is similar to the sixth embodiment (Fig. 14) in that it has a recessed groove 15c and has a double first fitting portion 13 and double second fitting portions 14C and 14D. Meanwhile, the recessed groove 15c is hollow, and the filler 20 (Fig. 14) is omitted. A dividing groove 12g is formed between the portions of the cover plate 12 that are continuous with the tops of the two first fitting portions 13, separating them. The hollow portion 13g between the two first fitting portions 13 opens to the outer peripheral surface of the strip-shaped member 10G via the dividing groove 12g. In the rehabilitation pipe 9 made of the strip-shaped member 10G, groundwater and earth and sand can flow into the recessed groove 15c and the hollow portion 13g, but by narrowing the opening width of the recessed groove 15c and the dividing groove 12g, the amount of inflow can be reduced, thereby preventing the ground surface from collapsing.

[0050] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the cover plate portion 12 only needs to cover the outer periphery of the bottom plate portion 11, and one widthwise end portion 12f of the cover plate portion 12 does not necessarily need to extend beyond the bottom plate portion 11 toward one widthwise end side, and the cover plate portion 12 does not necessarily need to cover the outer periphery of the first fitting portion 13. The first fitting portion may be a convex portion that protrudes toward the inner periphery, and the second fitting portion may be a concave portion that opens toward the outer periphery. The number of vertical plate portions 15 is not limited to four or five as in the embodiment, but may be two or three, or six or more. Multiple embodiments may be combined with each other. For example, in the fourth and sixth embodiments, similar to the first embodiment, etc., it is not limited to expansion pipe making, but pasting pipe making may be performed using a pipe making machine such as those disclosed in Patent Documents 1 and 3. The positioning protrusion 17 of the third embodiment (Figs. 7 and 8) may be provided on a strip-shaped member of an embodiment other than the third embodiment. To further increase the rigidity of the strip-shaped member, a brace may be provided in the hollow portion 19. The vertical plate portion 16d may be formed to have an arc-shaped cross section, or a pair of adjacent vertical plate portions 16d may be formed to have a generally circular cross section as a whole. The cover plate portion 12 may be divided into a plurality of cover plate portions in the width direction, each of which is connected to the bottom plate portion 11 via a vertical plate portion 15, and slits may be formed between the opposing ends of adjacent cover plate portions, which slits connect to the hollow portion 19. In this case, it is preferable to provide a filler material in the slits to prevent the inflow of groundwater and earth and sand. [Industrial Applicability]

[0051] The present invention can be applied to a technology for rehabilitating existing buried pipes such as aged sewer pipes. [Explanation of symbols]

[0052] 1 Existing pipes 9 Rehabilitation pipe 9a Inner pipe wall 9b Outer pipe wall 9c Inner seam 9d Outer seam 10. Belt-shaped member 10B~10G Strip-shaped members 11 Bottom plate part 11e Other end in width direction 12 Lid plate part 12f One end in the width direction 12g split groove 13 First fitting part 14 Second fitting part 15 Vertical plate section 15c groove 15d Vertical plate part 17 Positioning protrusion 19 Hollow part 20 Filling material 31 outer pinch roller 33A~33F fins

Claims

[Claim 1] A belt-shaped member for rehabilitating an existing pipe made of synthetic resin that constitutes a spiral tubular rehabilitation pipe that is lined on the inner periphery of an existing pipe, a bottom plate portion that constitutes a pipe wall portion on an inner circumferential side of the rehabilitating pipe; a first fitting portion provided so as to protrude from the bottom plate portion toward one end side of the width direction of the belt-shaped member and to protrude from the bottom plate portion toward an outer periphery side of the thickness direction of the belt-shaped member; a second fitting portion provided at the other end of the bottom plate portion in the width direction, the second fitting portion fitting radially into the first fitting portion in the rehabilitating pipe; a vertical plate portion extending from the one end of the bottom plate portion toward the outer periphery, the vertical plate portion being higher than the first fitting portion and the second fitting portion and forming a groove between the vertical plate portion and the raised first fitting portion; a cover plate portion that intersects with the outer peripheral end of the vertical plate portion, is integrally connected to the bottom plate portion via the vertical plate portion, and constitutes a pipe wall portion on the outer peripheral side of the rehabilitating pipe; wherein the cover plate portion extends from the bottom plate portion and the vertical plate portion toward one end in the width direction and covers the outer periphery of the first fitting portion at a distance, thereby forming a space between the cover plate portion and the first fitting portion, and the space is connected to the groove.

Images