Strip-shaped member for rehabilitation of existing pipes and method for rehabilitation of existing pipes

Abstract

In the rehabilitation of existing pipes using the expansion method, this prevents unintended expansion of each part of the rehabilitation pipe in the axial direction before the point at which it should be expanded. [Solution] A spiral-shaped rehabilitated pipe 3 is formed by interlocking the opposing edges 11e and 11d of a long, spirally wound strip member 10, which are one rotation apart. This pipe is manufactured to a diameter smaller than the inner diameter of the existing pipe 1 and installed inside the existing pipe 1. The restraining force between the edges 11e and 11d in the winding direction is then weakened to expand the circumference of the rehabilitated pipe 3. Anti-slip reinforcing grooves 43 are formed in the auxiliary protrusions 42 formed on the edge 11d of the strip member 10. During the manufacturing process, the auxiliary protrusions 42 on the edge 11d and the auxiliary grooves 32a on the edge 11e are interlocked with an anti-slip agent 34 in between, and the auxiliary protrusions 42 are cut during the weakening process.

Description

Technical Field

[0001] The present invention relates to a strip member and a method for rehabilitating an existing pipe, such as an aging sewer pipe, and particularly to a strip member used in a so-called expand method in which a spiral tubular rehabilitation pipe formed by spirally winding a strip member is installed in an existing pipe and then the circumference of the rehabilitation pipe is expanded.

Background Art

[0002] As one of the methods for rehabilitating existing pipes such as aging sewer pipes, an expand method is known. As disclosed in Patent Document 1, in the expand method, a long strip member (profile) made of synthetic resin is spirally wound using a push-type pipe making machine (see Patent Document 2, etc.) to make the spiral edges of the strip members with one turn difference fit into each other with unevenness, thereby manufacturing a spiral tubular rehabilitation pipe with a smaller diameter than the existing pipe, and extruding the manufactured rehabilitation pipe from the pipe making machine and installing it in the existing pipe. Subsequently, after preventing the rotation of the end on the arrival side opposite to the push side of the rehabilitation pipe, while further driving the pipe making machine, sequentially from the end on the arrival side toward the push side, by weakening the restraining force in the winding direction of the spirally engaged strip edges, the strip edges are slid in the winding direction to expand (increase the diameter) the circumference of the rehabilitation pipe and attach the rehabilitation pipe to the inner circumference of the existing pipe.

[0003] Patent Documents 3 and 4 disclose strip members for the expand method. Two ridges are formed on one strip edge in the strip width direction of the strip member, and two grooves are formed on the other strip edge. A slip preventive made of a hot melt adhesive or the like is provided in advance inside the auxiliary groove among the two grooves. During pipe manufacturing, a cutting wire is sandwiched between the two strip edges, and the corresponding ridges and grooves are fitted to form a spiral fitting strip. Then, when the cutting wire is pulled out, the auxiliary ridge fitted to the auxiliary groove among the two ridges is cut from the root. As a result, the restraining force in the winding direction of the strip edges is weakened, and the rehabilitation pipe can be expanded in circumference (increased in diameter).

Prior Art Documents

[0004] [Patent Document 1] Special Publication No. 02-504543 [Patent Document 2] Japanese Patent Publication No. 2012-000786 [Patent Document 3] Japanese Patent Publication No. 2024-046165 [Patent Document 4] Japanese Patent Publication No. 2024-085730 [Overview of the project] [Problems that the invention aims to solve]

[0005] In the expanded pipe method described in the aforementioned Patent Documents 3-4, each portion of the rehabilitated pipe in the axial direction after pipe manufacturing is prevented from slipping along the winding direction by an anti-slip agent between the auxiliary protrusions and auxiliary grooves, so as to prevent the interlocked edges of the spiral fitting ridges from slipping along the winding direction until that portion is expanded (increased in diameter) by the expansion process. However, if the ambient temperature is high, for example, the anti-slip agent made of hot-melt adhesive may soften, reducing its anti-slip strength. Also, although each part of the rehabilitated pipe in the axial direction is rotated spirally by the drive of the pipe-making machine before being attached to the inner circumference of the existing pipe, if the rehabilitated pipe itself is heavy, or if it encounters strong resistance due to steps or bends in the existing pipe, or if the resistance during expansion is strong, the spiral rotation may be hindered, and the sliding load in the spiral fitting groove may exceed the set anti-slip force. As a result, a part of the rehabilitated pipe in the axial direction may be unintentionally expanded before the point at which it should be expanded. For example, if the initial pushing part or the middle part of the rehabilitated pipe is unintentionally expanded and attached to the inner circumference of the existing pipe, the part that reaches beyond that part may not be able to expand during the subsequent expansion process, resulting in poor adhesion. In view of these circumstances, the present invention aims to prevent the unintended expansion of each portion of the rehabilitated pipe in the axial direction before the point at which it should be expanded, during the rehabilitation of existing pipes by the expansion method. [Means for solving the problem]

[0006] To solve the aforementioned problems, the present invention provides a band-shaped member which is wound in a spiral shape and has opposing band edges that are one turn apart interlocked, thereby forming a spiral-shaped rehabilitated pipe that follows the inner circumference of an existing pipe, and further expands the circumference of the rehabilitated pipe by weakening the restraining force between the band edges in the winding direction, The band body is made of synthetic resin, An auxiliary groove is provided on one edge of the band body in the band width direction, Provided on the other edge of the band body in the band width direction, and fitted in the rehabilitation tube with the auxiliary protrusion and anti-slip agent sandwiched in between, and the auxiliary protrusion that can be cut for weakening, The invention is characterized by having anti-slip reinforcing grooves formed on at least one of the outer surface of the auxiliary protrusions and the inner surface of the auxiliary recesses.

[0007] In the rehabilitated pipe manufactured using the strip-shaped member, a spiral interlocking strip is formed by the interlocking grooves of the strip edges. An anti-slip agent is interposed between the interlocking auxiliary grooves and auxiliary protrusions of the spiral interlocking strip. Furthermore, at least one of the outer surface of the auxiliary protrusions and the inner surface of the auxiliary grooves becomes uneven due to the anti-slip reinforcing grooves, causing it to bite into the anti-slip agent. This firmly prevents the auxiliary grooves and auxiliary protrusions from slipping against each other in the winding direction. Therefore, even if sliding loads due to the weight of the rehabilitated pipe or contact with steps or bends in the existing pipe act on the spiral interlocking strip from the time of pipe manufacturing when the auxiliary grooves and auxiliary protrusions are interlocked until the restraining force weakens when the auxiliary protrusions are cut, the interlocking grooves of the spiral interlocking strips can be reliably restrained in the winding direction against these sliding loads. This prevents the formation of unintended expansions in the portion of the rehabilitated pipe that should not yet be expanded in the axial direction (the portion of the rehabilitated pipe before normal expansion). As a result, it prevents the portion of the rehabilitated pipe opposite to the pipe-making machine side (the pushing side) (the receiving side) from becoming unable to expand during the normal expansion process. Ultimately, this ensures that the rehabilitated pipe can be reliably expanded and manufactured throughout its entire length. Preferably, the strip body is provided with main grooves and main ridges on both sides of the strip edges. In the rehabilitation pipe, the main grooves and main ridges are fitted together.

[0008] Preferably, the anti-slip reinforcing groove is formed on the outer surface of the auxiliary protrusion. This makes it easier to form anti-slip reinforcement grooves.

[0009] Preferably, the anti-slip reinforcing groove includes a plurality of grooves spaced apart in the longitudinal direction of the strip. This ensures that the anti-slip force in the winding direction is reliably generated by the anti-slip agent and the anti-slip reinforcing grooves.

[0010] Preferably, the groove extends in the direction of the width of the strip. This enhances the anti-slip force in the winding direction through the anti-slip agent and anti-slip reinforcing grooves.

[0011] Preferably, the anti-slip agent is provided within the auxiliary groove. This allows for the stable placement of the anti-slip agent on the strip-shaped member.

[0012] The present invention is a method for rehabilitating an existing pipe, in which a spiral-shaped rehabilitation pipe is formed by interlocking the opposing edges of a long, spirally wound strip member, which are one circumference apart, is manufactured to have a smaller diameter than the inner diameter of the existing pipe and installed inside the existing pipe, and then the restraining force between the edges in the winding direction is weakened to expand the circumference of the rehabilitation pipe. After the extrusion molding of the strip-shaped member and before the pipe manufacturing process, a non-slip reinforcing groove is formed on at least one of the auxiliary protrusions and auxiliary recesses formed on the opposing strip edges of the strip-shaped member. The method is characterized by fitting the auxiliary protrusions and auxiliary grooves together with an anti-slip agent in between during the pipe manufacturing process, and cutting the auxiliary protrusions during the weakening process. According to the method of the present invention, the anti-slip agent and the anti-slip reinforcing groove can enhance the anti-slip force between the auxiliary convex ridges and the auxiliary concave grooves. As a result, it is possible to prevent the formation of an unexpected expansion part in the pre-renewal pipe part in the pipe axis direction of the renewal pipe that should not be expanded yet. Consequently, it is possible to prevent the renewal pipe part on the reaching side from becoming non-expandable due to such an unexpected expansion part. Preferably, after the extrusion molding of the belt-like member and before the pipe manufacturing, the anti-slip reinforcing groove is formed on the outer surface of the auxiliary convex ridge, and the anti-slip agent is provided inside the auxiliary concave groove.

Effect of the Invention

[0013] According to the present invention, in the renewal of an existing pipe by the expansion method, it is possible to prevent the unintentional expansion of each part in the pipe axis direction of the renewal pipe before the time when each part should be originally expanded.

Brief Description of the Drawings

[0014] [Figure 1] FIG. 1 is a perspective view of a part in the belt length direction of the belt-like member according to the first embodiment of the present invention. [Figure 2] FIG. 2(a) shows the auxiliary convex ridge of the belt-like member and is a plan view along line IIa-IIa in FIG. 2(b). FIG. 2(b) is a side cross-sectional view of the auxiliary convex ridge along line IIb-IIb in FIG. 2(a). FIG. 2(c) is a side cross-sectional view showing a modified example of the anti-slip reinforcing groove of the auxiliary convex ridge. FIG. 2(d) is a side cross-sectional view showing another modified example of the anti-slip reinforcing groove of the auxiliary convex ridge. [Figure 3] FIG. 3(a) shows the renewal pipe made of the belt-like member and is a cross-sectional perspective view along line IIIa-IIIa in FIG. 6. FIG. 3(b) is a cross-sectional perspective view of the renewal pipe during the restraining force weakening process and the expansion process along line IIIb-IIIb in FIG. 7. [Figure 4] FIG. 4 is a cross-sectional view along line IV-IV in FIG. 3(a). [Figure 5] FIG. 5 is a schematic configuration diagram of the manufacturing apparatus for the belt-like member. [Figure 6]FIG. 6 is a front cross-sectional view showing the method for rehabilitating an existing pipe using the strip member in the pipe manufacturing process of the rehabilitated pipe. [Figure 7] FIG. 7 is a front cross-sectional view showing the restraining force weakening step and the expansion step in the existing pipe rehabilitation method. [Figure 8] FIG. 8 is a front cross-sectional view showing the existing pipe rehabilitation method at the end stage of the expansion step. [Figure 9] FIG. 9 shows a second embodiment of the present invention and is a plan view of the auxiliary ridges of the strip member. [Figure 10] FIG. 10 shows a third embodiment of the present invention and is a plan view of the auxiliary ridges of the strip member. [Figure 11] FIG. 11 shows a fourth embodiment of the present invention and is a plan view of the auxiliary ridges of the strip member.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. <First Embodiment (FIGS. 1 to 8)> As shown in FIG. 8, the existing pipe 1 is rehabilitated by lining the rehabilitated pipe 3 on the inner circumference of the aged existing pipe 1. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried underground, but the present invention is not limited thereto, and it may be a water supply pipe, an agricultural water pipe, a gas pipe, a water conduit for hydroelectric power generation, a tunnel, or the like.

[0016] As shown in FIG. 8, the rehabilitated pipe 3 is a spiral pipe formed by manufacturing a strip member 10 (profile) having a long and constant irregular cross-section into a spiral shape by a pipe manufacturing machine 20. Preferably, the rehabilitated pipe 3 is a self-supporting pipe that can bear the required strength as a buried pipe underground alone.

[0017] As shown in Figure 1, the strip-shaped member 10 includes a flat strip-shaped strip body 11, a plurality of ribs 12 integrally formed with the strip body 11, and male and female fitting parts 13, 14. The material of the strip body 11 and thus the strip-shaped member 10 is preferably a synthetic resin such as rigid polyvinyl chloride (PVC) which has corrosion resistance and abrasion resistance. The ribs 12 are formed, for example, hollow and have a square cross-section, and protrude from the strip body 11 toward the outer circumference (outside the pipe of the rehabilitation pipe 3). The plurality of ribs 12 are arranged in the width direction of the strip-shaped member 10. Note that the cross-sectional shape of the ribs 12 is not limited to the above, and may be T-shaped, etc.

[0018] As shown in Figure 1, a female fitting portion 13 is provided on one edge portion 11e of the strip body 11 in the width direction (left side in Figure 1). The female fitting portion 13 includes two raised portions 31 and 32 that protrude outward (upward in Figure 1). The raised portions 31 and 32 are formed side by side in the width direction of the strip. The main raised portion 31 on the outer side in the width direction (left side in Figure 1) has a main groove 31a that opens outward (downward in Figure 1). The auxiliary raised portion 32 is integrally connected to the nearest rib 12A. The auxiliary raised portion 32 has an auxiliary groove 32a that opens outward. The two grooves 31a and 32a are arranged side by side in the width direction of the strip and each extends along the entire length of the strip member 10 in the length direction.

[0019] An anti-slip agent 34 is provided inside the auxiliary groove 32a. The anti-slip agent 34 is made of, for example, a hot-melt adhesive. Preferably, the anti-slip agent 34 is applied to the auxiliary groove 32a during the manufacturing stage of the strip-shaped member 10.

[0020] A male fitting portion 14 is provided on the other side (right side in Figure 1) of the band edge 11d of the band body 11 in the band width direction. The male fitting portion 14 includes two protrusions 41 and 42 that are aligned with each other in the band width direction. The protrusions 41 and 42 are each formed in an arrow-shaped cross-section, protruding outward from the band body 11 and extending along the entire length of the band-shaped member 10 in the band length direction. An auxiliary protrusion 42 is positioned outside the main protrusion 41 in the band width direction (right side in Figure 1). An easy-cut portion 42c, including a constriction and a through hole, is formed at the base of the auxiliary protrusion 42 (the part connected to the band body 11).

[0021] As shown in Figures 1 and 2, anti-slip reinforcing grooves 43 are formed on the top surface 42p (outer surface) of the auxiliary protrusion 42. The anti-slip reinforcing grooves 43 include a plurality of groove portions 43a. The plurality of groove portions 43a are arranged at intervals in the extension direction of the auxiliary protrusion 42, i.e., the band length direction (left-right direction in Figure 2(a)). Each groove portion 43a extends in the width direction of the auxiliary protrusion 42 (up-down direction in Figure 2(a)) so as to be perpendicular to the extension direction of the auxiliary protrusion 42. Both ends of the groove portion 32a in the extension direction reach the slanted surfaces 42a and 42b on both sides of the top surface 42p of the auxiliary protrusion 42. As shown in Figure 2(b), the cross-section perpendicular to the extension direction of the groove portion 43a is rectangular or concave, but is not limited to these, and may be V-shaped (Figure 2(c)) or semicircular (Figure 2(d)), etc.

[0022] As shown in Figure 3(a), in the spiral-shaped rehabilitated pipe 3, the strip member 10 is wound spirally, the strip edges 11e and 11d that are one turn apart are overlapped, and the male and female fitting parts 13 and 14 are fitted together to form a spiral fitting ridge 3s. More specifically, the main recessed groove 31a and the main raised ridge 41 in the male and female fitting parts 13 and 14 are fitted together. A slow-curing adhesive 33 is sandwiched between the inner surface of the main recessed groove 31a and the outer surface of the main raised ridge 41.

[0023] The auxiliary grooves 32a and auxiliary protrusions 42 are fitted together in the male and female mating portions 13 and 14. An anti-slip agent 34 is sandwiched between the inner surface of the auxiliary groove 32a and the outer surface of the auxiliary protrusion 42. As shown in Figure 4, preferably, a portion 34a of the anti-slip agent 34 is embedded in each groove 43a. The anti-slip agent 34 and the anti-slip reinforcing grooves 43 are interlocked. In other words, the uneven outer surface of the auxiliary protrusion 42 having the anti-slip reinforcing grooves 43 bites into the anti-slip agent 34.

[0024] As shown in Figure 3(b), the auxiliary protrusions 42 in the rehabilitated pipe 3 at the completion stage are cut at the easily cut section 42c at the base.

[0025] As shown in Figure 5, the production line 59 of the strip-shaped member manufacturing apparatus 50 is arranged in the following order from the upstream side (right side in Figure 5): extrusion molding machine 51, coating nozzle 52, groove forming unit 53, and winding unit 54. The strip-shaped member 10 is extruded and molded from a raw material resin such as polyvinyl chloride by the extrusion molding machine 51. A non-slip agent 34, such as a hot-melt adhesive, is applied from a coating nozzle 52 to the auxiliary grooves 32a of the extruded strip-shaped member 10.

[0026] Furthermore, grooves 43a and thus anti-slip reinforcing grooves 43 are formed on the outer surface of the auxiliary protrusions 42 of the strip-shaped member 10 by the groove-forming portion 53. Note that the process of forming the anti-slip reinforcing grooves 43 may be performed before the application of the anti-slip agent 34. It may also be performed after the extrusion molding of the strip-shaped member 10 and before hardening.

[0027] Subsequently, the strip-shaped member 10 is wound into a roll shape by the winding unit 54. Alternatively, after the strip-shaped member 10 extruded by the extrusion molding machine 51 is wound up, the strip-shaped member 10 may be unwound from the winding section 54, an anti-slip agent 34 may be applied and anti-slip reinforcing grooves 43 may be formed, and then the strip-shaped member 10 may be wound up again into a roll shape.

[0028] The strip-shaped member 10 manufactured in this manner is transported to the rehabilitation construction site of the existing pipe 1 and used for the rehabilitation construction of the existing pipe 1 as follows. <Pipe manufacturing process> As shown in Figure 6, a push-type pipe-making machine 20 is installed in a starting-side manhole 4 connected to the starting-side pipe opening 1d of the existing pipe 1. The pipe-making machine 20 (see Patent Document 2, etc.) includes an annular frame 21 including a helical feed roller 22, a pair of pinch rollers 23 provided on one side of the annular frame 21 in the circumferential direction, a drive motor 24 for the pinch rollers, and a coating nozzle 25.

[0029] The strip-shaped members 10 are sequentially unwound from the drum 5 on the ground, pass through the manhole 4, and are supplied to the pipe-making machine 20. The main groove 31a of the strip-shaped member 10 is filled with a slow-curing adhesive 33 (Figure 1) from the application nozzle 25. Next, the strip-shaped member 10 is wound spirally along the inner circumference of the annular frame 21, and the opposing strip edges 11e and 11d, which are one turn apart, are overlapped. At this time, a restraining force adjustment wire 8 (Figure 3(a)) is sandwiched between the belt edges 11e and 11d. Furthermore, the strip edges 11e and 11d are gripped by the pinch roller pair 23, causing the fitting portions 13 and 14 to interlock, forming a spiral fitting strip 3s. This allows the strip-shaped member 10 to be formed into a spiral-shaped rehabilitated pipe 3.

[0030] As shown in Figure 3(a), the interlocking of the fitting portions 13 and 14 causes the uncured slow-curing adhesive 33 to be sandwiched between the inner surface of the main groove 31a and the main ridge 41. A hot-melt adhesive anti-slip agent 34 is sandwiched between the inner surface of the auxiliary groove 32a and the auxiliary ridge 42. The adhesive force and contact friction force of the anti-slip agent 34 prevent the auxiliary groove 32a and the auxiliary ridge 42 from slipping against each other. Consequently, the band edges 11e and 11d are restrained in the winding direction. In particular, since the auxiliary ridge 42 has anti-slip reinforcing grooves 43 formed therein, the contact area between the anti-slip agent 34 and the auxiliary ridge 42 is increased. Moreover, the outer surface of the auxiliary ridge 42, which has become uneven due to the anti-slip reinforcing grooves 43, bites into the anti-slip agent 34 (Figure 4). This allows for the generation of a large contact friction force between the anti-slip agent 34 and the auxiliary protrusions 42, thereby firmly preventing slippage between the anti-slip agent 34 and the auxiliary protrusions 42. In addition, the inner surface of the auxiliary groove 32a and the anti-slip agent 34 are firmly prevented from slipping due to the adhesive force of the anti-slip agent 34. Even if the annular temperature is high and the anti-slip agent 34 softens, the anti-slip force can be compensated for by the increased contact friction force of the anti-slip agent 34 due to the anti-slip reinforcing grooves 43.

[0031] As shown in Figure 6, the rehabilitated pipe 3 in the pipe manufacturing process is manufactured to have a smaller diameter than the inner diameter of the existing pipe. The rehabilitated pipes 3, once manufactured, are sequentially pushed into the existing pipe 1 while rotating spirally along the spiral feed roller 22. At this time, if the rehabilitated pipe 3 itself is heavy, or if the rehabilitated pipe 3 hits a step or bend on the inner surface of the existing pipe 1, the pushing (spiral rotation) of the rehabilitated pipe 3 may be hindered, causing a force (sliding load) to act on the band edges 11e and 11d of the spiral fitting strip 3s to slide relative to each other along the winding direction. However, since the auxiliary recessed groove 32a and auxiliary protruding strip 42 are firmly prevented from slipping by the action of the anti-slip agent 34 and the anti-slip reinforcing groove 43, the band edges 11e and 11d of the spiral fitting strip 3s can be reliably restrained against the sliding load.

[0032] Therefore, it is possible to prevent the band edges 11e and 11d of the helical fitting strip 3s from unintentionally sliding relative to each other toward the expansion (diameter enlargement) side in the winding direction. This prevents the formation of an unintentionally expanded portion 3g, shown by the dashed line in Figure 6, in the rehabilitated pipe 3 (the portion of the rehabilitated pipe before normal expansion) before the expansion process described later. As a result, the entire rehabilitated pipe 3 during the pipe manufacturing process can be kept smaller in diameter than the existing pipe 1.

[0033] In this way, a rehabilitated pipe 3 consisting of a small-diameter pipe section 3a is installed inside the existing pipe 1. As shown by the dashed line in Figure 6, when the leading end (reaching end) 3e of the rehabilitated pipe 3 reaches the reaching manhole 4B in the pushing direction, the pipe-making machine 20 is temporarily stopped and the pipe end 3e is fixed to the manhole 4B to prevent it from rotating.

[0034] <Restraint force weakening process> Next, as shown in Figures 3(b) and 7, the restraining force adjustment wire 8 is sequentially pulled from the receiving side (left side in Figures 3(b) and 7) to the discharging side (right side in Figures 3(b) and 7) of the rehabilitation pipe 3, thereby cutting the auxiliary protrusion 42 from its base with the restraining force adjustment wire 8. As a result, the restraining force in the winding direction between the band edges 11e and 11d of the helical fitting rib 3s is sequentially weakened from the receiving side to the discharging side of the rehabilitation pipe 3.

[0035] <Expansion Process> As shown in Figure 7, the pipe-making machine 20 is driven in parallel with the withdrawal of the restraining force adjustment wire 8, thereby feeding the subsequent strip-shaped member 10 to the pipe end 3d on the starting side (original pushing side) of the rehabilitated pipe 3. As a result, the small-diameter pipe section 3a from the pipe end 3d to the withdrawal position 8p of the restraining force adjustment wire 8 in the rehabilitated pipe 3 is rotated spirally as a whole. In the portion of the rehabilitated pipe 3 from the withdrawal position 8p to the arrival side (left side in Figure 7), the circumference is expanded as the strip edges 11e and 11d of the spiral fitting strip 3s slide against each other in the winding direction, forming a cone section 3c that expands in diameter toward the arrival side. Furthermore, the large-diameter pipe section 3b on the arrival side (left side in Figure 7) of the rehabilitated pipe 3 beyond the cone section 3c is fixed to the inner circumferential surface of the existing pipe 1. At this stage, the slow-curing adhesive 33 (Figure 3(b)) has not yet hardened and functions as a lubricant that allows or facilitates sliding between the main protrusions 41 and main recesses 31a in the cone portion 3c, and consequently between the band edges 11e and 11d.

[0036] As mentioned above, the formation of the unintentional expansion portion 3g (Figure 6) is prevented during the pipe manufacturing process, so the rehabilitated pipe 3 can be reliably expanded sequentially from the pipe end 3d toward the starting side during the expansion process. If an unintentional expansion portion 3g (Figure 6) is formed during the pipe manufacturing process, then the pipe portion 3h on the receiving side (left side in Figure 6) of the rehabilitated pipe 3 cannot transmit the expansion force during the expansion process and is therefore unable to expand.

[0037] Furthermore, as shown in Figure 7, during the expansion process, if the expansion resistance in the cone section 3c is high, or if the small-diameter pipe section 3a is heavy, or if the small-diameter pipe section 3a hits a step or bend on the inner surface of the existing pipe 1, the spiral rotation of the small-diameter pipe section 3a may be hindered, which can increase the sliding load between the band edges 11e and 11d of the spiral fitting strip 3s in the small-diameter pipe section 3a. In response to this, the anti-slip action of the anti-slip agent 34 and the anti-slip reinforcing groove 43 can reliably restrain the band edges 11e and 11d. Therefore, it is possible to prevent the formation of an unintended expansion section 3g, shown by the dashed line in Figure 7, within the small-diameter pipe section 3a (the rehabilitated pipe section before normal expansion), and to avoid the small-diameter pipe section 3ah on the receiving side (left side in Figure 7) of such an unintended expansion section 3g from becoming unable to expand.

[0038] As a result, as shown in Figure 8, the entire rehabilitated pipe 3 can be reliably expanded (increased in diameter) and attached to the existing pipe 1. Subsequently, as the slow-curing adhesive 33 hardens over time, the main protrusions 41 and the main recessed grooves 31a are bonded and fixed together via the slow-curing adhesive 33. In this way, the existing pipe 1 can be rehabilitated.

[0039] Next, other embodiments of the present invention will be described. In the following embodiments, components that overlap with those described above are denoted by the same reference numerals in the drawings and their descriptions are omitted. The placement, extension direction, shape, etc., of the anti-slip reinforcing grooves 43 are not limited to those of the first embodiment. <Second Embodiment (Figure 9)> As shown in Figure 9, in the second embodiment of the present invention, the anti-slip reinforcing groove 43 is formed biasedly on one of the slanted surfaces 42b of the auxiliary protrusion 42. Each groove portion 43a of the anti-slip reinforcing groove 43 extends along the height direction (up and down direction in Figure 9) of the slanted surface 42b. Multiple groove portions 43a are arranged at intervals from each other in the direction of extension of the slanted surface 42b (left and right direction in Figure 9).

[0040] In Figure 9, the anti-slip reinforcing groove 43 is biased towards the slanted surface 42b on the outer side in the width direction of the strip (opposite to the main ridge 41, the lower side in Figure 9), but it may also be biased towards the slanted surface 42a on the inner side in the width direction of the strip (towards the main ridge 41, the upper side in Figure 9). The anti-slip reinforcing groove 43 may also be formed on the slanted surfaces 42a and 42b on both sides of the auxiliary ridge 42.

[0041] <Third Embodiment (Figure 10)> As shown in Figure 10, in the third embodiment of the present invention, the extension direction of the groove portion 32a of the anti-slip reinforcing groove 43 is oblique to the extension direction of the auxiliary protrusion 42 (left-right direction in Figure 10). The groove portion 32a diagonally crosses the top surface 42p of the auxiliary protrusion 42, and both ends reach the slanted surfaces 42a and 42b, respectively. Furthermore, the slanted groove 32a may be positioned biasedly towards either of the slanted surfaces 42a or 42b.

[0042] <Fourth Embodiment (Figure 11)> As shown in Figure 11, in the fourth embodiment of the present invention, the anti-slip reinforcing groove 43 includes a plurality of circular recessed groove portions 43c. These plurality of circular groove portions 43c are arranged at intervals in the extending direction of the auxiliary protrusion 42. The circular groove portions 43c are formed on the top surface 42p of the auxiliary protrusion 42. The circular groove 43c may be formed on any of the slanted surfaces 42a, 42b. The circular groove 43c may be formed on two or more of the three surfaces 42p, 42a, 42b.

[0043] The present invention is not limited to the above-described embodiments and can be modified in various ways. For example, the anti-slip reinforcing groove 43 may be formed on the inner surface of the auxiliary recess 32a instead of the outer surface of the auxiliary protrusion 42. Alternatively, the anti-slip reinforcing groove 43 may be formed on both the outer surface of the auxiliary protrusion 42 and the inner surface of the auxiliary recess 32a. By forming the anti-slip reinforcing groove 4 on the inner surface of the auxiliary recess 32a, the contact friction force between the auxiliary recess 32a and the anti-slip agent 34 can be increased, and even if the anti-slip agent 34 softens in a high-temperature environment, it is possible to reliably prevent the auxiliary recess 32a and the anti-slip agent 34 from slipping. The anti-slip reinforcing groove 43 may be a groove that extends parallel to the direction of extension of the auxiliary protrusion 42 or auxiliary recess 32a. The process of forming the anti-slip reinforcing grooves 43 only needs to be performed at least before the pipe manufacturing process. The anti-slip reinforcing grooves 43 may also be formed on the strip-shaped member 10 before it is introduced to the pinch roller pair 23 of the pipe manufacturing machine 20 at the construction site of the rehabilitated pipe 3. [Industrial applicability]

[0044] The present invention can be applied, for example, to rehabilitation construction techniques for aging sewer pipes. [Explanation of Symbols]

[0045] 1 Existing pipe 3 Rehabilitation pipe 3a Small diameter pipe section (rehabilitated pipe section before normal expansion) 3g unintentional extension 3s spiral mating strip 10 Strip-shaped member 11e Band edge 11d Band edge 13 Female mating part 14 Male mating part 20 Pipe making machine 32a Auxiliary groove 34 Anti-slip agent 42 Auxiliary protrusions 43 Anti-slip reinforcement grooves 43a Groove 43c Circular groove (groove)

Claims

1. A band-shaped member that is wound in a spiral shape, with opposing band edges that are one rotation apart fitting together in a grooved and recessed manner, thereby forming a spiral-shaped rehabilitated pipe that follows the inner circumference of the existing pipe, and further expandable in circumference by weakening the restraining force between the band edges in the winding direction, The band body is made of synthetic resin, An auxiliary groove is provided on one edge of the band body in the band width direction, Provided on the other edge of the band body in the band width direction, and fitted in the rehabilitation tube with the auxiliary protrusion and anti-slip agent sandwiched in between, and the auxiliary protrusion that can be cut for weakening, A strip-shaped member for rehabilitating existing pipes, comprising the above, characterized in that anti-slip reinforcing grooves are formed on at least one of the outer surface of the auxiliary protrusion and the inner surface of the auxiliary recess.

2. The strip-shaped member according to claim 1, wherein the anti-slip reinforcing groove is formed on the outer surface of the auxiliary protrusion.

3. The strip-shaped member according to claim 1, wherein the anti-slip reinforcing grooves include a plurality of grooves provided at intervals in the direction of the strip length.

4. The strip-shaped member according to claim 3, wherein the groove extends in the direction of the strip width.

5. The strip-shaped member according to any one of claims 1 to 4, wherein the anti-slip agent is provided in the auxiliary groove.

6. A method for rehabilitating an existing pipe, comprising: manufacturing a spiral-shaped rehabilitation pipe, which is formed by interlocking the opposing edges of a long, spirally wound strip member at a one-circumference difference, to a diameter smaller than the inner diameter of the existing pipe and installing it inside the existing pipe; and then weakening the restraining force between the edges in the winding direction to expand the circumference of the rehabilitation pipe, After the extrusion molding of the strip-shaped member and before the pipe manufacturing process, a non-slip reinforcing groove is formed on at least one of the auxiliary protrusions and auxiliary recesses formed on the opposing strip edges of the strip-shaped member. A method for rehabilitating an existing pipe, characterized in that the auxiliary protrusions and auxiliary grooves are fitted together with an anti-slip agent in between during pipe manufacturing, and the auxiliary protrusions are cut during weakening.

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