Belt-like member for renovation and method for renovating existing pipe

Abstract

To provide a belt-like member for renovation and a method for renovating an existing pipe that can reduce a load on a pipe-making machine during pipe manufacturing and ensure a strength of a renovated pipe.SOLUTION: A belt-like member 10 for renovation includes: an inner belt material 11 made of synthetic resin including an inner belt part 12 and a pair of fitting parts 13, 14; and a hollow belt material 20 made of metal. The belt-like member 10 for renovation is wound spirally along an inner wall 1a of an existing pipe 1 to be renovated, and the fitting parts 13, 14 are fitted together to produce a helical renovated pipe 3. An inner circumferential surface 3a of the renovated pipe 3 is formed by the inner belt part 12. The hollow belt material 20 has a hollow belt part 25 formed in a generally rectangular, hollow cross-sectional shape with its longer sides oriented in a belt width direction. The inner belt part 12 covers a base part 21 of the hollow belt material 20 that faces an inside of the renovated pipe. An interior 26 of the hollow belt part 25 is filled with a curable filler material 5.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a belt-shaped member for rehabilitating an existing pipe, such as an aged sewer pipe, and a method for rehabilitating an existing pipe using the belt-shaped member, and in particular to a rehabilitation belt-shaped member that is wound helically around the inner wall of an existing pipe to form a helical rehabilitated pipe, and a method for rehabilitating an existing pipe. [Background technology]

[0002] It is known to rehabilitate an existing pipe, such as an aged sewer pipe, by lining the inner wall of the existing pipe with a rehabilitation pipe. The rehabilitation pipe is, for example, a spiral pipe made from a belt-shaped member. The belt-shaped member is made of synthetic resin such as polyvinyl chloride. Furthermore, a belt-shaped member is known in which a reinforcing material such as steel is incorporated into a main belt material made of synthetic resin. The belt-shaped member is wound in a spiral shape along the inner wall of the existing pipe by a pipe making machine to produce a rehabilitated pipe. A backfilling material is filled into the gap between the inner wall of the existing pipe and the rehabilitated pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-142181 A Summary of the Invention [Problem to be solved by the invention]

[0004] The belt-shaped member, which has reinforcing material made of metal such as steel, has high rigidity, so it places a large load on the pipe-making machine. If we try to further increase the rigidity of the belt-shaped member, it is not possible with a normal pipe-making machine, so there is a limit to how high the rigidity of the belt-shaped member can be. For this reason, it has been difficult to rehabilitate existing pipes, such as large-diameter pipes, which require a strong rehabilitation material. In view of the above circumstances, the present invention aims to provide a belt-shaped rehabilitation member and a method for rehabilitating an existing pipe that can reduce the load on the pipe-making machine during pipe making and ensure the strength of the rehabilitated pipe. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides a belt-shaped rehabilitation member that is wound in a spiral shape along the inner wall of an existing pipe to be rehabilitated and manufactured into a helical rehabilitated pipe, an inner surface belt material made of synthetic resin, the inner surface belt material having an inner peripheral surface of the rehabilitating pipe, and a pair of fitting portions provided at both ends of the inner surface belt material in a belt width direction, the pair of fitting portions being fitted together by being wound in the spiral shape; a hollow band material made of metal, the hollow band material having a generally rectangular and hollow cross-sectional shape with a long side facing the band width direction and a hollow band portion therein that can be filled with a hardenable filler; The present invention is characterized in that the inner surface band portion covers a base portion of the hollow band material that faces the inside of the rehabilitation pipe.

[0006] According to this rehabilitation strip, the load on the pipe making machine during pipe making can be reduced by lowering the rigidity of the hollow strip, and therefore the rigidity of the rehabilitation strip itself. After pipe making, the inside of the hollow strip is filled with a filler material. As the filler material hardens, it mainly provides the compressive strength. The hollow strip mainly provides the tensile strength. This increases the strength of the rehabilitated pipe. Or, the required strength of the rehabilitated pipe is realized. Therefore, it can also be applied to the rehabilitation of existing pipes that require the strength of the rehabilitation material, such as large diameter culverts. The hardening filler includes concrete, mortar, cement milk, and the like.

[0007] Preferably, the hollow band portion before winding is formed into a generally rectangular, hollow cross-sectional shape in which the central portion in the band width direction bulges in the band thickness direction and the central portion in the band thickness direction narrows in the band width direction. In this type of rehabilitation strip, the hollow strip tends to be deformed by the curvature given during pipe making so that the central portion in the strip width direction narrows and the central portion in the strip thickness direction widens. Therefore, by forming the initial cross-sectional shape of the hollow strip so that the central portion in the strip width direction expands and the central portion in the strip thickness direction narrows, the hollow strip can be made to approach a rectangular cross section by deformation during pipe making.

[0008] Preferably, a retaining portion surrounding the hollow band portion is integrally formed on the inner band material. This allows the hollow band material to be reliably held by the inner band material. The retaining portion may surround the hollow band portion in cooperation with the inner band portion. The retaining portion is preferably formed to have a substantially rectangular cross-sectional shape that matches the hollow band portion.

[0009] Preferably, a pair of retaining portions are integrally formed on the inner band material so as to cover both sides of the hollow band portion in the band width direction and retain the hollow band portion, and a portion of the hollow band portion is exposed between the retaining portions. The hollow band can be held by the pair of holding parts. Also, the backfill material filled between the existing pipe and the rehabilitated pipe passes between the pair of holding parts and directly adheres to the exposed part of the hollow band. This allows the existing pipe and the rehabilitated pipe to be integrated through the backfill material to form a composite pipe.

[0010] Preferably, a portion of the hollow band portion opposite the inner peripheral surface from the base plate portion is exposed from the inner band portion, and the base plate portion is formed with a protruding piece portion protruding from the hollow band portion in the band width direction and embedded inside the inner band material. The opposite side corresponds to the outer periphery side of the rehabilitating pipe. As a result, the backfill material filled between the existing pipe and the rehabilitated pipe comes into direct contact with and adheres to the exposed portion of the hollow band, integrating the rehabilitated pipe and the existing pipe through the backfill material, forming a composite pipe. In addition, the hollow band is stably fixed to the inner band by embedding the protruding pieces in the inner band.

[0011] The method of the present invention is a method for rehabilitating an existing pipe using the above-mentioned belt-shaped rehabilitation member, The rehabilitation belt-shaped member is wound in a spiral shape along the inner wall of the existing pipe and the fitting portions are fitted together to produce a helical rehabilitating pipe; Thereafter, the hollow portion of the hollow band material is filled with the filler. According to this method for rehabilitating existing pipes, the hollow band material is made low in rigidity, which makes it easier to manufacture the pipe and reduces the load on the pipe-making machine. After the rehabilitated pipe is manufactured, a filling process is performed to ensure the rigidity of the rehabilitated pipe.

[0012] Preferably, a backfilling material is filled between the inner wall and the rehabilitating pipe. This integrates the existing pipe and the rehabilitated pipe via the backfill material to form a composite pipe. Effect of the Invention

[0013] According to the present invention, the load on the pipe-making machine can be reduced by making the hollow band and thus the rehabilitation band member itself low in rigidity. After pipe making, the strength of the rehabilitated pipe can be secured by filling the hollow band with a filler. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a side cross-sectional view along the pipe axis direction of an existing pipe that has been rehabilitated with a rehabilitation pipe of a self-supporting pipe structure made from a rehabilitation band-shaped member according to a first embodiment of the present invention. [Diagram 2] Fig. 2(a) is a front cross-sectional view of the rehabilitated existing pipe taken along line II-II in Fig. 1. Fig. 2(b) and Fig. 2(c) are front cross-sectional views showing modified examples of the existing pipe after rehabilitating it with a self-supporting pipe structure. [Diagram 3] FIG. 3 is an enlarged cross-sectional view of the circle III in FIG. [Figure 4] FIG. 4 is a cross-sectional view of the rehabilitation belt-shaped member. [Diagram 5] 5(a) to 5(e) are cross-sectional views sequentially showing the steps of filling the hollow portion inside the rehabilitating pipe with a hardenable filler. [Figure 6] FIG. 6 is a side cross-sectional view of the existing pipe in the filling step. [Figure 7] FIG. 7 is a cross-sectional view of a rehabilitation belt-shaped member according to a second embodiment of the present invention. [Figure 8]FIG. 8 is a cross-sectional view of a rehabilitation belt-shaped member according to a third embodiment of the present invention. [Figure 9] Fig. 9(a) is a front cross-sectional view of a composite pipe structure including an existing pipe and a rehabilitated pipe made by the rehabilitation belt-shaped member according to the third embodiment. Fig. 2(b) and Fig. 2(c) are front cross-sectional views showing modified examples of the existing pipe in the composite pipe structure according to the third embodiment. [Figure 10] FIG. 10 is a cross-sectional view taken along line XX in FIG. [Figure 11] FIG. 11 is a cross-sectional view of a rehabilitation belt-shaped member according to a fourth embodiment of the present invention. [Figure 12] FIG. 12 is a side cross-sectional view of a composite pipe structure including an existing pipe and a rehabilitating pipe manufactured using the rehabilitation band-shaped member according to the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 6)> As shown in Fig. 1, the existing pipe 1 to be rehabilitated in this embodiment is an aged sewer pipe buried underground. Note that the existing pipe 1 to be rehabilitated is not limited to a sewer pipe, but may be a water supply pipe, an agricultural water pipe, a hydroelectric power generation water pipe, a gas pipe, or any other existing pipe, or may be a tunnel.

[0016] As shown in Fig. 2(a), the existing pipe 1 is a large-diameter circular pipe with a circular cross section, for example, an inner diameter of more than 2000 mm. Note that the existing pipe is not limited to a circular pipe, and may be a rectangular culvert with a rectangular cross section, as shown in Fig. 2(b), or a horseshoe culvert with a horseshoe-shaped cross section, as shown in Fig. 2(c).

[0017] As shown in Fig. 1, an inner wall 1a of an existing pipe 1 is lined with a rehabilitation pipe 3, thereby rehabilitating the existing pipe 1. The rehabilitation pipe 3 in the first embodiment constitutes a self-supporting pipe that has the required strength as a buried pipe by itself.

[0018] As shown in Fig. 2(a), the rehabilitation pipe 3 is formed with a circular cross section that matches the cross section of the existing pipe 1, which is a circular pipe. Preferably, the rehabilitation pipe 3 is attached around the entire circumference of the inner wall 1a of the existing pipe 1. When the existing pipe 1 is a rectangular culvert, as shown in Fig. 2(b), the rehabilitation pipe 3 is formed with a rectangular cross section that fits along the inner wall of the rectangular culvert. When the existing pipe 1 is a horseshoe culvert, as shown in Fig. 2(c), the rehabilitation pipe 3 is formed with a horseshoe cross section that fits along the inner wall of the horseshoe culvert.

[0019] As shown in Fig. 3, the rehabilitation pipe 3 includes a rehabilitation strip 10 and a hardening filler 5. The rehabilitation strip 10 is wound spirally around the inner wall 1a of the existing pipe 1 to produce the rehabilitation pipe 3 in a spiral shape.

[0020] As shown in Fig. 4, the rehabilitation belt-shaped member 10 has an inner belt material 11 and a hollow belt material 20, is formed to a constant cross-sectional shape, and extends in the belt length direction (the direction perpendicular to the paper surface in Fig. 4). The material of the inner belt material 11 is a synthetic resin such as polyvinyl chloride.

[0021] As shown in Fig. 4, the inner surface band material 11 includes a flat band-shaped inner surface band portion 12, a pair of fitting portions 13, 14, and a retaining portion 15. As shown in Fig. 3, the inner surface band portion 12 forms the inner circumferential surface 3a of the rehabilitating pipe 3.

[0022] As shown in Fig. 4, fitting portions 13, 14 are provided at both ends in the band width direction (left-right direction in Fig. 4) of the inner surface band portion 12. The first fitting portion 13 at one end in the band width direction (left end in Fig. 4) protrudes from the inner surface band portion 12 to one end side in the band width direction (left side in Fig. 4) and protrudes to the outer periphery (the side corresponding to the outer side in the pipe diameter direction of the rehabilitating pipe 3, the upper side in Fig. 4). The top end surface 13b (upper surface in Fig. 4) of the first fitting portion 13 constitutes the outer periphery of the rehabilitating pipe 3 (Fig. 3).

[0023] A fitting groove 13a that opens to the inner periphery side (the lower side in FIG. 4) is formed in the first fitting portion 13. A seal material 16 is accommodated in the groove bottom on the opposite side to the opening of the fitting groove 13a.

[0024] The second fitting portion 14 at the other end (the right end in FIG. 4) in the band width direction of the inner band portion 12 is formed in a convex stripe shape and protrudes from the inner band portion 12 to the outer periphery side (upper side in FIG. 4).

[0025] As shown in FIG. 3, in the rehabilitating pipe 3, the second fitting portion 14 of the helically wound rehabilitating belt-shaped member 10 fits into the fitting groove 13a, thereby causing the fitting portions 13, 14 to fit together in a recessed and projecting manner.

[0026] As shown in Fig. 4, a retaining portion 15 is integrally formed with the inner surface band material 11. The retaining portion 15 is provided on the outer circumferential side of the inner surface band portion 12 (upper side in Fig. 4). The cross section of the retaining portion 15 is formed in a rectangular (approximately rectangular) shape with the inner surface band portion 12 as the bottom. The long sides of the rectangular cross section of the retaining portion 15 are oriented in the band width direction (left and right in Fig. 4), and the short sides are oriented in the band thickness direction (up and down in Fig. 4). The top surface 15b of the retaining portion 15 is flush with the top end surface 13b of the first fitting portion 13, and together with the top end surface 13b, constitute the outer circumferential surface of the rehabilitation pipe 3 (Fig. 3).

[0027] As shown in Fig. 4, hollow band 20 made of a metal such as steel is incorporated into inner band 11. Hollow band 20 includes a pair of long side plate portions 21, 22 and a pair of short side plate portions 23, 24. These four plate portions 21-24 form hollow band 25 having a rectangular (approximately rectangular) hollow cross-sectional shape. The long sides of the rectangular cross section of hollow band 25 are oriented in the band width direction (left and right in Fig. 4), and the short sides are oriented in the band thickness direction (up and down in Fig. 4).

[0028] The plate portions 21 to 24 are made of metal plates such as steel plates. 20 is preferably t 20 = about 0.8 mm to 3.2 mm. At the corners of the hollow band portion 25, the intersecting plate portions 21 to 24 are joined together by welding or the like. Note that the intersecting plate portions 21 to 24 may be integrally connected to each other.

[0029] As shown in FIG. 4, the width dimension W of the hollow band portion 25 is preferably25 is the effective width W of the belt-shaped member 10 for rehabilitation 10 The following formula is satisfied for (the width between the fitting portions 13 and 14). W 10 ×0.7≦W 25 ≦W 10 ×0.9 (1) Height dimension H of hollow belt section 25 25 and width dimension W 25 Preferably, the following formula is satisfied: W 25 ×0.2≦H 25 ≦W 25 ×0.5 (2)

[0030] The hollow band portion 25 is surrounded and held by the holding portion 15 and the inner band portion 12. The outer surfaces of the plate portions 22, 23, 24 of the hollow band portion 25 are in close contact with the holding portion 15. The base portion 21 of the hollow band material 20 facing the inside of the rehabilitating pipe (the lower side in FIG. 4 ) is in close contact with the inner band portion 12. The inner surface band material 11 functions as a covering material or corrosion prevention material that covers at least the side portion of the hollow band material 20 that faces the inside of the rehabilitating pipe.

[0031] As shown in FIG. 4, a hollow portion 26 having a rectangular (substantially rectangular) cross section is defined inside the hollow band portion 25. The hollow portion 26 can be filled with the filler 5. The hollow portion 26 extends over the entire length of the belt-shaped rehabilitation member 10. The width and height of the hollow portion 26 are respectively equal to the width W of the hollow band portion 25. 25 and height dimension H 25 and satisfies formula 1 and formula 2.

[0032] As shown in FIG. 3, in the rehabilitating pipe 3, a hardening filler 5 is filled in the hollow portion 26. The filler 5 is mortar, but is not limited to this and may be concrete or cement milk. The required strength of the rehabilitating pipe 3 is achieved by the hardening of the filler 5. In other words, an unfilled rehabilitating pipe 3' (FIG. 5(a)) consisting only of a rehabilitation strip member 10 does not have to satisfy the required strength. In other words, the hollow strip material 20 has such low rigidity that the unfilled rehabilitating pipe 3' does not satisfy the required strength.

[0033] When manufacturing the belt-shaped rehabilitation member 10, the four plate portions 21 to 24 are each unwound from a roll, combined to form a rectangular cross section, and the four corners are welded to form the hollow belt material 20. The hollow strip 20 thus prepared is introduced into an extrusion molding machine, which then co-extrudes the inner strip 11 around the hollow strip 20. At this time, the synthetic resin material of the inner strip 11 is brought into close contact with the outer surface of the hollow strip 20. This causes the inner strip 11 and the hollow strip 20 to be joined together as one body.

[0034] As shown in Fig. 5(a), when rehabilitating an existing pipe 1, a pipe-making machine winds the rehabilitation strip 10 in a spiral shape along the inner wall 1a of the existing pipe 1 and engages the fitting portions 13, 14. This produces a spiral unfilled rehabilitated pipe 3'. Since the rehabilitation strip 10 itself, including the hollow strip 20, has low rigidity, the load on the pipe-making machine during pipe manufacturing can be reduced. Preferably, pipe manufacturing is performed so that the rehabilitating pipe 3' is attached to the entire circumference of the inner wall 1a of the existing pipe 1. The hollow band material 20 extends helically over the entire area in the axial direction of the rehabilitating pipe 3'. The hollow portion 26 forms a single helical space over the entire area in the axial direction of the rehabilitating pipe 3'.

[0035] After pipe manufacturing, the hollow portion 26 of the rehabilitated pipe 3' is filled with a filler 5 for imparting the required strength. More specifically, as shown in FIG. 5(b), a cylindrical injection port member 52 is attached to the inner peripheral surface 3a of the unfilled rehabilitating pipe 3' by butt welding or the like. Next, as shown in FIG. 5(c), the inner surface band portion 12 and the substrate portion 21 facing the inside of the injection port member 52 are drilled with a drilling jig such as a hole saw (not shown) to form an injection port 54, and the hollow portion 26 is connected to the inside of the injection port member 52 via the injection port 54. Next, as shown in FIG. 5( d ), the injection pipe 51 is connected to the injection port member 52 via a joint 53 . Then, as shown in FIG. 5(e), the filler 5 discharged from the injection pump 50 is injected into the hollow portion 26 through the injection pipe 51.

[0036] Preferably, as shown in Fig. 6, injection pipes 51 are connected to multiple locations spaced apart in the axial direction of the rehabilitating pipe 3, and injection is performed for each injection zone R before and after the connection position. Since the rehabilitating pipe 3 has only one hollow section 26, only one connection section for the injection pipe 51 needs to be provided per injection zone R. This allows the injection pipe connection work to be performed efficiently. The openings of the hollow section 26 at both ends in the axial direction of the rehabilitating pipe 3 are sealed with the sealant 6. This allows the filling material 5 to be filled into the hollow section 26 throughout the entire axial direction of the rehabilitating pipe 3. The hollow portion 26 has a rectangular cross section (approximately rectangular cross section) that satisfies the formulas 1 and 2. For example, the inner diameter is 25 In comparison with injecting the filler 5 into a circular pipe of a similar size, the injection resistance can be made sufficiently small, and the filler 5 can be evenly filled into the hollow portion 26 over the entire axial direction of the rehabilitating pipe 3. Furthermore, the hollow band portion 25 is expanded in diameter by filling with the filler 5, and is tightly attached to the existing pipe 1. Therefore, the adhesion between the existing pipe 1 and the rehabilitating pipe 3 is improved. Eventually, the filling material 5 in the hollow portion 26 hardens.

[0037] 3, after the filling material 5 has hardened, the injection tube 51 and the injection port member 52 (FIG. 5(e)) are removed, and the injection port 54 is closed with a cap 55. The material of the cap 55 is preferably a resin such as polyvinyl chloride.

[0038] If the existing pipe 1 is a rectangular culvert (Fig. 2(b)) or a horseshoe culvert (Fig. 2(c)), it is preferable to hold down the part of the rehabilitated pipe that corresponds to the corner 1c of the rectangular culvert or horseshoe culvert with shoring and align it to the corner when injecting the filler 5. As the filler 5 hardens, the rehabilitated pipe 3 maintains its shape along the corner 1c.

[0039] The filling material 5 filled in the hollow portion 26 mainly provides compressive strength as it hardens. The hollow band material 20 mainly provides tensile strength. This allows the rehabilitation pipe 3 to achieve the required strength as a self-supporting pipe. In this way, the deteriorated existing pipe 1 can be rehabilitated. Even if the existing pipe 1 has a large diameter, a rehabilitation pipe 3 with the required strength can be constructed, and the existing pipe 1 can be reliably rehabilitated. By having the inner surface strip 11 surround the hollow strip 20, corrosion of the hollow strip 20 can be prevented.

[0040] Next, another embodiment of the present invention will be described. In the following embodiment, the same components as those in the above-described embodiment will be denoted by the same reference numerals in the drawings and the description thereof will be omitted. <Second embodiment (FIG. 7)> As shown in Figure 7, in the rehabilitation strip member 10B of the second embodiment of the present invention, the initial cross-sectional shape of the hollow strip portion 25, i.e., the cross-sectional shape before being wound spirally, is formed into an approximately rectangular shape in which the central portion in the strip width direction (left-right direction in Figure 7) bulges in the strip thickness direction (up-down direction in Figure 7) and the central portion in the strip thickness direction narrows in the strip width direction.

[0041] Specifically, the pair of long-side side plate portions 21, 22 are curved so that their central portions are farther apart from each other than their ends. The pair of short-side side plate portions 23, 24 are curved so that their central portions are closer to each other than their ends. Accordingly, the central portion of the inner strip material 11 in the strip width direction bulges in the strip thickness direction, and the central portion in the strip thickness direction narrows in the strip width direction.

[0042] During the rehabilitation of an existing pipe 1, the rehabilitation strip 10B and thus the hollow strip 25 are spirally wound to impart curvature. As a result, the hollow strip 25 is deformed so that the central portion in the strip width direction is narrowed and the central portion in the strip thickness direction is widened. This allows the hollow strip 25 to have a cross section closer to a rectangle. Also, the retaining portion 15 can have a cross section closer to a rectangle. This allows the rehabilitation strip 10B after pipe manufacturing to have the cross section as designed.

[0043] <Third embodiment (FIGS. 8 to 10)> As shown in Fig. 8, in a rehabilitation strip 10C according to a third embodiment of the present invention, a pair of retaining portions 17 are integrally provided on the inner strip 11. Each retaining portion 17 is formed to have an L-shaped cross section. These retaining portions 17 retain the hollow strip 25 by covering both sides in the strip width direction (left and right in Fig. 8). In detail, each retaining portion 17 covers the outer surface of the corresponding short side side plate portion 23, 24, and wraps around a corner portion 29 formed by the long side side plate portion 22 and each end face side plate portion 23, 24 to cover both ends of the long side side plate portion 22.

[0044] A part of the hollow band 25 (specifically, the central portion 22c in the band width direction of the long side plate portion 22) is exposed between the pair of retaining portions 17. The pair of retaining portions 17 are engaged with the hollow band material 20 from both sides in the band width direction (left and right in FIG. 8), thereby preventing the hollow band material 20 from being separated from the inner band material 11.

[0045] As shown in Fig. 9(a), the existing pipe 1 in the third embodiment is a large-diameter circular pipe, but is not limited thereto and may be a rectangular culvert as shown in Fig. 9(b) or a horseshoe culvert as shown in Fig. 9(c). The rehabilitation pipe 3 made of the rehabilitation strip member 10C is manufactured to have a diameter slightly smaller than the inner diameter of the existing pipe 1. Between the inner wall 1a of the existing pipe 1 and the rehabilitation pipe 3, a pipe gap 2 is formed.

[0046] As shown in Figure 10, the gap 2 between the pipes is filled with a backfilling material 4 such as mortar. The existing pipe 1 and the rehabilitating pipe 3 are integrated through the backfilling material 4 to form a composite pipe. In a composite pipe, the remaining strength of the existing pipe 1 is utilized in addition to the strength of the rehabilitating pipe 3. Conversely, the required strength of the rehabilitating pipe 3 can be lowered than in the case of a freestanding pipe. Therefore, the hollow band portion 25 can be made less rigid, and the load on the pipe manufacturing machine during pipe manufacturing can be further reduced.

[0047] As shown in Figure 10, a portion of the backfilling material 4 enters between a pair of retaining portions 17 and contacts the exposed portion 22c of the hollow band portion 25. Therefore, the backfilling material 4 and the hollow band material 20 are directly attached to each other. This increases the adhesive strength between the backfilling material 4 and the rehabilitating pipe 3, and makes it possible to suppress slippage at the interface between the backfilling material 4 and the rehabilitating pipe 3. As a result, the existing pipe 1 and the rehabilitating pipe 3 can be reliably integrated via the backfilling material 4.

[0048] Preferably, the backfilling step of the backfilling material 4 is carried out before the filling material 5 is filled into the hollow portion 26. As the filling material 5 hardens, the rehabilitating pipe 3 develops the required strength.

[0049] <Fourth embodiment (FIGS. 11 and 12)> As shown in Figure 11, in the rehabilitation strip member 10D of the fourth embodiment of the present invention, the middle portion 12a in the strip width direction (left and right in Figure 11) of the inner surface strip portion 12 is formed to be thinner than both end portions 12e, 12f in the strip width direction of the inner surface strip portion 12, and a step 12d is formed between each end portion 12e, 12f and the middle portion 12a.

[0050] The hollow band portion 25 of the hollow band material 20 is disposed on the outer circumferential side of the inner band material 11 (the side facing the inner wall 1a of the existing pipe, the upper side in FIG. 11). The plate portions 22, 23, and 24 of the hollow band material 20, excluding the base portion 21, are exposed on the outer circumferential side of the inner band material 11 (the upper side in FIG. 11). The surface of the base portion 21 facing the inside of the rehabilitated pipe (the lower side in FIG. 11) is covered with the thin-walled middle portion 12a of the inner band portion 12.

[0051] Both ends of the base plate portion 21 in the band width direction protrude outward in the band width direction beyond the hollow band portion 25 to form a pair of protruding pieces 27, 28. The protruding pieces 27, 28 are embedded inside the inner band material 11 by biting into end portions 12e, 12f from step 12d of the inner band portion 12. The tip side portion of the protruding piece 27 on one end side (left side in FIG. 11) is bent obliquely toward the outer periphery side (upper side in FIG. 11) and enters the inside of the first fitting portion 13. The protruding piece 28 on the other end side (right side in FIG. 11) extends straight up to near the base of the second fitting portion 14.

[0052] In manufacturing the belt-shaped rehabilitation member 10D, the base plate 21 is formed independently by roll forming a metal plate such as steel, and the plate portions 22, 23, 24 are formed into an integral U-shaped cross section by roll forming another metal plate such as steel. The short side plate portions 23, 24 of the U-shaped cross section are butted against the formed base plate portion 21 and welded. In this way, the hollow belt material 20 is produced.

[0053] The hollow band 20 thus produced is introduced into an extrusion molding machine, and the inner band 11 is co-extruded by the extrusion molding machine so as to be integrated with the hollow band 20. In this way, a rehabilitation band-shaped member 10D is produced. By co-extrusion molding, the base portion 21 and the inner band portion 12 are closely attached to each other and integrated, and the protruding pieces 27, 28 are embedded in the inner band 11, so that the hollow band 20 can be stably fixed to the inner band 11. Therefore, separation of the hollow band 20 from the inner band 11 can be prevented.

[0054] According to the rehabilitating belt-shaped member 10D, the cross-sectional area of ​​the inner belt material 11 is smaller than that of the rehabilitating belt-shaped members 10, 10B, and 10C of the first to third embodiments (FIGS. 4, 7, and 8). Therefore, the amount of raw resin material required for the inner belt material 11 per unit belt length can be reduced.

[0055] As shown in Fig. 12, a rehabilitating pipe 3 made of a rehabilitation strip member 10D is suitable for a composite pipe structure in which it is integrated with an existing pipe 1 via a backfilling material 4. The backfilling material 4 filled in the pipe gap 2 is attached in direct contact with the exposed parts of the hollow strip portion 25, i.e., the plate portions 22, 23, and 24. This reliably prevents slippage between the hollow strip material 20 of the rehabilitating pipe 3 and the backfilling material 4, and reliably integrates the existing pipe 1 and the rehabilitating pipe 3 via the backfilling material 4. The hollow strip material 20 mainly provides tensile strength, and the backfilling material 4 and the filling material 5 mainly provide compressive strength, thereby reliably ensuring the required strength as a composite pipe. Furthermore, since the hollow band portion 25 is expanded in diameter by filling with the filling material 5, the rehabilitating pipe 3 is tightly attached to the existing pipe 1 via the backfilling material 4. Therefore, the adhesion between the existing pipe 1 and the rehabilitating pipe 3 can be improved.

[0056] The surface of the base plate portion 21 facing the inside of the rehabilitating pipe is covered with the inner surface band material 11, thereby preventing corrosion of the hollow band material 20. In other words, the role of the inner surface band material 11 in the rehabilitation strip member 10D is specialized to fitting during pipe manufacturing and covering / anti-corrosion functions. Since the required strength of the rehabilitating pipe 3 is provided by the hollow band material 20 and the filler material 5, the inner surface band material 11 does not need to provide that strength. Therefore, the inner surface band portion 12 can be made thinner, and the required amount of raw resin for the inner surface band material 11 can be reliably reduced. This allows the material costs to be reduced.

[0057] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the cross-sectional shape of the existing pipe to be rehabilitated in the present invention is not limited to a circular, rectangular, or horseshoe shape, but may be an oval or other cross-sectional shape. The present invention is not limited to existing large-diameter pipes, but may also be applied to existing small-diameter pipes. In the third embodiment (FIG. 8) and the fourth embodiment (FIG. 11), the initial cross-sectional shape of the hollow band portion 25 may be formed to be the same as that of the second embodiment (FIG. 7). The rehabilitation pipe 3 of the first embodiment (FIG. 4) may be applied to a composite pipe structure. The rehabilitation pipe 3 of the third embodiment (FIG. 8) and the fourth embodiment (FIG. 11) may be applied to a free-standing pipe structure. [Explanation of symbols]

[0058] 1 Existing pipes 1a Inner wall 1c Corner 2. Pipe clearance 3 Rehabilitation pipe 3' Unfilled rehabilitation pipe 3a Inner surface 4 Backfill material 5 Curable filler 6. Encapsulating materials 10 Rehabilitation belt-shaped member 10B, 10C, 10D Rehabilitation strips 11 Inner surface strip 12 Inner belt 12a middle part 12d Step 12e,12f end part 13 Fitting part 13a Fitting groove 13b Top surface 14 Fitting part 15 Holding part 15b Top 16 Sealing material 17 Holding part 20 Hollow strip material 21 Circuit Board 22 Top long side plate 22c Exposed Part 23,24 Short side plate 25 Hollow belt 26 Hollow part 27,28 Projection piece 29 Corner section 51 Injection tube 52 Inlet material 53 Joint 54 Inlet 55 Cap

Claims

1. A belt-shaped rehabilitation member that is wound in a spiral shape along the inner wall of an existing pipe to be rehabilitated to produce a helical rehabilitated pipe, an inner surface belt material made of synthetic resin, the inner surface belt material having an inner peripheral surface of the rehabilitating pipe, and a pair of fitting portions provided at both ends of the inner surface belt material in a belt width direction, the pair of fitting portions being fitted together by being wound in the spiral shape; a hollow band material made of metal, the hollow band material having a generally rectangular and hollow cross-sectional shape with a long side facing the band width direction and a hollow band portion therein that can be filled with a hardenable filler; wherein the inner surface belt portion covers a base portion of the hollow belt material that faces the inside of the rehabilitation pipe.

2. A rehabilitation belt-shaped member as described in claim 1, wherein the hollow belt portion before winding is formed into an approximately rectangular and hollow cross-sectional shape in which the central portion in the belt width direction bulges in the belt thickness direction and the central portion in the belt thickness direction narrows in the belt width direction.

3. 2. The rehabilitating belt-shaped member according to claim 1, wherein the inner belt material has a retaining portion integrally formed therewith, the retaining portion surrounding the hollow belt portion.

4. A rehabilitation belt-shaped member as described in claim 1, wherein a pair of retaining portions are integrally formed on the inner belt material and cover both sides of the hollow belt portion in the belt width direction to hold the hollow belt portion, and a portion of the hollow belt portion is exposed between the retaining portions.

5. a portion of the hollow band portion opposite the inner peripheral surface from the substrate portion is exposed from the inner peripheral surface band portion, 2. The rehabilitating belt-shaped member according to claim 1, wherein the base plate portion is formed with a protruding piece portion that protrudes from the hollow belt portion in the belt width direction and is embedded inside the inner belt material.

6. A method for rehabilitating an existing pipe using the belt-shaped rehabilitation member according to any one of claims 1 to 5, The rehabilitation belt-shaped member is wound in a spiral shape along the inner wall of the existing pipe and the fitting portions are fitted together to produce a helical rehabilitating pipe; The method for rehabilitating an existing pipe is characterized in that the hollow band portion is then filled with the filler material.

7. The method for rehabilitating an existing pipe according to claim 6, further comprising filling a backfilling material between the inner wall and the rehabilitating pipe.

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