Rehabilitation piping structure and rehabilitation method

Abstract

To provide a regeneration pipe structure capable of regenerating a piping structure while maintaining elasticity of the piping structure.SOLUTION: A regeneration piping structure 1 comprises: a piping structure 10 provided with an expansion joint 13; a regeneration pipe 41 arranged in the piping structure 10; an outer layer member 42 provided at a portion corresponding to the expansion joint 13 in an axial line O direction of the piping structure 10 on the outer peripheral surface of the regeneration pipe 41, and having an outer diameter larger than that of the regeneration pipe 41; and a filling material 65 arranged between the piping structure 10, and the regeneration pipe 41 and the outer layer member 42.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rehabilitating piping structure and a rehabilitating method. [Background technology]

[0002] Conventionally, penstocks used in hydroelectric power plants have been constructed as follows (see, for example, Patent Document 1). That is, the pipes are manufactured in a factory. The pipes are transported to the installation position at the site, which is generally on an inclined surface. The pipes are joined by welding their circumferential joints to form the penstock. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 60-037318 Summary of the Invention [Problem to be solved by the invention]

[0004] In some penstocks (piping structures), expansion joints are installed to deal with expansion and contraction caused by factors such as the outside temperature. Expansion joints allow the multiple steel pipes that make up the penstock to move axially relative to one another. This allows the penstock to expand and contract axially. Furthermore, after a certain period of use, the penstock will need to be rehabilitated. In this case, it is desirable to rehabilitate the penstock while maintaining its flexibility.

[0005] The present invention has been made in consideration of such problems, and has an object to provide a rehabilitated piping structure and a rehabilitation method that can rehabilitate a piping structure while maintaining the flexibility of the piping structure. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The rehabilitated piping structure of the present invention is characterized by comprising a piping structure provided with an expansion joint, a rehabilitated pipe arranged within the piping structure, an outer layer member provided on the outer peripheral surface of the rehabilitated pipe at a portion corresponding to the expansion joint in the axial direction of the piping structure and having an outer diameter larger than that of the rehabilitated pipe, and a filler material arranged between the piping structure, the rehabilitated pipe, and the outer layer member. Furthermore, the rehabilitation method of the present invention is a method for rehabilitating a piping structure provided with an expansion joint, characterized in that a rehabilitation pipe is placed within the piping structure, an outer layer member having an outer diameter larger than that of the rehabilitation pipe is provided on the outer peripheral surface of the rehabilitation pipe at a portion corresponding to the expansion joint in the axial direction of the piping structure, and a filler material is placed between the piping structure and the rehabilitation pipe and the outer layer member.

[0007] According to these inventions, fluids such as water that previously flowed through the piping structure flow through a rehabilitation pipe that is provided in the piping structure via a filler. Therefore, the piping structure can be rehabilitated by the filler and the rehabilitation pipe. Furthermore, the length (thickness) in the radial direction of the rehabilitated pipe of the filler disposed between the piping structure and the rehabilitated pipe and outer layer member is shorter (rehabilitated to be shorter) in the portion where the outer layer member is provided than in the portion where the outer layer member is not provided. Therefore, in the axial direction, the filler in the portion where the outer layer member is provided can be more easily broken than the filler in the portion where the outer layer member is not provided. An expansion joint is disposed radially outside the portion where the outer layer member is provided. Because the expansion joint is connected to the radial outside of the easily breakable filler, the stretchability of the piping structure can be maintained even when the piping structure expands and contracts in the axial direction due to the expansion joint.

[0008] In the rehabilitating pipe structure, the outer layer member may be formed of a foam. According to this invention, by forming the outer layer member from a foam having a relatively light mass, the outer layer member can be easily transported and applied.

[0009] In the rehabilitating piping structure, the outer layer member may have a plurality of divided pieces arranged side by side in the circumferential direction of the piping structure. According to this invention, since the outer layer member is divided into a plurality of divided pieces, the divided pieces separated from the outer layer member can be easily transported and installed. In addition, the orientation of adjacent divided pieces in the circumferential direction can be easily adjusted, and the plurality of divided pieces can be arranged along the outer circumferential surface of the rehabilitation pipe.

[0010] In the rehabilitating piping structure, the outer layer member may include a connecting member that connects the plurality of divided pieces to each other. According to this invention, since the plurality of divided pieces are connected together by the connecting member, the plurality of divided pieces become easier to handle.

[0011] In addition, in the rehabilitation piping structure, the rehabilitation pipe may include a first rehabilitation pipe, a second rehabilitation pipe arranged offset in the axial direction relative to the first rehabilitation pipe, and a receiving port which is the outer layer member provided on the outer peripheral surface of the end of the second rehabilitation pipe and into which the end of the first rehabilitation pipe is arranged. According to this invention, the end of the first rehabilitating pipe moves in the axial direction within the receiving port, thereby allowing the first rehabilitating pipe and the second rehabilitating pipe to expand and contract in the axial direction as a whole. Furthermore, because the outer layer member is a socket, even if the first rehabilitating pipe and the second rehabilitating pipe do not have a member other than the socket, the socket can be used as the outer layer member.

[0012] In the rehabilitating piping structure, a distance between the outer layer member and the piping structure in a radial direction of the piping structure may be 20 mm or more and 50 mm or less. According to the present invention, the rehabilitation pipe can be easily arranged. Effect of the Invention

[0013] According to the rehabilitated piping structure and the rehabilitation method of the present invention, the piping structure can be rehabilitated while maintaining the flexibility of the piping structure. [Brief description of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view of a rehabilitating pipe structure according to a first embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along line A1-A1 in FIG. [Diagram 3] FIG. 11 is a perspective view showing a state in which an outer layer member of a rehabilitating piping structure in a first modified example of the embodiment of the present invention is developed. [Figure 4] FIG. 11 is a diagram showing a shape of a split piece in a second modified example of the embodiment of the present invention, as viewed in the axial direction. [Diagram 5] FIG. 13 is a diagram showing a shape of a split piece in a third modified example of the embodiment of the present invention, as viewed in the axial direction. [Figure 6] FIG. 4 is a cross-sectional view of a rehabilitating pipe structure according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] (First embodiment) Hereinafter, a first embodiment of a rehabilitating piping structure and a rehabilitating method according to the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 and 2, the rehabilitating piping structure 1 includes a piping structure 10, a rehabilitating pipe structure 40, and a filler 65. The rehabilitating piping structure 1 is a structure in which the piping structure 10 is rehabilitated by the rehabilitating pipe structure 40 and the filler 65. For example, the piping structure 10 is used to carry water for a hydroelectric power plant. Although not shown, the piping structure 10 is disposed on an inclined surface formed on a mountain or the like.

[0016] Here, the piping structure 10, the rehabilitating pipe structure 40, and the filler 65 are formed in a cylindrical shape. The central axes (axial lines) of the piping structure 10, the rehabilitating pipe structure 40, and the filler 65 are arranged coaxially with the common axis. Hereinafter, the common axis is referred to as the axis O. The direction along the axis O is referred to as the axis O direction. Within the axis O direction, the direction in which water flows within the piping structure 10 is referred to as the downstream side D1, and the side opposite to the downstream side D1 is referred to as the upstream side D2. When viewing the rehabilitating piping structure 1 from the axis O direction, the direction perpendicular to the axis O is referred to as the radial direction, and the direction going around the axis O is referred to as the circumferential direction.

[0017] The configuration of the piping structure 10 is not particularly limited as long as an expansion joint 13 is provided in the middle part in the direction of the axis O. For example, the piping structure 10 has a first steel pipe 11, a second steel pipe 12, and the expansion joint 13. The first steel pipe 11 and the second steel pipe 12 are formed into a tubular shape from steel material. The inner diameter of the first steel pipe 11 is equal to the inner diameter of the second steel pipe 12, and the outer diameter of the first steel pipe 11 is equal to the outer diameter of the second steel pipe 12. For example, the inner diameter of the steel pipes 11 and 12 is 1200 mm. The second steel pipe 12 is disposed with a position shifted from the first steel pipe 11 in the direction of the axis O. In this embodiment, the second steel pipe 12 is disposed on the downstream side D1 of the first steel pipe 11. A gap S1 is formed between the first steel pipe 11 and the second steel pipe 12 in the direction of the axis O.

[0018] The expansion joint 13 has a first extension member 16, a second extension member 17, and a connecting member 18. The first extension member 16 extends the first steel pipe 11 radially outward and toward the downstream side D1. The second extension member 17 extends the second steel pipe 12 radially outward. The first extension member 16 has a main body 21 and a flange 22. The main body 21 is cylindrical. The main body 21 covers the outer peripheral surface of the end of the first steel pipe 11 on the downstream side D1 and is arranged coaxially with the first steel pipe 11. The main body 21 protrudes downstream side D1 beyond the first steel pipe 11. For example, the main body 21 is joined to the first steel pipe 11 via a spacer 23 by welding or the like. The flange 22 protrudes radially outward from the end of the main body 21 on the downstream side D1. The flange 22 is formed around the entire circumference of the main body 21. The flange 22 is formed with a through hole 22a penetrating in the axial direction O. A plurality of through holes 22a are formed at intervals from each other in the circumferential direction.

[0019] For example, the second extension member 17 has a main body 26, a flange 27, a sealing member 28, and a holding member 29. The main body 26, the sealing member 28, and the holding member 29 are each cylindrical. The main body 26, the sealing member 28, and the holding member 29 cover the outer circumferential surface of the end of the upstream side D2 of the second steel pipe 12. The main body 26, the sealing member 28, and the holding member 29 are arranged in this order from the downstream side D1 toward the upstream side D2. The main body 26 and the holding member 29 are joined to the second steel pipe 12 by welding or the like. The main body 26 and the holding member 29 sandwich the sealing member 28 in the axial direction O. The sealing member 28 is formed of a synthetic resin or the like. The sealing member 28 provides a watertight seal between the main body 21 and the sealing member 28.

[0020] The main body 21 of the first extension member 16 covers the outer circumferential surfaces of the main body 26, the sealing member 28, and the holding member 29 from the radially outside. The main body 21 is movable in the direction of the axis O relative to the main body 26, the sealing member 28, and the holding member 29. The flange 27 protrudes radially outward from an end of the main body 26 on the downstream side D1. The flange 27 is formed around the entire circumference of the main body 26. The flange 27 is formed with through holes 27a penetrating in the axial direction O. A plurality of through holes 27a are formed at intervals from each other in the circumferential direction. The flange 27 is spaced from the main body 21 of the first extension member 16 to the downstream side D1. A gap S2 is formed between the flange 27 and the main body 21 in the axial direction O. Each through hole 27a is formed to face the through hole 22a of the first extension member 16 in the axial direction O.

[0021] The connecting member 18 connects the first extension member 16 and the second extension member 17. The connecting member 18 has a bolt 32 and a nut 33. For example, a male thread is formed over the entire length of the shaft portion (reference number omitted) of the bolt 32. The shaft portion is disposed in the through hole 27a of the second extension member 17 and the through hole 22a of the first extension member 16, respectively. A head (reference number omitted) of the bolt 32 is fixed to a first end of the shaft portion. The diameter of the head is larger than the diameter of the through hole 27a of the second extension member 17. The head contacts the opening peripheral portion of the through hole 27a in the flange 27 of the second extension member 17 from the downstream side D1 of the flange 27. The nut 33 has a female thread formed thereon that fits onto the male thread of the shaft portion of the bolt 32. The nut 33 comes into contact with the opening peripheral portion of the through hole 22a in the flange 22 of the first extension member 16 from the upstream side D2 of the flange 22. The bolt 32 and the nut 33 sandwich the flange 22 of the first extension member 16 and the flange 27 of the second extension member 17 in the axis O direction.

[0022] In the piping structure 10 configured as above, the first steel pipe 11 and the second steel pipe 12 can move relatively in the direction of the axis O until the body 21 of the first extension member 16 comes into contact with the flange 27 of the second extension member 17. The expansion joint 13 connects the first steel pipe 11 and the second steel pipe 12 watertightly and relatively movable in the direction of the axis O.

[0023] The rehabilitation pipe structure 40 is disposed within the piping structure 10. The rehabilitation pipe structure 40 includes a rehabilitation pipe 41 and an outer layer member 42. The rehabilitation pipe 41 is disposed within the piping structure 10. The rehabilitation pipe 41 has a first rehabilitation pipe (first rehabilitation pipe) 45 and a second rehabilitation pipe . For example, the first rehabilitation pipe 45 is made of FRP (Fiber Reinforced Plastics) or FRPM (Fiberglass Reinforced Plastic Mortar). As the first rehabilitation pipe 45 made of FRPM, Eslon RCP (registered trademark, manufactured by Sekisui Chemical Co., Ltd.) can be preferably used.

[0024] The second rehabilitation pipe 46 has a second rehabilitation pipe 49 and a receiving port 50. The second rehabilitation pipe 49 is configured similarly to the first rehabilitation pipe 45. The inner diameter of the second rehabilitation pipe 49 is equal to the inner diameter of the first rehabilitation pipe 45, and the outer diameter of the second rehabilitation pipe 49 is equal to the outer diameter of the first rehabilitation pipe 45. For example, the outer diameters of the first rehabilitation pipe 45 and the second rehabilitation pipe 49 are 1040 mm. The second rehabilitation pipe 49 is disposed at a position shifted in the axial direction O with respect to the first rehabilitation pipe 45. In this embodiment, the second rehabilitation pipe 49 is disposed on the downstream side D1 of the first rehabilitation pipe 45. A gap S4 is formed between the first rehabilitation pipe 45 and the second rehabilitation pipe 49 in the axial direction O.

[0025] The receiving port 50 has a main body 51, a first protruding portion 52, and a second protruding portion 53. The main body 51 is cylindrical. The main body 51 covers the outer peripheral surface of the second rehabilitating pipe 49 and is disposed coaxially with the second rehabilitating pipe 49. The main body 51 protrudes upstream D2 beyond the second rehabilitating pipe 49. The first protrusion 52 protrudes radially inward from the end of the main body 51 on the downstream side D1. The first protrusion 52 is formed around the entire circumference of the main body 51. The second protrusion 53 protrudes radially inward from the end of the main body 51 on the upstream side D2. The second protrusion 53 is formed around the entire circumference of the main body 51. The receiving port 50 is formed of the same material as the first rehabilitation pipe 45. A sealing member 54 is disposed on the inner circumferential surface of the main body 51 on the upstream side D2. The receiving port 50 is fixed to the second rehabilitating pipe 49 by a cylindrical fixing member 55. The fixing member 55 is disposed between the second rehabilitating pipe 49 and a body 51 of the receiving port 50. The receiving port 50 is provided on the outer peripheral surface of the end portion of the second rehabilitating pipe 49 on the upstream side D2. The end of the downstream side D1 of the first rehabilitation pipe 45 is disposed within the main body 51 and the second protruding portion 53 of the receiving port 50. The sealing member 54 watertightly seals between the main body 51 of the receiving port 50 and the first rehabilitation pipe 45. The first rehabilitation pipe 45 is movable relative to the receiving port 50 in the direction of the axis O.

[0026] As shown in FIG. 1 and FIG. 2, the outer layer member 42 is cylindrical. The outer layer member 42 is provided on the outer peripheral surface of the rehabilitating pipe 41 (second rehabilitating pipe 46) at a portion corresponding to the expansion joint 13 in the axial direction O (a portion located radially inside the expansion joint 13). More specifically, the outer layer member 42 is provided on the outer peripheral surface of the second rehabilitating pipe 49 at a portion corresponding to the gap S1 in the axial direction O. The outer layer member 42 is disposed coaxially with the rehabilitating pipe 41 (second rehabilitating pipe 46). The outer diameter of the outer layer member 42 is larger than the outer diameter of the rehabilitating pipe 41 (second rehabilitating pipe 46). The radial distance L1 between the outer layer member 42 and the piping structure 10 is preferably 20 mm or more and 50 mm or less. The distance L1 here means the minimum radial distance between the outer layer member 42 and the piping structure 10. Although not shown, if there is a portion on the outer periphery of the rehabilitation pipe 41 that corresponds to the expansion joint 13, an outer layer member 42 is provided on the outer periphery of the rehabilitation pipe 41.

[0027] The outer layer member 42 has a plurality of divided pieces 58 arranged in the circumferential direction. As shown in Fig. 2, each divided piece 58 has a rectangular shape when viewed in the direction of the axis O. That is, each side surface (surfaces parallel to the axis O) of the divided piece 58 is flat. Each divided piece 58 (outer layer member 42) is made of a foam. For example, each divided piece 58 is made of expanded polystyrene (EPS). For example, the radially inner ends of circumferentially adjacent segments 58 are in contact with each other. On the other hand, a gap S6 is formed in the circumferential direction between the radially outer ends of circumferentially adjacent segments 58. 1 and 2, the multiple segments 58 are fixed to the second rehabilitation pipe 49 by fixing members 59 such as bands before being joined together, and are surrounded from the radially outer side.

[0028] For example, the filler 65 is air mortar. The filler 65 is disposed between the piping structure 10 and the rehabilitating pipe 41 and the outer layer member 42 (the rehabilitating pipe structure 40). As shown in FIG. 1, the radial length L4 of the filler 65 in the portion where the outer layer member 42 is provided is shorter than the radial length (thickness) L3 of the filler 65 in the portion where the outer layer member 42 is not provided.

[0029] The rehabilitation method of the present embodiment for rehabilitating the piping structure 10 includes a rehabilitation pipe arrangement step S11, an exterior member arrangement step S12, and a filler arrangement step S13. First, in the rehabilitating pipe arrangement step S11, the rehabilitating pipe 41 is arranged in the piping structure 10. Next, in the exterior member arranging step S12, an outer layer member 42 is provided on a portion of the outer circumferential surface of the rehabilitating pipe 41 that corresponds to the expansion joint 13 in the axial direction O. The rehabilitating pipe 41 may be inserted into the piping after the exterior member arranging step S12. Also, the rehabilitating pipe arranging step S11 may be performed after the exterior member arranging step S12. In the filler placement step S13, the filler 65 is placed between the piping structure 10 and the rehabilitating pipe 41 and outer layer member 42. At this time, the filler 65 before hardening (hereinafter referred to as unhardened filler) is filled as air mortar. Since the unhardened filler flows through the gaps S6 between the divided pieces 58, it becomes easier to fill the filler 65 between the piping structure 10 and the rehabilitating pipe 41 and outer layer member 42.

[0030] In the rehabilitation piping structure 1 configured as above, water for the hydroelectric power plant flows within the rehabilitation pipe structure 40 from the upstream side D2 to the downstream side D1. For example, when the rehabilitating pipe structure 40 shrinks due to a temperature difference, the first rehabilitating pipe 45 and the second rehabilitating pipe 49 move closer to each other so that the gap S4 becomes smaller. When the piping structure 10 shrinks due to a temperature difference, the first steel pipe 11 and the second steel pipe 12 move closer to each other so that the gaps S1 and S2 become smaller.

[0031] As described above, according to the rehabilitated piping structure 1 and the rehabilitation method of the present embodiment, water that previously flowed through the piping structure 10 flows through the rehabilitation pipe 41 provided in the piping structure 10 via the filler 65. Therefore, the filler 65 and the rehabilitation pipe 41 can rehabilitate the piping structure 10. Furthermore, the radial length of the filler 65 disposed between the piping structure 10 and the rehabilitated pipe 41 and the outer layer member 42 is shorter (rehabilitated to be shorter) in the portion where the outer layer member 42 is provided than in the portion where the outer layer member 42 is not provided. Therefore, in the direction of the axis O, the filler 65 in the portion where the outer layer member 42 is provided can be more easily broken than the filler 65 in the portion where the outer layer member 42 is not provided. An expansion joint 13 is disposed radially outside the portion where the outer layer member 42 is provided. Since the expansion joint 13 is connected to the radial outside of the easily breakable filler 65, the expandability of the piping structure 10 can be maintained even when the piping structure 10 expands and contracts in the direction of the axis O due to the expansion joint 13.

[0032] The outer layer member 42 is made of a foam. By making the outer layer member 42 of a foam, which has a relatively light mass, the outer layer member 42 can be easily transported and installed. The outer layer member 42 has a plurality of divided pieces 58. Because the outer layer member 42 is divided into a plurality of divided pieces 58, the divided pieces 58 separated from the outer layer member 42 can be easily transported and installed. In addition, the orientation between adjacent divided pieces 58 in the circumferential direction can be easily adjusted, and the plurality of divided pieces 58 can be arranged along the outer peripheral surface of the rehabilitation pipe 41.

[0033] The distance L1 between the outer layer member 42 and the piping structure 10 is 20 mm or more and 50 mm or less. Therefore, the rehabilitation pipe 41 can be easily arranged, and the air mortar can be quickly filled.

[0034] As in the outer layer member 70 of a first modified example shown in Fig. 3, the outer layer member 70 may have a connecting member 71 that connects the multiple segments 58 to each other. Note that Fig. 3 shows the outer layer member 70 in a flat developed state. The connecting member 71 extends in the circumferential direction. In this example, the connecting member 71 is formed in a sheet shape from a flexible synthetic resin or the like. For example, the connecting member 71 and the divided pieces 58 are connected by an adhesive. The outer layer member 70 is used by being wrapped around the outer circumferential surface of the rehabilitating pipe 41 (second rehabilitating pipe 49). In the outer layer member 70 of this modified example, the multiple segments 58 are connected together by the connecting members 71, making the multiple segments 58 easier to handle.

[0035] Furthermore, the shape of the split piece 58 when viewed in the axis O direction is not limited to a rectangular shape. 4 has a trapezoidal shape when viewed in the direction of the axis O. That is, the distance between a pair of side surfaces 75a facing in the circumferential direction of the segment 75 gradually decreases toward the radially inward side. In this modification, a side surface 75b facing radially outward and a side surface 75c facing radially inward of the segment 75 are both flat. 5, a segment 76 of the third modified example has side surfaces 76b, 76c with different shapes from the segment 75 of the second modified example. The side surfaces 76b, 76c are each curved so as to be convex radially outward. The side surface 76c is formed in a shape corresponding to the outer circumferential surface of the second rehabilitation pipe 49.

[0036] The outer layer member may be made of a non-foamed synthetic resin, etc. The outer layer member may be integrally formed of a tubular member.

[0037] Second embodiment Next, a second embodiment of the present invention will be described with reference to FIG. 6. The same components as those in the above embodiment are designated by the same reference numerals, and their description will be omitted. Only the differences will be described. In the rehabilitating piping structure 2 of the present embodiment, the receiving port 50 of the second rehabilitating pipe 46 also serves as an outer layer member. That is, the receiving port 50 is provided in a portion of the outer circumferential surface of the rehabilitating pipe 41 that corresponds to the expansion joint 13 in the direction of the axis O. In the rehabilitating piping structure 2, an outer layer member made of a foam is not used.

[0038] In the rehabilitating piping structure 2 of the present embodiment, the piping structure 10 can be rehabilitated while maintaining the elasticity of the piping structure 10. Furthermore, the end of the first rehabilitating pipe 45 moves in the axial O direction within the receiving port 50, so that the first rehabilitating pipe 45 and the second rehabilitating pipe 49 can expand and contract in the axial O direction as a whole. Furthermore, since the outer layer member is the receiving port 50, even if the first rehabilitation pipe 45 and the second rehabilitation pipe 49 do not have a member other than the receiving port 50, the receiving port 50 can be used as the outer layer member.

[0039] Although the first and second embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention also includes modifications, combinations, deletions, etc. of the configurations within the scope of the gist of the present invention. Furthermore, it goes without saying that the configurations shown in each embodiment can be used in appropriate combinations. For example, in the first and second embodiments, the rehabilitation piping structures 1 and 2 are not limited to be used in hydroelectric power plants, but may also be used in various types of plant equipment, drainage equipment, and the like. [Explanation of symbols]

[0040] 1,2 Rehabilitation piping structure 10 Piping structure 13 Expansion joints 41 Rehabilitation pipe 42 Outer layer material 45 1st rehabilitation pipe (1st rehabilitation pipe) 49 Second Rehabilitation Pipe 58 Split piece 65 Filler 71 Connecting members L1 distance O axis

Claims

1. A piping structure provided with an expansion joint; A rehabilitation pipe disposed in the piping structure; an outer layer member provided on an outer peripheral surface of the rehabilitating pipe at a portion corresponding to the expansion joint in the axial direction of the piping structure, the outer layer member having an outer diameter larger than that of the rehabilitating pipe; a filler disposed between the piping structure, the rehabilitation pipe, and the outer layer member; Equipped with The outer layer member of the rehabilitated piping structure is formed of a foam.

2. A piping structure provided with an expansion joint; A rehabilitation pipe disposed in the piping structure; an outer layer member provided on an outer peripheral surface of the rehabilitating pipe at a portion corresponding to the expansion joint in the axial direction of the piping structure, the outer layer member having an outer diameter larger than that of the rehabilitating pipe; a filler disposed between the piping structure, the rehabilitation pipe, and the outer layer member; Equipped with The outer layer member has a plurality of divided pieces arranged in a circumferential direction of the piping structure.

3. The rehabilitating piping structure according to claim 2 , wherein the outer layer member has a connecting member that connects the plurality of divided pieces to each other.

4. A piping structure provided with an expansion joint; A rehabilitation pipe disposed in the piping structure; an outer layer member provided on an outer peripheral surface of the rehabilitating pipe at a portion corresponding to the expansion joint in the axial direction of the piping structure, the outer layer member having an outer diameter larger than that of the rehabilitating pipe; a filler disposed between the piping structure, the rehabilitation pipe, and the outer layer member; Equipped with The rehabilitation pipe is A first rehabilitation pipe; a second rehabilitating pipe disposed at a position shifted in the axial direction relative to the first rehabilitating pipe; a receiving port which is an outer layer member provided on an outer peripheral surface of an end portion of the second rehabilitating pipe and into which an end portion of the first rehabilitating pipe is disposed; A rehabilitated piping structure having the above structure.

5. The rehabilitating piping structure according to claim 1 , wherein a distance between the outer layer member and the piping structure in a radial direction of the piping structure is 20 mm or more and 50 mm or less.

6. A rehabilitation method for a piping structure provided with an expansion joint, comprising the steps of: A rehabilitation pipe is placed in the piping structure; an outer layer member made of a foam having an outer diameter larger than that of the rehabilitating pipe is provided at a portion of the outer peripheral surface of the rehabilitating pipe that corresponds to the expansion joint in the axial direction of the piping structure; A rehabilitation method comprising disposing a filler between the piping structure and the rehabilitation pipe and the outer layer member.

7. A rehabilitation method for a piping structure provided with an expansion joint, comprising the steps of: A rehabilitation pipe is placed in the piping structure; an outer layer member having a larger outer diameter than the rehabilitating pipe and including a plurality of divided pieces arranged in a circumferential direction of the piping structure, the outer layer member being provided at a portion of the outer peripheral surface of the rehabilitating pipe that corresponds to the expansion joint in the axial direction of the piping structure; A rehabilitation method comprising disposing a filler between the piping structure and the rehabilitation pipe and the outer layer member.

8. A rehabilitation method for a piping structure provided with an expansion joint, comprising the steps of: In the piping structure, A first rehabilitation pipe; a second rehabilitating pipe disposed at a position shifted in an axial direction relative to the first rehabilitating pipe; a receiving port which is an outer layer member provided on an outer peripheral surface of the end portion of the second rehabilitating pipe and into which the end portion of the first rehabilitating pipe is disposed; A rehabilitation pipe having the above structure is disposed. The outer layer member having an outer diameter larger than that of the rehabilitating pipe is provided at a portion of the outer peripheral surface of the rehabilitating pipe that corresponds to the expansion joint in the axial direction of the piping structure, A rehabilitation method comprising disposing a filler between the piping structure and the rehabilitation pipe and the outer layer member.

Images