JP2022149331A - Regeneration piping structure and regeneration method - Google Patents

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 The present invention relates to a rehabilitation piping structure and a rehabilitation method.

Conventionally, penstocks used in hydroelectric power stations were constructed as follows (see Patent Document 1, for example). That is, the pipe is manufactured in a factory. The tube is transported to the site installation location, which is typically an inclined plane. Circumferential joints of pipes are welded to connect pipes to form penstocks.

JP-A-60-037318

Some hydraulic iron pipes (piping structures) are provided with expansion joints as a countermeasure against expansion and contraction due to external temperature. Expansion joints allow the steel pipes that make up the penstock to move axially relative to each other. This allows the penstock to expand and contract in the axial direction.
In addition, after using the penstock for a certain period of time, it will be necessary to rehabilitate the penstock. In this case, it is desired to rehabilitate the penstock while maintaining the elasticity of the penstock.

The present invention has been made in view of such problems, and an object of the present invention is to provide a rehabilitation piping structure and a rehabilitation method that can rehabilitate the piping structure while maintaining the elasticity of the piping structure.

In order to solve the above problems, the present invention proposes the following means.
A rehabilitation pipe structure of the present invention includes a piping structure provided with an expansion joint, a rehabilitation pipe arranged in the piping structure, and an outer peripheral surface of the rehabilitation pipe corresponding to the expansion joint in the axial direction of the piping structure. It is characterized by comprising an outer layer member that is provided in a portion that connects and has an outer diameter larger than that of the rehabilitating pipe, and a filling material that is arranged between the piping structure and the rehabilitating pipe and the outer layer member.
Further, the rehabilitation method of the present invention is a rehabilitation method for rehabilitating a piping structure provided with an expansion joint, wherein a rehabilitation pipe is arranged in the piping structure, and an axis line of the piping structure is arranged on an outer peripheral surface of the rehabilitation pipe. An outer layer member having an outer diameter larger than that of the rehabilitated pipe is provided in a portion corresponding to the expansion joint in the direction, and a filler is arranged between the pipe structure, the rehabilitated pipe, and the outer layer member. there is

According to these inventions, the fluid such as water that has flowed through the piping structure so far flows through the rehabilitating pipe provided in the piping structure via the filler. Therefore, the pipe structure can be rehabilitated by the filling material and the rehabilitated pipe.
In addition, the length (thickness) of the filler disposed between the piping structure and the rehabilitating pipe and the outer layer member in the radial direction of the rehabilitating pipe is greater than the portion where the outer layer member is not provided. part is short (rehabilitated to be short). Therefore, in the axial direction, the filler in the portion provided with the outer layer member can be broken more easily than the filler in the portion not provided with the outer layer member. An expansion joint is arranged radially outside the portion where the outer layer member is provided. Since the expansion joint is connected to the radially outer side of the easily breakable filler, even if the expansion joint expands and contracts the piping structure in the axial direction, the elasticity of the piping structure can be maintained.

Moreover, in the rehabilitation piping structure, the outer layer member may be made of a foam.
According to this invention, the outer layer member can be easily transported and installed by forming the outer layer member from a foam having a relatively light weight.

Moreover, in the rehabilitation piping structure, the outer layer member may have a plurality of split 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 split pieces, the split pieces separated from the outer layer member can be easily transported and installed. In addition, it is possible to easily adjust the orientation between the split pieces adjacent to each other in the circumferential direction, and to line up the plurality of split pieces along the outer peripheral surface of the rehabilitating pipe.

Moreover, in the rehabilitation piping structure, the outer layer member may include a connecting member that connects the plurality of split pieces to each other.
According to this invention, since the plurality of split pieces are integrally connected by the connecting member, the plurality of split pieces can be easily handled.

In addition, in the rehabilitation pipe structure, the rehabilitation pipe includes a first rehabilitation pipe, a second rehabilitation pipe that is displaced in the axial direction with respect to the first rehabilitation pipe, and a second rehabilitation pipe. and a receptacle which is the outer layer member provided on the outer peripheral surface of the end portion and in which the end portion of the first rehabilitating pipe is arranged.
According to this invention, by moving the end portion of the first rehabilitating pipe in the axial direction within the socket, the first rehabilitating pipe and the second rehabilitating pipe can expand and contract in the axial direction as a whole.
Since the outer layer member is the socket, the socket can be used as the outer layer member even if the first rehabilitation pipe and the second rehabilitation pipe do not have a member other than the socket.

Further, in the rehabilitation piping structure, the distance between the outer layer member and the piping structure in the radial direction of the piping structure may be 20 mm or more and 50 mm or less.
According to this invention, the rehabilitation pipe can be easily arranged.

According to the rehabilitation piping structure and rehabilitation method of the present invention, it is possible to rehabilitate the piping structure while maintaining the flexibility of the piping structure.

1 is a cross-sectional view of a rehabilitation pipe structure according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view taken along a cutting line A1-A1 in FIG. 1; FIG. It is a perspective view of the state where the outer layer member of the rehabilitation piping structure in the 1st modification of the embodiment of the present invention was unfolded. It is a figure which shows the shape which looked at the split piece in the axial direction in the 2nd modification of embodiment of this invention. It is a figure which shows the shape which looked at the division|segmentation piece in the axial direction in the 3rd modification of embodiment of this invention. It is a cross-sectional view of a rehabilitating pipe structure according to a second embodiment of the present invention.

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

Here, the pipe structure 10, the rehabilitation pipe structure 40, and the filler 65 are formed in a cylindrical shape. The central axis (axis line) of each of the piping structure 10, the rehabilitation pipe structure 40, and the filler 65 is arranged coaxially with the common axis. The common axis will be referred to as axis O below. A direction along the axis O is called an axis O direction. Among the directions of the axis O, the direction in which water flows in the piping structure 10 is called the downstream side D1, and the side opposite to the downstream side D1 is called the upstream side D2. When the rehabilitation pipe structure 1 is viewed from the direction of the axis O, the direction orthogonal to the axis O is called the radial direction, and the direction of rotation around the axis O is called the circumferential direction.

The configuration of the piping structure 10 is not particularly limited as long as the expansion joint 13 is provided at an intermediate portion 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 an expansion joint 13 .
The first steel pipe 11 and the second steel pipe 12 are formed in a tubular shape from steel. The inner diameter of the first steel pipe 11 is the same as the inner diameter of the second steel pipe 12 , and the outer diameter of the first steel pipe 11 is the same as the outer diameter of the second steel pipe 12 . For example, the inner diameters of the steel pipes 11 and 12 are 1200 mm.
The second steel pipe 12 is arranged so as to be shifted in the direction of the axis O with respect to the first steel pipe 11 . In this embodiment, the second steel pipe 12 is arranged downstream D1 of the first steel pipe 11 . A gap S1 is formed in the direction of the axis O between the first steel pipe 11 and the second steel pipe 12 .

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 downstream D1. The second extension member 17 extends the second steel pipe 12 radially outward.
First extension member 16 has a body 21 and a flange 22 . The main body 21 is tubular. The main body 21 covers the outer peripheral surface of the end portion of the first steel pipe 11 on the downstream side D<b>1 and is arranged coaxially with the first steel pipe 11 . The main body 21 protrudes downstream D<b>1 from 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 downstream D1 end of the main body 21 . The flange 22 is formed over the entire circumference of the main body 21 . A through hole 22a is formed through the flange 22 in the direction of the axis O. As shown in FIG. A plurality of through-holes 22a are formed at intervals in the circumferential direction.

For example, the second extension member 17 has a body 26 , a flange 27 , a sealing member 28 and a retaining 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 peripheral surface of the end portion of the second steel pipe 12 on the upstream side D2. 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 axis O direction. The sealing member 28 is made of synthetic resin or the like. The sealing member 28 water-tightly seals with the main body 21 .

The main body 21 of the first extension member 16 covers the outer peripheral surfaces of the main body 26, the sealing member 28, and the holding member 29 from the radially outer side. The main body 21 is relatively movable in the direction of the axis O with respect to the main body 26 , the sealing member 28 and the holding member 29 .
The flange 27 protrudes radially outward from the downstream D1 end of the main body 26 . A flange 27 is formed around the entire circumference of the main body 26 . A through hole 27a is formed through the flange 27 in the direction of the axis O. As shown in FIG. A plurality of through holes 27a are formed at intervals in the circumferential direction. The flange 27 is spaced downstream D1 from the main body 21 of the first extension member 16 . A gap S2 is formed in the direction of the axis O between the flange 27 and the main body 21 . Each through hole 27a is formed so as to face the through hole 22a of the first extension member 16 in the direction of the axis O. As shown in FIG.

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 along the entire length of the shaft portion (reference numerals omitted) of the bolt 32 . The shaft portions are arranged 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 (not numbered) of the bolt 32 is fixed to the first end of the shaft. The diameter of the head is larger than the diameter of the through hole 27 a of the second extension member 17 . The head contacts the opening peripheral edge of the through hole 27a in the flange 27 of the second extension member 17 from the downstream side D1 of the flange 27. As shown in FIG.
The nut 33 is formed with a female thread that fits into the male thread of the shaft portion of the bolt 32 . The nut 33 contacts the opening peripheral edge 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.

In the piping structure 10 configured as described above, the first steel pipe 11 and the second steel pipe 12 move in the direction of the axis O until the main body 21 of the first extension member 16 contacts the flange 27 of the second extension member 17. can move to The expansion joint 13 connects the first steel pipe 11 and the second steel pipe 12 watertightly and relatively movably in the axis O direction.

A rehabilitation pipe structure 40 is disposed within the pipe structure 10 . The rehabilitation pipe structure 40 has a rehabilitation pipe 41 and an outer layer member 42 .
The rehabilitation pipe 41 is arranged within the piping structure 10 . The rehabilitation pipe 41 has a first rehabilitation pipe (first rehabilitation pipe) 45 and a second rehabilitation pipe 46 .
For example, the first rehabilitation pipe 45 is made of FRP (Fiber Reinforced Plastics) or FRPM (Fiberglass Reinforced Plastic Mortar). As the first rehabilitating pipe 45 made of FRPM, Eslon RCP (registered trademark, manufactured by Sekisui Chemical Co., Ltd.) can be preferably used.

The second rehabilitation pipe 46 has a second rehabilitation pipe 49 and a socket 50 . The second rehabilitation pipe 49 is configured similarly to the first rehabilitation pipe 45 . The inner diameter of the second rehabilitating pipe 49 is the same as the inner diameter of the first rehabilitating pipe 45 , and the outer diameter of the second rehabilitating pipe 49 is the same as the outer diameter of the first rehabilitating 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 arranged with a position shifted in the direction of the axis O with respect to the first rehabilitation pipe 45 . In this embodiment, the second rehabilitation pipe 49 is arranged downstream D1 of the first rehabilitation pipe 45 . A gap S4 is formed in the direction of the axis O between the first rehabilitation pipe 45 and the second rehabilitation pipe 49 .

The receptacle 50 has a main body 51 , a first protrusion 52 and a second protrusion 53 . The main body 51 is tubular. The main body 51 covers the outer peripheral surface of the second rehabilitation pipe 49 and is arranged coaxially with the second rehabilitation pipe 49 . The main body 51 protrudes upstream D<b>2 from the second rehabilitation pipe 49 .
The first protrusion 52 protrudes radially inward from the end of the main body 51 on the downstream side D<b>1 . The first projecting portion 52 is formed over the entire circumference of the main body 51 . The second protruding portion 53 protrudes radially inward from the end of the main body 51 on the upstream side D2. The second projecting portion 53 is formed over the entire circumference of the main body 51 . The socket 50 is made of the same material as the first rehabilitation pipe 45 .
A sealing member 54 is arranged on the inner peripheral surface of the main body 51 on the upstream side D2.
The socket 50 is fixed to the second rehabilitation pipe 49 by a cylindrical fixing member 55 . The fixing member 55 is arranged between the second rehabilitation pipe 49 and the main body 51 of the socket 50 . The socket 50 is provided on the outer peripheral surface of the end of the second rehabilitation pipe 49 on the upstream side D2.
The downstream D1 end of the first rehabilitation pipe 45 is arranged in the main body 51 and the second projecting portion 53 of the socket 50 . The sealing member 54 watertightly seals between the main body 51 of the socket 50 and the first rehabilitation pipe 45 . The first rehabilitation pipe 45 is relatively movable in the direction of the axis O with respect to the socket 50 .

As shown in FIGS. 1 and 2, the outer layer member 42 is tubular. The outer layer member 42 is provided at a portion of the outer peripheral surface of the rehabilitating pipe 41 (second rehabilitating pipe 46) corresponding to the expansion joint 13 in the direction of the axis O (a portion located radially inside the expansion joint 13). More specifically, the outer layer member 42 is provided at a portion of the outer peripheral surface of the second rehabilitating pipe 49 that corresponds to the gap S1 in the direction of the axis O. As shown in FIG. The outer layer member 42 is arranged coaxially with the rehabilitation pipe 41 (second rehabilitation 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). A 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 referred to here means the minimum distance among the radial distances between the outer layer member 42 and the piping structure 10 .
Although not shown, if there is a portion corresponding to the expansion joint 13 on the outer circumference of the rehabilitation pipe 41 , an outer layer member 42 is provided on the circumference of the rehabilitation pipe 41 .

The outer layer member 42 has a plurality of split pieces 58 arranged side by side in the circumferential direction. As shown in FIG. 2, each split piece 58 has a rectangular shape when viewed in the direction of the axis O. As shown in FIG. That is, each side surface (surface parallel to the axis O) of the split piece 58 is flat. Each split piece 58 (outer layer member 42) is made of foam. For example, each split piece 58 is made of expanded polystyrene (EPS).
For example, the radially inner ends of the split pieces 58 that are adjacent in the circumferential direction 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 the split pieces 58 that are adjacent in the circumferential direction.
As shown in FIGS. 1 and 2, the plurality of split pieces 58 are fixed by a fixing member 59 such as a band before being joined and surrounded from the outside in the radial direction. A plurality of split pieces 58 are fixed to the second rehabilitation pipe 49 by fixing members 59 .

For example, the filler 65 is air mortar. The filler 65 is arranged between the pipe structure 10, the rehabilitation pipe 41 and the outer layer member 42 (the rehabilitation pipe structure 40).
As shown in FIG. 1, the radial length (thickness) L3 of the filler 65 in the portion where the outer layer member 42 is provided is greater than the radial length (thickness) L3 of the filler 65 in the portion where the outer layer member 42 is provided. length L4 is short.

The rehabilitation method of the present embodiment for rehabilitating the piping structure 10 includes a rehabilitation pipe placement step S11, an exterior member placement step S12, and a filler placement step S13.
First, in the rehabilitation pipe arrangement step S11, the rehabilitation pipe 41 is arranged in the piping structure 10 .
Next, in the exterior member placement step S12, the outer layer member 42 is provided at a portion of the outer peripheral surface of the rehabilitating pipe 41 corresponding to the expansion joint 13 in the direction of the axis O. As shown in FIG. Note that the rehabilitating pipe 41 may be inserted into the pipe after the exterior member arranging step S12. Further, the rehabilitating pipe arranging step S11 may be performed after the exterior member arranging step S12.
In the filler placement step S<b>13 , the filler 65 is placed between the pipe structure 10 and the rehabilitating pipe 41 and the outer layer member 42 . At this time, the filling material 65 before hardening (hereinafter referred to as unhardened filling material) is filled as air mortar. Since the uncured filler flows through the gap S6 between the split pieces 58, the filler 65 can be easily filled between the piping structure 10 and the rehabilitating pipe 41 and the outer layer member .

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

As described above, according to the rehabilitation pipe structure 1 and the rehabilitation method of the present embodiment, the water that has flowed in the piping structure 10 until now is removed from the rehabilitation pipe provided in the piping structure 10 via the filler 65. 41 inside. Therefore, the pipe structure 10 can be rehabilitated by the filler 65 and the rehabilitated pipe 41 .
In addition, the length in the radial direction of the filler 65 arranged between the pipe structure 10 and the rehabilitation pipe 41 and the outer layer member 42 is longer than the portion where the outer layer member 42 is provided than the portion where the outer layer member 42 is provided. is short (rehabilitated to be short). Therefore, in the direction of the axis O, the filling material 65 in the portion where the outer layer member 42 is provided can be broken more easily than the filling material 65 in the portion where the outer layer member 42 is not provided. The expansion joint 13 is arranged radially outside the portion where the outer layer member 42 is provided. Since the expansion joint 13 is connected to the radially outer side of the filling material 65 which can be easily broken, even when the piping structure 10 expands and contracts in the direction of the axis O by the expansion joint 13, the elasticity of the piping structure 10 can be maintained. can be done.

The outer layer member 42 is made of foam. By forming the outer layer member 42 from a foam having a relatively light mass, the outer layer member 42 can be easily transported and installed.
The outer layer member 42 has a plurality of split pieces 58 . Since 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, it is possible to easily adjust the orientation between the split pieces 58 adjacent in the circumferential direction, and to line up the plurality of split pieces 58 along the outer peripheral surface of the rehabilitating pipe 41 .

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

Like the outer layer member 70 of the first modified example shown in FIG. 3, the outer layer member 70 may have connecting members 71 that connect the plurality of split pieces 58 to each other. Note that FIG. 3 shows a state in which the outer layer member 70 is flatly developed. The connecting member 71 extends in the circumferential direction.
In this example, the connecting member 71 is formed in a sheet shape from flexible synthetic resin or the like. For example, the connecting member 71 and the split piece 58 are connected with an adhesive. The outer layer member 70 is used by being wound around the outer peripheral surface of the rehabilitating pipe 41 (second rehabilitating pipe 49).
In the outer layer member 70 of this modified example, since the plurality of split pieces 58 are integrally connected by the connecting member 71, the plurality of split pieces 58 are easy to handle.

Moreover, the shape of the split piece 58 when viewed in the direction of the axis O is not limited to a rectangular shape.
A split piece 75 of the second modification shown in FIG. 4 has a trapezoidal shape when viewed in the direction of the axis O. As shown in FIG. That is, the distance between the pair of side surfaces 75a of the split piece 75 facing in the circumferential direction gradually decreases radially inward. In this modification, a radially outwardly facing side surface 75b and a radially inwardly facing side surface 75c of the split piece 75 are each flat.
A split piece 76 of a third modification shown in FIG. 5 differs from the split piece 75 of the second modification in the shape of side surfaces 76b and 76c. The side surfaces 76b and 76c are each curved so as to be convex radially outward. The side surface 76 c is formed in a shape corresponding to the outer peripheral surface of the second rehabilitation pipe 49 .

Note that the outer layer member may be formed of non-foamed synthetic resin or the like. The outer layer member may be integrally formed with a cylindrical member.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 6. Parts that are the same as those of the above-described embodiment are denoted by the same reference numerals and description thereof will be omitted, and only different points will be described.
In the rehabilitation pipe structure 2 of this embodiment, the socket 50 of the second rehabilitation pipe 46 also serves as an outer layer member. That is, the socket 50 is provided at a portion of the outer peripheral surface of the rehabilitation pipe 41 that corresponds to the expansion joint 13 in the direction of the axis O. As shown in FIG. In the rehabilitation pipe structure 2, no outer layer member made of foam is used.

In the rehabilitated piping structure 2 of this embodiment, the piping structure 10 can be rehabilitated while maintaining the flexibility of the piping structure 10 . Furthermore, by moving the end of the first rehabilitating pipe 45 in the direction of the axis O within the socket 50, the first rehabilitating pipe 45 and the second rehabilitating pipe 49 can expand and contract in the direction of the axis O as a whole.
Since the outer layer member is the socket 50, the socket 50 can be used as the outer layer member even if the first rehabilitation pipe 45 and the second rehabilitation pipe 49 do not have a member other than the socket 50. .

As described above, the first embodiment and the second embodiment of the present invention have been described in detail with reference to the drawings. change, combination, deletion, etc. of Furthermore, it goes without saying that the configurations shown in the respective embodiments can be used in combination as appropriate.
For example, in the first embodiment and the second embodiment, the rehabilitating pipe structures 1 and 2 are not limited to hydroelectric power plants, and may be used in various plant facilities, drainage facilities, and the like.

1, 2 rehabilitation pipe structure 10 piping structure 13 expansion joint 41 rehabilitation pipe 42 outer layer member 45 first rehabilitation pipe (first rehabilitation pipe)
49 Second rehabilitation pipe 58 Split piece 65 Filler 71 Connecting member L1 Distance O Axis

Claims (7)

a piping structure provided with an expansion joint;
a rehabilitation pipe disposed within the piping structure;
an outer layer member provided at a portion corresponding to the expansion joint in the axial direction of the piping structure on the outer peripheral surface of the rehabilitating pipe and having an outer diameter larger than that of the rehabilitating pipe;
a filler disposed between the piping structure, the rehabilitating pipe and the outer layer member;
Rehabilitation piping structure. The rehabilitation pipe structure according to claim 1, wherein the outer layer member is made of foam. The rehabilitation pipe structure according to claim 2, wherein the outer layer member has a plurality of split pieces arranged side by side in the circumferential direction of the pipe structure. The rehabilitation pipe structure according to claim 3, wherein the outer layer member has a connecting member that connects the plurality of split pieces to each other. The rehabilitation pipe is
a first rehabilitation pipe;
a second rehabilitated pipe displaced in the axial direction with respect to the first rehabilitated pipe;
a socket that is the outer layer member provided on the outer peripheral surface of the end of the second rehabilitated pipe and in which the end of the first rehabilitated pipe is arranged;
The rehabilitation piping structure according to claim 1, having The rehabilitation piping structure according to any one of claims 1 to 5, wherein the distance between the outer layer member and the piping structure in the radial direction of the piping structure is 20 mm or more and 50 mm or less. A rehabilitation method for rehabilitating a piping structure provided with an expansion joint,
Placing a rehabilitation pipe in the piping structure,
An outer layer member having an outer diameter larger than that of the rehabilitating pipe is provided at a portion corresponding to the expansion joint in the axial direction of the piping structure on the outer peripheral surface of the rehabilitating pipe,
A rehabilitation method comprising placing a filler between the piping structure and the rehabilitation pipe and the outer layer member.

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