JP7032171B2 - Rehabilitation method for strip members and existing pipes - Google Patents

Description

The present invention relates to, for example, a strip-shaped member lined with an old existing buried pipe to become a rehabilitation pipe and a method for rehabilitating the existing pipe, and particularly to a strip-shaped member suitable for composite pipe design and a method for rehabilitating an existing pipe.

The SPR (Sewage Pipe Renewal) method is known as a method for rehabilitating an existing pipe such as an aged sewer pipe. In this method, a strip-shaped member (profile) made of rigid polyvinyl chloride is spirally formed along the inner surface of the existing pipe, and a backfill material is injected into the gap between the existing pipe and the existing pipe to strengthen the existing pipe. (See Patent Documents 1 and 2 etc.).
The profile used in the SPR method has ribs formed to improve the strength. The cross section of the rib is T-shaped. Also known are profiles to which a reinforcing strip made of steel is added for higher rigidity. The cross section of the reinforcing strip is approximately W-shaped. The reinforcing strip is integrated with the profile by fitting the end of the reinforcing strip into the hooked portion of the rib.

Japanese Unexamined Patent Publication No. 2011-194659 Japanese Unexamined Patent Publication No. 2002-147650

Composite pipe design is known as a rational design method that utilizes the strength of existing pipes. In the composite pipe design, the strength is ensured by integrating the existing pipe, the backfill material, and the strip-shaped member (profile). In particular, the ribs on the T-shaped cross section of the profile can exert an anchoring effect and enhance the integrity of the backfill material and the profile.
On the other hand, when designing a composite pipe using a profile in which a reinforcing strip material is fitted, it is necessary to consider the integrity of the profile and the backfill material. For example, by interposing the reinforcing strip material between the ribs, cracks do not run in the backfill material so as to connect these ribs with the outer peripheral end surface (the surface facing the inner surface of the existing pipe) of the reinforcing strip material. It is necessary to do so.
In view of such circumstances, it is an object of the present invention to provide a band-shaped member (profile) having a reinforcing band material suitable for composite pipe design while ensuring integration with the backfill material.

In order to solve the above-mentioned problems, the present invention is a strip-shaped member which is made into a rehabilitation pipe along the inner circumference of an existing pipe through a backfill filling space.
A main band made of synthetic resin having a fitting receiving portion open to the outer peripheral side,
A reinforcing band material provided on the outer peripheral side of the main band material is provided.
The reinforcing strip includes an anchoring portion having an anchoring working surface facing the backfill filling space, and the anchoring working surface is tilted toward the inner peripheral side or directed toward the inner peripheral side. It is characterized by.
The "outer peripheral side" refers to the side facing the outer circumference or the radial outer side when the strip-shaped member is made into a rehabilitation pipe. The "inner peripheral side" refers to the side facing the inner peripheral or radial inward when the strip-shaped member is made into the rehabilitation pipe.
The backfill filling space between the rehabilitation pipe and the existing pipe is filled with the backfill material. The anchoring surface of the anchoring portion comes into contact with the backfilling material. When the backfilling material tries to be displaced toward the outer peripheral side relative to the rehabilitation pipe due to an external force such as a bending moment or vibration, the anchor acting portion is locked to the backfilling material from the outer peripheral side. As a result, the anchor effect works, and the interfacial peeling between the backfill material and the strip-shaped member is suppressed. As a result, the integration of the existing pipe, the backfill material, and the rehabilitation pipe is improved, and the performance as a composite pipe can be maintained.

It is preferable that the anchor acting portion is arranged so as to project toward the outer peripheral side from the main band member.
As a result, the anchoring portion and the backfilling material can be firmly caught, and the integration is further enhanced.

The reinforcing strip includes a body portion that is convex toward the outer peripheral side, and at least one of the pair of side walls of the body portion is an inclined wall that is inclined toward the outer peripheral side and opposite to the other side wall. It is preferable to have a portion.
The inclined wall portion serves as an anchor acting portion, and the outer surface of the inclined wall portion serves as an anchor acting surface that is tilted toward the inner peripheral side and faces the backfill filling space. Thereby, the anchor effect can be expressed.
It is more preferable that both of the pair of side walls of the body portion have the inclined wall portion.

It is preferable that the main band member has a reinforcing band holding portion that holds the reinforcing band member from the inside of the body portion.
The reinforcing band holding portion can prevent the reinforcing band material from coming off from the main band material. Thereby, the anchor effect can be surely expressed.
It is preferable that the reinforcing band holding portion is inserted into the inside of the body portion and pressed against the inner surface of the pair of side walls.
The main band material is formed with ribs protruding toward the outer peripheral side, and the ribs are inserted into the inside of the body portion and pressed against the inner surface of the side wall to form the reinforcing band holding portion. You may.

The pair of side walls of the body portion has a base wall portion that is close to each other or is substantially upright from the end portion on the inner peripheral side toward the outer peripheral side, and the inclined wall portion is located on the outer peripheral side of the base wall portion. It is preferable that they are connected.
As a result, a crack is formed in the middle portion of the body portion, and the distance between the base wall portions of the pair of side walls increases from the crack to the inner peripheral side, or the distance becomes almost constant. Therefore, at the time of manufacturing the band-shaped member, it becomes easy to insert the reinforcing band holding portion such as a rib into the inside of the body portion. As a result, the reinforcing strip material can be easily fitted into the main strip material, and the manufacture of the strip-shaped member can be facilitated.

A pair of ribs are formed on the main strip so as to be separated from each other in the width direction and protrude toward the outer peripheral side, and these ribs are inserted into the inside of the body portion and pressed against the inner surface of the pair of side walls. It is preferable to have.
This makes it easier to fit the reinforcing strip into the main strip during the manufacture of the strip. Further, the body portion can be formed to be relatively wide, and the production of the reinforcing strip can be facilitated. The pair of ribs serves as the reinforcing band holding portion.

The method of the present invention is a method for rehabilitating an existing pipe, and is characterized in that a rehabilitated pipe is manufactured along the inner circumference of the existing pipe through a backfill filling space by using the strip-shaped member.

According to the present invention, the anchor effect can be exhibited by the reinforcing band material, and the integrity of the band-shaped member and the backfilling material can be ensured.

FIG. 1 is a cross-sectional view of a strip-shaped member according to the first embodiment of the present invention. FIG. 2A is a cross-sectional view of an existing pipe rehabilitated by the strip-shaped member. FIG. 2B is an enlarged cross-sectional view of the circular portion IIb of FIG. 2A. FIG. 3 is a cross-sectional view of the strip-shaped member according to the second embodiment of the present invention. FIG. 4 is a cross-sectional view of the strip-shaped member according to the third embodiment of the present invention. FIG. 5 is a cross-sectional view of the strip-shaped member according to the fourth embodiment of the present invention. FIG. 6 is a cross-sectional view of the strip-shaped member according to the fifth embodiment of the present invention. FIG. 7 is a cross-sectional view of the strip-shaped member according to the sixth embodiment of the present invention. FIG. 8 is a cross-sectional view of the strip-shaped member according to the seventh embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
1 to 2 show the first embodiment of the present invention. As shown in FIG. 2A, the strip-shaped member 3 of the present invention is used as a rehabilitation material for an existing pipe 1 that has deteriorated in the ground. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe. The existing pipe 1 is not limited to the sewer pipe, but may be a water pipe, an agricultural water pipe, a hydroelectric power transmission pipe, a gas pipe, or the like. The composite pipe M is constructed by rehabilitating the existing pipe 1. In the composite pipe M, the rehabilitation pipe 2 made from the strip-shaped member 3 and the existing pipe 1 are structurally integrated via the backfill material 6. Not only the rehabilitation pipe 2 but also the existing pipe 1 shares the strength.

As shown in FIG. 1, the band-shaped member 3 includes a main band member 10 and a reinforcing band member 20. The material of the main band material 10 is a synthetic resin such as polyvinyl chloride. The main strip 10 is formed into a constant cross section by extrusion molding of the synthetic resin, and extends in a long shape in a direction orthogonal to the paper surface of FIG. The main band member 10 includes a flat flat band portion 11, a pair (s) of ribs 15 having a T-shaped cross section (hereinafter referred to as “T rib 15”), and fitting portions 13 and 14. The pair (plural) T-ribs 15 are arranged apart from each other in the width direction (left and right in FIG. 1) of the flat band portion 11 and project from the flat band portion 11 toward the outer peripheral side (upper side in FIG. 1). As shown in FIG. 2B, the “outer peripheral side portion” refers to a side portion facing the outer circumference or the radial outer side when the strip-shaped member 3 is made into the rehabilitation pipe 2.

As shown in FIG. 1, a first fitting portion 13 is provided at one end portion (left end portion in FIG. 1) of the flat band portion 11 in the width direction. A second fitting portion 14 is provided at the other end of the flat band portion 11 in the width direction (the right end portion in FIG. 1). A locking projection 16 is integrally provided on the outer peripheral side portion (upper portion in FIG. 1) of the first fitting portion 13. A locking projection 17 is integrally provided on the outer peripheral side portion of the second fitting portion 14.

A fitting receiving portion 12 is formed between the locking projections 16 and 17 on the outer peripheral side portion (upper portion in FIG. 1) of the main band member 10. The fitting receiving portion 12 is opened to the outer peripheral side (upper side in FIG. 1) and has a concave groove shape divided into three by the pair of T-ribs 15. The fitting receiving portion 12 receives the reinforcing strip 20.

The reinforcing strip 20 is made of a material such as metal, which has higher rigidity than the main strip 10, and is preferably made of a steel strip. The strip is formed into a reinforcing strip 20 having a constant cross section by being bent by a roll forming machine or the like. Specifically, the reinforcing strip 20 includes a central body portion 21 in the width direction (left and right in FIG. 1), a pair of shoulder portions 22 and a pair of arm portions 23 connected to both sides thereof, and has a substantially W-shaped cross section. It extends in the same direction as the main strip 10 (direction orthogonal to the paper surface of FIG. 1).

The body portion 21 has a pair of side walls 24 and an outer peripheral side plate 25, and has a convex shape toward the outer peripheral side (upper side in FIG. 1). Each side wall 24 includes a base wall portion 26 and an inclined wall portion 27. The base wall portion 26 of the pair of side walls 24 is slightly approached or substantially upright from the inner peripheral side end portion (lower end portion in FIG. 1) to the outer peripheral side (upper side in FIG. 1) of the body portion 21. There is.

The inclined wall portion 27 is connected to the outer peripheral side (upper side in FIG. 1) of each base wall portion 26. The inclined wall portion 27 is inclined to the side opposite to the other side wall 24 toward the outer peripheral side (upper side in FIG. 1). A constriction 21c is formed in the middle portion of the body portion 21.
The ends of the pair of inclined wall portions 27 on the outer peripheral side (upper side in FIG. 1) are connected to each other via the outer peripheral side plate 25.

The shoulder portion 22 is connected to the end portion on the inner peripheral side (lower side in FIG. 1) of each base wall portion 26. The shoulder portion 22 is flat along the flat band portion 11. The arm portion 23 is connected to the outer end portion of the shoulder portion 22 in the width direction (left and right in FIG. 1). The arm portion 23 is diagonally folded back from the shoulder portion 22 toward the outer peripheral side (upper side in FIG. 1).
According to the reinforcing strip 20, since the body portion 21 is relatively wide (for example, as compared with FIG. 3 and the like), bending molding by roll forming or the like is easy.
The width dimension of the outer peripheral side plate 25 and thus the width dimension W ₂ of the body portion 21 (FIG. 2 (b)) is preferably about W ₂ = 5 mm to 100 mm.

The reinforcing strip 20 is fitted into the fitting receiving portion 12 of the main strip 10 from the outer peripheral side. The shoulder portion 22 is addressed to the flat band portion 11, and the tip portion of the arm portion 23 is locked to the locking projections 16 and 17. A pair of T-ribs 15 are inserted inside the body portion 21. The flange portion 15f of each T-rib 15 is pressed against the inner surface of the corresponding side wall 24. The reinforcing band member 20 is held from the inside of the body portion 21 by the T rib 15 (reinforcing band holding portion).
Since the distance between the pair of side walls 24 is widened from the constriction 21c toward the inner peripheral side, or the distance is almost constant, the T-rib 15 is inserted inside the body portion 21 at the time of manufacturing the strip-shaped member 3. It will be easier. Further, the pair of T-ribs 15 makes it easier to insert into the inside of the body portion 21. This makes it possible to facilitate the manufacture of the strip-shaped member 3.
The body portion 21 on the outer peripheral side of the vicinity of the constriction 21c, and thus the inclined wall portion 27, protrudes from the main strip 10 toward the outer peripheral side (upper side in FIG. 1).
The protrusion height H (FIG. 2 (b)) is preferably about H = 5 mm to 60 mm.

As shown in FIG. 2A, the strip-shaped member 3 formed as described above is spirally wound along the inner circumference of the existing pipe 1 between the manholes 4 to form a spiral tubular rehabilitation pipe. It becomes 2. As shown in FIG. 2B, in the rehabilitation pipe 2, the fitting portions 13 and 14 adjacent to each other are fitted in an uneven manner.

A backfill filling space 5 is formed between the existing pipe 1 and the rehabilitation pipe 2. The backfill filling space 5 includes an inter-pipe space portion 5a, a step space portion 5b, and a concave groove space portion 5c. The space between the inner peripheral surface of the existing pipe 1 and the outer peripheral side plate 25 is the inter-pipe space portion 5a. The step space portion 5b is formed between the adjacent winding portions of the body portion 21 due to the height difference along the inner and outer directions (vertical direction in FIG. 2B) between the outer peripheral side plate 25 and the fitting portion 13. The step space portion 5b is integrally connected to the inter-pipe space portion 5a. The width W ₁ of the step space portion 5b is equal to the distance between the adjacent winding portions of the body portion 21, and is preferably about W ₁ = 20 mm to 200 mm. Further, the height of the step space portion 5b is equal to the protruding height H of the body portion 21, and is preferably about 5 mm to 60 mm.
The concave groove space portion 5c is formed by the shoulder portion 22, the arm portion 23, and the base wall portion 26. The concave groove space portion 5c is opened to the outer peripheral side and is integrally connected to the step space portion 5b.

As shown in FIG. 2B, the outer surface of the inclined wall portion 27 (anchor acting portion) is an anchor acting surface 27a facing the step space portion 5b of the backfill filling space 5. The anchor working surface 27a is tilted toward the inner peripheral side by an angle α ₂₇ with respect to the surface of the rehabilitation tube 2 orthogonal to the tube axis L ₂ . Preferably, the tilt angle α ₂₇ is α ₂₇ = approximately 0 ° to 30 °.

As shown in FIG. 2B, the backfill filling space 5 is filled with the backfill material 6. The composite pipe M is constructed by the existing pipe 1, the backfill material 6, and the rehabilitation pipe 2. The outer surface of the rehabilitation pipe 2 including the anchor working surface 27a is in contact with the backfilling material 6.

When an external force such as a bending moment or vibration is applied to the composite pipe M and the backfill material 6 tries to be displaced toward the outer peripheral side relative to the rehabilitation pipe 2, the inclined wall portion 27 (anchor acting portion) is backed. It is locked to the filling material 6 from the outer peripheral side. As a result, the anchor effect works, the interface peeling between the backfill material 6 and the rehabilitation pipe 2 is suppressed, and cracks can be prevented from entering the backfill material 6. Further, since the inclined wall portion 27 is arranged so as to project toward the outer peripheral side from the main band member 10, the inclined wall portion 27 and the backfilling material 6 can be firmly caught. As a result, the integration of the existing pipe 1, the backfill material 6, and the rehabilitation pipe 2 is enhanced, and the performance as the composite pipe M can be reliably maintained.
By holding the reinforcing strip 20 from the inside of the body portion 21 by the T rib 15 (reinforcing strip holding portion), it is possible to prevent the reinforcing strip 20 from coming off from the main strip 10. As a result, the anchor effect can be reliably expressed and the integrated performance can be maintained.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings for configurations that overlap with the above-described embodiments, and the description thereof will be omitted.
<Second Embodiment>
FIG. 3 shows a second embodiment of the present invention. In the band-shaped member 3B of the second embodiment, only one T-rib 15 is provided at the center of the flat band portion 11 in the width direction. The body portion 21 of the reinforcing strip 20B has a width smaller than that of the first embodiment. A single T-rib 15 is inserted inside the body 21. Both ends of the flange 15f are pressed against the inner surfaces of the pair of side walls 24. As a result, the reinforcing strip 20B is held from the inside of the body portion 21 so as not to come off from the main strip 10.

<Third Embodiment>
FIG. 4 shows a third embodiment of the present invention. In the band-shaped member 3C of the third embodiment, a pair of ribs 18 having a T-shaped cross section (hereinafter referred to as “T ribs 18”) are provided apart from each other in the width direction of the flat band portion 11 of the main band member 19. A fitting receiving portion 12 is formed between these T ribs 18. The reinforcing strip 20C is fitted into the fitting receiving portion 12. A pair of arm portions 23 of the reinforcing strip 20C are locked to the flange of the T-rib 18 and the corner portion of the web.

In the reinforcing strip 20C, almost the entire side wall 24C of the body portion 21 is inclined toward the outer peripheral side (upper side in FIG. 4) toward the side opposite to the other side wall 24C. As a result, almost the entire side wall 24C becomes an inclined wall portion, that is, an anchor acting portion. The entire outer surface of the side wall 24C is an anchor working surface that is tilted toward the inner peripheral side and faces the backfill filling space 5.

The body portion 21 projects toward the outer peripheral side (upper side in FIG. 4) with respect to the T rib 18. As a result, the end portion (upper end portion in FIG. 4) on the outer peripheral side of the side wall 24C (anchor acting portion) protrudes toward the outer peripheral side (upper side in FIG. 4) from the main band member 19. This provides a strong anchor effect.
A female fitting portion 19a is formed at one end of the main strip 19 in the width direction (the left end in FIG. 4). A male fitting portion 19b is formed at the other end of the main strip 19 in the width direction (the right end in FIG. 4). Although not shown, the strip-shaped member 3C is spirally wound and the female fitting portion 19a and the male fitting portion 19b adjacent to each other are fitted one round at a time during pipe making.

<Fourth Embodiment>
FIG. 5 shows a fourth embodiment of the present invention. In the strip-shaped member 3D of the fourth embodiment, the body portion 21 of the reinforcing strip member 20D has a lower protrusion height than the T-rib 18. The entire side wall 24D serving as the anchor acting portion is recessed and arranged on the inner peripheral side (lower side in FIG. 5) from the outer peripheral side end portion of the main band member 19.

<Fifth Embodiment>
FIG. 6 shows a fifth embodiment of the present invention. In the band-shaped member 3E of the fifth embodiment, the body portion 21 of the reinforcing band member 20E includes a pair of side walls 24E and a circular top 28. The pair of side walls 24E are inclined so as to be closer to each other toward the outer peripheral side (upper side in FIG. 6). The pair of side walls 24E may be upright. A circular top 28 having a circular cross section is provided between the outer peripheral ends (upper end in FIG. 6) of the side wall 24E. The diameter of the circular top 28 is larger than the distance between the outer peripheral ends of the side wall 24E.
The circular top 28 protrudes from the main strip 19 toward the outer peripheral side (upper side in FIG. 6).

The outer surface 28b of the half portion 28a on the side wall 24E side (lower side in FIG. 6) of the circular top portion 28 faces the backfill filling space 5 and is inclined toward the inner peripheral side (lower side in FIG. 6) or inside. It is directed to the circumferential side and serves as an anchoring surface. The half portion 28a of the circular top portion 28 is an anchor acting portion that can be locked to the backfill material 6 (see FIG. 2B) of the backfill filling space 5 from the outer peripheral side.

<Sixth Embodiment>
FIG. 7 shows a sixth embodiment of the present invention. In the band-shaped member 3F of the sixth embodiment, the shavings 29 are provided on the pair of arm parts 23 of the reinforcing band 20F, respectively. The maple portion 29 is projected from the outer peripheral end portion (upper end portion in FIG. 7) of the arm portion 23 toward the other arm portion 23.

The inner peripheral side surface 29a (lower surface in FIG. 7) of the maple portion 29 is directed to the inner peripheral side (lower side in FIG. 7) and faces the backfill filling space 5 to serve as an anchor working surface. The maple portion 29 is an anchor acting portion that can be locked to the backfill material 6 (see FIG. 2B) of the backfill filling space 5 from the outer peripheral side.
The pair of side walls 24F of the reinforcing strip 20F is an upright wall that runs straight along the inside and outside directions (upper and lower in FIG. 7) as a whole.

<7th Embodiment>
FIG. 8 shows a seventh embodiment of the present invention. In the strip-shaped member 3G of the seventh embodiment, a T-rib 30 is provided at the center of the flat inner peripheral side plate 22G of the reinforcing strip 20G in the width direction in place of the body portion. The T-rib 30 is made of T-shaped steel having a web plate 31 and a flange plate 32. The web plate 31 is abutted against the outer peripheral side surface (upper surface in FIG. 8) of the inner peripheral side plate 22G so as to be orthogonal to the inner peripheral side plate 22G, and is joined by welding or the like. The flange plate 32 is connected so as to be orthogonal to the outer peripheral end portion (upper end portion in FIG. 8) of the web plate 31.

In the flange plate 32, the inner peripheral side surfaces 32a (lower surface in FIG. 8) on both sides of the web plate 31 are directed to the inner peripheral side (lower side in FIG. 8) and face the backfill filling space 5 to act as an anchor. It is a face. The flange plate 32 is an anchor acting portion that can be locked to the backfill material 6 (see FIG. 2B) of the backfill filling space 5 from the outer peripheral side.
The T-rib 30 has a lower protruding height than the T-rib 18, and the flange plate 32 serving as an anchor acting portion is retracted to the inner peripheral side (lower side in FIG. 8) of the outer peripheral side end portion of the main strip material 19. Have been placed. The T-rib 30 may be projected toward the outer peripheral side of the T-rib 18, and the flange plate 32 may be arranged on the outer peripheral side (upper side in FIG. 8) of the main band member 19.

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, a hole may be formed in the body portion 21 of the reinforcing members 20, 20B to 20E. The backfilling material 6 may enter the inside of the body portion 21 (and thus the space between the reinforcing member and the main band member) through the hole portion to exhibit the anchor effect.
An anchor acting portion may be provided on only one of the pair of side walls of the body portion 21.
The length of one strip-shaped member for forming a spiral tube is usually several tens of meters to several hundreds of meters, but one strip-shaped member is a segment (short strip-shaped) having a length of about several tens of centimeters to several meters. You may. A plurality of the segments may be connected to form a ring, and a plurality of rings may be arranged in the axial direction to form a rehabilitation tube.

The present invention can be applied to, for example, rehabilitation work of an aged sewer pipe.

M Composite pipe L ₂ Pipe shaft 1 Existing pipe 2 Rehabilitation pipe 3 Band-shaped member 3B to 3G Band-shaped member 5 Backfill filling space 6 Backfill material 10 Main band material 12 Fitting receiving part 15 Rib (reinforcing band holding part)
19 Main strip 20 Reinforcing strip 20B to 20G Reinforcing strip 21 Body 24 Side wall 24C, 24D Side wall (sloping wall part, anchor acting part)
26 Base wall part 27 Inclined wall part (anchor action part)
27a outer surface (anchor action surface)
28 Circular top 28a Half part (anchor action part)
28b outer surface (anchor action surface)
29 Kaesi part (anchor action part)
29a Inner peripheral side surface (anchor action surface)
30 T-rib 32 Flange plate (anchor working part)
32a Inner peripheral side surface (anchor action surface)

Claims (5)

A strip-shaped member that is spirally wound along the inner circumference of an existing pipe through a backfill filling space to form a spiral tubular rehabilitation pipe.
A main band made of synthetic resin having a fitting receiving portion open to the outer peripheral side,
A reinforcing band material provided on the outer peripheral side of the main band material is provided.
The reinforcing strip includes an anchoring portion having an anchoring working surface facing the backfill filling space, and the anchoring working surface is tilted toward the inner peripheral side.
The reinforcing strip includes a body portion that is convex toward the outer peripheral side, and a pair of side walls of the body portion has an inclined wall portion that is inclined to the opposite side toward the outer peripheral side.
A strip-shaped member characterized in that the inclined wall portion projects toward the outer peripheral side from the main strip member to form the anchor acting portion . The band-shaped member according to claim 1 , wherein the main band member has a reinforcing band holding portion that holds the reinforcing band member from the inside of the body portion. The pair of side walls of the body portion have a base wall portion that is close to each other or is substantially upright from the end portion on the inner peripheral side toward the outer peripheral side, and the inclined wall portion is located on the outer peripheral side of the base wall portion. The strip-shaped member according to claim 1 or 2 , characterized in that they are connected. A pair of ribs are formed on the main strip so as to be separated from each other in the width direction and protrude toward the outer peripheral side, and these ribs are inserted into the inside of the body portion and pressed against the inner surface of the pair of side walls. The strip-shaped member according to any one of claims 1 to 3 , wherein the strip-shaped member is provided. The strip-shaped member according to any one of claims 1 to 4 is spirally wound along the inner circumference of the existing pipe to form a spiral tubular rehabilitation pipe made of the strip-shaped member .
The backfill filling space between the inner circumference of the existing pipe and the rehabilitation pipe is filled with the backfill material, and by extension, on the outer peripheral side of the main band material of the rehabilitation pipe, the adjacent inclined walls of the winding portions face each other. A method for rehabilitating an existing pipe, which comprises filling a backfill material in a stepped space that narrows toward the outer peripheral side between the portions .

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