JP2023047551A - Pipe rehabilitation structure and existing pipe rehabilitating method, and regulator for pipe rehabilitation - Google Patents

Abstract

To provide a pipe rehabilitation structure whereby: when an earthquake load or the like causes a concentrated deformation at a predetermined site of an existing pipe, a flexible part of a rehabilitated pipe is prevented from locally suffering a great deformation to be broken.SOLUTION: The inner periphery of a degraded existing pipe 1 is lined with a spiral rehabilitated pipe 3 composed of a band-like member 10 having a flexible part 15. A clearance 1c between the existing pipe 1 and the rehabilitated pipe 3 includes a regulator 20. The regulator 20 includes a straddling part 23 that straddles the flexible part 15 in a pipe axis direction. The straddling part 23 regulates the amount of elongation of the flexible part 15.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present invention relates to a pipe rehabilitation structure and an existing pipe rehabilitation method for rehabilitating an existing pipe such as a sewage pipe, and a regulation member for pipe rehabilitation used therein, and in particular, to a helical tubular structure made of a band-shaped member having an expandable portion such as a bellows. It relates to a pipe rehabilitation structure etc. in which the rehabilitation pipe is lined on the inner circumference of the existing pipe.

A method of rehabilitating an existing pipe such as an aged sewer pipe by spirally winding a band-shaped member along the inner circumference of the existing pipe to construct a spiral rehabilitating pipe is known (Patent Document 1: , 2 etc.). For example, the belt-shaped member of Patent Document 1 is provided with a bellows that can expand and contract in the width direction of the belt. The expansion and contraction of the bellows makes it possible to release the large load during an earthquake.

Existing pipes, such as sewage pipes, which are buried underground, generally have a structure in which pipe bodies of a certain length, such as Hume pipes, are arranged in a row. Each tube has a socket at one end and a spigot at the other end. These tubular bodies are connected by inserting the socket of one of the adjacent tubular bodies into the socket of the other.

JP 2018-065351 A JP 2019-181789 A

In a rehabilitated existing pipe lined with a belt-shaped member with an expandable portion such as the bellows, displacement during an earthquake may concentrate at a predetermined location. Then, in the rehabilitating pipe, only the expandable/contractible portion in the vicinity of the displacement concentrated portion among the expandable/contractible portions is greatly elongated and deformed. For example, in a structure in which existing pipes are arranged in a row, the displacement during an earthquake concentrates on the joints between adjacent pipes, causing local expansion and contraction of only the peripheral parts of the joints. become. If the displacement becomes excessive and exceeds the allowable elongation amount, there is a risk that the expansion/contraction portion near the displacement concentrated portion will be broken.
In view of such circumstances, the present invention has been made in view of the fact that when a predetermined portion of an existing pipe is intensively displaced due to an earthquake load or the like, the expansion/contraction portion of the rehabilitating pipe in the vicinity of the displacement concentrated portion is locally greatly deformed and broken. The purpose is to prevent

In order to solve the above-mentioned problems, the pipe rehabilitation structure according to the present invention is a helical tubular structure made of a band-shaped member that has an expandable and contractable part that can be expanded and contracted in the band width direction and is spirally wound along the inner circumference of an existing pipe. and the rehabilitation pipe of
a regulating member that is disposed in an inter-pipe gap between the existing pipe and the rehabilitated pipe and includes a straddle portion that straddles the stretchable portion in the pipe axial direction, the straddling portion regulating an amount of expansion of the stretchable portion;
characterized by comprising

It is preferable that the regulating member is provided at least at a portion of the existing pipe where concentrated displacement is likely to occur due to an earthquake load or the like (displacement concentrated portion).
When such concentrated displacement occurs, among the expansion-contraction portions of the rehabilitation pipe, expansion-contraction portions in the vicinity of the displacement-concentrated portions are locally expanded and contracted largely. When the stretchable portion stretches and deforms until it abuts against both sides of the straddling portion of the regulating member, further stretch deformation is stopped. Therefore, the load is distributed to the periphery, and the expansion/contraction portion is elongated and deformed over a wide area of the rehabilitating pipe. As a result, the load can be absorbed in a wide range of the rehabilitating pipe, and it is possible to prevent the expansion and contraction portion near the displacement concentrated portion from being broken.

The regulating member sandwiches a spacer portion intersecting with the expandable portion and extending in the pipe axial direction and interposed between the existing pipe and the rehabilitated pipe, and a crossing portion of the spacer portion with the expandable portion. and a pair of projections projecting from both sides toward the rehabilitation pipe, and the crossing portion and the pair of projections constitute the straddle portion.
The expandable portion is arranged so as to be sandwiched between the pair of projections. As a result, it is possible to reliably prevent the extensible portion from being excessively elongated and deformed by an earthquake load or the like. The maximum extendable amount of the extendable portion can be set by the distance between the pair of projections. The distance between the pair of projections is equal to or less than the allowable elongation amount immediately before the elastic portion is excessively elongated and broken.
By interposing the spacer portion between the existing pipe and the rehabilitated pipe, the size of the gap between the existing pipe and the rehabilitated pipe or the gap between the pipes can be maintained.

It is preferable that the expandable portion includes a bellows that bulges out toward the outer periphery of the rehabilitating pipe and can expand and contract in the direction of the pipe axis, and that the bellows is inserted inside the straddle portion.
The expansion and contraction of the bellows can absorb an earthquake load. When both ends of the bellows are elongated and deformed until they abut against both sides of the straddle portion, further expansion of the bellows is restricted.

The existing pipe is composed of a plurality of tubular bodies arranged in a row,
The expansion and contraction part extends spirally over the entire area of the rehabilitation pipe,
It is preferable that the straddling portion is arranged so as to straddle at least an expandable portion of the expandable portion that is arranged near a connection portion between the adjacent tubular bodies.
During an earthquake, the adjacent tubular bodies of the existing pipe are displaced relative to each other, so that a load is applied to the expandable portion near the connecting portion, and the expandable portion is deformed. By restricting the stretching deformation of the stretchable portion by the straddle portion of the regulating member, the stretchable portion of the rehabilitating pipe is stretched and deformed over a wide range. As a result, the load can be distributed and absorbed over a wide area of the rehabilitating pipe.

It is preferable that the regulating member is embedded in a back-filling material filled in the inter-pipe gap. As a result, the regulating member can be stably arranged in the inter-pipe gap. The existing pipe and the rehabilitated pipe are structurally integrated through the backfilling material, and the load can be widely distributed.

The method of the present invention is a method for rehabilitating an existing pipe, in which a helical rehabilitated pipe is produced by spirally winding a band-shaped member having an expandable portion that can be expanded and contracted in the direction of the width of the existing pipe along the inner circumference of the existing pipe. in
a step of arranging a regulating member including a straddle portion on the inner peripheral surface of the existing pipe before or during pipe production;
a step of adjusting the straddling portion to straddle the stretchable portion in the pipe axial direction during pipe production;
characterized by comprising
By manufacturing the rehabilitated pipe, the regulating member is arranged in the inter-pipe gap between the existing pipe and the rehabilitated pipe.
The bridging part straddles the expandable part in the pipe axis direction, thereby restricting the amount of expansion of the expandable part due to an earthquake load or the like. As a result, the load can be distributed over a wide area of the rehabilitating pipe, and local breakage of the stretchable portion can be prevented.

Further, the present invention provides a helical pipe-shaped rehabilitated pipe made of a band-shaped member that has an expandable and contractable portion that can be expanded and contracted in the band width direction and is spirally wound along the inner circumference of the existing pipe, and the existing pipe. A pipe rehabilitation restricting member arranged in the inter-pipe gap of
It is characterized by including a straddle portion that straddles the expandable portion in the pipe axis direction, and that the expansion amount of the expandable portion is regulated by arranging the expandable portion inside the straddle portion.
The pipe rehabilitation restricting member includes a spacer portion that intersects the expandable portion and extends in the pipe axial direction and is interposed between the existing pipe and the rehabilitation pipe, and an intersection of the expandable portion in the spacer portion. It is preferable that the crossing portion and the pair of projections constitute the straddle portion.

It is preferable that an uneven pattern is formed on the outer peripheral surface of the spacer portion.
This configuration is particularly effective when filling the inter-pipe gap with the back-filling material. The back-filling material has the effect of structurally integrating the existing pipe and the rehabilitated pipe to form a composite pipe. On the other hand, if there is a spacer portion in the gap between the pipes, there is a risk that the integration effect will be impaired. On the other hand, since the fixability between the spacer portion and the back-filling material is enhanced by the concave-convex pattern, it is possible to prevent the integration effect from being impaired.

According to the present invention, in a pipe rehabilitation structure, when a predetermined portion of an existing pipe is intensively displaced due to an earthquake load or the like, the expansion-contraction portion of the rehabilitation pipe near the displacement-concentrated portion locally deforms greatly. can prevent As a result, breakage of the stretchable portion can be prevented. Furthermore, the load can be distributed and absorbed over a wide area of the rehabilitated pipe.

FIG. 1 is a side view of a pipe rehabilitation structure according to a first embodiment of the present invention. 2 is a front cross-sectional view of the pipe rehabilitation structure along line II-II of FIG. 1. FIG. FIG. 3(a) is a cross-sectional view showing a belt-like member constituting a rehabilitation pipe of the pipe rehabilitation structure in a state in which the bellows thereof is not deformed by expansion and contraction. FIG. 3(b) is a cross-sectional view showing the belt-shaped member with the bellows stretched and deformed. FIG. 4 is an enlarged cross-sectional view of circular portion IV of FIG. 5 is a side view of the restricting member shown in FIG. 4; FIG. FIG. 6 is a side cross-sectional view of a pipe rehabilitation structure in a state of being displaced by an earthquake load. FIG. 7 is a cross-sectional view showing an enlarged portion of concentrated displacement in FIG. FIG. 8 is a front cross-sectional view of a pipe rehabilitation structure according to a second embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
<First embodiment>
FIG. 1 shows a pipe rehabilitation structure 1. As shown in FIG. A pipe rehabilitation structure 1 includes an existing pipe 2 , a rehabilitation pipe 3 , and a backfilling material 4 . The existing pipe 2 is, for example, a sewage pipe buried underground. Note that the existing pipe 2 is not limited to a sewage pipe, and may be a water supply pipe, an agricultural water pipe, a hydroelectric power transmission pipe, a gas pipe, a tunnel, or the like.

As shown in FIG. 1, the existing pipe 2 is constructed by connecting a plurality of pipe bodies 2a in a row. As the tubular body 2a, for example, a Hume tube of a certain length is used. A socket 2b is provided at one end of each tubular body 2a, and a spigot 2d is provided at the other end. These tubular bodies 2a are connected by inserting the other socket 2d into the socket 2b of one of the adjacent tubular bodies 2a. A connection portion 2c is configured by the socket 2b and the receptacle 2d that are fitted to each other. The connecting portion 2c is a portion of the existing pipe 1 where concentrated displacement is likely to occur due to an earthquake load or the like (displacement concentration portion).

As shown in FIGS. 1 and 2, the inner peripheral surface of an existing pipe 2 that has deteriorated is lined with a rehabilitation pipe 3 . The inter-pipe gap 1c between the existing pipe 2 and the rehabilitation pipe 3 is filled with a back-filling material 4 such as mortar. As a result, a pipe rehabilitation structure 1 composed of a composite pipe in which the existing pipe 2 and the rehabilitation pipe 3 are structurally integrated via the backfilling material 4 is constructed.

The rehabilitation pipe 3 is a helical pipe formed by spirally winding a belt-like member 10 . As shown in FIG. 3A, the strip member 10 includes a strip plate portion 11, fitting portions 13 and 14, a bellows 15 (extendable portion), and ribs 16, and is formed to have a constant irregular cross section. , extending in the band length direction (the direction orthogonal to the paper surface in FIG. 3(a)). The material of the belt-shaped member 10 is, for example, a synthetic resin such as polyvinyl chloride. The band plate portion 11 includes a first band plate portion 11a on one end side in the band width direction (left in FIG. 3A) and a second band portion 11a on the other end side in the band width direction (right in FIG. 3A). plate portion 11b. A step 11d is formed between the strip portions 11a and 11b. The band plate portion 11a is displaced from the band plate portion 11b to the outer peripheral side (the side facing the outer periphery when the rehabilitating pipe 3 is manufactured, the upper side in FIG. 3(a)). A first fitting portion 13 having an uneven cross section is provided at an end portion of the band plate portion 11a.

A bellows 15 is formed in the intermediate portion of the band plate portion 11a. The bellows 15 is formed to have a U-shaped cross section, for example, so that it bulges out toward the outer periphery and is recessed when viewed from the inner periphery (lower side in FIG. 3A). As shown in FIGS. 3(a) and 3(b), the bellows 15 can be expanded and contracted in the band width direction.

A second fitting portion 14 having an uneven cross-sectional shape complementary to the first fitting portion 13 is provided on the outer peripheral side surface of the band plate portion 11b. The band plate portion 11b extends from the second fitting portion 14 to the other end side in the band width direction (to the right in FIG. 3) to constitute an extension band portion 11e. The band plate portion 11 from the bellows 15 to the second fitting portion 14 is formed with a rib 16 having a T-shaped cross section and protruding to the outer peripheral side.

As shown in FIG. 4, in the pipe rehabilitation structure 1, the band-shaped member 10 is spirally wound along the inner peripheral surface of the existing pipe 2, and the fitting portions 13 and 14 are fitted to each other. By doing so, a helical rehabilitated pipe 3 is produced. The extending band portion 11e of the second band plate portion 11b is superimposed on the inner peripheral side surface (lower surface in FIG. 4) of the first band plate portion 11a. The extending band portion 11e closes the opening of the bellows 15 to the inner peripheral side and fills the step 11d. The inner peripheral surface of the rehabilitating pipe 3 is a smooth surface without steps.
As shown in FIG. 1 , the bellows 15 spirally extends over the entire area of the rehabilitation pipe 3 .

As shown in FIGS. 1 and 2 , a plurality of regulation members 20 for pipe rehabilitation are installed in the inter-pipe gap 1 c of the pipe rehabilitation structure 1 . The material of the regulating member 20 may be metal such as steel, iron, stainless steel, or hard resin. As shown in FIG. 5, each regulating member 20 includes a spacer portion 21 and a pair of projections 22. As shown in FIG. The spacer portion 21 is formed in the shape of a straight bar or reinforcing bar. As shown in FIG. 4, the length of the spacer portion 21 is equal to or slightly smaller than the helical pitch of the rehabilitating pipe 3 when the bellows 15 is not stretched or contracted. The cross-sectional shape of the spacer portion 21 is circular, but is not limited to this, and may be polygonal such as quadrangular. The spacer portion 21 may be flat as long as it can be arranged in the inter-pipe gap 1c.

A pair of protrusions 22 are provided on the peripheral side portion of the spacer portion 21 closer to one end than the middle portion. The protrusion 22 protrudes from the spacer portion 21 so as to be perpendicular to the spacer portion 21 . The pair of protrusions 22 are parallel to each other and are spaced apart in the longitudinal direction of the spacer portion 21 .

An uneven pattern 24 is formed on the outer peripheral surface of the regulation member 20 including the spacer portion 21 and the projections 22 . The concave-convex pattern 24 is, for example, mesh-like or twill-like. The uneven pattern 24 may be a ridge projected from the outer peripheral surface of the spacer portion 21, a groove recessed from the outer peripheral surface of the spacer portion 21, or a knurl.

As shown in FIGS. 1 and 2 , in the pipe rehabilitation structure 1 , a plurality of restricting members 20 are arranged on the outer periphery of the rehabilitation pipe 3 so as to be distributed in the pipe axial direction and the pipe circumferential direction. As shown in FIG. 2, in this embodiment, the regulating members 20 are arranged in the inter-pipe gap 1c in the upper half of the rehabilitating pipe 3 at intervals in the pipe circumferential direction. The extending direction of the spacer portion 21 of each regulating member 20 is oriented in the axial direction of the rehabilitating pipe 3 (the direction perpendicular to the plane of FIG. 2). As shown in FIGS. 1 and 4, the regulating members 20 at each position in the pipe circumferential direction are arranged in a straight line.
Each regulating member 20 is not fixed to the rehabilitation pipe 3 and is free. These regulating members 20 are embedded and fixed in the back-filling material 4 in the inter-pipe gap 1c.

A spacer portion 21 is interposed between the existing pipe 2 and the rehabilitating pipe 3 in the upper half of the pipe rehabilitating structure 1 , thereby maintaining the distance between the existing pipe 2 and the rehabilitating pipe 3 . The bottom of the rehabilitation pipe 3 is attached to the bottom of the existing pipe 2 (Fig. 2).

As shown in FIG. 4, a portion 21c (crossing portion) between the pair of projections 22 in the spacer portion 21 of each regulating member 20 covers the outer peripheral side of the bellows 15 and crosses the bellows 15. there is A pair of protrusions 22 protrude toward the rehabilitation pipe 3 from both sides of the intersection 21c. A straddle portion 23 is formed by the crossing portion 21 c and the pair of projections 22 of the restricting member 20 . The bridging portion 23 straddles the bellows 15 in the axial direction of the rehabilitating pipe 3 . The crossing portion 21 c and the pair of protrusions 22 form a crossing concave portion 23 c in the crossing portion 23 . A bellows 15 is inserted into the straddling recess 23c. A bellows 15 is arranged so as to be sandwiched between the pair of projections 22 . The pair of protrusions 22 define both sides of the straddling recess 23c.

As shown in FIG. 7 , the stretch of the bellows 15 is regulated by the straddle portion 23 . The distance between the pair of protrusions 22 is the maximum extendable amount of the bellows 15 . The separation distance, that is, the maximum stretchable amount is smaller than the allowable stretch amount (stretch amount at break) of the bellows 15 .
The regulating member 20 may be provided at least at the connection portion 2c or in the vicinity thereof. The straddle portion 23 may be arranged so as to straddle at least the bellows portion 15a (extendable portion) in the vicinity of or near the connection portion 2c of the bellows 15. As shown in FIG.

<How to rehabilitate existing pipes>
At the time of rehabilitation work for the old existing pipe 1, the restricting member 20 is temporarily fixed by a U-shaped anchor or the like (Fig. not shown). After that, by lining the rehabilitating pipe 3 , the restricting member 20 is sandwiched between the existing pipe and the rehabilitating pipe 3 . As a result, the regulating member 20 is arranged in the inter-pipe gap 1c.
During the temporary fixing, the projections 22 may be directed in the circumferential direction of the existing pipe 2, and the regulation member 20 may be rotated approximately 90 degrees during or after lining to direct the projections 22 toward the inner circumference of the pipe. .
Further, the position and orientation of the regulating member 20 are adjusted so that the bridging portion 23 straddles the bellows 15 in the pipe axis direction.
The temporary fixing step may be omitted. In parallel with the lining of the rehabilitating pipe 3 , a restricting member 20 may be inserted between the rehabilitating pipe 3 during lining (during pipe production) and the inner peripheral surface of the existing pipe 1 .
After the rehabilitated pipe 3 is made to have a slightly smaller diameter and the restricting member 20 is inserted into the inter-pipe gap 1c, the diameter of the rehabilitated pipe 3 may be expanded.

After lining the rehabilitating pipe 3, a back-filling material 4 is filled in the inter-pipe gap 1c. Thereby, the regulation member 20 is embedded in the backfilling material 4 . Therefore, the regulating member 20 can be stably arranged in the inter-tube gap 1c. In addition, the concave-convex pattern 24 enhances the fixing strength of the spacer portion 21 to the backfilling material 4 . Therefore, even if the spacer portion 21 is present in the inter-pipe gap 1c, it is possible to prevent the function of integrating the existing pipe 1 and the rehabilitating pipe 3 by the back-filling material 4 from being impaired.
In this way, the old existing pipe 2 is rehabilitated and the pipe rehabilitation structure 1 is constructed.

In the pipe rehabilitation structure 1, the load due to an earthquake or the like can be relieved by expanding and contracting the bellows 15.
Specifically, as shown in FIG. 6, when a load due to an earthquake or the like is applied to the existing pipe 1, the adjacent pipe bodies 2a are displaced relative to each other, and the displacement concentrates particularly on the connecting portion 2c (predetermined location). Cheap. Therefore, in the rehabilitating pipe 3, the bellows portion 15a of the spiral bellows 15, especially near the connecting portion 2c, is greatly expanded and deformed locally.
As shown in FIG. 7, when the bellows portion 15a is greatly extended, both ends of the bellows portion 15a abut against the pair of protrusions 22 of the straddle portion 23 of the corresponding restricting member 20A. Therefore, the bellows portion 15a is prevented from being stretched and deformed any further. As a result, it is possible to prevent the bellows portion 15a near the connection portion 2c (displacement concentrated portion) from being excessively stretched and broken.

As shown in FIG. 6, since deformation of the bellows portion 15a near the connecting portion 2c is restrained by the corresponding restricting member 20A, the load is dispersed and the bellows 15 extends over a wide range of the rehabilitating pipe 3. Transformed. Preferably, the elongation deformation is propagated over a plurality of pitches of the spiral bellows 15 with the bellows portion 15a as the center. As a result, the load can be absorbed by the portions of the helical rehabilitation pipe 3 extending over a plurality of pitches. When the bellows 15 is extended to the maximum extendable amount even at a portion apart from the connecting portion 2c, the corresponding restricting member 20 can restrict further extension. When the bellows 15 in the upper half of the rehabilitating pipe 3 is restrained by the restricting member 20, the restraining force is also applied to the lower half, and the extension of the bellows 15 in the lower half is suppressed.
As a result, it is possible to reliably prevent the bellows 15 of the rehabilitating pipe 3 from breaking due to a load such as an earthquake.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings to duplicate the configurations already described, and the description thereof will be omitted.
<Second Embodiment (FIG. 8)>
FIG. 8 shows a second embodiment of the invention. In the second embodiment, the restricting members 20 are arranged not only on the upper half of the outer circumference of the rehabilitating pipe 3 but also on the lower half thereof, so that they are arranged at intervals over the entire outer circumference of the rehabilitating pipe 3. ing. The bottom portion of the rehabilitating pipe 3 is lifted from the bottom portion of the existing pipe 1 by the spacer portion 21 of the regulating member 20 arranged in the lower half portion. Preferably, the rehabilitation pipe 3 is arranged so as to form a substantially concentric circle with the existing pipe 1 .

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.
For example, the regulating member 20 may be arranged only on the lower half of the outer circumference of the rehabilitation pipe 3, or may be arranged only on both left and right sides.
The stretchable portion of the belt-shaped member does not necessarily have to be configured with bellows. The strip-shaped member may not have bellows. The fitting portions 13 and 14 of the strip-shaped member 10 of the rehabilitating pipe 3 may be displaceable or deformable in the pipe axial direction (band width direction) due to the clearance between them or their elasticity. , and the fitting portions 13 and 14 may constitute an “extension portion”. The straddle portion 23 of the regulating member 20 may be arranged so as to straddle the stretchable portion composed of the fitting portions 13 and 14 .
The backfilling material 4 may be omitted. The rehabilitating pipe 3 may constitute a self-supporting pipe that alone bears the required strength.
The rehabilitation pipe 3 may have a double spiral structure including a wide belt-like member (strip) and a narrow belt-like member (joiner). A stretchable part such as a bellows may be formed on one of the belt-shaped members.

INDUSTRIAL APPLICABILITY The present invention can be applied, for example, to rehabilitation technology for aging sewage pipes.

1 Pipe rehabilitation structure 1c Gap between pipes 2 Existing pipe 2a Pipe body 2b Socket 2c Connection portion (place of concentration of displacement)
2d spigot 3 rehabilitating pipe 4 back-filling material 10 belt-like member 11 band plate portion 11a band plate portion 11b band plate portion 11d step 11e extending band portion 13 first fitting portion 14 second fitting portion 15 bellows (expandable portion)
15a bellows part (expansion part) in the immediate vicinity of the connection part
16 Rib 20 Regulating member 20A Corresponding regulating member Connection portion 21 Spacer portion 21c Crossing portion 22 Projection 23 Straddle portion 24 Concavo-convex pattern

Claims (9)

a helical rehabilitating pipe made of a belt-shaped member that has an expandable and contractable portion that can be expanded and contracted in the band width direction and that is spirally wound along the inner circumference of the existing pipe;
a regulating member that is disposed in an inter-pipe gap between the existing pipe and the rehabilitated pipe and includes a straddle portion that straddles the stretchable portion in the pipe axial direction, the straddling portion regulating an amount of expansion of the stretchable portion;
A pipe rehabilitation structure comprising: The regulating member sandwiches a spacer portion intersecting with the expandable portion and extending in the pipe axial direction and interposed between the existing pipe and the rehabilitated pipe, and a crossing portion of the expandable portion of the spacer portion. 2. The pipe rehabilitation structure according to claim 1, further comprising a pair of projections projecting from both sides toward the rehabilitation pipe side, and the crossing portion and the pair of projections constitute the straddle portion. . 2. The expandable portion includes a bellows that bulges out toward the outer periphery of the rehabilitating pipe and expands and contracts in the direction of the pipe axis, and the bellows is inserted inside the straddle portion. Or the pipe rehabilitation structure according to 2. The existing pipe is composed of a plurality of tubular bodies arranged in a row,
The expansion and contraction part extends spirally over the entire area of the rehabilitation pipe,
4. The straddling portion is arranged so as to straddle at least a stretchable portion of the stretchable portion that is arranged in the immediate vicinity of a connecting portion between the adjacent tubular bodies. The pipe rehabilitation structure according to item 1. The pipe rehabilitation structure according to any one of claims 1 to 4, wherein the regulating member is embedded in a back-filling material filled in the inter-pipe gap. In a method for rehabilitating an existing pipe, a band-shaped member having an expandable and contractable portion that can be expanded and contracted in the band width direction is spirally wound along the inner circumference of the existing pipe to manufacture a helical rehabilitated pipe,
a step of arranging a regulating member including a straddle portion on the inner peripheral surface of the existing pipe before or during pipe production;
a step of adjusting the straddling portion to straddle the stretchable portion in the pipe axial direction during pipe production;
An existing pipe rehabilitation method comprising: Arranged in the inter-pipe gap between the existing pipe and a helical pipe-shaped rehabilitated pipe made of a band-shaped member spirally wound along the inner circumference of the existing pipe and having an expandable part that can be expanded and contracted in the band width direction A pipe rehabilitation regulating member that is
A regulating member for pipe rehabilitation, comprising a straddle portion that straddles the stretchable portion in the pipe axial direction, and the stretchable portion is arranged inside the straddle portion to regulate an amount of elongation of the stretchable portion. . A spacer section that intersects with the expandable section and extends in the pipe axis direction and is interposed between the existing pipe and the rehabilitated pipe, and a rehabilitated pipe from both sides across the intersection of the expandable section in the spacer section with the expandable section. 8. The restricting member for pipe rehabilitation according to claim 7, further comprising a pair of projections protruding to the side, wherein the crossing portion and the pair of projections constitute the straddle portion. The restricting member for pipe rehabilitation according to claim 7 or 8, wherein an uneven pattern is formed on the outer peripheral surface of the spacer portion.

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