JP7211897B2 - Rehabilitation method and structure for existing tubular body - Google Patents

Description

The present invention relates to a method and structure for rehabilitating existing tubular bodies such as sewer pipes and tunnels, and in particular to existing spiral tubular rehabilitative pipes consisting of strip-shaped members including synthetic resin main strips and metal reinforcement strips. The present invention relates to a rehabilitation method and a rehabilitation structure by lining the inner wall of a tubular body.

A method of rehabilitating an existing pipe such as an aged sewer pipe by lining the inner wall of the existing pipe is known (see Patent Documents 1 and 2, etc.). For example, a rehabilitating pipe is composed of a belt-like member (profile) with a constant cross section. The strip members include a main strip made of synthetic resin such as polyvinyl chloride (PVC) and a reinforcing strip made of metal such as steel. For example, by using a self-propelled pipe-making machine, the band-shaped member is spirally wound along the inner wall of the existing pipe, and adjacent edge portions that are shifted from each other by one circumference are joined by concave-convex fitting to form a rehabilitating pipe. is produced.

JP 2016-43555 A JP 2017-165079 A

Existing pipes are not necessarily straight in the pipeline direction, and may have bends. When the belt-shaped member is spirally wound along the inner wall of the bent portion to produce a pipe, the spiral pitch on the outer peripheral side is widened. Specifically, in the case of a band-shaped member without an expandable portion, the helical pitch is widened by opening the recess-and-projection fitting portion between the adjacent edges on the outer circumference side. In the case of a belt-like member having a bellows-like stretchable portion (see FIG. 3(b) of Patent Document 1 and FIG. 1 of Patent Document 2, etc.), the stretchable portion on the outer circumference side expands, thereby widening the helical pitch. For this reason, there is a possibility that the degree of placement of the reinforcing strips may vary between the inner circumference and the outer circumference of the bend, and the required strength may not be exhibited on the outer circumference side. In addition, in a portion of the existing pipe that is severely deteriorated, if the pipe is manufactured with a normal helical pitch, there is a possibility that the strength cannot be satisfied.
In view of such circumstances, the present invention aims to secure the required strength of the rehabilitation pipe at the outer circumference of the bend and the strength deterioration portion when the existing tubular body such as sewage pipes and tunnels is to be rehabilitated by the spiral rehabilitation pipe. aim.

In order to solve the above problems, the method of the present invention is a rehabilitation method for rehabilitating an existing tubular body,
a pipe-making step of producing a helical rehabilitated pipe by spirally winding a band-shaped member including a synthetic resin main band and a metal reinforcing band along the inner wall of the existing tubular body;
a removing step of removing the main strip from the strip in the pitch adjustment region set in the rehabilitating pipe;
a pitch adjusting step of reducing the helical pitch of the reinforcing strip left in the pitch adjusting region;
an embedding step of laminating a filler layer on the inner wall of the region of the existing tubular body corresponding to the pitch adjustment region, and burying the remaining reinforcing strip inside the filler layer;
characterized by comprising
In the pitch adjustment region, the strength of the rehabilitating pipe is increased by reducing the helical pitch of the reinforcing strip.
The pipe-making process is preferably performed by a self-propelled pipe-making machine. The self-propelled pipe making machine is arranged at the leading end of the rehabilitating pipe in the extending direction, and is self-propelled (propelled) along with the pipe making.

setting the pitch adjustment region to a bent portion of the pipeline;
Preferably, in the pitch adjusting step, the helical pitch of the remaining reinforcing strip in the outer circumference of the bend is adjusted to be equal to or less than the helical pitch in the non-pitch-adjusted region.
This makes it possible to ensure the required strength of the outer peripheral portion of the bent portion.

setting the pitch adjustment region so as to correspond to the strength deterioration portion of the existing tubular body;
Preferably, in the pitch adjusting step, the spiral pitch of the reinforcing strip left in the pitch adjusting region corresponding to the strength deteriorated portion is made smaller than the spiral pitch in the non-pitch adjusting region.
As a result, the strength-degraded portion can be rehabilitated to ensure the required strength.

When the rehabilitating pipe has been produced by several turns over the pitch adjustment region, the production of the rehabilitating pipe is temporarily stopped and the main strip material in the pitch adjustment region is removed, and then the several turns of the rehabilitating pipe are produced. toward the pitch adjustment area.
As a result, the helical pitch of the reinforcing strip in the pitch adjustment region can be reduced.

The structure of the present invention comprises a helical tubular rehabilitation pipe made up of a belt-shaped member spirally wound along the inner wall of an existing tubular body, the belt-shaped member comprising a main belt made of synthetic resin and a reinforcement made of metal. including strips,
A pitch adjustment area is set in the rehabilitating pipe, and in the pitch adjustment area, only the reinforcing strip is left among the main strip and the reinforcing strip of the strip-shaped member,
and the helical pitch of the retained reinforcing strip is equal to or less than the helical pitch in the non-pitch-adjusted region,
Furthermore, it is characterized in that the remaining reinforcing strip material is buried inside a filler layer laminated on the inner wall of the corresponding area to the pitch adjustment area of the existing tubular body.

According to the present invention, it is possible to ensure the required strength of the helical rehabilitating pipe in the outer circumference of the bend of the existing tubular body, the severely deteriorated portion, and the like.

FIG. 1 shows an embodiment of the present invention, and is a cross-sectional plan view of an existing rehabilitated tubular body (existing tubular body rehabilitation structure). FIG. 2 is a cross-sectional view showing an example of a belt-like member constituting a rehabilitation pipe for rehabilitating the existing tubular body. 3 is a detailed cross-sectional view of circle III of FIG. 1; FIG. FIG. 4 is a cross-sectional plan view showing the existing tubular body under rehabilitation work in a state in which a rehabilitated pipe is produced over a strength-degraded portion. FIG. 5 is a cross-sectional plan view showing the existing tubular body under rehabilitation work, with the main strip material removed from the portion corresponding to the strength deterioration. FIG. 6(a) is a detailed cross-sectional view showing one mode of removing the main strip material from the portion corresponding to strength deterioration of the rehabilitation pipe. FIG. 6(b) is a detailed cross-sectional view showing another aspect of the removal. FIG. 7 is a cross-sectional plan view showing the existing tubular body under rehabilitation work in a state in which the pitch of the reinforcing strips of the portion corresponding to the deterioration of strength is adjusted. FIG. 8 is a cross-sectional plan view showing the existing tubular body under rehabilitation work in a state in which a rehabilitation pipe is produced over a bend. 9 is a detailed cross-sectional view of the circular portion IX of FIG. 8. FIG. FIG. 10 is a cross-sectional plan view showing the existing tubular body under rehabilitation work with the main strip material removed from the bent portion. FIG. 11 is a cross-sectional plan view showing the existing tubular body under rehabilitation work in a state in which the pitch of the reinforcing strips at the bent portion is adjusted. FIG. 12 is a cross-sectional plan view showing the existing tubular body under rehabilitation work in a state where the rehabilitation pipe is manufactured over the entire rehabilitation area. FIG. 13 is a cross-sectional view showing another aspect of the belt-shaped member.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a rehabilitated existing tubular body 1 (existing tubular body rehabilitation structure). The existing tubular body 1 is rehabilitated by lining the rehabilitating pipe 9 along the inner wall 1 b of the old tubular body 1 . The existing tubular body 1 to be rehabilitated is, for example, an underground aged sewage pipe. The existing tubular bodies are not limited to sewage pipes, and may be existing pipes such as water supply pipes, agricultural water pipes, hydroelectric power transmission pipes, gas pipes, dam waterways, or existing tunnels.

The rehabilitation pipe 9 is formed by a belt-like member 10 (profile).
As shown in FIG. 2, the strip member 10 includes a main strip member 11 and a reinforcing strip member 12. As shown in FIG. The main belt member 11 extends long in the belt length direction (perpendicular to the paper surface of FIG. 2), and has a constant cross section perpendicular to the belt length direction. The material of the main strip 11 is a synthetic resin such as polyvinyl chloride. A groove-shaped first fitting portion 13 is formed at the edge of the main strip 11 on one end side (right in FIG. 2) in the strip width direction. A protruding second fitting portion 14 is formed at the edge of the main strip 11 on the other end side (left in the figure) in the strip width direction. Ribs 15 , 16 , 17 having a T-shaped cross section are formed at intermediate portions between the fitting portions 13 , 14 of the main strip 11 .

A reinforcing strip 12 is attached to the rear side portion of the main strip 11 (the outer peripheral portion of the rehabilitation pipe 9, the lower portion in FIG. 2). The material of the reinforcing strip 12 is metal such as steel. The reinforcement strip 12 is formed, for example, to have a W-shaped cross section, and extends parallel to the main strip 11 in the width direction (perpendicular to the plane of FIG. 2). Both ends of the reinforcing strip 12 in the strip width direction are engaged with the tips of the T-shaped ribs 15 and 16 of the main strip 11 . The width dimension W ₁₂ of the reinforcement strip 12 is smaller than the effective width W _{11 of the main strip 11} (the distance between the fitting portions 13 and 14).

As shown in FIG. 1, the belt-like member 10 is spirally wound along the inner wall 1b of the existing tubular body 1 to form a helical rehabilitation pipe 9. As shown in FIG. As shown in FIG. 3, in the rehabilitating pipe 9, fitting portions 13 and 14 of the belt-shaped member 10 wound in a spiral shape are fitted to each other so as to face each other with a one-circumference difference.

The deteriorated existing tubular body 1 may have a strength-deteriorated portion 1d where strength deterioration due to corrosion, cracking, or the like is more severe than other portions.
Moreover, the existing tubular body 1 may have not only the straight portion 1a where the pipeline is straight, but also the curved portion 1c where the pipeline is curved. In this case, the rehabilitation pipe 9 is provided with a straight portion 9a in which the pipeline is straight within the straight portion 1a and a curved portion 9c in which the pipeline is curved within the curved portion 1c.

A portion 9d corresponding to the strength deterioration portion 1d and a bent portion 9c of the rehabilitating pipe 9 are set as a pitch adjustment region. In the pitch adjustment regions 9c and 9d, only the reinforcing strip 12 of the main strip 11 and the reinforcing strip 12 of the strip 10 remains. There is no main strip member 11 in the strip members 10 in the pitch adjustment regions 9c and 9d.
A linear portion 9a of the rehabilitating pipe 9 excluding the portion 9d corresponding to strength deterioration is a non-pitch adjustment region 9a'. The strips 10 of the non-pitch-adjusted region 9a' have main strips 11 and reinforcing strips 12. As shown in FIG. The helical pitch P9a in the pitch non-adjustable region _9a ' is uniquely determined from the effective width W11 of the main strip 11 and the diameter of the rehabilitating pipe 9. As shown in FIG.

The helical pitch of the remaining reinforcing strips 12 in the pitch-adjusted regions 9c, 9d is equal to or less than the helical pitch _P9a of the strip-shaped members 10 in the non-pitch-adjusted regions 9a' of the rehabilitating pipe 9.
Specifically, the helical pitch P _9h of the reinforcing strip 12 in the outer circumference 9h of the bend 9c (pitch-adjusted area) is equal to the helical pitch P _9a in the non-pitch-adjusted area 9a' (P _{9h ≈P 9a} ). The helical pitch P _9g of the reinforcing strip 12 in the inner circumference portion 9g of the bend 9c is smaller than the helical pitches P _9h and P _9a in the outer circumference portion 9h and the non-pitch-adjusted region 9a′ (P _9g < P _9h , P _9g < _P9a ).

The helical pitch P _9d of the reinforcement strip 12 in the strength deterioration corresponding portion 9d (pitch-adjusted region) is smaller than the helical pitch P _9a in the non-pitch-adjusted region 9a′ (P _9d <P _9a ). The length of the strength deterioration corresponding portion 9d along the pipe line direction (horizontal direction in FIG. 3) may be equal to or longer than the length of the strength deterioration portion 1d in the same direction.

As shown in FIGS. 1 and 3, a filler layer 4 is laminated on the inner wall 1b of the bent portion 1c and the strength deteriorated portion 1d (region corresponding to the pitch adjustment region) of the existing tubular body 1. FIG. The remaining reinforcing strip 2 is buried inside the filler layer 4 . The filler layer 4 is made of mortar. The inner peripheral surface (lower surface in FIG. 3) of the filler layer 4 is flush with the inner peripheral surface (lower surface in FIG. 3) of the non-pitch-adjusted region 9a' of the rehabilitating pipe 9. These inner peripheral surfaces are smoothly continuous without steps. The inner peripheral surface of the rehabilitating pipe 9 is defined by the filler layer 4 in the pitch adjusting regions 9c and 9d.

The deteriorated existing tubular body 1 is rehabilitated as follows.
<Step of setting pitch adjustment area>
The situation of the existing tubular body 1 before rehabilitation is investigated in advance, and the pitch adjustment area is set.
Specifically, when the existing tubular body 1 has a strength deterioration portion 1d, a section of the rehabilitated pipe 9 corresponding thereto is set as a strength deterioration corresponding portion 9d (pitch adjustment region).
Then, the required strip length _L0 of the reinforcing strip 12 and the helical pitch P9d after adjustment, which can ensure the required strength of the portion _9d corresponding to the strength deterioration, are obtained by strength calculation. The reinforcement strip 12 may be regarded as a reinforcing bar, and the amount of reinforcing bars and the strength of the filler layer 4 (mortar) may be applied to the strength calculation formula of reinforced concrete.

If there is a bent portion 1c in the pipeline of the existing tubular body 1, the bent portion 9c of the rehabilitating pipe 9 corresponding to this is set as the pitch adjustment region. The helical pitch P _9g0 of the inner circumference portion 9g of the bend 9c during tube manufacturing is equal to the helical pitch P _9a of the non-pitch-adjusted region 9a′, and the helical pitch P _9g0 (=P _9a ) and the bend 1c A helical pitch P _9h0 (>P _9g0 ) of the outer peripheral portion 9h at the time of tube manufacturing is calculated from the angle, curvature, and the like. In addition, when the band length L1 of the band-shaped member ₁₀ at the bending portion 9c at the time of tube manufacturing is obtained, and the spiral pitch of the outer peripheral portion 9h is reduced to the spiral pitch P9a of the non-pitch adjustment region _9a ', the shortage at the bending portion 9c is obtained. The strip length L2 of the strip _- shaped member 10 is obtained. The sum of the strip length L ₁ during tube production and the strip length L ₂ is set as the required strip length L ₃ (=L ₁ +L ₂ ) of the strip member 10 for forming the bend 9c.

<Pipe manufacturing process>
After the preliminary survey, the pipe manufacturing process will be implemented. As shown schematically in FIG. 4, the rehabilitated pipe 9 is produced by the pipe making device 3 . As the pipe making device 3, for example, a self-propelled pipe making device having the same basic structure as that disclosed in the aforementioned Patent Document 1 is used.
As shown in FIG. 4 , the pipe-making device 3 is arranged at the leading end of the rehabilitating pipe 9 (the pipe-manufactured portion of the band-shaped member 10 ) in the existing tubular body 1 . The continuous belt-shaped member 10 is fed into the pipe making apparatus 3 in order of unmanufactured portions (not shown). In the pipe making apparatus 3, the leading end portion of the helical rehabilitating pipe 9 in the extending direction and the fitting portions 93 and 94 facing the unmanufactured pipe portion are fitted to each other. At the same time, the pipe making device 3 is propelled (self-propelled) forward in the drawing direction while rotating along the inner wall of the existing tubular body 1, and the rehabilitating pipe 9 is drawn.

<Pipe manufacturing of the portion 9d corresponding to strength deterioration (pitch adjustment region)>
When the pipe is manufactured along the extending direction of the rehabilitating pipe 9 up to the start end 9d1 of the strength deterioration corresponding portion 9d (pitch adjustment region), the pipe manufacturing operation is temporarily stopped. By manufacturing the belt-like member 10 of the required belt length _L0 from there, the pipe is manufactured up to the terminal end 9d2 of the portion 9d corresponding to strength deterioration. It can be confirmed from the scale printed on the band-shaped member 10 whether the tube has been manufactured to the end 9d2.
The helical pitch of the portion 9d corresponding to strength deterioration during pipe making is equal to the helical pitch P9a of the non-pitch-adjusted region _9a '.
A few more turns are made over the portion 9d corresponding to strength deterioration. Preferably, the pipe making operation is temporarily stopped after about two turns of the pipe are made from the end 9d2.

<Removal process>
Then, as shown in FIG. 5, the main belt member 11 is peeled off from the belt member 10 constituting the portion 9d corresponding to strength deterioration and removed. The reinforcing strip 12 is left.
For example, as shown in FIG. 6, using a jig (not shown) such as a saber saw, the ribs 15 and 16 to which the reinforcement strip 12 is locked are pulled from the inside of the rehabilitation pipe 9 in the winding direction of the strip member 10 . cut along. It may be cut from the start end 9d1 toward the end end 9d2, or may be cut from the end end 9d2 toward the start end 9d1. Two ribs 15, 16 on both sides of the reinforcing strip 12 are cut off respectively. As indicated by the cutting line CL- ₁ in FIG. 6A, the ribs 15 and 16 may be cut parallel to the erecting direction (upper and lower in the same figure), as indicated by the cutting line CL- ₂ in FIG. 6B. , the ribs 15 and 16 may be cut obliquely with respect to the standing direction.
After cutting the ribs 15 and 16 over the entire strength deterioration corresponding portion 9d, the main strip 11 at the starting end 9d1 is cut in the width direction. Similarly, the main strip 11 at the terminal end 9d2 is cut in the strip width direction. The reinforcement strip 12 is not cut. After that, only the main strip material 11 is peeled off and removed. All of the main strip 11 from the starting end 9d1 to the terminal end 9d2 of the strength deterioration corresponding portion 9d is peeled off, not only a part thereof.
As a result, the portion 9d corresponding to strength deterioration is composed only of the spiral reinforcing strip 12. As shown in FIG. The helical pitch of the reinforcement strip 12 at this point is equal to the helical pitch P _9a of the non-pitch-adjusted regions 9a'.
On the tip end side (on the tube making device 3 side) of the extension direction from the terminal end 9d2, the tip end tube portion 9e of about two turns (the portion of several turns made over the pitch adjustment region) remains.

<Pitch adjustment process>
Subsequently, as shown in FIG. 7, the tip tube portion 9e and the tube making device 3 are shifted toward the starting end 9d1. As a result, the helical pitch P9d of the reinforcement strip 12 of the portion corresponding to strength deterioration _9d is reduced.
Since the reinforcement strip 12 of the portion 9d corresponding to the deterioration of strength is stretchable in the pipe line direction, the pitch can be easily adjusted manually. Pitch may be adjusted using power such as a jack.
The helical pitch P _9d after pitch adjustment is smaller than the helical pitch P _9a in the non-pitch-adjusted region 9a′ (P _9d <P _9a ). Preferably, the position of the terminal end 9d2 is adjusted so that the section length (the distance from the starting end 9d1 to the terminal end 9d2) of the strength deterioration corresponding portion 9d becomes the size set in the setting step. More preferably, the helical pitch P _9d is finely adjusted by manually moving the reinforcement strip 12 of the portion 9d corresponding to strength deterioration so that it matches the value obtained by the strength calculation in the setting process in advance.

<Restarting the pipe manufacturing process>
As shown in FIG. 8, pipe making is then resumed.
<Manufacturing of bent portion 9c (pitch adjustment region)>
When the tube has been made up to the starting end 9c1 of the bend portion 9c (pitch adjustment area), the tube making operation is temporarily stopped. Using the scale (not shown) of the band-shaped member 10 as an index, the band-shaped member 10 having the required band length L of ₃ is produced.
The bent portion 9c is produced by the belt _- like member 10 having the required belt length L3, and the lacking portion 9c' is produced by the belt _- like member ₁₀ having the insufficient belt length L2. After the end tube portion 9c2 of the lacking tube portion 9c' is exceeded and the tip tube portion 9e2 of about several turns (preferably about two turns) is made, the tube making operation is temporarily stopped.
The helical pitch P9g0 of the inner circumference portion 9g of the bent portion 9c during pipe production is equal to the helical pitch _P9a of the non-pitch-adjusted region _9a ′, and the helical pitch _P9h0 of the outer circumference portion 9h is equal to that of the pitch-non-pitch-adjusted region 9a′. Greater than the helical pitch _P9a . As shown in FIG. 9, the fitting portions 13 and 14 are opened at the outer peripheral portion 9h.

<Step of removing bent portion 9c>
Next, as shown in FIG. 10, the main strip 11 is removed from the strip 10 forming the bent portion 9c and the insufficient tube portion 9c'. The reinforcing strip 12 is left.

<Pitch adjustment process of bent portion 9c>
Subsequently, as shown in FIG. 11, the lacking tube portion 9c', the tip tube portion 9e2, and the tube manufacturing device 3 are shifted toward the starting end 9c1. As a result, the helical pitch of the reinforcing strip 12 at the bend 9c is reduced. In addition, the missing tube portion 9c' is incorporated into the bent portion 9c. Preferably, it is moved until the terminal end 9c2 reaches the corresponding end of the bend 1c. By doing so, the helical pitch P _9h in the outer circumference portion 9h becomes equivalent to the helical pitch P _9a in the non-pitch-adjusted region 9a′ (P _{9h ≈P 9a} ). The helical pitch P _9g in the inner portion 9g is smaller than the helical pitches P _9h and P _9a in the outer portion 9h and the non-pitch-adjusted region 9a′ (P _9g <P _9h , P _9g <P _9a ).

<Restarting the pipe manufacturing process>
As shown in FIG. 12, pipe making is then resumed. When the pitch adjustment areas 9c and 9d appear again, the above procedure is repeated.
In this manner, the rehabilitating pipe 9 is manufactured over the entire region of the existing tubular body 1 to be rehabilitated.

<Embedding process>
As shown in FIGS. 1 and 3, mortar is then laminated on the inner wall 1b of the weakened portion 1d of the existing tubular body 1 to form the filler layer 4. As shown in FIGS. A reinforcement strip 12 for the portion 9d corresponding to strength deterioration is embedded in the filling material layer 4. As shown in FIG. Similarly, the inner wall 1b of the bent portion 1c of the existing tubular body 1 is also filled with mortar to form the filler layer 4, and the reinforcing strip 12 of the bent portion 9c is embedded in the filler layer 4. As a result, the reinforcement strips 12 of the pitch adjustment regions 9c and 9d can be prevented from being exposed to the internal flow path of the rehabilitating pipe 9, and corrosion of the reinforcement strips 12 can be suppressed.
Preferably, the inner peripheral surface of the filler layer 4 is flush with the inner peripheral surface of the non-pitch-adjusted region 9a' of the rehabilitating pipe 9 so that the two inner peripheral surfaces are smoothly continuous without steps. As a result, obstruction of flow in the rehabilitation pipe 9 can be prevented.

Thus, the existing tubular body 1 is rehabilitated. The strength of the bent portion 9c is exhibited by the reinforcing strip 12 and the filler layer 4 of the bent portion 9c. Moreover, since the reinforcing strip 12 on the outer circumference 9h of the bend 9c has the same helical pitch as that of the non-pitch-adjusted region 9a', the required strength of the rehabilitating pipe 9 in the outer circumference 9h can be ensured.
Further, the strength of the portion 9d corresponding to strength deterioration is exhibited by the reinforcement strip 12 and the filler layer 4 of the portion 9d corresponding to strength deterioration. Moreover, since the reinforcing strip 12 in the portion 9d corresponding to strength deterioration has a helical pitch narrower than that of the non-pitch-adjusted region 9a', the required strength of the rehabilitating pipe 9 in the portion 9d corresponding to strength deterioration can be ensured.

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, it is possible that the bent portion 1c of the existing tubular body 1 is the strength-degraded portion 1d where the strength is severely deteriorated, and the bent portion 9c of the rehabilitating pipe 9 is the strength-deteriorated portion 9d. In this case, priority is given to measures against strength deterioration, and it is preferable to make the spiral pitch P _9h in the outer peripheral portion 9h smaller than the spiral pitch P _9a in the non-pitch-adjusted region 9a' (P _9h <P _9a ).
The spiral pitch P9h in the outer peripheral portion _9h may be smaller than the spiral pitch P9a in the pitch non-adjusting region _9a ' regardless of the degree of strength deterioration of the bent portion 1c.
The strip-shaped member 10 of the embodiment is an example, and the present invention can be applied to strip-shaped members having various cross-sectional shapes. For example, a belt-like member 10B having a cross-sectional shape shown in FIG. 13 may be used.
A band-like member having an elastic portion (bellows) that can be expanded and contracted in the band width direction may be used (see Patent Documents 1 and 2). When the bending portion 9c is pipe-manufactured by a belt-shaped member with an expandable portion, the expandable portion expands in the outer peripheral portion 9h, thereby widening the helical pitch _P9h0 during pipe-manufacturing. Thereafter, by removing the main strip 11 of the bent portion 9c, the spiral pitch P9h of the outer peripheral portion _9h can be easily adjusted by hand in the direction of shrinking. Similarly, the pitch of the portion 9d corresponding to strength deterioration can be easily adjusted by removing the main strip 11, and there is no need to contract the elongated stretchable portion.
A helical rehabilitation pipe may be produced by connecting the edges of the helically wound band-shaped member that are opposite to each other with a connecting band (joiner) via a connecting band (joiner) ( See FIG. 4 of Patent Document 1). In this case, the step of removing the main strip of the strip-shaped member may be performed before or after the step of connecting with the connecting strip.
After the pitch adjustment process for the pitch adjustment regions 9c and 9d, the embedding process by forming the filler layer 4 may be performed before resuming pipe production.
The space between the non-pitch-adjusted region 9 a ′ of the rehabilitating pipe 9 and the existing tubular body 1 may also be filled with a backfilling material such as mortar similar to the filling material layer 4 . In the case where the rehabilitating pipe 9 is a composite pipe that cooperates with the existing tubular body 1 to provide strength after rehabilitating, the back-filling material in the non-pitch-adjusted region 9a' is made to satisfy the required strength as a strength member. In the case where the rehabilitating pipe 9 is a self-supporting pipe that alone bears the strength after rehabilitating, the back-filling material in the non-pitch-adjusted region 9a' may function as a filling material. In particular, in a composite pipe, it is preferable that the filler layers 4 in the pitch adjustment regions 9c and 9d satisfy the required strength as strength members.
The filler layer 4 may be made of epoxy-based, acrylic-based resin, or the like.

INDUSTRIAL APPLICABILITY The present invention can be applied, for example, to rehabilitation of aged sewage pipes and tunnels.

1 existing tubular body 1b inner wall 1b
1c bend (area corresponding to pitch adjustment area)
1d Strength deterioration portion (region corresponding to pitch adjustment region)
3 Pipe making device 4 Filling material layer 9 Rehabilitation pipe 9a Straight portion 9a′ Non-pitch adjustment region 9c Bent portion (pitch adjustment region)
9c' Insufficient pipe portion 9d Strength deterioration corresponding portion (pitch adjustment region)
9e, 9e2 Tip tube part (part with several turns)
9h Outer portion 9g Inner portion P _9a Spiral pitch P in non-pitch-adjusted region _9d Adjusted helical pitch P in portion corresponding to strength deterioration _9h Adjusted helical pitch P in _outer portion Main strip 12 Reinforcement strip

Claims (5)

A rehabilitation method for rehabilitating an existing tubular body,
a pipe-making step of producing a helical rehabilitated pipe by spirally winding a band-shaped member including a synthetic resin main band and a metal reinforcing band along the inner wall of the existing tubular body;
a removing step of removing the main strip from the strip in the pitch adjustment region set in the rehabilitating pipe;
a pitch adjusting step of reducing the helical pitch of the reinforcing strip left in the pitch adjusting region;
an embedding step of laminating a filler layer on the inner wall of the region of the existing tubular body corresponding to the pitch adjustment region, and burying the remaining reinforcing strip inside the filler layer;
A method for rehabilitating an existing tubular body, comprising: setting the pitch adjustment region to a bent portion of the pipeline;
2. The pitch adjusting step adjusts the helical pitch of the remaining reinforcing strip in the outer circumference of the bend so that it is equal to or less than the helical pitch in the non-pitch-adjusted region. Rehabilitation method described in. setting the pitch adjustment region so as to correspond to the strength deterioration portion of the existing tubular body;
3. The method according to claim 1, wherein in the pitch adjusting step, the helical pitch of the reinforcing strip left in the pitch adjusting region corresponding to the strength deteriorated portion is made smaller than the helical pitch in the non-pitch adjusting region. Rehabilitation method. When the rehabilitating pipe has been produced by several turns over the pitch adjustment region, the production of the rehabilitating pipe is temporarily stopped and the main strip material in the pitch adjustment region is removed, and then the several turns of the rehabilitating pipe are produced. is shifted toward the pitch adjustment area. A helical tubular rehabilitated pipe comprising a belt-shaped member spirally wound along the inner wall of the existing tubular body, wherein the belt-shaped member includes a main belt made of synthetic resin and a reinforcement belt made of metal,
A pitch adjustment area is set in the rehabilitating pipe, and in the pitch adjustment area, only the reinforcing strip is left among the main strip and the reinforcing strip of the strip-shaped member,
and the helical pitch of the retained reinforcing strip is equal to or less than the helical pitch in the non-pitch-adjusted region,
Further, the existing tubular body rehabilitation structure is characterized in that the remaining reinforcing strip material is buried inside the filler layer laminated on the inner wall of the region of the existing tubular body corresponding to the pitch adjustment region.

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