JP7044605B2 - Rehabilitation tube unwinding method and unwinding band material - Google Patents

Description

The present invention relates to a method of unwinding a spiral tubular rehabilitation pipe and a winding strip material used in the method, and particularly from a strip-shaped member to a rehabilitation pipe along the inner circumference of an existing pipe such as an aged sewage pipe by a pipe making machine. The present invention relates to an unwinding method and an unwinding member performed prior to making a pipe.

It is known that existing pipes such as aging sewer pipes are rehabilitated by, for example, the SPR (Spiral Pipe Renewal) method (see Patent Documents 1 and 2 and the like). In the SPR method, a pipe-making machine is used to spirally wind a strip-shaped member (profile) along the inner circumference of an existing pipe, and join edges adjacent to each other by uneven fitting. As a result, a rehabilitation pipe along the inner circumference of the existing pipe is manufactured.
The pipe making machine has a pair of drive rollers and an annular inner circumference restricting body (link roller). The uneven fitting is performed by the drive roller. The diameter of the rehabilitated pipe is determined by winding the one circumference of the end of the rehabilitated pipe around the outer circumference of the inner peripheral restrictor (link roller) during the pipe making.

At the initial stage of this type of pipe making method, the following unwinding work is performed. Carry the pipe making machine into the manhole. In addition, the strip-shaped member is drawn out from the drum on the ground and inserted into the manhole. Then, in the manhole, after spirally winding one or more turns from the end of the strip-shaped member and assembling it to the pipe-making machine, the pipe-making machine is driven until the strip-shaped member is tightly wound around the inner circumference restricting body.

Japanese Patent No. 4866428 International publication number WO2012 / 108434

In the above-mentioned unwinding operation, it is necessary to drive the pipe making machine for several turns to make pipes until the strip-shaped member is tightly wound around the inner circumference restricting body. In addition, depending on the rigidity of the strip-shaped member and the diameter of the rehabilitated pipe, it is difficult to manually supply and wind the strip-shaped member to the pipe making machine in a narrow manhole or an existing pipe, which requires time. Was.
In view of such circumstances, it is an object of the present invention to provide a method for performing a simple and short-time unwinding operation when producing a spiral tubular rehabilitation tube from a strip-shaped member.

In order to solve the above-mentioned problems, the present invention is a method of unwinding the rehabilitation pipe prior to making the strip-shaped member into a spiral tubular rehabilitation pipe along the inner circumference of the existing pipe by a pipe making machine.
Prepare an unwinding band material having a length obtained by adding the fitting allowance to the peripheral length of the rehabilitation tube.
An unwinding ring is produced by winding the unwinding strip material in a spiral shape and fitting both ends thereof by the length of the fitting allowance.
Assemble the unwinding ring or the unwinding band material before fitting and the pipe making machine.
Further, the end portion of the strip-shaped member is introduced into the pipe making machine and is joined to one end portion of the unwound strip material after fitting.
According to the unwinding method, an unwinding ring having a predetermined diameter or a circumference is produced from an unwinding strip having a predetermined length. It is not necessary to drive the pipe making machine for several turns for unwinding. As a result, the unwinding work can be performed easily and in a short time. Work can be easily performed even in a narrow manhole.

The pipe making machine is arranged in a part of the unwinding ring in the circumferential direction, and the part of the unwinding ring excluding the part in the circumferential direction is released to the inner peripheral side, and after the joining, in the released state. It is preferable to start the pipe making.
As the pipe making machine, for example, the pipe making machine described in International Publication WO2018 / 043619 can be used. The pipe making machine has a drive roller that diagonally pushes a strip-shaped member of an unmade pipe into a pipe portion that has been made pipe, and a pipe end guide that is locked to the end portion of the pipe portion that has been made pipe. The inner circumference regulator is omitted. Therefore, it is not necessary to wind the unwinding band material around the inner peripheral restricting body, and the unwinding ring can be easily manufactured. Moreover, the work of assembling the unwinding ring and the pipe making machine can be facilitated.

A flexible strip is slidably hung around the outer circumference of the unwinding ring, and both ends of the strip are engaged to the pipe making machine. It is preferable to start the pipe making.
By making the strip so that it sticks to the outer circumference of the rehabilitation pipe, tension acts on the strip and the rehabilitation pipe is regulated from the outer circumference side. The circumference of the rehabilitation tube can be set according to the length of the strip.

The unwinding strip material before fitting may be wound around the winding habit-imparting frame manufactured according to the inner peripheral shape of the existing pipe to impart the winding habit to the unwinding strip material.
As a result, the unwinding strip can be easily looped inside the manhole, and the unwinding ring can be easily manufactured. In particular, when the inner peripheral shape of the existing pipe has a non-circular cross section, the unwinding member can be given a non-circular winding habit according to the non-circular cross section. As a result, unwinding can be easily performed.

The unwound strip material preferably has the same cross section as the strip-shaped member.
As the unwinding band material, a band-shaped member cut to a predetermined length, that is, a length obtained by adding a fitting allowance to the peripheral length of the rehabilitation tube can be used.

According to the present invention, the unwinding operation when manufacturing a spiral tubular rehabilitation tube from a strip-shaped member can be performed easily and in a short time.

FIG. 1A is a perspective view showing a state before the unwinding strip material of the first embodiment of the present invention is made into an unwinding ring. FIG. 1B is a perspective view of the unwinding ring. FIG. 2A is a cross-sectional view of the unwound strip material along the line IIa-IIa of FIG. 1A. FIG. 2B is a cross-sectional view of the fitting allowance portion of the unwinding ring along the line IIb-IIb of FIG. 1B. FIG. 3 is a front view showing how the pipe making machine is assembled to the unwinding ring. FIG. 4A is a front view showing a state in which a pipe making machine is assembled to the unwinding ring. FIG. 4B is a perspective view of the same state. FIG. 5A is a front view showing a state in which the strip-shaped member is passed through a pipe making machine and joined to the unwound strip material. FIG. 5B is a perspective view of the same state. FIG. 6 is a perspective view showing a state of making a rehabilitated pipe. FIG. 7 is a cross-sectional view showing how the existing pipe is rehabilitated. FIG. 8 shows a second embodiment of the present invention, and is a cross-sectional view of a manhole showing how a winding band material and a pipe making machine are inserted into the manhole. 9A and 9B show a third embodiment of the present invention, and FIG. 9A is a front view showing a state in which an outer peripheral regulating strip is wound around the outer periphery of the unwinding ring. FIG. 9B is a perspective view of the same state. FIG. 10 is a perspective view showing a state of making a rehabilitated tube according to the third embodiment. FIG. 11 shows a fourth embodiment of the present invention, and is a plan view of a state in which a winding habit is imparted to the unwinding strip material. FIG. 12 is a cross-sectional view of an existing pipe showing a state of making a rehabilitated pipe in the fourth embodiment. FIG. 13 is a cross-sectional view taken along the line XIII-XIII of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 7 shows a state in which the old existing pipe 1 is rehabilitated. Examples of the existing pipe 1 include sewer pipes, water pipes, agricultural water pipes, hydropower transmission pipes, gas pipes and the like. The existing pipe 1 is rehabilitated by lining the rehabilitation pipe 9 on the inner circumference of the existing pipe 1.

As shown in FIG. 7, the rehabilitation tube 9 is composed of a band-shaped member 90. The spiral tubular rehabilitation tube 9 is manufactured by winding the band-shaped member 90 in a spiral shape and joining the adjacent edges so as to be different from each other.

As shown in FIG. 7, the pipe making is performed by using the pipe making machine 3. As shown in FIG. 4, the pipe making machine 3 has the same structure as the pipe making machine disclosed in, for example, the international publication WO2018 / 043619, and includes a device frame 3f, which is simply illustrated, and a pair of drive rollers 31. Includes tube end guide 32. As shown in FIG. 6, the apparatus frame 3f and thus the pipe making machine 3 are arranged at one place in the circumferential direction of the pipe end portion 9e of the pipe-made portion (hereinafter referred to as “preceding spiral pipe portion 9a”) in the strip-shaped member 90. Will be done. Here, the tube end portion 9e refers to a portion about one circumference of the tip of the leading spiral tube portion 9a in the extending direction.

As shown in FIG. 6, a pair of drive rollers 31 and a tube end guide 32 are provided on the device frame 3f. The pair of drive rollers 31 sandwich an unmade pipe portion (hereinafter referred to as "subsequent strip portion 90b") in the strip-shaped member 90. The pipe end guide 32 includes guide portions 32a and 32b separated in the propulsion front-back direction (white arrow in FIG. 6) of the pipe making machine 3. The guide portion 32a on the front side includes a holding portion 33 and a locking portion 34. The rear guide portion 32b includes a holding portion 35 and a locking portion 36. The roller-shaped or block-shaped pressing portions 33 and 35 are addressed to the pipe end portion 9e from the inner peripheral side. The hook-shaped locking portions 34 and 36 are locked to the pipe end portion 9e from the outer peripheral side (see the virtual line in FIG. 2B and FIG. 13). The locking portions 34 and 36, and thus the pipe end guide 32, are constrained in the pipe axial direction of the leading spiral pipe portion 9a and can slide in the winding direction of the leading spiral pipe portion 9a.
The number of guide portions of the pipe end guide 32 is not limited to two, and may be three or more. Three or more guide portions may be arranged at intervals in the propulsion front-rear direction of the pipe making machine 3.

By the rotational drive of the pair of drive rollers 31, the succeeding band portion 90b is pushed out diagonally from the inside of the pipe end portion 9e toward the pipe end portion 9e, and is unevenly fitted with the edge that precedes the pipe end portion 9e. .. This advances pipe making. Moreover, the propulsion reaction force is generated by the uneven fitting, so that the pipe making machine 3 is propelled (self-propelled) clockwise as shown by the white arrow in FIG.
The pipe making machine 3 does not have an inner peripheral restricting body such as a link roller. Therefore, the portion of the pipe end portion 9e in the circumferential direction except for the portion where the device frame 3f is arranged is released to the inner peripheral side.

<Unwinding method>
Prior to the pipe making of the rehabilitation pipe 9 by the pipe making machine 3, the following unwinding work is performed.
<Preparation of unwinding band material>
As shown in FIG. 1A, first, the unwinding strip 80 is prepared. The length L ₈ of the unwinding strip 80 is the size (L ₈ = L ₉ + L _8d ) obtained by adding the length L _8d of the fitting allowance 8d to the peripheral length L ₉ of the rehabilitation pipe 9. As the unwinding strip material ₈₀ , preferably, the strip-shaped member 90 is cut into a predetermined length L8 and used. It is also possible to use scraps of the band-shaped member 90.

The unwound strip material 80 has the same cross section as the strip-shaped member 90. Specifically, as shown in FIG. 2A, the unwinding strip 80 includes a strip main body 81 and a reinforcing strip 85. The band body 81 is made of a synthetic resin such as polyvinyl chloride. The band main body 81 has a flat band portion 82 and fitting portions 83, 84. A rib 86 is provided at, for example, a central portion in the width direction on the outer surface of the flat band portion 82 (the surface facing the inner wall of the existing pipe 1). A first fitting portion 83 is formed on one side (left side in FIG. 2A) in the width direction of the flat band portion 82, and a second fitting portion 84 is formed on the other edge. There is. A reinforcing strip 85 is provided on the outer surface of the strip main body 81 (the surface facing the inner wall of the existing pipe 1). The reinforcing strip 85 is made of a metal such as steel.
The cross-sectional shape of the unwound strip material 80 (cross-sectional shape of the strip-shaped member 90) shown is merely an example, and the method of the present invention can be applied to various cross-sectional shapes of the unwound strip material 80 (belt-shaped member 90). ..
The reinforcing strip 85 may be omitted.

<Giving curl habit>
Preferably, the unwinding strip 80 is looped about once on the ground in advance to give a winding habit. In particular, when the unwinding strip 80 has high rigidity, it is preferable to give a winding habit in advance. However, when the winding habit is applied, the fitting portions 83 and 84 at both ends of the unwinding strip 80 are not fitted to each other.

<Insert manhole in unwinding band material>
The unwinding strip 80 is unloaded from the ground into the manhole 4. Since both ends of the unwinding strip 80 are open, it can be easily inserted even if the manhole 4 has a small diameter.

<Making unwinding ring>
As shown in FIG. 1 (a)), the unwinding strip 80 is spirally wound around the human hole 4 and both ends thereof are overlapped in the width direction by the length L _8d of the fitting allowance 8d. By creating a winding habit on the ground in advance, it is possible to reduce the burden of manual winding work in the manhole 4.
Then, as shown in FIG. 1 (b), the opposing edges of the unwinding strip 80 are fitted to each other. Specifically, as shown in FIG. 2B, the first fitting portion 83 of one end portion (right end portion in the figure) of the unwinding strip 80 and the second end portion (left end portion in the figure). The fitting portion 84 is unevenly fitted from the inner peripheral side (upper side in the figure). The fitting work can be performed manually by using a hammer or the like. As a result, the unwinding ring 8 is produced as shown in FIG. 1 (b).
The unwinding strip 80 may be wound independently in a ring shape, and there is no need to wind it around an inner peripheral regulator or the like. Therefore, the unwinding ring 8 can be easily manufactured even in a narrow manhole 4. When the manhole 4 has a large diameter, the unwinding ring 8 may be manufactured on the ground and then hung in the manhole 4.
An unwinding ring may be produced by winding the unwinding strip 80 around the existing pipe 1 while sticking it along the inner circumference.
Further, by adjusting the length of the fitting allowance 8d, the peripheral length of the unwinding ring 8 can be easily matched with the peripheral length of the rehabilitation pipe 8. It is not necessary to drive the pipe making machine for several turns.
At least one end of the unwinding strip 80 may be provided with a marking 8f indicating the range of the fitting allowance 8d. Thereby, the peripheral length of the unwinding ring 8 can be surely and easily matched with the peripheral length of the rehabilitation pipe 8.

<Insert manhole in pipe making machine>
Before and after the production of the unwinding ring 8, the pipe making machine 3 is lowered into the manhole 4. Then, as shown in FIG. 3, the pipe making machine 3 with the locking portions 34 and 36 removed is arranged on the inner peripheral side of the unwinding ring 8. After that, the locking portions 34 and 36 are attached to the pipe making machine 3 from the outer peripheral side of the unwinding ring 8 and locked to the unwinding ring 8. As a result, as shown in FIG. 4A, the pipe making machine 3 is assembled to the unwinding ring 8 (unwinding band material 80 after fitting). The pipe making machine 3 is restrained in the width direction of the unwinding strip 80 by the locking by the locking portions 34 and 36, and can slide in the circumferential direction of the unwinding ring 8. As shown in FIG. 4B, the front and rear guide portions 32a and 32b of the pipe making machine 3 are separated from each other in the circumferential direction of the unwinding ring 8 and deviated by the spiral pitch of the unwinding ring 8.
The apparatus frame 3f and thus the pipe making machine 3 are arranged in a part of the unwinding ring 8 in the circumferential direction. The portion of the unwinding ring 8 in the circumferential direction except for the portion thereof is released to the inner peripheral side.

<Introduction of band-shaped members>
Next, the strip-shaped member 90 is drawn out from the drum 5 on the ground and hung down in the manhole 4 (see FIG. 7). As shown in FIG. 5, the end portion of the strip-shaped member 90 is introduced into the pipe making machine 3 and passed through a pair of drive rollers 31 to engage with the pipe making machine 3.

<Joining of strip-shaped member and unwinding strip>
Subsequently, the end portion of the strip-shaped member 90 is joined to one end portion 80e of the unwinding strip material 80 in the unwinding ring 8. As a joining method, a known joining method between strip-shaped members can be applied. For example, a connecting member (not shown) is arranged so as to straddle between the steel reinforcing strip of the strip member 90 and the unwinding strip 80, and the connecting member is unwound with the steel reinforcing strip of the strip member 90. It is joined to the steel reinforcing strip 85 of the strip 80 by bolts or welding. The resin portion or the metal portion of the strip-shaped member 90 and the unwinding strip 80 may be abutted against each other and directly welded.
In this way, the unwinding work can be easily performed in a short time. Even if the manhole 4 is narrow, the unwinding work can be easily performed.

<Making rehabilitation pipes>
After that, the unwinding ring 8 is aligned with the mouth of the existing pipe 1 and the drive roller 31 of the pipe making machine 3 is rotationally driven to start the pipe making. As shown in FIGS. 6 and 7, this causes the rehabilitation pipe 9 to be manufactured along the inner circumference of the existing pipe 1 following the unwinding ring 8. The unwinding ring 8 at the start of pipe making is in a state of being released to the inner peripheral side. As a result, the rehabilitation pipe 9 is manufactured without an inner circumference restrictor in a state where the pipe end portion 9e is released to the inner circumference side.
The protruding end portion 9d of the rehabilitation pipe 9 including the unwinding ring 8 into the starting manhole 4 may be excised during or after the pipe making process.

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. 8 shows a second embodiment of the present invention.
The second embodiment relates to a modified example of the unwinding procedure. As shown by the alternate long and short dash line in FIG. 8, the pipe making machine 3 is assembled to the unwinding strip 80 before fitting both ends on the ground. At this time, for example, by tightening the holding portion 33 of the pipe end guide 32, the pipe making machine 3 is non-slidingly locked to the unwinding strip 80. Then, as shown by the solid line in FIG. 8, the unwinding strip 80 with the pipe making machine 3 is hung in the manhole 4.

Then, in the manhole 4, the unwinding strip 80 is spirally wound around and the both ends are fitted to each other by the amount of the fitting allowance 8d to manufacture the unwinding ring 8. As a result, the man-hours for unwinding work in the manhole 4 can be reduced.
If the diameter of the manhole 4 is large, after assembling the pipe making machine 3 to manufacturing the unwinding ring 8 on the ground, the unwinding ring 8 with the pipe making machine 3 is placed in the manhole 4. You may hang it.
After that, by loosening the holding portion 33, the pipe making machine 3 can be slidable in the circumferential direction of the unwinding ring 8. Then, through the connecting step of the strip-shaped member 90 (see FIG. 5), the production of the rehabilitation tube 9 is started (see FIGS. 6 and 7).
According to the second embodiment, since the man-hours in the manhole 4 can be reduced, the unwinding work can be completed in a short time and the pipe making can be started.

<Third Embodiment>
9 and 10 show a third embodiment of the present invention.
As shown in FIG. 9, in the third embodiment, a flexible strip 38 is prepared. The strip 38 is composed of a wire rope. The length of the strip 38 is about the circumference of the unwinding ring 8. In addition to being flexible, the strip 38 may be any as long as it can exhibit tension without stretching and deforming when pulled. In addition to wire ropes, bands, link chains, roller chains, etc. It may be composed of.

As shown in FIGS. 9A and 9B, the strip 38 is slidably hung around the outer periphery of the unwinding ring 8 in the circumferential direction. Moreover, both ends of the strip 38 are attached to the pipe making machine 3. Then, the pipe making process is started through the connecting process of the strip-shaped member 90. That is, the pipe making is started in a state where the strip 38 is hung around the outer circumference of the unwinding ring 8.

As shown in FIG. 10, with the propulsion of the pipe making machine 3, the strip 38 rotates spirally integrally with the pipe making machine 3 from the outer circumference of the unwinding ring 8 to the outer circumference of the leading spiral pipe portion 9a. Slide to. Therefore, the strip 38 is always arranged on the outer periphery of the pipe end portion 9e.
Here, by making the pipe so that the circumference or diameter of the pipe end portion 9e becomes large, the strip 38 sticks to the outer periphery of the pipe end portion 9e, and tension acts on the strip 38. The peripheral length or diameter of the pipe end portion 9e can be regulated by the tension. Further, the tension makes the strip 38 substantially circular, and the pipe end portion 91e can have a substantially circular cross section.
In the pipe making machine 3, the frictional resistance force between the front guide portion 32a and the pipe end portion 91e and the pushing force of the strip-shaped member 90 by the drive roller 31 can be adjusted with each other, or the propulsion front-back direction of the pipe making device 3 can be adjusted. And by inclining the height direction orthogonal to the width direction with respect to the radial direction of the pipe end portion 91e, the pipe can be manufactured so that the circumference length or the diameter increases or decreases (see International Publication WO2016 / 175243).

<Fourth Embodiment>
11 to 13 show a fourth embodiment of the present invention.
As shown in FIG. 12, the existing pipe 1D in the fourth embodiment has a non-circular cross section.
As shown in FIG. 11, when rehabilitating the existing pipe 1D, a curl-imparting frame 2 is prepared. The outer peripheral shape of the curl-imparting frame 2 has a shape that matches the non-circular inner peripheral shape of the existing pipe 1D. The curl-imparting frame 2 may be divided into a plurality of pieces 2a in the circumferential direction, and the curl-imparting frame 2 may be assembled by joining these pieces 2a in an annular shape at the time of use.
By winding the unwinding strip 80 around the outer circumference of the winding habit-imparting frame 2, the winding habit is imparted to the unwinding strip 80 so as to follow the outer peripheral shape of the winding habit-imparting frame 2. The winding habit-imparting step can be performed on the ground.

After that, the unwinding strip 80 is removed from the winding habit-imparting frame 2 and inserted into the manhole 4. At this time, the unwinding strip 80 may be stretched to some extent to facilitate insertion. After that, when the stretched force is released, the unwinding strip 80 tries to return to a shape having a winding habit.

As shown in FIG. 12, the unwinding strip 80 is wound around the mouth of the existing pipe 1D in a predetermined non-circular spiral. By imparting a winding habit in advance, the unwinding strip 80 can be easily wound into a predetermined non-circular shape. Subsequently, both ends of the unwinding strip 80 are fitted by the amount of the fitting allowance 8d. Thereby, a non-circular unwinding ring 8D along the inner circumference of the existing pipe 1D can be easily manufactured.

Subsequently, the pipe making machine 3 is assembled to the unwinding ring 8D. Specifically, for example, the pipe making machine 3 from which the locking portions 34 and 36 have been removed is installed at one inner circumference of the unwinding ring 8D in the circumferential direction. Subsequently, as shown in FIGS. 12 and 13, the locking portions 34 and 36 are locked at a location different from the one location in the unwinding ring 8D. Examples of the other portion include a corner portion 1c between the bottom surface and the side surface of the existing pipe 1D. At the corner portion 1c, since the unwinding ring 8D is separated from the inner peripheral surface of the existing pipe 1D, it is easy to lock the locking portions 34 and 36 to the unwinding ring 8D. After that, the locking portions 34 and 36 are slid in the circumferential direction of the unwinding ring 8D and attached to the pipe making machine 3.
Next, as shown by the alternate long and short dash line in FIG. 12, the end portion of the strip-shaped member 90 is introduced into the pipe making machine 3, and the strip-shaped member is attached to one end of the unwinding strip 80 constituting the unwinding ring 8D. Join the ends of 90.
Then, the pipe making machine 3 is driven to make the rehabilitation pipe 9.

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, as the pipe making machine, a pipe making machine with an inner circumference restricting body such as a link roller may be used.
The rehabilitation pipe 9 may be manufactured by a push type or a traction type.
The cross section of the unwinding strip 80 may be different from the cross section of the strip member 90.
A plurality of embodiments may be combined. For example, even when the existing pipe 1 having a circular cross section of the first embodiment (FIGS. 1 to 7) is rehabilitated, the unwinding is performed in the same manner as in the fourth embodiment (FIG. 11) of rehabilitating the existing pipe 1D having a non-circular cross section. The unwinding strip 80 may be inserted into the manhole 4 after the strip 80 has a winding habit on the ground in advance. The assembly step of the pipe making machine 3 in the fourth embodiment may be performed on the ground in the same manner as in the second embodiment (FIG. 8).

The present invention can be applied to, for example, a technique for rehabilitating an aged sewer pipe.

1,1D Existing pipe 2 Winding habit giving frame 3 Pipe making machine 31 Drive roller 32 Pipe end guide 38 Strip 4 Manhole 8 Unwinding ring 8d Fitting allowance 8f Marking 80 Unwinding band material 85 Reinforcing band material 9 Rehabilitation tube 9a Leading spiral pipe part 9e Pipe end part 90 Band-shaped member 90b Subsequent band part L _8d Length of fitting allowance

Claims (6)

It is a method of unwinding the rehabilitation pipe prior to making a strip-shaped member into a spiral tubular rehabilitation pipe along the inner circumference of the existing pipe by a pipe making machine.
Prepare an unwinding band material having a length obtained by adding the fitting allowance to the peripheral length of the rehabilitation tube.
An unwinding ring is produced by winding the unwinding strip material in a spiral shape and fitting both ends thereof by the length of the fitting allowance.
After that, the unwinding ring and the pipe making machine are assembled.
Further, a method for unwinding a rehabilitated pipe, which comprises introducing an end portion of the strip-shaped member into the pipe making machine and joining the end portion of the unwinding strip material in the unwinding ring . It is a method of unwinding the rehabilitation pipe prior to making a strip-shaped member into a spiral tubular rehabilitation pipe along the inner circumference of the existing pipe by a pipe making machine.
Prepare an unwinding band material having a length obtained by adding the fitting allowance to the peripheral length of the rehabilitation tube.
Assemble the unwinding band material and the pipe making machine,
Then, the unwinding band material is spirally wound around the circumference, and both ends thereof are fitted by the length of the fitting allowance to fabricate the unwinding ring.
Further, a method for unwinding a rehabilitated pipe, which comprises introducing an end portion of the strip-shaped member into the pipe making machine and joining the end portion of the unwinding strip material in the unwinding ring. A state in which the pipe making machine is arranged in a part of the unwinding ring in the circumferential direction, and the part of the unwinding ring excluding the part in the circumferential direction is released to the inner peripheral side, and after the joining, the released state. The rehabilitation tube unwinding method according to claim 1 or 2 , wherein the tube manufacturing is started. A flexible strip is slidably hung around the outer circumference of the unwinding ring, and both ends of the strip are engaged with the pipe making machine.
The rehabilitation tube unwinding method according to claim 3 , wherein after the joining, the tube manufacturing is started in a state where the strips are hung around. Claims 1 to 4 are characterized in that the unwinding strip material before fitting is wound around the winding habit-imparting frame manufactured according to the inner peripheral shape of the existing pipe to impart the winding habit to the unwinding strip material. The method for unwinding a rehabilitation tube according to any one of the above items. Claim 1 is characterized in that the unwound band material having the same cross section as the band-shaped member is obtained by cutting the band-shaped member to a length obtained by adding a fitting allowance to the peripheral length of the rehabilitation tube. The method for unwinding a rehabilitation tube according to any one of 5 to 5 .

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