JP6769809B2 - Spiral tube making device - Google Patents

Description

The present invention relates to a pipe making device that manufactures a spiral tube by winding a strip-shaped member in a spiral shape, and in particular, a self-propelled manufacturing device that is propelled forward in the winding direction as the strip-shaped member is wound. Regarding pipe equipment.

It is known that an existing pipe such as an aged sewage pipe is rehabilitated by lining it with a spiral rehabilitation pipe (spiral pipe). For example, Patent Document 1 and the like disclose an SPR (Spiral Pipe Renewal) method using a pipe making device as an example of a rehabilitation method. The pipe making device spirally winds a band-shaped member made of synthetic resin along the inner wall of the existing pipe, and causes the leading spiral tube portion and the succeeding band portion formed in a spiral tubular shape in the strip-shaped member. The fitting portions of the edges adjacent to each other are sandwiched by a pair of drive rollers to be fitted (joined). The pipe making device is propelled (self-propelled) forward in the winding direction by the rotation of the drive roller.

In this type of pipe making device, an inner peripheral restrictor is provided inside the leading spiral pipe portion. For example, the pipe making device of Patent Document 1 has a plurality of guide rollers and an annular frame as an inner circumference restricting body (link roller). A plurality of guide rollers are arranged at intervals in the circumferential direction of the annular frame. The shape of the leading spiral tube is regulated by pressing the leading spiral tube against each guide roller.

The pipe making device of Patent Document 2 includes a plurality of rods extending radially as an inner circumference restricting body. A guide roller is provided at the tip of each rod. When the inner peripheral surface of the leading spiral tube portion is pressed against these guide rollers, tension acts on the leading spiral tube portion, and the shape of the leading spiral tube portion is regulated.

Japanese Patent No. 4866428 Japanese Patent No. 4505142

The existing pipe does not always have a constant inner diameter over the entire length, and some have an enlarged diameter portion or a reduced diameter portion. In addition, it may be necessary to change the diameter of the rehabilitation pipe (spiral pipe) because there are obstacles or the like on the inner wall of the existing pipe.
On the other hand, in the conventional pipe making device, the diameter of the rehabilitation pipe (spiral pipe) is determined by the inner circumference regulator. In order to expand or contract the rehabilitation tube (spiral tube), it is necessary to change the size of the inner circumference regulator. For example, it is necessary to incorporate a telescopic actuator into an annular inner circumference restricting body to make it expandable / contractible (Patent Document 1), or to make the rod of a radial inner circumference restricting body expandable / contractible (Patent Document 2). The structure becomes complicated.
In view of such circumstances, it is an object of the present invention to enable pipe production while expanding or contracting the diameter of the spiral pipe by a simple configuration.

In order to solve the above-mentioned problems, the present invention is a pipe making device for forming a spiral tube by spirally winding a strip-shaped member and joining adjacent edges of the strip-shaped member at one circumference difference with the propulsion. And
A first drive roller pair that sandwiches the strip-shaped member with the rotation axis directed in the width direction orthogonal to the propulsion direction, and
The rotation axis is oriented in the width direction and is arranged so as to be offset from the first drive roller pair in at least one of the propulsion direction and the width direction, and the first drive roller pair is sandwiched between the strip-shaped members. The second drive roller pair that sandwiches the wound part before the attachment part,
A roller drive unit capable of rotationally driving the first drive roller pair and the second drive roller pair at different rotational speeds,
It is characterized by being equipped with.

When the rotation speed of the first drive roller pair is made higher than the rotation speed of the second drive roller pair by the roller drive unit, the trailing band portion following the leading spiral tube portion formed in the preceding spiral in the strip-shaped member is formed. The amount or speed of feeding into the leading spiral pipe portion exceeds the amount or speed of propulsion of the pipe making device. As a result, the diameter of the front end portion (stretched front end portion) of the leading spiral tube portion in the stretching direction can be increased. When the rotation speed of the first drive roller pair is made slower than the rotation speed of the second drive roller pair by the roller drive unit, the feed amount or feed speed of the trailing band portion is lower than the propulsion amount or propulsion speed of the pipe making device. .. As a result, the diameter of the extension front end portion of the leading spiral tube portion can be reduced. As described above, according to the pipe making device, it is possible to make a spiral pipe while expanding or contracting the diameter by a simple configuration even if there is no inner circumference restricting body with an actuator for expansion / contraction. ..

The first drive roller pair may sandwich a continuous portion between the preceding spiral tube portion formed in the preceding spiral in the strip-shaped member and the succeeding band portion following the preceding spiral tube portion or a peripheral portion thereof. preferable.
As a result, the trailing band portion can be sent to the leading spiral pipe portion and joined by the first drive roller pair.

It is preferable that the second drive roller pair sandwiches a peripheral portion of the leading spiral pipe portion that is displaced by one pitch from the continuous portion to the rear side in the stretching direction.
Thereby, by adjusting the rotation speed of the first drive roller pair and the second drive roller pair, it is possible to variably adjust the circumference of the extending front end portion of the leading spiral tube portion. As a result, the diameter of the spiral tube can be reliably expanded or contracted.

At the end of at least one of the first drive roller pair and the second drive roller pair, there is a gap between edges adjacent to each other of the leading spiral tube portion formed in a spiral shape in advance of the strip-shaped member. It is preferable that the seam roller straddling the seam is provided so as to be freely rotatable around the same axis as the one roller.
As a result, the edges of the leading spiral tube portion adjacent to each other, which are adjacent to each other, can be reliably joined by being pressed by the seam roller. When the expansion / contraction operation is performed by the first drive roller pair and the second drive roller pair, the portions of the leading spiral tube portions that are different from each other slide relative to each other. At this time, by freely rotating the seam roller, it is possible to prevent a large frictional resistance from acting. Therefore, the relative slide and thus the expansion / contraction operation can be smoothly performed.

According to the pipe making device of the present invention, the spiral pipe can be made while expanding or contracting the diameter with a simple structure.

FIG. 1A is a cross-sectional view showing a state in which an existing pipe is rehabilitated by the pipe making device according to the first embodiment of the present invention. FIG. 1B is a cross-sectional view showing an existing pipe that has been rehabilitated at a smaller scale than that of FIG. 1A. FIG. 2 is a perspective view of a rehabilitation pipe (spiral pipe) being constructed by the pipe making device. FIG. 3 is a front view schematically showing the pipe making device and the rehabilitation pipe during pipe making. FIG. 4 is an explanatory plan view of the pipe making device and the rehabilitation pipe during pipe making along the IV-IV line of FIG. FIG. 5A is a cross-sectional view taken along the line Va-Va of FIG. FIG. 5B is a cross-sectional view taken along the line Vb-Vb of FIG. FIG. 5 (c) is a cross-sectional view taken along the line Vc-Vc of FIG. FIG. 6 is a front view schematically showing a pipe making device and a rehabilitated pipe according to a second embodiment of the present invention in a state of being made. FIG. 7 is an explanatory plan view of the pipe making device and the rehabilitation pipe during pipe making along the line VII-VII of FIG. FIG. 8A is a cross-sectional view taken along the line VIIIa-VIIIa of FIG. FIG. 8B is a cross-sectional view taken along the line VIIIb-VIIIb of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1A shows a state in which an old existing pipe 1 is rehabilitated. Examples of the existing pipe 1 include sewer pipes, water pipes, agricultural water pipes, gas pipes and the like. As shown in FIG. 1 (b), the existing pipe 1 extends so as to connect the starting manhole 4 and the reaching manhole 4B. For example, the intermediate portion 1c of the existing pipe 1 has a larger diameter than the constant diameter portion 1a on the starting manhole 4 side and the constant diameter portion 1e on the reaching manhole 4B side. A diameter changing portion 1b that expands in diameter from the starting side constant diameter portion 1a toward the large diameter portion 1c is provided between the starting side constant diameter portion 1a and the large diameter portion 1c. A diameter changing portion 1d that reduces the diameter from the large diameter portion 1c toward the reaching side constant diameter portion 1e is provided between the large diameter portion 1c and the reaching side constant diameter portion 1e.

As shown in FIG. 1 (b), a rehabilitation pipe 9 (spiral pipe) is lined on the inner wall of the existing pipe 1 over the entire length. The rehabilitation tube 9 is composed of one long strip-shaped member 90 and has a spiral tubular shape. The rehabilitation pipe 9 in the large diameter portion 1c has a larger diameter than the rehabilitation pipe 9 in the constant diameter portions 1a and 1e.

As shown in FIG. 1A, the strip-shaped member 90 in the middle of pipe production includes a leading spiral pipe portion 91 and a succeeding strip portion 92. As shown in FIG. 2, the strip-shaped member 90 is wound in the clockwise winding direction in FIG. 2, for example, to form a spiral tubular leading spiral tube portion 91. As shown in FIG. 1 (a), the leading spiral pipe portion 91 is from the starting manhole 4 side (right side in FIG. 1 (a), hereinafter referred to as “extension rear side”) along the axis of the existing pipe 1. It is stretched toward the reacher hole 4B side (left side in FIG. 1, hereinafter referred to as “stretching front side”). The portion of the leading spiral tube portion 91 that is about one round to more than one round of the front end in the stretching direction is referred to as a “stretching front end portion 91e”.

As shown in FIG. 1 (a), the trailing band portion 92 of the unmade pipe continues from the tip portion in the winding direction of the leading spiral pipe portion 91. The trailing band portion 92 is passed through the inside of the leading spiral pipe portion 91 and the inside of the starting manhole 4.

As shown in FIG. 5A, the strip-shaped member 90 has a certain cross section and extends in a direction substantially orthogonal to the paper surface of the figure. The material of the band body 90a of the band-shaped member 90 is, for example, a synthetic resin such as polyvinyl chloride. A metal reinforcing band material 96 is provided on the back side of the band body 90a. The reinforcing strip 96 may be omitted. A flat plate-shaped reinforcing band material may be embedded in the resin band body 90a.
A groove 95b is formed on the back side portion (outer peripheral side portion, lower portion in FIG. 5A) of the strip-shaped member 90. The groove 95b extends along the longitudinal direction of the strip member 90.

A first fitting portion 93 is formed at the edge portion on one side (left side in FIG. 5A) in the width direction of the strip-shaped member 90. A second fitting portion 94 having an inverted shape of the first fitting portion 93 is formed on the other side (right side in FIG. 5A) of the strip-shaped member 90 in the width direction. As shown in FIG. 5B, the fitting portions 93 and 94 at the edges of the leading spiral pipe portion 91 and the rehabilitation pipe 9 that are adjacent to each other are joined to each other by uneven fitting.

As shown in FIG. 1A, the pipe making device 3 is arranged on the extension front end portion 91e of the leading spiral pipe portion 91. The pipe making device 3 is propelled along the spiral winding direction (clockwise in FIG. 3) of the leading spiral pipe portion 91. The propulsion direction of the pipe making device 3 is orthogonal to the width direction of the pipe making device 3 (the direction orthogonal to the paper surface in FIG. 3).

As shown in FIG. 3, the pipe making device 3 includes a device frame 3a, a first drive roller pair 10, a second drive roller pair 20, and a roller drive unit 3b. Drive roller pairs 10, 20 and roller drive unit 3b are supported by the device frame 3a indicated by the alternate long and short dash line.

As shown in FIG. 3, the first drive roller pair 10 has a first inner peripheral drive roller 11 and a first outer peripheral drive roller 12. These first drive rollers 11 and 12 are separated from each other on the inner peripheral side (upper side in FIG. 3) and the outer peripheral side (lower side in FIG. 3) and face each other in parallel. As shown in FIG. 5 (b), the rotation axes L ₁₁ and L ₁₂ of the first drive rollers 11 and ₁₂ are both oriented in the width direction (left-right direction in the figure) of the pipe making device 3. As shown in FIGS. 4 and 5B, the first inner peripheral drive roller 11 has a cylindrical shape having a length substantially the same as the width of the strip-shaped member 90. As shown in FIG. 5B, the first outer peripheral drive roller 12 extends parallel to the first inner peripheral drive roller 11 and by substantially the same length as the first inner peripheral drive roller 11. A locking flange 12f is provided on the peripheral side of the first outer peripheral drive roller 12.

As shown in FIGS. 3 and 4, the first drive roller pair 10 is arranged on the continuous portion 91c of the trailing strip portion 92 and the leading spiral pipe portion 91 of the strip-shaped member 90. As shown in FIG. 5B, the first inner peripheral drive roller 11 and the first outer peripheral drive roller 12 of the first drive roller pair 10 sandwich the continuous portion 91c.
Further, the locking flange 12f enters the groove 95b and is locked. The locking flange 12f is relatively slidable in the extending direction of the groove 95b (the direction orthogonal to the paper surface in FIG. 5B), and is restricted from moving in the width direction of the groove 95b (the left-right direction in FIG. 5B). There is.

As shown by the alternate long and short dash line in FIG. 3, the pipe making device 3 is equipped with a roller drive unit 3b. Although detailed illustration is omitted, the roller drive unit 3b includes a power source such as a motor and a torque transmission mechanism such as a gear unit. A torque transmission mechanism connects at least one of the first drive rollers 11 and 12 to the power source. At least one of the first drive rollers 11 and 12 is rotationally driven by the roller drive unit 3b.

As shown in FIGS. 4 and 5 (b), the first inner peripheral joint roller 13 is provided at the end of the first inner peripheral drive roller 11 on the rear side (upper side in FIG. 4) of stretching. The first inner peripheral joint roller 13 is formed in a disk shape having a shorter axis than the first inner peripheral driving roller 11. Moreover, the first inner peripheral joint roller 13 can freely rotate around the same axis as the first inner peripheral driving roller 11.
As shown in FIG. 5B, a first outer peripheral joint roller 14 is provided at the end of the first outer peripheral drive roller 12 on the rear side (right side in the figure) of stretching. The first outer peripheral joint roller 14 is formed in a disk shape having a shorter axis than the first outer peripheral drive roller 12. In addition, the first outer peripheral joint roller 14 can freely rotate coaxially with the first outer peripheral drive roller 12. The first joint rollers 13 and 14 are separated from each other on the inner peripheral side (upper side in FIG. 5 (b)) and the outer peripheral side (lower side in FIG. 5 (b)) and face each other.

As shown in FIGS. 4 and 5 (b), between the first joint rollers 13 and 14, the joint 91 g between the edges adjacent to each other at the extension front end portion 91e of the leading spiral pipe portion 91, that is, the fitting portion. 23 and 24 are sandwiched. The first inner peripheral joint roller 13 straddles the seam 91 g from the inner peripheral side (upper side in FIG. 5B). The first outer peripheral seam roller 14 straddles the seam 91 g from the outer peripheral side (lower side in FIG. 5B).

As shown in FIGS. 3 and 4, the second drive roller pair 20 is displaced to the rear side (right side in FIG. 3) of the pipe making device 3 in the propulsion direction with respect to the first drive roller pair 10, and the pipe making device. 3 is arranged so as to be offset to the rear side of stretching (upper side in FIG. 4) along the width direction of 3. As shown in FIG. 3, the second drive roller pair 20 has a second inner peripheral drive roller 21 and a second outer peripheral drive roller 22. These second drive rollers 21 and 22 are separated from each other on the inner peripheral side (upper side in FIG. 3) and the outer peripheral side (lower side in FIG. 3) and face each other in parallel. As shown in FIG. 5 (c), the rotation axes L ₂₁ and L ₂₂ of the second drive rollers ₂₁ and ₂₂ are both directed in the width direction (left-right direction in the figure) of the pipe making device 3. The rotation axes L ₂₁ and L _{22 of} the second drive rollers 21 and ₂₂ and the rotation axes L ₁₁ and L _{12 of} the first drive rollers 11 and ₁₂ are parallel to each other.

As shown in FIGS. 4 and 5 (c), the second inner peripheral drive roller 21 has a cylindrical shape having a length substantially the same as the width of the strip-shaped member 90. As shown in FIG. 5C, the second outer peripheral drive roller 22 extends parallel to the second inner peripheral drive roller 21 and by substantially the same length as the second inner peripheral drive roller 21. A locking flange 22f is provided on the peripheral side of the second outer peripheral drive roller 22.

As shown in FIG. 2, the second drive roller pair 20 is arranged at a peripheral portion 91d of the leading spiral pipe portion 91, which is deviated by one pitch from the continuous portion 91c to the extension rear side. As shown in FIG. 5B, the second outer peripheral drive roller 22 and the second inner peripheral drive roller 21 sandwich the portion 91d. In other words, the second drive roller pair 20 sandwiches the portion 91d wound before the sandwiching portion 91c of the first drive roller pair 10 in the strip-shaped member 90.
Further, the locking flange 22f enters the groove 95b and is locked. The locking flange 22f is relatively slidable in the extending direction of the groove 95b (the direction orthogonal to the paper surface in FIG. 5C), and is restricted from moving in the width direction of the groove 95b (the left-right direction in FIG. 5C). There is.

Although detailed illustration is omitted, the torque transmission mechanism of the roller drive unit 3b is connected to at least one of the second drive rollers 21 and 22. At least one of the second drive rollers 21 and 22 is rotationally driven by the roller drive unit 3b.
Moreover, the roller drive unit 3b can rotationally drive the first drive roller pair 10 and the second drive roller pair 20 at different rotational speeds.

As shown in FIGS. 4 and 5 (c), a second inner peripheral joint roller 23 is provided at the end of the second inner peripheral drive roller 21 on the extension front side (lower side in FIG. 4). The second inner peripheral joint roller 23 is formed in a disk shape having a shorter axis than the second inner peripheral driving roller 21. In addition, the second inner peripheral joint roller 23 can freely rotate coaxially with the second inner peripheral driving roller 21.
As shown in FIG. 5 (c), a second outer peripheral joint roller 24 is provided at the end of the second outer peripheral drive roller 22 on the front side (left side in the figure) of stretching. The second outer peripheral joint roller 24 is formed in a disk shape having a shorter axis than the second outer peripheral drive roller 22. In addition, the second outer peripheral joint roller 24 can freely rotate coaxially with the second outer peripheral drive roller 22. The second joint rollers 23 and 24 are separated from each other on the inner peripheral side (upper side in FIG. 5C) and the outer peripheral side (lower side in FIG. 5C) and face each other.

As shown in FIG. 4, the second joint rollers 23 and 24 are arranged on the joint 91 g of the leading spiral pipe portion 91 on the propulsion rear side (right side in FIG. 4) of the first joint rollers 13 and 14. As shown in FIG. 5 (c), the second inner peripheral joint roller 23 straddles the seam 91 g from the inner peripheral side (upper side in FIG. 5 (c)). The second outer peripheral seam roller 24 straddles the seam 91 g from the outer peripheral side (lower side in FIG. 5C). A joint 91 g (fitting portions 23, 24) of the leading spiral pipe portion 91 is sandwiched between the second joint rollers 23, 24.

The existing pipe 1 is rehabilitated by the pipe making device 3 as follows.
As shown in FIG. 1, it is assumed that the leading spiral pipe portion 91 is formed to some extent in the existing pipe 1. The trailing band portion 92 of the band-shaped member 90 is introduced into the pipe making device 3 of the extension front end portion 91e from the starting manhole 4 through the inside of the leading spiral pipe portion 91.
The first drive is performed by the roller drive unit 3b in a state where the continuous portion 91c is sandwiched by the first drive roller pair 10 and the portion 91d deviated by approximately one pitch from the continuous portion 91c is sandwiched by the second drive roller pair 20. The roller pair 10 and the second drive roller pair 20 are rotationally driven, respectively. As a result, the pipe making device 3 can be propelled (self-propelled) toward the propulsion front side. Along with the propulsion, the trailing band portion 92 is sequentially sent between the first drive rollers 11 and 12. Then, the second fitting portion 94 of the succeeding band portion 92 in the continuous portion 91c is fitted and joined with the first fitting portion 93 adjacent to the leading spiral pipe portion 91 by one circumference.
By sandwiching these fitting portions 93 and 94 with the first joint rollers 13 and 14, the fitting (joining) can be reliably performed. After that, by sandwiching the fitting portions 93, 94 with the second joint rollers 23, 24, the fitting can be more reliably fitted.
As a result, the leading spiral tube portion 91 can be stretched forward. As a result, the rehabilitation pipe 9 can be manufactured along the inner wall of the existing pipe 1.
By locking the locking flanges 12f and 22f to the grooves 95b at two locations separated from each other in the longitudinal direction of the groove 95b, the pipe making device 3 is rotated by a moment from the band-shaped member 90 or the band-shaped member 90. It can be prevented from falling off from.

Further, according to the pipe making device 3, by adjusting the relative rotation speeds of the first drive roller pair 10 and the second drive roller pair 20, the circumference of the extending front end portion 91e of the leading spiral pipe portion 91 is about one circumference. Can be variably adjusted, and the extension / contraction front end portion 91e can be expanded / contracted.
Specifically, in the starting-side constant diameter portion 1a of the existing pipe 1, the first drive roller pair 10 and the second drive roller pair 20 are rotated at a constant speed with each other. As a result, the leading spiral pipe portion 91 can be manufactured so as to have a constant diameter corresponding to the diameter of the starting side constant diameter portion 1a.
When the pipe making device 3 enters the diameter changing portion 1b from the starting side constant diameter portion 1a of the existing pipe 1, the roller driving unit 3b sets the rotation speed of the first driving roller pair 10 to the second driving roller pair 20. Make it faster than the rotation speed. As a result, the amount of feed of the trailing band portion 92 by the first drive roller pair 10 exceeds the amount of advance of the pipe making device 3 toward the propulsion front side. As a result, the diameter of the extended front end portion 91e of the leading spiral pipe portion 91 can be expanded along the diameter changing portion 1b.
When the pipe making device 3 enters the large diameter portion 1c of the existing pipe 1, the roller drive unit 3b returns the rotation speeds of the first drive roller pair 10 and the second drive roller pair 20 to the same speed. As a result, the leading spiral tube portion 91 can be manufactured so as to have a constant diameter corresponding to the diameter of the large diameter portion 1c.
When the pipe making device 3 enters the diameter change portion 1d from the large diameter portion 1c of the existing pipe 1, the rotation speed of the first drive roller pair 10 is changed to the rotation speed of the second drive roller pair 20 by the roller drive unit 3b. Slower than. As a result, the amount of feed of the trailing band portion 92 by the first drive roller pair 10 is less than the amount of advance of the pipe making device 3 toward the propulsion front side. As a result, the diameter of the extended front end portion 91e of the leading spiral pipe portion 91 can be reduced along the diameter changing portion 1d.
When the pipe making device 3 enters the arrival side constant diameter portion 1e of the existing pipe 1, the roller drive unit 3b returns the rotational speeds of the first drive roller pair 10 and the second drive roller pair 20 to the same speed. .. As a result, the leading spiral pipe portion 91 can be manufactured so as to have a constant diameter corresponding to the diameter of the arrival side constant diameter portion 1e.
As described above, according to the pipe making device 3, the diameter of the rehabilitation pipe 9 can be expanded or reduced by a simple configuration even if there is no inner circumference restricting body with an actuator for expansion / contraction (see Patent Documents 1 and 2 above). It is possible to make a pipe while doing it.

When the expansion / contraction operation is performed by the first drive roller pair 10 and the second drive roller pair 20, the one-circle difference portion of the leading spiral tube portion 91 is relatively slid. At this time, by freely rotating the first joint rollers 13 and 14 and the second joint rollers 23 and 24, it is possible to prevent a large frictional resistance from acting. Therefore, the relative slide and thus the expansion / contraction operation can be smoothly performed.

Next, other embodiments 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>
6 to 8 show a second embodiment of the present invention. In the pipe making device 3B of the second embodiment, the second drive roller pair 20 is arranged so as to be offset from the first drive roller pair 10 only in the width direction of the propulsion direction and the width direction of the pipe making device 3B. ing. That is, the first drive roller pair 10 and the second drive roller pair 20 are arranged side by side in the width direction of the pipe making device 3B.

As shown in FIG. 6, the first drive roller pair 10 is arranged in a continuous portion 91c of the trailing strip portion 92 and the leading spiral pipe portion 91 in the strip-shaped member 90. The first drive rollers 11 and 12 sandwich the continuous portion 91c from the inner peripheral side and the outer peripheral side.
As shown in FIG. 7, the second drive roller pair 20 is arranged at a portion 91d'of the leading spiral tube portion 91 that is exactly one pitch offset from the continuous portion 91c to the rear side of the extension. As shown in FIG. 8B, the second drive rollers 21 and 22 sandwich the portion 91d'with a deviation of one pitch from the inner peripheral side and the outer peripheral side.

7 and 8 (b), a first inner peripheral driving roller 11 and the second inner peripheral drive roller 21 is disposed on the same rotation axis L _1. An inner peripheral joint roller 13B is sandwiched between the inner peripheral drive rollers 11 and 21. The inner peripheral joint roller 13B straddles the joint 91g of the extended front end portion 91e of the leading spiral pipe portion 91 from the inner peripheral side (in front of the paper in FIG. 7).
As shown in FIG. 8 (b), the first outer peripheral driving roller 12 and the second outer peripheral driving roller 22 is disposed on the same rotation axis L _2. An outer peripheral joint roller 14B is sandwiched between the outer peripheral drive rollers 12 and 22. The outer peripheral seam roller 14B straddles the seam 91g from the outer peripheral side (lower side in FIG. 8B).

Further, the first drive roller pair 10 and the second drive roller pair 20 can be rotationally driven at different speeds by the roller drive unit 3b. The seam rollers 13B and 14B can rotate freely.
By adjusting the relative rotation speed between the drive rollers 10 and 20, the circumference of the stretched front end portion 91e of the leading spiral tube portion 91 can be variably adjusted, and the stretched front end portion 91e can be expanded or contracted.
By sandwiching the seam 91g between the seam rollers 13B and 14B, the fitting portions 93 and 94 can be reliably fitted. In addition, by allowing the seam rollers 13B and 14B to rotate freely, it is possible to smoothly perform the relative sliding between the portions of the leading spiral tube portion 91 that are different from each other during the expansion / contraction operation.

As shown in FIG. 6, the guide member 30 is arranged on the propulsion front side (left side in FIG. 6) of the drive roller pairs 10 and 20. The guide member 30 has a plate shape, and its longitudinal direction is directed to the width direction of the pipe making device 3B. The width direction of the guide member 30 is directed to the propulsion direction of the pipe making device 3B.

As shown in FIG. 8A, the end of the guide member 30 on the rear side of stretching (right side in the same figure) in the longitudinal direction is on the outer peripheral side (lower side in FIG. 6) with respect to the front end of stretching 91e of the leading spiral tube portion 91. ) Is addressed.
A locking portion 32 is provided at the end portion of the guide member 30 on the rear side of the extension (the right end portion in FIG. 8A) so as to project toward the inner peripheral side (upper side in FIG. 8A). There is. The locking portion 32 is locked in the groove 95b. The locking portion 32 is slidable in the longitudinal direction of the groove 95b (the direction orthogonal to the paper surface in FIG. 8A) and is restricted from moving in the width direction of the groove 95b (the left-right direction in FIG. 8A). ..
The locking flanges 12f and 22f and the locking portion 32 are locked in the groove 95b at two locations separated from each other in the longitudinal direction of the groove 95b, whereby the pipe making device 3B is rotated by the moment from the strip-shaped member 90. It is possible to prevent it from slipping or falling off from the strip-shaped member 90.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the present invention is not limited to corresponding to the expansion / contraction diameter of the inner wall of the existing pipe 1, and can be applied to the case where the inner wall of the existing pipe 1 has a convex portion or a concave portion such as an obstacle. For example, when there is an obstacle (convex portion), the obstacle can be avoided by reducing the diameter of the rehabilitation pipe 9 by the pipe making devices 3 and 3B. If there is a recess, the diameter of the rehabilitation pipe 9 can be increased by the pipe making devices 3 and 3B so that the rehabilitation pipe 9 can be aligned with the recess.
Further, the present invention is not limited to the one in which the rehabilitation pipe 9 (spiral pipe) is lined on the existing pipe 1, and can be applied to the production of various spiral pipes.
The first drive roller pair 10 may be arranged in a peripheral portion of the strip-shaped member 90 so as to be slightly deviated from the continuous portion 91c of the trailing strip portion 92 and the leading spiral pipe portion 91. The first inner peripheral drive roller 11 and the first outer peripheral drive roller 12 may sandwich the peripheral portion of the continuous portion 91c. That is, the first drive roller pair 10 may be set on the trailing band portion 92. Alternatively, the first drive roller pair 10 may be set on the leading spiral tube portion 91 on the propulsion rear side of the continuous portion 91c.
The second drive roller pair 20 may be arranged with respect to the first drive roller pair 10 only in the propulsion direction of the pipe making device.
The seam roller may be attached to at least one of the first drive rollers 11 and 12 and the second drive rollers 21 and 22.
The number of drive roller pairs is not limited to two, and may be three or more. One of the three or more drive roller pairs may constitute the first drive roller pair 10, and the other one may form the second drive roller pair 20.
The pipe making devices 3 and 3B may have an inner circumference restricting body.

The present invention can be applied to rehabilitation techniques such as sewer pipes, water pipes, and agricultural water pipes.

1 Existing pipe 4 Starting manhole 4B Reaching manhole 1a Starting side constant diameter part 1b Diameter changing part 1c Large diameter part 1d Diameter changing part 1e Reaching side constant diameter part 9 Rehabilitation pipe (spiral pipe)
90 Band-shaped member 90a Band body 91 Leading spiral tube part 91c Continuous part (Pinching point of the first drive roller pair)
91d, 91d'Second drive roller pair sandwiching location (previously wound location)
91e Stretched front end 91g Seam 92 Subsequent band 93 1st fitting 94 2nd fitting 95b Groove 96 Reinforcing band 3,3B Pipe making device 3a Device frame 3b Roller drive 10 1st drive roller pair 11 1st Inner circumference drive roller 12 First outer circumference drive roller 12f Locking flange 13 First inner circumference seam roller (seam roller)
13B Inner circumference seam roller (seam roller)
14 First outer peripheral seam roller (seam roller)
14B Outer outer seam roller (seam roller)
20 Second drive roller pair 21 Second inner circumference drive roller 22 Second outer circumference drive roller 22f Locking flange 23 Second inner circumference joint roller (seam roller)
24 Second outer peripheral seam roller (seam roller)
30 Guide member 32 Locking part L ₁₁ , L ₁₂ Rotation axis L ₂₁ , L ₂₂ Rotation axis L ₁ , L ₂ Rotation axis

Claims (4)

A pipe-making device that forms a spiral tube by joining edges adjacent to each other around the strip-shaped member while spirally winding the strip-shaped member with propulsion.
A first drive roller pair that sandwiches the strip-shaped member with the rotation axis directed in the width direction orthogonal to the propulsion direction, and
The rotation axis is oriented in the width direction and is arranged so as to be offset from the first drive roller pair in at least one of the propulsion direction and the width direction, and the first drive roller pair is sandwiched between the strip-shaped members. The second drive roller pair that sandwiches the wound part before the attachment part,
A roller drive unit capable of rotationally driving the first drive roller pair and the second drive roller pair at different rotational speeds,
The pipe making device is characterized in that the propulsion amount or propulsion speed of the pipe making device is controlled by the rotation speed of the second drive roller pair . The first drive roller pair is a continuous portion between a leading spiral tube portion formed in a spiral shape in advance in the strip-shaped member and a succeeding band portion following the leading spiral tube portion , or the manufacturing in the succeeding band portion. The pipe making device according to claim 1, wherein a portion introduced into the pipe device is sandwiched. A portion of the second drive roller pair at the front end in the extending direction along the axis of the preceding spiral pipe portion , where the pipe making device is arranged , behind the first drive roller pair in the propulsion direction. or manufactured according to claim 2, characterized in that pinching the portion from the continuous portion shifted exactly one pitch to the rear side of the stretching direction, or the offset into the exactly one pitch shift said propulsion direction from the point locations Tube device. At the end of at least one of the first drive roller pair and the second drive roller pair, there is a gap between edges adjacent to each other of the leading spiral tube portion formed in a spiral shape in advance of the strip-shaped member. The pipe making device according to any one of claims 1 to 3, wherein a seam roller straddling the seam is provided so as to be freely rotatable around coaxially with the one roller.

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