Pipe forming device for rehabilitation pipe

Abstract

To provide a self-propelled pipe forming device capable of surely avoiding interference with a projecting uneven part when there is the projecting uneven part such as a projecting part and a level difference on an inner peripheral surface of an existing pipe on a propulsion front side.SOLUTION: A pipe forming device 20 is advanced in a spiral winding direction while forming a spiral tubular rehabilitation pipe 9 from a strip-shaped member 10 along an inner peripheral surface 1b of an existing pipe 1. The pipe forming device 20 includes: a device body 21 arranged at a pipe end 9e on an extension front side in an axial direction of the rehabilitation pipe being formed; drive rollers 24, 25 that sandwich a subsequent band portion 19 of an unrefined pipe in the strip-shaped member 10 and push it obliquely toward the pipe end 9e; a pipe end guide 23 engaged with the pipe end 9e so as to be slidable in the spiral winding direction; a front guide roller 40 and a rear guide roller 30 spaced apart in a longitudinal direction LD in the body 21. The front guide roller 40 is shifted rearward relative to the rear guide roller 30.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a pipe manufacturing device that manufactures a spiral-shaped rehabilitation pipe from a strip-shaped material along the inner circumference of an existing pipe, and in particular to a self-propelled pipe manufacturing device that manufactures pipe while being propelled (self-propelled) in the spiral winding direction. [Background technology]

[0002] For example, a method for rehabilitating an existing pipe, such as a sewer pipe, by lining the inner periphery of the pipe with a spiral-shaped rehabilitation pipe made of a long, strip-shaped member is known (see Patent Document 1, etc.). Patent Document 1 discloses a self-propelled pipe-making device for producing a rehabilitated pipe. The pipe-making device includes a device main body disposed at the end of the rehabilitated pipe on the front side in the axial direction of the pipe, and a pair of drive rollers and a pipe end guide attached to the device main body. The pipe end guide is engaged with the pipe end so as to be slidable in the spiral winding direction. The drive rollers sandwich a trailing band portion of the unrehabilitated pipe following the pipe end of the strip-shaped member and push it obliquely into the pipe end, thereby incorporating the trailing band portion into the pipe end, and the pipe-making device is propelled in the spiral winding direction by the reaction force of the pushing. This progresses the production of the rehabilitated pipe. The pipe end guide on the front side of the propulsion is equipped with a brake mechanism that applies a braking force when pressed against the pipe end. By adjusting the braking force, the diameter of the rehabilitated pipe can be expanded or contracted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-084728 Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of rehabilitation method, in which a self-propelled pipe-making machine is used to weave a spiral-shaped rehabilitated pipe along the inner circumference of an existing pipe, if there are convex irregularities, such as bumps or steps, on the inner surface of the existing pipe ahead of the pipe-making machine, the pipe end guide or brake mechanism installed at the forward end of the pipe-making machine may interfere with the convex irregularities, causing the pipe-making machine to stop advancing. In particular, in a pipe-attachment method, in which the rehabilitated pipe is attached to the inner surface of the existing pipe, the distance between the pipe-making machine and the existing pipe is very close, making interference more likely. In such cases, a tool such as a crowbar is used to tilt the width direction of the pipe-making machine along the axis of the rehabilitated pipe toward the inner circumference of the pipe (inward in the pipe diameter direction) toward the forward extension side, allowing the pipe-making machine to overcome the convex irregularities. However, at this time, the extended front side of the pipe end guide or brake mechanism may be close to and facing the step surface of the convex uneven portion, and in such a case, the pipe end guide or brake mechanism may be pressed hard against or get caught on the step surface, making it impossible to tilt the pipe making device and to operate it to overcome the convex uneven portion. In consideration of the above circumstances, the present invention aims to provide a self-propelled pipe making device that can reliably avoid interference with convex unevenness such as a protrusion or step on the inner surface of an existing pipe on the front side of the thrust. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides a pipe manufacturing device that manufactures a spiral-shaped rehabilitation pipe made of a strip-shaped member along the inner periphery of an existing pipe while propelling the pipe in a spiral winding direction, an apparatus main body disposed at a pipe end portion on the front side in the axial direction of the rehabilitating pipe during pipe manufacturing, with its longitudinal direction facing the spiral winding direction and movable in the spiral winding direction; a drive roller provided in the device body for sandwiching a subsequent band portion of the unfinished pipe following the pipe end portion of the band-shaped member and pushing it obliquely toward the pipe end portion; one or more tube end guides provided in the device body and slidably engaged with the tube end in the spiral winding direction; and a front guide roller protruding from a side portion of the device body on the forward side in the longitudinal direction toward the forward side in the extension direction; a rear guide roller protruding from a side portion of the device body rearward of the front guide roller toward the extension front side; The first feature of the present invention is that the front guide roller is disposed at a position shifted rearward in the stretching direction relative to the rear guide roller.

[0006] When there is a convex unevenness, such as a protrusion or step, on the inner circumferential surface of the existing pipe forward of the pipe making device, the front guide roller rolls against the convex unevenness and rides over the convex unevenness as the pipe making device is advanced. This causes the width direction of the pipe making device to tilt toward the inner circumferential surface of the pipe toward the front of the extension relative to the pipe axis of the existing pipe, and the side of the pipe end guide on the front side of the extension is oriented toward the inner circumferential surface of the pipe rather than the step surface of the convex unevenness. By shifting the position of the front guide roller rearward of the extension relative to the rear guide roller, the degree of inclination of the pipe making device can be made greater than when the rear guide roller rides over the convex unevenness. As a result, the side of the pipe end guide on the front side of the extension can be reliably oriented toward the inner circumferential surface of the pipe rather than the step surface of the convex unevenness. Therefore, the operation of tilting the width direction of the pipe making device along the rehabilitation pipe axis toward the inner periphery of the pipe (inward in the pipe diameter direction) toward the front side of the extension in order to overcome the convex unevenness can be omitted or simplified. Furthermore, when performing the tilting operation, the side surface of the pipe end guide on the front side of the extension can be prevented from being pressed strongly against or getting caught on the step surface of the convex unevenness. This prevents the pipe making device from interfering with the convex unevenness and stopping, and allows pipe making to overcome the convex unevenness.

[0007] Preferably, the distance along the longitudinal direction from the front tube end guide, which is located furthest forward among the tube end guides, to the front guide roller is shorter than the distance along the longitudinal direction from the front tube end guide to the rear guide roller. This ensures that if there is a convex uneven portion on the forward side of the propulsion, the front guide roller will ride up onto the convex uneven portion, thereby preventing the front tube end guide from being pressed hard against or getting caught on the stepped surface of the convex uneven portion.

[0008] Preferably, the front guide roller is disposed near the forward side of the front tube end guide. This allows the front guide roller to reach the convex uneven portion before the front tube end guide reaches the convex uneven portion, causing the tube making device to tilt, thereby reliably preventing the front tube end guide from being pressed hard against or getting caught on the step surface of the convex uneven portion.

[0009] Preferably, the front tube end guide includes a brake mechanism that exerts a braking force when pressed against the tube end. By adjusting the braking force, the diameter of the rehabilitated pipe can be adjusted. The front guide roller prevents the brake mechanism from getting caught on uneven convex portions.

[0010] The present invention relates to a pipe manufacturing device that manufactures a spiral-shaped rehabilitation pipe made of a strip-shaped member along the inner periphery of an existing pipe while propelling the pipe in a spiral winding direction, an apparatus main body disposed at a pipe end portion on the front side in the axial direction of the rehabilitating pipe during pipe manufacturing, with its longitudinal direction facing the spiral winding direction and movable in the spiral winding direction; a drive roller provided in the device body for sandwiching a subsequent band portion of the unfinished pipe following the pipe end portion of the band-shaped member and pushing it obliquely toward the pipe end portion; a tube end guide provided in the device body and engaged with the tube end so as to be slidable in the spiral winding direction; a brake mechanism provided in the device body and pressed against the pipe end to generate a braking force; a front guide roller protruding from the vicinity of the forward propulsion side of the brake mechanism in the device body toward the forward extension side; The second feature is that it has the following. As a result, when the inner circumferential surface of the existing pipe ahead of the pipe making device encounters a convex unevenness, such as a protrusion or step, the front guide roller rides up on the convex unevenness, tilting the width direction of the pipe making device toward the inner circumferential surface of the pipe toward the front of the extension relative to the pipe axis of the existing pipe, so that the side of the pipe end guide on the front side of the extension can be oriented toward the inner circumferential surface of the pipe rather than the step of the convex unevenness. This allows the side of the pipe end guide and brake mechanism on the front side of the extension to be oriented toward the inner circumferential surface of the pipe rather than the step of the convex unevenness. Therefore, tilting the pipe making device using a tool such as a crowbar to overcome the convex unevenness can be omitted or simplified. Even if the tilting operation is performed, the side of the pipe end guide and brake mechanism on the front side of the extension can be prevented from being pressed strongly against or getting caught on the step of the convex unevenness. As a result, pipe making can be performed while overcoming the convex unevenness.

[0011] Preferably, the front guide roller has a conical shape whose diameter decreases toward the stretching front side. This allows the front guide roller to reliably ride over any uneven convex portions such as bumps or steps on the inner surface of the existing pipe on the forward side of the pipe making machine. [Effects of the Invention]

[0012] According to the present invention, when producing a rehabilitated pipe using a self-propelled pipe-making device, if there is a convex uneven portion such as a protrusion or step on the inner surface of the existing pipe on the front side of the pipe, the pipe can be produced so as to overcome the convex uneven portion. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a side cross-sectional view illustrating the process of rehabilitating an existing pipe by producing a rehabilitating pipe from a strip-shaped member using a pipe producing apparatus according to one embodiment of the present invention. [Figure 2] FIG. 2 is a front cross-sectional view of the pipe manufacturing apparatus during the rehabilitation work of the existing pipe, taken along line II-II in FIG. [Figure 3] FIG. 3 is an explanatory plan view of the pipe making apparatus. [Figure 4]4 is a side cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a side cross-sectional view showing a state in which the front guide roller of the pipe making device has climbed onto a convex uneven portion on the inner peripheral surface of an existing pipe. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, the present invention is applied to, for example, the rehabilitation of an existing aged pipe 1. The existing pipe 1 is rehabilitated by lining the inner periphery of the existing pipe 1 with a rehabilitation pipe 9. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried underground. The inner periphery 1b of the existing aged pipe 1 may have convex uneven portions 1d such as protrusions and steps. The existing pipes to be rehabilitated are not limited to sewerage pipes, but may also include water supply pipes, agricultural water pipes, gas pipes, hydroelectric power generation water pipes, tunnels, etc.

[0015] As shown in Figures 1 and 2, the rehabilitation pipe 9 is a helical pipe formed by helically winding a strip-shaped member 10 (profile). As shown in Figure 4, the strip-shaped member 10 is made of a synthetic resin such as polyvinyl chloride and extends long in the strip length direction (the direction perpendicular to the plane of the paper in Figure 4). Concave, convex, or uneven fitting portions 13, 14 are formed on both edges of the strip-shaped member 10 in the strip width direction (the left-right direction in Figure 4). The cross-sectional shape of the belt-shaped member 10 can be modified as appropriate.

[0016] As shown in Figures 2 and 4, a strip-shaped member 10 is wound spirally around the inner circumference of the existing pipe 1, and the fitting portions 13, 14 of adjacent edges that are one turn apart are joined together by a concave-convex fitting, thereby constructing a spiral tubular rehabilitation pipe 9.

[0017] As shown in Figure 1, the rehabilitated pipe 9 (helical pipe) is produced by a so-called self-propelled pipe making device 20. The pipe making device 20 is arranged at the pipe end 9e on the front side (right side in Figure 1) of the extending pipe axial direction (left and right direction in Figure 1) of the rehabilitated pipe 9. A subsequent strip portion 19 of unmade pipe in the strip-shaped member 10 is unwound from a drum (not shown) on the ground, passes through the starting manhole 4 and the inside of the rehabilitated pipe 9 (the previously made pipe portion in the strip-shaped member 10), and is introduced into the pipe making device 20 on the pipe end 9e.

[0018] As shown schematically in Figure 3, the pipe making device 20 includes an apparatus main body 21, a drive unit 22, and a pipe end guide 23. As shown in Figure 2, the apparatus main body 21 is formed in a frame or housing shape, and is arranged on the inner side of the rehabilitating pipe end 9e so as to be movable in the spiral winding direction of the rehabilitating pipe 9. The dimension of the longitudinal direction LD of the apparatus main body 21 along the spiral winding direction or circumferential direction of the rehabilitating pipe 9 is approximately one-several to one-several tenths of the circumferential length of the rehabilitating pipe 9. The apparatus main body 21 is not provided with an inner circumference regulating body such as a link roller that regulates the pipe end 9e from the inner circumference side, and the pipe end 9e other than where the apparatus main body 21 is arranged is open to the inner circumference side.

[0019] 2 and 4, a drive unit 22 is provided in the device body 21. The drive unit 22 includes at least one pair (here, two pairs) of drive rollers 24, 25 and a drive motor 22a. The axes of the drive rollers 24, 25 are oriented in the width direction WD, which is perpendicular to the longitudinal direction LD of the device body 21. The drive motor 22a is connected to the drive roller 24 via a torque transmission mechanism 22b, such as a gear, so as to be able to transmit torque. The device width direction WD is approximately aligned with the pipe axis direction of the rehabilitating pipe 9, and strictly speaking, is angled with respect to the pipe axis direction by the helical lead angle of the rehabilitating pipe 9.

[0020] As shown in FIG. 2, one or more tube end guides 23 are provided at the bottom of the device body 21 in the height direction HD. The device height direction HD is oriented along the pipe diameter direction or the inner / outer direction of the rehabilitating pipe 9.

[0021] The multiple tube end guides 23 are arranged spaced apart from one another in the longitudinal direction LD of the device body 21. As shown in Figure 3, of the multiple tube end guides 23, the tube end guide 23A arranged furthest forward in terms of propulsion (on the right side in Figure 3) is provided on an arm portion 21a extending forward in terms of propulsion from the drive unit 22 of the device body 21.

[0022] 4, each pipe end guide 23 is engaged with the pipe end 9e so as to be slidable in the spiral winding direction of the rehabilitating pipe 9. Preferably, the pipe end guide 23 includes a locking claw 23b engaged with the outer circumferential groove 16 of the pipe end 9e.

[0023] As shown in Figures 2 and 4, at least one tube end guide 23 is equipped with a brake mechanism 26. Preferably, the tube end guide 23A on the forward side of the tube end 9e includes the brake mechanism 26. The brake mechanism 26 includes a brake shoe 26a that can be pressed against the inner circumferential surface of the tube end 9e, and an adjustment mechanism 26b that adjusts the pressing force of the brake shoe 26a. The locking claw 23b of the tube end guide 23A forms a brake guide that faces the brake shoe 26a across the tube end 9e. Braking force is generated when the brake shoe 26a is pressed against the tube end 9e.

[0024] 2 and 3, the pipe making device 20 is further provided with two (or more) conical guide rollers 30, 40 for climbing over uneven portions 1d such as convex portions and steps on the inner surface 1b of the existing pipe 1. These guide rollers 30, 40 are arranged apart in the longitudinal direction LD of the pipe making device 20 and offset in the width direction WD.

[0025] The rear guide roller 30 is disposed at a distance rearward in the propulsion direction (leftward in FIG. 3) from the front guide roller 40, on a side facing the extension front side (downward in FIG. 3) in the middle of the device body 21. The rear guide roller 30 protrudes from the device body 21 in the extension front side (downward in FIG. 3) and has a conical shape with a diameter that decreases in the protruding direction.

[0026] The rear guide roller 30 is rotatably supported on the device body 21 via a bearing 31. The height of the bearing 31 and therefore the rear guide roller 30 can be adjusted in the device height direction HD by a height adjustment mechanism 32. Preferably, the rear guide roller 30 is adjusted to a height that allows it to roll in contact with the inner circumferential surface 1b of the existing pipe 1.

[0027] As shown in Figures 2 and 3, a front guide roller 40 is provided on the forward side of the rear guide roller 30 in the pipe making device 20 (to the right in Figure 3). The front guide roller 40 is located on the side facing the forward extension side (downward in Figure 3) of the forward extension arm portion 21a of the device main body 21. The front guide roller 40 protrudes from the arm portion 21a in the forward extension side (downward in Figure 3) and has a conical shape with a diameter that decreases in the protruding direction.

[0028] The front guide roller 40 is rotatably supported on the device body 21 via a bearing 41. The height of the bearing 41 and therefore the front guide roller 40 can be adjusted in the device height direction HD by a height adjustment mechanism 42. Preferably, the front guide roller 40 is adjusted to a height that allows it to contact the inner peripheral surface 1b of the existing pipe 1 and roll on the inner peripheral surface 1b.

[0029] As shown in Fig. 3, when viewed in the device height direction HD, the front guide roller 40 is positioned further rearward in the width direction WD (upper in Fig. 3) than the rear guide roller 30. Preferably, the front guide roller 40 is positioned near the forward thrust side and the forward extension side of the front tube end guide 23A and the brake mechanism 26. A distance L40 from the front tube end guide 23A and the brake mechanism 26 to the front guide roller 40 in the longitudinal direction LD is shorter than a distance L30 from the front tube end guide 23A and the brake mechanism 26 to the rear guide roller 30 in the longitudinal direction LD. A distance D40 from the front tube end guide 23A and the brake mechanism 26 to the front guide roller 40 in the width direction WD is shorter than a distance D30 from the front tube end guide 23A and the brake mechanism 26 to the rear guide roller 30 in the width direction WD.

[0030] In the pipe making device 20, a pair of drive rollers 24, 25 clamp the trailing band portion 10 and are driven to rotate by a drive motor 22a. This causes the trailing band portion 19 to be pushed obliquely toward the pipe end 9e, and the opposing mating portions 13, 14 of the pipe end 9e and the trailing band portion 19 are mated together. In this way, the pipe making process progresses. In addition, the reaction force from the pushing propels (self-propels) the pipe making device 20 in a counterclockwise spiral winding direction in Figure 2 along the inner circumference of the existing pipe 1.

[0031] Preferably, the brake shoe 26a of the brake mechanism 26 is pressed against the pipe end 9e to generate a braking force. This causes the speed at which the trailing band 10 is fed to the pipe end 9e by the drive rollers 24, 25 to be greater than the forward speed of the pipe making device 20. As a result, the rehabilitating pipe 9 is expanded in diameter and made so that it is attached to the entire inner surface 1b of the existing pipe 1.

[0032] As shown in Figure 5, when there is a convex unevenness 1d, such as a protrusion or step, on the inner surface 1b of the existing pipe ahead of the pipe making device 20, as the pipe making device 20 advances, the front guide roller 40 reaches the convex unevenness 1d before the front pipe end guide 23A and brake mechanism 26 and rides up the convex unevenness 1d while rolling. As a result, the width direction WD of the pipe making device 20 tilts toward the inner circumference of the pipe toward the front side of the extension with respect to the pipe axis of the existing pipe 1. Because the position of the front guide roller 40 is shifted rearward of the extension relative to the rear guide roller 30, the degree of tilt of the pipe making device 20 can be made greater than when the rear guide roller 30 rides up the convex unevenness 1d.

[0033] By tilting the pipe making device 20, the side surface 23f on the extending front side of the pipe end guide 23A, which includes the brake mechanism 26, is directed toward the inner periphery of the pipe (upper side in Figure 5) rather than the step surface 1da of the convex uneven portion 1d. The brake mechanism 26 or the front guide roller 40 near the pipe end guide 23A rides up onto the convex uneven portion 1d, thereby reliably tilting the side surface 23f on the extending front side toward the inner periphery of the pipe. Therefore, the operation of tilting the pipe making device 20 toward the inner circumference of the pipe using a tool such as a crowbar to overcome the convex unevenness 1d can be omitted or simplified. Furthermore, when performing the tilting operation, it is possible to avoid the brake mechanism 26 or the side surface 23f on the extended front side of the pipe end guide 23A being pressed hard against or caught on the step surface 1da of the convex unevenness 1d, making the tilting operation impossible. This makes it possible to prevent the pipe making device 20 from interfering with the convex uneven portion 1d and stopping, and to make a pipe so as to overcome the convex uneven portion 1d.

[0034] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the shape of the rear guide roller 30 is not limited to a conical shape, but may be a cylindrical shape. The shape of the front guide roller 40 is not limited to a conical shape, but may be a cylindrical shape. The brake mechanism may be omitted. The pipe making device may have an inner circumference regulating body such as a link roller. [Industrial Applicability]

[0035] The present invention can be applied to, for example, a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0036] 1 Existing pipes 1b Inner surface 1d Convex uneven part 1da step surface 9 Rehabilitation pipe (spiral pipe) 9e Tube end 10. Belt-shaped member 19 Trailing belt 20 Pipe making equipment 21 Device body 22 Drive unit 23 Pipe end guide 23A Pipe end guide located at the most forward thrust side 24,25 Drive roller 26 Brake mechanism 30 Rear guide roller 40 Front guide roller

Claims

1. In a pipe manufacturing device, a spiral-shaped rehabilitation pipe made of a strip-shaped member is manufactured along the inner periphery of an existing pipe while being propelled in a spiral winding direction. an apparatus main body disposed at a pipe end portion on the front side in the axial direction of the rehabilitating pipe during pipe manufacturing, with its longitudinal direction facing the spiral winding direction and movable in the spiral winding direction; a drive roller provided in the device body for sandwiching a subsequent band portion of the unfinished pipe following the pipe end portion of the band-shaped member and pushing it obliquely toward the pipe end portion; one or more tube end guides provided on the device body and slidably engaged with the tube end in the spiral winding direction; and a front guide roller protruding from a side portion of the device body on the forward side in the longitudinal direction toward the forward side in the extension direction; a rear guide roller protruding from a side portion of the device body rearward of the front guide roller toward the extension front side; wherein the front guide roller is positioned rearward of the rear guide roller in the stretching direction.

2. A pipe making apparatus as described in claim 1, wherein the distance along the longitudinal direction from the front pipe end guide located furthest forward among the pipe end guides to the front guide roller is shorter than the distance along the longitudinal direction from the front pipe end guide to the rear guide roller.

3. 3. A pipe making apparatus according to claim 2, wherein the front guide roller is disposed near the forward side of the front pipe end guide.

4. 3. A pipe making apparatus as described in claim 2, wherein the front pipe end guide includes a brake mechanism that exerts a braking force when pressed against the pipe end.

5. In a pipe manufacturing device, a spiral-shaped rehabilitation pipe made of a strip-shaped member is manufactured along the inner periphery of an existing pipe while being propelled in a spiral winding direction. an apparatus main body disposed at a pipe end portion on the front side in the axial direction of the rehabilitating pipe during pipe manufacturing, with its longitudinal direction facing the spiral winding direction and movable in the spiral winding direction; a drive roller provided in the device body for sandwiching a subsequent band portion of the unfinished pipe following the pipe end portion of the band-shaped member and pushing it obliquely toward the pipe end portion; a tube end guide provided in the device body and engaged with the tube end so as to be slidable in the spiral winding direction; a brake mechanism provided in the device body and pressed against the pipe end to generate a braking force; a front guide roller protruding from the vicinity of the forward propulsion side of the brake mechanism in the device body toward the forward extension side; A pipe making apparatus comprising:

6. A pipe making apparatus according to any one of claims 1 to 5, wherein the front guide roller has a conical shape whose diameter decreases toward the front side of the stretching.

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