Pipe making device for helical pipe

Abstract

To suppress a cross-sectional deformation of a subsequent strip part, when the subsequent strip part of a belt-like member is supplied to a pipe making device.SOLUTION: A pipe making device 20 is advanced in a spiral winding direction while producing a helical pipe 9 made of a belt-like member 10. The pipe making device 20 includes a drive roller unit 21 arranged on an inner periphery of a pipe end 9e on a front side of a pipe axial direction of a previously produced pipe part of the helical pipe 9, and a band guide arm 40. Rollers 25, 26 of the drive roller unit 21 clamp a subsequent band part 19 of an unproduced pipe of the belt-like member 10 following the pipe end 9e and push it toward an assembly point 9p located rearward in a spiral winding direction, thereby incorporating the subsequent band part 19 into the pipe end 9e. The band guide arm 40 extends from the drive roller unit 21 toward the assembly point 9p. A roller shaft 29 of the drive roller unit 21 is oriented obliquely with respect to an arm width direction W40, which is perpendicular to an arm extension direction L40 along the band guide arm 40.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an apparatus for producing a spiral pipe from a strip-shaped material, and more particularly to a pipe producing apparatus that is propelled (self-propelled) in the spiral winding direction while producing the pipe. [Background technology]

[0002] For example, a method for rehabilitating an existing pipe, such as a sewer pipe, by lining the inner wall of the pipe with a rehabilitation pipe is well known. An example of a rehabilitation pipe is a helical pipe formed by spirally winding a long strip-shaped member (profile) made of synthetic resin. Patent Document 1 discloses a self-propelled pipe-making device that produces a helical rehabilitated pipe while being propelled (self-propelled) in a spiral winding direction. The self-propelled pipe-making device includes a drive roller unit including at least a pair of drive rollers, and a band guide arm extending from the drive roller unit toward the rear side of the propulsion in the spiral winding direction (propulsion direction), and is disposed at the pipe end of the rehabilitated pipe (helical pipe) on the front side in the pipe axial direction. The roller axis of the drive roller and the extension direction of the band guide arm are perpendicular to each other.

[0003] A pair of drive rollers clamps the trailing band of the unprocessed pipe of the band-shaped member following the pipe end and pushes it backward along the band guide arm. As a result, the trailing band is incorporated into the pipe end of the rehabilitating pipe at the insertion point near the tip of the band guide arm, and the pipe production progresses. At the same time, a thrust reaction force is generated, propelling the pipe production device forward in the spiral winding direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-071364 Summary of the Invention [Problem to be solved by the invention]

[0005] In the rehabilitating pipe manufacturing method using the self-propelled pipe manufacturing machine, the trailing band of the band-shaped material is typically unwound from a drum on the ground and fed to the drive roller unit of the pipe manufacturing machine through a starting manhole and the interior of the rehabilitating pipe's already-rehabilitated pipe section. The trailing band must be fed at an appropriate feed angle relative to the drive roller unit. An inappropriate feed angle can cause cross-sectional deformation of the trailing band, such as crushing deformation, which can lead to poor fitting between the trailing band and the pipe end, derailment, and other pipe manufacturing defects. Such defects are more likely to occur with smaller pipe diameters. They are also more likely to occur when a curling device for curling the trailing band is omitted. Furthermore, in the case of a pipe manufacturing machine with an inner circumference open structure (i.e., an inner circumference without a ring-shaped inner circumference restrictor that runs along the inner circumference of the rehabilitating pipe), it is difficult to provide a guide along the path of the trailing band, making the above-mentioned defects more likely to occur. In view of the above circumstances, the present invention aims to stably produce a spiral pipe by supplying the subsequent band portion of a band-shaped member to the drive roller unit of a pipe producing device at an appropriate supply angle. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a pipe making device that produces a spiral pipe made of a strip-shaped member while propelling the spiral pipe in a spiral winding direction, a drive roller unit arranged on the inner circumferential side of the tube end portion on the front side in the axial direction of the previously produced tube portion of the helical tube, for clamping a subsequent band portion of the unproduced tube of the band-shaped member following the tube end portion, and for pushing the subsequent band portion into an assembly location distant from the rear side of the spiral winding direction, thereby assembling the subsequent band portion into the tube end portion; a band guide arm extending from the drive roller unit toward the installation location; The roller shaft of the drive roller unit is oriented obliquely with respect to the arm width direction perpendicular to the arm extension direction along the band guide arm.

[0007] The supply angle of the trailing band portion near the entrance to the pipe making device is usually angled with respect to the arm extension direction and arm width direction. The roller axis of the drive roller unit is aligned with this supply angle of the trailing band portion. Preferably, the roller axis is oriented as perpendicular as possible to the feed direction along the band length direction of the trailing band portion near the entrance to the pipe making device. Alternatively, the roller axis is oriented as parallel as possible to the twist direction along the band width direction of the trailing band portion near the entrance to the pipe making device. In this case, the roller axis is oriented obliquely with respect to the arm width direction. This allows the trailing band portion to be supplied to the drive roller unit at an appropriate supply angle. As a result, cross-sectional deformation such as crushing deformation of the trailing band portion can be suppressed, the trailing band portion and the pipe end can be stably fitted together, and pipe making defects such as derailment can be prevented.

[0008] Preferably, the roller shaft is inclined with respect to the arm width direction when viewed from the device height direction along the inward / outward direction of the helical tube. More preferably, when viewed from the device height direction, the roller shaft is inclined toward the extension front side with respect to the arm width direction to the opposite side from the installation location. This allows the roller shaft to be as perpendicular as possible to the feeding direction of the succeeding strip portion supplied from the rear side of the stretching.

[0009] Preferably, the roller shaft is inclined with respect to the arm width direction when viewed from the arm extension direction. This allows the roller axis to be oriented as parallel as possible to the twist direction of the succeeding strip portion along the strip width direction.

[0010] The present invention relates to a pipe making device that produces a spiral pipe made of a strip-shaped member while propelling the spiral pipe in a spiral winding direction, a drive roller unit arranged on the inner circumferential side of the tube end portion on the front side in the axial direction of the previously produced tube portion of the helical tube, for clamping a subsequent band portion of the unproduced tube of the band-shaped member following the tube end portion, and for pushing the subsequent band portion into an assembly location distant from the rear side of the spiral winding direction, thereby assembling the subsequent band portion into the tube end portion; a band guide arm extending from the drive roller unit toward the installation location; a connecting mechanism that connects the drive roller unit and the band guide arm so as to be angle adjustable around an axis that is along the device height direction and faces inward and outward directions of the spiral tube or around an axis that is along the band guide arm; The second feature is that it has the following. This pipe making device allows the angle of the roller shaft to be adjusted to match the actual feed angle of the trailing strip near the entrance to the drive roller unit. That is, the roller shaft can be adjusted so that, when viewed from the height direction of the device, it is perpendicular to the actual feed direction of the trailing strip, or so that, when viewed from the arm extension direction, it is parallel to the actual twist direction of the trailing strip. This reliably prevents the trailing strip from being crushed or deformed in cross section when clamped by the drive roller unit. As a result, the trailing strip and the pipe end can be reliably fitted together, reliably preventing pipe making defects such as derailment. [Effects of the Invention]

[0011] According to the present invention, when the subsequent band portion of the band-shaped member is supplied to the pipe making device, cross-sectional deformation of the subsequent band portion can be suppressed, and a spiral pipe can be made stably. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional side view of an existing pipe being rehabilitated by lining it with a rehabilitating pipe using a pipe manufacturing apparatus according to a first embodiment of the present invention. [Figure 2(a)] FIG. 2(a) is a cross-sectional view showing an example of a strip-shaped member that becomes the rehabilitating pipe. [Figure 2(b)] FIG. 2(b) is an enlarged cross-sectional view of the circle IIb in FIG. [Figure 2(c)] FIG. 2(c) is a cross-sectional view showing how the subsequent belt portion of the belt-shaped member is assembled into a rehabilitating pipe by the pipe producing device. [Figure 3] 3 is a front cross-sectional view taken along line III-III in FIG. [Figure 4]FIG. 4 is an enlarged cross-sectional view of the circle IV in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a plan view of a pipe producing apparatus according to a second embodiment of the present invention, seen from the height direction of the apparatus during pipe producing. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 5)> As shown in Fig. 1, an existing deteriorated pipe 1 is rehabilitated by lining the inner periphery of the pipe with a rehabilitation pipe 9. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried underground, but the present invention is not limited to this and may also be a water supply pipe, an agricultural water pipe, a gas pipe, a hydroelectric power generation water pipe, a tunnel, etc.

[0014] 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 2(a), the strip-shaped member 10 includes a strip body 11 made of a synthetic resin such as polyvinyl chloride and a reinforcing strip 16 made of a metal such as steel, and extends long in the strip length direction (perpendicular to the plane of the drawing). Fitting portions 13 and 14 with complementary concave and convex cross-sectional shapes are formed at both ends of the strip body 11 in the strip width direction (left and right in Figure 2(a)). A rib 15 with a T-shaped cross section is formed in the middle of the strip body 11 in the strip width direction so as to protrude toward the back side (outer periphery, the lower side in Figure 2(a)).

[0015] A reinforcing strip 16 having a generally M-shaped cross section is provided on the back side (outer peripheral side, lower side in FIG. 2(a)) of the strip body 11. An outer peripheral groove 18 is formed by the legs on both sides of the reinforcing strip 16. Preferably, the metal surface of the reinforcing strip 16 is covered with a resin layer 17 such as polyethylene (PE) or rigid polyvinyl chloride (PVC). The cross-sectional shape of the belt-shaped member 10 is not limited to that exemplified in Fig. 2(a). The coating resin layer 17 of the reinforcing belt material 16 may be omitted. The reinforcing belt material 16 may be omitted.

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

[0017] As shown in Figures 1 and 3, the rehabilitating pipe 9 is produced by a pipe producing device 20. The pipe producing device 20 is arranged at the pipe end 9e on the front side in the axial direction of the rehabilitating pipe 9 (the pipe portion produced in advance from the strip-shaped member 10). The pipe producing device 20 is a self-propelled pipe producing device that is propelled (self-propelled) in a clockwise spiral winding direction in Figure 3 along the inner circumference of the existing pipe 1 while producing the rehabilitating pipe 9 from the strip-shaped member 10.

[0018] The length of the pipe making device 20 along the spiral winding direction (forward and backward pushing direction LD) is approximately a few to several tens of times the circumference of the rehabilitation pipe 9. The pipe making device 20 has a non-inner circumference restricting structure that does not have an inner circumference restricting body such as a link roller that restricts the pipe end 9e from the inner circumference side, and the pipe end 9e other than the area where the pipe making device 20 is located is open to the inner circumference side.

[0019] In detail, as shown in FIG. 3, the pipe making device 20 comprises a drive roller unit 21 and a band guide arm 40. The drive roller unit 21 is arranged on the inner periphery of the pipe end 9e, away from the forward side of the forward / backward forward direction LD (clockwise in FIG. 3) of the assembly point 9p where the subsequent band portion 19 of the unmade pipe in the band-shaped member 10 is assembled into the pipe end 9e. The drive roller unit 21 includes a housing 22, one or more drive roller pairs 23, and a drive motor 24. For example, two drive roller pairs 23 are stored in the housing 22. Each drive roller pair 23 includes an outer roller 25 and an inner roller 26. The outer roller 25 and the inner roller 26 face each other in the height direction of the pipe making device 20 (the direction facing inward / outward of the rehabilitating pipe 9 or the pipe diameter direction; hereinafter referred to as the "device height direction HD"). The outer roller 25 is disposed at the bottom side in the device height direction HD within the housing 22 (lower left in FIG. 3) and contacts the outer peripheral side of the trailing belt portion 19. The inner roller 26 is disposed at the top side in the device height direction HD within the housing 22 (upper right in FIG. 3) and contacts the inner peripheral side of the trailing belt portion 19.

[0020] 4 and 5, the axes (roller shafts 29) of the outer roller 25 and the inner roller 26 are parallel to each other and directed in the width direction of the drive roller unit 21. A drive motor 24 is connected to at least one of the rollers 25, 26 via a torque transmission mechanism 28 including gears and the like so as to be able to transmit torque.

[0021] As shown in Figure 3, a tube end guide 31 is provided at the bottom of the drive roller unit 21 on the forward side of the forward movement. The tube end guide 31 is engaged with the tube end 9e so as to be able to slide in the spiral winding direction. The tube end guide 31 may be provided with a brake mechanism that generates a braking force by frictional resistance with the tube end 9e when the tube making device 20 is advanced. Furthermore, a conical step climbing roller 32 is provided on the side surface of the drive roller unit 21 facing the extension front side so as to protrude toward the extension front side (the front side of the paper in FIG. 3).

[0022] As shown in FIG. 3, a band guide arm 40 extends from the drive roller unit 21 toward the assembly location 9p behind the propulsion unit (right side in FIG. 3). The band guide arm 40 includes an outer arm 41 and an inner arm 42. The outer arm 41 is disposed relatively to the bottom side (lower side in FIG. 3) in the device height direction HD, and the inner arm 42 is disposed relatively to the top side (upper side in FIG. 3) in the device height direction HD. As shown in FIG. 4, when viewed from the device height direction, the longitudinal direction of the outer arm 41 and the inner arm 42, and therefore the longitudinal direction of the band guide arm 40 (hereinafter referred to as the "arm extension direction L40"), is aligned with the spiral winding direction. The width direction of the band guide arm 40 (hereinafter referred to as the "arm width direction W40"), which is perpendicular to the arm extension direction L40, is perpendicular to the spiral winding direction and the device height direction HD. An assembly guide path 43 for the trailing band portion 19 is defined between the outer arm 41 and the inner arm 42. The assembly guide path 43 gradually approaches the inner peripheral surface of the tube end 9e as it approaches the assembly point 9p along the arm extension direction L40 from the inner peripheral side of the tube end 9e. The trailing belt portion 19 from the drive roller unit 21 is passed through the assembly guide path 43. The outer arm 41 faces the outer peripheral side of the trailing belt portion 19. As shown by the two-dot chain line in Figure 2(c), the outer arm 41 may fit into the outer peripheral groove 18 of the trailing belt portion 19. The inner arm 42 faces the inner peripheral side surface of the trailing belt portion 19.

[0023] A tube end guide 34 is provided at the rear end of the band guide arm 40. The tube end guide 34 is engaged with the tube end 9e so as to be slidable in the spiral winding direction.

[0024] 4 and 5, the roller shaft 29 of the drive roller unit 21 is oriented obliquely with respect to the arm width direction W40. That is, when viewed from the device height direction HD, which is perpendicular to the plane of the paper in FIG. 4, the roller shaft 29 is inclined with respect to the arm width direction W40. More specifically, when viewed from the device height direction HD, the roller shaft 29 is inclined with respect to the arm width direction W40 toward the forward extension side (the opposite side from the installation location 9p) with respect to the arm width direction W40. Preferably, the smaller the pipe diameter of the rehabilitating pipe 9, the larger the angle θ of the roller shaft 29 with respect to the arm width direction W40 as viewed from the device height direction HD. The angle θ depends on the pipe diameter of the rehabilitating pipe 9, but is, for example, approximately 0°<θ≦15°.

[0025] Furthermore, the roller shaft 29 is inclined with respect to the arm width direction W40 when viewed from the arm extension direction L30, which is perpendicular to the plane of the paper in Fig. 5. For example, when viewed from the arm extension direction L30, the roller shaft 29 is inclined by an angle φ toward the bottom side in the device height direction HD, extending forward with respect to the arm width direction W40.

[0026] As shown in Figure 1, when an existing pipe 1 is rehabilitated using a pipe making device 20, a strip-shaped member 10 (following strip portion 19) is unwound from a winding drum 5 on the ground, passes through the starting manhole 4 and the inside of the rehabilitated pipe 9, and is introduced into the drive roller unit 21 of the pipe making device 20.

[0027] As shown in Figure 3, in the drive roller unit 21, the outer roller 25 and inner roller 26 clamp the trailing band portion 19 and push it rearward. As a result, the trailing band portion 19 passes through the assembly guide path 43 and is pushed into the pipe end 9e at the assembly point 9p on the pipe end 9e, thereby being assembled into the pipe end 9e. More specifically, as shown in Figure 2(c), the fitting portion 14 of the trailing band portion 19 is fitted into the fitting portion 13 of the pipe end 9e in a concave-convex manner. This progresses the production of the rehabilitated pipe 9.

[0028] As shown in Figure 4, the trailing strip 19 is fed to the pipe making device 20 from the rear side of the stretching (the right side in Figure 4) through the inside of the rehabilitating pipe 9, so that the feeding angle direction of the trailing strip 19 near the entrance to the drive roller unit 21 is angled with respect to the arm extension direction L40 and the arm width direction W40. The feeding angle direction of the trailing strip 19 is a feeding angle direction α L19 and a twist angle direction α representing the twist direction along the belt width direction of the trailing belt portion 19. W19 Includes.

[0029] The roller shaft 29 of the drive roller unit 21 is inclined relative to the band guide arm 40 so as to be aligned with the feed angle of the trailing band 19. Preferably, the roller shaft 29 is aligned with the feed angle direction α of the trailing band 19 near the entrance to the drive roller unit 21 as viewed from the device height direction HD. L19 Alternatively, when viewed from the arm extension direction L40, the roller shaft 29 is perpendicular to the twist angle direction α of the trailing belt portion 19 near the entrance to the drive roller unit 21. W19 This prevents cross-sectional deformation such as crushing of the trailing band portion 19. Therefore, the fitting portion 14 of the trailing band portion 19 can be stably fitted with the fitting portion 13 of the pipe end portion 9e, preventing pipe manufacturing defects such as derailment.

[0030] Next, another embodiment of the present invention will be described. In the following embodiments, the same components as those already described will be denoted by the same reference numerals in the drawings and the description thereof will be omitted. <Second embodiment (Fig. 6)> As shown in Figure 6, in a pipe making apparatus 20B according to a second embodiment of the present invention, a connecting mechanism 51 with a two-axis angle adjustment mechanism is interposed between the drive roller unit 21 and the band guide arm 40. The drive roller unit 21 and the band guide arm 40 are connected via the connecting mechanism 51 so that the angle can be adjusted around two axes C1 and C2. One axis C1 runs along the height direction of the apparatus, perpendicular to the plane of the paper in Figure 6. The other axis C2 runs along the arm extension direction L40.

[0031] According to the pipe making apparatus 20B, the angle of the roller shaft 29 can be adjusted around two axes C1 and C2 in accordance with the actual feed angle of the trailing belt portion 19. That is, when viewed from the height direction of the apparatus (the direction perpendicular to the paper surface of FIG. 6), the roller shaft 29 is oriented in the actual feed angle direction α of the trailing belt portion 19. L19 The angle of the driving roller unit 21 is adjusted around the axis C1 so that the roller shaft 29 is perpendicular to the actual twist angle direction α of the trailing belt portion 19 when viewed from the arm extension direction L40. W19 The angle of the drive roller unit 21 is adjusted around the axis C2 so that the trailing belt portion 19 is parallel to the outer roller 25 and the inner roller 26. This allows the trailing belt portion 19 to be supplied between the outer roller 25 and the inner roller 26 at an angle perpendicular to these rollers 25, 26. This reliably prevents the trailing belt portion 19 from being crushed or deformed in cross section when it is clamped between the rollers 25, 26. As a result, the fitting portions 13, 14 of the pipe end 9e and the trailing belt portion 19 can be reliably and stably fitted together, reliably preventing pipe manufacturing defects such as derailment.

[0032] 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, in the first embodiment (FIGS. 1 to 5), the roller shaft 29 may be inclined with respect to the arm width direction W40 when viewed from the device height direction HD, but may be aligned with the arm width direction W40 when viewed from the arm extension direction L40. Alternatively, the roller shaft 29 may be inclined with respect to the arm width direction W40 when viewed from the arm extension direction L40, but may be aligned with the arm width direction W40 when viewed from the device height direction HD. The roller shaft 29 may be inclined toward the top side in the device height direction HD toward the extension front side with respect to the arm width direction W40 when viewed from the arm extension direction L40. The connecting mechanism 51 of the second embodiment (FIG. 6) may be capable of adjusting the angle of the drive roller unit 21 around only one of the two axes C1 and C2. The pipe making device may have an inner circumference regulating body such as a link roller. [Industrial Applicability]

[0033] The present invention can be applied to, for example, a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0034] 1 Existing pipes 9 Rehabilitated pipe (pipe section manufactured in advance) 9e Tube end 9p Installation location 10. Belt-shaped member 11 Obi body 19 Trailing belt 20 Pipe making equipment 20B Pipe making equipment 21 Drive roller unit 23 Drive roller pair 24 Drive motor 25 outer roller 26 Inner roller 28 Torque transmission mechanism 29 Roller shaft 31,34 Pipe end guide 40 Belt guide arm L40 Arm extension direction W40 Arm width direction 43 Built-in guideway 51 Linkage mechanism with two-axis angle adjustment mechanism

Claims

1. In a pipe making device in which a spiral pipe made of a strip-shaped member is made and propelled in a spiral winding direction, a drive roller unit arranged on the inner circumferential side of the tube end portion on the front side in the axial direction of the previously produced tube portion of the helical tube, for clamping a subsequent band portion of the unproduced tube of the band-shaped member following the tube end portion, and for pushing the subsequent band portion into an assembly location distant from the rear side of the spiral winding direction, thereby assembling the subsequent band portion into the tube end portion; a band guide arm extending from the drive roller unit toward the installation location; A pipe making apparatus comprising: a drive roller unit having a roller axis oriented obliquely with respect to an arm width direction perpendicular to an arm extension direction along the band guide arm.

2. 2. A pipe making apparatus as described in claim 1, wherein the roller shaft is inclined with respect to the arm width direction when viewed from the device height direction along the inward and outward direction of the spiral pipe.

3. A pipe making apparatus as described in claim 2, wherein, when viewed from the height direction of the apparatus, the roller shaft is inclined toward the front extension side relative to the arm width direction, opposite to the installation location.

4. A pipe making apparatus according to any one of claims 1 to 3, wherein the roller shaft is inclined with respect to the arm width direction when viewed from the arm extension direction.

5. In a pipe making device in which a spiral pipe made of a strip-shaped member is made and propelled in a spiral winding direction, a drive roller unit arranged on the inner circumferential side of the tube end portion on the front side in the axial direction of the previously produced tube portion of the helical tube, for clamping a subsequent band portion of the unproduced tube of the band-shaped member following the tube end portion, and for pushing the subsequent band portion into an assembly location distant from the rear side of the spiral winding direction, thereby assembling the subsequent band portion into the tube end portion; a band guide arm extending from the drive roller unit toward the installation location; a connecting mechanism that connects the drive roller unit and the band guide arm so as to be angle adjustable around an axis that is along the device height direction and faces inward and outward directions of the spiral tube or around an axis that is along the band guide arm; A pipe making apparatus comprising:

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