Pipe manufacturing equipment for rehabilitation of existing pipes

Abstract

The present invention provides a pipe-making apparatus that can reliably prevent the resin coating layer covering the reinforcing strip material of a strip-shaped member from being scraped off by the drive roller when manufacturing a spiral-shaped rehabilitated pipe from a strip-shaped member. [Solution] A pipe-making device 30 for rehabilitating existing pipes is used to manufacture a spiral-shaped rehabilitated pipe 9 from a long strip-shaped member 10 and line the inner circumference of the existing pipe 1. The drive unit 40 of the pipe-making device 30 drives the unmanufactured trailing strip portion 19 of the strip-shaped member 10 into a trailing strip track L. 19 The drive unit 40 is fed along the trailing belt track L to the end 9e of the rebuilt pipe 9 being manufactured and incorporated into the rebuilt pipe 9. 19 It has multiple drive units 41, 42 arranged along the trailing belt track L. Each of the drive units 41, 42 is connected to the trailing belt track L. 19 It includes two pairs of drive rollers 45.46 arranged along the axis, one drive motor 44, and a torque transmission mechanism 49 that connects the roller shafts of each pair of drive rollers to the output shaft 442 of the drive motor 44 in a torque-transmitting manner.

Description

Technical Field

[0001] The present invention relates to a pipe making apparatus for rehabilitating existing pipes such as aged sewer pipes, and particularly to a pipe making apparatus that forms a helical tubular rehabilitation pipe from a long strip member (profile) and lines the inner circumference of the existing pipe. Background Art

[0002] A construction method for rehabilitating an existing pipe by using a pipe making apparatus to helically wind a long strip member (profile) along the inner circumference of the existing pipe and form a helical tubular rehabilitation pipe is known (see, for example, Patent Documents 1 and 2). The pipe making apparatus of Patent Document 1 has a single drive unit including two pairs of drive rollers and one drive motor. The drive motor and each pair of drive rollers are connected via gears or the like so that torque can be transmitted. An unformed subsequent strip portion of the strip member is passed between the pair of drive rollers of each drive roller pair. The subsequent strip portion is connected to the pipe end on the forward extension side of the rehabilitation pipe during pipe making. Driven by the drive motor, each drive roller is rotationally driven, and the subsequent strip portion is fed into the pipe end and incorporated into the rehabilitation pipe, whereby pipe making progresses. The pipe making apparatus of Patent Document 2 has a single drive unit including a single pair of drive rollers and one drive motor.

[0003] The strip member includes, for example, a strip body made of synthetic resin such as polyvinyl chloride and a reinforcing strip made of steel (see Patent Document 2, etc.). The reinforcing strip is attached to the outer peripheral side portion of the strip body (the side portion facing the outer peripheral side of the rehabilitation pipe). In the strip member of Patent Document 2, the entire surface of the reinforcing strip is covered with a resin coating layer such as polyethylene to improve durability. Prior Art Documents Patent Documents

[0004] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2019-018474 Patent Document 2 Japanese Patent Publication No. 2021-053842 [Overview of the project] [Problems that the invention aims to solve]

[0005] In the aforementioned Patent Document 2, the durability of the rehabilitation pipe can be increased by covering the steel reinforcing strip of the strip-shaped member with a resin coating layer. On the other hand, when the strip-shaped member is clamped between a pair of drive rollers in the drive unit and fed to the end of the rehabilitation pipe, there is a risk that the resin coating layer may be worn away by contact with the drive rollers. In view of these circumstances, the present invention aims to provide a pipe-making apparatus that can reliably prevent the resin coating layer covering the reinforcing strip material of a strip-shaped member from being scraped off by the drive roller when manufacturing a spiral tubular rehabilitated pipe from a strip-shaped member. [Means for solving the problem]

[0006] To solve the aforementioned problems, the present invention provides a pipe manufacturing apparatus for rehabilitating existing pipes, which manufactures a spiral-shaped rehabilitation pipe from a long strip-shaped member and lines the inner circumference of the existing pipe with it. The aforementioned strip-shaped member is equipped with a drive unit that feeds the trailing strip portion of the unmanufactured pipe along the trailing strip track to the pipe end of the rehabilitated pipe being manufactured and incorporates it into the rehabilitated pipe. The drive unit has a plurality of drive units arranged along the trailing track, Each of the drive units is characterized by including two pairs of drive rollers arranged along the trailing belt track, each having a pair of drive rollers that clamp the trailing belt; one drive motor; and a torque transmission mechanism that connects the roller shafts of each pair of drive rollers to the output shaft of the drive motor in a torque-transmitting manner.

[0007] In this pipe-making apparatus, the total contact area A between the drive rollers of the entire drive unit and the trailing strip is increased compared to pipe-making apparatuses with a single drive unit structure, such as those described in the aforementioned Patent Documents 1 and 2. The drive output P for feeding the trailing strip to the end of the pipe can be made to the same level as that of a pipe-making apparatus with a single drive unit structure by sharing the load among the drive motors of multiple drive units. Therefore, the drive stress D (=P / A) can be reduced. As a result, the drive stress D can be made to be less than or equal to the abrasion resistance S per unit area of ​​the resin coating layer of the strip member (D≦S). As a result, abrasion of the resin coating layer can be reliably prevented.

[0008] Preferably, the drive torque input from the drive motor in each drive unit to the two pairs of drive rollers is equal to each other, and the drive torque of the multiple drive units is equal to each other. This allows the feeding force applied to the trailing belt from multiple drive roller pairs of drive units to be made equal to each other. This prevents variations in feeding force caused by different drive roller pairs.

[0009] Preferably, the torque transmission mechanism in each drive unit includes a motor-side gear provided on the output shaft and roller-side gears provided on the roller shafts of the two pairs of drive rollers, respectively, and meshed with the motor-side gear. The number of teeth on the roller-side gears provided on the two drive rollers of each drive unit, which are arranged on the same side in the inward and outward directions intersecting the trailing track, are equal to each other. The number of teeth on the roller-side gears on the same side of multiple drive units are equal to each other. This allows the drive motor in each drive unit to apply the same magnitude of drive torque to the drive rollers located on the same side of two pairs of drive rollers, and also allows the drive rollers located on the same side in multiple drive units to apply the same magnitude of drive torque to each other. The distance between the drive motor and each pair of drive rollers can be made equal. Therefore, there will be no difference in drive torque between drive roller pairs that are close to the drive motor and those that are farther away from the drive motor.

[0010] Preferably, two adjacent drive units along the trailing track are connected via a rotary coupling mechanism so as to be angle-adjustable around a rotary coupling shaft parallel to the roller shaft. This allows multiple drive units to be positioned at an angle to each other, in accordance with the curvature of the trailing belt. This enables the trailing belt to be smoothly guided along the trailing belt track. By suppressing excessive force acting on the trailing belt, the wear of the resin coating layer can be prevented even more reliably.

[0011] The rotational coupling mechanism includes an angle adjustment member spanning across the two drive units so as to connect the connected portions of the two drive units that are far from the rotational coupling shaft, allowing them to move closer together and further apart. The angle of the two drive units can be adjusted by manipulating the angle adjustment member to move the connected parts closer together and further apart. [Effects of the Invention]

[0012] According to the present invention, when manufacturing a spiral tubular rehabilitated pipe from a strip-shaped member, it is possible to reliably prevent the resin coating layer covering the reinforcing strip of the strip-shaped member from being worn away by contact with the drive roller. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a cross-sectional view showing the rehabilitation process of an existing pipe using a pipe manufacturing apparatus according to one embodiment of the present invention, in a cross-section along the pipe axis. [Figure 2] Figure 2 is a front cross-sectional view taken along the line II-II in Figure 1. [Figure 3] Figure 3 is a front view of the pipe-making apparatus along line III-III in Figure 4, showing the drive unit before the angle adjustment of the adjacent drive units. [Figure 4] Figure 4 is a side cross-sectional view of the drive unit along the line IV-IV in Figure 3. [Figure 5] Figure 5 is a cross-sectional view showing an enlarged view of the area between the pair of drive rollers shown in Figure 4. [Figure 6] Figure 6 is a cross-sectional view along the line VI-VI in Figure 2. [Figure 7] Figure 7 is a front view showing the state in which the adjacent drive units of the drive unit have been angle-adjusted.

[0014] One embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows the process of rehabilitating an existing pipe 1 consisting of an aging sewer pipe. Note that the existing pipes to be rehabilitated are not limited to sewer pipes, but may also include water supply pipes, agricultural water pipes, hydroelectric power generation water conduits, gas pipes, tunnels, etc.

[0015] As shown in Figures 1 and 2, the existing pipe 1 is rehabilitated by lining its inner circumference with a rehabilitated pipe 9. The rehabilitated pipe 9 is a spiral pipe consisting of a long, strip-shaped member 10. As shown in Figure 5, the strip-shaped member 10 includes a strip body 11 and a reinforcing strip material 20, is formed in a certain irregular cross-section, and extends in the strip-length direction perpendicular to the plane of the paper in Figure 5.

[0016] The material of the band body 11 is a synthetic resin such as polyvinyl chloride, polyethylene, or polypropylene. The band body 11 includes a flat band portion 12, fitting portions 13 and 14, and ribs 15. The fitting portions 13 and 14, which have complementary concave and convex cross-sectional shapes, are provided at both edges of the flat band portion 12 in the band width direction (left and right in Figure 5). Two (or more) T-shaped ribs 15 are provided in the middle of the flat band portion 12 in the band width direction, so as to protrude outward (towards the outer circumference of the rehabilitation pipe 9, downward in Figure 5).

[0017] A reinforcing strip 20 is provided on the outer peripheral side (lower side in Figure 5) of the main body of the strip 11. The strip-shaped member 10 is reinforced by the reinforcing strip 20. The reinforcing strip 20 has a body portion 21 in the center in the width direction of the strip and a pair of arm portions 22 on both sides of the body portion 21, and is formed in a constant cross section that is roughly Ω-shaped or W-shaped, and extends in an elongated shape in a direction perpendicular to the plane of the paper in Figure 5. The body portion 21 is fitted so as to overlap the two ribs 15. The arm portions 22 are connected to both sides of the body portion 2 via connecting portions 23. The arm portions 22 on both sides are locked to corresponding fitting portions 13 and 14, respectively. An outer peripheral groove portion 24 is defined between the body portion 21 and each arm portion 22, opening outwards (downwards in Figure 5). The groove bottom portion 24b of the outer peripheral groove portion 24 is formed by the connecting portion 23.

[0018] As shown in Figure 5, the reinforcing strip material 20 includes a reinforcing strip body 25 and a resin coating layer 26. The reinforcing strip body 25 is made of a metal such as steel or iron. The entire surface of the reinforcing strip body 25 is covered with a resin coating layer 26. The material of the resin coating layer 26 is a resin such as polyethylene (PE).

[0019] As shown in Figure 6, in the rehabilitated pipe 9, the strip-shaped member 10 is wound spirally along the inner circumference of the existing pipe 1, and the fitting portions 13 and 14 adjacent to each other at two edges of the strip-shaped member 10 are interlocked.

[0020] As shown in Figures 1 and 2, the strip-shaped member 10 is formed into a spiral-shaped rehabilitated pipe 9 by a pipe-making device 30 for rehabilitating existing pipes. In this embodiment, the pipe-making device 30 is a so-called self-propelled pipe-making device. The self-propelled pipe-making device 30 is positioned at the pipe end 9e on the extending front side (right side in Figure 1) of the rehabilitated pipe 9 during pipe-making, and is propelled along the inner circumference of the existing pipe 1 in a spiral winding direction (clockwise and towards the viewer in Figure 2) while forming the rehabilitated pipe 9 from the strip-shaped member 10.

[0021] As shown in Figure 2, the pipe-making apparatus 30 comprises an apparatus frame 31 and a drive unit 40. The apparatus frame 31 is positioned on the inner circumference of the pipe end 9e. As shown in Figures 1 and 2, the longitudinal direction of the apparatus frame 31 and thus the pipe-making apparatus 30 (hereinafter referred to as "apparatus longitudinal direction LD") is oriented in the direction of helical winding. The width direction of the pipe-making apparatus 30 (hereinafter referred to as "apparatus width direction WD") is oriented to substantially align with the pipe axis direction (perpendicular to the plane of the paper in Figure 2) at the pipe end 9e of the rehabilitated pipe 9. More precisely, the apparatus width direction WD is angled with respect to the pipe axis direction by the helical lead angle of the rehabilitated pipe 9. The height direction of the pipe-making apparatus 30 (hereinafter referred to as "apparatus height direction HD") is oriented to align with the pipe diameter direction (inside-outside direction) of the pipe end 9e. A pipe end guide 32 is provided at the bottom of the apparatus height direction HD in the apparatus frame 31. As shown in Figure 6, the pipe end guide 32 is engaged with the pipe end 9e so as to be slidable in the circumferential direction of the pipe (more precisely, in the spiral winding direction).

[0022] As shown in Figure 2, the drive unit 40 is mounted on the device frame 31. The drive unit 40 drives the trailing belt orbit L 19 The following belt orbit L is defined. 19 It extends diagonally from the inner circumference side of the pipe end 9e during pipe making to the pipe end 9e behind the pipe making device 30. The drive unit 40 moves the unmade trailing strip portion 19 of the strip member 10 along the trailing strip track L 19 It is fed along the line to the pipe end 9e of the rehabilitated pipe 9 being manufactured and incorporated into the rehabilitated pipe 9.

[0023] In detail, as shown in Figure 3, the drive unit 40 is located on the trailing belt track L 19 It has multiple (two in this case) drive units 41, 42 arranged along the trailing belt orbit L. 19 The drive unit 41 is located on the preceding track side (left side in Figure 3). The trailing belt track L 19 The drive unit 42 is located on the trailing side of the track (right side in Figure 3).

[0024] The structures of the two drive units 41 and 42 are substantially identical. As shown in Figures 3 and 4, each of the drive units 41 and 42 includes a unit housing 43, one drive motor 44, two sets of drive roller pairs 45 and 46, and a torque transmission mechanism 49. The drive motor 44 of the respective drive unit 41, 42 is installed on an outer surface of each unit housing 43. The outputs (drive torques) of the drive motors 44 of the two drive units 41 and 42 are equal to each other. The axis of a motor shaft 442 (output shaft) of the drive motor 44 is oriented in the device width direction WD. Two sets of drive roller pairs 45, 46 and the torque transmission mechanism 49 are housed inside each unit housing 43.

[0025] As shown in Figure 3, the two sets of drive roller pairs 45 and 46 in each drive unit 41 and 42 are arranged along the trailing belt track L 19 . In each drive unit 41, 42, the drive roller pair 45 is disposed on the upstream side of the track (the left side in Figure 3), and the drive roller pair 46 is disposed on the downstream side of the track (the right side in Figure 3). Accordingly, in the drive section 40, four drive roller pairs 45, 46, 45, 46 are arranged along the trailing belt track L 19 . Hereinafter, when distinguishing these four drive roller pairs 45, 46, 45, 46, their constituent elements, and related elements such as gears described later from each other, reference symbols A, B, C, D are added in order from the upstream side along the trailing belt track L 19 . That is, the drive roller pairs 45A, 46B, 45C, and 46D are arranged in this order from the upstream side of the track along the trailing belt track L 19 .

[0026] Each drive roller pair 45, 46 of each drive unit 41, 42 includes a pair of drive rollers 47, 48. These drive rollers 47, 48 face each other in the inner-outer direction intersecting the trailing belt track L 19 across the trailing belt track L 19 (the vertical direction in Figure 3). In other words, the trailing belt track L 19 is defined by the drive rollers 47 and 48. A trailing belt portion 19 on the trailing belt track L 19 is sandwiched between the pair of drive rollers 47 and 48.

[0027] In the drive unit 40, the trailing belt track L 19 Four inner drive rollers 47A, 47B, 47C, and 47D are arranged sequentially from the track front side on the inner side (upper side in Figure 3) in the inward-outward direction, and four outer drive rollers 48A, 48B, 48C, and 48D are arranged sequentially from the track front side on the outer side (lower side in Figure 3) in the inward-outward direction.

[0028] As shown in Figure 4, the inner drive roller 47 is formed in a cylindrical shape with its axial length oriented in the device width direction WD. The inner drive roller 47 is in contact with the inner circumferential surface (upper surface in Figure 4) of the flat band portion 12 of the trailing band portion 19. The shaft 472 (roller axis) of the inner drive roller 47 is oriented in the device width direction WD.

[0029] As shown in Figure 4, the outer drive roller 48 includes two (or more) disc-shaped roller portions 481 and a roller shaft 482 (roller axis). The axis of the roller shaft 482 is oriented in the device width direction WD. Two roller portions 481 are provided on the roller shaft 482, spaced apart from each other in the device width direction WD. The outer diameter of the roller portions 481 is larger than the outer diameter of the inner drive roller 47. As shown in Figure 5, preferably, a knurled or other uneven pattern 483 is formed on the outer circumferential surface of each roller portion 481. Each roller portion 481 is inserted into the outer circumferential groove portion 24 of the trailing band portion 19 and is in contact with the groove bottom portion 24b.

[0030] As shown in Figures 3 and 4, in each drive unit 41, 42, the roller shafts 472, 482 of two sets of drive roller pairs 45, 46 and the motor shaft 442 of the drive motor 44 are connected by a torque transmission mechanism 49 to transmit torque.

[0031] The drive torque T input from the drive motor 44 in each drive unit 41, 42 to the two pairs of drive rollers 45, 46 via the torque transmission mechanism 49 is equal to each other. That is, the drive torque T from the drive motor 44 of drive unit 41 to the drive roller pair 45A is equal to each other.A And the drive torque T from the same drive motor 44 to the drive roller pair 46B. B This means that they are equal to each other (T A =T B ). Furthermore, the drive torque T from the drive motor 44 of the drive unit 42 to the drive roller pair 45C C And the drive torque T from the same drive motor 44 to the drive roller pair 46D D This means that they are equal to each other (T C =T D ). Furthermore, the drive torque T of the two (or more) drive units 41, 42 A ,T B ,T C ,T D are equal to each other (T A =T B =T C =T D ).

[0032] As shown in Figures 3 and 4, the torque transmission mechanism 49 includes a motor-side gear 50 and two pairs of roller gears 51 and 52. The motor-side gear 50 is directly connected to the motor shaft 442. The motor-side gears 50 of the two drive units 41 and 42 are of the same diameter and have the same number of teeth.

[0033] As shown in Figure 3, in each drive unit 41, 42, the roller gear pair 51 is a trailing belt track L 19 The motor-side gear 50 is positioned further forward on the track (to the left in Figure 3) than the position of the motor-side gear 50. In each drive unit 41, 42, the roller gear pair 52 is positioned on the trailing track L 19 The motor-side gear 50 is positioned further down the track (to the right in Figure 3) than the motor-side gear 50. Therefore, in the drive unit 40, the four roller gear pairs 51A, 52B, 51C, and 52D are positioned on the trailing track L 19 They are arranged sequentially from the front of the track along the path.

[0034] As shown in Figure 3, each pair of roller gears 51, 52 includes a pair of roller-side gears 53, 54 facing each other on the inner side (upper side in Figure 3) and outer side (lower side in Figure 3). These pairs of roller-side gears 53, 54 mesh directly with each other. The inner roller-side gear 53 meshes directly with the corresponding motor-side gear 50. The outer roller-side gear 54 meshes with the motor-side gear 50 via the inner roller-side gear 53. Preferably, the inner roller-side gear 53 has a larger diameter and more teeth than the motor-side gear 50. The outer roller-side gear 54 has a larger diameter and more teeth than the inner roller-side gear 53.

[0035] The number of teeth N of the roller-side gears provided on the two drive rollers 45 and 46 of each drive unit 41 and 42, which are arranged on the same side in the inward / outward direction (up / down direction in Figure 3), are equal. That is, the number of teeth N of the roller-side gears 53A and 53B on the same inner side in drive unit 41 are equal. 53A ,N 53B are equal to each other (N 53A =N 53B ). Furthermore, the number of teeth N of the roller gears 54A and 54B on the outer side are the same. 54A ,N 54B are equal to each other (N 54A =N 54B ). Also, the number of teeth N of the inner roller gears 53C and 53D in the drive unit 42 53C ,N 53D are equal to each other (N 53C =N 53D ). And the number of teeth N of the roller gears 54C and 54D on the outer side are the same. 54C ,N 54D are equal to each other (N 54C =N 54D ).

[0036] In the drive unit 40, the four inner roller side gears 53A, 53B, 53C, and 53D are connected to the trailing track L 19They are arranged sequentially from the front of the track along this line. The four inner roller gears 53A, 53B, 53C, and 53D are of equal size and have the same number of teeth N 53A ,N 53B ,N 53C ,N 53D are equal to each other (N 53A =N 53B =N 53C =N 53D ). Furthermore, the four outer roller side gears 54A, 54B, 54C, and 54D are located on the trailing belt track L 19 They are arranged sequentially from the front of the track along the curve. The four outer roller gears 54A, 54B, 54C, and 54D are of equal size and have the same number of teeth N 54A ,N 54B ,N 54C ,N 54D are equal to each other (N 54A =N 54B =N 54C =N 54D ).

[0037] As shown in Figure 3, in the drive unit 41, the two roller-side gears 53A and 53B mesh with portions of the motor-side gear 50 that are separated from each other by an angle α1. A virtual center line L passes through the midpoint of these meshing portions and the center point of the motor-side gear 50. 41 In this regard, the two pairs of roller gears 51A and 52B in the drive unit 41 are symmetrical.

[0038] In the drive unit 42, the two roller-side gears 53C and 53D mesh with portions of the motor-side gear 50 that are separated from each other by an angle α2. A virtual center line L passes through the midpoint of these meshing portions and the center point of the motor-side gear 50. 42 In this regard, the two pairs of roller gears 51C and 52D in the drive unit 42 are symmetrical. The angles α1 and α2 of the two drive units 41 and 42 are equal (α1 = α2).

[0039] In each drive unit 41, 42, the roller shafts 472, 482 of the two pairs of drive rollers 45, 46 are directly connected to the corresponding roller-side gears 53, 54, respectively. That is, the roller-side gear 53A is directly connected to the drive roller 47A. The roller-side gear 54A is directly connected to the drive roller 48A. The roller-side gear 53B is directly connected to the drive roller 47B. The roller-side gear 54B is directly connected to the drive roller 48B. The roller-side gear 53C is directly connected to the drive roller 47C. The roller-side gear 54C is directly connected to the drive roller 48C. The roller-side gear 53D is directly connected to the drive roller 47D. The roller-side gear 54D is directly connected to the drive roller 48D.

[0040] As shown in Figure 3, the drive unit 40 is further provided with a rotary coupling mechanism 60. Two adjacent drive units 41 and 42 are connected to each other via the rotary coupling mechanism 60. The rotary coupling mechanism 60 includes a rotary coupling shaft 61 and an angle adjustment member 62. The rotary coupling shaft 61 is positioned in the middle of the drive units 41 and 42 in the device height direction HD. For example, the rotary coupling shaft 61 is connected to the following track L 19 It is positioned higher up in the device height direction HD, i.e., on the inner side (upper side in Figure 3). The axis of the rotary connecting shaft 61 is parallel to the roller shafts 472 and 482 (roller axes) and directed in the device width direction WD. The drive units 41 and 42 are connected so as to be able to rotate relative to each other around the rotary connecting shaft 61.

[0041] As shown in Figure 3, the angle adjustment member 62 is positioned away from the rotating connecting shaft 61 on the upper side (upper side in Figure 3) in the device height direction HD. Preferably, the angle adjustment member 62 is positioned at the top end (upper end in Figure 3) of the drive unit 40 in the device height direction HD. The angle adjustment member 62 has a shaft portion 63 and an operating handle 64. The shaft portion 63 is perpendicular to the device width direction WD and extends roughly along the trailing track L15 or the device longitudinal direction LD. A male screw 63a is formed on the outer circumference of the shaft portion 63. The operating handle 64 is provided at the end of the shaft portion 63 on the trailing side.

[0042] A connected portion 71 is formed at the top of the unit housing 43 of the drive unit 41 so as to protrude upward. A connected portion 72 is formed at the top of the unit housing 43 of the drive unit 42 so as to protrude upward. The shaft portion 63 of the angle adjustment member 62 is spanned between these connected portions 71 and 72. The connected portions 71 and 72 are connected to each other via the angle adjustment member 62.

[0043] As shown in Figures 3 and 4, the connected portion 71 is provided with a screw receiving portion 73. The screw receiving portion 73 is rotatable around an axis along the device width direction WD, which is perpendicular to the plane of the paper in Figure 3. The male thread 63a of the shaft portion 63 is screwed into the female thread of the screw receiving portion 73. The connected portion 72 is provided with a rotation support portion 74. The rotation support portion 74 is rotatable around an axis along the device width direction WD, which is perpendicular to the plane of the paper in Figure 3. The end of the shaft portion 63 on the track downstream side is rotatably supported by the rotation support portion 74.

[0044] As shown in Figures 3 and 7, the angle adjustment member 62 is rotated by the operating handle 64, causing the connected parts 71 and 72 to move closer together and further apart. This allows the angle of the two drive units 41 and 42 to be adjusted around the rotating connecting shaft 61.

[0045] Using the pipe-making device 30, the deteriorated existing pipe 1 is rehabilitated in the following manner. The unfinished trailing strip portion 19 of the strip-shaped member 10 is unfurled from the drum 6 on the ground, passes through the manhole 4 and the finished portion of the rehabilitated pipe 9, and is introduced into the drive unit 40 of the pipe-making device 30 on the inner circumference of the pipe end 9e. In the drive unit 40, the trailing strip portion 19 follows the trailing strip track L 19 It is passed sequentially between the drive rollers 47 and 48 of the drive roller pairs 45A, 46B, 45C, and 46D.

[0046] Preferably, the relative angle between the two drive units 41 and 42 is adjusted in advance by rotating the angle adjustment member 62 with the operating handle 64 of the rotary coupling mechanism 60, thereby adjusting the following track L 19The following strip section 19 is adjusted to match its curvature. This makes it easier to pass the following strip section 19 between the drive rollers 47 and 48 of the four drive roller pairs 45A, 46B, 45C, and 46D.

[0047] During pipe manufacturing, the drive motors 44 of the two (or more) drive units 41 and 42 of the drive unit 40 are driven synchronously with each other and with the same output. The drive torque of these drive motors 44 is transmitted to the drive roller pairs 45A, 46B, 45C, and 46D via the corresponding torque transmission mechanisms 49, and the drive rollers 47 and 48 of these drive roller pairs 45A, 46B, 45C, and 46D are rotated.

[0048] More specifically, in the drive unit 41 on the track front side, the drive torque of the drive motor 44 is directly transmitted from the motor-side gear 50 to the two inner roller-side gears 53A and 53B, causing the inner drive rollers 47A and 47B to rotate. Furthermore, the drive torque is transmitted from the inner roller-side gear 53A to the outer roller-side gear 54A, causing the outer drive roller 48A to rotate, and also transmitted from the inner roller-side gear 53B to the outer roller-side gear 54B, causing the outer drive roller 48B to rotate.

[0049] In the drive unit 42 on the trailing side of the track, the drive torque of the drive motor 44 is directly transmitted from the motor-side gear 50 to the two inner roller-side gears 53C and 53D, causing the inner drive rollers 47C and 47D to rotate. Furthermore, the drive torque is transmitted from the inner roller-side gear 53C to the outer roller-side gear 54C, causing the outer drive roller 48C to rotate, and also transmitted from the inner roller-side gear 53D to the outer roller-side gear 54D, causing the outer drive roller 48D to rotate.

[0050] As a result, the trailing belt section 19 becomes the trailing belt track L 19The material is propelled backward by four pairs of drive rollers 45A, 46B, 45C, and 46D along the material and pushed into the pipe end 9e. Then, the second fitting portion 14 of the trailing belt 19 and the first fitting portion 13 of the pipe end 9e are fitted together. As a result, the trailing belt 19 is incorporated into the rehabilitated pipe 9, and the pipe manufacturing process progresses. At the same time, the pipe manufacturing device 30 is propelled in the spiral winding direction by the reaction force of the pushing of the trailing belt 19. In this way, the existing pipe 1 can be rehabilitated by lining the inner circumference of the existing pipe 1 with a spiral-shaped rehabilitated pipe 3.

[0051] In the pipe-making apparatus 30, the total contact area A between the drive rollers 47, 48 of the drive unit 40 and the subsequent strip portion 19 is greater than that of a pipe-making apparatus consisting of a single drive unit and two pairs of drive rollers, such as the one described in Patent Document 1, or a pipe-making apparatus consisting of a single drive unit and a single pair of drive rollers, such as the one described in Patent Document 2. On the other hand, the drive output P for feeding the subsequent strip portion 19 to the pipe end 9e can be made to the same level as that of a pipe-making apparatus with a single drive unit structure by sharing the drive motor 44 of two (or more) drive units 41, 42. Therefore, the drive stress D (= P / A) can be reduced. As a result, the drive stress D can be made to be less than or equal to the abrasion resistance S per unit area of ​​the resin coating layer 26 of the strip member 10 (D ≤ S). As a result, it is possible to prevent the resin coating layer 26 from being abraded by the drive of the drive rollers 47, 48.

[0052] Because the drive torque input to the drive rollers 45A, 46B, 45C, and 46D is equal to each other (T A =T B =T C =T D ), the feeding force applied to the subsequent belt section 19 from these drive roller pairs 45A, 46B, 45C, and 46D can be made equal to each other. In other words, variations in the feeding force due to the drive roller pairs 45A, 46B, 45C, and 46D can be prevented. There will be no difference in driving torque between drive roller pairs close to the drive motor and drive roller pairs far from the drive motor. Therefore, the subsequent belt section 19 can be stably fed to the pipe end 9e, and the wear of the resin coating layer 26 can be reliably prevented. Furthermore, the rotational coupling mechanism 60 ensures that the relative angle between the two drive units 41 and 42 matches the curvature of the trailing belt portion 19, allowing the trailing belt portion 19 to be guided smoothly. This suppresses excessive force from acting on the trailing belt portion 19, further reliably preventing the resin coating layer 26 from being worn away.

[0053] The present invention is not limited to the embodiments described above, and various modifications can be made without departing from its spirit. For example, the drive torque from the drive motor may be transmitted to only one of the drive rollers in the pair of drive rollers. One of the gears, the inner gear 53 and the outer gear 54, may be omitted. The number of drive units is not limited to two; it can be three or more. The pipe manufacturing apparatus is not limited to a self-propelled pipe manufacturing apparatus 30. It may also be a push-type pipe manufacturing apparatus that pushes the manufactured rehabilitated pipe forward, or a traction-type pipe manufacturing apparatus that uses a traction mechanism to pull the pipe end of the manufactured rehabilitated pipe forward. [Industrial applicability]

[0054] The present invention can be applied, for example, to the rehabilitation technology of aging sewer pipes. [Explanation of Symbols]

[0055] 1 Existing pipe 9 Rehabilitation pipe 9e Tube end 10 Strip-shaped member 11 Band body 13. First mating section 14. Second mating section 19. Following section L 19 Following belt orbit 20 Reinforcement strip 24 Outer perimeter groove 24b Groove bottom 25 Reinforcement band main body 26 Resin coating layer 30 Pipe manufacturing equipment for rehabilitation of existing pipes 31. Device frame 40 Drive unit 41 Drive Unit 42 Drive Unit 44 Drive motor 442 Motor shaft (output shaft) 45 drive roller pair 45A, 45C drive roller pair 46 drive roller pair 46B, 46D drive roller pair 47 Inner drive roller (drive roller) 47A, 47B, 47C, 47D Inner drive rollers 472 Roller shaft (roller axis) 48 Outer drive roller (drive roller) 48A, 48B, 48C, 48D Outer drive rollers 481 Roller section 482 Roller shaft (roller axis) 49 Torque transmission mechanism 50 Motor-side gear 51 Roller Gear vs. 51A, 51C Roller Gear Pair 52 Roller Gear vs. 52B, 52D Roller Gear 53 Inner roller side gear (roller side gear) 53A, 53B, 53C, 53D Inner roller side gear (roller side gear) 54 Outer roller side gear (roller side gear) 54A, 54B, 54C, 54D Outer roller side gear (roller side gear) 60 rotation coupling mechanism 61 Rotating connecting shaft 62 Angle adjustment member 63 Shaft 63a Male screw 64 Operating handles 71 Connected part 72 Connected part 73 Screw receiving section 74 Rotating support section

Claims

1. A pipe manufacturing apparatus for rehabilitating existing pipes, which manufactures a spiral-shaped rehabilitation pipe from a long strip-shaped member and lines the inner circumference of the existing pipe with it. The aforementioned strip-shaped member is equipped with a drive unit that feeds the trailing strip portion of the unmanufactured pipe along the trailing strip track to the pipe end of the rehabilitated pipe being manufactured and incorporates it into the rehabilitated pipe. The drive unit has a plurality of drive units arranged along the trailing track, A pipe-making apparatus characterized in that each of the drive units includes two pairs of drive rollers arranged along the trailing belt track, each having a pair of drive rollers that clamp the trailing belt; one drive motor; and a torque transmission mechanism that connects the roller shafts of each pair of drive rollers to the output shaft of the drive motor in a torque-transmitting manner.

2. The pipe-making apparatus according to claim 1, wherein the drive torques input from the drive motor in each drive unit to the two pairs of drive rollers are equal to each other, and the drive torques of the multiple drive units are equal to each other.

3. The torque transmission mechanism in each drive unit includes a motor-side gear provided on the output shaft and roller-side gears provided on the roller shafts of the two pairs of drive rollers, respectively, and meshed with the motor-side gear. The number of teeth on the roller-side gears provided on the two drive rollers of each drive unit, which are arranged on the same side in the inward and outward directions intersecting the trailing track, are equal to each other. The pipe-making apparatus according to claim 1, wherein the number of teeth of the roller-side gears on the same side of the multiple drive units are equal to each other.

4. The pipe-making apparatus according to any one of claims 1 to 3, wherein two adjacent drive units along the trailing track are connected via a rotary coupling mechanism so as to be angle-adjustable around a rotary coupling shaft parallel to the roller shaft.

5. The pipe-making apparatus according to claim 4, wherein the rotational coupling mechanism includes an angle adjustment member spanning the drive units such that the connected portions of the two drive units, which are far from the rotational coupling shaft, can be moved closer to and further apart from each other.

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