Pipe manufacturing equipment for rehabilitation of existing pipes

Abstract

To provide a small, self-propelled pipe-making device that can avoid or mitigate interference between the pipe-making device and the existing pipe, even when there is almost no gap between the raised portion of the pipe end of the rehabilitated pipe and the inner surface of the existing pipe, thereby reducing wear and tear on the pipe-making device. [Solution] A pipe-making device 10 is used to manufacture a spiral-shaped rehabilitated pipe 9, consisting of a long strip-shaped member 10, along the inner circumference of the existing pipe 1. A pair of drive rollers 31 and 32 of the pipe-making device 20 grip the trailing strip portion 19 of the unmade pipe of the strip-shaped member 10 and push it diagonally toward the rear, causing the opposing edges 10a and 10b of the pipe end 9 of the rehabilitated pipe 9 and the trailing strip portion 19 to interlock with each other, and simultaneously propelling the pipe-making device 10 in the spiral winding direction. A pipe end guide 63 is provided at the bottom 21b of the device body 21 to guide the pipe end 9e of the rehabilitated pipe 9 from the outer circumference. The pipe end guide 63 includes a pair of cantilevered claw portions 67 that extend toward the rear from a cantilevered support position 68, each in an independent cantilevered state. These cantilevered claw portions 67 guide the raised portion 15 for interlocking of the pipe end 9e from both sides.

Description

[Technical Field]

[0001] The present invention relates to a pipe manufacturing apparatus for rehabilitating an existing pipe by manufacturing a spiral tubular rehabilitation pipe along the inner circumference of the existing pipe, and in particular to a so-called self-propelled pipe manufacturing apparatus that is propelled (self-propelled) along the spiral winding direction of the rehabilitation pipe along with pipe manufacturing. [Background Art]

[0002] An existing pipe rehabilitation method is known, in which a long strip-shaped member (profile) is spirally wound along the inner circumference of an existing pipe such as an aged sewer pipe using a pipe manufacturing apparatus to manufacture a spiral tubular rehabilitation pipe (see Patent Documents 1, 2, etc.). For example, Patent Document 1 discloses a small self-propelled pipe manufacturing apparatus that is smaller than the diameter of the rehabilitation pipe. The pipe manufacturing apparatus includes an apparatus main body arranged at the pipe end portion on the forward extension side in the pipe axis direction of the rehabilitation pipe during pipe manufacturing, and at least one pair of driving rollers provided on the apparatus main body. The unrear subsequent strip portion of the strip-shaped member connected to the pipe end portion is clamped by the pair of driving rollers and obliquely pushed toward the pipe end portion, so that the rehabilitation pipe is extended by manufacturing. The pipe manufacturing apparatus is propelled (self-propelled) in the spiral winding direction by the reaction force of the pushing.

[0003] An inner arm extends from the apparatus main body of the pipe manufacturing apparatus toward the rear side of propulsion, and a pressing member roller is provided at the tip end thereof. The pressing member roller presses from the inner circumferential side of the pipe the fitting position where the concave-convex fitting between the pipe end portion and the subsequent strip portion is performed. An outer arm extends from the bottom of the main body facing the outer circumferential side of the pipe in the apparatus main body toward the rear side of propulsion, and a pipe end guide is provided at the tip end thereof. The pipe end guide receives the fitting position from the outer circumferential side of the pipe.

[0004] Patent Document 2 discloses a small self-propelled pipe manufacturing apparatus having a brake mechanism. By means of the brake mechanism, the propulsion amount of the pipe manufacturing apparatus is made smaller than the feeding amount of the subsequent strip portion by the driving rollers, so that the diameter of the rehabilitation pipe can be expanded and the pipe can be manufactured in such a way that it is attached to the inner circumferential surface of the existing pipe.

[0005] The strip-shaped members (profiles) of Patent Documents 1 and 2 include a flat strip-shaped base portion that defines the inner circumferential surface of the rehabilitation pipe, a female fitting portion formed on one edge in the width direction of the strip, a male fitting portion formed on the other edge in the width direction of the strip, and a plurality of outer circumferential ribs that protrude from the base portion toward the outer circumference of the pipe. The female fitting portion is composed of a V-shaped raised portion that rises toward the outer circumference of the pipe. A fitting groove is formed in the raised portion. In the rehabilitation pipe, the male fitting portion is fitted into the fitting groove. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2023-158865 (Figures 1B, 3A) [Patent Document 2] Japanese Patent Publication No. 2023-071364 (Figures 2 and 3) [Overview of the project] [Problems that the invention aims to solve]

[0007] In the strip-shaped members (profiles) disclosed in the aforementioned Patent Documents 1 and 2, the height of the outer rib is greater than the height of the raised portion. Therefore, even when manufacturing a rehabilitated pipe by attaching it to the inner surface of an existing pipe, a gap equal to the height difference between the outer rib and the raised portion is formed between the inner surface of the existing pipe and the raised portion at the end of the rehabilitated pipe. The pipe end guide of the pipe manufacturing device is positioned in this gap. Thus, interference between the pipe end guide and the existing pipe can be avoided.

[0008] On the other hand, when a rehabilitated pipe is manufactured by attaching a strip-shaped member (profile) with an outer rib of roughly the same height as the raised portion to the inner surface of an existing pipe, there is almost no gap between the raised portion at the end of the rehabilitated pipe and the inner surface of the existing pipe, i.e., there is almost no space to place a pipe end guide. As a result, the pipe end guide, and consequently the pipe manufacturing equipment, is prone to interference with the existing pipe and wear. In view of these circumstances, the present invention aims to provide a small, self-propelled pipe-making device that can avoid or mitigate interference between the pipe-making device and the existing pipe, even when there is almost no gap between the raised portion of the pipe end of the rehabilitated pipe and the inner surface of the existing pipe, thereby reducing wear and tear on the pipe-making device. [Means for solving the problem]

[0009] To solve the aforementioned problems, the present invention provides a pipe-making device for rehabilitating an existing pipe, which is positioned at the pipe end on the extension side in the pipe axis direction of a spiral-shaped rehabilitated pipe being manufactured from a long strip-shaped member that is spirally wound along the inner circumference of an existing pipe, and which interlocks the opposing edges of the subsequent strip portion of the unmanufactured pipe connected to the pipe end of the strip-shaped member with the pipe end and propels it in the spiral winding direction, The apparatus comprises a main body positioned on the inner circumference of the pipe end so as to be movable in the spiral winding direction, with the longitudinal direction of the apparatus facing the spiral winding direction, A drive unit is provided on the main body of the device, having at least one pair of drive rollers whose axes are oriented in the device width direction perpendicular to the longitudinal direction of the device, and which obtains force for the concave and concave fitting and propulsion by clamping the trailing belt portion with the drive rollers and pushing it diagonally toward the rearward side of the device longitudinal direction and toward the outer circumference of the pipe, A pressing member is provided on the main body of the device and presses from the inner circumference of the pipe the fitting portion where the grooves and protrusions of the pipe end and the subsequent band portion are fitted together, A pipe end guide is provided at the bottom of the device body facing the outer circumference of the pipe in the height direction of the device which is perpendicular to the longitudinal direction and width direction of the device, and which receives the pipe end from the outer circumference. The pipe end guide is characterized in that it includes a pair of cantilevered claws that extend from a cantilevered support position on the forward side of the pressing member toward the rearward side of the propulsion in an independent cantilevered state, and guide from both sides in the width direction of the device a raised portion for interlocking grooves that protrudes toward the outer circumference of the pipe at the edge of the pipe end.

[0010] "Each being in a separate cantilever state" means that a pair of cantilever claws extend separately without being connected to each other at any position in the extension direction other than the cantilever support position, and the rearward end of each is an open end (free end) separated from the other. This pipe-making apparatus does not require a connecting section to connect a pair of cantilevered claw sections that straddle the raised portion at the end of the rehabilitated pipe. Therefore, when manufacturing a rehabilitated pipe by attaching it to the inner surface of an existing pipe, even if there is almost no gap between the raised portion at the end of the rehabilitated pipe and the inner surface of the existing pipe, interference between the connecting section and, consequently, the pipe end guide and the existing pipe can be avoided or mitigated, thereby reducing wear on the pipe end guide. The pair of cantilevered claws guide the raised portion at the end of the rehabilitation pipe from both sides, preventing the raised portion from displacing (escape displacement) or deforming (opening) during the interlocking of the pipe end and the subsequent band. Therefore, the pipe end and the subsequent band can be stably interlocked. Furthermore, when the pipe-making device is positioned at the top of the pipe, the pipe end guide, which includes a pair of cantilevered claws, is locked to the pipe end from the outer circumference of the pipe, thereby preventing the pipe-making device from falling.

[0011] Preferably, the open end of the cantilever claw portion facing the rearward side of the propulsion mechanism is positioned near the retaining member in the longitudinal direction of the device. This allows the raised portion near the fitting point to be guided from both sides by the open ends of the pair of cantilevered claws. Therefore, displacement of the raised portion at the fitting point and opening of the fitting groove can be reliably prevented, and the pipe end and the subsequent band can be stably fitted together.

[0012] Preferably, the height dimension of the cantilever claw portion along the height direction of the device is less than or equal to the depth of the outer peripheral groove on the side of the raised portion. This allows the entire cross-section of the cantilever claw to be housed inside the raised lateral outer groove. Therefore, it is possible to prevent the cantilever claw from protruding beyond the raised portion towards the outer circumference of the pipe, thereby reliably preventing wear on the cantilever claw and, consequently, the pipe end guide.

[0013] Preferably, the cantilevered claw portion is curved in an arc shape along the extension direction. More preferably, the curvature of the cantilever claw portion is matched to the curvature of the rehabilitated pipe. This prevents wear on the cantilever claw portion while enabling smooth pipe manufacturing of the rehabilitated pipe.

[0014] Preferably, a trailing belt guide is provided at the bottom of the device, extending forward in the width direction of the device from the pipe end guide, near the drive unit and toward the rearward side of the propulsion, and fitting into the inter-rib outer circumferential groove between adjacent outer ribs in the trailing belt portion pushed out from the drive unit. The trailing belt guide prevents the trailing belt from deviating from its regular trajectory. This allows for a stable interlocking of the pipe end and the trailing belt, enabling the smooth manufacturing of the rehabilitated pipe. [Effects of the Invention]

[0015] According to the present invention, even if there is almost no gap between the raised portion at the end of the rehabilitated pipe and the inner surface of the existing pipe, interference between the pipe end guide and, consequently, the pipe manufacturing device and the existing pipe can be avoided or mitigated, thereby reducing wear and tear on the pipe manufacturing device. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 shows one embodiment of the present invention, and is a cross-sectional view along the pipe axis of an existing pipe undergoing rehabilitation work by a pipe manufacturing device. [Figure 2] Figure 2 is a front view of the pipe manufacturing apparatus during the rehabilitation of the existing pipe, viewed from the direction along the line II-II in Figure 1. [Figure 3] Figure 3(a) shows a strip-shaped member (profile) used in the rehabilitation work, and is a cross-sectional view taken along the line IIIa-IIIa in Figure 2. Figure 3(b) is a cross-sectional view taken along the line IIIb-IIIb in Figure 2. Figure 3(c) is a cross-sectional view taken along the line IIIc-IIIc in Figure 2. Figure 3(d) is a cross-sectional view taken along the line IIId-IIId in Figure 2. [Figure 4]Fig. 4 is a plan view of an outer arm including a trailing belt guide and a pipe end guide of the pipe manufacturing apparatus. [Figure 5] Fig. 5(a) is a front cross-sectional view of the trailing belt guide taken along line Va-Va in Fig. 4. Fig. 5(b) is a front cross-sectional view of the pipe end guide taken along line Vb-Vb in Fig. 4. [Figure 6] Fig. 6 is a front cross-sectional view taken along line VI-VI in Fig. 1, showing the pipe manufacturing apparatus during rehabilitation work when it is located near the crown of the existing pipe (the imaginary line in Fig. 1). DESCRIPTION OF EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a state of rehabilitating an aged existing pipe 1. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried underground, but the present invention is not limited thereto, and may be a water supply pipe, an agricultural water pipe, a gas pipe, a hydraulic power pipe, a tunnel, or the like.

[0018] As shown in Figs. 1 and 2, the existing pipe 1 is rehabilitated by lining a rehabilitation pipe 9 along the inner circumference of the existing pipe 1. The rehabilitation pipe 9 is a spiral pipe formed by spirally winding a long belt-shaped member 10 (profile) made of synthetic resin such as polyvinyl chloride.

[0019] As shown in Fig. 3(a), the belt-shaped member 10 integrally includes a flat belt-shaped belt base 11, a plurality of outer peripheral ribs 12, and male and female fitting portions 13 and 14, and extends long in the belt length direction (direction perpendicular to the paper surface in Fig. 3(a)). A plurality of outer peripheral ribs 12 are provided on the belt base 11 at intervals in the belt width direction (left-right direction in Fig. 3(a)). The outer peripheral ribs 12 protrude from the belt base 11 toward the outer peripheral side (the outer peripheral side of the rehabilitation pipe 9, the lower side in Fig. 3(a)). A reinforcing strip 16 made of metal such as steel is embedded inside the outer peripheral rib 12. An inter-rib outer peripheral groove 18 (outer peripheral groove) is formed between adjacent outer peripheral ribs 12.

[0020] The cross-sectional shape of the strip-shaped member 10 is not limited to that shown in the illustration, and various modifications can be made. The reinforcing strip 16 may be omitted. A metal reinforcing strip with an irregular cross-section may be fitted onto the outer circumference of the synthetic resin strip-shaped member 10.

[0021] A raised portion 15 for interlocking grooves and protrusions is provided on one edge 10a in the width direction of the strip-shaped member 10 (the right side in Figure 3(a)). The raised portion 15 has a roughly V-shaped cross-section and is raised toward the outer circumference (the outer circumference of the rehabilitated pipe 9, the lower side in Figure 3(a)).

[0022] The female fitting portion 13 is formed by the raised portion 15. A fitting groove 13a is formed in the female fitting portion 13 which is made up of the raised portion 15. The fitting groove 13a opens to the inner circumference side (upper side in Figure 3(a)) of the strip-shaped member 10.

[0023] The height of the raised portion 15 on the outer circumference side (lower side in Figure 3(a)) is approximately the same as the protruding height of the outer circumference rib 12. The raised end 15e of the raised portion 15 and the protruding end 12e of the outer circumference rib 12 are positioned at approximately the same height along the thickness direction of the strip-shaped member 10 (vertical direction in Figure 3(a)).

[0024] Between the raised portion 15 of the strip-shaped member 10 and the outer peripheral rib 12A immediately adjacent to it, an inner raised lateral outer peripheral groove 17 is formed. The inner raised lateral outer peripheral groove 17 opens outwards (downwards in Figure 3(a)).

[0025] A male fitting portion 14 is formed on the edge 10b of the belt base 11 and, consequently, on the other end side in the width direction of the belt-shaped member 10 (the left side in Figure 3(a)). The male fitting portion 14 is a projection that protrudes from the belt base portion 11 toward the outer circumference (the outer circumference of the rehabilitated pipe 9, the lower side in Figure 3(a)).

[0026] As shown in Figures 3(b) to 3(d), in the spiral-shaped rehabilitation pipe 9, the strip-shaped member 10 is wound spirally, and adjacent edges 10a and 10b that are one turn apart are overlapped, and the fitting portions 13 and 14 are joined by interlocking interlocking. The male fitting portion 14 is fitted into the fitting groove 13a. Between two adjacent wound portions 9a of the rehabilitation pipe 9, a raised lateral outer peripheral groove 9d is formed by the raised portion 15 of one wound portion 9a and the outer peripheral rib 12B of the other wound portion 9a. The raised lateral outer peripheral groove 9d opens to the outer circumference of the pipe (downward in Figure 3(d)). Therefore, raised lateral outer peripheral grooves 17 and 9d are provided on both sides in the pipe axis direction, flanking the raised portion 15 of the rehabilitation pipe 9.

[0027] As shown in Figures 1 and 2, a pipe manufacturing device 20 for rehabilitating an existing pipe is positioned at the pipe end 9e on the forward extension side (right side in Figure 1) along the pipe axis L9 of the rehabilitated pipe 9 (the pipe portion manufactured prior to the strip-shaped member 10) that is in the process of being manufactured. The pipe manufacturing device 20 is a small, self-propelled pipe manufacturing device that, while manufacturing the rehabilitated pipe 9, is propelled (self-propelled) along the inner circumference of the existing pipe 1 in a counterclockwise spiral winding direction in Figure 2. The pipe manufacturing device 20 causes the fitting portions 14.13 of the opposing edges 10b and 10a of the unmanufactured strip portion 19 connected to the pipe end 9e of the strip-shaped member 10 and the pipe end 9e to fit together with a concave and concave joint (Figures 3(b) to 3(d)), thereby advancing the manufacturing of the rehabilitated pipe 9.

[0028] As shown in Figure 2, the pipe-making apparatus 20 comprises a frame-shaped or housing-shaped apparatus body 21 and a drive unit 30. The apparatus body 21 includes a drive housing 22, an inner arm 50, and an outer arm 60. The apparatus body 21 is positioned to be movable in the spiral winding direction on the inner circumference of the pipe end 9e of the rehabilitated pipe 9. The longitudinal direction of the apparatus body 21 and thus the longitudinal direction of the pipe-making apparatus 20 (hereinafter referred to as the "apparatus longitudinal direction LD") is oriented in the spiral winding direction. The length of the apparatus body 21 along the apparatus longitudinal direction LD is about a fraction of a fraction to a tens of fractions of the circumference of the rehabilitated pipe 9. The pipe-making apparatus 20 has a non-internal circumference restricting structure and does not have an internal circumference restricting body such as a link roller that restricts the pipe end 9e from the inner circumference side. The pipe end 9e other than the part in which the pipe-making apparatus 20 is positioned is open to the inner circumference side of the pipe.

[0029] As shown in Figure 2, a drive housing 22 is provided approximately in the center of the longitudinal direction LD of the apparatus body 21. A drive unit 30 is mounted in the drive housing. The drive unit 30 has at least a pair of drive rollers 31 and 32 and a drive motor 33 that drives these drive rollers. The pair of drive rollers 31 and 32 face each other in a direction approximately aligned with the height direction of the pipe-making apparatus 20 (hereinafter referred to as "apparatus height direction HD"). The apparatus height direction HD is directed toward the diameter direction of the rehabilitated pipe 9. The axes of the drive rollers 31 and 32 are directed toward the width direction of the pipe-making apparatus 20 (hereinafter referred to as "apparatus width direction WD"). As shown in Figure 1, the apparatus width direction WD is perpendicular to the longitudinal direction LD and the height direction HD, and is approximately aligned with the pipe axis L9 of the rehabilitated pipe 9. More precisely, the apparatus width direction WD is inclined with respect to the pipe axis L9 of the rehabilitated pipe 9 by the amount of the helical lead angle of the rehabilitated pipe 9.

[0030] As shown in Figure 2, the trailing belt portion 19 is introduced between a pair of drive rollers 31 and 32, and is clamped between these drive rollers 31 and 32, and is pushed diagonally toward the rearward side (left side in Figure 2) and toward the outer circumference of the pipe, thereby generating a pushing force. This force causes the female fitting portion 13 of the pipe end portion 9e and the male fitting portion 14 of the trailing belt portion 19 to engage in a concave-concave

[0031] As shown in Figure 2, a bracing brake mechanism 40 is provided on the pipe body 21, preferably on the forward side (right side in Figure 2). The bracing brake mechanism 40 includes a brake shoe 41 and a bracing rod 42. The brake shoe 41 is preferably formed in the shape of a long plate that is curved in an arc to match the curvature of the rehabilitated pipe 9. The brake shoe 41 is in contact with or close to the inner circumferential surface of the pipe end 9e of the rehabilitated pipe 9.

[0032] The tension rod 42 of the tension-type brake mechanism 40 is stretched between the drive housing 22 and the brake shoe 41 in the central part of the device body 21 so as to be able to tension. The tension rod 42 includes a turnbuckle 42a and is extendable and retractable.

[0033] The bracing brake mechanism 40 is provided with one or more (two in this case) restrictive guides 43. Each restrictive guide 43 consists of a rotating body with its axis of rotation oriented in the device width direction WD, and is attached to the pipe end 9e from the extended forward side (the side towards the viewer in Figure 2). This prevents the pipe-making device 20 from tilting or becoming misaligned. Furthermore, the bracing brake mechanism 40 in the pipe-making apparatus 20 is not provided with a brake receiving member that faces the brake shoe 41 and receives the pipe end 9e from the outer circumference side of the pipe.

[0034] As shown in Figure 2, an inner arm 50 and an outer arm 60 are provided on the device body 21 on the rearward side of the drive housing 22 (left side in Figure 2). The inner arm 50 has a double-arm structure including a support arm portion 51 and an elevation arm portion 52. The support arm portion 51 extends from near the drive housing 22, i.e., the drive unit 30, toward the rearward side of the drive (left side in Figure 2). The support arm portion 51 is along the inner circumference of the portion 19a of the trailing belt portion 19 that is pushed out from the drive unit 30. The elevation arm portion 52 is connected to the tip of the support arm portion 51 so as to be able to elevation and rotate in the device height direction HD. An intermediate guide roller 53 is rotatably provided on the connecting shaft 53c between these arm portions 51 and 52. The intermediate guide roller 53 is positioned in contact with or close to the intermediate portion of the trailing band portion 19a in its extending direction, thereby guiding the trailing band portion 19a from the inner circumferential side of the pipe (upper side in Figure 2).

[0035] The elevation arm 52 extends further to the rearward side (to the left in Figure 2) from the support arm 51. A retaining member 54 is supported at the tip of the elevation arm 52. The retaining member 54 is composed of a cylindrical rotating roller with its axis of rotation oriented in the device width direction WD (orthogonal to the plane of the paper in Figure 2). The retaining member 54 straddles the pipe end 9e and the subsequent belt 19. The retaining member 54 presses the fitting point 9p or a nearby point where the pipe end 9e and the subsequent belt 19 engage in a groove-and-groove fitting from the inner circumference side of the pipe (upper side in Figure 2). The retaining member 54 and the fitting point 9p may be offset by several centimeters to tens of centimeters in the circumferential direction of the pipe.

[0036] An elevation adjustment rod 55 is placed between the support arm 51 and the elevation arm 52. The elevation adjustment rod 55 adjusts the elevation angle of the elevation arm 52 relative to the support arm 51.

[0037] As shown in Figure 2, an outer arm 60 is positioned at the bottom of the device 21b, which is at the bottom of the device in the height direction HD (outer circumference of the pipe, lower in Figure 2) than the inner arm 50 of the device body 21. The outer arm 60 extends from near the drive housing 22, i.e., the drive unit 30, toward the rearward side of the propulsion (leftward in Figure 2). The outer peripheral side surface 60b of the outer arm 60 is preferably curved in an arc shape to match the curvature of the inner surface of the existing pipe 1. The rearward end 60e of the outer arm 60 (left end in Figure 2) is positioned near the intermediate guide roller 53 in the circumferential direction of the pipe, or between the intermediate guide roller 53 and the retaining member 54. The outer arm 60 does not reach the retaining member 54, and therefore does not reach the fitting point 9p.

[0038] As shown in Figures 2 and 3(b), a trailing belt guide 62 and a pipe end guide 63 are provided on the inner circumference side (upper side in Figure 2) of the outer arm 60 at the bottom 21b of the device. The trailing belt guide 62 guides the trailing belt portion 19a from the outer circumference side of the pipe (lower side in Figure 2). The pipe end guide 63 guides the pipe end 9e from the outer circumference side of the pipe.

[0039] More specifically, as shown in Figures 3(b) and 4, the trailing belt guide 62 is positioned in the portion of the outer arm 60 that extends forward (to the right in Figure 3(b) and downward in Figure 4) of the pipe end guide 63 in the device width direction WD. As shown in Figures 2 and 5(a), the trailing belt guide 62 extends from near the drive housing 22, i.e., the drive unit 30, toward the rearward side of the propulsion (to the left in Figure 5), and its height along the device height direction HD decreases as it moves toward the rearward side of the propulsion. Furthermore, the trailing belt guide 62 extends further toward the rearward side of the propulsion than the outer arm 60. As shown in Figure 2, the rearward end 62e of the trailing belt guide 62 is positioned near the retaining member 54 in the device longitudinal direction LD, i.e., the circumferential direction of the pipe.

[0040] As shown in Figures 3(b) and 3(c), preferably, the cross-sectional shape of the inner circumference side (upper side in Figure 3(b)) of the trailing band guide 62 is formed to conform to the outer circumference shape of the trailing band portion 19a and thus the band-shaped member 10. More preferably, the trailing band guide 62 includes one or more (e.g., two) outer circumference groove guide portions 64. Each outer circumference groove guide portion 64 protrudes from the outer arm 60 toward the top side (inner circumference side, upper side in Figure 3(b)) in the device height direction HD and fits into the corresponding outer circumference groove 18 of the trailing band portion 19a. Thus, the trailing band guide 62 fits into the outer circumference groove 18. As shown in Figure 4, the outer circumference groove guide portion 64 extends in the longitudinal direction LD of the device in a plan view. As shown in Figure 5(a), the protruding height of the outer circumference groove guide portion 64 decreases toward the rearward side of the propulsion (left side in Figure 5(a)). The inner circumferential surface 64a of the outer circumferential groove guide portion 64 is curved in a roughly arc-shaped concave form.

[0041] As shown in Figures 3(b) and 4, the pipe end guide 63 is provided on the outer arm 60, extending rearward in the device width direction WD from the trailing band guide 62 (left side in Figure 3, upper side in Figure 4). As shown in Figure 2, the pipe end guide 63 is positioned on the bottom side (outer circumference side of the pipe, lower side in Figure 2) in the device height direction HD from the inner arm 50.

[0042] As shown in Figure 4, the pipe end guide 63 includes a pair of pipe end guide claws 65. The pair of pipe end guide claws 65 are arranged in close proximity and parallel to each other in the device width direction WD. As shown in Figures 2 and 4, the pipe end guide claws 65 extend along the outer arm 60 from near the drive housing 22 and thus the drive unit 30 toward the rear of the propulsion (left side in Figure 4). As shown in Figure 5(b), viewed from the device width direction WD (orthogonal to the plane of the paper in Figure 5(b)), the pipe end guide claws 65 are curved in an arc along the device longitudinal direction LD. Preferably, the curvature of the pipe end guide claws 65 matches the curvature of the rehabilitated pipe 9. The height dimension of the pipe end guide claws 65 is substantially constant along the entire length of the pipe end guide claws 65.

[0043] As shown in Figures 4 and 5(b), the pipe end guide claw 65 further extends rearward (to the left in Figure 4) beyond the outer arm 60. Therefore, the pipe end guide claw 65 includes a base claw portion 66 provided on the outer arm 60 and a cantilever claw portion 67. The base claw portion 66 is integral with the outer arm 60 and protrudes from the inner circumferential side of the outer arm 60 toward the top side (inner circumferential side of the pipe, upward in Figure 2) in the height direction HD of the device.

[0044] The cantilever claw portion 67 extends further rearward (to the left in Figure 4) than the rearward end 60e of the outer arm 60. The rearward end 60e of the outer arm 60 constitutes the cantilever support position 68 of the cantilever claw portion 67. As shown in Figure 2, the cantilever support position 68 is located further forward (to the right in Figure 2) than the retaining member 54.

[0045] As shown in Figures 4 and 5(b), the cantilevered claw portions 67 of the pair of pipe end guide claws 65 extend independently in a cantilevered state toward the rearward direction from the cantilevered support position 68. That is, the pair of cantilevered claw portions 67 extend separately from each other at each position in the extension direction, excluding the cantilevered support position 68. The rearward end 67e of each cantilevered claw portion 67 is an open end (free end) separated from the other cantilevered claw portion 67. Therefore, the rearward ends 67e of the pair of cantilevered claw portions 67 are relatively displaceable from each other.

[0046] As shown in Figure 2, the open end 67e of the cantilever claw portion 67 is positioned near the retaining member 54 in the longitudinal direction LD of the device, i.e., in the circumferential direction of the pipe, and thus near the fitting portion 9p. The open end 67e of the cantilever claw portion 67 and the retaining member 54 may be offset by several centimeters to more than ten centimeters in the circumferential direction of the pipe.

[0047] As shown in Figures 3(b) and 3(c), a pair of pipe end guide claws 65, including the cantilevered claw portion 67, guide the raised portion 15 at the pipe end 9e from both sides in the device width direction WD along the pipe axis direction. Preferably, the pair of pipe end guide claws 65 guide the raised portion 15 in such a way that it allows the required deformation of the raised portion 15 when fitted with the male fitting portion 14 of the subsequent band portion 19, while restricting larger deformations than required, such as the opening deformation described later.

[0048] Of the pair of pipe end guide claws 65, the cross-sectional shape of the pipe end guide claw 65A on the rearward side extending in the device width direction WD (left side in Figure 3) is matched to the cross-sectional shape of the raised lateral outer peripheral groove 17 inside the band. The height dimension of the pipe end guide claw 65A along the device height direction HD is less than or equal to the depth of the raised lateral outer peripheral groove 17. The pipe end guide claw 65A is inserted into the raised lateral outer peripheral groove 17 inside the band. Preferably, the entire cross-section of the pipe end guide claw 65A is contained within the raised lateral outer peripheral groove 17 inside the band.

[0049] Of the pair of pipe end guide claws 65, the cross-sectional shape of the pipe end guide claw 65B on the extending forward side in the device width direction WD (right side in Figure 3) is matched to the cross-sectional shape of the inter-winding raised lateral outer circumference groove 9d. The height dimension of the pipe end guide claw 65B along the device height direction HD is less than or equal to the depth of the raised lateral outer circumference groove 9d. As shown in Figure 3(c), the pipe end guide claw 65B is inserted into the inter-winding raised lateral outer circumference groove 9d near the fitting location 9p. Preferably, the entire cross-section of the pipe end guide claw 65A is contained within the inter-winding raised lateral outer circumference groove 9d.

[0050] The existing pipe 1 is rehabilitated by the aforementioned pipe-making apparatus 20 in the following manner. As shown in Figure 1, the unfinished strip portion 19 of the strip-shaped member 10 is unfurled from the discharge drum 6 on the ground, passes through the manhole 4, is routed into the rehabilitation pipe 9 being manufactured inside the existing pipe 1, and is sent to the pipe manufacturing device 20 on the inner circumference of the pipe end 9e.

[0051] As shown in Figure 2, the trailing belt portion 19 is introduced between the drive rollers 31 and 32 of the drive unit 30, and is pushed diagonally toward the rear and outer circumference of the pipe by the rotational drive of the drive roller 31.

[0052] The extruded trailing band portion 19a is aligned with the trailing band guide 62 and guided from the outer circumference by the trailing band guide 62 (Figure 2). The outer circumference groove guide portion 64 of the trailing band guide 62 slides into the outer circumference groove 18 of the trailing band portion 19a (Figure 3(b)). Furthermore, the intermediate portion of the trailing band portion 19a in the extension direction is guided from the inner circumference side of the pipe (upper side in Figure 2) by the intermediate guide roller 53.

[0053] The male fitting portion 14 of the trailing band portion 19a is pressed into the fitting groove 13a of the female fitting portion 13 of the pipe end portion 9e at the fitting location 9p, resulting in a recessed-protrusion fitting (Figure 3(d)). Preferably, by the adhesive pipe manufacturing method described later, the pipe end portion 9e and the trailing band portion 19a at the fitting location 9p are pressed against the inner circumferential surface of the existing pipe 1, thereby obtaining a fitting reaction force from the existing pipe 1. As a result, the opposing edges of the trailing band portion 19 and the pipe end portion 9e are joined together. Consequently, the trailing band portion 19 is incorporated into the rehabilitated pipe 9, and the pipe manufacturing of the rehabilitated pipe 9 progresses. In addition, the fitting generates a propulsion reaction force, causing the pipe manufacturing device 20 to be propelled (self-propelled) toward the forward direction (counterclockwise in Figure 2).

[0054] The fitting point 9p or a nearby point is pressed from the inner circumference side of the pipe by the retaining member 54. Furthermore, the raised portion 15 at the pipe end 9e is guided from both sides by a pair of pipe end guide claws 65 of the pipe end guide 63. In particular, the cantilevered claw portion 67 of the pair of pipe end guide claws 65 guides the raised portion 15 near the fitting location 9p at the pipe end 9e from both sides (Figures 3(b) to 3(c)). This prevents the raised portion 15 from being displaced to escape (escape displacement) or the fitting groove 13a from being deformed to open wide (opening deformation) immediately before or during interlocking.

[0055] Furthermore, the trailing belt guide 62 guides the trailing belt portion 19a from the outer circumference of the pipe, preventing the trailing belt portion 19a from deviating from its normal trajectory, and thus more reliably preventing displacement and opening deformation of the raised portion 15 at the fitting point 9p. This ensures that the pipe end portion 9e and the subsequent band portion 19 are securely and stably fitted together, preventing poor fitment and allowing the rehabilitated pipe 9 to be manufactured smoothly. Even if there are steps or bends in the pipe axis within the existing pipe 1, the relief displacement and opening deformation of the raised portion 15, and consequently poor fitting, can be reliably prevented.

[0056] During pipe manufacturing, the bracing rod 42 of the bracing brake mechanism 40 is extended and braced, causing the brake shoe 41 to press against the inner circumferential surface of the pipe end 9e. This applies a braking force to the pipe manufacturing device 20 as it is being propelled, and the amount of the trailing belt section 19 fed by the drive unit 30 becomes greater than the amount of propulsion by the pipe manufacturing device 20. As a result, the rehabilitated pipe 9 is enlarged in diameter and manufactured so that it adheres to the inner circumferential surface of the existing pipe 1. Since the bracing brake mechanism 40 does not have a brake receiving member that receives the pipe end 9e from the outer circumference of the pipe, there is no interference between such a brake receiving member and the existing pipe 1, and the brake receiving member does not get worn out. Furthermore, when the tension rod 42 is retracted, the braking force is reduced or released, and the rehabilitation pipe 9 is reduced in diameter.

[0057] As shown in Figure 3(c), in the adhesive pipe manufacturing process, the raised end 15e of the raised portion 15 at the pipe end 9e almost abuts against the inner surface of the existing pipe 1, so there is almost no gap between the raised portion 15 and the inner surface of the existing pipe 1. On the other hand, the pipe manufacturing device 20 does not have a connecting portion that straddles the raised portion 15 at the pipe end 9e from the outer surface of the pipe and connects the ends 67e of the pair of cantilevered claw portions 67. Moreover, since the entire cross-section of the cantilevered claw portion 67 is housed inside the outer surface grooves 17, 9d on the sides of the raised portion, it is possible to prevent the cantilevered claw portion 67 from protruding from the raised portion 15 towards the outer surface of the pipe (downward in Figure 3(c)). Therefore, even if there is almost no gap between the raised portion 15 at the pipe end 9e and the inner surface of the existing pipe 1 during adhesive pipe manufacturing, interference between the pipe end guide 63 and the existing pipe 1 can be avoided or mitigated, and wear of the pipe end guide 63 can be reduced.

[0058] As shown in Figure 6, the pipe-making device 20 is propelled spirally forward (towards the foreground in Figure 6) while circling along the inner circumference of the existing pipe 1. When the pipe-making device 20 is positioned near the top 9c of the rehabilitated pipe 9, the pipe end guide 63 is locked onto the pipe end 9e of the top 9c from the outer circumference side, i.e., from above. This prevents the pipe-making device 20 from falling due to its own weight. Since the pipe end guide 63 extends for a long distance from near the drive unit 20 to near the fitting point 9p, the pipe end guide 63 is locked onto a long area in the circumferential direction of the pipe, including the top 9c of the pipe end 9e. This reliably prevents the pipe-making device 20 from falling due to its own weight near the top 9c.

[0059] 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 pipe-making apparatus 10 of the present invention may be applied to a strip-shaped member 10 in which the outer peripheral rib 12 protrudes from the raised portion 15. The upper part of the HD in the height direction of the pipe-making device may be tilted forward to expand the diameter of the rehabilitated pipe and attach it to the inner surface of the existing pipe. The brake mechanism of the pipe-making device may be omitted. [Industrial applicability]

[0060] This invention can be applied, for example, to the rehabilitation technology of aging sewer pipes. [Explanation of Symbols]

[0061] LD device longitudinal direction WD device width direction HD device height direction 1 Existing pipe 9 Rehabilitation pipe L9 tube shaft 9a Winding section 9c Top of tube 9d Raised side outer circumferential groove between turns (raised side outer circumferential groove) 9e Tube end 9p Fitting area 10 Strip-shaped member 10a,10b Edge 12 Outer ribs 12A Outer periphery rib immediately adjacent to the raised section 12B Outer Rib 12e protruding end 13a Fitting groove 14 Male mating part 15 Ridge 17 Inner raised lateral outer circumferential groove (raised lateral outer circumferential groove) 18. Inter-rib outer perimeter groove (outer perimeter groove) 19. Following section 19a Following section (the part pushed out from the drive unit) 20 Pipe making equipment 21 Main unit of the device 21b Bottom of device 30 Drive unit 31,32 Drive rollers 50 Inner Arm 54 Retaining member 60 Outer Arm 62 Following Zone Guide 63 Pipe end guide 64 Outer perimeter groove guide section 65 Pipe end guide claws 67 Cantilever claw section 67e Propulsion rear end (released end) 68 Cantilever support position

Claims

1. A pipe-making device for rehabilitating an existing pipe, which is positioned at the pipe end on the extension side in the pipe axis direction of the spiral-shaped rehabilitated pipe being manufactured, from a long strip-shaped member that is spirally wound along the inner circumference of the existing pipe, and which interlocks the opposing edges of the subsequent strip portion of the unmanufactured pipe connected to the pipe end of the strip-shaped member with the pipe end and propels it in the spiral winding direction, The apparatus comprises a main body positioned on the inner circumference of the pipe end so as to be movable in the spiral winding direction, with the longitudinal direction of the apparatus facing the spiral winding direction, A drive unit is provided on the main body of the device, having at least one pair of drive rollers whose axes are oriented in the device width direction perpendicular to the longitudinal direction of the device, and which obtains force for the concave and concave fitting and propulsion by clamping the trailing belt portion with the drive rollers and pushing it diagonally toward the rearward side of the device longitudinal direction and toward the outer circumference of the pipe, A pressing member is provided on the main body of the device and presses from the inner circumference side of the pipe at the fitting location or a location near thereon where the grooves and protrusions of the pipe end and the subsequent band portion are fitted together, A pipe end guide is provided at the bottom of the device body facing the outer circumference of the pipe in the height direction of the device which is perpendicular to the longitudinal direction and width direction of the device, and which receives the pipe end from the outer circumference. A pipe manufacturing device for rehabilitating existing pipes, comprising: a pipe end guide that extends from a cantilever support position on the forward side of the pressing member toward the rearward side of the thrust in an independent cantilever state, and includes a pair of cantilever claws that guide from both sides in the width direction of the device a raised portion for interlocking grooves that protrudes toward the outer circumference of the pipe at the edge of the pipe end.

2. The pipe-making apparatus according to claim 1, wherein the open end of the cantilever claw portion facing the rearward side of the propulsion is located near the pressing member in the longitudinal direction of the apparatus.

3. The pipe-making apparatus according to claim 1 or 2, wherein the height dimension of the cantilever claw portion along the height direction of the apparatus is less than or equal to the depth of the outer peripheral groove on the side of the raised portion.

4. The pipe-making apparatus according to claim 1 or 2, wherein the cantilevered claw portion is curved in an arc shape along the extension direction.

5. The pipe-making apparatus according to claim 1 or 2, wherein a trailing belt guide is provided extending forward in the width direction of the apparatus from the pipe end guide at the bottom of the apparatus, extending from near the drive unit toward the rearward direction of propulsion, and fitting into the inter-rib outer peripheral groove between adjacent outer peripheral ribs in the trailing belt portion pushed out from the drive unit.

Images