Pipe forming device

Abstract

To perform a preparation operation for getting over a cross-sectional displacement part such as a step or a projection on an inner peripheral surface of an existing pipe on an extension front side in time when the cross-sectional displacement part is present when a spiral tubular rehabilitation pipe is manufactured along the inner periphery of the existing pipe by a self-propelled pipe manufacturing device.SOLUTION: A pipe forming device 20 includes: a device body 21 disposed at the pipe end 9e on an extension front side in the axial direction of the rehabilitation pipe 9; a drive roller 22 that clamps the subsequent band portion 19 of the unrefined pipe in a strip-shaped member 10 and pushes it obliquely toward the pipe end 9e; a pipe end guide 23 that is engaged with the pipe end 9e so as to be slidable in the spiral winding direction; and an operating mechanism 30. The operating mechanism 30 has a detection member 32 that protrudes from the device body 21 toward the extension front side by several times or more the spiral winding pitch of the rehabilitation pipe 9, and detects the inner peripheral surface shape of the existing pipe 1 on the extension front side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A method for rehabilitating an existing pipe, such as an aging sewer pipe, by winding a strip-shaped member around the inner surface of the existing pipe to produce a helical rehabilitating pipe is known. For example, Patent Documents 1 and 2 describe a self-propelled pipe-making device for producing a rehabilitating pipe. The pipe-making device includes a device main body disposed at the pipe end on the extending forward side of the rehabilitating pipe, at least a pair of drive rollers provided on the device main body, and a plurality of pipe end guides slidably engaged along the pipe end. The device main body is not provided with an inner circumferential restricting member such as a link roller that restricts the pipe end from the inner circumferential side, and the pipe end other than where the device main body is located is open to the inner circumferential side.

[0003] The trailing band of the unprocessed pipe in the band-shaped member is clamped by the drive rollers and pushed diagonally toward the pipe end. As a result, the trailing band is incorporated into the pipe end, stretching the rehabilitated pipe, and the pushing reaction force propels the pipe making device in the spiral winding direction. The pipe diameter can be increased or decreased by tilting the width direction, which is perpendicular to the forward movement direction of the pipe making device, with respect to the pipe axis direction, or by applying a brake between the pipe end and the band-shaped member by a brake mechanism built into the pipe end guide (1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-084728 [Patent Document 2] Japanese Patent Publication No. 2023-071364 Summary of the Invention [Problem to be solved by the invention]

[0005] The inner surface of existing pipes, such as aging sewer pipes, may have cross-sectional deformations such as steps or protrusions. During rehabilitation work, in order to overcome such cross-sectional deformations, preparatory operations such as gradually reducing the pipe diameter from a certain point before the cross-sectional deformation are required. For example, it was necessary to change the settings for the brake force of the pipe manufacturing equipment several pitches before the spiral winding of the rehabilitated pipe.

[0006] However, at actual rehabilitation work sites, due to various adverse conditions such as sewage flowing while the pipe is in service or darkness, pipe making can continue without noticing the displaced cross-section, causing the pipe making device to get caught on the displaced cross-section and stop.In particular, in pipe making using attachment, in which the entire circumference of the rehabilitated pipe is attached to the inner surface of the existing pipe, the pipe making device can easily get caught on even small steps or protrusions on the inner surface of the existing pipe and stop. In consideration of the above circumstances, the present invention aims to ensure that when a spiral-shaped rehabilitation pipe is produced along the inner circumference of an existing pipe using a self-propelled pipe-producing device, if there is a cross-sectional displacement portion such as a step or protrusion on the inner surface of the existing pipe ahead of the extension, the presence of the cross-sectional displacement portion can be detected at least a distance before the distance required for the preparation operation to overcome it, so that the preparation operation to overcome it can be performed in time. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a pipe manufacturing device that manufactures a spiral-shaped rehabilitation pipe made of a strip-shaped member along the inner periphery of an existing pipe while propelling the pipe in a spiral winding direction, an apparatus main body provided at a pipe end portion on the front side of the pipe in the pipe axial direction of the rehabilitating pipe being manufactured so as to be movable in the spiral winding direction; a drive roller provided in the device body for sandwiching a subsequent band portion of the unfinished pipe following the pipe end portion of the band-shaped member and pushing it obliquely toward the pipe end portion; a tube end guide provided in the device body and engaged with the tube end so as to be slidable in the spiral winding direction; an operating mechanism that has a detection member that protrudes from the device body toward the extension front side by several times or more the spiral winding pitch of the rehabilitating pipe and comes into contact with the inner peripheral surface of the existing pipe, and that is operated in accordance with the shape of the inner peripheral surface of the existing pipe at the extension front side; The present invention is characterized by the following.

[0008] When producing pipe using this pipe-making device, if there is a cross-sectional deformation, such as a step or protrusion, on the inner circumferential surface of the existing pipe more than several pitches forward of the spiral winding of the rehabilitating pipe, a detection member comes into contact with the cross-sectional deformation, activating the operating mechanism. This operation allows the shape of the inner circumferential surface of the existing pipe at a position more than several pitches forward of the device body. Accordingly, advance preparation operations, such as reducing the diameter of the rehabilitating pipe, can be started at least several pitches before the cross-sectional deformation. The distance required in the pipe axis direction from the start of the preparation operation for climbing over the cross-section displacement portion until the rehabilitating pipe is ready to climb over the cross-section displacement portion is usually several pitches of the rehabilitating pipe. Therefore, by completing the preparation operation for climbing over before the main body of the pipe making device reaches the cross-sectional displacement section, pipe can be made while climbing over the cross-sectional displacement section.

[0009] Preferably, the distance along the tube axis from the position where the trailing band portion is fitted with the tube end to the tip of the detection member is three times or more the spiral winding pitch. This ensures that the preparation operation for climbing over the cross-sectional deformation portion on the extension front side can be completed in time.

[0010] Preferably, the operating mechanism includes a holder provided in the device body that holds the base end of the detection member so that it can be raised and lowered in the device height direction along the pipe diameter direction of the rehabilitation pipe, and a biasing means that biases the detection member toward the bottom side facing the outer periphery of the pipe in the device height direction. As a result, the detecting member is constantly pressed against the inner peripheral surface of the existing pipe by the biasing means, and is raised and lowered in accordance with the shape of the inner peripheral surface of the existing pipe, thereby ensuring that the operating mechanism is reliably operated in accordance with the shape of the inner peripheral surface of the existing pipe. The detecting member can be pressed against the inner surface of the existing pipe by the biasing means not only when the pipe making device is located at the bottom of the existing pipe but also when it is located at the top or side of the pipe, so that cross-sectional displacement portions at not only the bottom of the pipe but also the top or side of the pipe can be reliably detected.

[0011] Preferably, the operating mechanism further has a shaft extending from the base end of the detection member in the height direction of the device, and the shaft is held by the holder so that it can be raised and lowered so that it can appear and disappear on the top side facing the inner circumference of the pipe in the height direction of the device. When a convex cross-sectional deformation part is present in front of the extension, the detection member hits the cross-sectional deformation part and rises upward in the device height direction, causing the upper part of the shaft to protrude from the holder. By confirming this protrusion, the operator can begin the climb-over preparation operation.

[0012] Preferably, the shaft has a visible mark on its outer periphery. When a cross-sectional deformation portion is present ahead of the extension, the portion of the shaft with the visual mark protrudes from the holder. By visually checking the visual mark, the operator can start the climb-over preparation operation. Preferably, the visual mark is a colored mark.

[0013] The detection member includes a rotor that is rotatable about an axis along a protruding direction of the detection member. The rotor rolls in contact with the inner circumferential surface of the existing pipe, thereby reducing frictional resistance between the inner circumferential surface of the existing pipe and the detection member. [Effects of the Invention]

[0014] According to the present invention, if there is a cross-sectional displacement portion such as a step or protrusion on the inner surface of the existing pipe ahead of the extension, the presence of the cross-sectional displacement portion can be reliably detected at least the distance before the distance required for the preparation operation to overcome it, and by completing the preparation operation to overcome it before the main body of the device reaches the cross-sectional displacement portion, the pipe can be produced while reliably overcoming the cross-sectional displacement portion. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a side cross-sectional view illustrating the process of rehabilitating an existing pipe by producing a rehabilitating pipe from a strip-shaped member using a pipe producing apparatus according to one embodiment of the present invention. [Figure 2] FIG. 2 is a front cross-sectional view of the pipe manufacturing apparatus during the rehabilitation work of the existing pipe, taken along line II-II in FIG. [Figure 3] 3 is a side cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a front view taken along line IV-IV in FIG. 3, illustrating the operating mechanism of the pipe making apparatus. [Figure 5] FIG. 5 is a front cross-sectional view of the pipe manufacturing apparatus during the rehabilitation work of the existing pipe, in a state where the detection member of the operating mechanism has climbed onto a step in the cross-sectional displacement portion. [Figure 6] FIG. 6 is a side cross-sectional view illustrating the operating mechanism when the vehicle runs over the obstacle. [Figure 7] FIG. 7 is a side cross-sectional view showing the state in which the rehabilitating pipe is manufactured until it overcomes the cross-sectional deformation portion. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the present invention is applied to, for example, the rehabilitation of an existing aged pipe 1. The existing pipe 1 is rehabilitated by lining the inner periphery of the existing pipe 1 with a rehabilitation pipe 9. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried underground. The existing pipe 1 has a structure in which, for example, multiple pipe bodies 1a, 1a' are lined up in a row. In the existing aged pipe 1, a step-like cross-sectional displacement portion 1d may be formed between adjacent pipe bodies 1a, 1a'. The existing pipes to be rehabilitated are not limited to sewerage pipes, but may also include water supply pipes, agricultural water pipes, gas pipes, hydroelectric power generation water pipes, tunnels, etc.

[0017] 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 3, the strip-shaped member 10 is made of a synthetic resin such as polyvinyl chloride, and extends long in the strip length direction (the direction perpendicular to the plane of the paper in Figure 3). Concave, convex, or uneven fitting portions 13, 14 are formed on both edges of the strip-shaped member 10 in the strip width direction (the left-right direction in Figure 3). The cross-sectional shape of the belt-shaped member 10 can be modified as appropriate.

[0018] As shown in Figures 1 to 3, a strip-shaped member 10 is wound spirally around the inner circumference of an existing pipe 1, and mating portions 13, 14 of adjacent edges that are one turn apart are joined together by a concave-convex mating, thereby constructing a spiral tubular rehabilitation pipe 9.

[0019] As shown in Figures 1 and 2, the rehabilitating pipe 9 (helical pipe) is produced by a so-called self-propelled pipe making device 20. The pipe making device 20 is arranged at the pipe end 9e on the front side (right side in Figure 1) of the rehabilitating pipe 9 in the pipe axial direction (left and right direction in Figure 1). A subsequent band portion 19 of the unmade pipe in the band-shaped member 10 is unwound from a drum (not shown) on the ground, passes through the starting manhole 4 and the inside of the rehabilitating pipe 9 (the previously made pipe portion of the band-shaped member 10), and is introduced into the pipe making device 20 on the pipe end 9e. As shown in Figure 3, the pipe making device 20 fits the fitting portion 14 of the subsequent band portion 19 with the fitting portion 13 of the pipe end 9e at the fitting position 9p on the pipe end 9e.

[0020] As shown in Figure 2, the pipe making device 20 includes an apparatus main body 21, a drive unit 22, and a pipe end guide 23. The apparatus main body 21 is formed in a frame or housing shape, and is arranged on the inner side of the rehabilitating pipe end 9e so as to be movable in the spiral winding direction of the rehabilitating pipe 9. The dimension of the longitudinal direction LD of the apparatus main body 21 along the circumferential direction or spiral winding direction of the rehabilitating pipe 9 is approximately one-several to one-several tenths of the pipe circumference of the rehabilitating pipe 9. The apparatus main body 21 is not provided with an inner circumference regulating body such as a link roller that regulates the pipe end 9e from the inner circumference side, and the pipe end 9e other than where the apparatus main body 21 is arranged is open to the inner circumference side.

[0021] 2 and 3, a drive unit 22 is provided in the device body 21. The drive unit 22 includes at least one pair (here, two pairs) of drive rollers 24, 25 and a drive motor 22a. The axes of the drive rollers 24, 25 are oriented in the width direction WD, which is perpendicular to the longitudinal direction LD of the device body 21. The drive motor 22a is connected to the drive roller 24 via a torque transmission mechanism 22b, such as a gear, so as to be able to transmit torque.

[0022] One or more pipe end guides 23 are provided at the bottom (lower side in FIG. 3) in the height direction HD of the device body 21. The multiple pipe end guides 23 are arranged spaced apart from one another in the longitudinal direction LD of the device body 21. Each pipe end guide 23 is engaged with the pipe end 9e so as to be slidable in the spiral winding direction of the rehabilitating pipe 9. The device height direction HD is oriented along the pipe diameter direction or the inner / outer direction of the rehabilitating pipe 9.

[0023] At least one tube end guide 23 is equipped with a brake mechanism 26. The brake mechanism 26 includes a brake shoe 26a that can be pressed against the tube end 9e, and an adjustment mechanism 26b that adjusts the pressing force of the brake shoe 26a.

[0024] As shown in Figure 2, a guide roller 27 is provided on the side surface 21f of the device main body 21 facing forward in the stretching direction (the front side of the paper in Figure 2). The guide roller 27 is formed in a conical shape and protrudes from the device main body 21 toward the front side in the stretching direction (the front side of the paper in Figure 2). If there is a step or protrusion on the inner surface 1b of the existing pipe closest to the pipe making device 20, the guide roller 27 will ride over the step or protrusion, allowing the pipe making device 20 to climb over the step or protrusion while tilting.

[0025] As shown in Figures 1 to 3, the pipe making apparatus 20 is further provided with an operating mechanism 30. As shown in Figure 2, the operating mechanism 30 is disposed forward of the guide rollers 27 in the apparatus body 21 (to the right in Figure 2). As shown in Figures 3 and 4, the operating mechanism 30 includes a holder 31 and a detection member 32. The holder 31 is formed in a cylindrical shape with its axis oriented in the apparatus height direction HD and is fixed to the side surface 21f of the apparatus body 21 facing forward (to the right in Figure 3). As shown in Figure 4, a side plate 31a on the forward side of the holder 31 (the front side of the paper in Figure 4) has an elongated opening 31b extending in the apparatus height direction HD. As shown in Figure 3, an opening 31d is formed in a cover plate 31c at the top end (the upper end in Figure 4) of the holder 31.

[0026] As shown in FIG. 3, the detection member 32 includes a base piece 33 and a detection roller 34 (rotating body). The base piece 33 is housed inside the holder 31 and is held by the holder 31 so that it can be raised and lowered. The detection roller 34 is formed in a cylindrical shape and protrudes in a cantilevered manner from the holder 31 toward the extension front side (the right side in FIG. 3). The tip 34e of the detection roller 34 in the protruding direction has a rounded shape, such as a hemispherical shape. The detection roller 34 is rotatable around an axis (roller shaft 34c) along the protruding direction. The base end of the roller shaft 34c is connected to the base piece 33 through the opening 31b. The roller shaft 34c is oriented in the width direction WD of the pipe making apparatus 20 or the pipe axis direction of the rehabilitating pipe 9 (the left-right direction in FIG. 3). Strictly speaking, the device width direction WD is inclined by the lead angle of the spiral of the rehabilitating pipe 9 with respect to the pipe axis direction of the rehabilitating pipe 9 .

[0027] 3, the axial length L34 of the detection roller 34 is several times or more the spiral winding pitch P9 of the rehabilitating pipe 9. Consequently, the detection member 32 protrudes from the device body 21 toward the extension front side (the right side in FIG. 3) by several times or more (at least two times or more, preferably three times or more) the spiral winding pitch P9.

[0028] As shown in FIG. 3, the distance L30 along the device width direction WD (substantially the pipe axial direction, the left-right direction in FIG. 3) from the fitting position 9p between the pipe end portion 9e and the trailing band portion 19 to the tip of the detection member 32 is set to be equal to or greater than the distance required in the pipe axial direction from the start of the preparation operation to overcome the cross-section displacement portion 1d until the rehabilitating pipe 9 is ready to overcome it. Preferably, the distance L30 is equal to or greater than three times the spiral winding pitch P9, and more preferably, approximately three to ten times the spiral winding pitch P9. For example, L30 is approximately 4 × P9. If the protruding length L30 of the detection member 32 is too short, the timing of the start of the preparation operation to overcome the cross-section displacement portion 1d may be delayed, and the device main body 21 may reach the cross-section displacement portion 1d before the rehabilitating pipe 9 has a pipe diameter large enough to overcome it. On the other hand, if the protruding length L30 of the detection member 32 is too long, the timing of the start of the preparation operation to overcome it may be too early, and the detection member 32 may be too long and difficult to handle.

[0029] As shown in Figure 3, a shaft 35 is provided at the base end of the detection member 32. The shaft 35 is formed in a rod or shaft shape and extends in the device height direction HD (inside and outside the rehabilitating pipe 9) perpendicular to the detection roller 34. The shaft 35 is housed in the holder 31 so as to be able to move up and down. The bottom end of the shaft 35 facing the outer periphery of the pipe (the lower end in Figure 4) is joined to the base end piece 33. The top end of the shaft 35 facing the inner periphery of the pipe (the upper end in Figure 3) can be inserted into and removed from the top opening 31d of the holder 31.

[0030] An identification mark 36 is provided on the outer periphery of the shaft 35. Preferably, the identification mark 36 is a colored mark that has a hue different from that of the holder 31 and the device main body 21 around the shaft 35 or a color that is highly distinguishable. The identification mark 36 may be a colored paint applied to the shaft 35, or a colored adhesive tape attached to the shaft 35.

[0031] Preferably, the visual identification marks 36 are color-coded according to their positions in the longitudinal direction of the shaft 35. More preferably, the color of the visual identification mark 36a on the top side (above in FIG. 4) of a position 35p that is a predetermined distance D36 away from the top end of the shaft 35 toward the bottom side (downward in FIG. 4) is different from the color of the visual identification marks 36b, 36c on the bottom side (below in FIG. 4) of position 35p. Even more preferably, the visual identification marks 36b, 36c on the bottom side are a color (e.g., red) that stands out more than the visual identification mark 36a on the top side.

[0032] The predetermined distance D36 is set to match the minimum height of the cross-sectional displacement section 1d that requires prior preparation for climbing over, and is, for example, D36 = 10 mm. If the cross-sectional displacement section 1d is less than 10 mm in height, the pipe making device 20 can climb over it without any prior preparation for climbing over.

[0033] The visual mark 36a on the top side may be omitted. In Figure 3, the visual identification marks 36 are color-coded into three colored marks 36a to 36c, but this is not limited to this and they may be color-coded into two or four or more colors, and the color may change continuously depending on the position in the axial direction of the shaft 35.

[0034] As shown in Fig. 3, a compression coil spring 37 (biasing means) is housed in the holder 31. A shaft 35 passes through the compression coil spring 37. The top end of the spring 37 (the upper end in Fig. 4) abuts against the cover plate 31c. The bottom end of the spring 37 (the lower end in Fig. 4) abuts against the base end piece 33. The spring 37 biases the detection member 32 toward the bottom side (the outer periphery of the pipe) in the device height direction HD.

[0035] In the pipe making device 20, a pair of drive rollers 24, 25 clamp the trailing band portion 19 and are driven to rotate by a drive motor 22a. This causes the trailing band portion 19 to be pushed obliquely toward the pipe end 9e, and the opposing fitting portions 13, 14 of the pipe end 9e and the trailing band portion 19 are fitted together at a fitting position 9p on the pipe end 9e. In this way, the pipe making process progresses. In addition, the reaction force from the pushing propels (self-propels) the pipe making device 20 in a counterclockwise spiral winding direction in Figure 2 along the inner circumference of the existing pipe 1.

[0036] Preferably, the brake shoe 26a of the brake mechanism 26 is pressed against the pipe end 9e to generate a braking force. This causes the speed at which the trailing band 19 is fed to the pipe end 9e by the drive rollers 24, 25 to be greater than the forward speed of the pipe making device 20. As a result, the rehabilitating pipe 9 is expanded in diameter and made so that it is attached to the entire inner surface 1b of the existing pipe 1.

[0037] The detection roller 34 of the operating mechanism 30 is pressed against the inner surface 1b of the existing pipe 1 by the spring force of the compression coil spring 37, and is therefore in constant contact with the inner surface 1b. Even when the pipe making device 20 is located at the top or side of the existing pipe 1, the spring 37 can reliably press the detection roller 34 against the inner surface 1b. As the pipe making device 20 is advanced in the spiral winding direction, the detection roller 34 rolls on the inner surface 1b of the existing pipe 1. The detection roller 34 is also raised and lowered in the device height direction HD to match the shape of the inner surface 1b of the existing pipe ahead of the device main body 21 in the extension direction. Consequently, the operating mechanism 30 is operated to match the shape of the inner surface 1b of the existing pipe ahead of the extension direction. The detection roller 34 has a length equivalent to several pitches of the spiral winding pitch P9 of the rehabilitating pipe 9, and is therefore raised and lowered (operated) in accordance with the shape of the inner surface of the existing pipe 1 at a position several pitches ahead of the device main body 21 in the extension direction.

[0038] 5 and 6, when a cross-sectional deformation portion 1d such as a step or a protrusion is present on the inner peripheral surface 1b of the existing pipe at a position several pitches forward of the device body 21, the detection roller 34 rides up on the cross-sectional deformation portion 1d. This causes the detection member 32 to be pushed up against the spring force of the compression coil spring 37, and the top end of the shaft 35 to jump out of the holder 31.

[0039] The detection roller 34 is pressed against the inner surface 1b by the spring 37, so that the cross-sectional displacement portion 1d can be reliably detected regardless of the position of the pipe making device 20 in the circumferential direction of the existing pipe 1. The cross-sectional displacement portion 1d at the pipe top and pipe side can also be reliably detected. An upward step-like cross-sectional displacement toward the front of the extension can be detected at the pipe bottom. A downward step-like cross-sectional displacement toward the front of the extension can be detected at the pipe top. Furthermore, since the tip 34e of the detection roller 34 has a rounded shape, the detection roller 34 can be prevented from getting caught on a step on the inner peripheral surface 1b of the existing pipe, causing the pipe making device 20 to stop.

[0040] The worker can determine the presence or absence of the cross-sectional displacement portion 1d or the height of the cross-sectional displacement portion 1d from the presence or absence or amount of protrusion of the shaft 35. At this time, the worker can easily determine the height of the cross-sectional displacement portion 1d by checking the color of the visual identification mark 36 on the portion of the shaft 35 that protrudes from the holder 31. The higher the cross-sectional displacement portion 1d, the greater the amount of protrusion of the shaft 35, and the more bottom-side visual identification marks 36b, 36c become visible. This makes it easy to determine the height of the cross-sectional displacement portion 1d from the color of the visual identification mark 36.

[0041] When the shaft 35 protrudes from the holder 31 by a predetermined distance D36 (for example, 10 mm) or more, the visual identification marks 36b and 36c appear outside the holder 31 and become visible. This allows the worker to know that a cross-sectional displacement portion 1d of a predetermined height (for example, 10 mm) or more is located several pitches forward of the device main body 21. Even if the rehabilitation construction site is in service and sewage is flowing or it is a dark place, the presence of the cross-sectional displacement portion 1d can be reliably confirmed by visually identifying the visual identification marks 36.

[0042] In response to this, the worker performs a preliminary operation to prepare for climbing over the cross-section displacement portion 1d. In other words, the operator can start the operation to prepare for climbing over the cross-section displacement portion 1d several pitches before the cross-section displacement portion 1d. The operation to prepare for climbing over is, for example, performed by changing the settings of the brake mechanism 26. Specifically, the pressing force (braking force) of the brake shoe 26a against the pipe end 9e is weakened. This allows the rehabilitated pipe 9 to be manufactured so that its diameter is gradually reduced.

[0043] 7, the diameter of the rehabilitating pipe 9 is reduced by an amount equivalent to the height of the cross-section displacement section 1d over several pitches from the start point of the cross-section displacement operation. This allows the cross-section displacement operation to be completed before the device body 21 of the pipe making device 20 arrives at the cross-section displacement section 1d, and the pipe can be made to climb over the cross-section displacement section 1d. After passing through the cross-section displacement portion 1d, the brake mechanism 26 is returned to its original setting, and the rehabilitating pipe 9 is produced so as to be attached to the inner peripheral surface 1b of the existing pipe 1. The operating mechanism 30 does not include an electrical sensor or an electrical circuit, and therefore can be reliably operated even in adverse environments such as when the device is in service.

[0044] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the rotating body of the actuation mechanism 30 is not limited to a cylindrical shape but may be a disk shape. The detection member 32 may be a rod-shaped body. The biasing means of the operating mechanism 30 is not limited to a compression coil spring, but may be a tension coil spring, elastic rubber, or the like. The visual recognition mark 36 is not limited to a colored mark, but may be a pattern, a symbol, or a scale. As a preparation operation for climbing over, the width direction WD of the pipe producing apparatus 10 may be tilted with respect to the pipe axis direction of the rehabilitating pipe 9 to produce a pipe with a reduced diameter. The cross-sectional displacement portion 1d is not limited to a stepped shape, but may be tapered or protruding. The operating mechanism 30 can also be operated by a tapered or protruding cross-sectional displacement portion. The pipe making device may have an inner circumference regulating body such as a link roller. [Industrial Applicability]

[0045] The present invention can be applied to, for example, a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0046] 1 Existing pipes 1b Inner surface 1d Cross-sectional displacement section 9 Rehabilitation pipe (spiral pipe) 9e Tube end 9p Mating position (mating position) 10. Belt-shaped member 19 Trailing belt 20 Pipe making equipment 21 Device body 21f Extended forward facing side 22 Drive unit 23 Pipe end guide 24,25 Drive roller 26 Brake mechanism 27 Guide roller 30 Operating mechanism 31 Holder 32 Detection member 34 Detection roller (rotating body) 35 shaft 36 Visibility Mark 37 Compression coil spring (biasing means) P9 Spiral Winding Pitch LD Longitudinal direction HD Device height direction WD device width direction L30 Distance from the mating position to the tip of the detection member

Claims

1. In a pipe manufacturing device, a spiral-shaped rehabilitation pipe made of a strip-shaped member is manufactured along the inner periphery of an existing pipe while being propelled in a spiral winding direction. an apparatus main body provided at a pipe end portion on the front side of the pipe in the pipe axial direction of the rehabilitating pipe being manufactured so as to be movable in the spiral winding direction; a drive roller provided in the device body for sandwiching a subsequent band portion of the unfinished pipe following the pipe end portion of the band-shaped member and pushing it obliquely toward the pipe end portion; a tube end guide provided in the device body and engaged with the tube end so as to be slidable in the spiral winding direction; an operating mechanism that has a detection member that protrudes from the device body toward the extension front side by several times or more the spiral winding pitch of the rehabilitating pipe and comes into contact with the inner peripheral surface of the existing pipe, and that is operated in accordance with the shape of the inner peripheral surface of the existing pipe at the extension front side; A pipe making apparatus comprising:

2. A pipe making apparatus as described in claim 1, wherein the distance along the pipe axis direction from the position where the subsequent band portion is engaged with the pipe end portion to the tip of the detection member is at least three times the spiral winding pitch.

3. The pipe making apparatus of claim 1, wherein the operating mechanism includes a holder provided in the apparatus main body that holds the base end of the detection member so that it can be raised and lowered in the apparatus height direction along the pipe diameter direction of the rehabilitation pipe, and a biasing means that biases the detection member toward the bottom side facing the outer periphery of the pipe in the apparatus height direction.

4. A pipe making apparatus as described in claim 3, wherein the operating mechanism further has a shaft extending from the base end of the detection member in the height direction of the apparatus, and the shaft is held by the holder so that it can be raised and lowered so as to appear and disappear on the top side facing the inner circumference of the pipe in the height direction of the apparatus.

5. 5. A pipe manufacturing apparatus according to claim 4, wherein a visual mark is provided on the outer periphery of the shaft.

6. A pipe making apparatus according to any one of claims 1 to 5, wherein the detection member includes a rotor that can rotate around an axis along the protruding direction of the detection member.

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