Tube making device

Abstract

To prevent poor fitting and mechanical trouble caused by a collapse and deformation of fitting convex strips of a belt-like member when a spiral tube is made from the belt-like member by a tube making device.SOLUTION: A belt guide part 30 of a tube making device 20 guides an unformed tube belt part 19 of a belt-like member 10 to a tube making part 21, which then makes a spiral tube 3 from the belt-like member 10 by the tube making part 21. The tube making part 21 is provided with a convex strip guide 40 that guides a fitting convex strip 14b of the belt-like member 10 from a side before the concave and convex parts are engaged. Preferably, the convex strip guide 40 has a guide protrusion 52 that protrudes upstream in a feed direction of the unmade tube belt part 19 along a straight guide path 39 of the belt guide part 30.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a pipe making apparatus for making a spiral pipe from a strip-shaped member, and more particularly to a pipe making apparatus suitable for a strip-shaped member having a mating protrusion. [Background technology]

[0002] For example, Patent Document 1 discloses a pipe making device for producing a spiral pipe from a long, resinous strip-shaped member. One edge of the strip-shaped member in the strip width direction has a mating groove formed thereon, and the other edge has a mating ridge formed thereon. The mating groove and mating ridge, which are opposite each other on different circumferences of the spirally wound strip-shaped member, are mated with each other by the pipe making device. The spiral pipes thus produced are sequentially extruded from the pipe making device in the axial direction.

[0003] Patent Document 2 discloses a so-called expansion pipe manufacturing method. In the expansion pipe manufacturing method, a helical pipe manufactured to a diameter smaller than the inner diameter of the pipeline is pushed out from a pipe manufacturing device and placed in the pipeline. Then, the binding force between the fitting grooves and the fitting ridges of the helical pipe is weakened while the pipe manufacturing process is continued, thereby expanding the circumferential length of the helical pipe (expanding the diameter). This causes the helical pipe to adhere to the inner surface of the pipeline.

[0004] The pipeline may be, for example, an existing pipe such as an aged sewer pipe. The existing pipe is rehabilitated by lining the inner periphery of the existing pipe with a rehabilitation pipe made of a spiral pipe. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 55-061434 [Patent Document 2] Special Publication No. 02-061434 Summary of the Invention [Problem to be solved by the invention]

[0006] According to the inventor's findings, in this type of pipe-making device, the mating ridges of the strip-shaped member tend to collapse before mating with the mating grooves. Because the strip-shaped member is usually wound around a drum before pipe-making, cross-sectional forces due to bending act in a direction that tends to collapse the mating ridges. Furthermore, compression due to winding also acts as a force that tends to collapse the mating ridges.

[0007] If pipe production is attempted with the fitting ridges in a fallen state, poor fitting will occur, causing the pipe production machine to stop, and recovery will take time and effort. For this reason, it was necessary to monitor the fitting ridges to make sure they did not fall during operation. If a fall was found, the pipe production machine had to be stopped and the fallen part of the fitting ridge had to be straightened with a tool. In view of the above circumstances, the present invention aims to prevent poor fitting and mechanical troubles caused by the collapse and deformation of the fitting protrusions of the strip-shaped member when producing a spiral pipe from a strip-shaped member using a pipe producing device. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides a pipe making device for making a spiral pipe made of a spirally wound belt-shaped member by fitting together fitting recesses and fitting protrusions formed on adjacent edges of the belt-shaped member at different circumferences, the pipe making device comprising: a pipe making section that overlaps the edge of the unmade pipe band portion of the band-shaped member with the edge of the pipe end portion that is continuous with the unmade pipe band portion in the previously made pipe portion of the spiral pipe, and fits the fitting recesses and fitting protrusions of these edges together; a band guide section for guiding the unprocessed pipe band portion to the pipe processing section; a convex strip guide provided in the band guide section or the pipe making section, which guides the fitting convex strip from the side before the concave-convex fitting; The present invention is characterized by the following.

[0009] According to this pipe making device, by raising the fallen fitting ridges along the ridge guide, it is possible to correct the falling deformation and prevent the fitting ridges from falling. Therefore, it is possible to prevent fitting failures caused by the falling fitting ridges, avoid machine troubles due to fitting failures, and eliminate the need for recovery work. As a result, it is possible to improve work efficiency and production efficiency.

[0010] Preferably, the band guide section has a guide main body section including a linear guide path, and a linear guide mechanism provided on the guide main body section for guiding the unprocessed pipe band section straight along the linear guide path, and the ridge guide has an attachment frame attached to the guide main body section, and a guide section supported by the attachment frame so as to be positioned to the side of the passage of the engaging ridge in the linear guide path. This allows the fitting ridges of the straightened portion of the unmanufactured pipe band of the belt-shaped member to be guided from the side by the ridge guide. When the belt-shaped member is straight, the cross-sectional force that tends to cause the fitting ridges to collapse and deform is small, so the load that the ridge guide receives when correcting and regulating the collapse of the fitting ridges can be reduced.

[0011] Preferably, the guide portion has a guide projection that projects along the linear guide path toward the upstream side in the feeding direction of the unmade pipe band portion. This allows the guide protrusions to be aligned with the mating ridges of the unmade pipe band portion that has been stretched linearly, thereby correcting any collapsed deformation of the mating ridges while the unmade pipe band portion is fed the length of the guide protrusions, and restricting the collapsed deformation of the mating ridges over an area corresponding to the length of the guide protrusions.

[0012] Preferably, the guide projection has a slope that is oblique to the extending direction of the linear guide path and is tapered toward the upstream side. This allows the fallen fitting ridges to be gradually raised along the inclined surfaces of the guide projections as the unmade pipe band portion is fed along the linear guide path, thereby reducing the load applied to the ridge guides.

[0013] Preferably, the mounting frame is mounted to the guide body portion so that its position can be adjusted in the width direction of the linear guideway. This allows the guide portion to be reliably positioned on the side of the fitting ridge of the strip-shaped member on the linear guide path, and allows the ridge guide to reliably correct or restrict any tilting deformation of the fitting ridge.

[0014] Preferably, the mounting frame is provided with a slide engagement portion that engages with the guide main body portion so as to be slidable in the width direction of the linear guide path, and a fixing means that fixes the slide engagement portion in a releasable manner at any position within the slidable range in the width direction. This allows the guide portion to be reliably positioned and fixed in position at the side of the fitting ridge of the strip-shaped member on the linear guide path.

[0015] Preferably, the mounting frame is provided with an adjustment means for adjusting the position of the slide engagement portion in the width direction. This allows the position of the guide portion to be adjusted so that it is reliably positioned on the side of the fitting ridge of the strip-shaped member on the linear guide path.

[0016] Preferably, the mounting frame is detachably attached to the guide body portion. This allows the ridge guide to be replaced depending on the cross-sectional shape or dimensions of the strip-shaped member, or the ridge guide to be retrofitted to an existing pipe-making device. [Effects of the Invention]

[0017] According to the present invention, when a spiral pipe is produced from a strip-shaped member using a pipe-making device, the collapsed deformation of the mating convex strips of the strip-shaped member can be corrected or regulated, thereby preventing poor fitting and mechanical troubles caused by the collapsed deformation of the mating convex strips. [Brief explanation of the drawings]

[0018] [Figure 1]FIG. 1 is a side cross-sectional view showing a pipeline rehabilitation work in which a rehabilitation pipe (helical pipe) is produced from a strip-shaped member by a pipe producing device according to one embodiment of the present invention to rehabilitate an existing pipeline. [Figure 2] Fig. 2(a) is a cross-sectional view of the belt-shaped member taken along line IIa-IIa in Fig. 1. Fig. 2(b) is a cross-sectional view of the rehabilitating pipe at the circular portion IIb in Fig. 1. [Figure 3] FIG. 3 is a front view of the pipe making apparatus taken along line III-III in FIG. [Figure 4] FIG. 4 is a front cross-sectional view of the band guide portion of the pipe producing apparatus. [Figure 5] 5 is a plan cross-sectional view of the band guide section taken along line VV in FIG. [Figure 6] FIG. 6 is a perspective view of a portion of the ridge guide and the belt-shaped member provided in the belt guide portion. [Figure 7] FIG. 7 is a plan sectional view showing how the tilt deformation of the fitting ridge of the belt-shaped member is corrected or restricted. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows the process of rehabilitating an existing, deteriorated pipeline 1. The existing pipeline 1 to be rehabilitated is, for example, a sewerage pipe buried underground, but the present invention is not limited to this and may also be a water supply pipe, an agricultural water pipe, a gas pipe, a hydroelectric power generation water pipe, a tunnel, etc. The pipeline 1 is rehabilitated by lining the inner periphery of the pipeline 1 with a rehabilitation pipe 3.

[0020] As shown in Fig. 1, the rehabilitation pipe 3 is a spiral pipe made of a strip-shaped member 10. The material of the strip-shaped member 10 is made of a synthetic resin such as polyvinyl chloride (PVC). As shown in Fig. 2(a), the strip-shaped member 10 is formed in the shape of a long strip having a constant cross-sectional shape.

[0021] Male and female mating portions 13, 14 are formed on the edge portions 11, 12 on both sides in the width direction of the belt-shaped member 10. The female mating portion 13 on one edge portion 11 includes two (multiple) mating grooves 13a, 13b that open to the inner circumferential side (the lower side in Figure 2(a)). The male mating portion 14 on the other edge portion 12 includes two (multiple) mating ridges 14a, 14b that protrude to the outer circumferential side (the upper side in Figure 2(a)). An inter-ridge groove 14c is formed between the mating ridges 14a, 14b. A plurality of ribs 15, for example, having a rectangular cross section, are formed in the middle portion in the width direction of the belt-shaped member 10 so as to protrude to the outer circumferential side. An outer circumferential groove 16 is formed between adjacent ribs 15. The cross-sectional shape of the belt-shaped member 10 can be modified as appropriate. For example, the rib 15 may have a T-shaped cross section.

[0022] 2(b), in the rehabilitation pipe 3, the strip-shaped member 10 is wound spirally, and the male and female mating portions 13, 14 of the edge portions 11, 12 that are offset from each other by one revolution are mated with each other. More specifically, the mating ridge 14a is mated with the mating groove 13a, and the mating ridge 14b is mated with the mating groove 13b.

[0023] As shown in Figure 1, the strip-shaped member 10 is wound around a drum 5 on the ground to form a ring-shaped wound stack 18. The strip-shaped member 10 (unmade pipe strip portion 19) is successively unwound from the wound stack 18, hung down into the starting manhole 4, and introduced into a push-type pipe making device 20 at the bottom of the starting manhole 4. The pipe making device 20 spirally winds the strip-shaped member 10 to make a spiral tubular rehabilitating pipe 3, and the made rehabilitating pipe 3 is successively pushed out of the pipe making device 20 into the existing pipeline 1.

[0024] As shown by the solid line in Figure 1, the rehabilitating pipe 3 is manufactured to have a smaller diameter than the existing pipeline 1. Thereafter, the mating ridge 14b is cut by the take-up wire 6 (Figure 2(b)), weakening the binding force between the male and female mating portions 13, 14, and the circumferential length of the rehabilitating pipe 3 is expanded (diameter enlarged) by further pipe manufacturing (expansion pipe manufacturing) by the pipe manufacturing device 20. As a result, the rehabilitating pipe 3 is attached to the existing pipeline 1 over its entire circumference, as shown by the two-dot chain line in Figure 1.

[0025] As shown in Figure 3, the pipe making device 20 includes a pipe making section 21 and a band guide section 30. The pipe making section 21 includes an outer periphery regulating body 22 and pinch rollers 23, 24. The outer periphery regulating body 22 is formed in a spirally twisted ring shape and surrounds the pipe end 3e of the previously produced portion 3a of the rehabilitating pipe 3, thereby regulating the outer periphery of the pipe end 3e. The unprocessed pipe band portion 19 of the band-shaped member 10 is continuous with the pipe end portion 3e.

[0026] A diameter adjustment mechanism 25 is provided at the upper end of the outer periphery restriction body 22. Pinch rollers 23, 24 are provided on the sides of the outer periphery regulating body 22. The pinch rollers 23, 24 engage the male and female mating portions 13, 14, which are one turn apart, of the spirally wound belt-shaped member 10. Specifically, as shown in Figure 2(a), the pinch rollers 23, 24 overlap and pinch the edge 11 (solid line in Figure 2(a)) of the unprocessed pipe belt portion 19 of the belt-shaped member 10 and the edge 12 of the pipe end 3e (chain double-dashed line in Figure 2(a)). As a result, the female mating portion 13 of the unprocessed pipe belt portion 19 and the male mating portion 14 of the pipe end 3e engage with each other, and the unprocessed pipe belt portion 19 becomes the new pipe end 3e and is incorporated into the preceding pipe processing portion 3a, thereby progressing pipe processing.

[0027] As shown in FIG. 3, the unprocessed pipe band portion 19 of the strip-shaped member 10 is guided to the pipe producing section 21 by a band guide section 30. The band guide section 30 includes a guide main body 31 and a linear guide mechanism 32. As shown in FIGS. 4 and 5, the guide main body 31 includes two half housings 33, 34, each of which has a U-shaped cross section in a plan view. The outer half housing 33 stands upright above the area where the pinch rollers 23, 24 of the pipe producing section 21 are located. The inner half housing 34 is provided on the inner side of the upper portion of the outer half housing 33. The half housings 34, 33 face each other in the inner / outer direction y along the radial direction of the pipe producing section 21 and are connected by a connecting means (not shown). A band inlet 38 is formed between the upper ends of the half housings 33, 34. The unprocessed pipe band portion 19 is introduced into the guide main body 31 through the band inlet 38.

[0028] 4, a linear guide mechanism 32 is provided inside the guide main body 31. The linear guide mechanism 32 includes multiple upper and lower stages of outer guide rollers 35 in an outer half-casing 33 and multiple upper and lower stages of inner guide rollers 36 in an inner half-casing 34. The outer guide rollers 35 are formed with an annular flange 37 that fits into the outer peripheral groove 16.

[0029] A linear guide path 39 extending straight in the vertical direction z is defined between the outer guide roller 35 and the inner guide roller 36 within the guide body portion 31. The rotation axis of each guide roller 35, 36 is directed in the width direction x of the linear guide path 39. As shown in Figures 4 and 5, the width direction x of the linear guide path 39 is directed in the front-to-rear direction parallel to the axial direction of the spiral-annular outer circumferential regulating body 22 of the pipe making portion 21 and thus the pipe axial direction of the rehabilitating pipe 3, and is perpendicular to the inward-outward direction y.

[0030] The linear guide path 39 serves as a path for the unwoven pipe band portion 19 of the band-shaped member 10. The length direction of the unwoven pipe band portion 19 on the linear guide path 39 is oriented in the extension direction z of the linear guide path 39. The width direction of the unwoven pipe band portion 19 is oriented in the width direction x of the linear guide path 39. The outer guide roller 35 of the linear guide mechanism 32 is rotated in contact with the outer peripheral surface of the unwoven pipe band portion 19, and the inner guide roller 36 is rotated in contact with the inner peripheral surface of the unwoven pipe band portion 19. As a result, the unwoven pipe band portion 19 is guided straight along the linear guide path 39 toward the pipe making section 21 below.

[0031] 4, the band guide section 30 is provided with a ridge guide 40. The ridge guide 40 is disposed between the upper and lower outer guide rollers 35 inside the outer half housing 33.

[0032] As shown in Figures 4 to 6, the ridge guide 40 has a mounting frame 41 and a guide portion 50. The mounting frame 41 includes, for example, two horizontal blocks 42, one above the other, an outer address plate 43, an inner address plate 44, and a position adjustment plate 45. The outer address plate 43 is hung across the outer ends of the two horizontal blocks 42, and the inner address plate 44 is hung across the inner ends of the two horizontal blocks 42. As a result, the mounting frame 41 is formed in a box shape with both widthwise open ends.

[0033] As shown in Figures 4 and 5, the outer ends of the upper and lower horizontal blocks 42 abut against the inner wall of the outer half-casing 33. An outer end protrusion 42b is formed on the outer end of each horizontal block 42. The outer protrusions 42b of the upper and lower horizontal blocks 42 are inserted into two adjacent holes 33c on the upper and lower sides of the outer half-casing 33, respectively, and face the outer surface of the outer half-casing 33. An outer contact plate 43 is attached to the outer surface of the outer half-casing 33. The outer contact plate 43 and the outer protrusions 42b of each horizontal block 42 are connected by set screws 61. This allows the mounting frame 41 to be detachably attached to the guide main body 31.

[0034] When the set screws 61 are loosened, the mounting frame 41 is released from the guide body 31 and becomes slidable in the width direction x. When the set screws 61 are tightened, the mounting frame 41 is fixed at any position within the slidable range in the width direction x. The pair of horizontal blocks 42 and the outer backing plate 43 form a slide engagement portion 46 that is slidably engaged with the guide body portion 31. The setscrew 61 constitutes a fixing means for releasably fixing the slide engagement portion 46 at any position within the slidable range.

[0035] 5 and 6, a position adjustment plate 45 is fixed to the outer surface of the outer address plate 43 by a fixing screw 62. The position adjustment plate 45 is formed in an L-shaped plate shape so as to extend from the outer address plate 43 to one side in the width direction x and wrap around the side surface 33b of the outer half-casing 33 in the width direction x. An adjustment screw 63 is provided on a plate portion 45b of the position adjustment plate 45 that faces the side surface 33b. The leg portion of the adjustment screw 63 abuts against the side surface 33b. By adjusting the amount of screwing of the adjustment screw 63, the position adjustment plate 45 slides in the width direction x, and further the position of the slide engagement portion 46 in the width direction x is adjusted. The position adjustment plate 45 and the adjustment screw 63 constitute an adjustment means 47 for adjusting the position of the slide engagement portion in the width direction x.

[0036] 5 and 6, the inner address plate 44 of the mounting frame 41 is fixed to the inner end of the horizontal block 42 with screws 64, and extends from the horizontal block 42 to one side in the width direction x. A guide portion 50 is provided on an end 44a of the inner address plate 44 on the extending side.

[0037] The guide portion 50 includes a vertical guide plate 51 and a guide protrusion 52. The guide plate 51 is detachably fixed to the inner backing plate 44 with screws 65. This allows the guide portion 50 to be supported by the mounting frame 41. The guide plate 51 protrudes from the inner backing plate 44 and hence the mounting frame 41 toward the linear guide path 39. The tip of the guide plate 51 faces the linear guide path 39.

[0038] As shown in Figures 4 and 6, a guide protrusion 52 is integrally formed at the tip of the guide plate 51. The guide protrusion 52 protrudes upward from the guide plate 51 along the extension direction z of the linear guide path 39, i.e., toward the upstream side in the feed direction z of the unprocessed pipe band portion 19, in a tapered shape. The length of the guide protrusion 52 along the feed direction z is long enough to correct or restrict the later-described collapse deformation of the male fitting portion 14. One side surface 52a of the guide protrusion 52 in the width direction x is inclined upward toward the other side in the width direction x. The side surface 52b of the guide protrusion 52 facing the mounting frame 41 is inclined upward toward the opposite side from the mounting frame 41. The guide protrusion 52 may have two surfaces in the width direction x that are inclined upwards and approach each other.

[0039] 5 and 6, the guide projections 52 are disposed on the sides of the paths of the mating ridges 14a, 14b of the unformed pipe band portion 19 on the linear guide path 39. Specifically, the guide projections 52 are inserted into the inter-ridge grooves 14c of the unformed pipe band portion 19, thereby being disposed close to the sides of the mating ridges 14a, 14b on both sides, and extending upward along the inter-ridge grooves 14c. In this way, the ridge guides 40 guide the male mating portion 14 from the sides. By adjusting the position of the mounting frame 41 in the width direction x, the guide protrusions 52 can be reliably positioned in the inter-protrusion grooves 14c. Alternatively, by replacing the guide portion 50 with one of the appropriate size depending on the cross-sectional shape and dimensions of the strip-shaped member, the guide protrusion 52 can be reliably positioned to the side of the male fitting portion 14. Also, the ridge guide 40 can be retrofitted to an existing pipe making device.

[0040] Here, cross-sectional force due to bending is generated in the strip-shaped member 10 in the wound body 18 (Fig. 1). This cross-sectional force acts in a direction that tilts the male fitting portion 14. In addition, a force that tries to tilt the male fitting portion 14 is also acting due to compression caused by winding. For this reason, the fitting ridges 14b, particularly on the edge side of the male fitting portion 14, are likely to tilt toward the fitting ridges 14a and become deformed. Therefore, when the strip-shaped member 10 (unmade pipe strip portion 19) is introduced into the strip guide section 30, the fitting ridges 14b may tilt toward the fitting ridges 14a.

[0041] As shown in Figure 7, when the engaging protrusion 14b is in a fallen state and the unprocessed pipe band portion 19 descends along the linear guide path 39, the engaging protrusion 14b eventually comes into contact with the inclined surface 52a or 52b of the guide protrusion 52 of the protrusion guide 40. Furthermore, as the unmade pipe band portion 19 descends, the engaging ridges 14b slide along the inclined surfaces 52a, 52b and are pushed in the width direction x. This corrects the collapsed deformation. The engaging ridges 14b can be gradually raised along the inclined surfaces 52a, 52b, and the load on the ridge guide 40 can be sufficiently reduced.

[0042] Alternatively, when the fitting ridge 14b is about to collapse within the band guide portion 30, the guide projection 52 comes into contact with the fitting ridge 14b, thereby preventing the fitting ridge 14b from collapsing and deforming. By arranging the ridge guide 40 in the linear guide path 39, it is possible to guide the fitting ridge 14b of the belt-shaped member 10 when the belt-shaped member 10 is extended straight. Therefore, it is possible to reduce the load required to correct and restrict the tilting deformation of the fitting ridge 14b. Incidentally, when correcting or restricting the tilting deformation of the engaging protrusion 14b when the strip-shaped member 10 has a curvature, it is necessary to resist the cross-sectional force that tends to cause the tilting deformation, which increases the load applied to the protrusion guide 40.

[0043] In this way, by guiding the male fitting portion 14 with the ridge guide 40, it is possible to prevent fitting failures in the pipe making section 21. Therefore, machine troubles and operation stoppages due to fitting failures can be avoided, and recovery work can be made unnecessary. As a result, work efficiency and production efficiency can be improved. Furthermore, the burden on the operator to monitor whether the male fitting portion 14 falls over during operation can be reduced.

[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, a convex strip guide may be provided between the fitting convex strip 14a and the rib 15, and the convex strip guide may correct or restrict the tilting deformation of the fitting convex strip 14a. A ridge guide 40 may be provided in the pipe making section 21. A guide section 50 may be arranged close to the side of the fitting ridge 14b before the concave-convex fitting at the rehabilitating pipe end 3e, so as to correct or restrict the tilting deformation of the fitting ridge 14b before the concave-convex fitting at the pipe end 3e. The pipe making device is not limited to the push-type pipe making machine 20, but may also be a self-propelled pipe making machine that is arranged at the end of the pipe at the tip side in the extension direction of the spiral pipe 3 and makes the pipe while moving on its own. [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 pipelines 3 Rehabilitation pipe 3a Parts that have been manufactured in advance 3e Tube end 10. Belt-shaped member 11,12 Edge 13 Female mating part 13a,13b Fitting groove 14 Male mating part 14a,14b Fitting protrusion 14c Groove between protrusions 18 Rolled and stacked body 19 Unmade pipe belt section 20 Pipe making equipment 21 Pipe making department 30 Obi Information Section 31 Guide body 32 Linear guide mechanism 39 Straight Guideway x Width direction of the straight guideway z Extension direction of the straight guideway (feed direction of the unprocessed pipe belt) 40 Convex guide 41 Mounting frame 45 Position adjustment plate 46 Slide engagement part 47 Adjustment means 61 Set screw (fixing means) 50 Guide section 52 Guide protrusion 52a Slope

Claims

1. A pipe making device for making a spiral pipe made of a spirally wound belt-shaped member by fitting together fitting recesses and fitting protrusions formed on adjacent edges of the spirally wound belt-shaped member at different circumferences, the device comprising: a pipe making section that overlaps the edge of the unmade pipe band portion of the band-shaped member with the edge of the pipe end portion that is continuous with the unmade pipe band portion in the previously made pipe portion of the spiral pipe, and fits the fitting recesses and fitting protrusions of these edges together; a band guide section for guiding the unprocessed pipe band portion to the pipe processing section; a convex strip guide provided in the band guide section or the pipe making section, which guides the fitting convex strip from the side before the concave-convex fitting; A pipe making apparatus comprising:

2. the band guide unit has a guide body portion including a linear guide path, and a linear guide mechanism provided in the guide body portion and guiding the unprocessed pipe band portion straight along the linear guide path, A pipe making apparatus as described in claim 1, wherein the ridge guide has an attachment frame attached to the guide main body portion and a guide portion supported by the attachment frame so as to be positioned to the side of the path of the engaging ridge in the linear guide path.

3. 3. A pipe manufacturing apparatus as claimed in claim 2, wherein the guide portion has a guide projection that projects along the linear guide path toward the upstream side in the feeding direction of the unmade pipe band portion.

4. 4. A pipe producing apparatus according to claim 3, wherein the guide projection has a slope oblique to the extending direction of the linear guide path and is tapered toward the upstream side.

5. 5. A pipe making apparatus according to claim 2, wherein the mounting frame is mounted to the guide body portion so that its position can be adjusted in the width direction of the linear guide path.

6. A pipe making apparatus as described in any one of claims 2 to 4, wherein the mounting frame is provided with a slide engagement portion that is slidably engaged with the guide main body portion in the width direction of the linear guide path, and a fixing means that releasably fixes the slide engagement portion to any position within the width direction sliding range.

7. 7. A pipe producing apparatus according to claim 6, wherein the mounting frame is provided with an adjustment means for adjusting the position of the slide engagement portion in the width direction.

8. A pipe producing apparatus according to any one of claims 2 to 4, wherein the mounting frame is detachably attached to the guide main body portion.

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