Pipe making device for helical pipe

Abstract

To prevent a belt-like member from being damaged by a rotational drive of a drive roller of a pipe making device when a helical pipe is made from the belt-like member by the pipe making device.SOLUTION: A pipe making device 20 includes: an outer roller 31 that contacts an outer peripheral side of a trailing belt part 19 of an unmade pipe that follows a pipe end part 9e of a preceding pipe part 9 that was previously produced in the belt-like member 10; and an inner roller 32 that contacts an inner peripheral side of the trailing belt part 19. The rollers 31, 32 clamp the trailing belt part 19. A drive motor 33 rotates a drive roller 32 consisting of at least one of the outer roller 31 and the inner roller 32. The drive roller 32 includes: a roller body 32a made of metal that is connected to the drive motor 33 so as to be able to transmit torque; and an annular roller outer periphery member 36 made of resin or rubber that covers an outer periphery of the roller body 32a.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a pipe manufacturing apparatus for manufacturing a helical pipe from a strip-shaped material, and in particular to a helical pipe manufacturing apparatus suitable for rehabilitating deteriorated existing pipes. [Background technology]

[0002] A method for rehabilitating an existing pipe, such as an aging sewer pipe, by lining the inner periphery of the pipe with a rehabilitation pipe is known (see Patent Documents 1 and 2, etc.). The rehabilitation pipe is, for example, a helical pipe formed by helically winding a long strip-shaped member (profile). As the strip-shaped member, for example, one in which a steel reinforcing strip is provided on the outer peripheral side of a synthetic resin strip body (the side facing the outer peripheral side of the helical pipe (rehabilitating pipe) when manufactured) is known. Furthermore, a strip-shaped member in which the surface of the reinforcing strip is coated with a resin layer is known.

[0003] Rehabilitated pipes (helical pipes) are produced by a pipe-making machine. This type of pipe-making machine includes an outer roller that contacts the outer peripheral side of a band-shaped member, an inner roller that contacts the inner peripheral side of the band-shaped member, and a drive motor connected to the outer roller. Typically, the outer peripheral surface of the outer roller has an uneven pattern such as a knurled pattern formed thereon. The outer roller and inner roller clamp the trailing band portion of the unmade pipe on the band-shaped member, and the drive motor rotates the trailing band portion, feeding it ahead of the end of the preceding pipe portion that has already been made. As a result, the trailing band portion is incorporated into the preceding pipe portion to form a new pipe end, and the helical pipe is stretched and produced. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-053842 [Patent Document 2] Japanese Patent Publication No. 2022-034908 Summary of the Invention [Problem to be solved by the invention]

[0005] In this type of pipe-making device, the belt-shaped member can be damaged by the rotation of the driving rollers, such as the outer roller. For example, in a belt-shaped member with a reinforcing belt material including a resin coating layer, the resin coating layer can be scraped off. This can cause installation problems, such as the outer roller spinning freely and the pipe-making process stopping. Furthermore, the steel of the reinforcing belt material can be exposed, causing rust. In view of the above circumstances, the present invention aims to prevent damage to a strip-shaped member caused by the rotational drive of a drive roller when a spiral tube is produced from the strip-shaped member using a pipe producing device. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a pipe making device for making a helical pipe by fitting opposite edges of a spirally wound belt-shaped member one turn apart, the device comprising: an outer roller that contacts the outer peripheral side portion of the belt-shaped member; an inner roller that contacts the inner peripheral side surface of the belt-shaped member and cooperates with the outer roller to pinch the belt-shaped member; a drive motor that rotates and drives the drive roller, which is composed of at least one of the outer roller and the inner roller; wherein the drive roller is a roller body made of metal connected to the drive motor so as to be able to transmit torque; an annular roller outer peripheral member made of resin or rubber that covers the outer periphery of the roller body; The present invention is characterized by comprising:

[0007] In this pipe making device, the rotational torque of a drive motor is transmitted to a drive roller consisting of at least one of an outer roller and an inner roller, which rotates and drives the drive roller, thereby fitting opposing edges of the spirally wound strip material one turn apart, and producing a spiral pipe. Of the outer and inner rollers, the drive roller has a roller outer peripheral member made of resin or rubber that contacts the belt-shaped member, while the metal roller body does not come into direct contact with the belt-shaped member, thereby preventing damage to the belt-shaped member by the drive roller. The driven roller, which is not connected to the drive roller, of the outer roller and the inner roller is rotated by the belt-shaped member being fed, so that even if the metal part of the driven roller comes into contact with the belt-shaped member, damage to the belt-shaped member can be prevented.

[0008] Preferably, the outer roller is a driven roller not connected to the drive motor, and the inner roller is the drive roller. The outer periphery of the inner roller, which is the drive roller, is made of a roller outer periphery member made of resin or rubber, which can prevent damage to the inner periphery side of the belt-shaped member, and ultimately prevent damage to the inner periphery surface of the rehabilitating pipe.

[0009] Preferably, the roller outer peripheral member has an uneven pattern formed on its outer peripheral surface. This increases the contact area between the roller outer peripheral member, and therefore the outer peripheral surface of the drive roller, and the belt-shaped member. Therefore, damage to the belt-shaped member can be reliably prevented. Furthermore, the driving force of the drive roller can be reliably transmitted to the belt-shaped member, ensuring reliable production of a spiral tube. In other words, since there is no need to tightly clamp the belt-shaped member between the outer roller and the inner roller to transmit the driving force, damage to the belt-shaped member can be more reliably prevented.

[0010] Preferably, the uneven pattern is a knurling pattern, such as a flat knurling pattern, a diagonal knurling pattern, or a cross knurling pattern.

[0011] Preferably, the roller outer peripheral member is prevented from rotating relative to the roller body by a rotation preventing means. This ensures that the rotational drive force input from the drive motor to the roller body is transmitted to the roller outer periphery member by the rotation prevention means. There is no need to adhere the roller body and the roller outer periphery member with adhesive, making them easy to separate and replace. Preferably, the anti-rotation means includes key grooves formed on the outer circumferential surface of the roller body and the inner circumferential surface of the roller outer member at the same circumferential positions, and a key fitted into the key grooves of the roller body and the roller outer member. The key straddles the roller body and the roller outer member, ensuring reliable anti-rotation. By removing the key, the roller outer member can be easily separated from the roller body.

[0012] Preferably, the outer roller has a roller shaft and a plurality of disk-shaped roller portions spaced apart from one another on the outer periphery of the roller shaft, and one or more annular spacers are provided on the outer periphery of the roller shaft between adjacent roller portions. The spacing between adjacent rollers can be adjusted by adjusting the axial length and number of the annular spacers, thereby ensuring that each roller fits securely into the outer circumferential groove of the belt-shaped member. [Effects of the Invention]

[0013] According to the present invention, when a spiral pipe is produced from a strip-shaped member using a pipe producing device, the strip-shaped member can be prevented from being damaged by the rotational drive of the drive roller of the pipe producing device. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional side view of an existing pipe being rehabilitated by producing a rehabilitating pipe from a strip-shaped member using a pipe producing device according to a first embodiment of the present invention. [Figure 2(a)] FIG. 2(a) is a cross-sectional view showing an example of the belt-shaped member. [Figure 2(b)] FIG. 2(b) is an enlarged cross-sectional view of the circle IIb in FIG. [Figure 2(c)] FIG. 2(c) is a cross-sectional view showing how the subsequent belt portion of the belt-shaped member is assembled into a rehabilitating pipe by the pipe producing device. [Figure 3] 3 is a front cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a side view showing the drive unit of the pipe producing apparatus. [Figure 5] FIG. 5 is a sectional view of the steps taken along the VV bending line in FIG. [Figure 6] FIG. 6 is a side view of a drive unit of a pipe producing apparatus according to a second embodiment of the present invention. [Figure 7] FIG. 7 is a sectional view of the steps taken along the bend line VII-VII in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 5)> As shown in Figure 1, the present invention is applied to, for example, the rehabilitation of an aged existing 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. Note that the existing pipe to be rehabilitated is not limited to a sewer pipe, but may also be a water supply pipe, an agricultural water pipe, a gas pipe, a hydroelectric power generation water pipe, a tunnel, etc.

[0016] As shown in Fig. 1, the rehabilitation pipe 9 is a helical pipe formed by helically winding a band-shaped member 10. As shown in Fig. 2(a), the band-shaped member 10 includes a band body 11 made of a synthetic resin such as polyvinyl chloride and a reinforcing band material 16 made of a metal such as steel, and extends long in the band length direction (the direction perpendicular to the plane of the drawing). Fitting portions 13 and 14 with complementary concave and convex cross-sectional shapes are formed on both edges of the band body 11 in the band width direction (the left-right direction in Fig. 2(a)). A rib 15 with a T-shaped cross section is formed in the middle of the band body 11 in the band width direction so as to protrude toward the back side (the outer periphery, the lower side in Fig. 2(a)).

[0017] A reinforcing strip 16 having a roughly M-shaped cross section is provided on the back side (outer peripheral side, lower side in Figure 2(a)) of the strip body 11. The reinforcing strip 16 has a body 16a that protrudes toward the outer peripheral side and leg portions 16b on both sides thereof. The leg portions 16b are bent into a C shape to form an outer peripheral groove portion 16c. The metal surface of the reinforcing strip 16 is covered with a coating resin layer 17. Examples of resin materials for the coating resin layer 17 include polyethylene (PE) and rigid polyvinyl chloride (PVC). From the viewpoint of resistance to abrasion, rigid polyvinyl chloride (PVC) is more preferable, but other resins may also be used. The cross-sectional shape of the belt-shaped member 10 is not limited to the example shown in FIG. 2(a) and can be modified as appropriate.

[0018] As shown in Figures 1 and 2(b), a strip-shaped member 10 is wound spirally around the inner periphery of the existing pipe 1, and mating portions 13, 14 of adjacent edges that are one turn apart are joined together by a concave-convex fit, thereby constructing a spiral tubular rehabilitation pipe 9. In the rehabilitation pipe 9, the back side of the strip-shaped member 10 faces the outer periphery (the lower side in Figure 2(b)), and the front side of the strip-shaped member 10 faces the inner periphery (the upper side in Figure 2(b)). The flat front surface 12 of the strip body 11 forms the inner periphery of the rehabilitation pipe 9.

[0019] As shown in Figure 1, the rehabilitated 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 of the extension in the pipe axial direction of the rehabilitated pipe 9. A subsequent strip portion 19 of unmade pipe in the strip-shaped member 10 is unwound from a winding drum 5 on the ground, passes through the starting manhole 4 and the inside of the rehabilitated pipe 9 (the previously made pipe portion in the strip-shaped member 10), and is introduced into the pipe making device 20 on the pipe end 9e.

[0020] As shown in Figure 3, the pipe making device 20 includes an apparatus main body 21, a pipe end guide 22, and a drive unit 30. The apparatus main body 21, which is shown schematically in Figure 3, is formed in a frame or housing shape and is arranged on the inner side of the rehabilitating pipe end 9e. The length of the apparatus main body 21 along the circumferential direction of the rehabilitating pipe is approximately one-several to one-several tenths of the circumferential length of the rehabilitating pipe 9. The apparatus main body 21 is not provided with an inner circumferential regulating body such as a link roller that regulates the pipe end 9e from the inner circumferential side, and the pipe end 9e other than where the apparatus main body 21 is arranged is open to the inner circumferential side.

[0021] A pipe end guide 22 is provided at the bottom in the height direction HD of the device body 21, along the pipe diameter direction of the rehabilitating pipe 9. The pipe end guide 22 is engaged with the pipe end 9e so as to be slidable in the spiral winding direction of the rehabilitating pipe 9.

[0022] As shown in Fig. 3, a drive unit 30 is provided in the device body 21. As shown in Figs. 3 and 4, the drive unit 30 includes a pair of an outer roller 31 and an inner roller 32, and a drive motor 33. The axes of the rollers 31 and 32 are oriented in a width direction WD that is perpendicular to the longitudinal direction LD and height direction HD of the device body 21.

[0023] 4, the outer roller 31 has a roller shaft 31c along the axis of the roller 31 and two (plural) roller portions 31a. The roller portion 31a is formed in a disk shape with a larger diameter and a shorter axis length than the roller shaft 31c. The two roller portions 31a are provided on the outer periphery of the roller shaft 31c, spaced apart from each other in the axial direction of the outer roller 31. The inner roller 32 is formed in a cylindrical shape parallel to the outer roller 31 .

[0024] The outer roller 31 faces the outer peripheral side of the trailing belt portion 19. Each roller portion 31a is inserted into the outer peripheral groove portion 16c of the trailing belt portion 19 and pressed against the groove bottom of the outer peripheral groove portion 16c. More specifically, the outer peripheral surface of the roller portion 31a contacts the coating resin layer 17 on the surface of the leg portion 16b. The inner roller 32 is in contact with the inner peripheral side surface 12 of the trailing belt portion 19 .

[0025] The output shaft of the drive motor 33 is connected to a drive roller consisting of at least one of an outer roller 31 and an inner roller 32 via a torque transmission mechanism 34 such as a gear. The drive roller is driven to rotate by the drive motor 33. For example, the drive motor 33 is connected to the inner roller 32, and the inner roller 32 serves as the drive roller. The outer roller 31 is a driven roller that is not connected to the drive motor 33.

[0026] 4 and 5, the inner roller 32 (drive roller) includes a roller body 32a and a roller outer peripheral member 36. The roller body 32a is configured as a cylindrical or columnar body made of metal such as steel. A torque transmission mechanism 34 is connected to the roller body 32a. In turn, the roller body 32a is connected to a drive motor 33 so as to be able to transmit torque.

[0027] The roller outer peripheral member 36 covers the outer periphery of the roller main body 32a. The roller outer peripheral member 36 is formed in a cylindrical (annular) shape with an inner diameter substantially equal to the outer diameter of the roller main body 32a and with an axial length substantially equal to that of the roller main body 32a. The roller outer peripheral member 36 covers the entire outer periphery of the roller main body 32a. The thickness t of the roller outer peripheral member 36 36 (the difference between the outer radius and the inner radius) depends on the outer diameter of the entire inner roller 32, but t 36 = A few mm is fine, t 36 It may be about ten or so mm to several tens of mm.

[0028] The roller outer peripheral member 36 is made of resin or rubber. For example, nylon 6 (PA6) or MC nylon is used as the resin material for the roller outer peripheral member 36 from the viewpoint of abrasion resistance. However, the resin material for the roller outer peripheral member 36 is not limited to these, and may be polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer resin (ABS), acrylic resin (PMMA), polyacetal (POM), polycarbonate (PC), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc. When the roller outer peripheral member 36 is made of rubber, examples of the rubber material include natural rubber, urethane rubber, silicone rubber, nitrile rubber, acrylic rubber, fluororubber, and styrene rubber.

[0029] As shown in FIGS. 4 and 5 , the roller outer peripheral member 36 is prevented from rotating relative to the roller main body 32a by a rotation-preventing means 40. The rotation-preventing means 40 includes a keyway 41 formed on the outer peripheral surface of one end of the roller main body 32a, a keyway 42 formed on the inner peripheral surface of one end of the roller outer peripheral member 36, and a key 43. The keyways 41, 42 are aligned with each other, and the key 43 is fitted into these keyways 41, 42. The key 43 may be, for example, a half-circular parallel key, but is not limited to this and may also be a double-circular parallel key, a sloped key, a crescent key, or the like. The key 43 straddles the roller main body 32a and the roller outer peripheral member 36 to restrict relative rotation between them. Note that multiple rotation-preventing means 40 each consisting of the keyways 41, 42 and the key 43 may be provided at intervals around the circumferential direction of the inner roller 32. The rotation-preventing means 40 may also be provided at both ends of the inner roller 32.

[0030] As shown in Figures 4 and 5, an uneven pattern 38 is formed over the entire outer peripheral surface of the roller outer peripheral member 36. The uneven pattern 38 is made up of a flat knurling. The flat knurling has linear ridges 38a and linear grooves 38b that extend along the axis of the inner roller 32. These linear ridges 38a and linear grooves 38b are provided alternately in the circumferential direction of the inner roller 32. Note that the uneven pattern 38 is not limited to a flat knurling, and may be a cross knurling or a diagonal knurling.

[0031] In the pipe making device 20, the outer roller 31 and the inner roller 32 cooperate with each other to clamp the trailing strip portion 10 of the strip-shaped member 10. The rotational torque of the drive motor 33 is transmitted to the inner roller 32 (drive roller), causing the inner roller 32 to rotate. In the inner roller 32 (drive roller), the rotational driving force input to the roller main body 32a can be reliably transmitted to the roller outer peripheral member 36 by the anti-rotation means 40.

[0032] As a result, the trailing band portion 19 is pushed obliquely toward the pipe end portion 9e, and as shown in Figure 2(c), the pipe end portion 9e and the opposing fitting portions 13, 14 of the trailing band portion 19 are fitted together, thereby progressing the pipe making. In addition, the reaction force of the pushing propels the pipe making device 20 (self-propelled) in the spiral winding direction. The metal outer roller 31 is rotated in response to the feeding of the trailing strip 19. This prevents the coating resin layer 17 of the trailing strip 19 from being worn away at the contact portion with the outer roller 31. This prevents the steel of the reinforcing strip 16 from being exposed, preventing rust from forming. Furthermore, the outer roller 31 does not spin idly, which prevents problems such as pipe production stopping due to the outer roller 31 spinning idly. In the inner roller 32, which is the drive roller, the roller outer peripheral member 36 made of resin is pressed against the inner peripheral side surface 12 of the trailing belt portion 19. The roller body 32a made of metal does not come into direct contact with the belt-shaped member 10. Therefore, damage to the belt-shaped member 10 by the drive roller 32 can be suppressed. In particular, because the roller outer peripheral member 36 is made of 6 nylon (PA6) or MC nylon, which have excellent wear resistance, wear on the inner peripheral side surface 12 of the belt-shaped member 10 can be sufficiently suppressed.

[0033] The uneven pattern 38 is formed on the outer peripheral surface of the roller outer peripheral member 36, which increases the contact area between the inner roller 32 (drive roller) and the following belt portion 19. This more reliably prevents damage to the belt-shaped member 10. The ability to scrape the surface resin of the belt-shaped member 10 is proportional to the driving force of the drive roller and inversely proportional to the contact area. Furthermore, by increasing the contact area between the inner roller 32 (drive roller) and the trailing band portion 19, the driving force of the inner roller 32 (drive roller) can be reliably transmitted to the trailing band portion 19. Therefore, even if the pipe making device 20 hits steps or irregularities on the inner surface of the existing pipe 1 and resistance is generated, it is possible to prevent the inner roller 32 (drive roller) from easily spinning (slipping) and causing problems such as pipe making stopping. Furthermore, since there is no need to pinch the trailing belt portion 19 tightly between the outer roller 31 and the inner roller 32 to transmit the driving force, damage to the belt-shaped member 10 can be prevented more reliably.

[0034] Next, another embodiment of the present invention will be described. In the following embodiment, the same components as those already described will be denoted by the same reference numerals in the drawings and the description thereof will be omitted. <Second embodiment (FIGS. 6 and 7)> 6, in a pipe making apparatus 20B according to a second embodiment of the present invention, a drive motor 33 is connected to the inner roller 32 via a torque transmission mechanism 34, and is also connected to the shaft 31c of the outer roller 31B so as to be able to transmit torque. Therefore, both the outer roller 31B and the inner roller 32 are drive rollers that are rotated and driven by the drive motor 33.

[0035] 6 and 7, each roller portion 31a of the outer roller 31B includes a disk-shaped roller main body 31d made of metal such as steel, and a roller outer peripheral member 37. The roller main body 31d is connected to a drive motor 33 via a shaft 31c so as to be able to transmit torque.

[0036] The roller outer peripheral member 37 covers the outer periphery of the roller body 31d. The roller outer peripheral member 37 is formed in an annular shape with an inner diameter substantially equal to the outer diameter of the roller body 31d and with a thickness in the axial direction substantially equal to that of the roller body 31d. The roller outer peripheral member 37 covers the entire outer periphery of the roller body 31d. The radial thickness t 37 (the difference between the outer radius and the inner radius) depends on the outer diameter of the outer roller 31B, but 37 = A few mm is fine, t 37 It may be about ten or so mm to several tens of mm.

[0037] The material of the roller outer peripheral member 37 is resin or rubber, similar to the roller outer peripheral member 36 of the inner roller 32, and is preferably 6 nylon (PA6) or MC nylon from the viewpoint of abrasion resistance, etc. However, the resin material of the roller outer peripheral member 37 is not limited to these, and may be polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer resin (ABS), acrylic resin (PMMA), polyacetal (POM), polycarbonate (PC), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc. When the roller outer peripheral member 37 is made of rubber, examples of the rubber material include natural rubber, urethane rubber, silicone rubber, nitrile rubber, acrylic rubber, fluororubber, styrene rubber, etc.

[0038] As shown in FIGS. 6 and 7 , the roller outer peripheral member 37 is prevented from rotating relative to the roller main body 31d by a rotation-preventing means 50. The rotation-preventing means 50 includes a keyway 51 formed on the outer peripheral surface of the roller main body 31d, a keyway 52 formed on the inner peripheral surface of the roller outer peripheral member 37, and a key 53. The keyways 51 and 52 are aligned with each other, and a key 53 is fitted into these keyways 51 and 52. The key 53 is, for example, a half-circular parallel key, but is not limited to this and may be a double-circular parallel key, a sloped key, a crescent key, or the like. The key 53 spans the roller main body 31d and the roller outer peripheral member 37 and restricts relative rotation between them. Note that a plurality of rotation-preventing means 50 each consisting of the keyways 51 and 52 and the key 53 may be provided at intervals around the circumferential direction of the roller portion 31a. The anti-rotation means 50 is arranged so as not to interfere with the trailing belt portion 19 between the rollers 31 and 32.

[0039] An uneven pattern 39 is formed over the entire outer peripheral surface of the roller outer peripheral member 37. The uneven pattern 39 is formed by a flat knurling. The flat knurling has linear ridges 39a and linear grooves 39b that extend along the axis of the outer roller 31B. These linear ridges 39a and linear grooves 39b are provided alternately in the circumferential direction of the roller outer peripheral member 37. Note that the uneven pattern 39 is not limited to a flat knurling, and may be a cross knurling or a diagonal knurling.

[0040] 6, one or more annular spacers 35 are provided on the shaft 31c of the outer roller 31B between adjacent roller portions 31a. The distance between adjacent roller portions 31a is adjusted by adjusting the axial length and number of the annular spacers 35. This allows each roller portion 31a to be reliably fitted into the outer peripheral groove portion 16c of the trailing belt portion 19.

[0041] In the pipe making device 20B, the roller outer peripheral member 37 of the outer roller 31B directly contacts the outer peripheral side of the trailing band portion 19. Specifically, the roller outer peripheral member 37 contacts the coating resin layer 17 that forms the groove bottom of the outer peripheral groove portion 16c of the trailing band portion 19. The outer peripheral surface of the roller outer peripheral member 37 is formed with an uneven pattern 39, which increases the contact area between the outer roller 31B and the coating resin layer 17. Therefore, scraping of the coating resin layer 17 can be reliably prevented. This reliably prevents the outer roller 31B from spinning freely, and the rotational driving force of the outer roller 31B can be reliably transmitted to the band-shaped member 19. As a result, combined with the effect of increasing the contact area between the inner roller 32 and the inner peripheral side of the trailing band portion 19 due to the uneven pattern 38 of the inner roller 32, the pipe making device 20 can be reliably advanced, making it less likely that problems such as pipe making will stop.

[0042] 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 coating resin layer 17 of the reinforcing strip material 16 of the strip-shaped member 10 may be omitted. The strip-shaped member 10 may not include the reinforcing strip material 16 and may be composed of only the strip body 11 made of synthetic resin. The pipe making device may have an inner circumference regulating body such as a link roller. The drive unit 30 may have two or more pairs of rollers each consisting of an outer roller and an inner roller. The outer roller of the drive unit 30 may constitute a drive motor connected to the drive motor 33 so as to be able to transmit torque, while the inner roller may constitute a driven roller. Of the outer roller and inner roller, only the outer roller may have a roller outer peripheral member 37 made of resin or rubber. The uneven patterns 38, 39 are not limited to knurling, but may be a mesh pattern, a tread pattern, or the like. The roller outer peripheral members 36, 37 do not necessarily have to have the concave and convex patterns 38, 39 formed thereon. The outer roller 31 (FIG. 4) constituting the driven roller may also be provided with an annular spacer 35 similar to that of the outer roller 31B (FIG. 6) constituting the drive roller. The fitting portions 13, 14 between the pipe end portion 9e and the subsequent belt portion 19 may be directly clamped between the outer roller and the inner roller, and the fitting portions 13, 14 may be fitted together between the outer roller and the inner roller, thereby allowing the pipe production to proceed. The pipe making device is not limited to a self-propelled type in which the device is propelled (self-propelled) in a spiral shape and a spiral pipe is made behind it, but may also be a push-type device in which the spiral pipe is pushed out while being made at a fixed position such as a manhole, or a towing type device in which the tip of the made spiral pipe is towed. [Industrial Applicability]

[0043] The present invention can be applied to, for example, a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0044] 1 Existing pipes 9 Rehabilitation pipe (spiral pipe) 9e Tube end 10. Belt-shaped member 11 Obi body 12 Inner periphery side (inner periphery of rehabilitated pipe) 16 Reinforcing strip 16c Outer circumferential groove 17 Coating resin layer 19 Trailing belt 20 Pipe making equipment 20B Pipe making equipment 21 Device body 22 Pipe end guide 30 Drive Unit 31 Outer roller (driven roller) 31B Outer roller (drive roller) 31d Roller body 32 Inner roller (drive roller) 32a Roller body 33 Drive motor 34 Torque transmission mechanism 35 Annular spacer 36 Roller outer peripheral member 37 Roller outer peripheral member 38 Concave and Convex Pattern 39 Concave and Convex Pattern 40 Anti-rotation means 50 Anti-rotation means

Claims

1. A pipe making device for making a spiral pipe by fitting opposite edges of a spirally wound strip-shaped member together, the edges being offset from each other by one turn, an outer roller that contacts the outer peripheral side portion of the belt-shaped member; an inner roller that contacts the inner peripheral side surface of the belt-shaped member and cooperates with the outer roller to pinch the belt-shaped member; a drive motor that rotates and drives the drive roller, which is composed of at least one of the outer roller and the inner roller; wherein the drive roller is a roller body made of metal connected to the drive motor so as to be able to transmit torque; an annular roller outer peripheral member made of resin or rubber that covers the outer periphery of the roller body; A spiral pipe manufacturing apparatus comprising:

2. 2. A pipe making apparatus according to claim 1, wherein the outer roller is a driven roller not connected to the drive motor, and the inner roller is the drive roller.

3. 2. A pipe making apparatus according to claim 1, wherein an uneven pattern is formed on the outer peripheral surface of the roller outer peripheral member.

4. 4. A pipe manufacturing apparatus according to claim 3, wherein the uneven pattern is a knurled pattern.

5. 5. A pipe making apparatus according to claim 1, wherein the roller outer peripheral member is prevented from rotating relative to the roller body by a rotation preventing means.

6. A pipe making apparatus described in any one of claims 1 to 4, wherein the outer roller has a roller shaft and a plurality of disk-shaped roller portions arranged spaced apart from each other on the outer periphery of the roller shaft, and one or more annular spacers are provided on the outer periphery of the roller shaft between adjacent roller portions.

Images