Pipe making device and unwinding method for spiral pipe

Abstract

To provide a pipe making device that can be easily transformed between the inner circumference restricted form and the inner circumference released form in the middle of making of spiral pipes.SOLUTION: Driving rollers 22a and 22b provided on a device body 21 of a pipe making device 20 clamp a subsequent strip section 19 of an unmade pipe of a strip member 19 and push it into a pipe end 3e of a spiral pipe 3. A propulsion forward unit 23 of the device body 21 is provided with a pipe end guide 30, a brake mechanism 40, and a propulsion forward side connection seat 29a. A propulsion forward side connection section 76 of an inner circumference restriction body 70 is detachably connected to the propulsion forward side connection seat 29a. A propulsion rear side connection section 72a of the inner circumference restriction body 70 is detachably connected to a propulsion rear side connection seat 27 of the propulsion rear part of the device body 21.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to an apparatus for producing a helical pipe from a long strip-shaped material and a method for unwinding the helical pipe, and in particular to a self-propelled pipe producing apparatus and unwinding method that are propelled in the spiral winding direction while producing the pipe. [Background technology]

[0002] For example, in order to rehabilitate an existing pipe such as an aged sewer pipe, a method is known in which a pipe making device is used to line the inner circumference of the existing pipe with a rehabilitated pipe (helical pipe) formed by helically winding a long strip-shaped member (profile) (see Patent Documents 1 and 2, etc.). Patent Documents 1 and 2 disclose a self-propelled pipe making device that makes a pipe while being propelled in a helical winding direction. The self-propelled pipe making device includes a device main body arranged at a pipe end on the tip side in the extension direction along the pipe axis of the rehabilitated pipe being made, at least a pair of drive rollers provided on the device main body, and pipe end guides provided separately from each other in the longitudinal direction of the device main body. The longitudinal direction of the device main body is directed to the helical winding direction, i.e., the propulsion direction. By driving the drive rollers, the subsequent strip portion of the unmade pipe in the strip-shaped member is incorporated into the pipe end and a propulsion force is obtained. Each pipe end guide is slidably engaged with the pipe end of the rehabilitated pipe.

[0003] Furthermore, the pipe making machine of Patent Document 1 is an inner circumference regulating type (inner circumference regulating form) that includes a spiral ring-shaped inner circumference regulating body called a link roller. Both circumferential ends of the inner circumference regulating body are connected to the machine body. The inner circumference regulating body adheres to the inner circumference of the pipe end of the rehabilitating pipe, thereby regulating the pipe end from the inner circumference side.

[0004] The pipe making apparatus of Patent Document 2 is an inner circumference open type (inner circumference open form) that does not have an inner circumference regulating body. The part of the pipe end other than the location where the main body of the apparatus is placed is open to the inner circumference side. Furthermore, the pipe making apparatus of Patent Document 2 has an outer circumference regulating wire instead of an inner circumference regulating body. The outer circumference regulating wire is wound around the outer circumference of the pipe end, and both ends are connected to the pipe end guide or the main body of the apparatus. The circumference of the pipe end and therefore the pipe diameter can be adjusted by adjusting the length of the outer circumference regulating wire. Furthermore, a brake mechanism is added to the pipe end guide in front of the advancing in the pipe making apparatus of Patent Document 2. During advancing, frictional resistance (braking force) can be applied between the pipe end and the brake mechanism. By adjusting the brake force, the advancing speed can be increased or decreased relative to the feed speed of the subsequent belt section, thereby expanding or reducing the diameter of the pipe. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication WO2015 / 186779 [Patent Document 2] JP 2020-093420 A Summary of the Invention [Problem to be solved by the invention]

[0006] The inner circumference restricting type pipe making device can make pipes with a constant circumference by attaching the pipe end to an inner circumference restricting body. It can make pipes stably not only in straight sections where the pipe axis of an existing pipe is straight, but also in curved sections where the pipe axis is bent. However, the flow path cross-sectional area is reduced by the inner circumference restricting body, so there is a large obstruction to the flow. There is also a concern that the inner circumference restricting body may break or fall over.

[0007] In contrast, the open inner periphery pipe making equipment has less flow obstruction and is safer than the restricted inner periphery type. On the other hand, it is not easy to control the pipe diameter. Also, it is difficult to make pipes in curved sections.

[0008] As described above, the inner circumference restriction type pipe making machine and the inner circumference open type pipe making machine have mutually opposing advantages and disadvantages, so if one pipe making machine could be changed to the inner circumference restriction type or the inner circumference open type depending on the situation, it would be possible to make pipes that make use of the advantages of each type. However, it is not easy to transform the current pipe making machine from the inner circumference restriction type to the inner circumference open type, or vice versa, during pipe making, because it requires complicated dismantling and changing of parts. For example, when trying to remove the forward pipe end guide with the brake mechanism to transform from the inner circumference open type to the inner circumference restriction type, it is difficult to remove the forward pipe end guide because the locking part of the forward pipe end guide is sandwiched between the outer circumference of the pipe end and the existing pipe, and when it is removed, the pipe making machine becomes unstable. Furthermore, when unwinding a rehabilitated pipe (helical pipe) using an inner circumference restricting type pipe making device, if the unwinding ring, which is made by winding a strip-shaped member spirally one or more times, is held by an unwinding jig, there is a risk that the inner circumference restricting body and the unwinding jig will interfere with each other, making it impossible to make the pipe.

[0009] In view of the above circumstances, the first object of the present invention is to provide a pipe making device that can be easily transformed between an inner circumference restricted type (inner circumference restricted form) and an inner circumference open type (inner circumference open form) during the production of a helical pipe. The second object of the present invention is to provide a method for unwinding a helical pipe without interfering with the unwinding jig when producing a pipe in the inner circumference restricted form. [Means for solving the problem]

[0010] In order to solve the first problem, the present invention provides a pipe making apparatus that can be transformed between an inner circumference release mode in which the pipe making is performed while the pipe is propelled in the spiral winding direction with the pipe end portion at the tip side in the extension direction along the pipe axis of the helical pipe being made released toward the inner circumference side, and an inner circumference restricted mode in which the pipe making is performed while the pipe is propelled in the spiral winding direction with the pipe end portion restricted from the inner circumference side by a helical annular inner circumference restricting body, A non-annular device body is disposed so as to be axially advanced at one location of the tube end with a longitudinal direction facing the advancement direction along the spiral winding direction; At least one pair of drive rollers are provided in the device body and configured to pinch a subsequent band portion of the unmanufactured pipe in the band-shaped member to be the rehabilitated pipe and push it into the pipe end portion; a plurality of tube end guides each having a locking portion that is slidably locked to an outer circumferential groove formed in the belt-shaped member that constitutes the tube end, the tube end guides being spaced apart from one another in the longitudinal direction of the device body; a brake mechanism that constitutes a forward propulsion unit together with a forward propulsion tube end guide provided in the forward propulsion portion of the device body among the plurality of tube end guides and applies frictional resistance between the brake mechanism and the tube end during the propulsion; a forward propulsion side connecting seat provided in the forward propulsion unit and adapted to detachably connect the forward propulsion side connecting portion of the inner circumference regulating body; a rear-side connecting seat provided in a rear portion of the device body and configured to detachably connect the rear-side connecting portion of the inner periphery regulating body; The present invention is characterized by comprising:

[0011] By removing the inner circumference regulating body, this pipe making device can be used as an inner circumference open type (inner circumference open form). The length of the device body is sufficiently smaller than the circumference of the pipe end, and the part of the pipe end other than the part where the device body is located is released to the inner circumference side. By adjusting the frictional resistance (braking force) with the pipe end by the brake mechanism, the advancing speed can be increased or decreased relative to the feed speed of the subsequent belt section, thereby expanding or reducing the pipe diameter. By connecting the forward thrust connection portion of the inner circumference regulating body to the forward thrust connection seat and connecting the rear thrust connection portion to the rear thrust connection seat from the inner circumference release form, the pipe making apparatus can be transformed into an inner circumference regulated type (inner circumference regulated form). When making a pipe with an inner circumference restriction, it is preferable to prevent frictional resistance (braking force) from the brake mechanism. The inner circumference regulating form can be transformed into an inner circumference released form by releasing the connection between the thrust front side connecting portion of the inner circumference regulating body and the thrust front side connecting seat, and releasing the connection between the thrust rear side connecting portion of the inner circumference regulating body and the thrust rear side connecting seat, and separating the inner circumference regulating body from the device main body.

[0012] Preferably, the pipe making apparatus further includes a connecting member that is detachable from the forward connecting seat, The thrust front side connection portion of the inner circumference regulating body is connected to the thrust front side connection seat via the connection member. When the pipe making apparatus is transformed from the inner circumference release configuration to the inner circumference restricted configuration, the connecting member is attached to the forward connecting seat and the forward connecting portion of the inner circumference restricting body is connected to the connecting member. The connecting member may be attached to the forward connecting seat with the forward connecting portion of the inner circumference restricting body connected to the connecting member. When the pipe making apparatus is transformed from the inner circumference restricted form to the inner circumference released form, the forward connection part of the inner circumference restricting body is disconnected from the connecting member, and the connecting member is removed from the forward connection seat. The connecting member may be removed from the forward connection seat while the forward connection part of the inner circumference restricting body is still connected to the connecting member.

[0013] Preferably, the connecting member has a connecting main body portion that engages with the propulsion front side connecting seat and a connecting shaft portion that protrudes from the connecting main body portion in a direction perpendicular to the propulsion direction, and the propulsion front side connecting portion is rotatably connected to the connecting shaft portion. When the pipe making apparatus is transformed from the inner circumference release configuration to the inner circumference restricted configuration, the connection body of the connection member is fitted into the forward thrust connection seat of the forward thrust unit, and the connecting shaft of the connection member is connected to the forward thrust connection part of the inner circumference restricting body. This allows the inner circumference restricting body and the forward thrust unit to be connected via the connection member. When the pipe making apparatus is transformed from the inner circumference restricted form to the inner circumference released form, the connection body of the connection member is removed from the forward thrust connection seat. The forward thrust connection part of the inner circumference restricting body may be separated from the connecting shaft of the connection member. This allows the inner circumference restricting body to be separated from the forward thrust unit.

[0014] Preferably, the front propulsion unit is provided with two connecting portions to which both ends of an outer periphery restricting wire that is wound around the outer periphery of the pipe end in the inner periphery release mode are respectively connected. As a result, when making a pipe with the inner circumference open, the circumference of the pipe end can be adjusted by wrapping the outer circumference restricting wire around the outer circumference of the pipe end and adjusting the length of the outer circumference restricting wire.

[0015] In order to solve the second problem, the method of the present invention is a method for unwinding using the pipe making apparatus, comprising the steps of: a winding ring is prepared by winding the belt-shaped member in a spiral shape once or more, and the pipe making device in the inner circumference open form is attached to the winding ring; While the edge portion of the unwinding ring at the start end side in the extension direction is maintained in shape by an annular unwinding jig, a spiral tube is produced by the tube producing device in several turns. Next, the inner circumferential regulating body is installed along the inner circumferential surface of the spiral tube, and the forward thrust side connecting portion of the inner circumferential regulating body is connected to the forward thrust side connecting seat, and the rearward thrust side connecting portion of the inner circumferential regulating body is connected to the rearward thrust side connecting seat; Thereafter, the unwinding jig is removed. As a result, in the area where the inner circumference regulating body would interfere with the unwinding jig if it were in the inner circumference regulating form, the pipe making device is put into the inner circumference open form, and the unwinding jig can maintain the shape of the unwinding ring while avoiding interference. By making several turns of pipe in this state, the pipe making device is advanced to an area where the inner circumference regulating body does not interfere with the unwinding jig. After that, by attaching the inner circumference regulating body, the pipe making device is transformed into the inner circumference regulating form, and a spiral pipe can be made. Effect of the Invention

[0016] According to the present invention, the pipe making apparatus can be easily transformed from an inner circumference restricted configuration to an inner circumference open configuration, or from an inner circumference open configuration to an inner circumference restricted configuration, during the process of making a spiral pipe. [Brief description of the drawings]

[0017] [Figure 1]Figure 1 shows a first usage mode of a pipe making apparatus according to one embodiment of the present invention, where Figure 1(a) is a plan cross-sectional view showing how the pipe making apparatus is in an inner circumference release configuration to rehabilitate a straight section of an existing pipe. Figure 1(b) is a plan cross-sectional view showing how the pipe making apparatus is in an inner circumference restriction configuration to rehabilitate a curved section of the existing pipe. Figure 1(c) is a plan cross-sectional view showing how the pipe making apparatus is in an inner circumference release configuration to rehabilitate another straight section of the existing pipe. [Diagram 2] Fig. 2(a) shows an example of a strip-shaped member to be a rehabilitating pipe lined with the existing pipe, and is a cross-sectional view taken along line IIa-IIa in Fig. 3. Fig. 2(b) is an enlarged cross-sectional view of the rehabilitating pipe at the circular portion IIb in Fig. 1(a). [Diagram 3] FIG. 3 is a front cross-sectional view taken along line III-III in FIG. 1(a), showing how a rehabilitating pipe is produced by the pipe producing apparatus with the inner periphery open configuration. [Figure 4] FIG. 4 is an enlarged view of the pipe making apparatus in the inner periphery open form. [Diagram 5] 5 is a cross-sectional view of the forward propulsion unit of the pipe making apparatus taken along line VV in FIG. [Figure 6] FIG. 6 is a plan view of the forward propulsion unit taken along line VI-VI in FIG. [Figure 7(a)] FIG. 7(a) is a plan view of a connecting member used in the transformation of the pipe making apparatus. [Figure 7(b)] FIG. 7(b) is a cross-sectional view of the connection member taken along line VIIb-VIIb in FIG. 7(a). [Figure 8(a)] FIG. 8(a) is a plan view showing how the connection member is attached to the front propulsion unit. [Figure 8(b)] FIG. 8(b) is a plan view showing a state in which the connection member is attached to the front propulsion unit. [Figure 9] FIG. 9 is a front cross-sectional view taken along line IX-IX in FIG. 1(b), showing how the pipe producing apparatus is set in an inner circumference restriction mode to produce a rehabilitated pipe. [Figure 10] FIG. 10 is a plan view showing the connection between the forward thrust portion of the main body of the pipe producing apparatus having the inner circumference restriction form and the inner circumference restriction body. [Figure 11] FIG. 11 is a front view of an unwinding jig used to unwind the rehabilitating pipe in a second mode of use of the pipe producing apparatus. [Figure 12] Fig. 12(a) is a side view showing the process of creating a winding ring in the second usage mode. Fig. 12(b) is a side view showing the process of assembling the pipe making device in the second usage mode. Fig. 12(c) is a side view showing the process of making a pipe within the interference region in the second usage mode. Fig. 12(d) is a side view showing the process of transforming into an inner circumference regulated form in the second usage mode. [Figure 13] FIG. 13 is a plan view showing the forward thrust portion of the main body of the pipe producing apparatus in the assembling process through the in-interference region pipe producing process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1(a) to 1(c) show the process of rehabilitating an aged existing pipe 1. The existing pipe 1 includes straight sections 1a, 1a', where the pipe axis is straight, and curved section 1b, where the pipe axis is curved. The existing pipe 1 is a sewerage pipe buried underground, but is not limited to this and may be a water supply pipe, an agricultural water pipe, a hydroelectric power generation water pipe, a gas pipe, a tunnel, etc. The inner wall of the existing pipe 1 is lined with a rehabilitation pipe 3. The rehabilitation pipe 3 is a spiral pipe composed of a long strip-shaped member 10.

[0019] As shown in Fig. 2(a), concave-convex fitting portions 13, 14 are formed on both edges of the belt-shaped member 10. On the outer peripheral side surface of the belt-shaped member 10, a peripheral groove 16 defined by a T-shaped rib 15 and the back of the concave-convex fitting portion 13, etc., is formed so as to extend in the belt length direction.

[0020] 2(b), in the rehabilitating pipe 3, the strip-shaped member 10 is wound in a spiral shape, and the concave-convex fitting portions 13, 14 of adjacent wound portions are fitted together. An outer circumferential groove 16 is formed in a spiral shape on the outer circumferential surface of the rehabilitating pipe 3. The cross-sectional shape of the belt-shaped member 10 is not limited to that shown in FIG. 2, and can be modified as appropriate.

[0021] As shown in Figure 1(a), a pipe making device 20 is provided at the pipe end 3e on the tip side (left side in Figure 1(a), hereinafter appropriately referred to as the "extension tip side") of the stretching direction along the pipe axis of a rehabilitating pipe 3 (previously produced pipe portion 3a) during pipe making. A subsequent belt portion 19 of the unmade pipe in the belt-shaped member 10 is introduced into the pipe making device 20 from the rear side in the stretching direction (right side in Figure 1(a), hereinafter referred to as the "stretching rear side") through the inside of the pipe portion 3a. The pipe making of the rehabilitating pipe 3 progresses as the pipe making device 20 incorporates the subsequent belt portion 19 into the pipe end portion 3e.

[0022] As shown in Figure 3, the pipe making apparatus 20 is a self-propelled pipe making apparatus that performs pipe making while being propelled clockwise in Figure 3 along the spiral winding direction. Furthermore, as shown in Figure 1, the pipe making apparatus 20 is capable of being transformed between an inner circumference release form (Figures 1(a) and (c)) in which pipe making is performed with the pipe end 3e released to the inner circumference side, and an inner circumference restriction form (Figure 1(b)) in which pipe making is performed with the pipe end 3e restricted from the inner circumference side. Hereinafter, the pipe making apparatus 20 in the inner circumference release form will be referred to as "pipe making apparatus 20A," and the pipe making apparatus 20 in the inner circumference restriction form will be referred to as "pipe making apparatus 20B."

[0023] <Inner circumference release form> As shown in FIG. 3, the pipe making device 20A includes a non-circular device body 21 and an outer circumference restricting wire 53. The device body 21 is arranged so as to be capable of being advanced in the spiral winding direction on the inner circumferential side of one location of the pipe end 3e in the circumferential direction. The longitudinal direction LD of the device body 21 and thus the pipe making device 20A is oriented in the spiral winding direction, i.e., the advancing direction, of the rehabilitating pipe 3. As shown in FIG. 1(a), the width direction WD perpendicular to the longitudinal direction LD of the pipe making device 20A is roughly along the extension direction or pipe axis of the rehabilitating pipe 3, and strictly speaking is inclined by the lead angle of the spiral with respect to the pipe axis of the rehabilitating pipe 3. The longitudinal dimension of the pipe making device 20A is sufficiently shorter than the circumferential length of the pipe end 3e, and the pipe end 3e other than the location where the pipe making device 20A is arranged is open to the inner circumferential side.

[0024] As shown in Fig. 4, the main body 21 of the pipe making apparatus 20A is provided with a drive unit 22, a front thrust unit 23, and a rear thrust unit 24. The drive unit 22 is provided in the center of the main body 21. The drive unit 22 includes at least one pair (two pairs in the figure) of drive rollers 22a, 22b. The axes of these drive rollers 22a, 22b are oriented in the width direction WD (perpendicular to the paper surface in Fig. 4) of the pipe making apparatus 20A. When driven to rotate by the drive motor 22c, the drive rollers 22a, 22b clamp the trailing belt portion 19 of the unmade pipe in the belt-shaped member 10, and send it out obliquely to the rear side in the thrust direction (the right side in Fig. 4, hereinafter referred to as "rear thrust") and push it into the pipe end 3e.

[0025] As shown in Fig. 4, a rear push arm 25 extends rearward (to the right in Fig. 4) from the drive unit 22. A pressure roller 26 is provided on the rear push arm 25 via a support portion 27. The axis of the pressure roller 26 is oriented in the width direction WD perpendicular to the paper surface of Fig. 4. The pressure roller 26 presses the trailing belt portion 19 or the tube end portion 3e from the inner peripheral side.

[0026] As shown in Fig. 4, the rear thrust unit 24 is connected to the rear thrust side (right side in Fig. 4) of the rear thrust arm 25. The rear thrust unit 24 is provided with a rear thrust tube end guide 33. Although not shown in detail, the rear thrust tube end guide 33 is provided with a locking portion that is locked in the outer circumferential groove 16 of the tube end 3e so as to be slidable in the spiral winding direction.

[0027] As shown in FIG. 4, the bottom of the drive unit 22 is provided with an intermediate tube end guide 32 having a similar stop.

[0028] As shown in Fig. 4, the front propulsion unit 23 is provided on the front side in the propulsion direction of the drive unit 22 (the left side in Fig. 4, hereinafter referred to as "front propulsion"). The front propulsion unit 23 includes a connecting plate 28 and a front propulsion unit body 29. The connecting plate 28 extends from the bottom of the drive unit 22 in the propulsion forward direction. The unit body 29 is provided at the tip of the connecting plate 28.

[0029] As shown in Figures 5 and 6, the forward propulsion unit body 29 includes a unit body portion 29a having a rectangular frame or block shape, and a connecting plate portion 29b. The connecting plate portion 29b is connected to the connecting plate 28 by bolts (not shown) or the like. The unit body portion 29a is connected to the forward propulsion end portion (the left end in Figure 6) of the connecting plate portion 29b, and is disposed adjacent to the inner circumferential surface of the pipe end portion 3e. Four (plural) bolt holes 29d for the connecting member 60 described below are formed in the four corners of the upper plate 29c of the unit body portion 29a.

[0030] As shown in Figures 5 and 6, the forward pipe end guide 30 and the brake mechanism 40 are incorporated in the unit body 29a. As shown in Figure 5, the forward pipe end guide 30 has an L-shaped guide block 31 and a locking portion 34. The bottom portion 31b of the guide block 31 is disposed on the outer periphery of the pipe end 3e. The locking portion 34 is provided at the tip of the bottom portion 31b. The locking portion 34 is locked in the outer periphery groove 16 of the pipe end 3e so as to be slidable in the spiral winding direction. Therefore, in the device body 21, three (plural) tube end guides 30, 32, 33 are arranged apart from each other in the longitudinal direction LD.

[0031] As shown in Figs. 5 and 6, the brake mechanism 40 of the forward propulsion unit 23 includes a brake shaft 41, a lever attachment portion 42, and a brake shoe 43. The brake shaft 41 is rotatably held by the unit body portion 29a. The axis of the brake shaft 41 is oriented in the width direction WD. The brake shaft 41 penetrates the vertical piece portion 31a of the guide block 31 and the unit body 29, and extends from the unit body 29 to the extended tip side (the left side in Fig. 5, and the lower side in Fig. 6). A lever attachment portion 42 is provided at the end of the extended tip side of the brake shaft 41. As shown by the two-dot chain line in Fig. 6, a brake lever 44 is detachably attached to the lever attachment portion 42 and can be rotated.

[0032] As shown in Figs. 5 and 6, a brake shoe 43 is provided at the end of the brake shaft 41 on the extended rear side (the right side in Fig. 5, the upper side in Fig. 6). The brake shoe 43 faces the locking portion 34 across the tube end 3e. As shown in Fig. 4, the brake shoe 43 is formed in a cylindrical shape that is eccentric with respect to the brake shaft 41. As shown in Fig. 5, the outer peripheral surface of the brake shoe 43 is closely spaced from or in contact with the inner peripheral surface of the tube end 3e. When the brake shoe 43 is in contact with the tube end 3e, the pipe making device 20A is advanced, so that a sliding friction resistance (braking force) is applied between the tube end 3e and the brake shoe 43. The pressing force of the brake shoe 43, and therefore the braking force, is adjusted according to the rotation angle of the brake shaft 41. This allows the pipe diameter of the tube end 3e to be expanded or reduced by increasing or decreasing the advancing speed of the pipe making device 20A relative to the feed speed of the trailing belt portion 19.

[0033] 4, the front propulsion unit 23 is further provided with attachment parts 51, 52. The first attachment part 51 includes a through hole 51a formed in the bottom side part 31b of the guide block 31, a folded-back hole 51b formed in the connecting plate 28, and a wire end insertion hole 51c formed in the unit main body part 29a. A second connecting portion 52 is integrally provided on the side surface of the extending tip side of the unit body portion 29a.

[0034] As shown in Fig. 3, the pipe making apparatus 20A in the inner circumference open form is provided with an outer circumference restricting wire 53. The outer circumference restricting wire 53 is wound around the outer circumference of the pipe end 3e in a spiral shape. As shown in Fig. 4, a first end 53a of the outer circumference restricting wire 53 is passed through the through hole 51a, passed through the turn-back hole 51b and turned back, and further inserted into the insertion hole 51c and secured by a set screw 54.

[0035] 4, the second end 53b of the outer periphery restricting wire 53 is connected to the second connecting portion 52. Depending on the length of the outer periphery restricting wire 53, the circumferential length of the tube end 3e, and therefore the tube diameter, can be adjusted.

[0036] As shown in Figure 4, the pipe making apparatus 20A is provided with connection seats for the inner circumference regulating body 70, spaced apart on the forward and rearward thrust sides in the longitudinal direction LD. Specifically, the unit main body portion 29a of the forward thrust unit 23 serves as the forward thrust connecting seat. The pressure roller support portion 27 of the rear thrust arm 25 also serves as the rearward thrust connecting seat. By connecting the corresponding connecting portions of the inner circumference regulating body 70 (Figure 9) to these forward thrust and rearward thrust connecting seats, respectively, the pipe making apparatus 20 is transformed into a pipe making apparatus 20B with an inner circumference regulating form.

[0037] <Inner circumference regulation type> As shown in Figure 9, the inner circumference regulating body 70 in the pipe making apparatus 20B with the inner circumference regulating configuration includes a link roller 71 that is spirally annular in the spiral winding direction, and a connecting attachment 72. The link roller 71 has a plurality of rollers 74 arranged at intervals in the spiral winding direction, and a frame-shaped link 73 provided between adjacent rollers 74. The axis of each roller 74 is directed in the width direction WD of the pipe making apparatus 20B (a direction perpendicular to the paper surface in Figure 9). Each roller 74 is held rotatably around its axis by the link 73, and adjacent rollers 74 are connected to each other via the link 73.

[0038] As shown in Fig. 9, the device body 21 is provided between two links 73A, 73B that are spaced apart in the spiral winding direction (propulsion direction) of the link roller 71. Of the two links 73A, 73B, the link 73B on the rear propulsion side (right side in Fig. 9) is connected to a connecting attachment 72. A tip 72a of the connecting attachment 72 facing the front propulsion side (left side in Fig. 9) constitutes a rear propulsion side connection part of the inner circumference regulating body 70. The tip 72a is rotatably and detachably connected to the pressure roller support part 27 (rear propulsion side connection seat) via a connecting shaft 75.

[0039] As shown in Fig. 10, a cylindrical connecting roller 76 is provided on the link 73A on the forward propulsion side (left side in Fig. 9). The axis of the connecting roller 76 is oriented in the width direction WD. The axial length of the connecting roller 76 is approximately half that of the roller 74. The connecting roller 76 forms a connecting portion on the forward propulsion side with the device body 20.

[0040] As shown in Fig. 10, a connection member 60 for connection with a connecting roller 76 (propulsion front side connection portion) is removably attached to the unit main body 29a (propulsion front side connection seat). As shown in Fig. 7(a), the connection member 60 includes a connection main body 61 and a connection shaft portion 62. As shown in Fig. 7(b), the connection main body 61 is formed in a generally rectangular or inverted U-shaped box shape, and is removably fitted to the outside of the unit main body 29a (Figs. 8(a) to 8(b)). As shown in Fig. 7(a), four (a plurality of) insertion holes 61b corresponding to the bolt holes 29d are formed in the four corners of the upper surface portion 61a of the connection main body 61. As shown in Fig. 8(b), the connection bolts 63 are screwed into the bolt holes 29d through the insertion holes 61b, thereby connecting the connection member 60 to the unit main body 29a.

[0041] As shown in Fig. 7(a), a connecting shaft portion 62 protrudes from the connecting body portion 61 toward the rear side (upper side in Fig. 7(a)) in the width direction WD. As shown in Fig. 10, the connecting shaft portion 62 is inserted into the center hole of the connecting roller 76 of the link 73A. This allows the link 73A to be rotatably connected to the connecting member 60.

[0042] <First mode of use> The pipe making apparatus 20 is used, for example, as follows. As shown in Figure 1(a), in the straight section 1a of the existing pipe 1, the pipe making device 20 is preferably configured as a pipe making device 20A with an inner circumference open. The pipe making device 20A is disposed at the pipe end 3e of the rehabilitating pipe 3 in the middle of pipe making. An outer circumference restricting wire 53 of the pipe making device 20A is wound around the outer circumference of the pipe end 3e. The inner circumference restricting body 70 (Figure 9) and connecting member 60 (Figure 7) have been removed.

[0043] As shown in Figure 4, the trailing band portion 19 is introduced into the pipe making apparatus 20A, sandwiched between a pair of drive rollers 22a, 22b, and pushed into the pipe end 3e. This causes the fitting portions 13, 14 of the pipe end 3e and the trailing band portion 19 to fit together (see Figure 2(b)), and the trailing band portion 19 is incorporated into the pipe end 3e, progressing the production of the rehabilitated pipe 3. The pipe making apparatus 20A is propelled forward by the reaction force generated when the trailing band portion 19 is pushed in.

[0044] Generally, this type of belt-shaped member 10 has a tendency to have a reduced diameter as the pipe making process progresses. Therefore, frictional resistance (braking force) is applied between the pipe making device 20A and the pipe end 3e by the brake mechanism 40. This makes the forward speed of the pipe making device 20A slower than the feed speed of the trailing belt portion 19 by the drive rollers 22a, 22b, preventing the diameter of the pipe end 3e from being reduced. Furthermore, as the pipe end 3e tries to expand in diameter, it sticks to the outer periphery restricting wire 53. The circumference and diameter of the pipe end 3e can be adjusted by adjusting the length of the outer periphery restricting wire 53.

[0045] With the open inner periphery type pipe making apparatus 20A, rehabilitation work can be carried out without obstructing the flow of water even while the existing pipe 1 is in service as a sewer pipe. In addition, the open inner periphery type pipe making apparatus 20A is lightweight and compact, and even if it falls over during pipe making, the impact is small and it is very safe.

[0046] As shown in Fig. 1(b), the pipe making device 20 is preferably a pipe making device 20B of an inner circumference restricted form at the curved section 1b of the existing pipe 1. That is, as shown by the two-dot chain line in Fig. 1(a), at the transition section 1c from the straight section 1a to the curved section 1b, the pipe making device 20 is transformed from an inner circumference open form to an inner circumference restricted form.

[0047] Specifically, as shown in FIGS. 8(a) and 8(b), the connection member 60 is fitted into the unit body 29 (the forward propulsion connection seat) and fixed with a connection bolt 63. 10, the connecting shaft portion 62 of the connection member 60 is inserted into the center hole of the connecting roller 76 of the link 73A. The inner circumference restricting body 70 is assembled along the inner circumference surface of the pipe end portion 3e, with the link 73A and the connecting attachment 72 serving as the starting and ending ends. This makes it possible to easily transform the pipe making apparatus 20A having an inner circumference open configuration into the pipe making apparatus 20B having an inner circumference restricted configuration. The tube end guide 30 does not need to be removed and can be left in a state where it is engaged with the tube end 3e. Therefore, the device body 21 can be prevented from becoming unstable during the transformation work.

[0048] The outer periphery restricting wire 53 does not need to be removed either, and can be left wrapped around the outer periphery of the tube end 3e. However, it is preferable to adjust the length of the outer periphery restricting wire 53 so that the outer periphery restricting wire 53 does not stick strongly to the tube end 3e. The outer periphery restricting wire 53 may be removed when transforming into the inner periphery restricting form. Regarding the brake mechanism 40, the angle of the brake shoe 43 is adjusted so that no braking force is applied to the tube end 3e.

[0049] During pipe making by the pipe making device 20B, the pipe end 3e is attached to the inner circumference regulating body 70. This allows the circumferential length and pipe diameter of the pipe end 3e to be maintained at a predetermined value even in the curved portion 1b, allowing for stable pipe making.

[0050] As shown by the two-dot chain line in FIG. 1(b), at a transition section 1d from the curved section 1b to the straight section 1a' of the existing pipe 1, the pipe making device 20 is transformed from an inner circumference restricted form to an inner circumference released form. That is, the inner circumference regulating body 70 and the connecting member 60 are separated and removed from the device main body 21. At this time, by removing the connecting bolt 63, the connecting member 60 can be easily separated from the unit main body portion 29a (the forward thrust connecting seat). Also, by removing the connecting shaft 75, the connecting attachment 72 can be easily separated from the support portion 27 (the rearward thrust connecting seat). This allows the pipe making device 20B in the inner circumference regulated form to be easily transformed into the pipe making device 20A in the inner circumference released form.

[0051] As shown in FIG. 1(c), in the straight section 1a', a rehabilitating pipe 3 is produced by a pipe producing apparatus 20B with an inner circumference restriction configuration. Since the pipe making device 20 can be easily transformed between the inner circumference release form and the inner circumference restriction form, there is no need to prepare two dedicated pipe making devices, i.e., one dedicated to the inner circumference release form and one dedicated to the inner circumference restriction form, and to make pipes by switching between these two dedicated pipe making devices.

[0052] <Second mode of use> As shown in FIG. 12(d), when pipe making is performed in an inner circumference restricted manner from near the starting pipe mouth 1e of the existing pipe 1, the rehabilitating pipe 3 can be unwound as follows using the pipe making device 20. For unwinding, an unwinding jig 80 is prepared. As shown in Fig. 11, the unwinding jig 80 includes a jig body 81 and multiple gripping portions 82. The jig body 81 is formed in an annular shape with a size that matches the pipe diameter of the rehabilitating pipe to be produced. Multiple gripping portions 82 are provided at intervals in the circumferential direction of the jig body 81. Each gripping portion 82 has a pair of clamping members 83, and protrudes from the jig body 81 in the pipe axial direction of the existing pipe 1 (a direction perpendicular to the paper surface in Fig. 11).

[0053] 12(a), first, the belt-shaped member 10 is manually wound in a spiral shape one or more times along the circumferential direction of the unwinding jig 80, and the fitting parts 13, 14 that are one turn apart are fitted together to create the unwinding ring 3f. The unwinding ring 3f is clamped and held from the inner and outer circumferential sides by a pair of clamping members 83 of the gripping parts 82 at each position in the circumferential direction of the unwinding jig 80.

[0054] As shown in Figure 12(b), next, the pipe making device 20 is attached to the unwinding ring 3f in an inner circumference open form. That is, at this stage, the inner circumference regulating body 70 (Figure 9) is not yet installed. The edge portion on the starting end side in the extension direction of the unwinding ring 3f is maintained in shape by the unwinding jig 80. The unwinding work up to this point may be carried out in the starting manhole 4 (Figure 12(c)) connected to the starting pipe port 1e, or may be carried out on the ground.

[0055] As shown in FIG. 12(c), the unwinding ring 3f thus produced is brought into contact with the starting pipe opening 1e from the starting manhole 4 while its shape is maintained by the unwinding jig 80. Next, the pipe making device 20A is driven to make one to several turns of the rehabilitated pipe 3 following the unwinding ring 3f. As shown in FIG. 13, at this stage, the inner circumference regulating body 70 shown by the imaginary line in the figure has not yet been installed, so there is no interference between the clamping member 83 on the inner circumference side of the gripping portion 82 and the inner circumference regulating body 70. In other words, in the area where the inner circumference regulating body 70 would interfere with the unwinding jig 80 if it were in the inner circumference regulating form, the pipe making device 20 is put into the inner circumference release form, so that interference can be avoided and pipe can be made while maintaining the shape of the unwinding ring 3f by the unwinding jig 80.

[0056] Preferably, during the unwinding pipe making process, a braking force is applied between the pipe making device 20A and the pipe end 3e by the brake mechanism 40. This makes it possible to prevent the pipe diameter from being reduced.

[0057] In this manner, the pipe making apparatus 20A in the inner circumference open form is advanced to an area where the inner circumference regulating body 70 does not interfere with the unwinding jig 80. As shown in Figure 12 (d), at this stage, the pipe making apparatus 20 is stopped once and transformed from the inner circumference release form to the inner circumference restricted form. That is, the bearing roller 73c (forward thrust connection part) of the link 73A is connected to the unit body 29 (forward thrust connection seat) via the connection member 60. Also, the tip 72a (rear thrust connection part) of the connecting attachment 72 is connected to the support part 27 (rear thrust connection seat). With the link 73A and the connecting attachment 72 as the starting or ending ends, the inner circumference restricting body 70 is constructed along the inner surface of the pipe end 3e.

[0058] When transforming into the inner circumference restricted form, the holding state by the unwinding jig 80 is maintained as it is. In this state, the rehabilitated pipe 3 is produced into a pipe by the pipe producing device 20B for a few more turns. At this time, because the edge portion at the starting end side in the extension direction of the rehabilitated pipe 3 is held by the unwinding jig 80, even if the rigidity of the rehabilitated pipe 3 is low, it is possible to prevent the rehabilitated pipe 3 from being deformed and flattened by its own weight. Even if the axial length of the rehabilitated pipe 3 is still short, it is possible to prevent the rehabilitated pipe 3 and the pipe producing device 20B from becoming unstable, and a stable pipe can be produced.

[0059] After the rehabilitated pipe 3 has been manufactured to an axial length that is sufficiently stable, the unwinding jig 80 is removed. In this manner, a pipe can be produced from the vicinity of the starting pipe opening 1e of the existing pipe 1 by the pipe producing device 20B with inner circumference restriction.

[0060] The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the connecting member 60 may be omitted. The forward thrust connecting portion of the inner circumference regulating body and the forward thrust connecting seat of the device main body may be directly connected. The propulsion front side connecting seat of the propulsion front unit 23 is not limited to the unit main body portion 29a as long as it has a structure that can be connected to the propulsion front side connecting portion of the inner circumference regulating body 70. The forward thrust connection portion of the inner circumference regulating body 70 is not limited to the connecting roller 76 as long as it has a structure that allows it to be connected to the forward thrust connection seat of the forward thrust unit 23 . The rear-side connecting seat of the device body 21 is not limited to the pressure roller support portion 27 as long as it has a structure that can be connected to the rear-side connecting portion of the inner circumference regulating body 70 . The rearward thrust connection portion of the inner circumference regulating body 70 is not limited to the tip portion 72 a of the connecting attachment 72 , so long as it has a structure that allows it to be connected to the rearward thrust connection seat of the device main body 21 . In a pipe making apparatus with an inner circumference open configuration, the outer circumference restricting wire 53 may be omitted. The present invention can also be applied to the production of helical pipes other than the rehabilitating pipe 3. [Industrial Applicability]

[0061] The present invention is applicable, for example, to a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0062] 1 Existing pipes 1a,1a' Straight section 1b Curved section 1c,1d Transition 1e Starting pipe port 3 Rehabilitation pipe (spiral pipe) 3a Previously manufactured pipe section 3e Tube end on the extension tip side 3f Winding ring 10 Belt-shaped member 13,14 Concave-convex fitting part 16 Outer Circumferential Groove 19 Trailing Belt 20 Pipe making equipment 20A Inner circumference open type pipe making equipment 20B Inner circumference controlled pipe making equipment 21 Device body 22 Drive unit 23 Propulsion forward unit 24 Propulsion rear unit 26 Presser roller 27 Presser roller support part (rear thrust connection seat) 29 Unit body 29a Unit body (forward propulsion connection seat) 30 Propulsion front pipe end guide (pipe end guide) 32 Intermediate pipe end guide (pipe end guide) 33 Push rear pipe end guide (pipe end guide) 34 Locking part 40 Brake Mechanism 41 Brake shaft 43 Brake shoe 51 First connection part 52 Second connection part 53 Periphery control wire 53a First end 53b Second end 60 Connection member 61 Connection body 62 Connecting shaft part 63 Connection bolt 70 Inner circumference regulation body 71 Link Roller 72 Connecting attachment 72a Tip (rear thrust connection) 73 Links 73A Propulsion front connecting link 73B Propulsion rear connecting link 75 Connecting shaft 76 Connecting roller (front connection part for propulsion) 80 Unwinding jig 81 Jig body 82 Gripping part 83 Clamping member

Claims

1. A pipe making device that can be transformed between an inner circumference release mode in which the pipe making is performed while the pipe end portion at the tip side in the extension direction along the pipe axis of the helical pipe being made is released toward the inner circumference side and the pipe is made while being propelled in the helical winding direction, and an inner circumference restriction mode in which the pipe making is performed while the pipe end portion is restricted from the inner circumference side by a helical annular inner circumference restricting body and the pipe is made while being propelled in the helical winding direction, A non-annular device body is disposed so as to be axially advanced at one location of the tube end with a longitudinal direction facing the advancement direction along the spiral winding direction; At least one pair of drive rollers are provided in the device body and configured to pinch a subsequent band portion of the unfinished pipe in the band-shaped member that will become the helical pipe and push it into the pipe end portion; a plurality of tube end guides each having a locking portion that is slidably locked to an outer circumferential groove formed in the belt-shaped member that constitutes the tube end, the tube end guides being spaced apart from one another in the longitudinal direction of the device body; a brake mechanism that constitutes a forward propulsion unit provided at a forward propulsion portion of the device body among the plurality of tube end guides and applies frictional resistance between the tube end and the brake mechanism during the propulsion; a forward propulsion side connecting seat provided in the forward propulsion unit and adapted to detachably connect the forward propulsion side connecting portion of the inner circumference regulating body; a rear-side connecting seat provided in a rear portion of the device body and configured to detachably connect the rear-side connecting portion of the inner periphery regulating body; A pipe making apparatus comprising:

2. A connecting member that is detachable from the propulsion front connecting seat is further provided, A pipe making apparatus as described in claim 1 , wherein the forward connection portion of the inner circumference regulating body is connected to the forward connection seat via the connecting member.

3. A pipe making apparatus as described in claim 2, wherein the connecting member has a connecting main body portion that engages with the thrust front side connecting seat and a connecting shaft portion that protrudes from the connecting main body portion in a direction perpendicular to the thrust direction, and the thrust front side connecting portion is rotatably connected to the connecting shaft portion.

4. A pipe making apparatus as described in claim 1, wherein the forward propulsion unit is provided with two connection portions to which both ends of an outer periphery regulating wire which is wound around the outer periphery of the pipe end in the inner periphery release form is respectively connected.

5. A method for unwinding a pipe using the pipe producing apparatus according to any one of claims 1 to 4, a winding ring is prepared by winding the belt-shaped member in a spiral shape once or more, and the pipe making device in the inner circumference open form is attached to the winding ring; While the edge portion of the unwinding ring at the start end side in the extension direction is maintained in shape by an annular unwinding jig, a spiral tube is produced by the tube producing device in several turns. Next, the inner circumferential regulating body is installed along the inner circumferential surface of the spiral tube, and the forward thrust side connecting portion of the inner circumferential regulating body is connected to the forward thrust side connecting seat, and the rearward thrust side connecting portion of the inner circumferential regulating body is connected to the rearward thrust side connecting seat; Thereafter, the unwinding jig is removed.

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