Pipe manufacturing auxiliary device and pipe manufacturing auxiliary method

Abstract

To obtain curvature to a regeneration pipe along a curved pipeline without imposing a large load on an outer peripheral side machine element of a pipe-production machine.SOLUTION: There is provided an auxiliary method for pipe-production. The method comprises: pipe-producing a helical regeneration pipe 3 along an inner periphery of an existing pipe 1 by using a pipe-production machine 8; in a curved pipe line 2 of the existing pipe 1, installing a pipe-production auxiliary device 10 away from the pipe-production machine 8 to a rear in an extension direction; arranging bellows width adjusting jigs 20 and 30 on the inner peripheral surfaces of the outer peripheral side and the inner peripheral side of the regeneration pipe 3; engaging engaging-claws 42 and 38 of the bellows width adjusting jigs 20 and 30 with bellows 7 of a belt-like member 4 constituting the regeneration pipe 3; and moving the engaging-claws 42 and 38 in the extension direction by using an operating mechanism 50.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a pipe manufacturing auxiliary device and a pipe manufacturing auxiliary method used in manufacturing spiral pipes such as rehabilitating pipes along the inner surface of pipelines such as deteriorated existing pipes, and in particular to a pipe manufacturing auxiliary device and a pipe manufacturing auxiliary method applicable to manufacturing pipes in curved pipelines. [Background technology]

[0002] A method of rehabilitating an existing pipe, such as an aged sewer pipe, by lining the inner peripheral surface of the existing pipe with a rehabilitation pipe is known. A known rehabilitation pipe is one in which a belt-shaped member is manufactured into a spiral pipe shape using a pipe-making machine. A known belt-shaped member has bellows whose width can be expanded or contracted. By using a belt-shaped member with bellows, the bellows can be expanded on the outer side of the curved pipe of the existing pipe and contracted on the inner side, thereby manufacturing a pipe that fits the curve.

[0003] Furthermore, a self-propelled pipe making machine that produces a helical rehabilitating pipe while self-propelling inside an existing pipe is known. Conventional self-propelled pipe making machines include a pair of pinch rollers consisting of an outer roller and an inner roller (see Patent Document 1, etc.). Opposing edges of a spirally wound strip-shaped material one revolution apart are sandwiched and fitted together by the pair of pinch rollers. The outer roller is rolled in contact with the inner surface of the existing pipe, so that the pipe making machine is propelled (self-propelled) in the helical winding direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-132629 A Summary of the Invention [Problem to be solved by the invention]

[0005] When this type of self-propelled pipe making machine is used to make a rehabilitated pipe in a curved pipeline of an existing pipe, an outer peripheral side mechanical element such as an outer roller arranged on the outer peripheral side of the rehabilitating pipe comes into contact with the inner peripheral surface of the existing pipe, generating a moment that causes the pipe making machine to face the existing pipe, thereby expanding or contracting the bellows in the rehabilitating pipe behind the pipe making machine. This makes the rehabilitated pipe bend along the curved pipeline. Therefore, in order to make a pipe in a curved pipeline, an outer peripheral side mechanical element such as an outer roller is necessary, and the outer peripheral side mechanical element must be able to bear the load when expanding and contracting the bellows. If the outer peripheral side mechanical element is made larger, the gap between the existing pipe and the rehabilitating pipe must be made larger, making it difficult to make a pipe by attaching the rehabilitating pipe to the inner peripheral surface of the existing pipe. In consideration of the above circumstances, the present invention aims to make it possible to reliably impart curvature to a rehabilitated pipe along a curved pipeline of an existing pipe without placing a large load on the outer peripheral mechanical elements of the pipe making machine, or even when the outer peripheral mechanical elements are small or the pipe is made using a pipe making machine that has no outer peripheral mechanical elements. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a pipe manufacturing auxiliary device that assists in manufacturing a spiral rehabilitating pipe at a curved pipe of an existing pipe in a pipe manufacturing method in which a rehabilitating pipe is manufactured along the inner circumference of an existing pipe, the pipe being made of a belt-shaped member of a constant cross section having a bellows that is expandable and contractable in the belt width direction, the pipe manufacturing auxiliary device comprising: A bellows width adjustment jig is provided at a front end of the rehabilitating pipe in the extension direction along the pipe axis, away from the pipe manufacturing machine that performs the pipe manufacturing, and is disposed on the inner periphery of the rehabilitating pipe at least on one of the outer periphery side and the inner periphery side of the curved pipe, A jig frame arranged with a machine direction aligned with the stretching direction; a slide frame slidably attached to the jig frame in the machine direction; an engagement claw provided on at least the slide frame of the slide frame and the jig frame, the engagement claw being engaged with the bellows; an actuation mechanism for moving the slide frame in the machine direction relative to the fixture frame; The present invention is characterized in that it has the following features.

[0007] For example, a pipe making machine is advanced in a spiral winding direction along the inner circumference of an existing pipe such as an aged sewer pipe, while a rehabilitated pipe is made behind the pipe making machine. As the pipe making machine advances, the rehabilitated pipe is extended forward in the extension direction along the pipe axis (hereinafter referred to as "extension forward"). When making a rehabilitated pipe for a curved pipeline, the pipe making auxiliary device is prepared separately from the pipe making machine. The bellows width adjustment jig of the pipe making auxiliary device is placed on the inner circumferential surface of the rehabilitated pipe 3 at least on one of the outer circumference side and the inner circumference side of the curved pipeline 2, away from the pipe making machine backward in the extension direction (hereinafter referred to as "extension rearward"). The engaging claw of the bellows width adjustment jig is engaged with the bellows of the band-shaped member constituting the rehabilitated pipe. The engaging claw is moved along the machine direction, i.e., the extension direction, of the jig frame by an operating mechanism. This allows the bellows to be expanded or contracted. Preferably, in the bellows width adjustment jig on the outer circumferential side, the engaging claw is moved in a direction in which the bellows is expanded, and in the bellows width adjustment jig on the inner circumferential side, the engaging claw is moved in a direction in which the bellows is contracted. As a result, a curvature can be imparted to the rehabilitating pipe in accordance with the bend of the curved pipeline. Since the bellows is expanded and contracted by a pipe-making auxiliary device separate from the pipe-making machine to give the rehabilitated pipe a curvature, there is no need to apply a load such as a moment to the outer peripheral mechanical element of the pipe-making machine to expand and contract the bellows. The pipe-making machine can be used to make curved pipes even if the outer peripheral mechanical element is small or there is no outer peripheral mechanical element. Therefore, it is also possible to make pipe by attaching the rehabilitated pipe to the inner circumference of the curved pipeline.

[0008] The bellows width adjustment jigs are disposed on the outer circumferential side portion and the inner circumferential side portion, respectively; It is preferable that the pipe making auxiliary device further comprises a jig connecting member extending in the pipe radial direction so as to connect these bellows width adjustment jigs, and a tensioning means for tensioning the jig connecting member in the extension direction. This allows the bellows to be expanded on the outer circumferential side and contracted on the inner circumferential side, thereby making it possible to reliably accommodate curved pipelines with sharp curvatures. By connecting the bellows width adjustment jigs on both sides with a jig connecting member and tensioning the jig connecting member with a tensioning means, each bellows width adjustment jig can be pressed against the rehabilitating pipe, thereby obtaining a reaction force to the operating force that expands and contracts the bellows.

[0009] At the outer peripheral side portion, the jig frame spans a plurality of pitch portions of the rehabilitating pipe, the slide frames are disposed at a plurality of locations corresponding to the pitch portions, and the engaging claws are provided on each slide frame, It is preferable that the operating mechanism starts to move the slide frames toward one end in the machine direction of the jig frame in the order of proximity to the one end. Each of the plurality of engaging claws engages with the bellows at a corresponding pitch portion of the helical tube. These engaging claws are actuated by an actuating mechanism in order of proximity to one end in the machine direction, so that the bellows are widened in sequence with a time lag starting from the side closest to the one end. By providing a time difference, it is not necessary to make the moving speeds of the multiple engaging claws different from each other, and it is possible to avoid a complicated configuration of the operating mechanism.Incidentally, if the bellows of multiple pitch portions are configured to be expanded simultaneously, the bellows closer to one end in the machine direction is displaced forward in the extension at a speed equal to the sum of the total expansion amounts of the bellows arranged on the opposite side to the one end, so the moving speed of the engaging claw closer to the one end in the machine direction must be faster, which makes the configuration of the operating mechanism more complicated.

[0010] the actuating mechanism includes an actuating member extending in the machine direction, a plurality of locking portions spaced apart in the longitudinal direction of the actuating member and each of which is separably locked to a corresponding slide frame, and a power source that moves the actuating member in the machine direction; It is preferable that the distance between the locking portions is wider than the helical pitch of the rehabilitating pipe when the bellows is not expanded or contracted. When the operating member is moved, for example, toward the pipe making machine, i.e., in the forward direction, by driving the power source, the locking portions come into contact with the corresponding engaging claws in sequence, starting from the one closest to the front end in the stretching direction, and begin to push the engaging claws in the forward direction in the stretching direction, thereby allowing the bellows to be expanded in the forward direction in sequence, starting from the one closest to the front end in the stretching direction. In addition, the configuration of the operating mechanism can be simplified. The difference between the distance between the engaging portions and the pitch of the rehabilitating pipe before it is widened is the amount by which each bellows can be widened.

[0011] At the inner side portion, it is preferable that the jig frame spans multiple pitch portions of the rehabilitation pipe, the slide frame is arranged on one end side of the jig frame in the machine direction, and the engaging claws are respectively provided on the slide frame and the other end side of the jig frame in the machine direction. The operating mechanism moves the engagement claws at both ends of the jig frame in a direction in which they approach each other, thereby uniformly compressing one or more bellows between the engagement claws.

[0012] The present invention relates to a pipe manufacturing method for manufacturing a spiral-shaped rehabilitation pipe, which is made of a belt-shaped member having a constant cross section and a bellows that is expandable and contractable in the belt width direction, along the inner circumference of an existing pipe, and is an auxiliary pipe manufacturing method for assisting in the manufacturing of a curved pipe of the existing pipe, a step of disposing a bellows width adjustment jig on the inner peripheral surface of the rehabilitating pipe at at least one of the outer peripheral side portion and the inner peripheral side portion of the curved pipe, at a front end portion in the extension direction along the pipe axis of the rehabilitating pipe, away from the pipe manufacturing machine performing the pipe manufacturing, toward the rear of the extension direction; a step of engaging an engagement claw of the bellows width adjustment jig with a bellows of a belt-shaped member constituting the rehabilitating pipe; moving the engaging claw along the extension direction by an actuation mechanism of the bellows width adjustment jig; The present invention is characterized by comprising: According to this pipe making assistance method, the engaging claws push the bellows on the outer or inner side of the curved pipeline in the extension direction, thereby expanding or contracting the bellows. As a result, a curvature can be imparted to the rehabilitated pipe in accordance with the bend of the curved pipeline. Effect of the Invention

[0013] According to the present invention, a curvature can be imparted to the rehabilitated pipe by expanding and contracting the bellows using a device or tool separate from the pipe making machine. Therefore, a large load is not placed on the outer circumferential mechanical elements of the pipe making machine. This method can be applied to pipe making at curved pipe sections even if the outer circumferential mechanical elements are small or the pipe making machine does not have any outer circumferential mechanical elements at all. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a plan cross-sectional view showing a pipe making auxiliary device according to one embodiment of the present invention in a state in which the device is being installed on a curved pipe of an existing pipe. [Diagram 2] FIG. 2 is a front view showing the pipe making auxiliary device in the installed state. [Diagram 3] FIG. 3 is a plan cross-sectional view showing the bellows width adjusting jig of the pipe making auxiliary device in the outer periphery of the curved pipe shown in the circular area III of FIG. 1, in a state prior to operation. [Figure 4] FIG. 4 is a plan cross-sectional view showing the bellows width adjusting jig of the pipe making auxiliary device in the inner periphery of the curved pipe shown in the circle IV of FIG. 1, in a state prior to operation. [Diagram 5] Fig. 5(a) is a cross-sectional view showing the band-shaped member constituting the rehabilitating pipe lining the inner periphery of the existing pipe with the bellows in a neutral state (non-expanded / contracted state). Fig. 5(b) is a cross-sectional view showing the band-shaped member constituting the rehabilitating pipe lining the inner periphery of the existing pipe with the bellows in an expanded state. Fig. 5(c) is a cross-sectional view showing the band-shaped member constituting the rehabilitating pipe lining the inner periphery of the existing pipe with the bellows in a contracted state. [Figure 6] 6(a) to 6(c) are plan sectional views sequentially showing the operating states of the bellows width adjusting jig for the outer circumferential portion. [Figure 7] FIG. 7 is a plan sectional view showing an operating state of the bellows width adjusting jig for the inner peripheral portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

[0016] Fig. 1 shows how to rehabilitate an aged existing pipe 1 (pipeline) having a bent pipe section 2. The existing pipe 1 is, for example, a sewerage pipe buried underground. Note that the existing pipe 1 is not limited to a sewerage pipe, and may be a water supply pipe, an agricultural irrigation pipe, a hydroelectric power generation water pipe, a gas pipe, or a tunnel.

[0017] As shown in FIG. 1, the existing pipe 1 is rehabilitated by lining the inner peripheral surface of the existing pipe 1 with a rehabilitation pipe 3 (helical pipe). The rehabilitation pipe 3 is composed of a belt-shaped member 4. As shown in FIG. 5(a), the belt-shaped member 4 has a belt body 5 made of synthetic resin such as polyvinyl chloride and a steel reinforcing belt 6. The belt body 5 is formed with a certain irregular cross section, and at both ends in the belt width direction, concave and convex fitting portions 5a, 5b are formed, respectively. Furthermore, a bellows 7 is formed on the belt body 5. The bellows 7 is formed with a U-shaped cross section, for example, so that it bulges outward and is concave when viewed from the inner peripheral side. As shown in FIG. 5(b) and FIG. 5(c), the belt-shaped member 4 can be expanded and contracted in the belt width direction.

[0018] As shown in Fig. 3, a belt-shaped member 4 is wound helically around the inner peripheral surface of an existing pipe 1 while fitting portions 5a, 5b that are one turn apart are fitted together to produce a helical rehabilitating pipe 3. The rehabilitating pipe 3 extends along the axis of the existing pipe 1. As shown in Figs. 1 and 2, a self-propelled pipe making machine 8 is disposed at the front end 3e in the extension direction of the rehabilitating pipe 3 during pipe making. The pipe is made by the pipe making machine 8. The pipe making machine 8 is propelled (self-propelled) along the helical winding direction while making the pipe.

[0019] As shown by the two-dot chain line in Figure 2, the pipe making machine 8 has a pair of drive rollers 8a, 8b. These drive rollers 8a, 8b are arranged at a distance from each other on the inner periphery side of the rehabilitating pipe 3. The strip-shaped member 4 before being incorporated into the rehabilitating pipe 3 is clamped by the drive rollers 8a, 8b and pushed obliquely toward the rehabilitating pipe 3, and the fitting operation with the front end portion 3e of the rehabilitating pipe 3 is performed. In other words, the pipe making machine 8 does not have an outer roller as an outer periphery side mechanical element arranged on the outer periphery side of the rehabilitating pipe 3.

[0020] As shown in Figure 1, when producing a rehabilitated pipe 3 at a curved pipe section 2 of an existing pipe 1, in addition to a pipe making machine 8, a pipe making auxiliary device 10 is used. The pipe making auxiliary device 10 is located inside the rehabilitating pipe 3, slightly behind the pipe making machine 8 in the extension direction (hereinafter referred to as "rear of extension"). The pipe making auxiliary device 10 assists the pipe making machine 8 in producing pipe at the curved pipeline 2.

[0021] As shown in Figure 2, the pipe manufacturing auxiliary device 10 comprises a stand 11 and two bellows width adjustment jigs 20, 30. The stand 11 includes a pedestal 12 and a jig connecting member 13. The pedestal 12 is constructed along the inner circumference from the outer side portion 3a of the rehabilitating pipe 3, passing through the bottom and reaching the inner side portion 3b. The pedestal 12 is provided with casters 14, allowing it to move in the axial direction (extension direction) of the rehabilitating pipe 3. The jig connecting member 13 extends in the pipe diameter direction so as to connect the outer side portion 3a and the inner side portion 3b of the rehabilitating pipe 3. Both ends of the jig connecting member 13 are supported by the pedestal 12.

[0022] As shown in Fig. 2, a bellows width adjustment jig for width expansion 20 is connected to the end of the jig connecting member 13 on the outer side (left side in the figure) via an outer side hydraulic cylinder 15 (bracing means). A bellows width adjustment jig for width contraction 30 is connected to the end of the jig connecting member 13 on the inner side (right side in the figure) via an inner side hydraulic cylinder 16 (bracing means). The bellows width adjustment jigs 20, 30 on both sides are connected to each other by the jig connecting member 13. The jig connecting member 13 is braced in the extension direction by the operation of the hydraulic cylinders 15, 16. As a result, the bellows width adjustment jigs 20, 30 are pressed against the inner circumference of the rehabilitating pipe 3. It is to be noted that one of the hydraulic cylinders 15, 16 may be omitted, and the jig connecting member 13 may be directly connected to the bellows width adjusting jig 20 or 30.

[0023] As shown in Fig. 3, the outer side expansion bellows width adjustment jig 20 includes a jig frame 21, multiple slide frames 40, and an operating mechanism 50. The jig frame 21 has multiple connecting shafts 22 that are parallel to each other and end plates 23, 24 at both ends. The longitudinal direction of the connecting shafts 22, i.e., the longitudinal direction (machine direction) of the jig frame 21, is oriented in the extension direction of the rehabilitating pipe 3. The jig frame 21 spans multiple pitch portions 3p on the extension front end side of the rehabilitating pipe 3. One pitch portion 3p refers to one turn of the spiral of the rehabilitating pipe 3.

[0024] A front end plate 23 perpendicular to the connecting shaft 22 is provided at the end of the jig frame 21 on the extended front side. A rear end plate 24 is provided at the end of the jig frame 21 on the extended rear side. The rear end plate 24 has an end wall 24a and a base plate 24b perpendicular to each other, and is formed in an L-shaped plate shape. The end wall 24a faces the front end plate 23 in the front-rear direction. The connecting shaft 22 spans between the front end plate 23 and the end wall 24a.

[0025] The base plate 24b is fitted to the inner peripheral surface of the rehabilitating pipe 3. The jig connecting member 13 is connected to the base plate 24b via the outer peripheral side hydraulic cylinder 15.

[0026] The base plate 24b is provided with a rear end engagement claw 25. The engagement claw 25 protrudes from the front end of the base plate 24b toward the rehabilitating pipe 3. The engagement claw 25 is inserted into the bellows 7 of the pitch portion 3p at the rear end of the region of the rehabilitating pipe 3 that the jig frame 21 straddles, and thereby engages with the bellows 7.

[0027] A plurality of slide frames 49 are provided within the jig frame 21. The slide frame 40 has a base plate 41 and front and rear wall plates 43, 44, and is formed in a box shape with a generally U-shaped cross section. These slide frames 40 are lined up in a row in the longitudinal direction of the jig frame 21 and connected by a connecting shaft 22A on the rehabilitation pipe 3 side. The base plate 41 is fitted to the inner peripheral surface of the rehabilitation pipe 3. The connecting shaft 22A penetrates the wall plates 43, 44. Each slide frame 40 can slide in the extension direction of the connecting shaft 22 (machine direction) until it hits another adjacent slide frame 40 or the end plates 23, 24. The plurality of slide frames 40 can slide independently of each other.

[0028] The length of each slide frame 40 (the dimension along the longitudinal direction of the jig frame 21) is slightly smaller than the spiral pitch P3 (the width dimension of each pitch portion 3p) of the rehabilitating pipe 3 when the bellows 7 is not expanded or contracted. The slide frames 40 correspond one-to-one to the pitch portions 3p of the rehabilitating pipe 3. Each slide frame 40 is disposed on the inner circumferential surface of the corresponding pit portion 3p.

[0029] An engagement claw 42 is provided on the front end of a base plate 41 of each slide frame 40, which faces the inner wall of the rehabilitating pipe. The engagement claw 42 protrudes from the base plate 41 toward the rehabilitating pipe 3. The engagement claw 42 of each slide frame 40 is inserted into the bellows 7 of the corresponding pitch portion 3p of the rehabilitating pipe 3 and is engaged with the bellows 7.

[0030] A front wall panel 43A of the slide frame 40A at the extended front end protrudes further than the other slide frames 40 toward the connecting shaft 22B on the opposite side to the rehabilitating pipe 3 side.

[0031] The jig frame 21 houses an operating mechanism 50. The operating mechanism 50 includes an operating member 51 and a width-expanding hydraulic cylinder 53 (power source). The operating member 51 is formed in a long plate shape extending in the longitudinal direction of the jig frame 21. The operating member 51 is disposed closer to the connecting shaft 22B side than the slide frame 40, and spans multiple slide frames 40.

[0032] One or more locking portions 52 are provided at the longitudinal middle portion of the actuating member 51. The locking portions 52 are formed in a comb-like shape protruding from the actuating member 51 towards the rehabilitating pipe 3. Furthermore, the front end portion of the actuating member 51 constitutes a front-end locking portion 54. The multiple locking portions 52, 54 are arranged at intervals in the longitudinal direction of the actuating member 51. The interval between the locking portions 52, 54 is wider than the helical pitch P3 of the rehabilitating pipe 3 when the bellows 7 is not expanded or contracted.

[0033] These locking portions 52, 54 correspond one-to-one to the slide frames 40 and can be locked with the corresponding slide frames 40. The locking portions 52 other than the front end are inserted into the corresponding slide frames 40 and can abut (lock) against (and be separated from) the wall plate 43 of the corresponding slide frame 40 from behind. The front end locking portion 54 (front end portion of the operating member 51) corresponds to the front end slide frame 40A and abuts against (and is separable from) the wall plate 43A of the slide frame 40A. The front end locking portion 54 (the front end portion of the operating member 51) may be connected to the wall plate 43A so as not to be separated therefrom.

[0034] A power receiving plate 55 is provided at the middle of the operating member 51. The power receiving plate 55 protrudes from the operating member 51 toward the connecting shaft 22B. A width-widening hydraulic cylinder 53 is provided between the power receiving plate 55 and the rear end plate 24. When the width-widening hydraulic cylinder 53 is driven to extend and retract, the operating member 51 is moved forward and backward along the longitudinal direction (machine direction) of the jig frame 21. When the operating member 51 advances, the locking portions 52, 54 abut against the corresponding slide frame 40, causing the slide frame 40 to slide forward. As a result, the engaging claw 42 is moved in the forward direction.

[0035] As shown in Fig. 4, the inner circumference side bellows width adjustment jig 30 for width contraction includes a jig frame 31, a slide frame 32, and a width contraction hydraulic cylinder 33 (operating mechanism). The jig frame 31 has multiple connecting shafts 34 that are parallel to each other, and end plates 35, 36 on both ends. The longitudinal direction of the connecting shafts 34, i.e., the longitudinal direction (machine direction) of the jig frame 31, is oriented in the extension direction of the rehabilitating pipe 3. The jig frame 31 spans multiple pitch portions 3p on the extension front end side of the rehabilitating pipe 3.

[0036] A front end plate 35 perpendicular to the connecting shaft 34 is provided at the end of the jig frame 31 on the extended front side. A rear end plate 36 is provided at the end of the jig frame 31 on the extended rear side. The rear end plate 36 has an end wall 36a and a base plate 36b perpendicular to each other, and is formed in an L-shaped plate shape. The end wall 36a faces the front end plate 35 in the front-rear direction. The connecting shaft 34 spans between the front end plate 35 and the end wall 36a.

[0037] The base plate 36b is fitted to the inner peripheral surface of the rehabilitating pipe 3. The jig connecting member 13 is connected to the base plate 36b via the inner peripheral side hydraulic cylinder 16.

[0038] A rear end engagement claw 37 is provided on the base plate 36b (the other end of the jig frame 21 in the machine direction). The engagement claw 37 protrudes from the front end of the base plate 36b toward the rehabilitating pipe 3. The rear end engagement claw 37 is inserted into the bellows 7 of the pitch portion 3p at the rear end of the region of the rehabilitating pipe 3 that the jig frame 31 straddles, and thereby engages with the bellows 7.

[0039] A slide frame 32 is provided on the extending front side portion (one end side in the machine direction) of the jig frame 31. The slide frame 32 has a base plate 32b and an intermediate wall 32c that are perpendicular to each other, and is formed in an L-shaped plate shape. The base plate 32b is fitted to the inner peripheral surface of the rehabilitating pipe 3. A connecting shaft 34A on the rehabilitating pipe 3 side passes through the intermediate wall 32c.

[0040] A front end engagement claw 38 is provided at the front end of the base plate 32b. The engagement claw 38 protrudes from the base plate 32b toward the rehabilitating pipe 3. The engagement claw 38 is inserted into the bellows 7 at the extended front end 3e of the rehabilitating pipe 3, thereby engaging with the bellows 7.

[0041] The jig frame 31 houses a width-reducing hydraulic cylinder 33. The width-reducing hydraulic cylinder 33 is provided between the front end plate 35 and the intermediate wall 32c. When the width-reducing hydraulic cylinder 33 is driven to extend and retract, the slide frame 32 is moved forward and backward along the longitudinal direction (machine direction) of the jig frame 31. As a result, the engaging claws 38, 37 are moved closer to and away from each other.

[0042] A method for rehabilitating an existing pipe 1 such as an aged sewer pipe will be described below, focusing on a pipe manufacturing auxiliary method using the above-mentioned pipe manufacturing auxiliary device 10. As shown in Fig. 1, a belt-shaped member 4 is wound in a spiral shape around the inner circumference of an existing pipe 1 by a pipe making machine 8 to produce a rehabilitated pipe 8. The pipe making machine 8 is propelled (self-propelled) together with the pipe making, and the rehabilitated pipe 3 is extended forward. As shown in Figures 1 and 2, when performing rehabilitation work on a curved pipeline 2, generally, a moment that expands or contracts the bellows is applied to the pipe making machine while making the pipe, but in this embodiment, the rehabilitated pipe 3 is made without applying such a moment. Therefore, as shown in Figures 3 and 4, the bellows 7 at the time of pipe making is in a non-expanded or contracted state, that is, it has not been expanded or contracted.

[0043] 1 and 2, for a curved pipeline 2, a pipe making auxiliary device 10 is prepared in addition to the pipe making machine 8. The pipe making auxiliary device 10 is separated rearward from the pipe making machine 8 and placed inside the rehabilitated pipe 3 immediately after pipe making. As shown in FIG. 3, a bellows width adjusting jig 20 for widening is applied to the outer peripheral side portion 3a, and the engaging claws 25, 42 are inserted into and engaged with the unexpanded bellows 7 of the corresponding pitch portion 3p. As shown in FIG. 4, a bellows width adjusting jig 30 for contraction is applied to the inner side portion 3b, and the engaging claws 37, 38 are inserted into and engaged with the bellows 7 in the non-expanded state of the corresponding pitch portion 3p. Furthermore, the jig connecting member 13 is tensioned by the tension hydraulic cylinders 15, 16. As a result, the bellows width adjusting jigs 20, 30 on both sides are pressed against the inner circumferential surface of the rehabilitating pipe 3.

[0044] Next, the hydraulic cylinders 33 and 53 are driven. As shown in FIG. 6(a), in the bellows width adjustment jig 20 on the outer circumferential side portion 3a, the operating member 51 is slid forward (left in FIG. 6(a)) by the extension drive of the width-widening hydraulic cylinder 53. This causes the locking portion 54 at the front end of the operating member 51 to push the front end slide frame 40A forward. Accordingly, the engaging claws 42 of the slide frame 40A push and spread the bellows 7A of the pitch portion 3p1 at the extended front end forward (left in FIG. 6(a)), thereby widening the bellows 7A. By tensioning the jig connecting member 13, the base plate 24b is pressed strongly against the inner peripheral surface of the rehabilitating pipe 3. This makes it possible to obtain a reaction force to the operating force that widens the bellows 7.

[0045] As shown in Fig. 6(a), when the bellows 7A at the extended front end is expanded by a certain amount, the locking portion 52B immediately rearward of the front end locking portion 54 abuts against the wall panel 43 of the second slide frame 40B from the front end. The certain amount of expansion of the bellows 7A is equal to the difference between the distance between the locking portions 54, 52B and the helical pitch P3 (Fig. 3) in the unexpanded state.

[0046] As shown in Fig. 6(b), when the widening hydraulic cylinder 53 is further extended to slide the operating member 51 further forward, the front-end slide frame 40A is pushed further forward, and the second slide frame 40B is pushed forward in the extension direction (left in Fig. 6(b)) by the engagement with the engagement portion 52B. Accordingly, the pitch portion 3p1 at the extension front end slides forward in the extension direction while maintaining the amount of width expansion of the bellows 7A constant, and the bellows 7B at the second pitch portion 3p2 from the extension front end is pushed forward in the extension direction (left in Fig. 6(b)) and widened by the engagement claw 42 of the second slide frame 40B.

[0047] As shown in Fig. 6(b) , when the second bellows 7B is expanded by a certain amount, the locking portion 52C immediately rearward (to the right in Fig. 6(b) ) of the locking portion 52B abuts against the wall panel 43 of the third slide frame 40C from the front end. The certain amount of expansion of the bellows 7B is equal to the difference between the distance between the locking portions 52B and 52C and the helical pitch P3 in the non-expanded / contracted state.

[0048] As shown in Fig. 6(c), when the widening hydraulic cylinder 53 is further extended to slide the operating member 51 further forward, the front end and second slide frames 40A, 40B are pushed further forward in the extension direction, and the third slide frame 40C is pushed forward (left in Fig. 6(c)) by the locking portion 52C. Accordingly, the extension front end and the second pitch portion 3p1, 3p2 are slid forward in the extension direction (left in Fig. 6(c)) while keeping the width expansion amount of the bellows 7A, 7B constant, and the bellows 7C of the third pitch portion 3p3 from the extension front end is pushed forward in the extension direction and expanded by the engaging claw 42 of the third slide frame 40C.

[0049] Then, when the rear-end slide frame 40E closest to the rear end plate 24 is slid forward (to the left in Figure 6(c)) a certain amount while widening the corresponding bellows 7, the front-end slide frame 40A hits the front end plate 23, stopping the extension drive of the widening hydraulic cylinder 53.

[0050] In this way, the actuation mechanism 50 starts to move the multiple slide frames 40 toward the stretching front end (one end side) with a time lag in the order of proximity to the stretching front end (one end side in the machine direction). As a result, the bellows 7 across the multiple pitch portions 3p on the outer circumference side are each expanded by a fixed amount toward the stretching front, starting from the one closest to the stretching front end. The expansion amount of each bellows 7 is set by the distance between the adjacent locking portions 54, 52.

[0051] By providing a time difference, it is not necessary to make the moving speeds of the multiple engaging claws 42 different from one another, and the configuration of the operating mechanism 50 can be prevented from becoming complicated. Incidentally, if the bellows 7 of multiple pitch portions 3p are configured to be expanded simultaneously without providing the time difference, the moving speed of the engaging claw 42 closer to the extension front end portion 3e is required to be faster, which makes the configuration of the operating mechanism more complicated.

[0052] In addition, the required operating force can be reduced by expanding the bellows 7 at the front end side of the stretching first. Incidentally, in order to expand the bellows 7 at the rear end side of the stretching first, it is necessary to push the entire helical tube from there to the front end 3e of the stretching forward in the stretching direction, which requires a large operating force.

[0053] As shown in Fig. 7, in the bellows width adjusting jig 30 on the inner circumferential side portion 3b, the slide frame 32 is slid rearward (to the right in Fig. 7) by the extension drive of the width-contracting hydraulic cylinder 33. As a result, the front end engagement claw 38 approaches the rear end engagement claw 37, and one or more bellows 7 arranged between these engagement claws 37, 38 are contracted in width. The base plate 36b is pressed strongly against the inner peripheral surface of the rehabilitating pipe 3 by the tension of the jig connecting member 13. This makes it possible to obtain a reaction force to the operating force that causes the bellows 7 to contract in width.

[0054] In this way, by widening the bellows 7 on the outer circumferential side portion 3a and narrowing the bellows 7 on the inner circumferential side portion 3b, it is possible to impart a curvature to the rehabilitating pipe 3 in accordance with the bend of the curved pipe portion 2. By not only widening the bellows 7 on the outer circumferential side portion 3a but also narrowing the bellows 7 on the inner circumferential side portion 3b, it is possible to reliably accommodate even sharp bends. The pipe making machine 8 can be used to make the rehabilitated pipe 8 while simultaneously bending the rehabilitated pipe 3 using the pipe making auxiliary device 10. Because the bellows 7 can be expanded and contracted to bend the rehabilitated pipe 3 using the pipe making auxiliary device 10, which is separate from the pipe making machine 8, there is no need to apply a moment (load) to the pipe making machine 8 to expand and contract the bellows 7. Therefore, even if the outer circumferential mechanical element is small, or even if the pipe making machine does not have an outer circumferential mechanical element, it can be used to make the rehabilitated pipe 3 at the curved pipe section 2. The rehabilitated pipe 3 can also be made by attaching it to the inner circumference of the curved pipeline 2 of the existing pipe 1.

[0055] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, it is possible to omit one of the two bellows width adjusting jigs 20, 30. For example, it is possible to omit the bellows width adjusting jig 30 for width contraction and to configure only the bellows width adjusting jig 20 for width expansion. [Industrial Applicability]

[0056] The present invention is applicable, for example, to the rehabilitation of deteriorated sewer pipes. [Explanation of symbols]

[0057] 1 Existing pipes 2. Bend Pipe 2a Outer side 2b Inner side 3 Rehabilitation pipe (spiral pipe) 3a Outer side 3b Inner side 3e Front end in extension direction 3p pitch part P3 Spiral Pitch 4 Belt-shaped member 7 Bellows 8 Pipe making machine 10 Pipe-making auxiliary equipment 13 Jig connecting member 15 Outer hydraulic cylinder (bracing means) 16 Inner hydraulic cylinder (bracing means) 20 Bellows width adjustment tool for widening 21 Jig frame 22 Connecting shaft 30 Bellows width adjustment tool for shrinking 31 Jig frame 32 Slide Frame 33 Hydraulic cylinder for shrinking (operating mechanism) 38 Engagement claw for reducing width 40 Slide Frame 42 Engagement claw for widening 50 Operating Mechanism 51 Operating member 52 Locking part 53 Hydraulic cylinder for widening (power source) 54 Front end portion of operating member (front end locking portion) 55 Power receiving plate

Claims

1. A pipe manufacturing auxiliary device for assisting in the manufacturing of a spiral pipe at a curved pipe of an existing pipe in a pipe manufacturing method in which a rehabilitating pipe is manufactured along an inner circumference of an existing pipe, the pipe being made of a belt-shaped member of a constant cross section having a bellows that can be expanded and contracted in a belt width direction, the pipe manufacturing auxiliary device comprising: A bellows width adjustment jig is provided at a front end of the rehabilitating pipe in the extension direction along the pipe axis, away from the pipe manufacturing machine that performs the pipe manufacturing, and is disposed on the inner periphery of the rehabilitating pipe at least on one of the outer periphery side and the inner periphery side of the curved pipe, A jig frame arranged with a machine direction aligned with the stretching direction; a slide frame slidably attached to the jig frame in the machine direction; an engagement claw provided on at least the slide frame of the slide frame and the jig frame, the engagement claw being engaged with the bellows; an actuation mechanism for moving the slide frame in the machine direction relative to the fixture frame; A pipe making auxiliary device comprising:

2. The bellows width adjustment jigs are disposed on the outer circumferential side portion and the inner circumferential side portion, 2. A pipe making auxiliary device as described in claim 1, further comprising a jig connecting member extending in the pipe diameter direction to connect these bellows width adjustment jigs, and a tensioning means for tensioning the jig connecting member in the extension direction.

3. At the outer peripheral side portion, the jig frame spans a plurality of pitch portions of the rehabilitating pipe, the slide frames are disposed at a plurality of locations corresponding to the pitch portions, and the engaging claws are provided on each slide frame, 3. A pipe making auxiliary device as claimed in claim 1 or 2, characterized in that the operating mechanism starts to move the slide frames towards one end of the jig frame in the order of proximity to the one end in the machine direction.

4. the actuating mechanism includes an actuating member extending in the machine direction, a plurality of locking portions spaced apart in the longitudinal direction of the actuating member and each of which is separably locked to a corresponding slide frame, and a power source that moves the actuating member in the machine direction; 4. A pipe manufacturing auxiliary device according to claim 3, wherein the distance between said engaging portions is wider than the helical pitch of said rehabilitating pipe when said bellows is not expanded or contracted.

5. A pipe making auxiliary device as described in any one of claims 1 to 4, characterized in that, at the inner side portion, the jig frame spans multiple pitch portions of the rehabilitated pipe, the slide frame is arranged on one end side of the jig frame in the machine direction, and the engaging claws are respectively provided on the slide frame and the other end side of the jig frame in the machine direction.

6. A pipe manufacturing method for manufacturing a spiral-shaped rehabilitation pipe along an inner circumference of an existing pipe, the rehabilitation pipe being made of a belt-shaped member of a constant cross section having a bellows that can be expanded and contracted in a belt width direction, the method comprising the steps of: a step of disposing a bellows width adjustment jig on the inner peripheral surface of the rehabilitating pipe at at least one of the outer peripheral side portion and the inner peripheral side portion of the curved pipe, at a front end portion in the extension direction along the pipe axis of the rehabilitating pipe, away from the pipe manufacturing machine performing the pipe manufacturing, toward the rear of the extension direction; a step of engaging an engagement claw of the bellows width adjustment jig with a bellows of a belt-shaped member constituting the rehabilitating pipe; a step of moving the engaging claw along the extension direction by an actuation mechanism of the bellows width adjustment jig; A pipe manufacturing assistance method comprising:

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