Spiral pipe manufacturing equipment

Abstract

To apply a braking force while preventing damage to a belt-like member that constitutes a pipe end portion of a spiral pipe in a self-propelled pipe manufacturing apparatus having a brake mechanism.SOLUTION: A pipe manufacturing apparatus 10 winds a belt-like member 90 along a spiral winding direction to form a spiral pipe 9. Drive rollers 13 of a drive part 12 installed on an apparatus frame 11 of the pipe manufacturing apparatus 10 pinch a yet-to-be-manufactured portion of the belt-like member 90 to push it obliquely toward a pipe end portion 9e. A brake mechanism 20 installed on the apparatus frame 11 is rubbed against the pipe end portion 9e. An inner circumferential side surface 41 of an outer circumference brake member 40 of the brake mechanism 20 has a center surface portion 41c that faces a facing surface 31 of an inner circumference brake member 30, and a pair of overhung surface portions 41a that overhang both sides of the facing surface 31 in a propulsion direction. The center surface portion 41c recesses toward the outer circumference side with respect to the pair of overhung surface portions 41a.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a pipe making apparatus for producing a spiral pipe from a strip-shaped material, and more particularly to a so-called self-propelled pipe making apparatus that is propelled in conjunction with pipe making. [Background technology]

[0002] A known method for rehabilitating existing pipes, such as deteriorated sewer pipes, involves using a pipe-making device to spirally wind a strip-shaped member (profile) around the inner circumference of the existing pipe, and joining adjacent edges of the strip-shaped members one revolution apart using a concave-convex fit to construct a helical rehabilitated pipe (see Patent Documents 1, 2, etc.).

[0003] The pipe making device of Patent Document 1 has an annular inner circumference regulating body consisting of a link roller in which multiple links and rollers are arranged alternately and in a ring shape. The end of the pipe at the tip side in the extension direction of the made rehabilitated pipe (helical pipe) is tightly wrapped around the outer circumference of the link roller. This restricts the pipe diameter and cross-sectional shape of the pipe end from the inner circumference side. On the other hand, this inevitably results in an increase in the size of the pipe making device, which reduces the cross-sectional area of ​​running water during construction. In addition, in order to change the pipe diameter or cross-sectional shape of the rehabilitated pipe, it is necessary to adjust the circumference of the link roller or replace the entire link roller, which is a complicated process.

[0004] The pipe making device of Patent Document 2 has a non-inner circumference restricting structure that does not have an inner circumference restricting body such as a link roller. This allows the pipe making device to be made compact, and prevents the cross-sectional area of ​​the flowing water from becoming small during construction. The pipe making device of Patent Document 2 includes an equipment frame, a pair of drive rollers (propulsion reaction force applying section), and a brake mechanism (resistance force applying section). The equipment frame is disposed at the pipe end of the rehabilitated pipe (helical pipe) being made, and the drive roller and brake mechanism are provided on the equipment frame. The pair of drive rollers clamp the trailing band portion of the unmade pipe that follows the pipe end portion of the band-shaped member, and push it obliquely toward the pipe end portion. As a result, the adjacent edges of the trailing band portion and the pipe end portion are joined by a concave-convex fit, and the pipe making progresses, while the pipe making device is propelled (self-propelled) in the spiral winding direction.

[0005] The brake mechanism includes an inner brake member arranged on the inner side of the pipe end, and an outer brake member arranged on the outer side of the pipe end. The pipe end is clamped between these inner and outer brake members. This applies a braking force (frictional resistance) against the thrust to the pipe making device. The braking force can be increased or decreased by adjusting the degree of clamping by the inner and outer brake members. When the braking force is increased, the amount of the strip-shaped material fed by the pair of drive rollers becomes greater than the thrust amount of the pipe making device, and a rehabilitated pipe (helical pipe) is produced with an expanded diameter. Conversely, when the braking force is decreased, a rehabilitated pipe (helical pipe) is produced with a reduced diameter.

[0006] The outer periphery of the band-shaped member that constitutes the rehabilitating pipe is usually provided with ridges, convex strips, or ribs for engagement with the recesses. An outer periphery brake member is inserted into the groove between the ridge and the rib facing the edge of the pipe end to engage it. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication WO2008 / 075681 (Figure 4) [Patent Document 2] International Publication WO2016 / 175243 (Figure 3) Summary of the Invention [Problem to be solved by the invention]

[0008] In the pipe making device of the above-mentioned Patent Document 2, if the groove between the ridge and the rib in the band-shaped member to be made is narrow, the contact area between the outer peripheral brake member and the pipe end becomes small, which may damage the band-shaped member constituting the pipe end or cause the brake to become unstable. In addition, before and after the brake mechanism, the band-shaped member may be damaged, such as being scraped off by compression or expansion displacement. Furthermore, if the outer peripheral brake member is subjected to some external force (disturbance) and undergoes rotational or positional displacement, the band-shaped member may be damaged by a locally concentrated load. In consideration of the above circumstances, the present invention aims to provide a braking mechanism in a self-propelled pipe making apparatus having a braking mechanism that can reliably apply braking force while preventing damage to the band-shaped member that constitutes the pipe end of a spiral pipe. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention provides a pipe making apparatus for making a helical pipe by winding a strip-shaped member along a helical winding direction and joining adjacent edges of the strip-shaped member that are one turn apart, the apparatus comprising: an apparatus frame provided at a tube end portion on a tip side in a stretching direction of the helical tube being produced, the tube end portion being movable in the front-rear direction with the front-rear direction facing the winding direction; a drive unit including at least a pair of drive rollers provided on the device frame so as to be disposed inside the tube end, the drive unit clamping the unprocessed tube portion of the belt-shaped member and pushing it obliquely toward the tube end; a brake mechanism attached to the device frame and rubbing against the pipe end; The brake mechanism includes an inner peripheral brake member disposed on the inner peripheral side of the pipe end, and an outer peripheral brake member disposed on the outer peripheral side of the pipe end so as to face the inner peripheral brake member, The inner peripheral side surface of the outer peripheral brake member has a central surface portion facing the opposing surface of the inner peripheral brake member, and a pair of protruding surface portions that protrude to both sides in the fore-and-aft direction beyond the opposing surface, and the central surface portion is recessed toward the outer periphery relative to the pair of protruding surface portions.

[0010] According to the pipe making device, the protruding structure of the outer peripheral brake member expands the contact range or contact area of ​​the outer peripheral brake member with the pipe end. In addition, the concave curved surface structure of the outer peripheral brake member prevents only the central surface portion of the inner peripheral side surface of the outer peripheral brake member from contacting the pipe end. Preferably, a pair of protruding surface portions can be made to contact the pipe end. Furthermore, between the pair of protruding surface portions, the opposing surface of the inner peripheral brake member can be made to contact the pipe end. This allows the pipe end to contact the brake mechanism at at least three points. As a result, braking force can be effectively applied, and local concentrated loads on the pipe end can be alleviated, preventing damage to the band-shaped member that constitutes the pipe end. In addition, if the brake mechanism undergoes a rotational or positional displacement due to some external force, a wide area of ​​the tube end is deformed, making it possible to more reliably alleviate locally concentrated loads on the tube end. When the brake mechanism is tightened, the belt-shaped member constituting the pipe end is compressed and thinned between the central surface of the outer peripheral brake member and the opposing surface of the inner peripheral brake member. The belt-shaped member is relatively expanded on the protruding surface portions before and after the central surface. On the other hand, the belt-shaped member on the protruding surface portion is only released toward the inner peripheral side, so it can only deform toward the inner peripheral side, and deformation toward the outer peripheral side is restricted by the protruding surface portion. In other words, the deformation force of the belt-shaped member, such as expansion, on the protruding surface portion can be released toward the inner peripheral side. Therefore, the belt-shaped member can be prevented from being cut into the outer peripheral brake member and being scraped before and after the compression. In addition, since the opposing surface of the inner peripheral brake member can be made to have a certain area, the deformation force of the belt-shaped member, such as expansion, can be dispersed over a wide range. Therefore, the belt-shaped member can be prevented from being scraped by the inner peripheral brake member.

[0011] It is preferable that the inner peripheral side surface is a concave curved surface in the shape of a circular arc, which makes it possible to effectively apply braking force and prevent damage to the band-shaped member that constitutes the end of the pipe.

[0012] It is preferable that the radius of curvature of the concave curved surface is smaller than the target radius of the spiral pipe, thereby enabling the braking force to be applied more effectively.

[0013] It is preferable that the length of the inner peripheral side surface along the front-rear direction is 1.2 times or more the length of the opposing surface along the front-rear direction. This ensures that braking force is applied reliably and that locally concentrated loads on the pipe end are more reliably alleviated. Effect of the Invention

[0014] According to the present invention, in a self-propelled pipe making device having a braking mechanism, damage to the band-shaped member that constitutes the pipe end of a spiral pipe can be prevented and braking force can be reliably applied. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view taken along the axis of an existing pipe that is being rehabilitated by lining the pipe using a pipe manufacturing apparatus according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a side view of the pipe producing apparatus during the rehabilitation work. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an explanatory perspective view of a rehabilitated pipe being produced by the pipe producing apparatus. [Diagram 5] FIG. 5 is a side view of the brake mechanism shown in FIG. [Figure 6] FIG. 6 is a side view of the brake mechanism in a tightened state. [Figure 7] FIG. 7 is a side view showing the brake mechanism in an even tighter state. [Figure 8] FIG. 8 is a side view showing an example of a state in which an external force (disturbance) is applied to the brake mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, one embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, an existing deteriorated pipe 1 is rehabilitated by lining its inner periphery with a rehabilitation pipe 9. The existing pipe 1 to be rehabilitated is, for example, a sewerage pipe buried underground, but the present invention is not limited to this and may be a water supply pipe, an agricultural water pipe, a gas pipe, a hydroelectric power generation water pipe, a tunnel, etc.

[0017] 1 and 2, the rehabilitation pipe 9 is configured as a helical pipe obtained by helically winding a strip-shaped member 90 (profile). The strip-shaped member 90 is made of a synthetic resin such as polyvinyl chloride (PVC) and is formed into a fixed cross-sectional shape.

[0018] As shown in FIG. 3, the belt-shaped member 90 includes a flat belt portion 91, male and female mating portions 93, 94, and a plurality of ribs 95. A female mating portion 93 is provided at one end (left end in FIG. 3) in the width direction of the flat belt portion 91. The female mating portion 93 has a mating groove 93a that opens to the inner periphery side (upper in FIG. 3) and is raised to the outer periphery side (lower in FIG. 3). A male mating portion 94 consisting of a convex strip that protrudes to the outer periphery side is provided at the other end (right end in FIG. 3) in the width direction of the flat belt portion 91. A plurality of ribs 95 that protrude to the outer periphery side are provided in the flat belt portion 91 between the mating portions 93, 94, lined up at intervals in the width direction of the belt-shaped member 90 (left and right in FIG. 3). A steel strip-shaped reinforcing material 96 is embedded in the rib 95. A narrow groove 97 is formed between the protuberance of the female fitting portion 93 and the nearest rib 95. The groove 97 becomes narrower as it approaches the groove bottom 97 on the flat band portion 91 side.

[0019] 3, in the rehabilitation pipe 9, the belt-shaped member 90 is wound in a spiral shape, and adjacent fitting portions 93, 94 that are offset from each other by one turn are joined together by recess-projection fitting. The male fitting portion 94 is fitted into the fitting groove 93a of the female fitting portion 93.

[0020] As shown in FIG. 1, the rehabilitating pipe 9 is produced by a pipe production device 10. As shown in FIG. 2, the pipe production device 10 is disposed in a portion of the circumferential direction of approximately one periphery of the tip of the rehabilitating pipe 9 in the extension direction ED (hereinafter referred to as the "pipe end 9e"). The total length of the pipe production device 10 is approximately a few tenths to a few tenths of the periphery of the rehabilitating pipe 9. The portion of the pipe end 9e other than the portion where the pipe production device 10 is disposed is open to the inner circumference side. The pipe production device 10, like the pipe production device disclosed in the above-mentioned Patent Document 2, has a non-inner circumference regulating structure without an inner circumference regulating body. The pipe production device 10 produces the rehabilitating pipe 9 while being propelled (self-propelled) in a counterclockwise spiral winding direction (propulsion direction) in FIG. 2 along the inner circumference of the existing pipe 1.

[0021] As shown in Figure 2, the pipe making apparatus 10 includes an apparatus frame 11, a drive unit 12 (propulsion reaction force application unit), a track guide 14, an engagement guide 15, a pipe end guide 16, and a brake mechanism 20 (resistance force application unit). The equipment frame 11 is frame-shaped or housing-shaped. The equipment frame 11 and thus the pipe making device 10 are mounted on the pipe end 9e so as to be movable (propelled) in the forward / backward direction LD. As shown in FIG. 1, the forward / backward direction LD of the pipe making device 10 is oriented in the spiral winding direction. The height direction of the pipe making device 10 is oriented in the radial direction of the rehabilitating pipe 9. The width direction WD of the pipe making device 10 (hereinafter referred to as the "equipment width direction WD") is approximately aligned with the pipe axis L9 and extension direction ED of the rehabilitating pipe 9, and strictly speaking is shifted from the pipe axis by the lead angle of the spiral.

[0022] 2, a drive unit 12, a track guide 14, a fitting guide 15, a tube end guide 16, and a brake mechanism 20 (brake mechanism) are provided on an apparatus frame 11. The drive unit 12 is disposed inside the tube end 9e, and includes drive rollers 13 consisting of at least one pair (two pairs in this case) of inner rollers 13a and outer rollers 13b, and a power transmission mechanism (not shown) such as a hydraulic motor and gears that rotate the drive rollers 13.

[0023] The track guide 14 has an inner track guide portion 14a and an outer track guide portion 14b, and these guide portions 14a, 14b both extend rearward in the propulsion direction (leftward in FIG. 2, hereinafter referred to as "rearward propulsion") from the device frame 11. The track guide 14 does not extend to the position where the pipe end portion 9e and the trailing belt portion 90b are joined. At the tip of the track guide 14, a fitting guide 15 having an inner fitting guide portion 15a and an outer fitting guide portion 15b is supported.

[0024] As shown in Fig. 2, a brake mechanism 20 (brake attachment) is provided at the front of the device frame 11 in the propulsion direction (the right side in Fig. 2, hereinafter referred to as "forward propulsion"). The brake mechanism 20 includes an attachment arm 21, an inner peripheral brake member 30 (brake shoe), and an outer peripheral brake member 40 (brake guide). The base end of the attachment arm 21 is detachably attached to the bottom of the device frame 11. The brake mechanism 20 is attached to the device frame 11 in a detachable manner.

[0025] The attachment arm 21 extends in a cantilever fashion from the bottom of the device frame 11 toward the front of the propulsion. A brake holder 22 is provided at the tip of the attachment arm 21. An inner peripheral brake member 30 and an outer peripheral brake member 40 are held by the brake holder 22. As shown in Fig. 4, the brake members 30, 40 are disposed one pitch away from the drive roller 13 and extend rearward along the pipe axis L9 of the rehabilitating pipe 9 (helical pipe).

[0026] 3 and 5, the inner peripheral brake member 30 is formed in a generally rectangular parallelepiped block shape. The outer peripheral side surface 31 (the surface facing the outer peripheral brake member 40) of the inner peripheral brake member 30 is flat. Corners 33 formed by both side surfaces 32 in the propulsion direction of the inner peripheral brake member 30 and the outer peripheral side surface 31 are R-chamfered.

[0027] As shown in FIG. 3, the outer peripheral brake member 40 is disposed closer to the bottom of the pipe making apparatus 10 (lower in FIG. 3) than the inner peripheral brake member 30, and is disposed so as to face the inner peripheral brake member 30. As shown in FIG. 5, the outer peripheral brake member 40 is formed in a roughly inverted triangular or inverted trapezoidal shape that widens toward the inner peripheral brake member 30 when viewed in the apparatus width direction WD, and is formed in a thin plate shape as shown in FIG. 3. The cross-sectional shape of the outer peripheral brake member 40 is matched to the cross-sectional shape of the groove portion 97. The thickness of the outer peripheral brake member 40 is matched to the groove width of the groove portion 97, and becomes smaller toward the tip of the outer peripheral brake member 40. The thickness direction of the outer peripheral brake member 40 is oriented in the width direction WD of the pipe making apparatus 10 (left and right in FIG. 3).

[0028] 5, the inner peripheral side surface 41 of the outer peripheral brake member 40 has a central surface portion 41c and a pair of protruding surface portions 41a on both sides thereof. The central surface portion 41c faces the opposing surface 31 of the inner peripheral brake member 30. The pair of protruding surface portions 41a protrude further to both sides in the propulsion direction than the opposing surface 31. Corners 43 formed by each protruding surface portion 41a of the outer peripheral brake member 40 and the oblique side surface 42 are roughly semicircular. Length L of the inner peripheral side surface 41 of the outer peripheral brake member 40 along the front-rear direction LD 41 is the length L of the opposing surface 31 of the inner peripheral brake member 30 along the front-rear direction LD. 31 Preferably, it is 1.2 times or more (L 41 ≧1.2×L 31 ), more preferably about 2 to 3 times (2×L 31 ≦L 41 ≦3×L 31 ).

[0029] As shown in Fig. 5, the central surface portion 41c is recessed toward the outer periphery with respect to the pair of protruding surface portions 41a. This makes the inner peripheral side surface 41 of the outer peripheral brake member 40 a concave curved surface. Preferably, it is an arc-shaped concave curved surface. The radius of curvature of the inner peripheral side surface 41 is preferably smaller than the target pipe making radius of the rehabilitating pipe 9, more preferably about 50% to less than 100% of the target pipe making radius, and even more preferably about 80% to 90% of the target pipe making radius. When manufacturing the rehabilitation pipe 9 so that it is attached to the entire inner circumference of the existing pipe 1, the radius of curvature of the inner side surface 41 is preferably smaller than the pipe radius of the existing pipe 1, more preferably approximately 50% to less than 100% of the pipe radius of the existing pipe 1, and even more preferably approximately 80% to 90% of the pipe radius of the existing pipe 1.

[0030] As shown in Fig. 5, the pipe end 9e is passed between the brake members 30, 40. The brake members 30, 40 clamp the pipe end 9e from the inner and outer circumferential sides. The inner brake member 30 is disposed on the inner circumferential side of the pipe end 9e and abuts against the inner circumferential surface of the pipe end 9e. The outer brake member 40 is disposed on the outer circumferential side of the pipe end 9e. The outer brake member 40 fits into a groove portion 97 of the pipe end 9e and is engaged with the pipe end 9e so as to be slidable in the forward direction (the direction perpendicular to the paper surface of Fig. 3).

[0031] The brake holder 22 is provided with a braking force adjustment means 50. The braking force adjustment means 50 includes an adjustment bolt 51. The adjustment bolt 51 allows the height of the inner peripheral brake member 30 to be adjusted. This moves the brake members 30, 40 closer to or farther from each other, adjusting the clamping force of the brake members 30, 40 against the pipe end 9e, and therefore the frictional resistance between the brake members 30, 40 and the pipe end 9e.

[0032] Specifically, as shown in FIG. 5, when the adjustment bolt 51 (FIG. 3) is loosely tightened, the portion 98 of the band-shaped member 90 that constitutes the pipe end 9e, passing through the brake members 30, 40, is hardly deformed and maintains its original curvature and thickness. The two corners 33 of the inner brake member 30 are in contact with the inner peripheral surface of the pipe end 9e. A small gap is formed between the flat opposing surface 31 of the inner brake member 30 and the inner peripheral surface of the pipe end 9e. In the outer brake member 40, a pair of protruding surface portions 41a or corners 43 are in contact with the groove bottom 97b of the groove portion 97 of the pipe end 9e. The central surface portion 41c is separated from the groove bottom 97b. More preferably, the side surface of the outer brake member 40 is in contact with the inner surface of the groove portion 97, as shown in FIG. 3.

[0033] As shown in Fig. 6, when the adjustment bolt 51 (Fig. 3) is tightened, the inner brake member 30 and the outer brake member 40 are brought closer together, so that the opposing surface 31 of the inner brake member 30 is pressed against the inner surface of the pipe end 9e, and the entire inner side surface 41 of the outer brake member 40, i.e., the central surface portion 41c and the pair of protruding surface portions 41a, are pressed against the groove bottom 97b. As a result, the portion 98 between the brake members 30, 40 at the pipe end 9e is deformed to follow the inner side surface 41 of the outer brake member 40.

[0034] As shown in Fig. 7, when the adjustment bolt 51 (Fig. 3) is further tightened, the distance between the opposing surface 31 of the inner peripheral brake member 30 and the central surface portion 41c of the outer peripheral brake member 40 becomes even narrower. As a result, the portion 98c of the band-shaped member 90 constituting the pipe end portion 9e, which is sandwiched between the opposing surface 31 and the central surface portion 41c, is compressed in the thickness direction and becomes thinner than the portions 98a on the protruding surface portions 41a on both sides.

[0035] The rehabilitating pipe 9 is manufactured by the pipe manufacturing apparatus 10 as follows. <Paying out the belt-shaped member 90> As shown in Figure 1, the unmade pipe portion of the strip-shaped member 90 (hereinafter referred to as the "following strip portion 90b") is unwound from a winding drum 6 on the ground, passed through a manhole 4, and passed inside the already-made rehabilitated pipe 9 in the existing pipe 1, and sent to the pipe making device 10 at the pipe end 9e.

[0036] <Joining process> The trailing belt portion 90b is introduced between a pair of drive rollers 13 of the pipe making device 10. As these drive rollers 13 are driven to rotate, the trailing belt portion 90b is pushed obliquely toward the rear side in the propulsion direction (the left side in FIG. 2, hereinafter referred to as "rear propulsion") and radially outward. The trailing belt portion 90b is guided by the track guide 14 and introduced into the fitting guide 15. Within the fitting guide 15, the male fitting portion 94 of the trailing belt portion 90b is fitted (joined) with the female fitting portion 93 of the pipe end portion 9e. As a result, the trailing belt portion 90b is incorporated into the rehabilitated pipe 9 (helical pipe), and the rehabilitated pipe 90 is stretched in the extension direction along the pipe axis.

[0037] <Promotion process> The engagement generates a thrust reaction force, and the pipe making apparatus 10 is propelled (self-propelled) forward (to the left in FIG. 4).

[0038] <Resistance applying process> As the pipe making device 10 advances, the brake members 30, 40 and the pipe end 9e slide against each other, generating sliding friction. This applies a braking force to the pipe making device 10.

[0039] <Pipe diameter control process> By adjusting the tightening amount of the adjustment bolt 51 of the braking force adjustment means 50, the braking members 30, 40 can be moved closer or farther apart to increase or decrease the braking force. When the adjustment bolt 51 is tightened to increase the braking force, the feed amount of the trailing belt portion 90b by the drive roller 13 becomes greater than the thrust amount of the pipe making device 10, and the rehabilitated pipe 9 (helical pipe) is made into a pipe with an expanded diameter. This makes it possible to make the rehabilitated pipe 9 so that it fits snugly around the entire inner circumference of the existing pipe 1. Conversely, when the adjustment bolt 51 is loosened to reduce the braking force, the rehabilitated pipe 9 (helical pipe) is made into a pipe with a reduced diameter. In this way, the pipe diameter can be controlled.

[0040] According to the pipe making device 10, the inner peripheral side surface 41 of the outer peripheral brake member 40 is a concave curved surface that protrudes from the opposing surface 31 of the inner peripheral brake member 30, thereby expanding the contact area between the brake mechanism 20 and the pipe end 9e. That is, as shown in Fig. 5, when the adjustment bolt 51 is loosely tightened, the two corners 33 of the inner peripheral brake member 30 contact the inner peripheral surface of the pipe end 9e, and a pair of protruding surface portions 41a of the outer peripheral brake member 40 contact the groove bottom 97b of the pipe end 9e outside the contact area in the pipe circumferential direction. As shown in Figs. 6 and 7, when the adjustment bolt 51 (Fig. 3) is tightened, the opposing surface 31 of the inner peripheral brake member 30 contacts the inner peripheral surface of the pipe end 9e, and the entire area of ​​the inner peripheral side surface 41 of the outer peripheral brake member 40 contacts the groove bottom 97b of the pipe end 9e over a wider range in the pipe circumferential direction. Therefore, the frictional area between the brake mechanism 20 and the pipe end 9e can be dispersed or widened in the pipe circumferential direction, which prevents the band-shaped member 90 constituting the pipe end 9e from being damaged, such as being scraped off. If the inner peripheral side surface 41 of the outer peripheral brake member 40 were flat, regardless of whether it protruded or not and regardless of the degree of tightening, only the central surface portion 41c of the outer peripheral brake member 40 would be able to come into contact with the pipe end portion 9e, and localized friction would be unavoidable, which could result in scraping.

[0041] Also, as shown in Fig. 5, when the adjustment bolt 51 (Fig. 3) is loosely tightened, the pipe end 9e is bent at three points by the inner peripheral brake member 30 and the protruding surface portions 41a on both outer sides thereof, thereby enabling the braking force to be effectively exerted. As shown in Fig. 6, when the adjustment bolt 51 (Fig. 3) is tightened, the portion 98 of the pipe end 9e passing through the brake members 30, 40 is deformed to follow the curvature of the inner peripheral side surface 41 of the outer peripheral brake member 40, so that the radius of curvature becomes smaller than that of the other portions of the pipe end 9e. This makes it possible to apply a bending force instead of or in addition to compressing the pipe end 9e in the thickness direction, and to more effectively exert the braking force.

[0042] As shown in FIG. 7, when the adjustment bolt 51 (FIG. 3) is further tightened, the portion 98c of the pipe end 9e sandwiched between the opposing surface 31 and the central surface portion 41c is compressed and thinned. The nearest portions 98a on both sides (left and right in FIG. 7) of the compressed portion 98c are relatively expanded. The nearest portions 98a are disposed on the protruding surface portion 41a and are released toward the inner circumferential side (upper side in FIG. 7). Therefore, the nearest portions 98a are allowed to deform toward the inner circumferential side, while the nearest portions 98a are restricted from deforming toward the outer circumferential side (lower side in FIG. 7) by the protruding surface portion 41a. In other words, the deformation force of the band-shaped member 90 on the protruding surface portion 41a, such as the expansion, can be released toward the inner circumferential side. Therefore, the nearest portions 98a of the compressed portion 98c of the band-shaped member 90 can be prevented from being cut into and scraped by the outer circumferential brake member 40. 3, the inner peripheral brake member 30 is in the shape of a block that is much wider than the thin-walled, claw-shaped outer peripheral brake member 40, and can therefore receive the deformation force, such as the expansion of the belt-shaped member 90, over a wide range in the width direction WD. This prevents the belt-shaped member 90 from being scraped by the inner peripheral brake member 30.

[0043] As shown in Fig. 8, some external force F (disturbance) may be applied to the brake mechanism 20, causing the brake members 30, 40 to undergo positional or rotational displacement. On the other hand, since the outer peripheral brake member 40 has a pair of protruding surface portions 41a, the area of ​​the tube end 9e that is deformed by the positional or rotational displacement is expanded. This allows the localized concentrated load to be alleviated, and damage to the band-shaped member 90 that constitutes the tube end 9e to be suppressed. If the outer peripheral brake member 40 did not have the protruding surface portion 41a, the pipe end 9e would be largely deformed locally by the external force F, and would be damaged by the concentrated load. In this way, the pipe making apparatus 10 can reliably apply braking force without damaging the band-shaped member 90 that constitutes the pipe end 9e of the rehabilitated pipe 9.

[0044] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the brake mechanism 20 may have a plurality of pairs of inner and outer brake members 30, 40. The plurality of pairs of inner and outer brake members 30, 40 may be arranged side by side in the circumferential direction of the pipe end portion 9e. The inner peripheral side surface 41 of the outer peripheral brake member 40 needs only to have a central surface portion 41c recessed relative to a pair of protruding surface portions 41a, and is not limited to being arc-shaped with a constant curvature; the protruding surface portion 41a and the central surface portion 41c may have different curvatures, and a step or corner portion may be formed between the protruding surface portion 41a and the central surface portion 41c. The opposing surface 31 of the inner peripheral brake member 30 may be convex. Alternatively, the fitting guide 15 may not be provided, and the male fitting portion 94 of the trailing belt portion 90b fed obliquely along the track guide 14 may be pushed into the female fitting portion 93 of the tube end portion 9e. An inner circumference regulating body such as a link roller or an outer circumference regulating body that is provided on the outer periphery of the rehabilitating pipe and adjusts the cross-sectional shape of the rehabilitating pipe may be provided. [Industrial Applicability]

[0045] The present invention can be applied, for example, to the rehabilitation of deteriorated sewer pipes. [Explanation of symbols]

[0046] 1 Existing pipes 10 Pipe making equipment 11 Equipment Frame 12 Drive unit (propulsion reaction force applying unit) 13 Drive roller 20 Brake mechanism (resistance applying part) 30 Inner peripheral brake member 31 Outer periphery side (opposing surface) 40 Periphery brake member 41 Inner circumference side 41a Overhanging surface part 41c Center part 50 Brake force adjustment means 51 Adjustment bolt 9 Rehabilitation pipe 9e Tube end 90 Belt-shaped member (profile) 91 Flat belt 93 Female mating part 94 Male mating part 97 Groove 97b Groove bottom LD front and back direction ED stretching direction L 31 Outer side length L 41 Inner side length

Claims

1. A pipe making apparatus for making a helical pipe by winding a strip-shaped member along a helical winding direction and joining adjacent edges of the strip-shaped member that are offset from each other, comprising: an apparatus frame provided at a tube end portion on a tip side in a stretching direction of the helical tube being produced, the tube end portion being movable in the front-rear direction with the front-rear direction facing the winding direction; a drive unit including at least a pair of drive rollers provided on the device frame so as to be disposed inside the tube end, the drive unit clamping the unprocessed tube portion of the belt-shaped member and pushing it obliquely toward the tube end; a brake mechanism attached to the device frame and rubbing against the pipe end; The brake mechanism includes an inner peripheral brake member disposed on the inner peripheral side of the pipe end, and an outer peripheral brake member disposed on the outer peripheral side of the pipe end so as to face the inner peripheral brake member, A pipe making apparatus characterized in that the inner side surface of the outer peripheral brake member has a central surface portion facing the opposing surface of the inner peripheral brake member, and a pair of protruding surface portions that protrude on both sides in the fore-and-aft direction beyond the opposing surface, and the central surface portion is recessed toward the outer periphery relative to the pair of protruding surface portions.

2. 2. A pipe making apparatus according to claim 1, wherein the inner peripheral side surface is an arc-shaped concave curved surface.

3. A pipe making apparatus as described in claim 2, characterized in that the radius of curvature of the concave curved surface is smaller than the target pipe making radius of the spiral pipe.

4. A pipe making apparatus as described in any one of claims 1 to 3, characterized in that the length of the inner side surface along the front-to-back direction is 1.2 times or more the length of the opposing surface along the front-to-back direction.

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