JP2024085730A - Pipe making device for expanding regeneration pipe - Google Patents

Abstract

To extend an extended end part of a regeneration pipe smoothly and securely in an expander pipe making method.SOLUTION: A spiral tubular regeneration pipe 3 comprising a belt-like member 10 is arranged in a pipeline 1 which is a regeneration target. A subsequent belt part 19 in the belt-like member 10 is introduced from an introduction part 40 of a pipe making device 20 for expansion to a pipe making part 30. In the pipe making part 30, the belt-like member 10 is wound along a spiral direction and marginal parts 13, 14 of a turn and its next turn of the belt-like member 10 are engaged at their convexoconcaves to form a new tube end 3e of the regeneration pipe 3 and the tube end 3e is screwed in the spiral direction. By this, a peripheral length of a tube part 3a subjected to peripheral length variable processing of the regeneration pipe 3 is expanded. On finishing processing of expansion, a cutting member 50 is allowed to face an introduction port 40a of the introduction part 40, and a part of a projection ridge 14b of the marginal part 14 of the belt-like member 10 is cut by using the cutting member 50.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pipe manufacturing device for rehabilitating existing pipelines, such as aging sewerage systems, by constructing a helical rehabilitating pipe along the inner circumference of the pipeline, and in particular to a pipe manufacturing device that constructs the rehabilitating pipe using the so-called expander pipe manufacturing method.

A method of constructing a helical rehabilitation pipe inside an aging sewerage pipeline or the like to rehabilitate the pipeline is known (see, for example, Patent Document 1, etc.). A helical rehabilitation pipe is constructed by winding a strip-shaped member in a helical shape and joining adjacent edge portions that are one turn apart.

Patent Document 1 discloses a so-called expander pipe manufacturing method as one method for constructing a helical rehabilitated pipe. In detail, a rehabilitated pipe with a diameter smaller than the inside diameter of the existing pipe is manufactured by interposing a cutting wire between the adjacent edge portions of the band-shaped member. Then, by pulling the cutting wire, one of the convex ridges for fitting the concave and convex portions of the edge portion of the band-shaped member is cut in sequence along the winding direction from the arrival end side to the starting end side of the rehabilitated pipe, thereby making the circumference variable. In parallel with this, a push-type pipe manufacturing device installed in the starting manhole further supplies the band-shaped member to the rehabilitated pipe and applies a twisting force to the rehabilitated pipe, thereby expanding (expanding) the circumference of the pipe portion that has been subjected to the circumference variable processing. As a result, the rehabilitated pipe is attached to the entire inner surface of the existing pipe.

JP 2021-115750 A

When using the expander pipe making method, it is important to manage the length of the cone section, which expands from the unexpanded small diameter pipe section of the rehabilitated pipe to the expanded large diameter pipe section. If the cone section is too long, it will not adhere well to the inner surface of the existing pipe. On the other hand, if the cone section is too short, buckling (breakage of the uneven fit between adjacent edges) will occur between the unexpanded small diameter pipe section and the cone section. In particular, at the finishing stage when the distance between the cone section and the pipe making device is within a certain size, the cone section cannot be long enough, making buckling more likely to occur. In addition, the pull angle of the cutting wire becomes steep, creating large resistance. If the pull angle is made small, the cutting wire may become tangled in the pipe making device.

Therefore, when the finishing stage is reached, it is conceivable to cut off the ridges of the belt-shaped member before it is introduced into the pipe making device. In this case, if the previously cut portion is expanded until it joins with the portion cut by the cutting wire, there is no need to withdraw the cutting wire, and the end of the rehabilitated pipe can be separated from the pipe making device and allowed to expand naturally. However, the worker in charge of the pipe making device must simultaneously check the engagement of the ridges and grooves of the belt-shaped member, check the sealing, check the insertion position of the cutting wire, and so on, and if the worker has to manually cut off the ridges while performing the above-mentioned operations, this creates a problem of a heavy burden on the worker.
In consideration of the above circumstances, the present invention aims to provide a pipe making apparatus that can cut the convex ribs of a belt-shaped member without placing an excessive burden on the worker during the finishing stage of the expander pipe making method.

In order to solve the above problems, the present invention provides a pipe manufacturing apparatus for expanding the circumferential length of a pipe portion that has been subjected to a circumferential length variable treatment of a helical rehabilitating pipe that is disposed in a pipeline to be rehabilitated, comprising:
a pipe manufacturing section that forms a new pipe end of the rehabilitating pipe by winding a strip-shaped member constituting the rehabilitating pipe in a spiral direction and fitting adjacent edge portions of the strip-shaped member one turn apart into a recessed and projecting engagement, and that screws the pipe end in the spiral direction to obtain an expansion force for the pipe portion;
an introduction section having an introduction port for introducing a subsequent strip portion of the strip member connected to the tube end into the tube making section;
a cutting member provided in the introduction section so as to be movable forward and backward or detachable in the introduction section so as to face the introduction port, the cutting member cutting a part of the projection for engagement formed on one edge portion of the belt-shaped member;
The present invention is characterized by a pipe making device for expanding rehabilitated pipes, which is equipped with the above.

Before the finishing stage is reached, the cutting member is retracted or removed, so that the ridges are not cut by the cutting member.
When the finishing stage is reached, the operation of the pipe making section is temporarily stopped, and the cutting member is attached or advanced and fixed, so that the cutting member bites into a portion of the ridge of the succeeding band section. When the operation of the pipe making section is then resumed, as the succeeding band section is fed into the pipe making section, a portion of the ridge is continuously cut by the cutting member. There is no need for the operator in charge of the pipe making device to cut the material manually, which reduces the burden on the operator. When a problem occurs, such as a malfunction in the fit of the concave and convex parts of the band-shaped member, it can be dealt with quickly.

Preferably, the cutting member includes a base portion attached to the introduction portion, and a blade portion protruding from the base portion toward the upstream side in the direction in which the trailing strip portion is introduced.
This allows the blade portion to be continuously cut off from a portion of the ridge by feeding the subsequent band portion into the pipe making section while the blade portion is biting into a portion of the ridge.
It is preferable that the base portion be movable forward and backward relative to the introduction portion or be detachable.

Preferably, the base is formed with a long hole through which a bolt for attachment to the introduction portion is inserted, and the width direction of the trailing band portion and the longitudinal direction of the long hole are perpendicular to each other.
Thus, by loosening the mounting bolt, the cutting member can be moved back and forth in a direction perpendicular to the width direction of the trailing strip portion to adjust its position. By tightening the mounting bolt, the position of the cutting member is fixed.

Preferably, the introduction section has an outer guide section to which the ridge of the trailing band section faces, and an inner guide section to which the inner side surface of the trailing band section faces, the introduction port is formed between these guide sections, and the cutting member is provided on the outer guide section. This allows the cutting member to be positioned so as to face the ridge.

Preferably, the inner guiding portion is provided with a regulating member for pressing the inner circumferential side surface of the trailing belt portion so as to protrude upstream of the cutting member in the direction in which the trailing belt portion is introduced.
As a result, even if the trailing band portion before being introduced into the introduction section becomes curved so that the inner side surface of the trailing band portion becomes concave due to a curling tendency or the like, the trailing band portion can be pressed from the inner side by the regulating member, thereby preventing the trailing band portion from separating from the cutting member, and cutting can be performed reliably.

Preferably, a regulating support member is provided on the outer circumferential guide portion so as to face the regulating member, and ends of the regulating support member and the regulating member on the same side in the width direction are connected to each other by a connecting member.
This allows the restricting member to reliably press the belt-shaped member from the inner peripheral side.
At least one of the regulating support member and the regulating member may be slidable in a direction facing each other, so that the regulating support member and the regulating member are spaced apart from each other before the finishing stage is reached, and the regulating support member and the regulating member are brought close to each other in the finishing stage, so that the belt-shaped member can be pressed from the inner periphery side by the regulating member.

According to the present invention, in the finishing stage of the expander pipe manufacturing method, the convex ribs of the subsequent band portion of the band-shaped member can be pre-cut without placing an excessive burden on the worker.

FIG. 1 is a side view showing a rehabilitation pipe being constructed within an existing pipeline in a middle stage of a finishing process in an expansion step according to a first embodiment of the present invention. Fig. 2(a) is an enlarged perspective cross-sectional view of a circular portion IIa in Fig. 7(a), Fig. 2(b) is an enlarged perspective cross-sectional view of a circular portion IIb in Fig. 7(c), and Fig. 2(c) is an enlarged perspective cross-sectional view of a circular portion IIc in Fig. 7(c). FIG. 3 is a front view of the expansion extrusion tube making apparatus taken along line III-III in FIG. FIG. 4 is a perspective view of a cutting member provided in the main extrusion tube making device. Fig. 5(a) is a front cross-sectional view of the circular portion VI of Fig. 3 before the finishing process, Fig. 5(b) is a front cross-sectional view of the circular portion VI of Fig. 3 in a preparation step for the advancement of the cutting member in the finishing process, and Fig. 5(c) is a front cross-sectional view of the circular portion VI of Fig. 3 in a advancement step of the cutting member in the finishing process. FIG. 6 is an enlarged front sectional view of the circled portion VI in FIG. 7(a) is a side view showing the rehabilitating pipe in an end-extrusion pipe-making process, FIG 7(b) is a side view showing the rehabilitating pipe at the end of the end-extrusion pipe-making process, and FIG 7(c) is a side view showing the rehabilitating pipe in an expansion process. Fig. 8(a) is a side view showing the rehabilitating pipe at a stage where the circumferential length variable portions on both sides join in the finishing process, Fig. 8(b) is a side view showing the rehabilitating pipe at a processing stage after the joining, and Fig. 8(c) is a side view showing the rehabilitating pipe at the final stage of the finishing process. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. FIG. 10 is a front cross-sectional view showing an installation portion of a cutting member in an expansion end extrusion tube forming apparatus according to a second embodiment of the present invention, in a state during a finishing process. FIG. 11 is a plan sectional view showing the installation portion of the second embodiment in a state during a finishing process. FIG. 12 is a plan sectional view showing the installation portion of the second embodiment in a state before the finishing process. FIG. 13 is a plan sectional view showing a location of a cutting portion in the first modified example of the second embodiment in a state before finishing processing. FIG. 14 is a front cross-sectional view showing a location of the cutting portion in the second modification of the second embodiment during a finishing process. Fig. 15(a) is a side view taken along line XVa-XVa in Fig. 15(b) showing the restricting member in the third modified example of the second embodiment, and Fig. 15(b) is a front cross-sectional view taken along line XVb-XVb in Fig. 15(a). FIG. 16 shows a fourth modified example of the second embodiment, and is a side view of a restricting member.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First embodiment (FIGS. 1 to 9)
Fig. 1 shows the state of rehabilitating an aged existing pipeline 1. The existing pipeline 1 to be rehabilitated is, for example, a sewerage pipe buried underground, but the present invention is not limited to this and may be a water supply pipe, an agricultural water pipe, a gas pipe, a hydroelectric power generation water pipe, a tunnel, etc. The pipeline 1 is rehabilitated by lining the inner circumference of the pipeline 1 with a rehabilitation pipe 3.

As shown in FIG. 1, the rehabilitation pipe 3 is a spiral pipe made of a strip-shaped member 10. The material of the strip-shaped member 10 is composed of a synthetic resin such as polyvinyl chloride (PVC). As shown in FIG. 2 and FIG. 9, the strip-shaped member 10 is formed in a long strip shape with a constant cross-sectional shape. The edge portions 13 and 14 on both sides in the strip width direction of the strip-shaped member 10 are formed with uneven portions for uneven engagement.

In detail, two (multiple) first grooves 13a and second grooves 13b that open to the inner periphery (lower side in FIG. 2) are formed side by side in one edge portion 13. Two (multiple) first ridges 14a and second ridges 14b that protrude to the outer periphery (upper side in FIG. 2) are formed side by side in the other edge portion 14. In the rehabilitation pipe 3, the first ridge 14a is fitted into the first groove 13a, and the second ridge 14b is fitted into the second groove 13b. A rib 15 is formed in the middle of the belt-width direction of the belt-shaped member 10 so as to protrude to the outer periphery.
The cross-sectional shape of the belt-shaped member 10 can be modified as appropriate.

As shown in FIG. 1, the rehabilitated pipe 3 is produced by a push-type pipe production device 20. The pipe production device 20 includes a base 21, a pipe production section 30, and an introduction section 40. The base 21 and thus the pipe production device 20 are installed at the bottom of the starting manhole 4 that is connected to the pipe mouth 1e of the pipeline 1.

As shown in Fig. 3, the pipe making section 30 is supported on the base 21. The pipe making section 30 includes an outer periphery regulating body 31 and pinch rollers 32, 33. The outer periphery regulating body 31 is formed in a spirally twisted annular shape. As shown in Fig. 1, the axis of the annular outer periphery regulating body 31 and thus the axis _L30 of the pipe making section 30 are arranged along an extension of the pipe axis of the pipeline 1. As shown in Fig. 3, the pinch rollers 32, 33 are provided on the side portions of the outer periphery regulating body 31. A diameter adjustment mechanism 34 is provided at the upper end of the outer periphery regulating body 31.

As shown in FIG. 3, an introduction section 40 is provided on the upper side of the pinch rollers 32, 33 in the pipe making section 30 so as to protrude upward. The introduction section 40 is for guiding the trailing band portion 19 connected to the starting pipe end 3e of the rehabilitating pipe 3 in the band-shaped member 10 to the pipe making section 30, and has an outer circumferential guide section 41 and an inner circumferential guide section 42. Along the left-right direction perpendicular to the axis L30 of the pipe making section ₃₀ , the outer circumferential guide section 41 is arranged on the outside (left side in FIG. 3), and the inner circumferential guide section 42 is arranged on the inside (right side in FIG. 3). The outer circumferential guide section 41 includes a vertically long half housing 43 and upper and lower multiple stages of outer circumferential guide rollers 45 housed in the half housing 43. The inner circumferential guide section 42 includes a vertically long half housing 44 and upper and lower multiple stages of inner circumferential guide rollers 46 housed in the half housing 44. The rotation axes of the guide rollers 45, 46 are oriented parallel to the axis _L30 of the pipe making section 30. The guide sections 41, 42 face each other and are connected by a connecting means (not shown). The internal spaces of the half housings 43, 44 are aligned.

As shown in Fig. 3, an introduction port 40a is formed between these guide portions 41, 42. As shown in Fig. 1, the width direction of the introduction port 40a is oriented parallel to the axis _L30 of the pipe making portion 30.

As shown in FIG. 3, the introduction section 40 is provided with a cutting member 50. As shown in FIG. 4, the cutting member 50 includes a base section 51, a blade section 52, and a reinforcing wall 53. The base section 51 is formed in a horizontal rectangular plate shape. A long hole 51b extending along the longitudinal direction is formed in the base section 51. The longitudinal direction of the base section 51 and the long hole 51b is perpendicular to the width direction of the introduction port 40a.

A blade portion 52 is provided at one end in the longitudinal direction of the base portion 51. The blade portion 52 protrudes upward from the base portion 51 (upstream in the direction in which the trailing strip portion 19 of the strip-shaped member 10 is introduced). The upper edge of the blade portion 52 forms a cutting edge 52a.

An approximately triangular reinforcing wall 53 is provided on one edge in the width direction of the cutting member 50. The reinforcing wall 53 is joined to the base portion 51 and the blade portion 52. The reinforcing wall 53 maintains the angle between the base portion 51 and the blade portion 52 at approximately a right angle. As shown in Fig. 1, the reinforcing wall 53 is preferably provided on the edge of the cutting member 50 facing the tip side (right side in Fig. 1) in the extrusion direction of the pipe making section 30. No reinforcing wall 53 is provided on the edge on the opposite side (left side in Fig. 1) of the cutting member 50.
In addition, if the cutting member 50 has a sufficient rigidity so that it will not deform even without the reinforcing wall 53, the reinforcing wall 53 may be omitted.

As shown in Figs. 1 and 3, the base portion 51 of the cutting member 50 is placed on the upper surface of the half-split housing 43 of the outer circumferential guide portion 41. As shown in Fig. 5, the mounting bolt 54 is inserted into the long hole 51b and screwed into the half-split housing 43, so that the cutting member 50 is detachably attached to the introduction portion 40. The long hole 51b also allows the cutting member 50 to advance and retreat in a direction perpendicular to the width direction of the introduction port 40a. As shown in Fig. 5(c), the cutting member 50 is advanced so that the blade portion 52 faces the introduction port 40a. As shown in Figs. 5(a) and 5(b), the cutting member 50 is retreated so that the blade portion 52 retreats from the introduction port 40a.

Using the pipe making device 20, the pipeline 1 is rehabilitated by the following expander pipe making method.
<Main extrusion pipe making process>
As shown in Fig. 7(a), the trailing belt portion 19 of the belt-shaped member 10 is fed from the drum 5 on the ground through the starting manhole 4 to the introduction port 40a. The width direction of the trailing belt portion 19 coincides with the width direction of the introduction port 40a. As shown in Fig. 5(a), the protrusions 14a, 14b and the ribs 15 of the trailing belt portion 19 face the outer circumferential guide portion 41, and the inner peripheral side surface 10a faces the inner circumferential guide portion 42. The trailing belt portion 19 descends within the introduction portion 40 while being guided by the guide rollers 45, 46, and is introduced into the pipe making section 30.
The cutting member 50 is placed in a retracted position (FIG. 5A) until a finishing process, which will be described later, is performed.

As shown in FIG. 7(a), in the pipe making section 30, the strip-shaped member 10 is wound along the spiral direction of the inner circumference of the outer periphery regulator 31. The spiral direction is the direction in which the axis of the rehabilitated pipe 3 extends. The adjacent edge portions 13, 14 of the strip-shaped member 10, which are one turn apart, are pinched by the pinch rollers 32, 33, so that the corresponding concave grooves 13a, 13b and convex strips 14a, 14b are fitted together (see FIG. 2(a)). As a result, a new pipe end 3e of the rehabilitated pipe 3 is formed within the outer periphery regulator 31, and the pipe end 3e is pushed out of the outer periphery regulator 31 while rotating and pushed into the pipeline 1 (to the right in FIG. 7(a)) (main extrusion pipe making process). The outer diameter (manufactured pipe diameter) of the rehabilitated pipe 3 during the main extrusion pipe making is regulated by the outer periphery regulator 31 to be smaller than the inner diameter of the existing pipeline 1. The inner diameter of the outer periphery restrictor 31, and therefore the outer diameter of the rehabilitation pipe 3, is adjusted by the diameter adjustment mechanism 34.

As shown in FIG. 2(a), during pipe manufacturing, the first groove 13a is filled with a slow-curing adhesive 17 before engaging with the first ridge 14a. The second groove 13b is preferably filled with a hot melt adhesive 18 during the manufacture of the strip-shaped member 10.

<Wire embedding process>
As shown in Fig. 7(a), in parallel with the above-mentioned original pipe extrusion process, a cutting wire 61 is paid out from a pay-out reel 62 and inserted between the first convex strip 14a and the second convex strip 14b of the belt-shaped member 10 and sandwiched between the edge portions 13, 14 (Fig. 2(a)). As a result, the embedded portion 61a of the cutting wire 61 is embedded over the entire length of the rehabilitating pipe 3. The take-up portion 61b of the cutting wire 61 on the tip side of the embedded portion 61a is drawn out from the tip 3f of the rehabilitating pipe 3 and folded back, and passes through the internal space of the rehabilitating pipe 3 and the starting manhole 4, and is wound around a take-up winch 63 (Fig. 1) on the ground. A drawn-out folded-back portion 61c of the wire 61 is formed at the tip 3f.

<End of the main pipe making process>
As shown in Figure 7 (b), after the tip 3f of the rehabilitation pipe 3 has reached the pipe opening 1f on the arrival manhole 4B side of the pipeline 1, the pipe making device 20 is stopped and the tip 3f is prevented from rotating by the anti-rotation jig 6.

<Circumference variable processing step>
Next, as shown in Fig. 7(c), the take-up winch 63 is driven to take up the take-up portion 61b of the cutting wire 61. As a result, the embedded portion 61a of the cutting wire 61 is successively pulled out from the tip side (right side in Fig. 7(c)) of the rehabilitating pipe 3, and the pull-out fold-back portion 61c is moved along the spiral winding direction toward the base push side (left side in Fig. 7(c)). At this time, as shown in Fig. 2(b), the root portion of the second convex strip 14b is cut by the pull-out fold-back portion 61c of the cutting wire 61. As a result, the rehabilitating pipe 3 is subjected to a circumferential length changing process. The pipe portion 3a of the rehabilitating pipe 3 where the second convex strip 14b has been cut by the cutting wire 61 is twisted to change its circumferential length.

<Expansion process>
As shown in Fig. 7(c), in parallel with the driving of the winding winch 63, the driving of the pipe making device 20 (expansion pipe making device) is resumed. As a result, the succeeding strip portion 19 of the strip-shaped member 10 is introduced from the introduction section 40 into the pipe making section 30, where the strip-shaped member 10 is wound along the spiral direction so that the adjacent edge portions 13, 14 are fitted together. As a result, a new pipe end 3e of the rehabilitating pipe 3 is formed and the pipe end 3e is twisted toward the pipeline 1. As a result, a torsional force (expansion force) in the expansion direction is generated in the pipe portion 3a, and as shown in Fig. 2(c), the edge portions 13, 14 of the pipe portion 3a slide against each other along the spiral direction, expanding the circumferential length of the pipe portion 3a (diameter expansion).

As shown in FIG. 7(c), the expanded pipe section 3a sticks to the inner surface of the pipeline 1 over the entire circumference, forming the large diameter pipe section 3b. The pipe section 3a in the process of being expanded becomes the cone section 3c. The cone section 3c is disposed between the small diameter pipe section 3d, which has not yet been subjected to the circumferential length changing process, and the large diameter pipe section 3b on the end of the rehabilitated pipe 3, and has a truncated cone shape that expands from the small diameter pipe section 3d side to the large diameter pipe section 3b side. Through the circumferential length changing process and the expansion process, the large diameter pipe section 3b gradually extends to the end side (left side in FIG. 7(c)), and the cone section 3c gradually moves toward the end side, i.e., toward the pipe making device 20. By controlling the length of the cone section 3c to be within an appropriate range, buckling and insufficient sticking can be prevented.

<Finishing process>
As shown in Figure 1, when the cone portion 3c approaches within a predetermined distance from the pipe making device 20, the cutting member 50 cuts the second convex rib 14b (part of the convex rib) of the subsequent band portion 19 of the band-shaped member 10 (pre-pipe making cutting process).
More specifically, the operation of the pipe making device 20 and the winding winch 63 is temporarily stopped. Then, as shown by the two-dot chain line in Fig. 5(b), the portion 14b' of the second convex strip 14b of the trailing belt portion 19 facing the cutting member 50 is cut off by an operator. A concave-shaped cut start portion 19c is formed in the trailing belt portion 19 by the cutting. The cutting work is performed manually, for example, by an operator in charge of the pipe making device 20 using a cutting tool such as a cutter.

Next, as shown in FIG. 5(c), the mounting bolt 54 is loosened, the cutting member 50 is advanced to face the inlet 40a, and the blade portion 52 is inserted into the cutting start portion 19c of the trailing band portion 19. This causes the blade tip 52a to face the base portion of the second convex strip 14b on the upstream side (upper side in FIG. 5(c)) of the cutting start portion 19c of the trailing band portion 19 in the feed direction. The mounting bolt 54 is then tightened to fix the cutting member 50 in the advanced position.

Then, the operation of the pipe making device 20 and the winding winch 63 is resumed. Then, as shown in FIG. 6, the trailing strip portion 19 is lowered toward the introduction portion 40, and the blade tip 52a bites into the root portion of the second convex strip 14b upstream of the cutting start portion 19c in the feed direction (upper side in FIG. 6), and cuts the second convex strip 14b. In other words, when the trailing strip portion 19 before pipe making is fed into the pipe making device 20, the second convex strip 14b (part of the convex strip of the edge portion 14) is continuously and automatically cut by the cutting member 50. Therefore, the worker in charge of the pipe making device 20 does not need to continuously cut the second convex strip 14b by hand, and the burden can be reduced. Therefore, the worker can appropriately check the concave-convex fit of the strip-shaped member 10, check the filling of the adhesive 17, check the insertion position of the cutting wire 61, etc. When a problem such as a problem with the concave-convex fit occurs, it can be quickly dealt with.

As shown in FIG. 1, the trailing band portion 19 where the second ridge 14b has been cut is assembled into the small diameter pipe section 3d of the rehabilitated pipe 3 by the pipe making device 20, and the cut start portion 19c is positioned within the small diameter pipe section 3d. At this stage, the pipe section 3g from the pipe end 3e to the cut start portion 19c in the small diameter pipe section 3d is restrained by the pipe section 3h on the cone section 3c side where the second ridge 14b has not been cut, and by the outer periphery regulating body 31. Therefore, the circumferential length of the pipe section 3g does not change, and the pipe sections 3g and 3h of the small diameter pipe section 3d rotate together.

Continuing, the pipe making device 20 and the winding winch 63 are driven to extend the pipe section 3g toward the tip side in the extrusion direction (to the right in FIG. 1). The cone section 3c is moved toward the base pushing side (to the left in FIG. 1). Eventually, as shown in FIG. 8(a) and FIG. 9, the cutting start section 19c reaches the pull-out fold section 61c, and the pipe section 3g merges with the cone section 3c. That is, the section of the band-shaped member 10 constituting the rehabilitated pipe 3 where the second ridge 14b has been cut by the cutting member 50 and the section where the second ridge 14b has been cut by the cutting wire 61 merge together.

After the merging, the winding winch 63 is stopped and is free to rotate.
The pipe making device 20 is driven for a while after the merging, and the subsequent belt portion 19 where the second ridge 14b has been cut off is sent to the pipe end 3e of the rehabilitating pipe 3. As a result, as shown in Figure 8 (b), the pipe portion 3g becomes cone-shaped, and the cone portion 3c and the pipe portion 3g become one terminal cone portion 3i.

The pipe making machine 20 is then stopped.
Next, as shown by the dashed dotted line CL in FIG. 8( b ), the portion of the rehabilitating pipe 3 between the pipe making device 30 and the pipe opening 1 e is cut, and the pipe making device 20 is separated from the rehabilitating pipe 3 .
As shown in Fig. 8(c), the separated pipe making device 20 is removed. This releases the end cone portion 3i and allows it to expand in diameter naturally. The end cone portion 3i may be expanded in diameter by twisting it directly by hand or by using a tool. In this way, the rehabilitating pipe 3 is brought into close contact with the inner peripheral surface of the pipeline 1 over the entire length of the pipeline 1, thereby rehabilitating the pipeline 1.

Next, another embodiment of the present invention will be described. In the following embodiment, the same reference numerals are given to the same components as those in the above-described embodiment, and the description thereof will be omitted.
Second embodiment (FIGS. 10 to 12)
As shown in Fig. 10, the belt-shaped member 10 is usually curled before being introduced into the pipe making device 20, so that the inner peripheral side surface 10a is curved to be a concave surface. This is because the belt-shaped member 10 is plastically deformed while being wound around the drum 5 (see Fig. 1) or the like, or the curl is imparted to the belt by a curl imparting machine (not shown). For this reason, as shown by the phantom line in Fig. 10, at the introduction port 40a, there is a risk that the trailing belt portion 19 will escape inward in the left-right direction (to the right in Fig. 10) from the cutting member 50 in the forward position.

In the second embodiment, as shown in FIG. 10, the introduction section 40 is provided with a regulating unit 70 that regulates the left-right movement of the trailing strip portion 19. The regulating unit 70 includes a regulating member 71, a regulating support member 72, and a pair of connecting members 73. As shown in FIG. 10 and FIG. 11, the regulating member 71 is formed in a block or thick plate shape that is wider than the width of the strip member 10, and is placed on the upper surface of the half housing 44 of the inner circumferential guide section 42. The upper end of the regulating member 71 protrudes upward (upstream in the direction in which the trailing strip portion 19 is introduced) above the cutting member 50.

As shown in Figures 10 and 11, a regulating support member 72 is placed on the upper surface of the half housing 43 of the outer circumferential guide section 41. The regulating support member 72 is formed in a block shape or thick plate shape with approximately the same width and height as the regulating member 71. The regulating member 71 and the regulating support member 72 face each other in the left-right direction of the pipe making device 20 (left-right direction in Figure 10). Preferably, the distance _D70 between the facing surfaces of the regulating member 71 and the regulating support member 72 is approximately equal to or slightly larger than the thickness _t10 of the strip-shaped member 10. Although detailed illustration is omitted, one of the regulating member 71 and the regulating support member 72 is fixed to the half housing 43 or 44 by a fixing means (not shown) such as bolting or welding. Both the regulating member 71 and the regulating support member 72 may be fixed to the half housing 43, 44.

11, connecting members 73 are provided at both ends in the width direction (left and right direction in FIG. 11) of the regulating unit 70. The connecting members 73 include a connecting bolt 73a that is spanned between the regulating member 71 and the regulating support member 72, and a nut 73b that is screwed onto the connecting bolt 73a. Each connecting member 73 connects the ends of the regulating member 71 and the regulating support member 72 on the same side in the width direction. This maintains the separation distance _D70 .

The restricting support member 72 covers the cutting member 50. The restricting member 72 has a recess 72b formed therein to avoid interference with the cutting member 50. As shown in Figs. 11 and 12, the cutting member 50 can slide relative to the restricting support member 72, which is fixed to the outer circumferential guide portion 41, in the opposing direction of the restricting member 71 and the restricting support member 72 (the up-down direction in Figs. 11 and 12).

In the second embodiment, the trailing band portion 19 is passed between the regulating member 71 and the regulating support member 72 before being introduced into the inlet 40a. At this time, the regulating member 71 presses the inner peripheral side surface 10a of the trailing band portion 19. As shown in FIG. 12, before the finishing process, the cutting member 50 is retracted so as to retract into the recess 72b of the regulating support member 72. This prevents the protruding strip 14b from being cut.

As shown in Figures 10 and 11, during the finishing process, the cutting member 50 is advanced to face the inlet 40a, and the blade 42 cuts the ridge 14b. At this time, even if the trailing band portion 19 has a curled tendency, the restricting member 71 holds the trailing band portion 19 from the inner periphery (the right side in Figure 10), preventing the trailing band portion 19 from separating from the cutting member 50. This ensures that the ridge 14b is cut.

<Modification 1 of the second embodiment (FIG. 13)>
In a modification of the second embodiment shown in Fig. 13, the cutting member 50 is fixed to a restrictive support member 72. The restrictive support member 72 is slidable integrally with the cutting member 50 in the opposing direction between the restrictive member 71 and the restrictive support member 72 (up and down direction in Fig. 13). Preferably, the restrictive member 71 is fixed to the inner circumference side guide portion 42 by a fixing means such as bolting or welding. The restrictive support member 72 is movable toward and away from the restrictive member 71.

As shown in FIG. 13, before the finishing process, the nut 73b is loosened to separate the regulating support member 72 from the regulating member 71. This allows the cutting member 50, which is integrated with the regulating support member 72, to be placed in a retracted position, and cutting of the protruding strip 14b can be avoided.

During the finishing process, the nut 73b is screwed in to bring the restricting support member 72 closer to the restricting member 72 (see FIG. 12). This allows the cutting member 50 to move forward and cut the ridge 14b.

<Modification 2 of the Second Embodiment (FIG. 14)>
In the modified example of the second embodiment shown in Fig. 14, the regulating unit 70 is composed of only the regulating member 71, and the regulating support member 72 (Figs. 10 to 12) is omitted. Even without the regulating support member 72, the regulating member 71 presses the trailing strip portion 19 from the inner periphery side, thereby preventing the trailing strip portion 19 from escaping from the cutting member 50 during the finishing process.

<Modification 3 of the second embodiment (FIG. 15)>
The shape of the regulating member 71 is not limited to a block shape or a plate shape.
In the modified example of Fig. 15(a), as shown in the same figure, the regulating member 71B includes a cylindrical roll 74 and a pair of rotation support parts 75 that rotatably support both ends of the cylindrical roll 74. The rotation axis of the roll 74 is oriented parallel to the axis _L30 of the pipe making section 30 (see Fig. 1). As shown in Fig. 15(b), the roll 74 comes into contact with the trailing belt portion 19 and is rotated as the trailing belt portion 19 is sent to the introduction section 40. This makes it possible to reduce friction between the regulating member 71B and the trailing belt portion 19.

<Fourth Modification of the Second Embodiment (FIG. 16)>
16, the restricting member 71C is formed in a frame or ladder shape. In detail, the restricting member 71C includes upper and lower multiple stages (two stages in this case) of beams 76, 77 and a pair of pillars 78 supporting both ends of the beams 76, 77.

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 cutting member 50 may be removed from the pipe making apparatus 20 before the finishing process, and then attached to the introduction section 40 during the finishing process.

The present invention can be applied, for example, to the rehabilitation of aging sewer pipes.

1. Pipeline (rehabilitation target)
3 Rehabilitation pipe 3a, 3g Pipe portion subjected to variable circumferential length treatment 3b Large diameter pipe portion 3c Cone portion 3d Small diameter pipe portion 3e Starting side pipe end 3i Terminal cone portion 4 Starting manhole 10 Belt-shaped member 10a Inner peripheral side surface 13 Edge portion 14 Edge portion 14a of 1 First convex strip 14b Second convex strip (part of convex strip)
19 Trailing belt portion 19c Cutting start portion 20 Push-type pipe making device (expansion pipe making device)
Reference Signs List 30 Pipe making section 31 Outer circumference regulating body 40 Introduction section 40a Introduction port 41 Outer circumference guide section 42 Inner circumference guide section 50 Cutting member 51 Base section 51b Long hole 52 Blade section 52a Blade tip 53 Reinforcing wall 54 Mounting bolt 61 Cutting wire 61c Pull-out folded-back section 70 Regulating unit 71 Regulating members 71B, 71C Regulating members 72 Regulating support member 73 Connecting member 74 Rolls 76, 77 Beam section

Claims (6)

A pipe manufacturing apparatus for expanding a circumferential length of a pipe portion that has been subjected to a circumferential length variable treatment of a spiral pipe that is disposed in a pipeline to be rehabilitated, comprising:
a pipe manufacturing section that forms a new pipe end of the rehabilitating pipe by winding a strip-shaped member constituting the rehabilitating pipe in a spiral direction and fitting adjacent edge portions of the strip-shaped member one turn apart into a recessed and projecting engagement, and that screws the pipe end in the spiral direction to obtain an expansion force for the pipe portion;
an introduction section having an introduction port for introducing a subsequent strip portion of the strip member connected to the tube end into the tube making section;
a cutting member provided in the introduction section so as to be movable forward and backward or detachable in the introduction section so as to face the introduction port, the cutting member cutting a part of the projection for engagement formed on one edge portion of the belt-shaped member;
A pipe manufacturing device for expanding rehabilitated pipes. The pipe making device according to claim 1, wherein the cutting member includes a base portion attached to the introduction portion and a blade portion protruding from the base portion toward the upstream side in the direction in which the trailing band portion is introduced. The base has a long hole through which a bolt for attachment to the introduction portion is inserted,
3. A pipe making apparatus according to claim 2, wherein the width direction of the trailing band portion and the longitudinal direction of the long hole are perpendicular to each other. the introduction portion has an outer circumferential guide portion to which the protrusion of the trailing band portion is directed and an inner circumferential guide portion to which the inner circumferential side surface of the trailing band portion is directed, and the introduction port is formed between these guide portions;
A pipe making apparatus according to any one of claims 1 to 3, wherein the cutting member is provided on the outer circumferential guide portion. The pipe making device according to claim 4, wherein the inner circumferential guide portion is provided with a restricting member that presses the inner circumferential side surface of the trailing band portion so as to protrude upstream of the cutting member in the direction in which the trailing band portion is introduced. A pipe manufacturing apparatus as described in claim 5, in which a regulating support member is provided in the outer circumferential guide portion so as to face the regulating member, and the ends of the regulating support member and the regulating member on the same side in the width direction are connected to each other by a connecting member.

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