JP7797295B2 - Profile removal method in pipe making process and self-propelled pipe making machine - Google Patents

Description

The present invention relates to a method for disengaging a profile during the process of producing a spiral pipe from a strip-shaped profile using a self-propelled pipe making machine, and to a self-propelled pipe making machine suitable for this method.

A technology is known for using a self-propelled pipe making machine to produce a helical pipe from a strip-shaped profile that has a first fitting portion on one side of the width and a second fitting portion on the other side that is complementary in shape to the first fitting portion. A self-propelled pipe making machine has a drive unit that feeds out the profile as a basic component. The drive unit feeds the subsequent profile obliquely toward the profile at the beginning of the helical pipe being produced, causing the second fitting portion of the subsequent profile to engage with the first fitting portion of the beginning profile, and the self-propelled pipe making machine uses the reaction force generated by the feeding of the profile to self-propel in a spiral.

Patent Document 1 discloses an inner peripheral presser and an outer peripheral presser as restraint means for assisting in the fitting of profiles during pipe production. At a predetermined fitting position away from the drive unit in the profile feed direction, these presser members press the leading profile and the trailing profile of the spiral pipe from the inside and outside in the pipe diameter direction, while fitting the first fitting portion and the second fitting portion together.

JP 2021-49723 A

During the process of producing helical pipe using a self-propelled pipe making machine, situations can arise where the machine hits a step or becomes unable to continue producing the pipe. In such cases, it is necessary to unwind the profile from the front of the helical pipe during production and temporarily move the front position of the helical pipe back. To do this, the drive unit is rotated in reverse, pulling the subsequent profile back from the front of the helical pipe toward the drive unit, and this pulling force disengages the first and second mating portions. However, if the disengagement is performed while the holding tool is still restraining the front and subsequent profiles in the specified mating position, as was done during pipe production, a large load is applied to the first and second mating portions, which may cause damage. If the pipe making process is resumed using a profile with a damaged mating portion, a poorly fitted area will occur in the helical pipe.

The present invention has been made to solve the above-mentioned problems, and provides a method for removing a profile from a pipe making process, comprising providing a strip-shaped profile having a first fitting portion on one side in the width direction and a second fitting portion on the other side that is complementary in shape to the first fitting portion, and a self-propelled pipe making machine for producing the profile into a helical pipe, the self-propelled pipe making machine comprising a drive unit that feeds out the profile, and restraining means disposed away from the drive unit in the profile feed direction, and in the pipe making process, a profile located at the front of the helical pipe being produced and a subsequent profile fed out from the drive unit are restrained from each other. The first engaging portion and the second engaging portion are engaged with each other while at least one of the profiles is restrained at a predetermined engaging position by the restraining means, and the device is self-propelled by utilizing the reaction force associated with the profile being fed out.During the pipe making process, the driving unit is driven in the direction opposite to the profile feeding direction to pull the subsequent profile into the driving unit, and when the second engaging portion of the subsequent profile is removed from the first engaging portion of the profile at the head of the spiral pipe, the restraint on the profile by the restraining means is loosened or released.

According to the above-described method, when the profile is unwound from the front of the spiral pipe, the restraining means can be loosened or released to move the unwound position farther from the drive unit than the fitting position during pipe production, thereby reducing the load on the fitting portion. As a result, damage to the fitting portion can be avoided.

In one specific example of the method of the present invention, the self-propelled pipe making machine further comprises an inner support frame rotatably supported on the body of the drive unit or on the tip of the inner frame extending from the drive unit in the feed direction , and an adjustment mechanism for adjusting the angle of the inner support frame, and an inner clamp as the restraint means is supported on the inner support frame, and during pipe making, the inner clamp holds the subsequent profile from the inside in the pipe diameter direction at the predetermined fitting position, and during the fitting and unfitting, the inner support frame is rotated by the adjustment mechanism, thereby retracting the inner clamp further inward in the pipe diameter direction than its position during pipe making.

In the above-mentioned specific example, preferably, the inner support frame is rotatably connected to the tip of the inner frame extending from the drive unit, and the adjustment mechanism is provided between the inner frame and the inner support frame.

In another specific example of the method of the present invention, the self-propelled pipe making machine further includes an inner support frame removably supported on the body of the drive unit, and an inner hold-down tool serving as the restraint means is supported on the inner support frame. During pipe making, the inner hold-down tool holds the subsequent profile from the inside in the pipe diameter direction at the predetermined fitting position, and during the fitting removal, the inner support frame supporting the inner hold-down tool is removed from the body.

In yet another specific example of the method of the present invention, the self-propelled pipe making machine further comprises an outer support frame rotatably connected to the body of the drive unit and extending in the feed direction, and an adjustment mechanism for adjusting the angle of the outer support frame, and an outer clamp as the restraint means is provided at the tip of the outer support frame, and during pipe making, the outer clamp presses the profile at the beginning of the spiral pipe from the outside in the pipe diameter direction at the predetermined fitting position, and during the fitting and unfitting, the outer support frame is rotated by the adjustment mechanism, thereby retracting the outer clamp further outward in the pipe diameter direction than its position during pipe making.

In the above specific example, preferably, the first fitting portion is a female fitting portion that protrudes radially outward from the pipe, and the outer retainer has a support groove that holds the female fitting portion.

In the above specific example, preferably, the self-propelled pipe making machine further comprises an inner frame rotatably connected to the body of the drive unit, extending in the feed direction and positioned radially inward of the outer support frame, and a passage formed between the outer support frame and the inner frame through which the profile fed from the drive unit passes during pipe making; the adjustment mechanism is provided between the outer support frame and the inner frame; and during the fitting and unfitting, the adjustment mechanism rotates the outer support frame and the inner frame to widen the passage compared to when making pipe.

Another aspect of the present invention is a self-propelled pipe making machine for producing a band-shaped profile into a helical pipe, the band-shaped profile having a first fitting portion on one side in the width direction and a second fitting portion on the other side that is complementary in shape to the first fitting portion, and is characterized by comprising: a drive unit that feeds out the profile during pipe production; an inner frame connected to the body of the drive unit and extending in the feed direction; an inner support frame rotatably connected to the inner frame; an inner presser supported by the inner support frame that holds down the subsequent profile from the inside in the radial direction of the helical pipe at a predetermined mating position when mating the second fitting portion of the subsequent profile with the first fitting portion of the leading profile of the helical pipe during pipe production; and an adjustment mechanism provided between the inner frame and the inner support frame that adjusts the angle of the inner support frame.

Another aspect of the present invention is a self-propelled pipe making machine for producing a band-shaped profile into a helical pipe, the band-shaped profile having a first fitting portion on one side in the width direction and a second fitting portion on the other side that is complementary in shape to the first fitting portion, the machine comprising: a drive unit that feeds out the profile during pipe production; an outer support frame that is rotatably connected to the body of the drive unit and extends in the feed direction; an outer presser that is provided at the tip of the outer support frame and that presses the leading profile from the outside in the pipe diameter direction of the helical pipe at a predetermined mating position when mating the second fitting portion of a subsequent profile with the first fitting portion of the leading profile of the helical pipe during pipe production; an inner frame that is rotatably connected to the body of the drive unit and extends in the feed direction and is positioned radially inward of the outer support frame; a passage formed between the outer support frame and the inner frame through which the profile fed from the drive unit passes during pipe production; and an adjustment mechanism that is provided between the outer support frame and the inner frame and that adjusts the width of the passage.

According to the present invention, damage to the fitting portion of the profile can be avoided when unwinding the profile from the beginning of the spiral pipe during pipe manufacturing.

This is a cross-sectional view showing the profile of the leading edge of a rehabilitating pipe just before the fitting position and the subsequent profile during the pipe manufacturing process of a rehabilitating pipe inside an existing pipe. This is a cross-sectional view showing the profile of the leading edge of the rehabilitating pipe and the subsequent profile at the fitting position during the pipe manufacturing process of the same rehabilitating pipe. This is a schematic vertical cross-sectional view showing the state in which the self-propelled pipe making machine hits a step in the existing pipe during the pipe making process for the same rehabilitation pipe. This is a schematic vertical cross-sectional view showing the state in which the front end of the rehabilitating pipe is retracted from the abutted position by unwinding the profile from the front end of the rehabilitating pipe during the pipe manufacturing process of the same rehabilitating pipe. This is a side view showing the state in which a profile is being fitted using a self-propelled pipe making machine according to one embodiment of the present invention in the pipe making process of the same rehabilitation pipe. 10 is a side view showing a state in which one aspect of the profile fitting and unfitting method of the present invention is being performed using the self-propelled pipe making machine. FIG. FIG. 3B is an explanatory diagram showing the magnitude of the force required for disengagement when disengagement is performed while the profile is restrained by the restraining means in the same manner as during pipe manufacturing, i.e., as in FIG. 3A. FIG. 3C is an explanatory diagram showing the magnitude of the mating/unmating force when mating/unmating is performed in the state shown in FIG. 3B . 3B, showing another embodiment of the profile fitting/disengaging method of the present invention. FIG. 3C is a side view showing the state when the self-propelled pipe making machine is positioned on the side of the existing pipe in the fitting and unfitting method shown in FIG. 3B. FIG. 3B, showing another embodiment of the profile fitting/disengaging method of the present invention. FIG.

<Profile configuration>
1A and 1B, a resin profile 100 used in the production of a spiral pipe will be described. As shown in Fig. 1A, the profile 100 is strip-shaped and includes a main strip plate portion 110 with a flat surface 111, a female fitting portion 120 (first fitting portion) formed on one widthwise edge of the main strip plate portion 110, a male fitting portion 130 (second fitting portion) formed on the other widthwise edge, and a reinforcing rib 140 formed on the other surface 112 of the main strip plate portion 110. In this embodiment, a metal reinforcing member 141 is embedded in the reinforcing rib 140.

As described below, when the profile 100 is spirally wound into a rehabilitated pipe (helical pipe) using a self-propelled pipe making machine, one surface 111 of the main band plate portion 110 is positioned on the inside of the rehabilitated pipe in the pipe diameter direction, and the other surface 112 is positioned on the outside of the pipe diameter direction. The female fitting portion 120 protrudes outward in the pipe diameter direction of the rehabilitated pipe and has a fitting groove 121 with an arrow-shaped cross section that opens on the inside of the pipe diameter direction. The male fitting portion 130 also protrudes outward in the pipe diameter direction and has a cross-sectional shape complementary to the fitting groove 121. As shown in Figure 1B, the female fitting portion 120 and male fitting portion 130 of the spirally wound profile 100, which is one turn away from the other, are fitted together.

<Configuration of self-propelled pipe making machine>
3A, the self-propelled pipe making machine 1 used in this embodiment includes a drive unit 10 that feeds out a profile 100 when making a rehabilitating pipe 5, an inner frame 20 whose base end is connected to a body 11 of the drive unit 10 and extends in the direction of feeding the profile 100, an inner support frame 30 that is rotatably connected to the tip of the inner frame 20 (rotatable about a rotation axis extending in the pipe axial direction of the rehabilitating pipe 5), and an outer support frame 40 whose base end is connected to the body 11 of the drive unit 10 and extends in the direction of feeding the profile 100. The inner frame 20 and the inner support frame 30 are positioned radially inward of the outer support frame 40.

The drive unit 10 has a body 11, multiple drive rollers 12 rotatably supported by the body 11 (rotatable around a rotation axis extending in the pipe axial direction), and a hydraulic motor (not shown) that drives these drive rollers 12 in forward and reverse rotation directions. The profile 100 is fed out by rotating the drive rollers 12 forward in the direction of the arrow in Figure 3A while the profile 100 is sandwiched between the drive rollers 12.

A mating roller 35 (inner presser; restraint means) is supported at the tip of the inner support frame 30 so that it can rotate around a rotation axis extending in the pipe axis direction. An adjustment mechanism 50 is provided between the tip of the inner frame 20 and the inner support frame 30. This adjustment mechanism 50 allows the angle of the inner support frame 30 relative to the inner frame 20 to be adjusted. In this embodiment, the adjustment mechanism 50 includes a screw 51, a threaded member 52 that is rotatably supported at the tip of the inner frame 20 and threadably engages with the screw 51, and a retaining member 53 that is rotatably supported at the tip of the inner support frame 30 and holds the tip of the screw 51. The retaining member 53 allows the screw 51 to be turned.

A passage 60 is formed between the inner frame 20 and the outer support frame 30, through which the profile 100 sent out from the drive unit 10 passes. A fitting guide 45 (external presser; restraint means) is provided at the tip of the outer support frame 40. As shown in Figure 1B, this fitting guide 45 has a support groove 45a for accommodating and holding the female fitting portion 120.

The base ends of the inner frame 20 and outer support frame 30 have play relative to the body 11 of the drive unit 10, allowing them to rotate around a rotation axis extending in the pipe axial direction. An adjustment mechanism 70 is provided between the inner frame 20 and the outer support frame 40. In this embodiment, the adjustment mechanism 70 includes a screw 71, a threaded member 72 fixed to the inner frame 20 and threadably engaging with the screw 71, and a retaining member 73 fixed to the outer support frame 40 and holding the tip of the screw 71. The retaining member 73 allows the screw 71 to be turned.

<Outline of the pipe manufacturing process>
In this embodiment, a rehabilitation pipe 5 (spiral pipe) is lined around the inner periphery of an existing pipe 6, such as an aged sewer pipe, to rehabilitate the existing pipe 6. The existing pipe 6 is arranged so as to connect a starting manhole located on the left side of Fig. 2A and a destination manhole located on the right side (neither of which is shown).

As shown in Figure 2A, the rehabilitated pipe 5 is obtained by spirally producing a profile 100 using a self-propelled pipe production machine 1. More specifically, the profile 100 is supplied from a drum located above ground in the starting manhole, through the starting manhole, through the rehabilitated pipe 5 being produced, and to the self-propelled pipe production machine 1 located at the beginning of the rehabilitated pipe 5. The self-propelled pipe production machine 1 produces the rehabilitated pipe 5 by spirally winding the profile 100 and engaging the female fitting portion 120 of the profile 100 located at the beginning of the rehabilitated pipe 5 with the male fitting portion 130 of the following profile 100 (one turn away). The self-propelled pipe production machine 1 continues to produce the pipe at the beginning of the rehabilitated pipe 5 while traveling in a spiral. The produced rehabilitated pipe 5 extends toward the destination manhole.

<Adjustment of the self-propelled pipe making machine during the pipe making process>
During the pipe manufacturing process, the positions of the components are adjusted by the adjustment mechanisms 50 and 70 as shown in Figure 3A. This will be described in detail below.

The adjustment mechanism 70 adjusts the width of the passage 60 between the inner frame 20 and the outer support frame, allowing the profile 100 from the drive unit 10 to be stably fed toward the mating position P0 (see Figure 3A). By adjusting this adjustment mechanism 70, as shown in Figure 1B, the mating guide 45 can hold the female mating portion 120 of the profile 100 located at the beginning of the rehabilitated pipe 5 during pipe production in the support groove 45a at the mating position P0, and can also press the profile 100 from the outside in the radial direction of the pipe.

The adjustment mechanism 50 adjusts the angle of the inner support frame 30, so that at the mating position P0, the mating roller 35 can press the surface 111 of the main strip portion 110 of the subsequent profile 100 from the inside in the pipe diameter direction so that it is flush with the surface 111 of the profile 100 located at the beginning of the rehabilitated pipe 5 during pipe production (see Figure 1B).

<Function of the self-propelled pipe making machine in the pipe making process>
As shown in FIG. 3A , the drive roller 12 is rotated forward to feed the profile 100 to the right. The fed subsequent profile 100 passes through the passage 60 toward the front end of the rehabilitating pipe 5, and at the fitting position P0, the male fitting portion 130 fits into the fitting groove 121 of the female fitting portion 120 of the profile 100 located at the front end of the rehabilitating pipe 5 during pipe production. At this time, the fitting roller 35 presses the subsequent profile 100 from the inside in the pipe diameter direction, and the fitting guide 45 presses the profile 100 located at the front end of the rehabilitating pipe 5 from the outside in the pipe diameter direction at the fitting position P0. This ensures that the female fitting portion 120 and the male fitting portion 130 fit together reliably at the fitting position P0. Furthermore, the female fitting portion 120 is housed and held in the support groove 45a of the fitting guide 45, further enhancing the smoothness of the fitting process.

The self-propelled pipe making machine 1 moves in a spiral (clockwise in Figure 3A) using the reaction force generated by the drive unit 10 as the following profile 100 is fed out, thereby allowing the machine to continue making the rehabilitated pipe 5 while supplying the profile 100 to the beginning of the rehabilitated pipe 5 that is currently being made.

<Suspension of pipe production and restart of pipe production>
As shown in Figure 2A, if there is an obstacle such as a step 6a on the existing pipe 6, the self-propelled pipe making machine 1 will hit the step 6a, preventing it from moving further and making any more pipe. In this case, as shown in Figure 1B, a predetermined amount of profile 100 is unwound from the beginning of the rehabilitating pipe 5 in the middle of making the pipe, and the beginning of the rehabilitating pipe 5 is temporarily moved back from the step 6a. After this, the unwound profile 100 is used to make a pipe with a smaller diameter than the already made rehabilitating pipe 5, while climbing over the step 6a. Then, as in the previous operation, the machine continues making a rehabilitating pipe 5 with a diameter corresponding to the inner diameter of the existing pipe 6.

<How to detach>
As described above, in the process of unwinding the profile 100 from the front end of the rehabilitating pipe 6 during pipe production, the drive roller 12 of the drive unit 10 is reversed to pull the following profile 100 toward the drive unit 10. As a result, the self-propelled pipe making machine 1 moves in the opposite direction to that during pipe production while disengaging the male fitting portion 130 of the following profile 100 from the female fitting portion 120 of the profile 100 at the front of the rehabilitating pipe 5.

During the above-mentioned disengagement, if the components of the self-propelled pipe making machine 1 are maintained in the same position as during pipe making, as shown in Figure 3A, and the drive roller 12 of the drive unit 10 is reversed while the profile 100 is constrained from the radially inner and outer sides at the mating position P0 by the mating rollers 35 and mating guides 45, a large load will be placed on the mating portions 120, 130, which could result in damage. For example, damage could occur near the free end of the female mating portion 120 (near the upper end of the right side in Figures 1A and 1B) or the neck of the male mating portion 130. Once the mating portions 120, 130 are damaged, they cannot be re-engaged in good condition.

Therefore, in one embodiment of the disengagement method of the present invention, as shown in FIG. 3B, the screw 51 of the adjustment mechanism 50 is turned to move the inner support frame 30 closer to the inner frame 20, thereby retracting the engagement rollers 35 radially inward in the pipe direction. This releases the subsequent profile 100 from the engagement rollers 35 at engagement position P0, thereby disengaging the male engagement portion 130 of the subsequent profile 100 from the female engagement portion 120 of the leading profile 100 of the rehabilitating pipe 5 at position P1, which is further away from engagement position P0 in the counterclockwise direction from the drive unit 10 (the self-propelled direction of the self-propelled pipe making machine 1 during disengagement). As a result, the load on the engagement portions 120, 130 during disengagement can be reduced, preventing damage to them.

The principle of preventing damage to the fitting portions 120, 130 will be described with reference to Figures 4A and 4B. As shown in Figure 4A, when the fitting roller 35 and the fitting guide 45 maintain the same positions as during pipe manufacturing (the positions shown in Figure 3A), and the drive unit 10 is reversed to perform unfitting while restraining the profile 100 at the fitting position P0, the unfitting position is equal to the fitting position P0. In this case, the unfitting position P0 is close to the drive unit 10, and the angle Θ0 between the direction of the tensile force F of the profile 100 starting from the unfitting position P0 and the tangent to the rehabilitating pipe 5 is relatively large. Therefore, the tangential component force _FH0 is small, and the component force _FN0 in the direction perpendicular to the tangential direction, i.e., the unfitting force, is large, so a large load acts on the fitting portions 120, 130.

4B , when the constraint by the fitting roller 35 is relaxed, the disengagement position P1 becomes farther from the drive unit 10 than the fitting position P0. In this case, the angle Θ1 between the direction of the tensile force F of the profile 100 starting from the disengagement position P1 and the tangent to the rehabilitating pipe 5 becomes smaller. Therefore, the component force _FH1 in the tangential direction becomes large and the component force _FN1 in the direction perpendicular to the tangential direction, i.e., the disengagement force, becomes small. This reduces the load on the fitting portions 120, 130, and prevents damage to the fitting portions 120, 130.

<Other aspects of the mating/unmating method>
Figure 5 shows another embodiment of the fitting/unfitting method. The basic configuration is the same as that shown in Figure 3A, but the inner support frame 30 (see Figure 3A) is removable from the inner frame 20 (and therefore from the body 11). The operation during pipe manufacturing is the same as that described above. In the fitting/unfitting process, the inner support frame 30 is removed from the inner frame 20 together with the fitting rollers 35, and the constraint of the profile 100 from the inside in the pipe radial direction by the fitting rollers 35 is released. This embodiment also provides the same effects as the first embodiment.

In the above embodiment, the inner support frame 30 may be non-rotatably and removably connected to the inner frame 20, thereby eliminating the adjustment mechanism 50, or the inner support frame 30 may be removably connected directly to the body 11.

<Still another aspect of the mating/unmating method>
It is conceivable that simply retracting the engaging rollers 35 radially inward as shown in Figure 3B or removing the engaging rollers 35 as shown in Figure 5 may not be sufficient. For example, in a situation where the self-propelled pipe making machine 1 is positioned to the side of the rehabilitating pipe 5 and the disengagement position is located below the drive unit 10 as shown in Figure 6, gravity G of the drive unit 10 acts on the profile (not shown in this figure) being pulled into the drive unit 10, exerting a force _FG radially outward in the pipe, causing the profile to bend in the same direction. As a result, the disengagement position approaches the drive unit 10, weakening the effect of retracting or removing the engaging rollers 35. Furthermore, if the fitting guides are lifted radially inward by an error during assembly, the disengagement position will also approach the drive unit 10.

If the above situation is anticipated, as shown in Figure 7, the mating rollers 35 are retracted or removed, and the screws 71 of the adjustment mechanism 70 are turned to rotate the inner frame 20 and outer support frame 40 as shown by the arrows, widening the passage 60. For example, the inner frame 20 and outer support frame 40 are rotated to the limit of play at the connection between the body 11 and the inner frame 20. This displaces the mating guide 45 radially outward from the position where the female mating portion 120 is housed and held, loosening the radially outward constraint of the mating guide 45, thereby moving the unmating position away from the drive unit 10. Retracting the inner frame 20 radially inward to widen the passage 60 also loosens the constraint on the profile 100.

The present invention is not limited to the above embodiment, and various modifications can be made as long as they do not contradict the spirit of the invention. For example, the outer support frame 40, outer clamp 45, and adjustment mechanism 70 may be omitted from the self-propelled pipe making machine 1 described above. In this case, the profile 100 is only constrained from the inside in the pipe diameter direction during pipe making, and the constrained state can be substantially released by retracting the engagement roller 35 during fitting and unfitting. Furthermore, the inner support frame 30, inner clamp 35, and adjustment mechanism 50 may be omitted from the self-propelled pipe making machine 1. In this case, the profile is only constrained from the outside in the pipe diameter direction during pipe making, and the engagement guide 45 is retracted toward the outside in the pipe diameter direction during fitting and unfitting.

In the self-propelled pipe making machine 1 described above, the inner frame 20 may be fixed non-rotatably to the body 11 of the drive unit 10, with only the outer support frame 40 rotatably connected. In this case, when engaging or disengaging, only the outer support frame 40 is rotated radially outward in the pipe direction by the adjustment mechanism 70.

In the above-described embodiment, the inner support frame is rotatably connected to the body of the drive unit via the inner frame, but it may also be rotatably connected directly to the body. In this case, an adjustment mechanism is provided between the body and the inner support frame.

The spiral pipe manufactured using this invention can be used not only to rehabilitate existing pipes that have deteriorated, but also as a tunnel lining.

The present invention can be applied to the technology of manufacturing spiral pipes from strip-shaped profiles.

1 Self-propelled pipe making machine 5 Rehabilitation pipe (spiral pipe)
10 Drive unit 11 Body 20 Inner frame 30 Inner support frame 35 Fitting roller (inner pressing tool; restraining means)
40 Outer support frame 45 Fitting guide (outer retainer; restraining means)
45a Support groove 50 Adjustment mechanism 60 Passage 70 Adjustment mechanism 100 Profile 120 Female fitting portion (first fitting portion)
130 Male fitting portion (second fitting portion)

Claims (9)

a strip-shaped profile having a first fitting portion on one side in the width direction and a second fitting portion on the other side having a shape complementary to the first fitting portion; and a self-propelled pipe making machine for making the profile into a helical pipe;
The self-propelled pipe making machine comprises a drive unit that feeds out a profile, and a restraining means disposed away from the drive unit in the profile feeding direction, and in the pipe making process, the first fitting portion and the second fitting portion are fitted together while at least one of the profile located at the front of the spiral pipe being made and the subsequent profile fed out from the drive unit is restrained by the restraining means at a predetermined fitting position, and the machine is self-propelled by utilizing the reaction force accompanying the feeding of the profile,
A method for removing profiles from a pipe making process, characterized in that, during the pipe making process, the drive unit is driven in a direction opposite to the profile feed direction to pull the subsequent profile into the drive unit, and when removing the second fitting portion of the subsequent profile from the first fitting portion of the profile at the head of the spiral pipe, the constraint on the profile by the constraint means is loosened or released. The self-propelled pipe making machine further comprises an inner support frame rotatably supported on the body of the drive unit or on the tip of an inner frame extending from the drive unit in the feed direction , and an adjustment mechanism for adjusting the angle of the inner support frame, and an inner presser as the restraining means is supported on the inner support frame,
During pipe manufacturing, the inner presser holds the subsequent profile at the predetermined fitting position from the inside in the pipe diameter direction,
A method for removing a profile from a pipe making process as described in claim 1, characterized in that when removing the fitting, the inner support frame is rotated by the adjustment mechanism, thereby retracting the inner holding tool radially inward from its position during pipe making. A method for removing a profile from a pipe making process as described in claim 2, characterized in that the inner support frame is rotatably connected to the tip of the inner frame extending from the drive unit, and the adjustment mechanism is provided between the inner frame and the inner support frame. the self-propelled pipe making machine further comprises an inner support frame detachably supported on the body of the drive unit, and an inner presser as the restraining means is supported on the inner support frame;
During pipe manufacturing, the inner presser holds the subsequent profile at the predetermined fitting position from the inside in the pipe diameter direction,
2. The method for disengaging a profile in a pipe manufacturing process according to claim 1, wherein the inner support frame supporting the inner presser is removed from the body when disengaging the profile. The self-propelled pipe making machine further comprises an outer support frame rotatably connected to the body of the drive unit and extending in the feed direction, and an adjustment mechanism for adjusting the angle of the outer support frame, and an outer presser as the restraining means is provided at the tip of the outer support frame,
During pipe manufacturing, the outer presser presses the profile at the leading end of the spiral pipe from the outside in the pipe diameter direction at the predetermined fitting position,
A method for removing a profile from a pipe making process as described in claim 1, characterized in that when removing the fitting, the outer support frame is rotated by the adjustment mechanism, thereby retracting the outer clamping tool radially outward from its position during pipe making. A method for removing a profile from a pipe manufacturing process as described in claim 5, characterized in that the first fitting portion is a female fitting portion that protrudes radially outward from the pipe, and the outer presser has a support groove that holds the female fitting portion. The self-propelled pipe making machine further comprises an inner frame rotatably connected to the body of the drive unit, extending in the feed direction and positioned radially inward of the outer support frame, and a passage formed between the outer support frame and the inner frame through which a profile fed from the drive unit passes during pipe making,
A method for disengaging a profile during a pipe manufacturing process as described in claim 5 or 6, characterized in that the adjustment mechanism is provided between the outer support frame and the inner frame, and when disengaging, the adjustment mechanism rotates the outer support frame and the inner frame to widen the passage compared to when manufacturing the pipe. A self-propelled pipe making machine for making a belt-shaped profile into a helical pipe, the belt-shaped profile having a first fitting portion on one side in a width direction and a second fitting portion on the other side having a shape complementary to the first fitting portion,
a drive unit for feeding the profile during pipe making;
an inner frame connected to a body of the drive unit and extending in the feed direction;
an inner support frame rotatably connected to the inner frame;
an inner presser supported by the inner support frame, which presses the subsequent profile from the inside in the pipe diameter direction of the helical pipe at a predetermined fitting position when fitting the second fitting portion of the subsequent profile into the first fitting portion of the leading profile of the helical pipe during pipe manufacturing;
an adjustment mechanism provided between the inner frame and the inner support frame for adjusting an angle of the inner support frame;
A self-propelled pipe making machine comprising: A self-propelled pipe making machine for making a belt-shaped profile into a helical pipe, the belt-shaped profile having a first fitting portion on one side in a width direction and a second fitting portion on the other side having a shape complementary to the first fitting portion,
a drive unit for feeding the profile during pipe making;
an outer support frame rotatably connected to a body of the drive unit and extending in the feed direction;
an outer presser provided at the tip of the outer support frame, which presses the leading profile from the outside in the pipe diameter direction of the helical pipe at a predetermined fitting position when fitting the second fitting portion of a subsequent profile into the first fitting portion of the leading profile of the helical pipe during pipe manufacturing;
an inner frame rotatably connected to a body of the drive unit, extending in the delivery direction, and disposed radially inward of the outer support frame;
a passage formed between the outer support frame and the inner frame, through which a profile fed from the driving unit passes during pipe making;
an adjustment mechanism provided between the outer support frame and the inner frame for adjusting the width of the passage;
A self-propelled pipe making machine comprising: