JP7486380B2 - Spiral tube forming device - Google Patents

Description

The present invention relates to a helical pipe forming device that forms a helical pipe from a strip-shaped material, and in particular to a helical pipe forming device suitable for rehabilitating deteriorated existing pipes.

A method of rehabilitating an existing pipe, such as an aged sewer pipe, by lining the inner circumference of the existing pipe with a rehabilitation pipe is known (see Patent Documents 1 and 2, etc.). The rehabilitation pipe is made of a helical pipe, for example, made by winding a strip-shaped member in a helical shape. The helical pipe is manufactured by a pipe manufacturing machine.

This type of pipe making machine is equipped with a pair of pinch rollers consisting of an outer roller and an inner roller. Usually, the outer peripheral surface of the outer roller is formed with an uneven pattern such as a knurl. In addition, two or more pairs of pinch rollers are arranged side by side. The belt portion of the unmade pipe on the belt-shaped member is clamped by these pinch roller pairs, and by rotating these rollers with a hydraulic motor, the belt portion of the unmade pipe is sent to the made portion, i.e., the helical pipe. In this way, the helical pipe is stretched and made into a pipe.

The strip-shaped material (strip portion of unmade pipe) is inserted from above ground into a manhole and is supplied from there to a pipe making machine in an existing pipe. When the strip-shaped material is highly rigid, the supply operation becomes difficult. In such cases, a curl forming machine is used in combination (see Patent Document 2, etc.). The curl forming machine, like the pipe making machine, is equipped with two (multiple) pairs of pinch rollers and a hydraulic motor. The outer rollers of each pinch roller pair of the curl forming machine are formed with a knurled or other uneven pattern. The strip-shaped material is given a curl (curvature) as it passes through the two pinch roller pairs of the curl forming machine. The strip-shaped material after being given the curl is supplied to the pipe making machine.

Patent No. 6518324 Japanese Patent No. 6329260

When a helical tube is produced from a strip-shaped member using such a helical tube forming device including a tube making machine or a curl forming machine, a mark (scratches) of the uneven pattern may be formed on the driving surface of the strip-shaped member (the surface in contact with the outer roller) by the outer roller of the preceding pinch roller pair. The strip-shaped member is then introduced into the succeeding pinch roller pair. At this time, if the uneven pattern of the succeeding outer roller matches the uneven pattern of the preceding outer roller, the succeeding outer roller may rotate idly, and the driving force may not be transmitted to the strip-shaped member.
In consideration of the above circumstances, the present invention aims to prevent the pinch roller pairs in the subsequent stages from spinning freely when a spiral tube is formed using a spiral tube forming device including multiple pinch roller pairs, even if a mark of an uneven pattern pressed by the pinch roller pairs in the preceding stages is formed on the strip-shaped material, and to ensure that driving force is transmitted to the strip-shaped material.

In order to solve the above problems, the present invention provides a helical tube forming apparatus for forming a helical tube from a strip-shaped material, comprising:
The device is characterized in that it is provided with at least two pairs of pinch rollers arranged side by side on a path along which the strip-shaped member is assembled into the spiral tube, and which clamp and pull in or send out the strip-shaped member, and each of the two pairs of pinch rollers is formed with an uneven pattern so that the pressure marks that may be formed on the strip-shaped member do not coincide with each other.

When forming a spiral tube, the convex parts of the uneven pattern are pressed strongly against the strip-shaped member, increasing the friction between the pinch roller pair and the strip-shaped member. The uneven pattern may leave marks (scratches) on the strip-shaped member. The marks left by the concave parts of the uneven pattern become convex parts, and the marks left by the convex parts of the uneven pattern become concave parts. The marks left by the pinch roller pair at the relatively front stage and the marks left by the pinch roller pair at the relatively rear stage do not match each other. That is, the places where these marks are formed on the strip-shaped member, the uneven pattern, the depth of the concave parts, etc. are different from each other. Therefore, even if the pinch roller pair at the front stage leaves marks on the strip-shaped member, the pinch roller pair at the rear stage can be prevented from rotating idly. This ensures that the driving force from the pinch roller pair at the rear stage is transmitted to the strip-shaped member. As a result, the spiral tube can be reliably manufactured by the spiral tube forming device.

The uneven pattern is preferably a knurled pattern formed by knurling.
It is preferable that the concave and convex patterns of the two pinch roller pairs are formed on outer circumferential portions of the rollers that do not correspond to each other.
"Not corresponding to each other" means that the portion where the uneven pattern of one pinch roller pair is arranged does not correspond to the portion where the uneven pattern of the other pinch roller pair is arranged. Therefore, the uneven pattern of one pinch roller pair and the uneven pattern of the other pinch roller pair are pressed against different places on the belt-shaped member. This reliably prevents the pinch roller pair in the rear stage from rotating idly due to the pressing marks of the previous stage.

One pinch roller pair may be a pinch roller pair in the front stage and the other pinch roller pair may be a pinch roller pair in the rear stage, or one pinch roller pair may be a pinch roller pair in the rear stage and the other pinch roller pair may be a pinch roller pair in the front stage.
It is preferable that each pinch roller pair has an inner roller that faces the portion of the strip-shaped member facing the inner circumference of the helical tube, and an outer roller that faces the portion of the strip-shaped member facing the outer circumference of the helical tube.
In a "mutually non-corresponding" embodiment, the uneven pattern of one pinch roller pair may be formed on the inner roller, and the uneven pattern of the other pinch roller pair may be formed on the outer roller. This causes the uneven pattern of one (front or rear) pinch roller pair to be pressed against the portion of the belt-shaped member facing the inner circumference, while the uneven pattern of the other (rear or front) pinch roller pair to be pressed against the portion of the belt-shaped member facing the outer circumference. This reliably prevents the pinch roller pair of the rear stage from running idly due to the pressing marks of the front stage.

As another embodiment of the "non-corresponding" feature, the concave and convex patterns of the two pinch roller pairs may be offset from each other in the roller axial direction. This can reliably prevent the pinch roller pair in the rear stage from rotating idly due to the pressing marks of the previous stage.
For example, the outer roller of each pinch roller pair may have multiple roller portions spaced apart from each other in the roller axial direction, and the roller portion on which the uneven pattern of one pinch roller pair is formed may be misaligned in the roller axial direction.
The uneven pattern of one pinch roller pair may be formed on one side portion of the outer peripheral surface of the inner roller in the roller axial direction, and the uneven pattern of the other pinch roller pair may be formed on the other side portion of the outer peripheral surface of the inner roller in the roller axial direction.

The uneven patterns of the two pinch roller pairs are not limited to being arranged at non-corresponding positions, but may be arranged at corresponding positions. In this case, it is preferable that the uneven patterns are different from each other. In other words, it is preferable that different uneven patterns are formed on the outer peripheral portions of the rollers corresponding to each other in the two pinch roller pairs.
This prevents the rear-stage uneven pattern from overlapping the pressing marks of the front-stage uneven pattern on the belt-shaped member even if the arrangements of the uneven patterns of the two pinch roller pairs correspond to each other, thus reliably preventing the rear-stage pinch roller pair from rotating idly.

As an embodiment of the "different uneven patterns", the uneven pattern of one of the two pinch roller pairs is a twill knurl or an oblique knurl, and the uneven pattern of the other of the two pinch roller pairs is a flat knurl. The front stage may be a twill knurl or an oblique knurl and the rear stage may be a flat knurl, or the front stage may be a flat knurl and the rear stage may be a twill knurl or an oblique knurl.
As a result, the concaves and convexes of the rear concave and convexe pattern intersect with the concaves and convexes of the pressing marks of the front concave and convexe pattern on the belt-shaped member, thereby making it possible to reliably prevent the rear pinch roller pair from rotating idly.

As an embodiment of the "different uneven patterns", the uneven patterns of the two pinch roller pairs each include periodic grooves formed at regular intervals in the roller circumferential direction, and the angles of the periodic grooves of the two pinch roller pairs may be different from each other. For example, the uneven patterns of the two pinch roller pairs may both be oblique knurls, but the inclination angles of the oblique knurls may be different from each other. The inclination angle includes the inclination direction. The uneven pattern of one pinch roller pair may be oblique knurls, and the uneven pattern of the other pinch roller pair may be flat knurls.

As an embodiment of "different uneven patterns", the uneven patterns of the two pinch roller pairs may have different pitches along the roller circumferential direction. In other words, the uneven patterns of the two pinch roller pairs may have different arrangement densities. This prevents the uneven patterns of the latter stage from completely overlapping the pressing marks of the uneven patterns of the former stage on the belt-shaped member, even if the uneven patterns of the former stage are both flat knurling or both twill knurling, and prevents the pinch roller pair of the latter stage from spinning idly.

The depth of the recesses or the height of the protrusions in the uneven pattern of the pinch roller pair in the latter stage along the path may be greater than the depth of the recesses or the height of the protrusions in the uneven pattern of the pinch roller pair in the former stage.
The pressure marks made by these two uneven patterns have different depths. Therefore, even if the pressure marks made by the uneven pattern of the front stage on the belt-shaped member are overlapped by the uneven pattern of the rear stage, the convex parts of the uneven pattern of the rear stage will dig deeper into the belt-shaped member than the pressure marks made by the uneven pattern of the front stage, and a deeper pressure mark will be formed than that of the front stage. This makes it possible to prevent the pinch roller pair of the rear stage from rotating idly.

A character pattern may be formed on the outer peripheral surface of the inner roller of one pinch roller pair. This allows characters to be engraved on the surface that will become the inner peripheral surface of the spiral tube of the belt-shaped member. The character pattern is provided as part of the uneven pattern. The pressing marks become characters. This allows the pressing marks to be put to good use.

It is preferable that the spiral tube forming apparatus comprises a curl forming machine that imparts a curl to the strip-shaped material, and a pipe making machine that joins adjacent edges of the strip-shaped material one revolution apart after the curl has been imparted to form a spiral tube, and that the curl forming machine and the pipe making machine each include at least two pairs of pinch rollers.
It is preferable that the two pinch roller pairs of the curl forming machine each have an uneven pattern formed thereon so that the pressure marks that may be formed on the strip-shaped material do not coincide with each other, and that the two pinch roller pairs of the pipe making machine each have an uneven pattern formed thereon so that the pressure marks that may be formed on the strip-shaped material do not coincide with each other.

According to the present invention, even if the pressing marks of the uneven pattern caused by the pinch roller pair in the front stage are formed on the belt-shaped member during the formation of the helical tube, the pinch roller pair in the rear stage can be prevented from rotating idly, and the driving force from the pinch roller pair can be reliably transmitted to the belt-shaped member.

FIG. 1 is a cross-sectional view showing how an existing pipe is rehabilitated by a spiral pipe forming device according to a first embodiment. FIG. 2(a) is a cross-sectional view of a band-shaped member constituting a rehabilitation pipe (helical pipe) for rehabilitating an existing pipe. FIG. 2B is an enlarged cross-sectional view of a circle IIb in FIG. FIG. 3 is a perspective view of a rehabilitating pipe being produced by a pipe-making machine of the helical pipe forming apparatus. FIG. 4 is a side view of the drive unit of the pipe making machine. 5(a) is a front view of a pair of pinch rollers in the front stage of the driving unit of the pipe making machine, and FIG. 5(b) is a front view of a pair of pinch rollers in the rear stage of the driving unit. 6A and 6B show a second embodiment of the present invention, in which Fig. 6A is a front view of a pair of pinch rollers in the front stage of a pipe making machine, and Fig. 6B is a front view of a pair of pinch rollers in the rear stage of the pipe making machine. 7A and 7B show a third embodiment of the present invention, in which Fig. 7A is a front view of a pair of pinch rollers in the front stage of a pipe making machine, and Fig. 7B is a front view of a pair of pinch rollers in the rear stage of the pipe making machine. 8A and 8B show a fourth embodiment of the present invention, in which Fig. 8A is a front view of a pair of pinch rollers in the front stage of a pipe making machine, and Fig. 8B is a front view of a pair of pinch rollers in the rear stage of the pipe making machine. 9A and 9B show a fifth embodiment of the present invention, in which Fig. 9A is a front view of a pair of pinch rollers in the front stage of a pipe making machine, and Fig. 9B is a front view of a pair of pinch rollers in the rear stage of the pipe making machine. 10A and 10B show a sixth embodiment of the present invention, in which Fig. 10A is a front view of a pair of pinch rollers in the front stage of a pipe making machine, and Fig. 10B is a front view of a pair of pinch rollers in the rear stage of the pipe making machine. 11A and 11B show a seventh embodiment of the present invention, in which Fig. 11A is a front view of a pair of pinch rollers in the front stage of a pipe making machine, and Fig. 11B is a front view of a pair of pinch rollers in the rear stage of the pipe making machine. 12A and 12B show an eighth embodiment of the present invention, in which Fig. 12A is a front view of a pair of pinch rollers in the front stage of a pipe making machine, and Fig. 12B is a front view of a pair of pinch rollers in the rear stage of the pipe making machine. FIG. 13 shows a ninth embodiment of the present invention and is a side view of a drive unit of a pipe making machine. 14 shows a tenth embodiment of the present invention, in which (a) is a front view of a pair of pinch rollers in the front stage of a pipe making machine, (b) is a front view of a pair of pinch rollers in the rear stage of the pipe making machine, and (c) is a bottom perspective view of the front side of the belt-shaped material after it has passed through the pair of pinch rollers in the front stage, viewed slightly obliquely. FIG. 15 is a cross-sectional view showing how an existing pipe is rehabilitated by a helical pipe forming device according to an eleventh embodiment of the present invention. 16 is a front view of the curl forming machine of the spiral tube forming device of the eleventh embodiment, taken along line XVI-XVI in FIG. 15. FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First embodiment (FIGS. 1 to 5)
As shown in Fig. 1, the present invention is applied to, for example, the rehabilitation of an aged existing pipe 1. The existing pipe 1 is rehabilitated by lining the inner periphery of the existing pipe 1 with a rehabilitation pipe 9. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried underground.
The existing pipes to be rehabilitated are not limited to sewer pipes. They can be water pipes, agricultural water pipes, gas pipes, hydroelectric power generation water pipes, and tunnels.

As shown in FIG. 1, the rehabilitation pipe 9 is formed of a spiral pipe formed by winding a belt-shaped member 90 in a spiral shape. As shown in FIG. 2(a), the belt-shaped member 90 includes a belt body 91 made of a synthetic resin such as polyvinyl chloride and a reinforcing belt material 96 made of a metal such as steel, and extends long in the belt length direction (perpendicular to the paper surface of the figure). A first fitting portion 93 having an uneven cross-sectional shape is provided at one end of the belt body 91 in the belt width direction (left and right direction in the figure). A second fitting portion 94 having an uneven cross-sectional shape that is complementary to the uneven cross-sectional shape is provided at the other end of the belt body 91 in the belt width direction. A rib 95 having a T-shaped cross section is provided at the middle part of the belt body 91 in the belt width direction so as to protrude to the back side (upper side in the figure). A reinforcing belt material 96 having a roughly M-shaped cross-sectional shape is provided at the back side of the belt body 91. The surface of the reinforcing belt material 96, preferably the entire surface, may be covered with a resin such as polyethylene.
The cross-sectional shape of the belt-shaped member 90 is not limited to that shown in Fig. 2(a) . The reinforcing belt material 96 may be omitted.

As shown in Figures 2(b) and 3, a band-shaped member 90 is wound spirally around the inner circumference of the existing pipe 1, and a first fitting portion 93 and a second fitting portion 94 that are adjacent to each other but one turn apart are joined together by a concave-convex fitting, thereby constructing a spiral tubular rehabilitation pipe 9.
In the rehabilitation pipe 9, the back side of the band-shaped member 90 faces the outer periphery (upper side in FIG. 2(b)), and the front side of the band-shaped member 90 faces the inner periphery (lower side in the same figure). A flat front surface 91a of the band body 91 forms the inner periphery of the rehabilitation pipe 9.

1, a rehabilitated pipe 9 (helical pipe) is produced by a helical pipe forming apparatus 3. The helical pipe forming apparatus 3 includes a winding drum 5, a hydraulic pump unit 6, and a pipe making machine 10.
A strip portion 90a of the strip-shaped member 90, which is an unmanufactured pipe, is unwound from a winding drum 5 on the ground. The strip portion 90a is inserted into the starting manhole 4, and then passes through a rehabilitating pipe 9 (a manufactured portion of the strip-shaped member 90) in the existing pipe 1, and is introduced into a pipe making machine 10 at the front end (front extension end) of the rehabilitating pipe 9 in the extension direction.

As shown simply in FIG. 3, the pipe making machine 10 comprises an equipment frame 11, pipe end guides 12, 13, and a drive unit 20. The equipment frame 11 is disposed at one location at the front end of the extension of the rehabilitating pipe 9. The pipe end guides 12, 13 are disposed at the base of the equipment frame 11. The pipe end guides 12, 13 are engaged with the front end of the extension of the rehabilitating pipe 9 so as to be slidable in the circumferential direction (winding direction).

As shown in FIG. 3, a drive unit 20 is provided at the center or head of the device frame 11. The drive unit 20 includes at least two (multiple) pinch roller pairs 21, 22 and a drive motor 28 (FIG. 1). The two pinch roller pairs 21, 22 are arranged side by side on the path along which the strip-shaped member 90 is assembled into the rehabilitation pipe 9 (helical pipe), and clamp the strip-shaped member 90 to pull it in or send it out.

More specifically, as shown in Figures 4 and 5, each pair of pinch rollers 21, 22 includes an outer roller 23 and an inner roller 24. The strip portion 90a of the unmanufactured pipe of the strip-shaped member 90 is passed between the outer roller 23 and the inner roller 24 and tightly clamped.

The outer roller 23 has a shaft 23c and two (multiple) disk-shaped roller parts 23a, 23b. The axis (roller axis) of the shaft 23c is oriented in the width direction (left and right in FIG. 5) of the pipe making machine 10 and is substantially aligned with the extension direction. Two roller parts 23a, 23b are provided on the shaft 23c. The roller parts 23a, 23b are arranged apart from each other in the direction along the axis of the shaft 23c (roller axis direction). As shown in FIG. 3, the roller part 23a is arranged on the front side of the extension direction of the helical tube 9, and the roller part 23b is arranged on the rear side of the extension direction.

As shown in Figures 4 and 5, the outer roller 23 faces the back side of the belt-shaped member 90 (the portion facing the outer periphery of the helical tube 9). The roller portions 23a, 23b are inserted into the groove portions 97, 98 on the back side of the belt-shaped member 90 and pressed against the groove bottom portions 97b, 98b. The groove bottom portions 97b, 98b are driving surfaces on the back side of the belt-shaped member 90 that receive the driving force from the pipe making machine 10. The groove bottom portions 97b, 98b (driving surfaces) are formed by both sides of the steel reinforcing member 96. If the reinforcing belt 96 is resin-coated, the coating resin covering the surfaces of the groove bottom portions 97b, 98b comes into direct contact with the outer roller 23.
When the reinforcing member 96 is omitted, the rear surface of the band body 91 made of synthetic resin serves as the drive surface.

As shown in Figures 4 and 5, the inner roller 24 of each pinch roller pair 21, 22 is formed in a cylindrical shape. The axis of the inner roller 24 is oriented parallel to the axis of the shaft 23c. The axial length of the inner roller 24 is preferably approximately equal to or greater than the width of the belt-shaped member 90. The outer diameter of the inner roller 24 is preferably greater than the outer diameter of the shaft 23c and equal to or smaller than the outer diameter of the roller portions 23a, 23b.
The inner roller 24 faces the front side portion of the belt-shaped member 90 (the portion facing the inner circumference side of the helical tube 9). Specifically, the inner roller 24 is pressed against the flat front side surface 91a of the belt main body 91. The front side surface 91a of the belt main body 91 becomes a driving surface on the front side portion of the belt-shaped member 90 that receives a driving force from the pipe making machine 10.

Although detailed illustration is omitted, a drive motor 28 (Fig. 1), such as a hydraulic motor, is connected to each roller 23, 24 of the pinch roller pair 21, 22 via a gear mechanism (power transmission mechanism). As shown in Fig. 1, a hydraulic hose 7 from the hydraulic pump unit 6 passes through the access manhole 4B and the existing pipe 1 and is connected to the drive motor 28 of the pipe making machine 10. This supplies hydraulic power from the hydraulic pump unit 6 to the drive motor 28, and the rollers 23, 24 of the pinch roller pair 21, 22 are rotated and driven in synchronization with each other.

By rotating the rollers 23 and 24, the band portion 90a of the unmade pipe of the band member 90 of the band member 91 is pushed toward the extended front end of the rehabilitated pipe 9, and the first fitting portion 93 of the band portion 90a and the second fitting portion 94 of the extended front end of the rehabilitated pipe 9 are fitted together. As a result, a thrust reaction force is generated, and the pipe making machine 10 is propelled along the winding direction.

As shown in FIG. 5, the two pinch roller pairs 21, 22 each have an uneven pattern 25 formed so that the pressing marks (scratches) that may be formed on the belt-shaped member 90 do not match each other. More specifically, the two pinch roller pairs 21, 22 have uneven patterns 25 formed on the non-corresponding roller outer periphery portions. As shown in FIG. 5(a), the uneven pattern 25 of the front (one) pinch roller pair 21 along the path of the belt-shaped member 90 is formed on the outer periphery surface (roller outer periphery portion 24d) of the inner roller 24. The outer roller 23 of the pinch roller pair 21 does not have an uneven pattern formed, and the outer periphery surfaces of the roller portions 23a, 23b are smooth.

As shown in FIG. 5(b), the uneven pattern 25 of the subsequent (other) pinch roller pair 22 along the path of the belt-shaped member 90 is formed on the outer peripheral surface (roller outer peripheral portion 23d) of the roller portions 23a and 23b of the outer roller 23. The outer peripheral surface of the inner roller 24 of the pinch roller pair 22 is smooth and does not have an uneven pattern formed thereon.

These uneven patterns 25 are formed by knurling. The uneven pattern 25 of the inner roller 24 is a twill knurl 51, but it may also be an oblique knurl or a flat knurl. The uneven pattern 25 of each roller portion 23a, 23b of the outer roller 23 is a flat knurl 52, but it may also be an oblique knurl or a twill knurl.

When the helical tube 9 is formed, the band portion 90a of the unmanufactured tube of the band-shaped member 90 is first pulled into and clamped by the pinch roller pair 21 at the front stage. At this time, the uneven pattern 25 of the inner roller 24 of the pinch roller pair 21 is pressed firmly against the front surface 91a of the band-shaped member 90. This increases the frictional force between the pinch roller pair 21 and the band-shaped member 90, and the driving force from the pinch roller pair 22 can be reliably transmitted to the band-shaped member 90. A pressing mark (not shown) caused by the uneven pattern 25 of the pinch roller pair 21 may be formed on the front surface 91a of the band-shaped member 90.

The belt-shaped member 90 sent out from the pinch roller pair 21 in the front stage is then pulled into and pinched by the pinch roller pair 22 in the rear stage. At this time, the uneven pattern 25 of the outer roller 23 of the pinch roller pair 22 is pressed firmly against the groove bottoms 97b, 98b of the belt-shaped member 90. This increases the frictional force between the pinch roller pair 22 and the belt-shaped member 90. A pressing mark (not shown) caused by the uneven pattern 25 of the pinch roller pair 22 may be formed on the groove bottoms 97b, 98b of the belt-shaped member 90.

The uneven pattern 25 of the front pinch roller pair 21 is provided on the inner roller 24, whereas the uneven pattern 25 of the rear pinch roller pair 22 is provided on the outer roller 23. Therefore, even if the front pinch roller pair 21 leaves a pressing mark on the belt-shaped member 90, the rear pinch roller pair 22 will not rotate idly. Therefore, the driving force from the pinch roller pair 22 can be reliably transmitted to the belt-shaped member 90. This allows the belt portion 90a of the unmade pipe of the belt-shaped member 90 to be reliably sent out from the pinch roller pair 22 and reliably pushed into the rehabilitated pipe 9. As a result, the rehabilitated pipe 9 can be smoothly manufactured.
When the reinforcing strip 96 is resin coated, the coating resin on the drive surface (groove bottom 97b, 98b) of the reinforcing strip 96 comes into contact only with the rear-stage uneven pattern 25 of the front and rear pinch roller pairs 21, 22, thereby suppressing or preventing damage to the coating resin and making the coating resin less likely to peel off.

Next, another embodiment of the present invention will be described. In the following embodiment, the same components as those in the above-described embodiment will be denoted by the same reference numerals in the drawings and the description thereof will be omitted.
Second embodiment (FIG. 6)
As shown in Fig. 6, in the pipe making machine 10B of the second embodiment, the uneven patterns 25 of the two pinch roller pairs 21, 22 are both formed on the outer roller 23, and are offset from each other in the roller axial direction along the axis of the shaft 23c. More specifically, as shown in Fig. 6(a), in the front (one) pinch roller pair 21, the uneven pattern 25 is formed on the outer peripheral surface (outer peripheral portion of the roller) of the roller part 23a on the stretching front side (left side in the figure). The uneven pattern 25 of the pinch roller pair 21 is a flat knurl 52, but it may also be an oblique knurl or a twill knurl.
The outer circumferential surface of the roller portion 23b of the pinch roller pair 21 is a smooth surface.

6B, in the rear (other) pinch roller pair 22, a concave-convex pattern 25 is formed on the outer circumferential surface (outer circumferential portion of the roller) of the roller portion 23b on the rear side of the stretching (right side in the figure). The concave-convex pattern 25 of the pinch roller pair 22 is the same flat knurling 52 as that of the pinch roller pair 21, but may be an oblique knurling or a twill knurling, or may be a pattern different from that of the pinch roller pair 21.
The outer circumferential surface of the roller portion 23a of the pinch roller pair 22 is a smooth surface.
The outer peripheral surface of the inner roller 24 of the pair of pinch rollers 21, 22 of the pipe making machine 10B is a smooth surface.

According to the pipe making machine 10B, the uneven pattern 25 is provided on the outer roller 23 of each pinch roller pair 21, 22, thereby increasing the driving force applied to the belt-shaped member 90. Furthermore, since the uneven patterns 25 of the front and rear stages are offset in the roller axial direction, the pressing marks caused by these uneven patterns 25 do not overlap.
That is, in the front pinch roller pair 21, a pressing mark can be formed on the groove bottom 97b by the uneven pattern 25 of the roller portion 23a. In contrast, the uneven pattern 25 of the rear pinch roller pair 22 is pressed against the groove bottom 98b. Therefore, it is possible to reliably prevent the rear pinch roller pair 22 from rotating idly due to the pressing mark of the front roller, and it is possible to reliably transmit the driving force to the belt-shaped member 90.
Contrary to FIG. 6, the uneven pattern 25 of the front pinch roller pair 21 may be formed on the roller portion 23b, and the uneven pattern 25 of the rear pinch roller pair 22 may be formed on the roller portion 23a.

Third embodiment (FIG. 7)
As shown in Fig. 7, in the pipe making machine 10C of the third embodiment, the uneven patterns 25 of the two pinch roller pairs 21, 22 are both formed on the inner roller 24, and are offset from each other in the roller axial direction along the axis of the shaft 23c. In more detail, as shown in Fig. 7(a) in the front (one) pinch roller pair 21, the uneven pattern 25 is formed on the portion (one side portion) on the outer circumferential surface of the inner roller 24 on the stretching front side (left side in the figure). The uneven pattern 25 of the pinch roller pair 21 is a twill knurl 51, but it may also be an oblique knurl or a flat knurl.
The portion of the outer circumferential surface of the inner roller 24 of the pair of pinch rollers 21 on the rear side of the stretching (the right side in the figure) is a smooth surface.

7B, in the rear (other) pinch roller pair 22, a concave-convex pattern 25 is formed on the portion (other side portion) on the stretched rear side (right side in the figure) of the outer circumferential surface of the inner roller 24. The concave-convex pattern 25 of the pinch roller pair 22 is a twill knurl 51 like that of the pinch roller pair 21, but may be an oblique knurl or a flat knurl, or may be a pattern different from that of the pinch roller pair 21.
The outer circumferential surface of the inner roller 24 of the pinch roller pair 22 on the stretching front side (the left side in the figure) is a smooth surface.
The outer peripheral surfaces of the roller portions 23a, 23b of the outer rollers 23 of the pinch roller pairs 21, 22 of the pipe making machine 10C are both smooth surfaces.

According to the pipe making machine 10C, the inner roller 24 of each pinch roller pair 21, 22 is provided with an uneven pattern 25, thereby increasing the driving force applied to the belt-shaped member 90. In addition, since the uneven patterns 25 of the front and rear stages are offset in the roller axial direction, it is possible to prevent the pressing marks caused by these uneven patterns 25 from overlapping.
That is, in the front pinch roller pair 21, the uneven pattern 25 of the inner roller 24 can form a pressing mark on the extended front side (left side in FIG. 7A) of the front side 91a. In contrast, the uneven pattern 25 of the rear pinch roller pair 22 is pressed against the extended rear side (right side in FIG. 7A) of the front side 91a. This reliably prevents the rear pinch roller pair 22 from rotating idly due to the pressing mark of the front roller, and reliably transmits the driving force to the belt-shaped member 90.
In addition, conversely to Figure 7, in the front pinch roller pair 21, the uneven pattern 25 may be formed on the extended rear portion of the inner roller 24, and in the rear pinch roller pair 22, the uneven pattern 25 may be formed on the extended front portion of the inner roller 24.

<Fourth embodiment (FIG. 8)>
As shown in Fig. 8, in the pipe making machine 10D of the fourth embodiment, uneven patterns 25 are formed on both roller portions 23a, 23b of the outer rollers 23 of the front and rear pinch roller pairs 21, 22. As shown in Fig. 8(a), the uneven pattern 25 of the front pinch roller pair 21 is a twill knurling 51. As shown in Fig. 8(b), the uneven pattern 25 of the rear pinch roller pair 22 is a flat knurling 52. Therefore, different uneven patterns 25 are formed on the outer circumferential portions of the rollers corresponding to each other in the two pinch roller pairs 21, 22.

According to the pipe making machine 10D, both the front and rear uneven patterns 25 are pressed against the groove bottoms 97b, 98b of the belt-shaped member 90. On the other hand, since the front and rear uneven patterns are different from each other, it is possible to prevent the rear uneven pattern from overlapping the pressing marks of the front uneven pattern on the belt-shaped member 90. In detail, since the front uneven pattern 25 is a twill knurl 51, the pressing marks are twill. On the other hand, since the rear uneven pattern 25 is a flat knurl 52, the respective concave and convex portions of the flat knurl 52 intersect with the oblique concave and convex portions of the twill pressing marks. Therefore, a large frictional force can be generated between the rear uneven pattern 25 and the belt-shaped member 90, and the idling of the pinch roller pair 22 in the rear stage can be reliably prevented.
8, the uneven pattern 25 of the front pinch roller pair 21 may be a flat knurl, and the uneven pattern 25 of the rear pinch roller pair 22 may be a twill knurl. Instead of the twill knurl, an oblique knurl may be used.

Fifth embodiment (FIG. 9)
As shown in Fig. 9, the fifth embodiment is a modified example of the fourth embodiment. In a pipe making machine 10E of the fifth embodiment, the uneven patterns 25 of the front and rear pinch roller pairs 21, 22 are both oblique knurling 53. On the other hand, the inclination directions (or inclination angles) of the oblique knurling 53 at corresponding positions in the front and rear stages are different from each other.

More specifically, each oblique knurling 53 includes periodic grooves 53a formed at regular intervals in the circumferential direction (roller circumferential direction) of the roller parts 23a and 23b of the outer roller. The periodic grooves 53a are inclined at an angle of approximately 45° with respect to the roller axial direction and the roller circumferential direction. Moreover, the inclination direction of the periodic grooves 53a of the oblique knurling 53 of the front roller part 23a (FIG. 9(a)) and the inclination direction of the periodic grooves 53a of the oblique knurling 53 of the rear roller part 23a (FIG. 9(b)) differ from each other by approximately 90 degrees. Similarly, the inclination direction of the periodic grooves 53a of the oblique knurling 53 of the front roller part 23b (FIG. 9(a)) and the inclination direction of the periodic grooves 53a of the oblique knurling 53 of the rear roller part 23b (FIG. 9(b)) differ from each other by approximately 90 degrees.

As shown in FIG. 9A, in the front-stage pinch roller pair 21, the inclination directions of the periodic grooves 53a of the oblique knurling 53 of the roller portions 23a, 23b are different from each other by approximately 90 degrees.
As shown in FIG. 9B, in the rear pinch roller pair 22, the inclination directions of the periodic grooves 53a of the oblique knurlings 53 of the roller portions 23a, 23b differ from each other by approximately 90 degrees.

With the pipe making machine 10E, the uneven pattern 25 consisting of the diagonal knurling 53 in the front stage can form a diagonal groove-like pressing mark. The diagonal knurling 53 that constitutes the uneven pattern 25 in the rear stage intersects with the diagonal groove of the pressing mark. Therefore, a large frictional force can be generated between the uneven pattern 25 in the rear stage and the belt-shaped member 90, and the idle rotation of the pinch roller pair 22 in the rear stage can be reliably prevented.

Sixth embodiment (FIG. 10)
As shown in Fig. 10, in the pipe making machine 10F of the sixth embodiment, the uneven pattern 25 of the roller parts 23a, 23b in the front stage (Fig. 10(a)) is an oblique knurl 53 including an inclined periodic groove 53a, whereas the uneven pattern 25 of the roller parts 23a, 23b in the rear stage (Fig. 10(b)) is a flat knurl 52. The flat knurl 52 includes periodic grooves 52a formed at regular intervals in the circumferential direction (roller circumferential direction) of the roller parts 23a, 23b of the outer roller. The periodic grooves 52a are perpendicular to the roller circumferential direction and extend parallel to the roller axial direction. Therefore, the angle of the periodic grooves 53a of the pinch roller pair 21 in the front stage and the periodic grooves 52a of the pinch roller pair 22 in the rear stage with respect to the roller circumferential direction is different by approximately 45 degrees.
Therefore, the flat knurling 52 constituting the rear-stage uneven pattern 25 intersects with the oblique pressing marks caused by the uneven pattern 25 consisting of the front-stage oblique knurling 53. This allows a large frictional force to be generated between the rear-stage uneven pattern 25 and the belt-shaped member 90, and makes it possible to reliably prevent the rear-stage pinch roller pair 22 from rotating idly.
10, the uneven pattern 25 of the front roller parts 23a and 23b may be a flat knurl, and the uneven pattern 25 of the rear roller parts 23a and 23b may be a diagonal knurl. Instead of the diagonal knurl, a twill knurl may be used.

Seventh embodiment (FIG. 11)
As shown in Fig. 11, in the seventh embodiment of the pipe making machine 10G, the uneven patterns 25 of the front and rear roller sections 23a, 23b are both flat knurls 52, 52B. Meanwhile, the pitches of the uneven patterns 25 of the front and rear sections along the circumferential direction of the roller are different from each other. Specifically, the pitch of the flat knurls 52 of the front section (Fig. 11(a)) is relatively large, and the pitch of the flat knurls 52B of the rear section (Fig. 11(b)) is relatively small.
Therefore, it is possible to prevent the concave-convex pattern 25 of the rear stage from completely overlapping the pressing trace of the concave-convex pattern 25 of the front stage on the belt-shaped member 90. This makes it possible to prevent the pinch roller pair of the rear stage from rotating idly.
Contrary to FIG. 11, the pitch of the front row flat knurling may be smaller than that of the rear row flat knurling.

Eighth embodiment (FIG. 12)
The eighth embodiment shown in Fig. 12 is a modified example of the seventh embodiment, and in the pipe making machine 10H, the uneven patterns 25 of the front and rear roller portions 23a, 23b are both twill knurls 51, 51B. The pitch of the twill knurls 51 in the front stage (Fig. 12(a)) is relatively large, and the pitch of the twill knurls 51B in the rear stage (Fig. 12(b)) is relatively small.
Contrary to FIG. 12, the pitch of the front row of twill knurls may be smaller than that of the rear row of twill knurls.

Ninth embodiment (FIG. 13)
As shown in Figure 13, in the ninth embodiment of the pipe making machine 10I, the depth of the recess 25e or the height of the protrusion 25f in the uneven pattern 25 of the subsequent pinch roller pair 22 along the path of the band-shaped member 90 is greater than the depth of the recess 25c or the height of the protrusion 25d in the uneven pattern 25 of the preceding pinch roller pair 21.
The front and rear uneven patterns 25 may be flat knurling, twill knurling, or oblique knurling, respectively. The front and rear uneven patterns 25 may be the same pattern or different patterns.

During pipe making, a pressing mark 99 (scratches) may be formed on the belt-shaped member 90 by the uneven pattern 25 of the pinch roller pair 21 at the front stage. The pressing mark 99 by the pinch roller pair 21 at the front stage is relatively shallow. The belt-shaped member 90 is then introduced into the pinch roller pair 22 at the rear stage. Even if the uneven pattern 25 of the pinch roller pair 22 at the rear stage overlaps with the pressing mark 99, the convex portion 25f will bite deeper into the belt-shaped member 90 than the pressing mark 99. Therefore, idling of the pinch roller pair 22 at the rear stage can be prevented.
A pressing mark 99B that is deeper than the pressing mark 99 of the preceding stage can be formed on the belt-shaped member 90 by the concave-convex pattern 25 of the pinch roller pair 22 of the succeeding stage.

Tenth embodiment (FIG. 14)
As shown in Fig. 14(a), in the pipe making machine 10J of the tenth embodiment, a character die 54 is formed on the outer peripheral surface of the inner roller 24 of the front pinch roller pair 21 (the first pinch roller pair). The character die 54 is provided as part of the uneven pattern. The character die 54 is preferably disposed at a position corresponding to the roller portions 23a and 23b. This allows characters 91c to be engraved on the front surface 91a of the belt-shaped member 90 (the surface that will become the inner peripheral surface of the spiral tube) as shown in Fig. 14(c).

In other words, by forming a part of the concave-convex pattern into the character mold 54, the pressing marks become the characters 91c. Therefore, the pressing marks can be put to good use.
14B, an uneven pattern 25 is formed on the outer roller 23 of the rear pinch roller pair 22. The uneven pattern 25 is a flat knurl 52, but may be a twill knurl or a diagonal knurl.
The character pattern 54 may be formed on the pinch roller pair 22 in the rear stage, and the uneven pattern 25 such as a flat knurl, a twill knurl, or a diagonal knurl may be formed on the pinch roller pair 21 in the front stage. In this case, the pinch roller pair 22 in the rear stage becomes the "first pinch roller pair."

Eleventh embodiment (FIGS. 15 and 16)
As shown in Fig. 15, the helical tube forming device 3K in the eleventh embodiment includes a curl forming machine 30. As shown in Fig. 16, the curl forming machine 30 includes a support frame 31 and a curl forming unit 32. The support frame 31 is formed in an annular shape with an outer diameter slightly smaller than the inner diameter of the winding drum 5. The support frame 31 and the curl forming machine 30 are housed in a hollow portion within the winding drum 5 on the ground, and are held rotatably about the axis L5 of the winding drum 5.

As shown in FIG. 16, the curl forming section 32 has a holding frame 33, a guide section 34, a connecting frame 35, and at least two pairs of pinch rollers 41, 42. The holding frame 33 is formed in an annular shape with an outer diameter slightly smaller than the inner diameter of the support frame 31. The holding frame 33 and thus the curl forming section 32 are housed inside the support frame 31 and are held movably along the axis L5.

A guide portion 34, a connecting frame 35, and pinch roller pairs 41, 42 are arranged inside the holding frame 33. The pinch roller pairs 41, 42 and the guide portion 34 are connected to the holding frame 33 via the connecting frame 35. Along a path of the belt-shaped member 90 described below, the front pinch roller pair 41 and the rear pinch roller pair 42 are arranged approximately 180 degrees apart from each other about the axis L5 and shifted in the direction of the axis L5 (a direction perpendicular to the paper surface in FIG. 16 ). Each pinch roller pair 41, 42 includes an outer roller 43 and an inner roller 44.
A drive motor (not shown) is connected to at least one of the pinch roller pairs 41 and 42 so as to be capable of transmitting torque.
The guide portion 34 is formed in a partial spiral plate shape connecting the pair of pinch rollers 41 and 42 .

The belt-shaped member 90 is unwound from the inner periphery of the winding drum 5 to the inside, passed between the outer roller 43 and the inner roller 44 of the pinch roller pair 41 in the front stage (one), and drawn into the curl forming section 32 by the driving of the pinch roller pair 41. The belt-shaped member 90 coming out of the pinch roller pair 41 is fed along the guide section 34, whereby a curl having a predetermined curvature is imparted to the belt-shaped member 90. The belt-shaped member 90 is then fed between the outer roller 43 and the inner roller 44 of the pinch roller pair 42 in the rear stage (the other), and is then sent out.
The belt-shaped member 90 thus given a curl is inserted into the manhole 4 from above ground, and is supplied to the pipe making machine 10K inside the existing pipe 1, where it is made into a rehabilitated pipe 9. Even if the belt-shaped member 90 has high rigidity, by giving it a curl, the belt-shaped member 90 can be smoothly supplied from above ground to the pipe making machine 10K, making pipe making easier.

The two pinch roller pairs 41, 42 of the curl forming machine 30 have an uneven pattern 45 formed on their outer peripheries so that the pressing marks that may be formed on the belt-shaped member 90 do not coincide with each other. The uneven pattern 45 can be configured similarly to the uneven pattern 25 of any of the pipe making machines 10, 10B to 10J of the first to tenth embodiments described above. This prevents the pinch roller pair 42 in the rear stage from rotating idly even if the pressing marks of the uneven pattern 45 by the pinch roller pair 41 in the front stage are formed on the belt-shaped member 90, and the driving force of the curl forming machine 30 can be reliably transmitted to the belt-shaped member 90.

Although detailed illustration is omitted, the pinch roller pairs 21 and 22 of the pipe making machine 10K are formed with an uneven pattern 25 similar to that of any of the pipe making machines 10, 10B to 10J. The uneven patterns 25 of these pinch roller pairs 21 and 22 are in a relationship such that the pressing marks that may be formed on the strip-shaped member 90 do not coincide with each other.

Furthermore, the uneven pattern 45 of the pinch roller pair 42 in the rear stage of the curl forming machine 30 and the uneven pattern 25 of the pinch roller pair 21 in the front stage of the pipe making machine 10K may be in a relationship such that the pressure marks that may be formed on the strip-shaped material 90 do not coincide with each other.
Furthermore, the uneven patterns 45, 25 of the four pinch roller pairs 41, 42, 21, 22 of the spiral tube forming device 3K may be in a relationship such that the pressing marks that may be formed on the belt-shaped member 90 do not coincide with each other.
This prevents the pinch roller pairs in the later stages (second and subsequent stages) from rotating idly even if a pressure mark is formed on the band-shaped material 90 by the pinch roller pair in the earlier stages, and ensures that the driving force of the curl forming machine 30 and the pipe making machine 10K is transmitted reliably to the band-shaped material 90.

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 pipe making machine may have three or more pinch roller pairs, and at least two of these pinch roller pairs may each be formed with an uneven pattern so that the pressure marks that may be formed on the belt-shaped member 90 do not coincide with each other. The curl forming machine may have three or more pinch roller pairs, and at least two of these pinch roller pairs may each be formed with an uneven pattern so that the pressure marks that may be formed on the belt-shaped member 90 do not coincide with each other.
The pressing marks may be formed in any manner that can be formed on the belt-shaped member 90, and do not necessarily have to be formed in a manner that can be distinguished by visual inspection or the like.
The curl forming device may include two or more pinch roller pairs and may be any device capable of forming a curl in the belt-shaped member 90, and is not limited to the structure of the tenth embodiment (FIG. 16).
The present invention is not limited to the formation of a rehabilitation pipe that is lined on the inner circumference of an existing pipe, but can be applied to the formation of various spiral pipes.

The present invention can be applied, for example, to rehabilitation construction techniques for aging sewer pipes.

1 Existing pipe 3, 3K Spiral pipe forming device 5 Winding drum L5 Axis of winding drum 9 Rehabilitation pipe (spiral pipe)
90: belt-shaped member 90a: belt portion of unmanufactured pipe 91: belt body 91a: front surface (drive surface)
93 First fitting portion 94 Second fitting portion 96 Reinforcing strip 97b, 98b Groove bottom portion (drive surface)
10 Pipe making machines 10B to 10K Pipe making machine 11 Device frame 20 Drive unit 21 Front stage (one side) pinch roller pair 22 Rear stage (other side) pinch roller pair 23 Outer roller 23a Front side roller portion 23b in the stretching direction Rear side roller portion 23d in the stretching direction Roller outer periphery portion 24 Inner roller 24d Roller outer periphery portion 25 Uneven pattern 25c Front stage recess 25d Front stage protrusion 25e Rear stage recess 25f Rear stage protrusion 30 Curl forming machine 32 Curl forming unit 41 Front stage (one side) pinch roller pair 42 Rear stage (other side) pinch roller pair 43 Outer roller 44 Inner roller 45 Uneven pattern 51 Twill knurling (uneven pattern)
51B Small pitch twill knurling (uneven pattern)
52 Flat knurling (uneven pattern)
52a Periodic groove 52B Small pitch flat knurling (concave-convex pattern)
53 Diagonal knurling (concave and convex pattern)
53a Periodic groove 54 Character type (concave-convex pattern)
91c Character (pressure mark)
99: Marks of pressing on the front stage 99B: Marks of pressing on the rear stage

Claims (11)

A spiral tube forming apparatus for forming a spiral tube from a strip-shaped member, comprising:
at least two pairs of pinch rollers are arranged side by side on a path along which the strip-shaped member is assembled into the helical tube, and pinch and draw or feed the strip-shaped member , each pair of pinch rollers having an inner roller facing a portion of the strip-shaped member that faces the inner circumference of the helical tube, and an outer roller facing a portion of the strip-shaped member that faces the outer circumference of the helical tube,
The spiral tube forming device is characterized in that each of the two pinch roller pairs has an uneven pattern formed thereon so that the pressure marks that may be formed on the strip-shaped material do not coincide with each other, and the uneven pattern is provided on at least one of the outer roller and the inner roller of each pinch roller pair . The spiral tube forming device as described in claim 1, characterized in that the uneven patterns of one pinch roller pair and the uneven patterns of the other pinch roller pair are formed on non-corresponding roller outer periphery portions so as to be pressed against different locations on the belt-shaped member . The concave and convex pattern of one of the pinch roller pairs is formed on the inner roller,
3. The spiral tube forming device according to claim 1, wherein the concave and convex pattern of the other pair of pinch rollers is formed on an outer roller. The spiral tube forming device according to claim 1 or 2, characterized in that the uneven patterns of the two pinch roller pairs are offset from each other in the roller axial direction. The spiral tube forming device according to claim 1, characterized in that different uneven patterns are formed on the outer periphery of the rollers corresponding to each other in the two pairs of pinch rollers. The uneven pattern of one of the two pinch roller pairs is a twill knurl or a diagonal knurl,
6. The spiral tube forming device according to claim 1, wherein the other of the two pinch roller pairs has a flat knurled pattern. The spiral tube forming device according to claim 1 or 5, characterized in that the uneven patterns of the two pinch roller pairs each include periodic grooves formed at regular intervals in the circumferential direction of the rollers, and the angles of the periodic grooves of the two pinch roller pairs are different from each other. The spiral tube forming device according to claim 1 or 5, characterized in that the pitch of the uneven patterns of the two pinch roller pairs along the roller circumferential direction is different from each other. The spiral tube forming device according to claim 1 or 5, characterized in that the depth of the recesses or the height of the protrusions in the uneven pattern of the pinch roller pair at the rear along the path is greater than the depth of the recesses or the height of the protrusions in the uneven pattern of the pinch roller pair at the front. The spiral tube forming device according to any one of claims 1 to 9, characterized in that a character pattern is formed on the outer circumferential surface of the inner roller of one pinch roller pair. a curling machine that curls the belt-shaped member; and a pipe making machine that joins adjacent edges of the belt-shaped member after the curling to form a helical pipe,
11. The spiral tube forming apparatus according to claim 1, wherein the curl forming machine and the tube making machine each include at least two pairs of pinch rollers.

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