JP7412232B2 - Strip member for spiral tube and spiral tube - Google Patents

Description

The present invention relates to a belt-like member for a spiral pipe and a spiral pipe formed by the belt-like member, and particularly to a belt-like member and a spiral pipe suitable for rehabilitation pipes that are lined with existing pipes such as sewer pipes.

2. Description of the Related Art A method of rehabilitating an existing pipe such as an aged sewer pipe by lining the inner periphery of the existing pipe with a rehabilitation pipe made of a band-like member is known.
For example, in the band-shaped member disclosed in Patent Document 1, concave-convex fitting portions are provided on both sides in the width direction, and a bellows-like expandable portion is provided in the middle portion. The strip member is wound in a spiral shape, and the uneven fitting portion on one side in the width direction and the uneven fitting portion on the other side, which are shifted by one circumference from each other, are fitted together to form a helical rehabilitation pipe. is configured. When an external force such as an earthquake acts on the rehabilitated pipe, the expandable portion expands and contracts, allowing it to absorb the energy of the earthquake.

Patent No. 3779037

In the spiral pipe (rehabilitated pipe) manufactured using the belt-shaped member of Patent Document 1 mentioned above, the expandable portion can be deformed even without a large external force due to an earthquake or the like. For example, in a non-straight part such as a bent part or a step in an existing pipe, the helical pitch of the helical pipe is changed, so tensile force or compressive force is generated in the pipe axis direction, which can deform the expandable part. Further, in the belt-shaped member of Patent Document 1 mentioned above, deformation during an earthquake is concentrated only in the expandable portion, and there is a risk that the expandable portion may be torn.
In view of such circumstances, the present invention provides that the telescoping portion is not deformed by a relatively small force below a predetermined value, that deformation of the telescoping portion is reliably allowed when a large external force such as an earthquake is applied, and that the telescoping portion is torn. It is an object of the present invention to provide a belt-like member for a spiral tube that can prevent the above.

In order to solve the above-mentioned problems, the present invention is arranged so that the parts of the first end side part and the second end side part in the width direction, which are wound in a spiral and are shifted by one circumference from each other in the width direction, are overlapped in the thickness direction and joined. A strip member that becomes a spiral tube,
an expandable part provided on the first end side part and expandable in the width direction;
a first fitting part provided on the end side in the width direction of the elastic part in the first end side part;
a first expansion/contraction stopper provided on the opposite side of the first fitting portion across the expansion/contraction portion at the first end side portion or within the expansion/contraction portion;
a second fitting part that is provided closer to the central part in the width direction of the band-shaped member than the part of the second end side part that overlaps with the elastic part, and that is capable of fitting with the first fitting part;
A first portion is provided on the second end side apart from the second fitting portion toward the end in the width direction, and is releasably engaged with the first expansion/contraction stopper to stop the expansion/contraction of the expansion/contraction portion. 2 expansion/contraction stopper;
The strength of the engagement in the width direction between the first and second expansion/contraction stop portions is smaller than the strength of the fit in the width direction between the first and second fitting portions,
The strength of the engagement in the thickness direction between the first and second expansion/contraction prevention parts is smaller than the strength of the engagement in the thickness direction between the first and second fitting parts, and The strength of the engagement in the width direction between the stop portions is smaller than the strength of the engagement in the width direction.

The strength of fitting refers to the maximum external force that maintains the fitting when a force is applied in a certain direction to separate the first and second fitting parts that are fitted together.
The engagement strength refers to the maximum external force that maintains the engagement when a force is applied in a certain direction to separate the first and second expansion/contraction stops that are engaged with each other.
The width direction of the band member is along the tube axis direction of the spiral tube. Strictly speaking, it is oriented in a direction inclined by the lead angle with respect to the tube axis direction.
The thickness direction of the strip member is along the radial direction of the spiral tube.
In a helical tube manufactured using the band-shaped member, a force less than a predetermined magnitude in the tube axis direction (width direction) (for example, a force in the tube axis direction caused by a change in the helical pitch at a non-straight portion such as a bend or a step) Depending on the applied tensile force or compressive force, not only the fitted state of the first and second fitting parts is maintained, but also the engaged state of the first and second expansion/contraction stop parts. By sandwiching the stretchable part between the first and second fitting parts and the first and second expansion/contraction stop parts that are fitted or engaged with each other, expansion and contraction of the stretchable part can be suppressed or prevented.
When a large external force greater than a predetermined amount is applied to the helical tube due to an earthquake or the like, the fitted state of the first and second fitting parts is maintained, while the engaged state of the first and second expansion/contraction stop parts is maintained. can be canceled. At this time, since the energy of an earthquake or the like is absorbed, the burden on the stretchable part can be reduced and the stretchable part can be prevented from being torn. By disengaging the first and second expansion/contraction stops, the expansion/contraction section becomes expandable and retractable, and can further absorb energy such as earthquakes. Thereby, the fitting between the first and second fitting parts can be maintained reliably.

It is preferable that the first and second expansion/contraction stop portions are able to engage with each other so as to be restricted in the width direction while allowing relative displacement in the thickness direction.
As a result, in non-straight sections such as bends and steps, the first and second expansion stops may come apart due to a relatively small force in the direction of the tube axis that acts on the helical tube during normal times, not during earthquakes. You can avoid it. On the other hand, when a large external force greater than a predetermined value is applied due to an earthquake or the like, the first and second expansion/contraction stops easily come off each other, allowing the expansion/contraction section to expand and contract.

At least one of the first and second expansion/contraction stoppers has an engagement groove, and at least the other is capable of being inserted into and removed from the engagement groove in the thickness direction and cannot be locked to the withdrawal side in the thickness direction. It is preferable to have an engaging protrusion.
As a result, the first and second expansion/contraction stop portions can be engaged with each other so as to be restricted in the width direction while allowing relative displacement in the thickness direction.

the first expansion/contraction stopper has a first engagement protrusion;
It is preferable that the second expansion/contraction stopper has a second engagement protrusion that abuts the first engagement protrusion from the opposite side to the first fitting part.
Thereby, the first and second expansion/contraction stoppers can be easily disengaged from each other while being restricted in the width direction.

At least one of the first and second fitting portions has a fitting groove, and at least the other has a fitting protrusion that fits into the fitting groove,
At least one of the first and second expansion/contraction stoppers has an engagement groove, at least the other has an engagement protrusion that fits into the engagement groove, and the engagement groove is connected to the fitting groove. It is preferable that the engaging protrusion is shallower or lower than the fitting protrusion.
Thereby, the engagement strength between the first and second expansion/contraction stop portions can be made lower than the engagement strength between the first and second fitting portions.

At least one of the first and second fitting portions has a plurality of fitting grooves, and at least the other has a plurality of fitting protrusions that fit into the fitting grooves,
At least one of the first and second extension stop portions has an engagement groove, at least the other has an engagement protrusion that fits into the engagement groove, and the engagement groove and the engagement protrusion It is preferable that the number of the fitting grooves and the fitting protrusions is smaller than the number of the fitting grooves and the fitting protrusions.
Thereby, the engagement strength between the first and second expansion/contraction stop portions can be made lower than the engagement strength between the first and second fitting portions.

It is preferable that the first and second expansion and contraction stops have uneven surfaces that contact each other and generate frictional resistance in the width direction.
Thereby, the first and second expansion/contraction stoppers can be easily disengaged from each other while being restricted in the width direction.

The first fitting part and the second fitting part are made of hard resin, and at least one of the second expansion and contraction stopping part and the first expansion and contraction stopping part is connected to the first fitting part and the second fitting part. It is preferable that the material is softer than the other parts. More preferably, at least one of the second expansion/contraction stopper and the first expansion/contraction stopper is made of soft resin, rubber, or elastomer.
Thereby, at least one of the first expansion/contraction stopper and the second expansion/contraction stopper can be easily released from engagement by being elastically deformed by an external force. The first and second fitting parts can be firmly fitted together.

further comprising a flat band-shaped wide band plate portion extending from the center portion in the width direction of the band-shaped member to the second end side portion,
The first end side portion is provided with a flat strip-shaped narrow strip portion that is narrower than the wide strip portion,
It is preferable that a step be formed between the narrow band plate portion and the wide band plate portion, the height being equal to the thickness of a portion of the wide band plate portion overlapped with the first end side portion. .
As a result, the second end side portion fills the step, thereby making it possible to smooth the inner periphery of the helical tube.

In the spiral tube according to the present invention, the spiral tube band member is spirally wound, and the spiral tube includes a fitting mechanism including the first fitting part and the second fitting part, the first expansion/contraction stop part, and the second fitting part. An expansion/contraction stop mechanism consisting of an expansion/contraction stop part is arranged so as to face each other in the tube axis direction, and the expansion/contraction part is arranged so as to be sandwiched between the fitting mechanism and the expansion/contraction stop mechanism. do.
According to the spiral tube, by sandwiching the expandable portion between the fitting mechanism and the expansion/contraction preventing mechanism, it is possible to prevent the expandable portion from being expanded or contracted with a small force less than a predetermined value. When a large external force greater than a predetermined value is applied due to an earthquake or the like, the first and second expansion/contraction stops are disengaged from each other and the expansion/contraction section is allowed to expand or contract, thereby absorbing the energy of the earthquake or the like.

The first and second fitting portions may be bonded together using an adhesive. Thereby, even if a large external force greater than a predetermined value is applied due to an earthquake or the like, it is possible to reliably prevent the first and second fitting portions from being disengaged from each other.

According to the present invention, it is possible to prevent the extensible portion of the spiral tube from being expanded or deformed by a small force less than a predetermined value, and to allow the extensible portion to be deformed when a large external force of more than a predetermined value is applied such as in an earthquake. Furthermore, the elastic part can be prevented from being torn.

FIG. 1 shows a band-shaped member according to a first embodiment of the present invention, and is a sectional view taken along line II in FIG. 2(b). FIG. 2(a) is a plan sectional view of an existing pipe that has been rehabilitated by lining the rehabilitated pipe made of the band-shaped member. FIG. 2(b) is a perspective view showing the rehabilitated pipe during pipe manufacture. FIG. 3(a) shows a state in which the rehabilitated pipe is manufactured from the band-shaped member, and is a sectional view at the circular portion IIIa in FIG. 2(b). FIG. 3(b) is a cross-sectional view of the circular portion IIIb in FIG. 2(b), showing the joint between the first end side portion and the second end side portion of the rehabilitated pipe in a normal state without receiving a large external force. . FIG. 3(c) is a cross-sectional view of the rehabilitated pipe in a state where the expansion/contraction prevention mechanism is disengaged due to a large external force such as an earthquake. FIG. 3(d) is a cross-sectional view of the rehabilitated pipe in a state where the expandable portion is expanded and contracted by the release. FIG. 4(a) is a cross-sectional view of a band-shaped member according to a second embodiment of the present invention. FIG. 4(b) is a cross-sectional view showing the joint between the first end side portion and the second end side portion of the rehabilitated pipe made of the band-shaped member of the second embodiment in a normal state. FIG. 4(c) is a sectional view showing the rehabilitated pipe in the second embodiment when a large external force is applied due to an earthquake or the like. FIG. 5(a) is a cross-sectional view of a band-shaped member according to a third embodiment of the present invention. FIG. 5(b) is a cross-sectional view showing a joint between a first end side portion and a second end side portion of a rehabilitated pipe made of a band-like member according to the third embodiment in a normal state. FIG. 5(c) is a sectional view showing the rehabilitated pipe when a large external force is applied due to an earthquake or the like in the third embodiment. FIG. 6(a) is a sectional view of a band-shaped member according to a fourth embodiment of the present invention. FIG. 6(b) is a cross-sectional view showing the joint between the first end side part and the second end side part of the rehabilitated pipe made of the band-shaped member of the fourth embodiment in a normal state. FIG. 6(c) is a sectional view showing the rehabilitated pipe when a large external force is applied due to an earthquake or the like in the fourth embodiment. FIG. 7(a) is a sectional view of a band-shaped member according to a fifth embodiment of the present invention. FIG. 7(b) is a cross-sectional view showing the joint between the first end side part and the second end side part of the rehabilitated pipe made of the band-shaped member of the fifth embodiment in a normal state. FIG. 7(c) is a sectional view showing the rehabilitated pipe when a large external force is applied due to an earthquake or the like in the fifth embodiment. FIG. 7(d) is a sectional view of the rehabilitated pipe showing another aspect of the pipe manufacturing method in the non-straight portion in the fifth embodiment. FIG. 8(a) is a sectional view of a band-shaped member according to a sixth embodiment of the present invention. FIG. 8(b) is a cross-sectional view showing a joint between a first end side portion and a second end side portion of a rehabilitated pipe made of a band-shaped member according to the sixth embodiment in a normal state. FIG. 8(c) is a sectional view showing the rehabilitated pipe when a large external force is applied due to an earthquake or the like in the sixth embodiment. FIG. 9(a) is a cross-sectional view of a band-shaped member according to a seventh embodiment of the present invention. FIG. 9(b) is a cross-sectional view showing the joint portion of the first end side portion and the second end side portion of the rehabilitated pipe made of the band-shaped member of the seventh embodiment in a normal state. FIG. 9(c) is a sectional view showing the rehabilitated pipe in the seventh embodiment when a large external force is applied due to an earthquake or the like. FIG. 10(a) is a sectional view of a band-shaped member according to an eighth embodiment of the present invention. FIG. 10(b) is a cross-sectional view showing the joint between the first end side portion and the second end side portion of the rehabilitated pipe made of the band-shaped member of the eighth embodiment in a normal state. FIG. 10(c) is a sectional view showing the rehabilitated pipe in the eighth embodiment when a large external force is applied due to an earthquake or the like. FIG. 11 shows a ninth embodiment of the present invention, and is a sectional view showing a joint between a first end side portion and a second end side portion of a rehabilitated pipe in a normal state.

Embodiments of the present invention will be described below with reference to the drawings.
<First embodiment (FIGS. 1 to 3)>
As shown in FIG. 2(a), the existing pipe 1, such as an aged sewer pipe, is rehabilitated by lining the inner surface of the existing pipe 1 with a rehabilitation pipe 2. Existing pipes 1 include, in addition to sewer pipes, water supply pipes, agricultural water pipes, hydroelectric power supply pipes, gas pipes, tunnels, and the like.
As shown in FIG. 2(b), the rehabilitated pipe 2 is a helical pipe formed by winding a strip member 3 (profile) in a spiral shape.

As shown in FIG. 1, the strip member 3 has a constant cross section and extends long in a direction perpendicular to the paper plane of FIG. The material of the strip member 3 is hard resin such as polyvinyl chloride. Preferably, the strip member 3 is produced by extrusion molding.

The band-like member 3 includes a band main body 10, a pair of fitting parts 13 and 14, a pair of expansion and contraction stops 15 and 16, an expansion and contraction part 17, and a rib 18.
The band body 10 includes a narrow flat band-shaped band plate portion 11 and a wide flat band-shaped band plate portion 12. The narrow band plate portion 11 is arranged at a first end side portion 3a (left side in FIG. 1) of the band member 3 in the width direction. The wide strip portion 12 is formed wider than the narrow strip portion 11, and extends from the center portion 3c of the strip member 3 in the width direction to the second end side portion 3b (right side in FIG. 1).
The band main body 10 (11, 12) has a constant thickness except for a thick portion 12d of the wide band plate portion 12 near the first end side portion 3a.

The narrow strip portion 11 is recessed toward the back side (one side, the upper side in FIG. 1) in the thickness direction (vertical direction in FIG. 1) with respect to the wide strip portion 12. A step is formed between the narrow strip portion 11 and the wide strip portion 12, the height being equal to the thickness of the wide strip portion 12 at the second end side portion 3b.
Among the band plate parts 11 and 12, at least the front surface 12a of the wide band plate part 12 is a smooth surface.

As shown in FIGS. 3(a) and 3(b), in the spiral tube 2 (FIG. 2(b)) formed by winding the strip member 3, the back side of the strip member 3 is directed toward the outer circumference, The front side is directed toward the inner circumference. In addition, portions of the first end side portion 3a and the second end side portion 3b that are shifted by one circumference from each other are overlapped in the tube diameter direction (thickness direction). As shown in FIG. 3(b), the wide band plate portion 12 in the second end side portion 3b is overlapped with the inner peripheral side (lower side in the figure) of the first end side portion 3a, so that the step is reduced. Buried. The front surface 12a of the wide band plate portion 12 constitutes the inner circumferential surface of the spiral tube 2. The inner circumferential surface is a smooth surface with no level difference even at the seam 2c between the first end side 3a and the second end side 3b.

As shown in FIG. 1, a plurality of ribs 18 are arranged side by side in the band center portion 3c. The rib 18 is formed in a T-shaped cross section and protrudes from the wide band plate portion 12 at the band center portion 3c to the back side (upper side in FIG. 1).

As shown in FIGS. 1 and 3(a), in addition to the narrow strip portion 11, the first end side portion 3a of the strip member 3 includes a fitting portion 13, an elastic portion 17, and an elastic stop portion 15. It is located. The first fitting portion 13, the narrow strip portion 11, the elastic portion 17, and the first elastic stop portion 15 are arranged in this order from the end (left end in FIG. 1) of the first end side portion 3a.
The first fitting portion 13 is provided on the end side of the first end side portion 3a in the width direction (on the left side in FIG. 1) with respect to the elastic portion 17. Preferably, the first fitting portion 13 is disposed at the widthwise end (the left end in FIG. 1) of the first end side portion 3a. A narrow strip portion 11 is interposed between the first fitting portion 13 and the expandable portion 17.

As shown in FIGS. 1 and 3(a), the first fitting part 13 has two (plural) fitting protrusions 13a and two (plural) fitting protrusions 13a. It has a groove 13b and a base portion 13c, and is formed to have an uneven cross-sectional shape. The base portion 13c is retracted from the first end side portion 3a to the back side (upper side in FIG. 1) and is connected to the narrow strip portion 11 via the connecting portion 13d. A fitting protrusion 13a protrudes from the base portion 13c toward the front side (downward in FIG. 1). A locking claw portion 13f is formed on the fitting protrusion 13a.
The fitting groove 13b is open toward the front side (lower side in FIG. 1) and is recessed toward the back side (upper side in FIG. 1).
The fitting protrusions 13a and the fitting grooves 13b are arranged alternately in the width direction (left and right in FIG. 1).

A first elastic stopper 15 is provided on the opposite side of the first fitting portion 13 (on the right side in FIG. 1) across the elastic portion 17 at the first end side portion. Preferably, the first expansion/contraction stopper 15 is disposed at the boundary between the first end side portion 3a and the band center portion 3c. The first expansion/contraction stopper part 15 is formed in a concave-convex shape that is gentler than the fitting parts 13 and 14, or in a concave-convex shape that is smaller than the fitting parts 13 and 14. Specifically, the first expansion/contraction stopper 15 has an engagement protrusion 15a and an engagement groove 15b. The engagement protrusion 15a projects toward the front side (downward in FIG. 1) in a tapered manner. The cross-sectional shape of the engagement protrusion 15a is approximately a right triangle, that is, a non-obtuse triangle.
The height of the engagement protrusion 15a is lower than the height of the fitting protrusion 13a, 14a.

An engagement groove 15b is formed between the engagement protrusion 15a and the edge of the front side surface 12a. The engagement groove 15b is open toward the front side (lower side in FIG. 1) and is recessed toward the back side (upper side in FIG. 1). The cross-sectional shape of the engagement groove 15b is formed into an approximately quarter-circular arc shape. The inner circumferential surface of the engagement groove 15b constitutes a stepped surface between the first end side portion 3a and the front side surface 12a of the wide band plate portion 12.
The depth of the engagement groove 15b is shallower than the depth of the engagement grooves 13b and 14b.

A telescopic portion 17 is provided between the narrow strip portion 11 and the first telescopic stop portion 15, and further between the first fitting portion 13 and the first telescopic stop portion 15.
The extensible portion 17 is formed in a U-shaped (bellows-shaped) cross section that bulges toward the back side (upper side in FIG. 1), and is expandable and retractable in the width direction (left and right in FIG. 1) (FIG. 3(d)). One end portion (the left end portion in FIG. 1) of the expandable portion 17 is continuous with the narrow strip portion 11. The other end portion (the right end portion in FIG. 1) of the expandable portion 17 is arranged at the same position in the width direction (left and right in FIG. 1) as the engagement protrusion 15a of the first expansion stopper portion 15.
An internal space 17c of the expandable portion 17 having a U-shaped cross section is opened on the front side of the band member 3.
As shown in FIG. 3(b), in the rehabilitated pipe 2 (spiral pipe) formed by winding the band member 3, the internal space 17c of the expandable part 17 is formed by the wide band plate part 12 at the second end side part 3b. It's blocked.

As shown in FIGS. 1 and 3(a), the second end side portion 3b of the strip member 3 is provided with a second fitting portion 14 and a second expansion/contraction stop portion 16.
The second fitting portion 14 is arranged closer to the band center portion 3c than the portion 3d of the second end side portion 3b that overlaps with the elastic portion 17. The second fitting part 14 has, for example, three (plural) fitting protrusions 14a and two (plural) fitting grooves 14b, and has an uneven shape complementary to the first fitting part 13. It is formed in a cross-sectional shape. The fitting protrusion 14a projects from the wide band plate portion 12 to the back side (upper side in FIG. 1). A locking claw portion 14f is formed on at least a portion of the fitting protrusion 14a.

The fitting groove 14b is opened toward the back side (upper side in FIG. 1) and is recessed toward the wide band plate portion 12.
The fitting protrusions 14a and the fitting grooves 14b are arranged alternately in the width direction (left and right in FIG. 1).

The second expansion/contraction stopper 16 is spaced apart from the second fitting part 14 toward the end side in the width direction of the second end side part 3b (right side in FIG. (upper surface). The second expansion/contraction stopper 16 has an engagement groove 16b and an engagement protrusion 16a, and is formed into an uneven shape that is gentler than the fitting parts 13 and 14 or smaller than the fitting parts 13 and 14. There is. The engagement groove 16b is open to the back side (upper side in FIG. 1) and recessed to the front side (lower side in FIG. 1). The cross-sectional shape of the engagement groove 16b is approximately a right triangle, that is, a non-obtuse triangle.
The depth of the engagement groove 16b is shallower than the depth of the engagement grooves 13b and 14b.

A portion of the second end side portion 3b on the tip side in the width direction from the engagement groove 16b constitutes an engagement protrusion 16a having a cross section of approximately a quarter circle.
The height of the engagement protrusion 16a is lower than the height of the fitting protrusion 13a, 14a.

As shown in FIG. 3(b), in a rehabilitated pipe 2 (helical pipe) formed by winding a band member 3, a fitting portion 13 at a first end side portion 3a and a second end side portion 3b overlapped with each other. , 14 are fitted together, and the expansion/contraction stoppers 15, 16 are engaged with each other. As a result, the first end side portion 3a and the second end side portion 3b are joined.

The fitting parts 13 and 14 constitute a fitting mechanism 2a. In the fitting mechanism 2a, the fitting protrusion 13a is fitted into the fitting groove 14b, and the fitting protrusion 14a is fitted into the fitting groove 13b. The locking claws 13f and 14f are hooked together. Thereby, the fitting strength of the fitting parts 13 and 14 in the width direction and thickness direction is sufficiently high. In particular, it is possible to reliably prevent the wound strip member 3 from returning to its stretched state before being wound.
Note that the width direction of the strip member 3 is along the pipe axis direction of the rehabilitated pipe 2. Strictly speaking, the width direction is inclined by the lead angle with respect to the tube axis direction.
The thickness direction of the strip member 2 is along the radial direction of the spiral tube 2.

The expansion and contraction prevention parts 15 and 16 constitute an expansion and contraction mechanism 2b. In the expansion/contraction prevention mechanism 2b, the engagement protrusion 15a is fitted into the engagement groove 16b, and the engagement protrusion 16a is fitted into the engagement groove 15b. The engagement protrusions 15a, 16a can be inserted into and removed from the engagement grooves 16b, 15b along the tube diameter direction (thickness direction) (FIG. 3(c)). Moreover, the engaging protrusions 15a and 16a cannot be locked to the withdrawal side. That is, on the outer surfaces of the engagement protrusions 15a, 16a and the inner surfaces of the engagement grooves 16b, 15b, there are no hooks such as claws, protrusions, warps, steps, etc. that would prevent the engagement protrusions 15a, 16a from being pulled out.
As a result, the first and second expansion/contraction stoppers 15 and 16 can be disengaged from each other so that they are restricted in the tube axis direction (width direction) while allowing relative displacement in the tube diameter direction (thickness direction). engaged.

The engagement strength between the expansion/contraction stoppers 15 and 16 in the tube axis direction (width direction) is smaller than the fit strength between the fitting portions 13 and 14 in the tube axis direction (width direction).
The engagement strength in the tube radial direction (thickness direction) between the expansion/contraction stoppers 15 and 16 is almost non-existent, and is much smaller than the fitting strength in the tube radial direction (thickness direction) between the fitting portions 13 and 14. This is sufficiently smaller than the engagement strength between the stop portions 15 and 16 in the tube axis direction (width direction).

As shown in FIG. 3(b), in the rehabilitated pipe 2 made of the band-shaped member 3, the fitting mechanism 2a made of the fitting parts 13 and 14, and the expansion and contraction stop mechanism 2b made of the expansion and contraction parts 15 and 16, They are arranged to face each other in the tube axis direction. A telescopic portion 17 is arranged to be sandwiched between the fitting mechanism 2a and the telescopic stopper mechanism 2b.

As shown in FIG. 2(a), the aged existing pipe 1 to be rehabilitated may have a non-straight portion 1c such as a bent portion (curved portion) or a step. In the non-straight part 1c, the helical pitch of the rehabilitated pipe 2 (helical pipe) is different from that in the straight part. The helical pitch is large in the outer circumferential side part 1f of the non-straight part 1c, and the helical pitch is small in the inner circumferential side part 1e of the non-straight part 1c. Therefore, a tensile force acts on the rehabilitated pipe 2 at the outer circumferential side part 1f along the pipe axis direction (width direction of the strip member 3), and on the rehabilitated pipe 2 at the inner circumferential side part 1e, a tensile force acts along the pipe axis direction. compressive force tends to act.
The force in the tube axis direction (width direction) is sufficiently small compared to the force generated during an earthquake, and is less than a predetermined magnitude. Therefore, not only can the fitting portions 13 and 14 exert sufficient resistance to maintain the fitting, but also the expansion and contraction prevention portions 15 and 16 can maintain the engaged state. Thereby, expansion and contraction of the extensible portion 17 can be prevented.

In response to the helical pitch difference between the outer circumferential side part 1f and the inner circumferential side part 1e, the fitting parts 13 and 14 can be displaced or elastically deformed within the range of mutual clearance while maintaining fitting. It can be absorbed by It can also be absorbed to some extent by displacement or elastic deformation of the expansion/contraction stoppers 15 and 16.

In this manner, according to the rehabilitated pipe 2 made of the band-shaped member 3, the expansion/contraction mechanism 2b maintains the engaged state even in the non-straight portions 1c such as curved portions or steps, thereby preventing the expansion/contraction portion 17 from expanding or contracting. be done. Therefore, the internal space 17c of the extensible portion 17 is closed by the second end side portion 3b and can be maintained in a state where it is not exposed to the inner circumferential surface of the rehabilitated pipe 2. As a result, the smoothness of the inner peripheral surface of the rehabilitated pipe 2 can be maintained.
Note that the engagement of the expansion/contraction prevention mechanism 2b may be released at a sharp curved portion with a large curvature (see FIG. 3(c)).

As shown in FIG. 3(c), when a large external force greater than a predetermined value is applied to the rehabilitated pipe 2 due to an earthquake or the like, the expansion and contraction mechanism 2b is disengaged, and the expansion and contraction of the expansion and contraction portion 17 is allowed. The disengagement absorbs energy such as earthquakes. Therefore, the burden on the stretchable section 17 is reduced, and tearing of the stretchable section 17 can be prevented.
Furthermore, as shown in FIG. 3(d), by expanding and contracting the expandable portion 17, it is possible to further absorb energy such as earthquakes. Thereby, the fitted state of the fitting mechanism 2a can be maintained reliably. Therefore, the distribution performance for sewage etc. can be maintained.

Next, other embodiments of the present invention will be described. In the following embodiments, the same reference numerals are given to the same reference numerals in the drawings, and the explanation thereof will be omitted as appropriate.
<Second embodiment (Fig. 4)>
As shown in FIG. 4(a), in the strip member 3B of the second embodiment, narrow strip portions 11a and 11b are provided on both sides of an elastic portion 17 having a U-shaped cross section (bellows shape). There is. A first expansion/contraction stopper 15 is provided on the narrow band plate portion 11b closer to the band central portion 3c than the expansion/contraction portion 17. The first expansion/contraction stopper 15 is raised in an arc shape from the narrow strip portion 11b toward the back side (upper side in the figure). One engagement groove 15b is formed in the first expansion/contraction stopper 15. The engagement groove 15b is recessed from the front surface (lower surface in FIG. 4) of the narrow strip portion 11b toward the back surface (upper surface in the figure). The cross-sectional shape of the engagement groove 15b is formed into a substantially isosceles triangular shape (non-obtuse triangular shape).
The depth of the engagement groove 15b is shallower than that of the engagement grooves 13b and 14b.
The number of engagement grooves 15b in the first expansion/contraction stopper 15 is smaller than the number of engagement grooves 13b in the first fitting part 13 and smaller than the number of fitting grooves 14b in the second fitting part 14. .

The second expansion/contraction stopper 16 is constituted by an engaging protrusion 16a having an isosceles triangular (non-obtuse triangular) cross section that protrudes from the back side (upper side in the figure) of the wide band plate portion 12. .
The height of the engagement protrusion 16a is lower than the fitting protrusion 13a, 14a.
The number (one) of the engagement protrusions 16a in the second expansion/contraction stopper 16 is less than the number of the engagement protrusions 13a of the first fitting part 13, and the number of engagement protrusions 14a of the second fitting part 14 less than the number of

As shown in FIG. 4(b), in the rehabilitated pipe 2B (helical pipe) manufactured from the strip member 3B, the engagement protrusion 16a is arranged in the pipe radial direction (thickness direction) with respect to the engagement groove 15b. It can be inserted and removed, and it is fitted into the extraction side without being locked. As a result, the expansion/contraction stoppers 15 and 16 are engaged with each other such that they are restricted in the tube axis direction (width direction) while allowing relative displacement in the tube diameter direction (thickness direction).
Due to a force of less than a predetermined magnitude in the non-straight portion 1a, etc., the expansion/contraction stoppers 15, 16 do not come off each other, and the engaged state of the expansion/contraction stop mechanism 2b is maintained. This prevents expansion and contraction of the expansion and contraction portion 17.
As shown in FIG. 4(c), when a large external force greater than a predetermined value is applied to the rehabilitated pipe 2B due to an earthquake or the like, the expansion/contraction prevention mechanism 2b is disengaged and the expansion/contraction portion 17 is allowed to expand/contract.

<Third embodiment (Fig. 5)>
As shown in FIG. 5(a), in the band member 3C of the third embodiment, the cross-sectional shape of the engagement groove 15c and the engagement protrusion 16c is different from that of the band member 3B of the second embodiment. . The engagement groove 15c of the strip member 3C has a constant width from the groove opening on the front surface (lower surface in FIG. 5(a)) of the narrow strip portion 11b to near the bottom of the groove on the back side (upper surface in the same figure). It is a straight groove with the width of the groove. The groove bottom is formed in an arc shape.
The depth of the engagement groove 15c is approximately the same as the depth of the engagement grooves 13b, 14b, but may be shallower than the engagement grooves 13b, 14b.

The engagement protrusion 16c of the strip member 3C is narrow at the root portion connected to the wide strip portion 12, and widens as it approaches the protruding end portion facing the back side (upper side in the figure). Both side surfaces of the engagement protrusion 16c are inclined so as to be spaced apart from each other toward the protruding end. The protruding end portion of the engagement protrusion 16c is formed in an arc shape. The maximum width near the protruding end of the engagement protrusion 16c is approximately the same as the width of the straight portion of the engagement groove 15c.
The height of the engaging protrusion 16a is approximately the same as the height of the fitting protrusions 13a, 14a, but may be lower than the fitting protrusions 13a, 14a.

As shown in FIG. 5(b), in the rehabilitated pipe 2C (helical pipe) manufactured from the strip member 3C, the engagement protrusion 16c is arranged in the pipe radial direction (thickness direction) with respect to the engagement groove 15c. It can be inserted and removed, and it is fitted into the extraction side without being locked. Even if both sides of the engagement protrusion 16c are warped, it will not get caught on the inner surface of the engagement groove 15c. Even if friction occurs between the maximum width portion of the engagement protrusion 16c and the inner surface of the engagement groove 15c, there is no problem in inserting and removing the engagement protrusion 16c.
Due to a force of less than a predetermined magnitude in the non-straight portion 1a, etc., the expansion and contraction stops 15 and 16 do not come off each other, and the engaged state of the expansion and contraction mechanism 2b is maintained, thereby preventing the expansion and contraction of the expansion and contraction part 17. .
As shown in FIG. 5(c), when a large external force greater than a predetermined value is applied to the rehabilitated pipe 2C due to an earthquake or the like, the expansion/contraction prevention mechanism 2b is disengaged and the expansion/contraction portion 17 is allowed to expand/contract. At this time, the engaging protrusion 16c may be deformed, such as being tilted.

<Fourth embodiment (Fig. 6)>
As shown in FIG. 6(a), in the strip member 3D of the fourth embodiment, a narrow strip portion 11b is provided between the elastic portion 17 and the wide strip portion 12. A first expansion/contraction stopper 15 is provided at 11b. The first expansion/contraction stopper 15 has one engagement groove 15e (groove). The number of engagement grooves 15e in the first expansion/contraction stopper 15 is smaller than the number of engagement grooves 13b in the first fitting part 13 and smaller than the number of fitting grooves 14b in the second fitting part 14. .

As shown in FIGS. 6(a) and 6(b), the cross-sectional shape of the engaging groove 15e is similar to the cross-sectional shape of the fitting grooves 13b and 14b. The cross-sectional area of the engaging groove 15e is smaller than the cross-sectional area of each of the fitting grooves 13b and 14b. The depth of the engagement groove 15e is shallower than that of the engagement grooves 13b and 14b. A stepped locking claw portion 15f is formed on the inner circumferential surface of the engagement groove 15e. The cross-sectional area and protrusion amount of the locking claw portion 15f are smaller than those of the locking claw portions 13f and 14f.

The second expansion/contraction stopper 16 of the band member 3D has one engagement protrusion 16e (protrusion). The number of engagement protrusions 16e in the second expansion/contraction stopper 16 is less than the number of engagement protrusions 13a of the first fitting part 13 and less than the number of fitting protrusions 14a of the second fitting part 14. .
The cross-sectional shape of the engagement protrusion 16e is similar to the cross-sectional shape of the fitting protrusion 13a, 14a. The cross-sectional area of the engagement protrusion 16e is smaller than the cross-sectional area of each fitting protrusion 13a, 14a. The protruding height of the engagement protrusion 16e is lower than that of the fitting protrusions 13a and 14a. A locking claw portion 16f is formed on one side of the engagement protrusion 16e. The cross-sectional area and protrusion amount of the locking claw portion 16f are smaller than those of the locking claw portions 13f and 14f.

As shown in FIG. 6(b), in the rehabilitated pipe 2D (helical pipe) manufactured from the band-shaped member 3D, the expansion/contraction stop portion 15 is inserted into the engagement concave groove 15e. , 16 are engaged with each other. By locking the locking claws 15f and 16f, the expansion/contraction stoppers 15 and 16 are prevented from coming off in the tube diameter direction (thickness direction). The retaining force (engaging strength in the tube radial direction) between the expansion/contraction preventing portions 15 and 16 is sufficiently smaller than the retaining force (fitting strength in the tube radial direction) between the fitting portions 13 and 14.

Even if a force of less than a predetermined magnitude is applied to the non-straight portion 1a, etc., the expansion/contraction stops 15, 16 will not come off each other, the expansion/contraction mechanism 2b will remain engaged, and the expansion/contraction of the expansion/contraction portion 17 will be prevented. Ru.
As shown in FIG. 6(c), when a large external force greater than a predetermined value is applied due to an earthquake or the like, the engagement protrusion 16e is disengaged from the engagement groove 15e, and the engagement of the expansion/contraction prevention mechanism 2b is released. , Earthquake energy is absorbed by the expansion and contraction of the expansion and contraction portion 17.

<Fifth embodiment (FIG. 7)>
As shown in FIG. 7(a), in the band-shaped member 3E of the fifth embodiment, the sizes of the engagement grooves 15e and the engagement protrusions 16e are different from those of the band-shaped member 3D of the fourth embodiment. In the strip member 3E, the size (cross-sectional area and depth) of the engagement groove 15e of the first expansion/contraction stopper 15 is approximately the same as the size of each of the fitting grooves 13b and 14b. In addition, the cross-sectional shape of the engaging groove 15e is similar to the cross-sectional shape of the fitting grooves 13b and 14b. The number of grooves 15e in the first expansion/contraction stopper 15 is one, which is smaller than the number of fitting grooves 13b and 14b.

The size (cross-sectional area and height) of the engagement protrusion 16e of the second expansion/contraction stopper 16 in the strip member 3E is approximately the same as the size of each of the fitting protrusions 13a, 14a. In addition, the cross-sectional shape of the engagement protrusion 16e is similar to the cross-sectional shape of the fitting protrusion 13a, 14a. The number of engagement protrusions 16e in the second expansion/contraction stopper 16 is one, which is less than the number of fitting grooves 13b, 14b.

As shown in FIG. 7(b), in the rehabilitated pipe 2E (helical pipe) manufactured from the strip member 3E, the engagement protrusion 16e is inserted into the engagement groove 15e, and the expansion/contraction stop portions 15, 16 are inserted into the engagement groove 15e. They are engaged. By locking the locking claws 15f and 16f, the expansion/contraction stoppers 15 and 16 are prevented from coming off in the tube diameter direction (thickness direction). The retaining force (engaging strength in the pipe radial direction) between the expansion/contraction preventing parts 15 and 16 is greater than the retaining force (fitting strength in the pipe radial direction) between the fitting parts 13 and 14. It is smaller because there are fewer grooves.
In the fifth embodiment as well, the expansion and contraction parts 15 and 16 do not come apart due to a force less than a predetermined magnitude, and the expansion and contraction part 17 is maintained in the engaged state of the expansion and contraction mechanism 2b. is prevented.
As shown in FIG. 7(c), when a large external force greater than a predetermined value is applied due to an earthquake or the like, the engagement protrusion 16e is disengaged from the engagement groove 15e, and the engagement of the expansion/contraction prevention mechanism 2b is released. , Earthquake energy is absorbed by the expansion and contraction of the expansion and contraction portion 17.

In addition, as shown in FIG. 7(d), when manufacturing the spiral tube 2, in the non-straight portions 1c such as bent portions and steps, there is a gap between the second fitting portion 14 and the second expansion/contraction stop portion 16. The wide strip portion 12 may be cut. As a result, expansion and contraction deformation of the extensible portion 17 is allowed, and the helical pitch can be easily increased at the outer circumferential side portion 1f of the non-straight portion 1c, and the helical pitch can be easily decreased at the inner circumferential side portion 1e. Therefore, even if the pipe has a sharp curve with a large curvature, the helical pipe 2 can be easily manufactured in accordance with the curve.
In addition, in embodiments other than the fifth embodiment (FIG. 7), the wide band plate portion 12 between the second fitting portion 14 and the second expansion/contraction stop portion 16 is May be cut.

<Sixth embodiment (FIG. 8)>
As shown in FIG. 8(a), in the band member 3F of the sixth embodiment, the expandable portion 17 includes two (plural) expandable portions 17d, 17e. Each of the expandable and contractible portions 17d and 17e is formed in a U-shaped cross section that bulges toward the back side (upper side in FIG. 8(a)). Two stretchable parts 17d and 17e are lined up and connected in the width direction.

The first expansion/contraction stopper 15 of the band member 3F has a first engagement protrusion 15d. The engagement protrusion 15d is formed in a rectangular cross-sectional shape, and extends from the end of the stretchable portion 17e on the band center portion 3c side that is continuous with the stretchable portion 17d to the front side (lower side in FIG. 8(a)). It is projected to. That is, the first expansion/contraction stopper 15 is provided at the intermediate portion of the expansion/contraction section 17 .

The second expansion/contraction stopper 16 of the band member 3F has a second engagement protrusion 16d. The engagement protrusion 16 projects from the wide band plate portion 12 to the back side (upper side in FIG. 8(a)). The second engagement protrusion 16d is formed to have an approximately right triangular cross-sectional shape (non-obtuse triangular shape) having an abutment surface 16h and an inclined surface 16g. The contact surface 16h is substantially orthogonal to the back surface of the wide strip portion 12 and is directed toward the second fitting portion 14.

As shown in FIG. 8(b), in the rehabilitated pipe 2F (helical pipe) manufactured from the band-shaped member 3F, the engagement protrusion 16d is inserted into the central extensible portion 17e, so that the band The contact surface 16h abuts against the engagement protrusion 15d from the center portion 3c side, that is, from the side opposite to the first fitting portion 13 across the engagement protrusion 15d. As a result, the expansion/contraction stoppers 15 and 16 are engaged with each other such that they are restricted in the tube axis direction (width direction) while allowing relative displacement in the tube diameter direction (thickness direction). As a result, the engagement of the expansion and contraction mechanism 2b is not released due to a force less than a predetermined magnitude, and expansion and deformation of the end side expandable portion 17d in the width direction (tube axis direction) is prevented. There is.
An end of the wide band plate portion 12 is abutted against a corner portion 3e where the stretchable portion 17e and the band center portion 3c intersect. This prevents the central extensible portion 17e from shrinking and deforming. Elongation and deformation of the central expandable portion 17e is allowed.

As shown in FIG. 8(c), when a large external force greater than a predetermined value is applied due to an earthquake or the like, the contact surface 16h of the engagement protrusion 16d comes off the engagement protrusion 15d, and the expandable parts 17d, 17e Earthquake energy is absorbed by expanding and contracting.

<Seventh embodiment (FIG. 9)>
As shown in FIG. 9(a), in the band member 3G of the seventh embodiment, at least a portion of the front surface (lower surface in FIG. 9(a)) of the narrow center band portion 11b has a first elastic A first uneven surface 21 (rough surface) is formed as a stop portion. On the first uneven surface 21, a large number of small protrusions 21a (small protrusions) and a large number of small grooves 21b (small recesses) are formed alternately in the width direction.

A second uneven surface 22 (rough surface) is formed on a part of the back side (upper surface in FIG. 9(a)) of the wide band plate portion 12 of the band member 3G as a second expansion/contraction stopper. On the second uneven surface 22, a large number of small protrusions 22a (small protrusions) and a large number of small grooves 22b (small recesses) are formed alternately in the width direction.

As shown in FIG. 9(b), in the rehabilitated pipe 2G (helical pipe) made from the band-shaped member 3G, the uneven surfaces 21 and 22 are in contact with each other to form an expansion/contraction prevention mechanism 2b. As a result, frictional resistance acts against force in the tube axis direction (width direction). Therefore, the engagement of the expansion and contraction mechanism 2b is not released by a force less than a predetermined magnitude, and expansion and contraction of the expansion and contraction portion 17 is prevented.
As shown in FIG. 9(c), when a large external force greater than a predetermined value is applied to the spiral tube due to an earthquake or the like, the engagement state due to friction between the uneven surfaces 21 and 22 is released, and the expandable portion 17 can be expanded and contracted. Therefore, it can absorb earthquake energy.

<Eighth embodiment (FIG. 10)>
As shown in FIG. 10(a), in the band member 3H of the eighth embodiment, the material of at least one of the expansion/contraction prevention parts 15 and 16 is softer than that of the fitting parts 13 and 14.
Specifically, except for the second expansion/contraction stopper 16 at the end in the width direction of the wide band plate part 12 and its surrounding area, it is made of hard resin such as polyvinyl chloride. Therefore, the fitting parts 13 and 14 and the first expansion/contraction stopper part 15 are made of the hard resin.
The second expansion/contraction stopper 16 and its surrounding portion are made of soft resin, rubber, or elastomer, and constitute a soft portion 12g.
The band member 3H is formed by coextrusion molding or the like.

As shown in FIG. 10(b), in the rehabilitated pipe 2H (helical pipe) manufactured from the strip member 3H, the hard fitting parts 13 and 14 are fitted together, and the hard first expansion stopper The portion 15 and the second soft expansion/contraction stop portion 16 are engaged with each other. This prevents the expansion and contraction stops 15 and 16 from coming off each other due to a force less than a predetermined magnitude, thereby preventing expansion and contraction of the expansion and contraction part 17.

As shown in FIG. 10(c), when a large external force greater than a predetermined value is applied due to an earthquake or the like, the soft portion 21g including the second expansion stopper 16 is easily deformed, causing the expansion stoppers 15 and 16 to is disengaged. This allows the expandable portion 17 to expand and contract, thereby absorbing earthquake energy.
Note that in FIG. 10, the cross-sectional shape of the band-like member 3H is the same as that of the first embodiment (FIG. 1), but it may be the same as the cross-sectional shape of the band-like member of other embodiments. The strip member 3H may have a unique cross-sectional shape.

<Ninth embodiment (FIG. 11)>
As shown in FIG. 11, in the ninth embodiment, an adhesive 30 is interposed between the first and second fitting parts 13 and 14 of the spiral tube 2. The fitting parts 13 and 14 are bonded to each other with an adhesive 30. The adhesive 30 is preferably filled into the fitting groove 13b or the fitting groove 14b during pipe manufacturing.
This increases the joint strength (fitting strength) of the mating parts 13 and 14, and prevents the mating parts 13 and 14 from being uncoupled even if a large external force exceeding a predetermined level is applied due to an earthquake or the like. can be reliably prevented. When the engagement strength between the expansion and contraction stops 15 and 16 becomes relatively low and a large external force greater than the predetermined value is applied, the engagement of the expansion and contraction mechanism 2b is reliably released and the expansion and contraction part 17 can be expanded and contracted. becomes.
In addition, in FIG. 11, the cross-sectional shape of the band-like member is the same as that of the first embodiment (FIG. 1), but it may be the same as the cross-sectional shape of the band-like member of other embodiments, or it may have a unique cross-sectional shape. It may be shaped.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit thereof.
For example, the expandable part is not limited to a bellows shape such as a U-shaped cross section, but may be a sliding type.
One of the fitting parts 13 and 14 has a fitting groove and no fitting convex part, and the other of the fitting parts 13 and 14 has a fitting convex part and a fitting groove. It is not necessary to have .

INDUSTRIAL APPLICATION This invention is applicable to the rehabilitation technique of buried pipes, such as an aging sewer pipe, for example.

1 Existing pipe 1c Non-straight part 2 Rehabilitation pipe (spiral pipe)
2B-2H Rehabilitation pipe (spiral pipe)
2a Fitting mechanism 2b Expansion stop mechanism 3 Band-like members 3B to 3H Band-like member 3a First end side portion 3b Second end side 3d Portion overlapping with the elastic portion 10 Band body 11 Narrow band portion 12 Wide band portion 12g Soft Portion 13 First fitting part 13a Fitting protrusion 13b Fitting groove 14 Second fitting part 14a Fitting protrusion 14b Fitting groove 15 First expansion/contraction stop part 15a, 15d Engagement protrusion 15b, 15c, 15e Engagement groove 16 Second expansion/contraction stop portion 16a, 16c, 16d, 16e Engagement protrusion 16b Engagement groove 17 Expandable portion 21 Uneven surface (first expansion/contraction stop portion)
22 Uneven surface (second expansion/contraction stopper)
30 Adhesive

Claims (11)

It is wound in a spiral shape, and the parts of the first end side part and the second end side part on both sides of the center part in the width direction, which are shifted by one circumference from each other, are overlapped in the thickness direction and joined. A belt-shaped member that becomes a pipe,
an expandable part that is provided on the first end side part so as to overlap the part of the second end side part that is shifted by one round due to the winding, and that is expandable and contractible in the width direction;
a first fitting part provided on the end side in the width direction of the elastic part in the first end side part;
a first expansion/contraction stopper provided on the side of the first end side closer to the central portion or within the expansion/contraction portion so as to overlap with the portion of the second end side portion that is shifted by one turn due to the winding; ,
a second fitting portion that is provided closer to the center portion than a portion of the second end side portion that overlaps with the expandable portion, and that is capable of fitting with the first fitting portion;
is provided apart from the second fitting part in the second end side part on the side opposite to the central part side in the width direction, and overlaps with the part shifted by one turn on the first end side part due to the winding. a second expansion/contraction stopper that is releasably engaged with the first expansion/contraction stopper to stop the expansion/contraction of the expansion/contraction part;
The strength of the engagement in the width direction between the first and second expansion/contraction stop portions is smaller than the strength of the fit in the width direction between the first and second fitting portions,
The strength of the engagement in the thickness direction between the first and second expansion/contraction prevention parts is smaller than the strength of the engagement in the thickness direction between the first and second fitting parts, and A belt-like member for a helical pipe, characterized in that the strength of engagement in the width direction between the stop portions is smaller than the strength of the engagement in the width direction. 2. The strip for a helical tube according to claim 1, wherein the first and second expansion/contraction stop portions are engageable with each other so as to permit relative displacement in the thickness direction while being restricted in the width direction. Element . At least one of the first and second expansion/contraction stop portions has an engagement groove, and at least the other is capable of being inserted into and removed from the engagement groove in the thickness direction and cannot be locked to the withdrawal side in the thickness direction. The band member for a spiral pipe according to claim 1 or 2, characterized in that it has an engaging protrusion. the first expansion/contraction stopper has a first engagement protrusion;
Any one of claims 1 to 3, wherein the second expansion/contraction stopper has a second engagement protrusion that abuts the first engagement protrusion from a side opposite to the first fitting part. The belt-shaped member for a spiral tube according to item 1. At least one of the first and second fitting portions has a fitting groove, and at least the other has a fitting protrusion that fits into the fitting groove,
At least one of the first and second expansion/contraction stoppers has an engagement groove, at least the other has an engagement protrusion that fits into the engagement groove, and the engagement groove is connected to the fitting groove. The strip member for a helical pipe according to any one of claims 1 to 4, wherein the engagement protrusion is shallower or lower than the fitting protrusion. At least one of the first and second fitting portions has a plurality of fitting grooves, and at least the other has a plurality of fitting protrusions that fit into the fitting grooves,
At least one of the first and second extension stop portions has an engagement groove, at least the other has an engagement protrusion that fits into the engagement groove, and the engagement groove and the engagement protrusion The band member for a spiral pipe according to any one of claims 1 to 5, wherein the number of the fitting grooves and the fitting protrusions is smaller than the number of the fitting grooves and the fitting protrusions. The helical pipe according to any one of claims 1 to 6, wherein the first and second expansion/contraction prevention parts have uneven surfaces that contact each other and generate frictional resistance in the width direction. Band-shaped member. The first fitting part and the second fitting part are made of hard resin, and at least one of the second expansion and contraction stopping part and the first expansion and contraction stopping part is connected to the first fitting part and the second fitting part. The strip member for a spiral tube according to any one of claims 1 to 7, wherein the strip member is softer than the helical tube. further comprising a flat band-shaped wide band plate portion extending from the center portion in the width direction of the band-shaped member to the second end side portion,
A flat strip-like narrow strip portion narrower than the wide strip portion is provided at the first end side portion, and between the narrow strip portion and the wide strip portion, The strip member for a helical pipe according to any one of claims 1 to 8, wherein a step is formed in the wide strip portion with a height equal to the thickness of a portion overlapping the first end side portion. . The strip member for a spiral tube according to any one of claims 1 to 9 is wound spirally, and includes a fitting mechanism including the first fitting part and the second fitting part, and the first expansion/contraction stop part. and an expansion/contraction stop mechanism consisting of the second expansion/contraction stop part are arranged so as to face each other in the tube axis direction, and the expansion/contraction part is arranged so as to be sandwiched between the fitting mechanism and the expansion/contraction stop mechanism. A spiral tube characterized by: The helical tube according to claim 10, wherein the first and second fitting portions are bonded to each other with an adhesive.

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