JP6805041B2 - Band-shaped member for spiral tube and spiral tube - Google Patents

Description

The present invention relates to a strip-shaped member and a spiral pipe to be a spiral pipe, and is particularly suitable for a rehabilitation pipe lined on the inner circumference of an existing pipe such as an aged sewer pipe, a water supply pipe, and an agricultural water pipe. Regarding pipes.

In recent years, measures against aging of existing pipes such as sewer pipes have been required. As an example of countermeasures, a construction method in which a rehabilitation pipe is lined on the inner circumference of the existing pipe to rehabilitate the existing pipe is known (see, for example, Patent Documents 1 and 2). The rehabilitation tubes of these patent documents and the like are composed of spiral tubes made of strip-shaped members. The strip-shaped member is spirally wound along the inner circumference of the existing pipe, and a pair of adjacent edges are joined to each other with a difference of one circumference.

Generally, a fitting groove is formed on one of the pair of edges of this type of band-shaped member, and a fitting ridge is formed on the other (see Patent Document 1 and the like). The fitting ridge is fitted in the fitting groove. For example, a rubber sealing member is provided near the fitting ridge in the flat band portion of the band-shaped member. When the band-shaped member is spirally wound to engage the fitting ridge and the fitting groove, the rubber sealing member is sandwiched between the parts of the flat band that are different from each other, resulting in watertightness (seal) of the joint. Gender) is secured.

In Patent Document 2, a string-shaped water blocking member is provided on any one of the pair of fitting portions of the strip-shaped member. The string-shaped water blocking member includes a core material and a covering material. The core material is made of metal or glass fiber. The dressing wraps the core material. The covering material is made of rubber. When the strip-shaped member is spirally wound to fit a pair of fitting portions on adjacent edges that are one circumference apart, the covering material is compressed and an elastic force acts, and the locking claws of the pair of fitting portions are fitted to each other. Are strongly pressed against each other.

Japanese Unexamined Patent Publication No. 2014-015946 (FIGS. 6 to 7) Japanese Unexamined Patent Publication No. 2016-0872828 (FIGS. 1 to 3 and 9)

In this type of strip-shaped member, foreign matter such as sand or fine particles in sewage or agricultural water may enter the fitting groove during construction in an existing pipe such as a sewer pipe. Then, the fitting ridges cannot be sufficiently fitted, and fitting failure is likely to occur. In addition, the seal member cannot be sandwiched well, and the water stopping property of the joint may be impaired.

In the strip-shaped member of FIGS. 1 to 3 of Patent Document 2, a storage recess for the string-shaped water blocking member is formed separately from the fitting groove with a locking claw for preventing the fitting ridge from coming off. ing. Even if the string-shaped water blocking member can prevent foreign matter such as sand from entering the accommodating recess, there is a possibility that foreign matter such as sand may enter the fitting groove.
In the form of FIG. 9 of Patent Document 2, a string-shaped water blocking member is housed in the deep bottom of the fitting groove with a locking claw, but the string-shaped water stop member is required to secure a fitting space for the fitting ridges. The water blocking member must have a small cross section. Therefore, foreign matter such as sand can still enter the fitting groove.

In view of such circumstances, the present invention prevents foreign matter such as sand from entering the fitting groove when not fitted in the band-shaped member for the spiral tube, thereby preventing poor fitting and after fitting. The purpose is to ensure water stoppage.

In order to solve the above-mentioned problems, the band-shaped member for a spiral tube according to the present invention is a band-shaped member for a spiral tube that should be a spiral tube by being spirally wound and joining a pair of adjacent edges that are adjacent to each other in a spiral shape. There,
A first fitting portion formed along one of the pair of edges,
A second fitting portion formed along the other of the pair of edge portions and capable of concave-convex fitting with the first fitting portion,
A foam seal member made of a foam material packed in a fitting groove formed in one of the first fitting portion and the second fitting portion, and
The foam sealing member is formed on the inner surface of the fitting groove by fitting the fitting ridge formed on the other side of the first fitting portion and the second fitting portion into the fitting groove. It is characterized in that it can be compressed until it fits within the gap between the fitting ridge and the fitting ridge, and the sealing property can be exhibited by the compression.

By filling the fitting groove with the foam seal member, it is possible to prevent foreign matter such as sand from entering the fitting groove that has not been fitted. When the first and second fitting portions are fitted to each other, the foam seal member in the fitting groove is sufficiently compressed as the fitting ridge enters, so that the fitting ridge is deeply inserted into the fitting groove. It can be fitted securely. As a result, the prevention of foreign matter intrusion when not fitted and the compression deformation of the foam seal member when mated are combined to prevent poor fitting. Moreover, since the compressed foam seal member exhibits sealing properties, the space between the first fitting portion and the second fitting portion can be hermetically sealed. That is, since the foam seal member is brought into close contact with the outer surface of the fitting ridge and the inner surface of the fitting groove, water permeation between the outer surface of the fitting ridge and the inner surface of the fitting groove and the foam seal member can be prevented. Further, by crushing the air bubbles in the foam seal member, water permeation inside the foam seal member can be prevented.

It is preferable that the foam seal member includes a foam core portion having closed cells or open cells, and a non-foamed skin layer that encloses the foam core portion.
Depending on the foam core portion, the cross-sectional area change rate or volume change rate before and after compression of the foam seal member can be increased. That is, the foam seal member can have a large cross-sectional area before compression, and by sufficiently filling the fitting groove when not fitted with the foam seal member, it is possible to reliably prevent the intrusion of foreign matter such as sand. When the first and second fitting portions are fitted to each other, the foam seal member can be sufficiently compressed. As a result, it is possible to reliably prevent fitting defects and ensure sealing performance. Moreover, the non-foaming skin layer can further enhance the sealing property.
The cell structure of the foam core is preferably closed cells.

The vicinity of the opening of the fitting groove is a narrow portion narrower than the fitting groove portion on the inner side of the fitting groove.
Before the fitting, it is preferable that the foam seal member closes the narrow portion from the back side.
As a result, foreign matter such as sand can be reliably prevented from entering the fitting groove portion. In the fitted state between the first and second fitting portions, the narrow portion can prevent the fitting ridges from coming off.

It is preferable that the cross-sectional area of the foam seal member becomes 10% to 80% of the uncompressed state by the compression.
The ratio (S1 / S2) of the uncompressed cross-sectional area S1 of the foam seal member to the compressed cross-sectional area S2 is preferably about 0.5 to 5 times the foaming magnification of the foam seal member.
As a result, in the fitted state between the first and second fitting portions, the bubbles of the foam sealing member are crushed by compression, and the foam sealing member can be brought into a solid state with high hardness. As a result, the foamed seal member can be surely exhibited the sealing property (watertightness).

The spiral tube according to the present invention is a spiral tube composed of a band-shaped member that is spirally wound and a pair of adjacent edges are joined to each other.
The strip-shaped member
A first fitting portion formed along one of the pair of edges,
A second fitting portion formed along the other of the pair of edges,
A foam seal member made of a foam material provided between the first and second fitting portions is provided.
One of the first fitting portion and the second fitting portion is formed with a fitting groove into which the fitting ridges formed on the other are fitted.
The foam seal member is packed in the fitting groove and compressed by the fitting ridge so that it fits in the gap between the inner surface of the fitting groove and the fitting ridge, and is sealed by the compression. It is characterized in that sex is expressed.

According to the present invention, it is possible to prevent foreign matter such as sand from entering the fitting groove when the spiral tube band member is not fitted, and to prevent fitting failure. Further, it is possible to secure water stoppage after fitting.

FIG. 1 is a cross-sectional view of a strip-shaped member for a rehabilitation tube (spiral tube) including a foam seal member according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the foam seal member in a non-compressed state without load. FIG. 3 is a cross-sectional view of the rehabilitation tube along lines III-III of FIG. FIG. 4 is an enlarged cross-sectional view showing the rehabilitation tube surrounded by the circular portion IV of FIG. FIG. 5 is a perspective view showing the rehabilitated pipe in a simplified outer peripheral structure. FIG. 6 is a cross-sectional view showing a sewer pipe (existing pipe) lined with a rehabilitation pipe. FIG. 7 is a cross-sectional view of the strip-shaped member according to the second embodiment of the present invention. FIG. 8 is a cross-sectional view of a rehabilitation tube formed by the strip-shaped member according to the second embodiment. FIG. 9 is an enlarged cross-sectional view showing the rehabilitation tube surrounded by the circular portion IX of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 6 shows the existing pipe 2 in the ground. The existing pipe 2 is composed of, for example, a sewer pipe, and a rehabilitation pipe 1 (spiral pipe) is lined on the inner peripheral surface thereof. As shown in FIG. 3, a mortar 8 is filled between the existing pipe 2 and the rehabilitation pipe 1. As a result, the existing pipe 2 has been rehabilitated.

<Strip member 10>
The rehabilitation pipe 1 is composed of a strip-shaped member 10.
The material of the strip-shaped member 10 is a synthetic resin such as vinyl chloride, polyethylene, or polypropylene. A steel reinforcing strip (not shown) may be added to the strip member 10.

FIG. 1 shows a strip-shaped member 10 before being made into the rehabilitation pipe 1.
The band-shaped member 10 includes a flat band portion 11, a rib 12, and fitting portions 13 and 14. The flat band portion 11 has a flat plate shape, and extends in a long shape in a direction orthogonal to the width direction (horizontal direction in FIG. 1) (direction orthogonal to the paper surface in FIG. 1). The back side surface (upper surface in FIG. 1) of the flat band portion 11 is directed to the outer circumference of the rehabilitation pipe 1. The smooth front surface (lower surface in FIG. 1) of the flat band portion 11 is directed to the inner circumference of the rehabilitation tube 1.

A rib 12 having a T-shaped cross section is provided at the center of the strip-shaped member 10 in the width direction. The rib 12 projects from the back side surface of the flat band portion 11 and extends in the same direction as the flat band portion 11 (direction orthogonal to the paper surface in FIG. 1).
The number of ribs 12 is not limited to one, and two or more ribs may be provided (see FIG. 7).

The first fitting portion 13 is formed along the edge portion of one of the pair of edge portions on both sides in the width direction (left and right in FIG. 1) of the strip-shaped member 10 (left side in the figure). A second fitting portion 14 is formed along the other (right side in the figure) edge portion. The fitting portions 13 and 14 extend in the same direction as the flat band portion 11 (direction orthogonal to the paper surface in FIG. 1).

The first fitting portion 13 is formed in a substantially inverted U-shaped cross section, and is cantilevered from the flat band portion 11 to the back side (upper side in FIG. 1) and the outer side in the width direction (left side in FIG. 1). There is. The wall of the first fitting portion 13 outside the flat band portion 11 in the width direction (left side in FIG. 1) is the first fitting ridge 13a. A first fitting groove 13b is formed between the connecting wall 13c connected to the flat band portion 11 in the first fitting portion 13 and the fitting ridge 13a. The fitting groove 13b is opened to the front side (lower side in FIG. 1).

A locking claw 13f is formed near the front end of the fitting ridge 13a. The locking claw 13f projects toward the connecting wall 13c. A narrow portion 13d is formed between the locking claw 13f and the connecting wall 13c. The narrow portion 13d is arranged near the opening 13e in the fitting groove 13b. The groove width of the narrowed portion 13d in the fitting groove 13b is narrower than the groove width of the fitting groove portion 13bx (effective cross-sectional portion) on the back side (upper side in FIG. 1) of the narrowed portion 13d.

The second fitting portion 14 is composed of two rows of convex walls 14a and 14c facing each other in the width direction. A second fitting groove 14b is formed between the convex walls 14a and 14c. The fitting groove 14b is opened to the back side (upper side in FIG. 1).

The convex wall 14a on the outer side in the width direction (right side in FIG. 1) is the second fitting ridge 14a. A locking claw 14f is formed near the end on the back side (upper side in FIG. 1) of the fitting ridge 14a. The locking claw 14f projects toward the convex wall 14c. A narrow portion 14d is formed between the locking claw 14f and the convex wall 14c. The narrow portion 14d is arranged near the opening 14e in the fitting groove 14b. The groove width of the narrowed portion 14d in the fitting groove 14b is narrower than the groove width of the fitting groove portion 14bx (effective cross-sectional portion) on the back side (lower side in FIG. 1) of the narrowed portion 14d.

As shown in FIG. 1, foam seal members 20 are provided on the fitting portions 13 and 14 at both ends of the strip-shaped member 10 in the width direction, respectively. Each foam seal member 20 extends in a long string shape along the extending direction of the fitting grooves 13b and 14b (direction orthogonal to the paper surface in FIG. 1). As shown in FIG. 2, the cross-sectional shape of the foam seal member 20 in the no-load state (state in which it is not compressed at all) is circular. Moreover, the cross-sectional area of the foam seal member 20 in the no-load state is larger than the cross-sectional area of each fitting groove portion 13bx, 14bx.

As shown in FIG. 2, the foam seal member 20 includes a foam core portion 21 and a skin layer 22. The foam core portion 21 occupies most of the foam seal member 20. The foam core portion 21 is a closed-cell foam. The foaming ratio of the foam core portion 21 is preferably 1.2 times to 5 times.

The skin layer 22 is provided on the outer surface of the foam core portion 21. The entire foam core portion 21 is surrounded by the skin layer 22. The epidermis layer 22 is formed in the form of a non-bubble thin film. The inner peripheral surface of the skin layer 22 is integrally continuous with the foam core portion 21.

The material of the foam seal member 20 (foam core portion 21 and skin layer 22) is, for example, ethylene, propylene, diene rubber (EPDM) or the like. Preferably, the foam seal member is made of crosslinked elastic rubber or elastomer. Preferably, the foam seal member 20 is made of EPDM or the like, which causes almost no permanent residual strain.
Preferably, the hardness of the foam seal member 20 in the no-load state (uncompressed) is 10 to 70. Here, the hardness means the hardness measured based on JIS K 6253 (hereinafter, the same applies).

Hereinafter, when the foam seal member 20 is distinguished for each of the fitting portions 13 and 14, the foam seal member 20 of the first fitting portion 13 is referred to as "foam seal member 20A", and the foam of the second fitting portion 14 is foamed. The seal member 20 is referred to as "foam seal member 20B" (FIG. 1).
As shown in FIG. 1, the foam seal member 20A is packed in the fitting groove portion 13bx of the fitting groove 13b. The cross-sectional shape of the foam seal member 20A is deformed to match the cross-sectional shape of the fitting groove portion 13bx. The foam seal member 20A is highly elastic and can easily change its shape. The foam seal member 20A closes the narrow portion 13d from the back side (fitting groove portion 13bx side). By locking the locking claw 13f to the foam seal member 20A, the foam seal member 20A is prevented from coming off from the fitting groove portion 13bx. A part of the foam seal member 20A is raised toward the opening side (lower side in FIG. 1) of the narrow portion 13d of the fitting groove 13b.
The foam seal member 20A may be adhered to the inner surface of the fitting groove portion 13bx with an adhesive.

The foam seal member 20B is packed in the fitting groove portion 14bx of the fitting groove 14b. The cross-sectional shape of the foam seal member 20B is deformed to match the cross-sectional shape of the fitting groove portion 14bx. The foam seal member 20B is highly elastic and can easily change its shape. The foam seal member 20B closes the narrow portion 14d from the back side (fitting groove portion 14bx side). By locking the locking claw 14f to the foam seal member 20B, the foam seal member 20B is prevented from coming off from the fitting groove portion 14bx. A part of the foam seal member 20B is raised toward the opening side (upper side in FIG. 1) of the narrow portion 14d of the fitting groove 14b.
The foam seal member 20B may be adhered to the inner surface of the fitting groove portion 14bx with an adhesive.

<Rehabilitation tube 1>
As shown in FIG. 5, a rehabilitation pipe 1 (spiral pipe) is manufactured from the strip-shaped member 10. As shown in FIGS. 3 and 5, the band-shaped member 10 in the rehabilitation pipe 1 is spirally wound, and the fitting portions 13 and 14 of the adjacent edge portions are joined by uneven fitting. Has been done.
Specifically, as shown in FIG. 4, the fitting ridge 14a is fitted into the fitting groove 13b. The fitting ridge 14a is fitted into the fitting groove portion 13bx through the narrow portion 13d. Moreover, the fitting ridge 13a is fitted into the fitting groove 14b. The fitting ridge 13a passes through the narrow portion 14d and is fitted into the fitting groove portion 14bx.
The locking claws 13f and 14f are locked to each other, and as a result, the fitting portions 13 and 14 cannot be disengaged or are difficult to disengage.

Narrow gaps 15 and 15 are formed between the inner surface of the fitting groove portion 13bx and the fitting ridge 14a, and between the inner surface of the fitting groove portion 14bx and the fitting ridge 13a, respectively. The cross-sectional area of each gap 15 is naturally smaller than the cross-sectional area of each fitting groove portion 13bx, 14bx, and sufficiently smaller than the cross-sectional area of the foam seal member 20 in the no-load state (FIG. 2). The foam seal member 20 is filled in each of these gaps 15. In short, the foam seal member 20 is sufficiently compressed until it fits in the gap 15. By the compression, the bubbles in the foam core portion 21 are crushed, and the foam seal member 20 is in a solid state with high hardness.

Preferably, the cross-sectional area S2 of the foam seal member 20 in the gap 15 in the compressed state is 10% to 80% of the cross-sectional area S1 in the uncompressed state (no load state). That is, it is preferable that the foam seal member 20 is compressed to 20% to 90% by fitting the fitting portions 13 and 14 to each other.
Further, it is preferable that the ratio (S1 / S2) of the uncompressed cross-sectional area S1 of the foam seal member 20 to the compressed cross-sectional area S2 is about 0.5 to 5 times the foaming magnification of the foam seal member 20.

According to the band-shaped member 10 for a rehabilitation pipe of the present invention, by filling the fitting grooves 13b and 14b with the foam seal member 20, the fitting groove 13b, which has not been fitted, is used when the existing pipe 2 is rehabilitated. It is possible to prevent foreign matter such as sand in the flowing fluid from entering the 14b. In particular, the foam seal member 20 closes the narrow portions 13d and 14d from the back side (fitting groove portions 13bx and 14bx sides) to reliably prevent foreign matter such as sand from entering the fitting groove portions 13bx and 14bx. it can. Although foreign matter may enter the openings 13e and 14e from the narrow portions 13d and 14d, the foreign matter is easily discharged by the flowing fluid and the like because the openings 13e and 14e are widened, and it is difficult for the foreign matter to stay. ..
Therefore, it is possible to prevent the fitting portions 13 and 14 from being hindered from being fitted to each other, and the rehabilitation pipe 1 can be smoothly manufactured.

That is, the strip-shaped member 10 is introduced into the existing pipe 2 from the manhole 4 (FIG. 6), and while spirally winding along the inner circumference of the existing pipe 2, the fitting portions 13 and 14 adjacent to each other by one circumference are different. The fitting ridges 13a and 14a in the above are fitted into the fitting grooves 13b and 14b. Since the foam seal member 20 prevents foreign matter from entering the fitting grooves 13b and 14b, the fitting ridges 13a and 14a can be smoothly fitted into the fitting grooves 13b and 14b. Moreover, the foam sealing member 20 is easily and sufficiently compressed as the fitting ridges 13a and 14a are fitted. As a result, the prevention of foreign matter intrusion when not fitted and the compression deformation of the foam seal member 20 when mated are combined, and the fitting ridges 13a and 14a are deeply and securely fitted into the fitting grooves 13b and 14b. be able to. As a result, poor fitting can be reliably prevented.

Further, in the gap 15 between the fitting portions 13 and 14, the foam sealing member 20 is strongly compressed into a high hardness solid state (state in which air bubbles are crushed), and the inner surfaces of the fitting grooves 13b and 14b and It is brought into close contact with the outer surfaces of the fitting ridges 13a and 14a. As a result, the foam seal member 20 exhibits a sealing property, and the space between the first fitting portion 13 and the second fitting portion 14 can be watertightly sealed. That is, it is possible to prevent a fluid such as water from passing between the inner surfaces of the fitting grooves 13b and 14b and the outer surfaces of the fitting protrusions 13a and 14a and the foam sealing member 20. Moreover, it is possible to prevent a fluid such as water from passing through the foam seal member 20.
By forming the outer surface of the foam seal member 20 with the non-foam skin layer 21, the water stopping property of the foam seal member 20 can be further enhanced.

Next, other embodiments of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings for configurations that overlap with the above-described embodiments, and the description thereof will be omitted as appropriate.
7 to 9 show the second embodiment of the present invention. As shown in FIG. 7, in the second embodiment, each of the fitting portions 13 and 14 of the strip-shaped member 10 has only one of the fitting ridges 13a and 14a and the fitting grooves 13b and 14b. doing. Specifically, the first fitting portion 13 on one side (left side in FIG. 7) of the strip-shaped member 10 in the width direction has only the fitting groove 13b. On the other hand (on the right side in FIG. 7), the second fitting portion 14 has only the fitting ridge 14a.

The foam seal member 20 is provided only on the first fitting portion 13. The foam seal member 20 is housed in the fitting groove 13b. When the fitting portions 13 and 14 are not fitted together, the foam seal member 20 is packed in the fitting groove portion 13bx of the fitting groove 13b, and the narrow portion 13d is placed from the back side (fitting groove portion 13bx side). The point that it is closed is the same as that of the first embodiment.

As shown in FIG. 8, when the rehabilitation pipe 1 is manufactured, the fitting ridge 14a of the second fitting portion 14 is fitted into the fitting groove 13b of the first fitting portion 13. As shown in FIG. 9, by fitting, the foam seal member 20 is compressed until it becomes a solid state with high hardness, and fills the gap 15 between the inner peripheral surface of the fitting groove 13b and the fitting ridge 14a. .. As a result, water can be reliably stopped between the first fitting portion 13 and the second fitting portion 14.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the existing pipe is not limited to the sewer pipe 2, and may be a water pipe, an agricultural water pipe, or the like.
The foamed structure of the foam seal member 20 (foam core portion 21) is not limited to closed cells, but may be open cells.
The cross-sectional shape of the strip-shaped member 10 is not limited to that of the first and second embodiments, and can be appropriately modified.
The fitting portion 13 may have a plurality of fitting grooves 13b. The foam seal member 20 may be housed in at least a part of the plurality of fitting grooves 13b. The fitting portion 14 may have a plurality of fitting grooves 14b. The foam seal member 20 may be housed in at least a part of the plurality of fitting grooves 14b.
The spiral pipe according to the present invention is not limited to the rehabilitated pipe lined with the existing pipe, and is preferably applicable to various spiral pipes requiring watertightness.

The present invention can be applied to a spiral pipe for rehabilitation of an old existing pipe such as a sewer pipe.

1 Rehabilitation tube (spiral tube)
2 Sewer pipe (existing pipe)
10 Band-shaped member 13 First fitting portion 13a First fitting ridge (fitting ridge)
13b First fitting groove (fitting groove)
13d Narrow portion 13e Opening 13f Locking claw 13bx Fitting groove portion 14 Second fitting portion 14a Second fitting ridge (fitting ridge)
14b Second fitting groove (fitting groove)
14d Narrow part 14e Opening 14f Locking claw 14bx Fitting groove part 15 Gap 20, 20A, 20B Foam seal member 21 Foam core part 22 Skin layer

Claims (6)

It is a band-shaped member for a spiral tube that should be a spiral tube by being wound in a spiral shape and joining a pair of adjacent edges that are adjacent to each other in a spiral shape.
A first fitting portion formed along one of the pair of edges,
A second fitting portion formed along the other of the pair of edge portions and capable of concave-convex fitting with the first fitting portion,
A foam seal member made of a foam material packed in a fitting groove formed in one of the first fitting portion and the second fitting portion, and
The foam seal member is formed on the inner surface of the fitting groove by fitting the fitting ridge formed on the other side of the first fitting portion and the second fitting portion into the fitting groove. A strip-shaped member for a spiral tube, characterized in that it can be compressed until it fits within the gap between the fitting ridge and the fitting ridge, and the sealing property can be exhibited by the compression. The band-shaped member for a spiral tube according to claim 1, wherein the foam seal member includes a foam core portion having closed cells or open cells and a non-foamed epidermis layer surrounding the foam core portion. The vicinity of the opening of the fitting groove is a narrow portion narrower than the fitting groove portion on the inner side of the fitting groove.
The band-shaped member for a spiral tube according to claim 1 or 2, wherein the foam seal member closes the narrow portion from the back side before the fitting. The band-shaped member for a spiral tube according to any one of claims 1 to 3, wherein the cross-sectional area of the foam seal member becomes 10% to 80% of that in the non-compressed state due to the compression. The ratio (S1 / S2) of the uncompressed cross-sectional area S1 of the foam seal member to the compressed cross-sectional area S2 is 0.5 to 5 times the foaming magnification of the foam seal member. The strip-shaped member for a spiral tube according to any one of claims 1 to 4. It is a spiral tube composed of a band-shaped member that is spirally wound and a pair of adjacent edges that are adjacent to each other are joined to each other.
The strip-shaped member
A first fitting portion formed along one of the pair of edges,
A second fitting portion formed along the other of the pair of edges,
A foam seal member made of a foam material provided between the first and second fitting portions is provided.
One of the first fitting portion and the second fitting portion is formed with a fitting groove into which the fitting ridges formed on the other are fitted.
The foam seal member is packed in the fitting groove and compressed by the fitting ridge so that it fits in the gap between the inner surface of the fitting groove and the fitting ridge, and is sealed by the compression. A spiral tube characterized in that sex is expressed.

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