JP7712937B2 - Belt-shaped components for rehabilitating existing pipes - Google Patents

Description

The present invention relates to a strip-shaped member for rehabilitating existing deteriorated pipes, and in particular to a strip-shaped member made of synthetic resin that constitutes a spiral tubular rehabilitation pipe that is lined on the inner circumference of an existing pipe.

There is a known method of rehabilitating an existing pipe, such as an aged sewer pipe, by lining the inner circumference of the existing pipe with a rehabilitation pipe. The rehabilitation pipe is made of, for example, a strip-shaped member made of synthetic resin. (See, for example, Patent Documents 1 to 3, etc.)

This type of belt-shaped member includes a flat belt section, male and female mating sections, and a reinforcing protrusion. The female mating section has a mating groove that opens to the inner circumference and is raised from one end of the width direction of the belt section to the outer circumference. The male mating section has a mating protrusion that protrudes from the other end of the width direction of the belt section to the outer circumference. Here, the inner circumference side refers to the side that faces radially inward when the tube is made into a rehabilitated pipe. The outer circumference side refers to the side that faces radially outward when the tube is made into a rehabilitated pipe.

A reinforcing protrusion is provided so as to protrude from the band plate portion at the middle of the fitting portions toward the outer periphery. In general, the reinforcing protrusion is composed of a plurality of ribs having a T-shaped cross section. The plurality of ribs are arranged at intervals in the width direction of the band-shaped member (see Patent Document 1).
The reinforcing protrusion in Patent Document 2 is formed to have a hollow rectangular or circular cross-sectional shape.The reinforcing protrusion in Patent Document 3 is formed to have an H-shaped cross-sectional shape.

These belt-shaped members are wound spirally around the inner circumference of the existing pipe, and the mating grooves and mating protrusions of adjacent male and female mating parts are mated together. This forms a helical rehabilitated pipe from the belt-shaped member. Peripheral grooves that open to the outer periphery are formed between adjacent reinforcing protrusions (ribs) on the outer periphery of the rehabilitated pipe and between the raised parts of the female mating parts. Furthermore, a pipe-to-pipe gap is formed between the existing pipe and the rehabilitated pipe. Usually, these peripheral grooves and pipe-to-pipe gaps of the rehabilitated pipe are filled with a backfilling material such as mortar, but there are also construction methods that do not use backfilling (mortarless).

JP 2000-313064 A (FIG. 1) JP 2018-155280 A (FIG. 3) Japanese Patent No. 3769367 (Fig. 1)

During pipe manufacturing, the band-shaped member undergoes cross-sectional deformation due to the curvature applied thereto. For example, in the band-shaped member of Patent Document 2, if the top plate portion of the hollow cross-sectional reinforcing protrusion is made wider in order to increase rigidity, the band-shaped member becomes more susceptible to deformation during pipe manufacturing.
In view of the above circumstances, the present invention aims to provide a band-shaped member for rehabilitating existing pipes that can not only ensure the required rigidity but also suppress cross-sectional deformation caused by imparting curvature during pipe manufacturing.

In order to solve the above problems, the present invention provides a belt-shaped member made of synthetic resin that constitutes a spiral tubular rehabilitation pipe that is lined on the inner periphery of an existing pipe,
a band plate portion constituting a pipe wall portion on an inner periphery side of the rehabilitating pipe;
a first fitting portion having a fitting groove that opens to the inner circumferential side and protruding from one end of the band plate portion in a width direction toward an outer circumferential side opposite the inner circumferential side;
a second fitting portion including a fitting protrusion that is provided from the other end of the band plate portion in the width direction to protrude toward the outer periphery and that fits into a fitting groove of an adjacent first fitting portion when the band plate portion is wound in a spiral shape;
a reinforcing protrusion protruding from the band plate portion between the first fitting portion and the second fitting portion toward the outer circumferential side;
the reinforcing protrusion includes a plurality of hollow cross-sectional portions arranged in the width direction, the hollow portions of adjacent hollow cross-sectional portions are separated by a separating portion, and each hollow cross-sectional portion has a top plate portion that constitutes a pipe wall portion on the outer circumferential side of the rehabilitating pipe.

According to the band-shaped member having the above characteristics, by dividing the reinforcing protrusion into a plurality of hollow cross-sectional portions, cross-sectional deformation of the reinforcing protrusion is suppressed even if a curvature is imparted during pipe manufacturing. In particular, the outer peripheral side of the reinforcing protrusion is subjected to a large tensile stress due to the curvature imparted during pipe manufacturing, but by dividing the outer peripheral side into a plurality of top plate portions, large deformation of the outer peripheral side is suppressed. Furthermore, by increasing the total area of the top plate portions of the plurality of hollow cross-sectional portions, the rigidity of the band-shaped member is increased, and the band-shaped member alone exhibits self-supporting strength. As a result, the rehabilitated pipe can be made into a self-supporting pipe.

It is preferable that the adjacent hollow cross-sectional portions have side plate portions facing each other, and an isolating groove that separates the adjacent hollow cross-sectional portions is formed between these side plate portions so as to open to the outer periphery. The opposing side plate portions and the isolating groove constitute the isolating portion. The top plate portions of the adjacent hollow cross-sectional portions are separated from each other by the opening of the isolating groove to the outer periphery. This makes each hollow cross-sectional portion independent. Therefore, the variation in rigidity distribution in the band-shaped member is suppressed, and the rigidity difference between the first and second fitting portions and the reinforcing protrusion is reduced. Therefore, even if the first and second fitting portions have a lower rigidity than the reinforcing protrusion, it is possible to suppress the first and second fitting portions from significantly deforming in cross section due to the curvature imparted during pipe manufacturing.

The isolating section may have a separating wall that intersects with the band section and the top plate section, and the top plate sections of the adjacent hollow cross-section sections may be integrally connected to each other at their intersections with the separating wall. A single top plate in the reinforcing protrusion is formed by the top plate sections of multiple hollow cross-section sections. This improves the rigidity of the band-shaped member and the rigidity of the rehabilitating pipe.

It is preferable that the first hollow cross-sectional portion immediately adjacent to the first fitting portion is integrally connected to the first fitting portion, and one side portion of the first fitting portion constitutes a part of the first hollow cross-sectional portion.
This makes the first hollow cross-sectional portion and the first fitting portion structurally integrated, suppressing cross-sectional deformation of the first fitting portion due to the curvature imparted during pipe making and the fitting operation, and further suppressing deformation of the second fitting portion fitted with the first fitting portion.

the first fitting portion includes a plurality of raised portions that are raised toward the outer periphery and aligned in the width direction, each of the raised portions having the fitting groove;
Of these raised portions, it is preferable that the top end portion on the outer circumferential side of the first raised portion immediately adjacent to the first hollow cross-sectional portion is integrally connected to the top plate portion of the first hollow cross-sectional portion.
This makes the first hollow cross-section portion and the first raised portion structurally integrated, and suppresses deformation of the first raised portion, such as tilting, caused by the application of curvature. As a result, the fitting grooves of each raised portion and the fitting convex portion of the second fitting portion can be stably fitted together. Even if the fitting timing of each raised portion is shifted, the deformation of the first raised portion is suppressed, so that the fitting grooves of each raised portion and the fitting convex portion of the second fitting portion can be reliably fitted together.

It is preferable that the dimension in the thickness direction connecting the top plate portion and the band plate portion in each hollow cross-sectional portion is larger than the dimension in the width direction of the hollow cross-sectional portion.
This gives each hollow cross-sectional portion a vertically long and narrow structure, thereby suppressing deformation of the top plate portion due to the curvature imparted during pipe manufacturing.

It is preferable that the hollow cross-sectional portion has a pair of side plate portions having an arc-shaped cross section, and that intermediate portions of the pair of side plate portions face each other or are attached to each other.
This makes it possible to prevent the hollow cross-sectional portion from collapsing due to the force from the outer rollers of the pipe making machine during pipe making.

It is preferable that the hollow cross-sectional portion includes a brace portion that spans the hollow portion at an angle.
This makes it possible to prevent the hollow cross-sectional portion from collapsing due to the force from the outer rollers of the pipe making machine during pipe making.

In the case of a construction method (mortarless) in which mortar or other backfilling material (filling material) is not filled between the rehabilitating pipe made of this kind of belt-shaped member and the existing pipe, the gap between the rehabilitating pipe and the existing pipe, and the peripheral groove that opens to the outer periphery of the rehabilitating pipe, remain as voids. In such cases, there is a possibility that soil will be drawn into the voids by groundwater, causing land subsidence or road collapse.
In view of these circumstances, in the band-shaped member according to the present invention, the ratio of the cross-sectional area of the outer peripheral grooves opened to the outer periphery to the apparent cross-sectional area, which is the product of the helical pitch along the pipe axis of the rehabilitation pipe made of the band-shaped member and the pipe thickness, is preferably 40% or less, more preferably 30% or less, and even more preferably 20% or less. This makes it possible to minimize the volume of the voids and suppress the intrusion flow rate of groundwater to a flow rate at which soil and sand cannot be drawn in. This reduces the risk of ground subsidence and road collapse due to the drawing in of soil and sand. When applied to a construction method that involves backfilling, the amount of backfilling material required can be suppressed, leading to cost reduction.

The belt-shaped member for rehabilitating existing pipes according to the present invention can ensure the required rigidity and suppress cross-sectional deformation when curvature is imparted.

FIG. 1 is a cross-sectional view of an existing pipe that has been rehabilitated with a rehabilitation pipe made of a strip-shaped member according to a first embodiment of the present invention. FIG. 2 is a cross-sectional perspective view showing a portion of the belt-shaped member in the longitudinal direction. FIG. 3 is an enlarged cross-sectional view of the circle III in FIG. FIG. 4 is a cross-sectional perspective view showing a portion in the longitudinal direction of a belt-shaped member according to a second embodiment of the present invention. FIG. 5 is a cross-sectional perspective view showing a portion in the longitudinal direction of a belt-shaped member according to a third embodiment of the present invention. FIG. 6 is a cross-sectional perspective view showing a portion in the longitudinal direction of a belt-shaped member according to a fourth embodiment of the present invention. FIG. 7 is a cross-sectional perspective view showing a portion in the longitudinal direction of a belt-shaped member according to a fifth embodiment of the present invention. FIG. 8 is a cross-sectional view showing a portion of a rehabilitating pipe made of a band-shaped member according to a sixth embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First Embodiment
As shown in Fig. 1, a rehabilitating pipe 9 in the form of a spiral pipe is lined on the inner circumference of an aged existing pipe 1. This rehabilitates the existing pipe 1. The existing pipe 1 is, for example, a sewer pipe buried underground. The rehabilitating pipe 9 is installed for each sewer pipe between two manholes 4.
The existing pipe 1 to be rehabilitated is not limited to a sewer pipe, but may be a water supply pipe, an agricultural water pipe, a hydroelectric power generation water pipe, a gas pipe, a tunnel, or the like.

The rehabilitated pipe 9 is a self-supporting pipe that provides the required strength by itself without relying on the strength of the existing pipe 1. There is no backfill material between the inner circumference of the existing pipe 1 and the rehabilitated pipe 9 to structurally integrate the two.

The rehabilitation pipe 9 is composed of a strip-shaped member (profile) 10 for rehabilitating an existing pipe. The strip-shaped member 10 is wound in a spiral shape around the inner circumference of the existing pipe 1 to produce the rehabilitation pipe 9 made of a spiral pipe.
The material of the belt-shaped member 10 is a synthetic resin such as polyvinyl chloride or polyolefin, etc. The belt-shaped member 10 is formed by extrusion molding of the synthetic resin.
The belt-shaped member 10 has sufficient rigidity to enable the rehabilitating pipe 9 to become a self-supporting pipe.

As shown in Figure 2, the belt-shaped member 10 includes a belt plate portion 11, a first fitting portion 13, a second fitting portion 14, and a reinforcing protrusion portion 20, and extends in the longitudinal direction. The cross section perpendicular to the longitudinal direction of the belt-shaped member 10 is formed to have a constant shape. In other words, the cross-sectional shape is the same at any position in the longitudinal direction of the belt-shaped member 10.

The band plate portion 11 is formed as a long flat plate with a substantially uniform thickness. As shown in Figure 3, the band plate portion 11 constitutes the inner wall portion 9a of the rehabilitation pipe 9.

As shown in Fig. 2, a first fitting portion 13 is provided at one end in the width direction (the left end in Fig. 2) of the band plate portion 11. The first fitting portion 13 protrudes outward in the width direction (to the left in Fig. 2) from the band plate portion 11.
The first fitting portion 13 includes two (a plurality of) raised portions 15, 16. The raised portions 15, 16 are each formed to have a generally triangular cross section, and are raised toward the outer periphery side (the side opposite to the inner periphery side, the upper side in FIG. 2 ) from the band plate portion 11. The two raised portions 15, 16 are aligned in the width direction of the band-shaped member 10 (left and right in FIG. 2 ).

The raised portion 16 is directly connected to the band plate portion 11. A fitting groove 16a is formed in the raised portion 16. The fitting groove 16a opens to the inner peripheral side of the raised portion 16 (the lower side in FIG. 2).
The raised portion 15 is disposed on the outer side in the width direction (on the left side in FIG. 2 ) of the raised portion 16. A fitting groove 15a that opens to the inner peripheral side is formed in the raised portion 15. Two (multiple) fitting grooves 15a, 16a are aligned with each other in the width direction and each extend in the longitudinal direction of the belt-shaped member 10.

A second fitting portion 14 is provided at the other end in the width direction of the band plate portion 11 (the right end in FIG. 2). The second fitting portion 14 includes two (a plurality of) fitting protrusions 14a, 14b. The fitting protrusions 14a, 14b are each formed in a cross-sectional shape that is approximately arrow-shaped, and protrude from the other end of the band plate portion 11 toward the outer periphery. The two fitting protrusions 14a, 14b are aligned in the width direction and extend in the longitudinal direction of the band-shaped member 10. The fitting protrusion 14b is disposed outward in the width direction (to the right in FIG. 2) of the fitting protrusion 14a.
The base portion of the fitting protrusion 14b is narrowed to form an easily cut portion 14c.

As shown in Figure 3, in the rehabilitation pipe 9, adjacent fitting portions 13, 14 of the spirally wound belt-shaped member 10 are fitted together. That is, when the belt-shaped member 10 is spirally wound, the fitting protrusion 14a is fitted into the adjacent fitting groove 15a, and the fitting protrusion 14b is fitted into the adjacent fitting groove 16a.

As shown in Fig. 2, the strip portion 11 between the first fitting portion 13 and the second fitting portion 14 is provided with a reinforcing protrusion 20. The reinforcing protrusion 20 protrudes from the strip portion 11 toward the outer periphery (upward in Fig. 2) and extends in the longitudinal direction of the strip-shaped member 10.

The reinforcing protrusion 20 includes three (multiple) hollow cross-sectional portions 21, 22, and 23. The three hollow cross-sectional portions 21, 22, and 23 are arranged side by side in the width direction of the belt-shaped member 10 (left and right in FIG. 2).

Each of the hollow cross-sectional portions 21, 22, and 23 has a top plate portion 25 and a side plate portion 26, and a hollow portion 29 is formed inside, so that the hollow cross-sectional portions 21, 22 are formed with a generally rectangular frame-shaped cross section. The top plate portion 25 is disposed at the top of the hollow cross-sectional portions 21, 22 in the protruding direction. The top plate portion 25 is formed in a plate shape parallel to the band plate portion 11, and faces the band plate portion 11 with the hollow portion 29 in between. The top surfaces 25a (surfaces facing the outer periphery) of the top plate portions 25 of the three hollow cross-sectional portions 21, 22, and 23 are flush with each other.
As shown in FIG. 3 , the top plate portion 25 constitutes a pipe wall portion on the outer circumferential side of the rehabilitating pipe 9 .

As shown in FIG. 2 , the side plate portion 26 has a linear cross-sectional shape and intersects the top plate portion 25 at right angles (intersects with the top plate portion 25 ), connecting the band plate portion 11 and the top plate portion 25 .
Each of the hollow cross-sectional portions 21, 22, 23 has a long and narrow cross-section. That is, the height (dimension in the thickness direction) of the hollow cross-sectional portion 21, 22, 23 connecting the top plate portion 25 and the band plate portion 11 is larger than the dimension in the width direction of the hollow cross-sectional portion 21, 22, 23.
The thickness of the top plate portion 25 and the side plate portions 26 of the reinforcing projection 20 is approximately the same as the thickness of the band plate portion 11 , i.e., the thickness of the bottom portions of the hollow cross-sectional portions 21 , 22 .

An isolating groove 31 is formed between the opposing side plate portions 26, 26 of two adjacent hollow cross-sectional portions 21, 22 and 22, 23. The two adjacent hollow cross-sectional portions are separated by the isolating groove 31. The isolating groove 31 opens toward the outer periphery (upper side in FIG. 2 ) to form an opening 31c. The top plate portions 25 of adjacent hollow cross-sectional portions are separated by the opening 31c.
The opposing side plate portions 26 , 26 and the isolating groove 31 form an isolating portion 30 that separates adjacent hollow portions 29 .
The width of the isolating groove 31 is smaller than the widthwise dimension of the hollow cross-sectional portions 21, 22, and 23. Specifically, the width of the isolating groove 31 is preferably 10 mm or less, and more preferably 6 mm or less.

Of the three hollow cross-sectional portions, the first hollow cross-sectional portion 21 closest to the first fitting portion 13 is integrally connected to the first fitting portion 13. One side portion of the first fitting portion 13 constitutes a part of the first hollow cross-sectional portion 21. In detail, a top end portion 16c on the outer circumferential side of the first raised portion 16 closest to the first hollow cross-sectional portion 21 among the raised portions is integrally connected to a top plate portion 25 of the first hollow cross-sectional portion 21. A side wall portion 16b of the first raised portion 16 facing the reinforcing protrusion 20 is provided as one side plate portion of the first hollow cross-sectional portion 21.
The top end 16c of the first raised portion 16 and the top end 15c of the adjacent raised portion 15 are spaced apart from each other.

As shown in Fig. 1, the belt-shaped member 10 is wound in a spiral shape around the inner circumference of the existing pipe 1, and adjacent fitting grooves 15a, 16a and fitting protrusions 14a, 14b are fitted together. In this way, a helical rehabilitating pipe 9 is manufactured. The manufacturing of the pipe is performed using a pipe manufacturing machine (not shown).
Then, the fitting convex portion 14b can be cut at the easy-to-cut portion 14c, and while one end of the rehabilitating pipe 9 in the axial direction is fixed, the other end of the rehabilitating pipe 9 in the axial direction can be twisted to slide the fitting portions 13, 14 against each other, thereby expanding the diameter of the rehabilitating pipe 9 (expanded pipe production).

According to the band-shaped member 10, the reinforcing protrusion 20 is divided into a plurality of hollow cross-sectional portions 21, 22, and 23. Therefore, even if a curvature is given during pipe manufacturing, the cross-sectional deformation of the reinforcing protrusion 20 can be suppressed. In particular, a large tensile stress acts on the outer peripheral side of the reinforcing protrusion 20 due to the curvature given during pipe manufacturing, but by dividing the outer peripheral side into a plurality of top plate portions 25, the cross-sectional deformation can be reliably suppressed. Furthermore, by increasing the total area of the top plate portions 25 of the plurality of hollow cross-sectional portions 21, 22, and 23, the rigidity of the band-shaped member 10 is increased, and the self-supporting strength of the band-shaped member alone is expressed. In addition, the strength of the rehabilitation pipe 9 as a self-supporting pipe can be ensured.

Furthermore, in the band-shaped member 10, adjacent hollow cross-sectional portions 21, 22, 23 are separated from each other by the isolating grooves 31, and the individual hollow cross-sectional portions 21, 22, 23 are independent of each other, which suppresses variation in rigidity distribution in the band-shaped member 10 and reduces the rigidity difference between the fitting portions 13, 14 and the reinforcing protrusion 20. Therefore, even if the fitting portions 13, 14 have a lower rigidity than the reinforcing protrusion 20, it is possible to suppress large cross-sectional deformation of these fitting portions 13, 14 due to the curvature imparted during pipe manufacturing.
Since each of the hollow cross-sectional portions 21, 22, 23 has a vertically long and narrow structure, it is possible to suppress deformation of the top plate portion 25 due to the curvature imparted during pipe manufacturing. Since the width of the isolation groove 31 is narrower than the width of the hollow cross-sectional portions 21, 22, 23, even if a load greater than expected is locally applied after pipe manufacturing, it is unlikely that the hollow cross-sectional portions 21, 22, 23 will be crushed in a compressed manner.

Furthermore, the first hollow cross-sectional portion 21 and the first raised portion 16 are structurally connected together, thereby increasing the rigidity of the first raised portion 16. This makes it possible to suppress cross-sectional deformation of the first fitting portion 13 due to the curvature imparted during pipe manufacturing and the fitting operation. In particular, it is possible to reliably suppress deformation of the first raised portion 16 so that it falls over. As a result, it is possible to stably fit the fitting portions 13 and 14 together. Even if the fitting timing of each of the raised portions 15 and 16 is shifted, the deformation of the first raised portion 16 is suppressed, so that the fitting grooves 15a and 16a of the raised portions 15 and 16 can be reliably fitted to the fitting convex portions 14a and 14b of the second fitting portion 14. Furthermore, it is possible to suppress deformation of the second fitting portion 14 fitted to the first fitting portion 13.
As a secondary effect, the top plate portion 25 and the top end portion 16c serve as installation supports for the outer rollers of the pipe making machine, thereby preventing the strip-shaped member 10 from coming off the pipe making machine, thereby enabling stable pipe making.
Furthermore, by forming the reinforcing protrusion 20 from a plurality of hollow cross-sectional portions 21, 22, and 23, the strength required for a self-supporting pipe can be efficiently achieved. Therefore, the amount of resin material required for the strip-shaped member 10 can be reduced, which contributes to cost reduction. In addition, the weight of the strip-shaped member 10 per unit length can be reduced, which improves workability.

Next, another embodiment of the present invention will be described. In the following embodiments, the same components as those in the above-described embodiment will be denoted by the same reference numerals in the drawings, and the description thereof will be omitted as appropriate.
Second embodiment (FIG. 4)
As shown in Fig. 4, in the belt-shaped member 10B according to the second embodiment of the present invention, the reinforcing protrusion 20 has one flat top plate 24, two (plural) partition walls 32, and one side plate portion 26B on the second fitting portion 14 side. The two partition walls 32 are arranged at an interval in the middle of the width direction of the reinforcing protrusion 20. Each partition wall 32 intersects with the top plate 24 and the belt plate portion 11 and is arranged parallel to the side plate portion 26B. These partition walls 32 divide the reinforcing protrusion 20 into three hollow cross-sectional portions 21B, 22B, and 23B. Adjacent hollow portions 29 are separated by the partition walls 32 (partition portions).

The top plate portions 25B of the adjacent hollow cross-sectional portions 21B, 22B, 23B are integrally connected to each other at the intersections with the partition walls 32. The top plate 24 is formed by connecting the top plate portions 25B of the three hollow cross-sectional portions 21B, 22B, 23B.
This is similar to the first embodiment (Figure 2) in that the top plate portion 25B of the first hollow cross-sectional portion 21B is integrally connected to the top end portion 16c of the first raised portion 16, and that the side wall portion 16b of the first raised portion 16 serves as a side plate portion of the first hollow cross-sectional portion 21B.

According to the second embodiment, the area of the top plate 23B is increased, thereby improving the rigidity of the belt-shaped member 10B. As a result, the rigidity of the rehabilitation pipe 9 can be improved.

Third embodiment (FIG. 5)
As shown in Fig. 5, in the belt-shaped member 10C according to the third embodiment, a brace portion 27 is provided in each of the hollow cross-sectional portions 22C and 23C other than the first hollow cross-sectional portion 21 in the belt-shaped member 10 of the first embodiment (Fig. 2). The brace portion 27 is diagonally bridged within the hollow portion 29 so as to connect a corner portion on the outer circumferential side (upper left side in Fig. 5) at one end in the width direction of the hollow portion 29 and a corner portion on the inner circumferential side (lower right side in Fig. 5) at the other end in the width direction of the hollow portion 29. The brace portion 27 divides the hollow portion 29 into two hollow portions 29a having right-angled triangular cross sections.
The first hollow cross-sectional portion 21 may also be provided with a brace portion 27 .
The inclination of the brace portion 27 may be opposite to that in Fig. 5. In other words, the brace portion 27 may be diagonally bridged within the hollow portion 29 so as to connect a corner portion on one end of the hollow portion 29 in the width direction and on the inner circumferential side (the lower left side in Fig. 5) to a corner portion on the other end of the hollow portion 29 in the width direction and on the outer circumferential side (the upper right side in Fig. 5).
The two brace sections may be crossed in an X-shape.

According to the third embodiment, the brace portion 27 increases the rigidity of the hollow cross-sectional portions 22C, 23C, and thus the rigidity of the strip-shaped member 10C is further increased. As a result, cross-sectional deformation of the strip-shaped member 10C can be more reliably suppressed. In addition, the hollow cross-sectional portions 22C, 23C can be reliably prevented from collapsing due to the force from the outer rollers of the pipe making machine during pipe making.

<Fourth embodiment (FIG. 6)>
As shown in Fig. 6, in the belt-shaped member 10D according to the fourth embodiment, the side plate portions 41 of the hollow cross-sectional portions 22D, 23D other than the first hollow cross-sectional portion 21 are each formed with an arc-shaped cross section. The intermediate portions 41c of the pair of side plate portions 41 in each hollow cross-sectional portion 22D, 23D face each other and are attached to each other to be integrated. The hollow portion 49 of the hollow cross-sectional portion 22D, 23D is divided into a hollow portion 49c on the inner periphery side (lower side in the figure) and a hollow portion 49d on the outer periphery side (upper side in the figure) with the attached intermediate portion 41c in between. The cross-sectional shapes of the hollow portions 49c, 49d are triangular with their vertices facing each other.
The intermediate portions 41c of the pair of side plate portions 41 of each of the hollow cross-sectional portions 22D, 23D may be adjacent to each other, but may not necessarily be attached to each other.
The pair of side plate portions 41 of each of the hollow cross-sectional portions 22D, 23D may have an X-shaped cross section.

Between the first hollow cross-sectional portion 21 and the intermediate hollow cross-sectional portion 22D, an isolation groove 42 having a semicircular cross-section is formed by the opposing side plate portions 26, 41. The isolation groove 42 is open to the outer periphery (upper side in FIG. 6) via an opening 42c.
The opposing side plate portions 26 and 41 and the isolating groove 42 form an isolating portion 44 .

Between adjacent intermediate cross-sectional portions 22D, 23D, an isolating groove 43 having a generally circular cross-section is formed by the respective arc-shaped side plate portions 41. The isolating groove 43 opens to the outer periphery (upward in FIG. 6) through an opening 43c. The top plate portions 25 of adjacent hollow cross-sectional portions 22D, 23D are separated from each other by the opening 43c.
The opposing side plate portions 44 , 44 and the isolation groove 43 form an isolation portion 45 .

According to the fourth embodiment, the rigidity of the hollow cross-sectional portions 22D and 23D is increased, and thus the rigidity of the strip-shaped member 10C is further increased. As a result, the cross-sectional deformation of the strip-shaped member 10D can be more reliably suppressed. In addition, the hollow cross-sectional portions 22D and 23D can be reliably prevented from collapsing due to the force from the outer rollers of the pipe making machine during pipe making.

Fifth embodiment (FIG. 7)
As shown in Fig. 7, in the belt-shaped member 10E according to the fifth embodiment, the reinforcing protrusion 20E includes two (a plurality of) hollow cross-sectional portions 21E, 22E. In other words, the reinforcing protrusion 20E is divided into two hollow cross-sectional portions 21E, 22E. The two hollow cross-sectional portions 21E, 22E are arranged side by side in the width direction (left and right in Fig. 7) of the belt-shaped member 10E.

Each hollow cross-sectional portion 21E, 22E has a horizontally elongated cross-section. That is, the height (thickness dimension) connecting the top plate portion 25 and the band plate portion 11 in each hollow cross-sectional portion 21E, 22E is smaller than the width dimension of the hollow cross-sectional portion 21E, 22E.

Between the two hollow cross-sectional portions 21E and 22E, an isolating portion 30 including an isolating groove 31 is formed. The number of the isolating portions 30 in the belt-shaped member 10E is one.
As in the first embodiment (Figure 2), the top plate portion 25 of the first hollow cross-sectional portion 21E is integrally connected to the top end portion 16c of the first raised portion 16, and the side wall portion 16b of the first raised portion 16 is provided as a side plate portion of the first hollow cross-sectional portion 21E.

According to the strip-shaped member 10E, the hollow cross-sectional portions 21E and 22E have a horizontal structure, so that the number of isolation portions 30 can be reduced and the total cross-sectional area of the isolation portions in the entire strip-shaped member can be reduced compared to a strip-shaped member of the same width having a vertically elongated hollow cross-sectional portion (e.g., FIG. 2). This allows the strip-shaped member 10E to be lighter, leading to cost reduction and improved workability.

Sixth embodiment (FIG. 8)
As shown in Fig. 8, in the sixth embodiment of the present invention, similarly to the first embodiment (Figs. 1 to 3), a strip-shaped member 10F includes a strip plate portion 11, fitting portions 13 and 14, and a reinforcing protrusion 20, and extends in the strip length direction with a constant cross-sectional shape. In a spiral rehabilitating pipe 9F made of the strip plate portion 10F, the fitting grooves 15a and 16a of the first fitting portion 13 and the fitting protrusions 14a and 14b of the second fitting portion 14 are fitted together. The flat strip plate portion 11 constitutes the inner pipe wall portion 9a of the rehabilitating pipe 9F. The top plate portion 25 of the hollow cross-sectional portions 21, 22, and 23 of the rectangular cross section of the reinforcing protrusion 20 constitutes the outer pipe wall portion of the rehabilitating pipe 9F. The top plate portion 25 is parallel to the strip plate portion 11.

On the outer periphery of the rehabilitating pipe 9F, the adjacent protruding parts 15, 16, 21, 22, 23 form peripheral grooves 31, 13c, 13d (shaded parts in FIG. 8). Specifically, the isolation grooves 31 are formed between the adjacent hollow cross-sectional parts 21, 22 and between the adjacent hollow cross-sectional parts 22, 23. Between the raised parts 15, 16 of the first fitting part 13, the inter-ridge grooves 13c are formed. Furthermore, between the adjacent raised parts 15 and the reinforcing protruding parts 20 that are one turn apart, the inter-circumferential grooves 13d are formed. These peripheral grooves 31, 13c, 13d extend spirally along the spirally wound belt-shaped member 10F, and open to the outer periphery of the rehabilitating pipe 9F, and are connected to the inter-pipe gap 1c between the existing pipe 1 and the rehabilitating pipe 9F, as shown by the two-dot chain line in FIG. 8.

The inter-pipe gap 1c and the outer peripheral grooves 31, 13c, and 13d are not filled with a backfilling material such as mortar, etc. Therefore, the inter-pipe gap 1c and the outer peripheral grooves 31, 13c, and 13d are voids 1d that are not filled with any material.
The rehabilitating pipe 9F may be in close contact with the existing pipe 1. For example, the fitting protrusion 14b may be cut by the easy-to-cut portion 14c, and while one end of the rehabilitating pipe 9F in the pipe axis direction is fixed, the other end of the rehabilitating pipe 9F in the pipe axis direction may be twisted to slide the fitting portions 13, 14 against each other to expand the diameter of the rehabilitating pipe 9F (expanded pipe manufacturing), thereby bringing the outer periphery of the rehabilitating pipe 9F into close contact with the inner periphery of the existing pipe 1. In this case, no inter-pipe gap 1c is formed, and the gap portion 1d is formed only by the outer periphery grooves 31, 13c, and 13d.

As shown by hatching in FIG. 8, the effective width of the belt-shaped member 10F is equal to the helical pitch _P9F along the pipe axis of the rehabilitating pipe 9F.
The apparent cross-sectional area S0 per pitch _P9F of the rehabilitating pipe 9F, that is, the product of the helical pitch _P9F and the pipe thickness _t9F (S0= _P9F × _t9F ) is equal to the product of the effective width and thickness of the belt-shaped member 10F.

The ratio (S1/S0) of the cross-sectional area S1 of the peripheral grooves 31, 13c, 13d (shaded area in FIG. 8) to the apparent cross-sectional area S0 is preferably 40% or less, more preferably 30% or less, and even more preferably 20% or less. This makes it possible to minimize the volume of the peripheral grooves 31, 13c, 13d and thus the volume of the voids 1d, and to suppress the intrusion flow rate of groundwater to a flow rate that cannot draw in soil and sand. This reduces the risk of land subsidence and road collapse due to the drawing in of soil and sand.

By having the top plate portion 25, which is parallel to the band plate portion 11, face the inner surface of the existing pipe, the area over which the rehabilitation pipe 9F can be in close contact with the existing pipe 1 can be increased, and the volume of the gap portion 1d can be reduced.
By providing the hollow cross-sectional portions 21, 22, and 23 in the reinforcing protrusion 20 and hollowing out the portions, the amount of raw resin required to manufacture the belt-shaped member 10F can be reduced, thereby reducing costs and weight.

In the sixth embodiment, the gap 1d may be filled with a backfilling material such as mortar. In that case, since the volume of the peripheral grooves 31, 13c, and 13d is small, the amount of backfilling material required can be reduced, leading to cost reduction.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the number of hollow cross-sectional portions is not limited to three or two, but may be four or more.
The first fitting portion 13 may have not only a fitting groove but also a fitting protrusion, and the second fitting portion 14 may have not only a fitting protrusion but also a fitting groove into which the fitting protrusion of the first fitting portion 13 fits.
For example, the brace portion 27 (FIG. 5) may be provided in the hollow cross-sectional portion of the belt-shaped member 10B, 10E, or 10F (FIGS. 4, 7, and 8).
In the embodiment, the top surface 25a of the top plate portion 25 is located at the highest position (outermost position) of the existing pipe rehabilitation band-shaped member 10, but in consideration of ease of diameter expansion after fitting, it may be located at a position (outer peripheral position) higher than the neutral axis where the moment of inertia of the existing pipe rehabilitation band-shaped member 10 is minimum, more preferably between a position ⅓ lower than the highest position by the total height (thickness) of the existing pipe rehabilitation band-shaped member 10 and the highest position. The side plate portion 26 may protrude toward the outer periphery from the top plate portion 25, or the outer peripheral end of the side plate portion 26 may be located at the highest position (outer peripheral position) of the existing pipe rehabilitation band-shaped member 10.
It is preferable that the top surface 25a be a flat surface parallel to the outer surface of the band plate portion 11, but it may also be a concave surface recessed toward the inner periphery, a convex surface protruding toward the outer periphery, or an uneven surface, and the uneven surface may be a curved surface.
The isolating groove 31 does not have to extend to the rear surface of the band plate portion 10, and preferably has a depth equal to or greater than half the height of the hollow portion 29, and more preferably has a depth equal to or greater than 3/4 of the height of the hollow portion 29.
In order to further increase the strength of the rehabilitating pipe, a reinforcing material may be provided by injecting a hardening material such as mortar or urethane into the hollow portion 29 .
In the case of mortar-less construction, the openings may be filled with foam or elastic material to prevent soil and sand from entering the openings.
The top plate portion 25 is formed integrally with the belt-shaped member 10, but in order to reduce the risk of ground subsidence or road collapse due to the dragging of soil and sand, it may be a separate part from the portion of the belt-shaped member 10 other than the top plate portion 25. In the case of a separate part, the part constituting the top plate portion and the portion other than the top plate portion may be integrated by bonding, fusion, fitting, or the like.

The present invention can be applied to the rehabilitation of existing buried pipes, such as aging sewer pipes.

1 Existing pipe 9, 9F Rehabilitation pipe 9a Pipe wall portion on inner circumference side 10 Existing pipe rehabilitation belt-shaped member 10B, 10C, 10D, 10E, 10F Existing pipe rehabilitation belt-shaped member 11 Belt plate portion 13 First fitting portion 14 Second fitting portion 14a, 14b Fitting convex portion 15 Raised portion 15a Fitting groove 15c Top end portion 16 First raised portion 16a Fitting groove 16c Top end portion 16b Side wall portion 20, 20E Reinforcement protrusion portion 21, 21B, 21E First hollow cross-sectional portion 22, 22B, 22C, 22D, 22E Hollow cross-sectional portion 23, 23B, 23C, 23D Hollow cross-sectional portion 24 Top plate 25, 25B Top plate portion (pipe wall portion on the outer circumference side of the rehabilitation pipe)
25a Top surface (surface facing the outer periphery)
26 Side plate portion 26B Side plate portion 27 Brace portion 29 Hollow portion 29a Hollow portion 30 Isolation portion 31 Isolation groove 31c Opening 32 Isolation wall (isolation portion)
41 Side plate portion 41c Middle portion 42 Semicircular isolating groove 42c Opening 43 Isolating groove 43c Opening 44 Isolating portion 45 Isolating portion 49 Hollow portion 49c, 49d Hollow portion

Claims (10)

A band-shaped member made of synthetic resin that constitutes the entire length of a spiral tubular rehabilitation pipe that is a self-supporting pipe that is lined on the inner circumference of an existing pipe and has the required strength without relying on the strength of the existing pipe,
a strip portion integral with the inner wall of the rehabilitating pipe, the strip portion being disposed in a width direction of the rehabilitating pipe;
a first fitting portion having a fitting groove that opens to the inner circumferential side and protruding from one end of the band plate portion in a width direction toward an outer circumferential side opposite the inner circumferential side;
a second fitting portion including a fitting protrusion that is provided from the other end of the band plate portion in the width direction to protrude toward the outer periphery and that fits into a fitting groove of an adjacent first fitting portion when the band plate portion is wound in a spiral shape;
a reinforcing protrusion protruding from the band plate portion between the first fitting portion and the second fitting portion toward the outer circumferential side;
the reinforcing protrusion includes a plurality of hollow cross-sectional portions arranged in the width direction, the hollow portions of adjacent hollow cross-sectional portions are separated from each other via a separating portion, each hollow cross-sectional portion has a top plate portion constituting a pipe wall portion on an outer circumferential side of the rehabilitating pipe, and the band plate portion has a constant thickness in the width direction, including a bottom portion of the hollow cross-sectional portion constituted by the band plate portion,
A band-shaped member having sufficient rigidity to become the self-supporting tube. A belt-shaped member made of synthetic resin constituting a spiral tubular rehabilitation pipe that is lined on the inner periphery of an existing pipe,
a strip portion integral with the inner wall of the rehabilitating pipe, the strip portion being disposed in a width direction of the rehabilitating pipe;
a first fitting portion having a fitting groove that opens to the inner circumferential side and protruding from one end of the band plate portion in a width direction toward an outer circumferential side opposite the inner circumferential side;
a second fitting portion including a fitting protrusion that is provided from the other end of the band plate portion in the width direction to protrude toward the outer periphery and that fits into a fitting groove of an adjacent first fitting portion when the band plate portion is wound in a spiral shape;
a reinforcing protrusion protruding from the band plate portion between the first fitting portion and the second fitting portion toward the outer circumferential side;
the reinforcing protrusion includes a plurality of hollow cross-sectional portions arranged in the width direction, the hollow portions of adjacent hollow cross-sectional portions are separated from each other via a separating portion, each hollow cross-sectional portion has a top plate portion constituting a pipe wall portion on an outer circumferential side of the rehabilitating pipe, and the band plate portion has a constant thickness in the width direction, including a bottom portion of the hollow cross-sectional portion constituted by the band plate portion,
A band-shaped member characterized in that adjacent hollow cross-sectional portions have side plate portions facing each other, an isolating groove separating the adjacent hollow cross-sectional portions is formed between these side plate portions so as to open to the outer periphery, and the width of the isolating groove, and therefore the distance between the opposing side plate portions, is smaller than the width of each hollow cross-sectional portion. A belt-shaped member made of synthetic resin constituting a spiral tubular rehabilitation pipe that is lined on the inner periphery of an existing pipe,
a band plate portion constituting a pipe wall portion on an inner periphery side of the rehabilitating pipe;
a first fitting portion having a fitting groove that opens to the inner circumferential side and protruding from one end of the band plate portion in a width direction toward an outer circumferential side opposite the inner circumferential side;
a second fitting portion including a fitting protrusion that is provided from the other end of the band plate portion in the width direction to protrude toward the outer periphery and that fits into a fitting groove of an adjacent first fitting portion when the band plate portion is wound in a spiral shape;
a reinforcing protrusion protruding from the band plate portion between the first fitting portion and the second fitting portion toward the outer circumferential side;
the reinforcing protrusion includes a plurality of hollow cross-sectional portions arranged in the width direction, the hollow portions of adjacent hollow cross-sectional portions are separated from each other by a separating portion, and each hollow cross-sectional portion has a top plate portion constituting a pipe wall portion on an outer circumferential side of the rehabilitating pipe,
the adjacent hollow cross-sectional portions have side plate portions facing each other, and an isolating groove is formed between the side plate portions so as to be open to an outer circumferential side and separate the adjacent hollow cross-sectional portions;
A band-shaped member characterized in that the hollow cross-sectional portion has a pair of side plate portions, each of which is formed with an arc-shaped cross-section, the intermediate portions of the pair of side plate portions face each other or are attached to each other, and the portions of the pair of side plate portions that are outer circumferentially closer to each other than the intermediate portions and the portions of the pair of side plate portions that are inner circumferentially closer to each other than the intermediate portions. A belt-shaped member made of synthetic resin constituting a spiral tubular rehabilitation pipe that is lined on the inner periphery of an existing pipe,
a band plate portion constituting a pipe wall portion on an inner periphery side of the rehabilitating pipe;
a first fitting portion having a fitting groove that opens to the inner circumferential side and protruding from one end of the band plate portion in a width direction toward an outer circumferential side opposite the inner circumferential side;
a second fitting portion including a fitting protrusion that is provided from the other end of the band plate portion in the width direction to protrude toward the outer periphery and that fits into a fitting groove of an adjacent first fitting portion when the band plate portion is wound in a spiral shape;
a reinforcing protrusion protruding from the band plate portion between the first fitting portion and the second fitting portion toward the outer circumferential side;
the reinforcing protrusion includes a plurality of hollow cross-sectional portions arranged in the width direction, the hollow portions of adjacent hollow cross-sectional portions are separated from each other by a separating portion, and each hollow cross-sectional portion has a top plate portion constituting a pipe wall portion on an outer circumferential side of the rehabilitating pipe,
A band-shaped member, wherein the hollow cross-sectional portion integrally includes a brace portion that is diagonally spanned across the hollow portion. The belt-shaped member according to claim 1 or 4, characterized in that the separating portion has a separating wall that intersects with the belt portion and the top plate portion, and the top plate portions of the adjacent hollow cross-section portions are connected together at the intersections with the separating wall. The belt-shaped member according to claim 1 or 5, characterized in that the hollow cross-sectional portion has a pair of side plate portions with an arc-shaped cross section, and the intermediate portions of the pair of side plate portions face each other or are attached to each other. A belt-shaped member according to any one of claims 1 to 6, characterized in that the first hollow cross-sectional portion immediately adjacent to the first fitting portion is integrally connected to the first fitting portion, and one side of the first fitting portion constitutes a part of the first hollow cross-sectional portion. the first fitting portion includes a plurality of raised portions that are raised toward the outer periphery and aligned in the width direction, each of the raised portions having the fitting groove;
The belt-shaped member according to claim 7, characterized in that the top end portion of the first raised portion closest to the first hollow cross-section portion on the outer circumferential side is integrally connected to the top plate portion of the first hollow cross-section portion. A belt-shaped member according to any one of claims 1 to 8, characterized in that the dimension in the thickness direction connecting the top plate portion and the belt plate portion in each hollow cross-sectional portion is greater than the dimension in the width direction in the hollow cross-sectional portion. A belt-shaped member according to any one of claims 1 to 9, characterized in that the cross-sectional area of the peripheral grooves that open to the outer periphery is 40% or less of the apparent cross-sectional area, which is the product of the helical pitch along the pipe axis of the rehabilitated pipe made of the belt-shaped member and the pipe thickness.