Rehabilitation pipe and belt-shaped member for rehabilitation pipe

Abstract

To provide a band-like member for rehabilitated pipes whereby: when an earthquake load or the like causes a concentrated deformation at a predetermined site of an existing pipe, a flexible part around the concentratedly deformed site is prevented from breaking, a rehabilitated pipe comprising the band-like member.SOLUTION: A band-like member 10 for existing pipe rehabilitation is spirally wound along the inner periphery of the existing pipe 2, forming a spiral rehabilitated pipe 3. The band-like member 10 for existing pipe rehabilitation includes: a flexible side band 10a including a first fitting part 13 and a flexible part 15; a regulation side band 10b including a second fitting part 14 and a straddling part 20. In the spirally wound state, the second fitting part 14 is fitted to the first fitting part 13, and the straddling part 20 strides the flexible part 15 to regulate the elongation of the flexible part 15.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a rehabilitating pipe that is lined on the inner circumference of an existing pipe and a band-shaped member that constitutes the rehabilitating pipe, and more particularly to a helical rehabilitating pipe and a band-shaped member having an expandable portion such as a bellows. [Background technology]

[0002] A method for rehabilitating an existing pipe, such as an aged sewer pipe, by constructing a helical rehabilitation pipe by spirally winding a belt-shaped member along the inner circumference of the existing pipe is known (see Patent Documents 1 and 2, etc.). For example, the belt-shaped member in Patent Document 1 is provided with bellows that are expandable in the belt width direction. When a large load is applied during an earthquake, the bellows expands and contracts, allowing the load to be released.

[0003] Existing pipes buried underground, such as sewer pipes, generally have a structure in which pipes of a certain length, such as Hume pipes, are lined up in a row. One end of each pipe has a socket, and the other end has an outlet. Adjacent pipes are connected by inserting the socket of one pipe into the socket of the other pipe. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-065351 A [Patent Document 2] JP 2019-181789 A Summary of the Invention [Problem to be solved by the invention]

[0005] In an existing pipe to be rehabilitated that is lined with a rehabilitating pipe made of a band-shaped member with an expandable portion such as a bellows, displacement during an earthquake may be concentrated at a specific location. In such a case, only the expandable portion of the expandable portion in the vicinity of the displacement concentration location is significantly expanded and deformed. For example, in a structure in which an existing pipe has pipe bodies lined up in a row, displacement during an earthquake is concentrated at the connection portion between adjacent pipe bodies, and only the expandable portion in the vicinity of the connection portion is locally expanded. If the displacement becomes excessive and exceeds the allowable amount of expansion, the expandable portion may break. In consideration of the above circumstances, the present invention aims to provide a band-shaped member for pipe rehabilitation that can prevent breakage of the expandable portion near the concentrated displacement point of the rehabilitated pipe, even if a specific point of the existing pipe is displaced in a concentrated manner due to earthquake loads or the like. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a spiral-shaped rehabilitation pipe made of a belt-shaped member for rehabilitation that is wound in a spiral shape around the inner circumference of an existing pipe, The belt-shaped member for rehabilitation pipe is A stretchable side belt portion including a first fitting portion and a stretchable portion that is stretchable in a belt width direction; A restricting side belt portion including a second fitting portion and a straddling portion; The second fitting portion is fitted into the first fitting portion, and the straddling portion straddles the stretchable portion to restrict extension of the stretchable portion. The present invention also provides a belt-shaped member for a rehabilitating pipe, which is wound in a spiral shape around the inner circumference of an existing pipe to form a rehabilitating pipe having a spiral shape, A stretchable side belt portion including a first fitting portion and a stretchable portion that is stretchable in a belt width direction; A restricting side belt portion including a second fitting portion and a straddling portion; In the spirally wound state, the second fitting portion is fitted into the first fitting portion, and the straddling portion straddles the stretchable portion to regulate the extension of the stretchable portion.

[0007] The existing pipe is rehabilitated by lining the inner periphery of the deteriorated existing pipe with the spiral rehabilitation pipe made of the band-shaped member. When a specific location of the existing pipe is displaced in a concentrated manner due to an earthquake or the like, the expansion and contraction section of the rehabilitating pipe, particularly the expansion and contraction section near the displacement concentration point, undergoes large local expansion and contraction deformation. When the expansion and contraction section extends and deforms until it hits both sides of the straddling section, further expansion and deformation is prevented. This distributes the load to the periphery, and the expansion and contraction section extends and deforms over a wide range of the rehabilitating pipe. This allows the load to be absorbed over a wide range of the rehabilitating pipe, and prevents the expansion and contraction section near the displacement concentration point from breaking.

[0008] The elastic side band portion includes an elastic side band plate portion, and the elastic portion bulges out from the elastic side band plate portion to one side in the band thickness direction, It is preferable that the regulating side band portion includes a regulating side band plate portion that is shifted to one side in the band thickness direction relative to the stretchable side band plate portion, and a pair of protrusions that protrude from the regulating side band plate portion to the other side in the band thickness direction and are spaced apart from each other in the band width direction, and that the spanning portion is formed by the pair of protrusions and the regulating side band plate portion between these protrusions. The expanding direction of the expandable portion is preferably toward the inner periphery side of the rehabilitating pipe (inward in the pipe diameter direction). The protrusions preferably protrude toward the outer periphery of the rehabilitating pipe (outside in the pipe radial direction). In the rehabilitating pipe made of the band-shaped member, the restricting band portion overlaps the expandable band portion and covers the expandable portion, thereby ensuring the smoothness of the peripheral surface of the rehabilitating pipe even at the location where the expandable portion is disposed. Furthermore, in the rehabilitation pipe, the expansion section is arranged so as to be sandwiched between a pair of protrusions. When the expansion section is expanded due to an earthquake load or the like, both sides of the expansion section abut against the pair of protrusions. This makes it possible to reliably restrict the expansion of the expansion section.

[0009] It is preferable that the belt-shaped member for rehabilitating pipe further comprises an intermediate belt portion including a rib. It is preferable that the elastic side belt portion is integrally connected to one side of the intermediate belt portion in the belt width direction, and the regulating side belt portion is integrally connected to the other side of the intermediate belt portion in the belt width direction. The elastic side belt portion and the regulating side belt portion are integrally connected via the intermediate belt portion to form one belt-shaped member. The stretchable side belt portion and the restricting side belt portion may be separate from each other.

[0010] In the belt-shaped member having an integral structure, it is preferable that the stretchable portion is disposed between the first fitting portion and the intermediate belt portion, and the straddling portion is disposed on the opposite side of the intermediate belt portion in the belt width direction from the second fitting portion. It is preferable that the straddling portion is disposed on the outer side of the belt-shaped member in the belt width direction from the second fitting portion. This ensures that the expansion and contraction deformation of the expansion section can be tolerated.

[0011] It is preferable that the intermediate band portion includes an intermediate band plate portion that is flush with the regulating side band plate portion, and the rib protrudes from the intermediate band plate portion to the other side in the band thickness direction. The protruding direction of the rib is preferably toward the outer periphery side (outer side in the pipe diameter direction) of the rehabilitating pipe, whereby the restricting side band plate portion and the intermediate band plate portion form the inner wall of the rehabilitating pipe, and the smoothness of the inner periphery surface of the rehabilitating pipe is ensured. Effect of the Invention

[0012] According to the present invention, even if a specific location of an existing pipe is displaced in a concentrated manner due to an earthquake or the like, it is possible to prevent large localized expansion and contraction deformation of only the expansion portion of the rehabilitated pipe near the displacement concentration point, thereby preventing breakage of the expansion portion. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a side cross-sectional view of a pipe rehabilitation structure including a belt-shaped member for pipe rehabilitation and a rehabilitation pipe according to a first embodiment of the present invention. [Diagram 2]Fig. 2(a) is a cross-sectional view showing the belt-shaped member in a state where the bellows is not stretched or deformed, and Fig. 2(b) is a cross-sectional view showing the belt-shaped member in a state where the bellows is stretched and deformed. [Diagram 3] FIG. 3 is an enlarged cross-sectional view of the circle III in FIG. [Figure 4] FIG. 4 is a cross-sectional view of a pipe rehabilitation structure in a state where it has been displaced due to an earthquake load or the like. [Diagram 5] FIG. 5 is an enlarged cross-sectional view showing a displacement concentration location in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First Embodiment Fig. 1 shows a pipe rehabilitation structure 1. The pipe rehabilitation structure 1 includes an existing pipe 2, a rehabilitation pipe 3, and a backfill material 4. The existing pipe 2 is, for example, a sewer pipe buried underground. Note that the existing pipe 2 is not limited to a sewer pipe, but may also be a water supply pipe, an agricultural irrigation pipe, a hydroelectric power generation water pipe, a gas pipe, a tunnel, etc.

[0015] As shown in FIG. 1, the existing pipe 2 is formed by lining up a number of pipe bodies 2a. For example, a Hume pipe of a certain length is used as the pipe body 2a. A socket 2b is provided at one end of each pipe body 2a, and an outlet 2d is provided at the other end. Adjacent pipe bodies 2a are connected to each other by inserting the socket 2b of one pipe body 2a into the socket 2d of the other pipe body 2a. The sockets 2b and the outlets 2d that are fitted together form a connection part 2c. The connection part 2c is a part of the existing pipe 1 where concentrated displacement is likely to occur due to loads during an earthquake, etc. (displacement concentrated part).

[0016] As shown in Figure 1, a rehabilitation pipe 3 is lined on the inner peripheral surface of an aged existing pipe 2. A backfilling material 4 such as mortar is filled into the gap 1c between the existing pipe 2 and the rehabilitation pipe 3. This creates a pipe rehabilitation structure 1 consisting of a composite pipe in which the existing pipe 2 and the rehabilitation pipe 3 are structurally integrated via the backfilling material 4. The bottom of the rehabilitation pipe 3 rests on the bottom of the existing pipe 2, and the rehabilitation pipe 3 is eccentric downward relative to the existing pipe 2.

[0017] Spacers may be provided in the circumferential and axial directions of the inter-pipe gap 1c, particularly at the bottom of the inter-pipe gap 1c, to raise the bottom of the rehabilitating pipe 3 above the bottom of the existing pipe 2, so that the rehabilitating pipe 3 is positioned concentrically with the existing pipe 2. The spacer may be rod-shaped or plate-shaped and may be made of metal or resin.

[0018] As shown in Fig. 1, the rehabilitation pipe 3 is composed of a belt-shaped member 10 for rehabilitation of a pipe. The belt-shaped member 10 is wound in a spiral shape around the inner circumference of the existing pipe 2. The rehabilitation pipe 3 is a helical pipe formed by winding the belt-shaped member 10 in a spiral shape.

[0019] As shown in Fig. 2(a), the belt-shaped member 10 is formed to have a constant irregular cross section and extends in the belt length direction (the direction perpendicular to the paper surface in Fig. 2(a)). The material of the belt-shaped member 10 is a synthetic resin such as polyvinyl chloride. The belt-shaped member 10 has an elastic side belt portion 10a, a restrictive side belt portion 10b, and an intermediate belt portion 10c. The elastic side belt portion 10a is integrally connected to one side of the intermediate belt portion 10c in the belt width direction (left in FIG. 2(a)), and the restrictive side belt portion 10b is integrally connected to the other side of the intermediate belt portion 10c in the belt width direction (right in FIG. 2(a)). The elastic side belt portion 10a and the restrictive side belt portion 10b are integrally connected via the intermediate belt portion 10c to form one belt-shaped member 10.

[0020] The elastic side band portion 10a includes an elastic side band plate portion 11a, a first fitting portion 13, and a bellows 15. The elastic side band plate portion 11a is formed in a flat band shape. One end portion (the left end portion in FIG. 2(a)) in the band width direction of the elastic side band plate portion 11a is provided with the first fitting portion 13 having an uneven cross-sectional shape.

[0021] A bellows 15 is disposed in the middle of the elastic side band plate portion 11a in the band width direction, i.e., between the first fitting portion 13 and the middle band portion 10c. The bellows 15 is formed in a U-shaped cross section and bulges out from the elastic side band plate portion 11a to one side in the band thickness direction (the inner circumferential side of the rehabilitating pipe 3, the lower side in Fig. 2(a)). As shown in Fig. 2(a) and Fig. 2(b), the bellows 15 is expandable in the band width direction (left and right in Fig. 2).

[0022] The intermediate band portion 10c includes an intermediate band plate portion 11c and a rib 16. The intermediate band plate portion 11c is formed in a flat band shape and is shifted to one side in the band thickness direction (the inner circumferential side of the rehabilitating pipe 3, the lower side in FIG. 2(a)) relative to the expandable side band plate portion 11a. A step 12 is formed between the intermediate band plate portion 11c and the expandable side band plate portion 11a.

[0023] A plurality of ribs 16 are formed on the intermediate band plate portion 11c. The ribs 16 protrude from the intermediate band plate portion 11c to the other side in the band thickness direction (the outer circumferential side of the rehabilitating pipe 3, the upper side in FIG. 2(a)). The plurality of ribs 16 are arranged at intervals in the band width direction. The rib 16 on the stretchable side band portion 10a side (the left end in FIG. 2(a)) is integrated with the step 12.

[0024] The restricting side band portion 10b includes a restricting side band plate portion 11b, a second fitting portion 14, and a straddling portion 20. The restricting side band plate portion 11b is formed in a flat band shape and is continuous with the intermediate band plate portion 11c in a flush state. Therefore, the restricting side band plate portion 11b is shifted toward one side in the band thickness direction (the inner peripheral side of the rehabilitating pipe 3, the lower side in FIG. 2(a)) relative to the expanding side band plate portion 11a.

[0025] The second fitting portion 14 is disposed on a side portion of the regulating side band portion 10b that is continuous with the intermediate band portion 10c. The second fitting portion 14 is formed with a concave-convex cross-sectional shape that is complementary to the first fitting portion 13. The convex stripe on the intermediate band portion 10c side of the second fitting portion 14 is integrated with one of the ribs 16.

[0026] The regulating side band portion 10b extends further toward the other side in the band width direction (to the right in Figure 2(a)) than the second fitting portion 14. A spanning portion 20 is disposed in this extending portion. The spanning portion 20 is therefore disposed on the opposite side in the band width direction to the intermediate band portion 10c than the second fitting portion 14. The spanning portion 20 includes a pair of protrusions 22. The protrusions 22 each protrude from the regulating side band plate portion 11b toward the other side in the band thickness direction (the outer circumferential side of the rehabilitation pipe 3, the upper side in Figure 2(a)). The pair of protrusions 22 are spaced apart from each other in the band width direction.

[0027] The pair of protrusions 22 and the straddling plate portion 21 between the protrusions 22 in the restricting side strip plate portion 11b constitute the straddling portion 20. The straddling portion 20 is disposed on the outer side in the strip width direction from the second fitting portion 14 in the strip-shaped member 10. The straddling plate portion 21 and the pair of protrusions 22 form a straddling recess 23 in the straddling portion 20. The straddling recess 23 is open to the other side in the strip thickness direction (the outer circumferential side of the rehabilitation pipe 3, the upper side in FIG. 2(a)). Both side portions of the straddling recess 23 are defined by the protrusions 22. The separation distance between the protrusions 22, i.e., the width of the straddling plate portion 21, is greater than the width of the bellows 15 in its natural state when it is not stretched or deformed, and is equal to or less than the allowable extension width of the bellows 15 (the width immediately before it breaks when stretched).

[0028] As shown in Fig. 3, in a helical tube-shaped rehabilitation pipe 3 made of a band-shaped member 10, an expandable side band portion 10a and a restrictive side band portion 10b, which are one turn apart, of the helically wound band member 10 are overlapped in the pipe diameter direction (top to bottom in Fig. 3). The expandable side band portion 10a is disposed on the outer periphery side (top in Fig. 3), and the restrictive side band portion 10b is disposed on the inner periphery side (bottom in Fig. 3). The regulation side band plate portion 11b and the intermediate band plate portion 11c, which are continuous and flush with each other, form the inner peripheral wall of the rehabilitating pipe 3. The inner peripheral surface of the rehabilitating pipe 3 is a smooth surface without any steps.

[0029] Within the stretchable side belt portion 10a and the restricting side belt portion 10b which are overlapped with each other, the first fitting portion 13 and the second fitting portion 14 are fitted together in a concave-convex manner. Furthermore, the spanning portion 20 spans the bellows 15. The bellows 15 is inserted into the spanning recess 23. The spanning plate portion 21 covers the bellows 15 from the inner periphery side (the lower side in FIG. 3 ) of the rehabilitation pipe 3. A pair of protrusions 22 are disposed on both sides of the bellows 15. The spanning portion 20 regulates the extension of the bellows 15. As shown in FIG. 1 , the bellows 15 and the straddling portion 20 extend in a spiral shape over the entire area of ​​the rehabilitation pipe 3 with the straddling portion 20 straddling the bellows 15 .

[0030] According to the pipe rehabilitation structure 1 in which the existing pipe 2 is rehabilitated by the above-mentioned rehabilitation pipe 3, the load caused by an earthquake or the like can be released by the expansion and contraction of the bellows 15. More specifically, as shown in Fig. 4, when a load due to an earthquake or the like is applied to the existing pipe 1, adjacent pipe bodies 2a are displaced relative to each other, and the displacement tends to concentrate particularly at the connection part 2c (a specified location). Therefore, in the rehabilitating pipe 3, the spiral bellows 15, especially the bellows part 15a near the connection part 2c, undergoes large localized expansion and contraction deformation.

[0031] 5, when the bellows portion 15a is significantly stretched, both ends of the bellows portion 15a abut against a pair of protrusions 22 of the straddling portion 23 that straddles the bellows portion 15a. This prevents the bellows portion 15a from being stretched any further. This makes it possible to prevent the bellows portion 15a in the vicinity of the connecting portion 2c (displacement concentration point) from being excessively stretched and breaking.

[0032] As shown in Fig. 4, the deformation of bellows portion 15a near connection portion 2c is restrained by spanning portion 20 that spans it, so the load is dispersed and bellows 15 undergoes elongation deformation over a wide range of rehabilitating pipe 3. Preferably, the elongation deformation is propagated over multiple pitches of helical bellows 15, centered on bellows portion 15a. This allows the load to be absorbed by the portion of helical rehabilitating pipe 3 spanning multiple pitches. Even in portions away from connection portion 2c, when bellows 15 has stretched to its maximum possible stretch, further stretching can be restricted by spanning portion 20. 1, the spanning portion 20 is provided over the entire length of the bellows 15 which extends spirally along the spiral winding direction of the rehabilitating pipe 4, thereby restricting excessive stretching of any part of the bellows 15. As a result, the bellows 15 of the rehabilitating pipe 3 can be reliably prevented from breaking due to loads such as earthquakes.

[0033] 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 elastic side belt portion having an elastic portion such as a bellows and the restricting side belt portion having a straddling portion may be separate from each other. The rehabilitating pipe 3 may be a double-strand helical pipe body including an elastic side belt portion and a restricting side belt portion which are separate from each other. In the separate structure, a first fitting portion may be provided at both ends of the stretchable side band portion having the stretchable portion, and a second fitting portion may be provided at both ends of the regulating side band portion having the straddling portion. A stretchable portion may be provided near the first fitting portion at both ends of the stretchable side band portion. In the separate structure, the elastic side belt portion may form a wide strip, and the regulating side belt portion may form a narrow joiner. The regulating side belt portion may form a wide strip, and the elastic side belt portion may form a narrow joiner.

[0034] The first fitting portion may also function as the stretchable portion. The stretchable portion of the belt-shaped member does not necessarily have to be constituted by a bellows. The belt-shaped member does not necessarily have to have a bellows. The bellows 15 may bulge outward (to one side in the band thickness direction) of the rehabilitation pipe 33. The straddling plate portion 21 of the straddling portion 20 may cover the outer circumferential side of the bellows 15, and the protrusion 22 may protrude inward. In the embodiment, the first fitting portion 13 is fitted into the second fitting portion 14 from the outer circumferential side, but the first fitting portion 13 may be fitted into the second fitting portion 14 from the inner circumferential side. An elastic portion such as a bellows may be provided in the center of the belt-shaped member in the belt width direction. The elastic side belt portion and the regulating side belt portion may be directly connected to each other without an intermediate belt portion. The backfilling material 4 may be omitted. The rehabilitating pipe 3 may constitute a self-supporting pipe that alone provides the required strength. [Industrial Applicability]

[0035] The present invention can be applied, for example, to a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0036] 1 Pipe rehabilitation structure 1c Gap between pipes 2 Existing pipes 2a Body 2b socket 2c Connection (displacement concentration point) 2d plug 3 Rehabilitation pipe 4 Backfill material 10. Belt-shaped member for rehabilitation pipes 10a Elastic side belt 10b Restricted side belt 10c middle band 11a Telescopic side band plate part 11b Restriction side strip plate 11c Intermediate strip section 12 steps 13 First fitting part 14 Second fitting part 15 Bellows (expansion section) 15a Bellows part (expansion part) near the displacement concentration point 16 Ribs 20 Straddle section 21 Cross plate part 22 protrusions 23 Saddle recess

Claims

1. A spiral-shaped rehabilitation pipe made of a belt-shaped member for rehabilitation that is wound spirally around the inner circumference of an existing pipe, The belt-shaped member for rehabilitation pipe is A stretchable side belt portion including a first fitting portion and a stretchable portion that is stretchable in a belt width direction; A restricting side belt portion including a second fitting portion and a straddling portion; The second fitting portion is fitted to the first fitting portion, and the straddling portion straddles the stretchable portion to restrict the extension of the stretchable portion, The elastic side band portion includes an elastic side band plate portion, and the elastic portion bulges out from the elastic side band plate portion to one side in the band thickness direction, A rehabilitating pipe characterized in that the regulating side band portion includes a regulating side band portion that is positioned shifted to one side in the band thickness direction relative to the expandable side band portion, and a pair of protrusions that protrude from the regulating side band portion to the other side in the band thickness direction and are spaced apart from each other in the band width direction, and the spanning portion is formed by the pair of protrusions and the regulating side band portion between these protrusions.

2. A belt-shaped member for a rehabilitating pipe that is wound in a spiral shape around the inner circumference of an existing pipe to form a rehabilitating pipe in a spiral shape, A stretchable side belt portion including a first fitting portion and a stretchable portion that is stretchable in a belt width direction; A restricting side belt portion including a second fitting portion and a straddling portion; In the spirally wound state, the second fitting portion is fitted into the first fitting portion, and the straddling portion straddles the stretchable portion to restrict the extension of the stretchable portion, The elastic side band portion includes an elastic side band plate portion, and the elastic portion bulges out from the elastic side band plate portion to one side in the band thickness direction, A band-shaped member for a rehabilitation pipe, characterized in that the regulating side band portion includes a regulating side band plate portion that is shifted to one side in the band thickness direction relative to the expandable side band plate portion, and a pair of protrusions that protrude from the regulating side band plate portion to the other side in the band thickness direction and are spaced apart from each other in the band width direction, and the spanning portion is formed by the pair of protrusions and the regulating side band plate portion between these protrusions.

3. Further comprising an intermediate band portion including a rib, A belt-shaped member for rehabilitation pipes as described in claim 2, characterized in that the elastic side belt portion is integrally connected to one side of the intermediate belt portion in the belt width direction, and the regulating side belt portion is integrally connected to the other side of the intermediate belt portion in the belt width direction.

4. The stretchable portion is disposed between the first fitting portion and the intermediate band portion, 4. The belt-shaped member for rehabilitating pipes according to claim 3, wherein the straddling portion is disposed on the opposite side of the second fitting portion to the intermediate belt portion in the belt width direction.

5. A belt-shaped member for rehabilitation pipes as described in claim 3 or 4, characterized in that the intermediate belt portion includes an intermediate belt plate portion that is flush with the regulating side belt plate portion, and the rib protrudes from the intermediate belt plate portion toward the other side in the belt thickness direction.

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