JP2022015805A - Pipeline rehabilitation method and rehabilitation pipe - Google Patents

Abstract

To provide a pipeline rehabilitation method capable of preventing deformation of a lining pipe due to external water pressure.SOLUTION: In this pipeline rehabilitation method, an existing pipe 12 and a lining pipe 14 form a rehabilitation pipe 10 integrated with a filler 16. First, an annular groove 60 extending in a circumferential direction is formed at a predetermined position on an inner peripheral surface of the existing pipe, and then a water stop member 62 is provided so as to cover the annular groove. The water stop member is a member that, when the existing pipe is deformed at a portion of the annular groove, follows the deformation and prevents water from entering the lining pipe side. After that, the lining pipe is formed along the inner peripheral surface of the existing pipe, and the filler is filled between the inner peripheral surface of the existing pipe and an outer peripheral surface of the lining pipe.SELECTED DRAWING: Figure 9

Description

The present invention relates to a pipeline rehabilitation method and a rehabilitation pipe, and more particularly to a pipeline rehabilitation method and a rehabilitation pipe in which an existing pipe and a lining pipe are integrated by a filler to form a rehabilitation pipe.

An example of a conventional pipeline rehabilitation method is disclosed in Patent Document 1. In the technique of Patent Document 1, first, an annular groove extending in the circumferential direction is formed at a predetermined position on the inner peripheral surface of the existing pipe, and then a sealing member for preventing the filler from entering the annular groove is provided. prepare. After that, an extensible lining pipe is formed along the inner peripheral surface of the existing pipe, and a filler is filled between the inner peripheral surface of the existing pipe and the outer peripheral surface of the lining pipe.

According to the technique of Patent Document 1, since the damaged portion of the existing pipe can be induced in the portion of the annular groove, it is possible to prevent the damaged portion of the existing pipe (and thus the rehabilitated pipe) from being damaged, and the rehabilitated pipe can be prevented from being damaged. Can be prevented from being damaged in an unmanaged state. That is, the seismic resistance of the rehabilitation pipe can be improved. Further, even if the existing pipe is deformed and damaged at the portion of the annular groove in the event of an earthquake or the like, the function of the rehabilitated pipe as a conduit is maintained by the lining pipe.

Patent No. 6559920

However, in the technique of Patent Document 1, when the existing pipe is damaged at the portion of the annular groove, inundation such as groundwater may reach the outer peripheral surface side of the lining pipe from the damaged portion and act as an external water pressure on the lining pipe. be. Therefore, the lining pipe may be significantly deformed by the external water pressure.

Therefore, a main object of the present invention is to provide a novel method of pipeline rehabilitation and rehabilitation tube.

Another object of the present invention is to provide a pipeline rehabilitation method and a rehabilitation pipe that can prevent the lining pipe from being significantly deformed by the external water pressure even if the existing pipe is damaged at the portion of the annular groove.

The first invention is a pipeline rehabilitation method in which an existing pipe and a lining pipe are integrated with a filler to form a rehabilitated pipe, and (a) extends in the circumferential direction at a predetermined position on the inner peripheral surface of the existing pipe. An annular groove is formed, and after (b) step (a), when the existing pipe is deformed at the portion of the annular groove, a short tubular shape that follows the deformation of the existing pipe and prevents water from entering the lining pipe side. A water blocking member is provided on the inner peripheral surface of the existing pipe so as to cover the annular groove, and after (c) step (b), a lining pipe is installed along the inner peripheral surface of the existing pipe, and (d). After step (c), it is a pipeline rehabilitation method in which a filler is filled between the inner peripheral surface of the existing pipe and the outer peripheral surface of the lining pipe.

In the first invention, the existing pipe and the lining pipe are integrated with each other by a filler to form a rehabilitation pipe. First, in step (a), an annular groove extending in the circumferential direction is formed at a predetermined position on the inner peripheral surface of the existing pipe. Next, in step (b), a short cylindrical water stop member is provided on the inner peripheral surface of the existing pipe so as to cover the annular groove. This water stop member is a member for preventing water from entering the lining pipe side by following the deformation of the existing pipe when the existing pipe is deformed at the portion of the annular groove. Subsequently, in step (c), a lining pipe is installed in the existing pipe along the inner peripheral surface of the existing pipe. Then, in step (d), a filler is filled between the inner peripheral surface of the existing pipe and the outer peripheral surface of the lining pipe to form a rehabilitated pipe in which the existing pipe and the lining pipe are integrated by the filler. do.

In the rehabilitation pipe formed in this way, in the event of an earthquake or the like, a portion where the existing pipe is damaged can be induced in the portion of the annular groove. Therefore, it is possible to prevent damage to other parts of the existing pipe (and thus the rehabilitation pipe), and it is possible to prevent damage to the rehabilitation pipe in an unmanaged state. That is, the seismic resistance of the rehabilitation pipe can be improved. Further, even if the existing pipe is deformed and damaged at the portion of the annular groove, the water blocking member follows the deformation, and the water blocking member stops the infiltration of water from the damaged portion of the existing pipe to the lining pipe side.

According to the first invention, since the water blocking member is provided so as to cover the annular groove, even if the existing pipe is damaged at the annular groove portion due to an earthquake or the like, water can reach the lining pipe from the damaged portion. Can be prevented. Therefore, it is possible to prevent the lining pipe from being significantly deformed by the external water pressure.

The second invention is dependent on the first invention, and the water blocking member is supported by pressing the short cylindrical water blocking sheet arranged facing the annular groove and the water blocking sheet from the inner peripheral surface side. Includes a presser member.

In the second invention, the water blocking member includes a water blocking sheet and a holding member. The waterproof sheet is formed in a short cylinder shape and is arranged so as to face the annular groove. Further, the holding member supports the waterproof sheet by pressing it from the inner peripheral surface side.

According to the second invention, since the holding member for pressing and supporting the waterproof sheet from the inner peripheral surface side is provided, the waterproof sheet can be appropriately brought into close contact with the inner peripheral surface of the existing pipe and the like. The water sheet can be reinforced. Therefore, the water-stopping member can appropriately exert the water-stopping function, and can more reliably prevent water from reaching the lining pipe.

The third invention is dependent on the second invention, in which the waterproof sheet has an extendable portion in the central portion in the axial direction.

According to the third invention, the waterproof sheet can appropriately follow the deformation of the existing pipe.

The fourth invention is dependent on the second or third invention, the presser member includes a first presser ring and a second presser ring, and the first presser ring and the second presser ring are side edges of each other. It is provided on the inner peripheral surface side of the waterproof sheet in a state where the two are overlapped by a predetermined width.

According to the fourth invention, the pressing member can appropriately follow the deformation of the existing pipe.

The fifth invention is dependent on any one of the first to fourth inventions, and in step (b), on both sides of the annular groove, between the inner peripheral surface of the existing pipe and the outer peripheral surface of the water blocking member. Further, a waterproof ring made of an elastic sealing material is provided.

According to the fifth invention, the watertight ring can improve the watertightness between the inner peripheral surface of the existing pipe and the outer peripheral surface of the water blocking member, and more reliably prevent water from reaching the lining pipe. can.

The sixth invention is dependent on any one of the first to fifth inventions, and in step (b), the water blocking member is fixed to the inner peripheral surface of the existing pipe by a fixing tool.

According to the sixth invention, when the existing pipe is deformed at the portion of the annular groove, the water blocking member can more reliably follow the deformation.

The seventh invention is dependent on any one of the first to sixth inventions, and in step (c), a lining tube having an extendable portion is formed.

According to the seventh invention, since the lining pipe can appropriately follow the deformation of the existing pipe, it is possible to more reliably prevent the lining pipe from being damaged.

The eighth invention is a rehabilitation pipe in which an existing pipe and a lining pipe are integrated by a filler, and is an annular groove or an annular groove formed so as to extend in the circumferential direction at a predetermined position on the inner peripheral surface of the existing pipe. It is provided on the inner peripheral surface of the existing pipe so as to cover the water, and when the existing pipe is deformed at the annular groove part, it follows the deformation of the existing pipe and prevents water from entering the lining pipe side. It is a rehabilitation pipe provided with a member, a lining pipe formed along the inner peripheral surface of the existing pipe, and a filler filled between the inner peripheral surface of the existing pipe and the outer peripheral surface of the lining pipe.

In the eighth invention, in the event of an earthquake or the like, a portion where the existing pipe is damaged can be induced in the portion of the annular groove. Therefore, it is possible to prevent damage to other parts of the existing pipe (and thus the rehabilitation pipe), and it is possible to prevent damage to the rehabilitation pipe in an unmanaged state. That is, the seismic resistance of the rehabilitation pipe can be improved. Further, even if the existing pipe is deformed and damaged at the portion of the annular groove, the water blocking member follows the deformation and prevents water from entering the lining pipe side from the damaged portion of the existing pipe.

According to the eighth invention, since the water blocking member provided so as to cover the annular groove is provided, even if the existing pipe is damaged at the annular groove portion due to an earthquake or the like, inundation reaches the lining pipe from the damaged portion. Can be prevented from doing so. Therefore, it is possible to prevent the lining pipe from being significantly deformed by the external water pressure.

According to the present invention, even if the existing pipe is damaged at the annular groove portion during an earthquake or the like, it is possible to prevent water from reaching the lining pipe from the damaged portion, and the lining pipe is greatly deformed by the external water pressure. Can be prevented.

The above-mentioned object, other object, feature and advantage of the present invention will be further clarified from the detailed description of the examples described below with reference to the drawings.

It is a schematic diagram which shows the state when the lining pipe is formed in the existing pipe in the pipeline rehabilitation method which is one Example of this invention. It is sectional drawing which shows an example of a strip member. It is sectional drawing which shows an example of the connection member. It is sectional drawing which shows the state that the side edge portions of a strip member were connected with each other by a connecting member. It is a perspective view which shows an example of a water stop member. It is sectional drawing which shows an example of a water stop member. It is a schematic diagram which shows the state when the holding member is attached to the water stop sheet. It is a schematic diagram which shows a series of steps of a pipeline rehabilitation method. It is sectional drawing which shows the rehabilitation pipe formed by the pipeline rehabilitation method. It is sectional drawing which shows typically the state of the rehabilitation pipe when the annular groove portion is broken at the time of an earthquake or the like. It is sectional drawing which shows the appearance that another example of the water-stopping member was provided in the existing pipe. It is sectional drawing which shows the state which the other example of the water-stopping member was provided in the existing pipe. It is sectional drawing which shows the state which the other example of the water-stopping member was provided in the existing pipe.

With reference to FIGS. 1 and 9, the pipeline rehabilitation method according to an embodiment of the present invention rehabilitates an existing pipe 12 buried underground, and the existing pipe 12 and the lining pipe 14 are fillers. The rehabilitation pipe (composite pipe) 10 integrated by 16 is formed.

As will be described in detail later, in this embodiment, the strip member 20 is spirally wound along the inner surface of the existing pipe 12, and the adjacent side edges of the strip member 20 are connected by the connecting member 22. As a result, the lining pipe 14 is manufactured in the existing pipe 12. Further, in this embodiment, before constructing the lining pipe 14, an annular groove 60 is formed at a predetermined position on the inner peripheral surface of the existing pipe 12, and the annular groove 60 is formed on the inner peripheral surface of the existing pipe 12 so as to cover the annular groove 60. A water stop member 62 is provided.

The pipeline rehabilitation method according to the present invention rehabilitates reinforced concrete pipes (Hume pipes), concrete pipes, ceramic pipes, synthetic resin pipes, etc., and the diameter, shape, use, etc. of the existing pipe 12 to be rehabilitated are described. Not particularly limited. In this embodiment, it is assumed that a sewer pipe having a medium and large diameter and a circular cross section having a diameter of 800 to 3000 mm is rehabilitated.

First, an example of a strip member (strip) 20 and a connecting member (joiner) 22, which are strip-shaped lining members (tube rehabilitation members) constituting the lining pipe 14, will be described. However, the specific configuration or shape of the strip member 20 and the connecting member 22 shown below is merely an example and can be changed as appropriate.

As shown in FIG. 2, the strip member 20 is a long member that is a main component of the lining pipe 14, and includes a strip-shaped substrate 30. The inner surface 30a of the substrate 30 is a surface constituting the inner surface of the lining tube 14, and is a smooth surface. Further, on the outer surface 30b side of the substrate 30, a plurality of ribs 32 that are arranged at predetermined intervals in the width direction and extend in the longitudinal direction are formed. The rib 32 includes a substantially T-shaped first rib 32a and a substantially L-shaped second rib 32b arranged at both side edges of the substrate 30, and is to be embedded in a filler (backing material) described later. Demonstrate the anchor function.

Further, on both side edges of the substrate 30, a first fitting portion 34 to be fitted with the second fitting portion 42 of the connecting member 22, which will be described later, is formed. The first fitting portion 34 is formed in a substantially U shape that opens toward the inner surface 30a side of the substrate 30, and the vertical piece 34a arranged on the outer side in the width direction has the inner side and the outer side in the width direction. Two protruding locking claws are formed.

The strip member 20 is integrally molded by, for example, extrusion molding of a synthetic resin such as hard vinyl chloride, and the rib 32 and the first fitting portion 34 are formed over the entire length of the substrate 30 in the longitudinal direction. The width of the strip member 20 is, for example, 250 mm, and the height thereof is, for example, 17.5 mm.

As shown in FIG. 3, the connecting member 22 is a long member for connecting the side edge portions of the strip member 20 to each other, and includes a strip-shaped substrate 40. The inner surface 40a of the substrate 40 constitutes the inner surface of the lining pipe 14 together with the inner surface 30a of the strip member 20. Further, a second fitting portion 42 to be fitted with the first fitting portion 34 of the strip member 20 is formed on both side edges of the substrate 40. The second fitting portion 42 includes two ridges 42a protruding from the outer surface 40b of the substrate 40 and extending in the longitudinal direction. A locking claw is formed at the tip of each ridge 42a. Further, a water blocking material 44 is provided between the two ridges 42a.

Further, an extendable portion 46 that can be extended in the width direction of the connecting member 22, that is, in the tube axis direction of the lining tube 14, is formed in the central portion of the substrate 40. The extendable portion 46 includes a U-shaped groove portion 48 protruding from the outer surface 40b and a wave-shaped flexible portion 50 connecting the outer surfaces 40b so as to cover the entire groove portion 48. Such an expandable portion 46 can be expanded and contracted according to the deformation of the groove portion 48, and by breaking (splitting) the groove portion 48 in the width direction, a large expansion according to the deformation of the flexible portion 50 is possible. ..

The substrate 40, the second fitting portion 42, and the groove portion 48 of the connecting member 22 are integrally molded by, for example, extrusion molding of a synthetic resin such as hard vinyl chloride. Further, the flexible portion 50 is formed of, for example, a polyolefin-based resin such as polyethylene, and is fixed to the substrate 40. The second fitting portion 42, the waterproof material 44, and the extendable portion 46 are formed over the entire length of the substrate 40 in the longitudinal direction. The width of the connecting member 22 is, for example, 55 mm.

As shown in FIG. 4, when the adjacent side edge portions of the spirally wound strip member 20 are connected to each other by the connecting member 22, the first fitting portion 34 of the strip member 20 and the connecting member 22 are connected. The second fitting portion 42 of the above is fitted. Then, each locking claw of the second fitting portion 42 is locked to each locking claw of the first fitting portion 34, and the connecting member 22 is prevented from coming off and fixed to the strip member 20. The side edges of the strip member 20 are connected to each other by the connecting member 22. Further, the water blocking material 44 and the tip end portion of the vertical piece 34a of the first fitting portion 34 come into contact with each other, so that the water blocking of the connecting portion is ensured. Further, by forming the lining pipe 14 using the connecting member 22 having the extensible portion 46, the lining pipe 14 having the extensible portion 46 extending in a spiral shape is formed, and the formed lining pipe 14 is a pipe shaft. It has extensibility in the direction.

Returning to FIG. 1, in the pipeline rehabilitation method of this embodiment, an annular groove 60 extending in the circumferential direction is formed at a predetermined position on the inner peripheral surface of the existing pipe 12. The annular groove 60 induces a portion where the existing pipe 12 is deformed and damaged in the event of an earthquake or the like to the portion of the annular groove 60, and is used in another portion of the existing pipe 12 (and thus the rehabilitation pipe 10). This is to prevent damage.

The size and shape of the annular groove 60 are appropriately set according to conditions such as the material and diameter of the existing pipe 12, and are not particularly limited, but the width of the annular groove 60 is preferably, for example, 5 mm to 10 mm. Further, the depth of the annular groove 60 is preferably such that the residual thickness of the existing pipe 12 is, for example, 20 mm to 30 mm, and the bottom surface of the annular groove 60 is a reinforcing bar so that there is no reinforcing bar in the remaining portion of the existing pipe 12. The depth located on the outer peripheral surface side of the reinforcing bar arrangement position is preferable. Further, as the cross-sectional shape of the annular groove 60, a rectangular shape, a triangular shape, a semicircular shape or the like can be appropriately adopted, but in this embodiment, a rectangular shape is adopted (see FIG. 8). It is preferable that the annular groove 60 is formed over the entire length of the existing pipe 12 in the circumferential direction, but it is not always necessary to form the annular groove 60 continuously over the entire length of the existing pipe 12, and the annular groove 60 is formed in the circumferential direction of the existing pipe 12. The annular groove 60 may be formed with a part left.

Further, in the pipeline rehabilitation method of this embodiment, the water blocking member 62 is provided on the inner peripheral surface of the existing pipe 12 so as to cover (straddle) the opening of the annular groove 60. When the existing pipe 12 is deformed and damaged at the portion of the annular groove 60 during an earthquake or the like, the water blocking member 62 follows the deformation of the existing pipe 12 and is located on the lining pipe 14 side from the damaged portion of the existing pipe 12. It is a member to prevent inundation of groundwater, etc. into the water. Hereinafter, the configuration of the water blocking member 62 will be described, but the specific configuration or shape of the water blocking member 62 shown below is merely an example and can be appropriately changed.

As shown in FIGS. 5 and 6, the water blocking member 62 is a member having extensibility that can follow the deformation of the existing pipe 12, and is formed in a short cylindrical shape as a whole. The axial length of the water blocking member 62 is set to, for example, 100 to 200 mm depending on the diameter of the existing pipe 12 to be rehabilitated, and is 150 mm in this embodiment. Further, the outer diameter of the water stop member 62 is set to a size slightly smaller than the inner diameter of the existing pipe 12 in consideration of the thickness of the water stop ring 84 (see FIG. 8) described later.

In this embodiment, the water blocking member 62 is composed of a water blocking sheet 70 arranged to face the annular groove 60 and a pressing member 72 provided on the inner peripheral surface side of the water blocking sheet 70.

The waterproof sheet 70 is made of synthetic rubber such as styrene butadiene rubber (SBR) and ethylene propylene diene rubber (EPDM) or synthetic resin such as soft polyvinyl chloride. It is formed by processing it into a cylindrical shape. Further, an extendable portion 70a having a substantially Z-shaped cross section folded in the axial direction is formed at the central portion in the axial direction of the waterproof sheet 70. On the other hand, both ends of the water stop sheet 70 in the axial direction are pressed against the inner peripheral surface of the existing pipe 12 via the water stop ring 84, and as a fixing portion 70b fixed by using the fixture 86 (see FIG. 8). Used. The thickness of the waterproof sheet 70 is, for example, 1.0 mm. Further, the axial length of the extendable portion 70a in the folded state (initial state) is set to, for example, 15 mm to 40 mm, and is 35 mm in this embodiment.

Such a waterproof sheet 70 can follow the deformation (opening and bending) in the annular groove 60 portion of the existing pipe 12 by deforming the extendable portion 70a so as to expand. The axial length of the extendable portion 70a is such that even if the existing pipe 12 is deformed (expected deformation at the time of an earthquake or the like) in the annular groove 60 portion, the waterproof sheet 70 is not damaged and is deformed. It is set to a size that can follow.

The pressing member 72 is a member that presses and supports the waterproof sheet 70 from the inner peripheral surface side, and is provided so as to cover the entire inner peripheral surface of the waterproof sheet 70. When the water stop member 62 includes the presser member 72, the water stop sheet 70 can be appropriately brought into close contact with the inner peripheral surface of the existing pipe 12 (the water stop ring 84 in this embodiment), and the water stop sheet 70 can be provided. Since it is reinforced, the water blocking function of the water blocking member 62 is appropriately exhibited.

In this embodiment, the presser member 72 is composed of a first presser ring 74 and a second presser ring 76. Each of the first presser ring 74 and the second presser ring 76 is formed by processing a spring steel made of carbon tool steel, stainless steel, or the like into a short cylindrical shape. The thickness of the first presser ring 74 and the second presser ring 76 is, for example, 1.0 mm, respectively. Further, the outer diameter of the second pressing ring 76 is set to be the same as the inner diameter of the first pressing ring 74. The first pressing ring 74 and the second pressing ring 76 are overlapped with each other by a predetermined width so that their side edges (one end in the axial direction) can be slidably overlapped with each other, and the inner circumference of the waterproof sheet 70 is overlapped. It is provided on the surface side. This predetermined width, that is, the axial length of the overlapping portion 78 between the first pressing ring 74 and the second pressing ring 76 is set to, for example, 30 mm to 80 mm, and is 50 mm in this embodiment. On the other hand, both ends in the axial direction of the pressing member 72, that is, portions outward in the axial direction from the overlapping portion 78, are used as pressing portions for pressing the waterproof sheet 70 against the waterproof ring 84, and the inner peripheral surface of the existing pipe 12 is used. It is used as a fixing portion to be fixed by using the fixing tool 86.

Such a pressing member 72 can follow the deformation in the portion of the annular groove 60 of the existing pipe 12 by sliding and moving the first pressing ring 74 and the second pressing ring 76 in a direction away from each other. The axial length of the overlap portion 78 is set to such a size that the overlap portion 78 remains even if the existing pipe 12 is deformed (unexpected deformation at the time of an earthquake or the like) in the portion of the annular groove 60. ing.

As shown in FIG. 7, when the waterproof sheet 70 and the presser member 72 are integrated to form the waterproof member 62, first, a part of the first presser ring 74 in the circumferential direction is bent inward. The diameter of the first presser ring 74 is reduced to a substantially heart shape, and the first presser ring 74 in this reduced diameter state is arranged at a predetermined position in the water stop sheet 70. Then, by returning the first presser ring 74 to a cylindrical shape, the inner peripheral surface of the waterproof sheet 70 and the outer peripheral surface of the first presser ring 74 are brought into close contact with each other. As a result, the waterproof sheet 70 and the first presser ring 74 are integrated. After that, similarly, the diameter of the second presser ring 76 is reduced to a substantially heart shape so that the side edges of the first presser ring 74 and the second presser ring 76 are overlapped with each other so that the second presser ring 76 is overlapped with each other. The ring 76 is placed at a predetermined position in the waterproof sheet 70. Then, by returning the second pressing ring 76 to a cylindrical shape, the inner peripheral surface of the waterproof sheet 70 and the first pressing ring 74 and the outer peripheral surface of the second pressing ring 76 are brought into close contact with each other. As a result, the water stop member 62 in which the water stop sheet 70, the first presser ring 74 and the second presser ring 76 are integrated is formed.

The work of integrating the waterproof sheet 70 and the holding member 72 may be performed on the ground (that is, before the construction of the waterproof member 62) or in the existing pipe 12 (that is, the construction of the waterproof member 62). You may go (on the way). Further, only the first presser ring 74 can be integrated with the water stop sheet 70 on the ground, and the second presser ring 76 can be integrated with the water stop sheet 70 in the existing pipe 12.

Subsequently, with reference to FIGS. 1 and 8, a pipeline rehabilitation method for rehabilitating the existing pipe 12 by forming a rehabilitation pipe 10 in which the existing pipe 12 and the lining pipe 14 are integrated with a filler 16. An example will be described.

When rehabilitating the existing pipe 12, first, necessary members such as a strip member 20, a connecting member 22, a spacer 18 and a water blocking member 62, a cutter device and a pipe making machine are placed on the ground near the rehabilitation section of the existing pipe 12. Prepare necessary equipment such as as appropriate. The strip member 20 and the connecting member 22 are individually wound into rolls and installed on the ground at the start position and the end position of the rehabilitation section. Further, the inner peripheral surface of the existing pipe 12 is appropriately washed using a high pressure washer or the like.

Next, as shown in FIG. 8A, an annular groove 60 extending in the circumferential direction is formed at a predetermined position on the inner peripheral surface of the existing pipe 12. For forming the annular groove 60, it is preferable to use a dedicated cutter device capable of cutting concrete and reinforcing bars at the same time. The position of forming the annular groove 60 in the pipe axis direction of the existing pipe 12 is not particularly limited, but it is preferably formed in the vicinity of the connecting portion 82 between the existing pipe 12 and the manhole 80. For example, it is preferable to form the annular groove 60 at a position about 500 mm away from the connection portion 82.

Further, although not shown, the annular groove 60 may be filled with a sealing member. As the sealing member, a foaming material such as polystyrene foam and a caulking material such as a silicone-based caulking material can be used. The entry of the filler 16 into the annular groove 60 is basically prevented by the water blocking member 62, but by filling the annular groove 60 with the sealing member, the inside of the annular groove 60 can be more reliably performed. It is possible to prevent the filler 16 from entering the filling material 16 and prevent the filler 16 from being integrated with the existing pipe 12 in the annular groove 60.

When the annular groove 60 is formed on the inner peripheral surface of the existing pipe 12, subsequently, as shown in FIG. 8B, a water blocking member is formed on the inner peripheral surface of the existing pipe 12 so as to cover (straddle) the annular groove 60. 62 is installed.

When installing the water stop member 62, first, water stop rings 84 formed of an elastic sealing material are provided on both sides of the annular groove 60. The water stop ring 84 is a member for ensuring watertightness between the inner peripheral surface of the existing pipe 12 and the outer peripheral surface of the water stop member 62. In this embodiment, a water stop ring 84 made of water-swelling rubber is used, and two water stop rings 84 are provided on both sides of the annular groove 60 at predetermined intervals. By forming the water stop ring 84 with water-swelling rubber, even if water infiltrates from the portion of the annular groove 60, the water stop ring 84 absorbs water and expands to stop the water from the inner peripheral surface of the existing pipe 12. The water stop ring 84 comes into close contact with the outer peripheral surface of the water member 62 more strongly, and water intrusion can be reliably stopped.

When the water stop rings 84 are provided on both sides of the annular groove 60, then the water stop member 62 is provided so as to cover the annular groove 60. For example, on the ground, a structure in which the waterproof sheet 70 and the first holding ring 74 are integrated is formed (see FIG. 7). A part of the structure in the circumferential direction is bent inward to reduce the diameter to a substantially heart shape, and the structure in the reduced diameter state is carried into the existing pipe 12. Then, by returning the structure to a cylindrical shape at a position covering the annular groove 60 in the existing pipe 12, the outer peripheral surface of the waterproof sheet 70 is brought into close contact with the inner peripheral surface of the existing pipe 12. After that, the second pressing ring 76 is reduced in diameter to a substantially heart shape, carried into the existing pipe 12, and placed at a predetermined position in the water blocking sheet 70. Then, by returning the second pressing ring 76 to a cylindrical shape, the waterproof member 62 in which the waterproof sheet 70, the first pressing ring 74 and the second pressing ring 76 are integrated covers the existing pipe so as to cover the annular groove 60. It is installed in 12.

After that, the water blocking member 62 is fixed to the inner peripheral surface of the existing pipe 12 by using a fixing tool 86 such as a concrete screw. At this time, it is preferable to provide a plurality of fixtures 86 so as to be arranged at predetermined intervals in the circumferential direction (for example, every 100 mm). Further, the fixture 86 may be provided so as to penetrate both ends of the water stop sheet 70 and the holding member 72 in the axial direction at a position between the two water stop rings 84 provided on both sides of the annular groove 60. By fixing the water stop member 62 to the inner peripheral surface of the existing pipe 12 by using the fixture 86, the water stop ring 84 can be more reliably compressed between the existing pipe 12 and the water stop member 62. Further, when the existing pipe 12 is deformed at the portion of the annular groove 60, the water blocking member 62 can more reliably follow the deformation.

After installing the water blocking member 62 on the inner peripheral surface of the existing pipe 12, a spacer 18 is subsequently installed on the top of the inner peripheral surface of the existing pipe 12 along the pipe axis direction (see FIG. 1). The spacer 18 forms a guide passage for introducing the injection hose of the filler 16 between the existing pipe 12 and the lining pipe 14. Further, the spacer 18 prevents the lining pipe 14 from floating due to the injected filler 16 and improves the strength of the formed rehabilitation pipe 10.

After installing the spacer 18 on the top of the inner peripheral surface of the existing pipe 12, the lining pipe 14 is subsequently constructed in the existing pipe 12 using a pipe making machine as shown in FIGS. 1 and 8 (C). Here, first, while pulling the strip member 20 into the existing pipe 12, the strip member 20 is spirally wound along the inner peripheral surface of the existing pipe 12 to temporarily form the spiral pipe. At this time, a gap corresponding to the fitting allowance of the connecting member 22 is provided between the adjacent side edges of the strip member 20. Further, while proceeding with this temporary pipe making work, in the temporarily made spiral pipe, the adjacent side edge portions of the strip member 20 are connected to each other by the connecting member 22 in order from the start position using a pipe making machine. go. That is, the lining pipe 14 along the inner peripheral surface of the existing pipe 12 is manufactured by sequentially fitting the first fitting portion 34 of the strip member 20 and the second fitting portion 42 of the connecting member 22. ..

After forming the lining pipe 14 in the existing pipe 12, the cement milk-based filler 16 is subsequently injected between the inner peripheral surface of the existing pipe 12 and the outer peripheral surface of the lining pipe 14. When the filler 16 is solidified, a rehabilitation pipe 10 in which the existing pipe 12 and the lining pipe 14 are integrated by the filler 16 is formed as shown in FIG. After that, the rehabilitation work of the existing pipe 12 is completed by appropriately carrying out the tidying up work and the like.

As shown in FIG. 9, the rehabilitation pipe 10 formed as described above includes the existing pipe 12, the annular groove 60 formed on the inner peripheral surface of the existing pipe 12, and the existing pipe 12 so as to cover the annular groove 60. Between the water stop member 62 provided on the inner peripheral surface of the existing pipe 12, the lining pipe 14 formed along the inner peripheral surface of the existing pipe 12, and the inner peripheral surface of the existing pipe 12 and the outer peripheral surface of the lining pipe 14. It is provided with a filler 16 filled in.

In such a rehabilitation pipe 10, since the existing pipe 12 has an annular groove 60, as shown in FIG. 10, when a large force acts on the rehabilitation pipe 10 due to an earthquake or the like, the annular groove 60 of the existing pipe 12 The portion cracks before the other portions, causing extension and bending of the existing pipe 12 at the portion of the annular groove 60. That is, since the damaged portion of the existing pipe 12 can be induced in the portion of the annular groove 60, it is possible to prevent the existing pipe 12 (and thus the rehabilitation pipe 10) from being damaged in other portions.

Further, when the existing pipe 12 is deformed in the portion of the annular groove 60, the groove portion 48 of the lining pipe 14 is broken in the width direction and the flexible portion 50 is greatly extended, so that the existing pipe 12 maintains the watertightness. Follows the deformation of. That is, even if the existing pipe 12 is deformed and damaged at the portion of the annular groove 60, the function of the rehabilitation pipe 10 as a pipe line is appropriately maintained by the lining pipe 14.

Further, by forming the annular groove 60 in the vicinity of the connection portion 82 between the existing pipe 12 and the manhole 80, when the existing pipe 12 is cracked in the portion of the annular groove 60, the existing pipe 12 is replaced with the manhole 80. The portion including the connection portion 82 with and the other portion are separated from each other and behave independently of each other. That is, in the event of an earthquake, the displacement is absorbed by the portion of the annular groove 60, and the load on the connecting portion 82 is reduced, so that the connecting portion 82 is prevented from being damaged.

Furthermore, even if the existing pipe 12 is deformed and damaged at the portion of the annular groove 60, the water blocking sheet 70 is deformed so that the extendable portion 70a expands, and the first holding ring 74 and the water blocking member 62 By deforming the presser member 72 so that the second presser ring 76 moves away from each other, the presser member 72 follows the deformation of the existing pipe 12 while maintaining the watertightness. As a result, inundation from the damaged portion of the existing pipe 12 is blocked by the water blocking member 62, and the inundation of the lining pipe 14 is prevented.

Further, even if the water blocking member 62 is deformed when the existing pipe 12 is damaged, the overlapping portion 78 between the first pressing ring 74 and the second pressing ring 76 remains, that is, the entire inner peripheral surface of the waterproof sheet 70 is pressed. By maintaining the state of being supported by the member 72, it is appropriately prevented that the waterproof sheet 70 (and by extension, the waterproof member 62) is significantly deformed by the external water pressure.

As described above, according to this embodiment, since the water blocking member 62 is provided so as to cover the annular groove 60, even if the existing pipe 12 is deformed and damaged at the portion of the annular groove 60 during an earthquake or the like, the water blocking member 62 is provided. It is possible to prevent water from reaching the lining pipe 14 from the damaged portion. Therefore, it is possible to prevent the lining pipe 14 from being significantly deformed by the external water pressure.

In the above embodiment, the water stop ring 84 is installed on the inner peripheral surface of the existing pipe 12, and then the water stop member 62 is provided, but the present invention is not limited to this. A water stop ring 84 is attached in advance to the outer peripheral surface of the water stop member 62 on the ground, and a structure in which the water stop member 62 (or a part of the water stop member 62) and the water stop ring 84 are integrated is an existing pipe. It may be installed on the inner peripheral surface of 12. By reducing the work in the existing pipe 12, the burden on the operator can be reduced.

Further, in the above-described embodiment, two water stop rings 84 are provided on both sides of the annular groove 60, but the number and arrangement positions of the water stop rings 84 can be appropriately changed. However, it is preferable to provide at least one water stop ring 84 on both sides of the annular groove 60 at a position closer to the annular groove 60 than the fixture 86.

Further, the water stop ring 84 does not necessarily have to be provided. For example, instead of providing the water stop ring 84, one or a plurality of annular protrusions extending in the circumferential direction may be formed on the outer peripheral surface of the fixing portion 70b of the water stop sheet 70.

Furthermore, in the above-described embodiment, the fixture 86 is provided so as to penetrate both the waterproof sheet 70 and the holding member 72, but the present invention is not limited to this. For example, as shown in FIG. 11, each of the first pressing ring 74 and the second pressing ring 76 is provided with extending portions 74a and 76a protruding axially outward from the waterproof sheet 70, and the extending portions 74a are provided. Fixture 86 can also be provided so as to penetrate through the 76a. That is, the fixture 86 can be provided so as not to penetrate the waterproof sheet 70.

Further, in the above-described embodiment, the stretchable portion 70a is formed by folding the waterproof sheet 70 in the axial direction, but the shape of the expandable portion 70a can be changed as appropriate. For example, as shown in FIG. 12, the extendable portion 70a of the waterproof sheet 70 can be formed into a wave shape that repeats unevenness in the axial direction. Further, as shown in FIG. 13, the extendable portion 70a of the waterproof sheet 70 can be formed into a substantially U-shaped cross section protruding outward in the radial direction. In this case, it is preferable to provide the waterproof member 62 on the inner peripheral surface of the existing pipe 12 by fitting the expandable portion 70a of the waterproof sheet 70 into the annular groove 60. Further, the waterproof sheet 70 does not necessarily have to have an expandable portion 70a, and can follow the deformation of the existing pipe 12 by expanding due to the elasticity (rubber elasticity) of the waterproof sheet 70 itself due to the material. You can also do it.

Further, in the above-described embodiment, the second pressing ring 76 is formed so as to have a smaller diameter than that of the first pressing ring 74, but the present invention is not limited to this. As shown in FIG. 13, a recessed portion 76b in which the side edge portion of the second pressing ring 76 is recessed inward in the radial direction is formed in the second pressing ring 76, and the recessed portion 76b is formed into the side edge of the first pressing ring 74. The overlap portion 78 can also be formed by overlapping the portions.

Furthermore, in the above-described embodiment, when the waterproof sheet 70 and the first presser ring 74 and the second presser ring 76 are integrated, the diameter of the first presser ring 74 and the second presser ring 76 is reduced to a substantially heart shape. I tried to do it, but it is not limited to this. For example, each of the first presser ring 74 and the second presser ring 76 is provided with a notch that is separable in the circumferential direction. Then, after arranging the first pressing ring 74 and the second pressing ring 76 in a state where the diameter is reduced so as to overlap the cut portions in the waterproof sheet 70, the water blocking sheet 70 is returned to the original size. And the first presser ring 74 and the second presser ring 76 can be integrated.

Further, the first pressing ring 74 and the second pressing ring 76 can also be formed by combining a plurality of arcuate ring pieces divided in the circumferential direction. When the first presser ring 74 and the second presser ring 76 are formed by using a plurality of arcuate ring pieces, it is not always necessary to form the first presser ring 74 and the second presser ring 76 with spring steel.

Further, in the above-described embodiment, when the existing pipe 12 is deformed at the portion of the annular groove 60, the overlapping portion 78 between the first presser ring 74 and the second presser ring 76 remains. Not limited to. As long as the water stop sheet 70 can withstand the external water pressure due to flooding, the first presser ring 74 and the second presser ring 76 may be separated from each other (slightly open).

Further, in the above-described embodiment, the pressing member 72 is composed of the first pressing ring 74 and the second pressing ring 76, but the pressing member 72 can also be formed by one pressing ring. In this case, the one side edge portion of the presser ring (pressing member 72) is fixed with the fixture 86 in a cantilever fixing manner, and the other side edge portion of the pressing ring is in the same axial direction as the overlapping portion 78. It is preferable to project the waterproof sheet 70 to the outside in the axial direction by the length.

Furthermore, in the above-described embodiment, the connecting member 22 provided with the extendable portion 46 is used, but a similar extendable portion can be formed on the strip member 20.

Further, the lining member such as the strip member 20 and the connecting member 22 does not necessarily have to be provided with an extendable portion by itself, and the connecting portion is bent (deformed) to the extent that the fitting is not disengaged, so that the lining pipe 14 is formed. You may make it stretch. That is, the connecting portion between the lining members (the first fitting portion 34 and the second fitting portion 42) may function as an extendable portion.

Further, in contrast to forming an extensible lining tube, it is not always necessary to use a lining member having an extensible portion, and by forming the lining member with an extensible material such as polyethylene, the lining tube is extensible. It doesn't matter if you have. Further, the lining tube does not necessarily have to have extensibility.

Further, in the above-described embodiment, the connecting members 22 are used to connect the adjacent side edges of the strip members 20, but the present invention is not limited to this, and the strip members are fitted to each other on both side edges of the strip members. By forming the fitting portion, the side edge portions of the strip member may be directly connected to each other. That is, when the strip-shaped lining member is spirally wound to form a lining tube, two or more types of strip-shaped lining members may be used in combination, or one type of strip-shaped lining member may be used in combination. The lining member may be used alone.

Furthermore, the lining tube does not necessarily have to be formed by spirally winding a strip-shaped lining member. For example, an arc-shaped lining member may be used, and the lining tube may be formed by connecting the arc-shaped lining members in the circumferential direction and the pipe axis direction. In this case, for example, it is preferable to make the connecting portion of the lining member in the pipe axis direction have extensibleness, that is, to make the connecting portion an extensible portion so that the lining pipe has extensibleness.

The specific numerical values such as the dimensions given above are merely examples, and can be appropriately changed as necessary, such as the specifications of the product and the diameter of the existing pipe 12 to be rehabilitated.

10 ... Rehabilitation pipe 12 ... Existing pipe 14 ... Lining pipe 16 ... Filler 18 ... Spacer 20 ... Band plate member 22 ... Connecting member 46 ... Connecting member (lining pipe) extendable part 60 ... Circular groove 62 ... Water blocking member 70 ... Water stop sheet 70a ... Extendable part of water stop sheet 72 ... Presser member 74 ... 1st presser ring 76 ... 2nd presser ring 84 ... Water stop ring 86 ... Fixing tool

The eighth invention is a rehabilitation pipe in which an existing pipe and a lining pipe are integrated by a filler, and is an annular groove or an annular groove formed so as to extend in the circumferential direction at a predetermined position on the inner peripheral surface of the existing pipe. It is provided on the inner peripheral surface of the existing pipe so as to cover the A short tubular water stop member that prevents water from entering, a lining pipe provided along the inner peripheral surface of the existing pipe, and a filling between the inner peripheral surface of the existing pipe and the outer peripheral surface of the lining pipe. Rehabilitation provided with a filler, the waterproof member is separate from the lining pipe, and both ends of the waterproof member are in close contact with the inner peripheral surface of the existing pipe in a waterproof state. It is a tube.

Claims (8)

It is a pipeline rehabilitation method in which an existing pipe and a lining pipe are integrated by a filler to form a rehabilitation pipe.
(A) An annular groove extending in the circumferential direction is formed at a predetermined position on the inner peripheral surface of the existing pipe.
(B) After the step (a), when the existing pipe is deformed in the annular groove portion, a short cylindrical water stop that follows the deformation of the existing pipe and prevents water from entering the lining pipe side. The member is provided on the inner peripheral surface of the existing pipe so as to cover the annular groove.
(C) After the step (b), the lining pipe is constructed along the inner peripheral surface of the existing pipe, and (d) after the step (c), the inner peripheral surface of the existing pipe and the said. A pipeline rehabilitation method in which the filler is filled between the lining pipe and the outer peripheral surface. The first aspect of the present invention, wherein the water-stopping member includes a short-cylindrical water-stopping sheet arranged so as to face the annular groove, and a pressing member that presses and supports the water-stopping sheet from the inner peripheral surface side. How to rehabilitate the pipeline. The method for rehabilitating a pipeline according to claim 2, wherein the waterproof sheet has an extendable portion at a central portion in the axial direction. The presser member includes a first presser ring and a second presser ring.
The pipeline according to claim 2 or 3, wherein the first pressing ring and the second pressing ring are provided on the inner peripheral surface side of the water blocking sheet in a state where the side edges thereof are overlapped with each other by a predetermined width. Rehabilitation method. In the step (b), a water stop ring formed of an elastic sealing material is further provided on both sides of the annular groove between the inner peripheral surface of the existing pipe and the outer peripheral surface of the water stop member. The pipeline rehabilitation method according to any one of claims 1 to 4. The pipeline rehabilitation method according to any one of claims 1 to 5, wherein in the step (b), the water blocking member is fixed to the inner peripheral surface of the existing pipe by a fixing tool. The method for rehabilitating a pipeline according to any one of claims 1 to 6, wherein in step (c), a lining tube having an extendable portion is formed. It is a rehabilitation pipe in which the existing pipe and the lining pipe are integrated by a filler.
An annular groove formed so as to extend in the circumferential direction at a predetermined position on the inner peripheral surface of the existing pipe.
It is provided on the inner peripheral surface of the existing pipe so as to cover the annular groove, and when the existing pipe is deformed at the portion of the annular groove, it follows the deformation of the existing pipe and prevents water from entering the lining pipe side. Short tubular water stop member,
The lining pipe provided along the inner peripheral surface of the existing pipe, and
A rehabilitation pipe provided with the filler filled between the inner peripheral surface of the existing pipe and the outer peripheral surface of the lining pipe.

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