Strip material for rehabilitated pipe and method for constructing rehabilitated pipe

Abstract

[Problem] To provide a means for a strip material (A) that can be spirally wound to construct a rehabilitated pipe, the means providing excellent conformability when an existing pipe has a corner portion or when an external force is applied to the new pipe body due to an earthquake or the like. [Solution] The strip material (A) comprises at least: an elongated belt portion 10; a fitting recess portion 20 provided at one end in the shorter direction on one surface side of the belt portion 10; a fitting projection portion 30 provided at the other end in the shorter direction on the one surface side of the belt portion 10; and a folded portion 50 provided midway along the shorter direction on the one surface side of the belt portion 10. A widening slit 60 is provided on the one surface side of the belt portion 10 between a connection part between the belt portion 10 and one end of the folded potion 50 and a connection part between the band portion 10 and the other end of the folded portion 50.

Description

Strip material for rehabilitation pipe and method for constructing rehabilitation pipe

[0001] The present invention relates to a strip material used to form a new pipe (rehabilitation pipe) by spirally wrapping it around the inside of an existing pipe, such as a buried pipe buried underground, in order to rehabilitate the existing pipe, and to a method for constructing the rehabilitation pipe.

[0002] A known pipe rehabilitation method for rehabilitating an existing underground pipe involves spirally wrapping a strip of material around the inside of the existing pipe to construct a new pipe (rehabilitated pipe), and then filling a filler material between the inner circumferential surface of the existing pipe and the rehabilitated pipe to obtain a rehabilitated pipe structure. An example of this strip material is a band-shaped material described in Patent Document 1 below.

[0003] JP 2019-163790 A

[0004] However, the band-shaped body described in Patent Document 1 still had room for improvement in terms of followability when the existing pipe has corners or when an external force acts on the new pipe due to an earthquake or the like.

[0005] Therefore, one of the objects of the present invention is to provide a strip material for rehabilitation pipes that has excellent followability when the existing pipe has corners or when external forces are applied to the new pipe body due to an earthquake, etc.

[0006] The present invention, which has been made to solve the above-mentioned problems, is a strip material for rehabilitating pipes that can be constructed by spirally winding, and has at least a long band portion, a fitting recess provided at one end in the short direction of one surface of the band portion, a fitting protrusion provided at the other end in the short direction of one surface of the band portion, and a plurality of fold portions provided midway along the short direction of one surface of the band portion, and is configured so that the intended cutting point is between the connection point between the band portion and one end of the fold portion and the connection point between the band portion and the other end of the fold portion.

[0007] With this configuration, if the existing pipe has a corner, the planned cutting location on the band can be cut in advance from the other side of the band, allowing the folded-back portion to unfold appropriately and construct a new pipe to follow the corner. Furthermore, even if an external force acts on the new pipe after pipe rehabilitation, such as an earthquake, the folded-back portion that is pre-cut and ready to unfold, or the folded-back portion cut by the external force, can follow the movement of the pipe due to the external force. Furthermore, by having multiple folded-back portions, the number of cuts at the planned cutting location can be adjusted, allowing the above-mentioned followability to be adjusted appropriately depending on the site conditions.

[0008] According to the present invention, a strip material can be obtained that has excellent conformability when an existing pipe has corners or when an external force is applied to a new pipe due to an earthquake or the like.

[0009] 1 is a schematic diagram showing the overall configuration of a strip material according to the present invention;

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] <1> Overall Structure (Fig. 1) The strip material A according to the present invention is a member that is wound around an existing pipe to construct a new pipe (rehabilitation pipe), and mainly includes at least a band portion 10, a fitting protrusion portion 30, a fitting recess portion 20, and a folded-back portion 50, and may further include a rib portion 40 as needed. The strip material A according to the present invention is configured by providing a slit 60 at a specific location on the band portion 10. In the present invention, the material of the strip material A is not particularly limited. Details of each part will be described below.

[0012] <2> Band portion (Fig. 1) The band portion 10 is a member corresponding to the main body portion of the strip material A. The band portion 10 is a long member, and the longitudinal direction of the band portion 10 constitutes the circumferential direction of the rehabilitating pipe, while the lateral direction of the band portion 10 constitutes the axial direction of the rehabilitating pipe. In the present invention, one side is defined as corresponding to the outer surface side of the constructed rehabilitating pipe, and the other side is defined as corresponding to the inner surface side of the rehabilitating pipe. Furthermore, in the present invention, one side is defined as corresponding to the outer surface side of the axial direction of the rehabilitating pipe, and the other side is defined as corresponding to the inner surface side of the rehabilitating pipe.

[0013] <3> Fitting Recess (FIG. 1) The fitting recess 20 is a portion for fitting with a fitting protrusion 30 provided on the adjacent strip material A one span later when the strip material A is spirally wound to construct a rehabilitating pipe. In the present invention, the shape of the fitting recess 20 is not particularly limited as long as it has a shape corresponding to the fitting protrusion 30 described later. Furthermore, in the present invention, the fitting recess 20 is provided at one end in the short direction on one surface side of the band portion 10. In this embodiment, the fitting protrusion 30 is configured with a housing portion 21 capable of housing an insertion portion 31 of the fitting protrusion 30 described later, a short rib portion 22 protruding from the top of the housing portion so as to be flush with the rib portion 40 described later, and a claw portion 23 extending obliquely upward from the bottom of the housing portion 21.

[0014] <4> Engagement Protrusion (FIG. 1) The engagement protrusion 30 is a portion for engaging with the engagement recess 20 provided on the adjacent strip material A one span before when the strip material A is spirally wound to construct a rehabilitating pipe. In the present invention, the shape of the engagement protrusion 30 is not particularly limited as long as it has a shape corresponding to the engagement recess 20 described above. Furthermore, in the present invention, the engagement protrusion 30 is provided at the other end of one surface of the band portion 10 in the short direction. In this embodiment, the engagement protrusion 30 has an extension length approximately half that of the extension length of the rib portion 40 described later on the one surface side, and is configured by an insertion portion 31 provided with a flange on the open end side, and an end rib portion 32 provided adjacent to the insertion portion 31, having a shape substantially identical to the rib portion 40 described later, and provided with an engaging portion 321 on the support portion with which the claw portion can engage.

[0015] <5> Rib Section (FIG. 1) The rib section 40 is a section for improving the integrity of the existing pipe and the rehabilitating pipe through the filler material filled between them. While the rib section 40 is not an essential element in the present invention, providing the rib section 40 is preferable from the viewpoint of improving the integrity of the existing pipe and the rehabilitating pipe. The shape and number of the rib sections 40 are not particularly limited in the present invention. In this embodiment, multiple rib sections 40 are provided at intervals in the lateral direction of one side of the band section 10. In some locations, the rib sections 40 are continuously arranged at intervals in the lateral direction of the band section 10, or are arranged with a folded section 50 (described later) interposed therebetween.

[0016] <6> Folded-up portion (FIG. 1) The folded-up portion 50 is a portion for increasing the length (width) of the band portion 10 in the lateral direction as necessary, thereby enabling the strip material A to be expanded in width. In the present invention, the rib portion 40 is provided midway along the lateral direction on one side of the band portion 10, and the number of rib portions 40 is not particularly limited. In the present invention, the folded-up portion 50 is a portion that extends from the band portion 10, is folded back along the lateral direction, and reaches the band portion 10, and the shape of the folded-up portion 50 is not particularly limited. In this embodiment, multiple folded-up portions 50 are provided at intervals along the lateral direction on one side of the band portion 10. The folded-up portion 50 is in an inverted U-shape, and the folded position is approximately the same height as the top of the rib portion 40. The area between the connection point between one end of the folded portion 50 and the band portion 10 and the connection point between the other end of the folded portion 50 and the band portion 10 is the area (planned cutting area 11) where cutting is planned when the strip material A is widened.

[0017] In addition, in the present invention, providing multiple folding portions 50 ensures multiple planned cutting locations 11, which is preferable in that it widens the range for adjusting the followability as the strip material A is widened.

[0018] <7> Slits (Figure 1) The slits 60 are provided at the planned cutting locations 11 of the band portion 10 to promote active cutting and natural cutting of the planned cutting locations 11 of the band portion 10. The planned cutting locations 11 of the band portion 10 with the slits 60 are thinner and more fragile than the rest of the band portion 10, facilitating active cutting using a cutting tool X or the like provided in a pipe manufacturing device for the strip material A, or natural cutting due to external pressure generated by factors such as an earthquake on the rehabilitated pipe after installation. In the present invention, the slits 60 are provided on one side of the band portion 10, but not on the other side. This is to ensure that the inner circumferential surface of the rehabilitated pipe is flat. In this embodiment, the slits 60 are formed at the planned cutting locations 11 of the band portion 10 by providing a recess on one side of the band portion 10.

[0019] <8> Image of widening of strip material (Figure 2) As shown in Figure 2, when the intended cutting point 11 of the band portion 10 is cut using a cutting tool X or the band portion 10 is naturally cut by being pulled in the short direction by external pressure, the folded portion 50 becomes capable of expanding in the short direction of the band portion 10, and the strip material A can be widened.

[0020] <9> Usage image (not shown) Next, an image of how the strip material A according to the present invention is used will be described. Pipe rehabilitation methods using strip material A mainly include two types: a method in which a pipe production device is installed at the entrance of the existing pipe and a rehabilitated pipe constructed on the spot is pushed into the interior of the existing pipe (a push-type method), and a method in which a pipe production device with a self-propelled mechanism is inserted into the entrance of the existing pipe and the pipe production device self-propels within the existing pipe while constructing a rehabilitated pipe behind the pipe production device (a self-propelled method). Below, an example of a usage method for each case will be described. Note that the present invention is not limited to the usage methods described below.

[0021] <9.1> Push-to-reach type when the existing pipe has a corner In the push-to-reach type, for the portion of the rehabilitating pipe constructed at the entrance of the existing pipe that will ultimately be located further back in the extrusion direction than the corner, the rehabilitating pipe must pass through the corner during extrusion, so the planned cutting locations 11 of the band portion 10 are proactively cut by the pipe making device or manually by an operator to accommodate at least the bending of the corner. Note that this embodiment does not exclude the proactive cutting of the planned cutting locations 11 of the band portion 10 for the portion of the rehabilitating pipe constructed at the entrance of the existing pipe that will ultimately be located further forward in the extrusion direction than the corner.

[0022] <9.2> Self-propelled type when the existing pipe has a corner In the case of a self-propelled type, there is no need to actively cut the planned cutting portion 11 of the band portion 10 in all sections, and it is sufficient to use the pipe making device to actively cut the planned cutting portion 11 of the band portion 10 at least in the section from the time the pipe making device approaches the entrance to the corner portion to the time it passes the exit of the corner portion. Note that this embodiment does not exclude the case where the planned cutting portion 11 of the band portion 10 is actively cut in advance in the straight section of the existing pipe.

[0023] <9.3> In the case of a push-button or self-propelled type where the existing pipe does not have corners In this example, although it is necessary to actively cut the planned cutting portions 11 of the band portion 10 in order to advance the rehabilitating pipe, it is also possible to proactively cut appropriate portions from among the planned cutting portions of the band portion 10 in advance in preparation for the possibility that the rehabilitating pipe will be subjected to external pressure due to factors such as an earthquake. Also, in this example, the cutting operation of the planned cutting portions 11 of the band portion 10 may be performed continuously or intermittently in the longitudinal direction of the band portion 10.

[0024] A: Strip material 10: Belt portion 11: Planned cutting location 20: Fitting recess 21: Storage portion 22: Short rib portion 23: Claw portion 30: Fitting protrusion 31: Insertion portion 32: End rib portion 40: Rib portion 50: Folded portion 60: Slit X: Cutting tool

Claims

1. A strip material for a rehabilitation pipe that can construct a rehabilitation pipe by being spirally wound, comprising: a long strip portion; a fitting recess provided at one end in the short-side direction on one surface side of the strip portion; a fitting protrusion provided at the other end in the short-side direction on one surface side of the strip portion; and a plurality of folding portions provided in the middle of the short-side direction on one surface side of the strip portion. In the strip portion, the connection portion between the strip portion and one end of the folding portion and the connection portion between the strip portion and the other end of the folding portion are defined as planned cutting locations. A strip material for a rehabilitation pipe, characterized by the above.

2. The strip material for a rehabilitation pipe according to claim 1, characterized in that a slit is provided on one surface side of the strip portion among the planned cutting locations.

3. A method for constructing a rehabilitation pipe using a push-type pipe manufacturing device, characterized in that after cutting the planned cutting location provided on the strip material according to claim 1, the strip material is spirally wound and the constructed rehabilitation pipe is sent out to an existing pipe. A method for constructing a rehabilitation pipe.

4. A method for constructing a rehabilitation pipe using a push-type pipe manufacturing device, characterized in that the planned cutting location provided on the strip material according to claim 1 is intermittently cut in the longitudinal direction of the strip material, and then the strip material is spirally wound and the constructed rehabilitation pipe is sent out to an existing pipe. A method for constructing a rehabilitation pipe.

5. A method for constructing a rehabilitation pipe using a self-propelled pipe manufacturing device, characterized in that at the corner portion of an existing pipe, after cutting the planned cutting location provided on the strip material according to claim 1, the strip material is spirally wound to construct a rehabilitation pipe. A method for constructing a rehabilitation pipe.

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