Rehabilitation methods for existing pipes

Abstract

In a pipe rehabilitation method that uses a self-propelled pipe manufacturing device to line the inner circumference of an existing pipe with a different cross-section with a spiral-shaped rehabilitation pipe, economic efficiency is improved by expanding or contracting the rehabilitation diameter to match the different cross-section during the rehabilitation process, and accurate structural and flow rate calculations can be performed before the actual rehabilitation work. [Solution] A self-propelled pipe-making device 10 is used to manufacture a spiral-shaped rehabilitated pipe 3 on the inner circumference of an existing pipe 1 having a normal cross section 1c and a different cross section 1d. Prior to the actual pipe manufacturing, the normal design rehabilitation diameter D3 of the rehabilitated pipe 3 is determined based on the existing pipe diameter D1 of the normal cross section 1c, and the maximum change design rehabilitation diameter D is determined when the rehabilitated pipe 3 undergoes the greatest diameter change according to the different cross section 1d. 3d Determine the following. Furthermore, design diameter change distance L for changing the diameter of the rehabilitation pipe 3. rd ,L ep Determine the position of the different cross-sectional section 1d in the pipe axis direction and the design diameter change distance L. rd ,L ep Based on this, the design diameter change start and end point AP, where the diameter change in the pipe axis direction begins or ends, is determined.

Description

Technical Field

[0001] The present invention relates to a method for rehabilitating an existing pipe by forming a helical rehabilitation pipe along the inner circumference of the existing pipe such as an aged sewer pipe using a self-propelled pipe making apparatus, and particularly to an existing pipe rehabilitation method suitable for an existing pipe having an irregular cross-section caused by axial misalignment, steps, protrusions and the like. Background Art

[0002] A method for rehabilitating an existing pipe by forming a helical rehabilitation pipe while propelling (self-propelling) a self-propelled pipe making apparatus along the inner circumference of the existing pipe is publicly known (see Patent Documents 1 to 3, etc.) . The rehabilitation pipe is formed of a long synthetic resin strip member (profile). The strip member is spirally wound along the inner circumference of the existing pipe, and adjacent edges one pitch apart are engaged with each other in a concave-convex fit, thereby forming the helical rehabilitation pipe.

[0003] Generally, the self-propelled pipe making apparatus is an inner circumference regulation type comprising an apparatus main body and an annular inner circumference regulator called a link roller (see Patent Documents 1, 2, etc.). A pipe forming end (pipe end at the forward stretching side) of the rehabilitation pipe during pipe forming is wound around the outer circumference of the inner circumference regulator, so that it is regulated from the inner circumference side. The apparatus main body is provided at one position in the circumferential direction of the inner circumference regulator. The apparatus main body is provided with at least a pair of driving rollers and a driving motor that rotationally drives the driving rollers. In the strip member, an unformed subsequent strip portion continuous with said pipe forming end of the rehabilitation pipe is introduced between and clamped by the pair of driving rollers, and the opposing edges of the subsequent strip portion and the pipe forming end are engaged with each other in a concave-convex fit. As a result, the subsequent strip portion is incorporated into the rehabilitation pipe to become a new pipe forming end, and the pipe forming of the rehabilitation pipe proceeds. Along with the pipe forming, the pipe making apparatus is propelled in the spiral winding direction, and the pipe forming end is shifted forward in the stretching direction.

[0004] In the inner circumference regulation type self-propelled pipe making apparatuses of Patent Documents 1 and 2, an expansion and contraction mechanism is provided on the inner circumference regulator. The circumferential length or diameter of the inner circumference regulator can be adjusted to expand or contract by the expansion and contraction mechanism.

[0005] As disclosed in Patent Document 3, etc., a self-propelled pipe-making device without an inner circumference restricting body is also known. With this pipe-making device, the pipe-making end in front of the extension of the rehabilitated pipe during pipe-making is open to the inner circumference side, except for the portion engaged with the device body. Multiple pipe end guides are provided on the bottom of the device body facing outward in the radial direction of the pipe. Each pipe end guide is engaged with the pipe-making end of the rehabilitated pipe so as to be slidable in the circumferential direction. Since the self-propelled pipe-making device without an inner circumference restricting body does not require an inner circumference restricting body, it can be made smaller.

[0006] Furthermore, in the non-inner circumference regulating self-propelled pipe-making device described in Patent Document 3, a braking mechanism (expansion / contraction mechanism) and an outer circumference regulating wire are added. During propulsion, the braking mechanism can apply frictional resistance (braking force) between the pipe-making end and the device. By adjusting the braking force, the propulsion speed can be increased or decreased relative to the feeding speed of the trailing section by the drive roller, thereby expanding or contracting the pipe diameter at the pipe-making end. The outer circumference regulating wire is wound around the outer circumference of the pipe-making end of the rehabilitated pipe, and both ends are connected to the device body. By adjusting the length of the outer circumference regulating wire, the circumference and thus the pipe diameter of the pipe-making end of the rehabilitated pipe can be regulated from the outer circumference. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] International release WO2008 / 075681 [Patent Document 2] Japanese Patent Publication No. 2010-023350 [Patent Document 3] Japanese Patent Publication No. 2020-093420 [Overview of the project] [Problems that the invention aims to solve]

[0008] In aging sewer pipes and other existing pipes, the pipe axes of a row of pipe bodies constituting the existing pipe may be misaligned, steps or protrusions may be formed on the inner wall, foreign objects such as pipes may be present, the inner diameter may differ in parts, or the pipe axis may be bent. When performing rehabilitation work, it is necessary to be able to manufacture pipes even in such sections with different cross-sections.

[0009] On the other hand, in many actual pipe rehabilitation construction sites, regardless of the presence or absence of sections with different cross-sections, the pipe diameter of the rehabilitation pipe (hereinafter referred to as "rehabilitation diameter") was manufactured to a constant diameter throughout the entire span from the launch manhole at one end of the existing pipe to the arrival manhole at the other end. The reasons for this include the fact that even if the rehabilitation diameter is changed by adjusting the expansion and contraction mechanism midway through a span, it is difficult to determine on-site where and to what extent the expansion and contraction adjustments should be made, and it is also difficult to grasp how the rehabilitation diameter actually changed as a result of the adjustments. For this reason, it was necessary to match the rehabilitation diameter of the entire span to the section with a smaller diameter than the normal cross-section. This reduces the flow rate of water that can be flowed through the rehabilitation pipe. In addition, the amount of backfill material to be filled between the existing pipe and the rehabilitation pipe increases, which increases construction costs and makes it economically unfeasible.

[0010] Even if the pipe is manufactured while adjusting the diameter during rehabilitation, it is difficult to perform structural and flow rate calculations because it is not possible to determine from which point to which point the rehabilitation diameter changes and how. For sections with different cross-sections, instead of manufacturing spiral-shaped rehabilitation pipes made of strip-shaped members, rehabilitation material may be applied separately by hand lay-up, but this method has poor workability.

[0011] In view of these circumstances, the present invention aims to improve economic efficiency in a rehabilitation method in which a spiral-shaped rehabilitation pipe is lined to the inner circumference of an existing pipe having a cross-sectional area using a self-propelled pipe manufacturing device, by expanding or contracting the rehabilitation diameter to match the cross-sectional area during the rehabilitation work, and to enable accurate structural calculations and flow rate calculations before the actual rehabilitation work. [Means for solving the problem]

[0012] To solve the aforementioned problems, the present invention provides a method for rehabilitating an existing pipe, comprising manufacturing a spiral-shaped rehabilitated pipe by winding a long strip-shaped member in a spiral manner using a pipe-making device that moves along the inner circumference of an existing pipe having a normal cross-section and a cross-section of a different cross-section, A step of determining the normal design rehabilitation diameter of the rehabilitation pipe based on the existing pipe diameter of the normal cross section, A step of determining the most varied design rehabilitation diameter in which the rehabilitation pipe undergoes the greatest diameter change according to the different cross-sectional portion, A step of determining the design diameter change distance for changing the diameter of the rehabilitation pipe from the normal design rehabilitation diameter to the most varied design rehabilitation diameter, or from the most varied design rehabilitation diameter to the normal design rehabilitation diameter, A step of determining the start and end points of the design diameter change, where the diameter change in the axial direction of the pipe, based on the position of the different cross-sectional portion in the pipe axis direction and the design diameter change distance, This is characterized by performing the above step prior to the actual pipe manufacturing.

[0013] The aforementioned "normal cross-section" refers to the portion of an existing pipe where the shape, size, and orientation of the pipeline cross-section perpendicular to the pipe axis are constant along the pipe axis. The aforementioned different cross-sectional section refers to a portion of an existing pipe where the shape or size of the pipeline cross-section perpendicular to the pipe axis differs from that of the normal cross-sectional section, or where the orientation of the pipeline cross-section changes along the pipe axis. The standard design rehabilitation diameter (outer diameter) is preferably set to about 0.8 to 1.0 times the diameter of the existing pipe (inner diameter). The most varied design rehabilitation diameter (outer diameter) is preferably set to about 0.8 to 1.0 times the diameter of the inscribed circle in the cross-sectional area of ​​the existing pipe where axial misalignment, steps, protrusions, etc., are formed. This prevents an increase in the amount of backfill material to be packed between the existing pipe and the rehabilitation pipe, thereby reducing construction costs. The aforementioned design diameter change distance can be calculated, for example, based on the design unit diameter reduction or design unit diameter expansion for each rehabilitated pipe manufactured per unit axial length, and the diameter difference between the normal design rehabilitation diameter and the most changed design rehabilitation diameter. This type of strip-shaped member (profile) for rehabilitating existing pipes has the characteristic of shrinking in diameter as it is manufactured in a spiral (see Patent Document 3, etc.). The design unit diameter reduction amount can be calculated from the analysis data and known implementation data. Furthermore, the design unit diameter expansion amount can be calculated from the diameter expansion capacity of the expansion and contraction mechanism of the self-propelled pipe-making device (see Patent Documents 1-3, etc.). Based on the calculated design diameter change distance and the location of the cross-sectional area in the existing pipe, the design diameter change start and end points for the rehabilitation pipe are determined. This provides a rehabilitation pipe model that defines the design rehabilitation diameter at each position along the pipe axis. Using this rehabilitation pipe model, accurate structural and flow rate calculations for the rehabilitation pipe can be performed before actual rehabilitation work. This allows for the design of the rehabilitation pipe to ensure the required strength and maximum flow rate, and to set appropriate allowable flow rates.

[0014] When the maximum design rehabilitation diameter is smaller than the normal design rehabilitation diameter, preferably, the design diameter reduction start point at the design diameter change start point is set to a position away from the different cross-sectional area toward the starting side in the pipe axis direction by the design diameter change distance in the diameter reduction direction required to reduce the rehabilitation pipe from the normal design rehabilitation diameter to the maximum design rehabilitation diameter. The design diameter expansion end point at the design diameter change start and end point is determined to be a position located away from the different cross-sectional area toward the destination side in the pipe axis direction by the distance of the design diameter change in the diameter expansion direction required to expand the rehabilitation pipe from the most changed design rehabilitation diameter to the normal design rehabilitation diameter. This allows for the creation of accurate rehabilitation pipe models, enabling precise structural and flow rate calculations. During actual rehabilitation work, the pipe manufacturing process begins around the design diameter reduction start point. This allows the actual rehabilitation diameter of the rehabilitated pipe to be the most varied design rehabilitation diameter in the section with a different cross-section, enabling smooth pipe manufacturing in that section. After passing through the section with a different cross-section, the pipe manufacturing process is carried out to end the diameter expansion around the design diameter expansion end point.

[0015] Preferably, the flow rate design of the rehabilitated pipe is performed using a rehabilitated pipe model for flow rate design, in which the entire diameter-changing pipe portion from the design diameter reduction start point to the design diameter expansion end point is defined as the maximum change design rehabilitation diameter, and the normal diameter pipe portions on both sides of the diameter-changing pipe portion in the pipe axis direction are defined as the normal design rehabilitation diameter. Flow design includes flow calculations to determine the allowable flow rate of the rehabilitated pipe and whether the rehabilitated pipe meets the required flow rate. This allows for a design that is on the safe side in terms of flow calculations.

[0016] Preferably, the structural design of the rehabilitated pipe is performed using a rehabilitated pipe model for structural design in which the entire area in the axial direction of the pipe is defined as the most varied design rehabilitation diameter. Structural design includes structural calculations to determine whether the rehabilitated pipe has the required strength. This allows for a design that is on the safe side in terms of structural calculations.

[0017] Preferably, the different cross-sectional portion is a misaligned portion, a stepped portion, a protruding portion, a portion with foreign matter, a portion with a different inner diameter, or a bent portion of the existing pipe. The misaligned section is a part of the pipe where the pipe axis changes in a stepped manner, and the shape and size of the pipe cross-section differ from that of the normal cross-section. A stepped section is a part of an existing pipe where a step has been formed on the inner circumference, and the shape and size of the pipe cross-section differ from that of a normal cross-section. The section with protrusions is a part of the existing pipe where protrusions are formed on the inner circumference, and the shape and size of the pipe cross-section differ from that of the normal cross-section. A section with foreign matter is a part of an existing pipe where foreign matter such as piping is present on the inner circumference, and the shape and size of the pipe cross-section differ from that of a normal cross-section. A section with a different inner diameter is a part of an existing pipe whose inner diameter differs from that of the normal cross-section, and includes both a section with a smaller diameter than the normal cross-section and a section with a larger diameter than the normal cross-section. A bent section is a part of an existing pipe where the pipe axis is bent, that is, a section of pipe where the orientation of the pipe cross-section perpendicular to the pipe axis changes along the pipe axis. By pre-determining the start and end points of design diameter changes for these different cross-sectional areas, structural and flow rate calculations can be performed accurately.

[0018] Preferably, the pipe manufacturing is performed by a non-inner circumference restricting self-propelled pipe manufacturing device having a braking mechanism, and the braking force applied by the braking mechanism to the propulsion of the self-propelled pipe manufacturing device is adjusted using the start and end points of the design diameter change as indicators. This allows the rehabilitation diameter to be expanded or contracted during the rehabilitation process to match the cross-section of the existing pipe, thereby reducing construction costs and improving economic efficiency. A self-propelled pipe-making device is a pipe-making device that is positioned at the pipe-making end ahead of the extension of a rehabilitated pipe during pipe-making, and is propelled (self-propelled) forward in the extension direction or in the spiral winding direction while the rehabilitated pipe is being manufactured. A non-internal circumference restricting self-propelled pipe-making machine refers to a self-propelled pipe-making machine that does not have an internal circumference restricting body that restricts the pipe-making end of the rebuilt pipe from the internal circumference side during pipe-making, and has a structure in which the pipe-making end is open to the internal circumference side, except for the part in which the self-propelled pipe-making machine is installed. The braking mechanism preferably engages with the pipe-making end and generates a braking force against the propulsion of the pipe-making device through friction between the end and the pipe-making end. By adjusting this braking force (including starting, increasing, decreasing, and releasing it), the amount of strip-shaped member fed by the pipe-making device is increased or decreased relative to the propulsion amount of the pipe-making device, and the pipe-making section is expanded or contracted.

[0019] Preferably, the pipe manufacturing is performed using an inner circumference regulating type self-propelled pipe manufacturing device having a spiral annular inner circumference regulating body, and the expansion and contraction mechanism provided on the inner circumference regulating body is adjusted using the start and end points of the design diameter change as indicators. The inner circumference restrictor restricts the pipe end of the rehabilitation pipe from the inner circumference side. The inner circumference restrictor is expanded or contracted by the expansion / contraction mechanism. Adjusting the expansion / contraction mechanism includes performing the expansion or contraction operation of the inner circumference restrictor by the expansion / contraction mechanism, or starting or ending the expansion or contraction operation of the inner circumference restrictor by the expansion / contraction mechanism. This makes it possible to expand or contract the rehabilitation diameter to match the cross-section of the existing pipe during rehabilitation work, thereby reducing construction costs and improving economic efficiency. [Effects of the Invention]

[0020] According to the present invention, when rehabilitating an existing pipe having a different cross-section by lining the inner circumference of the existing pipe with a spiral-shaped rehabilitation pipe using a self-propelled pipe manufacturing device, the rehabilitation diameter can be expanded or contracted to match the cross-section of the existing pipe, thereby reducing construction costs and improving economic efficiency, as well as enabling accurate structural and flow rate calculations before actual rehabilitation work. [Brief explanation of the drawing]

[0021] [Figure 1] Figure 1(a) shows a first embodiment of the present invention, and is a cross-sectional view along the line Ia-Ia in Figure 3, illustrating how an existing pipe with a misaligned cross-section is rehabilitated by a non-inner circumference regulated self-propelled pipe manufacturing device. Figure 1(b) is a cross-sectional view of the rehabilitated existing pipe. [Figure 2] Figure 2(a) is a cross-sectional view along the line IIa-IIa in Figure 1(b). Figure 2(b) is a cross-sectional view along the line IIb-IIb in Figure 1(b). [Figure 3] Figure 3 is a cross-sectional view taken along the line III-III in Figure 1. [Figure 4] Figure 4 is a flowchart of the preliminary steps, such as calculations, that are performed before the actual rehabilitation work. [Figure 5] Figure 5(a) is a cross-sectional view showing a pipe rehabilitation model for the existing pipe. Figure 5(b) is a graph of the rehabilitation diameter against the position in the pipe axis direction for each rehabilitation pipe model in Figure 5(a) with respect to the existing pipe. [Figure 6] Figure 6 is a cross-sectional view showing the rehabilitation of an existing pipe using an inner circumference regulating self-propelled pipe manufacturing device according to a second embodiment of the present invention. [Figure 7] Figure 7 shows a third embodiment of the present invention, where Figure 7(a) is a cross-sectional view showing a rehabilitated pipe model for pipe manufacturing for an existing pipe having a cross-sectional section consisting of a partially small-diameter pipe section. Figure 7(b) is a graph of the rehabilitation diameter against the position in the pipe axis direction for each rehabilitated pipe model for the existing pipe in Figure 7(a). [Figure 8] Figure 8 shows a fourth embodiment of the present invention, where Figure 8(a) is a cross-sectional view showing a rehabilitated pipe model for pipe manufacturing for an existing pipe having a cross-sectional section with a protruding portion. Figure 8(b) is a graph of the rehabilitation diameter against the position in the pipe axis direction for each rehabilitated pipe model for the existing pipe in Figure 8(a). [Figure 9] Figure 9 shows a fifth embodiment of the present invention, and Figure 9(a) is a cross-sectional view showing a rehabilitated pipe model for pipe manufacturing for an existing pipe having a different cross-sectional section consisting of a foreign matter portion. Figure 9(b) is a graph of the rehabilitation diameter against the position in the pipe axis direction for each rehabilitated pipe model for the existing pipe in Figure 9(a). [Figure 10]Figure 10 shows a sixth embodiment of the present invention, and Figure 10(a) is a cross-sectional view showing a rehabilitated pipe model for pipe manufacturing for an existing pipe having a different cross-sectional section consisting of an axial bend. Figure 10(b) is a graph of the rehabilitation diameter against the position in the pipe axis direction for each rehabilitated pipe model for the existing pipe in Figure 10(a). [Figure 11] Figure 11 shows a seventh embodiment of the present invention, and Figure 11(a) is a cross-sectional view showing a rehabilitated pipe model for pipe manufacturing for an existing pipe having a cross-sectional section consisting of a partially large-diameter pipe section. Figure 11(b) is a graph of the rehabilitation diameter against the position in the pipe axis direction for each rehabilitated pipe model for the existing pipe in Figure 11(a). [Figure 12] Figure 12 shows an eighth embodiment of the present invention, where Figure 12(a) is a cross-sectional view showing a rehabilitated pipe model for pipe manufacturing for an existing pipe having a large-diameter normal cross-section and a small-diameter different cross-section. Figure 12(b) is a graph of the rehabilitation diameter against the position in the pipe axis direction for each rehabilitated pipe model for the existing pipe in Figure 12(a). [Modes for carrying out the invention]

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. <First Embodiment (Figures 1-5)> Figure 1(a) shows how an existing pipe 1, such as an aging sewer pipe, is rehabilitated using a self-propelled pipe manufacturing device 10. The existing pipe 1 is composed of, for example, multiple pipe bodies 1p arranged in a line from manhole 4 to manhole 4B. The existing pipes subject to rehabilitation 1 are not limited to sewer pipes; they may also include water supply pipes, agricultural water pipes, hydroelectric power generation water conduits, gas pipes, tunnels, etc.

[0023] The existing pipe 1 has a normal cross-section 1c and a different cross-section 1d. Figures 1(a) and 2(a) As shown in the diagram, the conduit 1a (internal space of the conduit) in the normal cross-sectional section 1c is formed in a uniform cross-sectional shape such as a circular cross-section with a constant diameter D1. The conduit axis L1 in the normal cross-sectional section 1c preferably extends in a straight line.

[0024] As shown in Figures 1(a) and 2(b), in the existing pipe 1, two adjacent pipe bodies 1p are misaligned, forming a different cross-sectional area 1d consisting of an axially misaligned section 1da. A step 1dd is formed in the axially misaligned section 1da. The axially misaligned section 1da also constitutes a different cross-sectional area consisting of a stepped section. As shown in Figure 1(a), in the axially misaligned section 1da, the pipe axis L1 is discontinuous or non-linear with respect to the normal cross-sectional area 1c. Furthermore, as shown in Figure 2(b), the pipe cross-sectional area in the axially misaligned section 1da is smaller than that of the normal cross-sectional area 1c.

[0025] As shown in Figure 1(b), a spiral-shaped rehabilitation pipe 3 is lined to the inner circumference of the existing pipe 1. The pipe diameter of the rehabilitation pipe 3 within the normal cross-section 1c (hereinafter referred to as "rehabilitation diameter") is a constant diameter D3, except for the portions 1ab near the misalignment on both sides of the misalignment portion 1da (different cross-section). The rehabilitation diameter of the rehabilitation pipe 3 within the portions 1ab near the misalignment decreases as it approaches the misalignment portion 1da. The rehabilitation diameter of the rehabilitation pipe 3 within the misalignment portion 1da and the portion immediately adjacent to it is a constant diameter D3, which is smaller than the rehabilitation diameter D3 within the normal cross-section 1c. 3d (D3>D 3d ).

[0026] The gap 2 between the existing pipe 1 and the rehabilitated pipe 3 is filled with a backfill material 5 such as mortar. The existing pipe 1 and the rehabilitated pipe 3 are structurally integrated via the backfill material 5, thereby forming a composite pipe. Alternatively, the rehabilitated pipe 3 may constitute a self-supporting pipe that exhibits the required strength on its own.

[0027] The rehabilitated pipe 3 is manufactured from a long, irregularly shaped strip member 3a (profile) made of synthetic resin such as polyvinyl chloride. The pipe manufacturing device 10 winds the strip member 3a in a spiral shape, and opposing edges of the strip member 3a that are one full turn apart are joined together by a recessed-protrusion fitting mechanism.

[0028] As shown in Figure 1(a), a self-propelled pipe-making device 10 is positioned at the pipe-making end 3e on the extended forward side (right side in Figure 1(a)) of the rehabilitated pipe 3 during pipe-making. As shown in Figure 3, the self-propelled pipe-making device 10 in this embodiment is a small pipe-making device with a non-internal-circumference structure that does not have an internal-circumference restricting body such as a link roller that restricts the pipe-making end 3e from the inner circumference side. The pipe-making end 3e other than the part where the pipe-making device 10 is positioned is open to the inner circumference side (inward in the pipe diameter direction).

[0029] As shown in Figure 3, the pipe-making apparatus 10 comprises a frame-shaped or housing-shaped apparatus body 11, a drive unit 12, a pipe end guide 13, a brake mechanism 14 (expansion / contraction mechanism), and an outer circumference regulating strip 15. The apparatus body 11 is mounted on the inner circumference of the pipe-making end 3e so as to be movable in the spiral winding direction. The length dimension of the apparatus body 11 along the spiral winding direction is about a fraction to a tens of percent of the circumference of the rehabilitated pipe 3. A pipe end guide 13 is provided at the bottom of the device body 11 facing the outer circumference of the pipe. The pipe end guide 13 is slidably engaged with the pipe end 3e in the spiral winding direction.

[0030] A drive unit 12 is provided approximately in the center of the main body 11 of the device. The drive unit 12 includes at least one pair of drive rollers 12a and a drive motor 12c. The unfinished trailing strip portion 3ab of the strip-shaped member 3a is introduced from the manhole 4 through the inside of the finished pipe portion of the rehabilitated pipe 3 and between the pair of drive rollers 12a of the pipe-making device 10. Driven by the drive motor 12c, the drive rollers 12a are pushed diagonally toward the rearward side (right side in Figure 3) and fed to the pipe-making end 3e, where the opposing edges of the trailing strip portion 3ab and the pipe-making end 3e are fitted together. As a result, the trailing strip portion 3ab is incorporated into the rehabilitated pipe 3, the rehabilitated pipe 3 is extended, and the pipe-making device 10 is propelled in the spiral winding direction along the inner circumference of the existing pipe 1. As shown in Figure 1(a), the position in the axial direction of the pipe-making apparatus 10 and the pipe-making end 3e during pipe-making is referred to as the "pipe-making position 10p".

[0031] As shown in Figure 3, a brake mechanism 14 is provided at the end of the main body of the device 11, for example, on the forward side (left side in Figure 3). When the brake shoe 14a of the brake mechanism 14 is pressed against the pipe-making end 3e, a braking force (frictional force) acts on the propulsion of the pipe-making device 10. This braking force makes the amount of propulsion of the pipe-making device 10 smaller than the amount of feed of the trailing belt section 3ab by the drive roller 12a, thereby enabling the rehabilitated pipe 3 to be manufactured with an enlarged diameter. Furthermore, this type of strip-shaped member 3a (profile) for rehabilitating existing pipes tends to shrink in diameter as it is formed into a spiral tube (see Patent Document 3, etc.), and when the braking force is released or weakened, the rehabilitated pipe 3 is formed with a reduced diameter.

[0032] An outer circumference regulating strip 15 is wrapped around the outer circumference of the pipe end 3e along the spiral winding direction. The outer circumference regulating strip 15 is made of metal wire, but is not limited to this and may be made of a chain or the like. Both ends 15e and 15f of the outer circumference regulating strip 15 are connected to the main body 11 of the device. By adjusting the length of the portion of the outer circumference regulating strip 15 wrapped around the pipe end 3e (hereinafter referred to as the "wrapping length"), the circumference of the pipe end 3e and thus the pipe diameter can be regulated from the outer circumference. One end 15f of the outer circumference regulating strip 15 is biased by a spring 15s in a direction that reduces the wrapping length.

[0033] As shown in the flowchart in Figure 4, in this invention, the following preliminary steps are performed prior to the actual rehabilitation work. <Standard design rehabilitation diameter calculation process> As shown in Figure 5(a), the normal design rehabilitation diameter D3 of the rehabilitation pipe 3 is determined based on the existing pipe diameter D1 of the normal cross section 1c (step 101). The normal design rehabilitation diameter D3 is preferably set to about 0.8 to 1.0 times the existing pipe diameter D1.

[0034] <Calculation process for the most significant design correction diameter> Furthermore, the most varied design rehabilitation diameter D is the diameter at which the rehabilitation pipe 3 undergoes the greatest change in diameter according to the different cross-sectional section 1d. 3dis determined (step 102). Specifically, as shown in Fig. 2(b), the maximum varying designed rehabilitation diameter (outer diameter) is the inscribed circle C at the misaligned portion 1da of the existing pipe 1 1da has a diameter D 1da is preferably set to about 0.8 to 1.0 times the diameter D of the inscribed circle C 1da of the inscribed circle C 1da is normally smaller than the existing pipe diameter D1 of the normal cross-section 1c (D 1da <D1). Therefore, the maximum varying designed rehabilitation diameter D 3d is smaller than the normal designed rehabilitation diameter D3 (D 3d <D3).

[0035] <Design diameter change distance calculation step> Next, as shown in Fig. 5(a), the designed diameter change distance L in the diameter reduction direction for changing the diameter of the rehabilitated pipe 3 from the normal designed rehabilitation diameter D3 to the maximum varying designed rehabilitation diameter D 3d and the designed diameter change distance L in the diameter expansion direction for changing the diameter from the maximum varying designed rehabilitation diameter D rd and the maximum varying designed rehabilitation diameter D 3d to the normal designed rehabilitation diameter D3 are calculated (step 103). ep are calculated (step 103).

[0036] The designed diameter change distance L in the diameter reduction direction rd can be calculated by the following formula. L rd =Δd / d rd (1) Here, Δd is the diameter difference between the normal designed rehabilitation diameter D3 and the maximum varying designed rehabilitation diameter D 3d (Δd=D3-D 3d ). d rd is the designed unit diameter reduction amount when the rehabilitated pipe 3 is reduced in diameter by a unit axial length (for example, 1 meter). The designed unit diameter reduction amount d rd can be calculated from the aforementioned analysis data of diameter reduction characteristics of the band-shaped member 3a and known implementation data. Preferably, by calculating the designed unit diameter reduction amount d rd to be a relatively small value, the designed diameter change distance L in the diameter reduction direction rd is set to a relatively large value. By adding a certain margin value α1 to the calculated value according to formula (1), the designed diameter change distance L in the diameter reduction direction rd is obtained according to formula (1 The value may be set to a larger value than the calculated value. Design diameter change distance L in the diameter reduction direction rd For example, this ranges from approximately 300mm to 3000mm.

[0037] Design diameter change distance L in the diameter expansion direction ep It can be calculated using the following formula. L ep =Δd / d ep (2) Here, d ep This is the design unit diameter expansion amount when the rehabilitated pipe 3 is manufactured with an expanded diameter by a unit axial length (e.g., 1 meter). Design unit diameter expansion amount d ep This can be calculated from the diameter expansion capacity due to the braking force of the brake mechanism 14. Preferably, the design unit diameter expansion amount d ep By calculating a smaller value, the design diameter change distance L in the diameter expansion direction can be calculated. ep Set it to a larger value. By adding a margin value α2 to the value calculated by equation (2), the design diameter change distance L in the diameter expansion direction can be calculated. ep You may set the value to be larger than the value calculated by equation (2). Design diameter change distance L in the diameter expansion direction ep For example, this ranges from approximately 300mm to 3000mm.

[0038] <Calculation process for the start and end points of design diameter change> Next, the position of the different cross-sectional section 1d in the pipe axis direction and the design diameter change distance L are determined. rd ,L ep Based on this, the design diameter change start and end point AP, where the diameter change in the pipe axis direction begins or ends, is determined (step 104). Specifically, the design diameter change distance L in the diameter reduction direction is determined from the axial misalignment portion 1da toward the starting side in the pipe axis direction (left side in Figure 5). rd A position separated by a certain distance is defined as the design diameter reduction start point AP1 at the design diameter change start / end point AP. Furthermore, the design diameter change distance L in the diameter expansion direction is defined from the misaligned portion 1da toward the receiving side in the pipe axis direction (right side in Figure 5). ep A point separated by a certain distance is defined as AP2, the end point of the design diameter expansion at the start / end point AP of the design diameter change.

[0039] <Creating a rehabilitation manager model> As shown by the thick solid line in Figure 5(b), the set values ​​D3 and D obtained in this way are shown. 3d ,L rd ,L ep A pipe rehabilitation model 3M for pipe manufacturing is created from AP1 and AP2 (step 105). In the pipe rehabilitation model 3M for pipe manufacturing, a normal diameter pipe section 3b with a normal design rehabilitation diameter D3 is set on the starting side (left side in the figure) of the design diameter reduction start point AP1 and on the reaching side (right side in the figure) of the design diameter expansion end point AP2. From the design diameter reduction start point AP1 to the misaligned section 1da, a diameter change pipe section 3c1 is set that is reduced in diameter at a constant gradient toward the misaligned section 1da. The maximum change in design rehabilitation diameter D is set at the misaligned section 1da. 3d The most variable pipe section 3d is set. From the misaligned section 1da to the design diameter expansion end point AP2, a diameter-changing pipe section 3c2 is set that expands at a constant gradient toward the design diameter expansion end point AP2. Therefore, the rehabilitation diameter is locally minimized at the misaligned section 1da. Using the rehabilitation pipe model 3M for pipe manufacturing created in this way, an actual construction plan for the rehabilitation pipe 3 can be made.

[0040] Furthermore, as shown by the thin solid line in Figure 5(b), a structural design rehabilitation pipe model 3Ma is created based on the pipe rehabilitation pipe model 3M for pipe manufacturing. In the structural design rehabilitation pipe model 3Ma, preferably, the rehabilitation diameter over the entire area in the pipe axis direction is the most changed design rehabilitation diameter D 3d It is set to this. The structural design of the rehabilitated pipe is performed using the created structural design model 3Ma. This allows the rehabilitated pipe to be designed on the safe side in terms of structural calculations, and enables accurate selection of strip members 3a, etc., to ensure the required strength of the rehabilitated pipe. Alternatively, the rehabilitated pipe and the existing pipe may be integrated via backfill material to form a composite pipe, and the structural design may take into account the remaining strength of the existing pipe. Alternatively, the rehabilitated pipe may be designed as a self-supporting pipe that exhibits the required strength on its own.

[0041] Furthermore, as shown by the dashed line in Figure 5(b), a flow rate design rehabilitation pipe model 3Mb is created based on the rehabilitation pipe model 3M. In the flow rate design rehabilitation pipe model 3Mb, preferably, the portion from the design diameter reduction start point AP1 to the design diameter expansion end point AP2 is the most changed design rehabilitation diameter D 3d This is the setting. In addition, the normal diameter pipe sections 3b on both sides in the pipe axis direction are set to the normal design rehabilitation diameter D3. The flow rate design for the rehabilitated pipe is performed using the 3Mb model for flow rate design. This allows for a design that is on the safe side in flow rate calculations, enabling the setting of appropriate allowable flow rates and verification that the required flow rates are met.

[0042] <Actual rehabilitation construction process> Subsequently, as shown in Figure 1(a), the actual construction of the rehabilitated pipe 3 is carried out according to the construction plan. Until the pipe manufacturing position 10p reaches the design diameter reduction start point AP1, the pipe manufacturing device 10 manufactures the rehabilitated pipe 3 to a rehabilitation diameter of approximately the design rehabilitation diameter D3. The brake mechanism 14 is used to apply a brake to prevent the rehabilitated pipe 3 from being manufactured with reduced diameter. In addition, the length of the outer circumference regulating strip 15 is adjusted so that the outer circumference regulating strip 15 adheres to the outer circumference of the pipe end 3e. The length of the strip at this time is L. 15 L 15 It is approximately π·D3.

[0043] Furthermore, the braking force of the braking mechanism 14 against the propulsion of the self-propelled pipe-making device 10 is adjusted using the design diameter change start / end point AP as an indicator. Specifically, when the pipe-making position 10p reaches the vicinity of the design diameter reduction start point AP1, the brake by the braking mechanism 14 is released. As a result, as the pipe-making of the rehabilitated pipe 3 progresses, the rehabilitation diameter, i.e., the pipe diameter at the pipe-making end 3e is reduced due to the diameter reduction characteristic. Along with the diameter reduction, the outer circumference regulating strip 15 loosens. Preferably, the design diameter change distance L in the diameter reduction direction. rd By setting it to a larger value, the most changed design rehabilitation diameter D will be reached before the pipe manufacturing position 10p reaches the misaligned portion 1da. 3d It is possible to reliably achieve a certain pipe diameter. Furthermore, the pipe diameter at the misaligned section 1da is the design rehabilitation diameter D, which is the diameter at which the pipe diameter changes the most. 3dIt is sufficient if the pipe manufacturing position 10p has passed the design diameter reduction start point AP1, after which the brake may be released and diameter reduction pipe manufacturing may begin.

[0044] The most varied pipe diameter during manufacturing is the design rehabilitation diameter D. 3d When this is reached, the length of the outer circumference restricting strip 15 is shortened so that the outer circumference restricting strip 15 adheres again to the outer circumference of the pipe end 3e. Furthermore, the brake mechanism 14 is applied to prevent the rehabilitated pipe 3 from being further reduced in diameter during manufacturing. This reduces the pipe diameter to the minimum change design rehabilitation diameter D. 3d The pipe can be held in place to a certain extent, and the pipe-making end 3e and the pipe-making device 10 can pass through the misaligned section 1da without getting caught on the step 1dd of the misaligned section 1da. Therefore, the pipe-making of the rehabilitated pipe 3 in the misaligned section 1da can be carried out smoothly.

[0045] After the pipe manufacturing position 10p passes the misaligned portion 1da, the restraint on the end portion 15e of the outer peripheral regulating strip 15 is released. Furthermore, the braking force of the braking mechanism 14 is increased to a stronger level than when preventing diameter reduction. As a result, as the pipe manufacturing of the rehabilitated pipe 3 progresses, the pipe diameter changes to the maximum design rehabilitation diameter D. 3d The diameter is expanded to the normal design rehabilitation diameter D3. As the diameter expands, the length of the outer circumference regulating strip 15 increases. Therefore, the degree of diameter expansion or the manufactured pipe diameter can be determined by the length of the outer circumference regulating strip 15.

[0046] Preferably, the design diameter change distance L in the diameter expansion direction. ep By setting this value to a larger value, the pipe diameter can be returned to approximately the normal design rehabilitation diameter D3 before the pipe manufacturing position 10p reaches the design diameter expansion end point AP2. The design diameter change distance L in the diameter expansion direction. epBy applying a braking force stronger than the braking force set in the calculation process, it is possible to ensure that the pipe diameter returns to approximately the normal design rehabilitation diameter D3 before the pipe manufacturing position 10p reaches the design diameter expansion end point AP2. For example, as shown in Figure 3, the braking force may be increased by adding one or more additional brake units 16. The additional brake unit 16 is mounted on the outer circumference regulating strip 15, away from the main body of the device 11, and engages with the pipe end 3e to apply the braking force. Furthermore, the starting position for diameter expansion is not limited to the position immediately after passing the misaligned section 1da; it may also be started at a position slightly further forward from the misaligned section 1da (to the right in Figure 5(a)). The diameter of the pipe at the design diameter expansion end point AP2 should be approximately the design rehabilitation diameter D3.

[0047] After the pipe diameter returns to approximately the normal design rehabilitation diameter D3, the length of the loop is fixed by restraining the end 15e of the outer circumference restricting strip 15. The length of the loop at this time is L. 15 L 15 The result is approximately π·D3. Furthermore, the braking force from the braking mechanism 14 is reduced to the level required to prevent diameter reduction during pipe manufacturing. This allows the rehabilitated pipe 3 to be manufactured with a constant diameter, typically around the design rehabilitated diameter D3.

[0048] In this way, the rehabilitated pipe 3 can be manufactured while expanding or contracting the rehabilitation diameter to match the different cross-sectional sections 1d, such as the normal cross-sectional section 1c and the misaligned section 1da, of the existing pipe 1. That is, the rehabilitation diameter D of the entire length of the rehabilitated pipe 3 is adjusted to match the misaligned section 1da. 3d Instead of doing that, for most of the normal cross section 1c, the rehabilitation diameter D3 (>D) is adjusted to match the normal cross section 1c. 3d This can be reduced to a certain extent. Therefore, the gap 2 between pipes, especially in the normal cross-sectional section 1c of the existing pipe 1, can be narrowed.

[0049] As shown in Figure 1, after the rehabilitation pipe 3 is manufactured, backfill material 5 is filled into the gap 2 between the pipes. Since the gap 2 between the pipes in the normal cross section 1c can be narrowed, the amount of backfill material 5 required can be reduced. Therefore, construction costs can be reduced and economic efficiency can be improved. Subsequently, as the backfill material 5 hardens, the existing pipe 1 and the rehabilitated pipe 3 are structurally integrated via the backfill material 5. In this way, the existing pipe 1 can be rehabilitated.

[0050] Next, other embodiments of the present invention will be described. In the following embodiments, components that overlap with those described above are denoted by the same reference numerals in the drawings and their descriptions are omitted. <Second Embodiment (Another form of pipe-making apparatus, Figure 6)> As shown in Figure 6, in the second embodiment, the rehabilitated pipe 3 is manufactured by an internal circumference regulating self-propelled pipe manufacturing device 10B. The pipe manufacturing device 10B comprises a device body 11, a drive unit 12 mounted on the device body 11, and an internal circumference regulating body 20 (link roller). The internal circumference regulating body 20 is formed in a spiral ring shape including a plurality of links 21 and rollers 22. Both ends of the internal circumference regulating body 20 are connected to the device body 11.

[0051] An expansion / contraction mechanism 23 is provided at a circumferential position on the inner circumference regulating body 20, away from the main body 11 of the device. The expansion / contraction mechanism 23 includes, for example, a turnbuckle 23a and is expandable and contractible. By adjusting the amount of expansion or contraction of the expansion / contraction mechanism 23, the circumference or diameter of the inner circumference regulating body 20 is expanded or contracted.

[0052] The pipe end 3e of the rehabilitated pipe 3, which is being manufactured, is wrapped around the outer circumference of the inner circumference restricting body 20. In this way, the pipe end 3e is restricted from the inner circumference side.

[0053] In the second embodiment, prior to the actual rehabilitation work, the design diameter change distance L rd ,L ep The process of calculating the design diameter change start and end points AP1 and AP2, and then performing structural and flow rate calculations is the same as in the first embodiment (Figure 4).

[0054] In actual rehabilitation work using the pipe-making device 10B, the expansion / contraction mechanism 23 of the inner circumference regulating body 20 is adjusted using the design diameter change start / end point AP as an indicator. Specifically, until the pipe-making position 10p where the pipe-making device 10B and the pipe-making end 3e are located reaches the design diameter reduction start point AP1, the circumference of the inner circumference regulating body 20 is adjusted to be approximately π / D3, which is the normal design rehabilitation diameter. During pipe-making, the pipe-making end 3e of the rehabilitation pipe 3 adheres to the inner circumference regulating body 20 due to the diameter reduction characteristics. This allows the rehabilitation pipe 3 to be manufactured so that its diameter is approximately the normal design rehabilitation diameter D3.

[0055] After the pipe manufacturing position 10p reaches the vicinity of the design diameter reduction starting point AP1, the expansion / contraction mechanism 23 is contracted to reduce the circumference of the inner circumference regulating body 20 to the maximum change of the design rehabilitation diameter by a factor of pi (π·D). 3d The circumference is reduced to approximately π·D3 with a single operation of the expansion / contraction mechanism 23, from approximately π·D3 to 3d It may be shrunk to about π·D while manufacturing the pipe, and the circumference of the inner circumference restrictor 20 may be changed to the maximum design rehabilitation diameter multiplied by pi (π·D). 3d It may be contracted to the extent of )

[0056] This releases or eases the restriction on the pipe end 3e by the inner circumference restrictor 20. As a result, as the pipe manufacturing of the rehabilitated pipe 3 progresses, the pipe diameter of the pipe end 3e is reduced due to the diameter reduction characteristic. By the time the pipe manufacturing position 10p reaches the misaligned portion 1da, the pipe diameter has changed to the design rehabilitation diameter D. 3d It will be approximately this much. Design diameter change distance L in the diameter reduction direction. rd By setting it to a larger value, the pipe diameter changes to the most significant design rehabilitation diameter D before the pipe manufacturing position 10p reaches the misaligned portion 1da. 3d This ensures that it reaches a certain size. As a result, the pipe end 3e adheres to the inner circumference restrictor 20 again. Preferably, the worker confirms that the pipe end 3e is adhered to the inner circumference restrictor 20.

[0057] Furthermore, pipe manufacturing will continue. This will allow the pipe diameter to change to the most varied design rehabilitation diameter D. 3dBy maintaining this position, the pipe-making device 10B and, consequently, the pipe-making position 10p can pass through the misaligned section 1da, and the rehabilitated pipe 3 can be smoothly manufactured in the misaligned section 1da.

[0058] After the pipe manufacturing position 10p passes the misaligned portion 1da, the expansion / contraction mechanism 23 is gradually extended to gradually increase the circumference of the inner circumference regulation value 20. The extension operation of the expansion / contraction mechanism 23 generates tension at the pipe end 3e via the inner circumference regulation body 20, or increases the tension applied to the pipe end 3e. As a result, the pipe diameter expands as pipe manufacturing progresses. This causes the pipe diameter to return to approximately the normal design rehabilitation diameter D3 before the pipe manufacturing position 10p preferably reaches the design diameter expansion end point AP2. The operator confirms that the pipe diameter has returned to approximately the normal design rehabilitation diameter D3 and then stops the gradual extension operation of the expansion / contraction mechanism 23.

[0059] <Third embodiment (another form of the different cross-sectional area, Figure 7)> The cross-sectional portion 1d in the existing pipe to be rehabilitated according to the present invention is not limited to the axially misaligned portion 1da. In the existing pipe 1B shown in Figure 7(a), a section with a different cross-section, specifically a small-diameter pipe section 1db (section with a different inner diameter), is formed.

[0060] As shown in Figure 7(b), in the pipe rehabilitation pipe model 3M of the third embodiment, the maximum change design rehabilitation diameter D is applied to the entire area within the small diameter pipe section 1 dB. 3d The most changed pipe section 3d is set. The most changed design rehabilitation diameter D 3d This is calculated from the inner diameter of the small diameter pipe section at 1 dB. The design diameter change distance L is calculated from the starting side (left side in Figure 7(b)) of the small diameter pipe section at 1 dB. rd The diameter change section 3c1 is defined as the section from the design diameter reduction starting point AP1, which is separated by a distance of 1 dB, to the small diameter pipe section 1 dB. The design diameter change distance L is from the receiving end of the small diameter pipe section 1 dB (the right end in Figure 7(b)). ep The diameter change section 3c2 extends only to the design diameter reduction start point AP2, which is located on the receiving side (right side in Figure 7(b)). Furthermore, in the flow rate design rehabilitation pipe model 3Mc, the rehabilitation diameter in the section from the design diameter reduction start point AP1 to the design diameter expansion end point AP2, spanning the small diameter pipe section 1db, is the maximum change in design rehabilitation diameter D 3d It is set to this.

[0061] <Fourth embodiment (another form of the different cross-section, Figure 8)> In the existing pipe 1D shown in Figure 8(a), a projection f is formed on the inner circumferential surface. The projection f is formed, for example, by a part of the existing pipe 1D protruding from the inner circumferential surface. The pipe portion 1df with the projection f in the pipe axis direction of the existing pipe 1 (hereinafter referred to as "projection portion 1df") is a different cross-sectional portion of the pipeline cross-section, different from the normal cross-sectional portion 1c. As shown in Figure 8(b), the rehabilitation pipe models 3M, 3Mb, and 3Mc of the fourth embodiment are substantially equivalent to those of the first embodiment (Figure 5(b)).

[0062] <Fifth Embodiment (Another form of the different cross-sectional area, Figure 9)> In the existing pipe 1E shown in Figure 9(a), foreign objects x, such as pipes, are provided along the inner circumference. The pipe portion 1de (hereinafter referred to as "foreign object portion 1de") in the pipe axis direction of the existing pipe 1 has a different cross-sectional shape from the normal cross-sectional portion 1c. As shown in Figure 9(b), the rehabilitation pipe models 3M, 3Mb, and 3Mc of the fifth embodiment are substantially equivalent to those of the first embodiment (Figure 5(b)).

[0063] <Sixth embodiment (another form of the different cross-sectional area, Figure 10)> In the existing pipe 1F shown in Figure 10(a), a bent section 1dc is formed where the pipe axis is bent. The bent section 1dc constitutes a section with different cross-sections, where the orientation of the cross-section perpendicular to the pipe axis changes along the pipe axis.

[0064] As shown in Figure 10(b), the rehabilitated pipe models 3M, 3Mb, and 3Mc of the sixth embodiment are substantially equivalent to those of the first embodiment (Figure 5(b)). For example, in the rehabilitated pipe model 3M for pipe manufacturing, the maximum change design rehabilitation diameter D is located in the center of the axial bend 1dc. 3dThe most variable diameter pipe section 3d is set. On both sides of it, via diameter-changing pipe sections 3c1 and 3c2, the normal diameter pipe section 3b with the normal design rehabilitation diameter D3 is set.

[0065] <Seventh Embodiment (Another form of the different cross-sectional area, Figure 11)> In the existing pipe 1G shown in Figure 11(a), a large-diameter pipe section 1dg is partially formed. The large-diameter pipe section 1dg constitutes a cross-sectional section with a different inner diameter, which differs from the normal cross-sectional section 1c.

[0066] As shown in Figure 11(b), in the pipe rehabilitation pipe model 3M of the seventh embodiment, the design diameter expansion end point AP2 is set at the starting side (left side in the figure) within the large diameter pipe section 1dg. The design diameter reduction start point AP1 is set at the reaching side (right side in the figure) within the large diameter pipe section 1dg. The most changed pipe section 3d is set between these design diameter change start and end points AP2 and AP1. The most changed design rehabilitation diameter D of the most changed pipe section 3d 3d The diameter is larger than the rehabilitation diameter D3 in the normal cross section 1c (D 3d >D3). Diameter-changing pipe sections 3c are set on both sides in the axial direction within the large-diameter pipe section 1dg.

[0067] <Eighth embodiment (another form of the different cross-section, Figure 12)> In the existing pipe 1H shown in Figure 12(a), a large-diameter normal cross-section 1c is included on the launching side (left side in Figure 12), and a small-diameter different cross-section 1dh is included on the receiving side (right side in Figure 12).

[0068] As shown in Figure 12(b), in the pipe rehabilitation pipe model 3M of the eighth embodiment, the design diameter change distance L is located on the starting side (left side in Figure 12) of the step difference 1dd between the normal cross section 1c and the different cross section 1dh. rd The design diameter reduction start point AP1 (design diameter change start and end point) is set at a distance of [number] units. The diameter change pipe section 3c1 is set from the design diameter reduction start point AP1 to the step 1dd. The rehabilitation diameter throughout the entire area within the different cross-sectional section 1dh is the maximum change design rehabilitation diameter D 3d It is set to this. In the flow rate design rehabilitation pipe model 3Mc of the eighth embodiment, the portion from the design diameter reduction start point AP1 to the receiving side (right side in Figure 12) has a constant maximum change design rehabilitation diameter D 3d It is set to this.

[0069] The present invention is not limited to the embodiments described above, and various modifications can be made without departing from its spirit. For example, the pipe-making apparatus may be self-propelled and is not limited to the pipe-making apparatuses 10 and 10B disclosed in the embodiments. The different cross-sectional sections of the existing pipe are not limited to the different cross-sectional sections 1da to 1dh of the embodiment. In the eighth embodiment (Figure 12), the normal cross-sectional section 1c on the departure side may have a small diameter, and the different cross-sectional section 1dh on the arrival side may have a large diameter. In this case, the design diameter change distance L is greater than the step 1dd on the arrival side. ep The design diameter expansion end point AP2 (design diameter change start and end point) is set at a distance of [number] units. In addition to or instead of the design diameter reduction start point AP1, a design diameter reduction end point may be set as the start and end point of the design diameter change. As the start and end points of the design diameter change, a design diameter expansion start point may be set in place of, or in addition to, the design diameter expansion end point AP2. [Industrial applicability]

[0070] This invention can be applied, for example, to the rehabilitation technology of aging sewer pipes. [Explanation of Symbols]

[0071] 1 Existing pipe 1B~1H Existing pipes 1a Pipe line (pipe space) 1c Normal cross section 1d Different cross section 1da Axial misalignment section (different cross-section section, stepped section) 1dd step 1db small diameter pipe section (different cross section, different inner diameter) 1dc axial bend (different cross-section) 1dd step 1de Foreign matter attached part (different cross-section part) 1df Projected part (different cross section) 1dg large diameter pipe section (different cross section) 1dh Small diameter section with different cross-section f protrusion x foreign object 3 Rehabilitation pipe 3a Strip-shaped member 3ab Unfinished pipe trailing section 3b Normal diameter pipe section 3c Diameter change tube section 3c1 Diameter change section in the diameter reduction direction 3c2 Diameter change pipe section in the diameter expansion direction 3D most modified pipe section 3e Pipe end 3M pipe rehabilitation pipe model 3Ma Rehabilitation Pipe Model for Structural Design 3Mb Rehabilitation pipe model for flow rate design 10. Non-internal circumference self-propelled pipe-making machine 10B Self-propelled pipe-making machine with internal circumference regulation 10p Pipe manufacturing position 11. Main unit of the device 12 Drive unit 14. Brake mechanism (expansion / contraction mechanism) 15 Perimeter Regulation Barrier 16. Additional brake unit (brake mechanism) 20. Inner circumference regulating body (link roller) 23. Expand / Contract Mechanism AP design diameter change start and end points AP1 design diameter reduction start point AP2 design widening end point D3 Standard Design Rehabilitation Diameter D 3d Most Change Design Rehabilitation Diameter L rd Design diameter change distance in the diameter reduction direction L ep Design diameter change distance in the diameter expansion direction

Claims

1. A method for rehabilitating an existing pipe, comprising manufacturing a spiral-shaped rehabilitated pipe by winding a long strip-shaped member in a spiral manner, using a pipe-making device that moves along the inner circumference of an existing pipe having a normal cross-section and a cross-section of a different cross-section, A step of determining the normal design rehabilitation diameter of the rehabilitation pipe based on the existing pipe diameter of the normal cross section, A step of determining the most varied design rehabilitation diameter in which the rehabilitation pipe undergoes the greatest diameter change according to the different cross-sectional portion, A step of determining the design diameter change distance for changing the diameter of the rehabilitation pipe from the normal design rehabilitation diameter to the most varied design rehabilitation diameter, or from the most varied design rehabilitation diameter to the normal design rehabilitation diameter, A step of determining the start and end points of the design diameter change, where the diameter change in the axial direction of the pipe, based on the position of the different cross-sectional portion in the pipe axis direction and the design diameter change distance, A method for rehabilitating existing pipes, characterized by performing the above step prior to the actual pipe manufacturing.

2. The aforementioned maximum design rehabilitation diameter is smaller than the aforementioned normal design rehabilitation diameter. The starting point for design diameter reduction at the design diameter change start point is defined as a position located away from the different cross-sectional area toward the starting side in the pipe axis direction by the distance of the design diameter change in the diameter reduction direction required to reduce the diameter of the rehabilitated pipe from the normal design rehabilitation diameter to the maximum change design rehabilitation diameter. The method for rehabilitating an existing pipe according to claim 1, wherein the design diameter end point at the design diameter change start and end point is set at a position located away from the different cross-sectional area toward the destination side in the pipe axis direction by the distance of the design diameter change in the diameter expansion direction required to expand the rehabilitated pipe from the most changed design rehabilitation diameter to the normal design rehabilitation diameter.

3. The method for rehabilitating an existing pipe according to claim 2, wherein the flow rate of the rehabilitated pipe is designed using a rehabilitated pipe model for flow rate design, wherein the entire area of ​​the diameter-changing pipe portion from the design diameter reduction starting point to the design diameter expansion ending point is defined as the maximum change design rehabilitation diameter, and the normal diameter pipe portions on both sides of the diameter-changing pipe portion in the pipe axis direction are defined as the normal design rehabilitation diameter.

4. The method for rehabilitating an existing pipe according to claim 2, wherein the structural design of the rehabilitated pipe is performed using a rehabilitated pipe model for structural design in which the entire area in the axial direction of the pipe is defined as the most varied design rehabilitation diameter.

5. The method for rehabilitating an existing pipe according to any one of claims 1 to 4, wherein the different cross-sectional portion is a misaligned portion, a stepped portion, a protruding portion, a portion with foreign matter, a portion with a different inner diameter, or a bent portion of the existing pipe.

6. A method for rehabilitating an existing pipe according to any one of claims 1 to 4, wherein the pipe is manufactured by a self-propelled pipe-making device that does not restrict the inner circumference and has a braking mechanism, and the braking force applied by the braking mechanism to the propulsion of the self-propelled pipe-making device is adjusted using the start and end points of the design diameter change as an indicator.

7. A method for rehabilitating an existing pipe according to any one of claims 1 to 4, wherein the pipe is manufactured using an internal circumference regulating self-propelled pipe manufacturing device having an internal circumference regulating body in the shape of a spiral ring, and the expansion and contraction mechanism provided on the internal circumference regulating body is adjusted using the start and end points of the design diameter change as indicators.

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