Renovation pipe manufacturing method

Abstract

To facilitate adjustment of the alignment of a renovation pipe with respect to an existing pipe when manufacturing a helical-shaped renovation pipe along an inner peripheral surface of the existing pipe.SOLUTION: A pipe manufacturing method finds a mark position MP on a normal spiral trajectory R0 with an axis along a pipe axis 1c of an existing pipe 1 as a spiral axis C0. The normal spiral trajectory R0 is defined by an effective width W10 of a strip-shaped member 10 that becomes a renovation pipe 9 and a pipe diameter φ9. A track mark M is placed at a found mark position MP. Using the track mark M as an index, a winding direction of the renovation pipe 9 is aligned with the normal spiral track R0.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for producing a helical rehabilitating pipe along the inner surface of an existing pipe, and in particular to a method for producing a helical rehabilitating pipe that is suitable for a so-called self-propelled pipe producing machine that is propelled (self-propelled) in a helical manner as the pipe is produced. [Background technology]

[0002] A method for rehabilitating an existing pipe, such as an aging sewer pipe, by lining the inner periphery of the existing pipe with a rehabilitation pipe is known (see Patent Documents 1 and 2, etc.). The rehabilitation pipe is, for example, a spiral pipe made from a long strip-shaped member (profile) made of synthetic resin. As the pipe making machine, for example, a so-called self-propelled pipe making machine is used, which is propelled (self-propelled) in a spiral shape along the inner periphery of the existing pipe. A spiral-shaped rehabilitation pipe is sequentially formed behind the pipe making machine along the trajectory of the pipe making machine.

[0003] Patent Document 1 discloses a method for unwinding a helical rehabilitating pipe prior to pipe production by a pipe production machine. Specifically, a winding ring (the end of the rehabilitating pipe at the start of pipe production) is made of a strip-shaped member and incorporated into the pipe production machine. Patent Document 2 discloses a method for manufacturing a rehabilitating pipe in the shape of a spiral pipe at a curved portion of an existing pipe, in accordance with the curve of the existing pipe. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-166758 [Patent Document 2] Japanese Patent Publication No. 2020-029009 Summary of the Invention [Problem to be solved by the invention]

[0005] When producing a rehabilitating pipe using a self-propelled pipe-making machine, if the winding direction of the rehabilitating pipe deviates from the normal spiral trajectory based on the existing pipe, i.e., if the rehabilitating pipe is not directly aligned with the existing pipe, the pipe-making machine may be pressed too hard against the inner surface of the existing pipe, preventing it from advancing, or the rehabilitating pipe may become too far away from the inner surface of the existing pipe. In a pipe-making process in which the rehabilitating pipe is attached to the inner surface of the existing pipe, insufficient adhesion may occur in one location around the pipe. Therefore, for example, when starting to produce a rehabilitating pipe, it is necessary to orient the unwinding ring directly relative to the existing pipe. Furthermore, after passing through a bend in the existing pipe's axis, the alignment is often lost, and the rehabilitating pipe must be readjusted so that it is directly aligned with the existing pipe. However, the correct spiral trajectory based on the existing pipe does not exist in a visible form, making it difficult to determine whether the rehabilitated pipe is facing directly toward the existing pipe, and it is also difficult to determine how to adjust the orientation of the rehabilitated pipe so that it is facing directly toward the existing pipe. In consideration of the above circumstances, the present invention aims to facilitate the operation of adjusting the actual winding direction of a rehabilitating pipe to follow a normal spiral trajectory based on the existing pipe when manufacturing a helical rehabilitating pipe along the inner surface of an existing pipe, i.e., to facilitate the adjustment of the alignment of the rehabilitating pipe with respect to the existing pipe. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a method for manufacturing a spiral-shaped rehabilitation pipe made of a long strip-shaped member wound spirally along the inner circumferential surface of an existing pipe, comprising: a step of determining the position of a mark on a regular spiral track having a spiral axis that is an axis line along the pipe axis of the existing pipe and a spiral pitch that is determined based on the effective band width of the band-shaped member and the diameter of the pipe to be manufactured; providing a track mark at the mark location; a step of aligning the winding direction of the rehabilitating pipe along the spiral track using the track mark as an index; The present invention is characterized by the following features.

[0007] The effective band width is a width dimension obtained by subtracting the overlap width of the band-shaped member between adjacent winding portions of the rehabilitating pipe from the total width of the band-shaped member. The manufactured pipe diameter corresponds to the pipe diameter (inner diameter or outer diameter) of the rehabilitated pipe. According to this pipe manufacturing method, by using the track marks provided at the mark positions as indicators, it is possible to easily adjust the alignment of the rehabilitating pipe with the existing pipe, and to reliably manufacture the rehabilitating pipe so that it follows the regular spiral track of the existing pipe. This prevents the pipe manufacturing machine from being pressed too hard against the inner surface of the existing pipe, preventing it from being propelled forward, or preventing the rehabilitating pipe from moving too far away from the inner surface of the existing pipe.

[0008] Preferably, a plurality of reference angle positions are set on a reference circle where a cross section perpendicular to the pipe axis at an axial reference position of the existing pipe intersects with the inner circumferential surface, the reference angle positions being spaced apart from each other in a pipe circumferential direction of the existing pipe, The mark positions are determined as positions away from each reference angle position toward the front of the pipe manufacturing along the pipe axis direction of the existing pipe by a distance corresponding to the circumferential arrangement angle of the reference angle position and the spiral pitch. This allows the track marks to be provided at a plurality of angular positions on the regular helical track, thereby ensuring that the winding direction of the rehabilitating pipe is aligned along the regular helical track.

[0009] Preferably, a cross-shaped measuring instrument having an extendable vertical ruler and an extendable horizontal ruler is prepared, one end of the vertical ruler is fixed in position on the inner peripheral surface, and the other end of the vertical ruler is displaced in the pipe circumferential direction so that the vertical ruler is longest when the other end is abutted against the inner peripheral surface at each displacement position, and the other end is displaced in the pipe axial direction of the existing pipe so that the vertical ruler is shortest when the other end is abutted against the inner peripheral surface at each displacement position, and the points at which both ends of the vertical ruler abut against the inner peripheral surface are set as the two reference angle positions in the vertical direction; The horizontal ruler is intersected with the midpoint of the vertical ruler in the vertical reference state, and the horizontal ruler is rotated and displaced around the vertical ruler as the central axis, and when both ends of the horizontal ruler are abutted against the inner circumferential surface at each displacement angle, the points at which the horizontal ruler abuts against the inner circumferential surface in the horizontal reference state where the horizontal ruler is shortest are set as the two horizontal reference angle positions. This allows a cross-shaped measuring instrument to be used to determine a reference circle perpendicular to the axis of the existing pipe, and a total of four reference angle positions can be set on the reference circle. Using these reference angle positions as references, the positions of the marks at the four angles of the regular spiral trajectory can be determined.

[0010] Preferably, the pipe diameter corresponds to the inner diameter of the existing pipe. In this case, the rehabilitating pipe is manufactured so that it is attached to the inner circumferential surface of the existing pipe. In the attaching pipe manufacturing process, the above-mentioned facing adjustment can be performed to prevent insufficient attachment.

[0011] Preferably, the track markings are attached to the inner peripheral surface. The track markings may be attached using chalk, color spray paint, or the like. This makes it easy to attach the track markings. Furthermore, the track markings do not interfere with the pipe making machine or the rehabilitating pipe. [Effects of the Invention]

[0012] According to the present invention, when manufacturing a rehabilitating pipe in the shape of a spiral pipe along the inner peripheral surface of an existing pipe, it is possible to easily adjust the alignment of the rehabilitating pipe with respect to the existing pipe. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a side cross-sectional view showing a starting manhole side portion of an existing pipe being rehabilitated by a rehabilitating pipe manufacturing method according to one embodiment of the present invention. [Figure 2] FIG. 2 is a front cross-sectional view of the existing pipe during the rehabilitation work, taken along line II-II in FIG. [Figure 3] Fig. 3(a) is a flowchart of the facing adjustment, and Fig. 3(b) is a subroutine flow of the mark position detection step in the facing adjustment. [Figure 4] FIG. 4 is a side cross-sectional view showing the adjustment of the orientation of the rehabilitation pipe at the starting manhole side portion of the existing pipe in the process of determining the normal spiral trajectory. [Figure 5] FIG. 5 is a front cross-sectional view of the existing pipe taken along line VV in FIG. [Figure 6] FIG. 6 is a side cross-sectional view showing the adjustment of the orientation of the rehabilitation pipe at the starting manhole side portion of the existing pipe in the process of determining the reference angle position in the vertical direction using a measuring instrument. [Figure 7] 7 is a rear cross-sectional view of the existing pipe taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a rear cross-sectional view of the existing pipe taken along line VIII-VIII in FIG. 9, illustrating a process of determining a reference angular position in the lateral direction using the measuring device. [Figure 9] FIG. 9 is a plan cross-sectional view of the existing pipe taken along line IX-IX in FIG. [Figure 10] FIG. 10 is a rear cross-sectional view of the existing pipe, showing a modified embodiment of the step of determining the reference angular position using the measuring device. [Figure 11] FIG. 11 is a side cross-sectional view showing a state in which a winding ring, which will be the starting pipe end of the rehabilitation pipe, is installed on the starting manhole side portion of the existing pipe. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, an existing pipe 1 is rehabilitated by lining its inner periphery with a rehabilitation pipe 9. The existing pipe 1 to be rehabilitated is, for example, an underground, deteriorated sewer pipe. Note that the existing pipe is not limited to a sewer pipe, but may also be a water supply pipe, an agricultural water pipe, a hydroelectric power generation water pipe, a gas pipe, a tunnel, etc.

[0015] As shown in FIG. 1, the rehabilitation pipe 9 is a spiral pipe made from a long strip-shaped member 10. Male and female mating portions 13, 14 are formed on both edges of the strip-shaped member 10 in the strip width direction (see Patent Documents 1 and 2 cited above). The strip-shaped member 10 is wound spirally around the inner peripheral surface 1a of the existing pipe 1, and the male and female mating portions 13, 14 on adjacent edges of the wound strip-shaped member 10, one turn apart, overlap and engage with each other. The effective strip width W10 of the strip-shaped member 10 is the total width W10' of the strip-shaped member 10 minus the overlap width W10" of the adjacent edges.

[0016] As shown in Figures 1 and 2, the rehabilitating pipe 9 is manufactured using a so-called self-propelled pipe manufacturing machine 20. The pipe manufacturing machine 20 is located at the pipe end 9e, ahead of the pipe manufacturing process (to the right in Figure 1), of the rehabilitating pipe 9 during pipe manufacturing. The pipe manufacturing machine 20 has a structure similar to that of the pipe manufacturing machine disclosed in, for example, the aforementioned Patent Document 1, and includes a frame 21, a pair of drive rollers 22 mounted on the frame 21, and a pipe end guide 23. The pipe end guide 23 is engaged with the pipe end 9e so as to be slidable in the circumferential direction of the pipe. The drive rollers 22 clamp the unformed pipe band portion 19 of the band-shaped member 10, which continues from the pipe end 9e, and push it toward the pipe end 9e. This causes the male and female mating portions 13, 14 at the adjacent edges of the unformed pipe band portion 19 and the pipe end 9e to overlap and engage with each other. This causes the unformed pipe band portion 19 to be fitted into the pipe end 9e, and pipe manufacturing continues. As the pipe is produced, the pipe production machine 20 is propelled (self-propelled) in a spiral shape along the inner surface 1a of the existing pipe 1, with the pushing force of the drive roller 22 acting as a propulsion reaction force. In this way, the rehabilitating pipe 9 is successively extended toward the front side of the pipe production (to the right in FIG. 1). The unprocessed pipe strip portion 19 of the strip-shaped member 10 passes from a drum (not shown) on the ground through the starting manhole 4, passes through the inside of the rehabilitating pipe 9 being processed, and is introduced into the pipe processing machine 20, and is continuous with the pipe end portion 9e.

[0017] Preferably, the rehabilitation pipe 9 is manufactured so that it is attached to the entire inner peripheral surface 1a of the existing pipe 1. Therefore, the manufactured pipe diameter φ9 of the rehabilitation pipe 9 corresponds to the inner diameter φ1 of the existing pipe 1. Specifically, the outer diameter of the rehabilitation pipe 9 is substantially equal to the inner diameter of the existing pipe 1. The inner diameter (inner diameter) of the rehabilitation pipe 9 is substantially equal to the inner diameter (inner diameter) of the existing pipe 1 minus twice the pipe thickness of the rehabilitation pipe 9 (i.e., the band thickness of the strip-shaped member 10).

[0018] As shown in Figures 3 and 4, during pipe manufacturing, an adjustment is made to align the rehabilitating pipe 9 with the existing pipe 1. That is, an operation is performed to adjust the pipe manufacturing trajectory 9R along the actual winding direction of the rehabilitating pipe 9 so that it is aligned with the regular spiral trajectory R0 based on the existing pipe 1. As shown in the flowchart in Figure 3(a), the adjustment to align the rehabilitating pipe 9 with the existing pipe 1 is roughly performed according to the following procedure.

[0019] First, the mark position MP on the normal spiral trajectory R0 in the existing pipe 1 is determined (step 101). A track mark M is attached to the mark position MP (step 102). Using the track mark M as an index, the actual winding direction of the rehabilitating pipe 9, that is, the pipe making track 9R, is adjusted so that it follows the regular spiral track R0 (step 103).

[0020] Furthermore, as shown in the subroutine flow of FIG. 3(b), in step 101 for determining the mark position MP, a reference circle C1 is defined within the existing pipe 1, and multiple reference angular positions AP are set on the reference circle C1 (step 110). The arrangement angles θ of each of these reference angular positions AP are AP A plurality of landmark positions MP are determined according to the above (step 111).

[0021] As shown in Figure 4, the helical axis C0 of the normal helical track R0 is aligned with the pipe axis 1c of the existing pipe 1. When the rehabilitation pipe 9 is attached to the inner surface 1a of the existing pipe 1, the helical axis C0 coincides with the pipe axis 1c of the existing pipe 1. The helical pitch P0 of the normal helical track R0 is determined by the effective band width W10 of the band-shaped member 10 and the pipe diameter φ9. If the lead angle of the helical track R0 is α0, then the following relationship theoretically holds: W10=P0·cosα0(1) P0=π·φ9·tanα0(2)

[0022] The procedure for adjusting the facing of the rehabilitating pipe 9 will be described in detail below. As shown in FIGS. 4 and 5, the facing adjustment is performed, for example, at the start-side pipe opening 1 e of the existing pipe 1 connected to the start manhole 4 when the rehabilitating pipe 9 is unwound. The reference circle C1 is a circle where the inner peripheral surface 1a intersects with a cross section perpendicular to the pipe axis 1c at the axial reference position 1p in the existing pipe 1. The axial reference position 1p is an axial reference position along the pipe axis 1c. Preferably, the axial reference position 1p is set in the existing pipe 1 at a position where the facing adjustment is started or performed, i.e., near the starting pipe opening 1e.

[0023] 5, multiple (here, four) reference angular positions AP (=APa, APb, APc, APd) are set at intervals of 90° at the bottom, top, and both sides of the existing pipe 1.

[0024] Specifically, as shown in Figures 6 and 7, a measuring device 30 for setting a reference angle position is prepared. The measuring device 30 is a cross-shaped ruler having a vertical ruler 31 and a horizontal ruler 32. The vertical and horizontal rulers 31, 32 are each extendable. The vertical ruler 31 and horizontal ruler 32 are perpendicular to (intersect with) each other via a slide holder 33. The slide holder 33 is attached to the vertical ruler 31 so as to be slidable in the extension direction of the vertical ruler 31, and holds the horizontal ruler 32 so as to be slidable in the extension direction of the horizontal ruler 32.

[0025] As shown in FIG. 7, the vertical ruler 31 of the measuring device 30 is oriented vertically, and the lower end 31a (one end) of the vertical ruler 31 is abutted against the bottom of the inner circumferential surface 1a near the starting pipe opening 1e of the existing pipe 1 and fixed in position. At this stage, the horizontal ruler 32 may be removed. The vertical ruler 31 is then rotated around the lower end 31a to determine the vertical reference state of the vertical ruler 31. Specifically, as shown by the arrow a in FIG. 7, the upper end 31c (the other end) of the vertical ruler 31 is displaced in the circumferential direction of the pipe. The vertical ruler 31 is found to be at its longest when the upper end 31c abuts against the periphery of the pipe top of the inner circumferential surface 1a at each displacement position. Furthermore, as shown by the arrow b in FIG. 6, the upper end 31c is displaced in the axial direction of the pipe. The state (vertical reference state) where the vertical ruler 31 is shortest when the upper end 31c abuts against the periphery of the pipe top of the inner circumferential surface 1a at each displacement position is determined. Then, in the vertical reference state, the points where both end portions 31c, 31a of the vertical ruler 31 abut against the inner peripheral surface 1a are set as two reference angular positions APc, APa in the vertical direction.

[0026] Next, as shown in FIG. 8, the horizontal ruler 32 is positioned so that it intersects with the exact midpoint of the vertical ruler 31 in the vertical reference state. Furthermore, a level 34 may be attached to the horizontal ruler 32 to ensure that the horizontal ruler 32 is horizontal. Then, as shown by the arrow c in FIG. 9, the measuring device 30 and, consequently, the horizontal ruler 32 are rotated around the vertical ruler 31 as the central axis, and the horizontal reference state in which the horizontal ruler 32 is shortest when both ends 32b, 32d of the horizontal ruler 32 abut against the inner circumferential surface 1a at each displacement angle is found. The points at which both ends 32b, 32d of the horizontal ruler 32 abut against the inner circumferential surface 1a in the horizontal reference state are set as the two horizontal reference angle positions APb, APd.

[0027] Next, as shown in Figures 4 and 5, positions spaced a distance Da, Db, Dc, and Dd from each reference angular position APa, APb, APc, and APd toward the front of the pipe making process (to the right in Figure 4) along the spiral axis C0 are set as mark positions MPa, MPb, MPc, and MPd, respectively. The distances Da, Db, Dc, and Dd are determined by the arrangement angles θ of the corresponding reference angular positions APa, APb, APc, and APd. APa ,θ APb ,θAPc ,θ APd and is determined according to the helical pitch P0 of the normal helical orbit R0.

[0028] Preferably, the distance D (=Da, Db, Dc, Dd) is expressed by the following formula. D=P0·θ AP / (2π) (3)

[0029] Placement angle θ AP (=θ APa ,θ APb ,θ APc ,θ APd ) are angles (rad) of the respective reference angle positions APa, APb, APc, and APd, with the pipe bottom being the reference angle (0 rad) and the winding direction of the rehabilitating pipe 9 (counterclockwise in FIG. 5) being positive. In FIG. 5, θ APb =π / 2, θ APc = π, θ APd ,=3π / 2,θ APa = 2π. Therefore, in Figure 4, Db = P0 / 4, Dc = P0 / 2, Dd = 3P0 / 4, and Da = P0.

[0030] As shown in Figure 4, track marks M1, M2, M3, and M4 are provided at the mark positions MPa, MPb, MPc, and MPd thus determined, respectively. Preferably, the track marks M1, M2, M3, and M4 are applied to the inner peripheral surface 1a of the existing pipe 1 using chalk or color spray. It is preferable that the error of the determined mark position from the true value is within 5 mm.

[0031] The range in which the trajectory marks M are placed is not limited to a range of one pitch P0 of the regular helical trajectory R0 from the axial reference position 1p, but may extend over a range of several pitches (n × P0) of the regular helical trajectory R0 from the axial reference position 1p or more (see the two-dot chain line M in Figure 11). In this case, the distance D from each reference angular position AP to the mark position MP is expressed by the following equation. D=P0·θ AP / (2π)+n·P0(4) In formula 4, n is an integer of 0 or greater.

[0032] It should be noted that the vertical ruler 31 of the measuring device 30 does not necessarily have to be oriented up and down, and the horizontal ruler 32 does not necessarily have to be oriented horizontally. 10, the vertical ruler 31 and the horizontal ruler 32 may be arranged so as to be oblique, and the reference angle positions APa, APb, APc, and APd may be set at oblique angle positions on the reference circle C1. As a result, the mark positions MPa, MPb, MPc, and MPd, and therefore the track marks M1, M2, M3, and M4, may be set at oblique angle positions on the inner peripheral surface 1a of the existing pipe.

[0033] Separately, as shown in Fig. 11, an unwinding ring 9a (the starting end of the rehabilitation pipe 9) is produced by winding a strip-shaped member 10 several times into a spiral having the same diameter as the pipe manufacturing diameter φ9. A pipe manufacturing machine 20 is attached to the unwinding ring 9a. The unwinding ring 9a and pipe making machine 20 are installed inside the starting pipe opening 1e. At this time, the track marks M1, M2, M3, and M4 on the inner surface 1a of the existing pipe 1 are used as indicators to align the spiral track of the unwinding ring 9a with the normal spiral track R0. Specifically, the unwinding ring 9a is positioned so that its edge 9ae on the front side of the pipe making passes over the track marks M1, M2, M3, and M4. This allows the unwinding ring 9a to be directly facing the existing pipe 1. Alternatively, it is easy to confirm that the unwinding ring 9a is directly facing the existing pipe 1.

[0034] 1 and 2, the pipe making machine 20 is driven to make the rehabilitating pipe 9 following the unwinding ring 9a. By keeping the unwinding ring 9a facing the existing pipe 1, the rehabilitating pipe 9 can also be made facing the existing pipe 1. In other words, the rehabilitating pipe 9 can be made so that its spiral trajectory is aligned with the normal spiral trajectory R0. This prevents the pipe axis of the rehabilitating pipe 9 from being angled or misaligned with the spiral axis C0 of the normal spiral trajectory R0.

[0035] This prevents the occurrence of insufficient adhesion in some areas when manufacturing a rehabilitating pipe 9 so that it is attached to the entire inner peripheral surface 1a of the existing pipe 1. It also prevents problems such as the pipe manufacturing machine 20 being pressed too hard against the inner peripheral surface 1a of the existing pipe 1 and being unable to advance.

[0036] Furthermore, as shown by the two-dot chain line in Figure 11, by setting the track mark M over a range of several pitches (n x P0) of the normal spiral track R0 from the axial reference position 1p, it is possible to check and correct for each turn whether the rehabilitated pipe 9 being produced after unwinding is facing the existing pipe 1. This makes it possible to more reliably prevent problems such as insufficient adhesion during the production of the rehabilitated pipe 9 and the stoppage of the pipe production machine 20.

[0037] The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the location and time for adjusting the alignment of the rehabilitating pipe 9 relative to the existing pipe 1 is not limited to when it is unwound near the starting pipe opening 1e. The alignment adjustment can also be performed after passing through a bend where the pipe axis 1c of the existing pipe 1 curves. Because the path lengths along the pipe axis differ between the inner and outer portions of the bend, the alignment relationship is easily disrupted. Therefore, it is advisable to perform the alignment adjustment at the start of the subsequent straight section following the bend, rather than at the end of the bend. This can prevent problems such as insufficient adhesion of the rehabilitating pipe 9 or stoppage of the pipe making machine 20 in the subsequent straight section. Furthermore, the facing adjustment may be performed at any location within the existing pipe 1. The trajectory mark M is not limited to a point shape, but may be a spiral line shape along the regular spiral trajectory R0. The present invention is not limited to a method of attaching a rehabilitating pipe to the inner surface of an existing pipe, but can also be applied to a construction method in which a gap is formed between the outer periphery of the rehabilitating pipe and the inner periphery of the existing pipe and a backfill material is filled in the gap. In this case, the diameter of the rehabilitating pipe is smaller than the inner diameter of the existing pipe. [Industrial Applicability]

[0038] The present invention can be applied to, for example, a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0039] 1 Existing pipes 1a Inner surface 1c Existing pipe shaft 1e Starting pipe opening 1p Axial reference position 9 Rehabilitation pipe 9a Unwinding ring 9R pipe making track 10. Belt-shaped member 19 Unmade pipe belt section 20 Pipe making machine 30 Measuring instruments 31 Vertical Ruler 31a One end 31c Other end 32 Horizontal ruler 32b end 32d end 33 Slide holder Da,Db,Dc,Dd distance H0 normal spiral orbit C0 helical axis MPa, MPb, MPc, MPd Mark position M1,M2,M3,M4 Track marks P0 spiral pitch Pa,APb,APc,APd Reference angle position C1 Reference circle W10 Effective band width α0 lead angle θ APa ,θ APb ,θ APc ,θ APd Placement angle φ1 Existing pipe inner diameter φ9 pipe diameter

Claims

1. A method for manufacturing a spiral-shaped rehabilitation pipe consisting of a long strip-shaped member wound spirally along the inner circumferential surface of an existing pipe, comprising: a step of determining the position of a mark on a regular spiral track having a spiral axis that is an axis line along the pipe axis of the existing pipe and a spiral pitch that is determined based on the effective band width of the band-shaped member and the diameter of the pipe to be manufactured; providing a track mark at the mark location; a step of aligning the winding direction of the rehabilitating pipe along the spiral track using the track mark as an index; A pipe manufacturing method comprising:

2. a plurality of reference angle positions are set on a reference circle where a cross section perpendicular to the pipe axis at an axial reference position of the existing pipe intersects with the inner circumferential surface, the reference angle positions being spaced apart from each other in a pipe circumferential direction of the existing pipe; A pipe manufacturing method as described in claim 1, in which the mark positions are determined as positions away from each reference angle position toward the front of the pipe manufacturing along the pipe axial direction of the existing pipe by a distance corresponding to the circumferential arrangement angle of the reference angle position and the spiral pitch.

3. A cross-shaped measuring instrument having an extendable vertical ruler and an extendable horizontal ruler is prepared, one end of the vertical ruler is positioned and fixed on the inner peripheral surface, and the other end of the vertical ruler is displaced in the pipe circumferential direction so that the other end abuts against the inner peripheral surface at each displacement position, and in a vertical reference state in which the vertical ruler is at its longest when the other end is displaced in the pipe axial direction of the existing pipe so that the other end abuts against the inner peripheral surface at each displacement position, the points at which both ends of the vertical ruler abut against the inner peripheral surface are set as the two reference angle positions in the vertical direction, A pipe manufacturing method as described in claim 2, in which the horizontal ruler is intersected with the midpoint of the vertical ruler in the vertical reference state, and the horizontal ruler is rotated and displaced around the vertical ruler as the central axis so that when both ends of the horizontal ruler are abutted against the inner surface at each displacement angle, the horizontal ruler is at its shortest in the horizontal reference state, and the points at which both ends of the horizontal ruler abut against the inner surface are set as the two horizontal reference angle positions.

4. 2. The pipe manufacturing method according to claim 1, wherein the pipe diameter corresponds to the inner diameter of the existing pipe.

5. A pipe manufacturing method according to any one of claims 1 to 4, wherein the track markings are provided on the inner peripheral surface.

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