Pipe making device and pipe rehabilitation method

Abstract

To control the diameter of rehabilitated pipes during pipe making with a simple configuration and without deteriorating the yield.SOLUTION: While propelling the pipe-forming device 20 in a spiral winding direction along the inner wall 1a of the existing pipe 1, the pipe-forming device 20 forms the strip member 10 into a spiral tube-like rehabilitation pipe 3. A clearance measuring jig 50 installed on the pipe-making equipment 20 measures the clearance CL between the pipe end 3e in the forward direction and the inner wall 1a of the existing pipe 3 during pipe-making, and the diameter of the pipe is controlled by the measured value. The clearance measurement jig 50 includes a jig body 51 provided in the device body 11, a measuring member 52 protruding from the jig body 51 toward the inner wall 1a and movable in a direction opposite to the inner wall 1a, and a force means 53 to apply force to the measuring member 52 toward the inner wall 1a.SELECTED DRAWING: Figure 4(a)

Description

[Technical field]

[0001] The present invention relates to an apparatus for producing a helical rehabilitating pipe along the inner wall of an existing pipe, such as an aged sewer pipe, and a method for rehabilitating an existing pipe, and in particular to a self-propelled pipe producing apparatus and pipe rehabilitation method which produces a pipe while being propelled in a spiral winding direction. [Background technology]

[0002] It is known to rehabilitate existing pipes such as aged sewer pipes by lining the inner circumference of the pipe with a rehabilitation pipe (see Patent Documents 1, 2, etc.). A known rehabilitation pipe is a spiral pipe made by winding a band-shaped member made of synthetic resin in a spiral shape. Patent Document 1 discloses a self-propelled pipe-making device that produces a spiral rehabilitated pipe from a band-shaped member. The self-propelled pipe-making device includes a device main body that is disposed at the pipe end in front of the extension of the rehabilitated pipe during pipe making, and a pair of drive rollers provided on the device main body. The drive rollers clamp the band portion of the unmade pipe in the band-shaped member and push it into the pipe end to make the pipe. The reaction force from the pushing propels the pipe-making device in the spiral winding direction.

[0003] Furthermore, the pipe making device in Patent Document 1 is provided with a brake mechanism that applies a brake to the advancing by rubbing against the pipe end. By increasing the amount of pushing of the band portion of the unmade pipe by the drive roller compared to the amount of advancing when the brake is applied, the rehabilitated pipe can be enlarged in diameter and attached to the inner circumference of the existing pipe.

[0004] Patent Document 2 proposes expanding or contracting the diameter of a rehabilitated pipe by tilting the width direction of a pipe producing apparatus with respect to the axial direction of the pipe end. The pipe manufacturing device in Patent Document 3 is equipped with a wire. The wire is wound around the outer circumference of the end of the rehabilitating pipe. The rehabilitating pipe is manufactured to have a slightly enlarged diameter so that it is attached to the wire. By adjusting the length of the wire, the circumference and therefore the diameter of the rehabilitating pipe can be adjusted. Patent Document 4 describes that a scale is provided along the length of the band on the inner peripheral side surface of the band-shaped member (the surface that will become the inner peripheral surface of the rehabilitating pipe), thereby enabling changes in the pipe diameter of the rehabilitating pipe to be grasped. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication WO2016 / 175243 [Patent Document 2] International Publication WO2017 / 170866 [Patent Document 3] JP 2019-084728 A [Patent Document 4] JP 2017-209978 A Summary of the Invention [Problem to be solved by the invention]

[0006] According to the pipe manufacturing equipment in Patent Documents 1 and 2, by attaching the rehabilitating pipe to the inner wall of the existing pipe, it is possible to apply a backfill-less construction method that omits backfilling between the rehabilitating pipe and the existing pipe. However, if there is a step or a bend due to a joint or the like on the inner wall of the existing pipe, it is necessary to reduce the diameter of the rehabilitating pipe to pass through the step or bend. Even if the diameter is reduced, it must not be made smaller than the specified rehabilitating pipe diameter (standard rehabilitating diameter) in order to ensure the flow rate in the rehabilitating pipe.

[0007] For this reason, when reducing the diameter of a rehabilitated pipe, it is necessary to manage the diameter of the rehabilitated pipe. Currently, the pipe-making device stops driving after each revolution and an operator measures the diameter of the rehabilitated pipe with a tape measure, which results in a poor yield. The same is true when the pipe diameter is read from the scale or markings on the belt-shaped member, which also results in a poor yield. It is possible to use digital devices such as a digital distance meter or speed sensor to calculate the rehabilitated diameter from the speed of the pipe making machine, but this would be costly. In view of the above circumstances, an object of the present invention is to provide a method for managing the diameter of a rehabilitated pipe during pipe making using a simple configuration without deteriorating the yield. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a pipe manufacturing apparatus that manufactures a helical rehabilitating pipe made of a strip-shaped member while being propelled in a helical winding direction along the inner wall of an existing pipe, the apparatus comprising: an apparatus main body provided on an inner periphery of a pipe end portion in front of the extension of the rehabilitating pipe during pipe making so as to be movable in the spiral winding direction; at least one pair of drive rollers provided in the device body for clamping the band portion of the unmade pipe in the band-shaped member and pushing it obliquely toward the pipe end, thereby obtaining a force for the pipe making and the propulsion; a clearance measuring tool for measuring a clearance between the pipe end and the inner wall; The clearance measurement tool comprises: A jig body provided on the device body; a measuring member that protrudes from the jig body toward the inner wall and is movable in a direction facing the inner wall; a biasing means for biasing the measuring member toward the inner wall; The present invention is characterized by comprising:

[0009] The rotary drive of the drive roller advances the production of the rehabilitated pipe and propels the pipe producing device. The measuring member of the clearance measuring jig is protruded from the jig body by the biasing means and is abutted against the inner wall of the existing pipe, and is moved over the inner wall of the existing pipe as the pipe making device is advanced. By checking the protrusion of the measuring member, the clearance between the inner wall of the existing pipe and the rehabilitated pipe can be grasped. If the clearance is known, the diameter of the rehabilitated pipe can be derived from the diameter of the existing pipe and the thickness of the rehabilitated pipe. Therefore, by controlling the clearance, the diameter of the rehabilitated pipe can be controlled, and it can be determined whether the pipe should be enlarged or reduced, and whether the pipe diameter is below the standard rehabilitated diameter. To manage the diameter of a rehabilitated pipe, there is no need to measure the diameter of the rehabilitated pipe using a tape measure, and deterioration of the yield can be prevented. The clearance measurement jig has a simple configuration and can reduce costs.

[0010] Preferably, the measuring member is formed in an axial shape with its base end facing away from the inner wall held in the jig body so that it can be inserted and retracted, and the outer peripheral surface of the measuring member is provided with a marked line indicating the amount of protrusion from the jig body. This makes it possible to easily grasp the amount of protrusion of the measuring member, and therefore the clearance, by visually checking whether or not the marked line is visible, thereby facilitating management of the pipe diameter of the rehabilitated pipe. For example, when the clearance corresponds to the standard rehabilitating diameter, by setting the marked line to be positioned at the inlet / outlet of the jig body, it is possible to easily determine whether the marked line is protruding or retracting from the inlet / outlet and, by visually checking, whether the marked line is protruding or retracting from the inlet / outlet, whether the rehabilitating pipe has been reduced in diameter too much. A plurality of markings of different colors may be arranged at intervals in the axial direction of the measuring member. For example, a yellow marking and a red marking may be provided so that if both markings are recessed into the jig body, it indicates that there is room for further reduction in the diameter of the pipe, if only the yellow marking protrudes from the jig body, it indicates that the allowable limit of further reduction in the diameter of the pipe is about to be reached, and if both the red markings protrude, it indicates that further reduction in the diameter of the pipe is not possible. The markings may be scale marks indicating the amount of protrusion of the measuring member and thus the clearance.

[0011] Preferably, the tip of the measuring member facing the inner wall has a tapered shape. This reduces the sliding friction when the measuring member slides along the inner wall of the existing pipe as the pipe making machine advances. Even if the inner wall of the existing pipe is slightly uneven, the measuring member can slide smoothly. This prevents the measuring member from bending or breaking.

[0012] Preferably, the measuring member is provided with a rolling element capable of rolling in contact with the inner wall. This reduces the frictional resistance between the measuring member and the inner wall of the existing pipe when the pipe making device is advanced. Furthermore, it is possible to reliably avoid interference between the measuring member and the inner wall of the existing pipe, and to reliably prevent deformation or damage of the measuring member.

[0013] Preferably, the clearance measuring jig is provided on a side surface of the device body facing the extended forward direction. This allows the clearance measurement tool to be easily viewed from the front side of the rehabilitating pipe during pipe making, and the protruding amount of the measurement member can be easily confirmed. Also, it is possible to reliably prevent the rehabilitating pipe from being interposed between the clearance measurement tool and the inner wall of the existing pipe, and it is possible to reliably abut the measurement member against the inner wall of the existing pipe.

[0014] More preferably, the clearance measuring jig is provided on a side surface of the device body facing the extended forward direction at an end portion on the rear side of the thrust direction. The rear end of the main body of the device is subject to relatively small fluctuations in the inclination of the pipe making device, etc. By installing the clearance measuring tool there, the clearance can be measured stably.

[0015] The method of the present invention includes a step of producing a belt-shaped material supplied to the pipe producing device into a helical rehabilitating pipe by the pipe producing device while advancing the pipe producing device in a helical winding direction along the inner wall of the existing pipe; a step of measuring a clearance between the end of the rehabilitating pipe in the pipe making process and the inner wall by a clearance measuring tool provided on the pipe making device; a step of controlling a pipe diameter of the rehabilitated pipe based on the clearance measurement value; The present invention is characterized by comprising: The diameter (inner diameter) of the rehabilitated pipe, i.e., the manufactured pipe diameter, can be determined from the clearance between the inner wall of the existing pipe and the rehabilitated pipe, the diameter (inner diameter) of the existing pipe, and the thickness of the rehabilitated pipe. Usually, the diameter of the existing pipe is known. The thickness of the rehabilitated pipe is equal to the thickness of the band-shaped member and is also known. Therefore, the diameter of the rehabilitated pipe can be controlled by measuring the clearance.

[0016] Preferably, the clearance is measured each time the pipe making apparatus is positioned at the top of the existing pipe. Normally, the clearance is largest at the top of the pipe. Therefore, by measuring the clearance at the top of the pipe, the diameter of the rehabilitated pipe can be managed accurately. The clearance only needs to be checked each time the pipe making device makes one revolution, reducing the complexity of pipe diameter management.

[0017] Preferably, after the pipe production is completed up to a predetermined position just before the cross-sectional displacement portion of the existing pipe, the pipe production is performed so that the diameter of the rehabilitated pipe is reduced, and the clearance is measured; After the pipe is produced until it passes through the cross-sectional deformation portion, the rehabilitated pipe is produced so as to be expanded in diameter. This makes it possible to prevent the rehabilitating pipe from getting caught on the cross-sectional deformation portion. When reducing the diameter of a pipe, the clearance measurement value can be used to determine whether the diameter of the rehabilitated pipe is smaller than the standard rehabilitated diameter. The cross-sectional deformation portion includes a step, a bent portion, and an uneven portion.

[0018] Preferably, a belt-shaped member having a rigidity such that the rehabilitation pipe becomes a self-supporting pipe is used as the belt-shaped member, In the pipe making process, the rehabilitating pipe is made to adhere to the inner wall. This allows the rehabilitated pipe to be a self-supporting pipe. Also, by attaching the rehabilitated pipe to the inner wall of the existing pipe, a backfill-less construction method can be adopted that omits the need to fill the gap between the existing pipe and the rehabilitated pipe with mortar or other backfilling material, thereby shortening the construction period and reducing construction costs. By measuring the clearance, it is possible to accurately determine whether the rehabilitated pipe is attached to the inner wall of the existing pipe. In addition, the diameter of the rehabilitated pipe can be calculated with high accuracy regardless of the circumferential position of the pipe where the clearance is measured. Furthermore, since the rehabilitated pipe hardly bends under its own weight and there is a high correlation between the clearance and the diameter of the rehabilitated pipe, the diameter of the rehabilitated pipe can be accurately managed by measuring the clearance. Effect of the Invention

[0019] According to the present invention, the diameter of a rehabilitated pipe during pipe making can be controlled with a simple configuration without deteriorating the yield. [Brief description of the drawings]

[0020] [Figure 1] Figure 1 shows an existing pipe being rehabilitated by a pipe making apparatus according to the first embodiment of the present invention, where (a) is a cross-sectional view of the stage of rehabilitating a straight section of the existing pipe, (b) is a cross-sectional view of the stage of reducing the diameter of the rehabilitated pipe just before the cross-sectional displacement section of the existing pipe, (c) is a cross-sectional view of the stage of expanding the diameter of the rehabilitated pipe after passing through the cross-sectional displacement section, and (d) is a cross-sectional view of the stage of rehabilitating a straight section of the existing pipe extending forward from the cross-sectional displacement section. [Diagram 2] Fig. 2(a) shows a band-shaped member constituting the rehabilitating pipe, and is a cross-sectional view taken along line IIa-IIa in Fig. 3. Fig. 2(b) is an enlarged cross-sectional view of a circular portion IIb in Fig. 2(a). Fig. 2(c) is a cross-sectional view of the rehabilitating pipe and the existing pipe during pipe making taken along line IIc-IIc in Fig. 3. [Diagram 3] FIG. 3 is a front view of the pipe making apparatus during rehabilitation work, taken along line III-III in FIG. 1(a). [Figure 4(a)] FIG. 4(a) is an enlarged cross-sectional view of a circle IVa in FIG. 1(a) which shows a schematic structure of the pipe making apparatus. [Figure 4(b)] FIG. 4(b) is an enlarged cross-sectional view showing the circular portion IVb in FIG. 1(b) with the clearance between the inner wall of the existing pipe and the rehabilitating pipe set to the maximum allowable value. [Diagram 5] Figure 5 shows the brake mechanism of the pipe making device, where (a) is a cross-sectional view taken along line Va-Va in Figure 4(b) when the brake is released, and (b) is a cross-sectional view taken along line Vb-Vb in Figure 4(a) when the brake is applied. [Figure 6] FIG. 6 is a cross-sectional view of a clearance measuring jig for the pipe making apparatus. [Figure 7] FIG. 7 is a cross-sectional view showing a clearance measuring tool according to a second embodiment of the present invention, with the protruding amounts of the measuring members increasing in the order of (a) to (c) of the same figure. [Figure 8]FIG. 8 shows a third embodiment of the present invention and is a cross-sectional view of a clearance measuring jig. [Figure 9] FIG. 9 shows the fourth embodiment of the present invention and is a cross-sectional view of a clearance measuring jig. [Figure 10] FIG. 10 shows the fifth embodiment of the present invention, and is a front view of the pipe producing apparatus during rehabilitation work, as viewed from the extension front side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 6)> 1(a) to 1(d) show the process of rehabilitating an existing pipe 1, which is an aged sewer pipe. The existing pipe 1 is rehabilitated by lining the inner wall 1a of the existing pipe 1 with a rehabilitation pipe 3. A cross-sectional displacement portion such as a step 1d is formed in the middle of the existing pipe 1. The existing pipe 1 to be rehabilitated is not limited to a sewer pipe, but may be a water supply pipe, an agricultural water pipe, a hydroelectric power generation water pipe, a gas pipe, or any other existing pipe, or may be a tunnel.

[0022] As shown in FIG. 1(a), the rehabilitation pipe 3 is a helical pipe formed by winding a band-shaped member 10 in a helical shape. As shown in FIG. 2(a), the band-shaped member 10 includes a band body 11 and a reinforcing band material 12, and is formed with a constant cross section and extends in the band length direction. The band body 11 is made of a synthetic resin such as polyvinyl chloride. The band body 11 is provided with one or more (two in the figure) ribs 15 with a T-shaped cross section that protrude toward the outer periphery (upward in FIG. 2(a)). A first fitting portion 13 and a second fitting portion 14 having a complementary concave-convex cross section are formed on both edges of the band body 11 in the band width direction (left and right in FIG. 2(a)).

[0023] A reinforcing strip 12 is provided on the outer peripheral side of the strip body 11 (the upper side in FIG. 2(a)). The reinforcing strip 12 is made of metal such as steel or iron. As shown in FIG. 2(b), the outer surface of the reinforcing strip 12 is covered with a coating layer 17 made of a resin such as polyethylene. The reinforcing strip 12 integrally has a body 12a with a roughly U-shaped cross section and a pair of legs 12b provided on both ends of the body 12a. The body 12a covers two ribs 15 of the strip body 11, and the legs 12b are engaged with engaging portions 16 formed integrally with the fitting portions 13, 14. The cross section of the belt-shaped member 10 is not limited to that shown in the figure, and various shapes can be adopted.

[0024] As shown in Fig. 2(c), in the rehabilitating pipe 3, the band-shaped member 10 is wound helically around the inner circumference of the existing pipe 1, and adjacent fitting portions 13, 14 that are one turn apart are fitted together in a concave-convex manner. As shown in Fig. 3, a band portion 19 of an unprocessed pipe in the band-shaped member 10 is continuous with a pipe end portion 3e on the front side in the axial extension direction of the rehabilitating pipe 3 during pipe making. Although detailed illustration is omitted, the unprocessed pipe band portion 19 hangs down from the ground to the starting manhole, passes through the inside of the rehabilitating pipe 3 during pipe making, and is connected to the pipe end portion 3e.

[0025] As shown in Fig. 3, the rehabilitating pipe 3 is attached to the entire circumference of the inner wall 1a of the existing pipe 1. Note that the rehabilitating pipe 3, particularly the top portion, may be slightly separated from the inner wall 1a of the existing pipe 1. In that case, a narrow gap 2 is formed between the rehabilitating pipe 3 and the inner wall 1a of the existing pipe 1, as shown in Fig. 4(a).

[0026] The rehabilitating pipe 3 constitutes a self-supporting pipe having a required self-supporting strength by itself. The band-shaped member 10 has a degree of rigidity that enables the rehabilitating pipe 3 to constitute a self-supporting pipe. No backfilling material such as mortar is filled between the inner wall 1a of the existing pipe 1 and the rehabilitated pipe 3. The rehabilitated pipe 1X consisting of the existing pipe 1 and the rehabilitated pipe 3 has a backfill-less structure.

[0027] As shown in Figures 1(a) to 1(d), a self-propelled pipe making device 20 is disposed at the pipe end 3e. As shown in Figure 3, the pipe making device 20 includes an apparatus main body 21 (frame) which is shown diagrammatically by a two-dot chain line in the figure, and a drive unit 30. The apparatus main body 21 is disposed on the inner circumference at one location in the circumferential direction of the pipe end 3e so as to be movable in the spiral winding direction. The longitudinal direction of the apparatus main body 21 and therefore the pipe making device 20 is oriented in the spiral winding direction of the rehabilitating pipe 3. The width direction of the pipe making device 20 which is perpendicular to the longitudinal direction is roughly along the extension direction, i.e., the pipe axis, of the rehabilitating pipe 3, and strictly speaking is inclined by the lead angle of the spiral with respect to the pipe axis of the rehabilitating pipe 3.

[0028] As shown in Figure 3, the longitudinal dimension of the pipe making device 20 is sufficiently shorter than the circumferential length of the pipe end 3e, and the pipe end 3e other than where the pipe making device 20 is located is open to the inner circumferential side. The circumferential portion of the pipe end 3e other than where the device main body 21 is located is open to the inner circumferential side. The pipe making device 20 is not provided with an inner circumferential regulating body that regulates the circular shape of the pipe end 3e from the inner circumferential side.

[0029] As shown in Fig. 3, a drive unit 30 is provided in the central portion 21c of the device body 21. As shown in Fig. 4(a), the drive unit 30 includes at least one pair of an outer peripheral drive roller 31 and an inner peripheral drive roller 32, and a drive motor 33. The unmade pipe belt portion 19 is sandwiched between the drive rollers 31, 32. The output shaft of the drive motor 33, which is a hydraulic motor, is connected to each of the drive rollers 31, 32 via a power transmission mechanism (not shown) such as a gear. The drive rollers 31, 32 are rotationally driven by the drive motor 33.

[0030] 3, a plurality of tube end guides 22, 23, 24 are provided at a distance from each other in the longitudinal direction on the device body 21. Each of the tube end guides 22, 23, 24 is engaged with the tube end 3e so as to be slidable in the spiral winding direction.

[0031] As shown in Figures 3 and 4(a), a brake mechanism 40 is incorporated in the tube end guide 22 at the front of the thrust. The brake mechanism 40 includes a brake shaft 41, a brake operating lever 42 (Figure 3), and a brake shoe 43. The brake shaft 41 is rotatably held in the device body 21. The axis of the brake shaft 41 is oriented in the width direction of the pipe making device 20 (left and right in Figure 4(a)). The brake operating lever 42 is detachably provided at the end of the brake shaft 41 on the extending front side (the front side of the paper in Figure 3).

[0032] As shown in FIG. 4(a), a brake shoe 43 is provided at the end of the brake shaft 41 on the extended rear side (the right side in FIG. 4(a)). As shown in FIG. 5(a), the brake shoe 43 is formed in an elliptical or circular shape that is eccentric with respect to the brake shaft 41. As shown in FIG. 5(a) and FIG. 5(b), the outer circumferential surface of the brake shoe 43 is close to and spaced apart from the inner circumferential surface of the pipe end 3e or in contact with it. As shown in FIG. 4(a) and FIG. 5(b), the pipe making device 20 is advanced with the brake shoe 43 in contact with the pipe end 3e, so that a sliding friction resistance (braking force) is applied between the pipe end 3e and the brake shoe 43. The pressing force of the brake shoe 43, and therefore the braking force, is adjusted according to the rotation angle of the brake shaft 41. This allows the pipe diameter of the pipe end 3e to be expanded or reduced by increasing or decreasing the advancing speed of the pipe making device 20 relative to the feed speed of the unmade pipe belt portion 19.

[0033] Furthermore, as shown in Figures 3 and 4(a), the pipe making apparatus 20 is provided with a clearance measuring tool 50 for measuring the size of the gap 2 (hereinafter referred to as "clearance CL"). The clearance measuring tool 50 is provided on the front side surface 21f facing forward in the extension direction, for example in the central portion 21c of the apparatus main body 21. As shown in Figure 4(a), the front side surface 21f protrudes further forward in the extension direction (left side in Figure 4(a)) than the pipe end portion 3e. Therefore, the clearance measuring tool 50 is positioned shifted toward the front side in the extension direction (left side in Figure 4(a)) than the pipe end portion 3e.

[0034] As shown in Fig. 6, the clearance measurement jig 50 includes a jig body 51, a measurement member 52, and a biasing means 53. The jig body 51 is formed in a cylindrical shape with its axis directed in the height direction of the pipe making apparatus 20 (the up-down direction in Fig. 6), and is fixed to the front side surface 21f. The tip end (the upper end in Fig. 4(a)) of the jig body 51, i.e., the end facing the existing pipe inner wall 1a, is opened to form an inlet / outlet 51c.

[0035] As shown in Fig. 6, the measuring member 52 is formed in an axial shape coaxial with the jig body 51. A base end 52b of the measuring member 52 facing the opposite side to the existing pipe inner wall 1a (the lower side in Fig. 4(a)) is housed and held in the jig body 51 so as to be able to protrude and retract. A portion of the measuring member 52 on the tip side from the base end 52b protrudes from an inlet 51c of the jig body 51 toward the existing pipe inner wall 1a. As shown in Fig. 6, the tip end 52a of the measuring member 52 has a tapered shape, and the tip is preferably rounded in a paraboloid of revolution or hemisphere.

[0036] As shown in Fig. 4(a), the clearance measuring jig 50 is disposed further forward than the pipe end 3e of the rehabilitating pipe 3, so that the measuring member 52 directly faces the existing pipe inner wall 1a. As shown in Fig. 4(a) and Fig. 4(b), the measuring member 52 can advance and retreat along the jig body 51 in the direction facing the existing pipe inner wall 1a.

[0037] 6, biasing means 53 made of a compression coil spring is housed in jig body 51. Biasing means 53 biases measuring member 52 so as to protrude from jig body 51 toward inner wall 1a of the existing pipe. A stopper 57 for preventing the measuring member 52 from slipping out is provided on the periphery of the inlet 51c.

[0038] 6, a marked line 54 indicating the amount of protrusion from the jig body 51 is provided on the outer circumferential surface of the measuring member 52. Preferably, the marked line 54 is formed in a ring shape over the entire circumference of the measuring member 52. More preferably, the marked line 54 is colored in a conspicuous color such as red, yellow, or blue.

[0039] As shown in FIG. 4(a), the distance L from the tip of the measuring member 52 to the marked line 54 54 is the maximum allowable value of the clearance CL (hereinafter referred to as "allowable clearance CL max As shown in FIG. 4(b), the protrusion amount of the measuring member 52 from the jig body 51 is set to correspond to the allowable clearance CL max At this time, the mark 54 is located at the entrance 51c. The allowable clearance CL max is the standard rehabilitated diameter of the rehabilitated pipe 3, i.e., the minimum allowable pipe diameter (inner diameter) φ3 to ensure flow rate. min and the inner diameter φ1 (known) of the existing pipe 1, and satisfies the following formula. φ3 min +CL max +2t3=φ1 (Formula 1) Here, t3 is the pipe thickness of the rehabilitating pipe 3, and is equal to the thickness (known) of the strip-shaped member 10.

[0040] The rehabilitating pipe 3 (helical pipe) is manufactured as follows. <Pipe manufacturing process> As shown in Figures 3 and 4(a), the unmade pipe band portion 19 of the band-shaped member 10 is supplied to the pipe making device 20, where it is clamped between a pair of drive rollers 31, 32, and is pushed obliquely by these drive rollers 31, 32 toward the fitting position 3x on the pipe end 3e. As a result, at the fitting position 3x, the opposing fitting portions 13, 14 of the unmade pipe band portion 19 and the pipe end 3e are fitted together with each other by projections and recesses, and the unmade pipe band portion 19 is incorporated into the rehabilitated pipe 3 (see Figure 2(c)), and pipe making progresses. In addition, the pushing and the fitting generate a propulsion reaction force, which propels the pipe making device 20 in the spiral winding direction (clockwise in Figure 3) along the existing pipe inner wall 1a. In other words, the force for pipe making and propulsion is obtained by the drive unit 30.

[0041] As shown in Fig. 1(a), preferably, in the straight section 1b where the pipe axis of the existing pipe 1 is straight, pipe production is performed so that the rehabilitated pipe 3 sticks to the existing pipe inner wall 1a. For example, as shown in Figs. 3 and 5(b), the operating lever 42 of the brake mechanism 40 is operated to apply a brake between the brake shoe 43 and the pipe end 3e. This makes the forward movement speed of the pipe production device 20 slower than the feed speed of the unmade pipe portion 19, and the rehabilitated pipe 3 is produced into an expanded pipe. As a result, the rehabilitated pipe 3 sticks to the existing pipe inner wall 1a.

[0042] <Clearance measurement process> In parallel with the pipe manufacturing, the clearance CL between the pipe end 3e and the inner wall 1a of the existing pipe is measured using a clearance jig 50. More specifically, as shown in Figure 4(a), during pipe making, the tip 52a of the measuring member 52 is abutted against the existing pipe inner wall 1a by the elastic force of the biasing means 43. The measuring member 52 is protruded from and retracted from the jig body 51 according to the clearance CL. Therefore, the clearance CL can be measured by the protruding amount of the measuring member 52. Since the clearance measuring jig 50 is provided on the front side surface 21f of the pipe making device 20, an operator can easily visually confirm the protruding amount of the measuring member 52 from the pipe making device 20, and in turn, from the extending forward side of the pipe end portion 3e of the rehabilitating pipe 3, and can easily measure the clearance CL.

[0043] As the pipe making device 20 advances, the measuring member 52 slides along the existing pipe inner wall 1a. Since the tip 52a of the measuring member 52 has a rounded tapered shape, the measuring member 52 can slide smoothly. As a result, the measuring member 52 can be prevented from bending or breaking.

[0044] <Pipe diameter control process> The measured value of the clearance CL can be used to determine whether the rehabilitating pipe 3 has been manufactured so as to stick to the inner wall 1a of the existing pipe. In other words, if the measured clearance CL is 0 mm to a few mm or less, it can be said that the pipe has been manufactured so as to be substantially stuck to the wall. Furthermore, by measuring the clearance CL, the pipe diameter (inner diameter φ3) of the rehabilitating pipe 3 can be calculated. Theoretically, the pipe diameter φ3 is expressed by the following formula. φ3 = φ1 - CL - 2t3 (Equation 2) This makes it possible to control the degree of adhesion and the pipe diameter of the rehabilitating pipe 3 from the clearance CL. There is no need to measure the diameter of the rehabilitated pipe using a tape measure, and deterioration of the work efficiency can be prevented. The clearance measurement jig 50 has a simple configuration and can reduce costs. Since the pipe is made by attaching the pipe, the clearance CL is small and the measurement error is small. Therefore, the pipe diameter of the rehabilitating pipe 3 can be calculated with high accuracy. Furthermore, since the rehabilitated pipe 3 is a self-supporting pipe and hardly bends under its own weight, and there is a high correlation between the clearance CL and the pipe diameter φ3, the pipe diameter can be accurately controlled by measuring the clearance.

[0045] Preferably, the clearance CL is measured using the clearance measuring tool 50 each time the pipe making device 20 is positioned at the pipe top 1p of the existing pipe 1. Since the pipe top 1p is usually the location where the clearance CL is largest, by measuring the clearance CL at the pipe top 1p, the adhesion state of the rehabilitating pipe 3 can be grasped reliably and efficiently. It is sufficient to measure the clearance CL each time the pipe making device 20 makes one revolution, and the clearance measurement work can be omitted at circumferential positions other than the pipe top 1p.

[0046] When the clearance CL is substantially above the range of 0 mm (CL = 0 mm to several mm), the pipe diameter is increased. More specifically, by applying the brakes using the brake mechanism 40, the advancing speed of the pipe making device 20 is made slower than the feed speed of the unmade pipe portion 19. This causes the rehabilitated pipe 3 to be enlarged in diameter, allowing it to be attached to the inner wall 1a of the existing pipe.

[0047] <Pipe manufacturing before and after the cross-sectional deformation part> As shown in FIG. 1(a), when there is a step 1d (cross-sectional displacement portion) in the inner wall of the existing pipe 1, the rehabilitating pipe 3 is manufactured so as to be attached to the inner wall 1a of the existing pipe up to a predetermined position 1q just before the step 1d. Preferably, the distance L from the predetermined position 1q to the step 1d is 1qis several times (for example, about 3 to 5 times) the helical pitch P of the rehabilitation pipe 3.

[0048] As shown in Fig. 1(b), after the pipe end 3e reaches the predetermined front position 1q, the rehabilitated pipe 3 is produced so that its diameter is reduced. Specifically, as shown in Fig. 5(a), the brake shoe 43 of the brake mechanism 40 is moved away from the pipe end 3e to deactivate the brake. This type of rehabilitated pipe 3 made of a strip-shaped member 10 has the characteristic that its diameter is reduced as the pipe is produced when the brake is not applied (see Patent Document 1, etc.). Therefore, the rehabilitated pipe 3 is produced so that its diameter is reduced from the predetermined front position 1q toward the step 1d.

[0049] In parallel with the diameter-reducing pipe production, the clearance CL is measured using a clearance measuring jig 50. Preferably, the clearance CL is measured each time the pipe production device 20 makes one revolution and is positioned at the pipe top 1p. This makes it possible to check whether the rehabilitated pipe 3 has been reduced in diameter to such an extent that it will not get caught on the step 1d. If the clearance CL just before the step 1d (preferably one pitch before) exceeds the size of the step 1d, the pipe can be produced without getting caught on the step 1d.

[0050] More preferably, during the diameter reduction pipe making, it is checked whether the rehabilitated pipe 3 is not reduced more than necessary. That is, based on the clearance measurement value CL, the pipe diameter is reduced to the standard rehabilitated diameter φ3 min Specifically, it is confirmed whether the marked line 54 is not visible from the exit 51c. If the marked line 54 is retracted into the jig body 51 and is not visible, the pipe diameter is the standard rehabilitating diameter φ3. min is greater and within the acceptable range.

[0051] As shown in FIG. 4(b), if the mark 54 coincides with the outlet 51c, the pipe diameter is the standard rehabilitating diameter φ3 min If the mark 54 protrudes from the outlet 51c and appears outside, the pipe diameter is the standard rehabilitating diameter φ3 minTherefore, by keeping the marked line 54 retracted within the jig body 51 during the diameter reduction process, the flow path cross-sectional area of ​​the rehabilitated pipe 3 can be prevented from falling below the allowable minimum value, and the required flow rate for a sewer pipe can be secured.

[0052] As shown in FIG. 1(b), the pipe is produced in a reduced diameter state up to position 1r where it passes through step 1d. As shown in Fig. 1(c), after reaching position 1r, pipe making is performed so that the diameter of the rehabilitated pipe 3 is expanded. That is, as shown in Fig. 5(b), the brake mechanism 40 applies the brakes to increase the pipe diameter. This makes it possible to make the rehabilitated pipe 3, which is extended forward of the step 1d, stick to the inner wall 1a of the existing pipe, as shown in Figs. 1(c) to 1(d). The degree of adhesion of the rehabilitated pipe 3 can be confirmed by measuring the clearance CL with the clearance measuring tool 50. In this manner, the existing pipe 1 can be rehabilitated by lining the inner wall 1a of the existing pipe with the rehabilitation pipe 3. Since the rehabilitating pipe 3 is a self-supporting pipe, there is no need to fill the gap between the existing pipe inner wall 1a and the rehabilitating pipe 3 with backfilling material. In other words, the existing pipe 1 can be rehabilitated using a backfill-less construction method. This allows the construction period to be shortened. Also, construction costs can be reduced.

[0053] Next, another embodiment of the present invention will be described. In the following embodiment, the same components as those in the above-described embodiment will be denoted by the same reference numerals in the drawings and the description thereof will be omitted. <Second embodiment (FIG. 7)> As shown in Fig. 7(a), in a pipe making apparatus according to a second embodiment of the present invention, two (multiple) marked lines 54A, 54B are provided on the outer peripheral surface of a measuring member 52 of a clearance measuring tool 50B. The two marked lines 54A, 54B are spaced apart from each other in the axial direction (up and down in Fig. 7) of the measuring member 52. These marked lines 54A, 54B are colored in different colors. The marked line 54A relatively closer to the tip end (upper side in Fig. 7) is colored, for example, yellow. The marked line 54B relatively closer to the base end (lower side in Fig. 7) is colored, for example, red.

[0054] Distance L from the tip of the measuring member 52 to the yellow marked line 54A 54A is the allowable clearance CL max The distance L from the tip of the measuring member 52 to the red marked line 54B is slightly shorter than the 54B is the allowable clearance CL max Approximately equal to.

[0055] In the clearance measurement process and pipe diameter management process during pipe production in the second embodiment, when both of the two marked lines 54A, 54B are recessed within the jig body 51 and cannot be seen from the outside, as shown in Figure 7(a), it can be determined that there is room for reducing the diameter of the pipe. As shown in FIG. 7(b), when only the yellow marked line 54A protrudes from the jig body 51 and appears outside, it can be determined that the allowable limit of diameter-reduced pipe making is about to be reached. As shown in FIG. 7(c), when the red marked line 54B also protrudes from the jig body 51 and appears outside, it can be determined that further diameter reduction in the pipe is not possible.

[0056] <Third embodiment (FIG. 8)> As shown in Fig. 8, in a pipe making apparatus according to a third embodiment of the present invention, a scale 55 is provided on the outer peripheral surface of a measuring member 52 of a clearance measurement jig 50C. The scale 55 includes a plurality of scale lines 56 (marker lines). These scale lines 56 are provided at intervals along the axis of the measuring member 52. Each scale line 56 indicates the amount of protrusion of the measuring member 52 from the jig body 51.

[0057] Distance L from the tip of the measuring member 52 56 is the allowable clearance CL max (See FIG. 4(b)). A specific scale line 56A is provided at the position where the protrusion amount is equal to the allowable clearance CL max The scale lines 56A may be colored in a color that stands out from the other scale lines 56, such as red, yellow, or blue, and may be thicker or longer than the other scale lines 56. Only the scale lines 56A may be annular over the entire circumference of the measuring member 52.

[0058] According to the third embodiment, the clearance CL can be easily measured by reading the scale 55 at the inlet / outlet port 51c, and the pipe diameter can be easily controlled. Pipe diameter is standard regeneration diameter φ3 min When the measured value exceeds the predetermined value, the particular scale line 56A is recessed into the jig body 51. Pipe diameter is standard regeneration diameter φ3 min At this time, the scale line 56A is located at the outlet 51c. Pipe diameter is standard regeneration diameter φ3 min When the temperature exceeds this value, the scale line 56A protrudes from the exit port 51c and appears outside. Therefore, depending on whether or not a particular scale line 56A is visible outside of the outlet 51c, it can be determined whether or not the pipe diameter is within the allowable range.

[0059] <Fourth embodiment (FIG. 9)> As shown in Fig. 9, in a pipe making apparatus according to a fourth embodiment of the present invention, a rolling element 60 is provided at a tip 52a of a measuring member 52 of a clearance measurement jig 50D. A bearing portion 61 that rotatably supports the rolling element 60 is provided at the tip of the measuring member 52. A pair of rolling elements 60 may be provided on either side of the tip 52a of the measuring member 52. The tip of the measuring member 52 may be bifurcated, and one rolling element 60 may be sandwiched between the bifurcated tips.

[0060] The axis of the rolling element 60 is oriented in the width direction of the pipe making apparatus (the direction perpendicular to the paper surface in FIG. 9). At least the tip 52a of the measuring member 52, and therefore the rolling element 60, may be rotatable around the axis of the jig body 51.

[0061] In the fourth embodiment, the rolling body 60 is grounded to the existing pipe inner wall 1a by the biasing force of the biasing means 53. The rolling body 60 rolls as the pipe making device 20 is advanced. This reduces friction between the measuring member 52 and the existing pipe inner wall 1a during advancement. Furthermore, interference between the measuring member 52 and the existing pipe inner wall 1a can be reliably avoided, and deformation or damage to the measuring member 52 can be reliably prevented.

[0062] <Fifth embodiment (FIG. 10)> As shown in Figure 10, in a pipe making apparatus 20E according to a fifth embodiment of the present invention, a clearance measurement jig 50 is provided on the side surface facing forward (the front side of the paper in Figure 10) of the end portion on the rear side of the pushing motion (the counterclockwise side in Figure 10) of the apparatus main body 21. In detail, the clearance measurement jig 50 is provided on the front side surface 24f facing forward (the front side of the paper in Figure 10) of the pipe end guide 24 on the rear side of the pushing motion.

[0063] The rear end of the pipe making device 20E, including the pipe end guide 24, is located rearward of the fitting position 3x, and is therefore relatively stable, with little displacement such as tilt. Therefore, by providing the clearance measuring jig 50 at the rear end, the clearance CL can be measured stably and accurately. Since the clearance measuring jig 50 is provided on the front side 24f of the pipe making apparatus 20E, an operator can easily visually confirm the amount of protrusion of the measuring member 52 from the extending forward side of the pipe making apparatus 20, and can easily measure the clearance CL.

[0064] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, as long as the jig body holds the measuring member in a manner that allows it to move forward and backward, the clearance measurement jig may have a structure in which the jig body is axial and the measuring member is cylindrical, and the axial jig body is inserted into the cylindrical measuring member. A mark line may be provided on the axial jig body. The cross-sectional displacement portion of the existing pipe 1 is not limited to the step 1d, but may be a bent portion or an uneven portion. By reducing the diameter of the rehabilitating pipe 3 just before the bent portion or uneven portion, the pipe can be smoothly manufactured at the bent portion or uneven portion, and by expanding the diameter after passing through the bent portion or uneven portion, the rehabilitating pipe 3 can be attached again to the inner wall 1a of the existing pipe. A plurality of embodiments may be combined with each other. For example, the clearance measurement tool 50D of the fourth embodiment (FIG. 9) may be provided with the plurality of marked lines 54A, 54B of the second embodiment (FIG. 7) or the scale lines 56 of the third embodiment (FIG. 8) as marked lines. The pipe making apparatus 20E of the fifth embodiment (FIG. 10) may be provided with any of the clearance measurement tools 50B, 50C, 50D of the second to fourth embodiments (FIGS. 7 to 9) instead of the clearance measurement tool 50. [Industrial Applicability]

[0065] The present invention is applicable, for example, to a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0066] 1 Existing pipes 1a Inner wall 1b Straight section 1d Step displacement part 1p tube top 1q Front position 1f Passing position 2 gap 3 Rehabilitation pipe 3e Tube end 10 Belt-shaped member 13 First fitting part 14 Second fitting part 19 Unmanufactured pipe belt section 20 Pipe making equipment 20E Pipe making equipment 21 Device body 21c Center section (drive unit storage section) 21f Front side 22 Pipe end guide ahead of thruster 24 Pipe end guide behind thruster 24f front side 30 Drive unit 31,32 Drive roller 40 Brake Mechanism 41 Brake shaft 43 Brake shoe 50 Clearance measuring fixture 51 Jig body 51c Outlet 52 Measuring Parts 52a Tip 52b Proximal end 53 Actuation means 54 Marked line 54A Marked line 54B Marked line 55 scale 56 Scale mark (marker line) 56A Specific scale markings (marker lines) CL Clearance (size of gap) 60 Rolling elements 61 Bearing section

Claims

1. A pipe manufacturing apparatus that manufactures a spiral-shaped rehabilitation pipe made of a belt-shaped member while being propelled in a spiral winding direction along the inner wall of an existing pipe, an apparatus main body provided on an inner periphery of a pipe end portion in front of the extension of the rehabilitating pipe during pipe making so as to be movable in the spiral winding direction; at least one pair of drive rollers provided in the device body for clamping the band portion of the unmade pipe in the band-shaped member and pushing it obliquely toward the pipe end, thereby obtaining a force for the pipe making and the propulsion; a clearance measuring tool for measuring a clearance between the pipe end and the inner wall; The clearance measurement tool comprises: A jig body provided on the device body; a measuring member that protrudes from the jig body toward the inner wall and is movable in a direction facing the inner wall; a biasing means for biasing the measuring member toward the inner wall; A pipe making apparatus comprising:

2. A pipe making apparatus as described in claim 1, wherein the measuring member is formed in an axial shape with its base end facing away from the inner wall being held in the jig body so that it can be retracted into the jig body, and the outer peripheral surface of the measuring member is provided with a marked line indicating the amount of protrusion from the jig body.

3. 2. A pipe making apparatus as claimed in claim 1, wherein the tip of said measuring member facing said inner wall is tapered.

4. 2. A pipe making apparatus according to claim 1, wherein the measuring member is provided with a rolling element capable of rolling in contact with the inner wall.

5. A pipe making apparatus according to any one of claims 1 to 4, wherein the clearance measuring tool is provided on a side surface of the apparatus body facing forward in the extension direction.

6. 6. A pipe making apparatus as described in claim 5, wherein the clearance measuring jig is provided on a side surface facing the extension front at an end portion on the rear side of the thrust of the apparatus body.

7. a step of producing a belt-shaped material supplied to the pipe producing device into a helical rehabilitating pipe by the pipe producing device while advancing the pipe producing device in a helical winding direction along the inner wall of the existing pipe; a step of measuring a clearance between the end of the rehabilitating pipe in the pipe making process and the inner wall by a clearance measuring tool provided on the pipe making device; a step of controlling a pipe diameter of the rehabilitated pipe based on the clearance measurement value; A pipe rehabilitation method comprising:

8. A pipe rehabilitation method as claimed in claim 7, wherein the clearance is measured each time the pipe manufacturing apparatus is positioned at the top of the existing pipe.

9. After the pipe production is completed up to a predetermined position just before the cross-sectional displacement portion of the existing pipe, the pipe is produced so that the diameter of the rehabilitated pipe is reduced, and the clearance is measured; A pipe rehabilitation method according to claim 7, wherein the pipe is manufactured so that the diameter of the rehabilitated pipe is expanded after the pipe has passed through the cross-sectional deformation portion.

10. As the belt-shaped member, a belt-shaped member having rigidity that enables the rehabilitation pipe to become a self-supporting pipe is used, The pipe rehabilitation method according to any one of claims 7 to 9, wherein in the pipe manufacturing process, the rehabilitated pipe is manufactured so as to adhere to the inner wall.

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