Lining method for existing pipes

Abstract

To provide a lining method for an existing pipe capable of preventing poor adhesion of a rehabilitated pipe to an inner peripheral surface of the existing pipe and occurrence of buckling.SOLUTION: In a lining method for an existing pipe 50, in which a rehabilitating pipe 10 is sequentially attached to an inner peripheral surface of the existing pipe 50 from an other end in an axial direction toward one end in an axial direction by pulling out a cutting wire W to weaken a joint strength of a joint and feeding a profile P into the other end of the existing pipe 50 in an axial direction while twisting the one end of the rehabilitation pipe 10 in the axial direction to expand a part of the rehabilitation pipe 10 whose joint strength has been weakened, after feeding the rehabilitation pipe 10 which consists of joining end edges of the spirally wound profile P, from one end of the existing pipe 50 in the axial direction to the other end in the axial direction while forming the pipe smaller in diameter than the existing pipe 50, a ratio Vp:Vw between a feed speed Vp of the profile P due to torsion of one end of the profile P in the axial direction and a take-up speed Vw of the cutting wire W is controlled so that a length of a cone part of the rehabilitation pipe is within an appropriate range.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a lining method for existing pipes such as sewer pipes buried in the ground.

Background Art

[0002] When an existing pipe such as a sewer pipe buried in the ground deteriorates, a lining method for rehabilitating the existing pipe by lining the inner peripheral surface of the existing pipe without excavating the existing pipe from the ground is known and has already been put into practical use.

[0003] In the lining method (expander pipe manufacturing method) disclosed in Patent Document 1, a spiral tubular rehabilitation pipe formed by spirally winding a flexible resin strip-shaped profile and joining the edges of adjacent profiles is manufactured to have a smaller diameter than the existing pipe, and is fed from one axial end side (starting side) of the existing pipe to the other axial end side (arrival side).

[0004] Then, by pulling a cutting wire interposed at the joint between the edges of adjacent profiles in the width direction of the profile from the other axial end side of the rehabilitation pipe toward the one axial end side, a part of the joint of the profile is sequentially cut along the winding direction of the profile to weaken the bonding force of the joint. At the same time, while manufacturing the profile into a rehabilitation pipe with a smaller diameter and feeding it to the other axial end side of the existing pipe, the one axial end side of the rehabilitation pipe is twisted to expand the portion where the bonding force of the rehabilitation pipe is weakened, and the rehabilitation pipe is sequentially attached to the inner peripheral surface of the existing pipe from the other axial end side to the one axial end side, thereby lining the inner peripheral surface of the existing pipe with the rehabilitation pipe.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the above lining method, a tapered cylindrical cone is formed inside the existing pipe between the large-diameter portion that has already expanded and adhered to the inner surface of the existing pipe during the diameter expansion of the rehabilitation pipe, and the small-diameter portion that has not yet expanded. However, if the axial length (cone length) of this cone portion is not appropriate, the following problems may occur.

[0007] In other words, if the cone portion of the rehabilitated pipe is too long, the power from the pipe-making machine will not be transmitted to the large-diameter end of the cone portion of the existing pipe. As a result, the front part of the cone portion will stick to the inner surface of the existing pipe first, while the middle part of the cone portion will not stick, causing poor sealing of the rehabilitated pipe.

[0008] Conversely, if the length of the cone portion of the rehabilitation pipe is too short, buckling will occur. In other words, where the cutting wire of the rehabilitation pipe has come off, adjacent rings of the profile slide relative to each other in the circumferential direction and try to stick to the inner surface of the existing pipe. However, where the cutting wire has not come off, the rings of the profile cannot slide to each other, resulting in a difference in diameter at that point, and a defect called buckling occurs, in which the joint (fitting part) between adjacent rings breaks.

[0009] The present invention has been made in view of the above problems, and its purpose is to provide a lining method for existing pipes that can prevent poor adhesion of the rehabilitated pipe to the inner surface of the existing pipe and the occurrence of buckling by maintaining the appropriate length of the cone portion of the rehabilitated pipe. [Means for solving the problem]

[0010] To achieve the above objective, the present invention involves winding a strip-shaped profile in a spiral shape and joining adjacent edges of the profiles via a cutting wire to produce a spiral-shaped rehabilitated pipe with a smaller diameter than the existing pipe. While feeding the pipe from one axial end to the other axial end of the existing pipe, the cutting wire is pulled back from the other axial end to the one axial end of the rehabilitated pipe, thereby sequentially cutting a portion of the joint of the profile along the winding direction of the profile, thereby weakening the joining force of the joint, and the profile A lining method for an existing pipe, comprising sending a file to manufacture a small-diameter rehabilitated pipe and feeding it to the other axial end of the existing pipe, while twisting the axial end of the rehabilitated pipe to expand the diameter of the portion of the rehabilitated pipe where the joint force has weakened, thereby sequentially attaching the rehabilitated pipe to the inner surface of the existing pipe from the other axial end to the axial end, characterized in that the speed ratio Vp:Vw of the feed speed Vp of the profile and the pull-out speed Vw of the cutting wire when expanding the diameter of the rehabilitated pipe is controlled so that the length of the cone portion of the rehabilitated pipe falls within an appropriate range. This construction method allows the length of the cone portion during the diameter expansion of the rehabilitation pipe to be kept within an appropriate range, thereby preventing poor adhesion of the rehabilitation pipe to the inner surface of the existing pipe due to the cone portion being too long, and preventing buckling due to the cone portion being too short.

[0011] In one embodiment, if the inner diameter of the existing pipe is d0 and the outer diameter of the rehabilitated pipe at the time of manufacture is d1, the speed ratio Vp:Vw of the feed rate Vp of the profile and the take-up rate Vw of the cutting wire when the rehabilitated pipe is expanded is brought close to (d0-d1):d0.

[0012] Preferably, the target range for the length of the cone portion is set to the appropriate range, and when the rehabilitated pipe is enlarged, the length of the cone portion of the rehabilitated pipe is monitored, and the speed ratio Vp:Vw is controlled so that the monitored length of the cone portion falls within the target range. This construction method allows for precise control of the cone section's length while monitoring it on a screen, ensuring that the cone's length remains within the target range within the set range. The target range can be equal to or narrower than the set range.

[0013] Preferably, the system includes control means and operating means, the control means controlling the feed rate Vp of the profile and the take-up rate Vw of the cutting wire at a predetermined speed ratio, and when the monitored length of the cone portion reaches near the limit of the target range or falls outside the target range, the control means, in response to operation of the operating means, changes the feed rate Vp of the profile or the take-up rate Vw of the cutting wire to temporarily change the speed ratio Vp:Vw, thereby bringing the length of the cone portion within the target range. According to this construction method, the control means basically control at a constant speed ratio, and the speed ratio is temporarily changed by operating the operating means, thus simplifying the control process.

[0014] In one embodiment, if the cone portion is near the lower limit of the target range or shorter, the take-up speed Vw of the cutting wire is increased or the feed speed Vp of the profile is decreased; if the cone portion is near the upper limit of the target range or longer, the take-up speed Vw of the cutting wire is decreased or the feed speed Vp of the profile is increased.

[0015] In another embodiment, the control means maintains a constant feed rate Vp of the profile, increases the pull-up rate Vw of the cutting wire by operating the operating means when the cone portion is near the lower limit of the target range or shorter than the target range, and decreases the pull-up rate Vw of the cutting wire when the cone portion is near the upper limit of the target range or longer than the target range. This method allows for stable pipe manufacturing of rehabilitated pipes by only increasing or decreasing the pull-up speed of the cutting wire while maintaining a constant feed speed of the profile.

[0016] Preferably, the predetermined speed ratio Vp:Vw is set such that the pull-up speed Vw of the cutting wire is lower than a reference ratio (d0-d1):d0, where d0 is the inner diameter of the existing pipe and d1 is the outer diameter of the rehabilitated pipe when it is manufactured. The control means, while expanding the diameter of the rehabilitated pipe, maintains a constant feed rate Vp of the profile and controls with the predetermined speed ratio Vp:Vw so that the length of the cone portion gradually decreases. When the length of the cone portion reaches near the lower limit of the target range or becomes shorter than the target range, the pull-up speed Vw of the cutting wire is temporarily increased in response to the operation of the operating means. This method simplifies speed adjustment because it only requires increasing the pull-up speed of the cutting wire. Furthermore, since the profile feed speed is kept constant, rehabilitated pipes can be manufactured stably.

[0017] The appropriate range for the length of the cone portion of the rehabilitation pipe is 10 to 25 times the width of the profile.

[0018] The feed rate Vp of the profile when the rehabilitated pipe is enlarged is determined from the rotational speed of the rollers of the pipe-making machine that manufactures the rehabilitated pipe, and the take-up rate Vw of the cutting wire is determined from the rotational speed of the pulley of the wire take-up machine that takes up the cutting wire. According to this method, the profile feed rate Vp can be accurately measured from the rotation speed of the pipe-making machine's rollers, and the wire-cutting wire take-up rate Vw can be accurately measured from the rotation speed of the wire-pulley machine's pulley. [Effects of the Invention]

[0019] According to the present invention, the length of the cone portion during the diameter expansion of the rehabilitation pipe can be kept within an appropriate range, thereby preventing poor adhesion of the rehabilitation pipe to the inner surface of the existing pipe due to the cone portion being too long, and preventing buckling due to the cone portion being too short. [Brief explanation of the drawing]

[0020] [Figure 1] It is a longitudinal sectional view showing a state where the pipe manufacturing of the rehabilitation pipe in the lining method according to the present invention and the process of feeding the rehabilitation pipe into the existing pipe are completed. [Figure 2] It is an enlarged sectional perspective view of part A in FIG. 1. [Figure 3] It is a longitudinal sectional view showing the diameter expansion process of the rehabilitation pipe in the lining method according to the present invention. [Figure 4] It is a longitudinal sectional view showing the diameter expansion process of the rehabilitation pipe in the lining method according to the present invention. [Figure 5] It is an enlarged sectional perspective view of part B in FIG. 3. [Figure 6] It is an enlarged detailed view of part C in FIG. 4. [Figure 7] It is a longitudinal sectional view showing a state where the inner peripheral surface of the existing pipe is lined by the lining method according to the present invention. [Figure 8] It is an enlarged sectional view taken along line D-D in FIG. 7. [Figure 9] It is a diagram schematically showing a system for controlling the feeding speed of the profile and the take-up speed of the cutting wire in the lining method according to the present invention.

Embodiments for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. As shown in FIG. 1, an existing pipe 50 such as an aging sewer pipe is buried substantially horizontally in the ground, and both axial ends (the left - right direction in FIG. 1) of this existing pipe 50 are respectively open to manholes 51, 52 that open to the ground. In the following description, one axial end side (the left - hand side in FIG. 1) of the existing pipe 50 is referred to as the "starting side", and the other axial end side (the right - hand side in FIG. 1) is referred to as the "arrival side".

[0022] A push-type pipe-making machine 20 is installed at the bottom of the manhole 51 on the launching side, and a drum 60 on which a strip-shaped profile P made of synthetic resin, which is a lining material (rehabilitation material), is wound is installed near the manhole 51 on the ground (on the launching side). As will be described later, the profile P wound on the drum 60 is fed towards the pipe-making machine 20 in the direction of the arrow shown in the figure.

[0023] Furthermore, a wire feed roll (not shown) is provided near the manhole 51 on the ground for feeding the cutting wire W toward the pipe-making machine 20. The cutting wire W is made of a metal wire such as steel wire, which has a higher tensile strength than resin, and the profile P is made of a flexible synthetic resin such as polyvinyl chloride, polyethylene, polypropylene, polycarbonate, or polyester.

[0024] Furthermore, a wire retriever 30 for retrieving the cutting wire W is provided near the manhole 51 on the ground. Although Figures 1, 3, and 4 show the wire retriever 30 as being installed inside the manhole 51, in reality, it is installed near the manhole 51 on the ground, as described above.

[0025] Next, the procedure for the lining method for existing pipes 50 according to the present invention will be described below. When lining the existing pipe 50, the pipe-making process of the rehabilitated pipe 10 is first initiated by the pipe-making machine 20. In this process, the pipe-making machine 20 shown in Figure 1 is driven, and the profile P wound on the drum 60 on the ground is sequentially fed into the pipe-making machine 20 in the direction of the arrows shown in the figure, while the cutting wire W is sequentially fed into the pipe-making machine 20 from a wire feed roll (not shown). The pipe-making machine 20 then spirally winds the profile P, joining the edges of adjacent profiles P in the width direction, and incorporates the cutting wire W into this joint to produce a cylindrical rehabilitated pipe 10.

[0026] Here, the details of the joining structure between adjacent edges in the width direction of the profile P that constitute the rehabilitation pipe 10 and the structure for incorporating the cutting wire W into the joint will be explained based on Figure 2.

[0027] As shown in Figure 2, the strip-shaped profile P has two parallel fitting protrusions 1 and 2 on the outer circumference of one end edge, and two parallel protrusions 3 and 4 on the outer circumference of the other end edge. Fitting grooves 3a and 4a are formed in these protrusions 3 and 4, respectively. When the profile P is wound, the adjacent ends of the profile P overlap, and the fitting protrusions 1 and 2 fit into the fitting grooves 3a and 4a of the protrusions 3 and 4, respectively, thereby joining the adjacent ends of the profile P in the width direction. As the profile P is wound and its edges are joined together, the rehabilitated pipe 10 is formed into a cylindrical shape with numerous wound sections P1 (a helical section that completes one full turn). Figure 2 shows a magnified view of the joined edges of adjacent wound sections P11 and P12 of the rehabilitated pipe 10.

[0028] As shown in Figure 2, a recess 5 is formed between two fitting protrusions 1 and 2 on the outer circumference of one edge of profile P, and a flange portion 6 that fits into this recess 5 is formed on the other edge. With the cutting wire W housed in the semicircular engaging recess 6a formed on the inner surface of this flange portion 6, the edges of profile P are joined together as described above, thereby spirally incorporating the cutting wire W into the joint of the adjacent edges of profile P.

[0029] As described above, the rehabilitated pipe 10 is a cylindrical member with a smaller diameter than the inner diameter of the existing pipe 50, as shown in Figure 1, and the cutting wire W is wound spirally inside it as previously mentioned. The rehabilitated pipe 10 is then sequentially inserted into the existing pipe 50 from the starting side to the destination side by the pipe-making machine 20. During this pipe-making process, the rehabilitated pipe 10 receives torque from the pipe-making machine 20, causing it to rotate around its axis as it moves towards the destination side.

[0030] The wire pull-up wire wound on the wire pull-up machine 30 is connected to the cutting wire W at the tip of the rehabilitated pipe 10 during the initial stages of pipe manufacturing. As the rehabilitated pipe 10 moves toward the destination, the pull-up wire is also pulled out from the wire pull-up machine 30. In Figure 1, this pull-up wire is denoted by the same symbol W as the cutting wire.

[0031] Then, as shown in Figure 1, when the leading edge of the rehabilitation pipe 10 reaches the receiving end of the existing pipe 50, and the rehabilitation pipe 10 is inserted along the entire length of the existing pipe 50, the leading edge of the rehabilitation pipe 10 protruding from the receiving end opening of the existing pipe 50 is fixed so as not to rotate relative to the existing pipe 50. This fixing of the leading edge of the rehabilitation pipe 10 is done, for example, by passing a bar radially through the leading edge of the rehabilitation pipe 10.

[0032] Next, the expansion of the rehabilitated pipe 10 and its attachment to the inner surface of the existing pipe 50 is sequentially started from the tip (reach side) toward the departure side. This attachment of the rehabilitated pipe 10 to the inner surface of the existing pipe 50 due to its expansion is performed as shown in Figure 3 by rotating the wire take-up machine 30 in the direction of the arrow (counterclockwise) to take the cutting wire W at speed Vw toward the departure side (direction of the arrow in Figure 3), and at the same time, the profile P is fed from the drum 60 to the pipe-making machine 20 at speed Vp, and the cutting wire W is fed from the wire feed roll, thereby producing a small-diameter rehabilitated pipe 10 as described above. Along with this pipe production, the departure side portion (unexpanded portion) of the rehabilitated pipe 10 is twisted in the direction of the arrow (direction in which the rehabilitated pipe 10 expands).

[0033] As described above, when the cutting wire W is pulled in the direction of the arrow in Figure 3 (to the left), as shown in Figure 5, at the joint of the spiral profile P1 (P11, P12) adjacent to each other in the width direction of the spiral profile P that constitutes the rehabilitated pipe 10, one of the fitting projections 1 of the spiral profile P11 is cut by the cutting wire W, thus weakening the joint force. At the same time, when the starting end of the rehabilitated pipe 10 is twisted by the pipe-making machine 20 in the direction of the arrow in Figure 3, relative slippage occurs in the circumferential direction at the joint where the joint force has been weakened between the spiral profiles P11 and P12 adjacent to each other in the width direction of the profile P. As a result, the area where the relative slippage of the rehabilitated pipe 10 occurs (the cut location of the fitting projection 1) expands in diameter and adheres to the inner surface of the existing pipe 50. Note that it is necessary to feed the profile P into the rehabilitated pipe 10 by the amount of the increase in the circumferential length (perimeter) of the profile P due to the expansion of the diameter of the rehabilitated pipe 10, so the profile P is fed into the rehabilitated pipe 10 by the pipe-making machine 20 as described above.

[0034] As the above-described diameter expansion process progresses, as shown in Figure 4, the expansion of the rehabilitated pipe 10 causes it to adhere (line) to the inner surface of the existing pipe 50, and this adhesion occurs sequentially from the arrival side to the departure side. At this time, a tapered cylindrical cone portion 10c is formed in the rehabilitated pipe 10, which gradually decreases in diameter toward the departure side, between the large-diameter portion 10a that has already expanded and adhered to the inner surface of the existing pipe 50 and the small-diameter portion 10b that has not yet expanded. If the length (axial length) L of the cone portion 10c is not appropriate, the problems described above will occur. Specifically, if the length L of the cone portion 10c of the rehabilitated pipe 10 is too long, poor adhesion of the rehabilitated pipe 10 to the existing pipe 50 will occur, and conversely, if the length L of the cone portion 10c is too short, a defect called buckling will occur, in which the joint (fitting portion) between adjacent winding portions P1 of the profile P breaks.

[0035] To prevent the above problem from occurring, it has been empirically determined that the length L of the cone portion 10c of the rehabilitation pipe 10 should be maintained within an appropriate range of 10 to 25 times the width b of the profile P (L = (10 to 25)b). This means that the number of winding portions P1 of the profile P present in the cone portion 10c of the rehabilitation pipe 10 is between 10 and 25.

[0036] Here, we will explain the conditions for maintaining the cone length L within a predetermined length within an appropriate range during the diameter expansion process described above. As shown in Figure 6, if the inner diameter of the existing pipe 50 (outer diameter of the large-diameter portion 10a of the rehabilitated pipe 10) is d0 and the outer diameter of the small-diameter portion 10b of the rehabilitated pipe 10 is d1, then the amount of the profile P that needs to be fed to attach one turn portion P1 of the profile P to the inner surface of the existing pipe 50 is (d0-d1)·π. If the same amount of cutting wire W is withdrawn as the amount of the profile P that is fed (d0-d1)·π, the cutting wire W will remain in the same position. In this state, the length L of the cone portion 10c of the rehabilitated pipe 10 has been shortened by the amount of one turn portion P1 of the profile P. Therefore, in order to keep the length L of the cone portion 10c constant, the cutting wire W only needs to be withdrawn by the amount of one turn portion P1 of the profile P (d1·π).

[0037] Therefore, in order to maintain the length L of the cone portion 10c of the rehabilitation pipe 10 at a predetermined length, the ratio Vp:Vw of the feed speed Vp of the profile P and the take-up speed Vw of the cutting wire W should be set as follows. Vp:Vw=(d0-d1)·π:(d0-d1)·π+d1·π =(d0-d1):d0(1)

[0038] Table 1 below shows examples of combinations of the inner diameter d0 (nominal diameter) of the existing pipe 50 and the outer diameter d1 of the small-diameter section 10b of the rehabilitated pipe 10. In Example 1, (d0, d1) is (450 mm, 375 mm), in Example 2 it is (500 mm, 425 mm), in Example 3 it is (600 mm, 500 mm), and in Example 4 it is (700 mm, 600 mm). [Table 1]

[0039] In Examples 1 to 4, if the existing pipe 50 is not corroded and its inner diameter remains the same as the nominal diameter, the speed ratio Vp:Vw required to maintain the cone member 10c at a predetermined length can be theoretically obtained by substituting d0 and d1 into equation (1), as shown in column A of Table 1. That is, the speed ratio Vp:Vw (theoretical value) is (1:6) in Example 1, (1:6.66) in Example 2, (1:6) in Example 3, and (1:7) in Example 4. By controlling with this speed ratio, the length of the cone portion 10c can theoretically be maintained at a constant length within an appropriate range.

[0040] If the inner surface of the existing pipe 50 is corroded, the inner diameter d0 is larger than the nominal diameter. If the corrosion involves a diameter expansion of more than 10 mm, the existing pipe 50 is not subject to lining, so this expansion is a maximum of 10 mm. By adding this 10 mm expansion to the nominal diameter of the existing pipe 50 in Examples 1 to 4, the inner diameter d0 of the existing pipe 50 can be determined, and by calculating the speed ratio Vp:Vw from this inner diameter d0 using equation (1), the values ​​shown in column B of Table 1 are obtained. That is, Vp:Vw is (1:5.41) in Example 1, (1:6) in Example 2, (1:5.54) in Example 3, and (1:6.45) in Example 4. The speed ratio in column B is smaller than the speed ratio in column A (the take-up speed Vw of the cutting wire W is lower). If the existing pipe 50 has expanded in diameter by 10 mm due to corrosion, theoretically, by controlling it with this rate ratio, the length of the cone section 10c can be maintained at a constant length within an appropriate range.

[0041] Here, the configuration of the system for adjusting the length L of the cone portion 10c of the rehabilitation pipe 10 will be explained based on Figure 9. In Figure 9, 7 is a television camera (imaging means) that moves autonomously inside the rehabilitation pipe 10 and captures images of the internal conditions of the rehabilitation pipe 10. The images captured by this television camera 7 are displayed on a monitor device 8, such as a display. The pipe-making machine 20 is also equipped with a roller 22 that is rotationally driven by a hydraulic motor 21 to feed out the profile P, and a rotation sensor 23 is provided near the roller 22 to detect the rotation speed of the roller 22. The hydraulic unit that supplies hydraulic pressure to the hydraulic motor 21 is not shown. Here, an electric motor can also be used instead of the hydraulic motor 21.

[0042] The detection signal from the rotation sensor 23 is transmitted to the control panel 100, where the feed rate Vp of profile P, calculated from the rotation speed of the roller 22, is displayed.

[0043] Furthermore, the wire pull-up machine 30, which takes up the cutting wire W, is equipped with a pulley 32 that is rotationally driven by a hydraulic motor 31, and a rotation sensor 33 for detecting the rotational speed of the pulley 32 is provided near the pulley 32. Note that the hydraulic unit that supplies hydraulic pressure to the hydraulic motor 31 is not shown. Here, an electric motor may be used instead of the hydraulic motor 31.

[0044] The detection signal from the rotation sensor 33 is transmitted to the control panel 100, where the wire pull-up speed Vw of the cutting wire W, calculated by the rotation speed of the pulley 32, is displayed.

[0045] A foot pedal 110 (speed adjuster; operating means) for adjusting the pulling speed Vw of the cutting wire W is connected to the control panel 100.

[0046] Next, we will explain the control system in Figure 9 for adjusting the length L of the cone portion 10c of the rehabilitation pipe 10 and maintaining it within the appropriate range. In this embodiment, during the diameter enlargement process of the rehabilitation pipe 10, the control panel 100 controls the feed rate Vp of the profile P to a constant rate, for example, 3 m / min. The speed ratio Vp:Vw set in the control panel 100 is set to be smaller than the speed ratios in column A and column B. Specifically, the wire pull-up speed Vw of the cutting wire W is reduced by 0.7 or more compared to the speed ratio in column A. For example, the field setting value is set to the speed ratio Vp:Vw shown in column C of Table 1. The speed ratio shown in column C of Table 1 is such that the wire pull-up speed Vw of the cutting wire W is reduced by approximately 1 compared to the speed ratio in column A of Table 1. In other words, the control panel 100 controls the speed ratio Vp:Vw to be (1:5) in Example 1, (1:5.6) in Example 2, (1:5) in Example 3, and (1:6) in Example 4. For example, in Example 1, the wire pull-up speed Vw of the cutting wire W is controlled to be 15 m / min. The control panel 100 performs feedback control based on the rotation speed information from the rotation sensors 23 and 33 to achieve the predetermined speed ratio.

[0047] If the pull-up speed Vw of the cutting wire W is controlled at a constant speed to maintain the speed ratio in column C of Table 1 above, the length L of the cone portion 10c of the rehabilitated pipe 10 will gradually decrease, not only when the existing pipe 50 is maintained at its nominal diameter, but also when it has been expanded to its maximum diameter of 10 mm due to corrosion.

[0048] The operator counts the number of wound portions P1 in the cone portion 10c of the rehabilitation pipe 10 from the image displayed on the monitor device 8, and compares the counted number of wound portions P1 with a set target range. When light is shone into the inside of the rehabilitation pipe 10 from the receiving end, only the inner surface of the cone portion 10c is brightly illuminated, so the number of wound portions P1 can be counted. Alternatively, a trolley equipped with a television camera may be driven inside the cone portion 10c to count the number of wound portions P1. The target range mentioned above is within the appropriate range (10b to 25b), and may be the same as the appropriate range, but it is preferable to set it to a narrower range (for example, L = 15b to 18b).

[0049] When the length of the cone portion 10c (number of windings of profile P) displayed on the monitoring device 8 reaches near the lower limit of the target range or becomes shorter, the foot pedal 110 is pressed. This sends an operation signal (speed increase command) from the foot pedal 110 to the control panel 100. In response to this speed increase command, the control panel 100 controls the hydraulic motor 31 to increase the wire pulling speed Vw. This temporarily increases the speed ratio Vp:Vw, and the length L of the cone portion 10c increases. When the length L of the cone portion 10c reaches near the upper limit of the target range, the operator stops pressing the foot pedal 110. This returns the control panel 100 to the original speed ratio (the speed ratio listed in column C of Table 1), and the length L of the cone portion 10c gradually decreases again. In this way, the length L of the cone portion 10c repeatedly shortens and lengthens, remaining approximately within the target range. As a result, poor adhesion of the rehabilitated pipe 10 to the existing pipe 50 and buckling can be reliably prevented.

[0050] As described above, by keeping the feed rate Vp of the profile P involved in pipe manufacturing constant and controlling only the take-up rate Vw of the cutting wire W, the rehabilitated pipe 10 can be manufactured stably during the diameter expansion process. The length L of the cone section 10c can be adjusted with a simple operation (for example, by pressing the foot pedal 110) by operating the wire pull-up speed Vw only in the speed-increasing direction. Since the operator adjusts the wire pull-up speed Vw based on the lower limit of the target range of the length of the cone section 10c, it is easy to count the number of profiles P in the cone section 10c using the video from the television camera 7, and the wire pull-up speed Vw can be adjusted accurately.

[0051] In the adjustment process described above, the length L of the cone portion 10c fluctuates within the target range, but the average value is approximately equal to a predetermined value within the target range, such as the center value. As a result, the average value of the fluctuating velocity ratio Vp:Vw is close to the velocity ratio Vp:Vw obtained by substituting the actual average value of the inner diameter corresponding to the corrosion status of the existing pipe 50 into equation (1).

[0052] As described above, in a control method that operates only in the speed-increasing direction, the speed ratio Vp:Vw can be made even smaller than the speed ratio shown in column C of Table 1, and in principle it can be made 1:1. However, if this speed ratio is too small, the length L of the cone section 10c decreases significantly, requiring frequent increases in the speed of the cutting wire W's pull-up speed Vw, which can lead to problems such as wire breakage or buckling due to the continuation of pipe-making work after wire breakage. To avoid these problems, the minimum value of the speed ratio Vp:Vw should be the value obtained by halving the speed of the cutting wire W's pull-up speed Vw compared to the speed ratio in column A of Table 1, or by subtracting "3". Examples of speed ratios close to the minimum value mentioned above (where the wire pull-up speed Vw is slightly less than 60% of the speed ratio in column A) are shown in column D of Table 1. Specifically, the speed ratio Vp:Vw is (1:3.5) in Example 1, (1:3.83) in Example 2, (1:3.5) in Example 3, and (1:4) in Example 4.

[0053] The control panel 100 may also be controlled by the speed ratio Vp:Vw shown in column B of Table 1. In this case, if the existing pipe 50 has expanded in diameter by exactly 10 mm due to corrosion, the length of the cone portion 10c will hardly change, so there is little need to adjust the pull-up speed Vw of the cutting wire W. If the corrosion of the existing pipe 50 is slight and the expansion in diameter is less than 10 mm, the cone portion 10c will gradually shorten as control continues, so it is necessary to increase the pull-up speed Vw of the cutting wire W. When controlling with the speed ratio Vp:Vw in column B of Table 1, if the corrosion of the existing pipe 50 has progressed more than expected and the diameter has expanded to a maximum of 10 mm, the cone portion 10c will gradually lengthen, so it will be necessary to reduce the pull speed Vw of the cutting wire W. Therefore, when using the speed ratio in column B of Table 1, it is preferable to use a speed adjuster (operating means) that can adjust in both directions of speed increase and speed decrease instead of the foot pedal 110.

[0054] The control panel 100 may be controlled using the speed ratio Vp:Vw shown in column A of Table 1. In this case, if there is no corrosion in the existing pipe 50, the cone portion 10c will remain almost constant even if the control is continued, and there will be no need to adjust the wire pull-up speed Vw of the cutting wire W. If there is corrosion in the existing pipe 50, the pipe 50 will be enlarged, and the cone portion 10c will gradually lengthen as the enlargement process continues. Therefore, it is necessary to reduce the pull-up speed Vw. Furthermore, if the actual inner diameter d0 of the existing pipe 50 is larger than the nominal diameter, the cone portion 10c will gradually shorten as the enlargement process continues, and it is necessary to increase the pull-up speed Vw. Therefore, when using the speed ratios shown in column A of Table 1, it is preferable to use a speed adjuster (operating means) that can adjust in both directions of increasing and decreasing speed.

[0055] The control panel 100 may be controlled with a speed ratio greater than the speed ratio Vp:Vw in column A of Table 1. In this case, as the diameter expansion process continues, the cone portion 10c will gradually become longer, so it is necessary to use a speed regulator (operating means) that can reduce the take-up speed Vw.

[0056] In the control method described above, the feed rate Vp of profile P is kept constant, but this feed rate Vp may be made adjustable. That is, in addition to a speed regulator for adjusting the take-up rate Vw of the cutting wire W, or in place of the speed regulator, a speed regulator for adjusting the feed rate Vp of profile P may be connected to the control panel 100. In this case, when the length L of the cone portion 10c of the rehabilitation pipe 10 is shorter than the target range, the take-up rate Vw of the cutting wire W is increased, or the feed rate Vp of profile P is decreased. Also, when the length L of the cone portion 10c is longer than the target range, the take-up rate Vw of the cutting wire W is decreased, or the feed rate Vp of profile P is increased. A braking means such as a brake device may be used as the operating means for the deceleration operation.

[0057] As shown in Figure 7, when the rehabilitated pipe 10 is expanded in diameter along the entire length of the existing pipe 50 and adheres to the inner surface of the existing pipe 50 along its entire length, the series of lining operations on the existing pipe 50 is completed.

[0058] Furthermore, if the manhole is small, it is necessary to shorten the length L of the cone portion 10c near the starting pipe opening. Therefore, the above process may be terminated when the diameter expansion of the rehabilitation pipe 10 is almost complete along the entire length of the existing pipe 50, specifically when there is an area within 5m of the starting pipe opening where the rehabilitation pipe is not attached to the existing pipe. After the above process is completed, the diameter is expanded while shortening the length L, and once it has been attached near the pipe opening, the profile is cut, and the diameter is expanded and attached manually up to the pipe opening.

[0059] After the above series of steps have been completed and the lining of the existing pipe 50 with the rehabilitation pipe 10 is finished, as shown in Figures 7 and 8, the deteriorated existing pipe 50 is rehabilitation by having its inner surface lined with the rehabilitation pipe 10 along its entire length.

[0060] Here, the feed rate Vp of profile P can be accurately measured from the rotational speed of the roller 22 of the pipe-making machine 20, and the take-up rate Vw of the cutting wire W can be accurately measured from the rotational speed of the pulley 32 of the wire take-up machine 30.

[0061] The above describes a lining method in which workers perform tasks offline at the construction site. However, by replacing the control panel 100 shown in Figure 9 with an ECU (Electronic Control Unit), the work can be performed online and remotely automatically, which is expected to lead to labor savings and cost reductions.

[0062] Furthermore, the present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the technical idea described in the claims, specification, and drawings.

[0063] In Examples 1-4 of Table 1, the nominal diameter d0 of the existing pipe 50 was used, but the measured inner diameter may be used instead. In this case, for example, the horizontal and vertical inner diameters of the existing pipe 50 near the pipe end are measured, and the average value is used as the inner diameter. Alternatively, the inner diameter of the existing pipe 50 may be determined by 3D measurement using a laser or estimation from images from a television camera. The outer diameter d1 of the rehabilitation pipe 10 may also be a measured value. In this case, the horizontal and vertical inner diameters are measured at the end of the rehabilitation pipe 10 on the pushing side, the average value of which is used to determine the inner diameter, and the thickness of the rehabilitation pipe 10 is added to this inner diameter to obtain the outer diameter d1. Alternatively, the outer circumference of the end of the rehabilitation pipe 10 may be measured, and the outer diameter d1 may be obtained by dividing this outer circumference by π. A button may be used instead of a foot pedal as the means of operation (speed adjustment).

[0064] After the rehabilitation pipe 10 has been inserted along the entire length of the existing pipe 50, the pulling wire pulled out from the wire pulling machine 30 and the cutting wire W incorporated into the joint of the rehabilitation pipe 10 may be connected at the tip of the rehabilitation pipe 10. In this case, the pulling wire may be extended to the destination by a remote-controlled transport vehicle, or, if the rehabilitation pipe is passable by a person, the worker may extend it to the destination. [Explanation of symbols]

[0065] 7. Television camera (imaging means) 8. Monitoring device 10 Rehabilitation pipe 10a Large diameter section of the rehabilitation pipe 10b Small diameter section of the rehabilitation pipe 10c Rehabilitation pipe cone 20 Pipe making machine 22 Rollers of pipe making machine 23 Rotation sensor for pipe making machine 30 Wire Pulling Machine 32. Pulley for wire pull-up machine 33. Rotation sensor for wire pull-up device 50 Existing pipes 100 Control panel (control means) 110 Foot pedal (speed adjuster; operating means) L Length of the cone portion of the rehabilitation pipe P Profile P1 Profile winding section Vp profile feed rate VW wire retrieval speed W Cutting Wire

Claims

1. A spiral-shaped rehabilitated pipe with a smaller diameter than the existing pipe is manufactured by winding a strip-shaped profile in a spiral shape and joining the edges of adjacent profiles via a cutting wire, while feeding the pipe from one axial end to the other axial end of the existing pipe, A lining method for existing pipes, wherein the cutting wire is pulled from the other axial end of the rehabilitation pipe toward the one axial end, thereby sequentially cutting a portion of the joint of the profile along the winding direction of the profile and weakening the joint force of the joint, and while feeding the profile and forming the small-diameter rehabilitation pipe and feeding it toward the other axial end of the existing pipe, the one axial end of the rehabilitation pipe is twisted to expand the diameter of the portion of the rehabilitation pipe whose joint force has been weakened, thereby sequentially attaching the rehabilitation pipe to the inner surface of the existing pipe from the other axial end toward the one axial end, The system comprises control means and operating means, the control means being configured to control the feed rate Vp of the profile and the take-up rate Vw of the cutting wire, The target range for the length of the cone portion is set to an appropriate range, and when the diameter of the rehabilitation pipe is increased, the length of the cone portion of the rehabilitation pipe is monitored. The control means maintains a constant feed rate Vp of the profile, increases the pull-out rate Vw of the cutting wire by operating the operating means when the monitored cone portion is near the lower limit of the target range or shorter than the target range, and decreases the pull-out rate Vw of the cutting wire when the monitored cone portion is near the upper limit of the target range or longer than the target range, thereby controlling the rate ratio Vp:Vw of the feed rate Vp of the profile and the pull-out rate Vw of the cutting wire so that the length of the cone portion falls within the target range.

2. A spiral-shaped rehabilitated pipe with a smaller diameter than the existing pipe is manufactured by winding a strip-shaped profile in a spiral shape and joining the edges of adjacent profiles via a cutting wire, while feeding the pipe from one axial end to the other axial end of the existing pipe, A lining method for existing pipes, wherein the cutting wire is pulled from the other axial end of the rehabilitation pipe toward the one axial end, thereby sequentially cutting a portion of the joint of the profile along the winding direction of the profile and weakening the joint force of the joint, and while feeding the profile and forming the small-diameter rehabilitation pipe and feeding it toward the other axial end of the existing pipe, the one axial end of the rehabilitation pipe is twisted to expand the diameter of the portion of the rehabilitation pipe whose joint force has been weakened, thereby sequentially attaching the rehabilitation pipe to the inner surface of the existing pipe from the other axial end toward the one axial end, The system comprises control means and operating means, the control means being configured to control the feed rate Vp of the profile and the take-up rate Vw of the cutting wire, The target range for the length of the cone portion is set to an appropriate range, and when the diameter of the rehabilitation pipe is increased, the length of the cone portion of the rehabilitation pipe is monitored. The speed ratio Vp:Vw of the feed rate Vp of the profile and the pull-out rate Vw of the cutting wire is given by the inner diameter of the existing pipe as d. ０ , the outer diameter of the rehabilitated pipe at the time of pipe manufacturing is d １ When that happens (d ０ -d １ ): d ０ The speed ratio is set to a predetermined ratio such that the pull-up speed Vw of the cutting wire is lower than the reference ratio represented by the above-mentioned ratio. The control means, when expanding the diameter of the rehabilitated pipe, maintains a constant feed rate Vp of the profile and controls it with a predetermined speed ratio Vp:Vw so that the length of the cone portion gradually decreases, and when the monitored length of the cone portion reaches near the lower limit of the target range or becomes shorter than the target range, the control means temporarily increases the pull-up speed Vw of the cutting wire in response to the operation of the operating means.

3. The lining method for existing pipes according to claim 1 or 2, characterized in that the appropriate range for the length of the cone portion of the rehabilitation pipe is 10 to 25 times the width of the profile.

4. The lining method for existing pipes according to claim 1 or 2, characterized in that the feed rate Vp of the profile when the rehabilitated pipe is enlarged is determined from the rotational speed of the rollers of the pipe-making machine that manufactures the rehabilitated pipe, and the take-up rate Vw of the cutting wire is determined from the rotational speed of the pulley of the wire take-up machine that takes up the cutting wire.

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