Existing pipe rehabilitation method and existing pipe rehabilitation equipment

Abstract

To prevent a pipe making machine from becoming too hot in a method for rehabilitating an existing pipe by using a rehabilitating pipe made by using a main push-type pipe making machine.SOLUTION: There is provided an existing pipe rehabilitation method that uses a main push-type pipe making machine 10 installed in a starting manhole 2 to spirally wind a strip-shaped member 5 and join adjacent side edges that are offset one turn to make a rehabilitation pipe 3, while feeding the rehabilitation pipe 3 from a starting end of an existing pipe 1 toward a destination end, and to spray water onto the pipe making machine 10 to cool down the pipe making machine 10 while the pipe making machine 10 is making the rehabilitation pipe 3. A water-discharge cooling device 20 has a pump 21, a suction pipe 22 connected to a suction port of the pump 21 and sucking in water flowing at a bottom of a starting manhole 2, and a water-discharge pipe 23 connected to a discharge port of the pump 21 and discharging water toward the pipe making machine 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method and equipment for rehabilitating existing pipes such as aging sewer pipes, and in particular to a method and equipment for producing a spiral-shaped rehabilitated pipe using a push-type pipe-making machine installed in a starting manhole. [Background technology]

[0002] Various methods have been adopted to rehabilitate existing pipes, such as aging sewer pipes, by constructing a spiral rehabilitation pipe made of strip-shaped members (profiles) along the inner circumference of the existing pipe.

[0003] Patent Document 1 discloses a method for rehabilitating existing pipes using the so-called expand pipe manufacturing method. Specifically, a push-type pipe manufacturing machine is installed in a manhole on the starting side. Using this pipe manufacturing machine, a strip-shaped member is wound in a spiral shape and adjacent side edges are joined together to produce a spiral-shaped rehabilitated pipe, which is then fed sequentially into the existing pipe. The rehabilitated pipe is manufactured to have a diameter smaller than the inside diameter of the existing pipe.

[0004] During the pipe-making process, a cutting wire is inserted into the joint of the band-shaped member. When the tip (end on the destination side) of the rehabilitating pipe reaches the end on the destination side of the existing pipe, the tip of the rehabilitating pipe is fixed. Then, the cutting wire is withdrawn, sequentially cutting portions of the joint of the band-shaped member along the winding direction to weaken the joint strength. In parallel with this, the pipe-making process is resumed using the pipe-making machine. That is, the band-shaped member is supplied to the starting end of the rehabilitating pipe, and the starting end of the rehabilitating pipe is rotated while the pipe is being made. As a result, adjacent side edges of the band-shaped member slide circumferentially against each other at the joint where the joint strength has been weakened by the partial cutting, and the rehabilitating pipe is gradually expanded in diameter from the destination side to the starting side, and is attached to the inner circumferential surface of the existing pipe. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-126830 Summary of the Invention [Problem to be solved by the invention]

[0006] During the pipe-making process, a pipe-making machine sandwiches a strip-shaped material between an inner drive roller and an outer drive roller and pushes it into the starting end of the rehabilitated pipe after the pipe has been made. As a result, frictional heat generated by contact with the strip-shaped material accumulates in these rollers, causing the temperature to rise, which can lead to thermal deformation of the strip-shaped material at the contact point with the rollers. In particular, dents form in the strip-shaped material at the contact point with the outer drive roller. As a result, the drive rollers are less able to clamp the strip-shaped material, causing the drive rollers to spin freely and preventing pipe making from continuing. Furthermore, the increased temperature of the pipe-making machine increases the load on the machine. [Means for solving the problem]

[0007] In order to solve the above problem, the present invention provides a method for rehabilitating an existing pipe, in which a push-type pipe making machine installed in a starting manhole is used to spirally wind a strip-shaped member and join adjacent side edges that are offset by one revolution to make a rehabilitated pipe, while feeding the rehabilitated pipe from the starting end of the existing pipe to the destination end, and in this method, water is sprayed on the pipe making machine to cool it while it is making the rehabilitated pipe. This method can prevent the band-shaped member from being thermally deformed, allowing the production of rehabilitated pipes to continue and reducing the load on the pipe production machine.

[0008] The pipe making machine includes an inner drive roller and an outer drive roller that clamp the strip-shaped member and push it toward the starting end of the rehabilitation pipe, and during the cooling process of the pipe making machine, it is preferable to spray water primarily onto the inner drive roller and outer drive roller.

[0009] Preferably, the cooling step of the pipe making machine is carried out when the temperature of the pipe making machine or the temperature of the strip-shaped member in the vicinity of the end of the rehabilitating pipe on the starting side exceeds a predetermined temperature.

[0010] Another aspect of the present invention is an existing pipe rehabilitation facility that is installed in a starting manhole, and that produces a rehabilitated pipe by spirally winding a strip-shaped member and joining adjacent side edge portions that are offset by one revolution, while feeding the rehabilitated pipe from the starting end of the existing pipe to the destination end, and The water-discharge cooling device is characterized by having a pump, a suction pipe connected to the suction port of the pump and sucking in water flowing at the bottom of the starting manhole or the bottom of the existing pipe when the pump is driven, and a water-discharge pipe connected to the discharge port of the pump and discharging water toward the pipe making machine when the pump is driven to cool the pipe making machine. According to this configuration, the pipe making machine is cooled using water flowing through the bottom of the starting manhole or the bottom of the existing pipe, so cooling water can be easily obtained.

[0011] The pipe making machine includes inner and outer drive rollers that sandwich the strip-shaped member and push it toward the end of the rehabilitating pipe on the starting side, and a motor that drives the inner and outer drive rollers. Preferably, the pump is driven by the motor. This eliminates the need for a drive source for a water-spraying cooling device.

[0012] Preferably, a temperature sensor is provided to detect the temperature of a specific portion of the pipe making machine or the temperature of a strip-shaped member near the starting end of the rehabilitating pipe, and the pump is activated when the temperature detected by the temperature sensor exceeds a predetermined temperature.

[0013] Preferably, the suction pipe is provided with a strainer to prevent solids from being sucked up, thereby preventing solids from entering the motor or the pipe making machine even when sewage is used to cool the pipe making machine. [Effects of the Invention]

[0014] According to the present invention, the pipe making machine can be prevented from becoming too hot, which prevents thermal deformation of the strip-shaped member and allows the production of rehabilitated pipes to be carried out continuously. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a vertical cross-sectional view showing an existing pipe rehabilitation method and equipment according to one embodiment of the present invention. [Figure 2] FIG. 2 is a front view showing the inner drive roller, outer drive roller, outer periphery regulating roller, and motor of a main-pushing type pipe making machine used in the method and equipment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 shows an aging existing pipe 1 to be rehabilitated. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried underground, but it may also be a water supply pipe, an agricultural water pipe, a gas pipe, a hydroelectric power generation water pipe, a tunnel, etc. One end of the existing pipe 1 is connected to a starting manhole 2, and the other end is connected to a destination manhole (not shown).

[0017] An existing pipe 1 is rehabilitated by lining its inner periphery with a rehabilitation pipe 3. The rehabilitation pipe 3 is manufactured by spirally winding a strip-shaped member 5 (profile) and fitting (joining) side edges of the strips one turn apart. The strip-shaped member 5 in this embodiment is made solely of synthetic resin such as polyvinyl chloride (PVC) or polyolefin, but has multiple hollow portions on the outer periphery, making it highly rigid. The rehabilitation pipe 3 manufactured using this strip-shaped member 5 can be a self-supporting pipe. Note that a strip-shaped member incorporating a metal reinforcing material may also be used.

[0018] <Outline of pipe manufacturing machine> The existing pipe rehabilitation equipment of this embodiment is equipped with a push-type pipe making machine 10 that makes a rehabilitated pipe 3 from a strip-shaped member 5. The pipe making machine 10 is installed at the bottom of the starting manhole 2. As shown in Figure 2, the pipe making machine 10 has left and right motors 11 (hydraulic motors), an inner drive roller 13 and an outer drive roller 14 connected to the motors 11 via a gearbox 12, and outer periphery regulating rollers 15 and 16 arranged above and below the two pairs of drive rollers 13 and 14 and supported by arc-shaped frames 15a and 16a, respectively.

[0019] <Small diameter rehabilitation pipe manufacturing process> A strip-shaped member 5 is sequentially unwound from a drum (not shown) on the ground and supplied to a pipe making machine 10. In the pipe making machine 10, the strip-shaped member 5 is spirally wound and adjacent side edges, offset by one revolution, are joined (fitted together) to sequentially produce a spiral rehabilitating pipe 3. In this pipe making process, the strip-shaped member 5 is sandwiched between an inner drive roller 13 and an outer drive roller 14 and pushed toward the starting end of the rehabilitating pipe 3 that has already been produced. Outer periphery regulating rollers 15 and 16 regulate the outer periphery of the strip-shaped member 5 to maintain its arc shape. In this pipe making process, the rehabilitating pipe 3 is produced to a diameter smaller than the inner diameter of the existing pipe 1. The diameter of the rehabilitating pipe 3 in this embodiment is 300 mm to 1200 mm, preferably 500 mm to 1000 mm. The above pipe manufacturing process involves the rotation of the rehabilitating pipe 3.

[0020] In parallel with the pipe making process, a cutting wire 6 is introduced from a guide roll 7 into a pipe making machine 10 and interposed between the joints of the strip-shaped members 5 .

[0021] In the pipe making process, the rehabilitating pipe 3 made by the main push type pipe making machine 10 is pushed into the existing pipe 1 while being rotated inside the existing pipe 1. This causes the rehabilitating pipe 3 to be extended to the end of the existing pipe 1 on the destination side. When the end of the rehabilitating pipe 3 reaches the end of the existing pipe 1 on the destination side, this pipe making process is completed.

[0022] <Rehabilitation pipe manufacturing process involving diameter expansion> After the above-mentioned pipe manufacturing process for the small diameter rehabilitating pipe 3 is completed, the end of the rehabilitating pipe 3 on the arrival side is prevented from rotating relative to the end of the existing pipe 1 . Next, the cutting wire is pulled strongly toward the starting side, thereby cutting a part of the joint of the strip-shaped member 5 of the rehabilitating pipe 3, and gradually weakening the restraining force of the joint from the arrival side toward the starting side.

[0023] In parallel with the joint weakening process, the main push-type pipe making machine 10 is restarted, and the strip-shaped member 5 is supplied to the starting end of the rehabilitating pipe 3, restarting the production of the rehabilitating pipe 3. This pipe making process involves twisting the starting end of the rehabilitating pipe 3, causing circumferential slippage at the weakened joint of the strip-shaped member 5, expanding the diameter of the rehabilitating pipe 3 and attaching it to the inner surface of the existing pipe 1. In this process, the rehabilitating pipe 3 has a cone-shaped portion where circumferential slippage of the strip-shaped member 5 occurs between the expanded end on the arrival side and the smaller-diameter portion on the starting side. When the expanded portion reaches the starting end of the existing pipe 1, the pipe making process is complete.

[0024] In the two-stage pipe making process described above, the inner drive roller 13 and the outer drive roller 14 sandwich the strip-shaped member 5 and push it into the starting end of the already-made rehabilitating pipe 3, generating frictional heat between them. Frictional heat is also generated between the outer circumferential regulating rollers 15, 16 as the strip-shaped member 5 passes through them while in contact with them. In particular, when the strip-shaped member 5 has high rigidity and the diameter of the rehabilitating pipe 3 is small, as in this embodiment, the strip-shaped member 5 is bent tightly with great force, which makes it easy for frictional heat to be generated. When the rollers 13-16 reach high temperatures due to the accumulation of frictional heat, this can cause problems such as deformation of the strip-shaped member 5 and an increase in the load on the pipe making machine 10.

[0025] The existing pipe rehabilitation equipment of this embodiment is equipped with a water-discharge cooling device 20 to remove frictional heat accumulated in the rollers 13 to 16. This water-discharge cooling device 20 has a pump 21 attached to one of the motors 11 of the pipe making machine 10 and receiving driving force from this motor 11, a suction pipe 22 having one end connected to the suction port of this pump 21 and the other end located at the bottom of the starting manhole 2, and a water-discharge pipe 23 having one end connected to the discharge port of the pump 21 and the other end of which, a water-discharge port 23a, is located above the pipe making machine 10. The suction pipe 22 is equipped with a strainer 24 to prevent solid matter from being sucked in. The water-discharge cooling device 20 further includes a temperature sensor 25. The temperature sensor 25 is installed at a specific location of the pipe making machine 10, for example, at the motor 11, and detects the temperature of the motor 11.

[0026] When the rollers 13-16 reach abnormally high temperatures due to accumulated frictional heat, the temperature of the motor 11 also rises accordingly. The pump 21 controller connects the motor 11 and the pump 21 for power transmission when the temperature detected by the temperature sensor 25 exceeds a predetermined temperature. When the pump 21 is driven, the suction pipe 22 sucks in water from the bottom of the starting manhole 2 and discharges it downward, i.e., toward the pipe making machine 10, from the water discharge outlet 23a of the water discharge pipe 23, thereby cooling the pipe making machine 10. The water discharge outlet 23a is positioned to primarily cool the rollers 13-15. As a result, deformation of the strip-shaped member 5 is prevented, the drive rollers 13 and 14 can continue the pipe making process without idling, and abnormal loads on the pipe making machine 10 are prevented. The water discharge may also be directed at the motor 11 to directly remove heat generated by the operation of the motor 11.

[0027] In this embodiment, the water flowing at the bottom of the starting manhole 2 is used as cooling water, making it easy to procure cooling water. The pump 21 is driven by the motor 11, eliminating the need for a drive source for the water-discharge cooling device 20. A strainer 24 is provided in the suction pipe 22, making it possible to prevent solid matter such as sand and garbage in the sewage from entering the pump 21 or the pipe making machine 10.

[0028] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. The pipe making machine may use inner circumferential restricting rollers instead of outer circumferential restricting rollers to make pipe. In the above embodiment, the expand band method (a method in which a small-diameter rehabilitating pipe is first produced, and then the rehabilitating pipe is expanded and lined on the existing pipe) was adopted, but it is also possible to line the existing pipe directly with a rehabilitating pipe produced by a head-pushing pipe production machine, thereby eliminating the diameter expansion process.

[0029] The temperature sensor may detect the temperature of a part of the pipe making machine other than the motor, for example, the frame of the pipe making machine. When a non-contact temperature sensor is used, it may detect the temperature of the rollers 13-16 or the temperature of the strip-shaped member 5 near the starting end of the rehabilitating pipe 3, for example, the temperature of the strip-shaped member 5 in contact with the rollers 13-16. An alarm may be activated when the temperature sensor detects a temperature exceeding a predetermined temperature, and an operator may operate the pump 21 in response to this alarm. The pump 21 may be driven by a drive source separate from the motor 11 of the pipe making machine 10. The driving of the pump may be controlled by time. The water-spray cooling device may pump up water flowing at the bottom of the existing pipe and spray it onto the pipe making machine. When rehabilitating existing water pipes, the strainer of the water discharge cooling device may be omitted.

[0030] In the above-described embodiment, the water-spraying cooling device 20 is provided, but the pipe making machine may also be cooled by simply having an operator pour water drawn into a container onto the pipe making machine or by pouring tap water from a hose onto the pipe making machine. In this case, it is preferable to pour water primarily onto the rollers 13 to 16, and if possible, to also pour water onto the motor 11. In this embodiment, too, an alarm may be activated to prompt the user to spray water when the temperature detected by the temperature sensor exceeds a predetermined temperature. [Industrial Applicability]

[0031] The present invention can be applied to a technology for rehabilitating existing pipes such as aged sewer pipes. [Explanation of symbols]

[0032] 1 Existing pipes 2 Starting manhole 3 Rehabilitation pipe 5. Belt-shaped member 10. Main push type pipe making machine 11 Motor 13 Inner drive roller 14 Outer drive roller 15,16 Periphery control roller 20 Water cooling system 21 Pump 22 Suction pipe 23 Water pipe 24 strainer 25 Temperature Sensor

Claims

1. In a method for rehabilitating an existing pipe, a push-type pipe making machine is used, which is installed in a manhole on the starting side, to spirally wind a strip-shaped member and join adjacent side edges one turn apart to produce a rehabilitated pipe, while feeding the rehabilitated pipe from the end of the existing pipe on the starting side to the end of the existing pipe on the destination side. A method for rehabilitating an existing pipe, characterized in that water is sprayed onto the pipe making machine to cool it while the pipe making machine is producing the rehabilitated pipe.

2. The method for rehabilitating an existing pipe described in claim 1, characterized in that the pipe making machine includes an inner drive roller and an outer drive roller that clamp the strip-shaped member and push it toward the starting end of the rehabilitated pipe, and during the cooling process of the pipe making machine, water is sprayed primarily onto the inner drive roller and outer drive roller.

3. A method for rehabilitating an existing pipe as described in claim 1, characterized in that a cooling process of the pipe making machine is carried out when the temperature of the pipe making machine or the temperature of the strip-shaped member near the starting end of the rehabilitated pipe exceeds a predetermined temperature.

4. The pipe making machine is installed in the starting manhole, and produces a rehabilitated pipe by spirally winding a strip-shaped member and joining adjacent side edge portions that are offset by one revolution, while feeding the rehabilitated pipe from the starting end of the existing pipe to the destination end, An existing pipe rehabilitation facility comprising a water-discharge cooling device, the water-discharge cooling device comprising: a pump; a suction pipe connected to the suction port of the pump and which, when driven by the pump, sucks in water flowing at the bottom of the starting manhole or the bottom of the existing pipe; and a water-discharge pipe connected to the discharge port of the pump and, when driven by the pump, discharges water toward the pipe making machine to cool the pipe making machine.

5. the pipe making machine includes an inner drive roller and an outer drive roller that sandwich the strip-shaped member and push it toward the end of the rehabilitating pipe on the starting side, and a motor that drives the inner drive roller and the outer drive roller; 5. The existing pipe rehabilitation equipment according to claim 4, wherein the pump is driven by the motor.

6. An existing pipe rehabilitation equipment as described in claim 4, characterized in that it is equipped with a temperature sensor that detects the temperature of a specific portion of the pipe making machine or the temperature of a strip-shaped member near the starting end of the rehabilitation pipe, and that drives the pump when the temperature detected by the temperature sensor exceeds a predetermined temperature.

7. 5. The existing pipe rehabilitation equipment according to claim 4, wherein the suction pipe is provided with a strainer for preventing solid matter from being sucked up.

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