JP4401248B2 - Diagnosis and maintenance method of pipe line by parachute using spiral flow - Google Patents

Description

  The invention of this application relates to a method of diagnostic maintenance of a pipeline by a parachute using a spiral flow. More specifically, the present invention is a new efficient and stable new method for grasping and diagnosing in a complete form without disturbing the current situation in the pipeline, and excavating the portion where the pipeline is blocked by contaminants, solids, etc. The present invention relates to a pipeline diagnosis method and a maintenance method capable of strengthening diagnostic maintenance by a pipeline diagnosis method and a maintenance method.

  Conventionally, various investigations and diagnoses have been performed to grasp the current state for maintenance and maintenance of pipelines, and measures for maintenance have been taken based on the diagnosis results. As a method for diagnosis and maintenance of such a pipeline, the inventors of this application have proposed that the parachute movement using a spiral flow as a fluid, diagnosis by an optical observation device attached to the parachute, and maintenance based on the result. (Patent Document 1).

  This new method has been proven to be excellent in accuracy and efficiency.

  However, in the diagnosis using this spiral flow, an observation device such as a CCD camera is placed behind the parachute's traveling direction, so the parachute that runs in front may disturb the current situation, and it is difficult to accurately grasp the current situation. Has occurred.

  Many of the pipelines that are currently laid have not been maintained for a long time, and some pipes are partially blocked due to adhesion of sludge or rust. The tube in such a semi-occluded state may not be able to pass even if it is pushed with a parachute, or may be difficult to remove, and how to remove such a partially semi-occluded part that is difficult to remove has become an issue.

  It is possible to increase the efficiency of various devices by making the air pressure stronger for diagnosis in the pipeline and opening of the blockage. However, in the parachute delivery using the spiral flow into the pipe line, the air pressure is limited by the spiral flow generator and the pipe diameter, so the force transmitted to the parachute is also limited. Is the current situation. In order to overcome this situation, the power-up of air pressure has become an issue.

  Specifically, in the conventional method of mounting a CCD camera behind the parachute, (1) the rear camera moves up and down due to the speed of the parachute and is not stable, so the image itself is blurred, (2) the parachute is forward Therefore, the front image is blocked and the distant view is not shown. (3) Since the parachute is ahead of the camera, the parachute may disturb the current situation, such as removing sludge, and leave the accurate current status in the video. (4) The parachute pulls the cable that binds the CCD camera, and the bundled cable is tensioned, causing damage to the camera body or causing wire breakage. There were problems and shortcomings such as comes.

  In addition, there are many cases where the pipe line is not maintained for a long period of time, so that solid matter and rust remain in the pipe, and a situation in which the passage of the parachute is prevented occurs.

Furthermore, with regard to the delivery of the parachute by spiral flow, there is a limit to the air pressure depending on the spiral flow generator and the pipe diameter, and in reality, the delivery of the parachute becomes difficult due to protrusions and solid matter adhesion in the pipe, It is necessary to temporarily increase the air pressure. Moreover, attaching a camera or an electric brush to the front portion of the parachute leaves problems such as making the parachute itself heavier.
Japanese Patent No. 3425112

  From the above, the problem to be solved by the invention of this application is that the problem of the method using spiral flow developed by the inventors is solved and further developed, and the flaws and contamination of the pipe line are completely formed. It is to provide a new method for diagnosing and maintaining pipelines that can grasp and maintain the current status, and can open the blockages of pipelines to improve transmission and water flow.

  In order to solve the above-mentioned problems, the invention of this application provides a method of mounting a CCD camera on the front part of a parachute body, and stabilizing the image and preventing the obstacle of the body of this application. The motion of the camera body can be prevented, the image can be prevented from being shaken, the image can be prevented from being interrupted by the parachute, and the current situation can be accurately reflected in the image, and the tension applied to the bundled wires can be avoided.

  Furthermore, the invention of this application provides a method for newly arranging a device for sending a compressed air flow (backup flow) behind the spiral flow generator, and as a support system for stably holding the parachute, the spiral flow and the compressed air flow are provided. The driving force is enhanced by the combined use, thereby completing the system.

  The invention of this application also provides a method of attaching an electric brush to the front part of the parachute, moving the parachute back and forth, and removing it in small increments, so that no solid matter or rust remains in the pipe, To make it easier.

  In short, the invention of this application is a method for grasping the current state of the pipeline and diagnosing the process, and further improving the passage and water flow by opening the closed portion of the pipeline, and is attached to the end of the rope body by spiral flow. The observation part attached to the front part (front end) of the parachute body performs maintenance and diagnosis of the current state of the pipeline, and a solid substance removing device is arranged on the front part of the parachute body to open and close the closed part. It is intended to improve water.

  As described above, according to the invention of this application, by attaching to the front portion of the parachute, the parachute body can always be stably maintained in a swollen state, the camera can be stabilized, and an accurate image can be obtained. In addition, this mounting method helps to maintain the camera itself without the camera body hitting the bottom of the tube, and furthermore, the wire connected to the camera is not subjected to excessive tension, thereby preventing the risk of disconnection. .

  Further, the invention of this application is such that even when the cross-sectional area in the pipe line is halved by arranging an electric brush having a sharp tip at the front end of the parachute, The pipe can be excavated and propelled while tapping it back and forth.

  Furthermore, the invention of this application enables the most efficient blowing by sending the compressed air at an angle of 23 to 25 degrees from the rear of the spiral generator, enabling the blowing to strongly back up the spiral flow, and the front of the parachute Even if there is a case where the parachute bulges or free movements are obstructed as the weight of the parachute increases by attaching a camera or an electric brush to the part, this can be dealt with.

  In the invention of this application, in order to make the most of the effect of constantly maintaining the parachute body in a swollen state, which is a feature of the spiral flow, to stabilize the camera and obtain an accurate image, Since it is necessary for the camera itself to be stable even if the speed changes, as a result of various studies, it has been found that the arrangement of the camera that satisfies this condition is to be attached to the front part of the parachute. This attachment method not only prevents the camera body from hitting the bottom surface of the tube, but also helps to maintain the camera itself. In addition, an excessive tension is not applied to the wire connected to the camera, and the risk of disconnection can be prevented.

  Many existing pipelines are used for a long period of time, causing dirt and rust, and there are cases where the cross-sectional area in the pipeline is halved. There are cases where it cannot pass.

  Under these circumstances, it has been found that the invention of this application can be further promoted by excavating the inside of the pipe line while hitting the tip with a brush-like sharp object. From this, the invention of this application is also a new proposal to arrange an electric brush on the front surface of the parachute.

  However, by attaching a camera or electric brush to the front part of the parachute, the parachute's own weight is increased, so there are cases where the parachute bulges and the free movement is blocked, so it is necessary to strongly back up the spiral flow, As a result of repeating the experiment of sending compressed air before and after the spiral generator, it turned out that sending compressed air at an angle of 23 to 25 degrees from the back is the most efficient method. We propose a device.

Example 1
In order to compare the case where the camera 4 of the invention of this application is arranged on the front surface portion 2F of the parachute with the case where the camera of the prior art is arranged, a comparative experiment was performed from the following viewpoint.

(1) Change of field of view in curved pipe and slack pipe (2) Parachute speed and movement of CCD camera (3) Impact on camera In a comparative experiment on the change of field of view in a curved pipe or slack pipe, As shown in FIG. 1 (a), when the camera 4 of the invention of this application is arranged on the parachute front face 2F, the camera 4 of the prior art as shown in FIG. 6 (a) is arranged. With a wide field of view, it was possible to grasp the slackness of the tube.

  In the curved pipe, as shown in FIG. 1B, when the camera 4 of the invention of this application is arranged on the parachute front part 2F, the prior art camera 4 as shown in FIG. Compared to the case, the situation of the curved pipe part can be grasped well.

  In the straight pipe, as shown in FIG. 1C, when the camera 4 of the invention of this application is arranged on the parachute front part 2F, the prior art camera 4 as shown in FIG. 6C is arranged. If the parachute 2 swells, the camera 4 descends to the bottom if the parachute 2 swells, and the camera 4 moves up and down by the speed of the parachute 2, while the side surface of the parachute 2 Although the current situation is disturbed, when the parachute is disposed on the front surface portion 2F of the parachute, the camera 4 is maintained at the center position as long as the parachute 2 is inflated.

As an on-site experiment, we conducted an experiment with a water conduit for an agricultural dam, 150m in length and 500mm in diameter. As a result, when the camera 4 is arranged on the parachute front part 2F, it is possible to clearly grasp the connection state of the bent pipe part and the water pool in the slack part without disturbing the current situation. .

However, the weight of the camera wire at the time of the experiment was set to 0.5 kg for the camera 4 disposed on the front surface and 10.0 kg for the 150 m wire.
(Example 2)
As shown in FIG. 2A, the invention of this application in which the electric brush 5 driven by the motor 6 is arranged on the parachute front surface portion 2F is compared with the case where the removal brush of the prior art is attached to the invention. A comparative experiment was conducted.

  In the prior art removal brush 5 attached to the rear, when solid solid or rust (hereinafter represented by solid C) is formed on the inner surface of the tube, the solid solid C or the like formed on the inner surface of the tube is parachute. There were many cases that blocked the transmission of 2. Therefore, even if the removal brush 5 is attached to the parachute 2, the removal brush 5 of the prior art attached to the rear R has little effect of removing the attachment C such as dirt and rust. On the other hand, this removal device of the invention of this application has a structure as shown in FIG. 2 (a). First, the removal device using the electric brush 5 is attached to the front surface portion 2F of the parachute to pass the parachute 2. It is a method to let you operate. Specifically, the removing device is a device that rotates by attaching a wire brush or plastic brush to the tip of the small motor 6, and rotating the brush 5 back and forth while moving the parachute 2 back and forth. This is a method of removing the hard solid C formed on the inner surface of 1a.

  This is a method for removing the attachment C by attaching a rough or rough cloth to the surface of the parachute 2 and moving it back and forth.

  In order to improve the removal of dirt and deposits C, the following method can be employed.

  The parachute 2 has a narrow tip and can be advanced by the pressure of the spiral flow FS, but it has been found that the air pressure rebounds when the diameter decreases from a large diameter to a certain diameter. Therefore, in this case, the inside of the pipe line 1a is narrowed by the solid C or the like. If the cross section becomes narrow, in that case, it is necessary to enlarge the blocking portion.

  In the above, in order to verify the diameter of the parachute with a narrow tip that is allowed to advance by the pressure of the spiral flow, the diameter (cross-sectional area) that can be technically transmitted using an experimental apparatus as shown in FIG. ) Was conducted. In this case, the pipe inner diameter was set to the illustrated dimensional conditions, the flow inner diameter of 100 mmΦ of this application, with the branch flow inner diameters of 75 mmΦ, 50 mmΦ, and 25 mmΦ.

As a result of the above experiment, the pipe diameter of the next stage following the pipe of this application can be sent from 3/4 to 1/2 of the pipe diameter of this application, but when it becomes 1/4 or less. The transmission was practically impossible.
(Example 3)
Use a parachute 2 to smoothly flow down the inside of the pipe 1a when a large-diameter pipe is passed through the pipe maintenance system using the spiral flow FS or when the solid attachment C in the pipe is removed. Therefore, in order to study the method using the compressed air L flow in order to reinforce the propulsive force of the spiral flow FS, the propulsive force enhancer shown in Fig. 3 (a) is required. The following experiment was conducted using

  In FIG. 3 (a), the end of the flexible hose 71 extending from the spiral flow generator 7 is inserted into the pipe 1 through which the parachute 2 is passed, and the compressed air L is supplied to the hose fixing tube 72 and expanded. Fixed. A backup flow generator 8 is connected to the upstream side of the spiral flow generator 7. In the backup flow generator 8, the backup flow FB is illustrated with a flow angle of 23 degrees.

  In the propulsion device shown in FIG. 3 (a), it is important that the backup flow generator 8 is a system that supports the spiral flow FS from the back and that it does not hinder the insertion of the wire 3. It is connected behind the spiral flow generator 7.

  In this case, the backup flow FB needs to send the compressed air flow L to the pipe 1 at an oblique angle, and various investigations have been made because the influence on the applied pressure and the spiral flow FS differs depending on the angle. As a result, it was found that the most efficient angle was 25 to 23 °, so 23 ° was set as the compressed air flow injection angle.

  Here, the power-up method is as follows.

  In order to back up the traction force of the spiral flow FS, an experiment was conducted in which a compressed air stream L was added at the same time, and the possibility of traction up was attached with a projection inside a large diameter pipe (φ600 mm). When only spiral flow FS is used, the peak of traction force is limited to about 35 kg within φ600mm, and a compressed air flow (backup flow) is blown from the back for backup.

  Note that the effect of the spiral flow FS decreases when the generator 7 reaches its peak at a tube diameter of about 100mm to 120mm, so it has been proven that there is a limit to the traction force even if the compressor pressure is increased using this device. It is.

  The flow of the spiral flow FS and the compressed air flow L as the backup flow FB was considered from the experiment as follows.

  In order to verify the nature of the flow of both airflows, a plastic tape streamer 9 was inserted into the tube 1 and the flow of each was observed. As a result, when only the spiral flow FS was used, as shown in FIG. 3 (b), the blowing flow of the vinyl tape flowed in a ripple shape without being entangled.

  On the other hand, as shown in Fig. 7 (a), the backup flow using only the compressed air flow (backup flow BF) is a state where the wave is turbulent and the vinyl becomes entangled and sinks to the bottom of the tube 1 as the vinyl streamer 9 advances downstream. Turned out to be. Accordingly, it was found that the compressed airflow BF alone is a turbulent flow and does not concentrate at the center of the tube 1 and therefore does not accurately feed the parachute 2.

On the other hand, when the air was blown in combination with the spiral flow FS and the backup flow FB, the flow in the case of both flows was sent as shown in FIG. 4 from the back of the spiral flow FS. In some cases, the spiral flow FS was found to flow in a rippled manner with the vinyl tape being blown from the outer periphery without breaking the flow state. That is, all the compressed airflows as the backup flow BF are entrained in the spiral flow FS and pressurized.
The traction force by the combined use of the spiral flow FS and the backup flow FB was compared with the spiral flow alone using the pipe diameter and the parachute diameter as parameters, and the experimental values shown in Table 1 below were obtained.

  From the above experimental results, it was found that the compressed air (backup flow FB) was superposed on the spiral flow FS so that the air was greatly pressurized.

  It has been found that even if a parachute having a diameter of φ500, 450, 400, or 250 mm is inserted into a pipe of φ600 mm, a traction force can be obtained in comparison with the diameter cross-sectional area of the parachute.

  In order to observe the degree of rise in the water level in the pipe standing at the end when part of the pipe (within the 6m section) was filled with water and extruded with a parachute, an experiment was conducted to push up the water in the pipe using the apparatus shown in FIG.

  However, the wire rope was used without a camera.

  The results of the experiment are shown in Table 2.

  From Table 2 above, comparing the spiral flow FS and the backup flow FB, the spiral was 20% higher than the backup flow FB.

  In fact, it was found that the parachute 2 that is pumped into the pipe diameter of 200 mm has a large force that pushes up 60 kg with only the spiral flow FS and pushes up the backup flow FB to push up 132 kg.

FIG. 1 (a) shows a situation of a tilted tube, and FIG. 1 (b) shows a curved shape. FIG. 1C is a diagram showing the situation when the pipe portion is used, and FIG. It is a figure which shows the outline | summary of the invention of this application which has arrange | positioned the electric brush in the front part of a parachute, (a) is a schematic diagram for demonstrating the usage method in improving the removal method of filth and a deposit | attachment. FIG. 6B is a diagram for explaining an experiment for obtaining a technically transmittable diameter in that case. It is a figure for demonstrating the method to back up spiral flow, (a) is a schematic diagram of a backup flow generator, (b) is a figure which shows typically the state of a windsock at the time of applying only spiral flow (C) is a figure which shows the state of a parachute at the time of applying a spiral flow. It is a schematic diagram which shows typically the flow when combining a spiral flow and a backup flow. It is a schematic diagram of an experimental device for observing the rise of the water level in the pipe standing at the end when part of the pipe (within 6m section) is full and extruded with a parachute. In contrast to FIG. 1, a mode of a comparative experiment relating to a change in field of view in a slack tube when a conventional camera is arranged behind a parachute is shown. FIG. 6 (a) shows a situation when an inclined tube is used. ) Shows the situation when the curved pipe is used, and FIG. 6C shows the situation when the pipe is straight. It is a figure for explaining the case where only the backup flow is applied in comparison with the method of backing up the spiral flow, (a) is a diagram schematically showing the state of the windsock when only the backup flow is applied, (B) is a figure which shows the state of a parachute at the time of applying a backup flow.

Explanation of symbols

1 Pipe 1a Pipe line 2 Parachute
F Parachute front
R Parachute rear 3 Wire rope 4 CCD camera 5 Brush 6 Small motor 7 Spoutal flow generator 71 Free hose 72 Hose fixing tube 8 Backup flow generator +
9 Vinyl tape streamer 10 Water C Deposit FS Spiral flow FB Backup flow L Compressed air

Claims (7)

  The parachute body attached to the tip of the rope body is stably maintained in a state where it is always inflated by the spiral flow regardless of the progress and speed of the parachute. Pipe flow diagnosis, which includes a process that enables a CCD camera to be diagnosed at a stable position using a CCD camera attached to the front of the parachute attached to the tip of the rope body as the observation part by spiral flow. Conservation method.   3. The CCD mounted on the front surface of the parachute according to claim 1, wherein a compressed air blower is disposed behind the spiral flow generator to enhance the feeding and pulling force of the parachute body in the pipe line and strongly back up the spiral flow. A pipeline diagnostic maintenance method characterized in that a camera can be stably operated. 3. The pipeline diagnostic maintenance method according to claim 2, wherein the feeding and pulling force of the parachute body is enhanced by sending compressed air at an angle of 23 to 25 degrees from the rear of the spiral flow generator.   The parachute attached to the tip of the rope body is stably maintained in a state where it is always swollen by the spiral flow regardless of the progress and speed of the parachute. Using an electric brush attached to the center of the front part of the parachute body attached to the tip of the rope body, the blocked part in the pipeline due to sludge solids, rust, etc. is excavated using the spiral flow while moving the parachute body back and forth in small increments. A method for maintaining a pipeline, comprising a step.   5. The electric motor mounted on the front surface of the parachute according to claim 4, wherein a compressed air blower is disposed behind the spiral flow generator to enhance the feeding and pulling force of the parachute body in the pipe line, and the spiral flow is strongly backed up. A method for maintaining a pipeline, characterized in that the brush can be stably operated. 6. The pipe maintenance method according to claim 5, wherein the feeding and pulling force of the parachute body is enhanced by sending compressed air at an angle of 23 to 25 degrees from the rear of the spiral flow generator.   A compressed air blower is placed behind the spiral flow generator to strengthen the feeding force of the parachute body in the pipeline, and the spiral flow is strongly backed up so that the CCD camera and electric brush attached to the front of the parachute A pipeline diagnostic maintenance method comprising a process that enables stable operation.

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