JP2023000264A - Sewerage conduit inspection method and inspection system - Google Patents

Abstract

To obtain accurate information on the location of a degradation or the degree of the degradation.SOLUTION: A sewage conduit inspection method of the present invention is a method for inspecting a sewage conduit. In the sewage conduit inspection method, a float arranging step or a float moving step, and a deterioration determination step are executed. In the float arrangement step, a float with a string attached is flowed from a manhole on the upstream side of the sewage conduit while continuously acquiring images inside the sewage conduit, and the float is stopped when it reaches the position where it is to be arranged. In the float moving step, the string-attached float is flowed from the manhole on the upstream side of the sewage conduit while continuously acquiring images inside the sewage conduit. In the deterioration determination step, a deterioration is determined on the basis of the images of the sewage conduit, and the position of the deterioration is determined on the basis of the length of the string attached to the float.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sewer pipe inspection method and a sewer pipe inspection system for inspecting sewer pipes.

Patent Documents 1 to 4, Non-Patent Documents 1 and 2, etc. are known as conventional techniques for inspecting underground pipes such as sewage pipes. In the techniques disclosed in Patent Documents 1 to 4, the inside of a pipe is inspected and repaired by using a device with a complicated structure such as a self-propelled device that penetrates into the pipe. On the other hand, in the techniques disclosed in Non-Patent Documents 1 and 2, the condition inside the pipe is inspected based on the image taken from inside the manhole.

JP-A-8-220002 Japanese Patent Application Laid-Open No. 2003-302219 Japanese Patent Application Laid-Open No. 2007-113240 Japanese translation of PCT publication No. 2015-519570

Water and Sewerage Department, Fuji City, Shizuoka Prefecture, “Efforts to introduce stock management through public-private partnership”, June 2017, [searched on April 2, 2021], Internet <https://www.mlit.go. jp/common/001194078.pdf>. Akihiko Yamanaka, "Maintenance and Management of Sewer Pipes by Comprehensive Private Outsourcing", Construction Machinery Construction Vol.73, No.3, March 2021.

However, the conventional techniques disclosed in Patent Documents 1 to 4 tend to be costly, and it is difficult to inspect pipes and culverts located under alleys where vehicles cannot enter. Therefore, it is difficult to apply it to inspection of a huge amount of equipment. On the other hand, the techniques disclosed in Non-Patent Documents 1 and 2 can be easily applied to the inspection of a huge amount of equipment because they can be carried out using only simple equipment without entering the inspection manhole on the ground. However, it is difficult to accurately measure the position of deterioration or the degree of deterioration without entering the inspection manhole. An object of the present invention is to obtain accurate information on the position of deterioration or the degree of deterioration based on the techniques disclosed in Non-Patent Documents 1 and 2.

The sewer pipe inspection method of the present invention is a method for inspecting a sewer pipe without entering an inspection manhole. The sewer pipe inspection method executes a floating arrangement step or a floating movement step and a deterioration determination step. In the float arrangement step, the float attached with the thread is made to flow from the manhole on the upstream side of the sewer culvert while continuously acquiring images inside the sewer culvert, and the float is stopped when the position to be arranged is reached. In the float movement step, a float attached with a thread is caused to flow from a manhole on the upstream side of the sewer culvert while continuously acquiring images inside the sewer culvert. The deterioration determination step determines deterioration based on the image of the sewer pipe in the image, and determines the position of deterioration based on the length of the thread attached to the float.

The sewer pipe inspection system of the present invention includes a float, a thread, a thread winding device, and a recording device. The float has a light-emitting section and an image acquisition section that continuously acquires images. The thread is attached at one end to the float. The thread winding device has a function of measuring the length of the thread that has been wound on the other end side of the thread and sent out. The recording device records the image in association with the length of the thread that was sent out when the image was acquired.

According to the sewer pipe inspection method of the present invention, the position of deterioration can be determined based on the length of the thread when the position of the float is at the deteriorated position. Only a simple device can accurately measure the position of deterioration. According to the sewer pipe inspection system of the present invention, when judging the deterioration based on the image of the sewer pipe in the image, the position of the deterioration can be found based on the length of the thread attached to the float.

The figure which shows the 1st processing flow of the sewer culvert inspection method. The figure which shows the 2nd processing flow of the sewer culvert inspection method. FIG. 4 is a vertical cross-sectional view when acquiring an image inside a sewage pipe from a pipe mouth camera. FIG. 11 is a vertical cross-sectional view of the float attached with the thread when it is placed in the sewage pipe or when it is flowing. Fig. 3 shows the configuration of the float attached to the thread; FIG. 4 is a diagram showing the configuration of a floating portion having a light emitting portion; FIG. 4 is a diagram showing a configuration of a floating section including a light emitting section and an image acquisition section; FIG. 4 is a plan view showing an example of a floating portion having a light emitting portion; FIG. 10 is a side view showing an example of a floating portion provided with a light emitting portion; The figure which shows the example of the image|video in a sewer pipe when a float is arrange|positioned in the position of 40m from a pipe mouth. The figure which shows the functional structural example of a sewer pipe inspection system.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail. Components having the same function are given the same number, and redundant description is omitted.

FIG. 1 shows a first processing flow of the sewer pipe inspection method, and FIG. 2 shows a second processing flow of the sewer pipe inspection method. Fig. 3 is a vertical cross-sectional view of when the image inside the sewer pipe is acquired from the pipe mouth camera, and Fig. 4 is a vertical cross-sectional view of when the float with the thread attached is placed inside the sewer pipe or when it is flowing. show. Figure 5 shows the configuration of the float attached to the thread. FIG. 6 shows the configuration of the floating portion provided with the light emitting portion. FIG. 7 shows the structure of the floating part provided with the light emitting part and the image acquisition part. 8 is a plan view showing an example of a floating portion provided with a light emitting portion, and FIG. 9 is a side view showing an example of a floating portion provided with a light emitting portion. FIG. 10 is a diagram showing an example of an image inside a sewer pipe when a float is placed at a position 40 m from the pipe mouth. (A) is an image acquired from the vicinity of the tube mouth. (B) is an image obtained by slightly enlarging the image of (A), and (C) is an image obtained by further enlarging the image of (B).

The sewer pipe inspection method is a method for inspecting the sewer pipe 930 without entering the manhole for inspection. The first processing flow of the sewer pipe inspection method executes an image acquisition step (S200), a floating placement step (S100), and a deterioration determination step (S300). The second processing flow of the sewer pipe inspection method executes an image acquisition step (S200), a floating movement step (S110), and a deterioration determination step (S300).

In the image acquisition step ( S<b>200 ), an image of sewer culvert 930 is acquired from inside manhole 910 of sewer culvert 930 . FIG. 3 shows how an image inside the sewer culvert 930 is acquired from the mouth camera 200 . An operator inserts the pipe mouth camera 200 into the manhole 910 from the ground and acquires an image. As the tube mouth camera 200, a simple tube mouth camera or a tube mouth TV camera disclosed in Non-Patent Document 1 may be used. Also, the obtained video may be stored in a tablet terminal or the like disclosed in Non-Patent Document 1. If it can be determined from the acquired image that there is no deterioration inside the sewer pipe 930, the inspection work may be terminated at the image acquisition step (S200).

If deterioration is confirmed in the image acquisition step (S200), and if the image acquired in the image acquisition step (S200) cannot determine the state of the inner part of the sewer culvert 930, there is no deterioration in the image acquisition step (S200). If it cannot be determined, the process proceeds to the floating arrangement step (S100) or the floating movement step (S110). In the float placement step (S100), the float 110 attached with the string 100 is allowed to flow from the manhole 910 on the upstream side of the sewer culvert 930 while continuously acquiring images of the interior of the sewer culvert 930, and the float 110 reaches the desired placement position. Sometimes the float 110 is stopped. The float movement step (S110) causes the float 110 attached with the thread 100 to flow from the manhole 910 on the upstream side of the sewer culvert 930 while continuously acquiring images inside the sewer culvert 930. FIG. "Continuous acquisition of images" includes not only acquisition of dozens of images per second like a moving image, but also acquisition of still images once per second. . The interval at which images are acquired may be determined in consideration of the speed of the float 110 . The image may be acquired by the mouth camera 200, but when the sewer culvert 930 is long, the image may be acquired by the image acquisition unit 116 provided in the float 110, which will be described later. The float 110 has a structure that floats on the inner water surface 950 of the culvert and flows on the inner water surface 950 of the culvert. The speed at which the float 110 flows cannot be made faster than the water flow, but it is possible to make it flow slowly by controlling the speed at which the thread 100 is let out.

The difference between the float arrangement step (S100) and the float movement step (S110) is whether or not the float 110 is stopped. By stopping the float 110, time for measuring the length of the thread 100 can be secured. If the speed at which the float 110 is allowed to flow is slow, there is no need to stop it. Further, when the length of the thread 100 can be measured instantaneously, such as when the thread 100 is wound on the thread winding device 210 having the function of measuring the length of the thread 100 sent out, there is no need to stop the thread. A reel for fishing may be used as the line winding device 210, or a tape measure capable of measuring several tens of meters may be used. For example, if the thread winding device 210 has a function of maintaining the display of the measured length when the button is pressed once, and displaying the length being measured in real time when the button is pressed again, the length of the thread can be measured. There is no need to stop the float 110 at this point. Whether the float arrangement step (S100) or the float movement step (S110) is selected depends on the speed of the float 110 flowing, the time required to measure the length of the thread 100, the accuracy required for distance measurement, and the like. It should be decided after careful consideration. In order to know the distance from the pipe mouth 920 to the float 110, the length of the thread 100 when the float 110 exists at the pipe mouth 920 may be recorded as an initial value. Note that the thread 100 may be marked with a mark (such as a marker) for recognizing the length of the thread that has been sent out, or may be devised to make it easier for the operator to understand the distance, such as changing the color for each fixed distance. may

The float 110 may be composed of a float portion 111, a fixed portion 112, and a connection portion 113 (see FIG. 5). The fixing portion 112 and the connecting portion 113 may have the same shape as a fishing float. The float 110 is fixed to the line 100, but may be repositioned manually similar to fishing floats. However, since the location of the float 110 on the thread 100 affects the measurement of the distance from the pipe mouth 920 to the float 110, it is desirable to attach the float 110 to a predetermined location.

Also, the light-emitting portion 114 and the battery 115 may be provided in the floating portion 111 (see FIG. 6). In the case of FIG. 6, the floating portion 111 is translucent, and a material that diffuses the light from the light emitting portion 114 may be used. For example, a translucent milky white material may be used. An LED (light emitting diode) or the like may be used for the light emitting unit 114 . Also, by arranging the light emitting unit 114 on the opposite side of a heavy object such as the battery 115, the light emitting unit 114 may be placed upward. If the floating part 111 is provided with the light emitting part 114, the inside of the sewer culvert 930 can be brightened, so that it becomes easier to obtain an image, and it becomes easier to judge deterioration in the later-described deterioration judgment step (S300).

Further, an image acquisition section 116 may be provided inside the floating section 111 (see FIG. 7). In the case of the floating portion 111 in FIG. 7, at least the portion where the image acquisition portion 116 is arranged is colorless and transparent. Other parts may be made of a material that scatters light such as milky white. A small CCD camera or the like may be used as the image acquisition unit 116 . Further, control of the image acquisition unit 116 and transmission/reception of the acquired image may be performed wirelessly, or a core wire for communication may be attached to the thread 100 . It should be noted that when the image acquisition unit 116 acquires the image, the tube mouth camera 200 may also acquire the image.

FIGS. 8 and 9 are specific examples in which a light-emitting portion 114 is provided inside the floating portion 111 shown in FIG. A fixed portion 117 is arranged in the center of the floating portion 111 , and the light emitting portion 114 is attached to the fixed portion 117 . The surface of the fixed portion 117 may be mirror-finished. A luminance adjustment unit 118 for adjusting luminance may also be provided.

In the deterioration determination step (S300), deterioration is determined based on the image of the sewer culvert 930 in the image, and the position of deterioration is determined based on the length of the thread 100 attached to the float 110. FIG. Deterioration based on the image of the sewer culvert 930 (for example, “intrusion water”, “joint displacement”, “corrosion”, etc. described in Non-Patent Document 1) may be judged by human eyes. At that time, a person can judge the position based on the length of the thread 100 . As shown in FIG. 4, the distance between the float 110 and the tube mouth 920 can be determined based on the length of the thread 100 . The result of the deterioration determination may be used for total processing as shown in Non-Patent Document 1.

According to the sewer pipe inspection method described above, the position of deterioration can be determined based on the length of the thread when the position of the float is at the deteriorated position. The position of deterioration can be accurately measured only with the device. When the length of the sewer culvert 930 is short, the float 110 does not need the light emitting unit 114 and the image acquiring unit 116, and it is sufficient to continuously acquire images with the mouth camera 200. FIG. As the length of the sewer culvert 930 becomes longer, it becomes darker and thus the light emitting section 114 is required. FIG. 10 is a diagram showing an example of an image inside a sewer pipe when a float is placed at a position 40 m from the pipe mouth. (A) is an image acquired from the vicinity of the tube mouth. Float cannot be recognized in (A). (B) is an image obtained by slightly enlarging the image of (A). A white dot near the center is floating 110, but it is difficult to recognize. (C) is an enlarged image of the image of (B). Although the float 110 can be recognized, it becomes difficult to recognize deterioration with the mouth camera 200 . In such a case, the float 110 needs to be provided with the light emitting section 114 and the image acquisition section 116 .

FIG. 11 shows a configuration example of the sewer pipe inspection system of the present invention. The sewer pipe inspection system 10 includes a float 110 , a thread 100 , a thread winding device 210 , a recording device 300 and a pipe mouth camera 200 . The float 110 has a light emitting unit 114 and an image acquisition unit 116 that continuously acquires images. Thread 100 has one end attached to float 110 . The thread winding device 210 has a function of measuring the length of the thread 100 wound on the other end of the thread 100 and sent out. The recording device 300 records the image in association with the length of the thread that was sent out when the image was acquired. The image acquisition unit 116 and the recording device 300, and the thread winding device 210 and the recording device 300 are connected by a communication line so that the image acquisition timing and the thread length can be recorded in association with each other. Also, the tube mouth camera 200 and the recording device 300 may be connected by a communication line, and images may be recorded in the recording device 300 . For the recording device 300, for example, a tablet terminal disclosed in Non-Patent Document 1 may be used. According to the sewer culvert inspection system 10, when judging deterioration based on the image of the sewer culvert 930 in the image, the position of deterioration can be found based on the length of the thread 100 attached to the float 110. That is, according to the sewer pipe inspection system 10, the sewer pipe inspection method described above can be easily executed. Also, if the sewer pipe inspection system 10 is used, the second processing flow of the sewer pipe inspection method shown in FIG. 2 may be used.

100 Thread 110 Float 111 Floating Part 112 Fixing Part 113 Connecting Part 114 Light Emitting Part 115 Battery 116 Image Acquisition Part 117 Fixing Part 118 Luminance Control Part 200 Pipe Orifice Camera 210 Thread Winding Device 300 Recording Device 910 Manhole 920 Pipe Orifice 930 Sewer Pipe 950 Pipe water surface in the ditch

Claims (8)

A sewer pipe inspection method for inspecting a sewer pipe, comprising:
A float arrangement step in which a float attached with a thread is caused to flow from a manhole on the upstream side of the sewer culvert while continuously acquiring images inside the sewer culvert, and the float is stopped when it reaches a position to be arranged;
a degradation determination step of determining deterioration based on the image of the sewer pipe in the image, and determining the position of the deterioration based on the length of the thread attached to the float;
A sewer pipe inspection method to implement. A sewer pipe inspection method for inspecting a sewer pipe, comprising:
a floating moving step of flowing a float attached with a thread from a manhole on the upstream side of the sewer culvert while continuously acquiring images inside the sewer culvert;
a degradation determination step of determining deterioration based on the image of the sewer pipe in the image, and determining the position of the deterioration based on the length of the thread attached to the float;
A sewer pipe inspection method to implement. The sewer pipe inspection method according to claim 1 or 2,
The sewer pipe inspection method, wherein the float includes a light emitting part. The sewer pipe inspection method according to any one of claims 1 to 3,
A sewer pipe inspection method, wherein the thread is wound on a thread winding device having a function of measuring the length of the sent thread. The sewer pipe inspection method according to any one of claims 1 to 3,
A method for inspecting a sewer pipe, wherein the thread is provided with a mark for recognizing the length of the thread sent out for each predetermined length. The sewer pipe inspection method according to any one of claims 1 to 5,
A method of inspecting a sewage pipe, wherein the continuously acquired images are images acquired at a manhole on the upstream side through which a float flows. The sewer pipe inspection method according to any one of claims 3 to 5,
The float also includes an image acquisition unit,
The sewer pipe inspection method, wherein the continuously acquired images are images acquired by the image acquiring unit. A sewer pipe inspection system for inspecting a sewer pipe, comprising:
a float having a light emitting unit and an image acquiring unit for continuously acquiring images;
a thread having one end attached to the float;
a thread winding device having a function of measuring the length of the thread that is wound on the other end side of the thread and sent out;
A sewer pipe inspection system, comprising: a recording device that records the image in association with the length of the thread sent out when the image is acquired.

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