Coating damage position detection device

Abstract

An object of the present disclosure is to provide a coating damaged position detection device that can be reduced in weight according to the situation at the site.SOLUTION: According to the present disclosure, there is provided a coating damage position detection device 1 including a carriage 10, a front wheel electrode 100 and a rear wheel electrode 200 provided side by side in a front-rear direction of the carriage 10, a storage case 20 provided on an upper surface of the carriage 10 and configured to store at least a signal processing device and a battery, and a cover 30 configured to cover the storage case 20, in which the storage case 20 and the cover 30 are detachable from the carriage 10.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a coating damage location device. [Background technology]

[0002] A technology has been disclosed relating to a coating damage position detection device (also referred to as a detection device) that detects from the ground the presence and location of damaged parts of the corrosion protection coating (hereinafter referred to as damaged parts) of underground buried objects that have corrosion protection coatings on their outer surfaces. For example, Patent Document 1 discloses a technique for detecting, from the ground surface, the location of damage to an anticorrosion coating applied to the outer surface of a metal pipe buried underground. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 7-52166 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while the invention of Patent Document 1 considers a detection device that is integrated with a lock-in amplifier and the like, such a detection device has the problem of being large and heavy. As a result, such a detection device has the problem of being difficult to move and transport. In particular, conventional inspection devices have the problem of being difficult to move in places with poor footing, such as mountainous regions, and are heavy and difficult to move.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a coating damage location detection device that can be made lighter depending on the situation at the site. [Means for solving the problem]

[0006] The coating damage location detection device according to the present disclosure comprises: A trolley and front wheel electrodes and rear wheel electrodes arranged side by side in the front-rear direction of the bogie; a storage case provided on an upper surface of the carriage and configured to store at least a signal processing device and a battery; a cover for covering the storage case; Equipped with The storage case and the cover are detachable from the cart. It is characterized by: [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a coating damage location detection device that can be made lighter depending on the situation at the site. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view illustrating a coating damage location detection device according to an embodiment of the present disclosure, showing a state in which a cover is attached. [Figure 2] FIG. 1 is a perspective view illustrating a coating damage position detection device according to an embodiment of the present disclosure, showing a state in which a cover is removed from a carriage. [Figure 3] FIG. 2 is a perspective view of a cover according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a perspective view illustrating a coating damage position detection device according to an embodiment of the present disclosure, showing a state in which a storage case is removed from a carriage. [Figure 5] FIG. 1 is a diagram for explaining a coating damage position detection device according to an embodiment of the present disclosure, and is a perspective view of the coating damage position detection device as seen from the bottom side. [Figure 6] FIG. 1 is a perspective view illustrating a coating damage position detection device according to an embodiment of the present disclosure, showing a state in which a handle is removed from a carriage. [Figure 7] FIG. 1 is a perspective view illustrating a coating damage location detection device according to an embodiment of the present disclosure, the view illustrating the coating damage location detection device including training wheels. [Figure 8]FIG. 2 is a diagram for explaining a coating damage position detection device according to an embodiment of the present disclosure, and is an enlarged view of the front of the bogie. [Figure 9] 1 is a diagram for explaining an overview of a coating damage location detection system using a coating damage location detection device according to the present disclosure. [Figure 10] 10 is a diagram for explaining an outline of another embodiment of a coating damage location detection system using a coating damage location detection device according to the present disclosure. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described using examples, but it is clear that the present disclosure is not limited to the examples described below. In the following description, specific numerical values ​​and materials may be used as examples, but other numerical values ​​and materials may be used as long as the effects of the invention according to the present disclosure are obtained. Furthermore, the components of the following embodiments can be combined with each other. In addition, in this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the lower and upper limits.

[0010] [First embodiment] Hereinafter, a coating damage location detection device according to an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a diagram for explaining the coating damage position detection device 1 according to this embodiment, and is a perspective view showing the coating damage position detection device 1 in a state where a cover 30 is attached. Fig. 2 is a diagram for explaining the coating damage position detection device 1 according to this embodiment, and is a perspective view showing the coating damage position detection device 1 in a state where the cover 30 is removed from the carriage 10.

[0011] The coating damage position detection device 1 according to this embodiment is a coating damage position detection device 1 that detects the position of a coating damage portion in an underground buried object that has an anticorrosion coating applied to its outer surface.

[0012] (cart) The coating damage position detection device 1 according to this embodiment includes a carriage 10. The carriage 10 has an elongated shape as a whole. The longitudinal direction of the carriage 10 is the front-rear direction of the carriage 10. The X coordinate axis in Fig. 1 etc. is parallel to the front-to-rear direction of the dolly 10, the Y coordinate axis is parallel to the left-to-right direction of the dolly 10, and the Z coordinate axis is parallel to the up-to-down direction of the dolly 10. The X coordinate axis, Y coordinate axis, and Z coordinate axis in Fig. 1 etc. are mutually orthogonal. That is, the front-to-rear direction, left-to-right direction, and up-to-down direction of the dolly 10 are also mutually orthogonal.

[0013] An attachment 11 and a clamp lever (fastener) 12 for attaching a cover 30 (described later) are provided in the center of the carriage 10 in the longitudinal direction.

[0014] (Wheel electrode) The coating damage position detection device 1 according to this embodiment includes a front wheel electrode 100 and a rear wheel electrode 200 arranged side by side in the front-rear direction of the bogie 10.

[0015] As shown in FIG. 1 etc., the front wheel electrode 100 is arranged on the front side in the fore-and-aft direction of the bogie 10. The front wheel electrode 100 is supported by a front wheel support part 110. The upper side of the front wheel support part 110 in the vertical direction is connected to the bogie 10. The lower side of the front wheel support part 110 in the vertical direction is provided with a hole part (not shown) through which an axle (not shown) of the front wheel electrode 100 is inserted. The front wheel electrode 100 is supported via this axle. The front wheel electrode 100 is supported by the axle relative to the front wheel support part 110 so as to be rotatable around the axle.

[0016] 1 and other figures, the rear wheel electrode 200 is arranged on the rear side in the fore-and-aft direction of the bogie 10. In other words, the rear wheel electrode 200 is arranged on the rear side of the front wheel electrode 100 in the fore-and-aft direction of the bogie 10. The positions of the front wheel electrode 100 and the rear wheel electrode 200 in the fore-and-aft direction are not particularly limited, and they may be arranged with a predetermined gap between them relative to the bogie 10 so that the bogie 10 can move stably.

[0017] The rear wheel electrode 200 is supported by a rear wheel support part 210. The upper side of the rear wheel support part 210 in the vertical direction is connected to the bogie 10. The lower side of the rear wheel support part 210 in the vertical direction is provided with a hole part (not shown) through which an axle (not shown) of the rear wheel electrode 200 is inserted. The rear wheel electrode 200 is supported via this axle. The rear wheel electrode 200 is supported by the axle relative to the rear wheel support part 210 so as to be rotatable around the axle.

[0018] The front wheel electrodes 100 and the rear wheel electrodes 200 may be configured, for example, by six wheels arranged side by side in the direction along the respective axles, with a space between them provided by spacers or the like. The front wheel electrode 100 and the rear wheel electrode 200 are preferably made of, for example, conductive sponge rubber wheels.

[0019] By providing the front wheel electrode 100 and the rear wheel electrode 200, it is possible to detect the potential difference between the potential detected by one wheel electrode and the potential detected by the other wheel electrode.

[0020] (storage case) 2, the coating damage position detection device 1 according to this embodiment is provided on the upper surface 10a of the bogie 10 and includes a storage case 20 that stores at least a signal processing device and a battery. As will be described later, the storage case 20 is detachable from the bogie 10. The storage case 20 can store at least a signal processing device (not shown), a battery (not shown), and other tools. The devices stored in the storage case 20 are electrically connected to the front wheel electrodes 100, the rear wheel electrodes 200, and a laptop computer by cables (not shown). The top surface 10a of the cart 10 is the surface of the cart 10 facing upward in the vertical direction.

[0021] (cover) The coating damage position detection device 1 according to this embodiment includes a cover 30 that covers the storage case 20. In the coating damage position detection device 1 according to this embodiment, the cover 30 is detachable from the carriage 10.

[0022] By removing the cover 30 from the bogie 10, the coating damage location detection device 1 itself becomes lighter, ensuring operability in terrain that requires mobility, such as mountainous areas. On the other hand, the cover 30 also has the advantage of allowing necessary drawings and tools to be placed on it, so the cover 30 can be left attached on flat ground.

[0023] 3, the cover 30 includes a cover body 31. A mounting bracket 32 ​​is provided on the underside of the cover body 31. An attachment 11 and a clamp lever 12 are provided on the carriage 10 side. The clamp lever 12 has a handle portion including a lever portion and a shaft portion. The shaft portion has a screw thread (male screw portion). The diameter of the shaft portion is smaller than the diameter of the handle portion. The attachment 11 also has a hole portion formed therein having a screw thread (female screw portion) that corresponds to the screw thread of the shaft portion of the clamp lever 12. A portion of the shaft portion of the clamp lever 12 is inserted into the hole portion of the attachment 11.

[0024] When the cover 30 is attached to the cart 10, the mounting bracket 32 ​​is fixed between the attachment 11 on the cart 10 and the clamp lever 12. Specifically, by inserting the shaft of the clamp lever 12 into the opening 32a of the mounting bracket 32 ​​and rotating the clamp lever 12 around the shaft in a predetermined direction, the distance between the attachment 11 and the clamp lever 12 becomes relatively short, and the mounting bracket 32 ​​is fastened between the handle of the clamp lever 12 and the attachment 11. This fixes the cover 30 to the cart 10.

[0025] The attachment 11, clamp lever 12, and mounting bracket 32 ​​are not limited to those exemplified in Fig. 1 etc. The shapes of the attachment 11, clamp lever 12, and mounting bracket 32 ​​are not limited, and a structure that allows the attachment 11 to be engaged with the mounting bracket 32 ​​and fixed to each other without using tools is preferable. The fastening structure of the cover 30 including the attachment 11, clamp lever 12, and mounting bracket 32 ​​may be provided in pairs in the front-to-rear direction of the cart 10.

[0026] The cover 30 may be provided with a door 33. The door 33 allows the interior of the coating damage position detection device 1 to be checked even when the cover 30 is attached to the carriage 10. The cover 30 may be provided with a small item tray 34. 1 and the like, the cover 30 is provided so as to cover the storage case 20 and a portion of the dolly 10. However, the cover 30 may be configured to cover the entire dolly 10.

[0027] Furthermore, in the coating damage position detecting device 1 according to this embodiment, the storage case 20 is detachable from the carriage.

[0028] The storage case 20 may be detachably attached to the cart 10 by, for example, an index plunger 13. The index plunger 13 may be provided on the cart 10. The index plunger 13 is an axial member as a whole, and has a knob portion located on one side in the axial direction and an engagement portion (not shown) located on the opposite side of the knob portion. A recess or hole portion (not shown) corresponding to the index plunger 13 is provided on the storage case 20 side. The engagement portion of the index plunger 13 is inserted into this recess or hole portion, thereby fixing the storage case 20 to the cart 10. When attaching or detaching the storage case 20 to or from the cart 10, the knob of the index plunger 13 is operated to remove the engagement portion of the index plunger 13 from the recess or hole to set it in a released state. In the released state, the storage case 20 is simply placed on the cart 10 without being fixed thereto, and therefore the storage case 20 can be attached or detached to or from the cart 10.

[0029] 5 shows a perspective view of the coating damage position detection device 1 as seen from the bottom side. The carriage 10 and the storage case 20 may be attached by a method other than the index plunger 13. A structure that allows the storage case 20 to be attached to the carriage 10 without using tools is preferable. A pair of index plungers 13 may be provided on each of the carriage 10 in the front-to-rear direction.

[0030] By removing the storage case 20 from the carriage 10, the center of gravity of the coating damage position detection device 1 is lowered, ensuring operability in terrain where mobility is required, such as mountainous areas. The storage case 20 removed from the dolly 10 may be carried by the operator or other person.

[0031] In the coating damage position detecting device 1 according to this embodiment, it is more preferable that a handle 40 is further provided on the front upper surface 10a of the carriage 10.

[0032] Even on a ground surface such as a gravel road that may make the coating damage position detection device 1 unstable, the handle 40 can be grasped to hold the coating damage position detection device 1 so that it does not lift off the ground. Furthermore, when going over uneven ground or a step, or when changing direction on the spot, the handle 40 can be used to lift the coating damage position detection device 1. Furthermore, by changing the direction of the coating damage position detection device 1 using the rear wheel electrode 200 as a fulcrum, the coating damage position detection device 1 can be easily turned and changed direction.

[0033] As shown in Fig. 6, it is more preferable that the handle 40 is detachable from the cart 10. The handle 40 is preferably attached to the upper surface 10a of the cart 10 by a connecting means such as a bolt. In other words, it is preferable that a connecting means that can be connected to the cart 10 is provided on the underside of the handle 40, which is located opposite the grip 41.

[0034] Making the handle 40 detachable allows the handle 40 to be replaced. This allows the height of the grip 41 of the handle 40 to be changed according to the height of the operator of the coating damage location detection device 1. Furthermore, on slopes with inclines, workability can be improved by appropriately selecting a handle 40 at a height that makes it easy to lift the cart 10.

[0035] It is also preferable that the grips 41 of the handle 40 are arranged parallel to the longitudinal direction of the cart 10. When there is a slope on the ground on either side of the traveling direction of the cart 10, the worker will need to stand on either side of the cart 10 to hold the handle 40, so such a parallel arrangement improves workability.

[0036] In the coating damage location detection device 1 according to this embodiment, it is more preferable that a safety belt attachment fitting 51 is provided in front of the bogie 10. Also, in the coating damage location detection device 1 according to this embodiment, it is more preferable that a safety belt attachment fitting 52 is provided in the rear of the bogie 10. In the example of FIG. 1 etc., a safety belt attachment fitting 51 is provided at the front end 10f of the dolly 10, and a safety belt attachment fitting 52 is provided at the rear end 10r.

[0037] A safety belt (lifeline) can be attached to the safety belt attachment fittings 51 and 52. For example, when the coating damage position detection device 1 is driven on a steep slope or mountain path, one side of the safety belt can be attached to the safety belt attachment fittings 51 and / or 52 of the coating damage position detection device 1, and the other side of the safety belt can be attached to the safety belt main net. The safety belt attachment fitting 51 and / or the safety belt attachment fitting 52 may be attached to the safety belt via a harness or the like.

[0038] This makes it possible to prevent accidents such as the coating damage position detection device 1 falling off or dropping.

[0039] An operating handle 50 is provided on the rear side of the carriage 10. By gripping and operating the operating handle 50, the operator of the coating damage location detection device 1 can move the coating damage location detection device 1 forward or backward in the forward or backward direction, or make it turn left or right.

[0040] The operating handle 50 may be detachable from the carriage 10. This allows the height of the operating handle 50 to be changed according to the height of the operator of the coating damage location detection device 1, improving the workability when operating the coating damage location detection device 1.

[0041] The dolly 10 is provided with a platform 60. On the platform 60, a laptop computer 61, a display, and other devices may be placed.

[0042] The mounting base 60 may be detachable from the carriage 10. By being able to detach the mounting base 60 from the carriage 10, it is possible to lower the vehicle height of the entire coating damage position detection device 1. This has the advantage of improving the ability to travel through narrow areas where the height is limited by bushes, tree branches, etc.

[0043] The coating damage position detection device 1 according to this embodiment preferably further includes a pair of auxiliary wheels 310 at the front of the carriage 10. Furthermore, the coating damage position detection device 1 according to this embodiment preferably further includes a pair of auxiliary wheels 320 at the rear of the carriage 10.

[0044] 7 shows a coating damage position detecting device 1 provided with auxiliary wheels 310 and 320. Also, FIG. 8 shows an enlarged view of the front and vicinity of the carriage 10. The training wheels 310 and 320 are connected to the cart 10 via the training wheel support parts 311 and 321, respectively. A hole (not shown) through which the axle (not shown) of the training wheel 310 or the training wheel 320 is inserted is provided on the lower side of each of the training wheel support parts 311 and 321 in the vertical direction, and the training wheels 310 and 320 are supported via this axle. The training wheels 310 and 320 are supported by the axle relative to the training wheel support parts 311 and 321, respectively, so as to be rotatable around the axle.

[0045] The auxiliary wheel support parts 311 and 321 may be provided with springs 312 and 322. The action of the springs allows stable movement even when the ground is uneven.

[0046] 7 or 8, the auxiliary wheels 310 and 320 may be arranged so as to overlap the front wheel electrodes 100 and the rear wheel electrodes 200, respectively, in the front-to-rear direction of the bogie 10. With this configuration, stability during running can be ensured.

[0047] It is more preferable that the pair of training wheels 310 and 320 are detachable from the cart 10. By making the training wheels 310 and 320 detachable, it is possible to select whether or not to use the training wheels depending on the situation at the site. The auxiliary wheels 310 and 320 are preferably attached to the side of the cart 10 by a clamper or the like. In other words, it is preferable that means for attaching and detaching the auxiliary wheels 310 and 320 to the cart 10 without using tools is provided on the upper side of the auxiliary wheels 310 and 320.

[0048] (Coating damage location detection system) The coating damage position detection device 1 according to the above-described embodiment can detect the position of a damaged portion of an underground object having an anticorrosion coating on its outer surface. The underground object is, for example, a buried pipe. The underground object may also be, for example, a metal pipe such as a steel pipe.

[0049] The coating damage location detection device 1 may be used as part of a coating damage location detection system. As shown in FIG. 9, for example, a coating damage position detection system 1000 includes a coating damage position detection device 1 and a measurement signal generator 2.

[0050] In the coating damage location detection system 1000, an AC voltage is applied between the underground buried object b and a counter electrode 22 placed underground (inside the soil) using a measurement signal transmitter 2, and an AC current is passed through. The potential difference on the ground surface between the two points generated by the measurement signal transmitter 2 is detected by the front wheel electrode 100 and rear wheel electrode 200 of the coating damage location detection device 1, which moves along the underground buried object b on the ground directly above the underground buried object b.

[0051] For example, if there is a damaged area bs in an underground buried object b, a current I flows into the underground buried object b through the damaged area bs. This causes a potential difference around the damaged area bs. The potential difference on the ground surface thus generated is detected by the coating damage location detection device 1.

[0052] As explained in the above embodiment, the coating damage position detection device 1 detects the potential difference on the ground surface by the front wheel electrode 100 and the rear wheel electrode 200. The coating damage location detection device 1 continuously detects the potential difference on the ground surface while moving along the underground buried object b on the ground directly above the underground buried object b via the front wheel electrodes 100 and the rear wheel electrodes 200. In detail, the operator moves the coating damage location detection device 1 along the underground buried object b on the ground above the underground buried object b, and the front wheel electrodes 100 and the rear wheel electrodes 200 of the coating damage location detection device 1 detect the potential difference between two points on the ground surface as a detection signal.

[0053] The detected potential difference is input as a signal to a signal processing device mounted on the main body, processed by the signal processing device, and then output as information such as a waveform to a display device.

[0054] Furthermore, the coating damage location detection device 1 according to the above embodiment may be used, for example, as a part of the following coating damage location detection system 2000. The basic configuration of the coating damage location detection system 2000 is similar to that of the above coating damage location detection system 1000. In the coating damage location detection system 2000, a reference signal is generated from a reference signal output by a GPS receiver connected to the coating damage location detection device 1 and the measurement signal transmitter 2, and the coating damage location detection device 1 and the measurement signal transmitter 2 are synchronized based on this reference signal.

[0055] 10, a signal processing device 80 provided in the coating damage location detection device 1 receives as input the potential difference (hereinafter referred to as the detection signal) detected by the front wheel electrode 100 and the rear wheel electrode 200, as well as a reference signal from a reference signal generator 82. The reference signal is a frequency signal output from the reference signal generator 82. The reference signal is generated based on a reference signal output by a GPS receiver 84 provided in the coating damage location detection device 1. The signal processing device 80 compares the reference signal with the detection signal, and any signal in the detection signal that is not synchronized with the frequency of the reference signal is removed as a noise signal. Only the detection signal synchronized with the reference signal is displayed (=output) on the display device 86.

[0056] The operation of the measurement signal transmitter 2 is similar to that of the above-described coating damage location detection system 1000, but a reference signal is generated from the reference signal transmitter 26 based on the reference signal output by the GPS receiver 24, and an AC voltage generated based on this reference signal is applied between the underground buried object b and the counter electrode 22 placed underground (inside the soil), thereby passing an AC current.

[0057] The reference signal may be generated based on 1 PPS (1 Pulse Per Sec) synchronized with GPS UTC (Universal Time Coordinated). The advantage of using a GPS reference signal is that it can output a highly accurate and stable frequency signal without being affected by individual differences or ambient temperature changes, as is the case with crystal oscillators. This reduces the phase difference between the reference signals on the coating damage location detection device 1 side and the measurement signal transmitter 2 side, making it easier to distinguish between the detection signals. Instead of the GPS receiver, the reference signal generator may include a crystal oscillator, and the frequency signal may be output using the signal output from this crystal oscillator.

[0058] In the coating damage location detection device 1, the signal processing device 80, the GPS receiver 84, and the reference signal generator 82 may be stored in the storage case 20. In addition, the GPS antenna used to receive GPS signals may be attached to the cover 30 or the main body frame 10. When the cover 30 is removed or when the storage case 20 is used separated from the main body frame 10, the GPS antenna can also be attached to the storage case 20.

[0059] It should be noted that the technical scope of the present disclosure is not limited to the above-described embodiments, and it is obvious that various modifications can be made without departing from the spirit of the present disclosure. Within the scope of the present disclosure, the components in the above embodiments may be replaced with well-known components as appropriate, and the above modifications may be combined with the above embodiments as appropriate.

[0060] (Addendum) The coating damage position detection device according to the above embodiment can be understood, for example, as follows. (1) A coating damage location detection device according to one aspect of the present disclosure includes: A trolley and front wheel electrodes and rear wheel electrodes arranged side by side in the front-rear direction of the bogie; a storage case provided on an upper surface of the carriage and configured to store at least a signal processing device and a battery; a cover for covering the storage case; Equipped with The storage case and the cover are detachable from the cart. It is characterized by: The coating damage position detection device having the above configuration can be made lighter depending on the situation at the site.

[0061] (2) In the coating damage location detection device described in (1) above, The dolly further includes a handle on a front upper surface thereof; The handle may be detachable from the carriage.

[0062] (3) In the coating damage location detection device described in (1) or (2) above, A safety belt attachment may be provided at the front and / or rear of the trolley.

[0063] (4) In the coating damage location detection device according to any one of (1) to (3), A pair of auxiliary wheels is further provided at the front and / or rear of the dolly, The pair of training wheels may be detachable from the carriage.

[0064] (5) In the coating damage location detection device according to any one of (1) to (4), The front wheel electrode and the rear wheel electrode may detect a potential difference on the ground surface by moving along the underground buried object on the ground surface directly above the underground buried object. [Industrial Applicability]

[0065] The coating damage location detection device according to the present disclosure can be made lighter depending on the situation at the site, making the invention according to the present disclosure extremely useful in industry. [Explanation of symbols]

[0066] 1. Coating damage location detection device 10 carts 20 Storage Case 30 Cover 100 front wheel electrode 200 Rear wheel electrode 310, 320 training wheels

Claims

1. A trolley and front wheel electrodes and rear wheel electrodes arranged side by side in the front-rear direction of the bogie; a storage case provided on an upper surface of the carriage and configured to store at least a signal processing device and a battery; a cover for covering the storage case; Equipped with The storage case and the cover are detachable from the cart. A coating damage location detection device characterized by:

2. The dolly further includes a handle on a front upper surface thereof; The handle is detachable from the dolly.

2. The coating damage location detection device according to claim 1.

3. A safety belt attachment bracket is provided at the front and / or rear of the cart.

3. The coating damage location detection device according to claim 1 or 2.

4. A pair of auxiliary wheels is further provided at the front and / or rear of the carriage, The pair of training wheels are detachable from the carriage.

3. The coating damage location detection device according to claim 1 or 2.

5. the front wheel electrodes and the rear wheel electrodes move along the underground buried object on the ground surface directly above the underground buried object to detect a potential difference on the ground surface.

3. The coating damage location detection device according to claim 1 or 2.

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