JP7441048B2 - Buried piping inspection device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for inspecting the internal health of piping for inspecting cracks, pitting corrosion, and corrosion locations in an old buried tank.

Today, various types of tanks are used, such as buried tanks, above-ground tanks, and vertical tanks, and these tanks are connected to fuel inlets or outlets through piping. Particularly when the tank is buried underground, if defects such as cracks, pitting, and corrosion occur in the tank, oil will leak from the tank, causing problems. For example, a fuel pipe is used to fill an underground tank used at a gas station with gasoline, and a fuel pipe is used to fill an underground tank with gasoline above ground (a car).

In this case, as the buried tank ages, cracks and the like occur, causing oil leakage. For example, Patent Document 1 has been proposed as a method for solving such problems. This invention is an ultrasonic inspection method that detects discontinuous parts of the inspected object by irradiating the object with ultrasonic waves, sets a defect inspection range of the inspected object, and performs defect inspection at a constant pitch. It is an invention that is carried out.

Japanese Patent Application Publication No. 10-115605

However, in the conventional method described above, it is difficult to inspect the piping of a tank buried underground. On the other hand, various examinations and treatments using fiberscopes are widely performed.

Therefore, the present invention provides a piping internal health investigation device that enables inspection of tanks buried underground, prevents oil leakage that causes soil contamination, and inspects for cracks, pitting, and corrosion in buried tanks. In particular, the present invention provides an apparatus for investigating the internal health of piping, which magnifies and records captured images of objects to be inspected, and furthermore enables inspection of piping defects from a distance by remote control.

According to the present invention, the above-mentioned problem can be solved by a videoscope, a processing means for processing a captured image captured by the videoscope, a monitor for displaying the captured image, and a monitor for recording the captured image and for measuring normal piping that has been measured in advance. a recording device for recording a standard sample image ; and a microphone input processing device for recording information corresponding to the captured image collected by a microphone in the recording device; A buried pipe inspection device that is inserted into a pipe and operates a controller based on a captured image displayed on the monitor to inspect cracks and corrosion defects in the buried pipe, further comprising: An arc welding section is installed, and when the defect in the buried pipe is detected, a ceramic metal wire is supplied to the arc welding section, and ceramic arc spraying is performed to coat the defect with a ceramic layer of a certain thickness. The inspection apparatus for underground piping is formed and repaired, and when a defect in the piping is repaired, the measurement image is compared with the standard sample image recorded in advance in the recording means, and the microphone input This can be achieved by providing a buried piping inspection apparatus that uses a processing means to perform repair with reference to information corresponding to the captured image at the inspection target position from the microphone recorded in the recording means.

According to the present invention, the captured image can be enlarged and displayed on the monitor, and the information of the captured image can be recorded in the storage means, so that cracks, pitting corrosion, corrosion, etc. that occur in the tank can be reliably detected. Defects can be detected.

FIG. 1 is an external view of the internal health inspection device of the present invention. FIG. 2 is a diagram illustrating a system configuration of an internal soundness investigation device. It is a figure which shows the movement of the tip part of a videoscope. It is a figure which shows the example of using an internal soundness investigation apparatus for piping inspection. FIG. 3 is a diagram illustrating how a videoscope is inserted into an oil supply pipe from an oil supply port. FIG. 2 is a diagram showing a state in which the internal health checking device of the present invention is connected to a network. It is a figure which shows an example of arc spraying to the inner peripheral surface of the oil supply pipe by an arc spraying machine.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an external view of an apparatus for investigating the internal health of piping according to the present invention. In the figure, the internal health investigation device 1 includes a videoscope 2 with a detachable optical adapter, a main body 3 that houses the videoscope 2, a controller 4 that controls the internal health investigation device 1, and various components. It is composed of a monitor 5 for displaying images and a power supply section 6.

FIG. 2 is a diagram illustrating the system configuration of the internal health investigation device 1. As shown in FIG. As shown in the figure, a control unit 7 is connected to the internal health investigation device 1. This control unit 7 is attached to the main body 3, for example, as shown in the figure.

Further, the videoscope 2 includes a light source device for obtaining illumination light necessary for photographing, and a bending device for electrically bending the videoscope 2 freely. Further, a captured image from an image sensor at the tip of the videoscope 2 is supplied to a control circuit within the main body 3.

The circuit configuration of the main body 3 includes a captured image processing section 8, a CPU 9, a ROM 10, a RAM 11, a LAN interface (hereinafter referred to as LAN I/F) 12, a USB interface (hereinafter referred to as USB I/F) 13, and an input interface ( (hereinafter referred to as input I/F) 14, a microphone input processing section 15, an arc welding control section 16, and an operation input section 17 (controller 4).

Further, the above-mentioned controller 4 is connected to the input I/F 14 via a control unit 7 and a bus. The controller 4 controls the drive of the videoscope 2.

Note that the USB I/F 13 is an interface when a USB memory is attached and data of captured images acquired by the internal health investigation device 1 is stored in the USB memory. Further, the LAN I/F 12 is an interface for connecting a personal computer (PC).

The captured image processing unit 8 processes the captured image supplied from the video scope 2, performs the processing necessary for displaying it on the monitor 5, and further performs the above-mentioned processing on the processed captured image via a signal line. Record to USB memory. Further, the microphone input processing section 15 is a processing section for recording information collected by the microphone on a USB memory, and is configured to record audio information on the USB memory in correspondence with a captured image. Incidentally, when detecting a defect in the piping, the arc welding control section 16 controls an arc welding machine, which will be described later, for repairing the defect.

Note that the CPU 9 performs processing according to the program stored in the ROM 10, and drives the internal health checking device 1 using the RAM 11 as a work area. The ROM 10 also stores image data of normal piping (standard sample) measured in advance, and as will be described later, the image data of the standard sample is used for comparison with measurement data. Alternatively, the image data of the standard sample may be stored in a USB memory or the like.

Further, FIG. 3 is a diagram showing the movement of the distal end portion 31 of the videoscope 2, which can be bent in four directions according to instructions from an operator using the controller 4. Note that the operation signal from the controller 4 is notified to the videoscope 2 via the operation input section 17, input I/F 14, and unit 7.

In the above configuration, an example in which defect inspection is performed using the internal soundness investigation device 1 of this example will be described below.
FIG. 4 shows an example in which the internal health investigation device 1 of this example is applied to piping when storing gasoline in an underground tank. In the same figure, an underground tank 21 includes a fuel pipe 22 for filling gasoline, a fuel pipe 23 for sucking gasoline from the underground tank 21, a ventilation pipe 24 for ventilating the underground tank 21, and a gasoline liquid stored in the underground tank 21. A liquid level gauge 25 is provided to measure the surface height. Further, the underground tank 21 is buried at a predetermined depth from the ground surface, and a concrete (not shown) is provided above the underground tank 21.

Further, the oil filling pipe 22 is provided with an oil filling port 26 on the ground surface, and gasoline is filled from the oil filling port 26. Further, equipment 27 such as a meter and a pump is provided on the surface of the fuel pipe 23 to suck gasoline from the underground tank 21 and measure the amount of gasoline to be sucked. Further, the oil supply pipe 22 is provided with a valve 28, and the oil supply pipe 23 is provided with a valve 29. When repairing/renovating the underground tank 21, the valves 28 and 29 are closed. Note that the vent pipe 24 is provided with a vent 30 to discharge gas generated within the underground tank 21.

FIG. 5 is an enlarged view of the oil supply pipe 22 described above. In this example, no manhole was formed as shown in FIG. 1, and in order to detect defects in the oil supply pipe (buried pipe) 22, it was necessary to break the concrete and dig a hole. However, in the case of this example, a defect in the oil supply pipe 22 is detected as follows.

First, before the investigation using the video scope 2, a pressure test of pressurization or depressurization is performed, and is used in combination to determine the state of health and identify abnormalities. Next, as shown in FIG. 5, the videoscope 2 is inserted into the oil supply pipe 22 through the oil supply port 26.

Thereafter, the operator inspects the interior of the oil supply pipe 22 for cracks, pitting, and corrosion while operating the controller 4 described above. In this case, a light emitting section 31a is provided at the tip of the videoscope 2 as shown in FIG. . Therefore, the operator operates the controller 4 while looking at the monitor 5 to check for cracks, pitting, and corrosion that have occurred in the oil supply pipe 22.

At this time, as shown in FIG. 3, the tip of the videoscope 2 can be bent in four directions, and the operator operates the controller 4 while watching the monitor 5, sequentially starting from the vicinity of the oil filler port 26 of the oil filler pipe 22. , check for cracks, etc. on the inner wall of the oil supply pipe 22. Note that although the oil supply pipe 22 has bent parts 32 and 33, the videoscope 2 is configured to be flexible and curves according to the shape of the oil supply pipe 22, and the position of the valve 28 provided at the end of the oil supply pipe 22 is adjusted. can be reliably inspected.

During this time, images captured by the videoscope 2 are sequentially displayed on the monitor 5 and are also recorded on the aforementioned USB memory. Therefore, after the inspection is completed, the captured image recorded on the USB memory can be examined to check even minute cracks.

Specifically, as mentioned above, a standard sample stored in advance in the ROM 10 or a USB memory is compared with, for example, a captured image recorded in a USB memory to identify cracks, pitting corrosion, and corrosion locations inside the buried pipe. . In addition, if cracks, pitting, or corrosion occur, specify the distance from the entrance of the buried pipe to the location where the occurrence occurs, and the size.
In addition, the identification of cracks, pitting, and corrosion is determined by taking into consideration the years of burial, the surrounding environment, changes over time, etc.

The control unit 3 also has a function to enlarge the captured image, allowing the operator to display an enlarged image of the inner wall of the oil supply pipe 22 on the monitor 5 and record it on a USB memory as necessary. , furthermore, minute cracks etc. can also be confirmed.

Furthermore, the operator can record audio information such as comments at the inspection target position via the microphone, which can be used as a reference when examining cracks and the like later.

On the other hand, as shown in FIG. 6, this is an example in which the piping defect inspection apparatus 1 of this example is connected to the network via the LAN I/F 12, and by configuring it in this way, the output of the piping defect inspection apparatus 1 of this example is can be sent to the server via the communications network. In this case, for example, it is also possible to send the captured image to a specialized organization to verify cracks and the like. Furthermore, by using the above-mentioned communication network, the operator himself/herself can remotely control the videoscope 2 and perform piping inspections even from a remote location.

Next, a method for repairing piping in which a defect has been detected by the above method will be described.
In this example, the piping is repaired by ceramic coating. Ceramic coatings are applied, for example, by arc spraying. Here, the formation of the ceramic layer specifically involves generating an arc discharge between two metal wires, melting the wires with this discharge energy, pulverizing the molten metal, and spraying it onto the inner circumferential surface of the piping to form a predetermined area. Form a ceramic layer with a thickness of .

FIG. 7 is a diagram showing an example of arc spraying onto the inner circumferential surface of the oil supply pipe 22 by the arc spraying machine 36. This arc spraying machine 36 is attached to the tip of the videoscope 2 described above, and as shown in the figure, the head of the arc spraying machine 36 is made to face the inner peripheral surface of the oil supply pipe 22, and the inner peripheral surface of the oil supply pipe 22 is A ceramic coating is applied to the defective portion 2a. For this reason, when using the arc spraying machine 36, a path for sending the metal wire and compressed air, which will be described later, into the videoscope 2 is secured, and a defect repair unit (not shown) is set in the internal health investigation device 1 and executed. .

The arc spraying machine 36 uses a ceramic metal wire 38 to which an anode is applied and a metal wire 39 to which a cathode is applied. The ceramic metal wire 38 extends through a nozzle 41 to the arc forming part 40, and the metal wire 39 42 to the arc forming part 40, generating an electric spark in the arc forming part 40, and both wires 38, 39 are melted. Further, compressed air is sent to the arc forming section 40 through a nozzle d to atomize the molten ceramic metal and spray it onto the defective portion 2 a on the inner circumferential surface of the oil supply pipe 22 .

Furthermore, the arc spraying machine 36 is rotatable in the directions of arrows a and b shown in FIG. do.

The drive of the arc spraying machine 36 is controlled by the control of the internal health inspection device 1 described above, and for example, the moving speed and direction of the arc spraying machine 36 are determined based on pre-stored information. A uniform ceramic layer is thermally sprayed onto the defective portion 2a on the circumferential surface. Specifically, under the control of the CPU 9, a program stored in the ROM 10 is read into the RAM 11 and executed, thereby controlling the arc spraying control section 16 and controlling the drive of ceramic spraying by the arc spraying machine 36. Note that the captured image processing unit 8 outputs an image of the thermal spraying state during arc thermal spraying to the monitor 5.

By controlling in this manner, detected defects in the oil supply pipe 22 can be repaired by ceramic coating.

Although ceramic coating is used in the above description of this example, defects in the oil supply pipe 22 may be repaired by other coating treatments such as zinc coating. Further, although the above example has been explained regarding the oil supply pipe 22, the oil supply pipe 23 may also be similarly inspected for defects and the defect detection portion may be repaired. Furthermore, defect inspection and repair processing can be performed not only on buried piping at gas stations but also on general buried piping through which gasoline, light oil, heavy oil, etc. flow, by the piping defect inspection apparatus 1 of this embodiment.

1... Internal soundness investigation device 2... Video scope 3... Control unit 4... Controller 5... Monitor 6... Power supply section 7... Control unit 8... Captured image Processing unit 9...CPU
10...ROM
11...RAM
12... LAN I/F
13...USBI/F
14...Input I/F
15...Microphone input processing unit 16...Arc welding control unit 17...Operation input unit 21...Underground tank 22...Lubrication pipe 23...Oil supply pipe 24...Vent pipe 25...Liquid level gauge 26...Lubrication Port 27...Equipment 28, 29...Valve 30...Vent hole 31...Videoscope tip 31a...Light emitting part 32, 33...Bending part 36...Arc spraying machine 38...Ceramic metal wire 39...Metal wire 40...Arc forming part 41, 42...Nozzle

Claims (1)

a videoscope, a processing means for processing a captured image taken by the videoscope, a monitor for displaying the captured image, and a recording means for recording the captured image and a standard sample image of normal piping measured in advance. , microphone input processing means for recording information corresponding to the captured image collected by the microphone in the recording means,
A buried pipe inspection device that inserts the videoscope into the buried pipe installed at a gas station, operates a controller based on the captured image displayed on the monitor, and inspects for cracks and corrosion defects in the buried pipe. And,
Further, an arc welding section is installed at the tip of the videoscope, and when the defect in the buried pipe is detected, a ceramic metal wire is supplied to the arc welding section, and ceramic arc spraying is performed to fix the defect. An inspection device for buried piping that forms and repairs a ceramic layer with a thickness of
When repairing defects in the piping, the standard sample image recorded in advance on the recording means is compared with the measurement image, and the measurement image recorded on the recording means using the microphone input processing means is repaired. An inspection device for buried piping, characterized in that repair is carried out with reference to information corresponding to the captured image from a microphone at a position to be inspected .

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