JP4379996B2 - Coating film deterioration diagnosis method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating film deterioration diagnosis method and apparatus, and in particular, a coating film deterioration that can efficiently diagnose the deterioration state of a coating film, and anyone can easily and accurately diagnose regardless of individual skills. The present invention relates to a diagnostic method and apparatus.
[0002]
[Prior art]
FIG. 5 shows an example of a concrete reactor containment vessel (PCV). The reactor containment vessel includes a hollow containment main body 2 erected on the foundation 1, and the inside of the containment vessel main body 2. A cylindrical pedestal 4 standing on the foundation 1 and supporting the reactor pressure vessel 3 at the top, and an intermediate portion in the vertical direction of the inner peripheral surface of the containment vessel body 2 to the upper portion of the pedestal 4 A diaphragm floor 5 extending substantially horizontally toward the top and a top head 6 for closing the upper opening of the reactor pressure vessel 3 are provided.
[0003]
The containment vessel body 2, the pedestal 4, and the diaphragm floor 5 are integrally formed of a reinforced concrete structure, and a steel liner 7 extending along the inner circumference surface is provided on the inner circumference surface of the containment vessel body 2. The airtightness between the outside and the outside is maintained.
[0004]
In the upper dry well 8 which is a space surrounded by the upper surface of the diaphragm floor 5, the inner peripheral surface of the containment vessel body 2, and the lower surface of the top head 6, pipes 9 connected to the reactor pressure vessel 3 and various devices are provided. Has been placed.
[0005]
Further, the upper surface of the foundation 1, the inner peripheral surface of the storage container body 2, the outer peripheral surface of the pedestal 4, the suppression chamber 10 (pressure suppression chamber) which is an annular space surrounded by the lower surface of the diaphragm floor 5, and the upper surface of the foundation 1. The suppression chamber 12 (internal pressure suppression chamber), which is a cylindrical space surrounded by the inner peripheral surface of the pedestal 4 and the lower surface of the floor 11 provided inside the pedestal 4, stores water 13 for condensing steam. The suppression chambers 10 and 12 communicate with each other through an opening 14 provided in the pedestal 4.
[0006]
A plurality of vent pipes 15 extending substantially vertically are disposed inside the suppression chamber 10, and the upper end of the vent pipe 15 is supported by the diaphragm floor 5 through the diaphragm floor 5. Is submerged in the water 13 stored in the suppression chamber 10, and when the pipe 9 such as the main steam pipe is broken by the vent pipe 15, the steam jetted to the upper dry well 8 is guided to the suppression chamber 10. The pressure rise in the upper dry well 8 is suppressed.
[0007]
Since the water 13 is stored in the suppression chambers 10 and 12, it is necessary to protect the liner 7 so as not to rust. To form.
[0008]
However, even if the inner surface of the liner 7 is coated in this way to form a coating film, water 13 penetrates into the liner 7 side through the coating film as time elapses. There is a problem that the bulging (water bubbles) is generated and the liner 7 is rusted.
[0009]
For this reason, it is regularly inspected whether the blister is generated on the coating film surface, or if the blister is generated, how much the coating film is deteriorating. If a large number of occurrences occur, the painting of the inner surfaces of the suppression chambers 10 and 12 is performed again.
[0010]
Conventionally, when diagnosing the deterioration state of the coating surface of the suppression chambers 10 and 12, first, the water 13 in the suppression chambers 10 and 12 is first discharged to the outside, the coating surface is washed, and then the coating surface is removed. The amount of blisters that are generated per unit area (for example, 10 cm x 10 cm) of the coating film surface, based on the photograph or video obtained by shooting with the camera, and the area occupied by the blisters A person with experience observes this visually to diagnose the deterioration of the coating film.
[0011]
[Problems to be solved by the invention]
However, in the past, since the diagnosis of the coating film was diagnosed by the visual observation of an experienced person, only a limited number of workers can be diagnosed, and further, the diagnosis takes time and the work efficiency is poor. Had a problem.
[0012]
In addition, blisters may be difficult to distinguish depending on the shooting conditions, and this requires careful attention to the diagnosis. Had.
[0013]
The present invention is intended to solve the problems of the conventional method, and can efficiently diagnose the deterioration state of the coating film, and anyone can easily and accurately diagnose regardless of the skill of the individual. It aims at providing the coating-film deterioration diagnostic method and apparatus which enabled it.
[0014]
[Means for Solving the Problems]
The present invention relates to a method for diagnosing deterioration of a coating film by observing blisters generated on the coating film surface, and diagnosing the deterioration state of the coating film at an angle less than 90 ° with respect to the coating film surface. By projecting light onto the paint film surface, the blister creates a shadow on the paint film surface, and the shadow pattern created by the blister is photographed with a camera from the direction perpendicular to the paint film surface. The present invention relates to a coating film deterioration diagnosis method, characterized by processing and diagnosing a deterioration state of a coating film based on an image processing result.
[0015]
In the above means, the area ratio of the shadow pattern in the unit area of the image and the distribution of the individual sizes of the shadow pattern in the unit area of the image may be obtained by image processing.
[0016]
The present invention also provides a detection frame that is supported by contacting a leg to the coating surface, and an inclination angle smaller than 90 ° with respect to the coating surface that is installed on the detection frame. A projector for projecting directional light, a camera that is installed on a detection stand and projects a film surface projected by the projector from a direction perpendicular to the coating film surface, and an image processing device that processes an image signal captured by the camera And a coating film deterioration diagnosis apparatus characterized by comprising:
[0017]
The present invention operates as follows.
[0018]
By projecting light at an inclination angle of less than 90 ° to the coating surface, a shadow by the blister is generated on the coating surface, and in this state, the coating surface is photographed with a camera from the vertical direction. The shadow pattern can be taken clearly. The image signal obtained in this way is guided to an image processing apparatus to perform image processing, whereby the area ratio of the shadow pattern in the unit area and the distribution of the individual sizes of the shadow pattern in the unit area of the image are obtained. Determining the coating film by simply looking at the numerical values to determine whether the area ratio of the shadow pattern and the distribution of individual sizes of the shadow pattern exceed a set value Can be diagnosed immediately and accurately. Therefore, it is possible to accurately diagnose the state of deterioration of the coating film easily and without causing individual differences.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
[0020]
1 to 3 show an example of a coating film deterioration diagnosis apparatus of the present invention. In the figure, reference numeral 16 denotes a detection frame, and the detection frame 16 is fixed between a front side base 17 and a rear side base 18 by a guide material 19 having a required length. Front legs 20 and 21 are provided, and one rear leg 22 extending perpendicularly to the rear stage 18 is provided at the lower part of the rear stage 18 . Accordingly, the guide member 19 is supported on the coating film 23 by the three legs 20, 21, 22 so as to be substantially parallel to the coating film surface P of the liner 7.
[0021]
The front legs 20 and 21 are inclined so as to be spaced apart from each other downward, and the front legs 20 and 21 are elongated by an outer cylinder 24a and an inner cylinder 24b that are fitted to each other. The wheel 25 is attached to the lower end of each inner cylinder 24b.
[0022]
The rear leg 22 is also configured to be adjustable in length by an outer cylinder 24a and an inner cylinder 24b that are fitted together, and a caster 26 is attached to the lower end of the inner cylinder 24b.
[0023]
A slide base 27 is movably provided along the length direction of the guide member 19 of the detection base 16, and the slide base 27 has an inclination angle smaller than 90 ° with respect to the coating surface P. A light projector 28 having α and projecting the light S toward the coating surface P is provided. The projector 28 is attached to the slide table 27 so that the inclination angle α can be adjusted arbitrarily.
[0024]
Further, the front stage 17 is a television camera capable of photographing the coating film surface P onto which the light is projected by the projector 28 as shown by a broken line perpendicularly to the coating film surface P from above and transmitting an image signal. A camera 29 such as a digital camera is provided.
[0025]
Furthermore, an image signal photographed by the camera 29 is guided to the image processing device 31 via the cable 30, and the image processing device 31 performs image processing. The image processing apparatus 31 may be provided with a display device such as a display capable of displaying the result of the image processing, and a display provided separately from the image processing apparatus 31 as shown in FIGS. The image processing result may be displayed on a display device 32 such as a device or a printout device. The image processing device 31 may be installed on the detection frame 16 or near the detection frame 16, but it is separated from the upper part of the diaphragm floor 5 or the outside of the storage container body 2 so that the diagnostic work can be easily performed. You may make it provide in a place.
[0026]
The detection frame 16 is configured to be lightweight and can be carried and held by an operator by hand, or can be easily moved by running on the coating film 23 by wheels 25 and casters 26. Further, the front legs 20 and 21 and the rear legs 22 may be configured to be foldable.
[0027]
The operation of the above embodiment will be described below.
[0028]
When the deterioration of the coating film 23 is diagnosed by the apparatus shown in FIGS. 1 to 3, the height of the guide material 19 is adjusted by adjusting the lengths of the front legs 20 and 21 and the rear legs 22 in advance. . Furthermore, while adjusting the space | interval position of the slide stand 27 with respect to the camera 29, adjusting the direction of the light projector 28, the inclination angle (alpha) of the light S projected on the coating-film surface P of the lower part of the camera 29 is blister of coating-film surface P The angle is adjusted so as to be the most suitable for detecting. At this time, if the inclination angle α is reduced, the shadow caused by the blister becomes longer, and even a blister with a small bulge can be detected.
[0029]
As described above, the position and angle of the projector 28 are set so that the light S is projected onto the coating film surface P at the inclination angle α that is most effective for blister detection, and thereafter, the detection operation is performed while maintaining the set state. I do.
[0030]
When the light S is projected onto the coating film surface P by the projector 28 at an inclination angle α, if blisters are generated on the coating film surface P, as shown in FIG. A shadow 33 will be produced.
[0031]
Accordingly, when the coating film surface P is photographed by the camera 29, the pattern of the shadow 33 is clearly photographed, and this image signal is guided to the image processing device 31 via the cable 30.
[0032]
The image processing device 31 performs image processing to determine the area ratio of the pattern of the shadow 33 in the unit area, the distribution of individual sizes of the pattern of the shadow 33 in the unit area of the image, and the like. The processing result of the image processing device 31 can be displayed numerically on the display device 32.
[0033]
The area ratio of the shadow 33 displayed on the display device 32 represents the amount of blisters generated, and the distribution of individual sizes of the pattern of the shadow 33 is large when the distribution of the shadow 33 having a large area is large. It shows that the deterioration of is progressing.
[0034]
Accordingly, the operator numerically determines whether or not the area ratio of the pattern of the shadow 33 displayed on the display device 32 and the distribution of the individual sizes of the pattern of the shadow 33 exceed a set value. It is possible to immediately and accurately diagnose the deterioration state of the coating film 23 only by making a judgment by looking at. Therefore, the state of deterioration of the coating film 23 can be easily diagnosed easily and without causing individual differences.
[0035]
In the above description of the embodiment, the case of diagnosing the deterioration of the coating film provided on the liner of the suppression chamber of the reactor containment vessel has been described. However, the diagnosis of the deterioration of the coating film applied to various containers and the like has been described. In addition to the coating film on the bottom surface, it is possible to adopt various configurations for the detection platform, and to provide a magnet or the like instead of the wheels and casters so that the work platform can be attracted to the steel plate. Needless to say, the present invention can be applied to the diagnosis of coating films and the like, and various modifications can be made without departing from the scope of the present invention.
[0036]
【The invention's effect】
According to the present invention, light is projected onto the coating film surface at an inclination angle of less than 90 ° to cause a blister shadow on the coating film surface. In this state, the coating film surface is photographed with a camera from the vertical direction. By doing so, the shadow pattern of the blister can be photographed clearly. The image signal obtained in this way is guided to an image processing apparatus to perform image processing, whereby the area ratio of the shadow pattern in the unit area and the distribution of the individual sizes of the shadow pattern in the unit area of the image are obtained. Determining the coating film by simply looking at the numerical values to determine whether the area ratio of the shadow pattern and the distribution of individual sizes of the shadow pattern exceed a set value Can be diagnosed immediately and accurately. Therefore, it is possible to achieve an excellent effect that the state of deterioration of the coating film can be easily diagnosed easily and without causing individual differences.
[Brief description of the drawings]
FIG. 1 is a side view showing a form example of a coating film deterioration diagnosis apparatus of the present invention.
FIG. 2 is a view taken in the direction of arrows II-II in FIG.
3 is a view taken in the direction of arrows III-III in FIG.
FIG. 4 is a plan view showing a state in which a blister shadow is generated on a coating film surface by light projection in the present invention.
FIG. 5 is a cut side view showing an example of a concrete reactor containment vessel (PCV).
[Explanation of symbols]
7 Steel liner (liner)
16 Detection stand 23 Coating film 28 Projector 29 Camera 31 Image processing device 33 Shadow P Coating film surface S Light α Inclination angle (angle)

Claims (3)

A method for diagnosing the deterioration of a coating film by observing blisters formed on the coating film surface, and illuminating the coating film at an inclined angle smaller than 90 ° with respect to the coating film surface. By projecting toward the surface, a blister shadow is produced on the coating surface, and the shadow pattern created by the blister is photographed with a camera from the direction perpendicular to the coating surface. A method for diagnosing coating film deterioration, comprising diagnosing the deterioration state of a coating film based on an image processing result.   2. The area ratio of the shadow pattern in the unit area of the image and the distribution of the individual sizes of the shadow pattern in the unit area of the image are obtained by image processing. Coating film deterioration diagnosis method. A detection stand that is supported by contacting the legs with the coating surface, and a projector that is installed on the detection stand and projects light toward the coating surface with an inclination angle smaller than 90 ° with respect to the coating surface. And a camera that shoots the coating film surface that is installed on the detection stand and projected by the projector from a direction perpendicular to the coating film surface, and an image processing device that processes an image signal captured by the camera. Characterized coating film deterioration diagnosis device.

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