JP2022053927A - Method for monitoring, monitoring system, and monitoring program - Google Patents

Abstract

To increase the accuracy and the efficiency of inspecting a concrete structure at the same time.SOLUTION: A method for monitoring according to an aspect of the present disclosure is a method for monitoring a concrete structure including: a concrete-containing structure; and a coating layer on a surface of the structure, the coating layer being capable of transmitting visible light. The method for monitoring includes the steps of: acquiring first state information showing the state of a structure in a monitor region set in the outer surface of the concrete structure on the basis of visible light emitted through the coating layer after the light is reflected from the surface of the structure; and acquiring second state information showing the state of the coating layer in the monitor region on the basis of invisible light different from the visible light, which is emitted from the outer surface of the concrete structure. The coating layer includes an additive which absorbs or reflects invisible light.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to monitoring methods, monitoring systems, and monitoring programs.

In recent years, the problem of falling concrete pieces from structures including concrete (hereinafter, also referred to as "structures" or "concrete structures") such as tunnel inner walls, highway piers, railway piers, bridges and buildings has become a problem. It has become. Examples of the fall of concrete pieces include cases where the surface of concrete deteriorates due to some deterioration factor and small concrete pieces peel off from the mother body, and cases where peeling progresses as described above and relatively large concrete pieces fall off from the mother body. And so on.

For example, Patent Document 1 discloses a method for diagnosing concrete for optically diagnosing the soundness of a concrete building. In this diagnostic method, the concrete surface is irradiated with near infrared rays, and the light reflected from the concrete surface is spectrally analyzed in a predetermined wavelength range to diagnose the deterioration of the concrete.

Further, Patent Document 2 discloses a monitoring method for easily detecting deterioration of a structure or the like. In this monitoring method, infrared rays radiated from the area of the surface of the object to which the paint film is applied are detected by the infrared sensor.

Japanese Unexamined Patent Publication No. 2008-14779 International Publication No. 2018/105242

In the technique described in Patent Document 1, the soundness of only a concrete building is diagnosed, and it is not assumed that a coating film is used on the surface of concrete (structure). Further, in the technique described in Patent Document 2, the coating film is inspected, the deterioration diagnosis of the coating film is performed, and the deterioration diagnosis of the object is performed from the diagnosis result. The deterioration to be diagnosed is based on the premise that the cracks of the object (structure) and the cracks of the coating film match, for example, and the diagnosis of only the object and the diagnosis of only the coating film are not performed. .. In order to show the soundness of the concrete structure having the structure and the coating film, it is possible to judge the deterioration status at an early stage by inspecting and diagnosing the structure and the coating film, respectively, and repair as necessary. Desired.

Therefore, the present disclosure provides a monitoring method, a monitoring system, and a monitoring program capable of improving the inspection accuracy while improving the efficiency of inspection of concrete structures.

The monitoring method according to one aspect of the present disclosure is a monitoring method for a concrete structure having a structure containing concrete and a coating layer provided on the surface of the structure and capable of transmitting visible light. This monitoring method is a first state information indicating the state of the structure in the monitoring area set on the outer surface of the concrete structure based on the visible light emitted through the coating layer after reflecting on the surface of the structure. A step of acquiring a second state information indicating the state of the coating layer in the monitoring region based on invisible light emitted from the outer surface of the concrete structure and different from visible light is included. The coating layer contains additives that absorb or reflect invisible light.

In this monitoring method, since the coating layer is formed so as to be able to transmit visible light, the first state information indicating the state of the structure covered by the coating layer is acquired based on the visible light. Further, since the coating layer contains an additive that absorbs or reflects invisible light different from visible light, the second state information indicating the state of the coating layer is acquired based on the invisible light. Therefore, in the monitoring area, the structure can be inspected by using the first state information, and the coating layer can be inspected by using the second state information. As a result, the inspection of the structure and the inspection of the coating layer can be performed in parallel for one monitoring area, so that the efficiency of the inspection of the concrete structure can be improved. Further, since both the structure and the coating layer can be inspected, it is possible to improve the inspection accuracy of the concrete structure.

The monitoring method includes a step of determining the degree of deterioration of the structure in the monitoring area based on the first state information, and a step of determining the degree of deterioration of the coating layer in the monitoring area based on the second state information. , May be further included. In this case, since the concrete structure can be inspected by using the respective judgment results of the degree of deterioration of the structure and the coating layer based on the first state information and the second state information, the inspection accuracy of the concrete structure can be performed. Can be further improved.

In the step of determining the degree of deterioration of the structure, the structure is based on the first state information and the information indicating the state of the structure in the monitoring area acquired before the date and time when the first state information was acquired. The degree of deterioration of the body may be determined. In this case, by comparing the first state information with the corresponding previously acquired information, it is possible to more reliably determine the deterioration of the structure due to aging. As a result, it becomes possible to further improve the inspection accuracy of the concrete structure.

In the step of determining the degree of deterioration of the coating layer, the coating is based on the second state information and the information indicating the state of the coating layer in the monitoring area acquired before the date and time when the second state information was acquired. The degree of layer deterioration may be determined. In this case, by comparing the second state information with the corresponding previously acquired information, it is possible to more reliably determine the deterioration of the coating layer due to aging. As a result, it becomes possible to further improve the inspection accuracy of the concrete structure.

In the step of determining the degree of deterioration of the structure, even if the degree of deterioration of the structure is determined based on the first state information and the information indicating the state of the structure in the area located around the monitoring area. good. In this case, by comparing the first state information with the corresponding information in the area around the monitoring area, the deterioration of the structure can be determined more reliably. As a result, it becomes possible to further improve the inspection accuracy of the concrete structure.

In the step of determining the degree of deterioration of the coating layer, even if the degree of deterioration of the coating layer is determined based on the second state information and the information indicating the state of the coating layer in the region located around the monitoring area. good. In this case, by comparing the second state information with the corresponding information in the area around the monitoring area, the deterioration of the coating layer can be determined more reliably. As a result, it becomes possible to further improve the inspection accuracy of the concrete structure.

The monitoring method may further include a step of acquiring position information indicating the position of the monitoring area, and a step of storing each of the first state information and the second state information in association with the position information. In this case, it becomes easy to refer to the state information when inspecting one monitoring area based on the stored first state information and the second state information. As a result, it becomes possible to further improve the efficiency of inspection of concrete structures.

The coating layer may include a functional layer and a deterioration diagnosis layer arranged along a direction intersecting the surface of the structure. The deterioration diagnosis layer may contain an additive. In this case, by containing the additive, it is possible to form a coating layer applicable to this monitoring method without impairing the original function of the coating layer.

The total light transmittance of the coating layer may be 30% or more. In this case, it is easy to observe the surface of the structure through the coating layer.

The monitoring system according to one aspect of the present disclosure is a monitoring system for a concrete structure having a structure containing concrete and a coating layer provided on the surface of the structure and capable of transmitting visible light. This monitoring system is a first state that detects the state of the structure in the monitoring area set on the outer surface of the concrete structure based on the visible light emitted through the coating layer after reflecting on the surface of the structure. It includes a detection unit and a second state detection unit that detects the state of the coating layer in the monitoring region based on invisible light emitted from the outer surface of the concrete structure and different from visible light. The coating layer contains additives that absorb or reflect invisible light.

In this monitoring system, since the coating layer is formed so as to be able to transmit visible light, the state of the structure covered by the coating layer is acquired by the first state detection unit based on the visible light. Further, since the coating layer contains an additive that absorbs or reflects invisible light different from visible light, the state of the coating layer is acquired based on the invisible light by the second state detection unit. Therefore, in the monitoring area, the structure can be inspected using the detection result of the state of the structure based on visible light, and the inspection of the coating layer can be performed using the detection result of the state of the coating layer based on invisible light. It can be carried out. As a result, the inspection of the structure and the inspection of the coating layer can be performed in parallel for one monitoring area, so that the efficiency of the inspection of the concrete structure can be improved. Further, since both the structure and the coating layer can be inspected, it is possible to improve the inspection accuracy of the concrete structure.

The monitoring program according to one aspect of the present disclosure causes a computer to execute a monitoring method for a concrete structure having a structure containing concrete and a coating layer provided on the surface of the structure and capable of transmitting visible light. It is a program. The above monitoring method is a first state information indicating the state of the structure in the monitoring area set on the outer surface of the concrete structure based on the visible light emitted through the coating layer after reflecting the surface of the structure. A step of acquiring a second state information indicating the state of the coating layer in the monitoring region based on invisible light emitted from the outer surface of the concrete structure and different from visible light is included. The coating layer contains additives that absorb or reflect invisible light. In this monitoring program, it is possible to improve the inspection accuracy while improving the efficiency of the inspection of the concrete structure in the same manner as the above-mentioned monitoring method.

According to the present disclosure, a monitoring method, a monitoring system, and a monitoring program capable of improving the inspection accuracy while improving the efficiency of inspection of a concrete structure are provided.

FIG. 1 is a schematic diagram showing an example of a monitoring system and a concrete structure according to an embodiment. FIG. 2 is a block diagram showing an example of the hardware configuration of the inspection device. FIG. 3 is a block diagram showing an example of the functional configuration of the inspection device. FIG. 4 is a flowchart showing an example of the monitoring method. FIG. 5 is a schematic diagram showing an example of a monitoring system and a concrete structure according to a modified example. FIG. 6A is an image of a test piece having no deterioration diagnosis layer taken by an infrared camera. FIG. 6B is an image of a test piece having a deterioration diagnosis layer taken by an infrared camera. 7 (a) to 7 (c) are images of a test piece having no deterioration diagnosis layer taken under different conditions. 7 (d) to 7 (f) are images of a test piece having a deterioration diagnosis layer taken under different conditions. 8 (a) to 8 (c) are images of a test piece having no deterioration diagnosis layer taken under different conditions. 8 (d) to 8 (f) are images of a test piece having a deterioration diagnosis layer taken under different conditions.

Hereinafter, one embodiment will be described with reference to the drawings. In the description, the same elements or elements having the same function are designated by the same reference numerals, and duplicate description will be omitted. Unless otherwise specified, the materials exemplified in the present specification may be used alone or in combination of two or more.

FIG. 1 schematically shows an example of a cross section of a monitoring system and a concrete structure according to an embodiment. The monitoring system 1 shown in FIG. 1 is a system for monitoring the concrete structure 100. The monitoring system 1 is used in at least a part of the inspection work for diagnosing the deterioration of the concrete structure 100.

[Concrete structure]
First, the concrete structure 100 to be monitored by the monitoring system 1 will be described. The concrete structure 100 has a structure 110 including concrete (hereinafter, simply referred to as “structure 110”) and a coating layer 120. Examples of the structure 110 include highway piers, railway piers, bridges, tunnel inner walls, tiles, and the like.

The coating layer 120 is a layer provided on the surface 112 of the structure 110. The coating layer 120 constitutes the outer surface 102 of the concrete structure 100. The coating layer 120 has a function of preventing the concrete pieces and the like generated from the structure 110 from being peeled off, and a function of preventing the invasion of factors that affect the deterioration of the structure 110. The coating layer 120 may be deteriorated by some deterioration factor, and a part thereof may be separated from the structure 110. If the coating layer 120 is peeled off, the above-mentioned functions (peeling prevention function and intrusion prevention function) may not be sufficiently exerted, and the structure 110 may be adversely affected (for example, deterioration may progress).

The coating layer 120 is formed so as to allow the transmission of visible light. The wavelength of visible light is, for example, 380 nm to 780 nm. The coating layer 120 may be transparent to visible light, colorless and transparent, or may be slightly colored or slightly turbid.

The transparency of the coating layer 120 can be expressed, for example, by the visible crack width. In the coating layer 120, the visible crack width is, for example, 0.5 mm or less, 0.3 mm or less, or 0.2 mm or less. When the transparency (visible crack width) of the coating layer 120 is within the above range, it is possible to confirm the occurrence of deterioration on the surface 112 of the structure 110 at an early stage and easily.

Transparency (visible crack width) in the present specification is clearly defined by drawing a plurality of black lines of various widths on a slate plate using a writing tool and placing a coating film consisting of a coating layer on the upper surface thereof. It means a qualitative value that evaluates the maximum value of the visible width. The smaller the visible crack width, the higher the transparency.

The total light transmittance of the coating layer 120 is, for example, 30% or more, 40% or more, or 50% or more. When the total light transmittance of the coating layer 120 is within the above range, the transparency of the coating layer 120 is high, the surface 112 of the structure 110 is easily visible in the concrete structure 100, and deterioration such as cracks on the surface 112 is easy to see. It is easy to confirm the occurrence of.

The total light transmittance in the present specification means a value obtained in accordance with JIS K 7375: 2008 "Plastic-How to obtain total light transmittance and total light reflectance". Specifically, the total light transmittance can be measured using a turbidity meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name: NDH4000).

The coating layer 120 illustrated in FIG. 1 has a functional layer 130 and a deterioration diagnosis layer 140. The functional layer 130 and the deterioration diagnosis layer 140 are arranged along a direction intersecting the surface 112 of the structure 110 (for example, a direction orthogonal to each other). For example, the functional layer 130 and the deterioration diagnosis layer 140 are laminated in this order from the surface 112 of the structure 110.

The functional layer 130 has a function of preventing peeling of concrete pieces and the like that may occur due to deterioration of the structure 110 (for example, deterioration over time) in the concrete structure 100, and intrusion of factors acting on the deterioration of the structure 110. It is a layer having a function of preventing. The functional layer 130 may be adhered to the surface 112 of the structure 110 via a primer layer (adhesive layer) (not shown). The primer layer contains, for example, at least one selected from the group consisting of a cured product of an acrylic resin, a cured product of a urethane resin, and a cured product of an epoxy resin.

The functional layer 130 is formed so as to allow transmission of visible light. The functional layer 130 may be transparent to visible light, colorless and transparent, or may be slightly colored or slightly turbid. The target crack width representing the transparency of the functional layer 130 is, for example, 0.4 mm or less, 0.3 mm or less, or 0.2 mm or less. When the transparency (visible crack width) of the functional layer 130 is within the above range, the transparency of the coating layer 120 can be improved.

The total light transmittance of the functional layer 130 is, for example, 35% or more, 45% or more, or 50% or more. When the total light transmittance of the functional layer 130 is within the above range, the transparency of the coating layer 120 can be improved.

As described above, the functional layer 130 is formed so as to have high transparency and total light transmittance. The visible crack width of the functional layer 130 may be 0.4 mm or less and the total light transmittance of the functional layer 130 may be 35% or more, or the visible crack width of the functional layer 130 is 0.2 mm or less. Moreover, the total light transmittance of the functional layer 130 may be 50% or more.

The functional layer 130 is also referred to as a resin cured layer because it is formed by applying a resin composition on the structure 110 and curing the resin composition. The material constituting the functional layer 130 is not particularly limited, but for example, the functional layer 130 may contain at least one selected from the group consisting of acrylic resin, epoxy resin, urea resin, polyurethane resin, and polyurethane urea resin. It may be made of polyurethane urea resin.

The thickness of the functional layer 130 is, for example, 0.3 mm or more, 0.4 mm or more, or 0.5 mm or more. When the thickness of the functional layer 130 is within the above range, the load resistance and the blocking property of the concrete structure 100 can be improved. The thickness of the functional layer 130 is, for example, 5 mm or less, 4 mm or less, 3 mm or less, or 2 mm or less. When the thickness of the functional layer 130 is within the above range, the workability can be facilitated and the construction cost can be reduced. The thickness of the functional layer 130 can be adjusted within the above range, and may be, for example, 0.3 mm to 5 mm or 0.5 mm to 2 mm.

The deterioration diagnosis layer 140 is a layer for diagnosing the degree of deterioration of the coating layer 120 (functional layer 130). The deterioration diagnosis layer 140 contains an additive that absorbs or reflects light different from visible light (light having a wavelength different from that of visible light). More specifically, the deterioration diagnostic layer 140 contains an additive that absorbs or reflects light in a specific wavelength range different from the wavelength region of visible light. For example, the deterioration diagnosis layer 140 contains an additive that absorbs infrared rays as light different from visible light (hereinafter, referred to as “invisible light”). The deterioration diagnosis layer 140 may be formed by adding the above additive to the same material as the resin composition constituting the functional layer 130.

The additive contained in the deterioration diagnosis layer 140 and absorbing (heat shielding) infrared rays may be an organic compound or an inorganic compound. Examples of the organic compound include a cyanine compound, a thiol nickel complex salt compound, a phthalocyanine compound, a triallylmethane compound, a naphthoquinone compound, an anthraquinone compound and the like.

Examples of inorganic compounds include antimony oxide (ATO), indium tin oxide (ITO), titanium oxide, aluminum oxide, cerium oxide, ruthenium oxide, silicon oxide, zirconium oxide, tantalum oxide, yttrium oxide, iridium oxide, and aluminum oxide. , Zinc oxide, or fine particles of a metal oxide containing tungsten oxide as a main component.

The thickness of the deterioration diagnosis layer 140 is thinner than that of the functional layer 130. The thickness of the deterioration diagnosis layer 140 is, for example, 300 μm or less, 200 μm or less, 100 μm or less, or 50 μm or less. The thickness of the deterioration diagnosis layer 140 and the amount of the additive contained in the deterioration diagnosis layer 140 are adjusted so that the surface 112 of the structure 110 can be visually recognized in the concrete structure 100. As described above, the coating layer 120 contains an additive that absorbs or reflects invisible light having a wavelength region different from that of visible light. The wavelength of invisible light is, for example, in the range other than 380 nm to 780 nm (shorter than 380 nm or longer than 780 nm). Infrared light is an example of invisible light. The wavelength of infrared rays is, for example, 780 nm to 1000 μm. In the following, a case where the coating layer 120 contains an infrared absorber that absorbs infrared rays as an additive will be exemplified.

[Monitoring system]
Subsequently, an example of the monitoring system 1 will be described in detail with reference to FIGS. 2 and 3. The monitoring system 1 monitors the state of the concrete structure 100 in the area to be monitored (hereinafter referred to as “monitoring area SA”) set in at least a part of the outer surface 102. The state of the concrete structure 100 in the monitoring area SA includes not only the state of the outer surface 102 but also the state of the inside near the outer surface 102 (the area near the surface 112 of the coating layer 120 and the structure 110). The monitoring area SA is set, for example, in a two-dimensional area of a part of the outer surface 102 of the concrete structure 100. The monitoring area SA may be preset by an operator or the like who performs an inspection of the concrete structure 100. As shown in FIG. 1, the monitoring system 1 includes a first state detection unit 10, a second state detection unit 20, and an inspection device 30.

The first state detection unit 10 is a device that detects the state of the structure 110 in the monitoring area SA based on the visible light emitted from the outer surface 102 of the concrete structure 100. The first state detection unit 10 is arranged so as to face the outer surface 102 of the concrete structure 100. The coating layer 120 provided on the surface 112 of the structure 110 is capable of transmitting visible light. Therefore, when sunlight is applied to the outer surface 102 of the concrete structure 100 during the daytime (Hyuga), the visible light reflected by the surface 112 of the structure 110 among the irradiated sunlight is the concrete structure 100. It is emitted from the outer surface 102 of the. As described above, the light emitted from the outer surface 102 of the concrete structure 100 includes visible light emitted through the coating layer 120 after reflecting the surface 112 of the structure 110.

The first state detection unit 10 has, for example, a camera 12 that captures a monitoring region SA based on visible light. The camera 12 may be a digital camera having an image pickup element such as a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and a lens for forming an image on the image pickup element. The camera 12 reflects visible light emitted from the concrete structure 100 (outer surface 102) through the coating layer 120 after reflecting the surface 112 of the structure 110, thereby forming a state of the structure 110 (surface 112). Generates visible light image data indicating the state of). The camera 12 outputs image data (hereinafter, referred to as “visible light image”) generated based on visible light to the inspection device 30.

The second state detection unit 20 is a device that detects the state of the coating layer 120 in the monitoring region SA based on the infrared rays emitted from the outer surface 102 of the concrete structure 100. The second state detection unit 20 is arranged so as to face the monitoring area SA of the concrete structure 100. The second state detection unit 20 is configured so that the first state detection unit 10 can detect the state of the coating layer 120 in the same monitoring area SA as the area for detecting the state of the structure 110 (surface 112). When the outer surface 102 of the concrete structure 100 is irradiated with sunlight in the daytime (Hyuga), a part of the infrared rays contained in the sunlight is absorbed by the infrared absorber contained in the coating layer 120. , Not emitted from the outer surface of the concrete structure 100. The other part of the infrared rays contained in the sunlight is emitted from the outer surface 102 of the concrete structure 100 without being absorbed by the infrared absorber.

The second state detection unit 20 has, for example, a camera 22 that captures a monitoring region SA based on infrared rays. The camera 22 may be an infrared camera. As the camera 22, a camera capable of taking an image based on near infrared rays, a camera capable of taking an image based on mid-infrared rays, or a camera capable of taking an image based on far infrared rays may be used. The camera 22 can capture the surveillance area SA as in the camera 12, but the field of view of the camera 22 and the field of view of the camera 12 do not have to completely match, and each field of view includes the monitoring area SA. I just need to be there. The camera 22 generates image data based on infrared rays (hereinafter referred to as “infrared image”) by forming an image of infrared rays emitted from the outer surface 102 of the concrete structure 100.

Since the coating layer 120 contains an infrared absorber, infrared rays corresponding to the state of the coating layer 120 are emitted from the concrete structure 100. Specifically, when the amount of the coating layer 120 remaining (residual amount) is large, the amount of the infrared absorber is also large, so that the intensity of the infrared rays emitted from the coating layer 120 is small. As the deterioration of the coating layer 120 progresses and the residual amount of the coating layer 120 decreases, the amount of the infrared absorber also decreases and the intensity of the infrared rays emitted from the concrete structure 100 increases. Therefore, the infrared image generated by the camera 22 includes information indicating the state of the coating layer 120. The camera 22 outputs the generated infrared image to the inspection device 30.

The inspection device 30 acquires information (for example, image data) indicating the state of the concrete structure 100 in the monitoring area SA from each of the first state detection unit 10 and the second state detection unit 20, and the concrete structure is based on the information. It is a computer device that performs a predetermined process for inspecting an object 100. The inspection device 30 includes, for example, a main body 32, a monitor 34, and an input device 36.

FIG. 2 shows an example of the hardware configuration of the inspection device 30. The main body 32 is a main body portion of a computer device and has a circuit 40 as shown in FIG. The circuit 40 includes at least one processor 42, a memory 44, a storage 46, and an input / output port 48. The storage 46 records a program for configuring each functional module described later. The storage 46 is a computer-readable recording medium such as a hard disk, a non-volatile semiconductor memory, a magnetic disk, an optical disk, or the like. The memory 44 temporarily stores the program loaded from the storage 46, the calculation result of the processor 42, and the like. The processor 42 constitutes each functional module by executing a program in cooperation with the memory 44. The input / output port 48 inputs / outputs an electric signal between the first state detection unit 10, the second state detection unit 20, the monitor 34, the input device 36, and the like in response to a command from the processor 42.

The monitor 34 is a device for displaying information output from the main body 32. The monitor 34 may be any monitor 34 as long as it can display information, and specific examples thereof include a liquid crystal panel and the like. The input device 36 is a device for inputting information to the main body 32. The input device 36 may be any as long as it can input desired information, and specific examples thereof include a keyboard, an operation panel, and a mouse. The monitor 34 and the input device 36 may be integrated as a touch panel. For example, as in a tablet computer, the main body 32, the monitor 34, and the input device 36 may be integrated.

FIG. 3 shows an example of the functional configuration of the inspection device 30. As shown in FIG. 3, the inspection device 30 (main body 32) has, as a functional configuration (hereinafter referred to as “functional module”), for example, an input information acquisition unit 52, a first detection control unit 54, and the like. It has a second detection control unit 56, a position information acquisition unit 58, a storage unit 62, a first deterioration determination unit 64, a second deterioration determination unit 66, and an output unit 68. The process executed by each of these functional modules corresponds to the process executed by the inspection device 30 (main body 32).

The input information acquisition unit 52 acquires information input via the input device 36. The input information acquisition unit 52 acquires input information from an operator or the like via, for example, the input device 36. The input information from the operator or the like may include information regarding the image pickup of the first state detection unit 10 by the camera 12 and the image pickup of the second state detection unit 20 by the camera 22.

The first detection control unit 54 acquires information (first state information) indicating the state of the structure 110 in the monitoring area SA from the first state detection unit 10. For example, the first detection control unit 54 controls the first state detection unit 10 so as to detect the state of the structure 110 in the monitoring area SA, and information indicating the state of the structure 110 in the monitoring area SA (first state). Information) is acquired. In one example, the first detection control unit 54 controls the camera 12 to image the monitoring region SA based on the visible light emitted from the outer surface 102 of the concrete structure 100, so that the image data of the monitoring region SA is captured. (The above visible light image showing the state of the surface 112) is acquired from the camera 12.

The second detection control unit 56 acquires information (second state information) indicating the state of the coating layer 120 in the monitoring area SA from the second state detection unit 20. For example, the second detection control unit 56 controls the second state detection unit 20 so as to detect the state of the coating layer 120 in the monitoring area SA, and information indicating the state of the coating layer 120 in the monitoring area SA (second state). Information) is acquired. In one example, the second detection control unit 56 controls the camera 22 to image the monitoring region SA based on the infrared rays emitted from the outer surface 102 of the concrete structure 100, so that the image data of the monitoring region SA ( The infrared image) showing the state of the coating layer 120 is acquired from the camera 22.

The position information acquisition unit 58 acquires information indicating the position of the monitoring area SA (hereinafter, referred to as “position information”). The position information acquisition unit 58 acquires, for example, the latitude and longitude at which the device is located as the position information from the GPS function provided in the main body 32, the first state detection unit 10 or the second state detection unit 20. The position information acquisition unit 58 is operated by the first state detection unit 10 and the second state detection unit 20 based on the input information from the operator or the like input via the input device 36 instead of the acquisition from the GPS function. The position information of the monitoring area SA, which is the area for which the information is acquired, may be acquired.

The storage unit 62 stores information indicating the state of the structure 110 (surface 112) acquired by the first detection control unit 54 and information indicating the state of the coating layer 120 acquired by the second detection control unit 56. In the storage unit 62, for example, the visible light image obtained by the camera 12 of the first state detection unit 10 capturing the monitoring area SA and the camera 22 of the second state detection unit 20 capture the same monitoring area SA. The infrared image obtained by this is stored. The storage unit 62 may store a plurality of visible light images (captured at different dates and times) and a plurality of infrared images acquired in a predetermined inspection cycle for the same monitoring area SA. The inspection cycle is predetermined, for example, by a worker or the like, and in one example, it is set once in January, half a year, one year, or several years.

The storage unit 62 may store each of the information indicating the information of the structure 110 and the information indicating the state of the coating layer 120 and the position information of the monitoring area SA in association with each other for the same monitoring area SA. .. Specifically, the storage unit 62 stores the visible light image and the position information of the monitoring area SA in association with each other for the same monitoring area SA, and associates the infrared image with the position information of the monitoring area SA. And remember.

The first deterioration determination unit 64 determines the degree of deterioration of the structure 110 based on the information indicating the state of the structure 110 (surface 112) acquired by the first detection control unit 54. The first deterioration determination unit 64 may determine the degree of damage on the surface 112 as the degree of deterioration of the structure 110. In one example, the first deterioration determination unit 64 calculates the brightness or brightness for each pixel in the visible light image, and extracts the pixels whose calculated brightness or brightness is below or exceeds a predetermined threshold value to determine the degree of deterioration. (For example, detect cracks). When determining the degree of deterioration of the surface 112, the first deterioration determination unit 64 may determine the stage of progress of the deterioration of the surface 112, and determines the presence or absence of deterioration (for example, cracks) of the surface 112. May be good.

The first deterioration determination unit 64 may determine the degree of deterioration of the surface 112 by comparing the visible light image captured by the camera 12 in the monitoring area SA with the reference image for the monitoring area SA. The reference image may be an image obtained by imaging based on visible light when the coating layer 120 is provided (coated) on the structure 110. Alternatively, the reference image is image data acquired by imaging the monitoring area SA based on visible light before the date and time when the visible light image to be determined for deterioration was acquired (for example, in the previous inspection cycle). It may be an acquired visible light image).

The second deterioration determination unit 66 determines the degree of deterioration of the coating layer 120 based on the information indicating the state of the coating layer 120 acquired by the second detection control unit 56. The second deterioration determination unit 66 may determine the residual amount of the deterioration diagnosis layer 140 of the coating layer 120 as the degree of deterioration of the coating layer 120. When the residual amount of the deterioration diagnosis layer 140 is small, it is presumed that the deterioration of the functional layer 130 and the coating layer 120 is progressing.

Since the camera 22 forms an image of infrared rays having an intensity corresponding to the residual amount of the deterioration diagnosis layer 140, the brightness or the brightness changes when the residual amount of the coating layer 120 changes. Therefore, the second deterioration determination unit 66 calculates the brightness or brightness for each pixel in the infrared image, extracts the pixels whose calculated brightness or brightness is below or exceeds a predetermined threshold value, and then determines the number of extracted pixels. The degree of deterioration may be determined accordingly. When determining the degree of deterioration of the coating layer 120, the second deterioration determination unit 66 may determine the stage of progress of deterioration of the coating layer 120, and the deterioration of the coating layer 120 (for example, peeling of the coating layer 120) may be determined. ) May be determined.

The second deterioration determination unit 66 may determine the degree of deterioration of the coating layer 120 by comparing the infrared image captured by the camera 22 in the monitoring area SA with the reference image for the monitoring area SA. The reference image may be an image obtained by imaging the monitoring region SA based on infrared rays when the coating layer 120 is provided (coated) on the structure 110. Alternatively, the reference image is image data acquired by imaging the monitoring area SA based on infrared rays before the date and time when the infrared image to be determined for deterioration was acquired (for example, acquired in the previous inspection cycle). It may be an infrared image).

The output unit 68 outputs the determination result by the first deterioration determination unit 64 and the determination result by the second deterioration determination unit 66 to the monitor 34. As a result, the determination result regarding the degree of deterioration of the structure 110 and the coating layer 120 is displayed on the monitor 34 and notified to the operator and the like. In addition to the deterioration determination result, the output unit 68 may output a visible light image, an infrared image, and position information associated with those images to the monitor 34.

[Monitoring method]
Subsequently, with reference to FIG. 4, a series of processes executed in the monitoring system 1 will be described as an example of the monitoring method. A series of processes (monitoring methods) performed in the monitoring system 1 is at least based on the visible light emitted through the coating layer 120 after reflecting the surface 112 of the structure 110, and the outer surface of the concrete structure 100. The monitoring area SA is based on the step of acquiring information indicating the state of the structure 110 in the monitoring area SA set in 102 and the invisible light emitted from the outer surface 102 of the concrete structure 100 and different from the visible light. Includes a step of acquiring information indicating the state of the coating layer 120 in the above.

FIG. 4 is a flowchart illustrating a monitoring method executed in the monitoring system 1. In this monitoring method, a series of processes is started in a state where the camera 12 of the first state detection unit 10 is arranged by an operator or the like so that the monitoring area SA can be imaged. First, the first detection control unit 54 of the inspection device 30 controls the camera 12 so as to image the monitoring area SA based on the visible light emitted from the outer surface 102 of the concrete structure 100, thereby controlling the monitoring area SA. Acquires a visible light image of (step S1). The first detection control unit 54 may cause the camera 12 to start imaging according to the input information from the worker acquired by the input information acquisition unit 52. After acquiring the visible light image, the camera 22 of the second state detection unit 20 is arranged by a worker or the like so that the monitoring area SA can be imaged.

Next, in step S1, the second detection control unit 56 of the inspection device 30 controls the camera 22 so as to image the monitoring region SA based on the infrared rays emitted from the outer surface 102 of the concrete structure 100. An infrared image is acquired for the same monitoring area SA as the area where the visible light image is obtained (step S2). The second detection control unit 56 may cause the camera 22 to start imaging according to the input information from the worker acquired by the input information acquisition unit 52.

Next, the position information acquisition unit 58 of the inspection device 30 acquires position information indicating the position of the monitoring area SA from which the visible light image and the infrared image have been acquired in steps S1 and S2 (step S3). The position information acquisition unit 58 uses, for example, the latitude and longitude at which the device is located as the position information from the GPS function provided in the main body 32 of the inspection device 30, the first state detection unit 10 or the second state detection unit 20. get.

Next, the storage unit 62 of the inspection device 30 stores the visible light image obtained in step S1 and the infrared image obtained in step S2 (step S4). The storage unit 62 stores, for example, the visible light image obtained in step S1 and the position information of the monitoring area SA obtained in the visible light image (position information obtained in step S3) in association with each other. Further, the storage unit 62 stores the infrared image obtained in step S2 in association with the position information of the monitoring area SA obtained in the infrared image (position information obtained in step S3).

Next, the first deterioration determination unit 64 of the inspection device 30 determines the degree of deterioration of the surface 112 in the structure 110 based on the visible light image obtained in step S1 (step S5). For example, in the visible light image obtained in step S1, the first deterioration determination unit 64 calculates the brightness or brightness for each pixel, and extracts pixels whose calculated brightness or brightness is below or exceeds a predetermined threshold value. To determine the degree of deterioration (for example, to detect cracks).

Next, the second deterioration determination unit 66 of the inspection device 30 determines the degree of deterioration of the coating layer 120 based on the infrared image obtained in step S2 (step S6). For example, in the infrared image obtained in step S2, the second deterioration determination unit 66 calculates the brightness or brightness for each pixel, extracts the pixels whose calculated brightness or brightness is below or exceeds a predetermined threshold value, and then extracts the pixels. The degree of deterioration is determined according to the number of pixels.

Next, the output unit 68 of the inspection device 30 outputs the determination result of the degree of deterioration of the surface 112 in step S5 and the determination result of the degree of deterioration of the coating layer 120 in step S6 to the monitor 34 (step). S7). By executing step S7, the determination result regarding the degree of deterioration of the surface 112 of the structure 110 and the coating layer 120 is displayed on the monitor 34 and notified to the operator and the like. If it is determined that the degree of deterioration is progressing, the monitoring area SA is repaired by an operator or the like.

The series of processes of the above steps S1 to S7 may be further performed for different monitoring areas SA of the concrete structure 100, or may be further performed for some monitoring areas SA of the other concrete structure 100. The series of processes of the above steps S1 to S7 may be further executed at different dates and times (for example, different times on the same day or different days) for the same monitoring area SA of the concrete structure 100.

A series of processes of steps S1 to S7 for the same monitoring area SA may be repeatedly executed according to a predetermined inspection cycle. In this case, a plurality of visible light images and a plurality of infrared images obtained in chronological order are stored in the storage unit 62 for the same monitoring area SA. In step S5, the first deterioration determination unit 64 may determine the degree of deterioration of the structure 110 (surface 112) based on a plurality of visible light images obtained along the time series. In step S6, the second deterioration determination unit 66 may determine the degree of deterioration of the coating layer 120 based on a plurality of infrared images obtained along the time series.

The series of processes described above is an example and can be changed as appropriate. In the above series of processes, the inspection device 30 may execute one step and the next step in parallel, or may execute each step in an order different from the above-mentioned example. The inspection device 30 may omit any step, or may execute a process different from the above-mentioned example in any step. The inspection device 30 may execute step S1 after executing step S2, for example. The inspection device 30 may execute step S2 for a period that overlaps with at least a part of the execution period of step S1.

The inspection device 30 does not have to execute the determination of the degree of deterioration in steps S5 and S6. In this case, the output unit 68 of the inspection device 30 may output the visible light image obtained in step S1 and the infrared image obtained in step S2 to the monitor 34. By checking the visible light image and the infrared image displayed on the monitor 34, the operator or the like determines (diagnoses) the degree of deterioration of the surface 112 of the structure 110 and the degree of deterioration of the coating layer 120. May be good. Even when the inspection device 30 executes steps S5 and S6, the operator or the like may finally determine the degree of deterioration of the surface 112 and the coating layer 120.

[Monitoring program]
Each functional module of the inspection device 30 is realized by reading a monitoring program on the processor 42 or the memory 44 and causing the processor 42 to execute the program. The monitoring program includes a code for realizing each functional module of the inspection device 30. The processor 42 operates the input / output port 48 according to the monitoring program, and executes reading and writing of data in the memory 44 or the storage 46. By such processing, each functional module of the inspection device 30 is realized.

The monitoring program may be provided after being fixedly recorded on a non-temporary recording medium such as a CD-ROM, a DVD-ROM, and a semiconductor memory. Alternatively, the monitoring program may be provided via a communication network as a data signal superimposed on a carrier wave.

[Modification example]
The layer constituting the coating layer 120 is not limited to the above example. FIG. 5 shows another example of a cross section of the concrete structure 100. The first functional layer 130A, the deterioration diagnosis layer 140, and the second functional layer 130B may be laminated in this order from the surface 112 of the structure 110. The first functional layer 130A and the second functional layer 130B may be formed of the same resin material or may be formed of different resin materials. The functional layer and the deterioration diagnosis layer may be laminated in any order. The coating layer 120 does not have to have the deterioration diagnosis layer 140. In this case, the functional layer 130 may contain an additive that absorbs or reflects invisible light. The coating layer 120 may have a layer other than the functional layer and the deterioration diagnosis layer. The layer may be provided between the functional layer and the deterioration diagnosis layer arranged along the direction orthogonal to the surface 112.

In the above example, the deterioration diagnosis layer 140 contains an additive that absorbs infrared rays, but may contain an additive that reflects (for example, scatters) infrared rays. In the above example, an infrared camera is used as the camera 22, but infrared thermography may be used as the camera 22 when the coating layer 120 contains an additive that absorbs or reflects infrared rays. In this case, the camera 22 may generate image data showing the temperature distribution of the region obtained by imaging the monitoring region SA. The second deterioration determination unit 66 may diagnose the degree of deterioration of the coating layer 120 based on the image data showing the temperature distribution of the monitoring region SA.

The second state detection unit 20 may have the same digital camera as the camera 12 for visible light instead of the infrared camera. The digital camera may be configured so that the monitoring region SA can be imaged based on infrared rays by using a filter that blocks visible light and transmits infrared rays. The first state detection unit 10 and the second state detection unit 20 may be mounted on a moving body such as a self-propelled device or a drone. In this case, the inspection device 30 controls the self-propelled device or the moving body, so that the first state detection unit 10 and the second state detection unit 20 are arranged at positions where information can be acquired from the monitoring area SA. You may.

The surveillance system 1 may include one camera capable of generating both a visible light image and an infrared image. In this case, the one camera may function as a first state detection unit and a second state detection unit.

The deterioration diagnosis layer 140 may contain an additive that absorbs or reflects (for example, scatters) ultraviolet rays as invisible light. The wavelength of ultraviolet rays is, for example, 100 nm to 380 nm. Examples of the additive (ultraviolet absorber) that absorbs ultraviolet rays include triazine-based, benzotriazole-based, benzophenone-based, salicylate-based, malonic acid ester-based, and oxalic acid anilide-based compounds. One kind of compound consisting of a group of these monomers may be used, or two or more kinds of compounds may be used in combination.

An example of a triazine-based compound is 2-(4-[(2-hydroxy-3-dodecyloxypropyl) oxy] -2-hydroxyphenyl) -4,6-bis (2,4-dimethylphenyl) -1. , 3,5-Triazine, 2- (4-[(2-Hydroxy-3-tridecyloxypropyl) oxy] -2-hydroxyphenyl) -4,6-bis (2,4-dimethylphenyl) -1,3 , 5-Triazine, 2- [4- (octyl-2-methylethanoate) oxy-2-hydroxyphenyl] -4,6- [bis (2,4-dimethylphenyl)]-1,3,5-triazine , 2,4-Bis (2,4-dimethylphenyl) -6- (2-hydroxy-4-n-octyloxyphenyl) -1,3,5-triazine, 2- (2,4-dihydroxyphenyl)- 4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, N, N', N''-tri (m-tolyl) -1,3,5-triazine-2,4 6-triamine, 2,4,6-tris (4-butoxy-2-hydroxyphenyl) -1,3,5-triazine, 2- (2-hydroxy-4-methoxyphenyl) -4,6-diphenyl-1 , 3,5-Triazine and the like.

Examples of benzotriazole-based compounds include 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-butylphenyl) benzotriazole, 2- [2. '-Hydroxy-5'-[2'-(methacryloyloxy) ethyl] phenyl] -2H-benzotriazole, 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chloro Benzotriazole, 2- (2'-hydroxy-3'-isobutyl-5'-propylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3', 5'-di-t-butylphenyl) Examples thereof include -5-chlorobenzotriazole, 2- (2'-hydroxy-3'-t-butyl-5'-(2- (octyloxycarbonyl) ethyl) phenyl) -5-chlorobenzotriazole and the like.

Examples of benzophenone compounds include 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-4,4'-tetrahydroxy. Examples thereof include benzophenone, 2-hydroxy-4-octyloxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 4-methacryloxy-2-hydroxybenzophenone and the like. ..

Examples of salicylate-based compounds include phenyl salicylate, 4-t-butylphenyl salicylate, 4-octylphenyl salicylate and the like.

Examples of malonic acid ester compounds include dimethyl 2- (4-methoxybenzylidene) malonate, tetraethyl-2,2- (1,4-phenylenedimethylidene) bismalonate and the like.

Examples of oxalic acid anilide compounds include 2-methyl-2'-ethoxyoxalic acid anilide, 2-ethyl-2'-ethoxyoxalic acid anilide, 4,4'-dioctyloxyoxalic acid anilide, 2,2'. -Anilides diethoxyoxalate and the like can be mentioned.

Examples of the additive that reflects ultraviolet rays (ultraviolet ray reflecting agent) include fine particles of a metal oxide containing zinc oxide, titanium oxide, cerium oxide, aluminum oxide, or the like as a main component.

When the coating layer 120 contains an additive that absorbs or reflects ultraviolet rays, an ultraviolet camera may be used as the camera 22 of the second state detection unit 20. In this case, the camera 22 generates image data of ultraviolet rays (hereinafter referred to as "ultraviolet image") by forming an image of ultraviolet rays emitted from the outer surface 102 of the concrete structure 100. Since the coating layer 120 contains an additive that absorbs or reflects ultraviolet rays, ultraviolet rays having an intensity corresponding to the state of the coating layer 120 (residual amount of the coating layer 120) are emitted from the concrete structure 100. Therefore, the ultraviolet image generated by the camera 22 contains information indicating the state of the coating layer 120. The second deterioration determination unit 66 of the inspection device 30 may determine the degree of deterioration of the coating layer 120 based on the ultraviolet image, as in the case based on the infrared image.

The method for determining deterioration by the first deterioration determination unit 64 and the second deterioration determination unit 66 of the inspection device 30 is not limited to the above example. The first deterioration determination unit 64 determines the degree of deterioration of the structure 110 for one monitoring area SA based on the first state information of each of the plurality of monitoring areas SA set in the same concrete structure 100. May be good. More specifically, when determining the degree of deterioration of the structure 110 in the monitoring area SA, the first deterioration determination unit 64 is located in the vicinity of the first state information about the monitoring area SA and the monitoring area SA. The degree of deterioration of the structure 110 may be determined based on the information indicating the state of the structure 110 in the region (another monitoring region SA). For example, the first deterioration determination unit 64 determines the degree of deterioration of the structure 110 based on the comparison result of two visible light images for the monitoring areas SA set adjacent to each other in one concrete structure 100. You may judge. The first deterioration determination unit 64 includes first state information for each of the plurality of monitoring area SAs, and first state information for each of the plurality of monitoring area SAs acquired before the date and time when the information was obtained. The degree of deterioration of the structure 110 may be determined for each monitoring area SA based on the above.

The second deterioration determination unit 66 determines the degree of deterioration of the coating layer 120 for one monitoring area SA based on the second state information of each of the plurality of monitoring areas SA set in the same concrete structure 100. May be good. More specifically, the second deterioration determination unit 66 is located in the vicinity of the second state information about the monitoring area SA and the monitoring area SA when determining the degree of deterioration of the coating layer 120 in the monitoring area SA. The degree of deterioration of the coating layer 120 may be determined based on the information indicating the state of the coating layer 120 in the region (another monitoring region SA). For example, the second deterioration determination unit 66 of the coating layer 120 is based on the comparison result of two infrared images or two ultraviolet images about the monitoring regions SA set adjacent to each other in one concrete structure 100. The degree of deterioration may be determined. The second deterioration determination unit 66 includes second state information for each of the plurality of monitoring area SAs, and second state information for each of the plurality of monitoring area SAs acquired before the date and time when the information was obtained. The degree of deterioration of the coating layer 120 may be determined for each monitoring area SA based on the above.

Each of the first deterioration determination unit 64 and the second deterioration determination unit 66 may determine the degree of deterioration of the surface 112 and the coating layer 120 of the structure 110 by various methods including known image processing techniques. Each of the first deterioration determination unit 64 and the second deterioration determination unit 66 has a surface 112 and a coating layer 120 based on a determination model constructed by machine learning so as to output the degree of deterioration in response to the input of image data. You may determine the degree of deterioration of.

In the above example, the monitoring region SA is imaged based on the visible light and the invisible light reflected by the incident of sunlight, and the monitoring system 1 irradiates the visible light and the invisible light, respectively. It may have an irradiation unit. FIG. 5 shows another example of the monitoring system 1, in which the monitoring system 1 has a first irradiation unit 18 capable of irradiating visible light toward the outer surface 102 of the concrete structure 100, and the outer surface 102. It may have a second irradiation unit 28 capable of irradiating invisible light (for example, infrared rays or ultraviolet rays) toward the surface. The wavelength region of invisible light irradiated by the second irradiation unit 28 is set so that absorption or reflection is generated by the additive contained in the coating layer 120. In this configuration, even when the monitoring area SA is located in a dark place (for example, when it is located in the shade or indoors, and at night), the inspection using the monitoring system 1 can be performed. For example, when inspecting the inner wall of a tunnel, the inspection can be performed more reliably by using the first irradiation unit 18 and the second irradiation unit 28.

In the above example, one computer device (main body 32) executes a predetermined process for monitoring the monitoring area SA, but even if two or more computer devices execute the series of processes. good. For example, as shown in FIG. 5, the monitoring system 1 may include a first inspection device 30A and a second inspection device 30B instead of the inspection device 30. The first inspection device 30A has a main body 32A and a communication device 38A. The second inspection device 30B includes a main body 32B, a monitor 34, an input device 36, and a communication device 38B. The communication device 38A of the first inspection device 30A communicates with the communication device 38B of the second inspection device 30B via a wired, wireless, or network line.

A part of the plurality of functional modules illustrated in FIG. 3 may be provided in the first inspection device 30A, and the remaining part may be provided in the second inspection device 30B. For example, the first inspection device 30A may acquire the first state information and the second state information, and the second inspection device 30B may determine the degree of deterioration of the structure 110 and the coating layer 120. In one example, the main body 32A of the first inspection device 30A has a first detection control unit 54, a second detection control unit 56, and an output unit that outputs image data to the second inspection device 30B as functional modules. You may. The main body 32B of the second inspection device 30B has an input information acquisition unit 52, a storage unit 62, a first deterioration determination unit 64, a second deterioration determination unit 66, an output unit 68, and a first inspection as functional modules. It may have a data acquisition unit that acquires image data from the device 30A.

After the main body 32A of the first inspection device 30A temporarily stores the state information, the state information may be input to the main body 32B of the second inspection device 30B. For example, the main body 32A of the first inspection device 30A may have a storage unit that stores state information together with position information, instead of the output unit. In this case, after various state information stored in the storage unit is input to the main body 32B of the second inspection device 30B, the second inspection device 30B may determine the deterioration of the structure 110 or the like. When the first state detection unit 10 and the second state detection unit 20 are mounted on a self-propelled device or a moving body such as a drone, the first inspection device 30A performs a self-propelled device or a moving body such as a drone. The acquisition of the first state information and the second state information may be continuously performed while controlling.

[Effect of embodiment]
The monitoring method according to the above embodiment is a monitoring method for a concrete structure 100 having a structure 110 including concrete and a coating layer 120 provided on the surface 112 of the structure 110 and capable of transmitting visible light. In this monitoring method, the structure 110 in the monitoring area SA set on the outer surface 102 of the concrete structure 100 is based on the visible light emitted through the coating layer 120 after reflecting the surface 112 of the structure 110. A second step of acquiring state information indicating a state and a second step of indicating the state of the coating layer 120 in the monitoring region SA based on invisible light emitted from the outer surface 102 of the concrete structure 100 and different from visible light. Includes the process of acquiring state information. The coating layer 120 contains an additive that absorbs or reflects invisible light.

In this monitoring method, since the coating layer 120 is formed so as to be able to transmit visible light, the first state information indicating the state of the structure 110 covered by the coating layer 120 is acquired based on the visible light. Further, since the coating layer 120 contains an additive that absorbs or reflects invisible light different from visible light, the second state information indicating the state of the coating layer 120 is acquired based on the invisible light. Therefore, in the monitoring area SA, the structure 110 can be inspected by using the first state information, and the coating layer 120 can be inspected by using the second state information.

As a method of inspecting a concrete structure, a method of inspecting only a structure containing concrete and a method of inspecting only a coating layer (coating film) can be considered. However, in such a method, if deterioration occurs in either the structure or the coating layer, the deterioration may be overlooked. In addition, it may not be possible to determine an appropriate repair time even if either the structure or the coating layer is inspected. Therefore, it is useful to inspect both the structure and the coating layer. In this monitoring method, the inspection of the structure 110 and the inspection of the coating layer 120 can be performed in parallel for one monitoring area SA, so that the efficiency of the inspection of the concrete structure 100 can be improved. Further, since both the structure 110 and the coating layer 120 can be inspected, it is possible to improve the inspection accuracy of the concrete structure 100.

The monitoring method according to the above embodiment includes a step of determining the degree of deterioration of the structure 110 in the monitoring area SA based on the first state information, and a step of determining the degree of deterioration of the structure 110 in the monitoring area SA, and the coating layer 120 in the monitoring area SA based on the second state information. Further includes a step of determining the degree of deterioration. In this case, since the concrete structure 100 can be inspected by using the respective determination results of the degree of deterioration of the structure 110 and the coating layer 120 based on the first state information and the second state information, the concrete structure can be inspected. It is possible to further improve the inspection accuracy of 100.

In the above embodiment, in the step of determining the degree of deterioration of the structure 110, the first state information and the state of the structure 110 in the monitoring area SA acquired before the date and time when the first state information is acquired are obtained. Based on the information shown, the degree of deterioration of the structure 110 is determined. In this case, by comparing the first state information with the corresponding previously acquired information, it is possible to more reliably determine the deterioration of the structure 110 due to aging. As a result, it is possible to further improve the inspection accuracy of the concrete structure 100.

In the above embodiment, in the step of determining the degree of deterioration of the coating layer 120, the second state information and the state of the coating layer 120 in the monitoring area SA acquired before the date and time when the second state information is acquired are obtained. Based on the information shown, the degree of deterioration of the coating layer 120 is determined. In this case, by comparing the second state information with the corresponding previously acquired information, it is possible to more reliably determine the deterioration of the coating layer 120 due to aging. As a result, it is possible to further improve the inspection accuracy of the concrete structure 100.

In the above embodiment, in the step of determining the degree of deterioration of the structure 110, the structure 110 is based on the first state information and the information indicating the state of the structure 110 in the area located around the monitoring area SA. The degree of deterioration of is determined. In this case, by comparing the first state information with the corresponding information in the area around the monitoring area SA, the deterioration of the structure 110 can be determined more reliably. As a result, it is possible to further improve the inspection accuracy of the concrete structure 100.

In the above embodiment, in the step of determining the degree of deterioration of the coating layer 120, the coating layer 120 is based on the second state information and the information indicating the state of the coating layer 120 in the region located around the monitoring region SA. The degree of deterioration of is determined. In this case, by comparing the second state information with the corresponding information in the area around the monitoring area SA, the deterioration of the coating layer 120 can be determined more reliably. As a result, it is possible to further improve the inspection accuracy of the concrete structure 100.

The monitoring method according to the above embodiment further includes a step of acquiring position information indicating the position of the monitoring area SA, and a step of storing each of the first state information and the second state information in association with the position information. include. In this case, it becomes easy to refer to the state information when inspecting one monitoring area SA based on the stored first state information and the second state information. For example, it is easy to refer to the first state information and the second state information about the monitoring area SA, or to refer to the state information of the monitoring area SA and the state information of the area around the monitoring area SA. It becomes. As a result, it becomes possible to further improve the efficiency of the inspection of the concrete structure 100.

In the above embodiment, the coating layer 120 includes a functional layer 130 and a deterioration diagnosis layer 140 arranged along a direction intersecting the surface 112 of the structure 110. The deterioration diagnosis layer 140 contains an additive. In this case, the inclusion of the additive makes it possible to form the coating layer 120 applicable to this monitoring method without impairing the original function of the coating layer 120.

In the above embodiment, the total light transmittance of the coating layer 120 is 30% or more. If the coating layer is colored, the structure cannot be seen through the coating layer. On the other hand, since the coating layer 120 is transparent, it is easy to observe the surface 112 of the structure 110 through the coating layer 120. As a result, both the structure 110 and the coating layer 120 can be inspected more reliably.

Although some embodiments have been described above, the present disclosure is not limited to the above embodiments. Further, the contents of the description of the above-described embodiments can be applied to each other.

[Reference example]
Hereinafter, the contents of the present disclosure will be described in more detail with reference to reference examples. However, this disclosure is not limited to the following reference examples.

(Reference example 1)
A test piece of a coating layer 120 (coating film) having a functional layer 130 and a deterioration diagnosis layer 140 was prepared. Urethane was used as the resin constituting the functional layer 130 and the deterioration diagnosis layer 140. An infrared absorber in an amount of 14% by mass was added to the deterioration diagnosis layer 140 as an additive with respect to the total amount of the urethane resin constituting the deterioration diagnosis layer 140. OP-1485A white / Toyo color (ITO35-45%) was used as an infrared absorber. The coating layer 120 was formed so that the thickness of the deterioration diagnosis layer 140 was 50 μm.

(Reference Examples 2 to 5)
Similar to Reference Example 1, a test piece of a coating layer 120 having a functional layer 130 and a deterioration diagnosis layer 140 was prepared. In the test piece of Reference Example 2, the coating layer 120 is formed so that the thickness of the deterioration diagnosis layer 140 is 100 μm, and in the test piece of Reference Example 3, the coating layer 140 is coated so that the thickness of the deterioration diagnosis layer 140 is 200 μm. The layer 120 was formed. In the test piece of Reference Example 4, the coating layer 120 is formed so that the thickness of the deterioration diagnosis layer 140 is 300 μm, and in the test piece of Reference Example 5, the coating layer 140 is coated so that the thickness of the deterioration diagnosis layer 140 is 500 μm. The layer 120 was formed.

The total light transmittance was measured for each of the test pieces of Reference Examples 1 to 5, and the transparency (visual visibility of cracks) was evaluated. The measurement results and evaluation results are shown in Table 1.

<Measurement of total light transmittance>
Using NDH4000 manufactured by Nippon Denshoku Industries Co., Ltd., the total light transmittance was measured according to JIS K 7375: 2008 (Plastic-How to determine the total light transmittance and the total light reflectance).

<Transparency (Visibility of cracks)>
Draw black lines of 0.2 mm width, 0.3 mm width, and 0.5 mm width on the slate board using a writing tool, place a coating film consisting of the coating layer 120 on the upper surface, and make it transparent according to the following criteria. Gender was evaluated.
A: When the line with a width of 0.2 mm can be clearly seen visually B: When the line with a width of 0.3 mm can be clearly seen visually C: When a line with a width of 0.5 mm can be visually seen

From the evaluation results shown in Table 1, it was confirmed that when the film thickness of the deterioration diagnosis layer 140 is 300 μm or less, the structure 110 has sufficient transparency to visually recognize cracks on the surface 112 of the structure 110. rice field. Further, it was confirmed that when the total light transmittance of the coating layer 120 is 30% or more, the structure 110 has sufficient transparency to visually recognize cracks on the surface 112 of the structure 110.

(Reference example 6)
A test piece of Reference Example 6 was prepared by applying a coating layer having a functional layer 130 without having a deterioration diagnosis layer 140 on the mortar. FIG. 6A is an image obtained by taking an image of the test piece of Reference Example 6 with an infrared camera while the test piece is placed in the sun.

(Reference example 7)
A test piece of Reference Example 7 was prepared by applying a coating layer 120 having a functional layer 130 and a deterioration diagnosis layer 140 on the mortar. To the deterioration diagnosis layer 140, 25% by mass of the infrared absorber was added to the total amount of the urethane resin constituting the deterioration diagnosis layer 140, and the thickness of the deterioration diagnosis layer 140 was set to 40 μm. FIG. 6B is an image obtained by taking an image of the test piece of Reference Example 7 with an infrared camera while the test piece is placed in the sun.

From the comparison results of the images shown in FIGS. 6 (a) and 6 (b), the image of the test piece of Reference Example 6 having no deterioration diagnosis layer 140 becomes white, and the test of Reference Example 7 having the deterioration diagnosis layer 140 becomes white. You can see that the image of the body turns black. It was confirmed that the state of deterioration of the coating layer 120 can be determined by evaluating the optical characteristics (brightness of the image, etc.).

FIG. 7A is an image obtained by photographing the test piece of Reference Example 6 in the shade with a digital camera. FIG. 7B is an image obtained by photographing the test piece of Reference Example 6 in the shade with an infrared camera. FIG. 7C is an image obtained by imaging the test piece of Reference Example 6 in the shade and irradiating the coating layer with infrared rays having a wavelength of 940 nm with an infrared camera. FIG. 7D is an image obtained by photographing the test piece of Reference Example 7 in the shade with a digital camera. FIG. 7E is an image obtained by photographing the test piece of Reference Example 7 in the shade with an infrared camera. FIG. 7 (f) is an image obtained by imaging the test piece of Reference Example 7 in the shade and irradiating the coating layer with infrared rays having a wavelength of 940 nm with an infrared camera.

From the images shown in FIGS. 7 (a) and 7 (d), it can be seen that the state of the surface of the mortar can be determined in any of the test pieces. From the images shown in FIGS. 7 (b) and 7 (e), when the coating layer of the test body is not irradiated with infrared rays in the shade, the image of the test body becomes black regardless of the presence or absence of the deterioration diagnosis layer 140. You can see that. From the images shown in FIGS. 7 (c) and 7 (f), by irradiating the coating layer of the test body with infrared rays, the image of the irradiated portion of the test body becomes white when the deterioration diagnosis layer 140 is not provided. Therefore, when the deterioration diagnosis layer 140 is provided, it can be seen that the irradiation portion of the test piece remains black and the change in color before and after irradiation is small. As described above, it was confirmed that the state of deterioration can be determined by evaluating the optical characteristics (brightness of the image, etc.) of the coating layer.

(Reference example 8)
A test piece of a coating layer 120 (coating film) having a functional layer 130 and a deterioration diagnosis layer 140 was prepared. Urethane was used as the resin constituting the functional layer 130 and the deterioration diagnosis layer 140. To the deterioration diagnosis layer 140, 5% by mass of an ultraviolet absorber was added as an additive to the total amount of the urethane resin constituting the deterioration diagnosis layer 140. As an ultraviolet absorber, Tinuvin400 / BASF Japan (2- (4-[(2-hydroxy-3-dodecyloxypropyl) oxy] -2-hydroxyphenyl) -4,6-bis (2,4-dimethylphenyl)- 1,3,5-triazine and 2-(4-[(2-hydroxy-3-tridecyloxypropyl) oxy] -2-hydroxyphenyl) -4,6-bis (2,4-dimethylphenyl) -1 , 3,5-Triazine and 1-methoxy-2-propanol). The coating layer 120 was formed so that the thickness of the deterioration diagnosis layer 140 was 100 μm.

(Reference Examples 9 and 10)
Similar to Reference Example 8, a test piece of the coating layer 120 having the functional layer 130 and the deterioration diagnosis layer 140 was prepared. In the test piece of Reference Example 9, the coating layer 120 is formed so that the thickness of the deterioration diagnosis layer 140 is 200 μm, and in the test piece of Reference Example 10, the coating layer 140 is coated so that the thickness of the deterioration diagnosis layer 140 is 500 μm. The layer 120 was formed.

For each of the test pieces of Reference Examples 8 to 10, the total light transmittance was measured to evaluate the transparency (visibleness of cracks). The measurement results and evaluation results are shown in Table 2. From the evaluation results shown in Table 2, it was confirmed that the deterioration diagnosis layer 140 to which the ultraviolet absorber was added had transparency so that the surface of the structure could be seen even when the film thickness was 500 μm.

(Reference example 11)
A test piece of Reference Example 11 was prepared by applying a functional layer 130 having a thickness of 1 mm on the mortar without containing an ultraviolet absorber.

(Reference example 12)
A test piece of Reference Example 12 was prepared by applying a functional layer 130 having a thickness of 1 mm to which 0.5% by mass of the above ultraviolet absorber was added on the mortar.

FIG. 8A is an image obtained by photographing the test piece of Reference Example 11 in a bright place with a digital camera. FIG. 8B is an image obtained by photographing the test piece of Reference Example 11 with an ultraviolet camera in a dark place without irradiating the functional layer 130 with ultraviolet rays. When the brightness was measured when this image was obtained, the measured value was 17 cd / m ² . FIG. 8C is an image obtained by photographing the test piece of Reference Example 11 with an ultraviolet camera while the functional layer 130 is irradiated with ultraviolet rays. When this image was obtained, the brightness of the portion irradiated with ultraviolet rays was measured, and the measured value was 122 cd / m ² .

FIG. 8D is an image obtained by photographing the test piece of Reference Example 12 in a bright place with a digital camera. FIG. 8E is an image obtained by photographing the test piece of Reference Example 12 with an ultraviolet camera in a dark place without irradiating the functional layer 130 with ultraviolet rays. When the brightness was measured when this image was obtained, the measured value was 18 cd / m ² . FIG. 8 (f) is an image obtained by photographing the test piece of Reference Example 12 with an ultraviolet camera while the functional layer 130 is irradiated with ultraviolet rays. When this image was obtained, the brightness of the portion irradiated with ultraviolet rays was measured, and the measured value was 42 cd / m ² .

From the above evaluation results, it can be seen that when an image is taken in a dark place using an ultraviolet camera, the image of the test piece becomes black regardless of the presence or absence of the ultraviolet absorber. In addition, by irradiating with ultraviolet rays, the image of the test piece is bright when it does not have an ultraviolet absorber, and the brightness difference before and after irradiation is large, but when it has an ultraviolet absorber, the image of the test piece remains dark. It can be seen that the difference in brightness between the front and back is small. It was confirmed that the state of deterioration can be determined by the optical characteristics of the coating layer (for example, the brightness of the image, etc.).

According to the present disclosure, a monitoring method, a monitoring system, and a monitoring program capable of improving the inspection accuracy while improving the efficiency of inspection of a concrete structure are provided.

1 ... Monitoring system, 10 ... 1st state detection unit, 20 ... 2nd state detection unit, 100 ... concrete structure, 102 ... outer surface, 110 ... structure, 112 ... surface, 120 ... coating layer, 130 ... functional layer , 140 ... Deterioration diagnosis layer.

Claims (11)

A method for monitoring a concrete structure having a structure containing concrete and a coating layer provided on the surface of the structure and capable of transmitting visible light.
First state information indicating the state of the structure in a monitoring area set on the outer surface of the concrete structure based on the visible light emitted through the coating layer after reflecting the surface of the structure. And the process of getting
A step of acquiring a second state information indicating the state of the coating layer in the monitoring region based on invisible light emitted from the outer surface of the concrete structure and different from the visible light is included.
A monitoring method, wherein the coating layer contains an additive that absorbs or reflects the invisible light. A step of determining the degree of deterioration of the structure in the monitoring area based on the first state information, and a step of determining the degree of deterioration of the structure.
The monitoring method according to claim 1, further comprising a step of determining the degree of deterioration of the coating layer in the monitoring region based on the second state information. In the step of determining the degree of deterioration of the structure, the first state information and the information indicating the state of the structure in the monitoring area acquired before the date and time when the first state information was acquired are used. The monitoring method according to claim 2, wherein the degree of deterioration of the structure is determined based on the above. In the step of determining the degree of deterioration of the coating layer, the second state information and the information indicating the state of the coating layer in the monitoring area acquired before the date and time when the second state information was acquired are used. The monitoring method according to claim 2 or 3, wherein the degree of deterioration of the coating layer is determined based on the above. In the step of determining the degree of deterioration of the structure, the degree of deterioration of the structure is based on the first state information and the information indicating the state of the structure in the region located around the monitoring area. The monitoring method according to any one of claims 2 to 4, wherein the method is determined. In the step of determining the degree of deterioration of the coating layer, the degree of deterioration of the coating layer is based on the second state information and the information indicating the state of the coating layer in the region located around the monitoring region. The monitoring method according to any one of claims 2 to 5, wherein the method is determined. The process of acquiring the position information indicating the position of the monitoring area and
The monitoring method according to any one of claims 1 to 6, further comprising a step of associating and storing each of the first state information and the second state information with the position information. The coating layer includes a functional layer and a deterioration diagnosis layer arranged along a direction intersecting the surface of the structure.
The monitoring method according to any one of claims 1 to 7, wherein the deterioration diagnosis layer contains the additive. The monitoring method according to any one of claims 1 to 8, wherein the total light transmittance of the coating layer is 30% or more. A monitoring system for a concrete structure comprising a structure containing concrete and a coating layer provided on the surface of the structure and capable of transmitting visible light.
A first state for detecting the state of the structure in a monitoring area set on the outer surface of the concrete structure based on the visible light emitted through the coating layer after reflecting the surface of the structure. With the detector
A second state detection unit for detecting the state of the coating layer in the monitoring region based on invisible light emitted from the outer surface of the concrete structure and different from the visible light is provided.
A monitoring system in which the coating layer contains an additive that absorbs or reflects the invisible light. A monitoring program that causes a computer to execute a monitoring method for a concrete structure having a structure containing concrete and a coating layer provided on the surface of the structure and capable of transmitting visible light.
The monitoring method is
First state information indicating the state of the structure in a monitoring area set on the outer surface of the concrete structure based on the visible light emitted through the coating layer after reflecting the surface of the structure. And the process of getting
A step of acquiring a second state information indicating the state of the coating layer in the monitoring region based on invisible light emitted from the outer surface of the concrete structure and different from the visible light.
A monitoring program in which the coating layer contains an additive that absorbs or reflects the invisible light.

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