Prediction device

Abstract

A prediction device (10) according to the present disclosure comprises: a deteriorated area designation unit (11) that designates, in each of a plurality of rebars (2), a deteriorated area where the rebar (2) has deteriorated, on the basis of the location of a deteriorated portion where the deterioration in the rebar structure has become obvious and the arrangement of the plurality of rebars; an analogous area designation unit (12) that designates, as an analogous area where deterioration of the rebar 2 is inferred by analogy, a rectangular area of which the length of one side is the length of a deteriorated area in a prescribed direction and the length of the other side is the distance to a prescribed rebar 2 beside the rebar 2 that includes said deteriorated area; and an extended deteriorated area designation unit (13) that, when another deteriorated area is included in the analogous area designated in correspondence with a deteriorated area, designates the rebar (2) included in the analogous area as an extended deteriorated area where the deterioration has not become obvious.

Description

Prediction Device

[0001] The present disclosure relates to a prediction device.

[0002] The state in which corrosion progresses due to exposure of reinforcing bars to the outside air caused by cracks or spalling of concrete in reinforced concrete structures (RC structures) is generally considered to be the lifespan (service limit) of the RC structure (see Non-Patent Documents 1-3). Therefore, once the reinforcing bars are exposed (hereinafter referred to as "exposed reinforcing bars"), the RC structure is considered to have reached its service limit, and immediate repairs or replacements are carried out.

[0003] In addition to the aging of infrastructure structures, it is predicted that the number of personnel responsible for maintaining infrastructure structures will decrease in the future. This will require further efficiency in infrastructure maintenance and management, and it is predicted that infrastructure structures will need to be operated to their full capacity.

[0004] As mentioned above, conventionally, RC structures after reinforcement exposure have been considered to be at the limit of their service life, and their behavior has not been fully understood (see Non-Patent Document 4). Therefore, no method has been established to predict the deterioration of structures after reinforcement exposure.

[0005] RC structures with cracks or exposed reinforcement are repaired by repairing cross sections, etc. However, it is not clear to what extent cracks or exposed reinforcement should be repaired when cracks or exposed reinforcement occur in only a portion of an RC structure. Furthermore, when cracks or exposed reinforcement occur due to corrosion of reinforcing steel in concrete caused by salt damage or carbonation, corrosion may be progressing over a large area inside the concrete, and the cracks or exposed reinforcement may only be apparent in a small area.

[0006] Therefore, it is important to understand the extent of corrosion of rebar in areas of undeteriorated concrete near cracked or exposed reinforcement, where concrete deterioration is not apparent, but there are no fully established methods for doing so. Therefore, the general method is to determine the extent of corrosion by visually checking the extent of corrosion along the line of the rebar from the exposed reinforcement during the process of chipping the concrete at the repair site, and then determine the extent of repair.

[0007] There are electrochemical methods for measuring the corrosion state of unexposed rebars. Typically, the potential measurement method conforming to ASTM (American Society for Testing and Materials) C876 (see Non-Patent Documents 5 and 6) is applied. This method involves exposing the unexposed rebars and measuring the potential difference between the exposed rebars and a reference electrode installed on the concrete surface to obtain a potential map of the surface under investigation. The corrosion area is then estimated from the obtained potential map. However, this method requires exposing the unexposed rebars to connect the electrodes, and it is not a definitive diagnosis. Therefore, visual inspection by chipping out the rebars tends to be preferred over potential measurement methods. Furthermore, electrochemical measurement is difficult when cavities exist within the concrete due to jump forces or corrosion expansion of the rebars.

[0008] To predict the future structural strength of a structure, it is necessary to estimate the strength by finite element analysis under conditions that reflect the future deterioration state (see Non-Patent Document 7).

[0009] Kakizaki, Masayoshi, "Life Prediction of Reinforced Concrete Buildings," Safety Engineering, Vol. 31, No. 6, pp. 421-431 (1991). Araki, Kosuke et al., "Spalling of Cover Concrete Due to Corrosion and Expansion of Steel Bars and Its Prediction," Transactions of the Japan Society of Civil Engineers, No. 802, pp. 209-222 (2005). Iyoda, Takeshi et al., "Development of a System for Predicting the Progress of Deterioration of Concrete Structures by Cause," Production Research, Vol. 51, No. 11, pp. 777-780 (1999). Tsuchiya, Naoko et al., "Study on the Manifestation Process of Cracking, Lifting, and Separation Caused by Corrosion of Steel Bars on the Surface of RC Walls with Mortar Finishes," Journal of Structural Engineering and Construction Engineering, Architectural Institute of Japan, Vol. 87, No. 799, pp. 854-865 (2022). Toyoaki Miyagawa, "Measurement of Electric Potential in Concrete Structures," Boshoku Gijutsu, Vol. 36, No. 7, pp. 465-467 (1987). Y. Kawasaki et al., "Phenomenological Process of Rebar Corrosion in Reinforced Concrete Evaluated by Acoustic Emission and Electrochemical Noise," Construction and Building Materials, Vol. 352, Article 128829 (2022). Narihiko Saito et al., "Effect of Rebar Corrosion Distribution on the Flexural Load-Carrying Properties of RC Beams," Journal of the Japan Society of Civil Engineers, Proceedings of the Society of Civil Engineers, Vol. 64, No. 4, pp. 601-611 (2008).

[0010] As mentioned above, it is not clear how the exposed reinforcement expands in reinforced concrete structures after the reinforcement is exposed. In the exposed reinforcement, corrosion of the rebar near the boundary between the exposed and unexposed reinforcement progresses concrete spalling. Furthermore, the larger the extent of corrosion of the rebar in the unexposed reinforcement, the more significant the expansion of the exposed reinforcement.

[0011] It is desirable to repair not only exposed reinforcement but also unexposed reinforcement, but because the extent of rebar corrosion near the exposed reinforcement is unknown until the reinforcement is removed, it is difficult to estimate and determine the extent of repair in advance. Therefore, even if repairs are carried out, if the unexposed reinforcement is not repaired sufficiently, there is a risk that further repairs will be required in a short period of time.

[0012] Therefore, there is a need for technology that can predict the deterioration of unexposed rebar from the obvious deterioration in reinforced concrete structures, such as cracks or exposed rebar.

[0013] The purpose of the present disclosure, made in consideration of the above-mentioned problems, is to provide a prediction device that can predict deterioration of reinforcing bars in unexposed reinforcement bars from apparent deterioration in reinforced concrete structures.

[0014] In order to solve the above problem, the prediction device disclosed herein is a prediction device that predicts the progression of deterioration of a reinforced concrete structure that includes multiple reinforcing bars extending in a predetermined direction, and is equipped with: a first designation unit that designates a deterioration area in each of the multiple reinforcing bars where the reinforcing bars have deteriorated based on the position of the deteriorated part in the reinforced concrete structure where deterioration is apparent and the arrangement of the multiple reinforcing bars; a second designation unit that designates a rectangular area where deterioration of the reinforcing bars is inferred, with one side being the length of the deterioration area in the predetermined direction and the other side being the distance to a predetermined reinforcing bar that is aligned with the reinforcing bar that includes the deterioration area; and a third designation unit that, if the analogy area designated corresponding to the deterioration area includes other deterioration areas, designates the reinforcing bars included in the analogy area as an extended deterioration area where deterioration is not apparent.

[0015] According to the prediction device of the present disclosure, deterioration of reinforcing bars in unexposed reinforcement bars can be predicted from the apparent deterioration in a reinforced concrete structure.

[0016] 5B is a diagram showing an example of an analogy region designated by the analogy region designation unit shown in FIG. 1 for the analogy region shown in FIG. 5A . FIG. 6A is a diagram showing an example of an extended deteriorated region and an isolated deteriorated region designated by the extended deteriorated region designation unit shown in FIG. 1 for the analogy region shown in FIG. 6A . FIG. 6B is a diagram showing an example of an extended deteriorated region and an isolated deteriorated region designated by the extended deteriorated region designation unit shown in FIG. 1 for the analogy region shown in FIG. 6A . FIG. 6C is a diagram showing an example of an extended deteriorated region and an isolated deteriorated region designated by the extended deteriorated region designation unit shown in FIG. 1 for the analogy region shown in FIG. 6A . FIG. 6D is a diagram showing an example of an extended deteriorated region and an isolated deteriorated region designated by the extended deteriorated region designation unit shown in FIG. 1 for the analogy region shown in FIG. 6A . FIG. 6E is a diagram showing an example of an extended deteriorated region and an isolated deteriorated region designated by the extended deteriorated region designation unit shown in FIG. 1 for the analogy region shown in FIG. 6A . FIG. 6F is a diagram showing an example of an extended deteriorated region and an isolated deteriorated region designated by the analogy region designation unit shown in FIG. 1 for the analogy region shown in FIG. 6A . FIG. 6G is a diagram showing an example of an extended deteriorated region and an isolated deteriorated region designated by the analogy region designation unit shown in FIG. 1 for the analogy region shown in FIG. 6A . FIG. 6H is a diagram showing an example of an extended deteriorated region and an isolated deteriorated region based on the extended deteriorated region by the analogy region designation unit shown in FIG. 1 . FIG. 6I is a flowchart showing an example of the operation of the prediction device shown in FIG. 1 . FIG. 2 is a diagram illustrating an example of the configuration of a computer that functions as the prediction device illustrated in FIG. 1 .

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0018] FIG. 1 is a diagram illustrating an example configuration of a prediction device 10 according to an embodiment of the present disclosure. The prediction device 10 according to the present disclosure predicts the progress of deterioration of a reinforced concrete structure including a plurality of reinforcing bars extending in a predetermined direction. In this embodiment, the reinforced concrete structure is described as an example of a reinforced concrete structure (RC structure) including a plurality of reinforcing bars extending in a predetermined direction, but the present disclosure is not limited to this. The reinforced concrete structure may also be a structure made of other materials, such as a thermosetting resin, as long as it includes a plurality of reinforcing bars extending in a predetermined direction.

[0019] In the following description, the reinforced concrete structure is a manhole 1 buried underground as shown in FIG. 2A, and the progress of deterioration in the ceiling portion (slab) 1A of the manhole 1 is predicted. FIG. 2B is a diagram showing the state of looking up at the ceiling portion 1A from inside the manhole 1. As shown in FIG. 2B, a plurality of reinforcing bars 2A to 2E extending in a predetermined direction (x direction) are arranged side by side in the y direction in the ceiling portion 1A. In the following description, when there is no need to distinguish between the reinforcing bars 2A to 2E, they will be referred to as reinforcing bars 2. Although the reinforcing bars 2 cannot be seen because they are buried inside the concrete, the following description also illustrates the reinforcing bars 2 for ease of explanation.

[0020] As shown in Figure 1, the prediction device 10 of this embodiment includes a degradation area designation unit 11 as a first designation unit, an analogy area designation unit 12 as a second designation unit, an extended degradation area designation unit 13 as a third designation unit, and a repair range output unit 14 as an output unit.

[0021] The deterioration area designation unit 11 receives deterioration information and placement information. The deterioration information is information regarding the location of apparent deterioration in the reinforced concrete structure, such as cracks or exposed reinforcement. The deterioration area designation unit 11 receives, as deterioration information, for example, a photographed image of the ceiling portion 1A of a manhole 1, as shown in FIG. 3A , showing apparent deterioration such as cracks or exposed reinforcement. Deterioration of the reinforced concrete structure includes exposed reinforcement of several centimeters to several tens of centimeters, leakage of rust fluid, minute areas of exposed reinforcement where aggregate has fallen out, and surface-wide concrete lift or cracks. The placement information is information regarding the placement of the rebars 2 that constitute the reinforced concrete structure. The placement information can be obtained, for example, from a design drawing of the reinforced concrete structure. The placement information can also be obtained, for example, by rebar detection using electromagnetic waves.

[0022] The deterioration area designation unit 11 designates the position of a deteriorated portion in a reinforced concrete structure where deterioration has become apparent, based on the input deterioration information and placement information. In an actual reinforced concrete structure, deterioration such as cracks or exposed reinforcing bars may occur in a position that is different from the position where the reinforcing bars 2 are placed. This deviation is thought to be caused by the progression of cracks in the concrete. Furthermore, deterioration such as cracks or exposed reinforcing bars occurs due to corrosion of the reinforcing bars 2. Therefore, it is thought that the reinforcing bars 2 closest to the apparent deterioration have deteriorated due to corrosion. As shown in FIG. 3B , the deterioration area designation unit 11 designates a rectangular area along the extension direction (x direction) of the reinforcing bars 2, including the apparent deterioration, as the deteriorated portion.

[0023] The degradation area designation unit 11 designates a degradation area in each of the multiple reinforcing bars 2 where the reinforcing bars 2 have deteriorated, based on the designated deteriorated portion. Specifically, as shown in Fig. 4, the degradation area designation unit 11 designates an area of ​​the reinforcing bars 2 that overlaps with the deteriorated portion as the deteriorated area. In the example shown in Fig. 4, the degradation area designation unit 11 designates an area of ​​the reinforcing bars 2A, 2C, and 2D that overlap with the deteriorated portion as the deteriorated area. Furthermore, if the deteriorated portion does not overlap with the reinforcing bar 2, the degradation area designation unit 11 designates an area of ​​the reinforcing bars 2 nearest to the deteriorated portion, whose position in the extension direction (x direction) of the reinforcing bar 2 coincides with the position of the deteriorated portion, as the deteriorated area.

[0024] In this way, the deterioration area designation unit 11 designates the deterioration area in each of the multiple reinforcing bars 2 where the reinforcing bars 2 have deteriorated, based on the position of the deteriorated part in the reinforced concrete structure (RC structure) where deterioration has become apparent and the arrangement of the multiple reinforcing bars 2.

[0025] Referring back to FIG. 1, the degraded region designation unit 11 outputs the result of designating the degraded region to the analogous region designation unit 12 .

[0026] The analogy area designation unit 12 designates an analogy area in which deterioration of the reinforcing bar 2 is inferred from the deterioration area designated by the deterioration area designation unit 11. Fig. 5A is a diagram showing an example of a deterioration area in the ceiling portion 1A of the manhole 1, and Fig. 5B is a diagram showing another example of a deterioration area in the ceiling portion 1A of the manhole 1.

[0027] Fig. 6A is a diagram showing an analogous region designated by the analogous region designation unit 12 for the degraded region shown in Fig. 5A. Fig. 6B is a diagram showing an analogous region designated by the analogous region designation unit 12 for the degraded region shown in Fig. 5B.

[0028] There is a high possibility that the reinforcing bars 2 in the vicinity of the deteriorated area are deteriorated in the same manner as the deteriorated area. Therefore, as shown in FIGS. 6A and 6B , the analogy area designation unit 12 designates a rectangular area as an analogy area, where the length of one side is the length of the deteriorated area in a predetermined direction (x direction) and the length of the other side is the distance to a predetermined reinforcing bar 2 aligned with the reinforcing bar 2 including the deteriorated area. The examples in FIGS. 6A and 6B illustrate an example of designating a rectangular area as an analogy area, where the length of one side is the length of the deteriorated area in a predetermined direction and the length of the other side is the distance to an adjacent reinforcing bar 2 from the reinforcing bar 2 including the deteriorated area. Note that no reinforcing bars 2 are present in the opening in the ceiling 1A. Therefore, if an opening exists in a rectangular area where the length of one side is the length of the deteriorated area in the predetermined direction (x direction) and the length of the other side is the distance to a predetermined reinforcing bar 2 aligned with the reinforcing bar 2 including the deteriorated area, the analogy area designation unit 12 does not designate the area as an analogy area.

[0029] Referring back to FIG. 1, the analogous region designation unit 12 outputs the result of designating the analogous region to the extended deteriorated region designation unit 13 .

[0030] As shown in FIG. 6A , when an analogous region designated corresponding to a deteriorated region includes another deteriorated region, the expanded deteriorated region designator 13 designates the reinforcing bar 2 included in the analogous region as an expanded deteriorated region. An expanded deteriorated region is a region in the reinforcing bar 2 that is likely to be deteriorated similarly to the deteriorated region designated by the deteriorated region designator 11, but where the deterioration is not apparent. In the example shown in FIG. 6A , for example, the analogous region designated corresponding to the deteriorated region of the reinforcing bar 2C includes the deteriorated region of the reinforcing bar 2D. In this case, as shown in FIG. 7A , the expanded deteriorated region designator 13 designates a region in the reinforcing bar 2D that is included in the analogous region designated corresponding to the deteriorated region of the reinforcing bar 2C as an expanded deteriorated region. Furthermore, the expanded deteriorated region designator 13 designates a region in the reinforcing bar 2C that is included in the analogous region designated corresponding to the deteriorated region of the reinforcing bar 2D, other than the deteriorated region, as an expanded deteriorated region.

[0031] Furthermore, as shown in Figures 7A and 7B, if the analogy area specified corresponding to a deteriorated area does not include any other deteriorated areas, the extended deteriorated area designation unit 13 designates the deteriorated area as an independently deteriorated area. An independently deteriorated area is a deteriorated area in which deterioration does not progress around it. If the analogy area specified corresponding to a deteriorated area does not include any other deteriorated areas, it is considered that the deterioration is not caused by a progressive factor such as corrosion, but by a non-progressive factor such as impact load. Therefore, if the analogy area specified corresponding to a deteriorated area does not include any other deteriorated areas, the extended deteriorated area designation unit 13 designates the deteriorated area as an independently deteriorated area.

[0032] In each of the extended degradation region and the single degradation region, there is a possibility that degradation may progress due to a specific event. Therefore, if the rate of progression of degradation in each of the extended degradation region and the single degradation region is known, the extended degradation region designation unit 13 may expand the extended degradation region and the single degradation region based on the rate of progression.

[0033] Referring back to FIG. 1 , the expanded degradation region designation unit 13 outputs the results of designating the expanded degradation region and the isolated degradation region to the analogy region designation unit 12 until the processes of the analogy region designation unit 12 and the expanded degradation region designation unit 13 are repeated a predetermined number of times. The analogy region designation unit 12 regards the expanded degradation region as a degradation region and performs the above-described process. That is, as shown in FIG. 8 , the analogy region designation unit 12 further designates, as an analogy region, a rectangular region whose one side is the length of the expanded degradation region in a predetermined direction (x direction) and whose other side is the distance to a predetermined reinforcing bar 2 aligned with the reinforcing bar 2 including the expanded degradation region. The more the processes of the analogy region designation unit 12 and the expanded degradation region designation unit 13 are repeated, the more future degradation of the reinforcing bar 2 can be predicted. The number of times the processes of the analogy region designation unit 12 and the expanded degradation region designation unit 13 are repeated is set in advance by, for example, a maintenance manager of the reinforced concrete structure.

[0034] Referring again to Figure 1, when the processing of the analogy area designation unit 12 and the extended degradation area designation unit 13 is repeated a predetermined number of times, the extended degradation area designation unit 13 outputs the results of designating the extended degradation area and the single degradation area to the repair range output unit 14.

[0035] The repair range output unit 14 outputs the repair range of the reinforced concrete structure. Specifically, for a deteriorated area whose corresponding analogical area includes another deteriorated area, the repair range output unit 14 outputs the deteriorated area and the other deteriorated area (i.e., extended deteriorated area) as the repair range. Furthermore, for a deteriorated area whose corresponding analogical area does not include another deteriorated area, the repair range output unit 14 outputs the deteriorated area (i.e., single deteriorated area) as the repair range. The repair range output unit 14 outputs the repair range, for example, by displaying it on a display device.

[0036] Next, the operation of the prediction device 10 according to this embodiment will be described. Fig. 9 is a flowchart showing an example of the operation of the prediction device 10 according to this embodiment, and is a diagram for explaining a prediction method by the prediction device 10 according to this embodiment.

[0037] The degradation area designation unit 11 designates a degradation area in each of the multiple reinforcing bars 2 where the reinforcing bars 2 have deteriorated, based on the position of the deteriorated portion in the reinforced concrete structure where deterioration has become apparent and the arrangement of the multiple reinforcing bars 2 (step S11). Specifically, the degradation area designation unit 11 designates the position of the deteriorated portion in the reinforced concrete structure where deterioration has become apparent, based on the deterioration information. Then, the degradation area designation unit 11 designates a degradation area in each of the multiple reinforcing bars 2 based on the designated deteriorated portion. The degradation area designation unit 11 may designate a region of the reinforcing bar 2 that overlaps with a deteriorated portion as the degradation area. Furthermore, if a deteriorated portion does not overlap with the reinforcing bar 2, the degradation area designation unit 11 may designate a region of the reinforcing bar 2 closest to the deteriorated portion, where the position in the extension direction (x direction) of the reinforcing bar 2 coincides with the position of the deteriorated portion, as the degradation area.

[0038] The analogy area designation unit 12 designates a rectangular area as the analogy area, with one side being the length of the deterioration area in a specified direction (the x-direction in which the reinforcing bar 2 extends) and the other side being the distance to a specified reinforcing bar 2 that is aligned with the reinforcing bar 2 that includes the deterioration area (step S12).

[0039] The expanded deteriorated region designation unit 13 determines whether or not another deteriorated region is included in the analogous region designated in correspondence with one deteriorated region (step S13).

[0040] If it is determined that the analogy area specified corresponding to one degraded area does not include other degraded areas (step S13: No), the extended degraded area designation unit 13 proceeds to processing of step 16 described below.

[0041] If it is determined that the analogy area designated corresponding to one deterioration area includes another deterioration area (step S13: Yes), the extended deterioration area designation unit 13 designates the reinforcing bar 2 included in the analogy area as an extended deterioration area in which deterioration is not apparent (step S14).

[0042] The analogy area designation unit 12 designates an analogy area for the deterioration area and the extended deterioration area (step S15). That is, the analogy area designation unit 12 further designates, as the analogy area, a rectangular area whose one side is the length of the extended deterioration area in a predetermined direction and whose other side is the distance to a predetermined reinforcing bar 2 aligned with the reinforcing bar 2 including the extended deterioration area.

[0043] The extended deteriorated area designation unit 13 determines whether or not there is progress of specific deterioration for each of the extended deteriorated area and the single deteriorated area (step S16).

[0044] When it is determined that there is no specific progression of deterioration in either the extended deteriorated region or the single deteriorated region (step S16: No), the extended deteriorated region designation unit 13 proceeds to the processing of step S18 described later.

[0045] If it is determined that there is a progression of specific deterioration in each of the extended deterioration area and the individual deterioration area (step S16: Yes), the extended deterioration area designation unit 13 reflects the progression of specific deterioration by expanding the extended deterioration area and the individual deterioration area based on the known rate of progression of deterioration in each of the extended deterioration area and the individual deterioration area (step S17).

[0046] Next, the expanded deteriorated region designation unit 13 determines whether the variable n is less than a predetermined number of repetitions (step S18).

[0047] If it is determined that the variable n is less than the predetermined number of repetitions (step S18: Yes), the extended deteriorated region designation unit 13 adds 1 to the variable n (step S19) and returns to the processing of step S13.

[0048] If it is determined that the variable n is not less than the predetermined number of repetitions (the variable n has reached the number of repetitions) (step S18: No), the extended deteriorated area designation unit 13 outputs the results of designating the deteriorated area and the extended deteriorated area to the repair range output unit 14, and ends the processing. The repair range output unit 14 outputs the repair range based on the output of the extended deteriorated area designation unit 13.

[0049] As described above, the prediction device 10 according to this embodiment includes a deteriorated area designation unit 11, an analogous area designation unit 12, and an extended deteriorated area designation unit 13. The deteriorated area designation unit 11 designates a deteriorated area in each of the multiple reinforcing bars 2 based on the position of a deteriorated portion in a reinforced concrete structure where deterioration is apparent and the arrangement of the multiple reinforcing bars 2. The analogous area designation unit 12 designates, as the analogous area, a rectangular area whose one side is the length of the deteriorated area in a predetermined direction and whose other side is the distance to a predetermined reinforcing bar 2 aligned with the reinforcing bar 2 including the deteriorated area. If the analogous area designated corresponding to the deteriorated area includes another deteriorated area, the extended deteriorated area designation unit 13 designates the reinforcing bars 2 included in the analogous area as an extended deteriorated area where deterioration is not apparent.

[0050] When an analogous region is specified for a deteriorated region designated by apparent deterioration, and the analogous region includes other deteriorated regions, there is a high possibility that similar deterioration will occur in the reinforcing bars 2 included in the analogous region. Therefore, when other deteriorated regions are included in the analogous region, by specifying the reinforcing bars 2 included in the analogous region as an extended deteriorated region, it is possible to predict the deterioration of the reinforcing bars in the unexposed reinforcement parts from the apparent deterioration in the reinforced concrete structure.

[0051] The prediction device 10 described above can be realized by a computer 20 shown in FIG. 10 . A program for causing the computer 20 to function as the prediction device 10 may be provided. The program may be stored in a storage medium or provided via a network. FIG. 10 is a block diagram showing a schematic configuration of a computer 20 functioning as the prediction device 10. The computer 20 may be a general-purpose computer, a dedicated computer, a workstation, a PC (Personal Computer), an electronic notepad, or the like. The program instructions may be program code, code segments, or the like for performing necessary tasks.

[0052] 10 , the computer 20 includes a processor 21, a ROM (Read Only Memory) 22, a RAM (Random Access Memory) 23, a storage 24, an input unit 25, a display unit 26, and a communication interface (I / F) 27. Each component is communicably connected to one another via a bus 29. The processor 21 is specifically a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a GPU (Graphics Processing Unit), a DSP (Digital Signal Processor), a SoC (System on a Chip), or the like, and may be configured with multiple processors of the same or different types.

[0053] The processor 21 is a control unit that controls each component and performs various arithmetic processing. That is, the processor 21 reads a program from the ROM 22 or the storage 24 and executes the program using the RAM 23 as a work area. The processor 21 controls each component and performs various arithmetic processing in accordance with the program stored in the ROM 22 or the storage 24. In this embodiment, the ROM 22 or the storage 24 stores a program for causing the computer 20 to operate as the prediction device 10 according to the present disclosure. The program is read and executed by the processor 21 to realize each component of the prediction device 10, such as the degradation area designation unit 11, the analogy area designation unit 12, the extended degradation area designation unit 13, and the repair range output unit 14.

[0054] The program may be provided in a form stored on a non-transitory storage medium such as a CD-ROM (Compact Disk Read Only Memory), a DVD-ROM (Digital Versatile Disk Read Only Memory), a USB (Universal Serial Bus) memory, etc. The program may also be provided in a form downloaded from an external device via a network.

[0055] The ROM 22 stores various programs and various data. The RAM 23 temporarily stores programs or data as a working area. The storage 24 is configured with an HDD (Hard Disk Drive) or an SSD (Solid State Drive) and stores various programs including the operating system and various data.

[0056] The input unit 25 includes a pointing device such as a mouse and a keyboard, and is used to perform various inputs. The input unit 25 receives inputs of, for example, degradation information and placement information.

[0057] The display unit 26 is, for example, a liquid crystal display, and displays various information. The display unit 26 may employ a touch panel system and function as the input unit 25. The display unit 26 displays, for example, the repair area of ​​the reinforced concrete structure.

[0058] The communication interface 27 is an interface for communicating with other devices, for example, an interface for a LAN.

[0059] The following additional notes are provided regarding the above-described embodiments.

[0060] [Supplementary Item 1] A prediction device that predicts the progression of deterioration of a reinforced concrete structure that includes multiple reinforcing bars extending in a predetermined direction, comprising a control unit, wherein the control unit: specifies a deterioration area in each of the multiple reinforcing bars where the reinforcing bars have deteriorated based on the position of a deteriorated portion in the reinforced concrete structure where deterioration has become apparent and the arrangement of the multiple reinforcing bars; specifies a rectangular area where the length of the deterioration area in the predetermined direction is the length of one side and the distance to a predetermined reinforcing bar that is aligned with the reinforcing bar that includes the deterioration area is the length of the other side, as an analogy area where deterioration of the reinforcing bars is inferred; and when the analogy area specified corresponding to the deterioration area includes other deterioration areas, the prediction device designates the reinforcing bars included in the analogy area as an extended deterioration area where deterioration is not apparent.

[0061] [Supplementary Item 2] In the prediction device described in Supplementary Item 1, when no other degraded areas are included in the analogous area designated corresponding to the degraded area, the control unit designates the degraded area as a single degraded area in which degradation does not progress to the surrounding area.

[0062] [Supplementary Item 3] In the prediction device described in Supplementary Item 1 or 2, the control unit further specifies as the analogy area a rectangular area having the length of one side of the extended deterioration area in the specified direction and the distance to a specified reinforcing bar that is aligned with the reinforcing bar that includes the extended deterioration area as the length of the other side.

[0063] [Supplementary Item 4] In the prediction device described in any one of Supplementary Items 1 to 3, the control unit outputs, for a degraded area that includes another degraded area in the corresponding analogical area, the degraded area and the extended degraded area as the repair range, and, for a degraded area that does not include another degraded area in the corresponding analogical area, outputs the degraded area as the repair range.

[0064] Although the above-described embodiments have been described as typical examples, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present disclosure. Therefore, the present invention should not be interpreted as being limited by the above-described embodiments, and various modifications and alterations are possible without departing from the scope of the claims. For example, multiple building blocks shown in the block diagrams of the embodiments can be combined into one, or one building block can be divided.

[0065] REFERENCE SIGNS LIST 1 Manhole 1A Ceiling 2, 2A, 2B, 2C, 2D, 2E Reinforcing bar 10 Prediction device 11 Deterioration area designation unit (first designation unit) 12 Analogy area designation unit (second designation unit) 13 Extended deterioration area designation unit (third designation unit) 14 Repair area output unit (output unit) 20 Computer 21 Processor 22 ROM 23 RAM 24 Storage 25 Input unit 26 Display unit 27 Communication I / F 29 Path

Claims

1. A prediction device for predicting the progression of deterioration of a reinforced concrete structure including multiple reinforcing bars extending in a specified direction, comprising: a first designation unit that designates a deteriorated area in each of the multiple reinforcing bars where the reinforcing bars have deteriorated based on the position of a deteriorated part in the reinforced concrete structure where deterioration is apparent and the arrangement of the multiple reinforcing bars; a second designation unit that designates a rectangular area, the length of which in the specified direction of the deteriorated area is the length of one side and the distance to a specified reinforcing bar lined up with the reinforcing bar including the deteriorated area is the length of the other side, as an analogy area in which deterioration of the reinforcing bars is inferred; and a third designation unit that, when the analogy area designated corresponding to the deteriorated area includes other deteriorated areas, designates the reinforcing bars included in the analogy area as an extended deteriorated area where deterioration is not apparent.

2. A prediction device as described in claim 1, wherein the third designation unit, when the analogous area designated corresponding to the degraded area does not include other degraded areas, designates the degraded area as a single degraded area in which degradation does not progress to its surroundings.

3. A prediction device as described in claim 1, wherein the second designation unit further designates as the analogy region a rectangular region having the length of one side of the extended deterioration region in the specified direction and the distance to a specified reinforcing bar aligned with the reinforcing bar including the extended deterioration region as the length of the other side.

4. A prediction device as described in claim 1, further comprising an output unit which outputs the repair range of the reinforced concrete structure, wherein for a deterioration area whose corresponding analogy area includes other deterioration areas, the output unit outputs the deterioration area and the extended deterioration area as the repair range, and for a deterioration area whose corresponding analogy area does not include other deterioration areas, the output unit outputs the deterioration area as the repair range.

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