Degradation detection method, degradation detection device, and program

Abstract

A deterioration determination method according to the present disclosure is executed by a deterioration determination device (1) which determines the deterioration of a structure (2) in which an internal space (IS) is defined by a plurality of surface members (21-23), said method including: an input step for accepting input of displacement information relating to the displacement (d) of a target region (2a) of a prescribed surface member (21) among the plurality of surface members (21-23); and a determination step for determining, on the basis of the displacement information, whether or not the structure (2) is deteriorating.

Description

Technical Field

[0001] The present disclosure relates to a deterioration determination method, a deterioration determination device, and a program.

Background Art

[0002] Some manholes, which are part of the social infrastructure, have been in use for over 50 years since they were installed. With the passage of such a long time, especially manholes with a box-shaped structure are deformed by the pressure from the surroundings due to the load associated with earth pressure, road surface live load, etc., and as a result, cracks (including crushing) may occur. A manhole is composed of concrete and reinforcing bars. When cracks occur in the concrete, water may penetrate from the cracked part and reach the reinforcing bars inside the concrete. As a result, the corrosion of the reinforcing bars progresses and the reinforcing bars become thinner (resulting in loss of cross-sectional area), so the structural strength of the manhole may decrease.

[0003] In addition, since a path from the outside to the inside of the manhole is formed by the cracks, earth and sand, water, etc. in the ground where the manhole is installed may flow into the manhole. As a result, danger may occur to the workers performing work in the internal space of the manhole, or the work efficiency may decrease.

[0004] Therefore, in order to maintain and manage reinforced concrete structures such as manholes, it is important to accurately detect deterioration such as cracks. At present, cracks in reinforced concrete structures, exposed reinforcement associated with cracks, etc. are confirmed visually. Also, as devices for monitoring cracks, methods using strain gauges (Non-Patent Document 1), methods using optical fiber sensors (Non-Patent Documents 2 and 3), methods for electrochemically detecting reinforcement corrosion (Non-Patent Document 4), etc. are known.

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

[0006] However, with the technologies described above, it is difficult to detect cracks in areas that cannot be inspected visually or measured from the inside of a reinforced concrete structure. Possible methods include excavating the soil near manholes buried underground to check for cracks on the outside of the reinforced concrete structure, or installing optical fiber sensors on the outside of manholes and using the optical fibers to detect cracks on the outside of the manholes. However, these methods are not practical because they require considerable expense and effort. Thus, it has been difficult to determine the deterioration of structures with high accuracy due to the difficulty in detecting cracks in areas that cannot be inspected visually or measured from the inside of a reinforced concrete structure.

[0007] In view of these circumstances, the purpose of this disclosure is to provide a deterioration determination method, a deterioration determination device, and a program that can determine the deterioration of a structure with high accuracy. [Means for solving the problem]

[0008] To solve the above problems, the deterioration determination method according to the present disclosure is a deterioration determination method executed by a deterioration determination device for determining the deterioration of a structure having a plurality of surface members that define an internal space, and includes an input step of receiving input of displacement information relating to the displacement of a target area in a predetermined surface member among the plurality of surface members, and a determination step of determining whether or not the structure is deteriorated based on the displacement information.

[0009] Furthermore, in order to solve the above problems, the deterioration determination device according to the present disclosure is a deterioration determination device for determining the deterioration of a structure having a plurality of surface members that define an internal space, and comprises an input unit that receives input of displacement information relating to the displacement of a target area in a predetermined surface member among the plurality of surface members, where the direction of displacement changes according to the deterioration of the structure, and a determination unit that determines whether or not the structure is deteriorated based on the displacement information.

[0010] Furthermore, in order to solve the above-mentioned problems, the program relating to this disclosure causes a computer to execute the degradation determination method described above. [Effects of the Invention]

[0011] According to the deterioration determination method, deterioration determination device, and program described herein, deterioration of structures can be determined with high accuracy. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic diagram showing an example of a deterioration determination device according to the present disclosure. [Figure 2] Figure 1 is a perspective view showing an example of a manhole, which is a structure in which deterioration can be detected by the deterioration detection device. [Figure 3A]It is a schematic diagram for explaining the stress that occurs in the manhole shown in Fig. 2 in a state where no deterioration has occurred. [Figure 3B] It is a schematic diagram showing the cracks generated in the manhole due to the stress shown in Fig. 3A. [Figure 3C] It is a schematic diagram showing that the upper surface member of the manhole is simply supported due to the occurrence of deterioration such as the cracks shown in Fig. 3B. [Figure 3D] It is a schematic diagram for explaining the stress in the manhole shown in Fig. 3C. [Figure 4A] It is a diagram schematically showing the manhole shown in Fig. 2. [Figure 4B] It is a top view showing the manhole shown in Fig. 4A. [Figure 5] It is a diagram showing an example of the change over time of the displacement in the target area. [Figure 6] It is a diagram showing an example of the determination result output by the deterioration determination device shown in Fig. 1. [Figure 7] It is a flowchart showing an example of the operation executed by the deterioration determination device shown in Fig. 1. [Figure 8] It is a diagram showing an example of the hardware configuration of the deterioration device shown in Fig. 1.

Mode for Carrying Out the Invention

[0013] <Configuration of Deterioration Determination Device> The deterioration determination device 1 of the present embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing an example of the deterioration determination device 1 according to the present embodiment.

[0014] The deterioration determination device 1 determines the deterioration of the structure 2 as shown in Fig. 2. The structure 2 is, for example, a manhole and may be disposed underground. In Fig. 2, two face members of the manhole are omitted for explaining the internal space IS of the manhole.

[0015] Structure 2 has a plurality of surface members 21 to 23 that define the internal space IS. In this example, the plurality of surface members include an upper surface member 21, a side surface member 22, and a lower surface member 23. For example, the upper surface member 21 is the upper floor slab, the side surface member 22 is the side wall, and the lower surface member 23 is the lower floor slab.

[0016] Furthermore, the top member 21, the side member 22, and the bottom member 23 may each be composed of reinforcing bars and concrete covering the reinforcing bars. The top member 21 may have a hole HL1 defined for workers to enter and exit. The side member 22 of the structure 2 may have a cable hole HL2 defined for cables such as communication cables to pass through.

[0017] Furthermore, the multiple surface members 21 to 23 form corner sections 24, which are bent portions in the structure 2. In this example, the corner sections 24 are formed at the joint between the upper surface member 21 and the side surface member 22, at the joint between two side surface members 22, and at the joint between the side surface member 22 and the lower surface member 23. Also, when the structure 2 is not deteriorated (cracks are not propagating), the upper surface member 21, the side surface members 22, and the lower surface member 23 constitute the structure 2 in a rigid frame structure.

[0018] A cable 31 may be inserted into the internal space IS from the outside through a cable hole HL2. Furthermore, a cable arrangement member 32 for arranging the cable 31 may be attached to the side member 22 by a support member 33 within the internal space IS. A terminal box 34 may also be located within the internal space IS. However, the internal space IS is not limited to these examples, and any member appropriate to the purpose of the structure 2 may be provided within it.

[0019] Here, we will explain the principle by which the deterioration determination device 1 determines the deterioration of the structure 2. In this explanation, we will describe the principle of determining deterioration based on the displacement of the upper member 21, but this principle can also be applied to the side member 22 and the lower member 23.

[0020] As shown in Figure 3A, if the structure 2 is not deteriorated, when a load W1 from above and a load W2 from the side are applied to the structure 2, in the upper surface member 21, the target area 2a is displaced outward due to tensile stress from the outside, and the non-target area 2b, which is located more centrally than the target area 2a, is displaced towards the internal space IS due to tensile stress from the internal space IS side. For example, as described above, if the structure 2 is buried underground, the load from above is generated by the soil on the ground surface side of the structure 2, objects placed on the ground surface, vehicles passing on the ground surface, etc.

[0021] The target region 2a is a region where the direction of displacement changes in accordance with the deterioration of the structure. Specifically, the target region 2a is a part of a predetermined surface member (for example, the upper surface member 21) among the multiple surface members 21 to 23. As described above, in a configuration in which the structure 2 has a corner portion 24, the target region 2a is a part of the predetermined surface member and is the region on the corner portion 24 side. Specifically, the target region is the region on the corner portion 24 side from the inflection point of the bending moment when no deterioration has occurred in the structure 2 on the predetermined surface member.

[0022] When a load is applied to structure 2 from above, cracks CR occur in the region of structure 2 where an outward tensile load is applied, i.e., near the corners 24, as shown in Figure 3B. As the cracks CR propagate, the upper member 21 of structure 2 approaches a state of simple support, as shown in Figure 3C, from a state in which it constitutes a rigid frame structure. Simple support means that it is supported at a point (the upper vertex of the triangle symbol in the example shown in Figure 3C) by another member (side member 22). When a load W1 from above and a load W2 from the side are applied to the simply supported upper member 21, as shown in Figure 3D, both the target region 2a and the non-target region 2b of the upper member 21 are displaced toward the internal space IS due to tensile stress from the internal space IS side.

[0023] Thus, when the crack CR in structure 2 is not progressing (the structure is not deteriorating), the target area 2a is displaced outward, whereas when the crack CR in structure 2 progresses (the structure deteriorates), the outward displacement in the target area 2a decreases. Furthermore, as the crack CR progresses, the target area 2a is displaced toward the internal space IS. Therefore, the deterioration determination device 1 can determine the deterioration of structure 2 based on the displacement of the target area 2a.

[0024] As shown in Figure 1, the degradation determination device 1 comprises an input unit 11, a region determination unit 12, a storage unit 13, a displacement detection unit 14, a smoothing unit 15, a determination unit 16, and an output unit 17. The input unit 11 is configured by an input interface. The input interface may also be a communication interface. For example, standards such as Ethernet®, FDDI (Fiber Distributed Data Interface), and Wi-Fi® may be used for the communication interface. The region determination unit 12, the displacement detection unit 14, the smoothing unit 15, and the determination unit 16 are configured by a controller. The controller may be configured by dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array), or by a processor, or by including both. The storage unit 13 is configured by memory. The memory may consist of an HDD (Hard Disk Drive), SSD (Solid State Drive), EEPROM (Electrically Erasable Programmable Read-Only Memory), ROM (Read-Only Memory), and RAM (Random Access Memory), etc. The output unit 17 is composed of an output interface. The output interface may be a communication interface.

[0025] The input unit 11 receives input of displacement information relating to the displacement d of a target region 2a in a predetermined surface member (for example, the upper surface member 21) among the multiple surface members 21 to 23, where the direction of displacement changes according to the deterioration of the structure 2.

[0026] Displacement information may be signal information indicating the displacement d of the target area 2a measured by a displacement measuring instrument such as a strain gauge, contact gauge, or displacement meter. Alternatively, displacement information may be image information indicating an image of the target area 2a captured by an imaging device. Alternatively, displacement information may be information indicating the numerical value itself that represents the displacement d of the target area 2a. Displacement information may be acquired by a worker in the internal space IS of the structure 2. However, since cracks CR have occurred in the structure 2 and there is a possibility of damage due to these cracks CR, it is preferable to use any safe technology that allows the worker to acquire displacement information without entering the internal space IS of the structure 2. If the internal space IS of the structure 2 is confirmed to be safe through any test, etc., a worker may enter the internal space IS of the manhole to acquire displacement information.

[0027] The displacement information may include information about the displacement d that changes over time. The input unit 11 may accept input of displacement information at predetermined time intervals, or it may accept input of displacement information irregularly.

[0028] The region determination unit 12 determines the target region 2a in which the direction of displacement changes according to the deterioration of the structure, as described above. For example, the region determination unit 12 may determine the target region 2a to be a part of a predetermined surface member 21 to 23, specifically the region on the corner 24 side. More specifically, the region determination unit 12 may determine the target region 2a to be the region on the corner 24 side from the inflection point of the bending moment when no deterioration has occurred in the structure 2, in the predetermined surface member 21 to 23.

[0029] In the example shown in Figures 4A and 4B, the region determination section 12 extends from the edge of the upper surface member 21 that extends in the x-axis direction to a length L shown in the following equation (1) in the y-axis direction. yThe region that is as follows can be determined as the target region 2a. Note that in equation (1), M BC This is the bending moment that occurs at vertex B, and S BC This is the shear force generated at point B. As mentioned above, W1 is the load applied to the structure 2 from above, that is, the load applied to the upper surface member 21.

number

[0030] Similarly, the region determination unit 12 extends from the edge of the upper surface member 21 that extends in the y-axis direction to the x-axis direction, along the length L shown in equation (2). x The following region can be determined as the target region 2a.

number

[0031] The memory unit 13 stores region information indicating the target region 2a determined by the region determination unit 12.

[0032] The displacement detection unit 14 detects the displacement d of the target region 2a in the structure 2 based on the displacement information received as input by the input unit 11. Specifically, the displacement detection unit 14 detects the displacement d at a predetermined position in the target region 2a. The predetermined position may be any position within the target region 2a. As shown in Figure 4B, if the target region 2a is a region extending in the x-axis direction, the predetermined position is the center in the x-axis direction (i.e., the distance from one end in the x-axis direction is L). A It is desirable that the position be such that L is the center in the y-axis direction (i.e., the distance from one end in the y-axis direction is L). Similarly, if the target region 2a is a region that extends in the y-axis direction, the predetermined position is the center in the y-axis direction (i.e., the distance from one end in the y-axis direction is L). B It is desirable that the position be such that it is / 2.

[0033] In a configuration where the input unit 11 receives displacement information for each position of the structure 2, the displacement detection unit 14 may extract displacement information for the target region 2a indicated by the region information stored in the storage unit 13 and detect displacement d based on said displacement information. Alternatively, in a configuration where the input unit 11 receives input of displacement information for positions within the target region 2a, the displacement detection unit 14 may detect displacement d based on the displacement information for the target region 2a that has been received as input.

[0034] For example, if the displacement information is signal information indicating a displacement d measured using a measuring instrument, the displacement detection unit 14 can detect the displacement d of the target region 2a based on the signal information. As another example, if the displacement information is image information indicating an image of the target region 2a captured by an imaging device, the displacement detection unit 14 can detect the displacement d of the target region 2a based on the image information using any method such as digital image correlation. As yet another example, if the displacement information is the numerical value itself indicating the displacement d of the target region 2a, the displacement detection unit 14 can detect this numerical value as the displacement d.

[0035] The smoothing unit 15 smooths the time-dependent changes in the displacement d detected by the displacement detection unit 14. Specifically, the smoothing unit 15 calculates the long-term time-dependent changes in the displacement d. Long-term time-dependent changes refer to the time-dependent changes in the displacement d at frequencies lower than the frequency of the time-dependent changes in the load expected in the environment in which the structure 2 is installed. This allows the smoothing unit 15 to remove the time-dependent changes in the displacement d due to short-term stress fluctuations. For example, as shown in Figure 5, the smoothing unit 15 may calculate the wavelength λ from the waveform showing the time-dependent changes in the displacement d (solid line in Figure 5) using a Fast Fourier Transform (FFT), and then perform smoothing processing to make the wavelength longer than wavelength λ (dashed line in Figure 5). Note that in Figure 5, displacement outward from the initial position is shown as a positive displacement (tensile), and displacement toward the internal space IS side from the initial position is shown as a negative displacement (compression).

[0036] The determination unit 16 determines whether or not the structure 2 is deteriorating based on the displacement d of the target area 2a in the structure 2.

[0037] For example, the determination unit 16 may determine whether the time derivative dd1 / dt of the smoothed displacement d1, which is the displacement d whose change over time has been smoothed by the smoothing unit 15, is greater than 0, assuming that the displacement d of the structure 2 outward in the target region 2a is a positive displacement. If the determination unit 16 determines that the time derivative of the smoothed displacement d1 is greater than 0, it may determine that the structure 2 has not deteriorated, and if the time derivative dd1 / dt of the smoothed displacement d1 is 0 or less, it may determine that the structure 2 has deteriorated.

[0038] Furthermore, if the determination unit 16 determines that the structure 2 is deteriorating (i.e., the time derivative dd1 / dt is 0 or less), it may determine that the smaller the smoothing displacement d1, the greater the degree of deterioration of the structure 2. For example, the determination unit 16 may determine whether the smoothing displacement d1 is greater than 0, and if it determines that the smoothing displacement d1 is 0 or less, it may determine that the structure 2 is deteriorating to the point of being in a dangerous state.

[0039] Furthermore, the determination unit 16 may determine whether the displacement d from the initial position of the target area 2a is greater than 0, assuming that the displacement d of the structure 2 outward in the target area 2a is a positive displacement. The initial position is, for example, the position of the target area 2a when the structure 2 is newly installed. In such a configuration, if the determination unit 16 determines that the displacement d is 0 or less, it may determine that the structure 2 is deteriorating.

[0040] The output unit 17 outputs the determination result determined by the determination unit 16. For example, the output unit 17 may display the determination result on a display device configured as an integral part of or separately from the deterioration determination device 1. In this case, as shown in Figure 6, the output unit 17 can display an image of the structure 2 and a mark (in the example in Figure 6, a thick rectangle on the upper surface member 21) surrounding the target area 2a that has been determined to be deteriorated. In such an example, the manager, workers, etc. of the structure 2 can intuitively recognize the area where the crack CR causing deterioration is expected to be progressing by referring to the determination result displayed on the display device.

[0041] Furthermore, the output unit 17 may output the judgment result to another device via a communication network, or it may output the judgment result by any method such as voice.

[0042] <Operation of the deterioration detection device> Here, the operation of the deterioration determination device 1 according to this embodiment will be described with reference to Figure 7. Figure 7 is a flowchart showing an example of the operation of the deterioration determination device 1 according to this embodiment. The operation of the deterioration determination device 1 described with reference to Figure 7 corresponds to an example of the deterioration determination method of the deterioration determination device 1 according to this embodiment, in which the deterioration of a structure 2 is determined by a plurality of surface members 21 to 23, and a corner portion 24 is formed.

[0043] In step S11, the region determination unit 12 determines the target region 2a in which the direction of displacement changes according to the deterioration of the structure 2.

[0044] In step S12, the input unit 11 receives input of displacement information relating to the displacement of a target region 2a in a predetermined surface member among the plurality of surface members 21 to 23, where the direction of displacement changes according to the deterioration of the structure 2 (input step).

[0045] In step S13, the displacement detection unit 14 detects the displacement d of the target area 2a in the structure 2 based on the displacement information (displacement detection step).

[0046] In step S14, the smoothing unit 15 smooths out the change in displacement d over time (smoothing step).

[0047] Next, the determination unit 16 determines whether or not the structure 2 is deteriorating based on the displacement d derived from the displacement information (determination step).

[0048] In step S15, the determination unit 16 determines whether the time derivative of the smoothed displacement d1, which is the smoothed displacement d, is greater than 0, assuming that the displacement d to the outside of the target region 2a is a positive displacement.

[0049] If, in step S15, it is determined that the time derivative of the smoothing displacement d1 is greater than 0, then in step S16, the determination unit 16 determines that the structure 2 has not deteriorated.

[0050] If, in step S15, it is determined that the time derivative of the smoothing displacement d1 is 0 or less, then in step S17, the determination unit 16 determines that the structure 2 is deteriorated.

[0051] In step S18, the determination unit 16 determines the degree of deterioration of the structure 2 based on the smoothing displacement d1. Specifically, the determination unit 16 determines that the smaller the smoothing displacement d1, the higher the degree of deterioration of the structure 2. For example, the determination unit 16 may determine whether the smoothing displacement d1 is greater than 0, and if it determines that the smoothing displacement d1 is 0 or less, it may determine that the structure 2 is deteriorated to the point of being in a dangerous state.

[0052] In step S19, the output unit 17 outputs the determination result determined in the determination step.

[0053] Furthermore, the deterioration determination device 1 does not have to perform step S11 described above. In this case, the deterioration determination device 1 may accept input of information indicating the target area 2a determined by another device, and input of displacement information relating to the displacement measured based on said information. Also, the deterioration determination device 1 does not have to perform step S18 described above.

[0054] As described above, the deterioration determination method according to this embodiment is a deterioration determination method executed by a deterioration determination device 1 that determines the deterioration of a structure 2 having a plurality of surface members 21 to 23 defining an internal space IS, and includes an input step of receiving input of displacement information relating to the displacement d of a target region 2a in a predetermined surface member among the plurality of surface members 21 to 23, in which the direction of displacement changes according to the deterioration of the structure 2, and a determination step of determining whether or not the structure 2 is deteriorated based on the displacement information.

[0055] This makes it possible to determine the deterioration of structure 2 caused by cracks CR, etc., that cannot be confirmed from the internal space IS side, using displacement information. Therefore, compared to the conventional method of determining the deterioration of structure 2 based on cracks CR confirmed from the internal space IS side, the deterioration determination method according to this embodiment can determine the deterioration of the structure with high accuracy. Accordingly, the manager of structure 2 can properly maintain and manage the structure 2, thereby increasing the likelihood that structure 2 will be used safely. In particular, in the case of structure 2 installed underground, there is a high possibility that cracks CR will occur in the upper surface member 21 due to high load from the ground surface side, so this determination method is particularly effective and useful in the configuration in which the above-mentioned predetermined member is the upper surface member 21.

[0056] Furthermore, in the deterioration determination method according to this embodiment, the displacement information includes information indicating the displacement that changes over time, and the deterioration determination method further includes a smoothing step that smooths the change in displacement d over time, and the determination step includes determining whether the time derivative dd1 / dt of the smoothed displacement d1, which is the smoothed displacement d, is greater than 0 when the displacement d outward of the structure 2 in the target area is considered a positive displacement, and determining that the structure 2 is not deteriorated if the time derivative dd1 / dt of the smoothed displacement d1 is greater than 0, and determining that the structure 2 is deteriorated if the time derivative dd1 / dt of the smoothed displacement d1 is 0 or less. This makes it possible to determine whether the structure 2 is deteriorated.

[0057] Furthermore, in the deterioration determination method according to this embodiment, the determination step determines whether the displacement d from the initial position of the target region 2a is greater than 0, assuming that the displacement d of the structure 2 outward in the target region 2a is a positive displacement. If it is determined that the displacement d is 0 or less, it is determined that the structure 2 is deteriorated. This makes it possible to determine that the deterioration has progressed and the structure 2 is in a dangerous state.

[0058] (modified version) In the embodiment described above, the degradation determination device 1 includes a region determination unit 12 and a storage unit 13, but is not limited to this. For example, the degradation determination device 1 may not include a region determination unit 12 and a storage unit 13, and another device or the like may determine the target region 2a by any method. In such a configuration, the input unit 11 receives input of displacement information indicating the displacement d of the determined target region 2a, and the displacement detection unit 14, the smoothing unit 15, and the determination unit 16 may perform the above-described processing based on the displacement d indicated by the displacement information.

[0059] <Program> The degradation detection device 1 described above can be implemented by a computer 101. A program may also be provided to enable the computer 101 to function as the degradation detection device 1. This program may be stored on a storage medium or provided via a network. Figure 8 is a block diagram illustrating the schematic configuration of a computer 101 functioning as the degradation detection device 1. Here, the computer 101 may be a general-purpose computer, a dedicated computer, a workstation, a PC (Personal Computer), an electronic notepad, etc. Program instructions may be program code, code segments, etc., for executing the necessary tasks.

[0060] As shown in Figure 8, the computer 101 comprises a processor 110, a ROM (Read Only Memory) 120, a RAM (Random Access Memory) 130, storage 140, an input unit 150, an output unit 160, and a communication interface (I / F) 170. Each component is connected to the others via a bus 180 so as to be able to communicate with each other. The processor 110 is specifically a CPU (Central Processing Unit), MPU (Micro Processing Unit), GPU (Graphics Processing Unit), DSP (Digital Signal Processor), SoC (System on a Chip), etc., and may be composed of multiple processors of the same or different types.

[0061] The processor 110 controls each component and performs various calculations. Specifically, the processor 110 reads a program from the ROM 120 or storage 140 and executes the program using the RAM 130 as a working area. The processor 110 controls each component and performs various calculations according to the program stored in the ROM 120 or storage 140. In the embodiment described above, the program according to this disclosure is stored in the ROM 120 or storage 140.

[0062] The program may be stored on a storage medium readable by the computer 101. Using such a storage medium, the program can be installed on the computer 101. Here, the storage medium on which the program is stored may be a non-transitory storage medium. The non-transitory storage medium is not particularly limited, but may include, for example, a CD-ROM, DVD-ROM, or USB (Universal Serial Bus) memory. Furthermore, the program may be downloaded from an external device via a network.

[0063] ROM120 stores various programs and data. RAM130 temporarily stores programs or data as a working area. Storage140 consists of an HDD (Hard Disk Drive) or SSD (Solid State Drive) and stores various programs and data, including the operating system.

[0064] The input unit 150 is an interface for receiving information, and the output unit 160 is an interface for outputting information.

[0065] The communication interface 170 is an interface for communicating with external devices.

[0066] The following additional information is disclosed regarding the embodiments described above. [Additional note 1] A deterioration determination method performed by a deterioration determination device for determining the deterioration of a structure having multiple surface members that define an internal space, The system accepts input of displacement information relating to the displacement of a target region in a predetermined surface member among the plurality of surface members, where the direction of displacement changes according to the deterioration of the structure. Based on the displacement information, it is determined whether or not the structure is deteriorating. Deterioration judgment method. [Additional note 2] The displacement information includes information indicating the displacement that changes over time, The method further includes a smoothing step to smooth out the temporal changes in the displacement, The deterioration determination method according to Appendix 1, comprising the steps of determining whether the time derivative of the smoothed displacement, which is the displacement after the change over time has been smoothed, is greater than 0 when the displacement outward of the structure in the target area is defined as a positive displacement, and determining that the structure is not deteriorated if the time derivative of the smoothed displacement is greater than 0, and determining that the structure is deteriorated if the time derivative of the smoothed displacement is 0 or less. [Additional note 3] The deterioration determination method according to Appendix 2, wherein the determination step includes determining whether the smoothing displacement from the initial position of the target area is greater than 0 when the displacement of the structure outward in the target area is considered a positive displacement, and determining that the structure is deteriorated if it is determined that the smoothing displacement is 0 or less. [Additional note 4] The aforementioned plurality of surface members form corners, The deterioration determination method according to any one of the appendix items 1 to 3, wherein the target area is a part of the predetermined surface member and is the area on the corner side. [Additional note 5] The deterioration determination method according to Appendix 4, wherein the target area is the area on the corner side of the predetermined surface member, from the point of inversion of the bending moment when no deterioration has occurred in the structure. [Additional note 6] The deterioration determination method according to any one of the appendices 1 to 5, wherein the displacement information is signal information indicating the displacement of the target area measured by a displacement measuring instrument, or image information indicating an image of the target area captured by an imaging device. [Additional note 7] A deterioration determination device for determining the deterioration of a structure having multiple surface members that define an internal space, comprising a controller, the controller is The system accepts input of displacement information relating to the displacement of a target region in a predetermined surface member among the plurality of surface members, where the direction of displacement changes according to the deterioration of the structure. Based on the displacement information, it is determined whether or not the structure is deteriorating. Deterioration determination device. [Additional note 8] A non-temporary storage medium storing a program executable by a computer, wherein the computer is a non-temporary storage medium storing a program that operates the degradation determination method described in any one of the appendices 1 to 6.

[0067] All documents, patent applications, and technologies described herein are incorporated by reference to the same extent as if each individual document, patent application, and technology were specifically and individually described as being incorporated by reference.

[0068] Although the embodiments described above are representative examples, it will be apparent to those skilled in the art that many modifications and substitutions are possible within the spirit and scope of this disclosure. Therefore, the present invention should not be construed as being limited by the embodiments described above, and various modifications or changes are possible without departing from the claims. [Explanation of Symbols]

[0069] 1 Deterioration determination device 2 structures 2a Target area 2b Non-symmetric area 11 Input section 12 Area determination section 13 Storage section 14 Displacement detection unit 15 Smoothing section 16 Judgment section 17 Output section 21 Upper member 22 Side members 23 Bottom member 24 Corner 31 Cables 32. Mounting components 33 Support Member 34 Terminal box 101 Computer 110 processors 120 ROM 130 RAM 140 storage 150 Input section 160 Output section 170 Communication Interfaces 180 bus

Claims

1. A deterioration determination method performed by a deterioration determination device for determining the deterioration of a structure having multiple surface members that define an internal space, An input step that receives input of displacement information relating to the displacement of a target region, which is the region from the inverse point of the bending moment to the corner portion of a predetermined surface member among the plurality of surface members when no deterioration has occurred in the structure, A determination step of determining whether or not the structure is deteriorating based on the displacement information, A method for determining deterioration, including the following.

2. The displacement information includes information indicating the displacement that changes over time, The method further includes a smoothing step to smooth out the temporal changes in the displacement, The deterioration determination method according to claim 1, further comprising the steps of: determining whether the time derivative of the smoothed displacement, which is the displacement after the change over time has been smoothed, is greater than zero, assuming that the displacement outward of the structure in the target area is a positive displacement; determining that the structure is not deteriorated if the time derivative of the smoothed displacement is greater than zero; and determining that the structure is deteriorated if the time derivative of the smoothed displacement is less than or equal to zero.

3. The deterioration determination method according to claim 2, wherein the determination step includes determining whether the smoothing displacement from the initial position of the target area is greater than 0 when the displacement of the structure outward in the target area is defined as a positive displacement, and determining that the structure is deteriorated if it is determined that the smoothing displacement is 0 or less.

4. The aforementioned plurality of surface members form corners, The deterioration determination method according to any one of claims 1 to 3, wherein the target area is a part of the predetermined surface member and is the area on the corner side.

5. The deterioration determination method according to claim 4, wherein the target area is the area on the corner side of the predetermined surface member, from the point of inversion of the bending moment when no deterioration has occurred in the structure.

6. The deterioration determination method according to any one of claims 1 to 3, wherein the displacement information is signal information indicating the displacement of the target area measured by a displacement measuring instrument, or image information indicating an image of the target area captured by an imaging device.

7. A deterioration determination device for determining the deterioration of a structure having multiple surface members that define an internal space, An input unit that receives input of displacement information relating to the displacement of a target region, which is the region from the inverse point of the bending moment to the corner portion side of a predetermined surface member among the plurality of surface members when no deterioration has occurred in the structure, A determination unit that determines whether or not the structure is deteriorating based on the displacement information, A deterioration detection device equipped with the following features.

8. A program for causing a computer to perform the deterioration determination method described in any one of claims 1 to 3.

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