Information processing device

Abstract

An information processing device (10) comprises a control unit (11) provided with a control unit that: acquires a plurality of structural models representing each of a plurality of structures, each of which is provided with a primary lining and a secondary lining provided inside the primary lining; executes structural analysis on each of the plurality of structural models; acquires time information indicating the time until cracking occurs in the secondary lining; and, on the basis of the time information, outputs priority information indicating the plurality of structures in the order of priority for inspection.

Description

Information processing device

[0001] The present disclosure relates to an information processing device.

[0002] There exists a tunnel constructed in the natural ground, which comprises a primary lining and a secondary lining along the circumferential direction of the tunnel. Figures 10A and 10B show a cross section perpendicular to the axial direction of a tunnel TN comprising a primary lining L1 and a secondary lining L2. As shown in Figures 10A and 10B, the primary lining L1 is provided to cover the secondary lining L2 on the radially inner side of the tunnel from the outside. The primary lining L1 includes multiple steel segments, and the secondary lining L2 includes concrete. As shown in Figure 10B, over time, the thickness of the primary lining L1 of the underground tunnel TN shown in Figure 10A decreases from its original position indicated by the dashed line due to the progression of corrosion. Furthermore, deterioration of the primary lining L1 generates loads such as earth pressure or water pressure on the secondary lining L2, resulting in deformations such as cracks and cracks. Thus, a decrease in the strength of the entire tunnel TN over time is expected. For such tunnels, inspections for maintenance are uniformly carried out regardless of the tunnel's installation environment, size, etc. For example, Non-Patent Document 1 discloses that a measuring vehicle is used to measure the surface condition of the lining concrete and then the surface condition is visually inspected.

[0003] Nobuo Sano and five others, "Proposal for a rational inspection system for expressway tunnels," Journal of the Japan Society of Civil Engineers, Vol. 63, No. 3, pp. 391-400, 2007, [online], [Retrieved July 2, 2024], Internet<URL: https: / / www.jstage.jst.go.jp / article / jscejd / 63 / 3 / 63_3_391 / _pdf / -char / ja>

[0004] Because the relationship between the degree of deterioration of the primary lining and the natural environment of the river that the primary lining contacts is uncertain, it is difficult to determine which tunnel inspection should be prioritized for a tunnel consisting of a primary lining and a secondary lining. There is a need to improve the efficiency of inspections of structures that include primary and secondary linings.

[0005] The purpose of the present disclosure, made in consideration of the above circumstances, is to improve the efficiency of inspection of structures including primary and secondary linings.

[0006] An information processing device according to one embodiment acquires a plurality of structural models representing a plurality of structures, each of which comprises a primary lining and a secondary lining provided inside the primary lining; performs structural analysis on each of the plurality of structural models to acquire time information indicating the time until cracks occur in the secondary lining; and includes a control unit that outputs priority information indicating the plurality of structures in order of inspection priority based on the time information.

[0007] According to the present disclosure, it is possible to improve the efficiency of inspection of structures including primary linings and secondary linings.

[0008] 1 is a block diagram showing a configuration of an information processing device. FIG. 2 is a diagram for explaining a tunnel. FIG. 3 is a flowchart showing an example of operation of an information processing device. FIG. 4 is a diagram for explaining a structural model. FIG. 5 is a diagram for explaining a steel segment. FIG. 6 is a diagram for explaining a tunnel. FIG. 7 is a diagram for explaining a structural model. FIG. 8 is a diagram for explaining a segment ring. FIG. 9 is a diagram for explaining a segment ring. FIG. 10 is a diagram for explaining a segment joint. FIG. 11 is a diagram for explaining a segment joint model. FIG. 12 is a table showing an example of priority information. FIG. 13 is a diagram for explaining a tunnel. FIG. 14 is a diagram for explaining a tunnel.

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0010] In each drawing, the same or corresponding parts are denoted by the same reference numerals. In the description of this embodiment, the description of the same or corresponding parts will be omitted or simplified as appropriate.

[0011] An overview of this embodiment will be described with reference to Fig. 1. An information processing device 10 according to this embodiment is, for example, a general-purpose computer such as a PC or a tablet, a server computer such as a cloud server, or a dedicated computer. "PC" is an abbreviation for personal computer.

[0012] The information processing device 10 acquires a plurality of structural models representing a plurality of structures, each of which includes a primary lining and a secondary lining provided inside the primary lining. The information processing device 10 performs structural analysis on each of the plurality of structural models to acquire time information indicating the time until cracks occur in the secondary lining. The information processing device 10 outputs priority information indicating the order of inspection priority for the plurality of structures based on the time information.

[0013] In this embodiment, the structure is a tunnel. However, the structure is not limited thereto, and may be a manhole, a basement, or the like. The primary lining is provided to cover from the outside a secondary lining located radially inside the tunnel. FIG. 2 shows a tunnel T according to this embodiment. The primary lining according to this embodiment is a plurality of steel segments S provided along the circumferential direction of the tunnel T. The secondary lining according to this embodiment is made of concrete W. The tunnel T includes a shield tunnel for laying communication cables, gas pipes, power transmission lines, and the like. As shown in FIG. 2 , inside the tunnel T, facilities E on which cables C are installed and walkways P for workers to move around are provided. The tunnel T is installed at a depth of, for example, 10 to 30 meters from the ground surface. Each of the plurality of steel segments S has an arc-shaped cross section. The plurality of steel segments S are connected to each other in the circumferential direction of the tunnel via segment joints. A plurality of steel segments S connected around the entire tunnel constitute a segment ring. The segment rings are further connected in the axial direction of the tunnel via ring joints. The outer surfaces of the steel segments S are provided with skin plates that come into direct contact with the soil.

[0014] According to this embodiment, the time when cracks will occur in the secondary lining can be accurately predicted using a structural model generated for each of multiple tunnels. This makes it possible to prioritize and inspect multiple tunnels while preventing inspections from being conducted after cracks have occurred. This makes it possible to improve the efficiency of inspections of structures including the primary and secondary linings.

[0015] The configuration of an information processing device 10 according to this embodiment will be described with reference to Fig. 1. The information processing device 10 includes a control unit 11, a storage unit 12, a communication unit 13, an input unit 14, and an output unit 15.

[0016] The control unit 11 includes at least one processor, at least one programmable circuit, at least one dedicated circuit, or any combination thereof. The processor is a general-purpose processor such as a CPU or GPU, or a dedicated processor specialized for specific processing. "CPU" is an abbreviation for central processing unit. "GPU" is an abbreviation for graphics processing unit. An example of the programmable circuit is an FPGA. "FPGA" is an abbreviation for field-programmable gate array. An example of the dedicated circuit is an ASIC. "ASIC" is an abbreviation for application specific integrated circuit. The control unit 11 executes processing related to the operation of the information processing device 10 while controlling each unit of the information processing device 10.

[0017] The storage unit 12 includes at least one semiconductor memory, at least one magnetic memory, at least one optical memory, or any combination thereof. The semiconductor memory is, for example, a RAM, a ROM, or a flash memory. "RAM" is an abbreviation for random access memory. "ROM" is an abbreviation for read only memory. RAM is, for example, an SRAM or a DRAM. "SRAM" is an abbreviation for static random access memory. "DRAM" is an abbreviation for dynamic random access memory. ROM is, for example, an EEPROM. "EEPROM" is an abbreviation for electrically erasable programmable read only memory. Flash memory is, for example, an SSD. "SSD" is an abbreviation for solid-state drive. Magnetic memory is, for example, an HDD. "HDD" is an abbreviation for hard disk drive. The storage unit 12 functions, for example, as a main storage device, an auxiliary storage device, or a cache memory. The storage unit 12 stores information used in the operation of the information processing device 10 and information obtained by the operation of the information processing device 10 .

[0018] The communication unit 13 includes at least one communication module. The communication module is, for example, a module compatible with a wired LAN communication standard such as Ethernet (registered trademark), a wireless LAN communication standard such as IEEE 802.11, or a mobile communication standard such as LTE, 4G, or 5G. "LAN" is an abbreviation for local area network. "IEEE" is an abbreviation for Institute of Electrical and Electronics Engineers. "LTE" is an abbreviation for Long Term Evolution. "4G" is an abbreviation for 4th generation. "5G" is an abbreviation for 5th generation. The communication unit 13 receives information used in the operation of the information processing device 10 and transmits information obtained by the operation of the information processing device 10. The communication unit 13 enables the information processing device 10 to send and receive information to and from other devices via a network.

[0019] The network may include the Internet, at least one WAN, at least one MAN, or a combination thereof. "WAN" is an abbreviation for wide area network. "MAN" is an abbreviation for metropolitan area network. The network may include at least one wireless network, at least one optical network, or a combination thereof. The wireless network may be, for example, an ad hoc network, a cellular network, a wireless LAN, a satellite communication network, or a terrestrial microwave network.

[0020] The input unit 14 includes at least one input interface. The input interface is, for example, a physical key, a capacitance key, a pointing device, a touch screen integrated with a display, or a microphone. The input unit 14 accepts an operation to input information used in the operation of the information processing device 10. The input unit 14 may be connected to the information processing device 10 as an external input device instead of being provided in the information processing device 10. Any connection method can be used, such as a Universal Serial Bus (USB), a High-Definition Multimedia Interface (HDMI) (registered trademark), or Bluetooth (registered trademark).

[0021] The output unit 15 includes at least one output interface. The output interface is, for example, a display or a speaker. The display is, for example, an LCD (Liquid Crystal Display) or an organic EL (Electro Luminescent) display. The output unit 15 outputs information obtained by the operation of the information processing device 10. The output unit 15 may be connected to the information processing device 10 as an external output device instead of being provided in the information processing device 10. Any connection method can be used, such as USB, HDMI (registered trademark), or Bluetooth (registered trademark).

[0022] The functions of the information processing device 10 are realized by executing a program according to this embodiment on a processor serving as the control unit 11. That is, the functions of the information processing device 10 are realized by software. The program causes a computer to execute the operations of the information processing device 10, thereby causing the computer to function as the information processing device 10. That is, the computer functions as the information processing device 10 by executing the operations of the information processing device 10 in accordance with the program.

[0023] The program can be stored on a non-transitory computer-readable medium. Examples of the non-transitory computer-readable medium include flash memory, magnetic recording devices, optical disks, magneto-optical recording media, and ROMs. The program can be distributed by selling, transferring, or lending portable media such as SD cards, DVDs, or CD-ROMs that store the program. "SD" is an abbreviation for Secure Digital. "DVD" is an abbreviation for digital versatile disc. "CD-ROM" is an abbreviation for compact disc read only memory. The program can also be distributed by storing it in the storage of a server and transferring it from the server to another computer. The program can also be provided as a program product.

[0024] A computer temporarily stores a program stored on a portable medium or transferred from a server in its main storage device. The computer then reads the program stored in the main storage device with its processor and executes processing in accordance with the read program. The computer may also read the program directly from the portable medium and execute processing in accordance with the program. The computer may also execute processing in accordance with the received program each time a program is transferred from the server to the computer. Processing may also be executed using a so-called ASP-type service that realizes functions simply by issuing execution instructions and obtaining results, without transferring the program from the server to the computer. "ASP" is an abbreviation for application service provider. A program is information used for processing by a computer and includes something equivalent to a program. For example, data that is not a direct instruction to a computer but has properties that define computer processing falls under the category of "something equivalent to a program."

[0025] Some or all of the functions of the information processing device 10 may be implemented by a programmable circuit or a dedicated circuit as the control unit 11. In other words, some or all of the functions of the information processing device 10 may be implemented by hardware.

[0026] Next, the operation of the information processing device 10 according to this embodiment will be described with reference to FIGS.

[0027] In step S101 of Fig. 3, the control unit 11 of the information processing device 10 acquires deterioration information indicating the degree of deterioration of the primary lining for each of a plurality of tunnels. Specifically, the degree of deterioration of the primary lining is the corrosion depth from the surface of the steel segment. Any method may be employed to acquire the deterioration information. The control unit 11 may accept user input of the deterioration information via the input unit 14. The control unit 11 may read the deterioration information from the storage unit 12.

[0028] When the installation period of the target structure is input, the control unit 11 may acquire deterioration information using an estimation model that estimates the degree of deterioration of the primary lining provided on the target structure. The control unit 11 may acquire the estimation model by reading it from the storage unit 12. The control unit 11 may receive the estimation model from an external server device via the communication unit 13.

[0029] The estimation model may be generated by any method. For example, the estimation model may be generated by dividing inspection information indicating the installation period of the inspected structure and the degree of deterioration of the structure's secondary lining into groups based on attributes of the underground environment, and then using any linear or nonlinear regression method on the data on the installation period and the degree of deterioration for each group. The installation period may be counted in any unit, such as years of installation, months, or days. An example of the attribute of the underground environment is the earth resistivity at the location where the structure is buried. The lower the earth resistivity, the greater the impact on the deterioration of the steel segments. This estimation model can accurately estimate the degree of deterioration of the secondary lining of the target structure at any time in the present or future, based on the attributes of the underground environment. The control unit 11 acquires underground environment information indicating the attributes of the underground environment of each of the multiple tunnels and selects an estimation model related to the attributes indicated by the information. The control unit 11 further acquires installation period information indicating the installation period of each of the multiple tunnels and inputs the installation period into the selected estimation model. The control unit 11 may read out the underground environment information and the installation period information from the storage unit 12, or may accept user input of the underground environment information and the installation period information via the input unit 14. The control unit 11 acquires, as deterioration information, the corrosion depth of the steel segment as the degree of deterioration estimated by the estimation model.

[0030] In step S102, the control unit 11 generates multiple structural models representing each of the multiple tunnels, reflecting the degree of deterioration indicated by the deterioration information. The control unit 11 acquires information indicating various parameters such as tunnel dimensions, and generates a structural model that reflects the parameters. The control unit 11 may read the information from the storage unit 12, or may accept user input of the information via the input unit 14. The control unit 11 generates a structural model with a thinner primary lining thickness as the degree of deterioration indicated by the deterioration information increases.

[0031] The control unit 11 may generate a structural model that reflects changes in corrosion depth estimated by the estimation model at predetermined time intervals. The predetermined time interval is, for example, one year, but is not limited to this. For example, the control unit 11 inputs, for one tunnel among the multiple tunnels, an installation period shifted by one year for 12 years from 2025 to 2037 into the estimation model. The control unit 11 may acquire deterioration information indicating first to twelfth corrosion depths, which are the corrosion depths of the primary lining for 12 years estimated by the estimation model, and generate, for each of the multiple tunnels, first to twelfth structural models that reflect the first to twelfth corrosion depths, respectively.

[0032] Figure 4 shows a structural model M of a tunnel generated by the control unit 11. A primary beam element B1 representing the primary lining and a secondary beam element B2 representing the secondary lining are connected to each other by a plurality of connecting spring elements SP that transmit the response of the primary lining and the secondary lining to loads in the structural analysis. In Figure 4, eight connecting spring elements SP are provided at equal intervals, but the number and positions of the connecting spring elements SP are not limited to this. The control unit 11 may generate a structural model M in which the distance L corresponding to the thickness of the primary lining is shorter as the degree of deterioration increases.

[0033] The control unit 11 may receive input of various parameters related to the steel segments and generate a structural model based on the various parameters. The parameters include, for example, values ​​indicating the shape, thickness, or number of any of the main girders, joint plates, longitudinal ribs, and skin plates provided in the steel segments. Fig. 5 shows the structure of one steel segment S. The steel segment S in Fig. 5 includes a main girder F, which is a load-bearing member, a skin plate PL for preventing the inflow of groundwater, etc., and multiple longitudinal ribs RB extending in the width direction of the steel segment S.

[0034] The control unit 11 may generate a structural model M including a plurality of primary beam elements B1 and a plurality of secondary beam elements B2 arranged along the axial direction of the tunnel. FIG. 6A shows a tunnel T without the primary lining, and FIG. 6B shows a structural model M of the tunnel T without the connecting spring elements SP. In the tunnel T of FIG. 6A, a plurality of segment rings R1 to R3, each consisting of steel segments connected continuously in the circumferential direction, are further connected in the axial direction. The segment rings R1 to R3 are connected to each other with a predetermined angle offset in the circumferential direction. The structural model M of FIG. 6B includes a primary beam element B11 and a secondary beam element B21 corresponding to the segment ring R1, a primary beam element B12 and a secondary beam element B22 corresponding to the segment ring R2, and a primary beam element B13 and a secondary beam element B23 corresponding to the segment ring R3, which are arranged along the axial direction of the tunnel.

[0035] 3, the control unit 11 performs a structural analysis on the generated structural model. Any structural analysis software may be used for the structural analysis. For example, MOLEMAN (registered trademark) may be used as the structural analysis software.

[0036] The control unit 11 sets various parameters for each of the multiple tunnels in accordance with the requirements of the structural analysis software. The parameters include physical properties such as material strength of each element of the structural model, and specifications of the underground environment in which the tunnel is installed. The specifications of the underground environment may include earth pressure, water pressure, or subgrade reaction. Specifically, the specifications of the underground environment may include the subgrade reaction coefficient, soil cover, unit volume weight of soil, unit volume weight of water, tunnel excavation radius, surcharge load, internal friction angle of soil, or soil cohesion. The control unit 11 may read the setting values ​​of each parameter from the memory unit 12, or may receive user input of the setting values ​​of each parameter via the input unit 14.

[0037] In the structural analysis, the control unit 11 may calculate, for example, a crack initiation bending moment at which cracks occur in the concrete of the secondary lining. To calculate the crack initiation bending moment, the control unit 11 first obtains the tensile strength of the concrete using the following equation 1. f' in equation 1 ｃｋ is the concrete strength (k / mm２ ) and may be set as a parameter. The control unit 11 calculates the section modulus of concrete per segment ring using the following formula 2. In formula 2, h represents the thickness (m) of the concrete, and b represents the width (m). For example, when the thickness h of the concrete is 0.2968 (m) and the width b is 0.9 (m), the section modulus Z is 0.01321 (m ３ The width b of the concrete may be the same as the width of the steel segment covering the concrete. The control unit 11 further calculates the concrete crack initiation bending moment per segment ring using the following equation 3: f ｔｋ = 0.23 × f' ｃｋ ２／３ (kN / m ２ ) (Formula 1) Z=b×h ２ / 6 (m ３ ) (Formula 2) M=f ｔｋ ・Z (kN・m) (Formula 3)

[0038] The control unit 11 sets the load to be applied to the structural model. The loads acting on the structural model include the weight of the primary lining, the weight of the secondary lining, a load from above or below in the vertical direction, and horizontal loads acting from multiple height positions in the vertical direction. The control unit 11 repeatedly calculates and evaluates whether the bending moment generated by the load transmitted from the primary lining to the secondary lining, which changes as corrosion of the primary lining progresses, exceeds the crack initiation bending moment. The control unit 11 calculates the point in time when the bending moment generated in the secondary lining exceeds the crack initiation bending moment.

[0039] The control unit 11 may perform structural analysis by sequentially applying loads to multiple structural models that reflect the change in corrosion depth over time estimated by the estimation model at predetermined time intervals. As the thickness of the primary lining decreases, the centroid distance in the cross section of the tunnel becomes shorter. The shorter the centroid distance, the greater the load transmitted from the primary lining to the secondary lining. As the load increases, the bending moment generated in the concrete secondary lining increases, approaching the crack initiation bending moment. According to the structural analysis of this embodiment, it is possible to calculate the point in time when the bending moment exceeds the crack initiation moment, taking into account various parameters of the tunnel and underground environment.

[0040] When the control unit 11 generates a structural model including a plurality of primary beam elements, secondary beam elements, and connection spring elements corresponding to a plurality of segment rings, the control unit 11 may perform a structural analysis for each of the segment rings.

[0041] The control unit 11 may perform structural analysis by taking into account not only the thinning of the skin plates of the steel segments serving as primary lining over time but also the reduction in the cross-sectional area of ​​the main girders of the steel segments. In this case, the structural model generated in S102 described above includes the cross-sectional areas of the skin plates and main girders as attribute values ​​of the primary beam elements. The control unit 11 sets a smaller cross-sectional area for the greater degree of deterioration of the primary lining. Specifically, the control unit 11 calculates the reduction in the cross-sectional area of ​​the skin plates over time using a value obtained by subtracting the corrosion depth calculated by the estimation model described above. The control unit 11 further acquires a predetermined main girder estimation model that estimates the reduction in the thickness of the main girders when the installation period is input, and calculates the reduction in the cross-sectional area of ​​the main girders over time using the reduction in the thickness of the main girders calculated by the main girder estimation model. The control unit 11 may read the main girder estimation model from the storage unit 12 or receive it from an external server device. The control unit 11 may perform structural analysis by applying a load to the structural model that reflects the reduction in the cross-sectional area at predetermined time intervals. This allows the control unit 11 to perform a structural analysis that reflects the deterioration of the main girder of the primary lining and the outer skin plate.

[0042] The control unit 11 may perform structural analysis by setting the model generated in step S102 to reflect forces acting from the underground environment. For example, the control unit 11 performs structural analysis after setting ground spring elements that connect the underground environment in which the tunnel is buried to the structural model. In this case, the control unit 11 may set the spring constant of the ground spring using any calculation formula based on the soil quality at the time of tunnel construction or the tunnel's own weight. The control unit 11 may set the spring constant of the ground spring to a value calculated from a predetermined conditional formula on the structural analysis software.

[0043] For example, the control unit 11 adds a rotational spring element representing at least one segment joint to the primary beam element to reflect the presence of the segment joint, and then performs structural analysis. The segment joint may be represented by, for example, a rotational spring element, and the control unit 11 may set a spring constant for the rotational spring element that changes over time. The control unit 11 may set the spring constant of the rotational spring element to a value calculated from a predetermined conditional expression in structural analysis software.

[0044] Figure 7A shows a cross-sectional view SD1 of the segment ring R1 of Figure 6A, and Figure 7B shows a cross-sectional view SD2 of the segment ring R2 of Figure 6A. Figure 7C shows a primary beam element B11 corresponding to the cross-sectional view SD1 of Figure 7A, and Figure 7D shows a primary beam element B12 corresponding to the cross-sectional view SD2 of Figure 7B. Secondary beam elements are omitted in Figures 7C and 7D. The primary beam element B11 of Figure 7C and the primary beam element B12 of Figure 7D include multiple segment joints SJ. The cross-sectional views SD1 of Figure 7A and SD2 of Figure 7B include a primary lining L1 and a secondary lining L2 divided at a predetermined angle, and each of the multiple fan-shaped sections that make up the divided primary lining L1 corresponds to a steel segment. The cross-sectional view SD2 shows that the segment rings R1 and R2 are tilted clockwise by about 10 degrees more than the cross-sectional view SD1, and are connected with a shift of about 10 degrees from each other, representing a staggered arrangement.

[0045] In addition to the primary and secondary beam elements, the control unit 11 may perform structural analysis using a ring joint model representing a ring joint connecting the segment rings. The ring joint may be represented by, for example, a shear spring element, and the control unit 11 may set the spring constant by treating the shear spring element as a rigid connection. The control unit 11 may set the spring constant of the shear spring element to a value determined from a predetermined conditional equation in the structural analysis software. Figure 8 shows a ring joint model RM that connects segment rings R1 and R2 in the axial direction of the tunnel. The ring joint model RM includes multiple ring joints RJ. The arc length, which is the distance between the ring joints RJ, may be, for example, the distance between the longitudinal ribs of the steel segments, which is the range where cracks are likely to occur.

[0046] When steel segments are connected circumferentially, the magnitude of the bending moment transmitted from adjacent steel segments at their cross sections varies depending on the spring constant of the rotational spring element representing the segment joint and the spring constant of the shear spring element representing the ring joint. By reflecting the segment joint in the primary beam element and performing structural analysis using a ring joint model, the magnitude of the bending moment can be calculated numerically, enabling more accurate analysis.

[0047] In step S104 of FIG. 3 , the control unit 11 acquires analysis information indicating the results of the structural analysis. The analysis information includes time information indicating the time until cracks occur in the secondary lining. Specifically, the control unit 11 acquires, as the analysis information, time information indicating the time until the bending moment generated in the secondary lining due to the applied load exceeds the crack initiation bending moment of the secondary lining as a result of the structural analysis. The time information may also be information indicating the time itself when the bending moment generated in the secondary lining exceeds the crack initiation bending moment, i.e., the time itself when cracks occur in the primary lining. For example, suppose the control unit 11 performs structural analysis sequentially, starting with the first structural model described above that reflects an increasing degree of deterioration of the primary lining, and the bending moment generated when structural analysis of the fifth structural model is performed exceeds the crack initiation bending moment. In this case, the control unit 11 acquires, as the analysis information, time information indicating May 2025, when the fifth corrosion depth reflected in the fifth structural model will be reached.

[0048] The analysis information may include an image showing the analysis results for the structural model. The image may include, for example, a deformation diagram, a bending moment diagram, a shear force diagram, an axial force diagram, or a diagram showing inter-ring shear forces. For example, the image included in the analysis information may be superimposed on at least one of the primary beam element B1 and the secondary beam element B2 for each segment ring to show the generated deformation or distribution of various forces.

[0049] In step S105 of Fig. 3, the control unit 11 outputs priority information indicating the order of inspection priority for multiple structures based on the time information included in the analysis information. Specifically, the control unit 11 outputs priority information, which arranges multiple tunnels in order of the earliest time until cracks appear in the primary lining, via the output unit 15. The control unit 11 may transmit the priority information to the user's terminal device via the communication unit 13. Thereafter, the operation of the information processing device 10 ends.

[0050] FIG. 9 is an example of priority information. Referring to FIG. 9 , tunnels are listed in descending order of the time it takes for cracks to develop. While the priority information in FIG. 9 is in table format, the format of the priority information is not limited to this. For example, the priority information may be displayed as an image on a map showing the locations of tunnels, highlighting tunnels with higher priorities using colors or symbols. A user who references the priority information can determine an inspection schedule to inspect a predetermined number of tunnels in descending order of priority indicated by the priority information, based on, for example, the number of workers available to perform inspection work or the number of days available for inspection work. This allows for more efficient tunnel inspections than when inspections are uniformly performed on all tunnels.

[0051] As a modification of the above-described embodiment, the control unit 11 may further acquire reinforcement information indicating reinforcement work performed on at least some of the structures among the plurality of structures, and may reflect the effects of the reinforcement work in the structural models representing at least some of the structures among the plurality of structural models based on the reinforcement information. Reinforcement work includes, for example, reinforcement or replacement of steel segments, which are the primary lining, or concrete, which is the secondary lining. The reinforcement information includes information indicating whether or not the reinforcement work has been performed.

[0052] Any method may be employed to acquire the reinforcement information. For example, the control unit 11 may accept user input of the reinforcement information via the input unit 14, or may read and acquire the reinforcement information from the storage unit 12. For example, assume that the reinforcement information indicates that a steel segment has been replaced in a certain tunnel. In this case, the control unit 11 may input 0 years as the installation age into the estimation model, reflect the estimated degree of deterioration, generate a structural model of the tunnel, and perform structural analysis. The control unit 11 may also perform structural analysis by reflecting the effects of the reinforcement work by resetting various parameters related to the tunnel that has undergone reinforcement work.

[0053] In this modification, the control unit 11 performs structural analysis of a tunnel that has undergone reinforcement work, reflecting the effects of the reinforcement work, and acquires time information. The control unit 11 then outputs new priority information based on the time information. Since it takes longer for cracks to appear in the secondary lining of a tunnel after reinforcement work has been performed, the priority information lowers the inspection priority for that tunnel. This allows the user to always keep track of the latest inspection priorities.

[0054] The following additional notes are provided regarding the above-described embodiments.

[0055] (Supplementary Item 1) An information processing device comprising: an information processing device that acquires a plurality of structural models representing a plurality of structures, each of which has a primary lining and a secondary lining provided inside the primary lining; performs structural analysis on each of the plurality of structural models to acquire time information indicating the time until cracks occur in the secondary lining; and outputs priority information indicating the plurality of structures in order of inspection priority based on the time information. (Supplementary Item 2) The information processing device according to Supplementary Item 1, wherein the plurality of structures includes a tunnel, and the tunnel has steel segments as the primary lining and a concrete material as the secondary lining. (Supplementary Item 3) The information processing device according to Supplementary Item 1 or 2, wherein the control unit acquires an estimation model that estimates the degree of deterioration of the primary lining of the target structure when an installation period of the target structure is input; and applies the estimation model to each of the plurality of structures to reflect the estimated degree of deterioration of the primary lining of each of the plurality of structures in the plurality of structural models. (Appendix 4) The information processing device described in any one of appendixes 1 to 3, wherein the control unit acquires reinforcement information indicating reinforcement work performed on at least some of the structures among the plurality of structures, and reflects the effects of the reinforcement work in a structural model representing at least some of the structures among the plurality of structural models based on the reinforcement information.

[0056] The present disclosure is not limited to the above-described embodiments. For example, two or more blocks shown in the block diagram may be integrated, or one block may be divided. Two or more steps shown in the flowchart may be executed in parallel or in a different order, instead of being executed in chronological order as described, depending on the processing capabilities of the device executing each step, or as needed. Other modifications are possible within the scope of the present disclosure.

[0057] REFERENCE SIGNS LIST 10 Information processing device 11 Control unit 12 Storage unit 13 Communication unit 14 Input unit 15 Output unit

Claims

1. An information processing device comprising: a control unit that acquires a plurality of structural models representing a plurality of structures, each of which comprises a primary lining and a secondary lining provided inside the primary lining; performs structural analysis on each of the plurality of structural models to acquire time information indicating the time until cracks occur in the secondary lining; and outputs priority information indicating the plurality of structures in order of inspection priority based on the time information.

2. The information processing device according to claim 1, wherein the plurality of structures includes a tunnel, and the tunnel comprises steel segments as the primary lining and a concrete material as the secondary lining.

3. An information processing device as described in claim 1 or 2, wherein the control unit, when the installation period of the target structure is input, obtains an estimation model for estimating the degree of deterioration of the primary lining of the target structure, applies the estimation model to each of the multiple structures, and reflects the estimated degree of deterioration of the primary lining of each of the multiple structures in the multiple structural models.

4. The information processing device described in claim 1 or 2, wherein the control unit acquires reinforcement information indicating reinforcement work performed on at least some of the structures among the plurality of structures, and reflects the effects of the reinforcement work in a structural model representing at least some of the structures among the plurality of structural models based on the reinforcement information.

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