RISK ASSESSMENT DEVICE, RISK ASSESSMENT METHOD, AND PROGRAM

Abstract

This risk evaluation method comprises a sensor information acquisition means that acquires sensor information for a structure from a sensor information acquisition device, a stratum information acquisition means that acquires stratum information for the ground under the structure, a risk evaluation means that evaluates risks to the structure on the basis of the sensor information and the stratum information, and an output means that outputs the evaluated risks to the structure.

Description

[Technical field]

[0001] The present disclosure relates to a risk assessment device, a risk assessment method, and a recording medium. [Background technology]

[0002] There is a technology that uses images captured by a drive recorder mounted on a vehicle to determine the condition of roads and runways. For example, Patent Document 1 discloses an in-vehicle device that performs image recognition processing on images captured by a camera or the like mounted on the vehicle, and detects abnormal conditions on the road, such as a collapse of the road or the occurrence of other disasters.

[0003] There is also a technology to determine the degree of deterioration according to the type of the surface of a structure. For example, Patent Document 2 discloses a pavement deterioration determination device that automatically determines the pavement type of a road from a captured road image and information on the shooting position, and automatically determines the degree of deterioration for each pavement type based on the road image, the information on the shooting position, and the pavement type determination result. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-049442 A [Patent Document 2] JP 2020-147961 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of large structures such as roads, bridges, and runways, when displacement of the ground (surface layer) occurs that affects the entire structure, deterioration of the surface such as cracks occurs. This surface deterioration occurs separately from displacement caused by deterioration of the structure itself, such as deterioration of surface components (individual deterioration). For this reason, the response to repairs, etc. for deterioration caused by ground displacement and individual deterioration are different.

[0006] There are various types of ground, and the progression of displacement such as land subsidence differs for each type, so the deterioration of structures on the ground also differs. Therefore, the method of determining deterioration differs depending on the type of ground. The pavement deterioration determination device described in Patent Document 2 determines the degree of deterioration based on the road pavement type, such as asphalt or concrete. However, even for roads with the same pavement, the ground structure differs greatly depending on the location, making it difficult to appropriately evaluate the deterioration of structures.

[0007] One example of an objective of the present disclosure is to provide a risk assessment device, etc. that is capable of performing appropriate risk assessment for structures. [Means for solving the problem]

[0008] A risk assessment device in one form of the present invention comprises a sensor information acquisition means for acquiring sensor information of a structure from a sensor information acquisition device, a stratum information acquisition means for acquiring stratum information of the ground beneath the structure, a risk assessment means for evaluating the risk to the structure based on the sensor information and the stratum information, and an output means for outputting the evaluated risk to the structure.

[0009] A risk assessment method in one form of the present invention acquires sensor information of a structure from a sensor information acquisition device, acquires geological layer information of the ground beneath the structure, evaluates the risk to the structure based on the sensor information and the geological layer information, and outputs the evaluated risk to the structure.

[0010] In one embodiment of the present invention, a recording medium records a program that causes a computer to acquire sensor information of a structure from a sensor information acquisition device, acquire stratum information of the ground beneath the structure, evaluate risk to the structure based on the sensor information and stratum information, and output the evaluated risk to the structure. Effect of the Invention

[0011] One example of the effect of the present disclosure is that it enables appropriate risk assessment of structures. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a block diagram illustrating an example of a configuration of a risk assessment device according to the first embodiment. [Diagram 2] FIG. 2 is a conceptual diagram showing an example of the configuration of the risk assessment device and its peripherals according to the first embodiment. [Diagram 3] FIG. 3 is a flow diagram illustrating an example of the operation of the risk assessment device according to the first embodiment. [Figure 4] FIG. 4 is a block diagram illustrating an example of a hardware configuration of the risk assessment apparatus according to the first embodiment. As illustrated in FIG. [Diagram 5] FIG. 5 is a block diagram illustrating an example of a configuration of a risk assessment device according to the second embodiment. As shown in FIG. [Figure 6] FIG. 6 is a flow diagram showing an example of the operation of the risk assessment device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Next, an embodiment of the present invention will be described with reference to the drawings. Each drawing is for explaining an embodiment of the present invention. However, the embodiment of the present invention is not limited to the description in each drawing. Also, the same numbers are given to similar configurations in each drawing, and repeated description thereof may be omitted. Also, in the drawings used in the following description, description of the configuration of the parts not related to the solution of the problem of the present invention may be omitted and not illustrated.

[0014] <First embodiment> FIG. 1 is a block diagram showing an example of the configuration of a risk assessment device 10 according to the first embodiment. The risk assessment device 10 includes a sensor information acquisition unit 101, a stratum information acquisition unit 102, a risk assessment unit 103, and an output unit 104. Each component may store at least a part of the information specified, acquired, and determined by each component in a storage unit (not shown). In this case, each component may acquire necessary information from the storage unit. The risk assessment device 10 is a device for evaluating the risk of deterioration of a structure, etc., based on sensor information acquired from a sensor information acquisition device and stratum information of the ground under the structure. Examples of the structure include civil engineering structures such as roads, bridges, scree frames, embankments, piers, revetments, and runways.

[0015] FIG. 2 is a conceptual diagram showing an example of the configuration of the risk assessment device 10 and its peripherals according to the first embodiment. As shown in FIG. 2, the risk assessment device 10 is used as a system including a computer 510, a drive recorder 520 as an example of a sensor information acquisition device, an SAR 530 as a synthetic aperture radar system (hereinafter referred to as SAR), a terminal device 540 as an example of a display device, and a vehicle 550 as an example of a moving body. However, in this embodiment, the SAR 530 is not an essential component. The network 580 is a communication path that connects each device and system to each other. Note that the risk assessment device 10 (computer 510) and the drive recorder 520 may be directly connected, or may be connected via a network or the like.

[0016] The drive recorder 520 outputs sensor information to the risk assessment device 10. The sensor information is information acquired from a sensor to determine the status of a structure and its surroundings. Examples of sensors include a camera, a speedometer, or an accelerometer. The drive recorder 520 is mounted on a moving body, for example, to acquire sensor information. Examples of moving bodies include vehicles and drones. In addition, instead of the drive recorder 520, the sensor information may be acquired using a fixed camera attached to the moving body, a camera brought to the moving body by a person, or a fixed camera installed on a road. In addition, instead of the drive recorder 520, a fixed camera such as a panoramic camera or a built-in camera attached to the moving body may be used. In addition, the sensor information may be acquired using a camera mounted on a smartphone or tablet brought to the moving body by a person, or a fixed camera installed on a road.

[0017] The SAR 530 is a radar system that transmits and receives radio waves while a flying object such as an artificial satellite or an aircraft is moving, and obtains images equivalent to those obtained by an antenna with a large aperture. The SAR 530 outputs a measurement image (SAR image) or a ground displacement to the risk assessment device 10.

[0018] The terminal device 540 displays the risk information for the structure output by the risk assessment device 10. The terminal device 540 may be any device that can display the risk information for the structure. The terminal device 540 may be, for example, a terminal device of a road administrator such as a local government.

[0019] The number of components included in FIG. 2 is an example. For example, the number of drive recorders 520 may be one or more. Alternatively, at least a part of drive recorders 520 may not be mounted on vehicle 550. Note that FIG. 2 shows drive recorder 520 outside vehicle 550 for ease of understanding. However, drive recorder 520 may be mounted inside vehicle 550.

[0020] Returning to FIG. 1, the sensor information acquisition unit 101 acquires sensor information of a structure from a sensor information acquisition device. The sensor information acquisition unit 101 acquires sensor information at any timing for acquiring sensor information. When acquiring image data as sensor information, the sensor information acquisition unit 101 acquires information on the date and time when the image data was acquired and the location where the image data was photographed together with the image data. The location information includes, for example, a location on a map, latitude and longitude, and location information by a Global Navigation Satellite System (GNSS) or a Global Positioning System (GPS). The sensor information acquisition unit 101 may acquire information at the time of sensor acquisition, such as brightness and darkness, the presence or absence of shadows, the presence or absence of backlight, or the surrounding weather, together with the sensor information.

[0021] The stratum information acquisition unit 102 acquires stratum information of the ground beneath the structure. The ground is the surface layer of the ground that supports the foundation of the structure. The stratum information acquisition unit 102 acquires stratum information of the ground on which the structure to be risk assessed exists, for example, from a public database.

[0022] Strata information includes information on developed land, surface strata, soil information, or topographical information. Developed land information is information on construction work carried out on land other than residential land to turn it into a residential area, etc. Developed land information includes, for example, existing embankments, belly-up embankments, valley filling, natural ground, non-embankments, and other fills. Surface strata are strata that have accumulated near the ground surface. Surface strata include geological names such as low-lying marsh deposits, natural levees, sandbar deposits, Iimuro Formation, Kakio Formation, Musashino Loam Formation, Musashino Gravel Formation, Obaradai Gravel Layer / Zengyo Gravel Layer, Shimosueyoshi Loam Layer / Shimosueyoshi Formation, Hayada Loam Formation, Maioka Loam Formation, Tsurumi Layer / Maioka Layer, or information indicating the strata age such as Middle / Late Pleistocene, Early Pleistocene, Socene, Late Pleistocene, Quaternary Period, etc. Soil information includes, for example, soil types such as immature sand dune soil, black soil, brown lowland soil, gray lowland soil, rubble soil, dark red soil, artificially altered soil, and artificially altered soil, as well as soil properties such as fine sand, coarse sand, silt, and clay. Note that stratum and soil that easily contain water, such as silt or clay, are often soft. Topography information includes natural topography such as loam (volcanic ash) plateaus, debris flow deposits, mountain slopes, old water areas, old river channels, declining lowlands, riverbeds and riverbeds, wetlands, current water areas, gravel areas, natural levees, valley lowlands, foothill debris surfaces and talus, and artificial topography such as artificial flatlands, cut land, reclaimed land, embankments, and gravel mining sites.

[0023] The stratum information may also include information related to land and soil other than the stratum. For example, the information may include (average) slope angle, steep slope designation, annual precipitation, rainwater infiltration basin, low land with poor drainage, landslide hazard area, liquefaction risk, shaking tendency, landslide hazard area, land use type, registered land use, etc. This information allows the softness of the ground to be understood. The land use types include high-rise buildings, low-rise buildings, low-rise building dense areas, public facilities, factories, exhibition halls, parking lots, parks and green spaces, forests, vacant lots, roads, railways, rivers, lakes and marshes, and coasts. The registered land uses include residential land, rice fields, farms, pastures, wilderness, salt fields, springs, ponds and marshes, forests, cemeteries, temple grounds, canal land, water supply land, wastewater channels, reservoirs, embankments, ditches, conservation forests, public roads, parks, railway land, school land, and miscellaneous land. For example, lowlands often found near rivers, ponds, and other water bodies are often soft.

[0024] The stratum information acquisition unit 102 may also acquire time-series information (stratum history) of the stratum as the stratum information. For example, the state of the soil before and after development in the developed land, past changes or movements of the river basin, plans for development and modification of the ground surface, development plans, improvement plans, development plans such as underground tunnel construction or plans for the construction of large buildings, and surrounding construction plans may be associated with the information. The ground that was once a river basin is often soft. The stratum information used by the risk assessment unit 103 may be one or more. The stratum information used by the risk assessment unit 103 may be fixed, or may be arbitrarily specified by the user.

[0025] The risk assessment unit 103 assesses the risk to the structure based on the sensor information and the geological layer information input from the sensor information acquisition unit 101 and the geological layer information acquisition unit 102, respectively. The risk assessment unit 103 identifies the deteriorated part of the structure using a trained model. This trained model is a model trained using sensor information such as an image of the structure and acceleration as teacher data, and outputs the presence or absence of deterioration of the structure for the sensor information. However, the method of identifying the deteriorated part by the risk assessment unit 103 is not limited to this. The risk assessment unit 103 may identify the deteriorated part without using the trained model. For example, the risk assessment unit 103 may identify the deteriorated part based on an edge or a line of the structure detected by image processing. In addition, the risk assessment unit 103 may convert the acceleration data into the International Roughness Index (IRI) described later by a predetermined method, and identify the deteriorated part using the IRI. The IRI is an index that associates the road surface with the driver's ride comfort, and is a numerical representation of the degree of roughness.

[0026] Next, the risk assessment unit 103 assesses the risk to the structure based on the stratum information of the ground under the structure where the deterioration is identified. The risk assessment is to assess the presence or absence of risk and the degree of risk based on factors that may cause deterioration of the structure. For example, a stratum containing soil that easily absorbs water, such as silt or clay, may expand due to freezing inside the stratum (frost heave), and cracks may occur on the surface of the structure. Therefore, when the stratum information includes a stratum that easily absorbs water, the risk assessment unit 103 assesses that there is a risk of cracking of the structure due to freezing. On the other hand, a stratum with little moisture or good drainage, such as a sand layer, a gravel layer, or a bedrock, is not easily affected by frost heave. In this case, the risk assessment unit 103 assesses that there is a low risk of deterioration of the structure due to frost heave. Furthermore, when a stratum that is easily deformed by heat or pressure is included, the risk assessment unit 103 assesses that there is a possibility that expansion and compression inside the stratum may affect cracking of the structure.

[0027] When the stratum information includes an embankment, the risk assessment unit 103 assesses that there is a risk of subsidence due to the embankment or the soft ground of the embankment. In other words, ground on which embankments are built in valleys or on slopes may subside due to the weight of the soil of the embankment itself. In addition, when construction waste materials such as glass are mixed into the soil on which embankments are built, the ground is soft and may subside. In this way, the risk assessment unit 103 assesses possible risks to structures according to the stratum information of the ground of the land on which embankments are built.

[0028] When assessing the risk, the risk assessment unit 103 may further use information on the environment of the structure acquired from a database. The database is, for example, a database in which meteorological data and traffic data are stored. The database may be a database created by a user or may be publicly available. The meteorological data is, for example, precipitation information and temperature information published on the website of the Japan Meteorological Agency or the like. The risk assessment unit 103 assesses, for example, that an area with heavy precipitation or an area with extremely low temperatures is at risk of deterioration due to precipitation or temperature. The risk assessment unit 103 assesses, for example, that roads and bridges with heavy traffic are at risk of deterioration due to traffic.

[0029] The output unit 104 outputs the risk to the structure evaluated by the risk evaluation unit 103. For example, when the risk evaluation unit 103 evaluates the risk of the structure, the output unit 104 notifies the terminal device 540 of the position of the structure and information indicating the risk determined by the risk evaluation unit 103. The output unit 104 may select the notification destination. The output unit 105 may output, for example, to the terminal device 540 of a road administrator such as a local government. The output unit 104 may superimpose the information indicating the risk on a map such as a road map, a hazard map, or a large-scale embankment construction site map. This map may be capable of selectively displaying the name of a city, town, village, road, railroad, river, or the like. The output unit 104 may also display information indicating a risk centered on a specific point (facility) on the map.

[0030] [Explanation of operation] 3 is a flow diagram showing an example of the operation of the risk assessment device 10 according to the first embodiment. The sensor information acquisition unit 101 acquires sensor information of the structure from the sensor information acquisition device (step S101). The stratum information acquisition unit 102 acquires stratum information of the ground below the structure (step S102). The risk assessment unit 103 evaluates the risk to the structure based on the sensor information and the stratum information (step S103). Next, the output unit 104 outputs the risk of the structure evaluated by the risk assessment unit 103 (step S104).

[0031] In the risk assessment device 10, the risk assessment unit 103 assesses the risk to the structure based on the sensor information and the geological layer information. This allows the risk to the structure to be assessed by taking into account not only the deterioration information of the structure surface from the sensor information, but also the geological layer information of the ground. Therefore, the risk assessment device 10 enables appropriate risk assessment of the structure.

[0032] [Hardware configuration] Next, the hardware configuration of the risk assessment device 10 will be described. Each component of the risk assessment device 10 may be configured with a hardware circuit. Alternatively, in the risk assessment device 10, each component may be configured using a plurality of devices connected via a network. For example, the risk assessment device 10 may be configured using cloud computing. Alternatively, in the risk assessment device 10, a plurality of components may be configured with a single piece of hardware. Alternatively, the risk assessment device 10 may be realized as a computer device including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The risk assessment device 10 may be realized as a computer device including a network interface circuit (NIC) in addition to the above configuration.

[0033] 4 is a block diagram showing an example of a hardware configuration of the risk assessment device 10. The risk assessment device 10 includes a CPU 610, a ROM 620, a RAM 630, a storage device 640, and a NIC 650, and constitutes a computer device. The CPU 610 reads a program from the ROM 620 and / or the storage device 640. The CPU 610 then controls the RAM 630, the storage device 640, and the NIC 650 based on the read program. The computer including the CPU 610 then controls these configurations and realizes the functions of the sensor information acquisition unit 101, the geological layer information acquisition unit 102, the risk assessment unit 103, and the output unit 104 shown in FIG. 1.

[0034] When implementing each function, the CPU 610 may use the RAM 630 or the storage device 640 as a temporary storage medium for programs and data. Alternatively, the CPU 610 may read, using a storage medium reading device (not shown), a program contained in a storage medium 690 that stores a program in a computer-readable manner. Alternatively, the CPU 610 may receive a program from an external device (not shown) via the NIC 650, store the program in the RAM 630 or the storage device 640, and operate based on the stored program.

[0035] The ROM 620 stores programs and fixed data executed by the CPU 610. The ROM 620 is, for example, a P-ROM (Programmable-ROM) or a flash ROM. The RAM 630 temporarily stores programs and data executed by the CPU 610. The RAM 630 is, for example, a D-RAM (Dynamic-RAM). The storage device 640 stores data and programs that the risk assessment device 10 stores for a long period of time. The storage device 640 may also operate as a temporary storage device for the CPU 610. The storage device 640 is, for example, a hard disk device, a magneto-optical disk device, a solid state drive (SSD), or a disk array device. The ROM 620 and the storage device 640 are non-volatile (non-transitory) recording media. On the other hand, the RAM 630 is a volatile (transitory) recording media. The CPU 610 can operate based on the programs stored in the ROM 620, the storage device 640, or the RAM 630. That is, the CPU 610 can operate using a non-volatile recording medium or a volatile recording medium.

[0036] The NIC 650 relays data exchange with external devices (such as the drive recorder 520, the SAR 530, the terminal device 540, and the vehicle 550) via the network. The NIC 650 is, for example, a LAN (Local Area Network) card. Furthermore, the NIC 650 is not limited to being wired, and may be wireless.

[0037] <Modification of the first embodiment> In the modified example of the first embodiment, the description will be given mainly assuming that the structure is a road. In the first embodiment, the risk assessment unit 103 identifies the deteriorated part of the structure using a trained model, image processing, IRI, or the like. However, the risk assessment unit 103 may identify the deteriorated part of the road and the progress of the deterioration based on an index indicating the degree of road deterioration. In this case, the risk assessment unit 103 evaluates the risk to the structure by taking into account information on the progress of the deterioration of the structure.

[0038] Here, the indices representing the degree of each road deterioration will be described. There are multiple types of road deterioration. Road deterioration is classified into multiple types including, for example, cracks, potholes, rutting, and abnormalities in road flatness. Cracks may be classified into different types, such as linear cracks and tortoiseshell cracks, depending on the shape. A linear crack is a single linear crack. A tortoiseshell crack is a tortoiseshell-shaped crack that occurs when, for example, vertical and horizontal linear cracks are connected. Cracks on roads generally tend to progress in the order of linear cracks, tortoiseshell cracks, and potholes.

[0039] The crack degree is expressed by any one of the shape, length, area, and number of cracks, or a combination of these. The crack rate is an example of the crack degree. The crack rate is expressed, for example, by 100 x (crack area / road section area). In this case, the deterioration degree value ranges from 0% to 100%. The crack area is calculated by any method. Note that the method of calculating the crack rate is not particularly limited, and other known calculation methods can be applied in addition to the above.

[0040] The size of a pothole is expressed, for example, by the area, width, length, or depth of the pothole, or a combination of these. The amount of rutting is the depth of a continuous depression in the direction of the road that occurs at the position where the wheels of a vehicle pass (rut portion) due to traffic load.

[0041] The degree of cracking, the number and size of potholes, and the amount of rutting may be calculated based on measurement data obtained by measuring the road surface with a sensor, or these indices may be calculated based on the recognition results of road deterioration recognized from images of the road.

[0042] The flatness may be represented by the IRI. The IRI may be calculated based on measurement data obtained by measuring the road surface with a sensor. Alternatively, the IRI may be calculated based on the value of an acceleration sensor attached to the vehicle while the vehicle is traveling. Specifically, for example, the IRI is calculated based on the value of the vertical acceleration included in the acceleration acquired at the detection position. Note that the method of calculating the IRI is not limited to the above, and any known calculation method may be adopted.

[0043] The deterioration degree is not limited to the above-mentioned indexes, and any index representing road deterioration including, for example, MCI (Maintenance Control Index) may be used. The MCI value is the minimum value of the results of calculating four definition equations using crack rate, rutting amount, and flatness. The MCI decreases with the deterioration of the road. If the structure is a runway, BBI (Boeing Bump Index), which is an index representing flatness, may be used.

[0044] In the modification of the first embodiment described above, the risk assessment unit 103 assesses the risk to the structure by taking into account information on the progress of deterioration of the structure, thereby making it possible to assess the magnitude of the risk to the structure.

[0045] <Second embodiment> Next, a second embodiment of the present disclosure will be described in detail with reference to the drawings. Below, the description of the second embodiment will be omitted unless the description is unclear.

[0046] 5 is a block diagram showing an example of the configuration of a risk assessment device 11 according to the second embodiment. The risk assessment device 11 includes a sensor information acquisition unit 111, a stratum information acquisition unit 112, a ground surface displacement acquisition unit 113, a risk assessment unit 114, a proposal unit 115, and an output unit 116. The second embodiment differs from the first embodiment in that the second embodiment includes the ground surface displacement acquisition unit 113 and the proposal unit 115. The configurations of the sensor information acquisition unit 111 and the stratum information acquisition unit 112 are similar to the corresponding configurations in the first embodiment, and therefore description thereof will be omitted.

[0047] The ground surface displacement acquisition unit 113 acquires the ground surface displacement using the measurement image acquired from the ground surface measurement device. Specifically, the ground surface displacement acquisition unit 113 acquires the SAR image captured by the SAR 530, and acquires the ground surface displacement by analyzing the acquired SAR image. Alternatively, the ground surface displacement acquisition unit 113 may directly acquire the ground surface displacement acquired by analyzing the SAR image captured by the SAR 530. The ground surface displacement may include information on the ground surface state such as ground subsidence / uplift, construction / removal of buildings, etc. The ground surface displacement acquisition unit 113 may acquire the observation result using a multispectrum from the SAR 530. In this case, the ground surface displacement acquisition unit 113 can analyze the type of the ground surface in addition to the ground surface displacement using the acquired measurement image. The type of the ground surface includes at least one of water surface, mud, garbage, dry soil, grassland, forest, farmland, and snow cover. The ground surface displacement acquisition unit 113 may use the displacement of a building or other structure. Furthermore, the ground surface displacement acquisition unit 113 may acquire the ground surface displacement using SAR images stored in a cloud system configured using cloud computing to which the drive recorder 520 is connected. The ground surface displacement acquisition unit 113 outputs the acquired ground surface displacement to the risk assessment unit 114.

[0048] The risk assessment unit 114 assesses the risk to the structure based on the sensor information, the stratum information, and the surface displacement. The risk assessment unit 114 assesses the risk to the structure by taking into account the surface displacement in addition to the risk assessment function of the risk assessment unit 103. For example, the risk assessment unit 114 assesses that the risk to the structure is higher as the surface displacement is larger than the predicted value. The risk assessment unit 114 may assess that the risk is high for a surface that is displaced rapidly and that moves nonlinearly even if the surface displacement is not larger than the predicted value. Here, the predicted value is, for example, a surface displacement predicted based on the structure and the stratum information. The risk assessment unit 114 may also assess the risk to the structure by taking into account the possibility of a disaster occurring near the structure based on the surface displacement. The risk assessment unit 114 outputs the acquired assessed risk to the proposal unit 115.

[0049] The proposal unit 115 proposes a policy for dealing with risks to the structure. The proposal unit 115 proposes a policy for repairing or repairing the deterioration of the structure based on the risk. The proposal unit 115 refers to examples of response policies previously stored in a database or the like, and outputs examples with similar risks, stratum information at that point, and surface displacement. For example, if the ground is soft, repairing only the surface of the structure without effective measures may cause subsidence and cause the structure to deteriorate again. Therefore, in this case, the proposal unit 115 proposes construction work to reinforce the soft ground under the structure. In addition, if there is a possibility that the ground will liquefy, the proposal unit 115 proposes a liquefaction countermeasure construction method such as compacting the ground. In addition, the ground that has been filled in a valley or on a slope may subside due to the weight of the fill. In this case, the proposal unit 115 proposes construction work to build a retaining wall or the like. Furthermore, if the soil on which the embankment is built contains construction waste such as glass, the ground is weak. Therefore, the proposal unit 115 proposes construction work to reinforce the ground. As another example, if the ground under a structure contains soil that easily absorbs moisture, the proposal unit 115 proposes a policy of replacing the soil with soil that has good drainage. However, examples of response policies by the proposal unit 115 are not limited to this.

[0050] The output unit 116 outputs the risk to the structure as well as a response policy to a predetermined notification destination. For example, when the suggestion unit 115 proposes a response policy for the risk, the output unit 116 notifies the predetermined notification destination of the information indicating the risk to the structure determined by the risk assessment unit 114 and the response policy. The output unit 116 may select the notification destination. The output unit 116 may output to, for example, a terminal device 540 of a road administrator such as a local government.

[0051] [Explanation of operation] FIG. 6 is a flow diagram showing an example of the operation of the risk assessment device 11 according to the second embodiment. Steps S201 to S202 in this embodiment are similar to steps S101 to S102 in the first embodiment, and therefore will not be described. The ground surface displacement acquisition unit 113 acquires ground surface displacement using a measurement image acquired from a ground surface measurement device (step S203). Next, the risk assessment unit 114 evaluates the risk to the structure based on the sensor information, the stratum information, and the ground surface displacement (step S204). Next, the proposal unit 115 proposes a response policy for the risk evaluated by the risk assessment unit 114 (step S205). Finally, the output unit 116 outputs the response policy proposed by the proposal unit 115 in addition to the risk to the structure evaluated by the risk assessment unit 114 (step S206).

[0052] In the risk assessment device 11 according to the second embodiment, the risk assessment unit 114 assesses the risk to the structure based on the surface displacement in addition to the sensor information and the geological layer information. This makes it possible to assess the magnitude of the risk by using information including the magnitude of the surface displacement in the risk assessment. Therefore, the risk to the structure can be assessed with higher accuracy. Furthermore, in the risk assessment device 11, the proposal unit 115 proposes a risk response policy. This allows the person in charge of managing the structure to begin risk response by referring to the response policy.

[0053] Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above-mentioned embodiments. Various modifications that can be understood by a person skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. For example, the proposal unit 115 proposed a response policy for a risk to a structure evaluated based on sensor information, geological layer information, and ground surface displacement. However, the proposal unit 115 may propose a response policy for a risk to a structure evaluated based only on sensor information and geological layer information. That is, the risk assessment device 10 according to the first embodiment may have a configuration equivalent to the proposal unit 115.

[0054] A part or all of the above-described embodiments can be described as, but is not limited to, the following supplementary notes.

[0055] (Appendix 1) a sensor information acquisition means for acquiring sensor information of a structure from a sensor information acquisition device; A stratum information acquisition means for acquiring stratum information of the ground beneath the structure; a risk assessment means for assessing a risk to the structure based on the sensor information and the geological layer information; an output means for outputting the evaluated risk to the structure; A risk assessment device comprising:

[0056] (Appendix 2) A ground surface displacement acquisition means for acquiring a ground surface displacement using a measurement image acquired from the ground surface measurement device, The risk assessment means assesses a risk to the structure based on the sensor information, the geological layer information, and the ground surface displacement. 2. A risk assessment apparatus as described in appended claim 1.

[0057] (Appendix 3) The risk assessment means assesses the risk to the structure by further using information on the environment of the structure obtained from a database. 10. The risk assessment device according to claim 1 or 2.

[0058] (Appendix 4) The risk assessment means acquires meteorological information from the database and assesses the risk to the structure. The risk assessment device according to appendix 3

[0059] (Appendix 5) When the stratum information includes a stratum that is prone to contain water, The risk assessment means assesses that there is a risk of cracking due to freezing. 5. A risk assessment device according to any one of claims 1 to 4.

[0060] (Appendix 6) When the stratum information includes fill, The risk assessment means assesses that there is a risk of land subsidence due to embankment or soft ground of the embankment. 5. A risk assessment device according to any one of claims 1 to 4.

[0061] (Appendix 7) A proposal means for proposing a policy for dealing with the evaluated risk to the structure, 7. The risk assessment device according to any one of claims 1 to 6, wherein the output means outputs the risk to the structure and the response policy.

[0062] (Appendix 8) The sensor information is image data obtained by photographing a structure on which a mobile object travels. 8. A risk assessment device according to any one of appendices 1 to 7.

[0063] (Appendix 9) The structure is a road. 9. A risk assessment apparatus as described in claim 8.

[0064] (Appendix 10) Acquire sensor information from a sensor information acquisition device; Obtain information on the strata of the ground beneath the structure, assessing a risk to the structure based on the sensor information and the geological formation information; Outputting the evaluated risk to the structure How to assess the situation.

[0065] (Appendix 11) Acquire sensor information from a sensor information acquisition device; Obtain information on the strata of the ground beneath the structure, assessing a risk to the structure based on the sensor information and the geological formation information; outputting the assessed risk to the structure; A recording medium for recording a program that causes a computer to execute the above. [Explanation of symbols]

[0066] 10, 11 Risk assessment device 101, 111 Sensor information acquisition unit 102, 112 Geological information acquisition department 103, 114 Risk Assessment Section 104, 116 Output section 113 Surface Displacement Acquisition Unit 115 Proposal Department 510 Computer 520 Drive Recorder 530 SAR 540 Terminal Equipment 550 vehicles 580 Network 610 CPU 620 ROM 630 RAM 640 Storage device 650NIC

Claims

1. a sensor information acquisition means for acquiring sensor information of a structure from a sensor information acquisition device; A layer information acquisition means for acquiring layer information of the ground beneath the structure; a ground surface displacement acquisition means for acquiring a ground surface displacement using a measurement image acquired from the ground surface measurement device; a risk assessment means for assessing a risk to the structure based on the sensor information, the geological layer information, and the ground surface displacement; an output means for outputting the evaluated risk to the structure; A risk assessment device comprising:

2. The risk assessment means assesses the risk to the structure by further using information on the environment of the structure obtained from a database. The risk assessment device according to claim 1 .

3. The risk assessment means acquires meteorological information from the database and assesses the risk to the structure. The risk assessment device according to claim 2 .

4. When the stratum information includes a stratum that is prone to contain water, The risk assessment means assesses that there is a risk of cracking due to frost heave. The risk assessment device according to any one of claims 1 to 3.

5. When the stratum information includes fill, The risk assessment means assesses that there is a risk of land subsidence due to embankment or soft ground of the embankment. The risk assessment device according to any one of claims 1 to 3.

6. A proposal means for proposing a policy for dealing with the evaluated risk to the structure, 6. The risk assessment device according to claim 1, wherein the output means outputs the risk to the structure and the response policy.

7. The sensor information is image data obtained by photographing a structure on which a mobile object travels. The risk assessment device according to any one of claims 1 to 6.

8. A computer comprising: Acquire sensor information of the structure from a sensor information acquisition device; Acquire stratum information of the ground beneath the structure; Obtaining ground surface displacement using the measurement image obtained from the ground surface measurement device; assessing a risk to the structure based on the sensor information, the geological layer information, and the ground surface displacement; Outputting the evaluated risk to the structure Risk assessment methods.

9. Acquire sensor information of the structure from a sensor information acquisition device; Acquire stratum information of the ground beneath the structure; Obtaining ground surface displacement using the measurement image obtained from the ground surface measurement device; assessing a risk to the structure based on the sensor information, the geological layer information, and the ground surface displacement; outputting the assessed risk to the structure; A program that causes a computer to execute the following.

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