Corrosivity evaluation device and corrosivity evaluation method

Abstract

To improve a method for evaluating corrosiveness of an underground structure.SOLUTION: A corrosive evaluation device 20 which evaluates corrosiveness of an underground structure comprises: an information acquisition portion 211 which acquires ground corrosiveness information indicating parameters affecting corrosiveness in an aboveground region of the underground structure, rainfall amount information indicating a rainfall amount in the aboveground region, land use information indicating a land use status of the aboveground region, underground corrosiveness information indicating corrosiveness of soil within a predetermined range from the underground structure, and inspection information indicating an inspection status of the underground structure; and an evaluation portion 212 which evaluates the corrosiveness of the underground structure based on an aboveground corrosiveness evaluation that is a result of evaluating corrosiveness of the underground structure due to inflow materials from a ground based on the ground corrosiveness information, the rainfall amount information, the land use information, and the inspection information, and an underground corrosiveness evaluation that is a result of evaluating corrosiveness of the underground structure due to inflow materials from an underground based on the underground corrosiveness information and the inspection information.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a corrosivity evaluation device and a corrosivity evaluation method. [Background technology]

[0002] Conventionally, there are techniques for predicting the corrosivity of underground structures that are mainly based on the corrosivity of soil. For example, the evaluation index of ANSI (American National Standard Institute) predicts the corrosivity of soil from resistivity and pH value, etc. (Non-Patent Document 1). In addition, a technique for predicting the corrosion rate of buried steel materials from soil particle size and soil moisture content has been studied, and it has been found that the corrosion rate increases at a certain moisture content (Non-Patent Document 2). On the other hand, for above-ground structures, multiple studies have revealed that the corrosivity of steel structures changes depending on the atmospheric environment (Non-Patent Documents 3 and 4). It has also been suggested that the corrosion of the inner surface of underground pipelines and the corrosion of metal fittings are affected by the water quality accumulated inside (Non-Patent Document 5). [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Yukio Katano and two others, "Corrosion and corrosion prevention of buried pipes", URBAN KUBOTA, No. 23, pp. 52-56, [online], [Retrieved November 12, 2021], Internet<URL:https: / / www.kubota.co.jp / siryou / pr / urban / pdf / 23 / pdf / 23_3.pdf> [Non-Patent Document 2] Shota Ohki and 4 others, "Effect of soil particle size and soil moisture content on the corrosion rate of buried steel," Materials and Environment, Vol. 67, pp. 118-120, 2018, [online], [Retrieved November 12, 2021], Internet<URL:https: / / www.jstage.jst.go.jp / article / jcorr / 67 / 3 / 67_118 / _pdf / -char / ja> [Non-Patent Document 3] Takashi Sawada and 3 others, "Research on corrosion protection technology for telecommunications structures and equipment," NTT Technical Journal, November 2010, pp. 32-36, [online], [Retrieved November 12, 2021], Internet<URL:https: / / www.ntt.co.jp / journal / 1011 / files / jn201011032.pdf> [Non-Patent Document 4] Hideki Katayama, "Building a foundation for corrosion mapping using corrosion test data," [online], [Retrieved November 12, 2021], Internet<URL:https: / / www.nims.go.jp / SIP-infrastructure / pdf / 05_katayama.pdf> [Non-Patent Document 5] Akira Ito, Koji Tanaka & Hiroyuki Saito, “Electrochemical measurement to examine influence of ions, DO, and pH on corrosion of early-generation conduits”, Corrosion Engineering, Science and Technology, 53:sup1, 16-20, 2018, DOI: 10.1080 / 1478422X.2018.1425602 Summary of the Invention [Problem to be solved by the invention]

[0004] However, there was no technology to comprehensively evaluate the corrosivity of underground structures using data on corrosivity above and below ground, and there was room for improvement in methods for evaluating the corrosivity of underground structures.

[0005] In consideration of the above circumstances, the object of the present invention is to provide technology that enables comprehensive evaluation of the corrosivity of underground structures using data on corrosivity above and below ground, and to improve methods for evaluating the corrosivity of underground structures. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the corrosivity evaluation device of the present invention is a corrosivity evaluation device that evaluates the corrosivity of an underground structure, and is equipped with an information acquisition unit that acquires ground corrosivity information indicating parameters that affect the corrosivity in the above-ground area of ​​the underground structure, precipitation information indicating the precipitation in the above-ground area, land use information indicating the land use status of the above-ground area, underground corrosivity information indicating the corrosivity of soil within a predetermined range from the underground structure, and inspection information indicating the inspection status of the underground structure, and an evaluation unit that evaluates the corrosivity of the underground structure based on a ground corrosivity evaluation that is the result of evaluating the corrosivity of the underground structure due to inflow from above ground based on the ground corrosivity information, the precipitation information, the land use information, and the inspection information, and an underground corrosivity evaluation that is the result of evaluating the corrosivity of the underground structure due to inflow from underground based on the underground corrosivity information and the inspection information.

[0007] In addition, the corrosivity evaluation method of the present invention is a corrosivity evaluation method executed by a corrosivity evaluation device for an underground structure, and includes an information acquisition step of acquiring ground corrosivity information indicating parameters that affect the corrosivity in the above-ground area of ​​the underground structure, precipitation information indicating the precipitation in the above-ground area, land use information indicating the land use status of the above-ground area, underground corrosivity information indicating the corrosivity of soil within a predetermined range from the underground structure, and inspection information indicating the inspection status of the underground structure, and an evaluation step of evaluating the corrosivity of the underground structure based on a ground corrosivity evaluation which is the result of evaluating the corrosivity of the underground structure due to inflow from above ground based on the ground corrosivity information, the precipitation information, the land use information, and the inspection information, and an underground corrosivity evaluation which is the result of evaluating the corrosivity of the underground structure due to inflow from underground based on the underground corrosivity information and the inspection information. Effect of the Invention

[0008] According to the present invention, a technology is provided that enables comprehensive evaluation of the corrosivity of underground structures using data on corrosivity above and below ground, thereby improving methods for evaluating the corrosivity of underground structures. [Brief description of the drawings]

[0009] [Figure 1] 1 is a diagram showing an overview of a system according to an embodiment of the present invention; [Diagram 2] 1 is a block diagram showing a schematic configuration of a corrosivity evaluation device according to an embodiment of the present disclosure. FIG. [Diagram 3] This is a diagram to explain an example of an underground structure located across multiple soil layers, in which there are multiple paths for inflow from above ground and underground. [Figure 4A] FIG. 2 is a diagram showing the operation of the corrosivity evaluation device according to an embodiment of the present disclosure. [Figure 4B] FIG. 2 is a diagram showing the operation of the corrosivity evaluation device according to an embodiment of the present disclosure. [Diagram 5] FIG. 13 is a diagram showing an outline of a system according to a modified example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings as appropriate. In the following description, "upper" and "lower" refer to a direction parallel to the Z axis of the coordinate axis display depicted in the drawing, and "horizontal" refers to a direction parallel to the XY plane of the coordinate axis display depicted in the drawing. In each drawing, the same or corresponding parts are given the same reference numerals. In the description of the present embodiment, the description of the same or corresponding parts will be omitted or simplified as appropriate. The embodiment described below is an example of the configuration of the present disclosure, and the present disclosure is not limited to the following embodiment.

[0011] <System 1 Configuration> An overview of a system 1 according to an embodiment of the present disclosure will be described with reference to Fig. 1. The system 1 includes a first measurement probe 10A, a second measurement probe 10B, and a corrosivity evaluation device 20. The first measurement probe 10A, the second measurement probe 10B, and the corrosivity evaluation device 20 are communicatively connected to a network 30 including, for example, the Internet and a mobile communication network. Hereinafter, when there is no particular distinction between the first measurement probe 10A and the second measurement probe 10B, they will be collectively referred to simply as the measurement probe 10.

[0012] The first measurement probe 10A is provided on the ground surface above an underground structure. In this embodiment, the "underground structure" is a communication manhole M, but is not limited to this, and includes any structure buried underground, such as an underground pipe or a cable tunnel. The second measurement probe 10B is provided around the manhole M or an underground pipe P connected to the manhole M. The first measurement probe 10A and the second measurement probe 10B can detect any parameter used in evaluating corrosiveness. The number of each of the first measurement probes 10A and the second measurement probes 10B provided in the system 1 may be determined arbitrarily.

[0013] The measurement probe 10 includes a communication unit and can communicate with an external device via the communication unit. The measurement probe 10 can measure the corrosion rate of metal in soil using a polarization resistance method. The first measurement probe 10A and the second measurement probe 10B may detect the water content and water quality in soil, or the temperature and humidity at the installation location. The measurement of the corrosion rate using the polarization resistance method and the configuration of the measurement probe 10 are described in the following Reference 1 and are known, so detailed description will be omitted. The measurement probe 10 can transmit the measurement result to the corrosivity evaluation device 20. (Reference 1) Yoshikazu Miyata et al., "Soil corrosion measurement mainly using electrochemical methods (part 2)," Zairyo-to-Kanhyo, Vol. 46, pp.610-619, 1997

[0014] The corrosivity evaluation device 20 is a computer such as a server belonging to a cloud computing system or other computing system. The corrosivity evaluation device 20 is capable of communicating with the first measurement probe 10A and the second measurement probe 10B via the network 30.

[0015] The network 30 includes the Internet, at least one Wide Area Network (WAN), at least one Metropolitan Area Network (MAN), or any combination thereof. The network 30 may include at least one wireless network, at least one optical network, or any combination thereof. The wireless network may be, for example, an ad-hoc network, a cellular network, a wireless local area network (LAN), a satellite communication network, or a terrestrial microwave network.

[0016] First, an overview of this embodiment will be described, and details will be described later. The corrosivity evaluation device 20 acquires ground corrosivity information indicating parameters that affect the corrosivity in the ground area of ​​the underground structure, precipitation information indicating the precipitation in the ground area, land use information indicating the land use status of the ground area, underground corrosivity information indicating the corrosivity of soil within a predetermined range from the underground structure, and inspection information indicating the inspection status of the underground structure. The corrosivity evaluation device 20 evaluates the corrosivity of the underground structure based on a ground corrosivity evaluation that is a result of evaluating the corrosivity of the underground structure due to inflow from the ground based on the ground corrosivity information, precipitation information, land use information, and inspection information, and a subsurface corrosivity evaluation that is a result of evaluating the corrosivity of the underground structure due to inflow from the underground based on the subsurface corrosivity information and the inspection information.

[0017] The "area above ground" of an underground structure is an area including the ground surface through which water flowing into the underground structure passes and the air above the underground structure, and is an area within a predetermined range from the underground structure. The dashed line in FIG. 1 shows an example of the range of the area above ground. The "surface corrosivity information" includes any parameter related to the area above ground that affects the degree of corrosion of the underground structure. Specifically, it may include the amount of salt drift in the air above the underground structure, the temperature, the humidity, the amount of water passing through the ground surface, the corrosion rate of the soil on the ground surface, the moisture content, the grain size, the material of the member of the connection part of the underground structure to the ground, and the like. The connection part to the ground may include the neck and the cover of the manhole M in this embodiment. The ground corrosivity information may include the results measured by the first measurement probe 10A, as described below.

[0018] "Precipitation information" is the amount of precipitation on a land area for a given period of time. The amount of precipitation may be annual precipitation, monthly precipitation, etc. "Land use information" indicates the land use status of a land area by classifying it into any type. The any type may include, for example, urban, rural, forest, etc.

[0019] The "subsurface corrosivity information" includes any parameter related to the soil within a predetermined range of the underground structure that affects the degree of corrosion of the underground structure. The subsurface corrosivity information may include the corrosion rate, moisture content, particle size, and ANSI corrosivity rating score of the soil within the range. The subsurface corrosivity information may include results measured by the second measurement probe 10B, as described below.

[0020] The "inspection information" may include a plurality of parameters that are the results of inspecting an underground structure in advance for any item. As described below, the inspection information is arbitrarily selected according to the type of underground structure to be evaluated for corrosivity. The inspection information of the manhole M may include parameters such as the amount of water flowing at the connection point between the ground and the manhole M, the presence or absence of deterioration of the neck of the manhole M and the cover of the manhole M, the presence or absence of deterioration of the inner wall of the manhole M, the amount of stagnant water in the manhole M, the water quality of the stagnant water in the manhole M, and the history of changes in humidity or temperature in the manhole M. The inspection information of the pipeline P may include parameters such as the presence or absence of deterioration of the inside or outside between the main body of the pipeline P and the joint of the pipeline P, the amount of stagnant water in the pipeline P, and the water quality of the stagnant water in the pipeline P.

[0021] The aboveground corrosivity information, the underground corrosivity information, the precipitation information, the land use information, and the inspection information may be acquired from an external device. When there are parameters that cannot be acquired from the aboveground corrosivity information, the underground corrosivity information, the precipitation information, the land use information, and the inspection information, the corrosivity evaluation device 20 may perform the corrosivity evaluation described below using substitute values ​​such as average values.

[0022] Referring to FIG. 1, the inflow from above ground to a manhole M as an underground structure is indicated by a solid arrow, and the inflow from underground is indicated by white arrows A, B, and C. An "inflow" is any gas, liquid, solid, or any combination thereof that affects the corrosivity of an underground structure. The corrosivity evaluation device 20 evaluates the corrosivity of the inflow indicated by the solid arrow based on above ground corrosivity information, precipitation information, land use information, and inspection information. At this time, the inspection information includes parameters related to the evaluation of the corrosivity of the inflow from above ground, including, for example, the presence or absence of deterioration of the neck of the manhole M and the cover of the manhole M.

[0023] The white arrow A in FIG. 1 indicates an inflow from the soil within a predetermined range of the manhole M into the manhole M. The white arrow B indicates an inflow that seeps from the soil around the pipeline P connected to the manhole M into the pipeline P and invades the manhole M through the pipeline P. The white arrow C indicates an inflow from another manhole N connected to the manhole M through the pipeline P into the manhole M via the pipeline P. Referring to FIG. 1, the elevation of the other manhole N is higher than the elevation of the manhole M. The corrosivity evaluation device 20 evaluates the corrosivity of the inflow indicated by the white arrow based on the underground corrosivity information and the inspection information. At this time, the inspection information includes parameters related to the evaluation of the corrosivity of the inflow from underground, including, for example, the presence or absence of deterioration of the inner wall of the manhole M, and the presence or absence of internal or external deterioration between the main body of the pipeline P of the pipeline P connected to the manhole M and the joint of the pipeline P.

[0024] In this way, according to the present embodiment, it is possible to evaluate the corrosivity of underground structures using parameters related to aboveground corrosivity and underground corrosivity. This makes it possible to predict the corrosion state inside underground structures that was unknown until inspection, and makes it possible to improve the efficiency of inspection and maintenance of underground structures. Therefore, it is possible to improve the method of evaluating the corrosivity of underground structures.

[0025] <Corrosivity evaluation device 20>

[0026] The configuration of the corrosiveness evaluation device 20 according to this embodiment will be described with reference to Fig. 2. The corrosiveness evaluation device 20 includes a control unit 21, a storage unit 22, a communication unit 23, an input unit 24, and an output unit 25. The control unit 21 includes an information acquisition unit 211 and an evaluation unit 212.

[0027] The control unit 21 is realized by a control and arithmetic circuit (controller). The control and arithmetic circuit may be configured by dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array), or may be configured by a processor, or may be configured to include both. The processor may be, for example, a general-purpose processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), or a dedicated processor specialized for a specific process, but is not limited to these. The control unit 21 executes processes related to the operation of the corrosiveness evaluation device 20 while controlling each part of the corrosiveness evaluation device 20. The control unit 21 can transmit and receive information to and from external devices via the communication unit 23 and the network 30.

[0028] The storage unit 22 includes one or more memories. The memories are, for example, but not limited to, semiconductor memories, magnetic memories, or optical memories. Each memory included in the storage unit 22 may function as, for example, a main storage device, an auxiliary storage device, or a cache memory. The storage unit 22 stores any information used in the operation of the corrosivity evaluation device 20. The information stored in the storage unit 22 may be updatable, for example, with information acquired from the network 30 via the communication unit 23. The storage unit 22 does not necessarily need to be provided inside the corrosivity evaluation device 20, and may be configured to be provided outside the corrosivity evaluation device 20.

[0029] The communication unit 23 includes one or more communication interfaces connected to the network 30. The communication interfaces correspond to, for example, a mobile communication standard, a wired LAN standard, or a wireless LAN standard, but are not limited to these, and may correspond to any communication standard. The communication unit 23 receives information used in the operation of the corrosiveness evaluation device 20, and transmits information obtained by the operation of the corrosiveness evaluation device 20. In this embodiment, the corrosiveness evaluation device 20 communicates with the measurement probe 10 via the communication unit 23 and the network 30.

[0030] The input unit 24 includes at least one input interface. The input interface is, for example, a physical key, a capacitance key, a pointing device, a touch screen integrally provided with a display, or a microphone. The input unit 24 accepts an operation to input data used for the operation of the corrosivity evaluation device 20. The input unit 24 may be connected to the corrosivity evaluation device 20 as an external input device instead of being provided in the corrosivity evaluation device 20. As a connection method, any method such as USB (Universal Serial Bus), HDMI (High-Definition Multimedia Interface) (registered trademark), or Bluetooth (registered trademark) can be used.

[0031] The output unit 25 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 Luminescence) display. The output unit 25 outputs data obtained by the operation of the corrosivity evaluation device 20. The output unit 25 may be connected to the corrosivity evaluation device 20 as an external output device instead of being provided in the corrosivity evaluation device 20. As a connection method, any method such as USB, HDMI (registered trademark), or Bluetooth (registered trademark) can be used.

[0032] The information acquisition unit 211 of the control unit 21 acquires position information indicating the position of an underground structure that is a target of the corrosiveness evaluation. In this embodiment, the underground structure is a manhole M. The position information includes three-dimensional coordinates of the latitude, longitude, and altitude of the manhole M. Any method may be adopted to acquire the position information. For example, a database indicating the position information of multiple underground structures may be stored in advance in the storage unit 22, and the information acquisition unit 211 may search the database and acquire the position information of the target underground structure. In this embodiment, it is assumed that the information acquisition unit 211 reads out latitude X1, longitude Y1, and altitude Z1 as the position information of the manhole M.

[0033] The evaluation unit 212 of the control unit 21 judges whether the elevation of another underground structure different from the underground structure to be evaluated for corrosivity is higher than that of the underground structure to be evaluated. The other underground structure may be an underground structure that exists within a predetermined distance from the underground structure to be evaluated for corrosivity. There may be a plurality of other underground structures. The evaluation unit 212 may make the judgment by referring to any database that records the position information of a plurality of underground structures, which is stored in advance in the storage unit 22. When the evaluation unit 212 judges that the elevation of the other underground structure is higher than that of the underground structure to be evaluated, it prioritizes the evaluation of the corrosivity of the other underground structure. When the evaluation unit 212 judges that the elevations of all the other underground structures are lower than that of the underground structure to be evaluated, that is, when it judges that the underground structure to be evaluated is located at the highest elevation, the evaluation unit 212 evaluates the corrosivity of the underground structure to be evaluated as follows.

[0034] In this embodiment, the evaluation unit 212 assumes that the elevation Z1 of the manhole M is higher than the elevation of another manhole N that exists within a predetermined distance from the manhole M. In this case, the evaluation unit 212 performs the following corrosiveness evaluation for the manhole M. When the elevation of the other underground structure is higher than the elevation Z1 of the manhole M, the evaluation unit 212 prioritizes the evaluation of the corrosiveness of the other underground structure.

[0035] The information acquisition unit 211 acquires the inspection information. Any method may be adopted for acquiring the inspection information. For example, a database that accumulates the inspection information for a plurality of underground structures may be stored in advance in the storage unit 22, and the information acquisition unit 211 may search the database to acquire specific inspection information. The database may be an inspection result that the information acquisition unit 211 has received from a terminal device used by an inspection worker and accumulated as the inspection information. The present invention is not limited to this, and for example, the information acquisition unit 211 may communicate with a server installed in a maintenance and management company of the underground structure, and acquire the inspection information from the server.

[0036] The information acquisition unit 211 can acquire inspection information according to the type of underground structure to be evaluated for corrosivity. For example, when the underground structure to be evaluated for corrosivity is a manhole M, the information acquisition unit 211 acquires inspection information of the manhole M and inspection information of a pipeline P connected to the manhole M. All or a part of the inspection information is used for the above-ground corrosivity evaluation and the underground corrosivity evaluation described below. When the underground structure to be evaluated for corrosivity is a pipeline P, the information acquisition unit 211 may acquire inspection information of the pipeline P and inspection information of a manhole connected to the pipeline P. The manhole connected to the pipeline P may include at least one of the manhole M and the manhole N in FIG. 1. This makes it possible to perform the following corrosivity evaluation in consideration of the fact that the internal environment of the pipeline P changes due to the inflow from the manhole into the pipeline P.

[0037] The information acquisition unit 211 converts the inspection information into a coefficient. The greater the influence of the parameter of the inspection information on the corrosion of the manhole M, the higher the coefficient value that the information acquisition unit 211 converts into. Table 1 below shows an example of converting the parameter of the water flow rate at the connection point between the ground and the manhole M, which is included in the inspection information, into a coefficient. As shown in Table 1 below, the information acquisition unit 211 converts the parameter of the water flow rate at the connection point between the ground and the manhole M, which is included in the inspection information, into a coefficient. c1 If the water flow rate is "large", the coefficient i c3 The thresholds for dividing the parameters of the score information, and the aboveground corrosiveness information, underground corrosiveness information, precipitation information, and land use information described below into arbitrary categories such as "small," "medium," and "large" may be freely set.

[0038] [Table 1]

[0039] In the above Table 1, the water flow rate is assumed to be "medium" in this embodiment. c2 The information acquisition unit 211 stores the converted coefficient in the storage unit 22. c2is used in the above-ground corrosivity assessment described below.

[0040] Table 2 below shows an example of converting the parameter of the amount of water retained in the manhole M for a predetermined period, which is included in the inspection information, into a coefficient. As shown in Table 2 below, if the amount of retained water is less than XX, the information acquisition unit 211 converts the coefficient i s1 If the amount of retained water is within the range of a specified value XX or more but less than XY, the coefficient i s2 If it is greater than or equal to the specified value XY, the coefficient i s3 "Less than XX" corresponds to a state in which the amount of retained water is zero or extremely small.

[0041] [Table 2]

[0042] In the above Table 2, in this embodiment, the amount of retained water is in the range of a predetermined value XX or more and less than XY. s2 The information acquisition unit 211 stores the acquired coefficient in the storage unit 22. s2 is used in the subsurface corrosivity assessment described below.

[0043] As for other parameters of the inspection information regarding the manhole M, the information acquiring unit 211 converts, for example, the greater the degree of deterioration of the neck of the manhole M and the cover of the manhole M and the degree of deterioration of the inner wall of the manhole M into a higher coefficient. For example, the information acquiring unit 211 converts, for example, the greater the degree of influence on the corrosion of the manhole M due to the water quality of the stagnant water in the manhole M or the change in humidity or temperature inside the manhole M into a higher coefficient.

[0044] In this embodiment, the information acquisition unit 211 reads out inspection information for the manhole M as well as inspection information for the pipeline P connected to the manhole M. The information acquisition unit 211 converts a parameter of the inspection information into a coefficient with a higher value the greater the degree of influence the parameter has on the corrosion of the manhole M. Table 3 below shows an example of converting a parameter of the degree of deterioration of the main body of the pipeline P connected to the manhole M or the joint of the pipeline P, which is included in the inspection information, into a coefficient. As shown in Table 3 below, the information acquisition unit 211 converts a parameter of the degree of deterioration of the main body of the pipeline P or the joint of the pipeline P into a coefficient with a lower value. t1 If the degree of deterioration is "large", the coefficient i t3 Convert to.

[0045] [Table 3]

[0046] In the above Table 3, in this embodiment, the degree of deterioration of the main body of the pipeline P or the joint of the pipeline P is "medium". t2 The information acquisition unit 211 stores the converted coefficient in the storage unit 22. t2 is used in the subsurface corrosivity assessment described below.

[0047] For example, the information acquiring unit 211 converts the coefficient into a higher value as the amount of stagnant water in the pipeline P increases or as the impact of the water quality of the stagnant water in the pipeline P on the corrosion of the pipeline P or the manhole M increases.

[0048] The information acquisition unit 211 may convert the parameters of the above-mentioned inspection information, and the above-ground corrosivity information, underground corrosivity information, precipitation information, and land use information described below, into scores instead of coefficients.

[0049] The information acquisition unit 211 acquires ground corrosivity information. Any method may be adopted for acquiring the ground corrosivity information. For example, a database in which various parameters of the ground corrosivity information are accumulated in association with coordinate positions on a map is pre-stored in the storage unit 22. The information acquisition unit 211 may refer to the database and acquire various parameters in a certain area from the coordinates indicated by the position information of the underground structure as ground corrosivity information. Without being limited thereto, the information acquisition unit 211 may communicate with a server installed in an external measurement agency and acquire various parameters of an area corresponding to the position of the underground structure from the server as ground corrosivity information.

[0050] First, the information acquisition unit 211 converts each parameter included in the ground corrosivity information into a coefficient with a higher value as the degree of influence on the corrosion of the manhole M by the parameter increases. The parameters may include the amount of salt drift in the air above the manhole M, the temperature, the humidity, the amount of water flowing on the ground surface, the corrosion rate, moisture content, grain size, and material of the member of the connection part of the manhole M with the ground.

[0051] In this embodiment, the information acquisition unit 211 converts the amount of salt flying in the air above the manhole M into a coefficient CX, and the air temperature in the air above the manhole M into a coefficient CY.

[0052] The information acquiring unit 211 communicates with the first measurement probe 10A via the communication unit 23, and acquires the result of measuring the corrosion rate of the soil on the ground surface by the first measurement probe 10A as ground corrosivity information. The information acquiring unit 211 converts the corrosion rate measured by the first measurement probe 10A to a higher coefficient value as the corrosion rate measured by the first measurement probe 10A increases. In this embodiment, the information acquiring unit 211 converts the corrosion rate measured by the first measurement probe 10A to a coefficient CZ.

[0053] Next, the information acquisition unit 211 determines the degree of ground corrosivity as "small", "medium", or "large" according to the result of integrating the coefficients of each parameter, and further converts it into a coefficient of underground corrosivity information. The threshold value of the coefficient for dividing the degree of ground corrosivity into any category such as "small", "medium", and "large" may be freely set. In this embodiment, the degree of ground corrosivity is determined according to the value obtained by multiplying the coefficient of each parameter of the ground corrosivity information. This is not limited to this, and any method may be adopted as the method by which the information acquisition unit 211 determines the degree of ground corrosivity from each parameter. For example, the information acquisition unit 211 may weight any parameter to determine the degree of ground corrosivity.

[0054] The information acquisition unit 211 further converts the determined degree of ground corrosivity into a coefficient. In this embodiment, the greater the value of the result of multiplying the coefficients of each parameter, the greater the value of the ground corrosivity coefficient is converted into. Table 4 below shows an example of converting ground corrosivity information into a coefficient. As shown in Table 4, the information acquisition unit 211 converts the ground corrosivity information into a coefficient into a small value if the ground corrosivity is "low". a1 If the surface corrosivity is "high", the coefficient c is large. a2 Convert to.

[0055] [Table 4]

[0056] In this embodiment, it is assumed that the information acquisition unit 211 determines the level of ground corrosivity to be "medium" based on the value obtained by multiplying the coefficients CX, CY, and CZ. The information acquisition unit 211 converts this into the value of c in accordance with Table 4 above. a2 The information acquisition unit 211 stores the converted coefficient in the storage unit 22. a2 is used in the above-ground corrosivity assessment described below.

[0057] The information acquisition unit 211 acquires precipitation information. Any method may be used to acquire the precipitation information. For example, a database that accumulates information indicating precipitation in various places may be stored in advance in the storage unit 22, and the information acquisition unit 211 may read out the precipitation in the area corresponding to the position of the underground structure and acquire it as precipitation information. Without being limited to this, for example, the information acquisition unit 211 may communicate with a server installed in an external meteorological observation facility and acquire the precipitation in the area corresponding to the position of the underground structure from the server as precipitation information.

[0058] The information acquisition unit 211 converts the precipitation information into a coefficient. The information acquisition unit 211 converts the precipitation information into a coefficient with a higher value as the degree of influence of the precipitation on the corrosion of the manhole M becomes greater. For example, the information acquisition unit 211 may convert the precipitation information into a coefficient with a higher value as the precipitation amount becomes greater.

[0059] Table 5 below shows an example of converting the annual precipitation indicated by the precipitation information into a coefficient. As shown in Table 5, the information acquisition unit 211 converts the precipitation to the lowest coefficient r1 if the precipitation is less than a predetermined value MM mm / y and less than MN mm / y, converts it to coefficient r2 if the precipitation is within the range of the predetermined value MM mm / y or more and less than MN mm / y, and converts it to coefficient r3 if the precipitation is the predetermined value MN mm / y or more.

[0060] [Table 5]

[0061] In the present embodiment, in Table 5, the amount of precipitation is within a range of a predetermined value of MM mm / s or more and less than MN mm / s. The information acquisition unit 211 converts this into a coefficient of r2. The information acquisition unit 211 stores the converted coefficient in the storage unit 22. The coefficient r2 is used in the above-ground corrosivity evaluation described below.

[0062] The information acquisition unit 211 acquires land use information. Any method may be adopted for acquiring the land use information. For example, a database that accumulates information showing land use status in various places may be stored in advance in the storage unit 22, and the information acquisition unit 211 may acquire the land use status of the area corresponding to the position of the underground structure as the land use information. Without being limited thereto, for example, the information acquisition unit 211 may communicate with a server installed in an external land management institution and acquire the land use status of the area corresponding to the position of the underground structure from the server as the land use information.

[0063] The information acquisition unit 211 converts the land use information into a coefficient. The greater the influence of the land use situation on the corrosion of manhole M, the higher the coefficient value that the information acquisition unit 211 converts into. Table 6 below shows an example of converting the land use situation indicated by the land use information into a coefficient. As shown in Table 6, the information acquisition unit 211 converts the land use situation indicated by the land use information into a coefficient g1 with a small value if the land use situation is "urban", and converts the land use situation indicated by the land use information into a coefficient g3 with a large value if the land use situation is "mountain forest".

[0064] [Table 6]

[0065] In the present embodiment, the land use status is assumed to be "rural" in Table 6 above. The information acquisition unit 211 converts this to a coefficient of g2. The information acquisition unit 211 stores the converted coefficient in the storage unit 22. The coefficient g2 is used in the above-ground corrosivity evaluation described below.

[0066] The information acquisition unit 211 acquires underground corrosivity information. Any method may be adopted for acquiring underground corrosivity information. For example, a database in which various parameters of underground corrosivity information are accumulated in association with coordinate positions on a map is pre-stored in the storage unit 22. The information acquisition unit 211 may refer to the database and acquire various parameters in a certain area from the coordinates indicated by the position information of the underground structure as underground corrosivity information. Without being limited thereto, the information acquisition unit 211 may communicate with a server installed in an external measurement agency and acquire various parameters of an area corresponding to the position of the underground structure from the server as underground corrosivity information.

[0067] First, the information acquisition unit 211 converts each parameter included in the underground corrosiveness information into a coefficient with a higher value as the degree of influence on the corrosion of the manhole M by the parameter becomes greater. Each parameter relates to soil within a predetermined range from the underground structure. The parameters may include, for example, the corrosion rate, moisture content, particle size, and ANSI corrosiveness evaluation score of the soil. The ANSI corrosiveness evaluation score is known as described in Non-Patent Document 1, and therefore will not be described here. The relationship between the corrosion rate and moisture content described in Non-Patent Document 2 may be used as the parameter.

[0068] The information acquiring unit 211 communicates with the second measuring probe 10B via the communication unit 23, and acquires the result of measuring the corrosion rate of the soil in an area within a predetermined range from the underground structure by the second measuring probe 10B as underground corrosivity information. The information acquiring unit 211 converts the corrosion rate measured by the second measuring probe 10B to a higher coefficient value as the corrosion rate measured by the second measuring probe 10B increases. In this embodiment, the information acquiring unit 211 converts the corrosion rate measured by the second measuring probe 10B to a coefficient DX. The information acquiring unit 211 may convert any parameter of the aboveground corrosivity information into a coefficient, not limited to the corrosion rate.

[0069] The information acquisition unit 211 determines the degree of underground corrosivity as "small", "medium", or "large" depending on the result of integrating the coefficients of each parameter, and further converts it into a coefficient of underground corrosivity information. The integration may be performed in the same manner as for the above-ground corrosivity information. The following Table 7 shows an example of converting underground corrosivity information into a coefficient. As shown in Table 7, the information acquisition unit 211 converts if the underground corrosivity is "small" into a small coefficient s1, and if the above-ground corrosivity is "large", into a large coefficient s3.

[0070] [Table 7]

[0071] In this embodiment, it is assumed that the information acquisition unit 211 determines the degree of underground corrosivity to be "medium" based on the coefficient DX. The information acquisition unit 211 converts this to a coefficient of s2 according to Table 7 above. The information acquisition unit 211 stores the converted coefficient in the storage unit 22. The coefficient s2 is used in the underground corrosivity evaluation described below.

[0072] The evaluation unit 212 reads out the values ​​of the coefficients obtained by converting the inspection information, ground corrosiveness information, precipitation information, and land use information by the information acquisition unit 211 from the storage unit 22. In this embodiment, the control unit 21 converts the coefficients i c2 , coefficient c of ground corrosive information a2 The evaluation unit 212 reads out y as a ground corrosivity evaluation using the following formula 1. o Calculate ^. Note that the symbol ^ in A^ refers to the symbol placed above A.

number

[0073] The above-ground corrosivity evaluation is a result of evaluating the corrosivity of the manhole M due to inflow of material from above ground into the manhole M. The evaluation unit 212 calculates the above-ground corrosivity evaluation y o ^ is stored in the memory unit 22.

[0074] Ground Corrosivity Rating o The method of calculating ^ is not limited to the above formula 1. When the information acquisition unit 211 converts the parameters of the inspection information, ground corrosivity information, precipitation information, and land use information into scores, the evaluation unit 212 calculates the sum of the scores to obtain the ground corrosivity evaluation y o ^ may be calculated.

[0075] The evaluation unit 212 reads out the values ​​of the coefficients into which the information acquisition unit 211 converted the inspection information and the underground corrosiveness information as described above from the storage unit 22. In this embodiment, the evaluation unit 212 reads out the coefficients i s2 and i t2 , and the coefficient s2 of the underground corrosiveness information. The evaluation unit 212 calculates the underground corrosiveness evaluation y u Calculate ^.

number

[0076] The underground corrosiveness evaluation is a result of evaluating the corrosiveness of the manhole M due to inflow from underground of the manhole M. The evaluation unit 212 calculates the underground corrosiveness evaluation y u ^ is stored in the memory unit 22.

[0077] Underground Corrosivity Assessment u The method of calculating ^ is not limited to the above formula 2. When the information acquisition unit 211 converts the parameters of the inspection information and the underground corrosiveness information into scores, the evaluation unit 212 calculates the underground corrosiveness evaluation y by adding up the scores. u ^ may be calculated.

[0078] The evaluation unit 212 receives the ground corrosivity evaluation y o ^ and underground corrosivity rating y u ^ and the corrosivity y^ of the underground structure is calculated using the following equation 3.

number

[0079] The method of calculating the corrosivity y^ of an underground structure is not limited to Equation 3. For example, if there is another underground structure adjacent to the underground structure, the evaluation unit 212 may calculate the corrosivity y next ^ may be calculated and added to the above equation 3 to calculate the corrosivity y^ of the underground structure.

[0080] For example, the evaluation unit 212 may calculate the corrosivity y^ of the underground structure by integrating a plurality of aboveground corrosivity evaluations and underground corrosivity evaluations. FIG. 3 shows an example in which a manhole M is located across two types of soil G1 and soil G2, and there are a plurality of paths for inflow from aboveground and underground. In FIG. 3, the black arrows D and E indicate inflow from aboveground to the manhole M as an underground structure. The white arrows F and G indicate inflow entering the manhole M from the soil within a predetermined range of the manhole M. In this case, the evaluation unit 212 separates the aboveground corrosivity evaluation and the underground corrosivity evaluation and calculates them for each path. For example, when the evaluation unit 212 calculates the aboveground corrosivity evaluation y^ of the underground structure in soil G1, o1 ^ and underground corrosivity rating y u1 ^ and above-ground corrosivity evaluation of underground structures in soil G2 y o2 ^ and underground corrosivity rating y u2 In this case, the evaluation unit 212 calculates the corrosivity y^ of the underground structure by the following formula 4.

number

[0081] In this embodiment, the process of the corrosivity evaluation device 20 can move to the process of evaluating the underground structure at the next highest altitude after the evaluation of the target underground structure is completed. In this case, the evaluation unit 212 may evaluate the corrosivity of the target underground structure by taking into account the presence of other underground structures different from the underground structure to be evaluated for corrosivity, i.e., the underground structure whose corrosivity was evaluated last time. For example, the evaluation unit 212 may calculate the corrosivity by weighting the number of underground structures having a higher altitude than the underground structure to be evaluated. In this case, the evaluation unit 212 may calculate the corrosivity y^ of the underground structure by multiplying the value calculated by the above formula 3 or 4 with a value of 1.1 as a weight. For example, the evaluation unit 212 may calculate the corrosivity y^ of the underground structure to be evaluated by adding the corrosivity value calculated for the other underground structure to the value calculated by the above formula 3 or 4 for the underground structure to be evaluated.

[0082] The evaluation unit 212 stores the calculated corrosivity y^ of the underground structure in the storage unit 22. The control unit 21 can display the corrosivity y^ to the user via the input unit 24 in response to an instruction from the user.

[0083] <Program> A computer capable of executing program instructions can be used to function as the above-described corrosivity evaluation device 20. Here, the computer may be a general-purpose computer, a dedicated computer, a workstation, a PC (Personal Computer), an electronic notepad, etc. The program instructions may be program code, code segments, etc. for performing the necessary tasks.

[0084] The computer includes a processor, a storage unit, an input unit, an output unit, and a communication interface. The processor may be a CPU, an MPU (Micro Processing Unit), a GPU, a DSP (Digital Signal Processor), a SoC (System on a Chip), or the like, and may be composed of multiple processors of the same type or different types. The processor reads a program from the storage unit and executes it to control each of the above components and perform various arithmetic processing. At least a part of the processing contents may be realized by hardware. The input unit is an input interface that receives a user's input operation and acquires information based on the user's operation, and is a pointing device, a keyboard, a mouse, or the like. The output unit is an output interface that outputs information, and is a display, a speaker, or the like. The communication interface is an interface for communicating with an external device.

[0085] The program may be recorded in a computer-readable recording medium. By using such a recording medium, the program can be installed in the computer. Here, the recording medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, and may be, for example, a CD-ROM, a DVD-ROM, a USB memory, or the like. In addition, the program may be in a form that is downloaded from an external device via a network.

[0086] <Operation of the corrosivity evaluation device 20> Next, the operation of the corrosivity evaluation device 20 according to the present embodiment will be described with reference to Fig. 4A and Fig. 4B. This operation corresponds to the corrosivity evaluation method according to the present embodiment. In the present embodiment, the underground structure is a manhole M.

[0087] In step S1, the information acquisition unit 211 of the control unit 21 acquires location information indicating the location of the underground structure to be evaluated for corrosiveness. Any method may be used to acquire the location information. In this embodiment, the information acquisition unit 211 searches a database indicating the location information of multiple underground structures stored in the storage unit 22, and reads out and acquires the latitude X1, longitude Y1, and altitude Z1 as the location information of the manhole M.

[0088] In step S2, the evaluation unit 212 judges whether the elevation of another underground structure different from the underground structure to be evaluated for corrosiveness is higher than that of the underground structure to be evaluated. The other underground structure may be an underground structure that exists within a predetermined distance from the underground structure to be evaluated for corrosiveness. In this embodiment, the evaluation unit 212 makes this judgment by referring to an arbitrary database that records the position information of multiple underground structures, which is stored in advance in the storage unit 22. If the elevation of the other underground structure is higher than that of the underground structure to be evaluated, the evaluation unit 212 prioritizes the evaluation of the corrosiveness of the other underground structure. Specifically, the processing from step S1 onward is repeated for the other underground structure. If the elevation of the other underground structure is lower than that of the underground structure to be evaluated, that is, if the underground structure to be evaluated is located at the highest elevation, the processing of the evaluation unit 212 proceeds to step S3.

[0089] In this embodiment, it is assumed that the evaluation unit 212 has determined that the elevations of all the other underground structures are lower than the elevation Z1 of the manhole M. The processing of the evaluation unit 212 proceeds to step S3. In this manner, when the elevations of the other underground structures different from the underground structure are higher than the elevation of the underground structure, the evaluation unit 212 preferentially evaluates the corrosivity of the other underground structures.

[0090] In step S3, the information acquisition unit 211 of the control unit 21 acquires inspection information indicating the inspection status of the underground structure. Any method may be adopted to acquire the inspection information. In this embodiment, the information acquisition unit 211 searches a database indicating the inspection information of multiple underground structures stored in the memory unit 22, and reads and acquires the inspection information of the manhole M.

[0091] The information acquisition unit 211 can acquire inspection information according to the type of underground structure to be evaluated for corrosivity. In this embodiment, the information acquisition unit 211 acquires parameters of the amount of water flowing at the connection point between the ground and the manhole M and the amount of water retained in the manhole M for a predetermined period as the inspection information of the manhole M to be evaluated for corrosivity, and acquires parameters of the degree of deterioration of the main body of the pipeline P or the joint of the pipeline P as the inspection information of the pipeline P connected to the manhole M.

[0092] In step S4, the information acquisition unit 211 converts the inspection information into a coefficient. The information acquisition unit 211 converts the inspection information into a coefficient with a higher value as the parameter of the inspection information has a greater effect on the corrosion of the manhole M. In this embodiment, the parameter of the water flow rate in Table 1 above is assumed to be "medium." The information acquisition unit 211 converts this into a coefficient i c2 In addition, for the parameter of the amount of water retained in the manhole M for a predetermined period in Table 2 above, it is assumed that the amount of retained water is within a range of a predetermined value XX or more and less than XY. The information acquisition unit 211 converts this into a coefficient i s2 In addition, it is assumed that the degree of deterioration of the main body of the pipe P or the joint of the pipe P in Table 3 is "medium." The information acquisition unit 211 converts this into a coefficient i t2 The information acquisition unit 211 stores the converted coefficient in the storage unit 22.

[0093] In step S5, the information acquisition unit 211 acquires ground corrosivity information. Any method may be used to acquire the ground corrosivity information. In this embodiment, the information acquisition unit 211 refers to a database that stores various parameters included in the ground corrosivity information in association with coordinate positions on a map, which is stored in the memory unit 22, and reads and acquires the ground corrosivity information of the manhole M. The information acquisition unit 211 further communicates with the measurement probe 10A via the communication unit 23, and acquires the result of measuring the corrosion rate of the soil on the ground surface by the measurement probe 10A as ground corrosivity information.

[0094] In step S6, the information acquisition unit 211 converts each parameter of the ground corrosivity information into a coefficient. The information acquisition unit 211 converts the parameter of the ground corrosivity information into a coefficient with a higher value as the parameter has a greater influence on the corrosion of the manhole M.

[0095] In this embodiment, the amount of salt flying above the manhole M is converted to a coefficient CX, and the air temperature above the manhole M is converted to a coefficient CY. The information acquiring unit 211 converts the corrosion rate measured by the measurement probe 10A to a coefficient CZ. The information acquiring unit 211 stores the converted coefficient in the memory unit 22.

[0096] In step S7, the information acquisition unit 211 determines the degree of ground corrosivity as "small", "medium", or "large" according to the value resulting from integrating the coefficients of each parameter of the ground corrosivity information. In this embodiment, the information acquisition unit 211 determines the degree of ground corrosivity as "medium" as a result of multiplying the coefficients CX, CY, and CZ.

[0097] In step S8, the information acquisition unit 211 further converts the determined level of ground corrosivity into a coefficient. In this embodiment, the information acquisition unit 211 converts the level of ground corrosivity "medium" into a coefficient according to Table 4 above. a2 The information acquisition unit 211 stores the converted coefficient in the storage unit 22.

[0098] In step S9, the information acquisition unit 211 acquires precipitation information. Any method may be used to acquire the precipitation information. In this embodiment, the information acquisition unit 211 searches a database that accumulates information indicating precipitation in various places stored in the storage unit 22, reads out the precipitation in the area corresponding to the position of the underground structure, and acquires it as precipitation information.

[0099] In step S10, the information acquisition unit 211 converts the precipitation information into a coefficient. The greater the influence of the parameter of the precipitation information on the corrosion of the manhole M, the higher the coefficient value that the information acquisition unit 211 converts into. In this embodiment, the precipitation is within a range of a predetermined value of MM mm / to less than MN mm / , and the information acquisition unit 211 converts this into a coefficient of r2 according to Table 5 above. The information acquisition unit 211 stores the converted coefficient in the storage unit 22.

[0100] In step S11, the information acquisition unit 211 acquires land use information. Any method may be adopted to acquire the land use information. In this embodiment, the information acquisition unit 211 searches a database that accumulates information indicating the land use status of each area stored in the storage unit 22, reads out the land use status of the area corresponding to the position of the underground structure, and acquires it as the land use information.

[0101] In step S12, the information acquisition unit 211 converts the land use information into a coefficient. The greater the impact of a parameter of the land use information on the corrosion of the manhole M, the higher the coefficient value that the information acquisition unit 211 converts into. In this embodiment, the land use situation is "rural", and the information acquisition unit 211 converts this into a coefficient of g2 according to Table 6 above. The information acquisition unit 211 stores the converted coefficient in the storage unit 22.

[0102] In step S13, the information acquisition unit 211 acquires underground corrosivity information. Any method may be adopted for acquiring the underground corrosivity information. In this embodiment, the information acquisition unit 211 refers to a database that stores various parameters included in the underground corrosivity information in association with coordinate positions on a map, which is stored in the memory unit 22, and reads and acquires the underground corrosivity information of the manhole M. The information acquisition unit 211 further communicates with the measurement probe 10B via the communication unit 23, and acquires the result of measuring the corrosion rate of the soil within a predetermined range from the underground structure by the measurement probe 10B as underground corrosivity information.

[0103] In step S14, the information acquisition unit 211 converts each parameter of the underground corrosiveness information into a coefficient. The information acquisition unit 211 converts the parameter of the underground corrosiveness information into a coefficient with a higher value as the parameter has a greater influence on the corrosion of the manhole M.

[0104] In this embodiment, the information acquiring unit 211 converts the corrosion rate measured by the measurement probe 10B into a coefficient DX. The information acquiring unit 211 stores the converted coefficient in the storage unit 22.

[0105] In step S15, the information acquisition unit 211 determines the degree of aboveground corrosivity as "small", "medium", or "large" according to the value resulting from integrating the coefficients of each parameter of the underground corrosivity information. In this embodiment, the information acquisition unit 211 determines the degree of underground corrosivity as "medium" based on the coefficient DX.

[0106] In step S16, the information acquisition unit 211 further converts the determined degree of subsurface corrosivity into a coefficient. In this embodiment, the information acquisition unit 211 converts the degree of subsurface corrosivity of "medium" into a coefficient of s2 according to the above Table 7. The information acquisition unit 211 stores the converted coefficient in the storage unit 22.

[0107] In step S17, the evaluation unit 212 evaluates the corrosiveness of the underground structure due to the inflow from the ground. In this embodiment, the coefficient i c2 , coefficient c of ground corrosive information a2 , the coefficient r2 of the precipitation information, and the coefficient g2 of the land use information are read, and the above formula 1 is used to evaluate the ground corrosivity as y o The evaluation unit 212 calculates the calculated ground corrosivity evaluation y o ^ is stored in the memory unit 22.

[0108] In step S18, the evaluation unit 212 evaluates the corrosiveness of the underground structure due to the inflow from underground. In this embodiment, the coefficient i s2 and i t2, and the coefficient s2 of the underground corrosiveness information. The evaluation unit 212 calculates the underground corrosiveness evaluation y u The evaluation unit 212 calculates the calculated underground corrosiveness evaluation y u ^ is stored in the memory unit 22.

[0109] In step S19, the evaluation unit 212 evaluates the corrosivity of the underground structure. In this embodiment, the evaluation unit 212 receives the above-ground corrosivity evaluation y o ^ and underground corrosivity rating y u ^ and the corrosivity y^ of the underground structure is calculated using equation 3 above.

[0110] Any method may be adopted for calculating the corrosivity y^ of an underground structure. In this embodiment, the process of the corrosivity evaluation device 20 can move to the process of evaluating the underground structure at the next highest altitude after the evaluation of the target underground structure is completed. In this case, the evaluation unit 212 may evaluate the corrosivity of the target underground structure by taking into account the presence of other underground structures different from the underground structure to be evaluated for corrosivity, i.e., the underground structure whose corrosivity was evaluated previously.

[0111] As shown in steps S17 to S19, the evaluation unit 212 evaluates the corrosivity of the underground structure based on a ground corrosivity evaluation, which is the result of evaluating the corrosivity of the underground structure due to inflow from above ground based on ground corrosivity information, precipitation information, land use information, and inspection information, and an underground corrosivity evaluation, which is the result of evaluating the corrosivity of the underground structure due to inflow from underground based on underground corrosivity information and inspection information.

[0112] In step S20, the control unit 21 displays the calculated corrosivity y^ of the underground structure to the user. The display to the user may be performed by displaying it via the output unit 25, or by transmitting information indicating the corrosivity y^ of the underground structure to a terminal device used by the user and displaying it via the output unit of the terminal device. After that, the operation of the corrosivity evaluation device 20 ends.

[0113] As described above, the corrosivity evaluation device 20 of this embodiment is a corrosivity evaluation device that evaluates the corrosivity of an underground structure, and is equipped with an information acquisition unit 211 that acquires ground corrosivity information indicating parameters that affect the corrosivity in the aboveground area of ​​the underground structure, precipitation information indicating the precipitation in the aboveground area, land use information indicating the land use status of the aboveground area, underground corrosivity information indicating the corrosivity of the soil within a predetermined range from the underground structure, and inspection information indicating the inspection status of the underground structure, and an evaluation unit 212 that evaluates the corrosivity of the underground structure based on a ground corrosivity evaluation that is the result of evaluating the corrosivity of the underground structure due to inflow from above ground based on the ground corrosivity information, precipitation information, land use information, and inspection information, and an underground corrosivity evaluation that is the result of evaluating the corrosivity of the underground structure due to inflow from underground based on the underground corrosivity information and the inspection information.

[0114] According to this embodiment, the corrosivity of an underground structure can be predicted comprehensively using information indicating the corrosivity of both above-ground and underground areas of the underground structure. Since the corrosivity can be predicted without the need to inspect each underground structure, maintenance and management of the underground structure becomes easier. Therefore, the method of evaluating the corrosivity of an underground structure can be improved.

[0115] As described above, in the corrosiveness evaluation device 20 of this embodiment, when the elevation of another underground structure different from the target underground structure is higher than the elevation of the target underground structure, the evaluation unit 212 preferentially evaluates the corrosiveness of the other underground structure.

[0116] According to this embodiment, the corrosivity of other underground structures that are at a higher altitude than the target underground structure is calculated first. Therefore, the target underground structure can be evaluated by taking into account the corrosivity of the other underground structures that has been calculated first. By comparing the altitudes, even if the target underground structure is far from the other underground structures, the corrosivity of the target underground structure can be evaluated in association with the corrosivity of the other underground structures. Therefore, the method of evaluating the corrosivity of underground structures can be improved.

[0117] As described above, the corrosivity evaluation device 20 according to this embodiment further includes a communication unit 23 that communicates with the first measurement probe 10A provided in an area on the ground and the second measurement probe 10B provided in the soil within a predetermined range from the underground structure. The information acquisition unit 211 acquires the measurement results by the first measurement probe 10A as ground corrosivity information and the measurement results by the second measurement probe 10B as underground corrosivity information via the communication unit 23.

[0118] According to the present embodiment, the corrosivity of an underground structure can be evaluated more accurately using actual measurements taken by the first measurement probe 10A and the second measurement probe 10B, thereby improving the method for evaluating the corrosivity of an underground structure.

[0119] As described above, in the corrosivity evaluation device 20 according to the present embodiment, the first measurement probe 10A or the second measurement probe 10B is a measurement probe that uses a polarization resistance method.

[0120] According to the present embodiment, the corrosion rate of soil, which has a large effect on the corrosivity of underground structures, can be measured quantitatively with higher accuracy, thereby improving the method for evaluating the corrosivity of underground structures.

[0121] Although the present disclosure has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these modifications and corrections are included in the scope of the present disclosure.

[0122] As a modified example of the present disclosure, the control unit 21 of the corrosivity evaluation device 20 may acquire the measurement results by the first measurement probe 10A or the measurement results by the second measurement probe 10B from a vehicle V equipped with a communication unit that wirelessly communicates with the first measurement probe 10A and the second measurement probe 10B. FIG. 5 shows a system 2 according to this modified example. Referring to FIG. 5, the control unit 21 transmits and receives information to and from the vehicle V via the communication unit 23 and the network 30. The first measurement probe 10A and the second measurement probe 10B transmit and receive information to and from the vehicle V via their respective communication units and the network 30. As in the above-described embodiment, the first measurement probe 10A and the second measurement probe 10B can measure the corrosion rate of metal in soil using a polarization resistance method.

[0123] The vehicle V may be driven by an operator, or may be automated at any level, for example, any of levels 1 to 5 according to the Society of Automotive Engineers (SAE) classification.

[0124] The communication unit of the vehicle V includes one or more communication interfaces connected to the network 30. The communication interfaces correspond to, for example, a mobile communication standard, a wired LAN standard, or a wireless LAN standard, but are not limited to these and may correspond to any communication standard. When the vehicle V moves near an underground structure to be evaluated for corrosivity, the communication unit communicates with a first measurement probe 10A provided in an area above ground of the underground structure and a second measurement probe 10B provided in the soil within a predetermined range from the underground structure by wireless communication, and receives the measurement results of each. Any method such as Wi-Fi or Bluetooth (registered trademark) is used as the wireless communication method.

[0125] The vehicle V further includes a control unit. The control unit may be configured to include at least one processor, at least one dedicated circuit, or a combination of these. The processor is a general-purpose processor such as a CPU or a GPU, or a dedicated processor specialized for a specific process. The dedicated circuit is, for example, an FPGA or an ASIC. The control unit may execute processes related to the operation of the vehicle V while controlling each part of the vehicle V. The control unit may be capable of acquiring location information of an underground structure, and moving the vehicle V to the location of the underground structure by autonomous driving based on the location information.

[0126] The control unit of the vehicle V transmits the measurement results of the first measurement probe 10A and the second measurement probe 10B received by wireless communication to the corrosivity evaluation device 20 via the communication unit. The measurement results may be transmitted at all times, or may be transmitted when an instruction signal is received from the corrosivity evaluation device 20. The corrosivity evaluation device 20 acquires the measurement results of the first measurement probe 10A as ground corrosivity information and the measurement results of the second measurement probe 10B as ground corrosivity information by receiving them from the vehicle V.

[0127] As described above, in the corrosive evaluation device 20 of this modified example, the information acquisition unit 211 acquires the measurement results by the first measurement probe 10A or the measurement results by the second measurement probe 10B from a vehicle V equipped with a communication unit that performs wireless communication with the first measurement probe 10A or the second measurement probe 10B.

[0128] According to this modification, when the vehicle V moves near an underground structure to be evaluated for corrosivity, the measurement results by the first measurement probe 10A and the second measurement probe 10B provided near the underground structure are transmitted to the corrosivity evaluation device 20 via the vehicle V. This makes it possible to obtain aboveground corrosivity information and underground corrosivity information of a desired underground structure as actual measured values ​​in accordance with the movement of the vehicle V. This makes it possible to improve the method of evaluating the corrosivity of underground structures. [Explanation of symbols]

[0129] 1,2 System 10 Measuring probe 10A First measurement probe 10B Second measurement probe 20 Corrosion evaluation device 21 Control section 22 Memory section 23 Communications Department 24 Input section 25 Output section 211 Information Acquisition Department 212 Evaluation Department 30 Network

Claims

1. A corrosivity evaluation device for evaluating the corrosivity of an underground structure such as a manhole or an underground pipe, comprising: Obtain ground corrosivity information indicating one or more parameters relating to a ground area that affect the degree of corrosion of the underground structure, precipitation information indicating the amount of precipitation in the ground area, land use information indicating the land use status of the ground area, underground corrosivity information indicating one or more parameters relating to soil within a predetermined range from the underground structure that affect the degree of corrosion of the underground structure, and inspection information indicating one or more parameters that are the results of inspection of the underground structure; an information acquisition unit that converts each piece of acquired information into a numerical value that is larger as the degree of influence on the corrosion of the underground structure increases; an evaluation unit that evaluates the corrosivity of the underground structure based on the sum of a ground corrosivity evaluation value, which is the result of multiplying or adding together the converted numerical values ​​of the ground corrosivity information, the precipitation information, the land use information, and the inspection information, and which is the result of evaluating the corrosivity of the underground structure due to inflow from above ground, and an underground corrosivity evaluation value, which is the result of multiplying or adding together the converted numerical values ​​of the underground corrosivity information and the inspection information, and which is the result of evaluating the corrosivity of the underground structure due to inflow from underground; Equipped with The evaluation unit of the corrosivity evaluation device evaluates the corrosivity of the underground structure based on a value obtained by weighting the total value by the number of other underground structures that are at a higher altitude than the underground structure in question when there are multiple underground structures to be evaluated.

2. The corrosivity evaluation device described in claim 1, wherein the information acquisition unit acquires the measurement results by a first measurement probe installed in the above-ground area as the above-ground corrosivity information, and acquires the measurement results by a second measurement probe installed in the soil within a predetermined range from the underground structure as the below-ground corrosivity information.

3. The corrosivity evaluation device according to claim 2 , wherein the first measurement probe or the second measurement probe is a measurement probe using a polarization resistance method.

4. The corrosivity evaluation device according to claim 2 or 3, wherein the information acquisition unit acquires the measurement results by the first measurement probe or the measurement results by the second measurement probe from a vehicle equipped with a communication unit that performs wireless communication with the first measurement probe or the second measurement probe.

5. A corrosivity evaluation method implemented by a corrosivity evaluation device for evaluating the corrosivity of an underground structure, such as a manhole or an underground pipeline, comprising: Obtain ground corrosivity information indicating one or more parameters relating to a ground area that affect the degree of corrosion of the underground structure, precipitation information indicating the amount of precipitation in the ground area, land use information indicating the land use status of the ground area, underground corrosivity information indicating one or more parameters relating to soil within a predetermined range from the underground structure that affect the degree of corrosion of the underground structure, and inspection information indicating one or more parameters that are the results of inspection of the underground structure; an information acquisition step of converting each piece of acquired information into a numerical value with a larger value corresponding to a greater degree of influence on the corrosion of the underground structure; an evaluation step of evaluating the corrosivity of the underground structure based on the sum of a ground corrosivity evaluation value, which is the result of evaluating the corrosivity of the underground structure due to inflow from above ground, and an underground corrosivity evaluation value, which is the result of multiplying or adding the converted numerical values ​​of the ground corrosivity information, the precipitation information, the land use information, and the inspection information, and is the result of evaluating the corrosivity of the underground structure due to inflow from below ground, and a ground corrosivity evaluation value, which is the result of multiplying or adding the converted numerical values ​​of the underground corrosivity information and the inspection information, and is the result of evaluating the corrosivity of the underground structure due to inflow from underground; Including, In the evaluation step, when there are multiple underground structures to be evaluated, the corrosivity of the underground structure is evaluated based on a value obtained by weighting the total value by the number of other underground structures that are at a higher altitude than the underground structure in question.This is a corrosivity evaluation method.

6. The corrosivity evaluation method described in claim 5, wherein in the information acquisition step, measurement results by a first measurement probe installed in the above-ground area are acquired as the above-ground corrosivity information, and measurement results by a second measurement probe installed in the soil within a predetermined range from the underground structure are acquired as the below-ground corrosivity information.

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