Determination device, determination method, and program

Abstract

A determination device (1) according to the present disclosure comprises: an input unit (11) that receives inputs of depths (Z) from the ground surface of each of a plurality of structures (M) respectively defining internal spaces (IS), and corrosion degrees (α) indicating the degrees of corrosion of metal objects (m) respectively accommodated in the plurality of structures (M); a deterioration determination unit (14) that determines a deterioration degree indicating whether a communicating member (P), at least a portion of which is formed of metal, is deteriorated on the basis of the depths from the ground surface of two structures (M) communicated by the communicating member (P) among the plurality of structures (M), and the corrosion degrees (α) indicating the degrees of corrosion of the metal objects (m) respectively accommodated in the two structures (M); and an output unit (15) that outputs the deterioration degree.

Description

[Technical Field] 【0001】 This disclosure relates to a determination device, a determination method, and a program. [Background technology] 【0002】 Underground conduits can be damaged by loads caused by earthquakes, etc., or deteriorate due to corrosion caused by the environment in which they are installed (Non-Patent Documents 1 and 2). In addition, about half of the conduits through which cables from communication equipment are carried are made of steel, and rust is known to be the cause of defects (Non-Patent Document 3). To inspect the outer surface of underground conduits, it would be conceivable to excavate underground, but underground excavation is very costly. Therefore, conduits are inspected by inserting communication continuity testers such as mandrels (Non-Patent Document 4), pipe cameras, etc., into the inside of the conduit. [Prior art documents] [Non-patent literature] 【0003】 [Non-Patent Document 1] Katsumi Sakaki, et al., "Earthquake-Resistant Technology to Protect Communication Services from Earthquake Disasters," NTT Technical Journal, vol. 26, No. 8, pp. 16-21, 2014. [Non-Patent Document 2] Katsumi Sakaki, et al., "Effective Repair and Reinforcement Techniques for Pipeline Facilities," NTT Technical Journal, vol.26, No.8, pp.31-37, 2014. [Non-Patent Document 3] Shigeru Yamaguchi, et al., "Inspection, Diagnosis, and Repair / Restoration Technology for Pipeline Facilities," NTT Technical Journal, vol. 18, No. 3, pp. 47-50, 2006. [Non-Patent Document 4] "Underground Conduit Manual for Electrical Cables," [online], [searched December 21, 2022], Internet,<https: / / www.kkr.mlit.go.jp / road / sesaku / non_pole / qgl8vl0000006if6-att / manual.pdf> , Kinki Regional Development Bureau Road Management Division, January 2020, [Overview of the project] [Problems that the invention aims to solve] 【0004】 However, in the inspections described above, inspectors must go to the locations where pipelines connecting structures are laid out and connect continuity testers, pipe cameras, etc., to the pipelines. This creates a cumbersome process for inspectors, and especially when there are many pipelines, it results in significant costs. 【0005】 In view of these circumstances, the purpose of this disclosure is to provide a determination device, determination method, and program that can determine the deterioration of connecting members such as conduits while suppressing cumbersome work. [Means for solving the problem] 【0006】 To solve the above problems, the determination device according to this disclosure includes an input unit that receives input of the depth from the ground surface at each of a plurality of structures that define an internal space, and a degree of corrosion indicating the degree to which metal fittings housed in each of the plurality of structures are corroded; a deterioration determination unit that determines a degree of deterioration indicating whether or not the connecting member is deteriorated, based on the depth from the ground surface at each of two structures that communicate with each other by a connecting member that is at least partly made of metal, and a degree of corrosion indicating the degree to which metal fittings housed in each of the two structures are corroded; and an output unit that outputs the degree of deterioration. 【0007】 Furthermore, in order to solve the above problems, the determination method is a determination method executed by a determination device, and includes the steps of: receiving input of the depth from the ground surface at each of a plurality of structures that define an internal space, and a degree of corrosion indicating the degree to which metal fittings housed in each of the plurality of structures are corroded; determining a degree of deterioration indicating whether or not the connecting member is deteriorated, based on the depth from the ground surface at each of two structures that communicate with each other by a connecting member that is at least partly made of metal, and a degree of corrosion indicating the degree to which metal fittings housed in each of the two structures are corroded; and outputting the degree of deterioration. 【0008】 Furthermore, in order to solve the above-mentioned problems, the program relating to this disclosure causes a computer to function as the aforementioned determination device. [Effects of the Invention] 【0009】 According to the determination device, determination method, and program described herein, it is possible to determine the deterioration of connecting members such as conduits while suppressing complicated work. [Brief explanation of the drawing] 【0010】 [Figure 1] This is a block diagram showing an example of a determination device according to this disclosure. [Figure 2] This diagram illustrates the pipeline whose deterioration is determined by the judgment device shown in Figure 1. [Figure 3] Figure 2 is a diagram that shows a detailed example of the structure shown in Figure 2. [Figure 4] This is a schematic diagram showing the configuration of multiple structures and connecting members that connect the internal spaces of these multiple structures to one another. [Figure 5] This is a schematic diagram showing an example of the arrangement of multiple structures and multiple connecting members. [Figure 6] This is a schematic diagram showing another example of the arrangement of multiple structures and multiple connecting members. [Figure 7]This figure shows the relationship between depth, degree of corrosion, and deterioration of the connecting member. [Figure 8] This figure shows an example of the information output by the output unit shown in Figure 1. [Figure 9] Figure 1 is a flowchart illustrating an example of the operation by which the determination device assigns identification information. [Figure 10] Figure 1 is a flowchart illustrating an example of how the determination device determines the deterioration of the connecting member. [Figure 11] Figure 1 is a flowchart illustrating a specific example of how the judgment device determines the deterioration of the connecting member. [Figure 12] This is a hardware block diagram of the judgment device. [Modes for carrying out the invention] 【0011】 <Configuration of the judgment device> The determination device 1 of this embodiment will be described with reference to Figure 1. Figure 1 is a block diagram showing an example of the determination device 1 according to this embodiment. The determination device 1 determines the deterioration of a connecting member that connects the internal spaces defined by multiple structures to each other. 【0012】 As shown in Figure 2, structure M is, for example, a manhole located underground that defines the internal space IS. As shown in Figure 2, a portion of cable CB is housed in structure M. Cable CB may be any cable, such as a communication cable or a power cable. In a configuration where cable CB is a communication cable, cable CB extends from communication equipment 23 housed in a communication station building 22 equipped with a steel tower 21, through an underground tunnel 24, under a bridge 25, an underground connecting member P, structure M, etc. Cable CB is further supported and extended from a utility pole 26 above ground and housed in a terminal box 27. Connecting member P includes at least one of a conduit and a joint. The joint is a member for connecting conduit to conduit, or conduit to structure M. The conduit and joint may be configured as a single unit or as separate components. In this embodiment, an example in which structure M is located underground is described, but structure M may be located above ground. 【0013】 As shown in Figure 3, metal fittings m, made of metal, are installed in the internal space IS of the structure M. The metal fittings m may be terminal boxes ma that house a portion of the cable CB. The metal fittings m may also be, for example, mounting members mb that support the cable CB in the internal space IS. Furthermore, the metal fittings m may be iron ladders provided for workers to enter and exit the internal space IS. In addition, the metal fittings m may be test specimens provided to determine the deterioration of the connecting members P. 【0014】 As shown in Figure 4, one structure M (in the example in Figure 4, structure M) 1_1 The internal space IS of ) is connected to the communication member P (in the example in Figure 4, the communication member P 1_1 ) by other structures M (In the example in Figure 4, structure M 1_2 It is connected to the internal space IS of ) 【0015】 For example, if each of the multiple structures M is a straight manhole, then, as schematically shown in Figure 5, one structure M 1_1 The internal space IS is separate from other structures M 1_2 It is connected to the internal space IS and the other structure M1_2 The internal space IS of one structure M 1_1 communicates with the internal space IS of another structure M on the opposite side, and this is repeated. 1_3 【0016】 Also, when multiple structures M include a linear manhole and a branched manhole, as schematically shown in FIG. 6, the internal space IS of structure M 1_1 communicates with the internal space IS of structure M 1_2 and the internal space IS of this structure M 1_2 (=M 2_1 ) communicates with the internal space IS of structure M 1_1 on the opposite side and with the internal space IS of structure M 1_3 on a different side. Also, the branched type of manhole includes a T-shaped branch, a cross-shaped branch, etc., and thus, structure M can communicate with any number of one or more other structures M. 2_2 【0017】 Moreover, water often accumulates in the internal space IS of structure M. The water retained in structure M includes rainwater, tap water, industrial water, etc. For example, when a gap is generated due to damage to structure M or the like that allows the internal space IS of structure M to communicate with the outside, water may enter the internal space IS through the gap and accumulate. Damage to structure M includes defects in the iron lid that closes the opening provided for workers and the like to enter and exit structure M. Such damage to structure M that causes water intrusion can be detected by visual inspection by an inspector. 【0018】 Also, water that has entered the communication member P from a gap generated due to damage or the like of the communication member P that connects multiple structures M to each other may flow through the communication member P and enter the internal space IS and accumulate. In particular, gaps are likely to be formed at the joints of the communication member P, and thus, water often enters the internal space IS from the joints. As described above, damage to structure M can be detected by visual inspection by an inspector, whereas it is difficult for an inspector to visually inspect the communication member P, so it is difficult to detect damage to the communication member P by visual inspection. 【0019】 As shown in Figure 1, the determination device 1 comprises an input unit 11, a storage unit 12, an identification information assignment unit 13, a deterioration determination unit 14, and an output unit 15. 【0020】 The input unit 11 is comprised of an input interface. The input interface may also be a communication interface. For example, standards such as Ethernet (registered trademark), FDDI (Fiber Distributed Data Interface), and Wi-Fi (registered trademark) may be used for the communication interface. The storage unit 12 is comprised of memory. The memory and buffer memory may be HDD (Hard Disk Drive), SSD (Solid State Drive), EEPROM (Electrically Erasable Programmable Read-Only Memory), ROM (Read Only Memory), and RAM (Random Access Memory), etc. The identification information assignment unit 13 and the degradation determination unit 14 are comprised of a controller. The controller may be comprised of dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array), or it may be comprised of a processor, or it may include both. The output unit 15 is comprised of an output interface. 【0021】 The input unit 11 receives input of the depth Z from the ground surface at each of the multiple structures M that define the internal space IS. The depth Z may be input using information managed by the owner or manager of the structure M, or it may be input using information obtained from an organization that manages information on infrastructure facilities (for example, information from PLATEAU®). 【0022】 Furthermore, the input unit 11 receives input of a corrosion degree α, which indicates the degree of corrosion of the metal fittings m housed in each of the multiple structures M. The corrosion degree α may be estimated based on the depth from the surface of the corroded part of the metal fitting m, the area of ​​the corroded part, and the weight of the metal fitting m, or it may be estimated using known techniques with images of the metal fitting m. In addition, the corrosion degree α may be estimated based on the time when the metal fitting m was installed or replaced, and the frequency of replacement. In this case, the corrosion degree α may be estimated using a known deterioration estimation curve that shows the corrosion degree α according to the time the metal fitting m has been installed. The corrosion degree α may be a continuous value or a discrete value. Furthermore, the corrosion degree α may be a qualitative variable or a quantitative variable, but in a configuration where the corrosion degree α is a qualitative variable, the corrosion degree α is converted to a quantitative variable. 【0023】 Furthermore, the input unit 11 receives configuration information indicating the relationship between the structure M and the connecting member P that connects the two structures M to each other. 【0024】 The memory unit 12 stores the depth Z and corrosion degree α received as input by the input unit 11. The memory unit 12 also stores the arrangement information received as input by the input unit 11. Furthermore, the memory unit 12 stores the identification information assigned to the structure M and the connecting member P by the identification information assignment unit 13, associating it with the corresponding information about the structure M and the connecting member P. 【0025】 The identification information assigning unit 13 assigns identification information consisting of a main number j and a sub-number k to each of the multiple structures M and the connecting members P that connect the multiple structures M, based on the arrangement information. 【0026】 Here, with reference to Figures 5 and 6, an example of the process by which the identification information assignment unit 13 assigns identification information to each structure M and each connecting member P based on the arrangement information will be explained. 【0027】 First, the identification information assigning unit 13 assigns identification information "j_k(1_1)" consisting of a main number j and a sub-number k to identify one of the multiple structures M, with j=1 and k=1. In this embodiment, as shown in Figures 5 and 6, the structure M to which the identification information "j_k" is assigned is referred to as "structure M j_k " he said. 【0028】 Next, the identification information assigning unit 13 assigns a single structure M j_k A connecting member P connects the internal space IS of one structure to the internal space IS of another structure M. j_k The same identification information "j_k" as the identification information "j_k" assigned to the object is assigned. In addition, the identification information assignment unit 13 assigns the same identification information "j_k" to one structure M j_k A metal fitting m housed within a structure M j_k The same identification information "j_k" that was previously assigned to the object is assigned. 【0029】 Then, the identification information assigning unit 13 assigns one structure M to the other structure M mentioned above. j_k The identification information is assigned to the other structure M, consisting of the same main number j as the main number j that constitutes the identification information "j_k" assigned to the other structure M, and a sub-number k+1 which is obtained by adding 1 to the sub-number k that constitutes the identification information "j_k". In other words, the identification information assignment unit 13 assigns the identification information "j_k" to the other structure M by setting k=k+1. In the example shown in Figure 5, the structure M 1_1 The internal space IS is connected to the structure M, 1_1 Identification information "1_2" is assigned, which consists of the same main number 1 as the main number 1 of identification information "1_1", and a sub-number 2 obtained by adding 1 to the sub-number 1 of the identification information "1_1" (structure M 1_2 ). 【0030】 By repeating this process, the identification information assigning unit 13 assigns identification information from "1_1" to "1_nj" (where nj is the maximum value of the secondary number k when the primary number is j) to nj structures M. The identification information assigning unit 13 assigns identification information from "1_1" to "1_nj" to the metal fittings m housed in each of the nj structures. In addition, the identification information assigning unit 13 assigns identification information from "1_1" to "1_nj-1" to (nj-1) connecting members P. 【0031】 Furthermore, the identification information assigning unit 13 assigns an identification information to a single structure M (for example, the structure M shown in Figure 6). 1_2 If the internal space IS of the first structure M is further connected to the internal space IS of each of the multiple structures M to which identification information has not been assigned, the first structure M among the multiple structures M is assigned identification information as one of the other structures M described above. That is, the identification information assigning unit 13 assigns identification information to the first structure M as one of the structures M j_k The identification information is assigned to the first structure M, consisting of the same main number j as the main number j that constitutes the identification information "j_k" assigned to the first structure M, and a sub-number k+1 obtained by adding 1 to the sub-number k that constitutes the identification information "j_k". In other words, the identification information assignment unit 13 assigns the identification information "j_k" to the first structure M with k=k+1. 【0032】 In the example shown in Figure 6, one structure M j_k Structure M 1_2 In that case, the structure M j_k (Structure M 1_2 ) consists of multiple structures M (structure M 1_3 and structure M 2_2 It is further in communication with each of the internal spaces IS of the multiple structures M (structure M 1_3 and structure M 2_2 ) the first structure M (for example, structure M 1_3 ) as another structure M as described above, one structure M (structure M 1_2 The identification information "1_3" is assigned, which consists of the same main number j(=1) as the main number j(=1) of the identification information of ), and a sub-number k+1(=3) which is obtained by adding 1 to the sub-number k(=2). 【0033】 Furthermore, the identification information assigning unit 13 is a single structure M 1_2 =M 2_1 and the first structure M 1_3 A connecting member P connects two structures M 1_2 =M 2_1 The same identification information "1_2" as the identification information "1_2" is assigned. In addition, the identification information assignment unit 13 assigns the first structure M 1_3 The metal fitting m housed within the first structure M 1_3 Assign the same identification information "1_3" as (Hardware) 1_3 ). 【0034】 Furthermore, the identification information assignment unit 13 assigns the smallest integer not used as the main number j to one structure M as the main number j, and assigns additional identification information "j_1" consisting of the main number j and sub-number 1. The identification information assignment unit 13 also assigns identification information "j_2" to a second structure M, which is different from the first structure M among the multiple structures M to which the above-mentioned identification information has not been assigned, to the second structure M, which is different from the first structure M. This identification information "j_2" consists of the same main number j as the additional identification information "j_1", and a sub-number obtained by adding 1 to the sub-number of the additional identification information "j_1". In the example shown in Figure 6, one structure M j_k Structure M 1_2 In this case, the identification information assigning unit 13 sets 2, the smallest integer not used as a main number, as the main number, and assigns additional identification information ("2_1") consisting of the main number 2 and the sub-number 1 to a single structure M j_k (M 1_2 ) further grants (structure M 1_2 =M 2_1 ). Then, the identification information assigning unit 13 assigns to the second structure M identification information "j_2" which consists of the same main number j as the additional identification information "j_1" of the first structure M, and a sub-number 2 which is obtained by adding 1 to the sub-number 1 of the additional identification information "j_1" (structure M 2_2 ). 【0035】 Furthermore, the identification information assigning unit 13 is a single structure M 1_2 =M 2_1 and the second structure M 2_2 A connecting member P that connects the two. 2_1 In, one structure M1_2 =M 2_1 The same identification information "2_1" as the additional identification information "2_1" is assigned. In addition, the identification information assignment unit 13 assigns the second structure M 2_2 The metal fitting m housed within the second structure M 2_2 Assign the same identification information "2_2" (Hardware) 2_2 ). 【0036】 By repeating this process, the identification information assigning unit 13 can assign identification information to each of the multiple structures M. Furthermore, the identification information assigning unit 13 can assign identification information to each of the multiple connecting members P. 【0037】 The deterioration determination unit 14 determines whether or not the connecting member P is deteriorated, based on the depth Z from the ground surface of each of the two structures M that are connected to each other by a connecting member P which is at least partially made of metal, and the degree of corrosion α which indicates the degree to which the metal fittings m housed in each of the two structures M are corroded. 【0038】 As described above, water can seep into the internal space IS of structure M through gaps in connecting members P, which are difficult to detect by visual inspection, and accumulate in the internal space IS of structure M. Furthermore, water can also accumulate in the internal space IS of structure M from other internal spaces IS of structure M located at a higher position, via the connecting members P. This accumulation of water causes corrosion of the metal components m housed within structure M. The rate of corrosion of the metal components m depends on properties such as the potential hydrogen (pH) and chloride concentration of the water. 【0039】 Therefore, as shown in Figure 4, two adjacent and interconnected structures M j_k and M j_k+1 -The metal fittings housed in each j_k and m j_k+1 Corrosion degree α j_k and α j_k+1 If the two structures M are the same,j_k and M j_k The same quality water stays in the internal space IS of and M, and it is presumed that water does not penetrate from the gap of the communication member P. Therefore, it is determined that the communication member P has not deteriorated. In contrast, among the two structures M j_k and M j_k and M j_k+1 - if the corrosion degree α of the hardware m accommodated in the structure M with a larger depth Z is higher than the corrosion degree α of the hardware m accommodated in the structure M with a smaller depth Z, it is presumed that the water causing the corrosion of the structure M with a larger depth Z penetrates from the gap of the communication member P. Therefore, it is determined that the communication member P has deteriorated. 【0040】 Here, the deterioration determination unit 14 determines whether the communication member P that connects the two structures M j_k and M j_k+1 - each depth Z j_k and Z j_k+1 , and the hardware m j_k and M j_k - respectively accommodated in the internal spaces IS of the structures M j_k and m j_k+1 each corrosion degree α j_k and α j_k - based on, whether the communication member P that connects the two structures M j_k and the structure M j_k+1 has deteriorated will be described in detail with an example. j_k will be described in detail with an example. 【0041】 As shown in FIG. 1, the deterioration determination unit 14 includes a depth determination unit 141, a corrosion degree determination unit 142, and a determination unit 143. 【0042】 The depth determination unit 141 determines whether the depth difference, which is the difference between the depths Z j_k and M j_k+1 each of the two structures M j_k and Z j_k+1 is greater than or equal to the depth threshold. Also, the depth determination unit 141 determines the depths Z j_k and M j_k+1 of the two structures M j_k and Zj_k+1 Determine which one is larger. Note that the depth difference is the absolute value of the difference between the depths Z j_k and Z j_k+1 The depth threshold is an error in the depth Z that does not affect the determination of deterioration in the determination by the deterioration determination unit 14, and is, for example, 0.1 meter. 【0043】 The corrosion degree determination unit 142 determines whether the corrosion degree difference, which is the difference between the corrosion degrees α j_k and α j_k+1 of the two hardware items m j_k and m j_k+1 accommodated in the two structures M j_k and α j_k+1 is greater than or equal to the corrosion degree threshold. Further, the corrosion degree determination unit 142 determines which of the corrosion degrees α j_k and α j_k+1 of the two hardware items m j_k and α j_k+1 is higher. Note that the corrosion degree difference is the absolute value of the difference between the corrosion degrees α j_k and α j_k+1 The corrosion degree threshold is an error in the corrosion degree α that does not affect the determination of deterioration in the determination by the deterioration determination unit 14. 【0044】 As shown in FIG. 7, when the determination unit 143 determines that the corrosion degree difference is less than the corrosion degree threshold, it determines that the communication member P j_k is not deteriorated. Further, when the determination unit 143 determines that the corrosion degree difference is greater than or equal to the corrosion degree threshold and the corrosion degree α of the hardware item m accommodated in the structure M with the larger depth Z among the two structures M j_k and M j_k+1 is determined to be high, it determines that the communication member P j_k is deteriorated. 【0045】 Further, when the determination unit 143 determines that the corrosion degree difference is greater than or equal to the corrosion degree threshold and the depth difference is less than the depth threshold, it determines that the communication member P j_k may be deteriorated. When the determination unit 143 determines that the corrosion degree difference is greater than or equal to the corrosion degree threshold and the corrosion degree α of the hardware item m accommodated in the structure M with the larger depth Z among the two structures M j_k and M j_k+1If the degree of corrosion α of the metal fittings m housed in a structure M with a small depth Z is determined to be high, then the connecting member P j_k It is determined that there is a possibility that it is deteriorating. At this time, the determination unit 143 can determine that any of the following (1) to (3) is occurring. (1) A connecting member P from a structure M with a small depth Z j_k Corrosive water flows into the connecting member P j_k It is leaking out from the deteriorated parts. (2) Connecting member P from structure M with a small depth Z j_k Corrosive water flows into the connecting member P j_k or connecting member P j_k+1 When mixed with non-corrosive water flowing in from elsewhere, the corrosivity is reduced in structures M at greater depths Z. (3) Water is flowing in from a deteriorated part of a structure M with a small depth Z (for example, a deteriorated part of a manhole cover). 【0046】 Furthermore, an example of a determination made by the determination unit 143 will be explained in detail. 【0047】 First, the determination unit 143 determines the structure M j_k Depth Z j_k and structure M j_k+1 Depth Z j_k+1 It determines whether the depth difference, which is the difference between the current state and the current state, is greater than or equal to the depth threshold. 【0048】 Depth Z j_k and depth Z j_k+1 If the depth difference, which is the difference between the two, is determined to be less than the depth threshold, the corrosion degree determination unit 142 determines the corrosion degree α j_k and corrosion degree α j_k+1 The determination unit determines whether the corrosion degree difference, which is the difference between the two, is equal to or greater than the corrosion degree threshold. If it is determined that the corrosion degree difference is less than the corrosion degree threshold, the determination unit 143 determines whether the communication member P j_k It is determined that the connecting member P is not deteriorated. If it is determined that the corrosion degree difference is greater than or equal to the corrosion degree threshold, the determination unit 143 determines that the connecting member P j_k It is determined that there is a possibility of deterioration. 【0049】 Depth Z j_k and depth Z j_k+1 If the depth difference, which is the difference between the depth and the depth, is determined to be greater than or equal to the depth threshold, the determination unit 143 determines the depth Z j_k is depth Z j_k+1 Determine whether it is smaller or not. 【0050】 Depth Z j_k is depth Z j_k+1 If it is determined to be greater than α, the determination unit 143 determines the corrosion degree α j_k and corrosion degree α j_k+1 The determination unit determines whether the corrosion degree difference, which is the difference between the two, is equal to or greater than the corrosion degree threshold. If it is determined that the corrosion degree difference is less than the corrosion degree threshold, the determination unit 143 determines whether the communication member P j_k It is determined that there is no deterioration. If it is determined that the corrosion degree difference is greater than or equal to the corrosion degree threshold, the determination unit 143 determines the corrosion degree α j_k Corrosion degree α j_k+1 Determine whether it is higher or lower. Corrosion degree α j_k Corrosion degree α j_k+1 If it is determined to be higher, the determination unit 143 determines that the communication member P j_k It is determined that it is deteriorating. Corrosion degree α j_k Corrosion degree α j_k+1 If it is determined to be lower, the determination unit 143 determines that the communication member P j_k It is determined that there is a possibility of deterioration. 【0051】 Depth Z j_k is depth Z j_k+1 If it is determined to be smaller, the determination unit 143 determines the corrosion degree α j_k and corrosion degree α j_k+1 The determination unit determines whether the corrosion degree difference, which is the difference between the two, is equal to or greater than the corrosion degree threshold. If it is determined that the corrosion degree difference is less than the corrosion degree threshold, the determination unit 143 determines whether the communication member P j_k It is determined that there is no deterioration. If it is determined that the corrosion degree difference is greater than or equal to the corrosion degree threshold, the determination unit 143 determines the corrosion degree α j_k Corrosion degree α j_k+1 Determine whether it is higher or lower. Corrosion degree α j_k Corrosion degree α j_k+1 If it is determined to be higher, the determination unit 143 determines that the communication member P j_kIt is determined that there is a possibility of deterioration. Corrosion degree α j_k Corrosion degree α j_k+1 If it is determined to be lower, the determination unit 143 determines that the communication member P j_k It is determined that it has deteriorated. 【0052】 The determination unit 143 is connected to the communication member P j_k When it is determined whether or not the connecting member P is deteriorating, the same process is repeated by setting k=k+1, j_1 From the connecting member P j_nj The determination unit 143 determines whether each of the following is deteriorated or not. j_nj When it is determined whether or not the connecting member P is deteriorating, the same process is repeated by setting j=j+1 and k=1. 1_1 From the connecting member P s_ns It is determined whether each of the following is deteriorated or not. s is the maximum value of j. This determines which of the following is the communication member P that is subject to evaluation. j_k It can perform a thorough determination without requiring any configuration. 【0053】 As shown in Figure 8, the output unit 15 outputs the degree of deterioration determined by the deterioration determination unit 14. The degree of deterioration is determined by the communication member P j_k This information indicates whether or not the component is degraded. In this example, as described above, the degree of degradation is expressed in three degrees: "no degradation (corresponding to 'not degraded' above)", "possibility of degradation (corresponding to 'possibly degraded' above)", and "degradation present (corresponding to 'degraded' above)". The output unit 15 may output the degree of degradation to a display device, or it may output the degree of degradation to another device via a communication network. The output unit 15 may also output identification information, the degree of degradation of the communication component P identified by the identification information, and countermeasures corresponding to the degree of degradation in association with each other. 【0054】 If it is determined that the connecting member P is not deteriorated, it is recommended to check the condition of the connecting member P before proceeding with the work of running the cable CB through the connecting member P, without performing immediate repairs. Therefore, the output unit 15 may output "Pre-cable installation diagnosis" as a countermeasure corresponding to "No deterioration," which indicates that the connecting member P is not deteriorated. Also, if it is determined that there is a possibility that the connecting member P is deteriorated, it is recommended to repair the connecting member P as soon as possible. Therefore, the output unit 15 may output "Early repair" as a countermeasure corresponding to "Potential deterioration," which indicates that there is a possibility that the connecting member P is deteriorated. Furthermore, if it is determined that there is a possibility that the connecting member P is deteriorated, it may be recommended to avoid running the cable CB through the connecting member P, and in this case, the output unit 15 may output "Design the cable CB so that it does not pass through the connecting member P" as a countermeasure. 【0055】 <The process by which the determination device assigns identification information> Here, the operation by which the determination device 1 according to this embodiment assigns identification information will be described with reference to Figure 9. Figure 9 is a flowchart showing an example of the operation by which the determination device 1 according to this embodiment assigns identification information. The operation by which the determination device 1 assigns identification information, described with reference to Figure 9, corresponds to an example of the method by which the determination device 1 according to this embodiment assigns identification information. 【0056】 In step S11, the identification information assignment unit 13 sets the structure M which will be the starting point for assigning identification information. 【0057】 In step S12, the identification information assigning unit 13 sets j=1 and k=1. 【0058】 In step S13, the identification information assigning unit 13 assigns identification information "j_k" consisting of a main number j and a sub-number k to identify one of the multiple structures M. 【0059】 In step S14, the identification information assignment unit 13 determines whether the internal space IS of structure M is in communication with each of the multiple internal spaces IS of structure M to which identification information has not been assigned. 【0060】 If, in step S14, it is determined that the internal space IS of structure M is not in communication with any of the internal spaces IS of multiple structures M to which identification information has not been assigned, then in step S15, the identification information assignment unit 13 determines whether or not the internal space IS of structure M is in communication with one internal space IS of structure M to which identification information has not been assigned. 【0061】 In step S15, if it is determined that the internal space IS of structure M is not in communication with the internal space IS of one structure M that has not been assigned identification information, the determination device 1 terminates the process. 【0062】 In step S15, if it is determined that the internal space IS of structure M is in communication with the internal space IS of another structure M that has not been assigned identification information, then in step S16, the identification information assigning unit 13 assigns the identification information to structure M j_k A connecting member P connects the internal space IS of one structure to the internal space IS of another structure M. j_k The same identification information "j_k" that was previously assigned to the object is assigned. 【0063】 In step S17, the identification information assigning unit 13 assigns the structure M j_k The metal fittings m housed within the structure M j_k The same identification information "j_k" that was previously assigned to the object is assigned. 【0064】 In step S14, if it is determined that the internal space IS of structure M is in communication with each of the internal spaces IS of multiple structures M that have not been assigned identification information, then in step S18, the identification information assigning unit 13 assigns the internal space IS of structure M j_k A connecting member P connects the internal space IS of one of several structures M that have not been assigned identification information to the internal space IS of the first structure M. j_kThe same identification information "j_k" that was previously assigned to the object is assigned. 【0065】 In step S19, the identification information assigning unit 13 assigns the structure M j_k The metal fittings m housed within the structure M j_k The same identification information "j_k" that was previously assigned to the object is assigned. 【0066】 In step S20, the identification information assigning unit 13 sets j to the smallest integer that has not yet been used as the main number, and sets k=1. 【0067】 In step S21, the identification information assignment unit 13 assigns additional identification information "j_k" to one structure M. 【0068】 In step S22, the identification information assigning unit 13 assigns the same identification information as the additional identification information to the connecting member P that connects the first structure M and the second structure M. 【0069】 In step S23, the identification information assigning unit 13 sets the structure M to which identification information will be assigned next. The target structure M is a structure M to which the identification information assigning unit 13 has previously assigned identification information, and whose internal space IS is connected by a connecting member P to which identification information was assigned immediately before, but to which identification information has not yet been assigned. 【0070】 In step S24, the identification information assigning unit 13 returns to step S13, setting k=k+1. 【0071】 <The operation by which the detection device determines deterioration> The operation by which the determination device 1 according to this embodiment determines deterioration will be described with reference to Figure 10. Figure 10 is a flowchart showing an example of the operation by which the determination device 1 according to this embodiment determines deterioration. The operation by which the determination device 1 determines deterioration, as described with reference to Figure 10, corresponds to an example of the determination method by which the determination device 1 according to this embodiment determines deterioration. 【0072】 Prior to this operation, the input unit 11 has already received inputs of the depth Z from the ground surface for each of the multiple structures M that define the internal space IS, and the degree of corrosion α, which indicates the degree of corrosion of the metal fittings m housed in each of the multiple structures M. The storage unit 12 also stores the depth Z and degree of corrosion α that have been received by the input unit 11. 【0073】 In steps S31 to S38, the deterioration determination unit 14 determines two of the multiple structures M j_k and M j_k+1 Depth Z from the ground surface in each case j_k and Z j_k+1 , and two structures M j_k and M j_k+1 Each contains metal parts j_k and m j_k+1 Corrosion degree α indicates the degree of corrosion. j_k and α j_k+1 Based on this, two structures M j_k and M j_k+1 A connecting member P, at least partially formed of metal, connects the two. j_k Determine the degree of deterioration, which indicates whether or not the product has deteriorated. 【0074】 First, in step S31, the corrosion degree determination unit 142 determines the depth Z stored in the memory unit 12. j_k and Z j_k+1 , and corrosion degree α j_k and α j_k+1 Extract it. 【0075】 In step S32, the corrosion degree determination unit 142 determines the corrosion degree α j_k and α j_k+1 It is determined whether the difference in corrosion degree, which is the difference between the two values, is equal to or greater than the corrosion degree threshold. 【0076】 If, in step S32, it is determined that the corrosion degree difference is less than the corrosion degree threshold, then in step S33, the determination unit 143 determines that the communicating member P j_k It is determined that it has not deteriorated. 【0077】 If, in step S32, it is determined that the corrosion degree difference is greater than or equal to the corrosion degree threshold, then in step S34, the depth determination unit 141 determines the depth Z j_k and Z j_k+1 It determines whether the depth difference, which is the difference between the two values, is greater than or equal to the depth threshold. 【0078】 If in step S34 it is determined that the depth difference is less than the depth threshold, then in step S35 the determination unit 143 determines that the communication member P j_k It is determined that there is a possibility of deterioration. 【0079】 If in step S34 it is determined that the depth difference is greater than or equal to the depth threshold, then in step S36 the depth determination unit 141 determines the depth Z j_k and Z j_k+1 Determine which of the following is larger. 【0080】 In step S37, the corrosion degree determination unit 142 determines whether the corrosion degree α of the metal fitting m housed in the structure M with the greater depth Z of the two structures M is high. 【0081】 If, in step S37, it is determined that the degree of corrosion α of the metal fitting m housed in the structure M with the greater depth Z of the two structures M is high, then in step S38, the determination unit 143 determines that the communicating member P j_k It is determined that it has deteriorated. 【0082】 If, in step S37, it is determined that the degree of corrosion α of the metal fitting m housed in the structure M with the greater depth Z of the two structures M is low, then in step S35, the determination unit 143 determines that the communicating member P j_k It is determined that there is a possibility of deterioration. 【0083】 In step S39, the output unit 15 outputs the degree of degradation. 【0084】 Furthermore, a more specific example of the operation by which the determination device 1 according to this embodiment determines deterioration will be described with reference to Figure 11. Figure 11 is a flowchart showing an example of the operation by which the determination device 1 according to this embodiment determines deterioration. The operation by which the determination device 1 determines deterioration, as described with reference to Figure 11, corresponds to an example of the determination method by which the determination device 1 according to this embodiment determines deterioration. 【0085】 Prior to this operation, the input unit 11 has already received inputs of the depth Z from the ground surface for each of the multiple structures M that define the internal space IS, and the degree of corrosion α, which indicates the degree of corrosion of the metal fittings m housed in each of the multiple structures M. The storage unit 12 also stores the depth Z and degree of corrosion α that have been received by the input unit 11. 【0086】 In step S41, the degradation determination unit 14 sets j=1 and k=1. 【0087】 In step S42, the degradation determination unit 14 determines the depth Z j_k , Z j_k+1 , and corrosion degree α j_k , α j_k+1 Extract the data from the memory unit 12. 【0088】 In steps S43 to S56, the deterioration determination unit 14 determines the depth Z j_k , Z j_k+1 and corrosion degree α j_k , α j_k+1 Based on this, the connecting member P j_k Determine whether or not it has deteriorated. 【0089】 Specifically, in step S43, the depth determination unit 141 determines the depth Z j_k and depth Z j_k+1 It determines whether the depth difference, which is the difference between the current state and the current state, is greater than or equal to the depth threshold. 【0090】 If it is determined in step S43 that the depth difference is less than the depth threshold, then in step S44 the corrosion degree determination unit 142 determines the corrosion degree α j_k and corrosion degree α j_k+1It is determined whether the difference in corrosion degree, which is the difference between the two values, is equal to or greater than the corrosion degree threshold. 【0091】 If, in step S44, it is determined that the corrosion degree difference is less than the corrosion degree threshold, then in step S45, the determination unit 143 determines that the communicating member P j_k It is determined that it has not deteriorated. 【0092】 If, in step S44, it is determined that the corrosion degree difference is equal to or greater than the corrosion degree threshold, then in step S46, the determination unit 143 determines that the communicating member P j_k It is determined that there is a possibility of deterioration. 【0093】 If it is determined in step S43 that the depth difference is greater than or equal to the depth threshold, then in step S47 the depth determination unit 141 determines the depth Z j_k is depth Z j_k+1 Determine whether it is smaller or not. 【0094】 In step S47, depth Z j_k is depth Z j_k+1 If it is determined to be greater, in step S48, the corrosion degree determination unit 142 determines whether the corrosion degree difference is greater than or equal to the corrosion degree threshold. 【0095】 If, in step S48, it is determined that the corrosion degree difference is less than the corrosion degree threshold, the determination unit 143 proceeds to step S45 and communicates with the connecting member P j_k It is determined that it has not deteriorated. 【0096】 If, in step S48, it is determined that the corrosion degree difference is greater than or equal to the corrosion degree threshold, then in step S49, the corrosion degree determination unit 142 determines the corrosion degree α j_k Corrosion degree α j_k+1 Determine whether it is higher or lower. 【0097】 In step S49, corrosion degree α j_k Corrosion degree α j_k+1 If it is determined to be lower, the determination unit 143 proceeds to step S46 and communicates with the communication member P j_k It is determined that there is a possibility of deterioration. 【0098】 In step S49, corrosion degree α j_k Corrosion degree α j_k+1 If it is determined to be higher, in step S50 the determination unit 143 determines that the communication member P j_k It is determined that it has deteriorated. 【0099】 In step S47, depth Z j_k is depth Z j_k+1 If it is determined to be smaller, in step S51, the corrosion degree determination unit 142 determines whether the corrosion degree difference is greater than or equal to the corrosion degree threshold. 【0100】 If, in step S51, it is determined that the corrosion degree difference is less than the corrosion degree threshold, the determination unit 143 proceeds to step S45 and the communication member P j_k It is determined that it has not deteriorated. 【0101】 If, in step S51, it is determined that the corrosion degree difference is greater than or equal to the corrosion degree threshold, then in step S52, the corrosion degree determination unit 142 determines the corrosion degree α j_k Corrosion degree α j_k+1 Determine whether it is higher or lower. 【0102】 In step S52, the degree of corrosion α j_k Corrosion degree α j_k+1 If it is determined to be higher, the determination unit 143 proceeds to step S46 and communicates with the communication member P j_k It is determined that there is a possibility of deterioration. 【0103】 In step S52, the degree of corrosion α j_k Corrosion degree α j_k+1 If it is determined to be lower, the determination unit 143 proceeds to step S50 and communicates with the communication member P j_k It is determined that it has deteriorated. 【0104】 In step S53, the degradation determination unit 14 determines whether k+1=nj. As described above, this is the maximum value of the secondary number k when the primary number is j. 【0105】 If it is determined in step S53 that k+1=nj, then in step S54 the degradation determination unit 14 sets k=k+1 and returns to step S42. 【0106】 In step S54, the degradation determination unit 14 determines whether j = s. As described above, s is the maximum value of j. 【0107】 If it is determined in step S51 that j=s is not true, then in step S56 the degradation determination unit 14 sets j=j+1 and returns to step S42. 【0108】 If it is determined in step S51 that j=s, then in step S57 the output unit 15 outputs the degree of degradation. 【0109】 In the above description, the determination device 1 determined the degree of deterioration of all connecting members P to which identification information has been assigned, but it is not limited to this. For example, the determination device 1 may determine the deterioration of one or more of the connecting members P. 【0110】 As described above, the determination device 1 according to this embodiment includes an input unit 11 that receives input of the depth Z from the ground surface at each of the multiple structures M that define the internal space IS, and a corrosion degree α indicating the degree of corrosion of the metal parts m housed in each of the multiple structures M; a deterioration determination unit 14 that determines the degree of deterioration indicating whether or not the connecting member P, which connects two of the multiple structures M and is at least partially made of metal, has deteriorated, based on the depth Z from the ground surface at each of the multiple structures M and the corrosion degree α indicating the degree of corrosion of the metal parts m housed in each of the two structures M; and an output unit 15 that outputs the degree of deterioration. As a result, the determination device 1 can determine the degree of deterioration of the connecting member P based on information about the structures M that define the internal space IS, which is relatively easy to access.Therefore, the determination device 1 can easily determine the degree of deterioration without the inspector having to perform complicated tasks such as making communication continuity testers, pipe cameras, etc., continuity testers, pipe cameras, etc. 【0111】 Furthermore, in the determination device 1 according to this embodiment, the deterioration determination unit 14 determines whether the corrosion degree difference, which is the difference in the corrosion degree α of the two metal fittings m housed in each of the two structures M, is greater than or equal to the corrosion degree threshold, and if the corrosion degree difference is greater than or equal to the corrosion degree threshold, the corrosion degree determination unit 142 determines which of the two metal fittings m has a greater corrosion degree α; the depth determination unit 141 determines whether the depth difference, which is the difference in the depth Z of each of the two structures M, is greater than or equal to the depth threshold, and if it is determined that the depth difference is greater than or equal to the depth threshold, the depth determination unit 141 determines which of the two structures M has a greater depth Z; and if it is determined that the corrosion degree difference is less than the corrosion degree threshold, the connecting member P has deteriorated. The device has a determination unit 143 which determines that if it is not corroded and the difference in corrosion degree is determined to be greater than or equal to the corrosion degree threshold, it determines whether the difference in depth is greater than or equal to the depth threshold, and if it is determined that the difference in depth is less than the depth threshold, it determines that there is a possibility that the connecting member P is deteriorating, and if it is determined that the difference in depth is greater than or equal to the depth threshold, it determines that the corrosion degree α of the metal fitting m housed in the structure M with a larger depth Z of the two structures M is high, it determines that the connecting member P is deteriorating, and if it is determined that the corrosion degree α of the metal fitting m housed in the structure M with a smaller depth Z of the two structures M is high, it determines that there is a possibility that the connecting member P is deteriorating. In this way, the determination device 1 can determine the deterioration of the connecting member P, which is difficult to directly visually inspect, based on information about the structure M that defines the internal space IS which is relatively easy to enter and exit. 【0112】 Furthermore, the determination device 1 according to this embodiment includes an identification information assigning unit 13 that assigns identification information consisting of a main number j and a secondary number k to one of the multiple structures M, assigns the same identification information as that assigned to one structure M to a connecting member P that connects the internal space IS of one structure M to the internal space IS of another structure M, and assigns identification information to the other structures M consisting of the same main number j as that which constitutes the identification information assigned to one structure M, and a secondary number k+1 which is obtained by adding 1 to the secondary number k that constitutes the identification information. By assigning identification information in this way, the determination device 1 can comprehensively perform determinations on two structures M that are in communication with each other and the connecting member P that connects the two structures M. Therefore, without the administrator or the like performing the task of setting the connecting member P to be determined, the determination device 1 can comprehensively determine the deterioration of the structures M and connecting member P that are spread out underground. 【0113】 <Program> The judgment device 1 described above can be implemented by a computer 301. A program for functioning as the judgment device 1 may also be provided. This program may be stored on a storage medium or provided via a network. Figure 12 is a block diagram showing the schematic configuration of a computer 301 functioning as the judgment device 1. Here, the computer 301 may be a general-purpose computer, a dedicated computer, a workstation, a PC (Personal Computer), an electronic notepad, etc. Program instructions may be program code, code segments, etc., for executing the required tasks. 【0114】 As shown in Figure 12, the computer 301 comprises a processor 310, a ROM (Read Only Memory) 320, a RAM (Random Access Memory) 330, storage 340, an input unit 350, an output unit 360, and a communication interface (I / F) 370. Each component is connected to the others via a bus 380 so as to be able to communicate with each other. The processor 310 is specifically a CPU (Central Processing Unit), MPU (Micro Processing Unit), GPU (Graphics Processing Unit), DSP (Digital Signal Processor), SoC (System on a Chip), etc., and may be composed of multiple processors of the same or different types. 【0115】 The processor 310 controls each configuration and performs various arithmetic operations. Specifically, the processor 310 reads a program from the ROM 320 or storage 340 and executes the program using the RAM 330 as a working area. The processor 310 controls each configuration and performs various arithmetic operations according to the program stored in the ROM 320 or storage 340. In the embodiment described above, the program according to this disclosure is stored in the ROM 320 or storage 340. 【0116】 The program may be stored on a storage medium readable by computer 301. Using such a storage medium, the program can be installed on computer 301. Here, the storage medium on which the program is stored may be a non-transitory storage medium. The non-transitory storage medium is not particularly limited, but may include, for example, a CD-ROM, DVD-ROM, or USB (Universal Serial Bus) memory. Alternatively, the program may be downloaded from an external device via a network. 【0117】 ROM320 stores various programs and data. RAM330 temporarily stores programs or data as a working area. Storage340 consists of an HDD (Hard Disk Drive) or SSD (Solid State Drive) and stores various programs and data, including the operating system. 【0118】 The input unit 350 includes one or more input interfaces that receive user input operations and acquire information based on the user operations. For example, the input unit 350 is a pointing device, a keyboard, a mouse, etc., but is not limited to these. 【0119】 The output unit 360 includes one or more output interfaces for outputting information. For example, the output unit 360 is a display that outputs information as video, or a speaker that outputs information as audio, but is not limited to these. If the output unit 360 is a touch panel display, it also functions as an input unit 350. 【0120】 The communication interface 370 is an interface for communicating with external devices. 【0121】 The following additional information is disclosed regarding the embodiments described above. [Additional note 1] It comprises an input interface, a controller, and an output interface. The input interface accepts inputs of the depth from the ground surface at each of the multiple structures that define the internal space, and the degree of corrosion indicating the degree to which the metal fittings housed in each of the multiple structures are corroded. The controller determines a degree of deterioration indicating whether the connecting member is deteriorated or not, based on the depth from the ground surface of each of the two structures that are connected to each other by a connecting member, at least part of which is made of metal, and the degree of corrosion, which indicates the degree to which the metal fittings housed in each of the two structures are corroded. The output interface is a determination device that outputs the degree of deterioration. [Additional note 2] The aforementioned controller, Determine whether the difference in corrosion degree between the two metal fittings housed in each of the two structures is greater than or equal to the corrosion threshold, and if the difference in corrosion degree is greater than or equal to the corrosion threshold, determine which of the two metal fittings has a greater degree of corrosion. Determine whether the depth difference, which is the difference in depth between the two structures, is greater than or equal to the depth threshold. If it is determined that the depth difference is greater than or equal to the depth threshold, determine which of the two structures has a greater depth. The determination device according to Appendix 1, wherein if the difference in corrosion degree is determined to be less than the corrosion degree threshold, it is determined that the connecting member is not deteriorated; if the difference in corrosion degree is determined to be greater than or equal to the corrosion degree threshold, it is determined whether the difference in depth is greater than or equal to the depth threshold; if the difference in depth is determined to be less than the depth threshold, it is determined that the connecting member may be deteriorated; if the difference in depth is determined to be greater than or equal to the depth threshold, and it is determined that the metal fitting housed in the structure with the greater depth of the two structures is highly corroded, it is determined that the connecting member is deteriorated; and if it is determined that the metal fitting housed in the structure with the smaller depth of the two structures is highly corroded, it is determined that the connecting member may be deteriorated. [Additional note 3] The determination device according to Appendix 1 or 2, wherein the controller assigns identification information consisting of a main number and a sub-number to one of the plurality of structures, assigns the same identification information as that assigned to the one structure to the communicating member that connects the internal space of the one structure to the internal space of another structure, and assigns the other structures identification information consisting of the same main number that constitutes the identification information assigned to the one structure, and a sub-number obtained by adding 1 to the sub-number that constitutes the identification information. [Additional note 4] The determination device according to Appendix 3, wherein, if the internal space of one structure is in communication with the internal spaces of each of the multiple structures to which the identification information has not been assigned, the controller assigns the first structure among the multiple structures to the other structures, further assigns the smallest integer not used as the main number to the main number, and assigns additional identification information to the one structure consisting of the main number and sub-number 1, and assigns identification information to a second structure, which is different from the first structure among the multiple structures to which the identification information has not been assigned, consisting of the same main number as the additional identification information and a sub-number obtained by adding 1 to the sub-number of the additional identification information. [Additional note 5] A determination method performed by a determination device, The system accepts inputs for the depth from the ground surface at each of the multiple structures that define the internal space, and the degree of corrosion indicating the degree to which the metal fittings housed in each of the multiple structures are corroded. Based on the depth from the ground surface of each of the two structures that are connected to each other by a connecting member, at least part of which is made of metal, and the degree of corrosion, which indicates the degree to which the metal fittings housed in each of the two structures are corroded, the degree of deterioration, which indicates whether or not the connecting member is deteriorated, is determined. A determination method for outputting the aforementioned degree of deterioration. [Additional note 6] A non-temporary storage medium storing a program executable by a computer, the non-temporary storage medium storing a program that causes the computer to function as a determination device described in any one of the appendices 1 to 4. 【0122】 All documents, patent applications, and technologies described herein are incorporated by reference to the same extent as if each individual document, patent application, and technology were specifically and individually described as being incorporated by reference. 【0123】 Although the embodiments described above are representative examples, it will be apparent to those skilled in the art that many modifications and substitutions are possible within the spirit and scope of this disclosure. Therefore, the present invention should not be construed as being limited by the embodiments described above, and various modifications or changes are possible without departing from the claims. [Explanation of symbols] 【0124】 1 Judgment device 11 Input section 12 Storage section 13. Identification Information Assignment Unit 14 Deterioration determination section 15 Output section 21 transmission towers 22 Communications building 23. Communication equipment 24 Tunnel 25 Bridges 26 utility poles 27 Terminal box 141 Depth determination section 142 Corrosion Degree Determination Section 143 Judgment section 301 Computer 310 Processor 320 ROM 330 RAM 340 storage 350 Input section 360 Output section 370 Communication Interfaces 380 bus

Claims

[Claim 1] An input unit that receives inputs for the depth from the ground surface at each of the multiple structures that define the internal space, and the degree of corrosion indicating the degree to which the metal fittings housed in each of the multiple structures are corroded, A deterioration determination unit determines whether or not the connecting member is deteriorated, based on the depth from the ground surface of each of the two structures that are connected to each other by a connecting member, at least a part of which is made of metal, and the degree of corrosion, which indicates the degree to which the metal fittings housed in each of the two structures are corroded. An output unit that outputs the degree of deterioration, A determination device equipped with the following features. [Claim 2] The aforementioned deterioration determination unit is A corrosion degree determination unit determines whether the difference in corrosion degree between two metal fittings housed in each of the two structures is greater than or equal to a corrosion degree threshold, and if the difference in corrosion degree is greater than or equal to the corrosion degree threshold, it determines which of the two metal fittings has a greater degree of corrosion. A depth determination unit determines whether the depth difference, which is the difference in depth between the two structures, is greater than or equal to a depth threshold, and if it is determined that the depth difference is greater than or equal to a depth threshold, it determines which of the two structures has a greater depth. A determination device according to claim 1, comprising: a determination unit that determines if the corrosion degree difference is less than the corrosion degree threshold, determines that the communicating member is not deteriorated; if the corrosion degree difference is greater than or equal to the corrosion degree threshold, determines whether the depth difference is greater than or equal to the depth threshold; if the depth difference is less than the depth threshold, determines that the communicating member may be deteriorated; if the depth difference is greater than or equal to the depth threshold, determines that the metal fitting housed in the structure with the greater depth of the two structures is highly corroded, determines that the communicating member is deteriorated; and if the metal fitting housed in the structure with the smaller depth of the two structures is highly corroded, determines that the communicating member may be deteriorated. [Claim 3] The determination device according to claim 1 or 2, further comprising an identification information assigning unit that assigns identification information consisting of a main number and a sub-number to one of the plurality of structures, assigns the same identification information as that assigned to the one structure to a connecting member that connects the internal space of the one structure to the internal space of another structure, and assigns identification information to the other structures consisting of the same main number as that which constitutes the identification information assigned to the one structure, and a sub-number obtained by adding 1 to the sub-number that constitutes the identification information. [Claim 4] The determination device according to claim 3, wherein, if the internal space of one structure is in communication with the internal spaces of each of the multiple structures to which the identification information has not been assigned, the identification information assigning unit assigns to the one structure an additional identification information consisting of the first structure among the multiple structures which is one of the other structures, and further assigns to the one structure an additional identification information consisting of the smallest integer not used as the main number which is one of the main numbers [Claim 5] A determination method performed by a determination device, The process involves receiving inputs for the depth from the ground surface at each of the multiple structures that define the internal space, and the degree of corrosion indicating the degree to which the metal fittings housed in each of the multiple structures are corroded. A step of determining whether or not the connecting member is deteriorated, based on the depth from the ground surface of each of the two structures that are connected to each other by a connecting member, at least a part of which is made of metal, and the degree of corrosion, which indicates the degree to which the metal fittings housed in each of the two structures are corroded. The steps include outputting the degree of deterioration, A determination method that includes this. [Claim 6] A program for causing a computer to function as a determination device according to claim 1 or 2.

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