JP7606701B2 - Pipeline extraction device, pipeline extraction method, and program - Google Patents

Description

The present invention relates to a pipeline extraction device, a pipeline extraction method, and a program.

Conventionally, one method for inspecting whether underground pipelines have been damaged after an earthquake is to conduct a pass-through test using a test piece (mandrel) on pipelines belonging to areas where road surface abnormalities have been confirmed visually, or pipelines belonging to stations in areas where cable failures have been confirmed (Non-Patent Document 1). In addition, a screening method has been proposed that classifies the susceptibility to damage using information indicating damage data, peak ground velocity (PGV), pipe type, length, microtopography, etc., and predicts damage on a macro level (Non-Patent Document 2). Patent Document 1 also discloses a method of acquiring photographic images of the inside of pipelines using a pipeline facility inspection aircraft and visually inspecting the images.

Patent No. 6681173

Yasuji Yamazaki and 3 others, "Considerations on the damage situation of telecommunication civil engineering facilities in the Great East Japan Earthquake," Journal of the Japan Association for Earthquake Engineering, Vol. 12, No. 5, pp. 55-68, 2012. Manabu Shoji et al., "Proposal of a Screening Method for Earthquake Countermeasures of Buried Telecommunication Pipes and Construction of Earthquake Damage Functions," Journal of the Japan Society of Civil Engineers, Proceedings of the Society of Civil Engineers, A1 (Structural and Earthquake Engineering), Journal of Earthquake Engineering 2016, Vol. 72, No. 4, pp. I_523-I_541, 2016.

However, when using methods to visually check for changes in road surface, it is difficult to determine whether areas where minor cracks have occurred on the ground surface have been changed by the earthquake, and even in areas where there is no visible change in the road surface, there are areas where damage has occurred. Furthermore, in order to get a broad grasp of the damage, it was necessary to enter many manholes where no damage had occurred and inspect them using mandrels, etc. Screening methods that predict damage on a macro level had limited accuracy, and the locations and number of damaged areas in the pipelines were unknown. As such, there was room for improvement in the methods for inspecting pipelines after an earthquake.

In view of the above circumstances, the object of the present invention is to provide a pipeline extraction device, a pipeline extraction method, and a program that can improve pipeline inspection techniques.

In order to solve the above-mentioned problems, the pipeline extraction device according to the present invention is a pipeline extraction device that includes a control unit, and the control unit includes a pipeline position information acquisition unit that acquires pipeline position information indicating the buried position of the pipeline, a ground surface displacement information acquisition unit that acquires ground surface displacement information indicating the displacement of the ground surface at the buried position, a pipeline displacement amount calculation unit that calculates the amount of displacement of the pipeline based on the pipeline position information and the ground surface displacement information, and a pipeline extraction unit that extracts the pipeline as a pipeline to be inspected based on whether the amount of displacement is equal to or greater than a reference value.

The pipeline extraction method according to the present invention is a pipeline extraction method executed by a pipeline extraction device, and includes the steps of acquiring pipeline position information indicating the buried position of the pipeline, acquiring ground surface displacement information indicating the displacement of the ground surface at the buried position, calculating the amount of displacement of the pipeline based on the pipeline position information and the ground surface displacement information, and extracting the pipeline as a pipeline to be inspected based on whether the amount of displacement is equal to or greater than a reference value.

The program according to the present invention also causes a computer to function as the pipeline extraction device according to the present invention.

The present invention provides a pipeline extraction device, a pipeline extraction method, and a program that can improve pipeline inspection techniques.

1 is a block diagram showing a configuration of a pipeline extraction device according to an embodiment of the present invention; 11 is a diagram for explaining the relative displacement amount of partial pipelines. FIG. 11 is a diagram for explaining a relative displacement amount resolved into a first component and a second component. FIG. FIG. 13 is a diagram for explaining an example of a durability test in a direction perpendicular to the pipe axis of a pipe. FIG. 13 is a diagram showing the relationship between the stress generated in a pipeline during a durability test and the input ground displacement. 5 is a diagram illustrating an operation of the pipeline extraction device according to the embodiment of the present invention. FIG.

The following describes an embodiment of the present invention with reference to the drawings. The embodiment described below is an example of the configuration of the present invention, and the present invention is not limited to the following embodiment.

<Configuration of Pipeline Extraction Device 10>
The configuration of a pipeline extraction device 10 according to this embodiment will be described with reference to Fig. 1. The pipeline extraction device 10 includes a control unit 11, a storage unit 12, a communication unit 13, an input unit 14, and an output unit 15.

The control unit 11 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), may be configured by a processor, or may be configured to include both. The control unit 11 executes processing related to the operation of the pipeline extraction device 10 while controlling each part of the pipeline extraction device 10. The control unit 11 can send and receive information to and from external devices via the communication unit 13 and a network.

The control unit 11 includes a pipeline position information acquisition unit 111, a ground surface displacement information acquisition unit 112, a pipeline division unit 113, a pipeline displacement amount calculation unit 114, an element decomposition unit 115, a pipe type information acquisition unit 116, and a pipeline extraction unit 117.

The pipeline position information acquisition unit 111 acquires pipeline position information indicating the buried position of the pipeline 20. Here, the pipeline 20 is, for example, a communication pipeline that protects a communication cable, is buried underground, and connects manholes. The pipeline 20 may be a water pipeline, a gas pipeline, an electricity pipeline, etc. One span between manholes is a unit of the pipeline 20.

Specifically, the pipeline position information is coordinate information of the pipeline 20 including latitude and longitude. The target pipeline 20 may be a pipeline included in a range on a map specified by the user via the input unit 14. There may be multiple target pipelines 20. Any method can be used to acquire the pipeline position information. For example, the pipeline position information acquisition unit 111 may acquire pipeline position information obtained by GNSS (Global Navigation Satellite System) surveying from an external device. The pipeline position information acquisition unit 111 may acquire pipeline position information from the storage unit 12. The pipeline position information acquisition unit 111 may constantly acquire pipeline position information. The pipeline position information acquisition unit 111 stores the acquired pipeline position information in the storage unit 12.

The ground surface displacement information acquisition unit 112 acquires ground surface displacement information indicating the displacement of the ground surface at the buried position of the pipeline 20. The ground surface displacement information is information indicating the difference in the position of the ground surface before and after the occurrence of an earthquake, measured as a three-dimensional displacement including magnitude and direction. The ground surface displacement information acquisition unit 112 can acquire the ground surface displacement information automatically after the occurrence of an earthquake or in response to a user command.

Any method can be adopted to acquire information indicating the displacement of the ground surface. For example, the ground surface displacement information acquisition unit 112 may acquire a synthetic aperture radar (SAR) image as the ground surface displacement information from an external device. Without being limited to this, the ground surface displacement information may be information created using a mobile mapping system, optical laser surveying, or a device for investigating the shape of the road surface. The ground surface displacement information may be information created by converting an image taken from the air by an unmanned aerial vehicle into three-dimensional data. The device for investigating the shape of the road surface is disclosed in, for example, Reference 1 below, and therefore will not be described here.
[Reference 1]
Patent No. 6154001

The ground surface displacement information acquisition unit 112 outputs the acquired ground surface displacement information to the pipeline displacement amount calculation unit 114.

The pipeline division unit 113 defines a plurality of partial pipelines by dividing the pipeline 20. The pipeline division unit 113 may define N partial pipelines. Here, N is any natural number. The value of N may be freely set by the user. The pipeline division unit 113 may define partial pipelines over the entire pipeline 20, or may define partial pipelines for only a part of the pipeline 20. FIG. 2A shows an example in which the pipeline division unit 113 defines partial pipelines by dividing the entire pipeline 20. Referring to FIG. 2A, the pipeline 20 from the manhole M1 to the manhole M2 is defined as Pi partial pipelines from partial pipeline P1 to partial pipeline Pi. The pipeline division unit 113 outputs information indicating the defined partial pipelines to the pipeline displacement amount calculation unit 114.

The pipeline displacement amount calculation unit 114 refers to the memory unit 12 to read the pipeline position information, and calculates the amount of displacement of the pipeline 20 based on the pipeline position information and the ground surface displacement information. Specifically, the pipeline displacement amount calculation unit 114 associates the coordinates of the buried position of the pipeline 20 indicated by the pipeline position information with the coordinates of the ground surface before the earthquake indicated by the ground surface displacement information, and sets them as a reference point on the three-dimensional coordinates of the pipeline 20. Furthermore, the displacement that occurred on the ground surface after the earthquake indicated by the ground surface displacement information is superimposed so as to be a displacement from the reference value, and a displacement vector extending from the reference point is generated. In this way, the pipeline displacement amount calculation unit 114 calculates the amount of displacement of the pipeline 20.

In this embodiment, the pipeline displacement amount calculation unit 114 calculates the amount of displacement for each of the partial pipelines defined by the pipeline division unit 113, and calculates the difference in the amount of displacement between adjacent partial pipelines as the amount of relative displacement. With reference to FIG. 2A, the relative displacement amount calculated by the pipeline displacement amount calculation unit 114 for each of the first partial pipeline P1 to the i-th partial pipeline P _i , counting from one manhole M1 which is an end of the pipeline 20, is indicated by solid arrows. The pipeline displacement amount calculation unit 114 calculates the difference between the displacement amount U _i of the i-th partial pipeline P _i and the displacement amount U i-1 of the i-1-th partial pipeline P _{i-1 adjacent} to the partial pipeline P i as the relative displacement amount ΔU _i . In terms of the formula, the relative displacement amount ΔU _i can be found as follows.
ΔU _i =U _i -U _i-1
Here, _U0 is the displacement at the manhole M1 at the end of the pipeline 20.

For example, the displacement amount U _i of the i-th partial pipeline P _i is expressed as U _i = (x _i , yi, z _i ) using three-dimensional displacement information (x-direction displacement x i , y-direction displacement _{y i} , z-direction displacement z _i ), and the displacement amount U _i-1 of the i-1-th partial pipeline P _i-1 is expressed as U _i-1 = (x _i-1 , y _i-1 , z _i-1 ). Therefore, from the above formula, the relative displacement amount ΔU _i is calculated as ΔU i = (x _{i -} x _i-1 , y _{i -} y _i-1 , z _{i -} z _i-1 ). Similarly, for each of the other partial pipelines in FIG. 2A, the pipeline displacement amount calculation unit 114 calculates the difference in the displacement amount of adjacent partial pipelines as the relative displacement amount. The pipeline displacement amount calculation unit 114 outputs each of the calculated relative displacement amounts to the element decomposition unit 115 .

The element decomposition unit 115 decomposes the relative displacement amount into a first component in the tube axis direction and a second component in the tube axis perpendicular direction, and determines the partial pipe line in which the displacement amount of the first component or the second component is maximum as the maximum relative displacement part. As shown in FIG. 2B, the element decomposition unit 115 decomposes the relative displacement amount ΔU _i-1 of the partial pipe line P _i-1 in FIG. 2A into a first component H _i-1 in the tube axis direction and a second component V _i-1 in the tube axis perpendicular direction. The dashed arrow in FIG. 2B indicates the displacement amount of the partial pipe line P _i-1 . Similarly, for each of the other partial pipe lines in FIG. 2A, the element decomposition unit 115 decomposes the relative displacement amount into a first component in the tube axis direction and a second component in the tube axis perpendicular direction.

The element decomposition unit 115 determines the first component with the maximum magnitude, i.e., the maximum displacement amount, as H max and the second component as V _max among the first component in the tube axis direction and the second component in the tube _axis perpendicular direction of each of the partial pipes P1 to P i. Then, the element decomposition unit 115 determines the partial pipe having the relative displacement amount including the first component _{H max or} the second component V _max as the maximum relative displacement portion. For example, among the partial pipes in FIG. 2A, the first component H _{i-1 in} the tube axis direction and the second component V _i-1 in the tube axis perpendicular direction of the relative displacement amount ΔU i-1 of the partial pipe P _{i-1 are both maximum. At this time, the element decomposition unit 115 determines the first component H i} -1 in the tube axis direction and the second component V _i-1 in the tube axis perpendicular direction of the relative displacement amount ΔU _{i -1} as H _max and V _max , respectively, and determines the partial pipe P _i-1 as the maximum relative displacement portion. In FIG. 2A, the partial pipe line indicated by the double circle is the partial pipe line determined as the maximum relative displacement portion.

When a partial pipeline having a relative displacement amount including the first component _Hmax and a partial pipeline having a relative displacement amount including the second component _Vmax are different, the element decomposition unit 115 may determine both partial pipelines as the maximum relative displacement section, or may determine only one of them as the maximum relative displacement section.

The element decomposition unit 115 outputs the determined displacement amounts of the first component H _max and the second component V _max to the pipeline extraction unit 117 .

The element decomposition unit 115 may be able to approximate the relative displacement amount with a straight line when the divided portion of the pipe 20 is curved in the pipe axial direction, and decompose the relative displacement amount into a first component or a second component. The straight line approximation may be performed by any processing method.

The pipe type information acquisition unit 116 acquires pipe type information indicating the type of the pipeline 20. The type of pipeline 20 includes, for example, rigid polyvinyl chloride pipes. The pipe type information may further include information indicating the presence or absence of joints, the presence or absence of protective concrete around the pipeline 20, the year of construction of the pipeline 20, etc. Any method can be used to acquire the pipe type information. For example, the pipe type information acquisition unit 116 may acquire the pipe type information from the memory unit 12, or may acquire it from an external device. The pipe type information acquisition unit 116 outputs the acquired pipe type information to the pipeline extraction unit 117.

The pipeline extraction unit 117 extracts the pipeline 20 as a pipeline to be inspected based on whether the displacement amount is equal to or greater than a reference value. In this embodiment, the pipeline extraction unit 117 extracts the pipeline 20 as a pipeline to be inspected based on whether the displacement amount of the first component _Hmax or the second component _Vmax of the maximum relative displacement portion is equal to or greater than a reference value corresponding to the type of the pipeline 20.

The reference value may be set based on data obtained by previously conducting a durability test to investigate the durable displacement of the pipeline 20. In the durability test, the response when ground displacement is input in each of the pipe axis direction and the pipe axis perpendicular direction is analyzed for each pipe type. The durability test may include a tensile test, a compression test, and a bending test. Separate analyses may be performed for the durability test on the pipeline 20 having the joint portion 22 and the pipeline 20 not having the joint portion 22. Separate analyses may also be performed on the pipe portion 21 and the joint portion 22 of the pipeline 20. FIG. 3A shows a simplified view of a durability test in the pipe axis perpendicular direction for the pipeline 20 having the joint portion 22. When ground displacement is input at the position indicated by the black arrow in FIG. 3A, stress is concentrated and generated at the end of the pipe portion 21 on the joint portion 22 side, indicated by the white arrow.

3B is a graph showing the relationship between the stress (vertical axis) generated in the pipeline 20 in the durability test of FIG. 3A and the input ground displacement (horizontal axis). The durable stress in FIG. 3B indicates the stress generated at the time when the pipeline 20 breaks in the durability test, and the durable displacement indicates the ground displacement at the time when the pipeline 20 breaks. In this embodiment, at least one of the durable stress and the durable displacement is set as a reference value. The memory unit 12 may store information indicating the reference value as reference value information in a table format. An example of the reference value information is shown in Table 1 below. As shown in Table 1, the reference value information includes two types, that is, the pipe axis direction and the pipe axis perpendicular direction. For example, if the pipe type of the pipeline P _i-1 is A and the displacement amount of the first component H _max of the pipeline P _i-1 is X ₁ mm or more, or the displacement amount of the second component V _max is Y ₁ mm or more, the pipeline extraction unit 117 extracts the pipeline P _i-1 as a pipeline to be inspected.

As shown in the following reference, when ground displacement is input in both the tube axial direction and the tube-axis-perpendicular direction, the tolerable displacement may change. Therefore, the reference value is not limited to the above Table 1, and may be set in a combination of the tube axial direction and the tube-axis-perpendicular direction.
[Reference 2]
Masato Wakatake and two others, "Study on the fracture conditions of steel pipe threaded joints for telecommunication through various experiments," Journal of Earthquake Engineering, Japan Society of Civil Engineers, Vol. 36, 2017

The reference value may be set in accordance with information such as the type of pipe, the presence or absence of joints 22, the presence or absence of protective concrete around the pipeline 20, and the year of construction. This allows the pipeline extraction unit 117 to compare the amount of displacement of the maximum relative displacement part with the corresponding reference value depending on the information about the pipeline 20.

When there are multiple target pipelines 20, the pipeline extraction unit 117 determines whether the displacement amount of the maximum relative displacement part for each of the pipelines 20 is equal to or greater than the reference value.

The pipeline extraction unit 117 stores the extracted pipeline 20 in the memory unit 12.

The storage unit 12 includes one or more memories, and may include, for example, a semiconductor memory, a magnetic memory, an optical memory, etc. Each memory included in the storage unit 12 may function, for example, as a main memory device, an auxiliary memory device, or a cache memory. The storage unit 12 stores any information used in the operation of the pipeline extraction device 10. The storage unit 12 does not necessarily need to be provided inside the pipeline extraction device 10, and may be configured to be provided outside the pipeline extraction device 10.

The communication unit 13 includes at least one communication interface. The communication interface is, for example, a LAN interface. The communication unit 13 receives information used in the operation of the pipeline extraction device 10, and transmits information obtained by the operation of the pipeline extraction device 10.

The communication unit 13 enables the pipeline extraction device 10 to transmit and receive information to and from other devices via a network. The network includes the Internet, at least one Wide Area Network (WAN), at least one Metropolitan Area Network (MAN), or a combination of these. The network may include at least one wireless network, at least one optical network, or a combination of these. The wireless network is, for example, an ad-hoc network, a cellular network, a wireless Local Area Network (LAN), a satellite communication network, or a terrestrial microwave network.

The input unit 14 includes at least one input interface. The input interface is, for example, a physical key, a capacitive key, a pointing device, a touch screen integral with a display, or a microphone. The input unit 14 accepts an operation to input information used in the operation of the pipeline extraction device 10. The input unit 14 may be connected to the pipeline extraction device 10 as an external input device instead of being provided in the pipeline extraction device 10. 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.

The output unit 15 includes at least one output interface. The output interface is, for example, a display or a speaker. The display is, for example, an LCD (Liquid Crystal Display) or an organic EL (Electro Luminescence) display. The output unit 15 outputs information obtained by the operation of the pipeline extraction device 10. The output unit 15 may be connected to the pipeline extraction device 10 as an external output device instead of being provided in the pipeline extraction device 10. As a connection method, any method such as USB, HDMI (registered trademark), or Bluetooth (registered trademark) can be used. The output unit 15 can output information indicating the pipeline 20 extracted by the pipeline extraction unit 117 in the form of audio or video. For example, the output unit 15 may display the extracted pipeline 20 on a map.

<Program>
A computer capable of executing program instructions can be used to function as the above-described pipe extraction device 10. Here, the computer may be a general-purpose computer, a dedicated computer, a workstation, a personal computer (PC), an electronic notepad, etc. The program instructions may be program code, code segments, etc. for performing the necessary tasks.

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

The program may be recorded on a computer-readable recording medium. By using such a recording medium, the program can be installed on 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, or a USB memory. In addition, the program may be in a form that is downloaded from an external device via a network.

Next, the operation of the pipeline extraction device 10 according to this embodiment will be described with reference to Figures 2A, 2B, 3A, 3B, and 4. The operation of the pipeline extraction device 10 corresponds to the pipeline extraction method according to this embodiment. Figure 4 shows an example of the operation of the pipeline extraction device 10.

In step S101 of FIG. 4, the pipeline position information acquisition unit 111 of the pipeline extraction device 10 acquires pipeline position information indicating the buried position of the pipeline 20. Any method can be used to acquire the pipeline position information. For example, the pipeline position information acquisition unit 111 may acquire pipeline position information measured by GNSS surveying from an external device. The pipeline position information acquisition unit 111 stores the acquired pipeline position information in the memory unit 12.

In step S102, the ground surface displacement information acquisition unit 112 acquires ground surface displacement information indicating the displacement of the ground surface at the buried position of the pipeline 20. The ground surface displacement information acquisition unit 112 can acquire the ground surface displacement information automatically after the occurrence of an earthquake or in response to a user's command. Any method can be used to acquire information indicating the displacement of the ground surface. For example, the ground surface displacement information acquisition unit 112 may acquire a synthetic aperture radar image as the ground surface displacement information from an external device. The ground surface displacement information acquisition unit 112 outputs the acquired ground surface displacement information to the pipeline displacement amount calculation unit 114.

In step S103, the pipeline division unit 113 divides the pipeline 20 to define a plurality of partial pipelines. The pipeline division unit 113 may define N partial pipelines. The pipeline division unit 113 may be able to define partial pipelines over the entire pipeline 20, or may be able to define partial pipelines for only a portion of the pipeline 20. FIG. 2A shows an example in which the pipeline division unit 113 divides the entire pipeline 20 to define partial pipelines. The pipeline division unit 113 outputs information indicating the defined partial pipelines to the pipeline displacement amount calculation unit 114.

In step S104, the pipeline displacement amount calculation unit 114 reads out the pipeline position information by referring to the storage unit 12, and calculates the displacement amount of the pipeline 20 based on the pipeline position information and the ground surface displacement information. In this embodiment, the pipeline displacement amount calculation unit 114 calculates the displacement amount for each partial pipeline, and calculates the difference in the displacement amounts of adjacent partial pipelines as the relative displacement amount. With reference to FIG. 2A, the relative displacement amount calculated by the pipeline displacement amount calculation unit 114 for each of the first partial pipeline P1 to the i-th partial pipeline P _i , counting from one manhole M1 which is an end of the pipeline 20, is indicated by a solid arrow. The pipeline displacement amount calculation unit 114 calculates the difference between the displacement amount U _i of the i-th partial pipeline P _i and the displacement amount U _i- 1 of the i-1-th partial pipeline P _i-1 adjacent to the partial pipeline P i as the relative displacement amount ΔU _i . The pipeline displacement amount calculation unit 114 outputs each of the calculated relative displacement amounts to the element decomposition unit 115 .

In step S105, the element decomposition unit 115 decomposes the relative displacement amount into a first component in the tube axis direction and a second component in the tube axis perpendicular direction, and determines the partial pipe line in which the displacement amount of the first component or the second component is maximum as the maximum relative displacement part. As shown in FIG. 2B, the element decomposition unit 115 decomposes the relative displacement amount ΔU _i-1 of the partial pipe line P _i-1 in FIG. 2A into a first component H _i-1 in the tube axis direction and a second component V _i-1 in the tube axis perpendicular direction. The dashed arrow in FIG. 2B indicates the displacement amount of the partial pipe line P _i-1 . Similarly, for each of the other partial pipe lines in FIG. 2A, the element decomposition unit 115 decomposes the relative displacement amount into a first component in the tube axis direction and a second component in the tube axis perpendicular direction.

The element decomposition unit 115 determines the first component with the largest magnitude, i.e., the largest displacement amount, as _Hmax and the second component as _Vmax among the first component in the tube axis direction and the second component in the tube axis perpendicular direction of each of the partial pipes P1 to Pi. Then, the element decomposition unit 115 determines the partial pipe having the largest relative displacement amount including the first component _Hmax or the second component _Vmax as the maximum relative displacement portion. The element decomposition unit 115 outputs the determined displacement amounts of the first component _Hmax and the second component _Vmax to the pipe extraction unit 117.

The element decomposition unit 115 may be able to approximate the relative displacement amount with a straight line when the divided portion of the pipe 20 is curved in the pipe axial direction, and decompose the relative displacement amount into a first component or a second component. The straight line approximation may be performed by any processing method.

In step S106, the pipe type information acquisition unit 116 acquires pipe type information indicating the type of the pipeline 20. Any method can be used to acquire the pipe type information. For example, the pipe type information acquisition unit 116 may acquire the pipe type information from the storage unit 12, or from an external device. The pipe type information acquisition unit 116 outputs the acquired pipe type information to the pipeline extraction unit 117.

In step S107, the pipeline extraction unit 117 determines whether the displacement amount is equal to or greater than a reference value. In this embodiment, the pipeline extraction unit 117 determines whether the displacement amount of the first component H _max or the second component V _max of the maximum relative displacement portion is equal to or greater than a reference value corresponding to the type of the pipeline 20. If the displacement amount of the first component H _max or the second component V _max of the maximum relative displacement portion is less than the reference value corresponding to the type of the pipeline 20, the operation of the pipeline extraction device 10 ends. If the displacement amount of the first component H _max or the second component V _max is equal to or greater than the reference value corresponding to the type of the pipeline 20, the operation of the pipeline extraction device 10 proceeds to step 108. If there are multiple target pipelines 20, the pipeline extraction unit 117 determines whether the displacement amount of the first component H _max or the second component V _max of the maximum relative displacement portion is equal to or greater than a reference value for all of the pipelines 20.

The reference value may be set based on data obtained by conducting a durability test in advance to investigate the durable displacement of the pipeline 20. The reference value is a value obtained by analyzing the durable stress or durable displacement of the pipeline 20 in two directions, the pipe axis direction and the direction perpendicular to the pipe axis. The reference value may be set in combination with the pipe axis direction and the direction perpendicular to the pipe axis. The reference value may be set in response to information such as the type of pipe, the presence or absence of a joint 22, the presence or absence of protective concrete around the pipeline 20, and the year of construction.

In step S108, the pipeline extraction unit 117 extracts the pipeline 20 as a pipeline to be inspected. The pipeline extraction unit 117 stores the extracted pipeline 20 in the memory unit 12.

As shown in steps S107 and S108, the pipeline extraction unit 117 extracts the pipeline 20 as a pipeline to be inspected based on whether the displacement amount is equal to or greater than a reference value. In this embodiment, the pipeline extraction unit 117 extracts the pipeline 20 as a pipeline to be inspected based on whether the displacement amount of the first component _Hmax or the second component _Vmax of the maximum relative displacement portion is equal to or greater than a reference value corresponding to the type of the pipeline 20.

In step S109, the output unit 15 refers to the memory unit 12 and reads out the pipeline 20 extracted by the pipeline extraction unit 117. The output unit 15 outputs information indicating the read out pipeline 20 in the form of audio or video. For example, the output unit 15 may display the extracted pipeline 20 on a map. Thereafter, the operation of the pipeline extraction device 10 ends.

As described above, the pipeline extraction device 10 according to this embodiment is a pipeline extraction device including a control unit 11, and the control unit 11 includes a pipeline position information acquisition unit 111 that acquires pipeline position information indicating the buried position of the pipeline 20, a ground surface displacement information acquisition unit 112 that acquires ground surface displacement information indicating the displacement of the ground surface at the buried position, a pipeline displacement amount calculation unit 114 that calculates the amount of displacement of the pipeline 20 based on the pipeline position information and the ground surface displacement information, and a pipeline extraction unit 117 that extracts the pipeline 20 as a pipeline to be inspected based on whether the amount of displacement is equal to or greater than a reference value.

According to this embodiment, the pipelines 20 to be inspected can be narrowed down based on accurate pipeline position information and ground surface displacement information obtained by ground or satellite surveying. In other words, it becomes easy to quickly and accurately grasp damage predictions for the entire pipeline 20. Since the pipelines 20 to be inspected can be screened without entering the tunnel, inspection costs can be reduced. Therefore, the pipeline inspection method can be improved.

As described above, in the pipeline extraction device 10 according to this embodiment, the pipeline extraction unit 117 extracts the pipeline 20 as a pipeline to be inspected based on whether the amount of displacement is equal to or greater than a reference value corresponding to the type of pipeline 20.

According to this embodiment, the amount of displacement of the pipeline 20 can be compared with the corresponding reference value depending on information about the pipeline 20, such as the type of pipeline and the presence or absence of a joint 22, so that the pipeline 20 can be extracted as a pipeline to be inspected with greater accuracy. This allows for improved pipeline inspection methods.

As described above, in the pipeline extraction device 10 according to this embodiment, the control unit 11 further includes a pipeline division unit 113 and an element decomposition unit 115. The pipeline division unit 113 divides the pipeline 20 to define a plurality of partial pipelines. The pipeline displacement calculation unit 114 calculates the displacement amount for each partial pipeline and calculates the difference between the displacement amounts of adjacent partial pipelines as the relative displacement amount. The element decomposition unit 115 decomposes the relative displacement amount into a first component in the pipe axis direction and a second component in the direction perpendicular to the pipe axis, and determines the partial pipeline in which the displacement amount of the first component or the second component is maximum as the maximum relative displacement part. The pipeline extraction unit 117 extracts the pipeline 20 as the pipeline to be inspected based on whether the displacement amount of the first component or the previous second component of the maximum relative displacement part is equal to or greater than a reference value.

According to this embodiment, the relative displacement amount for each partial pipeline is calculated, and if the relative displacement amount is equal to or greater than a reference value, the pipeline 20 can be extracted as it is highly likely that damage has occurred. Also, if the entire pipeline 20 is displaced uniformly, it can be determined that the pipeline 20 is unlikely to have been damaged and therefore not to be extracted. In this way, the pipeline to be inspected can be extracted with greater accuracy, thereby improving the pipeline inspection method.

As described above, in the pipeline extraction device 10 according to this embodiment, when a partial pipeline is curved, the element decomposition unit 115 approximates it with straight lines and decomposes it into a first component or a second component.

According to this embodiment, when the pipeline 20 is buried in a curved detour near a building or the like, accurate first or second components can be obtained even for curved partial pipelines by approximating the pipeline with a straight line. Since the first or second component can be obtained for all partial pipelines, including curved partial pipelines, the maximum relative displacement part can be determined with greater accuracy, and the pipeline to be inspected can be extracted. This makes it possible to improve the inspection method for pipelines.

Although the present invention has been described based on the drawings and embodiments, it should be noted that a person skilled in the art would easily be able to make various modifications and corrections based on the present invention. Therefore, it should be noted that these modifications and corrections are included within the scope of the present invention.

(Variation 1)
As a modified example of the present disclosure, the control unit 11 may not include the pipeline division unit 113 and the element decomposition unit 115, and the pipeline 20 may be extracted as a pipeline to be inspected based on whether the displacement amount of the entire pipeline 20 is equal to or greater than a reference value.

In this modified example, the pipeline position information acquisition unit 111 outputs the acquired pipeline position information to the pipeline displacement amount calculation unit 114. The pipeline displacement amount calculation unit 114 calculates the amount of displacement of the pipeline 20 based on the pipeline position information and the ground surface displacement information, and outputs the amount of displacement to the pipeline extraction unit 117.

The pipeline extraction unit 117 extracts the pipeline 20 as a pipeline to be inspected based on whether the displacement of the pipeline 20 is equal to or greater than a reference value.

According to this modified example, when the length of the pipeline 20 to be inspected is shorter than a predetermined length, the amount of displacement can be calculated easily without specifying partial pipelines of the pipeline 20. This reduces the calculation load on the pipeline extraction device 10, and improves the pipeline inspection method.

(Variation 2)
As a modified example of the present disclosure, the output section 15 may be capable of outputting information indicating the amount of relative displacement of each of the partial pipelines, and position information indicating the position of the partial pipeline determined as the maximum relative displacement section.

This allows the user to recognize the relative displacement of each partial pipeline and create an efficient inspection plan for pipeline 20. For example, the user can sort the partial pipelines in descending order of relative displacement and create an inspection plan. This allows for improved pipeline inspection methods.

REFERENCE SIGNS LIST 10 Pipeline extraction device 11 Control unit 12 Memory unit 13 Communication unit 14 Input unit 15 Output unit 20 Pipeline 21 Pipe body unit 22 Joint unit 111 Pipeline position information acquisition unit 112 Ground surface displacement information acquisition unit 113 Pipeline division unit 114 Pipeline displacement amount calculation unit 115 Element decomposition unit 116 Pipe type information acquisition unit 117 Pipeline extraction unit

Claims (6)

A pipeline extraction device including a control unit, the control unit comprising:
a pipeline position information acquisition unit that acquires pipeline position information indicating coordinates of an embedded position of the pipeline;
a ground surface displacement information acquisition unit that acquires ground surface displacement information indicating displacement of the ground surface at the buried position before and after the occurrence of an earthquake ;
A pipeline dividing section that divides the pipeline into a plurality of partial pipelines;
a pipeline displacement amount calculation unit that estimates the displacement amount of each of the partial pipelines by calculating a displacement vector extending from the reference point, the displacement vector having the same magnitude and direction as the displacement indicated by the ground surface displacement information corresponding to the reference point, and calculates a difference in the displacement amounts of adjacent partial pipelines as a relative displacement amount ;
an element decomposition unit that decomposes the amount of relative displacement into a first component in a tube axis direction and a second component in a direction perpendicular to the tube axis, and determines, among the partial pipes, a partial pipe in which the amount of displacement of the first component or the second component is maximum as a maximum relative displacement portion;
a pipeline extraction unit that extracts the pipeline as an inspection target pipeline based on whether the displacement amount of the first component or the second component of the maximum relative displacement portion is equal to or greater than a reference value;
A pipeline extraction device comprising: A pipe type information acquisition unit that acquires pipe type information indicating a type of a pipe line is further provided,
The pipeline extraction device according to claim 1 , wherein the pipeline extraction unit extracts the pipeline as a pipeline to be inspected based on whether the amount of displacement is equal to or greater than a reference value corresponding to a type of the pipeline. The pipeline extraction device according to claim 1 , wherein, when the partial pipeline is curved, the element decomposition unit approximates the partial pipeline with a straight line and decomposes the amount of relative displacement into the first component or the second component. A pipeline extraction method executed by a pipeline extraction device, comprising:
acquiring pipeline position information indicating coordinates of an embedded position of the pipeline;
acquiring ground surface displacement information indicating displacement of the ground surface at the buried position before and after the occurrence of an earthquake ;
dividing the pipeline into a plurality of sub-pipe sections;
a step of estimating a displacement amount of each of the partial pipelines by setting the coordinates of the buried position indicated by the pipeline position information as a reference point and calculating a displacement vector extending from the reference point having the same magnitude and direction as the displacement indicated by the ground surface displacement information corresponding to the reference point;
calculating a difference between the displacement amounts of the adjacent partial pipelines as a relative displacement amount;
a step of decomposing the amount of relative displacement into a first component in a tube axis direction and a second component in a direction perpendicular to the tube axis, and determining, among the partial pipes, a partial pipe in which the amount of displacement of the first component or the second component is maximum as a maximum relative displacement portion;
extracting the pipeline as an inspection target pipeline based on whether the displacement amount of the first component or the second component of the maximum relative displacement portion is equal to or greater than a reference value;
A pipeline extraction method comprising: The method further includes a step of acquiring pipe type information indicating a type of the pipe,
The pipeline extraction method according to claim 4 , wherein the extracting step further includes a step of extracting the pipeline as a pipeline to be inspected based on whether the amount of displacement is equal to or greater than a reference value corresponding to a type of the pipeline. A program for causing a computer to function as the pipeline extraction device according to any one of claims 1 to 3 .

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