Weak point determination device, weak point determination method, and program

Abstract

To provide a technique for improving a method for identifying weak points in an underground structure.SOLUTION: A weak point determining device 10 for determining weak points in an underground area including a first underground structure, a second underground structure, and a third underground structure comprises: a first calculation section 111 acquiring first contact area information indicating a first contact area that is a contact area between the first underground structure and the second underground structure and calculating a restraining force between the first underground structure and the second underground structure as a first restraining force based on the first contact area information; a second calculation section 112 acquiring second contact area information indicating a second contact area that is a contact area between the second underground structure and the third underground structure and calculating a restraining force between the second underground structure and the third underground structure as a second restraining force based on the second contact area information; and a weak point determining section 113 determining the weak points in the underground area by comparing the first restraining force with the second restraining force.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a weak point determination device, a weak point determination method, and a program.

Background Art

[0002] Conventionally, many of the services of water supply and sewerage, gas, electricity, and communication have been provided through underground pipelines buried underground. The underground pipelines are connected to the walls of manholes (also called inspection chambers) and the walls of spaces corresponding to the underground parts of buildings such as buildings through connection parts. The area where the underground pipelines are connected to the walls is blocked by constructing walls with unreinforced concrete, mortar, bricks, concrete blocks, etc. The underground pipelines and the connected underground structures are each designed separately considering earth pressure, traffic load, ground displacement during an earthquake, etc., and the design method has been established (see, for example, Non-Patent Document 1).

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] During an earthquake, the behavior of the underground pipeline and the wall at the connection part is different. When the relative displacement becomes large, it can no longer absorb the displacement. Therefore, damage such as the underground pipeline protruding or being pulled out and the wall cracking may occur. When the connection part is damaged, groundwater may enter the structure from the cracked or missing part, and at that time, the surrounding sand may also be drawn in. When the sand is drawn in, a cavity is generated in the ground. If the cavity becomes large, it can no longer support the load from the ground surface, which may cause damage such as subsidence or the inclination of surrounding structures. Damage where the underground pipeline protrudes into the manhole during past major earthquakes is also known. Therefore, it is necessary to grasp the load-bearing capacity, etc. of the connection part, and in particular, a technique for easily grasping the connection parts of existing underground structures designed according to old standards, etc. has been demanded. For example, it is conceivable to perform seismic response analysis by three-dimensional finite element analysis in which the connection part of the underground structure and the ground are modeled as solid elements. However, it was not realistic in terms of time and cost to individually model and calculate the connection parts of a large number of underground structures. Thus, a technique for improving the method of identifying the weak parts of the underground structure has been desired.

[0005] In view of such circumstances, an object of the present invention made is to provide a technique for improving the method of identifying the weak parts of the underground structure.

Means for Solving the Problems

[0006] In order to solve the above problems, a weak point determination device according to the present invention is a weak point determination device that determines a weak point in an underground area including a first underground structure, a second underground structure, and a third underground structure, and obtains first contact area information indicating a first contact area that is a contact area between the first underground structure and the second underground structure, and based on the first contact area information, a first calculation unit that calculates a binding force between the first underground structure and the second underground structure as a first binding force, obtains second contact area information indicating a second contact area that is a contact area between the second underground structure and the third underground structure, and based on the second contact area information, a second calculation unit that calculates a binding force between the second underground structure and the third underground structure as a second binding force, and a weak point determination unit that determines a weak point in the underground area by comparing the first binding force and the second binding force.

[0007] Further, a weak point determination method according to the present invention is a method executed by a weak point determination device that determines a weak point in an underground area including a first underground structure, a second underground structure, and a third underground structure, and obtains first contact area information indicating a first contact area that is a contact area between the first underground structure and the second underground structure, and based on the first contact area information, a first calculation step of calculating a binding force between the first underground structure and the second underground structure as a first binding force, obtains second contact area information indicating a second contact area that is a contact area between the second underground structure and the third underground structure, and based on the second contact area information, a second calculation step of calculating a binding force between the second underground structure and the third underground structure as a second binding force, and a weak point determination step of determining a weak point in the underground area by comparing the first binding force and the second binding force.

[0008] Further, a program according to the present invention causes a computer to function as the weak point determination device according to the present invention.

Effect of the Invention

[0009] According to the present invention, it is possible to provide a technique for improving a method for specifying a weak point of an underground structure.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4A

Figure 4B

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10A

Figure 10B

Modes for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present disclosure will be described with appropriate reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals. In the description of the present embodiment, the description of the same or corresponding parts will be omitted or simplified as appropriate. The embodiments described below are examples of the configuration of the present disclosure, and the present invention is not limited to the following embodiments.

[0012] The vulnerability determination device 10 according to this embodiment is a computer such as a server belonging to a cloud computing system or other computing systems.

[0013] <Configuration of Vulnerability Determination Device 10> With reference to FIG. 1, an example of the configuration of the vulnerability determination device 10 according to this embodiment will be described. As shown in FIG. 1, the vulnerability determination device 10 includes a control unit 11, a storage unit 12, a communication unit 13, an input unit 14, and an output unit 15.

[0014] 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 as, for example, a main storage device, an auxiliary storage device, or a cache memory. The storage unit 12 stores any information used for the operation of the vulnerability determination device 10. The storage unit 12 does not necessarily have to be provided inside the vulnerability determination device 10, and may be provided outside the vulnerability determination device 10.

[0015] 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 for the operation of the vulnerability determination device 10 and transmits information obtained by the operation of the vulnerability determination device 10.

[0016] The communication unit 13 enables the vulnerability determination device 10 to transmit and receive information to and from other devices via a network. The network includes the Internet, at least one WAN (Wide Area Network), at least one MAN (Metropolitan Area Network), or a combination thereof. The network may include at least one wireless network, at least one optical network, or a combination thereof. The wireless network is, for example, an ad hoc network, a cellular network, a wireless LAN (Local Area Network), a satellite communication network, or a terrestrial microwave network.

[0017] 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 provided integrally with a display, or a microphone. The input unit 14 receives an operation for inputting information used for the operation of the vulnerability determination device 10. Instead of being provided in the vulnerability determination device 10, the input unit 14 may be connected to the vulnerability determination device 10 as an external input device. As a connection method, for example, any method such as USB (Universal Serial Bus), HDMI (High-Definition Multimedia Interface) (registered trademark), or Bluetooth (registered trademark) can be used.

[0018] 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 may include a device wearable by a user such as a VR goggle. The output unit 15 outputs information obtained by the operation of the weak point determination device 10. Instead of being provided in the weak point determination device 10, the output unit 15 may be connected to the weak point determination device 10 as an external output device. As a connection method, for example, any method such as USB, HDMI (registered trademark), or Bluetooth (registered trademark) can be used.

[0019] The control unit 11 is realized by a control arithmetic circuit (controller). The control arithmetic circuit may be constituted by dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array), may be constituted by a processor, or may be constituted by including both. While controlling each part of the weak point determination device 10, the control unit 11 executes processing related to the operation of the weak point determination device 10. The control unit 11 can transmit and receive information with an external device via the communication unit 13 and the network.

[0020] The control unit 11 includes a first calculation unit 111, a second calculation unit 112, a weak point determination unit 113, and a chart creation unit 114.

[0021] The first calculation unit 111 acquires first contact area information indicating a first contact area which is the contact area between the first underground structure and the second underground structure, and calculates, as a first restraint force, the restraint force between the first underground structure and the second underground structure based on the first contact area information. The first calculation unit 111 acquires information indicating the restraint force per unit area of the first contact area, and multiplies the restraint force per unit area by the first contact area to calculate the first restraint force.

[0022] Each of the first underground structure 51, the second underground structure 52, and the third underground structure 53 has at least a part thereof buried underground. In the present embodiment, the first underground structure 51 is a pipeline, the second underground structure is an opening member for passing the pipeline into the underground space, and the third underground structure 53 is a wall of the underground space. The pipeline is a pipeline into which a communication cable, a power cable, etc. are inserted. Not limited to this, the pipeline may be a water pipe, a gas pipe, etc. The underground space corresponds to a space in the underground part of a building such as a manhole or a building, but is not limited to this, and may be a shelter or the like. The opening member is a member that fills an opening formed in the wall to pass the pipeline through the wall. The opening member is provided on the wall of the manhole and passes the pipeline into the manhole. The opening member fixes the pipeline so that the pipeline can penetrate the wall vertically. The wall is more specifically the side wall of the manhole. Not limited to this, the wall may be the ceiling or floor of the manhole.

[0023] FIG. 2 is a view showing an underground area including a pipeline 51P as the first underground structure 51, an opening member 52S as the second underground structure 52, and a wall 53W as the third underground structure 53. FIG. 2 is a view of the underground area seen from a direction (X-axis direction) perpendicular to the axial direction of the pipeline 51P. As shown in FIG. 2, the pipeline 51P buried in the underground area penetrates the wall 53W through the opening member 52S. FIG. 3 is a view of the configuration of FIG. 2 seen from the axial direction (Y-axis direction) of the pipeline 51P. In FIGS. 2 and 3, a total of four pipelines 51P, two in the Z-axis direction and two in the X-axis direction, are arranged, but the number of pipelines 51P is not limited to this. Also, in FIGS. 2 and 3, the shape of the opening member 52S is a rectangular parallelepiped shape, and the cross-sectional view in the XZ plane is a rectangular shape, but the shape of the opening member 52S is not limited to this, and may be, for example, a cylindrical shape.

[0024] In the present embodiment, the first calculation unit 111 calculates the restraining force B between the opening member 52S and the pipeline 51P as the first restraining force according to the following formula. p In the following formula 1, K p is the restraining force per unit area of the contact area between the opening member 52S and the pipeline 51P, as also shown in FIG. 2. A prepresents the first contact area, which is the contact area between the opening member 52S and the pipeline 51P. N pH represents the number of pipelines 51P arranged in the horizontal direction, that is, arranged in the XY plane of FIG. 2 or FIG. 3. N pV represents the number of pipelines 51P arranged in the vertical direction, that is, arranged in the YZ plane of FIG. 2 or FIG. 3. D p represents the outer diameter of the pipeline 51P. L m is the depth dimension of the opening member 52S along the axial direction of the pipeline 51P, and is also shown in FIG. 2.

[0025] B p =K p ·A p =K p ·N pH ·N pV ·π·D p ·L m (Equation 1)

[0026] The arrangement of the pipelines 51P passing through the opening member 52S is not limited to the rectangular arrangement as shown in FIG. 3. For example, it may be an arrangement that is not rectangular as shown in FIG. 4A or a circular arrangement as shown in FIG. 4B. In this case, for the arrangement of the pipelines 51P shown in FIGS. 4A and 4B, the restraint force B pH and N pV can be calculated by using the number of pipelines 51P obtained by any method instead. In the right side of the above Equation 1, the number of pipelines 51P passing through the opening member 52S is calculated by multiplying N p and N pH and N pV , but it is not limited to this. The number of pipelines 51P may be calculated by any formula. The number of pipelines 51P may be obtained by referring to and reading the database stored in advance in the storage unit 12 or an external device. The database can include information indicating the number of pipelines passed through by the opening member 52S as the specification of the opening member 52S.

[0027] The first calculation unit 111 is the first contact area A pThe first calculation unit 111 can acquire the first contact area information indicating the binding force K per unit area of ​​the contact area between the opening member 52S and the pipe 51P by referring to a database stored in advance in the storage unit 12 or an external device and reading it out. The database may be created at the time of the burying work or inspection of the pipe 51P. p Any method may be used to acquire the information, and for example, the first calculation unit 111 can acquire the information by referring to and reading out a database that is a database that accumulates values ​​obtained by Experiment 1 described below and is stored in advance in the storage unit 12 or an external device.

[0028] The first calculation unit 111 calculates the first contact area A shown in the middle side of the above formula 1. p If it is not possible to obtain the above, the calculation shown on the right side of the above formula 1 may be performed.

[0029] The first calculation unit 111 calculates the other values ​​in the above formula 1, that is, the number N of the pipes 51P arranged in the horizontal direction. pH and the number N of pipes 51P arranged vertically pV and the outer diameter D of the pipe 51P p and the depth dimension L of the opening member 52S along the axial direction of the pipe 51P. m The information indicating the first contact area A may be obtained by any method. For example, p Similarly, the information can be acquired by referring to and reading out a database stored in advance in the storage unit 12 or an external device.

[0030] Restraint force K per unit area of ​​contact area between opening material 52S and pipe 51P p may be a value obtained by an experiment. In this embodiment, the restraining force refers to the force that any one of the first underground structure, the second underground structure, the third underground structure, and the ground restrains the movement of the other one of the first underground structure, the second underground structure, the third underground structure, or the ground when an earthquake occurs. In the following, this experiment will be described as Experiment 1.

[0031] <Experiment 1> With reference to FIG. 5, the restraint force K per unit area of the contact area between the opening member 52S and the pipeline 51P p An example of Experiment 1 for calculating this will be described. In FIG. 5, the pipeline 51T is a partial pipeline as an experimental specimen having the same material, diameter, and thickness as the pipeline 51P. The opening member 52T is a member as an experimental specimen made of the same material as the opening member 52S. The pipeline 51T is sandwiched between the opening members 52T, and a restraint force is applied. In the experiment, a load indicated by a white arrow is applied to the pipeline 51T. Since the details of the experiment are described in, for example, Document 2 below, a detailed description will be omitted. Document 2: Toshiyuki Fukumoto, et al., "Friction and Adhesion Characteristics of Steel-Concrete Contact Surfaces under Restraint Stress", Transactions of the Architectural Institute of Japan, Structural Series, Vol. 82, No. 736, pp. 940-948, 2017

[0032] The restraint force K per unit area p is obtained by dividing the maximum load at the time when displacement occurs in the pipeline 51T, measured by the experiment, by the contact area between the pipeline 51T and the opening member 52T. FIG. 6 is a graph showing an example of the relationship between the displacement and the load measured by the experiment. The arrow indicates the maximum load. Also, according to Document 2 above, the adhesion force between concrete and steel is proportional to the lateral pressure. Therefore, in the experiment, the adhesion force may be corrected by the ratio between the pressure actually received by the pipeline 51P from the opening member 52S and the pressure received by the pipeline 51T shown in FIG. 5 from the opening member 52T, based on the dimensions of the opening member 52S and the pipeline 51P, the overburden, etc.

[0033] The restraint force K per unit area thus obtained p is stored in the database for each combination of elements such as the material, diameter, and thickness of the pipeline 51T and elements such as the material of the opening member 52T. The first calculation unit 111 can acquire information indicating the restraint force K per unit area of the first contact area by referring to and reading out the database. p

[0034] The first calculation unit 111 may calculate the first restraint force by the following formula 2. Formula 2 is not included in formula 1, K gp , A​gp and L gp including K gp K represents the restraint force per unit area of the contact area between the pipeline 51P and the ground, and A gp A represents the contact area between the peripheral surface of the pipeline 51P and the ground, and L gp L is the predetermined axial length of the portion where the pipeline 51P extending from the opening member 52S into the ground directly contacts the ground, as also shown in FIG. 2. This length may be freely set.

[0035] B p =K p ·A p +K gp ·A gp =K p ·N pH ·N pV ·π·D p ·L m +K gp ·N pH ·N pV ·π·D p ·L gp (Equation 2)

[0036] The first calculation unit 111 can obtain information indicating the contact area A between the peripheral surface of the pipeline 51P and the ground gp and the axial length L of the portion where the pipeline 51P extending from the opening member 52S into the ground directly contacts the ground gp by any method. For example, similar to the above-described first contact area A p it can be obtained by referring to a database pre-stored in the storage unit 12 or an external device.

[0037] The restraint force K per unit area between the pipeline 51P and the ground gp may be a value obtained through experiments. For example, the first calculation unit 111 can refer to and read from a database registering the results of conducting an experiment similar to Experiment 3 described below on the pipeline 51T to obtain information indicating the restraint force K gp per unit area between the pipeline 51P and the ground.

[0038] The first calculation unit 111 can obtain, as ground restraint force information, the result of multiplying the surface area of the pipeline 51P in contact with the ground by the restraint force K per unit area between the pipeline 51P and the ground, as shown in Equation 2 above. In this way, the first calculation unit 111 can further obtain ground restraint force information indicating the restraint force from the ground in the underground region, and calculate the first restraint force based on the ground restraint force information. gp The second calculation unit 112 obtains second contact area information indicating the second contact area, which is the contact area between the second underground structure and the third underground structure, and calculates, based on the second contact area information, the restraint force between the second underground structure and the third underground structure as the second restraint force. The second calculation unit 112 obtains information indicating the restraint force per unit area of the second contact area, and multiplies the restraint force per unit area by the second contact area to calculate the second restraint force.

[0039] In the present embodiment, the second calculation unit 112 calculates, by the following Equation 3, the restraint force B between the opening member 52S and the wall 53W as the second restraint force.

[0040] In the following Equation 3, K w is the restraint force per unit area of the contact area between the opening member 52S and the wall 53W, and is also shown in FIG. 2. A w is the second contact area indicating the contact area between the opening member 52S and the wall 53W. K w is the restraint force per unit area of the contact area between the opening member 52S and the ground, and is also shown in FIG. 2. A g is the contact area between the peripheral surface of the opening member 52S and the ground. L g is the thickness of the wall 53W, and is also shown in FIG. 2. L w is the dimension of the depth of the opening member 52S along the axial direction of the pipeline 51P, similar to Equation 1 above, and is also shown in FIG. 2. W m is the dimension of the width of the opening member 52S in the horizontal direction, that is, in the XY plane of FIG. 2 or FIG. 3, and is also shown in FIG. 3. h o is the dimension of the height of the opening member 52S in the vertical direction, that is, in the ZY plane of FIG. 2 or FIG. 3, and is also shown in FIG. 3. o The first calculation unit 111 can obtain, as ground restraint force information, the result of multiplying the surface area of the pipeline 51P in contact with the ground by the restraint force K per unit area between the pipeline 51P and the ground, as shown in Equation 2 above. In this way, the first calculation unit 111 can further obtain ground restraint force information indicating the restraint force from the ground in the underground region, and calculate the first restraint force based on the ground restraint force information.

[0041] B w =Kw ·A w +K g ·A g ={K w ·L w +K g (L m -L W )}·2(W o +h o ) (Equation 3)

[0042] The second calculation unit 112 can obtain the second contact area information indicating the second contact area A w by referring to and reading from a database pre-stored in the storage unit 12 or an external device. The database may be created during the embedding work or inspection of the opening member 52S. The second calculation unit 112 also obtains information indicating the restraint force K w per unit area of the contact area between the opening member 52S and the wall 53W and the restraint force K g per unit area of the contact area between the opening member 52S and the ground. Any method may be adopted for obtaining the information. For example, it may be a database that accumulates values obtained by Experiments 2 and 3 described below, and can be obtained by referring to and reading from a database pre-stored in the storage unit 12 or an external device.

[0043] When the second calculation unit 112 cannot obtain the second contact area A w shown on the middle side of the above Equation 1 and the contact area A g between the peripheral surface of the opening member 52S and the ground, it may perform calculations as shown on the right side of the above Equation 3.

[0044] The second calculation unit 112 calculates other values in the above Equation 3, that is, the contact area A g between the peripheral surface of the opening member 52S and the ground, the thickness L w of the wall 53W, the depth dimension L m of the opening member 52S along the axial direction of the pipeline 51P, the horizontal width dimension W o of the opening member 52S, and the vertical height dimension h oInformation indicating [the above] may be obtained by any method. For example, it can be obtained by referring to and reading a database stored in advance in the storage unit 12 or an external device.

[0045] The restraint force K per unit area of the contact area between the opening member 52S and the wall 53W w may be a value obtained by Experiment 2 described below. For example, the second calculation unit 112 can obtain information indicating the restraint force K per unit area of the contact area between the opening member 52S and the wall 53W by referring to and reading a database that stores the results of Experiment 2 described below. w

[0046] <Experiment 2> Referring to FIG. 7, an example of Experiment 2 for obtaining the restraint force K per unit area of the contact area between the opening member 52S and the wall 53W w will be described. The opening member 52T in FIG. 7 is a member as an experimental specimen made of the same material as the opening member 52S. The wall 53T is a partial wall as an experimental specimen made of the same material as the wall 53W. The opening member 52T is sandwiched between the walls 53T, and a restraint force is applied. In the experiment, a load indicated by a white arrow is applied to the opening member 52T.

[0047] The restraint force K per unit area w is obtained by dividing the maximum load at the time when displacement occurs in the opening member 52T, which is measured by the experiment, by the contact area between the wall 53T and the opening member 52T. Also, similar to the above Experiment 1, the adhesive force may be corrected by the ratio between the pressure actually received by the opening member 52S from the wall 53W and the pressure received by the opening member 52T shown in FIG. 7 from the wall 53T, based on the dimensions of the opening member 52S and the wall 53W, the overburden, etc.

[0048] The restraint force K per unit area obtained in this way w is stored in a database for each combination of elements such as the material of the opening member 52T and elements such as the material of the wall 53T. The second calculation unit 112 can obtain information indicating the restraint force K per unit area of the second contact area by referring to and reading the database. w ​​

[0049] The restraint force K per unit area of the contact area between the opening member 52S and the ground g may be a value obtained by Experiment 3 described below. For example, the second calculation unit 112 reads by referring to a database that stores the results of Experiment 3 described below, and thereby obtains information indicating the restraint force K per unit area of the contact area between the opening member 52S and the ground g may be acquired.

[0050] <Experiment 3> Referring to FIG. 8, an example of Experiment 3 for obtaining the restraint force K per unit area of the contact area between the opening member 52S and the ground g will be described. In FIG. 8, the opening member 52T is a member as an experimental specimen made of the same material as the opening member 52S. Referring to FIG. 8, the ground similar to the ground around the opening member 52S is embedded in the soil tank, the opening member 52T is inserted from the side surface of the soil tank, and the restraint force from the ground is applied. In the experiment, a load indicated by a white arrow is applied to the opening member 52T.

[0051] The restraint force K per unit area g is obtained by dividing the maximum load at the time when displacement occurs in the opening member 52T, which is measured by the experiment, by the contact area between the ground and the opening member 52T.

[0052] The restraint force K per unit area of the contact area between the opening member 52S and the ground obtained in this way g is stored in the database for each combination of elements such as the material of the opening member 52T and elements such as the type of the ground. The second calculation unit 112 can acquire information indicating the restraint force K per unit area by referring to and reading from the database. g can be acquired.

[0053] The second calculation unit 112 can acquire, as ground restraint force information, the result of multiplying the surface area of the opening member 52S in contact with the ground by the restraint force per unit area between the opening member 52S and the ground in contact therewith, as shown in Equation 3 above. In this way, the second calculation unit 112 can further acquire ground restraint force information indicating the restraint force from the ground in the underground region, and can calculate the second restraint force based on the ground restraint force information.

[0054] The first calculation unit 111 and the second calculation unit 112 may acquire material information indicating information on the material for each of the first underground structure, the second underground structure, and the third underground structure, and use the material information in the calculation of the first restraint force or the second restraint force. The first calculation unit 111 and the second calculation unit 112 can calculate the first restraint force or the second restraint force by using an arbitrary coefficient preset for each material indicated by the material information in Equation 1, Equation 2, or Equation 3 above. The coefficient may be determined in advance according to the combination of the material of the first underground structure and the material of the second underground structure, or the combination of the material of the second underground structure and the material of the third underground structure.

[0055] For example, for the pipeline 51P, the material information may include the type of pipeline such as a steel pipe or a vinyl pipe. For the opening member 52S or the wall 53W, the material information may include types such as unreinforced concrete, mortar, brick, and concrete block. Thereby, the restraint force can be calculated with higher accuracy according to the material of the underground structure.

[0056] The first calculation unit 111 and the second calculation unit 112 may acquire ground information regarding the characteristics of the ground around the first underground structure, the second underground structure, and the third underground structure, and use the ground information in the calculation of the first restraint force or the second restraint force. The first calculation unit 111 and the second calculation unit 112 can calculate the first restraint force or the second restraint force by using an arbitrary coefficient preset for each characteristic of the ground indicated by the ground information in Equation 1, Equation 2, or Equation 3 above. The characteristics of the ground include, for example, the type of ground such as a rock layer, a sand layer, a clay layer, and the moisture content. Thereby, the restraint force can be calculated with higher accuracy according to the characteristics of the ground.

[0057] Each of the first calculation unit 111 and the second calculation unit 112 outputs the calculated first restraint force and second restraint force to the weak point determination unit 113.

[0058] The weak point determination unit 113 determines the weak point in the underground area by comparing the first restraint force and the second restraint force. Specifically, the weak point determination unit 113 determines that when the first restraint force B p is greater than the second restraint force B w , the weak point is determined to be the boundary between the opening member 52S and the wall 53W. The weak point determination unit 113 determines that when the second restraint force B w is greater than the first restraint force B p , the weak point is determined to be the boundary between the opening member 52S and the pipeline 51P. In this way, the weak point determination unit 113 determines that the boundary part with the weaker restraint force against the second underground structure among the first underground structure and the third underground structure is the weak point. The weak point determination unit 113 outputs the determined weak point to the chart creation unit 114.

[0059] The chart creation unit 114 creates a chart that associates the dimensions of the first underground structure and the second underground structure acquired by the first calculation unit 111 and the second calculation unit 112 with the weak point determined by the weak point determination unit 113. FIG. 9 shows an example of the chart created by the chart creation unit 114. In the chart of FIG. 9, the opening member dimensions include dimensions such as the width, height of the opening member 52S, or the number of openings for inserting the pipeline 51P, and the diameter of the opening. It is not limited to this, and the opening member dimensions may be the total value obtained by combining two or more of these dimensions. The number of pipelines is the number of pipelines 51P passing through the opening member 52S, which is 4 in the example of FIG. 3. The opening member dimensions and the number of pipelines may include the values used in equations 1 to 3 used by the first calculation unit 111 and the second calculation unit 112 described above.

[0060] Generally, the larger the value of the opening member dimensions, the larger the first contact area between the opening member 52S and the wall 53W, and at the same time, the number of pipelines that can pass through the opening member 52S increases. The larger the value of the number of pipelines, the larger the second contact area between the opening member 52S and the pipeline 51P passing through the opening member 52S.

[0061] In the F region of the chart in FIG. 9, the value of the opening member dimension ranges from a value near the median value to the maximum value, and the number of pipes 51P ranges from a value close to the median value to a value close to the maximum number. The weak point determined by the weak point determination unit 113 is shown. In the G region, the value of the opening member dimension ranges from the minimum value to the maximum value, and the number of pipes 51P ranges from the minimum number to a value close to the maximum number. The weak point determined by the weak point determination unit 113 is shown. In the E region of FIG. 9, the value of the opening member dimension is smaller than the median value, and the number of pipes 51P ranges from a value close to the minimum number to the maximum number. However, in this case, the pipe 51P does not match the dimension of the opening member 52S, and the pipe 51P does not fit into the opening member 52S. Therefore, it is a region where the result of the determination by the weak point determination unit 113 is not considered. In this way, the chart creation unit 114 can create a chart according to the normalized dimensions of the pipe 51P and the opening member 52S.

[0062] In the present embodiment, in region F, the second restraint force B between the opening member 52S and the wall 53W is determined by the weak point determination unit 113 w is smaller than the first restraint force B between the opening member 52S and the pipe 51P p and it is determined that the boundary between the opening member 52S and the wall 53W is the weak point. In region G, the first restraint force B between the opening member 52S and the pipe 51P is determined by the weak point determination unit 113 p is smaller than the second restraint force B between the opening member 52S and the wall 53W w and it is determined that the boundary between the opening member 52S and the pipe 51P is the weak point.

[0063] The chart creation unit 114 can display the chart to the user via the output unit 25. If the user knows the dimensions of the opening member 52S and the number of pipelines 51P, the user can immediately determine the weak point by looking at the chart. For example, when the point corresponding to the number of pipelines 51P and the dimensions of the opening member 52S enters the area F in the chart of FIG. 9, the user can immediately know that the weak point is the boundary between the opening member 52S and the wall 53W. In this case, the user can consider measures such as increasing the thickness of the wall 53W for reinforcement from the inside of the structure having the wall 53W, adding a member that suppresses the displacement of the opening member 52S during an earthquake to the opening member 52S, or taking both measures. On the other hand, when the point corresponding to the number of pipelines 51P and the dimensions of the opening member 52S enters the area G, the user can immediately know that the weak point is the boundary between the opening member 52S and the pipeline 51P. Therefore, the user can consider measures such as installing a joint having a telescopic function that absorbs displacement in the pipe axis direction in the pipeline 51P near the wall 53W to reduce the external force.

[0064] The chart is not limited to the form as shown in FIG. 9, and may be information in a form that fixes one dimension of the first underground structure or the second underground structure and lists the dimensions of the other underground structure and the weak points.

[0065] <Program> In order to function as the above-described weak point determination device 10, it is also possible to use a computer capable of executing program instructions. Here, the computer may be a general-purpose computer, a dedicated computer, a workstation, a PC (Personal Computer), an electronic notebook pad, or the like. The program instructions may be program codes, code segments, etc. for executing necessary tasks.

[0066] A computer includes a processor, a memory unit, an input unit, an output unit, and a communication interface. The processor can be 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 a plurality of processors of the same or different types. The processor reads a program from the memory unit and executes it to control each of the above components and perform various arithmetic processes. Note that at least a part of these processing contents 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, a keyboard, a mouse, etc. The output unit is an output interface that outputs information, such as a display, a speaker, etc. The communication interface is an interface for communicating with an external device.

[0067] The program may be recorded on a computer-readable recording medium. By using such a recording medium, it is possible to install the program 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, a USB memory, etc. Also, this program may be in a form downloaded from an external device via a network.

[0068] <Operation of the Weak Point Determination Device 10> Next, with reference to FIGS. 10A and 10B, the operation of the weak point determination device 10 according to this embodiment will be described. The operation of the weak point determination device 10 corresponds to the weak point determination method according to this embodiment.

[0069] In step S1 of FIG. 10A, the first calculation unit 111 of the weak point determination device 10 acquires first contact area information indicating a first contact area that is the contact area between the first underground structure and the second underground structure. Any method may be adopted for acquiring the first contact area information. The first calculation unit 111 may acquire, as the first contact area information, a value calculated by calculating the contact area between the pipeline 51P and the opening member 52S as shown on the right side of Equation 1 or Equation 2.

[0070] In step S2, the first calculation unit 111 acquires information indicating the restraint force K per unit area of the first contact area. p Any method may be adopted for acquiring the information. For example, the first calculation unit 111 can acquire the information by referring to and reading out a database storing the results of Experiment 1 above.

[0071] In step S3, the first calculation unit 111 acquires ground restraint force information indicating the restraint force from the ground in the underground area. In the present embodiment, as shown in Equation 2, the first calculation unit 111 acquires, as the ground restraint force information, the result of multiplying the surface area of the pipeline 51P in contact with the ground by the restraint force per unit area between the pipeline 51P and the ground.

[0072] In step S4, the second calculation unit 112 acquires second contact area information indicating a second contact area that is the contact area between the second underground structure and the third underground structure. Any method may be adopted for acquiring the second contact area information. The second calculation unit 112 may acquire, as the second contact area information, a value calculated by calculating the contact area between the opening member 52S and the wall 53W as shown on the right side of Equation 3.

[0073] In step S5, the second calculation unit 112 acquires information indicating the restraint force per unit area of the second contact area. Any method may be adopted for acquiring the information. For example, the second calculation unit 112 can acquire the information by referring to and reading out a database storing the results of Experiment 2 above.

[0074] In step S6, the first calculation unit 111 acquires ground restraint force information indicating the restraint force from the ground in the underground area. In the present embodiment, as shown in Equation 3, the second calculation unit 112 acquires, as the ground restraint force information, the result of multiplying the surface area of the opening member 52S in contact with the ground by the restraint force per unit area between the opening member 52S and the ground. For example, the second calculation unit 112 can acquire the ground restraint force information by referring to and reading out a database storing the results of the above Experiment 3.

[0075] In step S7, the first calculation unit 111 and the second calculation unit 112 acquire material information indicating information on the material for each of the first underground structure, the second underground structure, and the third underground structure.

[0076] In step S8, the first calculation unit 111 and the second calculation unit 112 acquire ground information regarding the characteristics of the ground around the first underground structure, the second underground structure, and the third underground structure.

[0077] In step S9, the first calculation unit 111 calculates the first restraint force according to the above Equation 1 or 2 based on the various types of information acquired in steps S1 to 3, step S7, and step S8. The first calculation unit 111 can use an arbitrary coefficient in the above Equation 1 or 2 according to the materials of the first underground structure and the second underground structure indicated by the material information acquired in step S7 and the characteristics of the ground indicated by the ground information acquired in step S8 to calculate the first restraint force. The first calculation unit 111 outputs the calculated first restraint force to the weakness determination unit 113.

[0078] In step S10, the second calculation unit 112 calculates the second restraint force according to the above Equation 3 based on the various types of information acquired in steps S4 to 8. The second calculation unit 112 can use an arbitrary coefficient in the above Equation 3 according to the materials of the second underground structure and the third underground structure indicated by the material information acquired in step S7 and the characteristics of the ground indicated by the ground information acquired in step S8 to calculate the second restraint force. The second calculation unit 112 outputs the calculated second restraint force to the weakness determination unit 113.

[0079] In step S11, the weakness determination unit 113 determines a weak point in the underground area by comparing the first binding force and the second binding force. The weakness determination unit 113 outputs the determined weak point to the chart creation unit 114.

[0080] In step S12, the chart creation unit 114 creates a chart that associates the dimensions of the first underground structure and the second underground structure acquired by the first calculation unit 111 and the second calculation unit 112 with the weak point determined by the weakness determination unit 113. The chart creation unit 114 can display the chart created according to the user's request via the output unit 25. Then, the operation of the weak point determination device 10 ends.

[0081] As described above, the weak point determination device 10 of the present embodiment is a device that determines a weak point in an underground area including a first underground structure, a second underground structure, and a third underground structure. The weak point determination device 10 acquires first contact area information indicating a first contact area that is a contact area between the first underground structure and the second underground structure, and based on the first contact area information, calculates the binding force between the first underground structure and the second underground structure as the first binding force. A first calculation unit 111, second contact area information indicating a second contact area that is a contact area between the second underground structure and the third underground structure is acquired, and based on the second contact area information, the binding force between the second underground structure and the third underground structure is calculated as the second binding force. A second calculation unit 112, and a weakness determination unit 113 that determines a weak point in the underground area by comparing the first binding force and the second binding force.

[0082] According to the present embodiment, by comparing the binding force between the first underground structure and the second underground structure that are in contact with each other and the binding force between the second underground structure and the third underground structure, a location where damage is assumed to occur during an earthquake can be determined as a weak point. It is possible to identify locations that require earthquake countermeasures without actually having a person enter the underground space for inspection, leading to cost reduction. Therefore, a technique for improving the method of identifying weak points in underground structures can be provided.

[0083] As described above, in the weak point determination device 10 of the present embodiment, the first calculation unit 111 acquires information indicating the restraint force per unit area of the first contact area, multiplies the restraint force per unit area by the first contact area to calculate the first restraint force, the second calculation unit 112 acquires information indicating the restraint force per unit area of the second contact area, and multiplies the restraint force per unit area by the second contact area to calculate the second restraint force.

[0084] According to the present embodiment, by calculating the restraint force using the value of the restraint force per unit area and comparing the calculated values, it is possible to accurately determine which of the first underground structure or the third underground structure with which the second underground structure comes into contact has a weaker restraint force. Therefore, it is possible to provide a technique for improving the method of identifying the weak point of the underground structure.

[0085] As described above, in the weak point determination device 10 of the present embodiment, the first calculation unit 111 or the second calculation unit 112 further acquires ground restraint force information indicating the restraint force from the ground in the underground area, and calculates the first restraint force or the second restraint force based on the ground restraint force information.

[0086] According to the present embodiment, by further considering the restraint force from the ground around the underground structure, it is possible to accurately determine which of the first underground structure or the third underground structure with which the second underground structure comes into contact has a weaker restraint force. Therefore, it is possible to provide a technique for improving the method of identifying the weak point of the underground structure.

[0087] As described above, the weak point determination device 10 of the present embodiment further includes a chart creation unit 114 that creates a chart associating the dimensions of the first underground structure and the second underground structure acquired by the first calculation unit 111 and the second calculation unit 112 with the weak points determined by the weak point determination unit 113.

[0088] According to the present embodiment, a chart that allows the weak points to be listed and confirmed from the dimensions of the first underground structure and the second underground structure can be created. For standardized underground structures whose dimensions are known in advance, it becomes easier for the user to grasp the weak points. Therefore, it is possible to provide a technique for improving the method of identifying the weak point of the underground structure.

[0089] As described above, in the weak point determination device 10 of the present embodiment, the first underground structure is the pipeline 51P, the third underground structure is the wall 53W, and the second underground structure is a member that fills an opening formed in the wall 53W to pass the pipeline 51P through the wall 53W.

[0090] According to the present embodiment, by obtaining and comparing the restraint forces for the pipeline 51P connected to the manhole, the opening member 52S, and the wall 53W and the opening member 52S respectively, it is possible to identify on which side of the pipeline 51P side and the wall 53W side of the opening member 52S the weak point is during an earthquake. It is easy to identify the weak points for these multiple sites underground, making it easier to plan maintenance. Therefore, a technique for improving the method of identifying the weak points of the underground structure can be provided.

[0091] Although the present invention has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present invention. Therefore, it should be noted that these modifications and corrections are included in the scope of the present invention.

Explanation of Reference Numerals

[0092] 10 Weak point determination device 11 Control unit 12 Storage unit 13 Communication unit 14 Input unit 15 Output unit 51P Pipeline 52S Opening member 53W Wall 111 First calculation unit 112 Second calculation unit 113 Weak point determination unit 114 Chart creation unit

Claims

Claim 1 A weak point determination device that includes a first underground structure, a second underground structure, and a third underground structure, wherein the first underground structure and the second underground structure are in contact with each other, the second underground structure and the third underground structure are in contact with each other, and the boundary between the first underground structure and the second underground structure or the boundary between the second underground structure and the third underground structure is weaker than the strength of each of the first underground structure, the second underground structure, and the third underground structure, and determines a weak point in the underground area that becomes a weak point area, a first calculation unit that acquires first contact area information indicating a first contact area that is the contact area between the first underground structure and the second underground structure, and calculates a constraint force between the first underground structure and the second underground structure as a first constraint force based on the first contact area information; a second calculation unit that acquires second contact area information indicating a second contact area that is the contact area between the second underground structure and the third underground structure, and calculates a constraint force between the second underground structure and the third underground structure as a second constraint force based on the second contact area information; a weak point determination unit that determines the weak point in the underground area by comparing the first constraint force and the second constraint force, and determining that the weak point is the boundary between the second underground structure and the third underground structure when the first constraint force is greater than the second constraint force, and determining that the weak point is the boundary between the first underground structure and the second underground structure when the second constraint force is greater than the first constraint force A weak point determination device comprising the above. Claim 2 The first calculation unit acquires information indicating a constraint force per unit area of the first contact area, and multiplies the constraint force per unit area by the first contact area to calculate the first constraint force. The second calculation unit acquires information indicating a constraint force per unit area of the second contact area, and multiplies the constraint force per unit area by the second contact area to calculate the second constraint force. The weak point determination device according to claim 1. Claim 3 The first calculation unit or the second calculation unit further acquires ground constraint force information indicating a ground constraint force from the ground in the underground area, and calculates the first constraint force or the second constraint force based on the ground constraint force information. The weak point determination device according to claim 1. Claim 4 The weakness determination device according to claim 3, further comprising a chart creation unit that creates a chart associating the dimensions of the first underground structure and the second underground structure acquired by the first calculation unit and the second calculation unit with the weakness part determined by the weakness determination unit.

5. The first underground structure is a pipeline, The third underground structure is a wall, The weakness determination device according to any one of claims 1 to 4, wherein the second underground structure is a member that fills an opening formed in the wall to pass the pipeline through the wall.

6. A method executed by a weakness determination device that includes a first underground structure, a second underground structure, and a third underground structure, wherein the first underground structure and the second underground structure are in contact with each other, the second underground structure and the third underground structure are in contact with each other, and the boundary between the first underground structure and the second underground structure or the boundary between the second underground structure and the third underground structure is weaker than the strength of each of the first underground structure, the second underground structure, and the third underground structure and becomes a weakness part in an underground area where a weakness part is determined, comprising: a first calculation step of obtaining first contact area information indicating a first contact area that is a contact area between the first underground structure and the second underground structure, and calculating a constraint force between the first underground structure and the second underground structure as a first constraint force based on the first contact area information; a second calculation step of obtaining second contact area information indicating a second contact area that is a contact area between the second underground structure and the third underground structure, and calculating a constraint force between the second underground structure and the third underground structure as a second constraint force based on the second contact area information; a weakness determination step of determining the weakness part by comparing the first constraint force and the second constraint force, and determining that the weakness part is the boundary between the second underground structure and the third underground structure when the first constraint force is greater than the second constraint force, and determining that the weakness part is the boundary between the first underground structure and the second underground structure when the second constraint force is greater than the first constraint force, thereby determining the weakness part in the underground area A weakness determination method including.

7. The first calculation step includes obtaining information indicating a constraint force per unit area of the first contact area, and calculating the first constraint force by multiplying the constraint force per unit area by the first contact area. The second calculation step includes obtaining information indicating the restraint force per unit area of the second contact area, and multiplying the restraint force per unit area by the second contact area to calculate the second restraint force. The method for determining a weak point portion according to claim 6.

8. A program for causing a computer to function as the weak point portion determination device according to any one of claims 1 to 4.

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