Ground survey location tampering prevention system

Abstract

To provide a suppression system allowing potential risk that ground exploration with a ground exploration machine is intentionally performed at a position different from a planned exploration position to be reduced.SOLUTION: A suppression system 1 of a ground exploration position falsification is provided with: a first GPS antenna 62 detachably formed on a rod of an exploration body 3 of a ground exploration machine 2; a first position calculation unit 67 for calculating a position of a first GPS based on a GPS signal received through the first GPS antenna; a second GPS antenna 52 provided in a housing of a controller 4 of the ground exploration machine 2; and a second position calculation unit 57 for calculating a position of a second GPS based on a GPS signal received through the second GPS antenna.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION An embodiment of the present invention relates to a geotechnical survey position tamper deterrent system. [Background technology]

[0002] Ground investigations involve measuring the penetration resistance of the ground in situ using soil surveying equipment such as a Swedish sounding tester, measuring its hardness or compaction, and measuring the composition of the soil layers to estimate the bearing capacity. The foundation of a building is selected based on the results of this soil investigation. For example, if the ground is determined to be weak, ground improvement work is carried out, in which a cement-based solidifying agent is turned into a slurry and injected into the target ground while mechanically mixing and stirring, solidifying the soil into columns and strengthening the ground. To ensure safe and secure building construction in the future, the reliability of soil investigation results is of utmost importance, and falsification of soil investigation data should naturally be avoided.

[0003] There are various types of falsification of soil survey data. Convenient manipulation of soil survey data generated by soil survey equipment is a typical example of falsification of soil survey data. However, there are also cases where the survey is not conducted at the planned location in the first place. This can occur when heavy objects such as lumber or scaffolding are present at or near the planned measurement location and cannot be easily removed, or when the soil survey needs to be completed quickly. In particular, if the results of a soil survey conducted far away from the planned measurement location are used as the soil survey results, even if ground improvement work is carried out based on the results of that survey, the soil improvement may be insufficient, and the safety of the building may not be guaranteed. Summary of the Invention [Problem to be solved by the invention]

[0004] The purpose is to prevent tampering with ground survey locations. [Means for solving the problem]

[0005] The ground investigation position tampering prevention system of this embodiment is applied to a ground investigation machine consisting of an investigation machine main body that investigates the ground by penetrating a rod into the ground and a control device that controls the investigation machine main body, and in order to prevent tampering of the ground investigation position, the system includes a first GPS antenna that is detachably configured on the rod, a first position calculation unit that calculates the first GPS position based on the GPS signal received by the first GPS antenna, a second GPS antenna that is equipped on the control box of the ground investigation machine, and a second position calculation unit that calculates the second GPS position based on the GPS signal received by the second GPS antenna; a positional deviation amount calculation unit that calculates a positional deviation amount of the first GPS position relative to a planned position of the ground survey; and an inter-device distance calculation unit that calculates an inter-device distance between the first GPS position and the second GPS position. It is equipped with: [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a diagram showing the configuration of a ground investigation position tampering prevention system according to this embodiment. [Figure 2] FIG. 2 is a functional configuration diagram of the control device and the relay device of FIG. [Figure 3] FIG. 3 is a functional configuration diagram of the location information acquisition device of FIG. [Figure 4] FIG. 4 is a functional configuration diagram of the information processing terminal of FIG. [Figure 5] FIG. 5 is a flowchart showing a process of determining the conditions for starting a ground investigation by the information processing terminal of FIG. [Figure 6] FIG. 6 is a flowchart showing the flag update process performed by the relay device of FIG. [Figure 7] FIG. 7 is a flowchart showing the procedure for starting control of the surveying device main body by the control device of FIG. [Figure 8] FIG. 8 is a diagram showing the positional relationship of each device when a ground investigation is carried out at a planned measurement position using the ground investigation position tampering prevention system according to this embodiment. [Figure 9] FIG. 9 is a diagram showing the positional relationship of each device when a ground investigation is carried out within an allowable range from the planned measurement position using the ground investigation position tampering prevention system according to this embodiment. [Figure 10] FIG. 10 is a diagram showing the positional relationship of each device when an attempt is made to falsify a ground investigation position using the ground investigation position falsification prevention system according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] A ground investigation position tampering prevention system according to this embodiment will be described below with reference to the drawings. One feature of this embodiment is that it acquires the GPS position (first GPS position) of the investigation machine body of a ground investigation machine and the GPS position (second GPS position) of the control device of the ground investigation machine. Since the GPS position of the investigation machine body and the GPS position of the control device are recorded when a ground investigation is performed by the investigation machine body, tampering of the ground investigation position by an investigator can be prevented. Furthermore, based on the GPS position of the investigation machine body and the GPS position of the control device, it is possible to determine whether the investigation machine body is installed at the planned location for the ground investigation. This prevents an investigator from installing the investigation machine body in an incorrect location, thereby preventing unintentional tampering of the ground investigation position. Furthermore, based on the determination result, it is possible to control whether or not to start a ground investigation by the investigation machine body. If the investigation machine body is not installed at the planned location for the ground investigation or a location nearby, it is not possible to start a ground investigation by the investigation machine body, thereby preventing tampering of the ground investigation position.

[0008] The ground survey position tampering prevention system according to this embodiment is configured as follows. As shown in FIG. 1, the ground investigation position tampering prevention system 1 includes a ground investigation machine 2, an information processing terminal 7, and a relay device 5 that relays between the ground investigation machine 2 and the information processing terminal 7. The ground investigation machine 2 comprises a ground investigation machine main body 3 and a control device 4, which are directly connected by a cable. The relay device 5 is housed inside the housing of the control device 4. The relay device 5 is directly connected to the serial port of the control device 4 by a cable and can be connected to the information processing terminal 7 under a short-range wireless communication standard such as Bluetooth (registered trademark). The information processing terminal 7 can be connected to a server device 8 via the Internet 10. Ground investigation data generated by the ground investigation machine 2 is transmitted to the information processing terminal 7 via the relay device 5, where a ground investigation ID is assigned and transmitted to the server device 8. The server device 8 centrally manages the ground investigation data based on the ground investigation ID. In response to a request from a client terminal 9 of a ground investigation company or the like, the server device 8 provides the ground investigation data to the client terminal.

[0009] In this embodiment, to prevent tampering with the ground investigation position, the system collects position information from the investigation machine main body 3 and position information from the control device 4, which is directly connected to the investigation machine main body 3 by a cable. The ground investigation position tampering prevention system 1 is equipped with a position information acquisition device 6 that is detachable from the rod of the investigation machine main body 3 to collect the position information of the investigation machine main body 3. The position information acquisition device 6 is equipped with a GPS antenna that receives GPS signals transmitted from GPS satellites. Furthermore, to collect the position information of the control device 4, the relay device 5 built into the control device 4 is equipped with a GPS antenna. The GPS antenna provided in the position information acquisition device 6 is distinguished as the first GPS antenna, and the GPS antenna provided in the relay device 5 is distinguished as the second GPS antenna.

[0010] The soil investigation machine 2 is composed of, for example, a Swedish sounding automatic penetration testing machine main body (investigation machine main body 3) that measures penetration resistance to investigate the hardness, compaction, soil quality and soil layer structure of the soil at multiple measurement positions in the soil investigation area, and a control device 4 that controls the investigation machine main body 3.

[0011] The main body of the survey machine 3 consists of a rod, a stand that supports the rod vertically to the ground, weights for applying loads of 50 kg, 75 kg, 100 kg, etc. to the rod, a rotation mechanism that drives the rod to rotate about its axis, a sensor that detects the penetration depth, etc. The load WSW and the number of half rotations Na required for the rod to penetrate are measured together with the depth as the penetration resistance.

[0012] The control device 4 includes hardware such as a processor, RAM, ROM, a storage device 41, and a start switch 49. A ground investigation program is stored in the storage device 41. As shown in Fig. 2, when the processor executes the ground investigation program, the control device 4 functions as a control unit 40, a data communication unit 46, a ground investigation data generation unit 47, and an investigation machine main body control unit 48.

[0013] The control unit 40 controls each element of the control device 4. The ground investigation data generating unit 47 generates ground investigation data representing the correspondence between depth and penetration resistance based on sensor outputs and the like provided in the investigation machine main body 3. The ground investigation data generated by the ground investigation data generating unit 47 is stored in the storage device 41 by the control unit 40. The data communication unit 46 transmits and receives various information to and from the relay device 5 under the control of the control unit 40. Specifically, through processing by the data communication unit 46, the control device 4 transmits ground investigation data to the relay device 5 at a predetermined timing. When the start switch 49 is pressed, the control device 4 transmits a confirmation of the start of the ground investigation to the relay device 5 through processing by the data communication unit 46. In response to this, the control device 4 receives a start permission signal indicating that the investigation can be started or a start prohibition signal indicating that the investigation cannot be started from the relay device 5. The investigation machine main body control unit 48 starts controlling the investigation machine main body 3 in response to pressing the start switch 49 and receiving a start permission signal indicating that the investigation can be started from the relay device 5. When the survey machine main body control unit 48 receives a start disallowance signal from the relay device 5 indicating that start is not possible even if the start switch 49 is pressed, it does not start controlling the survey machine main body 3. In other words, the ground survey is not started.

[0014] The relay device 5 is a board on which various hardware components are mounted, and is directly connected to the serial port of the control device 4 via a cable. The relay device 5 includes hardware such as a processor, RAM, ROM, a storage device 51, a short-range wireless communication module for connecting to the information processing terminal 7, and a GPS module. The GPS module includes a second GPS antenna 52 that receives GPS signals transmitted from GPS satellites. The storage device 51 stores a program for the relay device of the ground investigation position tampering prevention system. When the processor executes the program for the relay device, the relay device 5 functions as a control unit 50, a table management unit 53, a GPS position calculation unit 57, a short-range wireless communication unit 58, and a data communication unit 56, as shown in FIG. 2.

[0015] The control unit 50 controls all the elements that make up the relay device 5. The storage device 51 stores the location information of the relay device 5, ground investigation data, and a start flag management table.

[0016] Under the control of the control unit 50, the GPS position calculation unit 57 calculates the position of the GPS antenna 52 (second GPS position) as needed based on the GPS signal received by the GPS antenna 52. The position of the GPS antenna 52 corresponds to the position of the relay device 5 and the position of the control device 4 in which the relay device 5 is built.

[0017] Under the control of the control unit 50, the short-range wireless communication unit 58 transmits and receives various information to and from the information processing terminal 7 using a short-range wireless communication standard. Specifically, through processing by the short-range wireless communication unit 58, the relay device 5 transmits ground investigation data, location information of the relay device 5, etc. to the information processing terminal 7. Through processing by the short-range wireless communication unit 58, the relay device 5 receives from the information processing terminal 7 a determination result as to whether or not the ground investigation by the ground investigation machine 2 can be started.

[0018] The table management unit 53 updates the start flag management table as needed based on the determination result received from the information processing terminal 7. When the determination result is positive, the table management unit 53 updates the "start permitted / start not permitted flag" item managed in the start flag management table to the numerical value "1" corresponding to "start permitted", and when the determination result is negative, the table management unit 53 updates the "start permitted / start not permitted flag" item to the numerical value "0" corresponding to "start not permitted". The "start permitted / start not permitted flag" item is initially set to the numerical value "0".

[0019] The data communication unit 56 transmits and receives various information to and from the control device 4 under the control of the control unit 50. Specifically, through processing by the data communication unit 56, the relay device 5 receives ground investigation data and confirmation of the start of the ground investigation from the control device 4. Through processing by the data communication unit 56, when the relay device 5 receives confirmation of the start of the ground investigation from the control device 4, if the "start permitted / start not permitted flag" item managed in the start flag management table is the value "1", the relay device 5 transmits a start permitted signal indicating that start is permitted to the control device 4, and if the "start permitted / start not permitted flag" item is the value "0" or blank, the relay device 5 transmits a start not permitted signal indicating that start is not permitted to the control device 4.

[0020] The position information acquisition device 6 is a device for acquiring the position of the rod of the soil investigation machine 2, i.e., position information of the location where the soil investigation was actually carried out, and is typically configured to be detachable from the end of the rod of the soil investigation machine 2. The position information acquisition device 6 includes hardware such as a processor, RAM, ROM, a storage device 61, a short-range wireless communication module for connecting to the information processing terminal 7, and a GPS module. The GPS module includes a first GPS antenna 62 that receives GPS signals transmitted from GPS satellites. A position information transmission program is stored in the storage device 61. When the processor executes the position information transmission program, the position information acquisition device 6 functions as a control unit 60, a GPS position calculation unit 67, and a short-range wireless communication unit 68, as shown in FIG. 3 .

[0021] The control unit 60 controls all the elements that make up the position information acquisition device 6. The storage device 61 stores the position information of the position information acquisition device 6. Under the control of the control unit 60, the GPS position calculation unit 67 calculates the position of the GPS antenna 62 (first GPS position) at any time based on the GPS signal received by the GPS antenna 62. The position of the GPS antenna 62 corresponds to the position of the position information acquisition device 6 and the position of the rod of the ground investigation machine 2 on which the position information acquisition device 6 is installed. Under the control of the control unit 60, the short-range wireless communication unit 68 transmits the position information of the position information acquisition device 6 to the information processing terminal 7 using a short-range wireless communication standard.

[0022] The information processing terminal 7 is a mobile information processing terminal such as a smartphone or tablet carried by an investigator who investigates the ground using the soil investigation machine 2. The information processing terminal 7 includes hardware such as a processor, RAM, ROM, a storage device 71, a display device 72, an input device 73, a wireless communication module for connecting to the server device 8, a short-range wireless communication module for connecting to the position information acquisition device 6, and a short-range wireless communication module for connecting to the relay device 5. An application for the information processing terminal of the ground investigation position tampering prevention system 1 is installed in the storage device 71. As the processor executes the application for the information processing terminal, the information processing terminal 7 functions as a control unit 70, a mobile wireless communication unit 74, a first short-range wireless communication unit 75, a second short-range wireless communication unit 76, a positional deviation calculation unit 77, an inter-device distance calculation unit 78, and a determination unit 79, as shown in FIG. 4 .

[0023] The control unit 70 controls all the elements that make up the information processing terminal 7. The storage device 71 stores information about the ground investigation site in association with a ground investigation ID that identifies the ground investigation. The information about the ground investigation site includes information about the address of the ground investigation site and multiple planned measurement locations in the ground investigation site. The storage device 71 stores the ground investigation data in association with the ground investigation ID, along with the location information of the location information acquisition device 6 and the location information of the relay device 5 (control device 4). The storage device 71 also stores information about the threshold value (first threshold value) for the positional deviation amount and the threshold value (second threshold value) for the distance between the devices as threshold setting information used in the determination process by the determination unit 79 (described later). It is desirable that this information be unchangeable so that it cannot be easily changed by the surveyor. This contributes to preventing tampering with the ground investigation location. Of course, this does not mean that the surveyor may change the information. The second threshold value is desirably set to be equal to or less than the length of the cable connecting the surveyor main body 3 and the control device 4. The second threshold value may be set manually or automatically. Even when the second threshold is set manually, inputting information identifying the cable used for the connection rather than directly inputting the cable length can prevent the investigator from intentionally setting the second threshold longer in order to falsify the ground investigation location. To automatically set the second threshold, for example, a table associating cable types with cable lengths can be maintained, and identification information such as a QR code (registered trademark) or barcode can be attached to the cable used for the connection to identify its type. This allows the type of cable used for the connection to be automatically identified and the cable length corresponding to the identified cable type to be automatically set. The display device 72 displays various pages related to the ground investigation under the control of the control unit 70. The input device 73 accepts input of various information from the investigator.

[0024] The mobile wireless communication unit 74 transmits the ground investigation data received from the relay device 5 together with the ground investigation ID to the server device 8. The mobile wireless communication unit 74 receives information about the ground investigation site selected by the investigator operating the input device 73 from the server device 8. The first short-range wireless communication unit 75 transmits and receives various information to and from the relay device 5. The information received from the relay device 5 includes the ground investigation data and position information of the relay device 5. The information transmitted to the relay device 5 includes the judgment result of the judgment unit 79 described below. The second short-range wireless communication unit 76 receives the position information of the position information acquisition device 6 from the position information acquisition device 6. When the ground investigation position has not been tampered with, the position of the position information acquisition device 6 corresponds to the position of the survey machine main body 3.

[0025] The positional deviation amount calculation unit 77 calculates the amount of deviation (positional deviation amount) of the position of the positional information acquisition device 6 from the planned measurement position based on the positional information of the planned measurement position and the positional information of the positional information acquisition device 6 acquired by the positional information acquisition device 6. Since the positional information of the positional information acquisition device 6 can be considered as the positional information of the survey machine main body 3, the positional deviation amount indicates how far the position of the survey machine main body 3 is from the planned measurement position.

[0026] The inter-device distance calculation unit 78 calculates the distance (inter-device distance) between the location information acquisition device 6 and the relay device 5 based on the location information of the location information acquisition device 6 acquired by the location information acquisition device 6 and the location information of the relay device 5 acquired by the relay device 5. Since the location information of the relay device 5 can be considered as the location information of the control device 4, the inter-device distance indicates how far apart the survey machine main body 3 and the control device 4 are.

[0027] The determination unit 79 determines whether the conditions for starting the ground investigation are met. Specifically, the determination unit 79 determines whether the ground investigation can be started by the ground investigation machine 2 based on the amount of positional misalignment and the inter-device distance. Specifically, the determination unit 79 compares the amount of positional misalignment with a first threshold and the inter-device distance with a second threshold. In this embodiment, the first threshold is 50 cm and the second threshold is 1 m. The determination unit 79 makes a positive determination when the amount of positional misalignment is 50 cm or less and the inter-device distance is 1 m or less, and makes a negative determination when the amount of positional misalignment is greater than 50 cm or the inter-device distance is greater than 1 m. In other words, the determination unit 79 makes a positive determination when the investigation machine main body 3 is installed at the planned measurement position or in a position close to the planned measurement position, and the investigation machine main body 3 and the control device 4 are installed in close proximity to each other. However, it makes a negative determination when the investigation machine main body 3 is installed far from the planned measurement position or the investigation machine main body 3 and the control device 4 are far from each other.

[0028] Hereinafter, with reference to FIG. 5, the determination process by the information processing terminal 7 necessary to start the operation of the surveyor main body 3 of the soil surveyor 2 will be described. As shown in FIG. 5, the information processing terminal 7 receives the position information of the position information acquisition device 6 from the position information acquisition device 6 (S01), and receives the position information of the relay device 5 from the relay device 5 (S02). As already explained, the position information of the position information acquisition device 6 can be regarded as the position information of the surveyor main body 3, and the position information of the relay device 5 can be regarded as the position information of the control device 4. The information processing terminal 7 calculates the amount of positional deviation of the position of the surveyor main body 3 from the planned measurement position based on the position information of the planned measurement position of the ground survey site and the position information of the position information acquisition device 6 (S03). If the amount of positional deviation is within 50 cm (S04; YES), the information processing terminal 7 calculates the inter-device distance between the surveyor main body 3 and the control device 4 based on the position information of the position information acquisition device 6 and the position information of the relay device 5 (S05). If the inter-device distance is within 1 m (S06; YES), the information processing terminal 7 transmits an investigation permission signal to the relay device 5 (S07). On the other hand, if the positional deviation is greater than 50 cm (S04; NO) or if the inter-device distance is greater than 1 m (S06; NO), the information processing terminal 7 transmits a start disallowance signal to the relay device 5 (S08).

[0029] 6, when the relay device 5 is started up, it initializes the start permission / start prohibition flag to the value "0" (S11). The start permission / start prohibition flag is updated every time a ground investigation permission signal or a ground investigation prohibition signal is received from the information processing terminal 7. When the relay device 5 receives a start permission signal from the information processing terminal 7 (S12; start permission signal), it updates the start permission / start prohibition flag to the value "1" indicating permission (S13). When the relay device 5 receives a start prohibition signal from the information processing terminal 7 (S12; start prohibition signal), it updates the start permission / start prohibition flag to the value "0" indicating prohibition (S14). The process of updating the start permission / start prohibition flag by the relay device 5 is repeatedly executed until the power of the relay device 5 is turned off (S15; NO), and is terminated when the power of the relay device 5 is turned off (S15; YES).

[0030] As shown in Figure 7, the control device 4 waits until the start switch 39 is pressed (S21; NO). When the start switch 39 is pressed (S21; YES), the control device 4 requests the relay device 5 to confirm the start of the ground investigation and checks the start permission / start prohibition flag (S22). When the start permission / start prohibition flag is "permitted" (S23; permitted), the control device 4 controls the investigation machine main body 3 according to the ground investigation program (S24). This starts the ground investigation by the investigation machine main body 3. When the start permission / start prohibition flag is "prohibited" (S23; prohibited), a warning sound is generated to notify the investigator that the conditions for starting the ground investigation by the ground investigation machine 2 have not been met (S25). At this time, the investigation machine main body 3 is in a standby state without operating, and the ground investigation is not started.

[0031] According to the ground investigation position tampering prevention system 1 described above, the information processing terminal 7 can control the start of ground investigation by the ground investigation machine 2 depending on whether or not the start conditions for the ground investigation by the ground investigation machine 2 are met. The start conditions are met when the investigation machine main body 3 is installed at the planned measurement position or a position close to the planned measurement position, and the investigation machine main body 3 and the control device 4 are installed in positions close to each other.

[0032] Specifically, when the survey machine main body 3 is installed within a range AR1 of 50 cm from the intended measurement position and the control device 4 is installed within a range AR2 of 1 m from the survey machine main body 3, it is determined that the conditions for starting the ground investigation are met, and the ground investigation using the ground investigation machine 2 can be started.

[0033] If the ground investigation is carried out normally, as shown in Figure 8, the investigation machine main body 3 is installed at the intended measurement location, and the control device 4 is installed within an area AR2 defined by the length of the cable from the investigation machine main body 3. The position information acquisition device 6 is attached to the rod of the investigation machine main body 3. According to the positional relationship of each device at this time, the conditions for starting the ground investigation are met, and the ground investigation can be started using the ground investigation machine 2.

[0034] In Figure 8, the surveyor body 3 is installed at the planned measurement location. However, positioning processing based on GPS signals involves some error. Therefore, it is more convenient to allow the surveyor body 3 to be installed within a predetermined range from the planned measurement location. As shown in Figure 9, the allowed range is set relatively narrow, for example, a 50 cm radius, so that it cannot be used to tamper with the survey location. In other words, the surveyor body 3 is installed within a range AR1 of 50 cm from the planned measurement location, and the control device 4 is installed within a range AR2 of 1 m from the surveyor body 3, determined by the cable length. The position information acquisition device 6 is attached to the rod of the surveyor body 3. Based on the relative positions of the devices at this time, the conditions for starting the ground investigation are met, and the ground investigation using the soil investigation device 2 can begin.

[0035] The ground investigation position tampering prevention system 1 according to this embodiment achieves the following effects by making the position information acquisition device 6 detachable from the survey machine main body 3 rather than built into the survey machine main body 3. That is, there is no need to equip the survey machine main body 3 with hardware for acquiring position information, such as a GPS module, and the existing survey machine main body 3 can be used as is. Furthermore, because it can be detached from the survey machine main body 3 during ground investigation, it is possible to avoid situations in which the GPS module or the like is damaged due to the effects of strong vibrations applied to the survey machine main body 3 during ground investigation.

[0036] However, by making the position information acquisition device 6 detachable from the surveyor body 3, there is a possibility that the ground investigation position may be tampered with. That is, if the surveyor body 3 is not installed at the planned measurement position, and only the position information acquisition device 6 is placed at the planned measurement position, it may be possible to make it appear as if the surveyor body 3 were installed at the planned measurement position. Even in such a case, as long as the start condition is met, the ground investigation by the soil investigation machine 2 can be started, and ground investigation data at a position other than the planned measurement position may be collected as ground investigation data at the planned measurement position. To prevent such tampering of the ground investigation position or to minimize its impact if it does occur, in this embodiment, two pieces of position information are acquired: the position information of the position information acquisition device 6 and the position information of the control device 4 (relay device 5), by utilizing the cable connection between the surveyor body 3 and the control device 4.

[0037] As shown in Figure 10, the process of determining the amount of positional deviation ensures that the position information acquisition device 6 is installed within a range AR1 of 50 cm from the planned measurement position. The process of determining the distance between devices ensures that the control device 4 is installed within a range AR2 of 1 m from the position information acquisition device 6. In other words, it is possible to ensure that the control device 4 is installed within 1 m 50 cm from the planned measurement position. Because the survey machine main body 3 is connected to the control device 4 via a 1 meter cable, it is guaranteed that the survey machine main body 3 is installed at least within 2 m 50 cm from the planned measurement position.

[0038] Using the distance from the surveyor body 3 to the control device 4 in the determination process, rather than the distance from the planned measurement location to the control device 4, provides the following advantages. Specifically, using the distance from the surveyor body 3 to the control device 4 in the determination process, rather than the distance from the planned measurement location to the control device 4, allows for stricter installation conditions to be imposed. Furthermore, if the distance from the planned measurement location to the control device 4 were used in the determination process, even if the surveyor body 3 and the control device 4 were in an unrealistic positional relationship, the start condition would be met and the ground investigation could begin if the surveyor body 3 was within 50 cm of the planned measurement location and the control device 4 was within 1.5 m of the planned measurement location. If the surveyor body 3 and the control device 4 were in an unrealistic positional relationship, the reliability of the ground investigation data acquired under that positional relationship would be reduced. Thus, to satisfy the possible positional relationship, this embodiment uses the distance from the surveyor body 3 to the control device 4 in the determination process, rather than the distance from the planned measurement location to the control device 4.

[0039] The ground investigation position tampering prevention system according to this embodiment collects position information from a position information acquisition device 6 that is detachable from the rod of the investigation machine main body 3, thereby reducing the motivation of investigators to tamper with the position of the investigation machine main body 3, i.e., the ground investigation position. Even if an investigator attempts to tamper with the ground investigation position without installing a position information acquisition device 6 on the investigation machine main body 3, the investigation machine main body 3 is connected to the control device 4 via a cable, and by acquiring position information from the control device 4, it is possible to determine the range within which the investigation machine main body 3 is installed from the planned measurement position.

[0040] If an investigator attempts to tamper with the ground investigation position, and wants to bring the actual location where the investigation device main body 3 is installed as close as possible to the planned measurement location, the first threshold value for the amount of positional deviation and the second threshold value for the distance between the devices can be set to smaller values.

[0041] The surveyor body 3 has the function of acquiring position information, allowing the accurate location of the actual ground survey to be acquired. However, due to various reasons, such as the need for vibration countermeasures and the need for approval from the manufacturer, it may be difficult to equip an existing surveyor body 3 with hardware for acquiring position information. According to the ground survey position tampering prevention system 1 of this embodiment, the position information acquisition device 6 is configured to be detachable from the surveyor body 3, thereby eliminating the need to install hardware for acquiring position information on the surveyor body 3. The risk of tampering with the installation location of the surveyor body 3, which occurs because the position information acquisition device 6 is detachable from the surveyor body 3, can be prevented or the impact of such tampering can be reduced by acquiring the position information of the position information acquisition device 6 and the position information of the control device 4 by utilizing the cable connection between the surveyor body 3 and the control device 4, thereby achieving effects comparable to those achieved when the surveyor body 3 is equipped with hardware for acquiring position information.

[0042] The GPS antenna 52 needs to be installed in the housing of the control device 4, but the function of the GPS position calculation unit 57 that calculates the position based on the GPS signal received by the GPS antenna 52 may be provided in the information processing terminal 7 or in the server device 8.

[0043] Although the GPS antenna 62 needs to be provided in the location information acquisition device 6, the function of the GPS location calculation unit 67 that calculates the location based on the GPS signal received by the GPS antenna 62 may be provided in the information processing terminal 7 or in the server device 8.

[0044] In this embodiment, it is essential that the GPS antenna 52 is provided on the housing of the control device 4 and the GPS antenna 62 is provided on the location information acquisition device 6 which is detachable from the rod of the survey machine main body 3, but other functions may be provided in a distributed manner in the information processing terminal 7, relay device 5, control device 4, and server device 8.

[0045] Therefore, in this embodiment, since the hardware of the soil investigation machine 2 could not be significantly changed, a relay device 5 having a location information acquisition function and a short-range wireless communication function is connected to the control device 4 of the soil investigation machine 2, but if the hardware of the soil investigation machine 2 can be significantly changed, the control device 4 may be configured to have the location information acquisition function of the relay device 5 and a short-range wireless communication function, or may be configured to have a short-range wireless communication function or a location information acquisition function.

[0046] In addition, the location information acquisition device 6 and the relay device 5 may be configured to be directly connected to the server device 8 via the Internet 10, in which case the information processing terminal 7 is not required, and the functions of the information processing terminal 7 are provided in the server device 8, the relay device 5, the control device 4, etc.

[0047] In this embodiment, in order to determine whether the conditions for starting a ground investigation are met or not in the information processing terminal 7, the information processing terminal 7 is configured to have a positional deviation amount calculation unit 77, an inter-device distance calculation unit 78, and a determination unit 79. However, some or all of the above functions may be provided by the control device 4, the relay device 5, or the server device 8.

[0048] In this embodiment, if the start conditions for the ground investigation are not met, the ground investigation by the ground investigation machine 2 cannot be started. However, there are cases where the failure of the ground investigation start conditions is permitted, for example, when the investigation machine main body 3 is installed at a location other than the planned measurement location. Therefore, rather than preventing the start of the ground investigation by the ground investigation machine 2 when the ground investigation start conditions are not met, it is sufficient to allow the ground investigation by the ground investigation machine 2 to start, and to allow a third party to understand whether the ground investigation was conducted under the conditions for starting the ground investigation or not. For example, data indicating whether the ground investigation was conducted under the conditions for starting the ground investigation or not is added to the ground investigation data.

[0049] Of course, instead of attaching data on whether the conditions for starting the ground investigation are met or not, the ground investigation data may be attached with data on the amount of positional deviation and the distance between the devices, or may be attached with the positional information of the positional information acquisition device 6 and the positional information of the control device 4 (relay device 5). If the positional information of the positional information acquisition device 6 and the positional information of the relay device 5 (control device 4) are managed in association with the ground investigation ID, a third party can understand the positional relationship between the devices under which the ground investigation was carried out and can determine whether the ground investigation position has been tampered with.

[0050] In this embodiment, the surveyor body 3 and the control device 4 are connected by a cable, ensuring that the surveyor body 3 is installed within a range defined by the cable length from the control device 4. By positioning the control device 4 close to the intended measurement location, even if the position of the surveyor body 3 is tampered with, it is possible to prevent the surveyor body 3 from being placed far away from the intended measurement location and conducting a ground survey. As long as the distance between the surveyor body 3 and the control device 4 can be guaranteed, the surveyor body 3 and the control device 4 do not necessarily need to be connected by a wire such as a cable. For example, the surveyor body 3 and the control device 4 may be freely connected via a short-range wireless standard such as Bluetooth, and the distance between the surveyor body 3 and the control device 4 may be determined by detecting the communication strength, ensuring that the surveyor body 3 is located within a predetermined communication strength range from the control device 4. Alternatively, the surveyor body 3 and the control device 4 may each be equipped with a beacon transmitter and receiver solely for the purpose of detecting communication strength.

[0051] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents. [Explanation of symbols]

[0052] 7...information processing terminal, 70...control unit, 71...storage device, 72...display device, 73...input device, 74...mobile wireless communication unit, 75...first short-range wireless communication unit, 76...second short-range wireless communication unit, 77...positional deviation amount calculation unit, 78...inter-device distance calculation unit, 79...determination unit.

Claims

1. A ground investigation position tampering prevention system is applied to a ground investigation machine comprising an investigation machine main body that investigates the ground by penetrating a rod into the ground and a control device that controls the investigation machine main body, and prevents tampering with the ground investigation position, a first GPS antenna detachably mounted on the rod; a first position calculation unit that calculates a first GPS position based on the GPS signal received by the first GPS antenna; A second GPS antenna mounted on a control box of the ground surveying machine; a second position calculation unit that calculates a second GPS position based on the GPS signal received by the second GPS antenna; a positional deviation amount calculation unit that calculates a positional deviation amount of the first GPS position with respect to a planned position of the ground survey; an inter-device distance calculation unit that calculates an inter-device distance between the first GPS position and the second GPS position; A ground survey position tampering prevention system equipped with the above.

2. The ground investigation position tampering prevention system according to claim 1 , further comprising a transmitting unit that transmits data on the first GPS position and the second GPS position to an external server device.

3. a determination unit that determines whether or not a condition for starting a ground investigation by the investigation machine main body is met based on the positional deviation amount and the inter-device distance; a transmitting unit that transmits the result of the determination to the control device, The ground investigation position tampering prevention system according to claim 1 , wherein the control device allows the investigation machine body to start the ground investigation when the result of the determination is affirmative.

4. The ground investigation position tampering prevention system according to claim 3 , wherein the condition for starting the ground investigation is met when the amount of positional deviation is equal to or less than a first threshold value and the inter-device distance is equal to or less than a second threshold value.

5. The ground investigation position tampering prevention system according to claim 4 , wherein the second threshold is set to be equal to or less than the length of a cable connecting the investigation machine main body and the control device.

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