JP2009103579A - Apparatus, method and program for specifying buried position - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To precisely specify a position of a buried object buried in the ground, in an area on the ground. <P>SOLUTION: A reference point on an estimated buried position of the buried object is stored, and inputs representing distances of a plurality of points from the buried object, which are positioned on terrestrial lines intersecting the buried object and separated right and left so as to border at the reference point, are received. Then two points which are on the terrestrial lines bordering at the reference point and have the same distance from the buried object, are computed based on the distances from the buried object, and a position of the middle point of the two points is derived. An average of positions of two or more middle points is obtained, and the average position is specified as the buried position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an embedded position specifying device, an embedded position specifying method, and a program for specifying an embedded position of an embedded object such as a cable embedded in the ground on the ground surface.

Conventionally, as a method of detecting the laying position and depth of a cable buried in the ground, the magnetic field caused by electromagnetic waves generated by passing a current through the buried cable is detected at various positions on the ground surface, and the strength of the magnetic field A method of detecting the depth and the buried position from the current passed through the cable has been taken.
For example, Patent Document 1 describes a cable position information management system that creates a map from the intensity information of an electromagnetic wave transmitted by an embedded cable or a metal wire attached to the embedded cable and the position information of a point where the intensity of the electromagnetic wave is measured. Has been. Patent Document 2 discloses a technique related to a positioning device that searches for an underground conductor, for example, an embedded cable or a pipe.
JP 2004-109084 A US Pat. No. 5,920,194

However, the conventional buried position detection method has a problem that sufficient accuracy of buried position detection cannot be obtained. For example, if the buried cable is not so thick and there is an error of several centimeters in specifying the buried position, it may not reach the buried cable even if the underground of the specified buried position is dug down. It can be enormous. In addition, such construction needs to be carried out efficiently because it has a large public impact, such as when the road is closed.
The present invention has been made in view of the above points, and provides an embedded position specifying device, an embedded position specifying method, and a program for accurately specifying the position of an embedded object such as an embedded cable on the ground surface. Objective.

  In order to achieve the above-mentioned object, the present invention provides a reference point storage means for storing a reference point of the estimated position of the buried object, and a plurality of points on the ground line intersecting the buried object. The reference point is based on the distance from the embedded object and the embedded distance input receiving means for receiving the input of the distance from the embedded object at the plurality of points separated from the reference point on the left and right. An intermediate point calculating means for calculating the position of two points on the surface line with the same distance from the buried object, and calculating the position of the intermediate point between the two points, and the intermediate point An embedment position specifying means for obtaining an average of the positions of a plurality of intermediate points calculated by the calculation means and specifying the average position as an embedment position is provided.

  In the present invention, the position of the buried object such as the buried cable is specified on the ground surface, and based on the distance from the buried object calculated by the electronic device, the two points on the ground line with the reference point as a boundary, Then, the positions of two points having the same distance from the buried object are calculated, a plurality of positions of the intermediate points of the two points are calculated, and the average of the positions of the intermediate points is specified as the buried position. Here, the electronic device is detected at two points with electromagnetic wave detecting means for detecting the intensity of the electromagnetic wave transmitted from the embedded object or the electromagnetic wave transmitted from the embedded object at two points at different distances from the ground surface. Based on the intensity of the electromagnetic wave and the current value that generated the electromagnetic wave, the distance from the embedded object is calculated, and the distance from the embedded object is transmitted to the embedded position specifying device via the communication network. Moreover, the information on the embedded position specified by the embedded position specifying device is transmitted to the electronic device via the communication network.

  Further, the present invention is a reference point for the ground surface, the step of receiving an input of a reference point of the estimated position of the buried object, a plurality of points on the ground line intersecting the buried object, wherein the reference point is Two points on the surface line with the reference point as a boundary based on the step of receiving input of distances from the buried object at the plurality of points separated from each other on the right and left by the boundary, and the distance from the buried object. Calculating a position of two points having the same distance from the buried object, calculating a position of the intermediate point between the two points, obtaining an average of the calculated positions of the plurality of intermediate points, and calculating the average And a step of identifying the position of the buried object as a buried position.

  Further, according to the present invention, a computer having reference point storage means for storing a reference point of an estimated buried position of a buried object is a plurality of points on the ground line intersecting the buried object. And the embedded distance input receiving means for receiving the input of the distance from the embedded object at the plurality of points separated from each other on the left and right sides of the reference point, and the reference point as a boundary based on the distance from the embedded object. The intermediate point calculating means for calculating the position of two points on the surface line that are equal in distance from the buried object and calculating the position of the intermediate point between the two points, and the intermediate point calculating means This is a program for obtaining an average of the positions of a plurality of intermediate points calculated by the above and functioning as an embedded position specifying means for specifying the average position as an embedded position.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the precision of a specific position at the time of specifying the embed | buried position of a buried object on the ground surface.

  Hereinafter, preferred embodiments of an embedded position specifying device according to the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, the same reference numerals are given to components having substantially the same functional configuration, and redundant description will be omitted.

  FIG. 1 is a block diagram of an embedded position specifying system. The embedded position specifying system is configured by a combination of the detection device 3 and the portable terminal 5 or a combination of the communication network 2, the detection device 3, the server 7, and the storage device 8. The portable terminal 5 and the server 7 are embedded position specifying devices that specify the embedded position of the embedded cable 11 embedded in the ground. In addition, about the detail of this embodiment, the example in case the embedding position specific | specification system is comprised with the detection apparatus 3 and the portable terminal 5 is shown. The buried cable 11 is, for example, an optical fiber cable or a metallic cable. Alternatively, a buried metal pipe may be used instead of the buried cable 11.

The detection device 3 is an electronic device, and includes a detection unit 31, a storage unit 33, a display unit 35, a communication unit 37, and the like. The detection unit 31 detects a magnetic field (magnetic field strength B) generated by the embedded cable 11. The magnetic field generated by the embedded cable 11 is a magnetic field generated by a current that is transmitted directly to the embedded cable 11 by a transmitter connected to the embedded cable 11 and is conducted to the embedded cable. In addition to this, a method of generating a magnetic field based on a current held in the embedded cable 11 by holding the embedded cable 11 with a clamp, or a transmitter called a sonde that generates a signal itself is attached to the end of a wire rod or the like. However, there is a method in which a magnetic field is generated by feeding into a non-metallic buried pipeline.
The detection unit 31 calculates the embedding depth from the detected magnetic field strength and the current value that generated the magnetic field according to a depth calculation formula described later.

  The storage unit 33 stores detection results, calculation results, and the like detected by the detection unit 31. The display unit 35 displays detection results and calculation results by the detection unit 31, operation inputs and operation outputs of the detection device 3, and the like. The communication unit 37 performs communication with the server 7 via the mobile terminal 5 or the communication network 2.

The mobile terminal 5 and the server 7 are embedded position specifying devices that specify the embedded position of the embedded object.
The portable terminal 5 is a PDA terminal or the like, and includes a control unit 51, a storage unit 53, a communication unit 55, and the like. The communication unit 55 receives a detection result or the like by the detection device 3. The control unit 51 performs processing for specifying the embedded position of the embedded cable 11 based on the detection result received by the communication unit 55. The storage unit 53 stores the detection result received by the communication unit 55, the embedded position specifying process program, the embedded position specifying process result, and the like. The detection device 3 and the portable terminal 5 can be integrated.

The server 7 is a computer, has a control unit, a communication unit, and the like, and is connected to the storage device 8. The communication unit 55 of the server 7 receives detection results and the like from the detection device 3 via the communication network 2. The control unit 51 of the server 7 performs processing for specifying the embedded position of the embedded cable 11 based on the received detection result. The storage device 8 stores the detection result received from the detection device 3, the embedded position specifying process program, the embedded position specifying process result, and the like.
The server 7 further includes an input unit such as a keyboard and a mouse, and can receive a detection result from the detection device 3 as an input from the input unit.

Next, the position specifying process by the embedded position specifying device will be described.
FIG. 2 is a flowchart showing the flow of the position specifying process.
Here, although the case where the portable terminal 5 performs the position specifying process will be described, the server 7 may perform the same process.
The detection device 3 measures the magnetic field emitted from the embedded cable 11 on the ground surface, determines the reference point based on the coordinates of the reference point, the measurement result, and the like, and stores the position (step S201). The detection device 3 calculates the embedment depth from the magnetic field measured at a plurality of left and right points on the line intersecting the embedment cable with the reference point as a boundary (step S202), and transmits it to the mobile terminal 5.

  Next, the portable terminal 5 calculates the positions of two points on the line intersecting the buried cable with the reference point as the boundary and having the same buried depth, and calculates the intermediate position (step) S203), storing. If the calculated number of intermediate positions is insufficient (step S204), the process of step S203 is performed. If the calculated number of data at the intermediate position is sufficient (step S204), an average position of the calculated plurality of intermediate positions is obtained, and the embedded position is calculated (step S205).

Hereinafter, the processing of each step described above will be described in detail.
A reference point is determined from the measurement of the magnetic field by the detection device 3 and stored. This reference point is an estimated position from the end of the road where the buried cable 11 is laid.

FIG. 3 is a first diagram showing an outline of cable position detection by the detection device.
As shown in FIG. 3, first, using the detection device 3, the user moves on a line on the ground surface that intersects the embedded cable 11. FIG. 3 shows a cross-sectional view based on the ground line. It is assumed that the magnetic field detected by the detection device 3 is in the horizontal direction at the point of the PB immediately above the embedded cable 11, and the magnetic field is in the clockwise direction of a circle centering on the embedded cable 11. At this time, the direction and intensity of the magnetic field in the detection device 3 change when moving left and right on the ground line intersecting the buried cable 11 with the PB point as a reference. That is, the magnetic field is in the upper right direction at the PA point, the magnetic field is in the horizontal direction at the PB point, and the magnetic field is in the lower right direction at the PC point. In FIG. 3, it is assumed that the current flowing through the embedded cable 11 is flowing in the direction from the front side of the paper to the back side. An induced current flows through the vertical coil 43 by this magnetic field. And it can be determined whether the detection part 31 of the detection apparatus 3 is located on the buried cable 11 with the magnitude | size of the value of this induced current. Here, it can be determined that the point of the PB having the smallest induced current (the induced current value 0 in FIG. 3) is on the buried cable 11.

FIG. 4 is a second diagram showing an outline of the detection of the cable position by the detection device.
When the approximate position on the embedded cable 11 is determined by the method shown in FIG. 3, the detection device 3 then causes the horizontal coil 41-1 to operate according to an instruction from the user (such as pressing a button for starting the next process). Further, a more detailed position immediately above the embedded cable 11 is determined by the processing of the horizontal coil 41-2. As shown in FIG. 4, since the magnetic field in the horizontal coil 41-1 or 41-2 is horizontal at the position of PB2 directly above the buried cable, the induced current value is small or becomes zero. Further, by shifting to the position of PB1 or PB3, the magnetic field in the horizontal coil 41-1 or 41-2 of the detection device 3 crosses the horizontal coil 41-1 or 41-2, so that an induced current is generated. Therefore, it can be determined that the position where the induced current value is the smallest (for example, the position where the induced current is 0) is the shortest distance from the buried cable 11 (that is, directly above the buried cable 11). Then, a display as shown in FIG. 4B is displayed on the display unit 35 of the detection device 3. That is, when the current value is the lowest, the indicator display is maximized. Thus, the reference position is determined by the user pressing a button or the like. Then, the distance from the end of the road at the reference position is input to the detection device 3. The portable terminal 5 receives the input of the position information (distance from the road bridge) of the reference point, determines the reference point, and stores it in the memory or the like.

Next, the detection device 3 calculates the depth from the buried cable 11 to the ground surface at a plurality of left and right points with the reference point as a boundary.
FIG. 5 is a diagram showing an outline of calculation of the distance of the embedded object in the detection device.
When the transmitter 61 transmits a signal, a current I flows through the embedded cable 11 connected to the transmitter 61. When the current I flows through the buried cable 11, an electromagnetic wave is generated around the buried cable 11, and the detection device 3 detects a magnetic field at the installation point. The detection unit 31 of the detection device 3 includes horizontal coils 41-1 and 41-2 and a vertical coil 43, and conducts the magnetic field strength detected at the positions of the horizontal coils 41-1 and 41-2 and the embedded cable 11. Based on the current value I, the distance H between the ground surface and the buried object (buried cable 11) is obtained from the depth calculation formula.

For example, in FIG. 3, the magnetic field intensity B1 and the magnetic field intensity B2 are detected, the distance between the horizontal coil 41-1 and the horizontal coil 41-2 is X, the distance between the horizontal coil 41-2 and the ground surface is h, and immediately below the detection device 3. If the distance (depth) between the position of the surface of the earth and the buried object is H, and the distance from the buried object to the horizontal coil 41-2 is D,
Magnetic field strength B1 = K · I ÷ D
Magnetic field strength B2 = K · I ÷ (D + X)
If these two equations are used,
D = X · B2 ÷ (B1-B2)
It can be expressed as. Further, since H = D−h, as a result, the distance (depth) between the position of the ground surface directly below the detection device 3 and the buried object can be calculated as H. K is a coefficient.

  And the detection apparatus 3 calculates the value of the depth H at a plurality of points on the surface line intersecting the embedded cable 11 and separated from the reference point to the left and right based on an instruction from the user. To do.

FIG. 6 is a diagram showing a depth measurement table at a plurality of points on the surface line intersecting with the buried cable.
As shown in this figure, it is assumed that the detection device 3 has received an instruction to calculate the depth H and calculated each depth H at a total of 11 positions. In FIG. 6, the depth at the reference point lo (distance H from the ground surface to the buried cable) is 204 cm, the depth at the point moved 10 cm right (+) from the reference point is 204 cm, and moved right (+) 20 cm from the reference point. The depth at the point is 205 cm, the depth at the point moved 30 cm to the right (+) from the reference point is 208 cm, the depth at the point moved 40 cm to the right (+) from the reference point is 211 cm, and the depth from the reference point is moved to the right (+) 50 cm The depth at this point is 220 cm. In FIG. 6, the depth at the point moved 10 cm to the left (−) from the reference point is 207 cm, the depth at the point moved 20 cm to the left (−) from the reference point is 211 cm, and the point moved 30 cm to the left (−) from the reference point The depth at 216 cm is assumed to be 221 cm at the point moved left (−) 40 cm from the reference point, and the depth at the point moved 50 cm left (−) from the reference point is 231 cm. Then, the information shown in FIG. 6 is transferred from the detection device 3 to the portable terminal 5 by a user operation.

FIG. 7 is a diagram illustrating the calculation result of the intermediate point in the mobile terminal.
Next, each piece of information shown in FIG. 6 (a distance from the road edge of the reference point, a depth at the reference point, a plurality of points on the ground line intersecting the buried cable, and a plurality of points separated from the reference point to the left and right) The user instructs the mobile terminal 5 that has received the input (depth at the point) to start processing. Then, the mobile terminal 5 calculates the positions of two points on the ground line with the reference point as a boundary and the two distances equal to the embedded cable 11 based on the distance from the embedded cable 11. The position of the midpoint of the points is calculated. That is, as shown in FIG. 7, the control unit 51 of the mobile terminal 5 derives the distance from the reference point of the point having the smallest depth of 204 cm and calculates the intermediate point. Here, since the distance from the reference point of the point having a depth of 204 cm is 0 cm (reference point) and the position 10 cm to the right from the reference point, the intermediate point is a point moved 5 cm to the right from the reference point. And can be calculated.

  In addition, the control unit 51 of the portable terminal 5 specifies the depth 205 cm having the next smallest value, and determines an intermediate point between the right position 20 cm where the depth 205 cm is detected and the left position (−) 3.3 cm. Point = 20 + (− 3.3) /2≈8.3. The intermediate point is a value obtained by rounding down the second decimal place. Further, the movement distance when moving leftward from the reference point having a depth of 205 cm is calculated by interpolation calculation. That is, since the depth at the reference point is 204 cm and the depth of the position moved 10 cm to the left (−) is 207 cm, the moving distance in the left direction from the reference point when the depth is 205 cm is calculated by interpolation calculation. Distance = (207−204) ÷ (0 − (− 10)) = (−) 3.3 cm. Similarly, the control unit 51 of the mobile terminal 5 specifies the depth 207 cm having the next smallest value, the left position (−) 10 cm at which the depth 207 cm is detected, and the right estimated to detect the same depth. The intermediate point of the distance 26.7 cm from the reference point in the direction = (− 10) + 26.7 / 2≈8.3 cm. Similarly, the left and right positions estimated to detect the movement distance from the reference point of the intermediate point of the left and right positions estimated to detect the depth of 208 cm (left and right positions from the reference point) ≈ 8.8 cm and the depth of 211 cm. The movement distance from the reference point of the intermediate point (left and right position from the reference point) ≈ 10 cm, and the left and right positions estimated to detect the depth of 216 cm (left and right position from the reference point) from the reference point of the intermediate point It is calculated that the moving distance from the reference point of the middle point of the left and right positions (left and right positions from the reference point) estimated to detect the moving distance ≈7.8 cm and the depth 220 cm is approximately 6.0 cm. And the control part 51 of the portable terminal 5 calculates the average of the movement distance from the reference point of an intermediate point. It is assumed that the moving distance of the intermediate point from the reference point is 7.74 cm.

FIG. 8 is a diagram showing an outline of the calculation process of the movement distance from the reference point of the intermediate point.
As shown in FIG. 8, the control unit 51 of the mobile terminal 5 sets the movement distance from the reference point at the midpoint of the left and right positions (left and right positions from the reference point) estimated to detect the depth of 204 cm, the depth of 205 cm. The distance between the left and right positions (right and left positions from the reference point) estimated to be detected is the middle of the movement distance from the reference point and the left and right positions (left and right positions from the reference point) that are estimated to be detected at a depth of 207 cm. The movement distance from the reference point of the middle point of the left and right positions (left and right positions from the reference point) estimated to detect the movement distance of the point from the reference point and the depth 208 cm. The movement distance from the reference point of the intermediate point of the position (left and right position from the reference point), the movement from the reference point of the intermediate point of the left and right position (left and right position from the reference point) estimated to detect a depth of 216 cm distance Moving distance from the reference point of the midpoint of the positions of the right and left to be estimated to detect the depth 220 cm (positions of the left and right from the reference point), it is calculated. Since the average ls is 7.7 cm (rounded down to the second decimal place), the control unit 51 of the mobile terminal 5 calculates the distance l = lo + ls = 192 + 7.7 = 197.7 from the road end of the embedded cable 11. To do. And the control part 51 of the portable terminal 5 specifies 197.7 cm as an embedding position, and displays the value.

  As mentioned above, although embodiment of this invention was described, according to the process of the above-mentioned portable terminal 5, it calculates | requires and correct | amends the position of the embedded object calculated | required only with the detection apparatus 3 conventionally by several measurement information. Therefore, the position of the buried object can be specified more accurately than before.

  In the present embodiment, the case where the specific process of the embedded position is performed by the mobile terminal 5 is illustrated, but the server 7 may perform the process of the mobile terminal 5. In that case, the communication unit 37 of the detection device 3 connects the server 7 connected via the communication network 2 with various information measured by the detection device 3 (distance from the road end of the reference point, depth at the reference point, buried cable) And a communication unit 37 that transmits a plurality of points on the surface line intersecting with each other and depths at a plurality of points separated from the reference point to the left and right. Further, the server 7 transmits the calculated value of the embedded position to the detection device 3 via the communication network 2, and the detection device 3 displays the value of the embedded position. Alternatively, various information measured by the detection device 3 may be manually input to the server 7 by the user, and the server 7 may calculate the embedded position based on the information. The detection device 3 may have the function of the mobile terminal 5.

  Each of the above devices has a computer system inside. The process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

  As described above, according to the present invention, the position of the buried object is accurately obtained on the ground by using the electromagnetic wave from the buried object such as the buried cable buried in the ground or the transmitter attached to the buried object. It becomes possible to specify.

It is a block block diagram of an embedment position specifying system. It is a flowchart which shows the flow of a position specific process. It is a 1st figure which shows the outline of a detection of the cable position by a detection apparatus. It is a 2nd figure which shows the detection outline of the cable position by a detection apparatus. It is a figure which shows the calculation outline | summary of the distance of the embedded object in a detection apparatus. It is a figure which shows the measurement table | surface of the depth in the some point on the surface line which cross | intersects a buried cable. It is a figure which shows the waypoint calculation result in a portable terminal. It is a figure which shows the outline | summary of the calculation process of the movement distance from the reference point of an intermediate point.

Explanation of symbols

2 ......... Communication network 3 ......... Detection device 5 ......... Mobile terminal 7 ......... Server 11 ......... Embedded cable 31 ......... Detection unit 33 ......... Storage unit 35 ......... Communication unit 51 ... ... Control unit 53 ... Storage unit 55 ... Communication unit

Claims (5)

A reference point storage means for storing a reference point of the estimated position of the buried object, which is a reference point of the ground surface;
A plurality of points on the surface line intersecting with the buried object, the buried distance input receiving means for receiving an input of the distance from the buried object at the plurality of points separated from the reference point on the left and right,
Based on the distance from the buried object, two positions on the surface line with the reference point as a boundary, and the same distance from the buried object are calculated, and the intermediate point between the two points is calculated. Intermediate point calculation means for calculating the position;
An average of the positions of a plurality of intermediate points calculated by the intermediate point calculation means, and embedded position specifying means for specifying the average position as an embedded position;
An embedded position specifying device comprising: The buried distance input receiving means
Electromagnetic wave detection means for detecting the intensity of the electromagnetic wave transmitted from the embedded object or the electromagnetic wave transmitted from the embedded object at two points at different distances from the ground surface;
A distance calculating means for calculating a distance from the buried object based on the intensity of the electromagnetic wave detected at the two points and the current value that generated the electromagnetic wave;
The embedded position specifying apparatus according to claim 1, wherein a distance from the embedded object is received from an electronic device including a via a communication network, and an input is received.   3. The embedded position specifying device according to claim 2, further comprising embedded position notifying means for transmitting information on the specified embedded position to the electronic device via the communication network. Receiving an input of a reference point for a ground estimated position of a buried object, which is a ground reference point;
A plurality of points on the surface line intersecting with the buried object, the step of receiving input of distances from the buried object at the plurality of points separated from the reference point on the left and right;
Based on the distance from the buried object, two positions on the surface line with the reference point as a boundary, and the same distance from the buried object are calculated, and the intermediate point between the two points is calculated. Calculating a position;
Obtaining an average of the calculated positions of the plurality of intermediate points, and specifying the average position as an embedded position;
A method for specifying the position of an embedded object, comprising: A computer having a reference point storage means for storing a reference point of a buried estimated position of a buried object, which is a reference point of the ground surface;
A plurality of points on the surface line intersecting with the buried object, the buried distance input receiving means for receiving an input of the distance from the buried object at the plurality of points separated from the reference point on the left and right,
Based on the distance from the buried object, two positions on the surface line with the reference point as a boundary, and the same distance from the buried object are calculated, and the intermediate point between the two points is calculated. Intermediate point calculation means for calculating the position;
An embedment position specifying unit that obtains an average of the positions of a plurality of intermediate points calculated by the intermediate point calculation unit and specifies the average position as an embedment position;
Program to function as.

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