JP2001183470A - System, method, and device for detecting buried structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system, method, and device for detecting a buried structure for detecting the existence, position, shape, or material and the like of the underground buried structure. SOLUTION: A lifting device 5-1 is supported by legs 6-1, makes a lifting pole 7-1 telescopic, and vertically moves a transmitter 9 provided for the tip of the lifting pole 7-1 in a shaft 4-1. Similarly, a lifting device 5-2 is supported by legs 6-2, makes a lifting pole 7-2 telescopic, and vertically moves a receiver 11 provided for the tip of the lifting pole 7-2 in a shaft 4-2. A computer 3 controls the lifting speed and distance and the like. The transmitter 9 transmits radio wave and the receiver 11 receives the radio waves. The computer 3 takes the received radio wave, and determines the existence, position, shape, or material and the like of a buried pipe 13, based on a waveform of the radio wave.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried object detection system and a buried object detection method for detecting a buried object in the ground when a new pipe for gas, water, electricity or the like is installed in the ground. , And a buried object detection device.

[0002]

2. Description of the Related Art When newly constructing a house or a building, it is necessary to newly install pipes for gas, water, electricity, etc. underground. In such a case, the approximate position and shape of the existing pipe can be estimated based on the piping diagram and the like.

[0003]

However, it is difficult to determine the exact position, shape, and the like of the existing pipe only from the piping diagram. In addition, buried objects other than piping may be buried in the ground, and the position, shape,
Detecting the material is also important for the safety of pipe laying work.

[0004] The present invention has been made in view of such problems, and an object thereof is to provide a buried object detection system for detecting the presence, location, shape, material, and the like of a buried object underground, a buried object. An object of the present invention is to provide a detection method and an embedded object detection device.

[0005]

According to a first aspect of the present invention, there is provided a buried object detection system for detecting an underground buried object, comprising a set of a transmitting antenna and a receiving antenna. , Elevating means for elevating the transmitting antenna and the receiving antenna, and determining means for determining the position of an underground object, two vertical shafts are provided on the ground, and the first elevating means comprises The transmitting antenna is moved in a shaft, the receiving antenna is moved in a second shaft at a similar speed from a similar height, and the receiving antenna is configured to transmit a radio wave transmitted by the transmitting antenna. Receiving, said determining means,
A buried object detection system characterized in that a position of the buried object is determined from a waveform of a radio wave received by the receiving antenna.

A second invention is a buried object detection system for detecting an underground buried object, comprising a pair of transmitting antenna and receiving antenna, and elevating means for elevating the transmitting antenna and the receiving antenna. And determining means for determining the position of an underground object, two vertical shafts are provided on the ground, and the elevating means includes the transmitting antenna in the first vertical shaft,
In the second shaft, the receiving antenna is moved at a similar speed from different heights, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit includes A buried object detection system characterized by determining the position of an buried object from a waveform of a radio wave received by an antenna.

[0007] A third invention is a buried object detection system for detecting a buried object in the ground, comprising a set of transmitting antenna and receiving antenna, and elevating means for elevating the transmitting antenna and receiving antenna. And determining means for determining the position of the buried object underground, provided with two vertical shafts on the ground, the determining means, the transmitting antenna in the first vertical shaft,
When the receiving antenna is moved at the same speed from the same height in the second shaft, the radio wave received by the receiving antenna and the transmitting antenna in the first shaft are When the receiving antenna is moved at a similar speed from different heights in the second shaft, the position of the buried object is determined using radio waves received by the receiving antenna. Buried object detection system. Here, the third invention is a combination of the first invention and the second invention.

According to a fourth aspect of the present invention, there is provided a buried object detection system for detecting a buried object in the ground, comprising a pair of transmitting antenna and receiving antenna, and elevating means for elevating the transmitting antenna and the receiving antenna. And determining means for determining the position of an underground object, two vertical shafts are provided on the ground, and the elevating means includes the transmitting antenna in the first vertical shaft,
The receiving antenna is moved at different speeds from different heights in the second shaft, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determination unit determines that the receiving antenna is An embedded object detection system is characterized in that the position of an embedded object is determined from a waveform of a received radio wave.

According to a fifth aspect of the present invention, there is provided a buried object detection system for detecting a buried object in the ground, comprising a set of a transmitting antenna and a receiving antenna, and elevating means for elevating the transmitting antenna and the receiving antenna. And a judging means for judging the position of a buried object in the ground, wherein two vertical shafts are provided on the ground, and the elevating means comprises a transmitting antenna and a receiving antenna at a predetermined depth in the first vertical shaft. One of the antennas is fixed, and the other antenna is moved in the second shaft, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit includes: A buried object detection system characterized in that a position of an buried object is determined from a waveform of a radio wave received by a receiving antenna.

In the fifth invention, the radio waves received by the receiving antenna at different depths are superimposed, or the radio waves transmitted by the transmitting antenna at different depths and superimposed on the radio waves received by the receiving antenna are further enhanced in sensitivity. The position of the buried object can be detected.

The first to fifth inventions are buried object detection systems for detecting the position of a buried object. The presence / absence, shape, and material of the buried object can be detected by a similar system.

A sixth invention is a method for detecting a buried object in the ground, comprising: providing two vertical shafts on the ground, including a transmitting antenna in the first vertical shaft, and a second vertical shaft. The receiving antenna is moved at the same speed from the same height within the same, and the receiving antenna receives the radio wave transmitted from the transmitting antenna at every predetermined height, and From the waveform of the radio wave received by the antenna for
An embedded object detection method is characterized by determining a position, a shape, and a material.

[0013] A seventh invention is a method of detecting a buried object underground, in which two vertical shafts are provided on the ground, and a transmitting antenna is provided in the first vertical shaft and a transmission antenna is provided in the second vertical shaft. The receiving antenna is moved at a similar speed from different heights, and the receiving antenna receives a radio wave transmitted from the transmitting antenna at every predetermined height, and the receiving antenna receives the radio wave. A method of detecting a buried object, characterized by determining the presence, location, shape, and material of the buried object from the waveform of the radio wave.

An eighth invention is a method for detecting a buried object in the ground, wherein two shafts are provided on the ground, and a transmitting antenna is provided in the first shaft, and a transmitting antenna is provided in the second shaft. Move the receiving antenna from the same height at the same speed,
The receiving antenna, for each predetermined height, a first receiving step of receiving a radio wave transmitted from the transmitting antenna, a transmitting antenna in the first shaft, receiving in the second shaft The antenna for, from a different height, to move at the same speed, the receiving antenna, for each predetermined height, a second receiving step of receiving a radio wave transmitted from the transmitting antenna, Having an embedded object, wherein in the first receiving step and the second receiving step, the presence / absence, position, shape, and material of the embedded object are determined using a radio wave received by the receiving antenna. It is a detection method.

A ninth invention is a buried object detection method for detecting an buried object in the ground, in which two vertical shafts are provided on the ground, a transmitting antenna is provided in the first vertical shaft, and a transmitting antenna is provided in the second vertical shaft. The receiving antenna is moved at different speeds from different heights, and the receiving antenna receives a radio wave transmitted from the transmitting antenna at each predetermined height, and the radio wave received by the receiving antenna. From the waveform of the presence or absence, position, shape,
This is a method of detecting a buried object, characterized by determining a material.

A tenth invention is a method of detecting a buried object in the ground, comprising the steps of: providing two shafts on the ground;
At a predetermined depth in the shaft, one of the transmitting antenna and the receiving antenna is fixed, and the other antenna is moved in the second shaft, and the receiving antenna is A buried object detection method characterized by receiving a radio wave transmitted by an antenna and determining the presence, location, shape and material of the buried object from a waveform of the received radio wave.

An eleventh invention is a buried object detection device for detecting an buried object underground, comprising: a gantry supported by supporting legs;
An elevating device that is provided on the gantry and raises and lowers a wire rope; an extendable and retractable tubular body that is provided below the gantry, penetrates the wire rope therein, and has a fixed tip of the wire rope; And an antenna provided at the tip of the cylindrical body.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an embedded object detection system 1 according to a first embodiment of the present invention. As shown in FIG.
-1, 4-2 are provided, and the buried object detection system 1 detects a buried object existing in an area between two shafts.

The embedded object detection system 1 includes a computer 3, lifting devices 5-1 and 5-2, legs 6-1 and 6-2, lifting poles 7-1 and 7-2 as cylindrical bodies, a transmitter 9, It comprises a receiver 11 and the like. The lifting device 5-1 is supported by the legs 6-1 to extend and retract the lifting pole 7-1.
The transmitter 9 provided at the tip of -1 is moved up and down in the shaft 4-1.

Similarly, the lifting / lowering device 5-2 is supported by the legs 6-2, and expands / contracts the lifting / lowering pole 7-2.
The receiver 11 provided at the end of the shaft 2 is moved up and down in the shaft 4-2. Here, the elevating speed, the depth, etc. of the transmitter 9 and the receiver 11 are controlled by the computer 3, and those data are held in the computer 3.

The transmitter 9 transmits a radio wave, and the receiver 11 receives the radio wave. The computer 3 captures the received radio wave, and determines the presence / absence, position, shape, material, and the like of the buried pipe 13 buried between the shafts 4-1 and 4-2 from the waveform of the radio wave.

Next, the configurations of the lifting devices 5-1 and 5-2, the lifting poles 7-1 and 7-2, the transmitter 9, and the receiver 11 will be described in detail. FIG. 2A shows a lifting device 5-1 and a leg 6.
FIG. 1 is a front view of a lifting pole 7-1. FIG. 2B is a side view of the lifting device 5-1 and the lifting pole 7-1, and FIG. 2C is a side view when the lifting pole 7-1 is contracted.

As shown in FIG. 2, the lifting device 5-1 is provided with a drum 29, a relay box 27, a rotary encoder 31, and a motor 33. The drum 29 is a motor 33
The lifting pole is expanded and contracted by the wire rope wound around the drum. Expansion and contraction of the lifting pole 7-1 will be described later.

The rotation speed and the like of the motor 33 may be instructed by the operator using the operation box 25 or may be instructed from the computer 3. An instruction signal such as a rotation speed given to the operation box 25 is transmitted through the cord 28 to the relay box 27.
And the motor 33 rotates.

The elevating device 5-1 described above is mounted on a support table, and the legs 6-1 support the support table. Lifting pole 7
-1 denotes guide cylinders 23-1, 23-2, 23- having different diameters.
3, 23-4,... The guide tube 23-1 houses the guide tube 23-2 inside the tube, and the guide tube 23-2 similarly houses the guide tube 23-3. The guide tube is as shown in FIG. 2 (c). Shrunk to

FIG. 3 shows the structure of the guide cylinder. For example, a groove 35- is formed outside the guide cylinders 23-2 and 23-3.
1 and 35-2, and guides 37-1 and 37-2 are provided inside.

The guide cylinder 23-3 is extended and contracted by sliding the guide 37-1 of the guide cylinder 23-2 along the groove 35-2. Each guide tube expands and contracts similarly. In this way, by aligning the guide 37, which is a projection, with the groove 35, the lifting pole can be extended and contracted straight. Note that a groove may not be provided outside the guide cylinder 23-1.

FIG. 4 is a diagram showing the transmitter 9. Transmitter 9
Has a high-frequency impedance conversion board 41, a board 45, an antenna 43, and a protective case 44. The antenna 43 is connected to a cable connected to the computer 3 or the like via the high-frequency impedance conversion board 41. The antenna 43 and the high-frequency impedance conversion board 41 are attached to a board 41 made of an insulator such as glass epoxy resin, and the board 41 is attached to a protective case 44. If the transmitting antenna 43 is a receiving antenna,
It becomes the receiver 11.

A bow-tie antenna is used as the antenna 43 shown in FIG. FIG. 5A shows a bowtie antenna 53.
5B is a diagram showing the directivity of the bowtie antenna 53 observed from the front direction H shown in FIG. 5A. As shown in FIG. 5A, the bow tie antenna 53 is made of a metal 55, and a high-frequency current is applied to a central portion thereof to generate a radio wave.

In the directivity shown in FIG. 5B, the arrow indicates the direction of the radio wave, and the longer the arrow, the stronger the radio wave. As shown in FIG. 5, when the metal 55 of the bow tie antenna 53 is arranged in the x direction, the directivity strongly spreads in the y direction. That is,
It is easier to generate and receive stronger radio waves in the y direction. Therefore, the bow tie antenna 53 is arranged in the transmitter 9 and the receiver 11 in consideration of a direction in which a strong radio wave is to be generated. Further, a plurality of bowtie antennas 53 can be combined and mounted on the transmitter 9 and the receiver 11.

In addition to the bowtie antenna, the antenna used in the present embodiment includes a dipole antenna, a slot antenna, a loop antenna, and the like. FIG. 6A shows an example of the configuration of the slot antenna 63, and FIG.
(A) Slot antenna 63 observed from above V
FIG. 6 is a diagram showing directivity of the image.

The slot antenna 63 shown in FIG. 6A is provided with a slit 65 in a cylindrical or flat metal, and a high-frequency current flows through the slit 65. The directivity of the slot antenna is radial in the case of the cylindrical slot antenna shown in FIG.

FIG. 7A shows an example of the configuration of the loop antenna 73, and FIG. 7B shows the directivity of the loop antenna 73 as viewed from the front H in FIG. 7A. Fig. 7
The loop antenna 73 shown in FIG. 7A is formed by feeding a metal wire or the like into a frame shape such as a circle. The directivity of the loop antenna 73 shown in FIG. 7B is small in the direction perpendicular to the frame surface and strong in the horizontal direction. The antennas having the desired directivity are mounted on the transmitter 9 and the receiver 11 by using the various antennas described above alone or in combination.

As shown in FIG. 4, the transmitter 9 is mounted on a guide cylinder at the tip of the lifting pole 7-1. The wire rope 47 penetrates through the inside of the guide tube, and is connected to a rope connection portion 49 inside the guide tube at the tip. Therefore, as described above, if the drum 29 of the elevating device 5-1 rotates and winds up the wire rope 47, the guide tube shrinks and the transmitter 9 rises, and conversely, if the wire rope 47 is rewound, the guide tube Extend and the transmitter 9 descends.

The lifting device 5-2 and the leg 6 shown in FIG.
2. The lifting pole 7-2 is connected to the lifting device 5-
1, the legs 6-1, and the lifting pole 7-1.

Next, a method of detecting the buried pipe 13 by the buried object detection system 1 will be described. 8, 9, and 10
FIG. 4 is an explanatory diagram of a detection method. 8, 9 and 10, 9-11, 9-12, ... indicate the transmitter 9 at each position, and 11-11, 11-12, ... indicate the receiver 11 at each position. This is shown for convenience.

Now, the transmitter 9 and the receiver 11 shown in FIG.
It is assumed that the vehicle descends in the shaft at approximately the same height at a similar speed. FIG. 8 shows the transmitter 9 and the receiver 11 at a predetermined height, and the transmitter 9-11 and the receiver 11-11,
The transmitter 9-12 and the receiver 11-12, and the transmitter 9-13 and the receiver 11-13 are located at almost the same height.

As shown in FIG. 8, a radio wave (shown by a dotted line) transmitted by a transmitter 9-11 is received by a receiver 11-11. FIG. 11 shows an example of the radio wave waveform transmitted by the transmitter 9, and FIG. 12 shows the frequency characteristics of the radio wave shown in FIG. As shown in FIGS. 11 and 12, the transmission radio wave is a pulse wave, and has a very high frequency.

Similarly, the radio wave transmitted by the transmitter 9-12 shown in FIG. 8 is received by the receiver 11-12, and the radio wave transmitted by the transmitter 9-13 is received by the receiver 11-13. The waveform data received at each position is sent to the computer 3 together with the position data and held.

Thus, in the computer 3, the position, shape, material, and the like of the buried pipe 13 are determined by comparing the received waveforms received by the receiver at each position or comparing the transmitted waveform and the received waveform at the same position. .

Next, as shown in FIG. 9, the receiver 11 is lowered from the position lower than the position of the transmitter 9 at the same speed as the transmitter 9 in the shaft. The receiver 11-21 transmits radio waves transmitted by the transmitter 9-21, the receiver 11-22 transmits radio waves transmitted by the transmitter 9-22, and the receiver 11-23 transmits radio waves transmitted by the transmitter 9-23. Receive.

Next, as shown in FIG. 10, the receiver 11 is lowered from a position higher than the position of the transmitter 9 at the same speed as the transmitter 9 in the shaft. The receiver 11-31 transmits radio waves transmitted by the transmitter 9-31, the receiver 11-32 transmits radio waves transmitted by the transmitter 9-32, and the receiver 11-33 transmits radio waves transmitted by the transmitter 9-33. Receive.

The waveform data received at each of the positions shown in FIGS. 9 and 10 is also sent to the computer 3 together with the position data and held. Thus, the position, shape, material, and the like of the buried pipe 13 can be accurately obtained by comparing the received waveforms received at the positions shown in FIGS. 8, 9, and 10 in the computer 3.

Next, other detection methods will be described. FIG. 13 is a diagram showing a detection method of lowering the transmitter 9-41 and the receiver 11-41 from different heights at the same speed and transmitting and receiving radio waves. Transmitter 9-41 at speed V
In step 1, the receiver 11-41 is moved down at the speed V2 to transmit and receive radio waves at a predetermined position. The computer 3 detects the buried pipe 13 from the start positions of the transmitters 9-41 and the receivers 11-41, the transmission / reception positions, speeds, reception waveforms, and the like. Note that the transmitter 9 and the receiver 11 may be moved at different speeds from different heights in the respective shafts.

In the detection method described above, the receiver 11 receives the radio wave transmitted by the transmitter 9, which is called a direct wave radar system. On the other hand, in the method described below, the receiver 11 receives a reflected wave of the radio wave transmitted by the transmitter 9 from the buried pipe 13 or the like.

As a method of detecting the reflected wave, there is a method of transmitting and receiving radio waves by fixing the transmitter 9 and lowering the receiver 11 as shown in FIGS. FIG. 14 shows that the transmitter 9-51 is fixed at a predetermined position, and the receiver is 11-5.
A detection method for transmitting and receiving radio waves by lowering to positions 1, 11, 52, and 11-53 will be described.

As shown in FIG. 14, the receivers 11-51,
Radio wave waveforms received by 11-52 and 11-53 include reflected waves from the buried pipe 13. Thus, each position 11-
The position and the like of the buried pipe 13 are detected from the waveforms received at 51, 11-52, and 11-53.

Similarly, in the method shown in FIG.
-61 is fixed at a predetermined position, and the receivers are 11-61, 1
It descends to the positions 1-62 and 11-63, transmits and receives radio waves, and detects the position and the like of the buried pipe 13 from the waveform received at each position. In the method shown in FIG. 16, the transmitter 9-71 is fixed at a predetermined position, and the receivers are 11-71, 11-7.
It is lowered to the position of 2, 11-73, and the same detection is performed.

Further, by superimposing (migrating) the waveforms obtained in FIG. 14, FIG. 15, and FIG. 16, the reflected wave reflected by the buried pipe 13 is emphasized, and the position of the buried pipe 13 is detected. Accuracy can be increased. Although the transmitter 9 is fixed in the detection methods shown in FIGS. 14 to 16, the same detection can be performed by fixing the receiver 11 and lowering the transmitter 9.

Next, the buried object and the waveform of the received radio wave will be described using specific examples. FIG. 17 is a diagram showing buried pipes buried at different depths and waveforms of received radio waves at each depth.

In the waveform shown in FIG. 17, the transmitter 9 is lowered in the shaft 4-3 and the receiver 11 is lowered in the shaft 4-4 in the format shown in FIG. 8, and the receiver 11 receives radio waves at each depth. FIG. Also, the buried pipes 13-1, 13 shown in FIG.
-2 is a polyethylene (PE) tube.

As shown in FIG. 17, the pulse arrival time from the ground to the depth at which the PE pipe exists is t1, whereas the pulse arrival time at the depth at which the PE pipe exists is earlier as t2, and the pulse waveform Becomes smaller. The earlier pulse arrival time is considered to be the effect of air inside the PE tube,
The decrease in the amplitude is due to the scattering of the PE tube surface.

From the waveform shown in FIG. 17, the buried pipe 1 is set at a depth where the pulse arrival time is short and the amplitude is small.
It is determined that 3-1 and 13-2 exist. Further, by examining the waveform at a more detailed depth or performing the above-described migration processing or the like, the buried pipe 13-1 and the buried pipe 13
It is also possible to distinguish the depth from -2.

As described above, the depth at which the PE tube exists, that is, the position, is determined from the pulse arrival time and the pulse amplitude. In FIG. 17, a waveform having a large amplitude near the ground surface is noise and is not used for detection.

Next, an example in which a buried pipe is buried in the ground in parallel will be described. The waveform shown in FIG. 18 is a waveform of a radio wave received by the receiver 11 at each depth by lowering the transmitter 9 in the shaft 4-5 and the receiver 11 in the shaft 4-6 in the format shown in FIG. is there. Also, the buried pipes 13-3 and 13 shown in FIG.
-4 and 13-5 are polyethylene (PE) tubes, which are buried at almost the same depth.

As in the case of FIG. 17, the buried pipe 13-3,
In the reception waveform at the depth where 13-4 and 13-5 are embedded, the arrival time of the pulse is short and the amplitude is small, and it is detected that the PE tube is embedded at that depth.

As described above, the depth, that is, the position where the PE tube exists is determined from the pulse arrival time and the pulse amplitude. In this case, the PE pipes are 13-3, 13-4, 13
-5, but the same result can be obtained even with one PE tube. Further, even if the buried pipe is made of another synthetic resin such as polypropylene, similar characteristics appear in the received waveform.

Further, by adding the results of the methods shown in FIGS. 9 and 10 and performing the above-described migration processing, the position and shape of the buried pipe can be known more accurately. FIG.
In FIG. 7, a difference occurs in the pulse arrival time between the region G1 and the region G2, which is due to the difference between the already dug region and the region not dug.

In the above description, the received waveform of the PE tube has been described as an example. However, it is also possible to determine the material of the tube from the received waveform. For example, in the case of a PE tube, as can be seen from the reception waveforms of FIGS. 17 and 18, the arrival time of the reception waveform at the depth where the PE tube exists is longer than the arrival time of the reception waveform at the depth where the metal tube does not exist. And the output appears early.

When the tube is made of metal, the amplitude of the received waveform at the depth where the metal tube exists is much smaller than the amplitude of the received waveform at the depth where the metal tube does not exist. The material of the buried object can be determined from such characteristics of the received waveform.

Next, the specification of the arrangement direction of the buried pipe will be described. 19 and 20 are explanatory diagrams for explaining the relationship between the vertical wave or horizontal wave and the arrangement of the buried pipe. An electric wave is one in which an electric field and a magnetic field propagate at right angles in space, and one in which the electric field is perpendicular to the ground is called a vertical wave, and one in which the electric field is parallel to the ground is called a horizontal wave.

19 and 20, when the xz plane is the ground and the waveform propagates in the x direction, the waveform shown in FIG. 19 is a vertical wave, and the waveform shown in FIG. 20 is a horizontal wave.
Here, when the arrangement of the buried pipe to be detected is perpendicular to the ground as in 13-6, the detection sensitivity is increased by the vertical wave, and when the arrangement of the buried pipe is parallel to the ground as in 13-7, the detection sensitivity is increased. Waves increase detection sensitivity.

Therefore, in the buried object detection system 1, the transmitter 9 is equipped with the vertical wave transmitting antenna and the horizontal wave transmitting antenna, and transmits both the vertical wave and the horizontal wave. By measuring whether the object is large or the like, the shape and arrangement of the buried object can be determined. In the present embodiment,
Although the transmitter 9 and the receiver 11 are lowered in the shaft, it is also possible to detect the buried object by lowering the shaft in advance and transmitting and receiving radio waves while raising the shaft.

[0064]

As described above, according to the present invention, it is possible to detect the presence, location, shape, material, and the like of an underground object.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embedded object detection system 1 according to an embodiment of the present invention.

FIG. 2 shows a lifting device and a lifting pole.

FIG. 3 is a view showing the structure of a guide cylinder.

FIG. 4 shows a transmitter.

FIG. 5 is a diagram showing a bow-tie antenna 55 and its directivity.

FIG. 6 is a diagram showing a slot antenna 63 and its directivity.

FIG. 7 is a diagram showing a loop antenna 73 and its directivity.

FIG. 8 is an explanatory diagram of a detection method when the transceiver is lowered at a constant speed.

FIG. 9 is an explanatory diagram of a detection method when the transceiver is lowered at a constant speed.

FIG. 10 is an explanatory diagram of a detection method when the transceiver is lowered at a constant speed.

FIG. 11 is a diagram showing a waveform of a transmission radio wave.

FIG. 12 is a diagram showing frequency characteristics of a transmission radio wave;

FIG. 13 is an explanatory diagram of a detection method when the transceiver is lowered at different speeds.

FIG. 14 is an explanatory diagram of a detection method when a transmitter is fixed.

FIG. 15 is an explanatory diagram of a detection method when a transmitter is fixed.

FIG. 16 is an explanatory diagram of a detection method when a transmitter is fixed.

FIG. 17 is a diagram showing a depth and a reception waveform of a buried PE pipe.

FIG. 18 is a diagram showing a depth and a reception waveform of a buried PE pipe.

FIG. 19 is an explanatory diagram of detection of an arrangement of a buried pipe by a vertical wave.

FIG. 20 is an explanatory diagram of detection of an arrangement of a buried pipe by a horizontal wave.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Buried object detection system 3 ... Computer 5-1, 5-2 ... Lifting device 6-1, 6-2 ... Leg 7-1, 7-2 ... Lifting pole 9 ... …… Transmitter 11 …… Receiver 13 ……… Buried pipe

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Kenji Suyama 1-5-20 Kaigan, Minato-ku, Tokyo Inside Tokyo Gas Co., Ltd. (72) Inventor Shinobu Satake 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Inside Gas Co., Ltd. (72) Inventor Mitsunori Komori 1-5-20 Kaigan, Minato-ku, Tokyo Inside Tokyo Gas Co., Ltd. (72) Inventor Hideo Tai 5-20-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (72) Inventor Jun Fujiwara 1-5-20 Kaigan, Minato-ku, Tokyo Inside Tokyo Gas Co., Ltd. (72) Inventor Motoyuki Sato 4-17-103 Katahira 1-chome, Aoba-ku, Miyagi Prefecture F-term (reference) 5J070 AB01 AC01 AD02 AD17 AE07 AE11 AK22 AL02

Claims (38)

[Claims] 1. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determining means for determining the position of the buried object, wherein two vertical shafts are provided on the ground, wherein the elevating means includes the transmitting antenna in a first vertical shaft and the receiving antenna in a second vertical shaft. The antenna is moved at a similar speed from a similar height, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines a waveform of the radio wave received by the receiving antenna. A buried object detection system, wherein the position of the buried object is determined from the information. 2. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determining means for determining the position of the buried object, wherein two vertical shafts are provided on the ground, wherein the elevating means includes the transmitting antenna in a first vertical shaft and the receiving antenna in a second vertical shaft. The antenna is moved at a similar speed from different heights, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit embeds the radio wave from the waveform of the radio wave received by the receiving antenna. A buried object detection system for determining a position of an object. 3. A buried object detection system for detecting a buried object in the ground, comprising: a set of a transmitting antenna and a receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determination means for determining the position of the buried object, provided with two shafts on the ground, wherein the determination means includes: the transmission antenna in a first shaft; and the reception antenna in a second shaft. When the antenna is moved at the same speed from the same height, the radio wave received by the receiving antenna, the transmitting antenna in the first shaft, and the receiving antenna in the second shaft. A buried object detection system characterized in that the position of a buried object is determined using radio waves received by the receiving antenna when the antenna for use is moved from different heights at the same speed. 4. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determining means for determining the position of the buried object, wherein two vertical shafts are provided on the ground, wherein the elevating means includes the transmitting antenna in a first vertical shaft and the receiving antenna in a second vertical shaft. The antenna is moved at different speeds from different heights, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines a buried object from a waveform of the radio wave received by the receiving antenna. A buried object detection system for determining a position. 5. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determining means for determining the position of the buried object, two vertical shafts are provided on the ground, and the elevating means includes a first vertical shaft having a predetermined depth within the transmitting antenna and the receiving antenna. Fixing one of the antennas, moving the other antenna in the second shaft, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines that the receiving antenna is A buried object detection system, wherein a position of an buried object is determined from a waveform of a received radio wave. 6. The receiving antenna receives radio waves transmitted from the transmitting antenna at different depths, and the determining unit superimposes a waveform of the radio wave received by the receiving antenna to determine a position of the buried object. The embedded object detection system according to claim 5, wherein: 7. The receiving antenna receives radio waves at different depths, and the determining unit confirms the position of the buried object by superimposing a waveform of the radio waves received by the receiving antenna. The embedded object detection system according to claim 5, wherein 8. A buried object detection system for detecting a buried object in the ground, comprising: a set of a transmitting antenna and a receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determination means for determining the shape of the buried object, two vertical shafts are provided on the ground, and the elevating means includes the transmitting antenna in a first vertical shaft and the receiving antenna in a second vertical shaft. The antenna is moved at a similar speed from a similar height, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines a waveform of the radio wave received by the receiving antenna. A buried object detection system, wherein the shape of the buried object is determined from the data. 9. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determination means for determining the shape of the buried object, two vertical shafts are provided on the ground, and the elevating means includes the transmitting antenna in a first vertical shaft and the receiving antenna in a second vertical shaft. The antenna is moved at a similar speed from different heights, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit embeds the radio wave from the waveform of the radio wave received by the receiving antenna. A buried object detection system characterized by determining a shape of an object. 10. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determination means for determining the shape of the buried object; two vertical shafts provided on the ground; the determination means comprising: the transmitting antenna in a first vertical shaft; and the receiving antenna in a second vertical shaft. When the antenna is moved at the same speed from the same height, the radio wave received by the receiving antenna, the transmitting antenna in the first shaft, and the receiving antenna in the second shaft. A buried object detecting system for determining the shape of the buried object using radio waves received by the receiving antenna when the antenna for use is moved from different heights at the same speed. 11. A buried object detection system for detecting a buried object in the ground, comprising: a set of a transmitting antenna and a receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determination means for determining the shape of the buried object, two vertical shafts are provided on the ground, and the elevating means includes the transmitting antenna in a first vertical shaft and the receiving antenna in a second vertical shaft. The antenna is moved at different speeds from different heights, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines a buried object from a waveform of the radio wave received by the receiving antenna. An embedded object detection system for determining a shape. 12. The transmitting antenna transmits a horizontal wave and a vertical wave, the receiving antenna receives the horizontal wave and the vertical wave, and the determination unit receives the horizontal wave and the vertical wave from the amplitude of the received horizontal wave. If the amplitude of the vertical wave is large, it is determined that the buried object is a structure horizontal to the ground, and if the amplitude of the received vertical wave is smaller than the amplitude of the received horizontal wave, the buried object is The buried object detection system according to any one of claims 8 to 11, wherein it is determined that the structure is perpendicular to the ground. 13. A buried object detection system for detecting a buried object in the ground, comprising: a set of a transmitting antenna and a receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determination means for determining the shape of the buried object, two vertical shafts are provided on the ground, and the elevating means includes a first vertical shaft having a predetermined depth within the first transmitting shaft and the receiving antenna. Fixing one of the antennas, moving the other antenna in the second shaft, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines that the receiving antenna is A buried object detection system, wherein a shape of the buried object is determined from a waveform of a received radio wave. 14. The receiving antenna receives radio waves transmitted from the transmitting antenna at different depths, and the determining unit superimposes a waveform of the radio wave received by the receiving antenna to form a buried object. 14. The buried object detection system according to claim 13, wherein: 15. The receiving antenna receives radio waves at different depths, and the determining unit checks the shape of the buried object by superimposing a waveform of the radio waves received by the receiving antenna. 14. The buried object detection system according to claim 13. 16. A buried object detection system for detecting a buried object in the ground, comprising: a set of a transmitting antenna and a receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determining means for determining the material of the buried object, two vertical shafts being provided on the ground, the elevating means including the transmitting antenna in a first vertical shaft, and the receiving antenna in a second vertical shaft. The antenna is moved at a similar speed from a similar height, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines a waveform of the radio wave received by the receiving antenna. A buried object detection system, wherein the material of the buried object is determined from the information. 17. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determining means for determining the material of the buried object, two vertical shafts being provided on the ground, the elevating means including the transmitting antenna in a first vertical shaft, and the receiving antenna in a second vertical shaft. The antenna is moved at a similar speed from different heights, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit embeds the radio wave from the waveform of the radio wave received by the receiving antenna. A buried object detection system for determining the material of an object. 18. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determination means for determining the material of the buried object, two vertical shafts are provided on the ground, wherein the determination means includes: the transmitting antenna in a first vertical shaft; and the receiving antenna in a second vertical shaft. When the antenna is moved at the same speed from the same height, the radio wave received by the receiving antenna, the transmitting antenna in the first shaft, and the receiving antenna in the second shaft. When the antenna for moving, from a different height at a similar speed, using the radio waves received by the receiving antenna, the material of the buried object is determined, characterized in that The buried object detection system according to the above. 19. The determining means, wherein at a certain height, the output of a radio wave received by the receiving antenna appears earlier than the output of a radio wave received at a material of another height, and the amplitude of the radio wave is reduced. When the amplitude is smaller than the amplitude received by the material of another height, the embedded material is present in the material, and the material of the embedded material is determined to be a synthetic resin such as polyethylene or polypropylene. An embedded object detection system according to any one of claims 16 to 18. 20. When the amplitude of a radio wave received by the receiving antenna at a certain height is very small as compared with the amplitude received by a material of another height, the judging means judges whether the radio wave is buried in the material. 20. The method according to claim 16, wherein the material of the buried object is determined to be metal.
A buried object detection system according to any one of the above. 21. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for raising and lowering the transmitting antenna and the receiving antenna; Determining means for determining the material of the buried object, two vertical shafts being provided on the ground, the elevating means including the transmitting antenna in a first vertical shaft, and the receiving antenna in a second vertical shaft. The antenna is moved at different speeds from different heights, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines a buried object from a waveform of the radio wave received by the receiving antenna. A buried object detection system characterized by determining a material. 22. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for lifting and lowering the transmitting antenna and the receiving antenna; Determining means for judging the material of the buried object, two vertical shafts are provided on the ground, and the elevating means is provided at a predetermined depth in the first vertical shaft between the transmitting antenna and the receiving antenna. Fixing one of the antennas, moving the other antenna in the second shaft, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines that the receiving antenna is A buried object detection system, wherein a material of the buried object is determined from a waveform of a received radio wave. 23. The receiving antenna receives radio waves transmitted from the transmitting antenna at different depths, and the determining unit superimposes a waveform of the radio wave received by the receiving antenna to determine a material of the buried object. 23. The embedded object detection system according to claim 22, wherein the confirmation is made. 24. The reception antenna receives radio waves at different depths, and the determination unit checks the material of the buried object by superimposing a waveform of the radio waves received by the reception antenna. The embedded object detection system according to claim 22, wherein 25. An underground object detection system for detecting an underground object, comprising: a pair of transmitting antenna and receiving antenna; lifting means for elevating the transmitting antenna and receiving antenna; Determination means for determining the presence or absence of a buried object, wherein two vertical shafts are provided on the ground, and the elevating means moves the transmitting antenna in a first vertical shaft, and in a second vertical shaft, The receiving antenna is moved, the receiving antenna receives the radio wave transmitted by the transmitting antenna, and the determining unit is configured to control the transmitting antenna in a first shaft and the receiving antenna in a second shaft. When the antenna is moved at the same speed from the same height, the radio wave received by the receiving antenna, the transmitting antenna in the first shaft, and the receiving antenna in the second shaft. Antennas from different heights A buried object detection device, characterized in that the presence / absence of a buried object is determined by using a radio wave received by the receiving antenna when moving at a similar speed. 26. An underground object detection system for detecting an underground object, comprising: a pair of transmitting antenna and receiving antenna; lifting means for elevating the transmitting antenna and receiving antenna; Determination means for determining the presence or absence of a buried object, wherein two vertical shafts are provided on the ground, and the elevating means includes the transmitting antenna in a first vertical shaft and the receiving antenna in a second vertical shaft. The antenna is moved at different speeds from different heights, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines a buried object from a waveform of the radio wave received by the receiving antenna. A buried object detection system characterized by determining the presence or absence. 27. A buried object detection system for detecting a buried object in the ground, comprising: a pair of transmitting antenna and receiving antenna; lifting means for lifting and lowering the transmitting antenna and the receiving antenna; Determining means for determining the presence or absence of a buried object, wherein two vertical shafts are provided on the ground, and the elevating means comprises a first vertical shaft having a predetermined depth within the transmitting antenna and the receiving antenna. Fixing one of the antennas, moving the other antenna in the second shaft, the receiving antenna receives a radio wave transmitted by the transmitting antenna, and the determining unit determines that the receiving antenna is A buried object detection system for determining the presence or absence of a buried object from a waveform of a received radio wave. 28. The reception antenna receives radio waves transmitted from the transmission antenna at different depths, and the determining unit superimposes a waveform of the radio waves received by the reception antenna to determine whether an object is buried. 28. The embedded object detection system according to claim 27, wherein: 29. The reception antenna receives radio waves at different depths, and the determination unit checks the presence or absence of a buried object by superimposing a waveform of the radio waves received by the reception antenna. 28. The embedded object detection system according to claim 27. 30. A buried object detection method for detecting an buried object underground, comprising: providing two vertical shafts on the ground, a transmitting antenna in a first vertical shaft, and a receiving antenna in a second vertical shaft. Moving from the same height at the same speed, the receiving antenna receives a radio wave transmitted from the transmitting antenna at every predetermined height, and a radio wave received by the receiving antenna. A method of detecting a buried object, comprising determining the presence, position, shape, and material of the buried object from the waveforms of the above. 31. An embedded object detection method for detecting an embedded object in the ground, comprising: providing two vertical shafts on the ground, a transmitting antenna in the first vertical shaft, and a receiving antenna in the second vertical shaft. Moving from different heights at approximately the same speed, the receiving antenna receives a radio wave transmitted from the transmitting antenna at each predetermined height, and a waveform of the radio wave received by the receiving antenna. A method for detecting a buried object, comprising: determining the presence, location, shape, and material of the buried object from the object. 32. An embedded object detection method for detecting an embedded object in the ground, comprising: providing two vertical shafts on the ground; a transmitting antenna in a first vertical shaft; and a receiving antenna in a second vertical shaft. Moving from the same height at the same speed, the receiving antenna receives a radio wave transmitted from the transmitting antenna at every predetermined height, a first receiving step, The transmitting antenna is moved in the shaft, the receiving antenna is moved in the second shaft from different heights, at the same speed, and the receiving antenna is moved every predetermined height, and the transmitting antenna is moved. And a second receiving step of receiving a radio wave transmitted from the receiving antenna, in the first receiving step and the second receiving step, the presence or absence of the buried object using the radio wave received by the receiving antenna Buried object detection method characterized by determining the position, shape, and material 33. A buried object detection method for detecting an buried object underground, comprising: providing two vertical shafts on the ground, a transmitting antenna in the first vertical shaft, and a receiving antenna in the second vertical shaft. Moving from different heights at different speeds, the receiving antenna receives a radio wave transmitted from the transmitting antenna at each predetermined height, and embeds from a waveform of the radio wave received by the receiving antenna. A method for detecting a buried object, comprising determining the presence, location, shape, and material of the object. 34. An embedded object detection method for detecting an embedded object underground, comprising: providing two vertical shafts on the ground; and setting a predetermined depth in the first vertical shaft between the transmitting antenna and the receiving antenna. One of the antennas is fixed, and the other antenna is moved in the second shaft, and the receiving antenna receives a radio wave transmitted by the transmitting antenna, and determines whether or not there is a buried object based on a waveform of the received radio wave. ,
A method for detecting a buried object, comprising determining a position, a shape, and a material. 35. The receiving antenna receives radio waves transmitted from the transmitting antenna at different depths, and checks a material of the buried object by superimposing a waveform of the radio waves received by the receiving antenna. The method for detecting a buried object according to claim 34, characterized in that: 36. The method for detecting a buried object according to claim 34, wherein the material of the buried object is confirmed by superimposing waveforms of radio waves received by the receiving antenna at different depths. 37. A buried object detection device for detecting a buried object in the ground, comprising: a gantry supported by a support leg; an elevating device provided on the gantry for raising and lowering a wire rope; An embedded tube, which is provided below and has a telescopic tube body through which the wire rope penetrates and to which the tip of the wire rope is fixed, and an antenna provided at the tip of the tube body. Object detection device. 38. The cylinder comprises a plurality of cylinders having different diameters, a groove is provided on an outer side surface of each cylinder, and a second cylinder having a smaller diameter is provided inside the first cylinder. The guide projection provided on the inner side surface of the first tube expands and contracts by moving the second tube along a groove provided on the outer side surface of the second tube. 37. The buried object detection device according to 37.