JPH053552B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a buried object detection device, and more particularly to a buried object detection device suitable for detecting buried objects such as pipes buried underground from the ground.

[Background of the invention]

In general, buried objects such as pipes buried underground must be periodically detected for their position, size, etc. to detect any abnormality, and to be replaced if any abnormality is found. However, since piping etc. are buried underground, and there are multiple buried underground pipes, it is not easy to detect them.
A buried object detection device as shown in FIG. 2 is used to detect buried objects.

The buried object detection device shown in FIG. 1 includes a sensor 1 that transmits a magnetic field underground 8 and receives a magnetic field 9 induced by the buried object, and a transceiver 2 that transmits and receives a high-frequency magnetic field to and from the sensor 1. This transceiver 2
It is generally composed of a data processing device 3 that processes signals from the data processing device 3, and an output device 4 that outputs the presence of a buried object based on the processing result of the data processing device 3. When detecting buried pipes 5, 6, and 7 with different diameters buried underground 8,
The transceiver 2 transmits a high frequency magnetic field from the sensor 1 to the underground 8, and the magnetic field 9 induced in the buried pipes 5, 6, 7 is received again by the sensor 1 and detected by the transceiver 2. Signal data processing device 3
The presence of the buried pipes 5, 6, and 7 is outputted to the output device 4 through arithmetic processing.

On the other hand, the buried object detection device shown in Fig.
An antenna 12 that is a sensor that transmits radio waves 10 to the ground and receives reflected waves 11 reflected by buried objects, a transceiver 13 that transmits and receives radio waves to and from this antenna 12, and arithmetic processing of signals from the transceiver 13. The image output device 15 generally includes a data processing device 14 that performs the processing, and an image output device 15 that displays the position and size of the buried object based on the processing results of the data processing device 14. When detecting a buried pipe 16 buried underground 8, the transmitter/receiver 13 transmits a radio wave 10 from the antenna 12, and the reflected wave 11 reflected by the buried pipe 16 is sent back to the antenna 12.
2, the transmitter/receiver 13 detects the signal, and the signal is passed through the data processing device 14 to the image output device 15 to display the position and size of the buried pipe 16.

However, the buried object detection devices shown in FIGS. 1 and 2 described above have the following drawbacks. In other words, in the example of Fig. 1, there is no problem if the buried pipes 5, 6, and 7 are separated to some extent, but if the buried pipes 5, 6, and 7 are close to each other (for example, 40 cm or less), there is no problem. In this case, the magnetic fields induced in each of the buried pipes 5, 6, and 7 interfere with each other, making it difficult to distinguish between the individual buried pipes. In addition, in the example shown in FIG. 2, if a water mass 17 etc. is present near the buried pipe 16 in the underground 8, there will be a reflected wave from this water mass 17, and the water mass 17 will also be transmitted to the image output device along with the buried pipe 16. 15, and it becomes unclear where the actual buried pipe 16 is located.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and its purpose is to detect buried objects with high precision without any hindrance even when a plurality of buried objects are located close to each other and there is a body of water, etc. An object of the present invention is to provide a buried object detection device that can detect buried objects.

[Summary of the invention]

According to the present invention, a sensor for detecting a buried object buried underground from the ground is composed of at least two types of sensors with different transmission/reception signal formats, and one of the sensors detects the approximate position of the buried object that can be identified by the sensor. The other one is to separate the signal from the buried object and the disturbance signal, and detect at least the detailed position and size of the buried object from the signal of the buried object, and the sensor detects the buried object. The transmitter/receiver that transmits and receives signals for detecting objects transmits and receives signals corresponding to the signal formats of the sensors that have different transmission/reception signal formats. The output device that outputs and displays the size and position of the object includes a device that outputs the approximate position of the buried object according to the signals from each sensor, and an image output device that outputs and displays the detailed position and size of the buried object. The device is configured to achieve the intended purpose by further comprising a switch for switching to each transmitter/receiver corresponding to the signal format of each sensor having a different transmitting/receiving signal format. be.

[Embodiments of the invention]

The present invention will be described below based on embodiments shown in the drawings.

FIG. 3 shows an embodiment of the buried object detection device of the present invention.

As shown in the figure, the buried object detection device of this embodiment includes a magnetic sensor 22 and a radar antenna 23 mounted on an automatic traveling device 20 that is operated by an operating device 21 and travels automatically. The magnetic sensor 22 is
A transmitter/receiver 24 that transmits and receives a high-frequency magnetic field transmits a high-frequency magnetic field underground 8, thereby transmitting a high-frequency magnetic field to the underground pipe 2.
It receives the magnetic field 27 induced in 5, 26,
This is detected by the transmitter/receiver 24, and the approximate horizontal position of the buried pipes 25, 26 is outputted to the output device 28 based on the signal. On the other hand, radar antenna 23
is transmitted underground via a transmitter/receiver 29 that transmits and receives radio waves.
The radio waves 30 are transmitted to the radar antenna 2, and the reflected waves are reflected by the buried pipes 25 and 26.
3, this is detected by the transmitter/receiver 29, and based on the signal, the detailed position, depth, size, etc. of the buried pipes 25, 26 are output and displayed on the image output device 31. Switching of the output display by the magnetic sensor 22 and the radar antenna 23 is performed by a switch 32.

Next, the operation of the buried detection device in this embodiment will be explained. Buried pipes 25 and 26 buried underground 8
To detect this, first, the automatic traveling device 20 equipped with the magnetic sensor 22 and the radar antenna 23 is operated by the operating device 21 and moved to the vicinity of the expected buried position of the buried pipes 25 and 26. Then, the switch 32 switches to a mode that can be detected by the magnetic sensor 22, and the transmitter/receiver 24 and output device 28 output, and the approximately horizontal positions of the buried pipes 25, 26 are detected. Thereafter, the switching device 32 switches to the mode of the radar antenna 23, the radar antenna 23 and the transmitter/receiver 29 are used to detect the buried pipes 25, 26, and the detailed positions of the buried pipes 25, 26 are displayed on the image output device 31. , output and display depth, size, etc.

By using the buried object detection device of this embodiment as described above, the existence of the buried pipes 25 and 26 can be sufficiently detected by the magnetic sensor 22, and even if there is a body of water, it will not be induced in the buried pipes 25 and 26. Since the device receives the magnetic field generated by the sensor, there is no possibility of making incorrect determinations. Furthermore, even if the radar antenna 23 mixes reflected signals from the buried pipes 25 and 26 with disturbance signals such as similar reflected signals from water bodies, etc., the buried pipe 2
Since it is determined in advance that there are 5 and 26, it is easy to separate only the tube signal, and
Since the radar antenna 23 can break down the reflected waves reflected by the buried pipes 25 and 26 into small pieces, it is possible to easily determine the position of each buried pipe even if a plurality of buried pipes are located adjacent to each other. Can be detected. Further, in this embodiment, since the magnetic sensor 22 and the radar antenna 23 are mounted on the autonomous vehicle 20 and moved, there is an effect that the detection efficiency (speed) is greatly improved.

In the above-mentioned embodiment, an example using a magnetic sensor and a radar antenna has been described, but it is also possible to detect a buried pipe in combination with a sound wave method. For example, detection can be performed in the same way by combining a magnetic method and a sonic method, or a combination of a radar method and a sonic method. When using the sonic method,
Needless to say, it is equipped with a transmitter/receiver and an output device suitable for the acoustic wave method. Furthermore, if the magnetic method, the radar method, and the sonic method are added, and the sonic method is used as a backup for the radar method, the detectability (accuracy) will be further improved.

〔Effect of the invention〕

According to the buried object detection device of the present invention described above, the sensor that detects the buried object buried underground from the ground has at least two different transmitting and receiving signal formats.
Consisting of more than one type of sensor, one detects the approximate location of the buried object that can be identified by the sensor, and the other separates the signal from the buried object and the disturbance signal, and separates the signal from the buried object from the signal. A transmitter/receiver that detects at least the detailed position and size of the buried object, and that transmits and receives a signal for detecting the buried object to the sensor, is configured to transmit and receive a signal for each sensor having a different signal format. The output device outputs and displays the size and position of the buried object based on the signals received by the transceiver, and the output device outputs and displays the size and position of the buried object in response to the signals from each sensor. It consists of a device that outputs the position, and an image output device that outputs and displays the detailed position and size of the buried object, and further switches to the respective transmitter/receiver corresponding to the signal format of each sensor with different transmission/reception signal formats. Since this type of buried object detection device is equipped with a switching device that performs It is very effective.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional buried object detection device using a magnetic method, FIG. 2 is a schematic diagram of a conventional buried object detection device using a radar method, and FIG. 3 is an embodiment of the buried object detection device of the present invention. FIG. 8...Underground, 20...Automatic traveling device, 21...
Operating device, 22... Magnetic sensor, 23... Radar antenna, 24, 29... Transmitting/receiving device, 2
5, 26... Buried pipe, 27... Magnetic field, 28... Output device, 30... Radio wave, 31... Image output device,
32...Switcher.

Claims (1)

[Claims] 1. A sensor that detects a buried object buried underground from the ground, a transceiver that transmits and receives a signal for detecting the buried object with the sensor, and a sensor that detects the buried object based on the signal received by the transmitter/receiver. In the buried object detection device equipped with an output device that outputs and displays the size and position of The other one is to separate the signal from the buried object and the disturbance signal, and detect at least the detailed position and size of the buried object from the signal of the buried object. The transmitter/receiver transmits and receives signals in accordance with the signal formats of the sensors having different transmission/reception signal formats,
The output device includes a device that outputs the approximate position of the buried object according to signals from each of the sensors, and an image output device that outputs and displays at least the detailed position and size of the buried object; A buried object detection device comprising a switch for switching to a respective transmitter/receiver corresponding to the signal format of each sensor having a different transmission/reception signal format.