JPH0743459A - Apparatus for detecting underground embedded material - Google Patents

Abstract

PURPOSE:To detect on the ground an underground embedded material by converting the signal, which is received with a coil-shaped antenna, into the actuating electric power, converting the information stored in an integrated element into the electromagnetic wave, transmitting the electromagnetic wave, transmitting the signal into a transponder provided in the vicinity of the embedded material as the electromagnetic wave, receiving the signal with a receiver, and displaying the signal on a display device. CONSTITUTION:A transponder 10 is constituted of a coil-shaped antenna 14, which is connected to an integrated element 16, and a cover 12 housing the element and the antenna. The transponder 10 is embedded in the vicinity of an embedded material 18. When the embedded material 18 is detected, a computer 22 is operated, and the signal is transmitted from a transceiver 20 connected to the computer into the transponder 10 as the electromagnetic wave. The transponder 10 uses the received signal as the actuating electric power. The information stored in the integrated element 16 is converted into the electromagnetic wave, and the electromagnetic wave is transmitted from the antenna 14. The signal is received with the transceiver 20. The information of the integrated element 16 is displayed on a display device through the computer 22. Thus, the embedded material can be detected without digging the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground buried object detecting apparatus for detecting underground buried objects such as water pipes and gas pipes buried underground from the ground.

[0002]

2. Description of the Related Art Conventionally, various buried objects such as gas pipes, water and sewer pipes, power lines, and communication lines buried underground are repaired,
Alternatively, when burying a new buried object near the existing buried object, it is necessary to dig up the ground again. In such excavation work, the buried object may be damaged by an excavator such as a power shovel,
It was sometimes damaged. Therefore, in the ground above the buried object, a buried object sign indicating information such as the kind, standard, and burying time of the buried object and a warning is buried together with the buried object, and the operator is alerted to the buried object. It prevented damage and breakage.
Examples of such buried object markers include, for example, JP-A-61-59.
There is one described in Japanese Patent Publication No. 084. However, since this method simply buried the buried object sign in the ground, after all, unless the ground was dug up, it was not possible to obtain information such as the kind of the buried object, the standard, and the burial time. It was very inconvenient. Therefore, various detecting means have been devised to obtain information on the buried object from the ground without digging up the ground.

For example, there are the following means. (1) Underground buried matter, for example, at a point where a water pipe seems to be buried, radiates electromagnetic waves toward the ground from an arbitrary radiation point on the ground, and water that exists within the radiation range of this electromagnetic wave Generate an induced electromotive force in the tube. Then, the presence or absence of the pipe is searched by detecting the induced magnetic field generated by the generated induced electromotive force at a point away from the radiation point.

(2) When burying an underground buried object, a marker provided with a metal foil such as aluminum on one surface of a long strip-shaped non-conductive member is buried between the buried object and the ground surface. . And
By the same method as in the above (1), the presence or absence of the buried object is searched by detecting the labeled body.

(3) Capacitors are connected to both ends of a ring-shaped conducting wire, and a resonance element (marker) that resonates at a specific frequency is buried near the buried object. Then, the same frequency as the resonance frequency of the marker is oscillated intermittently to radiate electromagnetic waves toward the ground. Then, the presence or absence of the water pipe is searched by receiving the reflected wave from the water pipe existing in the ground, and the marker absorbs the oscillation energy on the oscillation side and receives the electromagnetic wave oscillated by this energy. By doing so, the position of a specific portion of the water pipe is searched (see JP-A-60-230076).

(4) When burying a water pipe, a resonance element (marker) that resonates at a specific frequency is buried near the water pipe. Then, an electromagnetic wave having the same frequency as the resonance frequency of the marker is oscillated, and the electromagnetic wave is radiated toward the ground.
Then, the position of the water pipe is searched by detecting the point where the oscillation energy is absorbed maximally by using a detector capable of detecting that the oscillation energy is absorbed by the marker (Japanese Patent Laid-Open No. 48-27762). See the bulletin).

[0007]

However, each of the above means has the following problems.

In the means of (1) above, after confirming the existence of the water pipe, it is necessary to move the detection point away from the emission point of the electromagnetic wave in order to search the burying direction of the water pipe. The level of the detection signal on the detection point side gradually decreases as it goes. For this reason, when exploring the water pipe along its embedding direction, a detection signal of a constant level cannot be obtained continuously, so that a foreign substance having conductivity exists between the water pipe and the ground surface. In addition, it is difficult to distinguish this foreign object from the water pipe. That is, it is difficult to accurately distinguish the target object from the non-target object. Therefore, it is necessary to move the radiating point for each distance at which a detection signal of a constant level can be continuously obtained. But in this case
Exploration work requires a lot of time, and work efficiency is poor. Also,
It is difficult to confirm a T-shaped branch point, a cross-shaped branch point, or the like from the detected magnetic field. Further, it is impossible to identify whether or not the detected object is a target object.
Therefore, as a result, I had no choice but to rely on the trial moat. Also,
In recent years, pipes made of non-conductive materials such as vinyl chloride have been used more often. However, if they are made of these non-conductive materials, induced electromotive force does not occur. Can not do it.

In the above-mentioned means (2), since the marker provided with the metal foil is used, it is possible to detect even a pipe made of a non-conductive material such as vinyl chloride. However, similar to the above-mentioned means (1), when the marker is searched along the embedding direction, a detection signal of a constant level cannot be obtained continuously, and the T-shaped branch point or the cross shape is detected. It is difficult to check the branch points.

In the above means (3), since the marker having a special structure is used, whether or not the buried object is made of a conductive material or a non-conductive material is present or absent. And the position of the branch point can be confirmed. However, in order to allow a pipe made of a non-conductive material to be probed along its embedding direction, a sign must be placed along the pipe. In this case, when the pipe is searched along the embedding direction, it is necessary to shorten the arrangement interval of the markers so that a detection signal of a constant level can be continuously obtained. For this reason, a very large number of labels are required, resulting in an increase in cost.

The means of (4) above includes (3) above.
In addition to having the same drawbacks as the means of (1), even if the pipe is made of a conductive material, a large number of detection signals are continuously obtained when the pipe is searched along the embedding direction. Labeling is required. Therefore, the cost still rises. Thus, in each of the above means, when exploring the pipe along its embedding direction,
In order to accurately identify the target pipe from other pipes and foreign substances, the detection work becomes complicated and the equipment is expensive because the detection signal of a constant level is continuously obtained along this pipe. There was a problem such as becoming.

Further, a marker sheet has been devised which is composed of a spiral conductive wire which functions as a resonance circuit and capacitors connected to both ends of the conductive wire. JP-A-2-253187
JP-A-2-253187, JP-A-4-93687
See the official gazette. These oscillate an electromagnetic wave having a predetermined frequency from the ground and detect an electromagnetic wave radiated in resonance with the electromagnetic wave, that is, a secondary radio wave. This sign sheet has an excellent effect that it can be detected from the ground before trial digging, and the buried object can be identified by the resonant frequency. However, in this sign sheet, it is possible to identify the type of the buried object by properly using the tuned frequency. For example, although it is possible to distinguish between a water pipe and a gas pipe, more information can be obtained. I can't. For example, not only the type and use of the buried object, but the management company, material,
Detecting a large amount of information such as size, burial depth, burial time, etc. becomes very complicated and is not practical. Also, even if any of the above detection means is not possible, it is very effective and convenient to be able to newly write the date and time and the inspection contents when inspecting and inspecting buried objects, and then detecting this Is.

The present invention has been made to solve the above-mentioned problems, and it is possible to detect an embedded object buried in the ground without digging up the ground, and obtain a lot of information about the embedded object. Provides a device for detecting underground buried objects to which information can be added.

[0014]

SUMMARY OF THE INVENTION An underground buried object detecting apparatus according to the present invention comprises an integrated element for storing information, a coil-shaped antenna connected to the integrated element, and a cover including the integrated element and the antenna. And a signal received by the antenna as an operating power, which transmits information stored in the integrated element as an electromagnetic wave and is installed in the vicinity of a buried object buried in the ground, and a signal to the transponder. A transmitter / receiver that transmits a signal as an electromagnetic wave and receives a signal from a transponder, and controls transmission and reception of a signal from the transmitter / receiver.
And a computer for displaying the information stored in the integrated element on the attached display from the signal obtained from the transponder via the transceiver.

[0015]

In the detecting device of the present invention, a signal is transmitted as an electromagnetic wave from the transceiver to the transponder buried near the buried object, and the information stored in the transponder is transmitted again to the transceiver as operating power. Is what
It is a transceiver on the ground that detects an embedded object by a transponder in the ground. Then, the signal received by the transceiver is transmitted to the computer and the information is displayed on the display. Moreover, the integrated element built into the transponder is capable of storing a large amount of information, and this large amount of information is displayed on the display. Therefore, not only the type of the buried object but also a lot of information necessary for managing the buried object can be grasped accurately and easily without digging up the ground. Further, when the buried object is a pipe, if the buried direction is stored in the transponder, the exploration along the buried direction becomes easy. Also, if a rewritable ram type is applied to the integrated element, when the buried object is inspected or inspected after the transponder is buried, the date and time and the contents of the inspection can be newly written from the ground surface. It is possible to detect the added information at a later date.

[0016]

EXAMPLE An example of the present invention will be described below. The underground buried object detecting device of the present embodiment is particularly suitable as a detecting device for a pipe such as a water pipe, particularly as a detecting device at a branch portion or an end portion of the pipe, and is buried in the ground together with the buried object. A transponder, a transceiver that sends a signal to the transponder, and receives a signal from the transponder, and controls the transmission and reception of a signal from the transceiver, and from the signal obtained from the transponder through the transceiver, in the transponder. And a computer for displaying the information stored in the integrated device of 1. on an attached display.

The transponder 10 shown in FIG. 1 includes an integrated element 16 for storing information, a coiled antenna 14 connected to the integrated element 16, the integrated element 16 and the antenna 1.
4 and a cover 12 that contains 4 therein. As the integrated element 16, a commercially available memory device such as a read-only ROM type and a ram type capable of writing in addition to reading can be applied. The antenna 14 can be used as long as it is a conductive wire, and as shown in FIG. 1, it has one coil of a circular shape, multiple windings, or various coil shapes such as an ellipse and a quadrangle. Any thing can be used.

The cover 12 shown in FIG. 1 is formed by stacking two synthetic resin films, and the integrated element 16 and the antenna 14 are sandwiched inside and sealed. Since the cover 12 is buried in the ground, the cover 12 has only to have a strength capable of withstanding the weight of earth and sand, and the cover 12 is not limited to the film-like one described above, but may be, for example, a box-like one. it can. However, a material that blocks electromagnetic waves is not preferable because it significantly reduces the sensitivity. Further, in consideration of measures such as ground subsidence and vibration, it is more preferable to have flexibility. The synthetic resin applied to the cover 12 includes
Costs include polyolefins, especially polyethylene and polypropylene, but these have insufficient gas barrier properties against oxygen gas, hydrogen sulfide gas and the like that may exist in the ground, and are inferior in durability. Then, as a synthetic resin preferable for application of the cover 12, polyethylene terephthalate, polyamide, ethylene-vinyl alcohol copolymer resin (EVOH: saponified ethylene-vinyl acetate copolymer), vinylidene chloride resin (PVDC) and the like can be mentioned. You can Further, instead of using such a synthetic resin alone, a plurality of types can be used. Furthermore, since the heat-bonding method is often used to form the cover 12, it is preferable to use polyethylene in combination on the bonding surface.

As shown in FIG. 2, the transponder 10 is buried near the buried object 18 buried in the ground.
When detecting the buried object 18, the computer 2
2 is operated to transmit a signal as an electromagnetic wave from the transmitter / receiver 20 connected thereto to the transponder 10. The transponder 10 uses the signal transmitted from the transmitter / receiver 20 as operating power, and transmits the information stored in the integrated element 16 incorporated therein as electromagnetic waves from the antenna 14. The transmitted signal is received by the transceiver 20 and transmitted to the computer 22 connected thereto. As for a signal used for transmission, a low frequency signal tends to reduce noise, which is preferable, and a signal of about 134 kHz is convenient. A signal obtained from the transponder 10 via the transceiver 20 is transmitted to the computer 22, and the information stored in the integrated element 16 is displayed on a display attached to the computer. Also, the integrated device 16 of the transponder 10
If the ram type is a ram type, new information is input to the computer 22, and this is transmitted from the transceiver 20 to the transponder 10 as a signal of an electromagnetic wave, so that the integrated device 16
Information can be newly stored or rewritten. It is needless to say that the transceiver 20 and the computer 22 may be connected separately or combined together.

As the transponder and the transceiver, a well-known commercially available transponder and a transceiver to which the transceiver is applied can be applied. However, since the transponder is buried in the ground, the communication performance and the durability of the transponder are not suitable as they are. However, it must not be usable, and it must be one that can be adapted for underground burial by forming a special antenna or cover as described above.

According to this embodiment, the integrated device can store a great deal of information, so that a great deal of information can be obtained from the transponder during the detection operation. For example, if the buried object is a pipe, the name of the management company of the pipe, the purpose of the buried object (water supply, sewer, gas pipe, communication cable, power cable, etc.), material (steel pipe, cast iron pipe, polyethylene pipe, fume pipe, etc.) ), Size, burial depth, burial time, control number, construction company name, auxiliary code, etc. can be stored and read. It is possible to embed the transponder together with the embedded object after storing this information in the integrated element before embedding, but if the integrated element is a ram type, enter the inspection and inspection contents after embedding into the computer. It is also possible to transmit from the transceiver and add to the integrated device.

Since the buried object detecting apparatus of this embodiment utilizes signal transmission by electromagnetic waves, the buried object can be detected without digging up the ground, and the kind, standard, and buried object can be detected. You can get a lot of information such as the time. Therefore, the identification of the buried object is easy and accurate. Further, since it is sufficient to input such information as to whether or not the buried portion is a T-shaped branch point or a cross-shaped branch point, it is easy to identify and confirm. Further, the conventional underground buried object detection device, since it was mainly judged from the shake of the pointer of the meter, such as experience and proficiency was necessary, but if the detection device of this embodiment Since the information transmitted from the transponder can be displayed as characters, tables or diagrams on the computer display,
Information can be grasped very clearly and easily. Moreover, the displayed information can be stored in the computer as it is or can be printed out, which can significantly reduce the labor of the worker on the site. Also,
Since the material of the buried object is not limited, the buried object may be made of a conductive material or a non-conductive material, which is highly versatile. Furthermore, in the detection device of the present embodiment, the power source of the transponder uses the signal transmitted from the transmitter / receiver as the operating power, so it does not require a battery or the like and has a long life. Therefore, there is little need for maintenance,
It can be buried in the ground for a long time with peace of mind.

[0023]

According to the underground buried object detecting apparatus of the present invention, a signal is transmitted as an electromagnetic wave from a transceiver to a transponder buried near an buried object, and the transponder stores the electromagnetic wave as operating power. The information is transmitted again to the transceiver, and the information stored in the transponder is displayed on the display by the computer connected to the transceiver. Moreover, the integrated elements built into the transponder can store a lot of information, which is displayed on the display. Therefore, not only the type of the buried object but also a lot of information necessary for managing the buried object can be grasped accurately and easily without digging up the ground. Moreover, since the displayed information can be stored in the computer as it is or can be printed out, the labor of the worker on the site can be remarkably reduced. Since the material of the buried object is not limited, the buried object may be made of a conductive material or a non-conductive material, which is highly versatile. Furthermore, in the detection device of the present embodiment, since the power source of the transponder depends on the signal transmitted from the transceiver, the transponder does not need a battery or the like and has a long life. Therefore, there is little need for maintenance,
It can be buried in the ground for a long time with peace of mind. In addition, if a rewritable ram type is applied to the integrated element, new information can be added from the ground surface after the transponder is buried, and the added information can be detected at a later date. Becomes Therefore, it is very effective and convenient.

[Brief description of drawings]

FIG. 1 is a plan view showing a transponder of the present invention.

FIG. 2 is a schematic configuration diagram of a detection device of the present invention.

[Explanation of symbols]

 10 Transponder 12 Cover 14 Antenna 16 Integrated Element 18 Embedded Object 20 Transceiver 22 Computer

Claims (1)

[Claims] 1. An integrated element for storing information, a coil-shaped antenna connected to the integrated element, and a cover enclosing the integrated element and the antenna, wherein a signal received by the antenna is integrated as operating power. The information stored in the element is transmitted as an electromagnetic wave, the transponder is installed in the vicinity of the buried object buried in the ground, and the transceiver that transmits a signal to the transponder as an electromagnetic wave and receives the signal from the transponder. And a computer for controlling the transmission and reception of signals of the transceiver and displaying the information stored in the integrated element from the signal obtained from the transponder via the transceiver on an attached display. A device for detecting an underground buried object, which is characterized in that: