JPH11344574A - Charging type underground crustal activity observation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the working time to embed a measurement part in a bottom of a boring hole by providing a charging type underground crustal activity observation device capable of detaching a compound cable, to lower a boring equipment to the hole bottom in renewing the measurement part of the device, to recover the measurement part of the embedded device for recycling the hole bottom. SOLUTION: A measurement part 1 of a charging type underground crustal activity observation device is embedded in a boring hole 3, and a compound cable 100 having an electrode 70 to supply the power to a tip part of the measurement part 1 from a recording part 2 installed on a mouth of the boring hole 3 and a data exchanging means to transmit/receive the data and the control signal to/from the measurement part 1 is lowered into the boring hole 3. The tip of the compound cable 100 is joined with the measurement part inside a container provided on an upper part of the measurement part, and covered with an electrically insulating liquid to charge a power source of the measurement part 1 and to transmit/receive the control signal while protecting a joined part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable underground type crustal activity observation device used in a borehole, and a device for observing a change in a physical phenomenon accompanying the crustal activity.

[Prior art]

2. Description of the Related Art A composite cable composed of a signal line and a power supply line is connected to a seismometer or a strain gauge buried in a borehole, and power is supplied to the buried instrument via the composite cable. Is supplied or an electrical signal from the buried instrument is input to the recorder.

[0003]

When a seismometer or a strain gauge is buried in a borehole, a compound cable connected to the instrument hinders the burying operation. When replacing these instruments buried at the bottom of the hole, it is necessary to carry out boring and collect these instruments. However, the composite cable connected to the instrument is an obstacle, and the equipment for boring must be moved to the bottom of the hole. You cannot drop. Therefore, in order to update the seismometers and strain gauges, it is necessary to remove the cable from the borehole and to drill the borehole separately.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a rechargeable underground type crustal activity observation device having a detachable composite cable, in which a measurement portion of the observation device is easily embedded in a borehole. And reduce the work time associated with burial. When updating the measurement unit,
The boring equipment is lowered to the bottom of the boring hole with the composite cable unwound, and the buried measuring unit is collected, and the bottom of the hole is reused to reduce boring drilling costs.

[0005]

According to the first aspect of the present invention, there is provided a rechargeable underground type crustal activity observation device for observing a change in a physical phenomenon accompanying crustal activity, comprising: a measuring unit installed in a borehole; It consists of a recording unit installed at the hole,
Inside the sealed container that constitutes the measurement unit, means for converting changes in physical phenomena due to crustal activity into digital data,
Means for storing the data, means for storing electric energy for power supply, means for receiving power for charging, and data exchange means for transmitting and receiving data and control signals between a recording unit installed in a hole. Is provided. The recording unit installed at the hole has a means for supplying power for charging to the measuring unit at the end of a composite cable that can be unwound, and a data exchange for transmitting and receiving data and control signals to and from the measuring unit. Provide means.

[0006] The leading end of the composite cable that can be unwound is lowered from the recording unit installed at the hole into the boring hole, and the leading end of the composite cable is measured in the insulating liquid provided at the measuring unit installed in the hole. It connects to the unit and charges the secondary battery of the measurement unit via the power supply electrode, and sends and receives data and control signals between the measurement unit and the recording unit via the signal electrode. In addition, the secondary battery for the power supply of the measuring unit is charged by non-contact means, and data and control signals are transmitted and received between the measuring unit and the recording unit by non-contact means.

Normally, the measuring unit and the recording unit are operated integrally with a commercial power supply. However, if the recording unit has a means for storing electric energy for the power supply and a means for storing data, it is necessary to charge the battery periodically. The change in physical phenomena associated with crustal activity can be observed without connecting a power line to the recording unit.

[0008]

The rechargeable underground crustal activity observation device according to the present invention can separate the buried measuring unit and recording unit. If the composite cable or wire is unwound from the boring hole, the work of burying the measuring part becomes simple and the cost required for burying can be reduced.

[0009] Even when the measuring unit embedded in the bottom of the hole is to be renewed, the boring equipment can be lowered to the bottom of the hole by winding up the composite cable or wire from the boring hole. Drilling can be performed in a buried place, and the buried measuring part can be collected. For this reason, the bottom of the borehole can be reused, and the cost of newly drilling the borehole can be saved.

[0010] When the rechargeable underground crustal activity monitoring device according to the present invention is buried, if the measuring unit and the recording unit are periodically joined, the secondary battery of the measuring unit can be charged via the composite cable, and the measurement can be performed. The data stored in the unit can be transmitted to the recording unit installed in the hole. For this reason, it is possible to observe changes in physical phenomena due to crustal activity at the required time, similar to the conventional crustal activity monitoring device to which the composite cable is connected.

On the other hand, transmission and reception of data and control signals between the measuring unit and the recording unit are performed by using electromagnetic waves, visible rays, ultraviolet rays, infrared rays,
If it is done by non-contact means via ultrasonic waves, the measurement part buried in the borehole is less likely to break down due to lightning strike because the cable for transmitting and receiving data and control signals has a non-contact part.
In this case, the following effects are obtained by transmitting and receiving by these means in the insulating liquid provided in the measuring unit. That is, the electronic circuits and electrodes used for these means are covered with the insulating liquid and do not come into contact with the water in the borehole. For this reason, the electronic circuit for transmitting and receiving data and control signals is less likely to fail and operates stably for a long time.

According to the rechargeable underground type crustal activity observation device of the present invention, a rechargeable secondary battery is built-in.
After charging the battery for power supply, the observation of crustal activity can be continued even if the composite cable is unwound from the borehole. Therefore, the drilling hole in which the observation device according to the present invention is buried can be used for multipurpose use which was difficult in the past.

That is, if the composite cable or wire is unwound, the composite cable or wire is not obstructed, and the temperature of groundwater and the quality of water can be measured inside the same borehole. Then, after the work such as measurement of groundwater temperature and water quality is completed, the composite cable and wire are lowered to continue observation of crustal activity. If the observation data during the work is required, the data saved in the memory of the measurement unit is transmitted to the recording unit of the hole by sending a control signal.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a use of a rechargeable underground type crustal activity observation device according to an embodiment, FIG. 2 is a configuration diagram of a measurement unit 1 of the device, and FIG. 3 is a use of a recording unit 2 of the device. Actual figures are shown.

As shown in FIG. 2, the measuring section 1 of this embodiment includes a secondary battery 10 as a power supply, an electrode 20 constituting a means for receiving the power, and an analog signal corresponding to a change in a physical phenomenon. An electrode 50 constituting an analog / digital converter 30 for converting data and data exchange means 40 for transmitting and receiving data and control signals;
Means 60 is provided for covering with an insulating liquid so as to prevent 0 from contacting the water in the borehole.

The recording section 2 of this embodiment has a composite cable 100 that can be wound up. As shown in FIG.
0, an electrode 90 constituting a data exchange means 80 for transmitting and receiving data and control signals to and from the measuring unit 1 is provided at the tip,
Use by dropping into the boring hole.

A method for observing a change in a physical phenomenon accompanying crustal activity by burying the rechargeable underground type crustal activity monitoring device configured as described above in a borehole will be described with reference to FIG. As shown in FIG. 1, the measuring unit 1 having the configuration of FIG.
Is buried in the boring hole 3, the composite cable 100 is lowered from the recording unit 2 installed in the hole to the boring hole, and joined to the measuring unit 1. In the embodiment of FIG.
As a means 60 for covering with an insulating liquid, there is a container filled with a liquid having a specific gravity greater than that of water, and an electrode 20 for receiving a power supply and an electrode 50 for a signal used for transmitting and receiving data and control signals are provided therein. is there. Then, these electrodes are joined to the power supply electrode 70 and the signal electrode 90 having the configuration shown in FIG.

According to the embodiment shown in FIGS. 1, 2 and 3, the cable 10 dropped from the recording unit 2 into the borehole
In the case where the leading end of the power supply unit 0 is joined to the measuring unit 1, the power supply receiving electrode 20 and the power supply electrode 70, and the electrodes 50 and 90 constituting the data exchange means are covered with the insulating liquid 6
Joined inside 0. With this configuration, water having a specific gravity smaller than that of the insulating liquid is applied to the electrodes 20, 50, 70, and 90.
The power can be supplied to the measuring unit 1 without penetrating into the portion covered with the insulating liquid that comes into contact. In addition, data and control signals can be transmitted and received between the measurement unit 1 and the recording unit 2 under the control of a microcomputer or a scheduler (not shown), and observation of crustal activity can be continued. According to this embodiment, the composite cable 1
If the work is performed with the 00 rolled up, the embedding of the measuring unit 1 is easy, and even when updating 1, the boring equipment can be lowered to the bottom of the boring hole.
The bottom of the hole can be reused.

FIG. 4 is a configuration diagram of a rechargeable underground type crustal activity observation device according to another embodiment. In this example, a coil 110 is provided inside the measuring unit 1 as data exchange means. Then, a container filled with an insulating liquid is provided above the measuring unit 1, and an electrode 20 for receiving power is provided inside the container. In addition, the composite cable 10 dropped from the recording section at the hole.
An electrode 70 for supplying power to the measuring unit 1 and a coil 120 as a data exchange means 80 are provided at the tip of 0.

According to the embodiment of FIG. 4, an electrode 20 constituting a means for receiving power and an electrode constituting a means for supplying power are provided above the measuring section 1 by means of a cover covered with an insulating liquid. 70, and the secondary battery 10 for the power source of the measuring unit 1
Charge. On the other hand, the data from the analog / digital converter 30 that converts an analog signal corresponding to a change in a physical phenomenon into digital data via the coil 110 provided in the measuring unit 1 or the coil 120 provided at the end of the composite cable 100 is transmitted to an electromagnetic wave. Is transmitted to the recording unit 2 under the control of a microcomputer or a scheduler (not shown). In this example,
Although the composite cable 100 is composed of a power supply line and a signal line, since the number of electrodes for joining the measuring unit 1 and the recording unit 2 is small,
The structure of the joining part can be simplified. In the case of this embodiment as well, when the composite cable 100 is unwound as in the above-described embodiment, the work such as burying is simplified.

FIG. 5 is a block diagram of a rechargeable underground type crustal activity observation device according to another embodiment. In this embodiment,
As in the embodiment of FIG. 4, a container filled with an insulating liquid is provided above the measuring unit 1 as means 60 for covering with an insulating liquid, and an electrode 20 for receiving power is provided inside the container. Further, the coaxial cable 130 is dropped from the recording section at the hole, and an electrode 70 for supplying power to the measuring section 1 is provided at the end. Then, the electrode 20 constituting the means for receiving power provided in the measuring section 1 and the electrode 70 constituting the means for supplying power are joined inside the means 60 for covering the electrode 70 with an insulating liquid, thereby forming the secondary battery. Charge 10. In this example,
The same coaxial cable 130 is also used for data exchange means. More specifically, two coils, a coil 110 provided in the measuring section 1 and a coil 140 joined to the electrode 20 constituting a means for receiving power through a capacitor, are subjected to antenna coupling, and analog / digital signals are generated by electromagnetic waves. Data and control signals are transmitted and received by the converter 30.

In the case of this embodiment, the cable corresponding to the composite cable connected to the recording section 2 is constituted only by the coaxial cable 130 which also serves as a power supply line and a signal line, and the cable can be made thin. If the cable becomes thinner, it becomes easier to wind up the cable, and the burial depth of the measuring unit 1 can be increased.

FIG. 6 is a block diagram of a rechargeable underground type crustal activity observation device according to another embodiment. In this embodiment,
Ultrasonic waves are used as a means for transmitting and receiving data and control signals. Instead of the coil 110 used in the embodiment of FIG.
0 is provided. A coil 120 is also attached to the end of the composite cable 100 which is lowered from the recording unit 2 at the hole to the boring hole.
Instead of this, a data exchange means 160 using ultrasonic waves is provided. Then, transmission and reception of data and control signals are performed by ultrasonic waves through means 60 for covering with an insulating liquid. On the other hand, if the insulating liquid is transparent, the means for transmitting and receiving data may be changed to visible rays, ultraviolet rays, infrared rays, etc. In the case of this embodiment, as in the embodiment of FIG. 4, the electrode 20 constituting the means for supplying power and the electrode 7 constituting the means for charging the power supply
0, a secondary battery 10 and an analog / digital converter 30.

FIG. 7 is another example of a usage pattern of the rechargeable underground crustal activity observation device. In this embodiment, a strainer 5 is provided in an aquifer 4 above a borehole 3 in which a measuring unit 1 is buried, and water temperature and water quality are measured. Water temperature and water quality are measured near the strainer 5 while the composite cable 100 is unwound, and after the measurement of water temperature and water quality is completed, the composite cable 100 is lowered into a borehole to continuously monitor changes in physical phenomena associated with crustal activity. Observe.

In the embodiment using the rechargeable underground type crustal activity observation apparatus according to the present invention described above, the recording unit is located at the hole of the boring hole. If the recording unit is equipped with a means for storing electrical energy, the effect is the same even if the recording unit is installed inside the borehole. In this case, if necessary, pull up the recording unit to retrieve the data stored inside or charge the secondary battery for power supply. After that, the recording part is re-installed inside the borehole and changes in physical phenomena due to crustal activity are observed.

The rechargeable underground crustal activity observation device according to the present invention can also be used in a borehole drilled in the sea floor. If the recording unit has been waterproofed, the recording unit can be installed on the seabed. In this case, it is advisable to cover the entire recording unit with an insulating liquid. It is also convenient to use a rechargeable secondary battery for the power supply of the recording unit.

In the embodiment of the present invention, the means for using a rechargeable secondary battery is used as the power source of the rechargeable underground type crustal activity observation apparatus, but any means for storing electric energy for the power source may be used. The problem of the present invention can be solved by other means. For example, there is a method of creating a power supply by combining a super capacitor and a voltage regulator.

In the embodiment of the present invention, the insulating liquid used in the rechargeable underground type crustal activity monitoring apparatus is an example of a liquid having a specific gravity larger than that of water, but the measuring unit 1 and the composite cable 100 are joined. By changing the shape of the container that makes up the part, a liquid with a specific gravity smaller than water can be used.

In the embodiment of the present invention, an example in which the secondary battery of the measuring section is charged via the electrode has been described. However, the secondary battery can be charged in a non-contact manner by using an electromagnetic wave.

[Brief description of the drawings]

FIG. 1 is a diagram showing the use of a rechargeable underground crustal activity observation device according to one embodiment.

FIG. 2 is a configuration diagram of an embedded measuring unit.

FIG. 3 is a diagram showing one use of a recording unit of a rechargeable underground type crustal activity observation device.

Fig. 4 is a block diagram of the measuring unit and recording unit of the rechargeable underground crustal activity monitoring device.

FIG. 5 is another configuration diagram of the measurement unit and the recording unit of the rechargeable underground crustal activity observation device.

FIG. 6 is another configuration diagram of the measurement unit and the recording unit of the rechargeable underground crustal activity observation device.

FIG. 7 is a diagram showing the actual use of a rechargeable underground crustal activity observation device according to another embodiment.

[Explanation of symbols]

 Reference Signs List 1 Measurement section of rechargeable underground type crustal activity observation device 2 Record section of rechargeable underground type crustal activity observation device 3 Boring hole 4 Aquifer 5 Strainer 10 Secondary battery 20 Electrode 30 Analog / digital converter 40 Data exchange Means 50 Electrodes 60 Means for covering with insulating liquid 70 Electrodes 80 Data exchange means 90 Electrodes 100 Composite cable 110 Coil 120 Coil 130 Coaxial cable 140 Coil 150 Ultrasonic data exchange means 160 Ultrasonic data exchange means

Claims (3)

[Claims] 1. A rechargeable underground crustal activity observation device comprising a measurement unit installed in a borehole drilled in the ground and a recording unit installed in the hole of the borehole, wherein the measurement unit is In a closed container, means for converting the change of physical phenomena due to crustal activity into digital data, means for storing the data, means for storing electric energy for power supply, and receiving power for charging Data exchange means for transmitting and receiving data and control signals between the recording means and the recording unit installed at the hole. The recording unit has a composite cable that can be wound up. And a data exchange unit for transmitting and receiving data and control signals to and from the measurement unit. The measurement unit and the recording unit function as a single unit under the control of a microcomputer or scheduler. A rechargeable underground type crustal activity observation device for observing changes in physical phenomena due to crustal activity, characterized in that the measuring unit and the recording unit can be separated as necessary. 2. A means for receiving and supplying a charging power source according to claim 1, and a data exchange means for transmitting and receiving data and control signals have electrodes, and these means and electrodes are provided with water in a borehole. The rechargeable underground type crustal activity observation device according to claim 1, further comprising means for covering with an insulating liquid so as not to contact the surface. 3. The recording unit has means for storing electric energy for power supply and means for storing data transmitted from the measuring unit, and continues observation of crustal activity without connecting a power line to the recording unit. The rechargeable underground type crustal activity monitoring device according to claim 1 or 2, wherein the device is capable of observing crustal activity.