JP2005017084A - Measuring instrument for geological structure prospecting and geological structure prospecting system thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To resolve a problem that individual setting of vibration picks-up and electrodes is required, when the internal structure analysis of a structure is planned by using both the elastic wave prospect and the electric prospecting which require much labor in collecting measurement data. <P>SOLUTION: The pickup, constituting a measuring instrument for geological structure prospect, comprises a sensor unit 11 for detecting the elastic waves which are placed in a measuring ground, an anchor electrode 15 to be the electrode in the electric prospecting, and a stage 14 provided in between the sensor unit 11 and the anchor electrode 15 for connecting them. The sensor unit 11 is covered with an insulation cover 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elastic wave exploration and electrical exploration measuring instrument for exploring the internal structure of a structure represented by a geological structure, and a geological structure exploration system using the same, and more particularly to an elastic structure. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geological structure exploration measuring instrument that can be used both as a vibration pickup as an elastic wave measuring instrument during wave exploration and an electrode used during electric exploration, and a geological structure exploration system using the same.
[0002]
[Prior art]
Conventionally, elastic wave exploration and electrical exploration have been performed as a method for exploring the internal structure of structures represented by geological structures. In the elastic wave exploration, an artificial seismic wave is generated in the exploration target region, and the structural exploration is performed by measuring the elastic wave propagated at each measurement point. In electrical exploration, structural exploration is performed by passing a current in the exploration target region and measuring the potential at each measurement point.
[0003]
When performing elastic wave exploration, vibration pickups equipped with sensors for measuring elastic waves at each measurement point are installed at each measurement point, and artificial seismic waves are applied to the structure to be explored, Record elastic wave data measured by each vibration pickup using an elastic wave survey recorder. Also, when conducting an electric wave exploration, an electrode is installed at each measurement point to measure the potential at each measurement point, a current is passed through the structure to be explored, and the potential between the reference point and each electrode is measured. Measure and record data using an electrical exploration recorder (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
JP 2001-337175 A (paragraph number 0916, FIG. 4, FIG. 5)
[0005]
[Problems to be solved by the invention]
In recent years, in order to improve the accuracy of exploration of structures, particularly underground structures, elastic wave exploration and electrical exploration may be used in combination. In this case, a vibration pickup is installed at each measurement point for elastic wave exploration, and an elastic wave exploration is performed. Separately, an electrode is installed at each measurement point for electric exploration. Therefore, when trying to analyze the internal structure of a structure using both elastic wave exploration and electrical exploration, the installation of the vibration pickup and the cable for the vibration pickup and the installation of the electrode and the cable for the electrode must be performed separately. The problem arises that much effort is required to collect the measurement data.
[0006]
The present invention has been made in view of the above problems, and in particular, when using both an elastic wave exploration and an electric exploration, a measurement instrument for geological structure exploration that can easily record measurement data, and the same are used. The purpose is to provide a geological exploration system.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above-described problems. In the measurement instrument for geological structure exploration of the present invention, a sensor unit that is covered with an insulating material and detects elastic waves, and the sensor unit is a measurement point. An anchor and electrode for use as an electrode in electrical exploration, and provided between the sensor unit and the anchor and electrode, at least in contact with the anchor and electrode, and the sensor unit A pedestal for connecting the anchor and electrode.
[0008]
This enables measurement equipment for geological exploration to be shared during elastic wave exploration and electrical exploration, and there is no need to change the instrument at the measurement point during elastic wave exploration and electric exploration. It is also possible to easily collect measurement data for electrical exploration. Even when elastic wave exploration and electric exploration are not used together, it is possible to use instruments installed at measurement points in common, and the number of instruments to be managed can be reduced.
[0009]
The geological structure exploration measuring instrument is provided between the sensor unit and the anchor / electrode, and the one or more members including the pedestal are provided between the sensor unit and the anchor / electrode. In addition to being insulated, it is selected so that the influence of attenuation of the elastic wave measured by the sensor unit is small.
[0010]
As a result, the sensor unit can be insulated from the anchor / electrode, and vibrations can be transmitted from the anchor / electrode to the sensor unit during elastic wave exploration, and high-frequency elastic waves required by the sensor unit can also be detected. It is possible to record data for high-accuracy elastic wave exploration.
[0011]
In the geological structure exploration measurement instrument, the pedestal uses a ceramic material.
[0012]
Since the ceramic material is an insulator and has a high elastic coefficient, it can insulate between the sensor unit and the anchor / electrode and reduce the influence of attenuation of the elastic wave measured by the sensor unit.
[0013]
In the geological structure exploration measurement instrument, the anchor and the electrode and the lead wire terminal of the sensor unit are provided on the base through a gap between the sensor unit and an insulating material covering the sensor unit. A hole for connecting with a connection line is provided.
[0014]
Thereby, it is possible to provide a mechanism for sharing the lead wire of the sensor unit in the elastic wave exploration and the lead wire of the electrode (anchor / electrode) in the electric exploration.
[0015]
Further, as another configuration in the above-described geological structure exploration measuring instrument, the pedestal is a metal material, and includes a protrusion that protrudes into a gap between the sensor unit and an insulating material covering the sensor unit, Between the base and the sensor unit, an insulating material that is less affected by the attenuation of elastic waves measured by the sensor unit is further provided.
[0016]
As a result, the sensor unit can be insulated from the anchor / electrode, and vibrations can be transmitted from the anchor / electrode to the sensor unit during elastic wave exploration, and high-frequency elastic waves required by the sensor unit can also be detected. It is possible to record data for high-accuracy elastic wave exploration. In addition, a structure for sharing the lead wire of the sensor unit in the elastic wave exploration and the lead wire of the electrode (anchor and electrode) in the electric exploration is provided. Furthermore, noise during electrical connection between the anchor / electrode and the lead-only terminal of the sensor unit can be reduced.
[0017]
Further, in the above geological structure exploration measuring instrument, the insulating material covering the sensor unit covers the outer periphery of the pedestal on the anchor / electrode side so that the sensor unit and the pedestal are integrated. It is formed.
[0018]
Thereby, the shielding effect of the sensor unit covered with the insulating material and the pedestal can be enhanced.
[0019]
In the geological structure exploration measuring instrument, the lead wire terminal of the sensor unit and the anchor / electrode are electrically connected.
[0020]
Thereby, it becomes possible to share the lead wire of the sensor unit in the elastic wave exploration and the lead wire of the electrode (anchor and electrode) in the electric exploration, and the labor for installing the cable can be reduced. In addition, depending on the situation and environment of the measurement site, if noise is included when recording data during elastic wave exploration, grounding will be provided for the geological structure exploration measuring instrument to reduce noise. it can. In this case, it is preferable to connect the minus terminal for the lead wire of the sensor unit and the anchor / electrode.
[0021]
The geological structure exploration measuring instrument further includes means for closing a circuit including a lead wire connected to the sensor unit and the lead wire terminal when recording data for electrical exploration.
[0022]
Thereby, it is possible to prevent a potential difference from occurring between the terminals of the sensor unit during electric exploration, and as a result, it is possible to prevent damage to the sensor unit during electric exploration.
[0023]
Next, a geological structure exploration system according to the present invention includes the above-described geological structure exploration measuring instrument and a recorder that records elastic wave exploration data and / or electrical exploration data.
[0024]
This enables measurement equipment for geological exploration to be shared during elastic wave exploration and electrical exploration, and there is no need to change the instrument at the measurement point during elastic wave exploration and electric exploration. In addition, measurement data for electric exploration can be easily recorded.
[0025]
The geological structure exploration system further includes an analysis device that analyzes data recorded in the recorder.
[0026]
This makes it possible to perform a comprehensive analysis using different types of data recorded at the data recording site.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention described in the claims, and all combinations of features described in the embodiments are necessary for the solution of the invention. Is not limited.
[0028]
In the present embodiment, the search for the geological structure will be described as an example of the search for the internal structure. Hereinafter, a measurement instrument for geological structure exploration according to an embodiment of the present invention and a geological structure exploration system using the same will be described with reference to the drawings.
[0029]
FIG. 1 is a side view of a pickup constituting the measuring instrument for geological structure exploration of the present invention. In the present embodiment, it is referred to as a “pickup” including a case where it is used in an electric exploration together with a vibration pickup that is an elastic wave measurement module in an elastic wave exploration.
[0030]
From FIG. 1, the pickup includes a sensor unit 11 that detects elastic waves, an anchor / electrode 15 that is used as an electrode for installing the sensor unit 11 at a measurement point and in electric exploration, and a sensor unit 11 and an anchor / electrode 15. And a pedestal 14 provided therebetween.
[0031]
Here, in order to insulate the sensor unit 11 from the outside and to have weather resistance, the sensor unit 11 is covered with a cover 12 including the base 14 and having insulation and excellent weather resistance. For the cover 12, for example, hard plastic that is excellent in insulation and weather resistance and easy to process is used. The sensor unit 11 includes positive and negative lead wires for transmitting the measured elastic wave signal. A lead wire 13 is connected to each electrode in order to transmit the signal of the sensor unit 11 to an elastic wave exploration recorder provided outside. Note that an accelerometer is generally used as the sensor unit 11.
[0032]
The anchor / electrode 15 is used to fix and install the pickup on the ground surface of the measurement point, and is also used as an electrode for measuring the potential at the time of electric exploration. Therefore, the anchor / electrode 15 is conductive and needs to have a hardness that does not easily break even if the anchor / electrode 15 is inserted or driven into the ground surface or rock. As a material of the anchor / electrode 15, for example, stainless steel, brass, or copper is used.
[0033]
The pedestal 14 is in contact with the sensor unit 11 and has a configuration that can be connected to the anchor and electrode 15. Here, the base 14 must be an insulating material so that the sensor unit 11 is insulated. Artificial earthquakes in elastic wave exploration include waves with a frequency of about 1000 Hz, and the exploration of geological structures in tunnels also requires measurement of elastic waves with a frequency of about 200 to 300 Hz. Therefore, the pedestal 14 is preferably made of a material that is less attenuated even in a relatively high frequency wave transmitted from the anchor / electrode 15 to the sensor unit 11, and as a result, a highly accurate elastic wave exploration can be performed. Therefore, the pedestal 14 is preferably an insulator and a material having a high elastic coefficient comparable to that of a metal. FIG. 3 is a diagram showing the elastic modulus E of typical materials, and FIG. 4 is a diagram showing the specific resistance of these materials. 3 and 4, for example, a ceramic material is used as a preferable material for the base 14.
[0034]
The sensor unit 11 must be covered with an insulating material and fixed in the cover 12 so that the elastic wave to be measured can be accurately measured. Therefore, the cover 12 and the base 16 are bonded with an adhesive or the like so that the sensor unit 11 is pressed by the cover 12 and the base 14. Thereby, the sensor unit 11 is fixed in the vertical direction in the cover 12.
[0035]
Further, as shown in the cross-sectional view including the sensor unit 11 shown in FIG. 2, a plurality of protrusions 18 are provided inside the cover 12 in order to fix the sensor unit 11 in the lateral direction. Although FIG. 2 shows an example in which four protrusions 18 are provided, the present invention is not limited to this. Further, in order to fill a gap between the sensor unit 11 and the cover 12, the gap is filled with a silicon rubber filler or the like. The elastic wave measurement unit including the sensor unit 11, the cover 12, the pedestal 14, the lead wire 13, and the electrode connection line 16 is referred to as an "elastic wave measurement unit".
[0036]
The pedestal 14 is provided with an anchor connection screw for fixing the anchor / electrode 15 to the pedestal 14 on the anchor / electrode 15 side of the pedestal 14. Thereby, the elastic wave measuring part including the sensor unit 11 and the pedestal 14 can be connected after the anchor / electrode 14 is inserted or driven into the measurement point. In addition, the elastic wave measuring unit and the anchor / electrode 15 can be stored separately, and the storage becomes easy. Furthermore, even when one of the elastic wave measuring unit or the anchor / electrode 15 is damaged, only the damaged one needs to be replaced.
[0037]
Further, the base 14 is provided with a hole (not shown) for connecting the anchor / electrode 15 and the lead wire terminal of the sensor unit 11 with the electrode connecting wire 16 through the gap between the sensor unit 11 and the cover 12. Yes. The position of the hole of the pedestal 14 is positioned in the gap between the sensor unit 11 and the cover 12 on the sensor unit 11 side, and when the anchor / electrode 15 is fixed to the pedestal 14 on the anchor / electrode 15 side, It is preferable that the electrode connection line 16 extending from the pedestal 14 is at a position covered with the anchor and electrode 15. Thereby, the connection between the electrode connection line 16 and the lead wire terminal of the sensor unit 11 is facilitated, and noise during measurement can be reduced. The gap between the hole provided in the base 14 and the electrode connection line 16 is filled with an insulating material such as an adhesive. Further, a soft and highly conductive sheet-like material is provided at a portion where the electrode connection line 16 and the anchor / electrode 15 are in contact with each other, and the electrode connection line 16 and the anchor / electrode 15 are in contact with each other through this material. You may do it. Thereby, the noise reduction effect can be further enhanced. In addition, as a soft sheet-like material having high conductivity, for example, a gold flake may be used. In addition, in FIG. 1, although the electrode connection line 16 has shown the example connected to the minus terminal for lead wires of the sensor unit 11, what is necessary is just to be connected to any one lead wire terminal, It may be connected to a plus terminal.
[0038]
FIG. 5 is a side view of a second example of a pickup used as a measurement instrument for geological structure exploration. In FIG. 5, the same members / parts as those in FIG.
[0039]
The difference between the pickups shown in FIGS. 1 and 5 is the structure of the cover 12a. FIG. 1 shows an example in which the cover 12 and the base 14 are bonded with an adhesive, but in FIG. 5, the cover 12 a covers the outer periphery of the base 14 on the anchor / electrode 15 side so as to wrap. The cover 12a is formed so that the sensor unit 11 and the base 14 are integrated. Thereby, the shielding effect which prevents foreign materials, such as water, approaching into the sensor unit 11 side covered with the cover 12a and the base 14 can be heightened.
[0040]
FIG. 6 is a side view of a third example of a pickup used as a geological structure exploration measuring instrument. In FIG. 6, the same members / parts as those in FIG.
[0041]
In the pickup shown in FIG. 6, the pedestal 14b is made of a conductive material, and includes a protrusion that projects into the gap between the sensor unit 11 and the cover 12b. In this pickup, an insulating material is provided between the sensor unit 11 and the conductive base 14b in order to insulate the sensor unit 11.
[0042]
FIG. 7 is an enlarged view of a connection portion between the sensor unit 11 and the anchor / electrode 15 of the pickup shown in FIG. 8 is a cross-sectional view including the sensor unit 11 and the protrusion 19 in the pickup shown in FIG. The pedestal 14b uses a conductive material for potential measurement using the anchor / electrode 15 during electric exploration, and connects the lead wire terminal of the sensor unit 11 and the anchor / electrode 15 to the sensor unit 11 and the cover 12b. In order to facilitate electrical connection through the gap, a projection 19 is provided that projects into the gap between the sensor unit 11 and the cover 12b. By connecting the projection 19 and the lead wire terminal of the sensor unit 11 with the electrode connection line 16b, the anchor / electrode 15 and the lead wire terminal of the sensor unit 11 are electrically connected.
[0043]
In FIG. 7, in order to insulate the sensor unit 11 from the conductive base 14b, an insulating layer is provided between the sensor unit 11 and the base 14b. For example, when forming the cover 12b, the insulating layer may be formed including a portion to be the insulating layer. In this case, the insulating layer is a material for forming the cover, and as an example, is a hard plastic. In the case of hard plastic, as shown in FIG. 3, the elastic coefficient is lower than other materials. Therefore, in order to reduce the attenuation of the elastic wave measured by the sensor unit 11, a thin layer, for example, the thickness d shown in FIG. 7 is preferably about 1 to 2 [mm].
[0044]
As another example of the insulating layer, an insulating material having a higher elastic coefficient than that of the cover 12b, for example, a plate-like ceramic material may be sandwiched between the base 15b and the sensor unit 11.
[0045]
The concept of the circuit configuration when the anchor / electrode 15 and the lead wire terminal of the sensor unit 11 are electrically connected is shown in FIG. 9 and FIG. 9 and 10 is a take-out cable for electrically connecting each lead wire 13 and the elastic wave exploration recorder 22. A plurality of pickups can be connected to the takeout cable 21 via the lead wires 13, but in order to facilitate understanding, in FIG. 9 and FIG. Is shown. 9 and 10 show an example in which the electrode connection line 16 (16b) is connected to the negative terminal for lead wires.
[0046]
FIG. 9 shows a concept of a circuit configuration when data for elastic exploration is recorded in the elastic wave exploration recorder 22 using the sensor unit 11 at the time of elastic exploration. In recording the data for elastic wave exploration, as a result, the voltage between the terminals of the sensor unit 11 is measured to collect the data.
[0047]
When electrical exploration is performed in the state of the circuit shown in FIG. 9, there is a potential difference between the positive side and the negative side of the sensor unit 11 and the sensor unit 11 may be damaged during the electrical exploration. Therefore, as shown in FIG. 10, during the electric exploration, the lead wire terminals of the sensor unit 11 are short-circuited, that is, the circuit including the sensor unit 11 and the lead wire 13 is closed so that the electric exploration is recorded. Data is collected by measuring the potential between the reference point and the anchor electrode 15 by the device 23.
[0048]
As described above, by electrically connecting the anchor and electrode 15 and the lead wire terminal of the sensor unit 11, the lead wire of the sensor unit 11 at the time of elastic wave exploration and the anchor and electrode 15 at the time of electric exploration The lead wire when used as an electrode rod can be shared.
[0049]
When sharing the lead wire, in order to prevent damage to the sensor unit 11, a means for short-circuiting the lead wire terminal of the sensor unit 11 during electrical exploration to form a closed circuit is required. An example of means for providing this closed circuit will be described with reference to FIGS.
[0050]
FIG. 11 shows a connection example when connecting the takeout cable 21 and the elastic wave exploration recorder 22. In this case, the take-out cable 21 and the elastic wave exploration recorder 22 are connected as usual, and the elastic wave exploration recorder 22 processes signals from each sensor unit 11 and records them as elastic exploration data. .
[0051]
FIG. 12 shows a connection example when connecting the takeout cable 21 and the electric survey recorder 23. In this case, the takeout cable 21 and the electric survey recorder 23 are connected via the short-circuit connector 24. Here, the short-circuit connector 24 includes a mechanism for short-circuiting the plus side and the minus side of each sensor unit 11 and transmitting a current from each pickup functioning as an electrode to the electric survey recorder 23. The electric exploration recorder 23 processes the signal from each pickup functioning as an electrode and records it as electric exploration data.
[0052]
FIG. 13 is a diagram showing a connection state between terminals on the take-out cable 21 side and the electrical exploration recorder 23 side in the short-circuit connector 24. In the example of FIG. 13, an example in which four pickups can be connected to the takeout cable 21 is shown. Normally, 12 to 24 pickups can be connected to one takeout cable 21 in order to record signals from a plurality of pickups simultaneously, and 4 to 8 takeouts can be connected to the recorder simultaneously. The cable 21 can be connected simultaneously.
[0053]
In the example of FIG. 13, the terminal on the takeout cable side is a pair of terminal 1 and terminal 2, terminal 3 and terminal 4,..., Terminal 7 and terminal 8, and each pickup is electrically connected thereto. Is done. The terminals 1 and 2 on the takeout cable side are connected together to the terminal a on the recording device side. Thereby, a closed circuit including the sensor unit 11 and the lead wire 13 is formed, and a circuit as conceptually shown in FIG. 10 can be configured. In addition, the current from the anchor / electrode 15 functioning as an electrode during electric exploration is transmitted to the recording-side terminal a via the terminals 1 and 2. The same applies to the other terminals (terminals 3 and 4 and terminal b; terminals 5 and 6 and terminal c; terminals 7 and 8 and terminal d).
[0054]
12 and 13 show a means for physically closing the circuit including the sensor unit 11 and the lead wire 13 using the short-circuit connector 24, but the means for making the closed circuit is limited to this. It is not a thing. For example, a take-out cable is connected to a dual-purpose recording device that combines an elastic exploration recorder and an electric exploration recording device, and recording for elastic wave exploration or recording for electric exploration is selected in software. The signal from the pickup input to the dual-purpose recorder is controlled according to the software selection result. As a result, the dual-purpose recorder controls the signal so that the voltage from each sensor unit 11 can be measured and recorded during the elastic wave exploration, and during the electric exploration, the lead wire terminal of each sensor unit 11 is short-circuited, The potential difference between the reference point and the anchor / electrode 15 can be measured and recorded.
[0055]
FIG. 14 is a diagram showing a configuration example of a geological structure exploration system including a pickup that constitutes the geological structure exploration measuring instrument of the present invention. In FIG. 14, the same components as those described so far are denoted by the same reference numerals and description thereof is omitted.
[0056]
At the time of geological structure exploration, surveying is first performed in order to position measurement points at a measurement site. Next, a pickup is installed at each determined measurement point, and the pickup is connected to the recorder 22 and / or 23 using the takeout cable 21. In FIG. 14, reference numeral 1 denotes the pickup shown in FIG. 1, FIG. 5, or FIG. The measurement interval, which is the interval between the pickups 1, is usually about 5 to 10 [m] for elastic wave exploration, and about 2 [m] for electrical exploration when performing high-density resistivity exploration, and there are differences in measurement intervals. However, when a high-density (high accuracy) elastic wave exploration method is used for elastic wave exploration, the measurement interval of the elastic wave exploration is about 2 [m], and the measurement intervals can be unified. After the installation of the pickup 1 and the cable connection, data recording by elastic wave exploration and data recording by electric exploration are sequentially performed a predetermined number of times.
[0057]
In FIG. 14, the geological structure exploration system includes a pickup 1 and a takeout cable 21, and further includes an elastic wave exploration recorder 22 and / or an electric exploration recorder 23. Thereby, data recording for elastic wave exploration and electric exploration can be performed without re-installing the pickup 1 and the takeout cable 21. The elastic wave exploration recorder 22 and the electric exploration recorder 23 may be individual recorders, or may be dual-purpose recorders having both functions.
[0058]
The geological structure exploration system may further include an analysis device 33 using a PC or the like for analyzing recorded data. This makes it possible to analyze the recorded data together with the recording of the data on site.
[0059]
Survey data, which is position information such as the installation position of each pickup, is input to the analysis device 33 via the position information input device 31. If a GPS (Global Positioning System) that enables high-precision surveying can be installed in each pickup, the need for surveying measurement points is eliminated, and more efficient data recording can be performed.
[0060]
In the geological exploration system, by using the analysis device 33, elastic wave velocity data using the recorded elastic wave exploration data can be obtained, and specific resistance distribution data using the recorded electric exploration data can be obtained. it can. Furthermore, if the analysis device 33 can perform other analysis processing, for example, stability analysis processing by a finite element method (FEM) or the like, a ground model obtained from elastic wave velocity data and / or specific resistance distribution data. The stability analysis of the ground can be performed by using.
[0061]
If the analysis device 33 can perform the conversion analysis process, the elastic wave velocity data and the specific resistance distribution data are used to obtain the porosity indicating the degree of the gap in the rock, and the ground of the analysis target region It is possible to perform rock mass classification indicating the hardness of the rock. Further, the analysis device 33 obtains the saturation indicating the amount of water or air in the gap using the elastic wave velocity data and the specific resistance distribution data, and further, a geographic information system in which the map and the ground data are associated with each other. By using the information of (Geographical Information System: GIS), it is possible to estimate the location of the spring where water will come out. Furthermore, the analysis device 33 can also perform other processing, for example, creation of a basement depth distribution map, by using information of the data base device 32 that accumulates other information such as boring data and logging data. it can.
[0062]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within a scope not departing from the gist of the present invention.
[0063]
For example, in the present embodiment, the measurement tool for geological structure exploration and the geological structure exploration system for the purpose of exploring the geological structure have been described, but the structure to be explored is not limited to the geology. For example, the present invention can be applied to the exploration of the internal structure of an artificial structure.
[0064]
Further, in the present embodiment, the pickup 1 has a configuration in which the anchor / electrode 15 and the lead wire terminal of the sensor unit 11 are connected in advance by the electrode connecting wire 16 (16b). However, the present invention is not limited to this, and the pickup 1 extends the side of the electrode connection wire 16 (16b) connected to the lead wire 13 to the outside of the cover 12 (12a, 12b) in the same manner as the lead wire 13. The end of the electrode connection line 16 (16b) connected to the anchor / electrode 15 may be directly connected to the takeout cable 21. In this case, the end of the electrode connection line 16 (16b) is opened during the elastic wave exploration, and the end of the electrode connection line 16 (16b) is connected to the takeout cable 21 during the electric exploration. In this case, it is also possible to share only the pickup 1 for elastic wave exploration and electric exploration without sharing the cable.
[0065]
Further, in the present embodiment, the pedestal 14 (14b) used in the pickup has been described as having a screw structure as a configuration for fixing the anchor / electrode 15 to the pedestal 14, but the anchor / electrode to the pedestal 14 is also described. The 15 fixing means is not limited to this. For example, a protrusion having a protrusion at the tip may be provided on the anchor / electrode 15 side of the pedestal 14, and a latch mechanism that clips when the protrusion is inserted into the anchor / electrode 15 may be provided.
[0066]
【The invention's effect】
As described above, in the geological structure exploration measuring instrument according to the present invention, the sensor unit 11 that is covered with the cover 12 and detects elastic waves, and the anchor unit electrode that serves as an electrode in electric exploration while installing the sensor unit 11 at a measurement point. 15 and a pedestal that is provided between the sensor unit 11 and the anchor / electrode 15 and contacts at least the anchor / electrode 15 and connects the sensor unit 11 and the anchor / electrode. This enables measurement equipment for geological exploration to be shared during elastic wave exploration and electrical exploration, and there is no need to change the instrument at the measurement point during elastic wave exploration and electric exploration. It is also possible to easily collect measurement data for electrical exploration.
[0067]
Further, the geological structure exploration system of the present invention includes the above-described geological structure exploration measuring instrument and a recorder that records the elastic wave exploration data and / or the electric exploration data. This enables measurement equipment for geological exploration to be shared during elastic wave exploration and electrical exploration, and there is no need to change the instrument at the measurement point during elastic wave exploration and electric exploration. In addition, measurement data for electric exploration can be easily recorded.
[Brief description of the drawings]
FIG. 1 is a side view of a pickup which is an example of a geological structure exploration measuring instrument according to the present invention.
FIG. 2 is a cross-sectional view of a sensor unit portion of a pickup which is an example of a geological structure exploration measuring instrument according to the present invention.
FIG. 3 is a diagram showing an elastic modulus E of a typical material.
FIG. 4 is a diagram showing specific resistances of typical materials.
FIG. 5 is a side view of a pickup of another example of the geological structure exploration measuring instrument according to the present invention.
FIG. 6 is a side view of a pickup of another example of the geological structure exploration measuring instrument of the present invention.
7 is an enlarged view of a connection portion between the sensor unit of the bip-up shown in FIG. 6 and an anchor / electrode. FIG.
8 is a cross-sectional view of a sensor unit portion of the pickup shown in FIG.
FIG. 9 is a diagram illustrating a concept of a circuit including a sensor unit and a lead wire at the time of elastic wave search.
FIG. 10 is a diagram illustrating a concept of a circuit including a sensor unit and lead wires during electric exploration.
FIG. 11 is a diagram showing an example of connection between an elastic wave exploration recorder and a takeout cable.
FIG. 12 is a diagram showing an example of connection between an electrical survey recorder and a takeout cable.
FIG. 13 is a diagram showing a connection example of a short-circuit connector used when connecting an electric survey recorder and a takeout cable.
FIG. 14 is a diagram showing a configuration example of a geological structure exploration system.
[Explanation of symbols]
1 Pickup
11 Sensor unit
12, 12a, 12b Cover
13 Lead wire
14, 14b pedestal
15 Anchor and electrode
16, 16b Electrode connection line
21 Takeout cable
22 Elastic Wave Survey Recorder
23 Electrical exploration recorder
24 Short-circuit connector
33 Analyzer

Claims (10)

A sensor unit that is covered with an insulating material and detects elastic waves;
Anchor and electrode provided for use as an electrode in installation of the sensor unit at a measurement point and electric exploration,
A geological structure exploration comprising: a pedestal provided between the sensor unit and the anchor / electrode, contacting at least the anchor / electrode and connecting the sensor unit and the anchor / electrode measurement tool. One or a plurality of members including the pedestal provided between the sensor unit and the anchor / electrode are insulated between the sensor unit and the anchor / electrode, and measured by the sensor unit. 2. The geological structure exploration measuring instrument according to claim 1, wherein the measuring instrument is selected so as to reduce the influence of wave attenuation. 3. The geological structure exploration measuring instrument according to claim 1, wherein the pedestal uses a ceramic material. The pedestal is provided with a hole for connecting the anchor and electrode and the lead wire terminal of the sensor unit with an electrode connection line through a gap between the sensor unit and an insulating material covering the sensor unit. The measuring instrument for geological structure exploration according to claim 3 characterized by things. The pedestal is a metal material, and includes a protruding portion that protrudes into a gap between the sensor unit and an insulating material covering the sensor unit,
The geological structure exploration measurement according to claim 1 or 2, further comprising an insulating material between the pedestal and the sensor unit, which is less affected by attenuation of elastic waves measured by the sensor unit. Instruments. The insulating material covering the sensor unit covers the outer periphery of the pedestal on the anchor and electrode side so as to wrap, and is formed so that the sensor unit and the pedestal are integrated. The measuring instrument for geological structure exploration according to claim 5. The geological structure exploration measuring instrument according to any one of claims 1 to 6, wherein a lead wire terminal of the sensor unit and the anchor / electrode are electrically connected. The geological structure exploration according to claim 7, further comprising means for closing a circuit including a lead wire connected to the sensor unit and the lead wire terminal when recording data for electric exploration. measurement tool. The measuring instrument for geological structure exploration according to any one of claims 1 to 8,
A recorder for recording elastic wave exploration data and / or electrical exploration data;
A geological structure exploration system characterized by comprising The geological structure exploration system according to claim 9, further comprising an analysis device for analyzing data recorded in the recorder.

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