JPH06258451A - Boring epicenter system - Google Patents

Abstract

PURPOSE:To provide a boring epicenter system for propagating vibration correctly from a shaker to the crust. CONSTITUTION:A cylinder section 1 is fixed to a casing 20 constituting the body part of a boring epicenter system and a pair of actuator bases 2 are arranged on the cylinder section while opposing each other. A piezoelectric actuator 3 is inserted into a recess 2a made in each actuator base 2 and press supported by means of an actuator pad 4 fixed to the actuator base 2. Pressure oil is then introduced into a first oil chamber 5 formed on the inside of each actuator base 2 in order to push the actuator base 2 outward thus pressing the outer face of the actuator pad 4 against the wall of a bore 11 and securing the casing 20. The actuator 3 is operated under that state and shaking power is propagated through the actuator pad 4 to the wall of bore (crust).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a borehole source device which gives strain to the earth's crust, and more particularly to a borehole device capable of properly transmitting the vibration of an actuator as an exciter to the earth's crust.

[0002]

2. Description of the Related Art Conventionally, for ground investigations, it has been practiced to install an earthquake vibration generator (hole seismic source device) in a borehole deeply formed in the ground. And, as such a hole source apparatus, for example, U.S. Pat. No. 4,862,990
The ones described in the specification are known. That is, this device causes a flexible film body stretched over a part of a tubular body to intermittently bulge by intermittently supplying pressure oil to the inner space of the film body, At this time, the vibration of the flexible film body is used as an exciting force for the crust.

[0003]

By the way, in the conventional borehole source device as described above, since the fixing means for fixing the device body to the hole wall of the boring hole is not provided, the vibration force is properly applied. There is a problem that it is not transmitted to the hole wall (crust). The present invention is intended to solve such a problem, and is extruded from the casing toward the hole wall of the boring hole to the casing forming the main body of the borehole source device, and the casing is bored. Vibration of the vibration exciter is installed by attaching a fixture for fixing it to the hole wall of the device, attaching a vibration exciter to the same device, and operating the vibration exciter with the fixture pressed against the hole wall. It is an object of the present invention to provide a hypocenter source device capable of being properly transmitted to a hole wall (crust).

[0004]

In order to achieve the above-mentioned object, a borehole source device of the present invention is a borehole source device inserted and arranged inside a borehole formed in the ground.
A casing that constitutes the main body of the borehole central earthquake source device, an actuator as an exciter, and a fixture that is attached to the casing and is capable of attaching the actuator. A pair of actuator bases that are slidably opposed to each other in a direction orthogonal to the actuator base; a recess formed in the actuator base for inserting the actuator; and a recess for inserting the actuator; An actuator pad that can be crimped to the outer end surface of the actuator inserted into the recess and the actuator base is moved outward and inward together with the actuator pad to move the actuator pad with respect to the inner wall of the boring hole. It has a hydraulic chamber for pushing and retracting. It is characterized in that.

[0005]

In the above-described borehole source device of the present invention, when pressure oil is supplied to the hydraulic chamber of the fixator, the actuator base is pushed out toward the hole wall of the boring hole together with the actuator pad, and the outer surface of the actuator pad is It is pressed against the wall of the hole and acts to fix the casing to the boring hole. By operating the vibration exciter attached to the fixing device while maintaining this state, the vibration of the vibration exciter is properly transmitted to the hole wall of the boring hole via the actuator pad.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings, a central borehole device according to an embodiment of the present invention will be described. FIGS. 1 and 2 are side sectional views of a fixing device, FIG. 3 is a view taken in the direction of arrow A in FIG. 1, and FIG. FIG. 5 is a partially cut side view of the whole, and FIG. 5 is a schematic perspective view of a fixing device mounting portion.

The central borehole device of this embodiment is also inserted into the borehole to apply vibration to the bore wall of the borehole 11. In FIGS. 1 and 2, reference numeral 20 indicates the main body portion of the borehole source device. It shows a pipe-shaped casing constituting
The cylinder portion 1 of the fixing device 10 is fixed to the casing 20 at right angles to its axis. A pair of actuator bases 2 and 2 are slidably opposed to the cylinder portion 1. Each actuator base 2 is formed with six recesses 2a having openings facing outward.
The piezoelectric actuator 3 is attached to a. Code 3
Reference numeral a denotes an element head fitting attached to each piezoelectric actuator 3. Furthermore, each actuator base 2
The actuator pad 4 is provided on the outer end surface of the
It is attached so as to come into pressure contact with a.

Each actuator base 2 of the cylinder portion 1
A first oil chamber 5 is formed at a position facing the inner end surface of each. Then, annular first oil passages 6 a, 6 a communicating with the respective first oil chambers 5 are formed in the cylinder portion 1, and the respective first oil passages 6 a, 6 a are connected to the first oil pipe 6. An annular flange portion 2b is formed on each actuator base 2, and the second oil chamber 7 is formed by the flange portion 2b, the outer peripheral surface of the actuator base 2 and the inner peripheral surface of the cylinder portion 1. Further, annular second oil passages 8a, 8a communicating with the second oil chamber 7 are formed in the cylinder portion 1, and each second oil passage 8 is formed.
a and 8a are connected to the second oil pipe 8. Reference numeral 9 in the figure
Is a hermetic seal, and reference numeral 9a is a lead wire connected to the bottom surface of each piezoelectric actuator 3 via the hermetic seal 9.

As shown in FIG. 4, the casing 20 is made of a long pipe material. Then, the upper end (see FIG.
An insertion port 10a for a cable 21 (details of the cable 21 will be described later) is formed at the upper left end of the. A hydraulic unit composed of a hydraulic pump 22, an oil tank 23, and a hydraulic control unit 24 is arranged at substantially the center of the casing 20,
Further, at the lower end part, six groups of the fixtures 10 described with reference to FIGS. 1 to 3 (each of the fixtures 10 is provided with six piezoelectric actuators 3 as the vibrators as described above) are installed. , Are installed with the following correlation. (Note that in FIG. 4, for convenience of explanation, the fixing device 10 is provided with auxiliary symbols a, b, to f in order from the one located on the upper side).

That is, the fixing device 10a is located above the fixing device 10b and with respect to the fixing device 10b in the vibration direction of the actuator 3 attached thereto (in the axial direction of the actuator 3, aa in FIGS. 4 and 5). And bb direction)
Mounted on casing 20 with a 60 ° offset
The reference numeral 10c indicates that the vibration direction (cc direction in FIGS. 4 and 5) of the actuator 3 attached to the fixing device 10b below the fixing device 10b is shifted by 60 °, and at the same time, the actuator of the fixing device 10a. 60 for 3 vibration directions
They are attached to the casing 20 with a shift (see FIG. 5). Further, the three fixing devices 10d to 10f are also attached to the casing 20 with the same correlation between them.

The cable 21 is made up of an assembly of electric power lines for driving the hydraulic pump 22, control signal lines of the hydraulic control section, and electric wires of the excitation signal lines of the piezoelectric actuators 3, and the cable 21 is used for ground control. It is connected to the room.
Reference numeral 25 in FIG. 4 indicates a cable head. Also,
The first oil pipe 6 and the second oil pipe 8 are connected to the hydraulic control unit 24 by oil pipes (not shown).

Next, the operation of the fixing device 10 will be described. FIG. 1 shows a non-actuated state of the fixing device 10, that is, a state where the actuator pad 4 is in the storage position. Casing 20
Is inserted into the boring hole 11 formed in the ground to a predetermined depth while keeping each fixing device 10 in this inoperative state. At this time, pressure oil is supplied to the second oil chamber 7, and the actuator pad 4 (including the actuator base 2) is held in this state. Next, when the first control signal is applied to the hydraulic control unit 24, the first oil pipe 6 is connected to the hydraulic pump 22 and at the same time the second oil pipe 8 is communicated with the oil tank 23.

As a result, the pressure oil is supplied to the first oil chamber 5, and at the same time, the pressure oil is discharged from the second oil chamber 7.
The pair of actuator bases 2 are pushed out toward the hole wall of the boring hole 11 together with the actuator pads 4 so as to oppose each other, and the actuator pads 4 fixed to the pair of actuator bases 2 are urged to stick to each other and fixed. The container 10 is in the operating state (state shown in FIG. 2). The transition from the operating state (state of FIG. 2) to the non-operating state (state of FIG. 1) is performed by giving a second control signal to the hydraulic control unit 24 to communicate the first oil pipe 6 with the oil tank 23. At the same time, the second oil pipe 8 is connected to the hydraulic pump 22 so that the pressure oil is discharged from the first oil chamber 5 and the pressure oil is supplied to the second oil chamber 7 at the same time.

When each piezoelectric actuator 3 is energized to operate each piezoelectric actuator 3 while keeping each fixing device 10 in the above-mentioned operating state, the vibration of each piezoelectric actuator 3 causes each element head metal fitting to vibrate. It can be transmitted to the hole wall of the boring hole 11 via 3a and the actuator pad 4. That is, the vibration of the piezoelectric actuator 3 can be applied to the hole wall while the actuator pad 4 is pressed against the hole wall, that is, in the state where the preload (static preload) is applied, and the vibration (exciting force) is appropriate. It becomes possible to convey to the crust. At this time, since the fixtures 10a to 10c and the fixtures 10d to 10f are attached while being shifted by 60 °, the casing 20, that is, the borehole source device is evenly supported in three directions with respect to the bore wall of the boring bore 11. While being supported by force, uniform exciting force can be applied in three directions centering on the installation position.

Since the fixing devices 10d to 10f are attached at positions different from the fixing devices 10a to 10c (different positions in the height direction), it is possible to generate an exciting force at different positions in the height direction in the ground. You can It is also possible to attach one set of fixing devices to another position in the height direction so as to apply the exciting force to many points. In addition, by using a piezoelectric actuator as a vibrating device, high frequency (0-20
It is possible to give crustal strain vibration of (00Hz) to the hole wall of the boring hole. A servo valve direct connection type hydraulic actuator may be used instead of the piezoelectric actuator.

As described above, in the hole borehole source device of this embodiment, the casing, that is, the hole borehole source device can be fixed to the hole wall of the boring hole by the fixing device attached to the casing, and the vibrator is attached to the fixing device. Since it is attached, the vibration of the vibration exciter can be properly transmitted to the hole wall (the crust) via the fixing device. In addition, since three sets of three fixers are attached to the casing while being offset by 60 ° from each other, and two sets are attached so as to be vertically displaced, the casing can be securely fixed and each of the fixers is fixed. The exciting force excited by can be transmitted to the crust evenly around the boring hole and from the upper and lower two places. Moreover, such a large number of vibrators can be compactly incorporated into a single hole source device, and when a piezoelectric type actuator is used, a high frequency (for example, 0 to 2000H) is used.
The exciting force of z) is obtained.

[0017]

As described above in detail, according to the borehole source device of the present invention, the following effects and advantages are obtained. (1) Since the fixing device is attached to the casing, it is possible to fix the central borehole device to the borehole during use. (2) Since the exciter is attached to the fixer, the vibration of the exciter can be transmitted to the crust via the fixator.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view of a central borehole device according to an embodiment of the present invention when a retainer is inoperative.

FIG. 2 is a side sectional view showing the same operation.

FIG. 3 is a view on arrow A in FIG.

FIG. 4 is a cutaway side view of the same portion.

FIG. 5 is a schematic perspective view of the fixing device mounting portion.

[Explanation of Codes] 1 Cylinder part 2 Actuator base 2a Recess 3 Piezoelectric actuator 4 Actuator pad 5 First oil chamber 6 First oil pipe 6a First oil passage 7 Second oil chamber 8 Second oil pipe 8a Second oil passage 9 Hermetic Seal 9a Lead wire 10 Fixer 11 Boring hole 20 Casing 21 Cable 22 Oil pump 23 Oil tank 24 Hydraulic control unit

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[Procedure amendment]

[Submission date] May 14, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings, a central borehole device according to an embodiment of the present invention will be described. FIGS. 1 and 2 are side sectional views of a fixing device, FIG. 3 is a view taken in the direction of arrow A in FIG. 1, and FIG. Partially cut side view of the whole, Fig. 5 is a schematic perspective view of the fixing device mounting portion , and Fig. 6 is
It is the same schematic plan view.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

The casing 20, as shown in FIG.
It is made of long pipe material. An insertion port for the cable 21 (details of the cable 21 will be described later) is formed at the upper end (uppermost left end in FIG. 4).
A hydraulic unit including a hydraulic pump 22, an oil tank 23, and a hydraulic control unit 24 is arranged substantially in the center of the casing 20, and at the lower end thereof, the fixing device 10 (each fixing device 10 described with reference to FIGS. As described above, the six piezoelectric actuators 3 serving as the vibrators are attached to each of the above, and are attached under the following correlation. (Note that in FIG. 4, for convenience of explanation, the fixing device 10 is provided with auxiliary symbols a, b, to f in order from the one located on the upper side).

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

That is, the fixing device 10a is the fixing device 10a.
including the axis b-b ′ of b and being orthogonal to the axis of the casing 20.
Fixing device which is parallel to the second virtual plane B and is located above the second virtual plane B by a distance D.
10a including the axis aa 'and the axis of the casing 20
On the intersecting first virtual plane A, with respect to the fixture 10b,
The vibration direction of the actuator 3 that is attached to them (Figure in the axial direction of the actuator 3 4,5, directions of a- a 'and b-b' in 6) 120 ° to each other Shifts <br/> to casing 20 Installed on . In addition, fixator 1
0c is parallel to the second virtual plane B and is downward by a distance D.
Of the casing 20 including the axis C-C 'of the fixator 10c.
On the third virtual plane C orthogonal to the axis of the
Against vibration direction downwards a and fixator 10b, the vibration direction of A Chi <br/> Yueta 3 (Fig. 4, 5, c- c in 6 '
Slide direction) 240 ° relative to the 120 ° shifted simultaneously vibrating direction of the actuator 3 fixator 10a, is attached to the casing 20 (see FIG. 5, 6). Further, the three fixing devices 10d to 10f are also attached to the casing 20 with the same correlation between them.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a side cross-sectional view of a central borehole device according to an embodiment of the present invention when a retainer is inoperative.

FIG. 2 is a side sectional view showing the same operation.

FIG. 3 is a view on arrow A in FIG.

FIG. 4 is a cutaway side view of the same portion.

FIG. 5 is a schematic perspective view of the fixing device mounting portion.

FIG. 6 is a schematic plan view of the same.

[Explanation of Codes] 1 Cylinder part 2 Actuator base 2a Recess 3 Piezoelectric actuator 4 Actuator pad 5 First oil chamber 6 First oil pipe 6a First oil passage 7 Second oil chamber 8 Second oil pipe 8a Second oil passage 9 Hermetic Seal 9a Lead wire 10 Fixator 11 Boring hole 20 Casing 21 Cable 22 Oil pump 23 Oil tank 24 Hydraulic control unit

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Added

[Correction content]

[Figure 6]

Claims (1)

[Claims] 1. A hole center seismic source device to be inserted and arranged in a bore hole formed in the ground, a casing constituting a main body of the hole center seismic source device, an actuator as an exciter, and the casing. A pair of actuator bases, which are mounted on the casing so as to be slidable in a direction orthogonal to the axis of the casing, and which are mounted on the actuator base. A recess for inserting the actuator having an opening facing outward, an actuator pad that is attached to the outer end surface of the actuator base and can be crimped to the outer end surface of the actuator inserted into the recess, and the actuator base. Move it outward and inward with the actuator pad A hole center epicenter device, comprising: a hydraulic chamber for pressing and retracting the tapad against the inner wall of the boring hole.