JP7286482B2 - Geological survey device and method - Google Patents

Description

The present invention relates to a geological survey device and method.

In order to investigate geology, there is a method of inserting a probe into a borehole and acquiring an image of the inner wall surface using a camera provided in the probe (see, for example, Patent Document 1 below). However, there is water in the borehole, and if this water is muddy, it will be difficult to take a clear picture of the inner wall of the borehole, so it is necessary to clean the water before starting photography. be.

JP-A-11-256560

Whether the water in the borehole is turbid or not cannot be determined unless the probe is lowered into the borehole each time to take a picture and an operator confirms the photographed image. Then, if the water is judged to be turbid, it is necessary to pull up the probe and clean the inside of the borehole.

At this time, when the boring hole is formed in the vertical direction, it is possible to relatively easily clean the water and photograph it by precipitating the turbid components in the water using a precipitant or the like.

On the other hand, if the boring hole is formed obliquely rather than vertically, such a method cannot be used. The work of removing turbidity from the water must be repeated until the water in the borehole becomes clean, which is a lot of labor.

SUMMARY OF THE INVENTION In view of the above technical problems, it is an object of the present invention to provide a geological survey apparatus and method that enable simple geological surveys even when oblique bore holes are used.

A geological survey device according to a first invention for solving the above problems,
a hollow rod-shaped rod that can be put in and taken out of the boring hole and allows water to flow through the inside;
A probe provided on the tip side of the rod and equipped with an imaging device for imaging the inner wall surface of the boring hole;
Provided on the outer circumference of the probe while being connected to the tip of the rod so that an annular gap that communicates with the inside of the rod and allows water that has passed through the inside to flow is formed between the probe and the probe and a cylindrical water outlet,
The opening portion at the tip of the water outlet portion is positioned closer to the rear end side of the rod than the imaging device, and the water that has passed through the gap flows from the opening portion toward the imaging range of the imaging device. It is characterized by being able to be jetted.

A geological survey device according to a second invention for solving the above problems,
In the geological survey device according to the first invention,
a tank containing water, and
and a pump for sending water in the tank from the rear end side of the rod into the inside of the rod.

A geological survey device according to a third invention for solving the above problems,
In the geological survey device according to the first or second invention,
It is characterized by comprising a control unit for controlling the movement of the rod in the extension direction and the angle change.

A geological survey device according to a fourth invention for solving the above problems,
In the geological survey device according to the third invention,
The controller may further control the operation of the pump.

A geological survey device according to a fifth invention for solving the above problems,
In the geological survey device according to any one of the first to fourth inventions,
It is characterized by comprising an image acquisition analysis unit that acquires an image captured by the imaging device.

A geological survey device according to a sixth invention for solving the above problems,
In the geological survey device according to any one of the first to fifth inventions,
The rod and the controller are provided in a boring machine installed on the ground surface.

A geological survey method according to a ninth invention for solving the above problems,
A geological survey method using the geological survey device according to the first invention,
a first step of moving the rod and the probe toward the bottom of the borehole to bring the imaging device as close to the bottom of the borehole as possible;
a second step of photographing the inner wall surface of the boring hole with the imaging device while moving the rod from the hole bottom side toward the entrance side of the boring hole;
a third step of acquiring an image captured by the imaging device;
In the second step, water is fed into the rod and jetted from the tip of the water outlet toward the imaging range of the imaging device while photographing by the imaging means.

According to the geological survey apparatus and method according to the present invention, it is possible to easily survey geological features even when the bore hole is an oblique hole.

1 is a schematic diagram showing the configuration of a geological survey device (before starting measurement) according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; 4 is a flow chart explaining the operation of the geological survey device according to the embodiment of the present invention; 1 is a schematic diagram showing the configuration of a geological survey device (during measurement) according to an embodiment of the present invention; FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A geological survey apparatus and method according to the present invention will be described below with reference to the drawings.

First, the configuration of the geological survey device according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. As shown in the schematic diagram of FIG. 1, the geological survey apparatus according to the present embodiment mainly includes a boring machine 11, a probe 12, an image acquisition analysis unit 13, a water discharge unit 14, a tank 15, and a pump 16. I have.

A boring machine 11 installed on the ground surface 2 is provided with a control section 11a and a rod 11b.

The rod 11b is a hollow rod that can move in the extension direction and change the inclination angle with respect to the ground surface 2, so that it can be put in and taken out of the boring hole 1. As shown in FIG. In addition, fresh water can flow through the interior (not shown), and the rear end side of the rod 11 b communicates with the pump 16 .

Fresh water is stored in the tank 15 . The pump 16 can suck up this fresh water and feed it into the interior of the rod 11 from the rear end side.

A control unit 11 a provided in the boring machine 11 controls the movement of the rod 11 b in the extension direction and the angle change, and further controls the operation of the pump 16 .

The probe 12 is provided on the distal end side of the rod 11b and extends parallel to the rod 11b. Also, an imaging device 12 a is provided at the tip of the probe 12 . The imaging device 12a is arranged so as to be able to photograph the inner wall surface 1a of the boring hole 1 . More specifically, the imaging device 12a is embedded in the probe 12, and the wall surface of the probe 12 at the position where the imaging device 12a is disposed is made of a transparent material (for example, an acrylic tube, etc.). , the inner wall surface 1a can be photographed.

The image acquisition and analysis unit 13 is generally called a borehole camera or borehole scanner, and includes a control unit 13a, a winch 13b, a cable 13c, a PC 13d, and the like.

The control unit 13a of the image acquisition/analysis section 13 is connected to the probe 12 by a cable 13c that is wound and pulled out by a winch 13b. An image of the inner wall surface 1a captured by the imaging device 12a is acquired by the control unit 13a via the cable 13a and analyzed by the PC 13d connected to the control unit 13a.

The water outlet part 14 is made of a material such as stainless steel, for example, and is arranged on the outer peripheral side of the probe 12 so that a gap G is formed between it and the probe 12, as shown in the cross-sectional view of FIG. It has a cylindrical shape.

In addition, the annular gap G between the outer peripheral surface 12b of the probe 12 and the inner peripheral surface 14b of the water outlet portion 14 shown in FIG. Clear water can be circulated. Furthermore, the tip of the water spout 14 is open, and this opening is positioned closer to the rear end of the rod 11b than the imaging device 12a. It is exposed.

Then, the clean water that has passed through the gap G is jetted from the tip 14a of the water outlet 14 toward the photographing range of the imaging device 12a of the probe 12. As shown in FIG.

The above is the description of the main configuration of the geological survey device according to the present embodiment. Principal operations of the geological survey apparatus according to the present embodiment configured as described above will be described below with reference to FIGS.

First, in step S1 in FIG. 3, in the boring machine 11, the inclination angle of the rod 11b is adjusted by the control unit 11a, and the rod 11b and the probe 12 are aligned parallel to the extending direction of the boring hole 1. 12 is moved toward the hole bottom 1b of the boring hole 1 to bring the imaging device 12a as close to the hole bottom 1b as possible, as in the state of FIG.

Next, in step S2, the inner wall surface 1a of the boring hole 1 is photographed. Specifically, as shown in FIG. 4, the rod 11b is moved from the hole bottom 1b side of the boring hole 1 toward the entrance 1c side, and the inner wall surface 1a of the boring hole 1 is photographed by the imaging device 12a.

At that time, the pump 16 is operated to send fresh water in the tank 15 to the rod 11b. Fresh water passes through the inside of the rod 11b and the gap G, and is jetted from the tip 14a of the water outlet 14 toward the imaging range of the imaging device 12a.

Finally, in step S3, the image acquisition analysis unit 13 acquires and analyzes the image data captured by the imaging device 12a.
The above is the description of the operation of the geological survey device according to the present embodiment.

That is, in the present embodiment, the photographing range of the imaging device 12a from the tip 14a of the water spout 14 during photographing of the inner wall surface 1a of the boring hole 1 without confirming whether or not the water accumulated in the boring hole is turbid. , and the clear water enters the water in the imaging range of the imaging device 12a, thereby making muddy water transparent and creating a favorable imaging environment.

Since the imaging device 12a performs imaging while moving the rod 11b, the imaging range of the imaging device 12a changes moment by moment, but clean water is always jetted from the tip 14a of the water spout 14 during imaging. Since it is the state, the transparency of the water in the imaging range of the imaging device 12a is maintained.

As a result, in this embodiment, it is not necessary to check the turbidity of the water accumulated in the borehole as in the conventional case, and it is possible to simply investigate the geology even if the borehole is oblique.

Although this embodiment has been described on the assumption that the boring hole is an oblique hole, the present invention is not limited to this, and can also be applied to boring holes formed in the vertical direction. .

INDUSTRIAL APPLICABILITY The present invention is suitable as a geological survey device and method.

1 boring hole 1a (boring hole 1) inner wall surface 1b (boring hole 1) hole bottom 1c (boring hole 1) inlet 2 ground surface 3 obstacle 11 boring machine 11a control unit 11b rod 12 probe 12a imaging device 12b (probe 12) tip surface 12c (of probe 12) outer peripheral surface 13 image acquisition analysis unit 13a control unit 13b winch 13c cable 13d PC
14 Water outlet 14a (of water outlet 14) tip 14b (of water outlet 14) inner peripheral surface 15 tank 16 pump 17 camera protection part

Claims (7)

a hollow rod-shaped rod that can be put in and taken out of the boring hole and allows water to flow through the inside;
A probe provided on the tip side of the rod and equipped with an imaging device for imaging the inner wall surface of the boring hole;
Provided on the outer circumference of the probe while being connected to the tip of the rod so that an annular gap that communicates with the inside of the rod and allows water that has passed through the inside to flow is formed between the probe and the probe and a cylindrical water outlet,
The opening portion at the tip of the water outlet portion is positioned closer to the rear end side of the rod than the imaging device, and the water that has passed through the gap flows from the opening portion toward the imaging range of the imaging device. allow it to be jetted,
The void is
formed between the outer peripheral surface of the probe and the inner peripheral surface of the water outlet,
having an annular shape,
A geological survey device, wherein water passing through the inside of the rod is formed to flow. a tank containing water, and
2. The geological survey apparatus according to claim 1, further comprising a pump for sending water in said tank from a rear end side of said rod into said inside of said rod. 3. The geological survey apparatus according to claim 2, further comprising a control section for controlling movement in the extension direction and angle change of the rod. 4. The geological survey apparatus according to claim 3 , wherein the control section further controls the operation of the pump. 5. The geological survey apparatus according to any one of claims 1 to 4, further comprising an image acquisition analysis unit that acquires an image captured by the imaging device. 5. A geological survey apparatus according to claim 3, wherein said rod and said control unit are provided in a boring machine installed on the surface of the earth. A geological survey method using the geological survey device according to claim 1,
a first step of moving the rod and the probe toward the bottom of the borehole so that an imaging device is as close to the bottom of the borehole as possible;
a second step of photographing the inner wall surface of the boring hole with the imaging device while moving the rod from the hole bottom side toward the entrance side of the boring hole;
a third step of acquiring an image captured by the imaging device;
In the second step, the geological survey method is characterized in that, along with photographing by the photographing means, water is fed into the rod and jetted from the tip of the water spout toward the photographing range of the photographing device. .

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