JP2000160978A - Image pickup device for boring bore - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image pickup device for a boring bore capable of positively picking up the image of the internal wall of the bore by cleaning a specified area in the bore including an image pickup position so as not to impede image pickup. SOLUTION: This image pickup device for a boring bore has a head part 2 with a camera part 3 built therein. Expansive partition bodies 4 are disposed in two specified parts of the head part 2, and a fresh water supply means and a mixed muddy water discharge means are connected to two specified parts of the outer periphery of the head part 2 held between two partition bodies 4. The head part 2 is inserted in the boring bore 50, and a specified area around the head part 2 is partitioned and isolated by the expansion of the partition bodies 4, and fresh water injection and mixed muddy water discharge are performed in the isolated specified area around the head part 2 to positively obtain transparency between the head part 2 and the internal wall of the boring bore 50 so as to obtain a clear image of the internal wall of the boring bore 50. The image can therefore be picked up even in the case of mixed muddy water staying in the boring bore 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a borehole imaging device for imaging the state of a borehole inner wall for observation and the like. In particular, even when turbid water is accumulated in the borehole, the inner wall is reliably formed. The present invention relates to a borehole imaging device capable of imaging.

[0002]

2. Description of the Related Art Conventionally, when observing the state of a hole wall in a bored hole for geological investigation, ground investigation, or the like, a borehole in-hole imaging device that inserts into the borehole from the ground surface to image the inner wall of the hole. (Borehole camera device) was used.

[0003] As such a conventional image pickup apparatus in a borehole, Japanese Patent Application Laid-Open No. Hei 1-210594 and Japanese Patent Application Laid-Open No.
The one disclosed in Japanese Patent No. 311401 is known,
FIG. 4 shows an example of such a borehole imaging device.
FIG. 4 is a schematic configuration diagram of a conventional borehole imaging device.

[0004] A conventional borehole imaging device 100 shown in the previous figure has a camera sonde 101 inserted into a borehole 50 and a camera sonde 101 inside the borehole 50.
104 for raising and lowering the camera, and the camera sonde 10
A depth measuring device 106 for measuring the depth in the first boring hole 50, and a control unit for controlling the camera sonde 101 and the elevator 104, and processing an image signal from the camera sonde 101, depth data from the depth measuring device 106, and the like. 103
And a television monitor 105 for displaying an image signal processed by the control unit 103, and a cable 102 for connecting these devices and transmitting and receiving signals and supplying power.

[0005] The camera sonde 101 comprises a camera 111 housed in a cylindrical tube 110 and a plane reflecting mirror 112 arranged at an angle of 45 degrees on the optical axis of the camera 111.
And a cylindrical glass window 11 attached to the cylinder 110
3 and a light bulb 114 for irradiating the outside of the glass window 113. The camera sonde 101 is configured to be rotatable around the axis of the boring hole 50 by driving means (not shown), and the direction in which the camera 111 is taking an image is detected by the azimuth measuring device 115. .

In the conventional borehole imaging apparatus having the above-described configuration, the camera sonde 101 is inserted into the borehole 50, and the depth in the borehole 50 is measured by the depth measuring device 10.
6, it is moved to a desired depth position by the elevator 104, and the azimuth at the position is detected by the azimuth measuring device 115. By doing so, it is possible to photograph the inner wall of the boring hole 50 at the desired position. The obtained image signal of the inner wall of the boring hole 50 is
It is sent to the control unit 103 and processed, and the television monitor 105
Will be displayed. By observing the display image on the television monitor 105 by the observer, it is possible to grasp the geology and the like at the point where the boring hole 50 is formed.

[0007]

Since the conventional borehole imaging apparatus is constructed as described above, if there is nothing in the borehole 50, the camera 111 can directly image the inner wall of the borehole 50. However, since water easily accumulates in the borehole 50 due to spring water and the like, and the accumulated water tends to be turbid due to earth and sand, when the camera sonde 101 is inserted into the borehole 50, the camera sonde 101 is removed.
Has a problem that it becomes difficult to image the inner wall of the boring hole 50 with the camera 111 due to the state surrounded by the turbid water.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a predetermined area in a borehole including an imaging position is cleaned so as not to interfere with imaging, and an imaging apparatus in a borehole capable of reliably imaging an inner wall. The purpose is to provide.

[0009]

A borehole imaging apparatus according to the present invention moves and rotates a camera unit inserted into a borehole in the ground in the borehole, and images the inside wall of the borehole. In the imaging device,
At least one end is closed, and at least a part of the outer peripheral wall is formed of a substantially cylindrical body having a predetermined length capable of transmitting light. The camera unit is built in, and the closed one end side can be inserted into and removed from the borehole. A head portion to be inserted, and a tube body which can be expanded and contracted by inserting and removing a predetermined fluid into and out of the inside, and at two predetermined positions separated by a predetermined distance in the axial direction of the head portion cylinder with respect to the camera unit built-in position of the head portion. Two partition members which are arranged around the outer periphery of the head portion and are inflatable and can be in close contact with the inner wall of the boring hole in a watertight state without any gap, and connected to each partition member of the outer periphery of the head portion from outside the boring hole, A partition body control means for supplying a fluid of a predetermined pressure or sucking the fluid, and connected to a predetermined position on the outer periphery of a head portion sandwiched between the two partition bodies from outside the boring hole to supply fresh water. A water supply means, and a turbid water discharge means for sucking water and turbid matter, which is connected to a predetermined position on the outer periphery of the head portion sandwiched between the two partition bodies from outside the boring hole, and inserted into the boring hole. In a state where the head portion is positioned at the imaging target portion of the camera portion, the two partition members are expanded by the partition member control means and brought into close contact with the inner wall of the boring hole, and the head portion and the boring member sandwiched between the two partition members are bored. The area between the inner walls of the hole is watertightly isolated from other parts,
Simultaneously with the supply of fresh water from the fresh water supply means, the turbid water is sucked and discharged by the turbid water discharge means, the space between the head portion and the inner wall of the boring hole is filled with fresh water to be transparent, and the light between the fresh water portion and the head portion can be transmitted. The camera section images the inner wall of the boring hole through the portion.

As described above, according to the present invention, a head unit having a built-in camera unit capable of capturing an image of an inner wall of a borehole is provided, and scalable partitions are provided at two predetermined positions of the head unit. A fresh water supply means and a turbid water discharge means are connected to a predetermined position on the outer periphery of the head portion sandwiched between the two partition members, and the head portion is inserted into a boring hole, and a predetermined region around the head portion is partitioned by expansion of the partition member. By injecting fresh water and discharging turbid water in a predetermined area around the isolated head part, the inside of the boring hole of the imaging target part of the camera unit can be reliably made transparent, and the inner wall of the boring hole in the camera unit can be made transparent. A clear image can be obtained, and even when turbid water is accumulated in the borehole, the inner wall of the bore can be imaged, which is highly convenient. Also, by filling a predetermined area around the head portion closed by the partition body with fresh water, the inner pressure of the bored hole is protected by the internal pressure of the filled fresh water, preventing collapse of the inner wall and preventing roughening of the inner wall due to excavation. This makes it easy to grasp and evaluate the images obtained by the camera unit.

In the borehole imaging apparatus according to the present invention, the camera section is disposed so as to be movable within a predetermined range in the axial direction of the head section as required. As described above, in the present invention, the camera unit is disposed in the head unit so as to be freely movable in the axial direction of the head unit, and the camera unit can be moved in any of the axial directions of the head unit cylinder to change the imaging position. Even when the head unit cannot be moved in close contact with the boring hole, the boring hole can be imaged over a predetermined range, and the imaging target in the head unit fixed state becomes wider. Reduces the need to shrink the body and move the entire head to the imaging position, expand the partition again, and inject fresh water and discharge turbid water to make it ready for imaging.Excellent handling and greatly improved workability. I do.

In the borehole imaging apparatus according to the present invention, if necessary, the fresh water supply means may be located closer to a partition member farther from a head end of an outer periphery of the head portion sandwiched between the two partition members. The turbid water discharging means communicates with the boring hole side at a predetermined position, and the turbid water discharge means is disposed at a predetermined position near the partition body near the tip of the head portion on the outer periphery of the head portion sandwiched between the two partition bodies. It communicates with. Thus, in the present invention, the boring hole communication position of the fresh water supply means is disposed closer to the partition member farther from the head end of the outer periphery of the head portion, and the boring hole communication position of the turbid water discharging means is set to the head. Arranged near the partition body near the tip of the head part on the outer periphery of the head part, and the movement direction of the clear water and the turbid water in the area between the head part and the inner wall of the boring hole sandwiched between the two partition bodies together with the head part By making the flow of fresh water and turbid water uniform as the tip direction,
The flow state of the fresh water and the turbid water is simplified, and both are hardly mixed, and the turbid water can be smoothly replaced with the fresh water. Furthermore, when the direction of the boring hole is downward with respect to the surface of the earth, the turbid matter in the turbid water, which has a higher specific gravity than water, can be discharged more smoothly because the fresh water supply side is upward and the turbid water suction side is downward. Transparency can be achieved in time.

Further, in the borehole imaging apparatus according to the present invention, the partition body control means supplies compressed air as a predetermined fluid to the inside of the partition body and sucks it as needed. As described above, in the present invention, the compressed air is used as the fluid that enters and exits the partition body, and the compressed air is supplied or sucked to the inside of the partition body so that the partition body can be expanded and contracted. This can be performed in a short time, and the transition from the moving state of the head unit to the image-capable state can be performed in a shorter time.

Further, in the borehole imaging apparatus according to the present invention, if necessary, the partition body is provided with water as a predetermined fluid therein, and the fresh water supply means serves as the partition body control means. In addition to supplying fresh water of a predetermined pressure to the inside of the body, the turbid water discharging means also sucks water from each partition body. As described above, in the present invention, the fresh water supply means and the turbid water discharge means are diverted as the partition body control means, and water is supplied or sucked into the interior of the partition body so that the partition body can be expanded and contracted, so that the inside of the head unit can be controlled. The fluid supply / discharge system can be limited to the water system, so that the structure is simplified and the size of the head portion can be further reduced.

Further, in the borehole imaging device according to the present invention, if necessary, the camera section may include an imaging device and an imaging center axis extension of the imaging device provided in a cylindrical body having an outer peripheral portion made of a transparent material. A reflecting means which is arranged at a predetermined angle to the inner surface of the boring hole and which can be imaged by the imaging means through the light transmitting part of the cylindrical body and the head part, and a light transmitting part of the cylindrical body and the head part. And illumination means for irradiating illumination light toward the inner wall of the borehole to be imaged. As described above, in the present invention, the camera unit includes the imaging unit, the reflection unit, and the illumination unit, and reflects the inner wall of the boring hole illuminated by the illumination unit to the reflection unit and captures the image with the imaging unit. Can be arranged so that the camera section can be configured to be the smallest regardless of the actual imaging direction, and the head section can be further miniaturized accordingly. I can do it.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment of the Present Invention) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of a borehole imaging device according to the present embodiment, and FIG. 2 is a cross-sectional view of a head portion of the borehole imaging device according to the present embodiment.

As shown in the drawings, the imaging apparatus 1 in a borehole according to the present embodiment has a window 2a made of a transparent material in a predetermined area of the outer peripheral wall and closed at one end. A head part 2 formed of a substantially cylindrical body made of metal and inserted into the boring hole 50 of the ground 40 so as to be able to be inserted into and removed from the boring hole 50 with one end side closed as a tip. A camera unit 3 rotatably stored, and a tube body formed to be expandable and contractable by taking compressed air in and out of the interior, and a predetermined interval in the axial direction of the head unit 2 with the camera unit 3 built-in position of the head unit 2 interposed therebetween. Two partitioning bodies 4 which are arranged so as to surround the outer periphery of the head portion 2 at predetermined two places apart from each other, and which can be inflated by filling with compressed air and can be tightly adhered to the inner wall of the boring hole 50 in a watertight state without gaps; From the outside to each partition 4 The partition body control means 5 which supplies compressed air of a predetermined pressure to the inside of the partition body 4 or sucks the compressed air under reduced pressure, and the outer periphery of the head portion 2 sandwiched between the two partition bodies 4 from outside the boring hole 50. A fresh water supply means 6 connected to a predetermined position near the partition 4 far from the tip of the head 2 for supplying fresh water, and a head on the outer periphery of the head 2 sandwiched between the two partitions 4 from outside the boring hole 50 The turbid water discharging means 7 is connected to a predetermined position near the partition 4 closer to the tip of the part 2 and suctions moisture.

The camera section 3 comprises a cylindrical body 10 made of a transparent material as a casing, a camera 11 as an image pickup means stored inside the cylindrical body 10, and a cylindrical body 10.
The reflection as reflection means which is arranged at an angle of 45 ° on the extension of the imaging center axis of the inner camera 11 and allows the camera 11 to image the inner wall of the bore hole 50 through the cylindrical body 10 and the window 2 a of the head 2. A mirror 12 and the cylindrical body 1
The illumination lamp 13 is disposed inside the cylinder 10 and illuminates the illumination light toward the inner wall of the boring hole 50 to be imaged through the cylindrical body 10 and the window 2a of the head 2.
It is a configuration provided with: The inner wall of the boring hole 50 illuminated by the illumination lamp 13 is reflected by the reflecting mirror 12 so that the camera 1
1, the camera 1 in the camera unit 3
The orientation of 1 can be arranged so that the camera section 3 can be configured to be the smallest regardless of the actual imaging direction, and the head section 2 is also reduced in size by that amount, so that it is possible to cope with a small diameter boring hole 50. The camera unit 3 is configured to be rotatable around a cylinder axis of the head unit 2 by a driving unit (not shown), and the direction in which the camera 11 is shooting is detected by an azimuth measuring device (not shown). It is supposed to be.

The camera 11 inside the camera section 3 includes:
A drive source (not shown) such as a motor is mounted, and the focal length can be adjusted by driving the drive source. Further, the camera 8 is connected to a cable 8 that has reached the inside of the head unit 2 from outside the boring hole 50.
It transmits and receives image signals and the like of the camera 11 and supplies power.
A control unit, a television monitor (not shown), and the like are connected to the opposite end of the cable 8. These configurations and operations are the same as those of the above-described conventional device.

When the head portion 2 is inserted deeper into the boring hole 50, one or a plurality of extension casings 9 made of a metal or a synthetic resin or the like and formed in a substantially cylindrical body having both open ends are used. This extension casing 9
The open ends are formed so that they can be detachably connected to each other while maintaining waterproofness and airtightness, and one of the open ends is detachably formed in a waterproof and airtight state with respect to the open end of the head portion 2. Extension casing 9
Is connected to the open end of the head portion 2 and inserted into the boring hole 50.
The extension casings 9 are extended in series by connecting a plurality of extension casings 9 in series by connecting the open ends with each other as the insertion depth of the extension casing 9 increases. The cable 8 reaching the head 2 from outside the boring hole 50 is passed through the inside of the extension casing 9.

At the ground surface side entrance of the boring hole 50,
A driving device (not shown) for moving the head portion 2 and the extension casing 9 into and out of the boring hole 50 and rotating the head portion 2 with respect to the boring hole 50, and adjusting the reaching depth of the head portion 2 from the insertion state of the head portion 2 and the extension casing 9 Depth measuring devices (not shown) for detection are provided.

Next, an image pickup operation of the image pickup apparatus in the borehole according to the present embodiment will be described. All the extension casings 9 to be connected and used up to the insertion depth in advance
Through the cable 8. Then, the head portion 2 in which the camera portion 3 is built is inserted into the boring hole 50 at the head, and the boring hole 50 of the head portion 2 is sequentially connected to the extension casing 9 according to a required insertion depth. While the depth in the inside is detected by a depth measuring device (not shown), it is inserted to a desired depth position by a driving device (not shown).

When the head portion 2 is located at a desired depth and the space between the head portion 2 and the inner wall of the boring hole 50 is transparent (there is nothing or only clear water), the camera is left as it is. An image of the inner wall of the boring hole 50 can be taken by using the camera 11 of the section 3. However, when turbid water is accumulated in the boring hole 50, the head section 2 and the boring hole 50 can be imaged.
Since the space between the inner wall and the inner wall becomes opaque and imaging cannot be performed as it is, an operation of making the space between the head unit 2 and the inner wall of the boring hole 50 transparent is performed. First, compressed air is sent to the two partition members 4 by the partition member control means 5, and each partition member 4 is expanded and brought into close contact with the inner wall of the boring hole 50, and the head portion 2 sandwiched between the two partition members 4 is bored. The area between the inner walls of the holes 50 is watertightly isolated from other parts. Turbid water is contained in an isolation region between the head portion 2 and the inner wall of the boring hole 50 sandwiched between the two partition members 4.

After the partition body 4 and the inner wall of the boring hole 50 are brought into close contact with each other, fresh water is supplied from the fresh water supply means 6 to the isolated area between the head portion 2 and the inner wall of the boring hole 50, and simultaneously the turbid water is discharged by the turbid water discharging means 7. Suction is discharged from this isolated area, and the isolated area between the head portion 2 and the inner wall of the boring hole 50 is filled with clear water to make it transparent. The communicating position of the fresh water supply means 6 to the boring hole 50 is set closer to the partition 4 farther from the tip of the head portion 2, and the communicating position of the turbid water discharging means 7 to the boring hole 50 is set closer to the tip of the head portion 2. The flow direction of the fresh water and the turbid water is simplified by making the flow of the clear water and the turbid water uniform in the separation area, with the moving direction of the clear water and the turbid water being both in the direction of the tip of the head portion 2 in the isolation region. Will be difficult to mix
Cloudy water can be smoothly replaced with fresh water. Further, since the fresh water supply side is located above and the turbid water suction side is located below, the turbid matter in the turbid water having a higher specific gravity than water can be smoothly discharged.

When the inner wall of the boring hole 50 is made transparent enough to capture an image, the camera unit 3 is rotated by a driving means (not shown) to turn the imaging direction of the camera 11 in a desired direction, and a driving source (not shown). ), The camera 11 is adjusted to an appropriate focal length, and the illumination lamp 13 irradiates the inside of the boring hole 50, and the inner wall of the boring hole 50 at the desired position is cleaned with the fresh water portion and the head 2.
Is taken by the camera 11 through the window 2a. Boring hole 50 reflected by reflector 12 and imaged by camera 11
An image of the inner wall is output as an imaging signal, input to a control unit (not shown) via the cable 8, appropriately processed, and displayed on a television monitor (not shown). The observer observes the state of the inner wall of the bowling hole 50 displayed on the television monitor.

When the imaging of the first desired position is completed, the compressed air in the partition body 4 is sucked and discharged by the partition body control means 5 to separate the partition body 4 from the inner wall of the boring hole 50, and the head is moved to the position where the next imaging is performed. The part 2 is moved. After the movement of the head unit 2, the partition body 4 is brought into close contact with the inner wall of the boring hole 50 in the same manner as described above, and the subsequent operations are repeated to perform imaging.

As described above, in the borehole imaging apparatus according to the present embodiment, two expandable and contractible partition members 4 are provided in the head portion 2 having the camera portion 3 therein, and two partition members 4 are provided. The fresh water supply means 6 and the turbid water discharge means 7 are connected to a predetermined position on the outer periphery of the head portion 2 sandwiched between the holes, and after the head portion 2 reaches the predetermined position of the boring hole 50, the partition body 4 is moved to the inner wall of the boring hole 50. Since a predetermined area around the head section 2 is separated and isolated in close contact with the head, the fresh water is injected and the turbid water is discharged in the isolated area around the head section 2, so that a boring hole in the imaging target portion of the camera section 3 is formed. The inside of the bore 50 can be reliably made transparent, and a clear image of the inner wall can be obtained by the camera unit 3 even when turbid water remains in the borehole 50. Further, since the partition body 4 can be expanded and contracted by supplying or sucking compressed air into the partition body 4 by the partition body control means 5, the expansion and contraction of the partition body 4 can be performed smoothly and in a short time, and the efficiency of the imaging operation can be improved. Improvement can be achieved.

(Second Embodiment of the Present Invention)
The embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view of the head portion of the imaging device in a borehole according to the present embodiment.

As shown in the figures, the in-boring hole imaging apparatus 1 according to the present embodiment comprises a head unit 2, a camera unit 3, a partition body 4, and a partition body control, similarly to the first embodiment. Means 5, fresh water supply means 6, and turbid water discharge means 7, but the difference is that the camera section 3 is stored inside the head section 2 movably in the axial direction of the head section. is there.

The camera unit 3 is disposed movably in the axial direction of the cylinder of the head unit 2 within a region sandwiched between the two partitioning bodies 4. The camera unit 3 moves within the head unit 2 and the head unit 2 moves. 2
Even in the case of a stop, the imaging position can be changed within the range of both partition members 4.

Next, the imaging operation of the in-boring hole imaging apparatus according to the present embodiment will be described. As in the first embodiment, the head unit 2 is inserted into the boring hole 50 with the head unit 2 at the head, and the extension unit 9 through the cable 8 is sequentially connected according to the required insertion depth.
To the desired depth position.

When turbid water accumulates in the boring hole 50 with the head portion 2 reaching a desired depth position, two partitions are used to make the space between the head portion 2 and the inner wall of the boring hole 50 transparent. The body 4 is expanded and the boring hole 50 is formed.
The head part 2 which is brought into close contact with the inner wall and is sandwiched between two partition bodies 4
And the area between the borehole 50 and the inner wall of the borehole 50 is watertightly isolated from other parts. Thereafter, fresh water is supplied from the fresh water supply means 6 to the isolated area between the head section 2 and the inner wall of the boring hole 50, and simultaneously the turbid water is sucked and discharged from the isolated area by the turbid water discharge means 7, so that the head section 2 The isolation region between the inner walls of the borehole 50 is filled with clear water to make it transparent.

When the inner wall of the boring hole 50 can be imaged by the transparency, the camera unit 3 is rotated to orient the imaging direction of the camera 11 in a desired direction, and the camera 11 is adjusted to an appropriate focal length. The camera 11 captures an image of the inner wall of the boring hole 50. An image of the inner wall of the boring hole 50 that is reflected by the reflecting mirror 12 and captured by the camera 11 is output as an image signal, reaches the outside via the cable 8, and allows the observer to observe the state of the inner wall of the boring hole 50.

When the imaging of the first desired position is completed, the camera unit 3 is moved in the head unit 2 in any of the axial directions of the cylinder of the head unit, and the imaging is performed after adjusting the focal length in the same manner as described above.
When the imaging of the inner wall of the boring hole 50 within the range in which the camera unit 3 can move within the head unit 2 is completed, the partition 4
The compressed air inside is sucked and discharged by the partition body control means 5 to separate the partition body 4 from the inner wall of the boring hole 50, and the head unit 2 is moved to a position where the next imaging is performed. After the movement of the head unit 2, the partition body 4 may be brought into close contact with the inner wall of the boring hole 50 in the same manner as described above, and the subsequent operations may be repeated.

As described above, in the imaging apparatus in a borehole according to the present embodiment, the camera unit 3 is disposed within the head unit 2 so as to be movable in the axial direction of the head unit 2 and the camera unit is fixed even when the head unit 2 is fixed. 3, the imaging position can be changed, and the inner wall of the boring hole 50 can be imaged over a predetermined range. Therefore, each time the imaging position slightly changes, the partition body 4 is contracted, and the entire head portion 2 is moved to the imaging position. This eliminates the need to inflate and perform imaging by injecting fresh water and discharging turbid water, greatly shortening the imaging time, and is excellent in handleability and workability.

In the borehole imaging apparatus according to each of the first and second embodiments, the compressed air is used as the fluid to be taken in and out of the partition 4 by the partition control means 5. Not limited to this, the partition body 4 is provided with water as a predetermined fluid in and out thereof,
As the partition body control means 5, the fresh water supply means 6 supplies fresh water of a predetermined pressure also to the inside of each partition body 4, and the turbid water discharge means 7 sucks water also from the inside of each partition body 4. In this case, the system for supplying and discharging the fluid to the inside of the head unit 2 can be limited to the water system, and the structure can be simplified, and the size of the head unit 2 can be further reduced.

In the borehole imaging apparatus according to each of the first and second embodiments, the head portion 2 and the extension casing 9 are formed in a cylindrical shape. Cylindrical body, for example, triangular cross section,
It may be configured as a cylinder having a square cross section, an arbitrary polygon cross section, an elliptical cross section, or the like.

Further, in the in-boring hole imaging apparatus according to each of the first and second embodiments, the configuration is applied to the boring hole 50 in a substantially vertical direction. However, the present invention is not limited to this. Boring holes 50 in each direction including
In the same manner as described above, an image of the inner wall of the boring hole 50 can be taken.

[0039]

As described above, according to the present invention, there is provided a head portion having a built-in camera portion capable of picking up an image of the inner wall of a boring hole, and scalable partitions are arranged at two predetermined positions of the head portion. At the same time, fresh water supply means and turbid water discharge means are connected to a predetermined position on the outer periphery of the head portion sandwiched between the two partition bodies, the head section is inserted into the boring hole, and the head section is expanded by the expansion of the partition body. By separating fresh water and discharging turbid water in a predetermined area around the isolated head section, the inside of the boring hole of the imaging target portion of the camera section can be reliably made transparent, and the camera section can be separated. Thus, a clear image of the inner wall of the borehole can be obtained, and even when turbid water is accumulated in the borehole, imaging of the inner wall of the bore can be performed, and the effect of high convenience can be obtained. Also, by filling a predetermined area around the head portion closed by the partition body with fresh water, the inner pressure of the bored hole is protected by the internal pressure of the filled fresh water, preventing collapse of the inner wall and preventing roughening of the inner wall due to excavation. This is advantageous in that it is easy to grasp and evaluate the images obtained by the camera unit.

Further, according to the present invention, the camera section is arranged in the head section so as to be movable in the axial direction of the head section cylinder, and the camera section can be moved in any of the axial directions of the head section cylinder to change the imaging position. Even when the partition body is already in close contact with the boring hole and the head unit cannot be moved, the boring hole can be imaged over a predetermined range, and the imaging target in the head unit fixed state becomes wider, and the imaging position slightly changes. Each time, the partition body is shrunk and the whole head is moved to the imaging position, and the partition body is expanded again. This has the effect of greatly improving.

Further, according to the present invention, the boring hole communicating position of the fresh water supply means is disposed closer to the partition member far from the head end on the outer periphery of the head portion, and the boring hole communicating position of the turbid water discharging means is provided. Is disposed on the outer periphery of the head portion closer to the partition member from the tip of the head portion, and moves the movement direction of the clean water and the turbid water in the region between the head portion and the inner wall of the boring hole sandwiched between the two partition members. By making the flow of fresh water and turbid water uniform both as the head tip direction,
The flow states of the fresh water and the turbid water are simplified, and both are hardly mixed, and the turbid water can be smoothly replaced with the fresh water. Furthermore, when the direction of the boring hole is downward with respect to the surface of the earth, the turbid matter in the turbid water, which has a higher specific gravity than water, can be discharged more smoothly because the fresh water supply side is upward and the turbid water suction side is downward. This has the effect that transparency can be achieved in time.

Further, according to the present invention, compressed air is used as a fluid flowing into and out of the partition body, and compressed air is supplied or sucked into the interior of the partition body to make the partition body expandable and contractable. Is performed smoothly and in a short time, and it is possible to shift from the moving state of the head unit to the image-capable state in a shorter time.

Further, according to the present invention, fresh water supply means and turbid water discharge means are diverted as partition body control means, and water is supplied or sucked into the interior of the partition body to make the partition body expandable and contractable. Since only the water system can be used for supplying and discharging the fluid to the inside of the head, the structure is simplified and the head can be further downsized.

Further, according to the present invention, the camera section includes the image pickup means, the reflection means, and the illumination means, and reflects the inner wall of the borehole illuminated by the illumination means to the reflection means and picks up an image with the image pickup means. However, the orientation of the imaging means can be arranged so that the camera section can be configured to be the smallest regardless of the actual imaging direction, so that the head section can be further reduced in size, and the head section can be inserted into a small boring hole. This has the effect that imaging can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an imaging device in a borehole according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a head section of the in-boring hole imaging apparatus according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a head portion of an imaging device in a borehole according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a conventional borehole imaging device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Imaging device in a boring hole 2 Head part 2a Window part 3 Camera part 4 Partition body 5 Partition body control means 6 Fresh water supply means 7 Cloudy water discharge means 8 Cable 9 Extension casing 10 Cylindrical body 11 Camera 12 Reflector 13 Illumination lamp 40 Ground Reference Signs List 50 boring hole 100 boring hole imaging device 101 camera sonde 102 cable 103 control unit 104 elevator 105 TV monitor 106 depth measuring device 110 cylinder 111 camera 112 plane reflecting mirror 113 glass window 114 light bulb 115 compass

Claims (6)

[Claims] 1. A boring hole imaging device for moving and rotating a camera unit inserted into a boring hole in the ground in the boring hole to image a boring hole inner wall, wherein at least one end is closed and at least a part of an outer peripheral wall is provided. Is formed of a substantially cylindrical body having a predetermined length capable of transmitting light, and has a built-in camera portion, a head portion inserted with a closed end end as a tip so as to be able to be inserted into and removed from a boring hole; It is formed of a tube body that can be expanded and contracted by taking in and out the fluid, and is disposed so as to surround the outer periphery of the head portion at two predetermined positions separated by a predetermined distance in the axial direction of the head portion cylinder with respect to the camera unit built-in position of the head portion, Two partition bodies that can expand and adhere to the inner wall of the boring hole in a watertight state without any gaps, and are connected to the respective partition bodies on the outer periphery of the head part from outside the boring hole, and Partitioning body control means for supplying a fluid at a predetermined pressure or sucking the fluid; fresh water supply means connected to a predetermined position on the outer periphery of a head portion sandwiched between the two partitioning bodies from outside the boring hole to supply fresh water; A turbid water discharging means connected to a predetermined position on the outer periphery of the head portion sandwiched between the two partition bodies from outside and for sucking water and turbid matter, and an image of the head portion inserted into the boring hole captured by the camera portion In a state where the partitioning member is located at the target position, the two partitioning members are inflated by the partitioning member control means so as to be in close contact with the inner wall of the boring hole, and the region between the head portion and the inner wall of the boring hole sandwiched between the two partitioning members is removed. Isolate water-tight from other parts, supply fresh water from the fresh water supply means, and at the same time suck and discharge the turbid water by the turbid water discharge means, fill the gap between the head and the inner wall of the borehole with clear water and make it transparent. , Boring downhole imaging apparatus characterized by imaging the borehole inner wall through the light transmissive portion of the with the fresh water portion head portion in the camera unit. 2. The imaging apparatus according to claim 1, wherein the camera section is disposed so as to be movable within a predetermined range in the axial direction of the cylinder of the head. . 3. The imaging device in a borehole according to claim 1, wherein the fresh water supply means is located farther from a head end of an outer periphery of the head portion sandwiched between the two partition members. The turbid water discharge means communicates with the boring hole side at a predetermined position closer to the boring hole, and the turbid water discharge means is disposed at a predetermined position closer to the partition body near the head end of the outer periphery of the head portion sandwiched between the two partition bodies. An imaging device in a boring hole characterized by communicating with a side. 4. The imaging apparatus according to claim 1, wherein the partition body control means supplies and sucks compressed air as a predetermined fluid into the partition body. Characteristic imaging device in borehole. 5. The imaging device in a borehole according to claim 1, wherein water as a predetermined fluid is taken in and out of the partition, and the fresh water supply is performed as the partition control means. A means for supplying fresh water at a predetermined pressure to each partition body, and said turbid water discharge means sucks water from each partition body as well. 6. The imaging device in a borehole according to claim 1, wherein the camera unit includes an imaging unit in a cylindrical body whose outer peripheral portion is made of a transparent material, and an image of the imaging unit. A reflecting means which is arranged at a predetermined angle on the extension of the central axis and which enables the imaging means to image the inner wall of the boring hole through the light transmitting portion of the cylindrical body and the head part; and light of the cylindrical body and the head part. An in-boring-hole imaging device, which is formed by integrally storing illumination means for irradiating illumination light toward an inner wall of a boring hole to be imaged through a transmission portion.