JP3961698B2 - Boring hole imaging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-boring hole imaging device for imaging and observing a state of an inner wall of a boring hole.
[0002]
[Prior art]
Conventionally, when observing the state of a hole wall in a hole drilled for geology or ground investigation, if the hole drilled is oriented approximately perpendicular to the ground, it is suspended from the ground surface into the hole. Then, an in-boring hole imaging device (borehole camera device) that images the inner wall of the hole has been used.
[0003]
As such conventional borehole imaging devices, those disclosed in Japanese Patent Application Laid-Open Nos. 1-210594 and 6-311401 are known, and an example of such a borehole imaging device is shown in FIG. Shown in FIG. 7 is a schematic configuration diagram of a conventional borehole imaging apparatus.
[0004]
The conventional borehole imaging device 100 shown in the previous figure includes a camera sonde 101 inserted into the borehole 50, an elevator 104 for raising and lowering the camerasonde 101 in the borehole 50, and a borehole of the camerasonde 101. 50, a depth measuring device 106 that measures the depth within 50, a control unit 103 that controls the camera sonde 101 and the elevator 104, and processes an image signal from the camera sonde 101, depth data from the depth measuring device 106, and the like. The configuration includes a television monitor 105 that displays an image signal processed by the unit 103, and a system cable 102 that connects these devices to exchange signals and supply power.
[0005]
The camera sonde 101 includes a camera 111 housed in a cylindrical tube 110, a plane reflecting mirror 112 disposed at an inclination of 45 degrees on the optical axis of the camera 111, and a cylinder attached to the tube 110. The glass window 113 and a light bulb 114 that irradiates the outside of the glass window 113 are provided. The camera sonde 101 is configured to be rotatable around the axis of the boring hole 50 by a driving means (not shown), and the direction taken by the camera 111 is detected by the azimuth measuring device 115. .
[0006]
In the conventional borehole imaging device having the above-described configuration, the camera sonde 101 is inserted into the borehole 50, and the depth measuring device 106 detects the depth in the borehole 50, while the elevator 104 places the desired depth position. The hole wall surface S at a desired position is photographed by irradiating the inside of the boring hole 50 with the light bulb 114 while moving it and detecting the azimuth at that position with the azimuth measuring device 115 and directing it in the desired photographing direction by the driving means. Can do. The obtained image signal of the inner wall of the boring hole 50 is sent to the control unit 103 for processing and displayed on the television monitor 105. By monitoring the display image of the television monitor 105, the geology of the point where the bored hole 50 is drilled can be grasped.
[0007]
In addition to the conventional borehole imaging device described above, a device is also used in which a camera is provided at the tip of the rod inserted into the borehole from the ground surface to image the borehole. As such conventional borehole imaging devices, those disclosed in JP-A-6-74764 and JP-A-6-94452 are known, and an example of such a borehole imaging device is shown in FIG. Shown in FIG. 8 is a schematic configuration diagram of another conventional borehole imaging apparatus.
[0008]
In the conventional borehole imaging device shown in the previous figure, the camera 203 is housed in a cylindrical case 202 that forms a head portion 201 inserted into the borehole, and a bottomless frustoconical inner surface is formed on the front end surface of the case 202. A mirror 204 is attached. An acrylic window 205 is formed in the front part of the inner mirror 204, and an illumination lamp 206 and a diffused illumination window 207 are disposed outside the acrylic window 205.
[0009]
The case 202 includes an inner case 202 a that houses the camera 203 and the like, and an outer case 202 b that is externally fitted thereto. The outer case 202 b is connected and fixed to the U-shaped rod 209 via an offset ring 208.
[0010]
The imaging data of the camera 203 is transmitted to the cable 211 via the connector 210 and input to the recording means and the image processing means (not shown), and the image processed by the image processing means is displayed on the monitor (not shown). It is a mechanism to be done.
[0011]
Imaging with the conventional borehole imaging device having the above-described configuration is performed by first inserting the head unit 201 into the borehole so that the optical axis of the camera 203 is parallel to the borehole axis direction, and then imaging with the camera 203. I do. An image obtained by combining the side-view image captured by the camera 203 with the inner mirror 204 and the forward-view image directly captured by the camera 203 is input to the image processing means, processed into an appropriate image, and displayed on the monitor. Is done. An observer observes the state of the inner wall of the borehole displayed on the monitor.
[0012]
As described above, in the other conventional borehole imaging device described above, the side view image reflected on the inner mirror 204 and the forward view image directly captured can be simultaneously captured by the single camera 203. In addition, it is possible to quickly grasp the entire condition of the borehole inner wall surface and the condition of spring water.
[0013]
[Problems to be solved by the invention]
Since the conventional borehole imaging device is configured as described above, in the former case, there was no problem when it was used for a vertical hole. The problem is that it is very difficult to confirm the state of the inner wall of such a substantially horizontal boring hole.
[0014]
In the latter case, it could be inserted in a substantially horizontal direction, but the length of the U-shaped rod 209 was limited and could not be used for deep holes. In addition, since the indentation resistance is large due to friction between the inner wall of the boring hole and the head portion 201 and a large driving force is required for insertion into the hole, a powerful insertion driving machine must be used, which increases the cost. It had a problem of end up.
[0015]
The present invention has been made to solve the above-mentioned problems, and can image the inner wall of a borehole in any direction of the ground, has no depth limitation, and in any direction of the deep borehole. An object of the present invention is to provide a borehole imaging device capable of reliably imaging an inner wall.
[0016]
[Means for Solving the Problems]
In the borehole imaging device according to the present invention, 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, and the borehole of the ground is formed with the closed end side as a tip. A head portion that is inserted into and removed from the hole and is rotatably inserted, an image pickup means that is stored inside the head portion, and an image pickup center axis extension of the image pickup means inside the head portion, and is inclined at a predetermined angle. A reflecting means that enables the imaging means to image the inner wall of the borehole through the light transmitting portion of the head portion; and an inner surface of the head portion that is disposed toward the inner wall of the borehole to be imaged via the light transmitting portion. Illuminating means for irradiating illumination light, and a substantially cylindrical body having both ends open, and one of the open ends is connected to the open end of the head portion and inserted into the boring hole. Insertion An extension casing is extended is plural spliced in series by connecting the open ends between with increasing depth,
A cable for transmitting an imaging signal and supplying power, connected to the imaging means in the head portion through the extension casing from the outside of the boring hole, The one or more extension casings have sufficient torsional rigidity capable of changing the direction of the head portion with respect to the borehole inner wall from the outside of the borehole, The head portion inserted into the boring hole is moved and rotated in the boring hole to image the inner wall of the boring hole. As described above, in the present invention, when the head portion containing the imaging means capable of imaging the outside is inserted into the borehole while the extension casing is added, the imaging means can be sent deep inside the borehole, and the imaging means Therefore, a clear image of the inner wall of the borehole can be obtained, and the inner wall of the borehole can be imaged for any borehole, which is highly convenient.
[0017]
Also , Since the long casing has sufficient torsional rigidity, the orientation of the head portion can be adjusted in the bore hole by rotating the extension casing from the outside of the hole, and an image of the desired inner wall position can be obtained with the imaging means reliably. Become.
[0018]
Moreover, in the borehole imaging device according to the present invention, the head portion includes a wiping means for keeping the light transmitting portion clean as necessary. As described above, in the present invention, the wiping means is disposed in the head portion, and when the light transmission part is soiled, the wiping means can remove the dirt, so that the imaging means can maintain the transparency of the light transmission part. A clear image can always be captured.
[0019]
Further, in the borehole imaging device according to the present invention, if necessary, the outer peripheral portion of the head portion in a predetermined position is rotatably engaged with the outermost peripheral portion contacting the inner wall of the borehole and the innermost peripheral portion. In addition, the head portion bearing body is provided which is composed of an inner peripheral portion integrally provided with the head portion and holds the head portion rotatably with respect to the inner wall of the boring hole. As described above, in the present invention, the head portion bearing body including the outermost peripheral portion and the inner peripheral portion is interposed between the head portion and the inner wall of the borehole, and the head portion does not directly contact the borehole with the head portion bearing body. When the head part is rotated with respect to the inner wall of the boring hole while supporting in the state, the inner peripheral part integral with the head part can smoothly rotate with respect to the outermost peripheral part in contact with the inner wall of the boring hole. The resistance during the rotation of the bore is reduced, the head can be easily rotated relative to the inner wall of the borehole, and the position of the head can be adjusted from the outside of the borehole more easily and with a small driving force, improving workability. And cost reduction.
[0020]
Also, the imaging device in the borehole according to the present invention is formed as a substantially cylindrical body into which the head portion and the extension casing can be inserted, if necessary, and is disposed at a ground surface side entrance portion of the borehole, An inlet holding portion that covers the inlet portion so as not to collapse, and is disposed inside the inlet holding portion and is rotatably engaged with the outermost peripheral portion contacting the inner wall of the inlet holding portion and the innermost outer peripheral portion. And an inlet bearing body comprising an inner peripheral portion that abuts on the surface of the head portion or the extension casing and holds the head portion or the extension casing so as to be movable and rotatable in the axial direction of the borehole. As described above, in the present invention, the inlet holding portion and the inlet bearing body are arranged at the entrance portion on the ground surface side of the borehole, and the head portion or the extension casing is supported by the inlet bearing body in a state where it is not in direct contact with the inlet holding portion. When the head portion or the extension casing is rotated with respect to the inner wall of the boring hole, the head portion or the extension casing can smoothly rotate with respect to the inner peripheral portion held on the inlet holding portion side. The resistance during the rotation of the bore is reduced, the head can be easily rotated relative to the inner wall of the borehole, and the position of the head can be adjusted from the outside of the borehole more easily and with a small driving force, improving workability. And cost reduction. Further, by covering and holding the ground surface side entrance portion of the borehole, the entrance portion, which is the weakest portion of the ground, is prevented from collapsing, and the head portion or the extension casing can be inserted into and removed from the borehole and rotated without delay.
[0021]
Further, the imaging device in the borehole according to the present invention is formed of a substantially cylindrical body into which the head portion and the extension casing can be inserted, if necessary, and is disposed at the ground side entrance portion of the borehole, An angle scale indicating the orientation of the head portion is formed on the surface, and an inlet holding portion that covers the inlet portion and holds it so as not to collapse is provided. As described above, in the present invention, the entrance holding portion is disposed at the ground-side entrance portion of the borehole, and the entrance-portion that becomes the weakest portion of the ground is collapsed by covering and holding the ground-side entrance portion of the borehole. In this way, the head part or the extension casing can be taken in and out of the boring hole and rotated smoothly. Furthermore, an angle scale is formed on the surface on the ground surface side of the inlet holding portion, and by knowing the rotation angle of the head portion or the extension casing, the orientation of the head portion with respect to the inner wall of the borehole can be easily grasped, and from the outside of the borehole. The position of the head can be adjusted more easily, and workability can be improved.
[0022]
Further, the borehole imaging device according to the present invention is formed by forming an angle scale indicating the orientation of the head portion on the ground surface side surface of the entrance holding portion as necessary. Thus, in the present invention, an angle scale is formed on the surface on the ground surface side of the inlet holding portion, and the orientation of the head portion with respect to the inner wall of the borehole can be easily grasped by knowing the rotation angle of the head portion or the extension casing. The position of the head portion can be adjusted more easily from the outside of the boring hole, and workability can be improved.
[0023]
Also, in the borehole imaging device according to the present invention, the extension casing surrounds a series of slit-shaped openings that can be inserted into a cable that is connected to both open ends and connected to the imaging means. It is formed on the side. Thus, in the present invention, the extension casing is formed with an opening communicating with both open ends, and the cable connected to the imaging means of the head is passed through the opening and stored inside the extension casing. It is easy to pass through the extension casing, and the cable can be stored in the extension casing from the opening just before the extension casing is added, and all the extension casings that are added as the insertion into the boring hole progresses from the beginning. It will not be necessary to pass through the cable, the handleability of the cable and the extension casing is excellent, and the workability is greatly improved.
[0024]
The borehole imaging device according to the present invention includes a spacer that is formed as a substantially linear body that can be freely attached to and detached from the opening of the extension casing as needed, and that watertightly closes the opening of the extension casing. is there. As described above, in the present invention, the spacer is attached to the opening of the extension casing that stores the cable, and the opening of the extension casing that stores the cable is watertightly closed, so that the spring water and the like can be removed from the opening after the boring hole is inserted. There is no intrusion into the extension casing, and water does not adversely affect the head unit and each device inside the extension casing.
[0025]
The borehole imaging device according to the present invention is provided with an imaging direction measuring means for measuring the orientation of the head portion with respect to the borehole inner wall, if necessary, and is obtained by the imaging direction measuring means. The obtained imaging direction information is displayed on a part of the imaging screen obtained by the imaging means. As described above, in the present invention, the imaging direction measuring means is provided in the head portion, and the orientation of the head portion with respect to the inner wall of the borehole, that is, imaging is displayed by displaying the imaging direction information superimposed on the screen obtained by imaging. The direction can be easily grasped, and it is possible to reliably determine which position of the actual boring hole the screen imaged from the inner wall of the boring hole is.
[0026]
Further, in the borehole imaging device according to the present invention, the imaging direction measuring means is formed so that the imaging direction information can be displayed on the imaging direction measuring means itself, if necessary, and the inside of the head portion that can be imaged by the imaging means. Are disposed at predetermined positions. As described above, in the present invention, the imaging direction measuring unit itself is formed so as to be able to display the imaging direction information and is directly imaged by the imaging unit, and the imaging direction information can be displayed on the imaging screen of the inner wall of the borehole. The image capturing direction can be easily grasped, the screen that captured the inner wall of the boring hole and the actual boring hole can be made to correspond one-on-one, and complicated image processing that adds image capturing direction information is not required, and a simple configuration Can reduce costs.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment of the present invention)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a schematic configuration diagram of an imaging device in a borehole according to the present embodiment, FIG. 2 is a sectional view of a head portion of the imaging device in a borehole according to the present embodiment, and FIG. 3 is an imaging in a borehole according to the present embodiment. It is sectional drawing and front view of the inlet holding part of an apparatus.
[0028]
As shown in the drawings, the borehole imaging device 1 according to the present embodiment has a metal substantially cylindrical shape with a predetermined length having a window portion 2a which is closed at one end and opened at a part of the outer peripheral wall. A head unit 2 formed of a body and having a closed end side as a front end and inserted into the boring hole 50 of the ground 40 so as to be able to be put in and out and rotated, and a camera as an imaging means stored inside the head unit 2 3 and reflecting means that is inclined by 45 ° on the extension of the imaging center axis of the camera 3 inside the head portion 2 and enables the camera 3 to image the inner wall of the borehole 50 through the window portion 2a of the head portion 2. A flat reflecting mirror 4 as an illumination lamp 5 as an illuminating means disposed inside the head portion 2 and irradiating illumination light toward the inner wall of the borehole 50 to be imaged through the window portion 2a; Abbreviated open at both ends One of the open ends is connected to the open end of the head portion 2 and inserted into the boring hole 50, and the open ends are connected in series as the depth of insertion into the boring hole 50 increases. A plurality of extension casings 6 that are extended to each other, and a cable 7 that is connected to the camera 3 in the head portion 2 through the extension casing 6 from the outside of the boring hole 50 and performs imaging signal transmission and power supply. It is the composition provided.
[0029]
The head portion 2 is engaged with the outermost peripheral portion 8a formed of a sphere that contacts the inner wall of the boring hole 50, and the outermost peripheral portion 8a so as to be rotatable, and is disposed integrally with the head portion 2. A head portion bearing body 8 having an inner peripheral portion 8b of an annular body is disposed at a predetermined position on the outer periphery, and is rotatably held by the head portion bearing body 8 with respect to the inner wall of the borehole 50.
[0030]
A drive source (not shown) such as a motor is mounted on the camera 3 inside the head unit 2 and the focal length can be adjusted by driving the drive source. Further, a cable 7 is connected to the camera 3 to exchange image signals of the camera 3 and supply power. A control unit, a television monitor (not shown), and the like are connected to the opposite end of the cable 7. These configurations and operations are the same as those of the former device described above. The camera 3, the plane reflecting mirror 4, and the illumination lamp 5 are integrally stored in a camera storage portion 2 b whose outer peripheral portion is a cylindrical body made of a transparent material, and can be separated from the head portion 2.
[0031]
The extension casing 6 is a substantially cylindrical body made of metal, synthetic resin, or the like, and the open ends of the substantially cylindrical body are formed so as to be detachable and connectable while maintaining waterproof and airtightness. One open end is structured to be detachably attachable to the head portion 2 in a waterproof and airtight state.
[0032]
On the other hand, at the ground side entrance portion of the boring hole 50 serving as an insertion port for the head portion 2 and the extension casing 6, a substantially cylindrical body capable of inserting the head portion 2 and the extension casing 6 into the inside is formed. An angle scale 9a indicating the orientation of the head portion 2 is formed on the surface of the ground surface, and an inlet holding portion 9 that covers the ground-side inlet portion of the boring hole 50 is disposed. The outermost peripheral portion 10a of the substantially annular body that contacts the inner wall of the outer peripheral portion of the outer peripheral portion 10a and the innermost outermost peripheral portion 10a is rotatably engaged with the inner peripheral portion 10a. An inlet bearing body 10 including a spherical inner peripheral portion 10b that is held so as to be axially movable and rotatable is provided. Since the entrance holding portion 9 covers and holds the surface side entrance portion of the boring hole 50, the entrance portion that becomes the weakest portion of the ground is prevented from collapsing, and the head portion 2 or the extension casing 6 is put in and out of the boring hole 50. And rotation can be performed without delay.
[0033]
The angle scale 9 a of the inlet holding portion 9 indicates which direction of the inner wall of the boring hole 50 is opposed to the camera 3 through the plane reflecting mirror 4, and the rotation of the head portion 2 or the extension casing 6. Since the angle is known, the orientation of the head part 2 with respect to the inner wall of the boring hole 50 can be easily grasped, and the position adjustment of the head part 2 from the outside of the boring hole 50 can be performed more easily.
[0034]
Further, the head portion 2 and the extension casing 6 are inserted into and removed from the borehole 50 and rotated with respect to the borehole 50 and the head portion 2 reaches the entrance portion on the ground surface side of the borehole 50. Depth measuring devices (not shown) for detecting the depth from the insertion state of the head portion 2 and the extension casing 6 are provided.
Next, the imaging operation of the borehole imaging device according to the present embodiment will be described.
[0035]
In advance, cables 7 are passed through all the extension casings 6 that are connected and used to the depth to be inserted. Then, the head portion 2 is inserted into the boring hole 50 so that the optical axis of the camera 3 is parallel to the axial direction of the boring hole 50, and the extension casing 6 is sequentially connected according to the required insertion depth. However, it inserts to a desired depth position with a drive device (illustration omitted), and detects the depth in the boring hole 50 of the head part 2 with a depth measuring device (illustration omitted). While grasping the imaging direction of the camera 3 at the depth position with the angle scale 9a, the head unit 2 and the extension casing 6 are rotated by the driving device so that the imaging direction of the camera 3 is directed to a desired direction, and further inside the head unit 2 The camera 3 is adjusted to an appropriate focal length by driving with the driving source, and the inner wall of the boring hole 50 at a desired position is imaged by the camera 3 while irradiating the boring hole 50 with the illumination lamp 5. An image of the inner wall of the boring hole 50 reflected on the reflecting mirror 4 and imaged by the camera 3 is output as an imaging signal, input to a control unit (not shown) via the cable 7, appropriately image-processed, and a television monitor ( (Not shown). An observer observes the state of the inner wall of the borehole 50 displayed on the television monitor.
[0036]
As described above, in the in-boring hole imaging device according to the present embodiment, the head portion 2 incorporating the camera 3 is inserted into the boring hole 50 while the extension casing 6 is being added, so that the deep inside of the boring hole 50 is obtained. The camera 3 can be fed in, and the extension casing 6 is rotated from the outside of the hole to adjust the direction of the head portion 2 in the boring hole 50, and a clear image of the desired position of the inner wall of the boring hole 50 can be reliably obtained from the camera 3. In other words, the inner wall of any hole can be imaged for any borehole 50, which is highly convenient. Further, the head portion bearing body 8 is disposed between the head portion 2 and the inner wall of the boring hole 50, and the inlet bearing body 10 is disposed at the entrance portion on the ground surface side of the boring hole 50. 6 is supported in a state where it is not in direct contact with the boring hole 50, and the resistance during rotation between the head portion 2 or the extension casing 6 and the inner wall of the boring hole 50 is reduced. On the other hand, since it can be easily rotated, the position of the head portion 2 can be easily adjusted from the outside of the boring hole 50 with a small driving force, so that the workability can be improved and the cost can be reduced.
[0037]
(Second embodiment of the present invention)
A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a schematic configuration explanatory diagram of an extension casing of the imaging device in the borehole according to this embodiment, and FIG. 5 is an explanatory diagram of a main configuration of the extension casing of the imaging device in the borehole according to the present embodiment.
[0038]
The imaging device 1 in the borehole in the present embodiment includes a head unit 2, a camera 3, a plane reflecting mirror 4, an illumination lamp 5, an extension casing 6, and a cable 7 as in the first embodiment. On the other hand, as a part different from the first embodiment, as shown in FIG. 4, the extension casing 6 communicates with both open ends and a series of slit shapes into which a cable 7 connected to the camera 3 can be inserted. The opening 6a is formed on the peripheral side, and the opening 6a of the extension casing 6 is formed of a substantially linear body that is detachable, and includes a spacer 11 that watertightly closes the opening 6a. It is.
[0039]
The extension casing 6 is formed with a slit-like opening 6a communicating with both open ends, and has a fitting projection 6c and a fixing screw 6d on the outer periphery as both open ends that are detachable. A male end 6b, a holding groove 6f for fitting the fitting projection 6c, and a fixing hole for inserting the fixing screw 6d are formed so that the male end 6b can be fitted and removed at the opposite end of the male end 6b. 6g is a structure provided with the female end part 6e formed in an inner-periphery penetration state, respectively. The extension casing 6 is connected by inserting the male end 6b into the female end 6e so that the fitting projection 6c fits the holding groove 6f, and the male end 6b until the fitting projection 6c reaches the back of the holding groove 6f. After the side is rotated with respect to the female end portion 6e side, the fixing screw 6d is screwed and protruded to the outer peripheral side, and is inserted into the fixing hole 6g, so that it is surely integrated.
Next, the imaging operation of the borehole imaging device according to the present embodiment will be described.
[0040]
Unlike the first embodiment, it is not necessary to pass the cables 7 through all of the extension casings 6 in advance, and after the head portion 2 is inserted into the boring hole 50, the extension casings 6 are sequentially connected according to the required insertion depth. Before insertion, the cable 7 is passed through the opening 6 a of the extension casing 6 and the opening 6 a is closed with the spacer 11.
[0041]
After that, as in the first embodiment, the head unit 2 and the extension casing 6 are inserted to a desired depth position by the driving device, and the focal length of the camera 3 is adjusted by directing the head unit 2 in a desired direction, thereby illuminating. The inner wall of the borehole 50 is imaged. The imaged image of the inner wall of the borehole 50 is output as an imaging signal, input to the control unit via the cable 7, processed into an appropriate image, and displayed on the television monitor.
[0042]
As described above, in the borehole imaging device according to the present embodiment, the opening 6a that communicates with both open ends is formed in the extension casing 6, and the cable 7 that is connected to the camera 3 in the head portion 2 is connected to the opening 6a. Since the cable 7 can be stored inside the extension casing 6 through the cable, the operation of passing the cable 7 through the extension casing 6 is facilitated, and the cable 7 is opened from one end of the extension casing 6 to all of the plurality of extension casings 6 to be joined. It is not necessary to pass through from the end to the other, the handleability of the extension casing 6 and the cable 7 is excellent, and the workability is greatly improved. In addition, since the spacer 11 is attached to the opening 6a of the extension casing 6 and the opening 6a after the cable is stored is watertightly closed, spring water or the like enters the extension casing 6 from the opening 6a after the boring 50 hole is inserted. There is no intrusion, and water does not adversely affect the devices inside the head portion 2 and the extension casing 6.
[0043]
(Third embodiment of the present invention)
A third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of the head portion of the imaging device in the borehole according to this embodiment.
[0044]
The imaging device 1 in the borehole in the present embodiment includes a head unit 2, a camera 3, a plane reflecting mirror 4, an illumination lamp 5, an extension casing 6, and a cable 7 as in the first embodiment. On the other hand, as a part different from the first embodiment, as shown in FIG. 6, the planar reflecting mirror 4 inside the head unit 2 is arranged shifted from the extension of the imaging center axis of the camera 3 and the imaging center of the camera 3 is arranged. The half mirror 12 is disposed at a predetermined angle on the axial extension, and the inner wall of the borehole 50 can be imaged by the camera 3 through the window portion 2a of the head portion 2 by the plane reflecting mirror 4 and the half mirror 12. A compass 13 as an imaging direction measuring unit is disposed in the head portion 2 on the tip side of the half mirror 12, and the azimuth display state of the compass 13 is changed through the half mirror 12. And it has a structure that allows imaging in camera 3.
[0045]
Next, the imaging operation of the borehole imaging device according to the present embodiment will be described.
As in the first embodiment, the head portion 2 is inserted to the desired depth position while the extension casing 6 is sequentially connected to the head, and the focal length of the camera 3 is adjusted with the head portion 2 directed in the desired direction. Then, the inner wall of the borehole 50 is imaged with illumination. At this time, the compass 13 displaying the azimuth is also imaged by the camera 3 through the half mirror 12 only in the azimuth display portion by illumination from the illumination unit 14.
[0046]
The image of the inner wall of the borehole 50 reflected on the reflecting mirror 4 and further reflected on the half mirror 12 and picked up by the camera 3 is output as an image pickup signal in a state in which the azimuth display part of the compass 13 is also taken in part. The image is processed and displayed on a television monitor (not shown). A part of the screen of the inner wall of the borehole 50 displayed on the television monitor includes the orientation display portion of the compass 13 so that the observer can surely grasp the orientation of the borehole 50 along with the state of the inner wall of the borehole 50. .
[0047]
As described above, in the in-boring hole imaging device according to the present embodiment, the compass 13 is disposed in the head portion 2, and the orientation display state of the compass 13 is partially displayed on the inner wall image of the boring hole 50 captured by the camera 3. Since the image is superimposed and displayed, the imaging direction of the inner wall of the borehole 50 by the camera 3 can be easily grasped, and the position of the actual borehole 50 where the screen imaged of the inner wall of the borehole 50 can be surely determined. It is possible to more appropriately evaluate the borehole 50 based on the screen.
[0048]
In the borehole imaging device according to each of the first to third embodiments, when the head portion 2 is used for a long time, the contact with the inner wall of the borehole 50 is repeated, so that the soil is removed from the window portion 2a. In addition to the above-described structure, the wiper as a wiping means for wiping the outer peripheral portion may be provided in the head storage part 2b. In addition, the transparency can be easily recovered by wiping the outer peripheral portion, and the captured image of the camera 3 can be prevented from becoming unclear by maintaining the transparency high.
[0049]
In the borehole imaging device according to each of the first to third embodiments, the head portion 2 and the extension casing 6 are formed in a cylindrical shape. It is good also as a structure made into cylinders, such as a body, for example, a triangular cross section, a square cross section, arbitrary polygonal cross sections, an elliptical cross section.
[0050]
Further, in the borehole imaging device according to each of the first to third embodiments, the configuration is applied to the borehole 50 in a substantially horizontal direction or a substantially vertical direction. In each of the first and second embodiments, the inner wall of the borehole 50 is imaged by inserting the borehole 50 in each direction including the vertical direction, and in the third embodiment, the borehole 50 in each direction including the horizontal direction. Can be done.
[0051]
【The invention's effect】
As described above, according to the present invention, the head unit containing the imaging unit capable of imaging the outside is inserted into the boring hole while the extension casing is added, so that the imaging unit can be sent deep inside the boring hole, A clear image of the inner wall of the borehole can be obtained from the image pickup means, and the inner wall of the borehole can be imaged with respect to any borehole, which is highly convenient.
[0052]
In addition, according to the present invention, since the extension casing has sufficient torsional rigidity, the orientation of the head portion can be adjusted in the bore hole by rotating the extension casing from the outside of the hole. The effect is that an image of the position can be obtained.
[0053]
Further, according to the present invention, the wiping means is disposed on the head portion, and when the light transmission part is soiled, the wiping means can remove the dirt, so that the imaging means can maintain the transparency of the light transmission part. It has an effect that a clear image can always be taken.
[0054]
Further, according to the present invention, the head part bearing body composed of the outermost peripheral part and the inner peripheral part is interposed between the head part and the inner wall of the boring hole, and the head part does not directly contact the boring hole by the head part bearing body. When the head part is rotated with respect to the inner wall of the boring hole while supporting in the state, the inner peripheral part integral with the head part can smoothly rotate with respect to the outermost peripheral part in contact with the inner wall of the boring hole. The resistance during the rotation of the bore is reduced, the head can be easily rotated relative to the inner wall of the borehole, and the position of the head can be adjusted from the outside of the borehole more easily and with a small driving force, improving workability. Thus, the cost can be reduced.
[0055]
Further, according to the present invention, the inlet holding portion and the inlet bearing body are disposed at the ground surface side inlet portion of the boring hole, and the head portion or the extension casing is supported by the inlet bearing body without directly contacting the inlet holding portion, When the head portion or the extension casing is rotated with respect to the inner wall of the boring hole, the head portion or the extension casing can smoothly rotate with respect to the inner peripheral portion held on the inlet holding portion side. The resistance during the rotation of the bore is reduced, the head can be easily rotated relative to the inner wall of the borehole, and the position of the head can be adjusted from the outside of the borehole more easily and with a small driving force, improving workability. And cost reduction. Furthermore, by covering and holding the surface side entrance part of the boring hole, it is possible to prevent the entrance part, which is the weakest part of the ground, from collapsing, and to move the head part or extension casing into and out of the boring hole and rotate without delay. Have
[0056]
Further, according to the present invention, the inlet holding portion is disposed at the ground-side entrance portion of the borehole, and the ground-side entrance portion of the borehole is covered and held, whereby the entrance portion that becomes the weakest portion of the ground is collapsed. In this way, the head part or the extension casing can be taken in and out of the boring hole and rotated smoothly. Furthermore, an angle scale is formed on the surface on the ground surface of the inlet holding part, and by knowing the rotation angle of the head part or the extension casing, the orientation of the head part with respect to the inner wall of the boring hole can be easily grasped, and from the outside of the boring hole. The position of the head can be adjusted more easily, and workability can be improved.
[0057]
Further, according to the present invention, an angle scale is formed on the surface on the ground surface side of the inlet holding portion, and the orientation of the head portion with respect to the inner wall of the borehole can be easily grasped by knowing the rotation angle of the head portion or the extension casing. The position adjustment of the head part from the outside of the boring hole can be performed more easily, and the workability can be improved.
[0058]
Further, according to the present invention, the opening is formed in the extension casing so as to communicate with both open ends, and the cable connected to the imaging means of the head is passed through the opening and stored inside the extension casing. It is easy to pass through the extension casing, the cable can be stored in the extension casing from the opening immediately before the extension casing is added, and all the extension casings that are added as the insertion into the boring hole progresses from the beginning. It is not necessary to pass through the cable, and the cable and the extension casing are easy to handle, and the workability is greatly improved.
[0059]
Further, according to the present invention, the spacer is attached to the opening of the extension casing that stores the cable, and the opening of the extension casing that stores the cable is watertightly closed, so that the spring water and the like can be removed from the opening after the boring hole is inserted. There is no intrusion into the extension casing, and there is an effect that the head part and each device inside the extension casing are not adversely affected by water.
[0060]
Further, according to the present invention, the imaging direction measuring means is provided in the head portion, and the orientation of the head portion with respect to the inner wall of the borehole, that is, imaging, is displayed by superimposing the imaging direction information on the screen obtained by imaging. The direction can be easily grasped, and there is an effect that it is possible to reliably determine which position of the actual boring hole the screen imaged from the inner wall of the boring hole is.
[0061]
Further, according to the present invention, the imaging direction measuring means itself is formed so as to be able to display the imaging direction information, is directly imaged by the imaging means, and the imaging direction information can be displayed on the imaging screen of the inner wall of the borehole. The image capturing direction can be easily grasped, the screen where the inner wall of the boring hole is imaged and the actual boring hole can be made to correspond one-on-one, and complicated image processing that adds image capturing direction information is not required, and a simple configuration Thus, the cost can be reduced.
[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 the head portion of the imaging device in the borehole according to the first embodiment of the present invention.
FIG. 3A is a cross-sectional view of an inlet holding portion of the imaging device in a borehole according to the first embodiment of the present invention.
(B) is a front view of the entrance holding part of the imaging device in the borehole according to the first embodiment of the present invention.
FIG. 4A is an explanatory diagram of a cable introduction state of an extension casing of an imaging device in a borehole according to a second embodiment of the present invention.
(B) is a state explanatory drawing before the connection of the extension casing of the imaging device in a borehole which concerns on the 2nd Embodiment of this invention.
FIG. 5A is a schematic configuration diagram of a male end portion of an extension casing of an imaging device in a borehole according to a second embodiment of the present invention.
(B) is a schematic block diagram of the extension casing female end part of the imaging device in a borehole which concerns on the 2nd Embodiment of this invention.
FIG. 6 is a cross-sectional view of a head part of an imaging device in a borehole according to a third embodiment of the present invention.
FIG. 7 is a schematic configuration diagram of a conventional borehole imaging apparatus.
FIG. 8 is a schematic configuration diagram of another conventional borehole imaging apparatus.
[Explanation of symbols]
1 Boring hole imaging device
2 Head
2a Window
2b Camera storage
3 Camera
4 plane reflectors
5 Lighting lamp
6 Extension casing
6a opening
6b Male end
6c Protrusion for fitting
6d fixing screw
6e Female end
6f Holding groove
6g fixing hole
7 Cable
8 Head bearing body
8a outermost part
8b Inner circumference
9 Entrance holder
9a Angle scale
10 Inlet bearing body
10a outermost part
10b Inner circumference
11 Spacer
12 half mirror
13 Compass
14 Illumination
40 ground
50 Boring hole
100 Boring hole imaging device
101 camera sonde
102 System cable
103 Control unit
104 Elevator
105 TV monitor
106 Depth measuring device
110 cylinder
111 cameras
112 Planar reflector
113 Glass window
114 light bulb
115 compass
201 Head
202 cases
202a inner case
202b outer case
203 Camera
204 Internal mirror
205 acrylic window
206 Lighting lamp
207 Lighting window
208 Offset ring
209 U-shaped rod
210 connector
211 cable

Claims (10)

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 that can transmit light, and the closed end is inserted into the ground boring hole so that it can be inserted into and removed from the borehole. A head part,
Imaging means stored inside the head portion;
Reflecting means that is disposed at a predetermined angle on the imaging center axis extension of the imaging means inside the head portion, and that allows the imaging means to image the inner wall of the borehole through the light transmitting portion of the head portion;
Illuminating means disposed inside the head portion and irradiating illumination light toward the inner wall of the borehole to be imaged through the light transmission portion;
It is formed of a substantially cylindrical body with both ends open, and one of the open ends is connected to the open end of the head portion and inserted into the boring hole, and between the open ends as the insertion depth into the boring hole increases. An extension casing that is extended in series by connection and extended;
A cable for transmitting an imaging signal and supplying power, connected to the imaging means in the head portion through the extension casing from the outside of the boring hole,
The one or more extension casings have sufficient torsional rigidity capable of changing the direction of the head portion with respect to the borehole inner wall from the outside of the borehole,
A boring hole imaging device characterized in that a head portion inserted into the boring hole is moved and rotated in the boring hole to image the inner wall of the boring hole. In the boring hole imaging device according to claim 1,
The boring hole imaging device , wherein the head portion includes wiping means for keeping a light transmitting portion clean . In the boring hole imaging device according to claim 1 or 2,
The outer peripheral portion at a predetermined position of the head portion includes an outermost peripheral portion that contacts the inner wall of the boring hole and an inner peripheral portion that is rotatably engaged inside the outermost peripheral portion and disposed integrally with the head portion. A boring hole imaging device comprising: a head portion bearing body that rotatably holds the head portion with respect to an inner wall of the boring hole . In the boring hole imaging device according to any one of claims 1 to 3,
An inlet holding portion that is formed of a substantially cylindrical body into which the head portion and the extension casing can be inserted, and is disposed at a ground surface side inlet portion of the boring hole and holds the inlet portion so as not to collapse;
It is disposed inside the inlet holding portion, and is rotatably engaged with the outermost peripheral portion contacting the inner wall of the inlet holding portion and the innermost outer peripheral portion, and in contact with the head portion or the surface of the extension casing. A borehole imaging apparatus comprising: an inlet bearing body including an inner peripheral portion that holds the extension casing so as to be movable and rotatable in the axial direction of the borehole. In the boring hole imaging device according to any one of claims 1 to 3 ,
It is formed of a substantially cylindrical body into which the head part and the extension casing can be inserted, and is disposed at the ground surface side entrance portion of the boring hole, and is formed with an angle scale indicating the direction of the head part on the ground surface. An in-boring-hole imaging device comprising an inlet holding portion that covers and holds an inlet portion so as not to collapse . In the boring hole imaging device according to claim 4 ,
An in-boring-hole imaging device , wherein an angle scale indicating the direction of the head portion is formed on the surface of the entrance holding portion on the ground surface side . In the boring hole imaging device according to any one of claims 1 to 6 ,
A boring hole imaging device characterized in that the extension casing is formed with a series of slit-like openings on the peripheral side portion, which can communicate with both open ends and into which a cable connected to imaging means can be inserted. . In the boring hole imaging device according to claim 7 ,
A borehole imaging apparatus , comprising: a spacer that is formed in a substantially linear shape that is detachable from an opening of the extension casing, and that watertightly closes the opening of the extension casing . In the boring hole imaging device according to any one of claims 1 to 8 ,
An imaging direction measuring means for measuring the orientation of the head part with respect to the inner wall of the boring hole is disposed in the head part, and a part of the imaging screen obtained by the imaging means for imaging direction information obtained by the imaging direction measuring means A boring hole imaging device characterized by being displayed on the screen . In the boring hole imaging device according to claim 9 ,
The imaging direction measuring means is formed so that imaging direction information can be displayed on the imaging direction measuring means itself, and is arranged at a predetermined position in a head part that can be imaged by the imaging means. apparatus.

Images