JP6503712B2 - Intra-hole imaging device - Google Patents

Description

  The present invention relates to an intra-hole imaging device for imaging the inside of a lateral borehole.

  In order to grasp the geological condition of the planned construction area, it is widely known to drill a geological survey by drilling a borehole in the horizontal direction and providing a boring hole for survey in order to construct a structure. In addition, a camera is inserted using these boreholes, and the construction manager visually observes the images in the boreholes taken by the camera, and the survey method for grasping the geological condition in the planned construction area is also known. It is done.

  For example, in Patent Document 1, after boring a ground in the horizontal direction by the Nakabori method using a casing and providing a boring hole for investigation, leaving a casing in the boring hole for investigation and pulling out a drilling bit There is disclosed a method of inserting a borehole camera into a casing and projecting it from a tip opening of the casing and photographing a hole wall with the borehole camera.

Unexamined-Japanese-Patent No. 09-132992

  However, since the imaging method described in Patent Document 1 aims to investigate the collapsible ground, a casing for protecting the hole wall is installed in the horizontal borehole. Therefore, when the horizontal borehole is long, the installation of the casing is complicated and the cost of the construction tends to be huge.

  In addition, even in the case of surveying non-collapsed ground, sliming is likely to be stored in the lower part of the borehole if the borehole is drilled in the horizontal direction. For this reason, the camera inserted in the borehole is buried in the slime and the inside of the hole can not be clearly photographed, or the course is blocked by the slime, and the camera can not reach the desired photographing position. .

  The present invention has been made in view of such problems, and the main object thereof is to photograph the inside of a horizontal boring hole which is simple in operation and easy to operate and capable of photographing clear images. To provide an intra-hole imaging device for

In order to achieve the above object, an intra-hole imaging device of the present invention is an intra-hole imaging device for imaging the inside of a hole of a lateral boring hole, and includes an illumination device and a camera body on the front end side. And a plurality of protrusions disposed on the outer surface of the in-hole camera and arranged to project in the radial direction of the horizontal boring hole to support the in-hole camera, and a rear end side of the in-hole camera is installed, e Bei a rod adjustable, the length, the protrusion is a tensile force by, characterized in that it is installed to be separated from the outer surface of the hole in the camera. Further, the in-hole imaging device of the present invention is characterized in that the protrusion is installed on a planar member which is wound around and fixed to the outer surface of the in-hole camera by a tensile force.

  According to the above-described intra-hole imaging device, since the intra-hole camera is supported by the projection located between the hole wall of the lateral boring hole and the outer surface of the intra-hole camera, A gap is formed in the Thus, for example, in the case of applying the in-hole imaging device to a horizontal borehole drilled in the ground, most of them are located between the in-hole camera and the hole wall, even if slime remains in the borehole. It will be located in the gap.

  For this reason, the camera in the hole is not buried in the slime, and the camera in the hole can clearly photograph the condition of the hole wall in the borehole, such as a crack in the hole wall or the geological condition. It becomes possible to carry out visual confirmation correctly.

  Moreover, when advancing or retracting the in-hole camera, it is possible to minimize the insertion resistance and the pull-out resistance acting on the in-hole camera due to the slime staying. As a result, since it is possible to easily insert or withdraw the in-hole camera manually via the rod, it is possible to perform visual observation of the hole wall with a camera image in a short time and easily.

  Furthermore, since the intra-hole imaging device has a simple structure in which the intra-hole camera is provided with a protrusion and a rod that can be adjusted in length, the intra-hole imaging device can be manufactured using inexpensive materials. It is possible to significantly reduce such costs, and it is highly versatile, and it is possible to observe the hole wall of any horizontal borehole without being influenced by the size and length of the inner diameter of the horizontal borehole. Can also be applied.

  According to the above-described intra-hole imaging device, when a narrow portion is generated in the lateral boring hole due to some circumstances and the projection bites, a predetermined or more force in the axial direction of the lateral boring hole with respect to the intra-hole imaging device Since the tensile force acts on the projections and the planar body, the projections and the planar body can be separated from the outer peripheral surface of the in-hole camera. Thus, although the projection and the planar body are left in the borehole, the in-hole camera can be smoothly recovered, and the recovered in-hole camera can be repeatedly used, which is economical.

  The intra-hole imaging device of the present invention is characterized in that the protrusion is made of a synthetic resin material.

  According to the above-described intra-hole imaging device, since the projection can be appropriately cut at the site and appropriately adjusted to the length according to the inner diameter of the horizontal boring hole, it has high versatility and easy handling.

  According to the present invention, the projection is formed on the outer peripheral surface of the in-hole camera so as to be able to support the load of the in-hole camera, and the rear end side is provided with the adjustable length rod. While being able to be applied easily to a long borehole with good characteristics, the gap formed between the wall of the hole and the lower part of the camera in the hole by the protrusion allows the effect of slime to be stored in the hole. It is possible to capture a clear image at a minimum.

It is a figure at the time of arrange | positioning a borehole imaging device in a borehole. It is a figure which shows the protrusion installed in the outer peripheral surface of the imaging device in a hole. It is a figure which shows the rod of an intra-hole imaging device. It is a figure which shows the detail of a projection. It is a figure at the time of removing an intra-hole imaging device from a borehole.

  Hereinafter, the intra-hole imaging device 1 of the present invention will be described with reference to FIGS. 1 to 5.

  The intra-hole imaging device 1 of the present invention is a device for inserting into a newly formed or existing horizontal borehole and visually observing the state of the hole wall or the hole bottom with a camera image. In the present embodiment, as shown in FIG. 1, the case where the in-hole imaging device 1 is applied to a horizontal boring hole A drilled in a ground is taken as an example and described in detail below. In the present invention, the lateral direction includes not only the horizontal direction but also the oblique direction.

  As shown in FIG. 1, the in-hole imaging device 1 includes an in-hole camera 2, a plurality of protrusions 3 installed on the outer surface of the in-hole camera 2, and a rod 4 installed on the rear end side of the in-hole camera 2. It consists of

  As shown in FIG. 2A, the in-hole camera 2 includes a camera body 21 for imaging the inside of the hole, and a camera protector 22 for storing and protecting the camera body 21.

  The camera body 21 is a CCD camera which has been widely used conventionally for shooting in a vertical borehole or in a well, etc. It is also possible to shoot both still images and moving images. As shown in FIG. 2B, the camera body 21 is provided with the LED illumination 23 so that a full-color clear image can be obtained even in a dark hole.

  The camera body 21 is also connected by wire via a video cable 24 to a terminal device P installed outside the borehole A as shown in FIG. Therefore, the in-hole image captured by the camera body 21 can be visually checked in real time with an output device such as a display provided in the terminal device P, and stored in the storage device provided in the terminal device P It is also possible.

  The camera protector 22 is a cylindrical body sized to accommodate the camera body 21 as shown in FIGS. 2 (a) and 2 (b), and is lightweight and watertight such as a polyvinyl chloride pipe or an aluminum pipe. Is formed of a material having a rigidity that does not deform even when the wall of the hole is fallen. Then, one end face 22a of the camera protector 22 is opened and the other end face 22b is closed, and as shown in FIG. 2B, the camera body 21 is made to face the one end face 22a. The camera body 21 is disposed inward of 22.

  Therefore, the in-hole camera 2 is inserted into the borehole A with one end face 22a of the camera protector 22 facing the camera body 21 as the front end side.

In addition, the shape of the camera protection body 22 is not necessarily limited to a cylindrical body, and as long as the camera main body 21 can be stored, any shape may be applied.
Also, although a camera of waterproof specification is adopted for the camera body 21, a water blocking member such as packing not shown between the opening at one end face 22a of the camera protector 22 and the camera body 21 positioned inward thereof Place. As a result, water does not enter the inside of the camera protector 22 even when underground water is stagnant in the borehole A or when the borehole A is submerged due to spring water.

  Then, as shown in FIG. 2A, the in-hole camera 2 is advanced or retracted in the borehole A on the rear end side of the in-hole camera 2 described above, that is, on the other end face 22b of the camera protector 22. The rod 4 for making it move is detachably installed.

  As shown in FIG. 3, the rod 4 is formed by connecting a plurality of rod main bodies 41 made of a pipe material, and the material thereof is, like the camera protector 22, a polyvinyl chloride pipe, an aluminum pipe, etc. It is made of a material that is light in weight and has a rigidity that does not deform even if the hole wall of the borehole A falls. A male joint 41a is provided at one end of the rod body 41, and a female joint 41b is provided at the other end, and these are fitted to each other. Therefore, it is possible to freely adjust the length of the rod 4 by connecting the rod bodies 41 by a desired number.

  Further, a joint 22c that can be fitted to either the male joint 41a or the female joint 41b of the rod main body is formed on the rear end side of the in-hole camera 2, that is, the other end face 22b of the camera protector 22. The male joint 41a or the female joint 41b of the main body 41 is detachably attachable. Thereby, the rod 4 is connected to the in-hole camera 2.

  As a result, when the builder grasps the rod 4 and inserts the intra-hole camera 2 into the borehole, the intra-hole imaging device 1 captures the inside of the hole with the camera body 21 housed in the intra-hole camera 2 It is possible to When the borehole A is long, any hole wall position in the borehole A can be inserted by inserting the in-hole camera 2 while adjusting the length of the rod 4 while appropriately connecting the rod body 41. Also, the in-hole camera 2 can reach.

  The structure of the rod 4 and the connection structure between the rod 4 and the in-hole camera 2 are not necessarily limited to the above-described configuration. As long as the builder has a configuration that allows the in-hole camera 2 to be inserted into the borehole A, it may be formed anywhere.

  Also, as shown in FIG. 2A, the other end face 22b of the camera protector 22 is provided with a through hole (not shown) communicating with the inside of the rod 4. And although the video cable 24 of the camera main body 21 accommodated in the camera protector 22 mentioned above through this through hole is wired inside the rod 4, the wiring of the video cable 24 is necessarily limited to this. is not. For example, it may be configured to be along the outer peripheral surface of the rod 4.

  Furthermore, although not shown, a scale is provided on the rod main body 41, and when the in-hole imaging device 1 is inserted into the borehole A, the distance from the hole to the in-hole camera 2 can be simply measured. It is also good.

  The intra-hole imaging device 1 further includes a plurality of protrusions 3 on the outer peripheral surface of the intra-hole camera 2 as shown in FIG.

  The protrusion 3 is a rod-like body, and as shown in FIG. 1B, it is installed on the outer surface of the camera protector 22 constituting the in-hole camera 2 so as to protrude in the radial direction of the boring hole A. In the present embodiment, a plurality of projections 3 are arranged so as to project at equal intervals in the radial direction from the outer peripheral surface of the cylindrical camera protection body 22. The arrangement spacing in the radial direction may be any, but it is desirable to arrange at a pitch of 40 ° to 45 °. Further, as shown in FIG. 1A, a plurality of protrusions 3 are disposed not only in the radial direction of the camera protector 22 but also in the longitudinal direction.

  As shown in FIG. 2 (b), the length of the plurality of protrusions 3 is adjusted so that the center of the camera body 21 in the in-hole camera 2 coincides with the axis C of the borehole A. When the in-hole camera 2 is inserted into the borehole A, it functions as a center riser. In the present embodiment, a synthetic resin material is applied to the protrusion 3, and the protrusion 3 is appropriately cut on the site according to the inner diameter of the bore hole A so as to have a length functioning as a center riser, and the length Is adjustable.

  By the way, since the intra-hole imaging device 1 of the present invention is applied to the borehole A in the lateral direction, when the intra-hole imaging device 1 is inserted into the borehole A in the lateral direction, As shown in FIG. 1B, the load of the in-hole camera 2 acts on the protrusion 3 located between the borehole A and the hole wall. For this reason, the plurality of protrusions 3 are formed so as to be supported without being deformed even when the load of the in-hole camera 2 acts.

As a structure of the protrusion 3 for supporting the in-hole camera 2, for example, a material having sufficient rigidity to support the in-hole camera 2 in the protrusion 3 may be employed. In this case, the arrangement interval in the radial direction with respect to the in-hole camera 2 can be widened, and the number of arrangements in the longitudinal direction can be reduced. When a material with low rigidity is used for the protrusion 3, the arrangement interval in the radial direction with respect to the in-hole camera 2 may be narrowed, and the number of arrangements in the longitudinal direction may be increased.
Thus, the projection 3 may be configured to be able to support the intra-hole camera 2 by appropriately adjusting the rigidity of the material to be applied, the arrangement interval in the radial direction with respect to the intra-hole camera 2, and the number of arrangement in the longitudinal direction. .

  Furthermore, the projection 3 having the above-described configuration is disposed so as to separate from the outer surface of the in-hole camera 2 when a tensile force of a predetermined amount or more acts. However, the installation method is not limited at all, and may be installed directly or indirectly.

As a method of directly installing the protrusion 3, for example, it may be adhesively fixed to the outer surface of the in-hole camera 2 by an adhesive. Further, as a method of indirectly installing the protrusions 3, for example, as shown in FIG. 4, it is preferable to install the planar body 31 provided with the protrusions 3 so as to be separated on the outer surface of the in-hole camera 2.
Hereinafter, an example in which the planar body 31 provided with the protrusion 3 is separably installed on the outer surface of the in-hole camera 2 will be described in detail.

  In the planar body 31, as shown in FIG. 4, a plurality of wire members 31a extending in one direction are arranged in parallel with intervals, and a plurality of wire members 31b extending in the direction intersecting with the same are similarly arranged in parallel Are arranged, and the grid is formed by a grid-like network in which the intersections are integrally fixed. These are formed of a synthetic resin material similar to that of the protrusion 3 and a plurality of protrusions 3 are integrally fixed by providing a space on one surface.

  When these planar bodies 31 are installed in the in-hole camera 2, as shown in FIG. 2A, the planar body 31 with the surface on which the protrusions 3 are disposed facing outward is the camera 2 in the inside of the hole. After being wound around the camera protector 22 constituting the above, the fixing member 5 such as a binding band is passed over and tightened on the wire members 31 a located at both ends of the planar body 31. Further, a hole (not shown) is formed at the end edge of one end 22a of the camera protector 22, and as shown in FIG. 2 (b), the wire 31b constituting the sheet 31 and the camera protection through the hole. Similarly, the body 22 is fixed by a fixing member 5 such as a binding band.

  In addition, the fixing member 5 employs a member having a stronger tensile force than the wire members 31 a and 31 b constituting the planar body 31. Thus, when a tensile force of a predetermined amount or more acts on both the fixing member 5 and the planar body 31, the wires 31a and 31b are broken ahead of the fixing member 5.

  For this reason, for example, when the planar body 31 provided with the projection 3 bites into the narrowing portion in the hole wall of the borehole A, the axial direction force of the borehole A in the intra-hole imaging device 1, that is, pushing force or pulling out Apply force. Then, a tensile force acts on both the planar body 31 and the fixing member 5. When the tensile force exceeds a predetermined amount, the wires 31a and 31b constituting the sheet 31 break before the fixing member 5, so the sheet 31 is easily separated from the in-hole camera 2.

  Note that the planar body 31 and the fixing member 5 are not necessarily limited to the above configuration, and for example, if the planar body 31 and the in-hole camera 2 can be separated, for example, You may employ | adopt the material which fractures | leads up prior to wire 31a, 31b which comprises the planar body 31. FIG.

  With the configuration described above, when the builder grasps the rod 4 and inserts the in-hole camera 2 into the borehole A, the in-hole imaging device 1 of the present invention functions as a center riser because the plurality of protrusions 3 function as a center riser. The inner camera 2 is disposed at a position where the center of the camera body 21 coincides with the axis of the borehole A without touching the hole wall of the borehole A.

  Further, since a gap is formed by the projection 3 between the in-hole camera 2 and the hole wall of the boring hole A, for example, as shown in FIG. Also in these cases, most of these slimes B are located between the in-hole camera 2 formed by the protrusions 3 and the hole wall of the borehole A. Therefore, even if the in-hole camera 2 is inserted into the borehole A, the in-hole camera 2 is not buried in the slime B, and the camera body 21 bore holes such as cracks in the borehole wall in the borehole A and geological conditions. The inside of A can be clearly photographed, and it becomes possible to accurately check the geology of the survey target.

  Also, even if the in-hole camera 2 is advanced in the borehole A, the slime B can be released from the gap between the in-hole camera 2 and the bore wall of the borehole A. Therefore, since the insertion resistance that acts on the in-hole camera 2 can be minimized, it becomes possible to perform observation of the inside of the hole by the in-hole imaging device 1 manually and easily in a short time.

  On the other hand, when the in-hole camera 2 is pulled out, the slime B can be similarly released from the gap between the in-hole camera 2 and the hole wall of the boring hole A. Therefore, it is possible to minimize the pullout resistance acting on the in-hole camera 2.

  Further, for example, in the middle stage of the in-hole observation by the in-hole camera 2, a part of the hole wall in the borehole A collapses to cause a partial narrowing in the borehole A, and the protrusion 3 bites into the narrowing In this case, the pullout force may be continuously applied to the in-hole camera 2 via the rod 4.

  Then, a tensile force acts on the planar body 31 and the fixing member 5 through the in-hole camera 2. Therefore, as shown in FIG. It is separated from the camera. As a result, although the protrusion 3 and the planar body 31 are left in the borehole A, the in-hole camera 2 can be recovered smoothly. Therefore, the collected in-hole camera 2 can be used repeatedly.

  The intra-hole imaging device 1 of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

  For example, in the present embodiment, the case where the intra-hole imaging device 1 is applied to a borehole A drilled in a ground is described in detail as an example, but the lateral borehole is not necessarily limited to this. For example, when examining the integrity of an existing concrete structure, it may be applied to horizontal core boring or the like drilled to collect a core.

  Further, in the present embodiment, the protrusions 3 are formed in a rod shape, and as shown in FIG. 2, the protrusions 3 are arranged at equal intervals of 40 ° in the radial direction with respect to the outer peripheral surface of the in-hole camera 2 However, the shape, the number, and the arrangement intervals of the protrusions 3 are not necessarily limited to the above-described configuration. As long as it functions as a center riser and can support the load of the in-hole camera 2 by the projection 3 positioned between the lower portion of the in-hole camera 2 and the hole wall of the borehole A, it is installed in any shape, number and arrangement May be

  Furthermore, in the present embodiment, a lattice-like mesh body is adopted for the planar body 31, but the present invention is not necessarily limited to this. As long as it is a member that can be bent along the outer surface of the in-hole camera 2, any planar body 31 such as a woven fabric, a net having a different grid shape, a band-shaped material, etc. may be adopted. In addition, the sheet-like body 31 may appropriately use a material made of a commercially available synthetic resin material such as a geogrid or a mat for removing cats.

DESCRIPTION OF SYMBOLS 1 intra-hole imaging device 2 intra-hole camera 21 camera main body 22 camera protector 23 LED illumination 24 video cable 3 protrusion 31 planar body 4 rod 41 rod main body 5 fixing member A lateral boring hole B terminal device

Claims (3)

An intra-hole imaging device for imaging the inside of a horizontal borehole,
An in-hole camera comprising a lighting device and a camera body on the front end side;
A plurality of protrusions disposed on the outer surface of the in-hole camera and arranged to project radially of the lateral borehole to support the in-hole camera;
The installed on the rear end side of the hole in the camera, e Bei a rod adjustable, the length,
The intra-hole imaging apparatus , wherein the protrusion is installed so as to be separable from the outer surface of the intra-hole camera by a tensile force . An intra-hole imaging device for imaging the inside of a horizontal borehole,
An in-hole camera comprising a lighting device and a camera body on the front end side;
A plurality of protrusions disposed on the outer surface of the in-hole camera and arranged to project radially of the lateral borehole to support the in-hole camera;
The installed on the rear end side of the hole in the camera, e Bei a rod adjustable, the length,
The in-hole imaging apparatus characterized in that the protrusion is installed on a planar material that is wound around and fixed to the outer surface of the in-hole camera by a tensile force . In the intra-hole imaging device according to claim 1 or 2 ,
The intra-hole imaging device, wherein the protrusion is made of a synthetic resin material.