JP2004101359A - Hole wall surface inspection device and inspection method for concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inspect the deterioration and construction bad condition or the like of a concrete structure simply and with good accuracy by obtaining an expanded image of the condition of a concrete hole wall surface. <P>SOLUTION: The cylinder tip of a cylindrical body 10 inserted in an investigation hole 4 is provided with an imaging part 11 having a built-in linear image sensor along the longitudinal direction of the cylinder, and having an image obtaining surface 15 of the linear image sensor 16. The imaging part 11 is provided with a movable support roller 31 for pressing the cylindrical body 10 to the hole wall surface to make the image obtaining surface 15 and the hole wall 5 of the investigation hole 4 closely adhere to each other. The cylindrical body 10 is turned in a designated degree arc in the circumferential direction in the investigation hole 4 in the state of being supported by the movable support roller 31, and with the rotation, an image signal obtained by imaging the hole wall surface 5 irradiated through a photo conductive member by the linear image sensor 16 is output to a personal computer 2 through an interface part 20 to obtain an expanded image of the hole wall surface of an object. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hole wall surface inspection apparatus and a method for inspecting a concrete structure, wherein a small diameter hole is formed in a concrete structure, and the state of the hole wall surface can be imaged in detail. The present invention relates to a concrete structure inspection method capable of easily and accurately inspecting a deterioration of a structure, a poor construction state, and the like.
[0002]
[Prior art]
It has been pointed out that concrete structures constructed in large numbers in various places during the period of high economic growth have various problems in design and construction and generally have low durability. Now, about 30 years have passed since they were constructed, and there are a number of properties that require a soundness as a structure and a deterioration diagnosis of the concrete part. In particular, due to an accident such as a part of the lining concrete in the existing tunnel peeling off and falling, awareness of the durability of concrete structures has increased, and inspection and deterioration diagnosis of structures have been performed regularly. .
[0003]
When inspecting the deterioration of a concrete structure and the state of poor construction, it is best to obtain detailed data inside the concrete. Therefore, a method of extracting and inspecting core-shaped concrete from a predetermined position of a concrete structure is generally used. From the extracted core, it is possible to obtain direct information such as the actual neutralization depth and the generated cracks in the concrete structure, and to obtain highly accurate information as a deterioration diagnosis of the concrete structure. However, the coring operation requires a dedicated cutter device for cutting concrete into a core having a predetermined diameter, depending on the core size. In addition, large-scale equipment such as a jig for fixing the cutter device to a predetermined position of the concrete structure and supply of water to the concrete cut surface is required, which increases the inspection cost and increases the work time. . Further, in order to obtain highly accurate information, it is necessary to extract a core having a somewhat large size. For this reason, the reinforcing bar or the like at the predetermined cover position may be cut, and the structure is seriously damaged, so that it is difficult to obtain a large number of inspection points.
[0004]
Therefore, a predetermined small-diameter boring survey hole is drilled in the concrete to be surveyed, and an imaging device such as a microscope consisting of an optical fiber bundle and a borehole camera equipped with a CCD camera is inserted into the survey hole to cut the hole wall. An inspection method has been developed in which an image is taken and the obtained data is configured as a predetermined image by image processing (for example, see Patent Literature 1 and Non-Patent Literature 1). In addition, as an observation device inside the inspection hole to improve the accuracy of observation, a fiberscope type endoscope having the same function as the endoscope used in the medical examination field was used and obtained with the endoscope. The image is processed by a predetermined image processing device to grasp the situation inside the inspection hole (see Patent Document 2).
[0005]
[Patent Document 1]
JP 2001-41903 A (page 2)
[Patent Document 2]
JP 2001-227925 A (pages 3 to 6)
[Non-patent document 1]
Jiro Fukui et al., "Study on Investigation of Bridge Foundation Structure", "2nd Symposium on Structural Diagnosis", Japan Society of Civil Engineers, August 1999, p. 137-142
[0006]
[Problems to be solved by the invention]
By the way, in each of the above-mentioned methods, when a microscope or an endoscope using an optical fiber bundle is used, the investigation can be performed by drilling a comparatively small inspection hole. However, since the imaging viewing angle of the imaging probe at the tip is limited, the situation of the hole wall portion facing the imaging probe can be grasped, but in order to obtain development information of the hole wall surface at a predetermined depth before and after the imaging probe is located. In addition, many pieces of imaging information must be edited. For this reason, there is a problem that the measurement work in each inspection hole becomes complicated.
[0007]
On the other hand, the borehole camera uses a CCD camera to capture a slice image of the survey hole formed in the mirror housed in the imaging probe in the entire circumferential direction with a CCD camera, and collects the sampled slice information by image processing to develop a predetermined depth range. It is image information. However, this type of borehole camera utilizes a conventional borehole because the diameter of an imaging probe containing a CCD camera and a mirror optical system is large. Therefore, there is a problem that a boring hole drilling equipment is required. In addition, in order to form a hole wall image in a relatively large diameter inspection hole on a mirror optical system housed in the imaging probe, a high-illuminance light source for illuminating the hole wall is additionally required.
[0008]
Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technology, to be able to cope with an investigation hole having a diameter that can be drilled by a conventional drilling device, and to further develop a hole wall in a predetermined depth range. And a method for inspecting a concrete structure, which can quickly and easily obtain a hole.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention incorporates a linear image sensor at the tip of a cylindrical body inserted into an investigation hole along the longitudinal direction of the cylinder, and an opening facing an image acquisition surface of the linear image sensor. Is formed on the cylindrical main body to form an imaging section, and a cylindrical attitude holding means for holding the cylindrical main body on a concentric circle with a hole axis in a hole wall of the inspection hole is provided on a part of the cylindrical main body. Provided, while supporting the cylindrical body by the cylinder attitude holding means, rotate a predetermined angle in the circumferential direction in the investigation hole, and image the hole wall surface illuminated via the light guide with the rotation. An image signal obtained by the linear image sensor is output via an interface unit to obtain a developed image of the wall surface of the target hole.
[0010]
At the tip of the cylindrical body inserted into the inspection hole, a linear image sensor is built in along the longitudinal direction of the tube, and an opening facing the image acquisition surface of the linear image sensor is formed in the cylindrical body to form an imaging unit. And pressing support means for pressing the cylindrical body against the wall surface of the hole so that the image acquisition surface and the hole wall of the inspection hole are in close contact with each other, and the imaging section is supported by the pressing support means. The cylindrical body is rotated at a predetermined angle in the circumferential direction in the inspection hole, the image signal obtained by the linear image sensor by imaging the hole wall surface illuminated through the light guide with the rotation, The image is output through the interface unit to obtain a developed image of the wall surface of the target hole.
[0011]
It is preferable that the developed image is obtained by outputting the image signal to an external drawing processing unit and processing the image signal.
[0012]
It is preferable that the pressing and supporting means includes an urging means capable of pressing the roller support against the hole wall.
[0013]
The cylindrical body of the device according to claim 1, wherein a hole having a diameter that allows insertion with a small gap is drilled, and after the inside of the hole is cleaned, an imaging unit of the device is placed in the hole. The cylindrical body is rotated by a predetermined angle in the circumferential direction while inserting the cylindrical posture holding means so as to substantially maintain the separation between the imaging section of the cylindrical body and the inspection hole wall, and the cylindrical body is guided by the rotation. The hole wall surface illuminated via the optical body is imaged by performing scanning in the hole axis direction and scanning in the circumferential direction, and outputs the obtained image signal to the external drawing processing means via the interface unit. Then, a developed image of the hole wall surface is created and drawn by inspecting the deterioration of the target concrete hole wall surface and the state of poor construction.
[0014]
The cylindrical body of the device according to claim 2, wherein a hole having a diameter capable of being inserted with a small gap is drilled, and after the inside of the hole is cleaned, an imaging unit of the device is placed in the hole. The cylindrical body is rotated by a predetermined angle in the circumferential direction while maintaining the close contact between the image acquisition surface of the imaging unit and the investigation hole wall by the pressing and supporting means by the pressing and supporting means. The hole wall surface illuminated via is captured by performing scanning in the hole axis direction and scanning in the circumferential direction, and the obtained image signal is output to the external drawing processing means via the interface unit. The method is characterized in that a developed image of the hole wall surface is created and drawn by image processing, and the deterioration and poor construction state of the target concrete hole wall surface are inspected.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a hole wall surface inspection device and a concrete structure inspection method of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view showing one embodiment of a hole wall surface inspection apparatus 1. The hole wall surface inspection apparatus includes an apparatus main body 10 having a cylindrical outer shell 13 and an imaging unit 11 in a predetermined range at the tip of the cylinder, and an image signal from a signal line 12 derived from the rear end of the apparatus main body 10. And an interface unit 20 for converting the signal into an image drawing signal and outputting the converted signal to a known personal computer 2.
[0016]
In the present embodiment, the apparatus main body 10 has a cylindrical shape in which a steel pipe having an outer diameter of 21 mm and a total length of 550 mm is used as an outer shell 13, and an imaging unit 11 is provided at a tip. As shown in an enlarged manner in FIG. 2, the imaging unit 11 has an elongated rectangular opening 14 formed at the end thereof, and a linear image sensor inside thereof such that an image acquisition surface 15 of a predetermined length faces the opening 14. 16 are accommodated. In the present embodiment, as the linear image sensor 16, a well-known contact type sensor that uses a LED (not shown) as a light source and reads an image using a 1: 1 optical system of a light guide is used. The linear image sensor 16 can acquire a two-dimensional developed image by scanning in the main scanning direction in the longitudinal direction of the imaging unit 11 and in the sub-scanning direction in which the imaging unit 11 is rotated around the cylindrical axis. In the present embodiment, the movement (rotation) in the sub-scanning direction is performed with high accuracy by acquiring scanning information while measuring the movement distance with an encoder.
[0017]
Here, the linear image sensor refers to a sensor capable of acquiring a two-dimensional image by, for example, arranging light receiving elements in a line (linear) and performing scanning in the arrangement direction of the light receiving elements and in a predetermined direction. In addition to the so-called close-contact type sensor of the same-magnification optical system described above, a light-receiving unit is configured linearly, such as a sensor configured as a light-receiving unit in which a reduced optical system CCD sensor or the like having a focusing function is linearly arranged. The image sensor is wide.
[0018]
The imaging unit 11 is provided with support means for the apparatus main body 10 in order to secure the stability of the apparatus main body 10 during scanning (at the time of rotation). This kind of close contact type sensor has a focal length of about 1 mm or less, so if the distance between the hole wall surface 5 and the image acquisition surface 15 of the sensor is 1 mm or more, a sharp image may not be obtained. Therefore, the apparatus main body 10 of the present invention is provided with pressing support means 30 for pressing the image acquisition surface 15 against the hole wall 5. In the present embodiment, movable support rollers 31 as pressing support means are attached at substantially equal intervals at three positions on the back surface of the image acquisition surface 15 with respect to the rotation direction of the apparatus main body 10 over the entire length of the image acquisition surface 15. Have been. As shown in FIGS. 2 and 3, each movable support roller 31 includes a bearing member 32 that is coaxially supported rotatably with respect to one rotation shaft (not shown) disposed in the apparatus main body 10, and a bearing member. The rubber roller 33 is supported by a shaft 32 and a torsion spring 34 for urging the rubber roller 33 against the hole wall 5. As shown in FIG. 1, the end of the rotation shaft projects from the apparatus main body 10, and a predetermined rotation can be given from the outside by an operation knob 35. Therefore, when the apparatus main body 10 is inserted into the inspection hole, the movable support roller 31 projecting outward is temporarily inserted into the apparatus main body 10 so as to resist the urging force of the torsion spring 34 using the operation knob 35. So that it can be easily inserted into the investigation hole 4 (FIG. 1).
[0019]
Further, an independent roller 36 and a spacer 37 are provided near the edge of the opening 14 of the imaging unit 11 in order to maintain smooth rotation of the apparatus main body 10. As shown in FIG. 2, the independent rollers 36 are arranged at a predetermined distance in the longitudinal direction at the rear end side of the image acquisition surface 15, and each roller can rotate independently. On the other hand, a spacer 37 having a predetermined thickness is attached to the front end side of the image acquisition surface 15. By sliding the apparatus main body 10 at the position of the spacer 37, the separation between the image acquisition surface 15 and the hole wall 5 can be maintained so as to secure a predetermined focal length. Further, a part of a roller 17 of an encoder (not shown) is attached so as to protrude from the outer shell 13 in order to detect a rotational movement amount of the apparatus main body 10.
[0020]
The handling of the image signal acquired by the linear image sensor 16 will be described with reference to FIG. A switch at hand of the apparatus main body 10 is turned on to emit RGB light of an LED light source (not shown) in order, illuminate and reflect the hole wall 5 via a light guide, and an image acquisition surface via an optical system. The amount of light of each color reaching the light receiving surface of the linear image sensor 16 at the 15 position is sampled as an analog signal. The image signals obtained by the primary-arranged light receiving elements (not shown) are sequentially output via a signal line 12 in synchronization with a predetermined clock with an analog signal via an amplifier. The output image data signal is input to a standardized PC card 20 as image signal conversion means, subjected to predetermined image signal processing, and rendered as a predetermined developed image on the personal computer 2 on which the PC card 20 is mounted. Can be done.
[0021]
As shown in FIG. 1, the PC card 20 as the interface unit 20 converts an input analog signal into a digital signal in an A / D circuit 21 and then a scanner control unit 22 in the PC card 20. The acquired image signals are collected, and an image signal corresponding to actual hole wall data is generated. Further, in the interface control unit 23, the information is converted as delivery information for drawing processing in the personal computer 2, and predetermined drawing processing is performed in the personal computer 2. It goes without saying that the interface of the personal computer 2 can be connected via a USB terminal, an IEEE1394 terminal or the like in addition to the PC card specifications described above.
[0022]
It is preferable that the personal computer 2 be provided with a pre-processing unit in addition to the image processing and drawing processing units. In the pre-processing unit, unevenness in rotation speed when rotating the imaging unit, blur in the hole axis direction, rotation axis The distortion or the like generated in the acquired image signal due to the fall of the image can be complemented and shaped. The image database can be sequentially stored as compressed data, and a large number of stored data can be statistically processed and edited as mapping information to diagnose deterioration of the entire target structure and poor construction. . At this time, it is preferable to improve the accuracy of the diagnosis work by processing the image data and adding additional information such as design and construction data.
[0023]
FIG. 4 is a cross-sectional view for explaining a state in which the hole wall surface inspection device is imaging the hole wall 5 of the inspection hole 4. As shown in FIG. 2A, at the time of imaging, the imaging unit 11 of the apparatus main body 10 is brought into contact with the hole wall 5 by the spacer 37, the independent roller 36, the encoder roller 17, and the movable support roller 31 in the inspection hole 4. It may be rotated in the direction of the arrow in the state of being pressed. In order for each roller to stably support the rotation of the apparatus main body 10, the apparatus main body 10 is rotated while the image acquisition surface 15 of the built-in linear image sensor (not shown) is kept at a fixed distance from the hole wall 5. be able to. In particular, since the movable support roller 31 can always press the rubber roller 33 against the hole wall 5 by the urging force of the torsion spring 34 (FIG. 3), the image acquisition surface 15 faces upward as shown in FIG. It can be ensured that the image acquisition surface 15 is pressed against the hole wall 5 even in such a rotational position.
[0024]
In the present embodiment, as shown in each of FIGS. 4A and 4B, a seal-like marker 6 is attached to the hole wall 5 in order to grasp the scale on the obtained developed image. Since the marker 6 is stuck at a position facing the hole wall surface 5, when the developed image is obtained, it appears on the image every half circumference. A jig for attaching the marker 6 to the hole wall and a method for attaching the jig will be described with reference to FIG. The marker attachment jig 40 shown in FIG. 5A has a cylindrical main body 41 and a marker sticking projection 42 projecting a predetermined amount in the hole wall direction by the operation of a link mechanism (not shown) housed in the main body. And The marker sticking projection 42 protrudes toward the hole wall 5 by operating the link mechanism on the hand side of the tubular main body 41, and the tip can abut the hole wall 5. At this time, the marker 6 is temporarily fixed to the predetermined position of the hole wall 5 when the protrusion 42 is brought into contact with the hole wall 5 by temporarily holding the seal-like marker 6 with the glue surface facing outward at the tip of the protrusion. Can be stuck. Moreover, since the scale 44 is provided on the cylindrical main body 41 in the longitudinal direction, the marker 6 can be attached at a predetermined depth as shown in FIG.
[0025]
FIG. 6 is a developed view schematically showing an example of a developed image obtained by imaging a state of an investigation hole drilled in concrete. As shown in the figure, the markers 6 are projected at intervals of 180 ° in the circumferential direction and at set intervals P in the depth direction on the developed view. In the present embodiment, a 1 mm square seal having a diameter of 5 mm is used as the marker 6. Using this grid, the width and length of the crack C appearing on the developed view, the size of the void V, the range of neutralization, and the like can be quantitatively grasped easily and with high precision.
[0026]
7 and 8 are cross-sectional views showing a modification of the pressing support means of the present embodiment. In this modified example, as shown in FIG. 7, a cantilevered leaf spring member 45 is fixed to a part of the outer shell 13 by a screw 46 instead of the movable support roller. The leaf spring member 45 is formed by laminating a leaf spring steel 47 having a predetermined thickness and a friction reducing plate 48 made of a Teflon (trade name: registered trademark) plate or the like, and when the apparatus main body 10 is inserted into the inspection hole. As shown in FIG. 8, the free end side 45a of the leaf spring member 45 is deformed according to the diameter of the hole, and the hole wall 5 is pressed with a pressing force corresponding to the amount of deformation. As a result, the image acquisition surface 15 at the position facing the cylinder is reliably pressed against the hole wall 5, and the focal length of the built-in linear image sensor is secured.
[0027]
Next, a configuration of a hole wall surface inspection apparatus that can acquire an image of a hole wall using a posture holding unit instead of the above-described pressing support unit will be described with reference to FIGS. 9 and 10.
The hole wall surface inspection apparatus shown in FIGS. 9 and 10 uses a linear image sensor in which reduction optical CCD sensors having a relatively long focusing distance are linearly arranged. In this linear image sensor, there is no need to make close contact between the image acquisition surface and the hole wall, and even if there is some variation in distance, a clear image can be obtained because the image is focused. For this reason, if the cylindrical device main body can hold the rotation axis substantially in the inspection hole and can rotate in the state of being held also in the hole axis direction (hole depth direction), it is possible to obtain a developed image of the hole wall therebetween. it can.
[0028]
FIG. 9 shows an apparatus in which blurring in the axial direction of the hole is prevented by a tip pin as an axial attitude holding means. As shown in the figure, the tip (deepest part) of the inspection hole 4 has a shape that is previously sharpened like a cone, and the tip of the tip pin 71 is held at the central apex 4a. This prevents the apparatus main body 10 from rotating back and forth in the direction of the hole axis and preventing the image acquisition surface 15 of the imaging unit 11 from blurring. At this time, a spacer ring 72 is mounted in a gap between the apparatus main body 10 at the hole opening position and the hole wall 5, so that the rotation axis (hole axis) x is prevented from falling down. Further, an encoder 74 and a ring 73 holding the encoder are attached outside the hole, so that the rotation state of the apparatus main body 10 can be detected with high accuracy, and data that matches the rotation angle of the apparatus with the acquired image can be obtained. It is supposed to be.
[0029]
FIG. 10 shows that the device is prevented from falling down with respect to the rotation axis x at the time of rotation by a roller support portion 75 as a circumferential orientation holding means attached to a predetermined position in the imaging section 11 in the hole 4 in the axial direction. A device in which blur is regulated by a ring 73 is shown. This device can also reliably prevent the hole axis direction and the rotation shaft from falling.
[0030]
Next, a series of operations from drilling of the inspection hole to imaging of the hole wall will be described with reference to FIGS.
In the inspection method of the present invention, in order to obtain a clear image, the roundness and linearity of the drilled inspection hole 4 are also important requirements. Therefore, in the present invention, in order to improve the accuracy of the roundness and the linearity of the hole, the drill 53 is mounted on the drilling guide 50 as shown in FIG.
[0031]
The drilling guide 50 includes a slide bar 51 for maintaining the straightness of a drill 53 as a drilling device, a pressing plate 52 for holding the drilling guide 50 at a drilling position on a concrete surface, and a drill bit 53a using the pressing plate 52. And a biasing spring 55 for improving the operational stability of the drill 53 and the closeness of the pressing plate. FIG. 5A shows a state immediately after the start of drilling by the drill 53. At this time, the slide bar 51 is supported on the upper surface of the drill 53 via the slider 56. An urging spring 55 in an initial shortened state is mounted between the slider 56 and the slide bar 51. A pressing plate 52 is attached to the tip of the slide bar 51, and a drill bit 53a is held via a guide bush 54 provided at a center position of the pressing plate 52. When drilling is performed in the direction of the arrow as shown in FIG. 5B from this state, the biasing spring 55 expands, thereby increasing the force pressing the slide bar 51 and the pressing plate 52 against the concrete surface. Thus, the adhesion of the pressing plate 52 can be increased, and the stability during drilling can be increased.
[0032]
When the drilling to the predetermined depth is completed, the inside of the hole is cleaned. As shown in FIG. 3C, the nozzle 61 of the blower 60 is inserted into the hole, and when the air is blown, a large amount of drill powder accumulated in the hole is scraped off at the tip of the nozzle 61 to efficiently remove the drill powder. Can be removed. Further, as shown in FIG. 5D, the inside of the inspection hole 4 is washed with water using a brush 62 to remove the drill powder adhering to the hole wall 5, and the inside of the hole is cleaned. After the inside of the hole is dried with a drier or the like (not shown), if necessary, as shown in FIG. 6 is attached. Then, as shown in FIG. 2F, the hole wall surface inspection apparatus 1 connected to the personal computer 2 can image a predetermined range of the hole wall 5 in the inspection hole. The acquired image information may be drawn by the portable personal computer 2 in real time, or may be stored as data in a storage medium (not shown), and drawn and checked later collectively.
[0033]
【Example】
In order to examine the distortion and change in color tone of the image obtained by this inspection method, 1 mm grid paper is attached to the inner surface of a round pipe with an inner diameter of 22.8 mm, the target surface is scanned, and the image accuracy, quality, etc. are examined. went. As a result, the ruled line of the 1 mm grid paper can be clearly confirmed, and no distortion occurs in the image in both the longitudinal direction and the circumferential direction of the pipe. The color tone was almost the same as the actual color tone. In addition, no compression of image data and no defects (blindness of the image) occurred, and a sharp image that could confirm an object of 1 mm or less was obtained.
[0034]
【The invention's effect】
As described above, even with the method of inspecting the inside of concrete using the hole wall inspection device of the present invention, the neutralization, cracking, chloride ion penetration depth test, and the like, which have been inspected without a core, have been performed. It was confirmed that it was possible with the same accuracy. In addition, it is possible to obtain an effect that the cost, the workability, and the efficiency are higher than those of the test using a core.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing an embodiment of a hole wall surface inspection apparatus according to the present invention.
FIG. 2 is a partially enlarged perspective view showing an image pickup unit of the hole wall surface inspection device shown in FIG. 1 in an enlarged manner.
FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. 2;
FIG. 4 is a state explanatory view showing a hole wall imaging state by the hole wall surface inspection device.
FIG. 5 is a state explanatory view showing a marker mounting jig and a marker mounting state.
FIG. 6 is a schematic developed view showing an example of a developed image of a hole wall obtained by the present apparatus.
FIG. 7 is an apparatus sectional view showing a modification of the pressing support means.
FIG. 8 is a state explanatory view showing an operation state of the pressing support means shown in FIG. 7;
FIG. 9 is an overall perspective view showing an embodiment of a hole wall surface inspection apparatus in which the apparatus is prevented from being shaken during rotation by a posture holding means.
FIG. 10 is an overall perspective view showing another embodiment of a hole wall surface inspection apparatus in which the apparatus is prevented from being shaken during rotation by a posture holding means.
FIG. 11 is an explanatory view showing a series of work procedures in the concrete inspection method of the present invention (part 1).
FIG. 12 is an explanatory view showing a series of work procedures in the concrete inspection method of the present invention (part 2).
[Explanation of symbols]
REFERENCE SIGNS LIST 1 hole wall inspection device 2 personal computer 5 hole wall 10 apparatus main body 11 imaging unit 12 signal line 15 image acquisition surface 16 linear image sensor 17 roller 20 interface unit 31 movable support roller 36 independent roller 37 spacer 40 marker mounting jig 50 drilling guide

Claims (6)

At the tip of the cylindrical body inserted into the inspection hole, a linear image sensor is built in along the longitudinal direction of the tube, and an opening facing the image acquisition surface of the linear image sensor is formed in the cylindrical body to form an imaging unit. And a cylinder attitude holding means for holding the cylindrical body in a hole wall of the inspection hole concentrically with a hole axis is provided in a part of the cylindrical body, and the cylindrical attitude holding means is used to form the cylindrical body. While supporting the main body, rotated by a predetermined angle in the circumferential direction in the investigation hole, the image signal obtained by the linear image sensor to capture the hole wall surface illuminated via the light guide with the rotation, A hole wall surface inspection apparatus, which outputs the image through an interface unit and obtains a developed image of the target hole wall surface. At the tip of the cylindrical body inserted into the inspection hole, a linear image sensor is built in along the longitudinal direction of the tube, and an opening facing the image acquisition surface of the linear image sensor is formed in the cylindrical body to form an imaging unit. And pressing support means for pressing the cylindrical body against the wall surface of the hole so that the image acquisition surface and the hole wall of the inspection hole are in close contact with each other, and the imaging section is supported by the pressing support means. The cylindrical body is rotated at a predetermined angle in the circumferential direction in the inspection hole, the image signal obtained by the linear image sensor by imaging the hole wall surface illuminated through the light guide with the rotation, A hole wall surface inspection apparatus, which outputs the image through an interface unit and obtains a developed image of the target hole wall surface. 3. The hole wall surface inspection apparatus according to claim 1, wherein the developed image is obtained by outputting the image signal to an external drawing processing unit and processing the image signal. 3. The hole wall surface inspection apparatus according to claim 2, wherein the pressing and supporting means includes an urging means capable of pressing a roller support against the hole wall. The cylindrical body of the device according to claim 1, wherein a hole having a diameter that allows insertion with a small gap is drilled, and after the inside of the hole is cleaned, an imaging unit of the device is placed in the hole. The cylindrical body is rotated by a predetermined angle in the circumferential direction while inserting the cylindrical posture holding means so as to substantially maintain the separation between the imaging section of the cylindrical body and the inspection hole wall, and the cylindrical body is guided by the rotation. The hole wall surface illuminated via the optical body is imaged by performing scanning in the hole axis direction and scanning in the circumferential direction, and outputs the obtained image signal to the external drawing processing means via the interface unit. A method for inspecting a concrete structure, characterized in that a developed image of the hole wall surface is created and drawn by performing image processing, and deterioration and improper construction of the target concrete hole wall surface are inspected. The cylindrical body of the device according to claim 2, wherein a hole having a diameter capable of being inserted with a small gap is drilled, and after the inside of the hole is cleaned, an imaging unit of the device is placed in the hole. The cylindrical body is rotated by a predetermined angle in the circumferential direction while maintaining the close contact between the image acquisition surface of the imaging unit and the investigation hole wall by the pressing and supporting means by the pressing and supporting means. The hole wall surface illuminated via is captured by performing scanning in the hole axis direction and scanning in the circumferential direction, and the obtained image signal is output to the external drawing processing means via the interface unit. A method for inspecting a concrete structure, characterized in that a developed image of the hole wall surface is created and drawn by image processing, and deterioration and poor construction of the target concrete hole wall surface are inspected.

Images