JPH08218763A - Cracik measuring device in bore hole - Google Patents

Abstract

PURPOSE: To make it possible to measure quantitatively the condition of cracks or unevennesses in a bedrock. CONSTITUTION: A camera 3 is provided to the inside of the end of a cylindrical pipe 1, and in a crack measuring device in a bore for measuring the crack of the wall surface of a boring hole by inserting the pipe 1 into the boring hole, it is equipped with a projector 4 irradiating a laser beam with plane single wave length spread in the shape of a fan and the CCD camera 3 making a film of a place irradiating the laser beam to the wall surface. An interference filter 5 for permeating the laser beam with the single wave length only is loaded to the CCD camera 3, and a driving device revolving the projector 4 and camera 3 in the horizontal, a picture input board taking in a picture taken by the camera 3 and a computer for processing picture/instrumentation of the picture of the picture input board are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crack measuring device in a borehole in which a camera is provided inside an end of a tubular pipe and the pipe is inserted into the borehole to measure cracks on the wall surface of the borehole.

[0002]

2. Description of the Related Art A borehole camera is known as an apparatus for measuring and recording the properties of underground rock. In this borehole camera, as shown in FIG. 7, a CCD camera (hereinafter referred to as a CCD camera) 19 is inserted into a tubular pipe 1, and a mirror 20 provided at the bottom is rotated to rotate the surrounding rock mass. This is for taking an image, and as shown in FIG.
There is one in which 9 is installed horizontally and the camera 19 itself is rotated. In the figure, reference numeral 2 is a transparent portion, 16 is a cable,
21 is a motor.

[0003]

However, according to the conventional technique, the measurer judges the condition of the bedrock from the photographed image or image, so that it is impossible to quantitatively measure the condition of the crack of the bedrock, for example. There was a problem.

Therefore, an object of the present invention is to provide a crack measuring device in a borehole capable of quantitatively measuring the condition of cracks and unevenness of rock mass.

[0005]

According to the present invention, a camera is provided inside the end of a tubular pipe, and the pipe is inserted into the bore hole to measure cracks on the wall surface of the bore hole. In the device, a CCD equipped with a projector that radiates a flat single-wavelength laser beam that spreads in a fan shape, and a filter that transmits only the laser beam that captures the location where the laser beam illuminates the wall surface A camera, a driving device that rotates the projector and the camera in a horizontal plane, a video input board that captures a video image captured by the camera, and a processing device that includes a computer that performs image / measurement processing on the video of the video input board Is provided.

[0006]

DESCRIPTION OF THE OPERATING FUNCTION The present invention is configured as described above, and the direction of the slit is parallel to the axis of the boring hole for the plane single wavelength laser light (hereinafter referred to as slit light) that spreads in a fan shape. When irradiating the inner surface of the hole as described above and photographing that portion with a CCD camera equipped with an interference filter that transmits only the wavelength, the surface unevenness in the cross section of the portion irradiated with laser light is photographed as a line drawing, The video is captured on the image input board of the processor. If the data of the optical arrangement of the projector and the camera is stored in the processing device in advance, it is calculated by the input data from the image input board, and the unevenness of the surface of the part irradiated with the laser light is used as quantitative measurement data. can get.

When the camera is rotated once by the driving device while photographing as described above, data on the same circumference can be obtained.
Further, if the pipe is moved up and down to take an image, the condition of the inner surface of the boring hole can be quantitatively measured over a required range in the axial direction of the boring hole.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a crack measuring device in a borehole according to the present invention. A transparent portion 2 is provided at a lower portion of a pipe 1 and a bottom plate 9 is attached to a lower end thereof.

A second CCD camera 3 and a laser projector 4 for irradiating slit light of a single wavelength in parallel with the axial direction of the pipe 1 are attached to the substrate 10 (see FIG. 2). The CCD camera 3 is equipped with an interference filter 5 that transmits only light having the same wavelength as the laser light emitted from the laser projector.

The base 10 is connected to a motor 7 provided on the bottom plate 9 via a speed reducer 8, and another speed reducer (not shown) having a different reduction ratio (for example, a first camera: a first camera) is provided below the base 10. The first CCD camera 6 is attached via the deceleration ratio of the second camera 50: 1), and these cameras and motors are connected to the ground processing unit 11 and a control unit (not shown) by a cable 16.

FIG. 2 shows a main part of the crack measuring device. The second CCD camera 3 is connected to the video input board 12 of the processing device 11 by the cable 16, and the video input board 12 is connected to the computer 13 by the electric circuit 15. It is connected.

Then, the first CCD camera 6 is input to another video input board (not shown), and the board 10 is driven by the motor 7.
Causes the first camera 6 to rotate at another rotation speed (50: 1 in this example).

Reference numeral A indicates slit light emitted from the projector.

Next, the mode of measurement will be described mainly with reference to FIG.

The slit light A is emitted from the laser projector 4 to the bedrock G.
(Step S1 and FIG. 4), and the second CCD camera 3 equipped with the interference filter 5 images the surface shape 17 of the rock G exposed to the slit light A (Step S2). Next, the image captured by the camera 3 is input to the video input board of the processing device 11 (step S3), and the input image is digitized, that is, the brightness is stored in the developing memory (step S4). Next, filtering processing, that is, noise processing, blurring processing, and thinning processing is performed to obtain a line-drawing image 17a as shown in FIG. 5 (step S5). Next, the filtered image 17a is scanned in the U-axis direction while being shifted in the V-axis direction (step S6), and u and v coordinates when the scanning value exceeds a preset threshold value are recorded ( Step S
7). Next, as shown in FIG. 6, the u and v coordinates are converted into three-dimensional coordinates (step S8), and the obtained three-dimensional coordinates are recorded together with the rotation angle θ of the camera 3 and the borehole depth H (step S9).

In the case of this example, the first CCD camera 6 rotates at a rotation speed of 50 times for normal photographing, so that the images in the vicinity of the above-mentioned line drawing are simultaneously photographed. To be done.

Therefore, if line drawing data is taken over 360 ° and the pipe 1 is moved up and down to collect the necessary range of data, it can be recorded quantitatively, and a normal image from the first camera 6 can be used as a reference. If it is analyzed, it becomes easy to determine the unevenness of the boring hole, that is, the state of cracks.

[0019]

Since the present invention is constructed as described above, it has the following excellent effects.

(1) The condition of the inner wall of the boring hole can be quantitatively measured from the images taken by the laser projector and the CCD camera.

(2) Since it can be controlled on the ground, the operation is simple and the cost is low.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a tip end portion of a crack geodesic device showing an embodiment of the present invention.

FIG. 2 is a drawing showing a main part of FIG.

FIG. 3 is a control flowchart of measurement.

FIG. 4 is a side view showing a state where the rock light is irradiated with slit light.

FIG. 5 is a diagram for explaining image scanning.

FIG. 6 is a perspective view illustrating three-dimensional coordinate conversion.

FIG. 7 is a side sectional view showing an example of a conventional technique.

FIG. 8 is a side sectional view showing another example of the conventional technique.

[Explanation of symbols]

 1 ... Pipe 2 ... Transparent part 3 ... 2nd CCD camera 4 ... Laser projector 5 ... Interference filter 6 ... 1st CCD camera 7, 21 ... Motor 8 ... Speed reducer 10 ... Board 11 ... Processing device 16 ... Cable 17 ... Surface shape 17a ... Image 19 ... CCD camera 20 ... Mirror

Claims (1)

[Claims] 1. A crack measuring device in a borehole, wherein a camera is provided inside an end portion of a tubular pipe, and the pipe is inserted into the borehole to measure cracks on the wall surface of the borehole. A CCD camera equipped with a projector that irradiates a laser beam of one wavelength and a filter that transmits only the laser beam that captures the position where the laser beam irradiates a wall surface, and the projector and the camera on a horizontal plane. Inside a borehole, which is provided with a driving device that rotates inside, a video input board that captures a video image captured by the camera, and a processing device that includes a computer that performs image / measurement processing of the video of the video input board Crack measuring device.