JP2001098880A - Method and apparatus for surveying pit wall surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a working period required for survey. SOLUTION: According to this procedure, when it is determined in step 1 that excavation by an excavator is ended and excavation much is completely taken out, a survey apparatus is lowered in step 2. When the survey apparatus is lowered to a prescribed location, the survey apparatus is installed in the location, and automatic horizontal adjustment is carried out by means of a leveling stand in step 3. When the installation is completed, an image pickup angle, focus, etc., of a digital camera are adjusted to pick up an image, in step 4. Next, the digital camera 22 is rotated to carry out image pickup by a prescribed angles, along a baserock wall surface 14 of a pit 12, and then the digital camera 22 is lowered by a prescribed distance, following the repeated operation in the step 4 and this operation in step 5. With respect to the image pickup information thus obtained, image data are taken backed to office, which are then coupled to each other in step 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for investigating a shaft wall, and more particularly, to a method and apparatus for continuously obtaining digital image information in the circumferential direction of a shaft wall.

[0002]

2. Description of the Related Art When constructing a headrace of an underground power plant, a ventilation tunnel of a highway tunnel, or an access tunnel of a high-level radioactive waste disposal site, these headraces or tunnels are installed in rock. The shaft may be formed almost vertically in the bedrock.

[0003] When constructing such a shaft, the rock wall surface of the excavated shaft is inspected to determine the state of cracks in the rock and the state of spring water, as in the case of ordinary tunnel construction in which excavation proceeds almost horizontally. Knowing the geology is very important for determining the progress of excavation.

However, the conventional method of examining the rock excavation wall surface has been carried out by visual observation or photography using a silver halide film, but has the following problems.

[0005]

That is, first of all, the survey method using only visual observation requires a great deal of time for observation. However, in this type of construction, the geological observation can be performed only when the lining construction is performed immediately after the start of the sliding. Just before, it is very difficult to secure such time for visual observation during work.

[0006] Even when visual observation and photographing are used together, the results of visual observation and photographing may not be consistent, making it difficult to accurately recognize the geology of the rock wall surface.

The present invention has been made in view of such conventional problems, and has as its object to reduce the working time and obtain quantitative data such as crack width, direction, and inclination. Accordingly, an object of the present invention is to provide a method and an apparatus for investigating a shaft wall surface, which can accurately recognize the geology of a rock wall surface.

[0008]

Means for Solving the Problems To achieve the above object, the present invention provides a digital camera for taking an image of the excavated rock wall surface when performing a geological survey of the excavated rock wall surface,
An investigation device equipped with an auto gyro for controlling the rotation and movement of the digital camera was suspended and installed in the shaft, and the digital camera was rotated to image the rock wall surface. Further, the present invention is an apparatus for investigating a shaft wall surface which is suspended and installed in the shaft, when performing a geological survey of the excavated shaft rock wall surface, and a digital camera for imaging the rock surface. An auto gyro for controlling the rotational movement of the digital camera is mounted, and the digital camera is rotated to take images around the rock wall surface. According to the inspection method and the inspection apparatus for the shaft wall configured as described above, when the digital camera is rotated to take an image around the rock wall surface, digital image information for recognizing the geology of the rock wall surface is obtained in a short time,
By performing image processing on the captured image information, a developed view of the wall surface and a three-dimensional columnar figure can be obtained.
Based on the three-dimensional column diagram, quantitative data such as the crack width, direction, and inclination of the wall can be obtained, and the geology of the rock wall can be recognized more accurately. In the shaft wall survey device, the digital camera can be configured such that the focal length and the photographing angle can be adjusted by remote control.
According to this configuration, it is possible to remotely control the digital camera from outside the shaft to take a circular image of the rock wall surface.
The vertical shaft wall survey device may include a leveling table that is automatically adjusted to be horizontal, and the digital camera and the automatic gyro may be mounted on the leveling table. According to this configuration, when the suspended surveying device is set at a predetermined position, the leveling table equipped with the digital camera and the auto gyro is automatically leveled.
Imaging by a digital camera can be performed more quickly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIGS. 1 to 3 show an embodiment of a method and apparatus for investigating a shaft wall according to the present invention.

The survey device 10 shown in FIG. 1 is used for recognizing the geology of the rock wall surface 14 at the lower end of a shaft 12 constructed almost vertically. The shaft 12 excavates the rock at the lower end to a predetermined depth and discharges excavation debris. Then, a lining layer 16 is sequentially formed on the rock wall 14 at the portion where the excavation has been completed. The same operation is repeated up to the required depth.

For forming the lining layer 16, for example, shotcrete or annular precast segment is used. In FIG. 1, a state in which the construction of the shaft 12 has progressed to some extent is shown in cross section. Inside the shaft 12, a step-like work scaffold 18 is suspended and installed, and at the lowest stage of the work scaffold 18, An excavator 20 for rock excavation is mounted.

The investigation device 10 for the rock wall surface 14 includes a shaft 12
Is suspended almost on the central axis. FIG. 2 shows details of the investigation device 10 of the present embodiment. Bedrock wall 12
In the survey, discontinuous plane distribution (direction and inclination) such as cracks,
Extraction of spring water conditions and weathering conditions are important requirements.

In this case, in order to extract a crack, high-resolution observation is required from the viewpoint of resolution, and it is necessary to judge the color information of the object in order to extract a spring water state or a weathering state. .

Therefore, in order to satisfy such a need, the survey apparatus 10 employs a high-resolution digital camera 22 capable of obtaining color images. Also,
Since it takes time and is cumbersome for a person to take a picture every one excavation cycle, it is possible to automate the process from installation of the digital camera 22 to photography.

That is, the investigation device 10 of the present embodiment includes a digital camera 22 with a lightwave distance meter, a zoom lens 24 for adjusting the size of the image taken by the camera 22, a vertical encoder 26, a horizontal encoder 28, and an autogyro. 30.

The auto gyro 30 controls the attitude, such as rotation and azimuth, of the digital camera 22 mounted on the upper side thereof based on the detection values of the vertical and horizontal encoders 26, 28, and controls the lower side thereof. It is mounted on the arranged leveling table 32.

The leveling table 32 has a structure in which the level is automatically maintained, and is mounted on a disk-shaped support table 34 below the leveling table 32. A substantially U-shaped hanging bracket 36 is fixed to the side surface of the support base 34, and a weight base 38 for maintaining the overall balance of the investigation device 10 is attached to the lower surface side.

The investigation device 10 is suspended and supported by locking the wire 39 to the suspension fitting 36. The portion indicated by reference numeral 42 in FIG.
Reference numeral 44 denotes a gyro monitor for displaying the control state of the auto gyro 30 when the operation panel is operated manually without automatically.

Reference numeral 46 denotes a measured value monitor of the digital camera 22. Investigation device 10 having the above configuration
For example, a digital camera 22 having a CCD element having 6 million pixels is used as the digital camera 22. For level adjustment, encoder rotation, photographing (focus, exposure, zoom), etc., the leveling table 32, light wave distance By combining the meter and the auto gyro 30, automatic imaging including the imaging position and the azimuth can be performed.

Then, the digital camera 22 is rotated, and, for example, an image is taken such that about 4 to 6 images cover one round.

FIG. 3 shows an example of a procedure of a method for performing a geological survey of the rock wall surface 14 using the survey apparatus 10 of the present embodiment. In the procedure shown in the figure, first, in step 1, when it is determined that the excavation by the excavator 20 has been completed and the removal of the excavated waste has been completed, in step 2, the investigation device 1
A descent of zero is performed.

When the surveying device 10 is lowered to a predetermined position, that is, to the upper end side of a newly excavated position where the rock wall surface 14 is exposed, the surveying device 10 is installed at that position, and the leveling table 32 is used. Automatic leveling is performed (step 3).

With respect to the lowered position of the survey device 10, that is, the descending depth, for example, the position can be measured by measuring the amount of extension of the wire 39 for suspending and supporting the device 10 by using an encoder or the like. If ten installation positions are input, the device can be automatically installed at the set position.

When the installation of the survey device 10 is completed, a control signal is transmitted by remote control from outside the mine to adjust the angle of view, focus, and the like of the digital camera 22, and the digital camera 22 is now facing. The rock wall surface 14 is imaged (step 4).

When the imaging of one image is completed, the digital camera 22 is rotated by the horizontal encoder 26 while confirming the angle, and the imaging is repeatedly performed at predetermined angular intervals. , The digital camera 22 is lowered by a predetermined distance, and the operation of step 4 and this operation are repeated (step 5).

In this case, the number of repetitions of steps 4 and 5 is determined by one angle of view of the digital camera 22, for example, the rock wall 1 in the depth direction of one excavation cycle.
If the imaging of 4 is possible at one shooting angle of view, it is not necessary to repeat the operations of Steps 4 and 5; otherwise, the imaging of the rock wall surface 14 in the depth direction of one excavation cycle becomes possible if two operations are not enough. Is repeated until.

Since the imaging information obtained as described above constitutes one round of the rock wall surface 14 with, for example, 4 to 6 pieces, the image data is brought back to the office and the image data is joined. (Step 6).

In the image processing performed here, a plurality of obtained image data are taken into a computer, and the image data are connected to create a wall surface development diagram or a three-dimensional columnar diagram.

According to the method and apparatus for investigating a shaft wall constructed as described above, the digital camera 22
Rotation of the rock surface image around the rock wall surface 14 provides information for recognizing the geology of the rock wall surface 14 in a short time, and image processing of the captured image information also provides a developed view of the wall surface. Then, based on the obtained development, quantitative data such as the crack width, direction, and inclination of the wall surface 14 is obtained, and the geology of the rock wall surface 14 can be more accurately recognized.

In the investigation device 10 of the present embodiment, the digital camera 22 is configured so that the focal length and the photographing angle can be adjusted by remote control.
The digital camera 22 can be remotely operated from the outside of the shaft 12 to take a circular image of the rock wall surface 14.

Further, the surveying apparatus 10 of the present embodiment includes a leveling table 32 that is automatically adjusted to be horizontal, and the digital camera 22 and the auto gyro 30 are connected to
, So that it is suspended and installed.
Is set to a predetermined position, the leveling table 32 equipped with the digital camera 22 and the auto gyro 30 is automatically adjusted to be horizontal, so that the digital camera 22 can perform imaging more quickly.

[0032]

As described in detail above, according to the method and apparatus for investigating a shaft wall according to the present invention, it is possible to obtain a quantitative data such as a crack width, a direction, an inclination and the like in a short working time. This makes it possible to accurately recognize the geology of the rock wall surface.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory side view of an installation state of an installation method and an inspection apparatus for a shaft wall according to an embodiment of the present invention.

FIG. 2 is an enlarged detailed view of the investigation device of FIG. 1;

FIG. 3 is a flowchart illustrating an example of a work procedure when a survey is performed using the survey device illustrated in FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 investigation device 12 shaft 14 rock wall surface 22 digital camera 30 autogyro 32 leveling table

Claims (4)

[Claims] 1. A digital camera for imaging a rock wall surface when performing a geological survey of an excavated shaft rock wall surface,
Investigation of a shaft wall surface, wherein an inspection device equipped with an auto gyro for controlling the rotation movement of the digital camera is suspended and installed in the shaft, and the digital camera is rotated to image around the rock wall surface. Method. 2. A survey device for a shaft wall suspended from the shaft when performing a geological survey on an excavated rock bed wall, comprising: a digital camera for imaging the rock wall surface; An investigation apparatus for a shaft wall surface, comprising: an autogyro for controlling a rotational movement of a camera; and rotating the digital camera to image around the rock wall surface. 3. The investigation apparatus according to claim 2, wherein the digital camera is configured so that a focal length and a photographing angle can be adjusted by remote control. 4. The leveling device according to claim 2, wherein the surveying device includes a leveling table that is automatically leveled, and the digital camera and the autogyro are mounted on the leveling table. Investigation equipment for shaft walls.