|Title of Invention||
"DEVICE FOR INSPECTING ANCHOR HOLES"
|Abstract||A device for inspecting anchor holes, which consists of a probe with an optical recording unit which is moved in a borehole with a push rod, characterized in that the anchor hole probe (1) is wireless, that is built as an independent probe, and consists of a video head (10) which has a colour CCD sensor (11) with a lens (12) equipped with a cone-shaped mirror (13), a viewing window and LEDs (15), a travel sensor (20), an electronics component (21), a memory module (22), and a battery section (23) on which an infrared interface is arranged and in that two position sensors (25,26) are arranged in the electronics component (21).|
|Full Text||The present invention relates to device for inspecting anchor holes.
The invention concerns a device for the investigation of anchor holes, which consists of a probe with an optical detection unit, which can be moved in the borehole with a push rod,
US 5,663,559 describes a method and a device for producing an image of an earth formation with petroleum prospecting boreholes.
EP 0 659 253 Bl discloses a borehole observation instrument for investigation of the interior of a borehole or shaft for petroleum prospecting boreholes.
WO 94/07147 A.1 concerns a method and a device for simultaneous video-based determination of the ground water direction of flow and speed for bore diameters greater than 2 inches.
The methods and devices disclosed in these publications are not suited for the inveatigation of anchor boles, because anchor holes are generally l to 2 inches in diameter.
From DE 199 25 733 C2 it is known that boreholes can be examined optically with an endoscope (borehole endoscopy).
In this endoscopy the wall of the borehole is visually inspected on-site; storage of the observation and a true spatial assignment of the mechanical microstructure data for rock is not possible.
It is the object of the invention to provide a device which enables the borehole wall of anchor holes to be recorded optically and to analyse the information thus obtained in such a way that a safety-relevant evaluation of the geological condition and an objective documentation is maintained during the heading.
This objective is accomplished by the characteristics of Claim 1.
Extensions are presented in the dependent claims.
The inventive anchor hole probe, which is implemented as a wireless, i.e. independent, probe, is guided in the anchor holes and makes an optical digital recording of the surface of the borehole and eaves it. This facilitates documentation of the wall of the borehole with which the true spatial situation of interfaces and layers can be determined by means of an evaluation program. The evaluation program enables convenient administration of the recorded data in a database, image processing and evaluation and interpretation of the borehole images.
For deployments in underground bituminous coal mining the anchor hole probe is implemented in an explosion-proof manner.
The position measurement is accomplished with the help of a contact wheel on which a motion sensor is arranged to determine the path. It is also feasible to record the motion of the probe directly with a motion sensor. This motion sensor emits radiant energy onto the borehole wall, and, reflections during the movement of the probe are recorded, from which the path is determined.
The integrated position sensors record the position of the probe in the borehole and saves it together with the image information. Determination of the true position of the interfaces is accomplished by the evaluation program taking into account the probe space position data.
The saved digital map of the surface of the borehole wall is used to reveal the structure and for analysis of lithologic and petrographic characteristics.
As part of this, the true spatial positions of the interfaces and their frequency distribution are determined for determination of the seatn bodies in the slope of a tunnel and/or in the ridge of a tunnel. The more frequent travel of the boreholes results in an optimized, independent and objective comparative information regarding the loosening distribution and condition of the tunnel ridge.
Using the evaluation program and database it is possible to compare the data of older investigations with the newer investigation results so that changes in the opening widths can be determined. This timely recognition of loosening zones enables action to be taken at an early Stage, This way, a safety evaluation of the geological
condition is possible at any time. Furthermore, clarification of the geological characteristics is o£ great importance in the planning and optimization of the tunnel extension and particularly for anchor dimensioning. If difficulties occur during heading, a quick documentation of the anchor hole can take place.
Power supply of the anchor hole probe is handled with conventional Mignon batteries. The images of the borehole wall are digitally recorded with a colour CCD sensor and saved in the probe. The memory is sufficient for several measurements, 30 the probe need not be read out after each measurement. The control and calibration of the anchor hole probe is handled via a high speed infrared interface integrated in the battery portion together with a mobile PC. The recorded data can also be read out via this infrared interface.
Usually the recordings made with the anchor hole probe are copied from the probe memory with a USB reader and imported by the software. Here a wizard supports the entry of specific additional information for the respective measurement. Possibilities include supplementary comments for data on borehole length and diameter and the assignment to locations and boreholes perhaps already defined as part of earlier measurements.
Furthermore, comprehensive options for graphical processing of the digital image data recorded by the probe are provided. Image options for the person doing the work include cropping, adjustment of the brightness, contrast, intensity and gamma value, sharpening, softening and smoothing. The images can be rotated on
their axes and aligned. In addition to that, there is a cleanup function for eliminating measurement artefacts.
with the help of the software, enough data for the bored rock mass can be determined from the borehole images. The determination of interface orientation is a semiautomatic process by "picking" (clicking) and assignment to the respective types of structures recognizable in the image (such as seam, layer surface). The true spatial situation of the interfaces can also be determined by the evaluation program by additional processing of the spatial position data for the probe. A lithologic description of the corresponding depth sections is likewise possible.
Thus as part of the evaluation the recognition of rock takes place and the definition of the limits and determination of the extent and degree of loosening zones. All data are archived in the database for documentation and Cor repeat measurements.
The structures are marked both in the image of the borehole wall and visually represented as a surface in various 3-D views. In this process, first 2-D forms are produced for individual measurement croeB-sections of the tunnel based on the borehole endoscopy; furthermore, the software permits a 3-D representation of the boreholes (location in the tunnel/segment/boring insufficiency with interface microstrueture).
with the image data and information for the borehole which are archived and managed in tne database (location, spatial position, dimensions, tunnel profile, etc.) a
comparison is possible between current measurement data and data from earlier measurements or data of boreholes nearby. This enables the determination of the type, extent, and period of occurrence of weak zones in the tunnel.
A preferred embodiment of the anchor hole probe is a wireless, independent optical probe with a diameter of 23 mm. This is suitable for digital recording of the borehole wall of boreholes with a diameter of 25 to 37 mm. Due to its small diameter and low weight, the probe can simply be inserted manually in the borehole using extension rods.
The borehole probe consists of a video head, travel sensor, electronics component, memory module and battery section which also contains an infrared interface. Monitoring of the investigations is facilitated by data transmission.
Image recording is controlled by the travel sensor, which provides depth measurement in addition to recording control and thus the possibility of exact measurement of structures, such as the interface spacing and RQD index determination, fissure opening width determination, layer thickness, etc.
The true spatial situation of the interface
microstructure can be determined by the position sensor
The invention is explained in more detail below based on an embodiment and a drawing. These show in:
Figure 1 a schematic representation of the method
for determination of the rock mass structure in the surrounding rock of the drift.
Figure 2 a cross section through the video head
Figure 3 an overall representation of the anchor
Figure 4 a schematic representation of the travel
Figure 5 a schematic representation of the video
head in a borehole
An anchor hole was investigated with a probe having the following specifications.
Power supply: 5 x Duracel MN 1500, 1.5 V
Memory: 256 MB
Probe length: 1,300 mm
Probe diameter: 23 mm
Probe weight: 2.2 kg
Sensor: colour CCD
Measurement rate: 25 images per second
Measurement speed: Max. 5 cm per second
Illumination: 8 white LEDs
Depth measurement: wheel-centrolled travel sensor
The probe was moved in the borehole using a push rod. The bars built into each coupling ensure good control of the
orientation of the probe in the borehole. The anchor hole probe scans an angle of 360 degrees, i.e. it records the entire borehole. In the two-dimensional map of the surface of the borehole wall, which corresponds to a cylinder surface, the borehole wall is shown in an unrolled projection. This causes planar structures, such as layer surfaces, seams, etc.), which are not exactly perpendicular to the axis of the borehole to appear ae sinusoidal lines in this view. With the help of the probe study, the true spatial situation and frequency of the wag able to be recorded and displayed.
Figure 1 shows a schematic representation of the method for investigation of anchor holes to determine the rock mags structure in the surrounding rock of the drift. An anchor hole probe 1 is run Into an anchor hole 2 using1 a push rod. In a tunnel 3 there are further anchor holes 21 arranged. This enables the structure of the rock mass 4 to be analysed by means of the anchor hole probe. The anchor hole probe 1 is located in the anchor hole 2 in the area of a. fissure 5. Using the video head, a two-dimensional map 6 of the surface of the borehole wall is digital recorded.
In Figure 2 it can be seen that a video head 10 has a colour CCD sensor 11 which is arranged with a lens 12. Using a cone-shaped mirror 13, an optical digital recording of the borehole wall, which is illuminated by the LEDs 15, can be made through the viewing window 14. There is a plug connection 16 arranged at the bottom of the video head 10.
Figure 3 shows the anchor hole probe I. It is made up of the video head 10, the travel sensor 20, an electronic component 21, a memory module 22 and a battery section 23, which also contains an infrared interface 24. There are two position sensors 25 and 26 arranged in the electronics component. The individual components of the anchor hole probe 1 are connected to each other by plug connections 16.
Figure 4 shows that the travel sensor 20 consists of three wheels 30, 30' and 30" on spring bearings, which are staggered 120 degrees with respect to each other. The wheel 30 has a motion sensor 31 to determine the travel of the anchor hole probe 1.
For reasons of space, the movement of the wheel 30 is transferred to toothed gears 32 and recorded by the motion sensor 31.
Figure 5 shows the video head 10 of the anchor hole probe 1 in the anchor hole 2. The remaining reference indicators have the same meaning as in Figure 2. The LEDs 15 produce a cone of light 35 to illuminate the borehole wall of the anchor hole 2, In the area of the beams 36 an optical digital recording of the borehole wall of the anchor hole 2 is made using the colour CCD sensor 11 dependent on the travel. This map of the borehole wall is saved using the evaluation program and investigated semi-automatically with menus, in this way the structure of the rock mass 4 is determined.
Drawing reference list
1 Anchor hole probe
2 Anchor hole
2' Anchor hole
4 Rock mass
6 Two-dimensional map
10 video head
11 Colour CCD sensor
13 Cone-shaped mirror
14 Viewing window
16 Plug connection
20 Travel sensor
21 Electronics component
22 Memory module
23 Battery section
24 Infrared interface
25 Position sensor
26 Position sensor
3 0 Wheel
31 Motion sensor
32 Toothed gears
35 Cone of light
3 6 Beams
1. A device for inspecting anchor holes, which consists of a probe with an optical recording unit which is moved in a borehole with a push rod, characterized in that the anchor hole probe (1) is wireless, that is built as an independent probe, and consists of a video head (10) which has a colour CCD sensor (11) with a lens (12) equipped with a cone-shaped mirror (13), a viewing window and LEDs (15), a travel sensor (20), an electronics component (21), a memory module (22), and a battery section (23) on which an infrared interface is arranged and in that two position sensors (25,26) are arranged in the electronics component (21).
2. A device as claimed in claim 1, wherein the travel sensor (20) consists of three wheels (30, 30', 30") with spring bearings staggered by 120 degrees and the wheel (30) has a motion sensor (31) for determining the travel distance.
3. A device as claimed in claim 1 and 2, wherein the travel sensor (20) is equipped with a motion sensor which records the probe movement immediately.
4. A device as claimed in claim 1 to 3, wherein the anchor hole probe (1) is of explosion-proof construction.
|Indian Patent Application Number||7211/DELNP/2006|
|PG Journal Number||38/2012|
|Date of Filing||30-Nov-2006|
|Name of Patentee||DEUTSCHE MONTAN TECHNOLOGIE GMBH|
|Applicant Address||AM TECHNOLOGIEPARK 1,45307 ESSEN,GERMANY|
|PCT International Classification Number||E21B 47/00|
|PCT International Application Number||PCT/EP05/005474|
|PCT International Filing date||2005-05-20|