AU2017317602B2 - Sound level meter-based tunnel roof rock Protodyakovnov coefficient detecting-while-drilling apparatus and method - Google Patents
Sound level meter-based tunnel roof rock Protodyakovnov coefficient detecting-while-drilling apparatus and method Download PDFInfo
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- AU2017317602B2 AU2017317602B2 AU2017317602A AU2017317602A AU2017317602B2 AU 2017317602 B2 AU2017317602 B2 AU 2017317602B2 AU 2017317602 A AU2017317602 A AU 2017317602A AU 2017317602 A AU2017317602 A AU 2017317602A AU 2017317602 B2 AU2017317602 B2 AU 2017317602B2
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- 238000005553 drilling Methods 0.000 title claims abstract description 106
- 239000011435 rock Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000000523 sample Substances 0.000 claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000004080 punching Methods 0.000 abstract description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 238000004873 anchoring Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 208000008918 voyeurism Diseases 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/003—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by analysing drilling variables or conditions
Abstract
Abstract The present invention discloses sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus and a method. Aiming at the detecting-while drilling problem of the important rock mechanics index--Protodyakonov coefficient affecting the anchoring and supporting scheme of the coal mine tunnel roof, drill holes of <D32~42mm are constructed in the tunnel roof, bearing type while-drilling apparatus with a sound level meter probe is arranged behind a drilling bit. A method of combining with the reading of a scale drill stem is used. In the drilling process, the volume decibel of drill holes with different depths is tested, the Protodyakonov coefficient of the rock within the range of the tunnel roof drill holes is obtained quickly by comparing with the volume decibel of the in-situ rock drilling in the tunnel in conjunction with the standard library of the rock Protodyakonov coefficient of 0.3 to 20 established in the laboratory, and harmful noise in the punching process is converted into useful sound source, thereby achieving the detecting-while-drilling technology. It is suitable for the detecting while drilling of the Protodyakonov coefficient of sandstone, shale, mudstone and other typical deposited rock strata of coal measure strata. It has the advantages of convenient use on site, simple operation, low labor intensity and no influence on normal production.
Description
Description
Sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus and method
I. Field of the Invention
The present invention relates to a detecting-while-drilling apparatus and a method, which belong to the technical field of mine tunnel support, and particularly relates to sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus and method which are suitable for the geological conditions under which the space between bedding planes between rock strata with different lithological characters at the tunnel roof of the coal mine is small.
II. Background of the Invention
Tunnel support is a key technology for the safety mining of coal. There is a considerable proportion of roof accidents in mine disasters, resulting from insufficient support strength caused by failure to timely ascertaining the lithological characters of local roof. Hence, during the tunnel construction, it is necessary to timely ascertain the lithological characters of the tunnel roof. For the area where potential accident of roof fall exists, the support way should be timely changed or the support parameter is adjusted to ensure the safety and stability of the roof.
At present, the method for detecting the lithological characters of the local roof of the tunnel mainly includes the core taking method, the drill hole wall impression method, the drill hole wall observation method and geological radar detection and so on. For the core taking method, coring is carried out on the roof with the geological core drill, the lithologic characters of the roof are analyzed according to the columnar structure of the core, however, the geological drilling rig is not applicable to operation on the advancing working face and cannot be used at any time anywhere with the advancing of the development machine owing to its large volume. For the drill hole wall impression method, some plastic materials with no liquidity and elasticity are bound to the drill hole surfaces, the inner counters of the drill holes to be detected are copied into impression, and the impression is measured to evaluate the inner structures of the drill holes to be detected, however, such method neither measures the lithologic characters of the roof nor provides scientific and effective data for the design of the support way. For the drill hole wall observation method, scenes inside the drill holes are directly shot via the probe by using the rock stratum detection recorder and other devices, however, under the influence of the environment of underground coal mine, the obtained error of parameters of the roof surrounding rock structure is larger owing to low peeping accuracy. The geological radar detection is the electromagnetic technology in which different media in the roof rock strata are discriminated accurately and positioned in interfaces based on the difference in the electrical properties of detected media, such method is insufficient in disclosure degree to joint and fracture development and cannot effectively identify the lithologic characters of rock strata at the tunnel roof, but it is the key and difficult points in the design and construction of the tunnel support. Hence, aiming at the combined characteristics of rock strata at the roof of the coal mine, there is an urgent need to develop a method for adapting to the environment of underground coal mine and quickly identifying the lithological characters of the roof.
Any discussion of documents, acts, materials, devices, articles or the like which have been included in the present specification is not to be taken as an admission that any or all of these
2017317602 15 Jul 2019 matters form part of the prior art base or were common general knowledge in the field relevant to the present invention as it existed before the priority date of each claim of this application.
Throughout the specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
III. Summary of the Invention
Technical problem: aiming at the above-mentioned technical problems, the sound level meterbased tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus in accordance with an embodiment of the invention which is simple in structure, easy to use and operate and low detection intensity and acquires the rock Protodyakonov coefficient of the tunnel roof via noise generated in the drilling process and the method thereof are provided.
Technical solution: in order to fulfill the above-mentioned purpose, the sound level meterbased drilling apparatus for detecting the Protodyakonov coefficient of a tunnel roof rock while drilling in accordance with embodiments of the present invention comprises a bearing type drilling apparatus, an individual roof bolter, a sound level meter and a drill stem, wherein the individual roof bolter is vertically arranged on the tunnel bottom plate; the top of the individual roof bolter is provided with the bearing type drilling apparatus drilling into the tunnel roof via the drill stem; and the bearing type drilling apparatus is connected with the sound level meter via the connecting wire.
The bearing type drilling apparatus comprises sound level meter probes, conical members, a silent bearing and a drilling bit which are arranged on the drill stem, wherein the drilling bit is arranged on the top of the scale drill stem; the silent bearing is arranged on the drill stem below the drilling bit; a plurality of conical members are arranged on the silent bearing; the sound level meter probes are arranged on the conical members; and the sound level meter probes are connected with the sound level meter via the connecting wire.
The inner diameter of the silent bearing is 15 to 25mm, and the outer diameter is 25 to 35mm; and the inner diameter is in welded connection with the scale drill stem, and the outer diameter is in welded connection with the conical members.
The individual roof bolter is a hydraulic type or a pneumatic type; the drill stem may be ascale drill stem indicating a distance measurement scale, and the length of the scale drill stem is lm; a groove with the height of 1cm and depth of 1mm is machined from top to bottom at intervals of 10cm; a reflective coating is arranged on the surface of the scale drill stem; and stripes with red, orange, yellow, green, cyan, blue, purple, black and white are sprayed inside the groove from top to bottom along the drilling direction, wherein the length of Li is 100cm, and the length of L2 is 10cm.
A sound level meter-based drilling method for detecting a Protodyakonov coefficient of a tunnel roof rock while drilling is characterized by comprising the following steps of:
a. Establishing the standard library of the Protodyakonov coefficient of 0.3 to 20 of the rock in mine: selecting the coring site in the tunnel of the same coal bed, drilling rocks at different layers within the range of 20m at the roof coring site, machining and combining to a standard test sample according to Measurement Method of Physical and Mechanical Properties of Coal and Rock, carrying out the drilling experiment in the laboratory by using the roof bolter and the drilling bit with respect to different combinations of rocks with cores Protodyakonov coefficients of 0.3 to 20, recording the decibel of noise in the process of drilling the standard test sample with the test drilling bit by using the sound
2017317602 15 Jul 2019 level meter, and carrying out the drilling test on all standard test samples to obtain the range of noise decibel of the standard test sample of the rock with different Protodyakonov coefficients of 0.3 to 20 in the drilling process;
b. Starting the individual roof bolter, making the individual roof bolter drive the bearing type drilling apparatus via the drill stem to drill into the drill holes in the tunnel roof, the sound level meter starting to run, acquiring the noise decibel of the bearing type drilling apparatus in the drilling of the tunnel roof and the dynamic curve of decibel; stopping drilling by drilling every 10cm in conjunction with the reading of the scale drill stem, artificially reading the decibel range in the sound level meter, and comparing with the standard library of rock Protodyakonov coefficient of 0.3 to 20 established based on the mine to obtain the firmness coefficient of rock and drilling distance within the range; in case of sufficient length of the scale drill stem, additionally arranging the extended scale drill stem at the tail end;
c. repeating the step b to obtain the firmness coefficient of the rock within the range of the roof drill hole.
Beneficial effects: according to embodiments of the drilling method, noise generated in the punching process of the roof bolter is converted into beneficial sound source, achieving the real-time and continuous detection of the firmness coefficient of roof rock. The bearing type drilling apparatus with the sound level meter probe is arranged behind the drilling bit; the decibel of drill holes volume with different depths is tested in the drilling process in conjunction with the reading of the scale drill stem, and the rock Protodyakonov coefficient within the drilling range of tunnel roof is quickly obtained by comparing with the volume decibel of the drilling rock of the tunnel in situ in conjunction with the standard library of rock Protodyakonov coefficient of 0.3 to 20 established by the laboratory. Harmful noise in the punching process is converted into the beneficial sound source to timely adjust the support parameter according to local conditions with change in the firmness coefficient of the local roof rock in the detectingwhile-drilling process, and support is enhanced or the support effect is reduced properly to effectively avoid support waste and roof fall caused by insufficient support strength during production, thereby providing safe and reliable operating environment for coal miners. The method has the advantages of convenience for site use, easiness in operation, low labor intensity and no influence on normal production.
IV. Brief Description of Accompanying Drawings
Fig.l is a schematic structural diagram of the plane layout of an embodiment of the invention;
Fig.2 is a schematic diagram of the bearing type while-drilling apparatus of an embodiment of the invention;
Fig.3 is a schematic diagram of the scale drill stem of an embodiment of the invention;
In the Figures, 1-Bearing type while-drilling apparatus; 2-Individual roof bolter; 3-Sound level meter, 4-Scale drill stem; 5-Tunnel roof; 6-Tunnel bottom plate; 7-Sound level meter probe; 8Conical member; 9-Silent bearing; 10-Drilling bit; 11-Drill hole; 12-Connecting wire.
V. Detailed Description of the Embodiments
Hereunder the present invention will be further detailed in an embodiment with reference to the accompanying drawings.
As shown in the Fig.l, the sound level meter-based drilling apparatus for detecting a Protodyakonov coefficient of a tunnel roof rock while drilling of an embodiment of the invention comprises bearing type drilling apparatus 1, an individual roof bolter 2, a sound level
2017317602 15 Jul 2019 meter 3 and a drill stem, wherein the individual roof bolter 2 is vertically arranged on the tunnel bottom plate 6; the top of the individual roof bolter 2 is provided with the bearing type whiledrilling apparatus 1 drilling into the tunnel roof 5 via the scale drill stem 4; and the bearing type while-drilling apparatus 1 is connected with the sound level meter 3 via the connecting wire 12.
As shown in the Fig.2, the bearing type while-drilling apparatus 1 comprises sound level meter probes 7, conical members 8, a silent bearing 9 and drilling bit 10 which are arranged on the drill stem, wherein the drilling bit 10 is arranged on the top of the scale drill stem 4; the silence bearing 9 is arranged on the drill stem below the drilling bit 10; a plurality of conical members 8 are arranged on the silence bearing 9; the sound level meter probes 7 are arranged on the conical members 8; and the sound level meter probes 7 are connected with the sound level meter 3 via the connecting wire 12. The inner diameter of the silence bearing 9 is 15 to 25mm, and the outer diameter is 25 to 35mm; and the inner diameter is in welded connection with the scale drill stem 4, and the outer diameter is in welded connection with the conical members 8.
As shown in the Fig. 3, the individual roof bolter 2 is a hydraulic type or a pneumatic type; the drill stem is the drill stem 4 showing a distance measurement scale, and the length of the scale drill stem 4 is lm; a groove with the height of 1cm and depth of 1mm is machined from top to bottom at intervals of 10cm; reflective coating is arranged on the surface of the scale drill stem 4; and stripes with red, orange, yellow, green, cyan, blue, purple, black and white are sprayed inside the groove from top to bottom along the drilling direction, wherein the length of Li is 100cm, and the length of L2 is 10cm.
A sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling method is characterized by comprising the following steps of:
a. Establishing the standard library of the Protodyakonov coefficient of 0.3 to 20 of the rock in mine: selecting the coring site in the tunnel of the same coal bed, drilling rocks at different layers within the range of 20m at the roof coring site, machining and combining to a standard test sample according to Measurement Method of Physical and Mechanical Properties of Coal and Rock, carrying out the drilling experiment in the laboratory by using the roof bolter and the drilling bit with respect to different combinations of rocks with cores Protodyakonov coefficient of 0.3 to 20, recording the decibel of noise in the process of drilling the standard test sample with the test drilling bit by using the sound level meter, and carrying out the drilling test on all standard test samples to obtain the range of noise decibel of the standard test sample of the rock with different Protodyakonov coefficients of 0.3 to 20 in the drilling process;
b. Starting the individual roof bolter 2, making the individual roof bolter 2 drive the bearing type while-drilling apparatus 1 via the drill stem to drill into the drill holes 11 in the tunnel roof 5, the sound level meter 3 starting to run, acquiring the noise decibel of the bearing type while-drilling apparatus 1 in the drilling of the tunnel roof 5 and the dynamic curve of decibel; stopping drilling by drilling every 10cm in conjunction with the reading of the scale drill stem 4, artificially reading the decibel range in the sound level meter 3, and comparing with the standard library of rock Protodyakonov coefficient of 0.3 to 20 established based on the mine to obtain the firmness coefficient of rock and drilling distance within the range; comparing with the standard library of rock Protodyakonov coefficient of 0.3 to 20 according to the measured decibel at drilling by 0.1m to determine the firmness coefficient of rock within the distance of 0.1m in the drill hole; according to different firmness coefficients of roof rock, modifying the support parameter timely, for example, when the rock within local roof is soft (such as mudstone), the support needs to be enhanced, and increase the density of bolt support to ensure roof stability; when the rock within local roof is hard (such as sandstone), the array pitch between the bolt supports can be appropriately increased, the support requirement can be met, and meanwhile, material waste is reduced, thereby achieving the tunnel support according to local conditions;
in case of insufficient length of the scale drill stem 4, additionally arranging the extended scale drill stem 4 at the tail end;
c. Repeating the step b to obtain the firmness coefficient of the rock within the range of the roof drill hole 11.
Claims (4)
1. A sound level meter-based drilling apparatus for detecting a Protodyakonov coefficient of a tunnel roof rock while drilling, the drilling apparatus comprising a bearing type drilling apparatus, an individual roof bolter, a sound level meter and a drill stem, wherein the individual roof bolter is vertically arranged on a tunnel bottom plate, a top of the individual roof bolter is connected with the bearing type drilling apparatus drilling into a tunnel roof via a drill stem, and the bearing type drilling apparatus is connected with the sound level meter via a connecting wire, wherein the bearing type drilling apparatus comprises sound level meter probes, conical members, a silent bearing and drilling bit which are arranged on the drill stem, wherein the drilling bit is arranged on the top of the drill stem; the silent bearing is arranged on the drill stem below the drilling bit; a plurality of conical members are arranged on the silent bearing; the sound level meter probes are arranged on the conical members; and the sound level meter probes are connected with the sound level meter via the connecting wire.
2. The sound level meter-based drilling apparatus according to claim 1, wherein, an inner diameter of the silent bearing is 15 to 25mm, and the outer diameter is 25 to 35mm; and the inner diameter is in welded connection with the drill stem, and the outer diameter is in welded connection with the conical members.
3. The sound level meter-based drilling apparatus according to claim 1 or 2, wherein the individual roof bolter is a hydraulic type or a pneumatic type; , and the length of the drill stem is lm; a groove with the height of 1cm and depth of 1mm is machined from top to bottom at intervals of 10cm ; reflective coating is arranged on the surface of the drill stem; and stripes with red, orange, yellow, green, cyancran, blue, purple, black and white are sprayed inside the groove from top to bottom along the drilling direction, wherein the length of LI is 100cm, and the length of L2 is 10cm.
4. A sound level meter-based drilling method for detecting a Protodyakonov coefficient of a tunnel roof rock while drilling using the apparatus of claim 1, the drilling method comprising the following steps of:
a. Establishing the standard library of the Protodyakonov coefficient of 0.3 to 20 of the rock in mine: selecting the coring site in the tunnel of the same coal bed, drilling rocks at different layers within the range of 20m at the roof coring site, machining and combining to a standard test sample according to Measurement Method of Physical and Mechanical Properties of Coal and Rock, carrying out the drilling experiment in the laboratory by using the roof bolter and the drilling bit with respect to different combinations of rocks with core Protodyakonov coefficient of 0.3 to 20, recording the decibel of noise in the process of drilling the standard test sample with the test drilling bit by using the sound level meter, and carrying out the drilling test on all standard test samples to obtain the range of noise decibel of the standard test sample of the rock with different Protodyakonov coefficients of 0.3 to 20 in the drilling process;
b. Starting the individual roof bolter, making the individual roof bolter drive the bearing type
2017317602 15 Jul 2019 drilling apparatus via the drill stem to drill into the drill holes in the tunnel roof, the sound level meter starting to run, acquiring the noise decibel of the bearing type drilling apparatus in the drilling of the tunnel roof and the dynamic curve of decibel; stopping drilling by drilling every 10 cm in conjunction with the reading of the drill stem, artificially reading the decibel range in the sound level meter, and comparing with the standard library of rock Protodyakonov coefficient of 0.3 to 20 established based on the mine to obtain the firmness coefficient of rock and drilling distance within the range; in case of insufficient length of the drill stem, additionally arranging the extended drill stem at the tail end; and
c. Repeating the step b to obtain the firmness coefficient of the rock within the range of the roof drill hole.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611101992.2A CN106593424B (en) | 2016-12-05 | 2016-12-05 | Back rock Protodyakonov coefficient based on sound level meter is with brill detection method |
| CN2016111019922 | 2016-12-05 | ||
| PCT/CN2017/091610 WO2018103325A1 (en) | 2016-12-05 | 2017-07-04 | Sound level meter-based measurement while drilling device and method for obtaining protodikonov's hardness coefficient of rock of tunnel roof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2017317602A1 AU2017317602A1 (en) | 2018-06-21 |
| AU2017317602B2 true AU2017317602B2 (en) | 2019-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| AU2017317602A Active AU2017317602B2 (en) | 2016-12-05 | 2017-07-04 | Sound level meter-based tunnel roof rock Protodyakovnov coefficient detecting-while-drilling apparatus and method |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN106593424B (en) |
| AU (1) | AU2017317602B2 (en) |
| CA (1) | CA2997155C (en) |
| RU (1) | RU2688714C1 (en) |
| WO (1) | WO2018103325A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593424B (en) * | 2016-12-05 | 2019-09-10 | 中国矿业大学 | Back rock Protodyakonov coefficient based on sound level meter is with brill detection method |
| CN107387060A (en) * | 2017-09-11 | 2017-11-24 | 中国矿业大学 | One kind instructs fully mechanized mining machine top coal recovery method |
| CN110219642B (en) * | 2019-04-26 | 2022-10-14 | 中国石油化工股份有限公司 | Sound wave time difference correction method based on sound wave propagation path |
| CN110486007B (en) * | 2019-08-29 | 2023-02-03 | 武汉长盛煤安科技有限公司 | In-situ testing device and method for mechanical parameters of coal mine surrounding rock while drilling |
| CN112360527A (en) * | 2020-11-11 | 2021-02-12 | 中国矿业大学 | Anchoring agent compaction device, anchor rod and using method |
| CN113216864A (en) * | 2021-05-06 | 2021-08-06 | 六盘水师范学院 | Drilling device for tunnel roof rock property components |
| CN113503153A (en) * | 2021-09-13 | 2021-10-15 | 四川交达预应力工程检测科技有限公司 | Self-adaptive drilling hole-forming method and system |
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2016
- 2016-12-05 CN CN201611101992.2A patent/CN106593424B/en active Active
-
2017
- 2017-07-04 WO PCT/CN2017/091610 patent/WO2018103325A1/en active Application Filing
- 2017-07-04 RU RU2018110400A patent/RU2688714C1/en active
- 2017-07-04 AU AU2017317602A patent/AU2017317602B2/en active Active
- 2017-07-04 CA CA2997155A patent/CA2997155C/en active Active
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| JPS63304899A (en) * | 1987-06-05 | 1988-12-13 | 古河機械金属株式会社 | Method of executing lock bolt |
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| CN105937402A (en) * | 2016-04-28 | 2016-09-14 | 湖南科技大学 | Anchor bolt supporting system with self-drilling type recognizable loose surrounding rock drill bit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106593424A (en) | 2017-04-26 |
| AU2017317602A1 (en) | 2018-06-21 |
| CA2997155C (en) | 2019-06-18 |
| CA2997155A1 (en) | 2018-06-05 |
| WO2018103325A1 (en) | 2018-06-14 |
| RU2688714C1 (en) | 2019-05-22 |
| CN106593424B (en) | 2019-09-10 |
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