CN109519131B - Self-anchoring, self-sealing hole and waste water recovery sleeve for cavitation jet flow - Google Patents
Self-anchoring, self-sealing hole and waste water recovery sleeve for cavitation jet flow Download PDFInfo
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- CN109519131B CN109519131B CN201910013568.XA CN201910013568A CN109519131B CN 109519131 B CN109519131 B CN 109519131B CN 201910013568 A CN201910013568 A CN 201910013568A CN 109519131 B CN109519131 B CN 109519131B
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- self
- inner sleeve
- sleeve
- sleeve body
- outer sleeve
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- 238000007789 sealing Methods 0.000 title claims abstract description 55
- 239000002351 wastewater Substances 0.000 title claims abstract description 39
- 238000004873 anchoring Methods 0.000 title claims abstract description 34
- 238000011084 recovery Methods 0.000 title claims abstract description 32
- 210000004907 gland Anatomy 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims description 14
- 239000003245 coal Substances 0.000 description 13
- 238000005065 mining Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a self-anchoring and self-sealing hole for cavitation jet flow and a wastewater recovery sleeve, which comprise an outer sleeve assembly, an inner sleeve assembly and a gland, wherein the inner sleeve assembly is screwed inside the outer sleeve assembly, the rear end part of the inner sleeve assembly extends out of the outer sleeve assembly, the gland is fixed at the rear end part of the outer sleeve assembly and is pressed with the inner sleeve assembly, a water return groove is arranged on the joint surface of the inner sleeve assembly and the gland, a water return port communicated with the water return groove is arranged on the gland, and the water return port is connected with a wastewater recovery system. The invention can be arranged on a cavitation jet drill rod for use and can also be used independently, can realize the functions of self-anchoring, self-sealing and waste water recovery, effectively prevents secondary disasters caused by gas outburst, has convenient operation of waste water recovery, self-anchoring and self-sealing, novel structure and ingenious conception, and has good application prospect.
Description
Technical Field
The invention relates to the technical field of coal seam mining equipment, in particular to a self-anchoring and self-sealing hole for cavitation jet flow and a wastewater recovery sleeve.
Background
At present, coal is still the main energy source of China, and ensuring the safe production of coal mines is an important guarantee for sustainable development of national economy. As most of domestic mines enter a deep mining period, the increase of the burial depth of the coal bed increases the ground stress in the coal bed, the gas content and the gas pressure are continuously increased, and the air permeability of the coal bed and surrounding rock is reduced, so that the hidden danger of coal and gas outburst of the coal bed is increased. According to statistics, coal seams with high gas content of over 95% and protruding mine exploitation belong to low-permeability coal seams, so that the influence range of gas exploitation is small, the attenuation speed is high, the exploitation difficulty is high, and most mine areas do not have protective layer exploitation conditions, so that the conventional gas exploitation technology cannot effectively solve the problem of increasing the permeability of a coal reservoir, the mine gas exploitation rate is directly caused to be low, the proportion of drilling, drainage and exploitation is unbalanced, and potential safety hazards exist.
Therefore, certain pressure relief and permeability improvement measures are needed to be adopted, the air permeability of the coal seam is increased, the gas drainage effect is improved, and the occurrence of the accident of protruding mining working faces can be effectively reduced. To above-mentioned problem, in order to better use the drilling rod sleeve pipe, realize from anchor, from sealing the hole, waste water is retrieved and protection gas outstanding secondary disaster that arouses, moreover, sleeve pipe exclusive use or supporting cavitation efflux drilling rod use, the installation is retrieved conveniently, is the problem that needs to solve at present.
Disclosure of Invention
The invention aims to solve the problems that the existing casing pipe for the drill rod cannot realize pressure relief and reflection prevention measures and the occurrence of the accident of protruding mining working face is reduced. The self-anchoring and self-sealing hole for cavitation jet and the waste water recovery sleeve can be installed on a drill rod for cavitation jet and can be used independently, so that the functions of self-anchoring, self-sealing hole and waste water recovery can be realized, secondary disasters caused by gas outburst can be effectively prevented, the waste water recovery, self-anchoring and self-sealing hole are convenient to operate, the structure is novel, the conception is ingenious, and the application prospect is good
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a self-anchoring and self-sealing hole for cavitation jet flow and a waste water recovery sleeve comprise an outer sleeve assembly, an inner sleeve assembly and a gland,
the inner sleeve component is screwed inside the outer sleeve component, the rear end part of the inner sleeve component extends out of the outer sleeve component, the gland is fixed at the rear end part of the outer sleeve component and is pressed at the rear end part of the inner sleeve component,
the combined surface of the inner sleeve component and the gland is provided with a water return groove, the gland is provided with a water return port communicated with the water return groove, and the water return port is connected with a wastewater recovery system.
The self-anchoring, self-sealing hole and waste water recovery sleeve for cavitation jet flow are arranged on the periphery of the gland, threaded connection holes are distributed at equal intervals, and fixing bolts penetrate through the threaded connection holes to fixedly connect the gland with the rear end part of the outer sleeve assembly.
The self-anchoring, self-sealing hole and waste water recovery sleeve for cavitation jet flow comprises an outer sleeve body, a pawl, a hole sealing rubber sleeve and a movable sleeve,
the pawls are in a plurality of groups and are hinged on the peripheral ring at the front part of the outer sleeve body at equal intervals, the inner sleeve component is rotationally screwed into the ratchet fixing surface for tensioning the pawls in the outer sleeve body, and at the moment, the ratchet fixing surface of the pawl extends out of the outer wall of the outer sleeve body to realize self-anchoring of the outer sleeve component;
the hole sealing rubber sleeve and the movable sleeve are sequentially sleeved on the middle part of the outer sleeve body from front to back, the inner sleeve component is rotationally screwed into the outer sleeve body to push the movable sleeve to extrude the hole sealing rubber sleeve, the self hole sealing of the outer wall of the outer sleeve component is realized,
the rear end part of the outer sleeve body is a flange fixing end surface used for fixing the gland.
The self-anchoring and self-sealing hole for cavitation jet flow and the wastewater recycling sleeve pipe, the inner sleeve pipe assembly comprises an inner sleeve pipe body and a pin locking mechanism, the rear end part of the inner sleeve pipe body is provided with a flange fixed end which is fixedly connected with a gland, the circumference of the flange fixed end is provided with a plurality of groups of handles which are convenient to rotate, the handles are used for screwing the inner sleeve pipe body into the outer sleeve pipe body in a rotating way,
the backwater groove is arranged on the fixed end of the flange and is communicated with the inner sleeve body,
the pin locking mechanism is a plurality of groups and is distributed on the outer wall of the inner sleeve body at equal intervals, pins are arranged in the pin locking mechanism,
the inner sleeve body is rotationally screwed into the outer sleeve body, and after the pin reaches the movable sleeve, the end part of the pin pops out of the outer wall of the inner sleeve body and is embedded into the movable sleeve to push the movable sleeve to extrude the hole sealing rubber sleeve.
The self-anchoring and self-sealing hole for cavitation jet flow and the wastewater recycling sleeve are characterized in that an annular groove is formed in the joint surface of the gland and the inner sleeve assembly, the annular groove is located at the inner side of the water return hole, and a rubber sealing ring is arranged in the annular groove.
The two groups of pawls are symmetrically hinged on the peripheral ring at the front part of the outer sleeve body.
The handles are three groups and are distributed at equal intervals on the circumference of the fixed end of the flange; the pin locking mechanism is two groups, and is symmetrically distributed on the outer wall of the inner sleeve body.
The self-anchoring and self-sealing hole for cavitation jet flow and the wastewater recycling sleeve are characterized in that the outer wall of the inner sleeve body is provided with internal threads, and the inner wall of the outer sleeve body is provided with external threads matched with the internal threads.
The beneficial effects of the invention are as follows: the self-anchoring and self-sealing hole for cavitation jet and the waste water recovery sleeve can be installed on a drill rod for cavitation jet and can be used independently, so that the self-anchoring, self-sealing hole and waste water recovery functions can be realized, secondary disasters caused by gas outburst can be effectively prevented, the waste water recovery, self-anchoring and self-sealing hole are convenient to operate, the structure is novel, the conception is ingenious, and the application prospect is good.
Drawings
FIG. 1 is a schematic illustration of the self-anchoring, self-sealing hole and wastewater recovery sleeve for cavitation jet of the present invention;
FIG. 2 is a rear view of the self-anchoring, self-sealing hole and wastewater recovery sleeve for cavitation jet of the present invention.
The meaning of the symbols in the drawings is as follows:
1: an outer sleeve assembly; 101: an outer sleeve body; 102: a pawl; 103: sealing the hole rubber sleeve; 104: a movable sleeve; 105: a flange fixing end surface; 2: an inner sleeve assembly; 201: a water return tank; 202: an inner sleeve body; 203: a pin locking mechanism; 204: a flange fixed end; 205: a handle; 206: a pin; 3: a gland; 301: a water return port; 302: a threaded connection hole; 303: an annular groove; 304: and a rubber sealing ring.
Detailed Description
The invention will be further described with reference to the drawings.
As shown in fig. 1 and 2, the self-anchoring and self-sealing hole for cavitation jet and the wastewater recovery sleeve of the invention comprise an outer sleeve assembly 1, an inner sleeve assembly 2 and a gland 3,
the inner sleeve component 2 is screwed inside the outer sleeve component 1, the rear end part of the inner sleeve component 2 extends out of the outer sleeve component 1, the gland 3 is fixed at the rear end part of the inner sleeve component 1 and pressed at the rear end part of the inner sleeve component 2,
the combined surface of the inner sleeve assembly 2 and the gland 3 is provided with a water return tank 201, the gland 3 is provided with a water return port 301 communicated with the water return tank 201, and the water return port 301 is connected with a wastewater recovery system.
The circumference of the gland 3 is provided with equally spaced threaded connection holes 302, and fixing bolts penetrate through the threaded connection holes 302 to fixedly connect the gland 3 with the rear end part of the outer sleeve assembly 1.
The outer sleeve assembly 1 comprises an outer sleeve body 101, a pawl 102, a hole sealing rubber sleeve 103 and a movable sleeve 104,
the pawls 102 are multiple groups and are hinged on the circumference of the front part of the outer sleeve body 101 at equal intervals, the inner sleeve component 2 is rotationally screwed into the outer sleeve body 101 to tighten the ratchet fixing surface of the pawls 102, at the moment, the ratchet fixing surface of the pawls 102 extends out of the outer wall of the outer sleeve body 101 to realize self-anchoring of the outer sleeve component 1, and the inner sleeve component 2 is continuously screwed to realize sealing of the inner sleeve component 2 and the outer sleeve body 101;
the hole sealing rubber sleeve 103 and the movable sleeve 104 are sequentially sleeved on the middle part of the outer sleeve body 101 from front to back, and the inner sleeve assembly 2 is rotationally screwed into the outer sleeve body 101 to push the movable sleeve 104 to extrude the hole sealing rubber sleeve 103, so that the outer wall of the outer sleeve assembly 1 is self-sealed;
the rear end of the outer sleeve body 101 is a flange fixing end face 105 for fixing with the gland 3.
The inner sleeve assembly 2 comprises an inner sleeve body 202 and a pin locking mechanism 203, the rear end part of the inner sleeve body 202 is provided with a flange fixed end 204, the flange fixed end 204 is fixedly connected with a gland 3, the circumference of the flange fixed end 204 is provided with a plurality of groups of handles 205 which are convenient to rotate, the handles 205 are used for screwing the inner sleeve body 202 into the outer sleeve body 101 in a rotating way,
the backwater groove 201 is arranged on the flange fixed end 204 and is communicated with the inner sleeve body 202,
the pin locking mechanism 203 is formed by a plurality of groups, which are distributed on the outer wall of the inner sleeve body 202 at equal intervals, the pin locking mechanism 203 is internally provided with pins 206,
the inner sleeve body 202 is rotationally screwed into the outer sleeve body 101, after the pin 206 reaches the movable sleeve 104, the end of the pin 206 pops out of the outer wall of the inner sleeve body 202 and is used for pushing the movable sleeve 104 to extrude the hole sealing rubber sleeve 103, so that the self-sealing hole of the outer sleeve assembly 1 is realized.
Preferably, an annular groove 303 is arranged on the joint surface of the gland 3 and the inner sleeve component 2, the annular groove 303 is positioned at the inner side of the water return port 301, and a rubber sealing ring 304 is arranged in the annular groove 303 and used for improving the tightness of the joint surface of the gland 3 and the inner sleeve component 2 and preventing leakage, and waste water only flows into the waste water recovery system from the water return tank 201 and the water return port 301 in sequence, so that the waste water recovery function is realized.
The two groups of pawls 102 are symmetrically hinged on the peripheral ring at the front part of the outer sleeve body 101, and the two groups of pawls 102 can sufficiently realize self-anchoring of the outer sleeve body 101 and can be added with a plurality of groups of pawls according to the requirement.
The handles 205 are three groups and are distributed at equal intervals on the circumference of the flange fixing end 204, so that the rotation is convenient, the operation is convenient, and a plurality of groups of handles can be added as required; the pin locking mechanisms 203 are two groups and are symmetrically distributed on the outer wall of the inner sleeve body 202, multiple groups of pin locking mechanisms can be added according to requirements, the pin 206 is embedded in the outer wall of the inner sleeve body 202 through a spring, the pin 206 can be ejected out of the outer wall of the inner sleeve body 202 under the control of the spring, the pin 206 is manually pressed down to be embedded in the outer wall of the inner sleeve body 202 at the beginning, after the pin 206 reaches the position of the movable sleeve 104, the end part of the pin 206 is ejected out of the outer wall of the inner sleeve body 202 under the control of the spring and is embedded in the movable sleeve 104, and the pin 206 is used for pushing the movable sleeve 104 to extrude the hole sealing rubber sleeve 103, so that the function of self hole sealing is realized.
According to the self-anchoring and self-sealing hole for cavitation jet and the wastewater recycling sleeve, the inner threads are arranged on the outer wall of the inner sleeve body 202, the outer threads matched with the inner threads are arranged on the inner wall of the outer sleeve body 101, and the inner sleeve body 202 is conveniently screwed into the outer sleeve body 101 smoothly under the rotation of the handle 205, so that the self-anchoring and self-sealing hole functions are realized.
The self-anchoring and self-sealing hole for cavitation jet and the waste water recovery sleeve can be installed on a cavitation jet drill rod for use and can be used independently, a large amount of high-pressure waste water can be generated when the cavitation jet drill rod drills, and meanwhile, the risk of centralized gas release can be generated in the process of cavitating a jet coal seam.
In conclusion, the self-anchoring and self-sealing hole for cavitation jet and the waste water recovery sleeve can be installed on a drill rod for cavitation jet and can be independently used, the functions of self-anchoring, self-sealing hole and waste water recovery can be realized, secondary disasters caused by gas outburst can be effectively prevented, the waste water recovery, self-anchoring and self-sealing hole are convenient to operate, the structure is novel, the conception is ingenious, and the application prospect is good.
The foregoing has outlined and described the basic principles, features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A self-anchoring, self-sealing hole and waste water recovery sleeve pipe for cavitation efflux, its characterized in that: comprises an outer sleeve component (1), an inner sleeve component (2) and a gland (3),
the inner sleeve component (2) is screwed inside the outer sleeve component (1), the rear end part of the inner sleeve component (2) extends out of the outer sleeve component (1), the gland (3) is fixed at the rear end part of the outer sleeve component (1) and is pressed at the rear end part of the inner sleeve component (2),
the utility model discloses a waste water recovery device, which is characterized in that a water return groove (201) is arranged on the joint surface of an inner sleeve component (2) and a gland (3), a water return opening (301) communicated with the water return groove (201) is arranged on the gland (3), the water return opening (301) is connected with a waste water recovery system, threaded connecting holes (302) which are distributed at equal intervals are arranged on the circumference of the gland (3), fixing bolts penetrate through the threaded connecting holes (302), the gland (3) is fixedly connected with the rear end part of an outer sleeve component (1), the outer sleeve component (1) comprises an outer sleeve body (101), a pawl (102), a hole sealing rubber sleeve (103) and a movable sleeve (104),
the pawl (102) is a plurality of groups and is hinged on the circumference of the front part of the outer sleeve body (101) at equal intervals, the inner sleeve assembly (2) is rotationally screwed into the ratchet fixing surface of the pawl (102) in the outer sleeve body (101) for tensioning, and at the moment, the ratchet fixing surface of the pawl (102) extends out of the outer wall of the outer sleeve body (101) to realize self-anchoring of the outer sleeve assembly (1);
the hole sealing rubber sleeve (103) and the movable sleeve (104) are sequentially sleeved on the middle part of the outer sleeve body (101) from front to back, the inner sleeve assembly (2) is rotationally screwed into the outer sleeve body (101) and used for pushing the movable sleeve (104) to extrude the hole sealing rubber sleeve (103) so as to realize the self hole sealing of the outer wall of the outer sleeve assembly (1),
the rear end part of the outer sleeve body (101) is provided with a flange fixing end face (105) used for being fixed with a gland (3), the inner sleeve assembly (2) comprises an inner sleeve body (202) and a pin locking mechanism (203), the rear end part of the inner sleeve body (202) is provided with a flange fixing end (204), the flange fixing end (204) is fixedly connected with the gland (3), the periphery of the flange fixing end (204) is provided with a plurality of groups of handles (205) which are convenient to rotate, the handles (205) are used for rotationally screwing the inner sleeve body (202) into the outer sleeve body (101),
the backwater groove (201) is arranged on the flange fixed end (204) and is communicated with the inner sleeve body (202),
the pin locking mechanism (203) is a plurality of groups and is distributed on the outer wall of the inner sleeve body (202) at equal intervals, pins (206) are arranged in the pin locking mechanism (203),
the novel sealing device is characterized in that the inner sleeve body (202) is rotationally screwed into the outer sleeve body (101), after the pin (206) reaches the movable sleeve (104), the end part of the pin (206) is ejected out of the outer wall of the inner sleeve body (202) and embedded into the movable sleeve (104) and used for pushing the movable sleeve (104) to extrude the hole sealing rubber sleeve (103), an annular groove (303) is formed in the joint surface of the gland (3) and the inner sleeve assembly (2), the annular groove (303) is located the inner side of the water return port (301), a rubber sealing ring (304) is arranged in the annular groove (303), and the pawls (102) are two groups and are symmetrically hinged to the periphery of the front part of the outer sleeve body (101).
2. The self-anchoring, self-sealing hole and wastewater recovery sleeve for cavitation jet according to claim 1, wherein: the handles (205) are three groups and are distributed at equal intervals on the circumference of the flange fixing end (204); the pin locking mechanisms (203) are two groups and are symmetrically distributed on the outer wall of the inner sleeve body (202).
3. The self-anchoring, self-sealing hole and wastewater recovery sleeve for cavitation jet according to claim 1, wherein: the outer wall of the inner sleeve body (202) is provided with an internal thread, and the inner wall of the outer sleeve body (101) is provided with an external thread matched with the internal thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910013568.XA CN109519131B (en) | 2019-01-07 | 2019-01-07 | Self-anchoring, self-sealing hole and waste water recovery sleeve for cavitation jet flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910013568.XA CN109519131B (en) | 2019-01-07 | 2019-01-07 | Self-anchoring, self-sealing hole and waste water recovery sleeve for cavitation jet flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109519131A CN109519131A (en) | 2019-03-26 |
| CN109519131B true CN109519131B (en) | 2023-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910013568.XA Active CN109519131B (en) | 2019-01-07 | 2019-01-07 | Self-anchoring, self-sealing hole and waste water recovery sleeve for cavitation jet flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109519131B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266415B (en) * | 2021-06-16 | 2024-06-11 | 陕西长武亭南煤业有限责任公司 | Gas extraction equipment and method with alternate extraction and compression |
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| CN206860124U (en) * | 2017-06-21 | 2018-01-09 | 周闽敏 | Drilling on waterways mud drainage device |
| CN207660586U (en) * | 2017-11-06 | 2018-07-27 | 辽宁工程技术大学 | From anchoring, the integrated apparatus of self-sealing, high pressure water injection pressure break |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU216666A (en) * | 1966-02-28 | 1967-08-31 | D. Cumming James | Grouted rock bolt |
| CN2391014Y (en) * | 1998-02-06 | 2000-08-09 | 中国科学院地质研究所 | Electric measuring multi-point extensometer |
| WO2005090753A1 (en) * | 2004-03-23 | 2005-09-29 | Alwag Tunnelausbau Gesellschaft M.B.H. | Method and device for producing pre-tensioned anchorings |
| CN102206990A (en) * | 2010-03-30 | 2011-10-05 | 哈利伯顿能源服务公司 | Well assembly with recesses facilitating branch wellbore creation |
| CN102704971A (en) * | 2012-01-11 | 2012-10-03 | 济南澳科矿山工程技术有限公司 | Grouting and Grouting-stopping anchor cable inside hole |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109519131A (en) | 2019-03-26 |
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