CN112253170A - Coal mining curtain grouting device and grouting method thereof - Google Patents
Coal mining curtain grouting device and grouting method thereof Download PDFInfo
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- CN112253170A CN112253170A CN202011006420.2A CN202011006420A CN112253170A CN 112253170 A CN112253170 A CN 112253170A CN 202011006420 A CN202011006420 A CN 202011006420A CN 112253170 A CN112253170 A CN 112253170A
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- grouting
- pipe
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- curtain
- grout
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
Abstract
The invention discloses a curtain grouting device for coal mining and a grouting method thereof. The grouting method disclosed by the invention is simple in structure and convenient to install, and can realize segmented grouting of the grouting hole from bottom to top.
Description
Technical Field
The invention relates to the field of curtain grouting, in particular to a coal mining curtain grouting device and a grouting method thereof.
Background
Curtain grouting is a grouting technology, which is to press and convey slurry capable of solidifying into a specified rock-soil layer through a special grouting drill hole according to a designed concentration by using hydraulic pressure or air pressure, so as to fill cracks or pores in the rock-soil body, and aims to improve the physical and mechanical properties of a grouting object to meet the requirements of various projects. The method is characterized in that grout is injected into a drill hole with reasonable hole distance, so that grouting bodies in all holes are mutually overlapped to form a concrete impervious wall similar to a curtain, and water flow is cut off, thereby achieving the purposes of seepage prevention and leakage stoppage, and the method is also called curtain grouting.
At present, the grouting method mainly comprises an orifice closing grouting method, a drill rod grouting method and a grouting pipe grouting method additionally arranged in a sleeve. Due to instability of the hole wall in the construction of the orifice-sealing grouting method, hole collapse is easy to occur in the drilling and grouting process, and one section of grouting can be completed only by repeating the hole collapse for many times, so that the construction progress is slow. The grouting device of the orifice sealing grouting method is an orifice sealer, and the orifice sealer has certain obstruction on movable drill rods in grouting and lifting and disassembling the drill rods after grouting. In the drilling rod grouting method, because the gap between the drilling rod and the hole wall is large, slurry easily overflows from an orifice, a certain pressure requirement cannot be met, and the grouting quality is difficult to ensure. The grouting device of the drill rod grouting method is a drill rod, the drill rod is difficult to seal, and certain limitation is brought to the grouting pressure meeting the requirement. The grouting method of additionally arranging a grouting pipe in the sleeve has the disadvantages of difficult thick slurry and sound slurry filling, unsatisfactory grouting effect, relatively complex process, complicated operation steps and low work efficiency because the grouting pipe in the sleeve is small. The grouting device of the grouting pipe grouting method additionally arranged in the sleeve is a sealer and a grouting pipe, and the device is mainly characterized in that the grouting pipe has a small pipe diameter and is difficult to fill thick slurry, paste slurry and other slurry.
Although the grouting method of additionally arranging the grouting pipe in the sleeve has certain limitation on grouting slurry, the method can ensure that the grouted stratum in the hole reaches certain grouting pressure and the compactness of the grouted stratum, meanwhile, the method does not have the phenomenon of repetition caused by hole collapse, and the construction process is simpler. Therefore, the method combines the advantages of the orifice sealing grouting method and the drill rod grouting method. The grouting device slurry of the grouting pipe grouting method is additionally arranged in the existing sleeve pipe, easily enters a gap between the grouting outer pipe and the grouting hole, so that the grouting pipe is difficult to lift, and meanwhile, the slurry is diffused simply through the pressure of a grouting pump, so that the curtain building effect is poor.
Disclosure of Invention
In order to solve the defects in the background technology, the invention aims to provide a coal mining curtain grouting device and a grouting method thereof.
The purpose of the invention can be realized by the following technical scheme:
a coal mining curtain grouting apparatus comprising:
the grouting device comprises a high-pressure grouting pipe, a grouting pipe and a grouting pipe, wherein the high-pressure grouting pipe is of a concentric pipe structure and comprises a grouting inner pipe and a grouting outer pipe which are concentrically nested, a grout return channel is formed between the grouting inner pipe and the grouting outer pipe, the grouting outer pipe is provided with a grout return port connected with the grout return channel, and the upper end of the grouting inner pipe is provided with a grouting port connected with the grouting pipe;
the grout pipe fixing device is used for fixing the high-pressure grout pipe in the grout hole and forming a closed gas channel between the grout hole and the outer grout pipe; the closed gas channel is connected with a gas inlet.
Preferably, the curtain grouting device for coal mining is characterized in that an annular rubber pad is arranged on the outer side wall of the lower end of the grouting outer pipe.
Preferably, foretell coal mining curtain slip casting device, the high pressure grout pipe is the sectional type structure, links to each other through the connector between two sections adjacent, the connector includes concentric connection outer tube and the connection inner tube that sets up, the connection outer tube with the connection inner tube respectively with the grout outer tube grout inner tube connection.
Preferably, in the coal mining curtain grouting device, the diameter of the inner wall of the connecting inner pipe is larger than that of the outer wall of the grouting inner pipe.
Preferably, the inner wall of the end part of the connecting inner pipe is provided with an annular step, the annular step is fixedly provided with a plurality of sealing rings, and the connecting inner pipe is spliced with the grouting inner pipe.
Preferably, in the coal mining curtain grouting device, the connecting outer pipe is in threaded connection with the grouting outer pipe.
Preferably, foretell coal mining curtain slip casting device still includes the mount pad, the mount pad top is equipped with the mounting hole, thick liquid pipe fixing device is a mounting flange, mounting flange passes through the bolt with the mount pad and can dismantle the connection.
A coal mining curtain grouting method comprises the following steps:
inserting the lower end of a high-pressure grouting pipe into the grouting hole;
introducing high-pressure gas between the high-pressure grouting pipe and the grouting hole;
grouting the grout in the hole by using the grouting inner pipe of the grouting pipe, and recovering grout by using the grouting outer pipe which is concentrically nested with the grouting inner pipe.
Preferably, the curtain grouting method for coal mining comprises the following steps: the high-pressure gas pressure is equal to the grouting inner pipe pressure of the high-pressure grouting pipe.
Preferably, the curtain grouting method for coal mining adopts a segmented grouting mode of grouting holes from bottom to top, the high-pressure grouting pipe is of a segmented structure, and after each segment of grouting is completed, the high-pressure grouting pipe is lifted by reducing the number of segments in the middle or the length of the middle segment.
The invention has the beneficial effects that:
1. the upper pipe, the middle pipe and the lower pipe of the coal mining curtain grouting device are assembled and connected through the connectors, the assembly and disassembly are rapid and convenient, the outer wall of the lower end of the grouting outer pipe a is connected with the fixing flange in a sealing and sliding mode, the air inlet is fixedly installed on one side of the top of the fixing flange and externally connected with the high-pressure air pump, high-pressure air is injected into the grouting hole through the air inlet, the flow blocking cushion is fixedly installed on the side wall of the grouting outer pipe c of the lower pipe, and slurry can be prevented from entering a gap between the high-pressure grouting pipe and the grouting hole.
2. According to the curtain grouting device and method for coal mining, disclosed by the invention, when the grouting hole at the bottom of the grouting pipe is filled with slurry, high-pressure air is continuously conveyed by matching with the high-pressure air pump, the air pressure in the grouting hole is maintained, the air pressure is the same as the hydraulic pressure of grouting slurry and is maintained for 3-5min, and the diffusion speed of the slurry to the surrounding soil gap can be increased. According to the invention, after the bottom section grouting is completed, one end of the grouting pipe is lifted for a distance, and the grouting operation in the step S4 is repeated, so that the grouting hole is grouted in a segmented manner from bottom to top, and the grouting hole can be effectively prevented from collapsing.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the upper tube of the present invention;
FIG. 3 is a schematic view of the structure of the tube of the present invention;
FIG. 4 is a schematic view of the construction of the downtube of the present invention;
FIG. 5 is a schematic view of the construction of the connector of the present invention;
fig. 6 is a schematic diagram of an implementation of the present invention.
In the figure:
1-high-pressure grouting pipe, 2-upper pipe, 3-middle pipe, 4-lower pipe, 5-connector, 501-connecting outer pipe, 502-connecting block, 503-connecting inner pipe, 504-annular step, 505-sealing ring, 6a, 6b, 6 c-grouting inner pipe, 7a, 7b, 7 c-grouting outer pipe, 8-pressure gauge I, 9-grouting opening, 10-grout-returning opening, 11-fixing flange, 12-air inlet, 13-pressure gauge II, 14-flow-resisting cushion, 15-sealing cushion and 16-mounting seat.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
As shown in fig. 1-5, a coal mining curtain grouting device comprises a high-pressure grouting pipe 1, wherein the high-pressure grouting pipe 1 comprises an upper pipe 2, a middle pipe 3 and a lower pipe 4. This split design, but with disassembly. The upper pipe 2, the middle pipe 3 and the lower pipe 4 are assembled and connected through a connector 5, the upper pipe 2, the middle pipe 3 and the lower pipe 4 are all of concentric pipe structures, the concentric pipe structures comprise grouting inner pipes 6a, 6b and 6c and grouting inner pipes 6a, 6b, 6c outside cover inlays installation grout outer tube 7a, 7b, 7c, grout outer tube 7a is stretched out to grout inner tube 6a upper end of upper tube 2, grout inner tube 6a top fixed mounting manometer 8, grout opening 9 is installed to grout inner tube 7a upper end lateral wall fixed mounting, grout outlet 10 is installed to grout outer tube 7a lateral wall fixed mounting, grout outer tube 7a lower extreme outer wall sealing sliding connection mounting flange 11, mounting flange 11 top one side fixed mounting air inlet 12, mounting flange 11 top opposite side fixed mounting manometer two 13, grout outer tube 7c is stretched out to the grout inner tube 6c lower extreme of lower tube 4, the grout outer tube 7c lateral wall fixed mounting choked flow pad 14 of lower tube 4.
The connector 5 comprises a connecting outer pipe 501, threads are arranged on the outer walls of two ends of the connecting outer pipe 501, the connecting outer pipe 501 is in threaded connection with grouting outer pipes 7a, 7b and 7c, connecting blocks 502 are fixedly installed on the inner walls of two ends of the connecting outer pipe 501, an inner pipe 503 is fixedly installed and connected on the connecting blocks 502, the connecting inner pipe 503 and the connecting outer pipe 501 are coaxially arranged, annular steps 504 are formed in the inner walls of two ends of the connecting inner pipe 503, a plurality of sealing rings 505 are fixedly installed on the annular steps 504, and the connecting inner pipe 503 is spliced with grouting inner pipes 6a, 6b and 6.
The grouting outer pipes 7a, 7b and 7c are provided with internal threads at the openings, and the diameter of the top of the annular step 504 is larger than that of the grouting inner pipes 6a, 6b and 6 c. The top diameter of the annular step 504 is larger than the diameter of the grouting inner pipes 6a, 6b and 6c, but the bottom diameter of the annular step 504 is smaller than the diameter of the grouting inner pipes 6a, 6b and 6c, so that the design is safer, more reliable and faster to connect the upper and lower pipelines, and prevents the slurry from leaking to block the outer pipe. The grouting opening 9 is externally connected with a high-pressure grouting pump, the grout return opening 10 is externally connected with a grout recovery device, and the air inlet 12 is externally connected with a high-pressure air pump. And a sealing gasket 15 is fixedly arranged at the bottom of the fixed flange 11. The grouting inner pipes 6a, 6b and 6c and the grouting outer pipes 7a, 7b and 7c are stainless steel pipes, and the choke pad 14 is an annular rubber pad.
Still include mount pad 16, mount pad 16 is annular stainless steel foundry goods or cement prefab, and 16 tops of mount pad are equipped with the mounting hole, and mounting flange 11 passes through the bolt with mount pad 16 and can dismantle the connection.
The embodiment also provides a coal mining curtain grouting device and a grouting method, and the grouting method specifically comprises the following steps:
s1, drilling grouting holes at intervals along the curtain building direction, and burying mounting seats 16 around the top of the grouting holes;
s2, selecting a corresponding number of middle pipes 3 according to the depth of grouting holes, and then sequentially connecting the upper pipe 2, the middle pipes 3 and the lower pipe 4 through a connector 5 to assemble a high-pressure grouting pipe 1;
s3, inserting the lower end of the high-pressure grouting pipe 1 into a grouting hole, fixing the fixing flange 11 and the mounting seat 16 through bolts, connecting the grouting opening 9 with a high-pressure grouting pump, connecting the grout return opening 10 with a grout recovery device, and connecting the air inlet 12 with a high-pressure air pump;
s4, pumping high-pressure air into the grouting hole through a high-pressure air pump, measuring the air pressure in the grouting hole through a second pressure gauge 13, maintaining a certain pressure, pumping cement slurry or water glass into the grouting pump for grouting operation, measuring the hydraulic pressure of the slurry in the high-pressure grouting pipe 1 through a first pressure gauge 8 after the slurry flows back at a slurry return port 10, increasing the power of the high-pressure air pump to enable the air pressure to be equal to the hydraulic pressure of the slurry in the high-pressure grouting pipe 1, stopping grouting and relieving pressure after maintaining the pressure for 3-5min, completing bottom section grouting, and lifting the high-pressure grouting pipe 1 for a certain distance;
and S5, repeating the grouting operation in the step S4, and realizing the subsection grouting from the bottom to the top of the grouting hole.
The aperture of the grouting hole is not less than 50mm, the diameter of the high-pressure grouting pipe 1 is smaller than the diameter of the grouting hole, and the diameter of the flow blocking pad 14 is larger than the aperture of the grouting hole. And S4, pumping high-pressure air to maintain the pressure in the grouting hole at 3-5MPa, lifting the high-pressure grouting pipe 1 by a distance equivalent to the length of the lower end of the inner grouting pipe 6c extending out of the outer grouting pipe 7c, and shortening the length of the high-pressure grouting pipe 1 by detaching the middle pipe 3 after lifting the high-pressure grouting pipe 1 each time.
Example 1
As shown in fig. 6, a coal mining curtain grouting device and a grouting method specifically include the following steps:
s1, drilling grouting holes 17 with the aperture of 100mm and the depth of 18m at intervals along the curtain building direction, then burying mounting seats 16 around the tops of the grouting holes 17, wherein the mounting seats 16 are metal casting parts, and a through hole is formed in the middle of each mounting seat 16 and is not smaller than the aperture of each grouting hole;
s2, selecting 7 sections of middle pipes 3 to be connected end to end through connectors 5, wherein each section of middle pipe 3 is 2m long, the lengths of an upper pipe 2 and a lower pipe 4 are both 2m, then connecting the upper pipe 2 to the top of the middle pipe 3, connecting the lower pipe 4 to the bottom of the middle pipe 3, assembling the high-pressure grouting pipe 1, wherein grouting inner pipes (6a, 6b and 6c) are stainless steel pipes with the aperture of 50mm and the wall thickness of 3mm, and grouting outer pipes (7a, 7b and 7c) are stainless steel pipes with the aperture of 80mm and the wall thickness of 3 mm;
s3, slowly placing the assembled high-pressure grouting pipe 1 into the grouting hole 17, wherein the distance between the bottom of the high-pressure grouting pipe 1 and the bottom of the grouting hole 17 is 1m, fixing the fixing flange 11 and the mounting seat 16 through bolts, connecting the grouting opening 9 with a high-pressure grouting pump, connecting a slurry recovery device of the slurry return opening 10, and connecting the air inlet 12 with a high-pressure air pump;
s4, pumping high-pressure air into the grouting hole through a high-pressure air pump, measuring the air pressure in the grouting hole through a second pressure gauge 13, maintaining the pressure at 3.2MPa, pumping cement slurry or water glass into the grouting pump for grouting operation, measuring the hydraulic pressure of the slurry in the high-pressure grouting pipe 1 to be 7.6MPa through a first pressure gauge 8 after the slurry flows back at a slurry return port 10, increasing the power of the high-pressure air pump to enable the air pressure to reach 7-8MPa, stopping grouting and relieving pressure after maintaining the pressure for 5min, completing bottom section grouting, and lifting the high-pressure grouting pipe 1 by 1 m.
And S5, repeating the grouting operation 17 times in the step S4 to realize the subsection grouting of the grouting hole from bottom to top, wherein one section of the middle pipe 3 is detached every 2 times of lifting.
Example 2
As shown in fig. 6, a coal mining curtain grouting device and a grouting method specifically include the following steps:
s1, drilling grouting holes 17 with the aperture of 80mm and the depth of 10m at intervals along the curtain building direction, then burying mounting seats 16 around the tops of the grouting holes 17, wherein the mounting seats 16 are cement prefabricated parts, and a through hole is formed in the middle of each mounting seat 16 and is not smaller than the aperture of each grouting hole;
s2, selecting 4 sections of middle pipes 3 to be connected end to end through connectors 5, wherein each section of middle pipe 3 is 2m long, the lengths of an upper pipe 2 and a lower pipe 4 are both 1m, then connecting the upper pipe 2 to the top of the middle pipe 3, connecting the lower pipe 4 to the bottom of the middle pipe 3, assembling the high-pressure grouting pipe 1, wherein grouting inner pipes (6a, 6b and 6c) are stainless steel pipes with the aperture of 40mm and the wall thickness of 2mm, and grouting outer pipes (7a, 7b and 7c) are stainless steel pipes with the aperture of 60mm and the wall thickness of 3 mm;
s3, slowly placing the assembled high-pressure grouting pipe 1 into the grouting hole 17, wherein the distance between the bottom of the high-pressure grouting pipe 1 and the bottom of the grouting hole 17 is 1m, fixing the fixing flange 11 and the mounting seat 16 through bolts, connecting the grouting opening 9 with a high-pressure grouting pump, connecting a slurry recovery device of the slurry return opening 10, and connecting the air inlet 12 with a high-pressure air pump;
s4, pumping high-pressure air into the grouting hole through a high-pressure air pump, measuring the air pressure in the grouting hole through a second pressure gauge 13, maintaining the pressure at 4.4MPa, pumping cement slurry or water glass into the grouting pump for grouting operation, measuring the hydraulic pressure of the slurry in the high-pressure grouting pipe 1 to be 8.2MPa through a first pressure gauge 8 after the slurry flows back at a slurry return port 10, increasing the power of the high-pressure air pump to enable the air pressure to reach 7-8MPa, stopping grouting and relieving pressure after maintaining the pressure for 5min, completing bottom section grouting, and lifting the high-pressure grouting pipe 1 by 1 m.
And S5, repeating the grouting operation of the step S4 for 9 times to realize the subsection grouting of the grouting hole from bottom to top, wherein one section of the middle pipe 3 is detached every 2 times of lifting.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (10)
1. A coal mining curtain grouting device, characterized by comprising:
the high-pressure grouting pipe (1) is of a concentric pipe structure and comprises a grouting inner pipe and a grouting outer pipe which are concentrically nested, a grout return channel is formed between the grouting inner pipe and the grouting outer pipe, the grouting outer pipe is provided with a grout return port (10) connected with the grout return channel, and the upper end of the grouting inner pipe is provided with a grouting port (9) connected with the grouting pipe;
the grout pipe fixing device is used for fixing the high-pressure grout pipe (1) in the grout hole and forming a closed gas channel between the grout hole and the outer grout pipe; the closed gas channel is connected with a gas inlet (12).
2. The coal mining curtain grouting device according to claim 1, wherein an annular rubber pad is arranged on the outer side wall of the lower end of the grouting outer pipe.
3. The coal mining curtain grouting device according to claim 1, characterized in that the high-pressure grouting pipe (1) is of a sectional structure, two adjacent sections are connected through a connector (5), the connector (5) comprises a connecting outer pipe (501) and a connecting inner pipe (503) which are concentrically arranged, and the connecting outer pipe (501) and the connecting inner pipe (503) are respectively connected with the grouting outer pipe and the grouting inner pipe.
4. A coal mining curtain grouting device according to claim 3, characterized in that the diameter of the inner wall of the connecting inner pipe (503) is larger than the diameter of the outer wall of the grouting inner pipe.
5. The coal mining curtain grouting device according to claim 3, characterized in that an annular step (504) is formed in the inner wall of the end of the connecting inner pipe (503), a plurality of sealing rings (505) are fixedly mounted on the annular step (504), and the connecting inner pipe (503) is inserted into the grouting inner pipe.
6. A coal mining curtain grouting device according to claim 4, characterized in that the connecting outer pipe (501) is screwed with the grouting outer pipe.
7. The curtain grouting device for coal mining according to claim 1, characterized in that the curtain grouting device further comprises a mounting seat (16), a mounting hole is formed in the top of the mounting seat (16), the grout pipe fixing device is a fixing flange (11), and the fixing flange (11) is detachably connected with the mounting seat (16) through bolts.
8. A coal mining curtain grouting method is characterized by comprising the following steps:
inserting the lower end of the high-pressure grouting pipe (1) into the grouting hole;
introducing high-pressure gas between the high-pressure grouting pipe (1) and the grouting hole;
grouting is carried out in the hole by utilizing the grouting inner pipe of the grouting pipe (1), and grout is recovered by utilizing the grouting outer pipe which is concentrically nested with the grouting inner pipe.
9. The method of curtain grouting for coal mining of claim 8, comprising: the high-pressure gas pressure is equal to the grouting inner pipe pressure of the high-pressure grouting pipe.
10. The curtain grouting method for coal mining according to claim 8, characterized in that grouting holes are used for grouting from bottom to top in a segmented mode, the high-pressure grouting pipe (1) is of a segmented structure, and after each segment of grouting is completed, the high-pressure grouting pipe (1) is lifted by reducing the number of middle segments or the length of a middle segment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011006420.2A CN112253170A (en) | 2020-09-23 | 2020-09-23 | Coal mining curtain grouting device and grouting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011006420.2A CN112253170A (en) | 2020-09-23 | 2020-09-23 | Coal mining curtain grouting device and grouting method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201560428U (en) * | 2009-11-23 | 2010-08-25 | 曹志强 | Hole-sealing grouting plug |
| CN105041344A (en) * | 2015-06-30 | 2015-11-11 | 中国矿业大学 | High-pressure gas seam-expanding, grouting and water-plugging method for precutting trough of microfissure surrounding rock |
| CN110284849A (en) * | 2019-07-30 | 2019-09-27 | 重庆市能源投资集团科技有限责任公司 | A kind of hole sealing device and method for sealing with pressure for the nearly horizontal fractures drilling of coal mine |
| CN210946858U (en) * | 2019-10-30 | 2020-07-07 | 中国三峡建设管理有限公司 | Concentric tube type high-pressure grouting device |
-
2020
- 2020-09-23 CN CN202011006420.2A patent/CN112253170A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201560428U (en) * | 2009-11-23 | 2010-08-25 | 曹志强 | Hole-sealing grouting plug |
| CN105041344A (en) * | 2015-06-30 | 2015-11-11 | 中国矿业大学 | High-pressure gas seam-expanding, grouting and water-plugging method for precutting trough of microfissure surrounding rock |
| CN110284849A (en) * | 2019-07-30 | 2019-09-27 | 重庆市能源投资集团科技有限责任公司 | A kind of hole sealing device and method for sealing with pressure for the nearly horizontal fractures drilling of coal mine |
| CN210946858U (en) * | 2019-10-30 | 2020-07-07 | 中国三峡建设管理有限公司 | Concentric tube type high-pressure grouting device |
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Application publication date: 20210122 |