CN112922561A - Gas extraction drilling hole sealing method for underground bottom suction roadway of coal mine - Google Patents
Gas extraction drilling hole sealing method for underground bottom suction roadway of coal mine Download PDFInfo
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- CN112922561A CN112922561A CN202110233850.6A CN202110233850A CN112922561A CN 112922561 A CN112922561 A CN 112922561A CN 202110233850 A CN202110233850 A CN 202110233850A CN 112922561 A CN112922561 A CN 112922561A
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- 238000000605 extraction Methods 0.000 title claims abstract description 69
- 238000007789 sealing Methods 0.000 title claims abstract description 63
- 238000005553 drilling Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003245 coal Substances 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 93
- 238000005086 pumping Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 66
- 239000007924 injection Substances 0.000 claims description 66
- 239000002775 capsule Substances 0.000 claims description 20
- 238000007569 slipcasting Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 3
- 238000002788 crimping Methods 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 4
- 239000000084 colloidal system Substances 0.000 description 14
- 230000000149 penetrating effect Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Pipe Accessories (AREA)
Abstract
The method for drilling and sealing the gas extraction holes in the underground coal mine bottom suction roadway comprises the following steps: constructing a layer-through drilling hole in the coal seam upwards by using a drilling machine along different angles in the bottom suction roadway; after drilling holes, inserting a hole sealing device into the drilled holes; injecting liquid or gas into the hole sealing device to fix the drilling device in the drill hole and temporarily seal the hole in the drill hole; repeating the steps (1), (2) and (3) for a plurality of times on the cross section vertical to the bottom pumping roadway, wherein all the drill holes are positioned on one sector; and (4) performing grouting hole sealing operation sequentially through the hole sealing device in each drilled hole. The hole sealing method avoids the complicated processes of drilling one hole, grouting one hole and cleaning the grouting pump at one time in the conventional hole sealing, adopts the steps of injecting liquid for temporary hole sealing, then intensively stirring and intensively grouting, and intensively cleaning the grouting pump after grouting is finished, thereby saving time and reducing the labor intensity of workers.
Description
Technical Field
The invention belongs to the technical field of coal mine gas extraction, and particularly relates to a drilling and hole sealing method for gas extraction of a coal mine lower bottom suction roadway.
Background
After the construction of the gas extraction drill hole of the underground bottom suction roadway, the smooth gas extraction must be carried out immediately by inserting the pipe and sealing the hole, if the holes are unified after the sector of the whole construction drill site is completely formed, the hole of the drill hole formed first is easy to collapse, so that the hole sealing device cannot be inserted smoothly, and the drill hole is easy to scrap. However, the hole packer used for the coal mine underground pumping roadway is generally large in length, if the hole packer is inserted immediately after a single drilling hole is formed, the hole packer is inserted into an uplink hole when the bottom pumping roadway is upwards inserted into the uplink hole, due to the large dead weight of the hole packer, the hole packer can easily slide off automatically without taking measures, if the hole packer is inserted into the hole packer for grouting immediately after the single drilling hole is formed, a grouting pump needs to be cleaned immediately after each hole is grouted, the workload of workers is increased, the efficiency is low, and the efficiency and the effect of gas pumping and normal excavation replacement are affected.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the hole sealing method for the gas extraction drill hole of the underground bottom suction roadway of the coal mine, which has the advantages of firm fixation of the hole sealing device, high construction efficiency, low cost and low labor intensity.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for sealing a gas extraction drill hole of a coal mine underground bottom suction roadway comprises the following steps,
(1) constructing a layer-through drilling hole in the coal seam upwards by using a drilling machine along different angles in the bottom suction roadway;
(2) after drilling holes, inserting a hole sealing device into the drilled holes;
(3) injecting liquid or gas into the hole sealing device to fix the drilling device in the drill hole and temporarily seal the hole in the drill hole;
(4) repeating the steps (1), (2) and (3) for a plurality of times on the cross section vertical to the bottom pumping roadway, wherein all the drill holes are positioned on one sector;
(5) and (4) performing grouting hole sealing operation sequentially through the hole sealing device in each drilled hole.
The hole sealing device comprises an extraction pipe, a liquid injection pipe, a grouting pipe, an upper rubber body tire bag and a lower rubber body tire bag, wherein the upper rubber body tire bag and the lower rubber body tire bag are arranged at an upper and lower interval, the upper rubber body tire bag is coaxially arranged at the lower part of the extraction pipe, the lower rubber body tire bag is coaxially arranged at the upper part of the extraction pipe, the liquid injection pipe and the grouting pipe are all arranged in parallel, the liquid injection pipe penetrates through the lower rubber body tire bag and the upper rubber body tire bag, an upper port of the liquid injection pipe is provided with a plug, liquid outlet holes are formed in the upper rubber body tire bag and the lower rubber body tire bag on the liquid injection pipe, a through hole is formed between the upper rubber body tire bag and the lower rubber body tire bag on the extraction pipe, the grouting pipe is arranged in the extraction pipe and is in contact with the inner wall of the extraction pipe, and the.
The external screw thread in slip casting pipe upper end has the set nut with slip casting pipe excircle crimping, and the slip casting pipe lower port is equipped with the slip casting quick connector, is equipped with the slip casting stop valve that is located drainage pipe lower port below on the slip casting pipe.
The lower port of the liquid injection pipe is provided with a liquid injection quick-plugging connector, and the liquid injection pipe is provided with a liquid injection stop valve positioned below the lower port of the extraction pipe.
The structure of going up capsule and lower capsule is the same, goes up the whole cylindric that is of capsule and lower capsule appearance, goes up the center of capsule and lower capsule and offers the poling hole that is used for passing and takes out the drainage pipe, goes up the inside of capsule and lower capsule and is annular cavity, goes up the upper end face of capsule and lower capsule and all is equipped with the poling jiao zui that lies in a straight line down the terminal surface, annotates liquid pipe excircle and poling jiao zui internal seal cooperation.
The lower end of the upper section of the extraction pipe is in butt joint with the upper end of the lower section of the extraction pipe and is connected into a whole through a pipe hoop, and the outer circle of the extraction pipe is in threaded connection with the inner circle of the pipe hoop.
The specific process of the step (3) is as follows: connecting a quick liquid injection connector with a liquid injection pipe of a liquid injection pump, starting the liquid injection pump, injecting clear water pumped by the liquid injection pump into annular cavities inside an upper rubber body bladder and a lower rubber body bladder through the liquid injection pipe, expanding the upper rubber body bladder and the lower rubber body bladder, pressing the outer circles of the upper rubber body bladder and the lower rubber body bladder against the hole walls of drilled holes until the display value of a pressure gauge on the liquid injection pump reaches a preset value P0, closing a liquid injection stop valve on the liquid injection pipe, and stopping liquid injection of the liquid injection pump; at the moment, the hole sealing device is suspended in the drill hole under the action of the friction force F0 between the upper rubber tire bag, the lower rubber tire bag and the hole wall of the drill hole and cannot fall off, and the hole wall of the drill hole forms a grouting closed space between the upper rubber tire bag and the lower rubber tire bag.
The specific process of the step (5) is as follows: stirring hole sealing slurry, connecting a grouting quick connector with a grouting pump, starting the grouting pump, injecting the slurry into a grouting closed space between an upper rubber body tire bag and a lower rubber body tire bag through a grouting pipe by the grouting pump until the slurry is filled in the space between the upper rubber body tire bag and the lower rubber body tire bag and reaches a preset pressure, finally determining to stop grouting according to a display value of a pressure gauge on the grouting pump, closing a grouting stop valve on the grouting pipe, and completing grouting operation.
By adopting the technical scheme, each part of the invention has the following technical effects:
the upper rubber tyre bag and the lower rubber tyre bag are a sealed rubber storage space, the shapes of the upper rubber tyre bag and the lower rubber tyre bag are similar to an axially stretched tyre, the upper end surface and the lower end surface of the rubber tyre bag are respectively provided with a pipe penetrating rubber nozzle, a liquid outlet pipe conveniently penetrates through the pipe penetrating rubber nozzles and has a strong sealing effect, the upper end port of the liquid injection pipe is provided with a plug for sealing, the upper rubber tyre bag and the lower rubber tyre bag are connected into a whole by a drainage pipe, a certain grouting sealed space is reserved between the upper rubber tyre bag and the lower rubber tyre bag, and liquid (water) can be directly injected into the upper rubber tyre bag and the lower rubber tyre bag because the rubber tyre bag is not permeable. The outer circles of the upper rubber body tire bag and the lower rubber body tire bag are provided with rough structures, the annular rough structures are embedded into the wall of a drill hole through the squeezing action between liquid pressure and the wall of the drill hole, the friction force between the rubber body tire bag and the wall of the drill hole is increased, the inner diameter of a through hole in the center of the rubber body tire bag is slightly smaller than the outer diameter of the pumping pipe, and the rubber body tire bag is tightly attached to the pumping pipe through the elastic force of the rubber body tire bag to play a role in sealing and fixing.
Annotate the liquid pipe and be the tubule that has certain hardness and certain bearing capacity, the pipe diameter is decided according to the particular case, colloid child bag and lower colloid child bag are connected in its effect, and pour into liquid in the colloid child bag and the lower colloid child bag upwards through the liquid outlet that its upper portion set up, and it has certain pressure to keep going up in colloid child bag and the lower colloid child bag, annotate liquid pipe lower port and set up and annotate liquid quick-witted quick-connect plug, the position that is close to the drill hole mouth sets up annotates the liquid stop valve, annotate liquid quick-connect plug convenient and fast and connect the liquid pump, it annotates the liquid stop valve to close on the liquid pipe to annotate when last colloid child bag and lower colloid child bag inside formation predetermined pressure.
The grouting pipe is a thin pipe with certain hardness and certain bearing capacity, the pipe diameter of the grouting pipe is determined according to the grouting flow and grouting pressure required, the upper end of the grouting pipe penetrates through a through hole formed in the extraction pipe after being bent, the grouting pipe is fixed through a positioning nut, a grouting quick connector is connected with a grouting pump during hole sealing, the grouting pump is started to inject grout into a grouting closed space in a drill hole, grouting is stopped when a pressure gauge of the grouting pump reaches a preset value, a grouting stop valve on the grouting pipe is closed, and hole sealing is completed.
The extraction pipe is provided with two sections, one of the extraction pipes is provided with a through hole in advance, the outer circle of each section of the extraction pipe is provided with a colloid tyre bag, and the position of the colloid tyre bag on the extraction pipe is adjusted to adjust that a sufficient grouting closed space is left between the two colloid tyre bags. The whole extraction pipe is long and inconvenient to transport, and two sections of extraction pipes are conveniently connected into a whole on site through pipe hoops.
The hole sealing device disclosed by the invention is compact in structure and is arranged behind the extraction pipe when in use. After the drilling construction is finished, the extraction pipe and the hole sealing device are inserted into the drill hole together, the liquid injection pipe injects a temporary hole sealing medium into the colloid tyre bag, and the upper colloid tyre bag and the lower colloid tyre bag expand to support the drill hole and are embedded into the wall of the drill hole under the extrusion of the pressure medium and the wall of the drill hole, so that the extraction pipe is not easy to slide downwards.
In conclusion, the hole sealing method avoids the complicated processes of drilling one hole, grouting one hole and cleaning the grouting pump at one time in the conventional hole sealing, adopts the steps of injecting liquid for temporary hole sealing, then intensively stirring and intensively grouting, and intensively cleaning the grouting pump after grouting is finished, thereby saving the time and reducing the labor intensity of workers. The liquid medium used for temporary hole sealing can be water commonly used underground or other liquid media, and the source is wide.
Drawings
FIG. 1 is a vertical layout of a borehole in the present invention;
FIG. 2 is a schematic view of the sealing device according to the present invention;
FIG. 3 is a schematic axial sectional view of the hole sealing device according to the present invention.
The reference numerals are respectively:
1-grouting quick connector, 2-punching rubber nozzle, 3-upper rubber body bag, 4-pipe hoop, 5-extraction pipe external thread, 6-grouting pipe, 7-liquid injection quick connector, 8-extraction pipe, 9-pipe hole, 10-liquid injection pipe, 11-liquid injection stop valve, 12-grouting stop valve, 13-liquid outlet hole, 14-positioning nut, 15-plug, 16-rock stratum, 17-coal bed, 18-bottom extraction roadway and 19-lower rubber body bag.
Detailed Description
As shown in FIGS. 1-3, the method for sealing the gas extraction drill hole in the extraction roadway at the bottom of the coal mine comprises the following steps:
(1) constructing a layer-through drilling hole A in the coal seam upwards by a drilling machine along different angles in the bottom pumping roadway 18;
(2) after the drill hole A is formed, inserting a hole sealing device into the drill hole A;
(3) injecting liquid or gas into the hole sealing device to fix the drilling device in the drill hole A and temporarily sealing the hole of the drill hole A;
(4) repeating steps (1), (2) and (3) several times on a cross section perpendicular to the draw roadway 18, all the boreholes A, B, C, D, E, F, G lying on one sector;
(5) and (4) performing grouting hole sealing operation sequentially through the hole sealing device in each drilled hole.
The hole sealing device comprises an extraction pipe 8, a liquid injection pipe 10, a grouting pipe 6, an upper rubber body tyre bag 3 and a lower rubber body tyre bag 19, the upper rubber body tyre bag 3 and the lower rubber body tyre bag 19 are arranged at intervals up and down, the upper rubber body tyre bag 3 is coaxially arranged at the lower part of the extraction pipe 8, the lower rubber body tyre bag 19 is coaxially arranged at the upper part of the extraction pipe 8, the liquid injection pipe 10 and the grouting pipe 6 are all arranged in parallel, the liquid injection pipe 10 penetrates through the lower rubber body tyre bag 19 and the upper rubber body tyre bag 3, a plug 15 is arranged at the upper end opening of the liquid injection pipe 10, liquid outlet holes 13 are formed in the upper rubber body tyre bag 3 and the lower rubber body tyre bag 19 on the liquid injection pipe 10, a through hole is formed in the extraction pipe 8 between the upper rubber body tyre bag 3 and the lower rubber body tyre bag 19, the grouting pipe 6 is arranged in the extraction pipe 8 and is in contact with the inner wall of the extraction pipe 8, and the upper end of the.
The external thread of the upper end of the grouting pipe 6 is connected with a positioning nut 14 which is in compression joint with the excircle of the grouting pipe 6, the lower port of the grouting pipe 6 is provided with a grouting quick-connection-peg 1, and the grouting pipe 6 is provided with a grouting stop valve 12 which is positioned below the lower port of the extraction pipe 8.
The lower port of the liquid injection pipe 10 is provided with a liquid injection quick-connection-peg 7, and the liquid injection pipe 10 is provided with a liquid injection stop valve 11 positioned below the lower port of the extraction pipe 8.
The structure of the upper rubber body tire bag 3 is the same as that of the lower rubber body tire bag 19, the overall shapes of the upper rubber body tire bag 3 and the lower rubber body tire bag 19 are cylindrical, the center of the upper rubber body tire bag 3 and the center of the lower rubber body tire bag 19 are provided with a pipe penetrating hole 9 used for penetrating an extraction pipe 8, the inner parts of the upper rubber body tire bag 3 and the lower rubber body tire bag 19 are annular cavities, the upper end face and the lower end face of the upper rubber body tire bag 3 and the lower rubber body tire bag 19 are both provided with pipe penetrating rubber nozzles 2 located on a straight line, and the outer circle of the liquid injection pipe 10 is in sealing fit with the inner circle of the pipe penetrating rubber nozzle 2.
The extraction pipe 8 is provided with an upper section and a lower section, the lower end of the extraction pipe 8 of the upper section is butted with the upper end of the extraction pipe 8 of the lower section and is connected into a whole through the pipe hoop 4, and the outer circle of the extraction pipe 8 is in threaded connection with the inner circle of the pipe hoop 4.
The specific process of the step (3) is as follows: connecting a quick liquid injection plug 7 with a liquid injection pipe 10 of a liquid injection pump, starting the liquid injection pump, injecting clear water pumped by the liquid injection pump into annular cavities inside an upper rubber body tyre bag 3 and a lower rubber body tyre bag 19 through the liquid injection pipe 10, expanding the upper rubber body tyre bag 3 and the lower rubber body tyre bag 19, pressing the outer circles of the upper rubber body tyre bag 3 and the lower rubber body tyre bag 19 against the hole walls of drilled holes until the display value of a pressure gauge on the liquid injection pump reaches a preset value P0, closing a liquid injection stop valve 11 on the liquid injection pipe 10, and stopping liquid injection of the liquid injection pump; at the moment, the hole sealing device is suspended in the drill hole under the action of the friction force F0 between the upper rubber tire bag 3, the lower rubber tire bag 19 and the hole wall of the drill hole, the hole sealing device cannot fall off, and the hole wall of the drill hole forms a grouting closed space between the upper rubber tire bag 3 and the lower rubber tire bag 19.
The specific process of the step (5) is as follows: stirring hole sealing slurry, connecting the grouting quick connector 1 with a grouting pump, starting the grouting pump, injecting the slurry into a grouting closed space between the upper rubber body tyre bag 3 and the lower rubber body tyre bag 19 through the grouting pipe 6 by the grouting pump until the slurry is filled in the space between the upper rubber body tyre bag 3 and the lower rubber body tyre bag 19 and reaches a preset pressure, finally determining to stop grouting according to a display value of a pressure gauge on the grouting pump, and closing the grouting stop valve 12 on the grouting pipe 6 to finish grouting operation.
The foregoing embodiments illustrate the principles and features of the present invention, but the foregoing is merely illustrative of preferred embodiments of the present invention and is not to be construed as limiting thereof. In the light of this patent, those skilled in the art can make various changes and modifications without departing from the spirit of the invention and the scope of the appended claims. Therefore, the patent and protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. The method for drilling and sealing the gas extraction holes in the underground coal mine bottom suction roadway is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) constructing a layer-through drilling hole in the coal seam upwards by using a drilling machine along different angles in the bottom suction roadway;
(2) after drilling holes, inserting a hole sealing device into the drilled holes;
(3) injecting liquid or gas into the hole sealing device to fix the drilling device in the drill hole and temporarily seal the hole in the drill hole;
(4) repeating the steps (1), (2) and (3) for a plurality of times on the cross section vertical to the bottom pumping roadway, wherein all the drill holes are positioned on one sector;
(5) and (4) performing grouting hole sealing operation sequentially through the hole sealing device in each drilled hole.
2. The method for gas extraction, drilling and sealing of the coal mine underground roadway extraction according to claim 1, characterized by comprising the following steps: the hole sealing device comprises an extraction pipe, a liquid injection pipe, a grouting pipe, an upper rubber body tire bag and a lower rubber body tire bag, wherein the upper rubber body tire bag and the lower rubber body tire bag are arranged at an upper and lower interval, the upper rubber body tire bag is coaxially arranged at the lower part of the extraction pipe, the lower rubber body tire bag is coaxially arranged at the upper part of the extraction pipe, the liquid injection pipe and the grouting pipe are all arranged in parallel, the liquid injection pipe penetrates through the lower rubber body tire bag and the upper rubber body tire bag, an upper port of the liquid injection pipe is provided with a plug, liquid outlet holes are formed in the upper rubber body tire bag and the lower rubber body tire bag on the liquid injection pipe, a through hole is formed between the upper rubber body tire bag and the lower rubber body tire bag on the extraction pipe, the grouting pipe is arranged in the extraction pipe and is in contact with the inner wall of the extraction pipe, and the.
3. The method for gas extraction, drilling and hole sealing of the coal mine underground roadway extraction according to claim 2, characterized by comprising the following steps: the external screw thread in slip casting pipe upper end has the set nut with slip casting pipe excircle crimping, and the slip casting pipe lower port is equipped with the slip casting quick connector, is equipped with the slip casting stop valve that is located drainage pipe lower port below on the slip casting pipe.
4. The method for drilling and sealing the gas extraction holes in the coal mine underground bottom suction roadway according to claim 2 or 3, characterized by comprising the following steps: the lower port of the liquid injection pipe is provided with a liquid injection quick-plugging connector, and the liquid injection pipe is provided with a liquid injection stop valve positioned below the lower port of the extraction pipe.
5. The method for drilling and sealing the gas extraction holes in the coal mine underground bottom suction roadway according to claim 2 or 3, characterized by comprising the following steps: the structure of going up capsule and lower capsule is the same, goes up the whole cylindric that is of capsule and lower capsule appearance, goes up the center of capsule and lower capsule and offers the poling hole that is used for passing and takes out the drainage pipe, goes up the inside of capsule and lower capsule and is annular cavity, goes up the upper end face of capsule and lower capsule and all is equipped with the poling jiao zui that lies in a straight line down the terminal surface, annotates liquid pipe excircle and poling jiao zui internal seal cooperation.
6. The method for sealing the coal mine underground bottom suction roadway gas extraction drill hole according to claim 1, 2 or 3, characterized by comprising the following steps: the lower end of the upper section of the extraction pipe is in butt joint with the upper end of the lower section of the extraction pipe and is connected into a whole through a pipe hoop, and the outer circle of the extraction pipe is in threaded connection with the inner circle of the pipe hoop.
7. The method for gas extraction, drilling and sealing of the coal mine underground roadway extraction according to claim 6, characterized by comprising the following steps: the specific process of the step (3) is as follows: connecting a quick liquid injection connector with a liquid injection pipe of a liquid injection pump, starting the liquid injection pump, injecting clear water pumped by the liquid injection pump into annular cavities inside an upper rubber body bladder and a lower rubber body bladder through the liquid injection pipe, expanding the upper rubber body bladder and the lower rubber body bladder, pressing the outer circles of the upper rubber body bladder and the lower rubber body bladder against the hole walls of drilled holes until the display value of a pressure gauge on the liquid injection pump reaches a preset value P0, closing a liquid injection stop valve on the liquid injection pipe, and stopping liquid injection of the liquid injection pump; at the moment, the hole sealing device is suspended in the drill hole under the action of the friction force F0 between the upper rubber tire bag, the lower rubber tire bag and the hole wall of the drill hole and cannot fall off, and the hole wall of the drill hole forms a grouting closed space between the upper rubber tire bag and the lower rubber tire bag.
8. The method for gas extraction, drilling and sealing of the coal mine underground roadway extraction according to claim 7, characterized by comprising the following steps: the specific process of the step (5) is as follows: stirring hole sealing slurry, connecting a grouting quick connector with a grouting pump, starting the grouting pump, injecting the slurry into a grouting closed space between an upper rubber body tire bag and a lower rubber body tire bag through a grouting pipe by the grouting pump until the slurry is filled in the space between the upper rubber body tire bag and the lower rubber body tire bag and reaches a preset pressure, finally determining to stop grouting according to a display value of a pressure gauge on the grouting pump, closing a grouting stop valve on the grouting pipe, and completing grouting operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110233850.6A CN112922561A (en) | 2021-03-03 | 2021-03-03 | Gas extraction drilling hole sealing method for underground bottom suction roadway of coal mine |
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| CN202110233850.6A CN112922561A (en) | 2021-03-03 | 2021-03-03 | Gas extraction drilling hole sealing method for underground bottom suction roadway of coal mine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202446A (en) * | 2021-06-25 | 2021-08-03 | 河南理工大学 | Reusable hole packer for coal mine underground gas extraction cross-layer drilling and operation method thereof |
| CN114033333A (en) * | 2021-11-01 | 2022-02-11 | 河南理工大学 | Anti-slipping hole sealing method for underground bottom suction roadway gas extraction drill hole |
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| US20180209259A1 (en) * | 2015-01-06 | 2018-07-26 | China University Of Mining And Technology | Method for gas extraction alternating oscillating pulse high energy gas extraction with thermal injection |
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