CN114542151A - Coal face gas extraction and roof treatment method - Google Patents
Coal face gas extraction and roof treatment method Download PDFInfo
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- CN114542151A CN114542151A CN202210030044.3A CN202210030044A CN114542151A CN 114542151 A CN114542151 A CN 114542151A CN 202210030044 A CN202210030044 A CN 202210030044A CN 114542151 A CN114542151 A CN 114542151A
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- 239000003245 coal Substances 0.000 title claims abstract description 94
- 238000000605 extraction Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 82
- 238000005422 blasting Methods 0.000 claims abstract description 18
- 238000005065 mining Methods 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 14
- 239000002360 explosive Substances 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 3
- 239000003034 coal gas Substances 0.000 abstract 1
- 239000011435 rock Substances 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 206010024796 Logorrhoea Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/0004—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face
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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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
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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
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/007—Drilling by use of explosives
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
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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)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Examining Or Testing Airtightness (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a coal face gas extraction and roof treatment method, and aims to realize advanced early warning on mine pressure display and roof drilling, blasting and pressure relief and coal gas extraction. Therefore, a plurality of first drilling machines are arranged in front of the working face hydraulic support group; drilling a pilot hole on a coal seam working surface by using a first drill rod of a first drilling machine, expanding a bag of the first drill rod, attaching the bag to the wall surface of the pilot hole, and sealing the pilot hole; and then, normally cutting coal of the coal mining machine, starting a gas extraction system when a measuring element measures that the pressure in the bag is increased, extracting gas from the working face of the coal seam by using a first drill rod, and performing drilling blasting on the coal seam roof of the mining suspended roof in the roadway of the working face when the measuring element measures that the pressure in the bag is increased to a set threshold value, so that the coal seam roof behind the hydraulic support group of the working face is collapsed and a goaf is filled, and the roof connection of broken stones and the pressure relief of the coal seam roof are realized.
Description
Technical Field
The invention belongs to the technical field of coal seam mining, and particularly relates to a coal face gas extraction and roof treatment method.
Background
When the overburden rock of the mined coal seam is hard and cannot be broken down in time, stress of the top plate of the coal seam is locally concentrated due to uneven stress distribution in the deep stratum caused by gullies and high mountains, so that strong mine pressure of the top plate of the coal seam is displayed, the top plate moves and the ground surface collapses, and high support stress is borne by coal bodies near a mined-out area.
In order to solve the problem of strong mine pressure of the coal seam roof, the incoming pressure of the roof needs to be forecasted, meanwhile, according to the incoming pressure condition, drilling, blasting or fracturing is carried out on the coal seam roof of a large-thickness complete hard rock stratum of a mined-out suspended roof in a roadway of a working face, the suspended roof of the roadway of the working face is made to collapse behind a support of the working face, a rock stratum with an overlying fracture zone is supported, high supporting stress in coal bodies near a mined-out area is released, the supporting stress in the coal bodies near the mined-out area is made to be small, and the roadway is protected. However, the current pressure forecast mainly depends on manual observation of a coal face and experience forecast, and has the problems of untimely and inaccurate forecast.
Disclosure of Invention
The invention mainly aims to provide a coal face gas extraction and roof treatment method, aiming at realizing advanced early warning on the development of mine pressure and realizing roof drilling, blasting and pressure relief and coal body gas extraction.
Therefore, the coal face gas extraction and roof treatment method provided by the embodiment of the invention comprises the following steps: a plurality of first drilling machines are fixedly installed in front of the working face hydraulic support group and close to a coal seam roof, the first drilling machines are arranged on the working face hydraulic support group in a row along the extending direction of a working face roadway, and the drilling direction of each first drilling machine is perpendicular to the coal seam working face;
drilling an advance hole in a coal seam on a coal seam working surface by using a first drill rod of a first drilling machine, and then blowing high-pressure liquid or gas into a bag attached to the first drill rod to expand the bag, so that the bag is attached to the wall surface of the advance hole and seals the advance hole;
the front end of the first drill rod is provided with a drill bit, an axially extending gas extraction channel is formed inside the first drill rod, one end of the gas extraction channel extends to the tail end of the first drill rod and is communicated with a gas extraction system, and the other end of the gas extraction channel is communicated with a gas extraction hole in the side part of the drill bit;
and then, normally cutting coal of the coal mining machine, starting a gas extraction system when the pressure in the bag measured by the measuring element is increased, extracting gas from the working face of the coal seam by using the first drill rod, and performing drilling blasting on the coal seam roof of the mining suspended roof in the roadway of the working face when the pressure in the bag measured by the measuring element is increased to a set threshold value, so that the coal seam roof behind the hydraulic support group of the working face is collapsed and is full of a goaf, and the roof connection of broken stones and the pressure relief of the coal seam roof are realized.
Specifically, the drill bit adopts toper reamer bit, first drilling rod inside be equipped with the route of bag intercommunication, the tail end of first drilling rod be equipped with the supplementary mouth of route intercommunication, supplementary mouth is connected with the connecting pipe through first rotary joint, connecting pipe and gas source or liquid source intercommunication, be equipped with the valve on the connecting pipe.
In particular, the measuring element is a pressure sensor arranged on the connecting tube.
Specifically, the distance between two adjacent first drilling machines is controlled to be 1.5-1.75 m.
Specifically, the gas extraction system comprises an extraction pipe and an extraction pump, one end of the extraction pipe is connected with the gas extraction channel through a second rotary joint, and the other end of the extraction pipe is connected with the extraction pump.
Specifically, the bag comprises an elastic membrane cylinder sleeved outside the first drill rod, and two ends of the elastic membrane cylinder are respectively and fixedly connected with the outer wall of the first drill rod in a sealing manner, so that an inflation or liquid filling cavity is formed between the elastic membrane cylinder and the first drill rod.
Specifically, two ends of the elastic membrane cylinder respectively extend to the front end and the tail end of the pilot hole.
Specifically, the working face hydraulic support group comprises a plurality of hydraulic supports arranged side by side along the extending direction of a working face roadway, and each hydraulic support is provided with one first drilling machine.
Specifically, a second drilling machine is installed on the back face of the shield beam at the rear end of each hydraulic support, the drilling direction of each second drilling machine is arranged in a backward inclined mode, the shield beam is provided with a through hole corresponding to a second drill rod of the second drilling machine, and the second drill rod penetrates out of the through hole to drill the coal seam roof.
Specifically, the shield beam is further provided with a driving cylinder which drives the second drilling machine to move so that the second drill rod is aligned with or staggered with the through hole, and when the second drill rod is staggered with the through hole, blasting explosives are loaded into blast holes formed by drilling the second drill rod through the through hole by a loading rod.
Compared with the prior art, at least one embodiment of the invention has the following beneficial effects:
(1) with first drilling rod attached bag, first drilling rod creeps into in advance in the working face front and sets for the back apart from, aerify or fill liquid to the bag, realize bag and the laminating of drilling wall, utilize bag perception drilling wall stress change, when treating bag internal pressure to the predetermined threshold value of early warning, the garrulous bloated nature of roof rock is passed through to the mode that adopts goaf roof blasting, be full of the goaf, realize the top that connects of rubble, and extrude the roof plate, not only can show the ore pressure at working face middle part and carry out advance early warning, realize roof drilling blasting pressure release, and when the roof cuts down suddenly, the roof can be supported to first drilling rod arranged in a row, play the step that prevents overlying strata and sink the purpose.
(2) The first drill rod is used for extracting gas in the coal body, so that the extraction safety is guaranteed, when the measuring element measures that the pressure in the bag is increased, the pressure of the coal bed top plate is indicated, the coal bed top plate extrudes the coal body of the coal face, the coal body is forced to generate an advanced crack, and the existence of the crack enlarges the gas analysis space, so that the gas can be separated out along the crack, the gas extraction amount can be increased, and the gas extraction efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic illustration of a coal mining process provided by an embodiment of the present invention;
FIG. 2 is a schematic view of a first drill rod configuration according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a hydraulic support group according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second drilling rig according to an embodiment of the present invention;
wherein: 1. a working face hydraulic support group; 101. a hydraulic support; 2. a coal seam roof; 3. a first drilling machine; 301. a first drill rod; 4. a working face roadway; 5. a coal seam working face; 6. a pouch; 7. a drill bit; 8. a gas extraction channel; 9. a gas extraction system; 901. extracting pipes; 902. an extraction pump; 10. gas extraction holes; 11. a measuring element; 12. entering a road; 13. a connecting pipe; 14. a source of gas or liquid; 15. a pumping device; 16. a second drilling machine; 161. a drill body; 162. a second drill pipe; 17. a through hole; 18. a drive cylinder; 19. and (4) covering the beam.
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 "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 and 2, a coal face gas extraction and roof treatment method includes the following steps:
firstly, a plurality of first drilling machines 3 are fixedly installed in front of a working face hydraulic support group 1 and close to a coal seam roof 2, the first drilling machines 3 are arranged on the working face hydraulic support group 1 in a row along the extending direction of a working face roadway 4, and the drilling direction of each first drilling machine 3 is vertical to a coal seam working face 5;
secondly, drilling an advance hole in the coal seam on a coal seam working surface 5 by using a first drill rod 301 of a first drilling machine 3, and then blowing high-pressure liquid or gas into a bag 6 attached to the first drill rod 301 to expand the bag 6 and attach to the wall surface of the advance hole to seal the advance hole;
the front end of the first drill rod 301 is provided with a drill bit 7, an axially extending gas extraction channel 8 is formed inside the first drill rod 301, one end of the gas extraction channel 8 extends to the tail end of the first drill rod 301 to be communicated with a gas extraction system 9, and the other end of the gas extraction channel is communicated with a gas extraction hole 10 on the side of the drill bit 7;
and step three, normally cutting coal of the coal mining machine, starting a gas extraction system 9 when a measuring element 11 measures that the pressure in a bladder 6 is increased, extracting gas from a coal seam working face 5 by using a first drill rod 301, performing drilling blasting on a coal seam roof 2 of a mining suspended roof in a working face roadway 4 when the pressure in the bladder 6 measured by the measuring element 11 is increased to a set threshold value, so that the coal seam roof 2 behind a working face hydraulic support group 1 collapses and is filled with a goaf, realizing top contact of broken stones and pressure relief of the coal seam roof 2, and moving the hydraulic support 101 towards the mining advancing direction of the working face by using a walking system of the hydraulic support 101 when the coal seam is mined at one step distance, and repeating the steps to finish all mining of the coal seam.
In this embodiment, with first drilling rod attached bag, first drilling rod creeps into behind the settlement distance in advance in the working face front, aerify the bag or fill the liquid, realize bag and the laminating of drilling wall face, utilize bag perception drilling wall face stress variation, when treating bag internal pressure to increase the predetermined threshold value of early warning, adopt the garrulous bloated nature of roof rock of the mode of goaf roof blasting, be full of the goaf, realize the top that connects of rubble, and extrude the roof, not only can show the ore pressure in working face middle part and carry out advance early warning, realize roof drilling blasting pressure release, and when the roof cuts down suddenly, the roof can be supported to first drilling rod of arranging in rows, play and prevent the step mesh that the overburden sinks.
In addition, gas in the coal body can be extracted by the aid of the first drill rod, so that the safety of extraction is guaranteed, when the pressure in the bag 6 measured by the measuring element 11 is increased, the pressure of a coal bed top plate is indicated, the coal bed top plate extrudes the coal body of the coal face, advanced cracks are generated in the coal body, gas analyzing space is enlarged due to the existence of the cracks, the gas can be separated out along the cracks, the gas extraction amount can be increased, and the gas extraction efficiency is improved.
Referring to fig. 2, in some embodiments, the drill bit 7 of the first drill rod 301 is a tapered reamer bit 7, the rod diameter of the first drill rod 301 is smaller than the large diameter end of the tapered reamer bit 7, the first drill rod 301 is internally provided with an inlet 12 communicated with the bladder 6, the tail end of the first drill rod 301 is provided with a supplementary port communicated with the inlet 12, the supplementary port is connected with a connecting pipe 13 through a first swivel joint, the connecting pipe 13 is communicated with a gas source or a liquid source 14, the connecting pipe 13 is provided with a valve, the measuring element 11 is a pressure sensor (such as a pressure gauge) arranged on the connecting pipe 13, the gas source or the liquid source 14 is arranged in the working face roadway 4, when the first drill rod 301 drills to a set distance, the connecting pipe 13 is abutted with the supplementary port, the gas or the liquid is filled into the bladder 6 by using a pumping device 15, so that the bladder 6 is expanded and is attached to the wall surface of the pilot hole, and the valve on the connecting pipe 13 is closed to keep the pressure in the bag 6 constant, when the top plate is pressed, the hole drilling starts to shrink under the action of the mine pressure, the bag 6 is compressed, the pressure in the bag 6 is increased, and when the pressure measured by the pressure sensor is increased to a preset threshold value, the pressure is released by drilling and blasting the top plate immediately, so that the purposes of preventing the top plate from moving and collapsing the ground surface and reducing the stress borne by the coal body near the goaf are achieved.
In this embodiment, the drill 7 at the front end of the first drill rod 301 is a tapered reamer 7, which can effectively prevent the bag 6 from directly contacting the wall surface of the drilled hole to cause damage during the drilling process. In addition, first drill rod 301 is fabricated from a high strength alloy so that when topping occurs, first drill rod 301 has sufficient load bearing capacity. The front end surface of the drill bit is provided with alloy teeth, and the alloy teeth can be hard alloy teeth.
Referring to fig. 1 and 3, specifically, the working face hydraulic support group 1 is composed of a plurality of hydraulic supports 101 arranged side by side along the extending direction of the working face roadway 4, each hydraulic support 101 is provided with a first drilling machine 3, and in practical design, the distance between two adjacent first drilling machines 3 is controlled to be 1.5-1.75 m.
It can be understood that, in the actual design, the gas extraction system 9 includes an extraction pipe 901 and an extraction pump 902, one end of the extraction pipe 901 is connected with the gas extraction channel 8 through a second swivel joint, the other end is connected with the extraction pump 902, and gas in the coal seam on the coal seam working face 5 enters the gas storage device to be stored after sequentially passing through the extraction hole on the drill bit 7, the gas extraction channel 8 in the first drill rod 301 and the extraction pipe 901 under the negative pressure provided by the extraction pump 902, so as to ensure the safety of coal seam mining. Wherein, for improving drainage efficiency, a plurality of drainage holes are uniformly distributed along the circumferential direction of the drill bit 7 at the front end of the first drill rod 301.
In some embodiments, the bladder 6 includes an elastic membrane cylinder sleeved outside the first drill rod 301, and two ends of the elastic membrane cylinder are respectively and fixedly connected with the outer wall of the first drill rod 301 in a sealing manner, so as to form an inflation or liquid filling cavity between the elastic membrane cylinder and the first drill rod 301, and by introducing liquid or gas into the inflation or liquid filling cavity, the elastic membrane cylinder can be forced to expand and be attached to the wall surface of the pilot hole. Wherein, in order to prevent the damage of the bag 6 during the drilling process, the elastic membrane cylinder can be made of high-elastic and high-strength materials such as rubber. In addition, when the two ends of the elastic membrane cylinder respectively extend to the front end and the tail end of the pilot hole, that is, the bag 6 is expanded and then keeps in contact with the wall of the pilot hole behind the drill bit 7 of the first drill rod 301, the design enlarges the pressure forecast range.
Referring to fig. 1 and 4, in some embodiments, a second drilling machine 16 is mounted on the back of the shield beam 19 at the rear end of each hydraulic support 101, the drilling direction of each second drilling machine 16 is set to be inclined upwards towards the rear, a through hole 17 corresponding to a second drill rod 162 of the second drilling machine 16 is provided on the shield beam 19, and the second drill rod 162 can pass through the through hole 17 to drill the coal seam roof 2. When drilling and blasting operation needs to be performed on the coal seam roof 2 behind the hydraulic support 101, only the second drill rod 162 needs to be installed on the second drill 16, the second drill 16 clamps the second drill rod 162 and drives the second drill rod 162 to rotate and drill into the coal seam roof 2, so that blast holes are formed in the coal seam roof 2 to be blasted, and then the second drill rod 162 retracts into the shield beam 19, so that explosives can be loaded into the blast holes, and blasting operation is performed on the coal seam roof 2. In order to destroy the integrity of the coal seam roof 2 as much as possible, the second drilling machine 16 drills blastholes formed to penetrate the coal seam roof 2.
Referring to fig. 4, it can be understood that, in practical application, the driving cylinder 18 for driving the second drilling machine 16 to move so as to align or stagger the second drilling rod 162 with the through hole 17 is further arranged on the shield beam 19, so that when loading is required after the drilling operation is completed, the second drilling rod 162 is retracted into the shield beam 19, the driving cylinder 18 is used for driving the second drilling machine 16 to move along the slide rail on the shield beam 19 so as to stagger the second drilling rod 162 with the through hole 17 on the shield beam 19, explosive is bound on the front end of the loading rod made of a bamboo rod or the like, the loading rod enters the goaf behind the hydraulic bracket 101 from the through hole 17, and the explosive is poked into the blast hole to be detonated, so that the blasting operation is realized. By the aid of the design mode, drilling blasting can be implemented without the need of an operator entering a goaf, and safety of operators can be effectively guaranteed.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A coal face gas extraction and roof caving roadway protection method is characterized by comprising the following steps:
a plurality of first drilling machines (3) are fixedly installed in front of the working face hydraulic support group (1) and close to the coal seam roof (2), the first drilling machines (3) are arranged on the working face hydraulic support group (1) in a row along the extension direction of a working face roadway (4), and the drilling direction of each first drilling machine (3) is perpendicular to the coal seam working face (5);
drilling an advance hole in a coal seam working surface (5) by using a first drill rod (301) of a first drilling machine (3), and then blowing high-pressure liquid or gas into a bag (6) attached to the first drill rod (301) to expand the bag (6) and attach to the wall surface of the advance hole to seal the advance hole;
a drill bit (7) is arranged at the front end of the first drill rod (301), an axially extending gas extraction channel (8) is formed inside the first drill rod, one end of the gas extraction channel (8) extends to the tail end of the first drill rod (301) and is communicated with a gas extraction system (9), and the other end of the gas extraction channel is communicated with a gas extraction hole (10) in the side portion of the drill bit (7);
and then, normally cutting coal of the coal mining machine, when the pressure in the bag (6) is measured by the measuring element (11) to be increased, starting a gas extraction system (9), extracting gas from the coal seam working face (5) by using the first drill rod (301), and when the pressure in the bag (6) measured by the measuring element (11) is increased to a set threshold value, performing drilling blasting on the coal seam roof (2) of the mining suspended roof in the working face roadway (4), so that the coal seam roof (2) behind the working face hydraulic support group (1) is collapsed and is full of a goaf, and the roof connection of broken stones and the pressure relief of the coal seam roof (2) are realized.
2. The coal face gas extraction and roof caving roadway protection method according to claim 1, characterized in that: drill bit (7) adopt toper reamer bit, first drilling rod (301) inside be equipped with route (12) of bag (6) intercommunication, the tail end of first drilling rod (301) be equipped with the supplementary mouth of route (12) intercommunication, it is connected with connecting pipe (13) through first rotary joint to supply mouthful, connecting pipe (13) and gas source or liquid source (14) intercommunication, be equipped with the valve on connecting pipe (13).
3. The coal face gas extraction and roof caving roadway protection method according to claim 2, characterized in that: the measuring element (11) is a pressure sensor arranged on the connecting tube (13).
4. The coal face gas extraction and roof caving roadway protection method according to claim 1, characterized in that: the distance between two adjacent first drilling machines (3) is controlled to be 1.5-1.75 m.
5. The coal face gas extraction and roof caving roadway protection method according to claim 1, characterized in that: the gas extraction system (9) comprises an extraction pipe (901) and an extraction pump (902), one end of the extraction pipe (901) is connected with the gas extraction channel (8) through a second rotary joint, and the other end of the extraction pipe is connected with the extraction pump (902).
6. The coal face gas extraction and roof caving roadway protection method according to claim 1, characterized in that: the bag (6) comprises an elastic membrane cylinder sleeved outside the first drill rod (301), and two ends of the elastic membrane cylinder are fixedly connected with the outer wall of the first drill rod (301) in a sealing mode respectively, so that an inflation or liquid filling cavity is formed between the elastic membrane cylinder and the first drill rod (301).
7. The coal face gas extraction and roof caving roadway protection method according to claim 6, characterized in that: two ends of the elastic membrane cylinder respectively extend to the front end and the tail end of the pilot hole.
8. The coal face gas extraction and roof caving roadway protection method according to any one of claims 1 to 7, characterized by comprising the following steps: the working face hydraulic support group (1) is composed of a plurality of hydraulic supports (101) which are arranged side by side along the extending direction of a working face roadway (4), and each hydraulic support (101) is provided with one first drilling machine (3).
9. The coal face gas extraction and roof caving roadway protection method according to claim 8, characterized in that: the back of a shield beam (19) at the rear end of each hydraulic support (101) is provided with a second drilling machine (16), the drilling direction of each second drilling machine (16) is arranged upwards in a backward inclined mode, a through hole (17) corresponding to a second drill rod (162) of each second drilling machine (16) is formed in the shield beam (19), and the second drill rod (162) penetrates out of the through hole (17) to drill a coal seam roof (2).
10. The coal face gas extraction and roof caving roadway protection method according to claim 9, characterized in that: the shield beam (19) is further provided with a driving cylinder (18) which drives the second drilling machine (16) to move so that the second drill rod (162) is aligned with or staggered with the through hole (17), and when the second drill rod (162) is staggered with the through hole (17), blasting explosives are filled into blast holes formed by drilling the second drill rod (162) through the through hole (17) through a loading rod.
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