CN106285477B - Underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method - Google Patents

Underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method Download PDF

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Publication number
CN106285477B
CN106285477B CN201610770283.7A CN201610770283A CN106285477B CN 106285477 B CN106285477 B CN 106285477B CN 201610770283 A CN201610770283 A CN 201610770283A CN 106285477 B CN106285477 B CN 106285477B
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hole
plate
directional
drilling
upward
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CN106285477A (en
Inventor
李泉新
方俊
许超
刘建林
曹明
赵建国
王四
王四一
王鲜
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Xian Research Institute Co Ltd of CCTEG
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Xian Research Institute Co Ltd of CCTEG
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/26Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • E21B7/06Deflecting the direction of boreholes
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

Abstract

The present invention relates to a kind of underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method.The present invention utilizes and treats that mining face Adjacent Working Face has dug the drill site in intake, utilize the equipments such as guide's directional tool and impact compound expanding drill tool, using multi-stage rotary chambering process, slide directional drilling technique, compound directional drilling technique and the compound chambering process of impact and creep into obtain top plate to face upward and wear a layer directional hole, it is made to enter in top plate mining induced fissure band and absciss layer area in advance, and long range major diameter extends.After drilling construction, when mining face back production, roof strata by mining influence formed on face upward with top plate to crack and to wear a layer directional hole and connect, the gas for adopting movable property life enters top plate and faces upward and wears a layer directional hole, it is utilized so as to fulfill gas pumping is adopted, it solves and currently adopts the deficiencies of aperture existing for mash gas pumping drilling is small, fissure zone extended distance is short, drilling efficiency is low, of high cost, long construction period, improve and adopt gas pumping effect.

Description

Underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method
Technical field
The present invention relates to a kind of orientation hole construction method and equipments, belong to underground coal mine tunnel drilling field, specifically relate to And a kind of underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method.
Background technology
Coal mine gas disaster is one of mine construction and the main security disaster during mining production, and destructiveness is huge Greatly, very big hidden danger and loss are brought to Safety of Coal Mine Production.In recent years, the pre- extraction technology of this coal-bed gas significantly reduces work Make face coal seam gas-bearing capacity, but with the development of coal mine fully mechanized coal winning technology, the advance of the face accelerates, during exploitation Gas emission sharply increases, and becomes the key factor for restricting some mine safety high-efficiency minings.
Major part mine manages roof using caving method at present, after seam mining, in goaf overlying rock section On from the bottom to top successively there are caving zone, fissure zone and warp damage, there are the coal wall support zone of influence, absciss layers successively in plane Area, again compacting zone.Wherein there are two class cracks in fissure zone and absciss layer area:One kind is bedseparated fissures, is existed with rock depression For layer with interlayer appearance along slabbing gap, it makes coal seam generate dilatancy and make gas release, and gas pressure relief is made to be gushed along absciss layer Go out;It is another kind of for vertical fracture crack, be broken with rock depression to be formed wear slabbing gap, it is formd between upper and lower rock stratum watt The channel of this flowing.Under gas and atmospheric density difference and the collective effect of goaf air leaking so that face upper corner angle is attached A large amount of high concentration gas is populated in nearly goaf top plate crack.In the ventilation effect of negative pressure and atmospheric pressure change situation Under, the gas of roof fracture band storage may be entered by fire dam or coal column crack in exploiting field or mine laneway, be increased logical Wind is born and insecurity.
It being needed for goaf top plate development theory, gas migration rule and gas pumping, the country has carried out numerous studies, High-order lane goaf gas underground pumping method is formd, the two kinds of goaf gas undergrounds in high-order lane and High Position Drilling is formd and takes out Mining method, but high-order lane, since excavation cost is high, long construction period, Technique Popularizing is subject to certain restrictions;High Position Drilling exists Many mining areas such as China Yangquan, Shenyang, iron processes, Huainan all carry out overtesting, and achieve good effect, but due to it not Have drilling track observation and control ability, can not ensure that drilling track extends in goaf fissure zone, drilling depth is shallow and effective hole section Short, area coverage is small, and aperture is small, and quantities is big, and drilling efficiency is low, long construction period and it is of high cost the deficiencies of, it is efficient to ore deposit side Coal mining brings certain resistance.
Therefore, the present invention combines minery and goaf gas extraction needs during seam mining, for current coal mine Existing for the High Position Drilling drilling method of underground insufficient, a kind of underground coal mine of research and design, which adopts gas pumping top plate and faces upward, wears layer Hole construction method is oriented, overcomes drawbacks described above.
Invention content
The purpose of the present invention is be directed to current underground coal mine adopt mash gas pumping drilling there are aperture is small, fissure zone extension away from From the deficiencies of short, drilling efficiency is low, of high cost, long construction period, provide a kind of underground coal mine and adopt on gas pumping top plate It faces upward and wears layer orientation hole construction method.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals:
A kind of underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method, including:
It faces upward using the determining Seam Mining fissure zone of analysis and Cai Dong absciss layers area design top plate and wears the drilling of floor directional hole Track;
Before working face extraction, treat that the Adjacent Working Face of mining face has dug intake in underground according to the drilling track Trepanning and top plate of constructing, which are faced upward, in the coal seam of interior drill site wears a layer directional hole, across after overlying roof strata, into mining induced fissure band And extend over long distances;
It faces upward and is worn in the range of layer directional hole when working face extraction to top plate, faced upward using top plate and wear a layer directional hole extraction and adopt The gas of generation;Working face extraction to top plate is faced upward wear other than layer directional hole range after, stop extraction.
Optimization, a kind of above-mentioned underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method, it is described Top plate, which is faced upward, to be worn a layer directional hole and includes:
From coal seam trepanning to the casing hole section of facing upward for drilling out coal seam, trepanning inclination angle is 12-20 °, for tripping in fixed sleeving And moving casing, wherein, fixed sleeving internal diameter >=200mm, moving casing outer diameter≤150mm;
From coal seam is drilled out to the directional inclination hole section entered between mining induced fissure band, bending strength≤1 °/3m;
Along the orientation hold angle hole section of mining induced fissure band extension over long distances, inclination angle >=0 °.
Optimization, a kind of above-mentioned underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method, it is described Top plate face upward and wear layer directional hole construction quantity and arranged for several and in the plane in beaming type, and each top plate is faced upward and worn Layer directional hole is arranged in parallel along between mining induced fissure band over long distances the orientation hold angle hole section of extension, adjacent spacing of wells 7m-10m, Orientation hold angle hole section is with treating that mining face has dug distance >=15m of return aircourse, and in Cai Dong absciss layers area.
Optimization, a kind of above-mentioned underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method, it is described The distance between drill site is faced upward for top plate wears the level of orientation hold angle hole section that layer directional hole extends over long distances along mining induced fissure band Projected length.
Optimization, a kind of above-mentioned underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method,
Using revolution chambering process construction step by step, reaming when constructing from coal seam trepanning to the casing hole section of facing upward for drilling out coal seam Then tripping in sealing of hole casing after the completion is inserted into exhaust pipe and Grouting Pipe out of sealing of hole casing and hole wall annular gap, then uses The extra quality sealing material of rapid hardening polyurethane and gypsum closed orifices annular gap, inject cement after gypsum sets out of Grouting Pipe Slurry;Stop slip casting when there is cement mortar outflow in exhaust pipe, wait and coagulate several hours.
It is used from coal seam to the directional inclination hole section entered between mining induced fissure band is drilled out using guide's directional tool It slides directional drilling technique and carries out guide's directional hole construction;
Along the orientation hold angle hole section of mining induced fissure band extension over long distances compound directional drilling is used using guide's directional tool Technique carries out guide's directional hole construction.
Optimization, a kind of above-mentioned underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method, guide Directional hole drilling diameter 120mm and reach hole-enlarging hole-forming construction is carried out after projected depth, had using impact compound expanding drill, adopted With compound chambering process is impacted, hole-enlarging hole-forming diameter >=200mm after reaming to bottom hole, carries brill.
Optimization, a kind of above-mentioned underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method, it is described Guide's directional tool include sequentially connected rock stratum lead bit, the curved housing screw motor of level Four, non-magnetic drilling tool, unidirectional cutoff Pipe nipple, hollow outer flush drill stem, rotation water feeder;Wherein:The curved housing screw motor of level Four uses high pressure water-driven, head band There is certain bending angle;Aquapulse measurement while-drilling instrument is fixed in the non-magnetic drilling tool, can in real time be measured in drilling process Drilling track, and aperture is transmitted signals to high pressure water using drilling, obtain drilling drilling trajectory;Pacify in unidirectional cutoff pipe nipple Equipped with inlet non return check valve.
Optimization, a kind of above-mentioned underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method, it is described Impact compound expanding drill tool include:Sequentially connected guider, spiral reaming bit, straight-through screw motor, hydraulic impacter, Centralizer, unidirectional cutoff pipe nipple, hollow outer flush drill stem, rotation water feeder;Wherein guider top is spherical structure, and surrounding milling is washed There is spiral wing, and welding-on has hard alloy gauge;Straight-through screw motor is using high pressure water-driven, and angle of bend is 0 °, straight Leading to has stabilizer between screw motor elbow and motor assembly, the outer diameter of stabilizer and centralizer is less than the outer of spiral reaming bit Diameter.
Therefore, the present invention establishes multi-stage rotary chambering process, slides and determine using drill site in mining face return aircourse is treated It faces upward to drilling process, compound directional drilling technique and the compound chambering process of impact and corresponding construction equipment drilling top plate and wears layer The technical solution of directional hole realizes major diameter directional drilling construction in top plate mining induced fissure band and absciss layer area, and big over long distances Diameter extends, and significantly improves and adopts gas pumping effect, the safe and efficient back production in safeguard work face has the following advantages:(1) it is treating It can at a distance construct in Adjacent Working Face intake before mining face return aircourse is non-through, save work to be adopted The face back production preparatory period;(2) drilling diameter is big, and drilling efficiency is high;(3) drilling area coverage is big, and probing workload is small, Shao Liangding Plate, which is faced upward, to be worn a layer directional hole work face goaf domain gas pumping can be realized;(4) increase drilling mining induced fissure band and from Effective hole section in floor area, improves drilling utilization rate;(5) extraction can be carried out to upper adjacent layers gas simultaneously, to top plate geology Construction is detected, is unrestrained to the progress of top plate water content.
Description of the drawings
Fig. 1 is that top plate faces upward and wears a layer directional hole floor plan.
Fig. 2 is that top plate faces upward and wears a layer directional hole section layout drawing.
Fig. 3 is guide's directional tool combination connection diagram.
Fig. 4 is impact compound expanding drill tool combination connection diagram.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
In figure, treat that mining face 1, intake 2, return aircourse 3, drill site 4, top plate are faced upward and wear layer directional hole 5, adopt and split Gap band 6, Cai Dong absciss layers area 7, rock stratum lead bit 8, the curved housing screw motor 9 of level Four, non-magnetic drilling tool 10, unidirectional cutoff pipe nipple 11st, hollow outer flush drill stem 12, rotation water feeder 13, guider 14, spiral reaming bit 15, straight-through screw motor 16, punching of surging Hit device 17, centralizer 18, stabilizer 19, casing hole section of facing upward a, directional inclination hole section b, orientation hold angle hole section c.
Embodiment:
Below by embodiment, with reference to attached drawing, detailed description of embodiments of the present invention.Wherein,
Embodiment:
Referring to Fig. 1, Fig. 2, a kind of coal mine underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method, It is characterized in that, includes the following steps:
Step 1:Drill site 4 prepares.The Adjacent Working Face of mining face 1 is treated in underground, and to have dug developing in intake 2 multiple Drill site 4, the distance of adjacent drill site 4 is faced upward equal to top plate wears the orientation hold angle hole section c floor projection length of layer directional hole 5.
Step 2:Drilling design.According to mine coal seam top plate preservation situation and recovery scheme, using existing modeling point The methods of analysis and theoretical formula method, determines roof strata mining overburden changing rule, obtains roof strata section after seam mining On 6 range of fissure zone and plane on 7 range of absciss layer area, complete top plate and face upward and wears 5 Trajectory Design of layer directional hole.
Step 3:Casing hole section of facing upward a constructs.Casing hole section of facing upward a is using revolution chambering process construction step by step, i.e., first sharp Φ 120mm guide's collar apertures are crept into set pipe construction drilling tool one, then use two reaming of set pipe construction drilling tool instead to Φ 153mm, then Using set three reaming of pipe construction drilling tool to Φ 215mm.After the completion of reaming, first tripping in 9mPVC sealing of hole casings, then from PVC sealing of holes Exhaust pipe and Grouting Pipe are inserted into the annular gap of casing and hole wall, exhaust pipe is inserted into sleeve bottom, and Grouting Pipe is inserted into cyclic annular Gap, then using the extra quality sealing material of rapid hardening polyurethane and gypsum closed orifices annular gap, from note after gypsum sets Injection cement mortar in slurry pipe;Stop slip casting when there is cement mortar outflow in exhaust pipe, wait 8 hours solidifying.
Step 4:Guide's directional hole is constructed.Opening arrangement is connected, is constructed using guide's directional tool, orientation is made Inclined hole section b uses compound directional drilling construction technology using directional drilling construction technology, orientation hold angle hole section c is slided;Guide determines To hole drilling diameter 120mm, after reaching projected depth, brill is carried.
Step 5:Hole-enlarging hole-forming.It is constructed using compound expanding drill tool combination is impacted, using the compound reaming work of impact Skill, hole-enlarging hole-forming diameter >=200mm after reaming to bottom hole, carry brill.
Step 6:The complete hole of casing.Tripping in activity steel sleeve connects aperture gas pumping device to rock stratum 3m is entered.
Step 7:Region overlay.Step 3~step 6 is repeated, completes to treat whole top plates of 1 all drill sites 4 of mining face It faces upward and wears layer directional hole 5,1 return side absciss layer area 7 of mining face is treated in covering.
Step 8:Adopt gas pumping.Working face extraction to top plate, which is faced upward, to be worn in the range of layer directional hole 5, using on top plate It faces upward and wears the gas that movable property life is adopted in 5 extraction of layer directional hole;Working face extraction to top plate is faced upward wear other than 5 range of layer directional hole after, stop Movable steel sleeve in hole is taken out in only extraction.
The top plate, which is faced upward, wears trepanning of facing upward from coal seam on 5 section of layer directional hole, across after overlying roof strata, into Enter mining induced fissure area and extend over long distances;The casing hole section a that faces upward, directional inclination hole section b, orientation hold angle hole section c tri- can be divided into Point.Casing hole section of wherein facing upward a refers to from coal seam trepanning to the hole section drilled out between coal seam, 12~20 ° of trepanning inclination angle, tripping in one Grade fixed sleeving and level-one moving casing, fixed sleeving internal diameter >=200mm, moving casing outer diameter≤150mm;Directional inclination hole section B is to drill out coal seam to the hole section entered between mining induced fissure band 6, hole deviation intensity≤1 °/3m;Orient hold angle hole section c For the hole section extended over long distances along mining induced fissure band 6, inclination angle >=0 °;Top plate, which is faced upward, to be worn layer directional hole 5 and laps one another, adjacent drill site The 4 drilling laps of splice are the sum of the floor projection length of casing hole section a and directional inclination hole section b of facing upward.
The top plate, which is faced upward, to be worn layer directional hole 5 and constructs quantity >=3, and particular number is according to treating 1 absciss layer area 7 of mining face Width determines;It arranges in beaming type in plane, is arranged in parallel between orientation hold angle hole section c, adjacent spacing of wells 7m~10m, with Treat that mining face 1 has dug distance >=15m of return aircourse 3, and in absciss layer area.
Set pipe construction drill assembly one described in step 3 by Φ 120mm rock stratum lead bit 8 and hollow outer flush drill stem 12 according to Secondary connection composition;The set pipe construction drill assembly two by Φ 120mm guiders, the common reaming bits of Φ 120/153mm and Hollow outer flush drill stem 12 is sequentially connected composition;Drill assembly three of constructing is by Φ 153mm guiders, the common reamings of Φ 153/215mm Drill bit and hollow outer flush drill stem 12 are sequentially connected composition.
The top plate, which faces upward to wear when layer directional hole 5 is constructed, treats that mining face 1 does not start to exploit, and mining induced fissure band 6 and adopts Dynamic absciss layer area 7 is stablizes rock stratum;After the completion of drilling construction, when 1 back production of mining face, working face top top plate is by mining influence Slump ruptures to form mining induced fissure band 6 and Cai Dong absciss layers area 7, on face upward to crack with top plate and wear layer directional hole 5 and connect, The gas for adopting movable property life along crack enters top plate under negative pressure extraction, big flow ventilation and gravity and faces upward and wears layer directional hole 5, It is utilized so as to fulfill gas pumping.
Referring to Fig. 3, guide's directional tool described in step 4 is combined by Φ 120mm rock stratum lead bit 8, the curved housing of level Four Screw motor 9, non-magnetic drilling tool 10, unidirectional cutoff pipe nipple 11, hollow outer flush drill stem 12, rotation water feeder 13 are sequentially connected composition, The curved housing screw motor 9 of the Φ 89mm level Four uses high pressure water-driven, and outer diameter is Φ 89mm, and angle of bend is 1.25 °, is turned round Square >=1000Nm;Aquapulse measurement while-drilling instrument is fixed in non-magnetic drilling tool 10, drilling rail can be measured in real time in drilling process Mark, and aperture is transmitted signals to high pressure water using drilling, drilling drilling trajectory is obtained, reference is provided for directional drilling;It is single Inlet non return check valve is installed into cut-off pipe nipple 11, hollow outer flush drill stem 12 and top plate can be avoided to face upward and wear water in layer directional hole 5 It is flow backwards from hollow outer flush drill stem 12, one is added every 100m;Hollow 12 outer diameter of outer flush drill stem be Φ 89mm, anti-twisting property >= 35000Nm, tensile capacity >=1500kN.The slip directional drilling technique refers in drilling process, hollow outer flush drill stem 12 It does not rotate, the curved housing screw motor 9 of level Four drives Φ 120mm rock stratum lead bit 8 to turn round detritus towards assigned direction.Described answers It closes directional drilling to refer in drilling process, the hollow outer flush drill stem 12 of aperture drilling machine driving drives Φ 120mm rock stratum lead bit 8 While turning round detritus, the curved housing screw motor 9 of level Four moves Φ 120mm rock stratum lead bit 8 in high pressure water-driven lower band in hole Turn round detritus.
Referring to Fig. 4, the impact compound expanding drill tool described in step 5 is combined by guider 14, spiral reaming bit 15, is led directly to Screw motor 16, hydraulic impacter 17, centralizer 18, unidirectional cutoff pipe nipple 11, hollow outer flush drill stem 12, rotation water feeder 13 It is sequentially connected composition;Wherein 14 length of guider >=0.4m, outer diameter 110mm, top are spherical structure, and spiral has been washed in surrounding milling Wing, and welding-on has hard alloy gauge;15 outer diameters of spiral reaming bit >=200mm;Straight-through screw motor 16 uses high pressure water Driving, outer diameter 89mm, angle of bend are 0 °, there is stabilizer 19, the outer diameter of stabilizer 19 between its elbow and motor assembly It is smaller 1mm than the outer diameter of spiral reaming bit 15;The outer diameter of centralizer 18 is smaller 1mm than the outer diameter of spiral reaming bit 15;It is unidirectional to cut No-go nipple 11 adds one every 100m.The compound chambering process of impact refers in reaming procedure that aperture drilling machine drives and hole The interior driving of straight-through screw motor 16 combines, and while spiral reaming bit 15 turns round detritus, hydraulic impacter 17 drives spiral shell in hole It revolves reaming bit 15 and impacts detritus.
Treat that mining face 1, intake 2, return aircourse 3, drill site 4, top plate are faced upward and worn although being used more herein Floor directional hole 5, mining induced fissure band 6, Cai Dong absciss layers area 7, rock stratum lead bit 8, the curved housing screw motor 9 of level Four, non-magnetic drilling tool 10th, unidirectional cutoff pipe nipple 11, hollow outer flush drill stem 12, rotation water feeder 13, guider 14, spiral reaming bit 15, straight-through spiral shell Bar motor 16, hydraulic impacter 17, centralizer 18, stabilizer 19, casing hole section of facing upward a, directional inclination hole section b, orientation hold angle The terms such as hole section c, but it does not preclude the possibility of using other terms.The use of these items is only for more easily describe With the essence for explaining the present invention;Any one of the additional limitations is construed as all to disagree with spirit of the present invention.

Claims (7)

1. a kind of underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method, which is characterized in that including:
It faces upward using the determining Seam Mining fissure zone (6) of analysis and Cai Dong absciss layers area (7) design top plate and wears floor directional hole (5) Drilling track;
Before working face extraction, treat that the Adjacent Working Face of mining face (1) has dug intake in underground according to the drilling track (2) trepanning and top plate of constructing faces upward and wears a layer directional hole (5) in the coal seam of interior drill site (4), across after overlying roof strata, into adopting Dynamic fissure zone (6) simultaneously extends over long distances;
It faces upward and is worn in the range of a layer directional hole (5) when working face extraction to top plate, faced upward using top plate and wear a layer directional hole (5) extraction and adopt The gas of movable property life;Working face extraction to top plate is faced upward wear other than a layer directional hole (5) range after, stop extraction;
The distance between wherein described drill site (4) is faced upward for top plate wears a layer directional hole (5) along the extension over long distances of mining induced fissure band Orient the floor projection length of hold angle hole section.
2. a kind of underground coal mine according to claim 1 adopt gas pumping top plate face upward wear layer orientation hole construction method, It is characterized in that, the top plate faces upward and wears a layer directional hole (5) and include:
From coal seam trepanning to the casing hole section of facing upward for drilling out coal seam, trepanning inclination angle is 12-20 °, for tripping in fixed sleeving and work Dynamic casing, wherein, fixed sleeving internal diameter >=200mm, moving casing outer diameter≤150mm;
From coal seam is drilled out to the directional inclination hole section entered between mining induced fissure band, bending strength≤1 °/3m;
Along the orientation hold angle hole section of mining induced fissure band extension over long distances, inclination angle >=0 °.
3. a kind of underground coal mine according to claim 1 adopt gas pumping top plate face upward wear layer orientation hole construction method, It is characterized in that, the top plate, which is faced upward, wears a layer directional hole (5) construction quantity for several and in the plane in beaming type cloth It puts, and each top plate faces upward and wears a layer directional hole (5) along parallel cloth between mining induced fissure band over long distances the orientation hold angle hole section of extension It puts, adjacent spacing of wells 7m-10m, orient hold angle hole section and treats that mining face (1) has dug distance >=15m of return aircourse (3), And in Cai Dong absciss layers area (7).
4. a kind of underground coal mine according to claim 1 adopt gas pumping top plate face upward wear layer orientation hole construction method, It is characterized in that,
It is completed when constructing from coal seam trepanning to the casing hole section of facing upward for drilling out coal seam using the construction of revolution chambering process, reaming step by step Then tripping in sealing of hole casing afterwards is inserted into exhaust pipe and Grouting Pipe, then using rapid hardening out of sealing of hole casing and hole wall annular gap The extra quality sealing material of polyurethane and gypsum closed orifices annular gap, inject cement mortar after gypsum sets out of Grouting Pipe;When Stop slip casting when having cement mortar outflow in exhaust pipe, wait and coagulate several hours;
From coal seam is drilled out slip is used using guide's directional tool to the directional inclination hole section entered between mining induced fissure band Directional drilling technique carries out guide's directional hole construction;
Along the orientation hold angle hole section of mining induced fissure band extension over long distances compound directional drilling technique is used using guide's directional tool Carry out guide's directional hole construction.
5. a kind of underground coal mine according to claim 4 adopt gas pumping top plate face upward wear layer orientation hole construction method, It is characterized in that, guide directional hole drilling diameter 120mm and reaching hole-enlarging hole-forming construction being carried out after projected depth, impact is used Compound expanding drill has, and using compound chambering process is impacted, hole-enlarging hole-forming diameter >=200mm after reaming to bottom hole, carries brill.
6. a kind of underground coal mine according to claim 4 adopt gas pumping top plate face upward wear layer orientation hole construction method, It is characterized in that, guide's directional tool includes sequentially connected rock stratum lead bit (8), the curved housing screw motor of level Four (9), non-magnetic drilling tool (10), unidirectional cutoff pipe nipple (11), hollow outer flush drill stem (12), rotation water feeder (13);Wherein:Described four The curved housing screw motor (9) of grade carries certain bending angle using high pressure water-driven, head;It is fixed in the non-magnetic drilling tool (10) There is aquapulse measurement while-drilling instrument, drilling track can be measured in real time in drilling process, and utilize drilling high pressure water by signal Aperture is transferred to, obtains drilling drilling trajectory;Inlet non return check valve is installed in unidirectional cutoff pipe nipple (11).
7. a kind of underground coal mine according to claim 5 adopt gas pumping top plate face upward wear layer orientation hole construction method, It is characterized in that, the impact compound expanding drill tool includes:Sequentially connected guider (14), spiral reaming bit (15), Straight-through screw motor (16), hydraulic impacter (17), centralizer (18), unidirectional cutoff pipe nipple (11), hollow outer flush drill stem (12), Rotate water feeder (13);Wherein guider (14) top is spherical structure, and spiral wing has been washed in surrounding milling, and welding-on has hard conjunction Golden gauge;Straight-through screw motor (16) is using high pressure water-driven, and angle of bend is 0 °, in straight-through screw motor (16) elbow and horse Up to there is stabilizer (19) between assembly, the outer diameter of stabilizer (19) and centralizer (18) is less than the outer of spiral reaming bit (15) Diameter.
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