CN113586134B - Method for controlling gas by hole-instead-of-lane combined drainage on coal seam working face - Google Patents
Method for controlling gas by hole-instead-of-lane combined drainage on coal seam working face Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005553 drilling Methods 0.000 claims abstract description 116
- 238000005065 mining Methods 0.000 claims abstract description 26
- 238000000605 extraction Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004047 hole gas Substances 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000005641 tunneling Effects 0.000 description 6
- 238000005086 pumping Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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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Abstract
The invention belongs to the technical field of gas drainage control of fully mechanized mining face, and particularly relates to a method for controlling gas drainage by combining a coal seam face with a hole instead of a roadway. According to the gas drainage drilling deployment principle, the method is used for constructing large-diameter drilling holes on the ground and underground high-position directional drilling holes, and is matched with a ground temporary gas drainage pump station system, so that the problem of gas overrun is effectively solved, safe stoping is ensured, the engineering quantity of a driving way is reduced, and the aims of reducing cost, relieving joint of working faces and the like are achieved. The method has important significance for the construction of millions of tons of intelligent mines and has good practical effect.
Description
Technical Field
The invention relates to the technical field of gas drainage and control of fully-mechanized caving face, in particular to a method for controlling gas drainage and control by using a hole instead of a roadway on a coal seam face.
Background
The gas is used as the first five disasters of the coal mine, and severely restricts the safe production of the coal mine. In recent years, with the increase of the mining depth and intensity of a coal mine, the gas content of a coal face is gradually increased, the phenomenon of gas emission in a goaf is increasingly remarkable, and how to reasonably and effectively solve the problem of gas overrun in the coal seam stoping process becomes a primary difficult problem for coal mine enterprises.
At present, the coal mining of China mainly adopts a plurality of ventilation modes such as W, U, Z, Y and the like, and combines the technical means of laying a bottom drainage roadway, a high drainage roadway and the like, so as to solve the problem of gas overrun of a working face and an upper corner thereof. However, along with the extension of the mine towards the deep part and the continuous increase of the exploitation intensity, the problems existing in the process of constructing the gas extraction roadway, such as long tunneling time, large workload, large investment, obvious influence of geological structures and the like, are also highlighted gradually. In addition, along with the stoping of the working face, the cracks of the top and bottom plates of the coal bed develop to form a crack zone, and pressure release gas generated in the cracks moves upwards along the crack zone to form upper corner gas enrichment or even overrun, so that the safety stoping of the working face is seriously affected.
Therefore, a method for controlling the gas by using hole-substituted roadway combined drainage on the coal seam working face is needed to be researched and invented. The gas control method has the advantages of controllable gas extraction drilling track, high gas extraction efficiency, large concentration, wide influence area and the like, can effectively solve the problem of overrun of gas in a return airway and an upper corner, simultaneously reduces the tunneling engineering quantity of the tunnel, and achieves the aims of reducing the cost and enhancing the efficiency.
Disclosure of Invention
The invention aims to provide a method for controlling gas by using a hole instead of a roadway to jointly pump and drain on a coal seam working face, which is used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
A method for controlling gas by using hole-substituted roadway combined drainage on a coal seam working surface comprises the following steps:
s1: determining the horizontal distance between the ground large-diameter drilling hole and the return airway according to the O-shaped ring theory of the overburden mining fracture;
S2: determining deployment intervals among holes drilled on the trend along the working surface according to the ground large-diameter drilling single-hole gas drainage control area;
s3: drilling holes with large diameters on the ground for two times;
S31: firstly, a phi 425mm roller bit is adopted, after a bedrock weathering belt is drilled through 10m, a phi 377.7mm 10mm steel grade J55 surface sleeve is put down, and a loose surface layer is sealed;
S32: drilling the second opening to 50m above the top plate of the target coal seam by using a phi 311.1mm drill bit, putting a phi 244.5mm steel grade J55 technical sleeve with the diameter of 8.94mm into the second opening, and returning well cementation cement to a goaf;
s33: thirdly, drilling by using a drill bit with the diameter of 215.9mm, and drilling to 3m above the target coal seam floor, so that the drilling is finished with naked eyes;
S4: according to the gas drainage amount of the ground drilling holes, the number of the 2BEC72 type water ring type vacuum pumps installed on the temporary gas drainage pump station is designed and selected, DN500 steel pipes are adopted to be connected with the ground drilling holes in a matched mode, and 2 drilling holes are always kept for drainage.
S5: determining vertical position distribution of high-position directional drilling according to the development height of a stratum caving zone and a fracture zone on the working surface;
s6: determining the horizontal distance between the underground high-order directional drilling hole (3) and the return airway according to the O-shaped ring theory of the overburden mining fracture;
s7: drilling by adopting a mining crawler-type full-hydraulic tunnel drilling machine;
s71: drilling holes by using a phi 89mm cable drill rod and a phi 120mm four-wing flat bottom directional drill bit;
S72: reaming to 15m using a phi 153mm drill bit;
s73: reaming to 15m using a phi 193mm drill bit;
s74: reaming to 15m using a phi 215mm drill bit;
s75: reaming to 15m by using a drill with the diameter of 250mm, wherein the water-stopping sleeve is an iron sleeve with the diameter of 220mm 1m, and is connected by screw threads, and the grouting plugging length is 15m;
S76: the directional deflecting section is utilized to enable the drilling position to reach the design horizon, then the drilling is carried out along the running direction of the working face along the horizon, and the drilling is carried out with the phi 193mm for the final hole;
S8: and (3) extracting by using a water ring type vacuum gas pump arranged in the ground gas extraction pump station, wherein the negative extraction pressure is 35-40 KPa, the total flow of the extracted mixed gas is 20-45 m < 3 >/min, and when the working face is extracted to a position 20m away from the high-position directional drilling hole, the high-position directional drilling hole is started to extract gas.
Preferably, a) the drilling holes are arranged at the upper part of the goaf caving belt and the middle lower part of the fracture belt in the vertical direction, b) the drilling holes are positioned in the mining 'O' -shaped ring at one side of the return air lane in the transverse direction, and c) the hole pitch is reasonable, so that the effective superposition of the single-hole drainage areas can be ensured.
Preferably, ground large-diameter gas drainage drilling holes are arranged in an O-shaped ring of a rock-covering mining fracture at one side of a return air gallery, the drilling holes are arranged along the trend of a working surface according to a single-hole gas drainage control area by drilling the O-shaped ring to 3m above a coal seam bottom plate, and the effective superposition of the drilling hole drainage areas is ensured.
Preferably, the surface large diameter borehole is drilled using two drilling processes.
Preferably, the ground temporary gas drainage pump station system mainly adopts 2BEC72 water ring type vacuum pumps, and is connected with a ground large-diameter gas drainage drill hole by adopting DN500 steel pipes in a matched manner, so that gas drainage of an underground comprehensive drainage working face is realized.
Preferably, the underground high-position directional drilling holes are vertically arranged in a stratum at the top of a caving zone of a coal seam roof, and horizontally arranged in an O-shaped ring of a mining-induced fracture at one side away from a return airway.
Preferably, the underground high-order directional drilling adopts a ZDY12000LD type mining crawler-type full-hydraulic tunnel drilling machine for drilling.
Preferably, the underground temporary gas drainage system adopts a 2BEC120 type water ring type vacuum gas pump arranged in a ground gas drainage pump station for drainage.
The beneficial effects of the invention are as follows:
1. by adopting the technical scheme, the tunnel engineering quantity can be effectively reduced, the engineering cost is reduced, and the problem of mine connection tension is relieved.
2. Through the multi-dimensional combined drainage of the ground large-diameter drilling hole and the underground high-position directional drilling hole, the gas content of the upper corner and the working face is ensured to be obviously lower than that of an alarm line.
3. The gas drainage technology using holes instead of roadways has the advantages of controllable drilling track, high gas drainage efficiency, large concentration, wide influence area and the like, and has good application effect.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described, and it is possible for a person skilled in the art to obtain other drawings from these drawings without inventive effort.
FIG. 1 is a plan layout of a large diameter borehole in a ground
FIG. 2 is a schematic view of the downhole high directional drilling and tapping position
FIG. 3 is a cross-sectional view of a trajectory of a downhole high directional drilling design
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a technical scheme that: the combined drainage method by using hole instead of roadway in gas treatment of fully mechanized mining face is characterized by comprising the following steps of: the method comprises the following steps:
s1: determining the horizontal distance between the ground large-diameter drilling hole and the return airway according to the O-shaped ring theory of the overburden mining fracture;
S2: determining deployment intervals among holes drilled on the trend along the working surface according to the ground large-diameter drilling single-hole gas drainage control area;
s3: drilling holes with large diameters on the ground for two times;
S31: firstly, a phi 425mm roller bit is adopted, after a bedrock weathering belt is drilled through 10m, a phi 377.7mm 10mm steel grade J55 surface sleeve is put down, and a loose surface layer is sealed;
S32: drilling the second opening to 50m above the top plate of the target coal seam by using a phi 311.1mm drill bit, putting a phi 244.5mm steel grade J55 technical sleeve with the diameter of 8.94mm into the second opening, and returning well cementation cement to a goaf;
s33: thirdly, drilling by using a drill bit with the diameter of 215.9mm, and drilling to 3m above the target coal seam floor, so that the drilling is finished with naked eyes;
S4: according to the gas drainage amount of the ground drilling holes, the number of the 2BEC72 type water ring type vacuum pumps installed on the temporary gas drainage pump station is designed and selected, DN500 steel pipes are adopted to be connected with the ground drilling holes in a matched mode, and 2 drilling holes are always kept for gas drainage.
S5: determining vertical position distribution of high-position directional drilling according to the development height of a stratum caving zone and a fracture zone on the working surface;
s6: determining the horizontal distance between the underground high-order directional drilling hole and the return airway according to the O-shaped ring theory of the overburden mining fracture;
s7: drilling by adopting a mining crawler-type full-hydraulic tunnel drilling machine;
s71: drilling holes by using a phi 89mm cable drill rod and a phi 120mm four-wing flat bottom directional drill bit;
S72: reaming to 15m using a phi 153mm drill bit;
s73: reaming to 15m using a phi 193mm drill bit;
s74: reaming to 15m using a phi 215mm drill bit;
S75: reaming to 15m by using a drill bit with the diameter of 250mm, wherein the water-stopping sleeve adopts The sleeve is connected by screw threads, and the grouting plugging length is 15m;
s76: the directional deflecting section is utilized to enable the drilling position to reach the design horizon, then the drilling is carried out along the running direction of the working face along the horizon, and a drilling end hole with phi 193mm is drilled;
S8: and (3) carrying out gas extraction by using a water ring type vacuum gas pump arranged in the ground gas extraction pump station, wherein the extraction negative pressure is 35-40 KPa, the total flow of the extracted mixed gas is 20-45 m 3/min, and when the working face is extracted to a position with a distance of 20m from the high-position directional drilling hole, the high-position directional drilling hole is started to extract the gas.
One specific application of this embodiment is:
the design trend length of a fully mechanized caving face of a certain coal mine is 2600m, the trend length is 200m, and the elevation of the face is 834-866 m. And (3) finding that a bifurcation phenomenon occurs in the coal seam occurrence during the tunnel tunneling, planning tunneling to a 1800m changed horizon according to the actual production demand, and only stoping the upper coal seam. Because the coal seam is subjected to occurrence and tunneling horizon change, if the construction of the top drainage roadway is continued, the construction is carried out in the rock roadway, and the construction speed is low, so that the mine connection is difficult to meet, the working face top drainage roadway is researched and determined to be tunneled to the position about 2080m for stopping tunneling, and the residual distance adopts a method for constructing a gas drainage drill hole, so that the problem of high gas in the fully mechanized caving face extraction process is solved.
(1) The gas drainage drill hole arrangement is characterized in that: the drilling holes are arranged at the upper part of the goaf caving belt and the middle lower part of the fracture belt in the vertical direction, b) the drilling holes are positioned in the mining O-shaped ring at one side of the return air lane in the transverse direction, and c) the hole pitch is reasonable so as to ensure that the single hole drainage areas are effectively overlapped.
(2) Referring to fig. 1, it was determined to construct a row of ground boreholes at 9m from the face return airway, 3m above the target coal seam floor. The first ground drilling hole is arranged at a distance of 30m from the cutting hole, is staggered by 9m from the return air lane, and is distributed with 1 drilling hole at intervals of 50m according to the single-hole gas drainage control area (about 25 m) along the working surface direction, and 9 drilling holes are distributed in total.
(3) A phi 425mm roller bit is used for drilling holes on the ground with large diameter, after a bedrock weathering belt is drilled through 10m, a phi 377.7mm x 10mm steel grade J55 surface sleeve is put down, and a loose layer on the earth surface is sealed; drilling the second opening to 50m above the top plate of the target coal seam by using a phi 311.1mm drill bit, putting a phi 244.5mm steel grade J55 technical sleeve with the diameter of 8.94mm into the second opening, and returning well cementation cement to a goaf; and thirdly, drilling by using a drill bit with the diameter of 215.9mm, and drilling to 3m above the target coal seam floor, so that the drilling is finished with naked eyes.
(4) 3 Large-diameter holes on the ground are drilled with the simultaneous pumping and discharging amount of 300m 3/min, and 2BEC72 type water ring vacuum pumps (1 working table for standby) are selected according to the pumping and discharging amount. The DN500 steel pipe is adopted to connect 9 holes on the ground with a 2BEC72 type water ring vacuum pump.
(5) The negative pressure of the 2BEC72 type water ring type vacuum pump is 16-101 KPa, and the rated pumping air quantity is 410m 3/min. When the working face is pushed to pass through the position of the drilling hole 5m, starting to enable the drilling hole to conduct extraction, enabling the drilling hole and stopping the 1 st drilling hole to conduct extraction when the 3 rd drilling hole is buried in the goaf 5m, and always keeping 2 drilling holes to conduct extraction, wherein the deepest extraction distance of the single-hole buried goaf is 105m.
(5) According to the advancing speed of the working face, the vertical distance between the drilling final hole and the roof of the coal seam is 3-5 times of the mining thickness, the thickness of the coal seam is 3.8m, and the height of the final hole is 11.4-19 m. In order to effectively drain the gas in the goaf and prevent the concentration of the gas at the upper corner from exceeding the limit, the arrangement of the top plate of the working face to the drill holes should be reduced to be arranged in the rock stratum at the top of the caving zone, and therefore the height between the position of the final hole of the drill hole and the vertical distance of the top plate of the coal bed is set to be 7.1-13.1 m.
(6) According to the mining-induced fracture 'O' -shaped ring theory (the peripheral width is about 34 m), the directional drilling is determined to be arranged in the range of 10.7-32.7 m from the return air roadway.
(7) Referring to fig. 2, two rows of long drill holes in the bedding layer are constructed in the 2000m drill field of the fully mechanized mining face along the central line direction of the roadway, the holes are distributed in an inverted W shape, the heights of the holes of the upper row of drill holes are 2.5m, the heights of the holes of the lower row of drill holes are 2m, 5 drill holes are deployed in total, wherein 1,2 and 3# holes are formed in the side walls of the chamber, and 4 and 5# holes are formed in the right front of the chamber.
(8) Referring to fig. 3, the final hole positions of the 5 drillings are designed as follows: the 1# drilling hole is 10.1m away from the coal seam roof and 32.7m away from the air return roadway side; the No. 2 drill hole is 13.1m away from the coal seam roof and 24.7m away from the air return roadway wall; the No. 3 drill hole is 8.6m away from the coal seam roof and 18.9m away from the air return roadway side; the 4# drilling hole is 11.8m away from the coal seam roof and 10.7m away from the air return roadway side; the No. 5 drill hole is 7.1m away from the coal seam roof and 22.4m away from the air return roadway side.
(9) The high-position directional drilling adopts a ZDY12000LD type mining crawler-type full-hydraulic tunnel drilling machine, firstly, a phi 89mm cable drill rod and a phi 120mm four-wing flat bottom directional drill bit are used for perforating, then a phi 153mm drill bit is used for reaming to 15m, then a phi 193mm drill bit is used for reaming to 15m, then a phi 215mm drill bit is used for reaming to 15m, finally a phi 250mm drill bit is used for reaming to 15m, a water-stop sleeve is an iron sleeve with the diameter of phi 220mm 1, and the water-stop sleeve is connected in a threaded manner, so that grouting plugging length is 15m. And (3) using the directional deflecting section to enable the drilling position to reach the design horizon, and then drilling along the running direction of the working face along the horizon, wherein the drilling is finished with phi 193 mm.
(10) The 5 high-position directional boreholes are mainly connected with DN350 mm steel pipes installed in return air channels by adopting phi 193mm telescopic hoses, branch pipelines in the return air channels are connected with DN900 mm gas extraction main pipelines installed in a total return air channel, and extraction is carried out by utilizing 2BEC120 type water ring type vacuum gas pumps installed in ground gas extraction pump stations.
(11) The negative pressure of the pump of the 2BEC120 type water ring type vacuum gas pump is 35-40 KPa, and the total flow of the pumped mixed gas is 20-45 m 3/min. And when the working face is extracted to the position of 20m, extracting is started until the extraction is completed.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. A method for controlling gas by using hole-substituted roadway combined drainage on a coal seam working surface is characterized by comprising the following steps of: the method comprises the following steps:
S1: determining the horizontal distance between the ground large-diameter drilling hole and the return airway according to the O-shaped ring theory of the overburden mining fracture; the drill holes are arranged at the upper part of the goaf caving belt and the middle lower part of the fracture belt in the vertical direction, and the drill holes are positioned in the mining O-shaped ring at one side of the return airway in the transverse direction, so that the reasonable hole pitch can ensure that the single-hole drainage areas are effectively overlapped;
s2: determining deployment intervals among holes drilled on the trend along the working surface according to the ground large-diameter drilling single-hole gas drainage control area; the ground large-diameter gas drainage drilling holes are arranged in an O-shaped ring of a cover rock mining fracture at one side of the return air roadway, the drilling holes are drilled to be 3m above a coal seam bottom plate, and the drilling holes are arranged along the trend of the working surface according to the single-hole gas drainage control area, so that the effective superposition of the drilling hole drainage areas is ensured;
s3: drilling holes with large diameters on the ground for two times;
S31: firstly, a phi 425mm roller bit is adopted, after a bedrock weathering belt is drilled through 10m, a phi 377.7mm 10mm steel grade J55 surface sleeve is put down, and a loose surface layer is sealed;
S32: drilling the second opening to 50m above the top plate of the target coal seam by using a phi 311.1mm drill bit, putting a phi 244.5mm steel grade J55 technical sleeve with the diameter of 8.94mm into the second opening, and returning well cementation cement to a goaf;
s33: thirdly, drilling by using a drill bit with the diameter of 215.9mm, and drilling to 3m above the target coal seam floor, so that the drilling is finished with naked eyes;
S4: according to the gas drainage amount of the ground drilling holes, the number of 2BEC72 type water ring type vacuum pumps installed on the temporary gas drainage pump station is designed and selected, DN500 steel pipes are adopted to be connected with the ground drilling holes in a matched mode, and 2 drilling holes are always kept for drainage;
s5: determining vertical position distribution of high-position directional drilling according to the development height of a stratum caving zone and a fracture zone on the working surface;
s6: determining the horizontal distance between the underground high-order directional drilling hole (3) and the return airway according to the O-shaped ring theory of the overburden mining fracture;
s7: drilling by adopting a mining crawler-type full-hydraulic tunnel drilling machine; the underground high-position directional drilling hole is vertically arranged in a stratum at the top of the caving zone of the coal seam roof, and horizontally arranged in an O-shaped ring of a mining crack at one side away from the return airway;
s71: drilling holes by using a phi 89mm cable drill rod and a phi 120mm four-wing flat bottom directional drill bit;
S72: reaming to 15m using a phi 153mm drill bit;
s73: reaming to 15m using a phi 193mm drill bit;
s74: reaming to 15m using a phi 215mm drill bit;
s75: reaming to 15m by using a drill with the diameter of 250mm, wherein the water-stopping sleeve is an iron sleeve with the diameter of 220mm 1m, and is connected by screw threads, and the grouting plugging length is 15m;
S76: the directional deflecting section is utilized to enable the drilling position to reach the design horizon, then the drilling is carried out along the running direction of the working face along the horizon, and the drilling is carried out with the phi 193mm for the final hole;
S8: and (3) extracting by using a water ring type vacuum gas pump arranged in the ground gas extraction pump station, wherein the negative extraction pressure is 35-40 KPa, the total flow of the extracted mixed gas is 20-45 m < 3 >/min, and when the working face is extracted to a position 20m away from the high-position directional drilling hole, the high-position directional drilling hole is started to extract gas.
2. The method for controlling gas by using hole-substituted roadway combined drainage on coal seam working face as claimed in claim 1, wherein the method comprises the following steps: the ground large-diameter drilling adopts a twice drilling process.
3. The method for controlling gas by using hole-substituted roadway combined drainage on coal seam working face as claimed in claim 1, wherein the method comprises the following steps: the ground temporary gas drainage pump station system mainly adopts 2BEC72 type water ring vacuum pumps, and is connected with a ground large-diameter gas drainage drill hole by adopting DN500 steel pipes in a matched mode, so that gas drainage of an underground fully-mechanized caving face is realized.
4. The method for controlling gas by using hole-substituted roadway combined drainage on coal seam working face as claimed in claim 1, wherein the method comprises the following steps: the underground high-position directional drilling adopts a ZDY12000LD type mining crawler-type full-hydraulic tunnel drilling machine for drilling.
5. The method for controlling gas by using hole-substituted roadway combined drainage on coal seam working face as claimed in claim 1, wherein the method comprises the following steps: the underground temporary gas drainage system adopts a 2BEC120 type water ring type vacuum gas pump arranged in a ground gas drainage pump station for drainage.
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