CN113494312A - Facility for eliminating water accumulation threat of adjacent goaf of working face and implementation scheme - Google Patents
Facility for eliminating water accumulation threat of adjacent goaf of working face and implementation scheme Download PDFInfo
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- CN113494312A CN113494312A CN202110944057.7A CN202110944057A CN113494312A CN 113494312 A CN113494312 A CN 113494312A CN 202110944057 A CN202110944057 A CN 202110944057A CN 113494312 A CN113494312 A CN 113494312A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 238000009825 accumulation Methods 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 113
- 239000003245 coal Substances 0.000 claims abstract description 38
- 230000001174 ascending effect Effects 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 9
- 230000008030 elimination Effects 0.000 claims description 8
- 238000003379 elimination reaction Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 6
- 238000005065 mining Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003657 drainage water Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000010408 sweeping 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
- E21F16/00—Drainage
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Abstract
The invention discloses a facility for eliminating the water accumulation threat of adjacent goafs on a working surface and an implementation scheme, wherein the facility for eliminating the water accumulation threat of the adjacent goafs comprises a plurality of drilling machine chambers which are arranged at the coal wall part of one side, close to the adjacent goafs, of a transportation crossheading or a return air crossheading of one working surface, the drilling machine chambers are sequentially arranged at intervals from high to low along the transportation crossheading or the return air crossheading of the working surface according to the fluctuation condition of a roadway bottom plate, a plurality of drill holes are arranged in each drilling machine chamber, and the drill holes extend from the drilling machine chambers into coal beds of the adjacent goafs; wherein overlook downwards from the tunnel top, have the contained angle between a plurality of drilling of every rig chamber, and all have an ascending contained angle between a plurality of drilling and the tunnel bottom plate. The device for eliminating the water accumulation threat of the adjacent goaf on the working face can effectively drain the water accumulation of the adjacent goaf on the working face and thoroughly eliminate the water accumulation threat of the goaf.
Description
Technical Field
The invention relates to the field of coal mine fully mechanized mining area maintenance, in particular to a facility and a scheme for eliminating the threat of accumulated water in a goaf adjacent to a working face.
Background
The coal seam of the coal mine often contains water with different degrees, and if the water in each layer is not scientifically dredged, the comprehensive mining is inconvenient. For example, the working face of the western coal mine 1119 is located on the west wing of a mining area, the north of the working face is adjacent to the 1121 working face goaf, the south is adjacent to the 1117 working face which is completely mined, the east side is a mining area centralized auxiliary downhill extending roadway, and the west side is a well field boundary. The length of the working surface is 1250m, and the width of the working surface is 150 m. The working face is used for mining a No. 4 coal seam, the coal seam is medium in structure, the overall form is a small syncline structure, and the middle of the working face is located on a syncline shaft portion.
The south side of the 1119 working surface is a 1117 goaf, an inter-surface coal pillar is reserved for 27m, and the water inflow of the goaf is 93m3H is used as the reference value. According to the analysis and calculation of the contour lines of the elevations of the coal bed bottom plates of the 1117 and 1119 working surfaces, the accumulated water area 223400m of the 1117 goaf2Amount of accumulated water 179159m3The maximum position of the coal pillar between the two working surfaces, which bears the accumulated water pressure, is positioned at the lowest point of the back flow, the maximum water head bearing height is 16.9m, and the maximum water pressure is 0.169 Mpa.
At present, the situation of lateral water seepage of a local goaf occurs at the lowest point of a return air crossheading of a 1119 working face, accumulated water in a goaf of an adjacent working face can seep into the 1119 working face through a local crack to become a direct water filling source of the working face, and in order to ensure safe mining of the 1119 working face, the accumulated water in the goaf of the 1117 working face is determined to be drained so as to thoroughly eliminate the threat of the accumulated water in the goaf.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a facility for eliminating the water accumulation threat of a working surface adjacent goaf, which can effectively drain the water accumulation of the working surface adjacent goaf and thoroughly eliminate the water accumulation threat of the goaf.
Another object of the present invention is to provide an embodiment of a goaf water accumulation threat elimination facility adjacent to a working surface, which can safely and effectively ensure the installation and implementation of the elimination facility and respond to certain effects.
In order to achieve the purpose, the invention provides a facility for eliminating the accumulated water threat of adjacent goafs of a working surface, which comprises a plurality of drilling machine chambers, a plurality of drilling machine chambers and a plurality of drill holes, wherein the drilling machine chambers are arranged at the coal wall part of one side, close to the adjacent goaf, of a transportation crossheading or a return air crossheading of the working surface, the drilling machine chambers are sequentially arranged at intervals from high to low along the transportation crossheading or the return air crossheading of the working surface according to the fluctuation condition of a roadway bottom plate, a plurality of drill holes are arranged in each drilling machine chamber, and the drill holes extend from the drilling machine chambers to the coal bed of the adjacent goaf; wherein overlook downwards from the tunnel top, have the contained angle between a plurality of drilling of every rig chamber, and all have an ascending contained angle between a plurality of drilling and the tunnel bottom plate.
In a preferred embodiment, the number of boreholes is the same for each drilling rig chamber.
In a preferred embodiment, the number of boreholes varies from one drilling rig chamber to another.
In a preferred embodiment, the angles between the plurality of boreholes of each drilling rig chamber are equal.
In a preferred embodiment, the angles between the plurality of boreholes in each drilling rig chamber are unequal.
In a preferred embodiment, the diameter of the inner section of each borehole on the side adjacent the drilling rig chamber is greater than the diameter of the outer section on the side adjacent the adjacent gob.
In a preferred embodiment, the facility for eliminating the water accumulation threat of the adjacent goaf of the working face further comprises a casing, a perforated pipe and cement paste; the sleeve is embedded in the inner section of the drill hole; the floral tube is embedded in the outer section of the drill hole; and a cement slurry is grouted between the casing and the inner section of the borehole.
In a preferred embodiment, the facility for eliminating the water accumulation threat of the adjacent goaf on the working face further comprises a connection control device, and the connection control device comprises a tee joint, a gate valve and a pressure gauge: one end of the tee joint is hermetically connected with the sleeve; the gate valve is connected with the other end of the tee joint; the pressure gauge is arranged at the third end of the tee joint.
In a preferred embodiment, the facility for eliminating the risk of water accumulation in the gob adjacent the working surface further comprises a plurality of water sumps, one for each rig chamber.
In order to achieve the other object, the present invention further provides an embodiment of a goaf waterlogging elimination facility adjacent to a working surface, including: a plurality of drilling machine chambers are arranged on the coal wall of one side, close to the adjacent goaf, of the transportation crossheading or the return air crossheading of one working face; drilling a plurality of drill holes in each drilling machine chamber towards the direction of the coal seam of the adjacent goaf by using a drilling machine, wherein included angles exist among the plurality of drill holes in the same drilling machine chamber, and the included angle between each drill hole and the coal wall on one side of the adjacent goaf is smaller than 90 degrees; drilling an inner section close to one side of the drilling machine chamber by adopting a drill bit with a first diameter in each drilling hole, then inserting a sleeve into the inner section, and pouring cement slurry into a gap between the sleeve and the inner section of the drilling hole for fixing the pipe; when the cement slurry is poured for 24 hours, drilling an outer section far away from one side of the drilling machine chamber by using a drill bit with a second diameter, wherein the outer section extends into the coal seam of the adjacent goaf, and the second diameter is smaller than the first diameter; then, carrying out a pressure test step of 1Mpa for 30 minutes on each drilled hole, and ensuring that the periphery of the hole is qualified without water leakage; installing a flange, a tee joint, a gate valve and a pressure gauge at the end part of the sleeve of each drill hole; and each drilling machine chamber is provided with a water sump, and the specifications of the water sumps at the drilling machine chambers are different.
Compared with the prior art, the facility for eliminating the threat of accumulated water in the adjacent goaf of the working face and the implementation scheme have the following beneficial effects: according to the scheme, a plurality of drilling machine chambers are arranged at the coal wall part of one side, close to the adjacent goaf, of a transportation crossheading or a return air crossheading of a working face according to the height trend in a roadway; drilling a plurality of drill holes in each drilling machine chamber towards the direction of the coal seam of the adjacent goaf by using a drilling machine, wherein included angles exist among the plurality of drill holes in the same drilling machine chamber, and the included angle between each drill hole and the coal wall on one side of the adjacent goaf is smaller than 90 degrees; and drilling an inner section close to one side of the drilling machine chamber in each drilling hole, inserting a sleeve into the inner section, pouring cement slurry into a gap between the sleeve and the inner section of the drilling hole for fixing the pipe, and drilling an outer section far away from one side of the drilling machine chamber, wherein the outer section extends into the coal seam of the adjacent goaf. And the end of the sleeve is additionally provided with a connection control device and a water storage bin for storing water is arranged at each drilling machine chamber. This scheme is through the aforesaid elimination setting and embodiment, can effectually dredge the adjacent collecting space area ponding of working face and put, thoroughly eliminates collecting space area ponding threat, guarantees the safety in production of each working face simultaneously.
Drawings
FIG. 1 is a schematic view of a working surface drainage configuration according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken at I-I of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line II-II of FIG. 1;
FIG. 4 is a schematic view of a staged drainage level according to an embodiment of the invention;
fig. 5 is an enlarged schematic view of a drilling structure according to an embodiment of the present invention.
Description of the main reference numerals:
1-1119 return air gateway, 2-sump, 3-drilling machine chamber, 5-1117 transportation gateway, 6-1117 goaf, 101, 102, 103, 201, 202, 203-drilling hole, 1021, 2021-sleeve, 1022, 2022-connection control device.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 1 to 3, a facility for eliminating the risk of water accumulation in the adjacent goaf of the working face according to the preferred embodiment of the invention comprises a plurality of drilling machine chambers 3 which are arranged at the coal wall of one side of the transportation gateway or the return air gateway of the working face, close to the adjacent goaf, and are sequentially arranged at intervals along the transportation gateway or the return air gateway of the working face from high to low according to the fluctuation condition of a roadway floor, a plurality of drilling holes are arranged in each drilling machine chamber, and the drilling holes extend from the drilling machine chamber to the coal seam of the adjacent goaf; wherein overlook downwards from the tunnel top, have the contained angle between a plurality of drilling of every rig chamber, and all have an ascending contained angle between a plurality of drilling and the tunnel bottom plate. In addition, a sump 2 is provided at each rig chamber for storing drained coal seam water.
The following will describe in detail the elimination facility and the embodiment of the goaf water accumulation threat of the working face of the western coal mine 1119 and the adjacent working face 1117 as an example.
1. Drainage water position and method
Referring to fig. 1, the 1119 working face return air gateway 1 is located at one side of the 1117 working face gob 6, and water drainage is performed on accumulated water in the gob by constructing water drainage drill holes (101, 102, 103, 201, 202 and 203) from the 1119 working face return air gateway 1 to the 1117 working face gob 6. In order to ensure the construction safety of draining water, a goaf water exploring and draining drill hole is constructed from high to low, the water level is gradually reduced by subsection draining, a specific drilling machine chamber position is generally set according to the height trend in a roadway, the highest point and the lowest point of a certain section are generally provided with corresponding drilling machine chambers, and the specific water exploring and draining engineering is laid according to the following principle:
according to the accumulated water height of the goaf being 16.9m, the accumulated water in the goaf is drained in two sections.
1) The target elevation of the first group of water detecting and discharging drill holes is +958.4m, the position is about 19m inward from the No. 6 measuring point of the 1119 working surface air return gateway, and the functions of determining the elevation of accumulated water in the goaf and reducing the accumulated water level are achieved; the second group of exploration and drainage drill holes are positioned at the lowest point of the goaf (the position of the return air along the groove towards the inclined shaft part sump), and accumulated water in the goaf is drained to the elevation close to the lowest point of the return bottom plate of the 1119 working surface.
2) Constructing a drilling machine chamber and a water sump at a drilling site, wherein the specification of the drilling machine chamber of the No. 1 drilling field is as follows: the length is about 5 multiplied by 3m, and the specification of the water sump is as follows: length x width x depth is about 4 x 2.5 x 1.5m, and the volume of the water sump is 13.5m3(ii) a The specification of the drilling rig chamber of the No. 2 drilling site is as follows: the length is about 6 multiplied by 4m, and the water sump specification is as follows: length x width x depth is about 6 x 4 x 1.5m, and the volume of the water sump is 36m3The angle of azimuth of the distributed drilling holes is generally smaller than 90 degrees with the coal wall. In principle, the specification and size of each water sump are matched with the drainage quantity of the drilling machine chamber, and the volume of the water sump at the lower position is larger.
Although the drilling machine chamber of the embodiment is arranged on the 1119 return air gateway side, the invention is not limited to this, and the drilling machine chamber can also be arranged on the transportation gateway side according to actual needs.
2. Borehole layout
Referring to fig. 2 and fig. 3, the goaf drainage follows the principle of "gradual drainage", and 2 groups of drill holes are arranged according to the fluctuation of the roadway floor to drain water in the 1117 goaf, and the drilling parameters are shown in table 1.
Table 1 drilling parameters summary
According to the construction condition of a working face, the drilling construction sequence is 101-203, and after the water pressure of 101-103 drill holes is reduced to be below 0.089MPa, 201-203 drill holes are constructed to drain water. The elevation of the 1119 working face is slightly higher than that of the 1117 goaf as a whole, so that the drainage effect of the drilled hole is guaranteed, the drilled hole is designed to be a hole which goes up the mountain by about +5 degrees, if the drainage effect of the constructed drilled hole is not good, the drilled hole can continuously drill for 10-15 m, if the design effect cannot be achieved, the original hole can be sealed, and the azimuth angle is changed at the same position to construct the drilled hole again until the drainage effect of the design is achieved. In this embodiment, three drill holes are formed in the drill site No. 1 and the drill site No. 2, and the included angle between the drill holes is about 45 degrees, but the present invention is not limited thereto, and the number of the drill holes in each drilling machine chamber and the included angle between the drill holes are not necessarily the same.
3. Single hole design
The structural parameters of the underground drainage borehole are shown in table 2, and the structure is shown in fig. 5 (the borehole diameter and the water stop casing hole diameter can be properly adjusted according to the site).
TABLE 2 gob drilling related parameters List
The drilling construction process comprises the following steps:
firstly, opening: and (3) drilling a hole with the diameter of 153mm in a measure roadway to the position of 15.5m (an inner section), inserting a seamless steel pipe with the diameter of 108mm (casing pipes 1021 and 2021), and fixing the pipe by using cement.
Opening two: drilling to the final hole depth (inner section) with the diameter of 94mm, and in order to prevent water burst in the hole from being out of control, connecting control devices (1022, 2022) such as a flange plate, a gate valve, a tee joint, a pressure gauge and the like are arranged at the hole opening. And (4) selecting whether the floral tube needs to be put into according to the stable water quantity condition of the final hole, and if so, putting the floral tube into the final hole.
After cement slurry injected into the hole is solidified for 24 hours, the fixed pipe is used
And (3) sweeping the hole by the drill bit by the length exceeding the length of the orifice pipe, and performing a clean water pressure test, wherein the test pressure is 1Mpa, the test lasts for 30min, the periphery of the orifice is not water-tight, the orifice pipe is qualified after being inactivated, and otherwise, grouting reinforcement is required again until the pressure test is qualified.
The tee joint, the gate valve, the pressure gauge and other connection control devices are additionally arranged on the hole opening of the drainage hole, so that the pressure of accumulated water in the goaf can be monitored in real time when the gate valve is closed, the elevation of the accumulated water can be converted, and the water quantity can be estimated.
4. Construction machine and material
4.1 drilling machine: the model of the drilling machine is ZDY4200LPS type crawler drilling machine.
4.2 grouting pump: an ZBQ-27/1.5 type grouting pump was used.
4.3 hole sealing material: hole sealing bags and No. 525 cement paste are adopted for hole sealing.
4.4 orifice tube: a seamless steel pipe with the diameter of phi 108mm is adopted, and a tee joint, a gate valve and a pressure gauge are arranged at an orifice.
5. Water discharge estimation
Estimating the total accumulated water volume of the goaf by adopting the following formula according to the accumulated water elevation and the accumulated water range of the current 1117 working surface: w ═ KMS/cos α
In the formula: w-water accumulation in goaf, m3(ii) a K is the water filling coefficient; m, coal seam mining height (M) of a goaf; s-area of accumulated water in goaf (m)2) (ii) a α -average dip angle (°) of coal seam.
The total accumulated water amount of the goaf calculated by the formula is 179159m3The 1117 working face design adopts a method of reducing the water head pressure in sections to drain the accumulated water in the goaf, the related data of gradual water drainage is shown in a table 3, and the water drainage range is shown in a table 4.
TABLE 3 LOOSE-REDUCTION OF WATER LEVEL RELATED DATA SUMMARY TABLE
As shown in fig. 4, the sectional drainage position diagram
According to actual measurement, the water supply amount of the 1117 working face top plate aquifer to the goaf is 90m3H, in order to ensure that the drainage drill holes effectively discharge the accumulated water in the goaf and reduce the water level elevation, the drainage water amount of the drill holes is not less than 150m3H is used as the reference value. The water volume of the first section drainage goaf is about 49400m3The time for draining water is about 34 days. The water quantity of the second section drainage goaf accumulated water is 2450 m3The time for draining water is about 17 days. After two-stage water drainage, the residual water in the 1117 working face goaf is about 105100m3(residual accumulated water cannot be drained according to the elevations of the two working surfaces), and the pressure of the accumulated water on the 1119 working surface is reduced to 0.035MPa by the pressure of the accumulated water on the 1117 working surface.
6.1119 additional drainage device for return air crossheading
Under the condition that the original drainage system of the 1119 return air gateway is not changed, 3 BQS200-50-37 type submersible pumps are additionally arranged in a No. 1 drill site water sump and are used for draining water. And (4) laying a 6-inch drainage pipeline to the rail extension roadway again at the No. 1 drill site position.
In conclusion, the facility for eliminating the water accumulation threat of the adjacent goaf on the working face and the implementation scheme have the following advantages: according to the scheme, a plurality of drilling machine chambers are arranged at the coal wall part of one side, close to the adjacent goaf, of a transportation crossheading or a return air crossheading of a working face according to the height trend in a roadway; drilling a plurality of drill holes in each drilling machine chamber towards the direction of the coal seam of the adjacent goaf by using a drilling machine, wherein included angles exist among the plurality of drill holes in the same drilling machine chamber, and the included angle between each drill hole and the coal wall on one side of the adjacent goaf is smaller than 90 degrees; and drilling an inner section close to one side of the drilling machine chamber in each drilling hole, inserting a sleeve into the inner section, pouring cement slurry into a gap between the sleeve and the inner section of the drilling hole for fixing the pipe, and drilling an outer section far away from one side of the drilling machine chamber, wherein the outer section extends into the coal seam of the adjacent goaf. And the end of the sleeve is additionally provided with a connection control device and a water storage bin for storing water is arranged at each drilling machine chamber. This scheme is through the aforesaid elimination setting and embodiment, can effectually dredge the adjacent collecting space area ponding of working face and put, thoroughly eliminates collecting space area ponding threat, guarantees the safety in production of each working face simultaneously.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The facility for eliminating the accumulated water threat of the adjacent goaf of the working face is characterized by comprising a plurality of drilling machine chambers, wherein the drilling machine chambers are arranged at the coal wall part of one side, close to the adjacent goaf, of a transportation crossheading or a return air crossheading of the working face, the drilling machine chambers are sequentially arranged at intervals from high to low along the transportation crossheading or the return air crossheading of the working face according to the fluctuation condition of a roadway bottom plate, a plurality of drill holes are arranged in each drilling machine chamber, and the drill holes extend from the drilling machine chambers into the coal bed of the adjacent goaf;
wherein overlook downwards from the tunnel top, every the rig chamber the contained angle has between a plurality of drilling, just a plurality of drilling with all have an ascending contained angle between the tunnel bottom plate.
2. The work-surface-adjacent goaf water spot threat elimination facility of claim 1, wherein said number of boreholes per said drilling rig chamber is the same.
3. The work-surface-adjacent goaf water spot threat elimination facility of claim 1, wherein said number of boreholes varies for each of said rig chambers.
4. The apparatus for eliminating a goaf water logging threat adjacent a work surface of claim 1, wherein the included angle between said plurality of boreholes of each said drilling rig chamber is equal.
5. The apparatus for eliminating the risk of water accumulation in a gob adjacent a work surface of claim 1 wherein the angles between said plurality of boreholes in each of said drilling rig chambers are unequal.
6. The facility for eliminating the face-adjacent goaf water accumulation threat of claim 1, wherein the diameter of the inner section of each said bore adjacent the side of said drilling rig chamber is greater than the diameter of the outer section adjacent the side of the adjacent goaf.
7. The apparatus for eliminating the water accumulation threat adjacent a goaf in a work surface of claim 6, further comprising:
a sleeve embedded within the inner section of the bore;
a perforated pipe embedded within the outer section of the bore; and
a cement slurry grouted between the casing and the inner section of the borehole.
8. The apparatus for eliminating the water accumulation threat adjacent a goaf in a work surface of claim 6, further comprising:
one end of the tee joint is hermetically connected with the sleeve;
the gate valve is connected with the other end of the tee joint; and
and the pressure gauge is arranged at the third end of the tee joint.
9. The facility for eliminating the risk of standing water in a gob adjacent a work surface as in claim 1 further comprising a plurality of sumps, one sump being associated with each of said rig chambers.
10. An embodiment of a facility for eliminating water accumulation threats in a goaf adjacent to a working surface, comprising:
a plurality of drilling machine chambers are arranged on the coal wall of one side, close to the adjacent goaf, of the transportation crossheading or the return air crossheading of one working face;
drilling a plurality of drill holes in each drilling machine chamber towards the direction of the coal seam of the adjacent goaf by using a drilling machine, wherein included angles exist among the plurality of drill holes in the same drilling machine chamber, and the included angle between each drill hole and the coal wall on one side of the adjacent goaf is smaller than 90 degrees;
drilling an inner section close to one side of the drilling machine chamber by adopting a drill bit with a first diameter in each drilling hole, then inserting a sleeve into the inner section, and pouring cement slurry into a gap between the sleeve and the inner section of the drilling hole for fixing the pipe;
when the cement slurry is poured for 24 hours, drilling an outer section far away from one side of the drilling machine chamber by using a drill bit with a second diameter, wherein the outer section extends into the coal seam of the adjacent goaf, and the second diameter is smaller than the first diameter;
then, carrying out a pressure test step of 1Mpa for 30 minutes on each drilled hole, wherein the periphery of the hole is qualified without water leakage;
installing a flange, a tee joint, a gate valve and a pressure gauge at the end part of the sleeve of each drill hole; and
and each drilling machine chamber is provided with a water sump, and the specifications of the water sumps at the drilling machine chambers are different.
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