CN111927543A - Water preventing and controlling equipment for coal mine geological engineering - Google Patents
Water preventing and controlling equipment for coal mine geological engineering Download PDFInfo
- Publication number
- CN111927543A CN111927543A CN202010886613.5A CN202010886613A CN111927543A CN 111927543 A CN111927543 A CN 111927543A CN 202010886613 A CN202010886613 A CN 202010886613A CN 111927543 A CN111927543 A CN 111927543A
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- ring
- pipe
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 298
- 239000003245 coal Substances 0.000 title claims abstract description 42
- 230000002265 prevention Effects 0.000 claims abstract description 18
- 238000013016 damping Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
-
- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a water prevention and control device for coal mine geological engineering, which belongs to the technical field of water prevention and control and comprises a frame body, a water treatment collecting cylinder arranged in the frame body, a first water baffle and a second water baffle which are sleeved on the water treatment collecting cylinder from top to bottom, a water pump and a water delivery pipe which is movably arranged on the side wall of the frame body, wherein the upper part of the water treatment collecting cylinder is movably connected with the water pump through a water leakage prevention interface, the water delivery pipe is movably arranged on the side wall of the frame body, damping grooves are respectively arranged in the first water baffle and the second water baffle, and a plurality of damping columns which are uniformly. According to the invention, the water pipe is added, so that water flow seeped out under a coal mine can be guided and collected into the water control collecting barrel to be pumped out through the water pump, the water flow under the coal mine can be effectively controlled, and water damage can be prevented.
Description
Technical Field
The invention relates to water prevention and control equipment, in particular to water prevention and control equipment for coal mine geological engineering, and belongs to the technical field of water prevention and control.
Background
The water damage of the coal mine causes one of five disasters with parallel gas, coal dust, a roof and a fire disaster, the severity degree of the water damage is only second to that of the gas rank, and the water damage of the coal mine brings great difficulty to the water damage prevention and treatment work of the mine due to unclear geological data, more and more serious coal mine goafs, ancient goafs and Ordovician ash water along with the continuous change of the mining depth and the mining conditions, particularly after the water damage is combined and recombined.
In the process of using the water control equipment in coal mine geology, due to the existence of other inducing factors such as underground water erosion, vibration generated in coal mining and the like, the plugging effect is poor, so that the water control equipment cannot achieve the expected water control effect.
Disclosure of Invention
The invention mainly aims to solve the defects of the prior art and provide the water control equipment for the coal mine geological engineering.
The purpose of the invention can be achieved by adopting the following technical scheme:
the utility model provides a colliery geological engineering prevention and cure water equipment, includes the support body, installs the inside collection section of thick bamboo of treating water of support body, from top to bottom the cover establish first breakwater and second breakwater on the collection section of thick bamboo of treating water the top of collection section of thick bamboo of treating water has water pump and swing joint through leak protection water interface swing joint to be in raceway on the support body lateral wall, first breakwater with the damping groove has all been seted up to the inside of second breakwater, the inside fixed mounting in damping groove has a plurality of evenly distributed's shock attenuation post, the both ends fixed mounting of first breakwater has the connecting rod, two be equipped with a plurality of evenly distributed's positioner between the connecting rod.
Preferably, the positioning device comprises a positioning tube and a positioning ring sleeved on the positioning tube, the positioning ring is provided with a plurality of positioning holes, and the other end of the positioning tube is conical.
Preferably, one end of the water pumping pipe close to the water pump is connected with the water leakage preventing interface, and the water pump is in threaded connection with the water leakage preventing interface.
Preferably, the two connecting rods are symmetrically distributed by taking the first water baffle as a symmetric center, and the other ends of the connecting rods are provided with mounting holes.
Preferably, the inside fixed mounting who manages water the surge drum has the second to try the water circle, the cover is equipped with fixed mounting on the second tries the water circle the first water circle of managing water the surge drum inner wall, first water circle of trying with the second is the hourglass hopper-shaped water circle of trying.
Preferably, first water examination circle with second water examination circle all includes first retainer plate and installs the second retainer plate of bracing piece fixed connection is passed through to first retainer plate top, first retainer plate with all install the water level detection sensor who is used for detecting the water level on the second retainer plate.
Preferably, the raceway includes the body and installs the mount pad of body one end, the other end fixed mounting of mount pad has sealed the pad, the infiltration hole has been seted up to the bottom of body, one side fixed mounting in infiltration hole has the step form and is used for the manger plate step of manger plate.
Preferably, the bottom of the water treatment collecting cylinder is provided with a water pipe mounting hole in threaded connection with the water pipe.
Preferably, the first water baffle and the second water baffle are both circular water baffles, and the outer diameter of the second water baffle is smaller than that of the first water baffle.
Preferably, the other end of the water pump is fixedly connected with a water delivery hose.
The invention has the beneficial technical effects that: according to the water control equipment for the coal mine geological engineering, the water delivery pipe is added, so that water flow seeping out of the coal mine can be guided and collected into the water control collecting barrel to be pumped out through the water pump, the water flow under the coal mine can be effectively controlled, and water damage is prevented; the first water testing ring and the second water testing ring are added in the water control collecting cylinder, so that the height of the water level can be effectively detected, when the water level reaches the position close to a water level detection sensor on the first water testing ring, water is pumped out through the water pump, the water level is strictly monitored, and the occurrence of water damage can be effectively reduced; a plurality of water retaining steps are arranged inside the water conveying pipe, and can block water flow, so that the time for the water flow to enter the water treatment collecting barrel can be reduced by blocking the water flow layer by layer; the shock absorption columns are arranged inside the first water baffle and the second water baffle, so that the influence of external shock on the frame body can be effectively buffered, the looseness is reduced, and the water control effect of the frame body is guaranteed.
Drawings
FIG. 1 is a schematic overall structure diagram of a preferred embodiment of the water control device for coal mine geological engineering according to the invention;
FIG. 2 is a schematic structural diagram of a first water baffle and a second water baffle of a preferred embodiment of the coal mine geological engineering water control device according to the invention;
FIG. 3 is a schematic diagram of the internal structure of a water control collecting cylinder of a preferred embodiment of the water control device for coal mine geological engineering according to the invention;
FIG. 4 is a top plan view of the overall construction of a preferred embodiment of the coal mine geological engineering water control apparatus according to the present invention;
FIG. 5 is a schematic structural diagram of a water conveying pipe of a preferred embodiment of the water prevention and control device for coal mine geological engineering according to the invention;
FIG. 6 is a schematic diagram of a first water baffle structure of a preferred embodiment of the coal mine geological engineering water control equipment according to the invention;
FIG. 7 is an enlarged view of part A of a first water baffle structure of a preferred embodiment of the coal mine geological engineering water control equipment according to the invention;
fig. 8 is an enlarged view of a portion B of a first water baffle structure of a preferred embodiment of the coal mine geological engineering water control equipment according to the invention.
In the figure: 1-a frame body, 2-a water control collecting barrel, 3-a first water baffle, 4-a connecting rod, 5-a second water baffle, 6-a water conveying pipe, 7-a positioning device, 8-a water pumping pipe, 9-a water leakage prevention interface, 10-a water pump, 11-a water conveying hose, 12-a mounting hole, 13-a positioning pipe, 14-a positioning ring, 15-a positioning hole, 16-a damping groove, 17-a damping column, 18-a water seepage hole, 19-a water baffle step, 20-a mounting seat, 21-a pipe body, 22-a sealing gasket, 23-a water conveying pipe mounting hole, 24-a first water testing ring, 25-a second water testing ring, 26-a first fixing ring, 27-a water level detection sensor and 28-a second fixing ring.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1-8, the coal mine geological engineering water control equipment that this embodiment provided, comprising a frame body 1, install the collecting cylinder 2 of managing water in the inside of frame body 1, from top to bottom the cover establish first breakwater 3 and second breakwater 5 on the collecting cylinder 2 of managing water, the top of the collecting cylinder 2 of managing water has water pump 10 and the raceway 6 of swing joint on the lateral wall of frame body 1 through leak protection water interface 9 swing joint, damping groove 16 has all been seted up to the inside of first breakwater 3 and second breakwater 5, the inside fixed mounting of damping groove 16 has a plurality of evenly distributed's shock absorber columns 17, the both ends fixed mounting of first breakwater 3 has connecting rod 4, be equipped with a plurality of evenly distributed's positioner 7 between two connecting rod 4. The water delivery pipe 6 is added, so that water flow seeped out under a coal mine can be guided and collected into the water control collecting barrel 2 to be pumped out through the water pump 10, the water flow under the coal mine can be effectively controlled, and water damage is prevented; the first water testing ring 24 and the second water testing ring 25 are added in the water control collecting cylinder 2, so that the height of the water level can be effectively detected, when the water level reaches the position close to the water level detection sensor 27 on the first water testing ring 24, water is pumped out through the water pump 10, the water level is strictly monitored, and the occurrence of water damage can be effectively reduced; a plurality of water retaining steps 19 are arranged inside the water delivery pipe 6, the water retaining steps 19 can block water flow, and the time for the water flow to enter the water treatment collecting barrel 2 can be reduced by blocking the water flow layer by layer; be equipped with shock absorber column 17 in the inside of first breakwater 3 and second breakwater 5, the outside vibrations that can effectual buffering are to the influence of support body 1, reduce not hard up, guarantee the effect of managing water of support body 1.
In this embodiment, as shown in fig. 1 and 6, the positioning device 7 includes a positioning tube 13 and a positioning ring 14 sleeved on the positioning tube 13, the positioning ring 14 is provided with a plurality of positioning holes 15, and the other end of the positioning tube 13 is conical. One end of the water pumping pipe 8 close to the water pump 10 is connected with a water leakage prevention interface 9, and the water pump 10 is in threaded connection with the water leakage prevention interface 9. The two connecting rods 4 are symmetrically distributed by taking the first water baffle 3 as a symmetric center, and the other ends of the connecting rods 4 are provided with mounting holes 12. The inside fixed mounting of the collecting cylinder 2 of treating water has the second to try the water circle 25, and the cover is equipped with the first water ring 24 of trying of fixed mounting at the 2 inner walls of collecting cylinder of treating water on the second water ring 25, and first water ring 24 of trying and second water ring 25 are hourglass hopper-shaped water ring of trying. First water ring 24 and second water ring 25 all include first retainer plate 26 and install the second retainer plate 28 through bracing piece fixed connection above first retainer plate 26, all install the water level detection sensor 27 that is used for detecting the water level on first retainer plate 26 and the second retainer plate 28. Be equipped with positioner 7 and establish into conical can be convenient for positioner 7 to insert the underground with positioner 7's one end and fix a position support body 1, be equipped with connecting rod 4 simultaneously and be convenient for the installation and realize fixing a position and positioner 7 and mutually support, the dual location prevents to take place the removal. The arrangement of the first water testing ring 24 and the second water testing ring 25 facilitates layer-by-layer monitoring of water level, prevents water from entering a coal mine to cause flood, and simultaneously, when the frame body 1 is installed, all parts below the first water baffle 3 are installed underground.
In this embodiment, as shown in fig. 1 and 5, the water pipe 6 includes a pipe body 21 and an installation seat 20 installed at one end of the pipe body 21, a sealing gasket 22 is fixedly installed at the other end of the installation seat 20, a water seepage hole 18 is opened at the bottom of the pipe body 21, and a step-shaped water retaining step 19 for retaining water is fixedly installed at one side of the water seepage hole 18. The bottom of the water treatment collecting cylinder 2 is provided with a water pipe mounting hole 23 which is in threaded connection with the water pipe 6. The first water baffle 3 and the second water baffle 5 are both circular water baffles, and the outer diameter of the second water baffle 5 is smaller than that of the first water baffle 3. The other end of the water pump 10 is fixedly connected with a water delivery hose 11. The water retaining step 19 is arranged, so that water flow can be conveniently blocked layer by layer to enter the water treatment collecting barrel 2, the water retaining step 19 is gradually lifted from outside to inside, the effect of blocking water flow entering is better, the water flow entering speed is reduced, and the water flow extracting times of the water pump 10 are reduced. Raceway 6 and the collecting vessel 2 of managing water pass through mount pad 20 threaded connection to insert sealed pad 22 in the collecting vessel 2 of managing water, make it seal up raceway mounting hole 23, prevent that rivers from oozing, the whole corrosion-resistant paint that coats of outside of support body 1 simultaneously prevents that long-time use back top layer from being corroded.
In this embodiment, as shown in fig. 1 to 8, the working process of the coal mine geological engineering water control equipment provided by this embodiment is as follows:
step 1: the frame body 1 is installed in a coal mine project by fixedly installing the first water baffle 3 and the positioning device 7 in the coal mine geology;
step 2: when underground water seeps out, water flow enters the water conveying pipe 6 along the water seepage holes 18, and when the water flow is gathered more, the water flow crosses the water retaining steps 19 layer by layer and enters the water treatment collecting barrel 2;
and step 3: after water flow enters the water treatment collecting cylinder 2, the water flow is detected by the water level detection sensors 27 on the first water testing ring 24 and the second water testing ring 25, when the water level reaches the position of the second fixing ring 28 on the first water testing ring 24, the water level detection sensor 27 on the second fixing ring 28 transmits a detection result to the external controller, the water pump 10 is started to pump water, and water disasters caused by water flow entering a coal mine are prevented.
To sum up, in this embodiment, according to the colliery geological engineering prevention and cure water equipment of this embodiment, the colliery geological engineering prevention and cure water equipment that this embodiment provided is equipped with positioner 7 and establishes positioner 7's one end into the taper shape can be convenient for positioner 7 to insert the underground and fix a position support body 1, is equipped with connecting rod 4 simultaneously and is convenient for the installation and realize fixing a position and positioner 7 and mutually support, and double localization prevents to take place the removal. The arrangement of the first water testing ring 24 and the second water testing ring 25 facilitates layer-by-layer monitoring of water level, prevents water from entering a coal mine to cause flood, and simultaneously, when the frame body 1 is installed, all parts below the first water baffle 3 are installed underground. The water retaining step 19 is arranged, so that water flow can be conveniently blocked layer by layer to enter the water treatment collecting barrel 2, the water retaining step 19 is gradually lifted from outside to inside, the effect of blocking water flow entering is better, the water flow entering speed is reduced, and the water flow extracting times of the water pump 10 are reduced. Raceway 6 and the collecting vessel 2 of managing water pass through mount pad 20 threaded connection to insert sealed pad 22 in the collecting vessel 2 of managing water, make it seal up raceway mounting hole 23, prevent that rivers from oozing, the whole corrosion-resistant paint that coats of outside of support body 1 simultaneously prevents that long-time use back top layer from being corroded.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.
Claims (10)
1. The water prevention and control equipment for the coal mine geological engineering is characterized by comprising a frame body (1), a water treatment collecting cylinder (2) arranged in the frame body (1), a first water baffle (3) and a second water baffle (5) which are sleeved on the water treatment collecting cylinder (2) from top to bottom, a water pump (10) movably connected above the water treatment collecting cylinder (2) through a water leakage prevention connector (9) and a water conveying pipe (6) movably arranged on the side wall of the frame body (1), the first water baffle (3) and the second water baffle (5) are both internally provided with damping grooves (16), a plurality of shock absorption columns (17) which are uniformly distributed are fixedly arranged in the shock absorption groove (16), the two ends of the first water baffle (3) are fixedly provided with connecting rods (4), and a plurality of positioning devices (7) which are uniformly distributed are arranged between the two connecting rods (4).
2. The coal mine geological engineering water control equipment according to claim 1, characterized in that the positioning device (7) comprises a positioning pipe (13) and a positioning ring (14) sleeved on the positioning pipe (13), the positioning ring (14) is provided with a plurality of positioning holes (15), and the other end of the positioning pipe (13) is conical.
3. The coal mine geological engineering water control equipment according to claim 1, characterized in that one end of the water pumping pipe (8) close to the water pump (10) is connected with the water leakage prevention connector (9), and the water pump (10) is in threaded connection with the water leakage prevention connector (9).
4. The coal mine geological engineering water control equipment according to claim 1, characterized in that the two connecting rods (4) are symmetrically distributed with the first water baffle (3) as a symmetric center, and the other ends of the connecting rods (4) are provided with mounting holes (12).
5. The coal mine geological engineering water control equipment according to claim 1, characterized in that a second water testing ring (25) is fixedly installed inside the water control collecting cylinder (2), a first water testing ring (24) fixedly installed on the inner wall of the water control collecting cylinder (2) is sleeved on the second water testing ring (25), and the first water testing ring (24) and the second water testing ring (25) are funnel-shaped water testing rings.
6. The coal mine geological engineering water control equipment as claimed in claim 5, characterized in that the first water testing ring (24) and the second water testing ring (25) comprise a first fixing ring (26) and a second fixing ring (28) which is fixedly connected with the first fixing ring (26) through a supporting rod, and water level detection sensors (27) for detecting water levels are mounted on the first fixing ring (26) and the second fixing ring (28).
7. The coal mine geological engineering water control equipment according to claim 1, characterized in that the water pipe (6) comprises a pipe body (21) and an installation seat (20) installed at one end of the pipe body (21), a sealing gasket (22) is fixedly installed at the other end of the installation seat (20), a water seepage hole (18) is formed in the bottom of the pipe body (21), and a step-shaped water retaining step (19) for retaining water is fixedly installed at one side of the water seepage hole (18).
8. The coal mine geological engineering water control equipment according to claim 1, characterized in that the bottom of the water control collecting barrel (2) is provided with a water pipe mounting hole (23) in threaded connection with the water pipe (6).
9. The coal mine geological engineering water control equipment according to claim 1, characterized in that the first water baffle (3) and the second water baffle (5) are both circular ring-shaped water baffles, and the outer diameter of the second water baffle (5) is smaller than that of the first water baffle (3).
10. The coal mine geological engineering water control equipment according to claim 1, characterized in that the other end of the water pump (10) is fixedly connected with a water delivery hose (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010886613.5A CN111927543B (en) | 2020-08-28 | 2020-08-28 | Water preventing and controlling equipment for coal mine geological engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010886613.5A CN111927543B (en) | 2020-08-28 | 2020-08-28 | Water preventing and controlling equipment for coal mine geological engineering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111927543A true CN111927543A (en) | 2020-11-13 |
| CN111927543B CN111927543B (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010886613.5A Active CN111927543B (en) | 2020-08-28 | 2020-08-28 | Water preventing and controlling equipment for coal mine geological engineering |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU911025A1 (en) * | 1980-04-30 | 1982-03-07 | Научно-производственное объединение по созданию и выпуску средств автоматизации горных машин "Автоматгормаш" | Hydraulic mechanism for moving coal cutter-loader |
| CN205822119U (en) * | 2016-07-08 | 2016-12-21 | 重庆水利电力职业技术学院 | A kind of construction of hydro project automatic drain system |
| CN207177966U (en) * | 2017-09-28 | 2018-04-03 | 单超 | One kind is used for the self-draining electromechanical equipment of underground coal mine |
| CN209818106U (en) * | 2019-04-12 | 2019-12-20 | 郑宏旭 | Drainage device in coal mine goaf |
| CN211006722U (en) * | 2019-10-11 | 2020-07-14 | 朱超杰 | Well point drainage structure is used in civil engineering construction |
| CN211202051U (en) * | 2019-10-31 | 2020-08-07 | 任文华 | Drainage structure in coal mine goaf |
-
2020
- 2020-08-28 CN CN202010886613.5A patent/CN111927543B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU911025A1 (en) * | 1980-04-30 | 1982-03-07 | Научно-производственное объединение по созданию и выпуску средств автоматизации горных машин "Автоматгормаш" | Hydraulic mechanism for moving coal cutter-loader |
| CN205822119U (en) * | 2016-07-08 | 2016-12-21 | 重庆水利电力职业技术学院 | A kind of construction of hydro project automatic drain system |
| CN207177966U (en) * | 2017-09-28 | 2018-04-03 | 单超 | One kind is used for the self-draining electromechanical equipment of underground coal mine |
| CN209818106U (en) * | 2019-04-12 | 2019-12-20 | 郑宏旭 | Drainage device in coal mine goaf |
| CN211006722U (en) * | 2019-10-11 | 2020-07-14 | 朱超杰 | Well point drainage structure is used in civil engineering construction |
| CN211202051U (en) * | 2019-10-31 | 2020-08-07 | 任文华 | Drainage structure in coal mine goaf |
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| CN111927543B (en) | 2022-09-27 |
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Effective date of registration: 20220127 Address after: 234000 Anhui city in Suzhou province near the River Road No. 215 Applicant after: China Coal Third Construction (Group) Co.,Ltd. Address before: 234000 56 Daodong street, Yongqiao District, Suzhou City, Anhui Province Applicant before: China Coal Third Construction Group Anhui Geological Survey Engineering Co.,Ltd. |
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