CN217681857U - Water pressing device for monitoring deformation of coal bed roof rock stratum - Google Patents
Water pressing device for monitoring deformation of coal bed roof rock stratum Download PDFInfo
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- CN217681857U CN217681857U CN202220528002.8U CN202220528002U CN217681857U CN 217681857 U CN217681857 U CN 217681857U CN 202220528002 U CN202220528002 U CN 202220528002U CN 217681857 U CN217681857 U CN 217681857U
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Abstract
The utility model discloses a water pressing device for monitoring deformation of a coal seam roof rock stratum, which comprises a drill rod arranged in a drill hole, wherein a flange plate is arranged at the top end of the drill rod, a pressure gauge is arranged on the flange plate, a water inlet pipe is arranged on the side wall of the drill rod in an inserting way, and a water injection pipe is arranged in the drill rod; the one end of inlet tube and the upper end intercommunication of water injection pipe, the other end intercommunication of inlet tube is provided with the water pump, the middle part of inlet tube is provided with the water tank through the wet return intercommunication, be connected through the drinking-water pipe between water pump and the water tank, be provided with the return water valve on the wet return, the one end that the inlet tube is close to the water injection pipe is provided with the flowmeter, relate to coal mining technical field, through the device, can apply fixed hydraulic pressure to weak stratum under the coal seam roof overlying strata key layer, solve weak stratum abscission layer cavity monitoring problem under the key layer in the coal seam roof overlying strata, thereby realize accurate judgement best slip casting opportunity (abscission deformation is the biggest), the technological effect of the best opportunity beginning slip casting.
Description
Technical Field
The utility model belongs to the technical field of coal mining, specifically be a water pressing device for monitoring of coal seam roof rock stratum deformation.
Background
According to the incomplete statistical data of important coal mines in China, the coal pressing amount of the 'three-lower' (under buildings, railways and water bodies) in China is about 137.9 hundred million tons at present, wherein the coal pressing amount under the buildings is 87.6 hundred million tons, and 60 percent of the coal pressing amount under the buildings is the coal pressing amount under villages. The coal pressing quantity of partial mining area buildings is very large, and the development of mining areas is seriously restricted.
The traditional mining technology can cause surface subsidence and building damage, not only causes unbalanced mine excavation and replacement, but also brings huge economic cost, environmental problems and ground mine contradiction, leads to incapability of developing and utilizing coal, reduces the resource extraction rate, shortens the service life of a mining area, and hinders regional economic development. With the development of economy and society, the traditional relocation mining cost is higher and higher, and the implementation difficulty is higher and higher. Although strip mining can effectively control mining subsidence, the mining rate is low (less than 30-50%), the working face is short, the tunneling rate of a roadway is high, and the coal mining efficiency is low. The implementation of pack mining can improve the coal extraction rate, but still faces the problems of low efficiency, higher cost, etc. (xu jia lin et al, 2004, 2011, 2019; xuan ocean et al, 2012). Therefore, the research and development of the efficient and low-cost building coal-pressing filling mining technology is a great demand for practicing the green development concept and maintaining the sustainability of the mining industry.
In the overlying strata of a stope, the strata which plays a decisive role in rock mass activity are key layers. When there are several hard strata in overburden in a stope, the strata that determine the overall activity of the rock are called the primary key strata and the strata that determine the local activity of the rock are called the secondary key strata (chien et al, 1996).
The principle of this method is that the separated stratum area is filled by high-pressure grouting to compress the broken rock body in the goaf and form a compacted area, and the isolated coal pillar between compacted area and working face jointly controls the deformation and breaking of key stratum of overlying strata, thus reducing the subsidence of ground surface (Hao Teng, 2017).
With the continuous propulsion of a coal face, the overlying strata are broken from bottom to top in groups under the control action of the structure of the key layer of the overlying strata, and the unbroken key layer blocks the downward transmission of the upper load, so that the lower coal strata generate unloading expansion (including stratum broken expansion and elastic expansion). Along with the development of the breaking of the key layer from bottom to top, the unloading height of the overlying strata is continuously increased, and the total thickness of the rock stratum which generates unloading expansion is continuously increased; meanwhile, the lower unloading coal rock is continuously accumulated under the compaction action of the load of the upper breaking key layer, so that the unloading expansion total amount of the overlying strata is continuously changed. Obviously, the cumulative amount of unloading expansion is not negligible for overburden in a typical coal-based formation (scholar et al, 2020).
The key of the overlying strata separation layer grouting filling technology is as follows: the method comprises the steps of selection of a key layer, measurement of a overlying strata separation layer cavity, selection of grouting opportunity, grouting materials, a grouting process, grouting pressure, grouting equipment, grouting effect monitoring and the like.
The measurement work of the overburden separation cavity is a crucial work, and the measurement work determines the grouting time of the overburden separation. The best grouting time is generally considered when the overlying strata separation cavity is the largest.
The technical method for measuring the overburden separation layer cavity comprises the following steps: direct viewing-downhole television; test methods-water injection pressure test method (Weiwei, 2005; dujinlong et al, 2020), optical fiber monitoring method (Wangjiacheng et al, 2020; chenggang et al, 2017; ludwig et al, 2015); geophysical exploration method-borehole acoustic method (Liu Wang, 1985), microseismic monitoring method (Sun Jian et al, 2011), CT electrical method (Zhang Ping Song et al, 2006); wutao et al, 2014), electromagnetic methods (Kuihong, 2014), etc.; ground deformation monitoring-synthetic aperture interferometric radar (INSAR), global Positioning System (GPS), leveling, bedrock and layered landmarks, etc. (military, 2000; dung qinghai, etc. 2007; zhao shin, etc. 2009; zhuyei, etc. 2010).
The underground television is the most direct method for observing the size of a cavity of a overburden bed separation at present, but the maximum settlement of the most separation layer cannot be accurately determined, and the grouting time cannot be accurately mastered.
The optical fiber monitoring method can monitor the deformation of the rock above the coal bed, but the optical fiber is not broken through a monitoring hole due to small elongation coefficient and general tensile strength of the optical fiber, so that the maximum settlement of the separated layer cannot be determined; meanwhile, the optical fiber monitoring holes need to be sealed in all holes, the cost is high, grouting operation cannot be performed through the monitoring holes, and resource waste is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a water press device for monitoring of coal seam roof rock stratum warp to solve the problem that proposes in the above-mentioned background art.
The utility model adopts the technical scheme as follows:
a water pressing device for monitoring deformation of a coal seam roof rock stratum comprises a drill rod arranged in a drill hole, wherein a flange plate is arranged at the top end of the drill rod, a pressure gauge is arranged on the flange plate, a water inlet pipe is inserted and arranged on the side wall of the drill rod, and a water injection pipe is arranged in the drill rod;
the one end of inlet tube with the upper end intercommunication of water injection pipe, the other end intercommunication of inlet tube is provided with the water pump, the middle part of inlet tube is provided with the water tank through the wet return intercommunication, be connected through the drinking-water pipe between water pump and the water tank, be provided with the return water valve on the wet return, the inlet tube is close to the one end of water injection pipe is provided with the flowmeter.
Preferably, the water pump is an S-shaped single-stage double-suction centrifugal pump, the flow rate of the S-shaped single-stage double-suction centrifugal pump is 160-18000 cubic meters per hour, the lift of the S-shaped single-stage double-suction centrifugal pump is 20-100 meters, and the diameter of a water inlet of the S-shaped single-stage double-suction centrifugal pump is 150-300 millimeters.
Preferably, the water tank is a steel water tank, and the volume of the water tank is 500-1000 cubic meters.
Preferably, the pumping pipe, the water inlet pipe and the water return pipe are all seamless steel pipes, and the diameters of the pumping pipe, the water inlet pipe and the water return pipe are all 150-300 mm.
Preferably, the flow meter adopts a high-precision electronic flow meter, the precision of the high-precision electronic flow meter is 0.1L/s, and the high-precision electronic flow meter is used for recording the accumulated flow.
Preferably, the pressure gauge adopts a high-precision electronic pressure gauge, and the precision of the pressure gauge is 0.1Mpa.
Preferably, the flange plate is made of steel and used for sealing the drill rod, and a hollow pipe is arranged at the top of the flange plate and used for connecting a pressure gauge.
Preferably, the water injection pipe is a seamless steel pipe with the diameter of 100 mm.
Preferably, the drill rod is a seamless steel pipe, the outer diameter of the seamless steel pipe is 168.3 mm, the wall thickness of the seamless steel pipe is 8.13 mm, and the joint of the seamless steel pipe is subjected to leakage prevention treatment.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses in, through the device, can apply fixed hydraulic pressure to weak stratum under the coal seam roof overlying strata key layer, solve soft stratum abscission layer cavity monitoring problem under the key layer in the coal seam roof overlying strata to realize accurate judgement best slip casting opportunity (abscission deformation is the biggest), the technological effect that begins the slip casting at best opportunity.
2. The utility model discloses in, device simple structure, and low cost has saved manpower and materials, the effective control cost, facilitate promotion.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1. a water pump; 2. a water tank; 3. a water pumping pipe; 4. a water inlet pipe; 5. a water inlet valve; 6. a water return pipe; 7. a water return valve; 8. a flow meter; 9. a pressure gauge; 10. a flange plate; 11. a water injection pipe; 12. a drill stem; 13. ground water; 14. drilling; 15. an upper rock formation; 16. a key layer of overburden rock; 17. a lower weak rock formation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1:
the embodiment provides a concrete structure of a water pressing device for monitoring deformation of a coal seam roof rock stratum, and as shown in fig. 1, the water pressing device comprises a drill rod 12 arranged in a drill hole 14, a flange 10 is arranged at the top end of the drill rod 12, a pressure gauge 9 is arranged on the flange 10, a water inlet pipe 4 is arranged on the side wall of the drill rod 12 in an inserting manner, and a water injection pipe 11 is arranged in the drill rod 12;
the one end of inlet tube and the upper end intercommunication of water injection pipe 11, the other end intercommunication of inlet tube 4 is provided with water pump 1, and 6 intercommunications of wet return are passed through at the middle part of inlet tube 4 and are provided with water tank 2, are connected through drinking-water pipe 3 between water pump 1 and the water tank 2, are provided with return water valve 7 on the wet return 6, and the one end that inlet tube 4 is close to water injection pipe 11 is provided with flow meter 8.
Furthermore, the water pump 1 adopts an S-shaped single-stage double-suction centrifugal pump, the flow rate is 160-18000 cubic meters per hour, the lift is 20-100 meters, and the diameter of a water inlet is 150-300 millimeters.
Further, the water tank 2 is a steel water tank, and the volume of the water tank is 500-1000 cubic meters.
Furthermore, the water pumping pipe 3, the water inlet pipe 4 and the water return pipe 6 are all seamless steel pipes, and the diameters of the water pumping pipe, the water inlet pipe and the water return pipe are all 150-300 mm.
Further, the flow meter 8 adopts a high-precision electronic flow meter, the precision of which is 0.1L/s, and the high-precision electronic flow meter is used for recording the accumulated flow.
Furthermore, the pressure gauge 9 is a high-precision electronic pressure gauge with the precision of 0.1Mpa.
Further, the flange plate 10 is made of steel and used for sealing the drill rod, and a hollow pipe is arranged at the top of the flange plate and used for connecting a pressure gauge.
Further, the water injection pipe 11 is a seamless steel pipe with a diameter of 100 mm.
Furthermore, the drill rod 12 is a seamless steel pipe with an outer diameter of 168.3 mm and a wall thickness of 8.13 mm, and the joint is subjected to leakage prevention treatment.
Further, the borehole 14 passes through an upper rock layer 15, a overburden key layer 16 and a lower weak rock layer 17 from top to bottom in sequence.
According to the working principle, referring to fig. 1, when the underground water-level control device is used, water in a water tank 2 is pumped by a water pump 1 and is injected into a drill rod 12 through a water inlet pipe 4 and a water injection pipe 11, a fixed pressure (generally 1 MPa) is applied to a lower soft layer 17 below a key layer 16 (sandstone and the like) of the overlying strata of a coal seam roof, the flow of the water entering a drill hole 14 is controlled through electronic valves such as a water inlet valve and a water return valve, the pressure in the drill hole 14 is ensured to be fixed, and at the moment, the water level fluctuation of underground water 13 in the drill rod 12 is small. The leakage amount and the total leakage rate of the lower weak rock stratum 17 under the coal seam roof overlying rock key layer 16 (sandstone and the like) in different periods of time can be estimated by regularly observing the flow and accumulating the flow to determine the leakage amount and the total leakage amount in different periods of time, and the optimal grouting time (when the separation leakage rate is maximum) can be accurately judged according to the variation trend of the leakage rate and the relation between a mining working face and the leakage rate.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. The utility model provides a hydraulic means for monitoring of coal seam roof rock stratum deformation which characterized in that: the drilling device comprises a drilling rod (12) arranged in a drilling hole (14), wherein a flange plate (10) is arranged at the top end of the drilling rod (12), a pressure gauge (9) is arranged on the flange plate (10), a water inlet pipe (4) is arranged on the side wall of the drilling rod (12) in an inserting mode, and a water injection pipe (11) is arranged in the drilling rod (12);
the one end of inlet tube with the upper end intercommunication of water injection pipe (11), the other end intercommunication of inlet tube (4) is provided with water pump (1), the middle part of inlet tube (4) is provided with water tank (2) through wet return (6) intercommunication, be connected through drinking-water pipe (3) between water pump (1) and water tank (2), be provided with return water valve (7) on wet return (6), inlet tube (4) are close to the one end of water injection pipe (11) is provided with flow meter (8).
2. The hydraulic press apparatus for monitoring deformation of a roof formation of a coal seam as claimed in claim 1, wherein: the water pump (1) adopts an S-shaped single-stage double-suction centrifugal pump, the flow rate is 160-18000 cubic meters per hour, the lift is 20-100 meters, and the diameter of a water inlet is 150-300 millimeters.
3. The hydraulic press apparatus for monitoring deformation of a roof formation of a coal seam as claimed in claim 1, wherein: the water tank (2) is a steel water tank, and the volume of the water tank is 500-1000 cubic meters.
4. The hydraulic press apparatus for monitoring deformation of a roof formation of a coal seam as claimed in claim 1, wherein: the water pumping pipe (3), the water inlet pipe (4) and the water return pipe (6) are all seamless steel pipes, and the diameters of the water pumping pipe, the water inlet pipe and the water return pipe are all 150-300 mm.
5. The hydraulic press apparatus for monitoring deformation of a roof formation of a coal seam as claimed in claim 1, wherein: the flow meter (8) adopts a high-precision electronic flow meter, the precision of the high-precision electronic flow meter is 0.1L/s, and the high-precision electronic flow meter is used for recording the accumulated flow.
6. The hydraulic press apparatus for monitoring deformation of a roof formation of a coal seam as claimed in claim 1, wherein: the pressure gauge (9) adopts a high-precision electronic pressure gauge, and the precision of the pressure gauge is 0.1Mpa.
7. The water pressing device for monitoring deformation of the roof strata of the coal seam as claimed in claim 1, wherein: the flange plate (10) is a steel flange plate and used for sealing the drill rod, and a hollow pipe is arranged at the top of the steel flange plate and used for connecting a pressure gauge.
8. The water pressing device for monitoring deformation of the roof strata of the coal seam as claimed in claim 1, wherein: the water injection pipe (11) is a seamless steel pipe with the diameter of 100 mm.
9. The water pressing device for monitoring deformation of the roof strata of the coal seam as claimed in claim 1, wherein: the drill rod (12) is a seamless steel pipe, the outer diameter of the seamless steel pipe is 168.3 mm, the wall thickness of the seamless steel pipe is 8.13 mm, and the joint of the seamless steel pipe is subjected to leakage prevention treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220528002.8U CN217681857U (en) | 2022-03-07 | 2022-03-07 | Water pressing device for monitoring deformation of coal bed roof rock stratum |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220528002.8U CN217681857U (en) | 2022-03-07 | 2022-03-07 | Water pressing device for monitoring deformation of coal bed roof rock stratum |
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| CN217681857U true CN217681857U (en) | 2022-10-28 |
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| CN202220528002.8U Active CN217681857U (en) | 2022-03-07 | 2022-03-07 | Water pressing device for monitoring deformation of coal bed roof rock stratum |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116147711A (en) * | 2023-04-17 | 2023-05-23 | 山西潞安环保能源开发股份有限公司 | Device and method for testing coal mine overburden stratum fracture space-time evolution law |
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2022
- 2022-03-07 CN CN202220528002.8U patent/CN217681857U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116147711A (en) * | 2023-04-17 | 2023-05-23 | 山西潞安环保能源开发股份有限公司 | Device and method for testing coal mine overburden stratum fracture space-time evolution law |
| CN116147711B (en) * | 2023-04-17 | 2023-07-11 | 山西潞安环保能源开发股份有限公司 | Device and method for testing coal mine overburden stratum fracture space-time evolution law |
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