CN113202540A - Intermittent grouting fire prevention and extinguishing method for high-position extraction drill site of high-gas mine - Google Patents
Intermittent grouting fire prevention and extinguishing method for high-position extraction drill site of high-gas mine Download PDFInfo
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- CN113202540A CN113202540A CN202110633052.2A CN202110633052A CN113202540A CN 113202540 A CN113202540 A CN 113202540A CN 202110633052 A CN202110633052 A CN 202110633052A CN 113202540 A CN113202540 A CN 113202540A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/08—Rock dusting of mines; Depositing other protective substances
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
An intermittent grouting fire prevention and extinguishing method for a high-position extraction drill site of a high-gas mine relates to the technical field of coal spontaneous combustion and gas comprehensive prevention and control. According to the method, a grouting pipe network is laid by utilizing a high-position drill site for gas extraction in a high-gas mine, the viscosity of slurry is monitored in real time through a digital display rotational viscometer in a grouting device, a viscosity signal is transmitted to a control panel, the control panel controls a stirring pump to stir the slurry to realize real-time regulation and control of the viscosity of the slurry, and the problem that the thixotropic slurry blocks a pipeline in the grouting process is solved; by controlling the first and second pairs of grouting branch pipes to perform intermittent alternate grouting inside the goaf, slurry is accumulated from a lower part to a higher part inside the goaf along the direction of the fully mechanized coal mining face, air leakage is cut off in time, spontaneous combustion of coal is inhibited, gas in the goaf is prevented from flowing out along with the wind, upper corner gas is prevented from exceeding the limit, grouting, leakage stoppage, fire prevention and fire extinguishing in the goaf are organically combined with gas control, and safe mining of coal is guaranteed.
Description
Technical Field
The invention belongs to the technical field of coal spontaneous combustion and gas comprehensive control, and particularly relates to an intermittent grouting fire prevention and extinguishing method for a high-position extraction drill site of a high-gas mine.
Background
The goaf is the area in the coal mine where spontaneous combustion of coal is most likely to occur, and the number of times of fire caused by spontaneous combustion of residual coal accounts for more than 60% of the total number of internal fire. In recent years, with the wide application of mechanized fully-mechanized top coal caving technology, a large amount of residual coal remains in a goaf to form a goaf porous medium space formed by a large amount of residual coal, and natural ignition accidents of the residual coal in the goaf are frequent under the influence of air leakage of a working face, so that the amount of coal frozen and mined per year exceeds 2 hundred million tons, the loss of high-quality coal reaches 42 hundred million tons, and the loss of enterprises is nearly 100 hundred million yuan.
Along with the increase of the mining depth of the coal mine, the gas content and the gas pressure of the coal bed are continuously increased, and a large number of shallow low-gas mines are upgraded into high-gas mines and even coal and gas outburst mines. In order to ensure the safe mining of coal, the gas drainage technology is widely popularized and applied in the gas treatment, the gas at the upper corner of the fully mechanized mining face is prevented from exceeding the limit, the air intake of the goaf is inevitably increased, and the oxidation and spontaneous combustion of residual coal in the goaf are promoted. In a high gas mine, once coal is naturally ignited, gas and coal spontaneous combustion disasters are easily interwoven and symbiotic, so that the disaster risk is increased, and the lives of workers are damaged. In order to effectively block air leakage and prevent spontaneous combustion of residual coal in a goaf, normally, a plugging material is injected into the goaf, but most of gel materials for plugging air leakage have thixotropy, and the viscosity of the gel materials is increased due to reduction of shearing force after stirring, so that slurry flows slowly, a pipeline is blocked, and the optimal time for plugging, preventing and extinguishing fire is delayed. Therefore, the problem of coal oxidation spontaneous combustion caused by air leakage in the goaf of the high-gas mine and the problem of intercrossing and symbiosis of gas and coal spontaneous combustion disasters are urgently needed to be solved.
Disclosure of Invention
The invention aims to solve the problem of gas and coal spontaneous combustion disaster interweaving symbiosis caused by coal oxidation and spontaneous combustion due to air leakage of the high-gas mine goaf, and provides a fire preventing and extinguishing method for performing intermittent grouting on the coal mine goaf by using a high-level drilling site under a high-gas coal mine.
An intermittent grouting fire prevention and extinguishing method for a high-gas mine high-position extraction drill site is characterized in that a high-position drill site 22 for extracting gas in a high-gas mine return air lane 20 is used for laying a grouting pipe network, the viscosity of slurry is monitored in real time through a grouting device 24 and is enabled to be not more than 200 mPa.s-400 mPa.s all the time, meanwhile, intermittent alternate grouting is carried out on a first grouting branch pipe and a second grouting branch pipe in two pairs of goafs, the slurry is enabled to be accumulated from a lower position to a higher position in the direction of a fully mechanized mining face in the goafs, sufficient time is provided for gelation, and air leakage is prevented.
The intermittent grouting fire prevention and extinguishing method for the high-position extraction drill site of the high gas mine is characterized in that a grouting pipe network consists of a grouting branch pipe network I4, a grouting branch pipe network II 5, a steel flower pipe 7, an air return tunnel 20, a goaf 21, a high-position drill site 22, a fully mechanized mining working surface 23 and a grouting device 24, wherein the grouting device 24 comprises a main pipeline 1, a grouting branch pipe I2, a grouting branch pipe II 3, an electric three-way regulating valve 6, a quantitative addition pump 8, a pulping pool 9, a stirring pump 10, a digital display rotary viscometer 11, a control panel 12, a pneumatic grouting pump 13, a control valve 14, a pressure gauge 15, a flow meter 16, a pressure equalizer 17 and a pressure regulating valve 19, the main pipeline 1 is arranged in the air return tunnel 20, the pressure gauge 15, the flow meter 16 and the control valve 14 are arranged on the main pipeline 1, the pneumatic grouting pump 13 is connected at the inlet of the main pipeline 1, and the pressure regulating valve 19 is arranged on the pneumatic grouting pump 13, a pneumatic grouting pump 13 is connected with a pulping tank 9, a quantitative addition pump 8 is arranged on the left side of the pulping tank 9, a stirring pump 10 is arranged right above the pulping tank 9, a digital display rotary viscometer 11 and a control panel 12 are arranged on the stirring pump 10, the control panel 12 is connected with the pneumatic grouting pump 13, the digital display rotary viscometer 11, the stirring pump 10 and an electric three-way valve 6, the outlet of a main pipeline 1 is connected with a grouting branch pipe I2 and a grouting branch pipe II 3 through the electric three-way regulating valve 6, the grouting branch pipe I2 is provided with a pressure equalizer I17, the grouting branch pipe I2 is connected with a grouting branch pipe network I4, a second pressure equalizer 18 is arranged on the second grouting branch pipe 3, the second grouting branch pipe 3 is connected with a second grouting branch pipe network 5, the tail ends of the grouting branch pipe network I4 and the grouting branch pipe network II 5 are connected with steel perforated pipes 7, and the grouting branch pipe network I4 and the grouting branch pipe network II 5 are inserted into the goaf 21 through a high-position drill site 22.
The intermittent grouting fire prevention and extinguishing method for the high-position extraction drill site of the high-gas mine is characterized in that a gel material with thixotropy and water are mixed by a quantitative addition pump 8 according to the ratio of 1: 4 or 1: 5 or 1: 6 is put into a slurry preparation pool 9 in proportion, is stirred by a stirring pump 10 to prepare slurry, a digital display rotational viscometer (11) is adopted to measure the viscosity of the slurry in real time and transmit a viscosity signal to a control panel (12), when the viscosity of the slurry is 40-70 mPa.s, a control valve (14) on a main pipeline (1) is opened, an electric three-way valve (6) is adjusted by the control panel (12) to communicate the main pipeline (1) with a first grouting branch pipe (2), a second grouting branch pipe (3) is closed, a pneumatic grouting pump (13) is started to inject the slurry into a goaf (21) through a first grouting branch pipe network (4), the electric three-way valve (6) is adjusted by the control panel (12) to communicate the main pipeline (1) with the second grouting branch pipe (3) after grouting for 20-40 min, the first grouting branch pipe (2) is closed, the pneumatic grouting pump (13) continuously injects the slurry into the goaf (23) through a second grouting branch pipe network (5), the slurry is injected for 20-40 min again, the control panel (12) adjusts the electric three-way valve (6) to communicate the main pipeline (1) with the first grouting branch pipe (2), and closing the second grouting branch pipe 3, continuously injecting the slurry into the goaf 21, and then sequentially and circularly reciprocating until grouting is finished.
The intermittent grouting fire prevention and extinguishing method for the high-position extraction drill site of the high-gas mine is characterized in that the pressures of grouting branch pipes are equal.
The intermittent grouting fire prevention and extinguishing method for the high-position extraction drill site of the high-gas mine is characterized in that grouting branch pipes in a grouting branch pipe network I4 and grouting branch pipes in a grouting branch pipe network II 5 are sequentially arranged in a staggered mode, the length of a steel perforated pipe 7 connected with the grouting branch pipe network I4 and the grouting branch pipe network II 5 is 3-5 m, and the tail ends of the steel perforated pipes 7 are closed, are located on the same horizontal line and are parallel to the direction of a fully mechanized mining face 23.
The intermittent grouting fire prevention and extinguishing method for the high-position extraction drill site of the high-gas mine is characterized in that the main pipeline 1, the grouting branch pipe I2 and the grouting branch pipe II 3 are high-pressure rubber pipes, and the grouting branch pipe network I4 and the grouting branch pipe network II 5 are seamless steel pipes.
The intermittent grouting fire prevention and extinguishing method for the high-position extraction drill site of the high-gas mine is characterized in that the digital display rotational viscometer 11 monitors the viscosity of grouting slurry and transmits a viscosity signal to the control board 12, when the viscosity of the grouting slurry is 200-400 mPa.s, the control board 12 controls the pneumatic grouting pump 13 to be closed, grouting is stopped, the stirring pump 10 is controlled to operate at the rotating speed of 1000-1200 r/min, when the viscosity of the grouting slurry is 40-70 mPa.s, the control board 12 controls the stirring pump 10 to operate at the rotating speed of 60-100 r/min, the pneumatic grouting pump 13 is started, and grouting is started.
Compared with the prior art, the thixotropic slurry grouting pipe blocking problem is solved based on real-time regulation and control of the viscosity of the inorganic thixotropic gel, intermittent alternate grouting is carried out in the goaf by controlling the first grouting branch pipe and the second grouting branch pipe, on one hand, the thixotropic slurry injected into the goaf has enough time to stand to form gel with a stable structure, so that the re-injected slurry can continue to be accumulated upwards on the basis of the existing gel, cracks are effectively blocked, air leakage is cut off, natural ignition of residual coal is prevented, meanwhile, gas in the goaf is prevented from flowing out along with the wind, the gas at the upper corner is prevented from exceeding the limit, the organic combination of blocking, leakage, fire prevention and gas control of the goaf is realized, and the safe mining of coal is ensured; on the other hand, the grouting efficiency of the grouting device is improved within the same construction time.
Drawings
FIG. 1 is a schematic plan view of an intermittent grouting pipe network of a high-position extraction drill site of a high-gas mine;
FIG. 2 is a schematic plan view of the grouting apparatus of the present invention;
in the figure: 1-a main pipeline, 2-a grouting branch pipe I, 3-a grouting branch pipe II, 4-a grouting branch pipe network I, 5-a grouting branch pipe network II, 6-an electric three-way valve, 7-a rigid pipe, 8-a quantitative addition pump, 9-a pulping pool, 10-a stirring pump, 11-a digital display rotational viscometer, 12-a control panel, 13-a pneumatic grouting pump, 14-a control valve, 15-a pressure gauge, 16-a flowmeter, 17-a first pressure equalizer, 18-a second pressure equalizer, 19-a pressure regulating valve, 20-an air return way, 21-a goaf, 22-a high-position drilling site, 23-a comprehensive mining working surface and 24-a grouting device.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
example 1
The method comprises the following steps:
firstly, the invention utilizes a high-position drill site 22 for extracting gas in a return airway 20 of a high gas mine to lay a grouting pipe network, wherein the grouting pipe network consists of a grouting branch pipe network I4, a grouting branch pipe network II 5, a steel flower pipe 7, a return airway 20, a goaf 21, a high-position drill site 22, a fully mechanized mining working surface 23 and a grouting device 24, the grouting device 24 comprises a main pipeline 1, a grouting branch pipe I2, a grouting branch pipe II 3, an electric three-way regulating valve 6, a quantitative addition pump 8, a pulping pool 9, a stirring pump 10, a digital display rotary viscometer 11, a control panel 12, a pneumatic grouting pump 13, a control valve 14, a pressure gauge 15, a flowmeter 16, a pressure equalizer 17 and a pressure regulating valve 19, the main pipeline 1 is arranged in the return airway 20, the pressure gauge 15, the flowmeter 16 and the control valve 14 are arranged on the main pipeline 1, the pneumatic grouting pump 13 is connected at the inlet of the main pipeline 1, the pneumatic grouting pump 13 is provided with the pressure regulating valve 19, a pneumatic grouting pump 13 is connected with a pulping tank 9, a quantitative addition pump 8 is arranged on the left side of the pulping tank 9, a stirring pump 10 is arranged right above the pulping tank 9, a digital display rotary viscometer 11 and a control panel 12 are arranged on the stirring pump 10, the control panel 12 is connected with the pneumatic grouting pump 13, the digital display rotary viscometer 11, the stirring pump 10 and an electric three-way valve 6, the outlet of a main pipeline 1 is connected with a grouting branch pipe I2 and a grouting branch pipe II 3 through the electric three-way regulating valve 6, the grouting branch pipe I2 is provided with a pressure equalizer I17, the grouting branch pipe I2 is connected with a grouting branch pipe network I4, a second pressure equalizer 18 is arranged on the second grouting branch pipe 3, the second grouting branch pipe 3 is connected with a second grouting branch pipe network 5, the tail ends of the grouting branch pipe network I4 and the grouting branch pipe network II 5 are connected with steel perforated pipes 7, and the grouting branch pipe network I4 and the grouting branch pipe network II 5 are inserted into the goaf 21 through a high-position drill site 22.
Secondly, the thixotropic gel material is mixed with water by a dosing pump 8 according to a ratio of 1: 4, putting the mixture into a slurry making pool 9 in proportion, stirring the mixture by a stirring pump 10 to prepare slurry, measuring the viscosity of the slurry in real time by adopting a digital display rotational viscometer 11, transmitting a viscosity signal to a control panel 12, opening a control valve 14 on the main pipeline 1 when the viscosity of the slurry is 60-70 mPa.s, adjusting an electric three-way valve 6 by the control panel 12 to communicate the main pipeline 1 with the first grouting branch pipe 2, and closing the second grouting branch pipe 3;
and thirdly, starting a pneumatic grouting pump 13 to inject slurry into the gob 21 through a grouting branch pipe network I4, adjusting an electric three-way valve 6 by a control panel 12 after 20min of grouting to communicate a main pipeline 1 with a grouting branch pipe II 3, closing a grouting branch pipe I2, continuously injecting the slurry into the gob 23 through a grouting branch pipe network II 5 by the pneumatic grouting pump 13, adjusting the electric three-way valve 6 by the control panel 12 after 20min of grouting again to communicate the main pipeline 1 with the grouting branch pipe I2, continuing to inject the slurry into the gob 21, and then sequentially and circularly reciprocating until grouting is completed.
The pressure of each slip casting branch pipe is equal, slip casting in slip casting branch pipe network one 4 and the slip casting branch pipe network two 5 is in proper order staggered arrangement between the branch pipe, slip casting branch pipe network one 4 and the slip casting divide the steel floral tube 7 length that pipe network two 5 are connected to be 5m, steel floral tube 7 end is airtight to be located same water flat line, be on a parallel with combine and adopt 23 trend directions on the working face. The main pipeline 1, the first grouting branch pipe 2 and the second grouting branch pipe 3 are high-pressure rubber pipes, and the first grouting branch pipe network 4 and the second grouting branch pipe network 5 are seamless steel pipes. The digital display rotational viscometer 11 monitors the viscosity of grouting slurry and transmits a viscosity signal to the control panel 12, when the viscosity of the grouting slurry is 200mPa · s-300 mPa · s, the control panel 12 controls the pneumatic grouting pump 13 to be closed to stop grouting, and simultaneously controls the stirring pump 10 to operate at a rotation speed of 1200r/min, when the viscosity of the grouting slurry is 60mPa · s-70 mPa · s, the control panel 12 controls the stirring pump 10 to operate at a rotation speed of 100r/min, and simultaneously starts the pneumatic grouting pump 13 to start grouting. The pneumatic grouting pump 13 adjusts the grouting pressure thereof through a pressure regulating valve 19.
Example 2
The method comprises the following steps:
firstly, the invention utilizes a high-position drill site 22 for extracting gas in a return airway 20 of a high gas mine to lay a grouting pipe network, wherein the grouting pipe network consists of a grouting branch pipe network I4, a grouting branch pipe network II 5, a steel flower pipe 7, a return airway 20, a goaf 21, a high-position drill site 22, a fully mechanized mining working surface 23 and a grouting device 24, the grouting device 24 comprises a main pipeline 1, a grouting branch pipe I2, a grouting branch pipe II 3, an electric three-way regulating valve 6, a quantitative addition pump 8, a pulping pool 9, a stirring pump 10, a digital display rotary viscometer 11, a control panel 12, a pneumatic grouting pump 13, a control valve 14, a pressure gauge 15, a flowmeter 16, a pressure equalizer 17 and a pressure regulating valve 19, the main pipeline 1 is arranged in the return airway 20, the pressure gauge 15, the flowmeter 16 and the control valve 14 are arranged on the main pipeline 1, the pneumatic grouting pump 13 is connected at the inlet of the main pipeline 1, the pneumatic grouting pump 13 is provided with the pressure regulating valve 19, a pneumatic grouting pump 13 is connected with a pulping tank 9, a quantitative addition pump 8 is arranged on the left side of the pulping tank 9, a stirring pump 10 is arranged right above the pulping tank 9, a digital display rotary viscometer 11 and a control panel 12 are arranged on the stirring pump 10, the control panel 12 is connected with the pneumatic grouting pump 13, the digital display rotary viscometer 11, the stirring pump 10 and an electric three-way valve 6, the outlet of a main pipeline 1 is connected with a grouting branch pipe I2 and a grouting branch pipe II 3 through the electric three-way regulating valve 6, the grouting branch pipe I2 is provided with a pressure equalizer I17, the grouting branch pipe I2 is connected with a grouting branch pipe network I4, a second pressure equalizer 18 is arranged on the second grouting branch pipe 3, the second grouting branch pipe 3 is connected with a second grouting branch pipe network 5, the tail ends of the grouting branch pipe network I4 and the grouting branch pipe network II 5 are connected with steel perforated pipes 7, and the grouting branch pipe network I4 and the grouting branch pipe network II 5 are inserted into the goaf 21 through a high-position drill site 22.
Secondly, the thixotropic gel material is mixed with water by a dosing pump 8 according to a ratio of 1: 5, putting the mixture into a slurry making pool 9 in proportion, stirring the mixture by a stirring pump 10 to prepare slurry, measuring the viscosity of the slurry in real time by adopting a digital display rotational viscometer 11, transmitting a viscosity signal to a control panel 12, opening a control valve 14 on the main pipeline 1 when the viscosity of the slurry is 50-60 mPa.s, adjusting an electric three-way valve 6 by the control panel 12 to communicate the main pipeline 1 with a first grouting branch pipe 2, and closing a second grouting branch pipe 3;
and thirdly, starting a pneumatic grouting pump 13 to inject slurry into the gob 21 through a grouting branch pipe network I4, adjusting an electric three-way valve 6 by a control panel 12 after 30min of grouting to communicate a main pipeline 1 with a grouting branch pipe II 3, closing a grouting branch pipe I2, continuously injecting the slurry into the gob 23 through a grouting branch pipe network II 5 by the pneumatic grouting pump 13, after 30min of grouting again, adjusting the electric three-way valve 6 by the control panel 12 to communicate the main pipeline 1 with the grouting branch pipe I2, continuing to inject the slurry into the gob 21, and then sequentially and circularly reciprocating until grouting is completed.
The pressure of each slip casting branch pipe is equal, slip casting in slip casting branch pipe network one 4 and the slip casting branch pipe network two 5 is in proper order staggered arrangement between the branch pipe, slip casting branch pipe network one 4 and the slip casting divide the steel floral tube 7 length that pipe network two 5 are connected to be 4m, steel floral tube 7 end is airtight to be located same water flat line, be on a parallel with combine and adopt 23 trend directions on the working face. The main pipeline 1, the first grouting branch pipe 2 and the second grouting branch pipe 3 are high-pressure rubber pipes, and the first grouting branch pipe network 4 and the second grouting branch pipe network 5 are seamless steel pipes. The digital display rotational viscometer 11 monitors the viscosity of grouting slurry, transmits a viscosity signal to the control panel 12, when the viscosity of the grouting slurry is 250 mPa.s-350 mPa.s, the control panel 12 controls the pneumatic grouting pump 13 to be closed, stops grouting, simultaneously controls the stirring pump 10 to operate at a rotating speed of 1100r/min, when the viscosity of the grouting slurry is 50 mPa.s-60 mPa.s, the control panel 12 controls the stirring pump 10 to operate at a rotating speed of 80r/min, simultaneously starts the pneumatic grouting pump 13, and starts grouting. The pneumatic grouting pump 13 adjusts the grouting pressure thereof through a pressure regulating valve 19.
Example 3
The method comprises the following steps:
firstly, the invention utilizes a high-position drill site 22 for extracting gas in a return airway 20 of a high gas mine to lay a grouting pipe network, wherein the grouting pipe network consists of a grouting branch pipe network I4, a grouting branch pipe network II 5, a steel flower pipe 7, a return airway 20, a goaf 21, a high-position drill site 22, a fully mechanized mining working surface 23 and a grouting device 24, the grouting device 24 comprises a main pipeline 1, a grouting branch pipe I2, a grouting branch pipe II 3, an electric three-way regulating valve 6, a quantitative addition pump 8, a pulping pool 9, a stirring pump 10, a digital display rotary viscometer 11, a control panel 12, a pneumatic grouting pump 13, a control valve 14, a pressure gauge 15, a flowmeter 16, a pressure equalizer 17 and a pressure regulating valve 19, the main pipeline 1 is arranged in the return airway 20, the pressure gauge 15, the flowmeter 16 and the control valve 14 are arranged on the main pipeline 1, the pneumatic grouting pump 13 is connected at the inlet of the main pipeline 1, the pneumatic grouting pump 13 is provided with the pressure regulating valve 19, a pneumatic grouting pump 13 is connected with a pulping tank 9, a quantitative addition pump 8 is arranged on the left side of the pulping tank 9, a stirring pump 10 is arranged right above the pulping tank 9, a digital display rotary viscometer 11 and a control panel 12 are arranged on the stirring pump 10, the control panel 12 is connected with the pneumatic grouting pump 13, the digital display rotary viscometer 11, the stirring pump 10 and an electric three-way valve 6, the outlet of a main pipeline 1 is connected with a grouting branch pipe I2 and a grouting branch pipe II 3 through the electric three-way regulating valve 6, the grouting branch pipe I2 is provided with a pressure equalizer I17, the grouting branch pipe I2 is connected with a grouting branch pipe network I4, a second pressure equalizer 18 is arranged on the second grouting branch pipe 3, the second grouting branch pipe 3 is connected with a second grouting branch pipe network 5, the tail ends of the grouting branch pipe network I4 and the grouting branch pipe network II 5 are connected with steel perforated pipes 7, and the grouting branch pipe network I4 and the grouting branch pipe network II 5 are inserted into the goaf 21 through a high-position drill site 22.
Secondly, the thixotropic gel material is mixed with water by a dosing pump 8 according to a ratio of 1: 5, putting the mixture into a slurry making pool 9 in proportion, stirring the mixture by a stirring pump 10 to prepare slurry, measuring the viscosity of the slurry in real time by adopting a digital display rotational viscometer 11, transmitting a viscosity signal to a control panel 12, opening a control valve 14 on the main pipeline 1 when the viscosity of the slurry is 40-50 mPa.s, adjusting an electric three-way valve 6 by the control panel 12 to communicate the main pipeline 1 with a first grouting branch pipe 2, and closing a second grouting branch pipe 3;
and thirdly, starting a pneumatic grouting pump 13 to inject slurry into the gob 21 through a grouting branch pipe network I4, adjusting an electric three-way valve 6 by a control panel 12 after 40min of grouting to communicate a main pipeline 1 with a grouting branch pipe II 3, closing a grouting branch pipe I2, continuously injecting the slurry into the gob 23 through a grouting branch pipe network II 5 by the pneumatic grouting pump 13, adjusting the electric three-way valve 6 by the control panel 12 after 40min of grouting again to communicate the main pipeline 1 with the grouting branch pipe I2, continuing to inject the slurry into the gob 21, and then sequentially and circularly reciprocating until grouting is completed.
The pressure of each slip casting branch pipe is equal, slip casting in slip casting branch pipe network one 4 and the slip casting branch pipe network two 5 is in proper order staggered arrangement between the branch pipe, slip casting branch pipe network one 4 and the slip casting divide the steel floral tube 7 length that pipe network two 5 are connected to be 3m, steel floral tube 7 end is airtight to be located same water flat line, be on a parallel with combine and adopt 23 trend directions on the working face. The main pipeline 1, the first grouting branch pipe 2 and the second grouting branch pipe 3 are high-pressure rubber pipes, and the first grouting branch pipe network 4 and the second grouting branch pipe network 5 are seamless steel pipes. The digital display rotational viscometer 11 monitors the viscosity of grouting slurry and transmits a viscosity signal to the control panel 12, when the viscosity of the grouting slurry is 300-400 mPa.s, the control panel 12 controls the pneumatic grouting pump 13 to be closed to stop grouting, and simultaneously controls the stirring pump 10 to operate at a rotating speed of 1000r/min, when the viscosity of the grouting slurry is 40-50 mPa.s, the control panel 12 controls the stirring pump 10 to operate at a rotating speed of 60r/min, and simultaneously starts the pneumatic grouting pump 13 to start grouting. The pneumatic grouting pump 13 adjusts the grouting pressure thereof through a pressure regulating valve 19.
Claims (7)
1. An intermittent grouting fire prevention and extinguishing method for a high-gas mine high-position extraction drill site is characterized in that a high-position drill site (22) for extracting gas in a high-gas mine return air way (20) is used for paving a grouting pipe network, the viscosity of slurry is monitored in real time through a grouting device (24) and is enabled to be not more than 200 mPa.s-400 mPa.s all the time, meanwhile, intermittent alternate grouting is performed on the inside of a goaf through a first grouting branch pipe (2) and a second grouting branch pipe (3), the slurry is enabled to be stacked from a low position to a high position in the direction of a fully mechanized mining face in the goaf, and sufficient time is provided for gelling, so that air leakage is prevented.
2. The intermittent grouting fire prevention and extinguishing method for the high-gas mine high-position extraction drill site according to claim 1, characterized in that the grouting pipe network consists of a grouting branch pipe network I (4), a grouting branch pipe network II (5), a steel perforated pipe (7), a return airway (20), a goaf (21), a high-position drill site (22), a fully mechanized mining face (23) and a grouting device (24), wherein the grouting device (24) comprises a main pipeline (1), a grouting branch pipe I (2), a grouting branch pipe II (3), an electric three-way regulating valve (6), a quantitative addition pump (8), a pulping pool (9), a stirring pump (10), a digital display rotary viscometer (11), a control plate (12), a pneumatic grouting pump (13), a control valve (14), a pressure gauge (15), a flow meter (16), a pressure equalizer (17) and a pressure regulating valve (19), the main pipeline (1) is arranged in the return airway (20), the system is characterized in that a pressure gauge (15), a flowmeter (16) and a control valve (14) are installed on a main pipeline (1), a pneumatic grouting pump (13) is connected to an inlet of the main pipeline (1), a pressure regulating valve (19) is installed on the pneumatic grouting pump (13), the pneumatic grouting pump (13) is connected with a pulping pool (9), a quantitative addition pump (8) is installed on the left side of the pulping pool (9), a stirring pump (10) is installed right above the pulping pool (9), a digital display rotational viscometer (11) and a control panel (12) are installed on the stirring pump (10), the control panel (12) is connected with the pneumatic grouting pump (13), the digital display rotational viscometer (11), the stirring pump (10) and an electric three-way valve (6), a grouting branch pipe I (2) and a grouting branch pipe II (3) are connected at an outlet of the main pipeline (1) through the electric three-way regulating valve (6), and a pressure equalizer I (17) is installed on the grouting branch pipe I (2), the grouting branch pipe I (2) is connected with a grouting branch pipe network I (4), a pressure equalizer II (18) is installed on the grouting branch pipe II (3), the grouting branch pipe network II (3) is connected with a grouting branch pipe network II (5), the ends of the grouting branch pipe network I (4) and the grouting branch pipe network II (5) are connected with a steel perforated pipe (7), and the grouting branch pipe network I (4) and the grouting branch pipe network II (5) are inserted into a goaf (21) through a high-position drill site (22).
3. The intermittent grouting fire prevention and extinguishing method for the high-position extraction drill site of the high gas mine according to claim 1, characterized in that a quantitative addition pump (8) is used for mixing a gel material with thixotropy and water according to the ratio of 1: 4 or 1: 5 or 1: 6, putting the mixture into a slurry making pool (9) in proportion, making slurry through stirring by a stirring pump (10), measuring the viscosity of the slurry in real time by adopting a digital display rotary viscometer (11), transmitting a viscosity signal to a control panel (12), opening a control valve (14) on a main pipeline (1) when the viscosity of the slurry is 40-70 mPa.s, adjusting an electric three-way valve (6) through the control panel (12) to communicate the main pipeline (1) to a first grouting branch pipe (2), closing a second grouting branch pipe (3), starting a pneumatic grouting pump (13), injecting the slurry into a goaf (21) through a first grouting branch pipe network (4), adjusting the electric three-way valve (6) through the control panel (12) to communicate the main pipeline (1) to a second grouting branch pipe (3) after grouting for 20-40 min, closing the first grouting branch pipe (2), and continuously injecting the slurry into the goaf (23) through a second grouting branch pipe network (5) by the pneumatic grouting pump (13), and after grouting for 20-40 min again, the control panel (12) adjusts the electric three-way valve (6) to communicate the main pipe (1) with the grouting branch pipe I (2), closes the grouting branch pipe II (3), continues to inject slurry into the goaf (21), and then circularly reciprocates in sequence until grouting is finished.
4. The fire prevention and extinguishing method for intermittently grouting a gob by using the high-position drilling site under the high-gas coal mine according to claim 1, wherein the pressures of all grouting branch pipes are equal.
5. The fire prevention and extinguishing method for intermittently grouting a goaf by using the high-position drilling site under the high-gas coal mine according to claim 1, characterized in that grouting branch pipe networks I (4) and grouting branch pipes in a grouting branch pipe network II (5) are sequentially arranged in a staggered manner, the length of a steel perforated pipe (7) connected with the grouting branch pipe networks I (4) and the grouting branch pipe network II (5) is 3-5 m, and the tail ends of the steel perforated pipes (7) are closed, are positioned on the same horizontal line and are parallel to the moving direction of a fully mechanized mining face (23).
6. The fire prevention and extinguishing method for intermittently grouting a gob by using the high-position drilling site under the high-gas coal mine according to claim 1, wherein the main pipeline (1), the grouting branch pipe I (2) and the grouting branch pipe II (3) are high-pressure rubber pipes, and the grouting branch pipe network I (4) and the grouting branch pipe network II (5) are seamless steel pipes.
7. The fire prevention and extinguishing method for intermittently grouting a goaf by using the high-position drilling site under the high-gas coal mine according to claim 1, characterized in that the digital display rotational viscometer (11) monitors the viscosity of the grouting slurry and transmits a viscosity signal to the control panel (12), when the viscosity of the grouting slurry is 200 to 400mPa, the control panel (12) controls the pneumatic grouting pump (13) to be closed, the grouting is stopped, the stirring pump (10) is controlled to operate at a rotating speed of 1000 to 1200r/min, when the viscosity of the grouting slurry is 40 to 70mPa, the control panel (12) controls the stirring pump (10) to operate at a rotating speed of 60 to 100r/min, and the pneumatic grouting pump (13) is started to start the grouting.
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