Coal mine underground crossing drill hole gas pressure measuring system

Abstract

The utility model discloses a coal mine underground crossing drilling gas pressure measuring system which comprises a grouting pump, a mortar pool, a cement pool, a first connecting rubber pipe, a second connecting rubber pipe, a grouting pipe, a slurry return water discharging pipe, a gas pressure monitoring pipe, an anti-collapse ventilation cage and a pressure gauge. The slurry return water discharge pipe is connected with the mortar pool through a second connecting rubber pipe, the pressure gauge is arranged on the gas pressure monitoring pipe, the length of the portion, stretching into the drill hole, of the grouting pipe is larger than the length of the portion, stretching into the drill hole, of the slurry return water discharge pipe, and the length of the portion, stretching into the drill hole, of the gas pressure monitoring pipe is smaller than the length of the portion, stretching into the drill hole, of the gas pressure monitoring pipe. An outlet of the flushing water pump is connected with a second connecting rubber pipe, and an outlet of the second connecting rubber pipe is connected with a lower port of the slurry return blow-off pipe through a quick connector. The gas monitoring system solves the technical problem that the smooth proceeding of gas monitoring work is affected due to hole collapse and blockage of a slurry return blow-off pipe in an existing monitoring system.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine gas pressure measurement, and in particular relates to a coal mine underground layer-penetrating drilling gas pressure measurement system. Background Art

[0002] Gas pressure measurement plays an extremely critical role in coal mine production safety. It is the core indicator for accurately grasping the gas pressure status of coal seams and judging the danger of gas outbursts. The accuracy and reliability of its measured values ​​are directly related to the safety of coal mine production operations. Due to the characteristics of coal seams, boreholes are prone to instability, deformation, and even collapse under the interference of complex environments such as gas fields, stress fields, and mining disturbances. Deformation or even collapse of boreholes will affect the monitoring results of gas pressure. In addition, the return pipe of the existing coal mine underground through-layer drilling gas pressure measurement system is prone to blockage. Since coal rock fissure water accumulates at the front end of the test borehole and even enters the gas pressure monitoring pipe, the accuracy and reliability of the gas pressure measurement cannot be guaranteed. Therefore, there is a need for a coal mine underground through-layer drilling gas pressure measurement system with a simple structure that can prevent the test borehole from collapsing and prevent the return pipe from being blocked, thereby ensuring that the gas pressure measurement results are accurate and reliable. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, the utility model provides a coal mine underground through-layer drilling gas pressure measurement system with a simple structure that can prevent the test borehole from collapsing and the return pipe from being blocked, thereby ensuring that the gas pressure measurement results are accurate and reliable.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a coal mine underground through-layer drilling gas pressure measurement system, including a grouting pump, a mortar pool, a cement pool, a flushing water pump, a first connecting hose, a second connecting hose, a grouting pipe, a slurry discharge pipe, a gas pressure monitoring pipe, an anti-collapse air cage and a pressure gauge. The grouting pump is connected to the grouting pipe through the first connecting hose, and the pressure gauge is arranged on the gas pressure monitoring pipe. The length of the grouting pipe extending into the borehole is less than the length of the slurry discharge pipe extending into the borehole and less than the length of the gas pressure monitoring pipe extending into the borehole. The anti-collapse air cage is arranged at the front end of the gas pressure monitoring pipe. The flushing water pump outlet is connected to the second connecting hose, and the outlet of the second connecting hose is connected to the lower port of the slurry discharge pipe through a quick connector.

[0005] The anti-collapse breathable cage includes a number of supporting cross bars arranged on the circumference of the gas pressure monitoring tube and parallel to the gas pressure monitoring tube. The front ends of the several supporting cross bars are connected to a number of supporting oblique bars. The front ends of the several supporting oblique bars are inclined toward the extension line of the gas pressure monitoring tube and converge at a point on the extension line of the gas pressure monitoring tube to form a tip; a number of supporting rings are arranged between the several supporting cross bars, and a number of supporting vertical bars are arranged between the supporting cross bars and the gas pressure monitoring tube.

[0006] The grouting pump is connected with the cement pool through the first suction pipe, and the grouting pump is connected with the mortar pool through the second suction pipe.

[0007] The grouting pipe is provided with a grouting switch, the backflow pipe is provided with a backflow switch, and the gas pressure monitoring pipe is provided with a monitoring switch.

[0008] The backflow pipe is connected with the water drainer through the connecting pipe, and the connecting pipe is provided with a pipe switch.

[0009] The support horizontal rods, the support vertical rods and the support rings are welded with each other.

[0010] The flushing water pump is connected with the water storage tank through the high-pressure water pipe.

[0011] The flushing water pump outlet of the application is connected with the second connecting rubber pipe outlet, and the second connecting rubber pipe outlet is connected with the lower end of the backflow pipe through the quick connector. After twice grouting, the second cement mortar can flow back through the backflow pipe, so that the grouting depth of the second time is ensured, and more cement mortar is retained in the backflow pipe, which is easy to cause the blockage of the backflow pipe, so that the backflow of the subsequent drilling hole cannot flow back through the backflow pipe, and the gas monitoring work cannot be carried out smoothly. However, the application injects high-pressure water into the backflow pipe through the flushing water pump after twice grouting, so that the backflow pipe is kept unblocked, and the influence of the blockage of the backflow pipe on the gas monitoring work is effectively prevented.

[0012] The front end of the gas pressure monitoring pipe is provided with an anti-collapse gas permeable cage, which can effectively prevent the drilling hole from collapsing. Specifically, the anti-collapse gas permeable cage comprises a plurality of support horizontal rods arranged on the circumference of the gas pressure monitoring pipe and parallel to the gas pressure monitoring pipe, the front end of the plurality of support horizontal rods is connected with a plurality of support inclined rods, the front end of the plurality of support inclined rods is inclined to the extension line of the central axis of the gas pressure monitoring pipe, and converges on a point on the extension line of the central axis of the gas pressure monitoring pipe to form a pointed end; a plurality of support rings are arranged between the plurality of support horizontal rods, and a plurality of support vertical rods are arranged between the support horizontal rods and the gas pressure monitoring pipe. The plurality of support horizontal rods and the plurality of support vertical rods can effectively support the inner wall of the drilling hole, so that the phenomenon of hole collapse is prevented.

[0013] In summary, the application has the advantages of simple structure and convenient operation. The anti-collapse gas permeable cage arranged at the front end of the gas pressure monitoring pipe can effectively prevent the drilling hole from collapsing, and the high-pressure water is injected into the backflow pipe through the corresponding water pump, so that the backflow pipe is kept unblocked. The technical problem that the existing monitoring system affects the gas pressure measurement result due to hole collapse and blockage of the backflow pipe is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic diagram of the application;

[0015] Figure 2 is Figure 1 A enlarged view of the middle A part.

[0016] Figure 3 is a structural schematic view of the anti-collapse gas permeable cage. DETAILED DESCRIPTION

[0017] As Figures 1-3 shown, the utility model discloses a coal mine underground wear layer drilling gas pressure measuring system, including grouting pump 1, mortar pool 2, cement pool 3, first connecting rubber pipe 4, second connecting rubber pipe 5, grouting pipe 6, back slurry drain pipe 7, gas pressure monitoring pipe 8, anti-collapse gas permeable cage, pressure gauge 9, grouting pump 1 is connected grouting pipe 6 through first connecting rubber pipe 4, pressure gauge 9 sets up on gas pressure monitoring pipe 8, the length of grouting pipe 6 that stretches into borehole 16 is less than the length of back slurry drain pipe 7 that stretches into borehole 16 is less than the length of gas pressure monitoring pipe 8 that stretches into borehole 16, and anti-collapse gas permeable cage sets up at the front end of gas pressure monitoring pipe 8, and the outlet of flushing water pump 20 is connected with second connecting rubber pipe 5, and the outlet of second connecting rubber pipe 5 is connected with the lower end of back slurry drain pipe 7 through quick plug connector.

[0018] Anti-collapse gas permeable cage includes the setting in the circumference of gas pressure monitoring pipe 8 and parallel to the several support cross bars 18 of gas pressure monitoring pipe 8, and the front end of several support cross bars 18 is connected with several support inclined rods 19, and the front end of several support inclined rods 19 is inclined to the extension line of the central axis of gas pressure monitoring pipe 8 and converges on the extension line of the central axis of gas pressure monitoring pipe 8 and forms the tip portion at a point;Several support rings 22 are arranged between several support cross bars 18, and several support vertical rods 17 are arranged between support cross bar 18 and gas pressure monitoring pipe 8. Grouting pump 1 is connected cement pool 3 through first suction pipe, and grouting pump 1 is connected mortar pool 2 through second suction pipe;Grouting switch 12 is arranged on grouting pipe 6, back slurry switch 13 is arranged on back slurry drain pipe 7, and monitoring switch 14 is arranged on gas pressure monitoring pipe 8;Support cross bar 18, support vertical rod 17, support ring 22 are welded with each other;Back slurry drain pipe 7 is connected water drainer 21 through connecting pipeline 23, and pipeline switch 15 is arranged on connecting pipeline 23.

[0019] In specific use, the grouting pipe 6, the gas pressure monitoring pipe 8 and the back grouting and water discharge pipe 7 are sequentially installed in the drill hole 16, the quick-drying cement 10 in the cement pool 3 is first pumped by the grouting pump 1, the quick-drying cement 10 is injected into the drill hole 16 through the grouting pipe 6, the injection amount does not exceed the depth of the grouting pipe 6 inserted into the drill hole 16, after the quick-drying cement 10 is quickly coagulated, the cement mortar 11 in the mortar pool 2 is pumped by the grouting pump 1, the cement mortar 11 is again injected into the drill hole 16 through the grouting pipe 6, until the cement mortar 11 starts to flow back in the back grouting and water discharge pipe 7, at this time, the outlet of the second connecting rubber pipe 5 has not been connected with the lower port of the back grouting and water discharge pipe 7 through the quick plug connector, so when the back grouting and water discharge pipe 7 starts to flow back the cement mortar 11, the staff can see the cement mortar 11 flowing out, and quickly stop grouting, in order to ensure that the back grouting and water discharge pipe 7 is not blocked by the cement mortar 11, affecting the accumulation and drainage of coal rock fissure water, the outlet of the second connecting rubber pipe 5 is connected with the lower port of the back grouting and water discharge pipe 7 through the quick plug connector, high-pressure water is injected into the back grouting and water discharge pipe 7 through the flushing water pump 20, a small amount of high-pressure water flows into the cement mortar 11 or flows back through the back grouting and water discharge pipe 7 again, without affecting the concentration of the cement mortar 11 and the normal monitoring of gas, the anti-collapse air permeable cage at the front end of the gas pressure monitoring pipe 8 can effectively prevent the occurrence of hole collapse, ensure the normal backflow of the back grouting and water discharge pipe 7 and the discharge of fissure water, and the normal monitoring work of the gas pressure monitoring pipe 8.

[0020] The outlet of the flushing water pump 20 is connected with the second connecting rubber pipe 5, the outlet of the second connecting rubber pipe 5 is connected with the lower port of the back grouting and water discharge pipe 7 through the quick plug connector, after two times of grouting, the second cement mortar 11 will flow back through the back grouting and water discharge pipe 7, to ensure the second grouting depth, more cement mortar 11 stays in the back grouting and water discharge pipe 7, which is easy to cause the blockage of the back grouting and water discharge pipe 7, so that the coal rock fissure water in the subsequent drill hole 16 cannot flow back through the back grouting and water discharge pipe 7, resulting in that the gas monitoring work cannot be carried out smoothly, while the application injects high-pressure water into the back grouting and water discharge pipe 7 through the flushing water pump 20 after two times of grouting, to keep the back grouting and water discharge pipe 7 unblocked, effectively preventing the blockage of the back grouting and water discharge pipe 7 from affecting the gas monitoring work. The pressure gauge 9 adopts a pointer type mechanical instrument, the staff observes the pressure gauge 9 multiple times at regular intervals every day, and records the pressure indication, to monitor the gas pressure in the gas test drill hole.

[0021] The front end of the gas pressure monitoring pipe 8 is provided with an anti-collapse gas permeable cage, which can effectively prevent the drilling hole 16 from collapsing, and specifically, the anti-collapse gas permeable cage comprises a plurality of supporting horizontal rods 18 arranged at the circumference of the gas pressure monitoring pipe 8 and parallel to the gas pressure monitoring pipe 8, the front end of the plurality of supporting horizontal rods 18 is connected with a plurality of supporting inclined rods 19, the front end of the plurality of supporting inclined rods 19 is inclined to the extension line of the central axis of the gas pressure monitoring pipe 8 and converges on a point on the extension line of the central axis of the gas pressure monitoring pipe 8 to form a pointed end; a plurality of supporting rings 22 are arranged between the plurality of supporting horizontal rods 18, and a plurality of supporting vertical rods 17 are arranged between the supporting horizontal rods 18 and the gas pressure monitoring pipe 8. The inner wall of the drilling hole 16 can be effectively supported by the plurality of supporting horizontal rods 18 and the plurality of supporting vertical rods 17, so that the phenomenon of hole collapse of the drilling hole 16 is prevented. The utility model has the advantages of simple structure and convenient operation, the anti-collapse gas permeable cage arranged at the front end of the gas pressure monitoring pipe 8 can effectively prevent the drilling hole 16 from collapsing, and the corresponding flushing water pump 20 is arranged to inject high-pressure water into the back slurry drainage pipe 7, so that the back slurry drainage pipe 7 is kept unblocked, and the technical problem that the existing monitoring system is affected by hole collapse and blockage of the back slurry drainage pipe 7 and cannot smoothly carry out gas monitoring is effectively solved.

[0022] It should be noted that the grouting pump 1, the pressure gauge 9, the flushing water pump 20, the quick connector and the valves are all prior art and can be purchased in the market, so the specific structure is not described.

[0023] The embodiment is not limited in shape, material, structure and the like of the utility model in any form, and any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model are all within the protection scope of the technical scheme of the utility model.

Claims

1. A gas pressure measurement system for underground coal mine through-layer drilling, characterized by: It includes a grouting pump, a mortar pool, a cement pool, a flushing water pump, a first connecting hose, a second connecting hose, a grouting pipe, a slurry discharge pipe, a gas pressure monitoring pipe, an anti-collapse air cage and a pressure gauge. The grouting pump is connected to the grouting pipe through the first connecting hose. The pressure gauge is arranged on the gas pressure monitoring pipe. The length of the grouting pipe extending into the borehole is less than the length of the slurry discharge pipe extending into the borehole. The anti-collapse air cage is arranged at the front end of the gas pressure monitoring pipe. The outlet of the flushing water pump is connected to the second connecting hose. The outlet of the second connecting hose is connected to the lower end of the slurry discharge pipe through a quick connector.

2. The underground coal mine through-layer drilling gas pressure measurement system according to claim 1, characterized in that: The anti-collapse breathable cage includes a number of supporting cross bars arranged on the circumference of the gas pressure monitoring tube and parallel to the gas pressure monitoring tube. The front ends of the several supporting cross bars are connected to a number of supporting oblique bars. The front ends of the several supporting oblique bars are inclined toward the extension line of the gas pressure monitoring tube and converge at a point on the extension line of the gas pressure monitoring tube to form a tip; a number of supporting rings are arranged between the several supporting cross bars, and a number of supporting vertical bars are arranged between the supporting cross bars and the gas pressure monitoring tube.

3. The underground coal mine through-layer drilling gas pressure measurement system according to claim 2, characterized in that: The grouting pump is connected to the cement pool through a first suction pipe, and the grouting pump is connected to the mortar pool through a second suction pipe.

4. A coal mine underground through-layer drilling gas pressure measurement system according to claim 3, characterized in that: The grouting pipe is provided with a grouting switch, the grouting drain pipe is provided with a grouting switch, and the gas pressure monitoring pipe is provided with a monitoring switch.

5. A coal mine underground through-layer drilling gas pressure measurement system according to claim 4, characterized in that: The slurry discharge pipe is connected to the water discharger through a connecting pipe, and a pipe switch is provided on the connecting pipe.

6. A coal mine underground through-layer drilling gas pressure measurement system according to claim 5, characterized in that: The supporting horizontal bars, supporting vertical bars and supporting rings are welded to each other.

7. A coal mine underground through-layer drilling gas pressure measurement system according to claim 6, characterized in that: The flushing water pump is connected to a water storage tank through a high-pressure water pipe.

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