Gas collection method for advanced pre-splitting blasting in steeply inclined super-thick coal seam

Abstract

This invention provides a method for collecting gases from the pre-splitting blasting of steeply inclined, extra-thick coal seams, comprising: S1: calculating the blasting parameters for pre-splitting blasting of steeply inclined, extra-thick coal seams and determining the construction location of the blasting holes; S2: combining the blasting parameters, empirical formulas, and theoretical calculations to determine the composition and pressure of the harmful gases generated after the pre-splitting blasting of steeply inclined, extra-thick coal seams, and fixing a gas collection device at the orifice of the blasting hole; S3: selecting an extraction system based on the content of the harmful gases generated after blasting, and discharging the harmful gases collected by the gas collection device through the extraction system; S4: comparing the composition and content of the harmful gases generated after blasting with the gas drawn into the extraction system to verify the extraction effect of the extraction system. The technical solution provided by this invention can solve the problem in existing technologies of not discharging the harmful gases generated after pre-splitting blasting.

Description

Technical Field

[0001] This invention relates to the field of mining engineering technology, and more specifically, to a method for collecting pre-fracture blasting gas in steeply inclined extra-thick coal seams. Background Technology

[0002] Currently, the dip angle of inclined coal seams is generally greater than 45°, while for steeply inclined extra-thick coal seams, the dip angle is greater than 80° and the thickness is greater than 8m, even reaching tens of meters. For the top coal of horizontally segmented fully mechanized longwall mining faces of steeply inclined extra-thick coal seams, the use of advanced pre-splitting and weakening is one of the prerequisites for achieving safe and efficient mining. This method primarily involves constructing pre-splitting blasting holes along the dip direction in the roadway 30m away from the coal face of the fully mechanized top caving face. Mine-approved explosives are then loaded into these holes and blasted. Ultimately, based on the internal dynamic principle of the explosives, the detonation gases generated during the explosion within the coal seam cause the coal to fracture and loosen, fully breaking it up to increase the ventability of the top coal and reduce stress concentration in the top coal of the working face. However, the blasting of the explosives in the pre-splitting blasting holes in the fully mechanized top caving face, in addition to producing fumes, releases other toxic and harmful gases contained in the coal seam in the short term, causing the gas levels in the return airway of the fully mechanized top caving face to exceed limits.

[0003] In existing technologies, for top coal seams in horizontally segmented fully mechanized longwall top coal caving faces with steeply inclined and extra-thick coal seams, no specific safety measures are taken for the toxic and harmful gases generated during the pre-splitting and weakening process. Instead, these gases are directly discharged into the intake airway of the longwall top coal caving face. After blasting, the natural wind pressure will discharge the toxic and harmful gases into the return airway, which will affect the continuous and efficient production of the longwall top coal caving face. Summary of the Invention

[0004] This invention provides a method for collecting gases from pre-splitting blasting in steeply inclined, extra-thick coal seams, thereby addressing the problem in existing technologies that do not address the emission of harmful gases generated after pre-splitting blasting.

[0005] To address the aforementioned problems, this invention provides a method for collecting blasting gases from the pre-splitting blast of steeply inclined extra-thick coal seams, comprising: S1: calculating the blasting parameters for the pre-splitting blast of steeply inclined extra-thick coal seams and determining the construction location of the blasting holes; S2: combining the blasting parameters, empirical formulas, and theoretical calculations to determine the composition and pressure of the harmful gases generated after the pre-splitting blast of steeply inclined extra-thick coal seams, and fixing the gas collection device at the orifice of the blasting hole; S3: selecting an extraction system based on the amount of harmful gases generated after the blast, and discharging the harmful gases collected by the gas collection device through the extraction system; S4: comparing the composition and content of the harmful gases generated after the blast with the gas drawn into the extraction system to verify the extraction effect of the extraction system.

[0006] Furthermore, S3 includes: the pumping capacity of the pumping system is greater than the amount of harmful gas generated after the blast; the intake of the pumping system is connected to the gas collection device, and the outlet of the pumping system is connected to the return airway of the steeply inclined extra-thick coal seam, so that the harmful gas collected by the gas collection device is discharged to the return airway through the pumping system.

[0007] Furthermore, the extraction system includes a main intake pipeline, an extraction pump, a gas-liquid separator, and an exhaust pipeline. The intake port of the gas collection device is connected to the orifice of the blast hole. One end of the main intake pipeline is connected to the exhaust port of the gas collection device. The other end of the main intake pipeline is connected to the inlet of the extraction pump. The outlet of the extraction pump is connected to the inlet of the gas-liquid separator. The outlet of the gas-liquid separator is connected to one end of the exhaust pipeline. The other end of the exhaust pipeline is connected to the return airway.

[0008] The harmful gases collected by the gas collection device are transported to the gas-liquid separator by the exhaust pump, and the gas-liquid separator discharges the separated harmful gases to the return airway.

[0009] Furthermore, the gas collection device includes a collection structure, which includes a collection pipeline, a collection hose, and a borehole fixation device. The two ends of the collection hose are connected to the collection pipeline and the borehole fixation device, respectively. The borehole fixation device is fixed on the inner wall of the roadway and is connected to the opening of the blast hole. The collection pipeline is connected to one end of the suction main pipeline.

[0010] Furthermore, there are multiple acquisition structures, multiple blasting holes, multiple blasting holes are set at intervals, multiple acquisition pipelines are connected in sequence, and multiple drill fixing devices and the openings of multiple blasting holes are set one-to-one.

[0011] Furthermore, the borehole fixing device includes a fixing ring, a connecting pipe, and a connecting ring connected in sequence. The fixing ring is fixed to the inner wall of the roadway and communicates with the opening of the blast hole. The connecting ring is connected to one end of the collection hose.

[0012] Furthermore, the main suction pipeline includes a first section, a second section, and a third section. The second section is a tapered section. The end of the tapered section with a smaller diameter is connected to one end of the first section, and the end of the tapered section with a larger diameter is connected to the third section. The other end of the first section is connected to the outlet of the gas collection device, and the other end of the third section is connected to the inlet of the pump.

[0013] Furthermore, the pump includes a pump body and a drive motor, the drive motor and the pump body are connected in a drive connection, the other end of the suction main pipeline is connected to the inlet of the pump body, the outlet of the pump body is connected to the inlet of the gas-water separator, the diameter of the collection hose is 45cm-55cm, and the diameter of the discharge pipeline is 106cm-110cm.

[0014] Furthermore, S2 also includes: using anchor bolts to fix the gas collection device to the opening of the blast hole, with the gas collection device covering the opening of the blast hole.

[0015] Furthermore, S1 includes: obtaining reasonable blasting parameters based on the actual pre-splitting top coal demand of the horizontally segmented fully mechanized longwall face of steeply inclined extra-thick coal seams, and in combination with the calculation results of the influence range of blasting stress wave disturbance.

[0016] The present invention provides a method for collecting gases from the pre-splitting blast of steeply inclined extra-thick coal seams, comprising: S1: calculating the blasting parameters for the pre-splitting blast of steeply inclined extra-thick coal seams and determining the construction location of the blasting holes; S2: combining the blasting parameters, empirical formulas, and theoretical calculations to determine the composition and pressure of the harmful gases generated after the pre-splitting blast of steeply inclined extra-thick coal seams, and fixing the gas collection device at the opening of the blasting hole; S3: selecting an extraction system based on the content of harmful gases generated after blasting, and discharging the harmful gases collected by the gas collection device through the extraction system;

[0017] S4: Compare the composition and content of harmful gases generated after blasting with the gas inhaled into the extraction system to verify the extraction effect of the system. This method can intercept harmful gases generated by pre-splitting blasting at the source, reducing the risk of excessive gas levels at the working face and minimizing the waiting time for discharging these gases. It significantly helps prevent injuries caused by excessive harmful gases after mine blasting. First, the blasting parameters for pre-splitting blasting of steeply inclined, extra-thick coal seams are calculated, and the construction locations of the blast holes are determined. This provides technical support for subsequent precision blasting. Through rationally designed blasting parameters, combined with empirical formulas and theoretical calculations, the composition and pressure of harmful gases generated after pre-splitting blasting of steeply inclined, extra-thick coal seams are determined. Then, based on the content of harmful gases generated after blasting, an extraction system is selected. Subsequently, the harmful gases collected by the gas collection device are discharged through the extraction system. Finally, the extraction effect of the system is evaluated by comparing the detected composition and content of harmful gases after blasting with the gas drawn into the extraction system, thereby verifying the practicality of the gas collection method for pre-splitting blasting of steeply inclined, extra-thick coal seams designed in this scheme. This collection method solves the problem in existing technologies that do not address the emission of harmful gases generated after pre-splitting blasting. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A flowchart is shown of a method for collecting pre-fracture blasting gas in steeply inclined extra-thick coal seams according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the blasting hole construction location provided in an embodiment of the present invention is shown;

[0021] Figure 3 An assembly schematic diagram of the extraction system and gas collection device provided in an embodiment of the present invention is shown;

[0022] Figure 4 It shows Figure 3 A schematic diagram of the gas collection device;

[0023] Figure 5 It shows Figure 4 A schematic diagram of the structure of the borehole fixing device.

[0024] The above figures include the following reference numerals:

[0025] 10. Blasting holes;

[0026] 20. Gas sampling device; 21. Sampling structure; 211. Sampling pipeline; 212. Sampling hose; 213. Drilling fixture; 2131. Fixing ring; 2132. Connecting pipe; 2133. Connecting ring;

[0027] 30. Pumping system; 31. Suction main pipeline; 311. First pipeline section; 312. Second pipeline section; 313. Third pipeline section; 32. Pumping pump; 321. Pump body; 322. Drive motor; 33. Gas-liquid separator; 34. Discharge pipeline;

[0028] 41. Goaf; 42. Protected coal seam; 43. Height of fully mechanized mining face; 44. Roadway. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 5 As shown, an embodiment of the present invention provides a method for collecting pre-fracturing blasting gas in steeply inclined, extra-thick coal seams, comprising:

[0031] S1: Calculate the blasting parameters for the advanced pre-splitting blasting of steeply inclined extra-thick coal seams and determine the construction location of blasting hole 10;

[0032] S2: Combine blasting parameters, empirical formulas and theoretical calculations to determine the composition and pressure of harmful gases generated after the pre-splitting blasting of steeply inclined extra-thick coal seams, and fix the gas collection device 20 at the opening of the blasting hole 10.

[0033] S3: Select the appropriate extraction system 30 based on the amount of harmful gases produced after the blast, and use the extraction system 30 to discharge the harmful gases collected by the gas collection device 20.

[0034] S4: Compare the composition and content of the harmful gases produced after the explosion with the gases inhaled into the extraction system 30 to verify the extraction effect of the extraction system 30.

[0035] This approach can intercept harmful gases generated by pre-splitting blasting at the source, reducing the risk of excessive gas levels at the working face and minimizing the waiting time for the release of harmful gases. It also significantly helps to prevent injuries caused by excessive harmful gases generated after mine blasting. This scheme first calculates the blasting parameters for the pre-splitting blasting of steeply inclined extra-thick coal seams and determines the construction location of blasting holes 10. This provides technical support for subsequent precision blasting. Through rationally designed blasting parameters, combined with empirical formulas and theoretical calculations, the composition and pressure of harmful gases generated after the pre-splitting blasting of steeply inclined extra-thick coal seams are determined. Then, based on the content of harmful gases generated after blasting, the extraction system 30 is selected. Subsequently, the harmful gases collected by the gas collection device 20 are discharged through the extraction system 30. Finally, the extraction effect of the extraction system 30 is tested by comparing the detected composition and content of harmful gases after blasting with the gas drawn into the extraction system 30, thereby verifying the practicality of the gas collection method for pre-splitting blasting of steeply inclined extra-thick coal seams designed in this scheme. The collection method of this scheme solves the problem in existing technologies that do not address the discharge of harmful gases generated after pre-splitting blasting.

[0036] It should be noted that the components of the harmful gases produced after the blast are as follows: the largest quantities produced are N2, H2O, and CO2. Among these, the main toxic and harmful gases in the blasting fumes are CO and NO. x In addition to the gases (such as NO and NO2), it also contains small amounts of sulfides (such as SO2 and H2S), NH3 and other toxic and harmful gases, as well as H2, CH4 and trace amounts of C2H4. The blasting at the working face produces a large amount of carbon monoxide and nitrogen oxides. Blasting hole 10 is located on the inner wall of the roadway.

[0037] S3 includes: the pumping capacity of the pumping system 30 is greater than the amount of harmful gas generated after the blast; the inlet of the pumping system 30 is connected to the gas collection device 20, and the outlet of the pumping system 30 is connected to the return airway of the steeply inclined extra-thick coal seam; the harmful gas collected by the gas collection device 20 is discharged to the return airway through the pumping system 30.

[0038] The extraction capacity of the extraction system 30 is set to be greater than the amount of harmful gases produced after the blast. This ensures that the harmful gases are discharged in a timely manner, preventing them from lingering for too long and causing harm to the human body. The extraction system 30 can also promptly discharge the harmful gases collected by the gas collection device 20 into the return airway.

[0039] In this embodiment, the extraction system 30 includes an intake main pipeline 31, an extraction pump 32, a gas-liquid separator 33, and an exhaust pipeline 34. The intake port of the collection hose 212 and the gas collection device 20 are connected to the opening of the blast hole 10 on the inner wall of the tunnel. One end of the intake main pipeline 31 is connected to the outlet of the gas collection device 20, and the other end of the intake main pipeline 31 is connected to the inlet of the extraction pump 32. The outlet of the extraction pump 32 is connected to the inlet of the gas-liquid separator 33. The outlet of the gas-liquid separator 33 is connected to one end of the exhaust pipeline 34, and the other end of the exhaust pipeline 34 is connected to the return airway.

[0040] The harmful gas collected by the gas collection device 20 is transported to the gas-water separator 33 by the pump 32, and the gas-water separator 33 discharges the separated harmful gas to the return airway.

[0041] Using the above setup, the harmful gas collected by the gas collection device 20 is transported to the gas-water separator 33 by the exhaust pump 32, and the harmful gas is discharged to the return airway through the separation action of the gas-water separator 33.

[0042] Furthermore, the gas collection device 20 includes a collection structure 21, which includes a collection pipeline 211, a collection hose 212, and a borehole fixation device 213. Both ends of the collection hose 212 are connected to the collection pipeline 211 and the borehole fixation device 213, respectively. The borehole fixation device 213 is fixed to the inner wall of the tunnel 44 and connected to the opening of the blast hole 10. The collection pipeline 211 is connected to one end of the intake main pipeline 31. The borehole fixation device 213 is installed to fix the gas to the inner wall of the tunnel 44 and to connect it to the opening of the blast hole 10, preventing leakage of harmful gases after the blast. The harmful gases are then transported to the intake main pipeline 31 through the collection hose 212 and the collection pipeline 211.

[0043] like Figure 2As shown, this method primarily involves constructing pre-splitting blasting holes along the dip direction within the working face roadway 44, 30m away from the coal face of the fully mechanized top-coal caving face. Mine-approved explosives are then loaded into these holes and blasted. Ultimately, based on the internal dynamic principle of the explosives, the detonation gases generated during the explosion within the coal seam cause the coal to fracture and loosen, fully breaking it up to increase the ventability of the top coal and simultaneously reducing stress concentration in the top coal at the height 43 of the fully mechanized working face. The blasting holes 10 can be located within the protective coal seam 42, and the goaf 41 is situated above the protective coal seam 42.

[0044] The system comprises multiple collection structures 21, multiple blasting holes 10, and multiple blasting holes 10 spaced apart. Multiple collection pipelines 211 are connected sequentially, and multiple borehole holders 213 are correspondingly positioned with the openings of the multiple blasting holes 10. This one-to-one correspondence between the borehole holders 213 and the openings of the multiple blasting holes 10 enhances the absorption of harmful gases after blasting and improves the extraction efficiency of the extraction system 30.

[0045] In this embodiment, the borehole fixing device 213 includes a fixing ring 2131, a connecting pipe 2132, and a connecting ring 2133 connected in sequence. The fixing ring 2131 is fixed to the inner wall of the tunnel 44 and communicates with the opening of the blast hole 10. The connecting ring 2133 is communicated with one end of the collection hose 212. The fixing ring 2131 is provided to facilitate connection with the inner wall of the tunnel 44; the connecting ring 2133 is provided to facilitate connection with the collection hose 212.

[0046] Specifically, such as Figure 3 As shown, the main suction pipeline 31 includes a first pipe section 311, a second pipe section 312, and a third pipe section 313. The second pipe section 312 is a tapered pipe section. The end of the tapered pipe section with a smaller diameter is connected to one end of the first pipe section 311, and the end of the tapered pipe section with a larger diameter is connected to the third pipe section 313. The other end of the first pipe section 311 is connected to the outlet of the gas collection device 20, and the other end of the third pipe section 313 is connected to the inlet of the pump 32. By setting the second pipe section 312 as a tapered pipe section, the suction capacity of the main suction pipeline 31 is increased. At the same time, the first pipe section 311 is set to facilitate connection with the outlet of the gas collection device 20, and the diameter of the first pipe section 311 matches the diameter of the outlet of the gas collection device 20.

[0047] In this embodiment, the pump 32 includes a pump body 321 and a drive motor 322. The drive motor 322 and the pump body 321 are connected in a driving manner. The other end of the suction main pipeline 31 is connected to the inlet of the pump body 321, and the outlet of the pump body 321 is connected to the inlet of the gas-liquid separator 33. The diameter of the collection hose 212 is 45cm-55cm, and the diameter of the discharge pipeline 34 is 106cm-110cm. The drive motor 322 is provided to facilitate the operation of the pump body 321; the pump body 321 transports the harmful gas to the gas-liquid separator 33. Setting the diameter of the collection hose 212 to 45cm-55cm and the diameter of the discharge pipeline 34 to 106cm-110cm allows for adjustment based on the actual amount of harmful gas generated.

[0048] Specifically, S2 also includes: fixing the gas collection device 20 to the opening of the blast hole 10 in the inner wall of the roadway using anchor bolts, with the gas collection device 20 covering the opening of the blast hole 10. Using anchor bolts facilitates the installation and fixing of the gas collection device 20 to the opening of the coal wall blast hole 10, and the gas collection device 20 needs to completely cover the opening of the blast hole 10 to prevent leakage of harmful gases.

[0049] In this embodiment, S1 includes: deriving reasonable blasting parameters based on the actual pre-splitting top coal requirements of the horizontally segmented fully mechanized longwall face with steeply dipping extra-thick coal seams, and in conjunction with the calculation results of the influence range of blasting stress wave disturbance. This provides technical support for subsequent precision blasting.

[0050] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0052] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0053] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0054] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for collecting gas in advance of pre-splitting blasting in an ultra-thick coal seam with a steep inclination, characterized in that, include: S1: Calculate the blasting parameters for the pre-splitting blasting of steeply inclined extra-thick coal seams and determine the construction location of the blasting hole (10); S2: Combine the blasting parameters, empirical formulas and theoretical calculations to determine the composition and pressure of harmful gases generated after the pre-splitting blasting of steeply inclined extra-thick coal seams, and fix the gas collection device (20) at the opening of the blasting hole (10); S3: Select an extraction system (30) based on the amount of harmful gas generated after the blast, and discharge the harmful gas collected by the gas collection device (20) through the extraction system (30); S4: Compare the composition of the harmful gas produced after the explosion with the gas inhaled into the extraction system (30) to test the extraction effect of the extraction system (30); The extraction capacity of the extraction system (30) is greater than the amount of harmful gas generated after the blast; the intake of the extraction system (30) is connected to the gas collection device (20), and the outlet of the extraction system (30) is connected to the return airway of the steeply inclined extra-thick coal seam. The harmful gas collected by the gas collection device (20) is discharged to the return airway through the extraction system (30). The extraction system (30) includes an intake main pipeline (31), an extraction pump (32), a gas-water separator (33), and an exhaust pipeline (34). The intake port of the gas collection device (20) is connected to the orifice of the blast hole (10). One end of the intake main pipeline (31) is connected to the exhaust port of the gas collection device (20), and the other end of the intake main pipeline (31) is connected to the inlet of the extraction pump (32). The outlet of the extraction pump (32) is connected to the inlet of the gas-water separator (33), and the outlet of the gas-water separator (33) is connected to one end of the exhaust pipeline (34). The other end of the exhaust pipeline (34) is connected to the return airway. The harmful gas collected by the gas collection device (20) is transported to the gas-water separator (33) by the extraction pump (32), and the gas-water separator (33) discharges the separated harmful gas to the return airway. The gas collection device (20) includes a collection structure (21), which includes a collection pipeline (211), a collection hose (212), and a borehole fixation device (213). The two ends of the collection hose (212) are connected to the collection pipeline (211) and the borehole fixation device (213) respectively. The borehole fixation device (213) is fixed on the inner wall of the tunnel (44) and connected to the opening of the blast hole (10). The collection pipeline (211) is connected to one end of the suction main pipeline (31). The borehole fixing device (213) includes a fixing ring (2131), a connecting pipe (2132) and a connecting ring (2133) connected in sequence. The fixing ring (2131) is fixed on the inner wall of the roadway (44) and communicates with the opening of the blast hole (10). The connecting ring (2133) is connected to one end of the collection tube (212).

2. The method for collecting pre-fracture blasting gas in steeply inclined extra-thick coal seams according to claim 1, characterized in that, The collection structure (21) is multiple, the blasting hole (10) is multiple, the multiple blasting holes (10) are spaced apart, the multiple collection pipelines (211) are connected in sequence, and the openings of the multiple drilling fixtures (213) and the multiple blasting holes (10) are set one-to-one.

3. The method for collecting pre-fracturing blasting gas in steeply inclined extra-thick coal seams according to claim 1, characterized in that, The main intake pipeline (31) includes a first pipe section (311), a second pipe section (312), and a third pipe section (313). The second pipe section (312) is a tapered pipe section. The smaller diameter end of the tapered pipe section is connected to one end of the first pipe section (311), and the larger diameter end of the tapered pipe section is connected to the third pipe section (313). The other end of the first pipe section (311) is connected to the outlet of the gas collection device (20), and the other end of the third pipe section (313) is connected to the inlet of the pump (32).

4. The method for collecting pre-fracturing blasting gas in steeply inclined extra-thick coal seams according to claim 1, characterized in that, The pump (32) includes a pump body (321) and a drive motor (322). The drive motor (322) and the pump body (321) are connected in a drive connection. The other end of the suction main pipeline (31) is connected to the inlet of the pump body (321), and the outlet of the pump body (321) is connected to the inlet of the gas-water separator (33).

5. The method for collecting pre-fracture blasting gas in steeply inclined extra-thick coal seams according to claim 1, characterized in that, S2 also includes: The gas collection device (20) is fixed to the opening of the blast hole (10) using an anchor bolt, and the gas collection device (20) covers the opening of the blast hole (10).

6. The method for collecting pre-fracturing blasting gas in steeply inclined extra-thick coal seams according to claim 1, characterized in that, S1 includes: Based on the actual pre-splitting top coal requirements of the horizontally segmented fully mechanized longwall face of steeply inclined extra-thick coal seams, and combined with the calculation results of the influence range of blasting stress wave disturbance, reasonable blasting parameters are obtained.

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