Rescue apparatus and rescue method for underground coal mine roadway collapse accidents

Abstract

A rescue apparatus and a rescue method for underground coal mine roadway collapse accidents. The rescue apparatus comprises a directional drilling mechanism (1), a transmission linkage mechanism (2), and a rescue access mechanism (3); the rescue method comprises the following steps: detecting a slope gradient of a collapsed accumulation body (4), and determining an initial drilling angle (S1); a central guide drill (1-1) drilling along a slope of the collapsed accumulation body (4) (S2); performing real-time detection with an electromagnetic ranging radar (1-5), and adjusting a drilling angle to near-horizontal when there is a significant difference in an electrical property of a signal (S3); the central guide drill (1-1) continuing to drill along the collapsed accumulation body (4), and when the electromagnetic ranging radar (1-5) detects a significant difference in the electrical property of the signal, adjusting the drilling angle to an inclination direction opposite to the initial drilling angle (S4); enlarging a borehole diameter with a reaming drill (1-3), inserting an air-ribbed inflatable membrane conduit (3-1) into the enlarged borehole, and performing spraying with a thin-film spraying assembly (1-4) (S5); the directional drilling mechanism (1) bypassing the collapsed accumulation body (4) to reach a rescue location (8), the thin-film spraying assembly (1-4) ceasing spraying, and the air-ribbed inflatable membrane conduit (3-1) being inflatably deployed (S6); and trapped personnel being evacuated by means of an interior of the air-ribbed inflatable membrane conduit (3-1) (S7). The present invention improves rescue efficiency and success rates in relation to underground coal mine roadway collapse accidents.

Description

A rescue device and method for underground roadway collapse accidents in coal mines. Technical Field

[0001] This invention relates to a rescue device and method for underground roadway collapse accidents in coal mines, belonging to the field of underground drilling and rescue technology in coal mines. Background Technology

[0002] Coal mine geological and dynamic disasters often cause the collapse of the tunnel excavation space. Existing rescue methods often use manpower or excavators to directly clear the collapsed pile (or excavate the collapsed pile from all directions and over a large area), while providing timely support for the excavated space. However, they do not consider the spatial structure above the collapsed pile, or open a new rescue channel to bypass the collapse accident area. This results in a huge amount of work, takes a long time, and makes it difficult to complete the rescue within the golden time, causing great loss of life and property. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a rescue device and method for underground roadway collapse accidents in coal mines. This rescue device and method are beneficial for carrying out rescue work after roadway collapse, improving rescue efficiency and success rate, and reducing loss of life and property.

[0004] To achieve the above objectives, the present invention provides a rescue device for underground roadway collapse accidents in coal mines, comprising a guiding drilling mechanism, a transmission connection mechanism, and a rescue channel mechanism;

[0005] The directional drilling mechanism includes a central directional drill, a drill rod, a reamer, and a thin-film spraying assembly. An electromagnetic ranging radar is installed on the central directional drill, which is capable of transmitting and receiving electromagnetic wave signals while drilling, and determining the interface between the collapsed accumulation body and the naturally collapsed arch structure where there is a significant electrical difference. The reamer is connected to the central directional drill via the drill rod. The reamer has a larger diameter than the central directional drill, and multiple reamer cutters are evenly spaced along its outer circumference. Multiple thin-film spraying assemblies are installed between adjacent reamer cutters.

[0006] The transmission connection mechanism includes a transmission link and a ball joint structure. The ball joint structure includes a housing support, a cage between the housing support and the inner raceway, and multiple transmission steel balls installed in the cage. The transmission steel balls roll in cooperation with the housing support and the inner raceway. One end of the transmission link is connected to the reamer, and the other end is connected to the inner raceway.

[0007] The rescue channel mechanism includes an air-ribbed inflatable membrane pipe, one end of which is connected to a guide drilling mechanism via a transmission connection mechanism. The air-ribbed inflatable membrane pipe is provided with a liquid supply passage and an air supply passage, both of which pass through the transmission connection mechanism and the guide drilling mechanism, and are used to provide spraying slurry and air to the thin film spraying component and the air-ribbed inflatable membrane pipe, respectively.

[0008] Furthermore, the air-ribbed inflatable membrane pipe is provided with flexible reinforcing ribs, which are attached to the surface of the air-ribbed inflatable membrane pipe.

[0009] Furthermore, the thin film spraying assembly includes a mounting base, a support frame, a pressurizing chamber, a liquid inlet pipe, and a spray head; the mounting base is fixed on the reamer body, and the support frame is provided on the mounting base. The pressurizing chamber and the liquid inlet pipe are sealed and installed in the support frame. The spray head is installed on the exposed part at the top of the support frame. The pressurizing chamber is used to connect the spray head and one end of the liquid inlet pipe, and the other end of the liquid inlet pipe is connected to the liquid supply passage.

[0010] A rescue method for a rescue device used in underground coal mine roadway collapse accidents includes the following steps:

[0011] S1. Use a slope meter to detect the inclination slope of the collapsed debris, and determine the initial drilling angle of the center directional drill based on the measurement results;

[0012] S2. Install the directional drilling mechanism, transmission connection mechanism and rescue channel mechanism in sequence from front to back, and start the central directional drill to drill along the slope of the collapsed accumulation body at the initial drilling angle determined in S1.

[0013] S3. During the drilling process, the electromagnetic ranging radar transmits electromagnetic wave signals to the drilling front in real time and receives reflected signals. When the central guide drill approaches the first inflection point of the collapsed accumulation, and the electromagnetic ranging radar detects that the reflected signal has a significant electrical difference, the central guide drill adjusts its drilling angle to near horizontal.

[0014] S4. The center directional drill continues to drill along the upper horizontal section of the collapsed accumulation body to near the second inflection point. When the electromagnetic ranging radar detects a significant electrical difference in the reflected signal again, the center directional drill adjusts its drilling angle to the reverse angle of the initial drilling angle. That is, the drilling trajectory continues to drill along the boundary between the collapsed arch and the accumulation body.

[0015] S5. Under the traction of the central guide drill, the reamer enters the pre-drilled hole along the same trajectory. Through the rotation and feeding action of the reamer, the reamer cutter continuously cuts and gradually enlarges the hole diameter. The air-ribbed inflatable membrane pipe then enters the enlarged hole diameter. At the same time, the thin film spraying component sprays the collapsed accumulation in the drilling space and the surface of the collapsed arch above the accumulation to form a sprayed flexible film with temporary support function.

[0016] S6. After the directional drilling mechanism bypasses the collapsed debris and arrives at the rescue location, the film spraying component stops spraying, and the air-ribbed inflatable membrane pipe is inflated and deployed through the air supply channel. The flexible reinforcing ribs and the air-ribbed inflatable membrane pipe are gradually and tightly attached.

[0017] S7. Remove the guide drilling mechanism and transmission connection mechanism, and the trapped personnel can be evacuated from inside the load-bearing air-ribbed inflatable membrane pipe.

[0018] Furthermore, the reaming drill enlarges the hole diameter to no less than 600 mm; the sprayed flexible film formed by the thin-film spraying assembly has a tensile strength of no less than 30 MPa, a thickness of no less than 5 mm, and an initial setting time of no more than 60 seconds. This invention utilizes the unique spatial characteristics formed above the collapsed accumulation body to perform high-level directional drilling, thereby bypassing the collapsed accumulation body and reducing the amount of tunneling work. The thin-film spraying assembly can provide comprehensive temporary support for the rescue space before the construction of the rescue passage. The rescue passage section adopts an air-ribbed inflatable membrane pipeline structure, enabling the rapid formation of a rescue passage after drilling is completed in the rescue space. By utilizing the unique high-level spatial characteristics of the collapsed accumulation body, a rescue passage is formed above the collapsed accumulation body, thus bypassing the collapsed area. This significantly reduces the operation time for opening passages in broken rock, reduces the amount of engineering work in the support stage, and has the advantages of flexible and reliable passages, efficient and rapid construction, and simplified support procedures. It is beneficial for carrying out rescue work after a roadway collapse, improving rescue efficiency and success rate, and reducing loss of life and property. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the structure of the present invention;

[0020] Figure 2 is a schematic diagram of the guiding drilling mechanism in this invention;

[0021] Figure 3 is a schematic diagram of the thin film spraying assembly in this invention;

[0022] Figure 4 is a schematic diagram of the transmission connection mechanism in this invention;

[0023] Figure 5 is a schematic diagram of the cooperative structure of the rescue channel mechanism and the transmission connection mechanism in this invention;

[0024] Figure 6 is a structural schematic diagram of the rescue channel mechanism in this invention;

[0025] Figure 7 is a flowchart of the process of the method of the present invention.

[0026] In the diagram: 1. Guided drilling mechanism, 1-1. Central guide drill, 1-2. Drill rod, 1-3. Reamer, 1-4. Thin film spraying assembly, 1-41. Mounting base, 1-42. Support frame, 1-43. Pressurization chamber, 1-44. Liquid inlet pipe, 1-45. Spray head; 1-5. Electromagnetic ranging radar, 1-6. Reamer; 2. Transmission connection mechanism, 2-1. Transmission connecting rod, 2-2. Outer shell support, 2-3. Inner raceway, 2-4. Cage, 2-5. Transmission steel ball; 3. Rescue channel mechanism, 3-1. Air-ribbed inflatable membrane pipe, 3-11. Liquid supply passage, 3-12. Air supply passage, 3-13. Flexible reinforcing rib; 4. Collapsed accumulation body, 5. Natural collapse arch structure, 6. First inflection point, 7. Second inflection point, 8. Rescue position. Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] As shown in Figure 1, a rescue device for underground roadway collapse accidents in coal mines includes a guiding drilling mechanism 1, a transmission connection mechanism 2, and a rescue channel mechanism 3.

[0029] As shown in Figures 1 and 2, the guiding drilling mechanism 1 includes a central guiding drill 1-1, a drill rod 1-2, a reaming drill 1-3, and a thin film spraying assembly 1-4. An electromagnetic ranging radar 1-5 is installed on the central guiding drill 1-1, which has the function of transmitting and receiving electromagnetic wave signals while drilling, and measuring the interface between the collapsed accumulation body 4 and the naturally collapsed arch structure 5 where there is a significant electrical difference. Its principle is the electromagnetic wave reflection ranging principle. When electromagnetic waves encounter an interface with an electrical difference during propagation in the medium, the electromagnetic waves will be reflected. The reflected waves will be received by the radar. By analyzing the waveform and amplitude intensity changes of the received electromagnetic waves, the distance between the radar location and the boundary surface can be obtained. The collapsed accumulation body 4 has broken rock blocks with large gaps, while the naturally collapsed arch structure 5 has relatively complete and dense surrounding rock. There is a significant density difference between the two at the interface, and the propagation and reflection signals of electromagnetic waves will also be significantly different. The reaming drill 1-3 is connected to the central guide drill 1-1 through the drill rod 1-2. The diameter of the reaming drill 1-3 is larger than that of the central guide drill 1-1. Multiple reaming cutters 1-6 are evenly spaced along its outer circumference. Multiple thin film spraying components 1-4 are installed between adjacent reaming cutters 1-6.

[0030] As shown in Figure 3, the thin-film spraying assembly 1-4 includes a mounting base 1-41, a support frame 1-42, a pressurizing chamber 1-43, a liquid inlet pipe 1-44, and a spray head 1-45. The mounting base 1-41 is fixed on the body of the reamer 1-3. The support frame 1-42 is provided on the mounting base 1-41. The pressurizing chamber 1-43 and the liquid inlet pipe 1-44 are sealed and installed in the support frame 1-42. The spray head 1-45 is installed on the exposed part of the top of the support frame 1-42. The pressurizing chamber 1-43 is used to connect the spray head 1-45 and one end of the liquid inlet pipe 1-44. The other end of the liquid inlet pipe 1-44 is connected to the liquid supply passage 3-11. The function of the pressurizing chamber 1-43 is to increase the pressure of the spraying liquid, ensure that the spraying liquid is sprayed out at a higher speed, and enhance the spraying coverage.

[0031] As shown in Figure 4, the transmission connection mechanism 2 includes a transmission link 2-1 and a ball joint structure. The ball joint structure includes a housing support 2-2, and a retainer 2-4 between the housing support 2-2 and the inner raceway 2-3. Multiple transmission steel balls 2-5 are installed in the retainer 2-4. The transmission steel balls 2-5 roll with the housing support 2-2 and the inner raceway 2-3. One end of the transmission link 2-1 is connected to the reamer 1-3, and the other end is connected to the inner raceway 2-3.

[0032] As shown in Figures 2 to 6, the rescue channel mechanism 3 includes an air-ribbed inflatable membrane pipe 3-1. One end of the air-ribbed inflatable membrane pipe 3-1 is connected to the guide drilling mechanism 1 through a transmission connection mechanism 2. The air-ribbed inflatable membrane pipe 3-1 is provided with a liquid supply passage 3-11 and an air supply passage 3-12. The liquid supply passage 3-11 and the air supply passage 3-12 both pass through the transmission connection mechanism 2 and the guide drilling mechanism 1, and are used to provide spraying slurry and air to the thin film spraying assembly 1-4 and the air-ribbed inflatable membrane pipe 3-1, respectively.

[0033] In order to further improve the load-bearing strength of the air-ribbed inflatable membrane pipe 3-1, the air-ribbed inflatable membrane pipe 3-1 is provided with flexible reinforcing ribs 3-13, which are attached to the surface of the air-ribbed inflatable membrane pipe 3-1.

[0034] As shown in Figure 7, a rescue method for a rescue device used in underground coal mine roadway collapse accidents includes the following steps:

[0035] S1. Use a slope meter to detect the inclination slope of the collapsed accumulation body 4, and determine the initial drilling angle of the center guide drill based on the measurement results;

[0036] S2. Install the directional drilling mechanism 1, the transmission connection mechanism 2 and the rescue channel mechanism 3 in sequence from front to back, and start the central directional drill 1-1 to drill along the slope of the collapsed pile body 4 at the initial drilling angle determined in S1.

[0037] S3. Under the traction of the central guide drill, the reamer 1-3 enters the pre-drilled hole along the same trajectory. Through the rotation and feeding action of the reamer 1-3, the reamer cutter 1-6 continuously cuts and gradually enlarges the hole diameter. The air-ribbed inflatable membrane pipe 3-1 then enters the enlarged hole diameter. At the same time, the thin film spraying assembly 1-4 sprays the surface of the collapsed accumulation body 4 in the drilling space and the collapse arch structure 5 above the accumulation body to form a sprayed flexible film with temporary support function.

[0038] S4. Electromagnetic ranging radar 1-5 transmits electromagnetic wave signals to the drilling front in real time and receives reflected signals during the drilling process. When the center guide drill 1-1 approaches the first inflection point 6 of the collapsed accumulation body 4, and the electromagnetic ranging radar 1-5 detects that the reflected signal has obvious electrical differences, the center guide drill 1-1 adjusts the drilling angle to near horizontal.

[0039] S5. When the center directional drill 1-1 continues to drill along the upper horizontal section of the collapsed accumulation body 4 to near the second inflection point 7, and the electromagnetic ranging radar 1-5 detects a significant electrical difference in the reflected signal again, the center directional drill 1-1 automatically adjusts the drilling angle back to the initial drilling angle.

[0040] S6. After the directional drilling mechanism 1 bypasses the collapsed debris 4 and arrives at the rescue position 8, the film spraying component 1-4 stops spraying, and the air-ribbed inflatable membrane pipe 3-1 is inflated and deployed through the air supply passage 3-12. The flexible reinforcing rib 3-13 gradually fits tightly with the air-ribbed inflatable membrane pipe 3-1.

[0041] S7. Remove the guide drilling mechanism 1 and the transmission connection mechanism 2, and the trapped personnel can be evacuated from inside the load-bearing air-ribbed inflatable membrane pipe 3-1.

[0042] As shown in Figure 2, to ensure that personnel can pass through the rescue passage mechanism smoothly, the hole enlarging drill 1-3 enlarges the hole diameter to no less than 600 mm; to further ensure the safety of the rescue passage mechanism, the sprayed flexible film formed by the thin film spraying component 1-4 has a tensile strength of no less than 30 MPa, a thickness of no less than 5 mm, and an initial setting time of no more than 60 s.

Claims

1. A rescue device for underground roadway collapse accidents in coal mines, characterized in that, It includes a directional drilling mechanism (1), a transmission connection mechanism (2), and a rescue channel mechanism (3); The guiding drilling mechanism (1) includes a central guiding drill (1-1), a drill rod (1-2), a reamer (1-3), and a thin film spraying assembly (1-4); an electromagnetic ranging radar (1-5) is installed on the central guiding drill (1-1); the reamer (1-3) is connected to the central guiding drill (1-1) through the drill rod (1-2), the diameter of the reamer (1-3) is larger than that of the central guiding drill (1-1), and multiple reamers (1-6) are provided at equal intervals along the circumference of its outer wall, and multiple thin film spraying assemblies (1-4) are installed between adjacent reamers (1-6). The transmission connection mechanism (2) includes a transmission link (2-1) and a ball joint structure. The ball joint structure includes a housing support (2-2), a cage (2-4) between the housing support (2-2) and the inner raceway (2-3), and a plurality of transmission steel balls (2-5) are installed in the cage (2-4). The transmission steel balls (2-5) roll with the housing support (2-2) and the inner raceway (2-3). One end of the transmission link (2-1) is connected to the reamer (1-3), and the other end is connected to the inner raceway (2-3). The rescue channel mechanism (3) includes an air-ribbed inflatable membrane pipe (3-1), one end of which is connected to the guide drilling mechanism (1) through a transmission connection mechanism (2); the air-ribbed inflatable membrane pipe (3-1) is provided with a liquid supply passage (3-11) and an air supply passage (3-12), which both pass through the transmission connection mechanism (2) and the guide drilling mechanism (1), respectively, to provide spraying slurry and air to the thin film spraying assembly (1-4) and the air-ribbed inflatable membrane pipe (3-1).

2. The rescue device for underground roadway collapse accidents in coal mines according to claim 1, characterized in that, The air-ribbed inflatable membrane pipe (3-1) is provided with flexible reinforcing ribs (3-13), which are attached to the surface of the air-ribbed inflatable membrane pipe (3-1).

3. The rescue device for underground roadway collapse accidents in coal mines according to claim 1, characterized in that, The thin film spraying assembly (1-4) includes a mounting base (1-41), a support frame (1-42), a pressurizing chamber (1-43), a liquid inlet pipe (1-44), and a spray head (1-45). The mounting base (1-41) is fixed on the body of the reamer (1-3). The support frame (1-42) is provided on the mounting base (1-41). The pressurizing chamber (1-43) and the liquid inlet pipe (1-44) are sealed and installed in the support frame (1-42). The spray head (1-45) is installed on the exposed part of the top of the support frame (1-42). The pressurizing chamber (1-43) is used to connect the spray head (1-45) and one end of the liquid inlet pipe (1-44). The other end of the liquid inlet pipe (1-44) is connected to the liquid supply passage (3-11).

4. A rescue method using the rescue device for underground roadway collapse accidents in coal mines as described in claims 1 to 3, characterized in that, Includes the following steps: S1. Use a slope meter to detect the inclination slope of the collapsed accumulation body (4), and determine the initial drilling angle of the center guide drill (1-1) based on the measurement results; S2. Install the directional drilling mechanism (1), transmission connection mechanism (2) and rescue channel mechanism (3) from front to back in sequence, and start the central directional drill (1-1) to drill along the slope of the collapsed accumulation body (4) at the initial drilling angle determined in S1. S3. The electromagnetic ranging radar (1-5) transmits electromagnetic wave signals to the drilling front in real time and receives reflected signals during the drilling process. When the central guide drill (1-1) approaches the first inflection point (6) of the collapsed accumulation body (4), the electromagnetic ranging radar (1-5) detects that the reflected signal has obvious electrical differences, and the central guide drill (1-1) adjusts the drilling angle to near horizontal. S4. The center directional drill (1-1) continues to drill along the upper horizontal section of the collapsed accumulation body (4) until it approaches the second inflection point (7). When the electromagnetic ranging radar (1-5) detects a significant electrical difference in the reflected signal again, the center directional drill (1-1) automatically adjusts the drilling angle back to the initial drilling angle. S5. Under the traction of the central guide drill (1-1), the reamer (1-3) enters the pre-drilled hole along the same trajectory. Through the rotation and feeding action of the reamer (1-3), the reamer (1-6) continuously cuts and gradually enlarges the hole diameter. The air-ribbed inflatable membrane pipe (3-1) then enters the enlarged hole diameter. At the same time, the thin film spraying assembly (1-4) sprays the collapsed accumulation body (4) in the drilling space and the surface of the collapse arch above the accumulation body to form a sprayed flexible film with temporary support function. S6. After the directional drilling mechanism (1) bypasses the collapsed accumulation body (4) and arrives at the rescue position (8), the film spraying component (1-4) stops spraying, the air-ribbed inflatable membrane pipe (3-1) is inflated and unfolded through the air supply passage (3-12), and the flexible reinforcing rib (3-13) gradually fits tightly with the air-ribbed inflatable membrane pipe (3-1). S7. Remove the guide drilling mechanism (1) and the transmission connection mechanism (2), and the trapped personnel are evacuated from the inside of the load-bearing air-ribbed inflatable membrane pipe (3-1).

5. The rescue method for underground roadway collapse accidents in coal mines according to claim 4, characterized in that, The reamer (1-3) enlarges the hole diameter to not less than 600 mm; the sprayed flexible film formed by the thin film spraying assembly (1-4) has a tensile strength of not less than 30 MPa, a thickness of not less than 5 mm, and an initial setting time of not more than 60 s.

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