Pressure relief method and equipment for gob-side tunnel retaining

Abstract

The present application provides a method and equipment for unloading pressure in goaf-retained tunnels, including the following steps: S1. Drilling design: design the drilling position and size of the goaf-retained tunnels according to the shape and size of the tunnels, S2. Drilling construction: use drilling equipment to drill holes at the top of the tunnel to discharge the gas, S3. Formation of a pressure relief channel: after completing the drilling construction, clean up the rocks and coal bodies between the two tunnels to form a pressure relief channel that runs through the two tunnels, S4. Sealing treatment: after the pressure relief channel is formed, seal the borehole, S5. Safety measures: when performing pressure relief in goaf-retained tunnels, use protective plates to isolate the space below the borehole. The method of pressure relief in goaf-retained tunnels can not only reduce the pressure in the coal seam and reduce the possibility of coal and gas outbursts, thereby reducing the incidence of coal mine safety accidents, but also improve the permeability of the coal seam, which is conducive to mechanical mining and improves coal mining efficiency.

Description

Technical Field

[0001] The invention relates to the field of coal mining, and in particular to a method and equipment for unloading pressure in a gob-side tunnel retaining system. Background Art

[0002] In traditional coal mining, drilling and blasting or mechanical mining are usually used for coal mining. These methods often damage the coal seam and surrounding rock formations while mining, resulting in excessive gas pressure in the coal seam, which can easily lead to coal and gas outbursts and pose a threat to the lives and safety of miners.

[0003] For example, the Chinese invention patent (application number: CN201911245085.9) discloses a "technology for advanced top cutting and pressure relief along the goaf for high-gas, large-scale and efficient mining working faces". Its specification discloses: the amount of gas gushing out of the coal seam is large, and the use of automatic goaf formation technology by top cutting and collapse (i.e., the 110 method) makes it difficult to seal the goaf, and the gas concentration in the return air goaf is high, resulting in gas exceeding the limit and even gas explosion and other accident hazards. The above patents can prove the defects of the existing technology.

[0004] Therefore, we have made improvements and proposed a method and equipment for unloading pressure along the gob-side tunnel. Summary of the invention

[0005] The purpose of the present invention is to address the problem that the existing traditional mining methods often damage the coal seams and surrounding rock formations, resulting in excessive gas pressure in the coal seams, easily leading to coal and gas outbursts, and posing a threat to the lives and safety of miners.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention provides the following method and equipment for unloading pressure along the gob-side tunnel retaining to improve the above-mentioned problems.

[0007] The specific application is as follows:

[0008] The method for unloading pressure in gob-side entry retaining includes the following steps:

[0009] S1. Drilling design: Design the location and size of drilling holes along the gob according to the shape and size of the gob.

[0010] S2. Drilling construction: Use drilling equipment to drill holes on the top of the tunnel to allow gas to escape.

[0011] S3. Formation of pressure relief channel: After the drilling construction is completed, the rocks and coal bodies between the two tunnels are cleaned up to form a pressure relief channel running through the two tunnels.

[0012] S4. Sealing treatment: After the pressure relief channel is formed, the drilled hole is sealed.

[0013] S5. Safety measures: When carrying out pressure relief along the goaf, use protective plates to isolate the space below the borehole. The method of pressure relief along the goaf can not only reduce the pressure in the coal seam and reduce the possibility of coal and gas outbursts, thereby reducing the incidence of coal mine accidents, but also improve the permeability of the coal seam, which is conducive to mechanical mining and improves coal mining efficiency. It can also release gas and other harmful gases in the coal seam in advance, reducing harm to humans and the environment.

[0014] As a preferred technical solution of the present application, geological survey is conducted on the tunnel before drilling construction to obtain information on the physical properties and pressure conditions of the rock and coal body.

[0015] As a preferred technical solution of the present application, the drilling design includes determining the shape, size, depth and position of the drilling hole.

[0016] As a preferred technical solution of the present application, the drilling equipment monitors the drilling speed, pressure and temperature of the drilling rig during the construction process, and the oxygen content should be monitored synchronously when the temperature is monitored.

[0017] As a preferred technical solution of the present application, the pressure relief channel is reinforced and supported after it is formed to prevent the channel from deformation and damage.

[0018] As a preferred technical solution of the present application, the sealing treatment uses quick-setting cement to seal the drilled hole, and the quick-setting cement is quality controlled and inspected before the sealing process, and the sealing result is tested and evaluated for air tightness.

[0019] The pressure relief equipment for gob-side tunnel retaining comprises two first support plates, a support mechanism for supporting the mine road is arranged between the two first support plates, a moving mechanism is arranged on the first support plates, the moving mechanism comprises two first wheels respectively arranged in two rectangular grooves therein through bearings, a plurality of limit rods are arranged on one side circumference inside the first wheels, and the moving mechanism further comprises two second wheels respectively arranged in the other two rectangular grooves;

[0020] A pressure relief mechanism is provided between the two first support plates, and the pressure relief mechanism includes two rectangular blocks provided between the two first support plates, a rotating rod is provided between the two rectangular blocks through a bearing, and a first motor for driving the rotating rod to rotate is provided on one of the rectangular blocks. By providing the pressure relief mechanism, people can continue to drill holes and relieve pressure on the top of the mine tunnel by controlling the rotation of the drill bit, and when the drill bit is turned to different positions and cooperates with the moving mechanism or the supporting mechanism respectively, the movement and mobile support functions of the equipment can be realized respectively, and the functionality is strong;

[0021] A supporting mechanism is provided at the bottom of the first supporting plate, and the supporting mechanism includes four return frames respectively arranged at the bottom of the two first supporting plates, and a corrugated cover for collecting gravel is provided at the bottom of the return frame. By setting the supporting mechanism, the gravel generated during the drilling process can enter the return frame under the guidance of the second supporting plate. When the drill bit turns, the second electric push rod can rotate under the transmission of the first gear, the second gear, the second round rod, the third gear and the fourth gear, so as to support and lift the first supporting plate, and in the process of flipping the second electric push rod, the corrugated cover can be squeezed, so that the gravel in the corrugated cover can be easily moved to the return frame, which is convenient for people to take out. The supporting mechanism can not only be used for collecting gravel, but also can cooperate with the pressure relief mechanism for the mobile support of the first supporting plate and the supporting mechanism and the movement of the overall equipment, and has strong functionality.

[0022] As a preferred technical solution of the present application, the support mechanism includes two spring telescopic rods arranged between two first support plates, the rectangular block is installed on the spring telescopic rods, and two rectangular grooves are provided on the tops of the two first support plates, wherein the two rectangular grooves are provided with threaded cylinders, and the second support plates are fixedly connected on both sides of the threaded cylinders, and the tops of the threaded cylinders are fixedly connected with guide blocks. By setting up the support mechanism, when the drill bit turns to the first wheel, the second support plate can support the top of the mine tunnel, and under the action of the spring telescopic rods, it can cooperate with the comprehensive excavation machine to perform mobile support for the mine tunnel during the mine tunnel excavation process. When the drill bit is relieving pressure during drilling, the fallen gravel can be guided so that most of the gravel can fall into the return frame. The support mechanism can not only be used to guide the gravel in the drilling process, but also can cooperate with the rectangular slots and the comprehensive excavation machine to continue to support the mine tunnel after the drill bit turns, and has strong functionality.

[0023] As a preferred technical solution of the present application, two first bases are symmetrically arranged on the rotating rod, and a second base is arranged at the top of the first base through a bearing, and a second motor for driving the second base to rotate is fixedly installed at the bottom of the first base, and four drill bits are arranged on the top of the second base, and threads matching the threaded barrel are provided on the drill bits. By setting the first electric push rod, the cross groove and the connecting block, people can adjust the gap between the four drill bits and thus adjust the diameter of the drill hole by controlling the extension and retraction of the first electric push rod, and when the first electric push rod is contracted to the maximum, the steering of the drill bit can be adjusted by controlling the first motor so that the drill bit can be turned to the first wheel, and the limit rod can enter the gap between the four drill bits, and then when the four drill bits rotate, the first wheel can be driven to rotate, so that the entire equipment can be moved in the mine tunnel, and the pressure relief mechanism can not only be used for drilling pressure relief at the top of the mine tunnel, but also can be used in conjunction with the moving mechanism to control the movement of the entire equipment, and has strong functionality.

[0024] As a preferred technical solution of the present application, the supporting mechanism also includes two grooves respectively opened on both sides of the rectangular groove, a second electric push rod is provided on both sides of the bottom end of the first supporting plate, a first round rod is provided at the end of the second electric push rod, a first gear and a fixed block are provided at both ends of the first round rod, and the fixed block is fixed to the bottom of the first supporting plate, the first gear is connected to the second gear by a chain extending into the groove, the middle part of the second gear is fixedly connected to the second round rod rotatably connected to the inside of the groove, the end of the second round rod is fixedly connected to the third gear, and the third gear is connected to the fourth gear arranged on the rotating rod through a chain, and the rotating rod can drive the second electric push rod to rotate during the rotation process by arranging the first gear, the second gear, the second round rod, the third gear and the fourth gear. The rotating rod can drive the second electric push rod to rotate when rotating. The second electric push rod rotates to different directions to realize the support and lifting of the first supporting plate, and does not affect the movement of the first supporting plate. It can also assist the contraction of the corrugated cover to facilitate the removal of gravel in the corrugated cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the pressure relief method for gob-side entry retention provided in this application;

[0026] Figure 2 Schematic diagram of the pressure relief equipment for gob-side tunnel retention provided for this application;

[0027] Figure 3 A schematic diagram of the bottom structure of the first support plate of the gob-side tunnel retaining pressure relief equipment provided in this application;

[0028] Figure 4 A schematic diagram of the first support plate structure of the gob-side tunnel retaining pressure relief equipment provided in this application;

[0029] Figure 5 The pressure relief equipment for the gob retaining tunnel provided for this application Figure 2 The enlarged structural diagram at A in the middle;

[0030] Figure 6 A schematic diagram of the structure of the second electric push rod of the gob-side tunnel retaining pressure relief device provided in this application;

[0031] Figure 7 A schematic diagram of the structure of the second support plate of the gob-side tunnel retaining pressure relief equipment provided in this application;

[0032] Figure 8 A schematic diagram of the separation structure of the drill bit and the second base of the gob-side tunnel retaining pressure relief equipment provided in this application;

[0033] Fig. 9 A schematic diagram of the structure of the connection block and the first electric push rod of the gob-side tunnel retaining pressure relief device provided in this application;

[0034] Fig.10A schematic diagram of the cooperation structure between the drill bit and the first wheel of the gob-side tunnel retaining pressure relief equipment provided in this application;

[0035] Fig.11 The pressure relief equipment for the gob retaining tunnel provided for this application Figure 3 Enlarged structural diagram at B in the middle.

[0036] Indicated in the figure:

[0037] 1. A first support plate;

[0038] 2. Support mechanism; 201. Spring telescopic rod; 202. Rectangular groove; 203. Threaded cylinder; 204. Guide block; 205. Second support plate;

[0039] 3. Moving mechanism; 301. First wheel; 302. Second wheel; 303. Limit rod;

[0040] 4. Pressure relief mechanism; 401. Rectangular block; 402. Rotating rod; 403. First motor; 404. First base; 405. Second base; 406. Second motor; 407. Cross slot; 408. First electric push rod; 409. Connecting block; 410. Drill bit;

[0041] 5. Support mechanism; 501. Groove; 502. Reciprocating frame; 503. First round rod; 504. Fixed block; 505. First gear; 506. Second gear; 507. Second round rod; 508. Third gear; 509. Fourth gear; 510. Second electric push rod; 511. First annular groove; 512. Second annular groove. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] As described in the background art, traditional mining methods often damage coal seams and surrounding rock formations, resulting in excessive gas pressure in the coal seams, which can easily lead to coal and gas outbursts and threaten the lives and safety of miners.

[0044] In order to solve this technical problem, the present invention provides a method and equipment for unloading pressure along the goaf-retained lane, which is applied in the field of coal mining.

[0045] Specifically, please refer to Figure 1 The pressure relief method for gob-side entry retaining specifically includes:

[0046] The method for unloading pressure in gob-side entry retaining includes the following steps:

[0047] S1. Drilling design: Design the location and size of drilling holes along the gob according to the shape and size of the gob.

[0048] S2. Drilling construction: Use drilling equipment to drill holes on the top of the tunnel to allow gas to escape.

[0049] S3. Formation of pressure relief channel: After the drilling construction is completed, the rocks and coal bodies between the two tunnels are cleaned up to form a pressure relief channel running through the two tunnels.

[0050] S4. Sealing treatment: After the pressure relief channel is formed, the drilled hole is sealed.

[0051] S5. Safety measures: When carrying out pressure relief along the goaf, use protective plates to isolate the space below the borehole. The method of pressure relief along the goaf can not only reduce the pressure in the coal seam and reduce the possibility of coal and gas outbursts, thereby reducing the incidence of coal mine accidents, but also improve the permeability of the coal seam, which is conducive to mechanical mining and improves coal mining efficiency. It can also release gas and other harmful gases in the coal seam in advance, reducing harm to humans and the environment.

[0052] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] Example 1

[0056] Please refer to Figure 1 , a method of unloading pressure by leaving a tunnel along the goaf. It conducts geological survey on the tunnel before drilling construction to obtain information on the physical properties and pressure conditions of the rock and coal body.

[0057] Please refer to Figure 1 , a method of unloading pressure by retaining a tunnel along the goaf, the drilling design of which includes determining the shape, size, depth and location of the borehole.

[0058] Example 2

[0059] The pressure relief method for gob-side entry retaining provided in Example 1 is further optimized. Specifically, Figure 1 As shown, the drilling equipment monitors the drilling speed, pressure and temperature of the drilling rig during the construction process, and the oxygen content should be monitored synchronously when the temperature is monitored.

[0060] Further, such as Figure 1 As shown, after the pressure relief channel is formed, it is reinforced and supported to prevent the channel from deformation and damage.

[0061] Further, such as Figure 1 As shown, the hole sealing process uses quick-setting cement to seal the borehole, and the quick-setting cement is quality controlled and inspected before the hole sealing process, and the air tightness of the hole sealing result is tested and evaluated.

[0062] Example 3

[0063] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 , a pressure relief device for retaining a tunnel along an empty space, comprising two first support plates 1, a support mechanism 2 for supporting a mine tunnel is arranged between the two first support plates 1, a moving mechanism 3 is arranged on the first support plate 1, the moving mechanism 3 comprises two first wheels 301 respectively arranged in two rectangular grooves 202 through bearings, a plurality of limit rods 303 are arranged on one side of the circumference of the first wheel 301, and the moving mechanism 3 further comprises two second wheels 302 respectively arranged in the other two rectangular grooves 202;

[0064] A pressure relief mechanism 4 is provided between the two first support plates 1. The pressure relief mechanism 4 includes two rectangular blocks 401 provided between the two first support plates 1. A rotating rod 402 is provided between the two rectangular blocks 401 through a bearing. A first motor 403 for driving the rotating rod 402 to rotate is provided on one of the rectangular blocks 401. By providing the pressure relief mechanism 4, people can continue to drill holes and relieve pressure on the top of the mine tunnel by controlling the rotation of the drill bit 410. When the drill bit 410 turns to different positions and cooperates with the moving mechanism 3 or the supporting mechanism 5 respectively, the movement and mobile support functions of the equipment can be realized respectively, and the functionality is strong.

[0065] A supporting mechanism 5 is provided at the bottom of the first supporting plate 1, and the supporting mechanism 5 includes four return frames 502 respectively arranged at the bottom of the two first supporting plates 1, and a corrugated cover for collecting gravel is provided at the bottom of the return frame 502. By providing the supporting mechanism 5, the gravel generated during the drilling process can enter the return frame 502 under the guidance of the second supporting plate 205. When the drill bit 410 turns, the second electric push rod 510 can rotate under the transmission of the first gear 505, the second gear 506, the second round rod 507, the third gear 508 and the fourth gear 509, so as to support and lift the first supporting plate 1, and in the process of turning the second electric push rod 510, the corrugated cover can be squeezed, so that the gravel in the corrugated cover can be easily moved to the return frame 502, so that people can take it out easily. The supporting mechanism 5 can not only be used for collecting gravel, but also can cooperate with the pressure relief mechanism 4 for the mobile support of the first supporting plate 1 and the supporting mechanism 2 and the movement of the overall equipment, and has strong functionality.

[0066] Example 4

[0067] Please refer to Figure 2 , Figure 5 and Figure 7 , pressure relief equipment for gob-retaining lanes, the support mechanism 2 includes two spring telescopic rods 201 arranged between two first support plates 1, a rectangular block 401 is installed on the spring telescopic rods 201, two rectangular grooves 202 are provided on the tops of the two first support plates 1, wherein a threaded barrel 203 is provided inside the two rectangular grooves 202, a second support plate 205 is fixedly connected to both sides of the threaded barrel 203, a guide block 204 is fixedly connected to the top of the threaded barrel 203, and the support mechanism 2 is provided to make the drill bit 410 turn to the first wheel When the drill bit 410 is at 301, the second support plate 205 can support the top of the mine tunnel, and under the action of the spring telescopic rod 201, it can cooperate with the comprehensive excavator to support the mine tunnel during the excavation process. When the drill bit 410 is depressurizing during drilling, the fallen gravel can be guided so that most of the gravel can fall into the return frame 502. The support mechanism 2 can not only be used to guide the gravel during the drilling process, but also cooperate with the rectangular slot 202 and the comprehensive excavator to continue to support the mine tunnel after the drill bit 410 turns, and has strong functionality.

[0068] Please refer to Figure 2 , Figure 5 , Figure 8 , Fig. 9 , Fig.10 and Fig.11, a pressure relief device for retaining lanes along the goaf, two first bases 404 are symmetrically arranged on the rotating rod 402, a second base 405 is arranged on the top of the first base 404 through a bearing, a second motor 406 for driving the second base 405 to rotate is fixedly installed on the bottom of the first base 404, four drill bits 410 are arranged on the top of the second base 405, and threads matching the threaded barrel 203 are provided on the drill bits 410, a cross groove 407 is provided on the top of the second base 405, and the four corners inside the cross groove 407 are fixedly connected with first electric push rods 408, and the end of the first electric push rod 408 is fixedly connected with a connecting block 409, and the top of the connecting block 409 is fixedly connected to the bottom of the adjacent drill bit 410. By setting the first electric push rod 408, the cross groove 407 and the connecting block 409 allow people to adjust the gap between the four drill bits 410 by controlling the extension and retraction of the first electric push rod 408, thereby adjusting the diameter of the drill hole, and when the first electric push rod 408 is contracted to the maximum, the steering of the drill bit 410 can be adjusted by controlling the first motor 403, so that the drill bit 410 can be turned to the first wheel 301, and the limit rod 303 can enter the gap between the four drill bits 410, and then when the four drill bits 410 rotate, the first wheel 301 can be driven to rotate, so that the entire device can be moved in the mine tunnel, and the pressure relief mechanism 4 can not only be used for drilling pressure relief at the top of the mine tunnel, but also can be used in conjunction with the moving mechanism 3 to control the movement of the entire device, and has strong functionality.

[0069] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6, the pressure relief equipment for gob-retaining lanes, the support mechanism 5 also includes two grooves 501 respectively opened on both sides of the rectangular groove 202, second electric push rods 510 are arranged on both sides of the bottom end of the first support plate 1, and the ends of the second electric push rods 510 are arranged with first round rods 503, and both ends of the first round rods 503 are arranged with first gears 505 and fixed blocks 504, and the fixed blocks 504 are fixed to the bottom of the first support plate 1, and the first gear 505 is connected to the second gear 506 through a chain extending into the groove 501, and the middle part of the second gear 506 is fixedly connected to the second round rod 507 rotatably connected to the inside of the groove 501, and the end of the second round rod 507 is fixedly connected to the third gear 508, and the third gear 508 is connected to the fourth gear 505 arranged on the rotating rod 402 through a chain. Gear 509, two first annular grooves 511 are provided on the rotating rod 402, a second annular groove 512 located between the two first annular grooves 511 is provided on the rotating rod 402, and two fourth gears 509 on the same second electric push rod 510 are respectively located in the second annular groove 512 and the first annular groove 511 on the same side. By arranging the first gear 505, the second gear 506, the second round rod 507, the third gear 508 and the fourth gear 509, the rotating rod 402 can drive the second electric push rod 510 to rotate during the rotation process. The second electric push rod 510 rotates to different directions to support and lift the first support plate 1 without affecting the movement of the first support plate 1, and can also assist the contraction of the corrugated cover to facilitate the removal of gravel in the corrugated cover.

[0070] The use process of the pressure relief method and equipment for gob-side tunnel retaining provided by the present invention is as follows:

[0071] First, the rotation of the rotating rod 402 is controlled by the first motor 403, and the rotating rod 402 drives the drill bit 410 to enter the first wheel 301, and the second motor 406 is controlled to drive the drill bit 410 to rotate, and the gap between the four drill bits 410 drives the limiting rods 303 of the first wheel 301 to rotate, so that the whole device moves. When it moves to the specified position, the rotating rod 402 is controlled to rotate, and the drill bit 410 is turned over. Figure 2 The position shown needs to be explained. Figure 2 and Figure 3 When the middle drill bit 410 is perpendicular to the first support plate 1, the second electric push rod 510 should also be perpendicular to the first support plate 1 and stand on the ground to control the drill bit 410 to rotate and the second electric push rod 510 to extend and retract, so that the drill bit 410 rotates and drills holes to relieve pressure on the top of the mine tunnel. After the pressure relief is completed, the drill bit 410 is controlled to descend;

[0072] When it is necessary to cooperate with the tunnel boring machine to support the mine tunnel being excavated, the drill bit 410 is controlled to turn to the threaded barrel 203. Under the guidance of the guide block 204, the drill bit 410 pushes the first support plate 1 on the guide block 204 to stretch the spring telescopic rod 201. When the end of the drill bit 410 enters the interior of the threaded barrel 203, the drill bit 410 is repeatedly controlled to rotate forward and reversely so that the drill bit 410 can move inside the threaded barrel 203, and then cooperate with the extension and retraction of the second electric push rod 510 to increase the distance between the two first support plates 1. The second electric push rod 510 located at the front end of the forward direction can be retracted so that the second electric push rod 510 can move to the specified position and then extend. The two second electric push rods 510 at the rear end are retracted, and the drill bit 410 flips to shorten the distance between the two first support plates 1, so that the two first support plates 1 can support the mine tunnel while moving with the tunnel boring machine in the mine tunnel.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A pressure relief method for gob-side entry retention, characterized in that: The following steps are involved: S1. Drilling design: Design the location and size of drilling holes for gob-side tunneling according to the shape and size of the tunnel; S2. Drilling construction: Use drilling equipment to drill holes on the top of the tunnel to allow gas to escape; S3. Formation of pressure relief channel: After the drilling construction is completed, the rock and coal body between the two tunnels are cleaned to form a pressure relief channel running through the two tunnels; S4. Sealing treatment: After the pressure relief channel is formed, the drilled hole is sealed; S5. Safety measures: When carrying out pressure relief along the gob retaining tunnel, use protective plates to isolate the space below the borehole; It also comprises two first support plates (1), a support mechanism (2) for supporting the mine tunnel being arranged between the two first support plates (1), a moving mechanism (3) being arranged on the first support plate (1), the moving mechanism (3) comprising two first wheels (301) respectively arranged in two of the rectangular grooves (202) via bearings, a plurality of limit rods (303) being arranged on one side of the circumference of the first wheel (301), and the moving mechanism (3) further comprising two second wheels (302) respectively arranged in the other two rectangular grooves (202); A pressure relief mechanism (4) is provided between the two first support plates (1), the pressure relief mechanism (4) comprising two rectangular blocks (401) provided between the two first support plates (1), a rotating rod (402) being provided between the two rectangular blocks (401) via a bearing, and a first motor (403) for driving the rotating rod (402) to rotate is provided on one of the rectangular blocks (401); A support mechanism (5) is provided at the bottom of the first support plate (1), the support mechanism (5) comprising four return frames (502) respectively provided at the bottom of the two first support plates (1), and a corrugated cover for collecting gravel is provided at the bottom of the return frames (502); The support mechanism (2) comprises two spring telescopic rods (201) arranged between two first support plates (1), the rectangular block (401) being mounted on the spring telescopic rods (201), the tops of the two first support plates (1) being provided with two rectangular grooves (202), wherein the two rectangular grooves (202) are provided with threaded barrels (203) inside, the two sides of the threaded barrel (203) being fixedly connected to the second support plates (205), and the top of the threaded barrel (203) being fixedly connected to the guide block (204); Two first bases (404) are symmetrically arranged on the rotating rod (402); a second base (405) is arranged at the top of the first base (404) via a bearing; a second motor (406) for driving the second base (405) to rotate is fixedly installed at the bottom of the first base (404); four drill bits (410) are arranged at the top of the second base (405); and threads matching the threaded barrel (203) are provided on the drill bits (410); The support mechanism (5) further comprises two grooves (501) respectively provided on both sides of the rectangular groove (202); a second electric push rod (510) is provided on both sides of the bottom end of the first support plate (1); a first round rod (503) is provided at the end of the second electric push rod (510); a first gear (505) and a fixing block (504) are provided at both ends of the first round rod (503); the fixing block (504) is fixed to the bottom of the first support plate (1); the first gear (505) is connected to the second gear (506) via a chain extending into the groove (501); a second round rod (507) rotatably connected to the inside of the groove (501) is fixedly connected to the middle of the second gear (506); a third gear (508) is fixedly connected to the end of the second round rod (507); the third gear (508) is connected to a fourth gear (509) provided on the rotating rod (402) via a chain; The rotation of the rotating rod (402) is controlled by the first motor (403), and the rotating rod (402) drives the drill bit (410) to enter the first wheel (301). The second motor (406) is controlled to work and drive the drill bit (410) to rotate. The gaps between the four drill bits (410) drive the first wheel (301) and the limit rods (303) to rotate, so that the entire device moves. When the device moves to a specified position, the rotating rod (402) is controlled to rotate and the drill bit (410) is turned over. When the drill bit (410) and the first support plate (1) are perpendicular to each other, the second electric push rod (510) should also be perpendicular to the first support plate (1) and stand on the ground. The drill bit (410) is controlled to rotate and the second electric push rod (510) is extended and retracted, so that the drill bit (410) rotates and releases pressure on the top of the mine tunnel. After the pressure release is completed, the drill bit (410) is controlled to descend. When it is necessary to cooperate with the multi-purpose excavator to support the mine tunnel being excavated, the drill bit (410) is controlled to turn toward the threaded barrel (203). Under the guidance of the guide block (204), the drill bit (410) pushes the first support plate (1) on the guide block (204) to stretch the spring telescopic rod (201). When the end of the drill bit (410) enters the interior of the threaded barrel (203), the drill bit (410) is repeatedly controlled to rotate forward and reverse, so that the drill bit (410) can move inside the threaded barrel (203) to move forward. When the distance between the two first support plates (1) increases in coordination with the extension and retraction of the second electric push rod (510), the second electric push rod (510) located at the front end in the forward direction is retracted so that the second electric push rod (510) can be moved to a specified position and then extended, and the two second electric push rods (510) at the rear end are retracted, and the drill bit (410) is turned over to shorten the distance between the two first support plates (1), thereby enabling the two first support plates (1) to support the mine tunnel while moving with the multi-purpose excavator in the mine tunnel.

2. The pressure relief method for gob-side entry retaining according to claim 1, characterized in that: Before drilling construction, geological surveys are conducted on the tunnels to obtain information on the physical properties and pressure conditions of the rocks and coal bodies.

3. The pressure relief method for gob-side entry retaining according to claim 2 is characterized in that: The drilling design includes determining the shape, size, depth and location of the drilling hole.

4. The pressure relief method for gob-side entry retaining according to claim 3 is characterized in that: The drilling equipment monitors the drilling speed, pressure and temperature of the drilling rig during the construction process, and the oxygen content should be monitored simultaneously when the temperature is monitored.

5. The pressure relief method for gob-side entry retaining according to claim 4 is characterized in that: After the pressure relief channel is formed, it is reinforced and supported to prevent the channel from deformation and damage.

6. The pressure relief method for gob-side entry retaining according to claim 5 is characterized in that: The hole sealing process uses quick-setting cement to seal the drilled hole, and the quick-setting cement is quality controlled and inspected before the hole sealing process, and the sealing result is tested and evaluated for air tightness.

Images