In-situ drilling and cutting weakening rock mass equipment and operation method

Abstract

The application discloses in-situ drilling and cutting weakening rock mass equipment and operation method, water tank and hydraulic lifting platform are installed on walking mechanism, chain sliding table, high-pressure water pump and pressure regulating device are installed on drilling angle adjusting device, walking mechanism is responsible for equipment movement under complex terrain, drilling angle adjusting device and hydraulic lifting platform work cooperatively, and are responsible for adjusting drilling-seam cutting-fracturing drill rod working position and included angle with rock mass working surface, chain sliding table controls drilling and withdrawal of drilling-seam cutting-fracturing drill rod, and pressure regulating device realizes low-pressure auxiliary drilling and high-pressure seam cutting rock by changing water jet working pressure, and switching fracturing water inlet realizes fracturing of hard rock mass. The application integrates drilling, seam cutting and fracturing process, can avoid frequent drilling and withdrawal of drill rod in engineering application, improves the tunneling speed of hard rock mass in underground coal mine, and provides a basis for mechanical impact breaking hard rock mass.

Description

Technical Field

[0001] This invention relates to the field of hydraulic rock breaking application technology, specifically to an in-situ drilling and fracturing equipment and operation method for weakened rock masses. Background Technology

[0002] Hydraulic fracturing technology has been applied relatively early in the oil extraction field, and its mechanism research in deep well rock fracturing is quite mature. In coal mining, hydraulic fracturing technology is often used for gas drainage and prevention of roof collapse at the working face. Taking the latter as an example, in the process of deep coal mining, the presence of a hard roof can easily cause mine shock disasters when the working face is initially pressured. The application of hydraulic fracturing technology can reduce the impact disasters caused by the collapse of the old roof at the coal mine working face and eliminate mine shock disasters caused by the collapse of the roof at the initial mining face. Hydraulic fracturing technology takes advantage of the low tensile strength of rock to form crisscrossing cracks inside hard rock masses, improving the permeability of the rock strata while greatly reducing the strength of the rock structure. Therefore, hydraulic fracturing technology has gradually been introduced into hard rock tunneling in coal mines, assisting tunneling machines in completing hard rock tunneling work in some areas of the mine.

[0003] While hydraulic fracturing technology has demonstrated outstanding performance in assisting the safe and efficient extraction of coal and oil, its application requires extensive preparatory work. In deep coal mining, the preparatory work for implementing hydraulic fracturing technology significantly impacts the rapid excavation of ultra-hard rock tunnels, and also presents problems such as low equipment reliability and poor safety. Therefore, achieving efficient application of hydraulic fracturing technology has become a key issue and challenge in its rapid excavation in hard rock. A comprehensive analysis of existing research on mechanical equipment tunneling assistance technologies reveals that water jet-assisted rock breaking technology has been relatively successful in hard rock tunneling. Therefore, while integrating hydraulic fracturing technology into mechanical tunneling equipment, high-pressure abrasive water jets can be used to pre-cut fractures of a certain depth within hard rock masses, guiding subsequent hydraulic fracturing. The equipment used in water jet rock breaking technology and hydraulic fracturing technology is largely the same; integrating these two technologies into mechanical tunneling equipment avoids problems such as bulky equipment, difficulty in movement, and low operating efficiency. Conversely, integrating the two technologies mentioned above enables water jet-assisted hard rock fracturing, providing the necessary hydraulic pressure for operation, and allows for real-time hydraulic fracturing to reduce the overall structural strength of hard rock masses, making them easier for subsequent mechanical cutting tools to break. The drill-cut-fracture hard rock technology eliminates complex preparation work and improves the process of frequent drill rod retraction and insertion, significantly increasing the efficiency of hard rock fracturing and weakening. This better realizes the application of hydraulic fracturing technology in hard rock tunneling and improves the rapid excavation speed of deep hard rock tunnels. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an in-situ drilling and fracturing equipment and operation method for weakening rock mass. It has a simple structure and is easy to operate. It can reduce the structural strength of the rock at the working face of the roadway under the condition of high ground stress in deep coal mines. It can assist in drilling, cutting guidance and automatic in-situ rock fracturing without frequent drill rod withdrawal. It can also assist in mechanical impact rock breaking, which is of great significance for realizing the rapid excavation of deep hard rock roadways.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an in-situ drilling and fracturing equipment for weakened rock masses, comprising a traveling mechanism, a water tank, a high-pressure water pump, a pressure regulating device, a flexible high-pressure pipe, an integrated drive device, a chain slide, a drilling angle adjusting device, a drilling-fracturing drill rod, and a hydraulic lifting platform. The water tank and the hydraulic lifting platform are mounted on the traveling mechanism. The drilling angle adjusting device is hinged to the hydraulic lifting platform. The chain slide is fixedly mounted on the drilling angle adjusting device by bolts. The flexible high-pressure pipe, the pressure regulating device, and the high-pressure water pump are fixedly mounted on the chain slide. The two ends of the flexible high-pressure pipe are respectively connected to the high-pressure water pump and the inlet of a sliding two-position three-way directional valve. The drilling-fracturing drill rod is connected to the chain slide, the drilling angle adjusting device, and the flexible high-pressure pipe through the integrated drive device.

[0006] Preferably, the integrated drive device includes a drive motor, a reducer, a rotary sealing device I, a rotary sealing device II, and a sliding two-position three-way directional valve. The drive motor, reducer, and drive drill rod are all connected by a key. The rotary sealing device II is fixedly connected to the reducer housing. The outer extension of the rotating shaft of the rotary sealing device I is machined with a sealing tapered thread and connected to the end of the drive drill rod. The sealing rubber water injection channel is connected to one outlet of the sliding two-position three-way directional valve through the rotary sealing device II and the high-pressure pipe. The central channel is connected to the other outlet of the sliding two-position three-way directional valve through the rotary sealing device I and the high-pressure pipe. The inlet of the sliding two-position three-way directional valve is connected to a flexible high-pressure pipe, and the outlet is connected to a water tank.

[0007] Preferably, the drilling-cutting-fracturing drill rod includes a drill bit, a front sealing drill rod, a cutting and fracturing drill rod, a rear sealing drill rod, a regular connecting drill rod, and a drive drill rod connected in sequence by tapered threads. Each drill rod has a symmetrically machined sealing rubber water injection channel and a central channel inside. One-way valves are installed inside the cutting hole and fracturing hole on the cutting and fracturing drill rod.

[0008] More preferably, the rotary sealing device I includes a rotary shaft, a sealing housing, a sealing end cap, a tapered roller bearing, a carbide valve seat, a sealing guide sleeve, a temperature measuring probe, a drain hole, and a water injection hole. The sealing guide sleeve and the carbide valve seat have corresponding positions on their contact surfaces. The sealing housing and the sealing end cap are connected by threads. The outer extension of the rotary shaft is machined with a sealing tapered thread. The position on the rotary shaft where the tapered roller bearing is installed is machined with an annular stepped end face. The carbide valve seat and the sealing guide sleeve are respectively embedded in the rotary shaft and the sealing end cap. The rotary sealing device II is connected to the drive drill rod through a deep groove ball bearing and is fixed to the reducer housing by bolts.

[0009] More preferably, the drill bit end face is welded with hemispherical wear-resistant cutting teeth, the drill bit is machined with an inclined flow channel inside, the inlet of the inclined flow channel is connected to the central flow channel inside the drill bit, and a high-pressure nozzle is welded at the corresponding position of the outlet of the inclined flow channel, with the welding angle of the high-pressure nozzle between 30° and 90°.

[0010] More preferably, the drill rod includes a sealing rubber, an elastic steel plate, a slip ring, a pressure control valve, a front-end sealing drill rod body, a rectangular groove, a water outlet, a vertical hole, a pressure ring, a water injection channel for the sealing rubber, a central channel, and a water storage tank. The pressure control valve consists of a valve sleeve, a valve core, and a return spring. The valve core has vertically intersecting T-shaped channels machined inside, with the end diameter larger than the central channel. The return spring is sleeved on the valve core and installed inside the valve sleeve. The outer cylindrical surface of the valve sleeve is threaded, and the end face is machined with an internal hexagonal groove, which is installed at the water outlet. The front-end sealing drill rod... The outer surface of the main body is machined with rectangular grooves evenly distributed around the circumference. A vertical hole is machined in the center of the boss between two rectangular grooves. The vertical hole is connected to the water injection channel of the sealing rubber. An elastic steel plate is installed in the rectangular groove. Slip rings are installed at both ends. A fixed thickness boss is welded to the inner side of the slip ring. The two ends of the elastic steel plate are in contact with the end face of the inner boss of the slip ring. The slip ring is made of elastic material and machined into a semi-circle. The length of the cylindrical section between the two ends of the rectangular groove and the contact end face of the sealing rubber and the front sealing drill rod body is 200mm, and the surface is smooth. The pressure ring is pressed on both ends of the sealing rubber.

[0011] In a further preferred embodiment, the slotted fracturing drill rod includes a cutter relief groove, a fracturing hole, a slotting hole, a nozzle, an O-ring, a sealing rubber water injection channel, a central channel, a one-way valve, and a water storage tank. The fracturing hole is connected to the sealing rubber water injection channel, and a one-way valve is installed at the outlet of the fracturing hole. The slotting hole is connected to the central channel, and a one-way valve is installed at the bottom of the slotting hole and a nozzle is installed at the top. The slotting hole and the fracturing hole in the slotted fracturing drill rod are perpendicular to the central channel but do not intersect. A water storage tank is machined at the connection of the sealing rubber water injection channel.

[0012] This invention also provides a method for operating an in-situ drilling and fracturing weakened rock mass equipment, comprising the following steps:

[0013] S1: Drilling position adjustment: The traveling mechanism moves to the rock excavation face, controls the extension and retraction length of the hydraulic cylinder, adjusts the angle between the hydraulic lifting platform and the drilling angle adjustment device and the rock mass, so that the drilling-cutting-fracture drill rod is aligned with the drilling position at a predetermined angle.

[0014] S2: Drilling: Adjust the pressure regulating device to control the water jet output dynamic pressure at a low level, start the high-pressure water pump and the drive motor inside the integrated drive device to drive the drill-fracturing drill rod to rotate. Then, adjust the pressure regulating device to increase the working pressure of the water jet. Next, start the chain slide to advance the drill-fracturing drill rod into the hard rock mass. The water jet passes through the central flow channel of each section of the drill rod, the pressure control valve, and the inclined flow channel inside the drill bit, and finally sprays out through the high-pressure nozzle to assist the drill bit in drilling into the rock mass.

[0015] S3: Slotting: After drilling to the predetermined depth, turn off the drive device of the chain slide, the chain slide self-locks, adjust the pressure regulating device to increase the working pressure of the water jet, the pressure control valve is closed under high pressure, the one-way valve above the slotting hole is opened, and the nozzle rotates with the drill hole-slotting-fracture drill rod to slot the rock until the slotting depth can no longer be increased.

[0016] S4: Fracturing and Reset: Turn off the drive motor in the integrated drive unit, the drill-cut-fracturing drill rod stops rotating, adjust the pressure regulating device to reduce the working pressure of the water jet, adjust the sliding two-position three-way directional valve to switch the water injection channel of the sealing rubber, and then increase the working pressure of the water jet. The sealing rubber begins to expand and contacts the borehole rock wall. Subsequently, the one-way valve on the fracturing hole opens, and the working pressure of the water jet in the rock cut continues to rise. After the fracturing target is achieved, adjust the pressure regulating device to reduce the working pressure of the water jet, and then turn off the high-pressure water pump. The elastic steel plate pushes the slip ring to move towards both ends of the drill rod, and the sealing rubber returns to its original shape under its own elastic contraction and the push of the slip ring.

[0017] S5: Repeat steps S2, S3, and S4 to complete the drilling, cutting, and fracturing process of the hard rock mass, fracturing the rock mass into thin plates, thereby weakening the overall strength of the rock mass. After completing the drilling, cutting, and fracturing of the rock mass at a specific location, proceed to step S1 to change the drilling position or angle and continue the rock mass weakening construction.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention utilizes the characteristic of low tensile strength of rock, integrates water jet rock breaking technology and hydraulic fracturing technology into hard rock drilling equipment, and by controlling the working pressure of water jet, it sequentially achieves low-pressure assisted drilling, medium-pressure rock cutting, and high-pressure rock fracturing, thereby weakening the structural strength of hard rock, creating more favorable tunneling working conditions for mechanical impact crushing, realizing rapid tunneling of hard rock tunnels under deep well high ground stress conditions, and optimizing the integrated equipment mechanism while achieving safe and efficient production. Attached Figure Description

[0019] Figure 1 A schematic diagram of an in-situ drilling and fracturing equipment for weakened rock masses provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the drilling-cutting-fracture drill pipe operation provided in an embodiment of the present invention;

[0021] Figure 3 A cross-sectional view of the rotary sealing device provided in an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of a drill bit provided in an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of the front sealing drill rod provided in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of a slotted-fracturing drill pipe provided in an embodiment of the present invention.

[0025] In the diagram: 1. Walking mechanism; 2. Water tank; 3. High-pressure water pump; 4. Pressure regulating device; 5. Flexible high-pressure pipe; 6. Integrated drive device; 7. Chain slide; 8. Drilling angle adjusting device; 9. Drilling-cutting-fracturing drill rod; 10. Hydraulic lifting platform; 6-1. Drive motor; 6-2. Reducer; 6-3. Rotary sealing device I; 6-4. Rotary sealing device II; 6-5. Sliding two-position three-way directional valve; 6-3-1 Rotating shaft; 6-3-2 Seal housing; 6-3-3 Seal end cap; 6-3-4 Tapered roller bearing; 6-3-5 Carbide valve seat; 6-3-6 Seal guide sleeve; 6-3-7 Temperature measurement probe; 6-3-8 Drain hole; 6-4-1 Deep groove ball bearing; 9-1 Drill bit; 9-2 Front sealing drill rod; 9-3 Fracturing drill rod; 9-4 Rear sealing drill rod 9-5. Standard connecting drill pipe; 9-6. Drive drill pipe; 9-7. Sealing rubber water injection channel; 9-8. Central flow channel; 9-9. Check valve; 9-10. Water storage tank; 9-1-1. Hemispherical wear-resistant cutting teeth; 9-1-2. Inclined flow channel; 9-1-3. High-pressure nozzle; 9-2-1. Sealing rubber; 9-2-2. Elastic steel plate; 9-2-3. Slip ring; 9-2-4. Pressure control valve; 9-2-5. Front end Sealed drill rod body; 9-2-6, rectangular groove; 9-2-7, water outlet; 9-2-8, vertical hole; 9-2-9, pressure ring; 9-2-4-1, valve sleeve; 9-2-4-2, valve core; 9-2-4-3, return spring; 9-2-4-4, internal hexagonal groove; 9-3-1, cutter relief groove; 9-3-2, fracturing hole; 9-3-3, slit hole; 9-3-4, nozzle; 9-3-5, O-ring. Detailed Implementation

[0026] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1-2 This invention provides a technical solution: an in-situ drilling and fracturing equipment for weakened rock masses, comprising a traveling mechanism 1, a water tank 2, a high-pressure water pump 3, a pressure regulating device 4, a flexible high-pressure pipe 5, an integrated drive device 6, a chain slide 7, a drilling angle adjusting device 8, a drilling-cutting-fracturing drill rod 9, and a hydraulic lifting platform 10. The water tank 2 and the hydraulic lifting platform 10 are mounted on the traveling mechanism 1. The drilling angle adjusting device 8 is hinged to the hydraulic lifting platform 10. The chain slide 7 is fixedly mounted on the drilling angle adjusting device 8 by bolts. The flexible high-pressure pipe 5, the pressure regulating device 4, and the high-pressure water pump 3 are fixedly mounted on the chain slide 7. The two ends of the flexible high-pressure pipe 5 are respectively connected to the high-pressure water pump 3 and the inlet of a sliding two-position three-way directional valve 6-5. The drilling-cutting-fracturing drill rod 9 is connected to the chain slide 7, the drilling angle adjusting device 8, and the flexible high-pressure pipe 5 through the integrated drive device 6.

[0028] The lifting and lowering device 10 and the drilling angle adjustment device 8 are used to adjust the angle between the drilling-cutting-fracturing drill rod 9 and the rock mass. The water tank 2, high-pressure water pump 3, pressure regulating device 4, flexible high-pressure pipe 5, and integrated drive device 6 form a high-pressure water system to assist drilling-cutting-fracturing work. The integrated drive device 6 is used to adjust the working pressure of the water jet to assist drilling-cutting-fracturing work in the rock mass. The power system of the device includes a walking mechanism 1 and a chain slide 7. The walking mechanism 1 is located below the device and is used to drive the device to move. The chain slide 7 is used to push the drilling-cutting-fracturing drill rod 9 into the hard rock mass.

[0029] The specific working steps of this embodiment are as follows: The traveling mechanism 1 drives the device to the predetermined working position; the hydraulic lifting platform 10 and the drilling angle adjustment device 8 are controlled to adjust the angle between the drill-fracturing drill rod 9 and the rock mass, aligning the drill rod 9 with the drilling position; then, drilling is performed; the pressure regulating device 4 is adjusted, and then the high-pressure water pump 3 is turned on, starting the integrated drive device 6 to drive the drill-fracturing drill rod 9 to rotate; the pressure regulating device 4 is adjusted to increase the water jet working pressure; the chain slide 7 is used to advance the drill-fracturing drill rod 9 into the hard rock mass for drilling operations; then, fracturing operations are performed, and after reaching the predetermined depth... The drive unit of the chain slide 7 is turned off, and the chain slide 7 self-locks. The pressure regulating device 4 is adjusted to increase the working pressure of the water jet. The fracturing drill rod 9-3 rotates the rock as the drill-fracturing drill rod 9 rotates. Finally, the fracturing work is carried out. The drive unit of the drill-fracturing drill rod 9 inside the integrated drive device 6 is turned off. The sealing rubber 9-2-1 on the drill-fracturing drill rod 9 begins to expand by changing the water flow channel, sealing the rock walls on both sides of the borehole. High-pressure water enters the sealing rock wall. The water jet pressure continues to rise, fracturing the target area. Finally, the high-pressure water pump is turned off, and the system is reset to complete the work.

[0030] Specifically, the integrated drive unit 6 includes a drive motor 6-1, a reducer 6-2, a rotary sealing device I 6-3, a rotary sealing device II 6-4, and a sliding two-position three-way directional valve 6-5. The drive motor 6-1, reducer 6-2, and drive drill rod 9-6 are all connected by a key. The rotary sealing device II 6-4 is fixedly connected to the housing of the reducer 6-2. The outer extension of the rotating shaft 6-3-1 of the rotary sealing device I 6-3 is machined with a sealing tapered thread and connected to the end of the drive drill rod 9-6. The sealing rubber water injection channel 9-7 is connected to one outlet of the sliding two-position three-way directional valve 6-5 via the rotary sealing device II 6-4 and a high-pressure pipe. The central channel 9-8 is connected to the other outlet of the sliding two-position three-way directional valve 6-5 via the rotary sealing device I 6-3 and a high-pressure pipe. The inlet of the sliding two-position three-way directional valve 6-5... A flexible high-pressure pipe 5 is connected to the water inlet, and a water tank 2 is connected to the outlet. Water flows through the flexible high-pressure pipe 5 into a sliding two-position three-way directional valve 6-5, and is split through two outlets, entering the central flow channel 9-8 and the sealing rubber water injection channel 9-7 respectively. The drive motor 6-1 drives the drilling-cutting-fracturing drill rod 9 to rotate. The sliding two-position three-way directional valve 6-5 changes the flow channel of the high-pressure water jet, allowing the high-pressure water to enter the drill bit 9-1 through the central flow channel 9-8 to assist in drilling. Through the sliding two-position three-way directional valve 6-5 and the sealing rubber water injection channel 9-7, the water enters the sealing rubber 9-2-1, causing the sealing rubber 9-2-1 to expand and seal the cutting-fracturing area. Through the cutting-fracturing drill rod 9-3, the water enters the cutting hole 9-3-3 and the fracturing hole 9-3-2 respectively to perform cutting and fracturing work in the target area.

[0031] Specifically, the drilling-fracturing-cutting drill rod 9 includes a drill bit 9-1, a front sealing drill rod 9-2, a fracturing-cutting drill rod 9-3, a rear sealing drill rod 9-4, a standard connecting drill rod 9-5, and a drive drill rod 9-6 connected sequentially by tapered threads. Each drill rod has symmetrically machined sealing rubber water injection channels 9-7 and a central channel 9-8 inside. One-way valves 9-9 are installed inside the fracturing holes 9-3-3 and 9-3-2 on the fracturing drill rod 9-3. The drilling-fracturing-cutting drill rod 9 consists of multiple sections of drill rod. The drill rod is made of threaded connections. The multi-section drill rod can be divided into the front section drill rod, which is used for drilling; the sealing drill rod, which isolates the cutting and fracturing areas inside the working hole through rubber expansion; the cutting-fracturing drill rod 9-3, which is used to cut and fracture the rock blocks in the working area. The cutting hole 9-3-3 and the fracturing hole 9-3-2 on the drill rod at this location work interactively through a sliding two-position three-way directional valve 6-5, without affecting each other during cutting and fracturing; and the drive drill rod 9-6, which is used to drive the entire drilling-cutting-fracturing drill rod 9 to work.

[0032] Please see Figure 3 As a further preferred embodiment, the rotary sealing device I6-3 includes a rotating shaft 6-3-1, a sealing housing 6-3-2, a sealing end cap 6-3-3, a tapered roller bearing 6-3-4, a carbide valve seat 6-3-5, a sealing guide sleeve 6-3-6, a temperature measuring probe hole 6-3-7, a drain hole 6-3-8, and a water injection hole 6-3-9. The corresponding positions of the contact surfaces of the sealing guide sleeve 6-3-6 and the carbide valve seat 6-3-5 are... A temperature measuring probe 6-3-7 and a drain hole 6-3-8 are provided. The sealing housing 6-3-2 and the sealing end cover 6-3-3 are connected by threads. The outer extension of the rotating shaft 6-3-1 is machined with a sealing tapered thread. An annular stepped end face is machined at the position on the rotating shaft 6-3-1 where the tapered roller bearing 6-3-4 is installed. The carbide valve seat 6-3-5 and the sealing guide sleeve 6-3-6 are respectively embedded and installed on the rotating shaft 6-3-1 and the sealing end cover 6-3-8. Inside 3-3, the rotary sealing device II6-4 is connected to the drive drill rod 9-6 via a deep groove ball bearing 6-4-1 and is fixed to the reducer housing 6-2 with bolts. The rotary sealing device I6-3 connects the borehole-fracturing drill rod 9 and the high-pressure water system, specifically connecting to the flexible high-pressure pipe 5 in the high-pressure water system. High-pressure water enters the sliding two-position three-way directional valve 6-5 through the flexible high-pressure pipe 5. The sliding two-position three-way directional valve 6-5 can choose to enter the central flow channel 9-8 through the water injection hole 6-3-9 or enter the sealing rubber water injection channel 9-7. The rotary sealing device I6-3, in conjunction with the sliding two-position three-way directional valve 6-5, is used to ensure the flow distribution of the high-pressure water jet during operation. At the same time, the rotary sealing device I6-3 performs a rotary seal on the water flow entering the borehole-fracturing drill rod 9, and is also equipped with a drain hole 6-3-8 for pressure relief and drainage.

[0033] Please see Figure 4 As a further preferred embodiment, the end face of drill bit 9-1 is annularly welded with hemispherical wear-resistant cutting teeth 9-1-1, and the inside of drill bit 9-1 is machined with inclined flow channels 9-1-2. The inlet of inclined flow channels 9-1-2 is connected to the central flow channel 9-8 inside drill bit 9-1. The outlet of inclined flow channels 9-1-2 is welded with high-pressure nozzles 9-1-3 at the corresponding position. The welding angle of high-pressure nozzles 9-1-3 is between 30° and 90°. The water jet passes through the central flow channel 9-8 of each section of drill rod, the pressure control valve 9-2-4, and the inclined flow channel 9-1-2 inside drill bit 9-1, and is finally ejected through the high-pressure nozzles 9-1-3 to assist drill bit 9-1 in drilling into the rock mass.

[0034] Please see Figure 5As a further preferred embodiment, the front-end sealing drill rod 9-2 includes a sealing rubber 9-2-1, an elastic steel plate 9-2-2, a slip ring 9-2-3, a pressure control valve 9-2-4, a front-end sealing drill rod body 9-2-5, a rectangular groove 9-2-6, a water outlet 9-2-7, a vertical hole 9-2-8, a pressure ring 9-2-9, a water injection channel for the sealing rubber 9-7, a central channel 9-8, and a water storage tank 9-10. The pressure control valve 9-2-4 consists of a valve sleeve 9-2-4-1 and a valve core 9-2-4-1. The valve core 9-2-4-2 consists of three parts: a valve core 9-2-4-2, a return spring 9-2-4-3, and a valve sleeve 9-2-4-1. The valve core 9-2-4-2 has vertically intersecting T-shaped flow channels machined internally, with the end diameter larger than the central flow channel 9-8. The return spring 9-2-4-3 is fitted onto the valve core 9-2-4-2 and installed inside the valve sleeve 9-2-4-1. The outer cylindrical surface of the valve sleeve 9-2-4-1 is threaded, and the end face is machined with an internal hexagonal groove 9-2-4-4, which is installed at the outlet 9-2-7. The outer surface of the front sealing drill rod body 9-2-5 is reinforced with… The drill rod has evenly distributed rectangular grooves 9-2-6 around its circumference. A vertical hole 9-2-8 is machined at the center of the boss between two rectangular grooves 9-2-6. The vertical hole 9-2-8 communicates with the water injection channel 9-7 of the sealing rubber. An elastic steel plate 9-2-2 is installed inside the rectangular grooves 9-2-6, and slip rings 9-2-3 are installed at both ends. A fixed thickness boss is welded to the inner side of the slip rings 9-2-3 for the expansion of the sealing rubber 9-2-1. During the relative sliding of the slip rings 9-2-3 along the drill rod axial direction, the elastic rubber is compressed. Conversely, the water pressure inside the sealing rubber water injection channel 9-7 decreases, and the two ends of the elastic steel plate 9-2-2 contact the inner boss end face of the slip ring 9-2-3, indirectly pushing the sealing rubber 9-2-1 to move towards both ends of the drill rod, realizing the automatic contraction of the sealing rubber 9-2-1. The slip ring 9-2-3 is made of elastic material and processed into a semi-circle. The cylindrical section of the rectangular groove 9-2-6 is 200 mm long from the contact end face of the sealing rubber 9-2-1 and the front sealing drill rod body 9-2-5, and the surface is smooth. The pressure ring 9-2-9 is pressed on both ends of the sealing rubber 9-2-1. The function of the water storage tank 9-10 is to avoid the misalignment problem of the sealing rubber water injection channel 9-7 during the connection of multiple drill rod sections. The rear sealing drill rod 9-4 has the same function and similar structure as the front sealing drill rod 9-3. The difference is that the fracturing water injection channel 9-7 of the front sealing drill rod 9-3 is not processed through.

[0035] Please see Figure 6As a further preferred embodiment, the slotted-fracturing drill rod 9-3 includes a relief groove 9-3-1, a fracturing hole 9-3-2, a slotting hole 9-3-3, a nozzle 9-3-4, an O-ring 9-3-5, a sealing rubber water injection channel 9-7, a central channel 9-8, a one-way valve 9-9, and a water storage tank 9-10. The fracturing hole 9-3-2 is connected to the sealing rubber water injection channel 9-7, and a one-way valve 9-9 is installed at the outlet of the fracturing hole 9-3-2. The slotting hole 9-3-3 is connected to the central channel 9-8. A one-way valve 9-9 is installed at the bottom of the slotting hole 9-3-3, and a nozzle 9-3-4 is installed at the top. The slotting hole 9-3-3 and the fracturing hole 9-3-2 in the slotted-fracturing drill rod 9-3 are spatially perpendicular to but do not intersect with the central channel 9-8. A water storage tank 9-10 is machined at the connection of the sealing rubber water injection channel 9-7.

[0036] The specific operating method steps of this invention are as follows:

[0037] S1: Drilling position adjustment: The traveling mechanism 1 moves to the rock excavation face, controls the extension and retraction length of the hydraulic cylinder, adjusts the angle between the hydraulic lifting platform 10 and the drilling angle adjustment device 8 and the rock mass, so that the drilling-cutting-fracturing drill rod 9 is aligned with the drilling position at a predetermined angle.

[0038] S2: Drilling: Adjust the pressure regulating device 4 to control the water jet output dynamic pressure at a low level, start the high-pressure water pump 3 and the drive motor 6-1 inside the integrated drive device 6 to drive the drill-fracturing drill rod 9 to rotate. Then, adjust the pressure regulating device 4 to increase the working pressure of the water jet. Next, start the chain slide table 7 to advance the drill-fracturing drill rod 9 into the hard rock mass. The water jet passes through the central flow channel 9-8 of each section of the drill rod, the pressure control valve 9-2-4, the inclined flow channel 9-1-2 inside the drill bit 9-1, and finally sprays out through the high-pressure nozzle 9-1-3 to assist the drill bit 9-1 in drilling into the rock mass.

[0039] S3: Cutting: After drilling to the predetermined depth, turn off the drive device of the chain slide 7, the chain slide 7 self-locks, adjust the pressure regulating device 4 to increase the working pressure of the water jet, under high pressure, the pressure control valve 9-2-4 is closed, the one-way valve 9-9 above the cutting hole 9-3-3 is opened, and the nozzle 9-3-4 rotates with the drill hole-cutting-fracture drill rod 9 to cut the rock until the cutting depth can no longer be increased;

[0040] S4: Fracturing and Reset: Turn off the drive motor 6-1 in the integrated drive device 6, the drill rod 9 stops rotating, adjust the pressure regulating device 4 to reduce the working pressure of the water jet, adjust the sliding two-position three-way directional valve 6-5 to switch the water injection channel 9-7 of the sealing rubber, and then increase the working pressure of the water jet. The sealing rubber 9-2-1 begins to expand and contacts the borehole rock wall. Then the one-way valve 9-9 on the fracturing hole 9-3-2 opens, and the working pressure of the water jet in the rock fissure continues to rise. After the fracturing target is achieved, adjust the pressure regulating device 4 to reduce the working pressure of the water jet, and then turn off the high-pressure water pump. The elastic steel plate 9-2-2 pushes the slip ring 9-2-3 to move towards both ends of the drill rod. The sealing rubber 9-2-1 returns to its original shape under its own elastic contraction and the push of the slip ring 9-2-3.

[0041] S5: Repeat steps S2, S3, and S4 to complete the drilling, cutting, and fracturing process of the hard rock mass, fracturing the rock mass into thin plates, thereby weakening the overall strength of the rock mass. After completing the drilling, cutting, and fracturing of the rock mass at a specific location, proceed to step S1 to change the drilling position or angle and continue the rock mass weakening construction.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An in-situ drilling and fracturing equipment for weakened rock masses, characterized in that: The system includes a walking mechanism (1), a water tank (2), a high-pressure water pump (3), a pressure regulating device (4), a flexible high-pressure pipe (5), an integrated drive device (6), a chain slide (7), a drilling angle adjusting device (8), a drilling-cutting-fracturing drill rod (9), and a hydraulic lifting platform (10). The water tank (2) and the hydraulic lifting platform (10) are mounted on the walking mechanism (1). The drilling angle adjusting device (8) is hinged to the hydraulic lifting platform (10). The chain slide (7) is fixedly mounted on the drilling angle adjusting device (8) by bolts. The flexible high-pressure pipe (5), the pressure regulating device (4), and the high-pressure water pump (3) are fixedly mounted on the chain slide (7). The two ends of the flexible high-pressure pipe (5) are respectively connected to the inlet of the high-pressure water pump (3) and the sliding two-position three-way directional valve (6-5). The drilling-cutting-fracturing drill rod (9) is connected to the chain slide (7), the drilling angle adjusting device (8), and the flexible high-pressure pipe (5) through the integrated drive device (6). The integrated drive unit (6) includes a drive motor (6-1), a reducer (6-2), a rotary sealing device I (6-3), a rotary sealing device II (6-4), and a sliding two-position three-way directional valve (6-5). The drive motor (6-1), the reducer (6-2), and the drive drill rod (9-6) are all connected by a key. The rotary sealing device II (6-4) is fixedly connected to the housing of the reducer (6-2). The rotating shaft (6-3-1) of the rotary sealing device I (6-3) is located outside... The extended part is machined and sealed with a tapered thread at the end of the drive drill rod (9-6). The sealing rubber water injection channel (9-7) is connected to one outlet of the sliding two-position three-way directional valve (6-5) through the rotary sealing device II (6-4) and the high pressure pipe. The central channel (9-8) is connected to the other outlet of the sliding two-position three-way directional valve (6-5) through the rotary sealing device I (6-3) and the high pressure pipe. The inlet of the sliding two-position three-way directional valve (6-5) is connected to a flexible high pressure pipe (5), and the outlet is connected to the water tank (2). The drilling-fracturing-cutting drill rod (9) includes a drill bit (9-1), a front sealing drill rod (9-2), a fracturing-cutting drill rod (9-3), a rear sealing drill rod (9-4), a normal connecting drill rod (9-5), and a drive drill rod (9-6) connected in sequence by tapered threads. Each drill rod has a symmetrically machined sealing rubber water injection channel (9-7) and a central channel (9-8). The cutting hole (9-3-3) and fracturing hole (9-3-2) on the fracturing-cutting drill rod (9-3) are equipped with a one-way valve (9-9).

2. The in-situ drilling and fracturing equipment for weakened rock mass according to claim 1, characterized in that: The rotary sealing device I (6-3) includes a rotating shaft (6-3-1), a sealing housing (6-3-2), a sealing end cap (6-3-3), a tapered roller bearing (6-3-4), a carbide valve seat (6-3-5), a sealing guide sleeve (6-3-6), a temperature measuring probe (6-3-7), a drain hole (6-3-8), and a water injection hole (6-3-9). The sealing guide sleeve (6-3-6) and the carbide valve seat (6-3-5) have corresponding positions on their contact surfaces. 3-2) The sealing end cover (6-3-3) is connected by threads. The outer part of the rotating shaft (6-3-1) is machined with sealing tapered threads. The position on the rotating shaft (6-3-1) where the tapered roller bearing (6-3-4) is installed is machined with an annular stepped end face. The carbide valve seat (6-3-5) and the sealing guide sleeve (6-3-6) are respectively embedded in the rotating shaft (6-3-1) and the sealing end cover (6-3-3). The rotating sealing device II (6-4) is connected to the drive drill rod (9-6) through the deep groove ball bearing (6-4-1) and is fixed to the reducer (6-2) housing by bolts.

3. The in-situ drilling and fracturing equipment for weakened rock masses according to claim 1, characterized in that: The drill bit (9-1) has a hemispherical wear-resistant cutting tooth (9-1-1) welded to the end face. An inclined flow channel (9-1-2) is machined inside the drill bit (9-1). The inlet of the inclined flow channel (9-1-2) is connected to the central flow channel (9-8) inside the drill bit (9-1). A high-pressure nozzle (9-1-3) is welded to the corresponding position at the outlet of the inclined flow channel (9-1-2). The welding angle of the high-pressure nozzle (9-1-3) is between 30° and 90°.

4. The in-situ drilling and fracturing equipment for weakened rock mass according to claim 1, characterized in that: The front sealing drill rod (9-2) includes a sealing rubber (9-2-1), an elastic steel plate (9-2-2), a slip ring (9-2-3), a pressure control valve (9-2-4), a front sealing drill rod body (9-2-5), a rectangular groove (9-2-6), a water outlet (9-2-7), a vertical hole (9-2-8), a pressure ring (9-2-9), a water injection channel for the sealing rubber (9-7), a central channel (9-8), and a water storage tank (9-10). The pressure control valve (9-2-4) consists of three parts: valve sleeve (9-2-4-1), valve core (9-2-4-2), and return spring (9-2-4-3). The valve core (9-2-4-2) has vertically intersecting T-shaped flow channels machined inside, with the end diameter larger than the central flow channel (9-8). The return spring (9-2-4-3) is fitted onto the valve core (9-2-4-2) and installed inside the valve sleeve (9-2-4-1). The outer diameter of the valve sleeve (9-2-4-1) is... The cylindrical surface is threaded, and the end face is machined with an internal hexagonal groove (9-2-4-4). It is installed at the water outlet (9-2-7). The outer surface of the front sealing drill rod body (9-2-5) is machined with rectangular grooves (9-2-6) evenly distributed around the circumference. A vertical hole (9-2-8) is machined at the center of the boss between two rectangular grooves (9-2-6). The vertical hole (9-2-8) is connected to the sealing rubber water injection channel (9-7). The rectangular groove (9-2-6) is installed inside. The elastic steel plate (9-2-2) has slip rings (9-2-3) installed at both ends. The inner side of the slip ring (9-2-3) is welded with a fixed thickness boss. The two ends of the elastic steel plate (9-2-2) are in contact with the inner boss end face of the slip ring (9-2-3). The slip ring (9-2-3) is made of elastic material and processed into a semi-circle. The cylindrical section of the rectangular groove (9-2-6) at both ends is 200 mm from the contact end face of the sealing rubber (9-2-1) and the front sealing drill rod body (9-2-5), and the surface is smooth. The pressure ring (9-2-9) is pressed on both ends of the sealing rubber (9-2-1).

5. The in-situ drilling and fracturing equipment for weakened rock mass according to claim 1, characterized in that: The slotted-fracturing drill pipe (9-3) includes a cutter relief groove (9-3-1), a fracturing hole (9-3-2), a slotting hole (9-3-3), a nozzle (9-3-4), an O-ring (9-3-5), a sealing rubber water injection channel (9-7), a central channel (9-8), a one-way valve (9-9), and a water storage tank (9-10). The fracturing hole (9-3-2) is connected to the sealing rubber water injection channel (9-7), and the fracturing hole (9-3-2) outputs... A one-way valve (9-9) is installed at the port. The slotted hole (9-3-3) is connected to the central flow channel (9-8). A one-way valve (9-9) is installed at the bottom of the slotted hole (9-3-3) and a nozzle (9-3-4) is installed at the top. The slotted hole (9-3-3) and the fracturing hole (9-3-2) in the slotted-fracturing drill rod (9-3) are spatially perpendicular to the central flow channel (9-8) but do not intersect. A water storage tank (9-10) is machined at the connection of the sealing rubber water injection channel (9-7).

6. A method for operating an in-situ drilling and fracturing weakened rock mass equipment, comprising the in-situ drilling and fracturing weakened rock mass equipment as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: Drilling position adjustment: The walking mechanism (1) runs to the rock excavation face, controls the extension and retraction length of the hydraulic cylinder, adjusts the angle between the hydraulic lifting platform (10) and the drilling angle adjustment device (8) and the rock mass, so that the drilling-cutting-fracturing drill rod (9) is aligned with the drilling position at a predetermined angle. S2: Drilling: Adjust the pressure regulating device (4) to control the water jet output dynamic pressure at a low level, start the high pressure water pump (3) and the drive motor (6-1) inside the integrated drive device (6) to drive the drill-cut-fracturing drill rod (9) to rotate, then adjust the pressure regulating device (4) to increase the working pressure of the water jet, then start the chain slide (7) to advance the drill-cut-fracturing drill rod (9) to drill into the hard rock mass, the water jet passes through the central flow channel (9-8) of each section of the drill rod, the pressure control valve (9-2-4), the inclined flow channel (9-1-2) inside the drill bit (9-1), and finally sprays out through the high pressure nozzle (9-1-3) to assist the drill bit (9-1) in drilling into the rock mass; S3: Cutting: After drilling to the predetermined depth, turn off the drive device of the chain slide (7), the chain slide (7) self-locks, adjust the pressure regulating device (4) to increase the working pressure of the water jet, the pressure control valve (9-2-4) is closed under high pressure, the one-way valve (9-9) above the cutting hole (9-3-3) is opened, the nozzle (9-3-4) rotates with the drill hole-cutting-fracture drill rod (9) to cut the rock until the cutting depth cannot be increased; S4: Fracturing and Reset: Turn off the drive motor (6-1) in the integrated drive device (6), the drill-cut-fracturing drill rod (9) stops rotating, adjust the pressure regulating device (4) to reduce the working pressure of the water jet, adjust the sliding two-position three-way directional valve (6-5) to switch the sealing rubber water injection channel (9-7), and then increase the working pressure of the water jet. The sealing rubber (9-2-1) begins to expand and contacts the borehole rock wall. Then the one-way valve (9-9) on the fracturing hole (9-3-2) opens, and the working pressure of the water jet in the rock cut continues to rise. After the fracturing target is achieved, adjust the pressure regulating device (4) to reduce the working pressure of the water jet, and then turn off the high-pressure water pump (3). The elastic steel plate (9-2-2) pushes the slip ring (9-2-3) to move towards both ends of the drill rod. The sealing rubber (9-2-1) returns to its original state under its own elastic contraction and the push of the slip ring (9-2-3). S5: Repeat steps S2, S3, and S4 to complete the drilling, cutting, and fracturing process of the hard rock mass, fracturing the rock mass into thin plates, thereby weakening the overall strength of the rock mass; after completing the drilling, cutting, and fracturing of the rock mass at a specific location, proceed to step S1 to change the drilling position or angle and continue the rock mass weakening construction.

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