Hard rock drilling device and drilling method based on water-grinding drill

Abstract

The present application provides a hard rock drilling device based on a water-grinding drill, comprising a supporting column and a supporting frame, a swing arm frame with an adjustable angle is arranged between the supporting column and the supporting frame, a movable seat which can move relative to the bottom wall of the hole is arranged on the swing arm frame, a water-grinding drill is arranged on the movable seat, top feet are arranged at both ends of the supporting column, the top feet are abutted against the side walls of the hole, and the supporting frame is abutted against the bottom wall of the hole, thereby solving the problem of pipe jacking construction being blocked by hard rock.

Description

Technical Field

[0001] The invention relates to the field of pipe jacking construction, and in particular to a hard rock drilling device and a drilling method based on a water-grinding drill. Background Art

[0002] In the urban modernization construction industry, in order to protect urban road construction from the impact of the surrounding environment and traffic safety, non-excavation technology is usually used in the construction of underground pipelines. That is, a hard pipe is passed under the soil layer to form water supply and drainage or other facilities. This technology does not require grooving for laying pipes.

[0003] However, encountering hard rock during the construction process often hinders the jacking construction, and additional drilling equipment is required to drill holes and excavate the rocks. Since such holes are generally static and blasting is used to blast the rocks, a construction device and method that can quickly break the hard rock is urgently needed. Summary of the invention

[0004] The invention provides a hard rock drilling device and a drilling method based on a water-grinding drill, which solves the problem that the top pipe excavation construction is blocked by hard rocks.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a hard rock drilling device based on a water-grinding drill, including a supporting column and a supporting leg, an angle-adjustable swing arm frame is provided between the supporting column and the supporting leg, a movable seat that can move relative to the bottom wall of the hole is provided on the swing arm frame, a water-grinding drill is provided on the movable seat, top feet are provided at both ends of the supporting column, the top feet rest on the side walls of the hole, and the supporting leg rests on the bottom wall of the hole.

[0006] In the preferred solution, a slidable slide is provided on the opposite side of the support column and the support leg, and the swing arm frame includes a central rotating shaft, and seat sleeves are provided at both ends of the central rotating shaft. Each seat sleeve is connected to each slide, and the central rotating shaft is rotatably sleeved with the seat sleeve.

[0007] In a preferred solution, the support bracket is further provided with a first rack, the slide seat is provided with a bayonet, the bayonet is threadedly connected to the slide seat, and a conical head is provided at the end of the bayonet for being stuck in the tooth gap of the first rack.

[0008] In a preferred embodiment, a plurality of swing arms are provided along the circumferential direction of the central rotating shaft, a second rack is provided on the swing arm, a first motor is provided on the movable seat, a driving gear is provided on the shaft section of the first motor, and the driving gear is meshed with the second rack.

[0009] In a preferred solution, the water-grinding drill includes a drill barrel device, which includes an outer drill barrel and an inner drill barrel that are coaxially sleeved, and a connecting frame is provided between the outer drill barrel and the inner drill barrel.

[0010] In a preferred embodiment, a first drill bit is provided at one end of the outer drill barrel, a second drill bit is provided at one end of the inner drill barrel, a gap cavity is provided between the first drill bit and the second drill bit, and a first cutting edge and a second cutting edge are provided on the inner wall of the first drill bit and the outer wall of the second drill bit in the gap cavity, respectively.

[0011] In a preferred embodiment, the connecting skeleton includes a skeleton rod arranged along the circumferential direction, and slip rings are connected to both ends of the skeleton rod. The inner wall of the slip ring is against the outer wall of the second drill pipe, and the outer wall of the slip ring is against the inner wall of the first drill pipe. The slip ring is provided with a plurality of through holes along the circumferential direction, and a supporting shoulder is provided at the end of the gap clamping cavity. One end of the connecting skeleton is against the supporting shoulder, and the through hole is connected with the gap clamping cavity. A positive pressure chamber is formed between the first drill pipe, the second drill pipe and the slip ring. A pipe joint is provided on the slip ring at the end of the connecting skeleton away from the first drill bit, and the pipe joint is connected with the positive pressure chamber. The pipe joint is used to introduce cutting lubricant; chip grooves are provided on the inner and outer walls of the first drill bit and the second drill bit, the outer diameter of the first drill bit is larger than the outer diameter of the first drill pipe, the inner diameter of the first drill bit is smaller than the inner diameter of the first drill pipe, the outer diameter of the second drill bit is larger than the outer diameter of the second drill pipe, and the inner diameter of the second drill bit is smaller than the inner diameter of the second drill pipe; a plurality of notches are provided at the ends of the first drill bit and the second drill bit along the circumferential direction.

[0012] In the preferred scheme, the water-grinding drill includes a base plate, a drill barrel device is rotatably connected to the base plate, a second large gear is connected to one end of the outer drill barrel, and a second small gear is connected to one end of the inner drill barrel. A rotatable transition shaft is provided on the base plate, and a first large gear and a first small gear are connected to the transition shaft. The first small gear is meshed with the second large gear, and the first large gear is meshed with the second small gear. A second motor is also provided on the base plate, and a synchronous belt device is connected between the second motor and the transition shaft.

[0013] In a preferred solution, a blocking ring is further provided at one end of the connecting frame close to the first drill bit, and a sinking groove is provided at one side of the blocking ring close to the through hole, and a plurality of through dispersed holes are provided in the sinking groove.

[0014] In the preferred embodiment,

[0015] Fix the supporting column and supporting bracket in the base hole;

[0016] Use a hand chain hoist to manually adjust the angle of the swing arm;

[0017] Start the water-grinding drill and begin drilling holes on the bottom wall of the hole to form annular gaps and stone pillars;

[0018] After drilling the previous hole, the water-grinding drill is reset, and the swing arm is rotated at a certain angle to drill the next hole, so that adjacent holes are separated by a certain distance to form a thin-walled spacer. After all holes are drilled, they are distributed circumferentially, and the central area is the central stone body;

[0019] A hydraulic rock splitter is inserted into the annular gap, with the split plate facing the stone column and the thin-walled spacer. Since the stone column is relatively thick, the split plate fractures the thin-walled spacer.

[0020] Fracture the thin-walled intervals to separate the central stone body;

[0021] Since the hollow part is left empty, the stone column can be broken or smashed with a hammer or a jackhammer to form the final hole.

[0022] The beneficial effects of the present invention are as follows: a swing arm frame is provided, which can drive the water-grinding drill to perform circumferential drilling, and the central stone body is separated from the surrounding rock bodies by wind, so that a hole with a larger diameter can be quickly drilled; the support column and the support foot frame can be quickly installed in the excavation hole in cooperation, and can adapt to different hole diameters, and a sliding seat is provided, and the swing arm frame can be adjusted to change the position of the water-grinding drill; the water-grinding drill can adopt a double-barrel type, and the inside and outside are drilled together, so that a single hole with a larger diameter can be quickly cut out and an annular gap can be formed. Adjacent single holes do not need to intersect, and only a thin-wall spacer portion is reserved, so that the thin wall can be directly crushed by a hydraulic splitter in the subsequent process, and there is no need for a pneumatic pick to break the stone and the subsequent stone removal, which greatly speeds up the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is an installation schematic diagram of the present invention.

[0025] Figure 2 It is a top view schematic diagram of the swing arm frame of the present invention.

[0026] Figure 3 It is a structural diagram of the slide locking of the present invention.

[0027] Figure 4 It is a schematic diagram of the construction process of the present invention.

[0028] Figure 5 This is a schematic diagram of the end of a pneumatic pick.

[0029] Figure 6 It is a schematic diagram of the driving structure of the double-barrel water-grinding drill of the present invention.

[0030] Figure 7 It is a schematic diagram of a drill tube device of the present invention.

[0031] Figure 8 It is an exploded view of the drill tube device of the present invention.

[0032] Fig. 9 It is a schematic diagram of the end of the drill tube device of the present invention.

[0033] Fig.10 It is a cross-sectional view of the end of the drill tube device of the present invention.

[0034] Fig.11 It is a schematic diagram of the outer drill tube end of the present invention.

[0035] Fig.12 It is a schematic diagram of the inner drill tube end of the present invention.

[0036] Fig.13 It is a schematic diagram of one end of the connection skeleton of the present invention.

[0037] Fig.14 It is a schematic diagram of the other end of the connection skeleton of the present invention.

[0038] In the figure: supporting column 1; top foot 101; supporting foot frame 2; sliding seat 201; first rack 202; bayonet 203; swing arm frame 3; seat sleeve 301; central rotating shaft 302; swing arm part 303; second rack 304; moving seat 4; first motor 401; driving gear 402; hand chain hoist 5; water grinding drill 6; base plate 601; second motor 602; drill tube device 603; transition shaft 604; first large gear 605; first small gear 606; second large gear 607; second small gear 608; synchronous belt device 609; outer drill tube 7 ; first drill bit 701; first drill tube 702; first cutting edge 703; abutting shoulder 704; connecting skeleton 8; skeleton rod 801; slip ring 802; through hole 803; blocking ring plate 804; sinking groove 805; dispersion hole 806; inner drill tube 9; second drill bit 901; second drill tube 902; second cutting edge 903; gap clamping cavity 904; base hole 10; hole bottom wall 1001; hole side wall 1002; pipe joint 11; mounting ring 1101; sealing groove 1102; stop ring 12; positive pressure chamber 13; chip removal groove 14; notch 15. DETAILED DESCRIPTION

[0039] Embodiment 1:

[0040] like Figure 1-14 In the invention, a hard rock drilling device based on a water-grinding drill is provided, comprising a supporting column 1 and a supporting frame 2, a swing arm frame 3 with an adjustable angle is provided between the supporting column 1 and the supporting frame 2, a movable seat 4 which can move relative to a hole bottom wall 1001 is provided on the swing arm frame 3, a water-grinding drill 6 is provided on the movable seat 4, top feet 101 are provided at both ends of the supporting column 1, the top feet 101 abut against a hole side wall 1002, and the supporting frame 2 abuts against the hole bottom wall 1001.

[0041] When constructing the base hole 10, if the bottom wall 1001 of the hole is hard rock, the drilling device is installed, the supporting bracket 2 and the supporting column 1 are arranged in parallel, the moving seat 4 moves to drive the water-grinding drill 6 to rest against the bottom wall 1001 of the hole, and the water-grinding drill 6 rotates to start drilling.

[0042] The water grinding drill 6 includes a base frame, a driving motor and a drill barrel. The base frame is connected to the movable seat 4. The driving motor is installed on the base frame and drives the drill barrel to rotate. When drilling, lubricating fluid is injected from the rear end of the drill barrel to cool the drill bit end of the drill barrel and facilitate chip removal.

[0043] In the preferred embodiment, a slidable slide 201 is provided on the opposite side of the support column 1 and the support leg 2, and the swing arm frame 3 includes a central rotating shaft 302, and seat sleeves 301 are provided at both ends of the central rotating shaft 302, each seat sleeve 301 is connected to each slide 201, and the central rotating shaft 302 is rotatably sleeved with the seat sleeve 301.

[0044] In a preferred embodiment, the support bracket 2 is further provided with a first rack 202 , and a bayonet 203 is provided on the slide 201 . The bayonet 203 is threadedly connected to the slide 201 , and a conical head is provided at the end of the bayonet 203 for being stuck in the tooth gap of the first rack 202 .

[0045] The swing arm frame 3 can move along the length direction of the first rack 202 to adjust the punching position. After the adjustment is completed, the bayonet pin 203 can be rotated, and the cone head of the bayonet pin 203 is inserted into the tooth gap to complete the positioning.

[0046] In the preferred embodiment, the central rotating shaft 302 is provided with multiple swing arm parts 303 along the circumferential direction, the swing arm parts 303 are provided with a second rack 304, the moving seat 4 is provided with a first motor 401, the shaft section of the first motor 401 is provided with a driving gear 402, and the driving gear 402 is meshed with the second rack 304.

[0047] The first motor 401 drives the moving seat 4 to move along the length direction of the second rack 304 to feed forward for punching. A hand chain hoist 5 is provided on the top of the support column 1, and an ear seat is provided on the swing arm 303. The hand chain hoist 5 can pull the swing arm 303 to adjust the rotation angle of the swing arm 303.

[0048] In a preferred solution, the water-grinding drill 6 includes a drill barrel device 603 , and the drill barrel device 603 includes an outer drill barrel 7 and an inner drill barrel 9 that are coaxially sleeved, and a connecting frame 8 is provided between the outer drill barrel 7 and the inner drill barrel 9 .

[0049] In the preferred embodiment, a first drill bit 701 is provided at one end of the outer drill barrel 7, a second drill bit 901 is provided at one end of the inner drill barrel 9, a gap cavity 904 is provided between the first drill bit 701 and the second drill bit 901, and a first cutting edge 703 and a second cutting edge 903 are provided on the inner wall of the first drill bit 701 and the outer wall of the second drill bit 901 in the gap cavity 904, respectively.

[0050] The connecting frame 8 is used to connect the outer drill tube 7 and the inner drill tube 9 together, and at the same time, a certain gap can be maintained between the first drill bit 701 and the second drill bit 901, so that the cutting area of ​​the annular structure is larger. The cutting edges of the inner wall of the first drill bit 701 and the outer wall of the second drill bit 901 can crush the rock mass entering the clamping cavity.

[0051] In a preferred embodiment, the connecting skeleton 8 includes a skeleton rod 801 arranged along the circumferential direction, and the two ends of the skeleton rod 801 are connected with a slip ring 802, the inner wall of the slip ring 802 is pressed against the outer wall of the second drill pipe 902, and the outer wall of the slip ring 802 is pressed against the inner wall of the first drill pipe 702. The slip ring 802 is provided with a plurality of through holes 803 along the circumferential direction, and the end of the gap clamping cavity 904 is provided with a shoulder 704. One end of the connecting skeleton 8 is pressed against the shoulder 704, and the through hole 803 is connected with the gap clamping cavity 904. A positive pressure chamber 13 is formed between the first drill pipe 702, the second drill pipe 902 and the slip ring 802, and the connecting skeleton 8 is away from the first drill bit. A pipe joint 11 is provided on the slip ring 802 at one end of 701, and the pipe joint 11 is connected to the positive pressure chamber 13, and the pipe joint 11 is used to introduce cutting lubricant; the inner and outer walls of the first drill bit 701 and the second drill bit 901 are provided with chip grooves 14, the outer diameter of the first drill bit 701 is larger than the outer diameter of the first drill pipe 702, the inner diameter of the first drill bit 701 is smaller than the inner diameter of the first drill pipe 702, the outer diameter of the second drill bit 901 is larger than the outer diameter of the second drill pipe 902, and the inner diameter of the second drill bit 901 is smaller than the inner diameter of the second drill pipe 902; a plurality of notches 15 are provided at the ends of the first drill bit 701 and the second drill bit 901 along the circumferential direction.

[0052] The sliding ring 802 is made of ceramic or Teflon materials with good wear resistance and low friction coefficient. In order to facilitate the installation of the pipe joint 11 and the sealing of the rear end of the clamping cavity, the mounting ring 1101 is installed at the rear end of the connecting frame 8, the sealing groove 1102 is processed on the inner and outer walls and the sealing ring is installed, and finally the stop ring 12 is sleeved to fix the rear end of the connecting frame 8 with the outer drill tube 7 and the inner drill tube 9. The end close to the shoulder 704 does not need to be sealed, but the positive pressure cutting lubricant is used to form an oil film from the inner and outer wall gaps of the sliding ring 802 to improve lubricity.

[0053] In the preferred embodiment, the water-grinding drill 6 includes a base plate 601, a drill barrel device 603 is rotatably connected to the base plate 601, a second large gear 607 is connected to one end of the outer drill barrel 7, and a second small gear 608 is connected to one end of the inner drill barrel 9. A rotatable transition shaft 604 is provided on the base plate 601, and a first large gear 605 and a first small gear 606 are connected to the transition shaft 604. The first small gear 606 is meshed with the second large gear 607, and the first large gear 605 is meshed with the second small gear 608. A second motor 602 is also provided on the base plate 601, and a synchronous belt device 609 is connected between the second motor 602 and the transition shaft 604.

[0054] The diameter of the first large gear 605 is greater than that of the first small gear 606, and the diameter of the second large gear 607 is greater than that of the second small gear 608. Therefore, when the second motor 602 drives the transition shaft 604 to rotate through the synchronous belt device 609, the rotation speed of the inner drill tube 9 is slightly greater than that of the outer drill tube 7. That is to say, there is a speed difference between the first drill bit 701 and the second drill bit 901. The stones crushed by the first cutting edge 703 and the second cutting edge 903 will not be stuck in the gap clamping cavity 904, but will enter the inner wall of the second drill bit 901 and the chip groove 14 of the outer wall of the first drill bit 701 from the notch 15 along the chip groove 14 in the gap clamping cavity 904 under the pressure of the positive pressure cutting lubricant as they move, and be discharged to the tail end. Since the outer diameter of the first drill pipe 702 is smaller than the outer diameter of the first drill bit 701, and the inner diameter of the second drill bit 901 is smaller than the inner diameter of the second drill pipe 902, the gap between the pipe body and the rock layer can be directly used to discharge chips to the tail end.

[0055] In addition, due to the brittleness of the rock, the relative displacement of the first drill bit 701 and the second drill bit 901 causes the thin-walled rock layer in the center to be pulled and torn, which facilitates the subsequent cutting by the first cutting edge 703 and the second cutting edge 903 .

[0056] In a preferred embodiment, a blocking ring 804 is further provided at one end of the connecting skeleton 8 close to the first drill bit 701 . The blocking ring 804 is provided with a sinking groove 805 on one side close to the through hole 803 . A plurality of through dispersed holes 806 are provided in the sinking groove 805 .

[0057] The external lubrication system fills the positive pressure chamber 13 with cutting lubricant through the pipe joint 11, and the cutting lubricant is introduced into the gap clamping chamber 904 through the sinking groove 805 and the dispersion hole 806. The dispersion hole 806 plays a filtering role, and under the positive pressure of the dispersion hole 806 and the cutting lubricant, rock particles will not enter the positive pressure chamber 13.

[0058] When drilling large holes with traditional water-grinding drills, adjacent holes need to overlap and intersect with each other, and a large number of holes need to be drilled. In addition, after the cylindrical drill tube is withdrawn, the root of the stone column is still connected to the rock mass, so it is often necessary to use a pneumatic drill to break the stone column from the outside to the inside, and then clean the stones in the hole. The process is cumbersome and the construction time is long.

[0059] Therefore, in the preferred embodiment,

[0060] Fix the support column 1 and the support bracket 2 in the base hole 10;

[0061] Manually adjust the angle of the swing arm frame 3 using the hand chain hoist 5;

[0062] The water-grinding drill 6 is started to drill holes on the bottom wall 1001 of the hole to form an annular gap and a stone column;

[0063] After drilling the previous hole, the water-grinding drill 6 is reset, and the swing arm 3 rotates a certain angle to drill the next hole, so that adjacent holes are separated by a distance to form a thin-walled spacer. After all holes are drilled, they are distributed circumferentially, and the central area is the central stone body;

[0064] A hydraulic rock fracturing machine is inserted into the annular gap. The hydraulic rock fracturing machine generally includes a wedge-shaped central plate and split plates on both sides. The central plate is driven forward by a hydraulic cylinder to open the split plates on both sides. The split plates face the stone pillars and the thin-walled partitions. Since the stone pillars are relatively thick, the split plates fracture the thin-walled partitions.

[0065] Fracture the thin-walled intervals to separate the central stone body;

[0066] Since the hollow part is left empty, the stone column can be broken or smashed with a hammer or a jackhammer to form the final hole.

[0067] Embodiment 2:

[0068] A drilling device for directional pipe jacking and a construction method thereof, comprising a gear support rod, a regulator, a regulating valve, a fixed connection sleeve, a horizontal support steel pipe, a gear transmission shaft, a reducer device, a motor, a reducer regulator, a threaded connection shaft, a core drilling tube, a drill bit, a hand chain hoist, a triangular hoist hook, and a buckle bracket. The upper and lower ends of the gear support rod are respectively provided with buckle brackets, a triangular hoist hook is provided below the buckle bracket at the upper end of the gear support rod, the triangular hoist hook is connected to the horizontal support steel pipe with a hand chain hoist, and a regulator is provided in the middle of the gear support rod.

[0069] By adopting the above technical solution, during use, by adjusting the height of the disc buckle bracket and fixing it, the gear support rod and the upper and lower side disc buckles are used as fixed supports, and the triangular hoist hook is connected to the gear support rod to form a force point.

[0070] A regulating valve is arranged behind the regulator in the middle, and a fixed connecting sleeve is arranged in front of the regulator in the middle.

[0071] By adopting the above technical solution, the regulating valve on the regulator drives the gear to adjust the height up and down, so that the center of the fixed connecting sleeve connected to the regulator is on the same horizontal plane with the laser projection reference line, thereby ensuring the excavation height.

[0072] The fixed connection sleeve is connected to the horizontal support steel pipe. A gear transmission shaft is arranged on one side of the horizontal support steel pipe, the gear transmission shaft is arranged parallel to the horizontal support steel pipe, and the gear transmission shaft and the horizontal support steel pipe are welded at 90 degrees with a steel pipe.

[0073] By adopting the above technical solution, during use, the horizontal supporting steel pipe is embedded in the fixed connecting sleeve on the regulator, and the gear transmission shaft and the horizontal supporting steel pipe are welded at 90 degrees with a steel pipe to form an integral device. Since the horizontal supporting steel pipe can rotate in the embedded fixed connecting sleeve, a device that can rotate with the horizontal supporting steel pipe as the axis is formed.

[0074] A reducer regulator is arranged in the middle of the gear transmission shaft, a regulating valve is arranged above the reducer regulator, and a reducer device is arranged below the reducer regulator, and the reducer regulator and the reducer device are connected and fixed by screws.

[0075] By adopting the above technical solution, the regulating valve on the reducer regulator drives the gear to make the reducer device and the coring drill barrel device connected to the gear transmission shaft move forward and backward along with the excavation depth.

[0076] As a preferred embodiment, a motor is arranged on the right side of the reducer device, and a threaded connecting shaft is arranged on the left side of the reducer device, the threaded connecting shaft is connected to the coring drill barrel, and the coring drill barrel is connected to the drill bit through a high-frequency induction heating welding machine.

[0077] By adopting the above technical solution, a motor is used to generate electricity to drive a reducer device, and a threaded shaft is used to drive the coring drill barrel to rotate, thereby enabling excavation.

[0078] In summary, the advantages and positive effects of the present invention are that, in the present invention, the axis of the tunnel is positioned and marked by a cross laser, the vertical center of the gear support rod is coincident with the laser projection reference line, and the gear support rod is fixedly supported by the upper and lower disc buckles to ensure that the axis of the tunnel and the gear support rod do not shift. The center of the fixed connection sleeve is coincident with the horizontal laser projection reference line and the regulating valve is fixed by adjusting the regulator up and down, and the horizontal support steel pipe (including excavation equipment) is embedded in the fixed connection sleeve at the same time, and the two gear support rods and the horizontal support steel pipe form a stable support system for excavation. The hand chain hoist is fixed to the steel pipe by the triangular hoist hook, and the hand chain hoist is adjusted to make the drill tube do radius excavation around the horizontal support steel pipe up and down, ensuring the linear shape of the arc in the tunnel, and the gear is driven to adjust the height up and down by adjusting the regulating valve on the rear gear support rod, so that the fixed connection sleeves on the front and rear regulators form a height difference, ensuring the slope of excavation. It provides favorable guarantees for the construction of directional jacking excavation.

[0079] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A hard rock drilling device based on a water-grinding drill, characterized by: It comprises a supporting column (1) and a supporting stand (2), wherein an angle-adjustable swing arm frame (3) is provided between the supporting column (1) and the supporting stand (2), a movable seat (4) movable relative to a hole bottom wall (1001) is provided on the swing arm frame (3), a water-grinding drill (6) is provided on the movable seat (4), top feet (101) are provided at both ends of the supporting column (1), the top feet (101) abut against a hole side wall (1002), and the supporting stand (2) abuts against the hole bottom wall (1001); The water-grinding drill (6) includes a drill tube device (603), the drill tube device (603) includes an outer drill tube (7) and an inner drill tube (9) which are coaxially sleeved, and a connecting frame (8) is provided between the outer drill tube (7) and the inner drill tube (9); A first drill bit (701) is provided at one end of the outer drill tube (7), a second drill bit (901) is provided at one end of the inner drill tube (9), a gap cavity (904) is provided between the first drill bit (701) and the second drill bit (901), and a first cutting edge (703) and a second cutting edge (903) are provided on the inner wall of the first drill bit (701) and the outer wall of the second drill bit (901) in the gap cavity (904), respectively; The connecting frame (8) comprises a frame rod (801) arranged along the circumferential direction, and the two ends of the frame rod (801) are connected with a slip ring (802), the inner wall of the slip ring (802) is pressed against the outer wall of the second drill pipe (902), and the outer wall of the slip ring (802) is pressed against the inner wall of the first drill pipe (702), and the slip ring (802) is provided with a plurality of through holes (803) along the circumferential direction, and the end of the gap clamping cavity (904) is provided with a supporting shoulder (704), one end of the connecting frame (8) is pressed against the supporting shoulder (704), and the through hole (803) is communicated with the gap clamping cavity (904), and a positive pressure chamber (13) is formed between the first drill pipe (702), the second drill pipe (902) and the slip ring (802), and the connecting frame (8) is away from the first drill bit (70 A pipe joint (11) is provided on the slip ring (802) at one end of the first drill bit (701), the pipe joint (11) is in communication with the positive pressure chamber (13), and the pipe joint (11) is used to introduce cutting lubricant; the inner and outer walls of the first drill bit (701) and the second drill bit (901) are provided with chip removal grooves (14); the outer diameter of the first drill bit (701) is greater than the outer diameter of the first drill tube (702), the inner diameter of the first drill bit (701) is smaller than the inner diameter of the first drill tube (702), the outer diameter of the second drill bit (901) is greater than the outer diameter of the second drill tube (902), and the inner diameter of the second drill bit (901) is smaller than the inner diameter of the second drill tube (902); and a plurality of notches (15) are provided at the ends of the first drill bit (701) and the second drill bit (901) along the circumferential direction.

2. The hard rock drilling device based on a water-grinding drill according to claim 1 is characterized in that: A slidable slide seat (201) is provided on the opposite side of the support column (1) and the support foot frame (2). The swing arm frame (3) comprises a central rotating shaft (302). Seat covers (301) are provided at both ends of the central rotating shaft (302). Each seat cover (301) is connected to each slide seat (201). The central rotating shaft (302) and the seat cover (301) are rotatably sleeved.

3. The hard rock drilling device based on a water-grinding drill according to claim 2 is characterized in that: The supporting leg (2) is further provided with a first rack (202), and the slide seat (201) is provided with a latch pin (203), the latch pin (203) is threadedly connected to the slide seat (201), and a cone head is provided at the end of the latch pin (203), and the cone head is used to be latched in the tooth gap of the first rack (202).

4. The hard rock drilling device based on a water-grinding drill according to claim 2 is characterized in that: The central rotating shaft (302) is provided with a plurality of swing arm parts (303) along the circumferential direction, the swing arm parts (303) are provided with a second rack (304), the moving seat (4) is provided with a first motor (401), the shaft section of the first motor (401) is provided with a driving gear (402), and the driving gear (402) is meshed with the second rack (304).

5. The hard rock drilling device based on a water-grinding drill according to claim 1 is characterized in that: The water grinding drill (6) comprises a base plate (601), a drill tube device (603) rotatably sleeved with the base plate (601), a second large gear (607) sleeved on one end of the outer drill tube (7), a second small gear (608) sleeved on one end of the inner drill tube (9), a rotatable transition shaft (604) is provided on the base plate (601), a first large gear (605) and a first small gear (606) are sleeved on the transition shaft (604), the first small gear (606) meshes with the second large gear (607), and the first large gear (605) meshes with the second small gear (608), a second motor (602) is further provided on the base plate (601), and a synchronous belt device (609) is connected between the second motor (602) and the transition shaft (604).

6. The hard rock drilling device based on a water-grinding drill according to claim 5 is characterized in that: A blocking ring piece (804) is also provided at one end of the connecting frame (8) close to the first drill bit (701), and a sinking groove (805) is provided on one side of the blocking ring piece (804) close to the through hole (803), and a plurality of through dispersed holes (806) are provided in the sinking groove (805).

7. The drilling method of the hard rock drilling device based on the water-grinding drill according to claim 5 is characterized by: Fixing the supporting column (1) and the supporting bracket (2) in the base hole (10); Manually adjust the angle of the swing arm frame (3) using a hand chain hoist (5); Start the water-grinding drill (6) to start drilling holes on the bottom wall (1001) of the hole to form an annular gap and a stone column; After drilling the previous hole, the water-grinding drill (6) is reset, and the swing arm (3) is rotated at a certain angle to drill the next hole, so that adjacent holes are spaced a certain distance apart to form a thin-walled spacer. After drilling all the holes, they are distributed in a circumferential direction, and the central area is the central stone body. A hydraulic rock splitter is inserted into the annular gap, with the split plate facing the stone column and the thin-walled spacer. Since the stone column is relatively thick, the split plate fractures the thin-walled spacer. Fracture the thin-walled intervals to separate the central stone body; Break each stone pillar to form the final hole.

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