Drilling tool for grouting, slope fixing and supporting
Through the drilling tool design that integrates the drive rod and grouting pipe assembly, the problem of hole collapse when drilling branch wells in loose soil is solved, the integration of branch hole drilling and grouting is achieved, the hole formation rate and grouting effect are improved, and the safe and efficient mining of rare earth mine slopes is ensured.
Patent Information
- Application Number
- CN202510916786.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-03
- Publication Date
- 2025-09-16
AI Technical Summary
When traditional drilling tools are used to drill branch wells in loose soil, it is difficult for the well wall to form an effective support structure, resulting in rapid collapse after the hole is formed. The grouting channel cannot remain intact, seriously affecting the safe and efficient mining of the ionic rare earth mine slope.
A drilling tool consisting of a main drill rod, a driving rod, a grouting pipe assembly and a branch drill bit was designed. By integrating the driving rod and the grouting pipe assembly into the main drill rod, the drilling, support and grouting of the branch holes were integrated. The eccentric arrangement of the grouting pipe assembly and the tilting of the branch drill bit were used to ensure the stability of the well wall during the drilling process. After drilling was completed, slurry was injected in time to fill the gaps in the well wall.
It effectively prevents branch well collapse, improves the porosity, ensures the integrity of the grouting channel, improves the grouting slope consolidation effect of branch wells in loose soil, and ensures the safety and efficiency of rare earth mining.
Smart Images
Figure CN120649804A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of grouting support, in particular to a drilling tool used for grouting slope consolidation support. Background Art
[0002] Ionic rare earth ores, typical weathering crust leaching rare earth minerals, are strategic resources supporting high-end manufacturing. Their mining relies primarily on in-situ leaching. However, the ammonium sulfate solution used in this process has strong ion exchange properties. During penetration into the ore body, it significantly weakens the cementation between ore particles, leading to a sharp decrease in the shear strength of the slope soil. This deterioration in geomechanical properties leaves the mining area in a state of critical instability for a long time, making it highly susceptible to large-scale landslides. This not only results in irreversible loss of rare earth resources but also poses the risk of serious production accidents.
[0003] Currently, the main method for reinforcing slopes along ionic rare earth mines is branch well grouting, which strengthens the soil's integrity by constructing a grouting network within the slope. However, conventional drilling tools face fundamental limitations when drilling branch wells: the loose soil, disturbed by drill bit vibration and circulating flushing fluid, makes it difficult for the wellbore to form an effective support structure. This leads to rapid collapse of the wellbore after drilling, and the grouting channel cannot remain intact. Especially during drill withdrawal, the wellbore's soil is more susceptible to instability and collapse after losing the radial restraint of the drill pipe, preventing the slurry from penetrating and consolidating the target area along the designed path. While existing technologies have attempted to optimize drill tool structure or adjust grouting timing, they have failed to address the "hole-to-hole collapse" time conflict: the inevitable structural collapse of the branch well between the completion of drilling and the start of grouting. This critical flaw has long rendered branch well grouting in loose soils ineffective, severely hindering the safe and efficient mining of ionic rare earth ores. Summary of the Invention
[0004] The purpose of the present invention is to provide a drilling tool for grouting slope reinforcement and support, which solves the problem of poor drilling effect of branch wells in loose soil.
[0005] The present invention is achieved through the following technical solutions: a drilling tool for grouting and slope support, including a main drill rod, a branch drill assembly is provided in the main drill rod, the branch drill assembly includes a driving rod, a grouting pipe assembly and a branch drill bit, a through hole for the branch drill bit to extend out is provided on the side wall of the main drill rod, the driving rod is coaxially connected to the main drill rod through a bracket, one end of the driving rod is connected to a driving motor through a coupling, and the other end of the driving rod is rotatably connected to the branch drill bit through a universal joint, the grouting pipe assembly is eccentrically arranged in the main drill rod for pulling the branch drill bit to tilt toward the through hole, and the grouting pipe assembly is connected to the end of the branch drill bit.
[0006] Furthermore, the grouting pipe assembly includes a first connecting pipe, a second connecting pipe and a third connecting pipe. The first connecting pipe slides axially through a slide groove set on the inner wall of the main drill pipe. One end of the second connecting pipe is hinged to the first connecting pipe, and the other end of the second connecting pipe is limitedly slidably connected to the third connecting pipe. Grouting hoses are provided in the first connecting pipe, the second connecting pipe and the third connecting pipe, and one end of the grouting hose is fixed to the third connecting pipe.
[0007] Furthermore, the branch drill bit includes an inner tube, one end of the inner tube is connected to the universal joint, the other end of the inner tube is connected to a bellows, the outer side of the inner tube is sealed and rotatably connected to a grouting ring, the grouting ring is provided with an annular groove connected to the grouting hose, and the inner tube is provided with a connecting hole for connecting the annular groove and the bellows.
[0008] Furthermore, the top end of the first connecting pipe extends beyond the main drill rod, and the main drill rod is provided with a locking clamp for clamping and fixing the first connecting pipe.
[0009] Furthermore, the branch drill bit includes, from the outside to the inside, a first telescopic cylinder, a second telescopic cylinder, a third telescopic cylinder, a fourth telescopic cylinder and an inner tube. The outer walls of the first telescopic cylinder, the second telescopic cylinder, the third telescopic cylinder and the fourth telescopic cylinder are all provided with spiral blades, and the inner walls of the first telescopic cylinder, the second telescopic cylinder and the third telescopic cylinder are all provided with spiral grooves that slide with the spiral blades. The first telescopic cylinder is sleeved on the outside of the inner tube, the outer thread of the inner tube is connected to the first guide block, the second telescopic cylinder is rotatably connected to the outside of the first guide block, the first guide block is connected to the first screw threaded with the inner tube, the first screw is externally threaded with the second guide block, the third telescopic cylinder is rotatably connected to the outside of the second guide block, the second guide block is connected to the second screw threaded with the first screw, the second screw is externally threaded with the third guide block, and the fourth telescopic cylinder is rotatably connected to the outside of the third guide block.
[0010] Furthermore, the inner tube, the first screw and the second screw ends are all provided with stop grooves.
[0011] Furthermore, the spiral blades on the outside of the first telescopic cylinder are in clearance fit with the inner wall of the main drill rod.
[0012] Furthermore, the bracket includes a limiting ring, and the limiting ring is provided with connecting ribs connected to the inner wall of the main drill pipe at even intervals in the circumferential direction. The driving rod is provided with a clamping ring that movably abuts against the limiting ring.
[0013] The present invention has at least the following advantages and beneficial effects: by integrating the driving rod, grouting pipe assembly and branch drill bit into the main drill rod, the branch hole drilling, support and grouting are integrated, which effectively prevents hole collapse and improves the hole formation rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a structural schematic diagram of a drilling tool for grouting slope support provided by the present invention.
[0015] Figure 2 The present invention provides a cross-sectional view of a drilling tool for grouting and slope consolidation support.
[0016] Figure 3 The present invention provides a cross-sectional view of a branch drill bit in a drilling tool for grouting and slope consolidation support.
[0017] Figure 4 For the present invention Figure 3 A partial enlarged view of point A in the middle.
[0018] Figure 5 The present invention provides a cross-sectional view of a grouting pipe assembly in a drilling tool for grouting slope reinforcement.
[0019] Figure markings: 1-main drill rod, 10-through hole, 11-bracket, 2-branch drill assembly, 3-driving rod, 31-universal joint, 4-grouting pipe assembly, 41-first connecting pipe, 42-second connecting pipe, 43-third connecting pipe, 5-branch drill bit, 51-first telescopic cylinder, 52-second telescopic cylinder, 53-third telescopic cylinder, 54-fourth telescopic cylinder, 55-inner tube, 550-connecting hole, 56-bellows, 57-grouting ring, 570-annular groove, 500-spiral slide groove, 501-spiral blade, 61-first guide block, 62-second guide block, 63-third guide block, 71-first screw, 72-second screw. DETAILED DESCRIPTION
[0020] The following is a detailed description of the embodiments with reference to the accompanying drawings.
[0021] Example like Figures 1 to 5As shown, in this embodiment, a drilling tool for grouting and slope reinforcement is mainly disclosed, including a main drill rod 1, a branch drill assembly 2 is provided in the main drill rod 1, the branch drill assembly 2 includes a drive rod 3, a grouting pipe assembly 4 and a branch drill bit 5, a through hole 10 for the branch drill bit 5 to extend is provided on the side wall of the main drill rod 1, the drive rod 3 is coaxially connected to the main drill rod 1 through a bracket 11, one end of the drive rod 3 is connected to a drive motor through a coupling, and the other end of the drive rod 3 is rotatably connected to the branch drill bit 5 through a universal joint 31, the grouting pipe assembly 4 is eccentrically arranged in the main drill rod 1 for pulling the branch drill bit 5 toward the through hole 10, and the grouting pipe assembly 4 is connected to the end of the branch drill bit 5. Specifically, the universal joint 31 includes a first joint portion connected to the drive rod 3 and a second joint portion connected to the top of the branch drill bit 5, the first joint portion and the second joint portion are connected by a ball joint structure, and the center of the ball joint structure is located on the axis of the through hole 10. After the main drill rod 1 reaches the predetermined depth, the grouting pipe assembly 4 is pulled upwards to rotate the branch drill bit 5 around the universal joint 31. The extension line of the branch drill bit 5 tilts outward through the through hole 10, and the drive motor transmits torque through the drive rod 3 and the universal joint 31 to drill the branch hole. During the drilling process, the grouting pipe assembly 4 is used to continuously introduce flushing fluid, and the drilled soil particles are carried to the ground along with the flushing fluid through the outer wall of the branch drill bit 5 and the outer wall of the main drill rod 1. After the branch hole is drilled, slurry is injected into the branch hole through the grouting pipe assembly 4, and the grouting pipe assembly 4 is pushed downwards to retract the branch drill bit 5 into the main drill rod 1 to complete the grouting. After the grouting is completed, air is introduced to discharge the remaining slurry to prevent blockage. This realizes the integration of branch hole drilling, support and grouting, effectively prevents hole collapse, and improves the hole success rate.
[0022] Furthermore, in a specific implementation, the grouting pipe assembly 4 provided in the embodiment of the present invention includes a first connecting pipe 41, a second connecting pipe 42, and a third connecting pipe 43. The first connecting pipe 41 slides axially through a slide groove provided on the inner wall of the main drill pipe 1. One end of the second connecting pipe 42 is hinged to the first connecting pipe 41, and the other end of the second connecting pipe 42 is limitedly slidably connected to the third connecting pipe 43. Grouting hoses are provided in the first connecting pipe 41, the second connecting pipe 42, and the third connecting pipe 43, and one end of the grouting hose is fixed to the third connecting pipe 43. Specifically, the first connecting pipe 41, the second connecting pipe 42, and the third connecting pipe 43 are all made of hard pipe fittings, which provide rigid support for the grouting hose and play a guiding and protective role. The end of the third connecting pipe 43 is L-shaped, and its protrusion is limited between the limit rings provided at both ends of the inner wall of the second connecting pipe 42. There is a certain amount of movable expansion and contraction between the second connecting pipe 42 and the third connecting pipe 43, which facilitates the rotation of the branch drill bit 5. When the branch drill bit 5 is in the extreme tilt position, the end of the third connecting tube 43 abuts against the limiting ring of the second connecting tube 42 near the hinge position. At the same time, the branch drill bit 5 abuts against the upper edge of the through hole 10, fixing the relative position of the grouting pipe assembly 4, that is, locking the tilt angle of the branch drill bit 5. When the branch drill bit 5 is coaxially arranged with the main drill pipe 1, the end of the third connecting tube 43 abuts against the limiting ring of the second connecting tube 42 away from the hinge position.
[0023] Furthermore, in a specific implementation, the branch drill bit 5 provided in the embodiment of the present invention includes an inner tube 55, one end of the inner tube 55 is connected to the universal joint 31, the other end of the inner tube 55 is connected to the bellows 56, and the outer portion of the inner tube 55 is sealed and rotatably connected to a grouting ring 57. The grouting ring 57 is provided with an annular groove 570 connected to the grouting hose, and the inner tube 55 is provided with a connecting hole 550 for connecting the annular groove 570 and the bellows 56. Specifically, the sealed rotatable connection between the grouting ring 57 and the inner tube 55 ensures that the grouting ring 57 can remain relatively stationary when the inner tube 55 rotates, and ensures the sealing of the grouting channel, so that the grouting hose is always connected to the bellows 56. A plurality of connecting holes 550 are evenly spaced along the axial direction of the inner tube 55. The annular groove 570 structure allows the grouting liquid to be evenly distributed to each connecting hole 550, thereby improving the uniformity of grouting.
[0024] Furthermore, in a specific implementation, the top end of the first connecting tube 41 provided in this embodiment of the present invention extends beyond the main drill pipe 1, and the main drill pipe 1 is provided with a locking clamp for clamping and securing the first connecting tube 41. Specifically, the horizontal line connecting the axis of the first connecting tube 41 and the axis of the main drill pipe 1 coincides with the horizontal line connecting the axis of the main drill pipe 1 and the vertical centerline of the through hole 10, ensuring that the branch drill bit 5 can be smoothly pulled out of the through hole 10 without interfering with the through hole 10. One end of the locking clamp is fixed to the outer wall of the drill pipe, and the other end is a pipe clamp structure connected by bolts, which stably clamps the outer wall of the first connecting tube 41.
[0025] Furthermore, in a specific implementation, the branch drill bit 5 provided in the embodiment of the present invention includes, from the outside to the inside, a first telescopic cylinder 51, a second telescopic cylinder 52, a third telescopic cylinder 53, a fourth telescopic cylinder 54 and an inner tube 55. The outer walls of the first telescopic cylinder 51, the second telescopic cylinder 52, the third telescopic cylinder 53 and the fourth telescopic cylinder 54 are all provided with spiral blades 501, and the inner walls of the first telescopic cylinder 51, the second telescopic cylinder 52 and the third telescopic cylinder 53 are all provided with spiral grooves 500 that slide with the spiral blades 501. The inner tube 55 is sleeved onto the outside of the inner tube 55, which is externally threaded with a first guide block 61. The second telescopic cylinder 52 is rotatably connected to the outside of the first guide block 61. The first guide block 61 is connected to a first screw 71 threadedly connected to the inner tube 55, and the first screw 71 is externally threadedly connected to the second guide block 62. The third telescopic cylinder 53 is rotatably connected to the outside of the second guide block 62. The second guide block 62 is connected to a second screw 72 threadedly connected to the first screw 71, and the second screw 72 is externally threadedly connected to the third guide block 63. The fourth telescopic cylinder 54 is rotatably connected to the outside of the third guide block 63. Specifically, the stepwise extension structure of the first, second, third, and fourth telescopic cylinders 51, 52, 53, and 54 synchronously supports the branch wellbore wall during drilling. Initially, the telescopic cylinders are retracted and stored within the main drill pipe 1, in a coaxially retracted state. During the extension process, the drive motor drives the drive rod 3 to rotate via the coupling, and the rotation is transmitted to the inner tube 55 via the universal joint 31. The rotation of the inner tube 55 drives the first guide block 61 and the first screw 71 to rotate synchronously, causing the first guide block 61 to move linearly along the inner tube 55, thereby prompting the second telescopic cylinder 52 to rotate and extend along the spiral groove 500 in the first telescopic cylinder 51. The rotation of the first screw 71 drives the second guide block 62 and the second screw 72 to rotate synchronously, causing the second guide block 62 to move linearly along the first screw 71, thereby prompting the third telescopic cylinder 53 to rotate and extend along the spiral groove 500 in the second telescopic cylinder 52. The rotation of the second screw 72 drives the third guide block 63 to rotate synchronously, causing the third guide block 63 to move linearly along the second screw 72, thereby prompting the fourth telescopic cylinder 54 to rotate and extend along the spiral groove 500 in the third telescopic cylinder 53. This enables the branch drill bit 5 to extend while rotating and drilling. After drilling is complete, the drive motor controls the reverse rotation of the drive rod 3, causing the inner tube 55, first screw 71, and second screw 72 to reverse direction, and the guide blocks at each stage to move axially toward the main drill pipe 1. Driven by the guide blocks, the telescopic cylinder contracts in the opposite direction along the spiral chute 500. At this time, the grouting pipe assembly 4 introduces slurry into the branch drill bit 5. The slurry flows out of the grouting outlet through the bellows 56, filling the space left by the retracted telescopic cylinder. The retraction speed of the telescopic cylinder is linked to the grouting pressure (for example, at a retraction speed of 50 mm / min, the grouting pressure is maintained at 2 MPa), ensuring that the slurry promptly fills the gap between the wellbore wall and the drill string, preventing the wellbore wall from collapsing due to loss of support.
[0026] Furthermore, in a specific implementation, the ends of the inner tube 55, the first screw 71 and the second screw 72 provided in the embodiment of the present invention are provided with stop grooves for respectively limiting the extreme positions of the outward extension direction of the first guide block 61, the second guide block 62 and the third guide block 63.
[0027] Furthermore, in a specific implementation, the spiral blades 501 on the exterior of the first telescopic cylinder 51 provided in this embodiment of the present invention are loosely coupled with the inner wall of the main drill pipe 1. During the branch hole drilling process, some mud enters the main drill pipe 1, and the branch drill bit 5 further rotates in the opposite direction at high speed within the main drill pipe 1, lifting the mud from the main drill pipe 1 to the surface.
[0028] Furthermore, in a specific implementation, the bracket 11 provided in this embodiment of the present invention includes a retaining ring having connecting ribs evenly spaced around the circumference thereof, which connect to the inner wall of the main drill pipe 1. A retaining ring is mounted on the drive rod 3 and movably engages the retaining ring. Specifically, the connecting ribs create a gap between the retaining ring and the inner wall of the main drill pipe 1, facilitating the lifting of mud.
Claims
1. A drilling tool for grouting slope support, characterized in that: The invention comprises a main drill rod (1), wherein a branch drill assembly (2) is provided in the main drill rod (1), wherein the branch drill assembly (2) comprises a driving rod (3), a grouting pipe assembly (4) and a branch drill bit (5), a through hole (10) for the branch drill bit (5) to extend is provided on the side wall of the main drill rod (1), the driving rod (3) is coaxially rotatably connected to the main drill rod (1) through a bracket (11), one end of the driving rod (3) is connected to a driving motor through a coupling, and the other end of the driving rod (3) is rotatably connected to the branch drill bit (5) through a universal joint (31), the grouting pipe assembly (4) is eccentrically arranged in the main drill rod (1) for pulling the branch drill bit (5) to tilt toward the through hole (10), and the grouting pipe assembly (4) is connected to the end of the branch drill bit (5).
2. A drilling tool for grouting slope support according to claim 1, characterized in that: The grouting pipe assembly (4) comprises a first connecting pipe (41), a second connecting pipe (42) and a third connecting pipe (43); the first connecting pipe (41) slides axially through a sliding groove provided on the inner wall of the main drill pipe (1); one end of the second connecting pipe (42) is hinged to the first connecting pipe (41); the other end of the second connecting pipe (42) is connected to the third connecting pipe (43) in a limited sliding manner; a grouting hose is provided in the first connecting pipe (41), the second connecting pipe (42) and the third connecting pipe (43); one end of the grouting hose is fixed to the third connecting pipe (43).
3. A drilling tool for grouting slope support according to claim 2, characterized in that: The branch drill bit (5) comprises an inner tube (55), one end of the inner tube (55) is connected to the universal joint (31), the other end of the inner tube (55) is connected to a bellows (56), the outer seal of the inner tube (55) is connected to a grouting ring (57) in a rotatable manner, the grouting ring (57) is provided with an annular groove (570) in communication with the grouting hose, and the inner tube (55) is provided with a connecting hole (550) for connecting the annular groove (570) and the bellows (56).
4. The drilling tool for grouting slope support according to claim 2, characterized in that: The top end of the first connecting tube (41) extends beyond the main drill rod (1), and a locking clamp for clamping and fixing the first connecting tube (41) is provided on the main drill rod (1).
5. The drilling tool for grouting slope support according to claim 1, characterized in that: The branch drill bit (5) comprises, from outside to inside, a first telescopic cylinder (51), a second telescopic cylinder (52), a third telescopic cylinder (53), a fourth telescopic cylinder (54) and an inner tube (55); the outer walls of the first telescopic cylinder (51), the second telescopic cylinder (52), the third telescopic cylinder (53) and the fourth telescopic cylinder (54) are all provided with spiral blades (501); and the inner walls of the first telescopic cylinder (51), the second telescopic cylinder (52) and the third telescopic cylinder (53) are all provided with spiral grooves (500) that slide with the spiral blades (501); the first telescopic cylinder (51) is sleeved on the outside of the inner tube (55); and the inner tube ( 55) is externally threadedly connected to a first guide block (61), the second telescopic cylinder (52) is rotatably connected to the outside of the first guide block (61), the first guide block (61) is connected to a first screw rod (71) threadedly connected to the inner tube (55), the first screw rod (71) is externally threadedly connected to a second guide block (62), the third telescopic cylinder (53) is rotatably connected to the outside of the second guide block (62), the second guide block (62) is connected to a second screw rod (72) threadedly connected to the first screw rod (71), the second screw rod (72) is externally threadedly connected to the third guide block (63), and the fourth telescopic cylinder (54) is rotatably connected to the outside of the third guide block (63).
6. The drilling tool for grouting slope support according to claim 5, characterized in that: The ends of the inner tube (55), the first screw (71) and the second screw (72) are all provided with stop grooves.
7. The drilling tool for grouting slope support according to claim 5, characterized in that: The spiral blade (501) outside the first telescopic cylinder (51) is in clearance fit with the inner wall of the main drill rod (1).
8. The drilling tool for grouting slope support according to claim 1, characterized in that: The bracket (11) includes a limiting ring, and the limiting ring is provided with connecting ribs connected to the inner wall of the main drill rod (1) at even intervals in the circumferential direction. The driving rod (3) is sleeved with a clamping ring that movably abuts against the limiting ring.