Guiding shaft and its rock anchor hole drilling tool

Abstract

The application discloses a guide shaft and a rock anchor hole drilling tool thereof. The rock anchor hole drilling tool comprises a drill bit, a guide shaft connected with the drill bit, and a double-wall drill rod fixedly connected with one end of the guide shaft away from the drill bit. The guide shaft comprises a guide outer cylinder, a connecting inner cylinder and a transmission shaft. The connecting inner cylinder is completely located in the guide outer cylinder, and the connecting inner cylinder and the guide outer cylinder are rotationally connected and concentrically arranged. Part of the transmission shaft is located in the guide outer cylinder. The part of the transmission shaft located in the guide outer cylinder is connected with the connecting inner cylinder, and the part of the transmission shaft located outside the guide outer cylinder is connected with the drill bit. A first target is arranged in the connecting inner cylinder, and the center of the first target coincides with the center of the connecting inner cylinder. The double-wall drill rod comprises an inner drill rod and an outer drill rod which are movably connected and concentrically arranged. The inner drill rod serves as an optical measurement channel. The annular space between the inner drill rod and the outer drill rod serves as an annular fluid channel. The rock anchor hole drilling tool and the guide shaft thereof can timely measure and correct deviation during the drilling of the guide hole, so that the inclination deviation of the rock anchor hole is not greater than 0.5%.

Description

Technical Field

[0001] This specification relates to the field of drilling technology, and in particular to a guide shaft and its rock anchor hole drilling tool. Background Technology

[0002] Anchor holes are drilled for installing anchor bolts or cables during anchoring projects on bridges, unstable rocks, and building components. During the drilling process, due to the inclined drilling angle and harsh working environment, the accuracy of the drilled anchor holes is often low, especially the inclination deviation, which cannot be controlled within a small range. Summary of the Invention

[0003] In view of the shortcomings of the prior art, one object of this specification is to provide a guide shaft and its rock anchor hole drilling tool, which can measure and correct deviation in a timely manner during the drilling of the guide hole, so that the inclination deviation of the rock anchor hole is no more than 0.5%.

[0004] To achieve the above objectives, this specification provides a rock anchor hole drilling tool, comprising:

[0005] drill;

[0006] A guide shaft connected to the drill bit includes an outer guide cylinder, a connecting inner cylinder, and a drive shaft. The connecting inner cylinder is completely located inside the outer guide cylinder, and the connecting inner cylinder and the outer guide cylinder are rotatably connected and concentrically arranged. Part of the drive shaft is located inside the outer guide cylinder, and the remaining drive shaft is located outside the outer guide cylinder. The portion of the drive shaft located inside the outer guide cylinder is connected to the connecting inner cylinder, and the portion of the drive shaft located outside the outer guide cylinder is connected to the drill bit. A first target is provided inside the connecting inner cylinder, and the center of the first target coincides with the center of the connecting inner cylinder.

[0007] A double-walled drill rod is fixedly connected to the end of the guide shaft away from the drill bit. The double-walled drill rod includes an inner drill rod and an outer drill rod that are movably connected and concentrically arranged. The inner drill rod is hollow and serves as an optical measurement channel. The annulus between the inner and outer drill rods serves as an annular fluid channel. The inner drill rod and the connecting inner cylinder are fixedly connected and concentrically arranged. The outer drill rod and the guide outer cylinder are fixedly connected and concentrically arranged. The end of the outer drill rod away from the guide shaft is used to connect to a first power component, and the end of the inner drill rod away from the guide shaft is used to connect to a second power component. The diameter of the drill bit is larger than the diameter of the outer drill rod.

[0008] In a preferred embodiment, the drive shaft is connected to the connecting inner cylinder via a universal joint.

[0009] In a preferred embodiment, an installation cylinder is fixedly provided at one end of the inner connecting cylinder near the drive shaft, and the first target is fixedly installed inside the installation cylinder; the first target is set as a lamp target.

[0010] In a preferred embodiment, a second target is provided inside the connecting inner cylinder, the center of the second target coinciding with the center of the connecting inner cylinder; the second target is located on the side of the first target away from the drive shaft.

[0011] In a preferred embodiment, the second target is configured as a prism target, with a prism fixedly mounted on the side of the second target away from the first target.

[0012] In a preferred embodiment, the guide outer cylinder and the connecting inner cylinder are rotatably connected via a first bearing; the outer drill rod and the inner drill rod are rotatably connected via a second bearing.

[0013] In a preferred embodiment, the second bearing includes a plurality of steel balls arranged circumferentially; the outer drill rod has two sealable inlets in the axial direction for mounting the second bearing.

[0014] In a preferred embodiment, the rock anchor hole drill bit includes a plurality of double-walled drill rods, with a centralizer provided between adjacent double-walled drill rods, and the diameter of the drill bit is larger than the diameter of the centralizer.

[0015] In a preferred embodiment, the rock anchor hole drill has a drilling state and a correction state. When the rock anchor hole drill is in the drilling state, both the first power component and the second power component are activated, and the outer drill rod and the inner drill rod are driven to rotate respectively. When the rock anchor hole drill is in the correction state, the first power component is deactivated, the second power component is activated, the outer drill rod stops rotating, and the inner drill rod continues to rotate.

[0016] This specification provides a guide shaft for a rock anchor hole drill bit, comprising: a guide outer cylinder, a connecting inner cylinder, and a drive shaft. The connecting inner cylinder is completely located inside the guide outer cylinder, and the connecting inner cylinder and the guide outer cylinder are rotatably connected and concentrically arranged. Part of the drive shaft is located inside the guide outer cylinder, and the remainder of the drive shaft is located outside the guide outer cylinder. The portion of the drive shaft located inside the guide outer cylinder is connected to the connecting inner cylinder, and the portion of the drive shaft located outside the guide outer cylinder is used to connect to a drill bit. A first target is provided inside the connecting inner cylinder, and the center of the first target coincides with the center of the connecting inner cylinder. The end of the guide outer cylinder away from the drive shaft is used to connect to a first power component, and the end of the connecting inner cylinder away from the drive shaft is used to connect to a second power component. Beneficial effects

[0017] The rock anchor hole drilling tool provided in this embodiment, by setting a guide shaft including a guide outer cylinder, a connecting inner cylinder, and a drive shaft, can measure and correct deviation in a timely manner during the drilling of the guide hole, ensuring that the inclination deviation of the rock anchor hole is no more than 0.5%, for example, no more than 20 cm inclination deviation when the hole depth is 40 m. Specifically, the drive shaft is located between the connecting inner cylinder and the drill bit and is used to transmit torque; the connecting inner cylinder is equipped with a first target, which can be used to monitor whether the drill tool has deviated and adjust the inclination of the drill tool during the correction process, so that the inclination of the drill tool can be quickly adjusted to the required range.

[0018] This rock-anchored borehole drill bit also features a double-walled drill pipe, which enhances rigidity and ensures smooth drilling. The inner drill pipe is hollow, allowing it to serve as an optical measurement channel, working in conjunction with the first target for deviation correction. The annulus between the inner and outer drill pipes acts as an annular fluid channel, allowing drilling mud to enter through this channel, reach the water cap, enter the drive shaft, pass through the drill bit's water inlet, and then carry rock cuttings back out through the annulus between the outer drill pipe and the formation, ensuring smooth drilling.

[0019] During the drilling of the pilot hole, both the first and second power components of this rock anchor hole drill are activated, and the inner and outer drill rods rotate simultaneously. When adjusting the trajectory, the first power component is deactivated and the second power component is activated, that is, the outer drill rod stops rotating while the inner drill rod continues to rotate, and the composite drilling is changed to pilot drilling for correction.

[0020] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope as a result.

[0021] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0022] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1This is a schematic diagram of the structure of a guide shaft provided in this embodiment;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure connecting the first and second targets inside the inner cylinder;

[0026] Figure 3 This is a schematic diagram of the structure of a first target provided in this embodiment;

[0027] Figure 4 This is a schematic diagram of a double-walled drill pipe provided in this embodiment;

[0028] Figure 5 for Figure 4 A schematic diagram of the structure of the second bearing.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Guide shaft; 11. Guide outer cylinder; 12. Connecting inner cylinder; 13. Drive shaft; 14. Universal joint; 15. First bearing; 16. Mounting cylinder; 17. First target; 18. Second target; 19. Prism; 110. Bend point; 111. Tooling; 2. Double-walled drill pipe; 21. Inner drill pipe; 22. Outer drill pipe; 221. Inlet; 23. Optical measurement channel; 24. Annular fluid channel; 25. Second bearing; 251. Steel ball. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0032] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or may be interposed with another element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or may be interposed with another element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Please see Figures 1 to 3 This application provides a guide shaft 1 for a rock anchor hole drill bit, comprising: a guide outer cylinder 11, a connecting inner cylinder 12, and a drive shaft 13.

[0035] The connecting inner cylinder 12 is completely located within the guide outer cylinder 11. The connecting inner cylinder 12 is used to transmit torque, and the guide outer cylinder 11 is used for guidance. The connecting inner cylinder 12 and the guide outer cylinder 11 are rotatably connected and concentrically arranged. Part of the drive shaft 13 is located inside the guide outer cylinder 11, and the rest of the drive shaft 13 is located outside the guide outer cylinder 11. The portion of the drive shaft 13 located inside the guide outer cylinder 11 is connected to the connecting inner cylinder 12, and the portion of the drive shaft 13 located outside the guide outer cylinder 11 is used to connect to the drill bit. The drive shaft 13 can continue to transmit the torque transmitted by the connecting inner cylinder 12 to the drill bit. A first target 17 is provided inside the connecting inner cylinder 12. The center of the first target 17 coincides with the center of the connecting inner cylinder 12. The first target 17 is used to monitor whether the drill bit has deviated and to adjust the inclination of the drill bit during the correction process, so that the inclination of the drill bit is quickly adjusted to the required range.

[0036] Specifically, the end of the guide outer cylinder 11 away from the drive shaft 13 is connected to a first power component, which drives the guide outer cylinder 11 to rotate and move forward, controlling the drilling direction. The end of the connecting inner cylinder 12 away from the drive shaft 13 is connected to a second power component, which rotates the drill bit and drills forward. The first and second power components can be provided by a drilling rig located on the ground.

[0037] The guide shaft 1 provided in this application has guiding, measuring and shock absorption functions. It is the first high-angle guide shaft 1 used in China. It can measure and correct deviation in a timely manner during the drilling of the guide hole, so that the inclination deviation of the rock anchor hole is no more than 0.5%. For example, when the hole depth is 40m, the inclination deviation is no more than 20cm.

[0038] like Figure 1As shown, the drive shaft 13 is connected to the connecting inner cylinder 12 via a universal joint 14, so that a bend 110 can be formed between the drive shaft 13 and the connecting inner cylinder 12, that is, there can be a certain angle between the drive shaft 13 and the connecting inner cylinder 12, for example, 1°, so that the drill bit connected to the drive shaft 13 not only rotates around the central axis of the drill bit body, but also has a certain oscillation, thereby achieving a better drilling effect.

[0039] like Figure 2 As shown, a mounting cylinder 16 is fixedly provided inside the inner connecting cylinder 12 near one end of the drive shaft 13, and the first target 17 is fixedly installed inside the mounting cylinder 16. Figure 3 As shown, the first target 17 is preferably configured as a lamp target, which has multiple asymmetrically arranged luminous LED beads. The lamp target is a self-luminous target with multiple luminous beads, and there is a farthest LED bead, which can be easily identified by taking a picture. The farthest LED bead is 2cm away from the center of the lamp target. The luminous image of the first target 17 is captured by a camera positioning device on the ground to determine the deviation of the drill bit.

[0040] In one embodiment, a second target 18 is further provided inside the connecting inner cylinder 12, the center of the second target 18 coinciding with the center of the connecting inner cylinder 12. The second target 18 is located on the side of the first target 17 away from the drive shaft 13, and the second target 18 can be used in conjunction with a total station to determine whether the drilled hole has deviated.

[0041] Specifically, the second target 18 is configured as a prism target, and a prism 19 is fixedly mounted on the side of the second target 18 away from the first target 17. The prism 19 is fixedly installed inside the mounting cylinder 16 by a tooling 111. To prevent the first target 17 and the camera positioning equipment from malfunctioning, after drilling a certain distance, the inclination of the drilled hole can be measured using the second target 18, the prism 19, and a total station to ensure that the inclination of the drilled hole meets the requirements. By using the first target 17 and the camera positioning equipment, the frequency of measurement and verification is increased, and the trajectory is re-measured using a total station and the second target 18, and deviations are frequently corrected to ensure that the drilling accuracy meets the design requirements.

[0042] like Figure 1 As shown, the guide outer cylinder 11 and the connecting inner cylinder 12 are rotatably connected by a first bearing 15. The first bearing 15 can be a TC string bearing. A straightening sleeve for straightening can be provided on the guide outer cylinder 11.

[0043] Based on the same concept, this invention also provides a rock anchor hole drill bit, as described in the following embodiments. Since the principle of this rock anchor hole drill bit in solving the problem and the technical effects it can achieve are similar to those of the guide shaft 1 described above, the implementation of this rock anchor hole drill bit can refer to the implementation of the guide shaft 1 described above, and the repeated parts will not be described again.

[0044] One embodiment of the present invention also provides a rock anchor hole drill bit, comprising: a guide shaft 1 as described in any of the above embodiments.

[0045] The rock anchor hole drilling tool provided in this embodiment also includes a drill bit, which is connected to the end of the drive shaft 13 of the guide shaft 1 away from the connecting inner cylinder 12. Addressing the challenges of difficult rock breaking and low efficiency caused by the high strength of slightly weathered andesite, the drill bit is made of high-quality diamond composite material, combined with a customized design to improve rock breaking efficiency and abrasion resistance. Specifically, a PDC (polycrystalline diamond composite) drill bit is preferred.

[0046] like Figure 4 As shown, the rock anchor hole drilling tool provided in this embodiment also includes a double-walled drill rod 2, which can enhance rigidity and ensure smooth drilling. The double-walled drill rod 2 is fixedly connected to the end of the guide shaft 1 away from the drill bit. The double-walled drill rod 2 includes an inner drill rod 21 and an outer drill rod 22 that are movably connected and concentrically arranged. The inner drill rod 21 is hollow, so that the interior of the inner drill rod 21 can serve as an optical measurement channel 23, a light channel for a camera positioning device, and work together with the first target 17 of the guide shaft 1 and the camera positioning device on the ground to achieve deviation correction. The annulus between the inner drill rod 21 and the outer drill rod 22 serves as an annulus fluid channel 24, allowing mud to enter from the annulus fluid channel 24, enter the drive shaft 13 at the water cap, pass through the drill bit water hole, and then carry rock cuttings back out from the annulus between the outer drill rod 22 and the formation, ensuring smooth drilling. The diameter of the drill bit is larger than the diameter of the outer drill rod 22, ensuring that the mud carrying rock cuttings can return from the annulus between the outer drill rod 22 and the formation.

[0047] The inner drill rod 21 and the connecting inner cylinder 12 are fixedly connected and concentrically arranged. The outer drill rod 22 and the guide outer cylinder 11 are fixedly connected and concentrically arranged. The end of the outer drill rod 22 away from the guide shaft 1 is used to connect to a first power component, which drives the outer drill rod 22 and the guide outer cylinder 11 to rotate and move forward, controlling the drilling direction. The end of the inner drill rod 21 away from the guide shaft 1 is used to connect to a second power component, which drives the inner drill rod 21, the connecting inner cylinder 12, and the transmission shaft 13 to rotate and move forward, thereby causing the drill bit to rotate and drill forward. The first and second power components can be provided by a drilling rig located on the ground.

[0048] The double-walled drill rod 2 is highly rigid and has high torque transmission efficiency. It is the first time in China that it has been used in conjunction with a camera positioning device. While transmitting power to the drill bit, it can provide a dry and centrally located optical measurement channel 23, enabling on-the-spot measurement during the drilling process.

[0049] During the drilling of the guide hole, both the first and second power components of the rock anchor hole drill are activated, and the inner drill rod 21 and the outer drill rod 22 rotate simultaneously. When adjusting the trajectory, the first power component is deactivated, and the second power component is activated. That is, the outer drill rod 22 stops rotating, while the inner drill rod 21 continues to rotate, switching from combined drilling to guided drilling for deviation correction. In other words, the rock anchor hole drill has both a drilling state and a deviation correction state. When the rock anchor hole drill is in the drilling state, both the first and second power components are activated, and the outer drill rod 22 and the inner drill rod 21 are driven to rotate. The outer drill rod 22 drives the guide outer cylinder 11 to rotate, and the inner drill rod 21 drives the connecting inner cylinder 12, the drive shaft 13, and the drill bit to rotate. When the rock anchor hole drill is in the deviation correction state, the first power component is deactivated, and the second power component is activated. The outer drill rod 22 stops rotating, while the inner drill rod 21 continues to rotate, driving the connecting inner cylinder 12, the drive shaft 13, and the drill bit to rotate for deviation correction.

[0050] In this embodiment, the outer drill rod 22 and the inner drill rod 21 are rotatably connected via a second bearing 25, so that the inner drill rod 21 is centered on the outer drill rod 22. Figure 5 As shown, the second bearing 25 includes a plurality of steel balls 251 arranged circumferentially. Figure 4 As shown, the outer drill rod 22 has two sealable inlets 221 in the axial direction for installing the second bearing 25. Multiple steel balls 251 enter between the outer drill rod 22 and the inner drill rod 21 through the inlets 221. After the steel balls 251 are installed, the inlets 221 are sealed.

[0051] Specifically, the rock anchor hole drilling tool includes multiple double-walled drill rods 2, with a centralizer positioned between adjacent double-walled drill rods 2. The diameter of the drill bit is larger than the diameter of the centralizer, ensuring that the drilling mud carrying rock cuttings can be returned through the annulus between the outer drill rod 22 and the formation.

[0052] In a specific application scenario, the extension of the double-walled drill pipe 2 is assisted by a crane. During drilling, drilling mud enters through the annular fluid channel 24 between the double-walled drill pipes 2 and returns with rock cuttings through the drill bit's water hole. During the pilot hole drilling process, surveyors monitor the drilling trajectory using a camera positioning device, and use the same device to observe the entire drilling process of the first target 17 placed at the center of the guide shaft 1. The measurement interval is 0.5m to 2m for the first 10m of drilling, 3m for 10m to 20m, and no more than 5m after 20m. Drilling is stopped before measurement, and the offset of the first target 17 is measured. If the deviation from the design trajectory exceeds 0.2%, it is adjusted promptly via the guide shaft 1. The three-dimensional drilling trajectory can be plotted and compared with the design trajectory. If a trajectory deviation occurs, it is corrected promptly via the guide shaft 1. During guide correction, the outer drill pipe 22 stops rotating and the tool face is determined; the inner drill pipe 21 continues to rotate. The inner and outer drill pipes 22 advance synchronously for correction. During the drilling process, the trajectory can be re-measured at any time using a gyro inclinometer.

[0053] In one embodiment, the drill bit diameter can be 241.3 mm. The diameter of the double-walled drill pipe 2 can be 168 mm. The diameter of the centralizer between the double-walled drill pipes 2 can be 238 mm.

[0054] It should be noted that in the description of this specification, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this specification, unless otherwise stated, "a plurality of" means two or more.

[0055] Any numerical values ​​cited herein include all values ​​ranging from a lower limit to an upper limit, increasing by one unit, with at least two units between any lower and any higher value. For example, if the quantity of a component or the value of a process variable (e.g., temperature, pressure, time, etc.) is described as being from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1, etc. These are merely examples intended for explicit expression, and it can be assumed that all possible combinations of values ​​listed between the minimum and maximum values ​​are explicitly described in this specification in a similar manner.

[0056] Unless otherwise stated, all ranges include the endpoints and all numbers between them. The terms "approximately" or "about" used with ranges apply to both endpoints of the range. Thus, "approximately 20 to 30" is intended to cover "approximately 20 to approximately 30," including at least the specified endpoints.

[0057] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional.

[0058] Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of "a" or "an" to describe an element, component, part, or step does not imply the exclusion of other elements, components, parts, or steps.

[0059] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A rock anchor hole drill bit, characterized in that, include: drill; A guide shaft connected to the drill bit includes an outer guide cylinder, a connecting inner cylinder, and a drive shaft. The connecting inner cylinder is completely located inside the outer guide cylinder, and the connecting inner cylinder and the outer guide cylinder are rotatably connected and concentrically arranged. Part of the drive shaft is located inside the outer guide cylinder, and the remaining drive shaft is located outside the outer guide cylinder. The portion of the drive shaft located inside the outer guide cylinder is connected to the connecting inner cylinder, and the portion of the drive shaft located outside the outer guide cylinder is connected to the drill bit. A first target is provided inside the connecting inner cylinder, and the center of the first target coincides with the center of the connecting inner cylinder. A double-walled drill rod is fixedly connected to the end of the guide shaft away from the drill bit. The double-walled drill rod includes an inner drill rod and an outer drill rod that are movably connected and concentrically arranged. The inner drill rod is hollow and serves as an optical measurement channel. The annular space between the inner and outer drill rods serves as an annular fluid channel. The inner drill rod and the connecting inner cylinder are fixedly connected and concentrically arranged. The outer drill rod and the guide outer cylinder are fixedly connected and concentrically arranged. The end of the outer drill rod away from the guide shaft is used to connect to a first power component, and the end of the inner drill rod away from the guide shaft is used to connect to a second power component. The diameter of the drill bit is larger than the diameter of the outer drill rod. A second target is provided inside the connecting inner cylinder, and the center of the second target coincides with the center of the connecting inner cylinder. The second target is located on the side of the first target away from the drive shaft. The second target is set as a prism target, and a prism is fixedly provided on the side of the second target away from the first target.

2. The rock anchor hole drill bit according to claim 1, characterized in that, The drive shaft is connected to the inner cylinder via a universal joint.

3. The rock anchor hole drill bit according to claim 1, characterized in that, An installation cylinder is fixedly provided at one end of the inner cylinder near the drive shaft, and the first target is fixedly installed inside the installation cylinder; the first target is set as a lamp target.

4. The rock anchor hole drill bit according to claim 1, characterized in that, The guide outer cylinder and the connecting inner cylinder are rotatably connected via a first bearing; the outer drill rod and the inner drill rod are rotatably connected via a second bearing.

5. The rock anchor hole drill bit according to claim 4, characterized in that, The second bearing includes a plurality of steel balls arranged circumferentially; the outer drill rod has two sealable inlets in the axial direction for mounting the second bearing.

6. The rock anchor hole drill bit according to claim 1, characterized in that, The rock anchor hole drilling tool includes multiple double-walled drill rods, with a centralizer provided between adjacent double-walled drill rods, and the diameter of the drill bit is larger than the diameter of the centralizer.

7. The rock anchor hole drill bit according to claim 1, characterized in that, The rock anchor hole drill has a drilling state and a correction state. When the rock anchor hole drill is in the drilling state, both the first power component and the second power component are activated, and the outer drill rod and the inner drill rod are driven to rotate respectively. When the rock anchor hole drill is in the correction state, the first power component is deactivated, the second power component is activated, the outer drill rod stops rotating, and the inner drill rod continues to rotate.

8. A guide shaft for a rock anchor hole drill bit, characterized in that, include: The system comprises a guide outer cylinder, a connecting inner cylinder, and a drive shaft. The connecting inner cylinder is entirely located within the guide outer cylinder, and the connecting inner cylinder and the guide outer cylinder are rotatably connected and concentrically arranged. Part of the drive shaft is located within the guide outer cylinder, while the remainder is located outside the guide outer cylinder. The portion of the drive shaft located within the guide outer cylinder is connected to the connecting inner cylinder, while the portion located outside the guide outer cylinder is used to connect to a drill bit. A first target is provided within the connecting inner cylinder, and the center of the first target coincides with the center of the connecting inner cylinder. One end of the guide outer cylinder away from the drive shaft is used to connect to a first power component, and the other end of the connecting inner cylinder away from the drive shaft is used to connect to a second power component. A second target is provided within the connecting inner cylinder, and the center of the second target coincides with the center of the connecting inner cylinder. The second target is located on the side of the first target away from the drive shaft. The second target is configured as a prism target, and a prism is fixedly mounted on the side of the second target away from the first target.

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