Guide shaft and rock anchor hole drilling tool thereof

Abstract

The invention discloses a guide shaft and a rock anchor hole drilling tool thereof. The rock anchor hole drilling tool comprises a drill bit, the guide shaft connected with the drill bit, and a double-wall drill rod fixedly connected with the end, away from the drill bit, of the guide shaft. 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 positioned in the guide outer cylinder; the part of the transmission shaft positioned in the guide outer cylinder is connected with the connecting inner cylinder; the part of the transmission shaft positioned 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; an annular space between the inner drill rod and the outer drill rod serves as an annular space fluid channel. The rock anchor hole drilling tool and the guide shaft thereof can measure and rectify deviation in time in the drilling process of the guide hole, so that the inclination deviation of the rock anchor hole is not greater than 0.5%.

Description

Technical Field

[0001] The present invention relates to the field of drilling technology, and in particular to a guide shaft and a rock anchor hole drilling tool thereof. Background Art

[0002] Anchor holes are holes drilled for laying anchor rods or cables when anchoring bridge rocks, dangerous rocks and building components. During the drilling process of anchor holes, due to the inclined construction angle and the harsh construction environment, the drilled anchor holes are often not accurate, especially the inclination deviation of the anchor holes cannot be controlled within a small range. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of this specification is to provide a guide shaft and a rock anchor hole drilling tool thereof, which can timely measure and correct the deviation during the drilling process 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-mentioned purpose, the embodiment of this specification provides a rock anchor hole drilling tool, including: drill; A guide shaft connected to the drill bit, the guide shaft comprising a guide outer cylinder, a connecting inner cylinder and a transmission shaft, the connecting inner cylinder is completely located in the guide outer cylinder, the connecting inner cylinder and the guide outer cylinder are rotatably connected and concentrically arranged; part of the transmission shaft is located in the guide outer cylinder, and the rest of the transmission shaft is located outside the guide outer cylinder; the part of the transmission shaft located in the guide outer cylinder is connected to the connecting inner cylinder, and the part of the transmission shaft located outside the guide outer cylinder is connected to 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; A double-wall drill rod fixedly connected to the end of the guide shaft away from the drill bit, the double-wall drill rod comprising an inner drill rod and an outer drill rod movably connected and concentrically arranged; the inner drill rod is hollow, and the interior of the inner drill rod serves as an optical measurement channel; the annulus between the inner drill rod and the outer drill rod serves as an annulus fluid channel; the inner drill rod is fixedly connected and concentrically arranged with the connecting inner cylinder; the outer drill rod is fixedly connected and concentrically arranged with the guide outer cylinder; the end of the outer drill rod away from the guide shaft is used for connecting to a first power member, and the end of the inner drill rod away from the guide shaft is used for connecting to a second power member; the diameter of the drill bit is larger than the diameter of the outer drill rod.

[0005] As a preferred implementation, the transmission shaft is connected to the connecting inner cylinder via a universal shaft.

[0006] As a preferred embodiment, a mounting tube is fixedly provided in one end of the connecting inner tube close to the transmission shaft, and the first target is fixedly installed in the mounting tube; the first target is set as a lamp target.

[0007] As a preferred implementation, a second target is provided in 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 a side of the first target away from the transmission shaft.

[0008] As a preferred implementation, the second target is configured as a prism target, and a prism is fixedly provided on a side of the second target away from the first target.

[0009] As a preferred implementation manner, the guide outer cylinder is rotatably connected to the connecting inner cylinder via a first bearing; and the outer drill rod is rotatably connected to the inner drill rod via a second bearing.

[0010] As a preferred embodiment, the second bearing comprises a plurality of steel balls arranged along the circumferential direction; the outer drill rod is provided with two sealable inlets in the axial direction for installing the second bearing.

[0011] As a preferred embodiment, the rock anchor hole drilling tool comprises a plurality of the double-wall drill rods, a stabilizer is provided between adjacent double-wall drill rods, and the diameter of the drill bit is larger than the diameter of the stabilizer.

[0012] As a preferred embodiment, the rock anchor hole drill tool has a drilling state and a correction state. When the rock anchor hole drill tool is in the drilling state, the first power member and the second power member are both turned on, and the outer drill rod and the inner drill rod are driven to rotate respectively; when the rock anchor hole drill tool is in the correction state, the first power member is turned off, the second power member is turned on, the outer drill rod stops rotating, and the inner drill rod continues to rotate.

[0013] An embodiment of the present specification provides a guide shaft of a rock anchor hole drilling tool, comprising: a guide outer cylinder, a connecting inner cylinder and a transmission shaft, wherein 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 transmission shaft is located inside the guide outer cylinder, and the rest of the transmission shaft is located outside the guide outer cylinder; the part of the transmission shaft located inside the guide outer cylinder is connected to the connecting inner cylinder, and the part of the transmission shaft located outside the guide outer cylinder is used to be connected 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 transmission shaft is used to connect to a first power member, and the end of the connecting inner cylinder away from the transmission shaft is used to connect to a second power member. Beneficial Effects

[0014] The rock anchor hole drilling tool provided in this embodiment can timely measure and correct the deviation during the drilling of the guide hole by setting a guide shaft including a guide outer cylinder, a connecting inner cylinder and a transmission shaft, so that the inclination deviation of the rock anchor hole is not greater than 0.5%. For example, when the hole depth is 40m, the inclination deviation is not greater than 20cm. Specifically, the transmission shaft is located between the connecting inner cylinder and the drill bit, and is used to transmit torque; a first target is provided in the connecting inner cylinder, which can be used to monitor whether the drilling tool is offset and cooperate to adjust the inclination of the drilling tool during the correction process, so that the inclination of the drilling tool is quickly adjusted to the required range.

[0015] The rock anchor hole drilling tool is also equipped with a double-wall drill rod, which can enhance rigidity and ensure smooth drilling. The inner drill rod is hollow, so that the inner drill rod can be used as an optical measurement channel, and cooperate with the first target to achieve deviation correction. The annulus between the inner drill rod and the outer drill rod serves as an annulus fluid channel, allowing mud to enter from the annulus fluid channel, enter the inside of the transmission shaft at the water cap, pass through the drill bit water hole, and then carry rock cuttings out of the annulus between the outer drill rod and the formation, ensuring smooth drilling.

[0016] During the drilling process of the guide hole of the rock anchor hole drilling tool, the first power member and the second power member are both turned on, and the inner drill rod and the outer drill rod rotate simultaneously; when adjusting the trajectory, the first power member is turned off and the second power member is turned on, that is, the outer drill rod stops rotating and the inner drill rod continues to rotate, and the composite drilling is changed to the guide drilling for correction.

[0017] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0018] Features described and / or illustrated with respect to 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.

[0019] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of 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 paying any creative labor.

[0021] Figure 1A schematic diagram of the structure of a guide shaft provided in this embodiment; Figure 2 for Figure 1 A schematic diagram of the structure connecting the first target and the second target in the inner cylinder; Figure 3 A schematic diagram of the structure of a first target provided in this embodiment; Figure 4 This is a schematic diagram of the structure of a double-wall drill pipe provided in this embodiment; Figure 5 for Figure 4 Schematic diagram of the structure of the second bearing.

[0022] Description of reference numerals: 1. Guide shaft; 11. Guide outer cylinder; 12. Connecting inner cylinder; 13. Transmission shaft; 14. Universal joint; 15. First bearing; 16. Mounting cylinder; 17. First target; 18. Second target; 19. Prism; 110. Bending point; 111. Tooling; 2. Double-wall 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 DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] See also Figures 1 to 3 The embodiment of the present application provides a guide shaft 1 of a rock anchor hole drilling tool, comprising: a guide outer cylinder 11 , a connecting inner cylinder 12 and a transmission shaft 13 .

[0027] The connecting inner cylinder 12 is completely located in the guiding outer cylinder 11. The connecting inner cylinder 12 is used to transmit torque, and the guiding outer cylinder 11 is used for guiding. The connecting inner cylinder 12 and the guiding outer cylinder 11 are connected in rotation and are concentrically arranged. Part of the transmission shaft 13 is located in the guiding outer cylinder 11, and the rest of the transmission shaft 13 is located outside the guiding outer cylinder 11. The part of the transmission shaft 13 located in the guiding outer cylinder 11 is connected to the connecting inner cylinder 12, and the part of the transmission shaft 13 located outside the guiding outer cylinder 11 is used to connect with the drill bit. The transmission 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 in the connecting inner cylinder 12, and 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 drilling tool is offset and cooperate to adjust the inclination of the drilling tool during the deviation correction process, so that the inclination of the drilling tool is quickly adjusted to the required range.

[0028] Specifically, the end of the guide outer cylinder 11 away from the transmission shaft 13 is used to connect to a first power member, and the first power member is used to drive the guide outer cylinder 11 to rotate and move forward to control the drilling direction. The end of the connecting inner cylinder 12 away from the transmission shaft 13 is used to connect to a second power member, and the second power member is used to rotate the drill bit and drill forward. The first power member and the second power member can be provided by a drilling rig located on the ground.

[0029] The guide shaft 1 provided in the embodiment of the present application has guiding, measuring and shock absorbing functions. It is the first high-inclination guide shaft 1 used in China. It can timely measure and correct the deviation during the drilling process 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.

[0030] like Figure 1 As shown, the transmission shaft 13 is connected to the connecting inner cylinder 12 via a universal shaft 14, so that a bending point 110 can be formed between the transmission shaft 13 and the connecting inner cylinder 12, that is, there can be a certain angle between the transmission shaft 13 and the connecting inner cylinder 12, such as 1°, so that the drill bit connected to the transmission shaft 13 not only rotates around the central axis of the drill bit body, but also has a certain swing, thereby achieving a better drilling effect.

[0031] like Figure 2 As shown, a mounting tube 16 is fixedly disposed at one end of the connecting inner tube 12 close to the transmission shaft 13, and the first target 17 is fixedly mounted in the mounting tube 16. Figure 3As shown, the first target 17 is preferably set as a lamp target, on which a plurality of asymmetrically arranged luminous LED lamp beads are arranged. The lamp target is a self-luminous target, and is provided with a plurality of luminous lamp beads, and there is a farthest point LED lamp bead, which can be easily photographed and identified. The farthest point LED lamp bead is 2 cm away from the center of the lamp target. A camera positioning device is used on the ground to capture the luminous image of the first target 17, so as to determine the deviation of the drill bit.

[0032] In one embodiment, a second target 18 is further provided in the connecting inner cylinder 12, and the center of the second target 18 coincides 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 transmission shaft 13, and the second target 18 can cooperate with a total station to determine whether the drilled hole is offset.

[0033] Specifically, the second target 18 is set as a prism target, and a prism 19 is fixedly provided on the side of the second target 18 away from the first target 17. The prism 19 is fixedly installed in the installation tube 16 through the tooling 111. In order to avoid the failure of the first target 17 and the camera positioning device, after drilling a certain distance, the inclination of the drilled hole can be measured by the second target 18, the prism 19 and the total station to ensure that the inclination of the drilled hole meets the requirements. By adopting the first target 17 and the camera positioning device, the frequency of measurement review is increased, and the total station and the second target 18 are used to re-measure the trajectory, and the deviation is corrected frequently to ensure that the drilling accuracy meets the design requirements.

[0034] like Figure 1 As shown, the guide outer cylinder 11 is rotatably connected to the connecting inner cylinder 12 via a first bearing 15. The first bearing 15 may be a TC series bearing. A straightening sleeve for straightening may be provided on the guide outer cylinder 11.

[0035] Based on the same concept, the present invention also provides a rock anchor hole drilling tool in the embodiment, as described in the following embodiment. Since the principle of solving the problem and the technical effect that can be achieved by the rock anchor hole drilling tool are similar to those of the above-mentioned guide shaft 1, the implementation of the rock anchor hole drilling tool can refer to the implementation of the above-mentioned guide shaft 1, and the repeated parts will not be repeated.

[0036] An embodiment of the present invention further provides a rock anchor hole drilling tool, comprising: a guide shaft 1 as described in any one of the above embodiments.

[0037] The rock anchor hole drilling tool provided in this embodiment also includes a drill bit, which is connected to the end of the transmission shaft 13 of the guide shaft 1 away from the inner cylinder 12. In view of the difficulty of rock breaking and low efficiency caused by the high strength of slightly weathered dacite, the material of the drill bit adopts high-quality diamond composite sheet, combined with personalized design, to improve the rock breaking efficiency and anti-abrasion ability. That is, the drill bit is preferably a PDC (polycrystalline diamond composite sheet) drill bit.

[0038] like Figure 4 As shown, the rock anchor hole drilling tool provided in this embodiment also includes a double-wall drill rod 2, which can enhance rigidity and ensure smooth drilling. The double-wall drill rod 2 is fixedly connected to the end of the guide shaft 1 away from the drill bit. The double-wall 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 inner drill rod 21 can be used as an optical measurement channel 23, as a light channel for a camera positioning device, and cooperates 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 is used as an annulus fluid channel 24, so that mud enters from the annulus fluid channel 24, enters the inside of the transmission shaft 13 at the water cap, passes through the drill bit water hole, and then carries rock cuttings out of 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 mud carrying rock cuttings can be returned from the annulus between the outer drill rod 22 and the formation.

[0039] The inner drill rod 21 and the connecting inner cylinder 12 are fixedly connected and concentrically arranged. The outer drill rod 22 and the guiding outer cylinder 11 are fixedly connected and concentrically arranged. The end of the outer drill rod 22 away from the guiding shaft 1 is used to connect to a first power member, and the first power member is used to drive the outer drill rod 22 and the guiding outer cylinder 11 to rotate and move forward to control the drilling direction. The end of the inner drill rod 21 away from the guiding shaft 1 is used to connect to a second power member, and the second power member is used to drive the inner drill rod 21, the connecting inner cylinder 12 and the transmission shaft 13 to rotate and move forward, so that the drill bit rotates and drills forward. The first power member and the second power member can be provided by a drilling rig located on the ground.

[0040] The double-wall drill pipe 2 has strong rigidity and high torque transmission efficiency. It is used in conjunction with a camera positioning device for the first time in China. While transmitting power to the drill bit, it can provide a dry, centered optical measurement channel 23 to achieve measurement while drilling during the drilling process.

[0041] During the drilling process of the guide hole of the rock anchor hole drilling tool, the first power member and the second power member are both turned on, and the inner drill rod 21 and the outer drill rod 22 rotate simultaneously; when adjusting the trajectory, the first power member is turned off and the second power member is turned on, that is, the outer drill rod 22 stops rotating, and the inner drill rod 21 continues to rotate, and the composite drilling is changed to the guide drilling for deviation correction. That is, the rock anchor hole drilling tool has a drilling state and a deviation correction state. When the rock anchor hole drilling tool is in the drilling state, the first power member and the second power member are both turned on, the outer drill rod 22 and the inner drill rod 21 are driven to rotate respectively, 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 transmission shaft 13 and the drill bit to rotate. When the rock anchor hole drilling tool is in the deviation correction state, the first power member is turned off and the second power member is turned on, the outer drill rod 22 stops rotating, and the inner drill rod 21 continues to rotate, driving the connecting inner cylinder 12, the transmission shaft 13 and the drill bit to rotate and correct the deviation.

[0042] In this embodiment, the outer drill rod 22 is rotatably connected to the inner drill rod 21 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 along the circumferential direction. Figure 4 As shown, the outer drill rod 22 is provided with two sealable inlets 221 in the axial direction for installing the second bearing 25. A plurality of steel balls 251 enter between the outer drill rod 22 and the inner drill rod 21 from the inlets 221. After the steel balls 251 are installed, the inlets 221 are sealed.

[0043] Specifically, the rock anchor hole drilling tool comprises a plurality of double-walled drill rods 2, and a centralizer is provided between adjacent double-walled drill rods 2. The diameter of the drill bit is larger than the diameter of the centralizer, ensuring that the mud carrying the rock cuttings can be returned from the annulus between the outer drill rod 22 and the formation.

[0044] In a specific application scenario, the extension of the double-wall drill pipe 2 is assisted by a crane. During drilling, mud enters from the annular fluid channel 24 between the double-wall drill pipes 2 and returns from the drill bit water hole carrying rock cuttings. During the drilling of the guide hole, the surveyor monitors the drilling trajectory through the camera positioning device, and uses the camera positioning device to observe the entire drilling process of the first target 17 placed in the center of the guide shaft 1. The measurement interval is 0.5m to 2m before drilling 10m, the measurement interval is 3m from 10m to 20m, and the measurement interval after 20m does not exceed 5m. Stop drilling before measurement, measure the offset of the first target 17, and if the deviation from the designed trajectory exceeds 0.2%, adjust it in time through the guide shaft 1. The three-dimensional drilling trajectory can be drawn for comparison with the designed trajectory. If there is a trajectory deviation, the guide shaft 1 is used to correct the deviation in time. During the 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 move forward synchronously for correction. During the drilling process, the gyro inclinometer can be used to remeasure the trajectory at any time.

[0045] In one embodiment, the diameter of the drill bit may be 241.3 mm, the diameter of the double-wall drill pipe 2 may be 168 mm, and the diameter of the centralizer between the double-wall drill pipes 2 may be 238 mm.

[0046] It should be noted that, in the description of this specification, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this specification, unless otherwise specified, the meaning of "plurality" is two or more.

[0047] Any numerical value cited herein includes all values ​​of lower and upper values ​​that increase by one unit from the lower limit to the upper limit, and there is at least a two-unit interval between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is set forth to be from 1 to 90, preferably from 20 to 80, and 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 the specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of numerical values ​​listed between the lowest value and the highest value are clearly set forth in the specification in a similar manner.

[0048] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0049] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0050] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0051] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including disclosures of 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 to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A rock anchor hole drilling tool, characterized in that: include: drill; A guide shaft connected to the drill bit, the guide shaft comprising a guide outer cylinder, a connecting inner cylinder and a transmission shaft, the connecting inner cylinder is completely located in the guide outer cylinder, the connecting inner cylinder and the guide outer cylinder are rotatably connected and concentrically arranged; part of the transmission shaft is located in the guide outer cylinder, and the rest of the transmission shaft is located outside the guide outer cylinder; the part of the transmission shaft located in the guide outer cylinder is connected to the connecting inner cylinder, and the part of the transmission shaft located outside the guide outer cylinder is connected to 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; A double-wall drill rod fixedly connected to the end of the guide shaft away from the drill bit, the double-wall drill rod comprising an inner drill rod and an outer drill rod movably connected and concentrically arranged; the inner drill rod is hollow, and the interior of the inner drill rod serves as an optical measurement channel; the annulus between the inner drill rod and the outer drill rod serves as an annulus fluid channel; the inner drill rod is fixedly connected and concentrically arranged with the connecting inner cylinder; the outer drill rod is fixedly connected and concentrically arranged with the guide outer cylinder; the end of the outer drill rod away from the guide shaft is used for connecting to a first power member, and the end of the inner drill rod away from the guide shaft is used for connecting to a second power member; the diameter of the drill bit is larger than the diameter of the outer drill rod.

2. The rock anchor hole drilling tool according to claim 1, characterized in that: The transmission shaft is connected to the connecting inner cylinder via a universal shaft.

3. The rock anchor hole drilling tool according to claim 1, characterized in that: A mounting tube is fixedly provided at one end of the connecting inner tube close to the transmission shaft, and the first target is fixedly installed in the mounting tube; the first target is set as a lamp target.

4. The rock anchor hole drilling tool according to claim 3, characterized in that: A second target is arranged in 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 a side of the first target away from the transmission shaft.

5. The rock anchor hole drilling tool according to claim 4, characterized in that: The second target is configured as a prism target, and a prism is fixedly provided on a side of the second target away from the first target.

6. The rock anchor hole drilling tool according to claim 1, characterized in that: The guide outer cylinder is rotatably connected to the connecting inner cylinder via a first bearing; the outer drill rod is rotatably connected to the inner drill rod via a second bearing.

7. The rock anchor hole drilling tool according to claim 6, characterized in that: The second bearing comprises a plurality of steel balls arranged in a circumferential direction; the outer drill rod is provided with two sealable inlets in the axial direction for installing the second bearing.

8. The rock anchor hole drilling tool according to claim 1, characterized in that: The rock anchor hole drilling tool comprises a plurality of the double-wall drill rods, a centralizer is provided between adjacent double-wall drill rods, and the diameter of the drill bit is greater than the diameter of the centralizer.

9. The rock anchor hole drilling tool according to claim 1, characterized in that: The rock anchor hole drilling tool has a drilling state and a correction state. When the rock anchor hole drilling tool is in the drilling state, the first power member and the second power member are both turned on, and the outer drill rod and the inner drill rod are driven to rotate respectively; when the rock anchor hole drilling tool is in the correction state, the first power member is turned off, the second power member is turned on, the outer drill rod stops rotating, and the inner drill rod continues to rotate.

10. A guide shaft for a rock anchor hole drilling tool, characterized in that: include: A guide outer cylinder, a connecting inner cylinder and a transmission shaft, wherein the connecting inner cylinder is completely located inside the guide outer cylinder, the connecting inner cylinder and the guide outer cylinder are rotatably connected and concentrically arranged; part of the transmission shaft is located inside the guide outer cylinder, and the rest of the transmission shaft is located outside the guide outer cylinder; the part of the transmission shaft located inside the guide outer cylinder is connected to the connecting inner cylinder, and the part of the transmission shaft located outside the guide outer cylinder is used to be connected 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 transmission shaft is used to connect to a first power member, and the end of the connecting inner cylinder away from the transmission shaft is used to connect to a second power member.

Images