Hole-drilling method, post-construction anchor construction method and hole-drilling tool

Abstract

To provide a hole-drilling method that is less noisy and can drill holes with less variation in diameter, a post-construction anchor construction method and a hole-drilling tool.SOLUTION: A hole-drilling method is a method for drilling a hole 101 with a first diameter dimension φ1 in a to-be-drilled object 100, and includes a hole-drilling step S3 in which a grinding drill bit 21 that has a grinding blade 24 with a second diameter dimension φ2 smaller than the first diameter dimension φ1 is rotated to form the hole 101 in the to-be-drilled object 100 and a diameter enlarging step S5 in which a cutting drill bit 31 that has a cutting blade 34 with a first diameter dimension φ1 is rotated to cut the inner peripheral surface of the hole 101 and expand the diameter.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a drilling method, a method for installing a post-installed anchor, and a drilling tool. [Background technology]

[0002] Conventionally, a method for drilling holes in a wall such as concrete using a drilling tool having a cutting blade containing cemented carbide has been known. For example, Patent Document 1 discloses a drill bit that can be used for drilling holes involving impact cutting. The drill bit has a cutting blade tip made of cemented carbide fixed thereto, and can drill holes of a fixed diameter with high precision. Therefore, drill holes drilled in concrete, stone, etc. can be used for planting anchor bolts, etc., without affecting the pull-out strength of the anchor bolts after planting. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-225026 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, drilling using the drill bit in Patent Document 1 involves impact cutting, which has the problem of generating loud noises, including impact sounds, during operation. This makes it difficult to use the drill bit in environments where quietness is required, such as renovation work on an operating hospital. [Means for solving the problem]

[0005] In order to solve the above problems, a drilling method according to one embodiment of the present invention is a method for drilling a hole of a first diameter dimension in a drilling object, comprising: a drilling step of rotating a grinding drill bit having a grinding blade with a second diameter dimension smaller than the first diameter dimension to form a hole in the drilling object; and an expanding step of rotating a cutting drill bit having a cutting blade with the first diameter dimension to cut an inner surface of the hole and expand the hole.

[0006] With this configuration, holes can be drilled with low noise and small variation in diameter. Effect of the Invention

[0007] The present invention has the advantage that holes can be drilled with low noise and small variation in diameter. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing an example of the overall configuration of a drilling system according to an embodiment; [Diagram 2] FIG. 2 is a diagram showing an example of the configuration of a drilling tool of the drilling system of FIG. 1, showing a state in which a grinding drill bit is attached to a shared shaft. [Diagram 3] FIG. 2 is a diagram showing an example of the configuration of a grinding drill bit of a drilling tool of the drilling system of FIG. 1, as viewed from the tip side. [Figure 4] FIG. 2 is a diagram showing an example of the configuration of a drilling tool of the drilling system of FIG. 1, showing a state in which a cutting drill bit is attached to a common shaft. [Diagram 5] FIG. 2 is a diagram showing an example of the configuration of a cutting drill bit of a drilling tool of the drilling system of FIG. 1, as viewed from the tip side. [Figure 6] 1 is a flowchart showing an example of a drilling operation method and a post-installed anchor installation method using the drilling system according to an embodiment. [Figure 7] 1 is a diagram showing an example of a drilling step in a drilling operation method and a post-installed anchor installation method using a drilling system according to an embodiment. FIG. [Figure 8]1A to 1C are diagrams showing an example of an expanding step in a drilling operation method and a post-installed anchor installation method using a drilling system according to an embodiment. [Figure 9] FIG. 13 is a diagram showing an example of an anchor installation step in a post-installed anchor installation method using the drilling system according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described with reference to the drawings. Note that the present invention is not limited to the following embodiments. In the following, the same or corresponding elements are denoted by the same reference numerals throughout the drawings, and duplicated descriptions thereof will be omitted.

[0010] 1 is a schematic diagram showing an example of the overall configuration of a drilling system 1 according to an embodiment. In this embodiment, the drilling system 1 is a drilling system that forms a hole 101 of a predetermined depth in a drilling target 100 with a drilling tool 20 attached to a drill driving device 3. This hole 101 is a hole for inserting and fixing a post-installed anchor 110 (see FIG. 9 ). The drilling target 100 is, for example, concrete, stone, or tile.

[0011] The drilling system 1 comprises a drill driving device 3, a drilling tool 20, a shielding portion 50, a liquid supply passage 60, and a liquid recovery passage 70.

[0012] The drill driving device 3 is, for example, an electric drill driver, and includes a driving device body 4 including a motor, an operation unit 5 where an operator operates the driving device body 4, and a gripping mechanism 6 that grips the base end of the drilling tool 20 and rotates about a rotation axis R by the driving force of the driving device body 4. The gripping mechanism 6 is, for example, a well-known drill chuck that is formed in a cylindrical shape and grips the drilling tool 20 fitted inside.

[0013] FIG. 2 is a diagram showing a configuration example of the drilling tool 20 excluding the liquid supply mechanism 10, and is a diagram showing a state in which the grinding drill bit 21 is attached to the shared shaft 41. FIG. 2 is shown in a half cross-sectional view. FIG. 3 is a diagram showing a configuration example of the grinding drill bit 21, and is a diagram showing the grinding drill bit 21 from the tip side. FIG. 4 is a diagram showing a configuration example of the drilling tool 20 excluding the liquid supply mechanism 10, and is a diagram showing a state in which the cutting drill bit 31 is attached to the shared shaft 41. FIG. 4 is shown in a partially cutaway view. FIG. 5 is a diagram showing a configuration example of the cutting drill bit 31, and is a diagram showing the cutting drill bit 31 from the tip side.

[0014] The drilling tool 20 is a tool for grinding and cutting a drilling target 100. As shown in Fig. 1, the drilling tool 20 includes a liquid supply mechanism 10, a grinding drill bit 21, a cutting drill bit 31, a shared shaft 41, and the liquid supply mechanism 10.

[0015] As shown in FIG. 1, the liquid supply mechanism 10 is a mechanism for supplying water L to the grinding drill bit 21 of the drilling tool 20. The liquid supply mechanism 10 supplies water L to the grinding drill bit 21 of the drilling tool 20, thereby reducing friction between the grinding drill bit 21 and the drilling target 100 during the grinding operation and further suppressing heat generation. This allows the grinding drill bit 21 to have a long life. The liquid supply mechanism 10 includes a base end portion 13 including a shank portion 15 and a tip portion 12 including a gripping mechanism 14. The shank portion 15 is gripped by a gripping mechanism 6 of the drill driving device 3. The gripping mechanism 14 is formed in a cylindrical shape and grips a shank portion 45 of a common shaft 41 fitted inside. In addition, a pipe forming a liquid supply flow path 60 is connected to the liquid supply mechanism 10, and water L is supplied thereto. The water L supplied to the liquid supply mechanism 10 flows through a flow path inside the liquid supply mechanism 10 and flows out of the gripping mechanism 14.

[0016] The common shaft 41 is a cylindrical body extending on the rotation axis R in an assembled state, and is a hollow rotation shaft that connects the drill driving device 3 to the grinding drill bit 21 and the cutting drill bit 31 that abut against the drilling target 100. The common shaft 41 includes a base end 43 including a shank portion 45, a tip end 42 including a mounting portion 44, and a through hole 46 extending on the rotation axis R. The shank portion 45 is held by the gripping mechanism 14 of the liquid supply mechanism 10. In this way, the common shaft 41 is attached to the drill driving device 3. The connection portion between the shank portion 45 and the gripping mechanism 14 has a watertight structure. Then, the water L flowing out from the gripping mechanism 14 flows into the through hole 46 and flows from the base end 43 of the common shaft 41 to the tip end 42 through the through hole 46. The mounting portion 44 is a portion to which the mounting portion 25 of the grinding drill bit 21 or the mounting portion 35 of the cutting drill bit 31 is selectively attached. In the present embodiment, a female thread is formed in the mounting portion 44. Therefore, when the gripping mechanism 6 rotates about the rotation axis R, the shank portion 15 of the liquid supply mechanism 10, the gripping mechanism 14, the shared shaft 41, and the grinding drill bit 21 or the cutting drill bit 31 attached to the shared shaft 41 rotate about the rotation axis R.

[0017] The grinding drill bit 21 is a cylindrical body having a substantially short cylindrical shape extending on the rotation axis R in an assembled state. The grinding drill bit 21 is a cutting tool that cuts the drilling target 100 with a grindstone to drill a hole. The grinding drill bit 21 includes a base end 23 including an attachment portion 25, a tip portion 22 including one or more grinding blades 24, and a through hole 26 extending on the rotation axis R and penetrating the grinding drill bit 21. The attachment portion 25 is a cylindrical body, and is formed with a male thread that meshes with the female thread of the attachment portion 44 of the common shaft 41. The one or more grinding blades 24 are attached to the front surface of the attachment portion 25 so that the trajectory when rotated around the rotation axis R forms a ring, and the diameter dimension of the trajectory forms a second diameter dimension φ2. The second diameter dimension φ2 forms the cutting edge diameter of the grinding drill bit 21. Each grinding blade 24 is fixed to the mounting portion 25 by brazing or welding. In this embodiment, four grinding blades 24 are provided and arranged side by side at intervals in the circumferential direction centered on the rotation axis R. However, this is not limited to this. For example, the grinding blade 24 may be a C-shaped columnar body when viewed from the tip side. The grinding blade 24 includes a metal bond diamond grindstone in which diamond abrasive grains, which are a grinding material, are bonded with a metal bond, which is a bonding material. In addition, the water L that passes through the through hole 46 of the common shaft 41 passes through the through hole 26 of the grinding drill bit 21 and is discharged from the tip of the grinding drill bit 21.

[0018] The cutting drill bit 31 is a columnar body having a substantially short cylindrical shape extending on the rotation axis R in an assembled state. The cutting drill bit 31 is a cutting tool that cuts off the drilling target 100 with a blade to drill a hole. The cutting drill bit 31 includes a base end portion 33 including an attachment portion 35 and a tip portion 32 including a cutting blade 34. The attachment portion 35 is a columnar body, and is formed with a male thread that meshes with the female thread of the attachment portion 44 of the common shaft 41. The cutting blade 34 is attached to the tip portion of the attachment portion 35 so that the diameter dimension of the trajectory when rotated around the rotation axis R forms a first diameter dimension φ1. The first diameter dimension φ1 forms the cutting edge diameter of the cutting drill bit 31. The cutting drill bit 31 is, for example, a plate-shaped block body including a cemented carbide alloy, has a width of the first diameter dimension φ1, and the tip side portion is formed into a pointed shape. The side ends of the cutting blade 34 protrude radially from the mounting portion 35, and the tip of the cutting blade 34 protrudes in the tip direction from the mounting portion 35. This prevents the mounting portion 35 from coming into contact with the object 100 to be drilled and becoming worn.

[0019] In this way, by the engagement of the male thread and the female thread, the grinding drill bit 21 or the cutting drill bit 31 can be selectively attached to the common shaft 41. This allows the grinding drill bit 21 and the cutting drill bit 31 to be quickly replaced with each other.

[0020] The shielding part 50 is a cover that covers the hole 101 of the drilling target 100, and is formed in a sideways bowl shape with a large opening at the front. By facing this front surface to the drilling target 100, it is possible to cover the hole 101 during drilling work and suppress the scattering of dust. In addition, an insertion hole 51 is formed on the back surface of the shielding part 50, through which a common shaft 41 to which a grinding drill bit 21 or a cutting drill bit 31 is attached is inserted. Furthermore, a pipe forming a liquid recovery flow path 70 is connected to the lower part of the shielding part 50, and the liquid recovery flow path 70 is connected to the internal space of the shielding part 50. As a result, the suspension S in which the dust that has drilled the hole 101 is mixed with the water L is recovered through the liquid recovery flow path 70.

[0021] (An example of drilling work) Fig. 6 is a flow chart showing an example of a drilling method and a post-installed anchor installation method using the drilling system 1. Fig. 7 is a diagram showing an example of a drilling step, Fig. 8 is a diagram showing an example of a diameter expanding step, and Fig. 9 is a diagram showing an example of an anchor setting step.

[0022] 6 to 9, a drilling method for drilling a hole 101 having a first diameter dimension φ1 in a drilling target 100 using the drilling system 1 and a post-installed anchor installation method will be described.

[0023] First, an operator prepares the grinding drill bit 21, the cutting drill bit 31, and the common shaft 41 (preparation step S1). The cutting edge diameter of the grinding blade 24 of the grinding drill bit 21 is set to a second diameter dimension φ2 smaller than the first diameter dimension φ1. The cutting edge diameter of the cutting blade 34 of the cutting drill bit 31 is set to the first diameter dimension φ1. Specifically, for example, when the first diameter dimension φ1 is 18 mm, the second diameter dimension φ2 may be 17 mm.

[0024] Next, the worker attaches the male thread of the attachment portion 25 of the grinding drill bit 21 to the female thread of the attachment portion 44 of the common shaft 41 (attaching step S2).

[0025] Next, as shown in FIG. 7, the operator rotates the grinding drill bit 21 by driving the shared shaft 41 with the drill driving device 3, and urges it toward the drilling target 100, pressing the tip surface of the grinding drill bit 21 against the drilling target 100. This causes the metal bond diamond grindstone of the grinding drill bit 21 to grind the drilling target 100. This allows a hole 101 having a second diameter dimension φ2 to be formed in the drilling target 100 (drilling step S3). This drilling operation using the grinding drill bit 21 is performed while supplying water L from the liquid supply flow path 60 to the liquid supply mechanism 10. The water L supplied to the liquid supply mechanism 10 passes through the internal space of the liquid supply mechanism 10, the through hole 46 of the shared shaft 41, and the through hole 26 of the grinding drill bit 21 in this order, and is discharged from the tip of the drilling tool 20. The discharged water L reduces friction between the grinding drill bit 21 and the drilling target 100, and also suppresses heat generation. At this time, the dust that has drilled the hole 101 mixes with the water L, forming a suspension liquid S. The suspension liquid S is discharged from the shielding part 50 into the liquid recovery passage 70 and is recovered.

[0026] The drilling operation using this grinding drill bit 21 does not produce impact noise compared to drilling operations involving impact using a vibration drill driver or a hammer drill driver, so drilling operations with excellent quietness can be performed. Therefore, it can be suitable for use in environments where quietness is required, such as renovation work of an operating hospital. In addition, due to the characteristics of the grinding blade 24 in which diamond abrasive grains as an abrasive material are scattered in the metal bond as a bonding material, the hole 101 formed by the grinding blade 24 has a slightly larger variation in diameter dimension than the hole 101 formed by the cutting blade 34.

[0027] Then, when the hole 101 of the desired depth is formed, the worker ends the drilling step S3 and temporarily pulls out the shared shaft 41 from the drilling target 100. Then, the worker removes the grinding drill bit 21 from the shared shaft 41, and attaches the mounting portion 35 of the cutting drill bit 31 to the mounting portion 44 of the shared shaft 41, thereby attaching the cutting drill bit 31 to the shared shaft 41 (attachment step S4). In this way, the grinding blade 24 can be replaced with the cutting blade 34, and the diameter expansion step can be performed quickly, thereby shortening the operation time. In addition, the equipment for rotating the grinding blade 24 and the equipment for rotating the cutting blade 34 can be shared, and the equipment required for the drilling operation can be reduced.

[0028] Next, as shown in Fig. 8, the worker rotates the common shaft 41 with the drill driving device 3 while the mounting portion 35 of the cutting drill bit 31 is attached to the mounted portion 44 of the common shaft 41, thereby rotating the cutting drill bit 31 and urging it toward the drilling target 100, thereby inserting the cutting drill bit 31 into the hole 101. As a result, the side end of the cutting blade 34 of the cutting drill bit 31 cuts the inner circumferential surface of the hole 101 and expands the diameter (diameter expanding step S5). As a result, the diameter of the hole 101 can be expanded from the second diameter dimension φ2 to the first diameter dimension φ1.

[0029] Incidentally, when drilling holes in concrete, stone, or tiles using the cutting drill bit 31, it is necessary to perform the drilling work by simultaneously applying both the impact force of a percussion using a vibration drill driver or a hammer drill driver and the action of a rotational torque in order to prevent an extreme decrease in work efficiency. However, the work using the cutting drill bit 31 in this embodiment is not the work of drilling the hole 101, but the work of cutting the inner peripheral surface of the hole 101 and enlarging the diameter, so that the work can be efficiently performed by the quiet drilling work by the action of the rotational torque without the impact force. In addition, the drilling work using the cutting drill bit 31 can drill the hole 101 with small variation in diameter dimension.

[0030] 9, the worker inserts and fixes the metal-based post-installed anchor 110 or the adhesive-based post-installed anchor 110 into the hole 101 (anchor installation step S6). As described above, the hole 101 can be made to have a small variation in diameter dimension by the above-mentioned diameter expansion step, so that the hole 101 can be formed to have a fixed diameter within a predetermined tolerance suitable for the installation of the metal-based post-installed anchor or the adhesive-based post-installed anchor, and a decrease in the pull-out strength of the metal-based post-installed anchor and the adhesive-based post-installed anchor can be suppressed.

[0031] As described above, the drilling method according to the present embodiment is a method for drilling a hole 101 having a first diameter dimension φ1 in a drilling target 100, and includes a drilling step S3 of rotating a grinding drill bit 21 having a grinding blade 24 having a second diameter dimension φ2 smaller than the first diameter dimension φ1 to form the hole 101 in the drilling target 100, and a diameter enlarging step S5 of rotating a cutting drill bit 31 having a cutting blade 34 having the first diameter dimension φ1 to cut the inner circumferential surface of the hole 101 and enlarge the diameter. This makes it possible to drill a hole with low noise and small variation in diameter dimension.

[0032] (Modification) In the above embodiment, male threads are formed on the mounting portion 25 of the grinding drill bit 21 and the mounting portion 35 of the cutting drill bit 31, and female threads are formed on the mounted portion 44 of the common shaft 41, but this is not limited to the above. Alternatively, female threads may be formed on the mounting portion 25 of the grinding drill bit 21 and the mounting portion 35 of the cutting drill bit 31, and male threads may be formed on the mounted portion 44 of the common shaft 41.

[0033] (List of embodiments) Embodiment 1: A method for drilling a hole having a first diameter dimension in a drilling target, comprising: a drilling step of rotating a grinding drill bit having a grinding blade with a second diameter dimension smaller than the first diameter dimension to form a hole in the drilling target; and a step of rotating a cutting drill bit having a cutting blade of the first diameter dimension to cut and enlarge the inner surface of the hole.

[0034] With this configuration, holes can be drilled with low noise and small variation in diameter.

[0035]

[0023] Embodiment 2: The method further includes, before the drilling step, preparing the grinding drill bit, the cutting drill bit, and a common shaft; The grinding drill bit has a distal end including the grinding blade and a proximal end including a mounting portion; The cutting drill bit has a distal end including the cutting blade and a proximal end including a mounting portion; The common shaft has a tip portion including a mounting portion to which the mounting portion of the grinding drill bit or the mounting portion of the cutting drill bit is selectively attached, and a base end portion including a shank portion to be attached to a drill driving device, In the drilling step, the attachment portion of the grinding drill bit is attached to the attached portion of the common shaft, and the common shaft is rotated by the drill driving device to rotate the grinding drill bit, The method further includes a replacement step of removing the grinding drill bit from the common shaft after the drilling step and before the expanding step, and attaching the cutting drill bit to the common shaft by attaching the mounting portion of the cutting drill bit to the mounting portion of the common shaft; The drilling method of embodiment 1, wherein in the expanding step, the mounting portion of the cutting drill bit is attached to the mounted portion of the common shaft and the common shaft is rotated by the drill driving device, thereby rotating the cutting drill bit.

[0036] According to this configuration, the grinding blade can be replaced with the cutting blade and the diameter expanding step can be performed quickly, thereby shortening the operation time. Also, the equipment for rotating the grinding blade and the cutting blade can be shared, thereby reducing the equipment required for the drilling operation.

[0037] Embodiment 3: A method for drilling a hole according to embodiment 1 or 2, wherein the object to be drilled is concrete, stone or tile.

[0038] With this configuration, holes can be drilled in concrete, stone, or tile with low noise and small variation in diameter.

[0039]

[0023] Embodiment 4: The grinding blade comprises a metal bonded diamond wheel; 3. The method of claim 1 or 2, wherein the cutting blade comprises a cemented carbide.

[0040] This configuration makes it possible to more appropriately drill holes with less noise and less variation in diameter.

[0041] Embodiment 5: After carrying out the drilling method according to embodiment 1 or 2, The method for installing a post-installed anchor includes an anchor installation step of inserting and fixing a metal-based post-installed anchor or an adhesive-based post-installed anchor into the hole.

[0042] According to this configuration, the metal-based post-installed anchor or the adhesive-based post-installed anchor can be properly installed with low noise.

[0043] Embodiment 6: A cutting drill bit having a distal end with a cutting edge of a first diameter dimension and a proximal end including a mounting portion; a grinding drill bit having a tip end with a grinding blade having a second diameter dimension smaller than the first diameter dimension and a base end including a mounting portion; A drilling tool comprising a common shaft having a tip portion including a mounting portion to which the mounting portion of the grinding drill bit or the mounting portion of the cutting drill bit is selectively attached, and a base portion including a shank portion that is attached to a drill driving device.

[0044] According to this configuration, after performing grinding work, which can be performed with low noise, it is possible to quickly switch to cutting work, which has small variation in diameter dimension, and perform diameter setting work.

[0045]

[0023] Embodiment 7: The grinding blade comprises a metal bonded diamond wheel; 7. The drilling tool of embodiment 6, wherein the cutting blade comprises a cemented carbide.

[0046] This configuration makes it possible to more appropriately drill holes with less noise and less variation in diameter.

[0047] Embodiment 8: The attachment portion of the grinding drill bit and the attachment portion of the cutting drill bit are formed with one of a male thread and a female thread; The other of the male thread or the female thread is formed on the mounting portion of the common shaft, 8. The drilling tool of claim 6 or 7, wherein the grinding drill bit or the cutting drill bit is selectively attached to the shared shaft by interlocking the male and female threads.

[0048] This configuration allows the drill bit to be quickly replaced.

[0049] From the above description, many improvements and other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the above description should be construed as merely illustrative and is provided for the purpose of teaching those skilled in the art the best mode for carrying out the present invention. Details of the structure and / or function thereof may be substantially changed without departing from the spirit of the present invention. [Explanation of symbols]

[0050] 1 Drilling System 1 First diameter φ 3 Drill drive unit 20 Drilling tool 21 Grinding Drill Bits 22 Tip 23 Proximal end 24 Grinding blade 25 Mounting part 26 Through hole 31 Cutting Drill Bit 32 Tip 33 Proximal end 34 Cutting blade 35 Mounting part 41 Shared axis 42 Tip 43 Proximal end 44 Mounting part 45 Shank 100 Perforation Target 101 holes 110 Post-installed anchor

Claims

1. A drilling method for drilling a hole having a first diameter dimension in a drilling target, comprising: a drilling step of rotating a grinding drill bit having a grinding blade with a second diameter dimension smaller than the first diameter dimension to form a hole in the drilling target; a step of rotating a cutting drill bit having a cutting blade of the first diameter dimension to cut and enlarge the inner circumferential surface of the hole; A drilling method comprising:

2. The method further includes, before the drilling step, preparing the grinding drill bit, the cutting drill bit, and a common shaft; The grinding drill bit has a distal end including the grinding blade and a proximal end including a mounting portion; The cutting drill bit has a distal end including the cutting blade and a proximal end including a mounting portion; The common shaft has a tip portion including a mounting portion to which the mounting portion of the grinding drill bit or the mounting portion of the cutting drill bit is selectively attached, and a base end portion including a shank portion to be attached to a drill driving device, In the drilling step, the attachment portion of the grinding drill bit is attached to the attached portion of the common shaft, and the common shaft is rotated by the drill driving device to rotate the grinding drill bit, The method further includes a replacement step of removing the grinding drill bit from the common shaft after the drilling step and before the expanding step, and attaching the cutting drill bit to the common shaft by attaching the mounting portion of the cutting drill bit to the mounting portion of the common shaft; 2. The drilling method according to claim 1, wherein in the expanding step, the cutting drill bit is rotated by rotating the common shaft with the drill driving device while the mounting portion of the cutting drill bit is attached to the mounting portion of the common shaft.

3. 3. The drilling method according to claim 1, wherein the object to be drilled is concrete, stone or tile.

4. The grinding blade comprises a metal bonded diamond wheel; The method of claim 1 or 2, wherein the cutting blade comprises a cemented carbide.

5. After carrying out the drilling method according to claim 1 or 2, The method for installing a post-installed anchor includes an anchor installation step of inserting and fixing a metal-based post-installed anchor or an adhesive-based post-installed anchor into the hole.

6. a cutting drill bit having a distal end with a cutting edge of a first diameter dimension and a proximal end including a mounting portion; a grinding drill bit having a tip end with a grinding blade having a second diameter dimension smaller than the first diameter dimension and a base end including a mounting portion; A drilling tool comprising a common shaft having a tip portion including a mounting portion to which the mounting portion of the grinding drill bit or the mounting portion of the cutting drill bit is selectively attached, and a base portion including a shank portion that is attached to a drill driving device.

7. The grinding blade comprises a metal bonded diamond wheel; The drilling tool of claim 6 , wherein the cutting blade comprises a cemented carbide alloy.

8. The mounting portion of the grinding drill bit and the mounting portion of the cutting drill bit are formed with either a male thread or a female thread; The other of the male thread or the female thread is formed on the mounting portion of the common shaft, 8. The drilling tool according to claim 6 or 7, wherein the grinding drill bit or the cutting drill bit is selectively attached to the shared shaft by meshing of the male threads with the female threads.

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