Conical drill bit for self-drilling anchor rod

Abstract

A cylinder perpendicular to the conical drill bit is arranged in the middle of the bottom face of the conical drill bit, and an installation opening which penetrates through the cylinder in the axial direction of the cylinder and is in threaded connection with a hollow anchor rod is formed in the lower end face of the cylinder. A blind hole coaxially corresponding to the mounting opening is formed in the middle of the bottom face of the conical drill bit, the diameter of the blind hole is not larger than the inner diameter of the hollow anchor rod, a plurality of grouting holes communicated with the blind hole are evenly distributed in the bottom face of the conical drill bit, and a plurality of blades evenly distributed in the circumferential direction of the cylinder and perpendicular to the bottom face of the conical drill bit are arranged on a rod body of the cylinder. During drilling operation on a silty clay stratum, the cone-shaped drill bit can be used for rapid drilling and stone jacking open, and the blades are matched to conduct secondary scraping and reinforcing on a shrunk hole diameter.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering anchoring and supporting, in particular to a conical drill bit for a self-drilling anchor rod. Background Art

[0002] Self-drilling anchor rods are engineering structures used to reinforce soil or rock in underground engineering. They are usually made of steel, have threads or cutting edges, and have the ability to drill into the formation by themselves during the drilling process. In the process of anchor drilling operations in silty clay formations with high water content, the existing self-drilling anchor rods still have the following shortcomings:

[0003] 1. During the drilling operation in the silty clay stratum, due to the structural characteristics of the silty clay stratum, the drill bit does not need to have the functions of protruding rock breaking and drilling during the drilling operation. The existing anchor drill bit structure is relatively complex and the cost is high. If it is used for drilling operations in the silty clay stratum, it will cause a waste of resources;

[0004] 2. Since the silty clay layer has a high water content and poor stability, during the drilling operation, the hole wall behind the drill bit is not only very easy to shrink, but also easy to drop clay, resulting in an unstable hole wall structure, affecting the subsequent grouting and slag removal operations;

[0005] 3. The grouting holes of existing self-drilling anchors are either set on the anchor rod body or on the surface of the drill bit. During the drilling operation of the silty clay layer, the grouting holes are easily blocked by the highly viscous soil, affecting the subsequent grouting operation;

[0006] For this reason, there is an urgent need for a self-drilling anchor hammer drill bit for drilling into silty clay strata. Utility Model Content

[0007] In order to overcome the deficiencies in the background technology, the utility model discloses a conical drill bit for a self-drilling anchor rod. When drilling in silty clay formations, the conical drill bit can not only be used for rapid drilling and the jacking of stones, but also cooperates with blades to perform secondary scraping and reinforcement on the shrunken aperture.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A conical drill bit for a self-drilling anchor rod comprises a conical drill bit, a cylinder perpendicular to the conical drill bit is provided in the middle of the bottom surface of the conical drill bit, a mounting opening penetrating the cylinder along the axial direction of the cylinder and threadedly connected to the hollow anchor rod is provided on the lower end surface of the cylinder, a blind hole is provided in the middle of the bottom surface of the conical drill bit which is coaxially arranged corresponding to the mounting opening and has a diameter not greater than the inner diameter of the hollow anchor rod, a plurality of grouting holes intersecting the blind hole are evenly distributed on the bottom surface of the conical drill bit, and a plurality of blades evenly distributed along the circumference of the cylinder and perpendicular to the bottom surface of the conical drill bit are provided on the rod body of the cylinder.

[0010] Furthermore, the upper end of the blade is fixedly connected to the bottom surface of the conical drill bit, and a plurality of blades and a plurality of grouting holes on the bottom surface of the conical drill bit are staggered.

[0011] Furthermore, the outer edge of the blade is flush with the outer edge of the bottom surface of the conical drill bit.

[0012] Furthermore, the conical drill bit comprises an end head and a cone, and the end head is detachably mounted on the upper part of the cone.

[0013] Furthermore, the upper end of the terminal is an arc structure or a cross structure.

[0014] Furthermore, a plug-in block is provided on the lower surface of the end cap, a plug-in groove matched with the plug-in block is provided on the upper surface of the cone, a mounting screw hole penetrating to the plug-in groove is provided on the side wall of the cone, and a threaded hole penetrating the plug-in block and correspondingly matched with the mounting screw hole is provided on one side of the plug-in block, and the corresponding mounting screw hole and the inner thread of the threaded hole are connected with a screw for connecting the end cap and the cone.

[0015] Furthermore, the end face of the screw and the side wall of the cone are in the same plane.

[0016] Furthermore, a screw groove is provided on the end surface of the screw.

[0017] Furthermore, a reinforcement screw hole corresponding to and adapted to the installation screw hole is provided on the inner side wall of the insertion slot corresponding to the installation screw hole, and one end of the screw rod is threadedly connected to the reinforcement screw hole.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] By setting a conical drill bit, not only can drilling operations in clay strata with high water content be completed easily and conveniently, but also when encountering stones in soft strata, the stones can be pushed away;

[0020] By setting blades, when drilling in clay formations with high water content, the blades can perform secondary reinforcement and scraping on the hole wall after the cone drill bit has drilled, thereby effectively avoiding the shrinkage of the hole diameter;

[0021] By setting grouting holes on the bottom surface of the conical drill bit, it is possible to effectively avoid the grouting holes being blocked by soil or gravel during the drilling process, thereby affecting the grouting drilling operation;

[0022] By setting a detachable end head, when the conical drill bit is severely worn, it is only necessary to remove and replace the end head to continue the drilling operation, which effectively avoids the traditional method of replacing the drill bit as a whole and saves costs;

[0023] The utility model can not only use the conical drill bit to quickly drill and push open stones during drilling operations on silty clay layers, but also cooperate with the blades to perform secondary scraping and reinforcement on the shrunken aperture; the utility model has a simple structure and is easy to install and use, effectively improves the drilling efficiency and operation quality of silty clay layers, and has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model;

[0025] Figure 2 It is a top view schematic diagram of the utility model;

[0026] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0027] Figure 4 It is a schematic diagram of the cone structure of the utility model.

[0028] In the figure: 1. Conical drill bit; 2. Blade; 3. Cylinder; 4. Grouting hole; 5. Mounting port; 6. Blind hole; 7. End; 8. Threaded hole; 9. Plug-in block; 10. Plug-in slot; 11. Reinforcement screw hole; 12. Mounting screw hole; 13. Cone; 14. Screw; 15. Screw slot. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present invention and are for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction.

[0030] Please refer to the instruction manual Figure 1-4 , the utility model provides a technical solution:

[0031] Embodiment 1, a conical drill bit for a self-drilling anchor, comprising a conical drill bit 1, a cylinder 3 perpendicular to the conical drill bit 1 is provided in the middle of the bottom surface of the conical drill bit 1, a mounting opening 5 which penetrates the cylinder 3 along the axial direction of the cylinder 3 and is threadedly connected to the hollow anchor is provided on the lower end surface of the cylinder 3, a blind hole 6 which is coaxial with the mounting opening 5 and corresponds to the blind hole 6 is provided in the middle of the bottom surface of the conical drill bit 1, and a plurality of grouting holes 4 which are connected to the blind hole 6 are evenly distributed on the bottom surface of the conical drill bit 1, in order to avoid the small outer diameter of the hollow anchor The inner diameter of the blind hole 6 causes the hollow anchor rod to be inserted into the blind hole 6 to block the grouting hole 4. The diameter of the blind hole 6 is not larger than the blind hole 6 of the inner diameter of the hollow anchor rod. The rod body of the cylinder 3 is provided with a plurality of blades 2 evenly distributed along the circumference of the cylinder 3 and perpendicular to the bottom surface of the conical drill bit 1. The outer edge of the blade 2 is flush with the outer edge of the bottom surface of the conical drill bit 1. In order to ensure the stability of the blade 2 structure, the upper end of the blade 2 is fixedly connected to the bottom surface of the conical drill bit 1. The plurality of blades 2 are staggered with the plurality of grouting holes 4 on the bottom surface of the conical drill bit 1.

[0032] During the drilling operation, the conical drill bit 1 can easily and conveniently drill into the silty clay layer. When encountering a material with a higher hardness, the conical drill bit 1 can be used to push the hard block away and continue drilling. The arc structure at the end of the conical drill bit 1 can greatly improve its service life. During the drilling process of the conical drill bit 1, the rear blades 2 can perform secondary scraping and reinforcement on the hole wall at the rear of the conical drill bit 1, which not only effectively avoids the shrinkage of the hole diameter, but also provides strong support for the subsequent grouting and slag removal.

[0033] Embodiment 2: When it is necessary to replace the worn conical drill bit 1, it is often because the end of the conical drill bit 1 is severely worn. Such frequent replacement of the conical drill bit 1 causes waste of resources and greatly increases costs. In order to achieve partial replacement of the worn part of the end of the conical drill bit 1, the conical drill bit 1 includes an end 7 and a cone 13. The lower surface of the end 7 is provided with a plug-in block 9, and the upper surface of the cone 13 is provided with a plug-in groove 10 matched with the plug-in block 9. The side wall of the cone 13 is provided with a mounting screw hole 12 that passes through the plug-in groove 10. One side of the plug-in block 9 is provided with a threaded hole 8 that passes through the plug-in block 9 and corresponds to the mounting screw hole 12. The corresponding mounting screw hole 12 and the threaded hole 8 are internally threadedly connected with a screw 14 for connecting the end 7 and the cone 13. By utilizing the detachable end 7 structure, when the end 7 is severely worn, only the end 7 needs to be replaced, and there is no need to replace the cone 13, which greatly saves costs.

[0034] Embodiment three, in order to improve the firmness and stability of the connection between the end 7 and the cone 13, a reinforcement screw hole 11 corresponding to and adapted to the installation screw hole 12 is provided on the inner wall of the plug-in slot 10 corresponding to the installation screw hole 12, and one end of the screw 14 is threadedly connected to the reinforcement screw hole 11. In order to prevent the end of the screw 14 from exceeding the side wall of the cone 13 and affecting the drilling operation, the end face of the screw 14 is in the same plane as the side wall of the cone 13. In order to facilitate the rotation drive of the screw 14, a screw groove 15 is provided on the end face of the screw 14.

[0035] Embodiment 4: In order to improve the rock breaking and stone crushing effect of the end head 7, the end head 7 may also adopt a cross-shaped structure, so as to drill and crush some rocks that cannot be pushed during the drilling process.

[0036] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A conical drill bit for a self-drilling anchor, characterized in that: The invention comprises a conical drill bit (1), wherein a cylinder (3) perpendicular to the conical drill bit (1) is provided in the middle of the bottom surface of the conical drill bit (1), a mounting opening (5) penetrating the cylinder (3) along the axial direction of the cylinder (3) and being threadedly connected to a hollow anchor rod is provided on the lower end surface of the cylinder (3), a blind hole (6) coaxially arranged with the mounting opening (5) and having a diameter not greater than the inner diameter of the hollow anchor rod is provided in the middle of the bottom surface of the conical drill bit (1), a plurality of grouting holes (4) intersecting the blind hole (6) are evenly distributed on the bottom surface of the conical drill bit (1), and a plurality of blades (2) evenly distributed along the circumference of the cylinder (3) and perpendicular to the bottom surface of the conical drill bit (1) are provided on the rod body of the cylinder (3).

2. A conical drill bit for a self-drilling anchor according to claim 1, characterized in that: The upper end of the blade (2) is fixedly connected to the bottom surface of the conical drill bit (1), and a plurality of blades (2) and a plurality of grouting holes (4) on the bottom surface of the conical drill bit (1) are arranged in a staggered manner.

3. A conical drill bit for a self-drilling anchor according to claim 2, characterized in that: The outer edge of the blade (2) is flush with the outer edge of the bottom surface of the conical drill bit (1).

4. A conical drill bit for a self-drilling anchor according to claim 1, characterized in that: The conical drill bit (1) comprises an end head (7) and a cone (13), wherein the end head (7) is detachably mounted on the upper part of the cone (13).

5. A conical drill bit for a self-drilling anchor according to claim 4, characterized in that: The upper end of the end cap (7) is an arc structure or a cross structure.

6. A conical drill bit for a self-drilling anchor according to claim 4, characterized in that: The lower surface of the end head (7) is provided with a plug-in block (9), the upper surface of the cone (13) is provided with a plug-in groove (10) matched with the plug-in block (9), the side wall of the cone (13) is provided with a mounting screw hole (12) penetrating to the plug-in groove (10), and one side of the plug-in block (9) is provided with a threaded hole (8) penetrating the plug-in block (9) and correspondingly matched with the mounting screw hole (12), and the corresponding mounting screw hole (12) and the threaded hole (8) are internally threadedly connected with a screw rod (14) for connecting the end head (7) and the cone (13).

7. A conical drill bit for a self-drilling anchor according to claim 6, characterized in that: The end face of the screw (14) and the side wall of the cone (13) are in the same plane.

8. A conical drill bit for a self-drilling anchor according to claim 7, characterized in that: The end surface of the screw rod (14) is provided with a screwing groove (15).

9. A conical drill bit for a self-drilling anchor according to claim 6, characterized in that: A reinforcing screw hole (11) corresponding to and adapted to the mounting screw hole (12) is provided on the inner side wall of the insertion slot (10) corresponding to the mounting screw hole (12), and one end of the screw rod (14) is threadedly connected to the reinforcing screw hole (11).

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