Anchor rod with barb structure and construction method

Abstract

The invention provides an anchor rod with a barb structure and a construction method.The anchor rod comprises a hollow anchor rod body, a core rod arranged in the anchor rod body and a barb part arranged on the outer side of the anchor rod body, and the length direction of the core rod is the same as that of the anchor rod body; the multiple barb parts are arranged in the length direction of the anchor rod body at intervals, a plurality of barb pieces are arranged on each barb part at intervals, and the barb pieces are obliquely arranged on the anchor rod body. And barb pieces are arranged at the positions, corresponding to the barb parts, of the core rod. According to the anchor rod with the barb structure and the construction method, the core rod is arranged in the hollow anchor rod body, and the barb pieces and the barb pieces are matched to form a special composite stress form, so that the overall pulling resistance of the anchor rod is effectively improved, the construction cost is reduced, and the construction period is shortened; and as the designed length of the anchor rod is obviously shortened, disturbance to the surrounding environment is reduced, and pollution to the environment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an anchor rod with a barbed structure and a construction method. Background Art

[0002] One of the traditional anchoring methods is to anchor through the bonding force between the rod body, the cementing material and the surrounding rock. It is a friction anchor. As a support that changes the passive force structure into an active force structure, it can give full play to the self-stabilizing ability of the rock and soil, greatly reduce the deadweight of the reinforced structure and save engineering materials. At the same time, due to its safety and effectiveness in construction, it has been widely used in the field of geotechnical engineering.

[0003] However, the anchoring force of the anchor rod depends on the length of the anchoring section and the nature of the rock and soil in contact with the anchoring section. If it encounters strongly weathered soft rock or special weak soil, it often has shortcomings such as low pull-out force and large loss of prestress over time, which directly affects the wall protection quality and effect of the anchor support system in tunnel support applications. The expanded anchor rods developed in recent years, such as the high-pressure jet enlarged head anchor rod, have the problems of low cement soil strength and poor bond strength between the anchor body and the rod body; and the sac-type anchor rod, because of the bag wrapping, also has the problem of poor bond strength between the anchor body and the surrounding soil and loose compression end. At the same time, with the increasing efforts of people to develop underground space in recent years, under the conditions of complex surrounding environment, the design length of traditional anchor rods (anchor cables) is obviously constrained by the building red line. Therefore, how to improve the pull-out bearing capacity and support reliability of traditional anchor rods and ensure construction quality and safety is an urgent problem to be solved. Summary of the invention

[0004] In view of this, the present invention aims to propose an anchor rod with a barbed structure and a construction method to solve the problems of low pull-out bearing capacity and support reliability of existing anchor rods and construction methods.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] In the first aspect, the present invention provides an anchor rod with a barb structure, comprising a hollow anchor rod body, a core rod arranged in the anchor rod body, and a barb portion arranged on the outside of the anchor rod body, the length direction of the core rod is the same as the length direction of the anchor rod body, a plurality of barb portions are arranged at intervals along the length direction of the anchor rod body, each barb portion is provided with a plurality of barb pieces at intervals, and each barb piece is obliquely arranged on the anchor rod body; a barb piece is provided at a position corresponding to each barb portion on the core rod, the barb piece is obliquely arranged on the core rod, the inclination direction of the barb piece is the same as the inclination direction of the barb piece, and the anchor rod body is provided with an opening for facilitating the barb piece to extend out of the anchor rod body.

[0007] Furthermore, the barb members are arranged in a plurality of groups at intervals along the length direction of the barb portion, each group of barb members includes a plurality of barb members evenly arranged along the circumference of the barb portion, and the barb members in two adjacent groups of barb members are staggered.

[0008] Furthermore, the barb members are arranged in a plurality of groups in a fish scale shape, and each group of barb members includes a plurality of barb members arranged at intervals along the circumference of the barb portion.

[0009] Furthermore, a groove that can cooperate with the barb is provided at a position corresponding to the barb portion on the inner side of the anchor rod body, the length direction of the groove is the same as the length direction of the anchor rod body, the grooves and the openings are arranged one by one, and each groove is connected to its corresponding opening.

[0010] Furthermore, at least six barbs are evenly arranged along the circumference of the core rod, the openings are arranged in one-to-one correspondence with the barbs, and the openings are staggered along the length direction of the anchor rod body.

[0011] Furthermore, six barbs are evenly arranged along the circumference of the core rod, wherein the four barbs above the core rod correspond to the first section of the core rod, and the two barbs below the core rod correspond to the second section of the core rod, and the first section and the second section of the core rod are spaced apart.

[0012] Furthermore, the core rod is coaxially arranged with the anchor rod body.

[0013] In a second aspect, the present invention further provides a method for constructing an anchor rod with a barbed structure, comprising the following steps:

[0014] S1. Drilling a hole according to a preset hole position and making the hole depth reach the preset anchoring top point of the anchor rod;

[0015] S2, cleaning the formed hole, removing all rock powder and water in the formed hole out of the hole;

[0016] S3, using a reaming drill bit to reame the cleaned hole, wherein the reaming position corresponds to the barb piece and the preset anchoring vertex of the anchor rod, so that the barb piece can extend into the reamed hole;

[0017] S4, after the hole is expanded, the expansion drill is placed at the bottom of the hole, and water is added to the expanded hole until the hole mouth overflows, and then gas is added for cleaning; wherein, during the gas cleaning process, the expansion drill needs to be repeatedly slowly lifted and sent to the bottom of the hole at least twice, so that the sediment in the hole can be effectively blown out;

[0018] S5, after repeating step S4 at least twice, the reaming drill bit is removed from the hole to obtain a cleaned hole;

[0019] S6. Place the anchor body in the cleaned hole; wherein, during the placement of the anchor body, first push the barb at one end of the core rod toward the preset anchoring vertex to push the anchor body out of the core rod, so that the barb at the end of the core rod extends into the expanded hole corresponding to the preset anchoring vertex, and then continue to push the anchor body into the hole while pulling the core rod back in the opposite direction, so that the barb in the anchor body extends out of the anchor body along the opening on the anchor body, and finally extends into the remaining expanded holes.

[0020] Furthermore, after step S6, the construction method further comprises the following steps:

[0021] S7. Adjust the anchor body so that the center of the anchor body is consistent with the center of the hole, and then inject bonding material into the hole and the anchor body.

[0022] Furthermore, the step S2 specifically includes the following steps:

[0023] High-pressure air is used to clean the borehole, and all rock powder and water in the borehole are removed from the hole; the wind pressure of the high-pressure air is 0.2-0.4MPa.

[0024] Compared with the prior art, the anchor rod with a barbed structure and the construction method described in the present invention have the following advantages:

[0025] (1) The anchor rod with a barb structure and the construction method described in the present invention have the advantages of simple structure, light weight, easy assembly and construction, and high structural strength. By arranging a barb on the anchor rod body, and arranging a hook that can extend out of the anchor rod body on the core rod in the anchor rod body, and using the barb and the barb to cooperate with the soil layer, the pull-out resistance of the joint between the anchor rod as a whole and the soil layer is improved, which can effectively improve the shortcomings of the current conventional tension-type prestressed anchor rods in special soil layers. At the same time, by arranging a core rod in the hollow anchor rod body, and using the barb and the barb to cooperate to form a special composite force form, the pull-out resistance of the anchor rod as a whole is also effectively improved, the project cost is reduced, the construction period is saved, and as the design length of the anchor rod is significantly shortened, the disturbance to the surrounding environment is reduced, the pollution to the environment is reduced, and the social benefits are significant.

[0026] (2) The present invention discloses an anchor rod with a barb structure and a construction method, wherein the construction method can effectively shorten the construction period, improve the pull-out bearing capacity and support reliability of the anchor rod, and ensure the construction quality and safety. This construction method relies on the local expansion of the rock formation at the end of the anchor rod entering the rock and the middle section of the anchor rod as needed, using an anchor rod with a fish-scale barb structure intermittently processed on the outside, and inserting a core rod that can form a barb into the hollow anchor rod. The rock formation is anchored by forming a strong bonding force with the surrounding rock through the subsequent addition of a cementing material. This construction method has a good construction effect when encountering special geological conditions or complex surrounding environments, and can effectively improve the shortcomings of existing anchor rod construction methods in the application of special soil layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a schematic structural diagram of an anchor rod with a barb structure according to Embodiment 1 of the present invention;

[0029] Figure 2 for Figure 1 Side view of

[0030] Figure 3 A schematic diagram of a process of constructing an anchor rod with a barbed structure according to a second embodiment of the present invention;

[0031] Figure 4 It is a structural schematic diagram of a barb piece sliding along a groove in an anchor rod construction method with a barb structure according to a second embodiment of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the cross section of the anchor rod body in the anchor rod construction method with a barbed structure according to the second embodiment of the present invention;

[0033] Figure 6 It is a structural schematic diagram of a method for constructing an anchor rod with a barb structure described in Embodiment 2 of the present invention when a barb piece extends out of an opening.

[0034] Description of reference numerals:

[0035] 1. Anchor rod body; 2. Core rod; 3. Hook piece; 4. Barb piece; 5. Hole expansion; 6. Normal drilling part; 7. Binder; 8. Groove; 9. Opening hole; 10. Preset anchor rod anchoring vertex. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] Embodiment 1

[0038] Figure 1 This is a schematic diagram of the structure of an anchor rod with a barb structure according to Embodiment 1 of the present invention. Figure 1 This anchor includes a hollow anchor body 1, a core rod 2 arranged in the anchor body 1, and a barb portion arranged on the outside of the anchor body 1, the length direction of the core rod 2 is the same as the length direction of the anchor body 1, and the barb portions are arranged at intervals along the length direction of the anchor body 1, and each barb portion is provided with a plurality of barb pieces 4 at intervals, and each barb piece 4 is obliquely arranged on the anchor body 1; a barb piece 3 is provided at a position corresponding to each barb portion on the core rod 2, and the barb piece 3 is obliquely arranged on the core rod 2, and the oblique direction of the barb piece 3 is the same as the oblique direction of the barb piece 4, and the anchor body 1 is provided with an opening for facilitating the barb piece 3 to extend out of the anchor body 1.

[0039] Exemplarily, the anchor body 1 includes a normal drilling portion 6 and a barb portion, wherein the normal drilling portion 6 is arranged between two adjacent barb portions, wherein the normal drilling portion 6 is a fully threaded seamless steel pipe, and the barb portion can be thickened during the manufacture of the fully threaded seamless steel pipe to facilitate subsequent processing of the barb piece 4. Those skilled in the art can discontinuously arrange the barb portion according to actual needs.

[0040] In actual application, a thickened section can be intermittently arranged outside the anchor body 1, and then a barb 4 can be processed on the thickened section. One end of the barb 4 is fixed on the anchor body 1, and the other end is arranged toward the anchoring free end of the anchor body 1.

[0041] Preferably, the barb members 4 are arranged in multiple groups at intervals along the length direction of the barb portion, each group of barb members 4 includes multiple barb members 4 evenly arranged along the circumference of the barb portion, and the barb members 4 in two adjacent groups of barb members 4 are staggered. Exemplarily, the barb members 4 are arranged in multiple groups in a fish scale shape, and each group of barb members 4 includes multiple barb members 4 arranged at intervals along the circumference of the barb portion.

[0042] Figure 2 for Figure 1 Side view of the . Figure 2In actual application, there are multiple groups of barbs 4 arranged in a fish scale shape, each group of barbs 4 is annular and coaxially arranged with the anchor body 1, each group of barbs 4 is spaced apart by the length of a barb 4 along the length direction of the anchor body 1, and each barb 4 in each group of barbs 4 is spaced apart by half the length of the barb 4, and each barb 4 in two adjacent groups of barbs 4 is staggered to form a tight fish scale-like barb structure on the barb part, which is beneficial to improving the pull-out bearing capacity and support reliability of the anchor body 1.

[0043] Preferably, a groove that can cooperate with the hook piece 3 is provided at a position corresponding to the barb portion on the inner side of the anchor body 1, and the length direction of the groove is the same as the length direction of the anchor body 1. The grooves and the openings 9 are arranged one by one, and each groove is connected to the corresponding opening 9.

[0044] For example, the groove can extend toward the anchoring free end of the anchor rod body 1 to facilitate the movement and adjustment of the barb 3 and the core rod 2. By providing the groove on the inner wall of the anchor rod body 1, the groove can play a good guiding role for the barb 3, facilitating the alignment, assembly and movement of the barb 3 on the core rod 2, and facilitating the construction personnel to construct the anchor rod, so that the barb 3 can stably pass through the opening 9 and extend out of the anchor rod body 1 during the anchor rod construction process, which is conducive to improving the construction efficiency of the anchor rod.

[0045] In actual application, the outer side of the anchor rod body 1 is circular, and the opening 9 is an inclined hole inclined from the inside of the anchor rod body 1 along the anchoring free end of the anchor rod body 1, and the inner side of the opening is an oblong hole along the groove toward the anchoring end of the anchor rod body 1, so that the hook piece 3 on the core rod 2 can slide in, which is conducive to further reducing the construction difficulty of this anchor rod.

[0046] Preferably, at least six barbs 3 are evenly arranged along the circumference of the core rod 2, the openings 9 are arranged one-to-one with the barbs 3, and the openings 9 are staggered along the length direction of the anchor body 1. Exemplarily, six barbs 3 are evenly arranged along the circumference of the core rod 2, wherein the four barbs 3 above the core rod 2 are arranged corresponding to the first cross section of the core rod 2, and the two barbs 3 below the core rod 2 are arranged corresponding to the second cross section of the core rod 2, and the first cross section of the core rod 2 is arranged at intervals from the second cross section.

[0047] In actual application, the outer side of the anchor body 1 is intermittently processed into a fish scale-like barb, and six openings 9 are opened in the middle of the barb area, which are evenly distributed at 60 degrees on the circumference. In terms of quantity, there are four openings 9 on the top and two openings 9 on the bottom, and a certain distance is spaced between the upper and lower openings 9, which can effectively prevent too many openings 9 on the same cross section of the anchor body 1 from causing the cross-sectional strength to be lower than that of the normal drilling part, thereby ensuring the reliability of this anchor.

[0048] In addition, the two barb pieces 3 below the core rod 2 can be slightly longer than the two barb pieces 3 above the core rod 2, so that after the anchor rod is installed, the barb pieces 3 below the core rod 2 can form an array of legs in groups of two, thereby supporting the anchor rod and making the geometric center of the anchor rod located at the geometric center position of the drill hole.

[0049] Preferably, the core rod 2 is coaxially arranged with the anchor body 1. By coaxially arranging the core rod 2 with the anchor body 1, the core rod 2, the anchor body 1, and the geometric center of the drill hole can be on the same straight line, which is conducive to further improving the pull-out bearing capacity of the anchor after construction.

[0050] In actual application, the end of the anchor rod entering the rock and the rock formation in the middle section of the anchor rod are partially enlarged as needed, and the outer side is intermittently processed into a fish scale-like barb 4, and a core rod 2 that can form a hook 3 is inserted into the hollow anchor rod. Through the subsequent addition of bonding material 7, a strong bonding force is formed between the surrounding rock to anchor the rock formation.

[0051] The anchor rod with a barb structure described in this embodiment has the advantages of simple structure, light weight, easy assembly and construction, and high structural strength. By arranging a barb on the anchor rod body, and arranging a hook that can extend out of the anchor rod body on the core rod in the anchor rod body, and using the barb and the barb to cooperate with the soil layer, the pull-out resistance of the joint between the anchor rod as a whole and the soil layer is improved, which can effectively improve the shortcomings of the current conventional tension-type prestressed anchor rods in special soil layers. At the same time, by arranging a core rod in the hollow anchor rod body, and using the barb and the barb to cooperate to form a special composite force form, the pull-out resistance of the anchor rod as a whole is also effectively improved, the project cost is reduced, the construction period is saved, and as the design length of the anchor rod is significantly shortened, the disturbance to the surrounding environment is reduced, the pollution to the environment is reduced, and the social benefits are significant.

[0052] Embodiment 2

[0053] Figure 3 This is a schematic diagram of a construction method of an anchor rod with a barbed structure according to the second embodiment of the present invention. This embodiment provides a construction method based on the above embodiment. Figure 3 , this construction method specifically includes the following steps:

[0054] S1. Drill holes according to the preset hole positions, and make the hole depth reach the preset anchor point. Specifically, before construction, the preset hole positions can be positioned according to the design requirements, and the drilling rig can be used to align the preset hole positions and adjust the angle. The drilling rig feet should be stable before drilling holes. After the drilling rig is positioned and the angle is adjusted, drilling can be performed. The hole diameter is determined according to the anchor rod diameter to achieve the assembly of the anchor rod, and the hole depth needs to reach the anchor point.

[0055] S2. Clean the formed hole, and remove all rock powder and water in the formed hole out of the hole.

[0056] Specifically, the above step S2 specifically includes the following steps:

[0057] Use high-pressure air to clean the hole, and remove all the rock powder and water in the hole; the wind pressure of the high-pressure air is 0.2-0.4MPa. By using high-pressure air to clean the hole, and removing all the rock powder and water in the hole, the bonding strength between the cement mortar and the rock and soil of the hole wall can be improved.

[0058] S3, using a reaming drill bit to reame the cleaned hole, the reaming position corresponds to the barb piece and the preset anchoring vertex of the anchor rod, so that the barb piece can extend into the reamed hole.

[0059] Specifically, after the drilling rig completes the hole forming and blowing, the reaming drill bit should be replaced for hole reaming. The hole reaming is carried out by adding water. The reaming speed should be controlled during the reaming process and the hole reaming should not be forced. The reaming spacing can be controlled according to the spacing of the barbs on the core rod, and the reaming length is controlled by the required length of the core rod barbs, so that the barbs can extend into the reamed hole.

[0060] S4. After the hole expansion is completed, the expansion drill bit is placed at the bottom of the hole, and water is added to the expanded hole until it overflows from the hole mouth, and then air is added for cleaning; wherein, during the air cleaning process, the expansion drill bit needs to be repeatedly and slowly lifted and sent to the bottom of the hole at least twice, so that the sediment in the hole can be effectively blown out.

[0061] Specifically, after the hole is expanded, the expansion drill bit is placed at the bottom of the hole, water is added until the hole mouth overflows, and then air is added for cleaning. During the air cleaning process, the expansion drill bit should be slowly lifted to ensure that the sediment in the hole can be effectively blown out as much as possible, and the drill bit should be repeatedly lifted and sent to the bottom of the hole two or three times.

[0062] S5. After repeating step S4 at least twice, the reaming drill bit is removed from the hole to obtain a cleaned hole. Specifically, after the hole is cleaned once in step S4, water injection and hole cleaning can be performed two to three times to ensure the cleaning effect.

[0063] S6. Place the anchor body in the cleaned hole; wherein, during the placement of the anchor body, first push the barb at one end of the core rod toward the preset anchoring vertex to push the anchor body out of the core rod, so that the barb at the end of the core rod extends into the expanded hole corresponding to the preset anchoring vertex, and then continue to push the anchor body into the hole while pulling the core rod back in the opposite direction, so that the barb in the anchor body extends out of the anchor body along the opening on the anchor body, and finally extends into the remaining expanded holes.

[0064] Figure 4 This is a schematic diagram of the structure of the barb member sliding along the groove in the anchor rod construction method with a barb structure according to the second embodiment of the present invention. Figure 4 During the placement of the anchor body 1, the groove 8 can be used to accommodate the barb 3, preventing the barb 3 from extending out of the anchor body 1 and affecting the placement of the anchor body 1, thereby reducing the construction difficulty of the anchor body 1.

[0065] Figure 5 This is a structural schematic diagram of the cross section of the anchor rod body in the anchor rod construction method with a barbed structure according to the second embodiment of the present invention. Figure 5 Six grooves 8 are evenly arranged along the circumference of the anchor body 1.

[0066] Figure 6 This is a schematic diagram of the structure of the anchor rod construction method with a barb structure in the second embodiment of the present invention when the barb extends out of the opening. Figure 6 After the anchor body 1 is placed in the hole, the barb 3 at one end of the core rod 2 toward the preset anchor rod anchoring vertex 10 can be pushed out of the anchor body 1, so that the barb 3 at the end of the core rod 2 extends into the expanded hole 5 corresponding to the preset anchor rod anchoring vertex 10, and then the anchor body 1 is continued to be pushed into the hole while the core rod 2 is pulled back in the reverse direction, so that the barb 3 in the anchor body 1 extends out of the anchor body 1 along the opening on the anchor body 1, and finally extends into the remaining expanded holes 5.

[0067] Preferably, after step S6, the construction method further comprises the following steps:

[0068] S7. Adjust the anchor body 1 so that the center of the anchor body 1 is consistent with the center of the hole, and then inject the bonding material 7 into the hole and the anchor body 1. Exemplarily, the bonding material 7 can be cement mortar, or other bonding materials 7 can be selected according to actual needs. Those skilled in the art can select according to actual needs, which will not be repeated here. By injecting the bonding material 7 into the hole and the anchor body 1, not only can the stable bonding between the anchor body 1 and the inner wall of the hole be achieved, but also the stable bonding between the core rod 2 and the anchor body 1 can be achieved, so that the core rod 2, the anchor body 1, and the hole form a stable anchoring structure.

[0069] The anchor rod construction method with a barb structure described in this embodiment can effectively shorten the construction period, improve the pull-out bearing capacity and support reliability of the anchor rod, and ensure the construction quality and safety. This construction method relies on the local expansion of the rock formation at the end of the anchor rod entering the rock and the middle section of the anchor rod as needed, using the anchor rod with the outer side intermittently processed into a fish scale-like barb structure, and inserting a core rod that can form a barb into the hollow anchor rod. The subsequent addition of cementing materials forms a strong bonding force with the surrounding rock to anchor the rock formation. This construction method has a good construction effect when encountering special geological conditions or complex surrounding environments, and can effectively improve the shortcomings of the existing anchor rod construction method in the application of special soil layers.

[0070] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An anchor rod with a barbed structure, characterized in that: It includes a hollow anchor rod body, a core rod arranged in the anchor rod body, and a barb portion arranged on the outer side of the anchor rod body, the length direction of the core rod is the same as the length direction of the anchor rod body, a plurality of barb portions are arranged at intervals along the length direction of the anchor rod body, each barb portion is arranged at intervals on a plurality of barb pieces, and each barb piece is arranged obliquely on the anchor rod body; a barb piece is provided at a position corresponding to each barb portion on the core rod, the barb piece is arranged obliquely on the core rod, and the inclination direction of the barb piece is the same as that of the barb piece, and the anchor rod body is provided with an opening for facilitating the barb piece to extend out of the anchor rod body.

2. The anchor rod with a barb structure according to claim 1, characterized in that: The barb members are arranged in a plurality of groups at intervals along the length direction of the barb portion, each group of barb members comprises a plurality of barb members evenly arranged along the circumference of the barb portion, and the barb members in two adjacent groups of barb members are staggered.

3. The anchor rod with a barb structure according to claim 2, characterized in that: The barb pieces are arranged in a plurality of groups in a fish scale shape, and each group of barb pieces includes a plurality of barb pieces arranged at intervals along the circumference of the barb portion.

4. The anchor rod with a barb structure according to claim 1, characterized in that: A groove that can cooperate with the barb is provided at a position corresponding to the barb portion on the inner side of the anchor rod body. The length direction of the groove is the same as the length direction of the anchor rod body. The grooves and openings are arranged in a one-to-one correspondence, and each groove is connected to its corresponding opening.

5. The anchor rod with a barb structure according to claim 4, characterized in that: At least six barbs are evenly arranged along the circumference of the core rod, the openings are arranged in one-to-one correspondence with the barbs, and the openings are staggered along the length direction of the anchor rod body.

6. The anchor rod with a barb structure according to claim 5, characterized in that: Six barbs are evenly arranged along the circumference of the core rod, wherein the four barbs above the core rod correspond to the first section of the core rod, and the two barbs below the core rod correspond to the second section of the core rod, and the first section and the second section of the core rod are spaced apart.

7. The anchor rod with a barb structure according to claim 1, characterized in that: The core rod is coaxially arranged with the anchor rod body.

8. A method for constructing an anchor rod with a barbed structure, characterized in that: The anchor rod with a barb structure according to any one of claims 1 to 7 comprises the following steps: S1. Drilling a hole according to a preset hole position and making the hole depth reach the preset anchoring top point of the anchor rod; S2, cleaning the formed hole, removing all rock powder and water in the formed hole out of the hole; S3, using a reaming drill bit to reame the cleaned hole, wherein the reaming position corresponds to the barb piece and the preset anchoring vertex of the anchor rod, so that the barb piece can extend into the reamed hole; S4, after the hole is expanded, the expansion drill is placed at the bottom of the hole, and water is added to the expanded hole until the hole mouth overflows, and then gas is added for cleaning; wherein, during the gas cleaning process, the expansion drill needs to be repeatedly slowly lifted and sent to the bottom of the hole at least twice, so that the sediment in the hole can be effectively blown out; S5, after repeating step S4 at least twice, the reaming drill bit is removed from the hole to obtain a cleaned hole; S6. Place the anchor body in the cleaned hole; wherein, during the placement of the anchor body, first push the barb at one end of the core rod toward the preset anchoring vertex to push the anchor body out of the core rod, so that the barb at the end of the core rod extends into the expanded hole corresponding to the preset anchoring vertex, and then continue to push the anchor body into the hole while pulling the core rod back in the opposite direction, so that the barb in the anchor body extends out of the anchor body along the opening on the anchor body, and finally extends into the remaining expanded holes.

9. The method according to claim 8, characterized in that After step S6, the construction method further comprises the following steps: S7. Adjust the anchor body so that the center of the anchor body is consistent with the center of the hole, and then inject bonding material into the hole and the anchor body.

10. The method according to claim 8 or 9, characterized in that: The step S2 specifically includes the following steps: High-pressure air is used to clean the borehole, and all rock powder and water in the borehole are removed from the hole; the wind pressure of the high-pressure air is 0.2-0.4MPa.

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