An enlarged head anchor rod structure with adaptability function

Abstract

The application discloses an expanded head anchor rod structure with self-adaptive function, which comprises an anchor rod cable body, wherein a bearing body is arranged at one end of a fixed end anchor device, a pressure bearing plate is arranged on the anchor rod cable body away from the fixed end anchor device, an elastic expanded head centering support capable of being uniformly opened in a radial direction is arranged between the bearing body and the pressure bearing plate, a guide cap is arranged at the outer end of the bearing body through connection, a triggerable constraint member is arranged at the middle part of the elastic expanded head centering support, or a trigger device is arranged between the bearing body and the anchor rod cable body, and the structure is reasonable, self-adaptive centering is realized, auxiliary support for the whole anchor rod construction process is realized, anchor rod deflection, misalignment, installation shaking and other problems are fundamentally avoided, and problems such as shaking and deviation of the anchor rod bottom which are prone to occur in the high-pressure grouting process are also avoided.

Description

Technical Field

[0001] This invention relates to an anchor structure, and more particularly to an enlarged head anchor structure with adaptive function, belonging to the field of prestressed anchor technology. Background Technology

[0002] In geotechnical engineering, mine roadways, slope protection, cavern protection, foundation pit and tunnel surrounding rock reinforcement, and other anti-tilting and tensile engineering fields, rock masses often exhibit problems such as fissures, loosening, and insufficient stability due to complex geological structures, uneven stress distribution, weathering, and erosion. These issues can easily lead to rock mass collapse, settlement, and slippage, seriously threatening construction safety and the long-term stability of structures. Anchor bolt technology, as a core technology for rock mass reinforcement and surrounding rock support, has become the mainstream technical means for rock mass reinforcement and structure strengthening both domestically and internationally due to its advantages such as convenient construction, reliable reinforcement effect, and wide applicability.

[0003] Currently, the commonly used construction process for rock mass anchor reinforcement in the industry is as follows: Precise holes are drilled on the surface of the rock mass or structure to be reinforced according to engineering design parameters. One or more anchor rods are then inserted into the boreholes. Anchoring grout is then injected into the boreholes, and pre-stress is applied to the anchor rods according to construction requirements. This ensures that the anchor rods, anchoring grout, and rock borehole walls are tightly bonded together. The tensile strength of the anchor rods and the bonding properties of the grout constrain rock mass deformation, thereby achieving reinforcement and support for loose and unstable rock masses, improving the overall bearing capacity and structural stability of the rock mass. This conventional construction process is mature, widely used, and can meet the foundation reinforcement needs of most conventional rock masses.

[0004] However, long-term engineering practice and numerous construction tests have revealed significant technical defects in existing traditional anchor bolt structures, directly restricting the quality and reinforcement effect of rock mass anchoring, with particularly prominent pain points in the industry. On the one hand, the borehole diameter for anchor bolts is generally larger than the outer diameter of the anchor bolt body. After the anchor bolt body is inserted into the borehole, there is an annular gap between the bolt body and the borehole wall. Traditional anchor bolts lack dedicated centering and self-adaptive positioning structures, and the bolt body lacks effective radial constraint inside the borehole. During the entire process of anchor bolt pushing and positioning, anchoring agent mixing, and initial grouting, the anchor bolt is easily offset, tilted, or misaligned within the borehole due to multiple factors such as the anchor bolt's own weight, uneven friction of the borehole wall, impact force of grout flow, and slight borehole deviation. This makes it impossible to ensure that the anchor bolt body coincides with and is centered on the borehole axis. Misalignment or tilting of anchor bolts directly leads to uneven distribution of grout in the borehole annular gap, with some areas having excessively thick grout and others lacking grout. This results in uneven bonding stress between the anchor bolt and the rock mass, significantly reducing the anchoring contact area and bonding strength. During prestressing, stress concentration and force shifting are likely to occur, ultimately leading to insufficient overall anchoring force and a significant reduction in the rock mass reinforcement effect. After long-term use, this can easily lead to support failure, secondary deformation of the rock mass, and other hidden dangers.

[0005] On the other hand, the bottom fixed end of traditional anchor bolts has a conventional straight structure without auxiliary or positioning supports. During grouting, the bottom of the anchor bolt is suspended and unsupported, resulting in extremely poor overall stability. High-pressure grout continuously impacts the anchor bolt body during grouting, and the grout flow disturbs the anchor bolt's posture within the borehole. The unsupported bottom of the anchor bolt is prone to swaying and shifting, further exacerbating the overall misalignment and severely compromising the installation accuracy and centering of the anchor bolt. Simultaneously, the instability at the bottom of the anchor bolt leads to uneven and incomplete grout filling during grouting, easily generating defects such as air bubbles and voids. This reduces the consolidation strength and bonding reliability of the anchoring grout, not only affecting the quality of a single anchoring operation but also significantly shortening the service life of the anchor bolt support, increasing later maintenance and rework costs, and in severe cases, causing rock mass support failure and engineering safety accidents.

[0006] In summary, existing traditional anchor structures suffer from core defects such as poor centering and positioning capabilities and insufficient stability during grouting. These defects easily lead to problems like anchor deviation, misalignment, and installation sway, resulting in uneven anchoring stress, poor grout consolidation quality, and unsatisfactory overall anchoring performance. Consequently, they cannot meet the demands for high-precision, high-stability, and high-reliability rock mass reinforcement under complex geological conditions. Therefore, developing a novel anchor structure with self-adaptive centering capabilities, providing continuous support throughout construction, and effectively avoiding anchor deviation is of significant practical importance, as it can improve the overall quality and safety of rock mass anchoring reinforcement. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of traditional anchor bolt structures, which suffer from poor centering and positioning capabilities, leading to problems such as anchor bolt skewness, misalignment, and installation swaying during construction. These issues result in uneven anchoring force, poor grout consolidation quality, and poor overall anchoring performance. This invention provides a structurally sound, self-aligning anchor bolt structure that provides auxiliary support throughout the construction process. It effectively avoids problems such as anchor bolt skewness, misalignment, and installation swaying. After installation, the anchor bolt experiences uniform force, significantly increasing the anchoring contact area and bonding strength. Furthermore, it prevents stress concentration and force displacement after prestressing, thus improving the overall quality of the anchoring reinforcement. This is an enlarged head anchor bolt structure with self-adaptive functionality.

[0008] To achieve the above-mentioned objectives, the technical solution of this invention is: an adaptive enlarged head anchor structure, comprising an anchor cable body, a fixed end anchor fixedly disposed at one end of the anchor cable body, and a tensioning end anchor fixedly disposed at the other end of the anchor cable body. A bearing body is installed at the end of the anchor cable body located at the fixed end anchor, and a pressure plate is installed on the side of the anchor cable body away from the fixed end anchor. An elastic enlarged head centering bracket capable of uniformly opening radially is installed between the bearing body and the pressure plate. A guide cap is connected to the outer end of the bearing body, and a triggerable constraint member is provided around the middle periphery of the elastic enlarged head centering bracket, or a triggering device is installed between the bearing body and the anchor cable body.

[0009] Furthermore, the elastic expansion head centering bracket includes an elastic strip and a pair of annular mounting members. Multiple elastic strips are connected between the two annular mounting members. The elastic strips are evenly distributed in a ring around the anchor cable body. Multiple adjustable positioning holes are provided on the annular mounting members.

[0010] Furthermore, multiple positioning isolation rings are spaced apart on the anchor cable body, and a grouting pipe is provided along the outer side of the anchor cable body and extends to the fixed end anchor.

[0011] Furthermore, the triggering device includes a spring and a fixing block assembly, which are mounted on the pressure plate. The elastic expansion head centering bracket is connected to the pressure plate through the fixing block assembly, and the spring is mounted on the fixing block assembly.

[0012] Furthermore, the restraints are constructed using a bundling structure with a switching device, or using water-soluble binding ropes or chemically delayed disconnection devices.

[0013] Furthermore, a compression sleeve is fixedly installed at one end of the anchor cable body located at the fixed end anchor.

[0014] Furthermore, a carrier is installed on the extrusion sleeve, and the carrier is pressed onto the extrusion sleeve by a locking nut. A pressure plate is also provided at the end of the anchor cable body, and the pressure plate is fixed to the extrusion sleeve by bolts.

[0015] Furthermore, one end of the extrusion sleeve is provided with a carrier, and the other end of the extrusion sleeve is provided with a pressure plate. The carrier and the pressure plate are connected and fixed by a connecting screw.

[0016] Furthermore, a tensioning end anchoring sleeve is fixedly installed on one end of the anchor cable at the tensioning end anchorage. A tensioning end pad and a tensioning end locking nut are installed on the tensioning end anchoring sleeve. The tensioning end locking nut presses the tensioning end pad onto the tensioning end anchoring sleeve.

[0017] Furthermore, a protective sleeve is provided between the tensioning end anchor sleeve and the outer protective sleeve of the anchor cable body, and a sealing sleeve is provided between the protective sleeve and the strands of the anchor cable body.

[0018] The beneficial effects of this invention are:

[0019] 1. This invention employs an elastically enlarged head centering bracket that can open radially and uniformly. It utilizes the arc-shaped elastic support structure of the elastic strip to achieve self-adaptive centering and provides auxiliary support throughout the construction process. This avoids problems such as anchor rod skewness, misalignment, and installation swaying. It also avoids problems such as swaying and displacement of the bottom of the anchor rod that are prone to occur during high-pressure grouting, achieving excellent performance.

[0020] 2. This invention further enhances the radial positioning capability of the anchor bolt within the borehole by distributing multiple positioning isolation rings at intervals on the anchor bolt body. Working in conjunction with the elastic enlarged head centering bracket, it ensures that the anchor bolt remains centered throughout the entire process of pushing, grouting, and consolidation, effectively improving the uniformity and density of the anchoring grout filling.

[0021] 3. This invention achieves controllable opening of the elastic enlarged head centering bracket by setting a triggerable constraint or triggering device. It maintains a contracted state before the anchor reaches the predetermined position to facilitate smooth implantation. Once in place, it triggers the opening to achieve adaptive centering. The operation is flexible and reliable, and it can adapt to different construction conditions.

[0022] 4. After installation, the anchor rods of this invention are subjected to uniform force, which greatly increases the anchoring contact area and bonding strength. After prestressing tensioning, there will be no stress concentration or force displacement problems, thus improving the overall quality of anchoring reinforcement. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0025] Figure 3 yes Figure 3 A magnified view of part A in the middle.

[0026] Figure 4 This is a schematic diagram of the structure of the centering bracket for the elastic enlarged head of the present invention.

[0027] Figure 5 yes Figure 4 A schematic diagram of the end structure.

[0028] Figure 6 This is a partial structural diagram of the tensioning end anchorage of the present invention.

[0029] Figure 7This is a schematic diagram of the first embodiment of the fixed-end anchor of the present invention.

[0030] Figure 8 This is a schematic diagram of the second embodiment of the fixed-end anchor of the present invention.

[0031] Figure 9 This is a schematic diagram of another embodiment of the elastic expansion head centering bracket of the present invention.

[0032] Figure 10 This is a schematic diagram of the structure of the annular mounting component of the present invention, which has adjustable positioning holes.

[0033] In the diagram: 1. Anchor cable body; 2. Fixed end anchor; 3. Tensioning end anchor; 4. Bearing body; 5. Elastic expansion head centering bracket; 5-1. Elastic strip; 5-2. Ring mounting piece; 6. Pressure plate; 7. Constraint piece; 8. Tensile elastic body; 9. Adjustable positioning hole; 10. Spring; 11. Fixed clamping block assembly; 12. Guide cap; 13. Extrusion sleeve; 14. Pressure plate; 15. Locking nut; 16. Bolt; 17. Connecting screw; 18. Tensioning end pad; 19. Tensioning end locking nut; 20. Tensioning end anchoring sleeve; 21. Protective sleeve; 22. Sealing sleeve; 23. Positioning isolation ring; 24. Grouting pipe; 25. Spiral reinforcement. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] See Figures 1 to 10 The present invention discloses an adaptive enlarged head anchor structure, comprising an anchor cable 1, a fixed end anchor 2 fixedly disposed at one end of the anchor cable 1, and a tensioning end anchor 3 fixedly disposed at the other end of the anchor cable 1. The structure is characterized in that: a bearing body 4 is installed at one end of the anchor cable 1 located at the fixed end anchor 2; a pressure plate 6 is installed on the side of the anchor cable 1 away from the fixed end anchor 2; an elastic enlarged head centering bracket 5 capable of radially and uniformly opening is installed between the bearing body 4 and the pressure plate 6; a guide cap 12 is connected to the outer end of the bearing body 4; a triggerable constraint member 7 is provided around the middle periphery of the elastic enlarged head centering bracket 5; or a triggering device is installed between the bearing body 4 and the anchor cable 1.

[0036] The elastic expansion head centering bracket 5 includes an elastic strip 5-1 and a pair of annular mounting parts 5-2. Multiple elastic strips 5-1 are connected between the two annular mounting parts 5-2. The elastic strips 5-1 are evenly distributed in annular shape with the anchor cable body 1 as the axis. Multiple adjustable positioning holes 9 are opened on the annular mounting parts 5-2.

[0037] Multiple positioning isolation rings 23 are distributed at intervals on the anchor cable body 1, and a grouting pipe 24 is provided along the outer side of the anchor cable body 1 and extends to the fixed end anchor 2.

[0038] The triggering device includes a spring 10 and a fixing block assembly 11. The spring 10 and the fixing block assembly 11 are mounted on the pressure plate 6. The elastic expansion head centering bracket 5 is connected to the pressure plate 6 through the fixing block assembly 11. The spring 10 is mounted on the fixing block assembly 11.

[0039] The constraint 7 adopts a bundling structure with a switching device, or a water-soluble binding rope or a chemically delayed disconnecting device.

[0040] An extrusion sleeve 13 is fixedly installed at one end of the anchor cable 1 located at the fixed end anchor 2.

[0041] The compression sleeve 13 is equipped with a bearing body 4, which is pressed onto the compression sleeve 13 by a locking nut 15. The end of the anchor cable body 1 is also provided with a pressure plate 14, which is connected and fixed to the compression sleeve 13 by bolts 16.

[0042] One end of the extrusion sleeve 13 is provided with a support body 4, and the other end of the extrusion sleeve 13 is provided with a pressure plate 14. The support body 4 and the pressure plate 14 are connected and fixed by a connecting screw 17.

[0043] The anchor cable body 1 is fixedly provided with a tension end anchor sleeve 20 at one end of the tension end anchor 3. The tension end anchor sleeve 20 is equipped with a tension end pad 18 and a tension end locking nut 19. The tension end locking nut 19 presses the tension end pad 18 onto the tension end anchor sleeve 20.

[0044] A protective sleeve 21 is provided between the tensioning end anchor sleeve 20 and the outer protective sleeve of the anchor cable body 1, and a sealing sleeve 22 is provided between the protective sleeve 21 and the cable strands of the anchor cable body 1.

[0045] Referring to the accompanying drawings, this invention employs an elastically expanding head centering structure that can open radially and uniformly. This does not affect the insertion and installation of the anchor rod into the anchoring hole. The elastically expanding head centering structure opens controllably after the anchor rod reaches the predetermined position, utilizing its unique arc-shaped elastic structure to automatically adapt to the anchoring hole. The arc-shaped structure flexibly conforms to the hole wall, achieving self-adaptive centering and providing auxiliary support throughout the anchor rod construction process. This fundamentally avoids problems such as anchor rod skewness, misalignment, and installation swaying. It also avoids the swaying and displacement problems that easily occur at the bottom of the anchor rod during high-pressure grouting, achieving unexpected performance results. The specific structure and principle are as follows:

[0046] One end of the anchor bolt cable 1 is fixedly equipped with a fixed end anchor 2. A bearing body 4 is installed at the end of the anchor bolt cable 1 located at the fixed end anchor 2. The bearing body 4 is coaxially fixed with the anchor bolt cable 1 and is used to install other connecting structures or components. A guide cap 12 is connected to the outer end of the bearing body 4. The guide cap 12 is located at the foremost end of the anchor bolt structure. The guide cap 12 is a conical shell or a shell with a ball head at the front end. It can protect the anchor bolt and fixed end anchor and other components, and prevent the anchor and support from being scratched by gravel on the borehole wall during lowering.

[0047] The bearing 4 and the fixed end anchor can be fixed in various ways, mainly the following two methods: One method involves a compression sleeve 13 fixedly installed at one end of the anchor rod 1 located at the fixed end anchor 2. The bearing 4 is installed on the compression sleeve 13, and the bearing 4 is pressed onto the compression sleeve 13 by a locking nut 15. A pressure plate 14 is also provided at the end of the anchor rod 1, and the pressure plate 14 is connected and fixed to the compression sleeve 13 by bolts 16. The other method involves a bearing 4 installed at one end of the compression sleeve 13, and a pressure plate 14 installed at the other end of the compression sleeve 13. The bearing 4 and the pressure plate 14 are connected and fixed by a connecting screw 17.

[0048] A pressure plate 6 is installed on the anchor cable 1 at a certain distance away from the fixed end anchor 2, and the pressure plate 6 is fixed coaxially with the anchor cable 1. An elastic expanding head centering bracket 5 that can open radially and uniformly is installed between the bearing body 4 and the pressure plate 6. The elastic expanding head centering bracket 5 can open multiple arc-shaped elastic support members along the radial direction of the anchor cable 1. The elastic expanding head centering bracket 5 can adopt various structural forms; the following describes in detail the structure composed of elastic strips and ring-shaped mounting members.

[0049] The elastic expansion head centering bracket 5 includes elastic strips 5-1 and a pair of annular mounting members 5-2. Multiple elastic strips 5-1 are connected between the two annular mounting members 5-2. The elastic strips 5-1 are evenly distributed in a ring around the anchor cable body 1. The elastic strips 5-1 can be made of any one of the following: spring steel strips, fiberglass elastic rods, elastic rubber strips, or corrosion-resistant composite elastic materials. To achieve better adjustability, the annular mounting members 5-2 are provided with multiple adjustable positioning holes 9. The elastic strips 5-1 can be installed in different hole positions as needed to adjust their initial position radius.

[0050] To ensure that the elastic expansion head centering bracket 5 can be reliably triggered to open, the present invention provides a triggerable constraint member 7 on the outer periphery of the middle part of the elastic expansion head centering bracket 5. Alternatively, a triggering device can be installed between the bearing body 4 and the anchor cable body 1, as detailed below:

[0051] The restraint member 7 secures the center of the elastic expanding head centering bracket 5. The restraint member 7 uses a water-soluble binding rope or a chemically delayed disconnecting device. Alternatively, it can be a cable tie structure with a switch or other releasable temporary binding structure. Once the anchor structure is in place, the restraint member 7 will dissolve upon contact with water in the concrete or the environment, causing the elastic expanding head centering bracket 5 to open under its own elastic force. Alternatively, a chemically delayed disconnecting device with a set time can be used. Once activated, the restraint member will open, and the elastic expanding head centering bracket 5 will also open under its own elastic force. This method requires no external traction and is suitable for deep holes or situations where it is inconvenient to operate the traction rope. A tensile elastic body 8 can also be connected between the two annular mounting members 5-2, utilizing the restoring force of the tensile elastic body 8 to quickly open the elastic expanding head centering bracket 5.

[0052] When a triggering device is used, the triggering device includes a spring 10 and a fixing block assembly 11. The spring 10 and the fixing block assembly 11 are installed on the pressure plate 6. The elastic expanding head centering bracket 5 is connected to the pressure plate 6 through the fixing block assembly 11. The spring 10 is installed on the fixing block assembly 11. The spring 10 or the fixing block assembly 11 is connected to one end of the traction rope. The other end of the traction rope is located outside the anchor hole. When the anchor structure is placed in place, pulling the traction rope will immediately trigger the triggering device and cause the elastic expanding head centering bracket 5 to open outward.

[0053] A tensioning end anchor 3 is fixedly installed at the other end of the anchor cable body 1. A tensioning end anchoring sleeve 20 is fixedly installed on one end of the anchor cable body 1 at the tensioning end anchor 3. A tensioning end pad 18 and a tensioning end locking nut 19 are installed on the tensioning end anchoring sleeve 20. The tensioning end locking nut 19 presses the tensioning end pad 18 onto the tensioning end anchoring sleeve 20. In addition, in order to ensure good sealing performance, a protective sleeve 21 is provided between the tensioning end anchoring sleeve 20 and the outer protective sleeve of the anchor cable body 1, and a sealing sleeve 22 is provided between the protective sleeve 21 and the cable strands of the anchor cable body 1.

[0054] Multiple positioning isolation rings 23 are spaced apart on the anchor cable body 1. A set of positioning isolation rings is arranged at a certain distance along each grid of the free section to achieve initial centering of the free section of the anchor. A grouting pipe 24 is installed on the outer side of the anchor cable body 1 and extends to the fixed end anchor 2 for high-pressure grouting.

[0055] The above description is a further detailed explanation of the present invention in conjunction with specific embodiments. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, any simple modifications and substitutions made without departing from the concept of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. An enlarged head anchor bolt structure with adaptive function, comprising an anchor bolt body (1), a fixed end anchor (2) fixedly disposed at one end of the anchor bolt body (1), and a tensioning end anchor (3) fixedly disposed at the other end of the anchor bolt body (1), characterized in that: The anchor cable body (1) is equipped with a bearing body (4) at one end of the fixed end anchor (2). A pressure plate (6) is installed on the side of the anchor cable body (1) away from the fixed end anchor (2). An elastic expanding head centering bracket (5) that can open radially uniformly is installed between the bearing body (4) and the pressure plate (6). A guide cap (12) is connected to the outer end of the bearing body (4). A triggerable constraint (7) is provided on the outer periphery of the middle part of the elastic expanding head centering bracket (5). Alternatively, a triggering device is installed between the bearing body (4) and the anchor cable body (1).

2. The enlarged head anchor bolt structure with adaptive function according to claim 1, characterized in that: The elastic expansion head centering bracket (5) includes an elastic strip (5-1) and a pair of annular mounting parts (5-2). Multiple elastic strips (5-1) are connected between the two annular mounting parts (5-2). The elastic strips (5-1) are evenly distributed in annular shape with the anchor cable body (1) as the axis. Multiple adjustable positioning holes (9) are opened on the annular mounting parts (5-2).

3. The enlarged head anchor bolt structure with adaptive function according to claim 1, characterized in that: The anchor cable body (1) is provided with multiple positioning isolation rings (23) at intervals. A grouting pipe (24) is provided along the outside of the anchor cable body (1) and extends to the fixed end anchor (2).

4. The enlarged head anchor bolt structure with adaptive function according to claim 1, characterized in that: The triggering device includes a spring (10) and a fixing block assembly (11). The spring (10) and the fixing block assembly (11) are mounted on the pressure plate (6). The elastic expansion head centering bracket (5) is connected to the pressure plate (6) through the fixing block assembly (11). The spring (10) is mounted on the fixing block assembly (11).

5. The enlarged head anchor bolt structure with adaptive function according to claim 1, characterized in that: The restraint (7) adopts a bundle structure with a switch device, or adopts a water-soluble binding rope or a chemically delayed disconnection device.

6. The enlarged head anchor bolt structure with adaptive function according to claim 1, characterized in that: The anchor cable body (1) is fixedly provided with a compression sleeve (13) at one end of the fixed end anchor (2).

7. The enlarged head anchor bolt structure with adaptive function according to claim 1, characterized in that: The compression sleeve (13) is equipped with a bearing (4), which is pressed onto the compression sleeve (13) by a locking nut (15). The end of the anchor cable (1) is also provided with a pressure plate (14), which is connected and fixed to the compression sleeve (13) by bolts (16).

8. The enlarged head anchor bolt structure with adaptive function according to claim 1, characterized in that: One end of the extrusion sleeve (13) is provided with a carrier (4), and the other end of the extrusion sleeve (13) is provided with a pressure plate (14). The carrier (4) and the pressure plate (14) are connected and fixed by a connecting screw (17).

9. The enlarged head anchor bolt structure with adaptive function according to claim 1, characterized in that: The anchor cable body (1) is fixedly provided with a tension end anchor sleeve (20) at one end of the tension end anchor (3). The tension end anchor sleeve (20) is equipped with a tension end pad (18) and a tension end locking nut (19). The tension end locking nut (19) presses the tension end pad (18) onto the tension end anchor sleeve (20).

10. The enlarged head anchor bolt structure with adaptive function according to claim 1, characterized in that: A protective sleeve (21) is provided between the tension end anchor sleeve (20) and the outer protective sleeve of the anchor cable body (1), and a sealing sleeve (22) is provided between the protective sleeve (21) and the cable strands of the anchor cable body (1).

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