Incorporating anchor agent self-drilling prestressed hollow anchor rod and its use method

Abstract

The application discloses a kind of built-in anchoring agent self-drilling prestressed hollow anchor rod and its use method, including first hollow anchor rod body and second hollow anchor rod body;The first hollow anchor rod body is equipped with cartridge, and the first hollow anchor rod body end is equipped with drill bit;Second hollow anchor rod body is connected with the first hollow anchor rod body rod transmission, and the second hollow anchor rod body is reversed when driving the first hollow anchor rod body synchronous reverse drilling.This application realizes the extrusion of cartridge and the stirring of medicine in cartridge by twice positive rotation of second anchor rod body respectively, and drilling, resin anchoring and prestress application can be realized based on the structural characteristics of anchor rod itself, without high-pressure water switching, and drilling, resin anchoring and prestress application can be continuously carried out, which greatly simplifies the construction process;Meanwhile, the extrusion condition of cartridge can be accurately reflected by the screwing amount of second hollow anchor rod body, which greatly improves the reliability of resin anchoring.

Description

Technical Field

[0001] This invention relates to the field of anchor bolt technology, and in particular to a self-drilling prestressed hollow anchor bolt with embedded anchoring agent and its application method. Background Technology

[0002] Currently, in the fields of geotechnical engineering, mining, and tunneling, anchor bolt support is commonly used, with resin anchor bolts and mortar anchor bolts being the most common types. In mine roadway support systems, resin anchor bolts have the advantages of short curing time and rapid stress application, but the cost of resin materials is very high.

[0003] The construction process of resin anchor bolts is as follows: (1) Drill anchor holes, (2) Send resin rolls into anchor holes, (3) Insert anchor bolts, (4) Rotate anchor bolts to break up resin rolls, and then use the resin rolls to anchor the bolts after they are mixed and solidified. In the second step, the resin rolls are usually pushed directly into the bottom of the anchor hole by high-pressure water or high-pressure air. However, during use, due to factors such as the anchor hole axis not being a standard straight line (i.e., the hole is not straight), the large friction between the resin rolls and the anchor hole, and the resin rolls themselves being soft and having poor guiding properties, it is difficult to deliver the resin rolls into place.

[0004] To address the aforementioned issues, existing technologies, such as patents disclosed in CN110259493B, CN114542131A, and CN109944620B, all propose hollow anchor bolts with embedded resin cartridges. While these anchor bolts can solve the problem of resin cartridge insertion, they require switching between high and low pressure water during construction. Low-pressure water is used for borehole cooling, while high-pressure water is used for resin cartridge extrusion. Furthermore, special connectors are needed to link the drilling rig and the anchor bolt. This structure undoubtedly increases the anchor bolt production cost and complicates on-site construction (e.g., requiring supporting high and low pressure water supply equipment). The process of extruding the resin cartridge using high-pressure water is not visible, often resulting in incomplete resin extrusion from the cartridge, leading to poor anchoring and resin waste. Ensuring complete resin extrusion requires a continuous supply of high-pressure water, which wastes water, and excess water flows out of the anchor hole onto the construction surface, affecting the construction environment. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a self-drilling prestressed hollow anchor rod with embedded anchoring agent and its application method. The structure is simple, achieving the embedding of the catalytic cartridge by setting two anchor rods with different diameters. Drilling is achieved by the reverse rotation of the second anchor rod body driving the first anchor rod body to rotate synchronously. The two forward rotations of the second anchor rod body respectively extrude the catalytic cartridge and agitate the agent within the cartridge. Based on the inherent structural characteristics of the anchor rod, drilling, resin anchoring, and prestressing can be achieved without high-pressure water switching, and drilling, resin anchoring, and prestressing can be performed continuously, greatly simplifying the construction process. Simultaneously, the screw-in amount of the second hollow anchor rod body accurately reflects the extrusion status of the catalytic cartridge, significantly improving the reliability of resin anchoring.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] The self-drilling prestressed hollow anchor bolt with embedded anchoring agent includes a first hollow anchor bolt body and a second hollow anchor bolt body;

[0008] The first hollow anchor rod body contains a cartridge, and the end of the first hollow anchor rod body is provided with a drill bit;

[0009] The second hollow anchor body is connected to the first hollow anchor body via a rod drive. When the second hollow anchor body reverses, it drives the first hollow anchor body to synchronously reverse and drill. When drilling reaches the target position, the second hollow anchor body rotates forward and advances axially along the first hollow anchor body, extruding the adhesive in the cartridge from the first hollow anchor body through the drill bit into the anchor hole. When the adhesive in the cartridge is completely extruded from the first hollow anchor body, the second hollow anchor body continues to rotate and drives the first hollow anchor body to synchronously rotate and stir the adhesive.

[0010] Furthermore, one end of the second hollow anchor body extends into the end of the first hollow anchor body away from the drill bit and is threadedly connected to the first hollow anchor body;

[0011] The second hollow anchor body has a backstop at one end that extends into the first hollow anchor body. The backstop is used to prevent the second hollow anchor body from reversing and exiting the first hollow anchor body.

[0012] Furthermore, the first hollow anchor body is provided with a threaded hole and a straight hole respectively. The threaded hole is located at the end of the first hollow anchor body away from the drill bit, and the explosive cartridge is located in the straight hole.

[0013] The anti-retraction part has an annular structure, and the outer diameter of the anti-retraction part is smaller than the diameter of the straight hole but larger than the diameter of the threaded hole.

[0014] Furthermore, a cylinder is provided inside the straight hole, the medicine roll is placed inside the cylinder, and a gap is provided between the cylinder and the straight hole for cooling water to pass through;

[0015] A piston is provided at one end of the cylinder near the threaded hole, and the outer diameter of the anti-reverse part is smaller than the inner diameter of the cylinder.

[0016] Furthermore, the end of the first hollow anchor rod body is provided with a cutter for cutting the medicine roll, and the cutter and the first hollow anchor rod body are separate structures.

[0017] Furthermore, the drill bit is threadedly connected to the end of the first hollow anchor rod body, and the cutter is fixed to the end of the first hollow anchor rod body through the drill bit.

[0018] Furthermore, the end of the second hollow anchor body away from the first hollow anchor body is provided with a limiting component, a driving nut and a self-locking nut in sequence along the axial direction;

[0019] The drive nut is connected to the drive component for transmission, and the drive component drives the drive nut to rotate forward or in reverse.

[0020] The self-locking nut is used to limit the axial displacement when the drive nut reverses;

[0021] When the second hollow anchor body is not fixed, the limiting component restricts the axial displacement of the drive nut when it rotates forward, and the drive nut drives the second hollow anchor body to rotate forward synchronously; when the first hollow anchor body and the second hollow anchor body are fixed by adhesive, the drive nut breaks through the limitation of the limiting component, and the drive component drives the drive nut to move axially along the second hollow anchor body and press against the pad to apply prestress to the anchor.

[0022] Furthermore, the drive nut is located at a distance X1 from the tail end of the second hollow anchor rod body. The portion from the tail end of the anchor rod to the drive nut first enters the joint body during alignment for positioning the drive component and the drive nut.

[0023] A method for using the aforementioned self-drilling prestressed hollow anchor bolt with embedded anchoring agent includes the following steps:

[0024] S10, Drilling anchor holes: The second hollow anchor body reverses and drives the first hollow anchor body and the drill bit to rotate synchronously, and the drill bit drills in;

[0025] S20, Anchor Bolt Fixing: (1) Adhesive Extrusion: After the drill bit is drilled into place, the drill bit is pressed against the bottom of the anchor hole, and then the second hollow anchor bolt body rotates forward; when the second hollow anchor bolt body rotates forward, it moves forward along the axis of the first hollow anchor bolt body and extrudes the adhesive in the cartridge from the first hollow anchor bolt body through the drill bit into the anchor hole; (2) Adhesive Stirring: When the adhesive in the cartridge is completely extruded into the first hollow anchor bolt body into the anchor hole, the second hollow anchor bolt body continues to rotate and drives the first hollow anchor bolt body to rotate synchronously to stir the adhesive; wait for t1 time until the adhesive solidifies;

[0026] S30. Prestressing application: The adhesive restricts the rotational movement of the first hollow anchor body and the second hollow anchor body, and drives the nut to continue rotating to break through the restriction of the limiting part. Then the drive nut moves towards the pad plate and moves to tighten the pad plate, thus completing the application of prestress.

[0027] S40, the driving component retracts in a straight line, and the anchoring is completed: After the prestress is applied, the driving component retracts in a straight line until it is disengaged from the driving nut, and the anchoring is completed.

[0028] The beneficial effects of this invention are:

[0029] 1) The anchor structure of this invention is simple. It achieves internal containment of the drug cartridge by setting two anchors with different diameters. Drilling is achieved by the reverse rotation of the second anchor body driving the first anchor body to rotate synchronously. The two forward rotations of the second anchor body respectively achieve the extrusion of the drug cartridge and the stirring of the drug inside the cartridge. Based on the structural characteristics of the anchor itself, drilling, resin anchoring and prestressing can be achieved without the need for high-pressure water switching. Drilling, resin anchoring and prestressing can be carried out continuously, which greatly simplifies the construction process. At the same time, the screwing-in amount of the second hollow anchor body can accurately reflect the extrusion of the drug cartridge, which greatly improves the reliability of resin anchoring.

[0030] 2) The inner surface of the cylindrical part is smoother than the inner surface of the first hollow anchor body, so the medicine roll will be pushed out more easily when the second hollow anchor body rotates forward.

[0031] 3) This invention, through the design of a drive nut, a self-locking nut, and a limiting component, achieves anchor drilling, resin anchoring, prestressing application, and anchoring all in one step. The anchor installation process is simple, fast, and highly efficient. There is no complex connection structure between the drilling rig and the anchor. When the working part of the drilling rig retracts, the anchor can be separated from the drilling rig simply by the straight retraction of the working part, without manual intervention. Furthermore, when the preload is applied, the drive nut moves within the installation cavity, while the joint body does not move linearly, thus preventing the drive nut from separating from the joint body.

[0032] 4) Because a portion of the length is reserved at the tail of the second hollow anchor rod, when the self-locking nut is assembled with the joint body, the tail of the anchor rod enters the joint body first to form a position, which prevents the anchor rod from falling out of the anchor hole when the self-locking nut and the joint body are aligned; and it can also ensure that the self-locking nut and the joint body can be automatically aligned by the drilling machine without manual intervention. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the self-drilling prestressed hollow anchor rod with embedded anchoring agent in an embodiment of the present invention;

[0034] Figure 2 A cross-sectional view of a self-drilling prestressed hollow anchor rod with embedded anchoring agent;

[0035] Figure 3 for Figure 2 Enlarged view of point A in the middle section;

[0036] Figure 4 for Figure 2 Enlarged view of section B in the middle;

[0037] Figure 5 for Figure 2 Enlarged view of point C in the middle section;

[0038] In the figure, 1. First hollow anchor body; 2. Second hollow anchor body; 3. Drug cartridge; 4. Drill bit; 5. Threaded hole; 6. Straight hole; 7. Anti-reverse part; 8. Cylinder; 9. Piston; 10. Cutter; 11. Limiting part; 12. Drive nut; 13. Self-locking nut; 14. Drive component; 15. Fixing part; 16. Limiting part; 17. Mounting cavity. Detailed Implementation

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] See Figures 1-5 The present invention provides a technical solution:

[0041] Example 1:

[0042] like Figures 1-5 As shown, the self-drilling prestressed hollow anchor bolt with embedded anchoring agent includes a first hollow anchor bolt body 1 and a second hollow anchor bolt body 2;

[0043] The first hollow anchor body 1 is provided with a cartridge 3, and the end of the first hollow anchor body 1 is provided with a drill bit 4;

[0044] like Figures 2-4 As shown, the second hollow anchor body 2 is connected to the first hollow anchor body 1 via a rod drive. When the second hollow anchor body 2 reverses, it drives the first hollow anchor body 1 to simultaneously reverse and drill. When drilling reaches the target position, the second hollow anchor body 2 rotates forward, extruding the adhesive cartridge inside the first hollow anchor body and stirring it. The extrusion and stirring process is as follows: the second hollow anchor body 2 moves forward along the axial direction of the first hollow anchor body 1, and extrudes the adhesive in the adhesive cartridge 3 from the first hollow anchor body 1 through the drill bit 4 into the anchor hole. When the adhesive in the adhesive cartridge 3 is completely extruded from the first hollow anchor body 1, the second hollow anchor body 2 continues to rotate and drives the first hollow anchor body 1 to rotate synchronously and stir the adhesive (resin).

[0045] One end of the second hollow anchor rod body 2 extends into the end of the first hollow anchor rod body 1 away from the drill bit 4 and is threadedly connected to the first hollow anchor rod body 1;

[0046] (The transmission connection between the first hollow anchor body 1 and the second hollow anchor body 2 can also be as follows: the second hollow anchor body 2 is provided with an internal thread, and the external thread of the first hollow anchor body 1 is adapted to the internal thread of the second hollow anchor body 2 (i.e., the inner hole size of the second hollow anchor body 2 is adapted to the outer diameter of the first hollow anchor body 11). In this case, only a push rod coaxial with the second hollow anchor body 2 needs to be set inside the second hollow anchor body 2 to realize the ejection of the cartridge 3 when the second hollow anchor body 2 moves forward. When setting the push rod, the outer diameter of the push rod is smaller than the diameter of the inner hole of the first hollow anchor body 1. The push rod can be a hollow rod with open ends. In this case, a retaining ring can be set at the end of the first hollow anchor body 1. When the anti-reverse part 7 contacts the retaining ring, the two together restrict the axial displacement of the second hollow anchor body 2 when it reverses.)

[0047] The second hollow anchor rod body 2 is provided with a backstop 7 at one end that extends into the first hollow anchor rod body 1. The backstop 7 is used to prevent the second hollow anchor rod body 2 from reversing and exiting the first hollow anchor rod body 1.

[0048] The first hollow anchor body 1 is provided with a threaded hole 5 and a straight hole 6 that are connected. The threaded hole 5 is located at the end of the first hollow anchor body 1 away from the drill bit 4, and the cartridge 3 is located in the straight hole 6.

[0049] The anti-retraction part 7 has an annular structure, and the outer diameter of the anti-retraction part 7 is smaller than the diameter of the straight hole 6 and larger than the diameter of the threaded hole 5.

[0050] Specifically, 1. The forward and reverse rotation of the second hollow anchor body 2 is achieved by a drilling rig. 2. Reversal of the second hollow anchor body 2 refers to the movement of the second hollow anchor body 2 in a direction that tends to move away from the first hollow anchor body 1, as shown in the figure, which is a counterclockwise rotation.

[0051] The first hollow anchor rod body 1 is provided with a cutter 10 for cutting the medicine roll 3 at its end. The cutter 10 and the first hollow anchor rod body 1 are separate structures.

[0052] The drill bit 4 is threadedly connected to the end of the first hollow anchor rod body 1, and the cutter 10 is fixed to the end of the first hollow anchor rod body 1 through the drill bit 4. The cutter 10 and the drill bit 4 can be an integrated structure (welded or fixed as one piece), or they can be separate structures. When the drill bit 4 is tightened into the first hollow anchor rod body 1, the cutter 10 is pressed between the two.

[0053] Working principle: (1) The second hollow anchor body 2 reverses. When it reverses, the anti-reverse part 7 is pressed against the end of the threaded hole 5, and the axial displacement of the second hollow anchor body 2 is restricted by the anti-reverse part 7. Therefore, the second hollow anchor body 2 drives the first hollow anchor body 1 to reverse synchronously.

[0054] (2) When the first hollow anchor body 1 reverses, it drives the drill bit 4 to drill. After drilling into place, the first hollow anchor body 1, the second hollow anchor body 2 and the drill bit 4 move horizontally toward the bottom of the anchor hole, so that the drill bit 4 is pressed against the bottom of the anchor hole.

[0055] (3) At this time, the second hollow anchor body 2 reverses direction. During this process, since the drill bit 4 is pressed against the bottom of the anchor hole, the resistance between the first hollow anchor body 1 and the bottom of the anchor hole is greater than the frictional resistance of the relative rotation of the threaded pair (the first hollow anchor body 1 and the second hollow anchor body 2); that is, the second hollow anchor body 2 is more likely to overcome the frictional resistance of the relative rotation of the threaded pair. Therefore, when the second hollow anchor body 2 rotates forward, it rotates relative to the first hollow anchor body 1, and the second hollow anchor body 2 moves forward along the axial direction of the first hollow anchor body 1.

[0056] During the forward movement of the second hollow anchor rod 2, the end of the second hollow anchor rod 2 pushes the cartridge 3 toward the cutter 10. When the cartridge 3 comes into contact with the cutter 10, as the second hollow anchor rod 2 continues to push, the cartridge 3 is cut by the cutter 10, and the (two-component) resin (passing through the drill bit 4) inside the cartridge 3 is squeezed into the anchor hole.

[0057] (4) When the second hollow anchor body 2 moves to the end of the first hollow anchor body 1, the explosive cartridge 3 inside the first hollow anchor body 1 is completely squeezed out. At this time, the second hollow anchor body 2 moves to its limit position and can no longer continue to advance along the axial direction of the first hollow anchor body 1.

[0058] As the second hollow anchor body 2 continues to rotate forward, it drives the first hollow anchor body 1 to rotate synchronously. (During this process, to ensure smoother synchronous rotation of the first and second hollow anchor bodies 1 and 2, they can be retracted a certain distance, thereby reducing the force exerted by the drill bit 4 against the bottom of the anchor hole.) The rotation of the first and second hollow anchor bodies 1 and 2 stirs the (two-component) resin within the anchor hole, thus mixing the resin and accelerating its solidification.

[0059] (5) Prestress can be applied after the resin has solidified.

[0060] The anchor structure of this invention is simple. It achieves the internal containment of the drug cartridge 3 by setting two anchors with different diameters. The reverse rotation of the second anchor body drives the first anchor body to rotate synchronously to achieve drilling. The two forward rotations of the second anchor body respectively achieve the extrusion of the drug cartridge 3 and the stirring of the drug inside the drug cartridge 3. Based on the structural characteristics of the anchor itself, drilling, resin anchoring and prestressing can be achieved without the need for high-pressure water switching. Moreover, drilling, resin anchoring and prestressing can be carried out continuously, which greatly simplifies the construction process. At the same time, the screwing amount of the second hollow anchor body 2 can accurately reflect the extrusion of the drug cartridge 3, which greatly improves the reliability of resin anchoring.

[0061] Furthermore, a cylinder 8 is provided inside the straight hole 6, the medicine roll 3 is disposed inside the cylinder 8, and a gap is provided between the cylinder 8 and the straight hole 6 for cooling water to pass through;

[0062] A piston 9 is provided at one end of the cylinder 8 near the threaded hole 5, and the outer diameter of the anti-reverse part 7 is smaller than the inner diameter of the cylinder 8.

[0063] 1. The cylinder 8 can be, but is not limited to, made of plastic. 2. As shown in the figure, a top head can also be provided at the end of the second hollow anchor rod body 2 to facilitate pushing the piston 9.

[0064] When the second hollow anchor rod 2 rotates forward and has axial displacement, the end of the second hollow anchor rod 2 pushes the piston 9, and the piston 9 pushes the cartridge 3.

[0065] The inner surface of the cylindrical 8 is smoother than the inner surface of the first hollow anchor body 1, so the medicine roll 3 will be pushed out more easily when the second hollow anchor body 2 rotates forward.

[0066] Example 2:

[0067] This embodiment is based on embodiment 1, such as... Figure 5 As shown, the second hollow anchor body 2 is provided with a limiting member 11, a driving nut 12 and a self-locking nut 13 in sequence along the axial direction at the end away from the first hollow anchor body 1; wherein, the drill bit 4, the limiting member 11, the driving nut 12 and the self-locking nut 13 are arranged in sequence along the axial direction of the (anchor body).

[0068] The drive nut 12 is connected to the drive member 14 for transmission, and the drive member 14 drives the drive nut 12 to rotate forward or in reverse.

[0069] The self-locking nut 13 is used to limit the axial displacement when the drive nut 12 reverses;

[0070] When the second hollow anchor body 2 is not fixed, the limiting member 11 restricts the axial displacement of the drive nut 12 when it rotates forward, and the drive nut 12 drives the second hollow anchor body 2 to rotate forward synchronously; when the first hollow anchor body 1 and the second hollow anchor body 2 are fixed by adhesive, the drive nut 12 breaks through the limitation of the limiting member 11, and the drive member 14 drives the drive nut 12 to move axially along the second hollow anchor body 2 and presses against the pad to apply prestress to the anchor.

[0071] Wherein: 1. The limiting member 11 includes a fixing part 15 and a limiting part 16. The fixing part 15 is fixed to the outside of the second hollow anchor rod body 2. The limiting part 16 is disposed near the driving nut 12. When the second hollow anchor rod body 2 is not fixed, the resistance between the limiting part 16 and the driving nut 12 is greater than the resistance of the drug cartridge 3 to the second hollow anchor rod body 2. When the second hollow anchor rod body 2 is fixed, the resistance between the limiting part 16 and the driving nut 12 is less than the resistance of the anchoring agent to the second hollow anchor rod body 2.

[0072] Both the limiting part 16 and the fixing part 15 are made of soft materials, such as polyolefin materials. Specifically, they can be, but are not limited to, heat shrink tubing. During the processing of heat shrink tubing, nameplate information can be engraved, and the processing of the fixing part 15 and the limiting part 16 is very simple. For example, the limiting part 16 is shaped by a hot air machine, and the heat shrink tubing is completely attached to the anchor rod to form the limiting part 16, while the fixing part 15 can be left unprocessed for the remaining part of the heat shrink tubing.

[0073] 2. The driving component 14 includes a connector body and a drilling rig, with the connector body connected to the power end of the drilling rig. The connector body has a mounting cavity 17, the cross-section of which is non-circular. The driving nut 12 is disposed within the mounting cavity 17 and adapted to fit within it. In this embodiment, the mounting cavity 17 is a regular hexagonal hole structure, but it can also be a triangular hole, a square hole, or other structures.

[0074] 3. As shown in the figure, the outer contour of the self-locking nut 13 is smaller than that of the driving nut 12, that is, there is a gap between the self-locking nut 13 and the mounting cavity 17.

[0075] Working principle: (1) Reversal of the second hollow anchor body 2: The drilling rig drives the drive nut 12 to reverse through the joint body. During this process: Since there is a gap between the joint body and the self-locking nut 13, the self-locking nut 13 is always stationary relative to the second hollow anchor body 2. When the drive nut 12 reverses, it tends to move towards the direction of the self-locking nut 13. However, due to the limitation of the self-locking nut 13, the reverse of the drive nut 12 drives the second hollow anchor body 2 to reverse synchronously to achieve drilling.

[0076] (2) The second hollow anchor body 2 rotates forward for the first time: the drilling machine drives the drive nut 12 to rotate forward through the joint body. During this process, the drive nut 12 has a tendency to move towards the drill bit 4. Due to the limitation of the front end limiter 11 of the drive nut 12, the drive nut 12 drives the second hollow anchor body 2 to rotate forward synchronously. At this time, the second hollow anchor body 2 performs the action of extruding the cartridge 3.

[0077] (3) Second hollow anchor body 2 rotates forward for the second time: After the medicine roll 3 is extruded, as mentioned above, the drive nut 12 continues to drive the second hollow anchor body 2 to rotate forward. At this time, the second hollow anchor body 2 drives the first hollow anchor body 1 to rotate forward synchronously, thereby stirring the resin (adhesive).

[0078] (4) Pre-stressing: After the resin solidifies, the hollow anchor rod body is fixed. At this time, the drive nut 12 can continue to rotate to break through the limit of the limit member 11 and move towards the pad. When the drive nut 12 moves to the top of the pad, the pre-stressing is completed. After that, the drilling rig can be separated from the anchor rod by simply retracting the drilling rig in a straight line.

[0079] This invention, through the configuration of the drive nut 12, self-locking nut 13, and limiting member 11, achieves anchor drilling, resin anchoring, prestressing application, and anchoring in one step. The anchor installation process is simple, fast, and highly efficient. There is no complex connection structure between the drilling rig and the anchor; when the working part of the drilling rig retracts, the anchor can be separated from the drilling rig simply by the straight retraction of the working part, without manual intervention. Furthermore, when the prestressing force is applied, the drive nut 12 moves within the mounting cavity 17, while the joint body does not move linearly, thus preventing the drive nut 12 from separating from the joint body.

[0080] Furthermore, the drive nut 12 is located 50mm from the tail end of the second hollow anchor rod body 2. The portion from the tail end of the anchor rod to the drive nut 12 first enters the joint body during alignment for positioning the drive component 14 and the drive nut 12.

[0081] During the alignment process between the joint body and the anchor rod, the tail end of the second hollow anchor rod body 2 enters the joint body first, and at this time, the second hollow anchor rod body 2 that enters the joint body plays a positioning role.

[0082] Because a portion of the length is reserved at the tail of the second hollow anchor rod body 2, when the self-locking nut 13 is assembled with the joint body, the tail of the anchor rod first enters the joint body to form a positioning, thus preventing the anchor rod from falling out of the anchor hole when the self-locking nut 13 and the joint body are aligned; and it can also ensure that the self-locking nut 13 and the joint body can be automatically aligned by the drilling machine without manual intervention.

[0083] Example 3:

[0084] like Figures 1-5As shown, a method for using a self-drilling prestressed hollow anchor bolt with embedded anchoring agent as described in Example 1 or Example 2 includes the following steps:

[0085] S10, Drilling anchor holes: The second hollow anchor body 2 reverses and drives the first hollow anchor body 1 and the drill bit 4 to rotate synchronously, and the drill bit 4 drills in;

[0086] S20, Anchor Bolt Fixing: (1) Adhesive Extrusion: After the drill bit 4 is drilled into place, the drill bit 4 is pressed against the bottom of the anchor hole, and then the second hollow anchor bolt body 2 rotates forward; when the second hollow anchor bolt body 2 rotates forward, it moves forward along the axis of the first hollow anchor bolt body 1 and squeezes the adhesive in the cartridge 3 from the first hollow anchor bolt body 1 through the drill bit 4 into the anchor hole; (2) Adhesive Stirring: When the adhesive in the cartridge 3 is completely squeezed out of the first hollow anchor bolt body 1 into the anchor hole, the second hollow anchor bolt body 2 continues to rotate and drives the first hollow anchor bolt body 1 to rotate synchronously to stir the adhesive; wait for t1 time until the adhesive solidifies;

[0087] S30, Prestressing application: The adhesive restricts the rotational movement of the first hollow anchor body 1 and the second hollow anchor body 2, and drives the nut 12 to continue rotating to break through the restriction of the limiting member 11. Then the nut 12 moves towards the pad plate and moves to tighten the pad plate, thus completing the application of prestress.

[0088] S40, Drive component 14 retracts in a straight line, anchoring completed: After the prestress is applied, drive component 14 retracts in a straight line until it disengages from drive nut 12, completing the anchoring.

[0089] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A self-drilling prestressed hollow anchor rod with an embedded anchoring agent, characterized in that: The first hollow anchor rod body and the second hollow anchor rod body; The first hollow anchor rod body is provided with a cartridge, and the end of the first hollow anchor rod body is provided with a drill bit; The second hollow anchor rod body is in transmission connection with the first hollow anchor rod body, and when the second hollow anchor rod body is reversed, the first hollow anchor rod body is synchronously reversed and drilled; when drilling is completed, the second hollow anchor rod body is rotated in the positive direction, the cartridge in the first hollow anchor rod body is extruded, and the first anchor rod is rotated in the same direction to stir the resin One end of the second hollow anchor rod body extends into the first hollow anchor rod body away from the drill bit and is in threaded connection with the first hollow anchor rod body; The end of the second hollow anchor rod body extending into the first hollow anchor rod body is provided with a retreat stop portion, and the retreat stop portion is used to prevent the second hollow anchor rod body from being withdrawn from the first hollow anchor rod body when the second hollow anchor rod body is reversed.

2. The self-drilling prestressed hollow anchor rod with a built-in anchoring agent according to claim 1, characterized in that: The first hollow anchor rod body is respectively provided with a threaded hole and a straight hole in communication, the threaded hole is arranged at the end of the first hollow anchor rod body away from the drill bit, and the cartridge is arranged in the straight hole; The retreat stop portion is a ring structure, the outer diameter of the retreat stop portion is smaller than the diameter of the straight hole and larger than the diameter of the threaded hole.

3. The self-drilling prestressed hollow anchor rod with a built-in anchoring agent according to claim 2, characterized in that: The straight hole is provided with a cylinder, the cartridge is arranged in the cylinder, and a gap for cooling water to pass through is arranged between the cylinder and the straight hole; The end of the cylinder close to the threaded hole is provided with a piston, and the outer diameter of the retreat stop portion is smaller than the inner diameter of the cylinder.

4. The self-drilling prestressed hollow anchor rod with a built-in anchoring agent according to claim 1, characterized in that: The end of the first hollow anchor rod body is provided with a cutter for cutting the cartridge, and the cutter and the first hollow anchor rod body are in split structure.

5. The self-drilling prestressed hollow anchor rod with a built-in anchoring agent according to claim 4, characterized in that: The drill bit is in threaded connection with the end of the first hollow anchor rod body, and the cutter is fixed on the end of the first hollow anchor rod body through the drill bit.

6. The self-drilling prestressed hollow anchor rod with a built-in anchoring agent according to any one of claims 1-5, characterized in that: The end of the second hollow anchor rod body away from the first hollow anchor rod body is sequentially provided with a limiting piece, a driving nut and a self-locking nut in the axial direction; The driving nut is in transmission connection with a driving piece, and the driving piece drives the driving nut to rotate in the positive direction or in the reverse direction; The self-locking nut is used to limit the axial displacement of the driving nut when the driving nut is reversed; When the second hollow anchor rod body is not fixed, the limiting piece limits the axial displacement of the driving nut when the driving nut is rotated in the positive direction, and the driving nut drives the second hollow anchor rod body to synchronously rotate in the positive direction; when the first hollow anchor rod body and the second hollow anchor rod body are fixed by an adhesive, the driving nut breaks through the limitation of the limiting piece, and the driving piece drives the driving nut to move along the second hollow anchor rod body in the axial direction and tightly press against a backing plate to apply a prestress to the anchor rod.

7. The self-drilling prestressed hollow anchor rod with a built-in anchoring agent according to claim 6, characterized in that: The driving nut is arranged at the tail end of the second hollow anchor rod body, and the tail end of the anchor rod to the driving nut part is firstly arranged in the joint body for positioning of the driving piece and the driving nut when alignment is performed.

8. A method of using a self-drilling prestressed hollow anchor rod with a built-in anchoring agent according to any one of claims 1-7, characterized in that: The method comprises the following steps: S10, drilling an anchor hole: the second hollow anchor rod body is reversed and drives the first hollow anchor rod body and the drill bit to synchronously rotate, and the drill bit is drilled; S20, anchor rod fixing: (1) adhesive extrusion: after the drill bit is drilled into position, the drill bit is made to tightly press against the bottom of the anchor hole, and then the second hollow anchor rod body is rotated forward; the second hollow anchor rod body is rotated forward along the first hollow anchor rod body and extrudes the adhesive in the cartridge from the first hollow anchor rod body through the drill bit into the anchor hole; (2) adhesive stirring: when the adhesive in the cartridge is completely extruded out of the first hollow anchor rod body into the anchor hole, the second hollow anchor rod body continues to rotate and synchronously rotates the first hollow anchor rod body to stir the adhesive; wait for t1 for a long time until the adhesive solidifies; S30, prestress application: the adhesive limits the rotational movement of the first hollow anchor rod body and the second hollow anchor rod body, the drive nut continues to rotate to break through the limitation of the limiting piece, and then the drive nut moves towards the direction of the pad, the drive nut moves to tightly press the pad, and the prestress application is completed; S40, drive member linearly retreats, and anchoring is completed: after the prestress application is completed, the drive member linearly retreats to be separated from the drive nut, and the anchoring is completed.

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