Double-expansion anchor rod
By designing a double-expansion anchor with opposite expansion at both ends of the expansion cylinder and the cooperation of elastic locking components, the problem of insufficient stability of existing anchors is solved, and a stable connection between the anchor and the inner wall of the borehole is achieved, preventing loosening and outward displacement.
Patent Information
- Application Number
- CN202520465901.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-17
AI Technical Summary
Most existing self-expanding anchors are single-expanding structures, which results in limited stability of the connection between the anchor and the borehole wall, and double-expanding anchors are prone to loosening and outward movement.
A double-expansion anchor bolt was designed, with the two ends of the expansion cylinder opened by a right countersunk block and a left countersunk block respectively, and the expansion directions were opposite. The movement of the set nut was restricted by an elastic locking component to ensure a stable connection between the anchor bolt and the inner wall of the borehole.
This improved the stability of the connection between the anchor bolt and the borehole wall, preventing the anchor bolt from loosening and shifting outward, and enhancing the stability of the anchoring.
Smart Images
Figure CN223868031U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of expansion anchor technology, and in particular to an anchor that can double expand. Background Technology
[0002] Self-expanding anchors are inserted into the borehole, and after they expand and become fixed, grouting is performed for consolidation. Most existing self-expanding anchors are single-expansion structures, which limits the stability of the connection between the anchor and the borehole wall. Even with double-expansion anchors, their double-expansion structure is mostly unidirectional expansion at different locations, resulting in limited stability and a tendency for the anchor to loosen or shift outward. Utility Model Content
[0003] This invention proposes an anchor bolt that can expand in two directions, thereby improving the stability of the anchor bolt's connection with the borehole wall.
[0004] The technical solution of this utility model is implemented as follows: A double-expandable anchor rod includes an expansion cylinder, a threaded rod, and an anchor rod body. A guide cylinder and a set nut are fixed to the left end of the anchor rod body in sequence. Slots are provided at both ends of the expansion cylinder. The right end of the threaded rod passes through the set nut and is placed inside the guide cylinder. A sliding right countersunk block is fitted on the threaded rod to the left of the set nut. The left end of the threaded rod passes through the expansion cylinder and is fixed with a left countersunk block. The right countersunk block and the left countersunk block are conical blocks arranged facing each other.
[0005] Furthermore, an elastic locking element is provided on the threaded rod on the left side of the countersunk block. After the set nut moves to the left, the elastic locking element is used to restrict the set nut from moving to the right.
[0006] Furthermore, a radial threaded hole is provided on the threaded rod on the left side of the right countersunk block. The elastic locking component includes a threaded cylinder, which is threadedly fixed in the radial threaded hole. Both the upper and lower ends of the threaded cylinder are provided with radially sliding locking blocks. A compression spring is provided between the two locking blocks. The side of the locking block closest to the right countersunk block is an inclined surface, and the other side is a vertical surface.
[0007] Furthermore, a support spring is fitted onto the threaded rod between the right countersunk block and the left countersunk block. The support spring acts as a buffer.
[0008] Furthermore, a first guide block is fixed to the threaded rod inside the expansion cylinder, and the first guide block slides along the inner wall of the expansion cylinder. The first guide block ensures that the expansion cylinder and the threaded rod are aligned on the same axis.
[0009] Furthermore, a second guide block is fixed to the threaded rod inside the guide cylinder, and the second guide block slides along the inner wall of the guide cylinder. The setting of the second guide block ensures that the guide cylinder and the threaded rod are aligned on the same axis.
[0010] Furthermore, a fixing block is fixed to the left end of the countersunk block, and the left end of the fixing block is arc-shaped. The arc-shaped end facilitates the insertion of the fixing block into the bottom of the drill hole.
[0011] The beneficial effects of this utility model are:
[0012] This invention achieves double expansion by rotating the anchor rod body. The right countersunk block opens the right end of the expansion cylinder, and the left countersunk block opens the left end of the expansion cylinder. The opening and expansion directions are opposite, which helps to improve the stability of the anchor rod and the inner wall of the borehole. The operation is simple and convenient.
[0013] The elastic locking component of this invention limits the reverse movement of the set nut after the set nut pushes the expansion cylinder and the right countersunk block to the left. This helps to further improve the stability of the anchor bolt and prevent the anchor bolt from loosening or shifting outward. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the internal structure of the anchor bolt in Example 1;
[0017] Figure 3 This is a schematic diagram of the internal structure of the anchor bolt in Example 2;
[0018] Figure 4 This is a schematic diagram of the elastic locking component.
[0019] 1. Expansion cylinder, 2. Threaded rod, 3. Anchor body, 4. Guide cylinder, 5. Set nut, 6. Slotted slot, 7. Second guide block, 8. Right countersunk block, 9. Left countersunk block, 10. Support spring, 11. First guide block, 12. Fixing block, 13. Elastic locking element, 14. Radial screw hole, 15. Threaded cylinder, 16. Locking block, 17. Compression spring. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Example 1
[0022] like Figure 1-2 As shown, a double-expansion anchor bolt includes an expansion cylinder 1, a threaded rod 2, and an anchor bolt body 3. A guide cylinder 4 and a set nut 5 are fixed to the left end of the anchor bolt body 3 in sequence. Both the left and right ends of the expansion cylinder 1 are provided with slotted slits 6. The right end of the threaded rod 2 is threaded through the set nut 5 and placed inside the guide cylinder 4. A second guide block 7 is fixed on the threaded rod 2 inside the guide cylinder 4. The second guide block 7 slides along the inner wall of the guide cylinder 4.
[0023] A sliding right countersunk block 8 is fitted on the threaded rod 2 on the left side of the set nut 5. The left end of the threaded rod 2 passes through the expansion cylinder 1 and is fixed with a left countersunk block 9. The right countersunk block 8 and the left countersunk block 9 are conical blocks arranged facing each other. The left countersunk block 9 opens the left end of the expansion cylinder 1, and the right countersunk block 8 opens the right end of the expansion cylinder 1.
[0024] A support spring 10 is fitted onto the threaded rod 2 between the right countersunk block 8 and the left countersunk block 9. A first guide block 11 is fixed to the threaded rod 2 inside the expansion cylinder 1, and the first guide block 11 slides along the inner wall of the expansion cylinder 1. The threaded rod 2, the expansion cylinder 1, the guide cylinder 4, and the anchor body 3 are arranged coaxially.
[0025] A fixing block 12 is fixed to the left end of the countersunk block 9. The left end of the fixing block 12 is an arc-shaped end, which matches the bottom of the drill hole.
[0026] The method of using the anchor rod is as follows: Insert the fixing block 12 into the bottom of the drill hole, and then rotate the anchor rod body 3. The anchor rod body 3 drives the guide cylinder 4 and the set nut 5 to rotate. The set nut 5 moves to the left along the threaded rod 2 and pushes the right countersunk block 8 and the expansion cylinder 1 to the left. The left countersunk block 9 causes the left end of the expansion cylinder 1 to open and push against the drill hole wall, and the right countersunk block 8 causes the right end of the expansion cylinder 1 to open and push against the drill hole wall. The support spring 10 is compressed to play a buffering role.
[0027] Example 2
[0028] This embodiment is basically the same as Embodiment 1, except that, as Figure 3 and 4As shown, an elastic locking element 13 is provided on the threaded rod 2 on the left side of the right countersunk block 8. After the set nut 5 moves to the left, the elastic locking element 13 is used to restrict the set nut 5 from moving to the right. A radial threaded hole 14 is provided on the threaded rod 2 on the left side of the right countersunk block 8. The elastic locking element 13 includes a threaded cylinder 15, which is threadedly fixed in the radial threaded hole 14. Both the upper and lower ends of the threaded cylinder 15 are provided with radially sliding locking blocks 16. A compression spring 17 is provided in the threaded cylinder 15 between the two locking blocks 16. The side of the locking block 16 closest to the right countersunk block 8 is an inclined surface, and the other side is a vertical surface.
[0029] When the set nut 5 pushes the right countersunk block 8 to the left, it pushes the locking block 16 to retract into the threaded cylinder 15 through the inclined surface. The compression spring 17 is compressed. After the set nut 5 passes the locking block 16, the compression spring 17 extends and pushes the locking block 16 out of the threaded cylinder 15. The vertical surface of the locking block 16 faces the set nut 5, restricting the set nut 5 from moving to the right.
[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A double-expandable anchor bolt, comprising an expansion cylinder, a threaded rod, and an anchor bolt body, characterized in that: The left end of the anchor bolt body is fixed with a guide cylinder and a set nut in sequence. Both ends of the expansion cylinder are provided with slotted slits. The right end of the threaded rod passes through the set nut and is placed inside the guide cylinder. A sliding right countersunk block is fitted on the threaded rod on the left side of the set nut. The left end of the threaded rod passes through the expansion cylinder and is fixed with a left countersunk block. The right countersunk block and the left countersunk block are conical blocks arranged facing each other.
2. The double-expansion anchor bolt according to claim 1, characterized in that: An elastic locking element is provided on the threaded rod on the left side of the countersunk block. After the set nut moves to the left, the elastic locking element is used to restrict the set nut from moving to the right.
3. The double-expansion anchor bolt according to claim 2, characterized in that: A radial threaded hole is provided on the threaded rod on the left side of the right countersunk block. The elastic locking component includes a threaded cylinder, which is threaded and fixed in the radial threaded hole. Both ends of the threaded cylinder are provided with radially sliding locking blocks. A compression spring is provided between the two locking blocks. The side of the locking block closest to the right countersunk block is an inclined surface, and the other side is a vertical surface.
4. A double-expansion anchor bolt according to any one of claims 1-3, characterized in that: A support spring is fitted on the threaded rod between the right countersunk block and the left countersunk block.
5. The double-expansion anchor bolt according to claim 1, characterized in that: A first guide block is fixed on the threaded rod inside the expansion cylinder, and the first guide block slides along the inner wall of the expansion cylinder.
6. The double-expansion anchor bolt according to claim 1, characterized in that: A second guide block is fixed on the threaded rod inside the guide cylinder, and the second guide block slides along the inner wall of the guide cylinder.
7. The double-expansion anchor bolt according to claim 1, characterized in that: The left end of the countersunk block is fixed with a fixing block, and the left end of the fixing block is arc-shaped.