Self-bottom-expanding anchor bolt
By using a split sleeve design and diamond-ground hole bottom, combined with an anti-vibration pressure ring and a protective sleeve, the problems of drilling damage and insufficient anchoring force caused by the large diameter of the self-expanding anchor bolt are solved, achieving higher anchoring quality and bending resistance.
Patent Information
- Application Number
- CN202520490536.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-20
AI Technical Summary
Existing self-expanding anchors have large diameters, which causes severe damage to the surrounding concrete during drilling and results in insufficient anchoring force.
It adopts a split sleeve design, including an expanded bottom sleeve and a connecting sleeve. The bottom of the hole is ground with diamond blocks, combined with an anti-vibration pressure ring and a protective sleeve to improve vibration resistance and fatigue resistance. A digital torque tester ensures accurate installation.
It reduces drilling damage to concrete by 20%, improves anchoring quality and load-bearing capacity, enhances bending resistance, prevents casing torsional deformation, ensures standardized installation torque, and improves durability and shear strength.
Smart Images
Figure CN223893541U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of anchor bolt technology, specifically a self-expanding bottom anchor bolt. Background Technology
[0002] Self-expanding anchors utilize a special design principle to create a mechanical anchoring effect within the concrete. They typically consist of a threaded rod, a sleeve, and a nut. The threaded rod connects to the sleeve via a thread, and the nut adjusts the depth and anchoring force. When the nut rotates, the threaded rod stretches, pushing the bottom of the sleeve into the concrete, creating a strong anchoring effect.
[0003] Conventional self-expanding anchors have large diameters, which increases the damage to the surrounding concrete during drilling and reduces the anchoring force. Therefore, a self-expanding anchor is proposed. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] In view of the shortcomings of the prior art, this utility model provides a self-expanding bottom anchor bolt to solve the problems mentioned in the background art.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, this utility model provides the following technical solution: a self-expanding bottom anchor bolt, comprising:
[0008] Anchor bolt and split sleeve, wherein the split sleeve is disposed outside the anchor bolt, and the split sleeve includes an expanded bottom sleeve and a connecting sleeve, and the connecting sleeve and the expanded bottom sleeve are connected by a threaded connection;
[0009] The bottom-expanding cutter head is located at one end outside the bottom-expanding sleeve, and six diamond blocks are installed at the outer end of the bottom-expanding cutter head evenly distributed in a ring.
[0010] Preferably, one end of the connecting sleeve is provided with an anti-vibration pressure ring, and the anti-vibration pressure ring is embedded in the inside of the connecting sleeve. The anti-vibration pressure ring improves the overall vibration resistance and fatigue resistance of the anchor bolt.
[0011] Preferably, a protective sleeve is provided on the outside of the right end of the anchor rod, and the protective sleeve is connected to the anchor rod by a threaded connection. The protective sleeve is used to protect the threaded structure on the outside of the anchor rod.
[0012] Preferably, the outer surface of the sheath is provided with anti-slip ridges, and the anti-slip ridges are integrally formed with the sheath, thereby improving the anti-slip properties of the sheath.
[0013] (III) Beneficial Effects
[0014] Compared with the prior art, this utility model provides a self-expanding anchor bolt, which has the following beneficial effects:
[0015] This invention ensures precise enlargement diameter by embedding diamond grinding at the bottom of the hole; the split sleeve design verifies the accuracy of effective anchoring depth and standard installation torque; a digital torque meter ensures standardized installation torque and recommended tightening torque; the self-expanding anchor bolt of the same specification has a smaller drilling diameter, reducing the damage to surrounding concrete by 20%; the anchoring quality is equivalent to the pre-embedded effect, with higher load-bearing capacity; it has been verified through seismic, fatigue, and impact resistance tests; the self-expanding anchor bolt sleeve adopts a split design, with an enlargement sleeve and a connecting sleeve, reducing the length of the enlargement sleeve to prevent torsional deformation during installation and rotation of the sleeve; the length of the connecting sleeve is adjusted according to different anchoring depths, and when the part of the anchor bolt exposed above the concrete surface increases the shear force, the diameter of the connecting sleeve can be flexibly changed to significantly increase the shear force; the internal thread design of the connecting sleeve ensures that the cone head of the enlargement sleeve and the anchor bolt will not slip or loosen. An anti-vibration pressure ring is embedded in the connecting sleeve to improve the overall vibration resistance and fatigue resistance of the anchor bolt. After the installation torque is applied, the anti-vibration pressure ring expands and seals the surrounding pores to prevent moisture from corroding the enlarged sleeve and anchor rod, thereby improving the overall durability of the anchor bolt. The cutter head of the enlarged sleeve is embedded with diamonds, and the concrete at the bottom of the hole is ground 360 degrees to achieve a more accurate and reliable enlargement diameter. The diameter of the part of the anchor rod embedded in the concrete is larger than the diameter of the exposed anchor rod, which increases the overall bending resistance of the anchor bolt. In summary, the problems mentioned in the background technology are solved. Attached Figure Description
[0016] Figure 1 This is a three-dimensional view of the overall structure of this utility model;
[0017] Figure 2 This is a perspective view of the sleeve in the separated state of this utility model;
[0018] Figure 3 This is a schematic diagram of the expanding cutter head structure of this utility model.
[0019] In the diagram: 1. Anchor bolt; 2. Expanded bottom sleeve; 3. Connecting sleeve; 4. Expanded bottom cutter head; 5. Diamond block; 6. Protective sleeve; 7. Anti-slip ridge; 8. Vibration-resistant pressure ring. 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] This utility model provides a technical solution: a self-expanding bottom anchor bolt. Please refer to [link / reference needed]. Figure 1 , Figure 2 and Figure 3 ,include:
[0022] Anchor bolt 1 and split sleeve, the split sleeve is set outside the anchor bolt 1, the split sleeve includes an expanded bottom sleeve 2 and a connecting sleeve 3, and the connecting sleeve 3 and the expanded bottom sleeve 2 are connected by threaded engagement;
[0023] The bottom-expanding cutter head 4 is located at one end outside the bottom-expanding sleeve 2, and six diamond blocks 5 are installed at one end outside the bottom-expanding cutter head 4, which are evenly distributed in a ring.
[0024] Please see Figure 1 and Figure 2 An anti-vibration pressure ring 8 is provided at one end of the connecting sleeve 3, and the anti-vibration pressure ring 8 is embedded in the inside of the connecting sleeve 3. The anti-vibration pressure ring 8 improves the overall vibration resistance and fatigue resistance of the anchor bolt.
[0025] Please see Figure 1 and Figure 2 An outer sleeve 6 is provided on the right end of the anchor rod 1, and the outer sleeve 6 is connected to the anchor rod 1 by thread engagement. The outer sleeve 6 is used to protect the threaded structure on the outside of the anchor rod 1.
[0026] Please see Figure 1 and Figure 2 The outer side of the sheath 6 is provided with anti-slip ridges 7, and the anti-slip ridges 7 are integrally formed with the sheath 6. The anti-slip ridges 7 improve the anti-slip properties of the sheath 6.
[0027] This solution involves connecting the connecting sleeve 3 to the enlarged bottom sleeve 2 and the anchor rod 1 via a threaded connection. One end of the anchor rod 1 is inserted into the hole, and then the sleeve is rotated so that the enlarged bottom cutter head 4 grinds the concrete at the bottom of the hole through the diamond block 5. Finally, the torque is used to tighten the nut.
[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A self-expanding anchor bolt, characterized in that, include: Anchor bolt (1) and split sleeve, the split sleeve is set outside the anchor bolt (1), the split sleeve includes an expanded bottom sleeve (2) and a connecting sleeve (3), and the connecting sleeve (3) and the expanded bottom sleeve (2) are connected by threaded connection; The bottom-expanding cutter head (4) is located at one end outside the bottom-expanding sleeve (2), and six diamond blocks (5) are evenly distributed in a ring at one end outside the bottom-expanding cutter head (4).
2. The self-expanding anchor bolt according to claim 1, characterized in that: An anti-vibration pressure ring (8) is provided at one end of the connecting sleeve (3), and the anti-vibration pressure ring (8) is embedded in the inside of the connecting sleeve (3).
3. The self-expanding anchor bolt according to claim 1, characterized in that: The right end of the anchor rod (1) is provided with a protective sleeve (6), and the protective sleeve (6) is connected to the anchor rod (1) by a threaded connection.
4. A self-expanding anchor bolt according to claim 3, characterized in that: The outer side of the sheath (6) is provided with anti-slip ribs (7), and the anti-slip ribs (7) are integrally formed with the sheath (6).