A continuous lengthening type coal mine roadway side reinforcement anchor rod
Patent Information
- Application Number
- CN202522767103.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-12-26
AI Technical Summary
[0003]现有技术中，通常采用一根带内螺纹的套管连接两根端头带外螺纹的锚杆，以实现锚杆的加长，然而，螺纹连接方式在受到振动、冲击和长期荷载作用时容易松动，导致连接失效，影响支护效果，甚至可能引发安全事故
[0011]本实用新型所具有的有益效果为：（1）本实用新型通过在连接套内设置弹性橡胶块，在拧紧时第一螺纹段对弹性橡胶块进行挤压变形，从而能够增大第一螺纹段与连接套之间的摩擦力，可减少第一螺纹段与连接套之间松动的情况，并通过在第一螺纹段和内螺纹表面涂覆锌基防腐涂层，增强耐腐蚀性，从而能够提高第一螺纹段与连接套之间连接的稳定性，保证锚杆支护效果；（2）通过加长杆和连接套的模块化设计，可根据煤帮破坏深度连续加长锚杆，提锚杆灵活性和适应性；（3）通过设置密封圈能够减少水汽和腐蚀性介质进入连接套内，减少水汽和腐蚀性介质进入螺纹连接内部，从而能够减少内螺纹和第一螺纹段腐蚀生锈的情况，延长锚杆使用寿命。
Smart Images
Figure CN224919295U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal mine roadway sidewall reinforcement technology, specifically to a continuously extendable coal mine roadway sidewall reinforcement anchor. Background Technology
[0002] In coal mine roadway sidewall reinforcement projects, rock bolt support is the most widely used and most frequently employed support method. Due to the complexity and diversity of geological conditions in coal mine roadways, roadway sidewalls often require rock bolts of different lengths to adapt to different depths of damage.
[0003] In existing technologies, a sleeve with internal threads is typically used to connect two anchor bolts with external threads at both ends to extend the anchor bolt length. However, threaded connections are prone to loosening under vibration, impact, and long-term loads, leading to connection failure, affecting the support effect, and potentially causing safety accidents. Secondly, coal mine roadways are humid environments containing corrosive media, making the threaded parts susceptible to rust and corrosion, affecting the service life of the anchor bolts. Therefore, existing technologies still have shortcomings and deficiencies. Utility Model Content
[0004] This invention provides a continuously extendable coal mine roadway sidewall reinforcement anchor bolt to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a continuously extendable coal mine roadway side reinforcement anchor bolt, including an anchoring section, at least one extension rod, a tail rod, and a connecting sleeve; the anchoring section is made of left-hand threaded steel without longitudinal reinforcement, and the tail of the anchoring section, both ends of the extension rod, and the head of the tail rod are provided with a first threaded section, and the tail of the tail rod is provided with a second threaded section. The surfaces of the first threaded section and the second threaded section are coated with a zinc-based anti-corrosion coating; both ends of the inner wall of the connecting sleeve are provided with internal threads adapted to the first threaded section, and the surface of the internal threads is coated with a zinc-based anti-corrosion coating; a limiting ring is fixedly connected in the middle of the inner wall of the connecting sleeve, and annular grooves are provided on both sides of the limiting ring on the inner wall of the connecting sleeve. Multiple elastic rubber blocks are fixedly connected on the inner side wall of the annular grooves, and the elastic rubber blocks are hemispherical.
[0006] Preferably, sealing rings are installed at both ends of the connecting sleeve.
[0007] Preferably, the surface of the anchoring section is subjected to high-frequency quenching to form a hardened layer.
[0008] Preferably, a tray is fitted onto the second threaded section, and a nut located outside the tray is threaded onto the second threaded end.
[0009] Preferably, the surface of the connecting sleeve is fixedly connected with multiple horizontal ribs at equal intervals.
[0010] Preferably, the extension rod is made of threaded steel without longitudinal reinforcement, and the length of the extension rod is 1m.
[0011] The beneficial effects of this utility model are as follows: (1) By setting an elastic rubber block inside the connecting sleeve, the first threaded section squeezes and deforms the elastic rubber block when tightening, thereby increasing the friction between the first threaded section and the connecting sleeve, reducing the loosening between the first threaded section and the connecting sleeve, and by coating the surface of the first threaded section and the inner thread with a zinc-based anti-corrosion coating, the corrosion resistance is enhanced, thereby improving the stability of the connection between the first threaded section and the connecting sleeve and ensuring the anchor bolt support effect; (2) Through the modular design of the extended rod and the connecting sleeve, the anchor bolt can be continuously extended according to the depth of coal seam damage, improving the flexibility and adaptability of the anchor bolt; (3) By setting a sealing ring, the water vapor and corrosive media can be reduced from entering the connecting sleeve, and the water vapor and corrosive media can be reduced from entering the threaded connection, thereby reducing the corrosion and rust of the inner thread and the first threaded section, and extending the service life of the anchor bolt. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 for Figure 2 A magnified structural diagram of part A in the middle; Figure 4 This is a schematic diagram of the connecting sleeve of this utility model; Figure 5 This is a schematic diagram of the anchoring section of this utility model; Figure 6 This is a schematic diagram of the structure of the extension rod of this utility model; Figure 7 This is a schematic diagram of the tail rod structure of this utility model.
[0013] Reference numerals: 1. Anchoring section, 2. Extension rod, 3. Tail rod, 4. Connecting sleeve, 5. First threaded section, 6. Second threaded section, 7. Internal thread, 8. Limiting ring, 9. Annular groove, 10. Elastic rubber block, 11. Sealing ring, 12. Tray, 13. Nut, 14. Horizontal rib. Detailed Implementation
[0014] The present invention will now be further described with reference to the accompanying drawings.
[0015] like Figure 1-7As shown, this utility model provides a continuously extendable coal mine roadway side reinforcement anchor bolt, including an anchoring section 1, at least one extension rod 2, a tail rod 3, and a connecting sleeve 4; the anchoring section 1 is made of left-hand threaded steel without longitudinal ribs, the extension rod 2 is made of threaded steel without longitudinal ribs, the length of the extension rod 2 is 1m, the tail of the anchoring section 1, both ends of the extension rod 2, and the head of the tail rod 3 are provided with a first threaded section 5, the tail of the tail rod 3 is provided with a second threaded section 6, the surfaces of the first threaded section 5 and the second threaded section 6 are coated with a zinc-based anti-corrosion coating; both ends of the inner wall of the connecting sleeve 4 are provided with internal threads 7 that are adapted to the first threaded section 5, the surface of the internal threads 7 is coated with a zinc-based anti-corrosion coating, a limiting ring 8 is fixedly connected in the middle of the inner wall of the connecting sleeve 4, and annular grooves 9 are provided on both sides of the limiting ring 8 on the inner wall of the connecting sleeve 4, and multiple elastic rubber blocks 10 distributed equidistantly along the circumference are fixedly connected on the inner side wall of the annular groove 9, the elastic rubber blocks 10 are hemispherical.
[0016] Specifically, in use, firstly, according to design requirements, boreholes are drilled in the tunnel sidewalls. The boreholes are then cleaned with compressed air or water to remove rock powder and debris, ensuring full contact between the anchoring agent and the rock mass. A cartridge-type anchoring agent is then inserted into the borehole. The anchoring agent is typically a resin-based agent and should be evenly distributed. Next, the number of extension rods 2 is determined based on the drilling depth. One end of the connecting sleeve 4 is screwed into the first threaded section 5 of the anchoring section 1 until the first threaded section 5 contacts the limiting ring 8. During tightening, the outer wall of the first threaded section 5 compresses and deforms the elastic rubber block 10, increasing the friction between the first threaded section 5 and the connecting sleeve 4, thereby reducing the friction between the first threaded section 5 and the connecting sleeve 4. To address any looseness between threaded section 5 and connecting sleeve 4, improve stability. Then, connect the first threaded section 5 at one end of the extension rod 2 to the connecting sleeve 4. Repeat this step to add extension rod 2 and connecting sleeve 4 until the required length is reached. Connect the first threaded section 5 of the tail rod 3 to the connecting sleeve 4 to assemble an anchor rod of suitable length. Finally, insert the anchor rod into the drilled hole, place the tray 12 on the second threaded section 6 of the tail rod 3, and tighten the nut 13 with a torque wrench to achieve the designed preload. This completes the installation of the anchor rod. In addition, the surfaces of the internal thread 7, the first threaded section 5, and the second threaded section 6 are coated with a zinc-based anti-corrosion coating, which enhances corrosion resistance and extends service life.
[0017] In some embodiments, the outer diameter of the first threaded section 5 is smaller than the outer diameters of the anchoring section 1, the extension rod 2, and the tail rod 3, and sealing rings 11 are installed at both ends of the connecting sleeve 4. Specifically, when the first threaded section 5 is tightened, the ends of the connecting sleeve 4 compress the sealing rings 11 at the ends of the anchoring section 1, the extension rod 2, and the tail rod 3, respectively, to form a seal. By setting the sealing rings 11, moisture can be reduced from entering the connecting sleeve 4, and moisture and corrosive media can be reduced from entering the threaded connection, thereby reducing corrosion and rust on the internal thread 7 and the first threaded section 5, and extending the service life.
[0018] In some embodiments, the surface of the anchoring section 1 is subjected to high-frequency quenching to form a hardened layer, which can improve the wear resistance and impact resistance of the anchoring section 1, making it suitable for the harsh environment of coal mine roadways.
[0019] In some embodiments, a tray 12 is fitted onto the second threaded section 6, and a nut 13 located outside the tray 12 is threaded onto the second threaded end. Specifically, the tray 12 is used to distribute the support force of the anchor bolt to the roadway surface to prevent local stress concentration. When the nut 13 is tightened, the tray 12 is in close contact with the roadway surface, providing preload and keeping the anchor bolt under tension, effectively restraining rock deformation.
[0020] In some embodiments, multiple transverse ribs 14 are fixedly connected at equal intervals to the surface of the connecting sleeve 4. The transverse ribs 14 can enhance the mechanical interlocking force between the connecting sleeve 4 and the anchoring agent. After the anchoring agent cures, the transverse ribs 14 provide additional anchoring force to prevent the connecting sleeve 4 from slipping, thereby improving the overall anchoring force of the anchor rod.
[0021] The above embodiments can be combined with each other.
[0022] The above embodiments are not intended to limit the shape, material, structure, etc. of this utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.
Claims
1. A continuously extendable coal mine roadway sidewall reinforcement anchor bolt, characterized in that: It includes an anchoring section, at least one extension rod, a tail rod, and a connecting sleeve; the anchoring section is made of left-hand threaded steel without longitudinal reinforcement, and the tail of the anchoring section, both ends of the extension rod, and the head of the tail rod are provided with a first threaded section, and the tail of the tail rod is provided with a second threaded section. The surfaces of the first threaded section and the second threaded section are coated with a zinc-based anti-corrosion coating. Both ends of the inner wall of the connecting sleeve are provided with internal threads that are compatible with the first thread section. The surface of the internal threads is coated with a zinc-based anti-corrosion coating. A limit ring is fixedly connected in the middle of the inner wall of the connecting sleeve. Annular grooves are provided on both sides of the limit ring on the inner wall of the connecting sleeve. Multiple elastic rubber blocks are fixedly connected on the inner sidewall of the annular grooves and are equidistantly distributed along the circumference. The elastic rubber blocks are hemispherical.
2. The continuously extendable coal mine roadway side reinforcement anchor bolt according to claim 1, characterized in that: Both ends of the connecting sleeve are equipped with sealing rings.
3. The continuously extendable coal mine roadway side reinforcement anchor bolt according to claim 1, characterized in that: The surface of the anchoring section is hardened by high-frequency quenching.
4. The continuously extendable coal mine roadway side reinforcement anchor bolt according to claim 1, characterized in that: A tray is fitted onto the second threaded section, and a nut located outside the tray is threaded onto the second threaded end.
5. The continuously extendable coal mine roadway side reinforcement anchor bolt according to claim 1, characterized in that: The surface of the connecting sleeve is fixedly connected with multiple horizontal ribs at equal intervals.
6. The continuously extendable coal mine roadway side reinforcement anchor bolt according to claim 1, characterized in that: The extension rod is made of threaded steel without longitudinal reinforcement, and the length of the extension rod is 1m.