High-stress soft rock stratum anchor rod supporting device
By using a composite anchoring connection type anchor support device, which combines inner and outer rods and high-toughness adhesive, the problem of insufficient anchoring force in high-stress soft rock strata is solved, thereby improving the anchoring force and enhancing the stability of the rock strata, and ensuring the safety of the project.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUIZHOU ZHENGLI MINING CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-05-12
AI Technical Summary
Existing anchor bolt support devices have insufficient anchoring force in high-stress soft rock strata, which cannot effectively limit rock mass deformation and displacement, and are prone to loosening under high-stress environments, leading to threats to engineering safety.
A composite anchoring connection type anchor support device is adopted. Through the design of inner and outer rods, the mechanical interlocking of the auxiliary rod and the combination of high-toughness adhesive are achieved to form a composite bonding force, absorb rock stress, and enhance anchoring stability.
It improves anchoring force, suppresses initial displacement of rock strata, extends anchor life, reduces maintenance costs, and ensures project safety.
Smart Images
Figure CN224228698U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of anchor bolt support equipment, and in particular to an anchor bolt support device for high-stress soft rock formations. Background Technology
[0002] In underground engineering, such as mining and tunnel excavation, the support of high-stress soft rock strata has always been a critical and challenging issue. High-stress soft rock strata, due to their low strength, high porosity, and poor cementation, are prone to significant plastic deformation under engineering forces, posing a serious threat to engineering safety. Rock bolt support, a commonly used reinforcement method, involves driving bolts into the rock mass and utilizing their interaction with the surrounding rock to maintain rock mass stability, and is widely used in various engineering projects. However, existing rock bolt support devices have revealed many shortcomings for the special conditions of high-stress soft rock strata. Under high-stress environments, the anchoring force of existing rock bolt support devices is often insufficient to withstand the enormous rock mass pressure. Rock bolts often rely on a single anchoring method, such as end-anchored rock bolts, where the anchoring point is only formed at the end of the bolt. In high-stress soft rock strata, this anchoring point is easily loosened due to the fracturing of the surrounding rock mass, leading to a sharp decrease in anchoring force and failing to effectively limit rock mass deformation and displacement. For the reasons mentioned above, this application proposes a composite anchoring connection type anchor bolt support device for high-stress soft rock strata. Summary of the Invention
[0003] The purpose of this invention is to address the problems existing in the background technology by proposing a composite anchoring connection anchor bolt support device for high-stress soft rock strata.
[0004] The technical solution of this utility model is: a high-stress soft rock layer anchor bolt support device, including an outer fixing component and an inner fixing component, wherein the inner fixing component is sleeved inside the outer fixing component;
[0005] The external fixing component includes an outer sleeve rod, the bottom of which is rotatably connected to multiple auxiliary support rods, and the top of which is fixedly connected to a rotating disk;
[0006] The inner fixing component includes an inner rod that is threadedly rotatably connected to the inner wall of the outer rod. A fixing ring is fixedly sleeved on the outer ring of the bottom end of the inner rod. Multiple fixing blocks are arrayed below the fixing ring along its outer ring, and a fixing rod is provided between two adjacent fixing blocks.
[0007] An anchoring plate is fitted around the top outer ring of the outer sleeve rod.
[0008] Optionally, the outer ring of the outer sleeve rod is provided with multiple annular ribs, and the outer ring of the outer sleeve rod is also provided with stress relief grooves.
[0009] Optionally, the auxiliary support rod has a guide opening along its length, and each set of fixed rods has one guide opening.
[0010] Optionally, the cross-section of the retaining ring is a right-angled trapezoidal structure, and the outer diameter of the bottom ring of the retaining ring is larger than the outer diameter of its top ring.
[0011] Optionally, the top of the outer rod is connected to the rotating disk via a fixed connecting frame, and the inner rod has an inner grouting cavity, the bottom of which is connected to a plurality of diversion channels penetrating the bottom end of the inner rod.
[0012] Optionally, the rotating disk has a grouting port corresponding to the grouting cavity, the connecting frame has a first connecting hole, and the inner rod has multiple limiting holes along its height direction. Bolts are rotatably installed in the limiting holes and the first connecting hole respectively.
[0013] Optionally, the outer ring of the upper half of the inner rod is also provided with a threaded groove that matches the inner wall of the outer rod.
[0014] Optionally, the anchoring connection plate includes mounting holes and a plurality of second connection holes.
[0015] Compared with the prior art, the present invention has the following beneficial technical effects:
[0016] This utility model achieves the strength of the anchor rod by setting inner and outer rods. The auxiliary support rod set at the end that contacts the rock expands outward while the inner rod rotates and pushes, thereby expanding the end of the anchor rod. The auxiliary support rod and the inner rod are pushed to form an angle of 60°, forming a mechanical engagement with the hole wall, suppressing the initial displacement of the rock layer, and ensuring the anchoring stability of the rock.
[0017] Furthermore, stress relief grooves are machined on the surface of the external fasteners. When local stress is concentrated in the rock strata, the grooves undergo plastic deformation to absorb energy, thus preventing stress from being transmitted to the anchoring section and causing damage to the bonding layer.
[0018] Furthermore, annular ribs are machined on the surface of the outer sleeve rod, and high-toughness epoxy resin adhesive is injected between two adjacent annular ribs. The ribs and adhesive form a composite effect of mechanical bond and chemical bonding, which improves the adhesion.
[0019] In summary, this invention improves anchoring force. The mechanical interlocking of the inverted wedge provides initial anchoring force, quickly suppressing rock displacement. The convex ribs of the rod, combined with a high-toughness adhesive, form a composite bonding force. The spiral groove of the rod can plastically deform when the rock stress is concentrated, absorbing energy, preventing the bonding layer from being damaged, and extending the life of the anchor. From improving anchoring force to releasing stress, it comprehensively enhances the stability of the anchor, adapts to high-stress soft rock layers, ensures engineering safety, and reduces maintenance costs. Attached Figure Description
[0020] Figure 1 A three-dimensional structural schematic diagram of this utility model is provided;
[0021] Figure 2 This is an exploded structural diagram of the present invention;
[0022] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure;
[0023] Figure 4 for Figure 3 Schematic diagram of the structure at point A in the middle.
[0024] Figure label:
[0025] 1. External fastener; 11. Outer sleeve rod; 12. Stress relief groove; 13. Annular rib; 14. Connecting frame; 15. Rotating disk; 150. Grouting port; 16. First connecting hole; 17. Auxiliary support rod; 170. Guide port;
[0026] 2. Internal fixing component; 21. Inner rod; 210. Grouting cavity; 211. Diversion channel; 22. Threaded groove; 23. Limiting hole; 24. Bolt; 25. Fixing ring; 26. Fixing block; 27. Fixing rod;
[0027] 3. Anchoring connection plate; 31. Mounting hole; 32. Second connection hole. Detailed Implementation
[0028] The technical solutions of this disclosure will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments.
[0029] The components of the embodiments of this disclosure, which are typically described and shown in the accompanying drawings, can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of embodiments of this disclosure provided in the drawings is not intended to limit the scope of the claimed disclosure, but merely to illustrate selected embodiments of the disclosure.
[0030] Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.
[0031] In the description of this disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0032] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.
[0033] Example
[0034] like Figures 1-4 As shown, the present invention proposes a high-stress soft rock stratum anchor support device, which includes an outer fixing member 1 and an inner fixing member 2, wherein the inner fixing member 2 is sleeved inside the outer fixing member 1;
[0035] like Figure 2 As shown, the outer fixing component 1 includes an outer sleeve rod 11. The outer ring of the outer sleeve rod 11 is provided with multiple annular ribs 13. A high-toughness epoxy resin adhesive with a compressive strength ≥60MPa and a shear strength ≥25MPa is injected between two adjacent annular ribs 13. The outer ring of the outer sleeve rod 11 is also provided with a stress relief groove 12. Through the setting of the stress relief groove 12, when the local stress of the rock layer is concentrated, the groove undergoes plastic deformation to absorb energy, avoiding stress transmission to the anchoring section and causing damage to the bonding layer. Multiple auxiliary support rods 17 are rotatably connected to the bottom of the outer sleeve rod 11. The auxiliary support rods 17 are provided with guide openings 170 along their length direction. Each group of fixing rods 27 is provided with one guide opening 170. The setting of the fixing rods 27 is used to limit the position of the auxiliary support rods 17 when they are not expanded. A rotating disk 15 is also fixedly connected to the top of the outer sleeve rod 11.
[0036] like Figure 2As shown, the inner fixing member 2 includes an inner rod 21 that is threadedly rotatably connected to the inner wall of the outer rod 11. The upper half of the outer ring of the inner rod 21 is also provided with a threaded groove 22 that is adapted to the inner wall of the outer rod 11. The threaded groove 22 is used to rotate and push the inner fixing member 2 downward along the inner wall of the outer fixing member 1. A fixing ring 25 is fixedly sleeved on the outer ring of the bottom end of the inner rod 21. The cross section of the fixing ring 25 is a right trapezoidal structure, and the outer diameter of the bottom ring of the fixing ring 25 is larger than the outer diameter of its top ring. The fixing ring 25 is used to guide the push when the auxiliary support rod 17 is pushed downward, so that the auxiliary support rod 17 is pushed in a bottom-open state, thereby increasing the contact area with the rock. Multiple fixing blocks 26 are arrayed below the fixing ring 25 along its outer ring, and a fixing rod 27 is provided between two adjacent fixing blocks 26.
[0037] like Figure 1 and Figure 4 As shown, the top of the outer rod 11 is connected to the rotating disk 15 through the fixed connecting frame 14. The inner rod 21 has an inner grouting cavity 210. The bottom of the grouting cavity 210 is connected to a plurality of diversion channels 211 that penetrate the bottom end of the inner rod 21. Grouting reinforcement operation is achieved through the setting of the grouting port 150, the grouting cavity 210 and the diversion channels 211.
[0038] like Figure 1 and Figure 4 As shown, the rotating disk 15 has a grouting port 150 corresponding to the grouting cavity 210, the connecting frame 14 has a first connecting hole 16, and the inner rod 21 has a plurality of limiting holes 23 along its height direction. The limiting holes 23 and the first connecting hole 16 are rotatably installed with bolts 24.
[0039] like Figure 1 and Figure 2 As shown, the top outer ring of the outer sleeve rod 11 is fitted with an anchoring connecting plate 3, which includes an installation hole 31 and multiple second connecting holes 32.
[0040] In this embodiment, a drilling rig is used to drill anchor bolt holes that meet the design requirements in high-stress, weak rock formations. The hole diameter is slightly larger than the outer diameter of the outer sleeve rod 11 to ensure that the anchor bolt support device can be installed smoothly. The assembled outer fixing component 1 and inner fixing component 2 are slowly placed into the anchor bolt hole so that the outer sleeve rod 11 fits against the hole wall. By rotating the rotating disk 15, the inner fixing component 2 moves downward inside the outer fixing component 1 using threaded transmission. As the inner rod 21 moves downward, the fixing ring 25 pushes the fixing block 26 and fixing rod 27 to expand outward. The auxiliary support rod 17 is pushed while rotating along its top under the guidance of the guide port 170 and the fixing rod 27, causing the auxiliary support rod 17 to open outward, squeezing the hole wall and forming the initial anchor.
[0041] Meanwhile, by rotating the bolt 24 within the first connecting hole 16 and the limiting hole 23, the expanded auxiliary support rod 17, as well as the outer fixing part 1 and the inner fixing part 2, are more firmly assembled by the bolt 24, ensuring that the anchor rod and the rock layer are stable under stress.
[0042] The grouting equipment is connected through the mounting hole 31. High-strength grouting material is injected into the grouting cavity 210, the diversion channel 211 and the gap of the anchor bolt hole. The grouting material fills the gap between the inner fixing part 2 and the outer fixing part 1 through the diversion channel 211 and penetrates into the rock stratum fissures. After the material solidifies, it further enhances the connection strength between the anchor bolt and the rock stratum, forming a secondary reinforcement.
[0043] The above specific embodiments are merely optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.
Claims
1. A high-stress soft rock stratum anchor support device, characterized in that: It includes an external fixator (1) and an internal fixator (2), wherein the internal fixator (2) is fitted inside the external fixator (1); The external fixing member (1) includes an outer sleeve rod (11), the bottom of which is rotatably connected to a plurality of auxiliary support rods (17), and the top of which is fixedly connected to a rotating disk (15). The inner fixing member (2) includes an inner rod (21) that is threadedly rotatably connected to the inner wall of the outer rod (11). A fixing ring (25) is fixedly sleeved on the outer ring of the bottom end of the inner rod (21). Multiple fixing blocks (26) are arrayed below the fixing ring (25) along its outer ring. A fixing rod (27) is provided between two adjacent fixing blocks (26). The outermost ring of the outer sleeve rod (11) is fitted with an anchoring connecting plate (3).
2. The anchor bolt support device for high-stress weak rock formations according to claim 1, characterized in that, The outer ring of the outer sleeve rod (11) is provided with multiple annular ribs (13), and the outer ring of the outer sleeve rod (11) is also provided with stress relief grooves (12).
3. The anchor bolt support device for high-stress weak rock formations according to claim 1, characterized in that, The auxiliary support rod (17) has a guide opening (170) along its length direction, and each set of fixed rods (27) is provided with a guide opening (170).
4. The anchor bolt support device for high-stress weak rock formations according to claim 1, characterized in that, The cross-section of the fixing ring (25) is a right trapezoidal structure, and the outer diameter of the bottom ring of the fixing ring (25) is larger than the outer diameter of its top ring.
5. The anchor bolt support device for high-stress weak rock formations according to claim 1, characterized in that, The top of the outer rod (11) is connected to the rotating disk (15) via a fixed connecting frame (14). The inner rod (21) has an inner grouting cavity (210). The bottom of the grouting cavity (210) is connected to a plurality of diversion channels (211) that penetrate the bottom end of the inner rod (21).
6. A high-stress soft rock stratum anchor support device according to claim 5, characterized in that, The rotating disk (15) has a grouting port (150) corresponding to the grouting cavity (210), the connecting frame (14) has a first connecting hole (16), the inner rod (21) has a plurality of limiting holes (23) along its height direction, and the limiting holes (23) and the first connecting holes (16) are rotatably installed with bolts (24).
7. The anchor bolt support device for high-stress weak rock formations according to claim 1, characterized in that, The upper half of the outer ring of the inner rod (21) is also provided with a threaded groove (22) that is adapted to the inner wall of the outer rod (11).
8. The anchor bolt support device for high-stress weak rock formations according to claim 1, characterized in that, The anchoring connection plate (3) includes mounting holes (31) and multiple second connection holes (32).