Anchoring device capable of monitoring stress and grouting quality
By incorporating sensor circuits and grouting channels into the anchor bolts, combined with stress and grouting monitoring components and a mechanical locking structure, the problems of real-time monitoring and anchoring reliability of the anchor bolt monitoring system were solved, thereby improving the support effect and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN ZHENGLONG COAL IND CO LTD SUBURBAN COAL MINE
- Filing Date
- 2025-10-09
- Publication Date
- 2026-07-24
AI Technical Summary
Existing anchor monitoring systems are unable to fully reflect real-time changes in surrounding rock stress, lack real-time detection capabilities for the grouting process, and the anchoring components are prone to loosening or retraction, affecting the support effect.
Design an anchoring device that can monitor stress and grouting quality, with built-in sensor circuit channels and grouting channels, equipped with stress monitoring components, grouting monitoring components and anchoring components, to achieve real-time data acquisition and mechanical locking.
It enables real-time monitoring of anchor stress and grouting quality, improves the accuracy of support effect assessment, prevents anchor components from loosening, and enhances anchor reliability and support life.
Smart Images
Figure CN224550155U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mine support technology, and in particular to an anchoring device that can monitor stress and grouting quality. Background Technology
[0002] In coal mining and tunnel construction, rock bolt support technology is a commonly used method for reinforcing surrounding rock, effectively improving its stability and suppressing deformation and collapse. However, most existing rock bolt monitoring systems rely on external sensors or independent monitoring holes, resulting in limited monitoring points and insufficient data collection. This makes it difficult to comprehensively reflect real-time changes in surrounding rock stress, affecting the accurate assessment and timely maintenance of the anchoring status. Furthermore, they typically lack real-time monitoring capabilities for the grouting process, making it impossible to accurately determine on-site whether the grout is evenly filled or whether there is leakage or blockage.
[0003] In addition, most existing anchor bolts do not have mechanical locking structures. The anchoring components rely only on friction or simple limiting and fixing, which can easily loosen or shrink under long-term stress or vibration, resulting in weakened anchoring force or even failure, thus affecting the support effect.
[0004] Therefore, there is an urgent need for an anchoring device that can monitor stress and grouting quality, which can effectively solve the problems that traditional anchors cannot fully reflect the real-time changes in surrounding rock stress and lack the function of real-time monitoring of grout flow and pressure, resulting in the inability to evaluate the support effect in real time and the inability to accurately control the grouting quality. Utility Model Content
[0005] The purpose of this invention is to provide an anchoring device that can monitor stress and grouting quality, so as to solve the problems existing in the prior art.
[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides an anchoring device capable of monitoring stress and grouting quality, comprising an anchor rod body, wherein a grouting channel and a sensor circuit channel are provided inside the anchor rod body, an anchoring component for limiting the anchor rod body is provided at the closed end of the anchor rod body, a data interface for connecting to external monitoring equipment is provided at the end of the anchor rod body away from the anchoring component, a grouting monitoring component for monitoring grouting pressure and grout flow rate is provided in the grout inlet of the grouting channel, a stress monitoring component for monitoring the stress distribution of the surrounding rock is provided on the outer wall of the anchor rod body, and the data interface is electrically connected to the stress monitoring component and the grouting monitoring component.
[0007] Preferably, the anchoring assembly includes a central rod disposed within the grouting channel, with extension portions symmetrically arranged on both sides of the central rod.
[0008] Preferably, the extension portion includes connecting rods symmetrically arranged on one side of the central rod, one end of the connecting rod is rotatably connected to the central rod, and the other end of the connecting rod is rotatably connected to a barb. The barb is rotatably connected to a through hole, which communicates with the grouting channel. The through hole is formed on the anchor body.
[0009] Preferably, a ratchet is installed at one end of the central rod that extends into the grouting channel, and the ratchet is detachably connected to a leaf spring pawl. A slide is provided at the end of the grouting channel, and the leaf spring pawl is installed in the slide.
[0010] Preferably, the stress monitoring component includes a plurality of strain gauges mounted on the outer wall of the anchor bolt body, and the connecting wires of the strain gauges extend into the sensor circuit channel and are electrically connected to the data interface.
[0011] Preferably, the plurality of strain gauges are spirally distributed on the outer wall of the anchor body.
[0012] Preferably, the grouting monitoring component includes a pressure sensor and a flow meter, which are installed inside the grout inlet of the grouting channel.
[0013] Preferably, the connecting wires of the pressure sensor and the flow meter both extend into the sensor circuit channel and are electrically connected to the data interface.
[0014] Preferably, the data interface is installed at the inlet of the sensor line channel.
[0015] Preferably, the inner wall of the grouting channel is provided with a plurality of grouting holes for grouting, and a one-way valve is installed in the grouting hole.
[0016] The present invention discloses the following technical effects: This invention, through stress monitoring components and grouting monitoring components, can not only monitor the stress of anchor bolts and the quality of grouting in real time, but also comprehensively reflect the changes in surrounding rock stress and the state of the grouting process, thereby improving the accuracy of the support effect assessment. At the same time, the anchoring components can effectively limit the anchor bolt body, which can not only effectively prevent the anchoring components from loosening and shrinking, but also effectively improve the anchoring reliability and support life. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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.
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the anchoring component of this utility model when it is unfolded; Figure 3 This is a schematic diagram of the structure of the anchoring component of this utility model when it is retracted; Figure 4 This is a top view of the structure of the component of this utility model when unfolded; Figure 5 This is a schematic diagram of the grouting unit structure of this utility model; The components include: 1. Anchor body; 11. Grouting channel; 111. Grouting hole; 112. Check valve; 12. Sensor wiring channel; 2. Anchoring assembly; 21. Barb; 22. Leaf spring pawl; 23. Middle rod; 24. Connecting rod; 3. Stress monitoring assembly; 31. Strain gauge; 4. Grouting monitoring assembly; 41. Pressure sensor; 42. Flow meter; 5. Data interface. Detailed Implementation
[0019] 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.
[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0021] Reference Figures 1 to 5 This utility model discloses an anchoring device for monitoring stress and grouting quality, including an anchor body 1. The anchor body 1 has a grouting channel 11 and a sensor circuit channel 12 inside. The closed end of the anchor body 1 is provided with an anchoring component 2 for limiting the anchor body 1. The end of the anchor body 1 away from the anchoring component 2 is provided with a data interface 5 for connecting to external monitoring equipment. The grouting channel 11 has a grouting monitoring component 4 for monitoring grouting pressure and grout flow rate inside the grouting inlet. The outer wall of the anchor body 1 is provided with a stress monitoring component 3 for monitoring the stress distribution of the surrounding rock. The data interface 5 is electrically connected to the stress monitoring component 3 and the grouting monitoring component 4.
[0022] The sensor circuit channel 12 is a long and narrow groove with an inner wall coated with insulating and waterproof material.
[0023] This invention, through the stress monitoring component 3 and the grouting monitoring component 4, can not only monitor the anchor stress and grouting quality in real time, but also comprehensively reflect the changes in surrounding rock stress and the state of the grouting process, thereby improving the accuracy of the support effect assessment. At the same time, the anchoring component 2 can effectively limit the anchor body 1, which can not only effectively prevent the anchoring components from loosening and shrinking, but also effectively improve the anchoring reliability and support life.
[0024] In a further optimized design, the anchoring assembly 2 includes a central rod 23 disposed within the grouting channel 11, with extension portions symmetrically arranged on both sides of the central rod 23. This allows the central rod 23 to move along the grouting channel 11.
[0025] The design is further optimized. The extension part includes connecting rods 24 symmetrically arranged on one side of the middle rod 23. One end of the connecting rod 24 is rotatably connected to the middle rod 23, and the other end of the connecting rod 24 is rotatably connected to a barb 21. The barb 21 is rotatably connected to a through hole, which is connected to the grouting channel 11. The through hole is opened on the anchor body 1.
[0026] In a further optimized design, a ratchet is installed at one end of the central rod 23 that extends into the grouting channel 11. The ratchet is detachably connected to a leaf spring pawl 22. A slide is provided at the end of the grouting channel 11, and the leaf spring pawl 22 is installed in the slide.
[0027] The barb 21 is made of 65Mn spring steel with a thickness of 1.5mm. The center rod 23 is made of alloy steel with a heat-treated and hardened surface, and has a toothed ratchet at the top for engaging with the leaf spring pawl 22 to achieve one-way mechanical locking. The barb 21 is rotatably connected to the connecting rod 24 and the anchor rod body 1 via a pin, and the connecting rod 24 is rotatably connected to the center rod 23 via a pin.
[0028] The middle rod 23 moves into the grouting channel 11. The middle rod 23, through the connecting rod 24, causes the barb 21 to mechanically unfold from the folded state, that is, the barb 21 extends out of the through hole. At this time, the leaf spring pawl 22 is springed outward by the spring preload, allowing the ratchet to slide through.
[0029] When the middle rod 23 retracts, that is, when the middle rod 23 moves outward from the grouting channel 11, the ratchet tooth and the leaf spring pawl 22 engage and lock together to prevent the barb 21 from retracting.
[0030] The unfolding of the barbs 21 not only prevents the anchoring components from loosening and retracting, but also improves the anchoring reliability and support life.
[0031] The scheme is further optimized. The stress monitoring component 3 includes multiple strain gauges 31 installed on the outer wall of the anchor body 1. The connecting wires of the strain gauges 31 extend into the sensor circuit channel 12 and are electrically connected to the data interface 5.
[0032] In a further optimized design, multiple strain gauges 31 are spirally distributed on the outer wall of the anchor body 1. The multiple strain gauges 31 are spirally distributed along the outer surface of the anchor body 1 with a pitch of 300 mm.
[0033] The strain gauge 31 is a foil resistance strain gauge with a resistance of 350Ω and a sensitivity coefficient of 2.0. The surface is coated with an anti-corrosion epoxy resin coating and is fixed to the surface of the anchor body 1 with epoxy resin waterproof adhesive.
[0034] Further optimization of the scheme: the grouting monitoring component 4 includes a pressure sensor 41 and a flow meter 42, which are installed in the grout inlet of the grouting channel 11.
[0035] In a further optimized design, the connecting wires of the pressure sensor 41 and the flow meter 42 are both inserted into the sensor circuit channel 12 and electrically connected to the data interface 5.
[0036] The pressure sensor 41 is encapsulated in a 316L stainless steel housing, with a measurement range of 0-10MPa and an accuracy of 0.5 grade; the flow meter 42 is an electromagnetic flow meter, made of a combination of corrosion-resistant plastic and stainless steel, which is suitable for the varying viscosity of slurries.
[0037] The design was further optimized, with data interface 5 installed at the inlet of sensor line channel 12. Data interface 5 adopts a waterproof aviation plug structure, with an aluminum alloy shell and a rubber sealing ring, supporting quick plug-and-play connection.
[0038] Data interface 5 uses a waterproof and corrosion-resistant design and a fast data interface to enable stable operation of the sensor and convenient data transmission, enhancing the practicality and ease of maintenance of the device.
[0039] To further optimize the design, multiple grouting holes 111 are provided on the inner wall of the grouting channel 11 for grouting, and a one-way valve 112 is installed in the grouting hole 111.
[0040] Grouting holes 111 are arranged along grouting channel 11 with a pitch of 50mm. Each grouting hole 111 is equipped with a one-way valve 112. The one-way valve 112 is a 304 stainless steel spring valve with a spring stiffness of 8N / mm and an opening pressure set to 0.8MPa±10%.
[0041] By installing a one-way valve 112 in the grouting channel 11, not only can the backflow of grout be effectively prevented and the grouting be ensured to be uniformly filled, but the leakage and blockage of grout can also be effectively avoided, thus improving the grouting quality.
[0042] Working process: First, pre-drill holes are made in the roof of the roadway using drilling equipment, and then the anchor bolt body 1 is inserted into the hole; the hydraulic jacking device is used to push the middle rod 23, which drives the connecting rod 24 to mechanically unfold the barbs 21 from the folded state and insert them into the surrounding rock to achieve initial anchoring; at this time, the steep surface of the ratchet at the end of the middle rod 23 fits against the leaf spring pawl 22, forming a mechanical lock, realizing one-way mechanical locking of the barbs 21; then the grouting pump is connected to inject grout into the grouting channel 11, and the grout in the grouting channel 11 flows evenly into the surrounding rock fissures through multiple grouting holes 111; pressure sensing... The device 41 and flow meter 42 monitor the grouting pressure and grout flow rate in real time. The strain gauge 31 collects the surrounding rock stress data in real time along the outer surface of the anchor body 1. The signal is transmitted to the data interface 5 outside the borehole of the anchor body 1 through the sensor line channel 12. The data interface 5 transmits the data to the external monitoring equipment, which performs data acquisition and analysis. After grouting is completed, the grouting pump is turned off, and the one-way valve 112 is automatically closed to prevent grout backflow. If abnormal stress or grouting quality is found, grouting equipment can be connected for supplementary grouting to ensure the long-term stability of the anchoring effect.
[0043] This invention enables real-time monitoring and precise control of anchor stress and grouting quality, and supports mechanical locking to prevent anchor components from retracting, thereby improving the overall reinforcement effect and stability of the surrounding rock, enhancing the controllability of construction quality and the real-time nature of monitoring, and ensuring operational safety and economic benefits.
[0044] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "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 utility model 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 utility model.
[0045] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.
Claims
1. An anchoring device capable of monitoring stress and grouting quality, characterized in that: The system includes an anchor body (1), which has a grouting channel (11) and a sensor circuit channel (12) inside. The closed end of the anchor body (1) is provided with an anchoring component (2) for limiting the anchor body (1). The end of the anchor body (1) away from the anchoring component (2) is provided with a data interface (5) for connecting to an external monitoring device. The grouting inlet of the grouting channel (11) is provided with a grouting monitoring component (4) for monitoring grouting pressure and grout flow rate. The outer wall of the anchor body (1) is provided with a stress monitoring component (3) for monitoring the stress distribution of the surrounding rock. The data interface (5) is electrically connected to the stress monitoring component (3) and the grouting monitoring component (4).
2. The anchoring device for monitoring stress and grouting quality according to claim 1, characterized in that: The anchoring assembly (2) includes a central rod (23) disposed in the grouting channel (11), and extension portions are symmetrically arranged on both sides of the central rod (23).
3. The anchoring device for monitoring stress and grouting quality according to claim 2, characterized in that: The extension includes a connecting rod (24) symmetrically arranged on one side of the middle rod (23). One end of the connecting rod (24) is rotatably connected to the middle rod (23), and the other end of the connecting rod (24) is rotatably connected to a barb (21). The barb (21) is rotatably connected to a through hole, which is connected to the grouting channel (11). The through hole is opened on the anchor body (1).
4. The anchoring device for monitoring stress and grouting quality according to claim 3, characterized in that: The middle rod (23) is fitted with a ratchet at one end that extends into the grouting channel (11). The ratchet is detachably connected to a leaf spring pawl (22). A slide is provided at the end of the grouting channel (11), and the leaf spring pawl (22) is installed in the slide.
5. The anchoring device for monitoring stress and grouting quality according to claim 1, characterized in that: The stress monitoring component (3) includes a plurality of strain gauges (31) installed on the outer wall of the anchor body (1), and the connecting wires of the strain gauges (31) extend into the sensor circuit channel (12) and are electrically connected to the data interface (5).
6. The anchoring device for monitoring stress and grouting quality according to claim 5, characterized in that: Multiple strain gauges (31) are spirally distributed on the outer wall of the anchor body (1).
7. The anchoring device for monitoring stress and grouting quality according to claim 1, characterized in that: The grouting monitoring component (4) includes a pressure sensor (41) and a flow meter (42), which are installed in the grout inlet of the grouting channel (11).
8. The anchoring device for monitoring stress and grouting quality according to claim 7, characterized in that: The connecting wires of the pressure sensor (41) and the flow meter (42) both extend into the sensor circuit channel (12) and are electrically connected to the data interface (5).
9. The anchoring device for monitoring stress and grouting quality according to claim 1, characterized in that: The data interface (5) is installed at the inlet of the sensor line channel (12).
10. The anchoring device for monitoring stress and grouting quality according to claim 1, characterized in that: The inner wall of the grouting channel (11) is provided with a plurality of grouting holes (111) for grouting, and a one-way valve (112) is installed in the grouting hole (111).