A monitoring device for anchor prestress in underground hydraulic support systems

Abstract

This invention discloses a monitoring device for the prestress of anchor bodies in underground hydraulic support systems, relating to the field of pressure monitoring technology. It includes a prestress test piece, on which a grouting sealing component is slidably mounted for controlling grouting; an anchoring positioning component is slidably mounted on the prestress test piece; the prestress test piece is used to measure anchor bolt positioning; a stress monitoring device is installed on the grouting sealing component for monitoring stress. This addresses the problem that current monitoring devices for the prestress of anchor bodies in underground hydraulic support systems are inconvenient for simultaneously testing the accuracy of anchor bolt position and controlling grouting after the expansion of the anchor shell meets the standards. By using a prestress test piece in conjunction with a grouting sealing component, it avoids unauthorized grouting operations before reaching the drilling depth, ensuring accurate anchor bolt installation. Furthermore, the use of an anchoring positioning component in this structure further standardizes the grouting operation.

Description

Technical Field

[0001] This invention relates to the field of pressure monitoring technology, specifically to a monitoring device for the prestress of anchor bodies in underground hydraulic support systems. Background Technology

[0002] In actual protective work in tunnels and other locations, anchoring is a common reinforcement method. Anchoring usually involves using anchor bolts in conjunction with steel mesh, with the anchor bolts playing a crucial role. The ends of the anchor bolts are typically equipped with expansion shells for expansion anchoring, followed by grouting of the anchored rock mass. Workers need to monitor the stability of the reinforcement in real time to facilitate timely risk response plans. Currently, the monitoring devices for anchor prestress in underground hydraulic support systems typically employ a simple pressure sensing structure outside the anchor bolt. This makes it inconvenient to perform melt-through testing when monitoring rock mass stability. Grouting pressure and the insertion of the anchor bolt into the anchoring hole can easily erode and solidify, and collisions can interfere with the pressure sensing structure, affecting subsequent testing accuracy. Furthermore, it is inconvenient to simultaneously test the anchoring pressure, resulting in poor monitoring comprehensiveness. It is also inconvenient to simultaneously test the anchor bolt position accuracy and the expansion of the expansion shell to control grouting after achieving the required standards. Direct grouting followed by solidification has poor safety, and the expansion of the expansion shell inside the anchoring hole is difficult to observe.

[0003] Therefore, we propose a monitoring device for the prestress of anchor bodies in underground hydraulic support systems. Summary of the Invention

[0004] The purpose of this invention is to provide a monitoring device for the prestress of anchor bodies in underground hydraulic support systems, in order to solve the problem mentioned in the background art that the current monitoring devices for the prestress of anchor bodies in underground hydraulic support systems are not convenient for simultaneously testing the accuracy of anchor bolt positions and controlling grouting after the expansion of the shell anchoring reaches the standard.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a monitoring device for the prestress of an anchor body in a mine hydraulic support system, comprising a prestress test piece, on which a grouting sealing member is slidably installed, the grouting sealing member being used to control grouting; an anchoring positioning member is slidably installed on the prestress test piece; the prestress test piece is used to measure the positioning of the anchor rod; a stress monitoring device is installed on the grouting sealing member; the stress monitoring device is used to monitor stress; a hot-melt extrusion device is installed on the grouting sealing member; the hot-melt extrusion device is used to compress the stress monitoring device; a void monitoring part is installed on the hot-melt extrusion device; a relaxation test device is installed on the stress monitoring device, and the relaxation test device is used to detect the loosening of the prestress test piece; the prestress test piece includes: an anchor rod monitoring mounting cylinder and a grouting hole, the anchor rod monitoring mounting cylinder having a ring of grouting holes; the anchor rod monitoring mounting cylinder is used for threaded connection to the anchor rod.

[0006] Preferably, the prestressed test piece further includes: a contact plate, wherein a ring of contact plates is fixedly installed inside the anchor monitoring and mounting cylinder; the contact plate is an elastic steel sheet structure.

[0007] Preferably, the grouting sealing component includes: a positioning moving pipe, a grouting groove, a tension spring, a contact ring, and a protective cylinder. The positioning moving pipe is slidably sleeved on the anchor bolt monitoring installation cylinder. The positioning moving pipe has a grouting groove. The inner diameter of the grouting groove is smaller than the inner diameter of the front end of the anchor bolt monitoring installation cylinder. A tension spring is sleeved on the positioning moving pipe. One end of the tension spring is connected to the positioning moving pipe, and the other end of the tension spring is connected to the anchor bolt monitoring installation cylinder. A contact ring is fixedly sleeved on the positioning moving pipe. One ring of the contact piece elastically fits the contact ring. A power supply and an indicator light are connected in series outside the contact piece and the contact ring. A protective cylinder is threadedly connected to the tail end of the positioning moving pipe.

[0008] Preferably, the anchoring component includes: a sliding cylinder, a tension spring, and a baffle plate. The sliding cylinder is slidably installed at the front end of the anchor bolt monitoring installation cylinder. A tension spring is fixedly installed on the side of the sliding cylinder, and the tension spring is located inside the anchor bolt monitoring installation cylinder. The end of the tension spring is connected to the inside of the anchor bolt monitoring installation cylinder. A baffle plate is fixedly installed on the sliding cylinder. The baffle plate is used to fit against the end of the tension spring. The inner diameter of the sliding cylinder is the same as the outer diameter of the positioning moving tube.

[0009] Preferably, the stress monitoring device includes: a monitoring fixing ring, a pressure spring, and a connecting rod. The monitoring fixing ring is fixedly installed inside the positioning moving tube; the pressure spring is fixedly installed on the monitoring fixing ring; the pressure spring is located inside the positioning moving tube; and the connecting rod is fixedly installed in the middle of the pressure spring, and the connecting rod is slidably installed inside the positioning moving tube.

[0010] Preferably, the stress monitoring device further includes: a pressure sensor and a detection column, wherein the pressure sensor is slidably mounted on the positioning moving tube; the pressure sensor is connected to the end of the pressure spring; the detection column is slidably mounted on the inner side of the positioning moving tube; the end of the pressure sensor is attached to the detection column, and the top of the detection column is a hemispherical structure.

[0011] Preferably, the hot-melt extrusion device includes: a detection displacement column, a connecting ring, an electric heating ring, and an anti-drip sheet. The end of the detection displacement column is located inside the positioning moving tube; the connecting ring is fixedly installed on the outside of the detection displacement column and is sleeved inside the positioning moving tube; the end of the detection displacement column has a hemispherical structure, and the detection displacement column is aligned with the detection column; the electric heating ring is sleeved on the front side of the positioning moving tube; the electric heating ring is aligned with the connecting ring; an anti-drip sheet is fixedly installed on the outside of the detection displacement column and is located below the connecting ring; the electric heating ring is used for hot-melting the connecting ring.

[0012] Preferably, the hollow detection unit includes: a monitoring connecting plate, a sliding cylinder, a sliding column, and a micro switch. The monitoring connecting plate is fixedly installed on the top of the detection displacement column; the sliding cylinder is fixedly installed on the monitoring connecting plate; the sliding column is slidably installed on the sliding cylinder; the micro switch is installed on the monitoring connecting plate; the end of the micro switch is connected to the sliding column; a spring is provided between the sliding column and the monitoring connecting plate; a power supply and an indicator light are connected in series outside the micro switch.

[0013] Preferably, the relaxation testing device includes: a traction linkage wire and a prestressed nut, the end of the traction linkage wire being connected to the middle of the connecting rod; the prestressed nut being threaded onto the anchor rod; the prestressed nut having an insertion hole; the traction linkage wire being located inside the protective cylinder; and the end of the traction linkage wire being inserted into the insertion hole of the prestressed nut.

[0014] Preferably, the relaxation testing device further includes: a positioning bolt, which is threaded onto the prestressed nut; the end of the positioning bolt is used to press and position the traction linkage wire.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention uses prestressed test pieces in conjunction with grouting sealing components, which can improve the accuracy of anchor bolt installation positions and facilitate workers' understanding of drilling precision. It also prevents improper operations such as grouting before reaching the drilling depth, ensuring accurate anchor bolt installation positions. Furthermore, the use of anchoring positioning components in this structure further standardizes grouting operations, ensuring that grouting can only be carried out after the expansion shell has fully expanded, avoiding insufficient anchoring pressure caused by grouting before the expansion shell has fully expanded.

[0017] The hot-melt extrusion device, in conjunction with a stress monitoring device, can detect the internal stability of the anchor hole after grouting. It can provide early warning of collapse inside the anchor rod, covering a comprehensive range. At the same time, the use of an electric heating coil to hot-melt the connecting ring ensures greater stability when the displacement detection column is inserted into the anchor hole, preventing impact from affecting the stability of the pressure sensor. Before the hot-melt connecting ring, the connecting ring can ensure sealing to prevent leakage, which could cause mud to seep into the pressure sensor, causing damage or adhesion and affecting the detection accuracy.

[0018] The relaxation testing device can detect the loosening of prestressing nuts without affecting normal grouting. This prevents loosening of prestressing nuts from going undetected, which could affect safety and the prestressing effect. This is especially important for prestressed anchors, where excessively loose soil and rock can reduce the tightening force of the prestressing nuts on the anchor plate. The hollow detection unit can detect hollow areas in the soil and rock within the anchor hole. This allows for more targeted and accurate detection, enabling timely detection of separation between the grout and the anchor hole and prompting the development of risk mitigation measures. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a monitoring device for anchor prestress in a mine hydraulic support system according to the present invention.

[0020] Figure 2 This is a schematic diagram of a monitoring device for the prestress of an anchor body in a mine hydraulic support system, as described in this invention, installed on an anchor bolt for monitoring.

[0021] Figure 3 This is a cross-sectional view of the grouting sealing component structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the anchoring component structure of the present invention;

[0023] Figure 5 For the present invention Figure 3 Enlarged view of the structure of region B in the middle;

[0024] Figure 6 For the present invention Figure 4 Enlarged view of the structure of region C in the middle;

[0025] Figure 7 This is a schematic diagram of the hot melt extrusion device of the present invention;

[0026] Figure 8 For the present invention Figure 3 Enlarged view of the structure of region D in the middle;

[0027] Figure 9 For the present invention Figure 3 Enlarged view of the structure of region E in the middle;

[0028] Figure 10 This is a schematic diagram showing the installation position of the traction linkage wire in this invention;

[0029] Figure 11 For the present invention Figure 3 Enlarged view of the structure of region G in the middle.

[0030] In the diagram: 1. Prestressed test piece; 101. Anchor bolt monitoring installation cylinder; 102. Grouting hole; 103. Electrical contact plate; 2. Grouting sealing component; 201. Positioning moving tube; 2011. Grouting groove; 202. Tension spring; 203. Electrical contact ring; 204. Protective cylinder; 3. Anchoring positioning component; 301. Sliding cylinder; 302. Expansion shell tension spring; 303. Baffle plate; 4. Stress monitoring device; 401. Monitoring fixing ring; 402. Compression spring; 403. Connecting rod; 404. Pressure sensor; 405. Detection column; 5. Hot melt extrusion device; 501. Detection displacement column; 5011. Connecting ring; 502. Electric heating ring; 503. Anti-drip sheet; 6. Hollow detection unit; 601. Monitoring connecting plate; 602. Sliding cylinder; 603. Sliding column; 604. Micro switch; 7. Relaxation test device; 701. Traction linkage wire; 702. Prestressed nut; 703. Positioning bolt. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1: Please refer to Figures 1 to 11 As shown:

[0033] This invention provides a technical solution: a monitoring device for the prestress of an anchor body in a mine hydraulic support system, comprising a prestress test piece 1, a grouting sealing member 2 slidably mounted on the prestress test piece 1 for controlling grouting; an anchoring positioning member 3 slidably mounted on the prestress test piece 1 for measuring anchor positioning; a stress monitoring device 4 mounted on the grouting sealing member 2 for monitoring stress; a hot-melt extrusion device 5 mounted on the grouting sealing member 2 for compressing the stress monitoring device 4; a hollow detection part 6 mounted on the hot-melt extrusion device 5; and a relaxation test device 7 mounted on the stress monitoring device 4 for detecting loosening of the prestress test piece 1; the prestress test piece 1 includes: an anchor monitoring mounting cylinder 101 and a grouting hole 102, the anchor monitoring mounting cylinder 101 having a ring of grouting holes 102; the anchor monitoring mounting cylinder 101 being threadedly connected to the anchor rod.

[0034] The prestressed test piece 1 further includes: a contact plate 103, which is fixedly installed inside the anchor bolt monitoring installation cylinder 101; the contact plate 103 is an elastic steel sheet structure; the grouting sealing component 2 includes: a positioning moving pipe 201, a grouting groove 2011, a tension spring 202, a contact ring 203, and a protective cylinder 204. The positioning moving pipe 201 is slidably sleeved on the anchor bolt monitoring installation cylinder 101; a grouting groove 2011 is provided on the positioning moving pipe 201; the inner diameter of the grouting groove 2011 is smaller than the inner diameter of the front end of the anchor bolt monitoring installation cylinder 101; a tension spring 202 is sleeved on the positioning moving pipe 201; one end of the tension spring 202 is connected to the positioning moving pipe 201, and the other end of the tension spring 202 is connected to the anchor bolt monitoring installation cylinder 101; A contact ring 203 is fixedly sleeved on the positioning moving tube 201; a ring of contact plates 103 elastically fits the contact ring 203; a power supply and an indicator light are connected in series outside the ring of contact plates 103 and the contact ring 203; a protective cylinder 204 is threadedly connected to the tail of the positioning moving tube 201; the anchoring positioning component 3 includes: a sliding cylinder 301, a tension spring 302, and a baffle 303. The sliding cylinder 301 is slidably installed at the front end of the anchor bolt monitoring installation cylinder 101; a tension spring 302 is fixedly installed on the side of the sliding cylinder 301, and the tension spring 302 is located inside the anchor bolt monitoring installation cylinder 101; the end of the tension spring 302 is connected to the inside of the anchor bolt monitoring installation cylinder 101; a baffle 303 is fixedly installed on the sliding cylinder 301; the baffle 303 is used to fit against the end of the tension spring.The inner diameter of the sliding cylinder 301 is the same as the outer diameter of the positioning moving tube 201. Using the prestressed test piece 1 in conjunction with the grouting sealing piece 2 improves the accuracy of the anchor bolt installation position, facilitates workers' understanding of drilling precision, and prevents improper operation such as grouting before reaching the drilling depth. This ensures accurate anchor bolt installation. Furthermore, the use of the anchoring positioning piece 3 further standardizes the grouting operation, ensuring that grouting can only be performed after the expansion shell has fully expanded, preventing insufficient anchoring pressure caused by grouting before the expansion shell is fully expanded. The structure is simpler, ensuring anchoring quality and guaranteeing the structural firmness after grouting. Forcefully pushing the anchor bolt monitoring and installation cylinder 101 into the anchoring hole causes the hot-melt extrusion device 5 to collide with the bottom of the hole, extruding and causing the positioning moving tube 201 to retract. At this time, the grouting groove 2011 is misaligned with the front side of the anchor bolt monitoring and installation cylinder 101, preventing... The slurry flows smoothly, but as the rotating anchor rod retracts, the expansion shell on the anchor rod expands. Because the expansion shell's slips are a sliding expansion structure, when the expansion shell is not expanded, one side of the slips will protrude and press against the baffle 303, causing it to drive the sliding cylinder 301 to extend and block the slurry channel 2011. At this time, as the anchor rod drives the anchor rod monitoring installation cylinder 101 to retract, the expansion shell expansion can be controlled. When the expansion shell expands, it will also displace outward and towards the contact ring 203, no longer pressing the baffle 303. After the baffle 303 is no longer pressed, it can retract under the pull of the expansion shell tension spring 302, no longer blocking the slurry channel 2011. At this time, as the anchor rod monitoring installation cylinder 101 retracts to its position, the slurry channel 2011 gradually extends under the pull of the tension spring 202. At this time, the slurry channel 2011 aligns with the sliding cylinder 301 and is no longer blocked by the sliding cylinder 301 and the inner hole of the positioning moving pipe 201, and grouting can then be performed.

[0035] The stress monitoring device 4 includes: a monitoring fixing ring 401, a pressure spring 402, and a connecting rod 403. The monitoring fixing ring 401 is fixedly installed inside the positioning moving tube 201; the pressure spring 402 is fixedly installed on the monitoring fixing ring 401; the pressure spring 402 is located inside the positioning moving tube 201; the connecting rod 403 is fixedly installed in the middle of the pressure spring 402, and the connecting rod 403 is slidably installed inside the positioning moving tube 201; the stress monitoring device 4 also includes: a pressure sensor 404 and a detection column 405. An SBT732 pressure sensor 404 can be used, along with a matching display. The pressure sensor 404 is slidably installed on the positioning moving tube 201; the pressure sensor 404 is connected to the end of the pressure spring 402; a detection column 405 is slidably installed inside the positioning moving tube 201; the end of the pressure sensor 404 is attached to the detection column 405, and the top of the detection column 405 is a hemispherical structure; the hot melt extrusion device 5 includes: a detection displacement column 501, a connecting ring 5011, an electric heating ring 502, and an anti-drip sheet 503. The end of the detection displacement column 501 is located inside the positioning moving tube 201; a connecting ring 5011 is fixedly installed on the outside of the detection displacement column 501, and the connecting ring 5011 is sleeved on the inside of the positioning moving tube 201; the end of the detection displacement column 501 is a hemispherical structure, and the detection displacement column 501 is aligned with the detection column 405; the electric heating ring 502 is sleeved on the positioning moving tube 201. The front side of the moving tube 201; the electric heating coil 502 is aligned with the connecting ring 5011; a ring of anti-drip pads 503 is fixedly installed on the outside of the detection displacement column 501, and the ring of anti-drip pads 503 is located below the connecting ring 5011; the electric heating coil 502 is used to heat-melt the connecting ring 5011. The hot-melt extrusion device 5 can be used in conjunction with the stress monitoring device 4 to detect the internal stability of the anchor hole after grouting, and can provide early warning of collapse inside the anchor rod. This structure has direct detection and comprehensive range. At the same time, by using the electric heating coil 502 to heat-melt the connecting ring 5011, the detection displacement column 501 can be more stable when it is inserted into the anchor hole, and will not be affected by collisions, thus ensuring the stability of the pressure sensor 404. By employing a heat-fusion connecting ring 5011, the ring 5011 ensures a tight seal, preventing leakage and ensuring that mud can seep into the pressure sensor 404, causing damage and adhesion, thus affecting detection accuracy. This structure is more rational. After the mud has solidified, the connecting ring 5011 can be heat-fused to ensure accurate detection. After grouting through the anchor bolt, once the mud has solidified, the electric heating ring 502 can be controlled to heat-fused the connecting ring 5011. Once the displacement detection column 501 is squeezed and displaced, the hemispherical structure at the bottom of the displacement detection column 501 will no longer be aligned with the detection column 405. The data can then be displayed in real time on the external display of the pressure sensor 404, ensuring stability and reliability.

[0036] The hollow detection unit 6 includes: a monitoring connection plate 601, a sliding cylinder 602, a sliding column 603, and a micro switch 604. The monitoring connection plate 601 is fixedly installed on the top of the detection displacement column 501; the sliding cylinder 602 is fixedly installed on the monitoring connection plate 601; the sliding column 603 is slidably installed on the sliding cylinder 602; the micro switch 604 is installed on the monitoring connection plate 601; the end of the micro switch 604 is connected to the sliding column 603; a spring is provided between the sliding column 603 and the monitoring connection plate 601; a power supply and an indicator light are connected in series with the micro switch 604. The hollow detection unit 6 can be used to detect the hollowing problem of soil and rock in the anchoring hole, which can facilitate targeted detection and is accurate and reliable. It can detect the separation between the mud and the anchoring hole in time and make timely risk response plans. Once a hollowing occurs in the anchoring hole and the distance between the mud and the sliding column 603 increases, the micro switch 604 will control the external indicator light to light up as a warning.

[0037] In Example 2, based on Example 1, the relaxation testing device 7 includes: a traction linkage wire 701 and a prestressed nut 702. The end of the traction linkage wire 701 is connected to the middle of the connecting rod 403; the prestressed nut 702 is threaded onto the anchor rod; the prestressed nut 702 has an insertion hole; the traction linkage wire 701 is located inside the protective sleeve 204; the end of the traction linkage wire 701 is inserted into the insertion hole of the prestressed nut 702; the relaxation testing device 7 also includes: a positioning bolt 703, which is threaded onto the prestressed nut 702; the end of the positioning bolt 703 is used to press and position the traction linkage wire 701. Using the relaxation testing device 7, while not affecting normal grouting, it can be used to detect loosening of the prestressed nut 702, preventing the prestressed nut 702 from going undetected and affecting safety, and also affecting... The prestressing effect, especially for prestressed anchor bolts, is affected by the looseness of the soil and rock. This can lead to a decrease in the tightening force of the prestressing nut 702 on the anchor plate. Since there is inherent play between the prestressing nut 702 and the anchor bolt, loosening of the prestressing nut 702 can affect structural stability, reduce load-bearing capacity, and increase the risk of safety accidents. Simultaneously, the positioning bolt 703 can be detected by the pressure sensor 404. After anchor grouting, if the positioning bolt 703 becomes loose or wobbles, the traction linkage 701 will displace under the pressure of the compression spring 402. This will change the pulling force of the connecting rod 403 on the compression spring 402, which can be detected by the pressure sensor 404 for timely alerts, ensuring comprehensive detection and preventing any impact on the prestressing effect.

[0038] The working principle of this embodiment is as follows: First, after threading the anchor bolt monitoring installation cylinder 101 onto the anchor bolt and inserting the anchor bolt into the anchoring hole, the anchor bolt monitoring installation cylinder 101 can be pushed forcefully into the anchoring hole. This causes the hot-melt extrusion device 5 to collide with the bottom of the hole, and the extrusion causes the positioning moving tube 201 to retract. At this time, the grouting groove 2011 is misaligned with the front side of the anchor bolt monitoring installation cylinder 101, preventing the flow of grout. However, as the anchor bolt retracts, when the expansion shell on the anchor bolt is controlled to expand, because the expansion shell's slip is a sliding expansion structure, when the expansion shell is not expanded, one side of its slip will protrude and press against the baffle 303, causing it to drive the sliding cylinder 301 to extend and block the grouting groove 2011. At this time, as the anchor bolt drives the anchor bolt monitoring installation cylinder 101 to retract, the expansion can be controlled. As the shell expands, it also shifts outward and towards the contact ring 203, no longer compressing the baffle 303. Once the baffle 303 is no longer compressed, it retracts under the pull of the shell expansion spring 302, no longer obstructing the grouting groove 2011. At this point, as the anchor bolt monitoring installation cylinder 101 retracts into position, the grouting groove 2011 gradually extends under the pull of the spring 202, aligning with the sliding cylinder 301 and no longer obstructed by the inner hole of the sliding cylinder 301 and the positioning moving tube 201. The contact ring 203 then contacts the contact piece 103, and the indicator light connected in series externally illuminates, indicating that grouting can begin. This ensures that grouting can only be performed after the anchor bolt is in position and the shell has expanded, allowing for heat treatment after the grout has solidified. The fusion coupling ring 5011 ensures accurate detection. After grouting through the anchor bolt and waiting for the slurry to solidify, the electric heating ring 502 can be controlled to heat-melt the coupling ring 5011. The anti-drip plate 503 can catch the molten drips. Subsequently, if the slurry inside the anchor hole breaks and is compressed due to factors such as collapse, the detection displacement column 501 will be squeezed and displaced. At this time, the hemispherical structure at the bottom of the detection displacement column 501 will no longer be aligned with the detection column 405, and the detection column 405 will also displace. The pressure acting on the pressure sensor 404 will change, and the data can be displayed in real time on the external display of the pressure sensor 404. When the detection displacement column 501 is inserted into the anchor hole, the detection displacement column 501 will drive the sliding cylinder 602 to fit against it. Inside the anchoring hole, the inner wall of the anchoring hole simultaneously compresses the sliding column 603, thereby pressing the micro switch 604. If a void appears in the anchoring hole later, increasing the distance between the sliding column 603 and the void, the micro switch 604 will control the external indicator light to illuminate. As the slurry solidifies, the positioning moving tube 201 and the tension spring 202 will be fixed by the solidified slurry. A release agent can be applied to the outside of the protective cylinder 204. The hexagonal column at the end of the protective cylinder 204 can be directly rotated using a wrench for disassembly. At this time, the traction linkage wire 701 can be passed through the prestressed nut 702, the positioning bolt 703 can be tightened for positioning, and the traction linkage wire 701 can be pulled slightly to move the connecting rod 403, because the connecting rod 403 is located in the middle of the pressure spring 402.At this time, the pressure spring 402 can still hold the compression detection column 405. When the positioning bolt 703 loosens and shakes, the traction linkage wire 701 will shift under the compression of the pressure spring 402. At this time, the pulling force of the connecting rod 403 on the pressure spring 402 will change, and the pressure sensor 404 can detect the pressure change and provide timely prompts.

[0039] 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 a process, method, article, or apparatus.

[0040] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A monitoring device for the prestress of an anchor body in a mine hydraulic support system, comprising a prestress test piece (1), wherein a grouting sealing member (2) is slidably mounted on the prestress test piece (1), characterized in that: The grouting sealing component (2) is used to control grouting; the prestressed test piece (1) is slidably installed with an anchoring positioning component (3); the prestressed test piece (1) is used to measure the positioning of the anchor rod; The grouting seal (2) is equipped with a stress monitoring device (4); the stress monitoring device (4) is used to monitor stress; the grouting seal (2) is equipped with a hot melt extrusion device (5); the hot melt extrusion device (5) is used to extrude stress monitoring device (4). The hot melt extrusion device (5) is equipped with a hollow detection unit (6); The stress monitoring device (4) is equipped with a relaxation test device (7), and the relaxation test device (7) is used to detect the loosening of the prestressed test piece (1); The prestressed test piece (1) includes: an anchor monitoring installation cylinder (101) and a grouting hole (102). A ring of grouting holes (102) is provided on the anchor monitoring installation cylinder (101). The anchor monitoring installation cylinder (101) is used for threaded connection to the anchor rod. The prestressed test piece (1) further includes: a contact plate (103), and a ring of contact plates (103) is fixedly installed inside the anchor monitoring installation cylinder (101); the contact plate (103) is an elastic steel sheet structure; The grouting sealing component (2) includes: a positioning moving tube (201), a grouting groove (2011), a tension spring (202), a contact ring (203), and a protective sleeve (204). The positioning moving tube (201) is slidably sleeved on the anchor bolt monitoring installation sleeve (101). A grouting groove (2011) is provided on the positioning moving tube (201). The inner diameter of the grouting groove (2011) is smaller than the inner diameter of the front end of the anchor bolt monitoring installation sleeve (101). A tension spring (202) is sleeved on the positioning moving tube (201). 202); the end of the tension spring (202) is connected to the positioning moving tube (201), and the other end of the tension spring (202) is connected to the anchor monitoring installation cylinder (101); a contact ring (203) is fixedly sleeved on the positioning moving tube (201); a ring of the contact plate (103) elastically fits the contact ring (203); a power supply and an indicator light are connected in series outside the ring of the contact plate (103) and the contact ring (203); a protective cylinder (204) is threadedly connected to the tail of the positioning moving tube (201). The stress monitoring device (4) includes: a monitoring fixing ring (401), a pressure spring (402) and a connecting rod (403). The monitoring fixing ring (401) is fixedly installed inside the positioning moving tube (201); the pressure spring (402) is fixedly installed on the monitoring fixing ring (401); the pressure spring (402) is located inside the positioning moving tube (201); the connecting rod (403) is fixedly installed in the middle of the pressure spring (402), and the connecting rod (403) is slidably installed inside the positioning moving tube (201).

2. The monitoring device for anchor prestress in a mine hydraulic support system according to claim 1, characterized in that: The anchoring positioning component (3) includes: a sliding cylinder (301), a tension spring (302), and a baffle (303). The sliding cylinder (301) is slidably installed at the front end of the anchor monitoring mounting cylinder (101). The tension spring (302) is fixedly installed on the side of the sliding cylinder (301), and the tension spring (302) is located inside the anchor monitoring mounting cylinder (101). The end of the tension spring (302) is connected to the inside of the anchor monitoring mounting cylinder (101). The baffle (303) is fixedly installed on the sliding cylinder (301). The baffle (303) is used to fit against the end of the tension spring. The inner diameter of the sliding cylinder (301) is the same as the outer diameter of the positioning moving tube (201).

3. The monitoring device for anchor prestress in a mine hydraulic support system according to claim 1, characterized in that: The stress monitoring device (4) further includes: a pressure sensor (404) and a detection column (405). The pressure sensor (404) is slidably mounted on the positioning moving tube (201). The pressure sensor (404) is connected to the end of the pressure spring (402). The detection column (405) is slidably mounted on the inner side of the positioning moving tube (201). The end of the pressure sensor (404) is attached to the detection column (405), and the top of the detection column (405) is a hemispherical structure.

4. The monitoring device for anchor prestress in a mine hydraulic support system according to claim 3, characterized in that: The hot melt extrusion device (5) includes: a detection displacement column (501), a connecting ring (5011), an electric heating ring (502), and an anti-drip sheet (503). The end of the detection displacement column (501) is located inside the positioning moving tube (201). The connecting ring (5011) is fixedly installed on the outside of the detection displacement column (501), and the connecting ring (5011) is sleeved inside the positioning moving tube (201). The end of the detection displacement column (501) is a hemispherical knot. The structure includes a displacement detection column (501) aligned with a detection column (405); an electric heating coil (502) sleeved on the front side of the positioning moving tube (201); the electric heating coil (502) aligned with the connecting ring (5011); a ring of anti-drip pads (503) fixedly installed on the outside of the displacement detection column (501), and the ring of anti-drip pads (503) located below the connecting ring (5011); the electric heating coil (502) is used to heat melt the connecting ring (5011).

5. A monitoring device for anchor prestress in a mine hydraulic support system according to claim 4, characterized in that: The hollow detection unit (6) includes: a monitoring connection plate (601), a slide cylinder (602), a slide column (603), and a micro switch (604). The monitoring connection plate (601) is fixedly installed on the top of the detection displacement column (501). The slide cylinder (602) is fixedly installed on the monitoring connection plate (601). The slide column (603) is slidably installed on the slide cylinder (602). The micro switch (604) is installed on the monitoring connection plate (601). The end of the micro switch (604) is connected to the slide column (603). A spring is provided between the slide column (603) and the monitoring connection plate (601). A power supply and an indicator light are connected in series outside the micro switch (604).

6. The monitoring device for anchor prestress in a mine hydraulic support system according to claim 1, characterized in that: The relaxation test device (7) includes: a traction linkage wire (701) and a prestressed nut (702). The end of the traction linkage wire (701) is connected to the middle of the connecting rod (403). The prestressed nut (702) is used to be threaded onto the anchor rod. The prestressed nut (702) is provided with an insertion hole. The traction linkage wire (701) is located inside the protective cylinder (204). The end of the traction linkage wire (701) is used to be inserted into the insertion hole of the prestressed nut (702).

7. A monitoring device for anchor prestress in a mine hydraulic support system according to claim 6, characterized in that: The relaxation test device (7) further includes: a positioning bolt (703), which is threaded onto the prestressed nut (702); the end of the positioning bolt (703) is used to press the positioning traction linkage wire (701).

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