Anchor body prestress monitoring device for hydraulic support system under mine

Abstract

The invention discloses an anchor body prestress monitoring device for an under-mine hydraulic support system, and relates to the technical field of pressure monitoring. Comprising a prestress test piece, and a grouting sealing piece is installed on the prestress test piece in a sliding mode and used for controlling grouting; an anchoring in-place piece is mounted on the prestress test piece in a sliding manner; the prestress test piece is used for measuring the in-place of the anchor rod; a stress monitoring device is mounted on the grouting sealing piece; the stress monitoring device is used for monitoring stress; the problem that an existing anchor body prestress monitoring device for an under-mine hydraulic supporting system is inconvenient to simultaneously test the position precision of an anchor rod and control grouting after the expansion shell anchoring expansion condition reaches the standard is solved. The pre-stress test piece is matched with the grouting sealing piece, so that illegal operation is avoided, the grouting work is performed when the drilling depth is not reached, the accurate mounting position of the anchor rod is ensured, and meanwhile, the grouting operation can be further standardized by adopting the anchoring in-place piece.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure monitoring, in particular to a monitoring device for anchor prestressing used in an underground hydraulic support system. Background Art

[0002] In actual protection work in tunnels and other locations, anchoring is a common reinforcement method. Anchoring usually uses anchor rods and steel mesh for reinforcement, in which anchor rods play an important role. The end of the anchor rod is usually provided with an expansion shell for expansion anchoring, and then the anchored rock is grouting. The staff needs to understand the reinforcement stability in real time to facilitate timely risk response plans. The current underground hydraulic support system uses an anchor prestressed monitoring device usually using a simple pressure sensing structure outside the anchor rod. It is not convenient to perform fuse testing when monitoring rock stability. When the grouting pressure and the anchor rod are inserted into the anchor hole, it is easy to corrode and solidify and collide to interfere with the pressure detection structure, affecting the subsequent detection accuracy. At the same time, it is not convenient to test the anchor pressure together, the monitoring is not comprehensive, and it is not convenient to test the anchor rod position accuracy and the expansion of the expansion shell anchoring at the same time. After meeting the standards, it is not convenient to control the grouting. The curing safety after direct grouting is poor. At the same time, the expansion of the expansion shell anchoring inside the anchor hole is not easy to observe.

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

[0004] The purpose of the present invention is to provide a monitoring device for anchor prestressing in an underground hydraulic support system, so as to solve the problem in the above-mentioned background technology that the current monitoring device for anchor prestressing in an underground hydraulic support system is not convenient for simultaneously testing the anchor rod position accuracy and controlling grouting after the shell expansion anchoring condition meets the standard.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a monitoring device for prestress of an anchor body for an underground hydraulic support system, comprising a prestressed test piece, a grouting closure piece being slidably mounted on the prestressed test piece, the grouting closure piece being used to control grouting; an anchoring piece being slidably mounted on the prestressed test piece; the prestressed test piece being used to measure the position of the anchor rod; a stress monitoring device being mounted on the grouting closure piece; the stress monitoring device being used to monitor stress; a hot melt extrusion device being mounted on the grouting closure piece; the hot melt extrusion device being used to extrude the stress monitoring device; a hollowing monitoring part being mounted on the hot melt extrusion device; a relaxation testing device being mounted on the stress monitoring device, and the relaxation testing device being used to detect loosening of the prestressed test piece; the prestressed test piece comprising: an anchor monitoring mounting tube and a grouting hole, a circle of grouting holes being provided on the anchor monitoring mounting tube; the anchor monitoring mounting tube being used to be threadedly connected to the anchor rod.

[0006] Preferably, the prestressed test piece further comprises: a power connection plate, a circle of power connection plates is fixedly installed inside the anchor rod monitoring installation tube; the power connection plate is an elastic steel sheet structure.

[0007] Preferably, the grouting closure comprises: a movable tube in place, a grouting groove, a tension spring, an electric connection ring and a protective tube, the movable tube in place is slidably sleeved on the anchor rod monitoring installation tube; a grouting groove is provided on the movable tube in place; the inner diameter of the grouting groove is smaller than the inner diameter of the front end of the anchor rod monitoring installation tube; a tension spring is sleeved on the movable tube in place; the end of the tension spring is connected to the movable tube in place, and the other end of the tension spring is connected to the anchor rod monitoring installation tube; an electric connection ring is fixedly sleeved on the movable tube in place; a circle of the electric connection plate elastically fits the electric connection ring; a circle of the electric connection plate and the electric connection ring are connected in series with a power supply and an indicator light on the outside; the tail of the movable tube in place is threadedly connected with a protective tube.

[0008] Preferably, the anchoring part includes: a sliding tube, an expansion spring and a baffle, the sliding tube is slidably installed at the front end of the anchor rod monitoring installation tube; the side of the sliding tube is fixedly installed with an expansion spring, and the expansion spring is located on the inner side of the anchor rod monitoring installation tube; the end of the expansion spring is connected to the inner side of the anchor rod monitoring installation tube; the sliding tube is fixedly installed with a baffle; the baffle is used to fit on the end of the expansion; the inner diameter of the sliding tube is the same as the outer diameter of the moving tube in place.

[0009] Preferably, the stress monitoring device includes: a monitoring fixed ring, a pressure spring and a connecting rod, the monitoring fixed ring is fixedly installed on the inner side of the movable tube in place; the pressure spring is fixedly installed on the monitoring fixed ring; the pressure spring is located on the inner side of the movable tube in place; a connecting rod is fixedly installed in the middle of the pressure spring, and the connecting rod is slidably installed on the inner side of the movable tube in place.

[0010] Preferably, the stress monitoring device also includes: a pressure sensor and a detection column, the pressure sensor is slidably installed on the movable tube in place; the pressure sensor is connected to the end of the pressure spring; a detection column is slidably installed on the inside of the movable tube in place; 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 on the inner side of the in-place moving tube; a connecting ring is fixedly installed on the outside of the detection displacement column, and the connecting ring is sleeved on the inner side of the in-place moving tube; the end of the detection displacement column is a hemispherical structure, and the detection displacement column and the detection column are aligned; the electric heating ring is sleeved on the front side of the in-place moving tube; the electric heating ring is aligned with the connecting ring; a circle of anti-drip sheet is fixedly installed on the outside of the detection displacement column, and a circle of anti-drip sheet is located below the connecting ring; the electric heating ring is used for hot melt connecting ring.

[0012] Preferably, the hollowing monitoring part includes: a monitoring connecting plate, a slide cylinder, a sliding column and a micro switch, the monitoring connecting plate is fixedly mounted on the top of the detection displacement column; the slide cylinder is fixedly mounted on the monitoring connecting plate; the sliding column is slidably mounted on the slide cylinder; the micro switch is mounted 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; and a power supply and an indicator light are connected in series to the outside of 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 is connected to the middle of the connecting rod; the prestressed nut is used to be threadedly connected to the anchor rod; a socket is provided on the prestressed nut; the traction linkage wire is located in the protective tube; the end of the traction linkage wire is used to be inserted into the socket of the prestressed nut.

[0014] Preferably, the relaxation testing device further comprises: a positioning bolt, wherein the positioning bolt is threadedly connected to the prestressed nut; and the end of the positioning bolt is used for squeezing and positioning the traction linkage wire.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention adopts a prestressed test piece in combination with a grouting closure piece, which can improve the accuracy of the anchor rod installation position, make it easier for workers to understand the drilling accuracy, and avoid illegal operations such as grouting before the drilling depth is reached, ensuring the accuracy of the anchor rod installation position. At the same time, the structure adopts anchoring pieces to further standardize the grouting operation, ensuring that grouting can only be carried out after the shell is fully expanded, avoiding grouting before the shell is fully expanded, resulting in insufficient anchoring pressure of the anchor rod.

[0017] The hot melt extrusion device can be used in conjunction with the stress monitoring device to detect the internal stability of the anchor hole after grouting, and can provide anti-collapse warning for the inside of the anchor rod with a comprehensive range. At the same time, the electric heating ring is used to hot-melt the connecting ring. When the displacement column is inserted into the anchor hole, it can be more stable and will not be collided to affect the stability of the pressure sensor. Before the hot-melt connecting ring, the connecting ring can ensure sealing to avoid leakage, causing mud to penetrate into the pressure sensor and cause damage and adhesion, affecting the detection accuracy.

[0018] The relaxation test device can be used to detect the loosening of prestressed nuts without affecting the normal grouting, so as to avoid the loosening of prestressed nuts going undetected, which will affect the safety and the prestressing effect, especially for prestressed anchor rods. Once the rock and soil are too loose, it will easily cause the tightening force of the prestressed nut on the anchor plate to decrease; the hollowing monitoring unit can be used to detect the rock and soil hollowing problem in the anchor hole, which can make it easier to carry out targeted detection, and the detection is accurate and reliable. It can timely detect the separation between the mud and the anchor hole and make timely risk response plans. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a monitoring device for anchor prestressing for an underground hydraulic support system of the present invention;

[0020] Figure 2 This is a schematic diagram of a monitoring device for anchor prestressing of an underground hydraulic support system of the present invention installed on an anchor rod for monitoring;

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

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

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

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

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

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

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

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

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

[0030] Figure: 1. Prestressed test piece; 101. Anchor monitoring installation tube; 102. Grouting hole; 103. Electrical connection plate; 2. Grouting closure; 201. Positioning movable tube; 2011. Grouting groove; 202. Tension spring; 203. Electrical connection ring; 204. Protective tube; 3. Anchoring element; 301. Sliding tube; 302. Shell expansion spring; 303. Baffle; 4. Stress monitoring device; 401. Monitoring fixing ring; 402. Pressure 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. Hollowing monitoring unit; 601. Monitoring connecting plate; 602. Slide; 603. Slide column; 604. Micro switch; 7. Relaxation test device; 701. Pulling linkage wire; 702. Prestressed nut; 703. Positioning bolt. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

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

[0033] The present invention provides a technical solution: a monitoring device for prestress of an anchor body for an underground hydraulic support system, comprising a prestressed test piece 1, a grouting closure 2 being slidably installed on the prestressed test piece 1, the grouting closure 2 being used to control grouting; an anchoring piece 3 being slidably installed on the prestressed test piece 1; the prestressed test piece 1 being used to measure whether the anchor rod is in position; a stress monitoring device 4 being installed on the grouting closure 2; the stress monitoring device 4 being used to monitor stress; a hot melt extrusion device 5 being installed on the grouting closure 2; the hot melt extrusion device 5 being used to extrude the stress monitoring device 4; a hollowing monitoring part 6 being installed on the hot melt extrusion device 5; a relaxation testing device 7 being installed on the stress monitoring device 4, and the relaxation testing device 7 being used to detect loosening of the prestressed test piece 1; the prestressed test piece 1 comprising: an anchor rod monitoring mounting tube 101 and a grouting hole 102, a circle of grouting holes 102 being provided on the anchor rod monitoring mounting tube 101; the anchor rod monitoring mounting tube 101 being used to be threadedly connected to the anchor rod.

[0034] Among them, the prestressed test piece 1 also includes: a power connection piece 103, a circle of power connection piece 103 is fixedly installed inside the anchor monitoring installation tube 101; the power connection piece 103 is an elastic steel sheet structure; the grouting closure 2 includes: an in-place moving tube 201, a grouting groove 2011, a tension spring 202, a power connection ring 203 and a protective tube 204, the in-place moving tube 201 is slidably sleeved on the anchor monitoring installation tube 101; a grouting groove 2011 is opened on the in-place moving tube 201; the inner diameter of the grouting groove 2011 is smaller than the inner diameter of the front end of the anchor monitoring installation tube 101; a tension spring 202 is sleeved on the in-place moving tube 201; the end of the tension spring 202 is connected to the in-place moving tube 201, and the other end of the tension spring 202 is connected to the anchor monitoring installation tube 101; The movable tube 201 is fixedly sleeved with an electric ring 203; a circle of electric sheet 103 elastically fits the electric ring 203; a circle of electric sheet 103 and the electric ring 203 are connected in series with a power supply and an indicator light; the tail of the movable tube 201 is threadedly connected with a protective tube 204; the anchoring part 3 includes: a sliding tube 301, a shell expansion spring 302 and a baffle 303, and the sliding tube 301 is slidably installed at the front end of the anchor rod monitoring installation tube 101; the side of the sliding tube 301 is fixedly installed with an expansion spring 302, and the expansion spring 302 is located on the inner side of the anchor rod monitoring installation tube 101; the end of the expansion spring 302 is connected to the inner side of the anchor rod monitoring installation tube 101; a baffle 303 is fixedly installed on the sliding tube 301; the baffle 303 is used to fit the end of the expansion shell;The inner diameter of the sliding cylinder 301 is the same as the outer diameter of the in-place movable tube 201. The use of the prestressed test piece 1 in combination with the grouting sealing piece 2 can improve the accuracy of the anchor bolt installation position, make it easier for workers to understand the drilling accuracy, and avoid illegal operations such as grouting before the drilling depth is reached, ensuring the accurate installation position of the anchor bolt. At the same time, the use of the anchoring piece 3 in this structure can further standardize the grouting operation, ensuring that the grouting work can be carried out only after the shell is fully expanded, avoiding grouting before the shell is fully expanded, resulting in insufficient anchoring pressure of the anchor bolt. The structure is simpler, ensuring the anchoring quality, and ensuring the firmness of the structure after grouting. Push the anchor bolt monitoring installation cylinder 101 hard to move into the anchor hole, causing the hot melt extrusion device 5 to collide with the bottom of the hole, and the extrusion drives the in-place movable 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, and cannot be When the bolt is rotated and the bolt is retracted, the expansion shell on the bolt is controlled. Because the slips of the expansion shell are a sliding expansion structure, one side of the slips will protrude when the bolt is not expanded, pressing the blocking piece 303, causing it to drive the sliding cylinder 301 to extend and block the grouting groove 2011. At this time, as the bolt drives the bolt monitoring installation cylinder 101 to retract, the expansion shell can be controlled. When the shell expands, it will also move outward and toward the side of the electric ring 203, no longer squeezing the blocking piece 303. After the blocking piece 303 is no longer squeezed, it can be retracted under the pull of the shell expansion spring 302 and no longer block the grouting groove 2011. At this time, as the bolt monitoring installation cylinder 101 retracts into place, the grouting groove 2011 gradually extends under the pull of the tension spring 202. At this time, the grouting groove 2011 is aligned with the sliding cylinder 301 and is no longer blocked by the sliding cylinder 301 and the inner hole of the moving tube 201 in place, and the grouting work can be carried out.

[0035] Among them, the stress monitoring device 4 includes: a monitoring fixed ring 401, a pressure spring 402 and a connecting rod 403. The monitoring fixed ring 401 is fixedly installed on the inner side of the mobile tube 201; the pressure spring 402 is fixedly installed on the monitoring fixed ring 401; the pressure spring 402 is located on the inner side of the mobile tube 201; a connecting rod 403 is fixedly installed in the middle of the pressure spring 402, and the connecting rod 403 is slidably installed on the inner side of the mobile tube 201; the stress monitoring device 4 also includes: a pressure sensor 404 and a detection column 405. The SBT732 pressure sensor 404 can be used, and a matching display is used. The pressure sensor 404 is slidably installed on the mobile tube 201; the pressure sensor 404 is connected to the end of the pressure spring 402; a detection column 405 is slidably installed on the inner side of the in-place 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 on the inner side of the in-place moving tube 201; a connecting ring 5011 is fixedly installed on the outer side of the detection displacement column 501, and the connecting ring 5011 is sleeved on the inner side of the in-place 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 in-place displacement column The front side of the moving pipe 201; the electric heating ring 502 is aligned with the connecting ring 5011; a circle of anti-drip sheet 503 is fixedly installed on the outside of the detection displacement column 501, and a circle of anti-drip sheet 503 is located below the connecting ring 5011; the electric heating ring 502 is used to hot-melt the connecting ring 5011, and 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 perform anti-collapse warning for the inside of the anchor rod. The detection of this structure is direct and comprehensive. At the same time, the electric heating ring 502 is used to hot-melt the connecting ring 5011. When the detection displacement column 501 is inserted into the anchor hole, it can be more stable and will not be collided to affect the stability of the pressure sensor 404. By adopting the method of hot-melt connection ring 5011, before the hot-melt connection ring 5011, the connection ring 5011 can ensure the sealing and avoid leakage, which causes mud to penetrate into the pressure sensor 404 and cause damage and adhesion, affecting the detection accuracy. The structure is more reasonable. This structure can hot-melt the connection ring 5011 after the mud solidifies to ensure accurate detection. After grouting through the anchor rod, the mud solidifies and the electric heating ring 502 can be controlled to hot-melt the connection ring 5011. Once the displacement column 501 is squeezed and displaced, the hemispherical structure at the bottom of the displacement column 501 is no longer aligned with the detection column 405. The data can be displayed in real time through the external display of the pressure sensor 404, which is stable and reliable.

[0036] Among them, the hollowing monitoring part 6 includes: a monitoring connecting plate 601, a slide 602, a slide column 603 and a micro switch 604. The monitoring connecting plate 601 is fixedly installed on the top of the detection displacement column 501; the slide 602 is fixedly installed on the monitoring connecting plate 601; the slide column 603 is slidably installed on the slide 602; the micro switch 604 is installed on the monitoring connecting 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 connecting plate 601; the micro switch 604 is externally connected in series with a power supply and an indicator light; the hollowing monitoring part 6 can be used to detect rock and soil hollowing problems in the anchor hole, which can be more convenient for targeted detection, and the detection is accurate and reliable. It can timely detect the separation between the mud and the anchor hole, and make risk response plans in time. Once hollowing occurs in the anchor hole, the distance between it and the slide column 603 increases, and the micro switch 604 will control the external indicator light to light up.

[0037] Example 2. On the basis of Example 1, 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 threadedly connected to the anchor rod; a socket is provided on the prestressed nut 702; the traction linkage wire 701 is located in the protective tube 204; the end of the traction linkage wire 701 is used to be inserted into the socket of the prestressed nut 702; the relaxation test device 7 also includes: a positioning bolt 703, the positioning bolt 703 is threadedly connected to the prestressed nut 702; the end of the positioning bolt 703 is used to squeeze and position the traction linkage wire 701, and the use of the relaxation test device 7 does not affect the normal grouting, and can be used to detect the loosening of the prestressed nut 702, to avoid the loosening of the prestressed nut 702 without being discovered, which affects the safety, and also affects The prestressed effect is especially suitable for use with prestressed anchor rods. Once the rock and soil are too loose, it is easy to cause the tightening force of the prestressed nut 702 on the anchor rod pad to decrease, because there is a clearance between the prestressed nut 702 and the anchor rod. Once the prestressed nut 702 is loose, the nut of the prestressed anchor rod will become loose, which will affect the structural stability, reduce the bearing capacity and increase the risk of safety accidents. At the same time, the positioning bolt 703 can be detected together with the pressure sensor 404. After the anchor rod is grouting, when the positioning bolt 703 becomes loose and shakes, the traction linkage wire 701 will be displaced 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 change can be detected by the pressure sensor 404, and prompts can be given in time to ensure comprehensive detection and avoid affecting the prestressed effect.

[0038] The working principle of this embodiment: First, after the anchor monitoring installation tube 101 is threadedly connected to the anchor rod and the anchor rod is inserted into the anchor hole, the anchor monitoring installation tube 101 can be pushed hard to move into the anchor hole, causing the hot melt extrusion device 5 to collide with the bottom of the hole, and the extrusion drives the moving tube 201 into place to retract. At this time, the slurry groove 2011 is misaligned with the front side of the anchor monitoring installation tube 101, and the mud cannot flow. However, as the rotating anchor rod retreats, the expansion of the expansion shell on the anchor rod is controlled. Because the slip of the expansion shell is a sliding expansion structure, one side of the slip of the expansion shell will protrude when the expansion shell is not expanded, and it will press the baffle 303, causing it to drive the sliding tube 301 to extend, blocking the slurry groove 2011. At this time, as the anchor rod drives the anchor monitoring installation tube 101 to retreat, the expansion shell can be controlled When the shell expands, it will also move outward and toward the side of the power ring 203, and no longer squeeze the baffle 303. After the baffle 303 is not squeezed, it can be retracted under the pull of the shell expansion spring 302, and no longer block the slurry groove 2011. At this time, as the anchor monitoring installation tube 101 retreats into place, the slurry groove 2011 gradually extends out under the pull of the tension spring 202. At this time, the slurry groove 2011 is aligned with the sliding tube 301 and is no longer blocked by the sliding tube 301 and the inner hole of the moving tube 201 in place. At this time, the power ring 203 also contacts the power plate 103, and its external series indicator light can light up to prompt that grouting work can be carried out, ensuring that grouting work can be carried out only after the anchor is in place and the shell expands. The melting connection ring 5011 ensures accurate detection. After the anchor rod is grouted and the mud solidifies, the electric heating ring 502 can be controlled to heat-melt the connection ring 5011, and the anti-drip sheet 503 can be used to receive the molten drips. When the mud is subsequently broken and compressed due to factors such as collapse inside the anchor hole, the detection displacement column 501 is squeezed and displaced. At this time, the hemispherical structure at the bottom of the detection displacement column 501 is no longer aligned with the detection column 405. At this time, the detection column 405 will be displaced, and the pressure acting on the pressure sensor 404 will change. The data can be displayed in real time through 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 slide 602 to stick to it. In the anchor hole, the inner wall of the anchor hole will squeeze the sliding column 603, and then the micro switch 604 will be pressed. Once a hollow appears in the subsequent anchor hole and the distance between it and the sliding column 603 increases, the micro switch 604 will control the external indicator light to light up. As the slurry solidifies, the moving tube 201 and the tension spring 202 will be fixed by the mud after solidification. A release agent can be applied to the outside of the protective tube 204, and the hexagonal column at the end of the protective tube 204 can be directly rotated with a wrench to disassemble it. At this time, the traction linkage wire 701 can be passed through the prestressed nut 702, and the positioning bolt 703 can be tightened for positioning. The traction linkage wire 701 can be slightly pulled to pull 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 keep squeezing the detection column 405. When the positioning bolt 703 becomes loose and shaken, the traction wire 701 will be displaced under the pressure of the pressure spring 402. At this time, the pulling force of the connecting rod 403 on the pressure spring 402 will change. The pressure change can be detected by the pressure sensor 404, and a prompt can be given in time.

[0039] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A monitoring device for anchor prestressing of an underground hydraulic support system, comprising a prestressing test piece (1), a grouting sealing piece (2) being slidably mounted on the prestressing test piece (1), and characterized in that: The grouting sealing member (2) is used to control grouting; an anchoring member (3) is slidably mounted on the prestressed test member (1); the prestressed test member (1) is used to measure whether the anchor rod is in place; A stress monitoring device (4) is installed on the grouting sealing member (2); the stress monitoring device (4) is used to monitor stress; a hot melt extrusion device (5) is installed on the grouting sealing member (2); the hot melt extrusion device (5) is used to extrude the stress monitoring device (4); The hot melt extrusion device (5) is equipped with a hollowing monitoring unit (6); A relaxation testing device (7) is installed on the stress monitoring device (4), and the relaxation testing device (7) is used to detect whether the prestressed test piece (1) is loose; The prestressed test piece (1) comprises: an anchor rod monitoring installation tube (101) and grouting holes (102); the anchor rod monitoring installation tube (101) is provided with a circle of grouting holes (102); and the anchor rod monitoring installation tube (101) is used for being threadedly connected to the anchor rod.

2. The device for monitoring anchor prestress for an underground hydraulic support system according to claim 1, characterized in that: The prestressed test piece (1) further comprises: a power connection plate (103); a circle of power connection plates (103) is fixedly installed inside the anchor rod monitoring installation tube (101); the power connection plate (103) is an elastic steel plate structure.

3. The monitoring device for anchor prestressing of an underground hydraulic support system according to claim 2, characterized in that: The grouting sealing member (2) comprises: a moving tube (201), a grouting groove (2011), a tension spring (202), an electric ring (203) and a protective tube (204); the moving tube (201) is slidably sleeved on the anchor rod monitoring installation tube (101); the moving tube (201) is provided with a grouting groove (2011); the inner diameter of the grouting groove (2011) is smaller than the inner diameter of the front end of the anchor rod monitoring installation tube (101); the moving tube (201) is sleeved with a tension spring (203) 202); the end of the tension spring (202) is connected to the in-place movable tube (201), and the other end of the tension spring (202) is connected to the anchor rod monitoring installation tube (101); a power ring (203) is fixedly sleeved on the in-place movable tube (201); a circle of the power plate (103) elastically fits the power ring (203); a circle of the power plate (103) and the power ring (203) are externally connected in series with a power supply and an indicator light; the tail of the in-place movable tube (201) is threadedly connected to a protective tube (204).

4. The monitoring device for anchor prestressing for an underground hydraulic support system according to claim 3, characterized in that: The anchoring member (3) comprises: a sliding cylinder (301), an expansion spring (302) and a baffle (303); the sliding cylinder (301) is slidably mounted on the front end of the anchor rod monitoring installation cylinder (101); the expansion spring (302) is fixedly mounted on the side of the sliding cylinder (301), and the expansion spring (302) is located inside the anchor rod monitoring installation cylinder (101); the end of the expansion spring (302) is connected to the inside of the anchor rod monitoring installation cylinder (101); a baffle (303) is fixedly mounted on the sliding cylinder (301); the baffle (303) is used to fit on the end of the expansion; the inner diameter of the sliding cylinder (301) is the same as the outer diameter of the positioning moving tube (201).

5. The monitoring device for anchor prestressing of an underground hydraulic support system according to claim 3, characterized in that: The stress monitoring device (4) comprises: a monitoring fixed ring (401), a pressure spring (402) and a connecting rod (403); the monitoring fixed ring (401) is fixedly installed on the inner side of the in-position movable tube (201); the pressure spring (402) is fixedly installed on the monitoring fixed ring (401); the pressure spring (402) is located on the inner side of the in-position movable 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 on the inner side of the in-position movable tube (201).

6. The monitoring device for anchor prestressing of an underground hydraulic support system according to claim 5, characterized in that: The stress monitoring device (4) further comprises: a pressure sensor (404) and a detection column (405); the pressure sensor (404) is slidably mounted on the in-position movable tube (201); the pressure sensor (404) is connected to the end of a pressure spring (402); a detection column (405) is slidably mounted on the inner side of the in-position movable 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.

7. The device for monitoring anchor prestress for an underground hydraulic support system according to claim 6, characterized in that: The hot melt extrusion device (5) comprises: 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 in-place 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 in-place moving tube (201); the end of the detection displacement column (501) is a hemispherical knot The structure is as follows: the detection displacement column (501) is aligned with the detection column (405); the electric heating ring (502) is sleeved on the front side of the in-place moving tube (201); the electric heating ring (502) is aligned with the connecting ring (5011); a circle of anti-drip sheet (503) is fixedly installed on the outside of the detection displacement column (501), and the circle of anti-drip sheet (503) is located below the connecting ring (5011); the electric heating ring (502) is used for hot-melting the connecting ring (5011).

8. The device for monitoring anchor prestress for an underground hydraulic support system according to claim 7, characterized in that: The hollowing monitoring unit (6) comprises: a monitoring connecting plate (601), a slide cylinder (602), a slide column (603) and a micro switch (604); the monitoring connecting plate (601) is fixedly mounted on the top of the detection displacement column (501); the slide cylinder (602) is fixedly mounted on the monitoring connecting plate (601); the slide column (603) is slidably mounted on the slide cylinder (602); the micro switch (604) is mounted on the monitoring connecting 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 connecting plate (601); and a power supply and an indicator light are connected in series to the outside of the micro switch (604).

9. The device for monitoring anchor prestress for an underground hydraulic support system according to claim 5, characterized in that: The relaxation test device (7) comprises: 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 for being threadedly connected to the anchor rod; a socket is provided on the prestressed nut (702); the traction linkage wire (701) is located in the protective tube (204); the end of the traction linkage wire (701) is used for being inserted into the socket of the prestressed nut (702).

10. The monitoring device for anchor prestressing of an underground hydraulic support system according to claim 9, characterized in that: The relaxation test device (7) further comprises: a positioning bolt (703), wherein the positioning bolt (703) is threadedly connected to the prestressed nut (702); and the end of the positioning bolt (703) is used for squeezing and positioning the traction linkage wire (701).

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