A device for measuring the height of rock mass crack propagation in an underground chamber

Abstract

The application provides a kind of underground chamber rock mass crack propagation height measuring equipment.It includes placing rack, the top of the placing rack is fixedly connected with positioning cylinder, the top of the placing rack is fixedly connected with hand winding reel, the outer wall of the hand winding reel is sleeved with steel wire rope, one end of the steel wire rope is fixedly connected with the upper one of two sealing plates, the upper and lower sealing plates are fixedly connected through support, the top of the placing rack is fixedly connected with water pump, the water suction end of the water pump is fixedly connected with water suction pipe, the drain pipe of the water pump is fixedly connected with liquid discharge pipe, one end of the liquid discharge pipe penetrates sealing plate and extends to outside, the sealing plate is provided with propulsion mechanism, the propulsion mechanism is fixed with isolation mechanism, the upper and lower sealing plates are fixed with measuring mechanism, the inner wall of the positioning cylinder is provided with positioning mechanism.The application provides support for the hole of hole, prevents the hole from collapsing due to operation or other external force.

Description

Technical Field

[0001] This invention belongs to the field of rock mass crack measurement technology, and particularly relates to a device for measuring the crack propagation height in underground caverns. Background Technology

[0002] During the construction and operation of underground chambers (such as mines, tunnels, or underground storage facilities), the formation and propagation of rock mass cracks are important factors affecting structural safety and stability. Therefore, accurate monitoring and assessment of the propagation of rock mass cracks, especially changes in their height, are crucial to ensuring the safety of these underground spaces.

[0003] In the existing technology (CN118816731A, entitled "A Measuring Device for the Propagation Height of Rock Cracks in an Underground Chamber"), two sets of metal circular plates are placed inside the borehole using steel wire ropes. A vacuum pump pressurizes the two sets of metal circular plates through a switching valve. The pressure compresses the rock-adhering membrane on the metal circular plates, causing it to expand and adhere tightly to the rock wall, forming two completely sealed pressure chambers. A cavity is then formed between the two sets of metal circular plates. Subsequently, a liquid storage tank injects water containing fluorescent agent into the cavity through a second compressed air pipe. The switching valve is then switched to pressurize the vacuum pump, which pressurizes the cavity through the second compressed air pipe. A rotating camera, inserted deep into the chamber, detects fluorescent liquid dripping into the chamber, indicating the presence of a water-conducting fracture. The height of the water-conducting fracture zone is determined by the up-and-down movement of the steel wire rope. During the implementation of this technical solution, at least the following problems were found in the existing technology.

[0004] During operation, improper operation or other external forces may cause the borehole opening to collapse, resulting in irreversible damage to the equipment. When traditional measuring equipment is moved or its position adjusted, it often causes additional damage to the borehole wall. This damage not only affects the structural integrity of the borehole wall but may also change the original stress state, thereby interfering with the natural process of crack propagation. Especially when using high-definition probes for crack imaging, falling rock fragments may directly impact the probe, causing equipment damage. Summary of the Invention

[0005] This application aims to at least address one of the technical problems in the prior art where improper operation or other external forces cause damage to the borehole wall and high-definition probe. To this end, the present invention proposes a device for measuring the crack propagation height in underground tunnel rock masses.

[0006] To achieve the above objectives, the specific technical solution of the present invention is as follows: A device for measuring the crack propagation height in underground tunnel rock mass includes a placement frame, a positioning cylinder fixedly connected to the top of the placement frame, a hand-cranked winding reel fixedly connected to the top of the placement frame, a steel wire rope sleeved on the outer wall of the hand-cranked winding reel, one end of the steel wire rope being fixedly connected to the upper sealing plate of two sealing plates, the upper and lower sealing plates being fixedly connected at intervals by a bracket, a water pump fixedly connected to the top of the placement frame, a suction pipe fixedly connected to the suction end of the water pump, a drain pipe fixedly connected to the drain pipe of the water pump, one end of the drain pipe penetrating the sealing plate and extending to the outside, a propulsion mechanism being provided on the sealing plate, a sealing mechanism being fixedly fixed on the propulsion mechanism, a measuring mechanism being fixed between the upper and lower sealing plates, and a positioning mechanism being provided on the inner wall of the positioning cylinder.

[0007] Preferably, the positioning mechanism includes an annular convex guide rail fixedly connected to the inner wall of the positioning cylinder, a rotating disk slidably connected to the outer wall of the annular convex guide rail, an arc-shaped groove on the top of the rotating disk, a sliding rod slidably connected to the inner wall of the arc-shaped groove, a positioning rod fixedly connected to the bottom of the sliding rod, the positioning rod penetrating the inner wall of the positioning cylinder and extending to the outer side, and an arc-shaped positioning plate fixedly connected to the end of the positioning rod away from the sliding rod.

[0008] Preferably, an L-shaped connecting rod is fixedly connected to the top of the rotating disk, a reset cavity is opened inside the L-shaped connecting rod, a reset spring is fixedly connected to the inner wall of the reset cavity, a pressing plate is fixedly connected to the bottom end of the reset spring, a locking pin is fixedly connected to the bottom of the pressing plate, a limit groove is opened on the outer wall of the positioning cylinder, and a plurality of limiting holes are opened on the inner wall of the limit groove.

[0009] Preferably, the propulsion mechanism includes a fixed circular plate fixedly connected to the side wall of the sealing plate, a connecting spring fixedly connected to the inner wall of the fixed circular plate, and a lower pressure plate fixedly connected to the end of the connecting spring away from the fixed circular plate.

[0010] Preferably, a push plate is rotatably connected to the side wall of the lower pressure plate, and a T-shaped push rod is rotatably connected to the end of the push plate away from the lower pressure plate. One end of the T-shaped push rod passes through the inner wall of the fixed circular plate and extends to the outer side, and a caster is fixedly connected to the end of the T-shaped push rod away from the push plate.

[0011] Preferably, the sealing mechanism includes a first cylinder fixedly connected to the inner wall of the fixed circular plate, a lifting plate fixedly connected to the output end of the first cylinder, a lifting connecting rod fixedly connected to the side wall of the lifting plate, the end of the lifting connecting rod away from the lifting plate passing through the side wall of the sealing plate and extending to the inner side, and a pressing plate fixedly connected to the end of the lifting connecting rod away from the lifting plate.

[0012] Preferably, the sealing plate has a hydraulic chamber inside, the side wall of the extrusion plate is slidably connected to the inner wall of the hydraulic chamber, the inner wall of the hydraulic chamber has a drain hole, and a rubber sealing airbag is fixedly connected to the inner wall of the sealing plate.

[0013] Preferably, the outer wall of the sealing plate is provided with a measuring mechanism. The measuring mechanism includes a fixed frame fixedly connected to the outer wall of the sealing plate. A servo motor is fixedly connected to the side wall of the fixed frame. A driving bevel gear is fixedly connected to the output end of the servo motor. A driven bevel gear is meshed with the side wall of the driving bevel gear. A drive shaft is fixedly connected to the bottom of the driven bevel gear. A retaining ring is fixedly connected to the end of the drive shaft away from the driven bevel gear.

[0014] Preferably, a waterproof cylinder is fixedly connected to the inner wall of the fixing ring, a high-definition probe is fixedly connected to the inner wall of the waterproof cylinder, and a pressure sensor is fixedly connected to the side wall of the fixing frame.

[0015] Preferably, a second cylinder is fixedly connected to the outer wall of the fixing ring, a connecting bracket is fixedly connected to the output end of the second cylinder, a guide groove plate is fixedly connected to the side wall of the connecting bracket, an I-shaped guide rail is fixedly connected to the end of the waterproof cylinder, a semi-circular sealing disc is slidably connected to the side wall of the I-shaped guide rail, a guide rod is fixedly connected to the side wall of the semi-circular sealing disc, and the outer wall of the guide rod is slidably connected to the inner wall of the guide groove plate.

[0016] The present invention has the following advantages over the prior art: This invention relates to an underground tunnel rock mass crack propagation height measuring device. As the L-shaped connecting rod moves, it drives the rotating disk to rotate. The arc-shaped groove on the rotating disk guides the sliding rod, ensuring that the sliding rod moves along a predetermined trajectory. The sliding rod drives the positioning rod and the arc-shaped positioning plate to provide support for the opening of the hole, preventing the opening from collapsing due to operation or other external forces. This provides a stable working environment for subsequent crack propagation height measurement. In addition, due to the adjustable design of the positioning mechanism, it adapts to the needs of holes of different sizes and shapes, increasing the versatility and flexibility of the device.

[0017] This invention relates to a device for measuring the crack propagation height in underground tunnel rock masses. A hand-cranked reel lowers a sealing plate to a designated position. During lowering, a connecting spring pulls a lower pressure plate, which, through a push plate, pushes a T-shaped push rod and casters outwards. As the T-shaped push rod pushes, the casters gradually approach the borehole wall until they are in close contact, keeping the sealing plate centered in the borehole. This ensures the sealing plate does not directly touch the borehole wall during lowering, protecting it from damage and preventing additional damage to the borehole wall, thus ensuring the accuracy of subsequent measurements.

[0018] This invention relates to an underground tunnel rock mass crack propagation height measurement device. When the sealing plate is lowered to a predetermined position, a first cylinder drives a lifting plate to retract. The lifting plate then drives a lifting connecting rod and a squeezing plate. The squeezing plate applies pressure to the hydraulic chamber, forcing the liquid inside to drain through the drain hole and flow to the rubber sealing airbag. The expanded rubber sealing airbag makes tight contact with the borehole wall, forming an effective sealing area. This sealing area can serve as a fracturing test section, isolating the test area from other parts and ensuring the accuracy and effectiveness of the experiment. The rubber sealing airbag effectively prevents rock fragments that may fall during the testing process from directly impacting the high-definition probe, thereby avoiding equipment damage and ensuring the quality of data acquisition.

[0019] The underground tunnel rock mass crack propagation height measuring device of this invention requires, after completing the hydraulic fracturing test, first draining the water from the test section to provide a dry working environment for subsequent operations. A second cylinder drives the connecting bracket and guide plate to move towards the fixed ring. The guide rod slides along a specific path on the guide plate, causing the semi-circular sealing disc to move outward, thus exposing the high-definition probe. The high-definition probe then begins to accurately measure the cracks in the borehole wall. After the crack measurement is completed, the second cylinder is reversed, causing the connecting bracket and guide plate to retract to their initial position. The semi-circular sealing disc closes, sealing the port of the waterproof cylinder and protecting the high-definition probe from external environmental influences such as moisture, dust, and other possible physical damage. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the sealing plate structure of the present invention; Figure 3 This is a schematic diagram of the positioning mechanism structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the rotating disk structure of the present invention; Figure 6 This is a schematic diagram of the rubber sealing airbag structure of the present invention; Figure 7 This is a schematic diagram of the propulsion mechanism of the present invention; Figure 8This is a cross-sectional view of the sealing mechanism structure of the present invention; Figure 9 This is a schematic diagram of the high-definition probe structure of the present invention; Figure 10 This is a schematic diagram of the measuring mechanism structure of the present invention; Figure 11 This is a schematic diagram of the semi-circular sealing disc structure of the present invention; Figure 12 This is a schematic diagram of the cleaning mechanism structure of the present invention.

[0022] In the diagram: 101. Placement rack; 102. Positioning cylinder; 103. Hand-cranked winding reel; 104. Steel wire rope; 111. Sealing plate; 112. Drain pipe; 113. Water pump; 114. Suction pipe; 2. Positioning mechanism; 201. Annular convex guide rail; 202. Rotary disc; 203. Arc groove; 204. Slide rod; 205. Positioning rod; 206. Arc positioning plate; 21. L-shaped connecting rod; 22. Reset cavity; 23. Reset spring; 24. Pressing plate; 25. Locking post; 26. Limiting slot; 27. Limiting hole; 3. Pushing mechanism; 301. Fixed circular plate; 302. Connecting spring; 303. Lower pressure plate; 304. Push plate; 305. T-shaped push rod; 306. Caster; 4. Sealing mechanism; 401 402. First cylinder; 403. Lifting plate; 404. Lifting connecting rod; 405. Extrusion plate; 406. Hydraulic chamber; 407. Drain hole; 408. Rubber sealing airbag; 5. Measuring mechanism; 501. Fixing frame; 502. Servo motor; 503. Driving bevel gear; 504. Driven bevel gear; 505. Drive shaft; 506. Fixing ring; 507. Waterproof cylinder; 508. High-definition probe; 509. Pressure sensor; 51. Second cylinder; 52. Connecting bracket; 53. Guide groove plate; 54. I-shaped guide rail; 55. Semi-circular sealing disc; 56. Guide rod; 6. Cleaning mechanism; 601. Connecting frame; 602. Air jet; 603. Air jet pipe; 604. Extrusion round plate; 605. L-shaped extrusion rod. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1 to 11As shown, an underground tunnel rock mass crack propagation height measuring device of the present invention includes a placement frame 101. A positioning cylinder 102 is fixedly connected to the top of the placement frame 101. The positioning cylinder 102 can be inserted into the rock borehole as the basic support point for the entire device. A hand-cranked winding reel 103 is fixedly connected to the top of the placement frame 101. A steel wire rope 104 is sleeved on the outer wall of the hand-cranked winding reel 103. One end of the steel wire rope 104 is fixedly connected to the upper sealing plate 111 of two sealing plates 111 connected by a bracket. The two sealing plates 111 are parallel to each other. This arrangement is for rotating the hand-cranked winding reel 103 to lower the sealing plate 111 to a designated position. The device also includes: Positioning mechanism 2 includes an annular convex guide rail 201 fixedly connected to the inner wall of positioning cylinder 102. A rotating disk 202 is slidably connected to the outer wall of the annular convex guide rail 201. An arc-shaped groove 203 is formed at the top of the rotating disk 202. A slide rod 204 is slidably connected to the inner wall of the arc-shaped groove 203. A positioning rod 205 is fixedly connected to the bottom of the slide rod 204. The positioning rod 205 penetrates the inner wall of positioning cylinder 102 and extends to the outer side. An arc-shaped positioning plate 206 is fixedly connected to the end of the positioning rod 205 away from the slide rod 204. This arrangement is designed so that the arc groove 203 on the rotating disk 202 guides the slide rod 204, ensuring that the slide rod 204 moves along a predetermined trajectory. The slide rod 204 drives the positioning rod 205 and the arc positioning plate 206 to provide support for the opening of the hole. The positioning rod 205 passes through the inner wall of the positioning cylinder 102 and extends to the outside, with its end fixed to the arc positioning plate 206. When the rotating disk 202 rotates, its arc groove 203 guides the slide rod 204 to move along the predetermined trajectory, thereby driving the positioning rod 205 and the arc positioning plate 206 to support the inner wall of the hole.

[0025] An L-shaped connecting rod 21 is fixedly connected to the top of the rotating disk 202. A reset cavity 22 is opened inside the L-shaped connecting rod 21. A reset spring 23 is fixedly connected to the inner wall of the reset cavity 22. A pressing plate 24 is fixedly connected to the bottom end of the reset spring 23. A locking pin 25 is fixedly connected to the bottom of the pressing plate 24. A limit groove 26 is opened on the outer wall of the positioning cylinder 102. Several limiting holes 27 are opened on the inner wall of the limit groove 26. With this setting, the L-shaped connecting rod 21 can be held by hand and the pressing plate 24 can be pressed to make the locking pin 25 on the pressing plate 24 move away from the limiting holes 27, thereby releasing the L-shaped connecting rod 21 and allowing it to slide in the limit groove 26.

[0026] A water pump 113 is fixedly connected to the top of the placement rack 101. A water suction pipe 114 is fixedly connected to the suction end of the water pump 113. A drain pipe 112 is fixedly connected to the drain pipe of the water pump 113. One end of the drain pipe 112 passes through the sealing plate 111 and extends to the outside.

[0027] The side wall of the sealing plate 111 is provided with a pushing mechanism 3. The pushing mechanism 3 includes a fixed circular plate 301 fixedly connected to the side wall of the sealing plate 111. A connecting spring 302 is fixedly connected to the inner wall of the fixed circular plate 301. A lower pressure plate 303 is fixedly connected to the end of the connecting spring 302 away from the fixed circular plate 301. A push plate 304 is rotatably connected to the side wall of the lower pressure plate 303. A T-shaped push rod 305 is rotatably connected to the end of the push plate 304 away from the lower pressure plate 303. One end of the T-shaped push rod 305 passes through the inner wall of the fixed circular plate 301 and extends to the outside. A caster 306 is fixedly connected to the end of the T-shaped push rod 305 away from the push plate 304. This arrangement is for the connecting spring 302 to pull the lower pressure plate 303 to move. The lower pressure plate 303 pushes the T-shaped push rod 305 and the caster 306 outward through the push plate 304. As the T-shaped push rod 305 is pushed, the caster 306 gradually approaches the borehole wall. When the caster 306 is inside the positioning cylinder 102, the positioning cylinder 102 restricts the caster 306 to retract inside the positioning cylinder 102, at which time the spring is in a stretched state; after the sealing plate 111 is lowered and released from the restriction of the positioning cylinder 102, the spring returns to its natural extended state, driving the caster 306 to extend outward and abut against the inner wall of the borehole.

[0028] A sealing mechanism 4 is provided on the inner wall of the fixed circular plate 301. The sealing mechanism 4 includes a first cylinder 401 fixedly connected to the inner wall of the fixed circular plate 301. A lifting plate 402 is fixedly connected to the output end of the first cylinder 401. A lifting connecting rod 403 is fixedly connected to the side wall of the lifting plate 402. The end of the lifting connecting rod 403 away from the lifting plate 402 passes through the side wall of the sealing plate 111 and extends to the inner side. A pressing plate 404 is fixedly connected to the end of the lifting connecting rod 403 away from the lifting plate 402. The sealing plate 111 has an opening inside. The hydraulic chamber 405 has a side wall that is slidably connected to the inner wall of the extrusion plate 404. The inner wall of the hydraulic chamber 405 has a drain hole 406. The inner wall of the sealing plate 111 is fixedly connected to a rubber sealing airbag 407. This arrangement is for the first cylinder 401 to drive the lifting plate 402 to retract, the lifting plate 402 to drive the lifting connecting rod 403 and the extrusion plate 404, and the extrusion plate 404 to apply pressure to the hydraulic chamber 405. The liquid in the hydraulic chamber 405 is forced to be discharged through the drain hole 406 and flow to the rubber sealing airbag 407.

[0029] A measuring mechanism 5 is provided on the outer wall of the sealing plate 111. The measuring mechanism 5 includes a fixed frame 501 fixedly connected to the outer wall of the sealing plate 111. A servo motor 502 is fixedly connected to the side wall of the fixed frame 501. An active bevel gear 503 is fixedly connected to the output end of the servo motor 502. A driven bevel gear 504 is meshed with the side wall of the active bevel gear 503. A drive shaft 505 is fixedly connected to the bottom of the driven bevel gear 504. A fixed ring 506 is fixedly connected to the end of the drive shaft 505 away from the driven bevel gear 504. A waterproof cylinder 507 is fixedly connected to the inner wall of the fixed ring 506. A high-definition probe 508 is fixedly connected to the inner wall of the waterproof cylinder 507. This arrangement is so that the servo motor 502 drives the active bevel gear 503 and the driven bevel gear 504 to rotate, thereby causing the fixed ring 506 to drive the high-definition probe 508 to measure the crack. A pressure sensor 509 is fixedly connected to the side wall of the fixed frame 501. The pressure sensor 509 is used to collect pressure data.

[0030] A second cylinder 51 is fixedly connected to the outer wall of the fixed ring 506. A connecting bracket 52 is fixedly connected to the output end of the second cylinder 51. A guide groove plate 53 is fixedly connected to the side wall of the connecting bracket 52. An I-shaped guide rail 54 is fixedly connected to the end of the waterproof cylinder 507. A semi-circular sealing disc 55 is slidably connected to the side wall of the I-shaped guide rail 54. A guide rod 56 is fixedly connected to the side wall of the semi-circular sealing disc 55. The outer wall of the guide rod 56 is slidably connected to the inner wall of the guide groove plate 53. This arrangement is so that the second cylinder 51 drives the connecting bracket 52 and the guide groove plate 53 to move towards the fixed ring 506. The guide rod 56 slides along a specific path of the guide groove plate 53. The guide rod 56 will drive the semi-circular sealing disc 55 to move outward, thereby exposing the high-definition probe 508. Reverse operation of the second cylinder 51 closes the semi-circular sealing disc 55, protecting the high-definition probe 508 from the influence of the external environment.

[0031] like Figure 12As shown, the high-definition probe 508 is easily affected by external environmental factors such as moisture and dust. These factors may cause problems such as lens blurring and sensor malfunction, thus affecting the accuracy of the measurement results. However, in winter or cold environments, due to the large temperature difference between the deep hole and the ground surface, the temperature inside the hole will rise as the hole depth increases, causing the moisture in the air to liquefy on the outer wall of the lens. This causes the glass lens in the imaging area to fog up, making it impossible to clearly capture the image of the hole wall, resulting in poor imaging effect and making it impossible to identify the situation inside the hole. The outer wall of the waterproof cylinder 507 is provided with a cleaning mechanism 6. The cleaning mechanism 6 includes a connecting frame 601 fixedly connected to the outer wall of the waterproof cylinder 507. An air jet 602 is fixedly connected to the inner wall of the connecting frame 601. An air jet pipe 603 is connected to the outer surface of the air jet 602 and penetrates the outer wall of the waterproof cylinder 507 and extends into the inner wall. On the side, a compression disc 604 is slidably connected to the inner wall of the jet tube 602. An L-shaped compression rod 605 is fixedly connected to the side wall of the compression disc 604. The side wall of the L-shaped compression rod 605 is fixedly connected to the side wall of the connecting bracket 52. This arrangement is so that when the semi-circular sealing disc 55 is opened, the connecting bracket 52 drives the L-shaped compression rod 605 and the compression disc 604 to move. The compression disc 604 applies pressure to the gas inside the jet tube 602. The compressed gas is discharged through the jet pipe 603 connected to the jet tube 602 and directly enters the waterproof cylinder 507. The discharged gas blows towards the lens surface of the high-definition probe 508 at a certain speed and direction, effectively removing dust, water droplets or other impurities that may be attached to it, ensuring that the high-definition probe 508 is in the best working condition, extending the service life of the equipment, and improving the accuracy and reliability of data acquisition.

[0032] The working principle of this invention is as follows: A drilling device is used to drill the required holes in the rock mass for measurement. The positioning cylinder 102 of the device is inserted into the drill hole in the rock mass as the basic support point of the entire device. The operator can hold the L-shaped connecting rod 21 and press the pressing plate 24 to move the locking pin 25 on the pressing plate 24 away from the limiting hole 27, thereby releasing the L-shaped connecting rod 21 so that it can slide in the limiting groove 26. As the L-shaped connecting rod 21 moves, it drives the rotating disk 202 to rotate. The arc groove 203 on the rotating disk 202 guides the sliding rod 204 to ensure that the sliding rod 204 moves along the predetermined trajectory. The sliding rod 204 drives the positioning rod 205 and the arc positioning plate 206 (through the rotating diameter-changing tensioning mechanism) to provide support for the hole opening, preventing the hole opening from collapsing due to operation or other external forces, and providing a stable working environment for subsequent crack propagation height measurement. In addition, due to the adjustable design of the positioning mechanism 2, it can adapt to the needs of holes of different sizes and shapes, increasing the versatility and flexibility of the device.

[0033] Subsequently, the hand-cranked winding reel 103 is rotated to lower the sealing plate 111 to the designated position. During the lowering process, the connecting spring 302 pulls the lower pressure plate 303 to move. The lower pressure plate 303 pushes the T-shaped push rod 305 and the caster 306 outward through the push plate 304. As the T-shaped push rod 305 is pushed, the caster 306 gradually approaches the borehole wall until it is in close contact with the borehole wall, keeping the sealing plate 111 in the center of the borehole. This ensures that the sealing plate 111 will not directly touch the borehole wall during the lowering process, which not only protects the sealing plate 111 from damage but also avoids additional damage to the borehole wall, ensuring the accuracy of subsequent measurement work.

[0034] When the sealing plate 111 is lowered to the predetermined position, the first cylinder 401 drives the lifting plate 402 to retract. The lifting plate 402 drives the lifting connecting rod 403 and the pressing plate 404. The pressing plate 404 applies pressure to the hydraulic chamber 405. The liquid in the hydraulic chamber 405 (the hydraulic chamber 405 itself contains some liquid; the hydraulic chamber 405 is a closed cavity machined inside the sealing plate 111. The liquid in the hydraulic chamber 405 is pre-injected during the equipment manufacturing, assembly, or initial commissioning stage. Once injected and slidably sealed by the pressing plate 404, the cavity circulates normally during normal operation, i.e., the cylinder returns...) During compression, the liquid is considered a medium enclosed within the cavity, reciprocated under the action of the compression plate. It is forced out through the drain hole 406 and flows to the rubber sealing airbag 407. The inflated rubber sealing airbag 407 makes tight contact with the borehole wall, forming an effective sealing area. This sealing area can serve as the fracturing test section, isolating the test area from other parts and ensuring the accuracy and effectiveness of the experiment. The rubber sealing airbag 407 effectively prevents rock fragments that may fall during the testing process from directly impacting the high-definition probe 508, thereby avoiding equipment damage and ensuring the quality of data acquisition.

[0035] Water pump 113 is started, and water pump 113 injects water into the fracturing test section through drainage pipe 112. The water injection process needs to be carried out slowly to ensure that the development of the cracks and the response of the rock mass to pressure can be accurately observed. Pressure sensor 509 collects pressure data simultaneously and displays the fracturing curve in real time to help researchers understand the relationship between crack propagation and pressure changes. At the same time, during the process of injecting water into the cracks, the pressure of the water can make the cracks that were originally hidden or inconspicuous more obvious.

[0036] After the fracturing test is completed, the water in the test section needs to be drained to provide a dry working environment for subsequent operations. The second cylinder 51 drives the connecting bracket 52 and the guide groove plate 53 to move towards the fixing ring 506. The guide rod 56 slides along a specific path of the guide groove plate 53. The guide rod 56 will drive the semi-circular sealing plate 55 to move outward, thereby exposing the high-definition probe 508. The high-definition probe 508 begins to accurately measure the cracks in the borehole wall, including the length of the crack in the vertical direction (gravity direction). After the crack measurement is completed, the second cylinder 51 is reversed to return the connecting bracket 52 and the guide groove plate 53 to the initial position. The semi-circular sealing plate 55 closes, sealing the port of the waterproof cylinder 507 and protecting the high-definition probe 508 from the influence of the external environment, such as moisture, dust and other possible physical damage.

[0037] When the semi-circular sealing disc 55 is opened, the connecting bracket 52 drives the L-shaped extrusion rod 605 and the extrusion disc 604 to move. The extrusion disc 604 applies pressure to the gas inside the jet tube 602. The extruded gas is discharged through the jet pipe 603 connected to the jet tube 602 and directly enters the waterproof cylinder 507. The discharged gas blows towards the lens surface of the high-definition probe 508 at a certain speed and direction, effectively removing dust, water droplets or other impurities that may be attached to it, ensuring that the high-definition probe 508 is in the best working condition, extending the service life of the equipment, and improving the accuracy and reliability of data acquisition.

[0038] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention.

Claims

1. A device for measuring the crack propagation height in an underground tunnel, comprising a placement frame (101), a positioning cylinder (102) fixedly connected to the top of the placement frame (101), a hand-cranked winding reel (103) fixedly connected to the top of the placement frame (101), a steel wire rope (104) sleeved on the outer wall of the hand-cranked winding reel (103), one end of the steel wire rope (104) being fixedly connected to the upper sealing plate (111) of two sealing plates (111), the upper and lower sealing plates (111) being fixedly connected at intervals by a bracket, characterized in that, A water pump (113) is fixedly connected to the top of the placement rack (101). A water suction pipe (114) is fixedly connected to the suction end of the water pump (113). A drain pipe (112) is fixedly connected to the drain pipe of the water pump (113). One end of the drain pipe (112) passes through the sealing plate (111) and extends to the outside. A propulsion mechanism (3) is provided on the sealing plate (111). A sealing mechanism (4) is fixed on the propulsion mechanism (3). A measuring mechanism (5) is fixed between the upper and lower sealing plates (111). A positioning mechanism (2) is provided on the inner wall of the positioning cylinder (102). The positioning mechanism (2) includes an annular convex guide rail (201) fixedly connected to the inner wall of the positioning cylinder (102). A rotating disk (202) is slidably connected to the outer wall of the annular convex guide rail (201). An arc-shaped groove (203) is opened at the top of the rotating disk (202). A slide rod (204) is slidably connected to the inner wall of the arc-shaped groove (203). A positioning rod (205) is fixedly connected to the bottom of the slide rod (204). The positioning rod (205) penetrates the inner wall of the positioning cylinder (102) and extends to the outside. An arc-shaped positioning plate (206) is fixedly connected to the end of the positioning rod (205) away from the slide rod (204). An L-shaped connecting rod (21) is fixedly connected to the top of the rotating disk (202). A reset cavity (22) is provided inside the L-shaped connecting rod (21). A reset spring (23) is fixedly connected to the inner wall of the reset cavity (22). A pressing plate (24) is fixedly connected to the bottom end of the reset spring (23). A locking post (25) is fixedly connected to the bottom of the pressing plate (24). A limit slot (26) is provided on the outer wall of the positioning cylinder (102). A plurality of limiting holes (27) are provided on the inner wall of the limit slot (26). The propulsion mechanism (3) includes a fixed circular plate (301) fixedly connected to the side wall of the sealing plate (111), a connecting spring (302) fixedly connected to the inner wall of the fixed circular plate (301), and a lower pressure plate (303) fixedly connected to the end of the connecting spring (302) away from the fixed circular plate (301). A push plate (304) is rotatably connected to the side wall of the lower pressure plate (303). A T-shaped push rod (305) is rotatably connected to the end of the push plate (304) away from the lower pressure plate (303). One end of the T-shaped push rod (305) passes through the inner wall of the fixed circular plate (301) and extends to the outer side. A caster (306) is fixedly connected to the end of the T-shaped push rod (305) away from the push plate (304).

2. The device for measuring the crack propagation height in underground cavern rock mass according to claim 1, characterized in that: The inner wall of the fixed circular plate (301) is provided with a sealing mechanism (4). The sealing mechanism (4) includes a first cylinder (401) fixedly connected to the inner wall of the fixed circular plate (301). The output end of the first cylinder (401) is fixedly connected to a lifting plate (402). The side wall of the lifting plate (402) is fixedly connected to a lifting connecting rod (403). The end of the lifting connecting rod (403) away from the lifting plate (402) passes through the side wall of the sealing plate (111) and extends to the inner side. The end of the lifting connecting rod (403) away from the lifting plate (402) is fixedly connected to a pressing plate (404).

3. The device for measuring the crack propagation height in underground cavern rock mass according to claim 2, characterized in that: The sealing plate (111) has a hydraulic chamber (405) inside. The side wall of the extrusion plate (404) is slidably connected to the inner wall of the hydraulic chamber (405). The inner wall of the hydraulic chamber (405) has a drain hole (406). A rubber sealing airbag (407) is fixedly connected to the inner wall of the sealing plate (111).

4. The device for measuring the crack propagation height in underground cavern rock mass according to claim 1, characterized in that: The measuring mechanism (5) includes a fixed frame (501) fixedly connected to the outer wall of the sealing plate (111). A servo motor (502) is fixedly connected to the side wall of the fixed frame (501). An active bevel gear (503) is fixedly connected to the output end of the servo motor (502). A driven bevel gear (504) is meshed with the side wall of the active bevel gear (503). A drive shaft (505) is fixedly connected to the bottom of the driven bevel gear (504). A retaining ring (506) is fixedly connected to the end of the drive shaft (505) away from the driven bevel gear (504).

5. The device for measuring the crack propagation height in underground tunnel rock mass according to claim 4, characterized in that: A waterproof cylinder (507) is fixedly connected to the inner wall of the fixing ring (506), a high-definition probe (508) is fixedly connected to the inner wall of the waterproof cylinder (507), and a pressure sensor (509) is fixedly connected to the side wall of the fixing frame (501).

6. The device for measuring the crack propagation height in underground tunnel rock mass according to claim 5, characterized in that: The outer wall of the fixed ring (506) is fixedly connected to a second cylinder (51), the output end of the second cylinder (51) is fixedly connected to a connecting bracket (52), the side wall of the connecting bracket (52) is fixedly connected to a guide groove plate (53), the end of the waterproof cylinder (507) is fixedly connected to an I-shaped guide rail (54), the side wall of the I-shaped guide rail (54) is slidably connected to a semi-circular sealing disc (55), the side wall of the semi-circular sealing disc (55) is fixedly connected to a guide rod (56), and the outer wall of the guide rod (56) is slidably connected to the inner wall of the guide groove plate (53).

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