Geological radar detection water conservancy and hydropower tunnel backfill grouting quality operation platform

Abstract

The application discloses a geological radar detection water conservancy and hydropower tunnel backfill grouting quality operation platform and belongs to the technical field of geological detection. The operation platform comprises an operation frame, a central shaft arranged on the operation frame, an intermediate cylinder coaxially connected with the central shaft, a radar antenna arranged in the middle part of the intermediate cylinder, and a damping assembly connecting the central shaft to the operation frame. The outer side of the intermediate cylinder is coaxially provided with a protective cylinder. The protective cylinder comprises arc-shaped protective plates, flexible connecting belts, first outer rods, first inner rods, first damping springs and rotating rings. The arc-shaped protective plates are annularly and uniformly distributed on the outer side of the intermediate cylinder. The arc-shaped protective plates are connected in an integrated manner through the flexible connecting belts. The rotating rings are rotatably arranged on the outer side of the intermediate cylinder. The device can effectively protect the geological radar when the radar is smoothly detected, effectively avoids the radar jumping problem caused by interference, and enables the detection process to be smoothly performed.

Description

Technical Field

[0001] This invention belongs to the field of geological exploration technology, specifically relating to a geological radar detection platform for the quality of backfill grouting in water conservancy and hydropower tunnels. Background Technology

[0002] In the construction of high-pressure concrete-lined tunnels, the backfill grouting between the lining concrete and the surrounding rock has a significant impact on the tunnel's serviceability and durability. The quality of the grouting directly determines the stress stability of the lining structure and the presence of leakage. Current methods for detecting backfill grouting involve using ground-penetrating radar (GPR) to pinpoint the location and size of any incomplete grouting. To facilitate tunnel wall detection, workers typically mount GPR on a mobile trolley, keeping it close to the detection area while the trolley moves, allowing detection and movement to occur simultaneously. However, tunnel walls are prone to retaining concrete residue. When the GPR detects this residue, interference can occur, causing fluctuations in the detection results and significantly affecting subsequent detection curves, thus severely hindering the smooth progress of tunnel exploration. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a ground-penetrating radar (GPR) platform for detecting the quality of backfill grouting in water conservancy and hydropower tunnels. This platform can effectively protect the GPR during successful radar detection, effectively avoid radar fluctuations caused by interference, and ensure that the detection process can proceed smoothly.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention discloses a ground-penetrating radar (GPR) platform for detecting the quality of backfill grouting in hydropower tunnels. The platform includes a working frame, a central shaft mounted on the working frame, an intermediate cylinder coaxially connected to the central shaft, and a radar antenna located in the center of the intermediate cylinder. The central shaft is connected to the working frame via a shock-absorbing assembly. A protective cylinder is coaxially mounted on the outer side of the intermediate cylinder. The protective cylinder includes an arc-shaped protective plate, a flexible connecting strip, a first outer rod, a first inner rod, a first damping spring, and a rotating ring. Several arc-shaped protective plates are evenly distributed in a ring on the outer side of the intermediate cylinder, and the arc-shaped protective plates are connected as a single unit by the flexible connecting strip. The radial distance of the arc-shaped protective plate from the central shaft is greater than the radial distance of the radar antenna from the central shaft. One end of the first outer rod is fixedly connected to the inner wall of the arc-shaped protective plate, and the other end of the first outer rod is slidably engaged with one end of the first inner rod. A first damping spring is provided between the first inner rod and the first outer rod. The other end of the first inner rod is fixedly connected to the rotating ring, which is rotatably mounted on the outer side of the intermediate cylinder.

[0006] Furthermore, the shock absorption assembly includes a slider, a guide rod, an end plate, a damping spring, a sector gear, a first disturbance rod, and a second disturbance rod. The first disturbance rod and the second disturbance rod are symmetrically arranged on both sides of the central axis. The lower ends of the first disturbance rod and the second disturbance rod are fixedly connected to the sector gear. The center of the sector gear is rotatably connected to the working frame. The upper side of the slider is provided with a rack that meshes with the sector gear. The middle part of the slider is slidably connected to the working frame. The lower end of the slider is fixedly connected to the guide rod. A damping spring is connected between the guide rod and the working frame.

[0007] Furthermore, both the first and second disturbance rods have through holes, and a connecting rod passes through the through holes. Limiting nuts are connected to both ends of the connecting rod, and a compression spring is sleeved on the outside of the connecting rod. The two ends of the compression spring are respectively connected to the first and second disturbance rods.

[0008] Furthermore, a sliding sleeve is fixedly installed on the work frame, and the slider is slidably disposed within the sliding sleeve.

[0009] Furthermore, the central shaft is a hollow shaft, and a channel for the passage of a cable for the radar antenna is formed at the center of the central shaft, with the cable exiting from one end of the central shaft.

[0010] Furthermore, a first gear is coaxially connected to the outer side of the intermediate cylinder. The tip circle diameter of the first gear is smaller than the diameter of the protective cylinder. The first gear meshes with a second gear, which is driven to rotate by a rotation drive device.

[0011] Furthermore, the center of the second gear is connected to a drive shaft, which is connected to a bearing seat on the work frame. The drive shaft is also connected to a first pulley, which is connected to a second pulley via a belt. The second pulley is connected to the output end of the motor, which is fixed on the work frame.

[0012] Furthermore, the working frame is fixedly connected to one end of the second inner rod, the other end of the second inner rod is slidably disposed at one end of the second outer rod, the other end of the second outer rod is hinged to the base plate, a second damping spring is connected between the first inner rod and the second outer rod, and a telescopic device is also connected between the second outer rod and the base plate, through which the swing angle of the second outer rod can be controlled.

[0013] The beneficial effects of this invention are as follows:

[0014] This invention relates to a ground-penetrating radar (GPR) platform for detecting the quality of backfill grouting in water conservancy and hydropower tunnels. By setting up an intermediate cylinder and a protective cylinder, the radar antenna does not need to directly contact the tunnel roof to be detected. Through the protective effect of the protective cylinder, the GPR can be effectively protected during radar detection, effectively avoiding radar fluctuation problems caused by interference, and ensuring that the detection process can proceed smoothly.

[0015] In the device of the present invention, by setting the protective cylinder into a cylindrical shape, the contact mode between its surface and the tunnel roof can be changed to rolling friction, which can reduce the damage to the protective cylinder. Moreover, the rolling mode makes it easier to cross concrete protrusion obstacles, thus providing better protection for the device.

[0016] In the device of the present invention, the protective cylinder specifically includes an arc-shaped protective plate and a flexible connecting belt. The arc-shaped protective plates are connected as a whole by the flexible connecting belt. When the protective cylinder encounters an obstacle, a single arc-shaped protective plate can move a certain distance radially under the action of concentrated stress to make way. At this time, the single arc-shaped protective plate can drive the first outer rod to move to compress the first damping spring. The first damping spring acts to dampen and dissipate energy, thereby reducing the force transmission on the protective cylinder and ensuring that the radar antenna can perform detection more stably.

[0017] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0018] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0019] Figure 1 This is a schematic diagram of the structure of the device of the present invention;

[0020] Figure 2 This is a side view of the device of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the first disturbance rod;

[0022] Figure 4 This is a schematic diagram of the protective cylinder.

[0023] Figure 5 This is a schematic diagram showing the connection between the first inner rod and the first outer rod.

[0024] Figure 6 This is a schematic diagram showing the connection between the second inner rod and the second outer rod.

[0025] The components in the attached diagram are labeled as follows: 1. Working frame; 2. Central shaft; 3. Intermediate cylinder; 4. Radar antenna; 5. Shock absorption assembly; 6. Protective cylinder; 7. Arc-shaped protective plate; 8. Flexible connecting belt; 9. First outer rod; 10. First inner rod; 11. First damping spring; 12. Rotating ring; 13. Sliding block; 14. Guide rod; 15. End plate; 16. Damping tension spring; 17. Sector gear; 18. First disturbance rod; 19. Second disturbance rod; 20. Rack; 21. Through hole; 22. Connecting rod; 23. Limit nut; 24. Compression spring; 25. Sliding sleeve; 26. Cable; 27. First gear; 28. Second gear; 29. ​​Drive shaft; 30. Bearing seat; 31. First pulley; 32. Belt; 33. Second pulley; 34. Motor; 35. Second inner rod; 36. Second outer rod; 37. Base plate; 38. Telescopic device; 39. Second damping spring. Detailed Implementation

[0026] like Figures 1-6 As shown, the present invention discloses a ground-penetrating radar (GPR) platform for detecting the quality of backfill grouting in water conservancy and hydropower tunnels. The platform includes a working frame 1, a central shaft 2 mounted on the working frame 1, an intermediate cylinder 3 coaxially connected to the central shaft 2, and a radar antenna 4 located in the middle of the intermediate cylinder 3. The working frame 1 serves as the overall support, with the tunnel's extension direction as the longitudinal direction. During operation, the central shaft 2 moves laterally, while the working frame 1 can move longitudinally. The central shaft 2 is connected to the working frame 1 via a shock-absorbing component 5. A protective cylinder 6 is coaxially mounted on the outer side of the intermediate cylinder 3. When the protective cylinder 6 encounters an obstacle while rolling, even if the force acts on the central shaft 2 through the intermediate cylinder 3, the shock-absorbing component 5 can partially absorb the vibration, reducing the impact of the vibration.

[0027] Specifically, there are two protective cylinders 6, identical in size, arranged axially along the intermediate cylinder 3. Each protective cylinder 6 includes an arc-shaped protective plate 7, a flexible connecting strip 8, a first outer rod 9, a first inner rod 10, a first damping spring 11, and a rotating ring 12. There are five arc-shaped protective plates 7, with gaps between adjacent plates to accommodate displacement and deformation. The flexible connecting strip 8, made of rubber, is fixedly connected to the arc-shaped protective plates 7, forming a cylindrical shape with the five plates connected together. Several arc-shaped protective plates 7 are evenly distributed in a ring on the outer side of the intermediate cylinder 3, connected as a single unit by the flexible connecting strip 8. The radial distance of each arc-shaped protective plate 7 from the central axis 2 is greater than the radial distance of the radar antenna 4 from the central axis 2, preventing the radar antenna 4 from protruding outwards and providing protection.

[0028] One end of the first outer rod 9 is fixedly connected to the inner wall of the arc-shaped protective plate 7. The other end of the first outer rod 9 is slidably engaged with one end of the first inner rod 10, that is, one end of the first inner rod 10 slides and extends within the first outer rod 9. A first damping spring 11 is provided between the first inner rod 10 and the first outer rod 9, which plays a role in shock absorption when relative displacement occurs between the first inner rod 10 and the first outer rod 9, and can elastically maintain the relative position between the first inner rod 10 and the first outer rod 9. The other end of the first inner rod 10 is fixedly connected to the rotating ring 12. The rotating ring 12 is rotatably disposed on the outside of the intermediate cylinder 3, which can adapt to the rolling of the protective cylinder 6. Limiting rings are provided on both sides of the rotating ring 12 to limit the axial movement of the rotating ring 12.

[0029] In this embodiment, the shock absorption assembly 5 includes a slider 13, a guide rod 14, an end plate 15, a damping spring 16, a sector gear 17, a first disturbance rod 18, and a second disturbance rod 19. The end plate 15 is fixed to the lower end of the guide rod 14 and is used to limit the damping spring 16. The slider is arranged vertically, and a sliding sleeve 25 is fixedly installed on the working frame 1. The slider is slidably installed in the sliding sleeve 25. The first disturbance rod 18 and the second disturbance rod 19 have identical structures and are symmetrically arranged on both sides of the central shaft 2. The first disturbance rod 18 and the second disturbance rod 19 are provided with arc grooves for engaging with the central shaft 2. The lower ends of the first disturbance rod 18 and the second disturbance rod 19 are fixedly connected to sector gears 17. The center of the sector gears 17 is rotatably connected to the working frame 1. The upper side of the slider is provided with a rack 20 that meshes with the sector gears 17. The middle part of the slider is slidably connected to the working frame 1. The lower end of the slider is fixedly connected to the guide rod 14. A damping spring 16 is connected between the guide rod 14 and the working frame 1. When the central shaft 2 is subjected to an external force, the central shaft 2 can act on the first disturbance rod 18 and the second disturbance rod 19 through the arc grooves and cause them to vibrate and deflect. When the first disturbance rod 18 and the second disturbance rod 19 deflect, they can drive the sector gears 17 to rotate. The sector gears 17 drive the slider to move up and down through the rack 20. After the slider moves up and down, it can act on the damping spring 16. In this way, when the protective cylinder 6 encounters an obstacle, the intermediate cylinder 3 acts on the central shaft 2, and the central shaft 2 is displaced by the external force. The shock absorption component 5 and the damping spring 16 can then reduce the vibration of the central cylinder, making the detection process of the radar antenna 4 smoother.

[0030] In this embodiment, both the first disturbance rod 18 and the second disturbance rod 19 are provided with through holes 21, and a connecting rod 22 is inserted through the through holes 21. The two ends of the connecting rod 22 are connected to limit nuts 23. By rotating the limit nuts 23, the tightness between the first disturbance rod 18 and the second disturbance rod 19 can be adjusted. A compression spring 24 is also sleeved on the outside of the connecting rod 22. The compression spring 24 is located between the first disturbance rod 18 and the second disturbance rod 19. The two ends of the compression spring 24 are respectively connected to the first disturbance rod 18 and the second disturbance rod 19 to provide elastic pre-support force, ensuring that the arc grooves on the first disturbance rod 18 and the second disturbance rod 19 are tightly fitted with the central shaft 2, and the transmission of action is more direct.

[0031] In this embodiment, the central shaft 2 is a hollow shaft, and the center of the central shaft 2 forms a channel for the cable 26 of the radar antenna 4 to pass through. The cable 26 passes out from one end of the central shaft 2, which can avoid the cable 26 from getting tangled and make the overall structure more compact.

[0032] In this embodiment, a first gear 27 is coaxially connected to the outer side of the intermediate cylinder 3. The tip circle diameter of the first gear 27 is smaller than the diameter of the protective cylinder 6. The first gear 27 meshes with a second gear 28, which is driven to rotate by a rotation drive device. The center of the second gear 28 is connected to a transmission shaft 29, which is connected to a bearing seat 30 on the working frame 1. The transmission shaft 29 is also connected to a first pulley 31, which is connected to a second pulley 33 via a belt 32. The second pulley 33 is connected to the output end of a motor 34, which is fixed on the working frame 1. Through the transmission action of the motor 34, the orientation angle of the intermediate cylinder 3 can be changed, allowing the detection angle of the radar antenna 4 to be adjusted to meet actual detection needs. The motor 34 is a stepper motor 34 with a brake. When the position of the radar antenna 4 is determined, the motor 34 stops. Through the meshing action of the second gear 28 and the first gear 27, the rotation of the central shaft 2 can be avoided, making the detection process more stable.

[0033] In this embodiment, the working frame 1 is fixedly connected to one end of the second inner rod 35, and the other end of the second inner rod 35 is slidably disposed at one end of the second outer rod 36. The other end of the second outer rod 36 is hinged to the base plate 37. A second damping spring 39 is connected between the first inner rod 10 and the second outer rod 36. A telescopic device 38 is also connected between the second outer rod 36 and the base plate 37. The telescopic device 38 can control the swing angle of the second outer rod 36, so that the whole device can deflect circumferentially along the tunnel top wall to adapt to the needs of different displacement detection. In this invention, the first damping spring 11 and the second damping spring 39 both adopt existing technology, which can play the role of elastic recovery and the properties of their own materials also have a certain energy dissipation effect. Those skilled in the art should understand that they can be selected in appropriate scenarios.

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A ground-penetrating radar platform for detecting the quality of backfill grouting in water conservancy and hydropower tunnels, characterized in that: The system includes a working frame, a central shaft mounted on the working frame, an intermediate cylinder coaxially connected to the central shaft, and a radar antenna located in the middle of the intermediate cylinder. The central shaft is connected to the working frame via a shock-absorbing assembly. A protective cylinder is coaxially mounted on the outer side of the intermediate cylinder. The protective cylinder includes arc-shaped protective plates, a flexible connecting strip, a first outer rod, a first inner rod, a first damping spring, and a rotating ring. Several arc-shaped protective plates are evenly distributed in a ring on the outer side of the intermediate cylinder, and the arc-shaped protective plates are connected as a single unit by the flexible connecting strip. The radial distance of each arc-shaped protective plate from the central shaft is greater than the radial distance of the radar antenna from the central shaft. One end of the first outer rod is fixedly connected to the inner wall of the arc-shaped protective plate, and the other end of the first outer rod is slidably engaged with one end of the first inner rod. A first damping spring is provided between the first inner rod and the first outer rod. The other end of the first inner rod is fixedly connected to the rotating ring, which is rotatably mounted on the outer side of the intermediate cylinder. The damping assembly includes a slider, a guide rod, an end plate, a damping spring, a sector gear, a first disturbance rod, and a second disturbance rod. The first and second disturbance rods are symmetrically arranged on both sides of the central axis. The lower ends of both the first and second disturbance rods are fixedly connected to a sector gear, the center of which is rotatably connected to the working frame. The upper side of the slider has a rack that meshes with the sector gear. The middle part of the slider is slidably connected to the working frame. The lower end of the slider is fixedly connected to the guide rod. A damping spring connects the guide rod and the working frame. Both the first and second disturbance rods have through holes, through which a connecting rod passes. Limit nuts are connected to both ends of the connecting rod. A compression spring is also sleeved on the outside of the connecting rod, with both ends connected to the first and second disturbance rods respectively. A sliding sleeve is fixedly installed on the working frame, and the slider is slidably disposed within the sliding sleeve.

2. The ground-penetrating radar detection platform for backfill grouting quality in water conservancy and hydropower tunnels according to claim 1, characterized in that: The central shaft is a hollow shaft, and a channel for the radar antenna cable to pass through is formed at the center of the central shaft, with the cable exiting from one end of the central shaft.

3. The ground-penetrating radar detection platform for backfill grouting quality in water conservancy and hydropower tunnels according to claim 1, characterized in that: A first gear is coaxially connected to the outer side of the intermediate cylinder. The tip circle diameter of the first gear is smaller than the diameter of the protective cylinder. The first gear meshes with a second gear, which is driven to rotate by a rotation drive device.

4. The ground-penetrating radar detection platform for backfill grouting quality in water conservancy and hydropower tunnels according to claim 3, characterized in that: The center of the second gear is connected to a drive shaft, which is connected to a bearing seat on the working frame. The drive shaft is also connected to a first pulley, which is connected to a second pulley via a belt. The second pulley is connected to the output end of the motor, which is fixed on the working frame.

5. A ground-penetrating radar platform for detecting the quality of backfill grouting in water conservancy and hydropower tunnels according to any one of claims 1-4, characterized in that: The working frame is fixedly connected to one end of the second inner rod, the other end of the second inner rod is slidably disposed at one end of the second outer rod, the other end of the second outer rod is hinged to the base plate, a second damping spring is connected between the first inner rod and the second outer rod, and a telescopic device is also connected between the second outer rod and the base plate, through which the swing angle of the second outer rod can be controlled.

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