A device for detecting voids in tunnel lining by tapping

Abstract

This application relates to the technical field of tunnel engineering testing equipment, and in particular to a device for detecting voids in tunnel lining by impact. The device includes a handle, a connecting rod fixedly connected to the top of the handle, a sliding plate slidably connected to the outer wall of the connecting rod, a connecting cylinder fixedly connected to the top of the sliding plate, a limiting plate fixedly connected to the outer wall of the connecting rod, and a disc spring fixedly installed on the top of the limiting plate. The inner wall of the disc spring is sleeved with the outer wall of the connecting rod, and the top of the disc spring contacts the bottom of the sliding plate. This invention, through the synergistic effect of elastic buffering and damping limiting structures, can efficiently absorb longitudinal impact force when impacting the tunnel lining upwards for testing, significantly reducing the transmission of vibration to the user's hand, effectively reducing hand vibration, avoiding numbness and discomfort, improving grip comfort during long-term operation, and also reducing wear and tear on internal components due to vibration, improving the stability of the device during use, and extending its overall service life.

Description

Technical Field

[0001] This application relates to the technical field of tunnel engineering testing equipment, and in particular to a device for detecting voids in tunnel lining by tapping. Background Technology

[0002] Detection of voids in tunnel lining is a crucial step in ensuring the structural safety of tunnels. The percussion test method is widely used in on-site tunnel lining defect detection due to its simplicity and low cost. However, when inspecting the arch lining of a tunnel, operators must hold the testing device and strike upwards to complete the test. Most existing percussion test devices lack specific buffering and damping structures.

[0003] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: the longitudinal impact force generated by the upward thrust is directly transmitted to the operator's hand, which can easily cause numbness and discomfort in the hand, making it difficult to adapt to long-term continuous testing operations; at the same time, continuous longitudinal vibration can cause the internal connecting parts of the device to loosen and wear, reducing the stability of the device and shortening its overall service life. Summary of the Invention

[0004] To reduce the vibration experienced by operators' hands, this application provides a device for detecting voids in tunnel lining by tapping.

[0005] This application provides a tunnel lining void detection device, which adopts the following technical solution: it includes a handle, a connecting rod fixedly connected to the top of the handle, a sliding plate slidably connected to the outer wall of the connecting rod, and a connecting cylinder fixedly connected to the top of the sliding plate.

[0006] A limiting plate is fixedly connected to the outer wall of the connecting rod. A disc spring is fixedly installed on the top of the limiting plate. The inner wall of the disc spring is sleeved with the outer wall of the connecting rod. The top of the disc spring contacts the bottom of the sliding plate. A sliding block one is fixedly connected to the bottom of the sliding plate. A fixing box is slidably connected to the outer wall of the sliding block one. The bottom of the fixing box is fixedly connected to the top of the handle. A fixing rod is fixedly connected to the inner wall of the fixing box. A sliding block two is slidably connected to the outer wall of the fixing rod. A damping spring is fixedly connected to the back of the sliding block two. A slot is opened on the top of the sliding block two. A rotating plate is rotatably connected to the inner wall of the slot.

[0007] Optionally, a connecting frame is rotatably connected to the side of the outer wall of the rotating plate away from the slot, and the top of the connecting frame is fixedly connected to the bottom of the sliding block.

[0008] Optionally, the number of connecting frames is two, and the two rotating plates are arranged symmetrically.

[0009] Optionally, the outer wall of the second sliding block is slidably connected to the inner wall of the fixed box, and there are two second sliding blocks, which are symmetrically arranged.

[0010] Optionally, a rotating column is rotatably connected to the bottom of the inner wall of the connecting cylinder, and a rotating disk is fixedly connected to the top of the rotating column.

[0011] Optionally, the inner wall of the connecting cylinder is provided with a rotating groove, the inner wall of the rotating groove is rotatably connected to the outer wall of the rotating disk, and a threaded rod is fixedly connected to the top of the rotating disk.

[0012] Optionally, a telescopic column is slidably connected to the inner wall of the connecting cylinder, and a knocking detection head is fixedly installed on the top of the telescopic column.

[0013] Optionally, the telescopic column has a threaded hole at its bottom, and the inner wall of the threaded hole is threadedly connected to the outer wall of the threaded rod.

[0014] In summary, this application includes the following beneficial technical effects: 1. This invention utilizes the synergistic effect of elastic buffering and damping limiting structures to efficiently absorb longitudinal impact force when conducting impact testing on tunnel lining by puncturing upwards. This significantly reduces the transmission of vibration to the user's hand, effectively alleviating hand vibration, preventing numbness and discomfort, and improving grip comfort during long-term operation. At the same time, it also reduces the loosening and wear of internal components due to vibration, improves the stability of the device during use, and extends the overall service life.

[0015] 2. This invention adopts a threaded transmission and telescopic cooperation structure, which can quickly adjust the extension length of the telescopic column. It can adapt to tunnel lining inspection scenarios of different heights and positions without the need for tools. It can complete multi-area inspection operations without changing parts, simplifying the operation process, improving the flexibility and convenience of on-site inspection, and improving the efficiency of tunnel lining void detection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the fixing box in the embodiments of this application; Figure 3 This is a schematic diagram of the rotating plate in an embodiment of this application; Figure 4 This is a schematic diagram of the rotating disk in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the telescopic column in the embodiments of this application.

[0017] Reference numerals: 1. Handle; 11. Connecting rod; 12. Sliding plate; 13. Connecting cylinder; 2. Limiting plate; 21. Disc spring; 22. Fixing box; 221. Sliding block one; 23. Fixing rod; 231. Sliding block two; 24. Rotating plate; 241. Connecting frame; 25. Damping spring; 3. Rotating column; 31. Rotating disk; 32. Threaded rod; 33. Telescopic column; 331. Threaded hole; 34. Impact detection head. Detailed Implementation

[0018] The following is in conjunction with the appendix Figures 1-5 This application will be further described in detail below. The technical solutions in the embodiments of this application will be clearly described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] This application discloses a device for detecting voids in tunnel lining by tapping. For example... Figure 1 As shown, the main body includes a handle 1, with a connecting rod 11 fixedly connected to the top of the handle 1. The connecting rod 11 is a solid circular rod made of 45# steel or aluminum alloy with a smooth surface, serving as a vertical guide shaft. A sliding plate 12 is slidably mounted on the outer wall of the connecting rod 11. The sliding plate 12 has a through hole in its center, and the sliding gap between it and the connecting rod 11 is ≤0.2mm. A connecting cylinder 13 is fixedly connected to the top of the sliding plate 12. A limiting plate 2 is fixedly mounted on the outer wall of the connecting rod 11. The limiting plate 2 is a circular baffle with an outer diameter larger than that of the disc spring 21. The disc spring 21 is mounted on the top of the limiting plate 2. The disc spring 21 is a mating combination disc spring composed of stacked 65Mn spring steel discs, quenched and tempered at medium temperature, with a hardness of HRC42~48 and a compression stroke of 3~8mm. The inner wall of the disc spring 21 is sleeved on the outer wall of the connecting rod 11 with a clearance fit. The top of the disc spring 21 contacts the bottom of the sliding plate 12.

[0020] Please see Figure 2 , Figure 3The bottom of the sliding plate 12 is fixedly connected to a sliding block 221, which is a vertical rectangular slider made of POM (polyoxymethylene) or copper-based alloy, and is self-lubricating and wear-resistant. The outer wall of the sliding block 221 is slidably connected to a fixed box 22, which is a closed box with a vertical groove at the top and a dustproof sealing ring inside. The bottom of the fixed box 22 is fixedly connected to the top of the handle 1. The inner wall of the fixed box 22 is fixedly connected to a fixed rod 23, which is an optical axis guide rod made of 45# steel with a chrome-plated and polished surface. Both ends are interference-fitted and fastened to the fixed box 22. The outer wall of the fixed rod 23 is slidably connected to a sliding block 231, which is a horizontal slider. Two sets of sliding blocks 231 are symmetrically arranged, made of the same material as the sliding block 221, with a sliding gap ≤0.2mm. A damping spring 25 is fixedly connected to the back of sliding block 231. The damping spring 25 is a cylindrical compression helical spring made of 50CrVA spring steel with a galvanized anti-rust coating. The wire diameter is 1.2-2.0mm, the outer diameter is 8-12mm, the free length is 15-25mm, and the preload is 3-5mm. A slot is opened at the top of sliding block 231, and a rotating plate 24 is rotatably connected to the inner wall of the slot. A connecting frame 241 is rotatably connected to the side of the rotating plate 24 away from the slot. The top of the connecting frame 241 is fixedly connected to the bottom of sliding block 221. Both the rotating plate 24 and the connecting frame 241 adopt a symmetrical double-set structure. The diameter of the rotating connecting pin is 3-5mm to ensure the smoothness and balanced force of sliding and lifting.

[0021] Please see Figure 4 , Figure 5 A rotating column 3 is rotatably connected to the bottom of the inner wall of the connecting cylinder 13. The rotating column 3 rotates with a clearance fit to the bottom of the connecting cylinder 13. A rotating disk 31 is fixedly connected to the top of the rotating column 3. The outer wall of the rotating disk 31 is provided with knurled texture for easy manual rotation. A rotating groove is opened in the inner wall of the connecting cylinder 13. The inner wall of the rotating groove is rotatably connected to the outer wall of the rotating disk 31 to achieve axial limiting and circumferential rotation. A threaded rod 32 is fixedly connected to the top of the rotating disk 31. The threaded rod 32 adopts a common triangular thread with a nominal diameter of M8 to M12 and a pitch of 1.25 to 1.5 mm, and has thread self-locking property. The inner wall of the connecting cylinder 13 is slidably connected to the telescopic column 33, which is a cylindrical guide column with an adjustable stroke of 50-150mm. It can move up and down linearly along the connecting cylinder 13 without rotating. The top of the telescopic column 33 is equipped with a knocking detection head 34, which is detachable and made of 40Cr or bearing steel. It is hardened and provides clear and wear-resistant knocking signals. The bottom of the telescopic column 33 has a threaded hole 331. The inner wall of the threaded hole 331 is precisely threaded with the outer wall of the threaded rod 32. A damping washer or thread anti-loosening rubber can be added to prevent loosening after long-term use.

[0022] In use, the rotating disc 31 is rotated to drive the threaded rod 32 to rotate according to the detection height of the tunnel lining. The threaded transmission drives the telescopic column 33 to rise and fall within the connecting cylinder 13, completing the height adjustment of the striking head 34. This allows it to adapt to different heights and positions for different testing scenarios without the need for tools. When the handle 1 is used to strike the lining, the sliding plate 12 slides downward along the connecting rod 11 under the impact force, compressing the disc spring 21 to generate a primary elastic buffer, absorbing most of the longitudinal impact force. At the same time, the sliding block 221 drives the rotating plate 24 to rotate through the connecting frame 241, pushing the sliding block 231 to slide along the fixed rod 23. The damping spring 25 generates a secondary damping limit on the movement of the sliding block 231, absorbing residual vibration, limiting excessive displacement, and ensuring stable and uniform striking force.

[0023] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 After the tapping is completed, the disc spring 21 and the damping spring 25 synchronously and elastically reset, causing the sliding plate 12 and the tapping detection head 34 to return to their initial state, allowing for continuous tapping detection operations. The symmetrical rotating plate 24 and sliding block 231 structure effectively prevents wobbling and deviation during sliding. The sealed structure of the fixed box 22 prevents tunnel dust and moisture from entering and causing jamming. The key sliding friction pairs are made of wear-resistant materials, and the overall buffer structure significantly reduces the transmission of vibration to the hand, alleviating numbness and discomfort, while also reducing component loosening and wear, ensuring long-term stable use of the device.

[0024] The implementation principle of the tunnel lining void impact detection device in this application embodiment is as follows: Rotating the rotating disk 31 can drive the rotating column 3 and the threaded rod 32 to rotate synchronously. The threaded rod 32 and the threaded hole 331 at the bottom of the telescopic column 33 form a threaded transmission, driving the telescopic column 33 to move linearly up and down along the inner wall of the connecting cylinder 13, thereby changing the extension length of the impact detection head 34 to adapt to different detection heights. When the impact is upward, the impact reaction force pushes the sliding plate 12 to move down along the connecting rod 11, compressing the disc spring 21 to achieve primary elastic buffering. The sliding plate 12 drives the sliding block 221 to move down, and through the connecting frame 241, it pushes the rotating plate 24 to rotate, thereby pushing the sliding block 231 to slide along the fixed rod 23 and compress the damping spring 25 to form a secondary damping limit, which greatly absorbs the longitudinal impact force and reduces the hand vibration. After the external force disappears, the disc spring 21 and the damping spring 25 elastically reset, driving the sliding plate 12 and the impact detection head 34 back to their original positions, completing a single impact cycle.

[0025] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for detecting voids in tunnel lining by tapping, comprising a handle (1), characterized in that: The top of the handle (1) is fixedly connected to a connecting rod (11), the outer wall of the connecting rod (11) is slidably connected to a sliding plate (12), and the top of the sliding plate (12) is fixedly connected to a connecting cylinder (13). The outer wall of the connecting rod (11) is fixedly connected to the limiting plate (2), and the top of the limiting plate (2) is fixedly installed with a disc spring (21). The inner wall of the disc spring (21) is sleeved with the outer wall of the connecting rod (11). The top of the disc spring (21) is in contact with the bottom of the sliding plate (12). The bottom of the sliding plate (12) is fixedly connected with a sliding block one (221). The outer wall of the sliding block one (221) is slidably connected with a fixing box (22). The bottom of the fixing box (22) is fixedly connected with the top of the handle (1). The inner wall of the fixing box (22) is fixedly connected with a fixing rod (23). The outer wall of the fixing rod (23) is slidably connected with a sliding block two (231). The back of the sliding block two (231) is fixedly connected with a damping spring (25). The top of the sliding block two (231) has a slot. The inner wall of the slot is rotatably connected with a rotating plate (24).

2. The tunnel lining void detection device according to claim 1, characterized in that: The outer wall of the rotating plate (24) is rotatably connected to a connecting frame (241) on the side away from the slot. The top of the connecting frame (241) is fixedly connected to the bottom of the sliding block (221).

3. The tunnel lining void detection device according to claim 2, characterized in that: The number of connecting frames (241) is two, and the two rotating plates (24) are arranged symmetrically.

4. The tunnel lining void detection device according to claim 1, characterized in that: The outer wall of the sliding block 2 (231) is slidably connected to the inner wall of the fixed box (22). There are two sliding blocks 2 (231), and the two sliding blocks 2 (231) are symmetrically arranged.

5. The tunnel lining void detection device according to claim 1, characterized in that: The bottom of the inner wall of the connecting cylinder (13) is rotatably connected to a rotating column (3), and the top of the rotating column (3) is fixedly connected to a rotating disk (31).

6. The tunnel lining void detection device according to claim 5, characterized in that: The inner wall of the connecting cylinder (13) is provided with a rotating groove, the inner wall of the rotating groove is rotatably connected to the outer wall of the rotating disk (31), and a threaded rod (32) is fixedly connected to the top of the rotating disk (31).

7. The tunnel lining void detection device according to claim 6, characterized in that: The inner wall of the connecting cylinder (13) is slidably connected to a telescopic column (33), and a knocking detection head (34) is fixedly installed on the top of the telescopic column (33).

8. The tunnel lining void detection device according to claim 7, characterized in that: The telescopic column (33) has a threaded hole (331) at its bottom, and the inner wall of the threaded hole (331) is threadedly connected to the outer wall of the threaded rod (32).

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