Bridge pier underwater scouring state monitoring device
By designing a cutting blade and a linkage structure in the underwater scour monitoring device for bridge piers, the problem of interference from aquatic plants and debris during the sonar's descent was solved, achieving high-precision underwater scour monitoring of bridge piers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-21
- Publication Date
- 2026-04-14
AI Technical Summary
Existing underwater scour monitoring devices for bridge piers are easily interfered with by aquatic plants and debris during the sonar's descent, leading to distorted measurement data and lack of proactive protection.
An active platform with a cutting blade was designed to clear obstacles during the sonar descent via a linkage structure, and to automatically open the protective cover at a specific depth to ensure accurate exposure of the sonar while it is operating underwater.
Active clearing was achieved during the sonar's downward movement, ensuring the accuracy and reliability of measurement data, avoiding interference from obstacles such as aquatic plants, and improving the precision and safety of monitoring.
Smart Images
Figure CN121856975A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of underwater sonar ranging technology, specifically a device for monitoring the underwater scour status of bridge piers. Background Technology
[0002] As a core component of transportation infrastructure, the long-term safety and stability of bridges are directly related to public safety and economic operation. Bridge piers, as the supporting structure of bridges, are subject to environmental factors such as water flow and sediment over a long period of time. In particular, the underwater part is prone to local erosion of the riverbed due to the scouring of the water flow eddies, which can lead to instability of the bridge pier foundation, a decrease in the bridge's load-bearing capacity, or even collapse. Therefore, the development of efficient and reliable underwater scouring monitoring technology for bridge piers is of great engineering significance. At present, underwater scouring monitoring technology for bridge piers has gradually developed from traditional manual detection to electronic and automated monitoring.
[0003] Among them, intelligent sensing sonar ranging technology is widely used due to its advantages such as non-contact and high precision. In patent CN214502607U, a device for monitoring the underwater scour condition of bridge piers is disclosed. The device includes a monitoring system and auxiliary devices. The patent extends the sonar to a position close to the bottom of the water by installing a rod, uses sonar ranging to determine the scour condition under the bridge pier, and uses a slide rail and winch to realize the translation of the installation rod, so that one sonar can monitor multiple locations under the bridge pier, effectively reducing costs.
[0004] Although the patent has made progress in mobile monitoring and cost control, the following significant drawbacks have been found in practical applications: Although the protective cover is an open design, it cannot actively prevent aquatic plants and debris from entering the sonar working area when the sonar enters the underwater environment. During the descent of the sonar, although the appearance of the protective cover is made as smooth as possible, it is still easy for aquatic plants and other obstacles to be caught, interfering with the transmission and reception of sound waves and causing the measurement data to be distorted. To address these issues, we provide a bridge pier underwater scour status monitoring device to solve the problems mentioned above. Summary of the Invention
[0005] The purpose of this invention is to provide a device for monitoring the underwater scour status of bridge piers, so as to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: A device for monitoring the underwater scour status of bridge piers includes a support base fixed to the bridge pier, a guide bracket fixed to the bottom of the support base, a movable platform disposed below the guide bracket, a cylinder fixed on the support base, a piston rod disposed at the output end of the cylinder, the piston rod passing through the guide bracket and fixed to the movable platform, an intelligent sensing sonar for monitoring the underwater scour status fixed to the bottom of the movable platform, and multiple cutting blades rotatably mounted on the periphery of the movable platform. The cutting blades are connected to the movable platform through a first linkage structure, and the cutting blades rotate when the movable platform moves up and down. The bottom of the active platform is fixed with a protective cover with a bottom opening. A box cover is hinged to the bottom opening of the protective cover. The intelligent sonar is stored inside the protective cover when not in operation. A buckle is fixed on the box cover. A latch is slidably provided on the protective cover to engage with the buckle. The latch and the active platform are connected by a second linkage structure. When the active platform descends to a certain height at the bottom of the water, the latch can be driven to move and automatically release the buckle, so as to open the box cover and expose the intelligent sonar.
[0007] The underwater scour status monitoring device for bridge piers as described above: the support base has bolt mounting holes, and the support base is fixedly connected to the bridge pier by bolts.
[0008] The underwater scouring monitoring device for bridge piers described above includes a first linkage structure comprising a support base fixed on a movable platform and a fixed sleeve fixed on a guide bracket. A drive shaft rotatably mounted on the support base is movably inserted into the fixed sleeve. The bottom end of the drive shaft is fixed to a cutting blade. The drive shaft and the fixed sleeve are engaged by a grooving structure. The drive shaft rotates when it moves up and down within the fixed sleeve.
[0009] The underwater scour status monitoring device for bridge piers as described above: the groove structure includes a spiral groove formed on the surface of the drive shaft and balls embedded and engaged in the inner wall of the fixed sleeve. The balls are movably engaged in the spiral groove and can roll along the track of the spiral groove.
[0010] As described above, an underwater scour monitoring device for bridge piers includes a second linkage structure comprising a guide sleeve fixed to a protective cover, a top rod movably inserted into the guide sleeve, one end of the top rod being fixed to a locking pin, and the other end being fixed to a limiting block. A return spring sleeved on the top rod is connected between the limiting block and the guide sleeve. An elastic clearance component is provided on one side of the top rod, which is used to squeeze the top rod to push the locking pin to move and engage with the latch. The elastic clearance component cooperates with the movable platform. When the movable platform descends to a certain height, the elastic clearance component releases the squeezing of the top rod, and the return spring elastically resets, pushing the locking pin to move in the opposite direction and disengage from the latch.
[0011] A bridge pier underwater scour status monitoring device as described above: the elastic clearance component includes a swing arm hinged to a protective cover, a guide rod fixed on the support base, a sleeve through a guide bracket fixed on the movable platform, the guide rod movably inserted into the sleeve, a slider movably engaged inside the sleeve, a spring fixedly connected between the guide rod and the slider, a top column through the sleeve fixed at the bottom of the slider, a connecting rod between the top column and the swing arm, and the two ends of the connecting rod being hinged to the top column and the swing arm respectively.
[0012] As described above, a bridge pier underwater scour status monitoring device is provided on one side of the swing arm. The elastic limiting component includes an elastic lever and a mounting slot fixed on the protective cover. One end of the elastic lever is embedded and snapped into the mounting slot, and the other end is pressed against the side of the swing arm.
[0013] The underwater scour monitoring device for bridge piers described above: the top rod, top column, and swing arm are on the same plane, and the end faces of the top rod and top column are all treated with smooth arc transition.
[0014] As described above, a bridge pier underwater scour status monitoring device has a sealing ring fixedly attached to the protective cover at the bottom opening where it fits against the cover.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention realizes the active cleaning function during the descent of the intelligent sensing sonar through the first linkage structure. When the moving platform moves up and down, it drives the multiple cutting blades installed on the periphery to rotate. These cutters form an effective cutting barrier on the descent path of the intelligent sensing sonar, which can promptly remove obstacles such as aquatic plants and debris. This active protection mechanism fundamentally avoids aquatic plants from entering the working area of the intelligent sensing sonar during the descent to the bottom of the water, ensuring the stability of sound wave transmission and reception, and significantly improving the accuracy and reliability of monitoring data. Furthermore, this invention employs a unique automatic cover-opening system, which intelligently switches the working state of the intelligent sensing sonar through a second linkage structure. In its non-working state, the intelligent sensing sonar is completely retracted into the protective cover before descending to a specific depth underwater, with the cover remaining tightly closed. This effectively prevents the intrusion of water, sediment, and aquatic plants during descent. Only when the device descends to a certain height underwater, i.e., the predetermined working height, is the cover automatically opened via mechanical linkage, allowing the intelligent sensing sonar to be precisely exposed for detection. This working mode, which involves sealing during movement and exposing during measurement, ensures both the safety of the intelligent sensing sonar and the accuracy of monitoring timing. Attached Figure Description
[0016] Figure 1This is a first-view schematic diagram of the overall structure of a bridge pier underwater scour monitoring device.
[0017] Figure 2 This is a schematic diagram of the overall structure from a second perspective of a device for monitoring the underwater scour status of bridge piers.
[0018] Figure 3 A device for monitoring the underwater scour status of bridge piers Figure 1 A schematic diagram of the decomposed part of the structure.
[0019] Figure 4 A device for monitoring the underwater scour status of bridge piers Figure 3 A schematic diagram of the decomposed part of the structure.
[0020] Figure 5 This is a schematic diagram of the structure of a fixed sleeve and a drive shaft for the installation of an underwater scour monitoring device for bridge piers.
[0021] Figure 6 A device for monitoring the underwater scour status of bridge piers Figure 2 A schematic diagram of the decomposed part of the structure.
[0022] Figure 7 This is a schematic diagram of the structure of a bridge pier underwater scour monitoring device after partial cross-section of the protective cover.
[0023] Figure 8 This is a partial structural diagram of the casing of a bridge pier underwater scour monitoring device.
[0024] Figure 9 This is a partial structural schematic diagram of a bridge pier underwater scour status monitoring device.
[0025] Figure 10 A device for monitoring the underwater scour status of bridge piers Figure 9 Enlarged structural diagram at point A in the middle.
[0026] In the diagram: 1. Support base; 2. Guide bracket; 3. Movable platform; 4. Cylinder; 5. Piston rod; 6. Intelligent sensing sonar; 7. Fixing sleeve; 8. Drive shaft; 9. Cutting blade; 10. Spiral groove; 11. Ball bearing; 12. Protective cover; 13. Box cover; 14. Lock; 15. Guide sleeve; 16. Top rod; 17. Locking pin; 18. Limiting block; 19. Return spring; 20. Swing arm; 21. Elastic paddle; 22. Guide rod; 23. Sleeve; 24. Spring; 25. Slider; 26. Top column; 27. Connecting rod; 28. Mounting slot; 29. Support base. Detailed Implementation
[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0028] Please see Figures 1-10 As an embodiment of the present invention, a bridge pier underwater scour status monitoring device includes a support base 1 fixed on the bridge pier, a guide bracket 2 fixed at the bottom of the support base 1, a movable platform 3 arranged below the guide bracket 2, a cylinder 4 fixed on the support base 1, a piston rod 5 arranged at the output end of the cylinder 4, the piston rod 5 passing through the guide bracket 2 and fixed to the movable platform 3, an intelligent sensing sonar 6 for monitoring the underwater scour status fixed at the bottom of the movable platform 3, and multiple cutting blades 9 rotatably mounted on the periphery of the movable platform 3. The cutting blades 9 and the movable platform 3 are connected by a first linkage structure. When the movable platform 3 moves up and down, it will drive the cutting blades 9 to rotate. The bottom of the active platform 3 is fixed with a protective cover 12 with a bottom opening. A box cover 13 is hinged to the bottom opening of the protective cover 12. The intelligent sensing sonar 6 is stored inside the protective cover 12 when not in operation. A latch 14 is fixed on the box cover 13. A latch 17 is slidably provided on the protective cover 12 and is movably engaged with the latch 14. The latch 17 and the active platform 3 are connected by a second linkage structure. When the active platform 3 descends to a certain height at the bottom of the water, the latch 17 can be driven to move and automatically release the latch 14 to open the box cover 13 and expose the intelligent sensing sonar 6.
[0029] In this embodiment, the support base 1 is fixed to the bottom of the bridge pier. When it is necessary to monitor the underwater scouring status of the bridge pier, the cylinder 4 is activated, and the piston rod 5 at its output end pushes the movable platform 3 downward. During the downward movement of the movable platform 3, through the cooperation of the first linkage structure, multiple cutting blades 9 rotatably mounted on its periphery are driven to rotate. Before the intelligent sensing sonar 6 arrives at the monitoring point, the rotating cutting blades 9 clear obstacles such as water plants and debris in the path, creating a clean environment for the intelligent sensing sonar monitoring. The bottom of the movable platform 3 is fixed with a protective cover 12 with a bottom opening. The intelligent sensing sonar 6 is stored inside it when not in operation. The bottom opening of the protective cover 12 is closed by a hinged box cover 13 and secured by a fixed... The locking mechanism is achieved by the latch 14 fixed on the cover 13 and the locking pin 17 slidably set on the protective cover 12. When the movable platform 3 continues to descend to a certain height close to the bottom of the water, the second linkage structure is triggered. This structure drives the locking pin 17 to slide, automatically releasing its locking and fixing to the latch 14. The cover 13 then opens, exposing the intelligent sensing sonar 6 that was originally stored inside the protective cover 12, and put it into working state to accurately monitor the underwater scouring state of the bridge pier foundation. After the monitoring task is completed, the cylinder 4 pulls the movable platform 3 up through the piston rod 5. During the ascent, the first linkage structure drives the cutting blade 9 to rotate again, clearing any possible obstacles on the recovery path, and completing a complete monitoring cycle.
[0030] As a further embodiment of the present invention, the support base 1 is provided with bolt mounting holes, and the support base 1 is fixedly connected to the bridge pier by bolts.
[0031] In this embodiment, the support base 1 is aligned with the threaded holes pre-embedded on the surface of the pier through the bolt mounting holes thereon, and is fastened with high-strength stainless steel bolts. This connection method ensures the stability and reliability of the entire monitoring device on the pier, can withstand water flow impact and vibration, and is easy to install, disassemble and maintain.
[0032] As a further embodiment of the present invention, the first linkage structure includes a support base 29 fixed on the movable platform 3 and a fixed sleeve 7 fixed on the guide bracket 2. A transmission shaft 8 rotatably mounted on the support base 29 is movably inserted into the fixed sleeve 7. The bottom end of the transmission shaft 8 is fixed to the cutting blade 9. The transmission shaft 8 and the fixed sleeve 7 are engaged by a rolling groove structure. The transmission shaft 8 will rotate when it moves up and down in the fixed sleeve 7.
[0033] In this embodiment, when the movable platform 3 moves up and down, the support seat 29 fixed on the movable platform 3 moves accordingly, causing the transmission shaft 8, which is rotatably mounted on it, to slide within the fixed sleeve 7. Since the transmission shaft 8 and the fixed sleeve 7 are engaged by a groove structure, the linear motion of the transmission shaft 8 is converted into rotational motion, thereby driving the cutting blade 9 fixed at its bottom to rotate. This achieves automatic obstacle clearing during the lifting process, without the need for an additional power source, and the structure is simple and efficient.
[0034] As a further embodiment of the present invention, the groove structure includes a spiral groove 10 formed on the surface of the drive shaft 8 and a ball bearing 11 embedded and engaged in the inner wall of the fixed sleeve 7. The ball bearing 11 is movably engaged in the spiral groove 10 and can roll along the track where the spiral groove 10 is located.
[0035] In this embodiment, the groove structure is specifically composed of a spiral groove 10 machined on the surface of the drive shaft 8 and balls 11 embedded in the inner wall of the fixed sleeve 7. The balls 11 are made of wear-resistant steel and roll smoothly in the spiral groove 10, converting the linear force of up-and-down movement into rotational torque. This ball-groove fit reduces frictional resistance and ensures the smoothness and reliability of the rotation of the drive shaft 8.
[0036] As a further embodiment of the present invention, the second linkage structure includes a guide sleeve 15 fixed on the protective cover 12. A push rod 16 is movably inserted into the guide sleeve 15. One end of the push rod 16 is fixed to a locking pin 17, and the other end is fixed to a limiting block 18. A return spring 19 sleeved on the push rod 16 is connected between the limiting block 18 and the guide sleeve 15. An elastic relief component is provided on one side of the push rod 16. The elastic relief component is used to squeeze the push rod 16 to push the locking pin 17 to move and engage with the latch 14. The elastic relief component cooperates with the movable platform 3. When the movable platform 3 descends to a certain height, the elastic relief component releases the pressure on the push rod 16, and the return spring 19 elastically resets and pushes the locking pin 17 to move in the opposite direction and release from engagement with the latch 14.
[0037] In this embodiment, the second linkage structure guides the sliding of the top rod 16 through the guide sleeve 15. One end of the top rod 16 is fixed with a locking pin 17, and the other end is provided with a limiting block 18. The return spring 19 is sleeved on the top rod 16 and provides a return force. The elastic relief component squeezes the top rod 16, so that the locking pin 17 engages with the latch 14 to keep the lid 13 closed. When the movable platform 3 descends to the set height, the elastic relief component releases the pressure, and the return spring 19 returns to its original position, pushing the top rod 16 to move in the opposite direction and automatically opening the lid. This purely mechanical triggering mechanism is accurate and reliable and adaptable to the underwater environment.
[0038] As a further embodiment of the present invention, the elastic clearance component includes a swing arm 20 hinged to the protective cover 12, a guide rod 22 fixed on the support base 1, a sleeve 23 that penetrates the guide bracket 2 fixed on the movable platform 3, the guide rod 22 being movably inserted into the sleeve 23, a slider 25 being movably engaged inside the sleeve 23, a spring 24 being fixedly connected between the guide rod 22 and the slider 25, a top post 26 that penetrates the sleeve 23 being fixed to the bottom of the slider 25, a connecting rod 27 being provided between the top post 26 and the swing arm 20, and the two ends of the connecting rod 27 being hinged to the top post 26 and the swing arm 20 respectively.
[0039] In this embodiment, the swing arm 20 is hinged to the protective cover 12, and the guide rod 22 is fixed to the support base 1 and inserted into the upper sleeve 23 of the movable platform 3. When the movable platform 3 descends, the sleeve 23 descends synchronously, the guide rod 22 is relatively fixed, and the spring 24 is initially in a pre-compressed state, which will squeeze the slider 25 to always be inside the bottom wall of the sleeve 23. When the sleeve 23 descends, the spring 24 gradually returns from the compressed state to the free state. When it descends to a certain height, it reaches the free state. At the same time, the movable platform 3 continues to descend, driving the sleeve 23 to continue to descend. The spring 24 will be gradually stretched, and the spring 24 will pull the slider 25 and the top column 26 to move upward. The top column 26 drives the swing arm 20 to rotate through the connecting rod 27, thereby releasing the compression on the top rod 16. The reset spring 19 elastically resets and controls the displacement of the top rod 16, so that the locking pin 17 releases the locking and fixing of the latch 14.
[0040] As a further embodiment of the present invention, an elastic limiting component is provided on one side of the swing arm 20. The elastic limiting component includes an elastic lever 21 and a mounting slot 28 fixed on the protective cover 12. One end of the elastic lever 21 is embedded and snapped into the mounting slot 28, and the other end is pressed against the side of the swing arm 20.
[0041] In this embodiment, the elastic limiting component is implemented by the elastic lever 21 and the mounting slot 28. The elastic lever 21 is always pressed against the side of the swing arm 20 under the action of the spring, providing a stable restoring force and preventing accidental triggering caused by the swing arm 20 swinging or vibrating, thereby enhancing the stability and safety of the second linkage structure.
[0042] As a further embodiment of the present invention, the top rod 16, the top column 26, and the swing arm 20 are on the same plane, and the end faces of the top rod 16 and the top column 26 are all treated with smooth arc transition.
[0043] In this embodiment, the push rod 16, the push column 26, and the swing arm 20 are arranged in the same plane to ensure collinearity and efficiency of force transmission. The end faces of the push rod 16 and the push column 26 are rounded to reduce impact and wear during contact, making the linkage process smoother.
[0044] As a further aspect of the present invention, a seal is provided at the bottom opening of the protective cover 12 where it fits against the box cover 13, and the seal is fixedly attached to the protective cover 12.
[0045] In this embodiment, a rubber sealing ring is fixedly adhered to the bottom opening edge of the protective cover 12. When the cover 13 is closed, the sealing ring fits tightly with the cover 13 to form a waterproof and dustproof seal, effectively preventing mud and debris from entering the interior of the protective cover, reducing corrosion and contamination of the intelligent sensing sonar 6, and extending the equipment life.
[0046] The working principle of this invention is as follows: When the monitoring work begins, the latch 14 engages with the pin 17, keeping the cover 13 closed. The cylinder 4 is activated, pushing the piston rod 5 and the movable platform 3 downwards. During the descent, the movable platform 3 drives multiple cutting blades 9 to rotate at high speed through the first linkage structure, pre-cutting and clearing aquatic plants, floating objects, etc., along the descent path, thus creating a clean channel for intelligent sonar monitoring. At this time, the intelligent sonar 6 is safely enclosed within the protective cover 12, and the cover 13 is locked. When the movable platform 3 descends to a predetermined height close to the riverbed, the second linkage structure is triggered. The specific process is as follows: the device is fixed to the support base. The guide rod 22 of 1 generates relative displacement with respect to the sleeve 23 on the descending movable platform 3. The spring 24 pushes the slider 25 and the top column 26 to move upward. The top column 26 pulls one end of the swing arm 20 to rotate through the connecting rod 27, releasing the pressure on the top rod 16. The reset spring 19 sleeved on the top rod 16 releases its elastic potential energy, pushing the top rod 16 and the locking pin 17 to move, causing the locking pin 17 to disengage from the cover lock 14. The cover 13 then rotates open around the hinge under the action of gravity, exposing the intelligent sensing sonar 6 and entering the working state. It begins to accurately measure the distance of the scour pits around the bridge pier. After the monitoring is completed, the cylinder 4 drives the movable platform 3 to rise again to complete the monitoring.
[0047] The above embodiments are exemplary and not restrictive. Therefore, any technical solutions that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention are included within the scope of the present invention.
Claims
1. A device for monitoring the underwater scour status of bridge piers, comprising a support base (1) fixed on the bridge pier, characterized in that, The bottom of the support base (1) is fixed with a guide bracket (2), and a movable platform (3) is provided below the guide bracket (2). A cylinder (4) is fixed on the support base (1), and a piston rod (5) is provided at the output end of the cylinder (4). The piston rod (5) passes through the guide bracket (2) and is fixed to the movable platform (3). A smart sensor sonar (6) for monitoring the underwater flushing status is fixed at the bottom of the movable platform (3). Multiple cutting blades (9) are rotatably installed on the periphery of the movable platform (3). The cutting blades (9) and the movable platform (3) cooperate through a first linkage structure. When the movable platform (3) moves up and down, it will drive the cutting blades (9) to rotate. The bottom of the active platform (3) is fixed with a protective cover (12) with a bottom opening. A box cover (13) is hinged to the bottom opening of the protective cover (12). The intelligent sensing sonar (6) is stored inside the protective cover (12) when not in operation. A buckle (14) is fixed on the box cover (13). A latch (17) is slidably provided on the protective cover (12) and engages with the latch (14). The latch (17) and the active platform (3) cooperate through a second linkage structure. When the active platform (3) descends to a certain height at the bottom of the water, the latch (17) can be driven to move and automatically release the latch (14) to open the box cover (13) and expose the intelligent sensing sonar (6).
2. The underwater scour monitoring device for bridge piers according to claim 1, characterized in that, The support base (1) has bolt mounting holes, and the support base (1) is fixedly connected to the bridge pier by bolts.
3. The underwater scour monitoring device for bridge piers according to claim 1, characterized in that, The first linkage structure includes a support base (29) fixed on the movable platform (3) and a fixed sleeve (7) fixed on the guide bracket (2). A drive shaft (8) rotatably installed on the support base (29) is movably inserted into the fixed sleeve (7). The bottom end of the drive shaft (8) is fixed to the cutting blade (9). The drive shaft (8) and the fixed sleeve (7) are engaged by a grooving structure. The drive shaft (8) will rotate when it moves up and down inside the fixed sleeve (7).
4. The underwater scour monitoring device for bridge piers according to claim 3, characterized in that, The groove structure includes a spiral groove (10) formed on the surface of the drive shaft (8) and a ball (11) embedded and engaged in the inner wall of the fixed sleeve (7). The ball (11) is movably engaged in the spiral groove (10) and can roll along the track where the spiral groove (10) is located.
5. The underwater scour monitoring device for bridge piers according to claim 1, characterized in that, The second linkage structure includes a guide sleeve (15) fixed on the protective cover (12). A top rod (16) is movably inserted into the guide sleeve (15). One end of the top rod (16) is fixed to a locking pin (17), and the other end is fixed to a limiting block (18). A return spring (19) sleeved on the top rod (16) is connected between the limiting block (18) and the guide sleeve (15). An elastic relief component is provided on one side of the top rod (16). The elastic relief component is used to squeeze the top rod (16) to push the locking pin (17) to move and engage with the latch (14). The elastic relief component cooperates with the movable platform (3). When the movable platform (3) descends to a certain height, the elastic relief component releases the squeezing of the top rod (16), and the return spring (19) elastically resets and pushes the locking pin (17) to move in the opposite direction and release the engagement with the latch (14).
6. The underwater scour monitoring device for bridge piers according to claim 5, characterized in that, The elastic clearance assembly includes a swing arm (20) hinged to a protective cover (12), a guide rod (22) fixed on the support base (1), a sleeve (23) through the guide bracket (2) fixed on the movable platform (3), the guide rod (22) being movably inserted into the sleeve (23), a slider (25) being movably engaged inside the sleeve (23), a spring (24) being fixedly connected between the guide rod (22) and the slider (25), a top column (26) through the sleeve (23) being fixed at the bottom of the slider (25), a connecting rod (27) being provided between the top column (26) and the swing arm (20), and the two ends of the connecting rod (27) being hinged to the top column (26) and the swing arm (20) respectively.
7. The underwater scour monitoring device for bridge piers according to claim 6, characterized in that, An elastic limiting component is provided on one side of the swing arm (20). The elastic limiting component includes an elastic paddle (21) and a mounting slot (28) fixed on the protective cover (12). One end of the elastic paddle (21) is embedded and snapped into the mounting slot (28), and the other end is pressed against the side of the swing arm (20).
8. The underwater scour status monitoring device for bridge piers according to claim 6, characterized in that, The top rod (16), top column (26), and swing arm (20) are on the same plane, and the end faces of the top rod (16) and top column (26) are all treated with smooth arc transition.
9. The underwater scour monitoring device for bridge piers according to claim 1, characterized in that, A sealing ring is provided at the bottom opening of the protective cover (12) where it fits against the box cover (13).