Bridge pier column detection device
By designing a bridge pier column detection device, the combination of a ring-moving camera and a half-ring gear is solved, and the problem of difficulty in ensuring distance equality and stability of manual shooting is achieved, and efficient and accurate detection of bridge pier columns is achieved.
Patent Information
- Application Number
- CN202421483436.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-06-27
AI Technical Summary
In the prior art, when shooting bridge pier columns manually, it is difficult to ensure that the distance between the camera and pier columns at each angle is equal, resulting in poor overall connection of the shooting picture, and the stability of manual shooting is difficult to control, which easily leads to jitter, affects the shooting effect, and thus makes it difficult to be accurate. Judge the quality of the bridge pier.
Design a bridge pier column detection device, through a camera that moves circumferentially, uses the combination of half-rings and half-rings to form a closed loop, ensuring that the camera is equidistantly along the side wall of the pier column, and passes through the positioning rod and the limit position The fit of the rod realizes stable connection and disassembly of the half-ring, ensuring stable movement of the camera.
The distance equality between the camera and the pier column is achieved at each angle, ensuring the overall connection of the shooting picture, improving shooting stability, facilitating accurate observation of the pier column, and improving the accuracy of detection of the pier quality.
Smart Images

Figure CN222513897U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of bridge detection, and in particular relates to a bridge pier detection device. Background Art
[0002] Piers are important components in highway bridges, railway bridges, pedestrian bridges, overpasses, ramp bridges, flyovers and other projects. In civil engineering, they are used to bear the lower load-bearing objects of the upper structure. During the production and subsequent maintenance of piers, routine inspections such as crack inspection are required.
[0003] During the inspection of bridge piers, it is necessary to use a camera to shoot and record the conditions of the circumferential side walls of the bridge piers. Currently, it is often necessary to manually shoot around the piers, but the manual shooting and recording method is difficult to ensure that the distance between the camera and the pier is equal when shooting at each angle, and thus it is difficult to ensure the overall connectivity of the final shooting picture. In addition, the stability of manual shooting is difficult to control, and the shaking during the shooting process causes the shooting effect to be unclear, making it difficult to make an accurate judgment on the quality of the bridge piers. Utility Model Content
[0004] In view of the problem that the existing manual shooting and recording methods in the prior art are difficult to ensure that the distance between the camera and the pier is equal when shooting at each angle, and thus it is difficult to ensure the overall connectivity of the final shooting picture. In addition, the stability of manual shooting is difficult to control, and the shaking during shooting leads to unclear shooting effects, making it difficult to make an accurate judgment on the quality of the bridge piers, the utility model provides a bridge pier detection device, which can always shoot and record equidistantly relative to the side wall of the pier through a circumferentially moving camera, ensuring the equal distance between the camera and the pier when shooting at each angle, thereby ensuring that the final shooting picture is effectively connected as a whole, making it convenient for staff to accurately observe the condition of the pier. The specific technical scheme is as follows:
[0005] A bridge pier detection device comprises a camera and two groups of docking units, wherein the rear sides of the two groups of docking units are rotatably connected, and the front sides of the two groups of docking units are connected by a locking unit, and each group of the docking units comprises a semi-ring body, a connecting rod is vertically installed on the inner wall of the semi-ring body, a semi-gear ring is fixedly installed on the outer wall of the connecting rod, and the semi-gear ring is concentrically arranged with the semi-ring body, and a semi-limiting strip and a semi-limiting seat are respectively installed on the outer wall of the semi-ring body along the circumferential direction, and the semi-limiting strip is arranged above the semi-limiting seat;
[0006] Wherein, the rear sides of the semi-ring bodies in the two groups of docking units are rotatably connected, and the front sides of the semi-ring bodies in the two groups of docking units are connected via locking units.
[0007] In the above technical solution, the locking unit includes a positioning rod installed at the free end of the left semi-ring body, a protrusion is installed at the top end of the positioning rod, and the locking unit also includes a limiting rod slidably embedded into the inner cavity of the right semi-ring body from bottom to top, the outer wall of the limiting rod is sleeved with a spring, and the two ends of the spring are respectively connected to the outer wall of the limiting rod and the outer wall of the right semi-ring body, the outer wall of the limiting rod is penetrated from left to right with a positioning hole, and the positioning rod is embedded into the inner cavity of the positioning hole from left to right;
[0008] Wherein, the inner wall of the top end of the positioning hole is inclined in a downward trend from left to right.
[0009] In the above technical solution, a displacement unit is provided on the outer wall of the semi-ring body for circumferential sliding, the displacement unit moves circumferentially along the upper surface of the semi-gear ring, and the camera is arranged at the top of the displacement unit.
[0010] In the above technical solution, the displacement unit includes a moving seat, a motor is installed on the outer wall of the moving seat, a driving shaft is connected to the output end of the motor, the driving shaft passes through the outer wall of the moving seat and is connected to a gear, and the outer wall of the gear is meshed and connected with the outer wall of the half gear ring;
[0011] Wherein, a mounting seat is installed on the top of the outer wall of the movable seat, and the camera is installed on the top of the mounting seat.
[0012] In the above technical solution, a limit block is installed at the bottom end of the outer wall of the movable seat, the limit block is arranged in an L shape, and a sliding groove for the limit block to slide inward is provided at the bottom end of the outer wall of the semi-limit seat.
[0013] In the above technical solution, a first movable pulley is rollingly arranged at a position of the movable seat opposite to the upper surface of the semi-ring body, and the first movable pulley is rollingly arranged on the upper surface of the semi-ring body.
[0014] In the above technical solution, a second movable pulley is rollingly arranged at a position of the movable seat opposite to the side wall of the semi-limiting strip, and the second movable pulley is rollingly arranged on the outer wall of the semi-limiting strip.
[0015] In the above technical solution, a support arm is vertically installed at the bottom end of the outer wall of the semi-ring body in one group of the docking units.
[0016] Compared with the prior art, the bridge pier detection device of the utility model has the following beneficial effects:
[0017] First, in view of the problem that it is difficult to ensure that the distance between the camera and the pier is equal when shooting at each angle in the manual shooting and recording method, and thus it is difficult to ensure the overall connection of the final shooting picture, the utility model can form a closed loop on the outer wall of the pier through the half gear ring after docking, so that the gear moves circumferentially along the upper surface of the half gear ring, and the camera is prompted to shoot equidistantly along the side wall of the pier. Compared with the manual shooting method, the utility model can always shoot and record equidistantly relative to the side wall of the pier through the camera moving in the circumference, ensuring the equality of the distance between the camera and the pier when shooting at each angle, thereby ensuring that the final shooting picture is effectively connected as a whole, which is convenient for the staff to accurately observe the situation of the pier;
[0018] Second, in view of the problem that the stability of manual shooting is difficult to control and the shooting effect is unclear due to shaking during shooting, it is difficult to make an accurate judgment on the quality of the bridge pier. The utility model can form a complete path through two spliced half gear rings, so that the rotating gears always move stably along the outer wall of the half gear rings, thereby enabling the camera to take stable photos along the way. The locking unit for the splicing and positioning of the two half gear rings is arranged on the lower surface of the half gear rings, which will not interfere with the smooth movement of the gears, thereby ensuring the stability of the camera during shooting, and helping to make more accurate detection and judgment of the quality of the bridge piers based on the stable shooting effect.
[0019] 3. The utility model can promote the two half ring bodies to be inserted and positioned or to be disengaged from the limit position through the cooperation of the positioning rod, the protrusion, the limit rod, the spring and the positioning hole, thereby realizing the closing or disassembly of the two half gear rings. The two half gear rings in the closed state can form a closed loop on the outer wall of the pier column to detect the outer wall of the pier column. The two half gear rings in the disassembled state can be disassembled on the outer wall of the pier column, which is convenient for disassembling the equipment from the pier column and flexible in use.
[0020] In summary, the utility model can always take equidistant photos and records relative to the side wall of the pier through the circumferentially moving camera, ensuring the equality of the distance between the camera and the pier when shooting at each angle, thereby ensuring that the final shooting picture as a whole is effectively connected, making it convenient for staff to accurately observe the condition of the pier. In addition, the locking unit for the splicing and positioning of the two half-tooth rings is arranged on the lower surface of the half-tooth ring, which will not interfere with the smooth movement of the gear, thereby ensuring the stability of the camera during shooting, and helping to make more accurate detection and judgment of the quality of the pier based on the stable shooting effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the structure of the mobile seat of the utility model;
[0022] Figure 2 This is a front cross-sectional view of the limit rod of the utility model;
[0023] Figure 3It is a partial structural schematic diagram of the gear of the utility model;
[0024] Figure 4 It is a partial structural schematic diagram of the limit block of the utility model;
[0025] Figure 5 It is a schematic diagram of the cross-sectional structure of a semi-ring body of the utility model;
[0026] Figure 6 It is a schematic diagram of the cross-sectional structure of the half gear ring of the utility model;
[0027] Figures 1 to 6 Among them, 1. semi-ring body, 2. connecting rod, 3. semi-gear ring, 4. semi-limiting bar, 5. semi-limiting seat, 6. positioning rod, 7. protrusion, 8. limiting rod, 9. spring, 10. positioning hole, 12. moving seat, 13. limiting block, 14. motor, 15. driving shaft, 16. gear, 17. mounting seat, 18. camera, 19. first moving pulley, 20. second moving pulley, 21. supporting arm. DETAILED DESCRIPTION
[0028] The following is a combination of specific implementation cases and attached Figures 1 to 6 The present invention is further described below, but the present invention is not limited to these embodiments.
[0029] Regarding the problem that it is difficult to ensure that the distance between the camera and the pier is equal when shooting at each angle, and thus it is difficult to ensure the overall coherence of the final picture, refer to Figures 1 to 6As shown, a bridge pier inspection device is proposed, including a camera 18. The camera 18 is a common device commonly used in the existing market to inspect the quality of bridge piers. In this embodiment, the camera 18 is equivalent to the sampler in the utility model patent with publication number CN218823990U. The camera 18 is used to take pictures of the outer wall of the pier. The captured pictures can be viewed in real time by connecting the wireless communication component. The above technologies are all existing technologies and will not be described in detail here. The device also includes two groups of docking units. The rear sides of the two groups of docking units are rotatably connected, and the front sides of the two groups of docking units are connected by locking units. The locking units cause the two groups of docking units to form a closed loop, so that the camera 18 can move circumferentially to take pictures of the side walls of the piers. Each group of docking units includes a semi-ring body 1, and the inner wall of the semi-ring body 1 is vertically installed with A connecting rod 2, a half gear ring 3 is fixedly installed on the outer wall of the connecting rod 2, and a stable connection between the semi-ring body 1 and the semi-ring body 3 can be achieved through the connecting rod 2, and the half gear ring 3 is concentrically arranged with the semi-ring body 1. When the two semi-ring bodies 1 are closed to form a loop, the two semi-ring bodies 3 can form a seamless entire gear ring, and the outer wall of the semi-ring body 1 is respectively installed with a semi-limiting strip 4 and a semi-limiting seat 5 along the circumferential direction, and the semi-limiting strip 4 is arranged above the semi-limiting seat 5. The semi-limiting strip 4 and the semi-limiting seat 5 can assist the camera 18 to perform stable circumferential detection; wherein, the rear sides of the semi-ring bodies 1 in the two groups of docking units are rotatably connected by a pin shaft, and the front sides of the semi-ring bodies 1 in the two groups of docking units are connected by a locking unit, and the locking unit can realize the connection of the front sides of the two semi-ring bodies 1, so that the two semi-ring bodies 3 can form a seamless gear ring.
[0030] See also Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, the locking unit includes a positioning rod 6 installed at the free end of the left semi-ring body 1, and a protrusion 7 is installed at the top end of the positioning rod 6. The locking unit also includes a limiting rod 8 that slides from bottom to top and is embedded into the inner cavity of the right semi-ring body 1. The outer wall of the limiting rod 8 is sleeved with a spring 9, and the two ends of the spring 9 are respectively connected to the outer wall of the limiting rod 8 and the outer wall of the right semi-ring body 1. A positioning hole 10 is opened through the outer wall of the limiting rod 8 from left to right, and the positioning rod 6 is embedded into the inner cavity of the positioning hole 10 from left to right. When the positioning rod 6 is gradually embedded into the inner cavity of the positioning hole 10 to the right, the protrusion 7 at the top end of the positioning rod 6 first moves to the right along the inclined inner wall of the positioning hole 10. The movement causes the limiting rod 8 to be forced to move upward, and the spring 9 is forced to compress at this time. When the protrusion 7 at the end of the positioning rod 6 moves to the right side of the limiting rod 8, the elastic force of the spring 9 causes the limiting rod 8 to return to its initial position downward. At this time, the positioning rod 6 is positioned in the inner cavity of the right semi-ring body 1, and with the help of the limiting of the protrusion 7, the positioning rod 6 can be prevented from automatically leaving the inner cavity of the positioning hole 10 to the left; wherein, the inner wall of the top end of the positioning hole 10 is inclined from left to right with a downward trend, thereby facilitating the positioning rod 6 to move to the right side and be embedded in the inner cavity of the positioning hole 10, and ensuring the stability of the limiting rod 6 in the inner cavity of the positioning hole 10 after positioning;
[0031] When the equipment is used to perform circumferential detection on the bridge pier, the rear sides of the two semi-ring bodies 1 are rotated and connected, and the front sides of the two semi-ring bodies 1 are driven by external force to embrace and enclose the outer wall of the pier. As the positioning rod 6 installed on the outer wall of the left semi-ring body 1 gradually extends into the inner cavity of the right semi-ring body 1, the protrusion 7 at the end of the positioning rod 6 gradually moves to the right along the inner cavity of the positioning hole 10, forcing the limit rod 8 to be forced to move upward. At this time, the spring 9 is forced to compress. When the protrusion 7 at the end of the positioning rod 6 moves to the right side of the limit rod 8, the elastic force of the spring 9 is used to force the limit rod 8 to return to its initial position downward. At this time, the positioning rod 6 is positioned in the inner cavity of the right semi-ring body 1, thereby realizing automatic engagement and locking at the joint between the left semi-ring body 1 and the right semi-ring body 1.
[0032] See also Figure 1 , Figure 3 and Figure 4As shown, a displacement unit is provided on the outer wall of the semi-ring body 1 for circumferential sliding, and the displacement unit moves circumferentially along the upper surface of the semi-gear ring 3, and a camera 18 is provided at the top of the displacement unit. The displacement unit moves circumferentially along the upper surface of the two connected semi-gear rings 3, so that the camera 18 performs equidistant shooting and collection relative to the side wall of the pier column; the displacement unit includes a moving seat 12, and a motor 14 is installed on the outer wall of the moving seat 12. The output end of the motor 14 is connected to a driving shaft 15 through a coupling, and the driving shaft 15 passes through the outer wall of the moving seat 12 and is connected to a gear 16, and the outer wall of the gear 16 is meshed and connected with the outer wall of the semi-gear ring 3, through The turned-on motor 14 causes the driving shaft 15 to drive the gear 16 to rotate. Since the outer wall of the gear 16 is meshed with the outer wall of the half gear ring 3, the rotating gear 16 causes the moving seat 12 to translate circumferentially along the top of the semi-ring body 1; wherein, a mounting seat 17 is installed at the top of the outer wall of the moving seat 12, and a camera 18 is installed at the top of the mounting seat 17. The moving seat 12 moves circumferentially to cause the mounting seat 17 and the camera 18 at the top of the moving seat 12 to move circumferentially. The circumferentially moving camera 18 is used to take pictures and record the side walls of the bridge pier, so as to facilitate the subsequent observation and detection of the outer wall conditions of the pier.
[0033] See also Figure 4 As shown, a limit block 13 is installed at the bottom end of the outer wall of the moving seat 12, and the limit block 13 is set to be L-shaped. A sliding groove for the limit block 13 to slide in is opened at the bottom end of the outer wall of the semi-limiting seat 5. When the moving seat 12 moves, the limit block 13 is prompted to move along the bottom end sliding groove of the semi-limiting seat 5 to ensure that the moving seat 12 always moves circumferentially smoothly and will not separate from the outer wall of the semi-ring body 1.
[0034] See also Figure 3 As shown, a first movable pulley 19 is rollingly arranged at a position where the movable seat 12 is opposite to the upper surface of the semi-ring body 1, and the first movable pulley 19 is rollingly arranged on the upper surface of the semi-ring body 1. When the movable seat 12 moves, the first movable roller 19 can be prompted to roll along the upper surface of the semi-ring body 1 to limit the moving direction of the movable seat 12, thereby ensuring that the movable seat 12 moves smoothly along the outer wall of the semi-ring body 1; a second movable pulley 20 is rollingly arranged at a position where the movable seat 12 is opposite to the side wall of the semi-limiting strip 4, and the second movable pulley 20 is rollingly arranged on the outer wall of the semi-limiting strip 4. When the movable seat 12 moves, the second movable pulley 20 in the inner cavity of the movable seat 12 can roll along the outer wall of the semi-limiting strip 4 to further limit the movement of the movable seat 12.
[0035] A support arm 21 is vertically mounted at the bottom end of the outer wall of the semi-ring body 1 in one set of docking units. Figure 1As shown, the support arm 21 is installed at the bottom end of the outer wall of the semi-ring body 1 in the left docking unit. The support arm 21 can support the entire device, so that the entire device is stably arranged around the outer wall of the pier. In addition, the support arm 21 can be set as a telescopic support arm 21 with adjustable overall height according to usage requirements, and the equipment can be adjusted to detection positions of different heights as needed.
[0036] The working principle of a bridge pier detection device in this embodiment is as follows:
[0037] When the bridge pier is circumferentially inspected by the equipment, the rear sides of the two semi-ring bodies 1 are rotated and connected, and the front sides of the two semi-ring bodies 1 are driven by external force to embrace and enclose the outer wall of the pier. As the positioning rod 6 installed on the outer wall of the left semi-ring body 1 gradually extends into the inner cavity of the right semi-ring body 1, the protrusion 7 at the end of the positioning rod 6 gradually moves to the right along the inner cavity of the positioning hole 10, forcing the limit rod 8 to be forced to move upward. At this time, the spring 9 is forced to compress. When the protrusion 7 at the end of the positioning rod 6 moves to the right side of the limit rod 8, the elastic force of the spring 9 is used to force the limit rod 8 to return to its initial position downward. At this time, the positioning rod 6 is positioned in the inner cavity of the right semi-ring body 1, thereby realizing automatic engagement and locking at the joint between the left semi-ring body 1 and the right semi-ring body 1.
[0038] The two semi-ring bodies 1 after docking and connection promote the seamless docking of the two semi-gear rings 3 inside the semi-ring bodies 1, and the two semi-gear rings 3 form a completely complete gear ring channel. The driving shaft 15 drives the gear 16 to rotate through the turned-on motor 14. Since the outer wall of the gear 16 is meshed and connected with the outer wall of the semi-gear ring 3, and the limit block 13 connected to the bottom end of the moving seat 12 moves along the inner cavity of the semi-limiting seat 5, the rotating gear 16 promotes the moving seat 12 to translate circumferentially along the top of the semi-ring body 1, so as to promote the mounting seat 17 and the camera 18 at the top of the moving seat 12 to move circumferentially, and the side wall of the bridge pier is photographed and recorded by the circumferentially moving camera 18, so as to facilitate the subsequent observation and detection of the outer wall of the pier.
[0039] In the process of the moving seat 12 moving along the outer wall of the semi-ring body 1, the second moving pulley 20 in the inner cavity of the moving seat 12 rolls along the outer wall of the semi-limiting strip 4, and the first moving pulley 19 in the inner cavity of the moving seat 12 rolls along the upper surface of the semi-ring body 1 to limit the moving direction of the moving seat 12 and ensure that the moving seat 12 moves smoothly along the outer wall of the semi-ring body 1; at the same time, the limiting block 13 installed at the bottom end of the moving seat 12 slides along the inner cavity of the semi-limiting seat 5 to limit the movement of the moving seat 12 in the vertical direction, so as to prevent the moving seat 12 from moving upward during the movement process and affecting the normal rotation of the gear 16;
[0040] The utility model can always take equidistant photos and records relative to the side wall of the pier by means of the circumferentially moving camera 18, thereby ensuring that the distance between the camera 18 and the pier is equal when shooting at each angle, thereby ensuring that the final shooting picture is effectively connected as a whole, making it convenient for staff to accurately observe the condition of the pier. In addition, the splicing locking unit of the two half gear rings 3 is arranged on the lower surface of the half gear ring 3, which will not interfere with the smooth movement of the gear 16, thereby ensuring the stability of the camera 18 during shooting, and facilitating more accurate detection and judgment of the quality of the pier based on the stable shooting effect.
[0041] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A bridge pier detection device, comprising a camera (18), characterized in that: It also comprises two groups of docking units, the rear sides of the two groups of docking units are rotatably connected, and the front sides of the two groups of docking units are connected via a locking unit, each group of the docking units comprises a semi-ring body (1), a connecting rod (2) is vertically mounted on the inner wall of the semi-ring body (1), a semi-gear ring (3) is fixedly mounted on the outer wall of the connecting rod (2), and the semi-gear ring (3) is concentrically arranged with the semi-ring body (1), and a semi-limiting strip (4) and a semi-limiting seat (5) are respectively mounted on the outer wall of the semi-ring body (1) along the circumferential direction, and the semi-limiting strip (4) is arranged above the semi-limiting seat (5); The rear sides of the semi-ring bodies (1) in the two groups of docking units are rotatably connected, and the front sides of the semi-ring bodies (1) in the two groups of docking units are connected via a locking unit.
2. A bridge pier detection device according to claim 1, characterized in that: The locking unit comprises a positioning rod (6) mounted on the free end of the left semi-ring body (1), a protrusion (7) being mounted on the top end of the positioning rod (6), and the locking unit further comprises a limiting rod (8) which is slidably embedded into the inner cavity of the right semi-ring body (1) from bottom to top, the outer wall of the limiting rod (8) is sleeved with a spring (9), the two ends of the spring (9) are respectively connected to the outer wall of the limiting rod (8) and the outer wall of the right semi-ring body (1), a positioning hole (10) is formed through the outer wall of the limiting rod (8) from left to right, and the positioning rod (6) is embedded into the inner cavity of the positioning hole (10) from left to right; The inner wall of the top end of the positioning hole (10) is inclined in a downward trend from left to right.
3. A bridge pier detection device according to claim 1, characterized in that: The outer wall of the semi-ring body (1) is provided with a displacement unit which slides circumferentially, the displacement unit moves circumferentially along the upper surface of the semi-gear ring (3), and the camera (18) is arranged at the top of the displacement unit.
4. A bridge pier detection device according to claim 3, characterized in that: The displacement unit comprises a moving seat (12), an outer wall of the moving seat (12) is mounted with a motor (14), an output end of the motor (14) is connected with a drive shaft (15), the drive shaft (15) passes through the outer wall of the moving seat (12) and is connected with a gear (16), and the outer wall of the gear (16) is meshingly connected with the outer wall of the half gear ring (3); Wherein, a mounting seat (17) is mounted on the top of the outer wall of the movable seat (12), and the camera (18) is mounted on the top of the mounting seat (17).
5. A bridge pier detection device according to claim 4, characterized in that: A limit block (13) is installed at the bottom end of the outer wall of the movable seat (12), and the limit block (13) is arranged in an L shape. A sliding groove for the limit block (13) to slide inward is provided at the bottom end of the outer wall of the semi-limit seat (5).
6. A bridge pier detection device according to claim 4, characterized in that: A first movable pulley (19) is rollably arranged on the movable seat (12) at a position opposite to the upper surface of the semi-ring body (1), and the first movable pulley (19) is rollably arranged on the upper surface of the semi-ring body (1).
7. A bridge pier detection device according to claim 4, characterized in that: A second movable pulley (20) is rollably arranged at a position of the movable seat (12) opposite to the side wall of the semi-limiting strip (4), and the second movable pulley (20) is rollably arranged on the outer wall of the semi-limiting strip (4).
8. A bridge pier detection device according to claim 1, characterized in that: A support arm (21) is vertically mounted on the bottom end of the outer wall of the semi-ring body (1) in one group of the docking units.
Citation Information
Patent Citations
A bridge pier detection device
CN218823990U