Bridge safety early warning device

Abstract

The invention relates to the technical field of bridge health monitoring equipment, and discloses a bridge safety early warning device which comprises a fiber bragg grating sensor, the two sides of the fiber bragg grating sensor are fixedly sleeved with connecting bases used for fixing the fiber bragg grating sensor, and the tops of the connecting bases are rotationally connected with mounting bases. Fixing rods are movably connected to the two sides of the mounting base in a sleeving mode, nuts are arranged at the bottoms of the fixing rods in a threaded sleeving mode, a connecting plate is movably connected to the top of the mounting base, and a conduction mechanism is arranged in the mounting base. The mounting plate drives the rotating ring to move, so that the rotating ring moves relative to the connecting round block when the nut is loosened, the relative movement amount between the mounting plate and the bridge body is detected, the corresponding first gear and the corresponding second gear are matched, the two sides of the fiber grating sensor are driven to rotate and deform respectively, and the nut loosening amount is automatically detected; and timely maintenance is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of bridge health monitoring equipment, and in particular to a bridge safety early warning device. Background Art

[0002] The quality of bridge structures is related to transportation safety. Since bridges are affected by multiple factors such as vibration, strong wind, temperature, fatigue, and moving loads, their structural performance is easily degraded. Therefore, it is necessary to use bridge health monitoring and early warning equipment to conduct dynamic quality monitoring and safety early warning of bridges, timely discover and deal with potential risks, and ensure the safe operation of bridges. Existing bridge health monitoring and early warning equipment includes optical fiber strain sensors, which are bolted to the monitoring points at the bottom of the bridge. The optical fiber strain sensors monitor the deformation of the bridge during operation. When the strain exceeds the rated range, the controller controls the alarm to sound an alarm.

[0003] However, traditional bridge health monitoring and early warning equipment uses bolts to fix the mounting base of the optical fiber strain sensor on the bottom of the bridge body. After long-term monitoring of the deformation of the bridge, the bolts that fix the mounting base are prone to loosening under disturbance, and the distance between the nut and the bridge body increases, which will cause deviations in the sensor's detection results and inconsistencies between the measurement data, and even zero point offset. It is difficult to detect the looseness before the nut loosens, making it difficult to maintain the bridge health monitoring and early warning equipment in a timely manner, affecting the effective monitoring of bridge health and timely early warning. Summary of the invention

[0004] In view of the deficiencies in the use of the existing bridge health monitoring and early warning equipment mentioned in the background technology, the present invention provides a bridge safety early warning device, which has the advantages of self-detecting loose errors of fixed structures and timely compensating for errors, thereby solving the technical problems raised in the above background technology.

[0005] The present invention provides the following technical solution: a bridge safety warning device, comprising a fiber optic Bragg grating sensor, wherein both sides of the fiber optic Bragg grating sensor are fixedly sleeved with a connecting seat for fixing the fiber optic Bragg grating sensor, the top of the connecting seat is rotatably connected with a mounting seat, both sides of the mounting seat are movably sleeved with a fixing rod, and the bottom thread of the fixing rod is sleeved with a nut.

[0006] A connecting plate is movably connected to the top of the mounting seat, and a conducting mechanism is arranged inside the mounting seat. The conducting mechanism can drive the mounting seat to rotate according to the relative movement distance between the connecting plate and the mounting seat, so that the fiber grating sensor generates a corresponding horizontal deformation amount for self-detection, and judges whether the looseness of the nut is greater than the rated value according to the result of the self-detection of the fiber grating sensor.

[0007] Preferably, the fiber grating sensors are arranged in a plurality and are evenly spaced in the length and width directions of the bridge, and the fiber grating sensors in the width direction of the bridge are connected to each other in series through optical fibers.

[0008] Preferably, the transmission mechanism includes a connecting round block, which is fixedly connected to the connecting plate. The top of the mounting seat is rotatably connected to a rotating ring through a bearing. An arc groove is provided on the outer side of the connecting round block. A movable rod adapted to the arc groove is fixedly connected to the inner side of the rotating ring. When the rotating ring moves axially relative to the connecting round block, the arc groove drives the movable rod to rotate.

[0009] Preferably, the transmission mechanism also includes a No. 1 gear, which is fixedly sleeved with the rotating ring, and the interior of the mounting seat is rotatably connected to a No. 2 gear that matches the No. 1 gear, and the No. 1 gear and the No. 2 gear are meshed with each other. The bottom of the No. 2 gear is fixedly connected to a connecting shaft, and one end of the connecting shaft is fixedly connected to the connecting seat.

[0010] Preferably, the downward spiral extension directions of the arc-shaped grooves on the outer sides of the two connecting round blocks corresponding to the fiber grating sensor are opposite, so that the rotation trends of the two connecting seats corresponding to the fiber grating sensor are opposite.

[0011] Preferably, the number of the arc grooves is set to two and the two arc grooves are symmetrically arranged about the center of the connecting round block, and the number of the movable rods corresponds to the number of the arc grooves.

[0012] Preferably, it also includes an acoustic detection tube, a magnetic sensor, an acceleration sensor and a monitoring camera, the acoustic detection tube is used to detect internal defects of the bridge, the magnetic sensor is used to detect fatigue damage inside the bridge, the acceleration sensor is used to detect vibration of the bridge, and the monitoring camera is used to monitor the displacement of the bridge. The acoustic detection tube, magnetic sensor, acceleration sensor and monitoring camera form a sensor group, and the sensor group and fiber grating sensor transmit the detection results to the data platform, and perform bridge safety analysis and fiber grating sensor self-detection analysis based on the fused data.

[0013] Preferably, a gasket is slidably sleeved on the outer side of the fixing rod, a top rod is fixedly connected to the top of the gasket, top blocks are slidably connected to both sides of the bottom of the mounting seat, and one side of the bottom of the top block is set as an inclined surface adapted to the top rod.

[0014] Preferably, a permanent magnet is fixedly disposed on one side of the top block, and electromagnets cooperating with the permanent magnet are fixedly disposed on both sides of the bottom of the mounting seat, and the acting force between the electromagnet and the corresponding permanent magnet is a repulsive force.

[0015] The present invention has the following beneficial effects: 1. The present invention drives the corresponding rotating ring to move relative to the connecting circular block when the nut is loosened and a gap is generated between the nut and the bridge body through the mounting plate. The rotating ring drives the movable rod to move in the arc groove, so that the rotating ring drives the rotating ring to rotate while moving relatively. The rotating ring cooperates with the No. 1 gear, the No. 2 gear and the connecting shaft to drive the corresponding connecting seat to rotate and drive the fiber optic Bragg grating sensor to deform. The fiber optic Bragg grating sensor performs self-detection of the gap size generated after the nut is loosened through the horizontal deformation, which is convenient for timely maintenance after the nut loosening reaches the rated value.

[0016] 2. The present invention drives the top block to move relative to the top rod through an electromagnet in cooperation with a permanent magnet, so that the top rod cooperates with the nut to lift the top block. After detecting that the looseness of the nut reaches the rated value, the top block drives the mounting plate to fit tightly against the bridge body, and the relative positions of the rotating ring and the connecting round block are reset, so as to stop the self-detection of the looseness of the nut and compensate for the deformation error of the fiber grating sensor caused by the looseness of the nut. At the same time, the detection result of the fiber grating sensor after compensation is compared with that before compensation to further determine the looseness of the nut and ensure the accuracy of the self-detection result. The monitoring result is temporarily calibrated by the compensation amount of the nut looseness, so as to ensure the accuracy and continuity of the continuous monitoring result before subsequent manual maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a connection diagram of the device of the present invention; Figure 3 This is a structural schematic diagram of the fixing rod of the present invention; Figure 4 This is a schematic cross-sectional view of the structure of the connection round block of the present invention; Figure 5 This is a schematic diagram of the structure of the arc groove of the present invention; Figure 6 It is a schematic cross-sectional view of the structure of the second gear of the present invention; Figure 7 It is a schematic cross-sectional view of the structure of the electromagnet of the present invention; Figure 8 It is a schematic diagram of the structure of the connecting round blocks of the present invention.

[0018] In the figure: 1. mounting base; 2. fiber grating sensor; 3. bridge body; 4. connecting base; 5. nut; 6. fixing rod; 7. connecting plate; 8. gasket; 9. connecting round block; 10. rotating ring; 11. movable rod; 12. gear No. 1; 13. gear No. 2; 14. arc groove; 15. connecting shaft; 16. push rod; 17. push block; 18. electromagnet; 19. permanent magnet. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0020] See also Figure 1-Figure 6 and Figure 8 A bridge safety warning device includes a fiber grating sensor 2. Both sides of the fiber grating sensor 2 are fixedly sleeved with a connecting seat 4 for fixing the fiber grating sensor 2. The top of the connecting seat 4 is rotatably connected with a mounting seat 1. The fiber grating sensor 2 at least detects the strain of the bridge. The fiber grating sensor 2 can also monitor the vibration and temperature of the bridge. The number of fiber grating sensors 2 arranged is several, and the several fiber grating sensors 2 are evenly spaced in the length and width directions of the bridge. The several fiber grating sensors 2 in the width direction of the bridge are connected in series through optical fibers. The fiber grating sensor 2 is connected to a controller through a decoder, and the fiber grating sensor 2 transmits the detected bridge deformation to the controller.

[0021] Both sides of the mounting seat 1 are movably sleeved with fixing rods 6 for fixing the mounting seat 1 on the bridge body 3. The top of the fixing rod 6 is fixedly sleeved in the bridge body 3. The fixing rod 6 can be set as a screw of an expansion bolt. The fixing rod 6 can also be set as a threaded rod. In this case, a fixed filler is filled between the threaded rod and the bridge body 3. The bottom thread sleeve of the fixing rod 6 is provided with a nut 5. Two groups of fixing rods 6 cooperate with the nut 5 to lock the mounting seat 1 at the bottom of the bridge body 3. The top of the mounting seat 1 is movably connected with a connecting plate 7, and the connecting plate 7 is connected to the two fixing rods 6. Fixed sleeve, a connecting round block 9 is fixedly connected at the midpoint of the bottom surface of the connecting plate 7, and a rotating ring 10 is rotatably connected to the top of the mounting seat 1 through a bearing. An arc groove 14 is provided on the outer side of the connecting round block 9, and a movable rod 11 adapted to the arc groove 14 is fixedly connected to the inner side of the rotating ring 10, and one end of the movable rod 11 is embedded in the groove of the arc groove 14. The number of the arc grooves 14 is set to two and the two arc grooves 14 are symmetrically arranged about the center of the connecting round block 9, and the number of the movable rods 11 corresponds to the number of the arc grooves 14.

[0022] When the nut 5 becomes loose during long-term use, the distance between the nut 5 and the bridge body 3 increases, and it is easy for the mounting seat 1 to be only partially in contact with the bridge body 3 or the mounting seat 1 to be out of contact with the bridge body 3. At this time, the fixed rod 6 is fixed in relative position to the bridge body 3, and the mounting seat 1 drives the rotating ring 10 to move away from the bridge body 3 relative to the connecting round block 9 and descend in the axial direction of the rotating ring 10. The rotating ring 10 drives the movable rod 11 to move relative to the connecting round block 9. The movable rod 11 moves along the arc groove 14 during the descent process to drive the rotating ring 10 to rotate. The outer side of the rotating ring 10 is fixedly sleeved with a No. 1 gear 12, and the inner side of the mounting seat 1 is rotatably connected with a No. 2 gear that matches the No. 1 gear 12. The gear 13, the first gear 12 and the second gear 13 are meshed with each other, the bottom of the second gear 13 is fixedly connected with a connecting shaft 15, one end of the connecting shaft 15 is fixedly connected to the connecting seat 4, the rotating ring 10 rotates to drive the first gear 12 to rotate, the first gear 12 drives the second gear 13 to rotate, and the second gear 13 drives the connecting shaft 15 to rotate, thereby driving the connecting seat 4 to have a tendency to rotate, and the arc grooves 14 on the outer sides of the two connecting round blocks 9 corresponding to the fiber grating sensor 2 spirally extend downward in opposite directions, so that the connecting seats 4 on both sides of the fiber grating sensor 2 have a tendency to rotate in opposite directions, thereby causing the fiber grating sensor 2 to produce a certain deformation in the horizontal direction.

[0023] When the loosening of the nut 5 causes the distance between the nut 5 and the bridge body 3 to reach the rated value, the fiber grating sensor 2 can detect the amount of loosening of the nut 5 through deformation in the horizontal direction. The fiber grating sensor 2 and the sensor group upload fusion data to the data platform through the controller. It is determined whether the nut 5 is loose based on the error of the fiber grating sensor 2 being greater than the rated value, and the detection function of the fiber grating sensor 2 is used to complete the self-inspection of the loose state of the nut 5.

[0024] The sensor group includes an acoustic detection tube, a magnetic sensor, an acceleration sensor and a monitoring camera for detecting internal defects of the bridge. The magnetic sensor is used to detect fatigue damage inside the bridge, the acceleration sensor is used to detect vibration of the bridge, and the monitoring camera is used to monitor the displacement of the bridge. The sensor group transmits the monitoring data and the fiber grating sensor 2 to the data platform through the controller wirelessly for data fusion and analysis to monitor the safety status of the bridge. When the data platform calculates and finds that the bridge structure is damaged or destroyed, the information is fed back to the controller, and the controller controls the alarm to sound an alarm. The controller is connected to the solar power supply device, and the solar power supply device is used to power the sensor group and the fiber grating sensor 2. Example

[0025] See also Figure 1 , Figure 4-Figure 8On the basis of the first embodiment, a gasket 8 is provided on the outer sliding sleeve of the fixing rod 6, and the gasket 8 is located between the nut 5 and the mounting seat 1, and the gasket 8 can slide relative to the fixing rod 6, and a top rod 16 is fixedly connected to the top of the gasket 8, and the top rod 16 is embedded in the mounting seat 1, and both sides of the bottom of the mounting seat 1 are slidably connected with a top block 17, and one side of the bottom of the top block 17 is set as an inclined surface adapted to the top rod 16, and one end of the top rod 16 is in contact with the inclined surface of the top block 17, and a permanent magnet 19 is fixedly provided on one side of the top block 17, and an electromagnet 18 cooperating with the permanent magnet 19 is fixedly provided on both sides of the bottom of the mounting seat 1, and the acting force between the electromagnet 18 and the corresponding permanent magnet 19 is a repulsive force. When the looseness of the nut 5 is greater than the rated value, the fiber grating sensor 2 detects that the nut 5 is loose. At this time, the controller controls the electromagnet 18 to start, and the electromagnet 18 cooperates with the permanent magnet 19 to drive the top block 17 to move, and the inclined surface of the top block 17 presses against The push rod 16 is held, and the push rod 16 pushes the push block 17 that moves relative to the push rod 16 to rise. The rise of the push block 17 drives the mounting seat 1 to move the looseness of the compensation nut 5, so that the mounting seat 1 maintains the fit with the bridge body 3. At this time, the relative position of the connecting round block 9 and the rotating ring 10 is reset and fixed, and the data detected by the fiber grating sensor 2 is compared with the monitoring data of the compensation nut 5 to further determine whether the detection error is caused by the looseness of the nut 5, further ensure the accuracy of the self-detection looseness of the nut 5, and provide compensation for the looseness of the nut 5. Before subsequent manual inspection and maintenance, a temporary mounting seat 1 offset calibration is provided to ensure the continuity of the monitoring work.

[0026] The method of use (working principle) of the present invention is as follows: When the nut 5 is loosened, the distance between the nut 5 and the bridge body 3 increases, and the gap between the mounting seat 1 and the bridge body 3 increases, causing the error of the fiber grating sensor 2 in the vertical direction to increase. At this time, the mounting seat 1 drives the rotating ring 10 to move relative to the connecting round block 9, and the rotating ring 10 drives the movable rod 11 to move along the arc groove 14. The movable rod 11 cooperates with the arc groove 14 to drive the rotating ring 10 to rotate, and the rotating ring 10 cooperates with the first gear 12 and the second gear 13 to drive the corresponding connecting seat 4 to rotate, thereby driving the fiber grating sensor 2 to produce horizontal deformation. After the fiber grating sensor 2 detects that the looseness of the nut 5 reaches the rated value, the controller controls the electromagnet 18 to start, cooperate with the permanent magnet 19 and the top block 17, so that the top rod 16 pushes the relatively moving top block 17 to rise, so that the mounting seat 1 is close to the bridge body 3, providing temporary compensation for the looseness of the nut 5, and the top block 17 rises to reset the connecting round block 9 and the rotating ring 10. Further comparison is performed through the compensated detection data to ensure the accuracy of the self-detection result.

Claims

1. A bridge safety warning device, comprising a fiber grating sensor (2), characterized in that: Both sides of the fiber grating sensor (2) are fixedly sleeved with a connecting seat (4) for fixing the fiber grating sensor (2), the top of the connecting seat (4) is rotatably connected to a mounting seat (1), both sides of the mounting seat (1) are movably sleeved with a fixing rod (6), and the bottom of the fixing rod (6) is threadedly sleeved with a nut (5); The top of the mounting seat (1) is movably connected to a connecting plate (7), and a conducting mechanism is arranged inside the mounting seat (1). The conducting mechanism can drive the mounting seat (1) to rotate according to the relative movement distance between the connecting plate (7) and the mounting seat (1), so that the fiber optic Bragg grating sensor (2) generates a corresponding horizontal deformation amount for self-detection, and judges whether the looseness of the nut (5) is greater than a rated value according to the result of the self-detection of the fiber optic Bragg grating sensor (2).

2. A bridge safety early warning device according to claim 1, characterized in that: The fiber grating sensors (2) are arranged in a plurality and the plurality of fiber grating sensors (2) are evenly spaced in the length and width directions of the bridge, and the plurality of fiber grating sensors (2) in the width direction of the bridge are connected to each other in series via optical fibers.

3. A bridge safety early warning device according to claim 1, characterized in that: The transmission mechanism comprises a connecting round block (9), wherein the connecting round block (9) is fixedly connected to the connecting plate (7); the top of the mounting seat (1) is rotatably connected to a rotating ring (10) via a bearing; an arc groove (14) is provided on the outer side of the connecting round block (9); a movable rod (11) adapted to the arc groove (14) is fixedly connected to the inner side of the rotating ring (10); when the rotating ring (10) moves axially relative to the connecting round block (9), the arc groove (14) drives the movable rod (11) to rotate.

4. A bridge safety early warning device according to claim 3, characterized in that: The transmission mechanism further comprises a first gear (12), the first gear (12) being fixedly sleeved with the rotating ring (10), a second gear (13) adapted to the first gear (12) being rotatably connected inside the mounting seat (1), the first gear (12) and the second gear (13) being meshed with each other, a connecting shaft (15) being fixedly connected to the bottom of the second gear (13), one end of the connecting shaft (15) being fixedly connected to the connecting seat (4).

5. A bridge safety early warning device according to claim 3, characterized in that: The downward spiral extension directions of the arc-shaped grooves (14) on the outer sides of the two connecting round blocks (9) corresponding to the fiber optic Bragg grating sensor (2) are opposite, so that the rotation trends of the two connecting seats (4) corresponding to the fiber optic Bragg grating sensor (2) are opposite.

6. A bridge safety early warning device according to claim 1, characterized in that: The number of the arc-shaped grooves (14) is set to two, and the two arc-shaped grooves (14) are symmetrically arranged about the center of the connecting round block (9), and the number of the movable rods (11) corresponds to the number of the arc-shaped grooves (14).

7. A bridge safety early warning device according to claim 1, characterized in that: It also includes an acoustic detection tube, a magnetic sensor, an acceleration sensor and a monitoring camera. The acoustic detection tube is used to detect internal defects of the bridge, the magnetic sensor is used to detect fatigue damage inside the bridge, the acceleration sensor is used to detect vibration of the bridge, and the monitoring camera is used to monitor the displacement of the bridge. The acoustic detection tube, the magnetic sensor, the acceleration sensor and the monitoring camera form a sensor group. The sensor group and the fiber optic Bragg grating sensor (2) transmit the detection results to the data platform, and the bridge safety analysis and the fiber optic Bragg grating sensor (2) self-detection analysis are performed based on the fused data.

8. A bridge safety early warning device according to claim 1, characterized in that: A gasket (8) is slidably sleeved on the outer side of the fixing rod (6), a top rod (16) is fixedly connected to the top of the gasket (8), and top blocks (17) are slidably connected to both sides of the inner bottom of the mounting seat (1), and one side of the bottom of the top block (17) is arranged as an inclined surface adapted to the top rod (16).

9. A bridge safety early warning device according to claim 8, characterized in that: A permanent magnet (19) is fixedly disposed on one side of the top block (17), and electromagnets (18) cooperating with the permanent magnet (19) are fixedly disposed on both sides of the bottom of the mounting seat (1), wherein the acting force between the electromagnet (18) and the corresponding permanent magnet (19) is a repulsive force.

Images