Bridge safety early warning component and early warning method based on tension and compression stress monitoring

Abstract

The application discloses a bridge safety early warning component and early warning method based on tension and compression stress monitoring, and belongs to the technical field of highway bridge monitoring. The component comprises a support, a tension and compression stress light-emitting sheet fixed on one side of the support and a photosensitive sensor. The support is connected to a stress monitoring part of a bridge. A cylindrical boss is fixedly arranged on the support. A cylindrical groove is formed in the bottom of the cylindrical boss in the axial direction. A sliding ring is slidably arranged in the cylindrical groove. A plurality of sliding holes are uniformly distributed in the annular cylindrical boss. A jack rod is slidably and fitly arranged in the sliding hole. The outer end of the jack rod extends out of the sliding hole. The inner end of the jack rod abuts against one end surface of the sliding ring. A first elastic support device is arranged between the sliding ring and the support. A guide rod is fixed to the other end surface of the sliding ring. The guide rod is slid through the support and is connected to the tension and compression stress light-emitting sheet through a transmission assembly. The application can realize real-time monitoring on the detection part of the bridge, and the reaction of the bridge structure state is more intuitive, the monitoring is timely, and the monitoring result is more accurate.

Description

Technical Field

[0001] This invention belongs to the field of highway bridge monitoring technology, specifically relating to a bridge safety early warning component and method based on tensile and compressive stress monitoring. Background Technology

[0002] The operational performance of bridges not only relates to the safety and durability of the structure itself, but also has a crucial impact on the operational stability and safety of related railway lines. Assessing the performance status of a bridge often requires structural inspection. In addition to routine visual inspections, bridge inspections also require periodic further checks on the bridge's technical condition. Unlike visual inspections, this type of inspection must be carried out by professional technicians using specialized testing equipment. It demands the application of non-destructive testing methods to conduct a comprehensive inspection of the bridge, meticulously recording data, identifying the location and extent of damage, and accurately assessing the potential consequences of the damage, as well as the bridge's durability and load-bearing capacity. However, existing inspection and monitoring methods suffer from problems such as unintuitive structural condition assessments, untimely monitoring, and inaccurate results. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a bridge safety early warning component and method based on tensile and compressive stress monitoring, which can monitor the detection parts of the bridge in real time, so as to solve the above-mentioned technical problems.

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

[0005] This invention discloses a bridge safety early warning component based on tensile and compressive stress monitoring, comprising a bracket, a tensile and compressive stress luminescent sheet fixed to one side of the bracket, and a photosensitive sensor. The photosensitive sensor is used to monitor the luminescence of the tensile and compressive stress luminescent sheet. The bracket is connected to the stress monitoring part of the bridge. A cylindrical boss is fixedly provided on the bracket. A cylindrical groove is formed along the axial direction at the bottom of the cylindrical boss. A slip ring is slidably disposed in the cylindrical groove. A plurality of sliding holes are evenly distributed in a ring on the cylindrical boss. A push rod is slidably disposed in the sliding holes. The outer end of the push rod extends outward from the sliding hole. The inner end of the push rod abuts against one end face of the slip ring. A first elastic support device is provided between the slip ring and the bracket. A guide rod is fixed to the other end face of the slip ring. The guide rod slides through the bracket and is connected to the tensile and compressive stress luminescent sheet through a transmission component.

[0006] Furthermore, the transmission assembly includes a first swing arm, a first support, a second swing arm, a second support, a third swing arm, a third support, a fourth swing arm, a fourth support, a slide rod, a slide block, and an L-shaped connecting plate. The first support, the second support, the third support, and the fourth support are respectively used to support the middle parts of the first swing arm, the second swing arm, the third swing arm, and the fourth swing arm. The guide rod slides through the bracket and abuts against one end of the first swing arm. The other end of the first swing arm abuts against one end of the second swing arm. The other end of the second swing arm abuts against one end of the third swing arm. The other end of the third swing arm abuts against one end of the fourth swing arm. The other end of the fourth swing arm abuts against the slide rod. The slide rod slides through the slide block and is connected to the tensile and compressive stress light-emitting sheet through the L-shaped connecting plate. The slide block is fixed on the bracket. The power arm of the first swing arm, the third swing arm, and the fourth swing arm is smaller than the resistance arm. The power arm of the second swing arm is equal to the resistance arm.

[0007] Furthermore, an end plate is fixed to the end of the slide rod, and the slide rod abuts against the fourth swing arm through the end plate. A second elastic support device is provided between the end plate and the slide block.

[0008] Furthermore, the L-shaped connecting plate includes a horizontal plate and a vertical plate that is combined with the horizontal plate to form an L-shape. One end of the horizontal plate is connected to a sliding rod, and the other end of the horizontal plate is connected to the vertical plate. The vertical plate is connected to a tensile and compressive stress light-emitting sheet.

[0009] Furthermore, a rack is slidably mounted on the vertical side of the bracket, and a photosensitive sensor is fixedly connected to the rack. The rack meshes with a gear, which is driven by a motor, which is fixed to the bracket.

[0010] Furthermore, anchor rods are connected to the support.

[0011] Furthermore, the cylindrical boss includes a boss body and a cylindrical limiting block threadedly connected to the inner side of the boss body. The sliding hole is opened on the cylindrical limiting block, and a stop block for limiting the push rod is detachably connected to the cylindrical limiting block.

[0012] Furthermore, the slip ring has a through groove for the push rod to pass through, the lower part of the push rod is threadedly connected to a limit plate, a pressure ring is provided between the limit plate and the slip ring, the pressure ring has a through hole for the push rod to pass through, and the pressure ring and the limit plate are magnetically connected.

[0013] Furthermore, each through groove is arranged on a concentric circle with the center of the slip ring as the center, and a rotating rod is fixedly connected to the cylindrical limiting block, the rotating rod sliding through the bracket.

[0014] A bridge safety early warning method based on tensile and compressive stress monitoring includes the following steps:

[0015] 1) Install early warning components at the locations of the bridge structure to be evaluated, wherein the early warning components are any of the safety early warning components described above;

[0016] 2) Monitor the luminous brightness of the light-emitting sheet under tension and compression stress by installing a photosensitive sensor;

[0017] 3) Establish the relationship between the brightness change of the luminescent material and the tensile stress at the monitoring point;

[0018] 4) Conduct a safety assessment of the bridge structure or components based on the monitored tensile and compressive stress values ​​and the number of times they were monitored;

[0019] 5) Provide early warning results for structures or components with poor safety performance.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention discloses a bridge safety early warning component based on tensile and compressive stress monitoring. It utilizes a tensile and compressive stress-emitting luminescent sheet made of a tensile and compressive stress-emitting polymer material. When the area to be monitored is subjected to tensile and compressive stress, the stretched area can transfer the tension to the luminescent sheet via a transmission component. The luminescent polymer fluoresces under ultraviolet light, and the light intensity is monitored by a photosensitive sensor. The more the material is stretched, the brighter the light emission; once the stretching is relaxed, it returns to its original state under its own elastic force and stops emitting light. Therefore, this method allows the brightness of the material's light emission to correspond to the stress at the material's location, and can count the number of times stress exceeds the limit, thereby assessing the operational performance of the bridge structure. Using this invention, the response to the bridge structural condition is more intuitive, the monitoring is more timely, and the monitoring results are more accurate.

[0022] In the early warning component of this invention, a top rod is provided. The upper end of the top rod can contact the surface of the bridge to be inspected. Therefore, the strain of the bridge can drive the displacement of the top rod, causing it to act on the guide rod and, through the transmission component, on the tensile and compressive stress luminescent sheet, thus transmitting stress. By setting multiple sets of top rods, tensile and compressive stress at multiple points can be detected, resulting in better monitoring. Furthermore, the simultaneous transmission of stress through a single guide rod by multiple sets of top rods simplifies the structure.

[0023] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0024] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0025] Figure 1This is a structural schematic diagram of the safety warning component of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the boss body of the present invention;

[0027] Figure 3 for Figure 2 Enlarged view at point A;

[0028] Figure 4 This is a schematic diagram of the transmission assembly.

[0029] Figure 5 This is a schematic diagram of the slip ring structure;

[0030] Figure 6 This is a schematic diagram of the pressure ring structure;

[0031] Figure 7 This is a schematic diagram of the installation of the safety warning component of the present invention on a bridge.

[0032] The following components are labeled in the attached diagram: 1. Bracket; 2. Tension-compression stress luminescent sheet; 3. Photosensitive sensor; 4. Columnar boss; 5. Columnar groove; 6. Slip ring; 7. Sliding hole; 8. Top rod; 9. First elastic support device; 10. Guide rod; 11. First swing arm; 12. First support; 13. Second swing arm; 14. Second support; 15. Third support; 16. Fourth swing arm; 17. Fourth support; 18. Sliding rod; 19. Sliding seat; 20. L-shaped connecting plate; 21. End plate; 22. Second elastic support device; 23. Rack; 24. Gear; 25. Motor; 26. Anchor rod; 27. Boss body; 28. Columnar limiting block; 29. ​​Stop block; 30. Through groove; 31. Limiting plate; 32. Pressure ring; 33. Through hole; 34. Rotating rod; 35. Detailed Implementation

[0033] like Figures 1-7 As shown, this invention discloses a bridge safety early warning component based on tensile and compressive stress monitoring, comprising a bracket 1, a tensile and compressive stress emitting sheet 2 fixed to one side of the bracket 1, and a photosensitive sensor 3. The bracket 1 is mainly used to fix the device to the part of the bridge to be monitored. Both the tensile and compressive stress emitting sheet 2 and the photosensitive sensor 3 are mounted on the bracket 1, and the photosensitive sensor 3 is used to monitor the emitting status of the tensile and compressive stress emitting sheet 2.

[0034] Specifically, bracket 1 is connected to the stress monitoring section of the bridge and is mainly used for installation at the bottom of the main beam or other stress-bearing parts of the bridge. After installation, the upper surface of bracket 1 is parallel to the horizontal plane. A cylindrical boss 4 is fixedly installed on bracket 1. The cylindrical boss 4 is cylindrical in shape, and a column groove 5 is opened axially at the bottom of the cylindrical boss 4. The lower end of the column groove 5 is open, and a slip ring 6 is slidably installed in the column groove 5. The slip ring 6 can be vertically displaced within the column groove 5. Several sliding holes 7 are evenly distributed in a ring on the cylindrical boss 4. The sliding holes 7 are vertical, and a top rod 8 is slidably installed in the sliding holes 7. The outer end of the top rod 8 extends outward from the sliding hole 7 and contacts the specific part of the bridge that needs to be monitored. The inner end of the top rod 8 abuts against one end face of the slip ring 6. A first elastic support device 9 is provided between the slip ring 6 and bracket 1 to provide a portion of the elastic restoring force. The other end face of the slip ring 6 is fixed with a guide rod 10. The present invention has three guide rods 10, one of which slides through the bracket 1 and is connected to the tensile and compressive stress light-emitting sheet 2 through the transmission assembly.

[0035] When the part of the bridge to be monitored deforms, the deformed part acts on the upper end of the top rod 8, which drives the slip ring 6 and the guide rod 10 to move. After the guide rod 10 moves, it pulls the tensile and compressive stress light-emitting sheet 2 through the transmission component to deform it. The light-emitting polymer on the tensile and compressive stress light-emitting sheet 2 can fluoresce under ultraviolet light, and the light intensity can be monitored by the photosensitive sensor 3.

[0036] In this embodiment, the transmission assembly includes a first swing arm 11, a first support 12, a second swing arm 13, a second support 14, a third swing arm 15, a third support 16, a fourth swing arm 17, a fourth support 18, a slide rod 19, a slide block 20, and an LL-type connecting plate 21. The first support 12, the second support 14, the third support 16, and the fourth support 18 are respectively used to support the middle parts of the first swing arm 11, the second swing arm 13, the third swing arm 15, and the fourth swing arm 17. The fulcrums of the first support 12 and the third support 16 are in the same plane, and the fulcrums of the second support 14 and the fourth support 18 are in the same plane. The guide rod 19... After sliding through the bracket 1, the first swing arm 11 abuts against one end of the first swing arm 11. The other end of the first swing arm 11 abuts against one end of the second swing arm 13. The other end of the second swing arm 13 abuts against one end of the third swing arm 15. The other end of the third swing arm 15 abuts against one end of the fourth swing arm 17. The other end of the fourth swing arm 17 abuts against the slide rod 19. The slide rod 19 slides through the slide seat 20 and is connected to the tension and compression stress light-emitting sheet 2 through the LL-type connecting plate 21. The slide seat 20 is fixed on the bracket 1. The power arms of the first swing arm 11, the third swing arm 15, and the fourth swing arm 17 are all smaller than the resistance arms. The power arm of the second swing arm 13 is equal to the resistance arm.

[0037] Specifically, the first swing arm 11 has a power arm length of 80mm and a resistance arm length of 200mm; the second swing arm 13 has a power arm and a resistance arm length of 106mm each; the third swing arm 15 has a power arm length of 100mm and a resistance arm length of 350mm; and the fourth swing arm 17 has a power arm length of 83mm and a resistance arm length of 117.5mm. By setting up the transmission components, the transmission torque can be amplified, the deformation of the tensile and compressive stress light-emitting sheet 2 can be increased, and the monitoring of the photosensitive sensor 3 can be made more sensitive.

[0038] In this embodiment, an end plate 22 is fixed to the end of the slide rod 19. The slide rod 19 abuts against the fourth swing arm 17 through the end plate 22. A second elastic support device 23 is provided between the end plate 22 and the slide seat 20, which can provide elastic support for the slide rod 19. The first elastic support device 9 and the second elastic support device 23 of this invention are both springs, or other elastic components used for recovery.

[0039] In this embodiment, the LL-type connecting plate 21 includes a horizontal plate and a vertical plate that is combined with the horizontal plate to form an L-shape. One end of the horizontal plate is connected to the slide rod 19, and the other end of the horizontal plate is connected to the vertical plate. The vertical plate is connected to the tensile and compressive stress light-emitting sheet 2.

[0040] In this embodiment, a rack 24 is slidably mounted on the support 1 along its vertical axis. The photosensitive sensor 3 is fixedly connected to the rack 24. The rack 24 meshes with a gear 25, which is driven by a motor 26. The motor 26 is fixed on the support 1. By driving and controlling the motor 26, the vertical position of the photosensitive sensor 3 can be adjusted so that it can better correspond to the position of the tensile and compressive stress light-emitting sheet 2, facilitating monitoring.

[0041] In this embodiment, the support 1 is connected to the anchor rod 27, which facilitates connection with the bridge.

[0042] In this embodiment, the cylindrical boss 4 includes a boss body 28 and a cylindrical limiting block 29 threadedly connected to the inner side of the boss body 28. A sliding hole 7 is opened on the cylindrical limiting block 29, and a stop block 30 for limiting the push rod 8 is detachably connected to the cylindrical limiting block 29.

[0043] In this embodiment, the slip ring 6 has a through groove 31 for the push rod 8 to pass through, the lower part of the push rod 8 is threadedly connected to a limiting plate 32, a pressure ring 33 is provided between the limiting plate 32 and the slip ring 6, the pressure ring 33 has a through hole 34 for the push rod 8 to pass through, and the pressure ring 33 is magnetically connected to the limiting plate 32.

[0044] In this embodiment, each through groove 31 is arranged on a concentric circle with the center of the slip ring 6 as the center. A rotating rod 35 is fixedly connected to the cylindrical limiting block 29, and the rotating rod 35 slides through the bracket 1. When the equipment is being debugged, the guide rod 10 can be pulled down to disengage the slip ring 6 from the top rod 8. At this time, the cylindrical limiting block 29 can be rotated by the rotating rod 35 to adjust the position of the cylindrical limiting block 29 within the boss body 28, so that each top rod 8 can contact the part of the bridge to be monitored. Of course, by rotating the limiting plate 32, the position of the limiting plate 32 on a single top rod 8 can be adjusted, so that the extension position of the top rod 8 can also be adjusted individually, which can adapt to the monitoring of different inclined surfaces.

[0045] A bridge safety early warning method based on tensile and compressive stress monitoring includes the following steps:

[0046] 1) Install early warning components at the locations of the bridge structure to be evaluated. The early warning components shall be any of the safety early warning components mentioned above.

[0047] 2) Monitor the luminous brightness of the tensile and compressive stress luminescent sheet 2 by installing a photosensitive sensor 3;

[0048] 3) Establish the relationship between the brightness change of the luminescent material and the tensile stress at the monitoring point;

[0049] 4) Conduct a safety assessment of the bridge structure or components based on the monitored tensile and compressive stress values ​​and the number of times they were monitored;

[0050] 5) Provide early warning results for structures or components with poor safety performance.

[0051] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A bridge safety early warning component based on tensile and compressive stress monitoring, characterized in that: The system includes a bracket, a tensile / compressive stress-emitting sheet fixed to one side of the bracket, and a photosensitive sensor. The photosensitive sensor is used to monitor the luminescence of the tensile / compressive stress-emitting sheet. The bracket is connected to the stress monitoring section of the bridge. A cylindrical boss is fixedly installed on the bracket. A cylindrical groove is formed along the axial direction at the bottom of the cylindrical boss. A slip ring is slidably installed in the groove. Several sliding holes are evenly distributed in a ring on the cylindrical boss. A push rod is slidably fitted in each sliding hole. The outer end of the push rod extends outward from the sliding hole, and the inner end of the push rod abuts against one end face of the slip ring. A first elastic support device is provided between the slip ring and the bracket. A guide rod is fixed to the other end face of the slip ring. The guide rod slides through the bracket and is connected to the tensile / compressive stress-emitting sheet via a transmission assembly. The transmission assembly includes a first swing arm, a first support, a second swing arm, a second support, a third swing arm, a third support, a fourth swing arm, a fourth support, a slide rod, a slide seat, and an L-shaped connecting plate. The first support, the second support, the third support, and the fourth support are respectively used to support the first swing arm, the second support, the third support, and the fourth support. The second, third, and fourth swing arms are supported in the middle. The guide rod slides through the bracket and abuts against one end of the first swing arm. The other end of the first swing arm abuts against one end of the second swing arm, the other end of the second swing arm abuts against one end of the third swing arm, the other end of the third swing arm abuts against one end of the fourth swing arm, and the other end of the fourth swing arm abuts against the slide rod. The slide rod slides through the slide block and is connected to the tensile and compressive stress light-emitting sheet through an L-shaped connecting plate. The slide block is fixed on the bracket. The first swing arm, The power arms of the third and fourth swing arms are both smaller than the resistance arms, while the power arm of the second swing arm is equal to the resistance arm. An end plate is fixed to the end of the slide rod, which abuts against the fourth swing arm via this end plate. A second elastic support device is provided between the end plate and the slide block. The L-shaped connecting plate includes a horizontal plate and a vertical plate that forms an L-shape with the horizontal plate. One end of the horizontal plate is connected to the slide rod, and the other end is connected to the vertical plate. The vertical plate is connected to the tensile / compressive stress luminescent sheet. An anchor rod is connected to the bracket.

2. A bridge safety early warning component based on tensile and compressive stress monitoring according to claim 1, characterized in that: A rack is vertically slidably mounted on the bracket. A photosensitive sensor is fixedly connected to the rack. The rack meshes with a gear, which is driven by a motor, which is fixed to the bracket.

3. A bridge safety early warning component based on tensile and compressive stress monitoring according to any one of claims 1-2, characterized in that: The cylindrical boss includes a boss body and a cylindrical limiting block threadedly connected to the inside of the boss body. The sliding hole is opened on the cylindrical limiting block, and a stop block for limiting the push rod is detachably connected to the cylindrical limiting block.

4. A bridge safety early warning component based on tensile and compressive stress monitoring according to claim 3, characterized in that: The slip ring has a through groove for the push rod to pass through. The lower part of the push rod is threadedly connected to a limiting plate. A pressure ring is provided between the limiting plate and the slip ring. The pressure ring has a through hole for the push rod to pass through. The pressure ring and the limiting plate are magnetically connected.

5. A bridge safety early warning component based on tensile and compressive stress monitoring according to claim 4, characterized in that: Each through groove is arranged on a concentric circle with the center of the slip ring as the center. A rotating rod is fixedly connected to the cylindrical limiting block, and the rotating rod slides through the bracket.

6. A bridge safety early warning method based on tensile and compressive stress monitoring, characterized in that: Includes the following steps: 1) Install a warning component at the location of the bridge structure to be evaluated, wherein the warning component is a safety warning component as described in any one of claims 1-5; 2) Monitor the luminous brightness of the light-emitting sheet under tension and compression stress by installing a photosensitive sensor; 3) Establish the relationship between the brightness change of the luminescent material and the tensile stress at the monitoring point; 4) Conduct a safety assessment of the bridge structure or components based on the monitored tensile and compressive stress values ​​and the number of times they were monitored; 5) Provide early warning results for structures or components with poor safety performance.

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