A concrete bridge bottom surface crack detection device

Abstract

The application discloses a concrete bridge bottom surface crack detection device and belongs to the technical field of bridge detection. The device comprises a cross beam, a rolling support structure for supporting the cross beam, a first support beam and a second support beam arranged at two ends of the cross beam respectively, linear detection assemblies installed on horizontal beams of the first support beam and the second support beam, and arc-shaped detection assemblies installed at inner ends of the horizontal beams. The arc-shaped detection assembly comprises a torsion reset device, a semicircular support frame, a sliding seat, a first driving assembly and a first crack detector. The middle part of the semicircular support frame is connected to the horizontal beam through the torsion reset device. The first crack detector is installed on the sliding seat. The sliding seat can slide along the circumference of the semicircular support frame through the first driving assembly. The arc-shaped detection assemblies on the first support beam and the second support beam are vertically staggered with each other. The device can detect the bottom surface of the bridge in all directions and can continuously work to avoid the influence of the interference of the bridge pier.

Description

Technical Field

[0001] This invention belongs to the field of bridge inspection technology, specifically relating to a device for detecting cracks on the bottom surface of concrete bridges. Background Technology

[0002] Over 90% of damage to concrete bridges is caused by cracks. Some cracks, under the influence of service loads or external physical and chemical factors, continuously generate and expand new cracks, forming through cracks and deep cracks. These create mechanical discontinuities within the bridge, significantly reducing its load-bearing capacity and, in severe cases, even leading to collapse and jeopardizing the normal use of the bridge structure. If cracks are not detected and treated promptly, they can cause significant loss of life and property. Cracks on the bridge's underside are often difficult to detect and are generally more likely to cause accidents.

[0003] Existing technologies include several devices for detecting cracks on the underside of bridges. For example, CN214583107U discloses a device for detecting cracks on the underside of concrete bridges. This device controls the rotation of a lead screw, which in turn drives a linear slider to move linearly along a linear optical axis. This allows the crack detection instrument to move left and right along the underside of the bridge for crack detection. However, the problem with this device is that it cannot avoid the bridge piers at the bottom of the bridge when moving longitudinally along the bridge, which hinders the continuous operation of the device. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a device for detecting cracks on the bottom surface of concrete bridges, which can perform all-round detection on the bottom surface of the bridge and can work continuously to avoid the influence of interference from bridge piers.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention discloses a device for detecting cracks on the bottom surface of a concrete bridge, comprising a crossbeam, a rolling support structure for supporting the crossbeam, and a first support beam and a second support beam respectively disposed at both ends of the crossbeam. Each of the first and second support beams includes a vertical beam and an L-shaped horizontal beam connected to the vertical beam. The upper end of the vertical beam is fixedly connected to the lower side of the crossbeam. One end of the horizontal beam is fixedly connected to the vertical beam, and the other end of the horizontal beam extends towards the side where the center section of the crossbeam is located. A straight detection component is installed on the horizontal beam of both the first and second support beams, and an arc-shaped detection component is installed at the inner end of the horizontal beam. The arc-shaped detection component includes a torsion reset device, a semi-circular support frame, a slide block, a first drive assembly, and a first crack detector. The middle part of the semi-circular support frame is connected to the horizontal beam via the torsion reset device. The first crack detector is mounted on the slide block, which is driven by the first drive assembly to slide circumferentially along the semi-circular support frame. The arc-shaped detection components on the first and second support beams are vertically staggered.

[0007] Furthermore, a second guide rail is slidably provided on the inner side of the semi-circular support frame, and a second drive assembly for controlling the second guide rail to slide along the semi-circular support frame is provided on the semi-circular support frame. A first guide rail is fixedly connected to the upper surface of the second guide rail through a vertical support column. The first guide rail is slidably engaged with the slide block, and the first drive assembly is mounted on the slide block.

[0008] Furthermore, the outer side of the first guide rail is provided with a first outer gear tooth, the first drive assembly includes a first roller bracket fixed to the bottom of the slide and a first roller rotatably connected to the first roller bracket, the upper side of the first guide rail is provided with an arc-shaped groove that cooperates with the first roller, a first motor is fixed on the slide, the output end of the first motor is connected to a first gear, and the first gear meshes with the first outer gear tooth.

[0009] Furthermore, the outer side of the second guide rail is provided with a second outer gear tooth, and the second drive assembly includes a second motor fixedly connected to the semi-circular support frame. The output end of the second motor is connected to a second gear, and the second gear meshes with the second outer gear tooth.

[0010] Furthermore, the torsion reset device includes a stepped shaft and a reset coil spring. The center of the semi-circular support frame has a stepped hole that mates with the stepped shaft. The semi-circular support frame is rotatably connected to the horizontal beam through the stepped shaft. A reset coil spring is sleeved on the outer side of the stepped shaft. The two connecting ends of the reset coil spring are respectively connected to the horizontal beam and the semi-circular support frame.

[0011] Furthermore, a groove is provided on the horizontal beam along its length direction. The linear detection assembly includes a third motor, a third gear, a rack, a connecting block, and a second crack detector. The third motor is fixed on the horizontal beam, and the output end of the third motor is connected to the third gear. The third gear meshes with the rack, and the rack slides in the groove. The back side of the rack is connected to the second crack detector through the connecting block.

[0012] Furthermore, the rolling support structure includes a second roller bracket and a second roller. The second roller bracket is fixed to the lower side of the crossbeam, the second roller bracket is rotatably connected to the second roller, and the second roller abuts against the upper surface of the bridge.

[0013] Furthermore, a threaded hole is provided on the vertical beam, and a screw is connected in the threaded hole. One end of the screw is connected to the vertical beam through a nut, and the other end of the screw is fixedly connected to a third roller bracket. The third roller bracket is rotatably connected to the third roller, and the third roller abuts against the side of the bridge.

[0014] Furthermore, the inner side of the semi-circular support frame is connected to a support ring by a spring, and the spring is evenly distributed in the interval between the semi-circular support frame and the support ring.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention discloses a device for detecting cracks on the bottom surface of concrete bridges. The curvature of a semi-circular support frame is set to correspond to the diameter of the bridge pier. The middle part of the semi-circular support frame is connected to a horizontal beam through a torsion reset device. Before contacting the bridge pier, the semi-circular support frame is kept open under the torsional prestress of the torsion reset device to avoid interference between the outer circumference of the semi-circular support frame and the bridge pier when the semi-circular support frame moves longitudinally. When the inner wall of the rear end of the semi-circular support frame contacts the bridge pier, the outer surface of the bridge pier contacts the inner surface of the rear end of the support ring, driving the support ring and the semi-circular support frame connected to it to rotate. As the horizontal beam moves, until the support ring and the bridge pier are completely separated, the support ring and the semi-circular support frame return to their original positions under the action of the torsion reset device, thereby achieving avoidance of the bridge pier.

[0017] The device of this invention has a straight detection component that can detect the two sides of the bottom surface of a bridge, and an arc detection component that can monitor the position of the bottom surface of the bridge near the center section. This device can not only avoid the bridge piers, but also detect cracks in the blind spots around the bridge piers at the bottom of the bridge, making the detection more comprehensive.

[0018] In the device of the present invention, the arc-shaped detection components on the first and second beams are vertically staggered to avoid interference between them.

[0019] 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

[0020] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0021] Figure 1 This is a schematic diagram of the structure of the device of the present invention;

[0022] Figure 2 This is a front view of the device of the present invention;

[0023] Figure 3 This is a schematic diagram of the arc-shaped detection component;

[0024] Figure 4 This is a top view of the arc detection component;

[0025] Figure 5 This is a schematic diagram of the structure of the first guide rail;

[0026] Figure 6 This is a schematic diagram of the straight line detection component;

[0027] Figure 7 This is a schematic diagram illustrating the obstacle avoidance principle of the device of the present invention.

[0028] The following are the markings in the attached diagram: 1. Crossbeam; 2. Rolling support structure; 3. First support beam; 4. Second support beam; 5. Vertical beam; 6. Horizontal beam; 7. Straight line detection assembly; 8. Arc detection assembly; 9. Semi-circular support frame; 10. Slide seat; 11. First drive assembly; 12. First crack detector; 13. Second drive assembly; 14. Vertical support column; 15. First guide rail; 16. First outer gear tooth; 17. First roller bracket; 18. First roller; 19. Arc groove; 20. First motor; 21. First gear; 22. Second outer gear tooth; 23. Second motor; 24. Second gear; 25. Stepped shaft; 26. Return spring; 27. Slide groove; 28. Third motor; 29. ​​Third gear; 30. Rack; 31. Connecting block; 32. Second crack detector; 33. Second roller bracket; 34. Second roller; 35. Threaded hole; 36. Screw; 37. Nut; 38. Third roller bracket; 39. Third roller; 40. Spring; 41. Support ring; 42. Detailed Implementation

[0029] like Figures 1-6As shown, this invention discloses a device for detecting cracks on the bottom surface of a concrete bridge, comprising a crossbeam 1, a rolling support structure 2 for supporting the crossbeam 1, and a first support beam 3 and a second support beam 4 respectively disposed at both ends of the crossbeam 1. With the extension direction of the bridge as the longitudinal direction, the crossbeam 1 is arranged transversely along the bridge. The rolling support structure serves to support the crossbeam 1 on the upper side of the bridge; either rolling or sliding support can be used, ensuring that the crossbeam 1 can move longitudinally along the bridge. This device is used to detect cracks at various locations along the longitudinal direction of the bridge. The first support beam 3 and the second support beam 4 are located at both ends of the crossbeam 1, extending from the upper side of the bridge to the lower side to connect to the detection device. The first support beam 3, the second support beam 4, and the crossbeam 1 are combined in a U-shape.

[0030] Specifically, both the first beam 3 and the second beam 4 include a vertical beam 5 and an L-shaped horizontal beam 6 connected to the vertical beam 5. The vertical beam 5 is arranged vertically, and its upper end is fixedly connected to the lower side of the horizontal beam 1. The horizontal beam 6 is arranged in a horizontal plane, and its extension direction is transverse. One end of the horizontal beam 6 is fixedly connected to the lower end of the vertical beam 5, and the other end of the horizontal beam 6 extends towards the side where the center section of the horizontal beam 1 is located. That is, the horizontal beams 6 of the first beam 3 and the second beam 4 are arranged opposite each other. However, the lengths of the vertical beams 5 of the first beam 3 and the second beam 4 are slightly different to avoid interference. In some other embodiments, the specific structure of the first beam 3 and the second beam 4 can be appropriately modified, the ultimate purpose of which is to serve as a support for the arc-shaped detection component 8 to achieve the balance of the entire device.

[0031] Linear detection components 7 are installed on the horizontal beams 6 of both the first beam 3 and the second beam 4. These components can detect cracks along a straight line on the horizontal beam 6. By longitudinally moving the crossbeam 1, the detection location can be expanded from a line to a surface, as should be understood by those skilled in the art. An arc-shaped detection component 8 is installed at the inner end of the horizontal beam 6, located on the inner side of the bridge. The arc-shaped detection components 8 on the first beam 3 and the second beam 4 are vertically staggered to avoid interference.

[0032] Specifically, the arc detection component 8 includes a torsion reset device, a semi-circular support frame 9, a slide 10, a first drive component 11, and a first crack detector 12. The middle part of the semi-circular support frame 9 is connected to the horizontal beam 6 through the torsion reset device, so the semi-circular support frame 9 can rotate around its rotation support point. The first crack detector 12 is mounted on the slide 10, and the slide 10 can slide along the circumference of the semi-circular support frame 9 through the first drive component 11, so that it can detect various positions on the arc line.

[0033] The following describes the obstacle avoidance process of the device of the present invention from a distance perspective. The curvature of the semi-circular support frame 9 is set to correspond to the diameter of the bridge pier, and the middle part of the semi-circular support frame 9 is connected to the horizontal beam 6 through a torsion reset device. Figure 7 State 1 represents the state before the pier contacts the support ring 42. Before contact, the semi-circular support frame 9 remains open under the torsional prestress of the torsion reset device, meaning the front end of the semi-circular support frame 9 is radially outward at its maximum angle to avoid interference between its outer circumference and the pier when the semi-circular support frame 9 moves longitudinally. After the inner wall of the rear end of the semi-circular support frame 9 contacts the pier, the outer surface of the pier contacts the inner surface of the rear end of the support ring 42, until the movement reaches State 2, at which point the support ring 42 and the center of the pier are essentially aligned. Subsequently, the pier drives the support ring 42 and the connected semi-circular support frame 9 to rotate, and with the movement of the horizontal beam 6, the support ring 42 completely separates from the pier, reaching State 3. Finally, the support ring 42 and the semi-circular support frame 9 return to their original positions under the action of the torsion reset device, thus achieving avoidance of the pier.

[0034] In this embodiment, a second guide rail 13 is slidably disposed on the inner side of the semi-circular support frame 9. The curvature of the second guide rail 13 is the same as that of the semi-circular support frame 9, so the second guide rail 13 can slide along the circumference of the semi-circular support frame 9. A second drive assembly 14 for controlling the sliding of the second guide rail 13 along the semi-circular support frame 9 is disposed on the semi-circular support frame 9. A first guide rail 16 is fixedly connected to the upper surface of the second guide rail 13 by a vertical support column 15. The first guide rail 16 can move together with the second guide rail 13. The first guide rail 16 is slidably engaged with the slide block 10, and the first drive assembly 11 is mounted on the slide block 10. By setting the second guide rail 13, the second drive assembly 14 can simultaneously drive the second guide rail 13 to move, allowing the slide block 10 on the upper side of the second guide rail 13 to rotate further, thereby increasing the arc length of the detection, enabling the detection of some blind spots at the bottom of bridges, and better adapting to the needs of the site.

[0035] In this embodiment, the outer surface of the first guide rail 16 is provided with a first outer gear tooth 17. The first drive assembly 11 includes a first roller bracket 18 fixed to the bottom of the slide 10 and a first roller 19 rotatably connected to the first roller bracket 18. An arc-shaped groove 20 that mates with the first roller 19 is opened on the upper side of the first guide rail 16. A first motor 21 is fixed on the slide 10. The output end of the first motor 21 is connected to a first gear 22, which meshes with the first outer gear tooth 17. Driven by the first motor 21, the slide 10 can slide along the first guide rail 16, which is convenient for control. The first crack detector 12 on the slide 10 can also move with the slide 10. Similarly, the outer surface of the second guide rail 13 is provided with a second outer gear tooth 23. The second drive assembly 14 includes a second motor 24 fixedly connected to the semi-circular support frame 9. The output end of the second motor 24 is connected to a second gear 25, which meshes with the second outer gear tooth 23.

[0036] In this embodiment, the torsion reset device includes a stepped shaft 26 and a reset coil spring 27. A stepped hole, matching the stepped shaft 26, is provided at the center of the semi-circular support frame 9. The lower end of the stepped shaft 26 is fixedly connected to the horizontal beam 6, and the upper end of the stepped shaft 26 provides rotatable support for the semi-circular support frame 9. A bearing can be installed between the two. The semi-circular support frame 9 rotatably engages with the horizontal beam 6 via the stepped shaft 26. A reset coil spring 27 is sleeved on the outer side of the stepped shaft 26. The two connecting ends of the reset coil spring 27 are connected to the horizontal beam 6 and the semi-circular support frame 9, respectively. The reset coil spring 27 provides an elastic reset force, resetting the position of the semi-circular support frame 9 after it has passed the bridge pier.

[0037] In this embodiment, a groove 28 is provided on the horizontal beam 6 along its length direction. The groove 28 is a through groove that connects the upper and lower parts. The linear detection component 7 includes a third motor 29, a third gear 30, a rack 31, a connecting block 32, and a second crack detector 33. The third motor 29 is fixed on the horizontal beam 6. The output end of the third motor 29 is connected to the third gear 30. The third gear 30 meshes with the rack 31. The rack 31 slides in the groove 28. The back side of the rack 31 is connected to the second crack detector 33 through the connecting block 32. After the third motor 29 is started, it controls the rack 31 to move back and forth along the length direction of the horizontal beam 6 through the third rack 31, so as to drive the second crack detector 33 to detect the lateral position.

[0038] In this embodiment, the rolling support structure 2 includes a second roller bracket 34 and a second roller 35. The second roller bracket 34 is fixed to the lower side of the crossbeam 1. The second roller bracket 34 and the second roller 35 are rotatably connected. The second roller 35 abuts against the upper surface of the bridge. The stability of the entire device can be ensured by the support of the rolling support structure 2. Of course, in order to improve the stability of the device, the width of the crossbeam 1 and the number of second rollers 35 can be adjusted as needed.

[0039] In this embodiment, a threaded hole 36 is provided on the vertical beam 5, and a screw 37 is connected inside the threaded hole 36. One end of the screw 37 is connected to the vertical beam 5 through a nut 38, and the other end of the screw 37 is fixedly connected to a third roller bracket 39. The third roller bracket 39 is rotatably connected to a third roller 40, and the third roller 40 abuts against the side of the bridge. By providing third roller brackets 39 and third rollers 40 on both sides of the bridge, the device can be limited on both sides, preventing the device from deflecting and improving the stability of the device during testing.

[0040] In this embodiment, a support ring 42 is connected to the inner side of the semi-circular support frame 9 by a spring 41. The support ring 42 is semi-circular, and the springs 41 are evenly distributed in the interval between the semi-circular support frame and the support ring 42. By setting the support ring 42, it can replace the semi-circular support frame 9 in contact with the bridge pier, thereby increasing the service life of the device. By setting the springs 41, the device can be buffered to avoid loosening caused by long-term hard contact and collision.

[0041] 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 device for detecting cracks on the bottom surface of concrete bridges, characterized in that: The system includes a crossbeam, a rolling support structure for supporting the crossbeam, and a first and a second support beam respectively disposed at both ends of the crossbeam. Each of the first and second support beams includes a vertical beam and an L-shaped horizontal beam connected to the vertical beam. The upper end of the vertical beam is fixedly connected to the lower side of the crossbeam. One end of the horizontal beam is fixedly connected to the vertical beam, and the other end extends towards the side where the center section of the crossbeam is located. A straight line detection component is installed on the horizontal beam of both the first and second support beams, and an arc-shaped detection component is installed at the inner end of the horizontal beam. The arc-shaped detection component includes a torsion reset device, a semi-circular support frame, a slide block, a first drive assembly, and a first crack detector. The middle part of the semi-circular support frame is connected to the horizontal beam via the torsion reset device. The first crack detector is mounted on the slide block, which is driven by the first drive assembly to slide circumferentially along the semi-circular support frame. The arc-shaped detection components on the first and second support beams are vertically staggered. A second guide rail is slidably arranged on the inner side of the support frame. A second drive assembly for controlling the sliding of the second guide rail along the semi-circular support frame is provided on the semi-circular support frame. A first guide rail is fixedly connected to the upper surface of the second guide rail by a vertical support column. The first guide rail is slidably engaged with a slide block. The first drive assembly is mounted on the slide block. A first outer gear tooth is provided on the outer side of the first guide rail. The first drive assembly includes a first roller bracket fixed to the bottom of the slide block and a first roller rotatably connected to the first roller bracket. An arc-shaped groove that engages with the first roller is opened on the upper side of the first guide rail. A first motor is fixed on the slide block. A first gear is connected to the output end of the first motor. The first gear meshes with the first outer gear tooth. A second outer gear tooth is provided on the outer side of the second guide rail. The second drive assembly includes a second motor fixedly connected to the semi-circular support frame. A second gear is connected to the output end of the second motor. The second gear meshes with the second outer gear tooth.

2. The device for detecting cracks on the bottom surface of a concrete bridge according to claim 1, characterized in that: The torsion reset device includes a stepped shaft and a reset coil spring. The center of the semi-circular support frame has a stepped hole that mates with the stepped shaft. The semi-circular support frame is rotatably connected to the horizontal beam through the stepped shaft. A reset coil spring is sleeved on the outer side of the stepped shaft. The two connecting ends of the reset coil spring are respectively connected to the horizontal beam and the semi-circular support frame.

3. The device for detecting cracks on the bottom surface of a concrete bridge according to claim 1, characterized in that: A groove is provided on the horizontal beam along its length. The linear detection assembly includes a third motor, a third gear, a rack, a connecting block, and a second crack detector. The third motor is fixed on the horizontal beam. The output end of the third motor is connected to the third gear. The third gear meshes with the rack. The rack slides in the groove. The back side of the rack is connected to the second crack detector through the connecting block.

4. The device for detecting cracks on the bottom surface of a concrete bridge according to claim 1, characterized in that: The rolling support structure includes a second roller bracket and a second roller. The second roller bracket is fixed to the lower side of the crossbeam. The second roller bracket is rotatably connected to the second roller. The second roller abuts against the upper surface of the bridge.

5. The device for detecting cracks on the bottom surface of a concrete bridge according to claim 1, characterized in that: The vertical beam has a threaded hole, and a screw is connected to the threaded hole. One end of the screw is connected to the vertical beam through a nut, and the other end of the screw is fixedly connected to a third roller bracket. The third roller bracket is rotatably connected to the third roller, and the third roller abuts against the side of the bridge.

6. A device for detecting cracks on the bottom surface of a concrete bridge according to any one of claims 1-5, characterized in that: The inner side of the semi-circular support frame is connected to a support ring by a spring, and the spring is evenly distributed in the interval between the semi-circular support frame and the support ring.

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