A bridge deck crack detection device for steel-concrete variable cross-section continuous box girder bridge

Abstract

The present invention discloses a bridge deck crack detection device for a steel-concrete variable cross-section continuous box girder bridge, and relates to the field of bridge deck crack detection equipment. In the present invention, a coupling agent is applied to a transducer by a coupling agent coating unit, and the distance between the transducer and the bridge deck crack is adjusted by an angle adjustment component and a bidirectional translation drive unit, and finally the transducer is driven downward to abut against the bridge deck by a lifting drive unit to detect the bridge deck crack. Compared with manual detection, the present application detects by automatically driving the transducer through each component, which can improve the crack detection efficiency, shorten the time used for overall bridge crack detection, and reduce the impact of crack detection on bridge traffic; and the detection component and the coupling agent component are installed on a mobile trolley, so that when detecting bridge cracks, the mobile trolley and the detection mechanism can be driven by a bridge engineering vehicle to move on the bridge deck, thereby improving the safety of the detection personnel during crack detection.

Description

Technical Field

[0001] The present invention belongs to the field of bridge deck crack detection equipment, and in particular, relates to a bridge deck crack detection device for a steel-concrete variable cross-section continuous box girder bridge. Background Art

[0002] With the development of large-span bridges, the development trend of bridge structure design is to rationally utilize the organizational properties of various materials, improve the comprehensive ability to resist natural disasters, and ensure the lowest cost during the service life. The hybrid beam structure is a specific embodiment of material optimization. The large-span steel-concrete hybrid variable-section continuous box girder in the span range of 180-350 meters can effectively solve the problems of new bridges crossing the river with one span, limited side spans, and limited clearance. The large-span variable-section continuous box girder bridge uses a section of steel box girder in the middle of the span, which can effectively reduce the beam height in the middle of the span, shorten the length of the side span and approach bridge, reduce the cantilever casting construction links, engineering volume and high-altitude operation risks, effectively shorten the construction period, and significantly reduce the project cost.

[0003] The core stress position of the large-span steel-concrete continuous box girder bridge with variable cross-section is the steel-concrete joint section. During the construction process, the steel structure at the steel-concrete joint section limits the shrinkage of concrete, which is easy to cause cracks at this position; during the operation period, this position is subject to alternating bending moments, which is also easy to cause cracks. The cracks at this position will directly cause water vapor to enter the joint surface, affecting the durability of the structure. If the cracks at this position cannot be discovered and repaired in time, it will affect the safety of the bridge. However, the top surface of the steel-concrete joint section is generally covered with asphalt pavement. If cracks occur at this position, they will be reflected to the asphalt pavement layer, causing the pavement layer to crack. However, when the bridge is open to traffic, checking the cracks on the asphalt pavement layer on the top surface of the steel-concrete joint section not only affects the traffic efficiency, but also threatens the safety of maintenance personnel; moreover, when the cracks are observed by the naked eye, the crack width is already too large, and manual inspection cannot timely detect the cracking disease at the steel-concrete joint section and block it in time. Therefore, a crack detection device that can be fast and efficient without affecting traffic is needed to ensure the high-level operation of the steel-concrete continuous box girder bridge with variable cross-section.

[0004] Chinese patent application CN111665262A discloses a mobile bridge crack detection device, including a detection mechanism and a fixing mechanism, wherein the detection mechanism includes a detection mechanism housing, a detector and a camera; the detector and the camera are fixedly mounted on the detection mechanism housing. The mobile detection mechanism can drive the detector and the camera to move on the bridge surface to detect cracks on the bridge surface, and the detector and the camera cooperate to detect whether cracks are generated on the bridge surface, but the crack depth cannot be accurately detected, so the hazard level of the detected cracks to the bridge cannot be determined, and further, it cannot help the staff to formulate corresponding maintenance strategies according to the hazard level of the bridge.

[0005] Chinese patent CN207317677U discloses a crack depth detector, including a host and a transducer, the host and the transducer are connected by a connecting line, the transducer is provided with a measuring ruler, the measuring ruler is provided with a storage cavity for storing coupling agent, the storage cavity is provided with a push block, the storage cavity is provided with an outlet for coupling agent to be extruded, one side of the measuring ruler is provided with a driving mechanism for extruding coupling agent, the driving mechanism includes a push rod slidably connected to the measuring ruler, the push rod extends out of the measuring ruler, a transmission mechanism for linking the push rod and the push block is provided between the push rod and the push block, and a spring for resetting is provided on the measuring ruler, one end of the spring is fixed to the push rod, and the other end is fixed to the measuring ruler. Among them, by detecting the coordination of the host, the transducer, the measuring ruler and the coupling agent, the crack depth can be accurately measured, so that it is convenient for the staff to formulate corresponding maintenance strategies according to the crack depth. However, when using the detector, the surveyor needs to apply coupling agent on the transducer, and then adjust the distance between the two transducers and the crack by means of a measuring ruler, and finally the transducer detects the depth of the crack. The operation is cumbersome and the detection efficiency is low. When the detector is used for bridge detection, it takes a long time and will affect the normal traffic of the bridge. Moreover, it requires manual operation for crack detection, and there are many vehicles passing on the bridge. Even if corresponding roadblocks are set up for isolation during detection, there are still certain safety hazards for the inspectors. Summary of the invention

[0006] In response to the problems in the related technology, the present invention proposes a bridge deck crack detection device for a steel-concrete variable-section continuous box girder bridge to overcome the problems in the existing related technology that the detector is cumbersome to operate and has low detection efficiency. When the detector is used for bridge detection, it takes a long time and affects the normal traffic of the bridge. It also requires manual operation for crack detection. However, there are many vehicles passing through the bridge. Even if corresponding roadblocks are set up during detection, there are still certain safety hazards and technical problems for the inspectors.

[0007] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0008] The present invention is a bridge deck crack detection device for a steel-concrete variable cross-section continuous box girder bridge, comprising a moving trolley, an angle adjustment component, a detection component and a coupling agent component, wherein a connecting frame is fixedly installed on one side of the top of the moving trolley, the angle adjustment component comprises a rotary drive unit and an adjustment plate, and the adjustment plate is rotatably mounted on the moving trolley through the rotary drive unit;

[0009] The detection assembly includes a bidirectional translation drive unit, a lifting drive unit, a detector host, a camera, two mobile seats and two transducers. The detector host is fixedly installed on the top surface of the adjustment plate, the camera is fixedly installed on the bottom surface of the adjustment plate, the two mobile seats are symmetrically installed at both ends of the camera through the bidirectional translation drive unit, the two transducers are respectively lifted and installed at the bottom of the two mobile seats through the lifting drive unit, and the camera and the transducer are connected to the detector host signal through a connecting line;

[0010] The bidirectional translation driving unit drives the two moving seats to translate equidistantly at both ends of the camera, so that the two moving seats drive the two transducers to translate equidistantly at both ends of the camera, and the lifting driving unit drives the transducers to move up and down, so that the bottom ends of the transducers abut against the bridge deck;

[0011] The coupling agent assembly includes a bracket plate, a coupling agent smearing unit, a transmission unit, a rotating unit and a cleaning brush. The bracket plate is fixedly mounted on the bottom surface of the adjustment plate. The coupling agent smearing unit is fixedly mounted on one side of the bracket plate. The cleaning brush located between the coupling agent smearing unit and the movable seat is rotatably mounted on the other side of the bracket plate through the rotating unit. The rotating unit is transmission-connected to the movable seat through the transmission unit.

[0012] When the movable seat moves past the bracket plate position, the bottom end of the transducer moves past the top surface of the cleaning brush, and at the same time the movable seat drives the rotating unit and the cleaning brush to rotate through the transmission unit, so that the cleaning brush rotates and cleans the bottom surface of the transducer when the transducer passes by.

[0013] Furthermore, the rotation drive unit includes a through slot, a bracket and an adjusting motor, the through slot is opened on the bottom plate of the mobile vehicle, the bracket is fixedly installed in the through slot, the adjusting motor is fixedly installed at the bottom end of the bracket, and the output end of the adjusting motor is transmission-connected to the adjusting plate.

[0014] Further, the bidirectional translation drive unit includes a rotary motor and a double-threaded screw, the double-threaded screw is rotatably mounted on the bottom surface of the adjustment plate, two sets of external threads in opposite directions are arranged at both ends of the double-threaded screw, the two moving seats are respectively threadedly mounted on the two ends of the double-threaded screw through the two sets of external threads, and the top surfaces of the two moving seats are slidably connected to the bottom surface of the adjustment plate;

[0015] The rotary motor is fixedly mounted on the bottom surface of the adjustment plate, and the output end of the rotary motor is transmission-connected to one end of the double-threaded lead screw.

[0016] Furthermore, the lifting drive unit includes a hydraulic cylinder, a limit column and a lifting plate. The hydraulic cylinder is fixedly installed on the bottom surface of the moving seat, and the limit columns are fixedly installed on both sides of the hydraulic cylinder. The lifting plate is fixedly installed on the telescopic rod at the bottom of the hydraulic cylinder, and both sides of the lifting plate are slidably plugged into the limit columns.

[0017] Further, a rotating seat is fixedly installed at the bottom end of the limiting column, a connecting shaft is rotatably installed at the bottom end of the rotating seat, a protective baffle is fixedly installed at the lower end of the connecting shaft, and one end of the protective baffle abuts against the bottom surface of the transducer for protection;

[0018] A baffle driving gear is fixedly installed on the bottom end of the connecting shaft, and a baffle driving rack tangent to the baffle driving gear is fixedly installed on one side of the bracket plate.

[0019] Furthermore, the coupling agent application unit includes an application head, a catheter and a coupling agent storage bottle, the coupling agent storage bottle is fixedly installed on the back of the bracket plate, the application head outlet is fixedly installed upward on the bottom of the bracket plate, the coupling agent storage bottle and the application head are connected through the catheter, and a hydraulic pump is installed on the catheter.

[0020] Furthermore, the transmission unit includes a transmission shaft, a driven gear and a translation rack, the transmission shaft is rotatably mounted on the back of the bracket plate, the driven gear is fixedly mounted on the top of the transmission shaft, and the translation rack is fixedly mounted on the back of the moving seat and is tangent to the driven gear.

[0021] Furthermore, the rotating unit includes a driving wheel, a rotating shaft and a driven wheel, the rotating shaft is rotatably installed on the bottom of the bracket plate, the cleaning brush is fixedly installed on the bottom end of the rotating shaft, the driven wheel is fixedly installed on the bottom end of the rotating shaft, the driving wheel is fixedly installed on the bottom end of the transmission shaft, and the driving wheel and the driven wheel are connected by a transmission belt.

[0022] Furthermore, a plurality of dispersedly arranged coupling agent outlets are provided on the top surface of the coating head.

[0023] The present invention has the following beneficial effects:

[0024] 1. In the present invention, a coupling agent is applied to the transducer by a coupling agent coating unit, and the distance between the transducer and the bridge deck crack is adjusted by an angle adjustment component and a bidirectional translation drive unit. Finally, the transducer is driven downward by a lifting drive unit to abut against the bridge deck to detect the bridge deck crack. Compared with manual detection, the present application performs detection by automatically driving the transducer through various components, which can improve the efficiency of crack detection, shorten the time used for overall bridge crack detection, and reduce the impact of crack detection on bridge traffic.

[0025] 2. In the present invention, the detection assembly and the coupling agent assembly are installed on a mobile trolley, and the mobile trolley is connected to the bridge engineering vehicle through a connecting frame, so that when detecting bridge cracks, the mobile trolley and the detection assembly and the coupling agent assembly can be driven by the bridge engineering vehicle to move on the bridge deck, without the need for manual movement of the detection assembly and the coupling agent assembly on the bridge, thereby improving the safety of detection personnel during crack detection. At the same time, the overall moving speed of the detection device can be increased by driving the engineering vehicle, thereby further improving the detection efficiency and shortening the time required for bridge crack detection.

[0026] 3. In the present invention, when the movable seat moves past the bracket plate position, the bottom end of the transducer moves past the top surface of the cleaning brush, and at the same time the movable seat drives the rotating unit and the cleaning brush to rotate through the transmission unit, so that the cleaning brush rotates and cleans the bottom surface of the transducer when the transducer passes by, thereby removing dust and residual coupling agent adhered to the bottom surface of the transducer, thereby keeping the bottom surface of the transducer clean, ensuring that the transducer can fit with the bridge deck under the action of the coupling agent when in use, thereby ensuring the detection accuracy of the transducer and making the detection of bridge deck crack depth more accurate.

[0027] 4. In the present invention, a protective baffle is rotatably installed on the bottom surface of the transducer, and the bottom surface of the transducer can be shielded and protected by the protective baffle to prevent the transducer from being damaged by collision with debris splashed from the bridge deck during the movement of the mobile trolley, and at the same time prevent dust and the like from adhering to the bottom surface of the transducer, so that the bottom surface of the transducer remains clean; and when the transducer moves past the position of the bracket plate, the baffle driving gear and the baffle driving rack cooperate to drive the baffle to rotate and move away, so that the baffle no longer blocks the bottom of the transducer, thereby allowing the transducer to be used normally, and the baffle rotates past the bristle position of the cleaning brush, and can scrape and clean the bristles of the cleaning brush, thereby removing debris remaining on the bristles, so as to improve the cleaning effect of the cleaning brush on the transducer.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the detection device of the present invention;

[0031] Figure 2 It is a schematic diagram of a three-dimensional cross-section structure of the detection device of the present invention;

[0032] Figure 3 For the present invention Figure 2 A local enlarged structural schematic diagram;

[0033] Figure 4 This is one of the three-dimensional structural schematic diagrams of the adjustment seat of the present invention;

[0034] Figure 5 For the present invention Figure 4 A schematic diagram of the local enlarged structure at B;

[0035] Figure 6 The second schematic diagram of the three-dimensional structure of the adjustment seat of the present invention;

[0036] Figure 7 For the present invention Figure 6 A schematic diagram of the local enlarged structure at C;

[0037] Figure 8 The present invention is a schematic diagram of the detection device of the present invention when performing crack detection on the bridge deck of a steel-concrete variable cross-section continuous box girder bridge.

[0038] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0039] 1. Mobile trolley; 2. Connecting frame; 3. Angle adjustment assembly; 31. Through slot; 32. Bracket; 33. Adjustment motor; 34. Adjustment plate; 4. Detection assembly; 41. Detector host; 42. Moving seat; 43. Camera; 44. Transducer; 45. Rotating motor; 46. Double-threaded screw; 47. Hydraulic cylinder; 48. Limiting column; 49. Lifting plate; 410. Rotating seat; 411. Connecting shaft; 412. Protective baffle; 413. Baffle driving gear; 414. Baffle driving rack; 5. Coupling agent assembly; 51. Bracket plate; 52. Applicator head; 53. Catheter; 54. Cleaning brush; 55. Transmission shaft; 56. Driven gear; 57. Translation rack; 58. Coupling agent storage bottle; 59. Hydraulic pump; 510. Driving wheel; 511. Transmission belt; 512. Rotating shaft; 513. Driven wheel;

[0040] 100. Steel-concrete variable-section continuous box girder bridge; 101. Variable-section concrete beam section; 102. Steel box girder section; 200. Bridge engineering vehicle. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0042] In the description of the present invention, it is necessary to understand that the terms "opening", "upper", "lower", "top", "middle", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention.

[0043] See also Figure 1 , Figure 4 , Figure 5 , Figure 8 As shown, the present invention is a bridge deck crack detection device for a steel-concrete variable cross-section continuous box girder bridge, comprising a moving trolley 1, an angle adjustment component 3, a detection component 4 and a coupling agent component 5. A connecting frame 2 is fixedly installed on one side of the top of the moving trolley 1. The angle adjustment component 3 comprises a rotation drive unit and an adjustment plate 34. The adjustment plate 34 is rotatably installed on the moving trolley 1 through the rotation drive unit; the detection component 4 comprises a bidirectional translation drive unit, a lifting drive unit, a detector host 41, a camera 43, two moving seats 42 and two transducers 44. The detector host 41 is fixedly installed on the top surface of the adjustment plate 34, the camera 43 is fixedly installed on the bottom surface of the adjustment plate 34, the two moving seats 42 are symmetrically installed at both ends of the camera 43 through the bidirectional translation drive unit, and the two transducers 44 are respectively lifted and installed at the bottom of the two moving seats 42 through the lifting drive unit, and the camera 43 and the transducer 44 are both connected to the detector host 41 signal through a connecting line; the bidirectional translation drive unit drives The two moving seats 42 are moved equidistantly at both ends of the camera 43, so that the two moving seats 42 drive the two transducers 44 to move equidistantly at both ends of the camera 43, and the lifting drive unit drives the transducer 44 to move up and down, so that the bottom end of the transducer 44 abuts against the bridge deck; the coupling agent assembly 5 includes a bracket plate 51, a coupling agent coating unit, a transmission unit, a rotating unit and a cleaning brush 54, the bracket plate 51 is fixedly installed on the bottom surface of the adjustment plate 34, the coupling agent coating unit is fixedly installed on one side of the bracket plate 51, and the cleaning brush 54 located between the coupling agent coating unit and the moving seat 42 is rotatably installed on the other side of the bracket plate 51 through the rotating unit, and the rotating unit is connected to the moving seat 42 through the transmission unit; when the moving seat 42 moves past the position of the bracket plate 51, the bottom end of the transducer 44 moves past the top surface of the cleaning brush 54, and at the same time, the moving seat 42 drives the rotating unit and the cleaning brush 54 to rotate through the transmission unit, so that the cleaning brush 54 rotates and cleans the bottom surface of the transducer 44 when the transducer 44 passes;

[0044] The steel-concrete variable cross-section continuous box girder bridge 100 includes variable cross-section concrete beam sections 101 on both sides of the bridge body and steel box girder sections 102 installed between the variable cross-section concrete beam sections 101 at both ends; when detecting cracks on the bridge deck, one end of the connecting frame 2 is fixedly connected to the bridge engineering vehicle 200, so that the bridge engineering vehicle 200 drives the mobile trolley 1 to perform mobile detection on the bridge deck of the steel-concrete variable cross-section continuous box girder bridge 100, and the angle adjustment component 3, the detection component 4 and the coupling agent component 5 on the mobile trolley 1 are connected to the central control system in the bridge engineering vehicle 200 through connecting lines, so that the staff can operate the detection device in the vehicle;

[0045] When the camera 43 detects a crack on the bridge deck, the staff first drives the mobile car 1 and the camera 43 to move by the bridge engineering vehicle 200 until the camera 43 moves to the top of the crack on the bridge deck, and then drives the adjustment plate 34 to rotate by the rotation drive unit, so that the adjustment plate 34 is perpendicular to the crack on the bridge deck, so that the two transducers 44 are symmetrically distributed on both sides of the crack on the bridge deck, and then drives the two moving seats 42 to move in opposite directions at the same speed by the bidirectional translation drive unit, thereby driving the two transducers 44 to move in opposite directions at the same speed to adjust the distance between the transducer 44 and the crack on the bridge deck. When the moving seat 42 moves past the position of the bracket plate 51, the bottom end of the transducer 44 moves past the top surface of the cleaning brush 54, and at the same time, the moving seat 42 drives the rotating unit and the cleaning brush 54 to rotate through the transmission unit, so that the cleaning brush 54 rotates and cleans the bottom surface of the transducer 44 when the transducer 44 passes through the transducer 44, so that the top surface of the transducer 44 remains clean. After that, the transducer 44 continues to move through the position of the coupling agent coating unit, and the coupling agent coating unit coats the coupling agent on the bottom surface of the transducer 44; when the transducer 44 moves a certain distance to reach the corresponding detection position, the lifting drive unit drives the transducer 44 downward, so that the bottom surface of the transducer 44 is coupled with the coupling agent and is tightly attached to the bridge deck, and the two transducers 44 cooperate to perform ultrasonic detection on the bridge to detect the depth of the cracks. After the detection, the lifting drive unit drives the transducer 44 upward to reset, so that the bottom surface of the transducer 44 is separated from the bridge deck, and then the two transducers 44 are driven to continue to move in the opposite direction by the bidirectional translation drive unit, and the distance between the transducer 44 and the bridge deck crack is increased, and then the lifting drive unit drives the transducer 44 downward to detect the bridge deck cracks, and in this way, the two transducers 44 cooperate to detect the bridge deck cracks 3-4 times to improve the detection accuracy of the cracks;

[0046] When the detection is completed, the transducer 44 is driven upward by the lifting drive unit to reset and separate from the bridge deck, and then the two moving seats 42 are driven to move toward each other for reset by the bidirectional translation drive unit, thereby driving the two transducers 44 to move toward each other for reset. When the moving seat 42 resets and moves past the position of the bracket plate 51, the bottom end of the transducer 44 moves past the top surface of the cleaning brush 54, and at the same time, the moving seat 42 drives the rotating unit and the cleaning brush 54 to rotate again through the transmission unit, so that the cleaning brush 54 rotates and cleans the bottom surface of the transducer 44, removes the coupling agent remaining on the bottom surface of the transducer 44, prevents the coupling agent from drying and adhering to the bottom surface of the transducer 44, and ensures the subsequent normal use of the transducer 44.

[0047] In the present invention, a coupling agent is applied to the transducer 44 by a coupling agent coating unit, and the angle and the distance between the transducer 44 and the cracks on the bridge deck are adjusted by an angle adjustment component 3 and a bidirectional translation drive unit. Finally, the transducer 44 is driven downward by the lifting drive unit to abut against the bridge deck to detect the cracks on the bridge deck. Compared with manual detection, this embodiment performs detection by automatically driving the transducer 44 through the cooperation of various components, which can improve the efficiency of crack detection, shorten the time used for overall crack detection on the bridge, and reduce the impact of crack detection on bridge traffic. At the same time, the detection component 4 and the coupling agent component 5 are installed on the mobile trolley 1, and the mobile trolley 1 is connected to the bridge engineering vehicle 200 through the connecting frame 2, so that when detecting cracks on the bridge, the mobile trolley 1 and the detection component 5 can be driven by the bridge engineering vehicle 200. The component 4 and the coupling agent component 5 move on the bridge deck without the need for manual movement of the detection component 4 and the coupling agent component 5 on the bridge, thereby improving the safety of detection personnel during crack detection. At the same time, the driving of the bridge engineering vehicle 200 can increase the overall moving speed of the detection device, thereby further improving the detection efficiency and shortening the time required for bridge crack detection; and when the transducer 44 moves, the transmission unit drives the rotating unit and the cleaning brush 54 to rotate, so that the cleaning brush 54 rotates and cleans the bottom surface of the transducer 44 when the transducer 44 passes by, removes dust and residual coupling agent adhered to the bottom surface of the transducer 44, so that the bottom surface of the transducer 44 is kept clean, ensuring that the transducer 44 can fit with the bridge deck under the action of the coupling agent when in use, thereby ensuring the detection accuracy of the transducer, and making the depth detection of bridge deck cracks more accurate.

[0048] See also Figure 2 , Figure 3 As shown, in one embodiment, the rotation drive unit includes a through slot 31, a bracket 32 ​​and an adjusting motor 33. The through slot 31 is opened on the bottom plate of the mobile vehicle 1, the bracket 32 ​​is fixedly installed in the through slot 31, the adjusting motor 33 is fixedly installed at the bottom end of the bracket 32, and the output end of the adjusting motor 33 is transmission-connected with the adjusting plate 34; when the rotation drive unit is working, the adjusting motor 33 is turned on to drive the adjusting plate 34 to rotate, so as to rotate the adjusting plate 34 to an angle perpendicular to the crack in the bridge deck.

[0049] See also Figure 4-Figure 6 As shown, in one embodiment, the bidirectional translation driving unit includes a rotating motor 45 and a double-threaded screw 46, the double-threaded screw 46 is rotatably mounted on the bottom surface of the adjustment plate 34, two ends of the double-threaded screw 46 are provided with two sets of external threads in opposite directions, two moving seats 42 are respectively threadedly mounted on the two ends of the double-threaded screw 46 through the two sets of external threads, and the top surfaces of the two moving seats 42 are both slidably connected to the bottom surface of the adjustment plate 34; the rotating motor 45 is fixedly mounted on the bottom surface of the adjustment plate 34, and the output end of the rotating motor 45 is transmission-connected to one end of the double-threaded screw 46;

[0050] Among them, the pitch of the external threads at both ends of the double-threaded screw 46 is the same. When the bidirectional translation drive unit is working, the rotating motor 45 drives the double-threaded screw 46 to rotate, and the double-threaded screw 46 drives the two moving seats 42 to move in opposite directions at the same speed through the external threads at both ends during the rotation process, thereby driving the two transducers 44 to move in opposite directions at the same speed, so as to adjust and increase the distance between the two transducers 44 and the bridge deck cracks, so that the transducers 44 can detect the bridge deck cracks at different positions away from the bridge deck cracks; and when the bridge deck cracks are detected, the double-threaded screw 46 is driven to rotate in the opposite direction by the rotating motor 45, so that the moving seats 42 at both ends are driven to move toward each other and gradually reset through the double-threaded screw 46, and the two transducers 44 are driven to gradually move and reset through the two moving seats 42.

[0051] See also Figure 4 , Figure 5 As shown, in one embodiment, the lifting drive unit includes a hydraulic cylinder 47, a limit column 48 and a lifting plate 49. The hydraulic cylinder 47 is fixedly installed on the bottom surface of the moving seat 42, and the limit columns 48 are fixedly installed on both sides of the hydraulic cylinder 47. The lifting plate 49 is fixedly installed on the telescopic rod at the bottom of the hydraulic cylinder 47, and both sides of the lifting plate 49 are slidably plugged into the limit columns 48; when the lifting drive unit is working, the hydraulic cylinder 47 extends to drive the lifting plate 49 downward, thereby driving the moving seat 42 and the transducer 44 downward until the transducer 44 abuts against the bridge deck for crack detection. When the detection is completed, the hydraulic cylinder 47 resets and contracts to drive the lifting plate 49, the moving seat 42 and the transducer 44 to reset upward, and the limit columns 48 guide and limit the lifting plate 49 when the lifting plate 49 moves up and down, so that the lifting and moving process of the lifting plate 49 is smoother.

[0052] See also Figure 5As shown, in one embodiment, a rotating seat 410 is fixedly installed at the bottom end of the limiting column 48, a connecting shaft 411 is rotatably installed at the bottom end of the rotating seat 410, a protective baffle 412 is fixedly installed at the lower end of the connecting shaft 411, and one end of the protective baffle 412 abuts against the bottom surface of the transducer 44 for protection; a baffle driving gear 413 is fixedly installed at the bottom end of the connecting shaft 411, and a baffle driving rack 414 tangential to the baffle driving gear 413 is fixedly installed on one side of the bracket plate 51;

[0053] Among them, the protective baffle 412 shields and protects the bottom surface of the transducer 44 to prevent the transducer 44 from being damaged by collision with debris splashed from the bridge deck during movement, and at the same time prevents dust and the like from adhering to the bottom surface of the transducer 44, so that the bottom surface of the transducer remains clean; and when the transducer 44 moves past the position of the bracket plate 51, the baffle driving rack 414 and the baffle driving gear 413 engage with each other, and the baffle driving gear 413 starts to rotate under the drive of the baffle driving rack 414, and drives one end of the protective baffle 412 to rotate away from the bottom surface of the transducer 44, so that the protective baffle 412 no longer blocks the bottom of the transducer 44, thereby enabling the transducer 44 to be used normally subsequently, and the protective baffle 412 rotates past the bristle position of the cleaning brush 54, and can scrape and clean the bristles of the cleaning brush 54, thereby removing the debris remaining on the bristles, so as to improve the subsequent cleaning effect of the cleaning brush 54 on the transducer 44.

[0054] See also Figure 5-Figure 7 As shown, in one embodiment, the coupling agent coating unit includes an coating head 52, a conduit 53 and a coupling agent storage bottle 58. The coupling agent storage bottle 58 is fixedly mounted on the back of the bracket plate 51. The outlet of the coating head 52 is fixedly mounted on the bottom of the bracket plate 51 with the outlet facing upward. The coupling agent storage bottle 58 is connected to the coating head 52 through the conduit 53, and a hydraulic pump 59 is installed on the conduit 53. When the transducer 44 moves over the coating head 52, the hydraulic pump 59 is turned on, and the coupling agent in the coupling agent storage bottle 58 is pumped out from the outlet on the top surface of the coating head 52 by the hydraulic pressure of the hydraulic pump 59, so as to coat the coupling agent to the bottom surface of the transducer 44.

[0055] See also Figure 5 As shown, in one embodiment, a plurality of dispersedly arranged coupling agent outlets are provided on the top surface of the coating head 52. By providing a plurality of coupling agent outlets, the coupling agent can be dispersedly coated on the bottom surface of the transducer 44 when pumped out, so that the coupling agent is more evenly distributed on the bottom surface of the transducer 44, so that the transducer 44 fits more closely with the bridge deck when in use.

[0056] See also Figure 5-Figure 7As shown, in one embodiment, the transmission unit includes a transmission shaft 55, a driven gear 56 and a translation rack 57. The transmission shaft 55 is rotatably mounted on the back of the bracket plate 51, the driven gear 56 is fixedly mounted on the top of the transmission shaft 55, and the translation rack 57 is fixedly mounted on the back of the moving seat 42 and is tangent to the driven gear 56; the rotation unit includes a driving wheel 510, a rotating shaft 512 and a driven wheel 513. The rotating shaft 512 is rotatably mounted on the bottom of the bracket plate 51, a cleaning brush 54 is fixedly mounted on the bottom end of the rotating shaft 512, and a driven wheel 513 is fixedly mounted on the bottom end of the rotating shaft 512. The driving wheel 510 is fixedly mounted on the bottom end of the transmission shaft 55, and the driving wheel 510 and the driven wheel 513 are connected through a transmission belt 511.

[0057] When the movable seat 42 moves past the position of the bracket plate 51, the movable seat 42 drives the translation rack 57 to move so that the translation rack 57 engages with the driven gear 56, and then the translation rack 57 drives the driven gear 56 to rotate during the movement, thereby driving the transmission shaft 55 and the driving wheel 510 to rotate, and the driving wheel 510 drives the driven wheel 513 to rotate through the transmission belt 511, and finally the driven wheel 513 drives the rotating shaft 512 and the cleaning brush 54 to rotate, so that the rotating cleaning brush 54 can clean the transducer 44 that is moving past.

[0058] Directions:

[0059] First, one end of the connecting frame 2 is fixedly connected to the bridge engineering vehicle 200, so that the bridge engineering vehicle 200 drives the mobile vehicle 1 to perform mobile detection on the bridge deck of the steel-concrete variable-section continuous box girder bridge 100. When the camera 43 detects a crack on the bridge deck, the staff drives the mobile vehicle 1 and the camera 43 to move by the bridge engineering vehicle 200 until the camera 43 moves to the top of the crack on the bridge deck;

[0060] Then, the adjusting motor 33 is used to drive the adjusting plate 34 to rotate, so as to adjust the adjusting plate 34 to an angle perpendicular to the crack on the bridge deck, thereby making the two transducers 44 symmetrically distributed on both sides of the crack on the bridge deck, and then the rotating motor 45 is used to drive the double-threaded screw 46 to rotate. During the rotation process, the double-threaded screw 46 drives the two moving seats 42 to move in opposite directions at the same speed through the external threads at both ends, thereby driving the two transducers 44 to move in opposite directions at the same speed, so as to adjust and increase the distance between the two transducers 44 and the crack on the bridge deck;

[0061] When the transducer 44 moves past the position of the bracket plate 51, the baffle driving rack 414 and the baffle driving gear 413 mesh, and the baffle driving gear 413 starts to rotate and move away under the drive of the baffle driving rack 414, so that the protective baffle 412 no longer blocks the bottom of the transducer 44, so that the transducer 44 can be used normally later, and the protective baffle 412 rotates past the bristle position of the cleaning brush 54, and can scrape and clean the bristles of the cleaning brush 54, thereby removing dust and other debris on the bristles;

[0062] Then, the bottom end of the transducer 44 moves past the top surface of the cleaning brush 54, and at the same time, the moving seat 42 drives the translation rack 57 to move so that the translation rack 57 is meshed with the driven gear 56. The translation rack 57 drives the driven gear 56 to rotate during the movement, thereby driving the transmission shaft 55 and the driving wheel 510 to rotate. The driving wheel 510 drives the driven wheel 513 to rotate through the transmission belt 511. Finally, the driven wheel 513 drives the rotating shaft 512 and the cleaning brush 54 to rotate, so that the rotating cleaning brush 54 cleans the transducer 44, so that the bottom surface of the transducer 44 is kept clean.

[0063] When the transducer 44 moves over the coating head 52, the hydraulic pump 59 is turned on, and the coupling agent in the coupling agent storage bottle 58 is pumped out from the outlet on the top surface of the coating head 52 by the hydraulic pressure of the hydraulic pump 59, so as to coat the coupling agent on the bottom surface of the transducer 44;

[0064] When the transducer 44 moves a certain distance to reach the corresponding detection position, the hydraulic cylinder 47 drives the transducer 44 downward, so that the bottom surface of the transducer 44 is coupled to the bridge deck by the coupling agent, and the two transducers 44 cooperate to perform ultrasonic detection on the bridge to detect the depth of the crack. After the detection, the hydraulic cylinder 47 drives the transducer 44 upward to reset, so that the bottom surface of the transducer 44 is separated from the bridge deck, and then the two transducers 44 are driven to continue to move in the opposite direction by the bidirectional translation drive unit to increase the distance between the transducer 44 and the bridge deck crack, and then the hydraulic cylinder 47 drives the transducer 44 downward to detect the bridge deck crack, and the two transducers 44 cooperate to detect the bridge deck crack 3-4 times in this way to improve the detection accuracy of the crack;

[0065] When the detection is completed, the transducer 44 is driven upward by the hydraulic cylinder 47 to reset and separate from the bridge deck, and then the two moving seats 42 are driven to move toward each other for reset by the bidirectional translation drive unit, thereby driving the two transducers 44 to move toward each other for reset. When the moving seat 42 resets and moves past the position of the bracket plate 51, the bottom end of the transducer 44 moves past the top surface of the cleaning brush 54, and at the same time, the moving seat 42 drives the rotating unit and the cleaning brush 54 to rotate again through the transmission unit, so that the cleaning brush 54 rotates and cleans the bottom surface of the transducer 44, removes the coupling agent remaining on the bottom surface of the transducer 44, prevents the coupling agent from drying and adhering to the bottom surface of the transducer 44, and ensures the subsequent normal use of the transducer 44.

[0066] Finally, the baffle driving gear 413 moves past the baffle driving rack 414, and the baffle driving gear 413 rotates in the opposite direction and resets under the meshing drive of the baffle driving rack 414, and drives the protective baffle 412 to rotate and reset, so that one end of the protective baffle 412 moves to the bottom of the transducer 44 again to shield and protect the transducer.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] The preferred embodiments of the invention disclosed above are only used to help explain the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the invention, so that those skilled in the art can understand and use the invention well.

Claims

1. A bridge deck crack detection device for a steel-concrete variable cross-section continuous box girder bridge, characterized in that: The invention comprises a moving trolley (1), an angle adjustment component (3), a detection component (4) and a coupling agent component (5); a connecting frame (2) is fixedly mounted on one side of the top of the moving trolley (1); the angle adjustment component (3) comprises a rotation drive unit and an adjustment plate (34); the adjustment plate (34) is rotationally mounted on the moving trolley (1) through the rotation drive unit; The detection assembly (4) comprises a bidirectional translation drive unit, a lifting drive unit, a detector host (41), a camera (43), two movable seats (42) and two transducers (44); the detector host (41) is fixedly mounted on the top surface of the adjustment plate (34); the camera (43) is fixedly mounted on the bottom surface of the adjustment plate (34); the two movable seats (42) are symmetrically mounted on the two ends of the camera (43) through the bidirectional translation drive unit; the two transducers (44) are respectively lifted and mounted on the bottom of the two movable seats (42) through the lifting drive unit; and the camera (43) and the transducer (44) are both connected to the detector host (41) by signals through connecting lines; The bidirectional translation drive unit drives the two moving seats (42) to translate equidistantly at both ends of the camera (43), so that the two moving seats (42) drive the two transducers (44) to translate equidistantly at both ends of the camera (43), and the lifting drive unit drives the transducers (44) to move up and down, so that the bottom ends of the transducers (44) abut against the bridge deck; The coupling agent assembly (5) comprises a support plate (51), a coupling agent smearing unit, a transmission unit, a rotating unit and a cleaning brush (54); the support plate (51) is fixedly mounted on the bottom surface of the adjustment plate (34); the coupling agent smearing unit is fixedly mounted on one side of the support plate (51); the cleaning brush (54) located between the coupling agent smearing unit and the movable seat (42) is rotatably mounted on the other side of the support plate (51) through the rotating unit; and the rotating unit is transmission-connected to the movable seat (42) through the transmission unit; When the movable seat (42) moves past the position of the support plate (51), the bottom end of the transducer (44) moves past the top surface of the cleaning brush (54), and at the same time, the movable seat (42) drives the rotating unit and the cleaning brush (54) to rotate through the transmission unit, so that the cleaning brush (54) rotates and cleans the bottom surface of the transducer (44) when the transducer (44) passes through it.

2. The bridge deck crack detection device of a steel-concrete variable cross-section continuous box girder bridge according to claim 1 is characterized in that: The rotary drive unit comprises a through slot (31), a bracket (32) and an adjusting motor (33); the through slot (31) is formed on the bottom plate of the mobile vehicle (1); the bracket (32) is fixedly mounted in the through slot (31); the adjusting motor (33) is fixedly mounted at the bottom end of the bracket (32); and the output end of the adjusting motor (33) is drivingly connected to the adjusting plate (34); When the rotation drive unit is working, the adjustment motor (33) is turned on to drive the adjustment plate (34) to rotate, so as to adjust the adjustment plate (34) to an angle perpendicular to the bridge deck crack, thereby making the two transducers (44) symmetrically distributed on both sides of the bridge deck crack, and then the two moving seats (42) are driven to move in opposite directions at the same speed through the bidirectional translation drive unit, thereby driving the two transducers (44) to move in opposite directions at the same speed, so as to adjust the distance between the transducer (44) and the bridge deck crack.

3. The bridge deck crack detection device of a steel-concrete variable cross-section continuous box girder bridge according to claim 2 is characterized in that: The bidirectional translation driving unit comprises a rotating motor (45) and a double-threaded screw (46), wherein the double-threaded screw (46) is rotatably mounted on the bottom surface of the adjusting plate (34), and two sets of external threads in opposite directions are arranged at both ends of the double-threaded screw (46), and the two movable seats (42) are respectively threadedly mounted on the two ends of the double-threaded screw (46) through the two sets of external threads, and the top surfaces of the two movable seats (42) are both slidably connected to the bottom surface of the adjusting plate (34); The rotating motor (45) is fixedly mounted on the bottom surface of the adjusting plate (34), and the output end of the rotating motor (45) is transmission-connected to one end of the double-threaded screw rod (46); The external threads at both ends of the double-threaded screw rod (46) have the same pitch. When the bidirectional translation drive unit is working, the rotary motor (45) drives the double-threaded screw rod (46) to rotate, and during the rotation process, the double-threaded screw rod (46) drives the two moving seats (42) to move in opposite directions at the same speed through the external threads at both ends. This in turn drives the two transducers (44) to move in opposite directions at the same speed, so as to adjust and increase the distance between the two transducers (44) and the bridge deck crack, thereby facilitating the transducers (44) to detect the bridge deck crack at different positions away from the bridge deck crack.

4. The device for detecting cracks on the deck of a steel-concrete variable cross-section continuous box girder bridge according to claim 3 is characterized in that: The lifting drive unit comprises a hydraulic cylinder (47), a limiting column (48) and a lifting plate (49); the hydraulic cylinder (47) is fixedly mounted on the bottom surface of the movable seat (42), and the limiting columns (48) are fixedly mounted on both sides of the hydraulic cylinder (47); the lifting plate (49) is fixedly mounted on a telescopic rod at the bottom of the hydraulic cylinder (47), and both sides of the lifting plate (49) are slidably plug-connected with the limiting columns (48).

5. The bridge deck crack detection device of a steel-concrete variable cross-section continuous box girder bridge according to claim 4, characterized in that: A rotating seat (410) is fixedly mounted on the bottom end of the limiting column (48), a connecting shaft (411) is rotatably mounted on the bottom end of the rotating seat (410), a protective baffle (412) is fixedly mounted on the lower end of the connecting shaft (411), and one end of the protective baffle (412) abuts against the bottom surface of the transducer (44) for protection; A baffle driving gear (413) is fixedly mounted on the bottom end of the connecting shaft (411), and a baffle driving rack (414) tangential to the baffle driving gear (413) is fixedly mounted on one side of the bracket plate (51).

6. The device for detecting cracks on the deck of a steel-concrete variable cross-section continuous box girder bridge according to claim 5, characterized in that: The coupling agent smearing unit comprises a smearing head (52), a conduit (53) and a coupling agent storage bottle (58); the coupling agent storage bottle (58) is fixedly mounted on the back of the support plate (51); the outlet of the smearing head (52) is fixedly mounted on the bottom of the support plate (51) with the outlet facing upward; the coupling agent storage bottle (58) and the smearing head (52) are connected via the conduit (53); and a hydraulic pump (59) is mounted on the conduit (53); When the transducer (44) moves over the top of the coating head (52), the hydraulic pump (59) is turned on, and the coupling agent in the coupling agent storage bottle (58) is pumped out from the outlet on the top surface of the coating head (52) by the hydraulic pressure of the hydraulic pump (59), so that the coupling agent is coated on the bottom surface of the transducer (44).

7. The device for detecting cracks on the deck of a steel-concrete variable cross-section continuous box girder bridge according to claim 4, characterized in that: The transmission unit comprises a transmission shaft (55), a driven gear (56) and a translation rack (57); the transmission shaft (55) is rotatably mounted on the back side of the bracket plate (51); the driven gear (56) is fixedly mounted on the top end of the transmission shaft (55); and the translation rack (57) is fixedly mounted on the back side of the moving seat (42) and is tangent to the driven gear (56).

8. The device for detecting cracks on the deck of a steel-concrete variable cross-section continuous box girder bridge according to claim 7, characterized in that: The rotating unit comprises a driving wheel (510), a rotating shaft (512) and a driven wheel (513); the rotating shaft (512) is rotatably mounted on the bottom of the bracket plate (51); the cleaning brush (54) is fixedly mounted on the bottom end of the rotating shaft (512); the driven wheel (513) is fixedly mounted on the bottom end of the rotating shaft (512); the driving wheel (510) is fixedly mounted on the bottom end of the transmission shaft (55); and the driving wheel (510) and the driven wheel (513) are connected to each other by a transmission belt (511).

9. The device for detecting cracks on the deck of a steel-concrete variable cross-section continuous box girder bridge according to claim 6, characterized in that: The top surface of the coating head (52) is provided with a plurality of coupling agent outlets which are dispersedly arranged.

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