A bridge gap measurement system

Abstract

The present invention discloses a bridge gap measurement system, which belongs to the technical field of bridge detection. It is an improvement on the conventional bridge gap detection method. It adopts an arm assembly that can be driven up and down, left and right in a straight line, and up and down as a main structure for changing the detection direction of the detection end, and then uses the autonomous angle adjustment of the detection end as a "directional auxiliary means". Its purpose is to adapt to bridge detection surfaces of different forms by changing the steering form of the arm assembly and the detection end. At the same time, a pair of detection ends are symmetrically distributed and can be moved and retracted inward and outward, which can not only realize synchronous detection of both sides of the bridge bottom, but also avoid pier obstacles. In addition, a pair of veneer guide wheels are always rolled in contact with the bridge detection surface as a "veneer detection benchmark", so that during the continuous detection process, the detection distance between the detection end and the bridge detection surface is always consistent, which not only improves the detection stability, but also makes the collected data stable, and improves the accuracy of gap judgment.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge detection, and more specifically, to a bridge gap measurement system. Background Art

[0002] During the use of bridges, factors such as temperature changes, loads, and material expansion will cause the bridge structure to expand and deform, resulting in gaps between bridge components. If these gaps exceed the design specifications or there are abnormal conditions, they may affect the structural stability and safety of the bridge. Therefore, timely detection of gaps on the surface of the bridge is of great significance for predicting or promptly discovering engineering hazards, ensuring the reliable operation of the bridge, and extending the service life of the bridge.

[0003] At present, the inspection of the bottom of bridges is mainly carried out by technicians riding in the basket of a bridge inspection vehicle. The basket is extended to the bottom of the bridge through a crane arm for manual inspection. This inspection method requires technicians to work at high altitudes, and the inspection is time-consuming and has great safety hazards. In order to eliminate the disadvantages of manual inspection, a bridge bottom surface gap detection device is disclosed in the announcement No. CN112255237B, which adopts mechanical intelligent detection, installs guide rails on two mounting platforms, and cooperates with an inspection vehicle with image transmission equipment to slide along the guide rails, so as to record the situation of the bottom of the bridge and feed it back to the computer, and the technicians observe the bottom of the bridge on the bridge deck through the computer.

[0004] However, in the actual bridge inspection process, since some bridges are built with piers at the bottom, the U-shaped structure inspection device composed of a connecting frame, a mounting platform and a guide rail is difficult to move continuously and smoothly along the length of the bridge. In addition, for box girder bridges, the development of the gap in the box girder web is also an important indicator for calculating the safety of the bridge. Therefore, the horizontal linear guide rail inspection method cannot be used for gap inspection of box girder webs with curved surfaces, and there are detection limitations during the inspection process. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the horizontal linear guide rail type detection method in the prior art is not applicable to the gap detection of the web of a box girder with piers at the bottom, and to provide a bridge gap measurement system compared to the prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions: A bridge gap measurement system, comprising a mobile carrier that travels in a straight line along the length direction of the bridge, a power control end installed on the mobile carrier, and a detection end installed at the front of the power control end, the power control end comprising a fixed beam that is installed on the mobile carrier by a lifting frame, a pair of telescopic beams that penetrate through both ends of the fixed beam are installed in the fixed beam through a bidirectional linear motor, a mobile seat is fixed at the outer end of the pair of telescopic beams, and an arm assembly that can be turned up and down is installed on the mobile seat through a rotation of a driving motor;

[0007] The arm assembly includes a vertical beam rotatably mounted on the moving seat and forming a rotation angle with the horizontal plane thereof, a pair of electric push rods 1 extending outward are mounted on the vertical beam, a pair of electric push rods 1 telescopic ends are fixedly connected to a flip frame, a rotating box is rotatably mounted on the flip frame through a driving motor 2, and a pair of electric push rods 2 forming a detection angle with the electric push rod 1 are mounted on the rotating box;

[0008] The detection end includes a fixed seat fixedly mounted on the second telescopic end of the electric push rod, and a detection platform is rotatably mounted on the fixed seat by driving a third motor. A pair of veneer guide wheels that can roll along the box girder web and the end surface of the bridge bottom plate of the bridge are rotatably mounted on the detection platform, and an image acquisition device and a laser detection device arranged in the same direction as the veneer guide wheel are installed on one side of the detection platform.

[0009] Furthermore, a pair of movable seats are rotatably mounted on the lower ends of the side close to the telescopic beam with movable wheels that are in rolling contact with the bridge deck at the side of the bridge.

[0010] Furthermore, a turning groove for the upward and downward rotation of the rotating box is provided in the turning frame, and both ends of the rotating box are connected to the inner wall of the turning groove through a rotating shaft. One of the rotating shafts passes through the outer end of the turning frame and is fixed with an inner gear disk. The outer end wall of the turning frame is rotatably installed with an outer gear disk that meshes with the inner gear disk.

[0011] Furthermore, the left and right ends of the rotating box are fixed with guide heads located on the inner sides of a pair of electric push rods, and the left and right ends of the flip frame are fixedly connected with arc guide plates that are slidably adapted to the guide heads, so that the pair of guide heads are slidably installed on the pair of arc guide plates respectively.

[0012] Furthermore, a detection plate extending outwardly and used for fixing and installing the image acquisition device and the laser detection device is provided on one side of the bottom end of the detection platform, and a GPS positioning device is also installed on the side of the detection plate facing away from the laser detection device.

[0013] Furthermore, a pair of the veneer guide wheels are rotatably installed on the inspection table through a connecting shaft, one of the veneer guide wheels is provided with a connecting hole connected to the connecting shaft and extending through the outside, and a marking pad connected to the outer port of a slidingly adapted arc-shaped guide plate is embedded on the circumferential end wall of the veneer guide wheel.

[0014] Furthermore, a feeding spray gun is embedded and installed inside the testing platform, and the discharge port of the feeding spray gun passes through the injection pipe to the end of the connecting shaft, thereby realizing the connection between the feeding spray gun and the connecting hole.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] 1. This scheme is an improvement on the conventional bridge gap detection method. The engineering vehicle is used as a mobile carrier that moves linearly along the length of the bridge. The left and right sides of the mobile carrier are symmetrically distributed with detection ends extending to the bottom of the bridge through the arm assembly. The arm assembly that can be driven up and down, left and right linearly, and up and down is used as the main structure to change the detection direction of the detection end. The autonomous angle adjustment of the detection end is used as a "directional auxiliary means". Its purpose is to adapt to different bridge detection surface shapes by changing the steering shape of the arm assembly and the detection end. At the same time, a pair of detection ends are symmetrically distributed and can be moved inward and outward to achieve synchronous detection of both sides of the bridge bottom and avoid bridge pier obstacles.

[0017] 2. This solution adds a pair of veneer guide wheels on the detection end that are consistent with the direction of the image acquisition equipment and laser detection equipment. The pair of veneer guide wheels always roll in contact with the bridge detection surface as the "veneer detection benchmark", which not only improves the detection stability, but also ensures that during the continuous detection process, the image acquisition equipment and laser detection equipment on the detection table always keep the detection distance consistent with the bridge detection surface, so that the collected data is stable, thereby improving the accuracy of gap judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a working schematic diagram of the present invention when testing the bridge bottom plate;

[0019] Figure 2 It is a bottom view of the present invention when testing the bridge bottom plate;

[0020] Figure 3 It is a structural schematic diagram of the present invention;

[0021] Figure 4 It is a structural schematic diagram of a single arm assembly combined with a detection end of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the present invention when the overturning frame and the rotating box are detached;

[0023] Figure 6 This is a schematic diagram of the structure of the present invention after the detection end is set to be consistent with the extension and retraction direction of the electric push rod;

[0024] Figure 7 It is a working schematic diagram of the present invention when testing the web of a bridge box girder;

[0025] Figure 8 It is a structural schematic diagram of the detection end of the present invention;

[0026] Fig. 9 It is a partial cross-sectional view of the detection platform of the present invention.

[0027] Description of the numbers in the figure:

[0028] 1. Bridge; 101. Box beam web; 102. Bridge bottom plate; 2. Mobile carrier; 3. Fixed beam; 4. Telescopic beam; 5. Mobile seat; 501. Mobile wheel; 6. Driving motor 1; 7. Vertical beam; 8. Electric push rod 1; 9. Turning frame; 901. Turning groove; 902. Arc guide plate; 903. External gear disc; 10. Driving motor 2; 11. Rotating box; 111. Guide head; 112. Internal gear disc; 12. Electric push rod 2; 13. Fixed seat; 14. Inspection table; 15. Driving motor 3; 16. Veneer guide wheel; 161. Marking pad; 162. Connecting shaft; 17. Image acquisition equipment; 18. Laser detection equipment; 19. GPS positioning equipment; 20. Feeding spray gun; 201. Injection pipe. DETAILED DESCRIPTION

[0029] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0030] Embodiment 1: In view of the problem that the horizontal linear guide rail detection method in the prior art cannot be applied to the gap detection of the web of the box girder with piers at the bottom, the following technical solution is proposed:

[0031] A bridge gap measurement system, see Figure 1-Figure 3 , including a mobile carrier 2 that moves in a straight line along the length direction of the bridge 1, a power control end installed on the mobile carrier 2, and a detection end installed at the front of the power control end;

[0032] The power control end includes a fixed beam 3 installed on the mobile carrier 2 by a lifting frame. A pair of telescopic beams 4 are installed in the fixed beam 3 through the drive of a bidirectional linear motor and extend to both ends thereof. The outer ends of the pair of telescopic beams 4 are fixed with moving seats 5 that can move along the side end wall of the bridge 1. The lower ends of the pair of moving seats 5 close to the telescopic beam 4 are rotatably installed with moving wheels 501 that are in rolling contact with the side bridge deck of the bridge 1. Relying on the moving wheels 501, the moving seat 5 is moved along the forward direction of the bridge. A support arm assembly that can be flipped up and down is installed on the moving seat 5 through a driving motor 6.

[0033] See also Figure 3 , Figure 4 The arm assembly includes a vertical beam 7 rotatably mounted on the outer end of the moving seat 5, the vertical beam 7 and the horizontal straight line of the moving seat 5 form a rotation angle, a pair of electric push rods 8 extending outward are embedded and installed on the vertical beam 7, the telescopic ends of the pair of electric push rods 8 are fixedly connected to a flip frame 9, a rotating box 11 is rotatably mounted on the flip frame 9 through a driving motor 10, a pair of electric push rods 12 forming a detection angle with the electric push rod 8 are installed on the rotating box 11, and the detection end is installed on the telescopic end of the pair of electric push rods 12;

[0034] An arm assembly that can be driven up and down, left and right in a straight line, and up and down is used as the main structure for changing the detection direction of the detection end. Its purpose is to adjust the detection state of the detection end by changing the arm assembly, so as to adapt to different bridge detection surface shapes.

[0035] For detailed structure of the arm assembly, please refer to Figure 5 , a turning groove 901 for the turning box 11 to be turned up and down is provided in the turning frame 9, and both ends of the turning box 11 are connected to the turning groove 901 by a rotating shaft to rotate relative to the inner wall, one of the rotating shafts passes through the outer end of the turning frame 9 and is fixed with an inner toothed disc 112, and an outer toothed disc 903 meshing with the inner toothed disc 112 is rotatably installed on the outer end wall of the turning frame 9, and the outer toothed disc 903 is a hollow annular structure, and its inner ring is meshed with the outer ring of the inner toothed disc 112. During the rotation of the turning box 11, the inner toothed disc 112 and the outer toothed disc 903 are meshed and rotated relative to each other, thereby improving the stability of the turning box 11;

[0036] The left and right ends of the rotating box 11 are fixed with guide heads 111 located on the inner sides of a pair of electric push rods 12, and the left and right ends of the flip frame 9 are fixedly connected with arc guide plates 902 that are slidably adapted to the guide heads 111, so that the pair of guide heads 111 are respectively slidably installed on the pair of arc guide plates 902. By arranging the inner toothed disc 112 and the outer toothed disc 903 that are meshed with each other and the guide heads 111 and the arc guide plates 902 that are slidably connected with each other, it is beneficial to improve the stability of the detection end on the telescopic end of the electric push rod 12 driven by the rotating box 11 to flip up and down.

[0037] See also Figure 6 , Figure 7 The detection end includes a fixed seat 13 fixedly mounted on the telescopic end of a pair of electric push rods 12, and a detection platform 14 is rotatably mounted on the fixed seat 13 through a driving motor 15, and an image acquisition device 17 and a laser detection device 18 are installed on one side of the bottom end of the detection platform 14;

[0038] The detection platform 14 and the fixed seat 13 are set to be rotatable. When used to detect the curved surface of the box beam web 101, the detection platform 14 and the fixed seat 13 and the telescopic direction of the electric push rod 2 12 are parallel. The rotating box 11 is slowly rotated from top to bottom, and the electric push rod 1 8 that telescopes up and down and the electric push rod 2 12 that telescopes inside and outside are coordinated to realize that the detection ends of the image acquisition device 17 and the laser detection device 18 are aligned with the curved detection surface of the box beam web 101.

[0039] See also Figure 2-Figure 4 When the arc-shaped detection surface of the box beam web 101 is converted into the horizontal straight detection surface of the bridge bottom plate 102, the rotating box 11 is lowered, the rotating box 11 is connected to the electric push rod 2 12, and the detection end is located below the bridge bottom plate 102, and the detection platform 14 is rotated by the driving motor 3 15 until the detection platform 14 and the fixed seat 13 are in a vertical state. At this time, the detection ends of the image acquisition device 17 and the laser detection device 18 on the detection platform 14 are turned to align with the straight detection surface of the box beam web 101;

[0040] The detection surface of the bridge is adapted to the detection shape by changing the support arm assembly and the detection shape of the detection end, that is, the detection end can be smoothly converted from the detection of the box girder web 101 to the detection of the bridge bottom plate 102, thereby expanding the detection surface. At the same time, a pair of detection ends are symmetrically distributed and can be moved inward and outward to achieve synchronous detection of both sides of the bottom end of the bridge 1 and avoid obstacles from bridge piers.

[0041] Embodiment 2: Based on Embodiment 1, this embodiment improves the structure of the detection end to improve the detection effect, as follows:

[0042] See also Figure 4 , Figure 5 A pair of veneer guide wheels 16 are rotatably mounted on the detection platform 14 and can roll along the end faces of the box girder web 101 and the bridge bottom plate 102 of the bridge 1. The image acquisition device 17 and the laser detection device 18 are arranged in the same direction as the veneer guide wheels 16. A detection plate extending outward and used for fixing the image acquisition device 17 and the laser detection device 18 is provided on one side of the bottom end of the detection platform 14. The image acquisition device 17 and the laser detection device 18 are installed on the upper end of the detection plate. A GPS positioning device 19 is also installed on the side of the detection plate facing away from the laser detection device 18.

[0043] See also Figure 8The detection platform 14 is rotatably installed in the fixed seat 13 through a rotating shaft. A linkage shaft that penetrates the outside of the fixed seat 13 is fixed to the end of the rotating shaft away from the driving motor 3 15. The end wall of the linkage shaft is fixedly connected to the bottom end of the detection plate through a pair of armature rods, which is conducive to improving the stability of the detection plate and the detection platform 14 rotating together. The orientation of the detection end of the image acquisition device 17 and the laser detection device 18 is always consistent with the orientation of the veneer guide wheel 16 that adheres to the bridge detection surface;

[0044] Therefore, by changing the angle relationship between the detection platform 14 and the fixed seat 13, the detection platform 14 can adapt to the conversion from the detection of the box beam web 101 to the bridge bottom plate 102, improve the detection applicability, and change the detection form of the detection end in the two detection actions of arc detection and straight line detection, that is, by changing the telescopic steering form of the support arm assembly and the detection orientation form of the detection end to adapt to different detection surface forms of the bridge;

[0045] A pair of veneer guide wheels 16 are used as the "veneer detection benchmark" to always roll in contact with the bridge detection surface. The acquisition direction of the image acquisition device 17 and the laser detection device 18 is consistent with the rolling direction of the veneer guide wheels 16, so that the image acquisition device and the laser detection device on the detection platform are always positively aimed at the bridge detection surface, and the detection distance between the bridge detection surface is always consistent, so that the collected data is stable, thereby improving the accuracy of gap judgment.

[0046] See also Figure 8 , Fig. 9 A pair of veneer guide wheels 16 are rotatably mounted on the inspection platform 14 through a connecting shaft 162, wherein a connecting hole connected to the connecting shaft 162 and extending outward is provided inside one of the veneer guide wheels 16, and a marking pad 161 connected to the outer port of the slidingly adapted arc guide plate is embedded and installed on the circumferential end wall of the veneer guide wheel 16, and a feeding spray gun 20 is embedded and installed inside the inspection platform 14, and the discharge port of the feeding spray gun 20 passes through the injection pipe 201 to the end of the connecting shaft 162, so as to realize the connection between the feeding spray gun 20 and the connecting hole;

[0047] When a gap is detected on the inspection surface of the bridge, a proper amount of marking pigment is injected into one of the veneer guide wheels 16 using a feed spray gun 20. The marking pigment penetrates into the marking pad 161, and the veneer guide wheel 16 is rolled back and forth to mark the pigment at the gap. In conjunction with the GPS positioning device 19, the effect of the gap positioning marking is further improved. After the veneer guide wheel 16 is repeatedly rolled, the pigment on the marking pad 161 is coated and consumed, which does not affect subsequent inspections.

[0048] Example 3: This example describes the detection process in detail, as follows:

[0049] The bridge gap detection system also includes an image acquisition module, a laser depth detection module, and a GPS positioning module which are respectively connected to the image acquisition device 17, the laser detection device 18, and the GPS positioning device 19 by signal. The image acquisition module and the laser depth detection module are also signal-connected to the gap information extraction module and the data analysis module.

[0050] The image acquisition module acquires the bridge deck image of the bridge detection surface acquired by the image acquisition device 17, extracts the gap appearance features of the bridge deck image, the gap appearance features include gap color features and gap texture features, and marks the bridge deck image as a normal bridge deck image and an abnormal bridge deck image based on whether the bridge deck image has the gap appearance features;

[0051] The laser depth detection module obtains the gap depth characteristics collected by the laser detection device 18. The laser detection device 18 uses a laser generator. The laser detection device 18 emits a laser beam to the bridge detection surface marked as an abnormal bridge deck image to obtain the gap depth characteristics of the abnormal bridge deck image. When the abnormal bridge deck image has a gap depth characteristic, it is determined that the bridge detection surface at that location has a gap risk, and the bridge detection surface is marked as a bridge risk detection surface, and the abnormal bridge deck image is marked as a confirmed gap bridge deck image.

[0052] The gap information extraction module obtains the apparent cross-sectional size of the gap of the bridge deck image confirmed by the image acquisition module, and obtains the maximum gap depth of the bridge deck image confirmed by the laser depth detection module;

[0053] The data analysis module obtains the apparent cross-sectional size of the gap and the maximum gap depth, and compares the apparent cross-sectional size of the gap and the maximum gap depth with the preset apparent cross-sectional size threshold and the preset gap depth threshold respectively:

[0054] When the apparent cross-sectional size of the gap is greater than the preset gap apparent cross-sectional size threshold and the maximum gap depth is greater than the preset gap depth threshold, a first-level warning signal is generated; when the apparent cross-sectional size of the gap is greater than the preset gap apparent cross-sectional size threshold and the maximum gap depth is less than or equal to the preset gap depth threshold or the apparent cross-sectional size of the gap is less than or equal to the preset gap apparent cross-sectional size threshold and the maximum gap depth is greater than the preset gap depth threshold, a second-level warning signal is generated; when the apparent cross-sectional size of the gap is less than the preset gap apparent cross-sectional size threshold and the maximum gap depth is less than the preset gap depth threshold, a third-level warning signal is generated;

[0055] The GPS positioning module obtains the gap position of the bridge risk detection surface collected by the GPS positioning device 19.

[0056] The two crack detection means, image acquisition device 17 and laser detection device 18, are coordinated and cooperated. Whether the image acquisition device 17 captures the apparent crack features of the bridge deck image is used as a preliminary judgment on whether there is a crack abnormality on the bridge deck. Whether the laser detection device 18 captures the crack depth features of the abnormal bridge deck image is used as a secondary judgment on the existence of bridge deck cracks, thereby improving the judgment accuracy. Then, based on the acquired crack apparent cross-sectional dimensions and maximum crack depth of the bridge risk detection surface, the risk level of the bridge risk detection surface is analyzed and evaluated, and the crack position of the bridge risk detection surface is obtained through the GPS positioning device 19.

[0057] In summary, the present invention improves the conventional bridge gap detection method, uses an engineering vehicle as a mobile carrier 2 that moves linearly along the forward direction of the bridge 1, and the left and right sides of the mobile carrier 2 are symmetrically distributed with detection ends extending to the bottom of the bridge 1 through the support arm assembly. The support arm assembly that can be driven up and down, left and right linearly, and up and down is used as the main structure for changing the detection direction of the detection end, and the autonomous angle adjustment of the detection end is used as a "directional auxiliary means". Its purpose is to adapt to different forms of bridge detection surfaces by changing the steering form of the support arm assembly and the detection end, that is, the detection end can smoothly switch from detecting the box beam web 101 to detecting the bridge bottom plate 102, thereby expanding the detection surface and improving applicability.

[0058] At the same time, a pair of detection ends are symmetrically distributed and can be moved inward and outward, which can not only realize the simultaneous detection of both sides of the bottom of the bridge 1, but also avoid the obstacles of the bridge piers;

[0059] In addition, a pair of veneer guide wheels 16 are added to the detection end, which are consistent with the detection surface orientation of the image acquisition device 17 and the laser detection device 18. During the detection process, the pair of veneer guide wheels 16 always roll in contact with the bridge detection surface as a "veneer detection benchmark" to ensure that during the continuous detection process, the image acquisition device 17 and the laser detection device 18 on the detection platform 14 always keep the detection distance consistent with the bridge detection surface, so that the collected data is stable and accurate, thereby improving the accuracy of gap judgment.

[0060] The above are only preferred specific implementation modes of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A bridge gap measurement system, comprising a mobile carrier (2) moving in a straight line along the length direction of a bridge (1), a power control end mounted on the mobile carrier (2), and a detection end mounted at the front of the power control end, characterized in that: The power control end comprises a fixed beam (3) which is installed on the mobile carrier (2) by means of a lifting frame, a pair of telescopic beams (4) which are respectively installed in the fixed beam (3) and are driven by a bidirectional linear motor and extend to both ends thereof, a moving seat (5) is fixed to the outer ends of the pair of telescopic beams (4), and an arm assembly is installed on the moving seat (5) to rotate by means of a driving motor (6); The support arm assembly comprises a vertical beam (7) rotatably mounted on the moving seat (5) and forming a rotation angle with the horizontal plane thereof, a pair of electric push rods (8) are mounted on the vertical beam (7), a turning frame (9) is fixed to the telescopic ends of the pair of electric push rods (8), a turning box (11) is rotatably mounted on the turning frame (9) by driving a second motor (10), and a pair of electric push rods (12) are mounted on the turning box (11) and are arranged in parallel and form a detection angle with the electric push rods (8); The detection end comprises a fixed seat (13) fixedly mounted on the telescopic end of the second electric push rod (12); a detection platform (14) is rotatably mounted on the fixed seat (13) by driving a third motor (15); a pair of veneer guide wheels (16) that can roll along the detection surface of the bridge (1) are rotatably mounted on the detection platform (14); the veneer guide wheels (16) always roll in contact with the detection surface of the bridge (1); and an image acquisition device (17) and a laser detection device (18) arranged in the same direction as the veneer guide wheels (16) are mounted on one side of the detection platform (14); When used to detect the curved surface of the web of the box beam, the detection table is parallel to the fixed seat and the extension direction of the electric push rod 2, and the rotating box is slowly rotated from top to bottom, and the electric push rod 1 that extends up and down and the electric push rod 2 that extends inside and outside are coordinated to realize that the detection end of the image acquisition equipment and the laser detection equipment is aligned with the curved detection surface of the web of the box beam; When the curved detection surface of the box girder web is converted into a horizontal straight detection surface of the bridge bottom plate, the rotating box is lowered, the rotating box is connected to the electric push rod 2, and the detection end is located below the bridge bottom plate. The detection platform is rotated by the driving motor 3 until the detection platform and the fixed seat are in a vertical state.

2. A bridge gap measurement system according to claim 1, characterized in that: The lower ends of a pair of the movable seats (5) close to the telescopic beam (4) are both rotatably mounted with movable wheels (501) that are in rolling contact with the side bridge deck of the bridge (1).

3. A bridge gap measurement system according to claim 1, characterized in that: The turning frame (9) is provided with a turning groove (901), and both ends of the turning box (11) are connected to the turning groove (901) via a rotating shaft so as to be rotatable relative to the inner wall. One of the rotating shafts passes through the outer end of the turning frame (9) and is fixed with an inner toothed disc (112). The outer end wall of the turning frame (9) is rotatably mounted with an outer toothed disc (903) meshing with the inner toothed disc (112).

4. A bridge gap measurement system according to claim 3, characterized in that: Guide heads (111) are fixed to both left and right ends of the rotating box (11), and arc-shaped guide plates (902) slidably matched with the guide heads (111) are fixedly connected to both left and right ends of the turning frame (9).

5. The bridge gap measurement system according to claim 1, characterized in that: A detection plate extending outward and used for fixing and mounting the image acquisition device (17) and the laser detection device (18) is provided on one side of the bottom end of the detection platform (14), and a GPS positioning device (19) is also installed on the side of the detection plate facing away from the laser detection device (18).

6. A bridge gap measurement system according to claim 1, characterized in that: A pair of the veneer guide wheels (16) are rotatably mounted on the inspection platform (14) via a connecting shaft (162), wherein a connecting hole connected to the connecting shaft (162) and extending outward is provided inside one of the veneer guide wheels (16), and a marking pad (161) connected to an outer port of a slidingly adapted arc-shaped guide plate is embedded and mounted on a circumferential end wall of the veneer guide wheel (16).

7. A bridge gap measurement system according to claim 6, characterized in that: A feeding spray gun (20) is embedded and installed inside the testing platform (14), and the discharge port of the feeding spray gun (20) passes through the injection pipe (201) to the end of the connecting shaft (162).

Images