A bridge detection method

Abstract

This application relates to a bridge detection method, belonging to the technical field of bridge detection, which comprises the following steps: S1, installing a lighting cloth; installing tracks along the length direction of the bridge on both sides of the bridge, installing at least two wire winders capable of moving along the tracks on the same track, and a cable longer than the height of the bridge is wound on the wire winder; laying a square lighting cloth on the ground under the bridge, fixing the cable to the lighting cloth; and installing a lighting lamp on the lighting cloth; starting the wire winder to wind the cable, lifting the lighting cloth until it is close to the bottom of the bridge; S2, bottom-of-bridge camera shooting; controlling the aerial camera to enter between the lighting cloth and the bottom of the bridge for shooting. This application has the advantage that the process of the camera shooting the cracks at the bottom of the bridge is similar to the effect of shooting under natural light.

Description

Technical Field

[0001] This application relates to the technical field of bridge inspection, and in particular, to a bridge inspection method. Background Art

[0002] Bridges need to bear their own dead weight as well as the moving loads of vehicles, pedestrians, etc. passing on them. Currently, most bridges are cast with reinforced concrete, and concrete, as a brittle material, is very prone to cracking. Therefore, regular crack detection of in-service bridges is very important and essential.

[0003] Among them, crack detection at the bottom of the bridge is particularly difficult. Not only is it difficult to observe due to the dim environment at the bottom of the bridge, but also because the bridge is relatively high, and the risk of measuring cracks at the bottom is very high. Since the height of the engineering vehicle set at the bottom of the bridge is difficult to meet the requirements, currently, when collecting crack data at the bottom of the bridge, an engineering vehicle is usually set on the bridge deck, so that the engineering vehicle extends a cantilever towards the bottom of the bridge, and the inspection personnel stand on the cantilever to measure the cracks. However, the measurement range of this measurement method is very limited. For safety considerations, the cantilever cannot extend too long, so the engineering vehicle needs to move along the bridge deck and measure on both sides respectively. In this way, not only is the measurement efficiency low, but also the traffic area on the bridge deck is occupied.

[0004] To solve the aforementioned problems, a camera inspection method has emerged to replace manual measurement. The inspection personnel take pictures of the cracks through a camera and then analyze the images, which greatly saves the previous measurement time. However, due to the dim environment at the bottom of the bridge, and the camera directly shines light on the object to be photographed, it is very easy to cause reflection and result in insufficient image clarity. Therefore, a bridge inspection method is needed to make the camera shooting process have the same effect as shooting under natural light. Summary of the Invention

[0005] In order to make the process of the camera shooting cracks at the bottom of the bridge have the same effect as shooting under natural light, this application provides a bridge inspection method.

[0006] This application provides a bridge inspection method, adopting the following technical solution:

[0007] A bridge inspection method includes the following steps:

[0008] S1, install a lighting cloth;

[0009] Install tracks along the length direction of the bridge on both sides of the bridge, and install at least two wire reels that can move along the tracks on the same track. A cable with a length greater than the height of the bridge is wound on the wire reels;

[0010] Lay a square light cloth on the ground under the bridge, fix the cable on the light cloth, and install a light on the light cloth. Start the winch to wind up the cable and lift the light cloth until it is close to the bottom of the bridge.

[0011] S2, camera shooting at the bottom of the bridge;

[0012] Control the aerial drone to enter the area between the light cloth and the bottom of the bridge for shooting.

[0013] By adopting the above technical solution, the lamp tube of the light on the light cloth shines downward, and the light is scattered to illuminate the bottom of the bridge through the diffuse reflection of the light cloth with an unfixed shape, which not only solves the problem of dim light at the bottom of the bridge, but also does not cause the problem of reflection due to direct light irradiation, which can kill two birds with one stone. Since the light cloth is made of flexible material and will change with external force, it simulates the diffuse reflection of sunlight. Compared with plane reflection, the light of diffuse reflection is softer and more suitable as the light during the shooting process.

[0014] In addition, the winch can move along the track. After the aerial drone completes the shooting of the bottom of the bridge within the coverage range of the light cloth, moving the winch can shoot other areas of the bottom of the bridge, avoiding repeated disassembly and installation, not occupying the traffic space on the bridge deck, and improving the measurement effect. After the aerial drone completes the shooting of the bottom of the bridge within the range of 30m - 50m between two adjacent bridge piers, release the winch and remove the light cloth. After moving the winch to the position where measurement is required, install the light cloth again to measure the area between the other two bridge piers. The operation is convenient and fast, takes a short time to occupy the ground area, and has little impact on the traffic at the bottom of the bridge.

[0015] Optionally, in S1, after the light cloth is lifted, turn off the winch and adjust the position of the winch on the track to reduce the sag at the bottom of the light cloth.

[0016] By adopting the above technical solution, after the polishing cloth is lifted, the cable bears all the weight of the polishing cloth. If the positions of the cable and the polishing cloth do not correspond, the middle part of the polishing cloth will sag. The flatness of the polishing cloth can be adjusted by adjusting the position of the wire reel on the track, and the cable is made close to vertical, which makes the operation more convenient. If the position of the wire reel is adjusted to correspond to the polishing cloth before the polishing cloth is lifted, the adjustment will be difficult due to the high height of the bridge, and there will be a large error in alignment. If the wire reel is adjusted when the polishing cloth has just left the ground and is far away from the bottom of the bridge, the adjustment will be difficult due to the process of the cable being pulled downward, under the influence of factors such as wind, and the longer the cable, the more serious the retraction of the polishing cloth, the greater the deflection in the middle, and the more difficult the adjustment process. Therefore, through the technical solution of the present application, it is most convenient and accurate to adjust the wire reel when the polishing cloth is lifted to a position close to the bottom of the bridge. In addition, if the reel intersects too far with the corresponding position on the polishing cloth, you can also make a rough adjustment before lifting to make the reel and the position on the polishing cloth close, and then make a fine adjustment after the polishing cloth is lifted, so that the polishing cloth is nearly flat and the cable can be relatively vertical.

[0017] Optionally, in S1, a moving vehicle is installed on the track, the cable reel is installed on the moving vehicle, and the moving vehicle is wirelessly controlled and can move along the track.

[0018] Optionally, a fixed pulley is installed on the mobile vehicle, the fixed pulley is located below the wire reel, and the cable is wound around the fixed pulley for several turns.

[0019] By adopting the above technical solution, the mobile vehicle can move more conveniently on the track, and it is convenient to install the reel and the fixed pulley. The setting of the fixed pulley can guide the cable and reduce the probability of the cable getting stuck on the reel. And winding the cable on the fixed pulley can stabilize the cable on the fixed pulley, thereby improving the stability of the cable at the outlet position of the reel.

[0020] Optionally, in S1, a mounting block is fixed on the lighting cloth, the lighting lamp is installed on the mounting block, and a lifting ring is provided on the mounting block; a locking buckle is installed at the end of the cable, and the locking buckle can be buckled on the lifting ring.

[0021] Optionally, a slope is provided on the mounting block on one side facing the middle of the lighting cloth, and the lighting lamp is mounted on the slope, and the lighting lamp is parallel to one of the diagonal lines of the lighting cloth.

[0022] Optionally, two holes are opened on the mounting block, and through holes are cut on the polishing cloth at positions corresponding to the holes of the mounting block. Two ends of the rope are passed through the two through holes and the two holes in turn and tied to the top of the mounting block.

[0023] By adopting the above technical solution, the installation block can improve the installation strength and stability of the light-emitting cloth. The installation block is a rigid structure that can shape and stabilize the connection position of the light-emitting cloth, thereby reducing the probability of the light-emitting cloth winding and deforming under the action of wind force. At the same time, installing the light-emitting lamp on the installation block can also improve the structural stability of the light-emitting lamp and reduce the probability of the light-emitting lamp being damaged due to impact during the movement of the light-emitting cloth. Fixing through the through holes on the light-emitting cloth and the channels on the installation block is convenient for installation and disassembly, and can enhance the fixing strength of the light-emitting cloth.

[0024] Optionally, after laying the light-emitting cloth on the ground, place a circle of metal wires around the edge of the light-emitting cloth, apply glue on the metal wires, and fold the edge of the light-emitting cloth to wrap the iron wire inside the light-emitting cloth to form a hem.

[0025] By adopting the above technical solution, the stability of the edge of the light-emitting cloth is improved, which is beneficial for the light-emitting cloth to resist wind loads.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects:

[0027] 1. Using the light-emitting cloth to diffusely reflect the light emitted downward by the light-emitting lamp upward, so as to softly illuminate the bottom of the bridge, which is convenient for the aerial drone to take pictures of the bottom of the bridge;

[0028] 2. Setting the installation block to connect the cable and the light-emitting cloth, which is convenient for installing the light-emitting lamp on the installation block. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0030] Figure 2 is Figure 1 the overall structural schematic diagram of the light-emitting cloth in

[0031] In the figure, 1, track; 2, moving vehicle; 21, wire reel; 22, fixed pulley; 3, light-emitting cloth; 31, iron wire; 32, hem; 33, through hole; 331, metal ring; 4, installation block; 41, channel; 42, light-emitting lamp; 43, hanging ring; 5, cable; 51, buckle; 6, rope; 7, aerial drone. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following further elaborates on the present application in Figure 1-2 combination with the attached

[0033] Refer to Figure 1-2 and the embodiment of the present application discloses a bridge detection method, including the following steps:

[0034] S1, install the light-emitting cloth 3;

[0035] S1-1, Hoisting equipment installation;

[0036] Install track 1 on the bridge railing. Track 1 is along the length direction of the bridge deck, and the outside of track 1 faces outward. Install moving vehicle 2 on track 1. Moving vehicle 2 can be controlled by a remote control to move along track 1. Moving vehicle 2 is set to brake after stopping to prevent it from moving along track 1 under external forces such as wind.

[0037] Install wire reel 21 and fixed pulley 22 on moving vehicle 2. Wire reel 21 is installed above fixed pulley 22. Pull out cable 5 from wire reel 21 and lower the end of cable 5 to the ground at the bottom of the bridge. Install buckle 51 at the end of cable 5 on the ground. Wind the cable 5 near fixed pulley 22 around the outside of fixed pulley 22 for several turns.

[0038] Install multiple fixed pulleys 22 on the railing on both sides of the bridge deck in the above manner. At least two are provided on each side of the railing. In this embodiment of the application, two are taken as an example for illustration, and the fixed pulleys 22 on the two railings correspond one by one.

[0039] S1-2, Arrangement of lighting cloth 3;

[0040] Lay a quadrilateral lighting cloth 3 at the bottom of the bridge. Glue metal wires on the edge of lighting cloth 3. In this embodiment of the application, iron wire 31 is used. Iron wire 31 winds around lighting cloth 3 for one circle. Apply glue on iron wire 31 and fold the edge of lighting cloth 3 to wrap iron wire 31 inside lighting cloth 3 to form edge wrapping 32. Flip lighting cloth 3 so that the connection seam of edge wrapping 32 faces downward.

[0041] Cut through holes 33 at the four corners and four edges of lighting cloth 3. The through holes 33 are in groups of two, and the number of groups of through holes 33 is the same as the number of fixed pulleys 22. In this embodiment of the application, it is taken as an example that a group of through holes 33 are respectively provided at the four corners. The through holes 33 at each corner are respectively located on both sides of the diagonal where the corner is located. Fix metal rings 331 at the positions of through holes 33 for edge wrapping and fixing to prevent the lighting cloth 3 at the edge of through holes 33 from splitting.

[0042] Take four ropes 6. The two ends of rope 6 respectively pass through the two metal rings 331 at the same corner of lighting cloth 3, and the two ends of rope 6 are located above lighting cloth 3. Take installation block 4 and place it at the corner of lighting cloth 3. Installation block 4 is a cuboid structure, and one of its edges is an inclined plane. Two through holes 33 are vertically and penetratingly opened on the side wall of installation block 4 perpendicular to the inclined plane. A lifting ring 43 is fixed on one side of installation block 4 where the through holes 33 are opened. Place the other side of installation block 4 with hole channels 41 on lighting cloth 3 so that the inclined plane faces the middle of lighting cloth 3.

[0043] Pass the two ends of the two ropes 6 through the two channels 41 of the mounting block 4 respectively, and tie knots at the top of the mounting block 4 for fixation. Install a spotlight 42 on the inclined surface of the mounting block 4. The spotlight 42 is selected from commercially available categories of spotlights 42, and its size and brightness are coordinated according to the size of the lighting cloth 3. The spotlight 42 and the mounting block 4 can be fixed by using angle brackets or other common lighting fixture fixing methods. The spotlight 42 is controlled remotely, and the control distance exceeds the height of the bridge deck.

[0044] The aforementioned S1-1 and S1-2 are carried out synchronously.

[0045] S1-3, hoist the lighting cloth 3;

[0046] Fasten the buckles 51 of the four guy wires 5 to the lifting rings 43 of the four mounting blocks 4 respectively. Control the winch 21 to wind up the guy wires 5 so that the guy wires 5 are in a straight state while the lighting cloth 3 is still on the ground. The air moving vehicle 2 moves on the track 1 to roughly adjust the position of the winch 21 so that the winch 21 corresponds to the four corners of the lighting cloth 3. Then start the winch 21 to continue winding up, and the lighting cloth 3 moves upward. When the four corners of the lighting cloth 3 are close to the bottom of the bridge, turn off the winch 21, and control the moving vehicle 2 to move to adjust the deflection at the bottom of the lighting cloth 3 so that the lighting cloth 3 tends to be flat, and at the same time the guy wires 5 are in a relatively vertical state.

[0047] Continue to start the winch 21 to wind up so that the lighting cloth 3 approaches the bottom of the bridge, and turn off the winch 21 so that there is an interval between the edge of the lighting cloth 3 and the bottom of the bridge deck that can allow the aerial drone 7 to enter and move freely between the bottom of the bridge and the lighting cloth 3.

[0048] S2, bottom-of-bridge imaging;

[0049] Pre-set the zero position on the main unit supporting the aerial drone 7 and set the running path of the aerial drone 7. Control the aerial drone 7 to run to the zero coordinates for alignment, and start the aerial photography. The aerial drone 7 enters from the interval between the lighting cloth 3 and the bottom of the bridge and moves at the bottom of the bridge, thereby outputting the panoramic view of the entire bottom of the bridge. The camera of the aerial drone 7 is located at the top of the fuselage, which is convenient for photographing the crack conditions at the bottom of the bridge.

[0050] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A bridge detection method, characterized in that: It includes the following steps: S1. Install the polishing cloth (3). The polishing cloth (3) is made of flexible material and will change with external force. Install tracks (1) along the length direction of the bridge on both sides of the bridge. Install at least two wire reels (21) that can move along the tracks (1) on the same track (1). A cable (5) with a length greater than the height of the bridge is wound on the wire reel (21). Lay a square polishing cloth (3) on the ground under the bridge. Fix the cable (5) to the polishing cloth (3); and install a spotlight (42) on the polishing cloth (3). Start the wire reel (21) to wind up the cable (5) to lift the polishing cloth (3) until it is close to the bottom of the bridge. S2. Image the bottom of the bridge. Control the aerial drone (7) to enter the space between the polishing cloth (3) and the bottom of the bridge for shooting. In S1, fix an installation block (4) on the polishing cloth (3). The spotlight (42) is installed on the installation block (4), and a lifting ring (43) is provided on the installation block (4). Install a buckle (51) at the end of the cable (5), and the buckle (51) can be buckled to the lifting ring (43). On one side of the installation block (4) facing the middle of the polishing cloth (3), an inclined surface is provided. The spotlight (42) is installed on the inclined surface, and the spotlight (42) is parallel to one of the diagonals of the polishing cloth (3). Two channels (41) are opened on the installation block (4). Through holes (33) are cut at the positions on the polishing cloth (3) corresponding to the channels (41) of the installation block (4). Take both ends of a rope (6) and pass them through the two through holes (33) and the two channels (41) in sequence and tie them to the top of the installation block (4).

2. The bridge detection method according to claim 1, characterized in that: In S1, after the polishing cloth (3) is lifted, turn off the wire reel (21), adjust the position of the wire reel (21) on the track (1) to reduce the sag at the bottom of the polishing cloth (3).

3. The bridge detection method according to claim 1, characterized in that: In S1, install a moving vehicle (2) on the track (1). The wire reel (21) is installed on the moving vehicle (2). The moving vehicle (2) is wirelessly controlled and can move along the track (1).

4. A bridge detection method according to claim 3, characterized in that: Install a fixed pulley (22) on the moving vehicle (2). The fixed pulley (22) is located below the wire reel (21), and the cable (5) is wound around the fixed pulley (22) for several turns.

5. A bridge detection method according to claim 1, characterized in that: In S1, after laying the polishing cloth (3) on the ground, place a circle of metal wire around the edge of the polishing cloth (3), apply glue on the metal wire, and fold the edge of the polishing cloth (3) to wrap the iron wire (31) inside the polishing cloth (3) to form a hem (32).

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