Painpoints
Traditional bridge inspections often necessitate workers climbing the structures or utilizing aerial work platforms, presenting significant safety hazards, particularly under adverse weather conditions.
Manual inspections can be time-intensive, especially for expansive bridges, leading not only to prolonged durations but also potential traffic disruptions.
Bridge inspections demand considerable manpower and specialized equipment, such as aerial work platforms and hanging baskets, which escalate the costs.
Manual inspections might not encompass all bridge areas, particularly those that are challenging to access, potentially resulting in incomplete data and compromising the accuracy of the inspection outcomes.
The effective analysis and processing of extensive data collected remain a challenge. Conventional methods typically depend on manual recording and analysis, which are inefficient and susceptible to errors.
Advantages
Enable the inspection of hard-to-reach areas, such as high altitudes or confined spaces, without endangering inspection personnel.
Expedite the coverage of extensive bridge structures through automated mission planning or manual control, diminishing inspection durations and eliminating coverage gaps.
Lower inspection costs and enhance inspection frequency with user-friendly and economical drone solutions.
Drones, outfitted with high-resolution cameras and additional sensors, can detect minute details, such as fine cracks, corrosion, and other structural issues. This data can be further analyzed using image processing software to heighten inspection precision.
Produce high-quality data that can be archived and scrutinized for ongoing bridge health monitoring. By comparing data across different time points, it is feasible to detect trends in the bridge’s structural integrity and preemptively alert to potential issues.
Drone Platform
DJI Matrice 400
Weight: 9740±40 g (with batteries)
Max Takeoff Weight: 15.8 kg
Max Payload: 6 kg
Max Flight Time: 59 minutes
Max Horizontal Speed: 25 m/s
Sensing System: Omnidirectional binocular vision system (surround view provided by full-color fisheye vision sensors), horizontal rotating LiDAR, upper LiDAR, downward 3D infrared range sensor, and six-direction mmWave radar
Environment Adaptability: IP55 rating, max takeoff altitude 7000 m, operating temperature -20° to 50° C (-4° to 122° F)
Payload Compatibility: Zenmuse H30 Series, Zenmuse L2, Zenmuse P1, Zenmuse V1, Zenmuse S1, and third-party payloads
Payload and Software
Zenmuse P1
Camera Sensor: 45 MP full-frame
Shutter: Global mechanical shutter, 1/2000 s
Gimbal: 3-axis stabilized gimbal with Smart Oblique Capture
DJI Pilot 2
Ground control.
DJI Terra
Modeling and flight mission plan
Workflow
1 Mission Planning:
– Using third-party software, plan an inspection waypoint route based on bridge 3D models or use live mission recording with AI spot checking in the DJI Pilot 2 to create a routine inspection route.
2 Data Collection:
– Import the flight route into Pilot 2 and execute the mission. Turn on the RTK for better results.
3 Data Processing:
– Reconstruct vertical 2D models through DJI Terra. Improve model texture by editing it using DJI Modify.
4 Data Analysis:
– Analyze the inspection photos or detail modes to identify and locate any defects. Document the required maintenance using the images or model findings.
Drone Platform
Matrice 350 RTK
Weight: Approx. 6.47 kg (with single downward gimbal and two TB65 batteries)
Max Flight Time: 55 minutes
Sensing System: Six-directional sensing and positioning
Environment Adaptability: IP55; max service ceiling above sea level 7,000 m (with 1676 propellers, without other payload); max wind resistance 12 m/s
Payload and Software
Zenmuse P1
Camera Sensor: 45 MP full-frame
Shutter: Global mechanical shutter, 1/2000 s
Gimbal: 3-axis stabilized gimbal with Smart Oblique Capture
Zenmuse L2
Integrates frame LiDAR, a self-developed high-accuracy IMU system, and a 4/3 CMOS RGB mapping camera.
Coverage: 2.5 km² per flight
Detection Range: 250 m @ 10 % reflectivity, 100 klx
Effective Point Cloud Rate: 240 000 pts/s
Returns: Supports 5 Returns
Solution: Turnkey Solution
DJI Pilot 2
Ground control.
DJI Modify
Intelligent 3D model editing software
DJI Terra
Modeling and flight mission plan
Workflow
1 Data Collection:
– Using the DJI Pilot 2 app and the 3D Mapping Flight Mission feature, captured the data with the Zenmue L2 to generate a 3D point cloud model of the bridge or generate a photogrammetry 3D model using the Zenmuse P1.
2 Data Processing:
– Input the data to DJI Terra, then reconstuct a high resolution 3D model.
– Use DJI modify to remove the floating, black hole, which will improve model appereance.
3 Data Analysis:
– Share the models as digital twin BIM to get the overview enviroment and set up suitable maintanence plan.
Drone Platform
DJI Matrice 4E
Weight: 1219 g (with propellers)
Max Flight Time (without wind): 49 minutes
Environment Adaptability: Max takeoff altitude 6000 m, max wind speed resistance 12 m/s
Sensing System: Omnidirectional binocular vision system, supplemented with a 3D infrared sensor at the bottom of the aircraft
Mechanical Shutter Speed: 2–1/2000 s, minimum photo interval 0.5 s
Wide-Angle Camera: 4/3-inch CMOS, 20MP effective pixels
Medium Tele Camera: 1/1.3-inch CMOS, 48MP effective pixels
Telephoto Camera: 1/1.5-inch CMOS, 48MP effective pixels
Laser Rangefinding: 1800 m measurement range (1 Hz) @20% reflectivity target
Payload and Software
DJI Pilot 2
Ground control.
Workflow
1 Mission Planning:
– Using the DJI Pilot 2 app and the 3D Mapping Flight Mission feature, generate a model of the bridge to be used as a reference for detailed inspection planning.
– Use software like DJI Terra or DJI FlightHub 2 to plan inspection flight routes based on high-definition 3D models of the bridge using Slope Mission and Geometric Flight Mission.
2 Data Collection:
– Upload the flight path to the Matrice 4E drone. The drone automatically execute pre-planned flight route, capturing inspection photos. Complement the data collection by manually flying into hard to reach locations and capture different angles of the bridge.
3 Data Analysis:
– Review the images manually or import to a third-party software to identify structure defects using model detection.
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