Emergency Bridge Inspection After a Major Rainstorm
After a major rainstorm in a city, drones were used to rapidly inspect 20 bridges for safety, promptly identifying 3 major potential hazards.
Why Is Traditional Bridge Inspection Becoming More Difficult?
As bridge scale continues to grow and maintenance standards keep rising, traditional manual inspection and ordinary drone aerial survey solutions can no longer meet the safety, efficiency and digital management requirements of complex bridge scenarios.
| Comparison Item | Traditional Manual | Ordinary RTK Drone | Riejian Solution |
|---|---|---|---|
| Navigation Capability |
Relies on human visual observation
|
GPS failure
|
SLAM autonomous navigation
|
| Inspection Coverage |
Limited to scaffolding range
|
Cannot enter box girders
|
Full component coverage
|
| Detection Capability |
High manual detection error
|
No AI analysis
|
Automatic AI identification
|
| Data Management |
Data cannot be accumulated
|
Photos only
|
Digital asset archives
|
| Safety Risk |
High-altitude danger
|
High safety factor
|
Zero safety risk
|
| Traffic Impact |
Long road closures
|
Minimal impact
|
No road closure needed
|
Bridge Inspection ≠ Ordinary Aerial Survey
Bridge inspection is not simply "fly around and take photos".
Real bridge inspection requires solving engineering challenges such as autonomous flight in complex spaces, positioning without GPS, intelligent defect identification, and digital deliverable generation.
Ordinary Aerial Survey
Depends on GPS Signals
Weak or no GPS signals under beam bottoms and inside box girders make precise positioning impossible
Cannot Enter Box Girders
Ordinary drones cannot autonomously navigate and avoid obstacles in confined spaces
Requires Manual Control
Requires professional pilots and cannot achieve fully autonomous inspection
No Automatic AI Detection
Can only take photos, cannot automatically identify and analyze bridge defects
Cannot Produce Standardized Deliverables
Lacks standardized data analysis and report generation capabilities
Riejian Core Technologies
Four core technologies build an industry-leading intelligent bridge inspection solution
01 GPS-Free Autonomous Navigation
Precise Autonomous Flight Even When GPS Is Denied
For satellite-signal-denied environments such as bridge beam bottoms and box girders, Riejian's self-developed multi-sensor fusion SLAM navigation algorithm combines vision, LiDAR and IMU data to achieve centimeter-level precise positioning and stable hovering. The drone can complete autonomous flight and intelligent obstacle avoidance in complex bridge environments without relying on GPS.
≤2cm
Hover Accuracy
✓
GPS-Free Flight
✓
Autonomous Obstacle Avoidance
Core Technology
02 AI Defect Detection
AI Automatically Identifies Bridge Defects
Based on deep-learning defect detection models, the system automatically identifies multiple typical defects including cracks, corrosion, spalling and honeycomb, while automatically completing location marking, dimension quantification and severity analysis. Compared with traditional manual review, it greatly reduces miss rates and manual workload.
200K+
Training Samples
≥95%
Detection Accuracy
0.1mm
Crack Detection
Intelligent Analysis
03 Digital Twin Modeling
Build Digital Asset Models of Bridges
Combining laser point clouds and high-definition image data, quickly generate high-precision 3D digital twin models of bridges, achieving precise mapping between defect locations and bridge structures. Managers can directly view defect distribution, historical changes and maintenance records in the 3D model.
2cm
Modeling Accuracy
✓
3D Positioning
✓
Full Lifecycle
Digital Twin
04 Full-Process Automated Inspection
From Flight to Report, Fully Automated
The system covers the entire process of route planning, autonomous flight, data collection, AI analysis, 3D modeling and report output, without requiring manual real-time control or defect review. Truly achieving standardized and digitalized bridge inspection.
8-10x
Efficiency Gain
1-2 Days
Inspection Cycle
✓
Unified Management
Automated Process
Standardized Bridge Inspection Workflow
Focused on transportation infrastructure engineering scenarios, Riejian has built a complete standardized inspection system to ensure complex bridge projects are replicable, implementable and acceptable.
Field Data Collection
01Fully Automatic Drone Route Flight
Drones fly autonomously along preset reusable routes, completing full-bridge HD image collection. A 500-meter-level bridge can yield nearly 100GB of complete data.
Digital Twin Modeling
02Multi-Source Data 3D Reconstruction
Supports oblique photography, LiDAR and BIM model import, completing multi-source 3D reconstruction to form a standardized digital twin foundation.
AI Analysis & Management
03Intelligent Defect Identification & Mapping
AI screening of defects from 200K+ samples, precise mapping onto the 3D model, plus multi-period data aggregation and historical comparison.
Closed-Loop Delivery
04Compliant Reports & Asset Archives
Rule-based compliant inspection report output, platform data aggregation and historical comparison, supporting automated compliance rating and maintenance decisions.
Typical Application Scenarios
Suitable for safety inspection and health monitoring of various bridge structures
Emergency Response
Periodic Inspection of a Large Cross-Sea Bridge
Provided quarterly inspection services for a large cross-sea bridge, achieving full-structure coverage and building a bridge health archive.
Project Acceptance
Handover Acceptance Inspection of a Newly Built Bridge
Provided handover acceptance inspection for a new urban landmark bridge, with results meeting the JTG 5120-2021 standard.
Deliverables List
Seven standardized deliverables ensure complete and traceable inspection work
Bridge Inspection Report
Standardized inspection report compliant with JTG 5120-2021, including detailed defect descriptions and recommendations
Defect List
Detailed defect list including location, type, dimension and severity information
Health Assessment Report
Bridge structural health assessment including technical condition rating
Maintenance Recommendation
Targeted repair and strengthening recommendations with engineering quantity estimates
HD Image Archive
Original HD image materials including defect close-ups and panoramic photos
3D Model
Real-scene 3D model of the bridge supporting 3D visualization and interactive browsing
Database Archive
Electronic archive of inspection data, supporting integration with bridge management systems
Solution Value & Customer Benefits
Creating value for customers across four dimensions: safety, efficiency, cost and management
0
Safety Assurance
Eliminates manual high-altitude work risks and ensures inspector safety
0
Efficiency Gain
Greatly improves inspection efficiency, shortens cycles and reduces traffic impact
0
Cost Savings
Lowers inspection costs, reduces equipment investment and optimizes human resource allocation
0
Management Improvement
Standardized data management supporting long-term monitoring and trend analysis
Experience It Now
Book a free demo and experience the powerful capabilities of Riejian's drone bridge inspection solution
Free Demo
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Custom Quote / Technical Consultation
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White Paper Download
Download the "Drone Bridge Inspection Technical White Paper" to learn about industry-leading technology and best practices.