Recently, the steel truss girder integrated transportation and installation project for the Shanghai Hutong Railway Phase II High Bridge, contracted by Jiangsu Yongjie Special Equipment and executed by China Communications Construction Second Harbor Engineering Company Limited, has been successfully completed. This achievement sets two new national records: the largest span of a three-line curved chord under-supported simply supported steel truss girder in China, and the largest tonnage bridge in the SPMT integrated transportation category. The project has established an innovative benchmark for large-span steel truss girder transportation in urban complex environments.
Go fighting
This "span record" steel truss girder employs a dual-main-truss structure, measuring 154.8 meters in length and 21.28 meters in width, with 4,996 tons of steel used and a total weight of approximately 5,600 tons. As a key control project along the entire route, the bridge spans the heavily trafficked intersection of Yanggao North Road and Gangcheng Road, handling an average daily traffic volume of 53,600 vehicles. The structure is densely packed with 176 underground pipelines, with the closest point to the airport oil pipeline being merely 6 meters away. Transporting the steel girder is akin to "dancing on the edge of a blade."
Breakthrough technology
The complex construction environment, heavy traffic interference, and stringent safety requirements make this relocation operation exceptionally challenging among similar domestic projects. Yongjie Equipment has established a specialized technical team to implement an innovative "SPMT Transport System + Support System" methodology, featuring: 1) off-site bracket assembly, 2) SPMT-powered intelligent whole-unit relocation, and 3) precision beam placement adjustments.
1. Exclusive Intelligent Monitoring System: Featuring our proprietary smart monitoring system that integrates GPS, BeiDou, and GNSS receivers, it achieves millimeter-level tracking of girder movement trajectories and real-time transmission of critical data, establishing a comprehensive digital twin security framework.
2. Multi-vehicle Group High-Precision Synchronized Control: Leveraging advanced synchronized control technology, our company's upgraded 200+-axis SPMT module vehicles operate in coordinated mode under unified system command, achieving multiple rotations, longitudinal and oblique movements with precision in complex environments.
3. Efficient transportation of beams by an integrated system: Through the innovative design of "vehicle + support", a stable and reliable transportation system is built. It only takes 6 hours to smoothly cross the busy intersection with an average daily traffic flow of more than 50,000 vehicles from the assembly area, minimizing the impact on urban traffic.
Smart Innovation Benchmark
The innovative "High-Synchronization SPMT Transport System + Support System" integrated relocation method, independently developed by Yongjie Equipment, represents China's first-of-its-kind solution. Through breakthroughs in key technologies—including coordinated control of over 200-axis SPMT module trucks, precision monitoring of 176 pipelines, and 6-hour extreme road closure—the system slashes construction time by 90% compared to traditional methods while achieving millimeter-level precision in girder placement, setting new benchmarks for speed and accuracy in steel truss girder transportation.
Yongjie Equipment, driven by its mission to "Simplify Transportation," has leveraged technological innovation to address the industry's persistent challenge of "beam installation difficulties in congested areas" from R&D to engineering implementation. The successful installation of steel truss beams not only laid a solid foundation for the Shanghai-Tongzhou Railway's operation but also established a benchmark solution for intelligent equipment-driven transportation in China's high-speed rail construction. This steel marvel stands as a testament to the innovative power of infrastructure development in the new era.
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