Les ingénieurs ont fait pivoter le pont de 46 000 tonnes dans les airs à 52,4 degrés en seulement 68 minutes et sans interrompre les trains qui passaient sous

Engineers in northern China have rotated a bridge weighing 46,000 tonnes through the air by precisely 52.4 degrees in just 68 minutes, achieving this feat without disrupting train traffic passing beneath it. The maneuver took place over the Beijing-Guangzhou railway line in Baoding, Hebei province, and has set new world records for both the weight and span of a rotating structure. The bridge, spanning 263.6 meters, was constructed parallel to the active rail track and then rotated into its final position above the existing line. This method allowed continuous train operations below while the massive structure was moved into place. According to reports from CGTN and China Daily, the operation marked a breakthrough in engineering capabilities, demonstrating unprecedented precision and control over such a large-scale object. The rotation required meticulous planning and execution. The bridge's movement had to be exact, any deviation of even a few centimeters could compromise its alignment with the supporting pillars on either side of the tracks. Engineers used a central pivot point, a spherical bearing measuring 6.5 meters in diameter, which became another record holder in itself. This component supported the entire weight of the bridge during the rotation, allowing it to turn smoothly around the axis. The process began with the construction of the bridge alongside the railway, away from the main track. Once completed, the structure was carefully rotated using hydraulic systems and advanced monitoring technology. The entire sequence was executed in under an hour and 10 minutes, ensuring that trains continued their journey unimpeded throughout the operation. This technique, known as the rotational construction method, is increasingly being adopted in China for major infrastructure projects. It addresses logistical challenges posed by high-traffic routes and environmental constraints, reducing overall project timelines. By avoiding prolonged disruptions to critical transportation corridors, the approach aligns with China’s rapid development goals and the need for efficient infrastructure expansion. The achievement highlights advancements in civil engineering, particularly in the design and application of large-scale mechanical systems capable of handling immense weights with extreme accuracy. The spherical bearing used in this project represents a technological leap forward, setting a new benchmark for similar structures worldwide. The success of this project underscores the growing sophistication of Chinese engineering practices. As urbanization accelerates and demand for modern infrastructure rises, innovations like these will play a crucial role in shaping future developments. Engineers continue to refine techniques that balance scale, safety, and operational continuity, ensuring that progress does not come at the expense of essential services.