Inside the $170M Tian’e Longtan Bridge: How China Built the World’s Longest-Span Concrete Arch

A 600-meter concrete arch rises between two steep mountains above China’s deep Longtan Reservoir. From bare rock and temporary cable systems to arch closure, roadway construction, and final testing, discover the complete building process step by step. #EngineeringDocumentary #BridgeConstruction #MegaProjects #TianeLongtanBridge Have you ever wondered how engineers could build a record-breaking concrete arch across a vast reservoir without supporting it from below? Located in Tian’e County, Guangxi, the Tian’e Longtan Bridge carries the Nandan–Tian’e Expressway across the Hongshui River and Longtan Reservoir. With a total length of 2,488.55 meters and a 600-meter main span, it holds the record for the world’s longest-span steel-reinforced concrete arch bridge. From surveying the mountainous site and preparing the foundations to assembling the steel-tube skeleton, pumping concrete, erecting the roadway structure, and completing load tests, this documentary follows the full construction journey. What you will see in this video: ✅ How engineers surveyed the reservoir and steep mountain slopes ✅ How access roads, work platforms, foundations, and arch springings were prepared ✅ How cable cranes transported massive components above deep water ✅ How the temporary stay-buckle system supported the growing arch halves ✅ How steel-tube segments were lifted and connected toward the center ✅ How concrete was pumped into and placed around the structural skeleton ✅ How spandrel columns and T-girders formed the elevated roadway ✅ How barriers, drainage, pavement, and safety systems completed the crossing ✅ How inspections and load testing prepared the bridge for operation The challenge extended far beyond the bridge’s size. Engineers had to manage deep water, high and steep mountains, heavy structural weight, difficult site access, precise arch alignment, temporary cable forces, concrete quality, and the safe lifting of enormous components hundreds of meters from the nearest stable ground. Watch the landscape transform from an open reservoir between two mountains into a continuous expressway crossing—and stay until the final reveal to see the completed arch at its full scale. If you enjoy real engineering, bridge construction, heavy machinery, and full-process infrastructure documentaries, subscribe to Engineering Revealed. AI & Production Disclosure: This video uses digital visualization and AI-assisted imagery for educational documentary storytelling. Research, structure, writing, editing, and production direction are created by Engineering Revealed. Educational Note: This content is created for educational and documentary purposes. It is not professional engineering advice or an official construction record. #EngineeringDocumentary #BridgeConstruction #CivilEngineering #ChinaEngineering #HeavyMachinery #MegaProjects