4 Long-Span Bridges – Hurongxi Expressway

The project provides tilt and vibration monitoring together with rapid UAV inspection for four major bridges on the Hurongxi Expressway: Longtanhe, Zhijinghe, Siduhe and Tieluoping. The Siduhe Bridge is 1,365 m long with a 900 m main span, 118.2 m tower, and a 650 m height difference from tower top to the valley floor - the world's longest suspension bridge built across a deep mountain gorge and once regarded as the world's highest suspension bridge. The Longtanhe Bridge spans 1,182 m with a maximum pier height of 178 m, the tallest pier bridge in the world.