The difficulty of constructing the bridge lies first in its foundation. Facing the soft soil overburden riverbed geology of the Yangtze River estuary and the semi-diurnal tidal marine environment, the construction team innovatively adopted intelligent pile-bottom and pile-side grouting technology for the first time in Chinese railway bridge construction, ensuring that each of the two main piers' 76 bored piles, each 2.5 meters in diameter, were deeply embedded in the riverbed rock layer.

The main pier steel cofferdam, a temporary retaining structure weighing approximately 2,650 tons—equivalent to the size of eight basketball courts and the height of a nine-story building—was successfully hoisted by the construction team using a dual-crane integrated lifting method, overcoming the effects of tidal range and reversing currents.

The two main towers of the bridge, each 153 meters high, adopt an H-shaped vase-type reinforced concrete structure and are constructed in 27 segments using an intelligent tower-building machine with climbing formwork. This intelligent tower-building machine integrates intelligent control of climbing and working status, intelligent concrete curing, and an AI smart construction site system, enabling millimeter-level monitoring of climbing accuracy, automatic concrete spraying and steam curing, as well as three-dimensional visualization monitoring of the construction process and real-time safety risk warnings, achieving digital control of the main tower construction.

To ensure that high-speed trains can cross the river smoothly and safely at a speed of 350 km/h, the bridge's railway deck is laid with ballastless track, imposing extremely high requirements on the linear accuracy of the deck. Jiang Yong, chief engineer of the Chongqi Yangtze River Highway-Railway Bridge project of China Railway Major Bridge Engineering Group, introduced that the construction team innovatively adopted a "bidirectional intelligent collaborative erection" scheme. The erection of steel beams for the main span and side spans was advanced simultaneously using two sets of intelligent construction methods, ultimately achieving a precise "handshake" of the steel beams high above the Yangtze River.

After the Chongqi Yangtze River Highway-Railway Bridge opens to traffic, the railway travel time from Shanghai to Qidong will be reduced from the current 2.5 hours to less than 30 minutes, which is of great significance for improving the comprehensive three-dimensional transportation corridor of the Yangtze River Economic Belt and serving the high-quality integrated development of the Yangtze River Delta.