English：

When building long-span bridges across waterways, the construction of cofferdams for the maintower foundations is greatly influenced by factors, such as soil conditions, excavation depth, andexcavation area, making the construction quite challenging. Especiallywhen the foundation excavations ofthe main towers are deep and large, the cofferdams are prone to poor stability and high risks of uplift. Toaddress this issue, in the project of Cao’e River Bridge, a construction control technology for the maintower foundation cofferdam based on BIM was proposed, construction plan is optimized, and therationality of the optimized plan was verified, through finite element model calculations. The cofferdamconstruction earlywarning system was used to find potential errors during the construction process,breaking the information silos, allowing for timely corrections and optimizations of the target structure andits construction process. When the displacement or stress at the monitoring points reaches the warningvalue, the system will alert the management personnel to activate the safety emergency plan, significantlyenhancing the safety of construction,work efficiency, and achieving good economic benefits.