After more than 380 days of construction, on June 16th, the two main towers of the Xiangshan Harbor Cross - sea Bridge on the urban rail transit line were both capped. 

The bridge 8.26-kilometer-long serves as a controlling project for the Xiangshan Line of the urban rail transit. Both of the two main towers that reached their tops this time are 225.5 meters high, comparable to a 75 - story skyscraper. To make sure this large - scale offshore “diamond” remains stable and upright, during construction, not only the design techniques were factored in, but also smart measures were added to enable millimeter - level precise elevation.

“We use a visual dynamic monitoring system. With more than 500 sensors conducting round - the - clock diagnosis, it's like wearing a fluoroscope. Every subtle change during the bridge construction process can be precisely monitored,”Xu Xiaokai, the owner's representative of the urban rail transit company, told reporters.During the construction process, in the face of challenges such as complex offshore geological conditions and strong high - altitude winds, the project team rose to the occasion. Through technological innovation and meticulous management, they achieved breakthroughs. They solved a total of 23 technical problems, developed 2 scientific research construction methods, increased the efficiency of traditional main tower operations by more than 10%, and completed the tower capping 15 days ahead of schedule.

Chen Zhengdong, the project manager of the SGXS05 section of China Railway Bridge Bureau, introduced on - site, "We used BIM technology to simulate the entire capping process. Through the intelligent dispatching system for precise control, we monitored key indicators such as the stress, displacement, and deformation of the main tower in real - time to ensure the one - time success of the capping construction."

The successful capping of the two main towers has accelerated the construction progress of the entire line. Currently, the main structures of all the stations along the entire line have been capped. All the shield - tunneling sections and 17 mountain tunnels have been completed. Approximately 88% of the elevated bridges have been completed.