The total length of Hangzhou Bay Bridge is 36 kilometers, ranking first among the bridges under construction and built in the world.
Hangzhou Bay Bridge is located in a strongly corrosive marine environment. In order to ensure the service life of the bridge, the durability requirement of the design service life of 100 years is clearly put forward for the first time in China.
The largest diameter of steel pipe pile of Hangzhou Bay Sea-crossing Bridge is 1.6m, the largest length of single pile is 89m, and the largest weight is 74t, creating the largest steel pipe pile of large diameter and super-long integral spiral bridge at home and abroad.
The superstructure of Hangzhou Bay Cross-sea Bridge in deep water area adopts 70m prestressed concrete box girder integral prefabrication and maritime transportation technology. In order to solve the engineering problem of early cracking of large concrete box girder, the "secondary tensioning technology" was creatively put forward and implemented, which completely solved the "stubborn disease" of this project. Direct drinking water.
The 50-meter box girder of Hangzhou Bay Sea-crossing Bridge was erected on the girder, and the erection and transportation weight increased from 900 tons to 1.430 tons, setting a new record for similar technology and landform bridge construction in the world.
There is a large amount of shallow methane under the south bank of Hangzhou Bay Bridge 10 km tidal flat, which poses a serious threat to construction safety. In the construction of bored piles in tidal flat area, the safe construction technology of controllable deflation is creatively adopted, and its construction technology is the first in the world under similar geographical conditions.