Hangzhou Bay Bridge , the longest trans-oceanic bridge in the world , is a link connecting the chinese municipalities of Jiaxing and Ningbo in Zhejiang , China . The long highway bridge has 35.673 km (22 mi) .
The Bridge is an S-shaped stayed-cable bridge with six lanes in both directions and it’s expected to have a 100-year lifespan. Had a price tag of 11.8 billion yuan (US$1.70 billion).
The first preparations for planning the bridge started 10 years before starting the contruction with 600 experts spending nine years on designing the Hangzhou Bay Bridge. Chief Commander of the Hangzhou Bay Bridge project is Mr Wang Yong.
Construction of the bridge was completed on June 14, 2007,and an opening ceremony was held on June 26, 2007 to great domestic media fanfare. But the bridge was not opened to public use until May 1, 2008 after a considerable period of testing and evaluation. The bridge shortened the highway travel distance between Ningbo and Shanghai from 400 km (249 mi) to 280 km (174 mi) and reduced travel time from 4 to 2.5 hours.
- First major challenge was offshore construction. As a solution, several parts of the bridge had to be completed on land.
- According to Wang Yong, chief director of the Hangzhou Bay Trans-Oceanic Bridge Construction Command Post, described the bridge as being built “in the world’s most complicated sea environment, with one of the three biggest tides on Earth, the effect of typhoons and the difficult content of the sea soil.”
- Area of toxic methane gas that was discovered 50 meters underground below the location of the bridge. No drilling could be completed before the gas pressure was alleviated. For this purpose , steel pipes were inserted into the ground , to release the methane .