The two Danish firms will build a coast-to-coast link that connects the cities of Shenzhen and Zhongshan.
Plans for the 24-kilometre bridge include what will be the world’s widest immersed tunnel, two artificial islands and two suspension bridges.
The two firms have previously teamed up on the Great Belt Fixed Link (Storbæltsbroen) between Funen and Zealand and were heavily involved in the Øresund Bridge connecting Copenhagen and Malmö.
“One of our primary advantages as a team is that we have vast experience both with large suspension bridges, immersed tunnels and marine engineering,” COWI regional vice president Lars Hauge said in a press release.
“Winning this major international competition underlines Denmark’s world leading position when it comes to designing major bridges,” Hauge added, vowing that the ShenZhong link would be “both visionary and structurally daring”.
Guangdong is one of China’s wealthiest provinces and the new coast-to-coast link will be a party of a major infrastructure upgrade to support the area’s economic growth.
According to Berlingske Business, the ShenZhong link project has a price tag of 36 billion kroner ($5.5 billion).