World's largest steel cassion of "three-in-one" bridge finishes its undocking

NANJING, Dec. 30(Xinhua) --Here is the world's largest steel cassion in east China's Jiangsu!

The caisson of Changzhou-Taizhou Yangtze River Bridge is a watertight retaining structure used to work on the foundations of a bridge pier. The 72-meter high caissons of the two main piers cover an area of 13 basketball courts.

Changzhou-Taizhou Yangtze River Bridge is the first bridge that integrates an expressway, an ordinary highway and an inter-city railway on the Yangtze River, the world's third longest river.

With a main span of 1,176 meters, the bridge is set to have the largest span for a cable-stayed bridge in the world.

Video by Tang Dehong