Aerial photo taken on Nov 18, 2016 shows pier concrete pouring at the construction site of Guanting Reservoir Bridge of Beijing-Zhangjiakou high-speed railway. The construction of main project of the bridge is scheduled to be finished in 2017. [Photo/Xinhua]

Aerial photo taken on Nov 18, 2016 shows pier concrete pouring at the construction site of Guanting Reservoir Bridge of Beijing-Zhangjiakou high-speed railway. The construction of main project of the bridge is scheduled to be finished in 2017. [Photo/Xinhua]

Pier concrete pouring operation is underway at the construction site of Guanting Reservoir Bridge of Beijing-Zhangjiakou high-speed railway on Nov 18, 2016. The construction of main project of the bridge is scheduled to be finished in 2017. [Photo/Xinhua]