A 3D-printed concrete bridge at 1:2 scale of the Zhaozhou Bridge-the oldest standing bridge in China -is seen at Beichen campus of Hebei University of Technology in Tianjin on Oct 21, 2019. The pedestrian bridge is a replica of Zhaozhou Bridge in Zhaoxian county in neighboring Hebei province, the oldest standing bridge in China. Built in the Sui Dynasty (581-618), it is also the world's oldest single-arch bridge, with a span of 37 meters according to Xinhua News Agency.(Photo: China News Serivce/Li Shengli)
A 3D-printed concrete bridge at 1:2 scale of the Zhaozhou Bridge-the oldest standing bridge in China -is seen at Beichen campus of Hebei University of Technology in Tianjin on Oct 21, 2019. The pedestrian bridge is a replica of Zhaozhou Bridge in Zhaoxian county in neighboring Hebei province, the oldest standing bridge in China. Built in the Sui Dynasty (581-618), it is also the world's oldest single-arch bridge, with a span of 37 meters according to Xinhua News Agency.(Photo: China News Serivce/Li Shengli)
A 3D-printed concrete bridge at 1:2 scale of the Zhaozhou Bridge-the oldest standing bridge in China -is seen at Beichen campus of Hebei University of Technology in Tianjin on Oct 21, 2019. The pedestrian bridge is a replica of Zhaozhou Bridge in Zhaoxian county in neighboring Hebei province, the oldest standing bridge in China. Built in the Sui Dynasty (581-618), it is also the world's oldest single-arch bridge, with a span of 37 meters according to Xinhua News Agency.(Photo: China News Serivce/Li Shengli)
