During the Sui dynasty, it took a decade for master craftsman Li Chun to build the Anji stone bridge in southern Hebei province. Some 1,400 years later, Tsinghua University robotics professor Xu Weiguo copied the structure in just 19 days, with the assistance of robots 3D printing in concrete. The resulting engineering marvel — an 86-feet-long, 12-feet-wide bridge in the Boashan district of Shanghai — uses a single load-bearing arch, just like Anji.
Robotic arms swung back and forth for some 450 hours, fulfilling the demands of their algorithms. The robots were programmed to follow separate models of the arch structure, fence, and deck, yielding some 176 uniquely-shaped pieces, which were then slotted into place.
The hyper-real, curvilinear, machine asthetic of many 3D modeled objects is also found in this bridge. On the deck, a brain coral pattern filled with fine stones add some warmth, bringing the feel of traditional Chinese garden path.
According to Tsinghua University, the 3D printed bridge costs just two-thirds the price of a bridge produced the conventional way.
Professor Xu and his team at the Tsinghua University School of Architecture’s Zoina Land Joint Research Center for Digital Architecture (JCDA) tested the bridge design using a 1:4 scale model to ensure it would bear the weight of pedestrians. And for extra safety, they built in a real-time monitoring system. Wires and sensors embedded throughout the structure send a constant stream of data on the performance of the bridge.
ArchDaily notes the world’s first 3D printed steel bridge just debuted in The Netherlands, and Columbia Unversity has been experimenting with 3D printing timber lookalikes. Like other sectors, construction may soon become more automated.