VIENNA — Researchers have demonstrated a futuristic bridge-building technique that allows the structure to unfold like an umbrella to the length of its span. <br /><br />This new technique is cost-effective, time-saving and has less impact on the natural landscape, according to a news release from Vienna University of Technology.<br /><br />The Lafnitz Bridge in Austria was built vertically instead of horizontally with scaffolding, like traditional bridges.<br /><br />Using this technique, engineers erected two vertical concrete piers and attached steel girders on both sides. As the piers are then slowly lowered using hydraulic systems, the steel girders unfold.<br /><br />Once the bridge has opened up to reach a horizontal position, concrete is added to the structure.<br /><br />The 116-meter Lafnitz Bridge was "unfolded" over the Lafnitz River on February 27, 2020.<br /><br />Johann Kollegger, a professor at the Vienna University of Technology, explained in the news release that traditional bridges erected using scaffolding can take months to be completed.<br /><br />Using this new technique, the elements for the lowering method can be set up in two to three days while the lowering process itself takes roughly three hours.<br /><br />Kollegger noted that the technique could be used to build bridges in difficult terrain or "terrain that should be not disturbed," such as nature reserves.
