Hernani Viaduct over the Urumea River. A cable stayed bridge for the high speed railway

摘要

Hernani Viaduct is a 1226 long viaduct with two cable stayed spans of 120 m and 67.7 m. It willbecome the first cable stayed bridge for HSR (High Speed Railway) in Spain. Construction startedin 2013 and will be finished by the end of 2015.Hernani Viaduct is part of the access railway line to San Sebastian in the North of Spain. This 1226m long viaduct runs parallel to the Urumea River, crossing it three times with increasing spans (39,67.7 and 120 m) due to skew angle. Structure depth is limited by 500 year return period flood waterlevel to 1.10 m below railway platform. This depth restriction forces us to adopt singular U shapeddeck section and to add cable stayed superstructure for the 67.7 and 120 m spans. Construction iscarried out using falsework. Temporary piers are placed every 30 m in the main spans and removedafter cable stayed tensioning.