First prestressed composite railway bridge in Japan with steel pipe truss webs

Yamaguragawa Bridge, Japan

The new Yamaguragawa Bridge over the Orii River, part of the Uetsu Rail Line between Kamiyama and Tsukioka, Niigata Prefecture, is a post-tensioned concrete trough bridge characterised by girders with steel pipe truss webs. It is the first composite railway bridge that combines the benefits of steel and concrete to achieve higher structural efficiency.
The bridge is a 51.8 m long, 6.75 m wide single-span structure. Since the bridge is located in a snowy area, the bottom slabs were designed as a grid structure, to facilitate snow removal.
The bottom slabs are post-tensioned in the longitudinal direction using DYWIDAG Tendons type MA 12 x 0.6".