Altamount Sidehill Viaduct, Northern California, USA

Thirteen pier cap beams of this 440 m long bridge were retrofitted with twin-tie rod groups connecting each side of the steel cap beam end to a new anchoring block. Tie rods, consisting of Ø36 mm DYWIDAG Bars (THREADBAR^®) placed inside of galvanized steel pipes, run inclined from the anchoring block to a special steel "shoe" bracket fixed end. After a small post-tensioning force was applied at the anchorages, the tie rods were cement grouted.