In spring 1938 several cracks appeared in the reinforced concrete viaduct. This deformation was caused by creeping movement in the left side of the valley where one of the two abutments and approach viaducts are situated. After three years' study of the creep process (1939-51) a proposed structure for safeguarding the bridge was developed. The principal part of the reconstruction is a horizontal shore (stiffening beam) between the two ...