A Method of Section Replacement for Pile-Bent Pier Rehabilitation

This paper presents a case of repair practice for a concrete bridge that was classified as imminent failure condition. The bridge is slab-type with an equal span of 10 meters long. Each pier is built up of six driven concrete piles. Over 30 years, critical deterioration occurred to concrete pier columns with many severe corrosion spots on reinforcing bars. A concept of section replacement was used to develop a repair technique to remove an entire body of deteriorated materials and restore with selected new materials, was used to develop a repair method. The method involved several stages of works that included: site investigation, damage inspections; work area preparation and installation of temporary structure; material replacement; and work completion. The lesson learned from repair practice suggests the number of key success factors to complete the task safely and cost effectively in a timely way.