Reusing existing piles has several advantages, including reducing the environmental load, when reconstructing old buildings. This report describes a reuse of bored piles constructed almost 25 years ago as the foundation of a new 9-story R/C building. The following conclusions were reached.
(1) The results of integrity and durability tests show no damage or deterioration of the old piles.
(2) The results of a settlement analysis based on the hybrid method show that a foundation of old and new piles is unlikely to undergo dangerous settlement.
(3) The seismic safety of the foundation is ensured by the application of a flexible connection at a pile head.
