既設杭基礎の地盤改良併設による耐震補強技術

抄録

Reinforcement of superstructures and substructures is being carried out for existing bridges which are judged to have low earthquake resistance. However, reinforcement techniques are not systematized because the seismic diagnosis method and required performance are not clarified for existing pile foundations. One of the reason is that no reasonable reinforcement technology under construction constraints are established. Therefore, reinforcement technology, that ensures seismic performance by improving ground around the pile, is examined for the existing pile foundation in the soft ground against large-scale earthquakes. In this paper, its seismic reinforcement effect for the existing pile foundation in extreme soft ground and liquefiable ground is shown based on representative experimental results.