The authors have proposed the additional reinforcing structure which uses steel sheet piles with wedge shape heads for existing caisson type quay walls (Kondoh et al., 1998). An idea of the design is to utilize effect of the geometry brought by shape of the wedge. These reinforcing structures compact its surrounding ground due to placing the shape of the wedge. The effectivensess of this additional reinforcing structure was verified by the dynamic analysis through the site investigation after construction and the verification analysis, it is confirmed that the new seismic retrofit design is epoch-making to reduce their damage after the earthquake. This paper mainly presents the mechanism of seismic retrofit design and the results of the site investigation in field.
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