Abstract
100 years has passed after Sea Fort No. 2 of Tokyo Bay was constructed in 1907 for military use. The fort suffered damage from Great Kanto Earthquake in 1923, there is a progression of deterioration, damage and collapse of the fort caused by winds and waves of many years. For the reason, measures to preserve the fort are being considered. In this study, we collected information of construction plan, construction techniques and design techniques on the first experience of large-scale sea fort construction in Japan. And, we also verified the information and compiled construction history of the fort. Then, we made discussion that the knowledge is used in present construction techniques.