Abstract
Declining workers and technical skills to the next generation have been problems in the offshore construction sites. Until now, investigations of construction works have been done. However, there is more space to consider this matter. In this study, we focusing on instructions of an operation leader, and considered the correlations between the instructions, wave and weather conditions, and caisson behavior. During the installation of the caissons, based on the instructions, construction processes can divide into two stages; a moving stage, and a settlement stage. The caisson was easily affected by waves during the moving stage. Also, in the settlement stage, spectrum peak appeared in the high-frequency region. Moreover, from the interview with the operation leader, we realized the timing of the instructions and the meanings of each behavior.
