The construction technology of the underwater steel cylinder protection structure is the key to the underwater ocean development and the submarine petrochemical exploitation in the Bohai Sea navigable area.At a depth of 22 m in the navigable area,the underwater protection structure sinking of a large steel cylinder with a diameter of 24 m and a height of 14.5 m is taken as the research object.Through the analysis of the most unfavorable geological environment,the sinking characteristics under different operating environment were compared,the feasibility of underwater vibration sinking of steel cylinder with a linkage hammer system was analyzed through the finite element modeling analysis,and the key process control content of vibration sinking was analyzed reasonably.This study was effectively applied in the first underwater steel cylinder vibration sinking project in Bohai Bay,and finally completed the sinking accuracy of steel cylinder was 50％higher than the designed steel cylinder,which effectively proves the effectiveness and reliability of the underwater vibration sinking steel cylinder technology,and summarizes the new theory of the underwater vibration sinking construction technology of large steel cylinder.
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