Construction method of monopile foundation for offshore wind power generation and monopile foundation for offshore wind power generation

摘要

PROBLEM TO BE SOLVED: To construct a monopile foundation for offshore wind power generation and a monopile for offshore wind power generation capable of constructing a monopile foundation on a place where rock or hard ground is exposed and a submerged ground having a sedimentary layer on the rock or hard ground with high position accuracy. Provide the foundation. SOLUTION: An elevating work gantry 16 is installed at a planned construction position of a monopile pile. Next, the casing pipe 29 is attached to the all-around rotary excavator 23 installed on the work platform 16, and the guide hole reaching a predetermined depth of the bedrock layer 3 is pre-drilled, and then the diameter-expanding excavator 33 is formed in the casing pipe 29. Is attached, the guide hole is expanded in diameter, and the pile hole 35 is excavated. Then, the monopile pile is passed through the insertion guide installed on the work gantry 16 and built into the pile hole 35. After that, underwater concrete is filled between the pile hole 35 and the monopile pile to complete the monopile foundation. [Selection diagram] Fig. 7