Tool for offshore wind power foundation pile and method for using same

A method for using the tool for an offshore wind power foundation pile, wherein the offshore wind power foundation comprises a foundation module (100) and a pile sinking module (200), wherein the foundation module (100) comprises a steel pipe pile (110) and a pile shoe (130), and the pile sinking module (200) comprises a pile core (220) and a pile cap (210);

• wherein a cutting shoe portion (120) is arranged at a bottom of the steel pipe pile (110), and an outer diameter of the pile shoe (130) is larger than an outer diameter of the cutting shoe portion (120);
• wherein the pile cap (210) is detachably connected to a top of the steel pipe pile (110);
• wherein the pile core (220) is located within the steel pipe pile (110), the pile core (220) is detachably connected to the pile shoe (130), and a length of the pile core (220) is larger than or equal to a length of the steel pipe pile (110);
• wherein the pile cap (210) is further provided with a pile core limiting portion (214) and a pile core accommodating groove (213) within the pile cap (210) extending in an axial direction;
• wherein the pile core limiting portion (214) comprises a pile core limiting block (2141) and a limiting hole (2142), and the limiting hole (2142) communicates with the pile core accommodating groove (213) and an inner cavity of the steel pipe pile (110);
• wherein the pile core limiting block (2141) is configured to open and close the limiting hole (2142), and the pile core limiting block (2141) is configured to be arranged in three positions:
• upon the pile core limiting block (2141) being located in a first position, the limiting hole (2142) is fully opened, and the pile core (220) is available to freely pass through the pile core accommodating groove (213) and the inner cavity of the steel pipe pile (110);
• upon the pile core limiting block (2141) being located in a second position, the limiting hole (2142) is semi-closed, the pile core (220) is clamped in the limiting hole (2142), and part of the pile core (220) is located in the pile core accommodating groove (213);
• and upon the pile core limiting block (2141) being located in a third position, the limiting hole (2142) is fully closed, and the pile core (220) is located below the pile core limiting block (2141);
• wherein the method comprises:
• 1) connecting the pile core (220) to the pile shoe (130), and arranging the pile core limiting block (2141) in the first position, so that part of the pile core (220) is located in the pile core accommodating groove (213);
• arranging the pile core limiting block (2141) in the second position, so that the pile core (220) is fixed to the pile cap (210);
• 2) hoisting the tool to a position of the pile shoe (130) making contact with a top surface of a seabed;
• arranging the pile core limiting block (2141) in the first position, lifting the pile cap (210) till the top of the pile core (220) moves to a position below the pile core limiting block (2141), and arranging the pile core limiting block (2141) in the third position;
• 3) hammering the top of the pile cap (210), so that the foundation module (100) sinks to a preset position;
• 4) arranging the pile core limiting block (2141) in the first position, disconnecting the pile core (220) from the pile shoe (130), and hammering the top of the pile cap (210), so that the steel pipe pile (110) sinks, and the cutting shoes (121) of the bottom cutting shoe portion (120) are expanded outwards in a radial direction of the pile shoe (130);
• and
• 5) uplifting the pile cap (210) and the pile core (220), and pouring concrete (300) into the steel pipe pile (110), so that a gap between the steel pipe pile (110) and the pile shoe (130) is closed.