FILLING CONCRETE LEAKAGE PREVENTION STRUCTURE

PROBLEM TO BE SOLVED: To surely prevent concrete filled in a clearance of a connection part between a steel pipe pile and a steel pipe column from leaking while performing connection work of a steel pipe pile foundation and the steel pipe column of a jacket as a marine structure in a short period of time.SOLUTION: The head of a steel pipe pile 20 precedently driven in the seabed ground is covered with a steel pile column 11 with a prescribed overlap allowance, and when concrete is filled in a clearance 6 between the steel pipe pile 20 and the steel pile column 11 to connect the two materials with each other, a concrete leakage prevention part 30 is provided in a connection part 5. The leakage prevention part 30 comprises: a seal bearing member 12 provided on the outer peripheral surface of the steel pipe pile 20; and a ring-shaped elastic seal plate 13 provided above the seal bearing member 12 such that the outer edge of the ring-shaped elastic seal plate 13 is borne on the inner peripheral surface of the steel pile column 11. When the elastic seal plate 13 prevents the concrete 15 from leaking by bringing a part of the inner edge side of the elastic seal plate 13 into close contact with the steel pipe pile 20 penetrating through a central opening, the seal bearing member 12 keeps an elastic deformation state of the elastic seal plate 13 generated during placement of the concrete and suppresses the progress of subsequent deformation.