METHOD FOR MANUFACTURING CONCRETE PILE COVERED WITH STEEL PIPE, AND CONCRETE PILE COVERED WITH STEEL PIPE

摘要

PROBLEM TO BE SOLVED: To eliminate crack initiation at an inside cylindrical concrete part 21 by enhancing the flexural strength of a concrete pile covered with a steel pipe, thereby reducing elongation occurring to the outer surface 27 of the inside cylindrical concrete part 25 formed of a usual material even when elongation occurs on the inner surface 7 side of the steel pipe 6. SOLUTION: The concrete pile 30 covered with the steel pipe is constituted by forming a cylindrical concrete part 11 on the inner surface 7 side of the steel pipe 6 to which end plates 1, 1 are fixed. The cylindrical concrete part 11 is composed of two layers which are an outside cylindrical concrete part 21 enhanced in tensile strength, and the inside cylindrical concrete part 25 using concrete conventionally used for a usual concrete pile 30 covered with the steel pipe. The steel pipe 6 is formed using material enhanced in tensile strength (or a yield point) compared to a conventional one, or its thickness t1is set thicker. The flexural strength of the concrete pile 30 covered with the steel pipe is thereby enhanced. COPYRIGHT: (C)2011,JPO&INPIT