| 摘要 |
PROBLEM TO BE SOLVED: To increase the yield strength against a horizontal load and build a safe foundation by connecting a pile main body to a joint portion of a foundation pile with a tilt of a particular angle toward a center of axis direction between them and arranging a plurality of non- tensioned bars in parallel to and at the outer side of tensioned PC steel rods in the pile main body embedded in the foundation pile. SOLUTION: In a concrete pile 10 comprising a cylindrical pile main body 11 and a joint portion 12 formed with a diameter smaller than that of the pile main body portion 11 which continued to the lower end portion of the main body 11, a joint portion between the main body portion 11 and the joint portion 12 is connected with a tilt surface 13 having an angle of tilt of 30 to 45 degrees to the center of axis direction. Tensioning PC steel rods 14 with both the ends respectively linked in a tension state to both the upper and lower end plates 15A, 15B over the total length of the foundation pile 11 are embedded, and a plurality of non-tension bars 17 comprising deformed bars and PC steel members are arranged in parallel at the outer side of tensioned PC steel rods 14 inside the pile main body 11. By arranging non-tension bars 17 at the outer side of the tensioned PC steel rods 14, a great bending yield strength can be created thereby permitting the construction of safe foundation. Thus, the foundation piles 11 create the optimum result when they are installed near the ground surface where a great bending moment occurs.
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