| 摘要 |
PURPOSE:To raise the strength of concrete piles by a method in which spiral reinforcing bars are wound around deformed reinforcing bars to form a specific reinforcing bar cage, PC steel bars are set inside the spiral reinforcing bars, and are buried in a concrete pile, and a specific prestress is introduced into the pile. CONSTITUTION:As axial reinforcing bars of a concrete pile having a compressive strength of 800kg/cm<2> or more, deformed reinforcing bars 4 are set in the circumferential direction of concrete pile, and spiral reinforcing bars are wound around the bars 4 in such a way that a bar arrangement ratio on the basis of cross sectional area of the pile is 0.4% or more to form a reinforcing bar cage. Plural PC steel bars 1 extending to the axial direction of the pile are arranged in the circumferential direction of the pile in the inside of the bars 4 and buried. An effective prestress of 35kg/cm<2> to 60kg/cm<2> is introduced by the steel bars 1 into the pile. The ratio of the axial steel materials including the bars 4 and the bars 1 to the cross sectional area of the pile is controlled to 2-5%. |
