| 摘要 |
PROBLEM TO BE SOLVED: To provide a pile-head joint structure for a steel pipe-reinforced concrete pile, which enables setting of an appropriate number of pile-head reinforcing steel bars, and can prevent occurrence of local out-of-plane bending yield of the steel-pipe pile preceding tensile yield of the pile-head reinforcing steel bars.SOLUTION: Pile-head reinforcing steel bars 5 and brackets 6 are provided. The pile-head reinforcing steel bars 5 are arranged at equal intervals along the outer circumference surface of a pile head 1a of a steel pipe-reinforced concrete pile, and buried in base concrete. The brackets 6 include pairs of plate-like supporting portions, where the pile-side joint end portions 6c of the plate-like supporting portions are joined to the outer circumference surface of the pile head by welding, and the steel bar-side joint end portions 6d are joined to the pile-head reinforcing steel bars by welding. The structure is designed to provide a satisfactory number of pile-head reinforcing steel bars by counting the rate of decrease in the out-of-plane bending yield strength of the pile head according to the outer diameter of the steel pipe-reinforced concrete pile and the bracket to a relationship between the tensile yield strength of the pile head and the tensile yield strength of all of the pile-head reinforcing steel bars.SELECTED DRAWING: Figure 2 |
