| 摘要 |
PROBLEM TO BE SOLVED: To provide a calculation method for pull-out resistance of a pile that clarifies the pull-out resistance at each of widened-diameter parts and enables accurate calculation of the pull-out resistance even when soil quality changes in a middle of the widened-diameter part.SOLUTION: A calculation method is for calculating pull-out resistance of an under-reamed pile 1 having a widened-diameter part 3 widened diagonally downward from a shaft part 2. Specifically, in the method that calculates the pull-out resistance by calculating a side surface area of the shaft part and the widened-diameter part in contact with a ground, multiplying the side surface area by a coefficient of frictional resistance specific to strength of soil in the surrounding and frictional resistance in relation with the soil, and calculating the pull-out resistance based on an integrated value of the calculation results for the shaft part and the widened-diameter part and effective self-weight of the under-reamed pile, the side surface area is calculated at least for each type of soil, and different values of the coefficient of frictional resistance are used for different angles of inclination and types of soil, in a portion with an inclined surface.SELECTED DRAWING: Figure 1 |
