The pretension force of piles under working load can be deduced from the combination of the tension force induced by excavation and the tension force induced by working load.

• 正常使用状态下桩身轴力是土体回弹隆起引起的轴力和桩顶上拔的引起的轴力的叠加，应以此对桩身的钢筋配置进行校核。