Construction method of unbonded prestressed cast-in-situ bored pile

The invention discloses a construction method of an unbonded prestressed cast-in-situ bored pile. The construction method comprises the following steps: drilling in a preset area to form a pile hole; preparing a reinforcement cage; the reinforcement cage is lifted to the position above the pile hole, the perpendicularity of the reinforcement cage is adjusted, and the reinforcement cage is placed into the pile hole; pile body concrete is poured into the pile hole; after the concrete of the pile body is solidified, the side face of the pile body is grouted through the pile side grouting assembly; and when pile body concrete and pile side grouting are solidified and reach the design strength, the multiple steel strands in one outer sleeve are tensioned, and the pre-locking value of the steel strands reaches 192KN. And through the arrangement of the prestressed steel hinge assembly, the pile foundation strength can be effectively improved, pile foundation concrete cracks are avoided, and the durability is improve