Manufacturing method of double-layer reinforcement cage of cast-in-situ bored pile

The invention discloses a manufacturing method of a cast-in-situ bored pile double-layer reinforcement cage, and relates to the technical field of bridge construction.The manufacturing method of the cast-in-situ bored pile double-layer reinforcement cage specifically comprises the steps that a crescent-shaped reinforcement cage jig frame is machined based on design parameters of the double-layer reinforcement cage; a plurality of bored holes for positioning outer-layer main reinforcements are formed in the inner wall of the reinforcement cage jig frame; the outer-layer main reinforcements are placed in the bored holes, and outer-layer stiffening rings are welded to the inner walls of the arranged outer-layer main reinforcements; all the inner-layer main reinforcements are sequentially and vertically welded along the inner circumferential wall of the outer-layer stiffening ring to form an inner-layer reinforcement cage; a movable inner-layer stiffening ring is vertically welded in the length direction of the i