Anti-floating construction method and device for large-diameter cast-in-situ bored pile steel reinforcement cage

The invention discloses an anti-floating construction method and device for a large-diameter cast-in-situ bored pile steel reinforcement cage. The method comprises the steps that the welded steel reinforcement cage is perpendicularly placed in a large-diameter cast-in-situ bored pile; the top of the steel reinforcement cage is higher than the height of an opening of a large-diameter bored hole; a steel tube frame is arranged on the top of the steel reinforcement cage, and counter weights are arranged on the steel pipe frame; perfusion construction is carried out; the steel reinforcement cage is prevented from floating through the counter weights in the perfusion process, and therefore the perfusion quality of the large-diameter cast-in-situ bored pile steel reinforcement cage is ensured. The method and device are suitable for constructing hole pile steel reinforcement cages with the diameter of 3m and more than 3 m in a cast-in-situ bored (stamped) pile and have the advantages of being obvious in anti-floating effect, easy to manufacture and mount, low in investment cost and the like.