Installation requirements for bored piles:

    (1) The steel cage installation does not match the design elevation

    Preventive measures: After the steel cage is finished, pay attention to prevent its distortion. When installing the steel cage into the hole, keep it vertical. The spacing between the concrete protective layer pads should not be too large. The length of the hanging reinforcement should be accurately calculated and repeated during installation.

    (2) Floating of steel cage

    Preventive measures for the floating of the steel cage: strictly control the quality of the concrete, the slump is controlled at 20±2cm, and the concrete workability is better. After the concrete enters the steel cage, the concrete should not rise too fast, the buried depth of the pipe in the concrete should not be too large, and strictly control it between 2-6m in accordance with the specification. When lifting the pipe, it should not be too fast to prevent the pipe from hooking the steel cage and bring it First class.