In the construction of bored pile, it is very easy to break the pile due to the influence of operation error, bad equipment and hydrogeological conditions.In general, there are four common forms of broken piles:

1. The concrete pile and bedrock are filled with non-solidified concrete software.The reason is that the concrete is diluted by the washing liquid because the pipe is too far from the bottom of the hole, which increases the water-cement ratio and causes the concrete not to solidify.
2. Concrete noncondensate appears in the middle section of pile body.The reason is affected by the groundwater activity or the pipe seal is not good.

3. Rock slag deposits into layers in the pile body, separating the concrete pile upper and lower.The reason is that when pouring concrete, the conduit is lifted and pulled too much and too fast, exposing the concrete surface, or slag inclusion is caused by power failure, waiting for materials and other reasons.
4. the pile appeared hollow body.The reason is that the "back to the top" method is not used, but the method of pouring directly from the orifice is used to pour concrete, resulting in segregation, which causes non-compactness and hardness after solidification, and some hole sections have loose and empty phenomena.

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