某桥梁钻孔灌注桩掉钻分析及治理

Analysis and Management on Drill Falling of Cast-in-situ Piles for a Bridge

钻孔灌注桩在施工过程中会因复杂的地质情况或施工操作、机械原因发生掉钻。依托某桥梁钻孔灌注桩施工,对产生掉钻原因进行了分析。介绍了治理掉钻的方案,包括原位打捞、扩大桩径及加桩等,最终通过比选确定最优方案。该工程案例选择加桩法,但需重新计算各桩反力确保安全。

There are many factors to cause the drill falling in the construction of cast-in-situ piles, such as the complex geological conditions, construction operation and mechanical causes. This paper analyzes the cause of drill falling in the construction of cast-in-situ piles for a bridge, and introduces the management scheme of drill falling including the in-situ salvage, expansion of pile diameter and increment of pile number.Finally, the optimal scheme is elected after comparison. The increment method of pile is selected for this project, but it is required to recalculate the reaction force of every pile in order to ensure the safety.