潜水钻机在粘性土中的成孔技术

Boring Technology by Submersible Drill in Cohesive Soil

摘要:

沿海地区第四系覆盖层,上部软土地层主要为粘性土。钻孔灌注桩在釆用潜水钻机成孔过程中，上部软粘土对成孔质量和最终成桩质量的影响都很大。潜水钻机成孔过程中出现的质量问题主要有桩顶冒水、桩身夹泥、缩径、露筋、糊钻、成孔垂直度差等，分析了产生这些质量问题的原因。总结潜水钻机在粘土中成孔控制的技术要点，包括施工准备阶段、施工阶段、清孔阶段的控制，以及其他措施。

Abstract:

The upper soft soil layer is mainly cohesive soil in coastal quaternary overburden layer, which has great effects on the hole and the final pile quality in the drilling process of submersible drill. The quality problems are water emitting from the top of pile, mud mixed in pile body, diameter shrinkage, reinforced steel exposing, bit balling and hole verticality deviation, and these related causes are analyzed. The paper summarizes the key points of boring control technology by submersible drill in clay, including the control in construction preparation stage, construction stage and hole cleaning stage, as well as other measures.