提高钻孔桩桩底压浆工效及保证质量的技术措施

Technical Measures to Increase Work-efficiency and Ensure Quality of Pile Bottom Grouting for Bored Pile

摘要:

钻孔桩桩底压浆技术是向钻孔灌注桩桩底沉渣和围岩土体内压入一定量水泥浆，使桩底沉渣和桩底一定范围土体孔隙内充满水泥浆液，经物理、化学作用使其强度大幅提高，从而实现单桩竖向承载力的提高。结合高铁钻孔桩桩底压浆施工实践，介绍了2种压浆工艺过程，阐明了提高压浆工效、保证注浆质量关键技术措施实施的重要性。

Abstract:

Pile bottom grouting for bored pile means grouting cement slurry into the sediment and surrounding soil mass to largely increase their strength by fully filling the soil pore of the sediment at the pile tip and the soil mass to a certain range. By the physical and chemical effect, the strength was greatly enhanced to increase the vertical bearing capacity of single pile. Based on the construction practice of pile bottom grouting for bored pile of high speed railway, the paper introduced two kinds of grouting process and elucidated the importance of improving working efficiency, ensuring grouting quality and the implementation of key technical measures.