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导管脱离混凝土面、未采取有效施工工艺及孔底沉渣太厚等是灌注桩发生质量缺陷的主要原因,从综合分析资料初步诊断;桩体钻孔取芯检查,准确分析,制定处理方案;施工洗井孔;群孔冲洗法洗孔;高压灌浆;确保灌浆效果的措施等多方面阐述了诊断处理缺陷桩的方法及效果检验方法,且通过工程实例证明桩体上直接钻孔-群孔冲洗-高压灌浆方法处理灌注桩的断桩、混凝土严重离析及松散、桩底沉渣厚等质量缺陷是有效性。
The main reason for the quality defects of cast-in-situ piles is that the conduit is separated from the concrete surface, the effective construction technology is not taken, and the bottom sediment is too thick. The preliminary diagnosis is made based on the comprehensive analysis data; the core of the piles is checked and accurately analyzed to determine the treatment plan; Hole cleaning method, group hole flushing method, high-pressure grouting, ensuring grouting effect, and other aspects of the method of diagnosis and treatment of defects in the pile method and the effect of testing methods, and through examples of projects to prove that the direct drilling hole - hole flushing - High-pressure grouting method to deal with the broken stake piles, serious segregation and loose concrete, pile bottom sediment thickness and other quality defects is effective.