混凝土灌注桩桩头渗水的处理及预防措施

Treatment of Seepage at Bored Concrete Pile Head and the Prevention Measures

摘要:

混凝土灌注桩桩头渗水对桩体混凝土受力和基底防水产生影响，对混凝土结构中的钢筋造成腐蚀。结合工程实例，对桩头渗水产生的原因进行分析，主要有操作经验不足、责任心不强，灌注器具不合格，混凝土质量指标不符合要求，灌注接近结束时拔管速度过快、灌注终了超灌高度测量不准，基土含水量高、水压大等；出现桩头渗水可采用人工剔除或注浆封堵处理；介绍了预防措施，包括加强作业人员培训，强化灌注器具检查，严控混凝土质量，重点监管终灌时的状态，做好基坑内降水工作等。

Abstract:

The seepage at bored concrete pile head has influence to pile concrete stress and foundation bottom waterproof, even leads to corrosion of the reinforcing steel in concrete structure. Combined with the engineering case, the analysis was made to find the main causes of pile head seepage: lack of operation experience and responsibility, unqualified grouting tools, improper concrete quality indexes, too fast pipe drawing at grouting completion, inaccurate measurement of the exceeding height for grouting standard, high water content of foundation soil, high water pressure and etc. with treatment measures of part digging out or blockage by grouting being put forward. The paper introduces the prevention measures including personnel training, apparatus examination, concrete quality control, grouting finishing condition inspection and foundation pit dewatering.