浅谈旋挖灌注桩的沉渣问题控制

Discussions on the Drilling Debris Control in Rotary Drilling of Cast-In-Place Concrete Piles

随着旋挖灌注桩在建设领域的广泛应用,其沉渣问题引起的承载力评价不足日益引起工程关注。基于厦门地区的检验检测实践,从套管护壁施工、清孔工艺、水下混凝土灌注、后注浆工法、现场作业质量管理等五个方面对旋挖灌注桩的沉渣控制技术予以阐述,并通过实测比对数据证明其可靠性,以供相关工程借鉴参考。

With a wide application of rotary drilling of cast-in-place concrete piles in the foundation construction projects,the insufficient axial capacity induced by the excessive deposition of drilling debris at the bottom of the borehole has attracted more and more attention.Based on the foundation construction inspection practice in Xiamen,this paper presents the drilling debris control method of rotary drilling of cast-in-place concrete pile from the following five aspects:application of casing for the borehole protection;borehole cleaning technology;tremie concrete pouring;post-grouting and quality control of site operation.By comparing the measured construction monitoring data,all the above measures are proved to be reliable and provide as references for future relevant projects.