旋挖成孔灌注桩在桥梁桩基础中的应用

结合重庆市开县九孔桥桩基础施工,对钻机选型和成孔工艺进行了比选,介绍了泥浆护壁与全护筒2种不同成孔工艺在旋挖钻中的运用情况,阐述了施工准备、成孔质量、钢筋笼制作及水下混凝土灌注等施工过程的质量控制方法,桩基础分部工程的验收方法及问题处理过程。通过开县九孔桥桩基础的实践,对旋挖桩施工常见问题的原因进行了分析并提出了有效预防措施。

Application of rotary drilling cast-in-place pile in bridge pile foundation

Based on the construction of pile foundation of Jiukong Bridge in Kaixian County of Chongqing City, different types of drilling machine and the drilling technique are compared and selected. The application of two drilling methods, namely, slurry wall and full casing, in rotary machine-drilling is introduced. Quality control methods in engineering steps including construction preparation, quality of drilling, making of steel cage, underwater concrete casting are explained, and the project acceptance method of the pile foundation and its treatment methods are proposed. Through the practice of pile foundation construction of Jiukong Birdge, the causes of common problems of rotary drilling cast-in-place pile are analyzed and effective preventive measures are put forward. 