松散液化土层中旋挖桩施工关键技术  

Key Technological Discussion of Rotary Drilling Bored Piles in Loose and Liquefiable Soil Layer

作　　者：王昆泰[1] 

机构地区：[1]中国建筑科学研究院地基基础工程有限责任公司,北京100013

出　　处：《建筑科学》2015年第11期109-113,共5页Building Science

摘　　要：结合工程实际地层条件,分析了旋挖工艺在松散砂土地层中塌孔原因,指出钻斗抽吸力对孔壁稳定的不利影响;从钻斗结构和操作方式两个方面,提出了减小抽吸力的技术措施;根据地层和工艺特点,介绍了使用旋挖工艺控制塌孔的关键和辅助技术,以期扩展旋挖工艺的适用性和为类似工程提供参考。Combined with practical engineering geological conditions,the reason of hole collapse is analyzed and the negative influence of rotary digging drill bucket suction to wall of hole is pointed out. Based on the drill bucket structure and operational approach, the technical measures for decreasing the drill bucket suction are suggested. According to the character of soil layer and rotary bucket drilling, the key and auxiliary technological means are introduced to prevent the wall of hole from collapsing. The aim of the paper is to extent the applicabity of rotary drilling bored piles and provides a reference for resembling projects.

关 键 词：钻孔灌注桩 旋挖工艺 钻斗抽吸力 松散土层 

分 类 号：TU753.8[建筑科学—建筑技术科学]