砂层地质大直径超深扩底桩施工技术  

CONSTRUCTION TECHNIQUE OF LARGE-DIAMETER SUPER-DEEP UNDERREAMED PILE IN SANDY STRATUM

作　　者：钟远享 王国强 冀凯玄 付欢 李兴卫 羊伟 ZHONG Yuan-xiang;WANG Guo-qiang;JI Kai-xuan;FU Huan;LI Xing-wei;YANG Wei(BCEG International Construction Group Co.,Ltd.,100054,Beijing,China)

机构地区：[1]北京国际建设集团有限公司,北京100054

出　　处：《建筑技术》2022年第6期675-678,共4页Architecture Technology

摘　　要：扩底桩具备承载力高、成孔速度快的特点,在承载力要求相同的情况下可缩短桩长或减少桩径。依托北京城市副中心站综合交通枢纽工程为背景,阐述了砂层地质条件下大直径超深扩底桩在盖挖逆作车站中的应用。基于富水砂层的特性,对扩底桩展开了研究分析,详细介绍了超长大直径旋挖钻孔扩底桩技术。Underreamed pile has high bearing capacity and fast hole forming characteristics,so it could reduce pile length or pile diameter under the same bearing capacity requirement.Based on Beijing suburban sub-center station traffic hub project,this paper introduced the application of super-large diameter and super-deep underreamed pile in covered excavation in sandy stratum.Considering the characteristics of rich-water sandy stratum,it analyzed the underreamed pile and introduced in details the construction technique of super-long and large-diameter rotary drilling underreamed pile.

关 键 词：盖挖逆作 大直径桩基 旋挖扩底 施工技术 

分 类 号：TU753[建筑科学—建筑技术科学]