正循环钻进反循环清孔工艺在钻孔灌注桩穿越超厚砂层施工中的应用  

Application of Normal Circulation Drilling and Reverse Circulation Hole Cleaning Technology in Construction of Bored Pile Passing Through Super Thick Sand Layer

作　　者：张海宝 喻涛 毛晓晴 钟斌 郑生机 ZHANG Haibao;YU Tao;MAO Xiaoqing;ZHONG Bin;ZHENG Shengji(CCTEB Infrastructure Construction Investment Co.,Ltd.,Wuhan,Hubei 430065,China)

机构地区：[1]中建三局基础设施建设投资有限公司,湖北武汉430065

出　　处：《施工技术》2021年第5期94-97,共4页Construction Technology

摘　　要：武汉东四环线钻孔灌注桩需穿越超厚砂层施工,针对本工程地质条件特点,通过对成孔工艺、清孔工艺进行比选组合和试桩试验,最终确定采用正循环回旋钻机钻进,终孔后采用空压机反循环清孔的工艺,保证了钻孔灌注桩施工的质量和进度。同时,针对性提出了该工艺的关键控制技术,积累了穿越超厚砂层钻孔灌注桩施工的经验。The bored pile of Wuhan East Fourth Ring Road needs to pass through the super thick sand layer for construction.According to the characteristics of geological conditions of the project,through the comparison and combination of hole forming technology and hole cleaning technology and pile test,it is finally determined that the normal circulation rotary drilling machine is used for drilling,and the air compressor reverse circulation hole cleaning technology is used after the final hole,so as to ensure the quality and progress of bored pile construction.At the same time,the key control technology of the process is put forward,and the construction experience of bored pile through super thick sand layer is accumulated.

关 键 词：桥梁工程 超厚砂层 钻孔灌注桩 正循环钻进 反循环清孔 施工技术 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]