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

作者:张海宝 喻涛 毛晓晴 钟斌 郑生机
单位:中建三局基础设施建设投资有限公司
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。
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
作者简介:张海宝,工程师,E-mail:531366850@qq.com。
基金: -页码-:94-97
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Application of Normal Circulation Drilling and Reverse Circulation Hole Cleaning Technology in Construction of Bored Pile Passing Through Super Thick Sand Layer
ZHANG Haibao YU Tao MAO Xiaoqing ZHONG Bin ZHENG Shengji
(CCTEB Infrastructure Construction Investment Co.,Ltd.)
Abstract: 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.
Keywords: bridges; super thick sand layers; bored piles; normal circulation drilling; reverse circulation in hole cleaning; construction
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