松散土层大直径钻孔灌注桩施工技术  

Construction Technology of Large-diameter Bored Cast-in-Place Pile in Loose Soil Layer

作　　者：芮俊雄 RUI Junxiong(Jiangsu Leiwei Construction Engineering Co., Ltd., Nanjing 210003)

机构地区：[1]江苏雷威建设工程有限公司

出　　处：《常州工学院学报》2019年第5期59-62,共4页Journal of Changzhou Institute of Technology

摘　　要：以光华路东延段跨绕城公路立交工程中的21#-4端承桩为案例进行研究。针对易塌孔土质,采用GPS20正循环钻机结合SR280R旋挖钻机二次开孔的施工工艺,利用C20细石混凝土护壁保障成桩质量。桩基成孔后采用RSM-HGT(F)超声波成孔质量检测仪检测成孔质量,采用ANY-1型泥浆3件套测试仪以及沉渣检测仪检测桩孔各项指标。结果表明:桩孔孔壁竖直光滑,孔径、孔深以及垂直度均满足设计要求,未出现塌孔和扩孔的现象,各项检测指标均在设计标准范围内,说明该钻孔灌注桩施工工艺可以用于易塌孔土质区域进行桩基施工。In this paper,the actual case of 21#-4 end bearing pile in the trans-ring highway overpass project of the east extension section of Guanghua road is used to analyze and study the construction technology of the GPS20 positive cycle drilling machine combined with the SR280R rotary drilling machine for the construction of the soil of easily collapsed hole,and the C20 fine stone concrete retaining wall is used to guarantee the quality of the pile.After the hole formation of pile foundation,RSM-HGT(F)ultrasonic hole formation quality detector is used to detect the hole formation quality,and ANY-1 type mud 3-piece set tester and sediment detector are used to detect various indexes of pile hole.The results show that the hole wall of the bored pile is vertical and smooth,the hole diameter,hole depth and perpendicularity all meet the design requirements,and there is no phenomenon of hole collapse and ream.

关 键 词：易塌孔土质 正循环水钻 旋挖钻 混凝土护壁 

分 类 号：U445.55[建筑科学—桥梁与隧道工程]