摘要
青岛市地铁7号线周村站基坑开挖深度大,存在富水砂层、复合地层等不良地质条件,桩基成孔质量要求高.通过工程经验类比、泥浆护壁成孔与长护筒护壁成孔桩基施工技术分析,提出了长护筒成孔桩基施工技术在青岛地铁深大基坑中的应用方法.详细阐述了桩位放样、护筒定位及埋设、钻机就位、校核护筒垂直度、钻孔取土、下放长护筒、钻机钻进直至清孔、下放钢筋笼、安装导管、灌注水下混凝土、起拔钢护筒的长护筒成孔桩基施工工艺.
Abstract
The depth of the foundation excavation of Zhoucun Station of Qingdao Metro Line No.7 is large,and there are ad-verse geological conditions such as saturated sand layers and complex strata at the project site.The cast-in-place concrete pile has restrictive requirements for the borehole quality.Throughout the engineering experience and the analysis of the installation method of the bored piles with slurry wall and the long-cased drilling method,this paper proposes an application method of the bored pile with the long casing in the deep excavation support of the Qingdao Metro.The bored pile installation with long cas-ing drilling is introduced in detail,including pile equipment set up,positioning and casing setup,positioning of the drilling rig,checking the casing plumbness,drilling in the soil,lowering of long casing,advancing and borehole cleanup,lowering the rein-forcement cage,installation conduit,tremie concrete pouring,and lifting of steel pile casing.
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