冲孔灌注桩+工法桩组合支护体系在沿海深基坑工程中的应用

Application of Combined Support System of Perforated Pile and Construction Pile in Coastal Deep FoundationPit Engineering

文中以福建沿海地区某工程为依托,对沿海深基坑中冲孔灌注桩+工法桩组合支护体系的施工技术深入探析。实践表明,基坑周边的位移变形量均满足设计值,支护结构自身变形及坑体位移控制方面均取得了良好效果。此外,施工完成28 d后,对冲孔灌注桩进行钻芯取样,其强度达到1.8 MPa,且观察到冲孔灌注桩及工法桩桩身完整,无渗水现象。

Based on a project in the coastal area of Fujian Province,this paper makes an in-depth analysis on the construction technology of the combined support system of punched pile and construction pile in the deep foundation pit along the coast.The practice shows that the displacement and deformation around the foundation pit meet the design value,which indicates that the deformation of the supporting structure and the displacement control of the pit have achieved good results.In addition,28 days after the completion of construction,the drilling core sampling of the punched pile was carried out,and its strength reached 1.8 MPa,and the integrity of the punched pile and the construction pile can be obviously observed during the core drilling process,and no water seepage phenomenon.