舟山与大陆联网工程螺头水道海中跨越塔全高199 m，其直径为2 200 mm的嵌岩灌注桩基础的施工是整个工程的重点与难点。结合该桩基施工实践，介绍了局部无护筒支护穿越粉质粘土层的嵌岩灌注桩施工技术，包括冲击成孔施工工艺、钢平台搭设、护壁泥浆配置、嵌岩桩成孔孔径质量控制、成孔、清孔、钢筋笼制作安装、水下混凝土灌注等施工技术。

In this paper, we discuss the construction technologies of rock-socketed bored piles (RCP)through silty clay layer without protection in part by steel protective pipe, which is considered as the most important and difficult part of the whole was demonstrated according to RCP construction practice in the Luotou watercourse sea tower construction work (199 m in height and 2 200 mm in diameter of RCP of the foundation)of the Zhoushan lsland-mainland transmission line interconnection project in China. The main technologies including the construction methods for punching technology, building of steel platform, configuration of protective slurry, quality control of RCP punched aperture, punching methods, the clearance of pits, the installation of steel reinforcement cages and underwater concrete pouring are also introduced.