横琴口岸工程填海软土地区大规模超长桩基施工技术

CONSTRUCTION TECHNOLOGY OF LARGE-SCALE SUPER-LONG PILE FOUNDATION IN SEA-FILLED SOFT SOIL AREA OF HENGQIN PORT PROJECT

横琴口岸及综合交通枢纽开发工程场地原始地貌属填海软土区域,淤泥层最厚约20m。工程桩超过6500根,最长超过110m,以中风化岩层作为持力层,中风化岩层中蚀变带内岩芯较破碎。通过比选采用旋挖桩施工方式,通过实施硬底化、高频免震动下长护筒、钢筋笼半自动加工技术等方法,在180d内完成6500根工程桩,经检测一类桩达到95%,无三、四类桩。

The original landform of the Hengqin Port and Comprehensive Transportation Hub Development Project is a reclaimed soft soil area,and the silt layer is about 20 m thick.The engineering piles exceed 6500,and the longest length exceeds 110 m.The medium weathered rock layer is used as the supporting layer,and the core in the alteration zone of the medium weathered rock layer is relatively broken.Through comparison and selection of the construction method of rotary excavated piles,through the implementation of hard bottoming,high-frequency vibration-free long protective tube,steel cage semi-automatic processing technology,etc.,6500 engineering piles were completed within 180d,and the first-class piles were tested 95%,no three or four types of piles.