港珠澳大桥江海直达船航道桥主墩承台施工

摘要

港珠澳大桥江海直达船航道桥主墩承台采用有底钢套箱施工,桥址气象水文条件复杂,承台体积大,各种预埋装置多,防腐蚀性要求高,采用有底套箱,且与防撞结构相结合.套箱与底板分次下放,套箱整体拼装完成后,运输至现场,浮吊整体吊装.承台采用水下混凝土封底,封底混凝土、套箱侧模及底板重量全部由精扎螺纹钢承担.该施工方法可为后续施工提供借鉴.%The main pier pile caps of the channel bridge for river-sea direct ships of the Hongkong-Zhuhai-Macao Bridge are constructed with bottom steel boxed cofferdam construction.The meteorological hydrological conditions of the bridge site are complex,pile caps is big volume,a variety of embedded devices,anticorrosive demand is high,we adopted the bottom boxes and combined with the anti-collision structure.The casing and the bottom plate are subdivided,and the whole assembly of the box is finished and transported to the site and the floating crane is hoisted.The platform adopts the underwater concrete cover,and the weight of the bottom concrete,the box side mould and the bottom plate are all borne by the fine steel.The construction method provides reference for subsequent construction.