Construction Scheme for Embedded Pile Caps of Sea-Crossing Bridge Projects of Hongkong-Zhuhai-Macao Bridge
Construction Scheme for Embedded Pile Caps of Sea-Crossing Bridge Projects of Hongkong-Zhuhai-Macao Bridge
复制标题
港珠澳大桥跨海大桥工程预埋桩帽施工方案
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Jing Qian
中科院分区：
文献类型：
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作者：
Jing Qian
港珠澳大桥非通航跨海大桥承台采用预制拼装技术，后浇混凝土与桩基连接，为克服桥址复杂的地质环境条件，采用大圆筒干式拼装、分离式胶囊柔性止水和无内支撑双壁互锁钢套箱围堰，采用大圆筒、钢套箱、承台与钢管桩连接处设置分离式胶囊止水结构、钢套箱、封底混凝土，采用大型浮吊和八锤同步振动驱动器驱动大圆筒，分离式胶囊止水结构主要由环形底盘、内止水胶囊、外止水胶囊、内止水胶囊、外止水胶囊、内止水胶囊、内止水胶囊、外止水胶囊、内止水胶囊、内止水胶囊、外止水胶囊、外止水胶囊、内止水胶囊、外止水胶囊、外止水胶囊、内止水胶囊、外止水胶囊、内止水胶囊、外止水胶囊、外止水胶囊、内止水胶囊、外止水胶囊、内止水胶囊、外双壁联锁钢箱围堰采用分段拼装、整体下沉、整体拆除的施工工艺，从可行性、施工效果、工程实践证明，三种方案均能较好地克服恶劣海况的影响，具有良好的适用性和施工效率，能保证承台施工按期完成。
The non-navigable sea-crossing bridge of Hongkong-Zhuhai-Macao Bridge seats on embedded pile caps that are constructed by prefabricating and assembling technique and connected to the pile foundation by the post concreting.To overcome the complex geological and environmental condition at the bridge site,the piles caps were constructed by combined use of three schemes,including the dry assembly with large cylinder,flexible water stopping by separated capsules and the double-wall interlocked steel box cofferdam with no inner bracing.The large cylinder,steel cofferdam and water stopping structure with separated capsules installed at the connection of the pile cap and the steel pipe pile,steel box cofferdam and base sealing concrete were used,such that dry construction environment can be created for the integrated installation of the pile cap and casting of the post cast concrete.The large cylinder was driven using large-scale floating cranes and the vibration driver with eight synchronized hydraulic hammers.The separated capsule water stopping structure is mainly made up of ring chassis,inner water stopping capsules,top GINA sealing belt and the tensioning and tightening devices.The double-wall interlocked steel box cofferdam adopts the technique of block-by-block assembling,monolithic sinking and demolition.The three schemes were analyzed from aspects of feasibility,construction effect,construction convenience and economy.The engineering practice proves that all the three schemes are able to overcome the influence of the severe sea condition well,have sound applicability and construction efficiency,and can ensure the pile cap construction to be completed in the scheduled period.