港珠澳大桥浅水区非通航孔桥下部结构施工关键技术  

Key Techniques for Construction of Substructure of Non-Navigable Span Bridge of Hong Kong-ZhuhaiMacao Bridge over Shallow Water Area

作　　者：陈山亭[1] 

机构地区：[1]中铁大桥局集团第五工程有限公司,江西九江332001

出　　处：《桥梁建设》2016年第1期6-11,共6页Bridge Construction

摘　　要：港珠澳大桥浅水区非通航孔桥为跨径85m的钢-混组合连续梁桥,该桥下部结构由钢管复合桩基础、预制承台及矩形空心墩组成,全桥共62个墩,每墩均由6根钢管复合桩组成。为解决下部结构施工受海况影响的难题,缩短工期,保证施工质量,复合桩钢管插打时,采用支撑桩辅助整体式导向架三次定位技术;钻孔灌注桩采用整体桁架式钻孔平台辅助施工技术;墩台预制采用一体化自动开合模板技术,承台及底节墩身采用整体一次性浇筑技术;承台和底节墩身安装采用新型的无内支撑双壁锁口钢套箱围堰辅助施工技术,墩身(帽)采用长短导向架辅助吊船快速安装技术。The non-navigable span bridge of the Hong Kong-Zhuhai-Macao Bridge over the shallow water area is a 85-m span steel and concrete continuous composite girder bridge. The sub- structure of the bridge is composed of the steel pipe composite piles, precast pile caps and rectan- gular hollow piers. There are totally 62 piers for the whole bridge of the bridge and each pier is supported on the 6 steel pipe composite piles. To resolve the problem that the construction of the substructure would be adversely affected by the sea conditions and to shorten the construction time period and ensure the construction quality, the following techniques were applied to the construc- tion. When the steel pipes of the composite piles were set and driven, the steel pipes were posi- tioned in three times, using the integral guide frames aided by the support piles. The boring con- struction of the composite piles was carried out on the integral truss boring platforms. The pier shafts and pile caps were precast, using the integrated automatic opening and closing formwork and the concrete of the pile caps and base segments of the pier shafts was cast integrally in one time. The pile caps and base segments were installed in the new type of the interlocked double-wall steel boxed cofferdams without internal bracings and the pier shafts and pier caps were installed by the rapid method, using the floating vessels aided by the long and short guide fames.

关 键 词：跨海桥梁 连续梁桥 下部结构 钢管复合桩 钻孔平台 预制 安装 施工技术 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U445.55[交通运输工程—道路与铁道工程]