洛溪大桥拓宽工程斜拉桥主塔基础设计与施工  

Design and Construction of Main Pylon Foundation of Cable-stayed Bridge in Luoxi Bridge Widening Project

作　　者：谢尉鸿[1] 陈睿[1] 牟军[2] Xie Weihong;Chen Rui;Mou Jun

机构地区：[1]四川西南交大土木工程设计有限公司广州分公司,广东广州510095 [2].广东省长大公路工程有限公司,广东广州511431

出　　处：《城市道桥与防洪》2019年第8期104-107,M0013,M0014,共6页Urban Roads Bridges & Flood Control

摘　　要：洛溪大桥拓宽工程主桥采用双塔双索面叠合梁斜拉桥,主跨305m,主塔采用变异钻石型塔,塔墩基础采用群桩基础。为满足水利防洪要求,北岸主塔基础采用低桩承台,双壁钢围堰施工,南岸主塔基础采用高桩承台,单壁套箱施工。其中南岸新建主塔基础紧挨旧桥基础,为减小新桥基础规模,降低新桥建设对旧桥基础的影响,主塔基础采用变截面钻孔灌注桩,既满足了结构受力需要,又降低了工程造价,可为以后类似桥梁结构设计、施工提供参考。The main bridge of Luoxi Bridge Widening Project is a double-pylon double-plane superposed beam cable-stayed bridge. Its main span is 305 m. Its main pylon is a variant diamond-type pylon. The pylon pier foundation is a pile group foundation. In order to meet the hydraulic engineering and flood control requirements,the foundation of the main pylon on the north coast is a low-pile base slab and is constructed of double-wall steel cofferdam, and the foundation of the main pylon on the south coast is a high-pile base slab and is constructed of single-wall casing box. And the new built foundation of the main pylon on the south coast is next to the old bridge foundation. In order to decrease the scale of the new bridge foundation, and to reduce the influence of the new bridge construction on the old bridge foundation, the foundation of the main pylon adopts the variable cross-section cast-in-situ piles, which not only meets the structural stress requirement, but also reduces the engineering cost, and can be referred for the structural design and construction of the similar bridges.

关 键 词：洛溪大桥 斜拉桥 主塔基础 变截面桩 双壁钢围堰 单壁套箱 设计 施工 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]