摘要
湖北观音寺长江大桥主桥为(350+1160+350)m混合式组合梁斜拉桥。该桥设计过程中对跨径布置、桥型方案、主梁方案、结构体系等进行系统研究。为最大限度地减少桥梁对长江航道、河道行洪等的影响,确定采用1160 m主跨一孔跨过可通航水域。综合考虑建设条件、结构性能、施工难度、安全风险、经济性等因素,最终选取斜拉桥方案。为降低结构自重、充分发挥材料性能、提高桥面耐久性,主梁采用边跨377 m混凝土箱梁+中跨两侧401 m钢-UHPC组合梁+中跨跨中304 m钢-UHPC轻型组合桥面钢箱组合梁的混合式组合梁。结构体系采用带纵向约束的弹性半飘浮体系。桥塔采用中、下塔柱混凝土结构+上塔柱钢壳组合结构A形塔,塔高262 m,基础采用直径3.2 m的钻孔灌注群桩基础。斜拉索采用标准抗拉强度2100 MPa的高强度锌铝合金镀层平行钢丝拉索,斜拉索与塔、梁端均采用钢锚箱锚固。辅助墩、过渡墩均采用空心截面双柱墩,下设分离式承台+群桩基础。
The main bridge of Guanyinsi Changjiang River Bridge in Hubei Province is a hybrid girder cable-stayed bridge with a main span of 1160 m and two side spans of 350 m.In the design of the bridge,the span arrangement,bridge types,superstructure configuration and structural system were systematically studied.To minimize the interruption of the bridge to the navigation channel of the Changjiang River and waterway flood diversion,the bridge was expected to have a main span of 1160 m,capable of crossing the navigation area without river piers.By the comprehensive consideration of multiple factors,including construction condition,structural performance,construction challenge,safety risk and economy,the cable-stayed bridge solution was finally determined.To limit the self-weight of the structure,give full play to the material properties and improve the deck durability,the superstructure is designed to contain girders and decks of different materials in the central and side spans,specifically 377 m-long concrete box girders in each side span and 401 m-long steel-UHPC composite girders flanked the 304 m-long steel-UHPC lightweight composite girders in the central span.In terms of structural system,the bridge belongs to an elastic semi-floating system with longitudinal constraints.The pylons are A-shaped structures rising 262 m,where the lower and intermediate pylon columns are concrete structures while the upper columns are steel shell and concrete core composite structures.The pylon foundation is composed of bored piles of 3.2 m in diameter.The stay cables,which consist of high-strength Zn-Al alloy coated steel wires with a nominal tensile strength of 2100 MPa,are anchored to the pylons and the superstructure via steel anchor boxes.The auxiliary and transition piers are two-column piers of void cross-section,each supported on split pile caps and group pile foundation.
作者
冯鹏程
刘新华
易蓓
陈杨明
FENG Peng-cheng;LIU Xin-hua;YI Bei;CHEN Yang-ming(CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第S01期1-8,共8页
Bridge Construction
基金
国家重点研发计划项目(2018YFC0705400)。
关键词
斜拉桥
混合式组合梁
UHPC桥面板
弹性半飘浮体系
组合桥塔
平行钢丝拉索
钢锚箱
桥梁设计
cable-stayed bridge
hybrid-type composite girder
UHPC deck
elastic semi-floating system
composite pylon
parallel-steel-wire cable
steel anchor box
bridge design
