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深江铁路洪奇沥公铁大桥主桥设计关键技术

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研究目的:洪奇沥公铁大桥是深江铁路的控制性工程,主桥采用主跨808 m公铁合建斜拉桥一跨跨越洪奇沥水道,上层布置8车道城市快速路,下层布置4线铁路.结合建设条件、结构特点及使用性能,对主桥结构体系、主梁横断面及结构形式、索-塔锚固结构、施工方法等关键技术展开研究,确定技术合理可行和经济节约的设计方案.研究结论:(1)首创了短边跨叠合板-桁组合梁斜拉桥结构体系,主桥长度减少20％,节省工程投资;(2)首次在4线铁路公铁合建斜拉桥上采用倒梯形双主桁截面,桥面布置紧凑、受力明确;(3)提出的边跨主梁采用矩形钢管混凝土叠合板-桁组合结构,集结构受力和锚固压重于一体,施工便捷;(4)发明了"自平衡交叉锚固+齿块锚固"的索-塔混合锚固方式,技术经济性高;(5)钢主梁创新采用"纵向大节段+横向分块"施工方法,解决了超宽超高超重整节段钢桁梁运输受既有桥净空限制的难题;(6)本研究成果可为公铁合建桁梁斜拉桥设计提供参考或借鉴.
Key Design Technologies of Main Bridge of Hongqili Rail-cum-road Bridge on Shenzhen-Jiangmen Railway
Research purposes:The Hongqili Rail-cum-road Bridge is control project of the new Shenzhen-Jiangmen Railway.The main bridge is a cable-stayed bridge with a main span of 808 m across the Hongqili Waterway.The upper layer is arranged with the 8-lane urban expressway,and the lower layer is arranged with 4-line railway.Combined with the construction conditions,structural characteristics and service performance,the key technologies such as structure system of the main bridge,the cross section and structural form of the main beam,the cable-tower anchorage structure and the construction method are studied to determine the reasonable and economical design scheme.Research conclusions:(1)The structural system of laminated slab-truss composite girder cable-stayed bridge with short side span is first proposed,which reduces the length of main bridge by 20％and saves engineering investment.(2)The inverted trapezoidal double main truss section is firstly adopted in the main girder of the 4-line rail-cum-road bridge,which makes the deck layout compact and the stress clear.(3)The proposed side span main girder adopts the rectangular concrete-filled steel tube laminated slab-truss composite structure,which integrates the stress and anchorage pressure of the structure,and is convenient for construction.(4)The cable-tower hybrid anchorage mode of"self-balanced cross anchorage+tooth block anchorage"is invented,which has high technical and economic efficiency.(5)The main girder creatively adopts the construction method of"longitudinal large section+transverse block",which solves the problem that the transportation of ultra-wide ultra-high overweight full block of steel girder is limited by the clearance of the existing bridge.(6)The research results of this paper can provide reference for the design of rail-cum-road cable-stayed bridge with truss girder.

rail-cum-road bridgeshort side span cable-stayed bridgedouble main trusslaminated slab-truss composite girderself-balanced cross anchorage

刘振标、夏正春、印涛、张晓江、徐伟伟、杨得旺

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中铁第四勘察设计院集团有限公司,武汉 430063

公铁合建 短边跨斜拉桥 双主桁 叠合板-桁组合梁 自平衡交叉锚固

国铁集团科技研发项目国铁集团科技研发项目中国铁建股份有限公司科技研发项目中铁第四勘察设计院集团有限公司科技研发项目中铁第四勘察设计院集团有限公司科技研发项目中铁第四勘察设计院集团有限公司科技研发项目

N2021G034N2023G0402021-B172021K0012021K0062021K015

2024

铁道工程学报
中国铁道学会 中国铁路工程总公司 中国中铁股份有限公司

铁道工程学报

CSTPCD北大核心
影响因子：0.996
ISSN：1006-2106
年,卷(期)：2024.41(2)
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