白洋长江公路大桥主桥设计
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摘要
白洋长江公路大桥主桥为主跨1 000m的双塔单跨钢桁梁悬索桥,北岸边缆跨度276m,南岸边缆跨度269m。该桥采用塔连杆+柔性中央扣支承体系,通过塔连杆的转动满足加劲梁纵向位移与转动要求。桥塔采用混凝土门形结构,北塔高142.5m,南塔高151m,基础为分离式承台+群桩基础。钢桁梁全宽36.7m,高7.5m,采用2片主桁,华伦式桁架,主桁与桥面系分离,桥面系采用钢-混组合桥面系。充分利用长江优质航道资源及桥下水深条件好的优势,钢桁梁采用30m大节段吊装。主缆采用1 860MPa锌铝合金镀层高强钢丝,吊索采用1 960MPa镀锌钢丝绳。主索鞍、散索鞍鞍体采用铸焊结合结构。主缆采用型钢锚固系统,白洋侧锚碇采用重力式嵌岩锚,宜都侧锚碇位于富水巨厚卵石层中,国内首次采用浅埋扩大基础。
The main bridge of Baiyang Changjiang River Highway Bridge is a steel truss suspension bridge with two towers and a main span of 1 000 m.The cable spans at northern and southern shore are 276 mand 269 m,respectively.The tower connecting rod+a flexible central buckle supporting system is adopted in the bridge,and the requirements of longitudinal displacement and rotation of the stiffening girder are satisfied by the rotation of the tower connecting rod.The tower with a concrete portal structure has a height of 142.5 min the north tower and 151 min the south tower.The foundation consists of a group of piles with separate pile cap.The full width of steel truss girder,of which two warren-type trusses are adopted,is 36.7 mand the height is 7.5 m,and the main truss and the bridge deck are separated.The bridge deck is a steel-concrete composite deck system.By taking the full advantage of high-quality fairway in Changjiang River and the deep water conditions under the bridge,the steel truss girder with a 30 mlarge segment is hoisted.The main cable is made of 1 860 MPa zinc-aluminum alloy coated high-strength steel wire,and the hanger is made of 1 960 MPa galvanized steel wire rope.The main cable saddle and splay saddle have a casting and welding structure.The main cable is anchored by the section steel anchorage system,anchorage on the Baiyang side is gravity rock-socketed anchorage,and anchorage on the Yidu side is located in the rich water thick cobble layer.The shallow buried spread foundation is adopted for the first time in China.
The main bridge of Baiyang Changjiang River Highway Bridge is a steel truss suspension bridge with two towers and a main span of 1 000 m.The cable spans at northern and southern shore are 276 mand 269 m,respectively.The tower connecting rod+a flexible central buckle supporting system is adopted in the bridge,and the requirements of longitudinal displacement and rotation of the stiffening girder are satisfied by the rotation of the tower connecting rod.The tower with a concrete portal structure has a height of 142.5 min the north tower and 151 min the south tower.The foundation consists of a group of piles with separate pile cap.The full width of steel truss girder,of which two warren-type trusses are adopted,is 36.7 mand the height is 7.5 m,and the main truss and the bridge deck are separated.The bridge deck is a steel-concrete composite deck system.By taking the full advantage of high-quality fairway in Changjiang River and the deep water conditions under the bridge,the steel truss girder with a 30 mlarge segment is hoisted.The main cable is made of 1 860 MPa zinc-aluminum alloy coated high-strength steel wire,and the hanger is made of 1 960 MPa galvanized steel wire rope.The main cable saddle and splay saddle have a casting and welding structure.The main cable is anchored by the section steel anchorage system,anchorage on the Baiyang side is gravity rock-socketed anchorage,and anchorage on the Yidu side is located in the rich water thick cobble layer.The shallow buried spread foundation is adopted for the first time in China.
引文
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[8]郝胜利,许国亮,纪晓壮,等.南京长江第四大桥北锚碇沉井不排水下沉施工关键技术[J].公路,2010(6):11-15.(HAO Sheng-li,XU Guo-liang,JI Xiao-zhuang,et al.Key Technologies of Undrained Sinking Construction of North Anchor Caisson of the 4th Changjiang River Bridge in Nanjing City[J].Highway,2010(6):11-15.in Chinese)
[9]李陆平,朱斌,罗瑞华.武汉杨泗港长江大桥主塔沉井硬塑黏土中下沉技术[J].桥梁建设,2018,48(4):1-5.(LI Lu-ping,ZHU Bin,LUO Rui-hua.Techniques of Sinking Open Caissons for Towers of Wuhan Yangsigang Changjiang River Bridge in Hard Plastic Clay[J].Bridge Construction,2018,48(4):1-5.in Chinese)
[10]沈斌.几种悬索桥锚碇结构基坑的施工风险分析及对策[J].公路交通科技,2008,25(4):108-112.(SHEN Bin.Construction Risks and Countermeasures of Some Different Kinds of Anchorage Pits of Suspension Bridge[J].Journal of Highway and Transportation Research and Development,2008,25(4):108-112.in Chinese)
[2]程丽娟,刘榕,李瑜.矮寨大桥缆索系统总体布置及结构设计[J].世界桥梁,2011(3):13-16.(CHENG Li-juan,LIU Rong,LI Yu.Overall Arrangement and Structural Design of Cable System of Aizhai Bridge[J].World Bridges,2011(3):13-16.in Chinese)
[3]杨海洋,钟铁毅,夏禾.中央扣对大跨度悬索桥地震响应影响及机理研究[J].铁道学报,2015,37(5):94-100.(YANG Hai-yang,ZHONG Tie-yi,XIA He.Study on Effect and Mechanism of Central Buckle on Seismic Responses of Long Span Suspension Bridge[J].Journal of the China Railway Society,2015,37(5):94-100.in Chinese)
[4]姚进,庄值政,张凤凰.山区悬索桥钢桁架加劲梁安装技术[J].公路,2013(7):82-87.(YAO Jin,ZHUANG Zhi-zheng,ZHANG Fenghuang.Installation Techniques of Steel-Truss Stiffening Girder for Mountain Suspension Bridges[J].Highway,2013(7):82-87.in Chinese)
[5]周昌栋,袁庆华,代明净,等.悬索桥锚碇基础强透水地层施工防渗技术[J].世界桥梁,2016,44(5):11-20.(ZHOU Chang-dong,YUAN Qing-hua,DAI Mingjing,et al.Seepage Prevention Techniques Used to Suspension Bridge Anchor Block Foundation Construction in Highly Permeable Stratum[J].World Bridges,2016,44(5):11-20.in Chinese)
[6]罗瑞华.武汉鹦鹉洲长江大桥主桥基础工程施工技术[J].桥梁建设,2014,44(5):9-14.(LUO Rui-hua.Construction Techniques for Foundation Works of Main Bridge of Yingwuzhou Changjiang River Bridge in Wuhan[J].Bridge Construction,2014,44(5):9-14.in Chinese)
[7]沈涛,刘一飞.武汉鹦鹉洲长江大桥南锚碇地下连续墙止水措施[J].桥梁建设,2013,43(6):111-116.(SHEN Tao,LIU Yi-fei.Water Stop Measures for Diaphragm Wall of South Anchorage of Yingwuzhou Changjiang River Bridge in Wuhan[J].Bridge Construction,2013,43(6):111-116.in Chinese)
[8]郝胜利,许国亮,纪晓壮,等.南京长江第四大桥北锚碇沉井不排水下沉施工关键技术[J].公路,2010(6):11-15.(HAO Sheng-li,XU Guo-liang,JI Xiao-zhuang,et al.Key Technologies of Undrained Sinking Construction of North Anchor Caisson of the 4th Changjiang River Bridge in Nanjing City[J].Highway,2010(6):11-15.in Chinese)
[9]李陆平,朱斌,罗瑞华.武汉杨泗港长江大桥主塔沉井硬塑黏土中下沉技术[J].桥梁建设,2018,48(4):1-5.(LI Lu-ping,ZHU Bin,LUO Rui-hua.Techniques of Sinking Open Caissons for Towers of Wuhan Yangsigang Changjiang River Bridge in Hard Plastic Clay[J].Bridge Construction,2018,48(4):1-5.in Chinese)
[10]沈斌.几种悬索桥锚碇结构基坑的施工风险分析及对策[J].公路交通科技,2008,25(4):108-112.(SHEN Bin.Construction Risks and Countermeasures of Some Different Kinds of Anchorage Pits of Suspension Bridge[J].Journal of Highway and Transportation Research and Development,2008,25(4):108-112.in Chinese)