勐古怒江特大桥总体设计
2019-11-11袁少洋汪磊马健夏支贤
袁少洋 汪磊 马健 夏支贤



摘要:结合受控因素,勐古怒江特大桥主桥采用240m双塔空间扇形双索面分离式钢箱梁斜拉桥结构。索塔为钻石型箱型截面混凝土结构;主梁采用分离式钢箱梁结构。斜拉索采用镀锌平行钢丝成品索,设置减震器以抑制斜拉索振动;采用索塔端直接锚固于塔内混凝土齿块、梁端钢锚拉板与边腹板焊接的锚固形式。引桥采用40m标准跨径钢板组合梁,能有效加快施工速度和控制地震响应,促进钢结构在西南山区桥梁工程中的应用。
Abstract: Combining with the controlled factor, the main bridge of Menggu Nujiang River Grand Bridge adopts the structure of double tower and space fan of double cables with separated steel box stay cable bridge with 240m-main span. The cable tower is diamond shaped concrete structurer with box shaped cross section. The beam adopts separative steel box beam structure. The stay cable of bridge uses galvanized parallel steel wire finished cable, installing shock absorber to decrease vibration. The tower end of the stay cable is straightly anchored in the concrete teeth of the tower.The beam end of stay cables applies steel anchor plate welded with outer web. The approach bridge adopts steel plate composite beam of 40m standard span, which will speed up construction process and control seismic response, as soon as prompt application of steel structure in bridge construction of southwest mountains areas.
关键词:勐古怒江特大桥;斜拉桥;分离式钢箱梁;混凝土锚固齿块;钢板组合梁
Key words: Menggu Nujiang River Grand Bridge;stay cable bridge;separative steel box beam;concrete anchored teeth;steel plate composite beam
中图分类号:U442.5 文献标识码:A 文章编号:1006-4311(2019)29-0200-04
1 項目概况
勐古怒江特大桥是国家高速公路网G5613保山至泸水高速公路跨越怒江的关键性控制工程。大桥整体呈南北走向,在保山市和怒江州分界处跨越怒江,南岸为保山市隆阳区芒宽乡,北岸为怒江州泸水县上江镇。包括本桥在内的保山至泸水高速公路建设成为怒江州脱贫开发建设的便捷运输通道,对完善国家和滇西片区路网结构,改变当地贫困落后面貌,积极响应国家加强“三区三州”等深度贫困地区基础设施建设的号召,打赢滇西边境集中连片特困地区脱贫攻坚战等具有重要意义。
勐古怒江特大桥路线总长1333m,由主桥和引桥组成,其中主桥长440m。结合受控因素以及地形、地貌、地质、水文等因素,主桥采用主跨240m双塔对称分离式钢箱梁斜拉桥方案,斜拉索空间双索面扇形布置,跨径组合为(100+240+100)m,两岸边跨均位于岸区,边中跨比为0.417;经结构受力计算分析,边跨未设置辅助墩,主桥立面布置见图1。……
