1、 本科生毕业设计说明书 题 目:陕西安康市平利至镇坪公路八 道河桥 空腹式箱形拱桥 毕业设计说明书 I 摘要摘要 拟建桥位于平利县八道乡罗家院子以南约 800m处,介于平镇三级公路(平利段) K30+356K30+450 之间,跨越八道河河谷,路线与水流方向正交。桥址区位于基岩底 山区小型河流的迂回曲折段,河谷两岸为山梁斜坡,左岸基岩外露,右岸突出的山梁 上分部厚度不大的第四系覆盖层,谷底较平坦。 桥址区属构造条件较简单的地段,无破怪性断裂存在,桥位处无不良地质现象。 根据地形以及所给资料设计了三个比选方案:方案一是预应力混凝土简支 T 形梁 桥,孔径布置:240m,桥梁总长 80m;方案二为
2、三跨等截面连续 T 形梁桥,孔径布置 25m+30m+25m,总长 80m;方案三为上承式混凝土箱形拱桥,主跨 65 米,两测加一跨 6 米跨径板,孔径布置:6+72+6m,总长 84m。 方案比选依据安全、实用、美观的原则,最终选择方案三上承式混凝土箱形拱桥为 推荐方案,拱上建筑采用梁板柱式腹孔,主梁采用标准跨径 6m的实心板,板厚 0.3m。 拱轴系数通过试算采用 1.167。 桥梁下部结构为重力式桥墩、 桥台为 U 形桥台。 本设计对盖梁、 立柱及主拱圈配筋, 对主拱圈、桥墩及基底进行了强度验算。 关键词关键词:拱桥;实心板;盖梁;立柱;桥墩 毕业设计说明书 II Abstract Th
3、e proposed bridge is located in Lee County, 8 Heung Ping Luo yard about 800m south of Division, between Pingjhen 3 Road (Ping Lee paragraph) K30 +356- K30 +450 between badaohe valley across the road and the flow direction is pay. The end of the bridge site located bedrock mountain - a small section
4、of the river twists and turns, valleys cross the ridge slopes, left bank of the bedrock exposed, prominent ridge on the right bank of the thickness segment of the Quaternary small, relatively flat bottom. Structural conditions of the bridge site belonged to a simpler site, without breaking blame of faults, the bridge is located no bad geological phenomena. According to information designed for terrain and the comparison of three programs: the program first, simply supported prestressed