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随着城市的不断发展,大型立交桥层数越来越多,一般的空心板梁、小箱梁、T梁、钢-混凝土组合梁建筑高度较高,会使整座立交桥桥面高度增大,不利于桥梁结构稳定且不经济。然而预弯预应力混凝土组合梁在同样的荷载作用下,可以把梁截面设计得很小,高跨比一般可达1/25~1/35,能满足桥梁上下层间的净空要求。文中结合跨径18m,梁高0.65m,预制长度17.8m的预弯梁施工,介绍预弯梁预制施工工艺。
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组合梁桥是指采用剪力连接件将抗拉性能好的钢材构件与抗压性能好的钢筋混凝土结构结合成组合截面工作的一种复合式结构。近年来,随着组合梁技术的不断发展,其使用范围已扩展到连续梁桥、拱桥和斜拉桥等多种复杂体系。组合梁中的钢梁部分也由早先单一的钢板梁拓宽到钢箱梁、钢槽梁和钢桁梁,组合梁的截面形式也由工字形发展到箱型、倒梯形甚至三角形[1]。当主梁截面采用多根单梁组成多箱室截面时,不同的截面形式造成单梁之间横向联系方式和混凝土桥面板施工方法大不相同。本文研究同等跨径 ...
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