跨大型铁路编组站钢-混组合梁斜拉桥体设计

Overall Design of Steel-Concrete Composite Girder Cable-Stayed Bridge across Large Railway Marshalling Station

郑州郑北大桥为桥跨布置(221+221) m的独塔双索面结合梁斜拉桥,桥面宽度为43. 0 m。该桥上跨郑州北铁路编组站,主梁采用双箱形钢主纵梁和预制混凝土桥面板共同受力的结合梁,剪力键为圆柱头焊钉。桥塔采用H形结构,塔柱为单箱单室箱形截面。桥塔设有72根斜拉索,按双索面扇形布置,斜拉索在主梁和桥塔的锚固分别采用锚拉板式构造和钢锚箱构造。斜拉索采用平行钢丝拉索,双层共挤HDPE护套,护套表面设抗风雨振功能的双螺旋线。主梁采用多点顶推施工方案,采用钢导梁和扣索塔架辅助顶推作业。

Zhengbei Bridge in Zhengzhou is a composite girder cable -stayed bridge with the span of 221 ＋221 m and the deck width is 43.0 m. The bridge crosses Zhengzhoubei railway marshalling station. The main girder consists of double steel box section longitudinal beams and concrete deck slab. The shear key is cylinder wielding stud. The bridge has a H shaped main tower. The tower columns are single-box and single-room section. The tower has 72 stay cables, arranged as double cable plane sector. The anchors of the stay cables at the main girder are of tension plate ones. The anchors of the stay cables at the main tower are of steel anchored box. Parallel steel wires are adopted for the stay cables, double-deck shales HDPE sheath. Double helix wires with function of against wind and rain are installed on the surface of sheath. The main steel girder is constructed by the way of the incremental launching construction. Steel launching nose and cable tower are used to help incremental launching construction.