摘要
郑州新建农业路快速通道立交工程的立交桥上跨郑州北编组站,为减小立交桥施工对既有铁路的影响,考虑安全可靠性、工期可控性、技术可行性及经济合理性等方面,采用顶推施工方案。经孔跨布置和桥式方案比选研究,推荐主桥采用(126+200+126)m双塔斜拉桥方案。主梁为整幅钢箱梁,梁高3.5m,梁总宽50.84m,桥面布置双向10车道;桥塔采用H形混凝土塔,桥面以上塔高50m,塔柱为矩形空心截面,纵、横向宽度分别为5m、4m,壁厚1.2m;桥塔基础采用151.5m钻孔桩基础;斜拉索采用双索面平行拉索,梁上索距9m,塔上索距3.5m。采用MIDAS软件进行桥梁静力计算,计算结果表明,结构各项指标满足规范要求,桥式方案合理。
The interchange project on the Nongye Road corridor in Zhengzhou crosses the north rail marshalling yard in Zhengzhou City.To mitigate the influence of the construction of the interchange on the existing railways,the incremental launching method was chosen,taking into account a number of factors,including the safety and reliability of the project,the controllability of construction schedule,technical feasibility and economic reasonability.Based on the scheme comparison and selection of the span arrangement and bridge types,it is recommended that the main bridge adopts the scheme of a two-pylon cable-stayed bridge with span arrangement of（126＋200＋126）m.The main girder is composed of the integrated steel box girders measuring 3.5m in depth and 50.84 m in total width,needing to accommodate ten lanes of traffic,five lanes in each direction.The pylons are H-shaped concrete pylons,rising 50 m high above the bridge deck.The pylon columns have hollow rectangular cross section measuring 5 m in the longitudinal direction and 4m in the transverse direction,with a wall thickness of 1.2m.The foundation of the pylon is formed of 15 bored piles each with a diameter of 1.5m.The stay cables are arranged in parallel and in two cable planes,spaced at 9m on the girder and 3.5m on the pylon.MIDAS software was employed to do static force calculation of the bridge.The results of the calculation indicate that all the structural indexes meet the code requirements,and the bridge type selected is rational.
出处
《世界桥梁》
北大核心
2016年第2期7-11,共5页
World Bridges
关键词
跨线桥
斜拉桥
钢箱梁
顶推施工
方案比选
桥梁设计
overpass
cable-stayed bridge
steel box girder
incremental launching construction
scheme comparison and selection
bridge design
