山区高速公路沿线桥梁的总体规划及选型

百色至靖西高速公路是一条典型山区高速公路,具有桥隧比例高、地形地质复杂等特点,为在该线路上合理地布设桥梁,首先确定单工点桥梁的基本原则,再对布设桥梁遇到的一些特殊情况,如路线跨越较薄山脊的情况、地质条件好的"V"形山谷是否设桥、岩溶不良地质条件下桥跨选择、斜桥的布置以及同一施工标段内桥跨的统一等情况,充分综合分析了桥梁前、后的路线整体条件来布设桥梁,这样布设桥梁不仅确保了桥梁的结构安全性、满足行车舒适性的要求、也达到了施工便利、降低工程造价的目的。

Overall Planning and Type Selection of Bridges for a Mountainous Region Expressway

The Baise-Jingxi Expressway is a typical mountainous region expressway characterized by the high ratio of bridges and tunnels and complex topography and geology.To rationally lay out the bridges on the expressway,the basic principle of layout of a single bridge is firstly determined and then some special situations that may be encountered in the layout of all other bridges,such as if the bridges are to be laid out or not on the route sections crossing the thin mountain ridge and at the V valleys with good geologic conditions,the selection of bridge spans at places with poor karst geological conditions,the layout of skew bridges and the unifying of the bridge spans in the same construction contract section,are studied and in the layout of the bridges,the overall road conditions in front and in rear of the bridges are thoroughly and comprehensively analyzed.The layout of bridges on the expressway in the ways as mentioned not only ensures the structural safety of the bridges and meets the riding comfort requirements,but also achieves the purposes of convenient construction and reducing of construction cost.