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为了深入研究高速公路超高路段的排水问题,以大广高速衡大段为工程依托,对高速公路超高路段横坡的排水设计、中央分隔带排水设计、路面结构排水设计及排水设施的尺寸进行了研究。研究结果表明为了增加排水效果,需在超高路段的单幅路面上设置路拱横坡。超高路段路面外侧排水设施采用路缘带边缘设置纵向矩形排水沟,采用缘石预留过水口方案,并在其上加铺盖板提高运营安全性。在超高段路面结构中设置矩形纵向盲沟,实现将面层与基层之间的渗水排入纵向排水沟,有效的排除了层间积水。水力计算确定了路侧矩形沟的结构尺寸及不同车道数、不同管类型的横向排水管布设间距。
In order to deeply study the drainage problem of expressway ultra-high road section, based on the large section of Daguang High-speed Highway, the design of drainage system, the design of drainage system of central divider zone, the drainage design of drainage system and the size of drainage facilities of superhighway section of expressway Were studied. The results show that in order to increase the drainage effect, it is necessary to set the arch slope on a single pavement of the ultra-high road section. The drainage facilities outside the pavement of the ultra-high section adopt the edge of the curb edge to set the longitudinal rectangular drainage ditches, adopt the plan of the sewer to reserve the water outlet, and add the cover plate to improve the operation safety. In the ultra-high section of the pavement structure, a rectangular longitudinal blind groove is provided, so that the seepage water between the surface layer and the grass-roots level can be drained into the vertical drainage gutter so as to effectively eliminate the stagnant water in the layer. Hydraulic calculation to determine the side of the rectangular groove structure size and the number of different lanes, different types of horizontal drainage pipe spacing.