凹形竖曲线路段防眩板高度计算方法

Calculation method of anti-glare plate height on concave vertical curve section

分析了平直路段和凹形竖曲线路段眩光、驾驶人视线与防眩板高度的关系,考虑凹形竖曲线路段半径、汽车前照灯高度、驾驶人视线高度、路段横断面结构和中央分隔带宽度等参数,提出了凹形竖曲线路段防眩板高度计算方法。以京化高速公路防眩板设计高度为例进行实例验证,并将计算结果与《公路交通安全设施设计细则》(JTG/T D81—2006)规定的计算结果进行对比。研究结果表明:当汽车前照灯的灯距为120m,凹形竖曲线路段半径在12 000～32 000m时,按照现有规范,防眩板设计高度为1.712m,按照提出的方法,防眩板最小设计高度为1.720m,防眩板最大设计高度为1.800m。

The relationships among glare,driver sight and anti-glare plate height on straight section and concave vertical curve section were analyzed.The parameters such as the radius of concave vertical curve section,car headlamp height,driver sight height,cross-section structure and medial divider width were considered,and the calculation method of anti-glare plate height on concave vertical curve section was put out.The design height of anti-glare plate on Jinghua Expressway was taken as a case,the example verification was carried out,and the calculation results of the proposed method and Guidelines for Design of Highway Safety Facilities(JTG/T D81—2006) were compared.Research result shows that when the lamp distance of car headlamp is 120 m and the radius of concave vertical curve section is 12 000-32 000 m,the design height of anti-glare plate is 1.712 m by using the existing specification.By using the proposed method,the minimum design height of anti-glare plate is 1.720 m and the maximum design height of anti-glare plate is 1.800 m.