绕城高速公路改扩建项目规划与设计的实例分析

Case Study on the Planning and Design of Reconstruction and Extension Project of Ring Expressway

通过分析绕城高速公路的功能、作用及规划设计原则,并以辽宁沈阳某绕城高速公路的改扩建为例,对其具体规划和设计进行了分析。根据该绕城高速公路的功能定位,扩建按照全立交、全封闭的高速公路标准进行。全线按路基全宽41 m,八车道进行扩建。设计速度从原来的121 km/h调整为102 km/h。在绕城高速的建设过程当中有很大一部分的建设是对道路进行加宽,加宽主要是对称的,通过设置一部分的支挡结构来减少对于道路的拆迁的数量,主要的目的还是为了能够实现双对称的加宽。当遇到特殊的路段的时候可以考虑单侧的加宽。原路面以加铺为主,处理原路面的病害,按照路线纵断,对其高差进行设计,找平层后铺设≥5 cm,加铺沥青玛蹄脂碎石3.2 cm。新增互通立交3处,全线增设服务区,在改扩建后,全线共有120条道路可通行机动车。

Based on the analysis of the function , the function and the princidesign , this paper makes an analysis of the planning and design of the expressway oing. According to the functional positioning of the Beltway,expansion change ,fully closed highway standards. According to the full width of the roadbed 41m , eight Lane ex-pansion. The design speed is adjusted from 121 km/h to 102 km/h. Most of the road sections of Beltway are symmetrically widened,and the number of local road sections can be reduced by setting theretaining structure or adjusting the roadbed slope. For individual special sections , the use 〇 o line or uni-lateral widening. In the original pavement paving , processing of the original pavement , in accordancewith the route longitudinal section , the design elevation , the leveling layer after laying more than 5 cmasphalt mastic macadam 3. 2 cm. New Interchange 3 , the whole line of additicoal service area,after theexpansion , a total of 120 road traffic vehicles.