受机场净空限制互通式立交方案研究——以宁波九龙大道互通式立交方案为例

随着经济发展，机动车保有量不断增加，既有道路等级与规模逐渐不能满足需求。在主干路升级为快速路的过程中，往往需要平交口改立交或进行既有立交扩容改造。受限于现状道路以及周边地块，改建方案往往与常规立交方案大不相同。选取条件较为特殊的宁波九龙大道—北环节点，综合考虑机场限高、用地及建设时序等影响，探讨立交改建方案，提出独特的地下匝道方案，为其他立交改建工程提供参考。

Research on Interchange Schemes Subject to Airport Clearance Restrictions in Ningbo

With the development of the economy, the number of motor vehicles is constantly increasing, and the level and scale of the existing roads are gradually unable to meet the demand. In the process of upgrading main roads to expressways, it is often necessary to upgrade the grade crossings to overpasses or expand and reconstruct the existing overpasses. Due to the limitations of the current road and surrounding land, the reconstruction scheme is often significantly different from the conventional interchange scheme. Taking the node of Jiulong Avenue - North Ring Road in Ningbo with relatively special conditions as an example, the impacts of airport height limit, land use and construction sequence are comprehensively considered. The reconstruction scheme of overpass is discussed. A relatively rare underground ramp scheme is proposed. The references are provided for the other interchange reconstruction projects.