城市快速路建设中现状跨线桥的处理方案研究

Solution for Overpass Bridge in the Construction of Urban Expressways

城市干路提升为快速路时,由于道路设计标准的提高,现状跨线桥的桥位、标高、纵坡等一般均不能满足设计要求,如何科学处理服役性能良好的现状跨线桥是工程研究中的关键。以鄞县大道跨线桥为例,从用地范围、交通功能、社会影响及工程投资等方面综合比选了“老桥拆除新建”“老桥保留避让”“老桥顶升利用”3个方案。确定的“老桥顶升利用”方案功能完善、投资适中,并可有效降低碳排放,为类似工程提供了设计思路。

Due to the improvement of road design standards,the location,elevation,longitudinal slope,etc.of the current overpass bridge are difficult to meet the design requirements,when urban main roads are upgraded to expressways.How to scientifically handle the current overpass bridges with good service performance is the key in engineering research.Taking the overpass bridge of Yinxian Avenue as an example,three schemes were comprehensively compared from the aspects of land use scope,traffic function,social impact,and engineering investment,including"Build new bridge after dismantling","Preserve and avoid old bridge","Utilize old bridge after jacking".The determined plan-"Utilize old bridge after jacking"has complete functions,moderate investment,and can effectively reduce carbon emissions,providing a design idea for similar projects.