托换技术在高架桥改建中的应用

Application of Underpinning Technology in Viaduct Reconstruction

在高架桥施工中,经常会遇到新建项目与老高架桥现有结构冲突的情况。为合理解决该冲突问题,以宁波某项目为例,介绍了采用托换技术拆除原有墩柱并改为大跨度盖梁结构的改建方法。经实践,该项技术可在保持老桥上部桥跨结构不变的情况下,达到为新建项目让路的目的。

In the construction of viaduct,conflicts between the new project and the existing structure of the old viaduct are often encountered.In order to solve the conflict reasonably,taking a project in Ningbo as an example,this paper introduces the reconstruction method of demolishing the original pier column with underpinning technology and changing it into a large-span bent cap structure.The practice shows that this technology can make a way for the new project while keeping the upper span structure of the old bridge unchanged.