考虑差异沉降的互通式立交桥改扩建设计探讨

Discussions on Interchange Bridge Reconstruction and Expansion Design Considering the Differential Settlement

高速公路立交桥改扩建工程设计必须考虑新旧桥梁的不均匀沉降问题,文章以一地质情况复杂的立交桥改扩建工程为研究对象,根据改扩建设计原则确定了新旧桥基的不均匀沉降差控制指标,并根据不同地质条件计算出不同桩长的工后沉降量,提出了相应的桥梁拓宽设计方案。

The reconstruction and expansion project design of expressway interchanges must consider the uneven subsidence problem of old and new bridges,and with the reconstruction and expansion project of an interchange under complicated geological conditions as the object,this article determined the uneven settlement difference control targets of old and new bridge foundation in accordance with the reconstruction and expansion design principles,calculated the post-construction settlement amount of different pile length according to different geological conditions,and proposed the corresponding bridge widening design programs.