隧道与既有高架桥相遇时高架桥桥墩托换技术

On Viaduct Pier Underpinning Technology When the Tunnels under Construction Meeting the Existing Viaducts

某市市政主干道建设过程中下穿高速公路处须修建3条车行隧道。隧道与既有高速公路高架桥桥墩相遇,须对既有6个高架桥墩基础进行结构托换。通过对其结构托换所涉及的技术问题,控制因素分析、结构处理,施工要求及监控等进行了系统的分析、介绍,以期为今后结构托换工程提供借鉴。

It is necessary to build 3 tunnels under the expressway during the main road construction process in a city. When the tunnels under construction meet the existing viaduct piers, these 6 existing piers should be underpinned. Through a systematic analysis of the underpinning technology on controlling factors, structural treatment, construction demand and monitoring, it can be a reference for future similar engineerings.