盾构上叠隧道下穿高架桥施工技术研究

Research on Construction Technology of Shield Overlay Tunnels Undercrossing Viaducts

文章针对地铁区间隧道盾构下穿既有高架桥施工及桥改隧工程交叠施工难题,通过建立数值模型分析了施工工序的合理性,利用新建桥墩桩基托换解决了高架桥的受力稳定性问题,辅助施工过程监测保证了施工的安全性。施工效果表明,数值模拟的定性分析为该工程的施工方案提供了指导意见,桩基托换等技术将市政隧道基坑工程施工引起的影响控制在了设计要求范围内。

Aiming at the overlapping construction problems of subway interval tunnel shield undercrossing the existing viaduct and bridge-to-tunnel engineering,the rationality of the construction procedures is analyzed by establishing a numerical model,the stress stability of the viaduct is solved by using the newly-built pier pile foundation underpinning,and the safety of the construction is guaranteed by the auxiliary construction process monitoring.The construction effect shows that the qualitative analysis of numerical simulation provides guidance for the engineering construction scheme;pile foundation underpinning and other technologies control the impact caused by the municipal tunnel foundation pit construction within the design requirements.