某过江隧道深基坑工程重要管线保护施工技术

Many existing pipeline may be encountered in cut-and-cover city tunnel constructions, temporary relocation method is usually adopted for foundation pit construction, but in river-crossing tunnel project, the Jiang-bei large open-cut excavation engineering encountered a large main power supply line, which is almost impossible to be relocated. In order to protect the city power supply pipeline and insure the smooth construction of foundation pit engineering, this paper introduces in detail the overall protection principle and method, and in situ conservation construction technical measures and matters of attention in the construction. The successful engineering practice indicates that the in-situ-protection pit excavation technology is safe, economic and feasible, and can provide some experience and reference for other similar pipeline protection projects.