以某隧道横洞与正洞三岔口处的施工为例,在分析施工方案选择与细化的基础上,对横洞与正洞三岔口处的施工步骤、方法与工艺及施工要点进行了论述,实践证明该方案的实施安全、快速地完成横洞进正洞的施工,为隧道贯通打下坚实基础。 Taking the construction of a crossroad at the tunnel and Zhengduan Sanchakou as an example, based on the analysis of the selection and refinement of the construction scheme, the construction steps, methods and techniques as well as construction essentials at the crossing of the Hengdong and Zhengdong tunnels are discussed Practice has proved that the implementation of the program safely and quickly completed the construction of Yonsei Jinzhengdong and laid a solid foundation for the tunneling.