以太中银铁路工程赵家庄1号隧道沟谷地段明洞施工为例,结合施工现场实际情况,将原设计明洞施工变更为明洞暗作施工,开挖后先用型钢进行初期支护,支护完成后立即进行拱顶回填和防排水施工,二次衬砌适当延后。实践证明,该方案有效确保了工程质量和安全,缩短了工程工期,并降低工程造价。 Taking the construction of Myeongdong in the tunnel section of Zhaojiazhuang No. 1 tunnel of the Central Bank of China Railway as an example, the design of the original design of Myeongdong was changed to the construction of the underground works in Myeong-dong based on the actual situation at the construction site. After the excavation, the initial support was made with the section steel and the support was completed Immediately after the vault backfill and drainage construction, secondary lining appropriate delay. Practice has proved that the program effectively ensure the quality and safety of the project, shorten the construction period, and reduce project costs.