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大断面双层双跨平顶直墙暗挖地铁风道施工时具有开挖跨度相对较大,临时支护体系繁多,二次结构受力转换复杂的特点,针对北京地铁4号线石榴庄路站1#风道双层段的工程实践,分析总结大断面双层双跨平顶直墙结构中洞法开挖、受力转换、分块模筑等施工的几个关键技术环节,经实践检验,方案是合理的,可行的。
Large cross-section double-storey double-decked flat-topped straight wall undercutting subway duct construction with excavation span is relatively large, a large number of temporary support system, the secondary structure of the force conversion complex features for Beijing Metro Line 4 Gorgonzhuang Road Station 1 # wind tunnel double-layer engineering practice to analyze and summarize the large section of double-decked double-deck flat-topped straight wall structure in the tunnel method of excavation, force conversion, block construction and other construction of several key technical aspects, the practice Test, the program is reasonable and feasible.