盾构隧道穿越已施工风井工程风险分析及应对措施讨论

Analysis and Discussion on Engineering Risk and Countermeasures for Shield Tunnel Passing through Completed Air Shaft

结合长沙地铁3号线阜埔河站一灵官渡站区间工裎,“先隧后站”即先施工完成区间隧道的穿越,后施工车站主体或区间风井基坑及主体结构。“先隧后站”工法可以减小地铁区间竖井盾构吊装的场地需求,避免车站与盾构交叉作业,减少盾构停机等待时间,合理安排工筹,优化资源配置。目前“先隧后站”工法已在全国地铁建设中有多处成功的应用。

Combined with Changsha Metro Line 3 Fubuhe Station一Lingguandu Station Project,this paper introduces the construction method of“tunnel first and station later”,that is firstly to complete the passing through of the interval tunnel,and then to construct the station body or the interval air shaft foundation pit and main structure.The“tunnel first and station later”construction method can decrease the field demand of shaft shield hoisting in the metro section,avoid the cross-construction of station and shield,reduce the waiting time of shield downtime,reasonably arrange the work preparation and optimize the allocation of resources.At present,the construction method of"tunnel first and station later"has successfully applied in many metro constructions of the whole country.