单拱单柱双层浅埋暗挖地铁车站二次衬砌优化施工技术

北京地铁五号线蒲黄榆车站为22.6 m宽大跨度单拱单柱双层结构,采用中洞法开挖,开挖跨度相对较大,临时支护体系繁多,二次衬砌过程中结构受力转换复杂。文章主要介绍蒲黄榆车站二次衬砌施工分层、分段划分及临时支撑拆除代换技术。

Optimized techniques for fabricating the secondary lining of a two- storey shallow subway station with single arch and one row of columns excavated by mining method

Puhuangyu station on line No.5 of Beijing subway is of a two-storey single arch structure with one row of columns and a span of 22.6m which was constructed with the center cell excavated in advance.Owing to the comparatively large span and the complicated support system,the behavior of the secondary lining in the process of fabricating was rather complicated.The paper briefly introduces the techniques of fabricating the secondary lining by layers and sections with the temporary support removed and substituted properly in Puhuangyu station.