大断面平顶直墙地铁风道二衬施工受力转换技术

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,针对某地铁车站风道双层段的工程实践,分析大断面平顶直墙结构施工时的关键技术环节,如中洞法开挖、受力转换、分块模筑等.结果表明,关键工序合理,切实可行,施工过程中通过受力转换确保了原初期支护结构的稳定和安全,施工过程中严格监测控制,使风道二次衬砌质量得到保证,加快了衬砌施工进度,对整个风道工期控制起到了积极作用.

Secondary-lining Construction of Large Cross-section Box-type Ventilation Duct of Metro

In the construction of the large section box-type ventilation duct of metro with two storeys and double spans,there are many construction features involving large-span excavation,such as complex temporary support system,complicated force transfer for secondary structure and so on.Taking the successful practice of No.1 ventilation duct of Shiliuzhuang road subway station as an example,the paper analyses and summarizes several key technologies such as center heading excavation,force transfer,construction by p...