Considering the special geographical location and geological conditions of the comprehensive transportation hub project of Beijing Sub-Center Railway Station,covered top-down excavation was performed during the construction of underground structures.Firstly,the construction method for underground structural engineering was described.Key and difficult points of covered top-down excavation was analyzed based on engineering conditions and a reasonable and efficient construction sequence was determined for covered top-down excavation.Secondly,earthwork excavation,foundation pit dewatering and foundation pit monitoring involved in covered top-down excavation were improved for higher engineering efficiency and safety.Additionally,foundation construction with tower cranes were improved by using a steel pipe pile type concrete pedestal as a tower crane foundation.Finally,BIM and AR technologies were applied based on covered top-down excavation to advance the development of covered top-down excavation engineering.
关键词
盖挖逆作/副中心枢纽工程/塔式起重机基础施工
Key words
covered top-down excavation/sub-center hub engineering/tower crane foundation construction
维普
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