广州塔南广场深基坑半逆作施工开挖关键技术

The Key Technology of Semi Top-Down Construction for Deep Excavation Engineering in Canton Tower South Square Plaza

常规逆作开挖需利用已施工的各层楼板作为结构的水平支撑,支模完成当层结构后才可继续往下暗挖,难以满足工期目标。本文以广州塔南广场项目为例,提出一种创新的深基坑半逆作施工技术,在确保结构及施工过程安全性的同时,可以无需分阶段开挖,提升出土效率,缩短工期,有效解决常规逆作施工中遇到的大型机械设备受净空限制无法进入,人防结构浇筑困难等问题,为日后类似工程提供经验参考。

The conventional top-down excavation needs to make use of the floor slabs which have been constructed as the horizontal support of the structure."Taking the South Tower Square project in Guangzhou as an example,this paper proposes an innovative semi-reverse construction technology for Deep Foundation Pit,which can ensure the safety of the structure and construction process,and improve the excavation efficiency without the need of stage excavation,shorten the construction period effectively solve the conventional reverse construction of large-scale mechanical equipment can not enter by clearance restrictions,civil air defense structure casting difficulties,and other problems for future similar projects to provide experience.