杭州萧山国际机场三期工程陆侧交通中心基坑逆作法设计

Reverse construction method design of landside traffic center foundation pit ofⅢproject of Hangzhou Xiaoshan International Airport

陆侧交通中心是联系杭州萧山国际机场T1~T4各航站楼的中转站,是杭州萧山国际机场三期工程的核心部分。为满足杭州萧山国际机场工程建设要求及东侧使用中航站楼“不停航、不停运”要求,陆侧交通中心东侧C区采用逆作施工,为目前浙江省内规模最大、开挖深度最深的采用逆作法的基坑工程。根据本工程的工程概况和环境特点,对本项目基坑逆作法设计的重难点进行了分析。从逆作法剖面设计、楼层板设计、栈桥设计和节点设计4个方面对本工程的逆作法设计中面临的主要问题进行了梳理和总结,并对相应问题所采取的措施进行了介绍。最终的工程实施效果及监测数据表明,整个逆作施工过程安全可控,基坑开挖对周边环境影响在合理范围内。

Landside traffic center is a transfer station connecting T1~T4 terminals of Hangzhou Xiaoshan International Airport and the core part of phaseⅢproject of Hangzhou Xiaoshan International Airport.In order to meet the construction requirements of Hangzhou Xiaoshan International Airport project and the requirements of"non-stop navigation and non-stop operation"of terminal building in service on the east side,the reverse construction was adopted in area C on the east side of the landside traffic center,which is the foundation pit project with the largest scale and deepest excavation depth of using the reverse construction in Zhejiang Province.According to the project overview and environmental characteristics of the project,the key and difficult points of the reverse construction method design of the foundation pit of the project were analyzed.The main problems in the reverse construction design of this project were sorted out and summarized from the four aspects of the reverse construction section design,floor slab design,trestle design and node design,and the corresponding measures were introduced.The final project implementation effect and monitoring data show that the whole reverse construction process is safe and controllable,and the impact of foundation pit excavation on the surrounding environment is within a reasonable range.