【作者】 梁志荣； 黄开勇； 刘静德； 魏祥；

【Author】 LIANG Zhirong;HUANG Kaiyong;LIU Jingde;WEI Xiang;Shanghai Shen Yuan Geotechnical Engineering Co., Ltd.;

【机构】 上海申元岩土工程有限公司；

【摘要】 上海市历史博物馆建设项目紧邻两栋历史保护建筑,地下室东、西两侧连通道分别延伸进入两栋历史保护建筑下方。针对项目周边历史建筑保护等级高、变形要求严的特点,综合项目施工场地狭小、建筑内部空间有限等因素,设计采用锚杆静压桩对历史保护建筑副楼进行基础托换加固,基坑采用MJS工法桩套打钻孔灌注桩+两道水平支撑的支护形式。第一道内支撑采用混凝土支撑,结合支撑布置施工栈桥,第二道内支撑采用钢支撑轴力伺服系统。数值计算结果表明,基础托换加固对基坑围护结构及历史保护建筑的变形控制效果显著。分阶段的监测数据表明,通过采取微扰动施工的围护结构,以及主动变形控制支撑体系,既保证了场地条件极度受限条件下基坑工程的施工,又满足了周边历史保护建筑变形控制要求,确保了项目的顺利实施,社会、经济、环境效益显著。本项目基坑工程的成功实践及历史保护建筑沉降全过程监测数据,可为今后类似项目提供参考。更多还原

【Abstract】 The construction project of Shanghai History Museum is adjacent to two protected historic buildings, which are underlain by passageways on the east and west sides of the basement. In response to the high protection level and strict deformation requirements of the historic buildings, and taking into account factors such as the narrow construction site and limited internal space of the buildings, anchor static pressure piles were designed to reinforce the foundation of the vice building. MJS piles, bored piles and two-layer horizontal struts were adopted as supporting structures.Construction trestles were arranged in combination with the first layer concrete struts, while axial force servo system was utilized in the second layer steel struts. The numerical calculation results indicate that the foundation underpinning reinforcement significantly improves the deformation control of both the excavation retaining structures and the protected historic buildings. The monitoring data of each stage shows that by using the micro disturbance construction retaining structures and the active deformation control struts system, the construction of excavation engineering with extremely limited site was ensured, while the deformation control requirements of surrounding protected historic buildings were also met. The project was successfully completed, and significant social, economic and environmental benefits were achieved. The successful practice of excavation engineering in this project and the settlement monitoring data of the entire process of protected historic buildings may provide references for similar projects in future.更多还原