文保建筑群下方开发地下空间项目中的原位托换技术研究  

Research on In-situ Support Technology in Underground Space Development Projects under Cultural Preservation Buildings

作　　者：张弛 章谊 朱伟敏 ZHANG Chi;ZHANG Yi;ZHU Weimin(Shanghai Construction No.2 Construction Group Co.,Ltd.,Shanghai,200080,China)

机构地区：[1]上海建工二建集团有限公司,上海200080

出　　处：《工程建设（维泽科技）》2023年第11期41-46,共6页Engineering Construction

摘　　要：文中介绍了上海张园城市更新项目中,利用原位托换技术完成砌体结构的传统浅基础向临时静压锚杆桩基础转换,再通过与静压锚杆桩连接的托盘结构,实现静压锚杆桩与室内低净空钻孔灌注桩的永久桩基转换,并通过利用新型的“环梁节点”和“桩柱一体”的概念,实现文保建筑群原位托换,和原建筑下方地下空间的逆向开发。文中首先介绍了托换技术的整体流程。再结合整体流程,依次详细介绍各项专项工艺,包括上部预加固、托盘施工、低净空静压锚杆桩、低净空钻孔灌注桩、顶升与调平等。在既有建筑完成后,逆作实施地下空间结构的施工,尤其是新型的“桩柱一体”与“环梁节点”的设计与结构试验。In the Shanghai Zhangyuan urban renewal project,the traditional shallow foundation of masonry structures was transformed into a temporary static pressure anchor pile foundation using in-situ support technology.Then,a tray structure connected to the static pressure anchor pile was used to achieve the permanent pile foundation conversion between the static pressure anchor pile andthe indoor low clearance bored pile.By utilizing the new concepts of"ring beam nodes"and"pile column integration",the in-situ support of cultural preservation buildings was achieved,reverse development of underground space below the original building.The article first introduces the overall process of the replacement technology.Combined with the overall process,a detailed introduction will be given to various special processes,including upper pre reinforcement,tray construction,low clearance static pressure anchor piles,low clearance bored piles,and jacking and leveling.After the completion of the existing building,the construction of the underground spacestructure will be carried out in reverse,especially the design and structural testing of the new"pile column integration"and"ring beam node".

关 键 词：文保建筑群 托换 地下空间开发 托盘结构 

分 类 号：TU755.2[建筑科学—建筑技术科学]