排桩+内支撑体系中的拆换撑受力分析及变形研究  

Stress Analysis and Deformation Research of Dismantlement,Replacement and Supporting of Inner Support System with Row of Piles

作　　者：叶文启 

机构地区：[1]同济大学土木工程学院,上海200092 [2]中天建设集团有限公司,上海201102

出　　处：《建筑施工》2015年第6期750-752,共3页Building Construction

摘　　要：在中骏广场项目施工中,为保证基坑东北角位置的2栋单体建筑提前封顶并交付使用,并有效控制自身基坑周围土体变形,采用了自北向南、自东向西的开挖和支撑步骤进行施工。其中,东北侧角撑可独自受力,拆换撑可提前进行,能够确保2栋单体建筑工期的大幅度提前。以有限元数值计算和现场实测数据进行对比,分析了挖土、设立混凝土内支撑和斜抛撑以及最后拆撑阶段的基坑变形情况,在确保工程安全的前提下实现了工期的要求。In the project of Zhongjun Plaza construction, in order to ensure two individual buildings on the northeast of the foundation pit being completed in advance and be put into service, as well as to control the surrounding soil deformation of the foundation pit efficiently, the construction procedures from north to south and from east to west for the excavation and supporting system have been conducted properly. The northeast angle brace can bear the stress alone, so as to start the construction of dismantlement, replacement and supporting in advance and to ensure the two individual buildings completed sharply ahead of time. By comparing the finite element numerical calculation and the measured data, by analyzing the deformation change of excavation, by setting-up the interior concrete bracing and the inclined bracing and finally by dismantling the temporary shoring system, the whole construction has met the requirements of the construction period on the premise of ensuring the engineering safety.

关 键 词：基坑工程 混凝土内支撑 钢管斜抛撑 数值计算 变形控制 

分 类 号：TU753.3[建筑科学—建筑技术科学]