大悬挑钢结构无支撑高空原位安装施工技术  

Unsupported Overhead In-Situ Installation Technology for Large Cantilever Steel Structure

作　　者：马建 叶创 夏文才 Jian Ma;Chuang Ye;Wencai Xia(Wuhan Construction Engineering Co.,Ltd.,Wuhan 430024,China)

机构地区：[1]武汉建工集团股份有限公司,武汉430024

出　　处：《钢结构（中英文）》2021年第4期26-31,共6页Steel Construction（Chinese & English）

摘　　要：以光谷科技大厦裙楼大悬挑钢结构安装施工为例,介绍了无支撑高空原位安装施工技术在悬挑钢结构安装中的应用。由于该项目悬挑钢结构的安装需待裙楼非悬挑区域安装完成后实施,届时现场施工场地狭小,且提升点设置困难,无法进行地面拼装和整体提升施工;另外,悬挑结构安装位置较高,设置安装用临时支撑架成本较高,且支撑架本身稳定性难以确保。因此采用无支撑高空原位安装施工方法,分析及利用悬挑结构自身受力特点,借助临时拉杆辅助超重构件定位及稳定,并采用有限元软件对吊装过程中的内力及变形进行模拟,制定先主后辅、由内而外的构件吊装顺序,逐步形成悬挑结构自身受力体系,完成大悬挑钢结构安装施工,确保了施工安全,节约了成本。同时对施工过程中的质量控制及监测、工序衔接、施工安全保障进行了阐述。悬挑钢结构安装精度满足设计及规范要求,方案的科学性及安全性在具体施工中得到验证。Based on the installation for the large cantilever steel structure of Podiums in Wuhan Optics Valley Science and Technology Mansion,The paper introduced the application of the unsupported overhead in-situ installation technology in the installation of cantilever steel structure.The installation of cantilever steel structure in this project need to be implemented after the completion of installation of non cantilever structure in podiums.At that time,the narrow construction site and difficultly of lifting points setting cannot meet the assembling on the ground and integral lifting.In addition,the high-position of installation of cantilever structure caused high-cost to set temporary support frame and the stability of support frame cannot be ensured.In concrete construction,using without support overhead in-situ installation technology,analyzing and utilizing stress characteristics of cantilever steel structure,assisting location and stability of super heavy components by means of temporary pull rod and imitating the internal force and deformation in hoisting process by means of finite element software,according to the principle materials first and then auxiliary materials and inside-out lifting sequence making the scientific lifting sequence and forming the own stress system of cantilever structure step by step.The installation of cantilever steel structure in this project ensure construction security and economize the cost.Also,quality control and monitor,arrangement of construction procedures and security measures were discussed in the paper.The accuracy of cantilever steel structure after completion meet the design and standard requirements,the scientific nature and security of programme were verified in concrete construction.

关 键 词：大悬挑钢结构 原位拼装 吊装 无支撑 

分 类 号：TU758.11[建筑科学—建筑技术科学] TU974