2016年9月上第45卷第17期
D01: 10. 7672/sgjs2016170001
施工技术
CONSTRUCTION TECHNOLOGY
腾讯（北京）总部大楼大悬挑钢结构有支撑悬伸
推进法施工技术周进兵，张宝燕，郭福元
（中建三局第一建设工程有限责任公司，潮北
北武汉
430048）
【摘要】腾讯（北京）总部大楼巨型桁架分布于建筑外围，合围呈180m×180m正方形，巨型悬挑桁架在切角部位合龙，3处悬挑，最大悬挑达81m。根据工程特点进行施工方案比选，选择有支撑悬伸推进法施工方案。采用有支撑悬伸推进法、施工顺序相关性控制、施工荷载影响、合龙温度、临时支撑顶部水平力消除、大悬挑空间结构同步分级卸载及施工监测等技术解决以下同题：提高周转率，减少临时支撑用量；减小预调值计算量，使计算结果施工指导性强；结构合龙温度确定；提高临时支撑承载力，减小临时支撑截面；保证结构卸载的安全性；保证预调值实施和结构应力控制。
【关键调】钢结构；大悬挑钢结构；有支撑悬伸推进法；有限元分析；施工技术
【中图分类号】TU391
【文献标识码]A
[文章编号】1002-8498(2016)17-0001-04
ConstructionTechnologybyOverhangingMarchingMethodwith
PartialSupportsforLargeCantileverSteelStructure
of Tencent(Beijing)Headquarters Building
Zhou Jinbing, Zhang Baoyan, Guo Fuyuan
(China Construction Third Bureau First Engineering Co. ,Lid. , Wuhan,Hubei430048, China)
Abstract: Large cantilever steel structure truss of Tencent( Beijing) Headquarters Building is distributed in the outside, which is square with 180m x 180m. There are three cantilevers. The largest cantilever span is 81m. According to engineering characteristics of the structure, three construction schemes are put forward. The construction scheme with partial supports is determined after comparative analysis. The construction technologies are used, such as overhanging marching method with partial supports, the construction sequence correlation control, construction load effects, closure temperature, elimination of the horizontal force at the top of support, synchronous overall graded unloading and construction monitoring. The following problems are solved, such as reducing the number of supports, pre-set value calculation, deterrmining closure temperature, the bearing capacity of temporary support, unloading, the pre-set value implementation and structure stress control.
Key words: steel structures; large cantilever steel structures; overhanging marching method with partial supports; finite element analysis ;construction
引言 0
大型复杂结构设计与施工，促进了高性能钢材和CAE技术在建筑行业中的应用。同时，针对大悬挑结构的施工工艺也有了长足发展，归纳为两大类：①无支撑悬伸施工法；②满堂支撑施工法。第1
·中建三局科技研发课题（CSCEC3B-2016-5）
【作者简介】周进兵，项目经理，高级工程师，E-mail；320049@ qq.com
【收稿日期】2016-06-28 万方数据
1
类代表工程如中央电视台新台址，两塔楼向内双向倾斜6°，顶部通过“L”形大悬臂结构相连，悬挑长度达75m，大悬臂自身高度约56m，离地高度约162m。第2类代表工程如深圳证券交易所营运中心，四周悬挑，最大悬挑36m，离地高度约36m。
腾讯（北京）总部大楼巨型桁架分布于建筑外
围，呈180m×180m正方形，悬挑巨型桁架在切角部位合龙，3处悬挑，最大悬挑81m，切角端部离地高