中庭多跨悬挑钢桁架逆作施工技术分析

ANALYSIS OF ATRIUM MULTI-SPAN CANTILEVERED STEEL TRUSS REVERSE CONSTRUCTION TECHNOLOGY

大型场馆的桁架体系极具复杂性,而中庭区域采用大跨度悬挑钢结构是在工程项目中应用较为广泛的一项技术。本工程区别常规方法对悬挑桁架进行分段,采用胎架及高空散装法,更合理地对悬挑结构进行逆作施工,先把悬挑桁架补全为通跨桁架,改变结构受力体系,采用液压同步整体提升方式进行安装,最后再进行拆除卸载变换体系。选择了更为安全、高效的安装方案。

The structural system of large venues is extremely complex,and the use of long-span cantilever steel structure in the atrium area is a widely used technology in engineering projects.This project is different from the conventional method of segmenting the cantilever truss,using the tire frame+high-altitude bulk method,but it is more reasonable to reverse the construction of the cantilever structure,first complete the cantilever truss into a cross-span truss,change the structural stress system,use hydraulic synchronous overall lifting for installation,and finally dismantle and unload,and transform the system.The choice of a safer and more efficient installation scheme.