深圳市第三代指挥中心项目地上结构为六层连续大跨度钢桁架体系，建筑高度56 m，每层由六榀大跨度钢桁架+钢次梁组成，层高6.5~12 m不等，身处建筑密集城区，堆场道路等条件极其受限。对其安装方法进行比选，否定了整体提升、滑移安装等施工方法，最终采用施工快速、安全经济的单点式支撑体系原位安装钢桁架。通过对其结构形式、连接方式、端部节点构造的优化设计，达到快速安装拆卸的效果。每榀桁架在工厂制作时预起拱，现场安装时中间起拱值为60 mm，平面上由南向北采用分段进行原位安装，立面上采用以两层钢桁架为一个安装单元，与两侧结构形成双层框架体系后，再进行下层桁架支撑的卸载转运、楼板浇筑，完成本层楼板浇筑后再向上安装第三层桁架结构，按此顺序层层向上周转支撑体系进行桁架安装。利用有限元分析软件MIDAS提前对安装过程中的支撑体系受力和结构下挠变形进行施工模拟验算，在每榀桁架的中部和端部设置位移监测点，施工过程中做好监测记录。
The system of long-span steel truss is widely used in steel structure applications,it is commonly used as a single-story long-span steel truss system, and its installation method is relatively mature. However, there are few installation projects of multi-layer long-span steel truss structure system, and its installation technology needs further study.
The ground structure of the third-generation command center project in Shenzhen is a six-story continuous long-span steel truss system with a building height of 56 meters. Each floor is composed of six long-span steel trusses and steel beams, and the floor height is between 6. 5 meters and 12 meters. The project is located in a densely built urban area, and its storage yard and roads are very restricted. Through the comparison and selection of its installation methods, the construction methods of overall lifting and sliding installation were rejected, and the steel truss was installed at the corresponding position by a single-point support system with fast construction, safe and economical. By optimizing its structural form, the connection method and the top node, realizing the effect of quick installation and removal. The truss is arched during factory production, and the arching degree of the middle position is 60 mm during on-site installation. On the horizontal plane, the truss is installed in sections from south to north. On the elevation, a two-story steel truss is used as an installation unit. After the unit and the structure on both sides form a double-layer frame system, the lower truss support is unloaded and transported, and the floor is poured. After the floor is poured, the third floor of the truss structure is installed upwards, and the support system is turned up in this order for truss installation. Use MIDAS, which is a finite element analysis software, to simulate and check the force and structural deformation of the support system during the installation process in advance. Set deformation monitoring points at the middle and end of each truss, monitor and record it during the construction process.
The results of data comparison show that the simulated value is basically the same as the measured value; The successful application of this support system in the third-generation command center project in Shenzhen fully proves that this support system is fast, safe and economical in construction. The installation of the truss adopts a two-story steel truss as an installation unit. After the unit and the two sides of the structure form a double-layer frame system, the lower truss support is unloaded and transported. This method can effectively control the deviation during the construction of the structure.