Integral lifting construction method for large-span net rack roof structure: Fid-Bau Portal

Integral lifting construction method for large-span net rack roof structure

YANG YESONG / LIU JIAKUAN / CAI DONGYI / LI HONGLI

The invention discloses an integral lifting construction method for a large-span net rack roof structure, and belongs to the technical field of roof structure construction. The method comprises the following steps: 1, a scheme is drawn up; 2, Midas/Gen finite element analysis software is applied to carry out construction simulation analysis of a lifting stage and construction simulation analysis of a whole region lifting stage on each lifting region; 3, roof grid structure splicing is conducted according to the construction scheme determined in the step 2; 4, a lifting platform and a lifting hanging point are arranged in each lifting area; 5, the steel strand is tensioned to enable the steel strand to be uniformly stressed; 6, the synchronous lifting net rack roof structure is loaded in agraded mode to the position away from the designed elevation by 100-200 mm; and 7, the hydraulic lifting system is unloaded step by step, after the load is transferred to the supporting stand columnson the two sides, the lifting equipment and the temporary reinforcing structure are dismantled, and overall lifting of the structure is completed. The net rack roof structure is integrally lifted after being spliced in a segmented mode, the construction speed is high, and safety and reliability are achieved.

本发明公开了一种大跨度网架屋盖结构整体提升施工方法，属于屋盖结构施工技术领域。本发明的步骤为：步骤1：拟定方案；步骤2：应用Midas/Gen有限元分析软件分别对各个提升区域进行提升阶段的施工模拟分析以及整个区域提升阶段的施工模拟分析；步骤3：根据步骤2的确定的施工方案进行屋盖网架结构拼装；步骤4：在各个提升区域设置提升平台和提升吊点；步骤5：张拉钢绞线使其均匀受力；步骤6：分级加载同步提升网架屋盖结构至距设计标高100‑200mm处；步骤7：进行液压提升系统逐级卸载，将荷载转移至两侧支承立柱上后，拆除提升设备和临时加固结构，完成结构整体提升。本发明采用网架屋盖结构分段拼装后整体提升，施工速率高，安全可靠。

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