澳门大桥钢桁箱梁吊装吊具选型及稳定性动力学分析

Selection and Stability Dynamics Analysis of Steel Truss-Box Girder Hoisting and Lifting Device for Macao Bridge

澳门大桥主桥中跨钢桁箱梁采用1000 t分离式桥面吊机分节段吊装,在首次利用单吊耳平衡梁吊具安装大体积、不规则、高重心、吊装难度最大的首节段SH5钢桁箱梁时发生倾覆事故,借助BIM技术进行稳定性动力学分析,得出是由于钢梁重心较高而吊点距钢梁重心太近导致重心失稳发生倾覆的原因,单吊耳平衡梁吊具不适用于高重心钢梁,通过对吊具重新选型,选用双吊耳平衡梁吊具(三角型吊具),并对吊装方案进行稳定性动力学分析,分析不同工况下SH5钢梁吊装稳定状态,最终与实际吊装结果进行比对,确定分析模拟结果与实际吊装结果基本一致,双吊耳平衡梁吊具可满足高重心钢梁吊装,为今后类似钢梁吊装提供一种借鉴方法。

The mid span steel truss-box girder of the main bridge of the Macao Bridge is lifted in sections using a 1000 t separated deck crane.During the installation of the first section SH5 steel truss-box girder with large volume,irregularity,high center of gravity,and the highest lifting difficulty using a single lifting ear balance beam lifting device for the first time,an overturning accident occurred.Using BIM technology for stability dynamics analysis,it was found that the reason for the instability and overturning of the center of gravity was due to the high center of gravity of the steel beam and the lifting point being too close to the center of gravity of the steel beam.The single lifting ear balance beam lifting device was not suitable for high center of gravity steel beams.Through the re-selection of lifting devices,a double lifting ear balance beam lifting device(triangular lifting device)was selected,and the stability dynamics analysis of the lifting scheme was carried out to analyze the stable state of SH5 steel beam lifting under different working conditions.Finally,compared with the actual hoisting results,it was confirmed that the simulated analysis results were basically consistent with the actual hoisting results,the double lifting ear balance beam lifting device can meet the lifting requirements of high center of gravity steel beams,providing a reference method for similar steel beam lifting in the future.