大跨度全焊非对称断面钢桁梁桥整体吊装方案

摘要

随着钢引桥跨度的不断增大,为了减小钢桥自重、节省投资,采用非对称断面钢桁梁桥结构型式.非对称断面钢桁梁桥由于设置悬臂侧而成为偏心结构,吊装时需合理设置吊点位置.本文从设计角度提出了一种新的吊点布置方法——将吊点布置于横梁处,并针对新方案进行空间结构计算,在保证钢桥结构安全的前提下,为施工提供不同的吊装选择.%With the increment of span of steel bridge approach, steel truss bridge with asymmetric section is adopted to reduce the dead weight and cost of steel bridge. The steel truss bridge with asymmetric section becomes eccentric structure because it is set at the side of cantilever. The suspending points need to be set appropriately. A new layout of suspending points is proposed from the design aspect, i.e. the arrangement of suspending points on cross beam. The new plan is checked by calculating space structure. Different options may be applied in the lift and assembly operation subject to the structural safety of steel bridge.