大跨度超宽变截面不平衡配重连续梁转体施工控制

Rotation Construction Control of Large-span and Super-wide and Variable Cross-section Continuous Girder with Unbalanced Counterweight

结合工程实例,介绍了大跨度超宽变截面箱形连续梁转体施工的工艺、方法和保证措施,通过理论推导计算出转体施工中的索引力、转体速度、转体时间和惯性制动距离,并结合称重试验实测数据,对该类桥梁转体进行不平衡配重。

Based on engineering example,this paper introduces rotation method and assurance measures of large-span and super-wide and variable cross-section continuous girder,some construction parameters are calculated by theoretical derivation including cable gravitation,rotation velocity,rotation time and inertia braking distance. Combined with measured data of weighing test,the unbalanced counterweight of this kind of bridge rotation is achieved.