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逐跨张拉施工方法,对于预应力混凝土连续箱梁具有施工标准化,工作周期化,最大程度地减少工费比例,降低造价;但对于桥长在1000m以上的桥梁,不免会有施工工期不足,作业面单一,多个工作组不能同时开展作业,不能充分发挥具有较强机械设备施工单位的技术水平。采用两跨张拉,从联端往中跨张拉,中跨锚固的设计理念不失为一种有效的方法。
The construction method of cross-span tensioning for continuous prestressed concrete box girder has the construction standardization and work cycle, minimizing the labor cost ratio and reducing the cost. However, for bridges with a bridge length of more than 1000m, there will be inefficient construction periods, A single work surface, a number of working groups can not be homework at the same time, can not give full play to the construction machinery with strong technical units. The use of two cross-tension, from the joint to the mid-span tension, mid-span anchoring design concept after all, is an effective method.