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为克服高温环境对于大跨度预应力连续刚构桥主跨合拢施工所造成的不利影响,本文依托赣江特大桥第七联中跨合拢工程,研究探讨了在高温环境下人工降温对于连续刚构桥合拢的影响,人工降温方法采用箱体内冰块降温与箱体外洒水降温相结合的方式,主跨合拢采用劲性骨架临时锁定。合龙过程中进行了温度、线形、应力的监控,通过对监控数据的分析表明,该桥梁主跨合龙的施工工艺是科学合理的,可以有效降低箱梁悬臂端温度,并且线形和应力均满足设计和规范的相关要求。
In order to overcome the adverse effect of high temperature environment on the construction of large span prestressed continuous rigid frame bridge main span, this paper, based on the seventh span mid-span confluence project of Ganjiang Super Large Bridge, studied the effect of artificial cooling on continuous rigid frame Bridge closed the impact of artificial cooling method using a combination of ice box cooling and cooling outside the box combined with the main span closed with a strong skeleton temporary lock. Through the analysis of the monitoring data, the construction process of the main span of the bridge is scientific and reasonable, which can effectively reduce the cantilever temperature of the box girder, and the line shape and the stress meet the design requirements And the specification of the relevant requirements.