寒区预应力混凝土连续梁冬施温控技术研究

RESEARCH ON THE TEMPERATURE CONTROL TECHNOLOGY OF PRESTRESSED CONCRETE CONTINUOUS BEAM IN COLD REGION

针对严寒地区大型铁路桥梁的建设需求,文中进行了预应力混凝土连续梁冬季施工关键技术的研究。确定了从原材料、混凝土拌合与运输以及养护整个阶段的温度控制措施。其次,总结了连续梁承台、墩身以及悬浇连续梁的冬期施工方案。此实例的冬期施工温控措施,可为严寒地区类似预应力混凝土连续梁的冬期施工提供有益参考。

According to the constructionr equirements of large railway bridges in cold regions,this paper deploys the key construction techniques of prestressed concrete continuous beams in winter.The thermal control approaches are identified for the raw materials,mixturing and transportation of the concrete,and the whole stage of maintenance.Besides,this paper summarizes the construction scheme of continuous beam caps,piers,and cantilever casting continuous beams in winter.The presented method in this case can benefit the similar winter construction engineering of prestressed concrete continuous beams in cold regions.