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京张高铁的重点工程,新保安高架特大桥昨天(14日)顺利转体合龙。
京张高铁新保安高架特大桥位于河北省怀来县境内,全长15.05公里,由于桥梁跨越既有的京包双线铁路,施工过程中,为了保证既有线路的运输安全,施工人员分别在既有铁路两侧采用悬臂灌注法进行梁体浇筑,然后采用墩顶水平转体就位合龙。
新保安高架特大桥跨京包铁路连续梁转体施工,转体角度55°,转体段长度54m。两处连续梁作业要同时同步、转体的速度和转角也要相同,工作难度大,是国内时速350公里的高速铁路第一座采用墩顶转体的连续梁,也是第一座曲线转体的连续梁。
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