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Old 05-19-2011, 10:27 AM   #1
sunyanzi05
 
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Default 中交一公局四公司兰渝铁路嘉陵江特大桥89#单壁钢围堰

12月13日,中交一公局四公司兰渝铁路一分部嘉陵江特大桥89#墩单壁钢围堰下沉完毕。
嘉陵江特大桥水中墩数量多,水文、水情复杂,河床覆盖层薄厚不均,河床高低不平、起伏较大,地 质情况复杂。
不管是单壁还是双壁钢围堰均适用于水深较深,有较高的强度、刚度和稳定性,能够适用于各种地质情况,但对于 大的漂石及卵砾石地层则宜采用先开挖方式,以降低围堰下沉过程中的难度和费用,Cast Alnico,因此钢套箱围堰越来越广泛地应用于各种大型深水桥梁的基础施工。
89#墩位水深为8.27m,选择采用单壁钢围堰,采用先拆除钻孔钢平台开挖河床,后下沉钢围堰。目前围堰已下沉到位,仞脚外侧回填到位,围堰内开挖和平整到位,准备浇注封底混凝 土。这标志着嘉陵江特大桥水中连续梁取得突破性进展。
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