青藏高原多年冻土区钻孔扩底桩施工方法浅析

Analysis on construction method of boring and expanding bottom pile in permafrost region in Qinghai-Tibet plateau

结合青藏铁路长江源特大桥的施工,介绍了在青藏高原上钻孔扩底桩的施工方法,探讨了扩孔钻头的工作原理,通过对钻孔桩混凝土的热工计算确定了不同工况条件下经济、易行的水下混凝土灌注施工工艺,为类似工程提供了参考。

Combined with construction work of Changjiangyuan super large bridge in Qinghai-Tibet railway the construction method of boring and expanding bottom pile in permafrost region is introduced. The working principle of expanding bit is discussed. Through heat engineering calculation of concrete of bored pile economic and convenient construction technology is determined in order to provide references for similar works.