长河坝水电站枫林沟大桥大孔径灌注桩特殊施工

On special construction of large-diameter bored piles at Fenlingou Bridge at Changhe Dam Hydropower Station

结合长河坝水电站枫林沟大桥工程概况,确定对2号墩桩基采用上部无水地带人工挖孔后下设15 m长钢护筒、下部富水地带机械成孔相结合的施工方法,并对人工挖孔、机械成孔造孔工艺、清孔、混凝土灌注等施工技术进行了介绍,对类似地层钻孔灌注桩的施工具有重要的参考意义。

Combining with the engineering survey of Fenglingou Bridge at Changhe Dam Hydropower Station, the paper identifies the construction methods combining with 15 m steel tube after the artificial excavation at upper waterless places and mechanic holing at lower water-rich places, and introduces some construction techniques, including manual excavation, mechanic holing craft, hole clearance, and concrete bored pile, so it is meaningful for the construction of bored pile with similar stratum.