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广东省南澳大桥主墩超长大直径变径钻孔灌注桩施工采用了回转钻机成孔及海上拌和船浇筑水下混凝土的施工工艺,针对海上超长大直径变径钻孔灌注桩的施工难点及要点,文章阐述了该项工艺的技术要点及工程实施情况。
The construction technology of the large-diameter-reduced-diameter bored cast-in-situ piles for the main pier of Nan’ao Bridge in Guangdong Province was adopted. The construction process of the underwater drilling rig and the sea-mixing vessel for pouring underwater concrete were adopted. In view of the difficulties in construction of the extra long and large diameter bored piles And points, the article describes the technical aspects of the technology and project implementation.