超大深基坑工程中间桩柱施工技术探讨

Discussion on Construction Technology for Intermediate Piles and Columns of Extra-large Deep Foundation Pits

中间桩柱施工技术是盖挖法的关键,尤其是超大深基坑盖挖逆作施工中,中间桩柱施工对结构的安全稳定性至关重要,结合天津站交通枢纽工程盖挖逆作法中间桩柱的施工,对超深钻孔灌注桩施工、钢管柱及混凝土施工、桩柱隆沉等关键技术进行了简要阐述,并就该技术的发展及研究方向进行了探讨。

The construction technology for the intermediate piles and columns has great importance for the cut-and-cover construction. It is particularly the case for the cut-and-cover top-down construction of extra-large deep foundation pits, where the construction of the intermediate piles and columns has fundamental importance for the safety and stability of the structures. Taking the construction of the intermediate piles and columns in the cut-and-cover top-down construction of the transportation hub works of Tianjin Railway Station as example, the author expatiates on the construction of the extra-deep borehole cast piles, the construction of the steel pipe columns and concrete works and the settlement control of the piles and columns and discusses the development and research trend of the described technology in the paper.