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（1 華森建筑與工程設(shè)計顧問有限公司南京分公司， 南京 210005；2 中國建筑設(shè)計研究院， 北京 100044）

［摘要］南京青奧中心超高層雙塔樓的3層地下室采用全逆作施工。采用大直徑杯口形擴(kuò)頂鉆孔灌注樁實現(xiàn)了塔樓外框架鋼管柱與樁基的可靠連接，保證了荷載的可靠傳遞，同時針對鋼柱和工程樁提出了嚴(yán)格的垂直度和水平誤差控制要求。由于超高層塔樓傳給基礎(chǔ)的荷載很大，C60超緩凝高強(qiáng)度混凝土和后注漿技術(shù)的采用有效地提高了工程樁的承載力，使工程樁能在滿足逆作法施工階段的承載力要求的同時又滿足建成后承擔(dān)全樓荷載的承載力要求。

［關(guān)鍵詞］逆作法; 大直徑杯口形擴(kuò)頂樁; C60超緩凝混凝土; 后注漿技術(shù); 垂直度控制

中圖分類號：TU473.1+2      文獻(xiàn)標(biāo)識碼：A      文章編號：1002-848X(2014)01-0058-03

Pile foundation design of top-down construction basement of super-high-rise twin towers of Nanjing Youth Olympic Center

Dong Hexun1, Liu Wenting2,  Ren Qingying2,  Zhang Liangping1,  Zhao Subei1

(1 Nanjing Branch of Huasen Architectural & Engineering Designing Consultants Ltd., Nanjing 210005, China; 2 China Architecture Design & Research Group, Beijing 100044, China)

Abstract: The top-down construction method was used in the three-storey basement of super high-rise twin towers of Nanjing Youth Olympic Center. To achieve the safe transfer of loads and reliable connection of the column and pile, the cup-shaped large-diameter bored piles were originally used in this project. At the same time, the requirements of verticality control and levelness control were strictly proposed for the steel column and the pile. For the huge gravity loads of the super high-rise building transferred to the foundation, C60 super retarding high strength concrete and the post grouting technology were used. Bearing capacity of pile foundation was significantly improved by the above two methods, and the piles can meet the capacity of top-down construction stage and undertake all floors loads after the completion of the towers.

Keywords: Top-down construction method; cup-shaped large-diameter bored pile; C60 super retarding high strength concrete; post grouting technology; verticality control

作者簡介：董賀勛，碩士，一級注冊結(jié)構(gòu)工程師，Email:donghex1@163.com。

參考文獻(xiàn)

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［2］GB 50007—2011 建筑地基基礎(chǔ)設(shè)計規(guī)范［S］.北京：中國建筑工業(yè)出版社，2011.

［3］DB32/T 291—1999 樁承載力自平衡測試技術(shù)規(guī)程［S］.南京：江蘇省技術(shù)監(jiān)督局、江蘇省建設(shè)委員會，1999.

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［5］GB 50205—2001 鋼結(jié)構(gòu)施工質(zhì)量驗收規(guī)范［S］. 北京：中國建筑工業(yè)出版社，2001.