- 摘 要
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（1 北京維拓時代建筑設(shè)計股份有限公司， 北京 100025； 2 建研地基基礎(chǔ)工程有限責任公司， 北京 100013）
［摘要］某既改項目新增一層下沉廣場，下沉廣場四周均是既有建筑的地下室。經(jīng)過多方論證，采用逆作法施工下沉廣場能最大程度節(jié)省工期，提高業(yè)主周轉(zhuǎn)效率。介紹了該工程逆作法施工的設(shè)計及要點；重點描述了采用支護和擋墻一體設(shè)計的樁墻來代替地下連續(xù)墻作為基坑支護的設(shè)計做法以及采用鋼筋混凝土復(fù)合柱代替型鋼格構(gòu)柱的設(shè)計做法，此做法的施工難度低于傳統(tǒng)施工做法；并介紹了采用鋼管樁對原有結(jié)構(gòu)柱進行托換的技術(shù)。
［關(guān)鍵詞］逆作法； 支護擋墻一體； 柱托換； 灌注樁
中圖分類號：TU354文獻標識碼：A文章編號：1002-848X(2019)16-0055-04
Design and application of top-down construction method in a reconstructed underground square project
Li Hongqiu1, Xu Yue1, Wu Zengliang1, Li Qinrui2
(1 Beijing Victory Star Architectural & Civil Engineering Design Co., Ltd., Beijing 100025, China;2 Carb Foundation Engineering Co., Ltd., Beijing 100013, China)
Abstract:A reconstructed underground project was surrounded by the basement of the current buildings and a new layer of an underground square was added. After much argument and consultation, top-down construction method was used in order to reduce the period of construction and increase owner′s turnover ability. The key points of the top-down construction method used in the project were introduced. The design method of using dual-purpose pile wall for supporting and retaining wall to replace the underground diaphragm wall for foundation pit supporting was emphatically described. The design method of the reinforced concrete composite column was emphatically described to replace the steel lattice column. The construction difficulty of this method was lower than that of traditional construction method. The technology of using steel pipe piles to transfer the original structural columns was introduced.
Keywords:top-down construction method; dual-purpose pile wall; column transfer; bored pile
通訊作者：徐越，碩士，工程師，Email：xuyue@vtjz.com。
