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李進(jìn)軍¹，  王衛(wèi)東¹，  顏洪²
（1  現(xiàn)代設(shè)計(jì)集團(tuán)華東建筑設(shè)計(jì)研究院有限公司，上海200002； 2南昌大學(xué)第二附屬醫(yī)院基建科，南昌330006）

[提要] 基于南昌大學(xué)第二附屬醫(yī)院醫(yī)療中心大樓逆作法工程的成功實(shí)踐，介紹了新型逆作法結(jié)構(gòu)型式在江西地區(qū)的首次應(yīng)用。本工程采用全逆作法總體設(shè)計(jì)思路，地上地下結(jié)構(gòu)同步施工，在地下二層逆作施工同時(shí)完成地上十層結(jié)構(gòu)的施工。采用結(jié)構(gòu)梁板替代臨時(shí)水平支撐、結(jié)構(gòu)豎向構(gòu)件框架柱與臨時(shí)立柱相結(jié)合的一柱一樁豎向支撐、圍護(hù)結(jié)構(gòu)采用臨時(shí)圍護(hù)體的逆作法結(jié)構(gòu)型式。工程實(shí)施監(jiān)測(cè)結(jié)果表明，地下結(jié)構(gòu)逆作施工對(duì)周邊環(huán)境影響較小，上部結(jié)構(gòu)沉降均勻穩(wěn)定。本工程新型逆作法設(shè)計(jì)取得了良好的社會(huì)和經(jīng)濟(jì)效益，為江西地區(qū)類似工程的設(shè)計(jì)提供了借鑒。
[關(guān)鍵詞] 新型逆作法；支護(hù)結(jié)構(gòu)與主體結(jié)構(gòu)相結(jié)合；結(jié)構(gòu)梁板替代支撐；一柱一樁；鋼筋混凝土環(huán)梁節(jié)點(diǎn)；型鋼混凝土變剛度轉(zhuǎn)換結(jié)構(gòu)

Practice and Design of New Top-down Method in the Project of Second Hospital of Nanchang Uruversity
Li Jinjun¹,  Wang Weidong¹, Yan Hong²
(1 East China Architectural Design & Research Institute Co. ,Ltd., Xian Dai Architectural Design Group, Shanghai 200002 China; 2 Second Affiliated Hospital of Nanchang University, Nanchang 330006, China)

Abstract: Basing on the successful application of the project of second affiliated hospital of Nanchang university, a new top-down design method was introduced on the base of success application in Jiangxi province firstly. The full top-down excavation method was used in the project, and ten floor structures were built at the process of excavation. The key design techniques of the new top-down method including:1)substituting level bracing system by basement slab; 2)combine the structure vertical supporting column with the temporary vertical shoring; 3)using the temporary fender cast-in place piles as exterior-protected construction in top-down excavation process etc. A series of new techniques, which including the profiled bar-concrete controlled bracing system substituting level bracing system by variable level basement roof slap, concrete ring beam on complex boundary condition, the top-down method of etc were first introduced and practiced in engineering originally. It is proved the new top-down method have a good economy effect and society effect. The method provides a new engineering design choice for the similar projects.
Keywords: new top-down method; substituting level bracing system by basement slab;foundation structure in deep excavation supported with substructure;  single column over single pile; concrete ring beam; profiled bar-concrete controlled bracing systeru