软土地区超高层全逆作法工程实践
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严开涛1，万怡秀1，吴昭华1，张莉华1，孙芬2，陈燕1，王辉1（1 北京富力城房地产开发有限公司， 北京 100022;2 北京天鸿圆方建筑设计有限责任公司， 北京 100062）［摘要］结合工程实际情况，天津富润中心地下室采用全逆作法方案，基坑支护采用地连墙（两墙合一）+结构楼板水平支撑两者结合，保证基坑安全，加快进度，节省支护成本。采用ETABS软件分析楼板的支撑刚度，指导基坑设计，同时对西侧汽车坡道、北侧人防楼梯及沉降后浇带进行处理，以满足水平支撑的要求。提出壁桩方案及其设计方法，满足逆作法的需要。采用后叠合方案解决地下工程施工偏差较大的问题，采用预埋钢筋、预埋钢筋接驳器、焊接钢牛腿等措施解决水平构件与竖向构件连接节点问题。东侧因场地限制采用柱压地连墙的方案，使用十字钢板接头和压顶大梁解决地连墙接头抗剪承载力较弱和整体受力的问题。［关键词］超高层建筑； 全逆作法； 壁桩； 柱压地连墙中图分类号：TU471+8文献标识码：A文章编号：1002848X(2013)11005005Engineering practice of topdown construction method for super highrise buildings in softsoil areaYan Kaitao1, Wan Yixiu1, Wu Zhaohua1, Zhang Lihua1, Sun Fen2, Chen Yan1, Wang Hui1 (1 Beijing R&F Properties Development Co., Ltd., Beijing 100022, China；2 Beijing Tianhong Yuanfang Architectural Design Co., Ltd., Beijing 100062, China)Abstract:Based on practical engineering，topdown construction method was adopted in the basement of Tianjin R&F Center. Dualpurpose diaphragm wall and structural floor（as horizontal struts） were used for the foundation pit. The combination can ensure the safety of foundation pit，accelerate the construction progress，reduce the foundation pit cost. ETABS software was used to analyze the brace stiffness of structural floor to direct foundation pit design，and corresponding measures were adopted for west car ramp, north civil air stair and postpouring strip to satisfy stiffness requirements of horizontal struts. Barrettes were used to meet the needs for topdown construction method. Postcomposite scheme was used to solve the construction deviation of structure members. Preembedded steel bar, pre\|embedded steel connector and welded steel bracket were used to joints of horizontal and vertical structure members. East four columns of the office tower were laid on continuous concrete wall to break through the space limitation，cruciform plates and top beam were used to enhance the shearing capacity of the joints of the continuous concrete wall.Keywords:high-rise building; topdown construction method; barrette; continuous concrete wall supported column作者简介：严开涛，硕士，一级注册结构工程师，注册土木工程师（岩土），Email: yankaitao@sina.com。参考文献［1］JGJ 120—2012 建筑基坑支护技术规程［S］. 北京：中国建筑工业出版社，2012.［2］LEI GUO HUI. Barrette foundations［M］. Beijing: Science Press, 2006.［3］李桂花，周生华，周纪煜，等. 地下连续墙垂直承载力试验研究［J］. 同济大学学报：自然科学版，1993，21（4）：575580.［4］JGJ 94—2008建筑桩基技术规范［S］. 北京：中国建筑工业出版社，2008.［5］吴昭华，孙芬，邹安宇，等. 天津富润中心超高层结构设计［J］. 建筑结构，2013，43(11)：42\|49,18.［6］刘国彬，王卫东. 基坑工程手册［M］. 2版. 北京: 中国建筑工业出版社，2009.
