上海中心大厦桩基础变刚度调平设计
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姜文辉,巢斯 (同济大学建筑设计研究院(集团)有限公司,上海 200092)
[摘要]对于上海地区的超厚软弱土层,如何控制建筑沉降和差异沉降是设计的重点。变刚度调平设计是基于沉降控制的基础设计方法,对于群桩基础和软土地基的高层建筑沉降差异控制有显著的效果。介绍了上海中心大厦大直径后注浆钻孔灌注桩基础设计中按照变刚度调平概念,通过合理选择桩长和桩距,使得主楼底板中心和边缘的计算差异沉降控制在合理的范围,优化了底板的设计。经过试桩,认为后注浆的桩端注浆方法能有效提高单桩承载力和减小不同桩承载力间的变异值。[关键词]上海中心大厦;变刚度调平设计;超高层建筑;桩筏基础;差异沉降中图分类号:TU473文献标识码:A文章编号:1002-848X(2012)06-0132-03Variable rigidity design in the pile foundation of Shanghai TowerJiang Wenhui, Chao Si(Architecture Design & Research Institute of Tongji University, Shanghai 200092, China)Abstract: How to control the settlement and differential settlements of buildings in Shanghai is important. Variable rigidity design is based on the settlement control and is efficient in differential-settlement control of high-rise buildings with piles group and soft bed. Large-diameter post-grouting bored piles are adopted in the foundation of Shanghai Tower. The foundation of Shanghai Tower was designed according to the variable rigidity conception. By selecting length and distance of piles properly, the differential settlements of plate at centre and edges were controlled within the reasonable range, which can optimize the plate design. Pile tests show that post-grouting technique can increase the bearing capacity of the single pile as well as decrease differences among bearing capacities of different piles.Keywords: Shanghai Tower; variable rigidity design; super high-rise building; plie foundation; differential settlement作者简介:姜文辉,硕士,高级工程师,Email:whenjon@126.com.参考文献[1]张关林,石礼文. 金茂大厦 决策·设计·施工[M]. 北京:中国建筑工业出版社,2000.[2]龚剑,赵锡宏. 对101层上海环球金融中心桩筏基础性状的预测[J]. 岩土力学, 2007,28(8):1695-1699.[3]龚剑. 上海超高层及超大型建筑基础和基坑工程的研究与实践[D]. 上海:同济大学,2003.[4]陈传水,甘正常. 超长大直径钻孔灌注桩垂直承载力的试验研究[J]. 建筑结构,2001, 31(5):67-68.[5]周有希,卜艳萍. 超深超大直径钻孔灌注桩在特大型桥梁中的应用[J]. 西部探矿工程,2004, 11(2):2-3.[6]刘金砺. 桩基研究与应用若干进展浅析[J]. 施工技术,2000, 29(9):2-4.[7]盛黎麟,楼兰忠. 大直径钻孔灌注桩桩底后注浆施工及质量控制[J]. 建筑施工,2007,29(6):387-389.[8]李培彬,赵广鹏. 北京银泰中心塔楼桩基础设计[J]. 建筑结构,2007,37(11):16-19.