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昆山中宇国际大厦主楼为高204m的框筒混合结构超高层建筑,其一侧与3跨5层的裙房连为一体,采用钻孔灌注桩桩筏基础。在其基础设计中,采用变刚度调平的原理对桩筏进行优化设计,选择合理的布桩平面和筏板厚度,对主楼以及裙房和纯地下室的钻孔灌注桩的桩端持力层和桩长进行合理的配置,同时分析主楼灌注桩桩底后注浆的影响。为控制主楼与裙房的差异沉降,在主楼与裙房之间设置沉降后浇带。通过计算设置后浇带前后的差异沉降并加以对比分析,可以得出设置沉降后浇带能有效控制主楼自身及主楼与裙房的差异沉降的结论,由此改善了筏板的内力并降低了上部结构的次内力,从而减少了桩基础工程量与筏板材料消耗。
The main building of Kunshan Zhongyu International Mansion is a 204m high box-tube hybrid high-rise building with one side connected with a podium with 3 spans and 5 floors and a bored piled raft foundation. In its basic design, the principle of variable stiffness leveling is used to optimize the design of piled rafts. The reasonable piles plane and raft thickness are selected to optimize the pile-end bearing capacity of the main building and the bored piles in podium and pure basement And the pile length to carry on the reasonable disposition, at the same time analyzes the influence of the grouting after the pile foundation of the main building bored pile. In order to control the differential settlement between the main building and the podium, set the pouring tape between the main building and the podium. By calculating the differential settlement before and after post-pouring zone and comparing the results, it can be concluded that the pouring belt after settlement can effectively control the differential settlement between the main building and the main building and the podium, thereby improving the internal force of the raft and reducing The secondary internal forces of the superstructure reduce the amount of pile foundation work and raft material consumption.