方小军  向雄伟 （中国联合工程公司  杭州　310006）

[提要]  结合某高层建筑上部结构及桩筏基础的改造设计，对不同设计方案进行了比较分析，提出用加大截面法对框架柱进行加固，用悬挂的方法来满足在建筑物四周增加面积的要求，同时论述了大直径钢管静压锚杆桩在桩筏基础改造中的应用，可供类似工程参考。
[关键词]  改造  悬挂结构  植筋  桩筏基础  钢管静压锚杆桩

Combined with an actual project design of rehabilitation and adding area of a high-rise building, several different schemes are compared and analyzed. Based on the analysis, the problems of rehabilitation and adding area for the building are resolved through strengthening columns and suspended structure. The application of big-diameter tubular steel anchor pile in the reformation of piled raft foundation is also discussed.
Keywords: tall building; rehabilitation; suspended structure; injection anchor; piled raft foundation; tubular steel anchor pile

    参  考  文  献
1．混凝土结构加固技术规范(CECS 25:90)．
2．建筑桩基技术规范（JGJ94-94）．
3．高层建筑箱形与筏形基础技术规范（JGJ6-99）．
4．HIT．固定技术手册．1993．
5．胡庆昌．低周反复荷载作用下钢筋混凝土框架梁柱节点核芯区受剪承载力的试验研究．见：钢筋混凝土结构研究报告集，1978．