2022·12·BuildingConstruction3010逆作法“一柱三桩”托换梁受力机理研究邓亮1,2龙莉波1,2谷雪影3于亚磊1,2章谊1,2富秋实1,21.上海建工二建集团有限公司上海200080；2.上海建筑工程逆作法工程技术研究中心上海200080；3.上海城建职业学院上海200080摘要：为研究“一柱三桩”新型竖向支撑体系中托换梁的力学行为，选取B0和B1层的托换梁的上下皮钢筋进行了自动化实时监测。监测结果表明：上下同步逆作施工过程中托换梁结构均处于安全状态；托换梁下方土方开挖工序和格构柱割除工序对托换梁影响较大，其余施工工况对托换梁影响较小；逆作法基坑施工过程中，托换结构整个断面均处于受压状态，现有设计将其直接简化为简支梁计算是偏于保守的。关键词：逆作法；一柱三桩；托换梁；实时监测中图分类号：TU753文献标志码：A文章编号：1004-1001(2022)12-3010-04DOI：10.14144/j.cnki.jzsg.2022.12.056StudyonMechanicalMechanismofUnderpinningBeamwith"OneColumnandThreePiles"ByReverseConstructionMethodDENGLiang1,2LONGLibo1,2GUXueying3YUYalei1,2ZHANGYi1,2FUQiushi1,21.ShanghaiConstructionNo.2(Group)Co.,Ltd.,Shanghai200080,China;2.ShanghaiEngineeringResearchCenterofTop-DownMethodinConstructionEngineering,Shanghai200080,China;3.ShanghaiUrbanConstructionVocationalCollege,Shanghai200080,ChinaAbstract:Tostudythemechanicalbehaviorofunderpinningbeamsinthenewverticalbracingsystemof"onecolumnandthreepiles",theupperandlowersteelbarsoftheunderpinningbeamsinfloorsB0andB1areselectedforautomaticreal-timemonitoring.Themonitoringresultsshowthattheunderpinningbeamstructureisinasafestateintheprocessofsynchronousreverseconstructionfromtoptobottom;theearthworkexcavationprocessandlatticecolumnremovalprocessundertheunderpinningbeamhaveagreaterimpactontheunderpinningbeam,whileotherconstructionconditionshaveasmallerimpactontheunderpinningbeam;thewholesectionoftheunderpinningstructureisunderpressureduringthefoundationpitconstructionwithreverseconstructionmethodanditisconservativetodirectlysimplifyittosimplysupportedbeamintheexistingdesign.Keywords:reverseconstructionmethod;onecolumnwiththreepiles;underpinningbeam;realtimemonitoring有待进一步研究。本文结合案例，对“...
