建筑施工·第44卷·第12期2967深水入岩承台无封底双壁钢围堰施工技术研究李建明许哲辉庄壹广州市市政工程机械施工有限公司广东广州510060摘要:基于石门县梯云大桥8#主塔承台水文及地质情况,设计出一套深水入岩的无封底双壁钢围堰,通过MidasCivil软件模拟了施工过程中双壁钢围堰的受力情况,验证了双壁钢围堰的稳定性。总结出一套深水入岩的无封底双壁钢围堰施工技术,解决了低桩埋置式承台无法水下混凝土封底或水下混凝土封底困难的问题,为类似承台施工提供了参考。关键词:无封底双壁钢围堰;入岩承台;有限元分析;围堰拼装下放中图分类号:U443.16+2文献标志码:A文章编号:1004-1001(2022)12-2967-04DOI:10.14144/j.cnki.jzsg.2022.12.045ResearchonConstructionTechnologyofDoubleWallSteelCofferdamWithoutBottomSealingforDeep-waterEntering-rockCapLIJianmingXUZhehuiZHUANGYiGuangzhouMunicipalConstructionEngineeringMachineryCo.,Ltd.,Guangzhou,Guangdong,510060,ChinaAbstract:Basedonthehydrologicalandgeologicalconditionsofthecushioncapofthe8#maintowerofTiyunBridgeinShimenCounty,asetofdoublewallsteelcofferdamwithoutbottomsealingisdesignedfordeep-waterentering-rock.ThestressofthedoublewallsteelcofferdamduringconstructionissimulatedbyMidasCivilsoftware,andthestabilityofthedoublewallsteelcofferdamisverified.Asetofconstructiontechnologyofdoublewallsteelcofferdamwithoutbottomsealingfordeep-waterentering-rockissummarized,whichsolvestheproblemthatlowpileembeddedcapscannotbesealedbyunderwaterconcreteortheunderwaterconcreteisdifficulttoseal,andprovidesareferenceforsimilarcapconstruction.Keywords:doublewallsteelcofferdamwithoutbottomsealing;entering-rockcap;finiteelementanalysis;cofferdamassemblyandlowering况下的受力特征进行分析,提出一种入岩无封底双壁钢围堰施工技术。1双壁钢围堰结构设计及有限元分析1.1双壁钢围堰构造8#主塔承台双壁钢围堰尺寸设计为37.90m(长)×17.70m(宽),壁厚1.50m,如图1所示。3790017700图1双壁钢围堰结构平面示意围堰垂直方向共分为3节,第1节(含刃脚1.50m)高度为7.10m,第2节高度为5.60m,第3节高度为5.60m,总高度为18.30m。双壁钢围堰壁体内、外壁板采用厚10mm钢板,隔舱腹板采用厚12mm钢板,水平环板采用厚20mm钢板,竖向加...