建筑施工·第45卷·第1期121分仓注浆减阻方式在长距离顶管中的应用梁志坚杨瀛广州市第三市政工程有限公司广东广州510060摘要：某电力管廊工程采用顶管施工，最大顶进长度达445m，如何降低顶力是实现无中继间一次顶进的关键。为减少摩阻力以降低顶力，在管节上增加钢筋环，加大管节与土体之间的间隙，形成厚泥浆套以降低摩阻力，并形成分区注浆机构，储蓄泥浆，保证减阻效果。分析顶进过程顶力、摩阻力及注浆压力的变化规律，得出结论：监测计算得出的最大顶力低于目标控制顶力，并相对理论总顶力降低了约33.42%；摩阻力大幅降低，使得大管径顶管在不采用中继间的情况下实现超长距离一次顶进；泥浆套厚度的增大需增加注浆效率和压力；增大注浆压力后，地面无冒浆和隆起现象，且周边沉降符合设计要求。关键词：长距离顶管；分仓注浆减阻；摩阻力；无中继间；一次顶进中图分类号：TU99文献标志码：A文章编号：1004-1001(2023)01-0121-04DOI：10.14144/j.cnki.jzsg.2023.01.032ApplicationoftheResistanceReductionMethodbyGroutinginSeparateSilosinLongDistancePipeJackingLIANGZhijianYANGYingGuangzhouNo.3MunicipalEngineeringGroupCo.,Ltd.,Guangzhou510060,Guangdong,ChinaAbstract:Apowerpipegalleryprojectadoptspipejackingconstruction,andthemaximumjackinglengthis445m.Howtoreducethejackingforceisthekeytorealizeonejackingwithoutrelayroom.Inordertoreducethefrictiontoreducethejackingforce,addareinforcementringonthepipejoint,increasethegapbetweenthepipejointandthesoil,formathickslurrysleevetoreducethefriction,andformazonedgroutingmechanismtostoreslurrytoensuretheeffectofdragreduction.Byanalyzingthevariationlawofjackingforce,frictionforceandgroutingpressureduringjacking,itisconcludedthatthemaximumjackingforceobtainedfrommonitoringcalculationislowerthanthetargetcontroljackingforce,andtherelativetheoreticaltotaljackingforceisreducedbyabout33.42%;Thefrictionforceisgreatlyreduced,sothatthepipejackingwithlargediametercanrealizetheultralongdistancejackingatonetimewithouttheuseofrelay;Thegroutingefficiencyandpressureshallbeincreasedwiththeincreaseoftheslurryjacketthickness.Afterthegroutingpressureisincreased,thegroundwillbefreeofgroutinganduplift,andthesurrounding...
