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污水提升泵站压密注浆工程专项施工方案

污水提升泵站压密注浆施工方案

污水提升泵站压密注浆主要针对其基坑底板下部的约1.8m厚的粉土，因其底板呈阶梯部，部份土体滑动，造成部份底板与其下部粉土的分离，而形成空洞，目前通过现场勘察，因破坏处为16×3×1.8m。因而要求采用注浆方式进行土体加固。Thisplanismainlyaimedatabout1.8mTHKpowdersoilinthebottomslaboffoundationpit.Asthebottomslabisinastepandpartofthesoilisslided,someslabsareseparatedfromthepowdersoil.Sothehollowsturnup.Afterthesiteinvestigation,asthebrokenareais16*3*1.8m,methodofgroutingshouldbeadoptedforthesoilstrengthening.

压密注浆方法MethodologyforCompactionandGrouting

甘家口电站正式施工组织设计施工淮备ConstructionPreparation

设置制浆站、加浆站尽量减少移动次数。Establishthemortarprocessstationandaddingstationtominimizethetimesofremoval.

备料、搭建水泥存放点。Materialpreparation.Andbuildthestorageforcement.

施工计划ConstructionPlan

施工设备：水泥浆压力泵一台；泥浆搅拌桶一台；储浆桶一只；注浆杆一根；注浆管50m。ConstructionEquipments:Onecementmortarpressurepump.Onebucketforcementmortarmixing.Onebucketforstorage.Onepoleformortarfillingand50mconduit.

施工技术要求ConstructionTechnicalRequirements

1、技术要求：TechnicalRequirements

因施工地块现已浇注混凝土底板，固采用风镐进行人工开孔，孔距为2.0m~1.5m，呈梅花形布孔，这样有利于浆液充填。Asthesitehasbeenplacedwithconcrete,holeswillbemadebymanpowerwithairpick.Theseholeswillbeinaplumblossomshape,withclearanceof2.0m~1.5mtofacilitatethefullfilling.

压浆设备采用200型高压泵注浆，机械动力采用自备柴油机动力，此泵最大压力可达到8MPa。200typeHPpumpandselfowneddieselgeneratorwillbeused.Themaximumpressureofpumpis8MPa.

注浆时应采取跳越注浆，这样可使浆液充填密实。Itwillbegroutedinskiptomeetthedensityrequirement.

工艺流程：WorkmanshipFlowChart

人工依尺寸成孔搅拌水泥浆液小压力注浆待初凝后再度注浆封孔。ManualHolesMakingAsSized

CementMortarMixingGroutingwithLPSecondGrouting(Afteritisgenerallyconsolidated.)SealHoles

注浆技术要求：TechnicalRequirementsforGrouting

水泥浆液配制水灰比0.5~0.6；初次注浆时压力控制在0.2~0.3之间；待12小时后，再次注浆，二次注浆压力不得超过0.5MPa。以防止压力过大，造成基坑底板的破坏，注浆时可依据现场施工情况下调整注浆压力。Thewatercementratiois0.5~0.6.Intheinitialgrouting,thepressureshouldbecontrolledwithin0.2~0.3.Itwillbesecondlygroutedafter12h.Thesecondtimepressurecannotexceed0.5MPatoavoidthedamageforbottomslab.Thepressurecanbeadjustedaccordingtotheactualcondition.

浆液配制采用425#普通硅酸盐水泥，水灰比0.5~0.6，注浆量以浆满出底板为止。425#Portlandcementwillbeusedformixing,withthewatercementratioof0.5~0.6.Theareamustbefilledtillthemortarexceedsthebottomslab.

注浆管采用高压注浆管SJG 73-2020 岩土锚固技术标准，接头处应保证可承受1.0MPa的压力。HPgroutingconduitshallbeused.Pressureintheendshouldbear1.0MPa.

注浆过程中应时刻观察现场情况，以便控制注浆量与注浆压力，以免对基础底板造成不必要的破坏。Intheperiodofgrouting,takecareofthesiteconditionforthequantityandpressurecontrol.

质量保证措施QualityAssuranceMeasures

建立以项目负责为主的质量管理体系，严格落实各工序质量责作任制。Establishthequalitymanagementsystemandcarryouttheresponsibilitysystemforeachprocedure.

认真观察现场施工情况，并做好现场施工记录。Carefullyinvestigatetheconstructionconditionandmakerecords.

新建围墙工程施工方案安全措施SafetyMeasures

各工序、工种严格按相应的安全规定作业，严禁“三违施工”。Allcraftsandproceduresshouldstrictlyfollowsafetyrules.“ThreeDisobeyedConstructions”areforbidden.