搜索
qualified,finishedfixed.(4)thenecessaryconstructionequipmentconfigurationsareinplace,constructionworkersarrivedatthescene,holdingavalidworkpermitandcertificateofthecorrespondingtype.(5)theconstructionplanapproval,constructiontechnologytogivethelow-downtheworkhasbeencompleted.(6)enterthesiteinspectionofpipes,pipefittings,valvesandothercomprehensive.Pipes,pipesurfaceshallbefreeofcracks,scars,porosity,slag,folds,severecorrosionandotherdefects,openingandcloseflexibly,maintenanceofhighpressurevalvesoneatastrengthandtightnesstest,passtheinspection,testpipes,valvescleantheclosedlogo,placedneatlyinthespecifiedlocation.(7)enterthesceneofthepipelinecomponents,preformsaredesignedaccordingtotheirdocumentationrequirements,themodels,specifications,material,quantitycheck.(8)thepipelineofhighpressurepipeprefabricationfactoryintothescene,shouldcontrolone-linediagram,checkbytheirspecifications,sizes,materialsandtrends.1.2....,Itisimportanttoensurecorrectsizeandsurfaceroughness.Nomatterwhichmethodofcutting,withanglegrindercuttingsurfaceoxide,dross,ruggedandBurrBurrandGrind.(2)theincisionqualityshallconformtothefollowingprovisionsofthepipe:cutsurfacesshouldbesmooth,freefromcracks,heavyleather,Burr,bump,necking,dross,ferrousoxide,iron,etc.Cutsideslopedeviationshouldnotexceed1%oftheoutsidediameterofthepipe,andmustnotexceed3mm.1.2.4thepipinginstallation(1)afterinstallingtheorderprincipleisthefirstlarge-caliber,small-bore,highfirst,thentheground,OutdoorIndoor,headafterthefirstpipe,andpipemovingdeviceconnection,preferablyfromthedevicetotheexternalpiping,pipingandpipelineinstallationsynchronization.(2)prefabricatedpiping,pipeline,andthepipelineshould关键部位或特殊要求的施工工艺方案/措施一、钻孔灌注桩基础：施工时拟采用反循环钻机成孔，汽车吊吊沉钢筋笼，混凝土采用商品混凝土，混凝土输送车运输。1、场地准备：施工前先进行场地平整，清除杂物，钻机位置处平整夯实，同时对施工用水、泥浆池位置、动力供应、砂石料场、钢筋加工场地、施工便道等做统一安装。根据设计图纸对桩位进行精确放样，在桩中心位置钉以木桩，并设护桩，放线后由主管技术人员进行复核，施工中护桩要妥善看管，不得移位和丢失。2、埋设护筒：护筒采用6mm钢板制成，护筒内径比桩径大10-20cm。护筒顶端要高出地面0.3m—0.5m。为避免护筒底部悬空，造成塌孔，漏水、漏浆，护筒底应坐在天然结实的土层上，护筒周围0.5～1.0m范围内挖除，夯填粘土至护筒的0.5以下，护筒埋设应坚实，不漏水，护筒平面位置的偏差不大于5cm，护筒倾斜度的偏差不大于1%。3、钻机定位（1）钻机应稳定的安装在钻孔的一侧，钻机履带不得压在孔口的钢护筒壁上。（2）选择适宜地层的配套钻头和钻孔事故处理配套机具，接通水电供应。（3）调整钻机，调整钻头中心、桩孔中心及护筒中心三者在同一条铅垂线上，稳定好钻机，保持钻机牢固、稳定。4、护壁泥浆：采用膨胀土或粘土造浆方式进行护壁。针对不同地层的地质特性，根据以往施工经验配制调整泥浆，并在施工中定期检查浆液的比重、粘度、静切力、酸碱度、胶体率、失水率等指标。泥浆循环使用，废弃泥浆经沉淀处理后外运，以保护环境。钻孔泥浆由水、粘土（或膨胀土）组成。开工前应准备数量充足和性能合格的粘土或膨胀土，粘土性能应满足规范要求。qualified,finishedfixed.(4)thenecessaryconstructionequipmentconfigurationsareinplace,constructionworkersarrivedatthescene,holdingavalidworkpermitandcertificateofthecorrespondingtype.(5)theconstructionplanapproval,constructiontechnologytogivethelow-downtheworkhasbeencompleted.(6)enterthesiteinspectionofpipes,pipefittings,valvesandothercomprehensive.Pipes,pipesurfaceshallbefreeofcracks,scars,porosity,slag,folds,severecorrosionandotherdefects,openingandcloseflexibly,maintenanceofhighpressurevalvesoneatastrengthandtightnesstest,passtheinspection,testpipes,valvescleantheclosedlogo,placedneatlyinthespecifiedlocation.(7)enterthesceneofthepipelinecomponents,preformsaredesignedaccordingtotheirdocumentationrequirements,themodels,specifications,material,quantitycheck.(8)thepipelineofhighpressurepipeprefabricationfactoryintothescene,shouldcontrolone-linediagram,checkbytheirspecifications,sizes,materialsandtrends.1.2....,Itisimportanttoensurecorrectsizeandsurfaceroughness.Nomatterwhichmethodofcutting,withanglegrindercuttingsurfaceoxide,dross,ruggedandBurrBurrandGrind.(2)theincisionqualityshallconformtothefollowingprovisionsofthepipe:cutsurfacesshouldbesmooth,freefromcracks,heavyleather,Burr,bump,necking,dross,ferrousoxide,iron,etc.Cutsideslopedeviationshouldnotexceed1%oftheoutsidediameterofthepipe,andmustnotexceed3mm.1.2.4thepipinginstallation(1)afterinstallingtheorderprincipleisthefirstlarge-caliber,small-bore,highfirst,thentheground,OutdoorIndoor,headafterthefirstpipe,andpipemovingdeviceconnection,preferablyfromthedevicetotheexternalpiping,pipingandpipelineinstallationsynchronization.(2)prefabricatedpiping,pipeline,andthepipelineshould5、钻孔（1）开钻时应先在孔内灌注泥浆。开孔及整个钻进过程中，应始终保持孔内水位高出地下水位（河中水位）1.5～2.0米。并低于护筒顶面0.3米以防溢出。掏渣后应及时补泥浆。（2）保持钻具的稳定性和导向性，避免碰撞护筒。要及时修理锤头，更换新的耐磨牙块。（3）钻进过程中，随时注意孔内水压差，以防止产生流沙。对孔中泥浆随时进行检查，保持各项指标符合要求，不因泥浆过浓影响进度，过稀导致塌孔等。（4）钻进时及时填写钻孔施工记录，交接班时应交待钻进情况及下一班的注意事项。根据钻进程度、快慢情况以及泥浆取样分析判明地层变化。（5）因故停钻时，孔口应护盖，严禁钻头留在孔内，以防埋钻。同时保持孔内有规定的水头和要求的泥浆浓度、粘度，以防坍孔。6、钻孔检查、清孔成孔：（1）钻进达到设计标高时，用测绳进行测量并记录（钻孔施工人员应严格控制孔深，不得用超钻代替钻渣沉淀，更不能少钻），通知项目质检人员检测合格后，再请甲方监理工程师检查、验收。（2）钻孔完成后应用检孔规检测孔径和倾斜度。成孔孔径不得小于设计直径，倾斜度不大于1%，用长度符合规定的检孔规上下两次检查造孔是否合格，合格后方可清孔。（3）根据钻孔灌注桩的孔底沉渣厚度的要求，做好两次清孔，第一次是在终孔后，通过掏渣筒进行清孔；第二次在下好钢筋笼后进行清孔，以控制沉渣厚度标准。每次清孔终了必须测一次沉渣厚度，保证达到设计要求，并将实测数据记录在册。第一次清完孔后，检查孔深、垂直度、孔径和沉淀层厚度等，确认满足设计要求后，进行钢筋笼吊放及导管安装。7、钢筋笼加工吊装及导管安装：钢筋笼加工焊接在钢筋加工场集中加工，汽车运至施工现场后焊接成钢筋笼。钢筋笼骨架采用单面焊接。吊放钢筋笼采用吊车进行，钢筋骨架及时准确的吊装就位后，应牢固定位。钢筋笼周边要安放定位筋，确保保护层厚度。吊放时不qualified,finishedfixed.(4)thenecessaryconstructionequipmentconfigurationsareinplace,constructionworkersarrivedatthescene,holdingavalidworkpermitandcertificateofthecorrespondingtype.(5)theconstructionplanapproval,constructiontechnologytogivethelow-downthework