钱江苑基坑与土方开挖施工方案).doc

'浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程目录一、编制依据2二、工程概况2三、周围环境情况及工程地质条件3四、基坑支护方案的确定3五、基坑施工程序及作业前条件和准备4六、基坑围护施工8七、土方开挖施工程序10八、土方开挖注意事项11九、现场监测措施11十、质量保证措施12十一、应急抢险措施13十二、安全、文明施工措施14十三、附图constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程基坑支护与土方开挖专项方案一、编制依据：1.1《钱江苑一期七标段工程施工组织设计》1.2浙江华东建设工程有限公司提供的《工程地质勘察报告》1.3《钱江苑一期七标段工程基坑围护工程设计》1.4《岩土工程勘察规范》（GB50021-2001）1.5《建筑地基基础施工质量验收规范》GB50202-20021.6《建筑工程施工质量验收统一标准》GB50300-20011.7《建筑机械使用安全技术规程》JGJ33-961.8钱江苑一期七标段工程施工图纸二、工程概况本工程为钱江苑一期七标段项目，包括5幢9#、10#、11#、12#、13#住宅楼及地下室，建筑层数为地上18～28层、地下一层，总建筑面积74229.07㎡。1.结构概况本工程建筑结构类型为钢筋混凝土剪力墙结构，基础采用钻孔灌注桩，本工程桩基采用钻孔灌注桩，桩径有ф1000、ф700、ф800，桩端持力层要求进入⑧-3中等风化凝灰岩不小于1D米，有效桩长33~40m，总桩数654根，单桩承载力特征值分别为5000KN、3200KN、3800KN，桩砼强度等级为C35；桩基施工质量标准以桩长控制。三、周围环境情况及工程地质条件周围环境情况：本工程位于杭州市钱江路与唐家井路交叉路口北侧,本工程的北面临近河道，距开挖边界最近距离为20m，南面为钱江苑一期八标段项目constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程(在建)，西面为唐家井路，距开挖边界最近距离为6m,西面为施工总运输道路,东面为规划道路。工程地质条件及地下水条件:工程地质条件及地下水条件详见浙江华东建设工程有限公司提供的本工程地质报告。本工程±0.000相当于黄海高程7.800m，自然地坪标高为－1.30m。基坑实际开挖深度为4.95～5.65m其中主楼局部部位的电梯井、集水坑挖深均较深，最深开挖深度为6.30米。本工程地下室的特点：1、地下室开挖面积较大，基坑深度较深；2、本基坑属于二级基坑，基坑工程安全等级的重要性系数为1.0；3、周边环境比较复杂，须有效控制基坑变形；4、开挖深度范围内土质条件一般，但下部土质条件差。四、基坑支护方案的确定：从安全、技术、环境、经济及施工等各方面考虑，本工程基坑采用以放坡加土钉锚杆的复合土钉支护形式。具体基坑平面布置图见浙江省设计研究院的基坑围护图纸。确定本工程由3台挖土机机械开挖，基坑支护采用土钉墙并结合大放坡的支护方案，其中基坑西面临近施工运输总道路（1D-1D剖面）采用1:0.2放坡加土钉锚杆的复合土钉支护，南面、北面、东面采用1:0.7二级放坡面喷混凝土(1A-1A、1B-1B、1C-1C剖面)，其中北面13#楼局部采用1:1放坡加土钉锚杆的复合土钉支护，加设一排尾径100，桩长4.5m，间距1.5m的松木桩(1E-1E、1F-1F剖面)。基坑内外采用自流深井降水，共设置56个，井底标高为-15.00m。支护方案具体详见浙江省设计研究院设计的基坑围护结构方案。坑外排水：基坑外四周设置300×4constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程00的排水沟（沟边及沟底浇注100mmC15碎石砼），以排除天然来水、地表水及基坑内抽取的水。坑内排水：在基坑内靠近基坑底边线处也设置一条300×300的排水沟，每隔15m设置一个500×500×600的集水井，用砖砌护壁。基坑排水采用简易集水井排水，并进行24小时值班抽水。对于地表处的雨水、施工排水，采用地面排水沟截流，引至城市下水管道的方法解决。具体做法是，在基坑周边地面处设置贯通的地面排水沟，并在沿排水沟一定距离处设置集水井。将地面雨水、基坑内明排水集中后，排入城市下水管网。五、基坑施工程序及作业前条件和准备5.1作业人员(配置、资格、职责)序号作业人员名称人数人员资格职责1作业负责人1人有组织协调能力，有现场管理经验。负责现场挖土作业的具体组织、指挥2工程主管1人要求熟悉土建结构的施工，有组织才能。负责现场施工生产、人员和机械的调配、权衡。3技术人员2人要求土建结构施工经验，熟悉施工技术及验收规范。负责挖方作业的技术交底及现场技术问题的处理与解决4测量人员:4人要求熟悉导线测量定位测量的方法，能熟练操作各种测量仪器。负责挖方作业的测量放线与标高控制5安监人员3人经过安全员岗位培训，持证上岗。constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程负责本项作业的全面安全工作，检查和监督施工机械设备运转和作业人员操作程序、规范等。及时处理和解决现场出现的问题。对违反安全操作规程的作业人员进行教育，对不服从者有权停止其工作。6质检人员2人要求有质检工作经验，经过培训，有质检员上岗证，持证上岗。负责挖方作业的放线尺寸及标高的控制及检查，负责本项作业的全面质量工作，对不按技术规范及方案要求操作的人员有权停止其作业。及时处理和解决现场出现的问题。并负责工程验槽、隐蔽及验评的报验工作。7电工4人参加过劳动局培训并取的合格证者方可上岗。负责挖方作业的用电管理8土石方机械操作工5人熟悉机械性能经过培训，有上岗证，持证上岗。负责土石方机械的操作，要严格执行机械操作规程9汽车驾驶员20人熟悉机械性能经过培训，有驾驶证，持证上岗。负责汽车的驾驶，要严格执行机械操作规程10辅助工15人有一定的施工经验。负责挖方作业的辅助作业及底层土清理，听从作业负责人的组织与指挥11喷锚工人15有一定的施工经验负责基坑喷锚作业，听从作业负责人的组织与指挥constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程5.2作业工具序号作业工机具名称数量型号备注1经纬仪2台J6E检测合格2水准仪4台S3E检测合格3水准塔尺4个检测合格4挖掘机3台设备完好5翻斗车15台10m3设备完好6泥浆泵4台设备完好7气腿式凿岩机4台YT29设备完好8灰浆搅拌机2台250轻型设备完好9混凝土喷射机1台PZ—5D设备完好10交流弧焊机1台BX3设备完好11挤压式注浆机2台JZB—2设备完好12空气压缩机3台W1.8/5设备完好5．3作业程序的步骤和方法现场三通一平→测放开挖上口线→自流深井施工→土方按要求分层开挖→定孔位→土钉施工→修坡→铺挂钢筋网片→喷射混凝土→下步开挖护坡。土方与护坡相互配合是关键，土方按护坡挖土技术交底开挖并修坡，应保证坡面平整，达到设计的开挖位置。土方应分层开挖，本工程基坑（1D-1D、1E-1E、1F-1F）剖面分5次开挖，第一层从自然地坪－1.30m以下开挖至-2.75m,第二层开挖至-3.85m,第三层开挖至-4.95m,第四层开挖至-6.10m,第五层开挖至-6.95m,土方开挖后应立即修土护坡再开挖下一层土。（1A-1A、1B-1B、1C-1C）剖面分4次开挖,第一层从自然地坪－1.30m以下开挖至-2.80m,第二层开挖至-4.30m,第三层开挖至5.80mconstructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程,第四层开挖至-6.95m,土方开挖后应立即修土护坡再开挖下一层土。基坑土体开挖要求分段分层均衡开挖，每段长度20～25m,土钉锚杆施工完成48小时后方可进行下层土方开挖,分层开挖超深<30cm,至底板底标高后及时设垫层。5．4质量通病及预防质量通病及预防项次质量事故预想预防措施1开挖尺寸偏差较大土方开挖时，一定要按照测量人员给出的边线进行开挖，开挖过程中要保护好塔中心定位控制桩2边坡塌方1）确定合理的边坡坡度；2）开挖超高处加临时支撑；3）地下水降至坑底以下，并做好坑边的排水；4）坑边避免重载车辆碾压3基坑泡水1）基坑周围设排水设施和挡水堤；2）做好基坑内的排水工作4滑坡1）做好基坑周围和基坑内的排水工作2）边坡及时加固，禁挖坡脚；3）避免基坑近距离的震动和重压5桩基破坏开挖过程中要按方案要求作业，要保护好桩基，不得机械碰震6边坡，坑底超挖1）机械开挖预留20mm人工挖土2）全程监测边坡和坑底标高constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程六、基坑围护施工土钉墙施工:在土钉墙支护区，工程桩施工结束后，按施工计划进行土方开挖和土钉墙支护。土钉墙施工流程：每层每段土方开挖以后，首先修坡，然后：1、用洛阳铲造孔至设计深度，孔深误差≤50mm，孔位误差≤100mm，孔径误差≤5mm，土钉保护层厚度不小于30。在杂填土中土钉无法成孔，采用击入f48×2.5焊接管。2、制作安装土钉。土钉锚管采用φ48mm壁厚2.5mm长为9.0m及长为10.5m两种钢管，采用f48×2.5焊接管施工时，钢管一端制成桩尖状，在管壁上每隔30～40㎝呈梅花形开设10～15㎜小孔，在f48钢管的外壁每@1500设30×30×3长50角钢倒钩。钢筋土钉采用φ18螺纹钢加工，对中支架间距不大于2.0m，使土钉主筋保护层厚度不小于30mm，安装土钉时，如一次无法放至孔底，重新清孔，土钉成孔后应马上安设钢筋，防止塌孔。3、喷射混凝土强度等级为C20,水泥采用32.5普通硅酸盐水泥，喷射第一层混凝土厚3～5cm。喷射混凝土采用干喷法，在喷头处加入水，水量控制以最小回弹率为准，施工中可根据坑壁土层土质、含水量及土方开挖速度，按需要添加2～5%的速凝剂，放坡及土钉墙的喷射混凝土面层上下、左右每2米均布置泻水孔。4、注浆。注浆浆液配合比（重量比）为水灰比0.5，灰砂比为1：0.2，水泥砂浆做到搅拌均匀，随拌随用，一次拌料在初凝前用完。锚管内注浆用水灰比0.5的纯水泥浆，土钉孔内注浆用M10水泥砂浆，土钉注浆采用从孔口向孔底压浆，孔内放置排气管，孔口用止浆袋，注浆过程中应确认孔内气体全部排出，保证注浆充盈，注浆压力约0.4～0.6MPa。钢管注浆不设排气管，注浆前对钢管内杂物进行清除，确保注浆通畅。5、绑扎钢筋网。采用f6.5@200×200钢筋网，钢筋的搭接长度为300mm，上下施工段之间以及水平加强筋的搭接采用焊接。6、锚杆头采用2φ14通长加强筋压于钢筋网之上，2φ20L120constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程压于加强筋之上，与土钉主筋焊接。7、喷射第二层混凝土至设计厚度,坡顶外翻1000mm，喷射100厚C20混凝土。8、在距基坑边缘20cm处设置高1.2m的钢管临时栏杆。9、基坑周围10米范围内地面荷载不大于15KPa，土方运输车辆、砼泵车等重车严禁长时间停留在基坑周围。自流深井施工:深井井点施工程序：井位放样→做井口、放护筒→钻机就位、钻孔→回填井底砂垫层→吊放井点→回填管壁与孔壁间的过滤层→安装抽水控制电路→试抽→降水正常工作。1）、井点施工应与支护施工同步进行，本工程开挖之前，先进行井点降水施工；由于上部为耕土，为了方便冲孔和保证降水效果，宜确定井点位置，施工完毕，待水位下降后再逐层挖土。２）、井点施工应达到以下要求：a、按2008年11月5日围护设计图纸设置井点，管径300，采用水冲法成孔。b、井管冲孔直径为φ800mm。孔冲成后拔出冲管，立即插入井管，并在井管与孔壁之间填砂滤层以保证水流畅通，砂滤层所用的砂要求干净的粗砂，填灌均匀，填成离地面1－1.5m处，最后用粘土封口，防止漏气。c、井管冲孔深度宜比滤管底深0.8m，以防冲管拔出后部分颗粒沉于底部而减少沉管深度，并露出地面0.2m。d、井点过滤部分应放在含水层适当范围内，保证井点的出水效果。e、井点出水排入基坑上部四周排水沟，经积水坑沉淀后排出。f、出水情况：正常的排水应是细水长流，出水澄清，刚开始抽水的几天，出水量较大，以后逐渐减少。h、井点正常工作后，值班人员应24小时值班巡查，设备运行情况，发现问题及时处理，保证机组的正常工作。constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程3）、自流深井穿底板做法：首先将底板范围的PVC波纹管用钢管代替；钢管上焊上止水片，施工基础；深井完全停止工作后用8厚钢板封死，封前将底板范围的孔洞用底板混凝土强度等级高一标号的微膨胀混凝土填实。4）、根据我公司以往的施工经验，砂质土的地下水位变化情况较大，因此应作好充分的准备，落实好备用井点设备，一旦水位降不下去或降水缓慢，立即增设井点，以满足施工要求。七、土方开挖施工程序1、先放好坡顶线、坡底线，经复测及验收合格后开始开挖。2、本工程总土方量约10万立方米,开挖顺序:东面向西面进行挖土,10#楼、9#楼地下室土方先进行施工，而后进行13#楼及11#楼土方施工,最后为12#楼。机械挖土分二次进行开挖，⑴第一次挖土总土方量约为4万立方米，每日计划出土量0.5万立方米，每辆挖机日出土量为750立方米，所以投入斗量为1m3的PC200反铲挖掘机2台，配合土方车30辆，土方运输采用10m3的装载汽车，一天来回25趟（晚上不作业）；⑵第二次挖土总土方量约为6万立方米，每日计划出土量0.6万立方米，定为20天，锚杆养护10天，每辆挖机日出土量为750立方米，所以投入斗量为1m3的PC200反铲挖掘机2台，配合土方车20辆；土方最后运输至钱江新城区域内的空地上；最后预留20cm土层人工清理。八、土方开挖注意事项1、土方开挖坚持在设计方案的指导下，严格按各工况先后顺序进行施工。2、挖土工程采用单斗履带式挖掘机，配备自卸车运土，先挖除上部杂填土，基坑降水至设计标高时后方可开挖。挖土采用分层开挖的方法，至坑底预留20～30cm，人工修土至设计标高，以免机械超挖而绕动原土体。constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程3、土方开挖期间基坑周围10m范围内堆载不得超过15Kpa，塔吊等大型设备处应另行加固。土方开挖必须分层分段进行，每层开挖深度不大于1.5m，每个施工段开挖长度不大于25m，严禁超挖或在上一层未加固完毕就开挖下一层。4、土方完成后，经有关单位基槽验收后，方可进行下道工序施工。九、现场监测措施为确保施工的安全和开挖的顺利进行，在整个施工过程中应进行全过程监测，实行动态管理和信息化施工。现场监测对于基坑的土方开挖和地下室施工是必不可少的重要环节，只有进行现场监测，才能及时获取基坑开挖过程中维护结构及周围土体的受力与变形情况，掌握基坑开挖对周围环境的影响，以有效的指导施工，及时调整施工措施，确保周边道路、建筑物的绝对安全。监测内容1、周围环境监测：周围围墙、厕所、变电房沉降、裂缝的产生与发展等。2、围护体沿深度的水平位移监测：利用测斜管监测，共设置10根，围护体侧向位移报警值：累计5㎝（其中靠近唐家井路的ID-ID剖面范围4㎝）连续3天位移变化3㎜/d。3、基坑内外的地下水位变化监测：水位变化控制值为80cm/天监测要求1、对基坑周围环境的监测，应在工程桩施工之前就开始进行。2、一般情况下，开挖期间每天观察一次，如遇到位移、沉降及其变化速率较大时，则应增加观测次数。constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程3、观测数据一般应当天填入规定的记录表格，并及时提供给建设、监理等单位。4、基坑开挖施工开始后，每一周应提供基坑开挖一周监测阶段总结报告，具体内容包括一周时间内所有监测项目的发展情况，内力和变形最大值以及最大位置，如观测量大于控制值，应及时通知建设、监理及施工单位以便采取应急补救措施。业主已委托了丰富经验的专业监测单位实施监测，及时将监测结果提供给施工单位、监理单位、建设单位，当超过报警值时，以便采取应急措施。十、质量保证措施1、开挖前需对建筑物位置的标准轴线、基槽及放坡尺寸、灰线尺寸进行检查。2、开挖时，先沿灰线直边切出槽边轮廓线，再自上向下分层开挖，每层挖土深度不大于1.5m，挖出的土堆在基槽2m以外，以保证边坡的稳定。3、开挖后，及时组织甲方、监理单位对基槽及桩位尺寸进行验收。4、土方开挖宜对称进行施工，以利土方应力的释放，减少对工程桩的挤应力。5、土方开挖应根据工程桩汇总表注意欠送桩的标高，以防挖土机挤斜（断）工程桩。6、开挖的平面尺寸、边坡角度尺寸和深度，必须严格按本方案的设计要求和现场技术交底要求操作。严格控制坑边堆载重量，严禁挖斗碰撞桩头。7、对边坡的防护采取分层，横向分段的施工形式，在每层土坡开挖前，设灰线，采用挖掘机开挖边坡配合以人工修坡，不可破坏边坡原状土的稳定性。constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程8、在接近基底深度土层开挖，由观砌控制挖掘深度，机械挖土至基底标高以上20～30cm时，开始人工修土，严禁超挖。挖土完成后立即进行垫层块石及砼施工以减少基层暴露时间。十一、应急抢险措施为确保基坑周边环境的安全和正常使用，确保工程的顺利进行对可能出现的险情作如下对策：1、建议成立由业主、监理、施工单位组成的基坑开挖应急处理小组，以利于突发事件的及时处理。2、要求各种措施专人落实与实施，切实保证本基坑的安全。3、开挖过程中若出现维护体变形过大或变形发展速率过快，应立即停止相应范围的土方开挖，必要时采取回填措施或在基坑底设一排松木桩以控制维护体的变形发展。4、施工现场应具备一定的抢险应急设备及材料，如发电机、草包、钢管、水泥、木桩、水泵、注浆设备等等。5、降雨防护：在降水时极易对土坡边坡受到破坏，造成土体滑移坍坡，因此在施工中遭遇雨水天气，采用塑料薄膜及时覆盖边坡，避免雨水冲刷，在基坑周边场地硬化处理，在土坡脚设临时集排水系统。十二、安全、文明施工措施1、全体施工人员进行安全教育，提高安全意识。进入现场必须戴好安全帽；严禁在挖土机作业范围内走动。2、基坑在挖土中要及时排水。3、位移较大或者出现较大裂缝，立即停止挖土，同时技术处理。4、及时平整堆土场地，压实、畅通道路和排水等工作。constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13 浙江昆仑建设集团股份有限公司钱江苑一期七标段（R21-14组团）工程十三、附图1、土方开挖施工总平面布置图2、基坑周边防护栏杆示意图3、ID-ID、IE-IE基坑土钉墙围护剖面图及锚杆节点详图4、深井详图5、泻水管示意图、锚管详图constructionmeasure1)duringtherainyseasontopreventsettlementofformworkscaffoldingduringconstruction,loose;concretepouringrain,slumpinmoderationdecreases,newpouringconcretetocoverwithplasticsheeting;heavyrainopenedpouringconcreteisstrictlyprohibited.2)keepdrainagefacilitiesclearofaggregatesandconstructionsite.Yuqiantodigdrainageditches,equippedwithasufficientnumberofsubmersiblepumpsandwaterpumpsformaintenance,inspection,maintenance,ensuretheequipmentingoodcondition.3)cementtemporaryfacilitiessuchaslibrary,materialshouldbehigherthantheoutsideelevationandfeaturewaterproofanddrainagefacilities.4)meansoftransportandsecurityandtoskidtherainequipment.7.6concreteconstructionqualitycontrol(1)rawmaterialsandtiethandesigngravelmaterialmustforchemicalnatureandthephysicalpropertiesexperiment,meetrequirementsrearcanusing,cementshippedsiteHou,onitsvolumesecurity,andconsistency,finedegrees,dodirectedanalysis,theindexqualifiedrearcanusing;onmixingandconservationwater,withtestmortarstrengthofmethodfortest;aggregatebyfineOrthopedic,andintheaggregate,pointswarehousestacked,regularlydetectionitscontainingwaterrate.sandfinedegreesmoduleregularlycheck,ifoverprovidesofmodule0.2Shi,Arerequiredtoadjustthemixproportionofconcrete.concretemixdesign,accordingtomaterialcharacteristicsandconstructionofconcreterequirements,accordingtodesignrequirementstodeterminethestrengthanddurabilityofcement,water/cementratioisdetermined,inaccordancewithconstructionrequirements,workability,slump,sandcoarseaggregatesizedeterminestherate,waterconsumption,andthenusingabsolutevolumemethodtocalculatethequantityofsandconstructionmixtureratio.Concreteslumpcontrolinthecontextofdesigndrawings,accordingtotheminimumvalueindifferentparts.Accordingtothedifferentparts,withl~4-gradedconcrete,eachpouringasame-gradeconcrete,accordingtothenormativesample,asetofthreespecimens,instandardcuringcondition,measuringthecompressivestrengthof7d,14d,28D,anddoatestrecording,asinformation.(2)transportofconcretequalitycontrolhorizontaltransportmainlyusedconcretemixertrucktransport.Concretedeliveryprocessshouldshortenthetransporttime;stopbleedingandexcessivelyreducingcollapse;concretefreefallingheightisgreaterthan2m,settingtheslidingtubefeeding.(3)qualitycontrolofconcreteinconcretepouringprocess,hierarchy,order,materialthickness,vibratingstrictlyaccordingtotherequirements.Substandardconcretewarehousesisstrictlyprohibited.Whenpouringconcrete,isstrictlyprohibitedinthecabinwithwater.Concretesuspensionandthe13'