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CONTENT:
1.Project View
2.Construction Arrangement
3.Construction Process
4.Quality Control
5.Main ManagementMeasure HSE雨天不合适进行回填施工,必须施工时,分段尽快完毕,且宜采用沙土等填料,周围有防
2.7雨和排水措施、桩处理措施3根据桩基竣工资料,认真检查所有桩的顶标高严格控制挖机的开挖深度,防止损坏桩头
3.1土方开挖中,出现桩头后,立即对桩位,桩倾斜度和裂缝进行检查,记录同步与桩基竣
3.2工资料对比桩周围的土,必须由人工挖除,不得使用挖机,防止损坏桩头
3.350cm
3.4切割桩高度,每次不超过2m;切割时,必须将桩所有切断,然后在转运到指定场地为防止桩头损坏,严禁用挖机强行将未切断的桩头拉倒桩处理原则
3.51)对于倾斜度在0〜3%范围内的桩,按照正常桩施工对有裂缝时桩要设置钢筋笼,钢筋笼底部超过裂缝位置并浇筑碎
2.0m,)对于倾斜度不不大于日勺桩,要将资料提供应设计部,业主然后按照设计部提供的方案23%进行处理)对于偏位欧桩,要将承台加大桩偏位的尺寸即为承台加大勺尺寸3I IH
3.Construction Process
1.Excavation
1.1After finishingthe surveycontrol point arrangement,which includingthe controlbase line,axis andbench mark.Calculate the earthwork volume.Control surveyand check the axisofbuilding,after checkingthis willbe thebasis of construction control.
1.2Arrange themachines go inside andoutside the site andearthwork transportationrouteproperly.Protect thetemporary water and powersupply.
1.3Excavation steps:First stepexcavate to-
2.70m dividethe excavationinto twolayers:first layerexcavate to-
1.20m,second layerexcavate to-
2.70m;Retain somesoil to backfill and use itto buildtheroad.Second stepparts of it excavate to-
4.20m Set the widthof8m platformat-
2.70m levelposition,small excavatoron thisplatform andexcavate to-
4.20m.Use Relayexcavation method”,1big excavatorat-
1.20m positionof foundationside and1small excavatorat-
2.700m on thewidth of8m platform.Small excavatorcan excavate to-
4.20m,at the same timetransfer thesoil to bigexcavator,load in the carby bigexcavator andtransported tospoil location.Theposition excavatorcannot touch,cooperated withmanpower toexcavate and make flat.Third steppiling the steel sheet pile aroundthe liftpit,do thesupport system anduselong-armexcavator toexcavate from-
4.20m to-
8.00m.The bottomfoundation should20cm soillayer forworkerto cleanand makeflat toavoid theover excavationand disturbanceof base foundation.Forth step,after finishingthe liftpit foundationstructure,remove thearound steel sheet pile.Excavate leftpart ofbottom slabto-
3.60m.Excavation stepfinished.For excavationplan andsection,please referto the excavation methoddrawings.
1.4After finishingexcavation step1and2,set the observation pointat the top,middle,bottomof slope and inside the foundation.Surveyors shouldsurvey2times1day tocheck thestabilityof foundationslope.
1.5After finishingexcavation,surveyor mustset the base lineand inspect the foundationditch.After foundationditch inspectionqualified,workers excavate20cm reservedsoil.Use therulermeasure the50cm standardrod,check the base foundationelevation at any time.Set thefoundationside lineon thebasefoundation.After levelingthe foundationditch,carry out theconstruction cushionetc.next stepimmediately.
1.6Set the road passinginto the foundation onthe softsoil.Maintain thesurface andbase offoundationdrainage system.
1.7Prevent thebasement waterand rainwater soakthebasefoundation.Reserve50cm widetemporarydrainage ditchalong theside foundationoutside30cm.Setthesump pitat thecorner,set onewater pumpat1foundation pit and pumpthe water of inside foundation.Prevent thesurface watergoinside the foundationpit,should use the4-hole bricksset the100mm wide,300mm highdams outside the foundation
0.5m.Use thecolor clothcover theslopeto preventrainfall.
1.8Excavation inlayers,divide surfacesand andmud toload into cars.The backfill sandtransported toMD4,the mudtransported outside.The backfillsand andmud mixedin thecarsin not allowed.
2.Backfilling ofearthwork
2.1Clean therubbish andmud beforebackfilling andset cut-off drainaround to preventsurface waterpass inside the backfillarea of foundation tosoak foundation,which willcausefoundation settlement.
2.2Should firstuse the backfillsand,clean theorganic impuritiesand grainsize largerthan50mm sand,the water content shouldmeet the requirement.
2.3Backfill sand should bespread inlayers andcompacted,every spreadingsoil thicknessandcompaction timesshould according to the soil quality,compacting factorand equipmentcapability.
2.4Backfill from thebase,from baseto topthe holewide horizontalspread andcompact soilevenly.When deepand shallow foundation links,first backfillthe deeppit untilthe samelevelas shallowpit and then fill.Compact comprehensively.For example,filling segmentformingstep shape,the slopeofit is1:
2.Layer junctionshould bestaggered;the upperand lowerlayerjunction should not less than
1.0m.Use finesoiltobackfill bothsidethebase walland pipe.
2.5Make flatthebackfillsand beforethe backfillingand compacting,ramming accordingto acertaindirection,1compaction andhalf compaction,one byone,row byrow,cross twiceandcompact inlayer.When compactingthe foundationpitandground,the compactionway shouldstartfrom thearound sideto thecenter.When usingsmall equipmentsuch asfrog rammingmachineto compact,level thebackfilling beforecompacting,tamping machineshould ramminginturn,evenly separateand leavingno gaps.
2.6After backfillingand compactingthe soil,should do the cuttingring samplingaccording tothespecification tomeasure themass densityof drysoil.When meetingtherequirement,thenspread theupper layersoil.
3.Piles treatment
3.1We shouldcheck allthe topelevation ofpiles accordingto the pile completiondata.And strictlycontrol the excavation depth of excavator,avoid damagingthe pile head.
3.2Check andrecord the pile position,pile inclination,and crack
3.3The soil50cm aroundthe pilemust beexcavated byworkers.Cannot usethe excavator,avoiddamaging the pilehead.
3.4For thecutting pileheight,every timeshould notmore than2m.We mustcut allthe pilesandtransfer to the specifiedsite.Excavators areforbidden topulled downthepilehead whichhasn5t beencutto preventthepilehead damage.
3.5Pile treatmentprinciples:1For theinclination ofpile in the rangeof0〜3%,we constructedthe pilesnormally.Weshould setthe rebarcase forthe piles which havecracks.The bottom of rebarcase should
2.0m deeperthan thecrack position,and pourthe concrete.2For theinclination ofpile more than3%,we shouldprovide thedata to the designersandthe owners.Then treatit accordingto themethod which is providedby the designers.3For thepileswhichare deviated,we shouldenlarge thepile cap.The piledeviationdimension isthepilecap enlargementdimension.
四、质量控制、土方开挖工程质量验收原则I容许偏差或容许值(mm)挖方场地平整项序检查项目检查措施地(路)面管沟柱基基人工机械基层坑基槽标图水准仪检查1-50±30±50-50-50主经纬仪、用钢尺长度、宽度(由设+200+300+500控2+100-计中心线向两边-50-100-150量项目量)本工程为水泥土边坡设计规定3搅拌桩重力式挡墙用两米靠尺和楔表面平整度12020502020形塞尺检查般基底土性设计规定观测或土样分析2项i、土方回填工程质量验收原则2容许偏差或容许值(mm)挖方场地平整项序检查项目检查措施地(路)面管沟柱基基人工机械基层坑基槽主标高水准仪检查1-50±30±50-50-50控分层压实系数设计规定按规定措施项2目取样检查或直观回填土料设计规定1鉴别般分层厚度及含水水准仪及抽样检设计规定2项量查目表面平整度用靠尺或水准仪
320203020204.Quality Control
1.Earthwork excavationquality acceptancecriteriaAllowable deviationmmThe excavationsite PipeItemNo InspectionItem InspectionmethodColumn Thegroundformation ditchbaseroad baseFoundation砂ManualMechanicalworkFoundationditch1Level-50±30±50-50-50Check by levelLength,WidthFromDominant+200+300+500thedesigncenter lineItem2+100-Theodolite and steel ruler-50-100-150to bothsidesThis project is Cementsoilmixing pilegravity type3Slope Designrequirementretaining wallCheck by two-meter ruler1Surface Evenness2020502020and wedgeplug rulerGeneralCheckby observationorItemBasement soil2Design requirementanalysisof soilsamplecharacter
2.Earthwork backfillingquality acceptancecriteriaAllowable deviationmmColumn Theexcavation sitebaseformationFoundation PipeThe groundItemNo InspectionItem Inspectionmethodpit Manualditch roadbaseMechanicalFoundationworkditch1Level-50±30±50-50-50CheckbylevelDominantLayering AccordingtoItem2Design requirementcompactingfactor prescribedmethodSampling inspectionorvisual1Backfilling soilDesign requirementidentificationGeneralLayeringthickness CheckbylevelandItem2Design requirementandwatercontentsampling3Surface evenness2020302020Ruler orlevel
五、重要管理措施、安全管理及防护技术措施1基坑的防护
1.1土方开挖要察看市政资料弄清地下管网等,必耍时探明状况后再行开挖
1.
1.1在距离坑边周围用钢管设置两道护身栏杆,立杆间距高出自然地坪埋深
1.
1.
22.0m p484m,
1.5m,
0.5m基坑上口边范围内不许堆土、堆料和停放机具各施工人员严禁翻跃护身栏杆基坑施工期间设3m警示牌,夜间加设红色灯标志设置专职安全员,定人定期对土体水平位移、地表沉降监测,发现问题及时告知设计、建设、监
1.2理等单位,共同处理在土方开挖时,挖土机等施工机械,严禁碰撞基坑内桩基
1.
31.4多台挖土机在同一作业面机械开挖,挖土机间距应不不大于10m;多台挖土机在不同样台阶同步开挖时,上下台挖机前后应相距以上30m基坑外施工人员不得向基坑内乱扔杂物,向基坑下传递工具时要接稳后再松手
1.5坑下人员休息时要远离基坑边,以防不慎
1.6施工机械一切听从指挥,所有车辆必须严格按规定的路线行驶,防止撞车人员尽量远离施工机
1.7械,挖土机工作回转半径范围内不得站人或进行其他作业如有必要,先告知操作人员,待回应后方可靠近挖土机和运土车行走时,必须注意上空电线,不得在架空输电线路下工作;如在架空输电线一侧
1.8工作时,垂直与水平距离分别不得不不不大于与时
2.5m4〜6m110〜220kV夜间作业,机上及工作地点必须有充足日勺照明设施,在危险地段应设置明显的警示标志和护栏
1.9雨季施工,车辆行驶道路必须铺设完好,路边做好排水,以保证行车安全
1.
10、环境保护或环境卫生管理措施2防止扬尘及大气污染措施
2.1土方由合格的运送单位施工,并签订运送协议,在协议中明确企业的环境规定在现
2.
1.1场出入口设专人清洗车轮,并拍实车上土或严密遮盖,运载工程土方最高点不超过车厢上沿边50cm,缘不高于车厢上沿用于工程预留的回填土,为防止扬尘,采用喷洒覆盖日勺措施;
2.
1.2对施工道路铺设碎预制板,在出口处设置洗车池,并设专人负责;
2.
1.3在现场设置一辆洒水车,安排专人负责,根据现场状况对现场进行洒水,防止扬尘;
2.L4防止水污染措施
2.2临时厕所设置化粪池,污水经化粪池过滤、沉淀后排入市政污水管线防止噪声污染措施
2.3建立健全控制认为噪声的管理制度;
2.
3.
12.
3.2噪声值监测执行《建筑施工场界噪声测量措施》(GB12524),土石方施工阶段昼间不超过75分贝,夜间不超过55分贝,并且常常测试(600〜2200为昼间,2200-600为夜间)现场环境卫生管理
2.4施工现场设专人负责整顿、保持现场整洁卫生做到施工现场无积水、车辆不带泥沙出现场
2.
4.1每天派人洒水打扫施工道路,绿化、美化施工现场;指定专人每天清理办公区,保证清洁卫生,做到无积水、无污物;242做好施工现场环境保护日勺监督检查工作,每月初、月中和月末对环境各项工作进行一次检查,
2.5对存在的问题及时采用纠正和防止措施,并做好文字记录和存档工作、防止扰民措施3本工程地处医院附近,为保证正常的施工秩序,尽量减少对周围办公、生活的影响,制定如下措FV施施工现场倡导文明施工,建立健全控制人为噪声的管理制度,尽量减少人为的大声喧哗,增强全体
3.1施工人员防噪声扰民的自觉意识;随时与现场周围有关部门获得联络,对他们的意见、提议进行合理采纳,对有关施工工序安排、
3.2工人操作方面日勺问题,在生产调度会上进行处理;在土方施工阶段,坚持定期检测噪音,保证噪音低于临界值;
3.3对人为活动噪声建立管理制度,尤其要杜绝人为敲打、叫嚷等现象,最大程度地减少噪声扰民
3.
45.Main managementmeasure
1.Safety managementand protectiontechnical measurement
1.1Foundation pitprotection
1.
1.1Check themunicipal informationand clarifythe undergroundpipe workbefore excavation,should verifythe circumstancesbefore excavationif necessary.
1.
1.2Set tworailing withq48steel pipesatadistance aroundthe foundation.Pole spacingis4m,
1.5m abovethe natural floor and
0.5in depth.Within3mofupper side of foundationpit,piling upsoil,materials andparking machines are notallowed.Workers areforbidden tojump overthe railing.Setup warningsigns andred lightmarks during the pitconstruction
1.2Set upsafety supervisor,checkthesoil horizontaldisplacement andsurface subsidenceatdefinite time.Notice thedesign,construction andsupervision unitsin timeif findingproblems,solvethe problemstogether.
1.3Excavator andother constructionmachinesareforbidden tocollide pilesinsidethe pit during theexcavation.
1.4Some excavatorsexcavate onthesameworking surface,the spacebetween each
一、工程概况、工程名称住宅工程1MD
3、工程位置越南胡志明市第七郡富美兴新城区
2、建设单位富美兴联营企业
3、设计单位中华太平洋建设征询企业
4、监理单位中华太平洋建设征询企业
5、总承包单位中国建筑东南亚有限企业
6、工程设计概况7建筑功能及规模该工程为住宅工程;总建筑面积为其中地上为地下室为
7.1181,286m2,154,863m2,占地面积为上部塔楼包括栋层;栋层;26,423m226,479m2Bl,B2,B324Cl,C221DI,D2,El,E2栋层地下室为一层,为停车场
167.2标图:±
0.000相称于绝对局程
2.300m;GF室内地坪
1.15m;地卜室底板面标图为-
3.150m;原地面平均标高为-
0.2m建筑物总高度Bl,B2,B3栋
83.15m;Cl,C2栋
72.65m;DI,D2,El,E2栋
56.75m构造类型栋为框架一剪力墙构造栋为剪力墙构造
7.3B C,D,E基础形式桩承台基础
7.
4、基坑开挖深度本工程自然地坪绝对标高为基坑开挖平均深度为最大开挖深度
81.7〜
2.8m,
3.6m
8.0mo、施工难度9地下室构造施工为本工程口勺施工重点和难点,软土地基,面积大,工期紧,设备和劳动力投入
1.多土方施工又是地下室施工的重点本工程最大开挖深度为平均开挖深度为
2.-
8.0m,-
3.6m othershould morethan10m;If excavateonthedifferent workingplatform,the spacingbetween upperandlower excavatorsshouldmorethan30m.
1.5Workers outsidethefoundationpit shouldnot throwrubbish insidethe pit,when transferthe toolsintothepitshould becareful.
1.6People restshould be far away fromtheside pit.
1.7Construction machineryshould obeyorders;all vehiclesdriving should be inaccordance withprescribedroutes strictlytopreventcrash.People should befarawayfromthe constructionmachineryif necessary.No peopleare allowedto standwithin theradius ofgyration of excavators ordoingother work.Notice theoperators andcan getclose toafter allowingif necessary.
1.8When drivingthe excavatorsand transportingcars,should becareful withthe electric line.Working underthe electricline isnotallowed;If workingat onesideofelectricline,the verticalandhorizontal distanceshouldnotlessthan
2.5mand4〜6m110〜220KV
1.9Adequate lightingfacilities shouldbe necessaryduringthenight working.Warning signsandguardrails shouldbe setin thedanger area.
1.10Vehicles pavedroad must be setduringtherainy season.Do thedrainage workto ensure thetraffic safety.
2.Environmental protectionor environmentalhealth managementmeasures.
2.1Measures toprevent dustand airpollution
2.
1.1Earthwork constructedby qualifiedtransportation unitsand signeda contractof carriage.Markthe companyenvironment requirementinthecontract.Arrange workersto cleanwheel atsiteentrance.And compactthesoilin caror coveredtightly.The highestpoint oftransporting soilshouldnot exceedcar50cm,the edgenot higherthan thecar.
2.
1.2Reserved backfillsoil usedintheproject shouldadopt thespray coveragemethod topreventdust.
2.
1.3Lay theprecast concretepanels onthe constructionpathway,set washing bay atexit positionandarrange workers.
2.
1.4Set asprinkler onsite andarrange workerto wateringaccordingtothe on-site situationtoprevent dust.
2.2Measure toprevent waterpollutionSet septictank oftemporary toilet,the pollutedwater passedthrough septictank,after precipitationthendischarged intomunicipal sewagepipeline.Measure toprevent noiseEstablisha sound management systemto controlman-made noise;
2.
3.2Monitoring theimplementation ofthe noisevalue^Construction SiteNoise MeasurementMethodsdaytime earthworkconstruction phasedoes notexceed75decibels at night doesnotexceed55decibels,andshouldbe testedoften6:00to22:00at daytime,22:00to6:00atnight
2.4On-site sanitationmanagement
2.
4.1Set workersresponsible forkeeping theon-site cleanand tidy.Ensure nowater onsite,thevehicles withoutthe sedimentout ofthesite.Every dayarrange workersto cleantheroad.
2.
4.2Arrange workersto cleanthe officearea,ensure nowaterandrubbish;
2.5Do thesupervision andinspection workofconstructionsite environmentalprotection.At thebeginning,middle andend ofeach monthcheck1time ofenvironment work.For theexistedproblems,we shouldrectify anddothepreventative work,andmakerecords andarchiving.
3.Measure toprevent disturbingThis project islocated nearthe FVhospital,to ensure the properconstruction,minimize theimpact onthesurrounding officeand living,the followingmeasure shouldbe formulated:
3.1Civilized constructionshouldbepromoted on-site,establish asoundmanagement system tocontrolman-made noise,minimize humanloud noise,enhance consciousnessof preventingnoise ofallworkers.
3.2Contact withthe relevantdepartment atany time,Adopt theircomments andproposal reasonably.We resolvethe relevantconstruction processarrangement andworkers operatingproblems attheproduction meeting.
3.3We shouldinspectthenoise duringtheearthworkregularly toensurethenoise belowthethreshold.
3.4For themanmade noisemanagementsystemestablishment,particularly,human beating,shouting mustbe eliminated,minimize noisenuisance.深基坑处采用钢板桩挡土,型钢做内支撑;浅基坑处才用钢板桩挡土其中,钢板桩需求量大,约为吨,保障供应是关键2300地下室施工面积大,要合理地划分施工区段,保证人,材,机日勺投入,以保证地下室施工按期
3.5完毕,地下室施工正值雨季,防雨和排水措施必须合理安排、布置,尽量减少雨季对施工的影响
41.Project View
2.Project name:RESIDENTIAL DEVELOPMENTMD3-
233.Project address:Vietnam HCMCDistrict7PHU MYHUNG.
4.Owner*:PHU MYHUNG Company
5.Design Unit:Sino PacificConsultancy Company
6.Supervision Unit:Sino PacificConsultancy Company
7.Main Contractor:China ConstructionEngineering CorporationS.E.A
8.General ConstructionView:
8.1Architectural functionand scale:This projectis residentproject,which buildingarea is181,286m
2.The superstructurearea is154,863m2and thebasement areais26,423m
2.The coveringarea ofitis26,479m
2.The towerbuilding includes:B1,B2,B3are24floor;C1,C2are21floor;D1,D2,E1,E2are16floor.The basementof this projectis1floor,which isparking lot.
8.2Level:±
0.000equals toabsolute elevation
2.300m;GF buildingground elevation:
1.15m;Basement bottomfloor level is-
3.150m;Original meanground level is-
0.2m.The totalheight ofbuilding:B1,B2,B3are
83.15m;C1,C2are
72.65m;D1,D2,E1,E2are
56.75m.
8.3Structure type:Building Bis frame-shear wallstructure.Building C,D,E areshear wallstructure.
8.4Foundation form:Pile capfoundation
9.Depth of excavation:Thisprojectnaturalfloorabsolute levelis
1.7^
2.8m,average excavation is
3.6m,the deepestexcavation is
8.0m.
10.Construction Difficulty
1.Basement structureconstruction isthe keyand thedifficulty ofthisproject,soft foundation,largearea,schedule istense,more equipmentand laborshouldbeinput.
2.Earthwork isthe keyof basementconstruction.The mostdepthofexcavationis-
8.0m.Averageexcavation depthis-
3.6m.We usesteel sheet pile toretaining andH-beam steelas supportsystemin deepfoundation.We usesteel sheetpile toretaining inshallowfoundation.The demandedquantityof steelsheetpileis verylarge ofwhichis10OOt,and weshould ensurethe supply.3The constructionarea of basement islarge,should dividethe constructionarea properly.Ensurethe workers,material andequipment inputandthecomplete thebasement onschedule.4The constructionofbasementmeet rainy period.We shouldarrange the waterproof anddrainageproperly toreduce theeffect ofrainyperiod.
二、施工布署、土方开挖前的准备工作1场地平整规定场地标高在
1.-
0.200m临时道路铺设,用项目的建筑垃圾回填,平整,压实,保证运土路线畅通;道路标高
2.happy valley约在-
0.200m基坑周围及基坑内部排水和临时供电布置基坑外侧设置明沟排水,水排至靠近河边处雨水管中;
3.基坑内侧设置明沟和集水井,通过水泵将坑内积水排到坑外排水沟,排出场外洗车池要在土方开挖前完毕,所有出场的运土车必须进过洗车,以保周围道路洁净整洁
4.测量控制网口勺布置
5.基坑观测点日勺布置采用两种方式进行观测第一种方式为测斜管观测,此方案正在设计中,
6.在年月日前将提交详细方案第二种方式为木桩观测,即在坡顶,坡脚和基坑底部设置木2023613桩,每半天观测木桩的沉降和位移状况I堆砂场地回填布置和规定
7.MD4土方开挖方案交底会
8.挖机司机和运土车司机安全培训
9.挖土工人安全培训
10.、土方开挖次序2浅基坑开挖次序第一施工段C2,El,D2,开挖至-
2.70m局部-
4.20m;第二施工段Cl,DI,E2,开挖至-
2.70m局部-
4.20m;第三施工段Bl,B2,B3,开挖至-
2.70m局部-
4.20m;深基坑电梯井处开挖次序第一施工段C2,El,D2,开挖至-
8.00/-
7.45m;第二施工段Cl,DI,E2,开挖至-
8.00/-
7.45m;第三施工段Bl,B2,B3,开挖至-
8.00m深基坑处构造完毕,钢板桩拔除后,浅基坑开挖次序第一施工段C2,El,D2,开挖至-
3.60m;第二施工段Cl,DI,E2,开挖至-
3.60m;第三施工段Bl,B2,B3,开挖至-
3.60m.
3、开挖设备和钢板桩施工设备土方开挖时拟采用台斗容量反铲挖土机,台斗容量反铲挖土机;深
60.7〜
0.9m
3120.5〜
0.3m3基坑开挖时,采用台台斗容量长臂反铲挖土机;辆运土车进行施工
30.5m34810m3钢板桩施工采用台打桩机进行施工其中台备用
512.Construction arrangement
1.Preparation beforethe excavation:
1.Site leveling:require sitelevelis-
0.200m.
2.Arrange andlay outtheexcavationroad,usetherubbish ofHappy Valleytobackfill,make flatandcompacting.Ensure thesmooth oftransporting thesoil.The roadlevelis-
0.200m.
3.The temporaryelectric arrangementof aroundfoundation andinside foundation.Install the ditchto drainoutsidethefoundation,thewateris drainedtothepipe nearthe river.Set uptheditchandsump pitinsidethefoundation.Drain thewaterofinsidefoundationtotheoutside foundationditchthrough waterpump.
4.Washing baymustbecompleted beforetheexcavation,all vehiclestransport thesoil outsidemustpass thewashingbayto makesuretheclean ofaround road.
5.Survey controlpointarrangement
6.Observation pointoffoundationarrangement.We usetwo methodsto dotheobservation:Thefirst method is inclinometercasing.This methodis beingdesigned,we willsupply thedetailed planbefore13/6/
2023.The secondmethodistimber pileobservation.We setthe timberpiles atthetop,base ofslopeandfoundation bottom.We observethe settlementand displacementof timberpiles2times aday.
7.MD4soil backfillarrangement andrequirement
8.Excavation methodmeeting
9.Safety trainingofexcavatorand dumpingcar drivers
10.Safety trainingofexcavation workers
2.Excavation steps:Shallow foundation excavation step:First stepC2,E1,D2excavate tothe-
2.70m part of them is-
4.20m;Second stepC1,D1,E1excavate to-
2.70mpart ofthem is-
4.20m;Third stepB1,B2,B3excavate to-
2.70mpartofthemis-
4.20m;Third stepB1,B2,B3Deep foundationElevator excavationstep:First stepC2,E1,D2excavate to-
8.00m/-
7.45m;Second stepC1,D
1.E2excavate to-
8.00m/-
7.45m;Third stepB1,B2,B3excavateto-
8.00mDeep foundationstructure completed,after pullingoutthesteelsheetthe shallow5foundation excavationstep:First stepC2,E1,D2excavate to-
3.60m;Second stepC1,D1,E2excavateto-
3.60m;Third stepB1,B2,B3excavateto-
3.60m.
3.Excavation equipmentandsteelsheetpileconstruction equipmentUse6sets
0.7~
0.9m3excavator,12sets
0.3~
0.5m3excavators whenstart theexcavationwork.When constructingthe deepfoundationexcavation,use3sets
0.5m3long-arm excavatorsand48sets10m3trucks.Use5sets sheetpile driverwhen constructingthesteelsheet piles1reserved
三、施工操作工艺、土方开挖工程1完毕测量控制网的设置,包括控制基线、轴线和水准基点场地平整进行方格网桩的布置和标高
1.1测设,计算挖填土方量,对建筑物做好定位轴线日勺控制测量和校核;进行土方工程的测量定位放线,并经检查复核无误后,作为施工控制的根据合理安排机械进出场和土方运送线路,保护好临时供水供电线路
1.2机械挖土分四大步进行
1.3第一步挖至-
2.70m(分两层开挖第一层开挖至-
1.20m,第二层开挖至-
2.70m);保留部分回填,用做修路第二步局部开挖至(在标高处设置宽度的平台,小型挖机在此平台上,开挖至-
4.20m-
2.708m)采用“接力挖土法”,即一台大挖机在基坑边-处,一台小型挖机在基坑内-
4.20m
1.20m-
2.70m,宽度为的平台上,小型挖机可开挖至同步转土给大挖机,由大挖机装车,再由车运至弃8m1-
4.20m,土地点机械开挖不到之处,再配以人工开挖、找平;第三步在电梯井周围打钢板桩,做支撑,然后采用长臂挖机由开挖至基底应预留-
4.20m-
8.00m土层人工清底找平,从而防止超挖和基底土遭受扰动;20cm第四步在完后电梯井基础构造,拔除周围钢板桩后,将底板剩余部分开挖至土方开挖完-
3.60m毕土方开挖的平面图及剖面图详见土方开挖施工图当第一,二步土方开挖完毕后,在边坡顶部,中部,底部及基坑内侧设置基坑观测点,测量人员
1.4每半天测量一下,检查基坑边坡稳定性当土方开挖完毕后,测量人员要立即放出基底边线,进行基槽验收基槽验收合格后开始由人工
1.5挖除预留土体,用尺量好原则尺杆,随时校核基底标高并在清理好的基底上放好基坑20cm50cm I边线基槽平整好后,应立即进行垫层等下道工序施工在软土地基,进入基坑要铺设道路坑面、坑底排水系统要保持良好
1.6防止地下水及雨水浸泡坑底,沿基坑边外预留宽临时排水沟,且在转角处设临时积水
1.730cm50cm坑,每一坑内配置一台抽水泵,随时抽出坑内积水为防止地表水进入基坑,在基坑外围靠基坑
0.5m处用四孔砖砌筑宽,高拦水坝,以防雨水等流入基坑坡面采用彩条布覆盖防止雨100mm300mm水冲刷、土方回填工程2回填前应清除基底上草皮、杂物、树根和淤泥,排除积水,并在四面设截水沟,防止地面水流入
2.1填方区或基坑,浸泡地基,导致基土下陷宜优先采用回填砂,并清除其中有机杂质和粒径不不大于的颗粒,含水量应符合规定
2.250mm回填土分层摊铺和夯压实,每层铺土厚度和压实遍数根据土质、压实系数和机具性能而定
2.3回填时从最底处开始,由下而上整个宽度水平分层均匀铺填土料和扎实深浅坑相连时,先填深坑,
2.4填至与浅基坑相似标高后与浅坑全面分层填夯如分段填筑,交接成阶梯形,梯形的高宽比一般为1分层交接处错开,上下层接缝距离不不不不大于墙基及管道回填在两侧用细土同步回填扎2o LOm实人工回填打夯前将填土初步整平,打夯按一定方向进行,一夯压半夯,夯夯相接,行行相连,两
2.5遍纵横交叉,分层打夯扎实基槽及地坪时,行夯路线由四边开始,然后再夯向中间用蛙式打夯机等小型机具扎实时,打夯之前对填土初步整平,打夯机依次夯打,均匀分开,不留间隙回填土每层填土扎实后,应按规范规定进行环刀取样,测出干土日勺质量密度;抵达规定后,再
2.6进行上一层的铺土。