投标中海堤施工方案.docx

投标中海堤施工方案.docx

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1.1海堤施工方案RevetmentConstructionProposal

1.1.1主要施工内容MainConstructionWorks

海堤施工主要包括西侧海堤，长约285m；东侧海堤，长约129.4m；南侧海堤，长约519m。

其断面结构形式均为300KG以内开山石作为堤心料，内侧采取二片石、倒滤层、土工布的护坡形式，外侧采取碎石垫层、护面块石的护坡形式。

根据海堤结构形式，结合其底高程的变化，西侧、东侧堤心石施工考虑全部陆上抛填；南侧堤心石施工考虑陆上和水上抛石相结合施工的方法。

海堤施工计划14个月完成，平均每月施工强度约18500方。

Therearethreerevetmentstobeconstructed,thatis,west,east&southrevetment,whicharearound285m,129.4m&519mrespectivelyinlength.Alloftheserevetmentsareconstructedwithquarrystonecorelessthan300kgservingasrevetmentcorematerials,andtheinnerslopeprotectionisconstructedwithIntermediatestone,mixedfilterlayerandgeo-textile,whiletheouterslopeprotectionisconstructedwithstonecushionlayerandarmorstone.Inconsiderationoftherevetmentstructureandbottomelevationranges,thebackfillingofquarrystonecoreofthewest&eastrevetmentistobeperformedinthemannerofonshoreconstruction,whilethebackfillingofquarrystonecoretothesouthrevetmentistobeexecutedviathecombinationofonshoreconstructionandoffshoreconstruction.Therevetmentisproposedtobecompletedin14monthswithmonthlyconstructionstrengthof18,500m3.

1.1.2施工顺序ConstructionSequence

西侧海堤施工→东侧海堤施工→南侧海堤施工

WestRevetment→EastRevetment→SouthRevetment

1.1.3施工流程ConstructionFlow

基槽开挖→堤心石填筑→海堤内侧护坡施工→护脚施工→外侧护坡施工

Foundationexcavation→quarrystonecorefilling→innerslopeprotection→toeprotection→outerslopeprotection

1.1.4施工方法ConstructionMethod

A．基槽开挖FoundationTrenchExcavation

海堤的基础表层为淤泥质粘土，需要进行基槽开挖。

陆上部分采用反铲开挖，自卸车运至抛泥区。

水上部分考虑与疏浚工程相结合，采用抓斗式挖泥船进行基槽开挖，1000方泥驳运输至附近业主指定的海域进行卸驳。

Thefoundationsurfaceofrevetmenttobeexcavatedissiltyclay.Onshoreexcavationistobecarriedoutwithbackhoeandtheexcavatedmaterialsaretobetransportedtothedisposalareabydumpers;offshoreexcavationistobecarriedoutbygrabdredger,1000m3hopperbargewillbeusedtotransportexcavatedmaterialstodesignatedseadisposalarea.

B．堤心石填筑FillingQuarryStoneCore

堤心石填筑考虑陆上抛石和水上抛石相结合施工的方法。

陆上抛石是石料直接运输至抛填地点进行抛填，水上抛石是石料运输至临时码头后装驳，方驳运到施工现场，方驳上反铲进行抛石。

东侧、西侧海堤采取陆上推进施工从堤根开始，堤心石填筑直接填筑，海堤施工时每隔50m处设置会车平台。

南侧海堤堤心石抛填分两步施工。

第一步粗抛，方驳上反铲抛填，考虑长臂反铲上方驳理坡；第二步由陆上推进，自卸车填筑，推土机碾压，反铲或长臂反铲修坡（结合反铲作业半径，海堤底高程为0m以上施工段考虑普通反铲修坡，0m以下施工段考虑长臂反铲修坡，并潜水组配合修坡）。

Back-fillingofquarrystonecoreistobecompletedviarip-raponshore&offshore.Fortherip-raponshore,stonematerialsaredumpedafterbeingtransportedtothesite.Fortherip-rapoffshore,stonematerialsareshiftedtothetemporaryjettyfirstly,thentransportedtothesitebyflatbarge,andlastlydumpedtothesitebybackhoeonthebarge.Duringtheconstructionofeast&westrevetment,commencetheconstructionfromtherevetmenttoeandfromtheonshore,back-fillcorestoneandarrangeavehiclemeetingplatformeveryother50m.Theconstructionofsouthrevetmentistobecompletedintwosteps.Inthefirststep,dumpstoneroughlybybackhoe+flatbarge;inthesecondstep,performconstructionfromonshore,fillingwithdumper,compactingwithbulldozer,trimmingtheslopewithbackhoeorlong-armbackhoe.Takingintoaccountofthebackhoe’soperationradius,fortheconstructionoftrimmingslope,usenormalbackhoefortherevetmentwithbottomelevationabove0m,anduselongarmbackhoefortherevetmentwithbottomelevationunder0mwiththehelpofdiverteam.

Fig4.9DumpingStonewithBackhoe+FlatBarge

Fig4.10PictureofFillingQuarryStoneCore

C．内侧护坡施工InnerSlopeProtection

考虑内侧护坡需在厂区回填前完成，因此每段海堤堤心施工完成之后，需要先完成内侧的护坡作业，计划采用水陆相结合的施工工艺，自卸车运输石料至海堤堤顶，反铲进行抛填并理坡，反铲作业范围外的区域，考虑采用50T履带吊上方驳，水上吊抛网兜；

Consideredthattheinsideslopeprotectionworkingmustbecompletedbeforebackfillingofstationarea,theinsideslopeprotectionisrequiredtobecompletedfirstaftercompletionofdikecoreconstructionofeachsectionofseawall,forwhichitisplannedtoadoptonshoreandoffshoreconstructiontechnology,i.e.,dumpersareusedtotransportstonematerialtocrestoftheseawallandbackhoeareusedtoconductriprappingandslopemakinganditisplannedtoriprappingwiththe50tcrawlercrane+flatbargetoliftthesteelwirebagintheareabeyondtheworkingscopeofthebackhoe.

CrawlerCraneLiftingandDumpingofStone

D．土工布铺设LayingofGeotextile

土工布运至现场就位，听从指挥由陆上往水下摊铺，施工尽量选在低潮时进行，水下施工时派潜水员水下配合。

土工布要求紧贴混合倒滤层，并留有一定的余量，以平衡土工布收缩和倒滤层基面凹凸不平产生的误差。

土工布铺设完毕后，应及时进行其上部袋装碎石压坡施工，以防被水流和波浪冲开，同时避免受太阳紫外线照射，使其老化变脆，强度降低，影响土工布铺设质量。

Aftergeo-textilebeingmobilizedtothedesignatedsite,laythegeo-textilefromonshoretooffshore.Theplacementofgeo-textileshallbeperformedduringlowtideasmuchaspossibleandtheunderwaterlayingshallbedonewiththehelpofdivers.Thegeo-textilesshallbelaidcloselytothemixedfilterlayerwithcertainspace,soastominimizethedeviationcausedbytheshrinkageofgeo-textileandtheunevensurfaceofmixedfilterlayer.Uponthecompletionofplacinggeo-textile,baggedcrushstoneonthegeo-textileshallbelaidtimely,incasethatthegeo-textileiswashedawaybywaterflowandwaves.Meanwhile,thealready-laidgeo-textileshallbeprotectedfromthesun'sultravioletrays,sincethattheexposureundersunshinemaycausethegeo-textileaging,brittleandstrengthreducing,andfurtheraffectthegeo-textile’squality.

E．海堤护脚施工ToeProtectionofRevetment

海堤护脚施工待内侧护坡施工完成后开始，反铲装网兜，25T汽车吊吊网兜装车，自卸车运输至海堤堤顶，50T履带吊进行吊抛。

Aftertheinnerslopeprotectioniscompleted,commencetheconstructionofrevetmenttoeprotectionviathemannerfromonshore.Putstonesintosteelwirebagsbybackhoe,liftthemwith25Ttruckcraneandtransporttositebydumperandthendumpthemby50Tcrawlercrane.

F．外侧护坡施工OuterSlopeProtection

外侧护坡施工考虑在护脚块石完成后开始，采用反铲直接抛填和履带吊吊抛相结合的工艺进行。

反铲作业部分，3m3装载机装块石，自卸车运输至施工场地，反铲直接抛填理坡；反铲作业半径以外的区域，反铲装块石入网兜，25T汽车吊装20T自卸车，运输至现场后，由50T履带吊进行吊抛。

Theoutsideslopeprotectionwillbestartedafterthecompletionofthetoeprotectionstone,withthetechnologyofcombiningthedirectriprappingwithbackhoeandcrawlercrane.Forthebackhoeworkingpart,the3m3loadershallbeusedtoloadstoneandthedumpershallbeusedtotransportthemtosite,andthebackhoeshallbeusedfordirectriprappingandslopetrimming;Intheareabeyondtheworkingradiusofthebackhoe,putstonesintosteelwirebagsbybackhoe,liftthemwith25Ttruckcraneandtransporttositebydumperandthendumpthemby50Tcrawlercrane.