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ID:48552517
大小:15.73 KB
页数:4页
时间:2020-01-27
《顶管法施工方案(英文版).doc》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、MethodStatementforPipeJacking1.ConstructionofPitsThejackingpitwithadimensionof6mx5clearopeningwithdepthof250mmbelowinvertlevelofthesteelpipe.Thefloorwillbeleveledby100mmthickconcreteblindingfixingtowIbeams(1.5mx15cm)inthecenterofthepitforfixingjackingframe.2.Install
2、ationofJackingFrameAftertheconstructionofdrive,thejackingrigwillbeloweredintothepitandadjusttothecontrollineandlevel.Therigwillbeusedonthiscontractconsistoftwonumberofhydrauliccylinderswithacapacityof150toneachtogiveatotaljackingforceof300tons.Therigwillhaveguidedra
3、ils,pushingplateandbaseplatetohydraulicpowerbackwithcontrolunit.Thehydraulicsystemwillrunthroughadieselengineinstalledthetopofthepit.Therigwillinstalledtothecorrectlineandlevelandcheckbytheconsultantinrespecttolevelandalignment.3.ThrustWallConstructingaconcreteblock
4、behindthebaseplateoftherigtoadimensionof2x1.5x0.5mwillbeprovidedtotakeanddistributethejackingload.4.PipeJackingOperationAsteelshieldisusedatthefrontofthepipetoaccommodatetheminerandtoallowforsteeringofthepipejack.Thesoilwithintheshieldismanuallyexcavatedandloadedint
5、oawheelskipfortransporttothepitbottom.Theminerdoesnotdigoutsidetheshield(bothinfrontandradically)andthefront,orcuttingedge,oftheshieldisalwayskeptburiedintheface,sostabilityismaintained.Theshieldisthususedtotrimtheexcavationtothesizeofthepipethusminimizingthepotenti
6、alforsettlementofthegroundabovethepipejack.Inthepitbottom,theskipishoistedtothesurface,emptiedandreturnedtotheusedtoloosenitpriortodigging.Theexactdiameterofshieldwillbeselectedtosuitthepushingpipes.Asexcavationcontinues,theshieldisjackingforwardusingtwohydraulicjac
7、ksthrustingfromthebackwall.Whentheshieldisburied,thejacksareretractedandthefirstsleevepipeloweredontotherails.Thisinthenpusheduptotheshieldandexcavationcanthencontinue.Whenthesleevepipeispushedhome,thehydraulicjacksareretractedandtheservices(lighting&ventilation)dis
8、connected.Thenextsleevepipeisloweredontotherailsandtheservicesreconnectedandthecyclerepeateduntiltheshieldispushedintothereceivingpitandth
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