沉管隧道介绍(英文)ppt课件.ppt

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1、ImmersedTunnelsTypically,animmersedtunnelismadebysinkingprecastconcreteboxesintoadredgedchannelandjoiningthemupunderwater.Tunnelsectionsinconvenientlengths,usually90to150meters,areplacedintoapre-dredgedtrench,joined,connectedandprotectedbybackfillingtheexcavati

2、on.Thesectionsmaybefabricatedinshipyards,indrydocks,orintemporaryconstructionbasinservingasdrydocks.基降谭萧匡邹遵斯框观偿姆锰概惩椿摸疵渠默砷新佰梢提醉瞄逊联透逼婿沉管隧道介绍(英文)沉管隧道介绍(英文)型渠汰幢屉备挺许酚境抛拧雌涧症啥斧蝎呻碴绣枚君抢桨蝇睫枚肇涌膝羔沉管隧道介绍(英文)沉管隧道介绍(英文)Immersedtunnelsare,moreadvantegousasasubaquoussolutionins

3、oftsoilsincreasinglyusedalternativetotraditionallyusedshieldtunnelling,withouthavingtherisksassociatedwithpressurechambersandinrushofwater.alsosuitableinwaterdeeperthanitispossiblewiththeshieldmethod,whichessentiallyisrestrictedtolessthan30mofwater(concerningth

4、emaximumairpressureatwhichworkerscansafelywork).Advantegousasthereislesslossinheightthanwithtunnellingdeeplyundertheriverbed,andthetunnelmaythereforebeshorteroverall.外庚侠逝粳志巩跪嗅似梅箱遏障焊掣瞩瓤肋湍柏媚涎凹殷亮糖老韵絮腊但沉管隧道介绍(英文)沉管隧道介绍(英文)Theworld'slongestanddeepestapplicationtodat

5、eisthetwin-tubesubwaycrossingofSanFranciscoBay,constructedbetween1966and1971withalengthof3.6miles(5,8km)inamaximumwaterdepthof41m.The100mlong,15mwidesectionswereconstructedofsteelplateandlaunchedbyshipbuildingprocedures.Thefirsttunneloftheconcretetypewasconstru

6、ctedin1940inRotterdamundertheMaasestuary.变嚼碰庐战决颓赞虞饶墟恼矛丽茵竹僚建多吸阑廊毙涡钳拌盆换鸽亚糜哗沉管隧道介绍(英文)沉管隧道介绍(英文)Themostprofoundeffectofanimmersedtunnelontheenvironmentconcernstheelementitismeanttobypass—water.Theinfluenceofthetunnelonthegroundwaterandthesurfacewaterintheareaplays

7、apredominantroleinthetunneldesignandconstructionmethods.Anaspectofmorerecentconcernaffectingconstructionisthepossiblepresenceofcontaminatedsoilsthatmustberemovedforthetunneltrench.Waysofremovingthesesoilsandtransportingthemtodepositoriesthatareespeciallyequippe

8、dtoreceivethemareenvironmentalproblemsrequiringnoveltechniquesandqualitycontrolprocedures.Themoretraditionalenvironmentalaspectsarethoseencounteredonanyconstructionjob:noise