船体专业英语.doc

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1、SectionFSuperstructuresandAccommodationThesuperstructureisthatpartoftheship'sstructurebuiltabovetheuppermostcompletedeckandisthefullwidthoftheship.Deckhousesaresmallerstructuresnotextendingthefullwidthandoneormorestoreyshigh.Theymaybebuiltontothesuperstructureorattheba

2、seofmasts,etc.Theconstructionofsuperstructuresanddeckhousesusesframes,plating,girdersandbracketsinasimilarmannertothehull,butofsmallerseantlings・However,superstructuresextending15%oftheship'slengthareconsideredtocontributetotheIongitudinalstrengthoftheship.Assuch,theym

3、usthaveequivalentscantlingsandstrengthtothemainhull.Themostforwardsectionofthesuperstructureisknownasthe'forecastle1.Anysectionofthesuperstructurearoundthemidshipsregionoftheshipisreferredtoasa'bridgestructure1.Thedeckareaaftisknownasthepoop1andanysuperstructurelocated

4、aftislikewiseknown.Araisedquarterdeckisaweatherdeckextendingforsomeportionoftheship'slengthfromaftandispositionedabovetheupperdeck.Mostmodernshipshavemostofthesuperstructureandaccommodationsituatedaftabovethemachineryspace.Thesuperstructureanddeckhousesusuallytotalfour

5、orfivestoreys.Themajorpartinthisspace,exceptforthatlosttothemachinerycasing,isusedforcrewaccommodation・ForecastleAllshipsmustbefittedwithaforecastleoranarrangementtoprovideaminimumbowheight,asdefinedinclassificationsocietyrules.Itisusualtofitforecastles,andwherethisisd

6、onetheymustextendfromthestemadistanee0.07Laft(whereListhefreeboardlength).Thesideplatingoftheforecastle,beingacontinuationoftheshellplating,isthickerthantheendplating.Adequatearrangementsforstiffeningoftheforecastleplatingmustbeprovided・BridgestructureWhereabridgestruc

7、tureexceeds15%oftheship'slength,thesideplatingthicknessmustbeincreasedby25%abovethatofothersuperstructures.Aheavilyplatedbridgefrontisrequiredwiththeafterendplatingsomewhatlighter.Stiffescantlingswilllikewisebeincreasedattheforwardendandreducedattheafterend.Webframesor

8、partialbulkheadsmustbefittedtosupportstructuresabove,particularlytitthecornersofdeckhousesabove・Housetopsordecksinway