七層建筑PVC-U排水立管試驗研究.pdf

1、湖南大學碩士學位論文七層建筑PVCU排水立管試驗研究姓名：張萬慶申請學位級別：碩士專業(yè)：市政工程指導教師：袁玉梅柯水洲20070508碩士學位論文IIIAbstractSevenflosPVCUdrainingwatertestequipmentweretooktheexperimentalstudyobject.MainwatertankinSevenflosdisgedwatertothePVCUdrainagesystemfsim

2、ulatingcentralizedflowinthemostunfavablesituationofthey.Theexperimentusedthepressuretransmittinginstrumenttosurveytheinstantaneousvaluethemaximumvalueofpressurechangeindrainagesystemusedgaugingglasstosurveythewaterheight

3、changevaluearoundturningonwaterinwatersealofUtrap.Studymainlyconductedthreefollowingaspects:FirstlyPVCUdrainingpipeinternalpressureundulationresearch.Theexperimentshowedthatthepressureinthedrainagesystemwaschangedfrequen

4、tlyapproachedirregularsinecurvewhichwasonekindoffluctuationpressure.Insomeshttime(finstanceseveralseconds)thisfluctuationpressurepulsatedaboutthemeanvalue.Butalongwiththedrainingtimeextentedthefluctuationpressurechangedf

5、requentlytheprecisepulsationmeanvaluewasextracteddifficultlyinthedrainingprocessonlywasestimatedfsomeshttimefromtherealpressuregraph.SecondlythethoughstudyproceededfthelosswatersealofUtrapinthePVCUdrainingpipeunderthesta

6、ticevapationdynamicdrainingattemptedtocarryonthemicroscopictheeticalanalysis.ThemajfactofUtrapstaticevapationwerethetemperaturetherelativehuitythewinterevapationlosswassmallerthanthesummer.ThemajfactofUtrapdynamicdrainin

7、gwerepositivepressuresplatteringnegativepressuresuctiontheychangedinturnthefrequencywasveryquick.WaterwasdisgeddifficultlyunderpositivepressurefromupperlimbofUtrapwhichwasinputjointofdrainingappliancedrainingpipe.Butthep

8、ositivepressurecouldcausefierceundulationofUtrapwaterpressureinthedrainagesystemwatercouldflowfromtheUtraplowerlimb.Inonedrainingprocesstheinnumerablepressurefluctuationcausedthenegativepressurewhichcausedsuctionthenwate

9、rofUtrapflowedthedrainingbranchpipeitwastheprimaryfactofthedynamicUtraplosed.Meoverthewaterlosesfthefluctuationpressureweremuchsmallerthanthosefthepulsationmeanvalue.Thereasonpossiblyhadtwo:Firstthenegativepressuresuctio