Vim li cas cov khoom siv ua vaj tse xav tau kev puas prestovering?
Kev siv ua vaj tse cov qauv ua haujlwm nrog cov kab nrib pleb hauv kev ua haujlwm ib txwm muaj. Txhawm rau kom tsis txhob muaj kev nthuav dav ntxov ntawm cov kab nrib pleb hauv cov khoom siv hluav taws xob, peb yuav tsum ua kom tag nrho cov khoom siv hlau thiab cov khoom siv compressive ntawm cov khoom siv cov khoom. Peb yuav tsum sim ua kom txo qis tensile muaj kev ntxhov siab ntawm cov khoom siv los ntawm kev thov sab nraud ua ntej cov pob zeb ua ntej cov kev pabcuam thauj khoom, lossis txawm muab tso rau hauv lub xeev compressive. Lub Xeev Prestateded yog li tsim tau siv los txo lossis offset lub tensile kev ntxhov siab siv ntau dua compressive lub zog ntawm cov pob zeb ua kom tawg, yog li kom ncua cov pob zeb tawg hauv thaj chaw tensile. Cov qauv ua los ntawm cov pob zeb prestressed tseem hu ua prestresshed txhawb kev txhawb nqa qhob vim lawv ua tiav prestress los ntawm nrag hlau tuav.
Qhov zoo thiab qhov tsis zoo ntawm prestressed qhob vaj tse
Qhov Zoo
(1) Cov kev tawg ua kom zoo thiab muaj kev nruj. Daim ntawv thov ntawm Prestress mus rau cov khoom sib xyaw ua ke qeeb cov tsos ntawm cov nrib pleb. Nyob rau hauv qhov kev txiav txim ntawm kev pabcuam thauj, cov khoom siv yuav tsis tawg lossis cov kab nrib pleb yuav raug ncua, yog li txhim kho cov khoom siv nruj thiab nce qib zuj zus ntawm cov qauv.
(2) Txuag cov ntaub ntawv thiab txo qis kev tuag taus. Txij li nws cov qauv yuav tsum tau siv siab - cov ntaub ntawv muaj zog, txuag cov hlau thiab pob zeb ua kom zoo, thiab txo qhov hnyav} qhov hnyav ntawm tus qauv. Nws tau pom tseeb zoo rau loj -} ntev thiab hnyav {{7} log qauv.
(3) Nws tuaj yeem txo cov yuam kev ntsug thiab tus thawj coj ntawm lub teeb meem kev ntxhov siab ntawm cov nqaj hlau nplaum. Tus nkhaus steel tuav (bundles) ntawm prestressed qhob nqaj nyob ze rau ntawm cov pob zeb Qhov no yog qhov zoo kom txo cov web tuab ntawm lub nqaj kom tus kheej- qhov hnyav ntawm lub ntsej muag ci ntsa iab tuaj yeem txo qis dua.
(4) Txhim kho qhov ruaj khov ntawm cov neeg ua ke compressive. Thaum qhov ntev - rau {{3} Txoj kev sib piv ntawm lub siab, nws yog qhov yooj yim khoov tom qab tau txais rau qee yam siab, ua rau poob ntawm kev ruaj khov thiab kev puas tsuaj. Yog hais tias prestress yog thov rau cov khoom siv ua vaj tse sib luag, lub zog ntev - bearing steel cov ceg yog ncab nruj nreem; Tsis yog tsuas yog tus kheej stage tau cov neeg lawv tus kheej tsis yooj yim los khoov, tab sis kuj cov pob zeb nyob ib puag ncig tuaj yeem pab txhim kho kev puas tsuaj.
(5) txhim kho cov qaug zog qaug zog ntawm tus tswvcuab. Vim tias kev hloov pauv kev ntxhov siab los ntawm kev thauj khoom lossis tsis siv hluav taws xob thaum siv me me, uas tau txais kev qaug zog tuaj yeem hloov kho, uas tau txais txiaj ntsig zoo rau cov qauv kev ua kom zoo.
(6) Prestovinging tuaj yeem siv los ua cov txhais tau tias ntawm kev sib txuas cov txheej txheem txheej txheem kev txhim kho ntawm cov tshuab tshiab thiab cov qauv kev tsim kho rau loj-} span lug.
Tsis zoo
(1) Cov txheej txheem yog cov txheej txheem sib txawv thiab muaj siab -} yuav tsum tau ua tau zoo, yog li ib pab neeg tshaj lij yog xav tau.
(2) qee cov cuab yeej tshwj xeeb yog qhov yuav tsum tau, xws li tensioning machinery thiab grouting khoom. Lub pre - txoj kev nro yuav tsum muaj kev sib tw taug kev; Tus tshaj tawm - cov txheej txheem
(3) Tus nqi kev tsim kho ntawm prestressed vaj tse yog qhov tseem ceeb, thiab tus nqi ntawm cov phiaj xwm nrog qee yam me me ntawm cov khoom siv.
(4) Cov kws tshaj lij lub ntsej muag yog qhov nyuaj rau kev tswj hwm. Nws nce nrog kev nce ntawm cov pob zeb ua, ua rau tus choj lawj kom tsis xwm yeem.
(5) Nyob rau hauv high - kev mob siab rau tom qab prestressing yuav txo qis, yog li muaj kev nyab xeeb kev nyab xeeb, yog li muaj kev nyab xeeb kev nyab xeeb, yog li muaj kev nyab xeeb kev phom sij hauv kev tsim kev tua hluav taws.
Dab tsi ua ntej - tensioning thiab tshaj tawm - tension hais txog? Lawv tau tsim tsa li cas?
Tus qauv ua vaj tse prestressed yog cov qauv uas ua ntej - ntxhov siab ua ntej cov khoom siv tau siv. Prestress yog tsim los ntawm kev nro siab- lub zog steel tuav lossis xaim. Muaj ob txoj kev nro:
(1) Ua ntej - tensioning. Ntawd yog, cov hlau tuav tau nruj ua ntej, thiab tom qab ntawd pob zeb ua yog hliv. Thaum cov pob zeb ua tau txog lub zog tshwj xeeb, qhov xaus ntawm cov hlau tuav tau so. Ua ntej qhob yog poured, prestressed tev, muaj los ntawm cov hlau hlau stands lossis anchored rau cov kev ntxhov siab thiab anchored rau lub piers ntawm ob qho kawg ntawm cov neeg taug kev ntawm anchors. Tom qab ntawd, cov formwork cov kab hlau, thiab feem yog ntsia, thiab cov qhob yog hliv thiab kho tau. Thaum cov pob zeb ua tau txog lub zog tshwj xeeb, lub zog prestressed ntawm Piers ntawm cov pob zeb prestring, tsim ua ntej ua ntej ua ntej- compression kev ntxhov siab. Lub pre - cov txheej txheem tensionous thaum siv ib qho ntev tshaj plaws pedestal, thiab ntev tshaj plaws tuaj yeem ua tau ntev {}} kab txoj kev.
(2) post - txoj kev nruj. Ntawd yog, nchuav cov pob zeb ua ntej, thiab thaum nws mus txog lub zog tshwj xeeb, nro cov hlau sib txuas los ntawm cov pob zeb tshwj xeeb ntawm cov pob zeb tshwj xeeb hauv cov pob zeb tshwj xeeb thiab thauj tog rau nkoj ntawm ob qho kawg. Qhov kev coj ua dav dav yog thawj zaug nruab cov casing, thiab qhov chaw rau tus posts- qhov tsis muaj ntaub ntawv prestressed, thiab tom qab ntawd muab cov formwork thiab qhib pob zeb. Tus prestressed tendons tuaj yeem tso rau hauv lub ntsej muag ua ntej lossis tom qab. Tom qab cov pob zeb ua kom tau lub zog xav tau, lub zog prestressed tau nro rau qhov kev ntxhov siab uas yuav tsum muaj nrog ib jack thiab anchored ntawm ob qho kawg ntawm lub nqaj. Kev ntxhov siab tshaj plaws yog kis tau rau cov qhob ntawm cov khoom los ntawm cov hlau pob ntawm ob qho kawg. Txhawm rau tiv thaiv cov prestressed torrosion los ntawm corrosion thiab rov qab ua kom muaj kev sib raug zoo ntawm prestressed teej tug thiab cov pob zeb ntawm prestressed teej thiab cov casent yuav tsum muaj nrog cov cement slurry. Ntxiv rau nws cov anti {{10} Cov nyhuv corrosion, Maas Slurrry kuj tseem muaj zog rau kev rov ua txoj kev sib raug zoo ntawm cov testressed testons thiab pob zeb. Txhawm rau pab txhawb kev tsim kho, qee zaum tsis- Cov ntaub ntawv tiv thaiv corrosioning tuaj yeem siv rau saum npoo ntawm prestressed tev thiab qhwv nrog cov tsiaj yas lossis cov ntawv yas.
