Precast phab ntsa vaj huam sib luag pwm yog tsim los ntawm peb cov ntaub ntawv: steel, aluminium alloy, thiab cov ntaub ntawv sib xyaw. Txhua yam khoom muaj cov yam ntxwv sib txawv thiab daim ntawv thov scenarios. Hlau pwm (hardness HRC50-60) yog cov yam ntxwv ntawm lub zog siab thiab zoo hnav tsis kam, haum rau ntau lawm; aluminium alloy pwm (qhov ceev 2.7g / cm³) yog lub teeb yuag thiab muaj cov thermal conductivity ceev, haum rau kev demolding sai; Cov khoom siv sib xyaw pwm (lub zog tensile 300-500MPa) muab lub teeb yuag thiab corrosion tsis kam, ua rau lawv tshwj xeeb tshaj yog tsim rau cov khoom siv zoo li qub. Qhov kev xaiv ntawm cov ntaub ntawv no ncaj qha cuam tshuam rau kev ua tau zoo (nce 20-30%), pwm lub neej (steel tuaj yeem ncav cuag ntau dua 100,000 lub voj voog), thiab cov khoom tiav tiav (flatness yuam kev tsawg dua lossis sib npaug li 1 hli).
Precast pob zeb phab ntsa pwm yog tsim los ntawm ntau yam ntaub ntawv, feem ntau nrog rau cov yas thiab fiberglass.
Cov pwm yas yog cov pheej yig, muaj qhov yooj yim, thiab tuaj yeem hloov mus rau qee qhov deformation. Lawv lub ntsej muag du ua rau cov khoom siv precast nrog lub ntsej muag zoo nkauj. Raws li kev siv ib txwm, pwm ua los ntawm fiberglass tuaj yeem siv tau rau ntau xyoo. Txawm li cas los xij, nrog kev siv ntau zaus thiab tsis zoo ib puag ncig, lawv tuaj yeem ntsib qee qhov hnav thiab kev laus, ua rau lub neej ntev li ntawm 3-5 xyoos.
Fiberglass pwm muaj zog dua, zoo dua corrosion kuj, thiab tuaj yeem tiv taus siab dua thiab cuam tshuam. Lawv lub neej ntev dua, feem ntau ncav cuag 5-8 xyoo lossis ntev dua. Txawm li cas los xij, lawv cov nqi siab dua li cov pwm yas.
Thaum xaiv precast qhob phab ntsa pwm, kev xaiv cov khoom siv yuav tsum raug txiav txim siab raws li qhov xav tau tiag tiag, pob nyiaj siv, thiab kev siv ntau zaus. Cov ntaub ntawv pwm sib txawv muaj lawv tus kheej cov yam ntxwv, ua tau raws li cov neeg siv khoom sib txawv hauv cov xwm txheej sib txawv thiab muab kev ruaj ntseg rau kev tsim cov phab ntsa precast.