Roj hmab ntiv nplhaib khi tshuab yog txhua lub tshuab khi, siv tus nqi qis kawg nkaus, yooj yim, yooj yim rhuav tshem, tuaj yeem rov ua dua qub kev siv; Haum rau cov chaw haujlwm me lossis cov rooj sib tham dav dav cov ntawv sau, nrog rau cov chaw luam ntawv me. Lub tshuab khi muaj ob hom kev khi, uas yog ib qho loj ntawm tus yam ntxwv ntawm nws, ntxiv lossis rho tawm nplooj ntawv yooj yim, tuaj yeem paub cov ntawv nyeem 360 degrees, diameters ntawm aprons, txiav txim siab cov ntawv khi tuab, txoj kev luam ntawv no thiab khi vim qhov loj ntawm lub sev, xim thiab npog xim xaiv yog qhov loj dua, yog li cov collocation muab cov nyhuv yog qhov sib txawv, cov cim txawv, qhov kev zoo nkauj yog dav.
Nkag qhov nyob rau hauv cov nplooj ntawv yuav tsum tau khi thiab muab lawv tso rau hauv prefabricated lub voj voog yas. Nws qhov txiaj ntsig loj tshaj yog: cov ntawv nyeem tau yooj yim, yooj yim ntxiv lossis tshem tawm cov nplooj ntawv, cov khoom siv qis ntawm cov khoom siv, yog lub ntiaj teb cov ntaub ntawv sau ntau tshaj plaws, tab sis tsis muaj lub luag haujlwm zoo.