Prefabricated ncaj qha- faus rwb thaiv tsev kav yog tsim los ntawm cov kav hlau ua haujlwm, polyurethane rwb thaiv tsev txheej thiab siab - ntom polyethylene txheej tiv thaiv kav, uas yog tsim nyob rau hauv lub Hoobkas ib zaug. Qhov zoo ntawm cov yeeb nkab ncaj yog qhov tswj tau, tab sis qhov patching qhov twg ob lub kav dej txuas yog lwm qhov teeb meem nkaus. Lub patching yuav tsum tau ua kom tiav ntawm qhov chaw los ntawm kev vuam cov yeeb nkab tiv thaiv sab nrauv, sib khi nrog cov ntaub nplaum kub hnyiab, thiab ua npuas ncauj rau ntawm qhov chaw, thiab cov kev tsim kho yog nyob deb ntawm cov neeg nyob hauv lub hoobkas. Nws feem ntau hais hauv kev lag luam tias "30% khoom, 70% kev tsim", thiab kev kho yog qhov nyuaj tshaj plaws ntawm cov "70%".
Qhov tsis ua tiav ntawm patching feem ntau pib los ntawm xoob sealing. Cov txheej txheem kho ib txwm muaj xws li peb kauj ruam: hluav taws xob cua sov fusion lub tes tsho vuam, cua sov shrink daim kab xev ci, thiab ntawm - qhov chaw foaming. Txawm hais tias lub tshav kub -shrinkable daim kab xev thiab PE txheej tiv thaiv lub raj tuaj yeem ua tau ruaj khov nyob ntawm seb puas muaj dej los yog roj stains ntawm qhov chaw, thiab seb qhov kub thiab lub sij hawm ci txaus. Yog hais tias lub qhov ncauj tsis huv los yog qhov ci tsis txaus, lub tshav kub -shrinkable daim kab xev yuav tsis nplaum. Thaum lub raj xa dej khiav, cov yeeb nkab steel ua haujlwm yuav thermally elongate, thiab txoj haujlwm sib txuas yuav yooj yim tawg, thiab cov dej hauv av yuav nkag mus rau hauv txheej rwb thaiv tsev raws cov kab nrib pleb. Qhov chaw txhaj tshuaj thiab qhov tso pa tawm kuj yog cov ntsiab lus tsis muaj zog. Yog tias qhov sealing tsis nyob hauv qhov chaw, dej yuav nkag mus.
Thaum cov dej hauv av nkag mus rau hauv lub patchwork, qhov teeb meem yuav phem zuj zus mus. Thaum polyurethane ua npuas ncauj los rau hauv kev sib cuag nrog dej, nws yuav raug hydrolysis, acidification, thiab carbonization nyob rau hauv ib tug siab -kub ib puag ncig. Lub zog ntawm cov txheej rwb thaiv tsev yuav txo qis, thiab cov nyhuv rwb thaiv tsev yuav txo qis heev. Tom qab cov txheej txheem tiv thaiv kev sib koom ua tsis tiav, cov dej hauv av tsim ib qho chaw kaw corrosive nyob rau hauv cov txheej txheem rwb thaiv tsev, thiab cov txheej txheem rwb thaiv tsev muaj kev tiv thaiv kev tiv thaiv cathodic tam sim no, thiab hauv zos corrosion yuav tshwm sim hauv cov yeeb nkab steel. Los ntawm qhov kev xav ntawm qhov tseeb engineering, qhov twg patching tsis ua haujlwm, qhov corrosion ntawm cov yeeb nkab steel feem ntau hnyav heev.
Kev kho cov teeb meem nrog patchwork yog kim heev. Lub raj xa dej tau muab faus. Txhawm rau kho qhov taw qhia patching, koj yuav tsum khawb txoj kev, rhuav tshem cov av, rov- thaj, thiab rov ua dua kom rov qab los. Tus nqi ntawm ib qho kev khawb thiab kho thaum muaj xwm txheej ceev- kev rhuav tshem txoj kev taug kev, kev ua haujlwm hauv av, kev ua haujlwm, cov khoom siv ntxiv rau kev poob cua sov- yog li ntawm kaum tawm txhiab mus rau ntau pua txhiab. Yog tias cov yeeb nkab steel tau corroded, nws yuav muaj teeb meem ntau dua los kho. Tsis muaj teeb meem zoo npaum li cas cov yeeb nkab rwb thaiv tsev yog tsim nyob rau hauv lub Hoobkas, yog tias qhov patching tsis khaws cia, tag nrho cov kav dej yuav pib rot ntawm cov pob qij txha. Kev kho yog cov hlab ntsha ntawm tag nrho cov kav dej.