1. Cov neeg ua haujlwm hauv kev tsim kho yuav tsum hnav cov khau tsis muaj kab mob lossis cov khau roj hmab thiab txwv tsis pub nkag mus rau ntawm cov khoom siv dov.
2. Tom qab tshem tawm cov ntawv sib cais, maj mam txhuam cov cement hmoov los yog xuab zeb hmoov rau ntawm yob kom yooj yim rau kev tsim kho.
3. Tom qab kev tsim kho kev sib koom ua ke, cov coil pob qij txha yuav tsum tau kuaj xyuas. Yog tias pom muaj kev puas tsuaj, nws yuav tsum tau kho raws sijhawm.
4. Thaum tying steel tuav los yog pouring qhob, yuav tsum tau them nyiaj mloog mus rau tiv thaiv cov waterproof txheej.
