Cov yas PP hollow tsev formwork muaj lub zog siab, tiv taus kev cuam tshuam, tiv taus kev hnav, lub neej ntev, lub sijhawm tig tau ntau dua 100 zaug, kev siv tshuab zoo, thiab tuaj yeem siv nrog cov ntoo formwork tib lub sijhawm, cov formwork sib dua, yooj yim rau disassemble, muaj kev nyab xeeb thiab txhim khu kev qha. Cov laug cam pov tseg thiab cov khoom seem tuaj yeem rov ua dua tshiab tom qab tsim cov formwork, uas yog kom txuag tau tus nqi thiab txo cov pa phem. Tus nqi siv dav dav tuaj yeem txuag tau ntau dua 30% piv rau cov ntoo formwork ib txwm muaj.