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Montarea si demontarea cofrajelor

de Dan Mazilu , 25 februarie 2010 , 103 afisari

In primul rand, transportul si depozitarea cofrajelor trebuie sa se faca cu mare atentie. Ele nu trebuie sa se deformeze, murdareasca, rugineasca si indoaie. Deci nu se depoziteaza direct pe pamant, iar pe stivele de cofraje nu se suprapun si alte materiale de constructii.

Pentru ca betonul sa nu se lipeasca de cofraj, acestea din urma se ung cu agenti de decofrare pe partea care vine in contact cu betonul. Acestea sunt substante speciale, care trebuie sa nu pateze betonul, sa nu corodeze cofrajul si betonul si sa se aplice usor.

In mare, montarea cofrajelor presupune trei operatii: trasarea pozitiei acestora, asamblarea si sustinerea lor provizorie, iar dupa verificarea pozitionarii urmeaza asamblarea, legarea si sprijinirea lor definitiva.

Starea solului trebuie analizata cu atentie. Daca este moale, exista riscul ca unele cofraje sa se deplaseze prin tasarea pamantului, iar acest lucru trebuie evitat.

Daca anumite bare din armatura sau alte piese metalice vor strapunge armatura (lucru relativ des intalnit pe santier), conturul acestora se va etansa, pentru a evita pierderea laptelui de ciment.

Decofrarea se va face in functie de rezistentele la care au ajuns partile de constructie din beton si sarcinile ce vor fi aplicate asupra acestora.

Sustinerile cofrajelor se desfac incepand din zona centrala a deschiderii elementelor si continuand, simetric, catre reazeme.

Daca se constata defecte de turnare (zone agregate sau, dimpotriva, goluri etc.), ce pot afecta stabilitatea constructiei, sa va opri demontarea elementelor de sustinere pana cand defectele vor fi remediate.

Atentie! Nu rupeti nici muchiile de beton, nici materialul cofrajelor si sustinerilor!


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