This invention is a special integral shape designed to work as internal concrete formwork on the internal side of an access cover frame

摘要

#$%^&*AU2019101424A420200102.pdf#####Abstract The invention is a formwork integrally designed on the internal side of a cast iron access cover frame for encasing the frame with concrete. The external perimeter of the frame comprising of smaller ribs and refined patterns to allow large size concrete aggregate pass through most sections to avoid voids in the concrete encasement.DRAWINGS Figure 1 - standard cast iron frame section Fiure2-The in venonbuilt-in formworksection Figure 3 -in ven tion assembly